JP7279664B2 - dehumidifier - Google Patents

Description

The present disclosure relates to dehumidifiers.

For example, Patent Literature 1 discloses a protection control device for a refrigeration cycle device such as a dehumidifier. This protection control device detects the air temperature around the dehumidifier and the surface temperature of the cooler, and compares the detected air temperature and the surface temperature when determining an abnormality in the refrigeration cycle of the dehumidifier. The number of times the difference between the two compared temperatures becomes smaller than a predetermined temperature is accumulated, and when the accumulated number of times exceeds the reference number of times, the refrigerating cycle of the dehumidifier is determined to be abnormal.

JP 2008-261561 A

For example, there is a case where the refrigerant leaks so small that it takes several years for the refrigerant to completely escape, such as a slow leak. In such a case, it may be possible to dehumidify with a dehumidifier while the leak amount is small. However, in the configuration of the protection control device as disclosed in Patent Document 1, the abnormality is judged only by the temperature difference between the air temperature and the surface temperature of the cooler. Even in this state, the operation of the dehumidifier may be stopped. As a result, the product life of the dehumidifier may be shortened more than necessary.

However, in order to extend the life of the dehumidifier, if it is configured so that it can continue to operate when the refrigerant is insufficient, frost builds up to the outside of the housing, causing water leaks and causing the compressor to become hot. There is a possibility that troubles such as smoke generation may occur.

The present disclosure has been made to solve the above problems, and provides an improved dehumidifier capable of performing emergency operation according to the remaining amount of heat medium in the refrigeration cycle. intended to

The dehumidifier of the present disclosure includes a blower fan installed in the housing to take indoor air into the housing, and a compressor, a condenser, a decompression device, and an evaporator installed in the housing, which are connected by a heat medium circuit. A dehumidifier that dehumidifies the air taken into the housing by a refrigeration cycle that circulates a heat medium, a room temperature detection means that outputs an output according to the temperature of the indoor air, and a temperature of the heat medium in the evaporator. a heating medium temperature detecting means for generating an output; and a control device. When the temperature difference between the temperature of the heat medium detected by the heat medium temperature detection means during operation of the compressor and the temperature of the room air is smaller than a threshold value, the control device detects the heat in the evaporator. It is configured to perform control to lower the temperature of the medium.
The dehumidifier control device in the present disclosure reduces the rotation speed of the blower fan as control for lowering the temperature of the heat medium, and after reducing the rotation speed of the blower fan, the heat detected by the heat medium temperature detection means When the difference between the temperature of the medium and the temperature of the room air becomes larger than the threshold value, the operation of the compressor is continued while the rotation speed of the blower fan is reduced to perform dehumidification. can be anything.
Alternatively, the compressor of the dehumidifier in the present disclosure may be an inverter compressor capable of changing the drive frequency. In this case, the control device reduces the drive frequency of the inverter compressor as control for lowering the temperature of the heat medium, and after lowering the drive frequency, the temperature of the heat medium detected by the heat medium temperature detection means and the temperature of the room The dehumidification may be performed by continuing the operation of the compressor while reducing the drive frequency when the difference from the temperature of the air becomes larger than the threshold value.
Alternatively, it may have a function of executing the clothes drying operation of the dehumidifier according to the present disclosure. In this case, if the difference between the temperature of the heat medium and the temperature of the room air continues to be smaller than the threshold value during the operation of the compressor and after executing the control to lower the temperature of the heat medium, may be configured to stop the operation of the compressor and continue the rotation of the blower fan.

According to the present disclosure, when the temperature difference between the temperature of the heat medium in the evaporator while the compressor is being driven and the temperature of the room air is smaller than the threshold, the dehumidifier control device controls the temperature of the heat medium in the evaporator. Perform temperature control to reduce temperature. Here, when the temperature difference between the temperature of the heat medium in the evaporator and the room temperature is small, it is presumed that the heat medium in the evaporator is insufficient. In this way, when the shortage of the heat medium is estimated, the control device of the present disclosure executes emergency control to lower the temperature of the heat medium. As a result, even when the heat medium is insufficient, the operation of the dehumidifier can be continued while ensuring safety, and the life of the dehumidifier can be extended.

