CN108343605B - Three-jaw type vacuum pump - Google Patents
Three-jaw type vacuum pump Download PDFInfo
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- CN108343605B CN108343605B CN201810440688.3A CN201810440688A CN108343605B CN 108343605 B CN108343605 B CN 108343605B CN 201810440688 A CN201810440688 A CN 201810440688A CN 108343605 B CN108343605 B CN 108343605B
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- claw
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- arc
- type rotor
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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
- F04C18/14—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 toothed rotary pistons
- F04C18/18—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 toothed rotary pistons with similar tooth forms
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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
- F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
- F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
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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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
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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
- F04C2240/00—Components
- F04C2240/20—Rotors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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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 three-jaw type vacuum pump, wherein a jaw top arc and a jaw bottom arc of a left-jaw type rotor are connected in a smooth manner by a sinusoidal line, and a jaw top arc and a jaw bottom arc of a right-jaw type rotor are connected in a smooth manner by an envelope line of the sinusoidal line; the design process of the three-jaw rotor is effectively simplified, the value range of design parameters is enlarged, and the working performance of the three-jaw rotor is improved; meanwhile, the axial exhaust port is designed according to the molded lines of the left claw type rotor and the right claw type rotor, so that the gas in the exhaust cavity can be completely exhausted, the generation of secondary clearance volume and the over-compression process of the gas are avoided, and the energy consumption in the working process is effectively reduced.
Description
Technical Field
The invention relates to the technical field of vacuum acquisition equipment, in particular to a three-jaw vacuum pump.
Background
The claw type vacuum pump is a positive displacement fluid machine, and the suction, compression and discharge processes of gas are realized by periodically changing the volume of a working cavity through the synchronous opposite double-rotation motion of a pair of claw type rotors which are meshed with each other; has the advantages of simple structure, stable operation, low noise and dry oil-free, and has wide application in the electronic and petrochemical industry.
In order to improve the pumping speed of the claw type vacuum pump and the dynamic balance of the claw type rotor, a double-claw or three-claw type rotor is generally adopted. Patent CN100526608C proposes a linear arc three-jaw rotor and its design method, the left rotor of this rotor is composed of cycloid, eccentric arc and line segment, and the right rotor is composed of cycloid, arc envelope and linear envelope. The linear arc three-jaw rotor has more constraint conditions required for realizing smooth connection between linear arc three-jaw rotor molded lines, so that the rotor design process is complex; meanwhile, the linear envelope line has the characteristic of partial meshing, and singular points can appear on the linear envelope line when the line segment is longer than a certain length, so that the value range of parameters is smaller when the linear arc three-jaw rotor is subjected to parameterization design.
Disclosure of Invention
In order to solve the problems, the invention adopts the sine line and the envelope line of the sine line as the rotor molded lines of the three-jaw vacuum pump, smoothly connects the top arc and the bottom arc, simplifies the design process of the three-jaw vacuum pump rotor, and expands the parameter value range of the three-jaw rotor. Meanwhile, an exhaust port of the three-jaw vacuum pump is designed according to the designed novel rotor, and the exhaust process without over-compression and secondary clearance is realized.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a three-jaw vacuum pump comprising: a left claw rotor 1, a right claw rotor 2, a cavity 3 and an exhaust end cover 4; the method is characterized in that: the profile of the left-claw rotor 1 is about its centre of rotation O 1 With 120 centre symmetry, i.e. the left-claw rotor 1 is about its centre of rotation O 1 After rotating anticlockwise or clockwise for 120 degrees, the two parts are completely overlapped with each other; the profile of the right-claw rotor 2 is about its centre of rotation O 2 With 120 centre symmetry, i.e. right-claw rotor 2 about its centre of rotation O 2 After rotating anticlockwise or clockwise for 120 degrees, the two parts are completely overlapped with each other; one third of the molded lines of the left claw rotor 1 are in turn: a left cycloid AB, a left point B, a left claw top arc BC, a sine line CD and a left claw bottom arc DE; one third of the molded lines of the right claw rotor 2 are in turn: a right cycloid ab, a right point b, a right claw top arc bc, an envelope line cd of a sine line and a right claw bottom arc de; the molded lines of the left claw rotor 1 and the right claw rotor 2 are identical except for the positive chord line CD and the enveloping line CD of the positive chord line; the working mode is that the left claw type rotor 1 and the right claw type rotor 2 do synchronous opposite double-rotation motion, and a left point B, a left cycloid AB, a left claw top arc BC, a sine line CD and a left claw bottom arc DE of the left claw type rotor 1 are meshed with a right cycloid AB, a right point B, a right claw bottom arc DE, an envelope line CD of a sine line and a right claw top arc BC of the right claw type rotor 2 in sequence.
