CN217270816U - Vacuum pump rotor and vacuum pump - Google Patents

Abstract

An embodiment of the utility model provides a vacuum pump rotor and vacuum pump relates to the vacuum pump field. The end face profile of the vacuum pump rotor comprises: and the curve L comprises a cycloid AB, a tooth root circular arc BC, an excircle circular arc CD, an involute DE, an inner circle circular arc EF and a tooth top circular arc FA which are sequentially connected, the vacuum pump rotor is a screw rotor, the radius of the excircle circular arc CD is r1, and the radius of the inner circle circular arc EF is r2, wherein the excircle circular arc CD is tangent to the tooth root circular arc BC and the involute DE simultaneously, and the inner circle circular arc EF is tangent to the involute DE and the tooth top circular FA simultaneously, so that a sharp point of an end face molded line of the vacuum pump rotor can be eliminated, the end face molded line is in smooth transition, and the problem that a cutter jumps during machining to cause machining difficulty is avoided.

Description

Vacuum pump rotor and vacuum pump

Technical Field

The utility model relates to a vacuum pump field particularly, relates to a vacuum pump rotor and vacuum pump.

Background

Vacuum pumps are important members of industrial equipment, for example, screw vacuum pumps are air-extracting devices which utilize a pair of screw rotors to synchronously rotate in opposite directions at high speed in a pump body to generate air suction and exhaust effects, and are the updating products of oil-sealed vacuum pumps, can extract and remove gas containing a large amount of water vapor and a small amount of dust, and are widely applied in modern industry. For the screw vacuum pump, the key technology is the mutually meshed screws, the key of the mutually meshed screws is the end face molded line, and the end face molded line directly influences the performance of the screw vacuum pump, such as sealing performance, efficiency, area utilization coefficient and the like, and simultaneously determines the processing and manufacturing cost of the pump.

In the prior art, a cutter is easy to jump in the manufacturing process of a rotor of a vacuum pump, so that the machining is difficult.

SUMMERY OF THE UTILITY MODEL

The utility model provides a vacuum pump rotor and vacuum pump, it can avoid taking place the cutter and beat, reduces the processing degree of difficulty.

The embodiment of the utility model discloses a can realize like this:

an embodiment of the utility model provides a vacuum pump rotor, vacuum pump rotor's terminal surface molded lines includes:

the curve L comprises a cycloid AB, a tooth root circular arc BC, an excircle circular arc CD, an involute DE, an inner circle circular arc EF and an addendum circular arc FA which are sequentially connected, and the vacuum pump rotor is a screw rotor;

wherein the parametric equation for cycloid AB is:

x1 ═ R sin (2 × seven) -2A sin (t)

Y1 ═ 2A × cos (t) -R × cos (2 × t), where X1 and Y1 are rectangular coordinates of points on the cycloid AB, R is the radius of the addendum circle, a is half the center distance between the end face rotor profiles of the two meshed vacuum pump rotors, and t is a preset value;

the parameter equation of the involute DE is as follows:

X2＝R ₀ *sin(t+((Rm-Rg)^2/R ₀ ^2-1)^0.5+arccos(R ₀ /(Rm-Rg)))+R ₀ *t*cos(t-((Rm-Rg)^2/R ₀ ^2-1)^0.5+arcsin(R ₀ /(Rm-Rg)))

Y2＝-R ₀ *cos(t-((Rm-Rg)^2/R ₀ ^2-1)^0.5+arccos(R ₀ /(Rm-Rg)))+R ₀ *t*sin(t-((Rm-Rg)^2/R ₀ ^2-1)^0.5+arccos(R ₀ v (Rm-Rg))) where X2 and Y2 are the rectangular coordinates of points on the involute DE, and R ₀ For base circle radius, Rm is addendum circle radius, Rg is dedendum circle radius, and the value range of t is: [0,1]；

The excircle circular arc CD radius is r1, the radius of interior circular arc EF is r2, the circular O of excircle ₂ And the center O of the addendum circle ₁ Is d1, the center of the circle O ₂ To the center of the circle O ₁ Is w1 with the extension line of the connection line of point A and point B of the cycloid AB, and the circle O of the inner circle ₃ And the center O of the addendum circle ₁ Is d2, the center of the circle O ₃ To the center of the circle O ₁ The included angle between the straight line of the cycloid AB and the extension line of the connecting line of the point A and the point B is w 2;

wherein, excircle circular arc CD simultaneously with the root circle circular arc BC with involute DE is tangent, interior circle circular arc EF simultaneously with involute DE with addendum circle FA is tangent.

