CN112377963A

CN112377963A - Smoke exhaust ventilator

Info

Publication number: CN112377963A
Application number: CN202011336357.9A
Authority: CN
Inventors: 阿部宽之
Original assignee: Fuji Kogyo Co Ltd
Current assignee: Fuji Kogyo Co Ltd
Priority date: 2016-12-27
Filing date: 2017-12-25
Publication date: 2021-02-19
Anticipated expiration: 2037-12-25
Also published as: TWI734884B; MY193141A; WO2018123512A1; TWI762360B; MY191082A; TW201825836A; TW202142812A; CN112377963B; JP6382929B2; JP2018105568A; CN108240673A

Abstract

The invention provides a range hood with a rotary filter, which can reduce the possibility of noise generation. Provided is a range hood (1) which is provided with: a fan (4) that generates an air flow; a filter (10) which is located upstream of the fan in the flow path of the air flow and has a hole for passing the air flow; a motor (20) that rotates the filter; a control unit (30) that controls the rotation of the motor so that the motor rotates at a first rotational speed and a second rotational speed that is faster than the first rotational speed, the first rotational speed being at least two rotational speeds; and a cooking state monitoring unit (40) that monitors the cooking state of the cooking device, wherein the control unit controls the rotation speed of the motor at the first rotation speed and the second rotation speed according to the cooking state monitored by the cooking state monitoring unit.

Description

Smoke exhaust ventilator

The application is a divisional application of an application with application date of 2017, 12 and 25 months and application number of 201711419483.9 and invented name of 'smoke exhaust ventilator'.

Technical Field

The present invention relates to a range hood, and more particularly, to a range hood having a filter rotated.

Background

Conventionally, a range hood that rotates a filter during an exhaust operation has been proposed. For example, patent document 1 discloses a range hood having a small pressure loss and a high oil trapping efficiency. The range hood is provided with: a fan generating an air flow; a filter which is present on the upstream side of the fan in the flow path of the air flow and has a hole for passing the air flow; a motor that rotates the filter; an oil trapping member surrounding the filter; and a control unit that controls rotation of the fan and the motor.

Patent document 1: japanese patent laid-open publication No. 2013-139945

However, such a range hood may generate noise such as wind noise when the filter rotates at a high speed.

Disclosure of Invention

Accordingly, the present invention provides a range hood that reduces the chance of noise generation.

In order to solve the above problem, a range hood provided above or near a cooker, includes: a fan generating an air flow; a filter which is present on the upstream side of the fan in the flow path of the air flow and has a hole for passing the air flow; a motor that rotates the filter; a control unit that controls rotation of the motor so that the motor rotates at least two rotation speeds, namely, a first rotation speed and a second rotation speed that is faster than the first rotation speed; and a cooking state monitoring unit that monitors a cooking state in the cooker, wherein the control unit controls the rotation speed of the motor at the first rotation speed and the second rotation speed according to the cooking state monitored by the cooking state monitoring unit.

According to the above, it is possible to provide a range hood that controls the rotation speed of the motor that rotates the filter in accordance with the cooking state, thereby rotating the filter at a high speed only when necessary and reducing the chance of noise generation.

Further, the following structure may be characterized: the range hood further includes a determination unit that determines whether or not soot exceeding a predetermined threshold is generated based on the cooking state monitored by the cooking state monitoring unit, and the control unit rotates the motor at the second rotation speed when the determination unit determines that soot exceeding the predetermined threshold is generated.

According to the above, when the soot is generated at a predetermined threshold or more, the filter is rotated at a high speed, so that the possibility of generating loud noise can be reduced.

Further, the following structure may be characterized: when the determination unit determines that the soot equal to or larger than the predetermined threshold value is generated and then determines that the soot equal to or larger than the predetermined threshold value is not generated, the control unit immediately stops the rotation of the motor, immediately rotates the rotation of the motor at the first rotation speed, stops the rotation of the motor after maintaining the second rotation speed for the predetermined time, or rotates the rotation of the motor at the first rotation speed after maintaining the second rotation speed for the predetermined time.

According to the above, when the soot above the predetermined threshold value is not generated any more, the filter is controlled to be slow or stopped, and the possibility of noise generation can be reduced.

