JPH0326972Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Field of Application] The present invention relates to an air conditioner for an automobile, and particularly to control of air volume for a defroster. [Prior Art] In general, air conditioners for automobiles introduce warm or cold air into the vehicle interior to make the interior of the vehicle comfortable, or blow warm air onto the windshield to prevent the window from fogging up. The purpose of this is to ensure a clear field of view, and therefore, conventional automobile air conditioners have adopted a structure that provides a ventilation mode that meets the above purpose. For example, in the differential mode to prevent the windshield from fogging up, a large amount of warm air is blown from the defroster outlet toward the windshield, and in the heat mode to warm the interior of the vehicle, a large amount of warm air is blown toward the inside of the vehicle. The air is blown out from the exit onto the passengers' feet. By the way, even in the above-mentioned heat mode, in order to prevent the windshield from fogging up, there are some systems in which warm air is blown not only from the passenger's feet but also from the differential air outlet. When blowing hot air from
If the differential air volume is too large, the occupant will experience a feeling of heat in the head, that is, the head will feel unnecessarily hot, which is undesirable. Therefore, in order to limit the amount of defroster air in the heat mode, conventional defroster ventilation ducts that guide air blown from the heater unit to the differential air outlet have been fixed with a resistance plate for applying air blowing resistance. However, in this conventional device, the above-mentioned resistance plate naturally acts as air blowing resistance even in the differential mode, and as a result, there was a problem in that the differential air volume in the differential mode was reduced and the anti-fogging function of the window was inhibited. . Furthermore, as a structure for suppressing the air volume of the defroster during heat mode without interfering with the defroster function, there is a structure described in Japanese Utility Model Application Publication No. 1987-75010, which has a structure in which the air pressure inside the defroster passage is It had a hanging flap that opened and closed. However, in the device described in this publication, the defroster passage opens when the flap swings, but when the flap is closed, the flap swings even with a small wind pressure, so in this conventional example, even a small wind pressure However, the air volume increases, and the effect of suppressing the differential air volume in heat mode is insufficient.Furthermore, the flap is in a horizontal state even when fully open, and its own weight acts most heavily in the closing direction. As a result, the air volume in the differential mode is reduced, and as a result, the conventional device described in this publication was insufficient in its differential function. [Purpose of the invention] The present invention was developed in light of the conventional situation, and it is possible to effectively limit the differential air volume in the heat mode to suppress the feeling of a hot head, and reduce the air blow resistance in the differential mode. The purpose is to provide an automotive air conditioner that can improve the differential function. [Structure of the invention] The present invention is an automotive air conditioner in which a defroster ventilation duct is formed with an upwardly bent bent part, and a baffle plate is attached to the duct wall on the inner side of this bent part to shorten the ventilation duct under its own weight. It is installed so that it can swing freely between the closed position and the almost vertically upward open position that is opened by wind pressure, and a differential flap is installed in the upstream passage.
Furthermore, a heater flap is attached to the ventilation duct on the inside of the vehicle interior so that it can be opened and closed, and in the differential mode in which the heater flap is closed when the flap is opened, the baffle plate is moved to the open position by the pressure of air blown only to the defroster ventilation duct, and the differential flap and heater flap are closed. In the heater mode in which both are open, the baffle plate is positioned between the open position and the closed position due to the pressure of part of the air blown into the defroster ventilation duct. As a result, in the present invention, in the heat mode, the baffle plate's own weight acts in the closing direction, so the defroster ventilation duct does not open wide even with small wind pressure, and in the heat mode, the baffle plate acts in the closing direction. Rotates almost vertically upward,
Since its own weight does not act much in the closing direction, it does not cause ventilation resistance. [Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1 to 3 are for explaining an automobile air conditioner according to an embodiment of the present invention. In the figures, 1 is an air introduction duct, and an outside air introduction port 1a is provided at the upstream end of this duct. Further, an inside air inlet 1b is formed slightly downstream thereof, and both of these inlets 1a, 1b can be switched open and closed by an inside air flap 2a. A blower fan 3 is disposed slightly downstream of this inside air inlet 1b. A unit casing 4a of a heater unit 4 is connected to the downstream end of the air introduction duct 1, and a heater core 5 is disposed within the unit casing 4a. A ventilation outlet 4b for introducing outside air into the vehicle interior is formed, and a core flap 2b connects to an air inlet 5a of the heater core 5 on the upstream side of the heater core 5.
and a passage to the ventilation outlet 4b can be selectively opened and closed. Further, in the vicinity of the ventilation outlet 4b of the unit casing 4a, there is a bench flap 2 for opening and closing the outlet 4b.
c is swingably attached, and the passage from the air introduction duct 1 to the air outlet 4b is opened and closed by the core flap 2b, as described above. The heater opening 4c formed in the unit casing 4a of the heater unit 4 is connected to a heater passage 8, which is a ventilation duct inside the vehicle interior for guiding air from the unit 4 to the feet of the occupants in the vehicle interior. A heater flap 2e that opens and closes the heater opening 4c is disposed at the heater opening 4c. Room air outlets 8a and 8b are formed at the end of the heater passage 8 on the vehicle interior side. Further, a differential passage 9, which is a defroster ventilation duct for guiding air from the heater unit 4 to the window glass portion, is connected to the differential opening 4d formed in the unit casing 4a. The above differential passage 9 is included in the section.
