CN203730297U - Elliptic non-circular gear-driven six-blade differential pump - Google Patents

Elliptic non-circular gear-driven six-blade differential pump Download PDF

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Publication number
CN203730297U
CN203730297U CN201420052515.1U CN201420052515U CN203730297U CN 203730297 U CN203730297 U CN 203730297U CN 201420052515 U CN201420052515 U CN 201420052515U CN 203730297 U CN203730297 U CN 203730297U
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noncircular gear
oval noncircular
oval
conjugation
liquid
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CN201420052515.1U
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吴加伟
周宇
徐高欢
陈建能
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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Abstract

The utility model discloses an elliptic non-circular gear-driven six-blade differential pump. The existing differential pump has the problems of difficulty in optimizing pressure pulsation, liquid trapping and the like. A first elliptic non-circular gear and a second elliptic non-circular gear are respectively fixed to an input shaft; a first conjugate elliptic non-circular gear and a first impeller are respectively fixed to an output shaft, and the first conjugate elliptic non-circular gear meshes with the first elliptic non-circular gear; a second conjugate elliptic non-circular gear and a second impeller are respectively fixed to a shaft sleeve, and the shaft sleeve is flexibly sheathed on the output shaft; a pump casing is sequentially provided with a first liquid discharge port, a first liquid suction port, a second liquid discharge port, a second liquid suction port, a third liquid discharge port and a third liquid suction port in the circumferential direction; the first impeller and second impeller are respectively provided with three blades; and the inside of each blade is provided with a one-way relief valve. The differential pump has the advantages of large discharge capacity, stable flow rate and adjustable non-uniform velocity rules, and effectively solves the problem of liquid trapping.

