CN101846072B - Egg shape conical gear pump - Google Patents

Abstract

The invention discloses an egg shape conical gear pump, comprising a pump case as well as a driving gear and a driven gear which are arranged in the pump case and are mutually meshed; wherein the driving gear and the driven gear are all egg shape conical gears and vertically intersected and meshed with the axis, the spherical large end face pitch curves of the driving gear and the driven gear are in egg shape. Compared with the existing gear pump, under the conditions of the same volume, the same rotating speed and the same working condition, the egg shape conical gear pump is greatly higher than the same type cylindrical gear pump and non-cylindrical gear pump in the aspects of average flow, instant flow and variable range thereof, the problem that radial force of gear pump is larger is overcome, pulse amplitude of force is reduced, transmission stationarity is good, vibration and noise are less, the working life of gear pump can be effectively prolonged, efficiency of pump is improved, and driving energy source is saved. The invention is applicable to application occasion with large delivery volume and large variable range.

Description

Egg shape conical gear pump

Technical field

The present invention relates to a kind of fluid pump, particularly a kind of egg shape conical gear pump.

Background technique

Gear pump is the positive displacement pump that a pair of pitch wheel and pumping cylinder form, and is divided into suction chamber and discharge side through pitch wheel in the pumping cylinder.When gear rotated, the suction chamber side gear teeth between cog volume of disengagement place each other increased gradually, and pressure reduces, and liquid gets between cog under differential pressure action.Along with the rotation of gear, the liquid of between cog is brought to discharge side one by one.At this moment the between cog volume of discharge side side wheel tooth engagement place dwindles gradually, and liquid is discharged.Gear pump is applicable to that conveying does not contain solid particle, non-corrosiveness, lubricity liquid that range of viscosities is bigger.The gear pump structure compact, easy to manufacture, easy to maintenance, suction capacity is arranged, but flow, pressure pulsation are big and noise is big, have harmful effect for pump itself.Particularly discharge capacity can't change basically, perhaps can among a small circle, regulate, and generally discharge capacity is less, makes the application area of gear pump receive restriction significantly.If desired than the gear pump of big flow, then need increase the volume and the rotating speed of gear pump, further increase running noises, cause the significant wastage of power.And during for the higher medium of transport viscosity, the rotating speed of pump improves and has certain restriction, influences the efficient of pump, causes the waste of the energy.

Therefore, need improve, reduce the pulsation of flow and pressure, reduce noise existing gear pump, and with the situation of existing gear pump equal volume and same rotational speed under, have bigger draining flow, the efficient of raising pump, saving driving source.

Summary of the invention

In view of this, the purpose of this invention is to provide a kind of egg shape conical gear pump, reduce the pulsation of power; Reduce noise, and with existing gear pump equal volume, same rotational speed and equal working condition under compare, have bigger draining flow; Improve the efficient of pump, practice thrift driving source.

Egg shape conical gear pump of the present invention comprises pump case, is arranged on intermeshing driving gear and driven gear in the pump case, and said driving gear and driven gear are egg shape conical gear and intersect vertical axis engagement, and the velocity ratio of driving gear and driven gear is:

The sphere large end face pitch curve of driving gear is avette, and equation is:

The sphere large end face pitch curve of driven gear also is avette, and equation does

R is a spherical radius in the equation, and k is an eccentricity, φ ₁Corner for driving gear.

Further, said pump case comprises at the bottom of the pump and top cover, at the bottom of the said pump internal surface respectively with driving gear and the little Spielpassung of driven gear small end face, the top cover internal surface respectively with the little Spielpassung of large end face of driving gear and driven gear; Said driving gear and driven gear are provided with gear shaft respectively in the circumferencial direction secure fit; The gear shaft of driven gear is rotatably assorted load at the bottom of the pump and between the top cover; Be rotatably assorted at the bottom of gear shaft one end of driving gear and the pump, the other end sealed rotational cooperates stretches out top cover;

Further, said top cover comprises driving gear top cover and the driven gear top cover that is tightly connected each other, and said driving gear top cover and driven gear top cover are tightly connected with at the bottom of the pump respectively;

Further, the small end face of said driving gear and driven gear is the sphere of indent, and driving gear and driven gear engagement back small end face and large end face form a sphere respectively; Internal surface is and the inwardly protruded sphere of driving gear and the little Spielpassung of driven gear small end face at the bottom of the said pump, and the driving gear top cover is connected the outer concave spherical surface of back internal surface formation and driving gear and the little Spielpassung of driven gear large end face with the driven gear top seal.

