JP2003121072A - Dehumidifying and drying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dehumidifying and drying device reducing load to a compressor, elongating the life and suppressing the consumption of kinetic energy. SOLUTION: This dehumidifying and drying device is provided with heating means 3 heating a drying object stored in a box body 1, a cooler 7 disposed in the box body, driven by a refrigerating cycle, and condensing vapor in the box body inside, reheating means 13 heating the air in the box body cooled by the cooker, and a box inside blower 11 ventilating the air inside the box body from the cooler toward the reheating means. This device is attached with a natural circulation cooling device N having a natural circulation cooling cooler 15 disposed in the box body in the upstream side in the ventilation direction of the cooler, a natural circulation cooling condenser 14 disposed outside the box boy, and a natural circulation refrigerant pipe 16 connecting the natural circulation cooling cooler to the natural circulation cooling condenser.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
Alternatively, the present invention relates to a dehumidifying and drying device that can be preferably used for dehumidifying and drying foods and the like.

[0002]

2. Description of the Related Art FIGS. 3 to 5 are schematic configuration diagrams schematically showing a conventional dehumidifying / drying apparatus used for drying an object to be dried such as raw garbage. FIG. 3 is a first embodiment and FIG. 2 embodiment, FIG. 5 shows a third embodiment. First, in the first conventional mode shown in FIG. 3, the temperature of the material to be dried 2 in the box 1 is raised by the heating means 3 so that the moisture in the material to be dried 2 is transferred to the internal space of the box 1. Evaporate.

When the material to be dried 2 is, for example, raw garbage, the air temperature Ti above the material to be dried 2 is, for example, Ti = 40.
It is heated so as to be in a high temperature and high humidity condition of ℃ and relative humidity of 70% or more. In order to accelerate evaporation and drying of the material to be dried 2, it is necessary to discharge the high temperature and high humidity air to the outside of the box body 1. For example, the exhaust port 5 provided at the top of the box body 1 is used for exhaust. The high-temperature and high-humidity air inside the box 1 is discharged by the blower 6, and the ambient air is introduced from the intake port 4 provided on the side wall of the box 1 for drying.
In addition, To shows the outside air temperature outside the box 1, and Ti shows the air temperature inside the box 1.

However, in the conventional dehumidifying / drying apparatus of the first aspect as described above, the odor that evaporates along with the water is exhausted as it is, so the problem of odor diffusion occurs.

On the other hand, FIG. 4 shows a conventional dehumidifying / drying apparatus according to the second aspect. In the figure, 7 is a cooler arranged in the upper space of the sealed box body 1, and 8 is the box body 1. A condenser provided outside the compressor, 9 is a compressor, 10 is a refrigerant pipe which constitutes the refrigeration cycle by sequentially connecting the compressor 9, the condenser 8, the cooler 7, and the compressor 9, and 11 is An air blower inside the box that ventilates the air inside the box 1 in the direction of the arrow Y to the cooler 7, and a condenser blower 12 that vents the outside air to the condenser 12. It should be noted that a throttle device and the like provided in the refrigerant pipe connecting the condenser 8 and the cooler 7 are not shown. Further, the same or corresponding parts are denoted by the same reference numerals throughout the drawings, and the description thereof will be omitted.

In the conventional dehumidifying / drying apparatus having the above-described second aspect, the cooler 7 using the refrigeration cycle is arranged in the box body 1 which is a closed space, and the inside of the box body 1 is provided. By cooling and dehumidifying the evaporated water by the cooler 7, the water in the air containing odor is made into the form of drain water, and is discharged to the outside of the box body 1 by the discharging means (not shown).

FIG. 6 shows an example of fluctuations in the air condition at this time on a moist air diagram. In the figure, the point indicated by is the state of the inlet air of the cooler 7, and the air temperature Ti is about 40 ° C. and the relative humidity is about 70%. Indicates the state of the air cooled and dehumidified by the cooler 7, and
It is 0 ° C and about 45%. After all, the air inside the box 1
From this state, the air is blown into the box body 1 by the cooler 7 and is circulated in the box body 1 to dehumidify and cool the inside of the box body 1.

However, in the conventional method according to the second aspect, the temperature inside the box 1 is lowered as shown in the moist air diagram of FIG. 6, and the evaporation of water in the material to be dried 2 is hindered. Therefore, the required energy supplied to the heating means 3 to cover it becomes large.