Further, the following structure may be characterized: the airflow rate of the air flow generated by the fan has at least two airflow rates, namely a first airflow rate and a second airflow rate larger than the first airflow rate, the second rotation speed when the fan generates the second airflow rate is higher than the second rotation speed when the fan generates the first airflow rate, and the first rotation speed when the fan generates the second airflow rate is higher than the first rotation speed when the fan generates the first airflow rate.

According to the above, since noise generated by the filter is buried when the fan generating the air flow rotates at a high speed, it is difficult to consider the noise even when the rotation speed of the filter is set to a high speed in this case, and therefore, by controlling the rotation speed of the filter in accordance with the high-speed rotation and the low-speed rotation of the fan, it is possible to reduce the chance of noise generation and maintain a high oil trapping efficiency. Further, the flow velocity of the soot passing through the filter varies depending on the air volume, and therefore the required rotation speed of the filter varies. Therefore, the first and second rotational speeds can be slowed when the relative air flow rate is small, and noise generated by the rotation of the filter can be reduced while maintaining high oil trapping efficiency.

Further, the following structure may be characterized: the cooking state monitoring unit is separate from the hood and performs wireless communication with the control unit.

According to the above, the cooking state monitoring unit is separate from the range hood and can be disposed at a position suitable for the monitoring target.

As described above, according to the present invention, it is possible to provide a range hood that rotates a filter at a high speed only when necessary, thereby reducing the chance of noise generation.

Drawings

Fig. 1 is a view of a range hood according to a first embodiment of the present invention installed in a kitchen, where fig. 1 (a) is a front view and fig. 1 (B) is a side view.

Fig. 2 is a view of a range hood according to a first embodiment of the present invention, in which fig. 2 (a) is a bottom view and fig. 2 (B) is a bottom view when a rectifying plate is removed.

Fig. 3 is a sectional view of the section I-I of fig. 2 of the hood according to the first embodiment of the present invention.

Fig. 4 is a view of a hood according to a first embodiment of the present invention, in which fig. 4 (a) is a perspective view and fig. 4 (B) is an enlarged perspective view.

Fig. 5 is a flowchart showing a method of controlling the range hood according to the first embodiment of the present invention.

Fig. 6 is a flowchart showing a method of controlling the range hood according to the first modification of the first embodiment of the present invention.

Fig. 7 is a flowchart showing a method of controlling the range hood according to the second modification of the first embodiment of the present invention.

Fig. 8 is a flowchart showing a method of controlling the range hood according to a third modification of the first embodiment of the present invention.

Fig. 9 is a view of a range hood according to a second embodiment of the present invention installed in a kitchen, where fig. 9 (a) is a front view and fig. 9 (B) is a side view.

Fig. 10 is a view of a range hood according to a third embodiment of the present invention installed in a kitchen, where fig. 10 (a) is a front view and fig. 10 (B) is a side view.

Fig. 11 is a view of a range hood according to a fourth embodiment of the present invention installed in a kitchen, in which fig. 11 (a) is a front view and fig. 11 (B) is a side view.

Description of reference numerals:

1 … cooker hood; 2 … cover part; 3 … blower box; 4 … fan; 5 … inner surface panel; 6 … communication port; 7 … fairing; 9 curtain plates 9 …; 10 … filter; 11 … holes; 20 … electric motor; 30 … control section; 40 … cooking state monitoring part; a 50 … determination unit; 60 … oil trap member; 70 … operating part; d1 … direction of air flow; CD … cooker.

Detailed Description

Hereinafter, each embodiment will be described with reference to the drawings.

< first embodiment >

A Range hood (Range hood)1 according to the present embodiment will be described with reference to fig. 1 to 4. The hood 1 is installed in a kitchen where a cooker CD is installed, and as shown in fig. 1, is disposed above the cooker CD to collect soot, hot air, and the like generated by cooking in the cooker CD, and discharges cleaned air to the outside or the like. The Hood 1 has a thin Hood (Hood) section 2 for collecting soot and the like generated by cooking performed downward, and the Hood section 2 has an inner surface panel 5 recessed upward on the inner surface. Further, although the hood 1 of the present embodiment is disposed above the cooker CD, it may be disposed in the vicinity of the side of the cooker CD.

