JPS5915733Y2 - Vehicle window glass defogging device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a vehicle window glass defogging device for defogging a vehicle door glass.

Conventionally, in order to remove fog from the side door glass of an automobile, warm air from a heater unit is sent through a duct to a side demister nozzle to remove fog from the door glass.

However, in general, the side demister nozzle is far from the heater unit, and the duct connected to the side demister nozzle is formed with a complicated curve due to the structure of the car body, so the air volume and heat amount are weaker than other nozzles. It takes a long time to remove the fog, and the hot air that is distributed into the cabin is adjusted by adjusting the opening of the air mix door installed upstream of the heater core to separate the hot air that passes through the heater core and the air that does not pass through the heater core. If the air is mixed downstream of the heater core and is comfortable as relatively low-temperature warm air, or if the blower is used at a low rotation speed, it is necessary to have a weaker air volume and heat quantity to remove fog from the door glass. Become,
It takes time to defog the door glass.

Furthermore, since the heater unit is a hot water type, it cannot be used until the water temperature rises, and therefore there is a drawback that removal work cannot be performed immediately after starting the engine.

The present invention was made to solve the above-mentioned conventional problems, and barium titanate has a positive resistance temperature characteristic opposite to that of ordinary semiconductors, and its electrical resistance suddenly changes around the Curie temperature. By using a heating element (hereinafter referred to as an electronic heater) made of a (BaTtOa)-based oxide semiconductor and having multiple ventilation holes, the demister effect is enhanced by compensating for the lack of heat near the side demister nozzle. It is an object of the present invention to provide a defogging device for a vehicle window glass that can be used even when the water temperature is not high.

The present invention will be described below with reference to illustrative embodiments.

a is a fog removing device for removing fog from a door glass 2 of a side door 1 of an automobile, and includes a front demister nozzle 3;
It is composed of a communication part 4 communicating with the ducts 3 of a and 3b, a side demister nozzle 4a, and an electronic heater 7 and a lid 8 provided in the communication part 4.

The base end 3C of the duct 3 is fitted into an upper end opening 5 that is integrally formed upward at the tip of a heater unit b having a hot water type heater core 15, a blower 10, and an air mix door 16.

Further, the base end 4b of the communication portion 4 extending in the left-right direction of the vehicle is fitted into the tip 3d of the duct 3 located near the front demister nozzle 3b, and the front demister nozzle 3
A part of the warm air blown to a and 3b is directed to the side demister nozzle 4a.

The front demister nozzles 3a and 3b are opened in the upper surface 6a of the instrument panel 6 so that air can be blown toward the front windshield 26 to remove fogging from the front windshield 26.

The front demister nozzles 3a and 3b are shown in FIGS.
As in the embodiment shown in the figure, it may be formed integrally above the middle part of the duct 3, or it may be provided separately from the duct 3,
It may be communicated with the duct 3 through a connecting pipe or the like.

The side demister nozzle 4a is attached to be exposed on the side surface 6b of the instrument panel 6 so as to open toward the door glass 2, and its base end 4C is fitted into the tip 4d of the communication portion 4. There is.

The communication portion 4 is made of a barium titanate (BaTi03)-based oxide semiconductor, which has a positive resistance-temperature characteristic opposite to that of a normal semiconductor, and whose electrical resistance suddenly changes around the Curie temperature. An electronic heater 7 with ventilation holes is provided, and a lid 8 that can be opened and closed for controlling the amount of air distributed to the side demister nozzle 4a is provided upstream of the electronic heater 7.

The circuit of the switch 9 that energizes the electronic heater 7 is connected so that it can also simultaneously drive the motor 11 that operates the blower 10 of the heater unit b, and the ON-OFF state of the switch 9 is shown in FIG. 4, for example. The switch mechanism is similar to the switch mechanism that is provided on the front of the instrument panel 21 and turns on the switch 25 by pulling the lever 24 that opens and closes the lid 23 in the duct 22 toward the user when the lid 23 is in the open position. It is being said.

Note that a dedicated switch 12 is separately provided so that the motor 11 that operates the blower 10 can be driven independently.

13 is a link for opening and closing the lid, 14 is a relay, 17 is a foot nozzle, 18 is a front nozzle, and 19 is a damper.

To remove fog from the door glass 2 of the side door 1 using the defogging device a configured as described above, when the engine is started, that is, when the water temperature has not risen, the air mix door 16 should be placed on the side of the heater core 15. After the foot nozzle 17 of the heater unit b and the damper 19 of the front nozzle 18 of the instrument panel 6 are closed and the lid 8 is opened, the switch 9 is turned on to turn on the electronic heater 7. At the same time as electricity is supplied, the blower 10 in the heater unit b) is operated.

