CN214998185U

CN214998185U - Internal gear pump

Info

Publication number: CN214998185U
Application number: CN202023271444.9U
Authority: CN
Inventors: 吴国伟; 张振廷
Original assignee: Nanjing Weifu Jinning Co ltd
Current assignee: Nanjing Weifu Jinning Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-12-03
Anticipated expiration: 2030-12-30

Abstract

The utility model discloses an internal gear pump, including the protecgulum, midbody and hou gai, be equipped with the ring gear in the midbody inboard, ring gear and gear shaft meshing, be equipped with O type circle and preceding axial clearance compensation mechanism between protecgulum and midbody, the coaxial line is equipped with oil inlet and oil-out on the midbody, clearance between midbody and protecgulum and the hou gai has formed the pump chamber low-pressure zone, the oil feed tank is enclosed by midbody and ring gear, be equipped with low-pressure zone and high nip between gear shaft and ring gear, the hole on the ring gear is passed through to the high nip, pump body high pressure chamber groove, oil outlet duct and oil-out intercommunication, the hole on the ring gear is passed through to the low-pressure zone, pump chamber low-pressure zone, oil feed tank and oil inlet intercommunication, be equipped with O type circle and back axial clearance compensation mechanism between midbody and hou gai. The utility model has the advantages of simple structure and reasonable design, can reduce manufacturing cost, be convenient for install, and the total weight of the pump body is light.

Description

Internal gear pump

Technical Field

The utility model relates to a high-pressure hydraulic pump, specific crescent gear pump that says so for fork truck.

Background

The existing internal gear pump shell consists of 5 parts, namely a connecting disc 1, a front cover 2, a middle body 3, a rear cover 4 and an end cover 5. And the oil inlet and outlet is designed on the intermediate body 3, and the axis of the oil inlet and outlet forms an included angle of 90 degrees.

1. The shell of the structure has a plurality of parts, and needs to be machined, so that the machining cost is high.

2. The oil inlet and outlet 90-degree included angle is formed, and the forklift is compact in structure and inconvenient to mount on the forklift.

Disclosure of Invention

In order to solve the problem, the utility model provides a be convenient for install, and can reduce the crescent gear pump of pump body total weight.

In order to achieve the purpose, the utility model discloses a realize through following technical scheme:

the utility model relates to an internal gear pump, including adopting the forged aluminum material to make and the protecgulum that connects gradually, midbody and hou gai, be provided with the flange on the protecgulum, be provided with the bolt hole with flange fixed mounting on the midbody, the midbody passes through bolt fastening with the hou gai, be provided with the ring gear in the midbody inboard, every tooth portion of recessing at the ring gear all sets up porosely, ring gear and gear shaft meshing, be provided with O type circle and preceding axial clearance compensation mechanism between protecgulum and midbody, sealed pad and preceding plastic pad set up between preceding axial compensation board and protecgulum, coaxial line is provided with oil inlet and oil-out on the midbody, clearance between midbody and protecgulum and the hou gai has formed pump chamber low-pressure area, the oil feed tank is enclosed by midbody and ring gear, be provided with low-pressure area and high-pressure area between gear shaft and ring gear, the high-pressure area passes through the hole on the ring gear, the pump body high-pressure chamber groove, The oil outlet duct is communicated with the oil outlet, the low-pressure area is communicated with the oil inlet through a hole in the gear ring, the pump cavity low-pressure area and the oil inlet groove, and an O-shaped ring and a rear axial clearance compensation mechanism are arranged between the intermediate body and the rear cover.

The utility model discloses a further improvement lies in: the front cover is embedded with a shaft sleeve for supporting the gear shaft and an installation spigot which is coaxial with the gear shaft.

The utility model discloses a further improvement lies in: an oil distribution disc, an oil distribution disc frame and a stop pin are further arranged between the gear shaft and the gear ring, and a sealing rod, a small spring piece and a large spring piece are arranged between the oil distribution disc and the oil distribution disc frame.

The utility model discloses a further improvement lies in: the intermediate body is provided with three pump cavity low-pressure areas, two pump body high-pressure cavity grooves are uniformly distributed among the three pump cavity low-pressure areas, each pump body high-pressure cavity groove is provided with an oil outlet channel communicated with an oil outlet, and the upper side and the lower side of each pump body high-pressure cavity groove are provided with supporting surfaces.

