KR-20260062706-A - TURBINE IMPELLER AND AIR COMPRESSOR INCLUDING THE SAME

KR20260062706AKR 20260062706 AKR20260062706 AKR 20260062706AKR-20260062706-A

Abstract

The present invention provides a turbine impeller comprising a hub; a plurality of blades installed on the front portion of the hub; a labyrinth seal formed to face each other between the hub and a turbine casing located on the outer side of the hub; and at least one projection disposed on the radially outer side of the hub and spaced apart, and an air compressor including the same.

Inventors

이창하

Assignees

현대자동차주식회사
기아 주식회사

Dates

Publication Date: 20260507
Application Date: 20241029

Claims (11)

Herb; A plurality of blades installed on the front of the above hub; A labyrinth seal formed to face each other between the hub and a turbine casing located on the outer side of the hub; and A turbine impeller comprising at least one projection disposed radially outward of the hub and spaced apart.
In paragraph 1, The above-mentioned protrusion is a turbine impeller formed with a rectangular cross-sectional shape.
In paragraph 2, The above-mentioned protrusion is a turbine impeller having a recess formed inwardly on a side portion corresponding to the rotational direction of the hub.
In paragraph 1, The above-mentioned protrusion is a turbine impeller formed with a triangular cross-sectional shape in which the surface corresponding to the rotational direction of the hub becomes inclined toward the rear.
In paragraph 1, The above labyrinth seal is, Deployed radially toward the front on the outer rear surface of the above hub, A turbine impeller arranged radially toward the rear on the inner front portion of the turbine casing.
In paragraph 5, The above labyrinth seal has a plurality of first convex portions and first groove portions alternately formed on the outer rear surface of the hub, and A plurality of second convex portions and second groove portions are alternately formed on the inner front surface of the turbine casing, and A turbine impeller in which the first convex portion and the first groove portion are each coupled to the second groove portion and the second convex portion.
In paragraph 6, The first convex portion and the second groove portion, and the first groove portion and the second convex portion are a turbine impeller that is sealed in the radial direction of the hub.
In Paragraph 7, A turbine impeller in which a plurality of the first convex portion and the first groove portion are each arranged along the circumferential direction at a radially outer position of the outer rear portion of the hub.
In Paragraph 7, A turbine impeller in which the second convex portion and the second groove portion are each arranged in multiple numbers along the circumferential direction of the inner front portion of the turbine casing.
In Paragraph 9, A turbine impeller having a surface extending from the second groove located at the outermost side of the labyrinth seal, which is inclined radially toward the rear.
An air compressor comprising the turbine impeller according to any one of claims 1 to 10.

Description

Turbine impeller and air compressor including the same The present invention relates to a turbine impeller and an air compressor including the same. Fuel cell systems can be classified according to the type of electrolyte used into phosphoric acid fuel cells (PAFC), molten carbonate fuel cells (MCFC), solid oxide fuel cells (SOFC), polymer electrolyte membrane fuel cells (PEMFC), alkaline fuel cells (AFC), and direct methanol fuel cells (DMFC); depending on the type of fuel used, as well as operating temperature and output range, they can be applied to various fields such as mobile power, transportation, and distributed power generation. Among these, polymer electrolyte fuel cells are being applied to hydrogen-powered vehicles being developed to replace internal combustion engine vehicles. Hydrogen-powered vehicles are configured to generate their own electricity through a chemical reaction between hydrogen and oxygen and drive a motor to drive. Such hydrogen-powered vehicles are equipped with a fuel cell system that includes a hydrogen tank for storing hydrogen gas, an air compressor for supplying air, and a fuel cell stack that generates electrical energy through the electrochemical reaction between hydrogen gas and air. Since the overall efficiency of a fuel cell system is determined by the output (Net Power) obtained by subtracting the power consumed by auxiliary components, such as the air compressor, from the total power generated by the fuel cell stack (Gross Power), it is necessary to reduce the power consumed by auxiliary components. In addition, recent fuel cell systems require high-pressure/high-flow air supply systems and high-capacity cooling systems to maximize performance and increase power density. The air compressor is one of the most critical components of the operating system, responsible for compressing ambient air and supplying it to the fuel cell stack. As operating pressure rises to high levels and required flow rates increase, the output of the air compressor is becoming significantly larger, and various efficiency enhancement technologies are being applied. In particular, the technology of recovering energy from the reaction air of the fuel cell stack that would otherwise be wasted by applying a turbine (expander) to the rotating shaft is being widely applied in high-output compressors. The fluid driving the turbine impeller is air discharged from the fuel cell stack. During the reaction of the fuel cell stack, the discharged air inevitably contains moisture, and this moisture enters drive components such as the turbine impeller or motor, causing problems such as freezing or hindering cold start. FIG. 1 is a drawing showing a fuel cell system according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing an air compressor according to an embodiment of the present invention. FIG. 3 is a cross-sectional view showing a turbine section according to an embodiment of the present invention. FIG. 4 is a perspective view showing a turbine impeller according to an embodiment of the present invention. Figure 5 is a diagram showing the operation of the protrusion of Figure 4 discharging fine droplets radially outward from the turbine impeller. FIG. 6 is a drawing showing various forms of the protrusions of a turbine impeller according to an embodiment of the present invention. Figure 7 is an enlarged view showing part 'A' of the turbine section of Figure 3. Hereinafter, some embodiments of the present invention will be described in detail with reference to the exemplary drawings. It should be noted that in assigning reference numerals to the components of the drawings, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of related known components or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted. In addition, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the embodiments of the present invention. These terms are intended only to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by the terms. Where it is stated that a component is "connected," "combined," or "connected" to another component, it should be understood that the component may be directly connected or connected to the other component, but that another component may also be "connected," "combined," or "connected" between each component. Hereinafter, a fuel cell system according to an embodiment of the present invention will be described in detail with reference to the attached drawings. FIG. 1 is a drawing showing a fuel cell system according to an embodiment of the present invention. As illustrated in FIG. 1, the fuel cell system ma