CN203730300U - Fourier non-circular gear-driven four-blade differential pump - Google Patents

Abstract

The utility model discloses a Fourier non-circular gear-driven four-blade differential pump. Power is output by a motor and transmitted to the input shaft through a coupling; a first Fourier non-circular gear and a second Fourier non-circular gear are respectively fixed to the input shaft; a first conjugate Fourier non-circular gear is fixed to the output shaft and meshes with the first Fourier non-circular gear; a second conjugate Fourier non-circular gear and a second impeller are fixed through a shaft sleeve, and the shaft sleeve is flexibly sheathed on the output shaft; the second conjugate Fourier non-circular gear meshes with the second Fourier non-circular gear; a first impeller is fixed to the output shaft; the first impeller and second impeller are respectively provided with two blades; and the inside of each blade is provided with a one-way relief valve which has the same rotation direction as the blade. The differential pump has the advantages of large discharge capacity, stable flow rate and adjustable non-uniform velocity rules, and effectively solves the problems of pressure pulsation and liquid trapping in the traditional differential pump.

Description

The quaterfoil differential pump that Fourier's noncircular gear drives

Technical field

The utility model belongs to displacement pump technical field, relates to blade differential pump, is specifically related to the quaterfoil differential pump that a kind of Fourier's 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 when multi-cylinder, but complex structure; Roller pump delivery is uniformly when 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 problems such as pressure pulsation, tired liquid.

Summary of the invention

The purpose of this utility model is for the deficiencies in the prior art, the quaterfoil differential pump that provides a kind of Fourier's noncircular gear to drive, and this blade differential pump displacement is large, pressure is high, stability of flow, compact structure; The variable speed rule of driving mechanism is easily adjusted, convenient function optimization; By unidirectional Decompression valves is installed in blade, during 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, first Fourier's noncircular gear, second Fourier's noncircular gear, the first conjugation Fourier noncircular gear, the second conjugation Fourier noncircular gear and axle sleeve.Motor drives input shaft to rotate, and input shaft is the two side at driving gearbox by two bearings; Described first Fourier's noncircular gear and second Fourier's 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 first conjugation Fourier noncircular gear is fixedly mounted on output shaft, and with the first Fourier's noncircular gear engagement; The second conjugation Fourier noncircular gear and the second impeller are all cemented on axle sleeve, and axle sleeve kink is on output shaft; The second conjugation Fourier noncircular gear and the engagement of second Fourier's 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 and the second liquid sucting port successively; The first impeller is fixed on output shaft; The first described impeller and the second impeller are all symmetrically arranged with two 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.

According to pump structure, the centre distance initial value a of given first Fourier's noncircular gear and the first conjugation Fourier noncircular gear ₀, then according to pitch curve sealing condition and meshing condition, adopt the search of advance and retreat method to obtain the exact value of centre distance a.Specifically be calculated as follows:

The pitch curve representation of first Fourier's noncircular gear is:

Wherein, a ₁, a ₂, b ₁and b ₂for the parameter of Fourier's function, a ₁span is 1～6, a ₂span is 1～3, b ₁span is 0～2.3, b ₂span is that 0～2.3, n is the exponent number of first Fourier's noncircular gear, and value is 2; be the corner of first Fourier's noncircular gear, it is the corresponding corner of first Fourier's noncircular gear radius vector.

According to the noncircular gear theory of engagement, during first Fourier's noncircular gear rotating 360 degrees, the angular displacement of the first conjugation Fourier noncircular gear:

First Fourier's noncircular gear and the first conjugation Fourier noncircular gear are second order noncircular gear, and therefore, during first Fourier's noncircular gear rotating 360 degrees, the first conjugation Fourier noncircular gear is rotating 360 degrees also, 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.

Described input shaft and output shaft are separately positioned on the two ends of gear-box; One end head of described input shaft stretches out outside driving gearbox and is connected with motor by coupling.

Described the first liquid port and the second liquid port are symmetrical arranged, and the first liquid sucting port and the second liquid sucting port are symmetrical arranged.

All unidirectional Decompression valves directions are consistent with blade rotation direction.

