CN217029301U

CN217029301U - Equal-outer-diameter bilateral asymmetric screw molded line

Info

Publication number: CN217029301U
Application number: CN202220686818.3U
Authority: CN
Inventors: 滕士龙
Original assignee: Wuxi Werner Compressor Co ltd
Current assignee: Wuxi Werner Compressor Co ltd
Priority date: 2022-03-28
Filing date: 2022-03-28
Publication date: 2022-07-22
Anticipated expiration: 2032-03-28

Abstract

The utility model provides a screw profile with equal outer diameter and two asymmetric edges, which comprises a male screw rotor and a female screw rotor, wherein the profiles of male rotor teeth and female rotor teeth are meshed with each other and have the same outer diameter; the profile of tooth profile molded lines of the female rotor tooth includes in proper order: a section of negative I circular arc, a section of negative II circular arc, a section of negative I straight line, a section of negative III circular arc, a section of negative circular arc envelope curve, a section of negative IV circular arc, a section of negative elliptical arc, a section of negative II straight line and a section of negative V circular arc; the profile of tooth molded lines of the male rotor tooth includes in proper order: a section of positive I circular arc, a section of positive I circular arc envelope line, a section of positive I linear envelope line, a section of positive II circular arc, a section of positive III circular arc, a section of positive elliptic arc envelope line, a section of positive II linear envelope line and a section of positive III circular arc envelope line. The utility model discloses a profile of tooth molded lines is smooth transition all, and easily processing realizes higher profile precision, has improved screw compressor's mechanical efficiency, has reduced the noise and the vibration of host computer.

Description

Equal-outer-diameter bilateral asymmetric screw molded line

Technical Field

The utility model belongs to the technical field of compressors, and particularly relates to a constant-outer-diameter bilateral asymmetric screw molded line.

Background

In the conventional compressor screw molded lines, intersection points exist among the intersected molded line segments, the conjugate curve of the conventional compressor screw molded lines is a point cycloid, the molded lines can be formed only by milling, the tool investment is large, the machining efficiency is low, the precision is not high, and the rotor abrasion is easily caused by point contact, so that the noise and the vibration are caused.

In addition, according to the conventional screw profile, the outer diameter of a female rotor is generally smaller than that of a male rotor, tooth grooves of the female rotor are more than those of the male rotor, so that the tooth profile strength of the female rotor is low, the integral rigidity of the female rotor is also low, the deflection is large, and the bottom diameter of the female rotor is smaller than that of the male rotor, so that the corresponding shaft diameter of a shaft extension end is also small, and the specifications of parts such as a bearing, a shaft seal, a check ring, a nut, a gear and the like on an extension shaft are more and cannot be unified.

The molded lines published at present mainly adopt unilateral molded lines in the early stage, and also have bilateral arc molded lines in recent years, the bilateral arc molded lines are mostly bilateral symmetrical molded lines, a leakage triangle formed by the unilateral molded lines and the bilateral symmetrical molded lines is larger, the volumetric efficiency of the host is low, and particularly when the host is applied to a dry screw or a water spray screw, the host has low efficiency and high energy consumption.

The screw compressor for the process flow on the market mainly adopts the SRM-C type wire which is already published by SRM company.

SUMMERY OF THE UTILITY MODEL

Aiming at the technical problem, the utility model provides a screw molded line with equal outer diameter and double asymmetric edges. The specific technical scheme is as follows:

the equal-outer-diameter bilateral asymmetric screw profile comprises a male screw rotor and a female screw rotor, wherein the end section of the male screw rotor comprises a male base circle, a male pitch circle and a male excircle, and male rotor teeth are arranged between the male base circle and the male excircle; the end section of the female screw rotor comprises a female bottom circle, a female pitch circle and a female excircle, and female rotor teeth are arranged between the female bottom circle and the female excircle;

the molded lines of the male rotor teeth and the female rotor teeth are meshed with each other and have the same outer diameter;

the tooth profile line of the female rotor tooth sequentially comprises the following line segments: a section of negative I circular arc, a section of negative II circular arc, a section of negative I straight line, a section of negative III circular arc, a section of negative circular arc envelope curve, a section of negative IV circular arc, a section of negative elliptical arc, a section of negative II straight line and a section of negative V circular arc;

the tooth profile line of the male rotor tooth sequentially comprises the following profile line sections: the section of the arc envelope line of the arc I of the sun, the section of the arc envelope line of the arc II of the sun, the section of the arc III of the sun, the section of the arc envelope line of the ellipse of the arc I of the sun, the section of the linear envelope line of the arc II of the sun and the section of the arc envelope line of the arc III of the sun.

