JPH01285755A - Refrigerating device for on-vehicle container - Google Patents

Abstract

PURPOSE:To maintain a refrigerating capacity in a container even during the stopping of an engine and keep a refrigerating temperature constant regardless of the fluctuation of the running speed of a vehicle during running by a method wherein the present device is driven by the power of the engine of the vehicle and the output thereof is inputted into an inverter device while the title device is provided with a generator for the power source of the electric instruments of the vehicle and an external power source inputting device supplying an electric power source to the inverter device and the electric instruments of the vehicle from an external source when the driving of the engine is stopped. CONSTITUTION:The output of a generator 2 is inputted into an inverter device 11 through a switch 17 being put ON while the AC output of the generator is converted in the inverting device 2 into AC having a variable frequency and is supplied to a motor driving a compressor. When it is necessary to refrigerate the inside of a container 9 during stopping a vehicle, the commercial power source 14 of a refrigerating factory or the like is connected to the vehicle through a connector 15 and, thereafter, the switch 16 is put ON and the switch 17 is put OFF to operate the inverter device 11 by the commercial power source. Thereafter, a refrigerating unit 13 is operated by the output of the inverter device 11 in the same manner as the operation effected during running.

Description

[Detailed description of the invention] [Industrial usage bone]

The present invention relates to a refrigeration system for a vehicle-mounted container, and more particularly to a refrigeration system for a vehicle-mounted container whose refrigeration compressor can be driven by an external power source when the vehicle is stopped.

[Conventional technology]

FIG. 3 is a block diagram of a conventional on-vehicle container refrigeration system, and FIG. 4 is an external view of a refrigerated truck equipped with the on-vehicle container refrigeration system shown in FIG. In FIG. 3, 1 is a vehicle engine, and a generator 2 is directly connected to the vehicle engine 1. After the output of the generator is rectified by a rectifier 3, it is charged into a battery 4 and supplied to the vehicle electrical components. . Further, 5 is a clutch directly connected to the other end shaft of the engine 1, and a compressor 6 installed in the engine compartment of the vehicle is directly connected to this clutch 5. Reference numeral 7 denotes a pipe that circulates the refrigerant between the compressor 6 and the evaporator/condenser unit 8 disposed at the top of the vehicle. 9 indicates a refrigerated container. Next, the operation of the conventional in-vehicle container refrigeration system will be explained based on the above configuration. The engine 1 of the vehicle includes a drive system for driving the vehicle, and
Power generation 812 and clutch-5 are directly connected. The output of the generator 2 driven by the engine 1 is an AC output! The current is converted into direct current by the rectifier 3, charged into the -H battery 4, and then supplied to vehicle electrical components such as the starter and the battery 1-. Next, when freezing the inside of the refrigerated container, the engine 1 and the compressor 6 are directly connected by the clutch 5, and the compressor 6 is driven by the engine power. By driving this compressor 6, the refrigerant discharged from the combiner 46 is circulated between the compressor G and the evaporator/condenser unit 8 through the pipe 7. In this way, when the refrigerant is circulated, the action of the refrigeration cycle (
ζ Cooler air is not sent into the frozen container 9 to freeze the inside of the container 1. Therefore, raw and light foods can be transported to remote locations. In addition, if refrigeration is not required, by disengaging the clutch 5, the engine 1 and the stiffness,
The connection with the sink 6 is released, and the compressor 6 is not operated unnecessarily.

[Problems to be solved by the invention] Since the conventional refrigeration system for on-vehicle containers is configured as described above, when trying to maintain the refrigeration capacity, I needed to rev the engine. For this reason, for example, in a refrigeration factory where a large number of refrigeration trucks are assembled to carry in and out refrigerated cargo, engine noise and exhaust gas from the vehicles generate pollution, which could become a major social problem. Furthermore, since the engine of a refrigerated truck cannot be started while on board a car ferry, a refrigerated truck equipped with an engine-driven cooling device with a built-in compressor cannot use the car ferry. or,
In conventional devices, the refrigerating capacity fluctuates depending on the vehicle speed, that is, the engine rotational speed, so there was a problem in that it was difficult to maintain a constant temperature inside the container while the vehicle was in operation. This invention was made to solve the above-mentioned problems, and it is possible to maintain the refrigerating capacity inside the container even when the vehicle engine is stopped, and to maintain the refrigerating capacity inside the container while the vehicle is running, despite fluctuations in the running speed. The purpose of this invention is to obtain a refrigeration system for on-vehicle containers that can maintain a constant temperature. [Means for Solving the Problems] The on-vehicle container refrigeration system according to the present invention has a
a refrigeration unit with a built-in electric motor for driving the sensor, an inverter device that converts the electric motor into an inverter, and a power generator that is driven by the engine power of the vehicle and whose output is input to the inverter device and used as a power source for the vehicle electrical components. The vehicle is equipped with an external power input device that supplies power to the inverter device and vehicle electrical components from the outside when the vehicle and engine WEa are stopped.

