阅读说明：本技术 一种全椭圆及椭圆包络型双螺杆转子及压缩机、膨胀机 (Full-ellipse and ellipse enveloping type double-screw rotor, compressor and expander ) 是由 李丹童 何志龙 韦炜 林栋� 邢子文 于 2019-11-01 设计创作，主要内容包括：一种全椭圆及椭圆包络型双螺杆转子及压缩机、膨胀机,包括在转动过程中能够实现相互啮合的阳转子和阴转子,阳转子型线的单齿齿形由首尾依次连接的齿根圆弧段,椭圆包络线段,椭圆弧段,椭圆弧段,椭圆包络线段组成；阴转子型线的单齿齿形由首尾依次连接的齿顶圆弧段,椭圆弧段,椭圆包络线段,椭圆包络线段,椭圆段组成；阳转子型线与阴转子型线各自的相邻曲线段交点处连续且斜率连续；按照阴阳转子型线的齿数分别进行重复旋转生成单齿齿形,并依次首尾连接而生成完整的阴阳转子型线。本发明转子型线全部由椭圆及其包络线组成,消除了尖点,并且依据设计工况需要,转子形状灵活可调,提高了性能。(A full-ellipse and ellipse enveloping type double-screw rotor, a compressor and an expander comprise a male rotor and a female rotor which can be meshed with each other in the rotating process, wherein the single-tooth profile of the male rotor profile consists of a tooth root arc section, an ellipse enveloping line section, an ellipse arc section and an ellipse enveloping line section which are sequentially connected end to end; the single-tooth profile of the female rotor profile consists of an addendum circular arc section, an elliptic envelope line section and an elliptic section which are sequentially connected end to end; the intersection points of the adjacent curve sections of the male rotor molded line and the female rotor molded line are continuous and have continuous slopes; and respectively carrying out repeated rotation according to the tooth number of the female-male rotor molded line to generate a single-tooth form, and sequentially connecting the teeth end to generate a complete female-male rotor molded line. The rotor profile of the invention is composed of ellipse and envelope line, eliminating sharp point, and according to the design condition, the shape of the rotor is flexible and adjustable, improving the performance.)

1. A full-ellipse and ellipse enveloping type double-screw rotor is characterized in that: comprising a male rotor and a female rotor which can be brought into engagement with each other during rotation, the profile A of the male rotor profile being single-tooth₁A₂A₃A₄A₅A₆The tooth root arc sections A are connected in sequence from head to tail₁A₂Elliptical envelope line segment A₂A₃Oval arc segment A₃A₄Oval arc segment A₄A₅Elliptical envelope line segment A₅A₆Composition is carried out; single tooth profile B of female rotor profile₁B₂B₃B₄B₅B₆Addendum arc section B sequentially connected from head to tail₁B₂Oval arc section B₂B₃Line segment B of ellipse envelope₃B₄Line segment B of ellipse envelope₄B₅Oval segment B₅B₆Composition is carried out; wherein, the line segment A in the molded line_iA_i+1And line segment B_iB_i+1(i ═ 1,2,3,4,5)) to engage; male rotor profile A₁A₂A₃A₄A₅A₆The intersection point of the adjacent curve segments is continuous and the slope is continuous; female rotor profile B₁B₂B₃B₄B₅B₆The intersection point of the adjacent curve segments is continuous and the slope is continuous; number of teeth n according to the profile of the male-female rotor₁、n₂Respectively repeatedly rotating to generate n₁、n₂The single-tooth shapes are arranged in a strip manner and are sequentially connected end to generate a complete female-male rotor profile.

2. The fully elliptical and elliptical envelope type twin screw rotor as defined in claim 1 wherein:

the addendum circle radius of the female rotor profile is r_fC is the parameter center distance, and the tooth root circular arc section A₁A₂The parameter equation of (1) is as follows:

wherein the content of the first and second substances,∠A₂O_mA₆by solving for curve segment A₂A₃A₄A₅A₆This is given later.

