CN203702542U - Six-blade differential pump driven by sinusoidal non-circular gears - Google Patents

Abstract

The utility model discloses a six-blade differential pump driven by sinusoidal non-circular gears. The power of the differential pump is output by a motor and then delivered to an input shaft via a coupler; the first sinusoidal non-circular gear and the second sinusoidal non-circular gear are fixed on the input shaft; the first conjugated sinusoidal non-circular gear is fixed on an output shaft, and engaged with the first sinusoidal non-circular gear; the second conjugated sinusoidal non-circular gear is fixedly connected with a second impeller via a shaft sleeve; the shaft sleeve is movably sleeved on the output shaft; the second conjugated sinusoidal non-circular gear is engaged with the second sinusoidal non-circular gear; a first impeller is fixed on the output shaft; each of the first impeller and the second impeller is provided with three blades; a one-way pressure release valve is mounted in each blade; and directions of the one-way pressure release valves are consistent with rotation directions of the blades. The differential pump is high in displacement, stable in flow and easy in non-uniform speed rule adjustment, and effectively solves the problems of pressure pulsation and fluid trapping of the traditional differential pump.

Description

Six blade differential pumps that sinusoidal 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 sinusoidal 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 sinusoidal noncircular gear to drive, and this blade differential pump displacement is large, pressure is high, stability of flow, compact structure; Sinusoidal 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 sinusoidal noncircular gear, the second sinusoidal noncircular gear, the sinusoidal noncircular gear of the first conjugation, the sinusoidal 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 sinusoidal noncircular gear and the second sinusoidal 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 sinusoidal noncircular gear of the first conjugation is fixedly mounted on output shaft, and engages with the first sinusoidal noncircular gear; The sinusoidal noncircular gear of the second conjugation and the second impeller are all cemented on axle sleeve, and axle sleeve kink is on output shaft; The sinusoidal noncircular gear of the second conjugation engages with the second sinusoidal 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 all uniformly distributed along the circumference and are provided with three blades; 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 blade rotation direction.

The first described sinusoidal noncircular gear and the structure of the second sinusoidal noncircular gear are in full accord, the structure of the sinusoidal noncircular gear of the first conjugation and the sinusoidal noncircular gear of the second conjugation is in full accord, and the first sinusoidal noncircular gear, the second sinusoidal noncircular gear, the sinusoidal noncircular gear of the first conjugation and the sinusoidal 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 sinusoidal noncircular gear and the second sinusoidal noncircular gear, the sinusoidal noncircular gear of the first conjugation and the sinusoidal noncircular gear of the second conjugation is 60 °.

According to the relation of sinusoidal gear pair, the corner of the first sinusoidal noncircular gear corner with the sinusoidal noncircular gear of the first conjugation meet relation:

Wherein, parameter n ₁be the exponent number of the first sinusoidal noncircular gear, value is 3; n ₂be the exponent number of the sinusoidal noncircular gear of the first conjugation, value is 3.

X ₁and y ₁meet relation:

Wherein, A is sinusoidal amplitude, and span is 0.001～0.01; Parameter the sinusoidal curve cycle $l=\frac{2\mathrm{\π}\sqrt{{n_1}^2+{n_2}^2}}{n_1{n}_2};$

The pitch curve representation of the first sinusoidal noncircular gear is:

The sinusoidal noncircular gear of the first sinusoidal noncircular gear and the first conjugation is three rank noncircular gears, according to the noncircular gear theory of engagement, when the first sinusoidal noncircular gear rotating 360 degrees, also rotating 360 degrees of the sinusoidal 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 sinusoidal noncircular gear of the first sinusoidal noncircular gear and the first conjugation is:

$i_{21}=\frac{\tan \left(\mathrm{\β}\right)+\mathrm{Ab}\cos \left({\mathrm{bx}}_1\right)}{1-\mathrm{Ab}\tan \left(\mathrm{\β}\right)\sin \left({\mathrm{bx}}_1\right)}$

The velocity ratio of the sinusoidal noncircular gear of the second sinusoidal noncircular gear and the second conjugation is:

$i_{43}=\frac{\tan \left(\mathrm{\β}\right)+\mathrm{Ab}\cos \left({\mathrm{bx}}_2\right)}{1-\mathrm{Ab}\tan \left(\mathrm{\β}\right)\sin \left({\mathrm{bx}}_2\right)}$

Wherein, θ is the initial installation phase difference of the first sinusoidal noncircular gear and the second sinusoidal noncircular gear, and value is 60 °.

