NZ726665B2 - Dehumidifier - Google Patents

Abstract

Provided is a dehumidifier that can achieve a set humidity while suppressing intermittent operation of a compressor. The dehumidifier comprises: a dehumidifying means that has a refrigerant circuit including a compressor for compressing a refrigerant, a condenser for cooling the compressed refrigerant, a capillary tube for reducing the pressure of the cooled refrigerant, and an evaporator for causing the pressure-reduced refrigerant to absorb heat, said dehumidifying means removing moisture contained in the air by condensing the moisture with the evaporator; a blower fan that draws in air from the room and blows into the room dry air that has passed through the evaporator; a humidity sensor that detects the humidity in the room; and a control means for controlling the compressor of the dehumidifying means and the blower fan so that the detected humidity detected by the humidity sensor is a set humidity. The control means controls the compressor frequency so that the rotations of the compressor per unit time decrease in stages as the difference between the detected humidity and the set humidity becomes smaller. nt, a capillary tube for reducing the pressure of the cooled refrigerant, and an evaporator for causing the pressure-reduced refrigerant to absorb heat, said dehumidifying means removing moisture contained in the air by condensing the moisture with the evaporator; a blower fan that draws in air from the room and blows into the room dry air that has passed through the evaporator; a humidity sensor that detects the humidity in the room; and a control means for controlling the compressor of the dehumidifying means and the blower fan so that the detected humidity detected by the humidity sensor is a set humidity. The control means controls the compressor frequency so that the rotations of the compressor per unit time decrease in stages as the difference between the detected humidity and the set humidity becomes smaller.

Description

Description Title of Invention DEHUMIDIFIER Technical Field The t invention relates to a dehumidifier that dehumidifies a room.

Background Art Conventionally, for example, PTL 1 discloses a technology ng to control of a dehumidifier capable of arbitrarily selecting a desired humidity value. In this technology, if a ty of a room decreases below a set ty value, a compressor is stopped and only a blower is driven. If the stop of an operation of the compressor increases the ty of the room above the set humidity, the operation of the compressor is restarted to dehumidify the room.

Citation List Patent Literature [PTL 1] JP 7-233999 A In this specification where reference has been made to patent specifications, other external documents, or other sources of information, this is generally for the purpose of ing a context for discussing the features of the invention. Unless specifically stated otherwise, reference to such external documents is not to be construed as an admission that such documents, or such s of information, in any iction, are prior art, or form part of the common general knowledge in the art.

Technical Problem In the above conventional technology, after the humidity of the room reaches the set humidity, the operation of the compressor is repeatedly stopped and ted in order to maintain a constant humidity in the room. If the operation of the compressor is once stopped, a cooled refrigerant in an evaporator returns to a room temperature. Thus, in the above conventional technology, when the operation of the compressor is restarted, indoor air cannot be dehumidified until the refrigerant in the evaporator is cooled, which is ineffective. Also, large vibration occurs on activation and stop of the compressor.

Thus, in the above conventional logy of performing an intermittent operation, an increase in operation noise and vibration may reduce life of a pipe or a compressor motor.

The present invention is achieved to solve the above described problem, and has an object to provide a dehumidifier capable of achieving a set humidity while ssing an intermittent operation of a compressor. An additional or alternative object of the t invention is to provide the public with a useful choice.

Solution to Problem A dehumidifier according to the present invention includes: dehumidifying means including a refrigerant circuit ing a compressor for compressing a refrigerant, a condenser for cooling the refrigerant compressed by the compressor, a decompression device for reducing pressure of the erant cooled by the condenser, and an evaporator for absorbing heat into the erant reduced in re by the decompression device, the dehumidifying means condensing and removing moisture contained in air using the evaporator; a blower fan that sucks air from a room and blows into the room dry air having passed through the evaporator; humidity detecting means for detecting a humidity in the room; and l 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, wherein the control means is configured to perform first control to vary in stages a rotation frequency of the ssor per unit time based on a difference between the detected humidity and the set humidity, wherein the control means previously stores the rotation frequency of the compressor per unit time for each of a plurality of rank values corresponding to a range of a difference between the detected ty and the set humidity, and the control means is ured to vary in stages the on frequency of the compressor per unit time by sing or increasing the rank value based on the difference between the detected humidity and the set humidity.

