CN110878754A - Two-blade rotor profile of Roots vacuum pump - Google Patents
Two-blade rotor profile of Roots vacuum pump Download PDFInfo
- Publication number
- CN110878754A CN110878754A CN201911342871.0A CN201911342871A CN110878754A CN 110878754 A CN110878754 A CN 110878754A CN 201911342871 A CN201911342871 A CN 201911342871A CN 110878754 A CN110878754 A CN 110878754A
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- Prior art keywords
- rotors
- line segment
- vacuum pump
- roots vacuum
- cycloid
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- 230000000630 rising effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 238000005086 pumping Methods 0.000 description 2
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
Images
Classifications
-
- 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
- F04C18/084—Toothed wheels
-
- 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
-
- 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)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The invention discloses a two-blade rotor profile of a Roots vacuum pump, which comprises two rotors and a pump cavity, wherein the section profiles of the two rotors are completely consistent, and the two rotors synchronously rotate in the pump cavity in a forward and reverse direction, the two-blade rotor profile of the Roots vacuum pump has higher volumetric efficiency, simultaneously, the rotors have higher strength and rigidity and are easy to process, in addition, the rotors have good geometric symmetry, so that the meshing performance between the profiles of the two rotors is good, and the gap is uniform, therefore, when the rotors rotate at high speed, gas can be conveyed to a high-pressure area from low pressure, the stable operation and the good interchangeability can be ensured, meanwhile, the four-section profiles in the two-blade rotor profile are all smoothly connected, no leakage area exists, and the DE section of the gap between the two rotors and the pump cavity is a circular arc section, so that the gas resistance of the gap is increased when the two rotors operate, and the backflow is reduced, so that the use effect of the Roots vacuum pump is greatly improved.
Description
Technical Field
The invention belongs to the technical field of Roots vacuum pumps, and particularly relates to a two-blade rotor profile of a Roots vacuum pump.
Background
The rotor profile of the Roots vacuum pump is usually two types of involute type and arc type, compared with the involute type rotor, the arc type rotor of the Roots vacuum pump has the advantages of low noise, high efficiency and the like, the prior rotors are usually two types of external arc and conjugate curve type or internal arc and conjugate curve type, when the two types of rotors are designed, the radius ratio Rm/R of the top circle radius Rm and the pitch circle radius R of the rotor is an important parameter which determines the air volume of the Roots vacuum pump and the pumping rate of the Roots vacuum pump, the larger the ratio is, the thinner and higher the rotor is, the higher the area utilization coefficient of the rotor is, the larger the air volume and the pumping rate are, but if the ratio is larger than a certain extreme value, the two traditional profiles of the external arc and the conjugate curve type or the internal arc and the conjugate curve type are not adopted, the profile design is limited, the prior rotors are usually two-blade rotor type or, however, the number of the rotor profiles related to four or more than four is small, the meshing performance between the rotor profiles of the two existing lobes is poor, gaps are not uniform enough, the volume efficiency is low, the strength and the rigidity of the rotor are poor, and the rotor is difficult to machine.
The invention content is as follows:
the present invention aims to solve the above problems by providing a two-lobe rotor profile for a roots vacuum pump, which solves the problems mentioned in the background art.
In order to solve the above problems, the present invention provides a technical solution:
the two-blade rotor profile of the Roots vacuum pump comprises two rotors and a pump cavity, wherein the section profiles of the two rotors are completely consistent, and the two rotors synchronously rotate in the pump cavity in a forward direction and a reverse direction.
Preferably, a small gap exists between the two rotors, the gap between the two rotors is kept constant, the molded lines of the two rotors are conjugate curves, the volume ratio between the two rotors and the pump cavity is small, and the two rotors have good geometric symmetry.
Preferably, the rotor profile is composed of four curves which are connected in sequence and have a falling and fluctuating shape, the profile from an initial point to a lowest point is formed by sequentially connecting a first arc line segment (AB), a first cycloid line segment (BC), a second cycloid line segment (CD) and a second arc line segment (DE), the radius of the second arc line segment (DE) is larger than that of the first arc line segment (AB), the radius of the first arc line segment (AB) is larger than that of the first cycloid line segment (BC), the radius of the first cycloid line segment (BC) is larger than that of the second cycloid line segment (CD), and the first cycloid line segment (AB) and the second arc line segment (DE) are in transitional connection through the first cycloid line segment (BC) and the second cycloid line segment (CD).
Preferably, a coordinate system is constructed with the center of the base circle as the origin of coordinates, the radius of the base circle is Rf, and the linear distance between the C point and the center of the circle is Rf.
