JPS62198514A - Air conditioning device for automobile - Google Patents

Abstract

PURPOSE:To improve air mix ability by arranging the constitution in such a way that cold blast is divided into two, one of which is made to directly flow into an air mix chamber and the other of which is made to flow into it through a heater chamber and both are made to orthogonally joins with each other. CONSTITUTION:Cold blast sent to a heater unit 6 flows into the first cold blast passage 8 and the second cold blast passage 9 according to the opening degree of a warm blast quantity adjusting door 24 and a cold blast quantity adjusting door 23. The cold blast in the first cold blast passage 8 flows into a warm blast passage 14 after being heated with a heater core 11 after passing through a heater inflow port 20, and then flows, with nearly orthogonal angle, into an air mix space 15 on the second cold blast passage 9 according to the opening degree of the door 24 through a warm blast outflow port 24 and joins with each other. Accordingly the warm blast and the cold blast are sufficiently mixed and them discharged from a vent blow out port 18. By this constitution, air mix ability can be improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an air conditioner for an automobile, and in particular to an air conditioner that mixes warm air and cold air passing through a ventilation duct to supply temperature-controlled air into a vehicle interior. This invention relates to an air conditioning system for automobiles that uses a blowout air mix method.

[Conventional technology]

Conventional glue heat air mix type air conditioners that are commonly used as air conditioners for automobiles are disclosed in Japanese Patent Application Laid-open No. 57-37008 and Japanese Patent Laid-open No. 58-22171, for example.
As shown in Publication No. 4, etc., a heater core and a cold air bypass passage are provided in parallel in the ventilation duct, and the cold air in the ventilation duct is distributed to the heater core and the cold air bypass passage while adjusting the air volume according to the opening degree of the air mix door. However, the temperature of the air blown into the passenger compartment was controlled by mixing the warm air that passed through the heater core with the cold air that passed through the cold air bypass.

This kind of heat air mix type air conditioner has advantages such as quick response of outlet temperature control and is not affected much by changes in engine speed, but the following points should be improved. I had a problem.

[Problems to be solved by the invention]

This type of air conditioner is required to improve the air mix of cold air and hot air, and for this reason, conventional measures have been taken such as installing a wind direction plate in the air mix section to promote the mixing of cold air and hot air. However, such air mix improvement measures increase the ventilation resistance in the ventilation duct, resulting in a decrease in the amount of air blown out,
This was a cause of noise generation.

In addition, in conventional air conditioners, one air mix door distributes cold air between the heater core and the cold air bypass passage, but in this type of air mix system, the heater core and the cold air If the air mix door opening (cold air inlet) on the heater core side, which has a large ventilation resistance, is small because the space of the cold air inlet of the bypass passage changes, the cold air will flow toward the heater core side. The cold air tends to flow toward the cold air bypass passage where the ventilation resistance is small, and it is difficult to control the blowout temperature with high accuracy.

The present invention has been made in view of the above points, and its purpose is to improve the air mixing performance of cold air and hot air while reducing the ventilation resistance in the ventilation duct, and to To provide an air conditioner for an automobile, which has a blowout temperature characteristic, can perform blowout temperature control with high accuracy, and can set the blowout position of a ventilation duct to a position suitable for distribution of blowout air. It is in.

[Means for solving problems]

In order to achieve the above object, the present invention provides an air mix type air conditioner, in which a heater chamber for accommodating a heater core is disposed in a part of a ventilation duct, and cool air passes through the ventilation duct on the side of the heater chamber. A first cold air passage and a second cold air passage are formed separately, and the first cold air passage has its cold air inlet always open and communicates with the heater chamber; The second cold air passage constitutes a cold air bypass passage for bypassing the cold air to the side of the heater chamber, and furthermore, an air mix space is formed on the terminal side of the second cold air passage, and a side surface of the air mix space is formed. an outlet side passage of the heater chamber is connected to the heater chamber so that the warm air sent out from the heater chamber joins the cold air passing through the second cold air passage at right angles in the air mix space; , a cold air volume adjustment means is provided on the second cold air passage side, and a warm air volume adjustment means is provided on the outlet side passage of the heater chamber.
The JXAm means are arranged respectively so that the air volume ratio of cold air and hot air can be adjusted individually, and furthermore, a cooling mode outlet and a heating mode outlet are respectively arranged near the air mix space of the second cold air passage. This is what I did.