1 is a diagram showing a cross-sectional configuration of a dehumidifier according to Embodiment 1 of the present disclosure; FIG. FIG. 2 is a diagram schematically showing a circuit of a refrigeration cycle of the dehumidifier according to Embodiment 1 of the present disclosure; FIG. FIG. 4 is a diagram schematically showing the temperature of the heat medium inside the evaporator of the dehumidifier according to Embodiment 1 of the present disclosure during normal operation; FIG. 4 is a diagram schematically showing the temperature inside the evaporator when there is no heat medium inside the dehumidifying device of the dehumidifier according to Embodiment 1 of the present disclosure; FIG. 5 is a diagram schematically showing the temperature of the heat medium inside the evaporator when the heat medium inside the dehumidifying device of the dehumidifier according to Embodiment 1 of the present disclosure is insufficient. 1 schematically shows the temperature of the heat medium in the evaporator when the rotation speed of the blower fan is reduced when the heat medium in the dehumidifier of the dehumidifier of the dehumidifier according to Embodiment 1 of the present disclosure is insufficient; It is a diagram. 4 is a flowchart showing a control operation executed by the dehumidifier control device according to Embodiment 1 of the present disclosure; 1 schematically shows the temperature of the heat medium in the evaporator when the drive frequency of the compressor is reduced when the heat medium in the dehumidifying device of the dehumidifier according to Embodiment 1 of the present disclosure is insufficient; It is a diagram.

DETAILED DESCRIPTION OF THE INVENTION Embodiments for implementing the present disclosure will be described with reference to the accompanying drawings. In each figure, the same or corresponding parts are denoted by the same reference numerals, and overlapping descriptions are appropriately simplified or omitted.

Embodiment 1.
FIG. 1 is a cross-sectional view of a clothes drying dehumidifier according to Embodiment 1 of the present disclosure. The clothes drying dehumidifier is a dehumidifier having a function of executing a clothes drying operation, and will be simply described as a dehumidifier 100 hereinafter. Also, for the sake of simplification of explanation, the left side of the paper surface of FIG.

As shown in FIG. 1 , dehumidifier 100 includes housing 1 , blower 5 , dehumidifying device 30 , display operating device 7 , water storage tank 8 , and control device 10 . A discharge port 4 is formed in the upper portion of the housing 1 . A suction port 9 is formed in the upper portion of the rear surface of the housing 1 .

The blower 5 is installed in the central portion of the housing 1 . The blower 5 includes, for example, a blower fan and a motor. The rotating shaft of the blower is installed in a direction parallel to the front-rear direction of the dehumidifier 100 in the central portion of the housing 1, that is, in a horizontal direction.

The dehumidifier 30 is provided behind the blower 5 inside the housing 1 . The dehumidifier 30 includes an evaporator 31 , a compressor 32 , a condenser 33 and a decompressor 34 . The decompression device 34 is, for example, an expansion valve or a capillary tube. Details of the dehumidifier 30 will be described later.

A water storage tank 8 is installed in the lower front portion of the housing 1 . The water storage tank 8 can be removed from the dehumidifier 100 .

A display operation device 7 is provided in the upper portion of the front surface of the housing 1 . The display operation device 7 includes an operation section and a display section. The operation unit is configured to receive an operation by a user. The display unit is configured to display information regarding the operating state of the dehumidifier 100 and information such as the occurrence of an abnormality, thereby informing the user of each type of information.

A temperature/humidity detection sensor 12 is installed at a lower position on one side surface of the housing 1 . The temperature/humidity detection sensor 12 functions as room temperature detection means that outputs an output according to the temperature of the indoor air in which the dehumidifier 100 is installed. A pipe temperature detection sensor 13 (see FIG. 2) for detecting the temperature of the heat medium is installed on the surface of the steel pipe near the exit of the evaporator 31 . The tube temperature detection sensor 13 functions as heat medium temperature detection means that outputs an output corresponding to the temperature of the heat medium in the evaporator 31 . A thermistor, for example, is used as the pipe temperature detection sensor 13 . In addition, the installation position of the pipe temperature detection sensor 13 is not limited to this position, and other sensors may be used as long as the temperature near the outlet of the evaporator 31 of the heat medium circuit in the circuit in which the heat medium circulates can be detected or estimated. may be installed at the position of

The dehumidifier 100 also includes a control device 10 . The control device 10 is installed in the front part inside the housing 1 . The control device 10 has at least one microcomputer, a memory and a power supply circuit.