The invention has the beneficial effects as follows: egg shape conical gear pump of the present invention is provided with avette non-circular cone driving gear and avette non-circular cone driven gear and intersect vertical axis engagement at pump case; With existing gear pump contrast, under equal volume, same rotational speed and equal working condition, have bigger lifting rate, can increase substantially mean flowrate, instantaneous flow and range of variables, improve the efficient of pump, practice thrift driving source.Overcome the bigger problem of radial force of gear variable displacement pump, reduced the ripple amplitude of power, transmission stability is good, and vibration noise is little, can effectively prolong the operating life of gear pump.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention is further described.

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a gear engagement structural representation of the present invention;

Fig. 3 is a mean flowrate analysis chart of the present invention;

Fig. 4 is an instantaneous flow analysis chart of the present invention;

Fig. 5 is a gear fluid pressure analysis chart of the present invention;

Fig. 6 is common avette columnar tooth wheel pump and egg shape conical gear pump instantaneous flow comparison diagram;

Fig. 7 is egg shape conical gear and avette stud wheel hydraulic coupling comparison diagram.

Embodiment

Fig. 1 is a structural representation of the present invention; Fig. 2 is a gear engagement structural representation of the present invention; As shown in the figure: the egg shape conical gear pump of present embodiment; Comprise pump case, be arranged on intermeshing driving gear and driven gear in the pump case, said driving gear 1 is egg shape conical gear and intersect vertical axis engagement with driven gear 2, and the velocity ratio of driving gear and driven gear is:

The sphere large end face pitch curve of driving gear is avette, and equation is:

The sphere large end face pitch curve of driven gear also is avette, and equation does

R is a spherical radius in the equation, and k is an eccentricity, φ ₁Corner for driving gear.

In the present embodiment, said pump case comprises at the bottom of the pump 3 and top cover, at the bottom of the said pump 3 internal surfaces respectively with driving gear 1 and the little Spielpassung of driven gear 2 small end faces, the top cover internal surface respectively with the little Spielpassung of large end face of driving gear 1 and driven gear 2; Little Spielpassung refers between two fitting surfaces that the gap with minimum cooperates under the prerequisite that does not influence relative movement; Said driving gear 1 is provided with gear shaft (being respectively gear shaft 1a and gear shaft 2a among the figure) with driven gear 2 respectively in the circumferencial direction secure fit; The gear shaft 2a of driven gear 2 be rotatably assorted the load at the bottom of the pump 3 and top cover between; 3 are rotatably assorted at the bottom of gear shaft 1a one end of driving gear 1 and the pump; The other end sealed rotational cooperates stretches out top cover, is used for being connected with power source; Certainly, for easy for installation, structural stability, the gear shaft 2a of driven gear 2 also can the sealed rotational cooperation stretch out top cover.

In the present embodiment, said top cover comprises driving gear top cover 1b and the driven gear top cover 2b that is tightly connected each other, said driving gear top cover 1b and driven gear top cover 2b respectively with 3 be tightly connected at the bottom of the pump; As shown in Figure 1, between driving gear top cover 1b and the driven gear top cover 2b and driving gear top cover 1b and driven gear top cover 2b respectively and all add sealing gasket between 3 at the bottom of the pump and be fastenedly connected through bolt.

In the present embodiment, the large end face of said driving gear 1 and driven gear 2 is the sphere of evagination, and the small end face of driving gear 1 and driven gear 2 is the sphere of indent, and driving gear 1 forms a sphere respectively with driven gear 2 engagement back small end faces and large end face; 3 internal surfaces are and the inwardly protruded sphere of driving gear 1 and the little Spielpassung of driven gear 2 small end faces at the bottom of the said pump, and driving gear top cover 1b and driven gear top cover 2b are tightly connected, and the back internal surface forms and the outer concave spherical surface of driving gear 1 and the little Spielpassung of driven gear 2 large end faces; Because the particularity of non-cone gear; The intersection shape of the pump bottom structure and the two tooth top conical surfaces adapts; Can solve sealing problem to greatest extent like this; Realize the storage and the high-seal function of the liquid of concurrent aces gear pump, can promote the use of among cone gear pump and other the non-cone gear pumps.

