JPS6271716A - Air conditioner for car - Google Patents

Abstract

PURPOSE:To widen the width of selection of the air conditioning feeling by arranging a buttefly damper so as to open and close the warm-air flow-out passage of a heater core on the downstream part of the heater core, into an air flow passage. CONSTITUTION:When a temperature setting lever is at the COOL position, an air mixing damper 13 is at the (c)-position, and when the lever is at the WARM position, the damper is at the (a)-position. While, a temperature setting switch used in bi-level mode is installed onto the temperature setting lever, and the position of a buttefly damper 15 is changed stepwise in (f) (e) (d) in the bi-level mode. Therefore, the warm air which is supplied from a heater core 11 is switched stepwise by the butterfly damper 15, and the mixing perfor mance of the cold air which passes through a bypass passage 12 and the warm air which passes through the heater core 11 in a mixing chamber 14 is varied. Therefore, the blowing-out temperature difference between at a vent blow-out port 20 and a heat blow-out port 21 can be set at various values, and comfort ableness can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an air conditioner for an automobile that has an improved high-level mode in which air is blown simultaneously from upper and lower air outlets.

[One conventional technique] Conventionally, automotive air conditioners have been configured to be able to set a high-level mode that simultaneously blows air from the upper and lower air outlets in the vehicle interior during seasons when intermediate temperatures are required, such as in the spring and autumn seasons. Many automobile air conditioners are being used.

In the above high level mode, in order to improve the air conditioning feeling, the temperature of the downward (foot) blowing air is made higher than that of the general upward blowing air, so that a blowing air temperature distribution with vertical temperature differences is obtained. ing.

[Problem that the invention seeks to solve]

By the way, in conventional automotive air conditioners, the pie level mode can be broadly divided into the isothermal pie level mode, which blows air at the same temperature from both the upper and lower outlets, and the cold air high level mode, which creates a temperature difference between the upper and lower blowout air temperatures. However, the setting of the temperature difference between the upper and lower blown air has been determined in a certain pattern depending on the layout of each outlet and the shape of the guide for mixing hot air and cold air.

For this reason, when correcting the temperature difference between the upper and lower blown air in the high-level mode, modification is often difficult and costs increase. Therefore, an object of the present invention is to provide an air conditioner for an automobile that can control the temperature difference in pie level mode in multiple stages.

[Means for solving problems]

In order to achieve the above purpose, (al) air having an air intake port on one end side and at least a vent outlet that blows out toward the upper body of the occupant and a heat outlet that blows out toward the occupant's feet on the other end side; (bl) a blower provided in the air flow path; (c1) a heater core provided in the air flow path and heating the air blown by the blower; (d) a heater core provided in the air flow path; (e) a bypass passage that bypasses the heater core and allows cold air to pass through; and (e) adjust the air volume ratio of warm air heated by the heater core provided in the air flow passage and cold air passing through the bypass passage. and (f) a butterfly damper provided in the air flow path downstream of the heater core to open and close the hot air outflow passage of the heater core.

[Effect]

According to the above technical means, the air mix between the cold air flowing into the Ghent air outlet and the warm air heated by passing through the heater core can be changed by the opening degree of the butterfly damper in the pie level mode. , the temperature difference between the air blown out from the Ghent air outlet and the heat outlet can be set variously. In this case, the temperature of the blown air can be arbitrarily set by the opening degree of the air mix damper.

〔Example〕

The present invention will be described with reference to embodiments shown in the drawings. FIG. 1 shows a first embodiment, in which reference numeral 1 denotes an internal/external air switching box made of resin, which incorporates an internal/external air switching damper 2. This damper 2 allows an internal air intake port 3 and an external air intake port 4 to be connected to each other. It is designed to open and close by switching.

