JP3037082B2 - Constant temperature and humidity device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant-temperature and constant-humidity device in which a storage room formed in an inner box is set to a constant-temperature and constant-humidity environment.

[0002]

2. Description of the Related Art Conventionally, a thermo-hygrostat for fermenting bread dough or the like is disclosed in, for example, Japanese Patent Application Laid-Open No. 6-14690 (A21C13 / 00). A storage room (fermentation room) is formed in the box, a humidification heat source room is formed on one side of the inner box, and a heated air circulation fan, a heater and a humidifier are installed therein, A cooler for circulating cool air and a blower are provided in a cooling chamber on one side of the inner box communicating with the cool air circulating path.

[0003] Air (heated air) heated by the heater and humidified by the humidifier is circulated from the other side of the inner box into the storage room by the heated air circulation fan through the heated air passage to heat the storage room. -In addition to humidifying, cool air that has exchanged heat with the cooler is circulated in the cool air circulation path by a blower for circulating cool air to indirectly cool the storage room from the inner box wall. Also, by operating the blower for dehumidification, and by opening the damper, the cool air in the cool air circulation path is directly introduced into the storage room, and by dehumidifying the storage room, it is suitable for fermentation of bread dough and the like in the storage room. It constituted a constant temperature and humidity environment.

[0004]

The compressor, which constitutes a refrigerating device together with a cooler, is operated when it is necessary to dehumidify the inside of the storage room during the fermentation operation of bread dough or the like. Conventionally, the blower has been operated continuously. As a result, the temperature of the cooler rises while the compressor is stopped,
There was a problem that the humidity in the cold air circulation path was increased, and the required dehumidifying ability was not obtained in the initial stage of opening the damper to start the dehumidification, thereby increasing the humidity in the storage room.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional technical problem, and it is an object of the present invention to effectively dehumidify a storage room when it is necessary to prevent the increase in the humidity in the storage room. It is an object of the present invention to provide a constant temperature / humidity device capable of performing the following.

[0006]

According to a first aspect of the present invention, there is provided a thermo-hygrostat, comprising: a heat-conductive inner box provided in a heat-insulating box;
A cool air passage formed between the inner box and the heat insulating box, a storage room formed in the inner box, a cooler of a refrigerating device provided in the cool air passage, and cold air that has exchanged heat with the cooler. A cooling fan circulating in the cool air passage, a cool air introduction control means for controlling the introduction of cool air from the cool air passage into the storage room, a humidity sensor for detecting humidity in the storage room, and introducing cool air based on an output of the humidity sensor. A control unit and a control unit for controlling the cooling fan and the compressor of the refrigerating device are provided. The control unit operates the compressor and the cooling fan when dehumidification in the storage room is required, and introduces cool air. The control means introduces cool air into the storage chamber, and when dehumidification is not necessary, stops the compressor and the cooling fan to stop the introduction of cool air by the cool air introduction control means.

In the constant temperature and humidity apparatus according to the second aspect of the present invention, when the operation of the compressor and the cooling fan is started, the cooling fan is started later than the compressor.

According to a third aspect of the present invention, there is provided a constant temperature and humidity apparatus comprising: a heat conductive inner box provided in a heat insulating box; a cold air passage formed between the inner box and the heat insulating box; A cooler of a refrigerating device provided in the cool air passage, a cooling fan that circulates cool air that has exchanged heat with the cooler into the cool air passage, and cool air from the cool air passage to the storage room. A cool air introduction control means for controlling the introduction of the air, a humidity sensor for detecting the humidity in the storage room, and a control apparatus for controlling the cool air introduction control means, the cooling fan and the compressor of the refrigerating device based on the output of the humidity sensor. This control device operates the compressor when the humidity in the storage room rises below a predetermined rate of increase and reaches a set value , and introduces cool air into the storage room by cool air introduction control means, on humidity rate of increase is given during the stop of the compressor When the rate is larger than is intended to operate the compressor before reaching the set value <br/>.

