CN110785305B

CN110785305B - Air conditioner for vehicle

Info

Publication number: CN110785305B
Application number: CN201880041810.8A
Authority: CN
Inventors: 石黑俊辅; 石山尚敬; 河合孝昌; 中嶋健太; 熊田辰己
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 2017-07-28
Filing date: 2018-06-15
Publication date: 2022-12-30
Anticipated expiration: 2038-06-15
Also published as: JP2019026039A; DE112018003844T5; CN110785305A; JP6791049B2; WO2019021682A1

Abstract

An air conditioning device (10) for a vehicle is provided with an air conditioning unit (100) and a particle detection unit (200). An air introduction chamber (160) is formed in a portion of the air conditioning unit where the particle detection unit is attached, the air introduction chamber being a space in which air introduced to the inside of the air conditioning unit flows. The particle detection unit has a housing (210) in which a first opening (220) through which air from the air introduction chamber flows and a second opening (240) through which air is discharged into the air introduction chamber are formed. The air conditioning device for a vehicle further includes a precision improving unit (171) that improves the measurement precision of the particle detecting unit by suppressing at least one of the inflow of air into the interior of the housing through a path that does not pass through the first opening and the inflow of particles larger than the particles to be measured from the first opening into the interior of the housing.

Description

Air conditioner for vehicle

Cross reference to related applications

This application is based on japanese patent application No. 2017-146619, filed on 2017, 7, 28, the entire contents of which are incorporated by reference into the present specification.

Technical Field

The present invention relates to an air conditioner for a vehicle.

Background

The vehicle air conditioning apparatus adjusts the temperature of air taken in from the vehicle interior or the outside of the vehicle, and blows out the temperature-adjusted air (i.e., conditioned air) into the vehicle interior. The temperature of the air is adjusted by a heater core or an evaporator in the air conditioning unit, as described in patent document 1 below, for example.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2008-24032

The inventors of the present application have studied a case where a function of measuring the concentration of particles (for example, PM 2.5) floating in the air is given to a vehicle. For example, if the air conditioning apparatus for a vehicle includes a particle detection unit that optically measures the particle concentration, and is configured such that a part of the air taken into the air conditioning unit from the vehicle interior flows through the particle detection unit, the particle concentration in the air in the vehicle interior can be measured.

Preferably, the particle detection unit is directly supplied with the particle without changing the particle concentration of the air in the vehicle compartment to be measured. However, according to the results confirmed by the inventors of the present application through experiments and the like, the following new problems were found: depending on the shape of the air flow path near the particle detection unit, the accuracy of measuring the particle concentration may be deteriorated.

For example, although an opening that is an inlet for air to be measured is formed in the case of the particle detection unit, air may flow into the case from a location different from the opening (for example, a gap formed in a connecting portion of the member). The particle concentration of the air tends to decrease when passing through the gap. Therefore, when the amount of air flowing in from the gap increases, the particle concentration measured by the particle detection unit becomes lower than the actual particle concentration.

Further, even when most of the air flows into the case through the opening, the accuracy of measuring the particle concentration may be lowered. For example, when the air contains particles larger than the particles to be measured, the particle concentration measured by the particle detection unit becomes higher than the actual particle concentration.

Disclosure of Invention

The purpose of the present invention is to provide an air conditioning device for a vehicle, which is capable of measuring the concentration of particles in the air with high accuracy.

The air conditioner for a vehicle of the present invention includes: an air conditioning unit that supplies air conditioned air into a vehicle interior; and a particle detection unit that measures the concentration of particles in the air. An air introduction chamber, which is a space in which air introduced to the inside of the air conditioning unit flows, is formed in a portion of the air conditioning unit where the particle detection unit is attached. The particle detection unit includes a housing having a first opening through which air from the air introduction chamber flows and a second opening through which air is discharged into the air introduction chamber, and is configured to measure a concentration of particles in the air flowing from the first opening into the housing. The air conditioner for a vehicle further includes a precision improving unit that improves the measurement precision of the particle detecting unit by suppressing at least one of the inflow of air into the interior of the casing through a path that does not pass through the first opening and the inflow of particles larger than the particles to be measured from the first opening into the interior of the casing.

In the vehicle air conditioner having such a configuration, for example, air from the surrounding space is introduced into the inside of the air conditioning unit through the air introduction chamber by the operation of the fan provided in the air conditioning unit. The particle detection unit takes a part of the air flowing through the air introduction chamber into the case through the first opening, and measures the concentration of particles in the air. Therefore, if the air in the vehicle interior is configured to flow into the air introduction chamber, the concentration of particles in the air in the vehicle interior can be measured.

The air conditioner for a vehicle includes an accuracy improving unit for improving measurement accuracy of the particle detecting unit. The accuracy improving section suppresses at least one of inflow of air into the interior of the case through a path that does not pass through the first opening and inflow of particles larger than the particles to be measured from the first opening into the interior of the case. In such a vehicle air conditioner, since the accuracy improving section prevents the measurement accuracy from being lowered, the particle concentration in the air can be measured with high accuracy.

According to the present invention, there is provided an air conditioner for a vehicle capable of measuring a particle concentration in air with high accuracy.

Drawings

Fig. 1 is a diagram schematically showing the configuration of a vehicle air conditioner according to a first embodiment.

Fig. 2 is a perspective view showing an external appearance of a particle detector provided in the air conditioner for a vehicle.

Fig. 3 is a view showing a section III-III of fig. 2.

Fig. 4 is a diagram showing the configuration of the particle detection unit and its vicinity in the vehicle air conditioner according to the second embodiment.

Fig. 5 is a diagram showing the configuration of the particle detection unit and its vicinity in the vehicle air conditioner according to the third embodiment.

Fig. 6 is a diagram showing the configuration of the particle detection unit and its vicinity in the vehicle air conditioner according to the fourth embodiment.

Fig. 7 is a diagram showing the configuration of the particle detection unit and its vicinity in the vehicle air conditioner of the fifth embodiment.

Detailed Description

The present embodiment will be described below with reference to the drawings. For the sake of easy understanding of the description, the same components are denoted by the same reference numerals as much as possible in the drawings, and redundant description is omitted.

A first embodiment will be described with reference to fig. 1 to 3. The air conditioner 10 for a vehicle according to the present embodiment is an air conditioner mounted on a vehicle (not shown in the drawings as a whole), and is a device for performing air conditioning in a vehicle interior. As shown in fig. 1, the air conditioner 10 for a vehicle includes an air conditioning unit 100 and a particle detector 200.

First, the structure of the air-conditioning unit 100 will be described. The air conditioning unit 100 is a main part of the air conditioning apparatus 10 for a vehicle, and air-conditions air taken in from the outside and supplies the air-conditioned air into the vehicle interior. Air conditioning unit 100 includes blower housing 101, blower 130, connection unit 140, and air conditioning unit 150.

The blower housing 101 is a portion of the vehicle air conditioner 10 into which air from the outside is taken. A blower 130 described later is housed inside the blower housing 101. The blower housing 101 is formed with an inside air inlet 111 and an outside air inlet 112. The inner air inlet 111 is an opening formed as an inlet for air introduced from the vehicle interior. The space in the vehicle interior is connected to the interior air inlet 111 by a duct, not shown. The outdoor air inlet 112 is an opening formed as an inlet for air introduced from the outside of the vehicle. The space outside the vehicle and outside air inlet 112 are also connected by a duct, not shown.

An inside/outside air switching door, not shown, is provided between the inside air inlet 111 and the outside air inlet 112 in the blower housing 101. The ratio of the air flowing from the inside air inlet 111 to the air flowing from the outside air inlet 112 is adjusted by the operation of the inside/outside air switching door. Since a known structure can be adopted as the structure of such an inside/outside air switching door, specific illustration and description thereof are omitted.

In the blower housing portion 101, a particulate filter 120 is disposed upstream (upward in fig. 1) of the blower 130 in the air flow direction. The particle filter 120 is a filter for removing particles from air flowing in from the inside air inlet 111 or the outside air inlet 112. By passing the air through the particle filter 120, the clean air with the reduced particle concentration is blown out into the vehicle interior.

The blower 130 is a blower for blowing air into the vehicle interior. When the blower 130 is driven, air is drawn into the blower housing 101 through the inside air inlet 111 or the outside air inlet 112. This air is blown into the vehicle interior through the following connection portion 140 and the air conditioner 150.

Connection unit 140 is a portion provided as a flow path connecting blower housing unit 101 and air conditioner unit 150. In the present embodiment, blower housing 101 and connecting portion 140 are integrally formed.

The air conditioner 150 is a part that adjusts the temperature of air. An evaporator for dehumidifying and cooling air, a heater core for heating air, an air mix door for adjusting the amount of air flowing through the evaporator and the heater core, and the like are disposed inside the air conditioning unit 150.

The air conditioner 150 is provided with a defroster outlet 151, a face outlet 152, and a foot outlet 153, respectively, at a portion downstream in the air flow direction. The defroster blowout part 151 is a part that blows out the conditioned air to the window of the vehicle. The face blowout part 152 is a part that blows out the air-conditioned air toward the face of the occupant of the vehicle. The foot blowing portion 153 is a portion that blows out the air-conditioned air to the foot of the occupant of the vehicle. The defroster blowout part 151, the face blowout part 152, and the foot blowout part 153 are provided with doors, not shown, respectively, and the flow rates of the air blown out from the blowout parts are adjusted according to the opening degrees of the doors. Since the configuration of the air conditioner 150 described above can be a known configuration, specific illustration and description thereof are omitted.

As shown in fig. 1, an air introduction chamber 160 is formed in the blower housing 101 at a position near the end of the particulate filter 120. The air introduction chamber 160 is formed as a space in which air introduced from the outside of the air conditioning unit 100 into the inside of the air conditioning unit 100 (specifically, the inside of the blower housing 101) flows.

An opening 161 serving as an air inlet in the air introduction chamber 160 is formed above the particle filter 120 and the particle detector 200 described later. The opening 161 communicates between the space around the air conditioning unit 100 and the air introduction chamber 160. An opening 162 serving as an air outlet in the air introduction chamber 160 is formed at a position slightly below the particle filter 120. The opening 162 communicates between the air introduction chamber 160 and a space below the particulate filter 120 in the blower housing 101. The positions of the

openings

161 and 162 described above are merely examples. The opening 161 and the opening 162 may be formed at different positions from those described above, respectively.

When blower 130 is driven, air in air introduction chamber 160 is discharged to blower 130 side through opening 162 by the suction force of blower 130. To compensate for this, external air flows into the air introduction chamber 160 through the opening 161. Therefore, in the air introduction chamber 160 of the present embodiment, air flows from a position (opening 161) above the first opening 220 toward the lower side.

The blower housing 101 is disposed inside the instrument panel in the vehicle. The space inside the instrument panel, i.e., the space outside the air introduction chamber 160 is connected to the vehicle interior. Therefore, the air flowing into the air introduction chamber 160 from the opening 161 is air in the vehicle interior.

As shown in fig. 1, a portion of the air conditioning unit 100 where the air introduction chamber 160 is formed is a portion where the particle detector 200 is mounted. Particle detection unit 200 is attached to blower housing unit 101 from the outside so as to define a lateral portion of air introduction chamber 160. The upper end of the particle detector 200 is located lower than the opening 161.

The particle detection unit 200 is a sensor unit for measuring the concentration of particles in the air. The particle detection unit 200 includes a light emitting unit and a light receiving unit, not shown, inside the casing 210 shown in fig. 2. A part of the light emitted from the light emitting section is scattered by the particles in the air introduced into the particle detecting section 200, and a part of the light is detected by the light receiving section. The particle detection unit 200 is configured to detect the presence or absence and concentration of particles in the air based on the amount of light detected by the light receiving unit. Since the configuration of the light emitting section and the light receiving section included in the particle detection section 200 can be a known configuration, illustration and specific description thereof are omitted.

The housing 210 is a container that accommodates the light emitting section, the light receiving section, and the like therein, and is formed in a substantially rectangular parallelepiped shape. A first opening 220 and a second opening 240 are formed in a surface of the case 210 that is attached to the blower housing 101 (i.e., a surface that defines the air introduction chamber 160).

The first opening 220 is an opening formed to allow air from the air introduction chamber 160 to flow in. The particle detector 200 measures the concentration of particles in the air flowing into the casing 210 through the first opening 220. As described above, this air is the air in the vehicle compartment.

As shown in fig. 2, an inflow guide 230 is provided around the first opening 220 in the case 210. The inflow guide part 230 protrudes from the edge of the first opening 220 toward the air introduction chamber 160 side, and is formed with an opening 231 at an upper end thereof. The edges of the opening 231 are substantially along a horizontal plane.

As described above, in the air introduction chamber 160, an air flow is generated from the upper side toward the lower side. Therefore, a part of the air is pushed into the opening 231 by the dynamic pressure and flows into the housing 210 from the first opening 220. The air is discharged from the second opening 240 to the air introduction chamber 160 after the particle concentration of the air is measured by the particle detector 200. The inflow guide part 230 may be formed in the case 210 so as to guide a part of the air flowing through the air introduction chamber 160 to the first opening 220.

As described above, the second opening 240 is an opening formed to discharge air into the air introduction chamber 160. The second opening 240 in the present embodiment is formed above the first opening 220.

However, in order to accurately measure the particle concentration by the particle detection unit 200, it is necessary to reduce the amount of air flowing into the inside of the housing 210 through a path not passing through the first opening 220 as much as possible. The "path that does not pass through the first opening 220" may be, for example, a path that passes through a gap between a plurality of members constituting the housing 210. Since the width of such a path is relatively narrow, when air passes through the path, a part of particles contained in the air may be filtered. That is, the air flowing into the inside of the casing 210 through the path not passing through the first opening 220 is air having a particle concentration smaller than that of the air in the vehicle interior. Therefore, when the amount of air flowing in through the path not passing through the first opening 220 increases, the measured value of the particle concentration is shifted to a lower side.

As shown in fig. 3, the housing 210 has a double structure including an inner wall 212 and an outer wall 211. In the present embodiment, the amount of air flowing into the inside of the housing 210 through the path not passing through the first opening 220 is reduced by making the housing 210 have a double structure. However, the air in the space between the inner wall 212 and the outer wall 211 passes through the gap as described above, and becomes air with a reduced particle concentration. When air flows into the inside from the part of the first opening 220, the particle concentration cannot be measured accurately.

Therefore, in the present embodiment, the blocking

walls

213, 214, 215, and 216 are formed in the vicinity of the first opening 220, thereby preventing the air between the inner wall 212 and the outer wall 211 from flowing inward from the first opening 220.

The blocking wall 213 is a wall formed to protrude from the outer wall 211 toward the inner wall 212 at a position as a lower end portion of the first opening 220. The blocking wall 214 is a wall formed to protrude from the inner wall 212 toward the outer wall 211 at a position as a lower end portion of the first opening 220. The blocking wall 213 and the blocking wall 214 are arranged in an upper-lower arrangement with a small gap therebetween. The blocking wall 213 and the blocking wall 214 function as a labyrinth structure for blocking the space between the inner wall 212 and the outer wall 211 and the first opening 220.

The blocking wall 215 is a wall formed to protrude from the outer wall 211 toward the inner wall 212 at a position as an upper end portion of the first opening 220. The blocking wall 216 is a wall formed to protrude from the inner wall 212 toward the outer wall 211 at a position as an upper end portion of the first opening 220. The blocking wall 215 and the blocking wall 216 are arranged in an upper-lower arrangement with a small gap therebetween. The blocking wall 215 and the blocking wall 215 also function as a labyrinth structure for blocking the space between the inner wall 212 and the outer wall 211 and the first opening 220.

The air between the inner wall 212 and the outer wall 211 is suppressed from flowing into the inside of the housing 210 through the first opening 220 by the labyrinth structure constituted by the blocking

walls

213, 214, 215, 216. As a result, the proportion of the air flowing into the housing 210 through the first opening 220 among the air flowing into the housing 210 increases, and thus the decrease in the measurement accuracy of the particle detector 200 can be suppressed.

In this way, the blocking

walls

213, 214, 215, and 216 serve as portions that suppress air from flowing into the housing 210 through the path that does not pass through the first opening 220, thereby improving the measurement accuracy of the particle detector 200. Such blocking

walls

213, 214, 215, and 216 (labyrinth structure) correspond to the "accuracy improving unit" in the present embodiment.

In the present embodiment, more air flows into the inside of the case 210 through the first opening 220 by providing the inflow guide part 230 described above. That is, by providing the inflow guide part 230, the ratio of the air flowing into the inside of the case 210 through the first opening 220 is also increased. Therefore, the inflow guide part 230 also functions as one of the "accuracy improving parts" in the present embodiment.

A second embodiment will be described with reference to fig. 4. Hereinafter, the points different from the first embodiment will be mainly described, and the description of the points common to the first embodiment will be appropriately omitted.

In the present embodiment, the top wall 171 that defines the upper side of the air introduction chamber 160 is formed to extend to a position facing the upper surface 201 of the housing 210. As a result, the first opening 220 and the inflow guide portion 230 of the housing 210 are covered by the top wall 171 from above.

Further, a protruding wall 172 is provided on the upper surface 201 of the housing 210. The protruding wall 172 is formed to protrude toward the upper top wall 171. However, a gap is formed between the top wall 171 and the protruding wall 172. The position of the projecting wall 172 formed in this manner can be a position in the middle of the flow path through which the air flows toward the first opening 220 along the top wall 171.

The effect of providing the top wall 171 and the protruding wall 172 will be described. In the particle detector 200, particles having a particle diameter of approximately 2.5 μm or less, which are referred to as "PM2.5", are to be detected. Therefore, when particles having a particle diameter larger than the above particle diameter (i.e., particles outside the object to be measured) are contained in the air flowing in from the first opening 220, the accuracy of measurement of the particle concentration in the particle detection unit 200 is lowered. Specifically, the particle concentration measured by the particle detector 200 is higher than the actual particle concentration.

However, since particles having a large particle diameter are more easily affected by gravity, they easily move (fall) downward in the air. In the present embodiment, the entirety of the first opening 220 and the inflow guide portion 230 is covered from above by the top wall 171. Therefore, since large-diameter particles falling from above the housing 210 are blocked by the top wall 171, it is difficult to directly flow into the first opening 220.

The air flowing toward the opening 161 between the top wall 171 and the upper surface 201 changes its flow direction upward by the protruding wall 172, and then flows toward the opening 161 again. Therefore, even if large-diameter particles are contained in the air, the particles cannot pass over the protruding wall 172, and thus it is difficult to reach the opening 161.

As described above, in the present embodiment, the top wall 171 and the protruding wall 172 suppress the flow of particles larger than the particles to be measured into the case 210. As a result, the decrease in measurement accuracy due to the large-diameter particles is suppressed. The top wall 171 and the protruding wall 172 correspond to the "accuracy improving unit" in the present embodiment.

In the present embodiment, since large-diameter particles are less likely to accumulate inside the housing 210, the effect of reducing the frequency of maintenance (cleaning) of the particle detection unit 200 can also be obtained. As described above, the detection of PM2.5 is merely an example. The particle concentration of the particle detector 200 may be measured by using particles other than PM2.5 as the detection target.

A third embodiment will be described with reference to fig. 5. Hereinafter, the points different from the second embodiment (fig. 4) will be mainly described, and the description of the points common to the second embodiment will be appropriately omitted.

In the present embodiment, the opening 161 of the air introduction chamber 160 is formed so as to open toward the back side and the near side (not shown) of the drawing sheet in fig. 5, rather than opening toward the left side (i.e., the case 210 side) in fig. 5. In the present embodiment, since large-diameter particles falling outside the air introduction chamber 160 are also blocked by the ceiling wall 171, they are difficult to flow directly into the first opening 220. In such an embodiment, the same effects as those described in the second embodiment are obtained.

A fourth embodiment will be described with reference to fig. 6. Hereinafter, description will be given mainly of points different from the second embodiment, and description of points common to the second embodiment will be appropriately omitted.

In the present embodiment, the entire housing 210 is attached in a state of being inclined in the direction toward the air introduction chamber 160. As a result, the surface 202 of the housing 210 on which the first opening 220 is formed is also inclined in the direction toward the air introduction chamber 160.

A broken line DL1 shown in fig. 6 is drawn to extend vertically downward from the upper end of the surface 202. The entire inflow guide portion 230 is disposed in a range closer to the surface 202 than the broken line DL 1.

As a result, the portion of the case 210 (surface 202) above the first opening 220 covers the first opening 220 and the inflow guide portion 230 from above. Therefore, the large-diameter particles falling outside the air introduction chamber 160 are blocked by the inclined surface 202 as described above, and thus are difficult to directly flow into the first opening 220. As a result, the decrease in measurement accuracy due to the large-diameter particles can be suppressed. In this way, the portion of the case 210 (surface 202) above the first opening 220 corresponds to the "accuracy improving portion" of the present embodiment.

A fifth embodiment will be described with reference to fig. 7. Hereinafter, description will be given mainly of points different from the second embodiment, and description of points common to the second embodiment will be appropriately omitted.

In the present embodiment, the opening 161, which is an inlet for air of the air introduction chamber 160, is formed at a position that is a lower end of the air introduction chamber 160. Therefore, in the vicinity of the case 210 in the air introduction chamber 160, the air flows from the lower side toward the upper side. The inflow guide 230 of the present embodiment is formed in a state in which the opening 231 is directed downward so that a part of the air flows into the inside of the housing 210 from the first opening 220.

In such a configuration, particles having a large diameter other than the measurement target are more difficult to reach the first opening 220 from the opening 161. As a result, the decrease in measurement accuracy due to the large-diameter particles is suppressed.

However, in the present embodiment, both the opening 161 and the opening 162 are formed near the lower end portion of the air introduction chamber 160. Therefore, as shown by an arrow AR3 in fig. 7, the air flowing in from the opening 161 may be discharged from the opening 162 without going toward the first opening 220.

Here, in the present embodiment, in order to prevent the air from flowing through the above-described path, a guide wall 173 is provided inside the air introduction chamber 160. The guide wall 173 is a wall formed to extend from a portion of an edge of the opening 161 on the side opposite to the housing 210 (on the right side in fig. 7) to a position higher than the first opening 220. The air flowing into the air introduction chamber 160 from the opening 161 is guided to a position higher than the first opening 220 by the guide wall 173. As a result, since the flow of air near the first opening 220 is ensured, a part of the air easily flows into the inside of the first opening 220. The guide wall 173 that guides the air containing no large-diameter particles to the first opening 220 corresponds to the "accuracy improving portion" of the present embodiment. In such an embodiment, the same effects as those described in the second embodiment are obtained.

The vehicle air conditioner 10 may be provided with only one or both of the accuracy improving section (for example, the inflow guide section 230 of the first embodiment) for suppressing the inflow of air into the interior of the casing 210 through the path not passing through the first opening 220 and the accuracy improving section (for example, the ceiling wall 171 of the second embodiment) for suppressing the inflow of particles larger than the particles to be measured from the first opening 220 into the interior of the casing 210.

The present embodiment has been described above with reference to specific examples. However, the present invention is not limited to these specific examples. It is to be noted that the present invention is not limited to the above-described embodiments, and various modifications and changes can be made without departing from the scope of the present invention. The elements, the arrangement, conditions, shapes, and the like of the specific examples are not limited to those illustrated in the drawings, and may be appropriately modified. The combination of the elements included in the specific examples can be changed as appropriate without causing any technical contradiction.

Claims

1. An air conditioning device (10) for a vehicle, characterized by comprising:

an air conditioning unit (100) that supplies air conditioned air into a vehicle interior; and

a particle detection unit (200) that measures the concentration of particles in the air,

an air introduction chamber (160) is formed in a portion of the air conditioning unit where the particle detection unit is attached, the air introduction chamber being a space in which air introduced to the inside of the air conditioning unit flows,

the particle detection unit has a housing (210) in which a first opening (220) through which air from the air introduction chamber flows and a second opening (240) through which air is discharged into the air introduction chamber are formed, and is configured to measure the concentration of the particles in the air flowing into the housing from the first opening,

the air conditioner for a vehicle further includes an accuracy improving unit that improves measurement accuracy of the particle detecting unit by suppressing air from flowing into the casing through a path that does not pass through the first opening,

the accuracy improving section is configured to improve a ratio of air flowing into the housing through the first opening among air flowing into the housing,

the housing is a double structure consisting of an inner wall (212) and an outer wall (211),

the accuracy improving portion is a labyrinth structure (213, 214, 215, 216) formed in the vicinity of the first opening to suppress the air between the inner wall and the outer wall from flowing into the inside of the housing.

2. An air conditioning device (10) for a vehicle, characterized by comprising:

the vehicle air conditioner further includes a precision increasing unit that increases the measurement precision of the particle detecting unit by suppressing particles larger than particles to be measured from flowing into the casing from the first opening,

the air introduction chamber is configured such that air flows from a position above the first opening toward a lower side,

the accuracy improving portion has a top wall (171) provided to cover the first opening from above.

3. An air conditioning device for a vehicle according to claim 2,

the accuracy improving section further has a protruding wall (172) provided so as to protrude upward in the middle of the flow path in which the air flows along the top wall toward the first opening.

4. An air conditioning device for a vehicle according to claim 3,

the protruding wall (172) protrudes from an upper surface (201) of the housing (210) toward the top wall (171), and a gap is formed between the top wall (171) and a tip end of the protruding wall (172).

5. An air conditioning device (10) for a vehicle, characterized by comprising:

the air introduction chamber is configured such that air flows from a position below the first opening to an upper side,

the accuracy improving section has a guide wall (173) provided to guide the air flowing into the air introduction chamber to a position higher than the first opening.

6. An air conditioning device (10) for a vehicle, characterized by comprising:

a labyrinth structure (213, 214, 215, 216) is formed in the vicinity of the first opening to inhibit air between the inner and outer walls from flowing into the interior of the housing.