CN118911840A - Starter structure for turboshaft engine - Google Patents

Abstract

The invention relates to the technical field of turboshaft engine supporting equipment, in particular to a starting structure for a turboshaft engine, which comprises an air inlet pipe, an impeller, a rotor and a stator; the impeller is rotatably arranged in the air outlet; the impeller is provided with a first air flow passage and a second air flow passage; the rotor is arranged on the impeller and can drive the impeller to rotate or rotate along with the impeller; the stator is arranged in the rotor. Compared with the traditional mode of additionally installing the generator, the device for supplying lubricating oil to the joint of the engine and the generator does not need to be additionally arranged, the service life of the generator is guaranteed, and the connecting structure and the pipeline layout are simplified. When generating electricity, the first air flow channel or the second air flow channel on the impeller in a rotating state enables cold air flowing in from the outside to be split, and the cold air fully contacts the surfaces of the stator and the rotor, so that the purpose of cooling the stator and the rotor is achieved, and an extra cooling device is not needed to be additionally arranged for cooling the generator.

Description

Starting structure for turboshaft engine

Technical Field

The invention relates to the technical field of turboshaft engine supporting equipment, and in particular to a starting structure for a turboshaft engine.

Background Art

For small turboshaft engines, the starter used only has the function of starting the engine. If it is necessary to generate electricity with the help of a small turboshaft engine, a generator must be installed. The maximum speed of the turbine shaft can reach 60,000-70,000 r/min. The connection between the engine and the generator is severely worn. The temperature of the generator is extremely high when generating electricity at high speed. Therefore, it is necessary to install a device to supply lubricating oil to the connection between the engine and the generator and a cooling device to cool the generator, which greatly increases the design cost of the starting structure for the turboshaft engine.

Summary of the invention

The invention provides a starting structure for a turboshaft engine, which is used to reduce the design cost of the starting structure for the turboshaft engine.

The present invention provides a starting structure for a turboshaft engine, comprising:

The air inlet pipe has an air inlet at one end and an air outlet at the other end;

An impeller is rotatably mounted in the air outlet; a first air flow channel and a second air flow channel are formed on the impeller;

The rotor is installed on the impeller and can drive the impeller to rotate or rotate with the impeller;

The stator is arranged inside the rotor.

In some of the embodiments, a receiving groove is formed in the middle of the impeller; a rotor and a stator are installed in the receiving groove; and the second air flow channel is connected to the receiving groove.

In some embodiments, it also includes:

The guide head is fixedly installed in the air inlet; the stator is detachably connected to the guide head through a connecting component.

In some embodiments, the connection component includes:

A locking screw, one end of which is fixed on the guide head;

The locking sleeve is sleeved outside the locking screw, one end of which abuts against the guide head, and the end away from the guide head is provided with a plurality of expansion grooves along the circumferential direction; the end of the locking sleeve away from the guide head is provided with a stator;

The locking nut is threadedly connected to the end of the locking screw away from the guide head, and the outer wall is in contact with the inner wall of the end of the locking sleeve away from the guide head.

In some embodiments, the diameter of the middle portion of the air inlet pipe is smaller than the diameter of the air inlet and the diameter of the air outlet.

In some embodiments, the air intake pipe comprises:

The first pipe section;

One end of the second pipe section is detachably connected to the first pipe section.

In some embodiments, the rotor comprises:

The magnetic ring is fixedly mounted on the impeller;

There are multiple magnetic strips which are evenly installed in the magnetic ring along the circumference of the magnetic ring.

In some embodiments, the stator comprises:

stator core;

The stator winding is installed on the stator core.

In some embodiments, it also includes:

One end of the first transmission shaft is detachably connected to the impeller.

In some embodiments, it also includes:

The speed governor is installed on the impeller and the rotor. When the rotor drives the impeller to rotate, the speed governor is used to increase the speed of the impeller. When the rotor rotates with the impeller, the speed governor is used to reduce the speed of the rotor.

