JP6222366B2 - Dehumidifier - Google Patents

Description

  The present invention relates to a dehumidifier that dehumidifies indoor moisture.

  Conventionally, for example, Patent Document 1 discloses a technique related to control of a dehumidifier capable of arbitrarily selecting a desired humidity value. In this technique, when the humidity of the room falls below a set humidity value, the compressor is stopped and only the blower is driven. Then, when the humidity of the room exceeds the set humidity due to the stop of the operation of the compressor, the operation of the compressor is resumed and the room is dehumidified.

Japanese Unexamined Patent Publication No. 7-233999

  In the above conventional technique, after the room humidity reaches the set humidity, the compressor is repeatedly stopped and restarted in order to keep the room humidity constant. Once the operation of the compressor is stopped, the cooled refrigerant in the evaporator returns to room temperature. For this reason, in the above conventional technique, when the operation of the compressor is resumed, the indoor air cannot be dehumidified until the refrigerant in the evaporator is cooled, resulting in waste. In addition, large vibrations occur when the compressor is started and stopped. For this reason, in the above-described conventional technique for performing intermittent operation, there is a problem that the life of the pipe or the compressor motor is shortened due to an increase in operation sound and vibration.

  This invention was made in order to solve the above-mentioned subject, and it aims at providing the dehumidifier which can implement | achieve setting humidity, suppressing the intermittent operation of a compressor.

The dehumidifier according to the present invention includes a compressor that compresses the refrigerant, a condenser that cools the refrigerant compressed by the compressor, a decompression device that decompresses the refrigerant cooled by the condenser, and a decompression device that decompresses the refrigerant. An evaporator that absorbs heat to the refrigerant, and a dehumidifying means that condenses and removes moisture contained in the air by the evaporator, and after taking in indoor air and passing through the evaporator A blower fan that blows the dry air into the room, a humidity detection means for detecting the humidity in the room, a control means for controlling the dehumidification means and the blower fan so that the detected humidity detected by the humidity detection means becomes the set humidity, And the control means is configured to execute a first control that changes the rotational speed per unit time of the compressor stepwise based on a difference between the detected humidity and the set humidity . Detection humidity and set humidity The number of rotations per unit time of the compressor is stored in advance for each of a plurality of rank values corresponding to the range of the difference between and the control means to increase or decrease the rank value based on the difference between the detected humidity and the set humidity. Thus, the rotational speed per unit time of the compressor in the first control is configured to change stepwise .

  According to the present invention, since the control for changing the rotational speed per unit time of the compressor stepwise is performed based on the difference between the detected humidity and the set humidity, the setting is performed while suppressing the intermittent operation of the compressor. Humidity can be realized.

It is a longitudinal cross-sectional view which shows the internal structure of the dehumidifier which concerns on Embodiment 1. FIG. It is a schematic block diagram which shows the inside of the dehumidifier which concerns on Embodiment 1. FIG. It is a schematic block diagram which shows the external appearance of the dehumidification means of Embodiment 1. FIG. 3 is a schematic configuration diagram showing a refrigerant circuit constituting the dehumidifying means according to the first embodiment. The map which memorize | stored the compressor frequency of the compressor and the fan rotation speed of the ventilation fan for every rank value is shown. 4 is a flowchart showing a dehumidifying operation routine executed by the control means in the first embodiment. The map which defined the dehumidification driving | operation operation | movement with respect to detected temperature is shown. The map which defined the dehumidification driving | operation operation | movement with respect to the detected water amount is shown.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and overlapping descriptions are simplified or omitted as appropriate.

Embodiment 1 FIG.
FIG. 1 is a longitudinal sectional view showing the internal configuration of the dehumidifier according to Embodiment 1. FIG. FIG. 2 is a schematic configuration diagram showing the inside of the dehumidifier according to the first embodiment. As shown in these drawings, the dehumidifier of the present embodiment includes a dehumidifier housing 1 configured to be able to stand on its own, a suction port 2 for taking indoor air A into the dehumidifier housing 1, and moisture. The appearance is constituted by the air outlet 3 that discharges the dry air B from which the air is removed from the dehumidifier housing 1 into the room.

  As shown in FIG. 2, the dehumidifier according to the present embodiment detects the temperature of the indoor air A and the humidity sensor 4 as humidity detecting means for detecting the humidity of the indoor air A sucked from the suction port 2. And a temperature sensor 5 as temperature detecting means. In the following description, the humidity and temperature detected by the humidity sensor 4 and the temperature sensor 5 are referred to as “detected humidity” and “detected temperature”, respectively.

