JP6338765B2 - Dehumidifier - Google Patents

Description

  The present invention relates to a dehumidifying device, and more particularly, to a dehumidifying device including a moisture adsorbing means and a refrigerant circuit.

Patent Document 1 discloses a dehumidifying device including a refrigerant circuit in which a refrigerant circulates and a desiccant material that adsorbs and desorbs moisture in the air. The refrigerant circuit of the dehumidifying device is configured by connecting a compressor, a flow path switching device, a first heat exchanger, a decompression device, and a second heat exchanger with piping.
In the dehumidifying device, the first heat exchanger operates as a condenser and the second heat exchanger operates as an evaporator, and a first operation mode in which moisture held in the desiccant material is desorbed, and first heat The exchanger operates as an evaporator and the second heat exchanger operates as a condenser to perform an operation for alternately switching between a second operation mode in which moisture is adsorbed from air by a desiccant material.

Japanese Patent No. 5454565

In the dehumidifying apparatus described in Patent Document 1, when the frost adhesion (frost formation) to the first heat exchanger is detected during the second operation mode, the second operation mode is terminated and the first operation mode is switched. Perform the action. Thereby, obstruction | occlusion of the air wind path by the increase in the frost adhering to the 1st heat exchanger is reduced, and the fall of the ventilation volume is suppressed.
However, when the temperature of the air in the dehumidification target space is low and the humidity is high, the time from the start of the second operation mode in which the first heat exchanger operates as an evaporator until frost adheres to the first heat exchanger (arrival) (Frost time) is short, and switching between the first operation mode and the second operation mode is frequently performed. That is, a flow path switch (for example, a four-way valve) that switches the refrigerant flow path frequently operates.
For this reason, the frequency | count of switching operation | movement of a flow-path switching device increases, and there existed a subject that a product lifetime will fall. Moreover, before the moisture in the air was sufficiently adsorbed by the desiccant material, there was a problem that the dehumidifying efficiency was lowered because the second operation mode was ended.

  The present invention has been made against the background of the above problems, and an object of the present invention is to provide a dehumidifying device capable of suppressing the number of operations of the flow path switching device.

A dehumidifying device according to the present invention is a refrigerant in which a refrigerant is circulated by connecting a compressor, a flow path switching unit that switches a refrigerant flow path, a first heat exchanger, a pressure reducing device, and a second heat exchanger in a pipe. A moisture adsorbing member disposed between the circuit and the first heat exchanger and the second heat exchanger, for adsorbing moisture contained in the air flowing in the air passage and desorbing the adsorbed moisture; and dehumidification a blower for flowing the air in the target space to the air path, said first heat exchanger, a blower for flowing the air in the order of the water adsorption member and the second heat exchanger, before Symbol compressor, wherein And a control means for controlling the air blower, wherein the control means controls the flow path switch and the compressor so that the first heat exchanger functions as an evaporator. Together with the second heat exchanger to function as a condenser. A first adsorption operation mode in which the refrigerant is circulated in a refrigerant circuit, the air blower is operated to flow air in the dehumidification target space into the air passage, and moisture is adsorbed by the moisture adsorption member; and the compressor A second adsorption operation mode in which the circulation of the refrigerant is stopped, the blower is operated, the air in the dehumidification target space is caused to flow into the air path, and the moisture adsorption member adsorbs moisture. And controlling the flow path switch and the compressor so that the first heat exchanger functions as a condenser and the second heat exchanger functions as an evaporator. Executes one of the operation modes of the desorption operation mode in which the refrigerant is circulated, the air blower is operated to flow the air in the dehumidifying target space into the air path, and the moisture adsorbing member desorbs the moisture. To do Constructed, one with either of the first adsorption operation mode or the second adsorption operation mode, in which switching between said desorbing operation mode alternately.

  The dehumidifying apparatus according to the present invention alternately switches between the first adsorption operation mode or the second adsorption operation mode and the desorption operation mode. For this reason, the frequency | count of operation | movement of a flow path switch can be suppressed. Therefore, shortening of the product life can be suppressed.

