JP2008119418A - Home electric appliance storage apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a home electric appliance storage apparatus by which a home electric appliance is operated kept in the storage apparatus and noise is reduced by varying air exhaust performance according to the amount of vapor of the home electric appliance in a cabinet. <P>SOLUTION: A home electric appliance storage portion 3 whose front surface is opened stores a home electric appliance 2 in a cabinet 1. The storage portion 3 includes an air exhaust device 6 that has an exhaust air path 10 leading from the home electric appliances storage portion 3 to the front side of the cabinet 1 and incorporating a fan 8. The fan 8 is controlled by a controller 15 and the amount of vapor from the home electric appliances 2 is detected by a temperature detecting means 13. The controller 15 drives the fan 8 at low revolutions when the temperature (vapor content) detected by the temperature detecting means 13 is higher than a first criterion. The controller 15 drives the fan 8 at high revolutions when the temperature is higher than a second criterion which is higher than the first criterion. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a home appliance storage that can be used in a state in which the home appliance is stored.

Conventionally, this type of household electrical appliance storage is provided with a household electrical appliance storage section that opens in the cabinet and stores household electrical appliances inside the cabinet, and is discharged from the household electrical appliance on the top surface of the household electrical appliance storage section. The exhaust device that discharges hot air / steam to the outside is provided, and the hot air / steam exhausted from the household electrical appliance is exhausted to the outside so that it can be used in a state in which the household electrical appliance is stored (for example, Patent Document 1).
Japanese Patent Publication No.7-111435

  In such a conventional configuration, when a household electrical appliance is stored and used in a cabinet, it is driven with a constant air volume regardless of the steam volume of the household electrical appliance. At this time, in order to discharge the steam without any problem when the steam amount is maximum, it is driven with the maximum discharge capacity. For this reason, when the amount of steam is small, there is no problem in discharging steam even if the exhaust capacity is lowered, but there is a problem that noise is high.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to reduce noise by varying the exhaust capacity in accordance with the amount of steam of household electrical appliances housed in a cabinet.

  In order to achieve the above-mentioned object, the present invention provides a household electrical appliance storage section in which a household electrical appliance is stored in a cabinet and the front surface is opened, and a discharge passage that incorporates a fan that communicates from the household electrical appliance storage section to the front of the cabinet. The apparatus is configured to control the operation of the fan by the control means, and to detect the amount of steam discharged from the home appliance by the steam amount detection means. The control means detects the steam detected by the steam amount detection means. When the amount exceeds the first determination criterion, the fan is driven at a low rotation speed, and when the amount exceeds the second determination criterion higher than the first determination criterion, the fan is driven at a high rotation speed. is there.

  As a result, when the amount of steam discharged from the household electrical appliance is small, the fan can be driven quietly at a low rotational speed, and when the amount of steam is large, the steam can be exhausted at a high rotational speed. The exhaust capacity can be varied according to the amount of steam of the household electrical appliance stored in the housing, and noise can be reduced.

  The household electrical appliance storage of the present invention can reduce noise by varying the exhaust capacity in accordance with the amount of steam of the household electrical appliance stored in the cabinet.

  According to a first aspect of the present invention, there is provided a cabinet, a household electrical appliance storage section provided in the cabinet and having an open front surface for storing household electrical appliances, and a discharge passage that incorporates a fan that communicates from the household electrical appliance storage section to the front of the cabinet. A discharge device, a control means for controlling the operation of the fan, and a steam amount detection means for detecting the amount of steam discharged from a household appliance, wherein the control means detects the steam detected by the steam amount detection means. The fan is driven at a low rotation speed when the amount exceeds the first determination criterion, and the fan is driven at a high rotation speed when the amount exceeds a second determination criterion higher than the first determination criterion. If the amount of steam discharged from household electrical appliances is small, the fan is quietly driven at a low rotational speed, and if the amount of steam is large, the steam is exhausted at a high rotational speed. Since bets can, it is possible to vary the pumping capacity in accordance with the amount of vapor of domestic electrical products housed in the cabinet, it is possible to reduce the noise.

