JPH0434086Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an air conditioning system for an automobile, and particularly to a structure near an air outlet for a defroster in a heater unit that constitutes a main part of the system.

(Prior Art) Generally, an air conditioner installed in a car uses a heater unit to adjust the temperature of the air supplied from a blower unit, and then sends the air from air outlets arranged in various parts of the car according to the selected air blowing mode. The heater unit is configured to emit air into the interior of the vehicle, and is typically configured as follows.

That is, a cold air passage and a hot air passage are provided in this heater unit, and the air supplied from the blower unit is distributed and introduced into both passages according to the position of the distribution door, and is also introduced into the hot air passage. The air is heated by a heater core installed on the passage, and then the air that has passed through both passages is combined and sent from each air outlet through a duct to the air outlet in each part of the car. It is configured. In this case, the air outlets include a front heater outlet, a rear heater outlet, a defroster outlet, left, right and center vent outlets, and doors for opening and closing these outlets, respectively. The air blowing mode is set by selectively opening and closing these doors through operations by the occupant, and the blowing temperature is adjusted by the position of the distribution door.

By the way, in this type of heater unit, it is necessary to properly mix the cold air and hot air that have passed through the cold air passage and the hot air passage, respectively, at the confluence of the cold air passage and the hot air passage. For example, Japanese Utility Model Application Publication No. 60-49008 discloses the following idea to improve this. That is, this idea is
In an automobile air conditioner configured to combine cold air distributed by an air mixer shutter (distribution door) and flowing out from a cold air outlet with hot air heated by a heater core, and blow the mixture into the vehicle interior from the outlet, A feature is that the cold air outlet is provided with a guide flange protruding inward from the case that guides the cold air toward the approximate center of the merging section, thereby improving the mixing of cold air and hot air. It will be improved.

(Problems to be solved by the invention) However, in this type of heater unit,
In addition to mixing hot air and cold air well as described above, this air is also
It is necessary to send a sufficient amount of air from the air outlets, but in the configuration shown in the above publication, the air (cold air) collides with the guide flange, which weakens the force and reduces the amount of air sent from each outlet. It's inconsiderate.
In particular, if the air outlet is provided on the side of the case due to the structure of the heater unit or the layout of the surrounding area, it becomes difficult for air to be introduced into the air outlet from the confluence of the hot air passage and the cold air passage. The required amount of air will not be delivered.

(Means for Solving the Problems) The present invention addresses the above-mentioned circumstances in conventional air conditioners. The purpose of this system is to ensure that when the air outlet of the heater unit is opened on the side of the heater unit case, air can be sufficiently sent out from this outlet without weakening the force, and in order to achieve this purpose, It is characterized by the following configuration.

That is, the automobile air conditioner according to the present invention has the following features:
In the structure in which the air introduced into the heater unit case is divided into a hot air passage that passes through the heater core and a cold air passage that does not pass through the core, the air is merged again and sent out from the air outlet to each part of the vehicle interior. An air outlet for the defroster is provided near the confluence of the hot air passage and the cold air passage on the side surface of the case, and a defroster duct with a defroster door installed in the outlet is provided in a protruding manner on the outer surface of the case. A constriction part is provided at a position upstream of the confluence part of the passage with the hot air passage, the constriction part protruding inward of the case and constricting the passage cross-sectional area of the cold air passage. and,
The defroster door is extended inward of the case so that its inner end protrudes into the case at least to the vicinity of the inner end surface of the throttle portion.

(Function) According to the above configuration, among the air introduced into the heater unit case and distributed to the hot air passage and the cold air passage, the air distributed to the cold air passage is passed through the throttle provided in the passage. The flow velocity will be increased when passing through the section, and therefore the cold air and the hot air will be mixed well at the confluence section of both passages. When this air flows into the defroster duct from the confluence section through the air outlet provided on the side of the heater unit case, the defroster door that opens and closes the duct extends inward of the case.
The air is guided smoothly and reliably into the defroster duct by the extension of the door, so that if the defroster air maintains its momentum, it will be sufficiently delivered.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

As shown in FIG. 1, the heater unit 1 has an outer shell formed by joining a pair of two halves of cases 2, 2, and one of the cases 2 has an approximately fan-shaped opening on the side surface. An air inlet 3 is provided through which air is introduced from a blower unit (not shown). In addition, an air outlet 4 for a central vent and an air outlet 5 for left and right vents are provided in the upper part of the unit 1, spanning both cases 2, 2, and on the sides of both cases 2, 2, an air outlet 4 for a front heater is provided. Air outlets 6, 6 are provided, respectively, and an air outlet 7 for a rear heater is provided at the bottom, spanning both cases 2, 2. Furthermore, defroster air outlets 8, 8 are provided on the side surfaces of both cases 2, 2, respectively, and defroster ducts 9, 9 are provided in these outlets 8, 8 in a protruding shape on the outer surfaces of cases 2, 2, respectively. They are installed consecutively.

