JP2019174053A - Kitchen ventilation unit and kitchen ventilation method - Google Patents

Abstract

To suppress fastening of an exhaust damper.SOLUTION: A kitchen ventilation unit comprises: an exhaust passage including an exhaust hood; an exhaust damper 122a provided in the exhaust passage; a target determination part 142 for determining a target flow quantity of a flow quantity of the exhaust hood; and a damper control part 146 for controlling the exhaust damper 122a to an opening to bring a flow quantity of the exhaust hood to the target flow quantity. Due to that the damper control part 146 executes fastening prevention control for controlling the exhaust damper 122a to an opening different form the target opening when becoming a predetermined trigger, the exhaust damper 122a is deviated so as to prevent fastening.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a kitchen ventilation unit and a kitchen ventilation method for ventilating a kitchen.

  Conventionally, kitchen ventilators provided with an exhaust hood and an exhaust fan have become widespread (for example, see Patent Document 1). Some exhaust hoods are provided with an exhaust damper and a flow rate sensor, and the exhaust damper is controlled so that the flow rate of the exhaust hood becomes a target flow rate according to the output of the flow rate sensor.

JP-A-2015-206508

  In a kitchen exhaust device as described in Patent Document 1, if the period during which the exhaust damper does not change is prolonged, the exhaust damper may be fixed due to oil contained in the exhaust.

  In view of such a problem, an object of the present invention is to provide a kitchen ventilation unit and a kitchen ventilation method capable of suppressing sticking of an exhaust damper.

  In order to solve the above problems, a kitchen ventilation unit according to the present invention includes an exhaust passage including an exhaust hood, an exhaust damper provided in the exhaust passage, a target determining unit that determines a target flow rate of the exhaust hood, A damper control unit that controls the exhaust damper at a target opening at which the flow rate of the hood becomes the target flow rate, and the damper control unit controls the exhaust damper to an opening different from the target opening when a predetermined trigger occurs. Carry out control.

  The sticking prevention control may include a process for fully opening the exhaust damper and a process for fully closing the exhaust damper.

  The sticking prevention control may include a process of returning to the target opening after exceeding the target opening when the exhaust damper is controlled to the target opening.

  The predetermined trigger may include that the opening degree of the exhaust damper does not change for the first predetermined period or longer.

  The predetermined trigger may include activation of the kitchen ventilation unit after the kitchen ventilation unit has been stopped for a second predetermined period or longer.

  In order to solve the above problems, the kitchen ventilation method of the present invention includes a step of determining a target flow rate of the exhaust hood included in the exhaust passage, and a target opening at which the flow rate of the exhaust hood becomes the target flow rate. And a step of performing sticking prevention control for controlling the exhaust damper to an opening different from the target opening when a predetermined trigger occurs.

  According to the present invention, it is possible to suppress sticking of the exhaust damper.

It is explanatory drawing which showed the schematic structure of the kitchen ventilation unit. It is the functional block diagram which showed the schematic structure of the damper control apparatus. It is a 1st flowchart which shows the flow of a kitchen ventilation process. It is a 2nd flowchart which shows the flow of a kitchen ventilation process.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is an explanatory diagram showing a schematic configuration of the kitchen ventilation unit 100. The kitchen ventilation unit 100 is provided in the kitchen 1. The kitchen 1 is provided with two cooking devices 2 and 3. Exhaust hoods 110a and 110b are disposed above the cooking appliances 2 and 3, respectively. An exhaust duct 112 communicates with the exhaust hoods 110a and 110b. The exhaust duct 112 branches into the branch paths 112b and 112c at the branch part 112a. The branch path 112b extends toward the exhaust hood 110a. The branch path 112c extends toward the exhaust hood 110b.

  Exhaust gas generated in the cooking appliances 2 and 3 flows into the exhaust duct 112 through the exhaust hoods 110a and 110b. The exhaust hoods 110a and 110b and the exhaust duct 112 constitute an exhaust passage 114 through which exhaust flows. An exhaust fan 116 is provided on the downstream side of the exhaust passage 114. The exhaust fan 116 is driven by, for example, an electric motor, and sends the exhaust in the exhaust passage 114 to the outdoors.

  An intake duct 118 communicates with the kitchen 1. An intake fan 120 is provided on the upstream side (outdoor side) of the intake duct 118. The intake fan 120 is driven by, for example, an electric motor, and sucks outdoor air into the intake duct 118 as intake air. The intake air flows into the kitchen 1 through the intake duct 118.

