Airborne 28V DC power distribution device

Abstract

An airborne 28V direct current power distribution device belongs to the technical field of electrical equipment and comprises binding posts K1 and K2, an electric connector, a circuit breaker, a bus bar, a diode, a contactor and a heat dissipation bus bar, the binding post K1 is connected with a normally open contact of the contactor, the binding post K2 is connected with a normally closed contact of the contactor, and the diode is connected with the heat dissipation bus bar. The tail end of the electric connector is connected with the other end of the circuit breaker, the positive end and the negative end of a contactor coil are connected with the tail end of the electric connector, hole sites, connected with the positive end and the negative end of the contactor coil, of the electric connector are connected with an upper computer, and other hole sites are connected with rear-end power distribution points. One end of the diode is connected with the electric connector, and the other end is connected with the contactor coil positive end. The device provided by the invention can provide 28V direct current for a plurality of airborne equipment and provide power distribution protection.

Description

Technical Field

[0001] The invention belongs to the technical field of electrical equipment, and in particular relates to an airborne 28V direct current power distribution device. Background Art

[0002] The DC power distribution device is used to provide low-voltage DC power distribution to some electrical equipment on the aircraft. By controlling the action of the contactor coil, it can supply power to the onboard electrical equipment. The functions of onboard electrical equipment are different in different stages of flight. Different load management can be implemented in different stages such as cruising, combat, take-off, and landing.

[0003] Traditional aircraft power supply systems are mainly composed of generators, transformers, etc., which generally have some defects, such as high equipment complexity, heavy weight, and difficult maintenance. In addition, with the continuous upgrading and development of aircraft, the number of onboard electrical equipment continues to increase, and the existing low-voltage DC distribution devices can no longer meet the load requirements of electrical equipment. Summary of the invention

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an airborne 28V DC power distribution device, the purpose of which is to solve the problems that the existing equipment is highly complex, heavy, difficult to maintain, and the load capacity does not meet the use requirements of airborne electrical equipment.

[0005] In order to achieve the above object, the main technical solutions adopted by the present invention include: An airborne 28V DC power distribution device comprises terminals K1 and K2, an electrical connector, a circuit breaker, a bus bar, a diode, a contactor and a heat dissipation bus bar, wherein the terminal K1 is connected to a normally open contact of the contactor, the terminal K2 is connected to a normally closed contact of the contactor, the other end of the contact of the contactor is connected to the bus bar through a wire and then connected to the circuit breaker, the rear end of the electrical connector is connected to the other end of the circuit breaker, the positive and negative ends of the contactor coil are connected to the rear end of the electrical connector, the hole position connecting the electrical connector to the positive and negative ends of the contactor coil is connected to a host computer, and the remaining hole positions are connected to a rear-end power distribution point, one end of the diode is connected to the electrical connector, and the other end is connected to the positive end of the contactor coil.

[0006] Furthermore, the other end of the contact of the contactor is connected to a heat dissipation bus bar, and the heat dissipation bus bar is connected to the circuit breaker through a bus bar.

[0007] Furthermore, the terminals K1, K2, electrical connectors, circuit breakers, bus bars, diodes, contactors, and heat dissipation bus bars are integrated in a box, an upper cover is provided above the box, a lower cover is provided below the box, the circuit breaker is arranged vertically, and the circuit breaker button is arranged upward.

[0008] Furthermore, the upper cover is a transparent polycarbonate plate.

[0009] Furthermore, the circuit breaker is a vertically mounted push-pull type free-tripping circuit breaker, and the specifications of the circuit breaker are selected according to the current of the rear-end electrical equipment and a 75% derating.

[0010] Furthermore, a vibration isolator is provided on the ear piece of the box body for vibration isolation from the position to be connected.

[0011] The beneficial effects of the present invention are as follows: the airborne 28V DC power distribution device of the present invention can be implemented to provide 28V DC power to multiple airborne devices and provide power distribution protection. The device of the present invention is easy to maintain, and a general detection device can be used to detect whether the correctness of the internal logical relationship of the present invention meets the requirements and locate the fault position of the present invention. The components of the present invention are small in weight and easy to carry, and can meet the requirements of disassembly and assembly on the use site and the requirements of base-level maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the connection principle of the airborne 28V DC power distribution device of the present invention; Figure 2 This is an overall external schematic diagram of the airborne 28V DC power distribution device of the present invention; Figure 3 It is an exploded view of the structure of the airborne 28V DC power distribution device of the present invention; Figure 4 The figure is a schematic diagram showing the wiring relationship principle of the airborne 28V DC power distribution device of the present invention.

