JP2001163027A - Air conditioner for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner for a small automobile with superior heating performance and cooling performance. SOLUTION: In this air conditioner for an automobile, which is provided with a blower 10, an evaporator 30, a heater core 40, an air mixing door 50, a unit case 60 for accommodating them, a cool air bypass passage 66 where the air having passed through the heater core 40 flows, and an air mixing space 67 where the air at the downstream of the cool air bypass passage 65 and the air at the downstream of a hot air passage 66 are mixed, and where the blower 10 is located at an upper side in the vertical direction of a vehicle, of the evaporator 30, the evaporator 30 is located at a front side in the longitudinal direction of the vehicle, of the heater core 40, and the air mixing space 67 is located at the downstream of the air mixing door 50, the unit case 60 is provided with a passage 5 for partially guiding the air in the air mixing space 67 to the upstream of the blower 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called blower-integrated automotive air conditioner in which a blower, an evaporator and a heater core are housed in a single unit case.

[0002]

2. Description of the Related Art Conventionally, this type of vehicle air conditioner has a blower, an evaporator for cooling air from the blower, a heater core for heating the air from the evaporator, and air passing through the heater core. It has an air mix door that adjusts the proportion of air and a single unit case that houses them.

[0003] The blower is located above the evaporator in the vehicle vertical direction. The blower has a scroll fan having a rotation axis parallel to the vehicle left-right direction, and a motor for driving the fan. The evaporator is located in front of the heater core in the vehicle longitudinal direction.

[0004] Inside the unit case, a cool air bypass passage through which the air passing through the evaporator flows, a hot air passage through which the air passing through the heater core flows, air downstream of the cool air bypass passage, and air downstream of the hot air passage. A mixed air mix space is formed.

[0005] The aermic space is located downstream of the air mix door. In the unit case, a differential blowing opening, a vent blowing opening, and a foot blowing opening are formed downstream of the air mix space.

When the blower is activated, air is introduced into the unit case and travels through the air guideway to the evaporator.

[0007] At the time of full cooling, the air that has passed through the evaporator passes through the cool air bypass passage to the air mixing space. As the air passes through the evaporator, it is cooled and blown out from the selected blowout opening toward the passenger compartment.

At the time of full hot, the air that has passed through the evaporator goes to the heater core. The air that has passed through the heater core passes through the warm air passage to the air mix space. When the air passes through the heater core, the air is heated and blown out from the selected blowout opening into the vehicle interior.

At the time of air mixing, a part of the air that has passed through the evaporator passes through the cool air bypass passage to the air mixing space. The rest of the air in the cool air bypass passage goes to the heater core.

[0010] The air passing through the heater core passes through the warm air passage to the air mix space. As the air passes through the heater core, it is heated.

The air downstream of the cool air bypass passage and the air downstream of the warm air passage merge and mix in the air mix space, and are blown out from the selected blow-out opening to the vehicle compartment side.

[0012]

In recent years, downsizing of air conditioners for automobiles has been required, and accommodating an evaporator and a heater core in a small unit case has become a major technical theme.

However, if the evaporator or the like is simply miniaturized in accordance with the miniaturization of the unit case, there is a problem that the heating performance and the cooling performance are reduced.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a small-sized vehicle air conditioner excellent in heating performance and cooling performance.

[0015]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problem, the invention according to claim 1 comprises a blower, a cooling heat exchanger for cooling air from the blower, and a cooling heat exchanger for cooling the air from the cooling heat exchanger. A heating heat exchanger for heating the air, an air mix door for adjusting the ratio of air passing through the heating heat exchanger and air not passing therethrough, a unit case accommodating them, and the cooling heat exchanger A cold air bypass passage through which the air that has passed through, a hot air passage through which the air that has passed through the heating heat exchanger flows, and air in which air downstream of the cold air bypass passage and air downstream of the hot air passage are mixed. And a mixing space, wherein the blower is located above the cooling heat exchanger in the vehicle vertical direction, the cooling heat exchanger is located in front of the heating heat exchanger in the vehicle longitudinal direction, and the aermic space is Said In automotive air conditioning device positioned downstream of Amikkusu door passage for introducing a part of air in the air mixing space the blower upstream, characterized in that provided in the unit case.

A part of the air introduced into the air mixing space is returned to the upstream of the blower, and passes through the heating heat exchanger or the cooling heat exchanger again. The temperature of the air that passes through the heating heat exchanger and is guided into the air mix space increases, and the temperature of the air that passes through the cooling heat exchanger and is guided into the air mix space decreases.