  The exhaust passage 114 is provided with exhaust dampers 122a and 122b for each of the exhaust hoods 110a and 110b. The exhaust damper 122 a is provided in the branch path 112 b of the exhaust duct 112. The exhaust damper 122 b is provided in the branch path 112 c of the exhaust duct 112. The exhaust dampers 122a and 122b are constituted by, for example, butterfly valves. The exhaust dampers 122a and 122b open and close the exhaust duct 112 (branch paths 112b and 112c) when the valve body is rotated by an electric motor. The opening degree of the exhaust dampers 122a and 122b can be adjusted linearly (linearly or continuously) according to the rotational position of the valve body.

  The flow velocity sensors 124a and 124b are arranged in the branch paths 112b and 112c, respectively. The flow velocity sensors 124a and 124b are differential pressure sensors such as an orifice type and a pitot tube type, for example. The flow velocity sensors 124a and 124b detect the flow velocity of the exhaust gas flowing through the branch paths 112b and 112c by converting the differential pressure. The exhaust hoods 110a and 110b are provided with temperature sensors 126a and 126b, respectively.

  The damper control devices 130a and 130b are provided for each of the exhaust dampers 122a and 122b. The damper control device 130a controls the opening degree of the exhaust damper 122a. The damper control device 130b controls the opening degree of the exhaust damper 122b. The damper control devices 130a and 130b determine the operating state of the cooking appliances 2 and 3 based on the output values of the temperature sensors 126a and 126b.

  FIG. 2 is a functional block diagram showing a schematic configuration of the damper control device 130a. The damper control device 130a and the damper control device 130b have substantially the same function. Here, in order to avoid duplication of explanation, the damper control device 130a will be described in detail, and the description of the damper control device 130b will be omitted.

  As shown in FIG. 2, the damper control device 130 a includes a communication unit 132 and a control unit 140. The communication unit 132 establishes communication with the center device 150 described later. This communication may be wired or wireless.

  The control unit 140 includes a CPU (Central Processing Unit) and a DSP (Digital Signal Processor), and controls the entire damper control device 130a in cooperation with a ROM storing a program and a RAM as a work area. The control unit 140 also functions as a target determination unit 142, a communication control unit 144, and a damper control unit 146.

  The target determination unit 142 specifies the operating state of the cooking appliance 2 based on the output of the temperature sensor 126a. And the target determination part 142 determines the target flow rate of exhaust flow according to the operating state of the cooking appliance 2. FIG. For example, the target flow rate is set to a predetermined value when the cooking device 2 is operating, and is set to 0 when the cooking device 2 is stopped. The target flow rate is set according to, for example, the types of cooking appliances 2 and 3.

  The communication control unit 144 transmits the operating state of the cooking appliances 2 and 3 and the target flow rate of the exhaust flow rate to the center device 150 via the communication unit 132.

  The center apparatus 150 acquires the operating state of the cooking appliances 2 and 3 and the target flow rate of the exhaust flow rate from the damper control devices 130a and 130b, respectively. The center device 150 controls the exhaust fan 116 based on the total target flow rate of the exhaust flow rates of the damper control devices 130a and 130b. In addition, the center device 150 controls the intake fan 120 so that the intake flow rate is smaller than the exhaust flow rate by a predetermined flow rate.

  Therefore, in the kitchen 1, a state in which the exhaust flow rate is larger than the intake flow rate is maintained. The air inside the kitchen 1 is difficult to leak from the kitchen 1 to the corridor, the adjacent room, etc., and the diffusion of odors and smoke generated by cooking in the kitchen 1 into the room is suppressed.

  The damper control unit 146 specifies the target opening degree of the exhaust damper 122a. The target opening is, for example, an opening estimated that the exhaust flow rate becomes the target flow rate. The damper control unit 146 controls the exhaust damper 122a to the target opening degree. When the cooking appliance 2 is stopped and the target flow rate is 0, the target opening is 0 (fully closed).

  Thereafter, the damper control unit 146 multiplies the flow rate indicated by the output value of the flow rate sensor 124a by the flow path cross-sectional area of the branch path 112b. Thus, the damper control unit 146 derives the exhaust flow rate of the branch path 112b.

  The damper control unit 146 corrects the target opening so that the exhaust flow rate derived from the output value of the flow velocity sensor 124a becomes the target flow rate. Thus, the damper control unit 146 controls the opening degree of the exhaust damper 122a (for example, feedback control).

  As described above, the damper control device 130a controls the opening degree of the exhaust damper 122a according to the output values of the flow velocity sensor 124a and the temperature sensor 126a. Similarly, the damper control device 130b controls the opening degree of the exhaust damper 122b according to the output values of the flow velocity sensor 124b and the temperature sensor 126b.