Furthermore, the tooth shapes of the male rotor teeth and the female rotor teeth are both 6/4 teeth.

The line segments of all types are tangent at the intersection point and are in smooth transition.

The diameters of the external circle and the internal circle are the same.

The utility model has the following technical effects:

the tooth-shaped molded lines of the utility model are in smooth transition, not only can be milled and processed, but also are easy to grind and process, thereby realizing higher molded surface precision, improving the mechanical efficiency of the screw compressor, reducing the noise and vibration of a main machine and improving the stability and reliability of products;

the tooth-shaped male and female rotors of the utility model have the same outer diameter, the linear speed of the tooth tops of the rotors is closer, the sealing property and the strength of the female rotors are improved, the corresponding shaft diameters of the shaft extension ends can be the same due to the same outer diameter of the rotors, and the universality of parts on the extension shafts of the male and female rotors can be realized more easily;

the tooth-shaped molded line of the utility model is a bilaterally asymmetric molded line, which can effectively reduce the leakage triangle, improve the volumetric efficiency of the host and realize higher energy efficiency;

the utility model discloses a profile of tooth molded lines both can be used to the helical-lobe compressor for the process flow, also can be used to general air helical-lobe compressor.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic view of the tooth profile line structure of the present invention.

Detailed Description

The technical scheme of the utility model is explained by combining the attached drawings.

As shown in fig. 1 and fig. 2, taking the outer diameters of the male and female rotors as 255mm as an example, the equal-outer-diameter bilateral asymmetric screw profiles include a male screw rotor 1 and a female screw rotor 2, the male screw rotor 1 of the present embodiment is a four-head screw, and the female screw rotor 2 of the present embodiment is a six-head screw;

the end section of the male screw rotor 1 comprises a male base circle 11 with the diameter of 145mm, a male pitch circle 12 with the diameter of 160mm and a male excircle 13 with the diameter of 255mm, and a male rotor tooth 14 is arranged between the male base circle 11 and the male excircle 13; the end section of the female screw rotor 2 comprises a female bottom circle 21 with the diameter of 145mm, a female pitch circle 22 with the diameter of 240mm and a female outer circle 23 with the diameter of 255mm, and female rotor teeth 24 are arranged between the female bottom circle 21 and the female outer circle 23; the diameters of the male excircle 13 and the female excircle 23 are the same and are 255 mm.

The molded lines of the male rotor teeth 14 and the female rotor teeth 24 are mutually meshed, and the outer diameters of the molded lines are the same and are 255 mm;

the profile of the female rotor teeth 24 comprises the following profile segments in order: a section of I-shaped negative arc a2-b2 concentric with the pitch circle of the negative rotor and with the radius of 127.5mm, a section of II-shaped negative arc b2-c2 with the radius of 7.5mm and the center of the pitch circle o1, a section of I-shaped negative straight line c2-d2 tangent to the b2c2 arc and the d2e2 arc, a section of III-shaped negative arc d2-e2 with the center of the pitch circle o2 and the radius of 35mm, and a section of I-shaped negative arc envelope curve e2-f2 formed by the section of E1-f1 tooth profile of the positive rotor, a section of an anionic IV arc f2-g2 with the radius of 47.5mm by taking the point P of the external tangent of the two pitch circles as the center, a section of an anionic IV arc g2-h2 with the point g2 as the point with the maximum curvature radius of 83mm and the minimum curvature radius of 35mm, a section of an anionic II straight line h2-i2 tangent to the g2h2 elliptical arc and the i2j2 arc, and a section of an anionic V arc i2-j2 with the o6 on the pitch circle as the center and the radius of 7.5 mm;

the profile of the male rotor teeth 14 comprises the following profile segments in sequence: a section of male I circular arc a1-b1 with the concentric radius of 72.5mm with a male rotor pitch circle, a section of male I circular arc envelope b1-c1 formed by a female rotor tooth form b2-c2 circular arc section, a section of male I linear envelope c1-d1 formed by a female rotor tooth form c2-d2 straight line section, a section of male II circular arc envelope d1-e1 formed by a female rotor tooth form d2-e2 circular arc section, and a section taking o2 as the center, a positive II arc e1-f1 with the radius of 12mm, a section of which takes the point P of the external tangent point of the two-section circle as the center, the rotor tooth profile comprises a male III arc f1-g1 with the radius of 47.5mmr, a male elliptical arc envelope g1-h1 formed by female rotor tooth profile g2-h2 sections, a male II straight envelope h1-i1 formed by female rotor tooth profile h2-i2 straight line sections, and a male III arc envelope i1-j1 formed by female rotor tooth profile i2-j2 arc sections.

Furthermore, the tooth shapes of the male rotor teeth 14 and the female rotor teeth 24 are 6/4 teeth.

The profile lines of each screw are the same and are uniformly distributed on the circumference; the six-head screw and the four-head screw are arranged in parallel and meshed with each other, and the center distance between the male rotor and the female rotor is 200 mm. The advantages are good engagement performance, good sealing performance, easy to realize the latest grinding process, large area utilization coefficient, high volumetric efficiency, good specific flow and specific power of the whole machine, and solving the problem of easy abrasion of the rotor caused by point contact.

Claims

1. The uniform-outer-diameter bilateral asymmetric screw profile is characterized by comprising a male screw rotor (1) and a female screw rotor (2), wherein the end section of the male screw rotor (1) comprises a male base circle (11), a male pitch circle (12) and a male excircle (13), and male rotor teeth (14) are arranged between the male base circle (11) and the male excircle (13); the end section of the female screw rotor (2) comprises a female base circle (21), a female pitch circle (22) and a female excircle (23), and female rotor teeth (24) are arranged between the female base circle (21) and the female excircle (23);

the molded lines of the male rotor teeth (14) and the female rotor teeth (24) are mutually meshed and have the same outer diameter;

the tooth profile of the female rotor teeth (24) comprises the following profile segments in sequence: a section of an anionic I circular arc (a2-b2), a section of an anionic II circular arc (b2-c2), a section of an anionic I straight line (c2-d2), a section of an anionic III circular arc (d2-e2), a section of an anionic circular arc envelope (e2-f2), a section of an anionic IV circular arc (f2-g2), a section of an anionic elliptical arc (g2-h2), a section of an anionic II straight line (h2-i2) and a section of an anionic V circular arc (i2-j 2);

the tooth profile line of the male rotor tooth (14) sequentially comprises the following line segments: the solar cell comprises a section of a positive I circular arc (a1-b1), a section of a positive I circular arc envelope line (b1-c1), a section of a positive I linear envelope line (c1-d1), a section of a positive II circular arc envelope line (d1-e1), a section of a positive II circular arc (e1-f1), a section of a positive III circular arc (f1-g1), a section of a positive elliptical arc envelope line (g1-h1), a section of a positive II linear envelope line (h1-i1) and a section of a positive III circular arc envelope line (i1-j 1).

2. The constant-outer-diameter bilateral asymmetric screw profile of claim 1, wherein: the tooth shapes of the male rotor teeth (14) and the female rotor teeth (24) are 6/4 teeth.

3. The constant-outer-diameter bilateral asymmetric screw profile of claim 1, wherein: the line segments of all types are tangent at the intersection point and are in smooth transition.

4. The constant-outer-diameter bilateral asymmetric screw profile of claim 1, wherein: the diameters of the external male circle (13) and the external female circle (23) are the same.