TWI609157B - Dehumidifier - Google Patents

Description

dehumidifier

The present invention relates to a dehumidifier for dehumidifying moisture in a room.

Conventionally, for example, Patent Document 1 discloses a technique relating to control of a dehumidifier that can freely select and use a required humidity value. In this technique, if the humidity of the room is lower than the set humidity value, the compressor is stopped and only the blower is driven. Further, when the operation of the compressor is stopped and the humidity of the room exceeds the set humidity value, the operation of the compressor is resumed, and dehumidification in the room is performed.

[Prior patent documents] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. Hei 7-233999

In the prior art, after the humidity of the room reaches the set humidity, in order to keep the humidity of the room constant, the compressor is stopped and restarted. When the operation of the compressor is once stopped, the cooled refrigerant in the evaporator returns to room temperature. Therefore, in the prior art, when the compressor is restarted, the refrigerant in the evaporator is cooled, and the dehumidification of the indoor air cannot be performed, resulting in no effect. Further, large vibrations are generated at the time of starting and stopping of the compressor. Therefore, this conventional technique for performing the intermittent operation has a problem that the operation sound is increased and the life of the piping or the compressor motor is shortened due to vibration.

The present invention has been made in order to solve the above problems, and an object of the invention is to provide a dehumidifier that can achieve a set humidity while suppressing intermittent operation of a compressor.

The dehumidifier of the present invention includes: a dehumidifying means having a compressor that compresses the refrigerant, a condenser that cools the refrigerant compressed by the compressor, and a pressure reducing device that depressurizes the refrigerant cooled by the condenser, and The refrigerant circuit of the evaporator which has been depressurized by the pressure reducing device is dew condensation and removes the moisture contained in the air by the evaporator; the air supply fan is the dry air which is taken into the room and passed through the evaporator. The air is blown out to the room; the humidity detecting means detects the humidity in the room; and the control means controls the dehumidifying means and the air blowing fan to control the detected humidity detected by the humidity detecting means to become the set humidity; and the control means is configured to execute the first Control, and the first control changes the number of revolutions per unit time of the compressor in stages according to the difference between the detected humidity and the set humidity.

According to the present invention, since the control of the number of revolutions per unit time of the compressor is changed in stages based on the difference between the detected humidity and the set humidity, the humidity can be set while suppressing the intermittent operation of the compressor.

1‧‧‧Dehumidifier housing

2‧‧‧Inhalation

3‧‧‧Blowing out

4‧‧‧Humidity sensor

5‧‧‧temperature sensor

6‧‧‧Dehumidification means

7‧‧‧Water storage tank

8‧‧‧Water level sensor

9‧‧‧Air supply fan

10‧‧‧Control means

11‧‧‧Operation Department

12‧‧‧Compressor

13‧‧‧Condenser

14‧‧‧Capillary (pressure reduction device)

15‧‧‧Evaporator

16‧‧‧Frequency conversion circuit

Fig. 1 is a longitudinal sectional view showing the internal structure of a dehumidifier of the first embodiment.

Fig. 2 is a schematic configuration view showing the inside of the dehumidifier of the first embodiment.

Fig. 3 is a schematic configuration diagram showing the appearance of the dehumidifying means of the first embodiment.

Fig. 4 is a schematic configuration diagram showing a refrigerant circuit constituting the dehumidification means of the first embodiment.

Fig. 5 is a table showing the compressor frequency of each class of value memory compressor and the fan speed of the blower fan.

Fig. 6 is a flow chart showing the routine of the dehumidification operation performed by the control means in the first embodiment.

Fig. 7 is a table showing the operation of the dehumidification operation for detecting the temperature.

Fig. 8 is a table showing the operation of the dehumidification operation for detecting the amount of water.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or equivalent components are denoted by the same reference numerals, and the repeated description is appropriately simplified or omitted.

First embodiment

Fig. 1 is a longitudinal sectional view showing the internal structure of a dehumidifier of the first embodiment. In addition, Fig. 2 is a schematic configuration view showing the inside of the dehumidifier of the first embodiment. As shown in these figures, the dehumidifier of the present embodiment is configured by the following members, and the dehumidifier casing 1 can be constructed independently; the suction port 2 is for taking the indoor air A into the dehumidifier casing 1 The inside and the air outlet 3 discharge the dry air B from which the moisture has been removed from the dehumidifier casing 1 into the room.