Optionally, in the parameter equation of the cycloid AB, a value range of the preset value t is as follows: 0. ltoreq. t.ltoreq.arccos (2A/(2. multidot. R)).

Optionally, the base radius R ₀ (2 x z) r2/pi, wherein z is a preset value.

Optionally, the value of z is 2 or 3.

Optionally, the addendum radius Rm is a + r 2.

Optionally, the root circle radius Rg-a-r 2.

Optionally, the number of the curves L is one, the cycloid AB, the tooth root circle arc BC, the excircle arc CD, the involute DE, the inner circle arc EF, and the addendum circle arc FA are sequentially connected end to form an end profile of the single-head vacuum pump rotor, and the distance d1 is equal to the distance d 2.

Optionally, the number of the curves L is two, and the two curves L are sequentially connected end to form an end face profile of the double-ended vacuum pump rotor.

Optionally, the radius r1 of the outer circular arc CD is equal to the radius r2 of the inner circular arc EF.

The embodiment of the utility model also provides a vacuum pump, which comprises a pump body and two vacuum pump rotors, wherein the two vacuum pump rotors are mutually meshed;

the point A, the tooth root circular arc BC, the excircle circular arc CD and the involute DE of the end face molded line of one vacuum pump rotor are respectively used for meshing the cycloid AB, the addendum circular arc FA, the inner circle circular arc EF and the involute DE of the end face molded line of the other vacuum pump rotor.

The utility model discloses vacuum pump rotor and vacuum pump's beneficial effect includes, for example:

an embodiment of the utility model provides a vacuum pump rotor, vacuum pump rotor's terminal surface molded lines includes: a curve L, the curve L comprises a cycloid AB, a tooth root circular arc BC, an excircle circular arc CD, an involute DE, an inner circle circular arc EF and an addendum circular arc FA which are sequentially connected, the vacuum pump rotor is a screw rotor, the radius of the excircle circular arc CD is r1, the radius of the inner circle circular arc EF is r2, and the circle O of the excircle is ₂ And the center O of addendum circle ₁ Is d1, center O ₂ To the center of circle O ₁ Straight line and pendulum ofThe included angle of the extension line of the connection line of the point A and the point B of the line AB is w1, and the circle O of the inner circle ₃ And the center O of addendum circle ₁ Is d2, center O ₃ To the center of circle O ₁ The included angle of the extension lines of the connecting lines of the straight line and the point A and the point B of the cycloid AB is w2, wherein the excircle arc CD is tangent to the tooth root circle arc BC and the involute DE, and the inner circle arc EF is tangent to the involute DE and the tooth top circle FA, so that the sharp point of the end face molded line of the vacuum pump rotor can be eliminated, the end face molded line is in smooth transition, and the problem that the machining is difficult due to the fact that a cutter jumps in the machining process is avoided.

The embodiment of the utility model provides a vacuum pump is still provided, including the pump body and two foretell vacuum pump rotors, two vacuum pump rotor intermeshing, point A, the root circle circular arc BC, the excircle circular arc CD of the terminal surface molded lines of one of them vacuum pump rotor and the DE that gradually bursts at seams are used for respectively going the cycloid AB, the addendum circle circular arc FA, the interior circular arc EF and the DE that gradually bursts at seams of the terminal surface molded lines of another vacuum pump rotor, it can avoid taking place the cutter in man-hour and beat, leads to the processing difficulty.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic view of an end face profile of a vacuum pump rotor provided in an embodiment of the present invention;

fig. 2 is a schematic view of end face profile meshing of a single-head screw rotor provided in an embodiment of the present invention;

fig. 3 is a schematic view of the end face profile meshing of the double-ended screw rotor provided in an embodiment of the present invention;

fig. 4 is a schematic view of the engagement of the end-face profile of the three-headed screw rotor provided in the embodiment of the present invention;

fig. 5 is a schematic view of end-face profile meshing of a four-head screw rotor provided in an embodiment of the present invention;

fig. 6 is a schematic view of end-face profile meshing of a five-screw rotor according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.

