JPH01285754A - Refrigerating device for on-vehicle container - Google Patents

Abstract

PURPOSE:To maintain a refrigerating capacity in a container even during stopping an engine and keep a refrigerating temperature constant regardless of the fluctuation of the running speed of a vehicle during running by providing an external power source inputting device which supplies an input voltage from an external power source into an inverter device during the stopping of the engine. CONSTITUTION:When cargoes are loaded or unleaded in a refrigerating factory or the like, an engine 1 is stopped and the commercial power source (AC 200V normally) of the refrigerating factory or the like is connected to a vehicle through a connector 16. In this case, a switch 17 is cut OFF to prevent the impression of a voltage on a generator 10. The output of the commercial power source is converted into a variable frequency by an inverter device 12 to drive a compressor 13 and obtain the refrigerating capacity of the refrigerating container 9 as same as a case under the running condition of the vehicle. The compressor 13 is driven by a variable frequency AC output of the inverter device 12 and, therefore, the refrigerating capacity (or a refrigerating temperature in the container) of a refrigerating unit 8 may be made variable.

Description

[Detailed Description of the Invention] [Field of Industrial Application] 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 a refrigeration system equipped with the on-vehicle container refrigeration system shown in FIG. It is an external view of Jl-rack.

In FIG. 3, 1 is a vehicle engine.

A generator 2 is directly connected to the vehicle engine 1, and the output of the generator is rectified by a rectifier 3, and then 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 room of the vehicle is directly connected to this clutch 5. A piping 7 circulates refrigerant between the compressor 6 and the evaporative 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
The generator 2 and the clutch 5 are directly connected. engine 1
Since the output of power generation 812 driven by
After being charged, it is supplied to vehicle electrical components such as starters and lights.

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 the compressor 6, the refrigerant discharged from the compressor 6 is circulated between the compressor 6 and the evaporator condenser unit 8 through the pipe 7. When the refrigerant is circulated in this manner, cold air is sent into the freezing container 9 by the action of the refrigeration cycle, thereby freezing the inside of the container. For this reason, raw! ￥You can transport food items to remote locations. In addition, when refrigeration is not necessary, by disengaging the clutch 5, the connection between the engine 1 and the compressor 6 is released, and the congolese/sosa 6 is not operated unnecessarily.

[Problem to be solved by the invention] Since the conventional refrigeration system for 41 containers is configured as described above, in order to maintain the refrigerating capacity, the engine must be turned on to drive the compressor even when the vehicle is stopped. @
I needed to turn it around. For this reason, for example, at a refrigeration factory where there are many refrigerated trucks that transport refrigerated cargo,
Pollution caused by vehicle engine noise and exhaust gas is a major problem in society.

It could have become an issue. Furthermore, since refrigerated trucks cannot start their engines while on board a car ferry, refrigerated trucks equipped with engine-driven refrigerating equipment with a built-in compressor cannot use car ferries. In addition, in the conventional device, /-i!
Since the freezing capacity fluctuates, there were problems such as difficulty in keeping the temperature inside the container constant 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 to solve the problem]

The refrigeration system for a vehicle-mounted container according to the present invention includes a refrigeration unit I that includes a built-in electric motor for driving a refrigeration compressor;
A generator driven by the power of a vehicle engine, an inverter device that converts the frequency of the generator output and inputs it to the electric motor, and an external device that supplies input voltage from an external M source to the inverter device when the engine is stopped. A power input device is provided.

[Effect]

According to this invention, while the vehicle is running, a generator separate from the engine-driven generator that supplies power to electrical components is operated by the engine, and the output of the generator is controlled to a constant frequency by the inverter. , is supplied to the electric motor for driving the compressor to operate the refrigeration unit. Furthermore, when the engine is stopped due to the vehicle being stopped, the refrigerating compressor is driven by supplying inverter power from an external power source to operate the electric motor, thereby maintaining the refrigerating capacity within the refrigerating container.

