CN111396311A - A hollow screw rotor and its processing method - Google Patents

Abstract

The invention relates to a hollow screw rotor and a processing method thereof. The hollow screw rotor comprises: a rotor body, the rotor body is a hollow shell structure with open ends; the outer wall is provided with a rolled first spiral groove; two sets of sealing sections, The openings at both ends correspond to two groups of sealing sections respectively, and the outer wall of each group of sealing sections is rolled with a second spiral groove with the same parameters as the first spiral groove, which forms an integral spiral groove structure after being fixed; and the rotation of the two groups of sealing sections The center is coaxial with the rotation center of the rotor body; the first connecting shaft is fixed on the outer side of one set of sealing sections; and the second connecting shaft is fixed on the outer side of the other group of sealing sections. The invention discloses and provides a hollow screw rotor, which greatly reduces the mass and moment of inertia of the screw rotor compared with the one-piece solid structure, and simultaneously reduces the material usage of the traditional one-piece screw rotor; the processing method reduces the processing time and processing cost, and The processing efficiency of the screw rotor is improved.

Description

A hollow screw rotor and its processing method

technical field

The invention relates to the technical field of screw rotors, and more particularly to a hollow screw rotor and a processing method thereof.

Background technique

The screw air compressor has the advantages of simple structure, reliable operation, low noise and convenient control, and has been widely used in aerodynamics, refrigeration and air conditioning and other industries. The twin-screw pump and the three-screw pump in the screw pump are also the focus of the development of the hydraulic pump industry in recent years because of the advantages of stable operation, large flow, high pressure and simple structure. However, as the core component of screw air compressors and screw pumps, screw rotors have complex structures, high processing accuracy requirements, and difficult processing, which are the key points restricting screw air compressors and screw pumps to improve processing efficiency and reduce production costs.

The traditional screw rotor is generally a solid structure. The bar is used as the blank to form a rough structure of the spiral groove by milling through a special machine tool, and then the final working surface of the screw rotor is formed by grinding with a special grinding machine for the screw rotor. Therefore, the screw rotor has a long processing cycle, cumbersome procedures, high precision requirements, complex structure of the required machine tool equipment, high manufacturing difficulty, and high initial investment cost. The solid structure of the screw rotor has a large mass, a large moment of inertia, a high driving power required, and a high processing and manufacturing cost, which restricts the application of products such as screw air compressors and screw pumps.

Therefore, in order to overcome the defects of large mass and large moment of inertia of the existing solid screw rotor, how to provide a hollow screw rotor structure to greatly reduce the mass of the rotor is an urgent problem to be solved by those skilled in the art.

SUMMARY OF THE INVENTION

The present invention aims to solve one of the above-mentioned technical problems in the prior art at least to a certain extent.

Therefore, an object of the present invention is to provide a hollow screw rotor, which reduces the mass of the screw rotor and reduces the moment of inertia.

The present invention provides a hollow screw rotor, comprising:

The rotor body is an empty shell structure with open ends; the outer wall has a rolled first spiral groove;

Two sets of sealing sections, the openings at both ends correspond to the two sets of sealing sections respectively, and a second spiral groove with the same parameters as the first thread groove is rolled on the outer wall of each group of sealing sections, and an integral spiral groove structure is formed after being fixed; The center of rotation of the group sealing section is coaxial with the center of rotation of the rotor body;

a first connecting shaft, the first connecting shaft is fixed on the outer side surface of a group of sealing segments;

and a second connecting shaft, and the second connecting shaft is fixed on the outer side surface of the other group of sealing sections.

It can be seen from the above technical solutions that, compared with the prior art, the present disclosure provides a hollow screw rotor, which includes a hollow rotor body, a sealing section, a first connecting shaft and a second connecting shaft that are fixedly connected, and are integrally formed. Compared with the solid structure, the mass and moment of inertia of the screw rotor are greatly reduced, and the material usage of the traditional one-piece screw rotor is also reduced.

Further, an outer tooth-shaped first helical groove is formed on the outer wall of the rotor body; an inner-tooth-shaped third helical groove corresponding to the first helical groove is formed on the inner wall.

Further, the inner wall and the outer wall of the rotor body have equal wall thicknesses.

Further, two ends of the hollow shell structure form planes, each group of sealing sections is a solid sheet-like structure, and both ends are planes.

Further, the first connecting shaft is a stepped three-section shaft or a two-section shaft; the second connecting shaft is a stepped two-section shaft or three-section shaft.

Another object of the present invention is to provide a processing method of the hollow screw rotor as above, comprising the following steps:

S1. Roll the profiles according to the external dimensions of the rotor body and the sealing section respectively; respectively process the first connecting shaft blank and the second connecting shaft blank according to the size requirements of the connecting shaft;

S2. According to the axial length of the screw rotor, cut the rotor body profile and the sealing section profile;

S3, fix the two groups of sealing sections cut out in S2 on both sides of a screw rotor section, so that the first helical groove and the second helical groove correspond to form the working surface to be processed;

S4, respectively fixing the first connecting shaft and the second connecting shaft on the outer surfaces of the two groups of sealing sections in S3 to form a semi-finished product of the hollow helical rotor;

S5, grinding the working surface of the semi-finished product in S4 to be processed to form the actual working surface of the screw rotor with accurate profile and high surface quality.

It can be seen from the above technical solutions that, compared with the prior art, the present disclosure provides a processing method for a hollow screw rotor, which divides the screw rotor into five sections, namely the hollow rotor body, two sets of sealing sections, and a first connecting shaft. And the second connecting shaft, the hollow rotor body and the two sets of sealing sections are rolled according to the size requirements, and the machining blank of the three-section shaft and the two-section shaft can be greatly reduced, thereby reducing the processing time and processing cost; The rough structure of the helical groove of the hollow screw rotor of the same specification is then ground to form the actual working surface of the screw rotor with accurate profile and high surface quality, so as to improve the processing efficiency of the screw rotor.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the provided drawings without creative work.

1 is a perspective view of a hollow screw rotor provided by the present invention;

2 is a front view of a hollow screw rotor provided by the present invention;

Fig. 3 is the A-A sectional view of Fig. 2;

4 is a perspective view of a rotor body of a hollow screw rotor provided by the present invention;

5 is a perspective view of a sealing section of a hollow screw rotor provided by the present invention;

In the figure: 1-rotor body, 1-1-outer end face profile, 1-2-inner end face profile, 2-sealing section, 2-1-sealing section profile, 3-first connecting shaft, 4-th Two connecting shafts.

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated device or Elements must have a particular orientation, be constructed and operate in a particular orientation and are therefore not to be construed as limitations of the invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of the two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may include the first and second features in direct contact, or may include the first and second features Not directly but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

The embodiment of the invention discloses various hollow screw rotors, which reduces the quality of the screw rotor and the moment of inertia.

Referring to the accompanying drawings 1-5, a hollow screw rotor provided by the present invention includes:

Rotor body 1, the rotor body 1 is an empty shell structure with open ends; the outer wall has a rolled first spiral groove;

Two sets of sealing sections 2, the openings at both ends correspond to the two sets of sealing sections 2 respectively, and the outer wall of each set of sealing sections 2 is rolled with a second spiral groove with the same parameters as the first thread groove, which is fixed to form an integral spiral groove structure ; and the center of rotation of the two sets of sealing sections 2 is coaxial with the center of rotation of the rotor body 1;

The first connecting shaft 3, the first connecting shaft 3 is fixed on the outer surface of a group of sealing sections 2;

and the second connecting shaft 4 , and the second connecting shaft 4 is fixed on the outer surface of the other group of sealing sections 2 .

The invention discloses and provides a hollow screw rotor, which comprises a hollow rotor body, a sealing section, a first connecting shaft and a second connecting shaft that are fixedly connected. Compared with the one-piece solid structure, the mass and moment of inertia of the screw rotor are greatly reduced , while reducing the use of traditional integrated screw rotor materials.

Wherein, the outer wall of the rotor body 1 is formed with a first helical groove in the form of external teeth; the inner wall is formed with a third helical groove in the form of internal teeth corresponding to the first helical groove.

Advantageously, the inner and outer walls of the rotor body 1 are formed with equal wall thicknesses.

More advantageously, both ends of the hollow shell structure form planes, each group of sealing sections 2 is a solid sheet-like structure, and both ends are planes.

In an embodiment of the present invention, the first connecting shaft 3 is a stepped shaft with three sections or two sections; the second connecting shaft 4 is a stepped shaft with two sections or three sections.

The present invention also provides a processing method of the above-mentioned hollow screw rotor, comprising the following steps:

S1. Roll the profiles according to the external dimensions of the rotor body and the sealing section respectively; respectively process the first connecting shaft blank and the second connecting shaft blank according to the size requirements of the connecting shaft;

S2. According to the axial length of the screw rotor, cut the rotor body profile and the sealing section profile;

S3, fix the two groups of sealing sections cut out in S2 on both sides of a screw rotor section, so that the first helical groove and the second helical groove correspond to form the working surface to be processed;

S4, respectively fixing the first connecting shaft and the second connecting shaft on the outer surfaces of the two groups of sealing sections in S3 to form a semi-finished product of the hollow helical rotor;

S5, grinding the working surface of the semi-finished product in S4 to be processed to form the actual working surface of the screw rotor with accurate profile and high surface quality.

The invention discloses and provides a processing method of a hollow screw rotor. The screw rotor is divided into five sections, namely a hollow rotor body, two sets of sealing sections, a first connecting shaft and a second connecting shaft, a hollow rotor body and two sets of sealing sections. By rolling the profiles according to the size requirements, the machining blank of the three-section shaft and the two-section shaft can be greatly reduced, thereby reducing the processing time and processing cost; the rough structure of the helical groove of the hollow screw rotor of the same specification is formed by rolling, and then grinding Shaping to form the actual working surface of the screw rotor with accurate profile lines (1-1, 1-2, 2-1) and high surface quality, improving the processing efficiency of the screw rotor.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

Although the embodiments of the present invention have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present invention. Embodiments are subject to variations, modifications, substitutions and variations.

Claims (6)

1. A hollow screw rotor, comprising:

the rotor comprises a rotor body (1), wherein the rotor body (1) is of a hollow shell structure with two open ends; the outer wall of the first spiral groove is provided with a first rolled spiral groove;

the two ends of the openings of the two groups of sealing sections (2) respectively correspond to the two groups of sealing sections (2), a second spiral groove with the same parameter as the first spiral groove is rolled on the outer wall of each group of sealing sections (2), and an integral spiral groove structure is formed after the second spiral groove is fixed; the rotation centers of the two groups of sealing sections (2) are coaxial with the rotation center of the rotor body (1);

the outer side surface of one group of the sealing sections (2) is fixed with the first connecting shaft (3);

and the outer side surface of the other group of the sealing sections (2) is fixed with the second connecting shaft (4).

2. A hollow screw rotor according to claim 1, characterized in that the rotor body (1) is formed with an outer toothed first helical groove on its outer wall; and an inner toothed third spiral groove corresponding to the first spiral groove is formed on the inner wall of the first spiral groove.

3. A hollow screw rotor according to claim 2, characterized in that the rotor body (1) has an inner wall and an outer wall with equal wall thickness.

4. A hollow screw rotor according to claim 1, characterized in that the two ends of the hollow shell structure form a plane, each set of the seal segments (2) is a solid sheet structure, and the two end faces are plane.

5. A hollow screw rotor according to claim 1, characterized in that the first connecting shaft (3) is a stepped three-section shaft or two-section shaft; the second connecting shaft (4) is a stepped two-section shaft or a stepped three-section shaft.

6. A method of manufacturing a hollow screw rotor according to any of claims 1 to 5, comprising the steps of:

s1, rolling the profiles according to the external dimension requirements of the rotor body and the seal section respectively; respectively processing a first connecting shaft blank and a second connecting shaft blank according to the size requirement of the connecting shaft;

s2, cutting the rotor body section and the sealing section according to the axial length of the screw rotor;

s3, fixing the two groups of sealing sections cut in the S2 on two side faces of a screw rotor section, and enabling the first spiral groove and the second spiral groove to form a working surface to be processed correspondingly;

s4, respectively and correspondingly fixing the first connecting shaft and the second connecting shaft on the outer side surfaces of the two groups of seal sections in the S3 to form a semi-finished product of the hollow spiral rotor;

and S5, grinding the work surface to be processed of the semi-finished product in the S4 to form the actual work surface of the screw rotor with accurate molded line and high surface quality.

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