JP6360754B2 - Range food - Google Patents

Description

  The present invention relates to a range hood that collects oil by rotating a filter.

  A range hood that is installed above or around the cooker and collects smoke, oil particles, and odors generated by cooking and exhausts or circulates indoors has a filter for separating and collecting the oil from the collected air. Is provided. This filter increases the oil collection rate to prevent dirt on the blower and ducts downstream of the filter, and contributes to longer maintenance cycles and longer service life. The applicant of the present application has applied for a range hood equipped with a high collection filter that realizes a high oil collection rate by rotating (Patent Document 1).

  When stopping such a range hood from the operating state, if the motor that rotates the filter is turned off immediately upon receiving the stop command and the rotation speed is suddenly reduced and stopped, a filter having a larger inertia than the motor is generated. Since the motor rotates at a high speed, there is a problem that a pin provided as a filter detent on the shaft of the motor collides with a boss groove of the filter engaged with the pin, and a large impact sound is generated. Therefore, when stopping such a range hood, when a stop command is received, the rotation speed is gradually reduced so that the filter motor is not suddenly stopped from a high rotation speed, thereby preventing the generation of a large impact sound. It was out.

JP 2013-139945 A

  However, even if the rotational speed of the filter is controlled in this way, a gap is created between the rotation of the motor for the filter and the rotation of the filter when the filter is decelerated to a certain rotational speed. Repeatedly collided, and a continuous collision sound was generated.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a large impact generated between the filter motor and the filter between the operation state and the stop state. An object of the present invention is to provide a range hood that does not generate sound and continuous collision sound.

In order to solve the above-mentioned problems, a fan that generates an air flow, a filter that exists on the upstream side of the fan on the air flow path and has a hole through which the air flow passes, and a filter that rotates An electric motor, a control unit that controls rotation of the fan and the electric motor, and a signal output unit that outputs an operation / stop signal of the range hood to the control unit, the control unit rotating the fan and the electric motor at the same time When the stop signal is received from the signal output unit in the operating state, the rotation speed of the motor starts to decrease, the rotation of the fan is maintained until the rotation speed of the motor reaches a predetermined rotation speed, and the rotation speed of the motor reaches the predetermined rotation speed. A range hood is provided that turns off the motor when it becomes.
According to this, by gradually reducing the rotation speed of the filter (electric motor), the fan rotation is maintained until the rotation speed of the filter reaches a predetermined rotation speed, thereby maintaining the air flow generated by the fan. Thus, the range hood can be provided in which the filter is not pressed against the air flow and the engagement between the boss groove of the filter and the pin of the motor shaft is not loosened, and a large impact sound and a continuous collision sound are not generated. In addition, the rotational speed of the filter (electric motor) is gradually decreased, and when the filter reaches a predetermined rotational speed that is lower than the rotational speed in the operating state, turning off the electric power to the motor causes a large impact. Generation of sound can be prevented.

Further, the control unit may maintain the rotational speed of the fan in the operating state until the rotational speed of the electric motor reaches a predetermined rotational speed.
According to this, by the simple control of maintaining the rotational speed of the fan in the operating state immediately before receiving the stop signal until the rotational speed of the filter reaches a predetermined rotational speed, a large impact sound and a continuous collision sound are generated. Occurrence can be prevented.

Furthermore, the control unit may include gradually decreasing the rotational speed of the fan until the rotational speed of the electric motor reaches a predetermined rotational speed.
According to this, it is possible to shorten the time from when the stop signal is received until the fan stops completely by gradually decreasing the rotational speed of the fan until the rotational speed of the filter reaches a predetermined rotational speed. it can.

Furthermore, the control unit may control the rotation speed of the fan so that the rotation speed of the fan does not become a predetermined rotation speed or less until the rotation speed of the electric motor reaches a predetermined rotation speed.
According to this, the rotation speed of the fan does not become lower than the rotation speed that generates a flow of air that does not loosen the engagement between the boss groove of the filter and the pin of the shaft, so that the filter is stabilized. It becomes a rotation state, and generation | occurrence | production of a loud impact sound and a continuous collision sound can be prevented reliably.

Further, the control unit may turn off the energization of the fan when the rotation speed of the electric motor reaches a predetermined rotation speed.
According to this, it is possible to further reduce the time from when the stop signal is received until the fan stops completely.

Further, the control unit may control to start decreasing the fan rotation speed and gradually decrease the fan rotation speed to zero when the rotation speed of the electric motor reaches a predetermined rotation speed. .
According to this, a large impact sound generated between the groove of the boss provided in the fan and the pin provided in the electric motor shaft that rotates the fan can be reduced.

