JP5333280B2 - Alcohol detector - Google Patents

Description

  The present invention relates to an alcohol detection device for detecting the alcohol concentration in exhaled breath discharged from a user.

  This specification demonstrates the alcohol detection apparatus mounted in a vehicle (for example, motor vehicle). In recent years, drunk driving of vehicles has become a serious social problem, and it is strictly forbidden for a driver to drive a vehicle in a drunk state. For this reason, inventions of various vehicle alcohol detection devices have been filed.

  In the case of a conventional alcohol detection device, a good detection result is obtained when the driver blows weak exhalation, but when the user blows strong exhalation, the exhalation passes through the gap of the fan blades, The flow velocity when passing through the part where the sensor is arranged increases, and it becomes difficult to obtain a stable measurement result.

  A technique for solving the above-described problems is disclosed. In the technique disclosed in Patent Document 1, a pressure regulating valve is attached on the upstream side of the sensor, and when the momentum of exhalation is large, the flow rate is adjusted by the pressure regulating valve. In the technique disclosed in Patent Document 2, the flow rate of exhalation is measured by a flow rate sensor, and the timing for performing alcohol detection is determined. However, these techniques have a problem that the configuration is complicated because a pressure regulating valve and a flow velocity sensor are added.

  The technique disclosed in Patent Document 3 corrects the alcohol content contained in exhaled air by humidity, but this is limited to the case where there is no bias in the flow rate of exhaled air passing through the sensor.

JP 2006-98058 A JP 2008-309650 A JP-A-6-197897

  In view of the above-described problems, an object of the present invention is to provide an alcohol detection device capable of obtaining a good detection result even when a user blows in exhaled air.

The first invention for solving the above-described problems is as follows.
A case body provided with an exhalation entrance for introducing exhalation exhaled by the user;
A fan disposed on the downstream side of the exhalation inlet in the case body, and stirring the exhalation of the user flowing in through the exhalation inlet and sending it further downstream;
A sensor that is disposed on the downstream side of the fan in the case body and detects alcohol content in the breath of the user sent by the fan;
The fan is characterized in that the flow direction of exhaled air flowing into the exhalation inlet of the case body and the flow direction of exhaled air flowing into the fan are non-coaxial.

  The alcohol detection device according to the first invention is configured as described above, and the exhalation of the user blown into the case body flows out downstream by the fan. This fan is arranged so that the flow direction of exhaled air flowing into the case body (that is, blown into the case body) and the flow direction of exhaled air flowing into the fan are non-coaxial. This means that exhaled air blown into the case body easily collides with the fan blades. This makes it difficult for exhaled air that has been blown into the case body to pass through the gap between the fan blades, and the exhaled air that has been blown into the case body is agitated by the fan and flows downstream at a constant flow rate. . As a result, the flow rate of exhaled air passing through the portion where the sensor is disposed becomes substantially constant, and the detection result of the sensor becomes good. Note that “non-coaxial” in this specification includes not only the case where the axes are not coaxial, but also the case where the axes intersect.

The second invention for solving the above-described problems is as follows.
A case body provided with an exhalation entrance for introducing exhalation exhaled by the user;
A fan disposed on the downstream side of the exhalation inlet in the case body, and stirring the exhalation of the user flowing in through the exhalation inlet and sending it further downstream;
A sensor that is disposed on the downstream side of the fan in the case body and detects alcohol content in the breath of the user sent by the fan;
The sensor is arranged such that the flow direction of exhaled gas flowing out of the fan and the flow direction of exhaled air passing through the sensor are non-coaxial ,
The fan is a centrifugal fan that includes a rotating shaft portion and a plurality of blade portions protruding in a radial direction from an outer peripheral surface of the rotating shaft portion, and flows exhaled air in a direction perpendicular to the axis of the rotating shaft portion. It is a feature.

  The alcohol detection device according to the second invention is configured as described above, and the sensor includes a flow direction of the exhaled air that has flowed out downstream by the fan, and a flow direction of the exhaled air that passes through a portion where the sensor is disposed. Are arranged so as to be non-coaxial. This is realized, for example, by providing a flow direction changing member for changing the flow direction of the exhaled air flowing out from the fan between the fan and the sensor. As a result, the flow rate of exhaled air is reduced, and the flow rate becomes almost constant and passes through the portion where the sensor is disposed. As a result, the flow rate of exhaled air passing through the sensor becomes substantially constant, and the detection result of the sensor becomes good.

  The fan may be an axial fan that includes a rotating shaft portion and a plurality of blade portions that protrude in a radial direction from an outer peripheral surface thereof, and that exhales air in the axial direction of the rotating shaft portion.

  In addition, the fan may be a centrifugal fan that includes a rotating shaft portion and a plurality of blade portions that protrude in the radial direction from an outer peripheral surface thereof, and that exhales air in a direction perpendicular to the axis of the rotating shaft portion.

  In particular, in the case of an axial fan, it is desirable that the plurality of blade portions be provided such that no gap is generated when they are projected onto a plane orthogonal to the axial direction of the rotating shaft. For this purpose, for example, a plurality of blade portions are overlapped with each other in the axial direction so that no gap is generated. Thereby, since the exhaled air blown into the fan always collides with the wing part, it is difficult for the problem that the exhaled gas passes through the gap between the wing parts.

It is the schematic of the driver's seat where the alcohol detection apparatus 101 of 1st Example was mounted. 1 is an overall perspective view of an alcohol detection device 101 according to a first embodiment. It is an exploded perspective view similarly. It is a sectional view of the upper part similarly. (A) is a front view of the axial flow fan 7, (b) is a side sectional view. 2 is a perspective view of an alcohol detection sensor 12. FIG. It is sectional drawing of the upper part of the alcohol detection apparatus 102 of 2nd Example. It is sectional drawing of the upper part of the alcohol detection apparatus 103 of 3rd Example. (A) is a front view of the axial fan 7 ', and (b) is a side sectional view. It is a disassembled perspective view of the alcohol detection apparatus 104 of 4th Example. It is sectional drawing of the upper part of the alcohol detection apparatus 104 of 4th Example. (A) is a front view of the centrifugal fan 38, and (b) is a side sectional view of the same. It is sectional drawing of the upper part of the alcohol detection apparatus 105 of 5th Example.

  Hereinafter, embodiments of the present invention will be described in detail. In this specification, an alcohol detection device mounted on a vehicle will be described.

  FIG. 1 is a schematic diagram of a driver's seat on which the alcohol detection device 101 of the first embodiment is mounted, FIG. 2 is an overall perspective view of the alcohol detection device 101 of the first embodiment, FIG. 3 is an exploded perspective view, and FIG. FIG. 5A is a front view of the axial flow fan 7, FIG. 5B is a side sectional view of the same, and FIG. 6 is a perspective view of the alcohol detection sensor 12.

  As shown in FIG. 1, the alcohol detection device 101 of the first embodiment is attached to the driver's seat of a vehicle (automobile). For example, the alcohol detection device 101 is detachably connected to the instrument panel 1 of the driver's seat with a cable 2. When the driver M (user) seated in the driver's seat tries to start the engine of the vehicle, the driver M blows the breath on the alcohol detection device 101. If the alcohol concentration in the exhalation is equal to or lower than a predetermined value, the alcohol detection device 101 determines that the driver M is not in a drunk state and permits the engine to start. If the alcohol concentration in the exhalation exceeds a predetermined value, the alcohol detection device 101 determines that the driver M is in a drunk state and does not allow the engine to start. This prevents drunk driving.

As shown in FIGS. 2 to 4, the alcohol detection device 101 of the first embodiment is a composite gas sensor in which a plurality of types of sensors (described later) are mounted on a case body 5 having a front panel 3 and a rear panel 4. As a form. The case body 5 includes an exhalation flow path forming member 6, and an axial flow fan 7 and a sensor substrate 8 are attached to the exhalation flow path forming member 6. As shown in FIG. 5, the axial fan 7 is attached to a fan case 9, and includes a rotating shaft portion 10 that houses a motor (for example, a brushless DC motor), and a plurality of blades that protrude radially from the outer peripheral surface thereof. The exhaled air that is stirred by the blade portion 11 that rotates at a high speed flows out along the axial direction of the axis 10 a of the rotating shaft portion 10. The axial fan 7 of this embodiment operates at, for example, 5 V, and has a rotational speed of about 4000 min ⁻¹ (rpm). Each sensor for detecting the alcohol content in exhaled breath is mounted on the sensor substrate 8. In this specification, only the alcohol detection sensor 12 and the oxygen sensor 13 are illustrated as sensors, but a temperature sensor and a humidity sensor (both not shown) may be mounted in addition to these.

  The case body 5 formed integrally with the front panel 3 and the rear panel 4 has a size that can be easily gripped by the driver M (see FIG. 1). 3a and 4a are continuously thinned. An intake hole 14 (exhalation inlet) for passing exhaled air blown by the driver M is provided at the upper front portion of the front panel 3. The exhalation hole 14 of the alcohol detection device 101 according to the first embodiment has a rectangular shape, and a horizontal rail 15 is attached to prevent intrusion of garbage. Below the intake hole 14 in the front panel 3, a display window 17 for fitting a liquid crystal display unit (LCD panel 16 to be described later) and a push button window 19 for fitting a push button 18 are provided. Is provided. A fulcrum shaft 18 a is provided at the upper part of the push button 18, and this fulcrum shaft 18 a is rotatably attached to the back surface portion of the front panel 3. In this state, the front portion of the push button 18 protrudes slightly forward from the push button window 19 of the front panel 3.

  Below the exhalation flow path forming member 6, a control ECU 22 to which an LCD panel 16 and a switch 21 are attached is disposed. The control ECU 22 controls the rotational speed of the rotary shaft portion 10 of the axial fan 7 to be always constant by means (not shown) (for example, PWM control), or displays the result of the expiration measurement on the LCD panel 16. It has a function to do. When the control ECU 22 is attached to the rear portion of the front panel 3, the LCD panel 16 is fitted into the display window 17 of the front panel 3. As a result, the driver M can visually recognize characters and symbols displayed on the LCD panel 16. In addition, the switch 21 is disposed close to the back surface of the push button 18. When the driver M pushes the push button 18, the push button 18 rotates around the fulcrum shaft 18a and pushes the switch 21. Thereby, the alcohol detection apparatus 101 operates. An exhaust hole 23 for exhausting exhaled air is provided on the back surface of the rear panel 4. In FIG. 3, reference numeral 24 denotes a connector for connecting the control ECU 22 and the cable 2.

  As shown in FIG. 6, the alcohol detection sensor 12 is a semiconductor-type gas sensor, and the electric conductivity (electric resistance) due to the adsorption of gas (alcohol in breath) to the surface of a metal oxide (for example, tin oxide) semiconductor. ) Is measured. A gas sensitive element 26 (metal oxide semiconductor) is provided on the upper surface of the base member 25, and the periphery thereof is covered with a metal cap 27. A window portion 27a is provided on the upper surface of the cap 27, and the window portion 27a is covered with a mesh 28 having a double wire mesh structure. The mesh 28 reduces the influence of the detected exhalation flow rate.

  The oxygen sensor 13 detects the oxygen concentration of exhaled breath that is diluted by being mixed with the outside air. For example, a zirconia solid electrolyte may be used. Here, the oxygen concentration in the outside air in the passenger compartment is almost constant even when the weather and the number of passengers change. However, the oxygen concentration of exhaled air (in other words, the dilution rate of exhaled air) is lower than the oxygen concentration of outside air even when diluted with outside air. That is, by monitoring the change in the oxygen concentration detected by the oxygen sensor 13, it is possible to determine whether or not exhaled air is contained in the air in the exhalation flow path forming member 6.

  The exhalation flow path forming member 6 in the alcohol detection device 101 of the first embodiment will be described in detail. As shown in FIGS. 3 and 4, the exhalation flow path forming member 6 has a rectangular tube shape bent in an L shape, and an opening is formed at each of an upstream end and a downstream end, An exhalation flow path 29 is formed at the end. The axial fan 7 is attached horizontally to the opening on the upstream side (that is, the axis 10a is vertical). Of the lower surface portion of the exhalation flow path forming member 6, the lower surface portion 31 a on the upstream side is an inclined surface that is gently inclined with respect to the horizontal direction, so that the flow direction of the exhaled air discharged from the axial fan 7 can be smooth. Switching. In addition, in the lower surface portion 31b on the downstream side, holes 32 for projecting the alcohol detection sensor 12 and the oxygen sensor 13 are provided.

  Of the upper surface portion of the exhalation flow path forming member 6, the portion that contacts the back surface side of the axial flow fan 7 is a partition 33 that projects upward beyond the upper surface portion of the axial flow fan 7. The partition 33 has a function of applying the exhaled air blown into the intake hole 14 so that the entire air is sucked into the axial fan 7.

  A sensor substrate 8 is disposed below the exhalation flow path forming member 6. At this time, the alcohol detection sensor 12 and the oxygen sensor 13 mounted on the sensor substrate 8 project from the respective holes 32 provided in the lower surface 31b on the downstream side of the exhalation flow path forming member 6. Thereby, the alcohol detection sensor 12 and the oxygen sensor 13 are arranged in series in this order in the expiration flow path 29 of the expiration flow path forming member 6.

  When the exhalation flow path forming member 6 is attached to the case body 5, the upper surface of the axial fan 7 is disposed so as to be substantially flush with the lower end surface of the intake hole 14 of the front panel 3. For this reason, a space Q is formed in a portion above the axial flow fan 7. The space Q is blocked by the partition 33 of the exhalation flow path forming member 6, both side walls of the front panel 3, and the horizontal plate 34 protruding from the back of the front panel 3, and blown into the intake hole 14. The exhaled breath is efficiently sucked into the axial fan 7.

  The operation of the alcohol detection device 101 of the first embodiment will be described. When the driver M holds the case body 5 and presses the push button 18, the rotary shaft portion 10 of the axial fan 7 rotates and the sensors 12 and 13 are energized, and the alcohol detection device 101 enters an operation standby state. . In this state, the driver M blows his / her exhalation into the intake hole 14 of the front panel 3. If the driver M blows in the air weakly, the exhaled air that has passed through the space 15 between the horizontal holes 15 of the intake hole 14 and entered the space Q above the axial fan 7 is sucked into the axial fan 7 as it is. . In FIG. 4, the flow direction of the exhaled air blown into the inhalation hole 14 is indicated by an arrow P1, the flow direction of the exhaled air flowing into the axial fan 7 is indicated by an arrow P2, and the flow direction of the exhaled air flowing out from the axial fan 7 is indicated by an arrow. The flow direction of exhaled air which passes through the part (henceforth a sensor part) shown by P3 and arrange | positions the sensors 12 and 13 is shown by arrow P4. If the driver M blows in exhaled air, the exhaled air collides with the partition 33 of the exhalation flow path forming member 6, reduces the flow velocity, and is sucked into the axial flow fan 7. In the alcohol detection device 101 of the first embodiment, since the axis 10a of the rotary shaft portion 10 of the axial fan 7 is arranged vertically, the arrow P1 and the arrow P2 intersect in an orthogonal state.

  Exhaled air (arrow P 1) blown into the intake hole 14 by the driver M is sucked into the axial flow fan 7, stirred by the axial flow fan 7, and discharged to the exhalation flow path 29. Since the flow direction of the exhalation when the driver M blows into the inhalation hole 14 (arrow P1) and the direction of the exhalation flow sucked into the axial fan 7 (arrow P2) are orthogonal, the flow of exhalation is weakened. It is done. For this reason, even if the driver M blows in exhalation vigorously, the exhalation is unlikely to pass through the gap e (see FIG. 4) between the blade portions 11 of the axial fan 7. The exhaled air is sufficiently agitated by the axial fan 7.

  The exhaled air (arrow P3) flowing out from the axial fan 7 collides with the upstream lower surface portion 31a of the exhalation flow path forming member 6 and flows through the exhalation flow path 29 while changing its flow direction to a substantially right angle. Since the upstream lower surface portion 31a of the exhalation flow path forming member 6 is a gently inclined surface and the flow direction of exhalation can be changed smoothly, exhalation is less likely to be turbulent. As a result, regardless of the momentum (intensity) of exhalation when the driver M inhales exhalation, the flow rate of exhalation (arrow P4) passing through the sensor portion becomes substantially constant, and the accuracy of alcohol detection is improved. Exhaled air that has contacted the alcohol detection sensor 12 and the oxygen sensor 13 is discharged to the outside from the exhaust hole 23 of the rear panel 4.

  In the alcohol detection device 101 of the first embodiment described above, the axial fan 7 is arranged horizontally (that is, the axis 10a of the rotary shaft portion 10 is vertical). However, like the alcohol detection device 102 of the second embodiment shown in FIG. 7, the axial fan 7 is arranged so that the axis 10 a of the rotary shaft portion 10 of the axial fan 7 is inclined via the bracket 35. May be.

  In the alcohol detection devices 101 and 102 of the first and second embodiments, the flow direction of the exhaled air flowing into the inhalation hole 14 (arrow P1) and the flow direction of the exhaled air flowing into the axial fan 7 (arrow P2) are non-coaxial. In addition to being arranged in the (crossed state), the flow direction of the exhaled air flowing out from the axial fan 7 (arrow P3) and the flow direction of the exhaled air passing through the sensor portion (arrow P4) are also non-coaxial (crossed state). Has been placed.

  Next, the alcohol detection device 103 of the third embodiment will be described. In the alcohol detection device 103 of the third embodiment shown in FIG. 8, the axial fan 7 is arranged vertically (that is, the axis 10a of the rotating shaft portion 10 is horizontal). The exhalation flow path forming member 34 constituting the alcohol detection device 102 of the second embodiment has a rectangular tube shape bent in a substantially inverted S shape, and the exhalation flow direction is provided between the upstream side and the downstream side. A bending portion 36 for changing the angle is provided. Exhaled air (arrow P1) blown into the intake hole 14 is directly discharged to the downstream side by the axial fan 7 (arrows P2, P3). The exhaled air collides with the inner wall surface of the bent portion 36 of the exhalation flow path forming member 34 and changes its flow direction, while decreasing its flow velocity to contact the alcohol detection sensor 12 and the oxygen sensor 13 (arrow P4). Thereby, the effect similar to the alcohol detection apparatus 101 of 1st Example is show | played. Thereafter, exhaled air is discharged to the outside from the exhaust hole 23 of the rear panel 4. In the case of the alcohol detection device 103 of this embodiment, since the thickness of the arrangement portion of the axial fan 7 in the case body 5 is reduced, there is an advantage that the thickness of the entire case body 5 can be reduced.

  The axial flow fan 7 constituting the alcohol detection devices 101 to 103 of the first to third embodiments described above has a function of flowing out the exhaled breath downstream and a function of stirring the exhaled breath. ing. In particular, in the case of the alcohol detection device 103 of the third embodiment, if a gap e (see FIG. 5) is provided between the blade portions 11 of the axial flow fan 7, the exhaled air that is blown in strongly is between the blade portions 11. It may slip through the gap e and may not be sufficiently stirred. In order to prevent this, like the axial fan 7 ′ shown in FIG. 9, it is desirable to form the overlapping portion 37 by overlapping the end portions of the blade portions 11 in the circumferential direction in the axial direction. As a result, the exhaled air that has been blown in always collides with the blade portion 11 of the axial flow fan 7 ′, so that it is prevented from passing between the blade portions 11.

  In the alcohol detection device 103 according to the third embodiment, the flow direction of the exhaled air flowing into the intake hole 14 (arrow P1) and the flow direction of the exhaled air flowing into the axial fan 7 (arrow P2) are arranged coaxially. The flow direction of the exhaled air flowing out from the axial fan 7 (arrow P3) and the flow direction of the exhaled air passing through the sensor portion (arrow P4) are non-coaxial (crossed).

  Next, the alcohol detection device 104 of the fourth embodiment will be described. The alcohol detectors 101 to 103 of the first to third embodiments use the axial fan 7, whereas the alcohol detector 104 of the fourth embodiment shown in FIGS. 10 and 11 is a centrifugal fan. 38 is used. Hereinafter, the difference between the alcohol detection device 104 of the fourth embodiment and the alcohol detection device 101 of the first embodiment will be described.

  As shown in FIG. 12, the centrifugal fan 38 includes a rotating shaft portion 41 that is rotatable with respect to the fan case 39 by a motor (for example, a brushless DC motor) built in the fan case 39, and an outer periphery of the rotating shaft portion 41. And a plurality of blade portions 42 protruding substantially tangentially from the surface. The surface (upper surface) on one side of the fan case 39 is opened to allow exhalation to flow in, but the surface (lower surface) on the other side is closed. An outflow hole 43 for flowing exhaled air downstream is provided in one of the side surfaces of the fan case 39 along a direction orthogonal to the axis 41a of the rotating shaft 41 and is stirred by the blade 42. The exhaled breath is discharged from the outflow hole 43 to the downstream side.

  As shown in FIG. 11, the exhalation flow path forming member 44 constituting the alcohol detection device 104 of the fourth embodiment has a rectangular tube shape bent substantially at a right angle, and the exhalation air flow of the alcohol detection device 101 of the first embodiment. Like the path forming member 6, a partition portion 45 is provided. The centrifugal fan 38 is attached horizontally to the opening of the entrance portion of the exhalation flow path forming member 44 (that is, the axis 41a of the rotary shaft portion 41 is vertical). The exhaled air (arrow P1) blown into the intake hole 14 collides with the partition 45 of the exhalation flow path forming member 44 and flows into the centrifugal fan 38 (arrow P2). Exhaled air (arrow P3) flowing out from the centrifugal fan 38 contacts the alcohol detection sensor 12 and the oxygen sensor 13 (arrow P4), and is discharged to the outside from the exhaust hole 23 of the rear panel 4.

  In the case of the alcohol detection device 104 according to the fourth embodiment, the flow rate of the exhaled air flowing out from the centrifugal fan 38 is substantially constant regardless of whether the exhalation force blown into the intake hole 14 is weak or strong. . That is, the flow rate of the exhaled air (arrow P4) passing through the sensor portion becomes substantially constant regardless of the strength of the exhaled air (arrow P1) blown into the inhalation hole 14, and the alcohol detection accuracy is improved.

  In the alcohol detection device 104 of the fourth embodiment, the flow direction of the exhaled air flowing into the inhalation hole 14 (arrow P1) and the flow direction of the exhaled air flowing into the axial fan 7 (arrow P2) are non-coaxial (crossed). The flow direction of the exhaled air flowing out from the centrifugal fan 38 (arrow P3) and the flow direction of the exhaled air passing through the sensor portion (arrow P4) are arranged coaxially.

  As in the alcohol detection device 105 of the fifth embodiment shown in FIG. 13, the centrifugal fan 38 may be arranged so that the axis 39a of the rotation shaft portion 39 is horizontal or oblique. In the case of the alcohol detection device 105 of this embodiment, since the thickness of the portion where the centrifugal fan 38 is disposed in the case body 5 is reduced, there is an advantage that the thickness of the entire case body 5 can be reduced.