It is a schematic block diagram of the dehumidification apparatus in Embodiment 1 of this invention. It is the adsorption isotherm which showed transition of the equilibrium adsorption amount with respect to the relative humidity of the moisture adsorption member in Embodiment 1 of this invention. It is the block diagram which showed the element controlled by the control means with which the dehumidification apparatus in Embodiment 1 of this invention is equipped, and a control means. It is a figure which shows the refrigerant | coolant circulation path | route in the 1st adsorption | suction operation mode of the dehumidification apparatus in Embodiment 1 of this invention. It is a humid air line figure which shows temperature / humidity transition in the 1st adsorption | suction operation mode of the dehumidification apparatus in Embodiment 1 of this invention. It is a humid air line figure which shows temperature / humidity transition in the 2nd adsorption | suction operation mode of the dehumidification apparatus in Embodiment 1 of this invention. It is a figure which shows the refrigerant | coolant circulation path | route in the desorption operation mode of the dehumidification apparatus in Embodiment 1 of this invention. It is a humid air line figure which shows temperature / humidity transition in the desorption operation mode of the dehumidification apparatus in Embodiment 1 of this invention. It is a flowchart which shows the operation mode switching process in Embodiment 1 of this invention. It is a schematic block diagram of the dehumidification apparatus in Embodiment 2 of this invention.

  Hereinafter, embodiments of a dehumidifying device according to the present invention will be described in detail with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is a schematic configuration diagram of a dehumidifying apparatus 100 according to Embodiment 1 of the present invention. As shown in FIG. 1, the dehumidifying device 100 includes a compressor 11, a first heat exchanger 12 a, a second heat exchanger 12 b, and a third heat exchange that are housed in a housing (not shown). The refrigerant circuit 10, the moisture adsorbing member 20, and the blower 30 are connected to each other by a refrigerant pipe. In addition, an air passage 1 is formed in the housing of the dehumidifying device 100 to connect the suction port 1a that takes in air from the dehumidification target space (dehumidification target air) and the air outlet 1b that discharges air to the dehumidification target space. A first heat exchanger 12a, a moisture adsorbing member 20, a second heat exchanger 12b, a third heat exchanger 12c, and a blower 30 are arranged in the air path 1 in order from the suction port 1a.

  The compressor 11 is a positive displacement compressor that is driven by a motor (not shown) and compresses the refrigerant in the refrigerant circuit 10. As the refrigerant in the present embodiment, for example, HFC refrigerants such as R410A, R407C, and R404A, HCFC refrigerants such as R22 and R134a, or natural refrigerants such as hydrocarbon and helium are used. Further, the number of compressors 11 is not limited to one, and two or more compressors may be connected in parallel or in series.

  The first heat exchanger 12a, the second heat exchanger 12b, and the third heat exchanger 12c are cross-fin type fin-and-tube heat exchangers configured by heat transfer tubes and a plurality of fins. is there. The first heat exchanger 12 a and the second heat exchanger 12 b function as a condenser (heat radiator) or an evaporator according to the refrigerant circulation path switched by the flow path switch 14. The third heat exchanger 12c functions as a condenser (heat radiator). In this Embodiment, the 1st heat exchanger 12a and the 2nd heat exchanger 12b can be made into the heat exchanger of the same structure by providing the 3rd heat exchanger 12c which functions as a condenser. . Thereby, it becomes possible to share components.

  The decompression device 13 decompresses the refrigerant flowing in the refrigerant circuit 10 and adjusts the flow rate. As the decompression device 13, an electronic expansion valve capable of adjusting the opening degree of the throttle by a stepping motor (not shown), a mechanical expansion valve employing a diaphragm for the pressure receiving portion, or a capillary tube is used.

  The flow path switch 14 is a four-way valve that switches the direction of the refrigerant flowing through the first heat exchanger 12a and the second heat exchanger 12b. The flow path switch 14 is a flow path in which the refrigerant flows in the order of the third heat exchanger 12c, the second heat exchanger 12b, the decompression device 13, and the first heat exchanger 12a in the first adsorption operation mode. Form. In a first adsorption operation mode described later, the third heat exchanger 12c and the second heat exchanger 12b function as a condenser (heat radiator), and the first heat exchanger 12a functions as an evaporator. Further, the flow path switch 14 is a flow path in which the refrigerant flows in the order of the third heat exchanger 12c, the first heat exchanger 12a, the decompression device 13, and the second heat exchanger 12b in the desorption operation mode. Form. In the desorption operation mode, the third heat exchanger 12c and the first heat exchanger 12a function as a condenser (heat radiator), and the second heat exchanger 12b functions as an evaporator. The switching of the flow path by the flow path switch 14 is controlled by the control means 4 (FIG. 3).