  According to a second invention, in the first invention, the steam amount detecting means is constituted by a temperature detecting means provided in the discharge passage. When the steam amount is large and the exhaust temperature is high, the fan is rotated at a high rotational speed. The steam can be smoothly exhausted to the outside. Further, if necessary, the room temperature can be detected by the temperature detection means at the start of operation.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a power supply unit that supplies power to the household electrical appliance and a current detection unit that detects a current flowing through the power supply unit are provided. When the flowing current exceeds a predetermined current value, the fan is driven, and the operation of the home electric product is started, and when the current exceeding the predetermined current value flows to the power supply means, the fan is driven. When the steam is discharged from the household electrical appliance, the fan rotates, so that the discharged steam can be smoothly exhausted to the outside, and it is possible to prevent condensation in the discharge passage.

  According to a fourth invention, in the third invention, when the current flowing through the power supply means becomes smaller than a predetermined current value, the fourth invention includes delay means for stopping the fan after delaying the predetermined time, and delaying the delay means The time is shortened when the room temperature is higher than the predetermined temperature, and longer when the room temperature is lower than the predetermined temperature.When the current flowing through the power supply means becomes smaller than the predetermined current value and the fan is stopped, Since the vapor tends to condense at low temperatures, it is possible to prevent condensation by increasing the delay time, and it is difficult for the vapor to condense at high temperatures. Time can be shortened.

  According to a fifth aspect of the present invention, there is provided a cabinet, a household electrical appliance storage section provided in the cabinet and having an open front surface for storing household electrical appliances, and a discharge passage having a built-in fan communicating from the household electrical appliance storage section to the front of the cabinet. A discharge device, a control unit that controls the operation of the fan, a power supply unit that supplies power to the household electrical appliance, and a current detection unit that detects a current flowing through the power supply unit, the control unit including the power supply unit When the current flowing through the means exceeds the third determination criterion, the fan is driven at a low rotational speed, and when the current exceeds the fourth determination criterion higher than the third determination criterion, the fan is driven at a high rotational speed. A first step in which the household electrical appliance operates with a current exceeding the third criterion and the steam discharge is low or there is little steam discharge; In the first step, the fan is driven at a low rotational speed in the first step, and the second step is performed by flowing a current that exceeds the fourth determination criterion higher than the fourth determination criterion. Then, if the fan is driven at a high speed and the amount of steam discharged from household electrical appliances is large, the fan is driven at a high speed and the steam is exhausted. If not, the fan can be driven quietly at a low rotational speed, so that the exhaust capacity can be varied according to the amount of steam of the household electrical appliance housed in the cabinet, and noise can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a cross-sectional view of the household electrical appliance storage in Embodiment 1 of the present invention, FIG. 2 shows a front view of the household electrical appliance storage, and FIG. 3 shows the household electrical appliance storage The principal part block diagram is shown.

  As shown in FIG. 1 and FIG. 2, the cabinet 1 has a home electric appliance storage section 3 that opens a front surface and stores therein a home electric appliance 2 that generates steam such as a rice cooker 2 a and a jar pot 2 b. Yes. A slide base 4 on which the home appliance 2 is placed is storably provided on the lower surface of the home appliance storage unit 3 so that the home appliance 2 can be pulled out from the home appliance storage unit 3 as needed. ing. A door 5 is provided on the front surface of the home appliance housing 2 so as to be freely opened and closed. Further, a discharge device 6 is provided on the top surface of the home appliance storage unit 3 to discharge steam discharged from the stored home appliance 2 to the outside. Even when the product 2 is stored, the home electric product 2 can be used while stored.

  A vapor suction portion 7 having one large opening is provided on the lower surface of the discharge device 6, and a fan 8 is provided inside the discharge device 6. In order to efficiently suck steam in a wide range inside the steam suction section 7, a rectifying plate 9 having a plurality of holes (not shown) is provided, and steam generated in the home appliance storage section 3 is outside air. The steam is sucked from the holes of the rectifying plate 9 and the outer periphery of the rectifying plate 9. The sucked steam enters the fan 8 through the discharge passage 10, is discharged by the fan 8, and is discharged from a steam exhaust port 11 provided in front of the discharge device 6. A display unit 12 is provided on the front surface of the discharge device 6.

