JP2008175501A - Range hood - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve safe and effective cleaning for a filter by preventing leakage of a cleaning solvent. <P>SOLUTION: When the cleaning solvent is supplied to a cleaning vessel 4 for cleaning the filter, the liquid level is kept at such a level that effectively the filter is cleaned without leakage of liquid. When the water level is elevated, water is discharged by a drain valve 9 to control the liquid level. When the cleaning solvent leaks from a water storage pump 7, the cleaning vessel 4 and the drain valve 79 due to some abnormality, the cleaning solvent is caught by the cleaning solvent receiving tray 42, and after that, application of an electric current to a range hood is stopped to prevent leakage of water and short-circuit due to that leakage. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a range hood for cleaning a filter with a cleaning liquid.

  Conventionally, in this type of range hood, a filter is rotatably provided, and the filter is rotated in a cleaning tank filled with a cleaning liquid to wash away dirt (for example, see Patent Document 1).

  Hereinafter, the range hood will be described with reference to FIG.

As shown in the figure, in a hood 104 provided so as to be positioned above the kitchen appliance 101 and having a suction port 102 and a discharge port 103, an exhaust fan 105, and a filter 106, the same direction as the flow direction of oil smoke The rotating shaft 107 is provided so that the disk-shaped filter 106 can be rotated in the middle of the hood 104, and the box-shaped cleaning tank 109 having an open top surface is provided so that the upper end of the opening is flush with the rotating shaft 107. A filter 106 located below the rotary shaft 107 is immersed in the cleaning liquid 108 stored in the cleaning tank 109, and the part contaminated with oil or dust is cleaned.
JP-A-6-137630

  In such a conventional range hood for performing filter cleaning, there is a problem of leakage of cleaning liquid at the time of cleaning, and protection of corrosion and leakage of the surrounding area is required. In addition, since the cleaning liquid may be scattered around, a means for preventing scattering to the user is required.

  The present invention solves such a conventional problem, and constitutes a range hood that does not cause corrosion or leakage when a cleaning liquid leaks, and can prevent the cleaning liquid from scattering to the user. The purpose is to provide food.

  In order to achieve the above object, the range hood of the present invention has a suction port and a discharge port, an exhaust fan motor in the ventilation path connecting the suction port and the discharge port, the suction port and the exhaust port A filter provided between the fan motor, a water storage tank for storing the cleaning liquid for cleaning the filter, a cleaning liquid supply means for supplying the cleaning liquid to the water storage tank, and a water level of the cleaning liquid stored in the water storage tank. The range hood is provided, and after the cleaning liquid is detected at a predetermined water level by the water level detecting means, the supply of the cleaning liquid by the cleaning liquid supply means is stopped.

  By this means, the cleaning liquid can be maintained at a water level suitable for cleaning, and a range hood that prevents the cleaning liquid from leaking from the water storage tank can be obtained.

  Further, the other means of the range hood of the present invention includes a cleaning liquid discharging means for discharging the cleaning liquid stored in the water tank, and after detecting the water level of the cleaning liquid by the water level detecting means, the cleaning liquid is discharged by the cleaning liquid discharging means, A range hood is characterized in that the water level of the water storage tank is adjusted to a predetermined position.

  Even if foreign matter enters the water tank by this means, or even when the cleaning liquid is vigorously supplied and the water level rises, the range hood prevents the cleaning liquid from leaking by keeping the liquid level by discharging unnecessary cleaning liquid. Is obtained.

  Another means of the range hood of the present invention is a range hood characterized in that the water level detecting means detects the water level by a change in the refractive index of light.

  By this means, it is possible to detect whatever component is contained in the cleaning liquid, and since the water level detection part is not in contact with the cleaning liquid, a range hood with less malfunction due to electric leakage or dirt can be obtained.

  Another means of the range hood of the present invention is a range hood characterized in that the water level detecting means detects the water level with ultrasonic waves.

  By this means, it is possible to measure the distance to the water level, and since the detection part is not in contact with the cleaning liquid, a range hood with few malfunctions due to leakage or dirt can be obtained.

  Another means of the range hood of the present invention is a range hood characterized in that the water level detecting means detects the water level by changing the capacity.

  By this means, it is possible to detect whatever components are contained in the cleaning liquid, and the detection part can be mounted without taking up space, and since it is non-contact with the cleaning liquid, a range hood with few malfunctions due to electric leakage and dirt can be obtained. It is done.