The beneficial effects of the present invention are as follows: the starting structure for the turboshaft engine of the present invention is provided with an air intake pipe, an impeller, a rotor and a stator. When the power supply on the unmanned helicopter supplies power to the stator, the rotor rotates, driving the impeller to rotate, thereby achieving the purpose of starting the impeller. When the speed of the impeller reaches 6000r/min, the power supply to the stator is stopped. The rotor rotates with the impeller, and the stator outputs power to the unmanned helicopter to achieve the purpose of power generation, which is beneficial to improving the endurance of the unmanned helicopter. The rotating impeller compresses the air from the outside with the help of the first air flow channel to meet the subsequent working needs of the combustion chamber. Compared with the traditional form of adding a generator, there is no need to add a device for supplying lubricating oil to the connection between the engine and the generator, which ensures the service life of the generator and simplifies the connection structure and pipeline layout. When generating electricity, the first air flow channel or the second air flow channel on the rotating impeller allows the cold air flowing in from the outside to be diverted and fully contact the surface of the stator and the rotor to achieve the purpose of cooling the stator and the rotor, and there is no need to add an extra cooling device to cool the generator. On the whole, the structure is relatively simple, which greatly reduces the design and processing cost of the starting structure for the turboshaft engine, realizes the lightweight design of the starting structure for the turboshaft engine, and is beneficial to increasing the flight load of the unmanned helicopter.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a cross-sectional view of some specific embodiments of a starting structure for a turboshaft engine according to the present invention;

FIG2 is a partial enlarged view of area A in FIG1 ;

FIG3 is an exploded view of the turboshaft engine starting structure shown in FIG1 ;

FIG4 is a schematic diagram of the combined structure of some specific embodiments of the rotor and the impeller in the starting structure for the turboshaft engine shown in FIG1 ;

FIG. 5 is a schematic diagram of the combined structure of some other specific embodiments of the rotor and the impeller.

In the accompanying drawings, 110, air intake pipe; 111, first pipe section; 112, second pipe section; 120, impeller; 121, first air flow channel; 122, second air flow channel; 123, accommodating groove; 130, rotor; 131, magnetic ring; 132, magnetic strip; 140, stator; 150, guide head; 160, connecting assembly; 161, locking screw; 162, locking sleeve; 1621, expansion groove; 163, locking nut; 170, first transmission shaft; 180, speed regulator; 181, outer gear ring; 182, inner gear ring; 183, second transmission shaft.

DETAILED DESCRIPTION

The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

The working principle of the turboshaft engine is as follows: First, the starter drives the compressor impeller to rotate, and the air is compressed by the rotating impeller and flows into the combustion chamber. When the impeller speed reaches 6000r/min, the starter stops working. In the combustion chamber, the fuel and the compressed high-pressure air burn, and the high-temperature and high-pressure gas generated acts on the turbine, which rotates at high speed. The high-speed rotating turbine drives the compressor impeller to rotate, so that the impeller speed reaches more than 30,000r/min, and can reach up to 60,000-70,000r/min, and the rotor of the unmanned helicopter rotates through the output shaft.

As mentioned in the background technology, for a small turboshaft engine, the starter used only has the function of starting the engine. If it is necessary to generate electricity with the help of a small turboshaft engine, a generator must be installed. The maximum speed of the turbine shaft can reach 60,000-70,000 r/min, and the connection between the engine and the generator is severely worn. The temperature of the generator is extremely high when generating electricity at high speed. Therefore, it is necessary to install a device for supplying lubricating oil to the connection between the engine and the generator and a cooling device for cooling the generator, which greatly increases the design cost of the starting structure for the turboshaft engine.

