CN213116681U

CN213116681U - Inner engaged gear pump with balanced radial force

Info

Publication number: CN213116681U
Application number: CN202021401595.9U
Authority: CN
Inventors: 邵星
Original assignee: Wuxi Dongye Machinery Manufacturing Co ltd
Current assignee: Wuxi Dongye Machinery Manufacturing Co ltd
Priority date: 2020-07-16
Filing date: 2020-07-16
Publication date: 2021-05-04
Anticipated expiration: 2030-07-16

Abstract

The utility model discloses a balanced crescent gear pump of radial force belongs to the relevant technical field of gear pump. The flexible annular gear and the separation block divide the working cavity into an oil suction area and an oil pressing area, a driving gear which is rotatably sleeved on the driving shaft is arranged in the front cover, a driven gear which is sleeved on the driven shaft is arranged in the front cover, a transmission gear which is in contact and meshed with the driving gear and the driven gear is further arranged in the front cover, a first confluence channel which is communicated with the oil pressing area correspondingly is arranged in the front cover, and a second confluence channel which is communicated with the oil suction area correspondingly is arranged in the rear cover. The utility model discloses balanced crescent gear pump of radial force has reduced the unbalanced influence to gear pump life-span loss of radial force effectively.

Description

Inner engaged gear pump with balanced radial force

Technical Field

The utility model relates to a gear pump correlation technique field, concretely relates to balanced crescent gear pump of radial force.

Background

The inner engaged gear pump adopts the principle of gear inner engagement, the pitch circle of the inner gear and the pitch circle of the outer gear are close to one side, and the other side is separated by a crescent plate on the pump cover. The driving gear on the driving shaft drives the inner gear and the driving gear to rotate in the same direction, the gears are separated from each other at the inlet to form negative pressure to suck liquid, and the gears are continuously embedded and meshed at the outlet to extrude and output the liquid. When an existing internal gear pump works, the pressure of a pressure oil area is higher than the pressure of an oil absorption area to generate radial unbalanced force, when the radial unbalanced force is too large, a pump shaft can be bent, the radial unbalanced force can enable the inner gear ring and the inner wall of a shell to be in excessive contact, so that the abrasion of a contact surface is aggravated, the abrasion of a bearing can be accelerated at the same time, and the service life of the gear pump is influenced.

There is a need to provide a radial force balanced gerotor pump that addresses the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem who solves: the inner engaged gear pump with balanced radial force is provided, and the influence of unbalanced radial force on the service life loss of the gear pump is effectively reduced.

In order to solve the technical problem, the utility model discloses a as follows technical scheme be: a radial force balanced gerotor pump; the internal gear pump comprises a shell, a front cover and a rear cover which are arranged at two ends of the shell, a first gear and a second gear which are rotatably arranged in the shell, a flexible inner gear ring and a separation block which is arranged between the first gear and the second gear, wherein a working cavity is formed in the shell in a hollow mode, the internal gear pump also comprises a driving shaft which is fixed on the first gear and a driven shaft which is fixed on the second gear, two ends of the driving shaft and two ends of the driven shaft are respectively inserted into the front cover and the rear cover, the flexible inner gear ring is attached to the inner side wall of the shell and sleeved on the first gear and the second gear, the flexible inner gear ring is meshed with the first gear and the second gear together, the first gear, the second gear, the flexible inner gear ring and the separation block divide the working cavity into an oil suction area and an oil pressing area, an oil outlet is arranged on the outer end surface of the front cover, and a driving, the inside of protecgulum still is equipped with the driven gear that the cover was established on the driven shaft, and still be equipped with in the protecgulum with driving gear and driven gear equal contact engagement's drive gear, the inside of protecgulum is equipped with and presses the communicating first passageway that converges of oil zone correspondence to the one end of first passageway that converges is handed in the oil-out, be equipped with the oil inlet on the outer terminal surface of back lid, the inside of back lid is equipped with and inhales the communicating second passageway that converges that the oil zone corresponds to the one end of second passageway that converges is handed in the oil inlet.

Further, the first gear and the second gear are the same in size and shape.

Further, the cross section of the working cavity is elliptical.

Furthermore, the flexible inner gear ring is made of a wire core rubber material.