A three-jaw vacuum pump is characterized in that: the arc angles of the claw top and the claw bottom of the left claw type rotor 1 are equal and are alpha, and the central angles corresponding to the envelope line CD of the sinusoidal line of the left claw type rotor 1 and the envelope line CD of the sinusoidal line of the right claw type rotor 2 are equal and are theta; the relationship between θ and α is: θ+2α=2pi/3;
the equation for the left cycloid AB is:
the equation for the left paw top arc BC is:
the equation for the sinusoidal line CD is:
the equation for the left paw bottom arc DE is:
the equation of the envelope cd of the sinusoidal line of the right claw rotor 2 is:
in the method, in the process of the invention,
the following steps: t-angle parameter, rad; r is R 1 -claw top arc radius, mm; r is R 2 Pitch radius, mm; r is R 3 -radius of the claw bottom arc, mm; and 2R 2 ＝R 1 +R 3 。
A three-jaw vacuum pump is characterized in that: the exhaust end cover 4 is provided with an exhaust port 401, and the profile curve of the exhaust port 401 comprises: a bottom edge line HJ, a left edge line JI, a right edge line IH, a right vertex H, an upper vertex I, and a left vertex J; the bottom edge HJ is a partial curve of an envelope line cd of a sine line, the left edge JI is a section of circular arc, and the right edge IH is a section of straight line; the profile HIJ is the maximum opening range of the exhaust port.
Profile curve of exhaust port 401The determining method comprises the following steps: according to the set internal volume ratio, by suction chamber C 1 、C 2 Is defined by the volume of the exhaust chamber C d To determine the relative positions of the left-jaw rotor 1 and the right-jaw rotor 2 at the start of exhaust; near the exhaust chamber C d At the position, the intersection point of the envelope line cd of the positive chord line and the right claw bottom arc de is the right top point H of the exhaust port 401, and the envelope line cd of the positive chord line and the circle center are positioned at the rotation center point O of the left claw rotor 1 1 Radius R 1 The intersection point of the circles of the left claw rotor 1 is the left vertex J of the exhaust port 401, and the circle center is positioned at the rotation center point O of the left claw rotor 1 1 Radius R 1 Is connected with the rotation center of the two rotors 1 O 2 The intersection of which is the upper apex I of the exhaust port 401.
The beneficial effects of the invention are as follows:
(1) The enveloping lines of the sine lines and the sine lines are adopted to connect the claw top and claw bottom circular arcs, the composition curves of the rotor are few, and the claw type rotor is convenient to design and optimize.
(2) According to the exhaust port designed according to the molded line, the gas in the exhaust cavity can be completely exhausted, the energy consumption of the three-jaw vacuum pump is reduced, and the working efficiency of the three-jaw vacuum pump is improved.
Drawings
FIG. 1 is a diagram of a three-jaw vacuum pump.
Fig. 2 is a left-jaw rotor profile.
Fig. 3 right-jaw rotor profile.
Fig. 4 is a front view of an exhaust end cap.
Fig. 5 is a diagram of the exhaust opening process.
FIG. 6 is a diagram of the operation of the three-jaw vacuum pump.
Detailed Description
The invention will be further described with reference to the drawings and examples.
