CN212508818U - Two-stage compression sliding vane type vacuum pump driven by rotary ring - Google Patents

Abstract

The utility model discloses a two-stage compression sliding vane type vacuum pump driven by a swivel, which consists of a front end cover (1), a swivel cover (2), a swivel (3), a sliding vane (4), a cylinder (5) and a rear end cover (6); the outer cylinder line (513) and the inner cylinder line (514) are all smooth and have continuous curvature radii. Six cavities with different volumes are formed among the front end cover (1), the swivel cover (2), the swivel (3) and the cylinder (5), the volumes of the three cavities on the outer side of the swivel (3) are the same, and the volumes of the three cavities on the inner side of the swivel (3) are the same; the utility model discloses can increase the displacement, improve the interior volume ratio, reduce the clearance volume, improve the volume utilization ratio and the vacuum of vacuum pump, improve the gleitbretter atress condition.

Description

Two-stage compression sliding vane type vacuum pump driven by rotary ring

Technical Field

The utility model belongs to the vacuum pump field, specifically speaking relates to a change driven two-stage compression sliding vane type vacuum pump.

Background

The sliding vane vacuum pump is a positive displacement fluid machine, and the sliding vane continuously operates in a pump cavity to suck and compress air from an air suction port and finally discharge the air from an air exhaust port; the pump has the advantages of large pumping speed, small volume and capability of sucking impurity-containing gas, and is widely applied to the industries of metallurgy, electronics, medicine and automobiles; the key technology is that the shape of the inner cavity of the pump cavity directly influences the working performance of the vacuum pump. The common sliding vane vacuum pump has a single-cavity or double-cavity working cavity, and has small exhaust volume and internal volume and low ultimate vacuum degree.

With the increase of the application neighborhood of the vacuum pump, the requirement on the vacuum degree of the vacuum pump is also improved, and the concentric double-wave ring multi-sliding-vane rotor machine provided in the patent with the publication number of CN 277724 adopts a cavity molded line constructed by a cosine function curve, and divides an inner cavity and an outer cavity through a rotating ring to realize a two-stage structure, thereby increasing the flow rate of liquid which can be conveyed and improving the stress condition of the sliding vane; but the change amplitude of the line radial is small, which is not beneficial to increasing the internal volume ratio; there is relative motion between driving plate and the apron, increases to let out leakage quantity.

Disclosure of Invention

The utility model discloses an increase interior volume ratio, and then increase ultimate vacuum and displacement, simultaneously in order to improve the leakage condition to and richen the type of sliding vane vacuum pump cylinder end face molded lines, provided a change driven two-stage compression sliding vane vacuum pump. The outer side cylinder molded line (513) and the inner side cylinder molded line (514) are constructed by adopting sine and cosine function curves with different phases and different orders, the size of parameters can be adjusted according to design conditions, the cylinder is divided into an inner part and an outer part through a rotating ring, two-stage structural design is realized, compressed gas enters a secondary working chamber after primary compression is completed, and therefore the purposes of improving the internal volume ratio, the compression ratio and the limit vacuum degree are achieved, and meanwhile, the exhaust volume is improved by using three-chamber design for each stage. The outer cylinder molded line (513) and the inner cylinder molded line (514) only have a constant coefficient difference on a polar coordinate equation, and any position on the outer cylinder molded line (513) and the inner cylinder molded line (514) is continuous and smooth, so that the characteristic requirements of continuous smooth first-order derivatives and continuous second-order derivatives of the cylinder molded lines are met. The sliding sheet has no rigid impact and soft impact in the sliding groove direction, so that the self stress condition is favorably improved, the vibration of the sliding sheet and the impact on the inner wall of the air cylinder are inhibited, and the stable and reliable operation of the sliding sheet is ensured.