  Further, the dehumidifier according to the present embodiment includes a dehumidifying means 6 that removes moisture contained in the room air A to generate dry air B, and a water storage tank that stores moisture removed from the indoor air A by the dehumidifying means 6. 7. The detailed configuration of the dehumidifying means 6 will be described later.

  The water storage tank 7 is provided with a water level sensor 8 as water amount detecting means for detecting the amount of water in the water storage tank 7. In the following description, the amount of water detected by the water level sensor 8 is referred to as “detected water amount”.

  A blower fan 9 is provided inside the dehumidifier housing 1. The blower fan 9 sucks the indoor air A from the suction port 2 and introduces it into the dehumidifying means 6, and generates an air flow that discharges the dry air B that has passed through the dehumidifying means 6 from the blower outlet 3.

  The dehumidifier according to the present embodiment includes a control unit 10 and an operation unit 11. The operation unit 11 is for the user to operate the dehumidifier, and information such as selection of a dehumidification mode and input of set humidity is input by the user. The control unit 10 controls the operations of the dehumidifying unit 6 and the blower fan 9 based on the detection values of the various sensors described above and information input to the operation unit 11.

  Next, the dehumidifying means 6 provided in the dehumidifier according to the present embodiment will be described in detail. FIG. 3 is a schematic configuration diagram showing the appearance of the dehumidifying means of the first embodiment. As shown in this figure, the dehumidifying means 6 decompresses and expands the compressor 12 that compresses the refrigerant, the condenser 13 that cools the refrigerant that has been pressurized by the compressor 12, and the refrigerant that is cooled by the condenser 13. A capillary tube 14 serving as a decompression device and an evaporator 15 that absorbs heat to the refrigerant decompressed and expanded in the capillary tube 14 are configured.

  FIG. 4 is a schematic configuration diagram showing a refrigerant circuit constituting the dehumidifying means according to the first embodiment. As shown in this figure, the compressor 12, the condenser 13, the capillary tube 14, and the evaporator 15 mentioned above comprise the refrigerant circuit by being connected in order by piping. The control means 10 performs the dehumidifying operation when detecting that the dehumidifying mode is selected from the switch operation of the operation unit 11. In the dehumidifying operation, specifically, the blower fan 9 is rotated and the dehumidifying means 6 is driven so that the detected humidity detected by the humidity sensor 4 becomes the set humidity input from the operation unit. When the blower fan 9 is driven, the indoor air A is taken into the dehumidifying means 6 in the dehumidifier housing 1 from the suction port 2. In the dehumidifying means 6, when the compressor 12 is driven, the refrigerant circulates in the refrigerant circuit. When the room air A passes through the evaporator 15, moisture contained in the air is condensed. The air that has passed through the dehumidifying means 6 is dehumidified to become dry air B, and is blown out into the room through the outlet 3.

  In addition, as shown in FIG. 4, the control means 10 includes an inverter circuit 16. The inverter circuit 16 is a circuit that converts a DC voltage converted by a converter circuit (not shown) into an AC voltage having an arbitrary voltage, frequency, and phase. The control means 10 controls the inverter circuit 16 based on inputs from the humidity sensor 4, the temperature sensor 5, the water level sensor 8, etc., and variably controls the frequency of the AC voltage supplied to the compressor 12 and the blower fan 9. To do. More specifically, the control means 10 controls the inverter circuit 16 so that the compressor frequency (Hz) supplied to the compressor 12 becomes a required frequency. Thereby, the compressor 12 is controlled to the rotation speed (Hz) per unit time according to the supplied compressor frequency (Hz). Moreover, the control means 10 controls the inverter circuit 16 so that the rotation speed (rpm) per unit time of the blower fan 9 becomes the required rotation speed. Here, the output of the compressor 12 increases as the rotational speed per unit time increases. Moreover, the output of the blower fan 9 increases as the rotational speed per unit time increases.

  Next, the characteristic operation of the dehumidifier according to the present embodiment will be described. In a device that controls the compressor 12 and the blower fan 9 so that the detected humidity becomes the set humidity as in the conventional dehumidifier, the dehumidifying operation is stopped when the detected humidity reaches the set humidity. Then, when the detected humidity becomes higher than the set humidity again, the dehumidifying operation is started again. If such intermittent operation of the compressor 12 is frequently performed, there is a possibility that problems such as an increase in operation sound and a shortened life of various parts due to vibration may occur.

