CN2104327U - Sliding-vane compressor (expandor) - Google Patents

Abstract

The utility model relates to a sliding-vane compressor (expander) for industry, which is composed of an air cylinder, wherein, a rotor is eccentrically arranged inside the air cylinder; the rotor is provided with a plurality of longitudinal slots which are provided with slide pieces which can freely slide radially; two ends of the air cylinder are provided with unloading rolling bearings whose inner diameters of inner rings are smaller than the inner diameter of the air cylinder, and whose inner rings can automatically rotate; consequently, the slide pieces are pressed on only the inner walls of the unloading rolling bearings, and the slide pieces do not contact the inner wall of the air cylinder; thus, mechanical efficiency of the compressor is improved by about 10%, and volume efficiency is improved by more than 5%.

Description

Sliding-vane compressor (expandor)

The utility model relates to a kind of fluid machinery, particularly a kind of compression (expansion) machine.

Widely used slide vane compressor and decompressor have identical working principle in industrial field, and only working medium is opposite with the flow direction in the decompressor at compressor.For sake of convenience, below be example with the slide vane compressor, introduce working principle with clear closely-related existing slide plate compression (expansion) machine in this patent Shen.

Existing slide vane compressor comprises and disposes rotor in a cylinder, the cylinder prejudicially, has on the rotor slide plate that can radially be free to slide is housed in some cannelures, the cannelure.Because rotor is eccentric configuration in cylinder, just constitute a crescent-shaped space between cylinder inner wall and rotor outer surface, during the rotor rotation, slide plate is thrown away from groove by centrifugal action, and be close on the cylinder inner wall face, crescent-shaped space just is separated into several cells, and this cell is called as " element volume ".Rotor revolve turn around within, each element volume value will be changed from small to big, and up to maximum value, be diminished gradually by maximum value, up to minimum value again.Along with the continuous rotation of rotor, the element volume value will be followed above-mentioned rule and change again and again.Thereby finish the cyclic process that air-breathing-compression-exhaust-expansion goes round and begins again (document: Deng Dingguo, Shu Pengcheng, " rotary compressor ", China Machine Press, 1989.6, P167-195).

By above-mentioned working principle as can be known, during the running of slide plate compression (expansion) machine, slide plate is pressed to cylinder inner wall because of being subjected to centrifugal action.Because the numerical value of this centrifugal force is bigger, thereby when slide plate and cylinder relative movement, produce very big mechanical friction loss, especially in that the slide plate density of material is big, peripheral velocity is high, friction factor is more outstanding greatly the time.

The purpose of this utility model is intended to propose a kind of slide plate compression (expansion) machine, disposed the rolling bearing of off-load effect at the cylinder two ends, slide plate only has been pressed on the inwall of off-load rolling bearing, and does not contact with cylinder inner wall, thereby reduced frictional loss, improved mechanical efficiency.

The utility model is the improvement to existing compression (expansion) machine.

Fig. 1 is shaft section figure of the present utility model.

Fig. 2 is a partial sectional view of the present utility model.

Below in conjunction with accompanying drawing structural principle of the present utility model and working principle are done detailed explanation.

With reference to Fig. 1, the utility model comprises in cylinder (3), the cylinder (3) and disposes rotor (1) prejudicially, has on the rotor (1) slide plate (2) that can radially be free to slide is housed in some cannelures, the cannelure; Dispose air-breathing aperture between a, the b of cylinder (3); Dispose vent ports between c, d.When element volume increases gradually and communicates with air-breathing aperture, begin to suck gas, reach maximum value up to the element volume value.At this moment, a back slide plate (with respect to sense of rotation) of forming this element volume will be crossed the edge b point in air-breathing aperture, and breathing process is stopped.After this, element volume begins to dwindle, gas is compressed within it, when the last slide plate of forming this element volume arrived the marginal point c of vent ports, element volume began to communicate with vent ports, and then compression process finishes, exhaust process begins, and when a back slide plate of this element volume was crossed the edge d point of vent ports, exhaust stopped, and element volume reaches minimum value.Continuation rotation along with rotor (1), element volume begins again to increase, so the pressurized gas that remains in this minimum volume will expand, after the last slide plate of element volume arrives the edge a point in air-breathing aperture, this element volume that is enlarging communicates with air-breathing aperture, restarts to suck gas.Several slide plates are arranged, then among rotor (1) whenever rotates a circle, just have several element volumes to carry out the cyclic process that goes round and begins again of air-breathing-compression-exhaust-expansion respectively successively.