3. The fully elliptical and elliptical envelope type twin screw rotor as defined in claim 1 wherein:

elliptical envelope line segment A of male rotor molded line₂A₃Elliptical arc section B of female rotor profile₂B₃Meshing with each other;

elliptical envelope line segment A₂A₃The parameter equation of (1) is as follows:

c is a parameter center distance and is introduced into the elliptical arc section B₂B₃The parameter equation of (2):

so as to obtain the compound with the characteristics of,

wherein r is_fIs yinThe relationship of rotor tooth tip radii, α, and θ, is derived from the meshing theorem and is expressed as:

wherein the parameters

4. The fully elliptical and elliptical envelope type twin screw rotor as defined in claim 1 wherein:

elliptical arc section A of male rotor profile₃A₄The parameter equation of (1) is as follows:

wherein the parameters

5. The fully elliptical and elliptical envelope type twin screw rotor as defined in claim 1 wherein:

elliptical arc section A of male rotor profile₄A₅The parameter equation of (1) is as follows:

wherein the parameters

6. The fully elliptical and elliptical envelope type twin screw rotor as defined in claim 1 wherein:

elliptical envelope line segment A of male rotor molded line₅A₆Elliptical arc section B of female rotor profile₅B₆The two parts are engaged with each other,

elliptical envelope line segment A₅A₆The parameter equation of (1) is as follows:

c is a parameter center distance and is introduced into the elliptical arc section B₅B₆The parameter equation of (2):

so as to obtain the compound with the characteristics of,

wherein r is_fThe relationship between α and θ, which is the radius of the tooth top circle of the female rotor, is derived from the meshing theorem and is expressed as:

wherein the parameters

7. The fully elliptical and elliptical envelope type twin screw rotor as defined in claim 1 wherein:

the addendum circle radius of the male rotor profile is r_mAddendum circle arc segment B₁B₂The parameter equation of (1) is as follows:

wherein

8. The fully elliptical and elliptical envelope type twin screw rotor as defined in claim 1 wherein:

oval segment B of female rotor profile₂B₃Elliptical envelope line segment A with male rotor profile₂A₃Meshing with each other;

oval segment B₂B₃The parameter equation of (1) is as follows:

wherein the parameters

elliptical envelope line segment B of female rotor molded line₃B₄With an elliptical arc segment A₃A₄Meshing, the parametric equation of which is expressed as:

c is a parameter center distance and is introduced into the elliptical arc section A₃A₄The parameter equation of (2):

so as to obtain the compound with the characteristics of,

wherein r is_mFor the addendum radius of the male rotor profile, the relationship between α and θ can be derived from the meshing theorem and is expressed as:

wherein the parameters For a designable variable, n₁Number of teeth of male rotor, n₂The number of teeth of the female rotorAfter all the curve segments are solved, the geometrical condition that the intersection points of the adjacent curve segments are continuous and the slopes are continuous is utilized to solve the problem.

9. The fully elliptical and elliptical envelope type twin screw rotor as defined in claim 1 wherein:

elliptical envelope line segment B of female rotor molded line₄B₅With elliptical arc segment A of the male rotor profile₄A₅Meshing with each other;

elliptical envelope line segment B₄B₅The parameter equation of (1) is as follows:

c is a parameter center distance and is introduced into the elliptical arc section A₄A₅The parameter equation of (2):

so as to obtain the compound with the characteristics of,

wherein r is_mFor the male rotor addendum radius, the relationship between α and θ can be derived from the meshing theorem and is expressed as:

wherein the parameters

elliptical arc segment B of female rotor profile₅B₆The parameter equation of (1) is as follows:

wherein the parameters

10. A compressor or expander having a fully elliptical and elliptical envelope type twin screw rotor as defined in any one of claims 1 to 9.

Technical Field

The invention belongs to the field of mechanical design, and relates to a full-ellipse and ellipse enveloping type double-screw rotor, a compressor and an expander.

