CN203730298U - Pascal non-circular gear-driven four-blade differential pump - Google Patents

Abstract

The utility model discloses a Pascal non-circular gear-driven four-blade differential pump. The existing differential pump has the problems of difficulty in optimizing pressure pulsation, liquid trapping and the like. A first Pascal non-circular gear and a second Pascal non-circular gear are respectively fixed to an input shaft; a first conjugate Pascal non-circular gear and a first impeller are respectively fixed to an output shaft, and the first conjugate Pascal non-circular gear meshes with the first Pascal non-circular gear; a second conjugate Pascal non-circular gear and a second impeller are fixed to a shaft sleeve, and the shaft sleeve is flexibly sheathed on the output shaft; the second conjugate Pascal non-circular gear meshes with the second Pascal non-circular gear; a pump casing is sequentially provided with a first liquid discharge port, a first liquid suction port, a second liquid discharge port and a second liquid suction port in the circumferential direction; 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. 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

The quaterfoil differential pump that Bath main officer of Tibet 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 Bath main officer of Tibet 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, the quaterfoil differential pump that provides a kind of Bath main officer of Tibet 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, 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 Bath main officer of Tibet noncircular gear, the second Bath main officer of Tibet noncircular gear, the first conjugation Bath main officer of Tibet noncircular gear, the second conjugation Bath main officer of Tibet noncircular gear and axle sleeve; Motor is connected with input shaft by coupling, and input shaft is the two side at driving gearbox by two bearings; The first described Bath main officer of Tibet noncircular gear and the second Bath main officer of Tibet 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 Bath main officer of Tibet noncircular gear is arranged on output shaft, and engages with the first Bath main officer of Tibet noncircular gear; The second conjugation Bath main officer of Tibet noncircular gear and the second impeller are all cemented on axle sleeve, and axle sleeve kink is on output shaft, and the second conjugation Bath main officer of Tibet noncircular gear engages with the second Bath main officer of Tibet 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, 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.

According to pump structure, the centre distance initial value a of given the first Bath main officer of Tibet noncircular gear and the first conjugation Bath main officer of Tibet 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:

According to the generating principle of Pascal curve, the pitch curve representation of the first Bath main officer of Tibet noncircular gear is:

Wherein, the generation circular diameter that b is Pascal curve, l is length, n ₁be the exponent number of the first Bath main officer of Tibet noncircular gear, value is 2; be the corner of the first Bath main officer of Tibet noncircular gear, it is the corresponding corner of the first Bath main officer of Tibet noncircular gear radius vector.

According to the noncircular gear theory of engagement, when the first Bath main officer of Tibet noncircular gear rotating 360 degrees, the angular displacement of the first conjugation Bath main officer of Tibet noncircular gear:

The first Bath main officer of Tibet noncircular gear and the first conjugation Bath main officer of Tibet noncircular gear are second order noncircular gear, therefore, and when the first Bath main officer of Tibet noncircular gear rotating 360 degrees, also rotating 360 degrees of the first conjugation Bath main officer of Tibet noncircular gear, 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 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.

The first described Bath main officer of Tibet noncircular gear and parameter and the structure of the second Bath main officer of Tibet noncircular gear are in full accord, parameter and the structure of the first conjugation Bath main officer of Tibet noncircular gear and the second conjugation Bath main officer of Tibet noncircular gear are in full accord, and the first Bath main officer of Tibet noncircular gear, the second Bath main officer of Tibet noncircular gear, the first conjugation Bath main officer of Tibet noncircular gear and the second conjugation Bath main officer of Tibet noncircular gear are second order noncircular gear; The initial installation phase difference of initial installation phase difference, the first conjugation Bath main officer of Tibet noncircular gear and the second conjugation Bath main officer of Tibet noncircular gear of the first Bath main officer of Tibet noncircular gear and the second Bath main officer of Tibet noncircular gear is 90 °.

The velocity ratio of the first Bath main officer of Tibet noncircular gear and the first conjugation Bath main officer of Tibet noncircular gear is:

The velocity ratio of the second Bath main officer of Tibet noncircular gear and the second conjugation Bath main officer of Tibet noncircular gear is:

Wherein, θ is the initial installation phase difference of the first Bath main officer of Tibet noncircular gear and the second Bath main officer of Tibet noncircular gear, and value is 90 °.

