JP2000103222A - Automobile air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set a temperature difference in air supplied out of a vent air outlet and a foot air outlet to proper value by which an occupant feels comfortable. SOLUTION: In this air conditioner, a foot air outlet 62 is positioned on the downstream side of a hot air passage 52, and a vent air outlet 61 is positioned on the downstream side of a cold air bypass passage 31, respectively. In this case, downstream air of the cold air bypass passage 31 is obliquely collided with air of the hot air passage 52 by the cold air guide surface 10a of a unit case 10 set at a prescribed inclination to the air outflow surface 50a of a heater core 50 to merge cold air and hot air. Thus, a temperature of the coil air flowing to the vent air outlet 61 is raised, and a temperature of the hot air flowing to the foot air outlet 62 is lowered to set a differnece in a blowout temperature from both air outlets 61, 62 to a proper value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for a vehicle, and more particularly to an air conditioner for a vehicle capable of obtaining good temperature control characteristics when a bi-level mode is selected.

[0002]

2. Description of the Related Art FIG. 4 is a conceptual view showing a conventional automotive air conditioner.

In this automotive air conditioner, an evaporator 230 for cooling air introduced into the unit case 210 by a fan 220, a heater core 250 for heating air passing through the evaporator 230, and an evaporator 230 A cool air bypass passage 231 formed downstream of
Air passing through evaporator 230 and heater core 250
Door 240 that regulates the proportion of air passing through
A vent outlet 261 located downstream of the cool air bypass passage 231, a warm air passage 252 formed downstream of the heater core 250, a foot outlet 262 located downstream of the hot air passage 252, and a vent outlet 262. An opening / closing door 260 that opens and closes the outlet 261 and the foot outlet 262 is provided.

When the bi-level mode is selected, the bypass door 240 rotates to an intermediate position, and the opening / closing door 260 moves to an intermediate position in the opening / closing direction.

[0005] The unit case 21 is
The air introduced into 0 passes through the evaporator 230 and then passes through the heater core 250. Evaporator 230
A portion of the air that has passed through the cool air bypass passage 231 does not pass through the heater core 250.

The air is cooled as it passes through evaporator 230 and is heated as it passes through heater core 250.

The air that has passed through the heater core 250 and the air that has not passed through the heater core 250 are blown out from a vent outlet 261 and a foot outlet 262.

The air downstream of the cool air bypass passage 231 and the air of the hot air passage 252 join together to form a vent outlet 26.
1 and the foot outlet 262, but the vent outlet 261 is located downstream of the cool air bypass passage 231, and the foot outlet 262 is located downstream of the warm air passage 252. Cold air is blown out from the mouth 261 and warm air is blown out from the foot outlet 262.

FIG. 5 is a conceptual diagram showing another conventional car air conditioner.

This vehicle air conditioner has substantially the same configuration as the vehicle air conditioner of FIG. 4 are denoted by the same reference numerals and the description thereof will be omitted.

The vent outlet 261 and the differential outlet 263 located downstream thereof are opened and closed by an opening / closing door 264.

When the bi-level mode is selected, the bypass door 240 rotates to the intermediate position, and the opening / closing door 260 rotates to the intermediate position in the rotation direction. Further, the opening / closing door 264 is rotated to the differential air outlet fully closed position indicated by the solid line.

The air inlet 310 of the unit case 310
The air introduced from b passes through the evaporator 230 and then passes through the heater core 250. Evaporator 230
A portion of the air that has passed through the cool air bypass passage 231 does not pass through the heater core 250.

The air that has passed through the heater core 250 and the air that has not passed through the heater core 250 are blown out from a vent outlet 261 and a foot outlet 262.

4, the vent outlet 261 is located downstream of the cool air bypass passage 231 and the foot outlet 262 is located downstream of the hot air passage 252. Cold air is blown from the outlet 261 and warm air is blown from the outlet 262 for the foot.