With reference to Fig. 2, feature of the present utility model is to dispose off-load rolling bearing (5) at the two ends of cylinder (3).The inner ring of off-load rolling bearing (5) can rotate freely and the internal diameter of its inner ring littler than the internal diameter of cylinder (3).When slide plate (2) is thrown away by centrifugal force, just be close on the inner ring inwall of off-load rolling bearing (5).Like this, the centrifugal force of slide plate (2) is born by off-load rolling bearing (5), and slide plate (2) does not contact (having a very little gap △ 1) with the wall of cylinder (3), avoided the wearing and tearing of cylinder (3) inwall.After adopting off-load rolling bearing (5), though the specific pressure that slide plate (2) acts on off-load rolling bearing (5) inner ring has increased, but because the inner ring of off-load rolling bearing (5) can rotate, therefore, speed of related movement between slide plate (2) and off-load rolling bearing (5) inner ring is very little, so mechanical friction loss between slide plate (2) and off-load rolling bearing (5) inner ring and wearing and tearing all will reduce significantly.

Owing to adopt the off-load rolling bearing structure, just there is a very little gap △ 1 between slide plate (2) top and cylinder (3) internal face, gas will leak to the element volume of lower pressure from this gap by the element volume of elevated pressures.In order to reduce this leakage, can take following measure: the one, this gap is blocked in oil spout, adopts the slide vane compressor or the decompressor of present patent application, and preferably oil spout moves; The 2nd, reduce this gap width as far as possible, facts have proved that this gap is less than 0.04 millimeter, otherwise leakage rate will increase significantly.

Because off-load rolling bearing (5) inner ring rotates, so certain clearance △ 21 and △ 22 must be reserved in side, inner ring two ends, this gap length just right (0.03-0.05 millimeter) can not be too little in order to avoid influence rotating freely of off-load rolling bearing inner ring; Can not be too big, otherwise gas will leak to low voltage side from the zone of high pressure through this gap and raceway cavity.In order to reduce leakage rate as much as possible, go up and the corresponding position of off-load rolling bearing (5) inner ring at end cap (7), offered some ring packing teeth (4).Like this, add the effect of oil film, can make to leak and reduce to minimum.

To leak in order further reducing, to improve volumetric efficiency, the rotor of present patent application (1) axial clearance △ 31 and △ 32 are the 0.05-0.08 millimeter, and end cap (7) advances certain altitude to the cylinder convex, and processes some radial seal teeth (6) at this.

Adopt present patent application, having succeeded in developing a kind of air displacement is 6m ³/ min, exhaust pressure are the 10bar(gauge pressure) the aerodynamic force slide vane compressor.The performance test data that record show, compare with similar conventional slide vane compressor, and the mechanical efficiency of this compressor has improved about 10%, and volumetric efficiency has improved more than 5%.

Claims (3)

1, a kind of slide plate compression (expansion) machine, comprise cylinder (3), dispose rotor (1) in the cylinder (3) prejudicially, rotor has some cannelures on (1), the slide plate (2) that can radially be free to slide is housed in the cannelure, the a of cylinder (3), dispose air-breathing aperture between b, c, dispose vent ports between d, feature of the present utility model is, the two ends of cylinder (3) dispose the internal diameter off-load rolling bearing littler than the internal diameter of cylinder (3) of inner ring, there is a gap △ 1 between slide plate (2) top and cylinder (3) internal face, there are a gap △ 21 and △ 22 in side, off-load rolling bearing (5) inner ring two ends, can rotate freely with the inner ring that guarantees off-load rolling bearing (5).

2, slide plate compression (expansion) machine according to claim 1 is characterized in that said gap △ 1 is less than 0.04 millimeter.

3, slide plate compression (expansion) machine according to claim 1 is characterized in that said gap △ 21 and △ 22 are respectively between the 0.03-0.05 millimeter.