  The other means of the range hood of the present invention is characterized in that an inclination detecting means for detecting the inclination angle of the range hood is provided, and the target water level of the cleaning liquid is changed according to the inclination angle detected by the inclination detecting means. This is a range hood.

  By this means, even if the range hood is attached in an inclined state, a range hood that corrects the water level of the water storage tank according to the inclination angle and prevents the cleaning liquid from leaking can be obtained.

  Further, the other means of the range hood of the present invention is provided with a display means for displaying the state to the user, and when the cleaning liquid remains in the water tank even after the filter cleaning is completed, the display means displays it. A range hood characterized by

  By this means, when the cleaning liquid is not discharged from the water storage tank for some reason, a range hood is obtained that prevents the user from removing the water storage tank and accidentally leaking the cleaning liquid.

  Further, the other means of the range hood of the present invention includes a cleaning liquid leak detecting means for detecting the leaked cleaning liquid and the scattered cleaning liquid. When the cleaning liquid leak detecting means detects the cleaning liquid, the predetermined energization is stopped. This is a characteristic range hood.

  By this means, when the cleaning liquid scatters or overflows from the water storage tank due to an earthquake or some kind of impact, a range hood that can prevent the leakage by stopping energization to the part that is electrically controlled is obtained. It is done.

  Another means of the range hood according to the present invention is a range hood characterized in that the cleaning liquid leakage detecting means detects the change in the refractive index of light.

  By this means, it is possible to obtain a range hood capable of safely detecting leakage of the cleaning liquid without leaking without contact.

  In addition, another means of the range hood of the present invention is a range hood characterized in that the cleaning liquid leakage detecting means detects the change in volume.

  By this means, the detection portion does not take up space and can be mounted even in a small space. Moreover, the range hood which can detect a washing liquid leak safely without leaking without contact is obtained.

  Another means of the range hood of the present invention is a range hood characterized in that a predetermined energization is stopped when a person touches the range hood during filter cleaning.

  By this means, when the cleaning liquid leaks, it is possible to obtain a range hood capable of stopping the power supply to the drive part that is electrically controlled and preventing the leakage.

  In addition, another means of the range hood of the present invention includes a front cover that prevents splashing of the cleaning liquid and / or prevents a person from touching a charging part inside the range hood, and the front cover is removed during filter cleaning. Is a range hood characterized by stopping energization.

  By this means, it is possible to obtain a range hood capable of preventing the cleaning liquid from scattering to the user and preventing leakage.

  According to the present invention, the exhaust fan motor has a suction port and a discharge port, and is provided between the suction port and the exhaust fan motor in a ventilation path connecting the suction port and the discharge port. A filter, a water storage tank for storing the cleaning liquid for cleaning the filter, a cleaning liquid supply means for supplying the cleaning liquid to the water storage tank, and a water level detection means for detecting the water level of the cleaning liquid stored in the water storage tank, After detecting the cleaning liquid at a predetermined water level by the water level detection means, it is a range hood characterized by stopping the supply of the cleaning liquid by the cleaning liquid supply means, the cleaning liquid can be maintained at a water level suitable for cleaning, Moreover, the range hood which prevents the washing | cleaning liquid leak from a water tank can be provided.

  The invention according to claim 1 of the present invention has a suction port and a discharge port, an exhaust fan motor in an air passage connecting the suction port and the discharge port, the suction port and the exhaust fan motor, A filter provided between, a water storage tank for storing a cleaning liquid for cleaning the filter, a cleaning liquid supply means for supplying the cleaning liquid to the water storage tank, and a water level detection for detecting a water level of the cleaning liquid stored in the water storage tank And a range hood characterized in that after the cleaning liquid is detected at a predetermined water level by the water level detecting means, the supply of the cleaning liquid by the cleaning liquid supply means is stopped, and the target water level of the cleaning liquid is set in advance. The liquid level can be maintained at the target water level by stopping the supply of the cleaning liquid by the cleaning liquid supply means after the target water level is detected by the water level detection means. According to the present invention, it is possible to prevent the cleaning liquid from leaking and to secure the cleaning liquid at a water level suitable for cleaning.

  The invention according to claim 2 of the present invention further comprises a cleaning liquid discharging means for discharging the cleaning liquid stored in the water tank, and after the cleaning liquid is detected at a predetermined water level by the water level detecting means, the cleaning liquid is discharged by the cleaning liquid discharging means. The water level of the water storage tank is adjusted to a predetermined position. The range hood according to claim 1, wherein the cleaning liquid in the water storage tank exceeds the target water level for some reason. It becomes possible to drain by the discharge means and maintain the liquid level at the target water level. According to the present invention, it is possible to prevent the cleaning liquid from leaking and to control the cleaning liquid at a water level suitable for cleaning.

