CN114412828A - Impeller structure for widening blockage flow of gas compressor - Google Patents

Abstract

The invention provides an impeller structure for widening the blocking flow of a gas compressor, which comprises a main body and blade groups uniformly distributed on the periphery of the main body along the radial direction, wherein the inner ring of the main body is fixedly sleeved on a transmission shaft, each blade group comprises a splitter blade and a combined swept impeller which are sequentially arranged along the radial direction of the periphery of the main body, the combined swept impeller comprises a first blade and a second blade, one end of the first blade and one end of the second blade are fixedly connected to the periphery of the main body, and the splitter blade, the first blade and the second blade are sequentially distributed along the radial direction of the main body. According to the impeller structure for widening the blocking flow of the gas compressor, the blade tip forward-swept blades and the blade tip backward-swept blades are combined and circumferentially arrayed to form the whole impeller structure, the throat sectional area of adjacent blades can be increased, and the combined swept impeller can effectively widen the blocking flow range of the gas compressor and achieve the purpose of meeting engineering requirements.

Description

An impeller structure for widening the blockage flow of the compressor

technical field

The invention belongs to the field of exhaust gas turbocharging, and in particular relates to an impeller structure for widening the blocked flow of a compressor.

Background technique

In the early 20th century, blade swept was first used in axial compressors, and many related studies have been carried out so far. Early research on blade sweep effect was to use blade sweep to improve performance. Hah et al. studied a transonic fan and found that blade forward and backward sweep had little effect on fan efficiency, but forward sweep could increase the fan's stall margin. Sweeping back reduces the stall margin of the fan. Jang et al. optimized a transonic axial flow compressor through the bending, inclination and sweeping of the blades. The optimal impeller internal flow separation and shock wave intensity were reduced, and the efficiency was improved. Among them, the blade bending was the most effective way to improve the impeller efficiency. method. Compared with axial flow compressors, the research on the aerodynamic effect of the leading edge sweep of centrifugal compressor blades is relatively limited. Hazby et al. concluded that forward sweep can achieve higher efficiency and a wider range of stable operating conditions, while backward sweep is the opposite. . Krain et al. obtained higher efficiency and greater blocking flow by swept-back of the leading edge of the blade. By changing different forward and backward sweep angles, Ganes et al. found that the sweep effect is related to the size of the sweep angle, and forward sweep and backward sweep have their own advantages. Xu et al. found that the inclination of the leading edge of the centrifugal impeller blade has a great influence on the performance of the impeller. Both forward and backward inclination can improve the highest efficiency of the impeller, but the backward inclination obtains the highest efficiency, and the forward inclination obtains the largest range of stable operating conditions.

At present, the research on blade leading edge inclination is relatively mature, and the research objects all use only one blade form to form a forward-swept impeller or a backward-swept impeller, and there is no attempt to combine the two into the entire impeller. Through research, the effect of combined swept impeller on compressor performance is mainly reflected in the increase of blocked flow.

SUMMARY OF THE INVENTION

In view of this, the present invention aims to propose an impeller structure that widens the blocked flow of the compressor, so as to solve the problems of small blocked flow and narrow flow working range of the supercharger.

In order to achieve the above object, the technical scheme of the present invention is achieved in this way:

An impeller structure for widening the blocked flow rate of a compressor, comprising a main body and a radially evenly distributed blade group on its periphery, an inner ring of the main body is fixedly sleeved to a transmission shaft, and each blade group includes flow-dividing blades arranged in sequence along the radial direction of the main body periphery and a combined swept impeller, and the combined swept impeller includes a first blade and a second blade, one end of the first blade and one end of the second blade are fixedly connected to the periphery of the main body, and the diverter blade, the first blade and the second blade are along the diameter of the main body. distributed sequentially.

Further, the first blade is a forward-swept blade.

Further, the second blade is a swept blade.

Further, the splitter blades are non-swept flow blades.

Compared with the prior art, the impeller structure for widening the blocked flow of the compressor according to the present invention has the following beneficial effects: the entire impeller is formed by combining both the forward-swept blade and the backward-swept blade in a circumferential array. The structural method can increase the throat cross-sectional area of the adjacent blades, and the combined swept impeller can effectively widen the flow range of the blockage of the compressor, so as to meet the project requirements.

