阅读说明：本技术 一种用于干式螺杆真空泵的锥形转子 (Conical rotor for dry screw vacuum pump ) 是由 孔伟杰 田文中 于 2021-08-02 设计创作，主要内容包括：本发明公开了一种用于干式螺杆真空泵的锥形转子,包括共轭的一对锥形转子、第一螺杆及第二螺杆；共轭的一对锥形转子包括第一转子及第二转子；第一转子包括第一锥形齿顶面、第一凹曲面、第一斜曲面及第一锥形齿底面,第二转子包括第二锥形齿顶面、第二凹曲面、第二斜曲面及第二锥形齿底面,第一锥形齿顶面与第二锥形齿底面在空间轴向剖视图上曲面共轭,第二锥形齿顶面与第一锥形齿底面在空间轴向剖视图上相切,第一斜曲面与第二斜曲面在空间轴向剖视图上曲面共轭,第一凹曲面与第二凹曲面在三维空间上会形成一个不干涉的密封。优化了气体在在泵体内的压缩,更方便专配和加工,提高螺杆加工效率；同时提高气体内压缩的效果。(The invention discloses a conical rotor for a dry screw vacuum pump, which comprises a pair of conjugated conical rotors, a first screw and a second screw; the conjugated pair of conical rotors comprises a first rotor and a second rotor; the first rotor comprises a first conical tooth top surface, a first concave curved surface, a first oblique curved surface and a first conical tooth bottom surface, the second rotor comprises a second conical tooth top surface, a second concave curved surface, a second oblique curved surface and a second conical tooth bottom surface, the first conical tooth top surface and the second conical tooth bottom surface are conjugated in a space axial cross section, the second conical tooth top surface and the first conical tooth bottom surface are tangent in the space axial cross section, the first oblique curved surface and the second oblique curved surface are conjugated in the space axial cross section, and the first concave curved surface and the second concave curved surface can form a non-interference seal in a three-dimensional space. The compression of the gas in the pump body is optimized, the special allocation and the processing are more convenient, and the processing efficiency of the screw is improved; and simultaneously, the effect of internal compression of the gas is improved.)

1. A conical rotor for a dry screw vacuum pump, characterized by: comprises a pair of conjugated conical rotors (1), a first screw (2) and a second screw (3);

the conjugated pair of conical rotors (1) comprises a first rotor (4) and a second rotor (5);

the first rotor (4) comprises a first conical tooth crest (6), a first concave curved surface (7), a first inclined curved surface (8) and a first conical tooth bottom surface (9),

the first concave curved surface (7) and the first inclined curved surface (8) extend spirally along the distribution direction of the first conical tooth crest (6) and the first conical tooth bottom surface (9);

the second rotor (5) comprises a second conical tooth crest (10), a second concave curved surface (11), a second inclined curved surface (12) and a second conical tooth bottom surface (13),

the second concave curved surface (11) and the second inclined curved surface (12) extend spirally along the distribution direction of the second conical tooth top surface (10) and the second conical tooth bottom surface (13);

the first conical tooth crest (6) and the second conical tooth bottom surface (13) are in curved surface conjugate on a space axial cross section, the second conical tooth crest (10) and the first conical tooth bottom surface (9) are tangent on the space axial cross section, the first inclined curved surface (8) and the second inclined curved surface (12) are in curved surface conjugate on the space axial cross section, and the first concave curved surface (7) and the second concave curved surface (11) can form non-interference seal on a three-dimensional space.

2. A conical rotor for a dry screw vacuum pump according to claim 1, characterized in that: the first rotor (4) and the second rotor (5) synchronously rotate in different directions in a double-rotation mode, and correct meshing can be achieved.

3. A conical rotor for a dry screw vacuum pump according to claim 1, characterized in that: the central axes of the first rotor (4) and the second rotor (5) are parallel.

4. A conical rotor for a dry screw vacuum pump according to claim 1, characterized in that: the first rotor (4) and the second rotor (5) are integrally conical.

Technical Field

The invention relates to the field of vacuum pumps, in particular to a conical rotor for a dry screw vacuum pump.

Background

In the design process of a screw vacuum pump rotor, a method for changing the screw pitch is adopted in China to control the gas compression from an air suction end to an air exhaust end, improve the vacuum degree of the vacuum pump, reduce the noise and reduce the temperature of a pump body. However, as the pitch is changed, the tooth tops of the screws become thinner, so that gas flows back from the narrowed tooth tops, and the gas flows back from the wider tooth tops. The cutting tool for processing with reduced pitch is not easy to enter, thus being not beneficial to mechanical processing; the domestic screw drawing is formed by sweeping the molded line of the end face along the spiral line or changing the change of the spiral line, and the technical difficulty is not too much. The two central axes of the cone-shaped rotor which is only registered in China are intersected after being prolonged, and the cone-shaped rotor is not beneficial to actual assembly and production. Two rotor central axis are parallel in the scheme that this application provided, accord with mechanical design basic logic, can also avoid the difficult problem of processing of variable pitch, improve gas compression's effect simultaneously.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a conical rotor for a dry screw vacuum pump.