Advantageous Effect of Invention According to the present invention, control is performed to vary in stages a rotation frequency of a compressor per unit time based on a difference between a detected humidity and a set humidity, thereby achieving the set ty while suppressing an intermittent operation of the compressor.

Brief Description of gs Fig. 1 is a vertical sectional view of an internal configuration of a dehumidifier according to Embodiment 1.

Fig. 2 is a schematic configuration diagram of an inside of the dehumidifier according to Embodiment 1.

Fig. 3 is a schematic configuration diagram of an appearance of dehumidifying means ing to Embodiment 1.

Fig. 4 is a schematic configuration diagram of a refrigerant circuit that constitutes the dehumidifying means according to Embodiment 1.

Fig. 5 is a map that stores a compressor ncy of a compressor and a fan rotation frequency of a blower fan for each rank value.

Fig. 6 is a flowchart showing a routine of a dehumidifying operation performed by control means in ment 1.

Fig. 7 is a map that defines a dehumidifying operation motion for a detected temperature.

Fig. 8 is a map that defines a dehumidifying operation motion for a ed amount of water.

Description of Embodiments Now, embodiments of the present invention will be described with nce to the drawings. Throughout the drawings, the same or corresponding parts are denoted by the same nce numerals, and overlapping descriptions are simplified or omitted as appropriate.

Embodiment 1 Fig. 1 is a vertical sectional view of an internal configuration of a dehumidifier according to Embodiment 1. Fig. 2 is a schematic configuration diagram of an inside of the dehumidifier according to Embodiment 1. As shown in the figures, an outside of the dehumidifier of the t invention includes a self-supporting dehumidifier housing 1, an inlet 2 for taking indoor air A into the dehumidifier housing 1, and an outlet 3 for discharging dry air B from which moisture is removed from the dehumidifier g 1 into a room.

As shown in Fig. 2, the dehumidifier according to this embodiment includes a humidity sensor 4 as humidity detecting means for detecting a humidity of the indoor air A sucked from the inlet 2, and a temperature sensor 5 as temperature detecting means for ing a temperature of the indoor air A. In the description below, the humidity and the temperature detected by the humidity sensor 4 and the ature sensor 5 are referred to as "detected humidity" and "detected temperature", respectively.

The dehumidifier ing to this embodiment also includes dehumidifying means 6 for removing moisture contained in the indoor air A to produce dry air B, and a water storage tank 7 for storing the moisture removed from the indoor air A by the difying means 6. A detailed configuration of the dehumidifying means 6 will be described later.

The water storage tank 7 is ed with a water level sensor 8 as water amount detecting means for detecting an amount of water in the water storage tank 7. In the description below, the amount of water detected by the water level sensor 8 is referred to as "detected amount of water".

In the dehumidifier housing 1, a blower fan 9 is provided. The blower fan 9 sucks and introduces the indoor air A from the inlet 2 into the dehumidifying means 6, and generates an airflow for discharging the dry air B having passed h the dehumidifying means 6 out of the outlet 3.

The dehumidifier according to this embodiment includes control means 10 and an operation n 11. The operation portion 11 is used by a user to operate the difier and input information such as a choice of a dehumidification mode or an input of a set humidity. The control means 10 controls operations of the dehumidifying means 6 and the blower fan 9 based on detected values from the various sensors described above and the ation input to the operation portion 11.

Next, the dehumidifying means 6 included in the dehumidifier according to this embodiment will be described. Fig. 3 is a schematic configuration diagram of an appearance of the dehumidifying means according to Embodiment 1. As shown in Fig. 3, the dehumidifying means 6 includes a compressor 12 for compressing a refrigerant, a condenser 13 for cooling the erant increased in pressure by the compressor 12, a capillary tube 14 as a decompression device for reducing pressure of and expanding the refrigerant cooled by the condenser 13, and an evaporator 15 for absorbing heat into the refrigerant reduced in pressure and expanded by the capillary tube 14.