Furthermore, convex surfaces which are attached to the flexible inner gear ring are symmetrically arranged on the separating block corresponding to the two sides of the flexible inner gear ring, and concave surfaces which are attached to the first gear and the second gear respectively are symmetrically arranged on the separating block corresponding to the two sides of the first gear and the second gear.

Furthermore, the driving gear and the driven gear are the same in size and shape.

Furthermore, the oil suction area and the oil pressing area are respectively provided with two oil suction areas and are distributed in a cross mode, the corresponding first confluence passages are provided with two oil pressing areas and are respectively communicated with the two oil pressing areas correspondingly, and the first confluence passages are also provided with two oil suction areas and are respectively communicated with the two oil suction areas correspondingly.

The utility model has the beneficial technical effects that: the utility model relates to a balanced crescent gear pump of radial force, by two first gears, the flexible ring gear of second gear and separation piece separate into two oil absorption district and two oil pressing district with the working chamber of casing, when having guaranteed medium conveying capacity, the area of action of pressure liquid to the gear has been reduced again, share radial unbalanced force through first gear and second gear promptly, simultaneously owing to adopt flexible ring gear as the ring gear, can cushion absorption to partly radial force, further reduce the pressure between flexible ring gear and the casing inside wall, friction loss between each other has been reduced promptly.

Drawings

The present invention will be further explained with reference to the drawings and examples.

In the figure: fig. 1 is a schematic view of the internal structure of the radial force balanced crescent gear pump of the present invention;

FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1;

FIG. 3 is a structural diagram of a front cover and a rear cover of the balanced radial force crescent gear pump of the present invention;

FIG. 4 is a cross-sectional view of the front cover and the rear cover of FIG. 3;

FIG. 5 is a left side view of the front cover of FIG. 3;

FIG. 6 is a cross-sectional view taken along the line B-B in FIG. 5;

FIG. 7 is a rear side view of the rear cover of FIG. 3;

FIG. 8 is a cross-sectional view taken along the line E-E in FIG. 7;

in the figure:

1. a housing; 101. a working chamber; 102. an oil absorption area; 103. pressing an oil area; 2. a front cover; 201. an oil outlet; 202. a first bus duct; 203. a first gear chamber; 2031. a driving gear; 204. a second gear chamber; 2041. a transmission gear; 205. a third gear chamber; 2051. a driven gear; 3. a rear cover; 301. an oil inlet; 302. a second bus duct; 4. a first gear; 5. a second gear; 6. a flexible inner gear ring; 7. a separation block; 701. a convex surface; 702. a concave surface; 8. a drive shaft; 9. a driven shaft.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the present application, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 and 2, the radial force balanced internal gear pump includes a housing 1, a first gear 4, a second gear 5, and a flexible internal gear 6, wherein the first gear 4 and the second gear 5 are rotatably disposed in the housing 1, the flexible internal gear 6 is sleeved on the first gear 4 and the second gear 5 and is engaged with both the first gear 4 and the second gear 5, when the internal gear pump works, an oil suction area 102 is formed in an area where the gears are disengaged from the flexible internal gear 6 to suck hydraulic oil, and an oil suction area 103 is formed in an area where the gears and the flexible internal gear 6 tend to be engaged to discharge hydraulic oil.

As shown in fig. 1, the radial force balanced internal gear pump of the present embodiment further includes a front cover 2 fixedly mounted on one end of the housing 1, a rear cover 3 fixedly mounted on the other end of the housing 1, a spacer 7 provided between the first gear 4 and the second gear 5, a drive shaft 8 inserted and fixed in the central axis of the first gear 4, and a driven shaft 9 inserted and fixed in the central axis of the second gear 5.

More specifically, the interior of the housing 1 is hollow to form a working chamber 101, and in the present embodiment, the cross section of the working chamber 101 is elliptical.

The first gear 4 and the second gear 5 with the same size are symmetrically arranged in the shell 1 and are spaced from each other, in order to realize the rotary connection of the first gear 4 and the second gear 5, one end of a driving shaft 8 corresponding to the first gear 4 is rotatably inserted on the rear cover 3, and the other end of the driving shaft 8 is rotatably inserted on the front cover 2 and penetrates through the front cover 2; both ends of the driven shaft 9 are rotatably inserted in the front cover 2 and the rear cover 3, respectively.

