CN111173731A

CN111173731A - Shaft seal-free magnetic drive hypocycloid gear pump

Info

Publication number: CN111173731A
Application number: CN202010090612.XA
Authority: CN
Inventors: 严际峰
Original assignee: Shanghai Jonsn Fluid Equipment Co ltd
Current assignee: Shanghai Jonsn Fluid Equipment Co ltd
Priority date: 2020-02-13
Filing date: 2020-02-13
Publication date: 2020-05-19

Abstract

The invention discloses a shaft seal-free magnetic drive hypocycloid gear pump which comprises a pump body with a pump cavity arranged inside, wherein one end of the pump body is fixedly connected with a pump cover covering the pump cavity. And a rotor shaft, an inner gear rotor and an outer gear rotor are sequentially arranged in the pump cavity from inside to outside. One end of the rotor shaft extends into the pump cover, and the other end of the rotor shaft extends out of the pump body and is connected with the driving connection assembly. The drive coupling assembling include with the drive casing of pump body connection, be equipped with the cage that is used for keeping apart the medium in the drive casing, be equipped with the suit in the cage interior magnet steel on the rotor shaft, the cage is equipped with outward magnetic drive that can with interior magnet steel magnetic force coupling outward. And one end of the external magnetic drive, which is far away from the pump body, is provided with a motor groove for connecting a motor. The gear pump provided by the invention avoids axial leakage of a medium, and ensures continuous and stable operation of the gear pump.

Description

Shaft seal-free magnetic drive hypocycloid gear pump

Technical Field

The invention relates to the field of gear pumps, in particular to a shaft seal-free magnetic drive hypocycloid gear pump.

Background

The hypocycloid gear pump has wide application in the field of aerospace, and is an important component of cooling systems of various aerospace craft and fuel metering systems of engines. The hypocycloid gear pump is composed of an inner gear rotor and an outer gear rotor, and the inner gear rotor is one less gear tooth than the outer gear rotor. When the internal gear rotor is in work, the internal gear rotor is connected with a motor, and under the driving of the motor, the internal gear rotor drives the external gear rotor to rotate around the axis of the external gear rotor. At the inlet of the pump, the gear teeth of the internal gear rotor and the external gear rotor are separated from each other to form negative pressure to suck liquid, at the outlet of the pump, the gear teeth of the internal gear rotor and the external gear rotor are continuously embedded and meshed to extrude and output the liquid, and the change of the volume between the gear teeth of the internal gear rotor and the gear teeth of the external gear rotor is circulated in sequence, so that the material suction and the material discharge can be realized once respectively.

The existing hypocycloid gear pump mostly adopts sealing structures such as lip seals and packing when being connected with a motor, the sealing structures can generate mechanical abrasion after being used for a long time, axial leakage is easy to occur when low-viscosity and high-pressure-difference media are conveyed, and continuous and stable work of the gear pump is influenced.

Disclosure of Invention

In order to overcome the defects, the invention aims to provide a shaft seal-free magnetic drive hypocycloid gear pump, which avoids axial leakage of a medium and ensures continuous and stable operation of the gear pump by improving the structure of the gear pump.

In order to achieve the above purposes, the invention adopts the technical scheme that: a shaft seal-free magnetic drive hypocycloid gear pump comprises a pump body with a pump cavity arranged inside, wherein one end of the pump body is fixedly connected with a pump cover covering the pump cavity. And a rotor shaft, an inner gear rotor and an outer gear rotor are sequentially arranged in the pump cavity from inside to outside. One end of the rotor shaft extends into the pump cover, and the other end of the rotor shaft extends out of the pump body and is connected with the driving connection assembly. The drive coupling assembling include with the drive casing of pump body connection, be equipped with the cage that is used for keeping apart the medium in the drive casing, be equipped with fixed suit in the cage interior magnet steel on the rotor shaft, the cage is equipped with outward magnetic drive that can with interior magnet steel magnetic force coupling outward. And one end of the external magnetic drive, which is far away from the pump body, is provided with a motor groove for connecting a motor.

When the motor is connected in the motor groove, the motor can drive the outer magnetic drive to rotate, magnetic coupling is formed between the outer magnetic drive and the inner magnetic steel, and the inner magnetic steel transmits the rotating motion to the inner gear rotor so as to drive the outer gear rotor to rotate.

