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 the field of vacuum pumps, in particular to a vacuum pump rotor and a vacuum pump.

Background technique

Vacuum pump is an important member of industrial equipment. For example, screw vacuum pump is a pumping device that uses a pair of screw rotors in the pump body to perform synchronous high-speed reverse rotation to generate suction and exhaust. It is an update of oil-sealed vacuum pumps. The new generation product can extract the gas containing a large amount of water vapor and a small amount of dust, and is widely used in modern industry. For the screw vacuum pump, the key technology is the intermeshing screw. The key of the intermeshing screw is the end profile. The end profile directly affects the performance of the screw vacuum pump, such as tightness, efficiency, area utilization factor, etc., which also determines the The manufacturing cost of the pump.

In the prior art, during the manufacturing process of the vacuum pump rotor, tool jumping is likely to occur, resulting in processing difficulties.

Utility model content

The utility model provides a vacuum pump rotor and a vacuum pump, which can avoid tool jumping and reduce processing difficulty.

Embodiments of the present utility model can be implemented as follows:

The embodiment of the present utility model provides a vacuum pump rotor, and the end face profile of the vacuum pump rotor includes:

Curve L, the curve L includes the cycloid AB, the root circular arc BC, the outer circular arc CD, the involute DE, the inner circular arc EF, the tooth tip circular arc FA connected in sequence, and the vacuum pump rotor for the screw rotor;

Wherein, the parametric equation of the cycloid AB is:

X1=R*sin(2*seven)-2A*sin(t)

Y1=2A*cos(t)-R*cos(2*t), where X1 and Y1 are the Cartesian coordinates of the points on the cycloid AB, R is the radius of the addendum circle, and A is the end face of the two meshing vacuum pump rotors Half of the center distance of the rotor profile, t is the preset value;

The parametric 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 ₀ /(Rm-Rg))), where X2 and Y2 are the Cartesian coordinates of points on the involute DE, R ₀ is the radius of the base circle, Rm is the radius of the tip circle, Rg is the radius of the root circle, and the value range of t is: [0, 1];

The radius of the outer circular arc CD is r1, the radius of the inner circular arc EF is r2, the distance between the circle _{O2 of} the outer circle and the center O1 of the addendum circle is d1, and the center of the circle is d1. The included angle between the straight line from O ₂ to the center O ₁ and the extension line connecting the points A and B of the cycloid AB is w1, the circle O ₃ of the inner circle and the center of the addendum circle The distance of O ₁ is d2, and the included angle between the straight line from the center O ₃ to the center O ₁ and the extension line connecting the point A and the point B of the cycloid AB is w2;

Wherein, the outer circular arc CD is tangent to the root circular arc BC and the involute DE at the same time, and the inner circular arc EF is simultaneously to the involute DE and the addendum circle. FA is tangent.

Optionally, in the parameter equation of the cycloid AB, the value range of the preset value t is: 0≤t≤arccos(2A/(2*R)).

Optionally, the base circle radius R ₀ =(2*z)*r2/pi, where z is a preset value.

Optionally, the value of z is 2 or 3.

Optionally, the addendum circle radius Rm=A+r2.

Optionally, the root circle radius Rg=A-r2.

Optionally, the number of the curve L is one, and the cycloid AB, the root circular arc BC, the outer circular arc CD, the involute DE, the inner circular arc EF, and the tooth tip circular arc FA are in sequence. End-to-end connection to form the end face profile of the single-head vacuum pump rotor, the distance d1 and the distance d2 are equal.

Optionally, the number of the curves L is two, and the two curves L are connected end to end in sequence to form the end face profile of the double-head 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 present invention also provides a vacuum pump, comprising a pump body and two above-mentioned vacuum pump rotors, and the two vacuum pump rotors are meshed with each other;

The point A, the root arc BC, the outer arc CD and the involute DE of the end profile of one of the vacuum pump rotors are respectively used to mesh with the cycloid AB of the end profile of the other vacuum pump rotor , Addendum arc FA, inner arc EF and involute DE.

