JPH01317868A - Vehicle air conditioner - Google Patents

Abstract

PURPOSE:To provide center of gravity at a low position while ensuring a space for installing apparatus under a floor by disposing an indoor unit on the central portion of the floor in a vehicle in an air conditioner consisting of an outdoor unit and the indoor unit. CONSTITUTION:An outdoor unit 4 of an air conditioner is mounted on a roof in a position near both ends of a vehicle 1 employing a Heidegger structure, while indoor units 5 (5a, 5b) are installed between upper and lower floors 2, 3 of a compartment floor of the vehicle 1 (within the floor). Refrigerant pipe lines of both units 4, 5 are connected to each other by a communicating pipe 6. Also,, the widthwise central portion of the upper floor 2 is constituted one stage lower to form a path 7 extending longitudinally of a car body and dispose each indoor unit 5 on both sides of said path 7. Further, under a side structure 8 of side face of the vehicle is provided an air conditioning duct 9 extended longitudinally of the vehicle to be connected each to an air conditioning air outlet side of indoor unit 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a vehicle air conditioner, and particularly relates to a vehicle air conditioner suitable for vehicles traveling at high speed.

[Conventional technology]

Conventional air conditioners for vehicles generally have an integrated air conditioner mounted on the roof (or under the floor) as described in Japanese Utility Model Publication No. 60-10178.

[Problem to be solved by the invention]

The above conventional devices do not give sufficient consideration to increasing the speed of the vehicle, placing equipment under the floor, and uniformizing the temperature distribution inside the vehicle. There was a problem.

That is, when the air conditioner is mounted as an integrated unit on the roof, the center of gravity of the vehicle becomes high, which is disadvantageous in terms of ensuring stability during high-speed driving. Additionally, if you attempt to install the air conditioner as an integrated unit under the floor, you will not be able to secure space for other equipment installed under the floor. This tendency is particularly strong in car models that have many underfloor devices, such as trains. Furthermore, when two or more integrated air conditioners are installed on the roof (or under the floor), it is difficult to uniformly distribute cold air or sea breeze (hereinafter simply referred to as conditioned air), making it difficult to achieve a uniform indoor temperature distribution. there were.

An object of the present invention is to provide a vehicle air conditioner suitable for lowering the center of gravity of a vehicle.

[Means to solve the problem]

The above purpose is achieved by adopting an air conditioning system in which the air conditioning equipment is divided into an outdoor unit on the roof and an indoor unit in the middle of the floor, and each unit is connected with a connecting pipe.

This is achieved by placing indoor units in the floor on both sides of the aisle.

[For production]

In the vehicle air conditioner of the present invention, by arranging the outdoor unit on the roof and the indoor unit in the floor, it is possible to lower the center of gravity and secure equipment installation space under the floor.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. In the figure, 1 is a vehicle, 2 is an upper floor forming a cabin floor of the vehicle 1 which employs a high-depth car structure, and 3 is a lower floor formed below the upper floor 2. 4 is an outdoor unit mounted on the roof of the vehicle 1 near both ends thereof. 5 Otori.

5b is an indoor unit installed between the upper floor 2 and the lower floor 3 (that is, in the floor). 6 is the outdoor unit 4
This is a communication pipe for connecting a refrigerant pipe line between the indoor unit 5 and the indoor unit 5. The 1M outdoor unit 4 has outdoor equipment for two refrigeration cycles, and each refrigeration cycle is connected to its corresponding indoor unit 5a, 5b by a connecting pipe 6. Reference numeral 7 denotes a passage formed by configuring the center portion of the upper floor 2 in the width direction of the vehicle body to be one step lower in the longitudinal direction of the vehicle body. 8 is a side structure forming a side surface of the vehicle l. 9 is an air conditioning duct that runs through the lower part of the side structure 8 in the longitudinal direction of the vehicle body;
Indoor units 5a and 5b installed on both sides of the passage 70
This is for supplying the conditioned air supplied from the indoor units 5a and 5b in the longitudinal direction of the vehicle body. Reference numeral 10 denotes a rising duct connected to the air conditioning duct 9, which is perpendicular to the air conditioning duct 9 and extends to the upper, middle and lower parts.

Upper air outlet 11. It has a middle air outlet 0 and a lower air outlet B. 14 is the indoor unit 5a, 5 on both sides of the passage 70.
This is a return port provided at a position corresponding to b. Takumi is a cross beam of the underframe of the vehicle, which is the main strength member constituting the vehicle 1, and at the same time is a mounting member for the underfloor equipment.
supporting the Reference numeral 16 denotes a main strength member constituting the vehicle 1 with a gable structure.