The control device 10 is connected to various sensors of the dehumidifier 100, including the temperature/humidity detection sensor 12 and the tube temperature detection sensor 13, and the display operation device 7 so as to be able to communicate by wire or wirelessly. Further, the control device 10 is electrically connected to the actuators of the members of the dehumidifier 100 . For example, the actuator may be the blower 5 or the compressor 32 . The control device 10 acquires the operation content from the display operation device 7 and information such as humidity and temperature detected by various sensors, and operates the blower 5 of the dehumidifier 100, the dehumidifier 30, etc. based on the acquired information. Control.

More specifically, when controlling the operation of the blower 5 , the control device 10 outputs a control signal to the motor of the blower 5 to control the rotation speed of the blower fan. The motor of the blower 5 rotates at the number of revolutions corresponding to the control signal, and as a result, the indoor air A is sucked horizontally into the housing 1 through the suction port 9 . Air A taken into the housing 1 passes through the evaporator 31 . The air B that has passed through the evaporator 31 is discharged upward from the discharge port 4 into the room.

The control device 10 also controls the operation of the dehumidifier 30 . The configuration, operation, and control of the dehumidifier 30 of the dehumidifier 100 according to the present embodiment will be specifically described below.

FIG. 2 is a diagram schematically showing the heat medium circuit of the dehumidifier 30. As shown in FIG. A heat medium circuit of the dehumidifier 30 is a circuit in which an evaporator 31 , a compressor 32 , a condenser 33 , and a decompression device 34 are connected in a loop by pipes 35 . The dehumidifier 30 circulates the heat medium in this heat medium circuit to operate the refrigeration cycle. The dehumidifier 30 removes moisture from the air taken into the housing 1 by refrigerating cycle operation.

More specifically, in the heat medium circuit, the outlet of the evaporator 31 is connected to the inlet of the compressor 32, the outlet of the compressor 32 is connected to the inlet of the condenser 33, the outlet of the condenser 33 is connected to the inlet of the decompression device 34, and the pressure is reduced. The outlets of the device 34 are connected to the inlets of the evaporators 31 by pipes 35 respectively.

When the heat medium flowing through the heat medium circuit flows out of the evaporator 31, it flows into the compressor 32 and is compressed. The compressed heat medium becomes a high-temperature, high-pressure gas, flows out from the compressor 32 , and flows into the condenser 33 . The heat medium radiates heat in the condenser 33 , becomes a high-pressure liquid, flows out of the condenser 33 , and flows into the decompression device 34 . The heat medium is decompressed by the decompression device 34 and expanded into a low-temperature, low-pressure gas-liquid two-phase state. The heat medium absorbs heat in the evaporator 31 , becomes a low-pressure gas, and flows out of the evaporator 31 .

Air A sucked from the suction port 9 by the blower fan of the blower 5 passes through the evaporator 31 and the condenser 33 . The evaporator 31 removes moisture contained in the passing air A by absorbing heat into the heat medium whose pressure has been reduced by the decompression device 34 . The air passing through the evaporator 31 is dehumidified. The blower 5 discharges the dehumidified air B indoors. Moisture removed from the air by the evaporator 31 is stored in the water storage tank 8 .

When controlling the operation of the dehumidifier 30, the compressor 32 is driven by controlling the drive frequency of the compressor 32. FIG. By driving the compressor 32, the above refrigerating cycle is driven and the air A is dehumidified.

Further, the control device 10 according to the present embodiment detects an abnormality due to leakage of the heat medium from the temperature of the heat medium and the temperature of the air taken into the housing 1, and predicts the leak state of the heat medium. emergency operation is performed accordingly.