According to a second aspect of the present invention, in the vehicle air conditioner according to the first aspect, a differential blow opening, a vent blow opening, and a differential blow opening formed in the unit case and formed downstream of the air mix space. An opening for the foot outlet,
An opening / closing door that opens and closes these openings, and a door that is provided in a vent passage and a foot passage downstream of the opening and closing door and that can open and close the vent passage and the foot passage at a constant cycle are provided. .

When the door is closed during cooling, the air circulates in the unit case and is cooled by the cooling heat exchanger. When the door is opened, the cooled air flows out of the unit case through the selected blowing opening. It is blown out to. on the other hand,
When the door is closed during heating, the air circulates inside the unit case and is heated by the heat exchanger for heating.When the door is opened, the heated air is blown out of the unit case through the selected blowing opening. You.

[0019]

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

FIG. 1 is a longitudinal sectional view showing an automotive air conditioner according to an embodiment of the present invention, FIG. 2 (a) is a view taken in the direction of arrow A in FIG. 1, and FIG. 2 (b) is an automotive air conditioner shown in FIG. It is a perspective view of an apparatus.

The automotive air conditioner comprises a blower 10 and
A filter 20 for removing dust in the air sucked into the blower 10, an evaporator (cooling heat exchanger) 30 for cooling the air passing through the filter 20, and a heater core (heater for heating the air from the evaporator 30) A heating heat exchanger) 40, an air mix door 50 for adjusting the ratio of air passing through the heater core 40 to air not passing therethrough, and a single unit case 60 accommodating them.

The blower 10 is located above the evaporator 30 in the vehicle vertical direction V. An intake box (not shown) is connected to the connection portion 11 of the blower 10.

The blower 10 includes a scroll fan 12 having a rotation axis (not shown) parallel to the vehicle left-right direction RL,
It has a motor 13 for driving the scroll fan 12 and a casing 14 for accommodating the scroll fan 12. The casing part 14 forms a part of the unit case 60.

The filter 20 is arranged near the upstream end face 31 of the evaporator 30 and in parallel with the upstream end face 31.

The evaporator 30 is located on the front side of the heater core 40 in the vehicle longitudinal direction H. The evaporator 30 is inclined by a predetermined angle with respect to a vertical plane.

An air mix door 50 is disposed above the heater core 40 in the vehicle vertical direction V. The air mix door 50 is bent and can rotate about the rotation shaft 51.

The unit case 60 can be divided in the vehicle left-right direction RL, and after being accommodated with the evaporator 30 and the like, is united by screws or clips (not shown). The unit case 60 is provided with a differential blowing opening 61, a vent blowing opening 62, and a foot blowing opening 63. The unit case 60 has a drain port 64 for discharging condensed water flowing down from the evaporator 30 to the outside.

In the unit case 60, a cool air bypass passage 65 through which the air passing through the evaporator 30 flows,
Warm air passage 66 through which air passing through heater core 40 flows
And the air downstream of the cold air bypass passage 65 and the hot air passage 66
And an air mix space 67 in which the air is mixed.

The air mix space 67 is located downstream of the air mix door 50. Downstream of the air mix space 67, a differential blowing opening 61, a vent blowing opening 62, and a foot blowing opening 63 are located. Differential blowing opening 61,
Ducts (not shown) are connected to the vent outlet opening 62 and the foot outlet opening 63, respectively.

Further, downstream of the air mix space 67,
The passage 5 for guiding a part of the air in the air mix space 67 to the upstream of the blower 10 is provided. The passage 5 is formed by a passage member 15 (described later) that connects the two holes 19a and 19b formed in the connection portion 11 between the unit case 60 and the blower 10. The connection part 11 is a blower 1
0 of the casing portion 14.

Downstream of the air mix space 67 in the unit case 60, mode switching doors 68, 69 are rotatably provided. V-direction V of mode switching door 68
A mode switching door 69 is located above the right side. The mode switching doors 68 and 69 are operated by a link mechanism (not shown), and a blowing mode is determined.

The foot passage 7 downstream of the mode switching door 68
0 is provided with a butterfly door (door) 71. The butterfly door 71 is rotatable about a rotation shaft 71a, and opens and closes the foot passage 70 at a constant cycle.

In the vent passage 72 downstream of the mode switching door 69, a butterfly door (door) 73 that opens and closes the vent passage 72 at a constant period is provided. The butterfly door 73 is rotatable about a rotation shaft 73a, and opens and closes the vent passage 72 at regular intervals.

FIG. 3 is a perspective view showing an example of the passage member.

The passage member 15 includes an air guide 16 having a U-shaped cross section and flanges 17 and 18 formed at both ends of the air guide 16.

The passage member 15 is mounted between a hole 19a formed in the unit case 60 and a hole 19b formed in the connection portion 11 of the blower 10. At this time, the passage member 15
The flange 17 is fitted into the hole 19a and the flange 18 is fitted into the hole 19b, so that the internal space of the air guide 16 and the holes 19a and 19b are aligned.