As shown in Fig. 2, the dehumidifier of this embodiment includes: The humidity sensor 4 of the humidity detecting means detects the humidity of the indoor air A taken in from the suction port 2, and the temperature sensor 5 as a temperature detecting means detects the temperature of the indoor air A. In addition, in the following description, the humidity and temperature detected by the humidity sensor 4 and the temperature sensor 5 are respectively referred to as "detected humidity" and "detected temperature".

Further, the dehumidifier of the present embodiment includes a dehumidifying means 6 for removing moisture contained in the indoor air A to generate dry air B, and a water storage tank 7 for storing moisture removed from the indoor air A by the dehumidifying means 6. Further, the detailed configuration of the dehumidification means 6 will be described later.

A water level sensor 8 as a water amount detecting means for detecting the amount of water in the water storage tank 7 is provided 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".

The blower fan 9 is provided inside the dehumidifier casing 1. The blower fan 9 is configured to suck the indoor air A from the suction port 2 and introduce it into the dehumidifying means 6, and to generate an air flow that discharges the dry air B that has passed through the dehumidifying means 6 from the air outlet 3.

The dehumidifier of this embodiment includes a control means 10 and an operation unit 11. The operation unit 11 is used by the user to operate the dehumidifier, and the user inputs information such as selection of the dehumidification mode, input of the humidity, and the like. The control means 10 controls the operations of the dehumidifying means 6 and the blower fan 9 based on the detected values of the various sensors described above and the information input by the operation unit 11.

Next, the dehumidifying means 6 included in the dehumidifier of 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 Fig. 3, the dehumidification means 6 is compressed by compressing the refrigerant. The machine 12 cools the condenser 13 of the refrigerant pressurized by the compressor 12, the capillary 14 as a pressure reducing device for reducing the pressure of the refrigerant cooled by the condenser 13, and the refrigerant which is depressurized and expanded by the capillary 14. The evaporator 15 is configured to absorb heat.

Fig. 4 is a schematic configuration diagram showing a refrigerant circuit constituting the dehumidification means of the first embodiment. As shown in Fig. 4, the compressor 12, the condenser 13, the capillary tube 14, and the evaporator 15 described above are connected in series by piping, thereby constituting a refrigerant circuit. The control means 10 performs the dehumidification operation in the case where the switching operation of the operation unit 11 is detected until the dehumidification mode has been selected. In the dehumidification operation, specifically, the detection humidity detected by the humidity sensor 4 is set to the humidity set from the operation unit 11, and the blower fan 9 is rotated and the dehumidification means 6 is driven. When the blower fan 9 is driven, the indoor air A is taken into the dehumidification means 6 in the dehumidifier casing 1 from the suction port 2. In the dehumidification means 6, by driving the compressor 12, the refrigerant circulates in the refrigerant circuit. The indoor air A is dew condensation of moisture contained in the air when passing through the evaporator 15. The air system that has passed through the dehumidification means 6 is dehumidified to become dry air B, and is blown out from the air outlet 3 into the room.

Further, 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 conversion circuit (not shown) into an AC voltage of any voltage, frequency, and phase. The control means 10 controls the frequency conversion circuit 16 based on the inputs from the humidity sensor 4, the temperature sensor 5, the water level sensor 8, etc., and controls the frequency of the alternating voltage supplied to the compressor 12 and the blower fan 9, respectively. Become variable. More specifically, the control means 10 controls the inverter circuit 16 such that the compressor frequency (Hz) supplied from the compressor 12 becomes a desired frequency. Thereby, the compressor 12 is controlled to cause The number of revolutions per unit time (Hz) at the supplied compressor frequency (Hz). Moreover, the control means 10 controls the inverter circuit 16 so that the number of revolutions (rpm) per unit time of the blower fan 9 becomes a required number of revolutions. Here, the more the number of revolutions per unit time of the compressor 12 is, the larger the output becomes. Further, the more the number of revolutions per unit time of the blower fan 9 is, the larger the output becomes.

Next, the characteristic operation of the dehumidifier of the present embodiment will be described. The apparatus for controlling the compressor 12 and the blower fan 9 so as to detect the humidity as the set humidity as in the conventional dehumidifier, stops the dehumidification operation when the detected humidity reaches the set humidity. Further, when the detected humidity becomes higher than the set humidity later, the dehumidification operation is restarted. When the intermittent operation of the compressor 12 is frequently performed, there is a possibility that the life of various components is shortened due to an increase in the operation sound and vibration.

