JP3726370B2 - Bus vehicle ventilation system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ventilation system for a bus vehicle.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a large-sized route bus, an outside air introduction port to a cooler is provided in a ceiling portion of a vehicle, and outside air is introduced from the outside air introduction port using ram pressure during vehicle travel. Further, the air in the passenger compartment is discharged from a ventilation port provided at the rear of the vehicle using the pressure in the passenger compartment.
[0003]
[Problems to be solved by the invention]
However, the above-described outside air introduction method has the following problems.
(1) Since the outside air inlet is provided in the ceiling of the bus vehicle, it is difficult to modify the vehicle because it is necessary to move the frame or the like in order to secure the vehicle body strength.
(2) Rainwater or snow may enter the passenger compartment from the outside air inlet.
(3) Since outside air is introduced using the traveling ram pressure, the amount of outside air introduced when the vehicle is stopped is insufficient.
(4) The vehicle interior cannot be sufficiently ventilated because there is no forced exhaust means.
The present invention has been made on the basis of the above circumstances, and its purpose is that the modification on the vehicle side is small, forced exhaust is possible, sufficient ventilation can be secured even when the vehicle is stopped, and infiltration of rainwater, snow, etc. The object is to provide a ventilation system for bus vehicles that can be prevented.
[0004]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a connecting duct capable of supplying outdoor air introduced by the defroster blower to the cold air duct. For this reason, since external air can be taken in into the duct for cold wind only by adding a connection duct, the vehicle side modification is easy. In other words, by using the outside air introduction port of the conventional defroster device, it is not necessary to provide the outside air introduction port on the ceiling of the vehicle, so that it is easy to ensure the vehicle body strength and there is no need to move the frame or the like. . In addition, there is no risk of rainwater, snow, etc. entering from the outside air inlet. Furthermore, since the outside air is introduced by the defroster blower, a sufficient amount of outside air can be secured even when the vehicle is stopped.
In addition, it is equipped with a ventilation opening that connects the inside of the duct for hot air and the outside of the passenger compartment, and an opening / closing door that opens and closes this ventilation opening, so it is compulsory by opening the ventilation opening with the opening / closing door and operating the heating fan In addition, the indoor air can be discharged from the passenger compartment through the ventilation opening.
[0005]
According to the means of claim 2, the open / close door can substantially close the air upstream side of the hot air outlet when the ventilation opening is opened. For this reason, when the ventilation opening is opened by the open / close door and the heating blower is operated, the indoor air can be prevented from being blown out from the warm air outlet into the vehicle interior, and can almost be discharged from the ventilation opening to the outside of the vehicle interior. Therefore, the vehicle interior can be efficiently ventilated.
[0006]
According to the third aspect of the present invention, the first supply port for supplying the outdoor air introduced by the defroster blower to the defroster outlet and the second supply for supplying the outdoor air introduced by the defroster blower to the connecting duct. A switching door for switching between the supply port and the supply port is provided. The defroster device that blows outside air with a lower absolute humidity from the defroster outlet to the windshield to prevent the windshield from fogging is mainly used in the winter and is mostly used in the summer to cool the passenger compartment. Absent. Therefore, in the summer when the defroster device is not used, the first supply port is closed by the switching door, so that all the outside air introduced from the outside air introduction port can be supplied to the cold air duct, so that a sufficient amount of air can be secured. On the other hand, in the winter season when the defroster device is used, all the outside air introduced from the outside air inlet can be supplied to the defroster outlet by closing the second supply port by the switching door, so that the same defroster effect as the conventional one is obtained. be able to. Of course, it goes without saying that the first supply port and the second supply port can be switched appropriately.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, the bus vehicle ventilation system of the present invention will be described with reference to the drawings.
FIG. 1 is a side sectional view of a bus vehicle.
The bus vehicle 1 includes a defroster device 2 that prevents the windshield from being fogged, a cooling device 3 that cools the passenger compartment, and a heating device 4 that heats the passenger compartment.
