JPS6235927B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a vehicle air conditioner.

BACKGROUND ART A sub-engine-driven air conditioner using a sub-engine, which is a power source dedicated to air conditioning, is generally used as an air conditioner for buses.

A conventional sub-engine driven air conditioner has a sub-engine 2 on a frame 1, as shown in FIG.
A compressor 3, a condenser 4, a liquid receiver (not shown), a case 5 in which an evaporator 6 and a heating radiator 7 are installed and has an indoor air intake port 5a, a blower fan 8,
A hot water heater 10, a duct 11, etc. are attached to form an integrated air conditioning unit A, and the air conditioning unit A is removably mounted under the floor of the vehicle body. 8
etc. to blow cold air into the vehicle interior, and in winter, coolant (warm water) after cooling the main engine for driving (not shown) is supplied to the hot water heater 1 as needed.
Normally, the heated air is further heated at 0 and then guided to a heating radiator 7, and an electric motor 9 mounted on the frame 1 rotates a blower fan to blow hot air into the vehicle interior. , the blower fan 8 is connected to the sub engine 2 and the electric motor 9 as described above.
In order to be able to rotate the drive shaft of the sub-engine 2, pulleys 12 and 13, a V-belt 14 hooked thereon, an intermediate shaft 15, a pulley 16,
17, an electromagnetic clutch is provided at, for example, the pulley 16 of the power transmission system that connects to the rotating shaft 8a of the blower fan 8 via the V-belt 18 hung thereon, and
0. For example, an electromagnetic clutch is also provided at the pulley 20 part of the power transmission system that connects to the rotating shaft 8a of the blower fan 8 via the V-belt 21 hung thereon, and when one electromagnetic clutch is connected, the other electromagnetic clutch is connected. The clutch is disconnected to prevent both power transmission systems from interfering with each other.

In the above-mentioned slave device, the electromagnetic clutch is expensive and requires an electrical circuit for controlling the disconnection of the electromagnetic clutch, making it even more expensive. It changes in proportion to the change in rotation speed, so
When the sub-engine 2 is running at a low speed, that is, during weak cooling, the rotation speed of the blower fan 8 is low, the amount of air being blown is significantly reduced, and the cooling capacity per unit amount of air being blown increases, causing the outlet air temperature of the evaporator 6 to drop too low. There is a problem in that frost tends to form on the fan 6, and if an attempt is made to prevent the above frost formation by increasing the rotational speed of the fan 8, the power consumption increases significantly and the fuel consumption increases accordingly. Problems arise in that consumption increases and noise also increases.

The present invention aims to address the above-mentioned conventional problems, and the present invention addresses the second and third problems.
As shown in the embodiment of the figure, a plurality of ventilation fans (two in the illustration) are provided, and at least one of them is 8.
1 is configured to be rotationally driven by the sub-engine 2, and the remaining blower fans 82 are configured to be rotationally driven by a power source other than the sub-engine such as an electric motor 9 or a small engine. .

Further, in the present invention, the duct 11 on the downstream side of the blower fan
As shown in FIGS. 3 and 4, it communicates with the blower fan 81 on the side driven by the sub-engine 2, but also communicates with the duct 111 and the blower fan 82 on the side driven by a power source other than the sub-engine. duct 11
The air conditioning unit A When mounted under the floor of the vehicle body, the tip outlet 113a of the merging section 113 is connected to a cold air blowing duct (not shown) provided on the vehicle body side, and the outlet port 112a of one duct 112 is connected to the hot air blowing duct (not shown) provided on the vehicle body side. (not shown).

In Figures 2, 3, and 4, configurations other than the above are shown in Figure 1.
This is the same as the conventional device shown in the figure, and the same reference numerals as in FIG. 1 represent the same parts.

According to the present invention configured as described above, during cooling when the compressor 3 is driven by the sub-engine 2, one of the blower fans 81 is rotationally driven by the sub-engine 2, and air is sucked from the indoor air intake port 5a. The air is cooled in the evaporator 6, and the cold air is passed through the duct 11.
1, is sent from a confluence part 113 to a cold air blowing duct (not shown) on the vehicle body side, and is blown into the passenger compartment from many air outlets.