The utility model discloses a further improvement lies in: the front axial clearance compensation mechanism comprises a sealing gasket, a front axial compensation plate and a front plastic gasket, and the sealing gasket and the front plastic gasket are arranged between the front axial compensation plate and the front cover.

The utility model discloses a further improvement lies in: the rear axial clearance compensation mechanism comprises a rear axial compensation plate, a rear plastic pad and a sealing pad, and the rear plastic pad and the sealing pad are arranged on the rear side of the rear axial compensation plate.

The utility model discloses a further improvement lies in: and sealing rings are arranged between the rear plastic pad and the rear cover and between the front plastic pad and the front cover.

The utility model discloses a further improvement lies in: the front cover and the rear cover are respectively provided with a shaft sleeve mounting hole, a stop pin mounting hole and a high-pressure cavity.

The utility model discloses a further improvement lies in: a framework oil seal and a check ring for holes are arranged between the gear shaft and the front cover.

The utility model discloses a further improvement lies in: the aperture of the oil inlet is larger than or equal to 35mm, the axis of the oil inlet is deviated to the meshing position of the gear shaft and the gear ring, and the linear distance between the axis of the oil inlet and the axis of the gear shaft is L.

The utility model has the advantages that: the casing of the pump body is changed into 3 part components from 5 traditional parts, so that the number of parts is reduced, the processing amount is reduced, and the manufacturing cost is reduced. And the pump body adopts forged aluminum material to make, is favorable to reducing the total weight of whole pump body, and the axis setting of oil inlet and oil-out is on same straight line, and the fork truck of being convenient for uses the installation. And the aperture of the oil inlet is more than or equal to 35mm, the highest use rotating speed of the hydraulic pump can be improved, the hydraulic pump can normally work when the high rotating speed is ensured, and cavitation is not generated.

The utility model has the advantages of simple structure and reasonable design, can reduce manufacturing cost, be convenient for install, and the total weight of the pump body is light.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a cross-sectional view of the present invention.

Fig. 3 is another cross-sectional view of the present invention.

FIG. 4 is a schematic illustration of an intermediate portion.

Fig. 5 is a schematic view of the rear cover.

FIG. 6 is a schematic view of a prior art hydraulic pump.

FIG. 7 is a cross-sectional view of a prior art hydraulic pump.

Wherein: 1-front cover, 2-intermediate body, 2-1-oil inlet, 2-2-oil inlet tank, 2-3-pump chamber low-pressure region, 2-4-pump body high-pressure chamber tank, 2-5-oil outlet channel, 2-6-oil outlet, 3-rear cover, 4-bolt, 5-O-ring, 6-sealing gasket, 7-rear plastic pad, 8-rear axial compensation plate, 9-gear shaft, 10-gear ring, 10-1-hole, 11-front axial compensation plate, 12-front plastic pad, 13-skeleton oil seal, 14-hole retainer ring, 15-stopper pin, 16-oil distribution plate rack, 17-oil distribution plate, 18-sealing rod, 19-small spring piece, 20-large spring piece, 21-low pressure region, 22-high pressure region.

Detailed Description

In order to enhance the understanding of the present invention, the following detailed description of the present invention will be made with reference to the accompanying drawings and examples, which are only used for explaining the present invention and do not limit the scope of the present invention.

