JPH09142131A - On-vehicle air-conditioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce incurring a heat loss by disposing a blast duct in a cabin. SOLUTION: An air-conditioning unit 2 arranged at the side of a seat and a blast duct 5 to guide blast air from the air-conditioning unit 2 to a supply opening switching box arranged in front of the inside of a cabin are contained in a unit space 24 and a dust space 25 formed in such a manner that the floor 3a of a cabin is recessed. The spaces are installed in such a state that an air layer with a size of, for example, approximately 10mm is ensured between respective wall surfaces of which the unit space 24 and the duct space 25 consist. Further, a flange part 5a expending to the outside along the two side parts of an upper surface and a gap between the side of the duct space 25 and the upper surface plate is closed with the flange part 5a, which is fixed on the floor 3a of the cabin by means of a screw.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-vehicle air conditioner mounted on vehicles for various work machines.

[0002]

2. Description of the Related Art Conventionally, in an air conditioner mounted on a vehicle for various working machines such as a vehicle for a construction machine or a vehicle for an agricultural machine, since the space inside the cabin is small, an air conditioner unit is arranged under or behind the seat. A blower duct that guides blown air from the air conditioning unit to the air outlet opening to the front of the cabin is provided under the floor of the cabin to the front of the cabin.

[0003]

However, since the blower duct is arranged under the floor of the cabin, that is, outside the room, heat loss in the blower duct becomes large. Therefore, it is necessary to cover the outer periphery of the blower duct with a heat insulating material. However, it is necessary to thicken the heat insulating material in order to keep the heat loss low. In this case, not only the space under the cabin floor is pressed, but also the cost is increased. Further, since it is necessary to form a through hole in the wall surface of the cabin in order to dispose the air duct outside the room, it is difficult to ensure the airtightness of the cabin. The present invention
The present invention has been made based on the above circumstances, and an object thereof is to provide an in-vehicle air conditioner in which a ventilation duct is arranged inside a cabin to reduce heat loss.

[0004]

According to the invention of claim 1, the air duct is housed in a duct space formed by denting the floor of the cabin, and between the wall surface and the air duct forming the duct space. Since the air layer is secured in the air conditioner, the air layer plays a role of a heat insulating material, so that the heat loss from the air duct can be suppressed without using the heat insulating material. Further, since the heat radiation from the blower duct contributes to the heating effect inside the cabin as it is, the heat loss can be reduced as compared with the case where the blower duct is arranged outdoors and the heat insulating material is used. Further, by disposing the air duct in the cabin, it is not necessary to make a through hole in the wall surface of the cabin, and the airtightness in the cabin can be easily ensured.

According to the second aspect of the present invention, the flanges provided along both sides of the upper surface of the blower duct close the gap formed between the side surface of the duct space and dust, small articles or the like enter the air layer. Can be prevented.

According to the third aspect of the invention, like the air duct, the air conditioning unit is housed in a unit space formed by denting the floor of the cabin, and between the wall surface and the air conditioning unit forming the unit space. By securing an air layer in the air conditioner, heat loss from the air conditioning unit can be suppressed.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an on-vehicle air conditioner of the present invention will be described with reference to the drawings. FIG. 1 is an overall perspective view of an on-vehicle air conditioner. The vehicle-mounted air conditioner 1 according to the present embodiment is mounted on a work machine vehicle (for example, a tractor).
As shown in FIG. 2, an air conditioning unit 2 that controls the temperature of the blown air, a blowout port switching box 4 provided in front of the interior of the cabin 3, a blower duct 5 that guides the blown air from the air conditioning unit 2 to the blowout port switching box 4, and The air conditioning unit 2 is composed of an under-seat duct 8 that guides blown air to an air outlet 7 that opens below the seat 6.

The air conditioning unit 2 is arranged beside the seat 6 in the cabin 3 and, as shown in FIG. 2, a blower 9 for generating blown air, a cooling heat exchanger 10, a heating heat exchanger 1
1, an air mix damper 12 for adjusting the amount of air bypassing the heating heat exchanger 11, a damper 13 for adjusting the amount of air (warm air) supplied to the under-seat duct 8 and the like. The cooling heat exchanger 10 is a refrigerant evaporator of a refrigeration cycle (not shown), and cools the air blown by the blower 9 by heat exchange with a low-temperature refrigerant. The heat exchanger 11 for heating is arrange | positioned downstream (leeward) of the heat exchanger 10 for cooling, and heats the air which passes by heat exchange with the engine cooling water which circulates inside. In addition, in the hot water pipe 14 for circulating the engine cooling water in the heating heat exchanger 11,
A valve 15 that adjusts the flow rate of the engine cooling water in conjunction with the opening degree of the air mix damper 12 is provided.

