JPH08188032A - Vehicular air-conditioning system - Google Patents

Abstract

PURPOSE: To enable foreign matter accumulating in the lower inside portion of a heat exchanger to be readily washed off and removed by splitting a frame into a main body and a portion corresponding to the bottom of the heat exchanger, and making the portion corresponding to the bottom tree to be attached to and removed from the main body, in a vehicular air-conditioning system having the heat exchanger mounted inside the frame. CONSTITUTION: In a vehicular air-conditioning system, such as for a bus, a fin-and-tube type condenser 13 and a radiator 31 are placed inside a frame 40. During cooling operation, outside air is sucked into the frame 40 from an inlet port 41 through a grid 42 by the driving of a condenser fan 12 by a subengine 10, exchanges heat with engine-cooling water during the process of flowing through the radiator 31, and cools the subengine 10 during the process of flowing around the subengine 10. In this case, the frame 40 is split into a main body 40a and a portion 40b corresponding to the bottom; the portion 40b corresponding to the bottom is freely removably attached to the main body 40a with hinge screws 44 so that by removing the portion 40b corresponding to the bottom, the inside of the frame 40 can be cleaned.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning system for vehicles such as buses.

[0002]

2. Description of the Related Art An example of a conventional bus air conditioner is shown in FIGS. As shown in FIG. 2, the bus body 10
An air conditioner unit 1 is mounted below 0. Cooling ducts 4 extend in the front-rear direction on both sides near the ceiling of the passenger compartment 2, and heating ducts 6 extend in the front-rear direction on both sides near the floor of the passenger compartment 2.

During the cooling operation, the cold air generated by the air conditioner unit 1 branches via the underfloor duct 22 and enters the cooling duct 4 through the pair of rising ducts 3 and a switching damper (not shown) interposed therebetween. The air is blown into the vehicle interior 2 from the air outlets 5 formed in the cooling duct 4 at a predetermined interval.

During the heating operation, the warm air generated in the air conditioner unit 1 enters the heating duct 6 through the underfloor duct 22, the rising duct 3 and the switching damper, and the heating duct 6 is heated.
The air is blown into the vehicle interior 2 from the air outlets 8 formed at predetermined intervals.

A system diagram of the bus air conditioner is shown in FIG. A sub-engine 10, a compressor 11, a fan motor 30, a casing 17 and the like are installed in the air conditioner unit 1. Inside the casing 17, an evaporator 16, a heater coil 18, an evaporator fan 9, and an inside / outside air damper 19 are provided.
And so on.

Eva engine during cooling operation and dehumidifying operation
10 is driven, and the compressor 11 and the condenser fan 12 are driven by the sub engine 10. At the same time, the pulley 23, belt 24, magnet clutch 25, fan motor 30, drive shaft 26, pulley 27, belt 28,
The evaporator fan 9 is driven via the pulley 29.
At this time, the fan motor 30 simply functions as a bearing, and the engine cooling water of the sub engine 10 is cooled by the radiator 31.

When the compressor 11 is driven, the refrigerant discharged from this compressor 11 enters the condenser 13,
Here, the condenser fan 12 radiates heat to the outside air to condense and liquefy it. The liquid refrigerant enters the evaporator 16 via the receiver 14 and the expansion valve 15, where it is evaporated and vaporized by exchanging heat with the air inside the vehicle or the outside air blown by the evaporator fan 9, and then returns to the compressor 11.

When the evaporator fan 9 is driven, the vehicle compartment air or the outside air is sucked into the casing 17 from the inside air inlet 20 or the outside air inlet 21 selected by switching the inside / outside air damper 19. The air sucked into the casing 17 becomes conditioned air by passing through the evaporator 16 and the heater coil 18, is urged by the evaporator fan 9, and then is blown into the vehicle interior 2 from the outlet 37 through a duct (not shown). To be done.

During the heating operation, the sub engine 10 is stopped and the fan motor 30 is driven. When the fan motor 30 is driven, the power from this is transmitted to the evaporator fan 9 via the drive shaft 26, the pulley 27, the belt 28, and the pulley 29 to rotate it. At this time, the magnet clutch 25 is disengaged.

At the same time, the on-off valves 35 and 36 are opened, so that part of the high-temperature engine cooling water flowing out from the main running engine 32 is supplied to the heater coil 18 via the on-off valve 36 and the flow control valve 38. Then, after radiating heat to lower the temperature, it returns to the main engine 32 through the on-off valve 35. Most of the high-temperature engine cooling water enters the radiator 34 where it radiates heat to the outside air blown by the radiator fan 33 and then returns to the main engine 32.

