CN207795677U - The half-opened impeller of centrifugal compressor - Google Patents

Abstract

The utility model is related to a kind of half-opened impellers of centrifugal compressor, including wheel disc and along the equally distributed blade of wheel disc surrounding, the blade has top, bottom, pressure face, suction surface, leading edge and rear, the bottom of the blade is fixedly connected with wheel disc, and bar-shaped trough is offered on the top of the blade.Vane tip offers bar-shaped trough in the present invention, in impeller rotary course, gas in bar-shaped trough can form the vortex of zonule, the flow direction of the vortex is mutually perpendicular to leaf top leakage direction, effectively prevent in vane tip gap area gas from outlet to the leakage of import, to improve the operational efficiency of unit.

Description

The half-opened impeller of centrifugal compressor

Technical field

The utility model is related to half-opened impellers, and in particular to a kind of half-opened impeller of centrifugal compressor.

Background technology

Impeller is the core component of centrifugal compressor, can be divided into double shrouded wheel, half-opened impeller and unshrouded impeller.In recent years The application for carrying out half-opened impeller is more and more extensive.Using the unit of half-opened impeller, to ensure operational safety, such as Fig. 1 and Fig. 2 institutes Show, certain safety is reserved between the vane tip and compressor front cover plate 2 (single-stage) or partition board (multistage) of impeller 1 in design Gap 3, it is ensured that under operating condition, static pieces will not interfere with；Traditional half-opened impeller, vane tip molded line are by meridian plane On smooth curve along the circumferential direction rotate, be crossed to form with impeller channel.Due to depositing for leaf top and front shroud or spacer gap In unit running process, gas is inevitably present (low towards impeller inlet from impeller outlet (high pressure) in blade tip clearance 3 Pressure) direction flowing, referred to as internal leakage.For compressor operating, the efficiency of unit operation is reduced.

Utility model content

In order to overcome drawbacks described above, the utility model provides a kind of half-opened impeller of centrifugal compressor, by impeller Vane tip fluting, the leakage of gas in vane tip gap area is effectively prevented, to improve the operation of impeller Effect.

The utility model in order to solve its technical problem used by technical solution be：

A kind of half-opened impeller of centrifugal compressor, including wheel disc and along the equally distributed blade of wheel disc surrounding, it is described Blade has top, bottom, pressure face, suction surface, leading edge and rear, and the bottom of the blade is fixedly connected with wheel disc, described Bar-shaped trough is offered on the top of blade.

Preferably, the bar-shaped trough is opened up along at the top of pressure face.

Preferably, 0.75 times of the length of the bar-shaped trough not less than top total length.

Preferably, the distance between starting point Yu leading edge of the bar-shaped trough are less than the thickness at top and are more than 3mm, the item The distance between terminal and rear of shape slot are less than the width at top and are more than 3mm.

Preferably, the depth of the bar-shaped trough is 0.2~0.35 times of vane tip width.

Preferably, the width of the bar-shaped trough is no more than the 1/3 of vane tip width, but is not less than 1mm.

Preferably, the blade includes linear leaf and short blade, and the linear leaf and short blade are spaced apart.

Preferably, the rear of the linear leaf and the rear of short blade are flush, and the leading edge of the short blade is positioned at described The up-front rear portion of linear leaf.

The utility model has the beneficial effects that：Vane tip offers bar-shaped trough in the present invention, is rotated in impeller In the process, the gas in bar-shaped trough can form the vortex of zonule, and flow direction and the leaf top of the vortex leak direction phase It is mutually vertical, effectively prevent in vane tip gap area that gas is from outlet to the leakage of import, to improve unit Operational efficiency.

Description of the drawings

Fig. 1 is the structural schematic diagram of impeller in the prior art；

Fig. 2 is the schematic diagram for generating internal leakage between impeller and compressor in the prior art；

Fig. 3 is the structural schematic diagram of the utility model；

Fig. 4 is the partial enlarged view of Fig. 3；

Fig. 5 is the schematic diagram for forming vortex in the utility model in bar-shaped trough；

In figure：10- wheel discs, 20- blades, the tops 21-, 211- bar-shaped troughs, the bottoms 22-, 23- pressure faces, 24- suction surfaces, 25- leading edges, 26- rears, 27- linear leafs, 28- short blades, 30- vortex.

Specific implementation mode

Below in conjunction with the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out clear, complete Site preparation describes, it is clear that the described embodiments are only a part of the embodiments of the utility model, instead of all the embodiments. It is obtained by those of ordinary skill in the art without making creative efforts based on the embodiments of the present invention Every other embodiment, shall fall within the protection scope of the present invention.

