Gas turbine engine hollow main shaft with impeller in inner cavity

Abstract

The invention relates to the technical field of engine spindles, and discloses a gas turbine engine hollow spindle with an impeller in an inner cavity. The gas turbine engine hollow main shaft with the impeller in the inner cavity comprises a main shaft section, a connecting shaft section and an auxiliary shaft section, the connecting shaft section is fixedly connected between the main shaft section and the auxiliary shaft section, a first groove is formed in one end of the auxiliary shaft section, a second groove is formed in the other end of the auxiliary shaft section, a second oil conveying cavity is formed in the auxiliary shaft section, and the impeller is arranged in the second oil conveying cavity. An oil guide blade is fixedly arranged on the cavity wall of the second oil conveying cavity; by means of the second oil conveying cavity and the oil guide blade, along with rotation of the main shaft, fuel oil leaves the second groove in an oil drop shape at the second groove in a rotary throwing-out mode, and the problems that according to a traditional baffling combustion chamber and an oil flinger, fuel oil distribution is not uniform, and fuel oil flow sensitivity is poor are solved; the reasonable oil mist distribution of fuel oil in the combustion chamber under different working conditions is ensured, the generation of a lean oil area and a rich oil area is reduced, and stable combustion is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of engine main shafts, and particularly relates to a hollow main shaft of a gas turbine engine with an impeller in the inner cavity. Background Art

[0002] High rotational speed and small size are prominent features of small gas turbine engines. Currently, a structure form of a baffle combustion chamber combined with an oil slinger for fuel supply is mostly adopted. The oil slinger is usually installed on the engine main shaft and rotates synchronously with the main shaft. Fuel is transported through the inner cavity of the main shaft to the annular cavity of the oil slinger, and is thrown towards the wall surface of the annular cavity by a huge centrifugal force, and is thrown into the flame tube through the uniformly distributed fuel injection holes on the wall surface, while atomization is completed at the same time. The intake air on the wall surface of the flame tube shears the oil mist, improves the atomization quality, and makes the oil and gas mix evenly. This structure has the advantages of good fuel atomization effect, simple and compact structure, light weight, simple and rapid starting, etc.

[0003] The current fuel supply method has obvious disadvantages, such as the fuel output at each fuel outlet is not uniform enough, obvious lean fuel areas and rich fuel areas appear, which is not conducive to the combustion in the combustion chamber, easy to form carbon deposits, slow response to fuel flow changes and oil leakage, etc., resulting in defects in the working performance of such engines, and serious fuel waste under certain conditions, affecting the working range of the engine. Therefore, we propose a hollow main shaft of a gas turbine engine with an impeller in the inner cavity. Summary of the Invention

[0004] The main purpose of the present invention is to provide a hollow main shaft of a gas turbine engine with an impeller in the inner cavity, which can effectively solve the problems in the background art.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A hollow main shaft of a gas turbine engine with an impeller in the inner cavity, as a rotor main shaft for transporting fuel, includes a main shaft section, a connecting shaft section, and a secondary shaft section. The connecting shaft section is fixedly connected between the main shaft section and the secondary shaft section and is located in the fuel outlet direction of the main shaft section. A first groove is opened at one end of the secondary shaft section, and the first groove surrounds the connecting shaft section. A second groove is opened at the other end of the secondary shaft section. A second oil delivery cavity is arranged in the secondary shaft section, and the second oil delivery cavity extends into the connecting shaft section. A first oil delivery cavity is arranged in the main shaft section. The first oil delivery cavity is arranged along the axial direction of the main shaft section and penetrates through both ends of the first oil delivery cavity. The first oil delivery cavity communicates with the second oil delivery cavity, and the second oil delivery cavity communicates with the second groove. Guide vanes are fixedly arranged on the cavity wall of the second oil delivery cavity.

[0007] Preferably, the diameters of the secondary shaft section, the connecting shaft section, and the main shaft section decrease in sequence; a first hole and a second hole are provided in the first groove, both the first hole and the second hole are arranged along the axial direction of the secondary shaft section, a third hole is provided on the outer peripheral side surface of the secondary shaft section, and the third hole is arranged along the radial direction of the secondary shaft section and communicates with the second hole.

[0008] Preferably, the diameter of the second fuel delivery chamber gradually increases along the fuel delivery direction, and the diameter of the second groove is larger than that of the second fuel delivery chamber; the connection part between the second fuel delivery chamber and the second groove is arranged as a flared opening.

[0009] Preferably, the oil guiding vanes are arranged along the axial direction of the second fuel delivery chamber, and a plurality of oil guiding vanes are provided and are arranged in a circumferential array along the second fuel delivery chamber.

[0010] Preferably, a plurality of second holes and a plurality of third holes are provided, the plurality of second holes and the plurality of third holes are both arranged in an axial array along the secondary shaft section, and the plurality of second holes communicate with the plurality of third holes respectively.