[0011]

When the above-mentioned conventional air conditioner is operated, the outside air flows through the condenser 13 and the radiator 31, and the sand and dust contained in the outside air adhere to the surfaces of the fins and tubes thereof. When such earth and sand and dust accumulate, the flow resistance of the outside air flowing through the condenser 13 and the radiator 31 increases and the heat transfer performance thereof deteriorates.
Then, the fins and tubes are corroded by the snow-melting agent such as calcium chloride contained in the earth and sand.

Therefore, it was recommended to periodically wash the condenser 13 and the radiator 31, but not only the washing work is troublesome and time-consuming, but also the lower portion of the condenser 13 and the radiator 31 is difficult to wash. Also, there is a problem that the fins and tubes are corroded by foreign matter such as earth and sand deposited on the lower part of the radiator 31 and the life thereof is shortened.

[0013]

The present invention has been invented to solve the above problems, and its gist is to provide a fin-and-tube type heat exchanger mounted in a frame. In a vehicle air conditioner that
In the vehicle air conditioner, the frame is divided into a main body and a portion corresponding to the bottom of the heat exchanger, and the portion corresponding to the bottom is detachable from the main body.

Another feature is that the bottom-corresponding portion can be attached and detached by screwing it to the main body.

[0015]

In the present invention, the bottom portion of the heat exchanger of the frame is removed from the main body and the lower portion of the heat exchanger is washed in this state.

[0016]

EXAMPLE A first example of the present invention is shown in FIG.
6B is a sectional view taken along the line AA of (B), and (B) is a sectional view taken along the line BB of (A). Inside the frame 40, a fin-and-tube type condenser 13 and a radiator 31 are arranged. A lattice 42 is attached to the suction port 41 of the frame 40, and the condenser fan 12 is disposed at the air outlet 43. The condenser fan 12 is driven by a sub engine 10 arranged behind it.

The frame 40 is divided into a body 40a and a bottom portion 40b of the condenser 13 and the radiator 31, and this bottom portion 40b is detachably attached by a thumbscrew 44.
Attached to. Other configurations are the same as those of the conventional one shown in FIGS.

However, when the sub-engine 10 is operated during the cooling operation of the air conditioner, the condenser fan 12 is driven, and the outside air is sucked into the frame 40 from the suction port 41 through the lattice 42 and the fins of the condenser 13 are driven. And after exchanging heat with the refrigerant flowing through the tube in the process of passing through the gap between the tubes, heat exchange with engine cooling water flowing through the tube during passing through the gap between the fins of the radiator 31 and the tube. . Then, the sub-engine 10 is cooled while being urged by the condenser fan 12 and blown out from the blow-out port 43 and flowing around the sub-engine 10.

When foreign matters such as earth and sand and dust contained in the outside air are accumulated on the surfaces of the fins and tubes of the condenser 13 and the radiator 31, the thumb screw 44 is unscrewed to remove the bottom-corresponding portion 40b from the main body 40a. And the frame
Water is sprayed from the bottom opening of 40, and the lower parts of the condenser 13 and the radiator 31 are washed with a brush. The upper portions of the condenser 13 and the radiator 31 are the suction port 41 as in the conventional case.
And it may be washed by spraying water from the air outlet 43.

Although the example in which the present invention is applied to cleaning the condenser 13 and the radiator 31 has been described above, the present invention can also be applied to cleaning the evaporator 16 and the heater coil 18.

[0021]

According to the present invention, since the portion of the frame corresponding to the bottom of the heat exchanger can be detached from the main body, foreign matters deposited in the lower portion of the heat exchanger can be easily and surely washed and removed. As a result, corrosion of the heat exchanger can be prevented,
The durability can be improved.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, (A) is a sectional view taken along line AA of (B), and (B) is a sectional view taken along line BB of (A).

FIG. 2 is a schematic perspective view of a conventional bus air conditioner.

FIG. 3 is a system diagram of a conventional bus air conditioner.

[Explanation of symbols]

 40 Frame 40a Main body 40b Bottom equivalent part 13, 31 Heat exchanger 12 Condenser fan 41 Suction port 43 Air outlet 44 Thumbscrew

Claims (2)

[Claims] 1. A vehicle air conditioner comprising a fin-and-tube type heat exchanger mounted in a frame, wherein the frame is divided into a main body and a heat exchanger bottom portion, and the bottom portion is divided into the above portions. A vehicle air conditioner characterized by being removable from the main body. 2. The vehicle air conditioner according to claim 1, wherein the portion corresponding to the bottom portion is detachably attached to the main body by screwing.