JPS6210165Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention relates to a heater unit for an automobile that uses engine cooling water to appropriately adjust the temperature of air blown into a vehicle interior. More specifically, the present invention relates to an improvement in an automotive heater unit of the type having an air mixture chamber downstream of the heater core.

(Prior art) Automotive heater units use the heat of engine coolant to heat some or all of the air blown into the passenger compartment to create warm air, and usually use outside air or inside air to be selectively introduced. It is used in connection with an intake unit and a cooler unit if necessary. For example, such an air conditioner for an automobile includes the one shown in FIG. 6, which includes an intake unit 1 having a built-in suction fan 4, a cooler unit 2 having a built-in evaporator 5, and a heater unit having a built-in heater core 6. It is composed of 3. Then, the outside air, inside air, or a mixture thereof selectively introduced into the intake unit 1 is cooled by the cooler unit 2 as necessary or is passed through as it is without being cooled and introduced into the heater unit 3. The warm air obtained by heating a part of the air through the heater core 6 and the air that has bypassed the heater core are mixed in the air mix chamber 7 or without mixing, and are introduced into the vehicle interior through an appropriately selected outlet. Alternatively, all the introduced air can be passed through the heater core 6 to become warm air, or all the introduced air can be bypassed and left as cold air without being heated and blown into the vehicle interior from an appropriately selected air outlet. I try to let them do it.

This type of automotive air conditioner either blows outside air out of the vent outlet for ventilation, or
Alternatively, there is a vent mode that blows out cold air to cool the air conditioner, a heat mode that blows warm air from the floor outlet for heating, and a defrost outlet installed on the inside of the windshield that blows outside air or warm air to prevent fogging of the front windshield. It has three air conditioning modes including a defrost mode that prevents frost, but depending on the car model, it may also simultaneously blow relatively low-temperature cold air from the vent outlet and relatively high-temperature warm air from the floor outlet. It has a bi-level mode that creates a heating state that gives off a cold head and warm feet. Note that the cold air having a relatively low temperature is usually the outside air as it is.

Although not shown, the automobile heater unit 3 is connected to a vent outlet of an instrument panel and a differential outlet via a long duct. Therefore, even if the air mixed and blown out is insufficiently mixed within the air mix chamber 7, it is completely mixed while flowing through the duct and blown out into the vehicle interior. However, as shown in FIG. 6, the air is normally blown out to the floor through a short floor duct 8 that blows air directly into the vehicle interior. Therefore, promotion of air mixing within the duct 8 cannot be expected, and it is desired to improve the mixing performance within the air mixing chamber 7.

Therefore, conventionally, as shown in FIGS. 7 and 8, the bottom of the downstream side of the heater unit 3 is partitioned with a partition wall, so that the floor duct 9 can be inserted into the heater unit 3 and the air flow inside the unit 3 can be controlled. The air flowing out from the opening 10, which is formed in a horizontal direction perpendicular to the flow direction, and which is formed to connect the floor duct 9 and the air mix chamber 7, is directed in a horizontal direction perpendicular to the current flow direction. Once the flow is bent, it is divided into two in the orthogonal direction again and is blown out from the floor outlet 11 into the vehicle interior.By lengthening the flow path and bending the flow, the air is completely mixed and blown out. (1977-)
No. 5312).

(Problem to be solved by the invention) However, in these conventional heater units, in order to improve the air mixing performance in the heat mode, the duct is formed horizontally and a relatively long and curved floor duct flow path is constructed. As the ventilation resistance increases, the back pressure increases.
There is a disadvantage that the separation of hot air and cold air within the air mix chamber 7 cannot be made effective, and a large temperature difference cannot be maintained during the bilevel mode in which heating is performed to cool the head and feet.

In cold regions where the outside temperature is too low to hit the occupants' heads, this is not a problem and is preferable because it does not make them feel chilly, but in relatively warm regions, the lukewarm wind blows from the vent outlet. This causes the problem that the original bilevel mode function cannot be fully utilized.