  The invention according to claim 3 of the present invention is the range hood according to claim 1 or 2, wherein the water level detecting means detects the water level based on the refractive index of light, and the light is refracted in the liquid. It is possible to detect the cleaning liquid at the target water level by using According to the present invention, the liquid level can be maintained at the target water level by detecting the liquid level at the target water level and stopping the supply of the cleaning liquid by the cleaning liquid supply means.

  The invention according to claim 4 of the present invention is the range hood according to claim 1 or 2 characterized in that the water level detecting means detects the water level by means of ultrasonic waves, and is required for reflection of ultrasonic waves. It becomes possible to measure the water level from time. According to the present invention, the liquid level can be maintained at the target water level by detecting the liquid level at the target water level and stopping the supply of the cleaning liquid by the cleaning liquid supply means.

  The invention according to claim 5 of the present invention is the range hood according to claim 1 or 2 characterized in that the water level detecting means detects the water level by changing the capacity, and the water tank exterior has a small capacity. It is possible to detect the cleaning liquid from the binding capacity formed between the cleaning liquid and the electrode by applying an electrode for charging and discharging. According to the present invention, the liquid level can be maintained at the target water level by detecting the liquid level at the target water level and stopping the supply of the cleaning liquid by the cleaning liquid supply means.

  The invention according to claim 6 of the present invention is characterized in that an inclination detecting means for detecting an inclination angle for attaching the range hood is provided, and the target water level of the cleaning liquid is changed according to the inclination angle detected by the inclination detecting means. The range hood according to claim 1, 2, 3, 4, or 5, wherein the target angle of the cleaning liquid can be changed by detecting the mounting angle of the range hood and the inclination of the water storage tank.

  Further, the invention according to claim 7 of the present invention is provided with a display means for displaying the state to the user, and when the cleaning liquid remains in the water tank even after the filter cleaning is completed, the display means displays it. In the range hood according to claim 1, 2, 3, 4, 5 or 6, it is possible to notify the user that the cleaning liquid remains in the water storage tank.

  The invention according to claim 8 of the present invention further includes a cleaning liquid leak detecting means for detecting leaked cleaning liquid and scattered cleaning liquid, and when the cleaning liquid leak detecting means detects the cleaning liquid, the predetermined energization is stopped. The range hood according to claim 1, 2, 3, 4, 5, 6 or 7, wherein when the cleaning liquid leakage and the cleaning liquid scattering are detected by the cleaning liquid leakage detecting means, electrical control is performed. It is possible to stop energization of the part and prevent corrosion and leakage of peripheral parts.

  The invention according to claim 9 of the present invention is the range hood according to claim 8, characterized in that the cleaning liquid leakage detecting means detects the change in the refractive index of light. It is possible to detect corrosion of the cleaning liquid and scattering of the cleaning liquid by using refraction, and to stop the energization of the part where electric control is performed, thereby preventing the corrosion and leakage of peripheral parts.

  According to a tenth aspect of the present invention, in the range hood according to the eighth aspect, the cleaning liquid leakage detecting means detects the change by changing the volume, and a minute amount is formed on an inner wall of a housing such as a water storage tank. Applying an electrode that charges and discharges with a capacity, detects the leakage of the cleaning liquid and the scattering of the cleaning liquid using the capacity change that changes between the cleaning liquid and the electrode, and stops the energization of the part that is performing electrical control. It becomes possible to prevent corrosion and leakage of parts.

  The invention according to claim 11 of the present invention is characterized in that, when a person touches the range hood during filter cleaning, predetermined energization is stopped. 7. The range hood described in 7, 8, 9 or 10 is used. When the capacitance that changes due to the human body touching the range hood main body is detected, the energization of the part that is electrically controlled is performed. By stopping the operation, it is possible to prevent corrosion and leakage of peripheral parts.

  Further, the invention according to claim 12 of the present invention includes a front cover for preventing the splashing of the cleaning liquid and / or preventing a person from touching the charging part inside the range hood, and the front cover is removed during the filter cleaning. In the case, the energization is stopped, and the range hood according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11 is provided, and the front cover is removed. If this happens, it will be possible to turn off the power and prevent corrosion and leakage of the surrounding parts.