  The temperature detection means 13 constitutes a steam amount detection means for detecting the steam discharged from the household electrical appliance 2, is constituted by a thermistor, and is provided in the discharge passage 10. When the steam discharged from the household electrical appliance 2 is discharged to the outside through the discharge passage 10, the amount of steam can be detected by detecting the temperature rise due to the steam by the temperature detecting means 13. The power supply means 14 is constituted by outlets 14 a and 14 b and is connected to the home electrical product 2 to supply power, and is provided in the home electrical product storage unit 3.

  The control means 15 controls the operation of the fan 8, and as shown in FIG. 3, is configured to control the fan 8 based on the output of the temperature detection means 13, and the temperature (vapor) detected by the temperature detection means 13 is controlled. When the amount exceeds the first determination criterion (for example, 40 ° C.), it is determined that the amount of steam is small, and the fan 8 is driven at a low rotation speed (for example, about 800 r / min) to determine the first determination. When the second determination criterion (for example, 50 ° C.) higher than the criterion is exceeded, it is determined that the amount of steam is large, and the fan 8 is driven at a high rotational speed (for example, about 1300 r / min). Reference numeral 16 denotes a plug for connecting the household electrical appliance 2 to the power supply means 14.

  The operation and action of the above configuration will be described. The household electrical appliance 2 is placed on a slide base 4 provided on the lower surface of the household electrical appliance storage section 3 to store the household electrical appliance 2 in the household electrical appliance storage section 3, and an outlet 14 a in the household electrical appliance storage section 3. , 14b, the door 5 is closed and the operation is started. Here, when the home electric appliance 2 is the rice cooker 2a, the operation starts from the rice cooking process, and when it is the jar pot 2b, the operation starts from the boiling process. Steam is discharged from product 2.

  On the other hand, the temperature detection means 13 which comprises the steam quantity detection means which detects the amount of steam is provided in the discharge passage 10, and when the temperature detected by the temperature detection means 13 exceeds the first determination criterion (40 ° C.), The control means 15 drives the fan 8 in the discharge device 6 at a low rotational speed (about 800 r / min). When the fan 8 is operated, the steam discharged from the household electrical appliance 2 and sucked from the steam suction unit 7 together with the outside air by the fan 8 is discharged to the outside through the steam exhaust port 11 via the internal duct 10.

  At this time, the rectifying plate 9 installed inside the steam suction unit 7 has a plurality of holes at positions facing the steam port 17 of the home appliance 2 stored in the home appliance storage unit 3. The steam discharged from the steam port 17 is sucked into the discharge device 6 through a plurality of holes as shown by an arrow a in FIG. 1, and a part of the current plate 9 is shown as shown by an arrow b in FIG. Is sucked into the discharge device 6 from the outer periphery. The sucked steam is discharged from the steam exhaust port 11 through the discharge passage 10.

  Furthermore, when the amount of steam discharged from the household electrical appliance 2 increases and the temperature detected by the temperature detection means 13 exceeds the second determination criterion (50 ° C.) higher than the first determination criterion, the control means 15 8 is driven at a high rotational speed (about 1300 r / min). As a result, the exhaust capacity can be varied according to the amount of steam of the home appliance stored in the cabinet 1.

  In recent years, home appliances 2 have become mainstream for pursuing deliciousness and changing energization due to the development of electronic technology. As a result, the discharged steam is not constant but is changing. Therefore, it is not necessary to make the exhaust capacity necessary for the steam treatment constant, it is possible to increase the capacity when the amount of steam is large, and to decrease the capacity when the amount of steam is small. Not only can it be reduced, but it can also be effective in saving energy.

  As described above, in the present embodiment, the control unit 15 drives the fan 8 at a low rotational speed when the temperature (steam amount) detected by the temperature detection unit 13 exceeds the first determination criterion. Since the fan 8 is driven at a high rotational speed when the second determination standard higher than the first determination standard is exceeded, when the amount of steam discharged from the home appliance 2 is small, the fan 8 is quiet at a low rotational speed. When the fan 8 is driven and the amount of steam is large, the steam can be exhausted at a high rotational speed, and the exhaust capacity can be varied according to the amount of steam of the home appliance 2 stored in the cabinet 1. , Noise can be reduced.