[0013] In the figure: 1 is K1 terminal, 2 is K2 terminal, 3 is electrical connector, 4 is circuit breaker, 5 is bus bar, 6 is diode bracket, 7 is contactor, 8 is heat dissipation bus bar, 9 is housing, 10 is upper cover, 11 is lower cover, and 12 is vibration isolator. DETAILED DESCRIPTION

[0014] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0015] The present invention provides an airborne 28V DC power distribution device, such as Figure 1-4As shown, it includes K1 terminal 1, K2 terminal 2, electrical connector 3, circuit breaker 4, bus bar 5, diode, contactor 7, and heat dissipation bus bar 8. The K1 terminal 1 is connected to the normally open contact of contactor 7, and the K2 terminal 2 is connected to the normally closed contact of contactor 7. The other end of the contact of contactor 7 is connected to bus bar 5 through a wire and then connected to circuit breaker 4. Specifically, the other end of the contact of contactor 7 is connected to heat dissipation bus bar 8, and heat dissipation bus bar 8 is connected to circuit breaker 4 through bus bar 5. Heat dissipation bus bar 8 is used for internal wire pressing of the product. The tail end of electrical connector 3 is connected to the other end of circuit breaker 4, the positive and negative ends of contactor 7 coil are connected to the tail end of electrical connector 3, the hole position where electrical connector 3 connects to the positive and negative ends of contactor 7 coil is connected to the host computer, and the other holes are connected to the rear-end power distribution point. One end of the diode is connected to electrical connector 3, and the other end is connected to the positive end of contactor 7 coil. At this time, the external 28V power supply signal is respectively loaded onto the two terminals K1 and K2 of the device, and K1 and K2 are respectively connected to the normally open contact and the normally closed contact of the main contact of the contactor 7 inside the device, and the other end of the normally open contact and the normally closed contact is connected to the circuit breaker 4 inside the device, and is connected to the corresponding interface of the electrical connector 3 of the device after the circuit breaker 4 performs overload protection. The function of the circuit breaker 4 is to perform overcurrent protection on the rear-end electrical equipment. When the current exceeds the rated load current of the rear-end electrical equipment itself, the circuit breaker 4 will automatically trip according to its own protection characteristics and stop the power supply to the rear-end electrical equipment. The device controls the closing or disconnection of the contactor 7 inside the device through an external control signal. If the contactor is closed, the product takes power from K1, and if the contactor 7 is not closed, the product takes power from K2, so as to realize that the product provides 28V DC power supply to some electrical equipment on the aircraft. The present invention selects a DC contactor by controlling the selection of components, and is suitable for 28V DC power distribution of aircraft power distribution system.

[0016] Specifically, the K1 terminal 1, K2 terminal 2, electrical connector 3, circuit breaker 4, bus bar 5, diode, contactor 7, and heat dissipation bus bar 8 are integrated in a box, an upper cover 10 is provided on the top of the box, a lower cover 11 is provided below the box, and a shell is provided in the middle of the box. The upper cover 10, shell 9, and lower cover 11 are assembled together to form a box structure. The circuit breaker 4 is arranged in a vertical direction and fixed on the shell 9, and the button of the circuit breaker 4 is arranged upward. The circuit breaker 4 is a vertically mounted push-pull free-tripping circuit breaker, and the specifications of the circuit breaker 4 are selected according to the current of the rear-end electrical equipment and the 75% derating. The upper cover 10 is a transparent polycarbonate plate, which is fixed to the shell 9 by screws. The state of the circuit breaker 4 can be observed through the transparent upper cover 10. The housing 9 is designed and perforated as required, the circuit breaker 4, the contactor 7, the diode bracket 6, and the heat sink 8 are fixed on the housing 9 through the reserved space, the diode is fixed on the diode bracket 6, and the lower cover 11 is fixed under the housing 9 by screws to protect the internal components of the present invention. A vibration isolator 12 is provided on the ear piece of the box body, which is used for vibration isolation from the position to be connected, and plays a role in vibration reduction.