Preferably, the profile parameter equation of the first arc segment (AB) is:
X＝Rb*cos(θ)；
Y＝Rb*sin(θ)。
preferably, the profile parameter equation of the first cycloid segment (BC) is:
X＝(Rf-r)*cos(θ)+r*cos[(Rf-r)*θ/r]；
Y＝(Rf-r)*sin(θ)+r*sin[(Rf-r)*θ/r]；
in the formula: r ═ r (Rf-Rb)/2.
Preferably, the profile parameter equation of the second cycloid segment (CD) is:
X＝(Rf+r)*cos(θ)-r*cos[(Rf+r)*θ/r]；
Y＝(Rf+r)*sin(θ)-r*sin[(Rf+r)*θ/r]；
in the formula: r is (Rt-Rf)/2.
Preferably, the profile parameter equation of the second arc segment (DE) is:
X＝Rt*cos(θ)；
Y＝Rt*sin(θ)。
preferably, in the formula: rf ═ Rt + Rb)/2.
The invention has the beneficial effects that: the invention relates to a two-blade rotor profile of a Roots vacuum pump, which has the following advantages compared with the two-blade rotor profile of the traditional Roots vacuum pump:
the invention has larger volume efficiency, simultaneously the rotor has higher strength and rigidity and is easy to process, in addition, the rotor has good geometric symmetry, so that the meshing performance between the molded lines of the two rotors is good, the gap is uniform, thus the rotor can convey gas to flow from low pressure to a high pressure area when rotating at high speed, the stable operation and the good interchangeability can be ensured, simultaneously, the four sections of molded lines in the molded lines of the two rotors are all smoothly connected, no leakage area exists, and the DE section of the gap between the two rotors and the pump cavity is a circular arc section, so that the air resistance of the gap is increased when the two rotors operate, the reverse flow is reduced, and the use effect of the Roots vacuum pump is greatly improved.
Description of the drawings:
for ease of illustration, the invention is described in detail by the following detailed description and the accompanying drawings.
FIG. 1 is a schematic view of a rotor profile structure of the present invention;
fig. 2 is a schematic view of the rotor profile coordinates of the present invention.
In the figure: AB. A first arc segment; BC. A first cycloid segment; CD. A second cycloid segment; DE. A second arc segment.
The specific implementation mode is as follows:
as shown in fig. 1-2, the following technical solutions are adopted in the present embodiment:
example (b):
the two-blade rotor profile of the Roots vacuum pump comprises two rotors and a pump cavity, the section profiles of the two rotors are completely consistent, and the two rotors synchronously rotate in the pump cavity in a forward direction and a reverse direction.
Wherein, there is very small interval between two rotors, the interval between two rotors keeps certain, because can keep certain very small interval and will not touch between two rotors, can convey the gas and flow to the high-pressure area from the low pressure while rotating at a high speed in this way two rotors; the molded lines of the two rotors are conjugate curves, and the volume ratio between the two rotors and the pump cavity is smaller, so that the volume utilization coefficient of the pump rotor is larger; the two rotors have good geometric symmetry, so that the equipment can be conveniently and better ensured to run stably and have better interchangeability; the two rotors are made of nodular cast iron, so that the two rotors can have enough strength, the two rotors can be processed more simply and quickly, and the rotors with higher precision can be obtained easily.
Wherein, the rotor profile is composed of four curves which are connected in sequence and fall, the profile from the initial point to the lowest point is composed of a first arc line segment (AB), a first cycloid line segment (BC), a second cycloid line segment (CD) and a second arc line segment (DE) which are connected in sequence, the radius of the second arc line segment (DE) is larger than that of the first arc line segment (AB), the radius of the first arc line segment (AB) is larger than that of the first cycloid line segment (BC), the radius of the first cycloid line segment (BC) is larger than that of the second cycloid line segment (CD), the first arc line segment (AB) and the second arc line segment (DE) are in transitional connection through the first cycloid line segment (BC) and the second cycloid line segment (CD), the smooth connection four-segment structure ensures that the two rotors do not generate interference after the rotor molding, and the same meshing distance is kept between the driving rotor and the driven rotor all the time, thereby making the operation of the device more smooth.
A coordinate system is constructed by taking the center of a base circle as a coordinate origin, the radius of the base circle is Rf, and the linear distance between a C point and the center of the circle is Rf, so that the two rotor molded lines can be better analyzed.