  Embodiment 1 of the present invention will be described below with reference to the drawings.

(Embodiment 1)
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing the same range hood, FIG. 2 is a diagram showing the configuration of the filter cleaning function of the range hood, FIG. 3 is a diagram showing the principle of detecting the liquid level of the cleaning liquid by laser light of the range hood, FIG. FIG. 3B is a diagram showing the liquid level detection principle of the same range hood, FIG. 4 is a diagram showing an operation switch of the same range hood, and FIG. FIG. 6 is a flow chart showing the filter cleaning process of the range hood, FIG. 6 is a view showing the principle of detecting a liquid leak in the washing basin of the range hood, FIG. 7 is a view showing the front cover of the range hood, and FIG. FIG. 7B is a side view of the front cover of the same range hood.

  As shown in FIGS. 1 to 7, the range hood 1 is attached to the upper portion of the cooking appliance 2, and the exhaust fan motor 9 inside the range hood 1 removes oil smoke generated when the cooking appliance 2 is used from the rectifying plate 3 to the suction port 77. Then, the air is sucked in through the ventilation path 78 and the filter 5 and discharged from the discharge port 6 to the outside. The filter 5 is attached to the ventilation path of the oil smoke and removes oil and dust contained in the oil smoke. The filter 5 has a disk structure, and a rotary shaft 10 is provided at the center of the filter. A cleaning tank 4 is provided at the lower part of the filter 5 and is configured to cover the lower half surface of the filter 5 from the rotating shaft in a non-contact manner.

  Here, the filter 5 has been subjected to a hydrophilic coating, and the water contained in the oil smoke forms a water film on the surface due to the hydrophilic property, so that the attached oil stains can be easily lifted and removed.

  The water storage tank 12 can be taken out when the user opens the front cover 13 on the front surface of the bottom of the range hood, and when performing filter cleaning, the user supplies the cleaning liquid to the water storage tank 12 and returns it to a predetermined position. When the user closes the front cover 13 and then presses the cleaning switch 14 prepared in the operation switch 8 shown in FIG. 4, the status display LED 22 arranged in the vicinity of the cleaning switch 14 is turned on, and the water storage pump 7 is turned on. The suction of the cleaning liquid in the water storage tank 12 is started. In the cleaning tank 4, the cleaning liquid supplied from the water storage pump 7 is stored in the tank and the filter 5 is immersed.

  Here, the cleaning liquid uses warm water or tap water to remove filter dirt. Further, a laser transmitter 15 that transmits laser light, a laser transmitter 21, and a dew condensation sensor 23 are attached to the side surface of the cleaning tank 4 side by side. FIG. 3 shows the principle of cleaning liquid level detection using laser light.

  In the cleaning tank 4, the dew condensation sensor 23, the laser receiver 17, the laser transmitter 15, the laser receiver 16, and the laser transmitter 21 are attached in the vertical order from the bottom.

  In this state, in a state where the cleaning liquid is not stored in the cleaning tank 4, the laser beam 19 transmitted from the laser transmitter 15 is irradiated toward the laser receiver 17 provided on the opposite side. On the other hand, when the cleaning liquid is supplied into the cleaning tank 4, the dew condensation sensor 23 is first immersed to determine the presence or absence of the liquid. If the liquid level continues to rise after that, the laser beam 19 will be blocked next. Then, since the laser beam 19 is refracted in the liquid, the laser receiver 17 cannot receive the laser beam 19.

  The liquid level at the moment when the laser light 19 is refracted is set in advance as a target water level 18 suitable for filter cleaning, and the water storage pump 7 stops supplying the cleaning liquid so that the liquid level stops at the target water level 18.

  Here, the target water level 18 suitable for filter cleaning refers to a water level at which the entire half surface of the filter 5 can be immersed, and a level at which the cleaning liquid does not overflow from the cleaning tank 4 even if the filter 5 is rotated in the cleaning liquid.

  The liquid level detecting means using the laser beam can detect the liquid level in a non-contact manner, so that the sensor itself can be used repeatedly without being contaminated. In addition, since the liquid level can be detected from any liquid based on the detection principle, even if detergent or oil is mixed in the cleaning liquid, it can be used without erroneous detection. Here, the laser beam may be any laser beam that is refracted by the cleaning liquid, and may be composed of a visible light laser, a semiconductor laser, or the like, and its wavelength may be ultraviolet light, visible light, or infrared light.