  As described above, according to the present invention, there is provided a range hood that does not generate a large impact sound and a continuous collision sound generated between the filter motor and the filter between the operation state and the stop state. be able to.

BRIEF DESCRIPTION OF THE DRAWINGS (A) Bottom view of the range hood of 1st Example which concerns on this invention, (B) The bottom view at the time of removing a baffle plate. (A) The perspective view seen from the lower right of the range hood of 1st Example which concerns on this invention at the time of removing the baffle plate, (B) The same enlarged perspective view. The (A) sectional view (in the II section of Drawing 1 (B)) and (B) the expanded sectional view of the range hood of the first example concerning the present invention. The control method (A) of the rotation of the filter and fan in the range hood of the first embodiment according to the present invention, and its modification (B). The variation of the filter and fan rotation control method in the range hood of the second embodiment according to the present invention. Variation of the filter and fan rotation control method in the range hood of the modified example of the second embodiment according to the present invention (part 1). The variation (the 2) of the control method of the filter and fan rotation in the range hood of the modification of 2nd Example which concerns on this invention. The other modification in the control method of filter and fan rotation in a range hood. The control method according to the rotational speed of the filter and fan of an operation state in the range hood which concerns on this invention. (A) When driving strongly just before receiving the stop signal, (B) When driving midway immediately before receiving the stop signal, (C) When driving weakly just before receiving the stop signal.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
<First Example>
With reference to FIG. 1 thru | or FIG. 3, the range hood 1 concerning a present Example is demonstrated. The range hood 1 has a thin hood portion 2 having a concave inner surface panel 5 on the inner surface for collecting steam, oily smoke and the like generated by cooking performed below or around. The hood portion 2 is connected to a blower box 3 connected to an exhaust duct (not shown) in the vicinity of the communication port 6 of the inner surface panel 5 located on the upper rear side. The blower box 3 is located on the back side of the curtain plate 9, and has a fan 4 that is a sirocco fan and generates an air flow D1 therein. Therefore, when the fan 4 is operated, the communication port 6 becomes negative pressure, and the air below the inner panel 5 is sucked through the communication port 6 and discharged to the outside through the exhaust duct. The communication port 6 communicates with the fan 4, and is located on the flow path of the air flow D <b> 1 generated by the fan 4 and on the upstream side of the air flow from the fan 4.

  The range hood 1 includes a disk-shaped filter 10 having a hole 11 through which an air flow D1 passes at the position of the communication port 6, and a shaft 21 connected to the center of the disk-shaped filter 10 to rotate the filter 10. 20, an electric motor attachment 40 for attaching the electric motor 20 to the inner surface panel 5, and an oil collecting member 30 that is attached to the inner surface panel 5 and arranged so as to surround the outer peripheral edge of the filter 10. Accordingly, the range hood 1 is on the flow path of the air flow D1 generated by the fan 4 and is present on the upstream side of the flow from the fan 4, and the hole through which the air flow passes from the bottom to the top in the drawing. The filter 10 having 11 is rotatably provided.

  Further, the range hood 1 includes a control unit 90 that controls the rotation of the fan 4 and the electric motor 20, and a signal output unit 91 that outputs an operation / stop signal of the range hood 1 to the control unit 90. The control unit 90 includes a known microcomputer including a control program describing a method for controlling the rotation of the fan 4 and the electric motor 20 described later. The signal output unit 91 is configured by a switch operated by the user of the range hood 1, and is disposed on the side surface on the front side of the hood unit 2. Of course, the present invention is not limited to this, and it may be configured to receive and output a signal from a remote controller separate from the range hood 1 or a cooker. Further, the signal output unit 91 may output not only the operation stop signal of the range hood 1 but also a signal instructing the change of the rotation speed of the fan 4 and the electric motor 20 to the control unit 90.

  The air below the inner panel 5 contains steam, oily smoke, etc. generated by cooking. When the fan 4 is operated, it exists in the communication port 6, that is, on the flow path of the air flow D <b> 1 generated by the fan 4. Thus, the air is sucked into the hole 11 of the filter 10 located on the upstream side of the fan 4 and passes through the hole 11. When the control unit 90 receives the operation signal from the signal output unit 91, the control unit 90 rotates the fan 4 to generate the air flow D <b> 1, and energizes the motor 20 with the filter 10 that is rotatably provided by the motor 20. Rotate. The range hood 1 collects oil contained in the air in the oil collecting member 30 by rotating the filter 10.