As shown in fig. 1, a main structure diagram of a three-jaw vacuum pump includes a left-jaw rotor 1, a right-jaw rotor 2, a cavity 3 and an exhaust end cover 4, wherein gas radially enters the cavity 3 through an air suction port on the cavity 3, and the gas in the cavity 3 is transported and compressed along with the rotation of the left-jaw rotor 1 and the right-jaw rotor 2, and is discharged in the axial direction through an exhaust port 401 on the exhaust end cover when the gas rotates to an exhaust port position.
As shown in fig. 2, which is a component diagram of the left-claw rotor 1, the molded line of the left-claw rotor 1 is about its rotation center O 1 With 120 degree central symmetry, the left claw rotor 1 is about its centre of rotation O 1 After being rotated by 120 degrees anticlockwise or clockwise, the two parts are completely overlapped with each other. One third of the molded lines of the left claw rotor 1 are in turn: the left cycloid AB, the left point B, the left claw top arc BC, the sine line CD and the left claw bottom arc DE are equal, the claw top arc angle and the claw bottom arc angle of the left claw type rotor 1 are alpha, the center angle corresponding to the positive chord line CD in the left claw type rotor 1 is theta, theta+2alpha=2pi/3, and the claw top arc radius of the left claw type rotor 1 is R 1 The radius of the claw bottom arc is R 3 。
As shown in fig. 3, which is a composition diagram of the right-claw rotor 2, the molded line of the right-claw rotor 2 is about its rotation center O 2 With 120 degree central symmetry, the right claw rotor 2 is around its rotation center O 2 After being rotated by 120 degrees anticlockwise or clockwise, the two parts are completely overlapped with each other. One third of the molded lines of the right claw rotor 2 are in turn: a right cycloid ab, a right point b, a right claw top arc bc, an envelope line cd of a sine line and a right claw bottom arc de. The claw top arc angle and the claw bottom arc angle of the right claw type rotor 2 are equal and are alpha, the central angle corresponding to the envelope line cd of the positive chord line in the right claw type rotor 2 is theta, theta+2alpha=2pi/3, and the claw top arc radius of the right claw type rotor 2 is R 1 The radius of the claw bottom arc is R 3 。
As shown in fig. 4, which is a front view of the exhaust end cover, the exhaust port 401 is opened on the exhaust end cover 4, and the profile curve of the exhaust port 401 includes a partial curve JH, an arc IJ and a line segment IH of the envelope of the sinusoidal line.
As shown in fig. 5, which shows the opening of the exhaust port 401, each section of profile curve is shown by a broken line in the figure, and is defined by the suction volume C according to the set internal volume ratio 1 And C 2 Determining the exhaust chamber C d To determine the relative positions of the left-jaw rotor 1 and the right-jaw rotor 2 at the start of exhaust; near the exhaust chamber C d The intersection point of the envelope line cd of the positive chord line and the right claw bottom arc de is the exhaustThe right vertex H of the port 401, the envelope cd of the sine line and the circle center are positioned at the rotation center point O of the left claw rotor 1 1 Radius R 1 The intersection point of the circles of (1) is the left vertex J of the exhaust port 401, and the circle center is positioned at the rotation center point O of the left-turning rotor 1 1 Radius R 1 Is connected with the rotation center of the two rotors 1 O 2 The intersection of which is the upper apex I of the exhaust port 401.
