阅读说明：本技术 一种柱塞泵 (Plunger pump ) 是由 不公告发明人 于 2019-09-29 设计创作，主要内容包括：本发明公开了一种柱塞泵,包括泵壳,设置在泵壳左端的左端盖、设置在泵壳右端的右端盖；所述右端盖的偏心位置转动连接有转轴；所述转轴上固定安装有转子,所述转子偏心地位于泵壳内；所述泵壳的圆周外侧设有与进油腔连通的进油口；所述转子内设有多个左右贯穿的柱塞孔；每个柱塞孔内均滑动连接有柱塞,所述进油腔内设有斜盘组件；所述泵壳内设有齿轮泵组件；所述泵壳内固定安装有右配流盘；所述右配流盘上设有第一配流孔；所述左端内固定安装有左配流盘,所述左配流盘上设有第二配流孔、第三配流孔、第四配流孔；该柱塞泵不仅结构简单,而且能提升柱塞泵吸油腔内压力的,辅助柱塞吸油。(The invention discloses a plunger pump, which comprises a pump shell, a left end cover arranged at the left end of the pump shell and a right end cover arranged at the right end of the pump shell, wherein the left end cover is arranged at the left end of the pump shell; the eccentric position of the right end cover is rotatably connected with a rotating shaft; the rotor is fixedly arranged on the rotating shaft and eccentrically positioned in the pump shell; an oil inlet communicated with the oil inlet cavity is formed in the outer side of the circumference of the pump shell; a plurality of plunger holes which penetrate left and right are formed in the rotor; a plunger is connected in each plunger hole in a sliding manner, and a swash plate assembly is arranged in the oil inlet cavity; a gear pump assembly is arranged in the pump shell; a right valve plate is fixedly arranged in the pump shell; a first distributing hole is formed in the right distributing plate; a left flow distribution plate is fixedly arranged in the left end, and a second flow distribution hole, a third flow distribution hole and a fourth flow distribution hole are formed in the left flow distribution plate; the plunger pump is simple in structure, and can improve the pressure in the oil suction cavity of the plunger pump to assist the plunger in sucking oil.)

1. A plunger pump comprises a pump shell, a left end cover arranged at the left end of the pump shell, and a right end cover arranged at the right end of the pump shell; the pump is characterized in that the eccentric position of the right end cover is rotatably connected with a rotating shaft, the left end of the rotating shaft penetrates through the pump shell to be rotatably connected to the left end cover, and the right end of the rotating shaft extends out of the right end cover; the rotor is fixedly arranged on the rotating shaft and eccentrically positioned in the pump shell; an oil inlet cavity is formed between the right end of the rotor and the right end cover in the pump shell, and an oil inlet communicated with the oil inlet cavity is formed at the position, close to the right end cover, of the outer side of the circumference of the pump shell; a plurality of plunger holes which penetrate through the rotor from left to right are uniformly arranged in the rotor at intervals by taking the rotating shaft as the center; a plunger is connected in each plunger hole in a sliding manner, a swash plate assembly is arranged in the oil inlet cavity, and the swash plate assembly is connected with the right end of the plunger and is used for driving the plunger to reciprocate in the plunger hole when the rotor rotates; a gear pump assembly is arranged on the outer side of the circumference of the rotor in the pump shell; a right port plate is fixedly arranged on the outer side of the circumference of the right end of the rotor in the pump shell, and the right end of the rotor is rotatably connected in the right port plate; the right port plate is provided with a first port hole for communicating the oil inlet cavity with an oil suction port of the gear pump assembly; a left flow distribution plate is fixedly arranged at the left end of the rotor in the left end, and a second flow distribution hole communicated with an oil discharge port of the gear pump assembly, a third flow distribution hole communicated with an oil absorption area at the left end of the rotor and a fourth flow distribution hole communicated with an oil discharge area at the right end of the rotor are formed in the left flow distribution plate; a first distributing groove used for communicating the second distributing hole with the third distributing hole and a second distributing groove communicated with the fourth distributing hole are formed in the left end cover; an oil outlet communicated with the second flow distribution groove is formed in the circumferential side face of the left end cover; an overflow valve is inserted in the left end cover, a fifth distributing hole communicated with an oil suction port of the gear pump assembly is formed in the left distributing disc, and a third distributing groove communicated with the fifth distributing hole is formed in the left end cover; and a first through hole for communicating the first distributing groove with the inlet of the overflow valve and a second through hole for communicating the third distributing groove with the outlet of the overflow valve are formed in the left end cover.