  Moreover, with the means for stopping the supply of the cleaning liquid at the target water level as described above, if the water level at which the cleaning liquid does not overflow and the entire surface of the filter can be submerged in the cleaning liquid is set as the target water level in advance, the filter is reliably washed without leakage. It is possible.

  In addition, if the response of the stoppage of the water storage pump 7 is delayed, or if foreign matter enters the water storage tank and the water level of the cleaning liquid exceeds the target water level 18, the liquid level of the cleaning liquid is detected by the laser transmitter 21 and the laser receiver 16. The drain valve 79 attached to the tank 4 is opened to drain the cleaning liquid to the drain tray 44. Then, drainage is performed until the liquid level is not detected by the laser receiver 16 and the water level of the cleaning liquid is maintained in the vicinity of the target water level 18.

  When the supply of the cleaning liquid of the water storage pump 7 is stopped at the target water level 18 by the above-described liquid level detection operation, the filter 5 is rotated in the cleaning liquid when the motor 20 starts operation, and oil stains accumulated in the filter 5 Clean the dust.

  When the filter 5 is washed for about 5 minutes, the motor 20 is stopped and the drain valve 79 is opened. When all of the cleaning liquid in the cleaning tank 4 is flowed to the drain tray 44 through the drain valve 79, the status display LED 22 is turned off to notify the user that the filter 5 has been cleaned.

  Here, it is assumed that the determination of completion of drainage of the cleaning liquid in the cleaning tank 4 is made when the liquid detection by the dew condensation sensor 23 disappears.

  Hereinafter, the operation flowchart in the filter cleaning of the range hood 1 is shown in FIG.

  When the cleaning switch 14 is operated in STEP 24, the status display LED 22 is turned on in STEP 25 to indicate that the filter cleaning has started. Next, at STEP 26, the water storage pump 7 starts to be driven, sucks the cleaning liquid from the water storage tank 12, and starts supplying the cleaning liquid to the cleaning tank 4. In step 27, the dew condensation sensor 23 provided on the inner wall of the cleaning tank detects the cleaning liquid. In step 28, the laser light 19 irradiated from the laser transmitter 15 is refracted by the cleaning liquid, and the laser receiver 17 receives the laser light 19. When no more, the operation of the water storage pump 7 is stopped in STEP 29, and the supply of the cleaning liquid is stopped. If the laser receiver 16 is receiving the laser light emitted from the laser transmitter 21 in STEP 30, the operation of the motor 20 is started in STEP 31, and the filter 5 is rotated in the cleaning liquid to start cleaning.

  Then, after 5 minutes, the motor 20 is stopped at STEP 32 to finish the filter cleaning, the drain valve 79 is opened at STEP 33, and the cleaning liquid in the cleaning tank 4 is drained to the drain tray 44. When the liquid detection of the dew condensation sensor 23 disappears in STEP 34, the status display LED 22 is turned off in STEP 35, and the filter cleaning completion is displayed.

  Also, in STEP 27, when the water is not detected by the dew condensation sensor 23 even after 60 seconds have passed since the water storage pump 7 is driven, the water supply abnormality display 40 of the operation switch 8 is turned on in STEP 36 to notify the user of the abnormality. In step 37, the water storage pump 7 is stopped.

  In STEP 30, if the laser receiver 16 cannot receive the laser light emitted from the laser transmitter 21 even though the water storage pump 7 is stopped, the drain valve 79 is opened in STEP 38 to receive the laser beam. Drain until the device 16 can receive the laser beam.

  In STEP 34, if the condensation sensor 23 detects liquid even though the cleaning tank 4 is drained, the drain abnormality display 41 of the operation switch 8 is turned on in STEP 39 to notify the user of the abnormality. To do. This assumes the case where drainage is not possible due to some abnormality such as when oil washed off by washing adheres to the valve, and it is possible to prompt the user to perform poor cleaning or maintenance of the cleaning tank. .

  In addition, the cleaning liquid overflows from the cleaning tank 4 due to an earthquake or the cleaning liquid leaks from the pump or the like due to clogging of the water storage pump 7 after the cleaning switch 14 shown in the above flow is pressed until the filter cleaning is completed. It is assumed that the cleaning liquid escapes from the predetermined path and overflows to the outside due to some abnormality. However, in that case, the overflowing washing liquid can be collected by the washing liquid receiving tray 42 attached to the lowermost part, and leakage to the outside of the range hood 1 can be prevented.

