JPH05322242A - Air supplying and discharging method and device for kitchen room - Google Patents

Abstract

PURPOSE:To reduce air-conditioning load, prevent the cold feeling of feet as well as the easy cooling of cooked food without increasing heating load and reduce the electric power consumption of an air supplying fan by a method wherein the opening degrees of dampers for respective branch ducts are controlled based on an exhaust gas temperature in accordance with the amount of combustion gas while the number of rotation of the air supplying fan is controlled in accordance with the amount of total combustion gas. CONSTITUTION:In an air supplying and discharging device, in which respective hoods 3a-3c provided in a plurality of cooking instruments 2a-2c in a kitchen room are connected to an exhaust duct 4 through branch ducts 5a-5c, an air supplying fan 8 is constituted so as to be capable of controlling the number of rotation of the same, respective branch ducts 5a-5c are provided with dampers 14a-14c, capable of being controlled through remote control, and exhaust gas temperature sensors 17a-17c are provided in respective branch ducts 5a-5c or hoods 3a-3c. The opening degrees of dampers 14a-14c of respective branch ducts 5a-5c are controlled based on detected exhaust gas temperatures in accordance with the amount of combustion gas of cooking instruments 2a-2c in respective air discharging divisions while the number of rotation of the air supplying fan 8 is controlled in accordance with the total sum of the amount of whole combustion gas of respective cooking instruments 2a-2c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for supplying / exhausting a kitchen room.

[0002]

2. Description of the Related Art Combustion exhaust gas and cooking exhaust gas discharged from cooking equipment in a kitchen room, particularly in a commercial kitchen room such as a restaurant or hotel, are installed above the cooking equipment by operating an exhaust fan. It is collected by the hood and is collected in an exhaust duct to be discharged outdoors. And at the same time,
Outside air is supplied by an air supply fan or air-conditioned air in an adjacent room is supplied through an air supply duct or the like into the kitchen room.

FIG. 4 shows a conventional example of such an air supply / exhaust system. In the figure, reference numeral 1 indicates a kitchen room, and the kitchen room 1 has a plurality of cooking appliances 2a, 2a.
b, 2c are installed and the hood 3a,
3b and 3c are provided. These hoods 3a, 3b,
3c is connected to the exhaust duct 4 via branch ducts 5a, 5b, 5c, and the exhaust duct 4 is provided with an exhaust fan 6. On the other hand, reference numeral 7 is an air supply duct, and an air supply fan 8 is provided in the air supply duct 7. The exhaust fan 6 and the air supply fan 8 are manually operated by the respective operation switches 9 and 10, and are always operated at a constant rotation speed during operation. In addition, the hood 3 is provided with a grease removing device 11 for removing oils and fats contained in the cooking exhaust as needed, and each branch duct 5a, 5b,
A fire damper 12 is provided at 5c so that it automatically closes in the event of a fire.

In the above structure, when the exhaust fan 6 and the air supply fan 8 are operated during the use of the cooking equipment, the amount of exhaust air is always constant regardless of the usage state of the cooking equipment 2a, 2b, 2c, for example, normally. The amount of exhaust gas is 20 to 40 times the theoretical combustion gas amount at the time of rated combustion of the entire cooking appliance. At the same time, the amount of air supplied in proportion to the amount of exhaust air is supplied through the air supply duct 7 and the like, and for this air supply, in addition to outside air, air-conditioned air in an adjacent room or the like is used.

[0005]

In a commercial kitchen room, the amount of combustion gas at the time of rated combustion of the entire cooking appliance is large, so the amount of exhaust gas and the amount of air supply set to 20 to 40 times that amount are also set. The amount of exhaust gas and the amount of supplied air are always constant regardless of the usage state of each cooking appliance. Therefore, when the cooking appliance is used on a low heat or the number of used appliances is small, the exhaust amount and the air supply amount more than necessary amount are performed at that time.

Therefore, there are the following problems. The air-conditioning load increases due to the air-conditioned air in the kitchen room or the adjacent room being discharged more than necessary. Especially in the winter, if a large amount of cold outside air is supplied to the kitchen as it is, the feet of the cook or the like will get cold, and the cooked food will easily cool.To solve this, heat the outside air. If the air is supplied, the heating load will increase. The amount of power consumed to operate the fan is large. The present invention aims to solve such conventional problems.