2. The plunger pump of claim 1, wherein the gear pump assembly comprises an outer gear sleeve, an inner gear sleeve, a crescent shaped diaphragm; the inner gear sleeve is rotatably connected in the pump shell and positioned outside the circumference of the rotor, the outer gear sleeve is fixedly arranged outside the circumference of the rotor and meshed with the inner gear sleeve, and the outer gear sleeve is positioned at the eccentric position of the inner gear sleeve; the crescent partition plate is positioned in a gap between the outer gear sleeve and the inner gear sleeve.

3. The plunger pump of claim 1, wherein the swash plate assembly comprises a swash plate, a positioning plate, a hemispherical positioning sleeve, the swash plate being fixedly mounted in a right end cap centered on a rotating shaft; the right end of the rotor is provided with a shaft sleeve extending towards the right end cover, and the positioning sleeve is arranged on the shaft sleeve; the positioning disc is sleeved on the rotating shaft and located between the positioning sleeve and the swash plate, a plurality of piston shoes which correspond to the plungers one by one are uniformly arranged on the positioning disc at intervals by taking the rotating shaft as a center, the piston shoes are connected on the inclined surface of the swash plate in a sliding mode, and the right end ball of each plunger is connected to the corresponding piston shoe.

4. The plunger pump of claim 1, wherein the third port is a kidney-shaped port.

5. The plunger pump of claim 1, wherein four notches are uniformly spaced on the inner circumferential side wall of the pump housing, and four protrusions are provided on the circumferential side surface of the right port plate in the notches.

6. The plunger pump of claim 3, wherein the plunger bore, plunger, and slipper are all six.

Technical Field

The invention belongs to the technical field of hydraulic pumps, and particularly relates to a plunger pump.

Background

The axial plunger pump is a hydraulic power element widely applied to a hydraulic system, but the self-suction capacity of the axial plunger pump is poor, when the axial plunger pump works, insufficient oil suction is easily caused if the oil pressure supplied to an inlet is low, cavitation is caused due to suction, vibration and noise are caused, the quick abrasion of a friction pair in the pump accelerates the failure of the pump, the service life of the pump is influenced, and therefore the problem of insufficient oil suction at the inlet of the axial plunger pump has great influence on the stable work of the axial plunger pump.

Disclosure of Invention

Technical problem to be solved

The invention aims to provide a plunger pump for assisting a plunger to suck oil, which can improve the pressure in an oil suction cavity of the plunger pump.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: a plunger pump comprises a pump shell, a left end cover arranged at the left end of the pump shell, and a right end cover arranged at the right end of the pump shell; the eccentric position of the right end cover is rotatably connected with a rotating shaft, the left end of the rotating shaft penetrates through the pump shell to be rotatably connected to the left end cover, and the right end of the rotating shaft extends out of the right end cover; the rotor is fixedly arranged on the rotating shaft and eccentrically positioned in the pump shell; an oil inlet cavity is formed between the right end of the rotor and the right end cover in the pump shell, and an oil inlet communicated with the oil inlet cavity is formed at the position, close to the right end cover, of the outer side of the circumference of the pump shell; a plurality of plunger holes which penetrate through the rotor from left to right are uniformly arranged in the rotor at intervals by taking the rotating shaft as the center; a plunger is connected in each plunger hole in a sliding manner, a swash plate assembly is arranged in the oil inlet cavity, and the swash plate assembly is connected with the right end of the plunger and is used for driving the plunger to reciprocate in the plunger hole when the rotor rotates; a gear pump assembly is arranged on the outer side of the circumference of the rotor in the pump shell; a right port plate is fixedly arranged on the outer side of the circumference of the right end of the rotor in the pump shell, and the right end of the rotor is rotatably connected in the right port plate; the right port plate is provided with a first port hole for communicating the oil inlet cavity with an oil suction port of the gear pump assembly; a left flow distribution plate is fixedly arranged at the left end of the rotor in the left end, and a second flow distribution hole communicated with an oil discharge port of the gear pump assembly, a third flow distribution hole communicated with an oil absorption area at the left end of the rotor and a fourth flow distribution hole communicated with an oil discharge area at the right end of the rotor are formed in the left flow distribution plate; a first distributing groove used for communicating the second distributing hole with the third distributing hole and a second distributing groove communicated with the fourth distributing hole are formed in the left end cover; an oil outlet communicated with the second flow distribution groove is formed in the circumferential side face of the left end cover; an overflow valve is inserted in the left end cover, a fifth distributing hole communicated with an oil suction port of the gear pump assembly is formed in the left distributing disc, and a third distributing groove communicated with the fifth distributing hole is formed in the left end cover; and a first through hole for communicating the first distributing groove with the inlet of the overflow valve and a second through hole for communicating the third distributing groove with the outlet of the overflow valve are formed in the left end cover.

