JP6566845B2 - Range food - Google Patents

Description

  The present invention relates to a range hood having no filter.

  In the range hood that is installed around the cooking device and sucks oil smoke and water vapor generated by cooking with the suction force of the built-in fan, the oil and fat that could not be separated by the filter reaches the inside of the fan, Furthermore, it will be separated. Therefore, as a method of efficiently separating oil and fat from the oil smoke sucked by the fan, a method of separating the oil by providing an uneven surface on the inner surface of the fan casing has been proposed (for example, Patent Document 1).

JP 2000-097466 A

However, the range hood disclosed in Patent Document 1 efficiently collects oil and fat by colliding with an uneven surface by rotation of the fan. For example, when the rotation speed of the fan is low, such as in the case of a low air flow, There was a problem that the collection rate of fats and oils decreased.
Therefore, the present invention proposes a range hood that changes the amount of air sucked by the range hood and does not decrease the oil and fat collection rate even when the amount of air is small.

In order to solve the above problems, an impeller having a plurality of blades that generate an air flow, a fan casing having the impeller inside, an electric motor that applies a rotational force to the impeller, and rotation of the electric motor A rotation control unit for controlling, an air volume regulating unit that exists on the flow path of the air flow and regulates the air volume, an air volume control unit that controls the air volume that the air volume regulating unit passes, and an air volume A storage unit for preliminarily storing a relationship between an air volume designating unit to be designated, a designated air volume designated by the air volume designating unit, and a target armature current of the motor corresponding to the rotation speed of the motor set in advance for each designated air volume; A detection unit that detects an armature current of the motor, and the rotation control unit controls the rotation speed of the motor to be kept constant at a preset rotation speed for each designated air volume, and an air volume control unit Is Range hood for controlling the amount of air amount designating unit designates as the air volume regulating portion passes is provided.
According to this, the range hood which does not reduce the collection rate of fats and oils can be provided even when the air volume is small.

Further, when the air volume designating unit designates the designated air volume, the air volume control unit detects the designated air volume stored in the storage unit and the target armature current corresponding to the rotation speed of the motor set in advance for each designated air volume, and detection If the armature current detected by the detection unit is smaller than the target armature current corresponding to the specified airflow, the airflow control unit When the armature current detected by the detection unit is larger than the target armature current corresponding to the specified airflow, the airflow control unit controls the airflow control unit so that the pressure of the airflow passage is controlled. Control may be performed to increase the loss.
According to this, the pressure loss of the air flow path is controlled so that the detected armature current becomes equal to the target armature current corresponding to the designated air volume and the rotation speed of the motor set in advance for each designated air volume. Thus, it is possible to provide a range hood that does not reduce the oil and fat collection rate even if the air volume is changed.

  As described above, according to the present invention, it is possible to provide a range hood that does not reduce the collection rate of oil and fat even when the amount of air sucked by the range hood is changed and the amount of air is small.

Sectional drawing in the front-back direction cross section of the range hood of 1st Example which concerns on this invention. The functional block diagram in the range hood of the 1st Example which concerns on this invention. The flowchart in the range hood of the 1st Example which concerns on this invention.

<First Example>
Embodiments according to the present invention will be described below with reference to the drawings. With reference to FIG. 1, the range hood 1 concerning a present Example is demonstrated. The range hood 1 has a thin hood portion 2 having a concave inner surface panel 5 on the inner surface for collecting steam, oily smoke and the like generated by cooking performed below or around. The hood portion 2 is connected to a blower box 3 connected to an exhaust duct (not shown) via an exhaust port 8 in the vicinity of the communication port 6 located on the upper rear side. The blower box 3 is a sirocco fan that is detachably coupled to the rotating shaft 21 of the electric motor 20 and is driven to rotate. The fan wheel 9 that generates the air flow AR, and the fan casing 9 that has the blade wheel 4 inside. Is provided. Therefore, when the impeller 4 operates, the communication port 6 becomes negative pressure, and the air below the inner surface panel 5 is sucked through the communication port 6 and discharged to the outside through the exhaust port 8. The fan casing 9 has a plurality of concave and convex surfaces 91 for causing oil and fat to collide with the inner surface thereof. The range hood 1 includes a rectifying plate 7 that is detachable from the hood 2 below the hood 2 and has a gap between the hood 2 and increases suction power.

