JPS5836575Y2 - Automotive heating system - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heating device for an automobile, particularly one that supplies warm air to the feet of rear seats.

In general, the majority of automotive heating systems are hot water types that use engine cooling water as the heating heat source, and this heating system is economical as well as the heat source can be easily obtained.

That is, this hot water type heating system guides the cooling water of the water-cooled engine to the heater core in the heater unit, blows air from inside and outside the vehicle interior to this heater core using a blower, heats it, and uses various ducts to heat the heated air. It blows out at the feet of the front and rear seats for heating, or onto the windshield for defrosting.

However, the heating or defrosting capacity of this hot water heating system is basically determined by the temperature and circulation amount of the coolant led to the heater core, and since the temperature of the coolant is low when the engine starts, the heating capacity and defrosting capacity are is low.

In addition, in order to save on heat costs, some modern engines are energy-saving engines that reduce the amount of heat lost from the cooling water. In particular, when using such an automobile heating system to heat the left and right footwells of the front seats and the footwells of the rear seats, the warm air blown from the heater core is diverted to the front seats by a blow-off duct.
The air blows out to the left and right footwells of the front seats, providing a sufficient feeling of heating, but for the rear seats, warm air has to blow between the front seats and the general floor to warm the rear footwells. The temperature of the warm air at the feet of the rear seats is lower than that of the feet of the left and right seats.

For this reason, a rear duct is connected to the above-mentioned blow-off duct, and warm air is blown out from the blow-off duct to the front seats, and warm air is sent to the rear seats through the rear duct, but in reality, the rear seats still There is a problem that the temperature of the blown air becomes lower.

This invention eliminates the above-mentioned defects and reheats the warm air using a positive temperature coefficient thermistor installed in the rear duct so that the desired warm air is blown out to both the front and rear seats of the vehicle. An object of the present invention is to provide a heating device for a vehicle that supplies warm air with an optimal temperature.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of essential parts of an embodiment of a heating device for an automobile according to the present invention. This device 1 includes a heater unit 2 having a heater core (not shown) through which engine cooling water is guided; It has a blow-off duct 3 attached to the heater unit 2 and a rear duct 5 connected to a rear-seat blow-off port 4 of the blow-off duct 3.

This heater unit 2 belongs to the well-known art and heats outside air or inside air drawn in by a fan (not shown) using a heater core.

The above-mentioned blow-off duct 3 is attached to the lower part of this heater unit 2, and this blow-off duct 3 has front seat blow-off ports 6 opened on both left and right sides to blow out warm air to the feet of the front seats, and the rear duct. 5 forms a rear seat air outlet 4 which is connected to the rear seat air outlet 4, and the warm air flowing down from the heater unit 2 is distributed here.

This rear duct 5 is branched to the left and right in the downstream region of the entrance part, and each branch duct 7.7 extends between the front seat 8 and the general floor surface 9 as shown in FIG. It is open to the public.

In particular, in the present invention, the air outlet 5a of the rear duct 5,
Positive temperature coefficient thermistors 11 and 11 are respectively provided near 5a, and the warm air flowing down is reheated here.

This positive temperature coefficient thermistor IL11 is made by adding a very small amount of additives to barium titanate, which is known as a ferroelectric material.The so-called harmonica heater is made by forming this into a harmonica shape and increasing heat dissipation efficiency. It is 12.

This harmonica heater 12, as shown in FIGS. 3 and 4,
Square plate positive temperature coefficient thermistor elements 13, 13, . , 13b are covered with terminal plates 14, 15, and an insulating spacer 16.1 is placed between both ends of these terminal plates.
6 is being held.

The terminal plate 14.15 has an opening 17.18 in the longitudinal direction.
are formed, and when air passes through these openings 17 and 1B, it comes into contact with the surface of the element that has been heated by electricity and is heated.

Said element 13 is glued at its corners to the terminal plates 14.15 with a structural adhesive 19, and the central members 14a, 15a defining the openings 17, 18 of the terminal plates 14.15 are glued with a conductive adhesive 20.20. Element electrode 13 a t 13 b
is glued to.

Further, screw holes 14bt 1 are provided at both ends of the terminal plate 14.
sb is formed, and this screw hole 14b is for mounting and fixing the product and for attaching lead wires 21, 21 (FIG. 1).

Furthermore, since the entire harmonica heater 12 is coated with silicone paint, it has excellent insulation and moisture resistance, and is less likely to attract dust.

In this way, by combining positive temperature coefficient thermistor elements at predetermined intervals, heating them by energizing them, and then blowing air directly between them, efficient heat dissipation can be achieved and the temperature of the air can quickly rise. It is possible to obtain a large output of several hundred watts, which was not possible with conventional methods.

In addition, the amount of heat generated can be controlled by the air flow rate, and the air flow area can be made relatively large, resulting in low pressure loss, no clogging, easy removal of lead wires, and self-temperature control, eliminating the need for bimetals, etc. There is no need to worry about overheating and there is no need for a temperature fuse.

Note that the shape and dimensions of the thermistor element can be arbitrarily determined according to the heat generation characteristics, and the number of the thermistor elements to be assembled can be arbitrarily selected according to the required heat generation amount.

If the harmonica heater 12 having such characteristics is installed on the outlet side of the rear duct 5, the amount of heat generated can be reduced even when the coolant temperature is low when starting the engine, or when the coolant heat of a car used in a cold region is insufficient. The heating capacity of the heater unit can be supplemented by an appropriately selected harmonica heater, and the footwells of the rear seats can be heated immediately.

Moreover, by providing this harmonica heater 12, there is no risk of the heating device becoming larger.

In particular, this positive temperature coefficient thermistor is small, lightweight, and easy to install as described above, and has superior handling and controllability compared to other auxiliary preheating devices, and its effect on heating is enormous.

In the above-mentioned embodiment, the positive temperature coefficient thermistor is provided at the air outlet of the rear duct, but it may also be provided at the base side position indicated by the symbol A in FIG. 1, or at both the air outlet and the base position. good.

As is clear from the above explanation, according to the present invention, a positive temperature coefficient thermistor is installed near the air outlet in the rear duct, so that high-temperature warm air is supplied to the feet of the rear seats in the same way as the warm air blown out to the front seats. It is possible to compensate for the heat loss caused by the rear duct, and even when the engine coolant temperature is low, the temperature at the feet of the rear seats (in luxury cars, important people usually sit in the rear seats) can be adjusted to the optimal temperature. It has the excellent effect of supplying controlled warm air.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main parts of an embodiment of the automotive heating device according to the present invention, FIG. 2 is a schematic cross-sectional view showing the heating device installed in the vehicle, and FIG. 3 is a perspective view of a harmonica heater. FIG. 4 is a cutaway perspective view showing the internal structure of the harmonica heater. 1...Heating device for medium-sized vehicles, 2...Heater unit, 3...Blowout duct, 4...
Rear seat air outlet, 5... Rear duct, 11...
...Positive characteristic thermistor.

Claims (1)

[Scope of utility model registration request] In an automotive heating system that blows out heated air to the feet of the front seats from a blow-off duct attached to the heater unit, a rear duct is connected to the blow-off duct to guide heated air to the feet of the rear seats. A heating device for an automobile that has a positive temperature coefficient thermistor installed near the air outlet.