As shown in fig. 2 to 4, the cover 2 is connected to a blower case 3 connected to an exhaust duct (not shown) near a communication port 6 of an inner surface panel 5 located at the upper rear side. The blower case 3 is located on the back side of the curtain plate 9, and has a fan 4 as a sirocco fan (sirocco fan) therein and generating an air flow D1. Therefore, when the fan 4 is operated, the communication port 6 becomes a negative pressure, and air below the inner surface 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 upstream side of the fan 4 with respect to the flow of the air flow D1 generated by the fan 4.

The range hood 1 includes: a disc-shaped filter 10 having a hole 11 through which an air flow D1 passes at the position of the communication port 6; a motor 20 for rotating the disc-shaped filter 10 by connecting a shaft to the center of the filter 10; and an oil trapping member 60 attached to the inner surface panel 5 and disposed so as to surround the outer periphery of the filter 10. Therefore, the hood 1 includes the rotatable filter 10, and the filter 10 is present on the upstream side of the flow of the air D1 generated by the fan 4 in the flow path of the air, and has the hole 11 through which the air passes from below to above in the view of the drawing.

Further, the range hood 1 includes: a control unit 30 for controlling the rotation of the fan 4 and the motor 20; and an operation unit 70 that receives an operation by a user and outputs an operation/stop signal of the hood 1 to the control unit 30. The control unit 30 is constituted by a known microcomputer including a control program and the like in which a method of controlling the rotation of the fan 4 and the motor 20 described later is recorded. The operation unit 70 is configured by a switch to be operated by a user of the hood 1, and is disposed on a front side surface of the hood section 2. Of course, the present invention is not limited to this, and may be configured such that: receives and outputs a signal from a remote controller or a cooker which is separate from the hood 1. The operation unit 70 outputs to the control unit 30 not only an operation signal and a stop signal of the hood 1 but also a signal instructing to change the rotation speed of the fan 4 and the motor 20.

The air below the inner surface panel 5 includes hot air, soot, and the like generated by cooking, and when the fan 4 is operated, the air is drawn to the filter 10 existing in the communication port 6, that is, the hole 11 of the filter 10 located on the upstream side of the fan 4 in the flow path of the air flow D1 generated by the fan 4, and passes through the hole 11. Upon receiving the operation signal from operation unit 70, control unit 30 rotates fan 4 to generate air flow D1, and also rotates filter 10, which is rotatably provided, by energizing motor 20. The range hood 1 collects oil contained in air in the oil collecting member 60 by rotating the filter 10.

The method of trapping oil is described in detail. The heated air rises toward the hood 1 side together with hot air, soot, and the like generated by cooking performed below the hood 1. When the range hood 1 starts to operate and the fan 4 starts to rotate, the fan 4 generates an air flow. In this way, the air rising to the vicinity of the rectifying plate 7 is sucked in from between the rectifying plate 7 and the inner surface panel 5, and then is sucked in to the fan 4 in the blower case 3 through the holes 11 of the filter 10. Then, the air is discharged from the blower case 3 to the exhaust duct.

The control unit 30 performs control such that: when the range hood 1 rotates the fan 4 that generates an air flow to collect soot and the like generated by cooking in an operating state, the motor 20 that rotates the filter 10 is rotated. The rotation speed Per unit time of the filter 10 depends on the opening state of the pores of the filter, but may be at least 230rpm (rotation Per minute) or more. When the filter 10 is rotated at such a high speed, the surface (portion without the holes 11) of the filter 10 drags air in contact with the surface by friction, and this movement is transmitted to the air in the vicinity by the viscosity of the air, so that the movement of the air is generated in the vicinity of the surface of the filter 10, and the filter 10 performs a rotational movement, and therefore the movement of the air becomes a spiral shape centered on the axis of the motor 20.

The swirling air movement is generated on both surfaces of the filter 10, that is, both the lower surface and the upper surface of the filter 10, in other words, both the upstream side surface and the downstream side surface of the air flow of the filter 10. In the present embodiment, the air flow generated by the fan 4 flows through the holes 11 of the filter 10, and therefore, on the downstream side of the filter 10, the movement of the vortex-like air is carried away from the surface of the filter 10, and a spiral flow toward the outer periphery of the filter 10 is generated, being sucked by the fan 4. On the other hand, on the upstream side of the filter 10, the movement of the swirling air forms a high-density air layer which is pressed against the surface of the filter 10 and accompanies the swirling flow toward the outer periphery of the filter 10.