Fig. 4 is a schematic configuration diagram of a refrigerant circuit that constitutes the dehumidifying means according to Embodiment 1. As shown in Fig. 4, the compressor 12, the condenser 13, the capillary tube 14, and the ator 15 described above are tially connected by a pipe to constitute a refrigerant circuit. The control means 10 performs a dehumidifying operation when detecting that a dehumidification mode is ed by a switch operation of the operation portion 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 is the set humidity input from the operation portion. When the blower fan 9 is , the indoor air A is taken from the inlet 2 into the dehumidifying means 6 in the dehumidifier housing 1. In the dehumidifying means 6, the compressor 12 is driven and thus the refrigerant is circulated in the refrigerant circuit. Moisture contained in the indoor air A is sed while the air passing through the evaporator 15. The air having passed through the dehumidifying means 6 is dified into the dry air B, which is blown out of the outlet 3 into the room.

Also, as shown in Fig. 4, the control means 10 includes an inverter circuit 16.

The inverter circuit 16 is a circuit for converting a DC voltage converted by a converter circuit (not shown) into an AC voltage of any 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, or the like, and variably controls a frequency of an AC voltage ed to the compressor 12 and the blower fan 9. More specifically, the control means 10 controls the inverter circuit 16 so that a compressor frequency (Hz) supplied to the compressor 12 is a requested ncy.

Thus, the compressor 12 is controlled to a rotation frequency (Hz) per unit time according to the supplied compressor frequency (Hz). Also, the control means 10 controls the inverter circuit 16 so that a rotation ncy (rpm) of the blower fan 9 per unit time is a requested rotation frequency. Here, an output of the compressor 12 increases with increasing rotation frequency per unit time. Also, an output of the blower fan 9 increases with increasing rotation frequency per unit time.

Next, a characteristic operation of the dehumidifier according to this ment will be described. In a device like a conventional dehumidifier in which a compressor 12 and a blower fan 9 are controlled so that a detected humidity becomes a set humidity, a difying operation is stopped when the detected ty reaches the set humidity. Then, when the detected humidity again becomes higher than the set humidity, the dehumidifying ion is ted. If such an intermittent operation of the compressor 12 is frequently performed, problems may occur such as increased operation noise and reduced life of various parts due to vibration.

Then, the dehumidifier according to this embodiment ms, in the dehumidifying operation, first control to variably set a compressor frequency (Hz) of the compressor 12 in the dehumidifying means 6, and second control to variably set (so as to vary in stages) a rotation frequency (rpm) per minute of the blower fan 9 depending on a difference (%) between the detected humidity and the set humidity. The control means includes a map that stores a compressor frequency and a fan rotation frequency corresponding to the difference between the detected humidity and the set humidity for each rank value. Fig. 5 shows a map that stores a compressor frequency of the compressor 12 and a fan rotation frequency of the blower fan 9 for each rank value.

This map includes rank values 1 to 4 classified according to a range of the difference (%) of the detected humidity from the set humidity, and the compressor frequency and the fan rotation frequency are defined for each rank value. The values ated with each rank value are previously defined by an experiment or the like, and are set so that the ssor frequency (Hz) and the fan rotation frequency (rpm) decrease with decreasing difference of the detected humidity from the set humidity, that is, with decreasing rank value. Performing the dehumidifying operation using such a map causes the compressor frequency and the fan rotation frequency to decrease in stages as the detected ty is closer to the set humidity. A dehumidification capability decreases with decreasing compressor frequency or fan rotation frequency. Thus, when the ed humidity is iently higher than the set humidity, the dehumidification capability can be increased to quickly bring the detected humidity closer to the set humidity, while when the ed humidity is close to the set humidity, the dehumidification capability can be reduced to continue the dehumidifying ion.

Next, a specific dehumidifying operation performed by the dehumidifier according to this ment will be described in detail using a flowchart. Fig. 6 is a flowchart showing a routine of a difying operation performed by the control means 10 in Embodiment 1. The routine shown in Fig. 6 is performed when the control means 10 detects that the dehumidification mode is selected by a switch operation of the operation n 11.