  Further, since the steam amount detecting means is constituted by the temperature detecting means 13 provided in the discharge passage 10, when the steam amount is large and the exhaust temperature is high, the fan 8 can be operated at a high rotational speed, and the steam is smoothly supplied. Can be exhausted to the outside. Further, the room temperature can be detected by the temperature detection means 13 at the start of operation as required.

  In the present embodiment, the number of rotations of the fan 8 is variable in two stages, but there is no problem even if it is multistage. Further, the rotational speed control of the fan 8 can be performed by power source phase control, motor coil tap switching, or the like.

  Further, when using a motor whose rotational speed varies depending on the power supply frequency, it is possible to detect the frequency and control the fan 8 so that the predetermined rotational speed is obtained. For example, in the case of a coiled coil motor, as shown in (Table 1), it is configured so that taps can be switched between three types: strong, standard, and weak. Number and high rotation speed can be obtained.

  In Table 1, weak is about 800 r / min and strong is about 1300 r / min.

  Moreover, in this Embodiment, although the case of the rice cooker 2a and the jar pot 2b was demonstrated as the household electrical appliance 2, what is necessary is just to produce | generate steam, such as a coffee maker, and the same effect | action and effect can be acquired.

(Embodiment 2)
FIG. 4 is a block diagram showing a main part of a household electrical appliance storage case according to Embodiment 2 of the present invention.

  As shown in FIG. 4, the current detection unit 18 detects a current flowing through the power supply unit 14 and inputs its output to the control unit 15. When the current flowing through the power supply means 14 exceeds a predetermined current value (for example, 2A), the control means 15 operates in the rice cooking process when the household electrical appliance 2 is the rice cooker 2a, and the jar pot 2b. The fan 8 is driven on the assumption that it is operating in the boiling process. Other configurations are the same as those of the first embodiment, and the same reference numerals are given and description thereof is omitted.

  The operation and action of the above configuration will be described. The household electrical appliance 2 is placed on a slide base 4 provided on the lower surface of the household electrical appliance storage section 3 to store the household electrical appliance 2 in the household electrical appliance storage section 3, and an outlet 14 a in the household electrical appliance storage section 3. After the door 5 is closed and the operation of the home electric appliance 2 is started, if the home electric appliance 2 is the rice cooker 2a, it operates in the rice cooking process, and if it is the jar pot 2b, in the boiling process Since it operates, since the current flowing through the power supply means 14 exceeds a predetermined current value (2A), the fan 8 in the discharge device 6 operates. Thereby, the vapor | steam discharged | emitted from the household electrical appliance 2 is discharged | emitted from the vapor | steam exhaust port 11 through the discharge passage 10 similarly to the said Embodiment 1. FIG.

  Here, in the rice cooking process when the home electric appliance 2 is the rice cooker 2a and the hot water boiling process when the home electric appliance 2 is the jar pot 2b, the steam is discharged from the home electric appliance 2 before starting the operation. Therefore, when the temperature detected by the temperature detection means 13 exceeds the first criterion (40 ° C.), the control means 15 drives the fan 8 in the discharge device 6 at a low rotational speed (about 800 r / min).

  Furthermore, when the amount of steam discharged from the household electrical appliance 2 increases and the temperature detected by the temperature detection means 13 exceeds the second determination criterion (50 ° C.) higher than the first determination criterion, the control means 15 8 is driven at a high rotational speed (about 1300 r / min). As a result, the exhaust capacity can be varied according to the amount of steam of the home appliance stored in the cabinet 1.

  Thus, as long as the electric current which flows into the electric power feeding means 14 is over a predetermined | prescribed electric current value (2A) at the rice cooking process when the household appliance 2 is the rice cooker 2a, and when it is the jar pot 2b, the electric current which flows into the feed means 14 The fan 8 operates continuously. Next, even if the household electrical appliance 2 is either the rice cooker 2a or the jar pot 2b, the current flowing through the power feeding means 14 becomes equal to or less than a predetermined current value (2A) when entering the heat retaining process. Stops the fan 8.

  As described above, in the present embodiment, the control unit 15 drives the fan 8 when the current flowing through the power supply unit 14 exceeds a predetermined current value (2A). 2 is started, and the fan 8 is driven when a current exceeding a predetermined current value flows through the power supply means 14, so that when the steam is discharged from the household electrical appliance 2, the fan 8 is rotating and discharged. The steam can be smoothly exhausted to the outside, and condensation on the discharge passage 10 and the like can be prevented.