Oil generated by cooking or the like flows together with the air flow and reaches the vicinity of the upstream surface of the filter 10. The oil component reaching the vicinity of the upstream surface is partly (oil component having a relatively small particle diameter) flicked in the direction of the outer periphery of the filter 10 by the swirling flow of the high-density air layer toward the outer periphery, and the other part (oil component having a relatively large particle diameter) collides with the upstream surface of the filter 10 (the portion having no holes 11) and flicked in the direction of the outer periphery of the filter 10. As a result, the oil is collected and collected by the oil collecting member 60 provided so as to surround the outer periphery of the disc-shaped filter 10. Therefore, in the hood 1 of the present embodiment, oil hardly adheres to the portion of the air flow path downstream of the filter 10, and the trouble of cleaning and washing the fan 4, the exhaust duct, and the like downstream of the filter 10 can be significantly reduced.

On the other hand, the filter 10 rotates, particularly at a high speed, so that the air near the surface of the filter 610 moves faster, and a sound such as wind noise is generated. The hood 1 rotates the filter 10 at a high speed only when necessary, thereby reducing the chance of noise generation. The range hood 1 further includes: a cooking state monitoring unit 40 that monitors a cooking state in the cooking device CD, and a determination unit 50 that determines whether or not smoke equal to or greater than a predetermined threshold value is generated based on the cooking state monitored by the cooking state monitoring unit 40.

In the case of the present embodiment, the cooking state monitoring unit 40 is a smoke sensor that is provided at an end portion of the inner surface panel 5 and detects smoke in the air. The smoke sensor is not particularly limited as long as it can measure the concentration of particles in the air, and may be a system that irradiates light in the direction of the cooking device CD and measures the amount of scattered light of the light to detect the mass concentration of oil particles contained in oil smoke rising from the cooking device CD.

The determination unit 50 determines whether or not smoke is generated at a predetermined threshold value or more based on the cooking state monitored by the smoke sensor of the cooking state monitoring unit 40. The predetermined threshold value can be determined by obtaining in advance the mass concentration of oil particles contained in oil smoke at the time of cooking such as frying dishes or frying foods.

The control unit 30 controls the motor 20, i.e., the filter 10, to rotate at various rotation speeds, and controls the motor 20, i.e., the filter 10, to rotate at least two rotation speeds, i.e., a first rotation speed and a second rotation speed higher than the first rotation speed. The first rotation speed is a relatively low rotation speed at which a sound such as wind noise is hardly generated, and is, for example, about 500 rpm. Furthermore, the first rotational speed may be slower than the second rotational speed, i.e. also comprise zero. The second rotation speed is a relatively high speed rotation speed at which a sound such as wind noise is relatively large, and is, for example, about 1500 rpm. Since the air flow of the swirling flow is increased as the filter 10 rotates at a higher speed and the oil collection efficiency is increased, the filter preferably rotates at a relatively high speed when the concentration of oil particles in the soot is high. Therefore, the control unit 30 controls the rotation speed of the motor 20 at the relatively low first rotation speed and the relatively high second rotation speed according to the cooking state monitored by the cooking state monitoring unit 40. In this way, by controlling the rotation speed of the motor 20 for rotating the filter 10 according to the cooking state, the range hood 1 can be provided in which the filter 10 is rotated at a high speed only when necessary, and the chance of noise generation is reduced.

More specifically, the determination unit 50 determines whether or not soot exceeding a predetermined threshold is generated based on the cooking state monitored by the cooking state monitoring unit 40, and the control unit 30 rotates the motor 20 at the second rotation speed which is relatively high when the determination unit 50 determines that soot exceeding the predetermined threshold is generated. In this way, by rotating the filter 10 at a high speed only when smoke or soot having a predetermined threshold value or more is generated, the chance of generating loud noise can be reduced.