On the other hand, in the conventional dehumidifying / drying apparatus shown in FIG. 5 which is the third mode, the condenser 8 in FIG. 4 is used as a reheating means and is provided on the downstream side of the cooler 7 in the box 1. The reheat condenser 13 is rearranged. In the conventional dehumidifying / drying apparatus according to the third aspect, a highly efficient dehumidifying apparatus is configured by raising the air temperature lowered by the cooler 7 by the reheating condenser 13 as the reheating means. You can

FIG. 7 is a wet air diagram showing an example of changes in the air condition in the conventional dehumidifying / drying apparatus according to the third aspect. The inlet air in the state where the air temperature Ti is about 40 ° C. and the relative humidity is about 70% is cooled and dehumidified by the cooler 7, and is about 30 ° C. and about 4 °
It is blown out from the cooler 7 in an air state of 5%. The air in that state is sucked into and heated by the reheating condenser 13 which is the reheating means, and is blown out from the reheating condenser 13 in the air state of about 42 ° C. and about 22% shown by. Therefore, the temperature inside the box 1 does not decrease.

As a conventional reference technology, for example, in Japanese Patent Laid-Open No. 11-135972, in an apparatus for cooling a heat-generating device housed in a housing by using an air conditioner, a boiling cooler is used as an auxiliary cooler to reduce running costs. Although the technology for suppressing the above is disclosed, it does not dehumidify and dry a dried material containing water such as raw dust as in the target technology of the present invention, and has different purposes and technical problems.

[0012]

In the conventional dehumidifying / drying apparatus, even in the dehumidifying apparatus having the improved efficiency as in the third aspect, high-temperature and high-humidity air is treated, so that a large amount of energy is consumed. However, there is a problem in that the life of the device becomes short due to the increase of the load on the compressor. The present invention has been made to solve the above-described problems of the prior art, and an object thereof is to provide a dehumidifying / drying device that reduces the load on the compressor, has a long life, and suppresses the consumption of operating energy. It is what

[0013]

A dehumidifying / drying apparatus according to the present invention includes a box for accommodating an article to be dried, a heating means attached to the box for heating the article to be dried, and arranged inside the box. A cooler that is installed and is operated by a refrigeration cycle to condense steam inside the box, reheat means for heating the air inside the box cooled by the cooler, and from the cooler to the reheat means In a dehumidifying / drying device equipped with a blower inside the box that ventilates air inside the box, a cooler for natural circulation cooling arranged in the box on the upstream side in the ventilation direction of the cooler, and outside the box. A natural circulation cooling device having a natural circulation cooling condenser provided and a natural circulation refrigerant pipe connecting the natural circulation cooling condenser and the natural circulation cooling condenser is additionally provided. .

As a reheating means, a condenser provided in the refrigeration cycle including a cooler is used as a reheating condenser.

Further, raw garbage is used as the material to be dried.

Foods are used as the material to be dried.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. 1 and 2 are views for explaining a dehumidifying / drying apparatus according to Embodiment 1 of the present invention. FIG. 1 is a schematic diagram showing the dehumidifying / drying apparatus, and FIG. 2 is a dehumidifying / drying operation in the apparatus of FIG. It is a moist air diagram explaining. In the figure, 1 is a practically airtight box body, 2 is an article to be dried such as garbage stored in the bottom of the box 1, 3 is heating means for heating the article 2 to be dried, Reference numeral 7 denotes a cooler provided in the upper space of the box body 1, 13 denotes a reheat condenser provided downstream of the cooler 7 in the ventilation direction indicated by an arrow Y, and 9 denotes the outside of the box body 1. The compressors 10 provided in the above are compressors 9 and reheat condenser 1
3 is a refrigerant pipe that sequentially connects the cooler 7, and the compressor 9.

A throttling device (not shown) is provided between the reheat condenser 13 and the cooler 7, and the circulation system sequentially connected by the refrigerant pipe 10 has, for example, R407.
A well-known refrigeration cycle is configured by enclosing a refrigerant such as A. For the sake of convenience, this refrigeration cycle will be referred to as a refrigeration cycle system P.

Reference numeral 14 is a condenser for natural circulation cooling provided on the roof outside the box 1, and 15 is arranged in series with the cooler 7 in the box 1 on the upstream side in the ventilation direction indicated by the arrow Y. It is a cooler for natural circulation cooling provided. Reference numeral 16 denotes a refrigerant outlet of the natural circulation cooling condenser 14 and a refrigerant inlet of the natural circulation cooling condenser 15, and a refrigerant inlet of the natural circulation cooling condenser 14 and a refrigerant outlet of the natural circulation cooling cooler 15. It is a refrigerant pipe for natural circulation that connects the respective parts and seals a refrigerant such as R407C inside to constitute the natural circulation cooling device N.