[0007]

In order to solve the above-mentioned problems, first, in the present invention, an exhaust duct provided with an exhaust fan and an air supply duct provided with an air supply fan are constructed, and
In the air supply / exhaust device having a structure in which each hood provided corresponding to each of a plurality of exhaust categories set for a plurality of cooking appliances in a kitchen room is connected to the exhaust duct through a branch duct, The fan is configured to be able to control the number of revolutions, and each of the branch ducts is provided with a remotely controllable damper, and an exhaust temperature sensor is provided in each of the branch ducts or the hood, and the exhaust temperature detected by the exhaust temperature sensor is adjusted. Based on the exhaust gas temperature, the opening degree of the damper of each branch duct is controlled in accordance with the combustion gas amount of the cooking appliance of each exhaust section having a corresponding relationship, and the total combustion is the sum of the combustion gas amount of each cooking appliance. A method of supplying and exhausting gas to and from a kitchen room is proposed, which controls the rotation speed of the air supply fan according to the amount of gas.

In the present invention, in addition to the exhaust temperature sensor of the above method, a room temperature sensor is provided in the kitchen room, and based on the temperature difference between the exhaust temperature detected by the exhaust temperature sensor and the room temperature detected by the room temperature sensor, The opening degree of the damper of each branch duct is controlled in accordance with the combustion gas amount of the cooking appliance of each exhaust classification that has a corresponding relationship with the temperature difference, and the total combustion gas amount that is the sum of the combustion gas amount of each cooking appliance. Accordingly, a method for supplying and exhausting gas to and from a kitchen room, which controls the rotation speed of the air supply fan, is proposed.

Further, in the above method, a method is proposed in which the opening of the damper of each branch duct is controlled so that the exhaust gas temperature or the temperature difference between the exhaust gas temperature and the room temperature becomes a set value.

Further, according to the present invention, as an apparatus to which the above method is applied, an exhaust duct provided with an exhaust fan and an air supply duct provided with an air supply fan are configured, and are set for a plurality of cooking appliances in a kitchen room. In the air supply / exhaust device having a structure in which each hood provided corresponding to each of the plurality of exhaust sections is connected to the exhaust duct via a branch duct, the air supply fan is configured to be controllable in rotation speed. A damper that can be operated remotely is provided in each branch duct, and an exhaust temperature sensor is provided in each branch duct or hood, and the opening degree of the damper and the exhaust fan are based on the exhaust temperature detected by the exhaust temperature sensor. And a supply / exhaust device for a kitchen room, which is provided with a control means for controlling the rotation speed of the supply fan.

In the present invention, in addition to the exhaust temperature sensor of the above apparatus, a room temperature sensor is provided in the kitchen room, and based on the temperature difference between the exhaust temperature detected by the exhaust temperature sensor and the room temperature detected by the room temperature sensor. A supply / exhaust device for a kitchen room is proposed, which is provided with control means for controlling the opening degree of the damper and the rotation speed of the supply fan.

Further, in the above method or apparatus, it is preferable that the air supply fan is constructed so that the rotation speed can be controlled by an inverter.

[0013]

When the amount of exhaust gas through the hood is constant, the exhaust gas temperature changes according to the amount of combustion gas of the cooking appliance, and under this condition, there is a one-to-one correspondence relationship between the exhaust gas temperature and the amount of combustion gas. When the room temperature is constant, there is a one-to-one correspondence between the temperature difference between the exhaust gas temperature and the room temperature and the combustion gas amount.
On the other hand, even when the combustion gas amount of the cooking appliance is constant, the exhaust gas temperature changes when the exhaust gas amount through the hood changes. Under this condition, the exhaust gas amount and the exhaust gas temperature have a one-to-one correspondence.

Therefore, by detecting the exhaust gas temperature or the temperature difference between the exhaust gas temperature and the room temperature, it is possible to detect the amount of exhaust gas with respect to the actual combustion gas amount of the cooking appliance. Therefore, by controlling the opening of the damper of each branch duct so that the exhaust temperature detected by the exhaust temperature sensor becomes constant, the opening of each damper is appropriately adjusted according to the combustion gas amount of each cooking appliance. be able to.