Background

The double-screw compressor is a positive displacement rotary pump, can be used for obtaining high-pressure fluid and transporting fluid working media, and has wide application in modern industry. The double-screw compressor inherits the advantages of long service life of the rotary machine, reliable operation, small vibration, low noise, stable work, no surge phenomenon and the like, has the characteristics of no wearing parts such as an air valve and the like, forced air suction and exhaust, simple processing and the like, and is the main type of units such as the air compressor, the commercial refrigerator and the like. The core components of the double-screw compressor are two rotors, the structure of the rotors is determined by the selection of the rotor profiles, so that the overall operation performance of the compressor is influenced, and the optimal design of the rotors is also a key technology for manufacturing the high-performance double-screw compressor. However, the original molded line of the rotor of the existing double-screw compressor has sharp points, so that the abrasion resistance of the rotor is poor, and the flow resistance loss of the working medium is large. The problem that the design parameter space of the arc envelope type double-screw rotor profile with the sharp point is insufficient can be solved, and the performance of the rotor profile cannot be optimized.

Disclosure of Invention

The invention aims to solve the problems that the molded line of the double-screw rotor in the prior art has sharp points and the space of design parameters is insufficient, and provides a full-ellipse and ellipse enveloping type double-screw rotor, a compressor and an expander.

In order to achieve the purpose, the invention has the following technical scheme:

a full-elliptic or elliptic double-screw rotor is composed of male and female rotors engaged with each other during rotation, and the single-tooth profile A of male rotor₁A₂A₃A₄A₅A₆The tooth root arc sections A are connected in sequence from head to tail₁A₂Elliptical envelope line segment A₂A₃Oval arc segment A₃A₄Oval arc segment A₄A₅Elliptical envelope line segment A₅A₆Composition is carried out; single tooth profile B of female rotor profile₁B₂B₃B₄B₅B₆Addendum arc section B sequentially connected from head to tail₁B₂Oval arc section B₂B₃Line segment B of ellipse envelope₃B₄Line segment B of ellipse envelope₄B₅Oval segment B₅B₆Composition is carried out; wherein, the line segment A in the molded line_iA_i+1And line segment B_iB_i+1(i ═ 1,2,3,4,5)) to engage; male rotor profile A₁A₂A₃A₄A₅A₆The intersection point of the adjacent curve segments is continuous and the slope is continuous; female rotor profile B₁B₂B₃B₄B₅B₆The intersection point of the adjacent curve segments is continuous and the slope is continuous; number of teeth n according to the profile of the male-female rotor₁、n₂Respectively repeatedly rotating to generate n₁、n₂The single-tooth shapes are arranged in a strip manner and are sequentially connected end to generate a complete female-male rotor profile.

The addendum circle radius of the female rotor profile is r_fC is the parameter center distance, and the tooth root circular arc section A₁A₂The parameter equation of (1) is as follows:

wherein the content of the first and second substances,

∠A₂O_mA₆by solving for curve segment A₂A₃A₄A₅A₆This is given later.

Elliptical envelope line segment A of male rotor molded line₂A₃Elliptical arc section B of female rotor profile₂B₃Meshing with each other;

elliptical envelope line segment A₂A₃The parameter equation of (1) is as follows:

c is the center distance of the parameterElliptic arc section B₂B₃The parameter equation of (2):

so as to obtain the compound with the characteristics of,

wherein r is_fThe relationship between α and θ, which is the radius of the tooth top circle of the female rotor, is derived from the meshing theorem and is expressed as:

wherein the parameters

For a designable variable, n₁Number of teeth of male rotor, n₂The number of teeth of the female rotor

After all the curve segments are solved, the geometrical condition that the intersection points of the adjacent curve segments are continuous and the slopes are continuous is utilized to solve the problem.

