JPH09318125A - Range hood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a range hood suitable for energy-saving by a method wherein a lighting instrument is lighted when a person is before a cooking instrument to inspect the condition of cooking and the like but the lighting is put out when man is not present before the cooking instrument. SOLUTION: This range hood is constituted of a fan unit 4, received in the hood whose lower surface is opened, and a lighting instrument 9 for illuminating cooking instruments B, such as a gas range and the like which are arranged below the range hood. In this case, a human detecting sensor 11 for detecting the existence of a man standing before the cooking instruments is provided in the hood and when the human detecting sensor 11 has detected the existence of a man for a given period of time continuously, the lighting instrument 9 is lighted while the lighting instrument 9 is put out when the human detecting sensor 11 has not detected the existence of the man continuously for a given period of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a range hood having a built-in blower unit installed above a cooking utensil such as a gas stove or an electric range, and more particularly to a range hood equipped with a lighting device for illuminating the surface of the cooking utensil.

[0002]

2. Description of the Related Art A range hood installed above a cooking appliance such as a gas stove or an electric range to suck and discharge smoke, odor, and combustion exhaust gas generated by cooking is equipped with a lighting device for illuminating the surface of the cooking utensil. Therefore, when cooked or cooked with cooking utensils, the cooked food can be seen well.
Turning on / off of the lighting equipment is generally operated by turning on / off the lighting equipment separately from the start / stop operation of the blower, or an illuminance sensor for detecting the brightness of the cookware surface such as a gas table is used as a hood. No. 63-26663 is proposed in Japanese Patent Laid-Open No. 63-26663, in which a lighting device is turned on in response to the illuminance sensor.

[0003]

By the way, in the case of turning on / off the lighting equipment in the conventional range hood by operating the lighting / extinguishing switch as described above, the cooked food is viewed when the blower is driven or after the driving. It is common to operate the switch to turn on the light, and turn off the light when the cooking is finished and the blower is stopped. Therefore, even after the condition of the cooked product is inspected and the cookware is moved away from the front of the cookware, the lighting fixture remains lit, which is very uneconomical against energy saving.

Also in the latter case, if the brightness of the cooking utensil surface is darker than the prescribed brightness, the illumination device is turned on by the illuminance sensor. If the brightness is lower than the specified brightness, the luminaire remains on. Therefore, in the latter case, as in the former case, there is a problem that it is uneconomical against energy saving.

The present invention has been made in view of the above-mentioned problems of the prior art, and the purpose thereof is to:
A range hood that is energy-saving and lights up when there is a person in front of the cooking utensils to check the condition of the cooked food, and turns off when there is no person in front of the cooking utensils To provide.

[0006]

Means for Solving the Problems The technical means taken by the present invention to achieve the above-mentioned object is such that a blower unit is housed in a hood having an open lower surface, and a gas stove or the like arranged below is installed. In a range hood equipped with a lighting device that illuminates a cooking utensil, a human sensor for detecting the presence of a person standing in front of the cooking utensil is provided in the hood, and the human sensor continuously detects the presence of a person for a certain period of time. In this case, the lighting device is turned on, and the lighting device is turned off when the human sensor does not continuously detect the presence of a person for a certain period of time.

The operation and stop of the blower unit equipped in the range hood is not limited to the manual operation, but it is detected whether or not a cooking appliance such as a gas range or an electric range arranged below the range hood is used. It may be a range hood provided with an automatic operation mechanism in which the blower unit is automatically operated and automatically stopped. As a detection means for detecting the presence or absence of the use of cooking utensils, the temperature inside and outside the hood is detected,
A method to determine whether it is used or not depending on whether the temperature difference is larger or smaller than a preset value, a method to determine whether it can be used by a gas sensor, or a method to determine whether it can be used by a flame sensor, etc. Is mentioned.