The present invention can reduce the pulsation of power in use significantly, reduces running noises, and with the situation of existing gear pump equal volume and same rotational speed under have bigger draining flow, improve the efficient of pump, practice thrift driving source.

Fig. 3 is a mean flowrate analysis chart of the present invention, and is as shown in the figure, T ₁For egg shape conical gear driving wheel 1 holds pitch curve along arrow J greatly ₁Direction projection is to F ₁Face portion; T ₂For follower 2 holds pitch curves along arrow J greatly ₂Direction projection is to F ₂Face, half-twist is to face

Part.For making things convenient for flow analysis, T ₁And T ₂Formation Fig. 3 combines.

A pair of egg shape conical gear is two non-cone gears that are equal to.They return and circle, and liquid is full of the big end B of sphere along in the formed taper volume of the facewidth with 4 times.If spherical radius is R, area of arbitrary region is S on it, then has the volume of this regional formed cone to be: V=SR/3.

If the maximum pitch cone angle of gear 1 is ψ ₀, the big end radius of sphere is R ₁, the area of spherical surface of holding pitch curve greatly and being enclosed is S ₁, corresponding cone volume is V ₁The area of the spherical crown part that maximum pitch cone angle is corresponding does

The cone volume does

Pitch cone angle is ψ ₁The small end spherical radius is R ₂, the area of spherical surface that pitch curve enclosed is S ₂, corresponding cone volume V ₂The area of the spherical crown part that maximum pitch cone angle is corresponding does The cone volume

Then:

Facewidth B=R ₁-R ₂Can get by formula V=SR/3:

Discharge capacity $q=4\mathrm{\Δ\; V}=2[(V_1^{\′}-V_1)-(V_2^{\′}-V_2)]$

Average theory flow:

Wherein: i ₁₂---velocity ratio, and

ψ ₁---driving wheel pitch cone angle, and ψ ₁=arctan (1/i ₁₂);

φ ₁---the driving wheel corner;

N---driving wheel working speed;

η _v---the volumetric efficiency of gear pump.

Fig. 4 is an instantaneous flow analysis chart of the present invention, and is as shown in the figure, because a pair of egg shape conical gear about its geometrical center symmetry, only needs to analyze flow at the driving wheel corner (variation relation in 0～π) scope.And when driving wheel turned over 90 °, the angle position of driving wheel and follower was just in time exchanged, the state when promptly its instantaneous flow turns back to initial position.Therefore, only needing to analyze flow variation relation in driving wheel corner (0～pi/2) gets final product.

As shown in Figure 4, be research object with the big end sphere of two gears, M ₁Half the for all corresponding spherical crown areas of maximum pitch cone angle; M ₂Be the avette area of sphere; M ₃(or M ₄) turn over several angle φ for gear 1 (or 2) ₁(or φ ₂) after, folded of pump housing centre section and gear pitch curve (calculate for convenient, replace tip curve with pitch curve here);

(or

) turn over φ for gear 1 (or 2) ₁+ d φ ₁After the angle, folded of pump housing centre section and gear pitch curve.

Because the pump housing and gear all are that entity all is a fixed value, so M ₁, M ₂Also be that steady state value is constant.