  The moisture adsorbing member 20 is a desiccant block installed between the first heat exchanger 12a and the second heat exchanger 12b. The moisture adsorbing member 20 is a porous flat plate having a shape (polygonal or circular, etc.) along the cross section of the air passage 1 so that the cross sectional area of the air passage 1 of the dehumidifying device 100 can be increased. Composed. Then, air passes in the thickness direction of the moisture adsorbing member 20. The surface of the porous flat plate is coated, surface-treated or impregnated with an adsorbent having a characteristic of absorbing moisture from relatively high humidity air and releasing it to relatively low humidity air. As the adsorbent, zeolite, silica gel, activated carbon, polymer adsorbent, or the like is used.

  FIG. 2 is an adsorption isotherm showing the transition of the equilibrium adsorption amount with respect to the relative humidity of the moisture adsorption member 20 of the present embodiment. In general, the equilibrium adsorption amount increases as the relative humidity increases. In the present embodiment, an adsorbent having a large difference between the equilibrium adsorption amount with a relative humidity of 80% or more and the equilibrium adsorption amount with a relative humidity of 40 to 60% (for example, 50%) is used. Thereby, the adsorption | suction and desorption capability of the moisture adsorption member 20 can be improved.

  The blower 30 is a fan capable of changing the flow rate of air passing through the air passage 1 of the dehumidifying device 100. As the blower 30, a centrifugal fan or a multiblade fan driven by a motor such as a DC fan motor is used. In addition, the air blower 30 is not limited to the case where it is arrange | positioned in the most downstream of the air path 1, but the target air volume is made into the 1st heat exchanger 12a, the water | moisture-content adsorption member 20, the 2nd heat exchanger 12b, and What is necessary is just to ventilate in order of the 3rd heat exchanger 12c.

  The dehumidifier 100 further includes a temperature / humidity sensor 2a that detects the temperature and humidity (relative humidity) of the air to be dehumidified taken in from the suction port 1a, and the temperature and temperature (relative humidity) of the air after passing through the moisture adsorbing member 20. ) And a wind speed sensor 3 for detecting the speed of the air passing through the air path 1 (wind speed). Note that the wind speed sensor 3 is not limited to the arrangement shown in FIG. 1 (the most downstream of the air path 1), and can be arranged at any position where the wind speed passing through the air path 1 can be detected. .

  The temperature / humidity sensor 2a corresponds to a “temperature sensor” and a “humidity sensor” in the present invention. The second temperature / humidity sensor 2b corresponds to the “second temperature sensor” and the “second humidity sensor” in the present invention.

  Further, the dehumidifying apparatus 100 includes a control unit 4, a time measuring unit 5, and a storage unit 6. FIG. 3 is a block diagram showing the control means 4 provided in the dehumidifying apparatus 100 according to the present embodiment and the elements controlled by the control means 4. The control means 4 is composed of a microcomputer or the like and controls the entire dehumidifying device 100. Based on outputs from the temperature / humidity sensor 2a, the wind speed sensor 3 and the time measuring means 5, the control means 4 controls the rotational speed of the blower 30, the rotational speed control of the compressor 11, the opening degree control of the decompression device 13, and the flow path switching. Various controls such as switching control of the device 14 are performed. The time measuring means 5 measures the operating time of the dehumidifying device 100 under the control of the control means 4. The storage unit 6 is a memory that stores a program and various data necessary for the operation of the dehumidifier 100.

  Next, the operation mode of the dehumidifier 100 will be described. The dehumidifier 100 operates in the first adsorption operation mode and the desorption operation mode by controlling the flow path switch 14 by the control means 4 and switching the refrigerant circulation path of the refrigerant circuit 10. Further, in the dehumidifying apparatus 100, the compressor 11 is controlled by the control means 4, and the refrigerant circulation operation of the refrigerant circuit 10 is switched between operation and stop, so that either the first adsorption operation mode or the second adsorption operation mode is selected. On the other hand, it works.

