CN1904365B - Designing method of claw type rotor - Google Patents

Abstract

There is disclosed a design method of claw rotors, which is used for designing defined rotors conjugate engaged each other and conjugate rotors. Taking the parameterization definition of the motion curvilinears of an ineffective compression to a beginning of the air-intaking and start to end of exhausting of two rotors estimates and seeks out the optimum performance of the rotor. When the rotor designed by the present invention is for use in a vacuum pump, a compressor, a supercharger and the like, it can provide a higher compression ratio and a transfer volume.

Description

Designing method of claw type rotor

Technical field

The present invention relates to a kind of designing method of claw type rotor, is additional patent application (the Continuation In Part of No. the 6th, 776,594, U. S. Patent relatively of No. the 220027th, the novel patent No. of TaiWan, China; CIP), this method can be with the definition rotor and the conjugation rotor of mutual conjugation engagement, the invalid Motion curves that is compressed to the beginning air inlet with four parameter-definition two rotors, and exhaust begins to the Motion curves of termination, thereby assessment is also obtained best rotor performance, and can be applied to vacuum pump, air compressor, compressor, pressurized machine etc., has higher compression ratios and delivery volume to provide, and make that the inlet and outlet movement process is smooth and easy, can not produce the effect of noise and vibrations.

Background technique

Be applied to multistage Shandong formula compressor, vacuum pump, claw rotor on air compressor or the pressurized machine, comprise substantially: two intermeshing definition rotors and conjugation rotor, and be respectively equipped with the blade that is meshed on this two rotor, be meshing with each other rotation so that advancing of periodic cycle to be provided by two blades, the exhaust compression movement, therefore, two blades engagement property is extremely important, if two being meshing with each other property of blade are not good then in air inlet, exhaust, the Periodic Rotating process of not having compression just can produce noise and vibrations, and the abrasion that also can cause two rotors to be produced because of engagement improperly, and reduce working life.

The structure of known associated rotor can be with reference to U. S. Patent case the 1st, 426,820,4,138,848,4,224,016,4,324,538,4,406,601,4,430,050 and 5,149, No. 256 etc., two rotors 8 of the 5th, 149, No. 256 wherein, 9 blade, as shown in Figure 8, in recess 80,90 and cambered surface 81,91 jointing place forms tip 82,92, and makes whole rotor 80,90 curve forms discontinuous in this tip 82,92, thereby, when its from invalid be compressed to the beginning air inlet process the time, the tip portion 83 of rotor 8,9,93 just can have some setbacks smoothly in these tip 82,92 runnings, and have the phenomenon generation of noise and vibrations.Same case, aforementioned other U. S. Patent case also exist running to have some setbacks in the two rotor start processes that are meshed, and the phenomenon of noise and vibrations is arranged.

No. 220027 (U.S. the 6th of the novel patent of TaiWan, China before this case, 776, No. 594 patent cases), proposed to solve the flaw of above-mentioned known technology, that is, in the invalid stage that is compressed to the beginning air inlet of two rotors, and exhaust began to the stage of termination,, rather than form through smooth connection with two different curves by the handing-over of two circular arcs.Therefore, can make two rotors not have the phenomenon generation of noise and vibrations in the process of running.

Summary of the invention

The purpose of this invention is to provide a kind of designing method of claw type rotor, this method can be with the invalid Motion curves that is compressed to the beginning air inlet of intermeshing definition rotor and conjugation rotor, and exhaust begins to the Motion curves of termination, obtain with the different parameters definition, thereby assessment is also obtained best rotor performance, and can be applied to vacuum pump, air compressor, compressor, pressurized machine of actual demand etc., have higher compression delivery volume when to provide, and guarantee that two rotors do not have the phenomenon generation of noise and vibrations in the process of running.

