CN210218110U - Efficient three-jaw claw formula vacuum pump - Google Patents
Efficient three-jaw claw formula vacuum pump Download PDFInfo
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- CN210218110U CN210218110U CN201921169741.7U CN201921169741U CN210218110U CN 210218110 U CN210218110 U CN 210218110U CN 201921169741 U CN201921169741 U CN 201921169741U CN 210218110 U CN210218110 U CN 210218110U
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Abstract
The utility model discloses a high-efficiency three-claw vacuum pump, the claw type rotor profile is simple in composition and only consists of 4 curves, and the problem of large limitation in the selection of three-claw rotor design parameters is solved; the traditional arc of the claw top and the claw bottom is omitted, and an eccentric involute and an envelope curve thereof are introduced, so that the volumetric efficiency of the three-claw vacuum pump is remarkably improved; the elliptical arc is adopted at the claw tip, so that the leakage at the claw tip is improved, the abrasion of the claw tip is reduced, and the method has important significance for optimizing the performance of the claw type vacuum pump. Meanwhile, an axial exhaust port is designed by combining the rotor profile, so that gas in the cavity can be completely exhausted, gas over-compression is avoided, and the energy consumption of the claw type vacuum pump is effectively reduced.
Description
Technical Field
The utility model relates to a vacuum acquisition equipment field, in particular to efficient three-jaw formula vacuum pump.
Background
The claw vacuum pump realizes the processes of gas suction, compression and discharge by making the volume of a working cavity change periodically through the synchronous opposite-direction double-rotation movement of a pair of claw rotors meshed with each other; the dry type oil-free.
The claw rotor is used as a core component of the claw fluid machine, and the performance of the claw fluid machine, such as sealing performance, area utilization rate, working efficiency and service life, is directly affected by the design of the molded line. Patent CN100526608C proposes a straight-line circular-arc three-jaw rotor and its design method, in which the left-side rotor of the rotor is composed of cycloid, eccentric circular arc and line segment, and the right-side rotor is composed of cycloid, circular arc envelope and straight-line envelope. The design constraint conditions are more, and the rotor design process is complex. Patent CN108343605A proposes a three-jaw vacuum pump, in which the arc at the top of the left jaw of the three-jaw rotor is smoothly connected with the arc at the bottom of the jaw by a sine line, and the arc at the top of the right jaw of the three-jaw rotor is smoothly connected with the arc at the bottom of the jaw by an envelope line of the sine line, so as to expand the value range of the design parameters. However, the three-jaw vacuum pump has low volumetric efficiency, complex molded line composition and sharp points at the jaw tips, and the jaw tips have leakage and serious abrasion in the operation process of the jaw vacuum pump.
Disclosure of Invention
In order to solve the problem that above-mentioned three-jaw vacuum pump exists, simultaneously in order to richen the molded lines type of claw formula rotor, the utility model discloses in introducing the design of three-jaw rotor with eccentric involute and its envelope, save traditional claw top and claw end circular arc, combine oval arc and oval arc envelope to establish an eccentric involute type three-jaw rotor that is totally smooth to design corresponding gas vent, showing the volumetric efficiency who has improved the three-jaw vacuum pump, the leakage of claw point department has been improved, the wearing and tearing of claw point have been reduced, there is important meaning to the performance optimization of claw formula vacuum pump.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the high-efficiency three-claw vacuum pump comprises: the left claw type rotor, the right claw type rotor, the cavity and the exhaust end cover; the method is characterized in that: left profile line of left claw rotor about its rotation center O1With 120 ° central symmetry, i.e. left-claw rotor about its centre of rotation O1After rotating 120 degrees anticlockwise or clockwise, the rotary shaft is completely overlapped with the rotary shaft; one third of the left molded line of the left claw type rotor consists of 3 sections of curves, which are sequentially as follows in the clockwise direction: an eccentric involute envelope AB, a left claw tip elliptic arc BC and a left elliptic arc envelope CD;
right profile of right claw rotor about its center of rotation O2With 120 ° central symmetry, i.e. right-claw rotor about its centre of rotation O2After rotating 120 degrees anticlockwise or clockwise, the rotary shaft is completely overlapped with the rotary shaft; one third of the right molded line of the right claw type rotor consists of 3 sections of curves, which are sequentially in the anticlockwise direction: an eccentric involute ab, a right elliptic arc envelope bc and a right claw tip elliptic arc cd; the meshing condition of each section of curve of the left molded line of the left claw type rotor and the right molded line of the right claw type rotor in the synchronous opposite-direction double-rotation movement is as follows: the eccentric involute envelope AB is meshed with the eccentric involute AB, the left claw tip elliptic arc BC is meshed with the right claw tip elliptic arc envelope BC, and the left claw tip elliptic arc envelope CD is meshed with the right claw tip elliptic arc CD.