  In any operation mode, the blower 30 is driven and controlled by the control means 4. Thereby, the air from the dehumidification target space is taken into the air passage 1 from the suction port 1a, and the first heat exchanger 12a, the moisture adsorbing member 20, the second heat exchanger 12b, and the third heat exchanger. It passes in the order of 12c and is discharged from the blower outlet 1b. In the first adsorption operation mode or the second adsorption operation mode, the moisture adsorbing member 20 performs an adsorption operation on high-humidity air (eg, relative humidity of 70% or more) with a small moisture retention amount, and in the desorption operation mode. The desorption operation is performed on air having a large amount of moisture retention and low humidity (for example, relative humidity of 60% or less).

  FIG. 4 shows the refrigerant circulation path in the first adsorption operation mode, and FIG. 5 is a moist air diagram showing the temperature and humidity transition in the first adsorption operation mode. FIG. 6 is a moist air diagram showing the temperature and humidity transition in the second adsorption operation mode. FIG. 7 shows the refrigerant circulation path in the desorption operation mode, and FIG. 8 is a humid air diagram showing the temperature and humidity transition in the desorption operation mode.

(First adsorption operation mode: operation of refrigerant circuit 10)
First, the refrigerant operation of the refrigerant circuit 10 in the first adsorption operation mode will be described with reference to FIG. In the first adsorption operation mode, the refrigerant flows along the solid line shown in FIG. Specifically, the refrigerant compressed and discharged by the compressor 11 flows into the third heat exchanger 12c. The third heat exchanger 12c functions as a condenser, and the refrigerant exchanges heat with air to partially condense. The refrigerant that has passed through the third heat exchanger 12c flows through the flow path switch 14 into the second heat exchanger 12b. The second heat exchanger 12b functions as a condenser, and the refrigerant exchanges heat with air to be condensed and liquefied. The refrigerant that has passed through the second heat exchanger 12b flows into the decompression device 13, is decompressed by the decompression device 13, and then flows into the first heat exchanger 12a. The first heat exchanger 12a functions as an evaporator, and the refrigerant evaporates by exchanging heat with air. The refrigerant that has passed through the first heat exchanger 12a passes through the flow path switch 14 and is sucked into the compressor 11 again.

(First adsorption operation mode: air operation)
Next, the operation of air in the air passage 1 of the dehumidifier 100 in the first adsorption operation mode will be described with reference to FIG. In the first adsorption operation mode, first, the dehumidification target air introduced from the suction port 1a of the dehumidifier 100 (points 1-1 in FIG. 5) flows into the first heat exchanger 12a. Here, the air to be dehumidified is cooled to a dew point temperature or lower by the first heat exchanger 12a functioning as an evaporator, and becomes dehumidified air from which moisture has been dehumidified (points 1-2 in FIG. 5). The air cooled and dehumidified by the first heat exchanger 12 a flows into the moisture adsorption member 20. Here, since the relative humidity of the cooled and dehumidified air is as high as about 80 to 90 (% RH), the adsorbent of the moisture adsorbing member 20 easily adsorbs moisture. Moisture is adsorbed (dehumidified) by the adsorbent of the moisture adsorbing member 20, and the air whose humidity has been reduced (points 1-3 in FIG. 5) flows into the second heat exchanger 12b. Since the second heat exchanger 12b functions as a condenser, the passing air is heated and the temperature rises (FIGS. 5 and 1-4). The air that has passed through the second heat exchanger 12b flows into the third heat exchanger 12c. Since the 3rd heat exchanger 12c is functioning as a condenser, the air which passes is heated and temperature rises (FIG. 5, 1-5 point). The air that has passed through the third heat exchanger 12c is discharged from the air outlet 1b.

(Second adsorption operation mode: operation of refrigerant circuit 10)
In the second adsorption operation mode, the control unit 4 stops the operation of the compressor 11 and stops the circulation of the refrigerant in the refrigerant circuit 10.