  As shown in FIG. 6, the cleaning liquid receiving tray 42 is provided with a dew condensation sensor 43, and the leakage of the cleaning liquid can be detected by the reaction of the dew condensation sensor 43.

  When leakage of the cleaning liquid is detected, the energization of the water storage pump 7, the motor 20, and the drain valve 79 is stopped, and it is possible to prevent the cleaning liquid from touching the exposed charging unit and causing electric leakage.

  Further, as shown in FIG. 7, the front cover 13 is configured to be attached to the range hood 1 by hooking a convex portion on the hook portion 45 of the range hood 1. Further, a concave portion 46 is provided on the side surface of the range hood 1, and a convex portion 47 is provided on the side surface of the front cover 13. When the front cover 13 is mounted, the convex portion 47 is inserted into the concave portion 46 and the power limit SW 48 in the concave portion is inserted. Push down the lever. The power limit SW 48 can turn the power of the range hood 1 on and off, and is configured to supply a power voltage to the range hood 1 when the lever is pushed down and to be turned off when the lever is returned.

  By the function of the power limit SW 48, when the user removes the front cover and takes out the drain tray, it is possible to prevent a disaster such as electric shock by touching the inside of the leaked range hood. Even if the user removes the front cover 13 during cleaning, the energization is cut off, so that the cleaning liquid can be prevented from splashing to the user.

(Embodiment 2)
Embodiment 2 of the present invention will be described below with reference to the drawings. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  8 and 9 show a filter cleaning configuration in the range hood 49 according to the second embodiment of the present invention. The filter 50 is attached to the ventilation path of the oil smoke and removes oil and dust contained in the oil smoke. The filter 50 has a disk structure, and a rotation shaft 59 is provided at the center of the filter so that the filter 50 is rotatable in the ventilation path. A cleaning tank 52 is provided below the filter 50, and is configured to cover the lower half surface of the filter 50 from the rotating shaft in a non-contact manner.

  When performing the filter cleaning, the user supplies the cleaning liquid to the water storage tank 54. Here, the cleaning liquid uses warm water or tap water to remove filter dirt.

  When the cleaning switch 14 prepared for the operation switch 8 is pressed, the status display LED 22 disposed in the vicinity of the cleaning switch 14 is turned on, and the water storage pump 53 starts sucking up the cleaning liquid in the water storage tank 54. In the cleaning tank 52, the cleaning liquid supplied from the water storage pump 53 is stored in the tank and the filter 50 is immersed.

  An ultrasonic sensor 51 is provided above the cleaning tank 52 to detect the level of the cleaning liquid stored in the cleaning tank 52. FIG. 10 shows a liquid level detection method using the ultrasonic sensor 51.

  The ultrasonic sensor 51 measures the time when the ultrasonic wave 60 generated by itself hits the liquid surface and reflects back, and measures the distance from the sensing part to the liquid surface. When the cleaning liquid level reaches the target water level 61 suitable for cleaning, the operation of the water storage pump 53 is stopped and the cleaning liquid supply is stopped.

  Here, even if the liquid level exceeds the target water level 61, since the ultrasonic sensor 51 always detects the distance from the liquid level, the drain valve 56 is opened while feeding back the liquid level, and the liquid level reaches the target level. The water level is controlled by draining until the water level reaches 61. The cleaning liquid drained here is stored in the drain tray 57.

  When the liquid level reaches the target water level 61 by the above control, the filter 50 is rotated and filter cleaning is started. When the filter cleaning is completed, the drain valve 56 is opened and all the cleaning liquid is drained to the drain tray 57.

  Here, if drainage is not performed due to any abnormality, the ultrasonic sensor 51 detects that the cleaning liquid remains in the cleaning tank, and displays a drainage abnormality display 41 to prompt the user to perform abnormality.

  In addition, when the range hood 49 is attached to an inclined wall, the cleaning tank 52 is also assumed to be inclined. In that case, if the cleaning liquid is stored up to a predetermined target water level 61, the cleaning liquid overflows from the cleaning tank 52. Therefore, an inclination sensor 55 that detects the inclination of the cleaning tank 52 is attached to the cleaning tank 52. FIG. 11 shows the configuration of the cleaning tank 52 and the inclination sensor 55.

  As shown in FIG. 11, when the cleaning tank 52 tilts 60 degrees in the state of the target water level 61, the cleaning liquid overflows. Therefore, the inclination sensor 55 detects that the inclination exceeds 60 degrees and changes the target water level to the water level 62. So feedback. The drain valve 56 discharges the cleaning liquid until the water level detected by the ultrasonic sensor 51 reaches the water level 62, and controls so that the cleaning liquid does not overflow from the cleaning tank 52. Here, the same effect can be obtained even if the inclination sensor 55 is replaced with a gyro sensor and a fall sensor.