The high-efficiency three-claw vacuum pump comprises:
the equation for the eccentric involute ab on the right profile of the right claw rotor is:
in the formula: rbIs the base radius of involute, h is eccentricity, β is eccentric involuteThe rotation angles are respectively determined by the following formulas:
the equation of the eccentric involute envelope AB on the left profile of the left claw rotor is as follows:
where α is the first angle of rotation,
for the first intermediate variable, it is determined by the following equation:
the equation for the left claw tip elliptical arc BC on the left profile of the left claw rotor is:
wherein:
in the formula: gamma is a second rotation angle, m1Is the length of the arc length of the ellipse of the tip of the claw, n1The length of a short semi-axis of an elliptic arc with a claw tip;
the equation for the left elliptical arc envelope CD on the left profile of the left claw rotor is:
in the formula: theta is the third angle of rotation and,
is a second intermediate variable, determined by the following equation:
the equation for the right elliptical arc envelope bc on the right profile of the right claw rotor is:
in the formula: τ is a fourth rotation angle;
the equation for the right claw tip elliptical arc cd on the right profile of the right claw rotor is:
in the formula: ε is a fifth rotation angle;
the method comprises the following steps: r1The radius of the circle where the claw top is located; r3The radius of the circle where the claw bottom is located; r2＝(R1+R3) And/2 is the pitch circle radius.
A high-efficiency three-jaw claw vacuum pump, set up the gas vent on the exhaust end cap, the profile curve of gas vent includes: a bottom edge line EF, a right edge line FG, a left edge line GE, a left vertex E, a right vertex F and an upper vertex G; the bottom edge line EF is an eccentric involute, the right edge line FG is a straight line, and the left edge line GE is an arc.
The utility model has the advantages that:
① in the three-jaw rotor profile design, the traditional arc of jaw top and jaw bottom is saved, and the eccentric involute and the envelope curve thereof are introduced, thus solving the problem of large limitation in the selection of three-jaw rotor design parameters and obviously improving the volumetric efficiency of the three-jaw vacuum pump.
② the full-gloss slide rotor is constructed by adopting elliptical arc-shaped line at the claw tip, thus eliminating the original sharp point, improving the leakage at the claw tip and reducing the abrasion at the claw tip.
The ③ molded line is simple in composition and only consists of 4 curves, so that the three-jaw vacuum pump is convenient to optimally design.
Drawings
FIG. 1 is a view showing the structure of a three-jaw vacuum pump.
Fig. 2 is a left line drawing of the left claw rotor.
Fig. 3 is a right profile view of the right claw rotor.
FIG. 4 is a front view of the exhaust end cap.
Fig. 5 is a rotor profile mesh diagram.
FIG. 6 is a view showing the end of suction of the three-jaw vacuum pump.
Fig. 7 is a view showing the start moment of compression of the three-jaw vacuum pump.
Fig. 8 is a schematic view of the tip of the paw leaking during operation.
Fig. 9 is a view showing an exhaust start moment of the three-jaw vacuum pump.
Fig. 10 is a diagram of the three-jaw vacuum pump immediately before the end of evacuation.