A control method of the control unit 30 will be described with reference to fig. 5. In addition, S of the flowchart means a step. In S100, the control unit 30 starts the operation of the hood 1 by, for example, the user operating the operation unit 70. That is, the control unit 30 rotates the fan 4 to generate an air flow, rotates the filter 10 at a first rotation speed at a relatively low speed and a low noise level, and starts monitoring of the state of the soot by the smoke sensor of the cooking state monitoring unit 40.

In S102, the cooking state monitoring unit 40 detects the amount of smoke generated (the mass concentration of oil particles contained in the smoke), and transmits the detected amount to the control unit 30. In S104, the control unit 30 checks whether or not the amount of smoke generated detected by the cooking state monitoring unit 40 is equal to or greater than a predetermined threshold value determined in advance. When the amount of smoke generated is equal to or greater than the predetermined threshold value, in S106, the control unit 30 rotates the filter 10 at the second rotation speed, which is relatively high. If the amount of soot generated is less than the predetermined threshold value, the step S106 is skipped and the low noise level is maintained.

In S108, the control unit 30 checks whether or not a signal for ending the operation is received from the operation unit 70 or the like. When the signal is not received, the operation is continued by repeating S104 to S108. When receiving the signal, the operation of the hood 1 is ended in S110. That is, the control unit 30 ends the rotation of the fan 4 and ends the rotation of the filter 10, and stops the monitoring of the state of the soot by the smoke sensor of the cooking state monitoring unit 40. In this way, by rotating the filter at high speed, which generates loud noise, only when smoke or soot above a predetermined threshold is generated, the chance of generating loud noise can be reduced. Alternatively, the holding operation may be performed in Japanese color after receiving a signal for ending the operation from the operation unit 70 or the like. The leaving operation may be performed by rotating the filter 10 until a predetermined time elapses, or may be performed based on the monitoring result of the cooking state monitoring unit 40.

A modification (first modification) of the control method will be described with reference to fig. 6. In order to avoid redundant description, the same steps as those in the above embodiment are omitted, and the description will be focused on the differences. S200 to S210 are the same as S100 to S110. In S204, the control unit 30 checks whether or not the amount of smoke generated detected by the cooking state monitoring unit 40 is equal to or greater than a predetermined threshold value determined in advance. When the amount of smoke generated is equal to or greater than the predetermined threshold value, the controller 30 rotates the filter 10 at the second rotation speed, which is relatively high speed, in S206. When the amount of soot generated is less than the predetermined threshold value, the control unit 30 stops the rotation of the filter 10 when the rotation speed of the filter 10 is zero in S212. As described above, in S200, the control unit 30 temporarily rotates the filter 10 at the relatively low first rotation speed, but may stop the rotation of the filter 10 without generating noise when the amount of soot generated is less than the threshold value.

A modification (second modification) of the control method will be described with reference to fig. 7. In order to avoid redundant description, the same steps as those in the above embodiment are omitted, and the description will be focused on the differences. S300 to S310 are the same as S100 to S110. In S304, the control unit 30 checks whether or not the amount of smoke generated detected by the cooking state monitoring unit 40 is equal to or greater than a predetermined threshold value determined in advance. When the amount of soot generated is equal to or greater than the predetermined threshold value, the controller 30 rotates the filter 10 at the second rotation speed, which is relatively high speed, in S306. When the amount of generated soot is less than the predetermined threshold value, in S312, the control unit 30 rotates the rotation speed of the filter 10 at the first rotation speed which is relatively low. Accordingly, even if the amount of generated soot temporarily exceeds the threshold value and the rotation of the filter 10 is controlled at the relatively high second rotation speed, the filter can be returned to the relatively low first rotation speed when the amount of generated soot becomes smaller than the predetermined threshold value, and thus the chance of generating loud noise can be reduced.

A modification (third modification) of the control method will be described with reference to fig. 8. In order to avoid redundant description, the same steps as those in the above embodiment are omitted, and the description will be focused on the differences. S400 to S410 are the same as S100 to S110. In S404, the control unit 30 checks whether or not the amount of smoke generated detected by the cooking state monitoring unit 40 is equal to or greater than a predetermined threshold value determined in advance. When the amount of smoke generated is equal to or greater than the predetermined threshold value, the controller 30 rotates the filter 10 at the second rotation speed, which is relatively high speed, in S406. When the amount of smoke generation is less than the predetermined threshold value, the control unit 30 maintains the previous rotation speed for a predetermined time period in S412. That is, even when the amount of generated soot temporarily exceeds the threshold value, the rotation of the filter 10 is controlled at the relatively high second rotation speed, and thereafter the amount of generated soot becomes smaller than the predetermined threshold value and returns to the relatively low first rotation speed, the relatively high second rotation speed is temporarily maintained. Thereafter, in S414, the control unit 30 rotates the rotation speed of the filter 10 at the first rotation speed that is relatively low. By maintaining the high second rotation speed for a short period of time in this way, it is possible to sufficiently collect soot and the like.