A blower 5 includes a blower casing 6 that is integrally assembled to the lower part of the inside/outside air switching box 1, a motor 7a, and a syringe blower b driven by the motor 7a. 8 is a case of a cooler unit, which has a built-in heat exchanger 9 for cooling. This heat exchanger 9 consists of a refrigerant evaporator of a refrigeration cycle with a compressor driven by an automobile engine. 1O is a case of a heater unit, which has a heating heat exchanger 11 built therein. This heat exchanger 1
1 consists of a heater core (hot water radiator) whose heat source is the cooling water of an automobile engine. This heater core is a water valveless type that allows hot water to flow at all times. Further, a bypass passage 12 is formed adjacent to the 1-tacoa 11, and an air mix damper 13 is further provided to adjust the ratio of the air volume of cold air passing through the bypass passage 12 and hot air passing through the heat exchanger 11. By adjusting the opening degree of this damper 13, the temperature of the air blown into the vehicle interior can be adjusted as desired. On the downstream side of the heater core 11, a butterfly damper 15 is provided, which has a rotation fulcrum 17 approximately in the vertical center of the heater core 11 in the figure, and has dampers symmetrical about the fulcrum 17.

Furthermore, this butterfly damper 15 is (d).

It can be set in three positions (e) and (f), and in the state (f), the outlet side air path of the heater core 11 is completely sealed by the guide 16 provided at the upper part of the heater core 11 in the figure. I can do it. Note that the inlet side ventilation path is also sealed by an air mix damper I3 that can be set at the position (c).

14 is an air mixing chamber for mixing cold air and hot air. Reference numeral 20 denotes a vent air outlet, which is connected via a three-way branch duct (not shown) to an upper air outlet (vent outlet) that blows air toward the upper body of the occupant. These upper air outlets are normally provided at three locations, one in the center of the upper part of the instrument panel of an automobile, and one on both left and right sides. Reference numeral 22 denotes a defroster air outlet, which is connected via a defroster duct (not shown) to a defroster outlet that blows air toward the front windshield of the automobile. This defroster outlet is usually provided at several locations on the top surface of the instrument panel and adjacent to the window glass. 2I is a lower outlet heater outlet that blows air toward the feet of the occupant, and is connected to the heater unit case 10.
The lower part of the door opens to the driver's seat side and the passenger seat side. The damper 18 opens and closes a passage including the heat outlet 21 and the defroster air outlet 22 and a passage including the 20 vent air outlets. The vent air outlet 23, the heat outlet 2I, and the defroster air outlet 22 are separated by partition plates 23 and 24, respectively. The damper 19 opens and closes the heat outlet 21 and the defroster air outlet 22. Next, the potentiometer 51 is connected to an air mix damper 13 which is linked to a temperature setting lever 62 of a control panel 60, which will be described later.
Detects the opening degree as an electrical signal and inputs it to the control circuit 52. Furthermore, a signal from a temperature difference setting switch 66, which will be described later, is also input to the control circuit 52. Therefore, in the control circuit 52,
Based on these signals, a damper position switching signal is output to the opening switching servo motor 53 to operate the damper 15 in a predetermined operating pattern. Note that 50 has an internal/external air intake port 3.4 at one end, and an air outlet (2) at the other end.
0, 21, 22).

FIG. 2 shows an air conditioning control panel 60 installed in or around the instrument panel of an automobile, where 61 is an inside/outside air switching lever, and the inside/outside air switching damper 2 is positioned at the outside air intake position shown by the solid line in FIG. 1. (FRESH) and the internal air intake position (RECIRC) shown by the dashed line in FIG. 62 is a temperature setting lever, air mix damper 13
The maximum cooling position (
c0OL) and the maximum heating position (
WARM> is continuously adjusted.

A temperature difference setting switch 66 used in the pie level mode is provided inside the temperature setting lever 62, and the switch 66 is turned on by pushing the lever 62. Reference numeral 63 denotes a blowout mode setting lever, which controls the opening and closing of the various dampers 18 and 19 shown in FIG. This is to set the blowout mode. That is, (11 vents (V B N T
)mode.

(2) Pie level (B/L) mode, (3) Heat (
HEAT) mode and (4) defroster (DBF) mode are set using the lever 63. In the high level mode, by pressing the temperature setting lever 62, the temperature difference setting switch 66 is turned on and the damper 15 is operated, so that a high level mode having an upper and lower temperature difference can be realized. A blower control lever 64 stops (OFF) the blower by controlling the energizing circuit to the fan drive motor 7a.

Low speed (Lo), medium speed (Me), and high speed (Hi) are set. Reference numeral 65 denotes a compressor operation switch called a general air conditioner switch, which cuts off and on the power supply to the electromagnetic clutch for the compressor of the refrigeration cycle, thereby turning on and off the operation of the compressor. Therefore, when this switch 65 is turned on to operate the compressor, a cooling effect is obtained by the cooling heat exchange 2v19. Next, the operation of this embodiment will be explained. When the lever 63 in FIG. 2 is operated to the vent (VENT) mode position, the damper 18 is operated to the one-dot chain line device (A) in FIG. 1, and only the vent air outlet 20 is opened. At this time, the heat outlet 21 and the defroster outlet 2
No air flows through 2.

