JPH0448645B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power supply method and device for an on-vehicle AC refrigerating machine that enables the on-vehicle AC refrigerating machine to be provided with a stable power source for refrigeration operation using the output of the automobile engine. .

Commercially available refrigerators are generally for AC commercial power supplies, and there are no DC refrigerators on the market other than custom-made products, so it is unthinkable to use DC refrigerators in anything other than large-scale refrigeration equipment of the same design. To achieve this, conventional refrigeration systems for mobile food sales vehicles operate a DC generator using the output of the car's engine, charge a battery with the DC power generated, and use the power from the battery to drive a DC motor. The common method is to operate an AC generator using the output, and use the AC power to operate the compressor and operate the cooling system.
The method is to operate the cooling system by connecting the compressor to the car engine output.When the mobile sales vehicle returns to the depot, the loaded food is transferred from the sales vehicle to the freezer and stored, and then used for the next operation. It is necessary to load and display the stored food on the sales vehicle again on the same day, and it takes a lot of time and effort to unload and stack the food, which reduces the actual sales time and wastes labor. This not only hinders the improvement of sales performance, but also requires a lot of effort in terms of product quality and hygiene control and quantity control. In order to avoid this, a mobile sales vehicle is equipped with a compressor for use when the car engine is running and a compressor for commercial power to be used for other times, and the on-vehicle refrigerator is operated continuously day and night to store food. Normally, it is kept cool while it is onboard, but in this case, as mentioned above, when the cooling system is operated by the car engine output, the operation of the engine is unstable, such as at unstable speeds while driving or idling when stopped. The power supply is irregular and has an extremely large range of variation, making it an unstable power source with large fluctuations in voltage and frequency.As a result, the cooling operation is unstable, and it also has the disadvantage of increasing costs because it is equipped with two compressors. It was hot.

The purpose of the present invention is to provide a stable, high-output AC power source when the engine of a mobile sales vehicle is in operation, and to enable the on-vehicle AC refrigerator to operate by switching to commercial power after returning to the depot. The present invention aims to provide a power supply method and device for an on-vehicle AC refrigerator that can perform stable cooling operations and also be used as a power source for lighting, public address systems, registers, etc. For use in an on-vehicle AC refrigerator, characterized in that the output of the hydraulic motor drives a hydraulic motor via a hydraulic pump, and the output of the hydraulic motor operates an alternating current generator to supply the generated AC power to the on-vehicle AC refrigerator. A hydraulic pump operated by a power supply method and the output of an automobile engine, a hydraulic motor driven by the hydraulic pressure of the hydraulic pump, an oil circulation path for circulating oil from the hydraulic motor to the hydraulic pump side, and a regulating valve from the hydraulic pump. an oil return path that returns part of the oil to the input side of the hydraulic pump via the hydraulic motor, an alternator that is rotated by the output of the hydraulic motor, and an on-vehicle refrigerator that supplies alternating current power generated by the alternator. This is a power supply device for an on-vehicle AC refrigerator, characterized by the following.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. A hydraulic pump 2 is operated by the output of an automobile engine 1, and the hydraulic pressure is transferred to a hydraulic motor 3.
The oil discharged from the hydraulic motor 3 passes through a heat exchanger 4 as necessary, cools it, and flows back to the hydraulic pump 2 side via an oil tank 5, forming an oil circulation path. The hydraulic pump 2 is configured with an oil return path that partially returns the hydraulic pressure from the pump 2 to the input side of the hydraulic pump 2 via the regulating valve 6.
The alternator 7 is driven by the output of the hydraulic pump 2, which stabilizes the oil discharge amount without being affected by engine rotational fluctuations, and the hydraulic motor 3 that is interlocked with the hydraulic pump 2. Because it is a stable AC power source, it is possible to obtain stable AC power. Therefore, for example, an AC power source of three-phase AC 200V 50Hz is generated, and the AC power is supplied to, for example, a three-phase AC 200V in-vehicle AC refrigerator 10 by connecting it to the in-vehicle terminal 9a side of the changeover switch 8 to perform a predetermined cooling operation. Furthermore, commercial power is supplied to the vehicle-mounted AC refrigerator 10 by connecting the changeover switch 8 to the outdoor terminal 9b side. The in-vehicle AC refrigerator 10 is connected in parallel via a transformer 11 to terminal equipment such as in-vehicle lighting, a public address system, and a register.

Therefore, when operating the engine of a mobile sales vehicle, if the selector switch 8 is connected to the terminal 9a inside the vehicle, the output of the engine 1 is relayed through the hydraulic pump 2 and the hydraulic motor 3, and the alternating current directly generated by the alternator is transferred. Power is supplied to the vehicle-mounted AC refrigerator 10, and since the AC power supply is stable and high output, stable cooling operation of the refrigerator 10 can be ensured, and when the engine drive is stopped after returning to the vehicle, Changeover switch 8
If the refrigerator 10 is connected to the outdoor terminal 9b side, the refrigerator 10 continues its cooling operation, so that the necessary cold storage can be ensured while the food is always loaded on the mobile sales vehicle. Since the AC power supply has a stable and high output, it is suitable for satellite broadcasting relay vehicles, various construction vehicles, medical vehicles, etc., and is also suitable for powering vehicle body accessories and on-board equipment such as lighting, public address systems, registers, etc. It can also be used.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the configuration of an embodiment of the present invention,
FIG. 2 is a block diagram of the same.

Claims (1)

[Claims] 1 Hydraulic pump 2 by the output of automobile engine 1
A power supply for an on-vehicle AC refrigerator, characterized in that a hydraulic motor 3 is driven through the hydraulic motor 3, and an AC generator 7 is operated by the output of the hydraulic motor 3, and the generated AC power is supplied to an on-vehicle AC refrigerator 10. Supply method. 2. A hydraulic pump 2 operated by the output of the automobile engine 1, a hydraulic motor 3 driven by the hydraulic pressure of the hydraulic pump 2, an oil circulation path for circulating oil from the hydraulic motor 3 to the hydraulic pump 2 side, and the hydraulic pump 2, an oil return path that returns part of the oil to the input side of the hydraulic pump 2 via a regulating valve 6; an alternator 7 rotated by the output of the hydraulic motor 3; A power supply device for a vehicle-mounted AC refrigerator, characterized by comprising a vehicle-mounted AC refrigerator 10 that supplies AC power.