In order to solve the technical problems, the technical scheme provided by the invention is a conical rotor for a dry screw vacuum pump, which comprises the following steps: comprises a pair of conjugated conical rotors, a first screw and a second screw;

the conjugated pair of conical rotors comprises a first rotor and a second rotor;

the first rotor comprises a first conical tooth crest surface, a first concave curved surface, a first inclined curved surface and a first conical tooth bottom surface,

the first concave curved surface and the first inclined curved surface extend spirally along the distribution direction of the top surface and the bottom surface of the first conical tooth;

the second rotor comprises a second conical tooth crest surface, a second concave curved surface, a second inclined curved surface and a second conical tooth bottom surface,

the second concave curved surface and the second inclined curved surface extend spirally along the distribution direction of the second conical tooth top surface and the second conical tooth bottom surface;

the first conical tooth crest surface and the second conical tooth bottom surface are conjugated in a space axial cross section, the second conical tooth crest surface and the first conical tooth bottom surface are tangent in the space axial cross section, the first oblique curved surface and the second oblique curved surface are conjugated in the space axial cross section, and the first concave curved surface and the second concave curved surface can form a non-interference seal in a three-dimensional space.

As an improvement, the first rotor and the second rotor synchronously rotate in different directions and rotate in two directions, and correct meshing can be achieved.

As a refinement, the first rotor and the second rotor central axis are parallel.

As a refinement, the first and second rotors are tapered as a whole.

Compared with the prior art, the invention has the advantages that: the compression of gas in the pump body is optimized, the gas compression ratio is greatly improved, the special allocation and processing are more convenient, and the screw processing efficiency is improved; the problem that the variable pitch is difficult to process is avoided, the effect of gas internal compression is improved, and the compression ratio is larger than that of the variable pitch.

Drawings

FIG. 1 is a schematic view of a conical rotor for a dry screw vacuum pump according to the present invention.

FIG. 2 is a schematic front view of a conical rotor for a dry screw vacuum pump according to the present invention.

FIG. 3 is a left side view of a conical rotor for a dry screw vacuum pump according to the present invention.

As shown in the figure: 1. a pair of conical rotors, 2, a first screw, 3, a second screw, 4, a first rotor, 5, a second rotor, 6, a first conical tooth crest, 7, a first concave curved surface, 8, a first oblique curved surface, 9, a first conical tooth bottom surface, 10, a second conical tooth crest, 11, a second concave curved surface, 12, a second oblique curved surface, 13, a second conical tooth bottom surface.

Detailed Description

The conical rotor for a dry screw vacuum pump according to the present invention will be described in further detail with reference to the accompanying drawings.

With reference to the attached drawings, the conical rotor for the dry screw vacuum pump comprises a pair of conjugated conical rotors 1, a first screw 2 and a second screw 3;

the conjugated pair of conical rotors 1 comprises a first rotor 4 and a second rotor 5;

the first rotor 4 comprises a first conical tooth crest 6, a first concave curved surface 7, a first inclined curved surface 8 and a first conical tooth bottom surface 9,

the first concave curved surface 7 and the first inclined curved surface 8 extend spirally along the distribution direction of the first conical tooth crest 6 and the first conical tooth bottom surface 9;

the second rotor 5 comprises a second conical tooth crest 10, a second concave curved surface 11, a second inclined curved surface 12 and a second conical tooth bottom surface 13,

the second concave curved surface 11 and the second inclined curved surface 12 extend spirally along the distribution direction of the second conical tooth crest 10 and the second conical tooth bottom surface 13;

the first conical tooth crest 6 and the second conical tooth bottom surface 13 are in curved surface conjugation on a spatial axial cross section, the second conical tooth crest 10 and the first conical tooth bottom surface 9 are tangent on the spatial axial cross section, the first inclined curved surface 8 and the second inclined curved surface 12 are in curved surface conjugation on the spatial axial cross section, and the first concave curved surface 7 and the second concave curved surface 11 can form a non-interference seal on a three-dimensional space.

The first rotor 4 and the second rotor 5 synchronously rotate in different directions and rotate in two directions, so that correct meshing can be realized.

The first rotor 4 and the second rotor 5 are parallel in central axis.

The first rotor 4 and the second rotor 5 are tapered as a whole.

The working principle of the invention is as follows: with reference to fig. 1-3, a conical rotor for a dry screw vacuum pump comprises a pair of conjugated conical rotors 1, a first screw 2 and a second screw 3; the conjugated pair of conical rotors 1 comprises a first rotor 4 and a second rotor 5; the first rotor 4 comprises a first conical tooth crest 6, a first concave curved surface 7, a first oblique curved surface 8 and a first conical tooth bottom surface 9, and the first concave curved surface 7 and the first oblique curved surface 8 extend spirally along the distribution direction of the first conical tooth crest 6 and the first conical tooth bottom surface 9; the second rotor 5 comprises a second conical tooth crest 10, a second concave curved surface 11, a second inclined curved surface 12 and a second conical tooth bottom surface 13, wherein the second concave curved surface 11 and the second inclined curved surface 12 extend spirally along the distribution direction of the second conical tooth crest 10 and the second conical tooth bottom surface 13; the first conical tooth crest 6 and the second conical tooth bottom surface 13 are in curved surface conjugate on a spatial axial sectional view, the second conical tooth crest 10 and the first conical tooth bottom surface 9 are tangent on the spatial axial sectional view, the first inclined curved surface 8 and the second inclined curved surface 12 are in curved surface conjugate on the spatial axial sectional view, and the first concave curved surface 7 and the second concave curved surface 11 can form a non-interference seal on a three-dimensional space.

The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.