The defroster device 2 includes a defroster outlet (not shown) that blows out air toward the windshield, and a defroster blower 5 that introduces outside air and supplies the air to the defroster outlet.
[0008]
The cooling device 3 includes a cool air duct 6 for supplying cool air to the passenger compartment, a cooler 7 for cooling the air flowing in the cool air duct 6, and the outside air introduced by the defroster blower 5. The connecting duct 8 is supplied to The cold-air duct 6 has a plurality of cold-air outlets 6a, and is arranged with both shoulders of the vehicle interior ceiling extending in the front-rear direction of the vehicle. The cooler 7 is a refrigerant evaporator of a refrigeration cycle, and cools the air passing through the cooler 7 by heat exchange with a low-temperature refrigerant. One end of the connecting duct 8 is connected to an air passage (a passage through which the outside air introduced by the defroster blower 5 flows) leading to the defroster outlet, and the other end is connected to the front end of the cold air duct 6 (see FIG. 2). As shown in FIG. 3, the connecting duct 8 is formed in a rectangular cross section (vertical A: 80 mm, horizontal B: 60 mm), and is sized to allow a sufficient amount of outside air to flow.
[0009]
The heating device 4 includes a heater case 9 having a hot air outlet 9a (hot air duct of the present invention), a heater 10 accommodated in the heater case 9, and a heating fan for circulating indoor air in the heater case 9. 11 consists of. A plurality of the heating devices 4 are installed on both sides of the vehicle interior floor. The heater 10 is a hot water heater through which hot water (engine cooling water) flows, and heats the air passing through the heater 10 by heat exchange with the hot water. In addition, the hot water piping (not shown) which distribute | circulates warm water to the heater 10 is provided with the hot water valve (not shown) which adjusts a warm water flow rate.
[0010]
As shown in FIG. 4, the floor surface 12 on which the heating device 4 is installed is provided with a ventilation port 13 that allows the inside of the heater case 9 to communicate with the outside of the passenger compartment, and an open / close door 14 that opens and closes the ventilation port 13. It is attached. When the opening / closing door 14 is opened, the air upstream side from the warm air outlet 9a of the heater case 9 is substantially closed (the state shown in FIG. 4), and the air blown from the heating fan 11 is opened. The air is not blown out from the warm air outlet 9a into the passenger compartment, and most of the air is discharged from the vent 13 to the outside of the passenger compartment.
[0011]
Next, the operation of this embodiment will be described.
During the cooling operation, the outside air introduced by the operation of the defroster blower 5 is supplied to the cold wind duct 6 through the connection duct 8. The air flowing through the cold air duct 6 is cooled by the cooler 7 and blown out from the cold air outlets 6 a of the cold air duct 6 into the vehicle interior.
On the other hand, when the vehicle interior is ventilated, the heating blower 11 is operated with the ventilation opening 13 opened by the opening / closing door 14. However, the hot water valve is closed so that the hot water does not flow into the heater 10. As a result, the room air introduced into the heater case 9 by the heating blower 11 is exhausted from the ventilation port 13 to the outside of the passenger compartment.
Accordingly, the vehicle interior can be cooled in the outside air mode by operating both the defroster blower 5 and the heating blower 11 with the ventilation port 13 opened.
[0012]
(Effect of this embodiment)
In this embodiment, since the outside air introduced by the defroster blower 5 by the connecting duct 8 can be taken into the cold air duct 6, the vehicle side can be easily modified. In other words, since it is not necessary to provide an outside air introduction port in the ceiling portion of the bus vehicle 1 by using the outside air introduction port of the conventional defroster device 2, it is easy to ensure the vehicle body strength, and transfer of a frame or the like is also possible. It is unnecessary. In addition, there is no risk of rainwater, snow, etc. entering from the outside air inlet. Further, since the outside air can be introduced by the operation of the defroster blower 5 instead of the conventional method of introducing the outside air using the traveling ram pressure, a sufficient amount of outside air can be secured even when the vehicle is stopped.