A differential flap 2d for opening and closing the heater passage 8 is also provided. The differential passage 9 has a roughly oval shape in cross section, and a bent part 9a bent vertically upward is formed near the connection part, and the bottom wall 9e of this bent part 9a is in the shape of an arc. ing. Further, a side differential air outlet 9b is formed slightly above the bent portion 9a of the differential passage 9, and a differential air outlet 10 is connected to the upper portion of the side differential air outlet 9b via a flexible joint 11 made of rubber or the like.
The differential air outlet 10a is formed in the differential air outlet 10 to have a width substantially equal to the width of the window glass. And the top wall 9c of the bent portion 9a of the differential passage 9
A baffle plate 12 is pivotally supported by a support pin 13 in a freely swingable manner. As shown in FIG. 2, the baffle plate 12 is a tongue-shaped plate made of rubber, for example, and the space between its upper edge 12a and the top wall 9c of the differential passage 9 forms an arch-shaped air passage. Also, the side edge 12b and lower edge 12c of this baffle plate 12, and the differential passage 9
The air surrounded by the side wall 9d and the bottom wall 9e forms a U-shaped air passage. Here, as the thickness of the baffle plate 12 increases, it becomes heavier and becomes more difficult to swing, but this plate thickness is determined by the desired degree of suppression of the differential air volume in the heat mode and the required differential pressure in the differential mode, which will be described later. It is selected appropriately depending on the air volume. Next, the effects will be explained. In the device of this embodiment, various ventilation modes can be selected depending on the purpose, but in order to clarify the function and effect of the baffle plate 12, which is a feature of the device of this embodiment, the heat mode and the differential mode will be explained. The heat mode blows a large amount of warm air from the room air outlets 8a, 8 to the feet of the occupants inside the vehicle.
Furthermore, this is a blowing mode in which a small amount of warm air is blown into the window from the differential air outlet 10a, 9a.
b. The inside air inlet 1b, the air inlet 5a of the heater core 5, the differential opening 4d, and the heater opening 4c are opened by the differential flap 2d and the heater flap 2e, respectively, and the ventilation outlet 4 is opened by the vent flap 2c.
Close b. The reason why the inside air inlet 1b is opened here is to circulate relatively high-temperature air within the vehicle interior, thereby blowing out higher-temperature air into the vehicle interior without excessively increasing the heat load on the heater core 5, thereby producing a heating effect. This is to raise the level. When each of the flaps 2a to 2e is moved to the above-mentioned predetermined opening and closing positions in this way, the inside air flows from the inside air inlet 1b to the air introduction duct 1.
The air is heated in the heater core 5, guided mainly through the heater opening 4c to the heater passage 8, and blown into the vehicle interior through the room air outlets 8a and 8b. In this case, the air pressure inside the heater unit 4 also acts on the baffle plate 12 through the differential opening 4d, but as described above, this air pressure is applied to the heater opening 4c.
It's not very expensive since it's open. Therefore, due to this low air pressure, the baffle plate 12 is moved to the bent portion 9a of the differential passage 9 as shown by the dashed line in FIG.
However, the gap between the baffle plate 12 and the differential passage 9 is almost the same as when the baffle plate 12 is in the closed position shown by the solid line in FIG. Only the wind is introduced into the side differential air outlet 9b and the differential air outlet 10a through the differential passage 9, and is blown out toward the door glass and the window glass. Further, the above-mentioned differential mode is a blowing mode in which a large amount of warm air is blown out from the differential air outlet 10a and the side differential air outlet 9b to prevent fogging of the windows. As shown by the dashed line in FIG. 3, the outside air inlet 1a is opened by the inside air flap 2a and the heater flap 2e, and the heater opening 4c is opened.
Close. The reason why the outside air inlet 1a is opened here is to improve the anti-fogging effect by introducing dry air from outside the vehicle. When each of the flaps 2a to 2e is moved to a predetermined opening/closing position in this way, outside air is transferred from the outside air inlet 1a to the air introduction duct 1.
This air is heated by the heater core 5 and introduced into the differential passage 9 from the differential opening 4d. In this case, the air pressure inside the heater unit 4 is higher than in the heat mode because the heater opening 4c is closed as described above, and this high air pressure acts on the baffle plate 12. . Then, the baffle plate 12 swings to the substantially vertically upward position shown by the two-dot chain line in FIG. It hardly acts as resistance, and as a result, a large amount of hot air passes through this differential passage 9 and reaches the differential air outlet 10.
a. It is blown out from the side differential air outlet 9b. Note that the internal air flap 2a and the core flap 2
b, the differential flap 2d, and the heater flap 2e are controlled by arbitrarily operating a well-known mode switching mechanism at the request of the occupant;
Since its specific structure is not directly related to the present invention, illustration and explanation thereof will be omitted. In this embodiment, the bent portion 9a bent vertically upward is formed in the differential passage 9, and the baffle plate 12 is attached thereto so as to be swingable between the vertically downward closed position and the vertically upward open position. Therefore, in the heat mode, even if this baffle plate 12 swings a little, the gap between it and the differential passageway 9 hardly changes, so the differential air volume does not increase in the heat mode, and the passenger The feeling of heat in the head can be suppressed, and in the differential mode, the baffle plate 12 is swung vertically downward, so that its own weight hardly acts as a resistance to the differential airflow, and a sufficient amount of differential airflow can be ensured. Next, a comparative test for confirming the effects of the above examples will be explained. FIG. 4 is for explaining this comparative test, and 21 is a resistance plate fixed to the entrance of the differential passage 9, which has a size that blocks approximately 1/2 of the cross-sectional area of this passage 9. The first comparative example is one in which only this resistance plate 21 is provided. Reference numeral 22 denotes a baffle plate that is swingably installed vertically at the connection between the unit casing 4a and the differential passage 9. This baffle plate has the same shape as the baffle plate 12 of the above embodiment; The second comparative example includes the following. This comparative test is based on the wind speed (m/s) in the differential passage 9.
The changes in heat mode and differential mode are compared when the voltage applied to the blower fan 3 is 6, 8, and 12V, and Table 1 shows the measurement results.

