Generator slow starting device for starting engine

Abstract

The utility model discloses a generator slow starting device for starting an engine, which comprises a first circuit and a second circuit, the first circuit and the second circuit are respectively connected with a positive electrode and a negative electrode, a shunt resistor and a starting contactor are sequentially connected in series on the first circuit, a short circuit contactor is connected in parallel with the shunt resistor, and the short circuit contactor is closed in a delayed manner after the starting contactor is closed. An auxiliary contact of the short circuit contactor and an auxiliary contact of the starting contactor are respectively connected with an external connector, and the generator slow starting device for starting the engine can slowly start the generator for starting the engine in a ground test, so that the purpose of starting the engine is achieved. During use, only the starting contactor is closed, the shunt resistor is utilized to regulate and control current and voltage, and then the short-circuit contactor is closed in a delayed manner, so that the shunt resistor is short-circuited, the current and voltage return to normal, current fluctuation during sudden power connection is avoided, and equipment damage caused by overlarge starting current is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of engine starting equipment, and more specifically, relates to a starting generator slow starting device for starting an engine. Background Art

[0002] In the ground test of an unmanned aerial vehicle (UAV) engine, it is necessary to start the engine on a test platform. Generally, the engine is rotated by a starting generator integrated with the engine. Therefore, it is necessary to start the starting generator first. During the starting process of the starting generator, if a direct starting method is adopted, a large starting current will be generated, which affects the test safety and the service life of the starting generator.

[0003] Therefore, by designing a starting generator slow starting device, the purpose of slowly starting the starting generator and thus starting the UAV engine on the ground is achieved. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a starting generator slow starting device for starting an engine to solve the problem that the existing direct starting method will generate a large starting current, which affects the test safety and the service life of the starting generator.

[0005] To achieve the above purpose, the utility model provides a starting generator slow starting device for starting an engine, including:

[0006] A first circuit and a second circuit, the first circuit and the second circuit are respectively connected to positive and negative electrodes;

[0007] A shunt resistor and a starting contactor, the shunt resistor and the starting contactor are sequentially connected in series on the first circuit;

[0008] A short-circuit contactor, the short-circuit contactor is connected in parallel with the shunt resistor, and the short-circuit contactor closes with a delay after the starting contactor closes;

[0009] An external connector, an auxiliary contact of the short-circuit contactor and an auxiliary contact of the starting contactor are respectively connected to the external connector.

[0010] Optionally, it further includes a controller, and the controller controls the short-circuit contactor and the starting contactor through the external connector.

[0011] Optionally, it further includes:

[0012] A housing, the housing is in a groove shape, a cover plate is arranged at the open end, and mounting angles are respectively arranged on both sides of one end of the housing away from the cover plate;

[0013] An insulating support, the insulating support is arranged on the housing and is used for connecting to an external power supply;

[0014] A relief hole is provided on the housing, and the external connector passes through the relief hole and is exposed.

[0015] Optionally, the insulating support includes:

[0016] An insulating base, the insulating base is U-shaped, and an insulating cover is provided on the open side;

[0017] A boss, the boss is provided on the side of the insulating base close to the housing, and a groove matching with the boss is provided on the housing;

[0018] A conductive sheet, one end of the conductive sheet is arranged in the insulating base, and the other end of the conductive sheet is inserted into the housing.

[0019] Optionally, the short-circuit contactor and the starting contactor are arranged on one side of the housing close to the relief hole, and the shunt resistor is arranged on one side of the housing far from the relief hole.

[0020] Optionally, convex ribs are provided on both sides of the insulating base, first connection holes are provided on the convex ribs, connection pieces are provided at both ends of the insulating cover, and second connection holes matching with the first connection holes are provided on the connection pieces.

[0021] Optionally, the controller is provided with a delay module.

[0022] Optionally, the starting battery is sequentially connected to the generator and the engine through the soft starting device.