Therefore, in the dehumidifier of the present embodiment, the first control for variably setting the compressor frequency (Hz) of the compressor 12 of the dehumidification means 6 is performed in accordance with the difference (%) between the detected humidity and the set humidity in the dehumidification operation. And a second control that sets the number of revolutions per minute (rpm) of the blower fan 9 in a variable (segmentally changed) manner. In the control means 10, the compressor frequency and the fan rotational speed corresponding to the difference between the detected humidity and the set humidity are stored in the map for each level value. Fig. 5 is a table showing the compressor frequency of each class of value memory compressor 12 and the fan speed of the blower fan 9. In this table, the range of the difference between the set humidity and the detected humidity (%) is classified into a gradation value from 1 to 4, and the compressor frequency and the fan rotation speed are determined for each gradation value. The value assigned to each level value is determined by the value determined by the experiment, so that the difference between the humidity and the detected humidity is smaller, that is, the smaller the level value, the compressor frequency (Hz) and the fan speed (rpm) ) become the smaller value The way to set. When the dehumidification operation is performed using such a reflection table, the compressor frequency and the fan rotation speed are reduced stepwise as the detected humidity approaches the set humidity. The dehumidification capacity is smaller as the compressor frequency or fan speed is lower. Thereby, in the case where the detected humidity is much larger than the set humidity, the dehumidification capability is increased, and the detected humidity can be quickly brought close to the set humidity; and in the case where the detected humidity is close to the set humidity, the dehumidification operation can be continued while suppressing the dehumidification capability.

Next, a specific process of the dehumidifying operation performed by the dehumidifier of the present embodiment will be described in detail using a flowchart. Fig. 6 is a flow chart showing the routine of the dehumidification operation performed by the control means 10 in the first embodiment. Further, the routine shown in Fig. 6 is executed when the switching operation from the operation unit 11 is detected to the selected dehumidification mode.

At the start of the routine shown in Fig. 6, first, the humidity sensor 4 detects the humidity (step S2). Then, the gradation value shown in Fig. 5 is selected in response to the difference between the set humidity and the detected humidity set by the operation unit 11.

Next, based on the gradation value selected in the step S2, the initial operation operation of the dehumidification operation is determined (step S4). Here, specifically, the inverter circuit 16 is controlled to control the blower fan 9 and the compressor 12 based on the compressor frequency and the fan rotational speed corresponding to the gradation values shown in the map of FIG. In addition, the humidity of the system has changed drastically since the start of operation. Therefore, here, the operation is started in the initial operation operation three minutes after the start of the operation, so that the compressor 12 is prevented from frequently performing the intermittent operation and the motor is worn.

When the initial operation operation is performed for 3 minutes, the humidity is measured every 1 minute (step S6). Then, 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 below the set humidity, the air supply is stopped. The operation of the fan 9 and the compressor 12 (step S10). In the next step, the humidity is measured every 1 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 measurement of the humidity is performed again. On the other hand, when it is determined again that the detected humidity is higher than the set humidity, the process returns to step S4, and the dehumidification operation is restarted in response to the difference between the set humidity and the detected humidity.

On the other hand, in the step S8, in the case where the detected humidity is higher than the set humidity, the process proceeds to the next step, and the previous value of the detected humidity measured 1 minute ago is compared (that is, measured in the previous step S6). The humidity is detected, and the current value of the detected humidity (that is, the detected humidity measured at the current step S6) (step S16). As a result, in the case where it is determined that the detected humidity is higher than 1 minute before, the upgrade of the level value by one step is performed (step S18). As a result, for example, when the humidity rises due to the ventilation of the room or the like, since the output of the blower fan 9 and the compressor 12 is increased, the dehumidification of the room can be quickly performed.

Moreover, in this step S16, if it is determined that the detected humidity has not changed from 1 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 level value is not changed, and the process returns to the step S6, and the humidity measurement is performed. On the other hand, in the case where the detected humidity is not the same as the set humidity, the process proceeds to the next step, and the detected humidity is memorized, and it is determined whether or not the humidity is constant for three consecutive times (step S22). As a result, in the case where it is determined that the humidity does not continue for three consecutive times, the gradation value is not changed, and the process returns to the step S6, and the humidity measurement is performed. On the other hand, if it is determined that the humidity is constant for three consecutive times, the process proceeds to step S18, and the upgrade of the level value by one step is performed. Thereby, for example, In the state where the humidity of the room is not lowered, the output of the blower fan 9 and the compressor 12 can be increased, so that dehumidification of the room can be quickly performed.

Further, in the step S16, if it is determined that the detected humidity is more than 1 minute before, the process proceeds to the next step, and it is determined in step S18 whether or not the upgrade has been performed (step S24). As a result, when it is determined that the upgrade is not performed, the detected humidity and the set humidity are compared, and the gradation value shown in Fig. 5 is determined based on the difference in humidity (step S26). Here, specifically, when the humidity difference X between the detected humidity and the set humidity is initially 10%, 5%, 2%, or 0%, the level value is lowered by one step. Thereby, the gradation value can be gradually lowered as the detected humidity approaches the set humidity. Further, after changing to the determined level value, the process returns to the step S6, and the humidity measurement is performed. Further, in step S26, when the downgrade has been performed, the control means 10 memorizes the history. Thereby, the operation of controlling the level value can be controlled only once each time. Further, the history of the degradation recorded in the step S26 is reset in the process of step S30 which will be described later.

On the other hand, in the case where it is determined in the step S24 that the upgrade has been performed, 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, in the case where the detected humidity is not the same as the set humidity, the level value is not changed, and the process returns to the step S6, and the humidity measurement is performed. On the other hand, when the detected humidity system is the same as the set humidity, the level value is lowered by one step (step S30). Thereby, for example, when the humidity in the room becomes the set humidity, since the output of the blower fan 9 and the compressor 12 is lowered, it is possible to prevent the humidity from continuously decreasing after the set humidity is exceeded.

As shown in the above description, according to the dehumidifier of the embodiment, as the detected humidity approaches the set humidity, the compressor frequency and the fan speed are segmented. Reduced ground. Thereby, it is possible to suppress the intermittent operation of the blower fan 9 and the compressor 12 after the detected humidity reaches the set humidity. Thereby, the humidity of the room can be maintained at a constant value, and the noise caused by the intermittent operation and the life caused by the vibration of the compressor motor can be prevented.

Further, according to the dehumidifier of the first embodiment, the inverter circuit 16 including the variable frequency of the compressor 12 is controlled so that the frequency of the compressor 12 is gradually lowered as the humidity in the room is lowered, so that power consumption can be reduced.

In the dehumidifier of the first embodiment described above, the compressor 12 and the blower fan 9 are controlled by determining the gradation value based on the map shown in Fig. 5. However, the map of the determination level value is not limited to the one shown in Fig. 5. For example, the fan rotation speed may be switched, and the AC frequency for controlling the driving of the blower fan 9 may be set. Further, the values of the compressor frequency and the fan rotation speed corresponding to the respective gradation values are not limited to the values specified in Fig. 5, and may be appropriately set by an experiment or the like. Further, the number of the gradation values is not limited to four, and a plurality of gradation values may be set as long as they are plural.

Further, in the dehumidifier of the first embodiment, the number of revolutions of the blower fan 9 is controlled by using the inverter circuit 16, but the blower fan 9 may be variably controlled by using other well-known controls such as phase control and PWM control. Rotating speed.

Further, in the dehumidifier of the first embodiment described above, the capillary tube 14 is used as the pressure reducing device, but other well-known pressure reducing devices may be used.

Further, in the dehumidifier of the first embodiment, the first control for variably setting the compressor frequency of the compressor 12 and the second control for variably setting the fan rotation speed of the blower fan 9 are employed. Can also be used only A first control that variably sets the compressor frequency of the compressor 12 is performed.

Second embodiment

Next, a second embodiment of the present invention will be described with reference to Fig. 7. Further, the dehumidifier of the second embodiment can be realized by using the same configuration as that of the hardware shown in Figs. 1 to 4 .

In the dehumidifier of the first embodiment described above, the level value shown in Fig. 5 is determined in accordance with the difference between the set humidity and the detected humidity. In the dehumidifier of the second embodiment, the operation of setting the limit to the determined level value in accordance with the humidity of the indoor air A sucked from the suction port 2 is characterized. Fig. 7 is a table showing the operation of the dehumidification operation for detecting the temperature. In the dehumidifier of the second embodiment, when the dehumidification operation determines the gradation value, a predetermined restriction is placed on the map of Fig. 7. More specifically, in the map shown in Fig. 7, when the detected temperature detected by the temperature sensor 5 is 30 ° C or lower, it is determined based on the map shown in Fig. 5 described above. Rating value. Further, in the case where the detection temperature range is 31 ° C to 34 ° C, the gradation value is fixed to the level 2 irrespective of the map shown in Fig. 5 . Further, in the case where the detection temperature is 35 ° C or higher, the gradation value is fixed to the level 1 irrespective of the map shown in Fig. 5 . In this way, it is controlled that the higher the detected temperature, the less the number of revolutions per unit time of the compressor and the blower fan.