The utility model provides a technical scheme that its technical problem adopted is:

a rotary ring driven two stage compression sliding vane vacuum pump comprising: front end housing (1), swivel lid (2), swivel (3), gleitbretter (4), cylinder (5) and rear end cap (6), characterized by: front end housing (1) on seted up 3 exhaust holes, respectively be: a second-stage first exhaust hole (101), a second-stage second exhaust hole (102) and a second-stage third exhaust hole (103); 3 suction holes, which are respectively: a first-stage first air suction hole (104), a first-stage second air suction hole (105) and a first-stage third air suction hole (106); the swivel cover (2) is provided with 3 exhaust channels which are a first exhaust channel (201), a second exhaust channel (202) and a third exhaust channel (203); rear end cap (6) on seted up 3 exhaust holes, respectively be: a first-stage first exhaust hole (601), a first-stage second exhaust hole (602) and a first-stage third exhaust hole (603); 3 suction holes, which are respectively: any two adjacent suction and exhaust holes are the same in shape and have a phase angle difference of 120 degrees; m centripetal sliding grooves are symmetrically formed in the rotating ring (3), wherein m is the number, m is more than or equal to 6 and less than or equal to 12, and a sliding sheet (4) is assembled in each sliding groove;

six cavities are formed among the front end cover (1), the rotating ring cover (2), the rotating ring (3) and the air cylinder (5), the axial projections of the six cavities are all crescent-shaped, wherein the volumes of three cavities outside the rotating ring (3) are the same, namely a first-level first cavity (501), a second-level cavity (502) and a third-level cavity (503), the volumes of three cavities inside the rotating ring (3) are the same, namely a second-level first cavity (504), a second-level second cavity (505) and a second-level third cavity (506), and the volumes of the first-level cavities are all larger than those of the second-level cavities; the six cavities are divided into 2m working cavities with different volumes by m sliding sheets (4); the minimum sealed working cavity of any one stage of cavity is larger than the maximum sealed working cavity of the second stage of cavity;

in the working process, pumped gas respectively enters three primary cavities through three primary air suction ports on the front end cover (1) to realize an air suction process, and after being compressed in the primary cavities, the pumped gas is discharged from three primary air exhaust ports on the cylinder (5) to complete a primary compression process; then the gas enters a secondary cavity (302) through a secondary suction port of the connecting pipe, and after the gas is compressed again, the pumped gas enters a secondary exhaust port on the front end cover (1) through three exhaust channels on the rotating ring cover (2) to be exhausted, so that the secondary compression process is completed; thereby achieving two-stage compression of the gas.

A two-stage compression sliding vane vacuum pump driven by a rotating ring is characterized in that: the outer cylinder line (513) and the inner cylinder line (514) on the cylinder (5) are only composed of one analytical curve, the cylinder lines are all smooth, the curvature radius at any point is continuous, and n-step conduction is realized (n is 1,2,3 …);

a polar coordinate system is established by taking the rotation center of the cylinder (5) as a coordinate origin O, and the equation of the inner cylinder profile (514) is as follows:

the equation for the outside cylinder profile (513) is:

wherein rho is the radial diameter of the cylinder profile in mm;

R₁-radius of inscribed circle of internal line of cylinder, mm;

R₂-radius of circumscribed circle of internal line of cylinder, mm;

l-elongation coefficient, slide length, mm.

A two-stage compression sliding vane vacuum pump driven by a rotating ring is characterized in that: the cylinder (5) is provided with 6 positioning points on the inner side cylinder molded line (514): first point A₁The second point B₁A third point C₁Fourth point D₁Fifth point E₁Sixth point F₁Wherein the second point B₁Fourth point D₁Sixth point F₁And a radius of R₁The inscribed circle of the circle is tangent and is the closest point to the rotation central point O; first point A₁A third point C₁Fifth point E₁And a radius of R₂The circumscribed circle of (a) is tangent and is the point farthest from the rotation center point O; there are also 6 anchor points on the outside cylinder profile (513) on the cylinder (5): first point A₂The second point B₂A third point C₂Fourth point D₂Fifth point E₂Sixth point F₂The radii of the inscribed circle and the circumscribed circle are respectively as follows: r₁+ l and R₂+l。

A two-stage compression sliding vane vacuum pump driven by a rotating ring is characterized in that: in the working process, the claw of the rotating ring (3) is arranged in the groove of the rotating ring cover (2), the rotating ring (3) is nested in the air cylinder (5), the front end cover (1) and the rear end cover (6) are assembled on the axial side of the air cylinder (3) and are coaxial with the rotating ring cover, and m sliding sheets (4) are arranged in m sliding grooves of the rotating ring (3); the motor drives the rotating ring cover (2) to drive the rotating ring (3), so that the sliding sheet (4) on the rotating ring moves in the cylinder (5) to form a variable working cavity.

