JP2008082691A - Flow passage switching device and ventilator equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flow passage switching device and a ventilator equipped with the flow passage switching device attaining simplification of constitution, reduction of manufacturing cost and accurate flow passage switching operation. <P>SOLUTION: The flow passage switching device comprises a flow passage switching plate provided at a branch point of a flow passage, and a driving device for operating the flow passage switching plate. The driving device comprises a motor rotating in one direction; a rotating member connected to a rotating shaft of the motor; a connecting member with one end connected to the flow passage switching plate and with the other end rotatably connected into a position spaced from the rotational center of the rotating member; and a sensing device for sensing the rotating position of the rotating member. The sensing device comprises a plurality of sensing protrusions provided at the rotating member, and a sensor for sensing the plurality of sensing protrusions, wherein at least one space between the plurality of sensing protrusions differs from spaces between the other sensing protrusions. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a flow path switching device and a ventilator equipped with the same, and more specifically, a flow path switching device capable of simplifying the configuration and realizing an accurate flow path switching operation. It is related with the ventilator provided with.

  Generally, the flow path switching device is a device that changes the air blowing path with an air conditioning facility or a ventilator. Korean Patent Laid-Open Publication No. 2005-98398 discloses a ventilator employing such a flow path switching device.

  The ventilator disclosed in the above publication has a total heat exchanger for exchanging heat between the air discharged from the room to the outside and the air flowing from the room to the room, and the air discharged from the room to the outside. A flow path switching device (represented as “damper” in the original text) that can change the flow path so as to pass through the total heat exchanger or bypass the total heat exchanger is provided. That is, in this apparatus, the flow path switching device functions to change the discharge flow path.

  Although the above publication does not specifically mention the configuration of the flow path switching device, the flow path switching device employed in such a device is usually provided rotatably at a branch point of the flow path. And a driving device that pushes the channel switching plate in any one direction, and a restoring spring that restores the initial position of the channel switching plate when the operation of the driving device is canceled. However, in such a channel switching device, when the restoring force of the restoring spring is weakened due to long-term use, the channel switching plate may not return to the initial position and malfunction may occur. Further, such a flow path switching device has a complicated configuration due to the use of a restoring spring.

  As another form of the flow path switching device, an example is known in which a step motor capable of rotating the flow path switching plate in the forward or reverse direction is employed. However, since such a channel switching device employs an expensive step motor, the manufacturing cost of the channel switching device is high.

  Further, not only a plurality of sensors are used for sensing the rotational position of the step motor, but also a D / C converter for applying a DC power source to the step motor is required, so that the configuration is complicated.

Korean Published Patent Publication No. 2005-98398

  The present invention is for solving such problems, and the object of the present invention is to simplify the configuration compared to the prior art, to reduce the manufacturing cost, and to perform an accurate flow path switching operation. It is an object of the present invention to provide a flow path switching device and a ventilation device including the same.

  In order to achieve such an object, a flow path switching apparatus according to the present invention includes a flow path switching plate provided at a branch point of a flow path and a drive device that operates the flow path switching plate. The driving device includes a motor rotating in one direction, a rotating member coupled to a rotating shaft of the motor, one end connected to the flow path switching plate, and the other end rotating center of the rotating member. A connecting member rotatably connected to a position separated from the rotating member, and a sensing device that senses a rotational position of the rotating member, wherein the sensing device includes a plurality of sensing protrusions provided on the rotating member, and the plurality of sensing protrusions. And at least one interval between the plurality of sensing projections is different from the spacing between the other sensing projections.

  The plurality of sensing protrusions include a first protrusion provided on the outer peripheral portion of the rotating member, a second protrusion provided on the outer peripheral portion of the rotating member on the opposite side of the first protrusion, and the first protrusion. And a third protrusion provided on the outer periphery of the rotating member between the protrusion and the second protrusion.

  The distance between the first protrusion and the third protrusion is the same as the distance between the second protrusion and the third protrusion, and the distance between the first protrusion and the second protrusion. Is different from the distance between the first protrusion and the third protrusion.

  Further, the second protrusion is provided at a position 180 degrees in the rotation direction from the first protrusion, and the third protrusion is provided at a position 90 degrees in the rotation direction from the first protrusion. To do.

  The driving device may further include a control unit configured to determine the position of the flow path switching plate by determining the sensing time difference of the sensing protrusion by rotating the rotating member.