[0023] Optionally, the short-circuit contactor closes at least 1 s after the starting contactor closes.

[0024] Optionally, the housing is a resin-printed housing, and the cover plate is a resin-printed cover plate.

[0025] The utility model provides a soft starting device for a generator for starting an engine, and the beneficial effects thereof are as follows:

[0026] The soft starting device for a generator for starting an engine can slowly start the generator for starting an engine during a ground test, so as to achieve the purpose of starting the engine. When in use, first only the starting contactor is closed, the current and voltage are regulated by using the shunt resistor, and then the short-circuit contactor is closed after a delay, so that the shunt resistor is short-circuited, and the current and voltage return to normal, avoiding the fluctuation of the current when suddenly powered on and preventing the starting current from being too large to damage the device. The external connector is used to feedback the opening and closing state of the contactor and / or control the opening and closing of the main contact through an auxiliary contact.

[0027] Other features and advantages of the present utility model will be described in detail in the following specific implementation section. Description of the Drawings

[0028] By describing the exemplary embodiments of the present utility model in more detail in conjunction with the drawings, the above and other objects, features, and advantages of the present utility model will become more apparent. Among them, in the exemplary embodiments of the present utility model, the same reference numerals generally represent the same components.

[0029] Figure 1 The schematic diagram of the starting generator soft start device for starting an engine according to an embodiment of the present utility model is shown.

[0030] Figure 2 The structural schematic diagram of the starting generator soft start device for starting an engine according to an embodiment of the present utility model is shown.

[0031] Figure 3 The cross-sectional view of the starting generator soft start device for starting an engine according to an embodiment of the present utility model is shown.

[0032] Figure 4 The structural schematic diagram of the insulating support of the starting generator soft start device for starting an engine according to an embodiment of the present utility model is shown.

[0033] Figure 5 The usage flow chart of the starting generator soft start device for starting an engine according to an embodiment of the present utility model is shown.

[0034] Description of the Reference Numerals:

[0035] 1. Shunt resistor; 2. Starting contactor; 3. Short-circuit contactor; 4. External connector; 5. Housing; 6. Insulating base; 7. Insulating cover. Specific Embodiments

[0036] The preferred embodiments of the present utility model will be described in more detail below. Although the preferred embodiments of the present utility model are described below, it should be understood that the present utility model can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present utility model more thorough and complete, and to fully convey the scope of the present utility model to those skilled in the art.

[0037] As Figures 1-5 shown, a starting generator soft start device for starting an engine includes:

[0038] A first circuit and a second circuit, the first circuit and the second circuit are respectively connected to the positive and negative electrodes;

[0039] The shunt resistor 1 and the starting contactor 2 are connected in series to the first circuit in sequence;

[0040] The short - circuit contactor 3 is connected in parallel to the shunt resistor 1 and closes with a time delay after the starting contactor 2 is closed;

[0041] The external connector 4 is connected to the auxiliary contacts of the short - circuit contactor 3 and the auxiliary contacts of the starting contactor 2 respectively.

[0042] Specifically, the short - circuit contactor 3 and the starting contactor 2 are normally open. When in use, first only the starting contactor 2 is closed, and the shunt resistor 1 is used to regulate the current and voltage. Then, the short - circuit contactor 3 is closed with a time delay, so that the shunt resistor 1 is short - circuited, and the current and voltage return to normal, avoiding the current fluctuation when suddenly powered on and preventing the starting current from being too large to damage the equipment. The external connector 4 is used to feedback the opening and closing state of the contactor and / or control the opening and closing of the main contacts through the auxiliary contacts.

[0043] Furthermore, the resistance value of the shunt resistor 1 is equal to the internal resistance of the starting generator. The two ends are connected to the main contacts of the short - circuit contactor 3. When the short - circuit contactor 3 is open, the shunt resistor 1 divides the voltage for the starting generator, and when it is closed, the shunt resistor 1 can be short - circuited to realize the soft start of the starting generator.