The beneficial effects of the vacuum pump rotor and the vacuum pump of the embodiment of the present invention include, for example:

The embodiment of the present utility model provides a vacuum pump rotor. The end face profile of the vacuum pump rotor includes: a curve L, and the curve L includes a cycloid AB, a root circular arc BC, an outer circular arc CD, and an involute connected in sequence. DE, inner arc EF, tooth top arc FA, the vacuum pump rotor is a screw rotor, the radius of the outer arc CD is r1, the radius of the inner arc EF is r2, the outer circle O ₂ and the tooth top The distance between the center O ₁ of the circle is d1, the angle between the straight line from the center O ₂ to the center O ₁ and the extension line connecting the points A and B of the cycloid AB is w1, the circle O ₃ of the inner circle and the tooth tip The distance between the center O ₁ of the circle is d2, and the angle between the line from the center O ₃ to the center O ₁ and the extension line connecting the points A and B of the cycloid AB is w2. The root circular arc BC is tangent to the involute DE, and the inner circular arc EF is tangent to the involute DE and the addendum circle FA at the same time. Therefore, the sharp point of the end face profile of the vacuum pump rotor can be eliminated, and its end profile line can be eliminated. Smooth transition to avoid tool jumping during machining, which causes machining difficulties.

The embodiment of the present invention also provides a vacuum pump, comprising a pump body and two above-mentioned vacuum pump rotors, the two vacuum pump rotors are meshed with each other, and the point A of the end face profile of one of the vacuum pump rotors, the tooth root arc BC, The outer circular arc CD and the involute DE are respectively used to mesh the cycloid AB, the addendum circular arc FA, the inner circular arc EF and the involute DE of the end face profile of the rotor of another vacuum pump. Tool runout occurs during machining, making machining difficult.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings that need to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention. Therefore, it should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can also be obtained from these drawings without any creative effort.

Fig. 1 is the schematic diagram of the end face profile of the vacuum pump rotor provided in the embodiment of the present utility model;

2 is a schematic diagram of the end face profile meshing of a single-start screw rotor provided in an embodiment of the present utility model;

3 is a schematic diagram of the end face profile meshing of a double-ended screw rotor provided in an embodiment of the present utility model;

4 is a schematic diagram of the end face profile meshing of a three-head screw rotor provided in an embodiment of the present utility model;

5 is a schematic diagram of the end face profile meshing of a four-head screw rotor provided in an embodiment of the present utility model;

FIG. 6 is a schematic diagram of the end face profile meshing of the five-start screw rotor provided in the embodiment of the present invention.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The embodiments described above are a part of the embodiments of the present invention, but not all of the embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided 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 those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present utility model, it should be noted that, if the azimuth or positional relationship indicated by the terms "upper", "down", "inner", "outer", etc. appears, it is based on the azimuth or positional relationship shown in the accompanying drawings, Or the orientation or positional relationship that the utility model product is usually placed in use is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as a limitation of the present invention.

In addition, where the terms "first", "second" and the like appear, they are only used to differentiate the description, and should not be construed as indicating or implying relative importance.

It should be noted that the features in the embodiments of the present invention may be combined with each other under the condition of no conflict.

Vacuum pump is an important member of industrial equipment. For example, screw vacuum pump is a pumping device that uses a pair of screw rotors in the pump body to perform synchronous high-speed reverse rotation to generate suction and exhaust. It is an update of oil-sealed vacuum pumps. The new generation product can extract the gas containing a large amount of water vapor and a small amount of dust, and is widely used in modern industry. For the screw vacuum pump, its key technology is the intermeshing screw, and the key of the intermeshing screw is the end profile. The end profile directly affects the performance of the screw vacuum pump, such as sealing, efficiency, area utilization factor, etc., which also determines the The processing and manufacturing cost of the pump. In the prior art, during the manufacturing process of the rotor of the vacuum pump, tool jumping is likely to occur, resulting in processing difficulties.

In view of this, the vacuum pump rotor and the vacuum pump provided in the embodiments of the present invention can solve this problem.

Please refer to FIG. 1 to FIG. 6 , this embodiment provides a vacuum pump rotor and a vacuum pump, which will be described in detail next.

Please refer to FIG. 1 and FIG. 2 , an embodiment of the present invention provides a vacuum pump, including a pump body (not shown) and two vacuum pump rotors that mesh with each other. Specifically, the vacuum pump rotor is a screw rotor, and two vacuum pump rotors are The end face profile of the rotor is the same, and they are all installed in the pump body to facilitate the transmission of the synchronous gear.