As a result, the passage 5 for guiding a part of the air downstream of the air mix space 67 to the upstream of the blower 10 is formed by the passage member 1.
5 formed.

FIG. 4 is a diagram showing the timing for opening and closing the butterfly door.

The butterfly door 71 opens and closes the foot passage 70 at a duty cycle of 50%.

The butterfly door 73 opens and closes the vent passage 72 at the same duty cycle as that of the butterfly door 71.

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

At the time of full cooling, the air mix door 50 rotates to the position shown by the solid line, and the upstream side of the heater core 40 is closed.

The air introduced into the casing 14 of the blower 10 passes through the air guide passage 9 to the filter 20. As the air passes through the filter 20, dust in the air is removed. The air is cooled when passing through the evaporator 30.

The air that has passed through the evaporator 30 passes through the cool air bypass passage 65 toward the air mixing space 67.

A part of the air is introduced from the downstream of the air mixing space 67 to the casing section 14 again through the passage 5 and further cooled when passing through the evaporator 30.

When the mode switching doors 68 and 69 are at the positions indicated by the solid lines in FIG. 1, the cooled air passes through the cool air bypass passage 65 and the vent passage 72 and the vent outlet opening 6.
2 is blown out to the cabin side.

At this time, since the rotating butterfly door 73 opens and closes the vent outlet opening 62 in the cycle shown in FIG. 4, the cooled air passing through the evaporator 30 a plurality of times periodically flows from the vent outlet opening 62. It is blown out to the cabin side.

At the time of full hot, the air mix door 50
By rotating to the position shown by the dashed line, the upstream side of the heater core 40 is opened.

At this time, since the cool air bypass passage 65 is shut off by the air mixing door 50, all the cool air that has passed through the evaporator 30 is guided to the heater core 40.

The air guided to the heater core 40 is heated.

The air that has passed through the heater core 40 passes through the hot air passage 66 to the air mixing space 67.

A part of the air is guided again from the downstream of the air mix space 67 to the casing section 14 through the passage 5 and further heated when passing through the heater core 40.

When the mode switching door 68 is at the position shown by the two-dot chain line in FIG.
Through the foot passage 70, the air is blown out from the foot blow-out opening 63 toward the passenger compartment.

At this time, since the rotating butterfly door 71 opens and closes the foot outlet opening 63 in the cycle shown in FIG. 4, air heated to a predetermined temperature through the heater core 40 a plurality of times passes through the foot outlet opening 63. It is periodically blown out to the passenger compartment side.

In the bi-level mode, the air mixing door 5
0 is located between the position shown by the solid line and the position shown by the two-dot chain line, the mode switching door 68 is located between the position shown by the solid line and the position shown by the two-dot chain line, and the mode switching door 69 is placed by the solid line. In the position shown.

A part of the air that has passed through the evaporator 30 passes through the cool air bypass passage 65 and passes through the air mixing space 6.
7 and the rest toward the heater core 40.

The air that has passed through the heater core 40 travels through the warm air passage 66 to the air mixing space 67. As the air passes through the heater core 40, it is heated.

The air downstream of the cool air bypass passage 65 and the air downstream of the hot air passage 66 are joined and mixed in an air mixing space 67, and are blown out from the vent outlet opening 62 and the foot outlet opening 63 toward the passenger compartment. Is done.

A part of the air guided to the air mix space 67 is again guided to the casing section 14 through the passage 5, mixed with the air newly introduced into the casing section 14, and sent to the evaporator 30 again. .

When air is blown out from the vent blowout opening 62 and the foot blowout opening 63, the rotating butterfly door 71 opens and closes the foot blowout opening 63 at the cycle shown in FIG. 4, and the butterfly door 73 moves as shown in FIG. Since the vent outlet opening 62 is opened and closed at the indicated cycle, the vent outlet opening 62 is opened and closed.
, And a warm air of a predetermined temperature is periodically blown out from the foot blow opening 63 to the vehicle compartment side.

According to this embodiment, the following effects can be obtained.

During heating, the blowout temperature is not reduced, and during cooling, the evaporator 30 is
The heater core 40 and the unit case 60 can be made smaller,
It is possible to reduce the size of the automotive air conditioner.

Further, even when the temperature of the engine cooling water is low, the air whose temperature has been raised can be intermittently blown to the feet of the occupant, and for example, even when the outside air temperature is low, such as in winter, the vehicle is terrified. Since the air is not blown out, it does not discomfort the occupants.