(Embodiment 3)
FIG. 5 shows a block diagram of the main part of the household electrical appliance storage in Embodiment 3 of the present invention.

  As shown in FIG. 5, the delay means 19 has a predetermined current value (for example, a current flowing through the power supply means 14 when the household electrical appliance 2 (both the rice cooker 2 a and the jar pot 2 b) enters a heat retaining process. 2A), the fan 8 is delayed for a predetermined time and then stopped. The delay time of the delay means 19 is short when the room temperature is higher than a predetermined temperature (for example, 10 ° C.). A time (for example, 10 minutes) is set, and when the temperature is lower than a predetermined temperature, a long time (for example, 30 minutes) is set. Other configurations are the same as those of the second embodiment, and the same reference numerals are given and description thereof is omitted.

  The operation and action of the above configuration will be described. Note that the operation in the rice cooking process when the home appliance 2 is the rice cooker 2a and the operation in the hot water heating process in the case of the jar pot 2b are the same as those in the second embodiment, and thus the description thereof is omitted. To do.

  Regardless of whether the household electrical appliance 2 is the rice cooker 2a or the jar pot 2b, the current flowing through the power supply means 14 becomes equal to or less than a predetermined current value (2A) when entering the heat retaining process. When 19 delay times have elapsed, the fan 8 is stopped.

  At this time, when the room temperature is low, it is necessary to keep the fan 8 operating for a long time because the vapor tends to condense. Therefore, when the room temperature detected by the temperature detection means 13 at the start of operation is lower than a predetermined temperature (10 ° C.) After a long time (30 minutes) has elapsed, dew condensation can be prevented by stopping the fan 8. In addition, when the room temperature is higher than a predetermined temperature (10 ° C.), it is difficult for the vapor to condense. Therefore, the operating time of the fan 8 can be shortened by stopping the fan 8 after a short time (10 minutes) has elapsed. .

  As described above, in the present embodiment, when the current flowing through the power supply means 14 becomes smaller than the predetermined current value (2A), the delay means 19 is provided that stops the fan 8 after a delay operation for a predetermined time, The delay time of the delay means 19 is shortened when the room temperature is higher than the predetermined temperature (10 ° C.), and longer when the room temperature is lower than the predetermined temperature. Therefore, the current flowing through the power supply means 14 becomes smaller than the predetermined current value. When the fan 8 is stopped, condensation can be prevented by increasing the delay time when the room temperature is low, and shortening the operation time of the fan 8 by shortening the delay time when the room temperature is high. be able to.

(Embodiment 4)
FIG. 6 shows a block diagram of a main part of the household electrical appliance storage in Embodiment 4 of the present invention.

  As shown in FIG. 6, the current detection unit 18 detects a current flowing through the power supply unit 14 and inputs its output to the control unit 15. The control means 15 drives the fan 8 at a low rotational speed (for example, about 800 r / min) when the current flowing through the power supply means 14 exceeds the third determination standard (for example, 4 A), and the third determination standard. When a higher fourth determination criterion (for example, 8A) is exceeded, the fan 8 is configured to be driven at a high rotation speed (for example, about 1300 r / min). Other configurations are the same as those of the second embodiment, and the same reference numerals are given and description thereof is omitted.

  The operation | movement and effect | action in case the household electrical appliance 2 is the rice cooker 2a in the said structure are demonstrated.

  In the rice cooking process, the rice cooker 2a operates with a current exceeding the third determination criterion, and operates according to a water absorption step (first step) with little or no steam discharge, and from the third determination criterion. A cooking process (second process) in which a current exceeding a high fourth determination criterion flows and operates and steam discharge is large.

  After storing the rice cooker 2a (home appliance 2) in the household electrical appliance storage unit 3 and connecting it to the outlet 14a, when the door 5 is closed and the operation is started, the rice cooker 2a enters the water absorption process of the rice cooking process, Since the current flowing through the power supply means 14 exceeds the third determination criterion (4A), the fan 8 in the discharge device 6 is driven at a low rotational speed (about 800 r / min). Thereby, the vapor | steam discharged | emitted from the rice cooker 2a is discharged | emitted from the vapor | steam exhaust port 11 through the discharge passage 10, like the said Embodiment 1. FIG.

