CN112377963B

CN112377963B - Fume exhaust fan

Info

Publication number: CN112377963B
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: 2023-07-14
Anticipated expiration: 2037-12-25
Also published as: TWI762360B; TWI734884B; JP2018105568A; MY193141A; TW202142812A; CN112377963A; WO2018123512A1; MY191082A; CN108240673A; JP6382929B2; TW201825836A

Abstract

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

Description

Fume exhaust fan

The present application is a divisional application of application number 201711419483.9, entitled "range hood", having application date 2017, 12, 25.

Technical Field

The present invention relates to a range hood, and more particularly, to a range hood in which a filter is rotated.

Background

Conventionally, a range hood has been proposed in which a filter is rotated during an exhaust operation. For example, patent document 1 discloses a range hood with low pressure loss and high oil collection efficiency. The range hood comprises: a fan generating an air flow; a filter which is located upstream of the fan in the air flow path and has a hole through which the air flow passes; a motor that rotates the filter; an oil-collecting member surrounding the periphery of 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 problems, there is provided a range hood which is provided above or near a cooker, comprising: a fan generating an air flow; a filter which is located upstream of the fan in the air flow path 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 rotational speed that is at least two rotational speeds and a second rotational speed that is faster than the first rotational 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 in accordance with the cooking state monitored by the cooking state monitoring unit.

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

In addition, the following structure may be characterized: the range hood further includes a determination unit that determines whether or not oil smoke is generated at a predetermined threshold value or more 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 oil smoke is generated at the predetermined threshold value or more.

According to the above, when the oil smoke is generated at a predetermined threshold or more, the filter is rotated at a high speed, so that the chance of generating large noise can be reduced.

In addition, the following structure may be characterized: when the determination unit determines that the oil smoke is generated at the predetermined threshold or more, and then determines that the oil smoke is not generated at the predetermined threshold or more, the control unit immediately stops the rotation of the motor, immediately rotates the motor at the first rotation speed, maintains the second rotation speed for a predetermined time, and then stops the rotation of the motor, maintains the second rotation speed for a predetermined time, and then rotates the motor at the first rotation speed.

According to the above, when the soot is not generated more than the predetermined threshold, the filter is controlled to be low or stopped, so that the chance of noise generation can be reduced.

In addition, the following structure may be characterized: the air flow rate of the air flow generated by the fan is at least two air rates, namely a first air rate and a second air rate larger than the first air rate, and the second rotation speed of the air flow generated by the fan is faster than the second rotation speed of the air flow generated by the fan when the air flow generated by the first air rate is generated by the fan, and the first rotation speed of the air flow generated by the fan when the air flow generated by the second air rate is faster than the first rotation speed of the air flow generated by the fan when the air flow generated by the first air rate is generated by the fan.

According to the above, since noise is generated by the filter when the fan generating the air flow rotates at a high speed, it is difficult to consider the rotation speed of the filter as noise even if the filter rotates at 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, the chance of noise generation can be reduced and the high oil trapping efficiency can be maintained. In addition, the flow rate of the oil smoke passing through the filter varies depending on the air volume, and thus the rotation speed of the filter is required to be different. Therefore, the first rotation speed and the second rotation speed can be reduced when the relative air volume is small, and noise generated by the rotation of the filter can be reduced while maintaining high oil trapping efficiency.

In addition, the following structure may be characterized: the cooking state monitoring unit is separated from the range hood, and performs wireless communication with the control unit.

According to the above, the cooking state monitoring unit and the range hood are separated from each other, and can be disposed at a position suitable for the object to be monitored.

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

Drawings

Fig. 1 is a view of a range hood according to a first embodiment of the present invention when the range hood is 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 the range hood according to the first embodiment of the present invention, fig. 2 (a) is a bottom view, and fig. 2 (B) is a bottom view with the rectifying plate removed.

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

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

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

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

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

Fig. 8 is a flowchart showing a control method of the range hood according to the 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 when the range hood is 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 when the range hood is 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 when the range hood is installed in a kitchen, where fig. 11 (a) is a front view and fig. 11 (B) is a side view.