On the other hand, since the exhaust amount as a whole is the sum of the exhaust amounts passed through the dampers, at the same time as the above-mentioned adjustment of the opening amount of each damper, at the same time as the sum of the exhaust amounts corresponding to the respective opening amounts. By adjusting the rotation speed of the air supply fan so as to obtain a large amount of air supply, the exhaust gas amount and the air supply amount can be appropriately adjusted according to the combustion gas amount of the entire cooking appliance.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the structure of an embodiment of the present invention will be described with reference to FIG. The same components as those in FIG. 2 are designated by the same reference numerals. That is, in FIG.
Reference numeral 1 indicates a kitchen room, and a plurality of cooking appliances 2a, 2b, 2c are installed in the kitchen room 1, and foods 3a, 3b, 3c are provided above the cooking equipments 2a, 3b, 3c, respectively. , 3b, 3c are exhaust categories. That is, in this embodiment, the exhaust classification is for each cooking appliance 2
It is configured for each of a, 2b, and 2c. In addition, the exhaust section can be configured such that a plurality of cooking appliances belong to one exhaust section. Each hood 3 for each exhaust category
a, 3b, 3c are the exhaust duct 4 and the branch ducts 5a, 5b,
5c, and the exhaust duct 4 is provided with an exhaust fan 6. On the other hand, reference numeral 7 is an air supply duct,
An air supply fan 8 is provided in the air supply duct 7. The air supply fan 8 is configured to be driven by an inverter 13 so that the rotation speed can be controlled. The branch ducts 5a, 5b, 5
The dampers 14a, 14b and 14c are provided on the respective c, and these dampers 14a, 14b and 14c are used for the motor 1
The drive by 5a, 15b, and 15c is configured to be remotely operable. These motors 15a, 15b, 15c
The inverter 13 and the inverter 13 are controlled by the control means 16.

Exhaust gas temperature sensors 17a, 17b, 17c are installed in the branch ducts 5a, 5b, 5c, respectively, and in the kitchen room 1, there is an influence from the cooking appliances 2a, 2b, 2c. The room temperature sensor 18 is installed in a non-existing position. The temperature signals from these sensors are sent to the control means 1
I am typing in 6. In the figure, reference numeral 19 is a fuel gas supply pipe, 20 is a wall, and 21 is a ceiling.

FIG. 2 illustrates a specific example of the correspondence relationship between the exhaust gas temperature and the amount of combustion gas from the cooking device when the amount of exhaust gas is constant. The amount of combustion is plotted on the horizontal axis, and the exhaust temperature is plotted on the vertical axis. In this example, the exhaust gas volume at room temperature of 20 ° C is 40 times (40%) of the theoretical combustion gas volume at the rated combustion of the cooking appliance.
kQ = 1040 m ³ / h).

As shown in this figure, the combustion amount is 0 (kcal /
In the case of h), the exhaust temperature, which is equal to room temperature, naturally increases monotonically as the combustion amount increases, so that it can be seen that the exhaust temperature, the combustion amount, and the combustion gas amount have a one-to-one correspondence. It can be seen that the temperature difference between the exhaust temperature and the room temperature (20 ° C) also has a one-to-one correspondence with the combustion amount and the combustion gas amount.

Next, FIG. 3 illustrates the correspondence relationship between the exhaust temperature and the combustion gas amount, like FIG. 2, and the exhaust amount is shown as a parameter in this figure. In addition, in this figure, the combustion amount on the horizontal axis is shown as a ratio with the rated combustion amount as 100%, and the exhaust gas temperature on the vertical axis is the rated combustion amount when the above-mentioned predetermined exhaust amount (40 kQ) is secured. Exhaust temperature 100%
It is shown by the ratio. Therefore, the relationship between the exhaust gas temperature, the combustion gas amount, and the exhaust gas amount will be described below with reference to FIG.

First, in a state in which the cooking appliance is burning at the rated combustion amount (100%) and the above-mentioned predetermined exhaust amount (40 kQ) is secured, that is, in the state of point a in the figure, the exhaust temperature is set to a predetermined value. Maintained at temperature (100%).

In such a state, when the exhaust amount does not change and only the combustion amount decreases, the exhaust state shifts along the equal exhaust amount line of 40 kQ and the exhaust temperature at the point b where the combustion amount becomes 61%. It falls to 78%, and the displacement becomes excessive. Therefore, when the exhaust volume is decreased, the exhaust temperature gradually rises, and when the exhaust volume is reduced to 28 kQ as shown at point c, the exhaust temperature becomes 10%.
It returns to 0%, that is, the exhaust amount is reduced to an appropriate amount corresponding to the combustion amount. Next, when only the combustion amount further decreases from the state at the point c, the exhaust state shifts from the point c to the point d, and then the exhaust amount is reduced to shift from the point d to the point e.