For this reason, the present invention proposes a kind of designing method of claw type rotor, this method is used to make the definition rotor and the conjugation rotor of mutual conjugation engagement, design the body and the blade of the definition rotor that comprises curve E, circular arc A, circular arc B, circular arc F, circular arc C, straight line Y with parametrization, and form the conjugation rotor with conjugate curve by described curve and circular arc, this method comprises: forms definition rotor step and forms conjugation rotor step, wherein:

This formation definition rotor step comprises:

Specify definition rotor maximum radius R, the width D of definition rotor, definition rotor and the Pitch radius Rp of conjugation rotor and the center of circle t1 of this two pitch circle, t3, this two centre of pitch circle distance is 2Rp, Rp is less than R, and R and Rp the two a proper proportion is arranged;

Get the center of circle of the center of circle t1 of pitch circle,, and on this horizontal line h1, obtain 1 P by a horizontal line h1 as the definition rotor ₀, this P ₀With the horizontal equivalent of center of circle t1 be R, by this P ₀Produce conjugate curve E ' around pitch circle center of circle t1, curve E ' is with respect to two pitch circle intersection point P ₁Symmetrical curve E, get the blade part of this curve E as rotor.The intersection point P of this curve E on horizontal line h1 ₃

By the central angle alpha of this horizontal line h1 and definition rotor center of circle t1, another P of decision definition rotor motion curve ₁, connect aforementioned some P ₀With P ₁Can obtain the circular arc A of definition rotor contour, and be connected with curve E is smooth-going;

On the contained side h2 of this central angle alpha, obtain the second centre point t2, and try to achieve the radius r of the second centre point t2 via the trigonometric function relation _B, then can obtain a circular arc B another part, and obtain two end points P of this circular arc B as the appearance curve of definition rotor ₁With P ₂, and some P ₂Vertical position above the t2 of the center of circle;

The center of circle t1 that goes up with respect to definition rotor pitch circle in this horizontal line h1 gets the centre point of 1 t3 as conjugation rotor pitch circle, and the horizontal equivalent of t3 and t1 is 2Rp, then defines 1 P of another appearance curve of rotor ₄Can connect aforementioned some P by determining with radius R and specified central angle β by conjugation rotor center of circle t3 ₃With a P ₄Can obtain another appearance curve circular arc F of definition rotor;

On the contained side h3 of this central angle β, obtain the 4th centre point t4, and try to achieve the radius r of the 4th centre point t4 via the trigonometric function relation _C, then can obtain a circular arc C another part, and obtain two end point P of this circular arc C as the appearance curve of definition rotor ₄With a P ₅, and some P ₅Vertical position below the t4 of the center of circle;

Tie point P ₂An and P ₅Symmetric points P ₆Formed horizontal linear Y; Connect the appearance curve that above-mentioned curve E, circular arc A, circular arc B, circular arc F, circular arc C, straight line Y etc. form definition rotor 1 monodactyle, the appearance curve of another pawl becomes symmetric relation with the above-mentioned curve that respectively defines relatively, so for defining the body appearance curve of rotor;

This forms conjugation rotor step, is after utilizing the profile of above-mentioned steps decision definition rotor, to be made up of the conjugate curve that respectively define curve in the definition rotor again.

Description of drawings

Fig. 1 forms the schematic representation of end points conjugate curve for designing method of claw type rotor of the present invention.

Fig. 2 forms the schematic representation of definition rotor profile for designing method of claw type rotor of the present invention.

Fig. 3 is that 60mm, definition rotor width D are that 85mm, central angle alpha are that 3 degree, central angle β are the schematic representation of the application examples of 6 degree for designing method of claw type rotor of the present invention wherein defines rotor maximum radius R.

Fig. 4 forms the schematic representation of conjugation rotor profile for designing method of claw type rotor of the present invention.

Fig. 5 is 52,55,60,65,75 for the thickness D of definition rotor in the designing method of claw type rotor of the present invention, the schematic representation that the definition rotor profile changes during 80mm.