A two-stage compression sliding vane vacuum pump driven by a rotating ring is characterized in that: the rotary ring cover (2) is provided with three air suction channels which are identical in shape and size and have a phase angle difference of 120 degrees between adjacent phase angles: the air exhaust device comprises a first air exhaust channel (201), a second air exhaust channel (202) and a third air exhaust channel (203), wherein the axial projection of any air exhaust channel is tangent to one sliding vane, and when a minimum closed working cavity is formed, the air exhaust channel is connected with three air exhaust holes in a front end cover (1), so that the air exhaust process is realized;

the exhaust hole on the front end cover (1): a second-stage first exhaust hole (101), a second-stage second exhaust hole (102) and a second-stage third exhaust hole (103); and one of the sliding sheets is tangent with the edge profile of the second-stage first exhaust hole (101) when the minimum closed working cavity in the second-stage first cavity body (504) is formed; one sliding vane is tangent to the edge profile of the secondary second exhaust hole (102) when the smallest closed working cavity in the secondary second cavity (505) is formed; when the minimum closed working cavity in the secondary third cavity (506) is formed, one sliding sheet is tangent to the edge profile of the secondary third exhaust hole (103);

the air suction hole on the front end cover (1): a first-stage first air suction hole (104), a first-stage second air suction hole (105) and a first-stage third air suction hole (106); and when the largest closed working cavity in the primary first cavity body (501) is formed, one of the sliding sheets is tangent to the edge profile of the primary first air suction hole (104); when the largest closed working cavity in the primary second cavity body (502) is arranged, one sliding vane is tangent to the edge profile of the primary second suction hole (105); when the largest closed working cavity in the primary third cavity (503) is arranged, one sliding vane is tangent to the edge profile of the primary third suction hole (106);

the exhaust holes on the rear end cover (6): a first-stage first exhaust hole (601), a first-stage second exhaust hole (602) and a first-stage third exhaust hole (603); and one of the sliding sheets is tangent to the edge profile of the first-stage exhaust hole (601) when the minimum closed working cavity in the first-stage cavity body (501) is formed; one sliding vane is tangent to the edge profile of the first-stage second exhaust hole (602) when a minimum closed working cavity in the first-stage second cavity body (502) is formed; one sliding vane is tangent to the edge profile of the first-stage third suction hole (106) when a minimum closed working cavity in the first-stage third cavity (503) is formed;

the air suction hole on the rear end cover (6): a second-stage first suction hole (604), a second-stage second suction hole (605), and a second-stage third suction hole (606); and one of the sliding pieces is tangent to the edge profile of the secondary first air suction hole (604) when the largest closed working cavity in the secondary first cavity body (504) is formed; one sliding vane is tangent to the edge profile of the second-stage second suction hole (605) when the largest closed working cavity in the second-stage second cavity body (505) is formed; one of the sliding pieces is tangent with the edge profile of the second-stage third suction hole (606) when the largest closed working cavity in the second-stage third cavity (506) is formed.

The utility model has the advantages that:

the two-stage compression sliding vane type vacuum pump driven by the rotary ring can realize two-stage compression, so that the internal volume ratio is improved, and the compression ratio and the ultimate vacuum degree of the vacuum pump are further improved.

Secondly, the two-stage compression sliding vane type vacuum pump driven by the rotary ring adopts a multi-cavity structure, so that the volume of a working cavity can be increased, and further, the exhaust volume is improved.

The two-stage compression sliding vane type vacuum pump driven by the rotary ring has continuous first derivative and continuous second derivative, and two ends of the sliding vane (4) are always in contact with the air cylinder (5), so that the phenomenon of void does not exist, the stress condition of the sliding vane is favorably improved, the impact is reduced, and the abrasion of the sliding vane is reduced.

The molded line of the two-stage compression sliding vane type vacuum pump driven by the rotating ring enriches the types of the molded lines of the sliding vane type vacuum pump.