According to a fourth aspect of the present invention, there is provided a constant temperature and humidity apparatus comprising: a heat conductive inner box provided in a heat insulating box; a cold air passage formed between the inner box and the heat insulating box; A cooler of a refrigerating device provided in the cool air passage, a cooling fan that circulates cool air that has exchanged heat with the cooler into the cool air passage, and cool air from the cool air passage to the storage room. A cool air introduction control means for controlling the introduction of a cooler temperature sensor for detecting the temperature of the cooler, a humidity sensor for detecting the humidity in the storage room, a cool air introduction control means and a cooling fan based on the outputs of both sensors A control device for controlling the compressor of the refrigerating device, the control device operates the compressor when dehumidification in the storage room is necessary, and introduces cool air into the storage room by the cool air introduction control means, When the temperature of the cooler is lower than the specified value Increases the rotation speed of the cooling fan, when high those to reduce the rotational speed.

According to the constant temperature and humidity apparatus of the first aspect of the present invention,
When dehumidification in the storage room is necessary, the compressor and the cooling fan are operated, cool air is introduced into the storage room by the cool air introduction control means, and when dehumidification is not required, the compressor and the cooling fan are stopped. Since the introduction of the cool air by the cool air introduction control means is stopped, the cooling fan is also stopped while the compressor is stopped, so that the heat exchange of the cooler is reduced and its temperature rise is suppressed. Therefore, the dehumidifying ability at the beginning of the next dehumidification start can be ensured, and a rise in the humidity in the storage room can be avoided.

In particular, according to the constant temperature and humidity apparatus according to the second aspect of the present invention, when the compressor and the cooling fan are started to operate, the cooling fan is started later than the compressor, so that the storage room is stored. When the dehumidification is started, the temperature of the cooler is first lowered, the cooling fan is started, and the cool air introduction control means can introduce cold air with low temperature and low humidity into the storage room. Therefore, it is possible to effectively dehumidify the inside of the storage room at the beginning of the dehumidification start, and it is possible to more effectively prevent a rise in humidity in the storage room.

According to the constant temperature and humidity apparatus of the third aspect of the present invention,
When the humidity in the storage room rises below a predetermined rate and reaches a set value , the compressor is operated, cool air is introduced into the storage room by the cool air introduction control means, and the humidity rises while the compressor is stopped. If the rate is greater than the prescribed rate of increase, the storage room
The compressor was operated before the inside humidity reached the set value.If the humidity suddenly increased, start the compressor operation early, and immediately start dehumidification when the dehumidification started. It is possible to exert its capacity, and thereby it is possible to effectively prevent an abnormal increase in the humidity of the storage room.

According to the constant temperature and humidity apparatus of the invention of claim 4,
The compressor is operated when dehumidification in the storage room is required, and cool air is introduced into the storage room by the cool air introduction control means, and when the temperature of the cooler is lower than a predetermined value, the rotation speed of the cooling fan is increased. When the temperature is high, the rotation speed is reduced, so that the temperature at which the dehumidifying capacity of the cooler is maximized is set to the predetermined value, and when the temperature is lower than that, the rotation speed of the cooling fan is increased. Increase the temperature of the cooler,
In the case of high temperature, the temperature of the cooler can be maintained at the above-mentioned predetermined value by lowering the rotation speed and lowering the temperature, thereby always ensuring the maximum dehumidifying capacity and effectively increasing the humidity in the storage room. It is possible to prevent it.

[0014]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a vertical sectional front view of a thermo-hygrostat 1 of the present invention, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG.
FIG. 4 is a block diagram of a control device 60 of the thermo-hygrostat 1. In each figure, a constant temperature and humidity apparatus 1 of the embodiment is installed in a kitchen of a restaurant or the like and performs each operation of cryopreservation, thawing, preheating, and fermentation of bread dough and the like as described below, and heat insulation such as foamed polyurethane. The main body 3 is constituted by a heat-insulating box 2 which is formed of a material and has an opening at the front. Outside the heat-insulating box 2 at the lower part of one side of the main body 3, a machine room 4 in which a compressor CP, a condenser CD, a condenser fan CF, and the like constituting a refrigeration apparatus are installed is formed. The front face of 4 is closed by a grill 7 so that it can be opened and closed freely.

On the other hand, the front opening of the heat insulating box 2 constituting the main body 3 is openably and closably closed by a heat insulating door 8 having a vertically long glass G at the center. A gasket 9 is attached around the inner surface of the heat insulating door 8, and the gasket 9 is in close contact with the periphery of the opening of the heat insulating box 2. Also, at the four corners of the lower surface of the main body 3, legs (pedestal) 11 projecting downward are provided.
・ ・ Is attached.