Reference numerals illustrate:

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

Detailed Description

Hereinafter, embodiments 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 range hood 1 is provided in a kitchen in which a cooker CD is provided, and as shown in fig. 1, is disposed above the cooker CD to trap oil smoke, hot air, and the like generated by cooking with the cooker CD, and discharges the cleaned air to the outside or the like. The range Hood 1 has a thin Hood (Hood) 2 for trapping soot and the like generated by cooking performed downward, and the Hood 2 has an inner surface panel 5 recessed upward on an inner surface. The range hood 1 of the present embodiment is disposed above the cooker CD, but may be disposed in the vicinity of the side of the cooker CD.

As shown in fig. 2 to 4, the hood 2 is connected to a blower box 3 connected to an exhaust duct (not shown) near a communication port 6 of an inner panel 5 located at the upper rear. The blower box 3 is located on the back side of the curtain plate 9, and has a fan 4 which is a sirocco fan (sirocco fan) inside and generates an air flow D1. Therefore, when the fan 4 is operated, the communication port 6 is set to 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 upstream of the fan 4 in the flow path of the air flow D1 generated by the fan 4.

The range hood 1 includes: a disc-shaped filter 10 having a hole 11 for passing the air flow D1 at the position of the communication port 6; a motor 20 connected to the center of the disk-shaped filter 10 to rotate the filter 10; and an oil collecting member 60 attached to the inner surface panel 5 and disposed so as to surround the outer periphery of the filter 10. Accordingly, the range hood 1 includes a rotatable filter 10, and the filter 10 is located on the upstream side of the air flow D1 generated by the fan 4 in the flow path of the air flow D1, and has a hole 11 through which the air flow passes from the bottom to the top in 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 for receiving a user operation and outputting an operation/stop signal of the range hood 1 to the control unit 30. The control unit 30 is constituted by a well-known microcomputer including a control program or 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 constituted by a switch operated by a user of the range hood 1, and is disposed on the front side surface of the hood 2. Of course, but not limited thereto, it may be configured as follows: the cooking device receives and outputs signals from a remote control and a cooking device which are separate from the range hood 1. The operation unit 70 outputs not only the operation signal and the stop signal of the range hood 1 but also a signal indicating a change in the rotational speeds of the fan 4 and the motor 20 to the control unit 30.

The air below the inner surface panel 5 includes hot air, oil smoke, and the like generated by cooking, and when the fan 4 is operated, the air is sucked 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. When receiving an operation signal from the operation unit 70, the control unit 30 rotates the fan 4 to generate the air flow D1, and rotates the filter 10 rotatably provided by the motor 20 by energizing the motor 20. The range hood 1 traps the oil contained in the air in the oil trapping member 60 by rotating the filter 10.

The method of trapping the oil will be described in detail. The heated air rises toward the hood 1 together with hot air, oil smoke, 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. Thus, the air that has risen to the vicinity of the rectifying plate 7 is sucked from between the rectifying plate 7 and the inner surface plate 5, and then is sucked into 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 controls the following manner: in the operating state, when the fan 4 that generates an air flow is rotated in order to trap oil smoke or the like generated by cooking in the range hood 1, the motor 20 that rotates the filter 10 is rotated. The rotational speed per unit time of the filter 10 also 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 rotates at such a high rotational speed, the surface of the filter 10 (the portion where the holes 11 are not provided) drags air in contact with the surface due to friction force, and this movement is transmitted to the nearby air due to 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 rotational movement, so that the movement of the air becomes a vortex shape centering on the axis of the motor 20.

This swirling motion of air is generated on both surfaces of the filter 10, that is, on both the lower surface and the upper surface of the filter 10, that is, on 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 thus on the downstream side of the filter 10, the movement of the swirling 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, which is attracted by the fan 4. On the other hand, on the upstream side of the filter 10, the swirling air movement forms a high-density air layer that is pressed against the surface of the filter 10 and accompanies a swirling flow toward the outer periphery of the filter 10.

The oil produced by cooking or the like flows together with the air flow to reach the vicinity of the surface on the upstream side of the filter 10. The oil reaching the vicinity of the upstream surface is flicked in the outer peripheral direction of the filter 10 by a swirling flow of the high-density air layer toward the outer peripheral edge, and the other part (oil having a relatively large particle diameter) collides with the upstream surface (portion where the hole 11 is not provided) of the filter 10, whereby the other part is flicked in the outer peripheral direction of the filter 10. As a result, the oil is collected and recovered by the oil collecting member 60 provided so as to surround the outer periphery of the disc-shaped filter 10. Therefore, in the range hood 1 of the present embodiment, oil hardly adheres to the downstream portion of the filter 10 in the air flow path, and the trouble of cleaning/washing the fan 4, the exhaust duct, and the like in the downstream portion of the filter 10 can be significantly reduced.