Elliptical arc section A of male rotor profile₃A₄The parameter equation of (1) is as follows:

wherein the parametersTo a designable variable, r_mRadius of addendum circle of male rotorAfter all the curve segments are solved, the geometrical condition that the intersection points of the adjacent curve segments are continuous and the slopes are continuous is utilized to solve the problem.

Elliptical arc section A of male rotor profile₄A₅The parameter equation of (1) is as follows:

wherein the parameters

To a designable variable, r_mRadius of addendum circle of male rotor

After all the curve segments are solved, the geometrical condition that the intersection points of the adjacent curve segments are continuous and the slopes are continuous is utilized to solve the problem.

Elliptical envelope line segment A of male rotor molded line₅A₆Elliptical arc section B of female rotor profile₅B₆The two parts are engaged with each other,

elliptical envelope line segment A₅A₆The parameter equation of (1) is as follows:

c is a parameter center distance and is introduced into the elliptical arc section B₅B₆The parameter equation of (2):

so as to obtain the compound with the characteristics of,

wherein r is_fThe relationship between α and θ, which is the radius of the tooth top circle of the female rotor, is derived from the meshing theorem and is expressed as:

wherein the parameters

For a designable variable, n₁Number of teeth of male rotor, n₂The number of teeth of the female rotor

After all the curve segments are solved, the geometrical condition that the intersection points of the adjacent curve segments are continuous and the slopes are continuous is utilized to solve the problem.

The addendum circle radius of the male rotor profile is r_mAddendum circle arc segment B₁B₂The parameter equation of (1) is as follows:

wherein

∠B₂O_fB₆By solving for curve segment B₂B₃B₄B₅B₆This is given later.

Oval segment B of female rotor profile₂B₃Elliptical envelope line segment A with male rotor profile₂A₃Meshing with each other;

oval segment B₂B₃The parameter equation of (1) is as follows:

wherein the parameters

To a designable variable, r_fRadius of the tooth top of the female rotor

After all curve segments are solved, the geometrical condition that the intersection points of adjacent curve segments are continuous and the slope is continuous is utilized to solve;

elliptical envelope line segment B of female rotor molded line₃B₄With an elliptical arc segment A₃A₄Meshing, the parametric equation of which is expressed as:

c is a parameter center distance and is introduced into the elliptical arc section A₃A₄The parameter equation of (2):

so as to obtain the compound with the characteristics of,

wherein r is_mFor the addendum radius of the male rotor profile, the relationship between α and θ can be derived from the meshing theorem and is expressed as:

wherein the parameters

For a designable variable, n₁Number of teeth of male rotor, n₂The number of teeth of the female rotor

After all the curve segments are solved, the geometrical condition that the intersection points of the adjacent curve segments are continuous and the slopes are continuous is utilized to solve the problem.

Elliptical envelope line segment B of female rotor molded line₄B₅With elliptical arc segment A of the male rotor profile₄A₅Meshing with each other;

elliptical envelope line segment B₄B₅The parameter equation of (1) is as follows:

c is a parameter center distance and is introduced into the elliptical arc section A₄A₅The parameter equation of (2):

so as to obtain the compound with the characteristics of,

wherein r is_mFor the male rotor addendum radius, the relationship between α and θ can be derived from the meshing theorem and is expressed as:

wherein the parametersFor a designable variable, n₁Number of teeth of male rotor, n₂The number of teeth of the female rotor

After all curve segments are solved, the geometrical condition that the intersection points of adjacent curve segments are continuous and the slope is continuous is utilized to solve;

elliptical arc segment B of female rotor profile₅B₆The parameter equation of (1) is as follows:

wherein the parameters

To a designable variable, r_fRadius of the tooth top of the female rotor

After all the curve segments are solved, the geometrical condition that the intersection points of the adjacent curve segments are continuous and the slopes are continuous is utilized to solve the problem.

The invention also provides a compressor or an expander, which is provided with the full-ellipse and ellipse enveloping type double-screw rotor.