Further, 11 is arranged in the interior of the box body 1 in series after the natural circulation cooling cooler 15, the cooler 7 and the reheat condenser 13, and the box body 1 is provided. An in-box blower for ventilating the inside air in the direction indicated by arrow Y, and 17 is a blower for natural circulation cooling which is provided outside the box body 1 and ventilates outside air to the condenser 14 for natural circulation cooling. In addition, the natural circulation cooling cooler 1 provided in series as described above.
5, cooler 7, reheat condenser 13, and box blower 1
It is preferable to surround 1 with a duct (not shown) in order to enhance the effects of dehumidification and drying. In addition, the box blower 11
The arrangement position of may be any other position in the ventilation passage indicated by arrow Y.

Further, the box 1 is provided with an inlet / outlet for putting in / out the material to be dried 2 or an inlet for the material to be dried 2 and a discharge portion thereof, but these are not directly related to the invention. Therefore, the illustration is omitted. Further, as the control device, a well-known general device can be used without any special limitation, so that the illustration is omitted. Regarding other reference numerals, the same reference numerals are given to the same or corresponding portions as those of the conventional apparatus, and the description thereof will be omitted.

Next, the operation will be described. When the object to be dried 2 such as raw garbage is heated by the heating means 3, the water contained in or attached to the object to be dried 2 becomes water vapor and is discharged into the box body 1, and the air temperature in the box body 1 is increased. Both Ti and relative humidity increase. The cooling capacity of the natural circulation cooling device N depends on the temperature difference Ti-To inside and outside the box body. The smaller the temperature difference is, the lower the cooling capacity is. Therefore, the air temperature T inside the box body 1 is reduced.
When the i is operating at 40 ° C., for example, when the outside air temperature To is high, for example, when the temperature is higher than 32 ° C. in the summer, dehumidification / drying is mainly performed by the operation of the refrigeration cycle system P to cool the cooler. The water condensed in 7 is discharged as drain water to the outside of the box body 1 by a draining means (not shown). The discharged water is appropriately treated for environmental measures such as deodorizing treatment, and is discharged as sewage, for example.

On the other hand, when the outside air temperature To is lower than the air temperature Ti in the box body 1, for example, 20 ° C. or less, the temperature difference Ti-To inside and outside the box body becomes large, so that the natural circulation cooling cooler. The refrigerant evaporated in 15 is easily condensed in the natural circulation cooling condenser 14, and the natural circulation cooling cooler 15
Therefore, the refrigerant of the natural circulation cooling device N is naturally circulated without the need for power of a compressor or the like, and the air in the box body 1 blown by the box body blower 11 is the natural circulation cooling cooler 15 And then the refrigeration cycle system P
As a result, the temperature of the air sucked into the cooler 7 can be lowered.

Therefore, the operating rate of the compressor 9 is reduced by reducing the temperature to be cooled by the refrigeration cycle system P, and the overall operating cost is reduced by reducing the power consumption. You can In addition, the compressor 9
The reduction of the operating rate of 1 leads to the extension of the life of the compressor 9, and the effect that the useful life of the device can be increased is also obtained.

FIG. 2 shows fluctuations in the air condition when the natural circulation cooling device N is used in combination. The air inside the box 1 having a Ti of about 40 ° C. and a relative humidity of about 70% indicated by is shown in FIG.
5 is cooled and dehumidified by being ventilated, and is blown out from the natural circulation cooling cooler 15 in the air condition of about 34 ° C. and about 65% as shown by. The air in that state is sucked into the cooler 7 of the refrigeration cycle system P and further cooled,
Is blown out in the air state of about 30 ° C. and about 37% of the same, and is sucked into the reheat condenser 13 and heated. Then, it is blown out from the reheat condenser 13 in the air state of about 40 ° C. and about 22% of the same. Therefore, the air temperature in the box 1 does not drop.

In the conventional apparatus shown in FIG. 5, the operating energy of the compressor 8 is additionally required to cool the temperature decrease A shown in FIG. 2, but the temperature decrease shown by B is natural. Since it is covered by the circulation cooling device N, the compressor operating energy during this period is reduced. In addition, as the outside air temperature To decreases, the air temperature T in the box body 1 increases.
As the temperature difference between i and the outside air temperature To increases, the effect increases as the ratio of cooling by the natural circulation cooling device N increases in the beginning of spring and autumn, especially in winter.

As described above, according to the first embodiment, the load on the compressor 9 of the refrigeration cycle system P is reduced,
Accordingly, it is possible to provide a dehumidifying / drying device having a long service life and reduced operating cost. The operating temperature and relative humidity described above are merely examples for explaining the operation, and it is needless to say that the same effect can be obtained even when the operating temperature and humidity are appropriately changed as necessary or desired. Yes.