The human sensor is attached to a range hood having an automatic driving mechanism, and the lighting signal of the lighting device is controlled by a detection signal of the human sensor. The lighting / lighting method is as follows. There is a method. (1) When the human sensor continuously detects the presence of a person for a certain period of time after the detection means for detecting the use of the cooking appliance detects the use of the cooking appliance and the blower unit starts the automatic operation. The luminaire is turned on, and when the human sensor does not detect the presence of a person continuously for a certain period of time, the luminaire is turned off. (2) The fan unit is forcibly turned on for a certain period of time after the automatic operation starts, and thereafter, when the human sensor continuously detects the presence of a person for a certain period of time, the lighting fixture is turned on and the presence of the person is detected for a certain period of time. If it is not continuously detected, the lighting device is turned off. (3) Regardless of whether the blower unit is running or stopped, it lights up when the presence of a person is continuously detected for a certain period of time by a human sensor, and after lighting up, the detection means detects the use of cooking utensils and the blower unit automatically operates. After that, when the motion sensor detects the presence of a person for a certain period of time, the lighting equipment is turned on.
If the presence of a person is not continuously detected for a certain period of time, the lighting device is turned off. (4) Provide a changeover switch to stop the function of the motion sensor,
When the switch is operated to stop the function of the motion sensor, the lighting device is turned on / off in synchronization with the operation / stop of the blower unit by the detection means.

Further, the human sensor provided on the range hood has a detection range within the width of the cooking utensil so that it does not detect a human being outside the range of the cooking utensil. Furthermore, an illuminance sensor that measures the illuminance of the surface of the cooking utensil is attached to the hood facing the direction of the cooking utensil, the blower unit is in automatic operation, and the human sensor is detecting the presence of a person, The illuminator may be turned on when the illuminance sensor measures that the illuminance on the cooking utensil surface is below a certain value.

According to the above-mentioned means, the lighting equipment installed in the range hood is turned on when the human presence sensor detects that a human is present in front of the cooking utensil for a certain period of time. Does not detect the presence of a person continuously for a certain period of time, the illuminating device that is turned on is turned off, so that the illuminating device is not turned on even though it is away from the cooking device. That is, as long as the motion sensor is functioning, if a certain period of time is set in front of the cooking utensil in order to check the food to be cooked by the cooking utensil,
During that time, the lighting equipment is turned on, and when inspection of the food is completed and the cooking equipment is separated, the lighting equipment is turned off.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a range hood installed in a kitchen or the like, where A is a range hood having a blower unit built therein, B is a cooking appliance such as a gas range or an electric range, and the range hood A is a cooking appliance. It is installed just above B. The range hood A includes a lower plate 2 and a filter 3 for accommodating a blower unit 4 inside a hood 1 which is configured by detachably attaching a front plate 1b to a front surface of a hood body 1a whose bottom and front surfaces are open. In the well-known form in which the section 5 is partitioned and formed, the exhaust duct 6 is connected to the outlet of the fan casing in the blower unit 4, and the curtain on the top plate of the hood 1 that shields from the ceiling. A plate 7 is provided so that the exhaust duct 6 is out of the sight of the user standing in front of the cookware B.

Blower unit 4 housed in hood 1
Is a well-known one including a fan casing, a fan and a motor, and a multi-blade fan is used as the fan. Further, an operation switch for operating the above-mentioned blower unit 4 is operated on the lower part of the front surface of the front plate 1b constituting the hood 1, and a lighting device (lamp) 9 attached to the lower part on the back side of the front plate 1b is turned on / off. A switch 8 such as an operation switch to operate is attached.

Use of the cooking utensil B on the front plate 1b of the hood 1 of the range hood A constructed as described above (ignition)
/ Detection means 10 for detecting non-use (extinguishing) and cooking utensil B
Human sensor 11 that detects whether a human is present in front of
Further, an illuminance sensor 12 for measuring the brightness of the upper surface of the cooking utensil B is attached. The detecting means 10 comprises an inner temperature detector 10a for detecting the temperature inside the hood 1 and an outer temperature detector 10b for detecting the temperature outside the hood 1. The detection range of the human detection sensor 11 is within the width of the cooking utensil B, and it is used to detect whether or not a human is present in front of the cooking utensil B. The human sensor 11 determines whether or not a human is present. "Continuous for a certain period of time (for example, 10 seconds)" is a condition, whereby the cooker or another person simply crosses in front of the cookware B, and the lighting fixture 9 turns on and off, which causes an obstacle. It has been prevented. The illuminance sensor 12 measures whether or not the brightness of the upper surface of the cooking utensil B is brighter than a preset brightness, and lights the lighting device 9 when the brightness is darker than a predetermined brightness.

