CN115076103B - Roots rotor - Google Patents
Roots rotor Download PDFInfo
- Publication number
- CN115076103B CN115076103B CN202210729576.6A CN202210729576A CN115076103B CN 115076103 B CN115076103 B CN 115076103B CN 202210729576 A CN202210729576 A CN 202210729576A CN 115076103 B CN115076103 B CN 115076103B
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- Prior art keywords
- line
- eccentric
- roots
- rose
- symmetry
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/126—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/082—Details specially related to intermeshing engagement type pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2250/00—Geometry
- F04C2250/20—Geometry of the rotor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
Abstract
The invention relates to the technical field of Roots vacuum pumps,the technical scheme is that the molded line of the Roots rotor consists of eight sections of curves which are sequentially connected end to end, and an eccentric rose line A is sequentially arranged in a counterclockwise direction 1 A 2 So that the eccentric rose line A 1 A 2 And the symmetry line A 1 A 8 The smooth connection between the two parts solves the problem of sharp points, eliminates the problem of leakage triangle, can independently adjust the sizes of the addendum circle and the root circle, and adjusts the eccentric rose line A 1 A 2 The eccentric amount a and the area utilization coefficient c of the Roots pump are improved, so that the area utilization coefficient is improved compared with the traditional Roots rotor end face molded line, the volumetric efficiency of the Roots pump is improved, the structure is compact, the pumping speed of the Roots pump is greatly improved, and the volume of the Roots pump is reduced.
Description
Technical Field
The invention relates to the technical field of Roots vacuum pumps, in particular to a Roots rotor.
Background
The Roots pump is a positive displacement rotary pump, can obtain a dry and low-pollution high-vacuum environment, compresses clean gas, has quick start, low power consumption, low operation and maintenance cost, high pumping speed and high efficiency, and is widely applied to industries such as vacuum drying, film plating, foods, solar energy, medicines and the like, and in recent years, becomes a first choice pump in a vacuum system and some low-pressure air pressure systems;
the working principle of the pump is similar to that of a gear pump, two gears meshed with each other are used for respectively driving two rotors to mutually mesh to realize the air extraction function, the cores of the two rotors are molded lines, whether the design of the molded lines of the rotors is reasonable or not is directly related to various performance indexes of the vacuum pump, such as tightness, area utilization coefficient, theoretical pumping speed and the like, and meanwhile, the processing and manufacturing cost of the Roots rotor is determined;
the traditional rotor molded lines are mainly classified into the following three categories: involute, arc and cycloid, and the problems of low area utilization coefficient and poor sealing performance of the molded lines exist.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a Roots rotor which is used for improving the area utilization coefficient and the sealing performance.
In order to achieve the above purpose, the present invention provides the following technical solutions: the Roots rotor has its molded line comprising eight sections of curves connected end to end and with eccentric rose line A in counter clockwise direction 1 A 2 The eccentric rose line A 1 A 2 Is a conjugate envelope A of (2) 2 A 3 The conjugate envelope A 2 A 3 Symmetry line A taking vertical direction as symmetry axis 3 A 4 The eccentric rose line A 1 A 2 Symmetry line A taking vertical direction as symmetry axis 4 A 5 The symmetry line A 4 A 5 Symmetry line A taking horizontal direction as symmetry axis 5 A 6 The symmetry line A 3 A 4 Symmetry line A taking horizontal direction as symmetry axis 6 A 7 The conjugate envelope A 2 A 3 Symmetry line A taking horizontal direction as symmetry axis 7 A 8 The eccentric rose line A 1 A 2 Symmetry line A taking horizontal direction as symmetry axis 8 A 1 ；
The eccentric rose line A 1 A 2 Tangent to the tooth top circle with radius R to be A 1 Point of the eccentric rose line A 1 A 2 With the conjugate envelope A 2 A 3 Smooth connection is realized;
the conjugate envelope A 2 A 3 Tangent to a between the tooth root circle with radius r 3 A dot;
the eccentric rose line A 1 A 2 The coordinate equation of (2) is:
wherein θ is a parameter, a is an eccentricity measurement negative value, R is a Roots addendum circle radius, and c is an area utilization coefficient, wherein R+r=A, R P =a/2 is the pitch radius of the roots rotor.
As a further improvement of the invention, the eccentric rose line A 1 A 2 Is a conjugate envelope A of (2) 2 A 3 The coordinate equation of (2) is:
wherein a=r+r, a is a constant, the center distance of two roots rotors is expressed, θ is a parameter, a is a negative value of eccentricity, R is the radius of the tip circle of roots, and c is an area utilization coefficient;
gamma is a function of θ, formed byAnd (3) determining.