  By the way, for example, when cooking is performed in the kitchen 1 for a long time, the period during which the opening degree of the exhaust dampers 122a and 122b does not change may be prolonged. In this case, the exhaust dampers 122a and 122b may be fixed due to oil contained in the exhaust. Therefore, the damper control unit 146 performs sticking prevention control when a predetermined trigger occurs.

  The sticking prevention control is a process of changing the opening degree of the exhaust dampers 122a and 122b from the target opening degree. For example, the sticking prevention control includes a process of opening the exhaust dampers 122a and 122b to fully open (opening 100%) and a process of fully closing (opening 0). Hereinafter, these processes are collectively referred to as a fully opened / closed process.

  Further, in the sticking prevention control, when the exhaust dampers 122a and 122b are controlled (displaced) to the target opening, the opening is once greatly changed to a position exceeding the target opening, and then returned to the target opening again. Processing is included. Hereinafter, this processing is referred to as overshoot processing.

  Here, even if the change in the target flow rate is small, the target opening may change frequently according to the change in the target flow rate. When the target opening is changed, the damper controller 146 performs a correction to add or subtract, for example, 10 degrees to the changing target opening, thereby greatly changing the opening to a position exceeding the target opening. Thereafter, correction for canceling the correction is performed.

  The damper control unit 146 may perform only one of the fully open / close process and the overshoot process as the sticking prevention process. The damper control unit 146 may perform both the full open / close process and the overshoot process as the sticking prevention process.

  In this manner, when the damper control unit 146 has a predetermined trigger, it performs sticking prevention control for controlling the exhaust dampers 122a and 122b to have an opening different from the target opening. For this reason, the exhaust dampers 122a and 122b are displaced to prevent sticking.

  In addition, the sticking prevention control may include a reciprocating process in which the sticking prevention control is reciprocated by a predetermined angle toward the fully open side and the fully closed side. Here, the predetermined angle is set in advance. The sticking prevention control may include a process of changing the opening degree in any pattern other than the above.

  In any of the above-described sticking prevention controls, the opening change speed may be the same as the opening changing speed other than the sticking prevention control. The change rate of the opening may be faster or slower than the change rate of the opening when the control is other than the sticking prevention control.

  Further, the predetermined trigger includes that the opening degree of the exhaust dampers 122a and 122b does not change for a preset first predetermined period or longer. That is, the damper control unit 146 determines that the predetermined trigger has been reached when the exhaust dampers 122a and 122b are fully closed or the target opening remains at a value greater than 0 for a first predetermined period or more.

  Further, the predetermined trigger includes starting the kitchen ventilation unit 100 after having been stopped for a second predetermined period or longer. For example, when the kitchen ventilation unit 100 is started, the center device 150 transmits information indicating the time from the stop of the kitchen ventilation unit 100 to the restart (hereinafter referred to as stop period information) to the damper control devices 130a and 130b. The communication control unit 144 of the damper control devices 130 a and 130 b acquires the stop period information from the center device 150. The damper control unit 146 determines that a predetermined trigger has occurred when the stop period indicated by the stop period information is equal to or longer than the second predetermined period.

  Here, the case has been described in which the damper control unit 146 identifies the stop period based on the stop period information transmitted from the center device 150. However, if the damper control devices 130a and 130b themselves can specify the stop period, transmission of the stop period information from the center device 150 is not necessary.

  FIG. 3 is a first flowchart showing the flow of the kitchen ventilation process. The process shown in FIG. 3 is repeatedly executed at a predetermined cycle.

(S200)
The target determination unit 142 determines a target flow rate of the exhaust flow rate based on the outputs of the temperature sensors 126a and 126b.

(S202)
The damper control unit 146 specifies the target opening degree of the exhaust dampers 122a and 122b. When the exhaust dampers 122a and 122b are already opened, the damper control unit 146 specifies the corrected target opening based on the exhaust flow rate derived from the output values of the flow velocity sensors 124a and 124b.

(S204)
The damper control unit 146 determines whether or not the period during which the opening degree of the exhaust dampers 122a and 122b does not change is equal to or longer than the first predetermined period. For example, if the change width of the opening is within a preset allowable range, it is counted as a period during which the opening of the exhaust dampers 122a and 122b does not change. When the counter value for counting the period during which the opening does not change exceeds the first threshold, it is determined that the period during which the opening of the exhaust dampers 122a, 122b does not change is equal to or longer than the first predetermined period. If the period during which the opening degree of the exhaust dampers 122a and 122b does not change is equal to or longer than the first predetermined period, the process proceeds to S206. If the period during which the opening degree of the exhaust dampers 122a and 122b does not change is less than the first predetermined period, the process proceeds to S208.

(S206)
The damper control unit 146 performs sticking prevention control.

