JPS6334975Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] The invention relates to a drain pipe structure for a vehicle air conditioner.
In particular, the present invention relates to a drain pipe structure for a vehicle air conditioner that can prevent backflow of air on the drain pipe side and also allow a drain pipe and a rainwater drain pipe to be collectively connected to one drain pipe.

[Technical background of the invention and its problems] In FIG. 1, reference numeral 1 indicates a vehicle air conditioner embedded in the ceiling of a vehicle 2. As shown,
Drain tray 4 provided below the indoor evaporator 3
A drain drain pipe 5 is connected to the drain pipe 5 for discharging the drain dripping to the outside. Also,
A rainwater drain pipe 7 is connected to the outdoor side blower 6 for draining rainwater that enters here to the outside. The drain pipe 5 and the rainwater drain pipe 7 were arranged independently and separately. In addition, the drain tray 4 is designed to prevent water from splashing due to air blowing up from the drain pipe 4 caused by a pressure difference between the air pressure inside the indoor heat exchange chamber 8 of the air conditioner 1 and the outside air pressure. A shielding plate 9 was provided for this purpose.

In addition, as shown in Fig. 2, when the bottom plate 10 of the air conditioner 1 is flat and drain pipes are installed in the width direction of the vehicle, drain pipes are installed on both the left and right sides of the vehicle 2, taking into consideration the inclination of the vehicle body. 5 and a rainwater drainage pipe 7 were installed.

By the way, if these drain drain pipes 5 and rainwater pipes 7 are collectively connected and integrated into one, the filter 12 for the suction port 11 of the indoor heat exchange chamber 8 of the air conditioner 1 will become clogged and the indoor There was a problem in that when the negative pressure inside the inner heat exchange chamber 8 became large, the air in the rainwater drainpipe 7 flowed back to the drain drainpipe 5 side, and drain water was no longer discharged. For this reason, in the past, it was not possible to collect the drain pipe 5 and the rainwater drain pipe 7 into one. For this reason, the work of outfitting the vehicle has become complicated and manufacturing costs have also increased.

[Purpose of the invention] The present invention has been devised in view of the above-mentioned problems and to effectively solve them.

The purpose of the present invention is to provide a drain pipe structure for a vehicle air conditioner that can prevent backflow on the drain pipe side and collectively connect a drain pipe and a rainwater drain pipe into a single drain pipe. be.

[Summary of the invention] This invention combines drain pipes and rainwater pipes to form a single drain pipe, and forms a trap on the upstream side of the drain pipe to prevent backflow. The above objective is achieved by constructing a drainage pipe structure.

[Embodiment of the invention] A preferred embodiment of the invention will be described below in detail with reference to the accompanying drawings.

As shown in FIG. 3, the vehicle air conditioner 21
It is installed embedded in the ceiling of 2. As shown in the figure, the air conditioner 21 is composed of an indoor unit 23 side and an outdoor unit 24 side, and these are partitioned by a casing 25 that forms the outer shell of the air conditioner 21.

On the indoor unit 23 side, an evaporator 27 and an indoor blower 28 are arranged in an indoor heat exchange chamber 26 formed in a housing 25. A duct 30 is connected to the blower 28 for supplying cool air to various parts of the vehicle interior 29, and a duct 30 is connected to the housing 25 at the most upstream side of the indoor heat exchange chamber 26 that it forms. A suction port 31 is formed to take in air. This suction port 31 is provided with an air filter 32, and a drain tray 33 is provided below the evaporator 27. A drain drain pipe 34 is connected to the drain tray 33 for discharging the drain dripping onto the drain tray 33 to the outside.

On the other hand, on the outdoor unit 24 side, outside air is passed through a refrigerant compressor (not shown) and an outdoor condenser (not shown) in the outdoor heat exchange chamber 35 formed by the casing 25 in order to promote heat radiation from the condenser. An outdoor side blower 36 and the like are provided for this purpose. Further, at the lower part of the casing 25 forming the outdoor heat exchange chamber 35, there is a rainwater drain pipe 37 for discharging rainwater entering the outdoor unit 24 side, that is, the outdoor blower 36 section, to the outside. It is connected.