[Effect]

According to the present invention having such a configuration, the cold air passing through the single ventilation duct is divided into the first cold air passage and the second cold air passage, and the cold air on the second cold air passage side bypasses the heater chamber. The cold air on the first cold air passage side is directly sent to the air mix space, and on the other hand, the cold air on the first cold air passage side is warmed in the heater room, and then flows into the air mix space ulff from the side and merges with the cold air on the second cold air passage at right angles. Therefore, cold air and hot air are sufficiently mixed, and the air mix can be improved.

In addition, the temperature of the air blown into the vehicle interior is controlled by individual air volume adjustment using a warm air volume adjustment means provided on the outlet side passage of the heater compartment and a cold air volume: s4m means provided on the second cold air passage side. This is done by When adjusting the air volume, the cold air inlet on the first cold air passage side is always open so that a sufficient amount of cold air can flow into the heater core, which has a large ventilation resistance. A sufficient quantity of hot air flows out, and the amount of hot air always flows into the air mix space in accordance with the opening degree of the hot air volume adjusting means.

On the other hand, since the amount of cold air corresponding to the opening degree of the cold air volume adjustment means also flows into the second cold air passage side, the cold air and warm air merge after appropriate air volume adjustment, allowing highly accurate blowout temperature control. can be carried out.

Further, after the hot air and the cold air are mixed, they are blown into the vehicle interior from a predetermined air outlet through an air distribution duct. In this case, in the cooling mode, air is sent to the center of the front of the vehicle through the air distribution duct.
Air is blown out to the driver's seat and passenger seat side. By the way, since the air distribution duct on the passenger seat side is arranged in the opposite direction to the flow direction of the ventilation duct, the air distribution efficiency tends to be lower than that of the air distribution duct on the driver's seat side. In this case, the total length of the ventilation duct can be significantly shortened by arranging the second cold air passage and the air mix space in parallel with the heater compartment, so the outlet of the first ventilation duct can be placed in the center of the front of the passenger compartment or on the passenger side. By moving the air distribution duct closer to the air outlet, it is possible to reorient the arrangement of the air distribution duct on the passenger seat side to the direction in which the air distribution duct is arranged in relation to the outlet of the ventilation duct so that the air flow is smoother, thereby improving the air distribution efficiency on the passenger seat side. can.

〔Example〕

An embodiment of the present invention will be explained based on FIGS. 1 to 4.

Fig. 1 is an overall configuration diagram showing one embodiment of the present invention, Fig. 2 is a schematic perspective view of a heater unit used in this embodiment, and Fig. 3 is a cross section showing the internal structure of the heater unit. In the figure, 1 is a ventilation duct of an air conditioner.

2a is an outside air introduction part provided at one end of the ventilation duct 1, 2b is an inside air introduction part, 3 is an inside/outside air switching door, and 4 is an outside air introduction part 2a.
Alternatively, air introduced from the inside air introduction part 2b can be used in the ventilation duct 1
5 is an evaporator that dehumidifies and cools the air passing through the ventilation duct 1 to produce cold air; 6 is an evaporator 5
This is a heater unit that adjusts the cold air blown to a predetermined blowing temperature and blows it into the vehicle interior.

The heater unit 6 is attached to a casing 7 as shown in FIG.
A heater chamber 12 that accommodates a heater core 11 is formed in the lower part of the casing 7, and a heater chamber 12 that accommodates the heater core 11 is formed in the upper part of the casing 7.

A first cold air passage 8 and a second cold air passage 9, which guide the cold air blown from the ventilation duct 1, are connected to each other through a partition wall 10.
The passages 8 and 9 are separately arranged on the sides of the heater chamber 12. Further, the terminal end of the first cold air passage 8 is partitioned by a partition wall 13 of the casing 7,
A hot air passage 14 is defined through a partition wall 13 in a common adjacent area of the first cold air passage 8 and the heater chamber 12, and an air mix space 15 is defined at the end of the second cold air passage 9 through a partition wall 16. It is arranged adjacent to the hot air passage 14 via the hot air passage 14. This air mix space 15 is located in the casing 7
It has a space from the top to the bottom of the second
Near the air mix space 15 of the cold air passage 9, a defroster outlet 17 is arranged at the top, and a vent outlet 18 is arranged on one side of the second cold air passage 9 near the center. A floor outlet 19 is provided at the lower part of the section 15.