In the figure, 1 is a left claw type rotor, 2 is a right claw type rotor, 3 is a cavity, 4 is an exhaust end cover, 101 is a left line, 201 is a right line, 301 is an air inlet, 401 is an exhaust port, α is a first rotation angle, gamma is a second rotation angle, theta is a third rotation angle, tau is a fourth rotation angle, and epsilon is a fifth rotation angle.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings and examples.
As shown in fig. 1, a 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 enters the cavity 3 through a radial air inlet 301 formed on the cavity 3, and the gas sucked in the cavity 3 is conveyed and compressed in equal volume along with the synchronous opposite-direction double-rotation motion of the left-jaw rotor 1 and the right-jaw rotor 2, and is axially discharged through an exhaust port 401 formed on the exhaust end cover 4 when the gas rotates to an exhaust port position.
As shown in fig. 2, which is a left line diagram of the left claw rotor, the left line 101 of the left claw rotor 1 is about the rotation center O thereof1With 120 ° central symmetry, i.e. left-claw rotor 1 about its centre of rotation O1After rotating 120 degrees anticlockwise or clockwise, the rotary shaft is completely overlapped with the rotary shaft; one third of the left line 101 of the left claw rotor 1 is composed of 3 sections of curves, which are sequentially in the clockwise direction: eccentric involute envelopeAB. Left paw tip elliptical arc BC, left elliptical arc envelope CD.
As shown in fig. 3, which is a right profile diagram of the right claw rotor, the right profile 201 of the right claw rotor 2 is about the rotation center O thereof2With 120 central symmetry, i.e. right-claw rotor 2 about its centre of rotation O2After rotating 120 degrees anticlockwise or clockwise, the rotary shaft is completely overlapped with the rotary shaft; one third of the right profile 201 of the right claw rotor 2 is composed of 3 segments of curves, which are in turn in the counterclockwise direction: an eccentric involute ab, a right elliptic arc envelope bc and a right claw tip elliptic arc cd.
As shown in fig. 4, in a front view of the exhaust end cover, an exhaust port 401 is opened in the exhaust end cover 4, and a contour curve of the exhaust port 401 includes: a bottom edge line EF, a right edge line FG, a left edge line GE, a left vertex E, a right vertex F and an upper vertex G; the bottom edge line EF is an eccentric involute, the right edge line FG is a straight line, and the left edge line GE is an arc.
As shown in fig. 5, in order to obtain a rotor profile meshing diagram, the meshing condition of each segment of curves of the left profile 101 of the left claw rotor 1 and the right profile 201 of the right claw rotor 2 in the synchronous and asynchronous double-rotation motion is as follows: the eccentric involute envelope AB is meshed with the eccentric involute AB, the left claw tip elliptic arc BC is meshed with the right claw tip elliptic arc envelope BC, and the left claw tip elliptic arc envelope CD is meshed with the right claw tip elliptic arc CD.
As shown in fig. 6, it is a diagram of the moment when the suction of the three-jaw vacuum pump is finished, and at this time, the volume chamber is no longer communicated with the suction port, and the constant volume conveying process is about to start.
As shown in fig. 7, the three-jaw vacuum pump compression start moment is shown, at which the constant-volume conveying process is finished and the compression process is about to start.
As shown in fig. 8, a schematic diagram of leakage from the claw tip during operation, at which time a leakage path exists at the moment of claw, tip engagement, the existence of the elliptical arc of the claw tip effectively reduces leakage at the claw tip.
As shown in fig. 9, it is a diagram of the exhaust start moment of the three-jaw vacuum pump, when a portion of the profile of the right jaw rotor coincides with the bottom edge line EF of the exhaust port, which marks the end of the compression process and is about to start the exhaust process.
As shown in fig. 10, when the exhaust of the three-jaw vacuum pump is about to end, the exhaust port is completely blocked when the rotor continues to rotate for a certain angle, and the exhaust process is ended.
Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.