  The air below the inner panel 5 contains steam, oily smoke, etc. generated by cooking. When the impeller 4 is operated, a gap between the inner panel 5 and the current plate 7 is formed as shown in the air flow AR shown in the figure. Then, it is guided to the bell mouth 90 and reaches the communication port 6. The air containing the fats and oils reaching the communication port 6 is sucked from the inside of the impeller 4 and blown out toward the outside. In this process, part of the oil and fat contained in the air comes into contact with the impeller 4 and adheres to the impeller 4. Then, the oil and fat adhering to the impeller 4 is blown toward the inner surface of the casing 9 by the rotation of the impeller 4. In that case, since the several uneven surface 91 exists in the inner surface of the fan casing 9, the fats and oils collide and adhere to the uneven surface 91. FIG. The range hood 1 separates the oil and fat from the air flow AR by attaching the oil and fat to the uneven surface 91 on the inner surface of the fan casing 9 in this way. If the rotational speed of the impeller 4 is slow, the oil / fat content contained in the air decreases in proportion to contact with the impeller 4, so that the oil / fat collection rate of the range hood 1 is reduced.

  The range hood 1 is provided on the air flow path and inside the exhaust port 8 on the downstream side of the impeller 4 and includes an air volume regulating unit 30 (damper) that regulates the air volume. The air volume regulating unit 30 changes the flow cross section of the exhaust port 8 by opening and closing in order to change the air volume of the air flowing inside the exhaust port 8. In the present embodiment, since the air flow restriction unit 30 is configured by a damper, when the flow rate cross section is increased, the damper is in a direction parallel to the air flow direction, and when the flow cross section is decreased, The damper is in a direction perpendicular to the direction of air flow. The air flow restriction unit 30 decreases the pressure loss of the air flow passage when the flow cross section is increased, and increases the pressure loss of the air flow passage when the flow cross section is reduced. The air volume regulating unit 30 is driven to open and close by a damper motor (not shown).

  The range hood 1 is provided on the front surface of the hood portion 2 with an on / off switch for operating / stopping the range hood 1 operated by the user, and an air volume designating unit 40 (air volume switching) for designating the air volume of air. Switch). The user operates the air volume designating unit 40 to designate the amount of air per unit time taken through the communication port 6. For example, the air volume designating unit 40 has three types of switches, strong, medium, and weak, and when the user operates the weak switch, the air volume regulating unit 30 draws the smallest air volume. Reduce flow cross-section to increase loss.

  In addition, the range hood 1 has a rotation control unit 50 that controls the rotation of the electric motor 20 inside the front side of the hood unit 2, and an air volume control unit 51 that controls the air volume of the air that the air volume regulation unit 30 passes. The storage unit 52 that stores in advance the relationship between the air volume and the target armature current of the motor 20 corresponding to the rotation speed of the motor 20 set in advance for each designated air volume, and the rotation speed and armature current of the motor 20 are detected. And a detecting unit 53 for performing the above. The rotation control unit 50 controls the rotation speed of the electric motor 20 that rotationally drives the impeller 4 so as to rotate at such a high speed that a large air volume can be realized. For example, in general range hoods, it is possible to specify an air volume that can be specified by the user, such as strong, medium, and weak, but a rotation speed corresponding to the strongest air volume is preferred. Thus, although the rotation speed of the electric motor 20 may be constant with respect to all the designated airflows, the rotation speed of the electric motor 20 may be preset for each designated airflow. In that case, it is preferable to set the rotational speed of the electric motor 20 when the designated air volume is small to be lower than the rotational speed of the electric motor 20 when the designated air volume is large. This is because when the designated air volume is small, the surface wind speed passing through the impeller 4 is slower, and the rotational speed required to obtain the same oil collection rate may be relatively slow. This is because there is an advantage that the noise accompanying rotation can be reduced.