  Therefore, in the dehumidifier according to the present embodiment, in the dehumidifying operation, the compressor frequency (Hz) of the compressor 12 of the dehumidifying means 6 is variably set according to the difference (%) between the detected humidity and the set humidity. One control and a second control for setting the rotation speed (rpm) of the blower fan 9 per minute to be variable (in a stepwise manner) are executed. In the control means 10, the compressor frequency and the fan speed corresponding to the difference between the detected humidity and the set humidity are stored in the map for each rank value. FIG. 5 shows a map in which the compressor frequency of the compressor 12 and the fan rotation speed of the blower fan 9 are stored for each rank value. In this map, the rank value from 1 to 4 is classified according to which range the difference (%) between the set humidity and the detected humidity belongs, and the compressor frequency and the fan speed are determined for each rank value. The value associated with each rank value is a value determined in advance by performing an experiment or the like. The smaller the difference between the set humidity and the detected humidity, that is, the smaller the rank value, the compressor frequency (Hz). The fan rotation speed (rpm) is set to a small value. When the dehumidifying operation is performed using such a map, the compressor frequency and the fan rotation speed gradually decrease as the detected humidity approaches the set humidity. The dehumidifying capacity decreases as the compressor frequency or the fan speed decreases. As a result, when the detected humidity is sufficiently higher than the set humidity, the dehumidifying capacity can be increased to quickly bring the detected humidity close to the set humidity, and when the detected humidity approaches the set humidity, the dehumidifying capacity is increased. It is possible to continue the dehumidifying operation while suppressing it.

  Next, the specific process of the dehumidification operation performed in the dehumidifier of this Embodiment is demonstrated in detail using a flowchart. FIG. 6 is a flowchart showing a dehumidifying operation routine executed by the control means 10 in the first embodiment. The routine shown in this figure is executed when it is detected that the dehumidifying mode is selected from the switch operation of the operation unit 11.

  When the routine shown in FIG. 6 is started, first, the humidity is detected by the humidity sensor 4 (step S2). Then, the rank value shown in FIG. 5 is selected according to the difference between the set humidity set by the operation unit 11 and the detected humidity.

  Next, the initial operation of the dehumidifying operation is determined based on the rank value selected in step S2 (step S4). Specifically, the blower fan 9 and the compressor 12 are controlled by controlling the inverter circuit 16 and the compressor frequency and the fan rotation speed corresponding to the rank values shown in the map of FIG. In addition, the fluctuation of humidity is severe immediately after the start of operation. For this reason, here, the operation is performed in the initial operation for 3 minutes immediately after the start of the operation, and the intermittent operation of the compressor 12 occurs frequently and the motor is prevented from being worn.

  When the initial operation is performed for 3 minutes, the humidity is then measured every minute (step S6). Next, it is determined whether or not the detected humidity is equal to or lower than the set humidity (step S8). As a result, when the detected humidity is equal to or lower than the set humidity, the operation of the blower fan 9 and the compressor 12 is stopped (step S10). In the next step, the humidity is measured every minute (step S12). Then, it is determined whether or not the detected humidity is higher than the set humidity (step S14). As a result, when it is determined that the detected humidity is equal to or lower than the set humidity, the process returns to step S12, and the humidity measurement is performed again. On the other hand, when it is determined that the detected humidity is higher than the set humidity again, the process returns to step S4, and the initial operation is started again according to the difference between the detected humidity and the set humidity.

  On the other hand, if the detected humidity is higher than the set humidity in step S8, the process proceeds to the next step and the previous value of the detected humidity measured one minute ago (that is, the detected humidity measured in the previous step S6). Is compared with the current value of the detected humidity (that is, the detected humidity measured in the current step S6) (step S16). As a result, if it is determined that the detected humidity has increased from one minute before, a rank increase is performed to increase the rank value by one (step S18). Thereby, for example, when the humidity increases due to ventilation of the room, the outputs of the blower fan 9 and the compressor 12 are increased, so that the room can be quickly dehumidified.

  In Step S16, when it is determined that the detected humidity has not changed from one minute before, the process proceeds to the next step, and it is determined whether or not the detected humidity is the same as the set humidity (Step S20). ). As a result, if the detected humidity is the same as the set humidity, the process returns to step S6 without changing the rank value, and the humidity is measured again. On the other hand, if the detected humidity is not the same as the set humidity, the process proceeds to the next step, where the detected humidity is stored, and it is determined whether or not a state in which the humidity does not change continues three times (step S22). ). As a result, when it is determined that the state in which the humidity does not change is continued three times in succession, the process returns to step S6 without changing the rank value, and the humidity is measured again. On the other hand, if it is determined that the state where the humidity does not change continues three times in succession, the process proceeds to step S18, where the rank is increased by one. Thereby, for example, it is possible to determine the state in which the humidity of the room does not decrease and increase the outputs of the blower fan 9 and the compressor 12, so that the room can be quickly dehumidified.