On the other hand, an inner box 21 made of thermally conductive stainless steel or the like, which is opened forward at an interval from the inner wall surface of the heat insulating box 2 and is accommodated in the heat insulating box 2, is provided. Spacers 13, 13 for maintaining a space between the inner box 21 and the inner wall surface of the heat-insulating box 2 are attached to the lower part of the inner box 21, and a plurality of through holes 14 are formed in each spacer 13. I have. Further, an upper duct plate 23 and a rear duct plate 24 forming a series of warm air passages 22 extending from the rear portion to the upper portion in the inner box 21 are attached to the upper portion and the rear portion of the inner box 21. The space surrounded by the inner box 21, the upper duct plate 23, and the rear duct plate 24 is a storage room 25. The inner box 2 forming both side walls of the storage room 25
A plurality of rails 30... Are attached to the inner surfaces of both sides of 1.

The front end of the warm air passage 22 is opened downward at a communication outlet 26 formed in an upper duct plate 23 located on the upper inside of the heat insulating door 8.
Are attached to the inner surfaces on both sides (surface on the storage room 25 side) of the air conditioner at the upper end thereof. The air direction duct plates 28, 28 are provided with air direction duct inlets 27 facing the communication outlets 26. Ducts 29, 29 are configured. The wind direction duct plate 28 includes a plurality of wind direction plates 31 protruding toward the heat insulating door 8.
And a plurality of outlets 32 opened in the storage room 25 corresponding to the rear of each wind direction plate 31 and a plurality of outlets 33 opened in the side surface on the glass G side. The wind direction plates 31 extend left and right, are attached at predetermined intervals above and below, and are configured such that the lower the lower one, the greater the projection width.

Further, in the through-holes 35 formed in the rear duct member 24, fans 34, 34 for circulating in the refrigerator are mounted at the boundary between the storage room 25 and the warm air passage 22, respectively. Humidifier 36 in the lower left inside
Is provided. The humidifier 36 includes a humidification tank 37 for storing humidification water and a humidification heater 38 for heating the humidification tank 37. A heating heater 41 is provided in the warm air passage 22 above the humidifier 36.

The upper part of the left side of the heat insulating box 2 is open,
An auxiliary heat insulator 39 located above the machine room 4 is attached so as to close this opening from the outside. In the auxiliary heat insulator 39, the cooling chamber 4 is located outside the inner box 21.
2 and a cooler 4 constituting the refrigeration apparatus
3 and a cooling fan 44 are provided. Between the inner box 21 and the heat-insulating box 2, a cool air passage 46 surrounding the periphery of the inner box 21 excluding the front is formed, and the cooling chamber 42 communicates with the cool air passage 46.

A cooling chamber 42 is provided on the left shoulder of the inner box 21.
A cold air passage partitioning plate 45 for partitioning the inside of the cold air passage 46 into a discharge side and a suction side. Furthermore, the inner box 21
A partition plate 47 is also attached between the ceiling of the upper duct plate 23 and the upper duct plate 23, and a through hole 50 formed in the inner box 21 and a cool air passage 46 formed in the upper duct plate 23 through the cool air passage 46 and the storage room 25. Is in direct communication. Further, a dehumidifying fan 49 as a cool air introduction control means is attached to the through hole 50 above the cool air inlet 48.

A through-hole 51 is also formed in the lower right part of the rear duct plate 24, and the rear of the through-hole 51 (the humidifier 3).
The warm air passage 22 located on the right side of FIG. 6 is separated from other parts by a partition plate 52. A discharge port 54 communicating with the cool air passage 46 is formed in the inner box 21 at a position corresponding to the rear of the through hole 51, and the discharge port 54 is electrically operated as a cool air introduction control means for opening and closing the discharge port. A damper 56 is provided.

The positions of the electric damper 56 and the dehumidifying fan 49 may be interchanged. In addition, since the heater 41 for heating, the humidifier 36, the electric damper 56 (or the fan 49 for dehumidification) and the fans 34 for circulation in the refrigerator are arranged on the rear surface inside the inner box 21 as described above, the worker is required to assemble at the time of assembly. The mounting work can be performed as it is while facing the inner box 21, and the assembly workability is remarkably improved as compared with the conventional case where the work is mounted on the side part.

