Device capable of meeting starting requirement of vehicle-mounted liquid supply high-power water pump

Abstract

The invention discloses a device capable of meeting starting of a vehicle-mounted liquid supply high-power water pump. The device comprises a vehicle-mounted lithium battery, a PLC, an air switch, an inverter power supply, an alternating current contactor, an overload protector, a soft starter and a water pump starting valve arranged on the water pump. The vehicle-mounted lithium battery inputs a 220V AC power supply and a vehicle-mounted generator, one path of output of the vehicle-mounted lithium battery supplies power to the PLC through a transformer, the other path of output of the vehicle-mounted lithium battery supplies power to the inverter power supply through an air switch, and the inverter power supply is connected with the water pump sequentially through an AC contactor, an overload protector and a soft starter. The overload protector, the alternating current contactor, the soft starter, the water pump starting valve and the water pump are electrically connected with the PLC. The vehicle-mounted liquid supply high-power water pump has the beneficial effects that the problem of starting the vehicle-mounted liquid supply high-power water pump is solved, the capacity of a vehicle-mounted lithium battery and an inverter of power supply equipment can be reduced, and the product cost is reduced.

Description

Technical Field

[0001] The invention relates to the field of water pump starting devices, in particular to a device capable of starting a high-power water pump on a vehicle for liquid supply. Background Art

[0002] In the field of vehicle-mounted cooling liquid equipment, special equipment such as vehicle-mounted lasers, vehicle-mounted radars and vehicle-mounted power generation need to use water pump circulation for heat dissipation. The power supply capacity of vehicle-mounted movable equipment is small and the installation space is limited. When the equipment heat dissipation demand is large, a high-power water pump is required to provide a water flow that meets the requirements. Due to the large starting torque of the high-power water pump, the impact current when the water pump starts is large, generally 9 times the rated current (9Ie). When the water pump starts, the power supply equipment will be over-current protected. If the capacity and volume of the vehicle-mounted power supply equipment are not further increased, the vehicle-mounted power supply equipment will be difficult to meet the water pump starting requirements. Summary of the invention

[0003] The present invention provides a device capable of starting a high-power water pump for on-board liquid supply, so as to solve the problem of starting a high-power water pump for on-board liquid supply in the prior art, thereby reducing the capacity of on-board power supply equipment of power supply equipment and reducing product costs.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: A device capable of starting a high-power water pump for on-board liquid supply comprises an on-board lithium battery, a PLC controller, an air switch, an inverter, an AC contactor, an overload protector, a soft starter, and a water pump starting valve configured for the water pump; the input end of the on-board lithium battery is respectively connected to a 220VAC power supply and an on-board generator, one output of the on-board lithium battery is powered to the PLC controller through a transformer, and another output of the on-board lithium battery is powered to the inverter through an air switch, and the PLC controller is also connected to the inverter through an RS485 communication line; the output end of the inverter is connected to the water pump through an AC contactor, an overload protector and a soft starter in sequence, the overload protector is electrically connected to the PLC controller for signal transmission, and the PLC controller is respectively electrically connected to the AC contactor, the soft starter, the water pump starting valve, and the water pump control.

[0005] Furthermore, the PLC controller is also connected to a touch screen.

[0006] Furthermore, the water pump is provided with a crankshaft heater, and the crankshaft heater is electrically connected to the water pump under the control of the PLC controller.

[0007] Furthermore, it also includes a temperature sensor, a water pressure sensor, and a water flow sensor, which respectively collect the temperature, pressure, and flow of water output by the water pump, and are respectively electrically connected to the PLC controller for signal transmission.

[0008] In order to meet the conditions of not increasing the vehicle-mounted power supply capacity and installation space, the present invention starts a high-power water pump to reduce the starting current of the water pump. Therefore, a soft starter is added to the water pump power supply circuit, which can reduce the pressure of the water pump for starting, and reduce the starting impact current of 9Ie to about 4Ie. In order to further reduce the starting current, a starting valve is installed at the water inlet of the water pump. When the water pump is started, it is closed, and the water pump is started without load to reduce the starting torque. After the start is completed, it is opened to reduce the starting impact current to about 2Ie. At the same time, an 80W electric heater is installed in the water pump crankshaft to preheat the water pump crankshaft, which can reduce the viscosity of the lubricating oil and reduce the friction of the water pump starting to further reduce the starting impact current of the water pump.

[0009] The beneficial effects of the present invention are that the problem of starting a high-power water pump for liquid supply on a vehicle is solved, the capacity of a lithium battery and an inverter on the vehicle of a power supply device can be reduced, and the product cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural principle block diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0011] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0012] like Figure 1 As shown, this embodiment discloses a device that can meet the starting requirements of a high-power vehicle-mounted liquid supply water pump, including a vehicle-mounted lithium battery D, a DC transformer, a PLC controller AP1, a touch screen, a water flow sensor L, a water pressure sensor P, a water temperature sensor T, an air switch QF, an inverter power supply PS, an AC contactor KM, an overload protector FR, a soft starter RQ, and a water pump starting valve MV configured at the inlet of the water pump MP, and a crankshaft heater installed in the water pump.

[0013] The vehicle-mounted lithium battery D (500VDC) has two inputs, one of which is connected to the vehicle-mounted generator FD through the wire L2 connected to the aviation plug interface XS1. The other input is connected to the mains 220VAC power supply through the wire L1 connected to the aviation plug interface XS2.

[0014] The on-board lithium battery D (500V DC) has two outputs: one output is connected to the input line of the DC transformer B (500VDC / 26VDC) through the aviation plug interface XS3, and the output line of the DC transformer B is connected to the power interface of the PLC controller AP1 through the wire L5. The other output is connected to the input end of the air switch QF through the wire L4 connected to the aviation plug interface XS4, and the output end of the air switch QF is connected to the input end of the inverter power supply PS through the wire L6.

[0015] The overload protector FR is electrically connected to the AP1 digital quantity DI2 interface signal transmission of the PLC controller through a wire. The PLC controller is electrically connected to the AC contactor KM, soft starter RQ, water pump starting valve MV, water pump MP and crankshaft heater control through its own AP1 digital quantity DI interface, and the PLC controller outputs control switch quantities to the AC contactor KM, soft starter RQ, water pump starting valve MV, water pump MP and crankshaft heater respectively.

[0016] The output end of the inverter power supply PS is connected to the input end of the AC contactor KM through the wire L7, the output end of the AC contactor KM is connected to the input end of the overload protection FR through the wire L8, the output end of the overload protection FR is connected to the input end of the soft starter RQ through the wire L9, and the output end of the soft starter RQ is connected to the junction box of the water pump MP through the wire L10.

[0017] In addition, the RS485 output interface of the PLC controller AP1 is connected to the RS485 input interface of the inverter power supply PS through a communication line, and the RS232 interface output terminal of the PLC controller is connected to the RS232 interface input terminal of the touch screen through a wire.

[0018] The water flow sensor L, the water pressure sensor P and the temperature sensor T respectively collect the water flow rate, pressure and temperature of the water output by the water pump MP. The water flow sensor L, the water pressure sensor P and the temperature sensor are connected to the AP1 analog AI interface DI1 of the PLC controller through wires; In this embodiment, the vehicle-mounted lithium battery D (500VDC) includes two inputs: the aviation plug interface XS1 is connected to the vehicle-mounted generator FD through the wire L2, and the aviation plug interface XS2 is connected to the mains 220VAC through the wire L1; the vehicle-mounted lithium battery 500VDC includes two outputs: one aviation plug interface XS3 is connected to the DC transformer B (500VDC / 26VDC) input line through the wire L3 to supply power to the control system, and the other aviation plug interface XS4 is connected to the input end of the air switch QF through the wire L4 to supply power to the water pump load.

[0019] In this embodiment, the AC transformer B (500VDC / 26VDC) converts the DC voltage 500V into DC 26V to supply power to the PLC controller AP1 and the touch screen AP2.

[0020] In this embodiment, the RS232 interface of the PLC controller AP1 is connected to the touch screen AP2 via a 2-core shielded communication twisted wire, and the RS485 interface of the PLC controller AP1 is connected to the RS485 interface of the inverter power supply PS via a 2-core shielded communication twisted wire.

[0021] In this embodiment, the air switch QF can isolate the power supply to the load and provide protection when the load is short-circuited.

[0022] In this embodiment, the inverter power supply PS converts the DC 500V voltage into an AC 3 / N / PE-380V 50HZ three-phase four-wire system. The touch screen connection can remotely operate the inverter power supply PS switch. The inverter power supply PS has overcurrent and high and low voltage protection and phase loss protection.

[0023] In this embodiment, the AC contactor KM has the function of on-load switching, and when on and off, there are opening and closing contacts to physically isolate the power supply and the load to ensure the safety of electricity use.

