Leading-out wire cooling device for engine caudal vertebra built-in high-temperature motor

Abstract

The embodiment of the invention discloses a leading-out wire cooling device for a built-in high-temperature motor of an engine caudal vertebra, relates to the technical field of aviation motors, and can realize motor leading-out wire installation in a compact high-temperature environment of the engine caudal vertebra. The motor is characterized in that an outgoing line outside the motor is connected with an internal armature winding in a welding manner and is led out from an oil inlet in a front end cover of the motor. The outgoing line is soaked in the motor cooling oil pipe and penetrates through the engine caudal vertebra supporting plate through the oil inlet pipeline. The oil pipe is connected with a three-way adapter and a static sealing junction box which are installed on the outer side of the supporting plate, and an outgoing line is connected with an outer high-temperature-resistant cable through a binding post on the junction box, so that oil-electricity separation is achieved. The complete pipeline design of the motor outgoing line in the caudal vertebra high-temperature installation environment is achieved, the advantage that the turning radius of a conventional motor wire is small is fully utilized, the current-carrying capacity of the motor is remarkably improved by combining the direct oil immersion cooling mode of the outgoing line, and the high electric load requirement of an aviation high-power motor can be met.

Description

Technical Field

[0001] This invention relates to the field of aviation electrical technology, and in particular to a lead wire cooling device for a high-temperature motor built into the tail cone of an engine. Background Technology

[0002] Built-in motor technology eliminates the complex accessory drive housing and central drive system, making the engine structure more compact and integrated; it reduces the engine's frontal area, optimizing the aircraft's aerodynamic characteristics; and it simplifies the hydraulic lines used for motor lubrication and cooling, reducing system complexity and leakage risks. The built-in motor can be installed in different positions on the engine. A typical location for high-pressure shaft power extraction is the compressor's cold air side, while a typical location for low-pressure shaft power extraction is inside the tail cone. The compressor's cold air side has a relatively low ambient temperature, ranging from 100 to 300°C depending on the engine. Installing the motor in the engine tail cone offers the advantage of easy installation and removal, meeting accessibility maintenance requirements, but the ambient temperature reaches 400–700°C or even higher. With the increasing demand for power supply, single high-pressure shaft power extraction will not meet actual needs. Therefore, it is necessary to conduct overall structural integration demonstrations, design, and power extraction tests for tail cone-mounted motors to provide technical accumulation and guidance for the feasibility of low-pressure shaft power extraction.

[0003] When a motor is installed at the tail cone and operates as a generator, highly reliable electrical cables are crucial for ensuring stable power transmission. Currently, commonly used motor winding conductors are covered with polyimide film, with a long-term temperature resistance generally not exceeding 240℃. Existing electrical cables with a temperature resistance exceeding 300℃ typically consist of multiple layers of materials, including nickel-plated copper / pure nickel conductors, PTFE / ceramic mica wrapping tape, fiberglass winding, and a high-temperature outer sheath coating. The ratio of cable bending radius to conductor diameter reaches 15-25. Without cooling measures for the motor lead-out cables, the cable's current carrying capacity is relatively low, approximately 2-4 A / mm². 2 In such cases, large-diameter cables must be selected as the power lines for high-power motors. Therefore, high-temperature cables have poor flexibility, are difficult to bend, and have a large turning radius, making them unsuitable for direct installation in the tail section space.

[0004] In summary, the high-temperature tail cone installation environment with limited space poses challenges to the reliable operation of the built-in motor. Therefore, while optimizing the structure and load matching design of the motor-generator integrated system, improving the corresponding lead-out lines and cooling pipes to enhance its current-carrying capacity and meet the high electrical load requirements of high-power aviation motors has become a research topic. Summary of the Invention

[0005] The embodiments of the present invention provide a lead wire cooling device for a high-temperature motor built into the tail cone of an engine, which can realize the lead wire of the motor winding in the high-temperature installation environment of the tail cone, while providing an oil immersion cooling working environment for the lead wire and significantly improving its current carrying capacity, thus meeting the high electrical load requirements of high-power motors in aviation.

