JPH09188127A - Outside air taking-in structure for vehicle heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To warm a car interior considerably quickly by placing an air-blowing- back preventing plate at a position for allowing air stream to flow opposite when an engine is started at extremely low temperatures of outside air or in the car room. SOLUTION: When an engine is started at extremely low temperatures of outside air, an operation lever 33 is lowered to place an air-blowing-back preventing plate 31 at a position for allowing the air stream to flow opposite. The engine 13 is started in this state and a heater 21 is driven. When a cooling fan 14 is operated by the start of the engine 13, air stream flowing from the front to the rear of a radiator is generated. A part of the hot air stream passing the radiator 12 turns around and returns to the front of the radiator 12 via the open air-blowing-back preventing plate 31. A part of the air stream returning to the front of the radiator 12 enters the air intake 21a of the heater 21. The warmed air is additionally warmed by the heater 21 and discharged from a blowing-out port to warm the car interior.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle heater such as a cab-over truck having a radiator provided below a cab floor panel. More specifically,
The present invention relates to a vehicle heater external air intake structure in which a blowback prevention plate is attached to the radiator and an external air intake port of the heater is provided in the vicinity of the radiator.

[0002]

2. Description of the Related Art Conventionally, an engine of a cab-over truck is housed in an engine room provided below a floor panel of the cab, and the engine room is covered with a cover in order to reduce noise of the engine. Further, the radiator arranged in front of the engine is cooled by a cooling fan driven by the engine and provided between the engine and the radiator. When the cooling fan is operated, an air flow that escapes from the front surface to the rear surface of the radiator is generated to cool the cooling water flowing inside the radiator. The radiator is provided with a blowback preventive plate protruding toward the periphery thereof.
The hot air that has once passed through the radiator blocks the attempt to return to the front surface of the radiator from the vicinity of the periphery of the radiator, so that the cooling performance of the radiator is not deteriorated.

On the other hand, this type of vehicle is equipped with an air conditioner in which a cooler unit, a heater and the like are built in in order to make the interior space of the passenger compartment comfortable. This air conditioner is provided in front of the cab, sucks the outside air or the air in the passenger compartment from the intake port, and adjusts the temperature condition to the optimum by the air conditioner. Usually, the outside air intake port of the heater is provided in the front of the vehicle in the vicinity of the radiator, and the heater is provided with a large number of tubes provided at predetermined intervals and through which a large number of fins are provided between the tubes, through which engine cooling water flows. The air sucked from the outside air intake port is heated by passing between the tubes and the fins. The air warmed by the heater is guided by the guide tube and is blown out at the blowout port. With such a heater, an occupant can operate in a comfortable temperature environment while traveling even in a relatively cold season.

[0004]

However, in the above vehicle, there is a problem that the interior of the vehicle cannot be sufficiently warmed even if the heater is driven when the outside air temperature is considerably low, such as in winter in a cold region. In this case, the problem can be solved by sucking the air in the passenger compartment and reheating it with a heater, but the passenger compartment cannot be warmed early because the passenger compartment is as cold as the outside air at the beginning of engine startup. There is. An object of the present invention is to provide an outside air intake structure for a vehicle heater that can warm the inside of the vehicle relatively early when the outside air temperature or the temperature inside the vehicle interior is extremely low.

[0005]

The invention according to claim 1 is
As shown in FIG. 1, the outside air of a vehicle heater having an outside air intake port 21a in the vicinity of the radiator 12 of a vehicle in which a blowback prevention plate 31 for preventing backflow of the air flow passing through the radiator 12 is attached to the periphery of the radiator 12. This is an improvement of the intake structure. The characteristic structure is that the blowback prevention plate 3 is provided.
1 is provided so as to be able to fall down so as to allow the backflow of the air flow, and the blowback prevention plate 31 prevents the backflow of the air amount.
It is provided with driving means 32, 33 for switching between the position and the second position which allows the backflow of the air flow.

In the outside air intake structure of this vehicle heater,
During the traveling without using the heater, the blowback prevention plate 31 is set to the first position by the driving means 32 and 33 to prevent the backflow of the airflow and prevent the cooling performance of the radiator from being deteriorated. Even when a heater is used, fresh air outside the vehicle is warmed by adjusting the intake temperature through the air intake port 21a. When the engine is started when the outside air temperature or the temperature inside the vehicle compartment is extremely low, the blowback prevention plate 31 is positioned at the second position by the driving means 32 and 33 to allow the backflow of the airflow. Part of the hot air that has passed through the radiator 12 makes a U-turn and returns to the front surface of the radiator 12 from the blowback prevention plate 31 that is opened. A part of the air flow returning to the front surface of the radiator 12 enters the air intake port 21a in a warmed state.

