JPH0478491B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to an air conditioner for an automobile, and in particular to an air conditioning system for an automobile that uses an air mix method that mixes hot air and cold air passing through a ventilation duct to blow temperature-controlled air into a vehicle interior. It concerns a harmonization device. [Prior Art] Conventional reheat air mix type air conditioners that are generally used as air conditioners for automobiles are disclosed in, for example, Japanese Patent Laid-Open No. 57-37008 and Japanese Patent Laid-open No. 58
As shown in Publication No. 221714, 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 between the heater core and the cold air bypass passage while adjusting the air volume according to the opening degree of the air mix door. 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. Such reheat air mix type air conditioners have advantages such as quick response of outlet temperature control and are not affected much by changes in engine speed, but the following points need improvement. 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, conventionally, a wind direction plate has been provided in the air mix section to promote the mixing of cold air and hot air. However, such air mix improvement means increase the ventilation resistance in the ventilation duct, which causes a decrease in the amount of air blown out and the generation of noise. In addition, conventional air conditioners distribute cold air between the heater core and the cold air bypass passage using a single air mix door, but in such an air mix system, the cold air flow between the heater core and the cold air bypass passage is distributed according to the opening degree of the air mix door. Due to the change in the inlet space, if the air mix door opening (cold air inlet) on the heater core side, where ventilation resistance is high, is small, cold air will be difficult to flow toward the heater core side, and will flow to the cold air bypass passage side, where ventilation resistance is low. There was a problem that the flow tends to be biased and it is difficult to control the blowing 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 air outlet temperature characteristics, can perform air outlet temperature control with high precision, and can set the outlet position of a ventilation duct to a position suitable for distributing the air outlet air. be. [Means for Solving the Problems] In order to achieve the above object, the present invention is configured as follows. In addition, for ease of understanding, the first
The description will be made with reference to the reference numerals of the embodiments shown in FIGS. That is, the present invention provides an air conditioner for an automobile in which a temperature control unit 6 is disposed downstream of an evaporator unit 1 that forms part of a ventilation duct, and this temperature control unit 6 is connected to the evaporator unit 1. The casing 7 includes first and second cold air passages 8 and 9, a heater chamber 12 with a heater core 11, a hot air passage 14, and an air mix space 15, with the first cold air passage 8 facing the engine room side. Second
A cold air passage 9 is located on the passenger compartment side, and these cold air passages 8 and 9 are separated by a wall 10 and arranged in a horizontal row.
A heater chamber 12 with a heater core 11 is arranged directly below the cold air passages 8 and 9, and a hot air passage 14, which is a passage on the downstream side of the heater chamber 12, is partitioned by walls 13 and 16 and arranged on the engine room side. At the same time, an air mix space 1 is provided at a position facing the vehicle interior where the hot air passage 14 and the second cold air passage 9 intersect at right angles.
5 is formed from the bottom to the top of the casing 7, this air mix space 15 and the second cold air passage 9 are adjacent to each other via the wall 16, and the bottom wall of the first cold air passage 8 is provided with the heater chamber 12 and the second cold air passage 9. A passage opening 20 that communicates with the wall 13 connects the heater chamber 12 and the hot air passage 14 with a passage opening 21 that communicates with the wall 13.
A passage opening 22 that connects the hot air passage 14 and the air mix space 15 to each other in the casing 7 is located at a position extending from the second cold air passage 9 to the air mix space 15 on the side wall of the casing 7 on the passenger compartment side.
Similarly, a floor outlet 19 is arranged at a position corresponding to the lower part of the air mix space 15 on the side wall of the vehicle compartment, so that the air flowing through the first cold air passage 8 passes through the heater core 11 and the hot air passage 14 to the air mix space. 15, the second cold air passage 9 has a passage structure that joins the flowing air orthogonally, and a hot air volume control door 24 is provided at the passage opening 21 of the hot air passage 14, and a cold air volume control door 24 is provided in the second cold air passage 9. A control door 23 is provided to control these doors 23, 24.
The air volume ratio of cold air and hot air can be adjusted individually, and the vent outlet 18 and floor outlet 1
At 9, heating and cooling mode switching doors 18 and 19 are provided. [Function] According to the present invention having such a configuration, when the doors 23 and 24 are in the intermediate opening range, the cold air passing through the duct 1 is directed to the first cold air passage 8 and the second cold air passage 9. The cold air on the second cold air passage 9 side bypasses the heater chamber 12 and is sent directly to the air mix space 15. On the other hand, the cold air on the first cold air passage 8 side is heated in the heater chamber 12 and then heated into warm air. Passage 1
4, the air changes direction from the engine room side to the passenger compartment side, flows into the air mix space 15, and joins the cold air in the second cold air passage 9 at right angles.