Therefore, the present invention was developed for use in automobiles that can reduce the temperature difference in cold regions and increase the temperature difference in warm regions when in bilevel mode, even though it is possible to obtain sufficiently mixed and uniform air from the floor outlet. The purpose is to provide a heater unit.

Structure of the Invention (Means for Solving Problems) In order to achieve the above object, the automotive heater unit of the present invention has a detour for passing cold air formed above the heater core that warms the air passing through it. A mixing door that changes the ratio of the amount of air passing through the heater core and the detour is installed on the front surface of the upstream side of the heater core, and a mixing door is installed on the front side of the upstream side of the heater core to change the ratio of the amount of air passing through the heater core and the detour. An opening for the vent duct was created to distribute air towards the top, and an opening for the floor duct was established at a relatively lower position to communicate with the floor duct to distribute air towards the lower part of the vehicle interior. An automotive heater unit comprising: a side wall erected substantially perpendicularly to the flow of warm air passing through the heater core at a lower downstream position of the heater core; and a side wall fixed substantially perpendicularly to the top of the side wall. A floor duct partitioned by a floor surface and a casing of the heater unit is formed below an air mixture chamber formed downstream of the heater core, and an opening for the floor duct is opened in the floor surface. , a communication port communicating with the floor duct is provided in a part of the side wall, a temperature difference switching door for controlling the opening and closing of the communication port is rotatably attached to the communication port; A hot air guide plate is rotatably attached to the adjacent side wall to guide the hot air that has passed through the heater core to the communication port.

(Function) According to such an air conditioner for an automobile, during the bilevel mode to obtain heating for head cold and foot heat that is preferable depending on the environmental condition, the difference between the temperature of the air blown from the floor duct and the temperature of the air blown from the vent duct is adjusted. be able to adjust. Moreover, the temperature of the air blown from the floor duct becomes sufficiently uniform.

(Example) The configuration of the present invention will be described in detail below based on an example shown in the drawings.

FIG. 1 shows a partially cutaway perspective view of an embodiment of a heater unit embodying the present invention. This heater unit 20 has a heater core 21 for heating incoming air, and a mix chamber downstream of this heater core 21 has an opening 26 for a floor duct, an opening 28 for a vent duct, and an opening 29 for a differential duct. 22 and Mixture Chamber 2
2 and a floor duct 25 connected below the floor duct 2.

In this embodiment, the floor duct 25
is formed by partitioning the bottom of the downstream side of the heater unit 20 with a partition wall, and is usually integrally molded with the mix chamber 22 by injection molding of synthetic resin.

The heater core 21 is provided with a mix door 39 (FIG. 3) that adjusts the amount of air flowing into the heater core 21 and the amount of air flowing through a detour that bypasses the heater core 21.

The air mix chamber 22 is connected to the floor duct 2.
Part or all of the floor surface 23 of the air mix chamber 22 that partitions the heater core 21 is inclined in the front-rear direction perpendicular to the wind flow.
A butterfly door 27 is installed parallel to the wind flow by raising the hot air blowing area above the floor surface 24 and opening an opening 26 for a floor duct 25 in the inclined floor surface 23. The floor duct opening 26 is opened at a position that is preferably above the inclined floor surface 23 and away from the vent duct opening 28 that is formed on one side wall of the air mix chamber 22. A butterfly door 27 that opens and closes this opening 26 is installed parallel to the wind flow, and a mode switching controller (not shown)
It is rotatably provided by a known drive means (not shown) that works in conjunction with. When the butterfly door 27 is in the open state, the floor surface 23 of the air mix chamber 22 is such that when the butterfly door 27 is opened, the lower end of the door is at least the floor surface 24 of the warm air blowing area of the heater core 21 (FIG. 3).
It is preferable to set the inclination and lifting amount such that the position is higher than the above. Since the floor duct opening 26 is provided at the position described above, the warm air that has passed through the heater core 21 bends its flow path and flows into the floor duct 25.