To solve the above problems, with reference to FIGS. 1, 2, 3 and 4, the present invention provides a starting structure for a turboshaft engine, comprising an air intake pipe 110, an impeller 120, a rotor 130 and a stator 140. One end of the air intake pipe 110 is an air inlet, and the other end is an air outlet. The air outlet of the air intake pipe 110 is connected to the air inlet of the compressor. The impeller 120 is rotatably mounted in the air outlet. A first air flow channel 121 and a second air flow channel 122 are formed on the impeller 120. The rotor 130 is mounted on the impeller 120, and can drive the impeller 120 to rotate or rotate with the impeller 120. The stator 140 is arranged in the rotor 130. When the power supply on the unmanned helicopter supplies power to the stator 140, the rotor 130 rotates, driving the impeller 120 to rotate, thereby achieving the purpose of starting the impeller 120. When the speed of the impeller 120 reaches 6000r/min, the power supply to the stator 140 is stopped. The rotor 130 rotates with the impeller 120, and the stator 140 outputs electricity to the unmanned helicopter to achieve the purpose of power generation, which is beneficial to improving the endurance of the unmanned helicopter. When the impeller 120 rotates, air from the outside flows into the air intake pipe 110 from the air inlet of the air intake pipe 110, and then flows through the first air flow channel 121 or the second air flow channel 122 on the impeller 120, and then flows to the air inlet of the compressor through the air outlet of the air intake pipe 110. The air flow direction is shown in the direction of the arrows in Figures 1 and 2. The rotating impeller 120 compresses the air from the outside with the help of the first air flow channel 121 to meet the subsequent working needs of the combustion chamber. Compared with the traditional form of adding a generator, there is no need to add a device to supply lubricating oil to the connection between the engine and the generator, which ensures the service life of the generator and simplifies the connection structure and pipeline layout. When generating electricity, the first air flow channel 121 or the second air flow channel 122 on the rotating impeller 120 allows the cold air flowing in from the outside to be diverted and fully contact the surface of the stator 140 and the rotor 130, so as to achieve the purpose of cooling the stator 140 and the rotor 130, and no additional cooling device is needed to cool the generator. Overall, the structure is relatively simple, which greatly reduces the design and processing cost of the turboshaft engine starting structure, realizes the lightweight design of the turboshaft engine starting structure, and is conducive to increasing the flight load of the unmanned helicopter.

Preferably, the impeller 120 is provided with a plurality of blades along the circumference. A first air flow channel 121 is formed between adjacent sides of every two adjacent blades. There are a plurality of second air flow channels 122, which are evenly distributed in the middle of the impeller 120 along the circumference of the impeller 120.

Specifically, in the exemplary embodiment, a receiving groove 123 is formed in the middle of the impeller 120, and the rotor 130 and the stator 140 are installed in the receiving groove 123. In this way, the impeller 120 can protect the rotor 130 and the stator 140 and extend their service life. At the same time, the structure is relatively compact and the space occupied is reduced. Each second air flow channel 122 is connected to the receiving groove 123 and the first air flow channel 121 respectively. In this way, it is beneficial to fully dissipate the heat of the stator 140 and the rotor 130 by means of the first air flow channel 121 or the second air flow channel 122.

Specifically, in the exemplary embodiment, the starting structure for the turboshaft engine also includes a guide head 150, a connecting assembly 160 and a first transmission shaft 170. The guide head 150 is fixedly installed in the air inlet to guide the airflow and, at the same time, to support and fix the stator 140. In addition, the guide head 150 can protect the stator 140 and the rotor 130 at one end. The stator 140 is detachably connected to the guide head 150 through the connecting assembly 160 to facilitate the disassembly, maintenance, replacement and installation of the stator 140. One end of the first transmission shaft 170 is detachably connected to the impeller 120 to facilitate the assembly and disassembly of the impeller 120 and the first transmission shaft 170. The other end of the first transmission shaft 170 is connected to the turbine. The turbine can drive the impeller 120 to rotate through the first transmission shaft 170.

Preferably, the guide head 150 is a conical hollow structure, and the cross section of the end away from the stator 140 is smaller, and the cross section of the end close to the stator 140 is larger, which has a better guide effect. A fixing seat is arranged inside the guide head 150. The stator 140 is detachably connected to the fixing seat in the guide head 150 through the connecting assembly 160.