Further, a heater inlet 20 that communicates with the heater chamber 12 is provided on the lower surface of the first cold air passage 8, and a heater outlet that communicates the heater chamber 12 and the hot air passage 14 is provided on the lower side of the partition wall 13. 21 is provided, and the partition wall 16 is provided with a hot air outlet 22 that communicates the hot air passage 14 with the air mix space 15 of the second cold air passage 9. With the heater unit 6 having such a configuration, the cold air passing through the second cold air passage 9 flows directly to the air mix space 15 side, and on the other hand, the cold air passing through the first cold air passage 8 flows through the heater inlet 20. The air flows into the heater chamber 12 through the heater core 11, becomes hot air, passes through the heater outlet 21, the hot air passage 14, and enters the air mix space 15 through the hot air outlet 22.
This warm air is blown out to the side and merges with the cold air from the second cold air passage 9 almost perpendicularly, and the mixed air after merging is mixed with the air from the defroster outlet 17. Air is selectively emitted from either the vent outlet 18 or the floor outlet 19.

Although not shown in the schematic diagram of the heater unit in FIG. 2, the cold air volume adjustment door 23 as shown in FIG. Hot air volume adjustment door 24. Pent-defroster switching door 25. A floor outlet opening/closing door 26 and the like are provided.

In FIG. 1, the above-mentioned heater unit 6 is shown as viewed from the front (I), as viewed in cross-section along the X-X line (II), and as viewed in cross-section along the Y-Y line (III). It is divided into two parts (flAcI).

As shown in (■) and FIG. 3, a cold air volume adjustment door 23 is arranged on the inlet side of the second cold air passage 9, a hot air volume adjustment door 24 is arranged on the hot air outlet 22 of the hot air passage 14, and this The air volume adjustment door 24 and the cold air volume adjustment door 23 are linked via a link end 27 so that they can open and close in opposite directions. Also, state! As shown in (m), the second cold air passage 9 is provided with a pent-defroster switching door 25 that switches between the defroster outlet 17 and the vent outlet 18, and the floor outlet 19 is provided with a pent-defroster switching door 25 that switches between the defroster outlet 17 and the vent outlet 18.
An opening/closing door 26 that opens and closes 9 is provided.

29 is a cold air volume adjustment door 23. A servo mechanism 30 that controls the opening degree of the hot air volume adjustment door 24 is an actuator for controlling vent-defroster switching, 31 is an actuator that controls opening and closing of the floor outlet 19, and 32 is an actuator for controlling internal/external air switching.

The heater core 11 described above performs a heating operation by introducing and circulating engine cooling water, and the heater core 11 is provided with a hot water valve 33.

Next, a control system for controlling the air conditioner of this embodiment will be explained. The air conditioning control system is a means of controlling air volume.

It is composed of a blowout temperature control means, a mode control means, etc. In the wiring diagram of FIG. 1, solid lines indicate electrical wiring and broken lines indicate vacuum hose piping.

The air volume control means includes a rheostat 35 whose output is controlled by a fan lever 35a and a fan control amplifier 36, and steplessly controls the current flowing through the power transistor in the fan control amplifier 36 by changing the resistance of the rheostat 35. , controls the fan speed of the blower 4 and adjusts the amount of air blown.

The mode control system consists of a latch type push button switch 38 that is controlled by various mode buttons 378 to 37d, a logic circuit 39, and mode switching solenoid valves 40a to 40d. The actuators 30, 31, 32 are controlled by selective on-off control of the pushbutton switch 38 and the opening/closing of the corresponding one of the solenoid valves 40a to 40d via the logic circuit 39, thereby controlling the actuators 30, 31, 32 in each mode. Switching door 3゜25
．． 26 is switched and controlled. Actuator 30.31.
Switching control 32 is performed by negative pressure operation (utilizing the negative pressure of the engine intake manifold) when the solenoid valve is opened and by atmospheric operation when the solenoid valve is closed. Table 1 shows a negative pressure operation table for each mode.

1st Table 0: Negative pressure continuity Servo mechanism 29 with temperature control circuit (CPU) 42, solenoid valves 40e and 40f, and position detection potentiometer 47
Consists of etc. This temperature IIJ control is performed by a position detection potentiometer 47 linked to the servo mechanism 29 and a temperature control (TE).
MP) The temperature control circuit 42 compares and judges the voltage difference (deviation) of the temperature setting potentiometer 41 interlocked with the lever 41a, and controls the movement of the servo mechanism 29 so that this voltage difference becomes zero.