On the other hand, the filter 10 rotates, in particular, at a high speed, so that the air near the surface of the filter 610 also moves faster, and sounds such as wind noise are generated. The range 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 for monitoring a cooking state of the cooker CD, and a determining unit 50 for determining whether or not a predetermined threshold or more of oil smoke 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 section 40 is a smoke sensor provided at an end portion of the inner surface panel 5 and detecting 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 detect the mass concentration of oil particles contained in the oil smoke rising from the cooker CD by, for example, irradiating light in the direction of the cooker CD and measuring the amount of scattered light of the light.

The determination unit 50 determines whether or not smoke is generated above a predetermined threshold 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, for example, obtaining in advance the mass concentration of oil particles contained in the oil smoke at the time of cooking with the oil pan, frying food, or the like.

The control unit 30 controls the motor 20, i.e., the filter 10, to rotate at various rotational speeds, and controls the motor 20, i.e., the filter 10, to rotate at least two rotational speeds, i.e., a first rotational speed and a second rotational speed that is faster than the first rotational speed. The first rotation speed is a relatively low rotation speed at which sounds such as wind noise are hardly generated, for example, about 500 rpm. The first rotation speed may be lower than the second rotation speed, that is, zero is included. The second rotational speed is a relatively high rotational speed having a relatively large sound such as wind noise, and is, for example, about 1500 rpm. The higher the filter 10 rotates at a higher speed, the more the airflow of the swirl flow increases, and the higher the oil collection efficiency becomes, so that when the concentration of oil particles in the oil smoke becomes high, the rotation at a relatively higher speed is preferable. Accordingly, the control unit 30 controls the rotation speed of the motor 20 at the first rotation speed of the relatively low speed and the second rotation speed of the relatively high speed according to the cooking state monitored by the cooking state monitoring unit 40. In this way, the range hood 1 can be provided in which the rotation speed of the motor 20 for rotating the filter 10 is controlled according to the cooking state, so that 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 the oil smoke is generated at the predetermined threshold value or more 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 relatively high rotational speed when the determination unit 50 determines that the oil smoke is generated at the predetermined threshold value or more. In this way, by rotating the filter 10 at a high speed only when soot greater than or equal to a predetermined threshold is generated, the chance of generating large noise can be reduced.

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

In S102, the cooking state monitoring unit 40 detects the amount of oil smoke generated (the mass concentration of oil particles contained in the oil smoke), and transmits the detected oil smoke to the control unit 30. In S104, the control unit 30 checks whether or not the amount of oil smoke generated detected by the cooking state monitoring unit 40 is equal to or greater than a predetermined threshold value. When the amount of soot generated is equal to or greater than the predetermined threshold, the control unit 30 rotates the filter 10 at the second relatively high rotation speed in S106. When the amount of oil smoke generated is less than the predetermined threshold, 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 this signal is not received, S104 to S108 are repeated to continue the operation. When this signal is received, in S110, the operation of the range hood 1 is ended. That is, the control unit 30 ends the rotation of the fan 4, ends the rotation of the filter 10, and stops the monitoring of the state of the smoke by the smoke sensor of the cooking state monitoring unit 40. In this way, by performing high-speed rotation of the filter that generates large noise only when soot is generated above a predetermined threshold, the chance of generating large noise can be reduced. After receiving a signal for ending the operation from the operation unit 70 or the like, the remaining operation (Japanese: residual device) may be performed. The holding operation may be performed by rotating the filter 10 until a constant 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 repetition of description, description of the same steps as those of the above embodiment will be omitted, and description will be focused on differences. S200 to S210 are the same as S100 to S110. In S204, the control unit 30 checks whether or not the amount of oil smoke generated detected by the cooking state monitoring unit 40 is equal to or greater than a predetermined threshold value. When the amount of soot generated is equal to or greater than the predetermined threshold, the control unit 30 rotates the filter 10 at the second relatively high rotation speed in S206. When the amount of soot generated is less than the predetermined threshold, the control unit 30 sets the rotation speed of the filter 10 to zero, that is, stops the rotation of the filter 10 in S212. In this way, in S200, the control unit 30 temporarily rotates the filter 10 at the first rotation speed that is relatively low, but when the amount of oil smoke generated is smaller than the threshold value, the rotation of the filter 10 may be stopped without generating noise.