Concretely, the control for predicting the leak of the heat medium and the state of the leak will be described. Leakage and leak state prediction can be performed using the temperature of the heat medium and the temperature of the air A taken into the housing 1 . Here, the temperature of the indoor air detected by the temperature/humidity detection sensor 12 (hereinafter referred to as “room temperature”) is the temperature of the air A taken into the housing 1 . Also, the temperature detected by the pipe temperature detection sensor 13 is the internal temperature of the heat medium circuit near the outlet of the evaporator 31 . Therefore, in the control of the present embodiment, the temperature detection value by the temperature/humidity detection sensor 12 is used as the room temperature Tr, and the detection value by the pipe temperature detection sensor 13 is used as the temperature Te of the heat medium in the evaporator 31. and However, other temperature sensors installed at other positions may be used as long as they can detect or estimate the temperature of the room air and the temperature Te of the heat medium on the outlet side in the evaporator 31 .

3 to 5 are diagrams schematically showing the relationship between the temperature of the heat medium in the evaporator 31 and the room temperature. 4 shows a state in which the heat medium leaks and becomes zero, and FIG. 5 shows a state in which the heat medium leaks and is insufficient.

As shown in FIG. 3, when the dehumidifier 30 is functioning normally, the temperature Te of the heat medium that adiabatically expands in the decompression device 34 and flows into the evaporator 31 is set in advance from the room temperature Tr. The temperature becomes lower than the temperature difference.

In the absence of the heat medium, there is no heat transfer within the heat medium circuit of the dehumidifier 30, as shown in FIG. Therefore, the temperature Te of the heat medium in the evaporator 31 becomes the same temperature as the room temperature Tr.

When the heat medium is insufficient, the amount of pressure reduction of the heat medium that has passed through the decompression device 32 is large. lower. Also, the amount of heat absorbed by the heat medium in the evaporator 31 increases. Therefore, the temperature of the heat medium rises as the two-layer refrigerant gasifies within the evaporator 31 . As a result, as shown in FIG. 5, the difference between the temperature Te of the evaporator 31 near the outlet and the room temperature Tr is small.

From the above, when the difference between the temperature Te of the heat medium near the outlet of the evaporator 31 and the room temperature Tr is small, it is predicted that the heat medium is leaking.

However, in the present embodiment, even when a small difference between the heat medium temperature Te and the room temperature Tr is detected, the control device 10 does not immediately stop the operation of the dehumidifier 30 as an abnormality due to leakage. First, control is executed to lower the temperature of the heat medium. As control for lowering the temperature, control for lowering the rotational speed of the blower fan of the blower 5 is executed. FIG. 6 is a diagram showing the temperature Te of the heat medium and the room temperature Tr in a state where the heat medium is insufficient. It shows the temperature Te of the heat medium and the room temperature Tr when the number is decreased.

By lowering the rotational speed of the blower fan, the amount of air A taken in is reduced. Therefore, the amount of heat absorbed by the heat medium in the evaporator 31 is reduced. Therefore, when the rotation speed of the blower fan is reduced in a state in which the heat medium is insufficient, as shown in FIG. It decreases compared to the temperature Te_a, and the difference from the room temperature Tr increases. In this case, the state in which the temperature difference between the temperature Te of the heat medium and the room temperature Tr is small is eliminated.

When the temperature difference between the temperature Te of the heat medium and the room temperature Tr increases due to a decrease in the rotation speed of the blower fan, the control device 10 reduces the rotation speed of the blower fan and causes the dehumidifier 30 to Perform dehumidifying operation. The amount of air A taken into the dehumidifier 100 can be reduced by lowering the rotational speed of the blower fan. Therefore, a rapid temperature drop of the heat medium near the entrance of the evaporator 31 can be prevented. As a result, even if the operation of the dehumidifier 30 is continued, it is possible to prevent water leakage caused by rapid growth of frost in the dehumidifier 30, and to prevent the compressor 32 from becoming abnormally hot. can do.

