Balanced single-claw rotor structure and molded line design method thereof

Abstract

The invention discloses a balanced single-claw rotor structure and a molded line design method thereof. The rotor structure comprises a rotor molded line composed of a point meshing cycloid segment, a tooth crest arc segment, a first transition molded line segment, a first middle arc segment, a second transition molded line segment, a second middle arc segment, a self-meshing molded line segment, a third middle arc segment, a third transition molded line segment, a fourth middle arc segment, a fourth transition molded line segment and a tooth root arc segment which are connected in sequence. In the meshing process, the point meshing cycloid section completes self-meshing, the tooth crest arc section is meshed with the tooth root arc section, the first transition type line section is meshed with the fourth transition type line section, the first middle arc section is meshed with the fourth middle arc section, the second transition type line section is meshed with the third transition type line section, and the second middle arc section is meshed with the third middle arc section. The self-meshing type line segment completes self-meshing; and the surface center of the single-tooth claw type rotor structure is close to the rotating axis by adjusting each section of the rotor molded line. According to the invention, defects caused by forming a large dynamic balance hole can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of rotor structure design, and in particular to a balanced single-claw rotor structure and a profile design method thereof. Background Art

[0002] The claw rotor structure has the advantages of high efficiency and low processing cost, and is widely used in oil-free compressors or vacuum pumps. Its core design element is the rotor profile, and the design of the profile will directly determine the thermal performance of the entire machine.

[0003] The traditional single-tooth claw rotor structure has inevitable dynamic balance problems because the center of the profile surface cannot coincide with the axis center. The traditional solution is to open dynamic balance holes on both sides of the claw rotor structure to perform weight-removing dynamic balance, which inevitably creates a closed volume cavity during the gas compression process. The existence of this volume cavity aggravates gas leakage and reduces the effective suction volume. At the same time, it makes it easy for dust and condensed solids to deposit in the dynamic balance hole, affecting operational reliability. Summary of the Invention

[0004] The purpose of the present invention is to address the problems in the above-mentioned prior art and provide a balanced single-claw rotor structure and its profile design method to avoid the defects caused by the opening of large dynamic balancing holes and improve the gas transmission efficiency and operational reliability of the mechanism.

[0005] In order to achieve the above object, the present invention has the following technical solutions:

[0006] In the first aspect, a balanced single-claw rotor structure is proposed, comprising a rotor profile consisting of a point-meshing cycloid segment, a tooth top arc segment, a first transition line segment, a first intermediate arc segment, a second transition line segment, a second intermediate arc segment, a self-meshing line segment, a third intermediate arc segment, a third transition line segment, a fourth intermediate arc segment, a fourth transition line segment and a tooth root arc segment connected in sequence; during the meshing process of the balanced single-claw rotor structure, the point-meshing cycloid segment completes self-meshing, the tooth top arc segment and the tooth root arc segment mesh with each other, the first transition line segment and the fourth transition line segment mesh with each other, the first intermediate arc segment and the fourth intermediate arc segment mesh with each other, the second transition line segment and the third transition line segment mesh with each other, the second intermediate arc segment and the third intermediate arc segment mesh with each other, and the self-meshing line segment completes self-meshing; by adjusting the segments of the rotor profile, the surface center of the single-claw rotor structure is close to the center of the rotation axis.

[0007] As a preferred solution, the radius of the tooth top arc segment is R2, the radius of the tooth root arc segment is R1, the center angles corresponding to the tooth top arc segment and the tooth root arc segment are the same, and the sum of the radius R1 and the radius R2 A is the center distance between the two profiles; the radius of the first intermediate arc segment and the fourth intermediate arc segment is A / 2, and the center angles of the first intermediate arc segment and the fourth intermediate arc segment are equal; the sum of the radii of the second intermediate arc segment and the third intermediate arc segment is the center distance between the two profiles, and the center angles of the second intermediate arc segment and the third intermediate arc segment are equal.

