Double-tooth claw type pump rotor and vacuum pump thereof

Abstract

The invention relates to the field of vacuum pumps, and discloses a double-tooth claw type pump rotor and a vacuum pump thereof.The double-tooth claw type pump rotor is characterized in that a first rotor and the first rotor are in central symmetry about the rotor shaft rotation center # imgabs0 # of the first rotor, and the upper half portion rotor profile of the first rotor comprises a long-amplitude epicycloid # imgabs1 #, a tooth crest arc # imgabs2 # with the radius being R, a conjugate curve # imgabs3 # and an epicycloid # imgabs4 #; the first rotor is a tooth root arc # imgabs5 # with the radius of r, and the rotor profile of the upper half part of the first rotor is composed of two epicycloids, two arcs and a conjugate curve, so that it is guaranteed that gas can be compressed, and leakage is reduced; the air tightness and the volume utilization coefficient of the pump are improved; the rotor molded line of the first rotor and the rotor molded line of the second rotor are consistent, the molded lines are self-meshed, only one molded line needs to be machined and programmed, and manufacturing is convenient.

Description

Technical Field

[0001] The present invention relates to the field of vacuum pumps, and more particularly to a double-claw pump rotor and a vacuum pump thereof. Background Art

[0002] In the structure of claw-type dry vacuum pump, multi-stage rotors are generally connected in series, or Roots rotors and multi-stage rotors are connected in series to form a multi-stage claw-type dry vacuum pump; the core component of the claw-type dry vacuum pump is the rotor, and the multi-claw rotor has better exhaust volume;

[0003] The existing multi-claw rotors mostly have a concave and convex shape with a sudden change in curvature, and the rotor profiles of the two rotors are different, resulting in poor sealing performance. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the object of the present invention is to provide a double-claw pump rotor and a vacuum pump thereof, which are used to reduce leakage and achieve consistent profiles of the two rotors.

[0005] To achieve the above object, the present invention provides the following technical solution: a double-claw pump rotor, comprising a first rotor, wherein the first rotor rotates about its own rotor axis. The rotor profile of the upper half of the first rotor is symmetrical and includes a long epicycloid , the tooth top arc with radius R , conjugate curve , epicycloid , tooth root arc with radius r ;

[0006] Among them, point For sharp points, points ,point ,point and point are the common tangent points of two adjacent curve segments;

[0007] The long epicycloid and epicycloid The coordinate equations are:

[0008]

[0009] Where, is a parameter with a value range of [0° to 】, is the value when X=A, =R+r, R is the radius of the tooth top circle, r is the radius of the tooth root circle.

[0010] As a further improvement of the present invention, the conjugate curve For involute, the conjugate curve The coordinate equation is:

[0011]

[0012] Where, is the base circle radius.

[0013] As a further improvement of the present invention, the second rotor further comprises a second rotor, the second rotor rotating about its own rotor axis The first rotor and the second rotor are centrally symmetrical. and The midpoints of the connecting lines are symmetrical.

[0014] A vacuum pump comprises the above-mentioned double-claw pump rotor.

[0015] The beneficial effects of the present invention are as follows: the rotor profile of the upper half of the first rotor in the present invention is composed of two epicycloids, two circular arcs and a conjugate curve, thereby ensuring that the gas can be compressed and reducing leakage; improving the air tightness and volume utilization coefficient of the pump; the rotor profile of the first rotor is consistent with the rotor profile of the second rotor, and the profile is self-engaging, and only one profile needs to be processed and programmed, which is convenient for manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the rotor profile of the present invention;

[0017] Figure 2 It is a state diagram of the first rotor profile and the second rotor profile in the present invention. DETAILED DESCRIPTION

[0018] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments. Identical components are denoted by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom," "top," "inner," and "outer" refer to directions toward or away from the geometric center of a particular component, respectively.

[0019] Reference Figures 1 to 2 As shown, a double-claw pump rotor of this embodiment includes a first rotor, the first rotor rotates about its own rotor axis. The rotor profile of the upper half of the first rotor includes a long epicycloid. , the tooth top arc with radius R , conjugate curve , epicycloid , tooth root arc with radius r ;

[0020] In addition, the rotor profile of the lower half of the first rotor and the rotor profile of the upper half of the first rotor are aligned with the rotor axis rotation center. Centrosymmetric; the rotor profile of the lower half of the first rotor includes a long epicycloid , the tooth top arc with radius R , conjugate curve , epicycloid , tooth root arc with radius r .

[0021] Among them, point For sharp points, points ,point ,point and point are the common tangent points of two adjacent curve segments; is the intersection point of two adjacent curve segments.

[0022] like Figure 1 As shown, the long epicycloid and tooth tip arc Intersect at point , conjugate curve and epicycloid At the point Tangent, tooth root arc and the long epicycloid in the rotor profile of the lower half of the first rotor At the point tangent;

[0023] Long epicycloid and epicycloid The coordinate equations of are;

[0024]

[0025] Where, is a parameter with a value range of [0° to 】, is the value when X=A, =R+r, R is the radius of the tooth top circle, r is the radius of the tooth root circle.

[0026] Through the long epicycloid and epicycloid The setting can make the rotor profile of the first rotor and the rotor profile of the second rotor consistent and achieve self-meshing.

[0027] The rotor profile of the upper half of the first rotor is composed of two epicycloids, two circular arcs and a conjugate curve, thereby ensuring that the gas can be compressed and reducing leakage; thereby improving the air tightness and volume utilization coefficient of the pump.

[0028] Preferably, the conjugate curve is an involute, a conjugate curve The coordinate equation is:

[0029]

[0030] Where, is the base circle radius.

[0031] In addition, a second rotor is included, and the second rotor rotates about its own rotor axis. The first rotor and the second rotor are symmetrical about the center. and The midpoints of the connecting lines are centrally symmetrical;

[0032] The rotor profile of the first rotor is consistent with the rotor profile of the second rotor, and the profiles are self-engaging. Only one profile needs to be processed and programmed, which is convenient for manufacturing.

[0033] A vacuum pump comprises the above-mentioned double-claw pump rotor.

[0034] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the principles of the present invention are within the scope of protection of the present invention. It should be noted that improvements and modifications that do not depart from the principles of the present invention are within the scope of protection of the present invention.

Claims

1. A double-claw pump rotor, characterized in that: The first rotor includes a first rotor having a rotation center about its own rotor axis. The rotor profile of the upper half of the first rotor is symmetrical and includes a long epicycloid , the tooth top arc with radius R , conjugate curve , epicycloid , tooth root arc with radius r ; Among them, point For sharp points, points ,point ,point and point are the common tangent points of two adjacent curve segments; The long epicycloid and epicycloid The coordinate equations are: Where, is a parameter with a value range of [0° to 】, is the value when X=A, =R+r, R is the radius of the tooth top circle, r is the radius of the tooth root circle.

2. A double-claw pump rotor according to claim 1, characterized in that: The conjugate curve For involute, the conjugate curve The coordinate equation is: Where, is the base circle radius.

3. A double-claw pump rotor according to claim 1, characterized in that: Also included is a second rotor, the second rotor having a rotation center about its own rotor axis The first rotor and the second rotor are centrally symmetrical. and The midpoints of the connecting lines are symmetrical.

4. A vacuum pump, characterized in that: A double-claw pump rotor comprising the invention as claimed in any one of claims 1 to 3.

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