JP3308424B2 - Ventilation fan for kitchen - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking place for discharging an atmosphere (cooking exhaust gas) containing oil smoke, steam, and combustion exhaust gas from cooking utensils generated in a cooking place such as a restaurant kitchen or a home kitchen. For ventilation fan. In particular, it has an oil filter for catching oil smoke and the like in the exhaust gas, and has a function of notifying a user that the time limit for replacing or cleaning the oil filter (hereinafter referred to as replacement) has been reached. It relates to a ventilation fan for a kitchen.

[0002]

2. Description of the Related Art Above or beside a cooking heater such as a gas stove, a ventilation fan for a cooking place for discharging cooking exhaust gas is installed. An oil filter (mesh filter or the like) for catching oil smoke and floating dust (hereinafter referred to as oil smoke or the like) in the exhaust gas is attached to many kitchen ventilation fans.

[0003] The oil filter gradually becomes dirty with oil or the like as it is used, and the suction of the ventilation fan becomes worse. Therefore, when the dirt reaches a certain level, it must be replaced or cleaned (washed). As a method of determining the time to replace the oil filter or the like, generally, the filter surface is visually observed to determine whether the filter is dirty, or based on experience, the filter is replaced after a certain period of use.

[0004]

However, at present, there is almost no appropriate guideline on how much the oil filter should be replaced. Therefore, since the dirt on the oil filter surface is visually or empirically determined, it is often not noticed that the dirt has become severe, and cleaning becomes difficult. Further, in many cases, even if the inside of the range hood becomes dirty, it is not noticed. Even if it is better to clean the inside of the range hood at an appropriate time, it is left as it is.

The present invention has been made to solve the above-mentioned problems, and to provide a ventilation fan for a kitchen which has a function of notifying a user that a time limit for replacing an oil filter or the like has been reached. Aim.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a ventilation fan for a kitchen according to the present invention has an atmosphere (cooking exhaust gas) containing oil smoke and steam generated in the kitchen, combustion exhaust gas from a cooking heating appliance, and the like. An exhaust fan having an air inlet opening into the kitchen, an exhaust fan for sucking and discharging exhaust air into the exhaust air passage, and an exhaust fan provided at an air inlet of the exhaust air passage. In addition, an oil filter that captures oil smoke and the like in the exhaust gas, an exhaust temperature sensor that detects the exhaust temperature at the intake port of the exhaust passage, and the operating time of the fan after replacement or cleaning of the oil filter are determined by the exhaust temperature. A time when the exhaust temperature exceeds a predetermined value (classified temperature) (high-temperature operation time T _H ) and a time when the exhaust gas temperature is equal to or lower than the predetermined value (the low-temperature operation time T _H ).
_L ), an oil filter cumulative use time calculating means for weighting the high temperature operation time and calculating an oil filter cumulative use time (T _T ), and an oil filter cumulative use time And a notifying means for notifying a user when the cumulative use time of the oil filter exceeds a predetermined value (use limit time). It is characterized by.

[0007]

The present inventors have found that the following relationship exists between the exhaust gas temperature and the contamination of the oil filter.
In other words, the exhaust temperature is high when cooking a cooking oil such as a tempura or fry, using a stove with a strong heat with the pan open, or using a large number of stove burners at the same time. In such a case, since oil fumes and the like are prosperous, much dirt adheres to the oil filter.

On the other hand, the low exhaust temperature is caused by
This is the case where the stove is used with a weak heat with the pan closed, or the case where only the cooking area is ventilated without igniting the stove burner. In such a case, since only the combustion exhaust gas and a small amount of steam that do not contain much dirt components are emitted, the dirt attached to the oil filter is small.