The inner temperature detector 10a and the outer temperature detector 10b of the detecting means 10 are mounted at a substantially central position in the lateral width of the front plate 1b, and at a height (H) 1 from the lower end of the front plate 1b.
/ 2H or more, the lower side of the upper end of the front plate is preferable, and the front plate 1
Inside temperature detector 10a and outside temperature detector
10b are attached back to back facing their respective spaces.

FIG. 3 shows the blower unit 4 of the above-mentioned range hood A, switches 8 for manually operating the blower unit 4 and the luminaire 9, and an inside temperature detector 10a and an outside temperature detector constituting a detecting means 10. 10b, and a human sensor 11,
An electric circuit diagram of the illuminance sensor 12 is shown. In the figure, 13 is a detection unit for comparing whether the difference between the detected temperatures of the inner temperature detector 10a and the outer temperature detector 10b is larger or smaller than a predetermined set value. The determination result is output to the control unit 14, and the control unit 14 turns ON / OFF the drive circuit of the fan motor of the blower unit 4 and simultaneously turns ON / OFF the circuit of the lighting fixture 9.
The lighting device 9 is turned off, the lighting device 9 is turned on during the operation of the blower unit 4, and the lighting device 9 is turned off when the blower unit 4 is stopped. Also, the manual operation switch 8
A lamp and a buzzer for receiving the signal from the blower unit 4 to start / stop the blower unit 4, change the operating speed, turn on / off the lighting fixture 9, and indicate an abnormality in the inside / outside temperature detectors 10a, 10b
It is configured to control 15 mag. The signal from the manual operation switch 8 is not limited to be transmitted to the control unit 14 by wire, but may be transmitted wirelessly (electric wave, infrared ray, etc.). Furthermore, during automatic operation of the blower unit 4, the operating speed of the blower unit and the lighting fixture 9
When the on / off of is switched by the manual operation switch 8, the switching content is stored in the memory, and the start of the next automatic operation is executed with the stored content.

A method of detecting the use (ignition) and the detection of the stop (extinguishing) by the detection unit 13 will be briefly described below.
Now, the inside temperature detector 10a installed on the front plate 1b of the hood 1
The internal temperature measured by Ti, the external temperature measured by the external temperature detector 10b is To, and the external temperature To measured at regular intervals is a plurality of data within a fixed time (for example, measured at 1 minute intervals for 5 minutes). Ignition detection and extinguishing by comparing the reference temperature Tr consisting of the average value of 5 data), the first set value dT1 (eg 3 ° C) and the second set value dT2 (eg 1.5 ° C) Detect. First, in ignition detection, the difference between the internal temperature Ti and the reference temperature Tr (Ti-Tr)
Is larger than the first set value dT1 (= 3 ° C), it is determined that the cooking stove of cookware B has been ignited (used), and the control unit
The ignition detection signal is output to 14, and the control unit 14 energizes (ON) the operation circuit of the fan motor. The reference temperature Tr
Is constantly updated and recorded with its data. Further, the data of a plurality (five) of the outside temperatures To which are used as the basis for calculating the reference temperature Tr are | Ti-To | ≦ dT3 with respect to the preset third set value dT3 (for example, 1 ° C.). Only those satisfying the above condition are satisfied, thereby eliminating the influence of temperature disturbance due to cooling and heating. In the unlikely event that individual data is | Ti-
When To | ≦ dT3 is not satisfied and the data for calculating the average value becomes empty, the above-described comparison calculation is performed using the outside temperature To at that time (current time) as the reference temperature Tr. If the number of data (5 pieces) measured within a fixed time (5 minutes) that satisfies the above condition (| Ti-To | ≦ dT3) is smaller than the number of the measurement data, the above condition is set. The average value is calculated by the number of data to be satisfied.