  The storage unit 52 has a high rotational speed (target rotational speed N) sufficient to realize the large air volume, a designated air volume designated by the air quantity designating unit 40, and a current flowing through the armature of the motor 20 corresponding to the designated air quantity. The relationship with the target armature current as a target value is stored. The method of storage may be in the form of a function and may be obtained by calculation when a specified air volume is given, or the specified air volume and the target armature current may be provided one-on-one like a table. As will be described later, the air volume control unit 51 drives the damper motor based on the target armature current corresponding to the designated air volume, and controls the degree of opening and closing, that is, the pressure loss of the flow path. The rotation control unit 50, the air volume control unit 51, and the storage unit 52 are configured by a so-called microcomputer. The detection unit 53 includes a sensor that detects the rotation speed and armature current of the electric motor 20 at a certain point in time, and sends the detected information to the air volume control unit 51 and the rotation control unit 50.

  With reference to FIG. 2, the relationship between the rotation control unit 50 and the air volume regulating unit 51 will be described. The rotation control unit 50 compares the target rotation speed N of the electric motor 20 stored in the storage unit 52 with the rotation speed Nt of the electric motor 20 detected by the detection unit 53, and determines whether the electric motor 20 On the other hand, a voltage Δv to be increased or decreased is given to control the rotational speed of the electric motor 20. The electric motor 20 controlled in this way provides the same driving force to the impeller 4.

Air volume control unit 51 is stored in the storage unit 52, the target armature current I _Q corresponding to the designated air amount Q air volume designating section 40 (air flow rate selector switch) is specified, the detection unit 53 electric motor 20 detected armature Compared with the current It, the magnitude of the magnitude and the difference between them give the motor 31 that drives the air volume regulating unit 30 (damper) an angle Δθ that should be increased or decreased to control the degree of opening and closing of the motor 31. . The damper motor 31 controlled in this way provides a driving force to the air volume regulating unit 30 (damper).

  With reference to FIG. 3, the control method of the range hood 1 is demonstrated. It is assumed that the user of the range hood 1 operates the on / off switch to bring the range hood 1 into an operating state, and operates the air volume designating unit 40 (air volume changeover switch) to specify the air volume Q. The range hood 1 starts operation by rotating the electric motor 20 in S100. Although the rotation speed of the electric motor 20 gradually increases, the detection unit 53 detects the rotation speed Nt of the electric motor 20 and transmits it to the rotation control unit 50 and the like in S102. In S104, the rotation control unit 50 compares the rotation speed Nt detected by the detection unit 53 with the target rotation speed N. As a result, when the rotation speed Nt of the electric motor 20 is lower than the target rotation speed N, the rotation control unit 50 increases the rotation speed of the electric motor 20 (increases the voltage applied to the electric motor 20) in S112. ). Conversely, when the rotational speed Nt of the electric motor 20 exceeds the target rotational speed N, the rotation control unit 50 decreases the rotational speed of the electric motor 20 in S110.

  Thereafter, in S102, the detection unit 53 detects the rotation speed Nt of the electric motor 20, and sends it to the rotation control unit 50 or the like. In this repetition, when the rotation speed Nt measured by the detection unit 53 becomes equal to the target rotation speed N, the detection unit 53 detects the armature current It of the electric motor 20 in S106 and sends it to the air volume control unit 51 and the like. Send.

In S108, the air volume control unit 51 determines the armature current It measured by the detection unit 53, the air volume Q specified by the user, and the target armature current corresponding to the rotation speed of the motor 20 preset for each specified air volume. It is compared with the I _Q. Incidentally, the air volume control unit 51 is the target armature current I _Q stored in the storage unit 52 reads out in advance. As a result, when the armature current It of the motor 20 is below the target armature current I _Q corresponding to the rotational speed of the air flow Q and the motor 20 which is previously set for each specified air volume, air volume control unit 51 In S116, control is performed so as to further widen the opening / closing degree of the air volume regulating unit 30 (damper), that is, to reduce the pressure loss of the air flow path. Conversely, when the armature current It of the motor 20, exceeds the target armature current I _Q corresponding to the rotational speed of the air flow Q and the motor 20 which is previously set for each specified air volume, air volume control unit 51 In S114, control is performed so that the degree of opening and closing of the air volume regulating unit 30 (damper) is made narrower, that is, the pressure loss of the air flow path is increased.