[0011] Preferably, a through hole is provided on the outer peripheral side surface of the main shaft section, and the through hole is arranged along the radial direction of the main shaft section and communicates with the first fuel delivery chamber.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] By providing a second fuel delivery chamber in the secondary shaft section and a first fuel delivery chamber in the main shaft section, the first fuel delivery chamber and the second fuel delivery chamber are communicated, and fuel is input from the first fuel delivery chamber and output through the second fuel delivery chamber; the diameter of the second fuel delivery chamber gradually increases along the fuel delivery direction, and the diameter of the surrounding cavity of the fuel becomes larger and larger during the movement of the fuel in the second fuel delivery chamber, so that the fuel becomes more and more dispersed during the movement; by fixedly arranging oil guiding vanes on the chamber wall of the second fuel delivery chamber, the entire main shaft rotates during the process of delivering fuel, so that the fuel is driven by the oil guiding vanes to rotate during the movement and thus obtains a centrifugal force, so that the fuel is output in the form of oil droplets by rotating and throwing out when output from the second fuel delivery chamber, improving problems such as uneven fuel distribution and poor fuel flow sensitivity of the traditional baffle combustion chamber and fuel injection disc, ensuring that a reasonable oil mist distribution can be formed by the fuel in the combustion chamber under different working conditions, reducing the generation of lean fuel areas and rich fuel areas, and being beneficial to stable combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the overall structure diagram of a hollow main shaft of a gas turbine engine with an impeller in the inner cavity according to the present invention;

[0015] Figure 2 It is the overall structure schematic diagram of a hollow main shaft of a gas turbine engine with an impeller in the inner cavity according to the present invention from another perspective;

[0016] Figure 3Side view of a hollow main shaft of a gas turbine engine with an impeller in the inner cavity according to the present invention;

[0017] Figure 4 Structural sectional view of a hollow main shaft of a gas turbine engine with an impeller in the inner cavity according to the present invention;

[0018] Figure 5 Connection sectional view of the second hole and the third hole of a hollow main shaft of a gas turbine engine with an impeller in the inner cavity according to the present invention.

[0019] In the figure: 1, auxiliary shaft section; 2, first groove; 3, second groove; 4, connecting shaft section; 5, main shaft section; 51, first oil delivery cavity; 52, through hole; 6, second oil delivery cavity; 7, first hole; 8, second hole; 9, third hole; 10, oil guiding vane. Detailed implementation manners

[0020] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0021] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", 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 simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0023] Such as Figures 1-5As shown in the figure, a hollow main shaft of a gas turbine engine with an impeller in the inner cavity, as a rotor main shaft for fuel delivery, includes a main shaft section 5, a connecting shaft section 4, and a secondary shaft section 1; the connecting shaft section 4 is fixedly connected between the main shaft section 5 and the secondary shaft section 1 and is located in the oil outlet direction of the main shaft section 5; the diameters of the secondary shaft section 1, the connecting shaft section 4, and the main shaft section 5 decrease in sequence; a first groove 2 is provided at one end of the secondary shaft section 1, the first groove 2 surrounds the connecting shaft section 4, a second groove 3 is provided at the other end of the secondary shaft section 1, a second oil delivery cavity 6 is arranged in the secondary shaft section 1, the second oil delivery cavity 6 is arranged along the axial direction of the secondary shaft section 1, the second oil delivery cavity 6 extends into the connecting shaft section 4, a first oil delivery cavity 51 is arranged in the main shaft section 5, the first oil delivery cavity 51 is arranged along the axial direction of the main shaft section 5 and penetrates both ends of the first oil delivery cavity 51, the first oil delivery cavity 51 communicates with the second oil delivery cavity 6, and the second oil delivery cavity 6 communicates with the second groove 3; fuel enters the first oil delivery cavity 51 from the side where the first oil delivery cavity 51 is located, passes through the second oil delivery cavity 6, and then is discharged from the second groove 3; a oil guiding vane 10 is fixedly arranged on the cavity wall of the second oil delivery cavity 6.

[0024] The diameter of the second oil delivery cavity 6 gradually increases along the fuel delivery direction, and the diameter of the second groove 3 is larger than that of the second oil delivery cavity 6; the connection part between the second oil delivery cavity 6 and the second groove 3 is arranged as a flared opening; during the process that fuel enters from the first oil delivery cavity 51 and is discharged from the second groove 3, the diameter of the cavity where the fuel is located becomes larger and larger; during the process of fuel delivery in the main shaft, the main shaft rotates at a high speed, and the oil guiding vane 10 rotates at a high speed to drive the fuel to rotate in the second oil delivery cavity 6, so that the fuel makes a rotational centrifugal motion synchronously during the process of moving along the axial direction of the main shaft. Since the diameter of the cavity around the fuel becomes larger and larger during the process of the fuel moving along the axial direction of the main shaft, the fuel becomes more and more dispersed during the moving process, and the dispersion degree of the fuel reaches an extreme value at the second groove 3, and the fuel is dispersed into several oil droplets and thrown out at the second groove 3; through the above, by using the second oil delivery cavity 6 and the oil guiding vane 10, as the main shaft rotates, the fuel leaves the second groove 3 in the form of oil droplets by rotating and throwing at the second groove 3, which improves the problems such as uneven fuel distribution and poor fuel flow sensitivity of the traditional baffle combustion chamber and fuel injection disc, ensures that the fuel can form a reasonable oil mist distribution in the combustion chamber under different working conditions, reduces the generation of lean oil areas and rich oil areas, and is beneficial to stable combustion.