[0006] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions: A lead wire cooling device for a high-temperature motor built into the engine tail cone includes: motor winding lead wires, terminals, a junction box, a junction box base, an oil-electric separation tee, a straight oil pipe, an L-shaped oil pipe, and a pipe fitting nut; one end of the L-shaped oil pipe is connected to the motor oil inlet, and the other end is connected to the straight oil pipe; the straight oil pipe passes through a support plate installed in the tail cone and is fixed through a limiting hole; the straight oil pipe is connected to one opening of the oil-electric separation tee, and the other two openings of the oil-electric separation tee are respectively connected to the junction box base and the oil pump pipe; the junction box and the junction box base are fixed on the junction box mounting seat of the engine turbine rear casing, and terminals are installed on the junction box for connecting the lead wires to the external cable to realize generator power output.

[0007] In this embodiment, the motor oil inlet and outlet are designed to align with the support plate in the circumferential direction of the front cover. The motor oil inlet and outlet are connected to the cooling oil circulation system via L-shaped and straight oil pipes of their respective lead-out cooling devices. The lead-out wire of the built-in motor exits from the motor oil inlet. The oil return chamber connects to the oil return port on the front cover via the oil return groove from the space at the non-drive end of the motor, thus eliminating the need for lead-out wires.

[0008] The radial position of the motor oil inlet on the front cover should match the position of the motor winding lead wire inside the housing; so that during the assembly of the motor assembly with the built-in motor, after the internal winding of the motor has completed the shaping process, the straight-out position of the motor winding lead wire can be directly connected to the motor oil inlet, thereby reducing the assembly difficulty.

[0009] In this embodiment, the built-in motor for the engine tail cone is an electrically excited double salient pole motor, and the winding is made of rectangular flat wire; the electrically excited double salient pole motor has two sets of windings, including an armature winding and an excitation winding, and the internal windings of the motor are cooled by immersion in oil; the front end cover of the built-in motor and the conical oil sleeve form an oil cavity for the motor end winding, which is connected to the external cooling oil pipe and is sealed by an O-ring.

[0010] Furthermore, the motor winding leads should be distributed to one or more motor oil inlets to improve the ease of assembly while ensuring the oil intake capacity of the end space. Specifically, the motor winding leads should exit from at least one motor oil inlet, thus occupying a portion of the cross-sectional area of ​​the inlet. Alternatively, the motor winding leads can exit from two motor oil inlets. The preferred solution is to set two motor oil inlets, taking into account constraints of the lubricating oil and cooling oil circulation system such as oil pump pressure and oil supply volume, and verifying the oil intake capacity of the end space. The distribution of leads also helps reduce the complexity of the assembly process.

[0011] In this embodiment, the L-shaped oil pipe is fixed to the built-in motor housing by a pipe joint nut; the cool air from the engine's external bypass duct flows through the support plate over the surface of the cooling oil pipe, then flows into the gap between the engine tail cone housing and the built-in motor housing, and then flows out from the tail cone hole and merges into the internal high-temperature airflow. The cool air can be used to cool the oil inlet pipe and the oil outlet pipe, while reducing the operating temperature of the built-in motor and improving the reliability of motor operation.

[0012] A support plate is installed every 60° on the rear casing of the engine turbine to provide structural support; the interior of the support plate is hollow and has cooling oil pipes arranged inside, with two cooling oil pipes serving as oil inlets and the other as an oil outlet.