[For production]

According to this invention, while the vehicle is running, the output of the generator driven by the engine power is supplied to the vehicle electrical components, and after the generator output is controlled to a constant frequency by the inverter device, the generator is used to drive the compressor. gH1II machine to operate the refrigeration unit. In addition, if the engine is stopped due to the vehicle stopping, by operating the external power input device to connect only the power source external to the vehicle to the inverter device, the refrigeration compressor can be operated even when the engine is stopped, and the inside of the refrigerated container can be refrigerated. maintains its refrigeration capacity.

【Example】

Hereinafter, a -* embodiment of the present invention will be explained based on FIGS. 1 and 2. FIG. 1 is a block diagram of the on-vehicle container refrigeration system according to this embodiment, and FIG. 2 is an external view of a refrigerated truck equipped with the on-vehicle container refrigeration system according to this embodiment. In each figure, the same reference numerals as in Figures 3 and 4 are the same.
or a corresponding portion thereof, and detailed explanation thereof will be omitted. 1st
In the figure, 10 is a transformer that steps down the output voltage of the generator 2, 11 is an inverter device, 12 is a motor-internal compressor, 13 is a refrigeration unit containing the compressor 12 and evaporative condenser unit 8, and 14 is an external power source. 15 is a connector for connecting the commercial power supply 14 to the vehicle side, 16 is a switch for connecting the commercial power supply 14 to the inverter device 11, and 17 is for connecting the generator output to the transformer 1.
0 and the inverter device 11. Incidentally, the inverter device 11 and the refrigeration unit 13 are attached to the upper part of the vehicle as shown in FIG. While the vehicle is running, power generation f driven by the power of the engine 1
The output voltage of J2 is used as a power source for vehicle electrical components and a power source for the refrigeration unit 13. However, since the output voltage of the generator 2 is normally rated at around AC200V, this is too high a voltage to charge the battery 4, which is the actual power source for the electrical components, so the generator output is transferred to the transformer 10 to the rated voltage of the battery 4. After stepping down the voltage from about 24 V DC to 24 V AC, the rectifier 3 converts the voltage to DC and charges the battery 4 . The battery 4 is used as a power source for the vehicle's electrical components, such as the starter and lights. Further, the output of the generator 2 is inputted to the inverter device 11 via the switch 17 in ON operation, where the alternating current output of the generator is converted into alternating current of variable frequency and supplied to the motor of the compressor drive IA. As a result, the compressor 12 is driven, and the compressor 7'L bolt 12 and the evaporator
The condenser unit 8 generates a refrigeration cycle to freeze the space between the refrigerated containers 9. At this time, the switch 16 is turned off so that no output is output to the connector 15. Further, when it is necessary to freeze the inside of the container 9 when the vehicle is stopped, a commercial power source 14 from a freezing factory or the like is connected to the vehicle side via the connector 15. The impark device 11 is operated with commercial power by turning on the switch 16 and turning off the switch 17. After this, the refrigeration unit is operated by the output of the inverter device 11).
Driving 13 is the same as driving. As mentioned above, the compressor 12 is driven by the variable frequency alternating current output of the inverter device 11, so when it is desired to increase the refrigerating capacity, that is, to lower the temperature inside the container 9, the impark device 11 outputs a high frequency alternating current. In the opposite case, the compressor M2 may be rotated at a low speed using low-frequency alternating current. In addition, in this example, kelp 1. - Although the compressor is configured to be driven by the inverter output, if there is no need to control the refrigeration capacity, the inverter may be omitted and the compressor may be configured to be directly driven by the generator output or commercial power. .

【Effect of the invention】

As described above, according to the present invention, the electric gJ machine of the refrigeration compressor drive angle is configured so that it can also be driven by a power source external to the refrigeration vehicle. There is no need to drive the generator to supply power to the motor.
It can eliminate problems such as engine noise and exhaust gas that cause pollution. Additionally, when the vehicle is running, by controlling the output of the generator driven by the engine at a constant frequency using an inverter, the refrigeration capacity can be kept constant regardless of the vehicle speed, and the refrigeration temperature inside the container can be set at will. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an on-vehicle container refrigeration system according to an embodiment of the present invention, FIG. 2 is an external view of a vehicle incorporating the on-vehicle container refrigeration system of this embodiment, and FIG. 3 is a conventional on-vehicle container refrigeration system. FIG. 4 is a block diagram showing a container refrigeration system, and is an external view of a vehicle incorporating a conventional vehicle-mounted container refrigeration system. engine, 2. generator, 3. rectifier, 4. battery,
10. Transformer, 11... Inverter, 13. Refrigeration unit, 14. Commercial power supply. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] A refrigeration unit that has a built-in electric motor for driving a compressor, an inverter device that controls the electric motor using an inverter, and is driven by the engine power of the vehicle, and its output is used as input for the inverter device and serves as a power source for the electrical components of the vehicle. A refrigeration system for a vehicle-mounted container, comprising a generator and an external power input device that supplies power to the inverter device and vehicle electrical components from the outside when the engine is stopped.