Fig. 6 for designing method of claw type rotor of the present invention wherein central angle alpha be 3,6,9,12 to spend the schematic representation that time definition rotor profile changes.

Fig. 73,6,9,12 spends the schematic representation that time definition rotor profile changes for designing method of claw type rotor central angle β of the present invention.

Fig. 8 is the different numerical value with the blade of conjugation rotor of the resultant definition rotor of variant parameter among tabular Fig. 4,6,7.

Fig. 9 is a U. S. Patent the 5th, 149, No. 256 planimetric map.

Description of reference numerals:

Definition rotor 1 conjugation rotor 2 maximum radius R

Definition rotor width D Pitch radius Rp straight line Y

Center of circle t1, t2, t3, t4 horizontal line h1, h2, h3, h4

Point P ₀, P ₁, P ₂, P ₃, P ₄, P ₅, P ₆, P ₇Central angle alpha, β

Radius r _B, r _CCurve E, E ' circular arc A, B, C, F

Embodiment

Designing method of claw type rotor of the present invention is the profile that obtains definition rotor 1 earlier, obtains the profile of conjugation rotor 2 again with conjugate curve, sees also Fig. 1,2, and the profile of this definition rotor 1 obtains and comprises the steps:

1, specify the Pitch radius Rp of definition rotor maximum radius R, definition rotor width D, definition rotor and conjugation rotor, the center of circle of this two pitch circle is respectively t1 and t2, and Rp is less than R, and the ratio of definition rotor maximum radius R and Pitch radius Rp is R=3Rp/2.

2, get the center of circle of the center of circle t1 of pitch circle,, and on this horizontal line h1, obtain 1 P by a horizontal line h1 as the definition rotor ₀, this P ₀With the horizontal equivalent of center of circle t1 be R, by this P ₀Produce conjugate curve E ' around pitch circle center of circle t1, curve E ' is with respect to pitch circle intersection point P ₇Symmetrical curve E, get the blade part of this curve E as rotor.The intersection point P of this curve E on horizontal line h1 ₃

3, another P of definition rotor contour ₁, determine with radius R and specified central angle alpha by definition rotor center of circle t1.Tie point P ₀With P ₁Can obtain circular arc A.

4, get the contained side h2 of central angle alpha, and obtain a centre point t2 on this contained side h2, radius is r _B

5, this radius r _BTried to achieve by following: (wherein R=defines the maximum radius of rotor; Be that center of circle t1 is to putting P ₁Length)

$r_B+(R-r_B)\sin \mathrm{\&alpha;}=\frac{\mathrm{<figure-callout\; id="2"\; label="D"\; filenames="H2005100888555E00061.png,H2005100888555E00081.png"\; state="\{\{state\}\}">D</figure-callout>}}{2}$

$r_B=\frac{D/2-R\sin \mathrm{\&alpha;}}{1-\sin \mathrm{\&alpha;}}$

6, try to achieve radius r _BBe the center of circle with center of circle t2 again, then can obtain two-end-point and be a P ₁With a P ₂Circular arc B as another part of appearance curve of definition rotor, its mid point P ₂Vertical position above the t2 of the center of circle.

7, obtain the pitch circle center of circle t3 of conjugation rotor again on horizontal line h1, the horizontal equivalent of t1 and t3 is 2Rp, then defines another P of rotor contour ₄Can be by determining with radius R and specified central angle β by conjugation rotor center of circle t3.Tie point P ₃With a P ₄Obtained appearance curve is circular arc F.

8, get the contained side h3 of central angle β, and obtain a centre point t4 on this contained side h3, radius is r _C

9, this radius r _CTried to achieve by following: (wherein R=defines the maximum radius of rotor; Be that center of circle t3 is to putting P ₄Length)

$r_C+(R+r_C)\sin \mathrm{\&beta;}=\frac{D}{2}$

$r_C=\frac{D/2-R\sin \mathrm{\&beta;}}{1+\sin \mathrm{\&beta;}}$

10, try to achieve radius r _CBe the center of circle with center of circle t4 again, then can obtain two-end-point and be a P ₄With a P ₅Circular arc C as another part of appearance curve of definition rotor, some P ₅Vertical position below the t4 of the center of circle.