Here, a series of operating systems of the temperature control system will be explained.

Position detection potentiometer 4 linked to servo mechanism 29
The partial pressure value of 7 changes from high pressure to low pressure as it moves from the hot side to the cool side (in the direction of arrow B), while the temperature setting potentiometer 4 linked to the temperature control lever 41a
1 is similarly set so that the partial voltage at the common terminal changes from high voltage to low voltage as it moves from the hot side to the cool side. Therefore, both potentiometers 47.41.
When the temperature setting potentiometer 41 is moved to the cooler side from the current position using the temperature control lever 41a when the voltage difference (deviation) is 0, the deviation becomes (+), and in the same way, the temperature setting potentiometer 41 is moved to the cooler side than the current position. If you move it to the hot side from the current position, the deviation becomes (-). When the deviation is (+) or (-), the temperature control circuit 42 controls the solenoid valves 40e and 40f as follows to move the servo mechanism to the position where the deviation is zero. That is, the solenoid valve 40e is a three-way valve that switches between atmospheric pressure and negative pressure.
f constitutes a switch valve that turns on and off the output, the output side of the solenoid valve 40e and the input side of 40f are connected, the negative pressure side is connected to the input of 40e, the output side of 40f is connected to the servo mechanism 29, and the potentiometer 47 The deviation between and 41 is (+
), the temperature control circuit 42 controls the solenoid valves 40e and 40.
When f is operated and controlled at the same time and the deviation is (-), solenoid valve 4
Only 0f is operationally controlled. Therefore, if the temperature control lever 41a is moved to the cool side from the current position where the deviation between the 1st position detection potentiometer 47 and the temperature setting potentiometer 41 is (0), the deviation of the potentiometer will be (+
), so the solenoid valves 40e and 40f operate simultaneously,
Negative pressure is applied to the servo mechanism 29 so that the servo mechanism 29 increases the amount of cold air (the opening degree of the amount of cold air adjustment door 23).

In addition, the solenoid valve moves so that the hot air volume (opening degree of the hot air volume adjustment door 24) decreases, and when the partial pressure point of the position detection potentiometer 47 reaches the position of the deviation O from the temperature setting potentiometer 41 due to this movement, the solenoid valve 40e and 4Of are turned off to stop the servo mechanism 29 at a predetermined blowing temperature position.

Similarly, when the temperature control lever 41a is moved to the hot side, the deviation of the potentiometer becomes (-), so only the switch valve 40f operates, while the three-way valve 40f operates.
0e enters the atmosphere introduction state due to off operation, and as a result,
The servo mechanism 29 is brought into the atmospheric pressure state via the switch valve 40f, and the servo mechanism 29 moves to the hot side (in the direction of the arrow).

It stops at the point where the deviation of the potentiometer becomes O.

Next, the operation in this embodiment will be explained.

First, when performing maximum cooling operation in the vent mode (cooling mode), first set the temperature control lever 41a to the maximum cooling position, turn on the vent button 37d, and press A.
By inputting the /C switch 37a and setting the fan lever 35a to the bi position, the air conditioning control system performs a predetermined operation through this series of operations, and the inside/outside air switching door 2
3 enters the internal air circulation mode as shown by the dotted line, the normally open hot water valve 33 closes and the hot water flowing into the heater core 11 is closed, the vent-defroster switching door 25 enters the vent mode, and the servo The cold air volume adjustment door 23 of the second cold air passage 9 is fully opened via the mechanism 29 and the interlocking mechanism 27, while the hot air volume adjustment door 24 of the hot air passage 14 is fully closed. In addition, by pressing the A/C% switch 37e, the air conditioning +1 b sear 43 is activated, the 'tfl magnetic clutch 44 is activated, the compressor and other refrigeration cycle installation equipment (not shown) are activated, and the evaporator 5 is activated. become.

In the vent mode i during maximum cooling, internal circulating air is blown by the blower 4.

The cold air dehumidified and cooled by the evaporator 5 is blown to the heater unit 6 side. The cold air blown to the heater unit 6 side is
It leads to the first cold air passage 8 and the second cold air passage.
Hot air outlet 22 of the hot air passage 14 communicating with the cold air passage 8 side
is in the fully closed state by the hot air volume adjustment door 24, so the cold air flows into the second cold air passage 9 side which is in the fully open state. In this embodiment, since the vent outlet 18 is provided directly in the second cold air passage 9, the cold air can be blown out directly from the vent outlet 18 via the second cold air passage 9, thereby reducing ventilation resistance. This allows the maximum amount of cooling air to be blown smoothly into the vehicle interior with low noise, speeding up the cooling of the vehicle interior.