  Furthermore, when it is determined in step S16 that the detected humidity has decreased from one minute before, the process proceeds to the next step, and it is determined whether or not rank up has been performed in step S18 (step S18). S24). As a result, when it is determined that the rank has not been increased, the detected humidity is compared with the set humidity, and the rank value shown in FIG. 5 is determined based on the humidity difference (step S26). Here, specifically, when the humidity difference X between the detected humidity and the set humidity reaches 10%, 5%, 2%, and 0% for the first time, the rank value is lowered by one. Thereby, the rank value can be gradually lowered as the detected humidity approaches the set humidity. In addition, after changing to the determined rank value, it returns to said step S6 and humidity is measured again. Moreover, when rank down is performed in step S26, the control means 10 memorize | stores the log | history. Thereby, it is possible to control so that the operation of lowering the rank value is performed only once. The rank down history stored in step S26 is reset in the process of step S30 described later.

  On the other hand, if it is determined in step S24 that the rank has been increased, the process proceeds to the next step, and it is determined whether or not the detected humidity is the same as the set humidity (step S28). As a result, if the detected humidity is not the same as the set humidity, the process returns to step S6 without changing the rank value, and the humidity is measured again. On the other hand, when the detected humidity is the same as the set humidity, rank down is performed to lower the rank value by one (step S30). Thereby, for example, when the indoor humidity becomes the set humidity, the outputs of the blower fan 9 and the compressor 12 are reduced, so that the humidity can be prevented from continuing to decrease beyond the set humidity. .

  As described above, according to the dehumidifier of the present embodiment, the rank value is lowered stepwise as the detected humidity approaches the set humidity. Thereby, it becomes possible to suppress that the detected humidity reaches the set humidity and the intermittent operation of the blower fan 9 and the compressor 12 is performed. As a result, the humidity of the room can be kept constant, and it is possible to prevent the life from being shortened due to noise caused by intermittent operation and vibration of the compressor motor.

  Further, according to the dehumidifier of the first embodiment, the inverter circuit 16 that varies the frequency of the compressor 12 is provided, and is controlled so as to gradually decrease the frequency of the compressor 12 as the indoor humidity decreases. Therefore, power consumption can be reduced.

  By the way, in the dehumidifier of Embodiment 1 mentioned above, the rank value was determined according to the map shown in FIG. 5, and the compressor 12 and the ventilation fan 9 were controlled. However, the map for determining the rank value is not limited to that shown in FIG. 5. For example, an AC frequency for controlling the driving of the blower fan 9 may be set instead of the fan rotation speed. Further, the values of the compressor frequency and the fan speed corresponding to each rank value are not limited to the values specified in FIG. Further, the number of rank values is not limited to four, and more rank values may be set as long as there are a plurality of rank values.

  Moreover, in the dehumidifier of Embodiment 1 mentioned above, although it is supposed that the rotation speed of the ventilation fan 9 is controlled using the inverter circuit 16, it uses other well-known controls, such as phase control and PMW control. 9 may be variably controlled.

  Moreover, in the dehumidifier of Embodiment 1 mentioned above, although the capillary tube 14 is used as a decompression device, you may use another well-known decompression device.

  Moreover, in the dehumidifier of Embodiment 1 mentioned above, both the 1st control which sets the compressor frequency of the compressor 12 variably, and the 2nd control which sets the fan rotation speed of the ventilation fan 9 variably are performed. However, only the first control for variably setting the compressor frequency of the compressor 12 may be executed.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to FIG. In addition, the dehumidifier of this Embodiment 2 is realizable using the structure similar to the hardware structure shown in FIGS. 1-4.