On the other hand, when there is no heat medium (or when there is almost no heat medium), even if the rotational speed of the blower fan is reduced, heat does not move in the heat medium circuit. The difference remains small. That is, the state in which the temperature difference between the temperature Te of the heat medium and the room temperature Tr is small is not eliminated. In this case, since it is judged that the amount of leakage of the heat medium is large, it is judged to be abnormal, and the operation of the dehumidifier 30 is stopped.

As described above, in the present embodiment, the temperature difference between the temperature Te of the heat medium and the room temperature Tr is used as the abnormality determination value, and the reference value T1 is used as the threshold value for leak determination. The reference value T1 is set in advance and stored in the control device 10 . The specific value is based on the range of the temperature difference between the room temperature and the temperature of the heat medium that occurs when a leak occurs and the heat medium is insufficient. can be set as appropriate.

FIG. 7 is a flowchart showing an example of a specific control operation executed by the control device 10 to detect an abnormal state due to heat medium leakage. The process of FIG. 7 is repeatedly executed at regular control intervals t1 when the compressor 32 is started. The control interval t1 here is 5 minutes as an example.

In FIG. 7, first, in step S1, the temperature Te of the heat medium and the room temperature Tr are detected. That is, the temperature detection values by the tube temperature detection sensor 13 and the temperature/humidity detection sensor 12 are respectively acquired.

Next, in step S2, it is determined whether or not the abnormality determination value (Tr-Te), which is the difference between the room temperature Tr and the temperature Te of the heat medium, is smaller than the reference value T1. If the determination result of step S2 is "No", that is, if it is determined that the abnormality determination value (Tr-Te) is equal to or greater than the reference value T1, it is considered that there is no leakage of the heat medium. In this case, the process proceeds to step S10, and it is determined that the dehumidifier 30 is normal. After that, the process returns to step S1.

On the other hand, if the determination result in step S2 is "Yes", that is, if it is determined that the abnormality determination value (Tr-Te) is smaller than the reference value T1, then in step S3, 1 is added to the abnormality determination count N1. is added and incremented. The abnormality determination count N1 is a counter that counts the number of times the abnormality determination value (Tr-Te) is smaller than the reference value T1. The abnormality determination count N1 is set to an initial value of zero when the compressor 32 is started.

Next, in step S4, it is determined whether or not the abnormality determination count N1 is greater than or equal to the reference count N2. Here, the reference number of times N2 is a determination threshold set for determining abnormality, and is stored in the control device 10 in advance. Note that the reference number of times N2 is, for example, several times, and six times as a more specific example.

If the determination result in step S4 is "Yes", that is, if it is determined that the abnormality determination count N1 is equal to or greater than the reference count, the process proceeds to step S20, and it is determined that the dehumidifier 30 has an abnormality. After that, in step S21, the operation of the compressor 32 is stopped. Next, in step S22, for example, the display section of the display operation device 7 displays a message indicating that the dehumidifier 30 has an abnormality in response to the fact that the operation of the compressor 32 has been stopped. Thereby, the user is informed of the abnormality of the dehumidifier 30 . After that, the process proceeds to step S23, and the control operation of the dehumidifier 30 ends.

On the other hand, if the determination result of step S4 is "No", that is, if it is determined that the abnormality determination count N1 is smaller than the reference count N2, the process proceeds to step S30. In step S30, the rotation speed of the blower fan is lowered. After that, the process returns to step S1.

Here, when the amount of leakage of the heat medium is small, the temperature Te of the heat medium drops due to the decrease in the rotational speed of the blower fan in step S30. Therefore, the difference between the temperature Te of the heat medium and the room temperature Tr increases, and when the process of FIG. has been canceled. As a result, the process proceeds to step S10, it is determined to be normal, and the operation of the compressor 32 is continued.

On the other hand, when the heat medium leak amount is large, even if the rotation speed of the blower fan is reduced in step S30, the temperature Te of the heat medium does not decrease sufficiently, and the difference between the temperature Te of the heat medium and the room temperature Tr is small. status remains. Therefore, in the process of FIG. 7, the abnormality determination value (Tr-Te) continues to be smaller than the reference value T1 from the next time onwards. Therefore, finally, the abnormality determination frequency N1 reaches the reference frequency N2, the abnormality detection frequency N1 exceeds the reference frequency N2, and the operation of the compressor 32 is stopped.