  The method for collecting oil will be described in detail. The warmed air rises toward the range hood 1 along with steam and smoke generated by cooking performed below the range hood 1. When the range hood 1 starts operation and the fan 4 starts to rotate, the fan 4 generates an air flow D1. Then, the air rising around the rectifying plate 7 is sucked from between the rectifying plate 7 and the inner surface panel 5, then passes through the hole 11 of the filter 10 and is sucked into the fan 4 in the blower box 3. Thereafter, the air is discharged from the blower box 3 to the exhaust duct.

  In the operating state, the control unit 90 rotates the electric motor 20 that rotates the filter 10 when the fan 4 that generates an air flow is rotated in order to collect oil smoke and the like generated by cooking of the range hood 1. Control as follows. The rotational speed per unit time of the filter 10 may be at least 230 rpm (Rotation Per Minute) or more, although it depends on the opening state of the filter hole. When the filter 10 rotates at a high speed at such a rotational speed, the surface of the filter 10 (portion 11 without the hole 11) drags the air in contact with the surface by a frictional force, and the movement is transmitted to nearby air due to the viscosity of the air. Thus, the movement of air is generated near the surface of the filter 10 and the filter 10 is rotating, so that the movement of the air is a vortex centered on the shaft 21.

  This spiral air movement occurs on both surfaces of the filter 10, that is, on both the lower surface and the upper surface of the filter 10, in other words, on both the upstream surface and the downstream surface of the filter 10. In the present embodiment, since the air flow generated by the fan 4 flows through the hole 11 of the filter 10, the movement of the spiral air is being separated from the surface of the filter 10 on the downstream side of the filter 10. A spiral flow toward the outer peripheral edge of the filter 10 is generated and sucked by the fan 4. On the other hand, on the upstream side of the filter 10, the movement of the vortex air is pressed against the surface of the filter 10, and a high-density air layer with a vortex flow toward the outer peripheral edge of the filter 10 is formed.

  Oil generated by cooking or the like flows along with the air flow and reaches the vicinity of the upstream surface of the filter 10. Some of the oil that has reached the vicinity of the upstream surface (oil with a relatively small particle size) is caused by a vortex flow toward the outer periphery of the dense air layer, and another part (with a relatively large particle size) Oil) is blown off in the direction of the outer peripheral edge of the filter 10 by colliding with the upstream surface of the filter 10 (the portion without the hole 11). As a result, the oil collecting member 30 provided so as to surround the outer peripheral edge of the disk-shaped filter 10 is collected and recovered. Therefore, the range hood 1 of the present embodiment hardly attaches oil to the downstream portion of the air flow path from the filter 10, and greatly reduces the trouble of cleaning / washing the fan 4, the exhaust duct, etc. downstream of the filter 10. can do.

  Such a range hood 1 uses a conventional slot filter, HEPA filter, etc., and has a small pressure loss as compared to improving the oil collecting efficiency by making slits and eyes fine or overlapping to form a multilayer. It can have high oil collection efficiency in the state. Therefore, it is possible to obtain a high oil collection efficiency while maintaining a low ventilation resistance as compared with the conventional filter. In addition, the filter is less likely to clog due to oil adhering to the filter, thereby reducing the cleaning effort of the filter itself and preventing an increase in pressure loss as it is used. Since the oil hardly adheres to the downstream portion, it is possible to provide a range hood that greatly reduces the trouble of cleaning / washing the downstream portion from the filter.

  The type of the fan 4 is not particularly limited, and may be another fan such as an axial fan that generates an air flow. Preferably, it is a sirocco fan with a high static pressure used for the present Example. Further, below the hood portion 2, a rectifying plate 7 that is detachable from the hood portion 2 and has a gap between the hood portion 2 and increases the suction force is provided. Although the range hood 1 in the present embodiment includes the current plate 7, the presence of the current plate 7 is not particularly limited and may or may not be present. When the rectifying plate is not present or when the rectifying plate is removed, the inner surface of the hood part 2 is provided so as to surround the concave inner panel 5, the disk-shaped filter 10, and the outer periphery of the filter 10. The oil collecting member 30 is visible directly from the user.

  As will be described later, the control unit 90 performs various controls on the electric motor 20 that rotates the filter 10, but in addition to that, when the user operates a signal output unit 91 including an operation switch, The user may be able to control the rotation of the flexible filter. The signal output unit 91 can start rotation of the fan 4 and the electric motor 20, end the rotation, change the rotation speed, and the like by a user's operation. Further, as a maintenance operation of the filter 10, an operation of automatically stopping after rotating only the electric motor 20 for a predetermined time may be performed.

  In this embodiment, the portions other than the holes 11 on the surfaces on both sides of the filter 10 are smooth surfaces that are flat and smooth without protrusions and irregularities, but are not limited to this, and are not limited to general slots. There may be protrusions such as cut and raised together with slits (holes) like a filter. If the filter has a smooth surface as in this embodiment, the ventilation resistance of the air flow in the filter is further reduced, and further, the rotational resistance of the filter is also reduced, so the electric motor for rotating the filter has a small torque. Things are enough. Moreover, since there is no protrusion such as a cut and raised on the filter, it is possible to provide a range hood with low noise for cutting air. Further, these make it easy to rotate the filter at high speed. In addition, most of the oil is collected on the surface of the filter, and almost no oil is collected on the side of the filter hole, so the filter hole is less likely to be clogged with oil, and further cut and raised. Since there are no protrusions, the filter itself can be easily cleaned / washed.

  The filter 10 having a circular outer shape passes through the center hole provided in the center of the filter so that the surface of the filter 10 is perpendicular to the shaft 21 at the tip of the shaft 21 of the electric motor 20, and the detachable tool 14. It is attached detachably using. The shaft 21 has two pins 22 protruding from the shaft 21 in a direction perpendicular to the rotation axis. Moreover, the filter 10 has the boss | hub 12 which has the groove | channel which the pin 22 engages around a center hole. When the filter 10 is attached to the shaft 21, the tip end portion of the shaft 21 is inserted into the center hole of the filter 10, and the groove of the boss 12 is pushed so that the pin 22 is firmly engaged. Is fixed to the shaft 21. Thus, when the filter 10 is stationary, the filter 10 and the shaft 21 of the electric motor 20 are firmly engaged and fixed.

  However, when the range hood 1 is stopped from the operating state, that is, when the fan 4 and the filter 10 are changed from the operating state to the stopped state, the energization of the motor 20 that rotates the filter 10 immediately after receiving the stop command is turned off. If the rotation speed is suddenly reduced to stop the rotation, the filter 10 having a larger inertia than the motor 20 rotates at a high speed. Therefore, the pin 22 provided as a detent for the filter 10 on the shaft 21 of the motor 20. May collide with the groove of the boss 12 engaged with the pin 22 to generate a large impact sound.

  In order to avoid such a problem, when the filter 10 is stopped, the filter 20 may be gradually decreased so that the motor 20 is not suddenly stopped from a high rotation speed after receiving the stop command. When the motor 10 is decelerated to a certain rotational speed, a gap is created between the rotation of the electric motor 20 and the rotation of the filter 10, which causes the pin 22 and the boss groove to repeatedly collide and generate a continuous collision sound. There is. In the present embodiment, this problem is solved by controlling the rotational speed of the motor 20 and the fan 4 that rotate the filter 10 described below.

  FIG. 4 shows a method of controlling the rotational speeds of the filter 10 (electric motor 20) and the fan 4 by the control unit 90 in the present embodiment. In the operating state before receiving the stop signal from the signal output unit 91, the control unit 90 rotates the filter 10 and the fan 4 at a certain rotational speed. In the operating state, the control unit 90 rotates the filter 10 at a rotational speed of, for example, 800 rpm to 1500 rpm, and the fan 4 at a rotational speed of, for example, 420 rpm to 1500 rpm.

  When the control unit 90 receives the stop signal from the signal output unit 91 in the operating state in which the fan 4 and the electric motor 20 are simultaneously rotated, the control unit 90 starts to gradually decrease the rotational speed of the electric motor 20 from the rotational speed in the operating state. That is, when the control unit 90 receives a stop signal from the signal output unit 91 in the operating state, for example, the control unit 90 does not perform control such that the energization is turned off and the rotation speed of the filter 10 is suddenly made zero. Control is performed so that the rotational speed of 20 is gradually reduced. The method for decelerating the rotational speed may be linear as shown in the figure or may be a gentle curve.

  As a result of gradually reducing the rotational speed of the electric motor 20, the control unit 90 turns off the electric power of the electric motor 20 when the rotational speed of the electric motor 20 becomes a predetermined rotational speed (referred to as a set value in the figure, hereinafter the same). Thus, the rotational speed is controlled to be suddenly zero. At that time, the control unit 90 may not only turn off the electric power of the electric motor 20 but also include a separate braking mechanism so that the rotation speed is abruptly made zero. The predetermined rotational speed of the electric motor 20 is a rotational speed that is slightly higher than the rotational speed at which a continuous collision noise starts to occur in the process of gradually decelerating. The predetermined rotation speed varies depending on the specifications and characteristics of the electric motor 20 and the size and weight of the filter 10. For example, the predetermined rotation speed is about 1470 rpm.

  On the other hand, the control unit 90 maintains the rotation of the motor for the fan 4 until the rotation speed of the electric motor 20 reaches a predetermined rotation speed. Further, in this embodiment, the control unit 90 not only maintains the rotation of the fan 4 until the rotation speed of the electric motor 20 reaches a predetermined rotation speed, but also rotates the fan in the operating state immediately before the stop signal is input. Maintain speed. Thus, the following significant effects can be obtained by simple control of maintaining the rotational speed of the operating fan immediately before receiving the stop signal.

  That is, while maintaining the flow of air generated by the fan by maintaining the rotation of the fan 4 until the rotation speed of the filter 10 reaches a predetermined rotation speed while gradually decreasing the rotation speed of the filter 10 (the electric motor 20). Thus, the filter 10 is not pressed against the air flow, and the engagement between the groove of the boss 12 of the filter 10 and the pin 22 of the electric motor shaft 21 is not loosened, and a range in which a large impact sound and a continuous collision sound are not generated. The food 1 can be provided. Further, the rotational speed of the filter 10 (the electric motor 20) is gradually decreased, and when the filter 10 reaches a predetermined rotational speed that is lower than the rotational speed in the operating state, the energization of the electric motor 20 is turned off. , Can prevent the generation of loud impact sound.

  Further, the control unit 90 controls the rotation speed of the fan 4 to be zero when the rotation speed of the electric motor 20 reaches a predetermined rotation speed. This figure (A) shows that the control part 90 controls to turn off the energization of the fan 4 when the rotational speed of the electric motor 20 reaches a predetermined rotational speed. The control unit 90 may not only turn off the energization, but may be provided with a separate braking mechanism so that the rotation speed is suddenly made zero. By doing so, in the range hood 1, when the operation state is changed from the operation state to the stop state, the time until the fan 4 is completely stopped after the stop operation by the signal output unit 91 can be shortened.

<Modification of the first embodiment>
The control unit 90 may start the rotation speed of the fan 4 when the rotation speed of the electric motor 20 reaches a predetermined rotation speed, and gradually decrease the rotation speed of the fan 4 to zero. This figure (B) shows that the control part 90 begins to reduce the rotational speed of the fan 4 when the rotational speed of the electric motor 20 becomes a predetermined rotational speed. Then, the controller 90 does not suddenly reduce the rotational speed to zero as in the above-described figure (A), but controls the rotational speed of the fan 4 to be gradually reduced to zero. By doing so, even if an impact sound is generated, in the range hood 1, the groove of the boss 12 provided in the filter 10 and the pin 22 provided in the electric motor shaft 21 that rotates the filter 10. The impact sound generated between the two can be reduced to a smaller sound.

  In addition, after the rotational speed of the electric motor 20 reaches a predetermined rotational speed, the motor for the fan 4 is operated with the output at that time for a certain period of time, so that the regenerative energy generated by the electric motor 20 is consumed by the motor for the fan 4. May be. By doing so, power consumption can be reduced even if the time until the fan 4 completely stops increases. Further, the overvoltage can be suppressed, and therefore the load applied to the smoothing capacitor is reduced, leading to a longer life of the smoothing capacitor. Further, since the voltage applied to the smoothing capacitor is suppressed from when the stop operation is performed at the signal output unit 91 until the fan 4 is completely stopped, a smoothing capacitor having a low rated voltage can be used, and thus smoothing is possible at low cost. It can be changed to a capacitor.

<Second Example>
With reference to FIG. 5, the range hood which concerns on a present Example is demonstrated. In order to avoid repeated description, the differences from the above embodiment will be mainly described. The range hood in this embodiment is different from the above embodiment only in the control method of the fan and the filter (electric motor) of the control unit 90A (shown in FIG. 3A), and the physical structure is the same. The other symbols of the target element use the same symbols.

  When the controller 90A in the present embodiment receives a stop signal from the signal output unit 91 in the operating state in which the fan 4 and the electric motor 20 are simultaneously rotated, the rotational speed of the electric motor 20 is gradually reduced from the rotational speed in the operating state. At the same time, control is performed to include gradually decreasing the rotational speed of the fan 4 until the rotational speed of the electric motor 20 reaches a predetermined rotational speed. On the other hand, the controller 90A controls the fan 4 motor to stop after the filter 10 (the electric motor 20) is completely stopped so that the fan 4 motor does not stop first.

  For example, as shown in FIG. 6A, when the control unit 90A receives the stop signal, the control unit 90A starts to gradually reduce the electric motor 20, and the fan 4 is rotated until the rotational speed of the electric motor 20 reaches a predetermined rotational speed. The rotational speed is also controlled so as to gradually decrease linearly. Then, the controller 90A turns off the energization of the electric motor 20 when the rotation speed of the electric motor 20 reaches a predetermined rotation speed, and also turns off the energization of the motor for the fan 4, and sets the rotation speed of the fan 4 to zero. Control to be.

  Further, as shown in FIG. 5B, when the control unit 90A receives the stop signal, the controller 90A starts to gradually reduce the electric motor 20, and the fan 4 until the rotational speed of the electric motor 20 reaches a predetermined rotational speed. Is controlled so as to include gradually decreasing the rotation speed more linearly than shown in FIG. 3A and maintaining a constant rotation speed without gradually decreasing thereafter. Then, the controller 90A turns off the energization of the electric motor 20 when the rotation speed of the electric motor 20 reaches a predetermined rotation speed, and also turns off the energization of the motor for the fan 4, and sets the rotation speed of the fan 4 to zero. Control to be.

  Further, as shown in FIG. 5C, when the control unit 90A receives the stop signal, the controller 90A starts to gradually reduce the electric motor 20, and the fan 4 until the rotational speed of the electric motor 20 reaches a predetermined rotational speed. Is controlled so as to be gradually decreased until the rotation speed is linearly substantially the same as the predetermined rotation speed. Then, the controller 90A turns off the energization of the electric motor 20 when the rotation speed of the electric motor 20 reaches a predetermined rotation speed, and also turns off the energization of the motor for the fan 4, and sets the rotation speed of the fan 4 to zero. Control to be.

  For example, as shown in FIG. 4D, when the control unit 90A receives the stop signal, the control unit 90A starts to gradually reduce the electric motor 20, and the fan 4 is rotated until the rotation speed of the electric motor 20 reaches a predetermined rotation speed. The rotational speed is also controlled so as to gradually decrease linearly. Then, the control unit 90A turns off the electric power of the electric motor 20 when the rotational speed of the electric motor 20 reaches a predetermined rotational speed, and continuously decreases the rotational speed of the fan 4 linearly so as to become zero. To control.

  Further, as shown in FIG. 9E, when the control unit 90A receives the stop signal, the controller 90A starts to gradually reduce the electric motor 20, and the fan 4 until the rotational speed of the electric motor 20 reaches a predetermined rotational speed. Is controlled so as to include gradually decreasing the rotation speed linearly, and maintaining a constant rotation speed without decreasing gradually thereafter, as shown in FIG. Then, the control unit 90A controls to turn off the electric power of the electric motor 20 when the rotational speed of the electric motor 20 reaches a predetermined rotational speed, and further linearly gradually reduce the rotational speed of the fan 4 to zero. To do.

  Further, as shown in FIG. 4F, when the control unit 90A receives the stop signal, the control unit 90A starts to gradually reduce the electric motor 20, and the fan 4 until the rotational speed of the electric motor 20 reaches a predetermined rotational speed. Is controlled so as to be gradually decreased until the rotation speed is linearly substantially the same as the predetermined rotation speed. Then, the control unit 90A controls to turn off the electric power of the electric motor 20 when the rotational speed of the electric motor 20 reaches a predetermined rotational speed, and further linearly gradually reduce the rotational speed of the fan 4 to zero. To do.

  Thus, by gradually reducing the rotational speed of the fan 4 until the rotational speed of the filter 10 reaches a predetermined rotational speed, the time from when the stop signal is received until the fan 4 is completely stopped is not gradually reduced. It can be shortened compared to the case.

<Modification of the second embodiment>
As shown in FIG. 6, when the control unit 90A receives the stop signal in the operating state, the control unit 90A starts to gradually decrease the rotation speed of the electric motor 20, and until the rotation speed of the electric motor 20 reaches a predetermined rotation speed, Control is performed so as to include a gradual decrease in the rotational speed of the fan 4, but control is performed so that the rotational speed of the fan 4 does not fall below a predetermined rotational speed until the rotational speed of the electric motor 20 reaches a predetermined rotational speed. The predetermined rotation speed of the fan 4 (referred to as a predetermined value in the figure, hereinafter the same) means that the air flow generated by the rotation of the fan 4 presses the filter 10, and the groove of the boss 12 of the filter 10. The rotational speed at which the engagement of the motor shaft 21 with the pin 22 does not loosen. The predetermined rotation speed varies depending on the specifications and characteristics of the electric motor 20 and the size and weight of the filter 10. For example, the predetermined rotation speed is about 1000 rpm.

  For example, as shown in FIG. 4A, when the control unit 90A receives the stop signal, the controller 90A starts to gradually decrease the rotation speed of the electric motor 20 and until the rotation speed of the electric motor 20 reaches a predetermined rotation speed. Then, the rotational speed of the fan 4 is linearly decreased gradually to a predetermined rotational speed, and thereafter, the predetermined rotational speed is maintained without being gradually decreased. Then, the control unit 90A controls to turn off the electric power of the electric motor 20 when the rotational speed of the electric motor 20 reaches a predetermined rotational speed, and further linearly gradually reduce the rotational speed of the fan 4 to zero. To do.

  Further, as shown in FIG. 4B, when the control unit 90A receives the stop signal, the control unit 90A starts to gradually decrease the fan 4, and until the rotational speed of the fan 4 reaches a predetermined rotational speed, The rotational speed is also linearly gradually decreased to a predetermined rotational speed, and thereafter, the predetermined rotational speed is maintained without being gradually decreased. 90 A of control parts maintain the rotational speed of the electric motor 20 at a predetermined rotational speed, when the rotational speed of the electric motor 20 becomes a predetermined rotational speed before the rotational speed of the fan 4 becomes a predetermined rotational speed. Then, when the rotational speed of the fan 4 reaches a predetermined rotational speed, the control unit 90A turns off the electric power of the electric motor 20 and continuously decreases the rotational speed of the fan 4 linearly to become zero. To control.

  By doing so, the rotational speed of the fan 4 does not become lower than the rotational speed that generates a flow of air that does not loosen the engagement between the boss groove of the filter 10 and the pin 22 of the shaft 21. The filter 10 is in a stable rotating state, and it is possible to reliably prevent the generation of a large impact sound and a continuous collision sound.

  Further, as shown in FIG. 7, in this modification, the control unit 90A receives a stop signal when the rotation speed of the fan 4 motor is lower than the specified rotation speed at the time of receiving the stop signal. You may control so that the rotational speed when a stop signal is received after that may be maintained. Then, when the rotation speed of the filter 10 reaches a predetermined rotation speed, the control unit 90A controls the electric motor 20 to be turned off so that the rotation speed of the filter 10 suddenly becomes zero and the rotation speed of the fan 4 Is gradually reduced linearly to control to zero. By doing so, even when the fan 4 motor is below the predetermined rotational speed when the stop signal is received, the fan 4 motor does not perform a wasteful operation.

<Other variations>
As shown in FIG. 8, when the rotation speed of the electric motor 20 is lower than a predetermined rotation speed when the stop signal is received in the operating state, the energization of the electric motor 20 is turned off immediately after receiving the stop signal. Thus, control is performed to suddenly reduce the rotation speed of the electric motor 20 to zero. When the fan 4 receives the stop signal, the fan 4 starts to decrease the rotational speed of the fan 4 and controls it to gradually decrease to zero. By doing so, since the filter 10 stops immediately after receiving the stop signal, the time until the fan 4 stops can be further shortened.

  Although the rotational speeds of the filter 10 and the fan 4 in the above-described operating state have been described as one value, various rotational speeds may be used as shown in FIG. This figure (A) shows when the range hood 1 in the operating state immediately before receiving the stop signal is in a strong operation, this figure (B) is a middle operation, and (C) is a weak operation. Indicates when. Although the control of the rotation of the filter 10 and the fan 4 of the control unit 90A is the same as the control shown in FIG. 4B, it is needless to say that the control is not limited to this.

  This figure (A) shows that when the control unit 90A is in an operating state with a strong operation, when it receives a stop signal, the rotational speed of the electric motor 20 starts to gradually decrease from the rotational speed in the operating state, and the electric motor gradually As a result of reducing the rotational speed of the motor 20, when the rotational speed of the electric motor 20 reaches a predetermined rotational speed (referred to as a set value 1 in the figure), the electric power of the electric motor 20 is turned off and the rotational speed is suddenly made zero. It shows that it controls. The predetermined rotational speed (set value 1) is a rotational speed that is slightly higher than the rotational speed at which a continuous collision sound starts to occur in the process of gradually decelerating from the rotational speed of the strong operation.

  On the other hand, the controller 90A maintains the rotation speed of the motor for the fan 4 until the rotation speed of the electric motor 20 reaches a predetermined rotation speed (set value 1), and gradually reduces the rotation speed of the fan 4 to zero. Control to do. That is, the air generated by the fan while maintaining the rotational speed of the fan 4 until the rotational speed of the filter 10 reaches a predetermined rotational speed (set value 1) while gradually decreasing the rotational speed of the filter 10 (electric motor 20). By maintaining the flow of air, the filter 10 is pressed toward the air flow, so that the engagement between the groove of the boss 12 of the filter 10 and the pin 22 of the electric motor shaft 21 is not loosened. Generation of collision sound can be avoided.