First described Fourier's noncircular gear and the structure of second Fourier's noncircular gear are in full accord, the structure of the first conjugation Fourier noncircular gear and the second conjugation Fourier noncircular gear is in full accord, and first Fourier's noncircular gear, second Fourier's noncircular gear, the first conjugation Fourier noncircular gear and the second conjugation Fourier noncircular gear are second order noncircular gear; The initial installation phase difference of the initial installation phase difference of first Fourier's noncircular gear and second Fourier's noncircular gear, the first conjugation Fourier noncircular gear and the second conjugation Fourier noncircular gear is 90 °.

The velocity ratio of first Fourier's noncircular gear and the first conjugation Fourier noncircular gear is:

The velocity ratio of second Fourier's noncircular gear and the second conjugation Fourier noncircular gear is:

Wherein, θ is the initial installation phase difference of first Fourier's noncircular gear and second Fourier's noncircular gear, and value is 90 °.

Make the velocity ratio i of first Fourier's noncircular gear and the first conjugation Fourier noncircular gear ₂₁equal the velocity ratio i of second Fourier's noncircular gear and the second conjugation Fourier noncircular gear ₄₃, can try to achieve four different corners corner get minimum value time, the angular displacement of first Fourier's noncircular gear is the angular displacement of second Fourier's noncircular gear is the corner of the first impeller and the second impeller is respectively:

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}+ π, the second liquid sucting port centre bit angle setting ψ _{inhale 2}=ψ _{inhale 1}+ π; The equal and opposite in direction of the first liquid port, the first liquid sucting port, the second liquid port and the second liquid sucting port, and than the blade angle θ of blade _leaflittle 2～5 °; The blade angle θ of the first impeller and the second impeller _leafvalue be 40 °～45 °.

The minimum subtended angle of adjacent two blades now this enclosed cavity is minimum volume:

$V_{\min }=\frac{\mathrm{\Δ}{\mathrm{\ψ}}_{\min }}{2}(R^2-r^2)\×h\×{10}^{-6}$

Wherein, R is blade radius, and r is impeller shaft radius, and h is vane thickness.

The maximum subtended angle of adjacent two blades now this enclosed cavity is maximum volume:

$V_{\max }=\frac{\mathrm{\Δ}{\mathrm{\ψ}}_{\max }}{2}(R^2-r^2)\×h\×{10}^{-6}$

The discharge capacity account representation of quaterfoil differential pump:

Q＝4×(V _max-V _min)＝2(Δψ _max-Δψ _min)(R ²-r ²)×h×10 ^-6

The instantaneous flow calculation expression formula of quaterfoil differential pump:

$q=\frac{\mathrm{dV}}{\mathrm{dt}}=2h(R^2-r^2)|\frac{d{\mathrm{\ψ}}_1}{\mathrm{dt}}-\frac{d{\mathrm{\ψ}}_2}{\mathrm{dt}}|=2\mathrm{h\ω}(R^2-r^2)|i_{21}-i_{43}|$

Wherein, V is exhaust chamber volume; ω is the angular velocity of first Fourier's noncircular gear and second Fourier's noncircular gear, and its calculating formula is

The minimum volume of quaterfoil differential pump, the tired hydraulic coupling change calculations representation of maximum volume:

$\frac{{\mathrm{dp}}_1}{\mathrm{dt}}=\frac{K}{V_{\min }}\×q=\frac{K}{\mathrm{\Δ}{\mathrm{\ψ}}_{\min }(R^2-r^2)}\×2\mathrm{h\ω}(R^2-r^2)|i_{21}-i_{43}|$

$\frac{{\mathrm{dp}}_2}{\mathrm{dt}}=\frac{K}{V_{\max }}\×q=\frac{K}{\mathrm{\Δ}{\mathrm{\ψ}}_{\max }(R^2-r^2)}\×2\mathrm{h\ω}(R^2-r^2)|i_{21}-i_{43}|$

The Young's modulus that wherein K is liquid.

