An aircraft airborne power distribution box

Abstract

This utility model belongs to the field of aviation technology and discloses an airborne power distribution box. The airborne power distribution box is composed of a panel assembly, a busbar assembly, a printed circuit board assembly, a box assembly, a backplate assembly, and multiple electrical connectors. The panel assembly is located on the upper surface of the box assembly, the backplate assembly is located on the lower surface of the box assembly, the busbar assembly is located below the panel assembly and inside the box, the printed circuit board assembly is located above the backplate assembly and inside the box, and the multiple electrical connectors are located on the side of the box assembly, making full use of the power distribution box space and achieving a reasonable layout.

Description

Technical Field

[0001] This utility model belongs to the field of aviation technology, and in particular relates to an airborne power distribution box for aircraft. Background Technology

[0002] As a key component of the aircraft's electrical system, the airborne power distribution box plays a crucial role in rationally distributing the electrical energy generated by the power source to various electrical devices.

[0003] A distribution box typically consists of a power distribution device, a protection device, and wires. Traditional power distribution often uses discrete mechanical circuit breakers, which have a loose layout, occupy a lot of space, require a lot of time for installation and maintenance, and also affect the reliability of the circuit breakers. Utility Model Content

[0004] The technical problem solved by this utility model is to provide an airborne power distribution box that uses various types of circuit breakers and uses busbars inside as components to connect the circuit breakers and collect current. It makes full use of the power distribution box space, has a reasonable layout, and can accommodate a large number of circuit breakers on the panel. It also has reserved expansion keys so that circuit breakers can be easily replaced when the system needs to be expanded.

[0005] The technical solution of this utility model: An airborne power distribution box for aircraft, the airborne power distribution box comprising a panel assembly, a busbar assembly, a printed circuit board assembly, a box assembly, a backplate assembly, and multiple electrical connectors; The panel assembly is located on the upper surface of the housing assembly, the back panel assembly is located on the lower surface of the housing assembly, the busbar assembly is located below the panel assembly and inside the housing, the printed circuit board assembly is located above the back panel assembly and inside the housing, and multiple electrical connectors are located on the side of the housing assembly.

[0006] Furthermore, the busbar assembly includes multiple independent busbars, and various types of circuit breakers are mounted on the panel and connected to the busbars.

[0007] Furthermore, the input terminals of multiple independent busbars and the output terminals of all circuit breakers are connected to electrical connectors via wires.

[0008] Furthermore, the panel assembly, housing assembly, and back panel assembly are all machined from aerospace-grade aluminum.

[0009] Furthermore, the circuit breakers on the panel assembly are arranged in zones according to the input busbars they are connected to, and extension keys are provided for installing black blank circuit breakers on the extension keys.

[0010] Furthermore, the busbar in the busbar assembly is formed by wire cutting of copper plate and silver plating on the surface.

[0011] Furthermore, the box assembly is a detachable box-type structure.

[0012] This utility model's technical solution, through a unique structural design, solves the problems of inconvenient installation and maintenance, and large space occupation found in existing airborne power distribution boxes. The circuit breakers on the panel are arranged in zones according to the connected input busbars, with expansion keys provided. The busbars are fixed by screws on two rows of circuit breaker input pins, and the busbars are also equipped with oblong holes. Compared to traditional busbars, this reduces weight and size, thereby reducing the weight of the power distribution box. Attached Figure Description

[0013] Figure 1 This is a schematic diagram illustrating the working principle of the aircraft airborne power distribution box of this utility model; Figure 2 This is a three-dimensional layout diagram of the airborne power distribution box of this utility model; Figure 3 This is an exploded view of the structure of the airborne power distribution box of this utility model; Figure 4 This is an exploded view of the panel assembly structure of the aircraft airborne power distribution box of this utility model; Figure 5 This is a structural diagram of the busbar of the airborne power distribution box of this utility model; Figure 6 This is a schematic diagram of the box assembly structure of the airborne power distribution box of this utility model; Figure 7 This is a schematic diagram of the backplate assembly structure of the aircraft airborne power distribution box of this utility model. Detailed Implementation

[0014] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings.

[0015] This utility model provides an airborne power distribution box that integrates all circuit breakers, has a reasonable layout, is easy to maintain, and has high reliability. It provides 28V power to the onboard electrical loads and has short-circuit and overcurrent protection functions.

[0016] The aircraft-borne power distribution box adopts a modular design to meet the requirements of product interchangeability and maintainability. It mainly consists of a panel assembly, busbar assembly, printed circuit board assembly, box assembly, backplane assembly, and electrical connectors. Its specific working principle is as follows: (1) The airborne power distribution box contains three independent busbars, namely NO.21, NO.31 and NO.32. A certain number of circuit breakers are connected to the NO.21, NO.31 and NO.32 busbars. All circuit breakers are installed on the panel. The busbar input and the output of each circuit breaker are connected to the electrical connector through wires.