[0013] The present invention provides a lead wire cooling device for an internal motor in an engine tail cone. The external lead wire of the motor is connected to the internal armature winding by welding and exits from the motor oil inlet on the front cover of the motor. The lead wire is immersed in the motor cooling oil pipe and passes through the engine tail cone support plate via the oil inlet pipe. The oil pipe connects to a tee adapter and a statically sealed junction box installed on the outside of the support plate. The lead wire is connected to an external high-temperature resistant cable through the terminals on the junction box, thereby achieving oil-electric separation. This invention achieves a complete pipeline design for the motor lead wire in the high-temperature installation environment of the tail cone, fully utilizing the advantage of the small turning radius of conventional motor wires, and significantly improving its current-carrying capacity by combining the direct oil immersion cooling method of the lead wire, thus meeting the high electrical load requirements of high-power aviation motors. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 is a schematic diagram of the lead-out cooling structure of an exemplary embodiment of the present invention.

[0016] Figure 2 is a schematic cross-sectional view of the engine tail cone built-in high-temperature motor system of an exemplary embodiment of the present invention;

[0017] Figure 3 is a schematic side view of the engine tail cone built-in high-temperature motor system of an exemplary embodiment of the present invention;

[0018] Figure 4 is an internal structural diagram of the high-temperature motor system built into the engine tail cone in an exemplary embodiment of the present invention;

[0019] Figure 5 is a schematic diagram of the lead wire cooling structure and motor connection method of an exemplary embodiment of the present invention;

[0020] Component labels in the diagram: 101-Engine turbine rear casing; 102-Support plate; 103-Oil inlet pipe; 104-Oil outlet pipe; 105-Junction box mounting base; 106-Engine tail cone; 201-Terminal post; 202-Junction box; 203-Junction box base; 204-Oil-electric separation tee connector; 205-Straight oil pipe; 206-L-shaped oil pipe; 207-Pipe fitting nut; 208-Oil pipe adapter; 209-Motor winding lead wire; 301-Internal motor housing; 302-Internal motor winding; 303-Motor stator; 304-Motor oil inlet; 305-Conical oil sleeve; 306-Motor oil outlet. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Embodiments of the present invention will be described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in the specification of the present invention means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or couplings. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the meaning consistent with their meaning in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0022] In the specific solutions provided in the embodiments of the present invention, such as Figure 1 As shown, the cooling device for the lead wires of the built-in motor in the engine tail cone includes:

[0023] The system includes a motor winding lead wire 209, a terminal block 201, a junction box 202, a junction box base 203, an oil-electric separation tee connector 204, a straight oil pipe 205, an L-shaped oil pipe 206, and a pipe fitting nut 207. One end of the L-shaped oil pipe 206 is connected to the motor oil inlet, and the other end is connected to the straight oil pipe 205. The straight oil pipe passes through the tail cone support plate 102 and is fixed through a limiting hole. The straight oil pipe 205 is connected to the oil-electric separation tee connector 204, and the other two openings of the tee connector are connected to the oil pump pipe and the junction box base 203, respectively. The junction box 202 and the junction box base 203 are fixed to the junction box mounting seat 105 on the engine turbine rear casing 101. The terminal block 201 installed on the junction box 202 is used to connect the lead wire to the external cable to realize the generator's electrical output. As a preferred option, the terminal block 201 can be directly selected as a standard aviation electrical connector that meets the requirements of the operating environment.

[0024] Furthermore, the lead-out cooling structure provided in this embodiment includes multiple cooling oil pipes of different sizes. Appropriate liquid sealing methods should be used at the oil pipe connection points, such as selecting hydraulic pipe fittings that meet standard requirements and using O-rings or other sealing components. During the assembly of the built-in motor, lead-out cooling structure, and engine turbine rear casing 101, the installation sequence should be determined based on actual spatial constraints. In this embodiment, the installation sequence is: built-in motor, L-shaped oil pipe 206, straight oil pipe 205, oil-electric separation tee connector 204, and junction box base 203. To facilitate the lead-out wire passing through the L-shaped oil pipe, the turning radius of the L-shaped oil pipe should be determined by considering structural parameters such as the axial distance between the motor front cover and the support plate limiting hole, the inner diameter of the oil pipe, and the lead-out wire profile.

[0025] like Figure 2 and Figure 3 As shown, the built-in motor is installed within the engine tail cone space. Support plates 102 are designed at regular angles on the engine turbine rear casing 101 to provide structural support. The hollow interior of the support plates 102 facilitates pipe arrangement. In this embodiment, there is a support plate 102 every 60°, with cooling oil pipes arranged in the three support plates: two inlet pipes 103 and one outlet pipe 104. Cooling air from the engine's external bypass duct flows through the support plates 102, across the surface of the cooling oil pipes, into the gap between the engine tail cone housing and the built-in motor housing 301, and then flows out from the tail cone hole into the high-temperature airflow inside. This cooling air can be used to cool the inlet oil pipes, reducing the operating temperature of the motor and improving its operational reliability. The support plates are mostly made of lightweight, high-strength materials. As a preferred option, in this embodiment, cooling air flows through the support plates; in non-extreme high-temperature environments, titanium alloy can be used.

[0026] like Figure 4 As shown, in this embodiment, the motor uses oil cooling, and the cooling oil circulation system is a lubricating oil circulation system, which has good system integration. The internal oil circuit of the motor is connected to the cooling oil circulation system through a combination oil pipe.

[0027] Furthermore, the motor oil inlet 304 and motor oil outlet 306 of the built-in motor are located on the front end cover of the housing, and their circumferential positions are designed to match the direction of the support plate. If the motor winding lead 209 outlet reuses either the motor oil inlet 304 or the motor oil outlet 306, then its radial position should match the position of the winding lead inside the housing, as can be referenced. Figure 5After the winding has completed the shaping process, the straight-out position of the lead wire matches the outlet, facilitating motor assembly. In this embodiment, the motor lead wire only exits from the motor oil inlet 304. The oil return chamber connects to the motor oil outlet 306 on the front cover via the oil return groove from the non-drive end space of the motor, but is not connected to the end space on the lead wire side. Therefore, the motor oil outlet 306 is not used as the lead wire outlet. The motor oil outlet pipe includes a straight oil pipe 205, an L-shaped oil pipe 206, and an oil pipe adapter 208. The oil-electric separation tee 204 and the oil pipe adapter are both adapters. The oil pipe adapter 208 connects the return oil circuit to the cooling oil circulation system.

[0028] Furthermore, the lead-out line occupies part of the motor oil inlet area, and should be allocated to one or more motor oil inlets. This solution sets two motor oil inlets 304. Combined with the constraints of the lubricating oil and cooling oil circulation system, such as oil pump pressure and oil supply volume, the oil inlet capacity of the end space is checked. At the same time, allocating the lead-out line to different outlets also helps to reduce the complexity of the assembly process.

[0029] Furthermore, one side of the cooling oil pipe is connected to the motor oil inlet 304 and the motor oil outlet 306, and the other side is connected to the engine turbine rear casing 101. As a preferred embodiment, a limiting hole is designed on the casing to prevent circumferential displacement of the oil pipe. Radial displacement of the oil pipe can be limited by structures such as bosses. At the same time, a junction box mounting base 105 is designed on the outside of the engine turbine rear casing 101.

[0030] When selecting the type of built-in motor to be installed in the engine tail cone space, the constraints of the tail cone space on the motor's external dimensions must be considered. The availability of a cooling source and the location of cooling pipe interfaces must be confirmed. The design of the motor winding lead-out positions must match the tail cone structure. In this embodiment, the built-in motor adopts an electrically excited doubly salient pole motor topology, with rectangular flat wire windings. The motor's front end cover and the conical oil sleeve 305 form the motor end winding oil cavity, which is connected to the external cooling oil pipe and sealed with an O-ring.

[0031] This lead-out cooling structure is also applicable to situations where the built-in motor is located in other parts of the engine. By reusing the liquid cooling pipeline and the lead-out installation space, the lead-out can obtain good cooling and heat dissipation conditions, solving the problem that high-temperature cables with large bending radii are difficult to apply in limited spaces, and achieving a more compact engine-built-in motor architecture.