  In the dehumidifier of Embodiment 1 described above, the rank value shown in FIG. 5 is determined according to the difference between the detected humidity and the set humidity. The dehumidifier according to the second embodiment is characterized by an operation for limiting the rank value determined according to the temperature of the indoor air A sucked from the suction port 2. FIG. 7 shows a map that defines the dehumidifying operation for the detected temperature. In the dehumidifier of the second embodiment, when the rank value is determined in the dehumidifying operation, the restriction defined in the map of FIG. 7 is provided. More specifically, in the map shown in FIG. 7, when the detected temperature detected by the temperature sensor 5 is 30 ° C. or lower, the rank value is determined according to the map shown in FIG. When the detected temperature is in the range of 31 ° C. to 34 ° C., the rank value is fixed at rank 2 regardless of the map shown in FIG. Furthermore, when the detected temperature is 35 ° C. or higher, the rank value is fixed to rank 1 regardless of the map shown in FIG. Thus, it controls so that the rotation speed per unit time of a compressor and a ventilation fan becomes small, so that detection temperature is high.

  When performing the dehumidifying operation, the higher the temperature of the indoor air A, the higher the outer temperature of the compressor 12, and the room temperature also increases accordingly. According to the dehumidifier of the second embodiment, the output of the compressor 12 and the output of the blower fan 9 are limited when the detected temperature is equal to or higher than the set temperature (here, 31 ° C.). The restriction of the set temperature and the corresponding rank value is set to a set temperature and a rank value so that the compressor 12 does not overheat in consideration of the relationship between the temperature of the compressor 12 and the temperature of the room air A. do it. Thereby, even if the temperature of indoor air A is high, it can suppress that the temperature and room temperature of the compressor 12 rise. The reason for restricting the output of the blower fan 9 when the detected temperature is equal to or higher than the set value is that the dehumidifying ability can be controlled in a balanced manner by changing the output of the blower fan 9 in accordance with the output of the compressor 12. That is, since the temperature rise of the compressed refrigerant is suppressed when the output of the compressor 12 is reduced, the method of suppressing the cooling capacity of the condenser 13 according to this, that is, the method of suppressing the output of the blower fan 9, This is because the dehumidifying ability can be controlled in a well-balanced manner. Further, when the output of the compressor 12 is reduced, the noise generated from the compressor 12 is also reduced. Accordingly, the noise of the entire dehumidifier is reduced by suppressing the output of the blower fan 9 and the noise generated from the blower fan 9 accordingly. It is because it can suppress.

  In the dehumidifier of the second embodiment, when the detected temperature is equal to or higher than the set temperature, the output of the compressor 12, that is, the number of rotations per unit time of the compressor 12 is limited. When the “first limiting means” is realized and the detected temperature is equal to or higher than the set temperature, the output of the blower fan 9, that is, the rotation speed per unit time of the blower fan 9 is limited. Means "are realized. Further, only one of the first limiting unit and the third limiting unit may be executed.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described with reference to FIG. In addition, the dehumidifier of this Embodiment 3 is realizable using the structure similar to the hardware constitutions shown in FIGS.

  In the dehumidifier of Embodiment 1 described above, the rank value shown in FIG. 5 is determined according to the difference between the detected humidity and the set humidity. The dehumidifier according to the third embodiment is characterized by an operation for limiting the rank value determined according to the amount of water in the water storage tank 7. FIG. 8 shows a map that defines the dehumidifying operation for the detected water amount. In the dehumidifier of the third embodiment, when the rank value is determined in the dehumidifying operation, the restriction defined in the map of FIG. 8 is provided. More specifically, in the map shown in FIG. 8, when the detected water amount detected by the water level sensor 8 is less than the set water amount, the rank value is determined according to the map shown in FIG. When the detected water amount is equal to or greater than the set water amount, the rank value is fixed to rank 1 regardless of the map shown in FIG. Thereby, the output of the compressor 12 and the output of the blower fan 9 in the dehumidifying operation are limited. Further, when the detected water amount is a water amount indicating full water, the dehumidifying operation is stopped. The restriction of the set water amount and the rank value corresponding thereto may be set to a set water amount and a rank value so that the water storage tank 7 does not become full in consideration of the capacity of the water storage tank 7 and the dehumidifying capacity. Thereby, the output of the compressor 12 and the output of the blower fan 9 in the dehumidifying operation can be restricted before the water tank 7 becomes full, and the dehumidifying operation is continued after the water tank 7 becomes full. Can be avoided.

In the dehumidifier of the third embodiment, the output of the compressor 12 is limited when the detected water amount is equal to or greater than the set water amount, thereby realizing the “second limiting means” of the present invention, and the detected water amount is When the amount of water is equal to or greater than the set amount of water, the output of the blower fan 9 is restricted, thereby realizing the “fourth restriction means” of the present invention. Further, only one of the second restriction unit and the fourth restriction unit may be executed.