[0008] As a preferred solution, during the meshing process of the balanced single-claw rotor structure, coordinate systems S1 (O1x1y1) and S2 (O2x2y2) are established with the centers of the two balanced single-claw rotor structures, and the coordinate position vector of the first transition line segment is solved according to the following expression:

[0009]

[0010] Where r III (θ) represents the coordinate position vector of the first transition line segment in the coordinate system S1(O1x1y1), the variable θ is a parameter variable, the subscript III represents the design parameters of the first transition line segment, and the superscript 1 represents the coordinate system S1(O1x1y1);

[0011] The first transition line segment and the fourth transition line segment meet the meshing relationship. The fourth transition line segment is solved in S2(O2x2y2) according to the following expression:

[0012]

[0013] Where, Represents the coordinate position vector of the fourth transition line segment in the coordinate system S2(O2x2y2), variable θ is a parameter, variable is the intermediate angle variable parameter, A is the center distance, and the superscript 2 represents the coordinate system S2(O2x2y2).

[0014] As a preferred solution, the intermediate angle variable parameter The relationship with the parameter θ is solved according to the following expression:

[0015] τ III (θ,φ)·[x 2 XI (θ,φ)-R p y 2 XI (θ,φ)] T =0

[0016] Where R p is the pitch circle radius, which is half of the center distance A. is the tangent vector of the first transition segment;

[0017] Tangent vector of the first transition segment Solve according to the following expression:

[0018]

[0019] As a preferred solution, the meshing relationship between the second transition type line segment and the third transition type line segment is the same as the meshing relationship between the first transition type line segment and the fourth transition type line segment. Therefore, the second transition type line segment and the third transition type line segment are solved in the same way.

[0020] As a preferred solution, the curve group types used by the second transition line segment and the third transition line segment and the first transition line segment and the fourth transition line segment include any one of the epicycloid and introcycloid segments, involutes, circular arcs and circular arc envelope segments, and straight lines and straight line envelope segments.

[0021] As a preferred solution, the curve segment type adopted by the self-engaging line segment includes any one of an involute and a cycloid-modified involute.

[0022] In a second aspect, a fluid machine is proposed, which has the balanced single-claw rotor structure.

[0023] On the third aspect, a design method for the balanced single-claw rotor structure is proposed, including: adjusting the design parameters of the point-meshing cycloid segment, the tooth top arc segment, the first transition line segment, the first intermediate arc segment, the second transition line segment, the second intermediate arc segment, the self-meshing line segment, the third intermediate arc segment, the third transition line segment, the fourth intermediate arc segment, the fourth transition line segment and the tooth root arc segment in the rotor profile, so that the center point of the balanced single-claw rotor structure is close to the center point of the rotation axis, and opening a dynamic balancing hole according to the dynamic balancing requirements based on the adjustment of the center point of the balanced single-claw rotor structure.

[0024] As a preferred solution, the shape of the rotor profile is adjusted by adjusting the design parameters of the point-meshing cycloid segment, the tooth top arc segment, the first transition line segment, the first intermediate arc segment, the second transition line segment, the second intermediate arc segment, the self-meshing line segment, the third intermediate arc segment, the third transition line segment, the fourth intermediate arc segment, the fourth transition line segment and the tooth root arc segment in the rotor profile, so as to achieve the adjustment of the suction volume, processing curvature or internal volume ratio.

[0025] Compared with the prior art, the present invention has at least the following beneficial effects:

[0026] The traditional single-tooth claw rotor structure has an inevitable dynamic balance problem because the center of the profile cannot coincide with the axis center. The balanced single-tooth claw rotor structure profile designed by the present invention includes a point-meshing cycloid segment, a tooth top arc segment, a first transition line segment, a first intermediate arc segment, a second transition line segment, a second intermediate arc segment, a self-meshing line segment, a third intermediate arc segment, a third transition line segment, a fourth intermediate arc segment, a fourth transition line segment and a tooth root arc segment connected in sequence. During the meshing process, the point-meshing cycloid segment completes self-meshing, the tooth top arc segment and the tooth root arc segment mesh with each other, the first transition line segment and the fourth transition line segment mesh with each other, and the first intermediate arc segment and The fourth intermediate arc segment meshes with each other, the second transition line segment and the third transition line segment mesh with each other, the second intermediate arc segment and the third intermediate arc segment mesh with each other, and the self-meshing line segment completes self-meshing. Through the reasonable design and selection of the above line segment types and parameters, the line center of the single-tooth claw rotor structure can be effectively adjusted to achieve the ideal effect of coinciding the surface center of the single-tooth claw rotor structure with the rotation axis as much as possible, thereby effectively adjusting the dynamic and static balance performance of the claw rotor structure, reducing the need for opening dynamic balancing holes, and solving the problem that the traditional single-tooth claw rotor structure needs to open larger dynamic balancing holes, which is easy to cause vibration, leakage and powder accumulation, thereby improving the gas transmission efficiency and operation reliability of the mechanism.

[0027] Furthermore, the second transition type line segment and the third transition type line segment as well as the first transition type line segment and the fourth transition type line segment of the present invention can adopt typical curve group types, including inner and outer cycloid segments, involutes, circular arcs and circular arc envelope segments, straight lines and straight line envelope segments, etc. The self-meshing line segments can adopt typical curve segment types, including involutes, cycloid-modified involutes, etc. The lines that meet the meshing relationship and the solution relationship can reasonably complete the meshing motion. At the same time, by adjusting the design parameters, the rotor profile shape can be flexibly adjusted, and the parameters such as the suction volume, processing curvature, and internal volume ratio can be flexibly adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 A schematic diagram of the profile of a balanced single-claw rotor structure according to an embodiment of the present invention;

[0030] Figure 2 Schematic diagram of the profile meshing process of a balanced single-claw rotor structure according to an embodiment of the present invention;

[0031] Figure 3Schematic diagram of a typical case of generating the profile of a balanced single-claw rotor structure according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, ordinary technicians in this field can also derive other embodiments without making any creative work.

[0033] See also Figure 1 , an embodiment of the present invention proposes a balanced single-tooth claw rotor structure. Through reasonable profile design, the center of the surface of the single-tooth claw rotor structure coincides with the axis center, thereby achieving theoretical dynamic balance and solving the defect that the claw rotor structure needs to have a large dynamic balancing hole. Specifically, the balanced single-tooth claw rotor structure of the embodiment of the present invention includes a rotor profile composed of a point-meshing cycloid segment I, a tooth top arc segment II, a first transition line segment III, a first intermediate arc segment IV, a second transition line segment V, a second intermediate arc segment VI, a self-meshing line segment VII, a third intermediate arc segment VIII, a third transition line segment IX, a fourth intermediate arc segment X, a fourth transition line segment XI and a tooth root arc segment XII connected in sequence. Please refer to Figure 2 During the meshing process of the balanced single-claw rotor structure, the point-meshing cycloid segment I completes self-meshing, the tooth top arc segment II and the tooth root arc segment XII mesh with each other, the first transition segment III and the fourth transition segment XI mesh with each other, the first intermediate arc segment IV and the fourth intermediate arc segment X mesh with each other, the second transition segment V and the third transition segment IX mesh with each other, the second intermediate arc segment VI and the third intermediate arc segment VIII mesh with each other, and the self-meshing segment VII completes self-meshing. Through the reasonable design and selection of the above profile segment types and parameters, the claw rotor profile center is effectively adjusted. By adjusting the various segments of the rotor profile, the single-claw rotor structure surface center is brought close to the rotation axis center, thereby effectively adjusting the dynamic and static balance performance of the single-claw rotor structure, solving the defect that the single-claw rotor structure requires a large dynamic balancing hole, and improving the gas transmission efficiency and operational reliability of the mechanism.

[0034] Furthermore, the profile of the balanced single-claw rotor structure of the embodiment of the present invention is solved by the following method:

[0035] Assume that the radius of the tooth top arc segment II is R2, the radius of the tooth root arc segment XII is R1, the center angles corresponding to the tooth top arc segment II and the tooth root arc segment XII are the same, and the sum A of the radius R1 and the radius R2 is the center distance between the two profiles; the radius of the first intermediate arc segment IV and the fourth intermediate arc segment X is A / 2, and the center angles of the first intermediate arc segment IV and the fourth intermediate arc segment X are equal; the sum of the radii of the second intermediate arc segment VI and the third intermediate arc segment VIII is the center distance between the two profiles, and the center angles of the second intermediate arc segment VI and the third intermediate arc segment VIII are equal.

[0036] The coordinate systems S1 (O1x1y1) and S2 (O2x2y2) are established with the centers of the two balanced single-claw rotor structures. The coordinate position vector of the first transition segment III is solved according to the following expression:

[0037]

[0038] Where r III (θ) represents the coordinate position vector of the first transition line segment III in the coordinate system S1(O1x1y1), the variable θ is a parameter variable, the subscript III represents the design parameter of the first transition line segment III, and the superscript 1 represents the coordinate system S1(O1x1y1);

[0039] The first transition line segment III and the fourth transition line segment XI satisfy the meshing relationship. The fourth transition line segment XI is solved in S2(O2x2y2) according to the following expression:

[0040]

[0041] Where, Represents the coordinate position vector of the fourth transition line segment XI in the coordinate system S2(O2x2y2), variable θ is a parameter, variable is the intermediate angle variable parameter, A is the center distance, and the superscript 2 represents the coordinate system S2(O2x2y2).

[0042] Furthermore, the intermediate angle variable parameter The relationship with the parameter θ is solved according to the following expression:

[0043] τ III (θ,φ)·[x 2 XI (θ,φ)-R p y 2 XI (θ,φ)] T =0

[0044] Where R p is the pitch circle radius, which is half of the center distance A. is the tangent vector of the first transition segment III;

[0045] Tangent vector of the first transition segment III Solve according to the following expression:

[0046]

[0047] Any set of curves that satisfy the above meshing relationship can be used as the first transition line segment III and the fourth transition line segment XI. Furthermore, the meshing relationship between the second transition line segment V and the third transition line segment IX in this embodiment of the present invention is the same as the meshing relationship between the first transition line segment III and the fourth transition line segment XI. Therefore, the second transition line segment V and the third transition line segment IX are also solved in the same manner.

[0048] In a possible embodiment, the curve group type used by the second transition type line segment V and the third transition type line segment IX and the first transition type line segment III and the fourth transition type line segment XI in the embodiment of the present invention can be any one of the epicycloid and introcycloid segments, involutes, circular arcs and circular arc envelope segments, and straight lines and straight line envelope segments.

[0049] In a possible implementation manner, the curve segment type adopted by the self-meshing type line segment VII in the embodiment of the present invention can be any one of an involute and a cycloid-modified involute.

[0050] Another embodiment of the present invention provides a fluid machine having the balanced single-claw rotor structure described in the embodiment of the present invention. The fluid machine described in the embodiment of the present invention includes an oil-free compressor or a vacuum pump, both of which are key devices in the field of fluid machinery for gas transportation and pressure regulation.

[0051] The embodiment of the present invention further provides a design method for the balanced single-claw rotor structure, comprising:

[0052] By adjusting the design parameters of the point-meshing cycloid segment I, the tooth top arc segment II, the first transition segment III, the first intermediate arc segment IV, the second transition segment V, the second intermediate arc segment VI, the self-meshing segment VII, the third intermediate arc segment VIII, the third transition segment IX, the fourth intermediate arc segment X, the fourth transition segment XI and the tooth root arc segment XII in the rotor profile, the surface center of the balanced single-claw rotor structure is made close to the rotation axis center, and dynamic balancing holes are opened according to dynamic balancing requirements on the basis of the adjusted surface center of the balanced single-claw rotor structure, thereby reducing the demand for opening dynamic balancing holes.