As a further improvement of the invention, the eccentric rose line A 1 A 2 With the conjugate envelope A 2 A 3 A intersecting on the pitch circle 2 Point and tangent to A 2 And (5) a dot.
The invention has the beneficial effects that: the invention enables the eccentric rose line A 1 A 2 And the symmetry line A 1 A 8 The smooth connection between the two parts solves the problem of sharp points, eliminates the problem of triangle leakage,improves the tightness, can independently adjust the sizes of the addendum circle and the root circle, and adjusts the eccentric rose line A 1 A 2 The eccentric amount a and the area utilization coefficient c of the Roots pump are improved, so that the area utilization coefficient is improved compared with the traditional Roots rotor end face molded line, the volumetric efficiency of the Roots pump is improved, the structure is compact, the pumping speed of the Roots pump is greatly improved, and the volume of the Roots pump is reduced.
Drawings
FIG. 1 is a schematic view of a rotor profile of the present invention;
FIG. 2 is an eccentric rose line A in the present invention 1 A 2 Is a schematic representation of the formation of (a);
FIG. 3 shows the rotor profile and L in the present invention 2 Is a comparative schematic of (a).
Detailed Description
The invention will now be described in further detail with reference to the drawings and examples. Wherein like parts are designated by like reference numerals. It should be noted that the words "front", "back", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "bottom" and "top", "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.
Referring to fig. 1 to 3, in the Roots rotor of this embodiment, the profile of the Roots rotor is composed of eight sections of curves connected end to end, and is an eccentric rose line a in a counterclockwise direction 1 A 2 The eccentric rose line A 1 A 2 Is a conjugate envelope A of (2) 2 A 3 The conjugate envelope A 2 A 3 Symmetry line A taking vertical direction as symmetry axis 3 A 4 The eccentric rose line A 1 A 2 Symmetry line A taking vertical direction as symmetry axis 4 A 5 The symmetry line A 4 A 5 Symmetry line A taking horizontal direction as symmetry axis 5 A 6 The symmetry line A 3 A 4 Symmetry line A taking horizontal direction as symmetry axis 6 A 7 The conjugate envelope A 2 A 3 Symmetry line A taking horizontal direction as symmetry axis 7 A 8 The eccentric rose line A 1 A 2 Symmetry line A taking horizontal direction as symmetry axis 8 A 1 ；
The eccentric rose line A 1 A 2 Tangent to the tooth top circle with radius R to be A 1 Dots such that the eccentric rose line A 1 A 2 And the symmetry line A 1 A 8 Smooth connection between the two, the eccentric rose line A 1 A 2 With the conjugate envelope A 2 A 3 The two parts are connected smoothly, so that the problem of sharp points is solved, and the problem of triangle leakage is eliminated;
the conjugate envelope A 2 A 3 Tangent to a between the tooth root circle with radius r 3 A dot;
the eccentric rose line A 1 A 2 The coordinate equation of (2) is:
wherein θ is a parameter, a is an eccentricity measurement negative value, R is a Roots addendum circle radius, and c is an area utilization coefficient, wherein R+r=A, R P The pitch radius of the roots rotor is =a/2, the roots rotor profile is applied to two roots rotors, the two roots rotors are conjugate and the profile is the same, and when the two rotors perform synchronous opposite constant-speed rotary motion, a complete meshing relationship can be realized.
Referring to FIG. 2, in the standard rose line, n is 1.5, and the standard rose line L is obtained 1 Through translation, the center point is translated to the point (a, 0) to obtain a complete eccentric rose line L 2 Keep eccentric rose line A 1 A 2 A portion;
in this embodiment, an eccentric rose line A 1 A 2 A in (2) 2 The point coincides with the intersection point of the pitch circle and the 45-degree oblique line, and A can be obtained 2 The distance between the point and the X-axis, thereby obtaining the area utilization coefficient c.
Referring to FIG. 1, what is shownThe eccentric rose line A 1 A 2 Is a conjugate envelope A of (2) 2 A 3 The coordinate equation of (2) is:
wherein a=r+r, a is a constant, the center distance of two roots rotors is expressed, θ is a parameter, a is a negative value of eccentricity, R is the radius of the tip circle of roots, and c is an area utilization coefficient;
gamma is a function of θ, formed byAnd (3) determining.
Referring to FIG. 1, the eccentric rose line A 1 A 2 With the conjugate envelope A 2 A 3 A intersecting on the pitch circle 2 Point and tangent to A 2 And (5) a dot.