  In the alcohol detection device 105 of the fifth embodiment, the flow direction of the exhaled air flowing into the intake hole 14 (arrow P1) and the flow direction of the exhaled air flowing into the axial flow fan 7 (arrow P2) are non-coaxial (crossed). In addition to the arrangement, the flow direction of the exhaled air flowing out from the centrifugal fan 38 (arrow P3) and the flow direction of the exhaled air passing through the sensor portion (arrow P4) are also arranged non-coaxial (crossed state).

  The present invention can be used for an alcohol detection device of a vehicle (for example, an automobile).

101-105 Alcohol detection device 5 Case body 7, 7 'Axial fan (fan)
10, 41 Rotating shaft 10a, 41a Axis (axial direction)
11, 42 Blade 12 Alcohol detection sensor (sensor)
13 Temperature sensor (sensor)
14 Inhalation hole (exhalation inlet)
29 Exhalation flow path 36 Bending part (flow direction changing member)
37 Overlap part 38 Centrifugal fan (fan)
e Gap M Driver (user)
P1 to P4 arrows (exhalation flow direction)

Claims (8)

A case body provided with an exhalation entrance for introducing exhalation exhaled by the user;
A fan disposed on the downstream side of the exhalation inlet in the case body, and stirring the exhalation of the user flowing in through the exhalation inlet and sending it further downstream;
A sensor that is disposed on the downstream side of the fan in the case body and detects alcohol content in the breath of the user sent by the fan;
The alcohol detection device, wherein the fan is arranged so that a flow direction of exhaled air flowing into the exhalation inlet of the case body and a flow direction of exhaled air flowing into the fan are non-coaxial. Before SL sensors, alcohol detection device according to claim 1, characterized in that the flow direction of the exhaled air passing through the sensor leaked to the flow direction of the exhalation from the fan is disposed so as to be non-coaxial .   A flow direction changing member is provided between the fan and the sensor to make the flow direction of exhaled gas flowing out of the fan non-coaxial with the flow direction of exhaled gas passing through the sensor. The alcohol detection device according to claim 2.   The fan is an axial fan that includes a rotating shaft portion and a plurality of blade portions that protrude in a radial direction from an outer peripheral surface of the rotating shaft portion, and flows exhaled air in the axial direction of the rotating shaft portion. The alcohol detection device according to any one of claims 1 to 3, wherein   The alcohol detection device according to claim 4, wherein the plurality of blade portions are provided so that no gap is generated when they are projected onto a surface orthogonal to the axial direction of the rotation shaft. .   6. The alcohol detection apparatus according to claim 5, wherein the plurality of blade portions are provided so that the gaps are not generated by overlapping end portions in the circumferential direction in the axial direction. .   The fan is a centrifugal fan that includes a rotating shaft portion and a plurality of blade portions protruding in a radial direction from an outer peripheral surface of the rotating shaft portion, and flows exhaled air in a direction perpendicular to the axis of the rotating shaft portion. The alcohol detection device according to any one of claims 1 to 3, wherein A case body provided with an exhalation entrance for introducing exhalation exhaled by the user;
  A fan disposed on the downstream side of the exhalation inlet in the case body, and stirring the exhalation of the user flowing in through the exhalation inlet and sending it further downstream;
  A sensor that is disposed on the downstream side of the fan in the case body and detects alcohol content in the breath of the user sent by the fan;
  The sensor is arranged such that the flow direction of exhaled gas flowing out of the fan and the flow direction of exhaled air passing through the sensor are non-coaxial,
  The fan is a centrifugal fan that includes a rotating shaft portion and a plurality of blade portions protruding in a radial direction from an outer peripheral surface of the rotating shaft portion, and flows exhaled air in a direction perpendicular to the axis of the rotating shaft portion. A characteristic alcohol detection device.

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