[0016]

As described above, when the bi-level mode is selected, in each of the automotive air conditioners, the cool air flows from the vent air outlet 261 and the cold air flows from the foot air outlet 26.
2, the warm air is blown out, respectively, but there is a problem that the temperature difference between the air blown out from both outlets 261 and 262 becomes too large and the comfort is impaired. That is, when the bi-level mode is selected, the air blown to the face is felt too cold, and the air blown to the feet is felt too warm.

Incidentally, in the above-described automotive air conditioner,
The temperature difference between the air blown out from the two blowout ports 261 and 262 becomes about 41 degrees (r ₂ ) (see FIG. 3).

The present invention has been made in view of such circumstances, and a problem thereof is to set a temperature difference between air vented from a vent outlet and a foot outlet to an appropriate value at which an occupant feels comfortable. It is an object of the present invention to provide an air conditioner for a vehicle that can perform the operation.

[0019]

According to a first aspect of the present invention, there is provided an air conditioner for a vehicle, comprising: a cooling heat exchanger for cooling air introduced into a unit case;
A heating heat exchanger that heats the air that has passed through the cooling heat exchanger; and a first heat regulator that adjusts a ratio of air that passes through the cooling heat exchanger and air that passes through the heating heat exchanger. An opening / closing door, a cold air bypass passage formed downstream of the cooling heat exchanger, a vent outlet located downstream of the cold air bypass passage, and a downstream opening of the heating heat exchanger. An automotive air conditioner including a warm air passage, a foot outlet located downstream of the warm air passage, and a second opening / closing door that opens and closes the vent outlet and the foot outlet. A cold air guide having a predetermined inclination angle with respect to an air outflow surface of the heating heat exchanger such that air downstream of the cold air bypass passage collides obliquely or substantially perpendicularly to air of the hot air passage. The surface of the unit case Characterized in that it is formed on the wall surface.

As described above, since the foot outlet is located downstream of the hot air passage and the vent outlet is located downstream of the cool air bypass passage, relatively cool air is supplied to the vent outlet. Although relatively warm air flows to the air outlet for each, the cold air guide surface having a predetermined inclination angle with respect to the air outflow surface of the heat exchanger for heating,
Since the air downstream of the cool air bypass passage collides obliquely or almost perpendicularly to the air in the warm air passage, and the cool air and the warm air merge, the temperature of the cool air flowing to the vent outlet increases,
The temperature of the warm air flowing to the foot outlet decreases, and the difference between the outlet temperatures from both outlets becomes smaller than in the conventional example.

According to a second aspect of the present invention, there is provided an air conditioner for an automobile according to the first aspect of the invention.
The heating heat exchanger is a hot water heat exchanger using hot water as a heat medium, one end of the hot water heat exchanger on the hot water inflow side is disposed near the foot outlet, and the other end is provided. A hot water supply amount adjusting means is provided near the cold air bypass passage and adjusts an amount of hot water supplied into the hot water heat exchanger.

As described above, one end of the heating heat exchanger on the hot water inflow side is located near the outlet for the foot, and the other end is located near the cold air bypass passage. The rise in the temperature of the passing air can be suppressed.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a conceptual diagram showing a vehicle air conditioner according to a first embodiment of the present invention.

The unit case 10 of the vehicle air conditioner
Inside, from the upstream side to the downstream side, a fan 20, an evaporator (cooling heat exchanger) 30, a heater core (heating heat exchanger) 50, a bypass door (first opening and closing door) 40, and an opening and closing door (second Opening / closing door) 60 is disposed.

The evaporator 30 is a heat exchanger for cooling the air sent from the fan 20.

The evaporator 30 is disposed so as to block the entire passage in the unit case 10.
All of the air introduced therein passes through the evaporator 30.

