CN1014345B - Bicorn rotator pump - Google Patents

Abstract

The present invention provides a basic structure of a bicorn rotor straight shaft pump. The present invention has the structural characteristic that single arc epitrochoid is a theoretical molded line of a cylinder body, and double arc inner envelope is a theoretical profile wire of a rotor. When a straight shaft at the eccentricity e point of the short warp direction of a deviation cylinder body away from the center of the cylinder body rotates through a key and a sliding block, the diagonal of a rotor always penetrates through the straight shaft and the shaft center and moves. The pump formed through the structure is much more compact than other rotor pumps. The working volume can be about 1/2 of the volume of the cylinder body and can be 7 times larger than that of an internal gear pump under the condition that outer rotor diameter is the same.

Description

Bicorn rotator pump

The present invention relates to the mechanism of a kind of Bicorn rotator pump, particularly two-angle rotor straight shaft pump.

In miscellaneous pump, in cylinder, realize all rotor pumps that swept volume changes by rotor do rotation motion, characteristics such as compact structure is simple, and volume is little, and is in light weight are more remarkable.However, under the condition that guarantees reliability in the spreadable life, further reduce the weight/power ratio (pump weight/pump displacement) of pump.Remain the target that we pursue.Particularly when the mechanism constituent element of it is heavy as some and volume is significant aspect, use field (for example motor etc.), all the more so.

Bicorn rotator pump aspect tight Minato of structure and weight/power ratio, is not that general rotor pump can be compared far.

At present, the Bicorn rotator pump that has is (the seeing patent of invention 86013333,7) of cycloid mechanism, and main shaft is a bent axle.The pump of this mechanism, the relation of cylinder shaped conductor and molded lines of rotor is geometric envelope relation.Inner chamber of cylinder block and rotor two drift angles on any position, all are in contact with one another simultaneously, have good principle sealing.But structure and complex process, not only main shaft is a d-axis, and needs one pair of inside engaged gear and pay device.

The Bicorn rotator pump that also has, as U. S. Patent the 3rd, 873, No. 245 disclosed.This pump comprises the housing of bringing outlet into, and housing is provided with cylindrical cavity, is installed in the chamber of described cylinder body always eccentric shaft, and prolongs away from this chamber; The rotor of installing on this d-axis is under it drives, and when rotating with respect to inner chamber of cylinder block, the chute by offering on rotor (3) makes rotor produce the pump that sliding movement forms with respect to d-axis simultaneously.This pump cylinder is columniform, and rotor is the cylindrical product that combines with throw of eccentric.This pump, the line segment that forms at two drift angles of rotor only, with the cylinder body major diameter that forms because of the axle center is eccentric when perpendicular, just has the sealing on the principle, in addition, be rotated on other any positions, rotor two summits all can not contact simultaneously with cylinder body, do not have the sealing reliability on the principle.

Purpose of the present invention provides a kind of two-angle rotor straight shaft pump.Claimed structure and technology are simple, and main shaft is not a camshaft but d-axis does not have the inside engaged gear device.Require the good airproof performance of inner chamber of cylinder block and rotor two drift angles; On any position, all be in contact with one another simultaneously, have good principle sealing.

Purpose is such realization: adopt single arc epitrochoid as the cylinder body theory shaped wire, envelope is as rotor theoretical contour (this rotor is a two-angle rotor) in two arcs, with the device drive rectangular shaped slider of a d-axis by key and so on, when allowing rotor on slide block, slide, the diagonal that guarantees rotor can intersect with the center line of d-axis all the time, and such rotor mechanism just can become the two-angle rotor straight shaft pump with above-mentioned key property.

Below in conjunction with accompanying drawing this pump structure and principle are made an explanation.

Fig. 1 is the cross-section profile of two-angle rotor straight shaft pump.

Fig. 2 is the profile diagram of two-angle rotor straight shaft pump.

Fig. 3 is a basic principle explanatory drawing of the present invention.

Fig. 4 is the partial enlarged drawing of relative motion relation among Fig. 3.

Fig. 1 is the cross-section profile of two-angle rotor straight shaft pump.Form the profile of cylinder body (2) by single arc epitrochoid.The import (1) of pump is arranged on the cylinder body (2).D-axis (6) drives slide block (8) rotation by key (5).Epitrochoidal interior envelope forms because rotor (3) profile is single arc, when slide block (8) rotation, rotor (3) is gone up at slide block (8) and is slided, and when its diagonal can move by the center of d-axis (6), according to geometrical relationship described below, we can know that two drift angles of rotor (3) are on any rotational position, can both contact with cylinder body (2) profile all the time, realize the variation of swept volume, liquid is sucked from import (1), and the outlet (10) from cylinder cap (11) is discharged.

But, position when rotor (3), in the process of rotation, be under the situation shown in Figure 1, the profile of rotor (3) can just will be ended in compression stroke, or the suction stroke alternate periods that just will begin, swept volume is divided into two spaces that are connected hardly (4 and 9), at this moment, the resistance of discharging or sucking liquid here may be bigger, can produce or increase the weight of pocketed oil and cavitation phenomenon.For eliminating or reducing the possibility that this phenomenon exists, a recessed part (7) can respectively be set on the both sides contoured surface of rotor (3), more free from worry with the UNICOM that guarantees two spaces (4 and 9).