In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the products of the present invention are used, the description is only for convenience of description and simplification, but the indication or suggestion that the indicated device or element must have a specific position, be constructed and operated in a specific orientation, and thus, should not be interpreted as a limitation of the present invention.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

Vacuum pumps are important members of industrial equipment, for example, screw vacuum pumps are air-extracting devices which utilize a pair of screw rotors to synchronously rotate in opposite directions at high speed in a pump body to generate air suction and exhaust effects, and are the updating products of oil-sealed vacuum pumps, can extract and remove gas containing a large amount of water vapor and a small amount of dust, and are widely applied in modern industry. For a screw vacuum pump, the key technology is that screws are meshed with each other, the key of the meshed screws is end face molded lines, the end face molded lines directly influence the performance of the screw vacuum pump, such as tightness, efficiency, area utilization coefficient and the like, and simultaneously determine the processing and manufacturing cost of the pump.

In view of this, the present invention provides a vacuum pump rotor and a vacuum pump, which can solve the above problem.

Referring to fig. 1-6, the present embodiment provides a vacuum pump rotor and a vacuum pump, which will be described in detail below.

Referring to fig. 1 and 2, an embodiment of the present invention provides a vacuum pump, which includes a pump body (not shown) and two vacuum pump rotors engaged with each other, specifically, the vacuum pump rotors are screw rotors, and end face profiles of the two vacuum pump rotors are the same and are both installed in the pump body, so as to facilitate transmission of a synchronous gear.

In this embodiment, the vacuum pump rotor is a single-head screw rotor, and the end profile thereof includes: and the curve L comprises a cycloid AB, a tooth root circular arc BC, an excircle circular arc CD, an involute DE, an inner circle circular arc EF and an addendum circular arc FA which are sequentially connected.

Specifically, the number of the curves L is one, and the cycloid AB, the tooth root circular arc BC, the excircle circular arc CD, the involute DE, the inner circle circular arc EF, and the addendum circular arc FA are sequentially connected end to form an end face profile of the single-head vacuum pump rotor.

The point A, the tooth root circular arc BC, the excircle circular arc CD and the involute DE of the end face molded line of one vacuum pump rotor are respectively used for meshing the cycloid AB, the addendum circular arc FA, the inner circle circular arc EF and the involute DE of the end face molded line of the other vacuum pump rotor.

Wherein the radius of the excircle circular arc CD is r1, the radius of the inner circle circular arc EF is r2, and the excircle circular O ₂ And the center O of addendum circle ₁ Is d1, center O ₂ To the center of circle O ₁ The included angle between the straight line of (A) and the extension line of the connecting line of point A and point B of cycloid AB is w1, and the circle of the inner circle is O ₃ And the center O of addendum circle ₁ Is d2, center O ₃ To the center of circle O ₁ The included angle between the straight line of (a) and the extension line of the connecting line of the point a and the point B of the cycloid AB is w2, and in the embodiment, the included angle w1 and the included angle w2 are both 135 degrees.

In addition, in this embodiment, the distance d1 is equal to the distance d2, and the radius r1 of the outer circular arc CD is equal to the radius r2 of the inner circular arc EF, wherein the outer circular arc CD is tangent to the tooth root circle arc BC and the involute DE, and the inner circular arc EF is tangent to the involute DE and the tooth addendum circle FA, so that a sharp point of an end face profile of the vacuum pump rotor can be eliminated, the end face profile is in smooth transition, and tool runout during machining is avoided, which causes machining difficulty.