[0017] (2) The airborne power distribution box includes a printed circuit board on which voting diodes and voltage sensing resistors are mounted. The diodes serve to prevent reverse current. The outputs of the two circuit breakers are each connected to the positive terminal of one of the diodes, and the negative terminals of the two diodes are connected together to output to the connector. One end of the voltage sensing resistor is connected to the busbar, and the other end is connected to the connector output to detect the voltage of the busbar. The metal heat sink of the voting diode is close to the left side plate of the housing. The exterior of the housing is milled with heat dissipation teeth to increase the effective heat dissipation area and improve the working stability of the voting diode.

[0018] Figure 1 This is a block diagram of the working principle of the power distribution box. The DC power supply on the machine is controlled by the circuit breaker switch on the product panel assembly. The circuit breaker has overcurrent and short circuit protection functions.

[0019] Figure 2 This is a 3D layout diagram of the power distribution box, which mainly consists of a housing, multiple circuit breakers, and four connectors.

[0020] Figure 3 This is an exploded view of the distribution box structure. The distribution box structure design is divided into: panel assembly design, busbar design, box body design, and back panel design. Removing the back panel exposes the internal components, facilitating maintenance. All circuit breakers are mounted on the panel and connected to sockets on the box body via busbars and wires. The panel, box body, and back panel are all machined from aviation-grade 2A12-T4 aluminum, and after precision machining, undergo aluminum-based conductive anodizing surface treatment. Exposed surfaces of parts are first sprayed with QH-15 anti-corrosion epoxy primer, followed by QFS-15 weather-resistant polyurethane enamel paint.

[0021] Figure 4 This is an exploded view of the panel assembly structure. The circuit breakers on the panel are arranged according to the input busbars they are connected to, with reserved expansion keys. These reserved keys are fitted with blank black circuit breakers, allowing for easy replacement when additional circuit breakers are needed for system expansion. The panel layout follows the design principle of ensuring a basic balance of current in each branch of the busbar, thus simplifying the busbar design.

[0022] Figure 5 The diagram shows the structure of the busbar. The busbar is made of copper plate by wire cutting and silver plating to improve conductivity. The dimensions of each part of the busbar are determined according to the maximum current capacity, with the cross-sectional area determined based on the current carrying capacity of 5.5A / mm2.

[0023] Figure 6This is a structural diagram of the housing, which consists of an upper plate, lower plate, left side plate, and right side plate. The housing is designed as a detachable box-type structure, with the left and right side plates featuring an embedded connection, ensuring both product strength and improved sealing. Each component is CNC milled, with internally milled strength ribs to guarantee housing strength and high machining precision. Voting diodes are mounted on the side plate assemblies, with the diodes closely attached to the components. Heat sinks are milled onto the exterior of the components to increase the effective heat dissipation area and improve the operational stability of the voting diodes. A layer of thermally conductive silicone grease is applied to the contact surface between the components and the heat sink, allowing for more effective heat conduction from the components to the heat sink. A grounding wire metal grounding post is designed on the housing for grounding.

[0024] Figure 7 The diagram shows the structure of the backplate assembly. The backplate is milled from a single piece of aluminum alloy and has internal reinforcing ribs. The backplate is fastened to each support assembly with four screws, and the M6 ​​self-locking nuts on the support are connected to the aircraft fuselage with screws.

[0025] Through a unique structural design, the problems of inconvenient installation and maintenance, and large space occupation of existing airborne power distribution boxes are solved. The circuit breakers on the panel are arranged in sections according to the connected input busbars, and expansion keys are provided. The busbars are fixed by screws on two rows of circuit breaker input pins. The busbars are also equipped with oblong holes, which reduces weight and size compared to traditional busbars, thereby reducing the weight of the power distribution box.

Claims

1. An airborne power distribution box for aircraft, characterized in that, The airborne power distribution box consists of a panel assembly, a busbar assembly, a printed circuit board assembly, a box assembly, a backplane assembly, and multiple electrical connectors. The panel assembly is located on the upper surface of the housing assembly, the back panel assembly is located on the lower surface of the housing assembly, the busbar assembly is located below the panel assembly and inside the housing, the printed circuit board assembly is located above the back panel assembly and inside the housing, and multiple electrical connectors are located on the side of the housing assembly.

2. The airborne power distribution box according to claim 1, characterized in that, The busbar assembly comprises multiple independent busbars, and various types of circuit breakers are mounted on the panel and connected to the busbars.

3. An airborne power distribution box according to claim 2, characterized in that, The input terminals of multiple independent busbars and the output terminals of all circuit breakers are connected to electrical connectors via wires.

4. An airborne power distribution box according to claim 1, characterized in that, The panel assembly, housing assembly, and back panel assembly are all machined from aerospace-grade aluminum.

5. An airborne power distribution box according to claim 2, characterized in that, The circuit breakers on the panel assembly are arranged according to the input busbars they are connected to, and extension keys are provided. Black blank circuit breakers are installed at the extension keys.

6. An airborne power distribution box according to claim 2, characterized in that, The busbar in the busbar assembly is made of copper plate by wire cutting and silver plating.

7. An airborne power distribution box according to claim 2, characterized in that, The box assembly is a detachable box-type structure.

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