If the temperature inside the car drops due to the above driving conditions,
First, set the fan lever 35a so that it gradually becomes a low level. However, if the temperature inside the vehicle is low, the temperature control lever 41a is set to a temperature control range between cool and hot to adjust the room temperature to a comfortable level. That is, when the temperature control lever 41a is moved from the maximum cooling position to the temperature control range, the inside/outside air switching valve 2 becomes the outside air introduction mode and the hot water valve 33 is turned off (valve opening operation) due to the operation of the predetermined air conditioning control system. The heating of the heater core 11 is controlled. Furthermore, when the temperature control lever 41a is moved from the maximum cooling position to the temperature control range, the servo mechanism 29 is activated as described above.
The deviation between the side position detection potentiometer 47 and the temperature setting potentiometer 41 becomes (-), the actuator 29 moves to the hot side (in the direction of the arrow) where the deviation becomes 0, and stops at the point where the deviation becomes 0. Cold air volume 7i
! The opening degree on the fifth adjustment door 23 side is controlled to be smaller than the previous state, and the opening degree of the hot air volume adjustment door 24 increases accordingly.

In this state, the first cold air passage 8 and the second
Cold air flows into each of the cold air passages 9 according to the opening degree of the warm air volume adjustment door 24° and the cold air volume adjustment door 23. The cold air on the first cold air passage 8 side enters the heater chamber 12 through the heater inlet 20 provided in this passage 8 and enters the heater core 1.
1, the air flows into the hot air passage 14 as hot air, and through the hot air outlet 22, the air mix on the second cold air passage 9 side is adjusted to the amount of air according to the opening degree of the hot air volume adjustment door 24. It flows into the space 15. This warm air is air mix space 1
At step 5, in order to join the cold air flowing through the second cold air passage 9 side in a substantially orthogonal state, the hot air and cold air are sufficiently mixed, and then flowed from the vent outlet 18 through an air distribution duct (not shown) to a predetermined location. The air is blown out from the air distribution position.

Next, the operation in floor mode (heating mode) will be explained.

When the temperature setting lever 41a is set to the maximum heating (full hot) position, the servo mechanism 29 follows this and is at the full hot position (terminal position in the direction of arrow A), communicating with the first cold air passage 8 side. The hot air volume adjustment door 24 of the hot air passage 14 is fully open, and the cold air volume adjustment door 2 of the second cold air passage 9 is fully open.
3 is in a fully closed state, the heater core 11 is in a heating state, and the evaporator 5 is in a stopped state. Further, when the floor mode switch 37b is in the on state, the solenoid valve 40d is brought into a negative pressure conducting state as shown in Table 1, and the floor door 26 is opened.

Therefore, in such a state, cold air (outside air) introduced from the outside passes through the ventilation duct 1 and flows into the first cold air passage 8.
After being heated by the heater core 11, it becomes hot air and flows into the hot air passage 14. Passing through the air mix space 15,
The air is blown out from the floor air outlet 19. In this case, since no cold air flows into the second cold air passage 9 side, there is no mixing of cold air and hot air in the air mix space 15.
Warm air with the highest temperature is blown into the vehicle interior.

In addition, the temperature control lever 41a can be adjusted from maximum heating to temperature control range (
(between hot and cool), the temperature control circuit 4
2. Through a series of operations of the solenoid valves 40e and 40f, the servo mechanism 29 moves in the direction of arrow B until the deviation between the temperature setting potentiometer 41 and the position detection potentiometer 47 becomes 0, and the opening degree of the hot air number adjustment door 24 is changed from the previous one. The opening degree of the cold air volume adjusting door 24 increases accordingly.

Therefore, in this case, the first. Second, cold air and warm air flow into the cold air passages 8 and 9 according to the opening degree of the 5I adjustment door 23, 24, and the cold air on the first cold air passage 8 side flows through the heater core 11 as described above. The cold air enters the air mix space 15 as warm air, and the cold air on the second cold air passage 9 side is blown directly into the air mix space 15, and the two merge almost perpendicularly to form appropriately temperature-controlled warm air. The air is then blown out from the floor air outlet 19.

