CN208380864U - A kind of two-chamber sliding vane vacuum pump cylinder body - Google Patents

Abstract

The utility model discloses a kind of two-chamber sliding vane vacuum pump cylinder bodies, cylinder shaped conductor is constituted using sinusoidal spiral line, first suction casing curve and the second suction casing curve, the first discharge section curve and the second discharge section curve are rotating around origin central symmetry, it is completely smooth connection between constituent curve and second dervative is continuous, the size of the corresponding central angle of first suction casing curve is α, the size of the corresponding central angle of first discharge section curve is β, α < β and alpha+beta=180 °；Two identical asymmetric working chambers are formed between cylinder body and rotor: the first working chamber and the second working chamber reduce delivery space, increase effectively interior volume specific ratio；The two-chamber sliding vane vacuum pump cylinder body of the utility model guarantees that in the sliding being kept in contact with inboard wall of cylinder block rigid shock and soft impulse do not occur for slide plate top, and central angle size can be corresponded to increase sliding vane vacuum pump interior volume specific ratio by change curve, make sliding vane vacuum pump that there is biggish final vacuum.

Description

A kind of two-chamber sliding vane vacuum pump cylinder body

Technical field

The utility model relates to sliding vane vacuum pumps, in particular to are suitable for a kind of two-chamber sliding vane vacuum pump cylinder body.

Background technique

Sliding vane vacuum pump is a kind of volume fluid machine, keeps slide plate top and inboard wall of cylinder block by centrifugal force when rotation Contact, rotor drive slide plate to slide along inboard wall of cylinder block, form closed working chamber between upper and lower end cap, slide plate, rotor and cylinder body, Realize the sucking of gas, compression and discharge.Have the advantages that pumping speed it is big, it is small in size, a certain amount of condensable gas can be extracted, extensively It is general to be applied to machinery, electronics, chemical industry, automobile and other industries.Common sliding vane vacuum pump includes single-chamber, two-chamber and three chamber slide plate vacuum Pump, to obtain better working performance, the design of cylinder shaped conductor is particularly important.Correlative study proposes multiple function molded line, three Angle function molded line and multistage build-up curve etc., but each working chamber of corresponding cylinder body is symmetrical structure, and delivery space is larger, leads Cause interior volume specific ratio small, compression efficiency is low.

Summary of the invention

In order to increase sliding vane vacuum pump interior volume specific ratio, also for the type of abundant cylinder shaped conductor, the utility model proposes A kind of two-chamber sliding vane vacuum pump cylinder body.Cylinder shaped conductor is constructed using sinusoidal spiral line, changes sucking and the corresponding circle of discharge section curve The accounting at heart angle reaches and forms two identical asymmetric working chambers between cylinder body and rotor, reduces delivery space, increase content The purpose of product ratio.It is continuous to meet second dervative for all curves on cylinder shaped conductor, guarantees that slide plate top connects with inboard wall of cylinder block holding Rigid shock and soft impulse does not occur in the sliding of touching.

To achieve the goals above, the utility model adopts the following technical solution:

A kind of two-chamber sliding vane vacuum pump cylinder body, the molded line in cylinder body (1) are distributed successively in the direction of the clock are as follows: the first sucking Section curve AB, the first discharge section curve BC, the discharge section curve DA of the second suction casing curve CD and second, between constituent curve completely It is smoothly connected and second dervative is continuous；A point and C point are the minimum point that slide plate can reach, and are located at using origin O as the center of circle, radius is Bottom radius of circle R₃Circle on；B point and D point are the highest point that slide plate can reach, and are located at using origin O as the center of circle, and radius is tip circle half Diameter R₁Circle on；The size of the corresponding central angle ∠ AOB of first suction casing curve AB is α, and the first discharge section curve BC is corresponding The size of central angle ∠ BOC is β, α < β and alpha+beta=180 °；First suction casing curve AB and the second suction casing curve CD are around origin O Central symmetry, the first discharge section curve BC and the second discharge section curve DA are around origin O central symmetry；Cylinder body (1) and rotor (2) it Between form two identical asymmetric working chambers: the first working chamber (101) and the second working chamber (102).

A kind of two-chamber sliding vane vacuum pump cylinder body, the equation of the first suction casing curve AB are as follows:

The equation of first discharge section curve BC are as follows:

The curvature of the first suction casing curve AB meets k simultaneously_AB> 0,

In formula: t is parameter.

The utility model has the following beneficial effects:

(1) asymmetric work cavity configuration improves the interior volume specific ratio of sliding vane vacuum pump, and vacuum pump is made to have the biggish limit true Reciprocal of duty cycle；

(2) it can be achieved to correspond to central angle by change curve to adjust sliding vane vacuum pump interior volume specific ratio；

(3) cylinder body constituent curve meets that second dervative is continuous, guarantees slide plate top in the cunning being kept in contact with inboard wall of cylinder block Rigid shock and soft impulse does not occur in dynamic；

(4) two-chamber sliding vane vacuum pump cylinder shaped conductor type is enriched.

Detailed description of the invention

Fig. 1 is two-chamber sliding vane vacuum pump cylinder line chart.

Fig. 2 is the corresponding cylinder line chart of curve difference central angle.

Fig. 3 is asymmetric working chamber figure.

Fig. 4 is that working chamber breathing process terminates, and compression process starts figure.

Fig. 5 is that working chamber compression process terminates, and exhaust process starts figure.