As described above, when the determination unit 50 determines that smoke or oil having a predetermined threshold value or more is generated and then determines that smoke or oil having a predetermined threshold value or more is not generated, the control unit 30 may stop the rotation of the motor 20 immediately, or stop the rotation of the motor 20 immediately after the rotation of the motor 20 is rotated at the first rotation speed at a low noise level, or stop the rotation of the motor 20 after the second rotation speed at which the collection efficiency is maintained for a predetermined time is maintained, or rotate the rotation of the motor 20 at the first rotation speed after the second rotation speed is maintained for a predetermined time. Accordingly, when the smoke is not generated at or above the predetermined threshold, the filter 10 is controlled to be at a low speed or stopped, and the possibility of noise generation can be reduced.

In addition, in the present embodiment, the description has been given of the case where the determination unit 50 determines that the smoke equal to or larger than the predetermined threshold value is generated and then determines that the smoke equal to or larger than the predetermined threshold value is not generated, but the present invention is not limited to this, and the subsequent control may be performed with reference to a threshold value different from the predetermined threshold value after the determination unit 50 determines that the smoke equal to or larger than the predetermined threshold value is generated. That is, when the determination unit 50 determines that smoke or oil having a predetermined threshold value or more is generated and then determines that smoke or oil having a threshold value different from the predetermined threshold value or more is not generated, the control unit 30 may stop the rotation of the motor 20 immediately, or stop the rotation of the motor 20 immediately after the rotation of the motor 20 is rotated at the first rotation speed at a low noise level, or stop the rotation of the motor 20 after the second rotation speed at which the collection efficiency is maintained for a predetermined time is maintained, or rotate the rotation of the motor 20 at the first rotation speed after the second rotation speed is maintained for a predetermined time.

The airflow rate of the air flow generated by the fan 4 may be at least two airflow rates, i.e., a first airflow rate and a second airflow rate larger than the first airflow rate, the second rotational speed when the fan 4 generates the second airflow rate may be higher than the second rotational speed when the fan 4 generates the first airflow rate, and the first rotational speed when the fan 4 generates the second airflow rate may be higher than the first rotational speed when the fan 4 generates the first airflow rate. Accordingly, since the noise generated by the filter 10 is buried when the fan 4 generating the air flow is rotated at a high speed, the rotation speed of the filter 10 is set to a high speed in this case and is hardly considered as the noise, and therefore, by controlling the rotation speed of the filter 10 in accordance with the high-speed rotation and the low-speed rotation of the fan 4, the chance of noise generation can be reduced and the high oil trapping efficiency can be maintained. Further, the flow velocity of the soot passing through the filter varies depending on the air volume, and therefore the required rotation speed of the filter 10 varies. Therefore, the first and second rotational speeds can be slowed when the relative air flow rate is small, and noise generated along with the rotation of the filter 10 can be reduced while maintaining high oil trapping efficiency.

< second embodiment >

The hood 1A according to the present embodiment will be described with reference to fig. 9. Note that, in order to avoid redundant description, the same reference numerals are used to omit the description of the same components as those of the above-described embodiment, and the description will be mainly focused on the differences. The range hood 1A includes: a fan 4 that generates an air flow; a filter 10 which is located upstream of the fan in the flow path of the air flow and has holes for passing the air flow; a motor 20 for rotating the filter 10; a control unit 30 that controls rotation of the motor 20 so that the motor 20 rotates at least two rotation speeds, namely, a first rotation speed and a second rotation speed that is faster than the first rotation speed; and a cooking state monitoring unit 40A for monitoring a cooking state in the cooker CD.