Drawings

FIG. 1 is a three-dimensional assembly diagram of a two-stage compression sliding vane vacuum pump driven by a rotating ring.

Fig. 2 is a line drawing of the cavity of the cylinder (5).

Fig. 3 is an axial two-dimensional assembly drawing of the cylinder (5), the swivel (3) and the slide (4).

Fig. 4 is a graph of maximum inspiratory volume during a stage of inspiration.

FIG. 5 is a graph of exhaust volume during a first stage of exhaust.

Fig. 6 is a graph of maximum inspiratory volume during two-stage inspiration.

FIG. 7 is a graph of exhaust volume during a two-stage exhaust.

Fig. 8 is a view showing the opening position of the air intake/exhaust port of the front end cover (1).

Fig. 9 is a view showing the opening position of the air intake/exhaust port of the rear end cap (6).

Fig. 10 is a three-dimensional view of the swivel (3).

Fig. 11 is a bottom view of the swivel cover (2).

Fig. 12 is a front view of the swivel cover (2).

In the figure: 1-front end cover; 2-rotating ring cover; 3, rotating; 4-sliding sheet; 5, a cylinder; 6-rear end cap; 501-first-stage first cavity; 513-outside cylinder profile; 514-inside cylinder profile; r₁-pump cavity profile inscribed circle radius; r₂-pump cavity profile circumscribed circle radius; alpha-the central angle of the complex function curve; beta-the central angle of the transition curve; 101-two-stage first exhaust hole; 102-secondary second vent; 103-second level third vent; 104-primary first air suction holes; 105-a primary second suction hole; 106-a first-stage third suction hole; 601-first stage exhaust hole; 602-a primary second vent; 603-first-stage third exhaust holes; 604 — secondary first suction holes; 605-second stage second suction hole; 606-second order third suction holes; 201-first exhaust channel (201), 202-second exhaust channel (202), 203-third exhaust channel (203).

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

As shown in fig. 1, a three-dimensional assembly diagram of a two-stage compression sliding vane vacuum pump driven by a rotating ring comprises: the rotary slip-sheet type air cylinder comprises a front end cover (1), a rotary ring cover (2), a rotary ring (3), a slip sheet (4), an air cylinder (5) and a rear end cover (6).

As shown in fig. 2, a profile of an inner cavity of a two-stage compression sliding vane vacuum pump driven by a swivel ring is formed as follows: a polar coordinate system is established by taking the rotation center of the cylinder (5) as a coordinate origin O, and the equation of the inner cylinder profile (514) is as follows:

the equation for the outside cylinder profile (513) is:

wherein rho is the radial diameter of the cylinder profile in mm;

R₁-radius of inscribed circle of internal line of cylinder, mm;

R₂-radius of circumscribed circle of internal line of cylinder, mm;

l-elongation coefficient, slide length, mm;

there are 6 anchor points on the inside cylinder line (514) on the cylinder (5): first point A₁The second point B₁A third point C₁Fourth point D₁Fifth point E₁Sixth point F₁Wherein the second point B₁Fourth point D₁Sixth point F₁And a radius of R₁The inscribed circle of the circle is tangent and is the closest point to the rotation central point O; first point A₁A third point C₁Fifth point E₁And a radius of R₂The circumscribed circle of (a) is tangent and is the point farthest from the rotation center point O; there are also 6 anchor points on the outside cylinder profile (513) on the cylinder (5): first point A₂The second point B₂A third point C₂Fourth point D₂Fifth point E₂Sixth point F₂The radii of the inscribed circle and the circumscribed circle are respectively as follows: r₁+ l and R₂+l。

As shown in fig. 3, an axial two-dimensional assembly diagram of a two-stage compression sliding vane vacuum pump driven by a swivel is shown, six cavities are formed among a front end cover (1), a swivel cover (2), a swivel (3) and a cylinder (5), and axial projections of the six cavities are all crescent-shaped, wherein the volumes of three cavities outside the swivel (3) are the same, namely a first-stage first cavity (501), a second-stage second cavity (502) and a third-stage cavity (503), the volumes of three cavities inside the swivel (3) are the same, namely a second-stage first cavity (504), a second-stage second cavity (505) and a second-stage third cavity (506), and the volumes of the first-stage cavities are all larger than the volumes of the second-stage cavities; the six cavities are divided into 2m working cavities with different volumes by m sliding sheets (4); and the minimum closed working cavity of any one stage of cavity is larger than the maximum closed working cavity of the second stage of cavity.