[0044] In this embodiment, a controller is further included. The controller controls the short - circuit contactor 3 and the starting contactor 2 through the external connector 4.

[0045] Specifically, the external connector 4 is used to control the opening and closing of the main contacts through the auxiliary contacts.

[0046] In this embodiment, it further includes:

[0047] The housing 5 is in a groove shape, with a cover plate at the open end, and mounting angles are respectively arranged on both sides of the end of the housing 5 far from the cover plate;

[0048] The insulating support is arranged on the housing 5 and is used to connect to the external power supply;

[0049] The avoidance hole is arranged on the housing 5, and the external connector 4 passes through the avoidance hole and is exposed.

[0050] Specifically, the shunt resistor 1, the starting contactor 2 and the short - circuit contactor 3 are enclosed and protected by the housing 5 in cooperation with the cover plate, and the external circuit is connected through the insulating support.

[0051] In this embodiment, the insulating support includes:

[0052] The insulating base 6 is in a U - shape, and an insulating cover 7 is arranged on the open side;

[0053] The boss is arranged on one side of the insulating base 6 close to the outer shell 5, and a groove matching with the boss is arranged on the outer shell 5;

[0054] The conductive sheet, one end of the conductive sheet is arranged in the insulating base 6, and the other end of the conductive sheet is inserted into the outer shell 5.

[0055] Specifically, the insulating base 6 and the insulating cover 7 form a square structure, and the conductive sheet is arranged inside the square structure, which is convenient for the conductive sheet to be exposed to connect the cable and at the same time avoid the conductive sheet protruding and bumping, and the boss and the groove cooperate with each other for positioning.

[0056] In this embodiment, the short-circuit contactor 3 and the starting contactor 2 are arranged on one side of the outer shell 5 close to the avoidance hole, and the shunt resistor 1 is arranged on one side of the outer shell 5 far from the avoidance hole.

[0057] Specifically, a reasonable distribution layout is adopted to avoid the waste of the lines of each component.

[0058] In this embodiment, convex ribs are arranged on both sides of the insulating base 6, first connection holes are arranged on the convex ribs, connection pieces are arranged at both ends of the insulating cover 7, and second connection holes matching with the first connection holes are arranged on the connection pieces.

[0059] Specifically, screws pass through the second connection holes and the first connection holes to cooperate to fix the insulating cover 7 and the insulating base 6.

[0060] In this embodiment, the controller is provided with a delay module.

[0061] Specifically, the controller automatically controls the short-circuit controller to close with a delay through the delay module.

[0062] In this embodiment, the starting battery is sequentially connected to the starting generator and the engine through the soft starting device.

[0063] Specifically, the soft starting device cooperates with the starting generator to softly start the engine.

[0064] Furthermore, under the control of the controller, the soft starting device and the starting generator work together, and the starting generator starts slowly to drive the engine to rotate.

[0065] In this embodiment, the short-circuit contactor 3 closes at least 1 s after the starting contactor 2 closes.

[0066] Specifically, the fluctuating current is fully avoided.

[0067] In this embodiment, the outer shell 5 is a resin-printed outer shell 5, and the cover plate is a resin-printed cover plate.

[0068] Specifically, the outer shell 5 and the cover plate are generated by 3D printing with resin materials.

[0069] When the starting generator soft starting device for starting an engine in this embodiment is in use, taking soft start as an example:

[0070] The material of the housing 5 is resin, which is realized by 3D printing. A total of 4 rectangular holes with a size of 30X6.7 are opened on the left and right side walls for installing insulating supports; a relief hole with a diameter of 23.6 mm and four mounting holes with a diameter of 3.2 mm evenly distributed in a circle are opened on the front side for installing the external connector 4; at the same time, 30 screw holes with a diameter of 3 mm and a depth of 5 mm are opened on the top for installing the cover plate.