Embodiment：As in Figure 3-5, a kind of half-opened impeller of centrifugal compressor, including wheel disc 10 and along wheel disc four All equally distributed blades 20, the blade 20 have top 21, bottom 22, pressure face 23, suction surface 24, leading edge 25 and rear 26, the bottom 22 of the blade 20 is fixedly connected with wheel disc 10, and bar-shaped trough 211 is offered on the top 21 of the blade 20.Institute It includes linear leaf 27 and short blade 28 to state blade 20, and the linear leaf 27 and short blade 28 are spaced apart, the linear leaf 27 Rear 26 and the rear 26 of short blade 28 are flush, and the leading edge 25 of the short blade 28 is located at the up-front rear portion of the linear leaf. The utility model offers bar-shaped trough at the top of traditional impeller blade, and the specific shape and size of bar-shaped trough should be with impeller Pneumatic design and impeller top clearance and be varied from, by the design of bar-shaped trough, in impeller rotary course, bar-shaped trough Interior gas can form the vortex of zonule, the vortex 30 (as shown in figure 5, the arrow in figure indicates air whirl direction) Flow direction and leaf top leakage direction be mutually perpendicular to, effectively prevent in vane tip gap area gas from outlet into The leakage of mouth, to improve the operational efficiency of unit.The utility model is equally applicable to the impeller with deviated splitter vane, can be with Bar-shaped trough 211 is all offered at the top of deviated splitter vane.

Specifically, the bar-shaped trough 211 is opened up along close to the top 21 of pressure face 23, and the length of the bar-shaped trough 211 is not Less than 0.75 times of top total length, the distance between starting point and leading edge 25 of the bar-shaped trough 211 be less than top thickness and More than 3mm, the distance between terminal and rear 26 of the bar-shaped trough 211 are less than the width at top and are more than 3mm, the bar shaped The depth of slot 211 is 0.2~0.35 times of vane tip width.Vane tip thickness is δ, and δ is bigger, then multiple is smaller；Such as δ When=5mm, bar shaped groove depth multiple takes 0.25；When more than 5mm, multiple is less than 0.25, but depth value is no more than 3mm；Less than 5mm When, multiple is less than 0.25, but depth value is not less than 1mm.The width of the bar-shaped trough 211 is no more than the 1/3 of vane tip width, But it is not less than 1mm.If vane tip width is less than 2mm, it is not recommended that fluting.

Concrete case：The centrifugal compressor manufactured and designed by certain domestic coal chemical enterprise of inventor, scene is for one with one Standby two units.The design parameter of two units is completely the same, and unique difference is not slotted at the top of 1# machines impeller, is conventional junction Structure；2# machine impellers use the vane tip notching construction of the utility model, and bar-shaped trough is the spherical shape circle that ball head knife is process Bottom.Unit finds that 2# machines ratio 1# machine operational efficiency is high by 0.64% under declared working condition when testing；After 1# machines and the exchange of 2# machine impellers Again it tests, it is found that 1# machine ratio 2# machine operational efficiency is high by 0.52% under declared working condition, it is possible thereby to illustrate the utility model structure Help to improve the operational efficiency of impeller.

It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the premise utility, Various modifications and improvements can be made, these belong to the scope of protection of the utility model.Therefore, the utility model patent Protection domain should be determined by the appended claims.

Claims (8)

1. a kind of half-opened impeller of centrifugal compressor, it is characterised in that：Uniformly divide including wheel disc (10) and along wheel disc surrounding The blade (20) of cloth, the blade (20) have top (21), bottom (22), pressure face (23), suction surface (24), leading edge (25) It is fixedly connected with wheel disc (10) with the bottom (22) of rear (26), the blade (20), on the top (21) of the blade (20) Offer bar-shaped trough (211).

2. the half-opened impeller of centrifugal compressor according to claim 1, it is characterised in that：Bar-shaped trough (211) edge It is opened up close to the top (21) of pressure face (23).

3. the half-opened impeller of centrifugal compressor according to claim 2, it is characterised in that：The bar-shaped trough (211) Length is not less than 0.75 times of top total length.

4. the half-opened impeller of centrifugal compressor according to claim 2, it is characterised in that：The bar-shaped trough (211) The distance between starting point and leading edge (25) are less than the thickness at top and are more than 3mm, the terminal and rear of the bar-shaped trough (211) The distance between (26) it is less than the width at top and is more than 3mm.

5. the half-opened impeller of centrifugal compressor according to claim 2, it is characterised in that：The bar-shaped trough (211) Depth is 0.2~0.35 times of vane tip width.

6. the half-opened impeller of centrifugal compressor according to claim 2, it is characterised in that：The bar-shaped trough (211) Width is no more than the 1/3 of vane tip width, but is not less than 1mm.

7. according to the half-opened impeller of claim 1-6 any one of them centrifugal compressors, it is characterised in that：The blade (20) include linear leaf (27) and short blade (28), the linear leaf (27) and short blade (28) are spaced apart.

8. the half-opened impeller of centrifugal compressor according to claim 7, it is characterised in that：After the linear leaf (27) Edge (26) and the rear (26) of short blade (28) are flush, and the leading edge (25) of the short blade (28) is located at the linear leaf leading edge Rear portion.