In the first embodiment, the heating function of the reheating means (condenser for reheating) 13 may be replaced with, for example, an electric heater or another heat source device such as steam or a hot water radiator. In particular, when heat energy can be obtained at low cost, the device including the heat energy supply to the heating means 3 for the material to be dried 2 can be configured as a whole to have a high energy efficiency.

Further, the refrigerant used in the natural circulation cooling device N is not limited to R407C, but may be water, for example.
Various refrigerants such as R22, R404A, and R410 can be used. The same effect can be expected even if the natural circulation cooling device N uses, for example, a heat pipe.

The material to be dried 2 is introduced into and discharged from the box body 1 in a batch system. For example, a fluidized bed is used, and the material to be dried 2 is placed on the fluidized bed and the inside of the box body 1 is continuously filled. It does not matter if you pass it. Further, the electric motor of the compressor 9 may be controlled by an inverter or the like, and when the outside air temperature decreases and the cooling load decreases, the operation may be performed so as to reduce the rotation speed of the electric motor according to the load.

Furthermore, in addition to the above inverter control device, a control device for controlling the temperature sensor for detecting the temperature inside and outside the box, the humidity sensor, the heating means 3, the in-box blower 11, and the natural circulation cooling blower 17, respectively. It is easy to add the above-mentioned components and the like, and to configure the microcomputer to integrally and efficiently control the entire operation according to the detection result of each sensor.

In the above description, the case of using the present invention for dehumidifying and drying raw garbage has been described, but the present invention is not limited to this and is preferably applied to various articles and materials that require drying with heating. be able to.
For example, it can be widely used for various foods such as scallops, cookies, etc., drying of food materials, drying of livestock feed, drying of dehydrated cakes such as pharmaceuticals, industrial products and industrial materials, and drying of sludge. Is.

[0033]

As described above, according to the present invention, it is possible to provide a dehumidifying / drying device that reduces the load on the compressor, has a long life, and suppresses the consumption of operating energy.

[Brief description of drawings]

FIG. 1 is a configuration diagram schematically showing a dehumidifying / drying device according to a first embodiment of the present invention.

2 is a moist air diagram for explaining the operation of dehumidifying and drying in the apparatus of FIG.

FIG. 3 is a schematic configuration diagram schematically showing a first aspect of a conventional dehumidifying and drying apparatus.

FIG. 4 is a schematic configuration diagram schematically showing a second aspect of a conventional dehumidifying / drying device.

FIG. 5 is a schematic configuration diagram schematically showing a third mode of a conventional dehumidifying and drying apparatus.

6 is a moist air diagram showing fluctuations in the air condition in the conventional apparatus of FIG.

7 is a moist air diagram showing fluctuations in the air condition in the conventional apparatus of FIG.

[Explanation of Codes] 1 box, 2 items to be dried, 3 heating means, 7 cooler, 9 compressor, 10 refrigerant pipe, 11 box blower, 13 reheating means (condenser for reheating), 14 natural circulation Cooling condenser, 15 Natural circulation cooling cooler,
16 Refrigerant piping for natural circulation, N natural circulation cooling device,
P refrigeration cycle system,

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3L113 AA01 AB02 AC01 AC22 AC52                       AC58 AC63 AC64 BA00 BA17                       DA02 DA06 DA18                 4B022 LB06 LR10 LT05                 4D004 AA03 AA04 CA22 CA32 CA42                       CB01 CB50

Claims (4)

[Claims] 1. A box for accommodating an article to be dried, a heating means attached to the box for heating the article to be dried, and an inside of the box which is disposed inside the box and operated by a refrigeration cycle. A cooler for condensing water vapor, a reheating means for heating the air inside the box cooled by the cooler, and an in-box blower for passing the air inside the box from the cooler toward the reheating means. In a dehumidifying / drying device equipped with, a cooler for natural circulation cooling arranged in the box on the upstream side in the ventilation direction of the cooler, and a condenser for natural circulation cooling arranged outside the box, and these. A dehumidifying / drying device further comprising a natural circulation cooling device having a natural circulation cooling cooler and a natural circulation refrigerant pipe connecting the natural circulation cooling condenser. 2. The dehumidifying / drying apparatus according to claim 1, wherein a condenser provided in a refrigeration cycle including a cooler is used as the reheating condenser as the reheating means. 3. The dehumidifying and drying apparatus according to claim 1 or 2, wherein raw garbage is used as the material to be dried. 4. The dehumidifying and drying apparatus according to claim 1 or 2, wherein foods are used as the material to be dried.