[0071] Two groups of round holes with a diameter of 10 mm and a distance of 130 mm are opened on the bottom plate for installing the short-circuit contactor 3 and the starting contactor 2; four holes with a diameter of 6 mm and a distance of 315 mmX105 mm are also opened on the bottom plate for installing the shunt resistor 1; four mounting corners are provided on the outer periphery of the housing 5, and holes with a diameter of 8 mm are opened on the mounting corners, and the hole pitch of the four holes is 540 mmX260 mm for installing the soft starting device.

[0072] The cover plate is a rectangular plate with a size of 500X300 and a thickness of 3 mm, and the material is resin, which is realized by 3D printing. There are 30 holes with a diameter of 3 mm on the cover plate for cooperating with the screw holes to form a closed structure.

[0073] There are bosses on the insulating support, which are installed in cooperation with the grooves on the side plate. There is a round hole with a diameter of 8 mm at the bottom of the insulating seat for installing screws to fix the terminals on the external cable; an installation plate is provided on one side close to the wacker 5, and there are two counterbore holes with a diameter of 3 mm on the installation plate to fix the insulating support on the side plate in cooperation with the boss.

[0074] The external connector 4 is a common aviation socket, and the mating aviation plug is docked with the socket by means of screw connection.

[0075] The conductive sheet is installed on the insulating support, and has a round hole with a diameter of 8 mm and a groove. Through screws, it connects the terminals on the internal cable and the external cable to realize the conduction of the internal and external cables. There are a total of four metal conductive sheets on the soft starting device, two of which are the positive poles of the device and two are the negative poles of the device.

[0076] The shunt resistor 1 includes four mounting corners and two connection tabs. There are holes with a diameter of 8 mm on the four mounting corners respectively, and the hole pitch is 195 mmX315 mm. The two connection tabs can be connected to the terminals on the internal cable by screws to connect the shunt resistor 1 into the circuit. The resistance value of the shunt resistor 1 is the same as that of the starting generator.

[0077] The short-circuit contactor 3 and the starting contactor 2 are contactors with a working current of 500 A and a control current of 5 A respectively. They contain four terminals. Among them, two terminals with a diameter of 8 mm are the main contacts of the contactor, and two terminals with a diameter of 3 mm are the auxiliary contacts. When the auxiliary contacts are connected, there is current passing through the inside of the contactor, and the main contacts close. At this time, the contactor is connected and in the on working state. When the auxiliary contacts are disconnected, the contactor is disconnected. All four terminals are connected to the internal cables through terminals. The auxiliary contacts of the two contactors are connected to the external connector 4 through the internal cables to achieve connection with the external cables; the main contacts of the short-circuit contactor 3 are connected to the two connection pieces of the shunt resistor 1, and one end of the main contacts of the starting contactor 2 is connected to the shunt resistor 1, and the other end is connected to the metal conductive sheet to achieve connection with the external cables.

[0078] The internal cables include the connection cables between the positive metal conductive sheet and the positive pole of the shunt resistor 1, the negative pole of the shunt resistor 1 and the starting contactor 2, the starting contactor 2 and the metal conductive sheet, the short-circuit contactor 3 and the shunt resistor 1, the short-circuit contactor 3 and the starting contactor 2 and the external connector 4, and the negative metal conductive sheet.

[0079] The specific implementation process is as follows:

[0080] The engine starting process requires a starting battery, a soft starting device, a controller, a starter generator, and an engine.

[0081] During the normal starting process, the controller issues a starting command. The current of the starting battery passes through the soft starting device and flows to the starter generator. The controller controls the soft starting device and the starter generator to achieve the slow starting of the starter generator, thereby driving the engine to rotate.

