JP2001150926A - Air conditioner for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner for automobile capable of controlling temperature properly without decreasing blow amount. SOLUTION: This air conditioner comprises a blower 10, an evaporator 30, a heater core 40, an air mixing door 50, a unit case 60 adapted to contain all of these, a cold wind by-pass 65 where air having passed through the evaporator 30 flows, a warm wind passage 66 where air having passed through the heater core 40 flows and an air mixing chamber 68 where downstream air of the cold wind by-pass 65 mixes with that of the warm wind passage 66. The blower 10 is positioned on an upper side of the evaporator 30 in a vehicular vertical direction V. The evaporator 30 is positioned on a front side of the heater core 40 in a vehicular vertical direction H. The air mixing chamber 68 is positioned downstream the air mixing door 50. A warm wind by-pass 67 adapted to guide part of downstream air of the heater core 40 to the air mixing chamber 68 is formed on both side face parts of the unit case 60. A dimension of the air mixing chamber 68 in a vehicular transverse direction is larger than that of the cold wind by-pass 65.

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 an automobile, and more particularly to an air conditioner for an automobile in which a blower (excluding a motor), a heat exchanger for cooling, and a heat exchanger for heating are integrally housed in a unit case. .

[0002]

2. Description of the Related Art A conventional air conditioner for a so-called blower-integrated automobile is disclosed in Japanese Patent Application Laid-Open No. 9-99725.

This automotive air conditioner adjusts the ratio of 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 and air not passing therethrough. Air mixing doors, a unit case accommodating them, 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, and the air downstream of the cold air bypass passage and the hot air passage. An air mix chamber in which downstream air is mixed.

[0004] The blower is located above the evaporator, which is arranged substantially vertically, in the vehicle vertical direction, the evaporator is located in front of the heater core in the vehicle longitudinal direction, and the air mix chamber is located downstream of the air mix door.

[0005] The air that has passed through the evaporator is distributed by an air mixing door to a heater core and a cool air bypass passage that bypasses the heater core.

[0006] The air heated through the heater core flows into the air mixing chamber through the warm air passage, and the air bypassing the heater core flows directly into the aermic chamber from the cool air bypass passage.

[0007] Thereafter, the air (warm air and cool air) is mixed in the air mixing chamber, and the mixed air is blown out of the unit case through the differential blowing opening, the vent blowing opening, and the foot blowing opening.

[0008]

By the way, in the above-mentioned air conditioner for an automobile, the differential air blowing in the main traveling direction of the air in the cool air bypass passage in the air mix mode (during the bi-level mode and the differential foot mode). The opening and the vent outlet are located, and the foot outlet is located in the main traveling direction of the air in the warm air passage in the air mix mode.

Therefore, for example, in the bi-level mode, the temperature of the air flowing from the air mix chamber to the vent outlet becomes lower than necessary, and the air blown from the vent outlet and the air blown out from the foot outlet. The temperature difference with air becomes too large.

Although this can be prevented by providing a fixed guide for adjusting the temperature of the blown air in the unit case, for example, there is a problem that the ventilation resistance at the time of full cold increases and the amount of air blows decreases.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object thereof is to provide an automotive air conditioner capable of appropriately adjusting the temperature of blown air without reducing the amount of air blown. is there.

[0012]

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. A mixing space, a differential blowing opening, a vent blowing opening, and a foot blowing opening provided downstream of the air mix 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 front-rear direction of the vehicle, the air mix space is located downstream of the air mix door, and the air in the cool air bypass passage in the air mix mode. In the automotive air conditioner, the differential blowing opening and the vent blowing opening are located on the main traveling direction of the air, and the foot blowing opening is located on the main traveling direction of the air in the hot air passage in the air mix mode. Hot air bypass passages for guiding a portion of the air downstream of the heating heat exchanger to the cold air bypass passages are formed on both side surfaces of the unit case, and the vehicle lateral direction between the hot air passages and the both hot air bypass passages The sum of the dimensions is larger than the dimension of the cold air bypass passage in the left-right direction of the vehicle.

The air mix mode means a bilevel mode or a differential foot mode, and the main traveling direction means a direction in which the main flow of air travels. For example, in the bi-level mode, a part of the air downstream of the hot air passage is guided to the downstream of the cold air bypass passage along the hot air bypass passage, and the air mixed with the mixed air downstream of the cool air bypass passage is vented. Blow out from. Further, at the time of full cooling, the cool air is blown out of the predetermined outlet through the air mix space from the cool air bypass passage without narrowing the passage.

According to a second aspect of the present invention, in the vehicle air conditioner according to the first aspect, the sum of the dimension of the hot air passage and the both hot air bypass passages in the vehicle left-right direction is the same as that of the cold air bypass passage. It is characterized by being 1.2 to 1.3 times the dimension in the direction.

The sum of the hot air passage and the two hot air bypass passages in the vehicle left-right direction and the vehicle left-right size of the air mix space are set to 1.2 to the vehicle left-right size of the cold air bypass passage.
By making it 1.3 times, a required amount of warm air can be guided to the air mix space via the warm air bypass passage.

According to a third aspect of the present invention, in the vehicle air conditioner according to the first aspect, the hot air bypass passage is formed by expanding the unit case outward.

At the time of full cooling, the cross section of the cold air bypass passage is not narrowed, so that the ventilation resistance does not increase.

[0018]

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

FIG. 1 is a longitudinal sectional view showing the internal structure of an automotive air conditioner according to one embodiment of the present invention, and FIG.
FIG. 3 is a cross-sectional view taken along the arrow II, and FIG. 3 is a diagram illustrating flows of cold air and hot air. In FIG. 3, the cool air is indicated by a solid line, and the warm air is indicated by an alternate long and short dash line.

The air conditioner 1 for a vehicle includes a blower 10
, Filter 20, and evaporator (cooling heat exchanger)
30, a heater core (heating heat exchanger) 40, an air mix door 50, and a unit case 60.

The blower 10 is located above the evaporator 30 in the vehicle vertical direction V. The blower 10 includes a motor (not shown), a casing unit 11, and a scroll fan 12.

The casing part 11 includes a scroll fan 12
Rectifies the radial flow coming out from the fan and collects it in one direction, or efficiently converts the dynamic pressure obtained by the fan into static pressure. The scroll casing part 11 forms a part of the unit case 60.

The filter 20 is mounted on the upstream side of the evaporator 30 in parallel with the evaporator 30, and removes dust and the like entering from inside and outside of the vehicle.

The evaporator 30 is located on the front side of the heater core 40 in the vehicle longitudinal direction H, and cools the air from the blower 10. The evaporator 30 is inclined with respect to the vehicle vertical direction V so that air from the blower 10 flows easily.

The heater core 40 heats the air that has passed through the evaporator 30.

The air mix door 50 is connected to the evaporator 30.
The ratio of the air passing through the heater core 40 to the air passing through the heater core 40 is adjusted.

The unit case 60 includes a blower (excluding a motor) 10, a filter 20, an evaporator 30,
The heater core 40 is housed.

The unit case 60 has a differential blow opening 61, a vent blow opening 62, and a foot blow opening 63.
Is provided. The opening 61 for differential blowing, the opening 62 for vent blowing, and the opening 63 for foot blowing are opened and closed doors 71, 7.
It is opened and closed by 2.

In the unit case 60, a cool air bypass passage 65 through which 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 chamber (air mix space) 68 in which air downstream of the air mix chamber is mixed.

On both sides of the unit case 60, hot air bypass passages 67 are provided to guide a part of the air downstream of the heater core 40 directly to the air mixing chamber 68. As shown in FIG. 2, the hot air bypass passage 67 is formed by partially expanding both side surfaces of the unit case 60 in the vehicle left-right direction LR.

The sum th of the hot air passage 66 and both hot air bypass passages 67 in the vehicle left-right direction is 1.2 to 1.3 times the vehicle left-right size tc of the cool air bypass passage (FIG. 2).
reference).