[0009] After all, even during the operation time of the ventilation fan for the kitchen,
It can be said that a large amount of dirt adheres during high-temperature operation, and a small amount of dirt adheres during low-temperature operation. Therefore, after replacing the oil filter, etc., the high-temperature operation time and the low-temperature operation time are separately integrated, the high-temperature operation time is weighted, and the cumulative use time of the oil filter is calculated. If it is determined that the oil filter needs to be replaced when the use time exceeds the use time limit, the user is notified and an oil filter dirt automatic warning having a higher correlation with the actual dirt condition can be performed.

The low-temperature operation time is ignored,
Only the high-temperature operation time may be used as the oil filter use time. Further, the high-temperature level may be further divided into two stages, and the weighting coefficients may be respectively changed.

[0011]

Embodiments of the present invention will be described below. FIG.
It is sectional drawing which shows the ventilation fan for cooking facilities (ventilation fan with a range hood) which concerns on one Example of this invention. The ventilation fan 1 with a range hood of FIG. 1 includes a range hood 3, a fan 13, an operation panel 9, and the like, and is installed above a gas stove in a cooking place.

The range hood 3 is a box having an intake port 5 which is largely opened downward. The intake port 5 is provided with an oil filter 7 so as to cover the intake port 5 on one side.
The inside of the range hood 3 is an exhaust passage 8 extending in the depth direction and connected to an exhaust duct 17. An exhaust fan 13 is mounted behind the range hood 3. When the exhaust fan 13 rotates, an exhaust flow is generated from the intake port 5 toward the exhaust duct 17 in the exhaust flow path 8, and cooking exhaust gas outside the intake port 5 passes through the oil filter 7 and is sucked into the range hood 3. Is done. The suctioned cooking exhaust gas is supplied to the exhaust duct 17.
The air is discharged to the outside and exhaust gas treatment equipment. When the cooking exhaust gas passes through the oil filter 7, oil smoke and floating dust in the cooking exhaust gas are trapped in the oil filter 7.

The above configuration is the same as that of a conventional ventilation fan with a range hood, and the following points are characteristic configurations of the embodiment of the present invention. This will be described with reference to the block diagram of FIG. FIG. 2 is a block diagram showing a control system of the ventilation fan of FIG. A temperature sensor 21 is attached to the intake port 5 on the back side of the oil filter 7 (downstream of the exhaust flow). The temperature sensor 21 detects the exhaust gas temperature at the intake port 5 and outputs a temperature signal to the operation integrating means 3 in the control unit 11.
Send to 1. The operation integrating means 31 combines the signal from the fan ON-OFF switch 25-1 (or the motor of the fan 13) with the time when the exhaust gas temperature exceeds the sectional temperature (high-temperature operation time _TH ) and the exhaust gas temperature. Is divided into the time when the temperature is equal to or lower than the classification temperature (low-temperature operation time T _L ), and the operation time of the fan is integrated. The information on _TH and _TL is sent to the oil filter cumulative use time calculating means 33. When the reset switch 25-2 is pressed after replacing the oil filter, each operation time is reset to zero. The operating time at the time of resetting may be stored in memory to determine the total operating time of the ventilation fan.

Oil filter cumulative use time calculating means 33
Calculates the cumulative use time T _T based on the following equation. T _T = _TH × α + _TL (α> 1) The cumulative use time may be calculated by the following equation. T _T = T _H + T _L × β (0 ≦ β <1) If the degree of dirt on the oil filter is negligible when the exhaust temperature is equal to or lower than the classification temperature, that is, when β = 0,
T _T = T _H.

The comparing means 35 compares the stored use limit time with the accumulated use time T _T. And
When the cumulative use time T _T exceeds the use time limit, the filter replacement sign lamp 23 is turned on to notify the user and prompt the user to replace the filter.

The control operations of the above components will be described together with reference to the flowchart of FIG. After the start, it is checked whether or not the fan is operating (S1). Fan stopped (S
In the case of 1 (NO), the process returns. If the fan is operating (YES in S1), the process proceeds to S2.