By this operation, air is sent from the blower 10, which causes the electronic heater 7 to generate heat, and warm air is blown from the side demister nozzle 4a, thereby making it possible to remove fog from the door glass 2.

When the water temperature rises and warm air starts to blow out from the heater core 15, the air mix door 16 is rotated and the heater core 1
Open the 5th side to send warm air to each nozzle.

At this time, if necessary, the damper 19 of the foot nozzle 17 may be opened to blow hot air from the iron part, or the front nozzle 1 may be opened.
The damper 19 on the 8th side can be positioned in the middle, and the hot air can be arbitrarily adjusted to be blown out separately into the front nozzle 18 and the side demister nozzle 4a.

When the water temperature rises and the hot air coming out of the heater unit b is sent to the electronic heater 7, and the temperature of this hot air exceeds the set temperature of the electronic heater 7, almost no current flows through the electronic heater 7, and the electronic The heater 7 no longer generates heat.

(This is due to the characteristic of the electronic heater that as the temperature around the electronic heater rises, the amount of heat generated decreases and no more power is consumed than necessary.

) Therefore, at this point, the switch 9 is turned off and the switch 12 dedicated to the blower 10 is turned on to operate in the same way as in the conventional case.

In this embodiment, the electronic heater 7 is provided inside the communication section 4, but it is not limited to the inside of the communication section 4, and may be placed inside the duct 3 as long as it is near the site stimulator nozzle 4a.

The side demister nozzle is located farther from the heater core than other nozzles, and is communicated through a duct that inevitably increases ventilation resistance, so the amount of air blown from the side demister nozzle is The amount of heat is less than other nozzles, but according to the present invention, an electronic heater is provided in the communication part that communicates the duct and the side demister nozzle, or in the duct, and the insufficient amount of heat is reheated and transferred from the side demister nozzle. Since the air is blown out, fogging on the side door glass can be efficiently removed.

In addition, the warm air distributed into the vehicle interior is adjusted by adjusting the opening degree of the air mix door installed upstream of the heater core, and the warm air passing through the heater core and the air not passing through the heater core are mixed downstream of the heater core. If the hot air is comfortable at a low temperature, or if the blower is used at a low rotation speed, the amount of hot air blown out from the side mister nozzle will further decrease, but according to the present invention, the electronic Since reheating can be performed using a heater, this drawback is compensated for, and since there is no need to increase the temperature of the hot air distributed into the passenger compartment, the comfort of the room temperature is not sacrificed.

Furthermore, according to the present invention, the amount of air blown to the front demister nozzle and the side demister nozzle can be adjusted using the lid provided upstream of the electronic heater, so that the limited amount of air can be selectively distributed to where it is needed. At the same time, the reduced air distribution to the side demister nozzle can be assisted by reheating, so the amount of air blown from the front demister nozzle can be increased to the site demister nozzle without sacrificing the defogging performance of the windshield. It has become easier to maintain the performance of the nozzle.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a heater unit incorporating a side demister device according to the present invention, Fig. 2 is a front sectional view of the same, Fig. 3 is a switch circuit diagram, and Fig. 4 is a side view showing an example of a switch structure. It is a diagram. a is a defogging device, b is a heater unit, 3 is a duct,
4 is a communication part, 4a is a side demister nozzle, 7 is an electronic heater, 8 is a lid, 9 is a switch, and 10 is a blower.

Claims (1)

[Scope of utility model registration request] A front mister nozzle is connected by a duct to a heater unit having a hot water type heater core, a blower, and an air mix door, and is opened on the top surface of the instrument panel to blow air toward the front windshield to remove fogging from the front windshield. A part of the warm air blown to the front chimister nozzle is distributed toward the door glass of the side door, and a side opening toward the door glass is provided to remove fogging from the door glass. A vehicle window glass defogging device having a demister nozzle includes a communication portion extending in the left-right direction of the vehicle from near the front demister nozzle and communicating the duct of the front demister nozzle with the side demister nozzle;
A lid for controlling the amount of air distributed to the side demister nozzle is provided in the communication portion or duct, and a plurality of ventilation holes are bored between the lid and the side demister nozzle to provide a positive resistance temperature characteristic. A heating element made of a barium titanate-based semiconductor is provided, and a heating element energization circuit having a switch for making the heating element conduct air or non-air ventilation is provided, and a lever for adjusting the opening degree of the lid is provided. What is claimed is: 1. A defogging device for vehicle window glass, characterized in that: