JP2022186273A - Vehicular air conditioner - Google Patents

Abstract

To provide a vehicular air conditioner which can inhibit increase of a concentration of carbon dioxide in air inside a passenger compartment.SOLUTION: A vehicular air conditioner suctions inside air which is air inside a passenger compartment, and outside air which is air outside the passenger compartment, and blows cooled air into the passenger compartment. The vehicular air conditioner includes: a casing 10 which includes an inside air introduction port 11 for suctioning the inside air, an outside air introduction port 12 for suctioning the outside air, an inside air passage 151 for guiding the suctioned inside air to the inside of the passenger compartment, and an outside air passage 152 for guiding the suctioned outside air to the outside of the passenger compartment; a blower 35 which generates airflow in the inside air passage and the outside air passage; a refrigeration cycle which has an evaporation part 41 for cooling the inside air by absorbing heat from the inside air flowing in the inside air passage by use of evaporative latent heat of a refrigerant, and a heat radiation part 42 for performing heat exchange between the refrigerant absorbing heat from the inside air in the evaporation part and the outside air flowing in the outside air passage to radiate heat from the refrigerant; and an outside air introduction part 50 which guides a part of the outside air suctioned from the outside air introduction port to the inside air passage.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present disclosure relates to vehicle air conditioners.

Conventionally, for vehicles provided with an inside air passage through which air drawn from inside the vehicle (hereinafter referred to as inside air) flows, an outside air passage through which air drawn from outside the vehicle (hereinafter referred to as outside air) flows, and a heat exchange block that constitutes a heat pump cycle. Air conditioners are known (see Patent Document 1, for example). In this vehicle air conditioner, the inside air sucked into the inside air passage is heat-exchanged with the refrigerant in the heat exchange block, cooled, and then blown out again into the vehicle interior to circulate the inside air between the vehicle interior and the vehicle air conditioner.

JP 2017-74833 A

By the way, when a vehicle air conditioner that air-conditions the vehicle interior by circulating inside air as in Patent Document 1 is used continuously for a long time, the concentration of carbon dioxide in the air in the vehicle interior increases with the passage of time due to the breathing of the occupant. tend to rise with However, an increase in the concentration of carbon dioxide in the air in the passenger compartment is not preferable because it causes a decrease in concentration of the occupant and makes the occupant more likely to feel drowsy and tired. This was found out after the inventors' intensive studies.

An object of the present disclosure is to provide a vehicle air conditioner capable of suppressing an increase in the concentration of carbon dioxide in the air inside the vehicle.

The invention according to claim 1,
A vehicle air conditioner that draws in internal air, which is the air inside the vehicle, and outside air, which is the air outside the vehicle, and blows out cooled air into the vehicle,
A casing including an inside air inlet (11) for sucking inside air, an outside air inlet (12) for sucking outside air, an inside air passage (151) for guiding the sucked inside air into the vehicle interior, and an outside air passage (152) for guiding the sucked outside air to the outside of the vehicle. (10) and
a blower (35) for generating airflow in the inside air passage and the outside air passage;
An evaporating section (41) cools the inside air by absorbing heat from the inside air flowing through the inside air passage using the latent heat of evaporation of the refrigerant. a refrigeration cycle having a heat radiating part (42) for radiating heat;
an outside air introduction part (50) for guiding part of the outside air sucked from the outside air introduction port to the inside air passage.

According to this, the vehicle air conditioner can blow out part of the outside air into the vehicle interior by introducing part of the outside air introduced into the outside air passage into the inside air passage by the outside air introduction part. Therefore, it is possible to suppress an increase in the concentration of carbon dioxide in the air in the vehicle compartment.

It should be noted that the reference numerals in parentheses attached to each component etc. indicate an example of the correspondence relationship between the component etc. and specific components etc. described in the embodiments described later.

1 is a schematic configuration diagram of a vehicle air conditioner according to a first embodiment; FIG. It is a figure which shows the flow of the air which flows through the inside of the vehicle air conditioner which concerns on 1st Embodiment. 1 is a schematic configuration diagram of a vehicle air conditioner as a comparative example; FIG. It is a schematic block diagram of the vehicle air conditioner which concerns on 2nd Embodiment. It is a schematic block diagram of the vehicle air conditioner which concerns on 3rd Embodiment. FIG. 3 is a schematic configuration diagram of a vehicle air conditioner according to another embodiment; FIG. 3 is a schematic configuration diagram of a vehicle air conditioner according to another embodiment; FIG. 3 is a schematic configuration diagram of a vehicle air conditioner according to another embodiment;

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following embodiments, the same or equivalent parts as those described in the preceding embodiments are denoted by the same reference numerals, and description thereof may be omitted. Moreover, when only some of the components are described in the embodiments, the components described in the preceding embodiments can be applied to the other parts of the components. The following embodiments can be partially combined with each other, even if not explicitly stated, as long as there is no problem with the combination.

(First embodiment)
This embodiment will be described with reference to FIGS. 1 and 2. FIG. In this embodiment, an example in which a vehicle air conditioner 1 that air-conditions the interior of a vehicle is applied to a vehicle will be described. As shown in FIG. 1, the vehicle air conditioner 1 includes a casing 10, a duct portion 20, an air blower 30, a heat exchanger 40, and the like. In this embodiment, the arrow DRud shown in FIG. 1 and the like indicates the up-down direction when the vehicle air conditioner 1 is installed in the vehicle, and the arrow DRw indicates the left-right direction when the vehicle air conditioner 1 is installed in the vehicle. showing.

The casing 10 forms an air flow path through which the air supplied to the interior of the vehicle flows. The casing 10 is formed in a hollow shape, and is made of a material (for example, polypropylene) having a certain degree of elasticity and excellent strength.

The casing 10 is formed with an inside air introduction port 11 for introducing inside air and an outside air introduction port 12 for introducing outside air on the most upstream side of the air flow. Further, the casing 10 has, on the most downstream side of the air flow, an inside air blowing portion 13 for guiding the inside air introduced from the inside air introduction port 11 into the vehicle interior, and an outside air blowing portion for guiding the outside air introduced from the outside air introduction port 12 to the outside of the vehicle interior. A portion 14 is formed. A duct portion 20 is connected to the outside air blowing portion 14 of the casing 10 .

An air passage 15 through which air flows is formed inside the casing 10 . Specifically, the air passage 15 has an inside air passage 151 through which inside air flows and an outside air passage 152 through which outside air flows. It is partitioned into 152.

In addition, the air passage 15 has a blower accommodating portion 153 that accommodates the blower 30 and a heat exchanger accommodating portion 154 that accommodates the heat exchanger 40 . In the air passage 15, the space from the air flow downstream side of the blower accommodating portion 153 to the air flow upstream side of the heat exchanger accommodating portion 154 is formed by the passage partitioning portion 16, and the upper side in the vertical direction DRud is constituted by the outside air passage 152. , and the lower side is partitioned by an internal air passage 151 .

The inside air passage 151 communicates with the inside air introduction port 11 on the upstream side and communicates with the inside air blowing portion 13 on the downstream side. The outside air passage 152 communicates with the outside air introduction port 12 on the upstream side and communicates with the outside air blowing section 14 on the downstream side.

The passage partition 16 is formed integrally with the casing 10 and extends horizontally in a flat plate shape. Further, the passage partitioning portion 16 extends from a portion on the downstream side of the air flow of the fan housing portion 153 to a portion of the heat exchanger housing portion 154 on the upstream side of the air flow along the left-right direction DRw. Further, an outside air introduction part 50 is connected to a portion of the passage partitioning part 16 on the upstream side of the air flow to guide part of the outside air sucked from the outside air introduction port 12 to the inside air passage 151 . The details of the outside air introduction section 50 will be described later.

The inside air introduction port 11 is an opening that introduces inside air into the inside air passage 151 . The inside air introduction port 11 opens inside the instrument panel in the vehicle compartment. The outside air introduction port 12 is an opening that introduces outside air into the outside air passage 152 . The outside air introduction port 12 opens, for example, through a duct (not shown) to a drive unit chamber (not shown) that houses a drive unit of the vehicle.

The inside air blowing portion 13 is an opening for blowing inside air introduced into the inside air passage 151 into the vehicle interior. The inside air blowout part 13 is connected to, for example, a blowout port provided on the ceiling in the passenger compartment via a duct (not shown).

The outside air blowing part 14 is an opening for blowing outside air introduced into the outside air passage 152 to the outside of the casing 10 . The outside air blowing portion 14 is connected to the duct portion 20 on the upstream side of the air flow, and blows outside air introduced into the outside air passage 152 to the duct portion 20 .

The duct portion 20 is an air flow path forming portion for guiding outside air blown out from the casing 10 to the outside of the vehicle compartment. The duct portion 20 is connected to the outside air blowing portion 14 on the upstream side of the air flow, and has a duct blowing portion 21 on the downstream side of the air flow. The duct blowout part 21 is open to, for example, a drive device chamber (not shown) that houses the drive device of the vehicle, and guides the outside air blown out from the casing 10 to the drive device room outside the vehicle.

The blower accommodating portion 153 is formed in the casing 10 immediately downstream of the inside air introduction port 11 and the outside air introduction port 12 so as to extend over the inside air passage 151 and the outside air passage 152 . The blower 30 is housed inside the blower housing portion 153 .

The blower 30 sucks in air and blows out the sucked air to generate an airflow in the air passage 15 . The blower 30 of the present embodiment is a centrifugal blower that has a rotating shaft 31, sucks air along the axial direction of the rotating shaft 31, and blows the sucked air radially outward of the rotating shaft 31. In the blower 30 of the present embodiment, the rotating shaft 31 is arranged along the vertical direction DRud. The blower 30 also has a motor 32 , a first blower fan 33 , a second blower fan 34 , and an inside/outside air partition 35 .

The motor 32 is an electric motor that outputs rotational force for rotating the first blower fan 33 and the second blower fan 34 by electric power supplied from the outside. Motor 32 rotates first blower fan 33 and second blower fan 34 via rotating shaft 31 . The motor 32 is fixed in the air passage 15 by mechanical fastening means such as bolts and screws. Note that the motor 32 may be arranged outside the casing 10 .

The rotating shaft 31 transmits the rotational force output by the motor 32 to the first blower fan 33 and the second blower fan 34 . The rotating shaft 31 is a bar-shaped metal member, and is attached to the first blower fan 33 and the second blower fan 34 through the first blower fan 33 and the second blower fan 34 . The rotary shaft 31 is rotated by the torque output by the motor 32 and transmits the torque output by the motor 32 to the first blower fan 33 and the second blower fan 34 .

The first blower fan 33 and the second blower fan 34 each have a plurality of blades, and rotate integrally with the rotating shaft 31 to generate an airflow in the air passage 15 inside the casing 10 . The first blower fan 33 and the second blower fan 34 are connected via an inside/outside air partition 35 and arranged side by side along the vertical direction DRud. That is, when the direction in which the first blower fan 33 and the second blower fan 34 are arranged is defined as the fan arrangement direction, the fan arrangement direction coincides with the vertical direction DRud.

The first blower fan 33 is arranged in the inside air passage 151 and has an inside air suction port 331 for sucking inside air introduced from the inside air introduction port 11 on the upper side in the vertical direction DRud. The inside air intake port 331 faces the inside air introduction port 11 . The first blower fan 33 generates an airflow in the inside air passage 151 by blowing out the inside air sucked from the inside air suction port 331 toward the downstream side of the inside air passage 151 .

The second blower fan 34 is arranged in the outside air passage 152 and has an outside air suction port 341 for sucking outside air introduced from the outside air introduction port 12 on the lower side in the vertical direction DRud. The second blower fan 34 blows out the outside air sucked from the outside air suction port 341 toward the downstream side of the outside air passage 152 to generate an airflow inside the outside air passage 152 .

The inside/outside air partitioning portion 35 is a partitioning member that prevents the inside air sucked by the first blower fan 33 and the outside air sucked by the second blower fan 34 from being mixed in the blower accommodating portion 153 . The inside/outside air partition 35 is formed in a flat plate shape extending in the horizontal direction. The inside/outside air partition 35 rotates integrally with the first blower fan 33 and the second blower fan 34 when the first blower fan 33 and the second blower fan 34 rotate.

The position in the vertical direction DRud where the inside/outside air partition 35 is arranged overlaps the position in the vertical direction DRud where the passage partition 16 is arranged. In other words, the inside/outside air partitioning portion 35 and the passage partitioning portion 16 overlap in installation position in the direction in which the fans are arranged. Further, the inside/outside air partitioning portion 35 is separated from the outside air introduction portion 50 so as not to contact the outside air introduction portion 50 when rotating.

As a result, the outside air introduced from the outside air introduction port 12 and the inside air introduced from the inside air introduction port 11 from the first blower fan 33 and the second blower fan 34 are separated from each other into the inside air passage 151 and the outside air passage. 152 are blown downstream. The inside air blown out from the first blower fan 33 and the outside air blown out from the second blower fan 34 flow through the inside air passage 151 and the outside air passage 152 while being substantially separated from each other by the passage partitioning portion 16 . A heat exchanger housing portion 154 is provided on the downstream side of the passage partitioning portion 16 in the air flow.

The heat exchanger housing portion 154 is formed across the inside air passage 151 and the outside air passage 152 at the most downstream portion of the air flow in the air passage 15 . The heat exchanger 40 is housed inside the heat exchanger housing portion 154 .

The heat exchanger 40 is a cooling unit that cools the inside air by exchanging heat between the inside air flowing through the inside air passage 151 and the refrigerant, and heats the refrigerant by exchanging heat between the outside air flowing through the outside air passage 152 and the refrigerant. . The heat exchanger 40 has an evaporating section 41 that cools the inside air, a heat radiating section 42 that radiates heat from the refrigerant, and a heat exchange partitioning section 43 that separates the evaporating section 41 and the heat radiating section 42 . The heat exchanger 40 constitutes a vapor compression refrigeration cycle together with a compressor and a decompression mechanism (not shown).

The evaporating section 41 and the heat radiating section 42 are connected via the heat exchange partition section 43 and arranged side by side along the vertical direction DRud. That is, when the direction in which the evaporating portion 41 and the heat radiating portion 42 are arranged is defined as the heat exchange direction, the heat exchange direction coincides with the vertical direction DRud.

The evaporator 41 is arranged in the internal air passage 151, and absorbs heat from the internal air flowing through the internal air passage 151 using the latent heat of vaporization when the low-temperature, low-pressure refrigerant flowing inside the evaporator 41 evaporates. Cooling evaporator. The evaporating section 41 is arranged over substantially the entire area above the heat exchange partitioning section 43 in the heat exchanger accommodating section 154 in the vertical direction DRud. Thereby, the evaporator 41 cools substantially all the inside air flowing through the inside air passage 151 .

The heat radiating section 42 is disposed in the outside air passage 152 and is a condenser that heats the refrigerant by exchanging heat between the refrigerant heated by absorbing heat in the evaporating section 41 and the outside air flowing through the outside air passage 152 . The heat radiation part 42 is arranged over substantially the entire area below the heat exchange partition part 43 in the heat exchanger housing part 154 in the vertical direction DRud. As a result, substantially all of the outside air flowing through the outside air passage 152 is heated by passing through the heat radiating section 42 .

The heat exchange partitioning portion 43 is a partitioning member that suppresses mixing of the inside air passing through the evaporating portion 41 and the outside air passing through the heat radiating portion 42 . The heat exchange partition part 43 is formed in a flat plate shape extending along the horizontal direction. The position in the vertical direction DRud where the heat exchange partition 43 is arranged overlaps the position in the vertical direction DRud where the passage partition 16 is arranged. In other words, the heat exchange partitioning portion 43 and the passage partitioning portion 16 overlap each other in the heat exchange alignment direction.

When the heat exchanger 40 is accommodated in the heat exchanger accommodating portion 154 , the heat exchange partitioning portion 43 is positioned so that the heat exchange partitioning portion 43 does not come into contact with the passage partitioning portion 16 and the inner wall of the casing 10 . 16 and slightly spaced from the inner wall of casing 10 .

As a result, from the heat exchanger 40, the inside air cooled by the evaporator 41 flows downstream in the air passage 151, and the outside air heated by the heat radiating portion 42 flows downstream in the air passage 152. The heat exchanger housing portion 154 continues to the inside air blowing portion 13 . The casing 10 is configured such that the inside air cooled by the evaporating portion 41 can be blown out from the inside air blowing portion 13 into the vehicle interior. The heat exchanger housing portion 154 is also connected to the outside air blowing portion 14 . The casing 10 is configured such that outside air heated by the heat radiating portion 42 can be blown out of the passenger compartment via the outside air blowing portion 14 and the duct portion 20 .

Next, the details of the outside air introduction section 50 will be described. The outside air introduction part 50 of the present embodiment is configured as an integrally molded product integrally formed with the passage partitioning part 16 and is formed in the same flat plate shape as the passage partitioning part 16 . The outside air introduction section 50 is provided on the upstream side of the heat radiation section 42 in the air flow. Specifically, the outside air introduction part 50 continues to the most upstream part of the air flow in the passage partition part 16 provided on the upstream side of the air flow from the heat radiation part 42 .

In addition, the outside air introduction portion 50 is inclined downward in the vertical direction DRud toward the second blower fan 34 from a portion on the upstream side of the air flow of the passage partitioning portion 16 to a position where it does not come into contact with the second blower fan 34 . extended. In other words, the outside air introduction portion 50 is inclined upward in the up-down direction DRud so as to approach the passage partitioning portion 16 from the upstream side of the air flow toward the downstream side of the air flow.

In the external air introduction section 50 formed in this manner, the most upstream introduction section 51, which is the most upstream part of the air flow, is located below the passage partitioning section 16 and the inside/outside air partitioning section 35 in the vertical direction DRud. That is, the most upstream introduction portion 51 is positioned in the external air passage 152 . Specifically, the most upstream introduction portion 51 is positioned at the uppermost portion when the external air passage 152 is divided into four equal parts in the vertical direction DRud. A portion of the outside air introduction portion 50 on the downstream side of the air flow is connected to the passage partition portion 16 .

The outside air introduction part 50 is formed so that a part of the outside air blown from the second blower fan 34 toward the downstream side of the air flow of the outside air passage 152 flows along the outside air introduction part 50 to flow into the inside air passage 151 . It is

At the inclination angle θ of the outside air introduction part 50 in this embodiment, most of the amount of the outside air blown out by the second blower fan 34 is guided to the outside air passage 152 and a small amount is guided to the inside air passage 151. is set to For example, when the direction in which the passage partitioning portion 16 extends leftward in the left-right direction DRw from the connection portion between the passage partitioning portion 16 and the outside air introduction portion 50 is 0°, and the counterclockwise direction is the positive direction, the inclination angle θ is , 5°≦θ≦45°.

As a result, part of the outside air blown out from the second blower fan 34 and flowing toward the downstream side of the outside air passage 152 is guided to the inside air passage 151 . Further, even when part of the air volume of the outside air blown by the second blower fan 34 flows into the internal air passage 151 , a sufficient air volume can be sent to the heat radiating section 42 . Therefore, the cooling capacity of the heat radiating portion 42 is ensured when the coolant is cooled by heat exchange between the outside air and the coolant in the heat radiating portion 42 .

Next, the operation of the vehicle air conditioner 1 will be described. In FIG. 2, for convenience of explanation, in order to make it easier to understand the outside air and inside air, the arrows indicating the flow of inside air are hatched with dot patterns, and the arrows indicating the flow of outside air are not hatched. shown in

When the first blower fan 33 and the second blower fan 34 are rotationally driven by the motor 32, the inside air is introduced from the inside air introduction port 11 into the inside air passage 151 of the vehicle air conditioner 1, and the inside air is introduced from the outside air introduction port 12 into the outside air passage. Outside air is introduced at 152 .

The inside air introduced into the inside air passage 151 is sucked into the inside of the first blower fan 33 through the inside air suction port 331 and flows toward the downstream side of the inside air passage 151 without being mixed with the outside air by the inside/outside air partitioning portion 35 . is blown out. After that, the inside air flowing through the inside air passage 151 is cooled and dehumidified while passing through the evaporating portion 41 and is blown out from the inside air blowing portion 13 into the vehicle interior. The inside air blown into the vehicle interior cools the inside of the vehicle interior, and is again introduced into the inside air passage 151 through the inside air introduction port 11 .

In addition, the outside air introduced into the outside air passage 152 is sucked into the inside of the second blower fan 34 from the outside air suction port 341, and is not mixed with the inside air by the inside/outside air partitioning section 35. blown out toward

Here, part of the outside air blown out from the second blower fan 34 toward the downstream side of the outside air passage 152 flows along the outside air introduction portion 50 and is led to the inside air passage 151, and the rest of the air flows. flows toward the heat radiating portion 42 . The outside air flowing toward the heat radiating portion 42 exchanges heat with the refrigerant when passing through the heat radiating portion 42, is heated, flows from the outside air blowing portion 14 to the duct portion 20, and is blown out of the vehicle compartment from the duct blowing portion 21. .

On the other hand, the outside air guided to the inside air passage 151 is mixed with the inside air blown out from the first blower fan 33, cooled and dehumidified while passing through the evaporating section 41, and then enters the vehicle interior through the inside air blowing section 13. blown out.

The reason why part of the outside air introduced into the outside air passage 152 is mixed with the inside air in the inside air passage 151 in this way will be described. If the vehicle air conditioner 1 that cools the vehicle interior by circulating only the inside air between the vehicle interior and the vehicle air conditioner 1 is used continuously for a long time, the air in the vehicle interior will be affected by the breathing of the occupant. The concentration of carbon dioxide tends to rise over time. In this case, the air inside the passenger compartment has a higher concentration of carbon dioxide than the air outside the passenger compartment.

Then, an increase in the concentration of carbon dioxide in the air inside the vehicle becomes a factor that lowers the concentration of the driver, which may hinder the driver's appropriate driving work. Furthermore, an increase in the concentration of carbon dioxide in the air inside the vehicle may make the driver more likely to feel drowsy and tired, and may interfere with the driver's proper driving work.

On the other hand, in the vehicle air conditioner 1 of the present embodiment, part of the outside air introduced into the outside air passage 152 is guided to the inside air passage 151 by the outside air introduction part 50, and the part of the outside air is blown into the vehicle interior. be able to. According to this, it is possible to suppress an increase in the concentration of carbon dioxide in the air in the passenger compartment, compared to a case without such a configuration.

In the vehicle air conditioner 1 of the present embodiment, a small gap is provided between the heat exchange partition 43 and the passage partition 16 and between the heat exchange partition 43 and the inner wall of the casing 10. . Further, in the case where the outside air introduction part 50 is not provided as in the vehicle air conditioner for comparison shown in FIG. A slight gap is provided between the inside/outside air partitioning portion 35 and the passage partitioning portion 16 . Therefore, even if the outside air introduction part 50 is not provided, part of the outside air introduced into the outside air passage 152 may flow into the inside air passage 151 through the gap.

However, when the air introduced into the casing 10 from the outside air inlet 12 and the inside air inlet 11 flows through the air passage 15, it tends to flow toward a flow path with a low resistance rather than a flow path with a high resistance. The resistance of the flow path varies depending on the mode of the flow path, such as the flow path area, flow path shape, and flow path length. Therefore, when the resistance of the inside air passage 151 is higher than the resistance of the outside air passage 152, it is difficult to reliably flow the outside air introduced into the outside air passage 152 into the inside air passage 151 through these gaps.

On the other hand, in the vehicle air conditioner 1 of the present embodiment, by providing the outside air introduction portion 50, compared to the case where a slight gap is simply provided between the inside/outside air partitioning portion 35 and the passage partitioning portion 16, , part of the outside air can be reliably guided to the inside air passage 151 .

(1) In the above embodiment, the outside air introduction section 50 is provided upstream of the heat radiation section 42 in the air flow. Here, if the outside air introduction part 50 is provided downstream of the heat radiation part 42 in the air flow, part of the outside air heated by passing through the heat radiation part 42 passes through the evaporation part 41 by the outside air introduction part 50. and mixed with the cooled internal air. In the case of such a configuration in which the outside air heated by the heat radiating portion 42 is mixed with the inside air in the inside air passage 151, the temperature of the inside air blown into the vehicle interior increases. This causes a decrease in cooling performance when cooling the vehicle interior.

On the other hand, the outside air introduction part 50 of the present embodiment is provided upstream of the heat radiation part 42 in the air flow. According to this, it is possible to suppress the outside air heated by passing through the heat radiating section 42 from being mixed with the inside air that has been cooled by passing through the evaporating section 41, so that the deterioration of the cooling performance can be prevented when cooling the vehicle interior. can be suppressed.

(2) In the above embodiment, the outside air introduction part 50 is provided between the passage partitioning part 16 and the inside/outside air partitioning part 35 . By the way, the outside air blown out from the second blower fan 34 becomes more stable as it flows toward the downstream side in the outside air passage 152 . Therefore, when outside air flowing through the outside air passage 152 is introduced into the inside air passage 151, the closer the outside air is to the downstream side of the air flow, the greater the pressure loss caused by the turbulence of the air flow that occurs when the outside air is introduced into the inside air passage 151.

In contrast, in the present embodiment, the outside air introduction portion 50 is provided between the passage partition portion 16 and the inside/outside air partition portion 35 . Therefore, the outside air introduction section 50 can introduce the outside air immediately after being blown out from the second blower fan 34 into the inside air passage 151 . Therefore, the pressure loss that occurs when the air is introduced into the internal air passage 151 can be suppressed as compared to the case where the air is not configured in this way.

(First Modification of First Embodiment)
In the first embodiment described above, an example has been described in which the most upstream introduction portion 51 of the outside air introduction portion 50 is positioned at the uppermost portion when the outside air passage 152 is divided into four equal parts in the vertical direction DRud. Not limited. For example, the outside air introduction part 50 may be configured such that the most upstream part 51 of the outside air introduction part 51 is positioned at a part different from the uppermost part when the outside air passage 152 is divided into four equal parts in the vertical direction DRud.

(Second Modification of First Embodiment)
In the first embodiment described above, an example in which the inclination angle θ of the outside air introduction portion 50 is set to an angle within the range of 5°≦θ≦45° has been described, but the present invention is not limited to this. For example, the outside air introduction part 50 may be set to have an inclination angle θ within the range of 0°<θ<5°, or may be set to an angle within the range of 45°<θ<180°. .

(Second embodiment)
Next, a second embodiment will be described with reference to FIG. The present embodiment differs from the first embodiment in the position where the outside air introduction section 50 is provided. In this embodiment, portions different from the first embodiment will be mainly described, and descriptions of portions similar to the first embodiment may be omitted.

As shown in FIG. 4, the outside air introduction part 50 of this embodiment continues to the most downstream part of the air flow in the passage partitioning part 16 . The external air introducing portion 50 extends from a portion of the passage partitioning portion 16 on the downstream side of the air flow toward the evaporating portion 41 so as to be inclined upward in the vertical direction DRud to a position where it does not contact the evaporating portion 41 . In other words, the outside air introduction portion 50 is inclined upward in the vertical direction DRud so as to separate from the passage partitioning portion 16 from the upstream side of the air flow toward the downstream side of the air flow.

In the outside air introduction part 50 formed in this manner, the most downstream part 52 of the outside air introduction part 50, which is the part on the most downstream side of the air flow, is positioned above the passage partition part 16 and the inside/outside air partition part 35 in the vertical direction DRud. do. That is, the introduction most downstream portion 52 is positioned in the internal air passage 151 . Specifically, the introduction most downstream portion 52 is positioned at the lowest portion when the internal air passage 151 is divided into four equal parts in the vertical direction DRud. A portion of the outside air introduction portion 50 on the upstream side of the air flow is connected to the passage partition portion 16 . For this reason, part of the outside air blown out from the second blower fan 34 toward the downstream side of the outside air passage 152 flows along the outside air introduction portion 50 to flow into the inside air passage 151 .

Therefore, in the vehicle air conditioner 1 of the present embodiment, part of the outside air introduced into the outside air passage 152 is led to the inside air passage 151 by the outside air introduction part 50, so that part of the outside air can be blown out into the vehicle interior. can. According to this, it is possible to suppress an increase in the concentration of carbon dioxide in the air in the passenger compartment, compared to a case without such a configuration.

(Modification of Second Embodiment)
In the above-described second embodiment, an example has been described in which the introduction most downstream portion 52 of the outside air introduction portion 50 is positioned at the lowest portion when the inside air passage 151 is divided into four equal parts in the vertical direction DRud. is not limited to For example, the outside air introduction part 50 may be configured such that the most downstream introduction part 52 is positioned at a position different from the lowermost position when the inside air passage 151 is divided into four equal parts in the vertical direction DRud.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG. This embodiment differs from the second embodiment in the position where the outside air introduction part 50 is provided and the shape of the passage partition part 16 . In this embodiment, portions different from the second embodiment will be mainly described, and descriptions of portions similar to the first embodiment may be omitted.

As shown in FIG. 5, the passage partitioning portion 16 of the present embodiment has a through-hole forming portion 162 that forms a passage through-hole 161 that communicates the inside air passage 151 and the outside air passage 152 at substantially the center in the left-right direction DRw. is doing. The outside air introduction portion 50 of the present embodiment continues to a portion of the through-hole forming portion 162 on the upstream side of the air flow. Further, the outside air introduction portion 50 is inclined upward in the vertical direction DRud toward the downstream side of the air flow. In other words, the outside air introduction part 50 is inclined away from the passage partition part 16 from the upstream side of the air flow toward the downstream side of the air flow.

The outside air blown out from the second blower fan 34 toward the air flow downstream side of the outside air passage 152 by the outside air introduction part 50 formed in this manner flows along the outside air introduction part 50, It flows into the internal air passage 151 . Therefore, in the vehicle air conditioner 1 of the present embodiment, part of the outside air introduced into the outside air passage 152 is led to the inside air passage 151 by the outside air introduction part 50, so that part of the outside air can be blown out into the vehicle interior. can. According to this, it is possible to suppress an increase in the concentration of carbon dioxide in the air in the passenger compartment, compared to the case where it is not configured in this way.

(Modified example of the third embodiment)
In the third embodiment described above, an example has been described in which the outside air introducing portion 50 continues to the through-hole forming portion 162 formed substantially in the center of the passage partitioning portion 16 in the left-right direction DRw, but the present invention is not limited to this. For example, the formation position of the through-hole forming portion 162 is not limited, and the outside air introducing portion 50 is configured to be connected to the through-hole forming portion 162 formed on the right or left side of the center of the passage partitioning portion 16 in the left-right direction DRw. There may be.

(Other embodiments)
Although representative embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and can be modified in various ways, for example, as follows.

In the above-described embodiment, the example in which the external air introduction section 50 is provided on the upstream side of the heat radiation section 42 in the air flow has been described, but the present invention is not limited to this. For example, the outside air introduction section 50 may be provided downstream of the heat radiation section 42 in the air flow, as shown in FIG. Specifically, outside air introduction part 50 is inclined such that outside air flowing through outside air passage 152 flows toward inside air blowing part 13 at a portion between inside air blowing part 13 and outside air blowing part 14 in the outer peripheral portion of casing 10 . It may be configured to

In the above-described embodiment, an example in which the outside air introduction section 50 is configured to be continuous with the passage partition section 16 has been described, but the present invention is not limited to this. For example, as shown in FIG. 7, the outside air introduction part 50 is configured such that the position in the vertical direction DRud where the inside/outside air partitioning part 35 is arranged is displaced above the position where the passage partitioning part 16 is arranged in the vertical direction DRud. may be In this case, part of the outside air blown by the second blower fan 34 can be guided to the inside air passage 151 .

In addition, as shown in FIG. 8, the outside air introduction part 50 displaces the position in the vertical direction DRud where the heat exchange partition part 43 is arranged to the lower side in the vertical direction DRud than the position where the passage partition part 16 is arranged. It may be a configuration. In this case, part of the outside air blown out from the second blower fan 34 and flowed into the heat exchanger housing portion 154 can be guided to the internal air passage 151 .

In the above-described embodiment, an example in which the outside air introducing portions 50 are provided at different positions in the vehicle air conditioners 1 of the first to third embodiments has been described, but the present invention is not limited to this. For example, the outside air introduction part 50 may have a configuration in which two or more of the three outside air introduction parts 50 described in the first to third embodiments are combined.

In the above-described embodiment, the example in which the blower 30 includes the first blower fan 33 and the second blower fan 34 each having a blade has been described, but the present invention is not limited to this. For example, the blower 30 may be a centrifugal blower in which the first blower fan 33 and the second blower fan 34 are integrated.

In the above-described embodiment, an example in which the evaporating portion 41 and the heat radiating portion 42 are integrally configured and arranged in the air passage 15 has been described, but the present invention is not limited to this. For example, the evaporating portion 41 and the heat radiating portion 42 may not be integrally configured, and the evaporating portion 41 may be arranged in the inner air passage 151 and the heat radiating portion 42 may be arranged in the outer air passage 152. .

In the above-described embodiments, it goes without saying that the elements that make up the embodiments are not necessarily essential unless explicitly stated as essential or clearly considered essential in principle.

In the above-described embodiments, when numerical values such as the number, numerical value, amount, range, etc. of the constituent elements of the embodiment are mentioned, when it is explicitly stated that they are essential, and in principle they are clearly limited to a specific number It is not limited to that particular number, unless otherwise specified.

In the above-described embodiments, when referring to the shape, positional relationship, etc. of components, etc., the shape, positional relationship, etc., unless otherwise specified or limited in principle to a specific shape, positional relationship, etc. etc. is not limited.

REFERENCE SIGNS LIST 10 casing 11 inside air introduction port 12 outside air introduction port 35 blower 41 evaporating section 42 heat radiation section 50 outside air introduction section 151 inside air passage 152 outside air passage

Claims (6)

A vehicular air conditioner that draws in internal air, which is the air inside the vehicle, and outside air, which is the air outside the vehicle, and blows out cooled air into the vehicle,
An inside air introduction port (11) for sucking in the inside air, an outside air introduction port (12) for sucking in the outside air, an inside air passage (151) for guiding the sucked inside air into the vehicle interior, and an outside air passage for guiding the sucked outside air to the outside of the vehicle interior. a casing (10) containing (152);
a blower (35) for generating an airflow in the inside air passage and the outside air passage;
an evaporating section (41) for cooling the inside air by absorbing heat from the inside air flowing through the inside air passage using the latent heat of vaporization of the refrigerant; a refrigeration cycle having a heat radiation part (42) for exchanging heat with and radiating heat from the refrigerant;
and an outside air introduction section (50) for introducing a part of the outside air sucked from the outside air introduction port into the inside air passage. The heat radiation part is provided in the outside air passage,
2. The vehicle air conditioner according to claim 1, wherein the outside air introduction portion is provided on an air flow upstream side of a portion of the outside air passage where the heat radiation portion is provided. The casing has a passage partition (16) that partitions the inside air passage and the outside air passage,
3. The vehicle air conditioner according to claim 2, wherein the outside air introducing portion continues to the passage partitioning portion and guides part of the outside air flowing through the outside air passage to the inside air passage. The blower includes a first blower fan (33) provided on the upstream side of the air flow from the passage partition, sucking in the inside air and blowing out the sucked inside air to generate an air flow in the inside air passage; a second blower fan (34) that sucks in outside air and blows out the sucked outside air to generate an airflow in the outside air passage; the inside air sucked in by the first blower fan and the outside air sucked in by the second blower fan has an inside/outside air partition (35) that suppresses mixing of
When the direction in which the first blower fan and the second blower fan are arranged is defined as the fan arrangement direction, the position of the passage partition in the fan arrangement direction overlaps the inside/outside air partition. cage,
4. The outside air introduction portion is provided between the passage partitioning portion and the inside/outside air partitioning portion, and is inclined from the upstream side of the air flow toward the downstream side of the air flow so as to approach the passage partitioning portion. The vehicle air conditioner according to . The heat radiating section and the evaporating section are connected via a heat exchange partition (43),
The evaporator is provided inside the internal air passage,
The passage partitioning portion is provided upstream of the heat exchange partitioning portion in the air flow. The position provided overlaps with the heat exchange partition,
4. The outside air introduction section is provided between the passage partition and the heat exchange partition, and is inclined away from the passage partition from the upstream side of the air flow toward the downstream side of the air flow. 5. The vehicle air conditioner according to 4 above. The passage partitioning portion has a through hole forming portion (162) that forms a flow passage through hole (161) that communicates the outside air passage and the inside air passage,
6. The external air introducing portion according to any one of claims 3 to 5, wherein the outside air introducing portion is connected to the through hole forming portion and is inclined from the upstream side of the air flow toward the downstream side of the air flow so as to separate from the passage partitioning portion. air conditioner for vehicles.

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