  In addition, the ventilator according to the present invention includes a first flow path and a second flow path having different air flow paths, and air is blown through any one of the first flow path and the second flow path. The flow path switching device includes a flow path switching plate provided at a branch point between the first flow path and the second flow path, and the flow path switching apparatus. A driving device that operates a path switching plate, the driving device including a motor that rotates in one direction, a rotating member that is coupled to a rotating shaft of the motor, one end connected to the flow path switching plate, and the like. A connecting member rotatably connected to a position separated from a rotation center of the rotating member; and a sensing device that senses the rotational position of the rotating member, wherein the sensing device is provided on the rotating member. A plurality of sensing protrusions, and a sensor for sensing the plurality of sensing protrusions. At least one spacing between the sensing projection, characterized in that became different from the spacing between the other sensing projection.

  The ventilator according to the present invention includes a main body case having a discharge flow path for discharging indoor air and an inflow flow path for inflow of outdoor air, air discharged from the room to the outside, and from the outdoor A heat exchanger provided in the main body case for heat exchange of air flowing into the room, wherein the discharge flow path is a heat exchange discharge flow path that passes through the heat exchanger, and a detour that bypasses the heat exchanger A ventilator including a heat exchanger discharge channel and a channel switching device that selectively opens and closes the bypass discharge channel, wherein the channel switching device includes the heat exchange exhaust flow A flow path switching plate provided at a branch point of the path and the bypass discharge flow path, and a driving device that operates the flow path switching plate, the driving device comprising: a motor that rotates in one direction; and A rotating member coupled to the rotating shaft and one end of the rotating channel And a connecting member that is rotatably connected to a position separated from the rotation center of the rotating member, and a sensing device that senses the rotational position of the rotating member, the sensing device comprising the rotating member A plurality of sensing protrusions and a sensor for sensing the plurality of sensing protrusions, wherein at least one distance between the plurality of sensing protrusions is different from a distance between other sensing protrusions. It is characterized by that.

  As described above, the flow path switching device according to the present invention has a structure in which the position can be changed by pushing or pulling the flow path switching plate by the rotation operation of the motor. Compared to the above, there is an effect that the configuration can be simplified. In particular, the present invention can determine the position of the flow path switching plate through one sensing sensor, and thus has an effect that the configuration can be simplified as compared with the prior art.

  In addition, since the flow path switching device of the present invention can change the position of the flow path switching plate only by the operation of the motor rotating in one direction, it is possible to employ an inexpensive AC motor, thereby reducing the manufacturing cost. There is an effect that can be done.

  Further, in the flow path switching device of the present invention, the sensing sensor senses a plurality of sensing protrusions provided on the outer peripheral portion of the rotating member, and the time for each section (T1, T2, T3) required to detect each protrusion. Since the control unit can calculate the accurate initial position of the flow path switching plate, the flow path switching operation can be implemented accurately.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIGS. 1 and 2, the ventilation device according to the present invention includes a box-shaped main body case 10 and includes a heat exchanger 30 provided inside the main body case 10.

  The main body case 10 includes a first side surface portion 11 on the outdoor side, a second side surface portion 12 on the indoor side, and third and fourth side surface portions 13 and 14 that connect both ends of the first side surface portion 11 and the second side surface portion 12, respectively. Although it is not specifically shown in drawing, it has the upper surface part and lower surface part which cover an upper part and a lower part. An outside air flow inlet 15 and an inside air discharge port 16 are formed on the first side surface portion 11 on the outdoor side, and an inside air flow inlet 17 and an outside air discharge port 18 are formed on the second side surface portion 12. The first and second side surfaces 11 and 12 are provided with connecting pipes 19a, 19b, 19c and 19d having a predetermined length for connecting ducts (not shown).

  As shown in FIG. 1, the heat exchanger 30 is a total heat exchanger including a first flow path 31 through which air exhausted from the room to the outside passes and a second flow path 32 through which air flowing from the outside into the room passes. It is. The 1st flow path 31 and the 2nd flow path 32 are the directions which mutually cross, and are mutually divided. In such a heat exchanger 30, heat exchange is performed between the air that flows into the room from the outside through the first flow path 31 and the air that is discharged from the room to the outside through the second flow path 32.