The heater core 50 is a hot water type heat exchanger using hot water as a heat medium, and heats the air passing through the evaporator 30. A pipe 81 for supplying hot water and a pipe 82 for discharging hot water are connected to the tank 50b of the heater core 50. In the middle of the pipe 81, the heater core 50
A water valve (hot water supply amount adjusting means) 51 for adjusting the supply amount of hot water to the inside is provided. As shown in FIG. 1, one end (tank 50b) of the heater core 50 on the side where warm water flows in is disposed near a foot outlet 62 described later, and the other end 50c is disposed at a vent outlet 6 described later.
1 is located near. The temperature at one end of the heater core 50 is higher than the temperature at the other end 50c because the temperature is on the side where warm water flows.

Downstream of the heater core 50, a warm air passage 52 through which warm air flows is formed. A cool air bypass passage 31 through which cool air flows is formed downstream of the bypass door 40.

The bypass door 40 is a door for adjusting the ratio of air passing through the heater core 50 and air not passing therethrough, and is provided in the middle of the cool air bypass passage 31. The bypass door 40 rotates between a fully open position indicated by a solid line (a position where the cool air bypass passage 31 is opened) and a fully closed position indicated by a two-dot chain line (a position where the cool air bypass passage 31 is shut off).

A vent outlet 61 and a foot outlet 62 are formed in the unit case 10. The vent outlet 61 is located downstream of the cool air bypass passage 31, and the foot outlet 62 is located in the warm air passage 52. Each is located downstream.

The inner wall surface of the unit case 10 has a predetermined inclination with respect to the air outflow surface 50a of the heater core 50 so that air downstream of the cool air bypass passage 31 collides obliquely with air in the hot air passage 52. A cold air guide surface 10a set at an angle is formed.

The opening / closing door 60 is provided between a vent outlet 61 and a foot outlet 62. The opening / closing door 60 has a vent outlet fully closed position indicated by a two-dot chain line (a position at which the vent outlet 61 is shut off) and a foot outlet fully closed position indicated by a one-dot chain line (a foot outlet 62 is shut off). Position). Ducts (not shown) are connected to the outlets 61 and 62, respectively.

The bypass door 40 has a water valve 51
The opening / closing door 60 opens and closes independently of the bypass door 40 in conjunction with the above operation.

Next, the operation of the automotive air conditioner will be described.

When the vent mode is selected by a mode change switch (not shown), the opening / closing door 60 is rotated to the position shown by the dashed line, the foot outlet 62 is shut off, and only the vent outlet 61 is opened. Also, the bypass door 40 rotates to the position shown by the solid line, and the cool air bypass passage 3
1 is opened, the water valve 51 is fully closed (cool) in conjunction with the operation of the bypass door 40, and the flow of warm water into the heater core 50 is stopped.
The heating function of 0 is gradually lost.

The air introduced into the unit case 10 by the rotation of the fan 20 is cooled when passing through the evaporator 30, and then flows through the cool air bypass passage 31 and the heater core 50 to the vent outlet 61. At this time, since warm water is not supplied into the heater core 50,
The air is not heated when passing through the heater core 50.
Therefore, cool air is blown into the vehicle interior from the vent outlet 61 through the duct.

When the foot mode is selected by the mode changeover switch, the bypass door 40 rotates to the position indicated by the two-dot chain line, the cold air bypass passage 31 is shut off, and the opening / closing door 60 rotates to the position indicated by the two-dot chain line. I do. Also,
In conjunction with the operation of the bypass door 40, the water valve 5
1 is fully opened (hot), and the tank 50 b is connected via the pipe 81.
(Heater core 50) is supplied with warm water.
The heating function is fully exhibited.

Since the cool air bypass passage 31 is blocked by the bypass door 40, all of the air that has passed through the evaporator 30 passes through the heater core 50, and the warm air passage 5
The air flows to the foot outlet 62 through the air outlet 2. Therefore, warm air is blown into the vehicle cabin from the foot outlet 62 through the duct.