The invention has the beneficial effects that: the power transmission is realized through the magnetic coupling of the external magnetic drive and the internal magnetic steel, so that the mechanical abrasion generated when all parts in the traditional gear pump are matched can be effectively reduced, and the service life of the gear pump is prolonged; the isolation cover is arranged between the outer magnetic drive and the inner magnetic steel, so that liquid can be shielded in the cover, the liquid is prevented from leaking to the motor through the outer magnetic drive, and the continuous and stable operation of the gear pump is ensured.

Further, the outer magnetic drive is located in the drive shell, and a clamping convex part matched with the drive shell is arranged on the outer wall of the outer magnetic drive. And one end of the outer magnetic drive close to the pump body is also provided with an isolation groove communicated with the motor groove, and the inner magnetic steel and the isolation cover are both positioned in the isolation groove. The outer magnetic drive can be fixed in the drive shell through the arrangement of the clamping convex part, and the inner magnetic steel and the isolation cover can be accommodated in the inner magnetic steel and the isolation cover through the arrangement of the isolation groove, so that the structure is more compact.

Further, the isolation cover comprises a circular cover bottom, and an annular cover wall formed integrally with the circular cover bottom is arranged on the periphery of the circular cover bottom. The annular cover wall is sleeved on the inner magnetic steel, and one end of the annular cover wall, which is far away from the circular cover bottom, extends out of the isolation groove to form an extension part which can be sleeved on the pump body. The liquid in the pump can be effectively prevented from leaking from the gap between the pump body and the driving shell through the arrangement of the extension part.

Further, a shield pressing plate which is pressed on the extending portion is further arranged between the pump body and the driving shell, and a first bolt hole through which a bolt penetrates is formed in the shield pressing plate. And a second bolt hole matched with the first bolt hole is formed in the driving shell. The extension part can be tightly pressed in the pump body through the arrangement of the isolation cover pressing plate, and the isolation cover pressing plate and the driving shell are connected through bolts conveniently through the arrangement of the first bolt hole and the second bolt hole.

Further, the extending part comprises an opening raised edge integrally formed with the annular cover wall, and a pressing groove for pressing the isolation cover pressing plate is formed in the outer side wall of the opening raised edge. The sealing performance of the isolation cover to the pump body is improved through the opening edge lifting, and the isolation cover pressing plate is limited through the pressing groove.

Further, the rotor shaft is coaxially disposed with an internal gear rotor, and the external gear rotor is eccentrically disposed with the internal gear rotor.

Furthermore, a rotating cavity for the rotation of the internal gear rotor is arranged in the external gear rotor, and a liquid inlet groove and a liquid outlet groove communicated with the rotating cavity are formed in the outer side of the rotating cavity. And the pump cover is provided with a liquid inlet hole communicated with the liquid inlet groove and a liquid outlet hole communicated with the liquid outlet groove.

Furthermore, a plurality of crescent arc tops are uniformly distributed on the inner side of the rotating cavity, and an arc tooth groove meshed with the internal gear rotor is formed between every two adjacent crescent arc tops.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic exploded view of an embodiment of the present invention;

FIG. 3 is a cut-away schematic view of an embodiment of the present invention;

FIG. 4 is a partial enlarged view of portion A of FIG. 3;

FIG. 5 is a schematic structural diagram of an external gear rotor according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a shielding case according to an embodiment of the invention.

In the figure:

1-a pump body; 2-pump cover; 21-liquid inlet hole; 22-liquid outlet holes; 3-a rotor shaft; 4-an internal gear rotor; 5-external gear rotor; 51-a rotation cavity; 511-crescent arc top; 512-arc tooth slot; 52-liquid inlet tank; 53-liquid outlet groove; 6-a drive housing; 61-bolt hole number two; 7-a shielding case; 71-circular cover bottom; 72-annular shield wall; 73-opening raised edge; 731-pressing groove; 8-internal magnetic steel; 9-external magnetic drive; 91-motor groove; 92-a snap-fit projection; 93-an isolation trench; 10-a shield cover pressing plate; 101-bolt hole number one.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.