Therefore, according to this embodiment, the following effects can be achieved.

(1) Since the cold air and the hot air are orthogonally joined (mixed) in the air mix space 15, the air mix performance is improved and the temperature unevenness of the blown air can be reduced as much as possible. Also,
The means for orthogonally merging can be achieved by utilizing the rational arrangement structure of the cold air passage 8.9 and the hot air passage 14, without providing a wind direction plate as a ventilation resistance element in the ventilation duct as in the conventional case. 1 By reducing the ventilation resistance of the ventilation duct, it is possible to increase the air volume, reduce noise, and reduce the power consumption of the ventilation blower.

(2) The ratio of the cold air volume and the hot air volume can be adjusted through separate air volume adjustment means 23 and 24, and,
By always opening the cold air inlet on the side of the first cold air passage 8 that introduces cold air into the heater core 11, it is set in advance so that a sufficient amount of cold air can flow into the side of the heater core 11, which has a large ventilation resistance. A sufficient quantity of hot air flows out to the exit side of the chamber 12, and an amount of hot air always flows into the air mix space 15 according to the opening degree of the hot air regulating means 24.
On the other hand, since the amount of cold air corresponding to the opening degree of the cold air volume adjustment door 23 also flows into the second cold air passage 9 side, a linear blowout temperature characteristic can be obtained, and highly accurate blowout temperature control can be performed.

Figure 4 shows a comparison of the air outlet temperature characteristics of the 9th embodiment and a conventional air conditioner. In contrast to the 5th embodiment, a linear temperature characteristic as shown by the broken line in the figure can be obtained. As explained in detail in [Problems to be Solved by the Invention], the conventional air mix system adjusts the proportion of air volume on the inlet side of the heater core and the cold air bypass passage, so it is particularly effective in reducing ventilation resistance. If the air mix opening (inflow space) on the large heater core side is small,
Since the cold air flows towards the heater core side, it is biased towards the cold air bypass passage side where the ventilation resistance is small by <<1, so the blowout temperature characteristic has a nonlinear characteristic as shown by the solid line in Figure 4, which improves the accuracy of blowout temperature control. I don't get it.

(3) Also, in this embodiment, as shown in FIGS. 1 to 3, the first cold air passage 8. 2nd cold air passage9. The heater chamber 12 is arranged in parallel, and the hot air passage 14 and the air mix space 1
5 are arranged in parallel with each other, the overall length of the heater unit 6 itself and the ventilation duct 1 can be shortened.
Moreover, since the vent outlet 18 can be arranged closer to the center of the second cold air passage 9, the vent outlet 18 can be installed closer to the center of the front part of the vehicle interior or closer to the passenger seat side. Therefore, the arrangement direction of the ventilation duct, which is arranged in the opposite direction to the flow direction of the ventilation duct 1, can be changed as much as possible to the direction that will make the flow of air smoother, greatly increasing the efficiency of air distribution on the passenger seat side. can be improved.

(4) Furthermore, during maximum cooling, the cold air is blown directly to the vent outlet 18 via the second cold air passage 9 with low ventilation resistance, increasing the maximum cooling air volume and reducing noise. obtain.

In the above embodiment, the cold air volume adjustment door 23 and the hot air volume adjustment means 24 are interlocked so that they open and close in opposite directions.
．． The opening and closing operations of 24 may be controlled independently of each other. When such a completely independent control system is adopted, the blowout temperature characteristics can be further adjusted to suitably during the vent mode and the floor mode.

That is, in the vent mode (upper blowout temperature control), the cold air volume adjustment door 23 is fixed to be fully opened, and the hot air adjustment door 24 is adjusted steplessly to control the blowout temperature.
As a result, the upper blowout temperature characteristic has a gentle slope as shown in FIG. Since the cold air volume adjustment door 23 is always fully open, even if the hot air volume adjustment door 24 is fully opened, it will not reach the maximum blowout temperature for heater performance, unlike when the conventional air mix door is fully opened toward the heater core side. .

It is possible to suppress the blowout temperature from rising more than necessary during cooling. Especially in the vent mode, there is no need to raise the temperature extremely to the maximum blowout temperature of the heater performance, and the range from the highest to the lowest blowout temperature that is actually required is limited to a predetermined range, so this is not necessary. If the air outlet temperature can be finely adjusted within the range, the air outlet temperature can be controlled comfortably as desired by the occupants.

