JPS636393B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a DC cooling system for a vehicle that is driven by a DC power source and has distributed equipment.

BACKGROUND ART Conventionally, the cooling system of an electric vehicle, which can only be powered by DC power, is generally driven using a constant voltage AC auxiliary power supply device that converts DC to AC. However, while these methods do not pose much of a problem in terms of the cost of auxiliary power supply and equipment space for large vehicles, in the case of small vehicles such as monorail cars and streetcars on medium-sized tracks, each vehicle Due to the high cost of installing a small-capacity auxiliary power source and the problem of space required to install a cooling device, there is an increasing demand for direct drive from a high-voltage DC power source. However, when comparing the cooling device itself with one driven by an AC power source, it is larger in size and heavier, and the area it occupies when mounted on a vehicle or the weight of the vehicle becomes a problem. Furthermore, since the air conditioner is used only during the summer out of the four seasons, there is a problem in that it is dead weight during other seasons and is not energy-saving.

In view of these problems, the present invention has been developed to reduce the weight of equipment for cooling equipment by using the DC electric motor for the air compressor, which is an air brake pressure source used in DC electric vehicles, as the power source for compressing refrigerant or for the condenser fan. The purpose of this system is to reduce the amount of space it occupies as well as to reduce the amount of space it occupies, and is characterized by the distributed arrangement of refrigerant compression and condensation equipment and coolers.

An embodiment of the present invention will be described in detail with reference to the drawings. 1 is a high-pressure DC motor, 2 is an air compressor for air brakes, and the DC motor 1 is connected to the front output shaft 1.
2. It is intermittently driven as needed via the magnetic clutch 3a. Reference numeral 4 denotes a refrigerant compressor, which is continuously driven by the DC motor 1 via a rear output shaft 13. A condenser 5 serves to liquefy high-pressure refrigerant gas, and its cooling operation is performed by a condenser fan 7. The figure shows an example in which the condenser fan 7 is driven by a belt from the rear output shaft 13. 15 is a capillary tube that functions as an expansion valve. Reference numeral 10 denotes a cooler having the function of gasifying refrigerant at a low temperature and low pressure, and an evaporator fan 9 performs ventilation and heat exchange in this cooler 10 to obtain cold air. Reference numeral 14 denotes a cooling duct installed in the ceiling of the vehicle, which uniformly distributes cool air inside the vehicle.
Since the evaporator fan 9 is installed in a limited space on the vehicle ceiling, it is required to be lightweight and compact.
Also, relatively low output is sufficient. Therefore, an AC motor 8 driven by an AC power source obtained from a motor generator 6 is used as its drive source, and is distributed and driven by a separate power source. Reference numeral 16 indicates the position of the underframe of the vehicle, and the area above it is above the floor, and the area below it is under the floor. 11 is a heat-insulated refrigerant pipe, 18 is an unload circuit 19
17 is the air compressor 2 and the switching valve 18
It is a controller that controls the operation of the

In the above configuration, the operating rate of the air compressor 2 for the air brake is about 30% or less of the continuous operation rate, and the operating time is usually about 1 minute, so the operating rate is low. In the present invention, the DC motor 1 is used for both the power of the air compressor 2 and the power for compressing refrigerant, and its power capacity is set to the capacity of either of them, thereby achieving miniaturization. That is, since the operation of the air compressor 2 is intermittent as described above, the air compressor 2 is used between cooling operations. Incidentally, if both are operated at the same time, the load will be overloaded, so it goes without saying that one should not be operated when the other is operated.

Intermittent use of the cooling system means that the air compressor 2
Considering the driving pattern of the car, the number of times the in-vehicle thermostat is turned on and off will only increase slightly, so there will be no real harm. Incidentally, output switching of the DC motor 1 is performed by magnetic clutches 3a and 3b. In this embodiment, when the air compressor 2 is in operation, the magnetic clutches 3a and 3b are turned on and off, respectively, or the unload circuit 19 for no-load operation is activated by the selector valve 18, and the refrigerant compressor 4 is turned on and off.
It is sufficient to operate the unit without load. Furthermore, when the air compressor 2 is stopped, the magnetic clutch 3b is turned on to allow the cooling device to operate continuously. The magnetic clutch 3b is also used to release the air conditioner when the air conditioner is not in use.

In the illustrated embodiment, the condenser fan 7 is driven by a belt using the DC motor 1 as the power source.
Like the evaporator fan 9, it is also possible to change to an AC power source drive.

As described above, the present invention provides two independent output systems for the DC motor that drives the air compressor, and provides a magnetic clutch or a refrigerant unload circuit on the refrigerant compression side for these two drive circuits to compress the air. Since the air conditioner and the air conditioner are not driven simultaneously and a single power source is used for both, the weight of the vehicle and the cost of the air conditioner can be reduced. In addition, the refrigerant compressor, which consumes a lot of power in the cooling system, is driven by a DC motor, and the evaporator fan, which consumes relatively little power, uses an AC power supply, and the cooler circuit and condensation and compression circuits are installed separately. This has the effect of making the cooling device smaller and lighter.

[Brief explanation of the drawing]

The figure is an equipment layout diagram showing one embodiment of the present invention. 1...DC motor, 2...Air compressor, 3a,
3b... Magnetic clutch, 4... Refrigerant compressor, 5... Condenser, 6... Motor generator, 7... Condenser fan, 8... AC motor, 9... Evaporator fan, 10... Cooler , 14... Cooling duct.

Claims (1)

[Claims] 1. In a vehicle cooling system powered by a DC power source, the power system of the refrigerant compression or liquefaction circuit of the refrigeration cycle is connected to the brake compressed air power source via a switching device, and the cooler and A direct current cooling system for a vehicle, characterized in that a condenser and a compressor are distributed over and under the floor of the vehicle, respectively. 2. The DC cooling device for a vehicle according to claim 1, wherein the refrigerant piping circuit is provided with an unload circuit.