  As described above, the rotation control unit 50 maintains the rotation speed Nt of the electric motor 20 constant (N), and the air volume control unit 51 uses the air volume regulation unit 30 to determine the air volume Q of the air specified by the air volume specification unit 40. Control to pass. In this way, the air volume regulating unit 30 can change the air volume sucked by the range hood 1 by regulating the air volume, and the rotation speed of the electric motor 20 can be achieved even when the air volume sucked by the range hood 1 is small. By maintaining the target rotational speed N, which is a high rotational speed, the range hood 1 can be provided in which the oil and fat content collides with the inner surface of the fan casing 9 and the oil and fat content collection rate does not decrease. Note that making the rotation speed Nt of the electric motor 20 constant includes changing the rotation speed Nt to some extent in order to match the rotation speed Nt with the target rotation speed N.

More specifically, when the air volume designating unit 40 designates the designated air volume Q, the air volume control unit 51 corresponds to the designated air volume Q stored in the storage unit 52 and the rotation speed of the motor 20 set in advance for each designated air volume. and the target armature current I _Q to compare the armature current it detector 52 detects the armature current it, when the target armature current I _Q smaller, air volume control unit 51, the air volume regulating portion 30 Control to reduce the pressure loss in the air flow path. Further, the armature current It detector 53 has detected is greater than the target armature current I _Q, air volume control unit 51, controlled to the air volume regulating unit 30 increases the pressure loss of the flow path of the air flow To do. In this way, to control the pressure loss of the flow path of the air flow to be equal to the corresponding target armature current I _Q in the specified air volume Q of the detected armature current It, be changed air volume A range hood that does not reduce the collection rate can be provided.

  In addition, this invention is not limited to the illustrated Example, The implementation by the structure of the range which does not deviate from the content described in each item of a claim is possible. That is, although the present invention has been particularly illustrated and described with respect to particular embodiments, it should be understood that the present invention has been described in terms of quantity, quantity, and amount without departing from the scope and spirit of the present invention. Various modifications can be made by those skilled in the art in application examples and other detailed configurations.

DESCRIPTION OF SYMBOLS 1 Range hood 2 Hood part 3 Blower box 4 Impeller 5 Inner panel 6 Communication port 7 Current plate 8 Exhaust port 9 Fan casing 20 Electric motor 21 Rotating shaft 30 Air volume control part (damper)
31 Motor for damper 40 Air volume specification part (Air volume switch)
DESCRIPTION OF SYMBOLS 50 Rotation control part 51 Air volume control part 52 Memory | storage part 53 Detection part 90 Bell mouth 91 Uneven surface AR Flow of air

Claims (2)

An impeller having a plurality of blades for generating a flow of air;
A fan casing having the impeller inside;
An electric motor for applying a rotational force to the impeller;
A rotation control unit for controlling rotation of the electric motor;
An air volume regulating unit that exists on the flow path of the air flow and regulates the air volume of the air;
An air volume control unit for controlling the air volume of air passing through the air volume regulating unit;
An air volume designating unit for designating an air volume of the air;
A storage unit for preliminarily storing a relationship between a specified air volume specified by the air volume specifying unit and a target armature current of the motor corresponding to a rotation speed of the motor set in advance for each specified air volume;
A detector for detecting an armature current of the motor;
With
The rotation control unit controls the rotation speed of the electric motor to be kept constant at a rotation speed set in advance for each designated air volume, and the air volume control unit controls the air flow designated by the air volume designating unit. Controlling the air volume to pass through by the air volume regulating unit;
Range food. When the air volume designating unit designates the designated air volume, the air volume control unit is configured to store the designated air volume stored in the storage unit and the target armature corresponding to the rotation speed of the motor set in advance for each designated air volume. Compare the current and the armature current detected by the detection unit,
When the armature current detected by the detection unit is smaller than the target armature current corresponding to the designated air volume, the air volume control unit reduces the pressure loss of the air flow passage by the air volume control unit. To control and
When the armature current detected by the detection unit is larger than the target armature current corresponding to the designated air volume, the air volume control unit increases the pressure loss of the air flow passage by the air volume control unit. To control,
The range hood according to claim 1.