When the routine shown in Fig. 6 is started, the humidity sensor 4 first detects a humidity (step S2). Then, a rank value shown in Fig. 5 is selected ing on a difference n the set ty and the detected humidity set by the operation portion 11.

Next, an initial operation motion of the dehumidifying operation is determined based on the rank value selected in step S2 above (step S4). Here, specifically, the inverter circuit 16 is controlled to control the blower fan 9 and the compressor 12 according to the compressor frequency and the fan rotation frequency corresponding to the rank value shown in the map in Fig. 5. The humidity significantly varies immediately after the start of the operation. Thus, here, the ion is performed in the initial operation motion for three minutes immediately after the start of the operation, thereby preventing frequent occurrence of the intermittent operation of the compressor 12 and wear of a motor.

The initial operation motion is performed for three minutes, and then the ty is measured every minute (step S6). Then, it is determined whether the detected humidity is the set humidity or lower (step S8). When the detected humidity is the set ty or lower, the operations of the blower fan 9 and the compressor 12 are stopped (step S10). In the next step, the humidity is measured every minute (step S12). Then, it is determined whether the detected humidity is higher than the set humidity (step S14).

When it is determined that the detected humidity is the set humidity or lower, the process returns to step S12, and the humidity is again measured. On the other hand, when it is determined that the detected humidity again becomes higher than the set humidity, the process returns to step S4, and the initial operation motion is again started depending on the difference between the detected ty and the set humidity.

In step S8 above, when the detected humidity is higher than the set humidity, the process moves to the next step, and a previous value of the detected humidity measured one minute before (that is, the detected humidity measured in step S6 last time) is compared with a current value of the detected ty (that is, the detected humidity measured in step S6 this time) (step S16). When it is determined that the detected humidity is higher than that of one minute before, the rank value is sed by one grade (step S18). Thus, for e, when ventilation of the room or the like increases the ty, outputs of the blower fan 9 and the compressor 12 are increased, thereby allowing quick dehumidification of the room.

In step S16 above, when it is ined that the ed humidity has not changed for one minute, the process moves to the next step, and it is determined whether or not the detected humidity is equal to the set humidity (step S20). When the detected humidity is equal to the set humidity, the process returns to step S6 above t changing the rank value, and the humidity is again measured. On the other hand, when the detected humidity is not equal to the set humidity, the process moves to the next step, the detected humidity is stored, and it is ined whether or not a state without any change in humidity is repeated three times (step S22). When it is determined that the state t any change in humidity is not repeated three times, the process returns to step S6 above without changing the rank value, and the humidity is again measured. On the other hand, when it is determined that the state without any change in humidity is repeated three times, the process moves to step S18 above, and the rank value is increased by one grade. Thus, for e, a state t a decrease in humidity in the room can be determined to increase the outputs of the blower fan 9 and the compressor 12, thereby allowing quick dehumidification of the room.

Further, in step S16 above, when it is determined that the detected humidity is lower than that of one minute before, the process moves to the next step, and it is determined whether or not the rank value is increased in step S18 above (step S24).

When it is determined that the rank value is not increased, the detected humidity is compared with the set humidity, and the rank value in Fig. 5 is determined based on the difference in humidity (step S26). Here, ically, the rank value is sed by one grade when the humidity difference X between the detected humidity and the set humidity first reaches 10%, 5%, 2%, and 0%, respectively. Thus, the rank value can be decreased in stages as the detected humidity is closer to the set ty. After a change to the determined rank value, the process returns to step S6 above, and the humidity is again measured. When the rank value is decreased in step S26, the control means 10 stores the y. This allows control such that an operation of decreasing the rank value is performed only once for each grade. The history of the decrease in rank value stored in step S26 above is reset in a process of step S30 described later.