Examples

Referring to the attached drawings 1-3, the shaft seal-free magnetic drive hypocycloid gear pump comprises a pump body 1 with a pump cavity arranged inside, and a pump cover 2 covering the pump cavity is fixedly connected to one end of the pump body 1. And a rotor shaft 3, an internal gear rotor 4 and an external gear rotor 5 are sequentially arranged in the pump cavity from inside to outside. One end of the rotor shaft 3 extends into the pump cover 2, and the other end extends out of the pump body 1 and is connected with the driving connection assembly. The drive coupling assembling include with the drive casing 6 that the pump body 1 is connected, be equipped with the cage 7 that is used for keeping apart the medium in the drive casing 6, be equipped with fixed suit in the cage 7 and be in interior magnet steel 8 on the rotor shaft 3, cage 7 is equipped with outward magnet outside can with interior magnet steel 8 magnetic coupling drives 9. And a motor groove 91 for connecting a motor is formed in one end, far away from the pump body 1, of the outer magnetic drive 9.

When the motor is connected in the motor groove 91, the motor can drive the outer magnetic drive 9 to rotate, magnetic coupling is formed between the outer magnetic drive 9 and the inner magnetic steel 8, the inner magnetic steel 8 transmits the rotating motion to the inner gear rotor 4, and then the outer gear rotor 5 is driven to rotate. The power transmission is realized through the magnetic coupling of the outer magnetic drive 9 and the inner magnetic steel 8, the mechanical abrasion generated when all parts in the traditional gear pump are matched can be effectively reduced, and the service life of the gear pump is prolonged. The isolation cover 7 is arranged between the outer magnetic drive 9 and the inner magnetic steel 8, so that liquid can be shielded in the cover, the liquid is prevented from leaking into the motor through the outer magnetic drive 9, and the continuous and stable operation of the gear pump is guaranteed.

Specifically, the outer magnetic driver 9 is located in the driving housing 6, and an engaging protrusion 92 matched with the driving housing 6 is provided on an outer wall thereof. An isolation groove 93 communicated with the motor groove 91 is further formed in one end, close to the pump body 1, of the outer magnetic drive 9, and the inner magnetic steel 8 and the isolation cover 7 are located in the isolation groove 93. Referring to fig. 6, the isolation cover 7 includes a circular cover bottom 71, and an annular cover wall 72 integrally formed with the circular cover bottom 71 is provided on the outer periphery of the circular cover bottom 71. The annular cover wall 72 and the circular cover bottom 71 define a containing area for containing the inner magnetic steel 8. One end of the annular cover wall 72, which is far away from the circular cover bottom 71, extends out of the isolation groove 93 and forms an extension part which can be sleeved on the pump body 1. The annular cover wall 72 and the circular cover bottom 71 are arranged to realize the isolation of the outer magnetic drive 9 and the inner magnetic steel 8, and the leakage of liquid in the pump from the gap between the pump body 1 and the drive shell 6 can be effectively avoided through the arrangement of the extension parts.

In order to improve the stability of the extension, a barrier cover pressure plate 10 is also provided between the pump body 1 and the drive housing 6, as shown in fig. 3-4, which presses against the extension. The extending part comprises an opening raised edge 73 which is integrally formed with the annular cover wall 72, and a pressing groove 731 for pressing the isolation cover pressing plate 10 is arranged on the outer side wall of the opening raised edge 73. The extending part can be tightly pressed in the pump body 1 through the arrangement of the isolation cover pressing plate 10, the sealing performance of the isolation cover 7 on the pump body 1 is improved through the arrangement of the opening raised edge 73, and the isolation cover pressing plate 10 is limited through the arrangement of the pressing groove 731.

The insulation cover pressing plate 10 is further provided with a first bolt hole 101 for a bolt to pass through. And a second bolt hole 61 matched with the first bolt hole 101 is formed in the driving shell 6. The arrangement of the first bolt holes 101 and the second bolt holes 61 facilitates the connection of the isolation cover pressing plate 10 and the driving shell 6 through bolts.

The rotor shaft 3 and the internal gear rotor 4 are coaxially arranged, and the external gear rotor 5 and the internal gear rotor 4 are eccentrically arranged. Referring to fig. 5, a rotation cavity 51 for rotating the internal gear rotor 4 is provided in the external gear rotor 5, and a liquid inlet tank 52 and a liquid outlet tank 53 communicated with the rotation cavity 51 are provided outside the rotation cavity 51. The pump cover 2 is provided with a liquid inlet hole 21 communicated with the liquid inlet groove 52 and a liquid outlet hole 22 communicated with the liquid outlet groove 53. A plurality of crescent arc tops 511 are uniformly distributed on the inner side of the rotating cavity 51, and an arc tooth socket 512 meshed with the internal gear rotor 4 is arranged between every two adjacent crescent arc tops 511. In operation, liquid in the liquid inlet hole 21 enters the rotating cavity 51 through the liquid inlet slot 52 and is discharged from the liquid outlet hole 22 through the liquid outlet slot 53.