Compared with the prior art, the invention has the following beneficial effects:

the double-screw rotor adopts the molded lines, so that sharp points can be eliminated, and the shape of the molded lines of the rotor can be flexibly adjusted according to the requirement of design working conditions, so that the volume efficiency, the energy-saving performance, the stress performance and the like of the optimized double-screw compressor and the expander are improved. Compared with other conventional pump types, the pump has the advantages of few easily-damaged parts, compact structure, high air suction rate, no surge, low vibration noise and the like.

Drawings

FIG. 1 is a schematic view of an original rotor profile;

FIG. 2 is a 5/6 tooth rotor profile schematic of the present invention;

FIG. 3 rotor profile parameters of the present invention

A geometric schematic;

FIG. 4 rotor profile parameters of the present invention

A geometric schematic;

FIG. 5 is a 4/6 tooth rotor profile schematic of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, in the original screw rotor profile, a is in the left side male rotor profile₁A₂A₃A₄A₅In the form of a single-tooth profile, a single-tooth profile A₁A₂A₃A₄A₅Line origin O of wound male rotor profile_mRotate

Then with tooth form A₁A₂A₃A₄A₅End to end, thus repeating n₁After that, a left male rotor profile is formed, where n₁Representing the number of teeth, n in FIG. 1₁Was taken as 5. Likewise, the right female rotor profile likewise consists of a single-tooth profile B₁B₂B₃B₄And (6) determining the unique decision. In the original tooth form, A₁A₂A₃A₄A₅Formed by arc segments A₁A₂Point-meshing epicycloidal segment A₂A₃Arc segment A₃A₄Outer cycloid segment A₄A₅Composition B₁B₂B₃B₄From a circular arc section B₁B₂Circular arc envelope line segment B₂B₃Point-meshing epicycloidal segment B₃B₄And (4) forming. Outer diameter of the male rotor is defined by r_mThe corresponding pitch circle radius is represented by r_pmThe outer diameter of the female rotor is represented by r_fThe corresponding pitch circle radius is represented by r_fmIndicating the center distance O between the two rotors_mO_fIs c, r in the original profile_f＝r_pf. The type line is formed by a parameter O_mO_f，n₁，n₂，r_mAnd arc segment A₃A₄Is uniquely determined, which results in a division by B₃All points except the points are sharp points, so that the rotor has the problems of large abrasion and large flow resistance of the working medium in the running process.

Referring to fig. 2, the present invention relates to the cusp B of the original rotor profile₂And a sharp point B₄Is changed into an elliptic arc section B₂B₃And an elliptical arc section B₅B₆Corresponding to the elliptical arc section B₂B₃Engaged curve segment A₂A₃The envelope line segment of the corresponding ellipse and the elliptical arc segment B₅B₆Engaged curve segment A₅A₆Are the envelope segments of the respective ellipses. The sharp point A of the original rotor profile₄And arc segment A₃A₄Is changed into an elliptical arc section A₄A₅And an elliptical arc segment A₃A₄To correspond toAnd an elliptical arc segment A₄A₅Engaged curve segment B₄B₅The envelope line segment of the corresponding ellipse and the elliptical arc segment A₃A₄Engaged curve segment B₃B₄Is an envelope line segment of a corresponding ellipse, thereby solving the problem of sharp points of the original rotor profile. Single tooth profile A of left male rotor profile of twin-screw compressor in FIG. 2₁A₂A₃A₄A₅A₆The tooth root arc sections A are connected in sequence from head to tail₁A₂Elliptical envelope line segment A₂A₃Oval arc segment A₃A₄Oval arc segment A₄A₅Elliptical envelope line segment A₅A₆And (4) forming. Single tooth profile B of right female rotor profile of twin-screw compressor in FIG. 2₁B₂B₃B₄B₅B₆Addendum arc section B sequentially connected from head to tail₁B₂Oval arc section B₂B₃Line segment B of ellipse envelope₃B₄Line segment B of ellipse envelope₄B₅Oval segment B₅B₆And (4) forming. During the rotation meshing process, the correct meshing can be realized, and the line segment A_iA_i+1And line segment B_iB_i+1(i ═ 1,2,3,4,5)) is engaged.