Description

Six blade differential pumps that oval noncircular gear drives
Technical field
The utility model belongs to displacement pump technical field, relates to blade differential pump, is specifically related to six blade differential pumps that a kind of oval noncircular gear drives.
Background technique
The liquid pump that universal machine is conventional has reciprocating pump, plunger pump, diaphragm pump, roller pump and centrifugal pump, wherein: (post) plug pump of living has higher outlet pressure, but requires the sealing between piston and cylinder barrel reliable, and pressure surge is large; Diaphragm pump can produce a liquid stream more stably in the time of multi-cylinder, but complex structure; Roller pump delivery is uniformly in the time of stabilization of speed, and along with the raising of pressure, leakage rate increases, and the lifting rate of pump and efficiency are corresponding to be reduced; Centrifugal pump structure is simple, easily manufacture, but its discharge capacity is large, and pressure is low, for the less demanding occasion of working pressure.There is defect separately in these pumps, can't meet well the constant flow rate of part special mechanical requirement, the demand of high pressure.
Existing differential pump mainly contains following several according to the difference of driving mechanism:
Rotating guide-bar-gear type blade differential pump, its drive system is born alternate load, produces gear tooth noise, and each pair clearance also can cause impact noise when larger.
Universal-joint gear wheel mechanism drive vane differential pump, the input shaft of its universal joint mechanism and the angle of output shaft are key parameters that affects pump performance.This angle is larger, and pump delivery is also larger, and still, along with the increase at this angle, the flow pulsation aggravation of pump and the transmission efficiency of universal joint reduce.
Distortion eccentric circle noncircular gear drive vane differential pump, it is mainly eccentricity and deformation coefficient that its eccentric circle non-circular gear pitch curve is adjusted parameter, adjustment amount is limited, adjust precision not high, cause velocity ratio optimization, adjust inconvenience, design dumbly, be unfavorable for further optimal design, be difficult to optimize the problem such as pressure pulsation, tired liquid.Summary of the invention
The purpose of this utility model is for the deficiencies in the prior art, six blade differential pumps that provide a kind of oval noncircular gear to drive, and this blade differential pump displacement is large, pressure is high, stability of flow, compact structure; Oval non-circular gear pitch curve has six to adjust parameter, and the variable speed rule of its driving mechanism is easily adjusted, convenient function optimization; By unidirectional Decompression valves is installed in blade, when pressure limit, get through contiguous enclosed cavity, effectively solve the tired liquid problem of existing differential pump.
The utility model comprises driver part and differential pump parts.
Described driver part comprises driving gearbox, input shaft, output shaft, the first oval noncircular gear, the second oval noncircular gear, the oval noncircular gear of the first conjugation, the oval noncircular gear of the second conjugation and axle sleeve.Motor is connected with input shaft by coupling, and input shaft is the two side at driving gearbox by two bearings; Described the first oval noncircular gear and the second oval noncircular gear are all fixedly mounted on input shaft; The two ends of output shaft respectively by bearings on the tank wall of driving gearbox and pump case, the oval noncircular gear of the first conjugation is arranged on output shaft, and engages with the first oval noncircular gear; The oval noncircular gear of the second conjugation and the second impeller are all cemented on axle sleeve, and axle sleeve kink is on output shaft, and the oval noncircular gear of the second conjugation engages with the second oval noncircular gear.
Described differential pump parts comprise pump case, the first impeller, the second impeller and unidirectional Decompression valves.Described pump case along the circumferential direction offers the first liquid port, the first liquid sucting port, the second liquid port, the second liquid sucting port, the 3rd liquid port and the 3rd liquid sucting port successively; The first liquid port, the second liquid port and the 3rd liquid port are uniformly distributed along the circumference, and the first liquid sucting port, the second liquid sucting port and the 3rd liquid sucting port are uniformly distributed along the circumference; The first impeller is fixed on output shaft; The first described impeller and the second impeller are along the circumferential direction evenly equipped with three blades, the outer arced surface of every blade and the laminating of the inwall of pump case; Along the circumferential direction, the alternate setting of blade of the blade of the first impeller and the second impeller; All blade interior are all installed a unidirectional Decompression valves, and unidirectional Decompression valves direction is consistent with wheel rotation direction.
The first described oval noncircular gear and parameter and the structure of the second oval noncircular gear are in full accord, parameter and the structure of the oval noncircular gear of the first conjugation and the oval noncircular gear of the second conjugation are in full accord, and the first oval noncircular gear, the second oval noncircular gear, the oval noncircular gear of the first conjugation and the oval noncircular gear of the second conjugation are three rank noncircular gears; The initial installation phase difference of the initial installation phase difference of the first oval noncircular gear and the second oval noncircular gear, the oval noncircular gear of the first conjugation and the oval noncircular gear of the second conjugation is 60 °.
The pitch curve representation of the first oval noncircular gear is:
Wherein, n 1be the exponent number of the first oval noncircular gear, value is 3; A is oval major axis radius, k 1for oval eccentricity, be the corner of the first oval noncircular gear, it is the corresponding corner of the first oval noncircular gear radius vector.