Therefore, the air blown by the blower 5 passes through the cooler unit case 8, flows into the heater unit case 10, becomes air at an appropriate temperature determined by the opening degree of the air mix damper 13, and flows into the vent air outlet 20. The air is blown out from a vent outlet (not shown) toward the upper body of the occupant inside the vehicle to provide cooling or ventilation. In addition, in the vent mode, the cold air from the bypass path 12 and the heater core 11
The heated air is mixed in the air mixing chamber 14 located upstream of the vent air outlet 20.

Next, in the HEAT mode, the damper 18 is operated to the position (G) in FIG. position, the defroster air outlet 22 is closed and the heat outlet 21 is opened. Therefore, the cold air that has passed through the bypass passage 12 is mixed with the warm air in the air mixing chamber 14 to reach an appropriate temperature, and the warm air at the appropriate temperature is blown out from the heat outlet 21 to the feet of the occupant to provide a heating effect.

Next, in the defroster (DEF) mode, damper 1
8 is operated to the position (g) in FIG. The air mixed in the air mixing chamber 14 and brought to an appropriate temperature is blown out from a defroster outlet (not shown) toward the window glass to remove fog from the window glass.

Next, the pie level (B/L) mode, which is a feature of the present invention, will be described. First, in pie level mode, damper 1
8 is operated to the position (h) in Fig. 1, and damper 1 is
9 is operated to the (l) position and the vent air outlet 20 is opened.
and the heat outlet 21 are opened at the same time, and both of them 20.2
Air flows through 1 and blows out from the upper and lower outlets at the same time.

The movements of the dampers 18 and 19 in each mode have been shown above.

Next, the rotational relationship between the air mix damper 13 and the damper 15 will be explained. The opening degree of the air mix damper 13 is determined by a temperature setting lever shown at 32 in FIG. When the lever 32 is at the maximum cooling position (cOOL), the air mix damper 13 is operated to the position (c) in FIG. 1, and the temperature setting lever 62 is at the maximum heating position (WARM).
When , it is operated to position (a).

The operation pattern of the damper 15 by the temperature setting lever 62 is normally controlled by the control circuit 52 as shown in FIG. In Fig. 3, the position of the damper 15 is plotted on the vertical axis.
The horizontal axis represents the temperature setting lever position. That is, for the temperature setting lever 62, from CooL to WARM
When the damper 15 is moved slightly, the damper 15 suddenly changes from the fully closed position to the fully open position. In this operation pattern, since the damper 15 is in position (d) in almost the entire area including the middle part of the set temperature and excluding the vicinity of the maximum cooling position, the cold air that has passed through the bypass path 12 and the warm air that has passed through the heater core 11 and are sufficiently mixed in the mixing chamber 14, the vent outlet 20 and the heat outlet 2 are connected in the pie level mode.
1, the difference in temperature between the upper and lower sides of the blown air becomes smaller.

This corresponds to the temperature change pattern of the outlet temperature shown by the solid line in Figure 5.
．． This corresponds to 41. In FIG. 5, the vertical axis represents the blowout temperature, and the horizontal axis represents the temperature setting lever position. Next, when the temperature difference setting switch 66 provided on the temperature setting lever 62 of the control panel shown in FIG. 2 is turned on in the pie level mode, the operation pattern of the damper 15 is controlled as shown in FIG. 4. That is, the position of the damper 15 is (
to) 0 (e) ← (d).

In this case, the damper 15 is at the position (E) in the middle of the set temperature, so after passing through the heater 3 fan 11, the hot air flows to the damper 15.
The warm air is divided into two parts, and one of the warm air is sent to the heater outlet 21
The other hot air is mixed with the cold air that has passed through the bypass path 12 in the mixing chamber 1.
Since the air is mixed in step 4 and blown out from the vent outlet, the temperature difference between the upper and lower sides at the outlet becomes large. This corresponds to 44.4 of the outlet temperature change pattern shown by the dashed line in Figure 5.
It corresponds to 5.