Cold air and hot air are sufficiently mixed, and air mix can be improved. Further, the temperature of the air blown into the vehicle interior is controlled by a door 24 provided in the hot air passage 14 downstream of the heater chamber 12 and a door 23 provided in the second cold air passage 9.
This will be done through individual coordination with When adjusting the air volume, the cold air inlet on the first cold air passage 8 side is kept open at all times so that sufficient hot air can flow into the heater core 11, which has a large ventilation resistance. A sufficient amount of hot air flows out into the outlet side passage of the air mixer space 1, and the amount of hot air always corresponds to the opening degree of the hot air volume adjustment means.
4. On the other hand, since the amount of cold air corresponding to the opening degree of the door 23 also flows into the second cold air passage 9 side, the cold air and the warm air are combined after appropriate air volume adjustment. Further, after the warm air and the cold air are air 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, cold air is blown out through the air distribution duct to the entire center of the vehicle interior, the driver's seat, and the passenger seat. By the way, the air distribution duct on the passenger seat side is installed with the flow direction opposite to that of the ventilation duct, so
Although the air distribution efficiency tends to be lower than that of the air distribution duct on the driver's seat side, in the present invention, the second cold air passage 9 and the air mix space 15 are arranged in parallel with the heater chamber 12, and the hot air passage 14 is located at the back of the air mix space 15 and is orthogonal to the second cold air passage 9 at the position of the air mix space 15. 15 or from the air mix space 15 to the second cold air passage 9, the total length of the ventilation duct can be significantly shortened.
8 in the center of the vehicle interior or close to the passenger seat,
It is possible to redirect the direction in which the air distribution duct on the passenger seat side is arranged relative to the air outlet 18 of the ventilation duct in a direction in which the air distribution flow is smooth, and the air distribution efficiency on the passenger seat side can be improved. 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, so it is possible to increase the maximum cooling air volume and reduce noise. [Embodiment] An embodiment of the present invention will be described based on FIGS. 1 to 4. 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 this embodiment, and FIG. 3 is a cross-sectional view showing the internal structure of the heater unit.
is a ventilation duct for 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; 4 is an outside air introduction part provided at one end of the ventilation duct 1;
A blower 5 blows air introduced from the outside air introduction part 2a or the inside air introduction part 2b into the ventilation duct 1;
6 is an evaporator that dehumidifies and cools the air passing through the ventilation duct 1 to produce cold air, and 6 is a temperature control unit that adjusts the cold air blown from the evaporator 5 to a predetermined blowing temperature and blows it into the passenger compartment. (hereinafter referred to as a heater unit). As shown in FIG. 2, in the heater unit 6, a heater chamber 12 for housing a heater core 11 is formed in the lower part of a casing 7, and a heater chamber 12 for housing a heater core 11 is formed in the upper part of the casing 7.
The partition wall 1 includes a first cold air passage 8 and a second cold air passage 9 that introduce and guide the cold air blown from the ventilation duct 1.
0, and these passages 8 and 9 are each independently arranged on the side of the heater chamber 12. The terminal end of the first cold air passage 8 is partitioned by a partition wall 13 of the casing 7, and the partition wall 13 is located in a common adjacent area of the first cold air passage 8 and the heater chamber 12.
A hot air passage 14 is defined through the second cold air passage 9, and an air mix space 15 is further defined at the end of the second cold air passage 9.
is arranged adjacent to the hot air passage 14 via the partition wall 16. This air mix space 15 has a space from the top to the bottom of the casing 7. Near the air mix space 15 of the second cold air passage 9, a defroster outlet 17 is arranged at the top, and a second A vent outlet 18 is arranged on one side of the cold air passage 9 near the center,
Floor outlet 1 is located at the bottom of the air mix space 15.
9 are arranged. Furthermore, a heater chamber 1 is provided on the lower surface of the first cold air passage 8.
A heater inlet 20 communicating with the heater chamber 12 and the hot air passage 1 is provided on the lower side of the partition wall 13.
The partition wall 16 is provided with a heater outlet 21 that communicates with the hot air passage 14 and the air mix space 15 of the second cold air passage 9.
is installed. With such a configuration, the heater unit 6 allows the cold air passing through the second cold air passage 9 to flow directly to the air mix space 15 side, while 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, is heated by the heater core 11, becomes hot air, passes through the heater outlet 21, the hot air passage 14, and enters the hot air outlet 22.
is blown out to the air mix space 15 side through
This hot air merges with the cold air in the second cold air passage 9 almost perpendicularly, and the mixed air after merging is selectively controlled from one of the defroster outlet 17, vent outlet 18, and floor outlet 19. It is something that is blown out. Although not shown in the schematic diagram of the heater unit in FIG. 2, there are a cold air volume adjustment door 23, a hot air volume adjustment door 24, a vent-defroster switching door 25, and a floor outlet opening/closing door 26 as shown in FIG. etc. are arranged. In FIG. 1, the heater unit 6 described above is shown.