When it is determined in step S24 above that the rank value is increased, the process moves to the next step, and it is determined whether or not the detected humidity is equal to the set humidity (step S28). When the detected humidity is not equal to the set humidity, the s returns to step S6 above without changing the rank value, and the humidity is again measured. On the other hand, when the detected humidity is equal to the set humidity, the rank value is decreased by one grade (step S30). Thus, for example, when the humidity in the room becomes the set ty, the outputs of the blower fan 9 and the compressor 12 can be reduced, thereby preventing the humidity from continuously decreasing below the set humidity.

As described above, with the dehumidifier ing to this ment, the rank value is decreased in stages as the detected humidity is closer to the set humidity. This can suppress the detected humidity reaching the set humidity to cause the intermittent operation of the blower fan 9 and the compressor 12. This can maintain a constant humidity in the room, and prevent noise due to the intermittent ion and reduced life due to vibration of the compressor motor.

The dehumidifier according to Embodiment 1 includes the inverter circuit 16 that vary the frequency of the compressor 12 and ms control to reduce in stages the frequency of the ssor 12 with decreasing humidity in the room, thereby reducing power consumption.

In the dehumidifier according to Embodiment 1 above, the rank value is ined according to the map shown in Fig. 5 to control the compressor 12 and the blower fan 9. However, the map for determining the rank value is not limited to that shown in Fig. 5, but for example, instead of the fan rotation frequency, an AC frequency for controlling driving of the blower fan 9 may be set. Values of the compressor frequency and the fan rotation frequency corresponding to each rank value are not limited to those defined in Fig. 5, but optimum values may be set by experiment or the like as appropriate. The number of rank values is not limited to four, but more than four rank values may be set.

In the dehumidifier according to Embodiment 1 bed above, the inverter circuit 16 is used to control the rotation frequency of the blower fan 9, but other known controls such as phase control or PMW control may be used to variably control the rotation frequency of the blower fan 9.

In the dehumidifier according to Embodiment 1 described above, the capillary tube 14 is used as the decompression device, but other known decompression s may be used.

The dehumidifier according to Embodiment 1 described above performs both the first control to variably set the compressor frequency of the ssor 12 and the second control to ly set the fan rotation frequency of the blower fan 9, but may perform only the first control to variably set the compressor frequency of the compressor Embodiment 2 Next, with reference to Fig. 7, Embodiment 2 according to the present invention will be described. The dehumidifier according to Embodiment 2 can be achieved using the same configuration as the hardware configuration shown in Figs. 1 to 4.

In the dehumidifier according to Embodiment 1 described above, the rank value shown in Fig. 5 is determined depending on the difference between the detected ty and the set humidity. The dehumidifier according to Embodiment 2 has a feature in an operation of limiting a determined rank value depending on a temperature of indoor air A sucked from an inlet 2. Fig. 7 shows a map that defines a dehumidifying operation motion for a detected temperature. The dehumidifier according to Embodiment 2 has limits defined in the map in Fig. 7 when a rank value is determined in a dehumidifying operation. More specifically, in the map shown in Fig. 7, when the detected temperature detected by a temperature sensor 5 is 30°C or lower, the rank value is determined according to the map shown in Fig. 5 described above. When the detected ature is 31°C to 34°C, the rank value is fixed to rank 2 irrespective of the map shown in Fig. 5.

Further, when the detected temperature is 35°C or higher, the rank value is fixed to rank 1 irrespective of the map shown in Fig. 5. As such, control is performed so that rotation ncy of a compressor and a blower fan per unit time se with increasing ed temperature.

When the dehumidifying operation is performed, an outer shell temperature of the compressor 12 increases with increasing temperature of the indoor air A, and a room temperature increases along ith. With the dehumidifier ing to Embodiment 2, when the detected ature is the set temperature (31°C here) or higher, an output of the compressor 12 and an output of the blower fan 9 are limited. For the set temperature and the limit of the rank value corresponding thereto, a set ature and a rank value may be set such that the compressor 12 is not excessively increased in temperature in view of a relationship between the temperature of the compressor 12 and the temperature of the indoor air A. Thus, even if the temperature of the indoor air A is high, the ature of the compressor 12 and the room temperature can be prevented from increasing. The output of the blower fan 9 is limited when the detected temperature is the set temperature or higher because changing the output of the blower fan 9 according to the output of the compressor 12 allows control of a dehumidification capability in a balanced manner. Specifically, reducing the output of the compressor 12 suppresses an increase in temperature of a compressed refrigerant, and thus reducing a cooling capability of the condenser 13 along therewith, that is, reducing the output of the blower fan 9 allows control of the dification capability in a more balanced manner. Further, reducing the output of the ssor 12 reduces noise generated from the compressor 12, and reducing the output of the blower fan 9 along therewith to reduce noise generated from the blower fan 9 can reduce noise of the entire dehumidifier.