Make the velocity ratio i of the first Bath main officer of Tibet noncircular gear and the first conjugation Bath main officer of Tibet noncircular gear ₂₁equal the velocity ratio i of the second Bath main officer of Tibet noncircular gear and the second conjugation Bath main officer of Tibet noncircular gear ₄₃, can try to achieve four different corners corner get minimum value time, the angular displacement of the first Bath main officer of Tibet noncircular gear is the angular displacement of the second Bath main officer of Tibet 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 40 °～45 °; The central angle 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 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 minimum subtended angle of adjacent two blades now this enclosed cavity is minimum appearance

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

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:

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

Wherein, V is exhaust chamber volume; ω is the angular velocity of the first Bath main officer of Tibet noncircular gear and the second Bath main officer of Tibet noncircular gear, and its calculating formula is

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

$\begin{array}{c}\frac{{\mathrm{dp}}_1}{\mathrm{dt}}=\frac{K}{V_{\min }}\×q=\frac{K}{\mathrm{\Δ}{\mathrm{\Ψ}}_{\min }(R^2-r^2)}\×2\mathrm{h\ω}(R^2-r^2)|i_{21}-i_{43}|\\ \frac{{\mathrm{dp}}_2}{\mathrm{dt}}=\frac{K}{V_{\max }}\×q=\frac{K}{\mathrm{\Δ}{\mathrm{\Ψ}}_{\max }(R^2-r^2)}\×2\mathrm{h\ω}(R^2-r^2)|i_{21}-i_4|\end{array}$

The Young's modulus that wherein K is liquid.

The beneficial effect the utlity model has is:

The utility model adopts Bath main officer of Tibet non-circular gear mechanism, Bath main officer of Tibet non-circular gear pitch curve has six to adjust parameter, compare existing distortion eccentric circle noncircular gear adjustable parameter many, therefore Bath main officer of Tibet 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.Due to differential pump liquid sucting port and liquid port symmetry that Bath main officer of Tibet non-circular gear mechanism drives, 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 Bath main officer of Tibet 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 Bath main officer of Tibet 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;

Fig. 5 is instantaneous flow figure of the present utility model.

In figure: 1, driving gearbox, 2, input shaft, 3, output shaft, 4, the first Bath main officer of Tibet noncircular gear, 5, the second Bath main officer of Tibet noncircular gear, 6, the first conjugation Bath main officer of Tibet noncircular gear, 7, the second conjugation Bath main officer of Tibet 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, 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, the quaterfoil differential pump that Bath main officer of Tibet noncircular gear drives comprises driver part and differential pump parts.

Driver part comprises driving gearbox 1, input shaft 2, output shaft 3, the first Bath main officer of Tibet noncircular gear 4, the second Bath main officer of Tibet noncircular gear 5, the first conjugation Bath main officer of Tibet noncircular gear 6, the second conjugation Bath main officer of Tibet noncircular gear 7 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 input shaft 2, the first Bath main officer of Tibet noncircular gears 4 and the second Bath main officer of Tibet 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 first conjugation Bath main officer of Tibet noncircular gear 6 is fixedly mounted on output shaft 3, and engages with the first Bath main officer of Tibet noncircular gear 4; The second conjugation Bath main officer of Tibet 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 Bath main officer of Tibet noncircular gear 7 engages with the second Bath main officer of Tibet 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 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 fixedly mounted on output shaft 3; The first impeller 12 and the second impeller 13 are all symmetrically arranged with two 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 blade interior are all provided with a unidirectional Decompression valves 14, and unidirectional Decompression valves direction is consistent with wheel rotation direction.

As shown in Figure 3, parameter and the structure of the first Bath main officer of Tibet noncircular gear 4 and the second Bath main officer of Tibet noncircular gear 5 are in full accord, parameter and the structure of the first conjugation Bath main officer of Tibet noncircular gear 6 and the second conjugation Bath main officer of Tibet noncircular gear 7 are in full accord, and the first Bath main officer of Tibet noncircular gear 4, the second Bath main officer of Tibet noncircular gear 5, the first conjugation Bath main officer of Tibet noncircular gear 6 and the second conjugation Bath main officer of Tibet noncircular gear 7 are second order noncircular gear; The initial installation phase angle of the first Bath main officer of Tibet noncircular gear 4 is θ ₁, the initial installation phase angle of the second Bath main officer of Tibet noncircular gear 5 is θ ₂; The initial installation phase difference of the first Bath main officer of Tibet noncircular gear 4 and the second Bath main officer of Tibet noncircular gear 5, the first conjugation Bath main officer of Tibet noncircular gear 6 and the second conjugation Bath main officer of Tibet 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, produce discharge opeing at the first liquid port 11-1 and the second liquid port 11-3, produce imbibition at the first liquid sucting port 11-2 and the second liquid sucting port 11-4.Because the non-at the uniform velocity transmission of Bath main officer of Tibet 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 the quaterfoil differential pump that this Bath main officer of Tibet noncircular gear drives:

Motor 10 is passed to the first Bath main officer of Tibet noncircular gear 4 and the second Bath main officer of Tibet noncircular gear 5 by coupling 9 and input shaft 2 by power.The first Bath main officer of Tibet noncircular gear 4 engages with the first conjugation Bath main officer of Tibet noncircular gear 6, the second Bath main officer of Tibet noncircular gear 5 engages with the second conjugation Bath main officer of Tibet noncircular gear 7, the first conjugation Bath main officer of Tibet noncircular gear 6 is passed to the first impeller 12, the second conjugation Bath main officer of Tibet 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 difference of two pairs of Bath main officer of Tibet 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 pump structure, the centre distance initial value a of given the first Bath main officer of Tibet noncircular gear 4 and the first conjugation Bath main officer of Tibet 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:

According to the generating principle of Pascal curve, the pitch curve representation of the first Bath main officer of Tibet noncircular gear is:

Wherein, the generation circular diameter that b is Pascal curve, value is 60mm, and l is length, and value is 120mm; n ₁be the exponent number of the first Bath main officer of Tibet noncircular gear, value is 2; be the corner of the first Bath main officer of Tibet noncircular gear, it is the corresponding corner of the first Bath main officer of Tibet noncircular gear radius vector.

According to the noncircular gear theory of engagement, when the first Bath main officer of Tibet noncircular gear 4 rotating 360 degrees, the angular displacement of the first conjugation Bath main officer of Tibet noncircular gear 6:

The first Bath main officer of Tibet noncircular gear 4 and the first conjugation Bath main officer of Tibet noncircular gear 6 are second order noncircular gear, therefore, and when the first Bath main officer of Tibet noncircular gear 4 rotating 360 degrees, also rotating 360 degrees of the first conjugation Bath main officer of Tibet noncircular gear 6, can calculate the iterative of centre distance a:

Get centre distance initial value a ₀the exact value that=120mm adopts the search of advance and retreat method to calculate centre distance a is 267.8mm.

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 the first Bath main officer of Tibet noncircular gear 4 and the first conjugation Bath main officer of Tibet noncircular gear 6 is:

The velocity ratio of the second Bath main officer of Tibet noncircular gear 5 and the second conjugation Bath main officer of Tibet noncircular gear 7 is:

Wherein, θ is the initial installation phase difference of the first Bath main officer of Tibet noncircular gear and the second Bath main officer of Tibet noncircular gear, and value is 90 °.

Make the velocity ratio i of the first Bath main officer of Tibet noncircular gear 4 and the first conjugation Bath main officer of Tibet noncircular gear 6 ₂₁equal the velocity ratio i of the second Bath main officer of Tibet noncircular gear 5 and the second conjugation Bath main officer of Tibet noncircular gear 7 ₄₃, can try to achieve four different corners corner get minimum value time, the angular displacement of the first Bath main officer of Tibet noncircular gear 4 is =46 °, the angular displacement of the second Bath main officer of Tibet noncircular gear 5 are , 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 45 °; The central angle 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 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}+ 180 °=257.5 °, the second liquid sucting port centre bit angle setting ψ _{inhale 2}=ψ _{inhale 1}+ 180 °=328.5 °.

The minimum subtended angle Δ of adjacent two blades ψ _min=(ψ ₂+ 90 °)-(ψ ₁+ θ _leaf), 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 Δ of adjacent two blades ψ _max=(ψ ₁+ 180 °)-(ψ ₂+ 90 °+θ _leaf), 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=4997.49ml

The instantaneous flow calculation expression formula of quaterfoil differential pump:

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

Wherein, V is exhaust chamber volume; ω is the angular velocity of the first Bath main officer of Tibet noncircular gear 4 and the second Bath main officer of Tibet noncircular gear 5, and its calculating formula is the plotted curve of instantaneous flow as shown in Figure 5.

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

$\begin{array}{c}\frac{{\mathrm{dp}}_1}{\mathrm{dt}}=\frac{K}{V_{\min }}\×q=\frac{K}{\mathrm{\Δ}{\mathrm{\Ψ}}_{\min }(R^2-r^2)}\×2\mathrm{h\ω}(R^2-r^2)|i_{21}-i_{43}|\\ \frac{{\mathrm{dp}}_2}{\mathrm{dt}}=\frac{K}{V_{\max }}\×q=\frac{K}{\mathrm{\Δ}{\mathrm{\Ψ}}_{\max }(R^2-r^2)}\×2\mathrm{h\ω}(R^2-r^2)|i_{21}-i_4|\end{array}$

The Young's modulus that wherein K is liquid.

Change by the tired hydraulic coupling of minimum volume, maximum volume of calculating quaterfoil differential pump, 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.