In figure:

R₁- tip circle radius；R₃- bottom radius of circle；α-central angle ∠ AOB size；β-central angle ∠ BOC size； 1-cylinder body；101-the first working chamber；102-the second working chamber；2-rotors；3-air entries；4-exhaust outlets；5-the first is sliding Piece；6-the second slide plate；S_in- maximum aspirated volume；S_out- maximum delivery space；ω-angular velocity of rotation.

Specific embodiment

The utility model is described in further detail with reference to the accompanying drawing.

As shown in Figure 1, the molded line in cylinder body (1) is distributed successively in the direction of the clock are as follows: the first suction casing curve AB, first Section curve BC, the second suction casing curve CD and the second discharge section curve DA is discharged, is completely smooth connection and two between constituent curve Order derivative is continuous；A point and C point are the minimum point that slide plate can reach, and are located at using origin O as the center of circle, and radius is bottom radius of circle R₃'s On circle；B point and D point are the highest point that slide plate can reach, and are located at using origin O as the center of circle, and radius is tip circle radius R₁Circle on；The The size of the corresponding central angle ∠ AOB of one suction casing curve AB is α, the corresponding central angle ∠ BOC's of the first discharge section curve BC Size is β, α < β and alpha+beta=180 °；First suction casing curve AB and the second suction casing curve CD is around origin O central symmetry, and first The discharge of section curve BC and second section curve DA is discharged around origin O central symmetry；The equation of first suction casing curve AB are as follows:

The equation of first discharge section curve BC are as follows:

In formula: t is parameter.

As shown in Fig. 2, the size β of size α and central angle the ∠ BOC of central angle ∠ AOB can be adjusted under the above conditions, When the difference of the size β of size α and central angle the ∠ BOC of central angle ∠ AOB is excessive, the first suction casing curve AB is near A point Curvature of curve less than zero, there is interior convex-segment in curve, cause slide plate to contact with inboard wall of cylinder block and fall off, and at this slide plate with Cylinder body serious wear, therefore the size β of size α and central angle the ∠ BOC of central angle ∠ AOB wants reasonable value, guarantees that first inhales Enter the curvature k of section curve AB_AB> 0,

The difference of the size β of size α and central angle the ∠ BOC of central angle ∠ AOB is bigger, and the first suction casing curve AB is steeper High and steep, the first discharge section curve BC is gentler, and the interior volume specific ratio of sliding vane vacuum pump is bigger；Difference is smaller, the first suction casing curve AB Gentler, the first discharge section curve BC is more precipitous, and the interior volume specific ratio of sliding vane vacuum pump is smaller, as α=β, institute as dashed lines Show, the discharge of the first suction casing curve AB and first section curve BC is symmetrical about the longitudinal axis.

As shown in figure 3, forming two identical asymmetric working chambers: the first working chamber between cylinder body (1) and rotor (2) (101) and the second working chamber (102) it is symmetrical, to be not in relation to the longitudinal axis.

As shown in figure 4, rotor (2), at current location, the first slide plate (5) is located at air entry (3) end, working chamber air-breathing Process terminates, and compression process starts, and such as shade is formed between cylinder body (1), rotor (2), the first slide plate (5) and the second slide plate (6) Maximum aspirated volume S shown in part_in。

As shown in figure 5, the second slide plate (6) is located at exhaust outlet (4) initial end when rotor (2) moves clockwise to current location, Working chamber compression process terminates, and exhaust process starts, between cylinder body (1), rotor (2), the first slide plate (5) and the second slide plate (6) Form maximum delivery space S as shown by the shaded portion_out；Dotted line show the common cylinder with symmetrical working chamber in figure Line, the maximum delivery space under identical vent position in asymmetric working chamber will be significantly less than symmetrical working chamber, so institute The two-chamber sliding vane vacuum pump cylinder body interior volume specific ratio S of proposition_in/S_outBigger, interior volume specific ratio improves 25% or more.

It is above-mentioned although specific embodiments of the present invention are described with reference to the accompanying drawings, but it is not practical new to this The limitation of type protection scope, those skilled in the art should understand that, based on the technical solution of the present invention, ability Field technique personnel do not need to make the creative labor the various modifications or changes that can be made still in the protection model of the utility model Within enclosing.

Claims (2)

1. a kind of two-chamber sliding vane vacuum pump cylinder body, it is characterized in that: the molded line in cylinder body (1) is distributed successively in the direction of the clock are as follows: First suction casing curve AB, the first discharge section curve BC, the discharge section curve DA of the second suction casing curve CD and second, constituent curve Between be completely smooth connection and second dervative is continuous；A point and C point are the minimum point that slide plate can reach, and being located at origin O is circle The heart, radius are bottom radius of circle R₃Circle on；B point and D point are the highest point that slide plate can reach, and are located at using origin O as the center of circle, radius For tip circle radius R₁Circle on；The size of the corresponding central angle ∠ AOB of first suction casing curve AB is α, the first discharge section curve The size of the corresponding central angle ∠ BOC of BC is β, α < β and alpha+beta=180 °；First suction casing curve AB and the second suction casing curve CD is around origin O central symmetry, and the first discharge section curve BC and the second discharge section curve DA are around origin O central symmetry；Cylinder body (1) and Two identical asymmetric working chambers: the first working chamber (101) and the second working chamber (102) are formed between rotor (2).

2. a kind of two-chamber sliding vane vacuum pump cylinder body as described in claim 1, it is characterized in that:

The equation of first suction casing curve AB are as follows:

The equation of first discharge section curve BC are as follows:

The curvature of the first suction casing curve AB meets k simultaneously_AB> 0,

In formula: t is parameter.