The cooking state monitoring unit 40A is a pan bottom temperature sensor that detects the temperature of the pan bottom provided in the cooker CD. The pan bottom temperature sensor may be a known sensor used for a cooking device, and includes a communication unit that transmits the temperature to the hood 1A, and the hood 1A includes a communication unit (not shown) that receives the pan bottom temperature from the communication unit and transmits the pan bottom temperature to the control unit 30. For example, when cooking is performed using oil in consideration of the temperature of the bottom of the pot greatly exceeding 100 ℃, the cooking state monitoring unit 40A transmits information on such temperature to the control unit 30. When receiving such information, the control unit 30 may rotate the filter 10 at the second rotation speed, which is relatively high. In this way, only when the bottom of the cooker CD is cooked at a temperature higher than a predetermined temperature, the filter 10 that generates loud noise is rotated at a high speed, and the chance of generating loud noise can be reduced.

< third embodiment >

The hood 1B according to the present embodiment will be described with reference to fig. 10. Note that, in order to avoid redundant description, the same reference numerals are used to omit the description of the same components as those of the above-described embodiment, and the description will be mainly focused on the differences. The range hood 1B includes: a fan 4 that generates an air flow; a filter 10 which is located upstream of the fan in the flow path of the air flow and has holes for passing the air flow; a motor 20 for rotating the filter 10; a control unit 30 that controls rotation of the motor 20 so that the motor 20 rotates at least two rotation speeds, namely, a first rotation speed and a second rotation speed that is faster than the first rotation speed; and a cooking state monitoring unit 40B for monitoring a cooking state in the cooker CD.

In the present embodiment, the cooking state monitoring unit 40B is a temperature sensor that is provided at an end portion of the inner surface panel 5 and detects the temperature of the pot or the like on the cooker CD and the temperature of the contents thereof. The temperature sensor is not particularly limited as long as it is a temperature sensor for measuring temperature in a non-contact manner, such as an infrared camera. In the present embodiment, the cooking state monitoring unit 40B is used in combination with the cooking state monitoring unit 40 of the smoke sensor and the cooking state monitoring unit 40A of the pan bottom temperature sensor, and the control unit 30 can comprehensively determine these sensors and control the rotation speed of the filter 10. The cooking state monitoring unit 40B may be used alone. In this way, when the temperature of the pot of the cooker CD and the contents thereof exceeds a predetermined temperature and cooking is performed, the filter 10 that generates loud noise is rotated at high speed, and the chance of generating loud noise can be reduced.

In the case of a cooker having a plurality of heat sources, when cooking is performed using a plurality of heat sources, the filter 10 may be rotated at the second rotation speed when one of the heat sources exceeds a predetermined temperature. In the case of a cooking device including a grill, the strainer 10 may be rotated at the second rotation speed when the grill is used. The grill may be used by detecting the temperature near the grill exhaust port by a temperature sensor provided in the range hood, or by receiving a cooker signal relating to cooking menu information selected by the cooker, an operation of igniting the grill, or the like by the range hood. When the temperature near the grill exhaust port is detected by a temperature sensor provided in the range hood, the grill may be determined to be used if the temperature near the grill exhaust port exceeds a predetermined value lower than the predetermined temperature. This is because the temperature near the exhaust port of the grill is lower than the temperature inside the grill that is actually heated.

< fourth embodiment >

The hood 1C according to the present embodiment will be described with reference to fig. 11. Note that, in order to avoid redundant description, the same reference numerals are used to omit the description of the same components as those of the above-described embodiment, and the description will be mainly focused on the differences. The range hood 1C includes: a fan 4 that generates an air flow; a filter 10 which is located upstream of the fan in the flow path of the air flow and has holes for passing the air flow; a motor 20 for rotating the filter 10; a control unit 30 that controls rotation of the motor 20 so that the motor 20 rotates at least two rotation speeds, namely, a first rotation speed and a second rotation speed that is faster than the first rotation speed; and a cooking state monitoring unit 40C for monitoring the cooking state of the cooking device CD.