  Assuming that the cleaning liquid leaks from the water storage pump 53, the cleaning tank 52, and the drain valve 56 due to an abnormality such as oil clogging in the pipe, the cleaning liquid receiving tray 58 is attached to the bottom so that the leaked cleaning liquid can be caught. Yes. The cleaning liquid tray 58 is made of polycarbonate, and a film electrode sheet 65 is attached to the lower back side by a double-sided tape 63. This film electrode sheet 65 is an electrode made of conductive ink on a film, and the electrode is connected to the control circuit 64.

  When the cleaning liquid leaks into the cleaning liquid receiving tray 58, the capacitance stored in the electrode is changed by the cleaning liquid in the cleaning liquid receiving tray 58, so that the control circuit 64 detects this change and detects the cleaning liquid leakage. Is possible.

  In addition, when the control circuit 64 detects a cleaning liquid leak, the energization of the water storage pump 53 and the drain valve 56 that are energized is stopped to prevent a secondary disaster such as further leakage of the cleaning liquid or an electric shock from the user. Is done.

  As described above, the range hood of the second embodiment can measure the liquid level of the cleaning liquid in a non-contact manner by the ultrasonic sensor 51 attached to the upper part of the cleaning tank. Surface control, residual water detection, drainage abnormality, etc. can be detected.

  Further, by attaching the inclination sensor 55 to the cleaning tank 52, it becomes possible to detect the inclination of the cleaning tank, and control can be performed so that the cleaning liquid in the cleaning tank does not overflow even if the cleaning tank 52 is inclined. .

  In addition, by attaching the film electrode sheet 65 to the cleaning liquid receiving tray 58 made of polycarbonate, it becomes possible to detect the cleaning liquid that spills into the cleaning liquid receiving tray 58 in a non-contact manner without worrying about substances and dirt contained in the cleaning liquid. In addition, it is possible to configure an abnormality detection means with few malfunctions.

  The cleaning liquid detection means using the film electrode sheet can also be used as the liquid level detection means of the cleaning tank. FIG. 13 shows an example in which the film electrode sheet is applied to a cleaning tank.

  As shown in FIG. 13, a film electrode sheet 67 is attached to the side surface of the washing tank 66 made of polycarbonate. An electrode 68, an electrode 69, and an electrode 70 are formed of conductive ink on the film electrode sheet 67, and are individually connected to the control circuit. Further, the water level 73 is a liquid level suitable for cleaning, and this is set as a target water level suitable for filter cleaning.

  In this state, storage of the cleaning liquid in the cleaning tank 66 is started, and when the liquid level reaches the water level 71 in the direction perpendicular to the center of the electrode 68, the capacity of the electrode 68 starts to change due to the coupling capacity with the cleaning liquid. With this change, the control circuit detects that the liquid level has reached the water level 71.

  Next, when the liquid level reaches the water level 72 in the direction perpendicular to the center of the electrode 69, the control circuit detects that the liquid level has reached the water level 72 in the same principle as the electrode 68.

  Finally, when the liquid level reaches the water level 73 in the direction perpendicular to the center of the electrode 70, the control circuit detects that the liquid level has reached the water level 73 by the same principle as the electrode 68, and stops supplying the cleaning liquid here.

  In this method, since the liquid level can be detected in three stages by the electrode 68, the electrode 69, and the electrode 70, there is an advantage that it has high detection accuracy and can easily detect an abnormality.

  As an example of a safety device using a film electrode sheet, FIG. 14 shows an example in which a film electrode sheet is applied to the front cover 74.

  A film electrode sheet 75 and a film electrode sheet 76 are inserted on both sides inside the front cover 74, and these electrodes are connected to a control circuit. The material of the front cover 74 is made of glass, and when a human body comes into contact with the periphery of the front cover 74 where the electrodes are attached, human body detection is performed by the capacitance formed between the human body and the electrodes. With this configuration, if a person touches the front cover 74 until the cleaning switch 14 is operated and the filter cleaning is completed, the filter cleaning is immediately interrupted. As a result, when the user accidentally removes the front cover 74 during filter cleaning, the cleaning liquid can be prevented from falling on the user, and leakage due to leakage of the cleaning liquid can be prevented.