By using the butterfly damper 15 as described above, two pie level modes with different upper and lower temperature differences can be obtained in the same air conditioning system. In addition, as a modification of this embodiment, the temperature setting lever 62 of the control panel 60 shown in FIG. 2 and the temperature difference setting switch 66 only for the by-bell mode are made integrally, but they may also be provided separately. good.

For example, as another modification, such as using the pie level display part of the mode setting lever 63 as a temperature difference setting switch, as shown in FIG. A pie level mode may be provided in which the temperature difference between the top and bottom can be set. In FIG. 6, the vertical axis shows the position of the damper 15, and the horizontal axis shows the position of the temperature setting lever 62. In addition to the existing pattern 42, a new pattern 43 is provided in five stages. In this case, a temperature difference setting switch 67 is provided around the temperature setting lever 62 of the control panel 60 as shown in FIG. In addition, the air mix damper 13 and the damper 15
A similar effect can be obtained by operating each independently.

FIG. 8 shows a second embodiment, in which the air mix damper 13 in FIG. 1 is divided into two dampers 30 and 31, a partition plate is provided between the dampers 30 and 31, and the heater core 11 is The butterfly damper 15 installed approximately in the center of the passage 50 and downstream of the heater core 11 is connected to the fulcrum 1.
The butterfly damper 33 has an asymmetric shape when viewed from the side, and a guide 34 is added near the heater core 11 and the butterfly damper 33. When the heater core 11 is operated to the position 1), the hot air outlet of the heater core 11 is completely closed by the butterfly damper 33 and the guide 34. Also, instead of the mode switching damper 18, a butterfly-shaped damper 35,
36 were established.

Here, the air mix damper 30.31 is connected to the interlocking mechanism 46.
The butterfly damper 33 is also controlled by an interlocking mechanism 46 having a control circuit 52 to set the damper position in a plurality of stages. The blowout mode switching dampers 19, 35, and 36 are operated by the interlocking mechanism 47 according to the setting mode of the blowout mode setting lever 63. In the configuration of the second embodiment as well, it is possible to provide a pie level mode that can be set in a plurality of stages depending on the difference in upper and lower temperatures, as in the first embodiment.

In addition, the above-mentioned 1. In the second embodiment, the case where the Tara unit case 8 containing the cooling heat exchanger 9 is provided on the upstream side of the heater unit case 10 has been described. It goes without saying that the present invention can be similarly implemented in an automobile air conditioner provided with a connecting duct.

Next, in the second embodiment, by replacing some parts, it is possible to share the upper and lower independent temperature control systems. Figure 9 shows the upper and lower independent temperature control system. As for the configuration, the content of the change from FIG. 8 to FIG. 9 is to change the butterfly damper 33 to a single damper 38. Next, of the three locations of the guide 34, two locations on the damper 33 side are eliminated, and the remaining one location is shortened to match the case of the heater core 11. Further, the partition plate between the vent air outlet 20 and the heat outlet 21 is extended to the fulcrum 17 of the damper 38. Another difference is the change in the interlocking mechanism due to the difference in damper connection.

FIG. 2 shows a control panel 70 that is assembled into the driver's instrument panel. Reference numeral 71 denotes a temperature setting lever on the upper side (FACE) for rotating the air mix damper 30 for adjusting the temperature of the vent outlet air of one air conditioning ventilation passage 50a, and 72 indicates a temperature setting lever on the upper side (FACE) for adjusting the vent outlet air temperature of one air conditioning ventilation passage 50a. The lower side (F
OOT) The temperature setting lever has a C00L mark on the left end of the guide groove 71a of the upper temperature setting lever 71, a WARM mark near the right end, and an OFF mark on the rightmost end.
marked. Further, WARM is located at the right end of the guide groove 72a of the lower temperature setting lever 72, and C near the left end.
A 00L mark is attached, and an OFF mark is attached to the leftmost end. A defrost lever 73 rotates the defrost damper 19 to control the amount of air discharged from the defrost outlet 22.