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

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

In this way, when the determination unit 50 determines that the oil smoke is generated at the predetermined threshold or more and then determines that the oil smoke is not generated at the predetermined threshold or more, the control unit 30 may stop the rotation of the motor 20 immediately, stop the rotation of the motor 20 immediately after the rotation of the motor 20 is rotated at the first rotation speed of the low noise level, or maintain the second rotation speed of the high predetermined time collection efficiency, or maintain the second rotation speed for the predetermined time and then rotate the motor 20 at the first rotation speed. Accordingly, when the soot is not generated more than the predetermined threshold, the filter 10 is controlled to be low or stopped, and the occurrence of noise can be reduced.

In the present embodiment, the case where the determination unit 50 determines that the oil smoke is generated at the predetermined threshold or more and then determines that the oil smoke is not generated at the predetermined threshold or more has been described, but the present invention is not limited to this, and the subsequent control may be performed based on a threshold value different from the predetermined threshold value after the determination unit 50 determines that the oil smoke is generated at the predetermined threshold or more. That is, when the determination unit 50 determines that the oil smoke is generated at the predetermined threshold or more and then determines that the oil smoke is not generated at the threshold or more different from the predetermined threshold or more, the control unit 30 may immediately stop the rotation of the motor 20, immediately rotate the motor 20 at the first rotation speed of the low noise level, stop the rotation of the motor 20 after maintaining the second rotation speed of the high predetermined time collection efficiency, or maintain the second rotation speed for the predetermined time and then rotate the motor 20 at the first rotation speed.

In addition, at least two kinds of air volumes of the air flow generated by the fan 4, that is, a first air volume and a second air volume larger than the first air volume, may be used, and the second rotational speed when the fan 4 generates the air flow of the second air volume may be faster than the second rotational speed when the fan 4 generates the air flow of the first air volume, and the first rotational speed when the fan 4 generates the air flow of the second air volume may be faster than the first rotational speed when the fan 4 generates the air flow of the first air volume. Accordingly, when the fan 4 generating the air flow rotates at a high speed, noise generated by the filter 10 is submerged, and therefore, in this case, it is difficult to consider the rotation speed of the filter 10 as noise, and therefore, by controlling the rotation speed of the filter 10 in correspondence with the high-speed rotation and the low-speed rotation of the fan 4, it is possible to reduce the chance of noise generation and maintain high oil trapping efficiency. In addition, the flow rate of the oil smoke passing through the filter varies depending on the air volume, and thus the rotation speed of the filter 10 is required to vary. Therefore, the first rotation speed and the second rotation speed can be reduced when the relative air volume is small, and noise generated by the rotation of the filter 10 can be reduced while maintaining high oil trapping efficiency.

< second embodiment >

A range hood 1A according to the present embodiment will be described with reference to fig. 9. In order to avoid repetition of description, description of the same constituent elements as those of the above embodiment will be omitted by designating the same reference numerals, and description will be made mainly on the differences. The range hood 1A includes: a fan 4 for generating an air flow; a filter 10 which is located upstream of the fan in the air flow path and has a hole 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 rotational speeds, i.e., a first rotational speed and a second rotational speed that is faster than the first rotational speed; and a cooking state monitoring part 40A that monitors a cooking state in the cooker CD.

The cooking state monitoring unit 40A is a bottom temperature sensor that detects the temperature of the bottom of the cooker CD. The bottom temperature sensor may be a known sensor for a cooker, and may include a communication unit that transmits the temperature to the range hood 1A, and the range hood 1A may include a communication unit (not shown) that receives the bottom temperature from the communication unit and transmits the bottom temperature to the control unit 30. For example, when cooking is performed using oil while the temperature of the bottom of the pan is considerably higher than 100 ℃, the cooking state monitoring unit 40A transmits information of such temperature to the control unit 30. When such information is received, the control unit 30 may rotate the filter 10 at a relatively high second rotation speed. In this way, only when the bottom of the cooker CD exceeds a predetermined temperature and cooking is performed, the filter 10 generating large noise is rotated at a high speed, and thus the chance of generating large noise can be reduced.

< third embodiment >

A range hood 1B according to the present embodiment will be described with reference to fig. 10. In order to avoid repetition of description, description of the same constituent elements as those of the above embodiment will be omitted by designating the same reference numerals, and description will be made mainly on the differences. The range hood 1B includes: a fan 4 for generating an air flow; a filter 10 which is located upstream of the fan in the air flow path and has a hole 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 rotational speeds, i.e., a first rotational speed and a second rotational speed that is faster than the first rotational speed; and a cooking state monitoring part 40B that monitors a cooking state in the cooker CD.