As shown in figure 4, the maximum suction volume in the primary suction process is shown, and the maximum closed working cavity S in the primary first cavity (501) is formed_1-1maxOne of the sliding sheets and the first stageThe edge profile of the suction hole (104) is tangent; the largest closed working cavity S in the primary second cavity body (502)_1-2maxOne of the sliding pieces is tangent to the edge contour of the first-stage second suction hole (105); the largest closed working cavity S in the primary third cavity (503)_1-3maxOne of the sliding pieces is tangent to the edge profile of the first-stage third suction hole (106);

as shown in fig. 5, it is a graph of exhaust volume in the primary exhaust process, and the minimum closed working chamber S in the primary first chamber (501) is formed_1-1minOne of the sliding pieces is tangent to the edge profile of the first-stage exhaust hole (601); forming a minimum closed working cavity S in the primary second cavity body (502)_1-2minOne sliding sheet is tangent to the edge profile of the first-stage second exhaust hole (602); forming a minimum closed working cavity S in the primary third cavity (503)_1-3minOne of the sliding pieces is tangent to the edge profile of the first-stage third suction hole (106);

as shown in FIG. 6, the maximum suction volume during the second suction is shown as the maximum enclosed working chamber S in the first chamber (504) forming the second stage_2-1maxOne of the sliding pieces is tangent to the edge profile of the secondary first air suction hole (604); the largest closed working cavity S in the second-stage cavity (505)_2-2maxOne of the sliding pieces is tangent to the edge contour of the second-stage suction hole (605); the largest closed working cavity S in the second-stage third cavity (506)_2-3maxOne of the vanes is tangent to the edge profile of the second-stage third suction hole (606).

As shown in FIG. 7, the volume of exhaust gas in the two-stage exhaust process is shown as the smallest enclosed working chamber S in the first chamber (504) forming the second stage_2-1minOne of the sliding sheets is tangent to the edge profile of the second-stage first exhaust hole (101); the smallest enclosed working cavity S in the second cavity (505) of the second stage_2-2minOne sliding sheet is tangent to the edge profile of the secondary second exhaust hole (102); the smallest enclosed working cavity S in the second-stage third cavity (506)_2-3minOne sliding sheet is tangent to the edge profile of the second-stage third exhaust hole (103).

As shown in fig. 8, the opening position of the air intake and exhaust port of the front end cover (1) is shown, and 3 exhaust holes are provided on the front end cover (1), which are respectively: a second-stage first exhaust hole (101), a second-stage second exhaust hole (102) and a second-stage third exhaust hole (103); 3 suction holes, which are respectively: any two adjacent suction and exhaust holes have the same shape and the phase angle is 120 degrees different from each other.

As shown in fig. 9, which is a drawing of the opening position of the air suction and exhaust port of the rear end cover (6), the rear end cover (6) is provided with 3 exhaust holes, which are respectively: a first-stage first exhaust hole (601), a first-stage second exhaust hole (602) and a first-stage third exhaust hole (603); 3 suction holes, which are respectively: any two adjacent suction and exhaust holes have the same shape and the phase angle is 120 degrees different from each other.

As shown in fig. 10, which is a three-dimensional view of the swivel (3), m centripetal sliding grooves are symmetrically formed in the swivel (3), wherein m is the number, m is greater than or equal to 6 and less than or equal to 12, and a sliding vane (4) is assembled in each sliding groove; the upper end of the rotary ring (3) is provided with three claws which are evenly distributed and are used for matching with the rotary ring cover (2).