  DESCRIPTION OF SYMBOLS 1 Dehumidifier housing | casing, 2 Suction port, 3 Outlet, 4 Humidity sensor, 5 Temperature sensor, 6 Dehumidification means, 7 Water storage tank, 8 Water level sensor, 9 Blower, 10 Control means, 11 Operation part, 12 Compressor, 13 Condenser, 14 Capillary tube (pressure reduction device), 15 Evaporator, 16 Inverter circuit

Claims (14)

A compressor that compresses the refrigerant; a condenser that cools the refrigerant compressed by the compressor; a decompression device that decompresses the refrigerant cooled by the condenser; and an endotherm to the refrigerant decompressed by the decompression device. A dehumidifying means having a refrigerant circuit including, and dehydrating and removing moisture contained in the air by the evaporator,
A blower fan that sucks indoor air and blows dry air after passing through the evaporator;
Humidity detection means for detecting indoor humidity;
Control means for controlling the dehumidifying means and the blower fan so that the detected humidity detected by the humidity detecting means becomes a set humidity,
The control means is configured to execute a first control that changes the rotational speed per unit time of the compressor stepwise based on a difference between the detected humidity and the set humidity .
In the control means, the number of rotations per unit time of the compressor is stored in advance for each of a plurality of rank values corresponding to the range of the difference between the detected humidity and the set humidity.
The control means increases or decreases the rank value based on a difference between the detected humidity and the set humidity, thereby changing the rotation speed per unit time of the compressor in the first control stepwise. Dehumidifier configured to . Inverter circuit that converts DC voltage to AC voltage,
Wherein, in the first control, the inverter circuit by varying the frequency of the AC voltage is outputted, dehumidifier according to claim 1, stepwise changing the rotational speed per unit of compressor time . Wherein, in the first control, the revolutions per detected humidity and the set humidity and the unit difference is enough of the compressor less time is made controlled to be reduced stepwise according to claim 1 or The dehumidifier according to claim 2 . Temperature detecting means for detecting the temperature in the room,
Wherein, wherein when the detection temperature detected by the temperature detecting means is greater than the set temperature, it claims 1 to 3 comprising a first limiting means for limiting the rotational speed per unit of compressor time The dehumidifier according to any one of the above. 5. The dehumidifier according to claim 4 , wherein the first limiting unit performs control so that the number of rotations per unit time of the compressor decreases as the detected temperature increases. A water storage tank for storing water condensed by the dehumidifying means;
Water amount detecting means for detecting the amount of water stored in the water storage tank, and
The control means of claims 1 comprising a second limiting means for limiting the rotational speed per unit of compressor time when the detected amount of water detected by the water amount detecting means is equal to or more than a set amount of water according to claim 3 The dehumidifier according to any one of the above. The dehumidifier according to claim 6 , wherein the second restriction unit stops the compressor when the detected water amount becomes a water amount indicating full water. The said control means is comprised so that the 2nd control which controls the rotation speed per unit time of the said ventilation fan based on the difference of the said detected humidity and the said setting humidity may be comprised. The dehumidifier according to any one of 7 . Inverter circuit that converts DC voltage to AC voltage,
9. The dehumidifier according to claim 8 , wherein in the second control, the control unit varies the frequency of the AC voltage output from the inverter circuit to change the rotational speed per unit time of the blower fan in a stepwise manner. . Wherein, in the second control, the rotational speed per unit of time the blower fan as the difference decreases between the detected humidity and the set humidity is formed by controlled so reduced stepwise according to claim 8 or The dehumidifier according to claim 9 . Temperature detecting means for detecting the temperature in the room,
Wherein, when the detected temperature detected by said temperature detecting means is greater than the set temperature, it claims 10 claim 8 including a third limiting means for limiting the number of revolutions per unit time of the blowing fan The dehumidifier according to any one of the above. The dehumidifier according to claim 11 , wherein the third restriction unit performs control so that the number of revolutions per unit time of the blower fan decreases as the detected temperature increases. A water storage tank for storing water condensed by the dehumidifying means;
Water amount detecting means for detecting the amount of water stored in the water storage tank, and
Said control means of claim 10 claim 8 including a fourth limiting means for limiting the number of revolutions per unit time of the blowing fan when the water quantity detecting unit detecting the amount of water detected by is equal to or greater than a set amount of water The dehumidifier according to any one of the above. The dehumidifier according to claim 13 , wherein the fourth restriction unit stops the blower fan when the detected water amount becomes a water amount indicating full water.

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