$\mathrm{dM}=(M_3-M_3^{\′})-(M_4-M_4^{\′}),$ $\mathrm{dV}=\frac{{\mathrm{dM}}_1}{3}{R}_1-\frac{{\mathrm{dM}}_2}{3}{R}_2$

If instantaneous flow is Q _sThen:

That is: $Q_s=\frac{{\mathrm{\ω}}_1(R_1^3-R_2^3)}{3}[(1-\mathrm{Cos}{\mathrm{\ψ}}_0)(1+\frac{1}{i_{12}})-(1-\mathrm{Cos}\left({\mathrm{\ψ}}_1\right))-\frac{1}{i_{12}}(1-\mathrm{Cos}\left({\mathrm{\ψ}}_{\frac{\mathrm{\π}}{2}-{\mathrm{\φ}}_2}\right))]$

Wherein: i ₁₂---velocity ratio, and

ψ ₁---driving wheel pitch cone angle, and ψ ₁=arctan (1/i ₁₂);

- Active Wheel Pitch Angle right

The composite function;

φ ₁---the driving wheel corner;

φ ₂---the follower corner, and

ω ₁---driving wheel angular velocity;

ω ₂---follower angular velocity.

Because ω ₁, i ₁₂, ψ ₁,

φ ₂All be driving wheel corner φ ₁Function, so instantaneous flow Q _sBe the position function of driving wheel also, its cycle is π.

Can draw under equal working condition by above computational analysis: modulus m=2.5, number of teeth z=22, facewidth B=10mm, rotation speed n=1500r/min, addendum coefficient

The backlash coefficient

Volumetric efficiency η _v=0.9 and the pressure difference p=10Mpa of gear pump oil-discharging cavity and oil sucting cavity, and egg shape conical gear pump has identical transmission ratio function with the oval gear pump

It is as shown in the table to get numerical results according to the average theory flow formula.

1, average theory flow

Gear forms	The cylindrical gears pump	Avette stud wheel pump	Egg shape conical gear pump
				Average theory flow (mm 3/min)	1.1×10 7	3.0×10 7	7.8×10 7

It is thus clear that under the identical condition of operating mode, the average theory flow of egg shape conical gear pump is maximum, improved 7.1 times than the flow of the cylindrical gears pump equal conditions under, improved 2.6 times than avette stud wheel pump, the application of the big discharge capacity that suits especially.

2, instantaneous flow

Calculate formula according to instantaneous flow; In conjunction with example; The instantaneous flow correlation curve that gets egg shape conical gear pump and avette stud wheel pump is shown in Figure 6, and visible by Fig. 6, egg shape conical gear pump is consistent with the variation tendency of the instantaneous flow of avette stud wheel pump; The instantaneous flow of egg shape conical gear pump is higher than the instantaneous flow of avette stud wheel, and range of variables is greater than avette stud wheel pump.

Fig. 5 is a gear fluid pressure analysis chart of the present invention, and is as shown in the figure, and the suffered hydraulic coupling of egg shape conical gear pump is perpendicular to its pitch cone, and the hydraulic coupling of driving wheel 1 is analyzed as shown in the figure, establishes driving wheel and turns over angle φ ₁After, corresponding follower corner is φ ₂, then driving wheel 1 is at x, y, the component F on three directions of z _1x, F _1y, F _1zCalculate as follows respectively:

$F_{1x}=\mathrm{pB}\left(\frac{R_1+R_2}{2}\right)[\tan \left({\mathrm{\ψ}}_0\right)\cos \left({\mathrm{\ψ}}_0\right)\cos \left({\mathrm{\φ}}_1\right)+\tan \left({\mathrm{\ψ}}_1\right)]$

$F_{1y}=\mathrm{pB}\left(\frac{R_1+R_2}{2}\right)\tan \left({\mathrm{\ψ}}_0\right)\cos \left({\mathrm{\ψ}}_0\right)\sin \left({\mathrm{\φ}}_1\right)$

$F_{1z}=\mathrm{pB}\left(\frac{R_1+R_2}{2}\right)\tan \left({\mathrm{\ψ}}_0\right)\sin \left({\mathrm{\ψ}}_0\right)$

In like manner can get follower 2 at x, y, the component F on three directions of z _2x, F _2y, F _2zBe respectively:

$F_{2x}=\mathrm{pB}\left(\frac{R_1+R_2}{2}\right)[\tan \left({\mathrm{\ψ}}_0\right)\cos \left({\mathrm{\ψ}}_0\right)\sin \left({\mathrm{\φ}}_2\right)+\tan \left({\mathrm{\ψ}}_{{\mathrm{\φ}}_2}\right)]$