The beneficial effect the utlity model has is:

The utility model adopts Fourier's non-circular gear mechanism, Fourier's non-circular gear pitch curve has six to adjust parameter, compare existing distortion eccentric circle noncircular gear adjustable parameter many, therefore Fourier's 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, during pressure limit, get through contiguous enclosed cavity, effectively solve the tired liquid problem of existing differential pump.Because differential pump liquid sucting port and liquid port that Fourier's non-circular gear mechanism drives are symmetrical, radial equilibrium is good, and non-constant speed transmission is for rotatablely moving, and therefore operates 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 Fourier's 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 Fourier's noncircular gear when initial mounting point in the utility model;

Fig. 4 is blade limit position schematic diagram of the present utility model;

Instantaneous flow figure when Fig. 5-1 is the utility model discharge capacity maximum;

Fourier's non-circular gear pitch curve engagement figure when Fig. 5-2 are the utility model discharge capacity maximum;

Fig. 6-1 is the utility model discharge capacity instantaneous flow figure hour;

Fig. 6-2 are the utility model discharge capacity Fourier's non-circular gear pitch curve engagement figure hour;

Instantaneous flow figure when Fig. 7-1 is used for many parallels connection of pumps for the utility model;

Fourier's non-circular gear pitch curve engagement figure when Fig. 7-2 are used for many parallels connection of pumps for the utility model.

In figure: 1, driving gearbox, 2, input shaft, 3, output shaft, 4, first Fourier's noncircular gear, 5, second Fourier's noncircular gear, the 6, first conjugation Fourier noncircular gear, 7, the second conjugation Fourier noncircular gear, 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, 12, the first impeller, the 13, second impeller, 14, unidirectional one-way valve.

Embodiment

Below in conjunction with drawings and Examples, the utility model is described in further detail.

As illustrated in fig. 1 and 2, the quaterfoil differential pump that Fourier's noncircular gear drives comprises driver part and differential pump parts.

Driver part comprises driving gearbox 1, input shaft 2, output shaft 3, first Fourier's noncircular gear 4, second Fourier's noncircular gear 5, the first conjugation Fourier noncircular gear 6, the second conjugation Fourier noncircular gear 7 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; First Fourier's noncircular gear 4 and second Fourier's 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 first conjugation Fourier noncircular gear 6 is fixedly mounted on output shaft 3, and with first Fourier's noncircular gear 4 engagement; The second conjugation Fourier noncircular gear 7 and the second impeller 13 are all cemented on axle sleeve 8, and axle sleeve 8 kinks are on output shaft 3; The second conjugation Fourier noncircular gear 7 and second Fourier's noncircular gear 5 engagements.

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 and the second liquid sucting port 11-4 successively; The first liquid port 11-1 and the second liquid port 11-3 are symmetrical arranged, and the first liquid sucting port 11-2 and the second liquid sucting port 11-4 are symmetrical arranged; The first impeller 12 is fixed on output shaft 3; The first impeller 12 and the second impeller 13 are all symmetrically arranged with two 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 first Fourier's noncircular gear 4 and second Fourier's noncircular gear 5 is in full accord, the structure of the first conjugation Fourier noncircular gear 6 and the second conjugation Fourier noncircular gear 7 is in full accord, and first Fourier's noncircular gear 4, second Fourier's noncircular gear 5, the first conjugation Fourier noncircular gear 6 and the second conjugation Fourier noncircular gear 7 are second order noncircular gear; The initial installation phase angle of first Fourier's noncircular gear 4 is θ ₁, the initial installation phase angle of second Fourier's noncircular gear 5 is θ ₂; The initial installation phase difference of first Fourier's noncircular gear 4 and second Fourier's noncircular gear 5, the first conjugation Fourier noncircular gear 6 and the second conjugation Fourier noncircular gear 7 is θ ₁-θ ₂its value is 90 °, and the differential of realizing the first impeller 12 and the second impeller 13 rotates, and makes the volume cyclically-varying of differential pump enclosed cavity, at the first liquid port 11-1 and the second liquid port 11-3, produce discharge opeing, at the first liquid sucting port 11-2 and the second liquid sucting port 11-4, produce imbibition.Because the non-at the uniform velocity transmission of Fourier's noncircular gear is continuous, at enclosed cavity, in complete when airtight, blade still has differential to rotate, and this will make enclosed cavity pressure surpass limit value, and unidirectional Decompression valves 14 is got through pressure release by vicinity enclosed cavity, prevents from being stranded liquid.