In S2, the exhaust gas temperature is set to the segment temperature (for example, 70
℃) Check below. If the temperature is equal to or lower than the section temperature (YES in S2), the process proceeds to S3, and if the temperature exceeds the section temperature (S2).
(NO in 2) Proceed to S4. In S3, a new low-temperature operation time _TL is calculated by adding the unit time of the control loop to the accumulated low-temperature operation time _TL up to now. In S4, the integrated hot operating time T _H up to now by adding a unit of control loop time to calculate a new high-temperature operation time T _H.

Next, the program proceeds to S5, in which the accumulated use time T _{T is set} to T _T.
= _TH × α + _TL (Example 3 of α).
Next, the process proceeds to S6, where the accumulated use time T _T is compared with the use limit time (900 hours in one example). Cumulative use time T _T is the case within the allowable limit hours (NO at S6) returns. If the cumulative usage time T _T exceeds the allowable limit time (Y in S6
ES) proceeds to S7, and turns on the sign lamp to urge the user to replace the oil filter.

Although not shown in the present embodiment, the following components can be added. Display panel for low-temperature operation time, high-temperature operation time, accumulated use time, etc. Display panel for exhaust temperature Also, in this embodiment, a ventilation fan with a range hood was used, but a wall-mounted ventilation fan without a range hood, etc. The present invention is also applicable to

[0020]

As is apparent from the above description, the ventilation fan for a kitchen according to the present invention has the following effects. The user can easily know the appropriate time to replace the oil filter or the like. This eliminates the need to leave the oil filter too dirty. Therefore, filter cleaning and the like can be performed easily. Dirt in the range hood and the like can be managed in the total time.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a ventilation fan for a kitchen (a ventilation fan with a range hood) according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a control system of the ventilation fan of FIG. 1;

FIG. 3 shows the range hood of the embodiment shown in FIGS. 1 and 2;
It is a flowchart which shows the control operation of the ventilation fan with a do.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Ventilation fan with range hood 3 Range hood 5 Intake port 7 Oil filter 8 Exhaust flow path 9 Operation panel 11 Control unit 13 Exhaust fan 15 Exhaust port 17 Exhaust duct 21 Temperature sensor 23 Filter replacement sign lamp 25 Operation switch 25-1 Fan ON-OFF switch 25-2 Reset switch 31 Operating time integrating means 33 Oil filter cumulative use time calculating means 35 Comparison means

Continuation of the front page (56) References JP-A-4-354510 (JP, A) JP-A-3-99145 (JP, A) JP-A-5-1835 (JP, A) JP-A-2-48013 (JP) , A) (58) Field surveyed (Int.Cl. ⁷ , DB name) F24F ^7/ 04-7/06

Claims (1)

(57) [Claims] Claims 1. An exhaust fan for a kitchen, which discharges an atmosphere (cooking exhaust) containing oil smoke and steam generated in the kitchen, combustion exhaust gas from a cooking appliance, and the like; exhaust having an air inlet opening into the kitchen. A flow path, an exhaust fan that sucks and discharges exhaust gas into the exhaust flow path, an oil filter provided at an intake port of the exhaust flow path to capture oil smoke and the like in the exhaust flow, and an intake port of the exhaust flow path An exhaust temperature sensor for detecting the exhaust temperature of the section, a fan operating time after replacement or cleaning of the oil filter, a time when the exhaust temperature exceeds a predetermined value (classified temperature) (high-temperature operating time _TH ), An operating time integrating means for integrating the time when the exhaust gas temperature is equal to or lower than a predetermined value (low-temperature operating time _TL ); and a high-temperature operating time for weighting the cumulative operating time (T _T ) of the oil filter. Calculated oil filter And product use time calculating means, comparing means for comparing the use limit time set in advance and the oil filter cumulative operating time, the oil filter cumulative operating time exceeds a predetermined value (used limit time)
Notifying means for notifying a user of the fact when the number exceeds the threshold value, and a ventilation fan for a kitchen.