  An exhaust air blowing unit 40 for exhausting indoor air is provided on the inside air outlet 16 side inside the main body case 10, and an air supply and air blowing unit for inflow of outdoor air is provided on the outside air outlet 18 side of the main body case 10. 50 is provided. The exhaust blower unit 40 includes an exhaust fan duct 41 connected to the inside air discharge port 16, an exhaust blower fan 42 provided in the exhaust fan duct 41, and an exhaust motor 43 that drives the exhaust blower fan 42. The air supply / air blowing unit 50 includes an air supply fan duct 51 connected to the outside air discharge port 18, an air supply / air supply fan 52 provided in the air supply fan duct 51, and an air supply motor 53 that drives the air supply / air supply fan 52. Including.

  Therefore, in the ventilator of the present invention, when the exhaust air blowing unit 40 operates, the room air that has flowed into the internal airflow inlet 17 passes through the first flow path 31 of the heat exchanger 30 and flows to the exhaust air blowing unit 40 side. It can be discharged to the inside air discharge port 16 through the blower unit 40. When the air supply / air blowing unit 50 operates, the outdoor air flowing into the external air flow inlet 15 passes through the second flow path 32 of the heat exchanger 30 and flows into the air supply / air blowing unit 50, and passes through the air supply / air blowing unit 50. The air is discharged to the outside air outlet 18. When such a ventilation operation is performed, heat exchange is performed while indoor air and outdoor air pass through the interior of the heat exchanger 30 so as to cross each other, so that heat loss in the room can be minimized.

  Further, as shown in FIG. 2, the ventilator of the present invention includes a bypass discharge channel 20 provided inside the third side surface portion 13 and a channel switching device 60 provided on the inner airflow inlet 17 side. The bypass discharge flow path 20 allows the room air flowing in via the internal air flow inlet 17 to immediately flow to the exhaust air blowing unit 40 side without passing through the heat exchanger 30. As shown in FIG. 2, the flow path switching device 60 discharges the room air that has flowed into the internal airflow inlet 17 to the outside through a flow path that passes through the heat exchanger 30 (hereinafter referred to as “heat exchange discharge flow path”). In addition, as shown in FIG. 3, it has a function of switching the flow path so that it can be discharged to the outside via the bypass discharge flow path 20.

Such a configuration performs a heat exchange ventilation operation (ventilation operation in which exhaust air passes through the heat exchanger) as shown in FIG. 2, or a general ventilation operation (exhaust air in the heat exchanger as shown in FIG. 3). This is so that a ventilation operation that does not pass through can be performed. Usually, heat exchange ventilation is performed when the temperature deviation between the room and the room is large, such as in summer and winter, and heat recovery is required. This is performed when it is not large, but this can be selected by the user by operating the flow path switching device 60 as required.

  As shown in FIGS. 4 and 5, the flow path switching device 60 operates a flow path switching plate 61 and a flow path switching plate 61 provided at a branch point of the heat exchange discharge flow path 30 and the bypass discharge flow path 20. A drive unit. One end of the flow path switching plate 61 is rotatably coupled to the main body case 10 so that the flow path can be switched by rotation.

  The driving device includes a flow path switching motor 62, a disk-shaped rotating member 63 coupled to the rotation shaft of the flow path switching motor 62, a connecting member 64 that connects the rotating member 63 and the flow path switching plate 63, and rotation. And a sensing device for sensing the rotational position of the member 64. The flow path switching motor 62 is configured by a normal AC motor that rotates in one direction, and is fixed to the bottom surface of the main body case 10 by a support bracket 65. One end of the connecting member 64 is rotatably coupled to the flow path switching plate 61, and the other end is rotatably coupled to the upper surface of the rotating member 63.

  The connection part 64 and the connection part 64 a of the flow path switching plate 61 are separated from the rotation center of the flow path switching plate 61, and the connection part 64 b of the connection member 64 and the rotation member 63 is also separated from the rotation center of the rotation member 63.

  As shown in FIG. 4, such a flow path switching device 60 is configured such that when the rotation member 63 rotates in one direction (clockwise) by the operation of the flow path switching motor 62, the connecting member 64 moves the flow path switching plate 61. You can push or pull. Therefore, the flow path switching plate 61 operates to close the bypass discharge flow path 20 and open the heat exchange discharge flow path as shown in FIG. 2, or to bypass the bypass discharge flow path as shown in FIG. The channel 20 can be opened and operated to close the heat exchange discharge channel.