As shown in fig. 11, which is a bottom view of the swivel cover (2), three air suction channels having the same shape and size and a phase angle difference of 120 ° are provided on the swivel cover (2): the air exhaust device comprises a first air exhaust channel (201), a second air exhaust channel (202) and a third air exhaust channel (203), wherein the axial projection of any air exhaust channel is tangent to one sliding sheet, and when a minimum closed working cavity is formed, the air exhaust channel is connected with three air exhaust holes in a front end cover (1), so that the air exhaust process is realized.

As shown in fig. 12, the shaft on the rotating ring cover (2) can be directly connected with the motor to realize driving, which is a front view of the rotating ring cover (2).

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 (5)

1. A rotary ring driven two stage compression sliding vane vacuum pump comprising: front end housing (1), swivel lid (2), swivel (3), gleitbretter (4), cylinder (5) and rear end cap (6), characterized by: front end housing (1) on seted up 3 exhaust holes, respectively be: a second-stage first exhaust hole (101), a second-stage second exhaust hole (102) and a second-stage third exhaust hole (103); 3 suction holes, which are respectively: a first-stage first air suction hole (104), a first-stage second air suction hole (105) and a first-stage third air suction hole (106); the swivel cover (2) is provided with 3 exhaust channels which are a first exhaust channel (201), a second exhaust channel (202) and a third exhaust channel (203); rear end cap (6) on seted up 3 exhaust holes, respectively be: a first-stage first exhaust hole (601), a first-stage second exhaust hole (602) and a first-stage third exhaust hole (603); 3 suction holes, which are respectively: any two adjacent suction and exhaust holes are the same in shape and have a phase angle difference of 120 degrees; m centripetal sliding grooves are symmetrically formed in the rotating ring (3), wherein m is the number, m is more than or equal to 6 and less than or equal to 12, and a sliding sheet (4) is assembled in each sliding groove;

six cavities are formed among the front end cover (1), the rotating ring cover (2), the rotating ring (3) and the air cylinder (5), the axial projections of the six cavities are all crescent-shaped, wherein the volumes of three cavities outside the rotating ring (3) are the same, namely a first-level first cavity (501), a second-level cavity (502) and a third-level cavity (503), the volumes of three cavities inside the rotating ring (3) are the same, namely a second-level first cavity (504), a second-level second cavity (505) and a second-level third cavity (506), and the volumes of the first-level cavities are all larger than those of the second-level cavities; the six cavities are divided into 2m working cavities with different volumes by m sliding sheets (4); the minimum closed working cavity of any one stage of cavity is larger than the maximum closed working cavity in the second stage of cavity;

in the working process, pumped gas respectively enters three primary cavities through three primary air suction ports on the front end cover (1) to realize an air suction process, and after being compressed in the primary cavities, the pumped gas is discharged from three primary air exhaust ports on the cylinder (5) to complete a primary compression process; then the gas enters a secondary cavity (302) through a secondary suction port of the connecting pipe, and after the gas is compressed again, the pumped gas enters a secondary exhaust port on the front end cover (1) through three exhaust channels on the rotating ring cover (2) to be exhausted, so that the secondary compression process is completed; thereby achieving two-stage compression of the gas.

2. A rotary ring driven two stage compression sliding vane vacuum pump as claimed in claim 1, wherein: the outer cylinder line (513) and the inner cylinder line (514) on the cylinder (5) are only composed of one analytical curve, the cylinder lines are all smooth, the curvature radius at any point is continuous, and n-step conduction is realized (n is 1,2,3 …);

a polar coordinate system is established by taking the rotation center of the cylinder (5) as a coordinate origin O, and the equation of the inner cylinder profile (514) is as follows:

the equation for the outside cylinder profile (513) is:

wherein rho is the radial diameter of the cylinder profile in mm;

R₁-radius of inscribed circle of internal line of cylinder, mm;

R₂-radius of circumscribed circle of internal line of cylinder, mm;

l-elongation coefficient, slide length, mm.