Next, the refrigeration cycle will be explained. 4 is a compressor;
If is installed in the outdoor unit 4. 4 is a four-way switching valve, which, like the compressor 4, is installed inside the outdoor unit 4. The outdoor heat exchanger is equipped with an outdoor fan, which exchanges heat with the outside air blown by the outdoor fan. 2 is a pressure reduction mechanism, 2 is an indoor heat exchanger, and 27 is an indoor fan, which are installed in the indoor unit 5. The grave is a joint for connecting each refrigerant pipe of the outdoor unit 4 or the indoor unit 5 and the communication pipe 6. The connecting pipe 6 is connected to the side structure 8 or end structure 16 of the vehicle.
Furthermore, there is a partition between the guest room and the access platform! ! (not shown) etc.

Next, the operational status of the above configuration will be explained.

First, let's talk about cooling operation.

High pressure discharged from the compression 1a21 of the outdoor unit 4.

The high-temperature refrigerant enters the outdoor heat exchanger 2 through the solid line flow path of the four-way switching valve 4, and is cooled and liquefied by exchanging heat with the outside air supplied by the outdoor fasis. Then, the liquid refrigerant passes through the communication pipe 6 and enters the pressure reducing mechanism 5 housed in the indoor unit 5, where it is depressurized, becomes a gas-liquid mixed refrigerant, and enters the indoor heat exchanger #126. Thereafter, in the process of passing through the indoor heat exchanger, the refrigerant exchanges heat with the circulating air from the room and evaporates, performing a cooling effect. The refrigerant thus evaporated passes through the four-way switching valve n of the outdoor unit 40, returns to the pressure J1 machine 4, is compressed again, and repeats the above-described operation.

On the other hand, when viewed from the air side, the circulating air entering from the return port 14 is cooled by exchanging heat with the refrigerant in the indoor unit 50 and indoor heat exchanger 5, and enters the air conditioning duct 9.
distributed in the longitudinal direction of the vehicle l. The air is then blown into the room from the air conditioning duct 9 through the riser duct 1O and from the upper air outlet 11 and the middle air outlet 0, as shown by the solid line arrow, thereby uniformly cooling the room.

Next, during heating operation, the high-pressure, high-temperature refrigerant that exits the compressor 4 of the outdoor unit 4 passes through the dotted line flow path of the four-way switching valve B, and passes through the connecting pipe 6 to heat the indoor unit 5. The refrigerant enters the exchanger section and exchanges heat with the circulating air supplied by the indoor fan n to condense and liquefy while performing a warming effect. Thereafter, the liquid refrigerant enters the pressure reducing mechanism 5, where it is depressurized, becomes a gas-liquid mixed refrigerant, and enters the outdoor heat exchanger n.

Here, it exchanges heat with the outside air supplied by the outdoor fan, vaporizes it, becomes a gas refrigerant, and returns to the compression fill via the four-way switching valve n.

Looking at this from the air side, the circulating air that enters from the return port 14 is heated by exchanging heat with the refrigerant in the indoor heat exchanger 5, enters the air conditioning duct 9, and is distributed in the longitudinal direction of the vehicle l. , through the rising duct 10, and is blown into the room from the lower air outlet 13 and the middle air outlet ν as shown by the dotted arrows, uniformly heating the room.

According to configuration 2, the air conditioner is divided into an outdoor unit 4 and an indoor unit 5, and the outdoor unit 4 is installed on the roof, which reduces the space required for the vehicle body compared to a configuration in which the entire air conditioner is installed on the roof. The weight of the upper part can be reduced and the center of gravity of the vehicle can be lowered. In addition, the indoor unit 5 is installed on the upper floor 2.
By installing it between the floor and the subfloor 3, the space under the floor is not occupied, so that a sufficient installation space for the underfloor equipment can be secured.

Further, the indoor units 5a and 5b are installed on both sides of the vehicle body in the width direction across the passageway 7, and when looking at the entire vehicle 1, there are two installed at four locations. Therefore, unlike the conventional central air conditioner, there is no need to provide a large duct to distribute conditioned air into the cabin, and the configuration can be simplified.

To explain in detail, an air conditioning duct 9 and a rising duct 10 are installed at the lower part of the side structure 8 from each indoor unit 5a, 5b.
It is configured to supply conditioned air into the cabin through the duct, and each duct does not need to be installed over the entire length in the longitudinal direction outside the vehicle (the configuration can be simplified).