As shown in figures 1-5, the utility model relates to an internal gear pump, which comprises a front cover 1, a middle body 2 and a rear cover 3 which are made of forged aluminum materials and are connected in sequence, the total weight of the whole hydraulic pump can be reduced by adopting the forged aluminum materials, a flange is arranged on the front cover 1, a bolt hole fixedly arranged with the flange is arranged on the middle body 2, the middle body 2 and the rear cover 3 are fixed by a bolt 4, a gear ring 10 is arranged on the inner side of the middle body 2, each concave tooth part of the gear ring 10 is provided with a hole 10-1, the gear ring 10 is meshed with a gear shaft 9, an O-shaped ring 5 and a front axial clearance compensation mechanism are arranged between the front cover 1 and the middle body 2, the front axial clearance compensation mechanism comprises a sealing gasket 6, a front axial compensation plate 11 and a front plastic pad 12, the sealing gasket 6 and the front plastic pad 12 are arranged between the front axial compensation plate 11 and the front cover 1, an oil inlet 2-1 and an oil outlet 2-6 are coaxially arranged on the middle body 2, the oil inlet 2-1 and the oil outlet 2-6 are distributed at 180 degrees, namely, the central lines of the oil inlet 2-1 and the oil outlet 2-6 are positioned on the same straight line, so that the installation is convenient, the aperture of the oil inlet 2-1 is larger than or equal to 35mm, the oil inlet throttling is small in the whole rotating speed range of the forklift, the oil pump is guaranteed not to generate cavitation erosion when the oil pump runs at high speed, the axis of the oil inlet is deviated to the meshing position of the gear shaft 9 and the gear ring 10, the linear distance between the axis of the oil inlet 2-1 and the axis of the gear shaft 9 is L, the optimal length of the L is 16mm, and the oil inlet and the oil outlet are directed at the gear meshing area, so that hydraulic oil flows more smoothly in the pump. The clearance between the intermediate body 2 and the front cover 1 and the rear cover 3 forms a pump cavity low-pressure area 2-3, the oil inlet tank 2-2 is enclosed by the intermediate body 2 and the gear ring 10, a low pressure area 21 and a high pressure area 22 are arranged between the gear shaft 9 and the gear ring 10, the high pressure area 22 is communicated with the oil outlet 2-6 through a hole 10-1 on the gear ring 10, a high pressure cavity groove 2-4 of the pump body, an oil outlet passage 2-5 and an oil outlet, the low pressure area 21 is communicated with the oil inlet 2-1 through a hole 10-1 on the gear ring 10, a low pressure area 2-3 of the pump cavity, an oil inlet groove 2-2 and an oil inlet 2-1, an O-shaped ring 5 and a rear axial clearance compensation mechanism are arranged between the intermediate body 2 and the rear cover 3, the rear axial clearance compensation mechanism comprises a rear axial compensation plate 8, a rear plastic pad 7 and a sealing pad 6, and the rear plastic pad 7 and the sealing pad 6 are arranged on the rear side of the rear axial compensation plate 8.

A shaft sleeve for supporting the gear shaft 9 and an installation spigot which is coaxial with the gear shaft 9 are embedded on the front cover 1. An oil distribution disc 17, an oil distribution disc rack 16 and a stop pin 15 are further arranged between the gear shaft 9 and the gear ring 10, and a seal rod 18, a small spring piece 19 and a large spring piece 20 are arranged between the oil distribution disc 17 and the oil distribution disc rack 16. The middle body 2 is provided with three pump cavity low-pressure areas 2-3, two pump body high-pressure cavity grooves 2-4 are uniformly distributed among the three pump cavity low-pressure areas 2-3, each pump body high-pressure cavity groove 2-4 is provided with an oil outlet passage 2-5 communicated with an oil outlet 2-6, and the upper side and the lower side of each pump body high-pressure cavity groove 2-4 are provided with supporting surfaces.

Sealing gaskets 6 are arranged between the rear plastic cushion 7 and the rear cover 3 and between the front plastic cushion 12 and the front cover 1. The front cover 1 and the rear cover 3 are respectively provided with a shaft sleeve mounting hole, a stop pin mounting hole and a high-pressure cavity. A skeleton oil seal 13 and a hole retainer 14 are provided between the gear shaft and the front cover.

The oil inlet 2-1 and the oil outlet 2-6 are arranged on the intermediate body 2, the axes of the oil inlet 2-1 and the oil outlet 2-6 are in the same straight line, the oil pump can be conveniently mounted on a forklift, the axes of the oil inlet 2-1 and the oil outlet 2-6 are coaxial, the axes of the oil inlet 2-1 and the oil outlet 2-6 are parallel to the connecting line of the flange bolt holes of the front cover and are preferably 16mm away from each other, the oil inlet 2-1 and the oil outlet 2-6 are positioned on one side of gear shaft meshing, and the oil inlet 2-1 and the oil outlet 2-6 can be connected through flanges or threads. The gear shaft 9 is an external gear and the gear ring 10 is an internal gear, and a crescent-shaped cavity is formed between the two, is filled by the oil distribution disc 17 and the oil distribution disc rack 16, and is divided into a low-pressure area 21 and a high-pressure area 22. Axial clearance compensation plates are respectively arranged on the two axial sides of the high-pressure area 22.