In the dehumidifier according to Embodiment 2, when the detected temperature is the set temperature or higher, the output of the ssor 12, that is, the rotation frequency of the compressor 12 per unit time is limited, thereby ing "first limiting means" of the present ion. When the ed temperature is the set temperature or higher, the output of the blower fan 9, that is, the rotation frequency of the blower fan 9 per unit time is limited, thereby achieving "third limiting means" of the present invention. The first ng means and the third limiting means may be configured so that either thereof is med.

Embodiment 3 Next, with nce to Fig. 8, Embodiment 3 of the present invention will be described. A dehumidifier according to Embodiment 3 can be achieved using the same configuration as the hardware configuration shown in Figs. 1 to 4.

In the dehumidifier according to Embodiment 1 described above, the rank value shown in Fig. 5 is determined depending on the difference between the detected humidity and the set humidity. The dehumidifier according to ment 3 has a feature in an ion of limiting a determined rank value depending on an amount of water in a water storage tank 7. Fig. 8 is a map that defines a dehumidifying operation motion for a ed amount of water. The dehumidifier according to Embodiment 3 has limits defined in the map in Fig. 8 when a rank value is determined in a dehumidifying operation. More specifically, in the map shown in Fig. 8, when a detected amount of water detected by a water level sensor 8 is smaller than a set amount of water, the rank value is determined according to the map in Fig. 5 described above. When the detected amount of water is the set amount of water or larger, the rank value is fixed to rank 1 irrespective of the map shown in Fig. 5. This limits an output of a compressor 12 and an output of a blower fan 9 in the dehumidifying operation. Further, when the detected amount of water is an amount of water indicating a full water level, the dehumidifying operation is stopped. For the set amount of water and the limit of the rank value corresponding thereto, a set amount of water and a rank value may be set such that the water storage tank 7 is not filled with water in view of a ty of the water storage tank 7 and a dehumidification capability. Thus, the output of the compressor 12 and the output of the blower fan 9 in the dehumidifying operation can be limited before the water storage tank 7 is filled with water, thereby preventing the dehumidifying operation from being continued even after the water storage tank 7 is filled with water.

In the dehumidifier according to Embodiment 2, when the ed amount of water is the set amount of water or larger, the output of the ssor 12 is limited, thereby achieving "second limiting means" of the present ion. When the detected amount of water is the set amount of water or larger, the output of the blower fan 9 is limited, thereby achieving "fourth limiting means" of the present invention. The second limiting means and the fourth limiting means may be configured so that either thereof is performed.

The term “comprising” as used in this specification and claims means “consisting at least in part of”. When interpreting statements in this specification and claims which include the term “comprising”, other es besides the features prefaced by this term in each statement can also be present. Related terms such as “comprise” and “comprised” are to be reted in a similar manner.

Reference Signs List 1 dehumidifier housing 2 inlet 3 outlet 4 humidity sensor temperature sensor 6 difying means 7 water storage tank 8 water level sensor 9 blower fan control means 11 operation portion 12 compressor 13 condenser 14 capillary tube (decompression device) evaporator 16 inverter circuit

Claims (15)