Further, according to the above-described configuration, each discharge port of the rising duct 10, that is, the upper discharge port 11.
Since the route from the middle discharge ON to the lower discharge port 13 can be shortened, pressure loss can be reduced.

Further, the rising duct 10 has an upper discharge port 11. There are three outlets for conditioned air: the middle outlet ν and the lower outlet 14. During cooling, the air is discharged from the upper outlet 11 and the middle outlet ν, and during heating, the air is discharged from the middle outlet 0 and the lower outlet 13. Conditioned air is supplied into the cabin, and the conditioned air can be uniformly supplied into the cabin, thereby suppressing temperature non-uniformity.

In the above embodiment, the outdoor unit 4 is provided with two outdoor devices with refrigeration cycles, and each outdoor device is connected to the indoor units 5a and 5b.
A similar effect can be obtained even if one outdoor unit is used as the outdoor equipment of the refrigeration cycle, and the refrigerant piping is branched to connect the two indoor units.

Next, another embodiment of the air conditioner according to the present invention will be described with reference to FIG. In the same figure, the same reference numerals as in the previous embodiment indicate the same members. This embodiment differs from the previous embodiment in that the compressor 4 is installed inside the indoor unit 5.

Therefore, the outdoor unit 4 is composed of an outdoor heat exchanger and an outdoor fan.

According to such a configuration, the outdoor unit 4 installed on the roof is composed of an outdoor heat exchanger and an outdoor fan, and since it is a minimum number of equipment, the vehicle The center of gravity of l can be further lowered.

Moreover, the outdoor unit 4 itself can be made compact, which is advantageous especially in a vehicle 1 having a compact car structure where there is little space for installing equipment on the roof.

〔Effect of the invention〕

As explained above, according to the present invention, the center of gravity of the vehicle can be lowered (8).

[Brief explanation of the drawing]

Figure sI is a side view of a vehicle equipped with an air conditioner according to an embodiment of the present invention, Figure 2 is a plan view of Figure 1, and Figure 3 is a vehicle body width showing the installation status of the air conditioner in Figure 1. 4 is a perspective view showing each duct connected to the indoor unit of the air conditioner, FIG. 5 is a circuit diagram showing the refrigeration cycle of the air conditioner shown in FIG. 1, and FIG. 6 is an air conditioner according to the present invention. FIG. 3 is a circuit diagram showing a refrigeration cycle of another embodiment of the device. l...Vehicle, 2...Upper floor, 3...
・Bottom floor, 4...Outdoor unit l', 5a, 5b・
...Indoor unit, 6゛...Connection pipe,
7...Aisle O1 Figure 4 5b Figure 4 71'' 5 Figure O2

Claims (6)

[Claims] 1. What is claimed is: 1. A vehicle air conditioner comprising an outdoor unit and an indoor unit, characterized in that the indoor unit is disposed in the middle of the floor of the vehicle. 2. A vehicle air conditioner comprising an outdoor unit installed on the roof of a vehicle, an indoor unit installed in the middle of the floor of the vehicle, and a connecting pipe connecting refrigerant piping between the outdoor unit and the indoor unit. . 3. In a vehicle air conditioner composed of an outdoor unit and an indoor unit, the outdoor unit is installed on the roof of the vehicle, the indoor unit is placed on both sides in the width direction of the vehicle body in the middle of the floor, and the outdoor unit and each of the outdoor units are connected to each other. A vehicle air conditioner characterized in that a refrigerant pipe with a unit is connected by a connecting pipe. 4. In a vehicle air conditioner composed of an outdoor unit and an indoor unit, the indoor unit is installed in the middle of the floor, and connected to an air conditioning duct installed in the longitudinal direction of the vehicle body below the side structure of the vehicle. An air conditioner for a vehicle, characterized in that a riser duct installed in a vertical direction and having a discharge port into a room is connected to the riser duct. 5. A vehicle air conditioner comprising an outdoor unit and an indoor unit, wherein the outdoor unit is installed on the roof of the vehicle and comprises at least an outdoor heat exchanger and an outdoor fan. 6. A piping structure for a vehicle air conditioner, characterized in that a connecting pipe connecting refrigerant piping between an outdoor unit installed on the roof of the vehicle and an indoor unit installed in the middle of the floor is installed along a frame forming the vehicle body. .