[0024] In this embodiment, the overload protection FR has load overcurrent protection and phase loss protection to ensure the safety of the equipment.

[0025] In this embodiment, the soft starter RQ has a PWM output voltage regulation function. When starting, the output voltage is Ue×40%. According to the set voltage rising slope, the output voltage rises to the rated voltage Ue after a delay of 10 seconds, thereby reducing the inrush current during starting.

[0026] In this embodiment, the water pump starting valve MV cooperates with the water pump MP. When the water pump MP starts, the water pump starting valve MV is closed, and the starting torque of the water pump MP is reduced, which effectively reduces the starting current of the water pump MP.

[0027] In this embodiment, the crankshaft heater is used to preheat the water pump MP in advance, so that the grease is diluted to reduce the friction during startup, and the startup resistance can be greatly reduced when running at a low temperature.

[0028] In this embodiment, the aviation plug interface XS1 is connected to the vehicle-mounted generator FD through the wire L2 for mobile floating charging. When the vehicle is parked, the aviation plug interface XS2 is connected to the mains 220VAC through the wire L1 for charging.

[0029] AC transformer B (500VDC / 26VDC) converts 500VDC into 26VDC to power the PLC controller AP1 and the touch screen. After the self-test of the PLC controller AP1 and the touch screen is completed, the water flow rate, pressure and temperature detected by the water flow sensor L, water pressure sensor P and temperature sensor T are read on the touch screen.

[0030] The water pump start valve MV is in a closed state, and the crankshaft heater of the water pump MP is energized to preheat the water pump MP.

[0031] When the touch screen AP2 gives a working instruction, the inverter power supply PS works, and the inverter power supply PS converts the DC 500V voltage into AC 3 / N / PE-380V 50HZ three-phase four-wire system. When the water pump MP is started, the AC contactor KM closes and works, and the overload protector FR plays an overcurrent protection role on the water pump MP load. The output voltage of the soft starter RQ rises to the rated voltage (Ue×100%) after the set (Ue×40%) time (10S), and the step-down start is completed. The water pump start valve MV opens, the crankshaft heater of the water pump MP is turned off, and the water pump MP is started, which can meet the starting requirements of the vehicle-mounted high-power water pump for liquid supply.

[0032] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. The embodiments described in the present invention are merely descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. The various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction, and such combinations should also be regarded as the contents disclosed in the present disclosure as long as they do not violate the concept of the present invention. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0033] The present invention is not limited to the specific details of the above-mentioned embodiments. Within the technical concept of the present invention and without departing from the design concept of the present invention, various modifications and improvements made to the technical solution of the present invention by technical personnel in this field should fall within the protection scope of the present invention. The technical contents for which protection is sought in the present invention have been fully recorded in the claims.

Claims

1. A device capable of starting a high-power water pump for liquid supply on a vehicle, characterized in that: It includes a vehicle-mounted lithium battery, a PLC controller, an air switch, an inverter power supply, an AC contactor, an overload protector, a soft starter, and a water pump starting valve configured for the water pump; the input end of the vehicle-mounted lithium battery is respectively connected to a 220VAC power supply and a vehicle-mounted generator, one output of the vehicle-mounted lithium battery is powered to the PLC controller through a transformer, and another output of the vehicle-mounted lithium battery is powered to the inverter power supply through an air switch, and the PLC controller is also connected to the inverter power supply through an RS485 communication line; the output end of the inverter power supply is connected to the water pump through an AC contactor, an overload protector and a soft starter in sequence, the overload protector is electrically connected to the PLC controller for signal transmission, and the PLC controller is respectively electrically connected to the AC contactor, the soft starter, the water pump starting valve, and the water pump control.

2. A device capable of starting a high-power water pump for vehicle-mounted liquid supply according to claim 1, characterized in that: The PLC controller is also connected to a touch screen.

3. The device capable of starting a high-power water pump for vehicle-mounted liquid supply according to claim 1, characterized in that: The water pump is equipped with a crankshaft heater, and is electrically connected to the crankshaft heater under the control of the PLC controller.

4. The device capable of starting a high-power water pump for vehicle-mounted liquid supply according to claim 1, characterized in that: It also includes a temperature sensor, a water pressure sensor, and a water flow sensor. The temperature sensor, the water pressure sensor, and the water flow sensor respectively collect the temperature, pressure, and flow of the water output by the water pump. The temperature sensor, the water pressure sensor, and the water flow sensor are respectively electrically connected to the PLC controller for signal transmission.

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