Claims
1. [Claim 1] A dehumidifier comprising: dehumidifying means including a refrigerant circuit including a compressor for compressing a refrigerant, a condenser for cooling the refrigerant compressed by the compressor, a decompression device for reducing pressure of the refrigerant cooled by the condenser, and an evaporator for absorbing heat into the refrigerant reduced in pressure by the decompression device, the dehumidifying means condensing and removing moisture contained in air using the evaporator; a blower fan that sucks air from a room and blows into the room dry air having passed h the evaporator; humidity detecting means for detecting a humidity in a room; and control means for controlling the dehumidifying means and the blower fan so that the detected humidity detected by the humidity ing means becomes a set humidity, wherein the control means is configured to perform first control to vary in stages a rotation frequency of the compressor per unit time based on a difference between the ed humidity and the set humidity, wherein the control means previously stores the rotation frequency of the compressor per unit time for each of a ity of rank values corresponding to a range of a ence between the detected humidity and the set humidity, and the control means is configured to vary in stages the on ncy of the compressor per unit time by decreasing or increasing the rank value based on the ence between the detected humidity and the set humidity.
2. [Claim 2] The dehumidifier according to claim 1, comprising an inverter circuit for converting a DC voltage into an AC voltage, wherein the control means vary in stages the rotation frequency of the compressor per unit time in the first control means by varying a frequency of the AC e outputted by the inverter circuit.
3. [Claim 3] The dehumidifier according to claim 1 or 2, wherein the control means performs control so that the rotation frequency of the ssor per unit time decreases in stages with decreasing difference n the detected humidity and the set humidity in the first control.
4. [Claim 4] The dehumidifier according to any one of claims 1 to 3, comprising ature detecting means for detecting a temperature in a room, wherein the control means includes first ng means for limiting the on frequency of the compressor per unit time when the detected temperature detected by the temperature detecting means is higher than a set temperature.
5. [Claim 5] The dehumidifier according to claim 4, wherein the first limiting means performs control so that the rotation frequency of the compressor per unit time decreases in stages with increasing detected temperature.
6. [Claim 6] The dehumidifier according to any one of claims 1 to 3, comprising: a water storage tank for storing moisture sed by the dehumidifying means; water amount detecting means for detecting an amount of water of the re stored in the water storage tank, wherein the control means includes second limiting means for limiting the on frequency of the compressor per unit time when the detected amount of water detected by the water amount detecting means is a set amount of water or .
7. [Claim 7] The dehumidifier according to claim 6, wherein the second limiting means stops the compressor when the ed amount of water is an amount of water indicating a full water level.
8. [Claim 8] The dehumidifier according to any one of claims 1 to 7, wherein the control means is configured to perform second control to control a rotation frequency of the blower fan per unit time based on the difference between the detected humidity and the set humidity.
9. [Claim 9] The dehumidifier according to claim 8, comprising an inverter circuit for converting a DC voltage into an AC voltage, wherein the control means vary in stages the rotation frequency of the blower fan per unit time in the second control by varying a frequency of the AC voltage output by the inverter circuit.
10. [Claim 10] The dehumidifier according to claim 8 or 9, wherein the control means performs control so that the rotation frequency of the blower fan per unit time decreases in stages with sing difference between the detected ty and the set humidity in the second control.
11. [Claim 11] The dehumidifier according to any one of claims 8 to 10, comprising temperature ing means for detecting a temperature in a room, n the control means includes third limiting means for limiting the rotation frequency of the blower fan per unit time when the detected temperature detected by the temperature detecting means is higher than a set temperature.
12. [Claim 12] The dehumidifier according to claim 11, wherein the third limiting means performs control so that the rotation frequency of the blower fan per unit time decreases in stages with sing detected temperature.
13. [Claim 13] The dehumidifier according to any one of claims 8 to 10, comprising: a water storage tank for g re condensed by the dehumidifying means; water amount detecting means for detecting an amount of water of the moisture stored in the water storage tank, wherein the control means includes fourth limiting means for limiting the rotation frequency of the blower fan per unit time when the detected amount of water detected by the water amount detecting means is a set amount of water or larger.
14. [Claim 14] The dehumidifier according to claim 13, wherein the fourth limiting means stops the blower fan when the detected amount of water is an amount of water indicating a full water level.
15. [Claim 15] The dehumidifier according to claim 1, ntially as herein described with reference to any embodiments disclosed.