(S208)
The damper control unit 146 controls the exhaust dampers 122a and 122b so as to reach the target opening.

  FIG. 4 is a second flowchart showing the flow of the kitchen ventilation process. The process shown in FIG. 4 is executed when the kitchen ventilation unit 100 is activated. Here, processes substantially equivalent to the processes shown in FIG. 3 are denoted by the same reference numerals, and description thereof is omitted.

(S304)
The damper control unit 146 determines whether or not the stop period indicated by the stop period information acquired from the center device 150 is equal to or longer than the second predetermined period. If the stop period is equal to or longer than the second predetermined period, the process proceeds to S206. If the stop period is less than the second predetermined period, the process proceeds to S208. For example, a counter value for counting the stop period is provided, the kitchen ventilation unit 100 stops and starts counting, and the kitchen ventilation unit 100 is activated to reset the counter value. When the counter value is equal to or greater than the second threshold, it is determined that the stop period is equal to or greater than the second predetermined period.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  For example, a program that causes a computer to function as the center device 150 or the damper control devices 130a and 130b, or a computer-readable storage medium such as a flexible disk, a magneto-optical disk, a ROM, a CD, a DVD, or a BD that records the program Is also provided. Here, the program refers to data processing means described in an arbitrary language or description method.

  In the above-described embodiment, the case where a plurality of exhaust hoods 110a and 110b and exhaust dampers 122a and 122b are provided has been described. However, at least one of the exhaust hoods 110a and 110b and the exhaust dampers 122a and 122b may be provided.

  In the above-described embodiment, the case where the sticking prevention control includes the process of fully opening the exhaust dampers 122a and 122b and the process of fully closing the exhaust dampers 122a and 122b has been described. In this case, the change in opening is large, and the effect of preventing sticking is high. However, the sticking prevention control may not include the process of fully opening the exhaust dampers 122a and 122b and the process of fully closing.

  In the above-described embodiment, the case where the sticking prevention control includes the process of returning to the target opening after exceeding the target opening when the exhaust dampers 122a and 122b are controlled to the target opening has been described. In this case, the time required for the sticking prevention control is short, and the influence on the exhaust flow rate is suppressed.

  In the above-described embodiment, the case has been described in which the predetermined trigger includes that the opening degree of the exhaust dampers 122a and 122b does not change for the first predetermined period or longer. In the above-described embodiment, the case where the predetermined trigger includes starting the kitchen ventilation unit after being stopped for the second predetermined period or longer has been described. When the predetermined trigger includes these conditions, the sticking prevention control can be performed when the exhaust dampers 122a and 122b are easily stuck. However, the predetermined trigger may be other conditions as long as the exhaust dampers 122a and 122b are easily fixed.

  In addition, each process of the kitchen ventilation method of this specification does not necessarily need to process in time series along the order described as a flowchart, and may include the process by parallel or a subroutine.

  The present invention can be used for a kitchen ventilation unit and a kitchen ventilation method for ventilating a kitchen.

100 Kitchen ventilation unit 110a, 110b Exhaust hood 112 Exhaust duct 114 Exhaust passage 122a, 122b Exhaust damper 142 Target determination unit 146 Damper control unit

Claims (6)

An exhaust passage including an exhaust hood;
An exhaust damper provided in the exhaust passage;
A target determining unit for determining a target flow rate of the exhaust hood;
A damper control unit that controls the exhaust damper to a target opening at which the flow rate of the exhaust hood becomes the target flow rate,
The damper control unit is a kitchen ventilation unit that performs anti-sticking control for controlling the exhaust damper to an opening different from the target opening when a predetermined trigger occurs.   The kitchen ventilation unit according to claim 1, wherein the sticking prevention control includes a process for fully opening the exhaust damper and a process for fully closing the exhaust damper.   The kitchen ventilation unit according to claim 1, wherein the sticking prevention control includes a process of returning to the target opening after the target opening is exceeded when the exhaust damper is controlled to the target opening.   The kitchen ventilation unit according to any one of claims 1 to 3, wherein the predetermined trigger includes that the opening degree of the exhaust damper does not change for a first predetermined period or longer.   The kitchen ventilation unit according to any one of claims 1 to 4, wherein the predetermined opportunity includes activation of the kitchen ventilation unit after the kitchen ventilation unit has been stopped for a second predetermined period or longer. . Determining a target flow rate of the exhaust hood included in the exhaust passage;
Controlling an exhaust damper provided in the exhaust passage to a target opening at which the flow rate of the exhaust hood becomes the target flow rate;
Performing a sticking prevention control for controlling the exhaust damper to an opening different from the target opening when a predetermined trigger occurs;
A kitchen ventilation method.

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