In the fire extinguishing detection, the difference (Ti-To) between the internal temperature Ti and the internal temperature To is the second set value dT2 (for example, 1.5 ° C.).
If it is smaller and the state is continued for a fixed time (for example, 1 minute), it is determined that the cooking stove of the cooking utensil B has been extinguished (stopped use), and a fire extinguishing detection signal is output to the control unit 14, Reference numeral 14 stops (turns off) energization of the operation circuit of the fan motor. Incidentally, the above Ti-To ≤ second set value
The duration of the condition of dT2 (for example, 1.5 ° C.) is not limited to 1 minute and can be set arbitrarily.

FIG. 4 is an explanatory view showing a lighting / non-lighting mode of the lighting device 9 mounted on the range hood A described above. (A) When the function of the human sensor 11 is stopped by operating the changeover switch in the automatic operation type range hood provided with the detection means 10, the blower unit 4 is driven by the detection signal of the detection means 10.
The lighting fixture 9 is turned on at the same time when the automatic driving starts.
At the same time when the blower unit 4 is automatically stopped, the lighting device 9 is turned off. If the stop button of the manual operation switch is pressed during automatic operation, the blower unit is stopped, and similarly, if the extinguishment button is pressed while the lighting fixture is on, the blower unit is turned off. This operation is the same for (C), (D), and (E) in the figure. (Corresponding to claim 5) (B) When the human sensor 11 is made to function, in this case, the human sensor continuously detects the presence of a person for a certain period of time regardless of whether the blower unit is operating or stopped. When the lighting device 9 is turned on, the lighting device 9 is turned off unless the presence of a person is continuously detected for a certain period of time. (Corresponding to claim 1) (C) In the automatic operation type range hood, the detection means
After 10 detects the use of the cooking appliance B and the blower unit 4 starts the automatic operation, when the human sensor 11 continuously detects the presence of a person for a certain period of time, the lighting device 9 is turned on, and the human sensor detects When the presence of a person is no longer detected for a certain period of time, the lighting device 9 is turned off. Of course, the lit lighting device 9 is turned off when the blower unit 4 is stopped.
(Corresponding to claim 2) (D) Automatic operation type range hood, detecting means
After 10 detects the use of the cooker B and the blower unit 4 starts the automatic operation, the lighting fixture is forcibly turned on for a certain time, and the lighting fixture 9 is turned on and off thereafter.
Same as (C). In this case, the forced lighting for a certain period of time is the time required to stir or season the pot on the cooking utensil, and the time is, for example, 1
0 minutes. (Equivalent to claim 3) (E) In the automatic operation type range hood, the lighting device 9 is turned on by the detection of the motion sensor 11 as in the case of (B), and turned off by the (C) or (D). ) Is done for the same.
In addition, the figure illustrates a mode in which the light is turned off by (D).
(Corresponds to claim 4)

FIGS. 5 to 7 are time charts for turning on / off the lighting equipment of the type provided with the illuminance sensor 12 for measuring the brightness of the surface B of the cooking utensil in addition to the human sensor 11. During the automatic driving of No. 4, the human presence sensor 11 continuously detects the presence of a person for a certain period of time, and at that time, the brightness of the cookware B surface is below a certain value.
The luminaire 9 is turned on when measured by, and the luminaire 9 is turned off when the human sensor 11 no longer senses the presence of a person. That is, the lighting device 9 is turned on when the presence sensor 11 senses the presence of a person and when the illuminance sensor 12 measures the illuminance below a certain value.

[0020]

The range hood of the present invention is defined in claims 1 to 4.
With the configuration described in, the lighting fixture is turned on when a person is present in front of the cooking utensil for a certain period of time continuously, and is turned off when there is no person present for a certain period of time. It is possible to prevent the lighting fixture from being forgotten and it is economical. Then, the presence / absence of a person is used for the determination by the human sensor that controls the turning on / off of the lighting fixture.
Since the condition is that the absence is continuous for a certain period of time,
The luminaire does not blink when a cook or the like simply crosses the front of the cookware, and therefore the lighting does not flicker and become an obstacle. Further, the configuration according to the fifth aspect is effective when it is troublesome to turn on / off the lighting fixture by the human sensor. Further, with the configuration according to the sixth aspect, it is possible to prevent a malfunction of turning on / off the lighting fixture. Further, according to the configuration of claim 7, the lighting device is turned on only when the presence of a person is detected by the human sensor when the cooking utensil surface is darker than a predetermined brightness, so that the range hood can contribute to further energy saving. Can be provided.