In the case of the present embodiment, the cooking state monitoring unit 40C is an acoustic sensor that is attached to a wall surface between the range hood 1C and the cooker CD and collects sounds of cooking performed in the cooker CD. Cooking state monitoring unit 40C is separate from range hood 1C and performs wireless communication with control unit 30 in order to collect the sound of cooking performed on cooking device CD more favorably. Preferably, the sound sensor has directivity with respect to a pot or the like on the cooker CD, collects the frequency and magnitude thereof, and analyzes which cooking is performed.

For example, the cooking state monitoring unit 40C recognizes a sound of frying food or stir-frying food with oil, a sound of boiling food, or a sound of boiling water, and transmits information of such temperature to the control unit 30 in the case of the former sound. When receiving such information, the control unit 30 may rotate the filter 10 at the second rotation speed, which is relatively high. In this way, by rotating the filter 10 generating loud noise at high speed in accordance with the state and attribute of the sound generated by the cooker CD, the chance of loud noise generation can be reduced. The cooking state monitoring unit 40C is separate from the range hood 1C and can be disposed at a position suitable for the monitoring target.

In the present embodiment, the cooking state monitoring unit 40C is used in combination with the cooking state monitoring unit 40A of the pot bottom temperature sensor described above, and the control unit 30 can control the rotation speed of the filter 10 by comprehensively determining these sensors. For example, when the sound sensor of the cooking state monitoring unit 40C detects that the sound of the fried food is generated and the pan bottom temperature sensor of the cooking state monitoring unit 40 detects that the temperature is 100 ℃. The cooking state monitoring unit 40C may be used alone.

The present invention is not limited to the illustrated embodiments, and can be implemented by a configuration without departing from the scope of the contents described in the claims. That is, the present invention is particularly illustrated and described mainly with respect to specific embodiments, but those skilled in the art can apply various modifications to the above-described embodiments in terms of number, application examples, and other detailed configurations without departing from the scope of the technical spirit and the object of the present invention.

For example, the cooking state monitoring unit may monitor the cooking state based on information on any one of or a combination of a temperature sensor that detects the temperature of a substance placed on the cooker CD, a color sensor that detects the color of a substance placed on the cooker CD, an audio sensor that detects the sound generated by a substance placed on the cooker CD, a particle sensor that detects particles present in a space between the cooker CD and the range hood, cooking menu information selected by the cooker, and a cooker operation state sensor that detects the operation state of the cooker.

The present invention is not limited to the range hood, and may be a device for collecting soot generated from a cooking object in order to use a cooking device, and may be a lighting device with an air cleaner, for example.

Claims

1. A range hood provided above or near a cooking device, comprising:

a fan generating an air flow;

a filter which is present on the upstream side of the fan in the flow path of the air flow and has a hole through which the air flow passes;

a motor that rotates the filter;

a control unit that controls rotation of the motor so that the motor rotates at a first rotation speed and a second rotation speed that is faster than the first rotation speed, the first rotation speed being at least two rotation speeds; and

a cooking state monitoring part for monitoring the cooking state in the cooker,

the control unit controls the rotation speed of the motor at the first rotation speed and the second rotation speed according to the cooking state monitored by the cooking state monitoring unit,

the air flow generated by the fan has at least two air flows, namely a first air flow and a second air flow larger than the first air flow,

the second rotational speed at which the fan generates the second air volume of air flow is faster than the second rotational speed at which the fan generates the first air volume of air flow,

the first rotational speed at which the fan generates the second air volume of air flow is faster than the first rotational speed at which the fan generates the first air volume of air flow.

2. The range hood of claim 1,

further comprises a determination unit for determining whether or not smoke equal to or greater than a predetermined threshold value is generated based on the cooking state monitored by the cooking state monitoring unit,

the control unit rotates the motor at the second rotation speed when the determination unit determines that the soot is generated at or above a predetermined threshold value.

3. The range hood of claim 2,

when the determination unit determines that the predetermined threshold value or more is not generated after the determination unit determines that the soot is generated, or the predetermined threshold value or more is not generated, the control unit immediately stops the rotation of the motor, or immediately rotates the rotation of the motor at the first rotation speed, or stops the rotation of the motor after maintaining the second rotation speed for a predetermined time, or rotates the rotation of the motor at the first rotation speed after maintaining the second rotation speed for a predetermined time.

4. The range hood of any one of claims 1 to 3,

the cooking state monitoring unit is separate from the range hood and performs wireless communication with the control unit.