CN208364389U

CN208364389U - A kind of single-chamber sliding vane vacuum pump cylinder body

Info

Publication number: CN208364389U
Application number: CN201820789209.4U
Authority: CN
Inventors: 陈志凯; 魏蜀红; 王君; 杨舒然; 冯浩志; 沙润东; 范璇璇
Original assignee: China University of Petroleum East China
Current assignee: China University of Petroleum East China
Priority date: 2018-05-25
Filing date: 2018-05-25
Publication date: 2019-01-11
Anticipated expiration: 2028-05-25

Abstract

The utility model discloses a kind of single-chamber sliding vane vacuum pump cylinder body, the intracorporal molded line of cylinder is made of suction casing curve and discharge section curve sinusoidal spiral line, is completely smooth connection between constituent curve and second dervative is continuous；The size that suction casing curve corresponds to central angle is α, and the size that discharge section curve corresponds to central angle is β, α < β and alpha+beta=360 °, forms an asymmetric working chamber between cylinder body and rotor, reduces delivery space, increase effectively interior volume specific ratio；The single-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 single-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 single-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 solve the problems, such as that sliding vane vacuum pump interior volume specific ratio is small, also for the type of abundant cylinder shaped conductor, this is practical new Type proposes a kind of single-chamber sliding vane vacuum pump cylinder body.Cylinder shaped conductor is constructed using sinusoidal spiral line, changes sucking and discharge Duan Qu Line corresponds to the accounting of central angle, and reaching keeps the structure of working chamber asymmetric, reduces delivery space, increases the purpose of interior volume specific ratio. All curves meet that second dervative is continuous on cylinder shaped conductor, guarantee slide plate top in the sliding being kept in contact with inboard wall of cylinder block not Rigid shock and soft impulse occurs.

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

A kind of single-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: suction casing is bent Line AB and discharge section curve BA, is completely smooth connection between constituent curve and second dervative is continuous；A point is that slide plate can reach most Low spot is located at using origin O as the center of circle, and radius is bottom radius of circle R₃Circle on；B point is the highest point that can reach of slide plate, be located at Origin O is the center of circle, and radius is tip circle radius R₁Circle on；The size of the corresponding central angle ∠ AOB of suction casing curve AB is α, row The size of the corresponding central angle ∠ BOA of section curve BA is β, α < β and alpha+beta=360 ° out；It is formed between cylinder body (1) and rotor (2) One asymmetric working chamber (101).

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

The equation of section curve BA is discharged are as follows:

The curvature of 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) single-chamber sliding vane vacuum pump cylinder shaped conductor type is enriched.

Detailed description of the invention

Fig. 1 is single-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 ∠ BOA size； 1-cylinder body；101-asymmetric working chambers；2-rotors；3-air entries；4-exhaust outlets；5-the first slide plate；6-the second is sliding Piece；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: suction casing curve AB and discharge section Curve BA is completely smooth connection between constituent curve and second dervative is continuous；A point is the minimum point that can reach of slide plate, be located at Origin O is the center of circle, and radius is bottom radius of circle R₃Circle on；B point is the highest point that slide plate can reach, and is located at using origin O as the center of circle, Radius is tip circle radius R₁Circle on；The size of the corresponding central angle ∠ AOB of suction casing curve AB is α, and BA pairs of section curve is discharged The size of the central angle ∠ BOA answered is β, α < β and alpha+beta=360 °；The equation of suction casing curve AB are as follows:

The equation of section curve BA is discharged are as follows:

In formula: t is parameter.

As shown in Fig. 2, the size β of size α and central angle the ∠ BOA 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 ∠ BOA of central angle ∠ AOB is excessive, song of the suction casing curve AB near A point For line curvature less than zero, there is interior convex-segment in curve, causes slide plate to contact with inboard wall of cylinder block and falls off, and slide plate and cylinder body at this Serious wear, therefore the size β of size α and central angle the ∠ BOA of central angle ∠ AOB wants reasonable value, guarantees suction casing curve The curvature k of AB_AB> 0,

The difference of the size β of size α and central angle the ∠ BOA of central angle ∠ AOB is bigger, and suction casing curve AB is more precipitous, Discharge section curve BA is gentler, and the interior volume specific ratio of sliding vane vacuum pump is bigger；Difference is smaller, and suction casing curve AB is gentler, discharge Section curve BA is more precipitous, and the interior volume specific ratio of sliding vane vacuum pump is smaller, as α=β, as shown in phantom in FIG., suction casing curve AB It is symmetrical about horizontal axis with discharge section curve BA.

As shown in figure 3, forming an asymmetric working chamber (101) between cylinder body (1) and rotor (2), it is not in relation to horizontal axis Symmetrically.

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 single-chamber sliding vane vacuum pump cylinder body interior volume specific ratio S of proposition_in/S_outBigger, interior volume specific ratio improves 60% 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

1. a kind of single-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: Suction casing curve AB and discharge section curve BA, is completely smooth connection between constituent curve and second dervative is continuous；A point be molded line most Near point is located at using origin O as the center of circle, and radius is bottom radius of circle R₃Circle on；B point is molded line farthest point, and being located at origin O is circle The heart, radius are tip circle radius R₁Circle on；The size of the corresponding central angle ∠ AOB of suction casing curve AB is α, and section curve BA is discharged The size of corresponding central angle ∠ BOA is β, α < β and alpha+beta=360 °；An asymmetry is formed between cylinder body (1) and rotor (2) Working chamber (101).

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

The equation of suction casing curve AB are as follows:

The equation of section curve BA is discharged are as follows:

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

In formula: t is parameter.