In the air mix mode, the evaporator 30 is moved from the blower 10 through the air passage 13 as shown by an arrow a.
The air introduced into the air-mixed door 5
The air is divided into two, and one air flows to the cold air bypass passage 65 as shown by the arrow b, and the other air flows over the partition wall 69 to the heater core 40 as shown by the arrow c.

The air flowing to the heater core 40 is heated when passing through the heater core 40 and flows through the hot air passage 66.

The air cooled when passing through the evaporator 30 passes through a cool air bypass passage 65 and a hot air passage 66.
It is mixed with warm air in the downstream air mix chamber 68.

A part of the air heated when passing through the heater core 40 passes through the hot air bypass passages 67 on both sides of the cold air bypass passage 65, as shown by an arrow d (see FIG. 3). 68, and the warm air and the mixed air mix.

In the full cool mode, the air introduced into the evaporator 30 from the blower 10 through the air passage 13 as shown by the arrow a flows into the cool air bypass passage 65 along the bent air mix door 50.

The air cooled when passing through the evaporator 30 flows from the air mix chamber 68 to the differential blow opening 61, the vent blow opening 62, and the foot blow opening 63 through the cool air bypass passage 65.

According to this embodiment, the cool air and the hot air can be appropriately mixed during the air mixing, and the air blown out from the vent blowout opening 62 and the air blown out from the foot blowout opening 63 in the bilevel mode. It is possible to prevent the temperature difference from the air to be heated from becoming too large. The same effect can be obtained in the differential foot mode.

Further, at the time of full cooling, the cross section of the cool air bypass passage 65 is not narrowed as in the case where a fixed guide (not shown) for reducing the ratio of the cool air to be mixed is used. There is no decrease in air volume.

[0040]

As described above, according to the automotive air conditioner of the present invention, for example, in the bilevel mode, the air blown out from the vent blowout opening and the air blown out from the foot blowout opening are mixed. The temperature difference can be prevented from becoming too large, and the ventilation resistance at the time of full cooling does not increase, thereby preventing a decrease in the amount of air blown. Therefore, it is possible to perform appropriate adjustment of the outlet air temperature,
That is, the temperature adjustment performance is improved.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a diagram illustrating flows of cold air and hot air.

[Explanation of symbols]

 Reference Signs List 1 air conditioner for automobile 10 blower 30 evaporator (heat exchanger for cooling) 40 heater core (heat exchanger for heating) 50 air mix door 60 unit case 65 cold air bypass passage 66 hot air passage 67 hot air bypass passage 68 airmic chamber ( Air mix space)

Claims (3)

[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 air flows, an air mix space in which air downstream of the cool air bypass passage and air downstream of the hot air passage are mixed, and a differential blowing opening provided downstream of the air mix space; A vent blowout opening and a foot blowout opening, wherein the blower is located above the cooling heat exchanger in the vehicle vertical direction, and the cooling heat exchanger is in the vehicle longitudinal direction front of the heating heat exchanger. The air mixing space is located downstream of the air mixing door, and a differential blowing opening and a vent blowing opening are positioned in a main traveling direction of air in the cool air bypass passage in an air mixing mode, In a vehicle air conditioner in which a foot outlet is located in a main traveling direction of air in the hot air passage in the mixed mode, a part of air downstream of the heating heat exchanger is guided to the cool air bypass passage. Hot air bypass passages are formed on both side surfaces of the unit case, and the sum of the hot air passage and the both hot air bypass passages in the vehicle left-right direction is larger than the cold air bypass passage in the vehicle left-right direction. Automotive air conditioners. 2. A vehicle according to claim 1, wherein the sum of the hot air passage and the both hot air bypass passages in the vehicle left-right direction is 1.2 to 1.3 times the vehicle left-right size of the cold air bypass passage. The vehicle air conditioner according to claim 1. 3. The vehicle air conditioner according to claim 1, wherein the hot air bypass passage is formed by expanding the unit case outward.