[0032] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on its differences from other embodiments. In particular, the device embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. The above descriptions are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A lead wire cooling device for a high-temperature motor built into the tail cone of an engine, characterized in that, include: Motor winding lead wire (209), terminal block (201), junction box (202), junction box base (203), oil-electric separation tee connector (204), straight oil pipe (205), L-shaped oil pipe (206) and pipe connector nut (207); One end of the L-shaped oil pipe (206) is connected to the motor oil inlet, and the other end is connected to the straight oil pipe (205); The straight oil pipe (205) passes through the support plate (102) installed in the tail cone and is fixed through the limiting hole; The straight oil pipe (205) is connected to one opening of the oil-electric separation tee connector (204), and the other two openings of the oil-electric separation tee connector (204) are connected to the junction box base (203) and the oil pump oil pipe, respectively. The junction box (202) and junction box base (203) are fixed on the junction box mounting base (105) of the engine turbine rear casing (101), and the terminal block (201) is installed on the junction box (202).

2. The lead wire cooling device for a high-temperature motor built into the engine tail cone according to claim 1, characterized in that, The motor oil inlet (304) and motor oil outlet (306) are aligned with the support plate in the circumferential position of the front end cover so that the cooling oil pipe can pass through the support plate. The motor oil inlet (304) and motor oil outlet (306) are connected to the cooling oil circulation system through the L-shaped oil pipe (206) and straight oil pipe (205) of their respective lead-out cooling devices. The lead wire of the built-in motor passes through the motor oil inlet (304).

3. The lead wire cooling device for a high-temperature motor built into the engine tail cone according to claim 1, characterized in that, The radial position of the motor oil inlet (304) on the front end cover should match the position of the motor winding lead (209) inside the housing; so that during the assembly of the built-in motor, after the internal winding (302) of the motor has completed the shaping process, the straight position of the motor winding lead (209) is directly connected to the motor oil inlet (304).

4. The lead wire cooling device for a high-temperature motor built into the engine tail cone according to claim 1, characterized in that, The built-in motor for the engine tail cone is an electrically excited double salient pole motor, and the winding is made of rectangular flat wire; the electrically excited double salient pole motor has two sets of windings, including an armature winding and an excitation winding, and the internal winding (302) of the motor is cooled by immersion in oil. The built-in motor front end cover and the conical oil sleeve (305) form the motor end winding oil cavity. The motor end winding oil cavity is connected to the external cooling oil pipe and is liquid sealed by an O-ring.

5. The lead wire cooling device for a high-temperature motor built into the engine tail cone according to claim 2, characterized in that, The motor winding lead (209) passes through at least one motor oil inlet (304), thereby occupying a portion of the cross-sectional area of ​​the motor oil inlet (304).

6. The lead wire cooling device for a high-temperature motor built into the engine tail cone according to claim 5, characterized in that, The motor winding leads (209) pass through the two motor oil inlets (304).

7. The lead wire cooling device for a high-temperature motor built into the engine tail cone according to claim 1, characterized in that, The L-shaped oil pipe (206) is fixed to the built-in motor housing (301) by the pipe fitting nut (207); The cool air from the engine's external bypass duct flows over the surface of the cooling oil pipe through the support plate (102), then flows into the gap between the engine tail cone housing and the internal motor housing (301), and then flows out from the tail cone hole and merges into the internal high-temperature airflow.

8. The lead wire cooling device for a high-temperature motor built into the engine tail cone according to claim 7, characterized in that, A support plate (102) is provided every 60° on the rear casing of the engine turbine for providing structural support. The support plate (102) is hollow inside and has cooling oil pipes arranged inside, two of which are used as oil inlet pipes (103) and the other is used as oil outlet pipe (104).

Images