  As shown in FIG. 4, the sensing device for sensing the rotational position of the rotating member 63 senses a plurality of sensing protrusions 66, 67, 68 provided on the outer periphery of the rotating member 63 and the sensing protrusions 66, 67, 68. As shown, a detection sensor 69 fixed to the support bracket 65 outside the rotation member 63 is included. The sensing sensor 69 includes a limit switch that is turned on / off depending on whether or not the sensing protrusions 66, 67, and 68 are in contact. The sensing protrusion includes a first protrusion 66, a second protrusion 67 provided at a position 180 degrees from the first protrusion 66 in the rotation direction of the rotation member 63, and a rotation angle of 90 degrees from the first protrusion 66 to the rotation member 63. 3rd protrusion 68 provided in a position. This is such that at least one spacing between the sensing protrusions is different from the spacing between the other sensing protrusions.

  When the detection sensor 69 is provided, the first projection 66 can be detected when the flow path switching plate 61 closes the inlet of the bypass discharge flow path 20 and opens the heat exchange discharge flow path. When the switching plate 61 opens the bypass discharge channel 20 and closes the heat exchange discharge channel, the second projection 67 is fixed at a position where it can be sensed. This is because when the first protrusion 66 is in contact with the detection sensor 69, it is detected that the flow path switching plate 61 is in a state of opening the heat exchange discharge flow path, and when the second protrusion 67 is in contact with the detection sensor, the flow path is changed. This is to detect that the switching plate 61 is in a state in which the bypass discharge channel 20 is opened. The third protrusion 68 is necessary for determining the initial position of the flow path switching plate 61 (or the rotating member 63). This will be described later.

  FIG. 6 is a control block diagram of the ventilation device according to the present invention. As illustrated, the ventilator according to the present invention includes a signal input unit 71, a control unit 70, and a display unit 72 for controlling the operation in the heat exchange ventilation mode or the general ventilation mode.

  The signal input unit 71 inputs operation information (heat exchange ventilation mode or general ventilation mode) selected by the user to the control unit 70. Then, the control unit 70 controls the operations of the flow path switching motor 62, the air supply motor 53, and the exhaust motor 43 so that the operation state is displayed via the display unit 72. The control unit 70 operates the flow path switching motor 62 of the flow path switching device 60 in the initial stage of operation so that the detection sensor 69 detects the first to third protrusions 66, 67, and 68. Based on this, the initial position of the flow path switching plate 61 (or the rotating member 63) is determined. A specific method for this will be described later.

  Further, the control unit 70 compares the initial position information of the flow path switching plate 61 with the operation information input via the signal input unit 71, and the initial position information of the flow path switching plate 61 matches the input operation information. If not, the flow path switching motor 62 is operated so as to match, and the position of the flow path switching plate 61 is initialized. The initial position determination and initialization method of the flow path switching plate 61 is as follows.

  In order to determine the initial position of the flow path switching plate 61, the control unit 70 operates the flow path switching motor 62 to rotate the rotating member 63 clockwise as shown in FIG. The first to third protrusions 66, 67, 68 on the outer peripheral portion of the rotating member 63 can be sensed. Such an operation is performed until the fourth protrusion is detected from the first protrusion detected by the detection sensor 69. If the sensing sensor 69 senses the first protrusion 66 first, it is performed until the first protrusion 66 is sensed again. In addition, the controller 70 takes time (T1) from the time when the first protrusion is detected to the time when the second protrusion is detected. The third protrusion is detected from the time when the second protrusion is detected. Time taken until time (T2) The time (T3) taken from the time when the third protrusion is sensed to the time when the first sensed protrusion is sensed is calculated. As in the example of FIG. 4, if the rotation member rotates clockwise with the detection sensor in contact with the first second protrusion, the detection sensor includes the second protrusion, the third protrusion, the first protrusion, Sensing is performed in the order of the second protrusions. Therefore, in this case, T1 and T2 are the same, and T3 is twice as large as T1 and T2.

  After calculating the time for each section (T1, T2, T3) by such a method, the control unit 70 compares the time for each section (T1, T2, T3) and compares the flow path switching plate 61 (or the rotation). The initial position of the member 63) is determined. That is, as shown in FIG. 7, when the detection result is a condition (A) of (T2> T1) & (T2> T3), it is determined that the initial position is a state where the detection sensor 69 and the third protrusion 68 are in contact with each other. To do.

  When the condition (B) of (T1> T2) & (T1> T3) is satisfied, it is determined that the initial position is a state in which the detection sensor 69 is in contact with the first protrusion 66. Therefore, at this time, it is determined that the flow path switching plate 61 can operate in the heat exchange ventilation mode by opening the heat exchange discharge flow path. In the case of the condition (C) of (T3> T1) & (T3> T2), it is determined that the initial position is a state in which the detection sensor 69 is in contact with the second protrusion 67. Therefore, at this time, it is determined that the flow path switching plate 61 can operate in the general ventilation mode with the bypass discharge flow path 20 opened. Thus, the flow path switching device 60 of the present invention employs one sensing sensor 69 and can easily determine the initial position.

  Next, operation | movement of the ventilator provided with such a flow-path switching apparatus is demonstrated.

  When the heat exchange ventilation mode is executed, the control unit 70 determines the initial position through sensing the initial position of the flow path switching plate 61, and determines whether or not it matches the input operation information (heat exchange ventilation mode). That is, it is determined whether or not the flow path switching plate 61 is in a state where the heat exchange discharge flow path is opened. At this time, if the position of the flow path switching plate 61 is in a state in which the heat exchange discharge flow path is opened, the supply air blowing unit 50 and the exhaust air blowing unit 40 are operated. If the position of the flow path switching plate 61 does not match the operation information, the initialization operation is performed to operate the flow path switching motor 62 so that the position of the flow path switching plate 61 matches the operation information. After the flow path switching plate opens the heat exchange discharge flow path, the air supply and exhaust air blowing units 50 and 40 are operated. If such an operation is performed, as shown in FIG. 2, all the air discharged from the room and the air flowing into the room pass through the heat exchanger 30. Therefore, a ventilation operation involving heat exchange can be performed.

  If the general ventilation mode is executed, the control unit 70 also determines the initial position through sensing the initial position of the flow path switching plate 61, and determines whether it matches the input operation information (general ventilation mode). And if the position of the flow-path switching board 61 is the state which open | released the bypass discharge flow path 20, the air supply ventilation unit 50 and the exhaust ventilation unit 40 will be operated. If the position of the flow path switching plate 61 does not match the operation information, the initialization operation is performed to operate the flow path switching motor 62 so that the position of the flow path switching plate 61 matches the operation information. After the flow path switching plate opens the bypass discharge flow path, the air supply and exhaust air blowing units 50 and 40 are operated. If such an operation is performed, as shown in FIG. 3, the air discharged from the room to the outside is discharged through the bypass discharge flow path 20, and the air flowing from the outside into the room passes through the heat exchanger 30. Flow into the room. Therefore, at this time, ventilation is performed without heat exchange.

1 is a perspective view of a ventilation device to which a flow path switching device according to the present invention is applied. It is sectional drawing of the ventilator to which the flow-path switching apparatus concerning this invention was applied, Comprising: It is a figure which shows a heat exchange ventilation state. It is sectional drawing of the ventilator to which the flow-path switching apparatus concerning this invention was applied, Comprising: It is a figure which shows a general ventilation state. It is a top view which shows the structure of the flow-path switching apparatus concerning this invention. It is a perspective view of the channel change device concerning the present invention, and is a figure showing the state applied to the ventilator. It is a control block diagram of the ventilation apparatus to which the flow path switching device according to the present invention is applied. It is a figure which shows the relationship between the detection conditions of the sensing apparatus of the flow-path switching apparatus concerning this invention, and an initial position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Main body case 15 Outside air flow inlet 16 Inside air discharge port 17 Outside air discharge port 18 Inside air flow inlet 20 Detour discharge flow path 30 Heat exchanger 40 Exhaust air blow unit 50 Supply air blow unit 60 Flow path switching device 61 Flow path switching plate 62 Flow path switching Motor 63 Rotating member 64 Connecting member 65 Support bracket 66 First projection 67 Second projection 68 Third projection 69 Sensor 70 Control unit

Claims (13)

A flow path switching device including a flow path switching plate provided at a branch point of the flow path and a driving device for operating the flow path switching plate,
The driving device includes a motor rotating in one direction, a rotating member coupled to a rotating shaft of the motor, one end connected to the flow path switching plate, and the other end separated from the rotation center of the rotating member. A connecting member rotatably connected to the sensor, and a sensing device for detecting a rotational position of the rotating member,
The sensing device includes a plurality of sensing protrusions provided on the rotating member and a sensor for sensing the plurality of sensing protrusions, and at least one interval between the plurality of sensing protrusions is between other sensing protrusions. A flow path switching device characterized by being different from the interval.   The plurality of sensing protrusions include a first protrusion provided on an outer peripheral portion of the rotating member, a second protrusion provided on an outer peripheral portion of the rotating member opposite to the first protrusion, and the first protrusion. The flow path switching device according to claim 1, further comprising a third protrusion provided on an outer peripheral portion of the rotating member between the second protrusion and the second protrusion. The distance between the first protrusion and the third protrusion is the same as the distance between the second protrusion and the third protrusion.
3. The flow path switching device according to claim 2, wherein an interval between the first protrusion and the second protrusion is different from an interval between the first protrusion and the third protrusion.   The second protrusion is provided at a position of 180 degrees in the rotation direction from the first protrusion, and the third protrusion is provided at a position of 90 degrees in the rotation direction from the first protrusion. Item 4. The channel switching device according to Item 3.   The flow according to claim 1, wherein the driving device further includes a control unit that determines the position of the flow path switching plate by rotating the rotating member to determine a sensing time difference of the sensing protrusion. Road switching device. A flow path switching device that includes a first flow path and a second flow path with different air flow paths, and switches the flow paths so that air is blown by any one of the first flow path and the second flow path. A ventilation device comprising
The flow path switching device includes a flow path switching plate provided at a branch point of the first flow path and the second flow path, and a drive device that operates the flow path switching plate,
The driving device includes a motor rotating in one direction, a rotating member coupled to a rotating shaft of the motor, one end connected to the flow path switching plate, and the other end separated from the rotation center of the rotating member. A connecting member rotatably connected to the sensor, and a sensing device for detecting a rotational position of the rotating member,
The sensing device includes a plurality of sensing protrusions provided on the rotating member and a sensor for sensing the plurality of sensing protrusions, and at least one interval between the plurality of sensing protrusions is between other sensing protrusions. Ventilator characterized by being different from the interval.   The plurality of sensing protrusions include a first protrusion provided on an outer peripheral portion of the rotating member, a second protrusion provided on an outer peripheral portion of the rotating member opposite to the first protrusion, and the first protrusion. The ventilation apparatus according to claim 6, further comprising a third protrusion provided on an outer peripheral portion of the rotating member between the second protrusion.   The second projection is provided at a position 180 degrees in the rotation direction from the first projection, and the third projection is provided at a position 90 degrees in the rotation direction from the first projection. The ventilation device described.   The ventilation device according to claim 6, wherein the driving device further includes a control unit that determines the position of the flow path switching plate by rotating the rotating member to determine a sensing time difference of the sensing protrusion. apparatus. A main body case having a discharge flow path for discharging indoor air and an inflow flow path for inflow of outdoor air, and heat exchange between air discharged from the room to the outside and air flowing from the outside to the room A heat exchanger provided in the main body case, and the discharge flow path includes a heat exchange discharge flow path that passes through the heat exchanger and a bypass discharge flow path that bypasses the heat exchanger, and the heat exchange A ventilation device including a discharge channel and a channel switching device that selectively opens and closes the bypass discharge channel,
The flow path switching device includes a flow path switching plate provided at a branch point of the heat exchange discharge flow path and the bypass discharge flow path, and a drive device that operates the flow path switching plate.
The driving device includes a motor rotating in one direction, a rotating member coupled to a rotating shaft of the motor, one end connected to the flow path switching plate, and the other end separated from the rotation center of the rotating member. A connecting member rotatably connected to the sensor, and a sensing device that senses a rotational position of the rotating member,
The sensing device includes a plurality of sensing protrusions provided on the rotating member and a sensor for sensing the plurality of sensing protrusions, and at least one interval between the plurality of sensing protrusions is between other sensing protrusions. Ventilator characterized by being different from the interval.   The plurality of sensing protrusions include a first protrusion provided on an outer peripheral portion of the rotating member, a second protrusion provided on an outer peripheral portion of the rotating member opposite to the first protrusion, and the first protrusion. The ventilation device according to claim 10, further comprising a third projection provided on an outer peripheral portion of the rotating member between the second projection.   The second protrusion is provided at a position of 180 degrees in the rotation direction from the first protrusion, and the third protrusion is provided at a position of 90 degrees in the rotation direction from the first protrusion. Item 12. The ventilation device according to item 11.   The ventilation device according to claim 10, wherein the driving device further includes a control unit configured to determine a position of the flow path switching plate by rotating the rotating member and determining a sensing time difference of the protrusion. .

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