In this case, the valve 114 is opened on the merging portion 113 side and the outlet 112a is closed as shown by the solid line in FIG. 9, the blower fan 82 is also rotationally driven to supply cold air to the duct 112, and the confluence part 1
13 and is blown into the vehicle interior together with the cold air sent to the duct 111, providing a sufficient cooling effect and preventing frost formation on the evaporator 6.

During heating, the sub-engine 2 is stopped, hot water from the main engine is further heated by the hot water heater 10 and flows into the heating radiator 7, and one of the blower fans 82 is rotated by the electric motor 9, and the indoor air is heated. Indoor air sucked through the air intake port 5a is heated by the heating radiator 7 and flows into the duct 112 as warm air. During this heating, the valve 114 is closed on the merging portion 113 side, as shown by the chain line in FIG.
The a side is in the closed position, and the duct 112
The warm air that has flowed into the vehicle is sent from the outlet 112a to a hot air blowing duct on the vehicle body side, and is blown into the vehicle interior from many outlets to heat the vehicle interior.

In this way, in the present invention, by providing a plurality of blowing fans separately, including a blowing fan driven by the sub-engine and a blowing fan driven by power other than the sub-engine, each blowing fan can be mutually controlled. Because they are independently controlled without interference,
The conventional electromagnetic clutch and its control electric circuit are completely unnecessary, which not only allows for significant cost reductions, but also greatly increases the amount of air blown during cooling.
It is possible to improve the cooling capacity and prevent frost formation on the evaporator, and even if the rotation speed of each fan is significantly lowered, the same cooling capacity as before can be maintained, reducing the required power and reducing the fuel consumption associated with it. It is possible to reduce consumption and significantly reduce noise.

Furthermore, in the present invention, the valve 1 is closed during cooling and heating.
By setting the valve 14 at an intermediate position between the solid line and the chain line in FIG. 4, cold air or hot air can be blown out from both the cold air blowing duct and the hot air blowing duct, and the opening degree of the valve 114 can be adjusted. By this, it is possible to variably control the ratio of the amount of cold air or hot air blown out from the cold air blowing duct and the warm air blowing duct, and furthermore, by operating cooling and heating simultaneously, By controlling the hot water flow rate with a hot water flow rate control valve (not shown), it is also possible to adjust the temperature of the air blown into the room as appropriate, and it is possible to perform fine air conditioning temperature control according to outside air conditions.

Note that the present invention is not limited to an air conditioner for both heating and cooling, but can also be applied only to a cooling device for buses.

[Brief explanation of the drawing]

Figure 1 is a plan view showing an example of a conventional air conditioner;
The figure is a plan view showing an embodiment of the present invention, and FIG.
The figure is a view taken along line X-X, and FIG. 4 is a sectional view taken along line Y-Y in FIG. 1...Frame, 2...Sub engine, 3...
Compressor, 4...Condenser, 5...Case, 6...Evaporator, 7...Heating radiator, 81, 82...Blower fan, 9...Electric motor, 10...Hot water heater, 111 , 112... duct, 113... junction, 114... valve.

Claims (1)

[Scope of Claims] 1. In a sub-engine-driven vehicle air conditioner using a sub-engine as a dedicated drive source for the cooling device, a plurality of blowing fans for blowing cold air or warm air into the vehicle interior are installed, and the plurality of A vehicle air conditioner characterized in that at least one of the blower fans is rotationally driven by a sub-engine, and the remaining blower fans are rotationally driven by a drive source other than the sub-engine, such as an electric motor. . 2 The plurality of blower fans are connected to separate ducts, and the duct connected to the blower fan driven by the sub-engine communicates with the cold air blowing duct on the vehicle body, and is connected to the other blower fan. 2. The vehicle air conditioner according to claim 1, wherein the duct communicates with a hot air blowing duct on the vehicle body side, and the two ducts communicate and merge through a valve.