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

Abstract

The utility model discloses a device capable of meeting the starting requirement of a vehicle-mounted liquid supply high-power water pump. The device comprises a vehicle-mounted lithium battery, a PLC (Programmable Logic Controller), 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 starting device has the advantages of solving the starting problem of the vehicle-mounted liquid supply high-power water pump, reducing the capacity of a vehicle-mounted lithium battery and an inverter of power supply equipment, and reducing product cost.

Description

Technical Field

[0001] The utility model 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 on-board cooling liquid equipment, special equipment such as on-board lasers, on-board radars, and on-board power generation require water pump circulation for heat dissipation. The power supply capacity of on-board movable equipment is small and the installation space is limited. When the equipment has a large heat dissipation demand, 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 inrush 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 overcurrent protection. If the capacity and volume of the on-board power supply equipment are not further increased, the on-board power supply equipment will be difficult to meet the water pump starting requirements. Utility Model Content

[0003] The utility model provides a device capable of starting a high-power vehicle-mounted liquid supply pump, so as to solve the problem of starting a high-power vehicle-mounted liquid supply pump in the prior art, thereby reducing the capacity of the vehicle-mounted power supply equipment and reducing product costs.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present utility model is:

[0005] A device capable of starting a high-power on-board liquid supply water pump comprises an on-board lithium battery, a programmable logic controller (PLC), 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 on-board lithium battery input ends are respectively connected to a 220VAC power supply and an on-board generator, one output of the on-board lithium battery is supplied to the PLC controller via a transformer, and another output of the on-board lithium battery is supplied to the inverter power supply via an air switch, and the PLC controller is also communicatively connected to the inverter power supply via an RS485 communication line; the inverter power supply output end is connected to the water pump via the AC contactor, the overload protector, and the 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.

[0006] Furthermore, the PLC controller is also connected to a touch screen.

[0007] Furthermore, the water pump is equipped with a crankshaft heater, and is electrically connected to the crankshaft heater under the control of the PLC controller.

[0008] 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.

[0009] In order to meet the requirements of not increasing the on-board power supply capacity and installation space, the utility model starts a high-power water pump and reduces the starting current of the water pump. Therefore, a soft starter is added to the water pump power supply circuit, which can reduce the voltage of the water pump for starting, reducing the starting impact current of 9Ie to about 4Ie. 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 starting, 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 when the water pump is started, further reducing the starting impact current of the water pump.

[0010] The beneficial effect of the utility model is that it solves the problem of starting a high-power water pump for liquid supply on a vehicle, can reduce the capacity of the vehicle-mounted lithium battery and inverter of the power supply equipment, and reduce product costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural principle block diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] 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 an on-board 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, a water pump starting valve MV configured at the inlet of the water pump MP, and a crankshaft heater installed in the water pump.

[0014] The vehicle-mounted lithium battery D (500VDC) has two inputs. One input is connected to the vehicle-mounted generator FD via the wire L2 connected to the aviation plug interface XS1. The other input is connected to the 220VAC mains power supply via the wire L1 connected to the aviation plug interface XS2.

[0015] The onboard lithium battery D (500V DC) has two outputs: one output is connected to the input of DC transformer B (500VDC / 26VDC) via cable L3 connected to aviation plug connector XS3. The output of DC transformer B is connected to the power connector of PLC controller AP1 via cable L5. The other output is connected to the input of circuit breaker QF via cable L4 connected to aviation plug connector XS4. The output of circuit breaker QF is connected to the input of inverter power supply PS via cable L6.

[0016] The overload protector FR is electrically connected to the AP1 digital DI2 interface of the PLC controller via 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 via its own AP1 digital DI interface. The PLC controller outputs control switching values ​​to the AC contactor KM, soft starter RQ, water pump starting valve MV, water pump MP, and crankshaft heater.

[0017] 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.

[0018] 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.