Further, even when the temperature in the vehicle interior becomes extremely high, for example, in the summer, cooler air can be intermittently blown out to the occupant, thereby giving the occupant a cool breeze and awakening effect. be able to. At this time, if the blowing wind has a fluctuation (for example, 1 / f fluctuation), the occupant can be given more comfort.

FIG. 5 is a perspective view showing an example of the rotary door.

Butterfly doors 71 and 73 serve as doors for opening and closing the vent passage 72 and the foot passage 70 at regular intervals.
, A rotary door 75 can be used.

The rotary door 75 includes a cylindrical portion 76 and a support plate 77 provided at an intermediate portion of the cylindrical portion 76 in the axial direction. The support plate 77 has a hole 78 through which a shaft (not shown) for holding the rotary door 75 in a passage (for example, the foot passage 70) is formed. Rectangular holes 79a and 79b are formed in the cylindrical portion 76 at intervals of 180 °.
Therefore, the rotary door 75 is provided with the butterfly door 7.
The passage is opened and closed every time it rotates 90 ° as in the case of 1,73.

The timing of opening and closing the passage by the rotary door 75 is as shown in FIG.

When the rotary door 75 is used, the same effect as in the above embodiment can be obtained.

FIG. 6 is a perspective view showing an example of another rotary door.

Similarly to the rotary door 75 of FIG. 5, a rotary door 80 can be used instead of the butterfly doors 71 and 73.

The rotary door 80 has both end faces 82 in the axial direction.
a and 82b are formed by a closed cylindrical portion 81. End faces 8
A hole 83 through which a shaft (not shown) for holding the rotary door 80 in a passage (for example, the foot passage 70) is passed.
a and 83b are formed respectively. Rectangular holes 84a and 84b are formed in the cylindrical portion 81 at intervals of 180 °. Therefore, the rotary door 80 opens and closes the passage every time it rotates 90 °, similarly to the butterfly doors 71 and 73.

The timing for opening and closing the rotary door 80 is as shown in FIG.

When the rotary door 80 is used, the same effect as in the above embodiment can be obtained.

[0075]

As described above, according to the automotive air conditioner of the first aspect of the present invention, the blowing temperature is not reduced during heating, and the blowing temperature is not increased during cooling.
The heat exchanger for heating, the heat exchanger for cooling, and the unit case can be reduced in size, and the size of the air conditioner for an automobile can be reduced.

According to the vehicle air conditioner of the present invention, the occupant does not feel uncomfortable even when the outside air temperature is low. In addition, even when the outside air temperature is high, the occupant can be given a cool breeze and awakening effect.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an automotive air conditioner according to one embodiment of the present invention.

2A is a perspective view of the vehicle air conditioner shown in FIG. 1, and FIG. 2B is a perspective view of the automotive air conditioner shown in FIG.

FIG. 3 is a perspective view showing an example of a passage member.

FIG. 4 is a diagram showing opening and closing timings of a butterfly door.

FIG. 5 is a perspective view showing an example of a rotary door.

FIG. 6 is a perspective view showing an example of another rotary door.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 blower 30 evaporator (cooling heat exchanger) 40 heater core (heating heat exchanger) 50 air mix door 60 unit case 61 differential blowing opening 62 vent blowing opening 63 foot blowing opening 65 cool air bypass passage 66 hot air passage 67 Air mix space 68, 69 Mode switching door (opening / closing door) 70 Foot passage 71, 73 Butterfly door (door) 72 Vent passage

Claims (2)

[Claims] 1. A blower, a cooling heat exchanger for cooling air from the blower, a heating heat exchanger for heating air from the cooling heat exchanger, and passing through the heating heat exchanger. An air mix door that adjusts the ratio of air to be passed and air that does not pass, a unit case for accommodating them, a cool air bypass passage through which the air that has passed through the heat exchanger for cooling flows, and a air passage that passes through the heat exchanger for heating. A hot air passage through which the blown air flows, and an air mixing space in which air downstream of the cold air bypass passage and air downstream of the hot air passage are mixed, wherein the blower is arranged in the vehicle vertical direction of the cooling heat exchanger. In the automotive air conditioner, which is located on the upper side, the cooling heat exchanger is located on the front side in the vehicle front-rear direction of the heating heat exchanger, and the aermic space is located downstream of the air mixing door. Motor-vehicle air-conditioning system, characterized in that passages for guiding part of the air of the air mixing space the blower upstream is provided in the unit case. 2. An opening for diff, vent, and foot blowing formed in the unit case and downstream of the air mix space, an opening and closing door for opening and closing these openings, The vehicle air conditioner according to claim 1, further comprising: a door provided in a vent passage and a foot passage downstream of the door, the door being capable of opening and closing the vent passage and the foot passage at a constant cycle.