11, tie point P ₂An and P ₅Symmetric points P ₆Formed horizontal linear Y.

12, connect the appearance curve that above-mentioned curve E, circular arc A, circular arc B, circular arc F, circular arc C, straight line Y etc. form definition rotor 1 monodactyle, the appearance curve of another pawl becomes symmetric relation (shown in the dotted line) with the above-mentioned curve that respectively defines relatively.

Therefore, by above-mentioned step, can obtain definition rotor body appearance curve with two pawl blades.

See also Fig. 3, utilize the profile of above-mentioned steps decision definition rotor 1 after, the profile of conjugation rotor 2 is then respectively defined the conjugate curve that rotor 1 respectively defines curve (curve E, circular arc A, circular arc B, circular arc F, circular arc C, straight line Y) and is formed by above-mentioned.

See also Fig. 4 for designing method of claw type rotor of the present invention wherein defines rotor maximum radius R employing 60mm, definition rotor width D employing 85mm, central angle alpha is that 3 degree, central angle β are the application examples of 6 degree, as shown in the figure under these conditions, definition rotor 1 is much at one with the profile of conjugation rotor 2, thereby, have more close mechanical property during practical application.

See also Fig. 5 again, R adopts 60mm to remain unchanged when definition rotor maximum radius, and the width D value of definition rotor 1 is respectively 52,55,60,65,70,75, during 80mm, characteristic according to the conjugation engagement, the smaller (S1) of width D value of this definition rotor 1, the profile of pairing conjugation rotor 2 is the maximum (L1), so analogizes, and can optionally do corresponding adjustment in the practical application.

In addition, see also Fig. 6,7, designing method of claw type rotor of the present invention is wherein kept definition rotor 1 maximum radius R and is adopted 60mm, definition rotor width D to adopt 85mm, and central angle alpha and central angle β are respectively 3,6,9,12 when spending, definition rotor 1 profile variation then has different variations, clearly can show from figure, when central angle alpha during in different amount, the blade outside of definition rotor 1 can be strengthened (Fig. 6) greatly along with the change of angle, and conjugation rotor 2 is then along with the change of angle diminishes greatly.Same, as central angle β during in different amount, another outside of the blade of definition rotor 1 is can be along with the change of angle big and strengthen, and conjugation rotor 2 is then big and diminish (Fig. 7) along with the change of angle.Continuous seeing also Fig. 8, is to converge whole Fig. 5 to Fig. 7, and the width D of different definition rotor 1 and different central angle alpha and central angle β obtain radius r _BWith radius r _CThe different parameters value, according to this parameter value then can make the definition rotor 1 do relative variation adjustment with the profile of conjugation rotor 2.

Definition rotor 1 and the conjugation rotor 2 made by method of the present invention, in the invalid stage that is compressed to the beginning air inlet of the running that is meshing with each other, and exhaust began to the stage of termination, because with two different curves through smooth connection, therefore, can make two rotors produce, have higher compression ratios and delivery volume in the phenomenon that the process that turns round does not have noise and vibrations.

Only, the above person only is preferred embodiment of the present invention, and the various modifications and the variation of doing according to the present invention must be contained in this case patent claim generally.