[0019] Water flow sensor L, water pressure sensor P and temperature sensor T respectively collect water flow rate, pressure and temperature of the water output by the water pump MP, water flow sensor L, water pressure sensor P and temperature sensor are connected to the PLC controller AP1 analog AI interface DI1 via wires;

[0020] In this embodiment, the on-board lithium battery D (500VDC) includes two inputs: an aviation plug interface XS1 is connected to the on-board generator FD via a wire L2, and an aviation plug interface XS2 is connected to the mains 220VAC via a wire L1. The on-board lithium battery 500VDC includes two outputs: an aviation plug interface XS3 is connected to the input line of the DC transformer B (500VDC / 26VDC) via a wire L3 to supply power to the control system, and an aviation plug interface XS4 is connected to the input end of the air switch QF via a wire L4 to supply power to the water pump load.

[0021] In this embodiment, the AC transformer B (500VDC / 26VDC) converts the DC voltage of 500V into DC 26V to power the PLC controller AP1 and the touch screen AP2.

[0022] 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 cable, 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 cable.

[0023] In this embodiment, the air switch QF can isolate the power supply to the load and provide protection when the load is short-circuited.

[0024] 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, high and low voltage protection, and phase loss protection.

[0025] In this embodiment, the AC contactor KM has the function of on-load switching. When on and off, the contacts are opened and closed to physically isolate the power supply from the load to ensure power safety.

[0026] In this embodiment, the overload protection FR has load overcurrent protection and phase loss protection to ensure the safety of the equipment.

[0027] In this embodiment, the soft starter RQ has a PWM output voltage regulation function. At startup, the output voltage Ue×40% is increased according to the set voltage rising slope. After a delay of 10 seconds, the output voltage rises to the rated voltage Ue, thereby reducing the inrush current at startup.

[0028] 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 is equivalent to no-load operation, and effectively reduces the starting current of the water pump MP.

[0029] In this embodiment, the crankshaft heater is used to preheat the water pump MP in advance, so that the grease is diluted to reduce friction during startup, and the startup resistance can be greatly reduced when running at a low temperature.

[0030] In this embodiment, the aviation socket XS1 is connected to the vehicle-mounted generator FD through the wire L2 for mobile floating charging. When the vehicle is parked, the aviation socket XS2 is connected to the mains 220VAC through the wire L1 for charging.

[0031] AC transformer B (500VDC / 26VDC) converts 500VDC into 26VDC to power the PLC controller AP1 and touch screen. After the PLC controller AP1 and touch screen complete self-test, 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.

[0032] 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.

[0033] When touch screen AP2 issues a start command, inverter power supply PS activates, converting 500V DC to 380V AC, 50Hz, three-phase, four-wire 3 / N / PE. When water pump MP starts, AC contactor KM closes, overload protector FR provides overcurrent protection for the water pump MP load. The output voltage of soft starter RQ rises to the rated voltage (Ue × 100%) after a set time (10s) of (Ue × 40%), completing the step-down start. Water pump starting valve MV opens, and the crankshaft heater of water pump MP turns off, completing the startup of water pump MP. This meets the starting requirements of high-power on-board water pumps.

[0034] The preferred embodiments of the present invention are described in detail above with reference to 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 unless there is any contradiction. Such combinations, as long as they do not violate the concept of the present invention, should also be regarded as the contents disclosed in the present disclosure. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0035] The present invention is not limited to the specific details in 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 those skilled in the art should fall within the protection scope of the present invention. The technical contents for which protection is sought in the present invention have all been recorded in the claims.

Claims

1. A device that can meet the needs of starting a high-power water pump for vehicle-mounted liquid supply, 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 communicatively connected to the inverter power supply via an RS485 communication line; the output end of the inverter power supply is connected to the water pump in sequence through an AC contactor, an overload protector and a soft starter, 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.

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

3. The device according to claim 1, which can meet the requirements of starting a high-power water pump for vehicle-mounted liquid supply, is 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 according to claim 1, which can meet the requirements of starting a high-power water pump for vehicle-mounted liquid supply, is characterized in that: 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. The temperature sensor, water pressure sensor, and water flow sensor are respectively electrically connected to the PLC controller for signal transmission.

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