[0017] The device of the present invention can also be further configured to reduce weight: the housing (including the upper cover, housing, and lower cover) of the present invention is made of non-metallic materials, and the internal components are made of small and light components. Among them, the circuit breaker weighs about 25g, the contactor weighs about 400g, the housing weighs about 1000g, the wires weigh about 200g, the electrical connector weighs 35g, and the standard parts weigh 100g, achieving the light weight feature of the present invention.

[0018] In order to facilitate the disassembly and wiring of the electrical connector 3, the device should be equipped with a rear-mounted socket. The selection of the electrical connector 3 mainly considers the power requirements of the back-end equipment. Due to the change of the back-end power distribution equipment, the electrical connector 3 with a contact pair that meets the power requirements of the back-end equipment is selected. The live end of the electrical connector 3 is a jack to reduce the risk of electric shock to personnel when the electrical connector 3 is not connected, and to prevent accidental short circuit of the live circuit.

[0019] The wire specifications are selected according to the continuous working current of the electrical equipment at the back end of the device. The wire complies with GJB773 / 8A-2000 and is suitable for aviation, aerospace, shipbuilding, weapons and equipment and instrument line connection. The operating environment temperature is -65℃~200℃ and the rated voltage is below 600V. It has the characteristics of high and low temperature resistance, oil resistance, water resistance, corrosion resistance, flame retardancy, light and strong, and excellent insulation performance. It is used in places with high ambient temperature and harsh conditions. The cross-sectional area and other parameters of the wire are shown in Table 1.

[0020] Table 1 Cross-sectional area and parameters of conductors The length of the wire is cut according to the needs, the wire is protected by heat shrink tube and marked with heat shrink tube as the wire identification. To ensure the reliability of the agency connection, the wire and the connector are crimped.

[0021] The airborne 28V DC power distribution device of the present invention can be used to provide 28V DC power to multiple devices and provide power distribution protection. In addition, through the weight selection of components, the present invention uses small parts, specific material shells and mature processes for product integration, and achieves a weight of no more than 2.9kg while meeting the power distribution needs of 20 airborne electrical equipment. The components selected by the present invention are small in weight, and each circuit breaker weighs about 0.025kg. It is expected that the weight of each additional low-voltage DC power distribution will increase by 0.04kg.

[0022] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Alterations, modifications, substitutions and variations of the above embodiments by a person skilled in the art are all within the scope of the present invention.

Claims

1. An airborne 28V DC power distribution device, characterized in that: It includes terminals K1 and K2, an electrical connector, a circuit breaker, a bus bar, a diode, a contactor, and a heat dissipation bus bar. The terminal K1 is connected to the normally open contact of the contactor, the terminal K2 is connected to the normally closed contact of the contactor, the other end of the contact of the contactor is connected to the bus bar through a wire and then connected to the circuit breaker, the tail end of the electrical connector is connected to the other end of the circuit breaker, the positive and negative ends of the contactor coil are connected to the tail end of the electrical connector, the hole position connecting the electrical connector to the positive and negative ends of the contactor coil is connected to the upper computer, and the remaining holes are connected to the rear-end distribution point, one end of the diode is connected to the electrical connector, and the other end is connected to the positive end of the contactor coil.

2. The airborne 28V DC power distribution device according to claim 1, characterized in that: The other end of the contact of the contactor is connected to the heat dissipation bus bar, and the heat dissipation bus bar is connected to the circuit breaker through the bus bar.

3. The airborne 28V DC power distribution device according to claim 1, characterized in that: The terminals K1, K2, electrical connector, circuit breaker, bus bar, diode, contactor and heat dissipation bus bar are integrated in a box, an upper cover is provided on the box, a lower cover is provided under the box, the circuit breaker is arranged in a vertical direction, and the circuit breaker button is arranged upward.

4. The airborne 28V DC power distribution device according to claim 3, characterized in that: The upper cover is a transparent polycarbonate plate.

5. The airborne 28V DC power distribution device according to claim 1, characterized in that: The circuit breaker is a vertically mounted push-pull type free tripping circuit breaker, and the specification of the circuit breaker is selected according to the current of the rear-end electrical equipment and a 75% derating.

6. The airborne 28V DC power distribution device according to claim 1, characterized in that: A vibration isolator is provided on the ear piece of the box body, which is used for vibration isolation from the position to be connected.

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