Next, the internal structure of this heater unit 1 is
To explain with a diagram, first, a heater core 10 is installed in the unit 1 at a position directly below the air inlet 3 to which engine cooling water is supplied and heats the air passing around the air inlet 3. A distribution door 11 is provided inside. The distribution door 11 is located at a first position along the upper side of the air inlet 3, indicated by a chain line A, and at a first position along the upper side of the air inlet 3, indicated by a chain line B, and at a first position along the upper side of the air inlet 3, indicated by a chain line B, about a support shaft 11a supported at the top corner of the air inlet 3, which is approximately fan-shaped. 3, and when in the first position A, the entire amount of air introduced from the inlet 3 is guided to the hot air passage A passing through the heater core 10. When it is in position B, the entire amount of air is guided to the cold air passage B that does not pass through the heater core 10, and when it is in the position shown by the solid line C between the first and second positions A and B, it corresponds to that position. Air is distributed to both passages A and B in proportion. And the above hot air passage A
The defroster is guided from below the heater core 10 to the cold air passage B side by a guide wall 12 erected inside the case 2, and both passages A and B are opened on the side of the air inlet 3. They are designed to merge at a merging portion C near the air outlet 8. Here, the distribution door 11 is integrally provided with an auxiliary door 11 on the opposite side of the support shaft 11a, and when the distribution door 11 is in the second position B, the air inlet 3 and the upstream part of the hot air passage A are connected. When the auxiliary door 11 shuts off the downstream part of the passage A and the merging part C, the air introduced into the cold air passage B side flows through the hot air passage A toward the heater core 10 side. It is designed to prevent water from flowing backwards.

Further, the confluence C of the hot air passage A and the cold air passage B communicates with the air outlets 4 and 5 for the center vent and the left and right vents via the space D, and also connects the guide wall 12 and the case 2. It is led to the front heater air outlet 6 to the rear heater outlet 7 through a heater passage E formed between the front heater air outlet 6 and the peripheral wall 2a.
The air outlets 4, 5 for the center vent and the left and right vents are provided with doors 13, 14 that swing around support shafts 13a, 14, respectively, to open and close these outlets 4, 5, and A door 15 is provided at the entrance of the heater passage E to open and close the passage E by swinging about a support shaft 15a.

On the other hand, a defroster door 16 is provided within the defroster duct 9. This door 16 is
As shown in FIGS. 3 and 4, a single support shaft 16 extends between the sides of the left and right defroster ducts 9, 9 attached to the outer surfaces of the pair of cases 2, 2, respectively.
a, and left and right door portions 16b, 16b provided at both ends of the support shaft 16a, and these door portions 16b, 16b move to the open position shown in solid lines in FIG. 2 with the support shaft 16a as the center. By swinging to the closed position shown by the chain line, the passage entrance portions in the two ducts 9, 9 are opened and closed, respectively.

However, in this heater unit 1, in addition to the above-mentioned configuration, there is a confluence section C from the air inlet 3.
Throttle portions 17, 17 are provided to narrow the cross-sectional area of the cold air passage B by constricting it from both sides.
These narrowing portions 17, 17 are connected to the cases 2, 2
Inward the area narrowed between the opening of the air inlet 3 (in the case 3 where the inlet 3 is not provided, the area facing the inlet 3) and the opening of the defroster air outlets 8, 8. It is formed by bulging out.

Further, the left and right door portions 16b, 16b of the defroster door 16 are extended inwardly of the cases 2, 2 through defroster air outlets 8, 8 opened on the side surfaces of the cases 2, 2, and the extension portions 1
The inner ends of 6b〓, 16b〓 are the above-mentioned constricted parts 17, 1
It is thrust into the cases 2, 2 so as to reach the positions of the inner end surfaces 17a, 17a of 7.