The rotor molded line in the invention can independently adjust the sizes of the addendum circle and the dedendum circle, and adjust the eccentric rose line A 1 A 2 The eccentric amount a and the area utilization coefficient c of the Roots pump are improved, so that the area utilization coefficient is improved compared with the traditional Roots rotor end face molded line, the volumetric efficiency of the Roots pump is improved, the structure is compact, the pumping speed of the Roots pump is greatly improved, and the volume of the Roots pump is reduced.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (2)
1. A roots rotor, characterized in that: the molded line of the Roots rotor consists of eight sections of curves which are sequentially connected end to end, and is an eccentric rose line A sequentially in the anticlockwise direction 1 A 2 The saidEccentric rose line A 1 A 2 Is a conjugate envelope A of (2) 2 A 3 The conjugate envelope A 2 A 3 Symmetry line A taking vertical direction as symmetry axis 3 A 4 The eccentric rose line A 1 A 2 Symmetry line A taking vertical direction as symmetry axis 4 A 5 The symmetry line A 4 A 5 Symmetry line A taking horizontal direction as symmetry axis 5 A 6 The symmetry line A 3 A 4 Symmetry line A taking horizontal direction as symmetry axis 6 A 7 The conjugate envelope A 2 A 3 Symmetry line A taking horizontal direction as symmetry axis 7 A 8 The eccentric rose line A 1 A 2 Symmetry line A taking horizontal direction as symmetry axis 8 A 1 ；
The eccentric rose line A 1 A 2 Tangent to the tooth top circle with radius R to be A 1 Point of the eccentric rose line A 1 A 2 With the conjugate envelope A 2 A 3 Smooth connection is realized;
the conjugate envelope A 2 A 3 Tangent to a between the tooth root circle with radius r 3 A dot;
the eccentric rose line A 1 A 2 The coordinate equation of (2) is:
wherein θ is a parameter, a is an eccentricity measurement negative value, R is a Roots addendum circle radius, and c is an area utilization coefficient, wherein R+r=A, R P =a/2 is the pitch radius of the roots rotor;
the eccentric rose line A 1 A 2 Is a conjugate envelope A of (2) 2 A 3 The coordinate equation of (2) is:
wherein a=r+r, a is a constant, the center distance of two roots rotors is expressed, θ is a parameter, a is a negative value of eccentricity, R is the radius of the tip circle of roots, and c is an area utilization coefficient;
gamma is a function of θ, formed byAnd (3) determining.
2. A roots rotor according to claim 1, wherein: the eccentric rose line A 1 A 2 With the conjugate envelope A 2 A 3 A intersecting on the pitch circle 2 Point and tangent to A 2 And (5) a dot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210729576.6A CN115076103B (en) | 2022-06-24 | 2022-06-24 | Roots rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210729576.6A CN115076103B (en) | 2022-06-24 | 2022-06-24 | Roots rotor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115076103A CN115076103A (en) | 2022-09-20 |
| CN115076103B true CN115076103B (en) | 2023-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210729576.6A Active CN115076103B (en) | 2022-06-24 | 2022-06-24 | Roots rotor |
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| Country | Link |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103486041A (en) * | 2013-10-14 | 2014-01-01 | 山东伯仲真空设备股份有限公司 | Lobe pump rotor |
| CN206017138U (en) * | 2016-09-18 | 2017-03-15 | 中国石油大学(华东) | A kind of oval arc-shaped roots rotor |
| CN110259682A (en) * | 2019-07-24 | 2019-09-20 | 中国石油大学(华东) | A kind of bias involute roots rotor and its design method |
| CN110685906A (en) * | 2019-11-01 | 2020-01-14 | 西安交通大学 | Roots pump rotor and roots pump |
| WO2020134519A1 (en) * | 2018-12-28 | 2020-07-02 | 江南大学 | Method for determining reasonable design region of roots pump rotor profiles and use thereof |
-
2022
- 2022-06-24 CN CN202210729576.6A patent/CN115076103B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103486041A (en) * | 2013-10-14 | 2014-01-01 | 山东伯仲真空设备股份有限公司 | Lobe pump rotor |
| CN206017138U (en) * | 2016-09-18 | 2017-03-15 | 中国石油大学(华东) | A kind of oval arc-shaped roots rotor |
| WO2020134519A1 (en) * | 2018-12-28 | 2020-07-02 | 江南大学 | Method for determining reasonable design region of roots pump rotor profiles and use thereof |
| CN110259682A (en) * | 2019-07-24 | 2019-09-20 | 中国石油大学(华东) | A kind of bias involute roots rotor and its design method |
| CN110685906A (en) * | 2019-11-01 | 2020-01-14 | 西安交通大学 | Roots pump rotor and roots pump |
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| Publication number | Publication date |
|---|---|
| CN115076103A (en) | 2022-09-20 |
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