The outlet switching box 4 includes a defroster outlet 17 that blows air to the windshield 16 (see FIG. 1), a face outlet 18 that blows air to the upper half of the occupant, and a foot blow that blows air to the feet of the occupant. The outlet ducts 20, 21, and 22 that communicate with the outlets 19 are respectively connected to each other, and an outlet switching damper 23 for switching the outlets 17 to 19 is provided inside the box. The air duct 5 is
The air conditioning unit 2 arranged beside the seat 6 and the air outlet switching box 4 provided in front of the interior of the cabin 3 are connected to each other, and blown air whose temperature is adjusted by the air conditioning unit 2 is supplied to the air outlet switching box 4. Supply.

The air conditioning unit 2 and the air duct 5 are
As shown in FIG. 3, the space between the unit space 24 formed by denting the floor surface 3a of the cabin 3 and the duct space 25 and the wall surface forming the unit space 24 and the duct space 25 is, for example, 10 mm. It is installed with a certain degree of air layer A (see FIG. 4) secured. Further, the blower duct 5 is provided with a flange portion 5a protruding outward along both sides of the upper surface, and the flange portion 5a closes a gap formed between the side surface of the duct space 25 and the floor surface of the cabin 3. It is fixed to 3a with screws or the like (see FIG. 4). The air conditioning unit 2 may also be provided with a flange similar to that of the air duct 5.

(Effect of this embodiment) In this embodiment, the duct space 2 is formed by denting the floor surface 3a of the cabin 3.
5, the air duct 5 is housed, and the duct space 2
By ensuring the air layer A between the wall surface forming the air blower 5 and the blower duct 5, the air layer A plays a role of a heat insulating material, so that heat loss from the blower duct 5 can be achieved without using a heat insulating material. Can be suppressed. Further, since the heat radiation from the blower duct 5 directly contributes to the heating effect inside the cabin 3, the heat loss can be reduced as compared with the case where the blower duct 5 is arranged outdoors and a heat insulating material is used. Specifically, comparing the heat loss amount from the blower duct 5 between the conventional case using the heat insulating material and the case of this embodiment, as shown in FIG.
The larger the difference between the outside air temperature and the blowout temperature of the air conditioning unit 2, the larger the heat loss amount in the conventional case where the blower duct 5 is arranged outdoors. As a result, even if the heating heat exchanger 11 is reduced in size by the amount of heat loss reduction, it is possible to obtain the same heating effect as the conventional one. Further, since the heat insulating material is not required, the cost can be reduced and the space can be reduced as compared with the conventional case in which the blower duct 5 is arranged outdoors and the heat insulating material is used.

Furthermore, since the air duct 5 is arranged in the cabin 3 together with the air conditioning unit 2, it is not necessary to form a through hole for taking out the air duct 5 on the wall surface of the cabin 3, so that the airtightness in the cabin 3 is improved. Can be easily secured. The brim portions 5a provided along both sides of the upper surface of the blower duct 5 close a gap formed between the air duct A and the side surface of the duct space 25, so that dust and small articles can be prevented from entering the air layer A.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of an on-vehicle air conditioner.

FIG. 2 is an overall schematic diagram of an in-vehicle air conditioner.

FIG. 3 is a perspective view of an air conditioning unit and a ventilation duct.

FIG. 4 is a cross-sectional view showing a state in which a blower duct is housed in a duct space.

FIG. 5 is a graph comparing the amount of heat loss from the air duct between the conventional example and the present embodiment.

[Explanation of symbols]

 1 Car Air Conditioner 2 Air Conditioning Unit 3 Cabin 3a Floor 5 Air Duct 5a Collar 17 Defroster Outlet 18 Face Outlet 19 Foot Outlet 24 Unit Space 25 Duct Space A Air Layer

Claims (3)

[Claims] 1. An air-conditioning device for air-conditioning the inside of a cabin of a vehicle for various work machines, the air-conditioning unit being installed inside the cabin for controlling the temperature of blown air, and the blower air whose temperature is adjusted by the air-conditioning unit. A blower duct that guides air to a blowout opening that opens to the front inside the cabin, the blower duct being housed in a duct space formed by denting the floor surface of the cabin, and forming the duct space. The air conditioner for a vehicle, which is installed in such a manner that an air layer is secured between the wall surface and the wall surface. 2. The blower duct is provided with a flange portion projecting outward along both sides of an upper surface, and the flange portion is provided in the duct space in a state in which a gap formed between the flange portion and a side surface of the duct space is closed. The in-vehicle air conditioner according to claim 1, which is housed. 3. The air conditioning unit is housed in a unit space formed by denting the floor surface of the cabin,
3. The vehicle air conditioner according to claim 1, wherein the air conditioner is installed in such a manner that an air layer is secured between the wall surface and the wall surface forming the unit space.