Claims (4)

1. the quaterfoil differential pump that Bath main officer of Tibet 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, the first Bath main officer of Tibet noncircular gear, the second Bath main officer of Tibet noncircular gear, the first conjugation Bath main officer of Tibet noncircular gear, the second conjugation Bath main officer of Tibet noncircular gear and axle sleeve; Motor is connected with input shaft by coupling, and input shaft is the two side at driving gearbox by two bearings; The first described Bath main officer of Tibet noncircular gear and the second Bath main officer of Tibet 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 Bath main officer of Tibet noncircular gear is arranged on output shaft, and engages with the first Bath main officer of Tibet noncircular gear; The second conjugation Bath main officer of Tibet noncircular gear and the second impeller are all cemented on axle sleeve, and axle sleeve kink is on output shaft, and the second conjugation Bath main officer of Tibet noncircular gear engages with the second Bath main officer of Tibet 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, 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 all unidirectional Decompression valves directions are consistent with wheel rotation direction;

According to pump structure, the centre distance initial value a of given the first Bath main officer of Tibet noncircular gear and the first conjugation Bath main officer of Tibet 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:

According to the generating principle of Pascal curve, the pitch curve representation of the first Bath main officer of Tibet noncircular gear is:

Wherein, the generation circular diameter that b is Pascal curve, l is length, n ₁be the exponent number of the first Bath main officer of Tibet noncircular gear, value is 2; be the corner of the first Bath main officer of Tibet noncircular gear, it is the corresponding corner of the first Bath main officer of Tibet noncircular gear radius vector;

According to the noncircular gear theory of engagement, when the first Bath main officer of Tibet noncircular gear rotating 360 degrees, the angular displacement of the first conjugation Bath main officer of Tibet noncircular gear:

The first Bath main officer of Tibet noncircular gear and the first conjugation Bath main officer of Tibet noncircular gear are second order noncircular gear, therefore, and when the first Bath main officer of Tibet noncircular gear rotating 360 degrees, also rotating 360 degrees of the first conjugation Bath main officer of Tibet noncircular gear, 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 Bath main officer of Tibet 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.

3. the quaterfoil differential pump that Bath main officer of Tibet noncircular gear according to claim 1 drives, it is characterized in that: the first described Bath main officer of Tibet noncircular gear and parameter and the structure of the second Bath main officer of Tibet noncircular gear are in full accord, parameter and the structure of the first conjugation Bath main officer of Tibet noncircular gear and the second conjugation Bath main officer of Tibet noncircular gear are in full accord, and the first Bath main officer of Tibet noncircular gear, the second Bath main officer of Tibet noncircular gear, the first conjugation Bath main officer of Tibet noncircular gear and the second conjugation Bath main officer of Tibet noncircular gear are second order noncircular gear; The initial installation phase difference of initial installation phase difference, the first conjugation Bath main officer of Tibet noncircular gear and the second conjugation Bath main officer of Tibet noncircular gear of the first Bath main officer of Tibet noncircular gear and the second Bath main officer of Tibet noncircular gear is 90 °.

4. the quaterfoil differential pump that Bath main officer of Tibet noncircular gear according to claim 1 drives, is characterized in that: the velocity ratio of the first Bath main officer of Tibet noncircular gear and the first conjugation Bath main officer of Tibet noncircular gear is:

The velocity ratio of the second Bath main officer of Tibet noncircular gear and the second conjugation Bath main officer of Tibet noncircular gear is:

Wherein, θ is the initial installation phase difference of the first Bath main officer of Tibet noncircular gear and the second Bath main officer of Tibet noncircular gear, and value is 90 °;

Make the velocity ratio i of the first Bath main officer of Tibet noncircular gear and the first conjugation Bath main officer of Tibet noncircular gear ₂₁equal the velocity ratio i of the second Bath main officer of Tibet noncircular gear and the second conjugation Bath main officer of Tibet noncircular gear ₄₃, can try to achieve four different corners corner get minimum value time, the angular displacement of the first Bath main officer of Tibet noncircular gear is the angular displacement of the second Bath main officer of Tibet 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 40 °～45 °; The central angle 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 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 minimum subtended angle of adjacent two blades now this enclosed cavity is minimum

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

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:

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

Wherein, V is exhaust chamber volume; ω is the angular velocity of the first Bath main officer of Tibet noncircular gear and the second Bath main officer of Tibet noncircular gear, and its calculating formula is

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

$\begin{array}{c}\frac{{\mathrm{dp}}_1}{\mathrm{dt}}=\frac{K}{V_{\min }}\×q=\frac{K}{\mathrm{\Δ}{\mathrm{\Ψ}}_{\min }(R^2-r^2)}\×2\mathrm{h\ω}(R^2-r^2)|i_{21}-i_{43}|\\ \frac{{\mathrm{dp}}_2}{\mathrm{dt}}=\frac{K}{V_{\max }}\×q=\frac{K}{\mathrm{\Δ}{\mathrm{\Ψ}}_{\max }(R^2-r^2)}\×2\mathrm{h\ω}(R^2-r^2)|i_{21}-i_4|\end{array}$

The Young's modulus that wherein K is liquid.