When the bi-level mode is selected by the mode changeover switch, the opening / closing door 60 rotates to the position indicated by the solid line (an intermediate position between the position indicated by the two-dot chain line and the position indicated by the one-dot chain line). The bypass door 40 is in a half-open position (an intermediate position between the position indicated by the solid line and the position indicated by the two-dot chain line).
And the cold air bypass passage 31 is half opened, and the water valve 51 is half opened (intermediate position between cool and hot) in conjunction with the operation of the bypass door 40.
Then, hot water is supplied to the heater core 50 and the heater core 50
The heating function is exhibited.

After passing through the evaporator 30, the air passes through the heater core 50 and then travels through the hot air passage 52. Since the cool air bypass passage 31 is only half opened, a part of the air that has passed through the evaporator 30 is
Continue. Since the foot outlet 61 is located downstream of the hot air passage 52 and the vent outlet 61 is located downstream of the cool air bypass passage 31, cold air is supplied to the vent outlet 61 and to the foot outlet 62. The warm air flows in each.

However, the air outflow surface 50 of the heater core 50
The air downstream of the cool air bypass passage 31 is heated by the cool air
The air collides obliquely with the air, and the cold air and the hot air merge, so that the temperature of the cold air flowing to the vent outlet 61 rises and the temperature of the hot air flowing to the foot outlet 62 as compared with the conventional example. Goes down. As a result, as shown in FIG. 3, the difference between the outlet temperatures from both outlets 61 and 62 is smaller than in the conventional example. FIG. 3 is a graph showing a temperature control characteristic when the bilevel mode is selected. The vertical axis indicates the outlet temperature, and the horizontal axis indicates the positions of the bypass door 40 and the water valve 51. A dotted line indicates a conventional example, and a solid line indicates the present embodiment. r ₁ indicates the difference between the two outlet temperatures in the present embodiment, and r ₂ indicates the difference between the two outlet temperatures in the conventional example.

According to this embodiment, each outlet 61,
It is possible to make the difference between the blowout temperatures of 62 an appropriate value, and it is possible to obtain comfort when the bilevel mode is selected. In this embodiment, the difference between the outlet temperatures of the outlets 61 and 62 is from about 41 degrees (r ₂ ) to about 20 degrees (r ₁ ) (see FIG. 3), which is an ideal for the occupant to feel comfortable. Temperature difference (about 20 to 25 degrees).

Since one end (tank 50b) of the heater core 50 on the hot water inflow side is arranged near the foot outlet 62 and the other end 50c is arranged near the cool air bypass passage 31, the cool air bypass is provided. An increase in the temperature of the air passing through the passage 31 can be suppressed.

Further, since the bypass door is used as the first opening / closing door, the size of the unit case 10 can be reduced as compared with the case where an air mix door is used.

FIG. 2 is a conceptual diagram showing an automotive air conditioner according to a second embodiment of the present invention. Parts common to the first embodiment are denoted by the same reference numerals, and description thereof is omitted. However, illustration of the tank 50b, the water valve 51, and the like is omitted.

In the vehicle air conditioner of the second embodiment, the differential outlet 63 and the foot outlet 62 located downstream thereof are opened and closed by an opening / closing door 64.

When the bi-level mode is selected, the opening / closing door 60 rotates to the position indicated by the solid line, and the opening / closing door 64 rotates to the foot outlet fully open position indicated by the solid line. Further, the bypass door 40 is rotated to the half-open position (an intermediate position between the position indicated by the solid line and the position indicated by the two-dot chain line), so that the cool air bypass passage 31 is half opened, and in conjunction with the operation of the bypass door 40. When the water valve 51 is opened halfway (an intermediate position between cool and hot), the heater core 5
The warm water to 0 is supplied, and the heating function of the heater core 50 is exhibited.

The air inlet 110 of the unit case 110
The air introduced from (b) passes through the evaporator 30, passes through the heater core 50, and proceeds through the hot air passage 52. Part of the air that has passed through the evaporator 30 is
Without passing through the cold air bypass passage 31.

Since the vent outlet 61 is located downstream of the cool air bypass passage 31 and the foot outlet is located downstream of the hot air passage, as in the automotive air conditioner of the first embodiment, the vent vent 61 The cool air flows to the air outlet 61 and the warm air flows to the air outlet 62 for the foot.