As described above, according to the present embodiment, even when the heat medium is leaking, it is determined that the operation of the dehumidifier 30 can still be continued, or that there is an abnormality, depending on the remaining amount of the heat medium. and the state in which the operation should be stopped, and the control corresponding to each state is executed. As a result, it is possible to avoid a situation in which the dehumidifier 30 is immediately determined to be abnormal due to a slight amount of heat medium leakage, and the dehumidifier 100 cannot operate. Further, in this case, the operation of the dehumidifier 30 is continued with the rotational speed of the blower fan reduced. Therefore, it is possible to suppress the occurrence of water leakage and the abnormal temperature rise of the compressor 32 due to the rapid growth of frost in the dehumidifier 30 . Further, by detecting that the temperature of the heat medium does not decrease even when the rotational speed of the blower fan decreases, it is possible to reliably detect that there is a large amount of leakage of the heat medium. In this case, the safety of the dehumidifier can be enhanced by stopping the dehumidifier 30 .

For example, if the dehumidifier 100 has a function to select the clothes drying operation mode, and if it is determined that there is an abnormality by the above control, the operation of the compressor 32 is stopped and only the operation of the blower 5 is performed. It may be controlled to continue. As a result, it is possible to continue drying the clothes in a safe state.

Further, in the above control, the case where the temperature of the heat medium is lowered by decreasing the rotational speed of the blower fan when the heat medium is insufficient has been described. As a result, even when the heat medium is insufficient, it is possible to maintain a state in which dehumidification is possible with the remaining heat medium. However, the method for continuing the operation of the dehumidifier 30 when the heat medium is insufficient is not limited to this, and any method may be used as long as the temperature of the heat medium in the evaporator 31 can be lowered. Therefore, for example, the motor that drives the compressor 32 may be an inverter compressor that is powered by an inverter, and the drive frequency of the inverter compressor may be controlled to lower the temperature of the heat medium.

FIG. 8 is a diagram showing temperature changes of the heat medium inside the evaporator 31 when the driving frequency of the compressor 32 is lowered in a state in which the heat medium of the dehumidifier is insufficient. In FIG. 8, the solid line b represents the temperature of the heat medium when the drive frequency of the compressor 32 is lowered, and for comparison, the solid line a represents the temperature of the heat medium when the drive frequency of the compressor 32 is maintained. is shown.

As shown in FIG. 8, by lowering the operating frequency of the compressor 32, the amount of heat medium circulating in the heat medium circuit can be reduced. As a result, the temperature of the heat medium rises on the outlet side of the decompression device 34, so that the two-phase refrigerant passes through the evaporator 31 without being gasified. As a result, even on the outlet side of the evaporator 31, the abnormality determination value (Tr-Te), which is the temperature difference between the temperature Te of the heat medium and the room temperature Tr, increases. As a result, the state in which the abnormality determination value (Te-Tr) is smaller than the reference value T1 is resolved, and the operation of the dehumidifier 30 is continued. In addition, in a state in which a slight amount of leakage of the heat medium is expected, the operation of the dehumidifier 30 is continued while the operating frequency of the compressor 32 is lowered. Also, an excessive temperature rise of the compressor 32 is suppressed.

In the present embodiment, the case where it is determined that there is an abnormality on the condition that the number of times N1 of abnormality determination is greater than or equal to the reference number of times N2 has been described. However, in the present disclosure, the abnormality determination condition is not limited to this. For example, it may be determined that the dehumidifier 30 is abnormal when the duration of the state in which the abnormality determination value (Tr-Te) is smaller than the reference value T1 is longer than or equal to the reference time.