  Next, when the cooking process is started, since the current flowing through the power supply means 14 exceeds the fourth determination criterion (8A), the fan 8 in the discharge device 6 is driven at a high rotational speed (about 1300 r / min). Thereby, a large amount of steam discharged from the rice cooker 2a can be discharged.

  In addition, since the current flowing through the power supply unit 14 becomes equal to or less than a predetermined current value (2A) as in the second embodiment, the control unit 15 stops the fan 8 when entering the heat retaining process.

  As described above, in the present embodiment, the control unit 15 drives the fan 8 at a low rotational speed (about 800 r / min) when the current flowing through the power supply unit 14 exceeds the third determination criterion. When the fourth determination criterion higher than the third determination criterion is exceeded, the fan 8 is driven at a high rotation speed (about 1300 r / min), so that a current exceeding the third determination criterion flows and operates. In the water absorption process where there is little discharge of steam or little steam, the fan is driven at a low rotation speed, and it operates with a current exceeding the fourth judgment standard higher than the third judgment standard. In the process, the fan 8 is driven at a high rotational speed so that when the amount of steam discharged from the household electrical appliance is large, the fan 8 is driven at a high rotational speed to exhaust the steam. Almost no discharge Since the fan 8 can be quietly driven at a low rotational speed, the exhaust capacity can be varied according to the amount of steam of the household electrical appliance stored in the cabinet 1, and noise can be reduced. it can.

  As described above, the household electrical appliance storage according to the present invention can reduce noise by changing the exhaust capacity in accordance with the amount of steam of the household electrical product stored in the cabinet. It is useful as a home appliance storage that can be used in a state in which it is stored.

Sectional drawing of the household electrical appliance storage in Embodiment 1 of this invention Front view of the household electrical appliance storage Main block diagram of the household electrical appliance storage The principal part block diagram of the household electrical appliance storage in Embodiment 2 of this invention Main part block diagram of household electrical appliance storage in Embodiment 3 of this invention Main part block diagram of household electrical appliance storage in Embodiment 4 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cabinet 2 Household appliance 3 Household appliance storage part 6 Discharge device 8 Fan 10 Discharge passage 13 Temperature detection means (vapor amount detection means)
15 Control means

Claims (5)

A cabinet, a household electrical appliance storage section provided in the cabinet and having a front opening for storing household electrical appliances, and a discharge device having a discharge passage communicating from the household electrical appliance storage section to the front of the cabinet and incorporating a fan; Control means for controlling the operation of the fan, and steam amount detection means for detecting the amount of steam discharged from the household electrical appliance, wherein the control means determines whether the steam amount detected by the steam amount detection means is a first determination. Household appliance storage that is configured to drive the fan at a low rotation speed when exceeding a reference, and to drive the fan at a high rotation speed when exceeding a second determination criterion that is higher than the first determination criterion. . 2. The home appliance storage case according to claim 1, wherein the steam amount detection means comprises temperature detection means provided in the discharge passage. A power supply unit configured to supply power to the household electrical appliance; and a current detection unit configured to detect a current flowing through the power supply unit. The control unit drives the fan when the current flowing through the power supply unit exceeds a predetermined current value. The household electrical appliance storage case according to claim 1 or 2. When the current flowing through the power supply means becomes smaller than a predetermined current value, the fan is provided with delay means for stopping the fan after being delayed for a predetermined time, and the delay time of the delay means is such that the room temperature is higher than the predetermined temperature. The household electrical appliance storage case according to claim 3, wherein the storage is made shorter and longer when the temperature is lower than a predetermined temperature. A cabinet, a household electrical appliance storage section opened in the cabinet for storing household electrical appliances, and a discharge device having a discharge passage communicating with the front of the cabinet from the household electrical appliance storage section and incorporating a fan; A control means for controlling the operation of the fan; a power supply means for supplying power to the household electrical appliance; and a current detection means for detecting a current flowing through the power supply means. When the determination criterion of 3 is exceeded, the fan is driven at a low rotational speed, and when the fourth determination criterion higher than the third determination criterion is exceeded, the fan is driven at a high rotational speed. Product storage.

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