The molded line parameter equation of the first arc segment (AB) is as follows:
X＝Rb*cos(θ)；
Y＝Rb*sin(θ)。
the molded line parameter equation of the first cycloid segment (BC) is as follows:
X＝(Rf-r)*cos(θ)+r*cos[(Rf-r)*θ/r]；
Y＝(Rf-r)*sin(θ)+r*sin[(Rf-r)*θ/r]；
in the formula: r ═ r (Rf-Rb)/2.
Wherein, the profile parameter equation of the second cycloid section (CD) is:
X＝(Rf+r)*cos(θ)-r*cos[(Rf+r)*θ/r]；
Y＝(Rf+r)*sin(θ)-r*sin[(Rf+r)*θ/r]；
in the formula: r is (Rt-Rf)/2.
The molded line parameter equation of the second arc line segment (DE) is as follows:
X＝Rt*cos(θ)；
Y＝Rt*sin(θ)。
wherein, in the formula: rf ═ Rt + Rb)/2, according to the profile parameter equation above, so that a complete profile can be obtained by setting two dimensional parameters Rt and Rb.
The using state of the invention is as follows: as shown in FIG. 2, the rotor section profile is a symmetrical form, a complete rotor profile can be formed by only determining profiles within a range of ninety degrees, and the rotor profile has a large volumetric efficiency, so that the working efficiency of two rotors is high, and simultaneously, the rotors have high strength and rigidity, are easy to process, and are easy to obtain rotors with high precision, and in addition, the rotors have good geometric symmetry, so that the meshing between the profiles of the two rotors is good, and the gap is uniform, so that when the pair of rotors rotate at high speed, gas can be conveyed to flow from low pressure to high pressure area, and the stable operation and good interchangeability can be ensured, meanwhile, four sections of profiles inside the profiles of the two-blade rotors are all smoothly connected, no leakage area exists, and the DE section of the gap between the two rotors and the pump cavity is a circular arc section, so that the gas resistance of the gap is increased when the two rotors operate, and backflow is reduced, so that the use effect of the gas booster pump is greatly improved.
While there have been shown and described what are at present considered to be the fundamental principles of the invention and its essential features and advantages, it will be understood by those skilled in the art that the invention is not limited by the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (9)
1. The two-blade rotor profile of the Roots vacuum pump is characterized by comprising two rotors and a pump cavity, wherein the section profiles of the two rotors are completely consistent, and the two rotors synchronously rotate in the pump cavity in a forward direction and a reverse direction.
2. The two-lobe rotor profile of a roots vacuum pump according to claim 1, characterized in that: a small gap exists between the two rotors, the gap between the two rotors is kept constant, the molded lines of the two rotors are conjugate curves, the volume ratio between the two rotors and a pump cavity is small, and the two rotors have good geometric symmetry.
3. The two-lobe rotor profile of a roots vacuum pump according to claim 1, characterized in that: the rotor molded line is composed of four curves which are connected in sequence and have a falling and rising effect, the molded line from an initial point to a lowest point is formed by sequentially connecting a first arc line segment (AB), a first cycloid line segment (BC), a second cycloid line segment (CD) and a second arc line segment (DE), the radius of the second arc line segment (DE) is larger than that of the first arc line segment (AB), the radius of the first arc line segment (AB) is larger than that of the first cycloid line segment (BC), the radius of the first cycloid line segment (BC) is larger than that of the second cycloid line segment (CD), and the first cycloid line segment (AB) and the second arc line segment (DE) are in transitional connection through the first cycloid line segment (BC) and the second cycloid line segment (CD).
4. The two-lobe rotor profile of a roots vacuum pump according to claim 1, characterized in that: and (3) constructing a coordinate system by taking the center of the base circle as a coordinate origin, wherein the radius of the base circle is Rf, and the linear distance between the C point and the center of the circle is Rf.
5. A two-lobe rotor profile for a roots vacuum pump according to claim 3, wherein: the molded line parameter equation of the first arc segment (AB) is as follows:
X＝Rb*cos(θ)；
Y＝Rb*sin(θ)。
6. a two-lobe rotor profile for a roots vacuum pump according to claim 3, wherein: the linear parameter equation of the first cycloid segment (BC) is as follows:
X＝(Rf-r)*cos(θ)+r*cos[(Rf-r)*θ/r]；
Y＝(Rf-r)*sin(θ)+r*sin[(Rf-r)*θ/r]；
in the formula: r ═ r (Rf-Rb)/2.
7. A two-lobe rotor profile for a roots vacuum pump according to claim 3, wherein: the profile parameter equation of the second cycloid segment (CD) is as follows:
X＝(Rf+r)*cos(θ)-r*cos[(Rf+r)*θ/r]；
Y＝(Rf+r)*sin(θ)-r*sin[(Rf+r)*θ/r]；
in the formula: r is (Rt-Rf)/2.