Next, in FIG. 4, the control device 60 of the thermo-hygrostat 1 is constituted by a general-purpose microcomputer 61 having a timer function, and the microcomputer 61 detects the temperature in the storage room 25. Temperature sensor 62, a humidity sensor 63 for detecting humidity in the storage room 25
The output of the cooler temperature sensor 64 for detecting the temperature of the cooler 43 is input. The output of the microcomputer 61 includes the motor CM of the compressor CP, the motor 49M of the dehumidifying fan 49, and the motor 5 of the electric damper 56.
6M, motors 34M for the circulation fans 34, 34, 3M
4M, a heater 41 for heating and a heater 38 for humidification are connected.

The output of the microcomputer 61 is connected to an inverter 66 as a frequency converter.
The output of the inverter 66 is connected to the motor 44M of the cooling fan 44. The inverter 66 adjusts the number of revolutions of the motor 44M of the cooling fan 44 by varying the output frequency based on the output of the microcomputer 61.

The operation of the constant-temperature and constant-humidity device 1 having the above configuration will be described. Food (not shown) to be fermented, for example, frozen bread dough, is placed side by side on a screen (not shown) that allows air to flow, and this screen is laid on rails 30 and 30 in the storage room 25 and is placed in the storage room 25. To store.
For example, if the frozen dough is stored in the storage room 25 at midnight and the user sets the fermentation finish at, for example, 6:00 in the early morning in the microcomputer 61, the microcomputer 61 first detects the temperature sensor 62. The compressor CP based on the temperature in the storage chamber 25
(Motor CM) and cooling fan 44 (motor 44M)
To drive.

The operation of the compressor CP causes the cooler 43 to perform a cooling action. The low-temperature and low-humidity cool air cooled by the cooler 43 is sucked by the cooling fan 44 and is cooled around the inner box 21. The passage 46 circulates clockwise in FIG. 1 to indirectly cool the inside of the storage room 25 from the wall surface of the inner box 21. By controlling the motor 56M and opening the discharge port 54 by the electric damper 56, the cool air is
8 also flows into the storage room 25. The microcomputer 61 operates the compressor CP and the cooling fan 44 based on the temperature in the storage room 25 so that the temperature of the storage room 25 becomes, for example, −10 ° C., thereby keeping the dough in a frozen state.

Then, for example, at 4:20 am,
The microcomputer 61 causes the heating heater 41 to generate heat based on the temperature in the storage room 25, operates the circulation fans 34, 34 (motor 34 M), and causes the humidification heater 38 to generate heat to humidify. And start thawing the dough. By the operation of the internal circulation fans 34, 34, the air (heated air) heated by the heating heater 41 and humidified by the humidifier 36 passes through the warm air passage 22 from the communication outlet 26 to the wind direction duct inlet. From 27 enters the air duct 29.

The air (heated air) supplied into the wind direction duct 29 on the inner surface of the heat-insulating door 8 (the surface on the storage room 25 side) flows down along the inner surface of the heat-insulating door 8 and sequentially passes through each wind direction plate 31. Are discharged into the storage chamber 25 from the discharge ports 32. Here, in the gasket 9 portion on the inner surface of the heat-insulating door 8, heat leakage to the outside is large and the temperature tends to decrease, but in the embodiment, since air (heating air) is discharged from the inner surface of the heat-insulating door 8, The temperature drop on the inner surface of the heat insulating door 8 is eliminated, and the storage room 25
The temperature inside can be made uniform. Therefore, the thawing of the dough and the preheating / fermentation to be described later can be performed uniformly. In particular, in the embodiment, since the projecting width of the wind direction plates 31... Is increased in the lower part farther from the communication outlet 26, the air discharge amount from each discharge port 32.

Further, since the heat insulating performance of the glass G of the heat insulating door 8 is lower than that of the other parts, the humidifier 3 is provided on the inner surface of the glass G.
6, the moisture (humidified air) is condensed and adheres to the glass G. In the embodiment, the air (heated air) is also discharged toward the glass G from the discharge ports 33 on the glass G side.
Is also eliminated, and the visibility in the storage room 25 is improved.

The microcomputer 61 controls the energization of the heating heater 41 so that the temperature of the storage room 25 becomes, for example, + 22 ° C. during the thawing. This thawing operation is continued for 40 minutes, the temperature of the storage room 25 and the temperature of the dough increase, and when the thawing of the frozen dough ends, for example, at 5:00 am, the microcomputer 61 sets the temperature of the storage room 25 to the next time. The dough is preheated by controlling the heating heater 41 so as to be + 28 ° C. This preheating operation is continued for 20 minutes, and the temperature of the storage room 25 and the temperature of the dough rise. At 5:20 am after elapse of 20 minutes, the microcomputer 61 controls the heat generation of the heating heater 41 so that the temperature of the storage room 25 becomes + 40 ° C. to promote fermentation by yeast in the dough. Let it. The fermentation operation of the dough is performed for 40 minutes, and the fermentation operation is completed at 6:00 am set in advance.

Next, the control of the humidity H in the storage room 25 of the microcomputer 61 in the thawing-preheating-fermentation operation will be described with reference to FIGS. 5 and 6 show a program of the microcomputer 61. For example, the microcomputer 61 has set the humidity setting value of the storage room 25 to, for example, 60%, and the microcomputer 61 sets the humidity setting upper limit value (for example, 62%) and the humidity setting lower limit value above and below this humidity setting value. For example, 58%) is set.

When the humidity H is lower than the humidity set value and reaches the humidity set lower limit based on the humidity H in the storage room 25 detected by the humidity sensor 63, the microcomputer 61 sets the microcomputer. 61 judges that the dehumidification of the storage room 25 becomes unnecessary and humidification is necessary,
The humidifying heater 38 generates heat and is humidified by the humidifier 36. The humidity H increases due to the humidification, but the microcomputer 61 stops the compressor CP and the cooling fan 44 during the humidification. The dehumidifying fan 4
9, the discharge port 54 is also closed by the electric damper 56.

When the humidity H in the storage room 25 rises and reaches the humidity set upper limit at time t3 in FIG.
The microcomputer 61 determines that dehumidification in the storage room 25 is necessary, and first starts (ON) the compressor CP (motor CM) (shown by a broken line in FIG. 7). Thereafter, at time t4 when the predetermined delay period L1 has elapsed, the microcomputer 61 starts (ON) the cooling fan 43 (motor 43M) and circulates cool air in the cool air passage 46. In addition, the dehumidifying fan 49 (motor 49M) is activated, and the electric outlet 56 is driven by the electric damper 56 (motor 56M).
4 is opened, and the cool air in the cool air passage 46 is directly introduced into the storage room 25.

When the inside of the storage room 25 is dehumidified by the introduction of the cool air, and the humidity H decreases and reaches the humidity lower limit at time t5, the microcomputer 61 sets the compressor CP (motor CM) and the cooling fan 43 ( The motor 43M) is stopped (OFF), the dehumidifying fan 49 (motor 49M) is also stopped, and the discharge port 54 is closed by the electric damper 56 (motor 56M).

With the above control, the humidity in the storage room 25 is maintained at the humidity set value of 60%. However, when the dehumidification in the storage room 25 is unnecessary, the microcomputer 61 operates as described above. Since the CP and the cooling fan 44 are stopped, the cooling fan 44 is also stopped while the compressor CP is stopped, so that the heat exchange of the cooler 43 is reduced and its temperature rise is suppressed. Therefore, the dehumidifying ability at the initial stage of the subsequent dehumidification start can be secured, and the humidity rise in the storage room 25 as in the conventional case (continuous cooling fan operation) can be avoided.

In particular, when the operation of the compressor CP and the cooling fan 44 is started, the cooling fan 44 is started after a delay from the compressor CP. The temperature of the vessel 43 is first lowered, and then the cooling fan 44 is started, so that low-temperature and low-humidity cool air can be introduced into the storage room 25. Therefore, it is possible to effectively dehumidify the inside of the storage room 25 at the beginning of the dehumidification start, and it is possible to more effectively prevent the humidity inside the storage room 25 from rising.

Here, the microcomputer 61 corresponds to FIG.
In step S1, it is determined whether or not the humidity H in the storage room 25 is equal to or lower than the humidity setting lower limit. If the humidity H is higher than the humidity setting lower limit, the process proceeds to step S2 to determine whether the compressor CP is currently operating. to decide. Then, assuming that it is currently stopped, the microcomputer 61 proceeds to step S3, and determines whether or not the periodic humidity measurement has been completed.

Here, the microcomputer 61 executes the above-described periodic humidity measurement for constantly measuring the width of increase of the humidity H during a predetermined period, that is, the rate of change of the increase in the humidity H, and the periodic humidity measurement has been completed. In this case, the process proceeds from step S3 to step S4, and if the rate of change in temperature rise (rate of change) is greater than a predetermined value, the process proceeds to step S5 to set a compressor operation flag and start the compressor CP (motor CM). I do.

This situation will be described with reference to FIG. That is, the microcomputer 61 performs the periodic humidity measurement from the time t1 in FIG. 7 to the time t2 slightly exceeding the humidity set value, and the change rate of the humidity H increases from the humidity set lower limit value. If the humidity is too large, the humidity H becomes the upper limit of the humidity setting (setting
At time t2 before reaching the fixed value , the compressor CP (motor C
M) is activated (in this case, the delay period of the cooling fan 44 is L2).

As described above, the microcomputer 61 starts the compressor CP before the humidity H in the storage room 25 reaches the set humidity upper limit when the change rate of the humidity H is large while the compressor CP is stopped. When the humidity H suddenly increases, the operation of the compressor CP is started early and the dehumidification is started (the cooling fan 44 and the dehumidification fan 49 are activated, and the electric damper 56 is activated). The dehumidifying ability can be exhibited immediately with opening), whereby an abnormal increase in the humidity of the storage room 25 can be effectively prevented.

Further, the microcomputer 61 determines whether the temperature of the cooler 43 is higher or lower than a predetermined temperature T (° C.) based on the output of the cooler temperature sensor 64 in step S6 of FIG. If the temperature is high, the process proceeds to step S8, in which the temperature of the cooler 43 is lowered by operating the cooling fan 44 with the rotation speed thereof being reduced (down) by the inverter 66. When the temperature is low, the process proceeds to step S7, and the cooling fan 4
The temperature of the cooler 43 is increased by operating the rotation number 4 at a higher (up) speed (FIG. 8).

Here, the lower the temperature of the cooler 44, the greater the dehumidifying capacity. However, if the temperature is too low, the surroundings freeze and the dehumidifying capacity is rather reduced. That is, the cooler 44 has a temperature at which the dehumidifying capacity is maximized, and the temperature is set to the predetermined temperature T to control the rotation speed of the cooling fan 44, so that the dehumidifying capacity of the cooler 44 is maximized. It is possible to maintain the temperature at all times and effectively prevent the humidity in the storage room 25 from rising.

In the operation control of the compressor CP, the microcomputer 61 secures the minimum continuous stop time and the minimum continuous operation time necessary for the normal start of the compressor CP. Thereby, the overload of the compressor CP is eliminated, and the compressor CP and a relay (not shown) are protected.

[0044]

As described above in detail, according to the first aspect of the present invention, when dehumidification in the storage room is required, the compressor and the cooling fan are operated, and cool air is introduced into the storage room by the cool air introduction control means. At the same time, when dehumidification is not required, the compressor and the cooling fan are stopped, and the introduction of cool air by the cool air introduction control means is stopped. The heat exchange of the vessel is reduced and its temperature rise is suppressed. Therefore, the dehumidifying ability at the beginning of the next dehumidification start can be ensured, and a rise in the humidity in the storage room can be avoided.

In particular, according to the invention of claim 2, in addition to the above, when the operation of the compressor and the cooling fan is started, the cooling fan is started later than the compressor.
When the dehumidification of the storage room is started, the temperature of the cooler is first lowered, and then the cooling fan is started, so that the low-temperature and low-humidity cool air can be introduced into the storage room by the cool air introduction control means. Therefore, it is possible to effectively dehumidify the storage chamber at the beginning of the dehumidification start, and it is possible to more effectively prevent the humidity in the storage chamber from increasing.

According to the third aspect of the present invention, when the humidity in the storage room rises below a predetermined rate and reaches a set value , the compressor is operated, and cool air introduction control means introduces cool air into the storage room. together, the rate of increase in humidity during the stop of the compressor Tokoro to
If the rate of increase is higher than the specified rate, the humidity in the storage room is set.
Since the compressor is operated before reaching the value , if the humidity rises rapidly, start the compressor operation early and demonstrate the dehumidifying capacity immediately with the start of dehumidification. Therefore, an abnormal increase in the humidity of the storage room can be effectively prevented.

According to the fourth aspect of the present invention, the compressor is operated when dehumidification in the storage chamber is required, cool air is introduced into the storage chamber by the cool air introduction control means, and the temperature of the cooler is lower than a predetermined value. In this case, the rotation speed of the cooling fan is increased, and when the rotation speed is high, the rotation speed is decreased.Therefore, by setting the temperature at which the dehumidifying ability of the cooler is maximized to the predetermined value, When the temperature is low, the rotation speed of the cooling fan is increased to increase the temperature of the cooler, and when the temperature is high, the rotation speed is decreased to lower the temperature. As a result, the temperature of the cooler can be maintained at the above-mentioned predetermined value, and the maximum dehumidifying ability is always ensured, so that it is possible to effectively prevent an increase in humidity in the storage room.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a thermo-hygrostat of the present invention.

FIG. 2 is a side view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a block diagram of a control device of the thermo-hygrostat of the present invention.

FIG. 5 is a flowchart showing a program of a microcomputer.

FIG. 6 is a flowchart showing a program of the microcomputer.

FIG. 7 is a timing chart showing a change in humidity in a storage chamber of the thermo-hygrostat and the operation of the compressor and the cooling fan.

FIG. 8 is a diagram showing a state of controlling the number of rotations of a cooling fan.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Constant temperature / humidity apparatus 2 Heat insulation box 21 Inner box 22 Warm air passage 34 Fan for circulation in a cabinet 43 Cooler 44 Cooling fan 46 Cold air passage 61 Microcomputer 66 Inverter CP compressor

Continuation of front page (72) Inventor Masao Saito 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (56) References JP-A-6-141752 (JP, A) (58) Field (Int. Cl. ⁷ , DB name) A21C 13/00

Claims (4)

(57) [Claims] An inner box having good thermal conductivity provided in the heat insulating box, a cool air passage formed between the inner box and the heat insulating box, a storage chamber formed in the inner box, A cooler of a refrigerating device provided in the cool air passage; a cooling fan for circulating cool air having exchanged heat with the cooler into the cool air passage; and cool air controlling introduction of cool air from the cool air passage into the storage chamber. Introducing control means, a humidity sensor for detecting the humidity in the storage room, and a control device for controlling the cool air introduction control means, a cooling fan and a compressor of the refrigeration apparatus based on the output of the humidity sensor, The controller operates the compressor and the cooling fan when dehumidification in the storage chamber is required, and introduces cool air into the storage chamber by the cool air introduction control means. Compressor and cooling fan Stop, constant temperature and humidity apparatus characterized by stopping the introduction of the cold air by the cold air inlet control means. 2. When starting operation of the compressor and the cooling fan,
2. The constant temperature and humidity apparatus according to claim 1, wherein the cooling fan is started with a delay from the compressor. 3. A heat-conductive inner box provided in the heat-insulating box, a cool air passage formed between the inner box and the heat-insulating box, a storage room formed in the inner box, A cooler of a refrigerating device provided in the cool air passage; a cooling fan for circulating cool air having exchanged heat with the cooler into the cool air passage; and cool air controlling introduction of cool air from the cool air passage into the storage chamber. Introducing control means, a humidity sensor for detecting the humidity in the storage room, and a control device for controlling the cool air introduction control means, a cooling fan and a compressor of the refrigeration apparatus based on the output of the humidity sensor, This control device controls the humidity in the storage room to a predetermined rate or less.
When the compressor rises and reaches the set value , the compressor is operated,
While introducing cool air into the storage chamber by the cool air introduction control means, the rate of increase of the humidity during stoppage of the compressor is reduced.
The constant-temperature and constant-humidity device operates the compressor before reaching the set value when the rate of increase is greater than a predetermined rate of increase . 4. A heat conductive inner box provided in the heat insulating box, a cool air passage formed between the inner box and the heat insulating box, a storage room formed in the inner box, A cooler of a refrigerating device provided in the cool air passage; a cooling fan for circulating cool air having exchanged heat with the cooler into the cool air passage; and cool air controlling introduction of cool air from the cool air passage into the storage chamber. Introduction control means, a cooler temperature sensor for detecting the temperature of the cooler, a humidity sensor for detecting humidity in the storage chamber, and the cool air introduction control means, a cooling fan, and the refrigerating device based on outputs of both sensors. And a control device for controlling the compressor, the control device operates the compressor when dehumidification in the storage room is necessary, and introduces cool air into the storage room by the cool air introduction control means, The temperature of the cooler is predetermined If lower, the cooling fan increases the rotational speed of the constant temperature and humidity apparatus characterized by reducing the rotational speed is higher.