[0053] In a possible embodiment, the embodiment of the present invention can also achieve flexible adjustment of the rotor profile shape and flexible adjustment of parameters such as suction volume, processing curvature or internal volume ratio by adjusting the design parameters of the point-meshing cycloid segment I, the tooth top arc segment II, the first transition line segment III, the first intermediate arc segment IV, the second transition line segment V, the second intermediate arc segment VI, the self-meshing line segment VII, the third intermediate arc segment VIII, the third transition line segment IX, the fourth intermediate arc segment X, the fourth transition line segment XI and the tooth root arc segment XII in the rotor profile.

[0054] See also Figure 3 In a typical example of generating the profile of a balanced single-claw rotor structure according to an embodiment of the present invention, the radius of the addendum arc segment CD is R2, and the radius of the root arc segment AP is R1. The center angles corresponding to the addendum arc segment CD and the root arc segment AP are the same. The radius of the intermediate arc segment EF and the intermediate arc segment ON is A / 2, and the center angles of the two arc segments are equal. The sum of the radii of the intermediate arc segments GI and LM is the center distance between the two profiles, and the center angles of the two arc segments are equal. Curve segment BC is a hypocycloid segment, curve segment AB is an epicycloid segment meshing with it, curve segment PZ is a circular arc envelope, curve segment ZY is a straight line segment, curve segment YO is a circular arc segment, curve segment ED meshes with curve segment PO, curve segment MN is a quadratic spline curve in polar coordinates, curve segment GF is a quadratic spline curve envelope curve segment meshing with curve segment GF, curve segment LK is a circular arc segment, curve segment GK is an involute segment, and curve segment HG is a circular arc envelope. The profile formed by the above curve segments can reasonably complete the meshing motion, and the rotor profile shape can be flexibly adjusted by adjusting the design parameters, and the parameters such as the suction volume, processing curvature, and internal volume ratio can be flexibly adjusted. The present invention effectively adjusts the claw rotor profile center point through the reasonable design and selection of the above profile segment types and parameters, and further effectively adjusts the dynamic and static balance performance of the single-tooth claw rotor structure, solving the defect that the single-tooth claw rotor structure needs to have a large dynamic balance hole, thereby improving the gas transmission efficiency and operational reliability of the mechanism.

[0055] It will be apparent to those skilled in the art that the present invention is not limited to the details described in the above embodiments and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description. It is intended that all variations that come within the meaning and range of equivalents of the claims be encompassed within the present invention, and any reference signs in the claims should not be construed as limiting the scope of protection.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A balanced single claw rotor structure, characterized in that: The invention comprises a rotor profile consisting of a point meshing cycloid segment (I), a tooth top arc segment (II), a first transition line segment (III), a first intermediate arc segment (IV), a second transition line segment (V), a second intermediate arc segment (VI), a self-meshing line segment (VII), a third intermediate arc segment (VIII), a third transition line segment (IX), a fourth intermediate arc segment (X), a fourth transition line segment (XI) and a tooth root arc segment (XII) connected in sequence; in the meshing process of the balanced single-tooth claw rotor structure, the point meshing cycloid segment (I) completes the self-meshing The tooth top arc segment (II) and the tooth root arc segment (XII) are meshed with each other, the first transition line segment (III) and the fourth transition line segment (XI) are meshed with each other, the first intermediate arc segment (IV) and the fourth intermediate arc segment (X) are meshed with each other, the second transition line segment (V) and the third transition line segment (IX) are meshed with each other, the second intermediate arc segment (VI) and the third intermediate arc segment (VIII) are meshed with each other, and the self-meshing line segment (VII) completes self-meshing; by adjusting the various segments of the rotor profile, the surface center of the single-claw rotor structure is brought close to the rotation axis center.

2. The balanced single-claw rotor structure according to claim 1, characterized in that: The radius of the tooth top arc segment (II) is R2, the radius of the tooth root arc segment (XII) is R1, the center angles corresponding to the tooth top arc segment (II) and the tooth root arc segment (XII) are the same, and the sum A of the radius R1 and the radius R2 is the center distance between the two profiles; the radius of the first intermediate arc segment (IV) and the fourth intermediate arc segment (X) is A / 2, and the center angles of the first intermediate arc segment (IV) and the fourth intermediate arc segment (X) are equal; the sum of the radii of the second intermediate arc segment (VI) and the third intermediate arc segment (VIII) is the center distance between the two profiles, and the center angles of the second intermediate arc segment (VI) and the third intermediate arc segment (VIII) are equal.

3. The balanced single-claw rotor structure according to claim 1, characterized in that: During the meshing process of the balanced single-claw rotor structure, coordinate systems S1 (O1x1y1) and S2 (O2x2y2) are established with the centers of the two balanced single-claw rotor structures. The coordinate position vector of the first transition line segment (III) is solved according to the following expression: Where r III (θ) represents the coordinate position vector of the first transition line segment (III) in the coordinate system S1(O1x1y1), the variable θ is a parameter variable, the subscript III represents the design parameter of the first transition line segment (III), and the superscript 1 represents the coordinate system S1(O1x1y1); The first transition line segment (III) and the fourth transition line segment (XI) satisfy the meshing relationship. The fourth transition line segment (XI) is solved in S2(O2x2y2) according to the following expression: Where, Represents the coordinate position vector of the fourth transition line segment (XI) in the coordinate system S2 (O2x2y2), variable θ is a parameter, variable is the intermediate angle variable parameter, A is the center distance, and the superscript 2 represents the coordinate system S2(O2x2y2).

4. The balanced single-claw rotor structure according to claim 3, characterized in that: The intermediate angle variable parameter The relationship with the parameter θ is solved according to the following expression: t III (θ,φ)·[x 2 XI (θ,φ)-R p y 2 XI (i,f)] T =0 Where R p is the pitch circle radius, which is half of the center distance A. is the tangent vector of the first transition segment (III); Tangent vector of the first transition segment (III) Solve according to the following expression:

5. The balanced single-claw rotor structure according to claim 4, characterized in that: The meshing relationship between the second transition type line segment (V) and the third transition type line segment (IX) is the same as the meshing relationship between the first transition type line segment (III) and the fourth transition type line segment (XI), and the second transition type line segment (V) and the third transition type line segment (IX) are solved in the same way.

6. The balanced single-claw rotor structure according to claim 5, characterized in that: The curve group types used by the second transition type line segment (V) and the third transition type line segment (IX) as well as the first transition type line segment (III) and the fourth transition type line segment (XI) include any one of the epicycloid and introcycloid segments, involutes, circular arcs and circular arc envelope segments, and straight lines and straight line envelope segments.

7. The balanced single-claw rotor structure according to claim 5, characterized in that: The type of curve segment used by the self-engaging line segment (VII) includes any one of an involute and a cycloid modified involute.

8. A fluid machinery, characterized in that: It has a balanced single-tooth claw rotor structure as claimed in any one of claims 1 to 7.

9. A design method for a balanced single-claw rotor structure according to any one of claims 1 to 7, characterized in that: include: By adjusting the design parameters of the point-meshing cycloid segment (I), the tooth top arc segment (II), the first transition segment (III), the first intermediate arc segment (IV), the second transition segment (V), the second intermediate arc segment (VI), the self-meshing segment (VII), the third intermediate arc segment (VIII), the third transition segment (IX), the fourth intermediate arc segment (X), the fourth transition segment (XI) and the tooth root arc segment (XII) in the rotor profile, the surface center of the balanced single-tooth claw rotor structure is made close to the rotation axis center, and a dynamic balancing hole is opened according to the dynamic balancing requirements based on the adjusted surface center of the balanced single-tooth claw rotor structure.

10. The design method according to claim 9, characterized in that: By adjusting the design parameters of the point-meshing cycloid segment (I), the tooth top arc segment (II), the first transition line segment (III), the first intermediate arc segment (IV), the second transition line segment (V), the second intermediate arc segment (VI), the self-meshing line segment (VII), the third intermediate arc segment (VIII), the third transition line segment (IX), the fourth intermediate arc segment (X), the fourth transition line segment (XI) and the tooth root arc segment (XII) in the rotor profile, the shape of the rotor profile can be adjusted, as well as the suction volume, processing curvature or internal volume ratio.

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