Next, the state at point e (combustion amount 43%, displacement 20 k
If only the combustion amount increases from Q), the exhaust state shifts along the equal displacement line of 20 kQ, and at the point f where the combustion amount becomes 91%, the exhaust temperature rises to 128% and the exhaust amount becomes too small. .. Therefore, if the displacement is increased to 35 kQ, the exhaust temperature becomes 100
%, The exhaust amount becomes an appropriate amount again corresponding to the combustion amount.

In the above description, the amount of exhaust gas is detected by detecting the exhaust gas temperature and comparing it with a predetermined set value. However, the temperature difference between the exhaust gas temperature and room temperature is compared with the set value and the exhaust gas is exhausted. It is also possible to detect the quantity. In the former method, when the room temperature changes, the correspondence relationship between the exhaust temperature and the combustion gas amount shifts, which causes an error, but in the latter case, an accurate correspondence relationship can be obtained regardless of the room temperature change. ..

Thus, the control means 16 detects the exhaust gas temperature or the temperature difference between the exhaust gas temperature and the room temperature as described above, and compares the detected exhaust gas temperature with the respective predetermined set values, whereby each cooking appliance 2
Each hood 3 for the actual combustion gas amount of a, 2b, 2c
The damper 14 of each branch duct 5a, 5b, 5c can be detected so that the amount of exhaust gas for each a, 3b, 3c can be detected, and therefore the exhaust gas temperature or the temperature difference becomes a set value.
By controlling the opening degrees of the a, 14b, and 14c, the opening degrees of the dampers 14a, 14b, and 14c are changed to the cooking appliances 2a,
It can be appropriately adjusted according to the combustion gas amounts of 2b and 2c. That is, the opening degree of the damper corresponding to the cooking appliance with a large combustion gas amount is set to a large value, and conversely, the opening degree of the damper corresponding to the cooking appliance with a small combustion gas amount or being stopped is reduced or closed. ..

On the other hand, the displacement of the damper 1 as a whole is
Since it is the sum of the displacements after passing through 4a, 14b, and 14c,
The control means 16 includes the dampers 14a, 14b, 1 described above.
At the same time as adjusting the opening degree of 4c, the total exhaust amount of the exhaust amounts corresponding to the respective opening degrees is calculated, and the rotation speed of the air supply fan 8 is adjusted in accordance with this exhaust amount, thereby preparing the cooking appliance. It is possible to appropriately adjust the exhaust gas amount and the air supply amount in accordance with the total combustion gas amount. For example, the amount of exhaust gas and the amount of supplied air are about 20 to 40 times the amount of combustion gas of the entire cooking appliance.

As described above, since the rotation speed of the air supply fan 8 is set momentarily based on the actual total combustion gas amount, the exhaust gas amount and the air supply amount are constantly set to the minimum necessary amount according to the total combustion gas amount. Can be set to. And each hood 3a, 3
Since the openings of the dampers 14a, 14b, 14c of b, 3c are set according to the combustion gas amount of the corresponding cooking appliances 2a, 2b, 2c, the exhaust gas is exhausted from the hoods 3a, 3b, 3c at an appropriate ratio. It can be carried out.

[0028]

As described above, according to the present invention, the opening degree of the damper corresponding to each hood is set according to the actual combustion gas amount of each cooking appliance, and the rotation speed of the air supply fan in the air supply duct is set. Since it is set in accordance with the total combustion gas amount, the exhaust gas amount and the air supply amount can be set to the necessary minimum.

Therefore, the following energy saving effect and environmental improvement effect can be obtained. Air-conditioned air in the kitchen room, the adjacent room, or the like is not exhausted more than necessary, so that the air-conditioning load can be reduced. Even in the winter, without increasing the heating load,
It is possible to prevent inconveniences such as the feet of a cook or the like becoming cold or the cooked product easily cooled. It is possible to reduce the amount of power consumed to operate the air supply fan.

[Brief description of drawings]

FIG. 1 is a system explanatory view showing an example of an air supply / exhaust system to which the present invention is applied.

FIG. 2 is an explanatory diagram showing a specific example of the correspondence relationship between the exhaust temperature and the combustion gas amount when the exhaust amount is constant.

FIG. 3 is an explanatory diagram showing a specific example of the correspondence relationship between exhaust gas temperature and combustion gas amount, using the exhaust gas amount as a parameter.

FIG. 4 is a system explanatory view showing an example of a conventional air supply / exhaust system.