Other mechanisms are similar to control panel 60. As shown in FIG. 9, the damper connection method is such that in the upper passage 50a of the air conditioning ventilation passage 50, the movement of the upper temperature setting lever 71 is transmitted by the interlocking mechanism 48, and the movement of the upper temperature setting lever 71 is transmitted to the air mix damper 30, damper 38, and GENT air outlet. A switching damper 35 is interlocked. Lower passage 50b of air conditioning ventilation passage 50
Also, the movement of the lower temperature setting lever 72 is transmitted by the interlocking mechanism 49, and the air mix damper 31 and the heat outlet switching damper 36 are interlocked. For example, when the upper passage 5Qa is being cooled to its maximum, that is, when the upper temperature setting lever 71 is at the C00L position, the damper 38 is set to the position (a) in FIG. 9 to prevent hot air from leaking downstream of the heater core 11. When the upper temperature setting lever 71 is located at the intermediate position, the damper 38 is operated as shown in FIG.
(b) position. Upper temperature setting lever 71 is O
When located at FF, the blowout air intake port switching damper closes the blowout port and no air flows, but at this time, in the downstream passage 50b, in order to fully utilize the ability of the heater core 11 at maximum heating, the damper 38 is switched again as shown in FIG. It operates to position (a).

The positional relationship between the above-mentioned upper temperature setting lever 71 and the damper 38 is graphed as shown in FIG. Lower passage 50
The same is true in case b except that there is no damper 38, and air mixing is performed using the portion of the heater core 11 existing in the lower passage 50b at the intermediate portion of the lower temperature setting lever 72. When the lower temperature setting lever 72 is OFF, the passage is closed by the blowout air outlet switching damper and no air flows. Further, the temperature of the defrost air outlet 22 is controlled in the same way as the heat outlet 21 by switching the damper 19. By slightly changing the configuration in this way, it is possible to realize upper and lower independent temperature control in which the air outlet temperature in the vehicle interior can be controlled independently for the upper and lower sides. This is very useful because it can meet the two needs of segmentation of the pie level mode and independent upper and lower temperature control with a slight change in configuration.

By the way, the heater core 11 in Embodiment 1.2 is a heater core without a water valve, in which hot water, which is engine cooling water, is constantly flowing. May be used. Furthermore, the interlocking mechanism described in the present invention may include various mechanisms such as one using a link mechanism, one using a servo motor controlled by the control circuit 52, and one using a diaphragm.

〔Effect of the invention〕

As detailed above, according to the present invention, the pie level mode can be finely controlled from the high level mode with a small temperature difference to the high level mode with a large temperature difference by giving temperature differences to the upper and lower blown air in multiple stages. This allows for a wider range of options for air conditioning feel depending on the passenger's preferences, making it possible to achieve even more comfortable air conditioning operation.

[Brief explanation of drawings]

1 is a schematic side sectional view including a circuit diagram showing a first embodiment of the device of the present invention, FIG. 2 is a front view of the control panel of the device shown in FIG. 1, and FIG. , FIGS. 4 and 6 are graphs showing the interlocking relationship between the temperature setting lever 62 position and the damper 15 position, and FIG. 5 is a graph showing the relationship between the temperature setting lever 62 position and the blowing temperature in pie level mode. FIG. 7 is a diagram showing the relationship in the form of a graph, FIG. 7 is a diagram showing another example of the vicinity of the temperature setting lever 62 on the control panel 60, and FIG. 8 is a diagram showing the interlocking relationship between the second embodiment of the present invention and the damper. A schematic side sectional view including;
FIG. 9 is a schematic side sectional view including the interlocking relationship between the third embodiment of the present invention and the damper; FIG. 10 is a graph showing the interlocking relationship between the position of the temperature setting lever and the damper; FIG. 11 is a front view of the control panel of FIG. 9. 3... Inside air intake, 4... Outside air intake, 3.4...
・Air intake port, 5...Blower, 11...Heater core, 12...Hihas! , 13... Air mix damper, 15... Butterfly damper, 20... Vent outlet, 21... Heat outlet, 50... Air flow path.

Claims (1)

[Claims] (a) Air having an air intake port on one end side and at least a vent outlet that blows out toward the upper body of the occupant and a heat outlet that blows out toward the occupant's feet at the other end. (b) a blower provided within the air flow path; (c) a heater core provided within the air flow path and heating air blown by the blower; (d) within the air flow path. (e) a bypass passage provided in the air flow passage that bypasses the heater core and allows cold air to pass through; (f) a butterfly damper provided in the air flow path at a downstream portion of the heater core to open and close a hot air outflow passage of the heater core. air conditioning equipment.