(Second adsorption operation mode: air operation)
Next, the operation of air in the air passage 1 of the dehumidifier 100 in the second adsorption operation mode will be described with reference to FIG. In the second adsorption operation mode, the air to be dehumidified introduced from the suction port 1a of the dehumidifier 100 passes through the first heat exchanger 12a without exchanging heat in the first heat exchanger 12a. Moisture is adsorbed (dehumidified) by the adsorbent of the moisture adsorbing member 20 in the dehumidification target air (points in FIGS. 6, 1-2a) that has passed through the first heat exchanger 12a (points in FIGS. 6, 1-3a). The air whose humidity has been reduced by the adsorbent of the moisture adsorbing member 20 passes through the second heat exchanger 12b without being subjected to heat exchange in the second heat exchanger 12b, and is discharged from the outlet 1b.

(Desorption operation mode: operation of the refrigerant circuit 10)
Next, the refrigerant operation of the refrigerant circuit 10 in the desorption operation mode will be described with reference to FIG. In the desorption operation mode, the refrigerant flows along the solid line shown in FIG. Specifically, the refrigerant compressed and discharged by the compressor 11 flows into the third heat exchanger 12c. The third heat exchanger 12c functions as a condenser, and the refrigerant exchanges heat with air to partially condense. The refrigerant that has passed through the third heat exchanger 12c flows through the flow path switch 14 into the first heat exchanger 12a. The first heat exchanger 12a functions as a condenser, and the refrigerant exchanges heat with air to be condensed and liquefied. The refrigerant that has passed through the first heat exchanger 12a flows into the decompression device 13, is decompressed by the decompression device 13, and then flows into the second heat exchanger 12b. The second heat exchanger 12b functions as an evaporator, and the refrigerant evaporates by exchanging heat with air. The refrigerant that has passed through the second heat exchanger 12b passes through the flow path switch 14 and is sucked into the compressor 11 again.

(Desorption operation mode: Air operation)
Next, the operation of air in the air passage 1 of the dehumidifier 100 in the desorption operation mode will be described with reference to FIG. The dehumidification target air (points 2-1 in FIG. 8,) introduced from the suction port 1a of the dehumidifier 100 flows into the first heat exchanger 12a. Here, the air to be dehumidified is heated by the first heat exchanger 12a functioning as a condenser, and the temperature rises (points 2-2 in FIG. 8). The air that has passed through the first heat exchanger 12 a flows into the moisture adsorption member 20. Here, since the relative humidity of the air heated by the first heat exchanger 12a is lower than the relative humidity of the air at the time of introduction, the adsorbent of the moisture adsorbing member 20 can easily desorb moisture. Moisture is desorbed (humidified) by the adsorbent of the moisture adsorbing member 20, and the low-temperature and high-humidity air (points 2-3 in FIG. 8) flows into the second heat exchanger 12b. Since the second heat exchanger 12b functions as an evaporator, the air passing through the second heat exchanger 12b is cooled to a dew point temperature or lower and dehumidified air from which moisture has been dehumidified (FIG. 8, 2-4 points). ) The air that has been cooled and dehumidified by the second heat exchanger 12b flows into the third heat exchanger 12c. Since the 3rd heat exchanger 12c is functioning as a condenser, the passing air is heated and temperature rises (FIG. 8, 2-5 points). The air that has passed through the third heat exchanger 12c is discharged from the air outlet 1b.

  As described above, in the present embodiment, when the first heat exchanger 12a or the second heat exchanger 12b is frosted, by switching the refrigerant flow path (operation mode) by the flow path switch 14, It is possible to defrost using the heat of condensation. Thereby, it becomes unnecessary to provide a heater for defrosting or to stop the compressor 11 for defrosting, and it becomes possible to reduce power consumption and defrosting time. In the desorption operation mode, dehumidification by the moisture adsorbing member 20 is not performed, and only dehumidification by the second heat exchanger 12b is performed. Therefore, in the present embodiment, the third heat exchanger 12c is provided to suppress the heat of condensation in the first heat exchanger 12a. This makes it possible to reduce the amount of moisture that cannot be captured by the second heat exchanger 12b.

  Next, switching of each operation mode will be described. The dehumidifying apparatus 100 of the present embodiment performs dehumidification of the air in the dehumidifying target space by alternately switching either the first adsorption operation mode or the second adsorption operation mode and the desorption operation mode. After performing the desorption operation mode, the control means 4 selects either the first adsorption operation mode or the second adsorption operation mode according to the temperature and humidity of the air to be dehumidified, and selects the selected operation mode. carry out. Hereinafter, a description will be given based on FIG.