The working principle of the quaterfoil differential pump that this Fourier's noncircular gear drives:

Motor 10 is passed to first Fourier's noncircular gear 4 and second Fourier's noncircular gear 5 by coupling 9 and input shaft 2 by power.First Fourier's noncircular gear 4 and the first conjugation Fourier noncircular gear 6 engagements, second Fourier's noncircular gear 5 and the second conjugation Fourier noncircular gear 7 engagements, the first conjugation Fourier noncircular gear 6 is passed to the first impeller 12, the second conjugation Fourier noncircular gears 7 by power by output shaft 3 power is passed to the second impeller 13 by axle sleeve 8.The installation phase place of two pairs of Fourier's noncircular gear pairs is different, and the differential of realizing the first impeller 12 and the second impeller 13 rotates, thereby realizes imbibition and discharge opeing.

According to pump structure, the centre distance initial value a of given first Fourier's noncircular gear 4 and the first conjugation Fourier noncircular gear 6 ₀, then according to pitch curve sealing condition and meshing condition, adopt the search of advance and retreat method to obtain the exact value of centre distance a.Specifically be calculated as follows:

The pitch curve representation of first Fourier's noncircular gear 4 is:

Wherein, a ₁, a ₂, b ₁and b ₂for the parameter of Fourier's function, n is the exponent number of first Fourier's noncircular gear 4, and value is 2; be the corner of first Fourier's noncircular gear 4, it is the corresponding corner of first Fourier's noncircular gear 4 radius vector.

According to the noncircular gear theory of engagement, during first Fourier's noncircular gear 4 rotating 360 degrees, the angular displacement of the first conjugation Fourier noncircular gear 6:

First Fourier's noncircular gear 4 and the first conjugation Fourier noncircular gear 6 are second order noncircular gear, and therefore, during first Fourier's noncircular gear 4 rotating 360 degrees, the first conjugation Fourier noncircular gear 6 is rotating 360 degrees also, 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.

Try to achieve after the exact value of centre distance a, can solve row, the liquid sucting port central position of pump case, quaterfoil differential pump delivery, instantaneous flow and minimum volume, the tired hydraulic coupling of maximum volume change representation.Specifically be calculated as follows:

The velocity ratio of first Fourier's noncircular gear 4 and the first conjugation Fourier noncircular gear 6 is:

The velocity ratio of second Fourier's noncircular gear 5 and the second conjugation Fourier noncircular gear 7 is:

Wherein, θ is the initial installation phase difference of first Fourier's noncircular gear 4 and second Fourier's noncircular gear 5, and value is 90 °.

Make the velocity ratio i of first Fourier's noncircular gear 4 and the first conjugation Fourier noncircular gear 6 ₂₁equal the velocity ratio i of second Fourier's noncircular gear 5 and the second conjugation Fourier noncircular gear 7 ₄₃, can try to achieve four different corners corner get minimum value time, the angular displacement of first Fourier's noncircular gear 4 is the angular displacement of second Fourier's noncircular gear 5 is the corner of the first impeller 12 and the second impeller 13 is respectively:

As shown in Figure 4, 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}+ π, the second liquid sucting port centre bit angle setting ψ _{inhale 2}=ψ _{inhale 1}+ π; The size of the first liquid port, the first liquid sucting port, the second liquid port and the second liquid sucting port is all than the blade angle θ of blade _leaflittle 2 °; The blade angle θ of the first impeller 12 and the second impeller 13 _leafvalue be 45 °.

The minimum subtended angle of adjacent two blades now this enclosed cavity is minimum volume:

$V_{\min }=\frac{\mathrm{\Δ}{\mathrm{\ψ}}_{\min }}{2}(R^2-r^2)\×h\×{10}^{-6}$

Wherein, R is blade radius, and value is 90mm; R is impeller shaft radius, and value is 20mm; H is vane thickness, and value is 50mm.

The maximum subtended angle of adjacent two blades now this enclosed cavity is maximum volume:

$V_{\max }=\frac{\mathrm{\Δ}{\mathrm{\ψ}}_{\max }}{2}(R^2-r^2)\×h\×{10}^{-6}$

The discharge capacity account representation of quaterfoil differential pump:

Q＝4×(V _max-V _min)＝2(Δψ _max-Δψ _min)(R ²-r ²)×h×10 ^-6

The instantaneous flow calculation expression formula of quaterfoil differential pump:

$q=\frac{\mathrm{dV}}{\mathrm{dt}}=2h(R^2-r^2)|\frac{d{\mathrm{\ψ}}_1}{\mathrm{dt}}-\frac{d{\mathrm{\ψ}}_2}{\mathrm{dt}}|=2\mathrm{h\ω}(R^2-r^2)|i_{21}-i_{43}|$

Wherein, V is exhaust chamber volume; ω is the angular velocity of first Fourier's noncircular gear 4 and second Fourier's noncircular gear 5, and its calculating formula is

The minimum volume of quaterfoil differential pump, the tired hydraulic coupling change calculations representation of maximum volume:

$\frac{{\mathrm{dp}}_1}{\mathrm{dt}}=\frac{K}{V_{\min }}\×q=\frac{K}{\mathrm{\Δ}{\mathrm{\ψ}}_{\min }(R^2-r^2)}\×2\mathrm{h\ω}(R^2-r^2)|i_{21}-i_{43}|$

$\frac{{\mathrm{dp}}_2}{\mathrm{dt}}=\frac{K}{V_{\max }}\×q=\frac{K}{\mathrm{\Δ}{\mathrm{\ψ}}_{\max }(R^2-r^2)}\×2\mathrm{h\ω}(R^2-r^2)|i_{21}-i_{43}|$

The Young's modulus that wherein K is liquid.

By calculating the tired hydraulic coupling of minimum volume, maximum volume of quaterfoil differential pump, change, can be the unidirectional Decompression valves of selecting in blade reference is provided, be generally used for the CLV ceiling limit value of determining unidirectional Decompression valves.

As shown in Fig. 5-1 and 5-2, in the pitch curve representation of first Fourier's noncircular gear 4, the parameter of Fourier's function is a ₁=5.025, a ₂=2.568, b ₁=0.013, b ₂the exponent number n=2 of=0.013, first Fourier's noncircular gear 4, centre distance initial value a ₀=15mm, can try to achieve centre distance a is 32.3mm, the corner of first Fourier's noncircular gear 4 obtain 46 ° of minimum value, now, the angular displacement of first Fourier's noncircular gear 4 be 46 °, the angular displacement of second Fourier's noncircular gear 5 be 136 °, the corner ψ of the first impeller 12 ₁be 64 °, the corner ψ of the second impeller 13 ₂be 115 °, the first liquid port centre bit angle setting ψ _{row 1}be 86.5 °, the first liquid sucting port centre bit angle setting ψ _{inhale 1}be 137.5 °, the second liquid port centre bit angle setting ψ _{row 2}be 266.5 °, the second liquid sucting port centre bit angle setting ψ _{inhale 2}it is 317.5 °.Under this parameter, quaterfoil differential pump delivery is maximum, its value is 10305.9ml, obviously, all there is obvious indent in the pitch curve of first Fourier's noncircular gear 4, second Fourier's noncircular gear 5, the first conjugation Fourier noncircular gear 6 and the second conjugation Fourier noncircular gear 7 in now instantaneous flow pulsation.

As shown in Fig. 6-1 and 6-2, in the pitch curve representation of first Fourier's noncircular gear 4, the parameter of Fourier's function is a ₁=2, a ₂=2.568, b ₁=0.013, b ₂the exponent number n=2 of=0.013, first Fourier's noncircular gear 4, centre distance initial value a ₀=20mm, can try to achieve centre distance a is 40.5mm, the corner of first Fourier's noncircular gear 4 obtain 46 ° of minimum value, now, the angular displacement of first Fourier's noncircular gear 4 be 46 °, the angular displacement of second Fourier's noncircular gear 5 be 136 °, the corner ψ of the first impeller 12 ₁be 51 °, the corner ψ of the second impeller 13 ₂be 128 °, the first liquid port centre bit angle setting ψ _{row 1}be 73.5 °, the first liquid sucting port centre bit angle setting ψ _{inhale 1}be 150.5 °, the second liquid port centre bit angle setting ψ _{row 2}be 253.5 °, the second liquid sucting port centre bit angle setting ψ _{inhale 2}it is 330.5 °.Under this parameter, quaterfoil differential pump delivery is minimum, its value is 3318.25ml, and now air-quantity chart is mild, and the pitch curve of first Fourier's noncircular gear 4, second Fourier's noncircular gear 5, the first conjugation Fourier noncircular gear 6 and the second conjugation Fourier noncircular gear 7 all has indent.

As shown in Fig. 7-1 and 7-2, in the pitch curve representation of first Fourier's noncircular gear 4, the parameter of Fourier's function is a ₁=6, a ₂=2, b ₁=0.013, b ₂the exponent number n=2 of=0.013, first Fourier's noncircular gear 4, centre distance initial value a ₀=20mm, can try to achieve centre distance a is 42.1mm, the corner of first Fourier's noncircular gear 4 obtain 46 ° of minimum value, now, the angular displacement of first Fourier's noncircular gear 4 be 46 °, the angular displacement of second Fourier's noncircular gear 5 be 136 °, the corner ψ of the first impeller 12 ₁be 62 °, the corner ψ of the second impeller 13 ₂be 118 °, the first liquid port centre bit angle setting ψ _{row 1}be 84.5 °, the first liquid sucting port centre bit angle setting ψ _{inhale 1}be 140.5 °, the second liquid port centre bit angle setting ψ _{row 2}be 264.5 °, the second liquid sucting port centre bit angle setting ψ _{inhale 2}it is 320.5 °.Under this parameter, quaterfoil differential pump delivery is 9123.91ml, now air-quantity chart top is milder than bottom, be applicable to many parallels connection of pumps, the pitch curve indent of first Fourier's noncircular gear 4, second Fourier's noncircular gear 5, the first conjugation Fourier noncircular gear 6 and the second conjugation Fourier noncircular gear 7 is not obvious, can obtain good gear transmission characteristic and quaterfoil differential pump performance.

Claims (6)

1. the quaterfoil differential pump that Fourier's noncircular gear drives, comprises driver part and differential pump parts, it is characterized in that:

Described driver part comprises driving gearbox, input shaft, output shaft, first Fourier's noncircular gear, second Fourier's noncircular gear, the first conjugation Fourier noncircular gear, the second conjugation Fourier noncircular gear and axle sleeve; Motor drives input shaft to rotate, and input shaft is the two side at driving gearbox by two bearings; Described first Fourier's noncircular gear and second Fourier's 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 first conjugation Fourier noncircular gear is fixedly mounted on output shaft, and with the first Fourier's noncircular gear engagement; The second conjugation Fourier noncircular gear and the second impeller are all cemented on axle sleeve, and axle sleeve kink is on output shaft; The second conjugation Fourier noncircular gear and the engagement of second Fourier's 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 and the second liquid sucting port successively; The first impeller is fixed on output shaft; The first described impeller and the second impeller are all symmetrically arranged with two 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;

According to pump structure, the centre distance initial value a of given first Fourier's noncircular gear and the first conjugation Fourier noncircular gear ₀, then according to pitch curve sealing condition and meshing condition, adopt the search of advance and retreat method to obtain the exact value of centre distance a; Specifically be calculated as follows:

The pitch curve representation of first Fourier's noncircular gear is:

Wherein, a ₁, a ₂, b ₁and b ₂for the parameter of Fourier's function, a ₁span is 1～6, a ₂span is 1～3, b ₁span is 0～2.3, b ₂span is that 0～2.3, n is the exponent number of first Fourier's noncircular gear, and value is 2; be the corner of first Fourier's noncircular gear, it is the corresponding corner of first Fourier's noncircular gear radius vector;

According to the noncircular gear theory of engagement, during first Fourier's noncircular gear rotating 360 degrees, the angular displacement of the first conjugation Fourier noncircular gear:

First Fourier's noncircular gear and the first conjugation Fourier noncircular gear are second order noncircular gear, and therefore, during first Fourier's noncircular gear rotating 360 degrees, the first conjugation Fourier noncircular gear is rotating 360 degrees also, 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.

2. the quaterfoil differential pump that Fourier's noncircular gear according to claim 1 drives, is characterized in that: described input shaft and output shaft are separately positioned on the two ends of gear-box; One end head of described input shaft stretches out outside driving gearbox and is connected with motor by coupling.

3. the quaterfoil differential pump that Fourier's noncircular gear according to claim 1 drives, is characterized in that: described the first liquid port and the second liquid port are symmetrical arranged, and the first liquid sucting port and the second liquid sucting port are symmetrical arranged.

4. the quaterfoil differential pump that Fourier's noncircular gear according to claim 1 drives, is characterized in that: all unidirectional Decompression valves directions are consistent with blade rotation direction.

5. the quaterfoil differential pump that Fourier's noncircular gear according to claim 1 drives, it is characterized in that: first described Fourier's noncircular gear and the structure of second Fourier's noncircular gear are in full accord, the structure of the first conjugation Fourier noncircular gear and the second conjugation Fourier noncircular gear is in full accord, and first Fourier's noncircular gear, second Fourier's noncircular gear, the first conjugation Fourier noncircular gear and the second conjugation Fourier noncircular gear are second order noncircular gear; The initial installation phase difference of the initial installation phase difference of first Fourier's noncircular gear and second Fourier's noncircular gear, the first conjugation Fourier noncircular gear and the second conjugation Fourier noncircular gear is 90 °.

6. the quaterfoil differential pump that Fourier's noncircular gear according to claim 1 drives, is characterized in that: the velocity ratio of first Fourier's noncircular gear and the first conjugation Fourier noncircular gear is:

The velocity ratio of second Fourier's noncircular gear and the second conjugation Fourier noncircular gear is:

Wherein, θ is the initial installation phase difference of first Fourier's noncircular gear and second Fourier's noncircular gear, and value is 90 °;

Make the velocity ratio i of first Fourier's noncircular gear and the first conjugation Fourier noncircular gear ₂₁equal the velocity ratio i of second Fourier's noncircular gear and the second conjugation Fourier noncircular gear ₄₃, can try to achieve four different corners corner get minimum value time, the angular displacement of first Fourier's noncircular gear is the angular displacement of second Fourier's noncircular gear is the corner of the first impeller and the second impeller is respectively:

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}+ π, the second liquid sucting port centre bit angle setting ψ _{inhale 2}=ψ _{inhale 1}+ π; The equal and opposite in direction of the first liquid port, the first liquid sucting port, the second liquid port and the second liquid sucting port, and than the blade angle θ of blade _leaflittle 2～5 °; The blade angle θ of the first impeller and the second impeller _leafvalue be 40 °～45 °;

The minimum subtended angle of adjacent two blades now this enclosed cavity is minimum volume:

$V_{\min }=\frac{\mathrm{\Δ}{\mathrm{\ψ}}_{\min }}{2}(R^2-r^2)\×h\×{10}^{-6}$

Wherein, R is blade radius, and r is impeller shaft radius, and h is vane thickness;

The maximum subtended angle of adjacent two blades now this enclosed cavity is maximum volume:

$V_{\max }=\frac{\mathrm{\Δ}{\mathrm{\ψ}}_{\max }}{2}(R^2-r^2)\×h\×{10}^{-6}$

The discharge capacity account representation of quaterfoil differential pump:

Q＝4×(V _max-V _min)＝2(Δψ _max-Δψ _min)(R ²-r ²)×h×10 ^-6

The instantaneous flow calculation expression formula of quaterfoil differential pump:

$q=\frac{\mathrm{dV}}{\mathrm{dt}}=2h(R^2-r^2)|\frac{d{\mathrm{\ψ}}_1}{\mathrm{dt}}-\frac{d{\mathrm{\ψ}}_2}{\mathrm{dt}}|=2\mathrm{h\ω}(R^2-r^2)|i_{21}-i_{43}|$

Wherein, V is exhaust chamber volume; ω is the angular velocity of first Fourier's noncircular gear and second Fourier's noncircular gear, and its calculating formula is

The minimum volume of quaterfoil differential pump, the tired hydraulic coupling change calculations representation of maximum volume:

$\frac{{\mathrm{dp}}_1}{\mathrm{dt}}=\frac{K}{V_{\min }}\×q=\frac{K}{\mathrm{\Δ}{\mathrm{\ψ}}_{\min }(R^2-r^2)}\×2\mathrm{h\ω}(R^2-r^2)|i_{21}-i_{43}|$

$\frac{{\mathrm{dp}}_2}{\mathrm{dt}}=\frac{K}{V_{\max }}\×q=\frac{K}{\mathrm{\Δ}{\mathrm{\ψ}}_{\max }(R^2-r^2)}\×2\mathrm{h\ω}(R^2-r^2)|i_{21}-i_{43}|$

The Young's modulus that wherein K is liquid.