By the way, the feature of the present invention is that the above-mentioned drain drain pipe 34 and the above-mentioned rainwater drain pipe 37 are respectively merged and connected to one drain pipe 38, and the back flow is prevented from flowing upstream of the drain drain pipe 34. This is because a trap 39 for prevention is formed.

As shown in the figure, the rainwater drain pipe 37 and the drain drain pipe 34 each extend outside along the longitudinal direction of the vehicle 22, and are joined here to form a single drain pipe 3.
8 are collectively connected. And this collective connection part 40
A trap 39 for preventing backflow is formed in the drain pipe 34 on the more upstream side.

As shown in FIGS. 3 and 4, the trap 39 has a water head pressure P ₂ due to its head H ₂ which is equal to the maximum static pressure Pa generated in the rainwater drain pipe 37 due to the operation of the outdoor fan 36 and the indoor side. The pressure difference between the minimum static pressure Pb (Pa>Pb) in the indoor heat exchange chamber 26 that occurs when the filter 32 of the heat exchange chamber 26 is clogged becomes greater than the differential pressure Pa−Pb (P ₂ >Pa−Pb) Like that difference
The dimensions of H ₂ are determined. And the drain drainage is
The trap 39 is configured to be drained by water pressure due to its own weight, which is generated by a head difference H ₁ between the height of the joint surface with the drain tray 33 and the height of the uppermost end of the trap 39 .

As is clear from the above description, the drain pipe structure of the vehicle air conditioner 21 according to the present invention can prevent backflow of air occurring in the drain pipe 34. Therefore, not only is it unnecessary to provide a shielding plate for preventing water from splashing on the drain tray 33, but also it becomes possible to collectively connect the drain drain pipe 34 and the rainwater drain pipe 37 to a single drain pipe 38. As a result, the number of drain pipes 38 installed on the vehicle 22 side can be reduced by half, simplifying the outfitting work of the vehicle 22, and reducing the cost spent on the drain pipes 38 as much as possible. .

As shown in FIG. 5, it is also possible to apply the drain pipe 34 and the rainwater drain pipe 37 to the left and right sides of the vehicle 22 in the vehicle width direction. It goes without saying that the drain pipe 34 and the rainwater drain pipe 37 may be connected in the vehicle 22 and the trap 39 may be formed in the drain pipe 34 upstream of the connecting portion 40.

[Effects of the invention] In summary, the present invention provides the following excellent effects.

(1) Backflow of air does not occur in the drain pipe, water can be prevented from splashing in the drain pan, and a shielding plate can be eliminated.

(2) Drain drain pipes and rainwater drain pipes can be collectively connected to a single drain pipe, making it possible to reduce the number of drain pipes installed on the vehicle side by half, and the cost associated with this. In addition to reducing the cost, outfitting the vehicle becomes easier, and manufacturing costs can be reduced as much as possible.

(3) The structure is simple and can be provided at low cost.

[Brief explanation of the drawing]

1 and 2 are schematic sectional views showing a conventional vehicle air conditioner and its drain pipe structure, and FIG. 3 is a schematic diagram showing a preferred embodiment of the vehicle air conditioner drain pipe structure according to the present invention. FIG. 4 is a partially enlarged view showing the trap portion, and FIG. 5 is a schematic cross-sectional view showing a modified example. In the figure, 1 and 21 are vehicle air conditioners, 2 and 22 are vehicles, 3 and 27 are evaporators, 4 and 33 are drain trays,
5, 34 are drain pipes, 6, 36 are outdoor blowers, 7, 37 are rainwater drain pipes, 38 are drain pipes, 39
is a backflow prevention trap.

Claims (1)

[Scope of utility model registration request] In the drain pipe structure of a vehicle air conditioner embedded in the ceiling of a vehicle, a drain drain pipe and an outdoor blower are used to discharge drain dripping into a drain pan provided below the indoor evaporator of the air conditioner to the outside. The rainwater drainage pipes for discharging rainwater entering the drain to the outside are joined together to form a single drainage pipe, and a trap for preventing backflow is formed on the upstream side of the drain pipe. Drainage pipe structure for vehicle air conditioners.