In this embodiment, the vacuum pump rotor is a single-head screw rotor, and its end face profile includes: a curve L, and the curve L includes a cycloid AB, a tooth root circular arc BC, an outer circular arc CD, an involute connected in sequence DE, inner circular arc EF, tooth tip circular arc FA.

Specifically, the number of the curve L is one, and the cycloid AB, the root circular arc BC, the outer circular arc CD, the involute DE, the inner circular arc EF, and the tooth tip circular arc FA are connected end to end in sequence to form End profile for single head vacuum pump rotor.

The point A, the root arc BC, the outer arc CD and the involute DE of the end face profile of one of the vacuum pump rotors are used to mesh with the cycloid AB and the addendum circle of the end face profile of the other vacuum pump rotor, respectively. Circular arc FA, inner circular arc EF, and involute DE.

Among them, the radius of the outer arc CD is r1, the radius of the inner arc EF is r2, the distance between the circle O ₂ of the outer circle and the center O ₁ of the addendum circle is d1, and the straight line from the center O ₂ to the center O ₁ The angle between the extension line connecting point A and point B of the cycloid AB is w1, the distance between the circle O ₃ of the inner circle and the center O ₁ of the addendum circle is d2, and the straight line from the center O ₃ to the center O ₁ The included angle of the extension line connecting the point A and the point B of the cycloid AB is w2. In this embodiment, the included angle w1 and the included angle w2 are both 135 degrees.

In addition, in this embodiment, the distance d1 and the distance d2 are equal, 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 equal to the root circular arc BC and The involute DE is tangent, and the inner circular arc EF is tangent to the involute DE and the addendum circle FA at the same time. Therefore, the sharp point of the end face profile of the vacuum pump rotor can be eliminated, and the end profile profile of the vacuum pump can be smoothly transitioned to avoid machining. When the tool jumps, it causes processing difficulties.

Among them, the parametric equation of the cycloid AB is specifically:

X1=R*sin(2*t)-2A*sin(t)

Y1=2A*cos(t)-R*cos(2*t), where X1 and Y1 are the Cartesian coordinates of the points on the cycloid AB, R is the radius of the addendum circle, and A is the end face of the two meshing vacuum pump rotors Half of the center distance of the rotor profile, t is a preset value, and the range of the preset value t is: 0≤t≤arccos(2A/(2*R)).

In addition, the parametric 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./(Rm-Rg))), where X2 and Y2 are the Cartesian coordinates of points on the involute DE, R ₀ is the radius of the base circle, Rm is the radius of the addendum circle, and Rg is the radius of the root circle. In the parametric equation of the involute DE, the value range of t is: [0, 1].

Among them, the radius of the base circle R ₀ =(2*z) minus 2/pi, where z is a preset value, and the value of z can be 2 or 3 or 4 or 5. The specific value is not limited here. In addition, the end face The pitch circle radius in the profile line is Rp, the pitch circle radius Rp is equal to the value A, the addendum circle radius Rm=A+r2, and the root circle radius Rg=A-r2.

Please refer to Figure 3, the number of curves L is two, and the two curves L are connected end to end in turn to form the end face profile of the double-ended vacuum pump rotor, which can solve the dynamic balance problem of the single-ended screw rotor and reduce the amount of friction during the rotation process. shock.

Please continue to refer to Figure 4 to Figure 6. The number of curves L can also be three, and the three curves L are connected end to end to form the end face profile of the three-head screw rotor. When the number of curves L is four, the four curves L are connected end to end in turn. To form the end face profile of the four-head screw rotor, the number of curves L is five, and the five curves L are connected end to end to form the end face profile of the five-head screw rotor.

To sum up, the end face profile of the vacuum pump rotor includes: curve L, and curve L includes cycloid AB, root arc BC, outer arc CD, involute DE, and inner arc EF connected in sequence , the addendum arc FA, the vacuum pump rotor is a screw rotor, the radius of the outer arc CD is r1, the radius of the inner arc EF is r2, the distance between the circle _{O2 of} the outer circle and the center O1 of the addendum circle is d1, the angle between the straight line from the center O ₂ to the center O ₁ and the extension line connecting the point A and point B of the cycloid AB is w1, the distance between the circle O ₃ of the inner circle and the center O ₁ of the addendum circle is d2, the included angle between the straight line from the center O ₃ to the center O ₁ and the extension line connecting the point A and point B of the cycloid AB is w2, wherein the outer circular arc CD is at the same time with the tooth root circular arc BC and the gradient. The opening line DE is tangent, and the inner arc EF is tangent to the involute DE and the addendum circle FA at the same time. Therefore, the cusp of the end face profile of the vacuum pump rotor can be eliminated, and the end profile profile of the vacuum pump can be smoothly transitioned to avoid machining. Tool runout occurs, causing machining difficulties.