In the case of the dehumidification operation, the higher the temperature of the indoor air A, the higher the peripheral temperature of the compressor 12, and the higher the room temperature. According to the dehumidifier of the second embodiment, when the detected temperature is equal to or higher than the set temperature (here, 31 ° C), the output of the compressor 12 and the output of the blower fan 9 are restricted. The limit of the set temperature and the corresponding level value is considered to be the compressor 12 The relationship between the temperature and the temperature of the indoor air A may be set to a set temperature and a gradation value at which the compressor 12 does not excessively raise the temperature. Thereby, even if the temperature of the indoor air A is high, the temperature of the compressor 12 and the room temperature can be suppressed from rising. When the detected temperature is equal to or higher than the set temperature, the reason for limiting the output of the blower fan 9 is to change the output of the blower fan 9 by the output of the compressor 12, and the dehumidification capability can be controlled in a highly balanced manner. That is, since the temperature rise of the refrigerant compressed by the output of the compressor 12 is suppressed, the dehumidification capability can be controlled in a highly balanced manner as the cooling capacity of the condenser 13 is suppressed, that is, the output of the blower fan 9 is suppressed. . Further, when the output of the compressor 12 is reduced, the noise generated from the compressor 12 is also reduced, and the noise generated from the blower fan 9 is suppressed as the output of the blower fan 9 is suppressed, whereby the dehumidifier can be suppressed. Overall noise.

Further, 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 revolutions per unit time of the compressor 12 is restricted, thereby realizing the "first" of the present invention. The "restriction means" realizes the "third restriction means" of the present invention by limiting the output of the blower fan 9, that is, the number of revolutions per unit time of the blower fan 9, when the detected temperature is equal to or higher than the set temperature. Further, the first restriction means and the third restriction means may be configured to be executed by only one of them.

Third embodiment

Next, a third embodiment of the present invention will be described with reference to Fig. 8. Further, the dehumidifier of the third embodiment can be realized by using the same configuration as that of the hardware shown in Figs. 1 to 4 .

The dehumidifier of the first embodiment described above is adapted to Set the difference between the humidity and the detected humidity to determine the level value shown in Figure 5. In the dehumidifier of the third embodiment, it is characteristic that an operation for limiting the determined level value is made in accordance with the amount of water in the water storage tank 7. Fig. 8 is a table showing the operation of the dehumidification operation for detecting the amount of water. In the dehumidifier of the third embodiment, when the dehumidification operation determines the gradation value, a predetermined restriction is placed on the map of Fig. 8. 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 map shown in Fig. 5 is used. Determine the rating value. In addition, when the water amount is set to be equal to or greater than the water amount, the level value is fixed to level 1 regardless of the map shown in Fig. 5. Thereby, the output of the compressor 12 and the output of the blower fan 9 in the dehumidification operation are limited. Further, when the amount of water is detected to indicate the amount of water in the full water level, the dehumidifying operation is stopped. The restriction of the water amount and the corresponding gradation value is set so that the water storage tank 7 does not become the set water amount and the gradation value of the full water level in consideration of the capacity of the water storage tank 7 and the dehumidification capacity. Thereby, the output of the compressor 12 and the output of the blower fan 9 of the dehumidification operation can be restricted before the water storage tank 7 becomes a full water level, and the dehumidification operation can be prevented after the water storage tank 7 becomes a full water level.

Further, in the dehumidifier of the third embodiment, when the detected amount of water is equal to or greater than the set amount of water, the output of the compressor 12 is restricted, and the "second restricting means" of the present invention is realized, and the amount of water is set as the set amount of water. In the above case, the output of the blower fan 9 is restricted, and the "fourth restriction means" of the present invention is realized. Further, the second restriction means and the fourth restriction means may be configured to be executed by only one of them.