As shown in FIGS. 1 and 2, the floor duct 25 has air outlet ports 30 and 31 on the opposite side as far as possible from the opening 26 provided at one corner of the air mix chamber 22. This is to make the wind flowing in from Yamba 22 flow in the front-back direction that is perpendicular to the previous flow direction.
Consideration has been given to increasing the duct length as much as possible to improve air mixing. The air outlets 30 and 31 of the floor duct 25 are designed to blow hot air directly from the heater unit 20 placed horizontally at the front of the vehicle compartment to the driver's seat side and the passenger seat side.
It is opened in the left and right direction parallel to the flow of wind in the floor duct 25 mentioned above. Further, air is distributed to the rear seat side by connecting a rear duct (not shown) to the rear air outlet 32. At the bottom of this heater unit 20, an air mix chamber 2
The floor duct 25 adjacent to the heater core 21 has a communication hole 35 in the side wall 34 facing the heater core 21 so that the hot air blowing area 36 (FIG. 3) of the heater core 21 can directly communicate with the inside of the floor duct 25. The hole 35 substantially forms a communication path. The communication hole 35 is formed in a substantially right triangular shape and faces only one side of the hot air blowing surface of the heater core 21 . As shown in FIG. 3, a door 37 for temperature difference switching is attached to the heater core side of the communication hole 35, with its lower end rotatably supported so that the opening and closing of the hole 35 can be controlled. It is being A hot air guide plate 38 is attached to a position adjacent to the door 37 so that its lower end side is rotatably supported by a shaft so that it can stand up and fall down. This hot air guide plate 38 is in an upright state as shown in FIG. 2, and faces one side of the hot air blowing area 36 of the heater core 21 on the opposite side from the communication hole 35, and collides with this opposing plate surface. The hot air is blocked from flowing into the air mix chamber 22 and guided so that it can easily flow into the floor duct 25 from the communication hole 35. The ceiling wall of the floor duct 25, which also serves as the bottom wall of the air mix chamber 22, that is, the floor surface 23 is connected to the communication hole 3 from the guide plate 38 side.
The guide plate 38 is inclined so as to gradually rise toward the 5th side, and the guide plate 38 is adapted to protrude above the height of the ceiling wall in the upright state. This information board 3
8 stands up when the temperature difference switching door 37 opens the communication hole 35, and falls down when the door 37 closes.

Therefore, the opening/closing switching control of the temperature difference switching door 37 is performed using a small temperature difference switch provided in the controller.
This is done via an operation force transmission cable, a negative pressure actuator, etc. in response to a switching operation of a temperature difference switching lever (not shown) that selects between two large temperature differences. The bi-level temperature difference switching lever is movable only when the mode lever is in the bi-level position, and is not movable in other mode positions.

Next, the action will be explained.

When a passenger desires heating with a cold head and feet heat with a small temperature difference, such as when driving in a cold region, if the passenger sets the temperature difference switching lever to the small temperature difference position, the temperature difference switching door 37 opens the communication hole 35. Closed, information board 38
falls down. In this state, when the bilevel mode is set, the mixer door 39 takes the desired temperature setting position, and the cold air from the cooler unit (normally, the cooler unit does not operate and is just outside air). A part of the air flows through the heater core 21 and is heated to become hot air, and the remaining part reaches the air mix chamber 22 as cold air. After passing through this air mix chamber 22, the cold air flows into the vent duct opening 28 located near the cold air path in the upper part, and the hot air bends the flow path and flows into the floor duct located near the heater core warm air outlet area in the lower part. It flows into the floor duct 25 from the opening 26. However, since the cold air and the hot air are not separated in the mix chamber 22, they mix with each other to some extent, and the temperature of the cold air increases and the temperature of the hot air decreases. Therefore, the temperature difference between the blown air between the vent duct opening 28 and the floor duct opening 26 becomes small as shown by the dotted line in FIG. 4, and the user does not feel chilly.