[0013]
Moreover, since the ventilation surface 13 is provided in the floor surface 12 in which the heating apparatus 4 was installed, and the opening / closing door 14 which opens and closes this ventilation port 13 is provided, the ventilation port 13 is opened by the opening / closing door 14, and the air blower 11 for heating is provided. By operating the, the indoor air can be forcibly discharged from the ventilation port 13 to the outside of the passenger compartment.
Furthermore, since the open / close door 14 is in a state in which the air upstream side is substantially blocked from the warm air outlet 9a of the heater case 9 when the ventilation port 13 is opened, the air blown from the heating blower 11 is warm air outlet 9a. Therefore, most of the air is discharged from the ventilation port 13 to the outside of the passenger compartment, so that the passenger compartment can be efficiently ventilated.
[0014]
(Modification)
In the present embodiment, the structure is such that outside air is introduced into both the defroster outlet and the cold air duct 6 by the operation of the defroster blower 5, but it may be configured to be supplied to either one by a switching door (not shown). . That is, the defroster device 2 that blows outside air having an absolute humidity lower than the defroster outlet to the windshield to prevent the windshield from being fogged is mainly used in the winter, and almost in the summer when the vehicle interior is cooled. not being used. Therefore, in summer when the defroster device 2 is not used, the outside air supply port to the defroster outlet is closed by the switching door, so that all the outside air introduced from the outside air inlet can be supplied to the cold air duct 6, so that sufficient air Air volume can be secured. On the other hand, in the winter season when the defroster device 2 is used, all the outside air introduced from the outside air inlet can be supplied to the defroster outlet by closing the outside air inlet to the cold air duct 6 by the switching door. The defroster effect can be obtained. Of course, it goes without saying that the outside air supply port to the defroster outlet and the outside air supply port to the cool air duct 6 can be appropriately switched by the switching door.
[0015]
In the above embodiment, when the heating fan 11 is operated to forcibly ventilate the passenger compartment, the hot water valve is controlled so that the hot water does not flow through the heater 10. It is good also as a structure which always arrange | positions warm water to the heater 10 by arrange | positioning on the air downstream side from the vent 13 and preventing air from flowing into the heater 10 when the opening / closing door 14 opens the vent 13. . Therefore, in this case, the hot water valve can be eliminated.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a bus vehicle.
FIG. 2 is a cross-sectional view showing a connection state between a cold air duct and a connecting duct.
FIG. 3 is a sectional view of the connecting duct (a sectional view taken along the line CC in FIG. 1).
FIG. 4 is a cross-sectional view showing a configuration of exhaust means.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bus vehicle 5 Fan for defroster 6 Duct for cold air 6a Cold air outlet 8 Connection duct 9 Heater case (duct for hot air)
9a Hot air outlet 11 Blower 13 for heating 13 Ventilation opening 14 Opening and closing door

Claims (3)

A defroster outlet that blows out air toward the windshield of the vehicle,
A defroster blower that introduces outdoor air and supplies it to the defroster outlet;
A cold air duct having a cold air outlet and supplying cold air from the cold air outlet to the vehicle interior;
A cooler that is disposed in the cold air duct and cools the air flowing in the duct;
A connecting duct capable of supplying outdoor air introduced by the defroster blower to the cold air duct;
A hot air duct having a hot air outlet and supplying hot air from the hot air outlet to the passenger compartment;
A fan for heating that circulates indoor air in the duct for hot air;
A ventilation opening communicating the inside of the duct for hot air and the outside of the passenger compartment;
A ventilation system for bus vehicles provided with an opening / closing door for opening and closing the ventilation opening. 2. The ventilation system for a bus vehicle according to claim 1, wherein the open / close door substantially closes an air upstream side of the hot air outlet when the ventilation opening is opened. Switching between a first supply port for supplying outdoor air introduced by the defroster blower to the defroster outlet and a second supply port for supplying outdoor air introduced by the defroster blower to the connection duct is switched. The bus vehicle ventilation system according to claim 1 or 2, further comprising a switching door.

Images