Make the velocity ratio i of the sinusoidal noncircular gear of the first sinusoidal noncircular gear and the first conjugation ₂₁equal the velocity ratio i of the sinusoidal noncircular gear of the second sinusoidal 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 sinusoidal noncircular gear is the angular displacement of the second sinusoidal 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

The beneficial effect the utlity model has is:

The utility model adopts sinusoidal non-circular gear mechanism, sinusoidal non-circular gear pitch curve has six to adjust parameter, compare existing distortion eccentric circle noncircular gear adjustable parameter many, therefore sinusoidal 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 sinusoidal 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 sinusoidal noncircular gears that phase place is installed, and parts are few, compact structure.

Accompanying drawing explanation

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 sinusoidal 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 sinusoidal noncircular gear, 5, the second sinusoidal noncircular gear, 6, the sinusoidal noncircular gear of the first conjugation, 7, the sinusoidal 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 sinusoidal noncircular gear drives comprise driver part and differential pump parts.

Driver part comprises driving gearbox 1, input shaft 2, output shaft 3, the first sinusoidal noncircular gear 4, the second sinusoidal noncircular gear 5, the sinusoidal noncircular gear 6 of the first conjugation, the sinusoidal noncircular gear 7 of the second conjugation and axle sleeve 8.Motor 10 is passed to input shaft 2 through coupling 9 by power, and input shaft 2 is the two side at driving gearbox 1 by two bearings; The first sinusoidal noncircular gear 4 and the second sinusoidal noncircular gear 5 are 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 sinusoidal noncircular gear 6 of the first conjugation is fixedly mounted on output shaft 3, and engages with the first sinusoidal noncircular gear 4; The sinusoidal 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; The sinusoidal noncircular gear 7 of the second conjugation engages with the second sinusoidal noncircular gear 5;

Differential pump parts comprise pump case 11, the first impeller 12, the second impeller 13 and unidirectional Decompression valves 14; Pump case 11 along the circumferential direction offers 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 successively; 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 fixed on output shaft 3; The first impeller 12 and the second impeller 13 are all uniformly distributed along the circumference and are provided with three blades; Along the circumferential direction, the alternate setting of blade of the blade of the first impeller 12 and the second impeller 13; All blade interior are all installed a unidirectional Decompression valves 14, and unidirectional Decompression valves 14 directions are consistent with blade rotation direction.

As shown in Figure 3, the structure of the first sinusoidal noncircular gear 4 and the second sinusoidal noncircular gear 5 is in full accord, the structure of the sinusoidal noncircular gear 6 of the first conjugation and the sinusoidal noncircular gear 7 of the second conjugation is in full accord, and the first sinusoidal noncircular gear 4, the second sinusoidal noncircular gear 5, the sinusoidal noncircular gear 6 of the first conjugation and the sinusoidal noncircular gear 7 of the second conjugation are three rank noncircular gears; The initial installation phase angle of the first sinusoidal noncircular gear 4 is θ ₁, the initial installation phase angle of the second sinusoidal noncircular gear 5 is θ ₂; The initial installation phase difference of the first sinusoidal noncircular gear 4 and the second sinusoidal noncircular gear 5, the sinusoidal noncircular gear 6 of the first conjugation and the sinusoidal noncircular gear 7 of the second conjugation is θ ₁-θ ₂its 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 sinusoidal 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 sine noncircular gear drives:

Motor 10 is passed to the first sinusoidal noncircular gear 4 and the second sinusoidal noncircular gear 5 by coupling 9 and input shaft 2 by power.The first sinusoidal noncircular gear 4 engages with the sinusoidal noncircular gear 6 of the first conjugation, the second sinusoidal noncircular gear 5 engages with the sinusoidal noncircular gear 7 of the second conjugation, the sinusoidal noncircular gear 6 of the first conjugation is passed to the first impeller 12 by power by output shaft 3, the sinusoidal noncircular gear 7 of the second conjugation is passed to the second impeller 12 by power by axle sleeve 8, and sinusoidal noncircular gear 7 kinks of axle sleeve 8 and the second conjugation are on output shaft 3.The installation phase place difference of two offset of sinusoidal noncircular gear pairs, the differential of realizing the first impeller 12 and the second impeller 13 rotates, thereby realizes imbibition and discharge opeing.

According to the relation of sinusoidal gear pair, the corner of the first sinusoidal noncircular gear 4 corner with the sinusoidal noncircular gear 6 of the first conjugation meet relation:

Wherein, parameter n ₁be the exponent number of the first sinusoidal noncircular gear, value is 3; n ₂be the exponent number of the sinusoidal noncircular gear of the first conjugation, value is 3.

X ₁and y ₁meet relation:

Wherein, A is sinusoidal amplitude, and value is 0.004; Parameter the sinusoidal curve cycle $l=\frac{2\mathrm{\π}\sqrt{{n_1}^2+{n_2}^2}}{n_1{n}_2};$

The pitch curve representation of the first sinusoidal noncircular gear 4 is:

The sinusoidal noncircular gear 6 of the first sinusoidal noncircular gear 4 and the first conjugation is three rank noncircular gears, according to the noncircular gear theory of engagement, when the first sinusoidal noncircular gear 4 rotating 360 degrees, also rotating 360 degrees of the sinusoidal 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 121.8mm.

The velocity ratio of the sinusoidal noncircular gear 6 of the first sinusoidal noncircular gear 4 and the first conjugation is:

$i_{21}=\frac{\tan \left(\mathrm{\β}\right)+\mathrm{Ab}\cos \left({\mathrm{bx}}_1\right)}{1-\mathrm{Ab}\tan \left(\mathrm{\β}\right)\sin \left({\mathrm{bx}}_1\right)}$

The velocity ratio of the sinusoidal noncircular gear 7 of the second sinusoidal noncircular gear 5 and the second conjugation is:

$i_{43}=\frac{\tan \left(\mathrm{\β}\right)+\mathrm{Ab}\cos \left({\mathrm{bx}}_2\right)}{1-\mathrm{Ab}\tan \left(\mathrm{\β}\right)\sin \left({\mathrm{bx}}_2\right)}$

Wherein, θ is the initial installation phase difference of the first sinusoidal noncircular gear 4 and the second sinusoidal noncircular gear 5, and value is 60 °.

Make the velocity ratio i of the sinusoidal noncircular gear 6 of the first sinusoidal noncircular gear 4 and the first conjugation ₂₁equal the velocity ratio i of the sinusoidal noncircular gear 7 of the second sinusoidal 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 sinusoidal noncircular gear 4 is the angular displacement of the second sinusoidal 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 2}=ψ _{row 1}+ 120 °=167 °, the second liquid sucting port centre bit angle setting ψ _{inhale 2}=ψ _{inhale 1}+ 120 °=202.7 °, the 3rd liquid port centre bit angle setting ψ _{row 3}=ψ _{row 2}+ 120 °=287 °, the 3rd liquid sucting port centre bit angle setting ψ _{inhale 3}=ψ _{inhale 2}+ 120 °=322.7 °.

Claims (1)

1. six blade differential pumps that sinusoidal 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 sinusoidal noncircular gear, the second sinusoidal noncircular gear, the sinusoidal noncircular gear of the first conjugation, the sinusoidal 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 sinusoidal noncircular gear and the second sinusoidal 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 sinusoidal noncircular gear of the first conjugation is fixedly mounted on output shaft, and engages with the first sinusoidal noncircular gear; The sinusoidal noncircular gear of the second conjugation and the second impeller are all cemented on axle sleeve, and axle sleeve kink is on output shaft; The sinusoidal noncircular gear of the second conjugation engages with the second sinusoidal 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 all provided with three blades along circumferentially uniform; 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 blade rotation direction;

The first described sinusoidal noncircular gear and the structure of the second sinusoidal noncircular gear are in full accord, the structure of the sinusoidal noncircular gear of the first conjugation and the sinusoidal noncircular gear of the second conjugation is in full accord, and the first sinusoidal noncircular gear, the second sinusoidal noncircular gear, the sinusoidal noncircular gear of the first conjugation and the sinusoidal 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 sinusoidal noncircular gear and the second sinusoidal noncircular gear, the sinusoidal noncircular gear of the first conjugation and the sinusoidal noncircular gear of the second conjugation is 60 °;

According to the relation of sinusoidal gear pair, the corner of the first sinusoidal noncircular gear corner with the sinusoidal noncircular gear of the first conjugation meet relation:

Wherein, parameter n ₁be the exponent number of the first sinusoidal noncircular gear, value is 3; n ₂be the exponent number of the sinusoidal noncircular gear of the first conjugation, value is 3;

X ₁and y ₁meet relation:

Wherein, A is sinusoidal amplitude, and span is 0.001～0.01; Parameter the sinusoidal curve cycle

The pitch curve representation of the first sinusoidal noncircular gear is:

The sinusoidal noncircular gear of the first sinusoidal noncircular gear and the first conjugation is three rank noncircular gears, according to the noncircular gear theory of engagement, when the first sinusoidal noncircular gear rotating 360 degrees, also rotating 360 degrees of the sinusoidal 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 sinusoidal noncircular gear of the first sinusoidal noncircular gear and the first conjugation is:

The velocity ratio of the sinusoidal noncircular gear of the second sinusoidal noncircular gear and the second conjugation is:

Wherein, θ is the initial installation phase difference of the first sinusoidal noncircular gear and the second sinusoidal noncircular gear, and value is 60 °;

Make the velocity ratio i of the sinusoidal noncircular gear of the first sinusoidal noncircular gear and the first conjugation ₂₁equal the velocity ratio i of the sinusoidal noncircular gear of the second sinusoidal 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 sinusoidal noncircular gear is the angular displacement of the second sinusoidal 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