Claims (3)
1. A high efficiency three-jaw vacuum pump comprising: the left claw type rotor (1), the right claw type rotor (2), a cavity (3) and an exhaust end cover (4); the method is characterized in that: the left line (101) of the left claw rotor (1) is about the rotation center O thereof1With 120-degree central symmetry, i.e. the left claw rotor (1) rotates around the center of rotation O1After rotating 120 degrees anticlockwise or clockwise, the rotary shaft is completely overlapped with the rotary shaft; one third of a left line (101) of the left claw type rotor (1) consists of 3 sections of curves, which are sequentially as follows in the clockwise direction: an eccentric involute envelope AB, a left claw tip elliptic arc BC and a left elliptic arc envelope CD;
the right profile (201) of the right claw rotor (2) is about its centre of rotation O2With 120-degree central symmetry, i.e. the right claw rotor (2) rotates around the center of rotation O2After rotating 120 degrees anticlockwise or clockwise, the rotary shaft is completely overlapped with the rotary shaft; one third of the right molded line (201) of the right claw type rotor (2) is composed of 3 sections of curves, and the curves are in turn in the anticlockwise direction: an eccentric involute ab, a right elliptic arc envelope bc and a right claw tip elliptic arc cd; the meshing condition of each section of curve of a left molded line (101) of the left claw type rotor (1) and a right molded line (201) of the right claw type rotor (2) in the synchronous and anisotropic double-rotation movement is as follows: the eccentric involute envelope AB is meshed with the eccentric involute AB, the left claw tip elliptic arc BC is meshed with the right claw tip elliptic arc envelope BC, and the left claw tip elliptic arc envelope CD is meshed with the right claw tip elliptic arc CD.
2. A high efficiency three-jaw vacuum pump as claimed in claim 1, wherein:
the equation of the eccentric involute ab on the right molded line (201) of the right claw type rotor (2) is as follows:
in the formula: rbIs the base radius of the involute, h is the eccentricity, β is the rotation angle of the eccentric involute, which is respectively determined by the following formula:
the equation of an eccentric involute envelope AB on a left line (101) of the left claw type rotor (1) is as follows:
where α is the first angle of rotation,
for the first intermediate variable, it is determined by the following equation:
the equation for the left claw tip elliptical arc BC on the left profile (101) of the left claw rotor (1) is:
wherein:
in the formula: gamma is a second rotation angle, m1Is the length of the arc length of the ellipse of the tip of the claw, n1The length of a short semi-axis of an elliptic arc with a claw tip;
the equation for the left elliptical arc envelope CD on the left profile (101) of the left claw rotor (1) is:
in the formula: theta is the third angle of rotation and,
is a second intermediate variable, determined by the following equation:
the equation for the right elliptical arc envelope bc on the right profile (201) of the right claw rotor (2) is:
in the formula: τ is a fourth rotation angle;
the equation of the right claw tip elliptic arc cd on the right molded line (201) of the right claw type rotor (2) is as follows:
in the formula: ε is a fifth rotation angle;
the method comprises the following steps: r1The radius of the circle where the claw top is located; r3The radius of the circle where the claw bottom is located; r2＝(R1+R3) And/2 is the pitch circle radius.
3. A high efficiency three-jaw vacuum pump as claimed in claim 1, wherein: 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 EF, a right edge line FG, a left edge line GE, a left vertex E, a right vertex F and an upper vertex G; the bottom edge line EF is an eccentric involute, the right edge line FG is a straight line, and the left edge line GE is an arc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921169741.7U CN210218110U (en) | 2019-07-24 | 2019-07-24 | Efficient three-jaw claw formula vacuum pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921169741.7U CN210218110U (en) | 2019-07-24 | 2019-07-24 | Efficient three-jaw claw formula vacuum pump |
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| Publication Number | Publication Date |
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| CN210218110U true CN210218110U (en) | 2020-03-31 |
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| CN201921169741.7U Active CN210218110U (en) | 2019-07-24 | 2019-07-24 | Efficient three-jaw claw formula vacuum pump |
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