1 housing, 4 outlet, 5 air blower, 7 display operation device, 8 water storage tank, 9 suction port, 10 control device, 12 temperature and humidity detection sensor, 13 pipe temperature detection sensor, 30 dehumidifier, 31 evaporator, 32 Compressor 33 Condenser 34 Pressure reducing device 35 Piping 100 Dehumidifier

Claims (5)

A blower fan installed in a housing for drawing indoor air into the housing;
Dehumidification that dehumidifies the air taken into the housing by a refrigeration cycle installed in the housing and connecting a compressor, a condenser, a decompression device, and an evaporator with a heat medium circuit to circulate the heat medium. a device;
room temperature detection means for generating an output corresponding to the temperature of the indoor air;
heat medium temperature detection means for generating an output corresponding to the temperature of the heat medium in the evaporator;
When the difference between the temperature of the heat medium detected by the heat medium temperature detecting means during operation of the compressor and the temperature of the room air is smaller than a threshold value, the temperature of the heat medium in the evaporator is a control device configured to perform control to lower the temperature;
with
The control device reduces the rotation speed of the blower fan as control for lowering the temperature of the heat medium ,
When the difference between the temperature of the heat medium detected by the heat medium temperature detecting means and the temperature of the indoor air becomes larger than the threshold after the rotational speed of the blower fan is decreased, the blower A dehumidifier characterized in that the dehumidification is performed by continuing the operation of the compressor while the rotation speed of the fan is reduced. A blower fan installed in a housing for drawing indoor air into the housing;
Dehumidification that dehumidifies the air taken into the housing by a refrigeration cycle installed in the housing and connecting a compressor, a condenser, a decompression device, and an evaporator with a heat medium circuit to circulate the heat medium. a device;
room temperature detection means for generating an output corresponding to the temperature of the indoor air;
heat medium temperature detection means for generating an output corresponding to the temperature of the heat medium in the evaporator;
When the difference between the temperature of the heat medium detected by the heat medium temperature detecting means during operation of the compressor and the temperature of the room air is smaller than a threshold value, the temperature of the heat medium in the evaporator is a control device configured to perform control to lower the temperature;
The compressor is an inverter compressor capable of changing the driving frequency,
The control device lowers the drive frequency of the inverter compressor as control for lowering the temperature of the heat medium ,
After lowering the drive frequency, if the difference between the temperature of the heat medium detected by the heat medium temperature detecting means and the temperature of the indoor air becomes larger than the threshold, the drive frequency is lowered. Dehumidification is performed by continuing to operate the compressor in a state where the
A dehumidifier characterized by being configured as follows. During operation of the compressor and after executing control to lower the temperature of the heat medium, the control device
3. The apparatus according to claim 1, wherein the compressor is configured to stop when the difference between the temperature of the heat medium and the temperature of the indoor air continues to be smaller than the threshold value. Dehumidifier as described. The dehumidifier has a function of executing a clothes drying operation,
During operation of the compressor and after executing control to lower the temperature of the heat medium, the control device
When the difference between the temperature of the heat medium and the temperature of the indoor air continues to be smaller than the threshold value, the operation of the compressor is stopped and the rotation of the blower fan is continued. there is
The dehumidifier according to claim 1 or 2, characterized by: A blower fan installed in a housing for drawing indoor air into the housing;
Dehumidification that dehumidifies the air taken into the housing by a refrigeration cycle installed in the housing and connecting a compressor, a condenser, a decompression device, and an evaporator with a heat medium circuit to circulate the heat medium. a device;
room temperature detection means for generating an output corresponding to the temperature of the indoor air;
heat medium temperature detection means for generating an output corresponding to the temperature of the heat medium in the evaporator;
When the difference between the temperature of the heat medium detected by the heat medium temperature detecting means during operation of the compressor and the temperature of the room air is smaller than a threshold value, the temperature of the heat medium in the evaporator is a control device configured to perform control to lower the temperature;
A dehumidifier comprising
The dehumidifier has a function of executing a clothes drying operation,
During operation of the compressor and after executing control to lower the temperature of the heat medium, the control device
When the difference between the temperature of the heat medium and the temperature of the indoor air continues to be smaller than the threshold value, the operation of the compressor is stopped and the rotation of the blower fan is continued. there is
A dehumidifier characterized by:

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