The flexible inner gear ring 6 is attached to the inner side wall of the shell 1 in a sliding mode and sleeved on the first gear 4 and the second gear 5, one side, opposite to the first gear 4 and the second gear 5, of the first gear 4 is correspondingly meshed with the flexible inner gear ring 6, the flexible inner gear ring 6 is made of a wire core rubber material in the embodiment, and in other embodiments which are not shown, the flexible inner gear ring 6 can also be made of a high-strength flexible composite material.

The separating block 7 is fixedly installed inside the shell 1 by connecting two ends with the front cover 2 and the rear cover 3, the separating block 7 is positioned between the first gear 4 and the second gear 5, convex surfaces 701 which are attached to the flexible inner gear 6 are symmetrically arranged on the separating block 7 corresponding to two side positions of the flexible inner gear 6, concave surfaces 702 which are attached to the first gear 4 and the second gear 5 are symmetrically arranged on the separating block 7 corresponding to two side positions of the first gear 4 and the second gear 5, respectively, so that the inner cavity of the shell 1 is divided into two oil suction areas 102 and two oil pressing areas 103 by the separating block 7, and because the rotating directions of the first gear 4 and the second gear 5 are opposite, an oil suction area 102 is arranged in an area where the first gear 4 is disengaged from the flexible inner gear 6 and an area where the second gear 5 is disengaged from the flexible inner gear 6, and an area where the first gear 4 is engaged with the flexible inner gear 6 and an area where the second gear 5 is engaged with the flexible inner gear 6 are oil pressing areas 103 Therefore, the two oil suction areas 102 and the two oil pressing areas 103 are crossed.

An oil outlet 201 is arranged on the outer end surface of the front cover 2 facing away from the housing 1, a first gear cavity 203 and a third gear cavity 205 are respectively arranged in the front cover 2 corresponding to the driving shaft 8 and the driven shaft 9, a second gear cavity 204 is further arranged in the front cover 2 and between the first gear cavity 203 and the third gear cavity 205, a driving gear 2031 fixed on the driving shaft 8 in a sleeved manner is arranged in the first gear cavity 203, a driven gear 2051 fixed on the driven shaft 9 in a sleeved manner is arranged in the third gear cavity 205, the driving gear 2031 and the driven gear 2051 are the same in size, a transmission gear 2041 is rotatably arranged in the second gear cavity 204, the transmission gear 2041 is in contact with and meshed with the driving gear 2031 and the driven gear 2051, so as to realize transmission connection between the driving shaft 8 and the driven shaft 9, and referring to fig. 5 and 6, two first pressure oil confluence passages 202 corresponding to the two pressure oil zones 103 are arranged in the front cover 2, and two first confluence passages 202 are communicated with the oil outlet 201 at one end of the first confluence passages 202, which is opposite to the shell 1, so that the oil pressing area 103 is communicated with the oil outlet 201 through the first confluence passages 202.

Referring to fig. 7 and 8, an oil inlet 301 is provided on an outer end surface of the rear cover 3 facing away from the housing 1, two second converging channels 302 are provided inside the rear cover 3 and are communicated with the two oil suction areas 102, and one ends of the two second converging channels 302 facing away from the housing 1 are communicated with the oil inlet 301, so that the oil suction areas 102 are communicated with the oil inlet 301 through the second converging channels 302.

The working process of the radial force balanced internal gear pump of the present invention is described below with reference to the accompanying drawings:

referring to fig. 1 and 2, the outermost end of the driving shaft 8 is in transmission connection with a driving body (e.g. a motor), so as to drive the driving shaft 8 to rotate counterclockwise in fig. 2, and thus the driving gear 2031 finally drives the driven gear 2051 to rotate counterclockwise, the driven gear 2051 rotates to transmit torque to the driven shaft 9 to drive the driven shaft 9 to rotate in the counterclockwise direction, and finally the first gear 4 and the second gear 5 rotate synchronously in the counterclockwise direction, and further drive the externally meshed flexible ring gear 6 to rotate counterclockwise, the gears of the oil absorption areas 102 gradually disengage, the volume of the space of the oil absorption area 102 increases from small to large to generate negative pressure, so as to drive liquid from the oil inlet 301 to enter the two oil absorption areas 102 through the second confluence channel 302, the liquid in the oil absorption area 102 fills the space between the two teeth, and along with the rotation of the first gear 4, the second gear 5 and the flexible ring gear 6 along the separation block 7, therefore, the liquid in the oil suction area 102 is continuously conveyed to the oil pressing area 103, the teeth in the oil pressing area 103 tend to mesh, so that the space volume of the oil pressing area 103 is reduced to form high pressure, the liquid in the oil pressing area 103 is forced to flow to the oil outlet 201 through the first confluence channel 202, and the liquid is conveyed.