[0082] The implementation method of soft start is as follows: When the current enters the soft start device through the positive metal conductive sheet at one end of the device, the short-circuit contactor 3 is disconnected at this time. The current passes through the shunt resistor 1, flows through the starting contactor 2, and controls the auxiliary contact of the starting contactor to close through the external connector 4. The starting contactor 2 is turned on, and the current flows out from the positive metal conductive sheet at the other end of the device, enters the positive pole of the starting generator, passes through the starting generator coil and flows out from the negative pole of the motor, returns to the negative pole of the soft start device, and flows back to the starting battery through the internal cable between the two negative metal conductive sheets of the device. At this time, the starting current loop is formed, an induced current is generated in the starting generator, and the starting generator starts to rotate. If the starting generator is directly started, the starting current will be too large in the first 1 s before starting. The resistance value of the shunt resistor 1 in the soft start device is the same as that of the starting generator. Therefore, when the soft start device is connected, the shunt resistor 1 plays a voltage-dividing role in the circuit at this time, reducing the voltage across the starting generator and decreasing the starting current. After 1 s, the current decreases. At this time, the controller controls the auxiliary contact of the short-circuit contactor 3 to close, the short-circuit contactor 3 is turned on, the shunt resistor 1 is short-circuited and stops working, the voltage across the starting generator will increase, and under the control of the controller, the current will slowly increase, and the starting generator continues to rotate, driving the engine to rotate.

[0083] The embodiments of the present invention have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A starter-generator slow-start device for starting an engine, characterized in that: include: A first circuit and a second circuit, wherein the first circuit and the second circuit are connected to positive and negative electrodes respectively; A shunt resistor and a starting contactor, wherein the shunt resistor and the starting contactor are sequentially connected in series to the first circuit; A short-circuit contactor, the short-circuit contactor is connected in parallel to the shunt resistor, and the short-circuit contactor is closed with a time delay after the starting contactor is closed; An external connector, to which the auxiliary contacts of the short-circuit contactor and the auxiliary contacts of the starting contactor are respectively connected.

2. The starter-generator slow-start device for starting an engine according to claim 1, characterized in that: A controller is also included, and the controller controls the short-circuit contactor and the starting contactor through an external connector.

3. The starter-generator slow-start device for starting an engine according to claim 1, characterized in that: Also includes: The housing is groove-shaped, a cover plate is provided at the open end, and mounting angles are provided at two sides of an end of the housing away from the cover plate; An insulating support, which is arranged on the housing and is used to connect to an external power source; The avoidance hole is arranged on the shell, and the external connector passes through the avoidance hole to be exposed.

4. The starter-generator slow-start device for starting an engine according to claim 3, characterized in that: The insulating support comprises: An insulating base, wherein the insulating base is U-shaped and an insulating cover is provided on the opening side; A boss, the boss is arranged on a side of the insulating base close to the shell, and the shell is provided with a groove matching with the boss; A conductive sheet, one end of which is arranged in the insulating base, and the other end of which is inserted into the shell.

5. The starter-generator slow-start device for starting an engine according to claim 3, characterized in that: The short-circuit contactor and the starting contactor are arranged on a side of the housing close to the avoidance hole, and the shunt resistor is arranged on a side of the housing far from the avoidance hole.

6. The starter-generator slow-start device for starting an engine according to claim 4, characterized in that: The insulating base is provided with ridges on both sides, and the ridges are provided with first connection holes. The insulating cover is provided with connecting plates at both ends, and the connecting plates are provided with second connection holes matched with the first connection holes.

7. The starter-generator slow-start device for starting an engine according to claim 2, characterized in that: The controller is provided with a delay module.

8. The starter-generator slow-start device for starting an engine according to claim 1, characterized in that: The starting battery is connected to the generator and the engine in sequence through the slow starting device.

9. The starter-generator slow-start device for starting an engine according to claim 1, characterized in that: The short-circuit contactor is closed at least 1 second after the starting contactor is closed.

10. The starter-generator slow-start device for starting an engine according to claim 3, characterized in that: The shell is a resin printed shell, and the cover plate is a resin printed cover plate.

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