Preferably, the connection assembly 160 includes a locking screw 161, a locking sleeve 162 and a locking nut 163. One end of the locking screw 161 is fixed to the fixing seat of the guide head 150. The locking sleeve 162 is sleeved outside the locking screw 161, one end of which abuts against one side of the fixing seat of the guide head 150, and 4-6 expansion grooves 1621 are opened along the circumferential direction at the end away from the guide head 150. The stator 140 is provided on the outer sleeve of the end of the locking sleeve 162 away from the guide head 150. The locking nut 163 is screwed to the end of the locking screw 161 away from the guide head 150, and the outer wall is in contact with the inner wall of the end of the locking sleeve 162 away from the guide head 150. By rotating the locking nut 163, the locking nut 163 moves along the axial direction of the locking screw 161, so that the end of the locking sleeve 162 away from the guide head 150 expands or contracts, and then the outer wall of the locking sleeve 162 and the inner wall of the stator 140 are closely attached to or separated from each other. In this way, the disassembly of the stator 140 is convenient, and after assembly, the stator 140 is not easy to be separated from the locking sleeve 162.

Preferably, the locking nut 163 is a conical hollow structure with threads on the inner wall. The cross-section of the end facing the guide head 150 is smaller, and the cross-section of the end away from the guide head 150 is larger. This further makes it difficult for the stator 140 to detach from the locking sleeve 162.

Preferably, a limiting sleeve is installed in the receiving groove 123 of the impeller 120, and the axis of the limiting sleeve is arranged colinearly with the axis of the first transmission shaft 170. One end of the first transmission shaft 170 is inserted into the limiting sleeve to limit the first transmission shaft 170 from moving axially.

Preferably, the diameter of the middle part of the air inlet pipe 110 is smaller than the diameter of the air inlet and the diameter of the air outlet, which not only helps to increase the degree of air compression, but also allows the cold air to flow through the surface of the stator 140 and the rotor 130 in a concentrated manner, thereby fully cooling the stator 140 and the rotor 130.

Specifically, in the exemplary embodiment, the air intake pipe 110 includes a first pipe section 111 and a second pipe section 112. One end of the second pipe section 112 is detachably connected to one end of the first pipe section 111 by means of screws and threaded holes, which facilitates the assembly and disassembly of the air intake pipe 110. One end of the first pipe section 111 away from the second pipe section 112 is an air inlet. One end of the second pipe section 112 away from the first pipe section 111 is an air outlet. One end of the second pipe section 112 away from the first pipe section 111 can be detachably connected to the compressor by means of screws and threaded holes, which facilitates the assembly and disassembly of the starting structure and the compressor.

Specifically, in the exemplary embodiment, the rotor 130 includes a magnetic ring 131 and magnetic strips 132. The magnetic ring 131 is fixedly installed in the receiving groove 123 of the impeller 120. There are a plurality of magnetic strips 132, which are evenly installed in the magnetic ring 131 along the circumference of the magnetic ring 131.

Preferably, 6-8 mounting grooves are provided on the inner wall of the magnetic ring 131. There are 6-8 magnetic strips 132, which are embedded in the mounting grooves in a one-to-one correspondence with the mounting grooves.

Specifically, in the exemplary embodiment, the stator 140 includes a stator core and a stator winding. The stator winding is installed on the stator core.

In some applications, as shown in FIG. 1 and FIG. 4 , the starting structure for the turboshaft engine is not provided with a speed regulator 180, and the magnetic ring 131 of the rotor 130 is connected to the receiving groove 123 on the impeller 120 by an interference fit. Before assembly, the impeller 120 is first heated to expand the receiving groove 123. Then, the magnetic ring 131 is installed in the receiving groove 123. After that, the impeller 120 is cooled naturally. In this way, the stability of the connection between the magnetic ring 131 and the impeller 120 is improved to prevent the magnetic ring 131 from falling off the impeller 120 when rotating at high speed. Moreover, the thermal expansion coefficient of the magnetic ring 131 should be greater than or equal to that of the impeller 120 to prevent the magnetic ring 131 from falling off the impeller 120 when the magnetic ring 131 and the impeller 120 are heated.