Wherein, the parameter equation of cycloid AB is:

X1＝R*sin(2*t)-2A*sin(t)

y1 ═ 2A × cos (t) -R × cos (2 × t), where X1 and Y1 are rectangular coordinates of points on the cycloid AB, R is the radius of the addendum circle, a is half of the center distance between the end rotor profiles of the two meshing vacuum pump rotors, t is a preset value, and the range of the preset value t is: 0. ltoreq. t.ltoreq.arccos (2A/(2. multidot. R)).

In addition, the parameter equation of the involute DE is:

X2＝R ₀ *sin(t+((Rm-Rg)^2/R ₀ ^2-1)^0.5+arccos(R ₀ /(Rm-Rg)))+R ₀ *t*cos(t-((Rm-Rg)^2/R ₀ ^2-1)^0.5+arcsin(R ₀ /(Rm-Rg)))

Y2＝-R ₀ *cos(t-((Rm-Rg)^2/R ₀ ^2-1)^0.5+arccos(R ₀ /(Rm-Rg)))+R ₀ *t*sin(t-((Rm-Rg)^2/R ₀ 2-1) 0.5+ arccos (R). V (Rm-Rg))) where X2 and Y2 are the rectangular coordinates of points on the involute DE, and R ₀ Is the radius of a base circle, Rm is the radius of an addendum circle, Rg is the radius of a dedendum circle, and in the parameter equation of an involute DE, the value range of t is as follows: [0,1]。

Wherein, the base radius R ₀ And 2/pi, wherein z is a preset value, z can be 2 or 3 or 4 or 5, specific values are not limited herein, in addition, the pitch circle radius in the end face profile is Rp, the pitch circle radius Rp is equal to the value a, the addendum circle radius Rm is a + r2, and the dedendum circle radius Rg is a-r 2.

Referring to fig. 3, the number of the curves L is two, and the two curves L are sequentially connected end to form an end profile of the double-head vacuum pump rotor, which can solve the dynamic balance problem of the single-head screw rotor and reduce the vibration during the rotation process.

With continued reference to fig. 4-6, the number of the curves L may also be three, the three curves L are sequentially connected end to form end face profiles of the three-headed screw rotor, when the number of the curves L is four, the four curves L are sequentially connected end to form end face profiles of the four-headed screw rotor, the number of the curves L is five, and the five curves L are sequentially connected end to form end face profiles of the five-headed screw rotor.

In summary, the end face profile of the vacuum pump rotor includes: a curve L, the curve L comprises a cycloid AB, a tooth root circular arc BC, an excircle circular arc CD, an involute DE, an inner circle circular arc EF and an addendum circular arc FA which are sequentially connected, the vacuum pump rotor is a screw rotor, the radius of the excircle circular arc CD is r1, the radius of the inner circle circular arc EF is r2, and the circle O of the excircle is ₂ And the center O of addendum circle ₁ Is d1, center O ₂ To the center of circle O ₁ The included angle between the straight line of (A) and the extension line of the connecting line of point A and point B of cycloid AB is w1, and the circle of the inner circle is O ₃ And the center O of addendum circle ₁ Is d2, center O ₃ To the center of circle O ₁ The included angle of the extension line of the line connecting the point A and the point B of the cycloid AB is w2, wherein the excircle arc CD is tangent to the tooth root circle arc BC and the involute DE at the same time, and the inner circle arc EF is tangent to the tooth root circle arc BC and the involute DE at the same timeThe involute DE is tangent to the addendum circle FA, so that the cusp of the end face molded line of the vacuum pump rotor can be eliminated, the end face molded line is in smooth transition, and the problem of difficult processing caused by tool jumping during processing is avoided.