[Explanation of symbols]

 1 Kitchen room 2a, 2b, 2c Cooking equipment 3a, 3b, 3c Hood 4 Exhaust duct 5a, 5b, 5c Branch duct 6 Exhaust fan 7 Air supply duct 8 Air supply fan 9 Operation switch 10 Operation switch 11 Grease removal device 12 Fire prevention damper 13 Inverters 14a, 14b, 14c Remotely controllable dampers 15a, 15b, 15c Motor 16 Control means 17a, 17b, 17c Exhaust temperature sensor 18 Room temperature sensor 19 Fuel gas supply pipe 20 Wall 21 Ceiling

Claims (7)

[Claims] 1. An exhaust duct provided with an exhaust fan and an air supply duct provided with an air supply fan are provided, and provided corresponding to each of a plurality of exhaust sections set for a plurality of cooking appliances in a kitchen room. In the air supply / exhaust device in which each hood is connected to the exhaust duct via the branch duct, the air supply fan is configured to be capable of controlling the rotation speed, and a damper that can be remotely operated is provided to each of the branch ducts. An exhaust gas temperature sensor is provided in each of the branch ducts or the hood, and the exhaust gas temperature detected by the exhaust gas temperature sensor is used to correspond to the combustion gas amount of the cooking appliance of each exhaust gas section having a corresponding relationship with the exhaust gas temperature. Control the damper opening of each branch duct,
A method for supplying and exhausting gas to and from a kitchen room, wherein the number of revolutions of the air supply fan is controlled in accordance with the total combustion gas amount, which is the sum of the combustion gas amounts of the cooking appliances 2. The air supply / exhaust method according to claim 1, wherein the opening of the damper of each branch duct is controlled so that the exhaust temperature becomes a set value. 3. An exhaust duct provided with an exhaust fan and an air supply duct provided with an air supply fan are provided, and provided corresponding to each of a plurality of exhaust sections set for a plurality of cooking appliances in a kitchen room. In the air supply / exhaust device in which each hood is connected to the exhaust duct via a branch duct, the supply fan is configured to be capable of controlling the rotation speed, and a damper that can be remotely operated to each of the branch ducts. The exhaust temperature sensor is provided in each of the branch ducts or the hood, and the room temperature sensor is provided in the kitchen room. Based on the temperature difference between the exhaust temperature detected by the exhaust temperature sensor and the room temperature detected by the room temperature sensor. , The opening of the damper of each branch duct is controlled in accordance with the combustion gas amount of the cooking appliance of each exhaust section having a corresponding relationship with the temperature difference, and is the total sum of the combustion gas amount of each cooking appliance. A method for supplying and exhausting gas to and from a kitchen room, wherein the rotation speed of the air supply fan is controlled according to the amount of combustion gas. 4. The method according to claim 3, wherein the opening of the damper of each branch duct is controlled so that the temperature difference between the exhaust temperature and the room temperature becomes a set value. Air supply / exhaust method 5. An exhaust duct provided with an exhaust fan and an air supply duct provided with an air supply fan are configured, and provided corresponding to each of a plurality of exhaust sections set for a plurality of cooking appliances in a kitchen room. In the air supply / exhaust device in which each hood is connected to the exhaust duct via the branch duct, the air supply fan is configured to be capable of controlling the rotation speed, and a damper that can be remotely operated is provided to each of the branch ducts. An exhaust gas temperature sensor is provided in each of the branch ducts or the hood, and control means is provided for controlling the opening degree of the damper and the rotation speed of the air supply fan based on the exhaust gas temperature detected by the exhaust gas temperature sensor. An air supply / exhaust device for a kitchen room characterized by 6. An exhaust duct provided with an exhaust fan and an air supply duct provided with an air supply fan are provided, and provided corresponding to each of a plurality of exhaust sections set for a plurality of cooking appliances in a kitchen room. In the air supply / exhaust device in which each hood is connected to the exhaust duct via a branch duct, the supply fan is configured to be capable of controlling the rotation speed, and a damper that can be remotely operated to each of the branch ducts. And an exhaust gas temperature sensor in each branch duct or hood, and a room temperature sensor in the kitchen room, based on the temperature difference between the exhaust gas temperature detected by the exhaust gas temperature sensor and the room temperature detected by the room temperature sensor. Control means for controlling the opening of the damper and the rotation speed of the air supply fan. 7. The air supply / exhaust device for a kitchen room according to claim 5, wherein the air supply fan is configured so that the rotation speed can be controlled by an inverter.