The line of the male and female rotors is determined by the parameter of the center distance c and the number of teeth n of the male rotor₁Number of teeth n of female rotor₂Radius of addendum circle of male rotor_mRadius of addendum circle of female rotor_fAnd an elliptical arc segment A₃A₄、A₄A₅、B₂B₃、B₅B₆Is uniquely determined by the length of the major and minor axes.

The addendum circle radius of the female rotor profile is r_fLeft side male rotor molded line tooth root arc segment A₁A₂The parameter equation of (1) is as follows:

wherein

∠A₂O_mA₆By solving for curve segment A₂A₃A₄A₅A₆This is given later.

Elliptic envelope line segment A of left side male rotor molded line₂A₃And an elliptical arc section B₂B₃The parameter equation of the meshing can be expressed as:

into an elliptical arc section B₂B₃The parameter equation of (2):

it is possible to obtain,

where the relationship between α and θ can be derived from the meshing theorem and is expressed as:

wherein the parametersThe geometric meaning for the programmable variables is shown in FIG. 3. Parameter(s)

After all the curve segments are solved, the geometrical condition that the intersection points of the adjacent curve segments are continuous and the slopes are continuous is utilized to solve the problem.

Elliptic arc section A of left side male rotor profile₃A₄The parameter equation of (1) is as follows:

wherein the parameters

The geometric meaning of the programmable variables is shown in FIG. 4. Parameter(s)After all the curve segments are solved, the geometrical condition that the intersection points of the adjacent curve segments are continuous and the slopes are continuous is utilized to solve the problem.

Elliptic arc section A of left side male rotor profile₄A₅The parameter equation of (1) is as follows:

wherein the parametersThe geometric meaning of the programmable variables is shown in FIG. 4. Parameter(s)

After all the curve segments are solved, the geometrical condition that the intersection points of the adjacent curve segments are continuous and the slopes are continuous is utilized to solve the problem.

Elliptic envelope line segment A of left side male rotor molded line₅A₆And an elliptical arc section B₅B₆The parameter equation of the meshing can be expressed as:

into an elliptical arc section B₅B₆The parameter equation of (2):

it is possible to obtain,

where the relationship between α and θ can be derived from the meshing theorem and is expressed as:

wherein the parameters

The geometric meaning of the programmable variables is shown in FIG. 3. Parameter(s)

After all the curve segments are solved, the geometrical condition that the intersection points of the adjacent curve segments are continuous and the slopes are continuous is utilized to solve the problem.

The invention relates to a left male rotor profile A₁A₂A₃A₄A₅A₆Are continuous and have a continuous slope at the intersection of adjacent curve segments.

The addendum circle radius of the male rotor profile is r_mTooth top arc section B of right female rotor profile₁B₂The parameter equation of (1) is as follows:

wherein

∠B₂O_fB₆By solving for curve segment B₂B₃B₄B₅B₆This is given later.

Oval section B of right female rotor profile₂B₃With an elliptical envelope line segment A₂A₃The parameter equation of the meshing can be expressed as:

wherein the parameters

The geometric meaning for the programmable variables is shown in FIG. 3. Parameter(s)

After all the curve segments are solved, the geometrical condition that the intersection points of the adjacent curve segments are continuous and the slopes are continuous is utilized to solve the problem.

The parameters and the elliptical envelope line segment A in the above equation₂A₃The same name parameter of (2) is the same parameter.

Elliptic envelope line segment B of right female rotor molded line₃B₄With an elliptical arc segment A₃A₄The parameter equation of the meshing can be expressed as:

into an elliptical arc section A₃A₄The parameter equation of (2):

it is possible to obtain,

where the relationship between α and θ can be derived from the meshing theorem and is expressed as:

wherein the parametersThe geometric meaning for the programmable variables is shown in fig. 4. Parameter(s)

After all the curve segments are solved, the geometrical condition that the intersection points of the adjacent curve segments are continuous and the slopes are continuous is utilized to solve the problem.