The outer gear rotor 5 is made of powder metallurgy and PEEK graphite-containing high polymer materials, and the inner gear rotor 4 is made of powder metallurgy technology, ceramics and PEEK graphite-containing high polymer materials.

The above embodiments are merely illustrative of the technical concept and features of the present invention, and the present invention is not limited thereto, and any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.

Claims

1. A shaft seal-free magnetic drive hypocycloid gear pump comprises a pump body (1) with a pump cavity arranged inside, wherein one end of the pump body (1) is fixedly connected with a pump cover (2) covered on the pump cavity; a rotor shaft (3), an internal gear rotor (4) and an external gear rotor (5) are sequentially arranged in the pump cavity from inside to outside; the method is characterized in that: one end of the rotor shaft (3) extends into the pump cover (2), and the other end of the rotor shaft extends out of the pump body (1) and is connected with the driving connecting assembly; the driving connection assembly comprises a driving shell (6) connected with the pump body (1), an isolation cover (7) used for isolating media is arranged in the driving shell (6), an inner magnetic steel (8) fixedly sleeved on the rotor shaft (3) is arranged in the isolation cover (7), and an outer magnetic drive (9) capable of being magnetically coupled with the inner magnetic steel (8) is arranged outside the isolation cover (7); and a motor groove (91) used for connecting a motor is formed in one end, far away from the pump body (1), of the outer magnetic drive (9).

2. The gear pump of claim 1, wherein: the outer magnetic drive (9) is positioned in the drive shell (6), and a clamping convex part (92) matched with the drive shell (6) is arranged on the outer wall of the outer magnetic drive; an isolation groove (93) communicated with the motor groove (91) is further formed in one end, close to the pump body (1), of the outer magnetic drive (9), and the inner magnetic steel (8) and the isolation cover (7) are located in the isolation groove (93).

3. The gear pump of claim 1, wherein: the isolation cover (7) comprises a circular cover bottom (71), and an annular cover wall (72) integrally formed with the circular cover bottom (71) is arranged on the periphery of the circular cover bottom (71); the annular cover wall (72) is sleeved on the inner magnetic steel (8), and one end of the annular cover wall, which is far away from the circular cover bottom (71), extends out of the isolation groove (93) to form an extension part which can be sleeved on the pump body (1).

4. The gear pump of claim 3, wherein: a separation cover pressing plate (10) pressed on the extending part is further arranged between the pump body (1) and the driving shell (6), and a first bolt hole (101) for a bolt to pass through is formed in the separation cover pressing plate (10); and a second bolt hole (61) matched with the first bolt hole (101) is formed in the driving shell (6).

5. The gear pump of claim 4, wherein: the extension part comprises an opening raised edge (73) which is integrally formed with the annular cover wall (72), and a pressing groove (731) for pressing the isolation cover pressing plate (10) is formed in the outer side wall of the opening raised edge (73).

6. Gear pump according to any of claims 1 to 5, characterized in that: the rotor shaft (3) and the internal gear rotor (4) are coaxially arranged, and the external gear rotor (5) and the internal gear rotor (4) are eccentrically arranged.

7. The gear pump of claim 6, wherein: a rotating cavity (51) for the rotation of the internal gear rotor (4) is arranged in the external gear rotor (5), and a liquid inlet groove (52) and a liquid outlet groove (53) which are communicated with the rotating cavity (51) are arranged on the outer side of the rotating cavity (51); the pump cover (2) is provided with a liquid inlet hole (21) communicated with the liquid inlet groove (52) and a liquid outlet hole (22) communicated with the liquid outlet groove (53).

8. The gear pump of claim 7, wherein: a plurality of crescent arc tops (511) are uniformly distributed on the inner side of the rotating cavity (51), and arc tooth grooves (512) meshed with the internal gear rotor (4) are formed between every two adjacent crescent arc tops (511).