The utility model relates to a clockwise rotation also can be designed for anticlockwise rotation, two kinds of rotation modes only need with oil inlet 2-1, go out to have a mouth 2-6 and high-pressure area 22, low-pressure area 21 mirror image arrangement can. In the embodiment, the hydraulic pump is rotated counterclockwise, when the gear shaft 9 rotates counterclockwise, the gear shaft 9 on the side of the low-pressure region 2 and the teeth on the gear ring 10 are separated from each other, the volume of the low-pressure region becomes larger, negative pressure is generated, hydraulic oil can be sucked into the low-pressure region 21 in the hydraulic pump from the oil inlet 2-1, the gap between the two teeth continuously pumps the hydraulic oil from the low-pressure region 21 to the high-pressure region 22 along with the rotation of the gear shaft 9, the two teeth are gradually close to each other at the meshing position of the gear shaft 9 and the gear ring 11 in the high-pressure region 22, the volume is reduced, high pressure is generated, and finally the hydraulic oil is pumped into a hydraulic system.

The utility model discloses be provided with axial clearance compensation structure, including preceding axial clearance compensation mechanism and back axial clearance compensation mechanism, and axial clearance compensation structure still can be for preceding axial clearance compensation mechanism or back axial clearance compensation mechanism, mainly play sealed effect, back axial clearance compensation mechanism's back plastic pad 7 and sealed pad 6, preceding axial clearance compensation mechanism's sealed pad 6 and preceding plastic pad 12 are installed respectively on the high-pressure chamber of back lid 3 and protecgulum 1, be provided with the oilhole in back axial compensation plate 8 or the preceding axial compensation plate 11, introduce the bearing high-pressure chamber with the hydraulic oil of pump chamber high-pressure district. Wherein the front plastic pad 12 and the rear plastic pad 7 mainly play a role of supporting the sealing gasket 6, and prevent the sealing gasket 6 from extruding out of a gap under high pressure and sealing failure. And the area of the high-pressure cavity in the front cover 1 and the rear cover 3 is designed to be larger than the high-pressure area of the joint surface of the front cover 1 and the rear cover 3 with the gear, the axial plate is pressed to the gear under the hydraulic pressure, the leakage amount of the axial clearance between the gear shaft 9 and the gear ring 10 is reduced, and the volumetric efficiency is improved.