[0025] It should be noted that the oil guiding vane 10 is arranged along the axial direction of the second oil delivery cavity 6, one end of the oil guiding vane 10 far from the cavity wall surface of the second oil delivery cavity 6 does not pass through the central axis of the second oil delivery cavity 6, and one end of the oil guiding vane 10 far from the cavity wall surface of the second oil delivery cavity 6 gradually approaches the cavity wall surface of the second oil delivery cavity 6 against the fuel delivery direction until it is connected with the cavity wall surface of the second oil delivery cavity 6. Further, a plurality of oil guiding vanes 10 are provided and are arranged in a circumferential array along the second oil delivery cavity 6, and the plurality of oil guiding vanes 10 rotate synchronously to fully drive the fuel to rotate and realize the full dispersion of the fuel.

[0026] A first hole 7 and a second hole 8 are formed in the first groove 2. Both the first hole 7 and the second hole 8 are arranged along the axial direction of the auxiliary shaft section 1. A third hole 9 is formed in the outer peripheral side surface of the auxiliary shaft section 1. The third hole 9 is arranged along the radial direction of the auxiliary shaft section 1 and communicates with the second hole 8.

[0027] There are multiple second holes 8 and multiple third holes 9. The multiple second holes 8 and the multiple third holes 9 are both arranged in an axial array along the auxiliary shaft section 1. The multiple second holes 8 communicate with the multiple third holes 9 respectively.

[0028] A through hole 52 is formed in the outer peripheral side surface of the main shaft section 5. The through hole 52 is arranged along the radial direction of the main shaft section 5 and communicates with the first oil delivery cavity 51.

[0029] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A hollow main shaft of a gas turbine engine with an impeller in the inner cavity, serving as a rotor main shaft for fuel delivery, comprising a main shaft section (5), a connecting shaft section (4) and a secondary shaft section (1), characterized in that: The connecting shaft section (4) is fixedly connected between the main shaft section (5) and the auxiliary shaft section (1), and is located in the oil outlet direction of the main shaft section (5); a first groove (2) is formed at one end of the auxiliary shaft section (1), the first groove (2) is arranged around the connecting shaft section (4), a second groove (3) is formed at the other end of the auxiliary shaft section (1), a second oil delivery cavity (6) is arranged in the auxiliary shaft section (1), the second oil delivery cavity (6) extends into the connecting shaft section (4), a first oil delivery cavity (51) is arranged in the main shaft section (5), the first oil delivery cavity (51) is arranged along the axial direction of the main shaft section (5) and penetrates through both ends of the first oil delivery cavity (51), the first oil delivery cavity (51) communicates with the second oil delivery cavity (6), the second oil delivery cavity (6) communicates with the second groove (3), and an oil guiding blade (10) is fixedly arranged on the cavity wall of the second oil delivery cavity (6).

2. A hollow main shaft of a gas turbine engine with an impeller in the inner cavity according to claim 1, characterized in that: The diameter of the auxiliary shaft section (1), the diameters of the connecting shaft section (4) and the main shaft section (5) decrease in sequence; a first hole (7) and a second hole (8) are formed in the first groove (2), both the first hole (7) and the second hole (8) are arranged along the axial direction of the auxiliary shaft section (1), a third hole (9) is formed in the outer peripheral side surface of the auxiliary shaft section (1), the third hole (9) is arranged along the radial direction of the auxiliary shaft section (1) and communicates with the second hole (8).

3. A hollow main shaft of a gas turbine engine with an impeller in the inner cavity according to claim 1, characterized in that: The diameter of the second oil delivery cavity (6) gradually increases along the fuel delivery direction, and the diameter of the second groove (3) is larger than that of the second oil delivery cavity (6); the connection part between the second oil delivery cavity (6) and the second groove (3) is arranged as a flared opening.

4. A hollow main shaft of a gas turbine engine with an impeller in the inner cavity, characterized in that: The oil guiding blade (10) is arranged along the axial direction of the second oil delivery cavity (6), and a plurality of oil guiding blades (10) are arranged and distributed in a circumferential array along the second oil delivery cavity (6).

5. A hollow main shaft of a gas turbine engine with an impeller in the inner cavity according to claim 1, characterized in that: A plurality of second holes (8) and a plurality of third holes (9) are arranged, the plurality of second holes (8) and the plurality of third holes (9) are both distributed in an axial array along the auxiliary shaft section (1), and the plurality of second holes (8) respectively communicate with the plurality of third holes (9).

6. A hollow main shaft of a gas turbine engine with an impeller in the inner cavity according to claim 1, characterized in that: A through hole (52) is formed in the outer peripheral side surface of the main shaft section (5), the through hole (52) is arranged along the radial direction of the main shaft section (5) and communicates with the first oil delivery cavity (51).

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