Here, the distribution door 11 is swung by operating a temperature control lever provided in the driver's seat of the vehicle, and the other doors 13, 14, 15,
16 are adapted to be opened and closed, respectively, by operating a ventilation mode switching lever. In addition, each door 11,
A sealing material made of urethane or the like is pasted to 13 to 16 to prevent a gap from forming between the cases 2 and 2 when closed.

According to the above configuration, the air introduced into the cases 2, 2 of the heater unit 1 from the air inlet 3 is
When the distribution door 11 is in the first position A, the air is guided to the hot air passage A, when the door 11 is in the second position B, the air is guided to the cold air passage B, and when the door 11 is in the intermediate position C, the air is guided to the hot air passage A. It is distributed to A and B, and in both cases, it passes through the confluence part C to the door 13,
air outlet 4, with 14, 15, 16 open;
5, 6, 7, and 8, and is sent out from the outlet to the air outlets in various parts of the car. In that case,
The air passing through the hot air passage A is the heater core 10
Since the air is heated by the passage A, the temperature of the air blown into the vehicle is adjusted depending on the amount of air passing through the passage A, that is, the position of the distribution door 11.

However, when the distribution door 11 is located at the intermediate position C to distribute the air into the hot air passage A and the cold air passage B, the air that has passed through both passages A and B is mixed well at the confluence part C. Air of uniform temperature must be sent out from each outlet. On the other hand, in this heater unit 1, constricted portions 17, 17 are provided on the cold air passage B between the air inlet 3 and the confluence portion C.
is provided to narrow the cross-sectional area of the passage B, the flow velocity of the air (cold air) passing through the passage B is increased, and the hot air flowing from the hot air passage A side at the merging portion C is increased. The cold air, which has a higher flow velocity, collides vigorously with the air, resulting in good mixing of the two.

In addition, in this heater unit 1, the defroster air outlets 8, 8 are opened on the side surfaces of the cases 2, 2 due to the layout of the surrounding structural area. If the defroster air were to be delivered later, the direction of the air flow would have to bend outward, resulting in less momentum and not enough air being delivered. However, in this heater unit 1, the door portions 16b, 16b at both ends of the defroster door 16, which open and close the internal passages of the defroster ducts 9, 9 connected to the defroster air outlets 8, 8, 8 and extends and protrudes inward from the case, so that the air flows from the hot air passage A side and the cold air passage B side, respectively, as shown by arrows a and b in Figures 2 to 4. While merging at the merging portion C, the door portion 16b,
It is received by the extension portions 16b〓, 16b〓 of 16b and is smoothly and reliably guided into the defroster air outlets 8, 8 or the defroster ducts 9, 9. As a result, the required amount of defroster air is delivered from the heater unit 1 during the defroster mode.

(Effects of the invention) As described above, according to the air conditioner for an automobile according to the invention, hot air and cold air are well mixed within the heater unit without their momentum being weakened, so that the temperature is uniform. Air will be pumped into the car. Furthermore, even if the air outlet for the defroster is opened on the side of the case due to the structure of the heater unit or the layout of the surrounding area, it is possible to reliably send out the required amount of air during the defroster mode. As a result, the performance of the heater unit in this type of air conditioner is improved.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is an overall perspective view of a heater unit, FIG. 2 is a sectional view showing the internal structure of the unit, and FIG. 3 is a cross-sectional view of the heater unit.
FIG. 4 is a longitudinal sectional front view of the main part cut along the line, and FIG. 4 is a cross-sectional plan view of the main part cut along the line FIG. 1... Heater unit, 2... Case, 8... Defroster air outlet, 9... Defroster duct,
10... Heater core, 16b... Defroster door (door part), 17... Throttle part, A... Warm air passage, B
...Cold air passage, C...merging section.

Claims (1)

[Scope of utility model registration request] Air conditioning for an automobile in which air introduced into a heater unit case is divided into a hot air passage that passes through a heater core and a cold air passage that does not pass through the core, and then is combined again and sent to various parts of the car from an air outlet. In the device, an air outlet for a defroster is provided near a confluence of a hot air passage and a cold air passage on a side surface of the case, and a defroster duct having a defroster door installed therein is connected to the outlet. , a constriction part is provided on the upstream side of the confluence part of the cold air passage with the hot air passage, the constriction part protruding inward of the case and constricting the passage cross-sectional area of the cold air passage;
An air conditioner for an automobile, wherein the defroster door extends inward of the case, and an inner end thereof protrudes at least to the vicinity of an inner end surface of the throttle part.