The oval noncircular gear of the first oval noncircular gear and the first conjugation is three rank noncircular gears, according to the noncircular gear theory of engagement, when the first oval noncircular gear rotating 360 degrees, also rotating 360 degrees of the oval noncircular gear of the first conjugation, can calculate the iterative of centre distance a:
Get centre distance initial value a 0adopt the search of advance and retreat method to calculate the exact value of centre distance a.
The velocity ratio of the oval noncircular gear of the first oval noncircular gear and the first conjugation is:
Wherein, n 2be the exponent number of the oval noncircular gear of the first conjugation and the oval noncircular gear of the second conjugation, value is 3;
The velocity ratio of the oval noncircular gear of the second oval noncircular gear and the second conjugation is:
Wherein, θ is the phase difference of the first oval noncircular gear and the second oval noncircular gear, and value is 60 °.
Make the velocity ratio i of the oval noncircular gear of the first oval noncircular gear and the first conjugation 21equal the velocity ratio i of the oval noncircular gear of the second oval noncircular gear and the second conjugation 43, can try to achieve four different corners corner get minimum value time, the angular displacement of the first oval noncircular gear is the angular displacement of the second oval noncircular gear is the corner of the first impeller and the second impeller is respectively:
The blade angle θ of the first impeller and the second impeller leafvalue be 25 °~35 °; The central angle equal and opposite in direction of the first liquid port, the first liquid sucting port, the second liquid port, the second liquid sucting port, the 3rd liquid port and the 3rd liquid sucting port, and than the blade angle θ of blade leaflittle 2~5 °.The first liquid port centre bit angle setting of pump case the first liquid sucting port centre bit angle setting the second liquid port centre bit angle setting the second liquid sucting port centre bit angle setting the 3rd liquid port centre bit angle setting the 3rd liquid sucting port centre bit angle setting
The beneficial effect the utlity model has is:
The utility model adopts oval non-circular gear mechanism, oval non-circular gear pitch curve has six to adjust parameter, compare existing distortion eccentric circle noncircular gear adjustable parameter many, therefore oval noncircular gear variable speed transmission rule is easily adjusted, and easily realizes the optimization of the performances such as differential pump delivery, pressure, flow.By unidirectional Decompression valves is installed in blade, when pressure limit, get through contiguous enclosed cavity, effectively solve the tired liquid problem of existing differential pump.The differential pump liquid sucting port and the liquid port that drive due to oval non-circular gear mechanism are uniformly distributed along the circumference, and radial equilibrium is good, and non-constant speed transmission is for rotatablely moving, and therefore operate steadily reliably, radially work loads balance, the controllability of pulsing are good; Blade is many, discharge capacity is large, and internal surface and the blade shape of pump case are simple, and volumetric efficiency is high.
Core institution of the present utility model is two pairs of different oval noncircular gears that phase place is installed, and parts are few, compact structure.
Brief description of the drawings
Fig. 1 is kinematic sketch of mechanism of the present utility model;
Fig. 2 is the overall structure sectional view of differential pump parts in the utility model;
Fig. 3 is the meshing relation schematic diagram of oval non-circular gear pitch curve in the time of initial mounting point in the utility model;
Fig. 4 is blade limit position schematic diagram of the present utility model.
In figure: 1, driving gearbox, 2, input shaft, 3, output shaft, 4, the first oval noncircular gear, 5, the second oval noncircular gear, 6, the oval noncircular gear of the first conjugation, 7, the oval noncircular gear of the second conjugation, 8, axle sleeve, 9, coupling, 10, motor, 11, pump case, 11-1, the first liquid port, 11-2, the first liquid sucting port, 11-3, the second liquid port, 11-4, the second liquid sucting port, 11-5, the 3rd liquid port, 11-6, the 3rd liquid sucting port, 12, the first impeller, 13, the second impeller, 14, unidirectional Decompression valves.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
As illustrated in fig. 1 and 2, six blade differential pumps that oval noncircular gear drives comprise driver part and differential pump parts.
Driver part comprises driving gearbox 1, input shaft 2, output shaft 3, the first oval noncircular gear 4, the second oval noncircular gear 5, the oval noncircular gear 6 of the first conjugation, the oval noncircular gear 7 of the second conjugation and axle sleeve 8.Input shaft 2 and output shaft 3 are separately positioned on the two ends of gear-box 1; Input shaft 2 is by two bearings in the two side of driving gearbox 1, and motor 10, by coupling 9, power is passed to the oval noncircular gear 4 of input shaft 2, the first and the second oval noncircular gear 5 is all fixedly mounted on input shaft 2; The two ends of output shaft 3 respectively by bearings on the tank wall of driving gearbox 1 and pump case 11, the oval noncircular gear 6 of the first conjugation is fixedly mounted on output shaft 3, and engages with the first oval noncircular gear 4; The oval noncircular gear 7 of the second conjugation and the second impeller 13 are all cemented on axle sleeve 8, and axle sleeve 8 kinks are on output shaft 3, and the oval noncircular gear 7 of the second conjugation engages with the second oval noncircular gear 5.
Differential pump parts comprise pump case 11, the first impeller 12, the second impeller 13 and unidirectional Decompression valves 14.On pump case 11, along the circumferential direction offer successively the first liquid port 11-1, the first liquid sucting port 11-2, the second liquid port 11-3, the second liquid sucting port 11-4, the 3rd liquid port 11-5 and the 3rd liquid sucting port 11-6; The first liquid port 11-1, the second liquid port 11-3 and the 3rd liquid port 11-5 are uniformly distributed along the circumference, and the first liquid sucting port 11-2, the second liquid sucting port 11-4 and the 3rd liquid sucting port 11-6 are uniformly distributed along the circumference; The first impeller 12 is fixedly mounted on output shaft 3; The first impeller 12 and the second impeller 13 are along the circumferential direction evenly equipped with three blades, the inwall laminating of the outer arced surface of every blade and pump case 11; Along the circumferential direction, the alternate setting of blade of the blade of the first impeller 12 and the second impeller 13, all forms an enclosed cavity between every adjacent two blades; All blades are all provided with a unidirectional Decompression valves 14, and two of unidirectional Decompression valves 14 is communicated with the enclosed cavity of these blade both sides respectively; All unidirectional Decompression valves 14 directions are consistent with wheel rotation direction.
As shown in Figure 3, the structure of the first oval noncircular gear 4 and the second oval noncircular gear 5 is in full accord, the structure of the oval noncircular gear 6 of the first conjugation and the oval noncircular gear 7 of the second conjugation is in full accord, and the first oval noncircular gear 4, the second oval noncircular gear 5, the oval noncircular gear 6 of the first conjugation and the oval noncircular gear 7 of the second conjugation are three rank noncircular gears; The initial installation phase angle of the first oval noncircular gear 4 is θ 1, the initial installation phase angle of the second oval noncircular gear 5 is θ 2; The initial installation phase difference of the first oval noncircular gear 4 and the second oval noncircular gear 5, the oval noncircular gear 6 of the first conjugation and the oval noncircular gear 7 of the second conjugation is θ 12its value is 60 °, the differential of realizing the first impeller 12 and the second impeller 13 rotates, make the volume cyclically-varying of differential pump enclosed cavity, produce discharge opeing at the first liquid port 11-1, the second liquid port 11-3 and the 3rd liquid port 11-5, produce imbibition at the first liquid sucting port 11-2, the second liquid sucting port 11-4 and the 3rd liquid sucting port 11-6.Because the non-at the uniform velocity transmission of oval noncircular gear is continuous, at enclosed cavity, in complete when airtight, blade still has differential to rotate, and this will make enclosed cavity pressure exceed limit value, and vicinity enclosed cavity is got through pressure release by unidirectional Decompression valves 14, prevents from being stranded liquid.
The working principle of six blade differential pumps that this ellipse noncircular gear drives:
Motor 10 is passed to the first oval noncircular gear 4 and the second oval noncircular gear 5 by coupling 9 and input shaft 2 by power.The first oval noncircular gear 4 engages with the oval noncircular gear 6 of the first conjugation, the second oval noncircular gear 5 engages with the oval noncircular gear 7 of the second conjugation, the oval noncircular gear 6 of the first conjugation is passed to the first impeller 12 by power by output shaft 3, the oval noncircular gear 7 of the second conjugation is passed to the second impeller 13 by power by axle sleeve 8, axle sleeve 8 with the second conjugation ellipse noncircular gear 7 fixed and kink on output shaft 3.The installation phase place difference of two pairs of oval noncircular gear pairs, the differential of realizing the first impeller 12 and the second impeller 13 rotates, thereby realizes imbibition and discharge opeing.
The pitch curve representation of the first oval noncircular gear 4 is:
Wherein, n 1be the exponent number of the first oval noncircular gear, value is 3; A is oval major axis radius, and value is 100mm; k 1for oval eccentricity, value is 0.5; be the corner of the first oval noncircular gear, it is the corresponding corner of the first oval noncircular gear radius vector.
The oval noncircular gear 6 of the first oval noncircular gear 4 and the first conjugation is three rank noncircular gears, according to the noncircular gear theory of engagement, when the first oval noncircular gear 4 rotating 360 degrees, also rotating 360 degrees of the oval noncircular gear 6 of the first conjugation, can calculate the iterative of centre distance a:
Get centre distance initial value a 0=120mm, the exact value that adopts the search of advance and retreat method to calculate centre distance a is 120mm.
The velocity ratio of the oval noncircular gear of the first oval noncircular gear and the first conjugation is:
Wherein, n 2be the exponent number of the oval noncircular gear of the first conjugation and the oval noncircular gear of the second conjugation, value is 3;
The velocity ratio of the oval noncircular gear of the second oval noncircular gear and the second conjugation is:
Wherein, θ is the initial installation phase difference of the first oval noncircular gear and the second oval noncircular gear, and value is 60 °.
Make the velocity ratio i of the oval noncircular gear 6 of the first oval noncircular gear 4 and the first conjugation 21equal the velocity ratio i of the oval noncircular gear 7 of the second oval noncircular gear 5 and the second conjugation 43, can try to achieve four different corners corner get minimum value time, the angular displacement of the first oval noncircular gear 4 is °, the angular displacement of the second oval noncircular gear 5 is the corner of the first impeller 12 and the second impeller 13 is respectively:
As shown in Figure 4, the blade angle θ of the first impeller 12 and the second impeller 13 leafvalue be 30 °; The size of the first liquid port, the first liquid sucting port, the second liquid port, the second liquid sucting port, the 3rd liquid port and the 3rd liquid sucting port is all than the blade angle θ of blade leaflittle 2 °.The first liquid port centre bit angle setting of pump case the first liquid sucting port centre bit angle setting the second liquid port centre bit angle setting ψ row 2row 1+ 120 °=180 °, the second liquid sucting port centre bit angle setting ψ inhale 2inhale 1+ 120 °=211 °, the 3rd liquid port centre bit angle setting ψ row 3row 2+ 120 °=300 °, the 3rd liquid sucting port centre bit angle setting ψ inhale 3inhale 2+ 120 °=331 °.

Claims (1)

1. six blade differential pumps that oval noncircular gear drives, comprise driver part and differential pump parts, it is characterized in that:
Described driver part comprises driving gearbox, input shaft, output shaft, the first oval noncircular gear, the second oval noncircular gear, the oval noncircular gear of the first conjugation, the oval noncircular gear of the second conjugation and axle sleeve; Motor is connected with input shaft by coupling, and input shaft is the two side at driving gearbox by two bearings; Described the first oval noncircular gear and the second oval noncircular gear are all fixedly mounted on input shaft; The two ends of output shaft respectively by bearings on the tank wall of driving gearbox and pump case, the oval noncircular gear of the first conjugation is arranged on output shaft, and engages with the first oval noncircular gear; The oval noncircular gear of the second conjugation and the second impeller are all cemented on axle sleeve, and axle sleeve kink is on output shaft, and the oval noncircular gear of the second conjugation engages with the second oval noncircular gear;
Described differential pump parts comprise pump case, the first impeller, the second impeller and unidirectional Decompression valves; Described pump case along the circumferential direction offers the first liquid port, the first liquid sucting port, the second liquid port, the second liquid sucting port, the 3rd liquid port and the 3rd liquid sucting port successively; The first liquid port, the second liquid port and the 3rd liquid port are uniformly distributed along the circumference, and the first liquid sucting port, the second liquid sucting port and the 3rd liquid sucting port are uniformly distributed along the circumference; The first impeller is fixed on output shaft; The first described impeller and the second impeller are along the circumferential direction evenly equipped with three blades, the outer arced surface of every blade and the laminating of the inwall of pump case; Along the circumferential direction, the alternate setting of blade of the blade of the first impeller and the second impeller; All blade interior are all installed a unidirectional Decompression valves, and unidirectional Decompression valves direction is consistent with wheel rotation direction;
The first described oval noncircular gear and parameter and the structure of the second oval noncircular gear are in full accord, parameter and the structure of the oval noncircular gear of the first conjugation and the oval noncircular gear of the second conjugation are in full accord, and the first oval noncircular gear, the second oval noncircular gear, the oval noncircular gear of the first conjugation and the oval noncircular gear of the second conjugation are three rank noncircular gears; The initial installation phase difference of the initial installation phase difference of the first oval noncircular gear and the second oval noncircular gear, the oval noncircular gear of the first conjugation and the oval noncircular gear of the second conjugation is 60 °;
The pitch curve representation of the first oval noncircular gear is:
Wherein, n 1be the exponent number of the first oval noncircular gear, value is 3; A is oval major axis radius, k 1for oval eccentricity, be the corner of the first oval noncircular gear, it is the corresponding corner of the first oval noncircular gear radius vector;
The oval noncircular gear of the first oval noncircular gear and the first conjugation is three rank noncircular gears, according to the noncircular gear theory of engagement, when the first oval noncircular gear rotating 360 degrees, also rotating 360 degrees of the oval noncircular gear of the first conjugation, can calculate the iterative of centre distance a:
Get centre distance initial value a 0adopt the search of advance and retreat method to calculate the exact value of centre distance a;
The velocity ratio of the oval noncircular gear of the first oval noncircular gear and the first conjugation is:
Wherein, n 2be the exponent number of the oval noncircular gear of the first conjugation and the oval noncircular gear of the second conjugation, value is 3;
The velocity ratio of the oval noncircular gear of the second oval noncircular gear and the second conjugation is:
Wherein, θ is the phase difference of the first oval noncircular gear and the second oval noncircular gear, and value is 60 °;
Make the velocity ratio i of the oval noncircular gear of the first oval noncircular gear and the first conjugation 21equal the velocity ratio i of the oval noncircular gear of the second oval noncircular gear and the second conjugation 43, can try to achieve four different corners corner get minimum value time, the angular displacement of the first oval noncircular gear is the angular displacement of the second oval noncircular gear is the corner of the first impeller and the second impeller is respectively:
The blade angle θ of the first impeller and the second impeller leafvalue be 25 °~35 °; The equal and opposite in direction of the first liquid port, the first liquid sucting port, the second liquid port, the second liquid sucting port, the 3rd liquid port and the 3rd liquid sucting port, and than the blade angle θ of blade leaflittle 2~5 °; The first liquid port centre bit angle setting of pump case the first liquid sucting port centre bit angle setting the second liquid port centre bit angle setting the second liquid sucting port centre bit angle setting the 3rd liquid port centre bit angle setting the 3rd liquid sucting port centre bit angle setting
CN201420052515.1U 2014-01-27 2014-01-27 Elliptic non-circular gear-driven six-blade differential pump Withdrawn - After Issue CN203730297U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103742404A (en) * 2014-01-27 2014-04-23 浙江理工大学 Six-blade differential pump driven by elliptic non-circular gears

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103742404A (en) * 2014-01-27 2014-04-23 浙江理工大学 Six-blade differential pump driven by elliptic non-circular gears
CN103742404B (en) * 2014-01-27 2015-07-22 浙江理工大学 Six-blade differential pump driven by elliptic non-circular gears

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