$F_{2y}=\mathrm{pB}\left(\frac{R_1+R_2}{2}\right)\tan \left({\mathrm{\ψ}}_0\right)\sin \left({\mathrm{\ψ}}_0\right)$

$F_{2z}=\mathrm{pB}\left(\frac{R_1+R_2}{2}\right)\tan \left({\mathrm{\ψ}}_0\right)\cos \left({\mathrm{\ψ}}_0\right)\sin \left({\mathrm{\φ}}_2\right).$

According to the analysis of hydraulic coupling, in conjunction with example, the hydraulic coupling correlation curve that gets egg shape conical gear pump and avette stud wheel pump driving wheel is as shown in Figure 7,

Visible by Fig. 7; The variation tendency of the X axle of egg shape conical gear pump and avette stud wheel pump and the power of Y axle is consistent, but egg shape conical gear pump is all less in the amplitude of variation of the power size of X axle and Y axle and power, and transmission stability is good; Vibration noise is little, can effectively prolong the operating life of gear pump.

Existing technology gear pump and parameter comparison table of the present invention:

Can know that by contrast table and Fig. 6 and Fig. 7 the variation relation of instantaneous flow and hydraulic coupling is following:

φ 1

0→90°

90°→180°

180°→270°

270°→360°

This shows that under the identical condition of operating mode, the range of variables of the instantaneous flow of egg shape conical gear pump is maximum, be higher than 1.4 times of the avette stud wheels of equal conditions, the suitable big application of range of variables that requires; All less than avette stud wheel pump, transmission stability is good in the amplitude of variation of the size of radial force and power for egg shape conical gear pump, and vibration noise is little, can effectively prolong the operating life of gear pump.

Explanation is at last; Above embodiment is only unrestricted in order to technological scheme of the present invention to be described; Although with reference to preferred embodiment the present invention is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technological scheme of the present invention; And not breaking away from the aim and the scope of technological scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.

Q s	Reduce	Increase	Reduce	Increase
					F x	Reduce	Reduce	Increase	Increase
F y	Increase	Reduce	Reduce	Increase

Claims (4)

1. egg shape conical gear pump; Comprise pump case, be arranged on intermeshing driving gear and driven gear in the pump case; It is characterized in that: said driving gear and driven gear are egg shape conical gear and intersect vertical axis engagement, and the velocity ratio of driving gear and driven gear is:

(0＜k＜1), the sphere large end face pitch curve of driving gear is avette, sphere large end face pitch curve equation is:

The sphere large end face pitch curve of driven gear also is avette, and sphere large end face pitch curve equation does

R is a spherical radius in the equation, and k is an eccentricity, φ ₁Corner for driving gear.

2. egg shape conical gear gear pump according to claim 1; It is characterized in that: said pump case comprises at the bottom of the pump and top cover; At the bottom of the said pump internal surface respectively with the little Spielpassung of small end face of driving gear and driven gear; The top cover internal surface respectively with the little Spielpassung of large end face of driving gear and driven gear, said little Spielpassung refers between two fitting surfaces that the gap with minimum cooperates under the prerequisite that does not influence relative movement; Said driving gear and driven gear are provided with gear shaft respectively in the circumferencial direction secure fit; The gear shaft of driven gear place at the bottom of the pump and between the top cover and be rotatably assorted with top cover at the bottom of the pump; Be rotatably assorted at the bottom of gear shaft one end of driving gear and the pump, the other end sealed rotational cooperates stretches out top cover.

3. egg shape conical gear pump according to claim 2 is characterized in that: said top cover comprises driving gear top cover and the driven gear top cover that is tightly connected each other, and said driving gear top cover and driven gear top cover are tightly connected with at the bottom of the pump respectively.

4. egg shape conical gear pump according to claim 3 is characterized in that: the small end face of said driving gear and driven gear is the sphere of indent, and driving gear and driven gear engagement back small end face and large end face form a sphere respectively; Internal surface is and the inwardly protruded sphere of driving gear and the little Spielpassung of driven gear small end face at the bottom of the said pump, and the driving gear top cover is connected the outer concave spherical surface of back internal surface formation and driving gear and the little Spielpassung of driven gear large end face with the driven gear top seal.

Images