JP6791049B2 - Vehicle air conditioner - Google Patents

Description

The present disclosure relates to a vehicle air conditioner.

The vehicle air conditioner regulates the temperature of the air taken in from the inside of the vehicle or the outside of the vehicle, and blows out the air after the temperature adjustment (that is, the air conditioner air) toward the inside of the vehicle. The temperature of the air is controlled by a heater core or an evaporator in the air conditioning unit, for example, as described in Patent Document 1 below.

JP-A-2008-24032

The present inventors are studying the provision of a function of measuring the concentration of particles floating in the air (for example, PM2.5) to a vehicle air conditioner. For example, the vehicle air conditioner is provided with a particle detector that optically measures the particle concentration, and a part of the air drawn into the air conditioner unit from the vehicle interior flows through the particle detector. Then, it becomes possible to measure the particle concentration in the air inside the vehicle interior.

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

For example, the case of the particle detector has an opening that is an inlet for the air to be measured, but the case has a gap that is different from the opening (for example, a gap formed in the connecting portion of the component). Air may also flow in from (etc.). The particle concentration of the air tends to decrease as it passes 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 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 detector becomes higher than the actual particle concentration.

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

The vehicle air conditioner (10) according to the present disclosure includes an air conditioner unit (100) that supplies air-conditioned air into the vehicle interior, and a particle detection unit (200) that measures the concentration of particles in the air. An air introduction chamber (160), which is a space through which air introduced into the air conditioning unit flows, is formed in a portion of the air conditioning unit to which a 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 introduction chamber flows in and a second opening (240) in which air is discharged into the air introduction chamber are formed. It has and is configured to measure the concentration of particles in the air that has flowed into the inside of the case from the first opening. In this vehicle air conditioner, air flows into the case through a path that does not pass through the first opening, and particles larger than the particles to be measured flow into the inside of the case through the first opening. By suppressing at least one of them, an accuracy improving unit for improving the accuracy of measurement by the particle detecting unit is further provided. The accuracy improving unit is configured to improve the proportion of the air flowing into the inside of the case through the first opening among the air flowing into the inside of the case, and the case has an inner wall (212) and an outer wall. It has a double structure consisting of (211), and the accuracy improving portion is formed in the vicinity of the first opening so as to prevent the air between the inner wall and the outer wall from flowing into the inside of the case. It has a labyrinth structure (213,214,215,216).

In a vehicle air conditioner having such a configuration, for example, by operating a fan included in the air conditioner unit, air from the surrounding space is introduced into the inside of the air conditioner unit through the air introduction chamber. The particle detection unit takes in 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 vehicle air conditioner includes an accuracy improving unit for improving the accuracy of measurement by the particle detecting unit. The accuracy improving unit is at least one of the fact that air flows into the case through a path that does not pass through the first opening and that particles larger than the particles to be measured flow into the inside of the case through the first opening. It suppresses one side. In such a vehicle air conditioner, the decrease in measurement accuracy is prevented by the accuracy improving unit, so that the particle concentration in the air can be measured with high accuracy.

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

FIG. 1 is a diagram schematically showing a configuration of a vehicle air conditioner according to the first embodiment. FIG. 2 is a perspective view showing the appearance of the particle detection unit included in the vehicle air conditioner. FIG. 3 is a diagram showing a cross section III-III of FIG. FIG. 4 is a diagram showing a configuration of a particle detection unit and its vicinity in the vehicle air conditioner according to the second embodiment. FIG. 5 is a diagram showing a configuration of a particle detection unit and its vicinity in the vehicle air conditioner according to the third embodiment. FIG. 6 is a diagram showing a configuration of a particle detection unit and its vicinity in the vehicle air conditioner according to the fourth embodiment. FIG. 7 is a diagram showing a configuration of a particle detection unit and its vicinity in the vehicle air conditioner according to the fifth embodiment.

Hereinafter, the present embodiment will be described with reference to the accompanying drawings. In order to facilitate understanding of the description, the same components are designated by the same reference numerals as much as possible in each drawing, and duplicate description is omitted.

The first embodiment will be described with reference to FIGS. 1 to 3. The vehicle air conditioner 10 according to the present embodiment is an air conditioner mounted on a vehicle (not shown as a whole) and is a device for air-conditioning the interior of the vehicle. As shown in FIG. 1, the vehicle air conditioner 10 includes an air conditioner 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, which air-conditions the air taken in from the outside and supplies the air-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 of the vehicle air conditioner 10 that takes in air from the outside. A blower 130, which will be described later, is housed inside the blower storage unit 101. The blower accommodating portion 101 is formed with an inside air inlet 111 and an outside air inlet 112. The inside air inlet 111 is an opening formed as an inlet for air introduced from the vehicle interior. The space inside the vehicle and the inside air inlet 111 are connected by a duct (not shown). The outside 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).

Of the blower storage unit 101, an inside / outside air switching door (not shown) is provided between the inside air inlet 111 and the outside air inlet 112. The ratio of the air flowing in from the inside air inlet 111 and the air flowing in from the outside air inlet 112 is adjusted by the operation of the inside / outside air switching door. As a configuration of such an inside / outside air switching door, a known one can be adopted, and therefore the specific illustration and description thereof will be omitted.

The particle filter 120 is arranged in the blower accommodating portion 101 at a position on the upstream side (upper side in FIG. 1) of 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. When the air passes through the particle filter 120, clean air having a reduced particle concentration is blown into the vehicle interior.

The blower 130 is a blower device that blows out air so as to be blown into the vehicle interior. When the blower 130 is driven, air is drawn into the blower accommodating portion 101 from the inside air inlet 111 and the outside air inlet 112. The air is blown into the vehicle interior through the connection unit 140 and the air conditioning unit 150 described below.

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

The air conditioning unit 150 is a portion that controls the temperature of air. Inside the air conditioning unit 150, 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 each of the evaporator and the heater core, and the like are arranged.

A defroster blowout section 151, a face blowout section 152, and a foot blowout section 153 are provided in each of the air conditioning sections 150 on the downstream side along the air flow direction. The defroster blowing portion 151 is a portion that blows air conditioning air toward the window of the vehicle. The face blowing portion 152 is a portion that blows air-conditioning air toward the face of a vehicle occupant. The foot blowing portion 153 is a portion that blows air-conditioned air toward the feet of the occupants of the vehicle. Doors (not shown) are 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 from each blowout portion is adjusted by the opening degree of the door. Since a known structure of the air conditioning unit 150 as described above can be adopted, specific illustrations and explanations thereof will be omitted.

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

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

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

The blower storage unit 101 is arranged 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 interior.

As shown in FIG. 1, the 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 partition a 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 unit is scattered by the particles in the air introduced into the particle detection unit 200, and a part of the light is further detected by the light receiving unit. The particle detection unit 200 is configured to detect the presence / absence and concentration of particles in the air based on the amount of light detected by the light receiving unit. Since known configurations of the light emitting unit and the light receiving unit of the particle detection unit 200 can be adopted, the illustration and specific description thereof will be omitted.

The case 210 is a container that houses the light emitting portion, the light receiving portion, and the like, and is formed in a substantially rectangular parallelepiped shape. A first opening 220 and a second opening 240 are formed on the surface of the case 210 that is attached to the blower storage portion 101 (that is, the surface that partitions the air introduction chamber 160).

The first opening 220 is an opening formed so that air from the air introduction chamber 160 flows in. The particle detection unit 200 measures the concentration of particles in the air that has flowed into the inside of the case 210 through the first opening 220. The air is the air inside the vehicle as described above.

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

As already described, in the air introduction chamber 160, an air flow from the upper side to the lower side is generated. Therefore, 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 for the particle concentration unit 200 to accurately measure the particle concentration, it is necessary to reduce the amount of air flowing into the inside of the case 210 through a path that does not pass through the first opening 220 as much as possible. Examples of the “path that does not pass through the first opening 220” include 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, some of the particles contained in the air may be filtered when the air passes through the path. That is, the air that has flowed into the inside of the case 210 through the path that does not pass through the first opening 220 is air having a smaller particle concentration than the air in the vehicle interior. Therefore, if the amount of air that flows in through the path that does not pass through the first opening 220 becomes large, the measured value of the particle concentration will shift 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, the case 210 has a double structure to reduce the amount of air flowing into the inside of the case 210 through a path that does not pass through the first opening 220. However, the air in the space between the inner wall 212 and the outer wall 211 is the air that has passed through the gap as described above, and the air has a reduced particle concentration. If such air flows inward from the portion of the first opening 220, accurate particle concentration measurement cannot be performed.

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. It prevents it from happening.

The blocking wall 213 is a wall formed so as to project from the outer wall 211 toward the inner wall 212 at a position at the lower end of the first opening 220. The barrier wall 214 is a wall formed so as to project from the inner wall 212 toward the outer wall 211 at a position at the lower end of the first opening 220. The barrier wall 213 and the barrier wall 214 are arranged so as to be arranged vertically, and the gap between the two is small. Such a 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 so as to project from the outer wall 211 toward the inner wall 212 at a position at the upper end of the first opening 220. The blocking wall 216 is a wall formed so as to project from the inner wall 212 toward the outer wall 211 at a position at the upper end of the first opening 220. The barrier 215 and the barrier 216 are arranged so as to be arranged vertically, and the gap between the two is small. Such a 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 including the barrier walls 213, 214, 215, and 216 prevents the air between the inner wall 212 and the outer wall 211 from flowing into the case 210 through the first opening 220. As a result, the proportion of the air flowing into the case 210 through the first opening 220 of the air flowing into the case 210 is improved, so that the particle detection unit 200 suppresses a decrease in measurement accuracy. ..

In this way, the barrier walls 213, 214, 215, and 216 are portions that suppress the inflow of air into the case 210 through a path that does not pass through the first opening 220 and improve the accuracy of measurement by the particle detection unit 200. It has become. Such barrier walls 213, 214, 215, and 216 (labyrinth structure) correspond to the "accuracy improving unit" in the present embodiment.

In the present embodiment, since the inflow guide portion 230 described above is provided, more air will flow into the inside of the case 210 through the first opening 220. That is, the provision of the inflow guide portion 230 also improves the proportion of the air flowing into the inside of the case 210 through the first opening 220. Therefore, the inflow guide unit 230 also functions as one of the "accuracy improvement units" in the present embodiment.

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

In the present embodiment, the top wall 171 that partitions the upper side of the air introduction chamber 160 is formed so as to extend to a position facing the upper 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 from above by the top wall 171.

Further, a protruding wall 172 is provided on the upper surface 201 of the case 210. The protruding wall 172 is formed so as to project 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 protruding wall 172 formed in this way can be said to 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. The particle detection unit 200 targets particles having a particle diameter of approximately 2.5 μm or less, so-called “PM2.5”. Therefore, when the air flowing in from the first opening 220 contains particles having a larger particle diameter than the above (that is, particles not to be measured), the measurement accuracy of the particle concentration by the particle detection unit 200 is improved. It will decrease. Specifically, the particle concentration measured by the particle detection unit 200 becomes higher than the actual particle concentration.

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

Further, 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 the air contains particles having a large diameter, the particles cannot get over the protruding wall 172, so that it is difficult to reach the opening 161.

As described above, in the present embodiment, the inflow of particles larger than the particles to be measured into 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 large-diameter particles is suppressed. Such a top wall 171 and a protruding wall 172 correspond to the "accuracy improving unit" in the present embodiment.

Further, in the present embodiment, since the large-diameter particles are less likely to be deposited inside the case 210, the effect of reducing the frequency of maintenance (cleaning) of the particle detection unit 200 can be obtained. It should be noted that the detection target of PM2.5 as described above is only an example. The particle concentration measurement by the particle detection unit 200 may be performed with particles other than PM2.5 as detection targets.

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

In the present embodiment, the opening 161 of the air introduction chamber 160 is not formed so as to open toward the left side (that is, the case 210 side) in FIG. 5, but is not formed so as to open toward the left side (that is, the case 210 side) in FIG. It is formed so as to open toward (shown). Also in this embodiment, the large-diameter particles falling outside the air introduction chamber 160 are blocked by the top wall 171 so that it is difficult for them to directly flow into the first opening 220. Even in such an embodiment, the same effect as that described in the second embodiment is obtained.

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

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

The dotted line DL1 shown in FIG. 6 is a line drawn so as to extend vertically downward from the upper end of the surface 202. The entire inflow guide portion 230 is arranged in a range on the surface 202 side of the dotted line DL1.

As a result, the portion of the case 210 (surface 202) above the first opening 220 is in a state of covering the first opening 220 and the inflow guide portion 230 from above. Therefore, the large-diameter particles that fall outside the air introduction chamber 160 are blocked by the inclined surface 202 as described above, so that it is difficult for them to directly flow into the first opening 220. As a result, deterioration of measurement accuracy due to large-diameter particles is suppressed. As described above, the portion of the case 210 (surface 202) above the first opening 220 corresponds to the “accuracy improving portion” in the present embodiment.

A fifth embodiment will be described with reference to FIG. In the following, the points different from the second embodiment will be mainly described, and the points common to the second embodiment will be omitted as appropriate.

In the present embodiment, the opening 161 which is the inlet of air in the air introduction chamber 160 is formed at a position which is 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 facing 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 large-diameter particles is suppressed.

By the way, 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. Therefore, as shown by the 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.

Therefore, in the present embodiment, a guide wall 173 is provided inside the air introduction chamber 160 in order to prevent air from flowing through the above-mentioned route. The guide wall 173 is a wall formed so as to extend from the edge portion of the opening 161 on the side opposite to the case 210 (on the right side in FIG. 7) to a position higher than the first opening 220. By such a guide wall 173, the air flowing into the air introduction chamber 160 from the opening 161 is guided to a position higher than the first opening 220. As a result, the flow of air in the vicinity of the first opening 220 is ensured, so that a part of the air easily flows into the inside of the first opening 220. The guide wall 173 that guides air containing no large-diameter particles to the first opening 220 corresponds to the “accuracy improving unit” in the present embodiment. Even in such an embodiment, the same effect as that described in the second embodiment is obtained.

An accuracy improving unit (for example, an inflow guide unit 230 of the first embodiment) for suppressing the inflow of air into the case 210 through a path that does not pass through the first opening 220, and particles larger than the particles to be measured. Only one of the accuracy improving units (for example, the top wall 171 of the second embodiment) for suppressing the inflow of particles from the first opening 220 into the case 210 is provided in the vehicle air conditioner 10. It may be provided, or both may be provided.

The present embodiment has been described above with reference to specific examples. However, the present disclosure is not limited to these specific examples. Those skilled in the art with appropriate design changes to these specific examples are also included in the scope of the present disclosure as long as they have the features of the present disclosure. Each element included in each of the above-mentioned specific examples, its arrangement, conditions, shape, etc. is not limited to the illustrated one, and can be appropriately changed. The combinations of the elements included in each of the above-mentioned specific examples can be appropriately changed as long as there is no technical contradiction.

10: Vehicle air conditioner 100: Air conditioner unit 160: Air introduction chamber 171: Top wall 172: Protruding wall 173: Guide wall 200: Particle detector 202: Surface 210: Case 213, 214, 215, 216: Block wall 220: First opening 230: Inflow guide 240: Second opening

Claims (4)

A vehicle air conditioner (10)
An air-conditioning unit (100) that supplies air-conditioned air into the passenger compartment,
A particle detector (200) for measuring the concentration of particles in the air is provided.
An air introduction chamber (160), which is a space through which 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 (220) in which a first opening (220) into which air from the air introduction chamber flows in and a second opening (240) in which air is discharged into the air introduction chamber are formed. 210), and is configured to measure the concentration of the particles in the air flowing into the inside of the case from the first opening.
At least one of the fact that air flows into the case through a path that does not pass through the first opening and that particles larger than the particles to be measured flow into the inside of the case through the first opening. By suppressing it, it is further provided with an accuracy improving unit for improving the accuracy of measurement by the particle detecting unit .
The accuracy improving unit
It is configured to improve the proportion of the air flowing into the inside of the case through the first opening of the air flowing into the case.
The case has a double structure consisting of an inner wall (212) and an outer wall (211).
The accuracy improving unit
Vehicle air conditioner having a labyrinth structure (213,214,215,216) formed in the vicinity of the first opening so as to prevent air between the inner wall and the outer wall from flowing into the case. apparatus. A vehicle air conditioner (10)
An air-conditioning unit (100) that supplies air-conditioned air into the passenger compartment,
A particle detector (200) for measuring the concentration of particles in the air is provided.
An air introduction chamber (160), which is a space through which 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 (220) in which a first opening (220) into which air from the air introduction chamber flows in and a second opening (240) in which air is discharged into the air introduction chamber are formed. 210), and is configured to measure the concentration of the particles in the air flowing into the inside of the case from the first opening.
At least one of the fact that air flows into the case through a path that does not pass through the first opening and that particles larger than the particles to be measured flow into the inside of the case through the first opening. It is further provided with an accuracy improving unit that improves the accuracy of measurement by the particle detecting unit by suppressing the particle detection unit.
The accuracy improving unit
It is configured to prevent particles larger than the particles to be measured from flowing into the case through the first opening.
The air introduction chamber is configured so that air flows downward from a position above the first opening.
The accuracy unit, car dual air conditioner that having a first opening disposed so as to cover from above the top wall (171). The accuracy improving portion further includes a protruding wall (172) provided so as to project upward in the middle of a flow path through which air flowing toward the first opening along the top wall flows. 2. The vehicle air conditioner according to 2 . A vehicle air conditioner (10)
An air-conditioning unit (100) that supplies air-conditioned air into the passenger compartment,
A particle detector (200) for measuring the concentration of particles in the air is provided.
An air introduction chamber (160), which is a space through which 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 (220) in which a first opening (220) into which air from the air introduction chamber flows in and a second opening (240) in which air is discharged into the air introduction chamber are formed. 210), and is configured to measure the concentration of the particles in the air flowing into the inside of the case from the first opening.
At least one of the fact that air flows into the case through a path that does not pass through the first opening and that particles larger than the particles to be measured flow into the inside of the case through the first opening. It is further provided with an accuracy improving unit that improves the accuracy of measurement by the particle detecting unit by suppressing the particle detection unit.
The accuracy improving unit
It is configured to prevent particles larger than the particles to be measured from flowing into the case through the first opening.
The air introduction chamber is configured so that air flows from a position below the first opening toward an upward side.
The accuracy unit, the inflow air in the air intake chamber, the car dual air conditioner that having a guide wall (173) provided to guide up to a position higher than the first opening.

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