  FIG. 9 is a flowchart showing an operation mode switching process according to Embodiment 1 of the present invention. When the operation start of the dehumidifying apparatus 100 starts, the control means 4 performs the desorption operation mode (S1). The control means 4 determines whether or not a predetermined time has elapsed based on the time measured by the time measuring means 5. If the predetermined time has not elapsed (S2: NO), the process returns to step S1. On the other hand, when the predetermined time has elapsed (S2: YES), the control means 4 acquires the temperature and humidity of the dehumidification target air from the temperature and humidity sensor 2a (S3).

  And the control means 4 acquires the temperature threshold value Tr and humidity threshold value RHr previously stored in the storage means 6, the temperature T of the dehumidification target air is lower than the temperature threshold value Tr, and the dehumidification target It is determined whether the humidity RH of the air is higher than the humidity threshold RHr (S4). Here, for example, the humidity threshold RHr is set to a humidity (for example, 80%) at which the equilibrium adsorption amount of the moisture adsorption member 20 can be sufficiently secured. Moreover, the temperature threshold value Tr is set to a temperature (for example, 15 ° C. to 20 ° C.) at which frost formation is likely to occur in the first heat exchanger 12a.

  In step S4, when the temperature T of the dehumidification target air is equal to or higher than the temperature threshold value Tr or the humidity RH of the dehumidification target air is equal to or lower than the humidity threshold value RHr (S4: NO), the control unit 4 performs the first adsorption operation. A mode is selected (S5). And the control means 4 switches a refrigerant | coolant flow path with the flow path switch 14, and implements 1st adsorption | suction operation mode.

  Next, the control means 4 determines whether or not the end condition for the first adsorption operation mode is satisfied (S6). If the end condition is satisfied, the process returns to step S1 and the control means 4 performs the desorption operation mode.

  As the end condition of the first adsorption operation mode, for example, it may be determined that the end condition is satisfied when a predetermined time has elapsed, or the end condition is satisfied when the first heat exchanger 12a detects frost formation. It may be determined that is established. The frost formation on the first heat exchanger 12a is frosted on the first heat exchanger 12a, for example, when it is determined that the wind speed detected by the wind speed sensor 3 has decreased below a reference value. Can be detected. The detection of frost formation is not limited to this. For example, when the low pressure of the refrigerant circuit 10 is lower than a predetermined value for a predetermined time or longer, the fin surface temperature of the first heat exchanger 12a is 0 ° C. You may detect that the following states continue and frost formation has occurred.

  On the other hand, when the temperature T of the dehumidification target air is lower than the temperature threshold value Tr and the humidity RH of the dehumidification target air is higher than the humidity threshold value RHr in step S4 (S4: YES), the control means 4 The second adsorption operation mode is selected (S7). In the second adsorption operation mode, the control unit 4 stops the operation of the compressor 11 and stops the circulation of the refrigerant in the refrigerant circuit 10. At this time, the control means 4 does not operate the flow path switch 14, and the flow path switching state remains the switching state in the desorption operation mode. As a result, the air to be dehumidified having a low temperature and high humidity passes through the first heat exchanger 12a without exchanging heat in the first heat exchanger 12a, and moisture is adsorbed by the adsorbent of the moisture adsorption member 20. The

  Next, the control means 4 determines whether or not the end condition for the second adsorption operation mode is satisfied (S8). When the end condition is satisfied (S8: YES), the process returns to step S1, and the control means 4 performs the desorption operation mode.

  As an end condition of the second adsorption operation mode, for example, when the temperature difference between the temperature detected by the temperature / humidity sensor 2a and the temperature detected by the second temperature / humidity sensor 2b falls below a preset temperature difference. It is determined that the end condition is satisfied. That is, when the temperature difference between the temperature of the air before passing through the moisture adsorption member 20 and the temperature of the air after passing through the moisture adsorption member 20 falls below a preset temperature difference, the second adsorption operation mode is set. When finished, switch to desorption mode. The determination based on such a temperature difference is because when the moisture adsorption amount of the moisture adsorption member 20 is saturated, a temperature change does not occur in the air passing through the moisture adsorption member 20. Note that not only the temperature but also the end condition when the humidity difference between the humidity of the air before passing through the moisture adsorbing member 20 and the humidity of the air after passing through the moisture adsorbing member 20 falls below a preset humidity difference. It may be determined that is established. The determination based on such a humidity difference is because when the moisture adsorption amount of the moisture adsorption member 20 is saturated, a change in humidity does not occur in the air passing through the moisture adsorption member 20. In the case where the determination based on the temperature difference or the humidity difference is not performed, the second temperature / humidity sensor 2b may be omitted.

  Note that the end condition of the second adsorption operation mode is not limited to these, and it may be determined that the end condition is satisfied when the operation time of the second adsorption operation mode has passed a predetermined time. For example, a sufficient time until the moisture adsorption amount of the moisture adsorption member 20 is saturated is set in advance. Further, for example, the time until the moisture adsorption amount of the moisture adsorption member 20 is saturated according to the specification and experimental data of the moisture adsorption member 20 is acquired in accordance with the temperature and humidity of the air, and the second adsorption operation mode is obtained. The predetermined time may be set according to the temperature and humidity at the start of the above.

  As described above, in the present embodiment, the control unit 4 alternately switches between the first adsorption operation mode or the second adsorption operation mode and the desorption operation mode. For this reason, the frequency | count of operation | movement of the flow path switch 14 can be suppressed. Further, in the second adsorption operation mode, the circulation of the refrigerant in the refrigerant circuit 10 is stopped, so that the air to be dehumidified passes through the first heat exchanger 12a without exchanging heat. For this reason, the frost formation in the 1st heat exchanger 12a does not generate | occur | produce, but it can suppress that an operation mode is switched frequently. Since the operation mode is not switched due to frost formation in the first heat exchanger 12a, the desorption operation mode is not switched before the moisture adsorbing member 20 sufficiently adsorbs moisture in the air. Can be suppressed.

  In the present embodiment, the control means 4 operates the flow path switch 14 when switching from the second adsorption operation mode to the desorption operation mode or when switching from the desorption operation mode to the second adsorption operation mode. I won't let you. For this reason, the switching frequency of the flow path switching device 14 can be reduced, a failure associated with an increase in the number of opening / closing operations can be suppressed, and the highly reliable dehumidifying device 100 can be provided.

  In the present embodiment, the control means 4 selects the first adsorption operation mode when the temperature of the dehumidification target air is equal to or higher than the preset temperature or when the humidity of the dehumidification target air is equal to or lower than the preset humidity. . Further, the control means 4 selects the second adsorption operation mode when the temperature of the dehumidifying target air is lower than the preset temperature and the humidity of the dehumidifying target air is higher than the preset humidity. That is, the second adsorption operation mode in which the dehumidification target air is not cooled is selected under the condition where the dehumidification target air is at low temperature and high humidity. For this reason, generation | occurrence | production of the frost formation to the 1st heat exchanger 12a can be suppressed, and it can suppress that a flow path switch (for example, four-way valve) operates frequently.

  Further, in the present embodiment, the control means 4 ends the second adsorption operation mode when the air temperature difference or humidity difference before and after passing through the moisture adsorbing member 20 falls below a preset value, and the desorption operation. Implement the mode. For this reason, when the adsorption amount in the moisture adsorption member 20 is saturated, the second adsorption operation mode can be switched to the desorption operation mode. Therefore, the second operation mode does not end before the moisture adsorbing member 20 sufficiently adsorbs moisture in the air, and a decrease in dehumidification efficiency can be suppressed.

Embodiment 2.
Next, the dehumidifying device 100 in Embodiment 2 of this invention is demonstrated. FIG. 10 is a schematic configuration diagram of the dehumidifying apparatus 100 according to the second embodiment. The dehumidifying device 100 according to the present embodiment is different from the first embodiment in that the third heat exchanger 12c is not provided. Other configurations of the dehumidifying apparatus 100 and operation mode switching processing are the same as those in the first embodiment. In the present embodiment, the refrigerant flows from the compressor 11 into the flow path switch 14, and thereafter flows through the refrigerant circulation path corresponding to the operation mode, as in the first embodiment.

  Also in the present embodiment, as in the first embodiment, the control unit 4 alternately switches between the first adsorption operation mode or the second adsorption operation mode and the desorption operation mode. For this reason, the frequency | count of operation | movement of the flow path switch 14 can be suppressed.

  The above is the description of the embodiment of the present invention. However, the present invention is not limited to the configuration of the above embodiment, and various modifications or combinations are possible within the scope of the technical idea.

  DESCRIPTION OF SYMBOLS 1 Air path, 1a Inlet, 1b Air outlet, 2a Temperature / humidity sensor, 2b 2nd temperature / humidity sensor, 3 Wind speed sensor, 4 Control means, 5 Time measuring means, 6 Memory | storage means, 10 Refrigerant circuit, 11 Compressor, 12a 1st heat exchanger, 12b 2nd heat exchanger, 12c 3rd heat exchanger, 13 decompression device, 14 flow path switch, 20 moisture adsorption member, 30 blower, 100 dehumidification device.

Claims (7)

A refrigerant circuit in which a compressor, a flow path switching unit that switches a refrigerant flow path, a first heat exchanger, a decompression device, and a second heat exchanger are sequentially connected by piping, and the refrigerant circulates;
A moisture adsorbing member disposed between the first heat exchanger and the second heat exchanger, for adsorbing moisture contained in the air flowing in the air passage and desorbing the adsorbed moisture;
A blower for flowing air in a dehumidification target space into the air path, wherein the blower flows air in the order of the first heat exchanger, the moisture adsorption member, and the second heat exchanger;
Before Symbol compressor, the flow path switching unit, and a control means for controlling said blower,
With
The control means includes
The refrigerant is supplied to the refrigerant circuit so as to control the flow path switch and the compressor so that the first heat exchanger functions as an evaporator and the second heat exchanger functions as a condenser. Circulating, operating the blower to flow the air in the dehumidification target space into the air path, and performing a first adsorption operation mode in which moisture is adsorbed by the moisture adsorption member;
The compressor is stopped to stop the circulation of the refrigerant, the blower is operated to cause the air in the dehumidification target space to flow into the air passage, and moisture is adsorbed by the moisture adsorption member. Adsorption operation mode,
The refrigerant is supplied to the refrigerant circuit so as to control the flow path switch and the compressor so that the first heat exchanger functions as a condenser and the second heat exchanger functions as an evaporator. Circulate, operate the blower to flow the air in the dehumidification target space into the air passage, and execute one of the operation modes of desorption operation mode in which the moisture adsorbed by the moisture adsorption member is desorbed Composed of
A dehumidifying device that alternately switches between the first adsorption operation mode or the second adsorption operation mode and the desorption operation mode. The control means includes
When switching from the second adsorption operation mode to the desorption operation mode, or
Wherein when the desorption operation mode switching to the second adsorption operation mode, a dehumidifying device according to claim 1 which does not operate the flow path switching unit. A temperature sensor for detecting the temperature of the dehumidifying target space;
A humidity sensor for detecting the humidity of the dehumidification target space,
The control means includes
When the temperature of the air is equal to or higher than a preset temperature or the humidity of the air is equal to or lower than a preset humidity, the first adsorption operation mode is selected,
The dehumidifying device according to claim 1 or 2 , wherein the second adsorption operation mode is selected when the temperature of the air is lower than a preset temperature and the humidity of the air is higher than a preset humidity. A second temperature sensor for detecting the temperature of the air after passing through the moisture adsorbing member;
The control means includes
The temperature of the air before passing through the moisture adsorbing member;
The dehumidifying device according to claim 3 , wherein when the temperature difference from the temperature of the air after passing through the moisture adsorbing member falls below a preset temperature, the desorption operation mode is switched. A second humidity sensor for detecting the humidity of the air after passing through the moisture adsorbing member;
The control means includes
The humidity of the air before passing through the moisture adsorbing member;
The dehumidifying device according to claim 3 or 4 , wherein when the humidity difference with the humidity of the air after passing through the moisture adsorbing member falls below a preset humidity, the desorption operation mode is switched. The control means includes
The dehumidifying device according to any one of claims 1 to 5, wherein when the operation time of the second adsorption operation mode exceeds a preset time, the operation mode is switched to the desorption operation mode. The refrigerant circuit further includes a third heat exchanger that is disposed between the compressor and the flow path switch and functions as a condenser,
The dehumidifier according to any one of claims 1 to 6, wherein the third heat exchanger is disposed downstream of the second heat exchanger in the air passage.

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