[Effect of idea]

As described above, according to the automotive air conditioner according to the present invention, the defroster ventilation duct is bent upward to form a bent part, and the bent part has a closed position where the ventilation duct is substantially closed by its own weight, and a wind pressure. Since a baffle plate is installed that swings between the open position and the almost vertically upward open position, in heat mode it is effective to suppress the differential air volume and reduce the feeling of heat in the passenger's head. The vehicle's own weight does not act as a resistance to the differential airflow, which has the effect of ensuring sufficient differential airflow.

[Brief explanation of the drawing]

Figures 1 to 3 are for explaining an automotive air conditioner according to an embodiment of the present invention.
The figure is a cross-sectional view of the defroster ventilation duct, FIG. 2 is a cross-sectional view taken along the line -- in FIG. FIG. 5 is a sectional view showing a modification of the baffle plate portion of the above embodiment. 4... Heater unit, 8... Heater passage (ventilation duct on the inside of the vehicle interior), 8a, 8b... Room air outlet (air outlet on the inside of the vehicle interior), 9... Defroster passage (defroster ventilation duct), 9a... Bend Part, 10a...
Differential air outlet, 12... baffle plate.

Claims (1)

[Scope of Claim for Utility Model Registration] A defroster ventilation duct that guides air blown from a heater unit to a defroster outlet, and a vehicle interior ventilation duct that guides air to a vehicle interior outlet, are provided in the defroster ventilation duct. is formed with a bent portion bent upward, and a baffle plate is attached to the inner duct wall near the bent portion, and the baffle plate uses the above mounting position as a fulcrum and uses its own weight to push the defroster ventilation duct away. The defroster is provided so as to be able to swing between a closed position and an approximately vertically upward open position in which the ventilation duct is opened by the pressure of the air in the defroster ventilation duct. A defroster flap is disposed to be openable and closable, and a heater flap is disposed to be openable and closable in the ventilation duct on the inside of the passenger compartment, and in a differential mode in which the heater flap is closed when the flap is opened, the baffle plate blows air only to the defroster ventilation duct. When the defroster flap is in the open position due to air pressure, and in the heater mode where both the defroster flap and heater flap are open, the baffle plate is positioned between the open position and the closed position due to the pressure of some of the air blown into the defroster ventilation duct. An automotive air conditioner characterized by: