CN111486089A - High-pressure cycloid internal gear pump - Google Patents

High-pressure cycloid internal gear pump Download PDF

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Publication number
CN111486089A
CN111486089A CN201910086459.0A CN201910086459A CN111486089A CN 111486089 A CN111486089 A CN 111486089A CN 201910086459 A CN201910086459 A CN 201910086459A CN 111486089 A CN111486089 A CN 111486089A
Authority
CN
China
Prior art keywords
oil
gear pump
plate
cover plate
groove
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910086459.0A
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Chinese (zh)
Inventor
姜继海
葛泽华
吴金光
张冠隆
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Harbin Institute of Technology
Original Assignee
Harbin Institute of Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Harbin Institute of Technology filed Critical Harbin Institute of Technology
Priority to CN201910086459.0A priority Critical patent/CN111486089A/en
Publication of CN111486089A publication Critical patent/CN111486089A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/08Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/101Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with a crescent-shaped filler element, located between the inner and outer intermeshing members
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0023Axial sealings for working fluid
    • F04C15/0026Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type machines or pumps, e.g. gear machines or pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0042Systems for the equilibration of forces acting on the machines or pump
    • F04C15/0046Internal leakage control

Abstract

The invention provides a high-pressure cycloid internal gear pump, belongs to the technical field of positive displacement hydraulic pumps, and particularly relates to a high-pressure cycloid internal gear pump. The problems that the traditional cycloid internal gear pump has no pressure compensation measure, large leakage, low working pressure and limited application occasions are solved. The device comprises a shell, an inner rotor shaft, a bearing, an outer rotor and a pressure compensation device. The high-pressure high-speed cycloid internal gear pump is mainly used for high-pressure high-speed cycloid internal gear pumps.

Description

High-pressure cycloid internal gear pump
Technical Field
The invention belongs to the technical field of positive displacement hydraulic pumps, and particularly relates to a high-pressure cycloid internal gear pump.
Background
The cycloidal internal gear pump is one kind of positive displacement hydraulic pump, has the advantages of simple structure, great displacement volume ratio, high filling performance, light weight, etc. and may be used widely in machine tool, vehicle transportation, food machine and other fields. The outer rotor and the inner rotor of the traditional cycloid internal gear pump realize the sealing of high and low pressure cavities by means of a plurality of simultaneously existing meshing points, and the leakage is large without pressure compensation measures, so that the working pressure of the traditional cycloid internal gear pump is low, generally within 4MPa, the traditional cycloid internal gear pump can only be used in a low-pressure hydraulic system, and the application occasion of the traditional cycloid internal gear pump is limited.
Disclosure of Invention
The invention provides a high-pressure cycloid internal gear pump for solving the problems in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme: a high-pressure cycloid internal gear pump is characterized in that: the pressure compensation device comprises a floating side plate, a valve plate and a fixing ring, wherein two sides of a rotor of the inner rotor shaft are respectively connected with the bearing, the bearing is fixedly connected inside the axial center of the shell, a cylindrical groove is eccentrically arranged in the shell, the fixing ring is fixedly connected in the cylindrical groove, the outer rotor is arranged in the fixing ring and rotates along the fixing ring, the inner rotor shaft and the outer rotor are mutually meshed to form a rotor pair, the inner rotor shaft drives the outer rotor to rotate to divide a gear pump into an oil suction area and an oil discharge area, the shell is provided with an oil suction window and an oil discharge window corresponding to the oil suction area and the oil discharge area, the floating side plate is positioned on the left side of the rotor pair, is arranged on the bearing and is fixedly connected with the shell, and a non-penetrating crescent groove is arranged on the contact side of the floating side plate and the shell in the oil discharge, the outline of oil extraction district crescent moon groove is in the oil extraction window, be provided with the hole that runs through in the oil extraction district crescent moon groove, the curb plate that floats is inhaled the oil and is distinguished the interior crescent moon groove that is provided with not running through with the vice contact side of rotor, the outline of oil absorption district crescent moon groove is in the oil absorption window, the valve plate is located the vice right side of rotor, installs on the bearing and with casing fixed connection, there are two waist type grooves to correspond respectively in the valve plate and inhale oil district and oil extraction district, gu fixed ring is provided with the projection at the center of radial direction upside and is the recess of rectangle.
Furthermore, the shell comprises a front cover plate and a rear cover plate, the front cover plate and the rear cover plate are fixedly connected through an inner hexagonal screw and a combined gasket, a threaded hole is formed in the front cover plate, threaded interfaces are arranged on the oil suction window and the oil discharge window of the rear cover plate, and an O-shaped ring is arranged between the front cover plate and the rear cover plate.
Furthermore, the tooth profile of the inner rotor shaft is an equidistant curve of a short-amplitude epicycloid, and the tooth profile of the outer rotor is a partial arc tooth profile conjugated with the tooth profile of the inner rotor shaft.
Furthermore, a lip-shaped sealing ring and a spring retainer ring are arranged on the outer side of the inner rotor shaft, so that axial sealing is realized.
Furthermore, the projection of the fixing ring is a rectangular groove, the length of the groove is one third of the length of the inner circumference of the fixing ring, the width of the groove is larger than the thickness of the outer rotor and smaller than the width of the fixing ring, and the depth of the groove is lower than the thickness of the fixing ring.
Furthermore, the floating side plate is fixedly connected with the shell through a first cylindrical pin, the valve plate is fixedly connected with the shell through another first cylindrical pin, and a second cylindrical pin is arranged between the fixing ring and the shell.
Furthermore, the oil suction window and the oil discharge window are connected with a hydraulic pipeline.
Compared with the prior art, the invention has the beneficial effects that: the invention reduces the flow leakage of the cycloid internal gear pump, improves the working pressure of the cycloid internal gear pump and enlarges the application occasions of the cycloid internal gear pump. The invention reduces the leakage of the pump by designing the pressure compensation device in the axial direction and the radial direction of the rotor pair so as to improve the volume efficiency and the working pressure, adopts the floating side plate with the crescent groove and the drainage hole, the wear-resistant valve plate with the waist-shaped groove and the fixing ring with the single-side groove to form the pressure compensation device, by introducing the hydraulic oil in the oil discharge area to the opposite side of the floating side plate and the oil discharge area, the axial clearance between the floating side plate and the rotor pair is reduced, by introducing the hydraulic oil in the oil discharge area into the groove at the side of the high-pressure area of the fixing ring, the outer rotor and the fixing ring are not eccentric, the radial clearance is reduced, the axial clearance between the rotor pair and the pump shell is adjusted through the valve plate, so that the clearance in the pump is not too large after the pump works for a period of time, the leakage flow in the pump is reduced through pressure compensation measures, so that the pump has better sealing performance, and the working pressure of the cycloid pump is improved. The invention can be used as a power element in a hydraulic system with the working pressure within 10MPa, has good self-absorption performance and can work at high rotating speed.
Drawings
FIG. 1 is a schematic structural view of a high-pressure cycloid internal gear pump according to the present invention
FIG. 2 is a schematic side structure view of a high-pressure cycloid internal gear pump according to the present invention
1-front cover plate, 2-rear cover plate, 3-inner rotor shaft, 4-bearing, 5-lip type sealing ring, 6-spring retainer ring, 7-floating side plate, 8-outer rotor, 9-valve plate, 10-fixing ring, 11-O type ring, 12-inner hexagon screw, 13-combined gasket, 14-first cylindrical pin, 15-second cylindrical pin
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely explained below with reference to the drawings in the embodiments of the present invention.
Referring to fig. 1-2 to illustrate the embodiment, a high-pressure cycloid internal gear pump comprises a housing, an inner rotor shaft 3, a bearing 4, an outer rotor 8 and a pressure compensation device, wherein the pressure compensation device comprises a floating side plate 7, a port plate 9 and a fixing ring 10, two sides of the rotor of the inner rotor shaft 3 are respectively connected with the bearing 4, the bearing 4 is fixedly connected inside the axial center of the housing, a cylindrical groove is eccentrically arranged in the housing, the fixing ring 10 is fixedly connected in the cylindrical groove, the outer rotor 8 is arranged in the fixing ring 10 and rotates along the fixing ring 10, the inner rotor shaft 3 and the outer rotor 8 are mutually meshed to form a rotor pair, the inner rotor shaft 3 drives the outer rotor 8 to rotate, the gear pump is divided into an oil suction area and an oil discharge area, the housing is provided with an oil suction window and an oil discharge window corresponding to the oil, the utility model discloses a rotor oil suction device, including bearing 4, floating curb plate 7, row's oil district, oil distribution plate 9, floating curb plate 7, floating curb plate 10, floating curb plate 7, floating curb plate 9, floating curb plate 10, floating curb plate 9, floating curb plate 10, floating curb plate and floating curb plate 9, floating curb plate 10.
In this embodiment, the housing includes a front cover plate 1 and a rear cover plate 2, the front cover plate 1 and the rear cover plate 2 are fastened and connected by a hexagon socket head cap screw 12 and a combination washer 13, the front cover plate 1 is provided with a threaded hole, the rear cover plate 2 is provided with a screw interface on an oil suction window and an oil discharge window, an O-ring 11 is arranged between the front cover plate 1 and the rear cover plate 2, the housing plays a role of supporting and connecting the whole structure, the front cover plate 1 is provided with a threaded hole, a gear pump is fixed on a flange by the threaded hole, the oil suction window and the oil discharge window are connected with a hydraulic pipeline by the screw interface, the center of the front cover plate 1 and the center of the rear cover plate 2 are provided with holes, two bearings 4 are installed in the holes, an inner rotor shaft 3 is installed on the two bearings and can rotate therein, a large cylindrical groove is left on the front cover plate 1, be provided with second cylindric lock 15 between solid fixed ring 10 and the casing, through the rotation of the solid fixed ring 10 of second cylindric lock 15 restriction, the curb plate 7 that floats is through first cylindric lock 14 and casing fixed connection, valve plate 9 is through another first cylindric lock 14 and casing fixed connection, and the inner rotor axle 3 outside is provided with lip type sealing washer 5 and circlip 6, realizes axial seal, and O type circle 11 is installed and is used for radial seal between front shroud 1 and back shroud 2. The inner rotor shaft 3 and the outer rotor 8 are in an inner meshing mode, the inner rotor shaft 3 drives the outer rotor 8, hydraulic oil is sucked and discharged through the change of the volume of a cavity between a rotor pair, the tooth profile of the inner rotor shaft 3 is an equidistant curve of a short-amplitude epicycloid, the tooth profile of the outer rotor 8 is a partial circular arc tooth profile conjugated with the tooth profile of the inner rotor shaft 3, the inner rotor and the outer rotor are arranged in an eccentric mode, a gear pump is divided into an oil suction area and an oil discharge area according to different rotation directions, an oil suction window and an oil discharge window are arranged at corresponding positions of a rear cover plate 2 and are connected with a hydraulic pipeline, a through hole arranged in a crescent groove of an oil discharge area of a floating side plate 7 introduces the hydraulic oil in the oil discharge area into a crescent groove of the oil discharge area, a projection arranged on a fixing ring 10 is a rectangular groove, the groove length is one third of the inner circumference length of the fixing ring 10, the groove depth is lower than the thickness of the fixing ring 10.
The inner rotor shaft 3 is a driving shaft of the gear pump, the outer rotor 8 is a driven shaft of the gear pump, and when the gear pump rotates clockwise when viewed from an input end to the inside of the pump, an oil discharge area is arranged above the gear pump in the graph 1-2, and an oil suction area is arranged below the gear pump. When the gear pump works, the hydraulic oil pressure in the oil discharge area is higher, the pressure in the oil suction area is lower, thrust is generated on the upper side of the floating side plate 7, the stress on the upper side and the lower side of the floating side plate 7 is unbalanced, and offset is easily generated, but because the high-pressure hydraulic oil flows into the crescent groove on the upper side of the floating side plate 7 through the through small hole, the pressure of the high-pressure oil in the crescent groove on the floating side plate 7 is balanced with the pressure of the cavity of the oil discharge area on the floating side plate 7, the left and right stress of the floating side plate 7 is balanced, the gap is reduced, the sealing performance of the cycloid pump is improved; hydraulic oil in an oil discharge area generates thrust on the upper side of the port plate 9, the upper side and the lower side of the port plate 9 are unbalanced in stress and easily generate offset, but because a gap also exists between the port plate 9 and the rear cover plate 2, high-pressure hydraulic oil flows to the right side of the port plate 9 and compensates the stress of the port plate 9 leftwards, the abrasion influence of the pump after long-time working is reduced, the gap is reduced, and the sealing performance of the cycloid pump is improved; the hydraulic oil in the oil discharge area generates thrust on the upper side of the fixing ring 10, the upper side and the lower side of the fixing ring are unbalanced in stress and eccentric easily, however, because the high-pressure hydraulic oil flows into the groove in the upper side of the fixing ring 10 through the left side and the right side of the outer rotor, the pressure of the high-pressure oil on the fixing ring 10 in the groove and the pressure of the oil discharge area containing cavity on the fixing ring 10 are balanced, the upper side and the lower side of the fixing ring 10 are balanced in stress, gaps.
In this embodiment, the gear pump is not limited to rotate clockwise when viewed from the input end to the pump, but may also rotate counterclockwise, at this time, the positions of the oil discharge area and the oil suction area are exchanged, and the floating side plate 7, the port plate 9 and the fixing ring 10 in the pressure compensation device need to be installed in a rotating manner by 180 degrees.
The high-pressure cycloid internal gear pump provided by the invention is described in detail, a specific example is applied in the text to explain the principle and the implementation mode of the invention, and the description of the example is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (7)

1. A high-pressure cycloid internal gear pump is characterized in that: the pressure compensation device comprises a floating side plate (7), a flow distribution disc (9) and a fixing ring (10), wherein two sides of a rotor of the inner rotor shaft (3) are respectively connected with the bearing (4), the bearing (4) is fixedly connected inside the axial center of the shell, a cylindrical groove is eccentrically arranged in the shell, the fixing ring (10) is fixedly connected in the cylindrical groove, the outer rotor (8) is installed in the fixing ring (10) and rotates along the fixing ring (10), the inner rotor shaft (3) and the outer rotor (8) are meshed with each other to form a rotor pair, the inner rotor shaft (3) drives the outer rotor (8) to rotate, a gear pump is divided into an oil suction area and an oil discharge area, and the shell is provided with an oil suction window and an oil discharge window corresponding to the oil suction area and the oil discharge area, the utility model discloses a floating oil pump, including bearing (4), floating curb plate (7), oil distribution plate (9), floating curb plate (7) oil discharge district, the outer profile of oil discharge district crescent moon groove is in the oil extraction window, be provided with the hole that runs through in the oil discharge district crescent moon groove, floating curb plate (7) oil suction district is interior to be provided with the crescent moon groove that does not run through with the vice contact side of rotor, the outer profile of oil suction district crescent moon groove is in oil suction window, distribution plate (9) are located the vice right side of rotor, install on bearing (4) and with casing fixed connection, it corresponds oil suction district and oil discharge district respectively to have two waist-shaped grooves in distribution plate (9), gu fixed ring (10) are provided with the recess that the projection is the rectangle at the center of radial direction upside.
2. The high pressure gerotor gear pump of claim 1, wherein: the shell comprises a front cover plate (1) and a rear cover plate (2), the front cover plate (1) and the rear cover plate (2) are fixedly connected through an inner hexagonal screw (12) and a combined gasket (13), a threaded hole is formed in the front cover plate (1), a threaded interface is formed in an oil absorption window and an oil discharge window of the rear cover plate (2), and an O-shaped ring (11) is arranged between the front cover plate (1) and the rear cover plate (2).
3. The high pressure gerotor gear pump of claim 1, wherein: the tooth profile of the inner rotor shaft (3) is an equidistant curve of a short-amplitude epicycloid, and the tooth profile of the outer rotor (8) is a partial arc tooth profile conjugated with the tooth profile of the inner rotor shaft (3).
4. The high pressure gerotor gear pump of claim 1, wherein: a lip-shaped sealing ring (5) and a spring retainer ring (6) are arranged on the outer side of the inner rotor shaft (3) to realize axial sealing.
5. The high pressure gerotor gear pump of claim 1, wherein: the projection of setting on the solid fixed ring (10) is the recess of rectangle, and the groove length is the third of solid fixed ring (10) inner circumference, and the groove width is greater than the thickness of outer rotor (8) and is less than the width of solid fixed ring (10), and the groove depth is less than the thickness of solid fixed ring (10).
6. The high pressure gerotor gear pump of claim 1, wherein: the floating side plate (7) is fixedly connected with the shell through a first cylindrical pin (14), the valve plate (9) is fixedly connected with the shell through another first cylindrical pin (14), and a second cylindrical pin (15) is arranged between the fixing ring (10) and the shell.
7. The high pressure gerotor gear pump of claim 1, wherein: the oil suction window and the oil discharge window are connected with a hydraulic pipeline.
CN201910086459.0A 2019-01-29 2019-01-29 High-pressure cycloid internal gear pump Pending CN111486089A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910086459.0A CN111486089A (en) 2019-01-29 2019-01-29 High-pressure cycloid internal gear pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910086459.0A CN111486089A (en) 2019-01-29 2019-01-29 High-pressure cycloid internal gear pump

Publications (1)

Publication Number Publication Date
CN111486089A true CN111486089A (en) 2020-08-04

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ID=71791442

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910086459.0A Pending CN111486089A (en) 2019-01-29 2019-01-29 High-pressure cycloid internal gear pump

Country Status (1)

Country Link
CN (1) CN111486089A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3887310A (en) * 1973-07-02 1975-06-03 Karol Gerber Hydraulic pump/motor with hydrostatically balanced rotors
CN101608617A (en) * 2008-06-20 2009-12-23 安徽理工大学 A kind of internally-geared low-pulsation gear pump

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3887310A (en) * 1973-07-02 1975-06-03 Karol Gerber Hydraulic pump/motor with hydrostatically balanced rotors
CN101608617A (en) * 2008-06-20 2009-12-23 安徽理工大学 A kind of internally-geared low-pulsation gear pump

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
葛泽华: ""微小型高转速摆线内啮合齿轮泵的研究"", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 *

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Application publication date: 20200804

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