Parameters and elliptical arc segment A in the above equation₃A₄The same name parameter of (2) is the same parameter.

Elliptic envelope line segment B of right female rotor molded line₄B₅With an elliptical arc segment A₄A₅The parameter equation of the meshing can be expressed as:

into an elliptical arc section A₄A₅The parameter equation of (2):

it is possible to obtain,

where the relationship between α and θ can be derived from the meshing theorem and is expressed as:

wherein the parameters

The geometric meaning for the programmable variables is shown in FIG. 3. Parameter(s)

After all the curve segments are solved, the geometrical condition that the intersection points of the adjacent curve segments are continuous and the slopes are continuous is utilized to solve the problem.

Parameters and elliptical arc segment A in the above equation₄A₅The same name parameter of (2) is the same parameter.

Elliptical arc of right female rotor profileSegment B₅B₆The parameter equation of (1) is as follows:

wherein the parameters

The geometric meaning for the programmable variables is shown in FIG. 3. Parameter(s)

After all the curve segments are solved, the geometrical condition that the intersection points of the adjacent curve segments are continuous and the slopes are continuous is utilized to solve the problem.

The parameters and the elliptical envelope line segment A in the above equation₅A₆The same name parameter of (2) is the same parameter.

Right female rotor profile B of the invention₁B₂B₃B₄B₅B₆Are continuous and have a continuous slope at the intersection of adjacent curve segments.

The single tooth profile independent parameters of the double-screw rotor profile include the center distance c and the number of the male rotor teeth n₁Number of teeth n of female rotor₂Radius of addendum circle of male rotor_mRadius of addendum circle of female rotor_fOval arc segment A₃A₄Length of major and minor axes

Elliptic arc section A₄A₅Length of major and minor axesElliptic arc section B₂B₃Length of major and minor axes

Elliptic arc section B₅B₆Length of major and minor axes

Double-screw male-female rotor profileNumber of teeth n according to the profile of the male-female rotor₁、n₂Respectively repeatedly rotating to generate n₁、n₂The single-tooth profile is formed by connecting the single-tooth profiles end to end in sequence, and typical 5/6 teeth and 4/6 tooth profiles are shown in figures 2 and 3.

The design process in the specific application of the invention is as follows:

1. the central distance c and the number of the teeth n of the male rotor are optimized according to the volume and the pumping speed₁Number of teeth n of female rotor₂Radius of addendum circle of male rotor_mRadius of addendum circle of female rotor_fAnd n is shown in FIG. 2₁＝5,n₂As 6, n is shown in fig. 5₁＝4,n₂＝6

2. The elliptical arc section A is preferably selected according to the requirements of gas tightness, stress performance and pumping rate₃A₄Length of major and minor axes

Elliptic arc section A₄A₅Length of major and minor axes

Elliptic arc section B₂B₃Length of major and minor axes

Elliptic arc section B₅B₆Length of major and minor axes

The geometric meaning of the parameters is shown in figures 3 and 4

3. The solution of the curve is performed using the preferred parameters described above.

The double-screw rotor adopts the molded line of the invention to eliminate sharp points, and can flexibly adjust the shape of the rotor molded line according to the design working condition requirements, thereby improving the volume efficiency, the energy-saving performance, the stress performance and the like of the optimized double-screw compressor. Compared with other conventional pump types, the pump has the advantages of few easily-damaged parts, compact structure, high air suction rate, no surge, low vibration noise and the like.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical solution of the present invention, and it should be understood by those skilled in the art that the technical solution can be modified and replaced by a plurality of simple modifications and replacements without departing from the spirit and principle of the present invention, and the modifications and replacements also fall within the protection scope defined by the claims.