In a further technical scheme, the gear pump assembly comprises an outer gear sleeve, an inner gear sleeve and a crescent partition plate; the inner gear sleeve is rotatably connected in the pump shell and positioned outside the circumference of the rotor, the outer gear sleeve is fixedly arranged outside the circumference of the rotor and meshed with the inner gear sleeve, and the outer gear sleeve is positioned at the eccentric position of the inner gear sleeve; the crescent partition plate is positioned in a gap between the outer gear sleeve and the inner gear sleeve.

In a further technical scheme, the swash plate assembly comprises a swash plate, a positioning plate and a hemispherical positioning sleeve, wherein the swash plate is fixedly arranged in the right end cover by taking the rotating shaft as the center; the right end of the rotor is provided with a shaft sleeve extending towards the right end cover, and the positioning sleeve is arranged on the shaft sleeve; the positioning disc is sleeved on the rotating shaft and located between the positioning sleeve and the swash plate, a plurality of piston shoes which correspond to the plungers one by one are uniformly arranged on the positioning disc at intervals by taking the rotating shaft as a center, the piston shoes are connected on the inclined surface of the swash plate in a sliding mode, and the right end ball of each plunger is connected to the corresponding piston shoe.

In a further technical scheme, the third distributing hole is a kidney-shaped hole.

In a further technical scheme, four clamping grooves are uniformly arranged on the inner circumferential side wall of the pump shell at intervals, and four protrusions located in the clamping grooves are arranged on the circumferential side surface of the right valve plate.

In a further technical scheme, the plunger hole, the plunger and the sliding shoe are all six.

(III) advantageous effects

Compared with the prior art, the technical scheme of the invention has the following advantages:

the gear pump assembly is arranged outside the rotor to pre-boost the hydraulic oil and discharge the hydraulic oil into the plunger hole, so that the plunger can absorb oil more easily in the upward movement process, the problem of insufficient self-absorption capacity of the plunger pump is solved, the cavitation phenomenon of the plunger pump is avoided, and the service life of the plunger pump is prolonged.

Drawings

FIG. 1 is a front view of the present invention;

FIG. 2 is a left side view of the present invention;

FIG. 3 is a top view of the present invention;

FIG. 4 is a block diagram of the present invention;

FIG. 5 is an exploded view of the present invention;

FIG. 6 is a partial cross-sectional view of the invention;

FIG. 7 is a cross-sectional view of the present invention;

FIG. 8 is a cross-sectional view of section A-A of the present invention

FIG. 9 is a block diagram of the right port plate of the present invention;

FIG. 10 is a block diagram of the left port plate of the present invention;

FIG. 11 is a block diagram of the left end cap of the present invention;

fig. 12 is a structural view of the pump casing of the present invention.

Detailed Description

Referring to fig. 1 to 12, a plunger pump includes a pump housing 11, a left end cap 12 disposed at a left end of the pump housing 11, and a right end cap 1 disposed at a right end of the pump housing 11; the eccentric position of the right end cover 1 is rotatably connected with a rotating shaft 13, the left end of the rotating shaft 13 penetrates through the pump shell 11 and is rotatably connected to the left end cover 12, and the right end of the rotating shaft 13 extends out of the right end cover 1; the rotor 7 is fixedly arranged on the rotating shaft 13, and the rotor 7 is eccentrically positioned in the pump shell 11; an oil inlet cavity 11a is formed between the right end of the rotor 7 and the right end cover 1 in the pump shell 11, and an oil inlet 1101 communicated with the oil inlet cavity 11a is arranged on the outer side of the circumference of the pump shell 11 and close to the right end cover 1; six plunger holes 7a penetrating left and right are uniformly arranged in the rotor 7 at intervals by taking the rotating shaft 13 as a center; a plunger 8 is connected in each plunger hole 7a in a sliding mode, a swash plate assembly is arranged in the oil inlet cavity 11a, and the swash plate assembly is connected with the right end of the plunger 8 and used for driving the plunger 8 to reciprocate in the plunger hole 7a when the rotor 7 rotates; a gear pump assembly is arranged inside the pump housing 11 outside the circumference of the rotor 7.