  The range hood of the present invention can be diverted to air conditioners, dehumidifiers, humidifiers, etc. that require filter replacement and maintenance, and is equipped with a heater function, so that new functions such as filter drying after filter cleaning are provided. It can be added, and can be applied not only for home use, but also for business use, industrial filter cleaning, food use and the like.

The figure which shows the range hood of Embodiment 1 of this invention Diagram showing the configuration of the filter cleaning function of the same range hood The figure which shows the liquid level detection principle of the cleaning liquid by the laser beam of the same range hood ((a) The figure which shows the liquid level detection means of the same range hood, (b) The figure which shows the liquid level detection principle of the same range hood) The figure which shows the operation switch of the same range hood Flow chart showing the filter cleaning process of the same range hood The figure which shows the liquid leak detection principle of the washing liquid saucer of the same range hood The figure which shows the front cover of the same range hood ((a) The front view of the front cover of the same range hood, (b) The front cover side view of the same range hood) The figure which shows the range hood of Embodiment 2 of this invention Diagram showing the configuration of the filter cleaning function The figure which shows the liquid level detection method by the same ultrasonic sensor ((a) Front view of the same liquid level detection principle, (b) Side view of the same liquid level detection principle) The figure which shows the structure of the washing tank and the inclination sensor ((a) The figure which shows the inclination 0 degree of the same liquid level detection principle, (b) The figure which shows the inclination 60 degree of the same liquid level detection principle) Diagram showing the principle of leak detection The figure which shows the example which applied the film electrode sheet to the washing tank ((a) Front view of the liquid level detection principle by the film electrode sheet, (b) Side view of the liquid level detection principle by the film electrode sheet) The figure which shows the example which applied the film electrode sheet to the front cover ((a) The front view which shows human detection by the film electrode sheet, (b) The back view which shows human detection by the film electrode sheet) The figure which shows the structure of the conventional range hood

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Range hood 2 Cooking equipment 3 Current plate 4 Washing tank 5 Filter 6 Discharge port 7 Water storage pump 8 Operation switch 9 Exhaust fan motor 10 Rotating shaft 11 Cleaning liquid tray 12 Water storage tank 13 Front cover

Claims (12)

An exhaust fan motor in a ventilation path connecting the suction port and the discharge port, a filter provided between the suction port and the exhaust fan motor, and the filter. A water storage tank for storing the cleaning liquid for cleaning, a cleaning liquid supply means for supplying the cleaning liquid to the water storage tank, and a water level detection means for detecting the water level of the cleaning liquid stored in the water storage tank. A range hood characterized in that the supply of the cleaning liquid by the cleaning liquid supply means is stopped after detection at a predetermined water level. A cleaning liquid discharging means for discharging the cleaning liquid stored in the water storage tank is provided. After the cleaning liquid is detected at a predetermined water level by the water level detecting means, the cleaning liquid is discharged by the cleaning liquid discharging means, and the water level of the water storage tank is set at a predetermined position. The range hood according to claim 1, wherein the range hood is adjusted. The range hood according to claim 1 or 2, wherein the water level detecting means detects the water level by a change in the refractive index of light. The range hood according to claim 1 or 2, wherein the water level detecting means detects the water level with ultrasonic waves. The range hood according to claim 1 or 2, wherein the water level detecting means detects the water level by changing the capacity. 6. An inclination detection means for detecting an attachment inclination angle of a range hood is provided, and the target water level of the cleaning liquid is changed according to the inclination angle detected by the inclination detection means. The described range hood. A display means for displaying a state to a user is provided, and when the cleaning liquid remains in the water tank even after the filter cleaning is completed, the display means displays the cleaning liquid. The range hood according to 4, 5, or 6. A cleaning liquid leak detecting means for detecting a leaked cleaning liquid and a scattered cleaning liquid is provided, and when the cleaning liquid leak detecting means detects the cleaning liquid, predetermined energization is stopped. The range hood according to 5, 6, or 7. 9. The range hood according to claim 8, wherein the cleaning liquid leakage detecting means detects the change in the refractive index of light. 9. The range hood according to claim 8, wherein the cleaning liquid leakage detecting means detects the change in volume. The range hood according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10, wherein a predetermined energization is stopped when a person touches the range hood during filter cleaning. A front cover for preventing splashing of the cleaning liquid and / or preventing a person from touching a charged part in the range hood, and when the front cover is removed during filter cleaning, the power supply is stopped. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11.

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