According to a second aspect of the present invention, in the invention according to the first aspect, the drive means includes a lever 33 provided on the operation panel of the heater, and a wire cable 32 connecting the lever 33 and the blowback prevention plate 31. It is a structure for taking in the outside air of the configured vehicle heater. With this structure for taking in the outside air of the vehicle heater, the driver can arbitrarily operate the blowback prevention plate, and can operate it according to the driving environment of the vehicle such as the season and the outside air temperature.

According to a third aspect of the present invention, in the first aspect of the present invention, a temperature sensor 41 is provided in the passenger compartment, an actuator 42 is connected to the blowback prevention plate 31 via a wire cable 43, and the driving means is operated at a temperature. This is an outside air intake structure for a vehicle heater configured to drive an actuator 42 based on a detection output of a sensor 41. In this structure for taking in the outside air of the heater for a vehicle, the temperature sensor 41 operates the blowback prevention plate 31 via the actuator 42 according to the temperature state in the vehicle interior, so that the driver manually operates the blowback prevention plate 31. Can be avoided.

[0009]

Next, a first embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, a floor panel 11 of a cab 11 of a cab-over type truck
There is a radiator 1 in the engine room below a.
2 and the engine 13 are housed. The radiator 12 is arranged in front of the front surface of the engine 13 with a predetermined gap, and a cooling fan 14 driven by the engine 13 is rotatably mounted on the front surface of the engine 13. Further, the fan 14 is a rear surface of the radiator 12. Is covered by a fan shroud 16 attached to the. Radiator 1
2 has a radiator core 12a, and a lower tank 12b and an upper tank 12c arranged on the lower surface and the upper surface of the core 12a.

On the other hand, in front of the cab 11, a front panel 11d forming the front surface of the cab 11 is provided. Although not shown, the front panel 11d is pivotally attached at its upper end by a hinge provided at the bottom of the windshield glass. A dash panel 11b is provided behind the front panel 11d with a space provided therebetween.
An accessory chamber is formed by d and the dash panel 11b. Although not shown, the auxiliary equipment accommodating chamber is provided with an outside air intake port 21a for a wiper motor and a heater for heating in addition to devices such as a window washer tank, an engine oil supply port, and an engine reservoir tank, and the outside air intake port 21a has a filter 21b. (Fig. 2) is installed.

A heater 21 for heating the interior of the vehicle is provided on the rear surface of the dash panel 11b. As shown in FIG.
The heater 21 is provided inside the air conditioner 22, and the air conditioner 22 further includes a cooler unit 23, a blower 24, and the like. The inlet 23a of the cooler unit 23 communicates with the outlet 24a of the blower 24 that sends air outside or inside the vehicle to the cooler unit 23 or the heater 21.
The outlet port 23b of No. 3 communicates with the two flow paths 26a and 26b. The heater 21 is provided with a heater core 21c,
The heater core 21c has a large number of tubes (not shown) that are provided at predetermined intervals and through which cooling water for the engine flows, and a large number of fins provided between the tubes, and air flows between the tubes and the fins. It is designed to be warmed by passing through. The inlet of the heater 21 communicates with one flow passage 26a, and the outlet of the heater 21 merges with the other flow passage 26b. Here, the guide pipe outlet 26c is provided.
Is formed. The guide pipe 27 is connected to the outlet 26c.
The air conditioned by the heater 21 and the cooler unit 23 is connected via a guide pipe 27 to each outlet (not shown) provided in the vehicle.

Returning to FIG. 1, the radiator 12 is provided with a blowback preventing plate 31 for preventing the backflow of the air flow passing through the radiator. The blowback preventive plate 31 is provided so as to be able to fall down via a hinge 31a provided at a lower portion of the floor panel 11a, and falls down as shown by a broken line from the first position for preventing backflow of the air amount to allow backflow of the airflow. To be configured. A wire cable 32 for opening and closing is connected to the blowback prevention plate, and the other end thereof is connected to an operation lever 33 provided on the instrument panel 15. The operation lever 33 is configured so that the blowback prevention plate 31 can be tilted from the driver's seat side. Reference numeral 34 is an air volume adjusting lever.

The operation of the outside air intake structure of the vehicle air conditioner thus configured will be described. When using the heater 21 during traveling, the operation lever 33 provided on the instrument panel 15 is positioned above and the blowback prevention plate 3 is provided.
1 is set to the first position for preventing backflow of the air flow, and the outside air or the air in the vehicle compartment is taken in by the occupant as desired and the heater core 21
After adjusting the temperature by c, the air is blown into the vehicle to warm it. Further, when the engine is started when the outside air temperature is extremely low, the operation lever 33 provided on the instrument panel 15 is positioned below to bring the blowback prevention plate 31 to the second position that allows the backflow of the airflow. In this state, the engine 13 is started and the heater 21 is driven. When the cooling fan 14 is activated by the start of the engine 13, an air flow that escapes from the front surface to the back surface of the radiator 12 is generated, and a part of the hot air after passing through the radiator 12 in this air flow is as shown by the solid line arrow in FIG. Then, from the blowback prevention plate 31 opened by U-turn to the radiator 1
Return to the front of 2. Part of the air flow returning to the front surface of the radiator 12 enters the air intake port 21 a of the heater 21. This air has already been warmed by passing through the radiator 12 in advance, so it is already warm, and this already warm air is further efficiently warmed by the heater and then discharged from a blow-out port (not shown) to warm the interior of the vehicle efficiently.