In other applications, referring to FIG. 5 , the turboshaft engine starting structure is further provided with a speed governor 180. The speed governor 180 is mounted on the impeller 120 and the rotor 130. When the rotor 130 drives the impeller 120 to rotate, the speed governor 180 is used to increase the rotation speed of the impeller 120, thereby improving the starting efficiency and accelerating the starting. When the rotor 130 rotates with the impeller 120, the speed governor 180 is used to reduce the rotation speed of the rotor 130, thereby facilitating the later rectification and pressure regulation. Specifically, the magnetic ring 131 of the rotor 130 is rotatably connected to the receiving groove 123 on the impeller 120 through a bearing. The speed governor 180 includes an outer gear ring 181, an inner gear ring 182 and a second transmission shaft 183. The outer wall of the outer gear ring 181 is fixedly connected to the inner wall of one end of the magnetic ring 131, and the inner wall is provided with a plurality of meshing teeth along the circumferential direction. The inner gear ring 182 is arranged inside the outer gear ring 181, and is eccentrically arranged with the outer gear ring 181, and a plurality of meshing teeth are arranged on the outer wall. The meshing teeth at the bottom of the inner gear ring 182 are meshed and connected with the meshing teeth at the bottom of the outer gear ring 181. A crossbeam is arranged inside the inner gear ring 182. One end of the second transmission shaft 183 is fixedly connected to the middle part of the inner gear ring 182 through the crossbeam, and the other end is fixedly connected to the first transmission shaft 170. The rotor 130 can drive the impeller 120 to rotate through the outer gear ring 181, the inner gear ring 182, the second transmission shaft 183 and the first transmission shaft 170. The impeller 120 can drive the rotor 130 to rotate through the first transmission shaft 170, the second transmission shaft 183, the inner gear ring 182 and the outer gear ring 181.

In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims (10)

1. A turboshaft engine starting structure, characterized by comprising:

one end of the air inlet pipe is provided with an air inlet, the other end is an air outlet;

The impeller is rotatably arranged in the air outlet; a first air flow passage and a second air flow passage are formed on the impeller;

the rotor is arranged on the impeller and can drive the impeller to rotate or rotate along with the impeller;

And the stator is arranged in the rotor.

2. The starting structure for a turboshaft engine according to claim 1, wherein a receiving groove is formed in a middle portion of the impeller; the rotor and the stator are arranged in the accommodating groove; the second air flow passage is communicated with the accommodating groove.

3. The turboshaft engine starting structure of claim 1 further comprising:

the flow guide head is fixedly arranged in the air inlet; the stator is detachably connected with the flow guide head through a connecting assembly.

4. A turboshaft engine starting structure in accordance with claim 3 wherein said connection assembly comprises:

one end of the locking screw is fixed on the flow guiding head;

the locking sleeve is sleeved outside the locking screw, one end of the locking sleeve is abutted to the flow guide head, and a plurality of expansion grooves are formed in the circumferential direction at one end of the locking sleeve, which is far away from the flow guide head; the stator is sleeved outside one end, far away from the flow guide head, of the locking sleeve;

the locking nut is in threaded connection with the locking screw is far away from the one end of water conservancy diversion head, the outer wall with locking sleeve is kept away from the inner wall laminating of the one end of water conservancy diversion head.

5. The starter structure for a turboshaft engine according to any one of claims 1 to 4, characterized in that the diameter of the middle portion of the intake pipe is smaller than the diameter of the intake port and the diameter of the exhaust port, respectively.

6. The turboshaft engine starting structure of any one of claims 1 to 4 wherein the air intake pipe comprises:

a first pipe section;

and one end of the second pipe section is detachably connected with the first pipe section.

7. The turboshaft engine starting structure of any one of claims 1 to 4 wherein the rotor comprises:

the magnetic ring is fixedly arranged on the impeller;

the magnetic strips are uniformly arranged in the magnetic ring along the circumferential direction of the magnetic ring.

8. The turboshaft engine starting structure of any one of claims 1 to 4 wherein the stator comprises:

a stator core;

And the stator winding is arranged on the stator core.

9. The turboshaft engine starting structure of any one of claims 1 to 4 further comprising:

and one end of the first transmission shaft is detachably connected with the impeller.

10. The turboshaft engine starting structure of any one of claims 1 to 4 further comprising:

The speed regulator is arranged on the impeller and the rotor; when the rotor drives the impeller to rotate, the speed regulator is used for increasing the rotating speed of the impeller; the speed regulator is used for reducing the rotating speed of the rotor when the rotor rotates along with the impeller.