A right valve plate 6 is fixedly installed on the outer side of the circumference of the right end of the rotor 7 in the pump shell 11, the right end of the rotor 7 is rotatably connected in the right valve plate 6, four clamping grooves 11b are uniformly arranged on the inner circumferential side wall of the pump shell 11 at intervals, and four protrusions 601 positioned in the clamping grooves 11b are arranged on the circumferential side surface of the right valve plate 6; the right port plate 6 is provided with a first port hole 6a for communicating the oil inlet cavity 11a with an oil suction port of the gear pump assembly; a left port plate 2 is fixedly arranged at the left end of the rotor 7 in the left end, and a second port hole 2a communicated with an oil discharge port of the gear pump assembly, a third port hole 2b communicated with an oil absorption area at the left end of the rotor 7 and a fourth port hole 2c communicated with an oil discharge area at the right end of the rotor 7 are formed in the left port plate 2; here, the third orifice 2b is a kidney-shaped hole. A first distributing groove 1a for communicating the second distributing hole 2a with the third distributing hole 2b and a second distributing groove 1b communicated with the fourth distributing hole 2c are arranged in the left end cover 12; an oil outlet 1201 communicated with the second distributing groove 1b is arranged on the circumferential side surface of the left end cover 12; an overflow valve 14 is inserted into the left end cover 12, a fifth distributing hole 2d communicated with an oil suction port of the gear pump assembly is arranged on the left distributing disc 2, and a third distributing groove 1c communicated with the fifth distributing hole 2d is arranged in the left end cover 12; the left end cover 12 is internally provided with a first through hole 1d for communicating the first distributing groove 1a with the inlet of the overflow valve 14, and a second through hole 1e for communicating the third distributing groove 1c with the outlet of the overflow valve 14.

The gear pump assembly comprises an outer gear sleeve 5, an inner gear sleeve 3 and a crescent partition plate 4; the inner gear sleeve 3 is rotatably connected in the pump shell 11 and positioned outside the circumference of the rotor 7, the outer gear sleeve 5 is fixedly arranged outside the circumference of the rotor 7 and meshed with the inner gear sleeve 3, and the outer gear sleeve 5 is positioned at the eccentric position of the inner gear sleeve 3; the crescent-shaped partition plate 4 is positioned in the gap between the outer gear sleeve 5 and the inner gear sleeve 3.

The swash plate assembly comprises a swash plate 10, a positioning plate 9 and a hemispherical positioning sleeve 66, wherein the swash plate 10 is fixedly arranged in the right end cover 1 by taking the rotating shaft 13 as the center; the right end of the rotor 7 is provided with a shaft sleeve 701 extending to the right end cover 1, and the positioning sleeve 66 is arranged on the shaft sleeve 701; positioning disk 9 cup joints on pivot 13 and is located between position sleeve 66 and sloping cam plate 10, use pivot 13 to be equipped with six slipper 77 with plunger 8 one-to-one as the center interval on the positioning disk 9 evenly, slipper 77 sliding connection is on the inclined plane of sloping cam plate 10, the right-hand member ball of plunger 8 connects on slipper 77 rather than corresponding.

When the plunger pump needs to work, the motor needs to be connected with a rotating shaft 13 of the plunger pump, the motor is started to drive the rotating shaft 13 to rotate, so that the rotor 7 is driven to rotate, because the rotor 7 is connected with an outer gear sleeve 5 through a flat key, and because the inner gear sleeve 3 is meshed with the outer gear sleeve 5 which is eccentrically arranged, the rotor 7 is driven to work when rotating, so that hydraulic oil enters the gear pump assembly from an oil inlet 1101 through a first distributing hole 6a to be subjected to preliminary pressurization, enters a first distributing groove 1a through a second distributing hole 2a, enters a plunger hole 7a in an oil suction area at the left end of the rotor 7 through a third distributing hole 2b, the oil provided by the gear pump assembly is larger than the oil required by the plunger pump, and the surplus oil passes through the first distributing hole 1a, a first through hole 1d, an inlet of an overflow valve 14, an outlet of the overflow valve 14, and a second through hole 1e, Enters the third distributing groove 1c and then flows back to the oil suction port of the gear pump assembly through the fifth distributing hole 2 d; the oil entering the plunger hole 7a rotates through the rotor 7, the plunger 8 enables the hydraulic oil to enter the oil outlet 1201 through the fourth distributing hole 2c and the second distributing groove 1b under the action of the sliding shoe 77, the positioning disc 9 and the swash plate 10, and the pump is excluded, in the invention, the hydraulic oil is pre-boosted through a gear pump assembly outside the rotor 7 and is discharged into the plunger hole 7a, so that the plunger 8 can absorb oil more easily in the upward movement process, and the pressure of the oil transmitted into the plunger hole 7a can be controlled more accurately through the adjustment of the overflow valve 14, thereby solving the problem of insufficient self-priming capability of the plunger pump, avoiding the cavitation phenomenon of the plunger pump and prolonging the service life of the plunger pump.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.