It is divided into the state seen from the front (), the state seen as a cross section along the X-X line (), and the state seen as a cross section along the Y-Y line (). And as shown in FIG. 3, a cold air volume adjustment door 23 is arranged on the entrance side of the second cold air passage 9,
A hot air volume adjustment door 24 is disposed at the hot air outlet 22 of the hot air passage 14, and the hot air volume adjustment door 24 and the cold air volume adjustment door 23 are interlocked via a link mechanism 27 so that they open and close in opposite directions. possible to be connected. Also, as shown in state (), the second
The cold air passage 9 is provided with a vent-defroster switching door 25 that switches between the defroster outlet 17 and the vent outlet 18, and the floor outlet 19 is provided with an opening/closing door 26 that opens and closes the floor outlet 19. ing. 29 is a cold air volume adjustment door 23, a hot air volume adjustment door 2
4, a servo mechanism for controlling the opening; 30, an actuator for controlling vent-defroster switching; 31, an actuator for controlling opening and closing of the floor air outlet 19; and 32, 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 includes air volume control means,
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 is composed of 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 37a to 37d, a logic circuit 39, and mode switching solenoid valves 40a to 40d.
Latch type push button switch 38 operated by ~37d
The actuators 30, 31, and 32 are controlled by selectively on-off controlling the solenoid valves 40a to 40d through the logic circuit 39 and opening/closing of the corresponding one of the solenoid valves 40a to 40d. 3, 25, and 26 are switched and controlled. Actuators 30, 31, and 32 operate under negative pressure when the solenoid valve opens (uses negative pressure from the engine intake manifold)
Switching control is performed by atmospheric operation when the solenoid valve is closed. Table 1 shows the negative pressure operation table for each mode.

〔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 high-precision blowout temperature control. It can be set at 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 a 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... Heater chamber, 14...
Heater chamber outlet side passage (warm air passage), 15... Air mix space section, 18... Cooling mode outlet (vent outlet), 19... Heating mode outlet (floor outlet), 20... Heater inlet, 21... heater outlet,
23... Cold air volume adjustment means, 24... Hot air volume adjustment means,
27... Interlocking mechanism for door opening/closing, 29... Servo mechanism for adjusting air volume door opening degree, 51... Damper for cold air bypass.

Claims (1)

[Claims] 1. In an air conditioner for an automobile, a temperature control unit 6 is disposed downstream of the evaporator unit 1 which forms part of a ventilation duct, and this temperature control unit 6 is connected to the evaporator unit 1. Heater chamber 1 with connected first and second cold air passages 8 and 9 and heater core 11
2. Consists of a casing 7 equipped with a hot air passage 14 and an air mix space 15, with the first cold air passage 8 facing the engine room,
The second cold air passage 9 is located on the passenger compartment side, and these cold air passages 8 and 9 are partitioned by a wall 10 and arranged in parallel in a horizontal row, and the heater with the heater core 11 is installed directly below the cold air passages 8 and 9. The warm air passage 14 serves as a passage on the downstream side of the heater chamber 12.
is partitioned by walls 13 and 16 and arranged on the engine room side, and this hot air passage 14 and the second
The air mix space 15 is formed from the bottom to the top of the casing 7 at a position facing the passenger compartment side orthogonal to the cold air passage 9, and this air mix space 15 and the second cold air passage 9 are connected to the wall 1.
6, adjacent to the heater chamber 1 on the bottom wall of the first cold air passage 8;
A passage opening 20 communicates with the wall 13 between the heater chamber 12 and the hot air passage 14; a passage opening 21 communicates between the hot air passage 14 and the air mix space 15 with the wall 16; A passage opening 22 connects the air mix space 1 from the second cold air passage 9 in the side wall of the casing 7 on the passenger compartment side.
A vent outlet 18 is disposed at a position corresponding to the first cold air passage 8, and a floor outlet 19 is disposed at a position corresponding to the lower part of the air mix space 15 on the side wall of the vehicle compartment, so that the air flowing through the first cold air passage 8 is directed to the heater core. 11. The passage has a structure in which the air flowing through the second cold air passage 9 joins the air flowing through the second cold air passage 9 in the air mix space 15 through the hot air passage 14, and the passage opening 21 of the hot air passage 14 is provided with a hot air volume control device. A door 24 is provided with a cold air volume control door 23 in the second cold air passage 9.
3 and 24, the air volume ratio of cold air and warm air can be adjusted individually.Furthermore, the vent outlet 18 and the floor outlet 19 are provided with an air conditioning mode switching door 1.
An air conditioner characterized in that 8 and 19 are provided. 2. The air conditioner according to claim 1, wherein the heating and cooling mode switching doors 18 and 19 are configured to open and close in opposite directions via an interlocking mechanism. 3. The air conditioner according to claim 1, wherein the heating and cooling mode switching doors 18 and 19 are configured to open and close independently.