As shown in fig. 6, which is a diagram showing the operation of the three-jaw vacuum pump, the air shown in fig. 6 (a) enters the cavity from the suction port and is delivered isobarically with the rotation of the rotor; in FIG. 6 (b) the gas entering the chamber forms two enclosed volumes C between the rotor and the chamber wall as the rotor rotates 1 And C 2 At this time, the air suction process is completed once, and the air suction volume is C 1 And C 2 Sum of volumes; c when the rotor rotates to the position shown in fig. 6 (C) 1 The gas in (C) is compressed first 2 The gas in (2) remains unchanged in volume. As shown in FIG. 6 (d) C 1 And C 2 The gases in (a) are mixed to form a working chamber C 3 C with rotation of the rotor 3 Is continuously compressed. As shown in FIG. 6 (e) C 3 Is divided into C V And C 4 Two parts, C V Namely the clearance volume, C V The air in the air conditioner is brought back to the air suction port along with the rotation of the rotor, C 4 The gas in (c) continues to be compressed. As shown in FIGS. 6 (f) to 6 (i), C 4 After the gas in (C) reaches the critical position 4 The medium gas is communicated with the exhaust port to form an exhaust cavity C d And enters an isobaric exhaust process. The right claw rotor 2 completely covers the exhaust chamber C of the exhaust port 401 as shown in fig. 6 (j) d The gas in the chamber is completely exhausted, and the exhaust process is finished.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (1)
1. A three-jaw vacuum pump, comprising: the device comprises a left claw type rotor (1), a right claw type rotor (2), a cavity (3) and an exhaust end cover (4); the method is characterized in that: the profile of the left claw rotor (1) is about its centre of rotation O 1 Is 120 DEG centrosymmetric, i.e. the left-claw rotor (1) is about its centre of rotation O 1 After rotating anticlockwise or clockwise for 120 degrees, the two parts are completely overlapped with each other; the profile of the right claw rotor (2) is about its centre of rotation O 2 Is 120 DEG centrosymmetric, i.e. the right-claw rotor (2) is about its centre of rotation O 2 After rotating anticlockwise or clockwise for 120 degrees, the two parts are completely overlapped with each other; one third of the molded lines of the left claw type rotor (1) are sequentially as follows: a left cycloid AB, a left point B, a left claw top arc BC, a sine line CD and a left claw bottom arc DE; one third of the molded lines of the right claw type rotor (2) are sequentially as follows: a right cycloid ab, a right point b, a right claw top arc bc, an envelope line cd of a sine line and a right claw bottom arc de; the molded lines of the left claw rotor (1) and the right claw rotor (2) are identical except for a positive chord line CD and an envelope line CD of the positive chord line; the working mode is that a left claw type rotor (1) and a right claw type rotor (2) do synchronous opposite double-rotation motion, a left point B, a left cycloid AB, a left claw top arc BC, a sine line CD and a left claw bottom arc DE of the left claw type rotor (1) are meshed with a right cycloid AB, a right point B, a right claw bottom arc DE, a sine envelope CD and a right claw top arc BC of the right claw type rotor (2) in sequence;
the arc angles of the top and bottom of the left claw type rotor (1) are equal, alpha is the arc angle, and the central angles corresponding to the envelope line CD of the sinusoidal line of the left claw type rotor (1) and the envelope line CD of the sinusoidal line of the right claw type rotor (2) are equal, theta is the arc angle; the relationship between θ and α is: θ+2α=2pi/3;
the equation for the left cycloid AB is:
the equation for the left paw top arc BC is:
the equation for the sinusoidal line CD is:
the equation for the left paw bottom arc DE is:
the equation of the envelope cd of the sinusoidal line of the right claw rotor (2) is:
in the method, in the process of the invention,
the following steps: t-angle parameter, rad; r is R 1 -claw top arc radius, mm; r is R 2 Pitch radius, mm; r is R 3 -radius of the claw bottom arc, mm; and 2R 2 ＝R 1 +R 3 ；
An exhaust port (401) is formed in the exhaust end cover (4), and the profile curve of the exhaust port (401) comprises: a bottom edge line HJ, a left edge line JI, a right edge line IH, a right vertex H, an upper vertex I, and a left vertex J; the bottom edge HJ is a partial curve of an envelope line cd of a sine line, the left edge JI is a section of circular arc, and the right edge IH is a section of straight line;
the method for determining the profile curve of the exhaust port (401) comprises the following steps: according to the set internal volume ratio, by suction chamber C 1 、C 2 Is defined by the volume of the exhaust chamber C d Further determining the relative position of the left claw rotor (1) and the right claw rotor (2) at the beginning of the exhaust; near the exhaust chamber C d The intersection point of the envelope line cd of the sine line and the right claw bottom arc de is the right top point H of the exhaust port (401), and the envelope line cd of the sine line and the circle center are positioned at the rotation center point O of the left claw rotor (1) 1 Radius R 1 The intersection point of the circles of the left claw type rotor (1) is the left top point J of the exhaust port (401), and the circle center is positioned at the rotation center point O of the left claw type rotor 1 Radius R 1 Is connected with the rotation center of the two rotors 1 O 2 The intersection of (a) is the upper apex I of the exhaust port (401).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810440688.3A CN108343605B (en) | 2018-05-10 | 2018-05-10 | Three-jaw type vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810440688.3A CN108343605B (en) | 2018-05-10 | 2018-05-10 | Three-jaw type vacuum pump |
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| Publication Number | Publication Date |
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| CN108343605A CN108343605A (en) | 2018-07-31 |
| CN108343605B true CN108343605B (en) | 2023-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810440688.3A Active CN108343605B (en) | 2018-05-10 | 2018-05-10 | Three-jaw type vacuum pump |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113167274B (en) * | 2018-10-19 | 2024-01-30 | 阮海 | Rotary compression mechanism, rotary compressor and rotary engine |
| CN110566457B (en) * | 2019-09-03 | 2020-07-10 | 乐清市芮易经济信息咨询有限公司 | Gas-liquid mixing and conveying device with three-jaw rotor |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB527339A (en) * | 1939-04-06 | 1940-10-07 | Paul Leistritz | Improvements in screw pumps or screw motors |
| JPH08189485A (en) * | 1995-01-11 | 1996-07-23 | Ebara Corp | Screw machine |
| CN1312437A (en) * | 2001-04-26 | 2001-09-12 | 北京朗禾科技有限公司 | Dry vacuum pump |
| CN2646419Y (en) * | 2003-09-30 | 2004-10-06 | 巴一 | Asymmetric claw type dry vacuum pump |
| CN1987051A (en) * | 2005-12-23 | 2007-06-27 | 良峰塑胶机械股份有限公司 | Design method for blade of claw rotor |
| CN100526608C (en) * | 2006-01-05 | 2009-08-12 | 良峰塑胶机械股份有限公司 | Tri-claw and more design method for claw type rotor |
| CN103775341A (en) * | 2012-10-15 | 2014-05-07 | 良峰塑胶机械股份有限公司 | Claw type rotor pair apparatus with two rotors having the same shape |
| CN208138139U (en) * | 2018-05-10 | 2018-11-23 | 中国石油大学(华东) | A kind of three-jaw claw vacuum pump |
-
2018
- 2018-05-10 CN CN201810440688.3A patent/CN108343605B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB527339A (en) * | 1939-04-06 | 1940-10-07 | Paul Leistritz | Improvements in screw pumps or screw motors |
| JPH08189485A (en) * | 1995-01-11 | 1996-07-23 | Ebara Corp | Screw machine |
| CN1312437A (en) * | 2001-04-26 | 2001-09-12 | 北京朗禾科技有限公司 | Dry vacuum pump |
| CN2646419Y (en) * | 2003-09-30 | 2004-10-06 | 巴一 | Asymmetric claw type dry vacuum pump |
| CN1987051A (en) * | 2005-12-23 | 2007-06-27 | 良峰塑胶机械股份有限公司 | Design method for blade of claw rotor |
| CN100526608C (en) * | 2006-01-05 | 2009-08-12 | 良峰塑胶机械股份有限公司 | Tri-claw and more design method for claw type rotor |
| CN103775341A (en) * | 2012-10-15 | 2014-05-07 | 良峰塑胶机械股份有限公司 | Claw type rotor pair apparatus with two rotors having the same shape |
| CN208138139U (en) * | 2018-05-10 | 2018-11-23 | 中国石油大学(华东) | A kind of three-jaw claw vacuum pump |
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| CN108343605A (en) | 2018-07-31 |
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