The oil suction area and the oil pressing area are divided into two oil suction areas 102 and two oil pressing areas 103, the action area of pressure liquid on the gears is reduced while the medium conveying amount is ensured, namely the first gear 4 and the second gear 5 share radial unbalanced force, and meanwhile, the flexible inner gear ring 6 is used as the inner gear ring, so that a part of radial force can be buffered and absorbed, and the friction loss between the flexible inner gear ring 6 and the inner side wall of the shell 1 is further reduced.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A balanced radial force crescent gear pump characterized in that: the internal gear pump comprises a shell (1), a front cover (2) and a rear cover (3) which are arranged at two ends of the shell (1), a first gear (4) and a second gear (5) which are rotatably arranged in the shell (1), a flexible inner gear ring (6) and a separating block (7) which is arranged between the first gear (4) and the second gear (5), wherein the interior of the shell (1) is hollow to form a working cavity (101), the internal gear pump also comprises a driving shaft (8) which is fixed on the first gear (4) and a driven shaft (9) which is fixed on the second gear (5), two ends of the driving shaft (8) and the driven shaft (9) are respectively inserted on the front cover (2) and the rear cover (3), the flexible inner gear ring (6) is attached to the inner side wall of the shell (1) and sleeved on the first gear (4) and the second gear (5), and the flexible inner gear ring (6) is jointly meshed with the first gear (4) and the second gear (5), the working cavity (101) is divided into an oil suction area (102) and an oil pressing area (103) by the first gear (4), the second gear (5), the flexible inner gear ring (6) and the separating block (7), an oil outlet (201) is formed in the outer end face of the front cover (2), a driving gear (2031) which is rotatably sleeved on the driving shaft (8) is arranged in the front cover (2), a driven gear (2051) which is sleeved on the driven shaft (9) is further arranged in the front cover (2), a transmission gear (2041) which is in contact and meshing with the driving gear (2031) and the driven gear (2051) is further arranged in the front cover (2), a first confluence channel (202) which is correspondingly communicated with the oil pressing area (103) is arranged in the front cover (2), one end of the first confluence channel (202) is crossed with the oil outlet (201), an oil inlet (301) is formed in the outer end face of the rear cover (3), and a second confluence channel (302) correspondingly communicated with the oil suction area (102) is arranged in the rear cover (3), and one end of the second confluence channel (302) is communicated with the oil inlet (301).

2. A radial force balanced crescent gear pump according to claim 1, wherein: the first gear (4) and the second gear (5) are the same in size and shape.

3. A radial force balanced crescent gear pump according to claim 1, wherein: the cross section of the working cavity (101) is elliptical.

4. A radial force balanced crescent gear pump according to claim 1, wherein: the flexible inner gear ring (6) is made of a wire core rubber material.

5. A radial force balanced crescent gear pump according to claim 1, wherein: convex surfaces (701) which are attached to the flexible inner gear ring (6) are symmetrically arranged on the separating block (7) corresponding to the two sides of the flexible inner gear ring (6), and concave surfaces (702) which are attached to the first gear (4) and the second gear (5) respectively are symmetrically arranged on the separating block (7) corresponding to the two sides of the first gear (4) and the second gear (5).

6. A radial force balanced crescent gear pump according to claim 1, wherein: the driving gear (2031) and the driven gear (2051) are the same in size and shape.

7. A radial force balanced crescent gear pump according to claim 1, wherein: the oil suction area (102) and the oil pressing area (103) are respectively provided with two oil suction areas and distributed in a cross mode, the corresponding first confluence channel (202) is provided with two oil pressing areas and is respectively communicated with the two oil pressing areas (103), and the first confluence channel (202) is also provided with two oil suction areas and is respectively communicated with the two oil suction areas (102).