The utility model discloses an internal gear pump design has radial clearance compensation structure, and this structure is by joining in marriage oil pan frame 16, big spring leaf 20, joining in marriage food tray 17, little spring leaf 19, sealed roller 18, backstop round pin 15 and constitute. The oil distribution disc rack 16 is matched with the addendum circle of the gear shaft 9 to form a sealing surface, and the oil distribution disc 17 is matched with the addendum circle of the gear ring 10 to form a sealing surface; the sealing roller 18 fills the gap between the oil distribution plate holder 16 and the oil distribution plate 17, and the cylindrical sealing roller 18 is tangent to the oil distribution plate 17 and the oil distribution plate holder 16 to form sealing surfaces which divide a crescent-shaped chamber between the gear shaft 9 and the gear ring 10 into a high pressure area 22 and a low pressure area 21. The action of the large spring leaf 20 ensures that the oil distribution disc 17 and the oil distribution disc rack 16 are attached to two addendum circles, and the action of the small spring leaf 19 ensures that the sealing roller 18 is contacted with the oil distribution disc 17 and the oil distribution disc rack 16, so that the sealing reliability is ensured. And through the design of sealing roller 18 position, guarantee to join in marriage the hydraulic pressure between oil pan 17 and the oil pan frame 16 and be greater than the hydraulic pressure between addendum circle and join in marriage oil pan 17 or join in marriage the oil pan frame 16 all the time, guarantee that radial seal is reliable.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. The utility model provides an internal gear pump, is including adopting forged aluminium material to make and the protecgulum (1), midbody (2) and the back lid (3) that connect gradually, be provided with the flange on protecgulum (1) be provided with the bolt hole with flange fixed mounting on midbody (2), midbody (2) with back lid (3) are fixed through bolt (4) midbody (2) inboard is provided with ring gear (10) every concave tooth portion of ring gear (10) all sets up porose (10-1), ring gear (10) and gear shaft (9) meshing, its characterized in that: an O-shaped ring (5) and a front axial clearance compensation mechanism are arranged between the front cover (1) and the intermediate body (2), an oil inlet (2-1) and an oil outlet (2-6) are coaxially arranged on the intermediate body (2), a pump cavity low-pressure area (2-3) is formed by the intermediate body (2) and the clearance between the front cover (1) and the rear cover (3), an oil inlet groove (2-2) is enclosed by the intermediate body (2) and the gear ring (10), a low-pressure area (21) and a high-pressure area (22) are arranged between the gear shaft (9) and the gear ring (10), the high-pressure area (22) is communicated with the oil outlet (2-6) through a hole (10-1) in the gear ring (10), a pump body high-pressure cavity groove (2-4), an oil outlet channel (2-5), and the low-pressure area (21) is communicated with the oil outlet (2-6) through a hole (10-1) in the gear ring (10), The pump cavity low-pressure area (2-3), the oil inlet groove (2-2) and the oil inlet (2-1) are communicated, and an O-shaped ring (5) and a rear axial clearance compensation mechanism are arranged between the intermediate body (2) and the rear cover (3).

2. A crescent gear pump as set forth in claim 1, wherein: and a shaft sleeve for supporting the gear shaft (9) and an installation spigot which is coaxial with the gear shaft (9) are embedded on the front cover (1).

3. A crescent gear pump as set forth in claim 1, wherein: an oil distribution disc (17), an oil distribution disc frame (16) and a stop pin (15) are further arranged between the gear shaft (9) and the gear ring (10), and a sealing rod (18), a small spring piece (19) and a large spring piece (20) are arranged between the oil distribution disc (17) and the oil distribution disc frame (16).

4. A crescent gear pump according to any of claims 1-3, wherein: the middle body (2) is provided with three pump cavity low-pressure areas (2-3), two pump body high-pressure cavity grooves (2-4) are uniformly distributed among the three pump cavity low-pressure areas (2-3), each pump body high-pressure cavity groove (2-4) is provided with an oil outlet passage (2-5) communicated with the oil outlet (2-6), and the upper side and the lower side of each pump body high-pressure cavity groove (2-4) are provided with supporting surfaces.

5. A crescent gear pump according to claim 4, wherein: preceding axial clearance compensation mechanism includes sealed pad (6), preceding axial compensation board (11) and preceding plastic pad (12), sealed pad (6) and preceding plastic pad (12) set up preceding axial compensation board (11) with between protecgulum (1).

6. A crescent gear pump according to claim 5, wherein: the rear axial clearance compensation mechanism comprises a rear axial compensation plate (8), a rear plastic pad (7) and a sealing pad (6), wherein the rear plastic pad (7) and the sealing pad (6) are arranged on the rear side of the rear axial compensation plate (8).

7. A crescent gear pump according to claim 6, wherein: the sealing gaskets (6) are arranged between the rear plastic pad (7) and the rear cover (3) and between the front plastic pad (12) and the front cover (1).

8. A crescent gear pump as set forth in claim 7, wherein: the front cover (1) and the rear cover (3) are respectively provided with a shaft sleeve mounting hole, a stop pin mounting hole and a high-pressure cavity.

9. A crescent gear pump as set forth in claim 8, wherein: and a framework oil seal (13) and a check ring (14) for holes are arranged between the gear shaft and the front cover.

10. A crescent gear pump as set forth in claim 1, wherein: the oil inlet (2-1) is larger than or equal to 35mm, the axis of the oil inlet (2-1) is deviated to the meshing position of the gear shaft (9) and the gear ring (10), and the linear distance between the axis of the oil inlet (2-1) and the axis of the gear shaft (9) is L.