In addition, in the floor mode (lower blowout temperature control), the warm landscape adjustment door 24 is left fully open, and the cold air volume adjustment door 2 is kept fully open.
By steplessly adjusting 3, the amount of cold air can be adjusted by adjusting door 2.
Even when 3 is fully opened, the temperature does not drop to the maximum cooling temperature unlike when the conventional air mix door is fully opened to the cooling bypass passage side, and the lower blowout temperature characteristics are lower than 5.
Since the slope is gentle as shown in the figure, the blowout temperature can be finely adjusted within the required range, similarly to the above-mentioned vent mode.

FIG. 6 shows the internal structure of a heater unit used in another embodiment of the present invention, in which the same reference numerals as in the previously described embodiment indicate the same parts. The partition wall 10 that partitions the passage 8 and the second cold air passage 9 is provided with a communication port 50 that communicates both passages, and a cold air bypass damper 51 is attached to the communication port 5o.
is set to open only during maximum cooling, and by opening this door 51, cold air can be introduced from the first cold air passage 8 side to the second cold air passage 9 side through the communication port 50. So,! & The ventilation resistance during large-scale cooling can be further reduced, resulting in lower noise and lower power consumption of the blower motor.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to improve the air mixing performance of cold air and hot air while reducing ventilation resistance, and to perform highly accurate blowout temperature control. can be set in a position suitable for distributing the blowing air.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention. FIG. 2 is a schematic perspective view of the heater unit used in the above embodiment, FIG. 3 is a cross-sectional view showing a part of the heater unit, and FIG. 4 is the temperature adjustment door of the above embodiment. FIG. 5 is a characteristic diagram of outlet temperature versus opening degree of the temperature adjustment door in another embodiment of the present invention. FIG. 6 is a cross-sectional view of a heater unit used in another embodiment of the present invention. It is. DESCRIPTION OF SYMBOLS 1... Ventilation duct, 4... Air blower, 6... Heater unit, 8... First cold air passage, 9... Second cold air passage, 11... Heater core, 12 River heater chamber, 14
...Heater room outlet side passage (warm air passage), 15...Air mix space section, 18...Air conditioning mode outlet (vent outlet), 19...Heating mode outlet (floor outlet) outlet), 20... heater inlet, 21... heater outlet, 23... cold air volume adjustment means, 24... hot air (f adjustment means), 27... door opening/closing interlocking mechanism, 29...・Air volume door opening adjustment servo machine Tachibana, 51...Damper for cold air bypass. @ 3rd mouth 4th mouth 5th Il!]

Claims (1)

[Claims] 1. In the ventilation duct, a blower, a heater core that heats the cold air blown by the blower and converts it into warm air, and a cold air bypass passage that bypasses the cold air to the side of the heater core. In the air mix type air conditioner, the heater core is housed in a heater chamber defined in a part of the ventilation duct. , a first cold air passage and a second cold air passage are separately formed on the side of the heater chamber to separate the cold air passing through the ventilation duct, and the first cold air passage has its cold air inlet always open and the passage itself. communicates with the heater chamber, and on the other hand, the second cold air passage constitutes a cold air bypass passage for bypassing the cold air to the side of the heater chamber, and furthermore, an air mix is provided at the terminal side of the second cold air passage. forming a space, connecting an outlet side passage of the heater chamber to a side surface of the air mix space;
The warm air sent out from the heater chamber is set to join the cold air passing through the second cold air passage in the air mix space at right angles, and a cold air volume adjusting means is provided on the second cold air passage side. A hot air volume adjusting means is provided in each of the exit side passages of the heater chamber so that the proportion of cold air and hot air volume can be adjusted individually, and a cooling mode is provided near the air mix space of the second cold air passage. An air conditioner for an automobile, characterized in that an air conditioner is provided with a heating mode air outlet and a heating mode air outlet. 2. The air conditioner for an automobile according to claim 1, wherein the cold air volume adjusting means and the warm air volume adjusting means are air volume adjusting doors that open and close in opposite directions via an interlocking mechanism. 3. The air conditioner for an automobile according to claim 1, wherein the cold air volume adjusting means and the hot air volume adjusting means each include an air volume adjusting door that opens and closes independently. 4. In any one of claims 1 to 3, between the first cold air passage and the second cold air passage,
An air conditioner for an automobile comprising a damper that introduces cold air from the first cold air passage into the second cold air passage during maximum cooling.