JP2016161197A - Dehumidifying and drying device and method for controlling dehumidifying and drying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dehumidifying and drying device of high versatility capable of controlling properly dehumidifying ability according to various required states of use of a space to be dehumidified.SOLUTION: When an increasing of relative humidity of a space to be dehumidified per unit time detected by a humidity sensor for detecting humidity exceeds a prescribed threshold (Yes at S1), when an operation for increasing an output of a compressor is carried out at an operating part (Yes at S2) or when it is detected that an opening or closing part is opened by an opening state detecting part for detecting an opened state of a room opening or closing part (Yes at S3), a set value R2 is set (S4) in which a revolution speed per unit time of the compressor is increased by a revolution speed variable part in comparison with that of no detection thereof.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a dehumidifying and drying apparatus and a method for controlling the dehumidifying and drying apparatus.

  2. Description of the Related Art Dehumidifying and drying apparatuses that perform indoor dehumidification drying in food factories, warehouses such as fish processing plants, and food storages are known. As background art of this technical field, there is JP-A-61-184382 (Patent Document 1). In this publication, “a humidity sensor for detecting the relative humidity value of the air in the drying chamber and a humidity controller having at least three relative humidity setting values, and a plurality of systems divided into two sets by the humidity controller. The dehumidifying / drying apparatus is configured to operate / stop the dehumidifying / drying apparatus so that the dehumidifying ability can be automatically controlled in three stages ”(refer to the claims).

JP-A-61-184382

The technology of Patent Document 1 automatically controls dehumidification capacity by operating and stopping a plurality of refrigerant systems by a humidity sensor that detects a relative humidity of air in a dehumidification target space by housing a plurality of refrigerant systems in the same housing. I try to do it.
However, the technique described in Patent Document 1 only changes the dehumidifying capacity based only on the detection value of the humidity sensor, and appropriately controls the refrigeration cycle corresponding to various usage modes to control the dehumidifying capacity. Is not fully considered.

  Then, this invention makes it a subject to provide the control method of a highly versatile dehumidification drying apparatus which can control a dehumidification capability appropriately according to the usage form of various dehumidification object space requested | required, and a dehumidification drying apparatus. To do.

  In order to solve the above-described problem, an aspect of the present invention provides an operation unit configured to operate the compressor when the increase in the relative humidity of the dehumidification target space detected by a humidity sensor that detects humidity exceeds a predetermined threshold. When an operation to increase the output is performed, or when the opening / closing part is detected to be opened by the opening detection part that detects that the opening / closing part of the room to be dehumidified is opened, compared to when it is not so The rotation speed control section increases the rotation speed per unit time of the compressor by the rotation speed variable section.

ADVANTAGE OF THE INVENTION According to this invention, the versatile dehumidification drying apparatus which can control a dehumidification capability appropriately according to the usage condition of various dehumidification object space requested | required, and the control method of a dehumidification drying apparatus can be provided.
Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

FIG. 1 is an explanatory diagram showing a configuration example of a refrigeration cycle of a dehumidifying and drying apparatus according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view for explaining the arrangement of equipment inside the dehumidifying / drying apparatus according to an embodiment of the present invention. FIG. 3 is a block diagram showing the electrical connection of the control system centering on the controller of the dehumidifying and drying apparatus according to the embodiment of the present invention. FIG. 4 is a plan view of an example of a room serving as a dehumidifying target space of the dehumidifying / drying apparatus according to the embodiment of the present invention. FIG. 5 is a flowchart for explaining processing executed by the rotation speed control unit of the dehumidifying / drying apparatus according to the embodiment of the present invention. FIG. 6 is a flowchart for explaining processing executed by the rotation speed control unit of the dehumidifying / drying apparatus according to the embodiment of the present invention. FIGS. 7A and 7B are explanatory diagrams for explaining the effect of the process executed by the rotation speed control unit of the dehumidifying / drying apparatus according to the embodiment of the present invention, in which FIG. The time change of the rotation speed is shown. FIG. 8 is an explanatory view for explaining the action by the process executed by the rotation speed control unit of the dehumidifying and drying apparatus according to the embodiment of the present invention. FIG. 9 is an explanatory view for explaining the effect of the process executed by the rotational speed control unit of the dehumidifying / drying apparatus according to the embodiment of the present invention. Indicates the change in relative humidity over time.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an explanatory diagram illustrating a configuration example of a refrigeration cycle of the dehumidifying and drying apparatus according to the present embodiment. As shown in FIG. 1, the dehumidifying and drying apparatus 1 comprises a refrigeration cycle in which a compressor 2, a condenser 3, an expansion valve 4, an evaporator 5 and the like are connected by a refrigerant pipe 6. That is, the high-pressure refrigerant gas compressed and discharged by the compressor 2 is cooled and condensed by the condenser 3 to become a high-pressure liquid refrigerant. This high-pressure liquid refrigerant is expanded by the expansion valve 4, the low-temperature and low-pressure liquid refrigerant (gas-liquid mixed refrigerant) is evaporated by the evaporator 5, and the subsequent low-pressure refrigerant gas is again sucked into the compressor 2. The dehumidifying / drying apparatus 1 uses such a refrigeration cycle to lower the surface temperature of the evaporator 5 below the dew point temperature of the air passing through the evaporator 5, thereby causing moisture in the air to condense on the evaporator 5. To dehumidify and dry.

  FIG. 2 is a longitudinal sectional view for explaining the arrangement of equipment inside the dehumidifying and drying apparatus of this embodiment. A compressor 2 is disposed in the lower part of the housing 11 of the dehumidifying / drying apparatus 1, and the capacity of the dehumidifying / drying apparatus 1 is varied by varying the number of rotations (rotational speed) per unit time of the compressor 2. An inverter 12 serving as a rotation speed variable unit is also arranged.

  A suction port 10 for sucking air in a dehumidifying target space is provided on a side portion of the housing 11, and an air outlet 14 for blowing out the air is provided on an upper portion of the housing 11. The suction of air from the suction port 10 and the blow-out of the air from the blower outlet 14 are performed by a blower 15 provided at the upper part in the housing 11. The suction port 10 is provided with a humidity sensor 16 that detects the relative humidity of the air. The air flow in this case is indicated by an arrow a.

  An evaporator 5 that cools the air by evaporating the refrigerant is disposed in the middle of the air flow path between the suction port 10 and the air outlet 14, and the condenser 3 is disposed downstream of the evaporator 5. Yes. That is, the condenser 3 cools the refrigerant with the air that has been dehumidified and dried by the evaporator 5. Thus, since the air blown out from the dehumidifying and drying apparatus 1 passes through the condenser 3, the dehumidifying and drying apparatus 1 has a higher temperature and lower relative to the sucked air (than the air cooled by the evaporator 5). Blow out humid air (reheat dehumidification).

The controller 17 is a control device that is configured mainly with a microcomputer or the like, and that centrally controls the entire dehumidifying and drying apparatus 1.
The operation unit 18 is an operation panel that receives various operations of the dehumidifying / drying apparatus 1.

FIG. 3 is a block diagram showing electrical connection of the control system with the controller 17 as the center. The controller 17 has a function of a rotation speed control unit 21 that controls the inverter 12 to vary the rotation speed per unit time of the compressor 2 (details of the control contents will be described later).
In addition to the inverter 12, the humidity sensor 16, and the operation unit 18, an open detection unit 31 is connected to the controller 17. Next, the open detection unit 31 will be described.

  FIG. 4 is a plan view of an example of a room serving as a dehumidifying target space of the dehumidifying / drying apparatus 1. In this room 101, a dehumidifying and drying object 102 is placed. A dehumidifying and drying apparatus 1 is installed at one corner of the room 101. An opening / closing part (such as a door) 103 of the room 101 is provided at the other corner of the room 101 that forms a diagonal line with the corner of the dehumidifying / drying apparatus 1. The opening detection unit 31 is a sensor that detects that the opening / closing unit 103 is opened. The open detection unit 31 can be realized by using various sensors such as an optical sensor and various switches.

Next, the contents of the control performed by the rotation speed control unit 21 of the controller 17 will be described. First, problems to be solved by such control will be described.
The technology of Patent Document 1 automatically controls dehumidification capacity by operating and stopping a plurality of refrigerant systems by a humidity sensor that detects a relative humidity of air in a dehumidification target space by housing a plurality of refrigerant systems in the same housing. I try to do it.

Here, the required dehumidifying capacity (the load on the apparatus) varies depending on the situation such as the season, but in the technique described in Patent Document 1, a number of dehumidifying and drying apparatuses are installed in the dehumidifying target space to reduce the load on the apparatus. You must be prepared for growth. In other words, installing a number of dehumidifying and drying devices at a time when the load on the device is small is over-specification, resulting in an increase in equipment cost.
Further, in the technique described in Patent Document 1, when the relative humidity of the dehumidifying target space changes abruptly, the humidity changes so that the humidity sensor can detect in a space where the humidity sensor is installed at a position far from the part. Since it takes time to do so, the humidity control of the space may not be performed properly.

Furthermore, even if there is a request to rapidly reduce the relative humidity of the dehumidification target space, the technique described in Patent Document 1 cannot sufficiently cope with it.
In other words, the technique described in Patent Document 1 has a problem in that it does not consider versatility that can control the dehumidification capability corresponding to various usage patterns of the dehumidification target space.

  Next, the control of the present embodiment for solving such a problem will be described. 5 and 6 are flowcharts for explaining the contents of the control executed by the rotation speed control unit 21. First, as shown in FIG. 5, the rotation speed control unit 21 increases the relative humidity of the dehumidifying target space detected by the humidity sensor 16 per unit time (the value obtained by dividing the fluctuation value Δx of the relative humidity by the unit time Δt). It is determined whether or not (in the case of a positive value) exceeds a predetermined threshold (Δx / Δt> threshold) (S1). When the increase in relative humidity per unit time exceeds the threshold (Yes in S1), the rotation speed control unit 21 sets the set value R2 (S4).

  When the increase in relative humidity per unit time is equal to or lower than the threshold (No in S1), the rotation speed control unit 21 determines whether the operation unit 18 has been operated to increase the output of the compressor 2 by the user. Is determined (S2). That is, the operation unit 18 is provided with a button for manually instructing an increase in the output of the compressor 2. When the operation unit 18 is operated to increase the output of the compressor 2 (Yes in S2), the rotation speed control unit 21 sets the set value R2 (S4).

When the operation unit 18 is not operated to increase the output of the compressor 2 (No in S2), the rotational speed control unit 21 detects that the opening / closing unit 103 such as a door is opened by the opening detection unit 31. Whether or not (S3). When the opening / closing unit 103 is opened (Yes in S3), the rotation speed control unit 21 sets the set value R2 (S4).
When the opening / closing unit 103 is closed (No in S3), the rotation speed control unit 21 sets the set value R1 (S5).

  Here, the set values R1 and R2 are both set values for setting the maximum value of the output of the compressor 2 (the maximum value of the rotation speed per unit time), and “R1 <R2”. Therefore, the dehumidifying / drying apparatus 1 maintains the dehumidifying and drying performance generally higher when the set value R2 is set than when the set value R1 is set. The controller 17 feedback-controls the inverter 12 and thus the compressor 2 so that the relative humidity detected by the humidity sensor 16 becomes the target relative humidity within the set value R1 or the set value R2, and in the dehumidifying target space. A room 101 is dehumidified and dried. The dehumidifying and drying apparatus 1 is normally set at the set value R1 and is operated at a relatively low output, and the set value R2 is satisfied when the S1 Yes, S2 Yes, or S3 Yes conditions are satisfied. Will be set and operation will be performed at a relatively high output.

  Next, as shown in FIG. 6, when the set value R2 is set in S4 (Yes in S11), the rotational speed control unit 21 determines whether the relative humidity detected by the humidity sensor 16 is below the reference value. It is determined whether or not (S12). When the relative humidity is lower than the reference value (Yes in S12), the rotation speed control unit 21 sets a set value R1 instead of the set value R2 (S15).

  When the relative humidity is equal to or higher than the reference value (No in S12), the rotation speed control unit 21 determines whether or not an operation for reducing the output of the compressor 2 has been performed by operating the operation unit 18 by the user. Judgment is made (S13). When an operation for reducing the output of the compressor 2 is performed (Yes in S13), the rotation speed control unit 21 sets the set value R1 instead of the set value R2 (S15).

When an operation for reducing the output of the compressor 2 is not performed (No in S13), the rotational speed control unit 21 determines whether or not a predetermined time has elapsed since the set value R2 was set (S14). . When the predetermined time has elapsed since the setting value R2 was set (Yes in S14), the rotation speed control unit 21 sets the setting value R1 instead of the setting value R2 (S15). When the predetermined time has not elapsed since the setting value R2 was set (No in S14), the process returns to S11.
Thus, even if the set value R2 is set by S4 and the relatively high output operation is started, when the conditions of Yes in S12, Yes in S13, and Yes in S14 are satisfied, the setting value R1 is returned. Return to normal low power operation.

  The above control will be described individually. First, as shown in FIG. 4, when the opening / closing part 103 of the room 101 serving as the dehumidifying target space is opened, the humidity in the indoor region 111 near the opening / closing part 103 rapidly increases. On the other hand, the region 112 far from the opening / closing unit 103 and close to the dehumidifying and drying apparatus 1 is sufficiently dehumidified and dried.

As shown in FIG. 7, when the opening detection unit 31 detects that the opening / closing unit 103 is opened as described above, the set value R2 is set by S4 at the time of t1 (in the case of Yes of S3), and the output is relatively high. It shifts to the driving | operation (FIG.7 (b)). In this case, as indicated by an arrow b in FIG. 4, since the high humidity outside air enters the room 101, the area 111 rapidly increases in relative humidity, but the area 112 far from the opening / closing portion 103 indicates relative humidity. The rise is moderate. Thus, a region difference occurs in the relative humidity, and FIG. 7A shows the relative humidity c1 in the region 111 and the relative humidity c2 in the region 112. There is a difference between the relative humidity c1 and the relative humidity c2.
However, since the set value R2 is set at the time t1 when it is detected that the opening / closing part 103 is opened, the dehumidifying and drying apparatus 1 shifts to a relatively high output operation, and thereafter, as shown in FIG. As described above, the difference between the relative humidity c1 and the relative humidity c2 is quickly eliminated, and both the relative humidity become the relative humidity c3, and the relative humidity decreases.

  Further, as indicated by reference sign d1 in FIG. 8, when the rate of change in relative humidity (Δx / Δt) detected by the humidity sensor 16 exceeds a predetermined threshold, a set value R2 is set (in the case of Yes in S1) ), Shift to a relatively high output operation (S4). As described above, when the relative humidity suddenly increases due to some fluctuation, the operation shifts to a relatively high output operation, so that the relative humidity can be rapidly lowered as indicated by reference numeral d2 in FIG.

  As shown in FIG. 9, when the user of the dehumidifying / drying apparatus 1 determines that the relative humidity of the dehumidifying target space is high even when the user operates at the normal set value R1, as shown in FIG. 9 (a). In addition, if an operation for increasing the output is performed by the operation unit 18 at the time indicated by t2, the set value R2 is set (in the case of Yes in S2), and the operation shifts to a relatively high output. Therefore, as shown in FIG. 9B, the relative humidity subsequently decreases (reference e).

As described above, according to the process of FIG. 5 described above, the output of the dehumidifying / drying apparatus 1 can be enhanced in an appropriate situation where the output of the dehumidifying / drying apparatus 1 should be increased, and the dehumidifying / drying of the dehumidifying target space can be performed strongly.
Next, the significance of the processing of FIG. 6 will be described with reference to FIG. When the set value R2 is set by the process of FIG. 5 and the dehumidification target space is strongly dehumidified and dried, the process of FIG. 6 appropriately gives the timing for returning to the set value R1 that is the normal operation.

  That is, when the set value R2 is set and the dehumidification / drying is performed strongly, and the relative humidity of the dehumidification target space has decreased to such an extent that the user may return the output of the dehumidification / drying apparatus 1 to the normal operation. Then, an operation for reducing the output is performed by the operation unit 18 (at time t3 in FIG. 9A) (Yes in S13). As a result, the set value R2 is changed to the set value R1, and the normal operation is resumed.

In addition, when the relative humidity detected by the humidity sensor 16 falls below a predetermined reference value (at time t3 in FIGS. 9A and 9B) (Yes in S12), the relative humidity has sufficiently decreased. Then, the set value R2 is changed to the set value R1, and the normal operation is resumed.
Furthermore, as shown in FIG. 9A, when the predetermined time T has elapsed from the time t2 when the set value R2 is set (time t3 in FIG. 9A) (Yes in S14), the set value Since the high output operation by R2 is continued for an appropriate period of time and the relative humidity is sufficiently reduced, the set value R2 is changed to the set value R1, and the normal operation is resumed.

As described above, according to the present embodiment, the dehumidifying / drying capacity of the dehumidifying / drying apparatus 1 is appropriately increased in accordance with various situations in which the relative humidity of the dehumidifying target space is increased, thereby sufficiently increasing the relative humidity of the dehumidifying target space. When it is lowered, the dehumidifying / drying capacity of the dehumidifying / drying apparatus 1 can be appropriately returned to the normal operation.
Therefore, according to the present Example, the versatile dehumidification drying apparatus 1 which can control a dehumidification capability appropriately according to the usage form of the various dehumidification object space requested | required can be provided.

In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.
For example, in the example described above, an example in which only one type of set value R2 is used has been described. However, a plurality of set values R2 having different rotational speeds per unit time of the compressor 2 may be used depending on the situation. .

DESCRIPTION OF SYMBOLS 1 Dehumidification drying apparatus 2 Compressor 3 Condenser 4 Expansion valve 5 Evaporator 12 Inverter (rotation speed variable part)
16 Humidity Sensor 18 Operation Unit 21 Rotational Speed Control Unit 31 Opening Detection Unit 101 Room 103 Opening / Closing Unit

Claims (3)

A compressor for compressing the refrigerant;
A condenser that cools and condenses the refrigerant compressed by the compressor;
An expansion valve for expanding the refrigerant condensed in the condenser;
An evaporator that cools air with a refrigerant expanded by the expansion valve, dehumidifies and dries, and then the vaporized refrigerant becomes a refrigerant that is compressed by the compressor;
A rotation speed variable unit that varies the rotation speed per unit time of the compressor;
The condenser cools the refrigerant with the air after being dehumidified and dried by the evaporator,
When an increase per unit time in relative humidity of the dehumidifying target space detected by a humidity sensor that detects humidity exceeds a predetermined threshold, when an operation is performed to increase the output of the compressor at the operation unit, or When it is detected that the opening / closing part is opened by the opening detection part that detects that the opening / closing part of the room to be dehumidified is opened, the rotation speed variable part of the compressor is compared with the case where the opening / closing part is not opened. A dehumidifying and drying apparatus comprising a rotation speed control unit for increasing the rotation speed per unit time.   When the relative humidity detected by the humidity sensor falls below a predetermined reference value after the rotation number control unit starts increasing the rotation number, the operation unit performs an operation to decrease the output of the compressor. 2. The dehumidifying and drying apparatus according to claim 1, wherein when it is made or when a predetermined time has elapsed, the rotational speed of the compressor is reduced from the rotational speed increased by the rotational speed increase control unit. . A compressor for compressing the refrigerant;
A condenser that cools and condenses the refrigerant compressed by the compressor;
An expansion valve for expanding the refrigerant condensed in the condenser;
An evaporator that cools air with a refrigerant expanded by the expansion valve, dehumidifies and dries, and then the vaporized refrigerant becomes a refrigerant that is compressed by the compressor;
A rotation speed variable unit that varies the rotation speed per unit time of the compressor;
The condenser is a control method of a dehumidifying and drying device that cools the refrigerant with the air after being dehumidified and dried by the evaporator,
When an increase per unit time in relative humidity of the dehumidifying target space detected by a humidity sensor that detects humidity exceeds a predetermined threshold, when an operation is performed to increase the output of the compressor at the operation unit, or When it is detected that the opening / closing part is opened by the opening detection part that detects that the opening / closing part of the room to be dehumidified is opened, the rotation speed variable part of the compressor is compared with the case where the opening / closing part is not opened. A method for controlling a dehumidifying and drying apparatus, comprising a step of increasing the number of revolutions per unit time.

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