WO2019021682A1 - Vehicular air conditioner - Google Patents

Abstract

A vehicular air conditioner (10) comprises an air conditioning unit (100) and a particle detection unit (200). An air introducing chamber (160), which is a space through which air introduced to the inside of the air conditioning unit flows, is formed in a portion of the air conditioning unit to which the particle detection unit is attached. The particle detection unit has a case (210) in which a first opening (220) into which air from the air introducing chamber flows and a second opening (240) through which the air is discharged into the air introducing chamber are formed. The vehicular air conditioner further comprises an accuracy improving unit (171) that improves the accuracy of measurement performed by the particle detection unit by suppressing at least one of the inflow of air into the case through a path not passing through the first opening and the inflow of particles larger than the particles to be measured into the case from the first opening.

Description

Vehicle air conditioner Cross-reference to related applications

This application is based on Japanese Patent Application No. 201 746619 filed on July 28, 2017, and claims the benefit of its priority, and the entire contents of the patent application are: Incorporated herein by reference.

The present disclosure relates to a vehicle air conditioner

The vehicle air conditioner adjusts the temperature of air taken in from the vehicle interior or the outside of the vehicle, and blows out the temperature-controlled air (that is, conditioned air) toward the vehicle interior. The temperature control of air is performed by a heater core or an evaporator in the air conditioning unit as described in, for example, Patent Document 1 below.

JP 2008-24032 A

The inventors of the present invention have been studying about providing a vehicle air conditioner with a function of measuring the concentration of particles (for example, PM 2.5) suspended in the air. For example, the vehicle air conditioner is provided with a particle detection unit that optically measures particle concentration, and a part of the air drawn into the air conditioning unit from the vehicle compartment flows through the particle detection unit. Then, it becomes possible to measure the particle concentration in the air in the vehicle compartment.

It is preferable that the air in the vehicle interior to be measured is supplied as it is to the particle detection unit without changing the particle concentration. However, according to the results confirmed by the present inventors through experiments etc., there is a new problem that the measurement accuracy of the particle concentration may be deteriorated depending on the shape of the air flow passage in the vicinity of the particle detection unit. It was issued.

For example, in the case of the particle detection unit, an opening which is an inlet of the air to be measured is formed, but in the case, a location different from the opening (for example, a gap formed in a connection portion of a component) Etc.) may also flow in. The particle concentration of the air tends to decrease as it passes through the gap. For this reason, when the amount of air flowing from the gap increases, the particle concentration measured by the particle detection unit becomes lower than the actual particle concentration.

In addition, even when most of the air flows into the case from the opening, the measurement accuracy of the particle concentration may decrease. For example, when particles larger than the particles to be measured are contained in the air, the particle concentration measured by the particle detection unit becomes higher than the actual particle concentration.

An object of the present disclosure is to provide a vehicle air conditioner capable of measuring the concentration of particles in the air with high accuracy.

A vehicle air conditioner according to the present disclosure includes an air conditioning unit that supplies conditioned air into a vehicle cabin, and a particle detection unit that measures the concentration of particles in the air. An air introduction chamber, which is a space through which the air introduced into the air conditioning unit flows, is formed in a portion of the air conditioning unit to which the particle detection unit is attached. The particle detection unit has a case in which a first opening through which air from the air introduction chamber flows in and a second opening through which the air is discharged into the air introduction chamber are formed, respectively, from the first opening It is configured to measure the concentration of particles in the air flowing into the inside of the case. In this vehicle air conditioner, air flows into the inside of the case along a path not passing through the first opening, and particles larger than the particles to be measured flow into the inside of the case from the first opening. It further includes an accuracy improvement unit that improves the accuracy of measurement by the particle detection unit by suppressing at least one of the two.

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

The vehicle air conditioner includes a precision improvement unit for improving the accuracy of measurement by the particle detection unit. The accuracy improvement portion includes at least the flow of air into the case through the first opening, and the flow of particles larger than the particles to be measured into the case from the first opening. It is to suppress one. In such a vehicular air-conditioning system, since the reduction in measurement accuracy is prevented by the accuracy improvement unit, it is possible to measure the particle concentration in the air with high accuracy.

According to the present disclosure, a vehicle air conditioner capable of measuring the concentration of particles in the air with high accuracy is provided.

FIG. 1 is a view schematically showing a configuration of a vehicle air conditioner according to the first embodiment. FIG. 2 is a perspective view showing an appearance of a particle detection unit provided in the vehicle air conditioner. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. FIG. 4 is a view showing the configuration of a particle detection unit and the vicinity thereof in the vehicle air conditioner according to the second embodiment. FIG. 5 is a view showing the configuration of a particle detection unit and the vicinity thereof in the vehicle air conditioner according to the third embodiment. FIG. 6 is a view showing the configuration of a particle detection unit and the vicinity thereof in the vehicle air conditioner according to the fourth embodiment. FIG. 7 is a view showing the configuration of a particle detection unit and the vicinity thereof in the vehicle air conditioner according to the fifth embodiment.

Hereinafter, the present embodiment will be described with reference to the attached drawings. In order to facilitate understanding of the description, the same constituent elements in the drawings are denoted by the same reference numerals as much as possible, and redundant description will be omitted.

The first embodiment will be described with reference to FIGS. 1 to 3. The vehicle air conditioner 10 which concerns on this embodiment is an air conditioner mounted in a vehicle (the whole is not shown), Comprising: It is an apparatus for air-conditioning a vehicle interior. As shown in FIG. 1, the vehicle air conditioner 10 includes an air conditioning unit 100 and a particle detection unit 200.

First, the configuration of the air conditioning unit 100 will be described. The air conditioning unit 100 is a main part of the vehicle air conditioner 10, and performs air conditioning of air taken from the outside, and supplies the conditioned air to the vehicle interior. The air conditioning unit 100 includes a blower storage unit 101, a blower 130, a connection unit 140, and an air conditioning unit 150.

The blower storage portion 101 is a portion for taking in air from the outside in the vehicle air conditioner 10. A blower 130, which will be described later, is housed inside the blower housing portion 101. In the blower housing portion 101, an inside air inlet 111 and an outside air inlet 112 are formed. The inside air inlet 111 is an opening formed as an inlet of air introduced from the vehicle compartment. The space in the passenger compartment and the inside air inlet 111 are connected by a duct (not shown). The fresh 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 the 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 storage portion 101. By the operation of the inside / outside air switching door, the ratio of the air flowing in from the inside air inlet 111 to the air flowing in from the outside air inlet 112 is adjusted. In addition, since a well-known thing can be employ | adopted as a structure of such an inside-and-outside air switching door, it abbreviate | omits about the specific illustration and description.

A particle filter 120 is disposed at a position on the blower storage portion 101 that is on the upstream side (upper side in FIG. 1) than the blower 130 along the air flow direction. The particle filter 120 is a filter for removing particles from the air flowing in from the inside air inlet 111 and the outside air inlet 112. The air passes through the particle filter 120 to blow clean air of reduced particle concentration into the passenger compartment.

The blower 130 is a blower that sends out air so as to be blown out into the vehicle compartment. When the blower 130 is driven, air is drawn into the blower storage unit 101 from the inside air inlet 111 and the outside air inlet 112. The air is blown out into the vehicle compartment through the connection unit 140 and the air conditioning unit 150 which will be described next.

The connection portion 140 is a portion provided as a flow path connecting the blower housing portion 101 and the air conditioning portion 150. In the present embodiment, the blower storage portion 101 and the connection portion 140 are integrally formed.

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

A defroster blowout unit 151, a face blowout unit 152, and a foot blowoff unit 153 are provided in a portion of the air conditioning unit 150 that is on the downstream side along the air flow direction. The defroster blowout unit 151 is a portion that blows the conditioned air toward the window of the vehicle. The face blowing portion 152 is a portion that blows the conditioned air toward the face of the vehicle occupant. The foot blowing portion 153 is a portion that blows the conditioned air toward the feet of the vehicle occupant. A door (not shown) is provided in each of the defroster blowout portion 151, the face blowout portion 152, and the foot blowout portion 153, and the flow rate of air blown out from each blowout portion is adjusted according to the opening degree of the door. In addition, since a well-known thing can be employ | adopted as a structure of the air-conditioning part 150 which was demonstrated above, it abbreviate | omits about the specific illustration and description.

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

The opening 161 serving as the air inlet of the air introduction chamber 160 is formed at a position above the particle filter 120 and a particle detection unit 200 described later. The opening 161 communicates the space around the air conditioning unit 100 with the air introduction chamber 160. An opening 162 serving as an outlet of air in the air introduction chamber 160 is formed at a position slightly below the particle filter 120. The opening 162 communicates the air introduction chamber 160 with the space of the blower housing portion 101 below the particle filter 120. The positions of the openings 161 and the openings 162 as described above are merely examples. The opening 161 and the opening 162 may be formed at positions different from the above.

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

The blower storage portion 101 is disposed inside the instrument panel of the vehicle. The space inside the instrument panel, that is, 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 the air in the vehicle compartment.

As shown in FIG. 1, a portion of the air conditioning unit 100 in which the air introduction chamber 160 is formed is a portion to which the particle detection unit 200 is attached. The particle detection unit 200 is attached to the blower storage unit 101 from the outside so as to divide the side portion of the air introduction chamber 160. The position of the upper end of the particle detection unit 200 is 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 has a light emitting unit and a light receiving unit (not shown) inside the case 210 shown in FIG. A part of the light emitted from the light emitting part is scattered by the particles in the air introduced into the inside of the particle detecting part 200, and the part is detected by the light receiving part. 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 reception unit. In addition, since a well-known thing can be employ | adopted as a structure of the light emission part which the particle | grain detection part 200 has, and a light reception part, it abbreviate | omits about the illustration and concrete description.

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

The first opening 220 is an opening formed to receive air from the air introduction chamber 160. The particle detection unit 200 measures the concentration of particles in the air that has flowed into the case 210 through the first opening 220. The air is, as already mentioned, the air in the passenger compartment.

As shown in FIG. 2, an inflow guide portion 230 is provided around the first opening 220 in the case 210. The inflow guide portion 230 protrudes from the edge of the first opening 220 toward the air introduction chamber 160, and an opening 231 is formed at the upper end thereof. The edge of the opening 231 is generally along the horizontal plane.

As described above, in the air introduction chamber 160, a flow of air from the upper side to the lower side is generated. For this reason, a part of the air is pushed into the inside of the opening 231 by the dynamic pressure, and flows into the inside of the case 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 is measured by the particle detection unit 200. It can be said that such an inflow guide portion 230 is 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.

The second opening 240 is an opening formed for discharging air to the air introduction chamber 160 as described above. The second opening 240 in the present embodiment is formed at a position above the first opening 220.

By the way, 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 case 210 along the path not passing through the first opening 220 as much as possible. The “path not passing through the first opening 220” may be, for example, a path that passes through a gap between a plurality of parts constituting the case 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 that has flowed into the inside of the case 210 along the path that does not pass through the first opening 220 is air having a particle concentration smaller than that of the air in the vehicle compartment. For this reason, if the amount of air flowing in along the path not passing through the first opening 220 is increased, the measured value of the particle concentration will be shifted to the lower side.

As shown in FIG. 3, the case 210 has a double structure including an inner wall 212 and an outer wall 211. In the present embodiment, by forming the case 210 in a double structure, the amount of air flowing into the inside of the case 210 along the path not passing through the first opening 220 is reduced. However, the air in the space between the inner wall 212 and the outer wall 211 is air that has passed through the gap as described above, and is air with a reduced particle concentration. If such air flows inward from the portion of the first opening 220, accurate particle concentration measurement can not be performed again.

Therefore, in the present embodiment, by forming the blocking walls 213, 214, 215, and 216 in the vicinity of the first opening 220, the air between the inner wall 212 and the outer wall 211 flows inward from the first opening 220. To prevent it from

The blocking wall 213 is a wall formed to project from the outer wall 211 toward the inner wall 212 at a position that is the lower end portion of the first opening 220. The blocking wall 214 is a wall formed to project from the inner wall 212 toward the outer wall 211 at a position to be a lower end portion of the first opening 220. The blocking wall 213 and the blocking wall 214 are arranged vertically, and the gap between them is small. 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 project from the outer wall 211 toward the inner wall 212 at a position to be the upper end of the first opening 220. The blocking wall 216 is a wall formed to project from the inner wall 212 toward the outer wall 211 at a position to be the upper end of the first opening 220. The blocking wall 215 and the blocking wall 216 are arranged vertically, and the gap between them is small. 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 labyrinth structure formed of the blocking walls 213, 214, 215, 216 prevents the air between the inner wall 212 and the outer wall 211 from flowing into the inside of the case 210 through the first opening 220. As a result, the ratio of the air flowing into the inside of the case 210 through the first opening 220 among the air flowing into the inside of the case 210 is improved, so that the decrease in measurement accuracy by the particle detection unit 200 is suppressed. .

As described above, the blocking walls 213, 214, 215, and 216 are portions that suppress the flow of air into the inside of the case 210 along the path that does not pass through the first opening 220 and improve the accuracy of the measurement by the particle detection unit 200. It has become. Such blocking walls 213, 214, 215, 216 (labyrinth structure) correspond to the "accuracy improving portion" in the present embodiment.

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

The second embodiment will be described with reference to FIG. In the following, differences from the first embodiment will be mainly described, and descriptions of points in common with the first embodiment will be omitted as appropriate.

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

Further, a projecting wall 172 is provided on the top surface 201 of the case 210. The projecting wall 172 is formed to project toward the upper ceiling 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 said to be an intermediate position of the flow path along which the air flows toward the first opening 220 along the top wall 171.

The effect of the top wall 171 and the protruding wall 172 being provided will be described. The particle detection unit 200 detects particles called “PM 2.5” whose particle diameter is approximately 2.5 μm or less. For this reason, when air having a larger particle diameter than the above (that is, particles not to be measured) is included in the air flowing in from the first opening 220, the measurement accuracy of the particle concentration by the particle detection unit 200 is It will decrease. Specifically, the particle concentration measured by the particle detection unit 200 is higher than the actual particle concentration.

However, since particles having a large particle size are more susceptible to the influence of gravity, they tend to move (drop) downward in the air. In the present embodiment, the whole of the first opening 220 and the inflow guide portion 230 is covered by the top wall 171 from above. For this reason, the large diameter particles falling from the upper side of the case 210 are blocked by the top wall 171, and thus are difficult to flow directly into the first opening 220.

Further, the air flowing between the top wall 171 and the upper surface 201 toward the opening 161 changes the flow direction upward by the protruding wall 172, and then flows again toward the opening 161. For this reason, even if the air contains particles of large diameter, the particles can not get over the projecting wall 172, and therefore, it is difficult for the particles to reach the opening 161.

As described above, in the present embodiment, the flow of particles larger than the particles to be measured into the inside of the case 210 is suppressed by the top wall 171 and the protruding wall 172, respectively. As a result, the decrease in measurement accuracy due to the large diameter particles is suppressed. Such top wall 171 and projecting wall 172 correspond to the “accuracy improving portion” in the present embodiment.

Further, in the present embodiment, since it is difficult for particles of a large diameter to be deposited inside the case 210, an effect of reducing the frequency of maintenance (cleaning) of the particle detection unit 200 can be obtained. In addition, it is an example to the last to make PM2.5 into a detection target as mentioned above. The measurement of the particle concentration by the particle detection unit 200 may be performed on particles other than PM 2.5 as a detection target.

The third embodiment will be described with reference to FIG. In the following, points different from the second embodiment (FIG. 4) described above will be mainly described, and the description in common with the second embodiment will be omitted as appropriate.

In the present embodiment, the opening 161 of the air introduction chamber 160 is not formed to open toward the left side (that is, the case 210 side) in FIG. It is formed to open toward the illustration). Also in the present embodiment, the large-diameter particles falling outside the air introduction chamber 160 are blocked by the top wall 171, and thus are difficult to directly flow into the first opening 220. Even in such a mode, the same effects as those described in the second embodiment can be obtained.

The fourth embodiment will be described with reference to FIG. In the following, differences from the second embodiment will be mainly described, and descriptions of points in common with the second embodiment will be omitted as appropriate.

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

The dotted line DL1 shown in FIG. 6 is a line 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 dotted line DL1.

As a result, a 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. For this reason, since the large diameter particles falling outside the air introduction chamber 160 are blocked by the inclined surface 202 as described above, it is difficult to flow directly into the first opening 220. As a result, the decrease in measurement accuracy due to the large diameter particles is suppressed. Thus, the portion on the upper side of the first opening 220 in the case 210 (surface 202) corresponds to the “accuracy improving portion” in the present embodiment.

The fifth embodiment will be described with reference to FIG. In the following, differences from the second embodiment will be mainly described, and descriptions of points in common with the second embodiment will be omitted as appropriate.

In the present embodiment, an opening 161 which is an inlet of air in the air introduction chamber 160 is formed at a position to be the 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 to the upper side. The inflow guide portion 230 in the present embodiment is formed with the opening 231 directed downward so that a part of the air flows into the inside of the case 210 from the first opening 220.

In such a configuration, it is more difficult for large diameter particles that are not to be measured 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.

In the present embodiment, both the opening 161 and the opening 162 are formed in the vicinity of the lower end portion of the air introduction chamber 160. For this reason, as shown by arrow AR3 in FIG. 7, the air which flowed in from opening 161 may be discharged from opening 162 without going to first opening 220.

So, in this embodiment, in order to prevent that air flows along the above routes, the 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 the edge of the opening 161 opposite to the case 210 (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 such a guide wall 173. As a result, since the flow of air in the vicinity of the first opening 220 is secured, a part of the air is likely to flow into the inside of the first opening 220. The guide wall 173 which guides the air containing no large-diameter particles to the first opening 220 corresponds to the “accuracy improving portion” in the present embodiment. Even in such a mode, the same effects as those described in the second embodiment can be obtained.

A precision improvement portion (for example, the inflow guide portion 230 or the like according to the first embodiment) for suppressing air from flowing into the case 210 along a path not passing through the first opening 220, and particles larger than particles to be measured In the vehicle air conditioner 10, only one of the accuracy improving parts (for example, the top wall 171 and the like of the second embodiment) for suppressing the flow of the air into the inside of the case 210 from the first opening 220 is provided. Or both may be provided.

The present embodiment has been described above with reference to the specific example. However, the present disclosure is not limited to these specific examples. Those appropriately modified in design by those skilled in the art are also included in the scope of the present disclosure as long as the features of the present disclosure are included. The elements included in the above-described specific examples, and the arrangement, conditions, and shapes thereof are not limited to those illustrated, but can be appropriately modified. The elements included in the above-described specific examples can be appropriately changed in combination as long as no technical contradiction arises.

Claims (9)

A vehicle air conditioner (10),
An air conditioning unit (100) for supplying conditioned air into the vehicle compartment;
A particle detector (200) for measuring the concentration of particles in the air;
An air introduction chamber (160), which is a space through which the air introduced into the air conditioning unit flows, is formed in a portion of the air conditioning unit to which the particle detection unit is attached.
The particle detection unit has a case in which a first opening (220) into which the air from the air introduction chamber flows and a second opening (240) into which the air is discharged to the air introduction chamber are formed. 210) and is configured to measure the concentration of the particles in the air flowing into the interior of the case from the first opening,
At least one of air flowing into the inside of the case along a path not passing through the first opening, and particles larger than particles to be measured flowing into the inside of the case from the first opening; An air conditioning system for a vehicle, further comprising a precision improvement unit (171, 172, 173, 202, 213, 214, 215, 216, 230) that improves the accuracy of measurement by the particle detection unit by suppressing. The accuracy improvement unit
The vehicle air conditioner according to claim 1, wherein the ratio of the air flowing into the inside of the case through the first opening to the air flowing into the inside of the case is improved. The accuracy improvement unit
The air conditioner for vehicles according to claim 2 which is an inflow guide part (230) formed in said case so that a part of air which flows through said air introduction room may be introduced to said 1st opening. The case has a double structure consisting of an inner wall (212) and an outer wall (211),
The accuracy improvement unit
Claim: A labyrinth structure (213, 214, 215, 216) formed in the vicinity of the first opening to inhibit the air between the inner wall and the outer wall from flowing into the inside of the case. Vehicle air conditioner according to 2. The accuracy improvement unit
The vehicle air conditioner according to claim 1, configured to suppress that particles larger than the particles to be measured flow into the inside of the case from the first opening. The air introduction chamber is configured such that air flows downward from a position above the first opening,
The air conditioner for vehicles according to claim 5 with which said accuracy improvement part has a ceiling wall (171) provided so that said 1st opening might be covered from the upper part. The precision improvement portion further includes a projecting wall (172) provided to project upward in the middle of a flow path along which the air flowing toward the first opening flows along the ceiling wall. The vehicle air conditioner according to 6. The portion of the case above the first opening of the case functions as the accuracy improving portion,
The vehicle air conditioner according to claim 5, wherein a surface (202) of the case in which the first opening is formed is inclined toward the air introduction chamber. The air introduction chamber is configured such that air flows upward from a position below the first opening,
The air conditioning system for vehicles according to claim 5, wherein said precision improvement part has a guide wall (173) provided so that the air which flowed into said air introduction room may be led to a position higher than said 1st opening.

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