Description of drawings

The accompanying drawings constituting a part of the present invention are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

1 is a schematic cross-sectional view of an impeller structure for widening a blocked flow rate of a compressor according to an embodiment of the present invention;

2 is a schematic structural diagram of an impeller structure for widening a blocked flow rate of a compressor according to an embodiment of the present invention;

3 is a schematic diagram of the structure of the meridian plane of the combined sweeping impeller according to an embodiment of the present invention;

4 is a schematic diagram of the structure of the meridian surface of the non-swept impeller according to the embodiment of the present invention;

5 is a schematic diagram of the structure of the meridian plane of the splitter blade according to an embodiment of the present invention;

Description of reference numbers:

1-First blade; 2-Second blade; 3-Split blade; 4-Main body; 5-No-sweep blade; 6-Forward sweep; 7-Backward sweep.

Detailed ways

It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict.

In the description of the present invention, it should be understood that the terms "center", "portrait", "horizontal", "top", "bottom", "front", "rear", "left", "right", " The orientation or positional relationship indicated by vertical, horizontal, top, bottom, inner, outer, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and The description is simplified rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first", "second", etc., may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

As shown in FIG. 2, an impeller structure for widening the blocked flow of the compressor includes a main body 4 and its peripheral blade groups evenly distributed in the radial direction. The inner ring of the main body 4 is fixedly sleeved to the transmission shaft. 4. The splitter vanes 3 and the combined swept impeller are arranged radially on the periphery, and the combined swept impeller includes a first vane 1 and a second vane 2, and one end of the first vane 1 and one end of the second vane 2 are fixedly connected to the main body 4. At the periphery, the splitter vanes 3, the first vanes 1 and the second vanes 2 are distributed in turn along the radial direction of the main body 4. As shown in Figures 1 and 2, the first vane 1 is a forward-swept vane that characterizes the forward sweep of the vane, and the second vane 2 is the swept blade characterizing the swept back of the blade, the splitter blade 3 is the unswept splitter blade 3, the main body 4 is radially evenly distributed with 4 splitter blades 3 and 4 combined swept impellers, and the splitter blades 3 and the combined swept impeller are staggered. Complete compressor wheel configuration.

The inlet airflow angle is 65.093°, the back bend angle is 24.814°, the diameter of the main body 4 is 130-150mm, and the impeller speed setting value is 60000rpm. Carry out the experimental data:

Impeller without swept blades

Rotating speed flow pressure ratio 60000 1.6728 2.5733 60000 1.6561 2.8289 60000 1.6146 3.0907 60000 1.4985 3.3836 60000 1.4695 3.3815 60000 1.4376 3.4224 60000 1.4008 3.4621

Impeller with simple forward swept blades

Rotating speed flow pressure ratio 60000 1.7518 2.6062 60000 1.7163 2.8491 60000 1.6409 3.0962 60000 1.4575 3.3319 60000 1.3987 3.3683 60000 1.2874 3.3973

Combined swept impeller

Figure 3 is a schematic diagram of the combined swept impeller meridian forward sweep and backward sweep, and the arrows indicate the gas flow direction. As shown in Figure 4, the conventional impeller only adopts one form of main blade, and the impeller in Figure 4 adopts no sweep without The swept blade 5, and the patent of the present invention describes a combined main blade in two different forms. As shown in Figure 3, the adjacent main blades are combined in the form of forward sweep and rear sweep of the leading edge of the blade, respectively. And four groups are formed to form a complete main blade structure. By combining the forward-swept blade tip and the blade-tip backward-swept blade and then circumferentially arraying the entire impeller structure, the throat cross-sectional area of adjacent blades can be increased. The combined swept impeller can effectively widen the blockage flow range of the compressor to meet the needs of the project.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (4)

1. The utility model provides an widen impeller structure of compressor jam flow which characterized in that: including main part (4) and the blade group of radial equipartition in periphery thereof, the fixed cover of main part (4) inner circle connects to the transmission shaft, every blade group includes along the splitter blade (3) and the combination that main part (4) periphery set gradually sweeped the impeller, and the combination sweepers the impeller and includes first blade (1) and second blade (2), the equal fixed connection in periphery of main part (4) of the one end of first blade (1) and the one end of second blade (2), splitter blade (3), first blade (1) and second blade (2) radially distribute gradually along main part (4).

2. The impeller structure for widening the blockage flow of the compressor according to claim 1, wherein: the first blade (1) is a forward swept blade.

3. The impeller structure for widening the blockage flow of the compressor according to claim 1, wherein: the second blade (2) is a swept-back blade.

4. The impeller structure for widening the blockage flow of the compressor according to claim 1, wherein: the splitter blade (3) is a non-glancing splitter blade (3).

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