The vacuum pump includes a pump body and two above-mentioned vacuum pump rotors, the two vacuum pump rotors are meshed with each other, and the point A, the tooth root arc BC, the outer arc CD and the involute DE of the end face profile of one vacuum pump rotor are respectively The cycloid AB, the addendum arc FA, the inner arc EF and the involute DE used to mesh the end profile of another vacuum pump rotor can avoid tool runout during machining, resulting in machining difficulties.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field of the present invention can easily think of changes within the technical scope disclosed by the present invention. Or replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. a vacuum pump rotor, is characterized in that, the end face profile of described vacuum pump rotor comprises: Curve L, the curve L includes the cycloid AB, the root circular arc BC, the outer circular arc CD, the involute DE, the inner circular arc EF, the tooth tip circular arc FA connected in sequence, and the vacuum pump rotor for the screw rotor; Wherein, the parametric equation of the cycloid AB is: X1=R*sin(2*t)-2A*sin(t) Y1=2A*cos(t)-R*cos(2*t), where X1 and Y1 are the Cartesian coordinates of the points on the cycloid AB, R is the radius of the addendum circle, and A is the end face of the two meshing vacuum pump rotors Half of the center distance of the rotor profile, t is the preset value; The parametric 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 ₀ /(Rm-Rg))), where X2 and Y2 are involute The Cartesian coordinates of the point on the line DE, R ₀ is the radius of the base circle, Rm is the radius of the addendum circle, Rg is the radius of the root circle, and the value range of t is: [0, 1]; The radius of the outer circular arc CD is r1, the radius of the inner circular arc EF is r2, the distance between the circle _{O2 of} the outer circle and the center O1 of the addendum circle is d1, and the center of the circle is d1. The included angle between the straight line from O ₂ to the center O ₁ and the extension line connecting the points A and B of the cycloid AB is w1, the circle O ₃ of the inner circle and the center of the addendum circle The distance of O ₁ is d2, and the included angle between the straight line from the center O ₃ to the center O ₁ and the extension line connecting the point A and the point B of the cycloid AB is w2; Wherein, the outer circular arc CD is tangent to the root circular arc BC and the involute DE at the same time, and the inner circular arc EF is simultaneously to the involute DE and the addendum circle. FA is tangent. 2. The vacuum pump rotor according to claim 1, wherein, in the parameter equation of the cycloid AB, the value range of the preset value t is: 0≤t≤arccos(2A/(2*R)) . 3 . The vacuum pump rotor according to claim 1 , wherein the base circle radius R ₀ =(2*z)*r2/pi, wherein z is a preset value. 4 . 4 . The vacuum pump rotor according to claim 3 , wherein the value of z is 2 or 3. 5 . 5 . The vacuum pump rotor according to claim 1 , wherein the addendum circle radius Rm=A+r2. 6 . 6 . The vacuum pump rotor according to claim 5 , wherein the root circle radius Rg=A-r2. 7 . 7. The vacuum pump rotor according to claim 1, wherein the number of the curve L is one, the cycloid AB, the root circular arc BC, the outer circular arc CD, the involute DE, the inner The circular arc EF and the tooth top circular arc FA are connected end-to-end in sequence to form the end face profile of the rotor of the single-head vacuum pump, and the distance d1 and the distance d2 are equal. 8 . The vacuum pump rotor according to claim 1 , wherein the number of the curves L is two, and the two curves L are connected end-to-end in sequence to form the end face profile of the double-head vacuum pump rotor. 9 . 9 . The 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 . 10. A vacuum pump, characterized in that it comprises a pump body and two vacuum pump rotors according to any one of claims 1-9, and the two vacuum pump rotors mesh with each other; The point A, the root arc BC, the outer arc CD and the involute DE of the end profile of one of the vacuum pump rotors are respectively used to mesh with the cycloid AB of the end profile of the other vacuum pump rotor , Addendum arc FA, inner arc EF and involute DE.

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