In addition, in the following description, we know the slip of rotor (3) on cylinder body (2) profile in the running, in pump, there is liquid to do the environment of oiling agent, sliding scale is that to be dispersed in translation distance a be that the service wear that this structural feature is slowed down rotor (3) top provides advantageous conditions on the formed rotor of angle of oscillation (3) the top arc surface of radius.

Fig. 2 is the profile diagram of two-angle rotor straight shaft pump.Corresponding with Fig. 1, form by cylinder body (2) rotor (3), slide block (8), d-axis (6) and cylinder cap (11), (12).On the both sides contoured surface of rotor (3), a recessed part (7) is arranged respectively.

Can find out directly that according to Fig. 1 and Fig. 2 the swept volume of two-angle rotor straight shaft pump can be greatly to being about 1/2 of the own volume of cylinder body (2).This performance is that other rotor pumps are not available; Under the identical condition of cylinder diameter, the swept volume that its changes half-turn can be turn around about 8 times of swept volume of interior meshing gear pump.

Fig. 3 is basic principle explanation of the present invention.Circle (R) rolls along the fixedly circle (K) with its inscribe.The P point is for justifying (R) outward certain a bit.The distance of ordering to P in the center of circle (R) is generating radius R.E is two circle throw of eccentric.

If the center of circle zero k of fixing circle is the true origin of X and Y.

Pass between the radius K of the radius r of circle (R) and circle (K) is:

r∶K＝2∶1

Then:

e＝r-k＝K

α∶β＝2∶1

In the formula, α and β are respectively the corner of zero k, zero r corner and rolling circle (R).

With this understanding, when the P point rolled with circle (R), track L1 camber line was single arc epitrochoid.Its parametric equation:

X＝ecosα+Rcosα/2

Y＝esinα+Rsinα/2

The normal angle that generating radius R and camber line L1 go up arbitrarily any is:

${\mathrm{\phi \; =\; cos}}^{\mathrm{-1}}\frac{\mathrm{R+2eCOS\; a/\; 2}}{{\mathrm{(\; 4e}}^2{\mathrm{+\; R}}^2{\mathrm{+\; 4ReCOSa/\; 2\; )}}^{\mathrm{1/2}}}$

The outer equal space line of camber line L1 is L2.Its parametric equation:

X＝ecosα+Rcosα/2+αcos（φ+a/2）

Y＝esinα+Rsinα/2+αsin（φ+a/2）

In the formula, a is the equidistant value of L2 to L1, is a constant.

The interior envelope of camber line L1 is L3.

The interior envelope of outer equal space line L2 is L4.Its available circular arc by 3 of P1P ' P2 replaces in practice.

Fig. 4 justifies (R) and the partial enlarged drawing of justifying (K) relative motion relation among Fig. 3.It has proved the diagonal of two-angle rotor very simply, when rotor turns round, is justifying slip on the B point of (K) all the time.

The B point of circle on (K) is that two circles roll as yet relatively, and the A point on circle (K) and the circle (R) is on X-axis when tangent, at the point of contact of justifying on (K).This moment, generating radius R and X-axis overlapped.When circle (R) rolls, because α: β=2: 1, by relations such as between the geometric corresponding angles and exterior angle and non-conterminous interior angles, can know that generating radius R or its elongation line are under the situation of any numerical value at the β angle, all pass through the B point on the circle (K).And when rotor rotation one during week, length is that the rotor diagonal of 2R is 4e at the sliding scale of this point.Fig. 4 clearly illustrates that the position that B is ordered is on the X-axis of e apart from its center in the single arc epitrochoid minor axis direction of deflection.

If we are mapped the part in addition of the camber line among Fig. 3-Fig. 4 etc. and Fig. 1-Fig. 2, promptly outer equal space line L2 and the actual molded lines of cylinder body (2) are mapped, the real contour line of interior envelope L4 and rotor (3) is mapped, so, we just can obtain the basic structure of two-angle rotor straight shaft pump.

Right in addition, if the real contour line of interior envelope L4 and rotor (3) is mapped, so, can be the intersection point of two camber line L3 of Fig. 3 as the center, with translation distance α is radius, and removable wear-resisting straight pin or wear-resisting scraping blade are set, and can improve the wear resistance of rotor apex.

Claims (1)

1, a kind of Bicorn rotator pump, comprise cylinder body (2), described cylinder body (2) has formed inner chamber, cylinder cap (11), (12) of pump, import (1) and outlet (10) on cylinder body (2) and cylinder body (11), have been formed, one d-axis (6) is installed in the chamber of described cylinder body (2) prejudicially, and from this chamber, prolong away, this d-axis (6) is gone up the rotor (3) of installation under it drives, when rotating with respect to cylinder body (2) inner chamber, chute by on rotor (3), offering simultaneously, make rotor produce sliding movement, the invention is characterized in respect to d-axis (6):

The inner chamber theory shaped wire of a, described cylinder body (2) is single arc epitrochoid, and the ratio that forms the radius r of the radius K of the epitrochoidal fixedly circle of this list arc (K) and rolling circle (R) is 2: 1;

The theory shaped wire of b, described rotor (3) is an envelope in epitrochoidal pair of arc of above-mentioned single arc.

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