1‧‧‧Dehumidifier housing

2‧‧‧Inhalation

3‧‧‧Blowing out

4‧‧‧Humidity sensor

5‧‧‧temperature sensor

6‧‧‧Dehumidification means

7‧‧‧Water storage tank

8‧‧‧Water level sensor

9‧‧‧Air supply fan

10‧‧‧Control means

11‧‧‧Operation Department

A‧‧‧ indoor air

B‧‧‧dry air

Claims (15)

A dehumidifier comprising: a dehumidifying means having a compressor including a compressor for compressing a refrigerant, a condenser for cooling a refrigerant compressed by the compressor, and a pressure reducing device for reducing a refrigerant cooled by the condenser, and a refrigerant circuit for an evaporator that absorbs heat from a refrigerant that has been depressurized by the pressure reducing device, by which the moisture contained in the air is dew condensation and removed; and the air supply fan draws air into the chamber and passes the evaporator The dry air is blown out to the room; the humidity detecting means detects the humidity in the room; and the control means controls the dehumidifying means and the air blowing fan to control the detected humidity detected by the humidity detecting means to become the set humidity; The control means is configured to perform the first control, and the first control changes the number of revolutions per unit time of the compressor in a range greater than 0 according to the difference between the detected humidity and the set humidity. For example, the dehumidifier of claim 1 includes a frequency conversion circuit that converts a direct current voltage into an alternating current voltage; the control means is in the first control, so that the frequency of the alternating current voltage output by the frequency conversion circuit is variable, and The number of revolutions per unit time of the compressor is changed stepwise. The dehumidifier of claim 1 or 2, wherein the control means is in the first control, the control is such that the difference between the detected humidity and the set humidity is smaller, and the number of revolutions per unit time of the compressor is The less the segment becomes. The dehumidifier of claim 1 or 2, comprising a temperature detecting means for detecting a temperature in the room; the controlling means comprising a first limiting means, wherein the first limiting means is detected by the temperature detecting means When the detected temperature is higher than the set temperature, the number of revolutions per unit time of the compressor is limited. The dehumidifier of claim 4, wherein the first restriction means that the higher the detection temperature is, the less the number of revolutions per unit time of the compressor becomes. The dehumidifier of claim 1 or 2, comprising: a water storage tank for storing moisture dewed by the dehumidification means; and a water quantity detecting means for detecting the amount of water stored in the water storage tank; the control The means includes a second restricting means for limiting the number of revolutions per unit time of the compressor when the detected amount of water detected by the water amount detecting means is equal to or greater than the set amount of water. The dehumidifier of claim 6, wherein the second restricting means stops the compressor when the detected amount of water becomes the amount of water indicating the full water level. The dehumidifier of claim 1 or 2, wherein the control means is configured to perform a second control, wherein the second control controls each unit of the blower fan according to a difference between the detected humidity and the set humidity. The number of revolutions of time. For example, the dehumidifier of claim 8 includes a frequency conversion circuit for converting a direct current voltage into an alternating current voltage; The control means is based on the second control such that the frequency of the alternating voltage outputted by the frequency conversion circuit is variable, and the number of revolutions per unit time of the blower fan is changed in stages. The dehumidifier of claim 8, wherein the control means is controlled by the second control, and the difference between the detected humidity and the set humidity is controlled, and the number of revolutions per unit time of the air blowing fan is segmented. The less it becomes. The dehumidifier of claim 8, which comprises a temperature detecting means for detecting a temperature in the room; the control means comprises a third limiting means, wherein the third limiting means is detected by the temperature detecting means When the temperature is higher than the set temperature, the number of revolutions per unit time of the blower fan is limited. The dehumidifier of claim 11, wherein the third limiting means controls that the higher the detected temperature, the less the number of revolutions per unit time of the blower fan becomes. For example, the dehumidifier of claim 8 includes: a water storage tank for storing moisture dewed by the dehumidification means; and a water quantity detecting means for detecting the amount of water stored in the water storage tank; the control means is The fourth restricting means is configured to limit the number of revolutions per unit time of the blower fan when the detected amount of water detected by the water amount detecting means is equal to or greater than the set amount of water. The dehumidifier of claim 13, wherein the fourth restricting means stops the blower fan when the detected amount of water becomes the amount of water indicating the full water level. For example, the dehumidifier of claim 1 of the patent scope, wherein the control means is for each a plurality of grading values corresponding to the difference between the humidity and the set humidity, and pre-memorizing the number of revolutions per unit time of the compressor, the control means increasing or decreasing the gradation value according to the difference between the detected humidity and the set humidity Thereby, the number of revolutions per unit time of the compressor in the first control is changed in sections.