In the case of the present embodiment, the cooking state monitoring section 40B is a temperature sensor provided at an end portion of the inner surface panel 5 and detecting the temperature of the pan or the like and its contents on the cooker CD. The temperature sensor is not particularly limited as long as it is a temperature sensor that measures temperature without contact, 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 control the rotation speed of the filter 10 by comprehensively determining these sensors. The cooking state monitoring unit 40B may be used alone. In this way, when cooking is performed by the temperature of the pan, etc. of the cooker CD and the contents thereof exceeding a predetermined temperature, the filter 10 generating large noise is rotated at a high speed, so that the chance of generating large noise can be reduced.

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

< fourth embodiment >, a third embodiment

A range hood 1C according to the present embodiment will be described with reference to fig. 11. In order to avoid repetition of description, description of the same constituent elements as those of the above embodiment will be omitted by designating the same reference numerals, and description will be made mainly on the differences. The range hood 1C includes: a fan 4 for generating an air flow; a filter 10 which is located upstream of the fan in the air flow path and has a hole 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 rotational speeds, i.e., a first rotational speed and a second rotational speed that is faster than the first rotational speed; and a cooking state monitoring part 40C that monitors a cooking state in the cooker CD.

In the case of the present embodiment, the cooking state monitoring unit 40C is a sound sensor that is attached to a wall surface between the range hood 1C and the cooker CD, and collects sounds of cooking performed on the cooker CD. The cooking state monitoring unit 40C is separate from the range hood 1C to collect the cooking sound generated by the cooking device CD, and performs wireless communication with the control unit 30. Preferably, the sound sensor has directivity with respect to a pot or the like on the cooker CD, and collects the frequency and the size thereof, and analyzes what cooking is performed.

For example, the cooking state monitoring unit 40C recognizes sounds of frying food or frying dish, cooking food, and boiling water, and if the sounds are the former sounds, it transmits information of such temperature to the control unit 30. When such information is received, the control unit 30 may rotate the filter 10 at a relatively high second rotation speed. In this way, by performing high-speed rotation of the filter 10 that generates large noise according to the state and attribute of the sound generated on the cooker CD, the chance of generating large noise 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 object to be monitored.

In the present embodiment, the cooking state monitoring unit 40C is used in combination with the cooking state monitoring unit 40A of the above-described pan bottom temperature sensor, and the control unit 30 can control the rotation speed of the filter 10 by comprehensively determining these sensors. For example, the control unit 30 may control the filter 10 at the first rotation speed of a relatively low speed and a low noise level 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 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 that does not depart from the scope of the contents described in the claims. That is, the present invention has been particularly shown and described with respect to specific embodiments, but those skilled in the art can apply various modifications to the above-described embodiments, in number, in application, and in other detailed configurations without departing from the scope of the technical spirit and the purpose of the present invention.

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

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

Claims

1. A range hood is provided above or near a cooker, and comprises:

a fan generating an air flow;

a filter which is located upstream of the fan in a 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 rotational speed that is at least two rotational speeds and a second rotational speed that is faster than the first rotational speed; and

a cooking state monitoring section that monitors a cooking state in the cooker,

the control part 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 part,

the air flow rate of the air flow generated by the fan has at least two air rates, namely a first air rate and a second air rate which is larger than the first air rate,

the second rotational speed of the fan when generating the second amount of air flow is faster than the second rotational speed of the fan when generating the first amount of air flow,

the first rotational speed of the fan when generating the air flow of the second air volume is faster than the first rotational speed of the fan when generating the air flow of the first air volume.

2. A range hood according to claim 1, characterized in that,

further comprising a determination unit that determines whether or not oil smoke having a predetermined threshold value or more has been 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 oil smoke is generated at a predetermined threshold or more.

3. A range hood according to claim 2, characterized in that,

when the determination unit determines that the oil smoke is generated at a predetermined threshold or more and then determines that the oil smoke is not generated at the predetermined threshold or more, the control unit immediately stops the rotation of the motor, or immediately rotates 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 maintains the second rotation speed for a predetermined time, and then rotates the motor at the first rotation speed.

4. A range hood according to any one of claims 1 to 3, characterized in that,

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