However, the air outflow surface 50 of the heater core 50
The air downstream of the cool air bypass passage 31 is heated by the cool air
The air collides obliquely with the air, and the cold air and the hot air merge, so that the temperature of the cold air flowing to the vent outlet 61 rises and the temperature of the hot air flowing to the foot outlet 62 as compared with the conventional example. Goes down. As a result, both outlets 61, 6
The difference between the blowout temperatures from No. 2 is smaller than in the conventional example.

According to the second embodiment, the same effects as those of the first embodiment can be obtained.

In each of the above embodiments, the cold air guide surfaces 10a and 110a are connected to the air outflow surface 50a of the heater core 50.
Although the case where it is inclined by a predetermined angle with respect to
In order that the air downstream of the cool air bypass passage 31 can collide with the air of the warm air passage 52 almost at right angles,
The cool air guide surfaces 10a and 110a may be substantially parallel to the air outflow surface 50a of the heater core 50.

In the first embodiment described above, the case where a hot water heat exchanger (heater core 50) using hot water as a heat medium is used as the heat exchanger for heating is used. Various heat exchangers for heating, such as a heat exchanger using a heat medium, may be used.

Further, in each of the above-described embodiments, the case where the bypass door 40 is used as the first opening / closing door has been described. However, instead of the bypass door 40, air that shuts off the upstream of the heater core 50 when the cooling mode is selected. A mixed door may be used.

[0056]

As described above, according to the automotive air conditioner of the first aspect of the present invention, the difference between the outlet temperature of the vent and the outlet of the foot can be made an appropriate value, and when the bi-level mode is selected. Comfort can be obtained.

According to the vehicle air conditioner of the second aspect of the present invention, one end of the heater core on the hot water inflow side is arranged near the foot air outlet, and the other end is arranged near the cold air bypass passage. In addition, it is possible to suppress an increase in the temperature of the air passing through the cool air bypass passage.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing an automotive air conditioner according to a first embodiment of the present invention.

FIG. 2 is a conceptual diagram showing an automotive air conditioner according to a second embodiment of the present invention.

FIG. 3 is a graph showing a temperature control characteristic when a bi-level mode is selected.

FIG. 4 is a conceptual diagram showing a conventional automotive air conditioner.

FIG. 5 is a conceptual diagram showing another conventional car air conditioner.

[Explanation of symbols]

 10, 110 Unit case 10a, 110a Cold air guide surface 30 Evaporator 31 Cold air bypass passage 40, 60 Door 50 Heater core 50a Air outflow surface 50b Tank 50c Other end 51 Water valve 52 Hot air passage 61 Vent outlet 62 Foot Outlet

Claims (2)

[Claims] 1. A cooling heat exchanger for cooling air introduced into a unit case, a heating heat exchanger for heating air passing through the cooling heat exchanger, and a cooling heat exchanger. A first opening / closing door for adjusting a ratio of passing air and air passing through the heating heat exchanger; a cold air bypass passage formed downstream of the cooling heat exchanger; A vent outlet located on the downstream side, a warm air passage formed downstream of the heating heat exchanger, a foot outlet located downstream of the warm air passage, and the vent outlet An automotive air conditioner comprising a second opening / closing door for opening and closing the foot outlet, wherein air downstream of the cold air bypass passage collides obliquely or substantially at right angles with air of the hot air passage. The heat exchange for heating Motor-vehicle air-conditioning system cold air guide surface having a predetermined inclination angle with respect to the air outflow surface of the vessel is characterized in that it is formed on the inner wall surface of the unit case. 2. The heating heat exchanger is a hot water heat exchanger using hot water as a heat medium, and one end of the hot water heat exchanger on the hot water inflow side is disposed near the foot outlet. The hot water supply amount adjusting means for adjusting an amount of hot water supplied into the hot water type heat exchanger, the other end portion being disposed near the cold air bypass passage. Automotive air conditioner.