8. A two-lobe rotor profile for a roots vacuum pump according to claim 3, wherein: the molded line parameter equation of the second arc segment (DE) is as follows:
X＝Rt*cos(θ)；
Y＝Rt*sin(θ)。
9. a two-lobe rotor profile for a roots vacuum pump according to claims 5, 6, 7 and 8, wherein: in the formula: rf ═ Rt + Rb)/2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911342871.0A CN110878754A (en) | 2019-12-23 | 2019-12-23 | Two-blade rotor profile of Roots vacuum pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911342871.0A CN110878754A (en) | 2019-12-23 | 2019-12-23 | Two-blade rotor profile of Roots vacuum pump |
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| CN110878754A true CN110878754A (en) | 2020-03-13 |
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| CN201911342871.0A Pending CN110878754A (en) | 2019-12-23 | 2019-12-23 | Two-blade rotor profile of Roots vacuum pump |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114508487A (en) * | 2022-03-01 | 2022-05-17 | 山东明天机械集团股份有限公司 | Arc-shaped Roots rotor and molded line design method thereof |
| CN115289017A (en) * | 2022-08-30 | 2022-11-04 | 山东亿宁环保科技有限公司 | Multi-claw rotor with same shape |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998027341A1 (en) * | 1996-12-16 | 1998-06-25 | Zhangqiu Blower Factory, Shandong | New structure of roots blower or roots vacuum pump with a multi-lobes impeller and a reverse flow unit |
| CN203189267U (en) * | 2013-04-17 | 2013-09-11 | 大连交通大学 | Conjugated internal-external cycloid involute-type rotor of roots vacuum pump |
| CN205578260U (en) * | 2016-04-22 | 2016-09-14 | 山东伯仲真空设备股份有限公司 | Novel three leaf lobe pump rotor molded liness |
| CN106762654A (en) * | 2016-12-31 | 2017-05-31 | 浙江创为真空设备有限公司 | A kind of bilobal rotor assembly of Roots vaccum pump |
| CN107725364A (en) * | 2017-11-21 | 2018-02-23 | 山东伯仲真空设备股份有限公司 | Leafy lobe pump universal line |
| CN108757448A (en) * | 2018-07-12 | 2018-11-06 | 中国石油大学(华东) | Three leaf sectional circular camber roots rotors of one kind and its Profile Design method |
| CN109630409A (en) * | 2018-11-20 | 2019-04-16 | 宿迁学院 | A kind of oval arc-shaped roots pump rotor with high dischargeable capacity rate |
-
2019
- 2019-12-23 CN CN201911342871.0A patent/CN110878754A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998027341A1 (en) * | 1996-12-16 | 1998-06-25 | Zhangqiu Blower Factory, Shandong | New structure of roots blower or roots vacuum pump with a multi-lobes impeller and a reverse flow unit |
| CN203189267U (en) * | 2013-04-17 | 2013-09-11 | 大连交通大学 | Conjugated internal-external cycloid involute-type rotor of roots vacuum pump |
| CN205578260U (en) * | 2016-04-22 | 2016-09-14 | 山东伯仲真空设备股份有限公司 | Novel three leaf lobe pump rotor molded liness |
| CN106762654A (en) * | 2016-12-31 | 2017-05-31 | 浙江创为真空设备有限公司 | A kind of bilobal rotor assembly of Roots vaccum pump |
| CN107725364A (en) * | 2017-11-21 | 2018-02-23 | 山东伯仲真空设备股份有限公司 | Leafy lobe pump universal line |
| CN108757448A (en) * | 2018-07-12 | 2018-11-06 | 中国石油大学(华东) | Three leaf sectional circular camber roots rotors of one kind and its Profile Design method |
| CN109630409A (en) * | 2018-11-20 | 2019-04-16 | 宿迁学院 | A kind of oval arc-shaped roots pump rotor with high dischargeable capacity rate |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114508487A (en) * | 2022-03-01 | 2022-05-17 | 山东明天机械集团股份有限公司 | Arc-shaped Roots rotor and molded line design method thereof |
| CN114508487B (en) * | 2022-03-01 | 2024-05-03 | 山东明天机械集团股份有限公司 | Arc Roots rotor and molded line design method thereof |
| CN115289017A (en) * | 2022-08-30 | 2022-11-04 | 山东亿宁环保科技有限公司 | Multi-claw rotor with same shape |
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