3. A rotary ring driven two stage compression sliding vane vacuum pump as claimed in claim 1, wherein: the cylinder (5) is provided with 6 positioning points on the inner side cylinder molded line (514): first point A₁The second point B₁A third point C₁Fourth point D₁Fifth point E₁Sixth point F₁Wherein the second point B₁Fourth point D₁Sixth, aPoint F₁And a radius of R₁The inscribed circle of the circle is tangent and is the closest point to the rotation central point O; first point A₁A third point C₁Fifth point E₁And a radius of R₂The circumscribed circle of (a) is tangent and is the point farthest from the rotation center point O; there are also 6 anchor points on the outside cylinder profile (513) on the cylinder (5): first point A₂The second point B₂A third point C₂Fourth point D₂Fifth point E₂Sixth point F₂The radii of the inscribed circle and the circumscribed circle are respectively as follows: r₁+ l and R₂+l。

4. A rotary ring driven two stage compression sliding vane vacuum pump as claimed in claim 1, wherein: in the working process, the claw of the rotating ring (3) is arranged in the groove of the rotating ring cover (2), the rotating ring (3) is nested in the air cylinder (5), the front end cover (1) and the rear end cover (6) are assembled on the axial side of the air cylinder (5) and are coaxial with the rotating ring cover, and m sliding sheets (4) are arranged in m sliding grooves of the rotating ring (3); the motor drives the rotating ring cover (2) to drive the rotating ring (3), so that the sliding sheet (4) on the rotating ring moves in the cylinder (5) to form a variable working cavity.

5. A rotary ring driven two stage compression sliding vane vacuum pump as claimed in claim 1, wherein: the rotary ring cover (2) is provided with three exhaust channels which are identical in shape and size and have a phase angle difference of 120 degrees between adjacent phase angles: the air exhaust device comprises a first air exhaust channel (201), a second air exhaust channel (202) and a third air exhaust channel (203), wherein the axial projection of any air exhaust channel is tangent to one sliding vane, and when a minimum closed working cavity is formed, the air exhaust channel is connected with three air exhaust holes in a front end cover (1), so that the air exhaust process is realized;

the exhaust hole on the front end cover (1): a second-stage first exhaust hole (101), a second-stage second exhaust hole (102) and a second-stage third exhaust hole (103); and one of the sliding sheets is tangent with the edge profile of the second-stage first exhaust hole (101) when the minimum closed working cavity in the second-stage first cavity body (504) is formed; one sliding vane is tangent to the edge profile of the secondary second exhaust hole (102) when the smallest closed working cavity in the secondary second cavity (505) is formed; when the minimum closed working cavity in the secondary third cavity (506) is formed, one sliding sheet is tangent to the edge profile of the secondary third exhaust hole (103);

the air suction hole on the front end cover (1): a first-stage first air suction hole (104), a first-stage second air suction hole (105) and a first-stage third air suction hole (106); and when the largest closed working cavity in the primary first cavity body (501) is formed, one of the sliding sheets is tangent to the edge profile of the primary first air suction hole (104); when the largest closed working cavity in the primary second cavity body (502) is arranged, one sliding vane is tangent to the edge profile of the primary second suction hole (105); when the largest closed working cavity in the primary third cavity (503) is arranged, one sliding vane is tangent to the edge profile of the primary third suction hole (106);

the exhaust holes on the rear end cover (6): a first-stage first exhaust hole (601), a first-stage second exhaust hole (602) and a first-stage third exhaust hole (603); and one of the sliding sheets is tangent to the edge profile of the first-stage exhaust hole (601) when the minimum closed working cavity in the first-stage cavity body (501) is formed; one sliding vane is tangent to the edge profile of the first-stage second exhaust hole (602) when a minimum closed working cavity in the first-stage second cavity body (502) is formed; one sliding vane is tangent to the edge profile of the first-stage third suction hole (106) when a minimum closed working cavity in the first-stage third cavity (503) is formed;

the air suction hole on the rear end cover (6): a second-stage first suction hole (604), a second-stage second suction hole (605), and a second-stage third suction hole (606); and one of the sliding pieces is tangent to the edge profile of the secondary first air suction hole (604) when the largest closed working cavity in the secondary first cavity body (504) is formed; one sliding vane is tangent to the edge profile of the second-stage second suction hole (605) when the largest closed working cavity in the second-stage second cavity body (505) is formed; one of the sliding pieces is tangent with the edge profile of the second-stage third suction hole (606) when the largest closed working cavity in the second-stage third cavity (506) is formed.

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