[Brief description of drawings]

FIG. 1 is a front view showing an example of an embodiment of a range hood according to the present invention.

FIG. 2 is a cutaway side view of the same portion.

FIG. 3 is an electric circuit diagram of the device.

FIG. 4 is an explanatory view showing a pattern of turning on / off a lighting fixture.

FIG. 5 is a time chart showing an example of a pattern for turning on / off a lighting device in a range hood equipped with an illuminance sensor.

FIG. 6 is a time chart showing an example of another pattern.

FIG. 7 is a time chart showing an example of still another pattern.

[Explanation of symbols]

 A ... Range hood B ... Cooking equipment 1 ... Hood 4 ... Blower unit 9 ... Lighting equipment 10 ... Detecting means 11 ... Human sensor 12 ... Illuminance sensor

Claims (7)

[Claims] 1. A range hood in which a blower unit is housed in a hood having an open lower surface, and a lighting device for illuminating a cooking utensil such as a gas stove arranged below is provided in the hood in front of the cooking utensil. A human sensor for detecting the presence of a standing human is provided, and when the human sensor continuously detects the human presence for a certain period of time, the lighting device is turned on, and the human presence sensor continuously detects the human presence for a certain period of time. A range hood that turns off the lighting fixture when it no longer detects it. 2. A blower unit is housed in a hood having an open bottom surface, a lighting device for illuminating cooking utensils such as a gas stove arranged below is provided, and whether or not the cooking device is used is detected in the hood. Detection means is provided,
In the range hood in which the blower unit is automatically operated by the detection means detecting the use of the cooking utensil, and the blower unit is automatically stopped by the detection means detecting the stop of the use of the cooking utensil, the cooking utensil is included in the hood. A human presence sensor that detects the presence of a person standing in front of the human body is provided, and the human presence sensor continuously detects the presence of the person for a certain period of time after the detection unit detects the use of the cooking utensil and the blower unit starts the automatic operation. The range hood is characterized in that the lighting device is turned on when it is detected, and the lighting device is turned off when the presence sensor does not continuously detect the presence of a person for a certain period of time. 3. The lighting device is forcibly turned on for a certain period of time after the automatic operation of the blower unit is started, and thereafter, the lighting device is turned on when the presence sensor continuously detects the presence of a person for a certain period of time. The range hood according to claim 2, wherein the lighting device is turned off if the presence of a person is not continuously detected for a certain period of time. 4. The lighting device is lit when the presence of a person is continuously detected for a certain period of time by a motion sensor regardless of whether the blower unit is operating or stopped, and after lighting, the detecting means detects the use of the cooking device. Then, after the blower unit starts the automatic operation, the lighting fixture is turned on when the human presence sensor continuously detects the presence of the person for a certain period of time, and the lighting fixture is detected if the presence of the person is not continuously detected for the certain period of time. The range hood according to claim 2, wherein is turned off. 5. A lighting device is provided with a changeover switch for stopping the function of the motion sensor, and when the function of the motion sensor is stopped by operating the switch, the lighting device is interlocked with the operation / stop of the blower unit by the detection means. 3. The range hood according to claim 2, wherein is turned on and off. 6. The range hood according to claim 1, wherein the human sensor has a detection range within the width of the cooking utensil. 7. The hood is provided with an illuminance sensor for measuring the illuminance of the cookware surface, and the blower unit is in automatic operation.
Moreover, when the human presence sensor continuously detects the presence of a person for a certain period of time, when the illuminance sensor measures that the illuminance of the cooking utensil surface is below a certain value, the lighting fixture is turned on. The range hood according to claim 2.