Claims (2)

1. designing method of claw type rotor, this method is used to make the definition rotor and the conjugation rotor of mutual conjugation engagement, design the body and the blade of the definition rotor that comprises curve E, circular arc A, circular arc B, circular arc F, circular arc C, straight line Y with parametrization, and form the conjugation rotor with conjugate curve by described curve, circular arc and straight line, this method comprises: forms definition rotor step and forms conjugation rotor step, wherein:

This formation definition rotor step comprises:

Specify definition rotor maximum radius R, the width D of definition rotor, definition rotor and the Pitch radius Rp of conjugation rotor and the center of circle t1 of this two pitch circle, t3, this two centre of pitch circle distance is 2Rp, Rp is less than R, and R and Rp the two a proper proportion is arranged;

Get the center of circle of the center of circle t1 of pitch circle,, and on this horizontal line h1, obtain 1 P by a horizontal line h1 as the definition rotor ₀, this P ₀With the horizontal equivalent of center of circle t1 be R, by this P ₀Produce conjugate curve E ' around center of circle t1, curve E ' is with respect to two pitch circle intersection point P ₇Symmetrical curve E, get the blade part of this curve E as rotor; The intersection point P of this curve E on horizontal line h1 ₃

With radius R and specified central angle alpha, decision defines another P of rotor motion curve by this horizontal line h1, center of circle t1 ₁, connect aforementioned some P ₀With P ₁Can obtain the circular arc A of definition rotor contour, and be connected with curve E is smooth-going;

On the contained side h2 of this central angle alpha, obtain the second centre point t2, and try to achieve the radius r of the second centre point t2 via the trigonometric function relation _B, then can obtain one is the circular arc B in center of circle another part of appearance curve as the definition rotor with the second centre point t2, and obtains two end points P of this circular arc B ₁With P ₂, and some P ₂Vertical position above the t2 of the center of circle;

The center of circle t1 that goes up with respect to definition rotor pitch circle in this horizontal line h1 gets the centre point of 1 t3 as conjugation rotor pitch circle, and the horizontal equivalent of center of circle t3 and center of circle t1 is 2Rp, then defines 1 P of another appearance curve of rotor ₄Can connect aforementioned some P by determining with radius R and specified central angle β by center of circle t3 ₃With a P ₄Can obtain another appearance curve circular arc F of definition rotor;

On the contained side h3 of this central angle β, obtain the 4th centre point t4, and try to achieve the radius r of the 4th centre point t4 via the trigonometric function relation _C, then can obtain one is the circular arc C in center of circle another part of appearance curve as the definition rotor with the 4th centre point t4, and obtains two end point P of this circular arc C ₄With a P ₅, and some P ₅Vertical position below the t4 of the center of circle;

Tie point P ₂An and P ₅Symmetric points P ₆Formed horizontal linear Y; The appearance curve that connects above-mentioned curve E, circular arc A, circular arc B, circular arc F, circular arc C, straight line Y composition definition rotor (1) monodactyle, the appearance curve of another pawl becomes symmetric relation with the appearance curve of above-mentioned monodactyle relatively, so for defining the body appearance curve of rotor;

This formation conjugation rotor step is, utilize the profile of above-mentioned steps decision definition rotor after, the profile of conjugation rotor then is made up of the conjugate curve that respectively define curve in the above-mentioned definition rotor;

Described radius r _BBe to try to achieve by following trigonometric function relation:

$r_B+(R-r_B)\sin \mathrm{\&alpha;}=\frac{D}{2}$

$r_B=\frac{D/2-R\sin \mathrm{\&alpha;}}{1-\sin \mathrm{\&alpha;}}$

Wherein R=defines the maximum radius of rotor; Be that center of circle t1 is to putting P ₁Length;

Described radius r _CBe to try to achieve by following trigonometric function relation:

$r_C+(R+r_C)\sin \mathrm{\&beta;}=\frac{D}{2}$

$r_C=\frac{D/2-R\sin \mathrm{\&beta;}}{1+\sin \mathrm{\&beta;}}$

Wherein R=defines the maximum radius of rotor; Be that center of circle t3 is to putting P ₄Length.

2. designing method of claw type rotor according to claim 1 is characterized in that the ratio of described definition rotor maximum radius R and Pitch radius Rp is R=3Rp/2.

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