The vacuum pump comprises a pump body and two vacuum pump rotors, wherein the two vacuum pump rotors are meshed with each other, a point A, a tooth root circular arc BC, an excircle circular arc CD and an involute DE of an end face molded line of one vacuum pump rotor are respectively used for meshing a cycloid AB, an addendum circular arc FA, an inner circle circular arc EF and the involute DE of the end face molded line of the other vacuum pump rotor, and the vacuum pump can avoid the phenomenon that a cutter jumps during machining to cause machining difficulty.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A vacuum pump rotor, characterized in that an end face profile of the vacuum pump rotor comprises:

the curve L comprises a cycloid AB, a tooth root circular arc BC, an excircle circular arc CD, an involute DE, an inner circle circular arc EF and an addendum circular arc FA which are sequentially connected, and the vacuum pump rotor is a screw rotor;

wherein the parametric equation for cycloid AB is:

X1＝R*sin(2*t)-2A*sin(t)

y1 ═ 2A × cos (t) -R × cos (2 × t), where X1 and Y1 are rectangular coordinates of points on the cycloid AB, R is the radius of the addendum circle, a is half the center distance between the end face rotor profiles of the two meshed vacuum pump rotors, and t is a preset value;

the parameter equation of the involute DE is as follows:

X2＝R ₀ *sin(t+((Rm-Rg)^2/R ₀ ^2-1)^0.5+arccos(R ₀ /(Rm-Rg)))

+R ₀ *t*cos(t-((Rm-Rg)^2/R ₀ ^2-1)^0.5+arcsin(R ₀ /(Rm-Rg)))

Y2＝-R ₀ *cos(t-((Rm-Rg)^2/R ₀ ^2-1)^0.5+arccos(R ₀ /(Rm-Rg)))

+R ₀ *t*sin(t-((Rm-Rg)^2/R ₀ ^2-1)^0.5+arccos(R ₀ v (Rm-Rg))) where X2 and Y2 are the rectangular coordinates of points on the involute DE, and R ₀ For the base circle radius, Rm is the addendum circle radius, Rg is the dedendum circle radius, and the value range of t is as follows: [0,1]；

The excircle circular arc CD radius is r1, the radius of interior circular arc EF is r2, the circular O of excircle ₂ And the center O of the addendum circle ₁ Is d1, the center of the circle O ₂ To the center of the circle O ₁ Is w1 with the extension line of the connection line of point A and point B of the cycloid AB, and the circle O of the inner circle ₃ And the center O of the addendum circle ₁ Is d2, the center of the circle O ₃ To the center of the circle O ₁ The included angle between the straight line of the cycloid AB and the extension line of the connecting line of the point A and the point B is w 2;

wherein, excircle circular arc CD simultaneously with the root circle circular arc BC with involute DE is tangent, interior circle circular arc EF simultaneously with involute DE with addendum circle FA is tangent.

2. A vacuum pump rotor as claimed in claim 1, wherein in the parametric equation of cycloid AB, the preset value t is in the range: 0. ltoreq. t.ltoreq.arccos (2A/(2. multidot. R)).

3. A vacuum pump rotor as claimed in claim 1, wherein the base radius R ₀ (2 x z) r2/pi, wherein z is a preset value.

4. A vacuum pump rotor as claimed in claim 3, wherein z has a value of 2 or 3.

5. A vacuum pump rotor as defined in claim 1, wherein the addendum radius Rm is a + r 2.

6. A vacuum pump rotor according to claim 5, wherein the root circle radius Rg-A-r 2.

7. A vacuum pump rotor according to claim 1, wherein the number of said curves L is one, and said cycloid AB, the root circle arc BC, the outer circle arc CD, the involute DE, the inner circle arc EF and the addendum circle arc FA are sequentially connected end to form an end profile of a single-ended vacuum pump rotor, and said distance d1 and said distance d2 are equal.

8. A vacuum pump rotor as claimed in claim 1, wherein the number of said curves L is two, and two of said curves L are connected end to end in sequence to form an end profile of a double-ended vacuum pump rotor.

9. A vacuum pump rotor according to claim 1, wherein the radius r1 of the outer circular arc CD is equal to the radius r2 of the inner circular arc EF.

10. A vacuum pump comprising a pump body and two vacuum pump rotors according to any one of claims 1 to 9, the two vacuum pump rotors being intermeshed;

the point A, the tooth root circular arc BC, the excircle circular arc CD and the involute DE of the end face molded line of one vacuum pump rotor are respectively used for meshing the cycloid AB, the addendum circular arc FA, the inner circle circular arc EF and the involute DE of the end face molded line of the other vacuum pump rotor.

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