〔Example〕

An embodiment of the present invention will be described below with reference to 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 container refrigeration system according to this embodiment. In each figure, the same reference numerals as in FIGS. 3 and 4 indicate the same or corresponding parts, and detailed explanation thereof will be omitted. In FIG. 1, 10 is a generator, 11 is a rectifier that rectifies the output of the generator 10, 12 is an inverter device that converts the DC output of the rectifier W111 into variable frequency AC, and 13 is driven by the output of the inverter device 12. Compressor with built-in motor,
14 is a refrigeration unit containing the evaporator/condenser unit 8 and the compressor 13, 15 is a commercial power source for a refrigeration factory, etc., 16 is a connector for connecting the commercial power source 15 to the vehicle side, and 17 is a switch.

In addition, impark mounting M12. The refrigeration unit 14 is usually mounted on the top of the vehicle.

Next, the operation of this embodiment will be explained based on the above configuration. The generator 2 is driven by the vehicle's engine 1 as in the conventional device, and the generator output is converted into DC by a rectifier 3, and then charged into a battery 4, which is then used to power the vehicle's electrical components 2, such as a starter, etc. It is used as a Ti source.

Then, while the vehicle is running, another generator 10 is operated by the engine 1. The output voltage of this generator 10 is usually A
Since the voltage is about 200V,
The voltage is considerably higher than the voltage that can be charged with C24V). The output of the generator 10 is rectified by a rectifier 11 (a trowel) and input to the impark device 12.The impark device 12 converts the output to variable frequency alternating current (usually AC 200V) and stores it in the compressor. The compressor 13 is operated to generate a refrigeration cycle with the evaporator/condenser unit 8, thereby freezing the inside of the refrigerating container 9. When driving, switch 17 should be turned on.

Next, Niresin 1 is used when loading and unloading cargo at freezing factories, etc.
Stop the commercial power supply (usually AC 200V) of the freezing factory, etc.
is connected to the vehicle side via the connector 16. At this time, the switch 17 is turned off so that no voltage is applied to the complete i'T: machine 10. The output of this commercial power source is converted into a variable frequency by the inverter device 12 to drive the compressor 13, and the refrigerating capacity of the refrigerated container 9 is obtained in the same way as when the vehicle is running. Since the compressor 13 is driven by the variable frequency AC output of the inverter device 12, the refrigeration capacity of the refrigeration unit 8 (that is, the refrigeration temperature inside the container) can be varied. That is, the inverter device 12
If the output frequency of the compressor 13 is lowered, the compressor 13 will be operated at a lower rotating speed, and the refrigerating capacity of the refrigerating unit l-8 will be reduced. Conversely, if it is desired to keep the temperature inside the container 9 lower, the refrigeration capacity of the refrigeration unit 8 can be increased by increasing the output frequency of the impark device 12 and increasing the rotational speed of the compressor 13.

〔Effect of the invention〕

As described above, according to the present invention, the FRS motor for driving the refrigerating compressor and saucer is configured so that it can be operated by the power source outside the refrigerating vehicle, so that when the refrigerating capacity inside the refrigerating container is maintained when the vehicle is stopped, only the engine is required. Since there is no need to drive a generator to supply power to the electric motor, it is possible to 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 impark device, the refrigerating capacity can be kept constant regardless of the vehicle speed, and the refrigerating temperature inside the container can be set at will. can get.

[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 an external view of a vehicle incorporating a conventional container refrigeration system. 1 is an engine, 10 is an optical machine, 11 is a rectifier, 12 is an inverter device, 14 is a refrigeration unit, and 15 is a commercial power source. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] A refrigeration unit with a built-in electric motor for driving a refrigeration compressor, a generator driven by the power of the vehicle engine, an inverter device that converts the frequency of the generator output and inputs it to the electric motor, and a refrigeration unit that converts the frequency of the generator output and inputs it to the electric motor, A refrigeration system for a vehicle-mounted container, comprising: an external power input device that supplies an input voltage to the system from an external power supply.