FIG. 3 shows a second embodiment of the present invention.
3, the same reference numerals as those in FIG. 1 indicate the same parts. The structure for taking in the outside air of the vehicle heater is such that a temperature sensor 4 serving as a driving unit is provided below the instrument panel 15 inside the vehicle.
1 and an actuator 42 are provided, and the actuator 42 and the blowback prevention plate 31 are connected via a wire cable 43. The detection output of the temperature sensor 41 is input to the actuator 42, and based on the detection output of the temperature sensor 41 equal to or higher than a predetermined temperature, the actuator 42 causes the blowback prevention plate 31 to prevent the backflow of the air amount via the wire cable 43. To a second position that allows backflow of the airflow. Except for the above, the structure is similar to that of the vehicle heater outside air intake structure of the first embodiment. In the vehicle air outside air intake structure thus configured, the blowback prevention plate 31 is driven by the actuator 42 via the wire cable 43. The actuator 42 of the vehicle heater of the first embodiment except that the blowback prevention plate 31 is controlled to switch from the first position to the second position by the detection output of the temperature sensor 41 that is equal to or higher than a predetermined temperature in the vehicle interior. Since the structure is the same as the outside air intake structure, repeated description will be omitted.

[0015]

As described above, according to the present invention, the blowback prevention plate is provided so as to be able to fall down so as to allow the backflow of the air flow, and the blowback prevention plate is at the first position for preventing the backflow of the air amount. And a drive means for switching to a second position that allows backflow of the air flow, the blowback prevention plate is driven by the drive means when the engine is started when the outside air temperature is extremely low.
If it is located at the position, part of the hot air after passing through the radiator makes a U-turn and returns to the front of the radiator from the blowback prevention plate that is opened, and part of this airflow enters the air intake port, so the heater is The efficiency of warming the air having a low temperature from the beginning is improved, and the passenger compartment can be efficiently warmed. Further, if the drive means is composed of a lever provided on the operation panel of the heater and a wire cable connecting the lever and the blowback prevention plate, the driver can arbitrarily operate the blowback prevention plate, It is possible to control the efficiency of heating the heater according to the driving environment of the vehicle such as the season and the outside air temperature.

Further, if a temperature sensor is provided in the passenger compartment, an actuator is connected to the blowback preventing plate via a wire cable, and the driving means is configured to drive the actuator based on the detection output of the temperature sensor, the passenger compartment Since the temperature sensor operates the blowback prevention plate via the actuator according to the temperature state of 1, the complexity of the driver manually operating the blowback prevention plate can be avoided. still,
It is only when the outside air temperature is relatively low that the blowback prevention plate is brought to the second position in the laid state by the driving means. Therefore, since the blowback prevention plate is at the second position, the cooling efficiency of the radiator is improved. It does not decrease.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an outside air intake structure of a vehicle heater according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of the heater.

FIG. 3 is a diagram corresponding to FIG. 1 showing a second embodiment of the present invention.

[Explanation of symbols]

 12 radiator 21a outside air intake 31 blowback prevention plate 32, 43 wire cable (driving means) 33 lever (driving means) 41 temperature sensor (driving means) 42 actuator (driving means)

Claims (3)

[Claims] 1. The radiator is provided around a radiator (12).
A blowback prevention plate that prevents the backflow of the air flow that has passed through (12)
In the outside air intake structure of a vehicle heater having an outside air intake port (21a) near the radiator (12) of the vehicle to which (31) is attached, the blowback prevention plate (31) allows the backflow of the airflow. Drive means (32, 33, 41) provided so as to be able to fall over and switching the blowback prevention plate (31) between a first position for preventing backflow of the air amount and a second position for allowing backflow of the airflow. , 42, 43) are provided for the outside air intake structure of a heater for a vehicle. 2. A lever (33) provided with a driving means on an operation panel of the heater, the lever (33) and a blowback prevention plate (3).
The outside air intake structure for a vehicle heater according to claim 1, which is constituted by a wire cable (32) connecting the (1) and the wire cable (32). 3. A temperature sensor (41) is provided inside the vehicle compartment, an actuator (42) is connected to the blowback prevention plate (31) via a wire cable (43), and the drive means is the temperature sensor (41). The outside air intake structure for a vehicle heater according to claim 1, wherein the actuator (42) is driven based on a detection output.