When the passenger desires to heat the head and feet with a large temperature difference such as when driving in a warm region, if the passenger sets the temperature difference switching lever to the position where the temperature difference is large, the temperature difference switching door 37 opens the communication hole 35. Opening, information board 38
stands up. In this state, the hot air blown from one half of the hot air blowing surface of the heater core 21 passes through the communicating hole 35 opposite thereto and directly flows into the floor duct 25 . Further, the hot air blown from the other half is prevented from flowing into the air mix chamber 22 by colliding with the upright guide plate 38, and most of it directly flows into the floor duct 25 through the communication hole 35. On the other hand, the cold air passing through the side of the heater core 21 flows into the vent duct opening 28 without almost contacting the warm air.

In this way, most of the warm air flows into the floor duct 25, so the temperature of the air blown out from the floor duct 25 increases compared to the above case, and the amount of warm air mixed with cold air decreases. The temperature of the air blown out from the vent duct opening 28 through the duct is lower than in the above case. Therefore, the difference in temperature blown out from the vent duct and the floor duct becomes large as shown by the solid line in FIG. 4, and heating suitable for cold heads and warm feet in warm regions can be obtained.

In the above embodiment, the case where the temperature difference setting is two-stage switching has been explained, but the temperature difference switching door is configured as an air volume control door that adjusts the volume of warm air flowing directly into the floor duct, and the temperature difference setting is stepless. It may also be possible to switch between them. In addition, selection of this temperature difference is not limited to the case where the passenger manually selects the temperature difference. For example, the selection of the temperature difference is not limited to the case where the outside temperature or the temperature difference between the upper and lower parts of the vehicle interior is detected by a temperature sensor, and automatic control is performed based on this detection result. You may do so.

Effects of the Device As explained above, according to the present invention, although it is possible to obtain sufficiently mixed and uniform blowing air from the floor outlet, when in the bilevel mode, the temperature of the blowing air of the floor duct and the vent It is possible to adjust the difference between the temperature of the air blown from the duct and to provide the most suitable heating for both cold and warm regions.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the present invention, in which Figure 1 is a partially cutaway perspective view, Figure 2 is a side sectional view, Figure 3 is a back sectional view, and Figure 4 is a blowout. 5 is a front sectional view showing another embodiment of the present invention, FIG. 6 is a principle diagram showing an example of a conventional automotive heater unit, and FIG. 7 is a diagram showing another conventional heater unit. The principle diagram of the unit, Fig. 8, is similar to that shown in Fig. 7.
FIG. 20... Heater unit, 21... Heater core, 22... Mixture chamber, 25... Floor duct, 26... Floor duct opening, 35...
...Communication hole (communication path), 37...door, 38...information board.

Claims (1)

[Claims for Utility Model Registration] A heater core 21 that heats the passing air is installed so that a detour for passing cold air is formed at the upper part, and the heater core 21 is attached to the front surface of the upstream side of the heater core 21 in a rotating position. A mixer door 39 is installed to change the ratio of the amount of air passing through the detour, and a vent duct opening 28 is provided at a relatively upper position on the downstream side of the heater core 21 to distribute air toward the upper part of the vehicle interior. In the automotive heater unit, a floor duct opening 26 is opened at a relatively lower position and communicates with a floor duct 25 for distributing air toward the lower part of the vehicle interior. A side wall 34 erected substantially perpendicular to the flow of hot air passing through the heater core 21 at a lower side position, a floor surface 23 fixed substantially perpendicularly to the top of the side wall 34, and a casing of the heater unit. A floor duct 25 is formed below the air mix chamber 22 formed on the downstream side of the heater core 21, and the floor duct opening 26 is formed in the floor surface 23.
At the same time, a communication port 35 communicating with the floor duct 25 is opened in a part of the side wall 34, and a temperature difference switching door 37 that controls opening and closing of the communication port 35 is rotated to the communication port 35. The side wall 34 adjacent to the communication port 35 can be attached freely.
A heater core for an automobile, characterized in that a hot air guide plate 38 for guiding hot air passing through the heater core 21 to the communication port 35 is rotatably mounted.