  Further, FIG. 7B shows that when the control unit 90A receives a stop signal when it is in the operation state during the middle operation, the rotation speed of the electric motor 20 starts to gradually decrease from the rotation speed in the operation state. When the rotational speed of the electric motor 20 reaches a predetermined rotational speed (referred to as a setting value 2 in the figure) as a result of reducing the rotational speed of the electric motor 20, the electric power of the electric motor 20 is turned off and the rotational speed of the fan 4 is turned off. Indicates that the speed is gradually reduced to zero.

  Further, FIG. 6C shows that when the control unit 90A receives a stop signal when the controller 90A is in a weak operation, the controller 90A starts to gradually decrease the rotation speed of the motor 20 from the rotation speed in the operation state. When the rotational speed of the electric motor 20 reaches a predetermined rotational speed (referred to as a set value 3 in the figure) as a result of reducing the rotational speed of the electric motor 20, the motor 20 is turned off and the rotational speed of the fan 4 is turned off. Indicates that the speed is gradually reduced to zero.

  Note that the set value 1 which is a predetermined rotation speed in the strong operation is smaller than the set value 2 and the set value 3 which are the predetermined rotation speeds in the medium operation and the weak operation, and the set value 1 <the set value 2 <the set value 3 The relationship is preferred. When the range hood is in operation, the fan rotates at a higher speed during strong operation than during weak operation. Therefore, the engagement between the boss groove of the filter and the pin of the shaft becomes a stronger engagement state and rotates in a stable state. The number of rotations can be set low.

  Therefore, the control unit 90 changes the rotation speed of the fan 4 in multiple stages such as strong, medium, and weak in the operating state, and changes the rotation speed of the electric motor 20 in accordance with the rotation speed of each of the multi-stage fans 4. The predetermined rotation speed of the electric motor 20 may be controlled so as to correspond to the rotation speed of each of the multi-stage electric motors 20 in the operating state immediately before receiving the stop signal. According to this, even when there are a plurality of operating fan rotation speeds immediately before receiving the stop signal, the predetermined rotation speed can be made to correspond to the rotation speed.

  In addition, this invention is not limited to the illustrated Example, The implementation by the structure of the range which does not deviate from the content described in each item of a claim is possible. That is, the invention has been illustrated and described with particular reference to particular embodiments, but with respect to the embodiments described above, without departing from the scope and spirit of the invention, the shape, material Various modifications can be made by those skilled in the art in terms of quantity, other details, and the like. Therefore, the description limited to the shape disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description in the name of the member excluding a part or all of the limitation is included in the present invention.

DESCRIPTION OF SYMBOLS 1 Range hood 2 Hood part 3 Blower box 4 Fan 5 Inner panel 6 Communication port 7 Current plate 9 Curtain plate 10 Filter 11 Hole 12 Boss 14 Detachment tool 20 Electric motor 21 Shaft 22 Pin 30 Oil collecting member 40 Electric motor mounting tool 50 Mounting board 90 Control section 91 Signal output section D1 Air flow direction

Claims (6)

A fan that generates air flow,
A filter present on the upstream side of the fan on the air flow path and having a hole through which the air flow passes;
An electric motor for rotating the filter;
A control unit for controlling rotation of the fan and the electric motor;
A signal output unit for outputting an operation / stop signal of the range hood to the control unit;
With
When the control unit receives a stop signal from the signal output unit in an operating state in which the fan and the electric motor are simultaneously rotated, the control unit starts to reduce the rotational speed of the electric motor, and the rotational speed of the electric motor reaches a predetermined rotation speed. Maintaining the rotation of the fan until the speed reaches, and turning off the energization of the motor when the rotation speed of the motor reaches the predetermined rotation speed,
Range food.   The range hood according to claim 1, wherein the control unit maintains the rotational speed of the fan in the operating state until the rotational speed of the electric motor reaches the predetermined rotational speed.   The range hood according to claim 1, wherein the control unit includes gradually decreasing the rotation speed of the fan until the rotation speed of the electric motor reaches the predetermined rotation speed.   The range hood according to claim 3, wherein the control unit controls the rotation speed of the fan not to become a predetermined rotation speed or less until the rotation speed of the electric motor reaches the predetermined rotation speed. .   The range hood according to any one of claims 2 to 4, wherein the controller turns off the energization of the fan when the rotation speed of the electric motor reaches the predetermined rotation speed.   The control unit starts to decrease the rotation speed of the fan when the rotation speed of the electric motor reaches the predetermined rotation speed, and controls the rotation speed of the fan to gradually decrease to zero. The range hood according to any one of claims 2 to 4.