JP2000220866A - Low-temperature drying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly and fully dry an object to be dried in a low-temperature state by supplying dry air from a drying machine that is installed outside a device body to a cooling unit. SOLUTION: After a cart 36 accommodating an object to be dried is accommodated in an accommodation chamber Y of a prefabricated freezing refrigerator 20, a door 52 is closed, and a cooling unit 22 in the refrigerator and a cooling unit 23 outside the refrigerator, a dehumidification machine 24, and a supply fan 25 are operated. Then, the dehumidification machine 24 sucks one portion of air A in a third channel 33 via a suction duct 47 for drying and supplies the air A in the dry state to the cooling unit 22 in the refrigerator via a supply duct 48. The cooling unit 22 in the refrigerator takes in the air A in dry state from the dehumidification machine 24 and the air A from the third channel 33 for cooling, and supplies the cooling air A in dry state into a first channel 31. Then, the blowing fan 25 guides the cooling air A in dry state in the first channel 31 to a second channel 32 and supplies it into the accommodation chamber Y.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-temperature drying apparatus suitable for use in, for example, a prefabricated refrigeration apparatus.

[0002]

2. Description of the Related Art A conventional prefabricated refrigerator-freezer 1 shown in FIG.
0 is a box body 11 formed in a box shape by a heat insulating panel
Inside (hereinafter referred to as “inside”), the in-room cooling unit 12
External cooling units 13 are provided outside the main body 11, respectively. An evaporator 14 is provided in the in-compartment cooling unit 12, and a compressor (not shown)
A condenser and a decompression mechanism are arranged, and the compressor, the condenser, the decompression mechanism, and the evaporator 14 are connected in a ring shape by a refrigerant pipe 15.

In this prefabricated refrigerator 10, by driving the compressor of the cooling unit 13 outside the refrigerator and the blower fan 16, the evaporator 14 of the cooling unit 12 in the refrigerator cools the air inside the refrigerator and dries it. The fan 16 blows out the dried cooling air a into the refrigerator to dry the object to be dried (for example, a dried product like dried overnight) stored in the refrigerator via the cart 17 at a low temperature.

[0004]

However, in the conventional prefabricated refrigerator 10 as described above, drying of the object to be dried is performed by applying the cooling air a from the evaporator 14 to the object to be dried. In addition, it takes a long time to sufficiently dry the material to be dried.

[0005] In the conventional prefabricated refrigerator 10, the temperature and humidity in the refrigerator are not uniform, and the position of the cart 17 must be moved in order to dry the object to be dried uniformly.

Further, in the prefabricated refrigerator 10 described above,
Since frost adheres to the evaporator 14 during operation of the in-compartment cooling unit 12, the outside-compartment cooling unit 13
It is necessary to frequently carry out a defrost operation for eliminating the frost by supplying a high-temperature and high-pressure gas refrigerant from the gas turbine. However, during this defrost operation, the temperature inside the refrigerator increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a low-temperature drying apparatus which can dry an object to be dried in a low-temperature state in a short time and sufficiently.

[0008]

According to the first aspect of the present invention, a cooling unit is provided in an apparatus body provided with a heat insulating material, and the cooling unit cools and dries air in the apparatus body. The low-temperature drying apparatus is characterized in that dry air from a dryer installed outside the apparatus body can be supplied to the cooling unit.

According to a second aspect of the present invention, in the first aspect of the present invention, the cooling unit is installed at an upper portion in the apparatus main body, and an air intake portion of the cooling unit extends vertically. A plurality of rectifying members are arranged.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the operation of the cooling unit and the operation of the dryer can be performed independently. Is what you do.

[0011] The invention according to claim 4 is the invention according to claims 1 to 3.
In the invention described in any one of the above, the cooling unit is configured to be able to cool the air in the apparatus main body by evaporating a refrigerant or exchanging heat with brine.

[0012] The invention according to claim 5 provides the invention according to claims 1 to 4.
In the invention described in any one of the above, the dryer is configured to take in air in the apparatus main body, dry the air, and supply the air to the cooling unit.

The first aspect of the invention has the following operation.

Since the cooling unit can be supplied with dry air from a dryer installed outside the apparatus main body, the cooling unit can cool the dry air and supply it to the apparatus main body. The object to be dried stored in the apparatus main body can be dried sufficiently in a short time at a low temperature.

Further, since the cooling unit cools the dry air supplied from the dryer, a frost phenomenon occurring in the cooling unit is suppressed. Therefore, there is almost no need to perform the defrost operation of the cooling unit, and the cooling operation can be continuously performed in the apparatus main body for a long time.

The second aspect of the present invention has the following operation.

Since a plurality of rectifying members are arranged in the air intake portion of the cooling unit in the vertical direction, the dried cooling air flowing in the apparatus main body is uniformly distributed in the apparatus main body by the action of the rectifying member. Flows to For this reason, the object to be dried stored in the apparatus main body can be cooled uniformly and irrespective of the storage position, so that the object to be dried can be cooled and dried in a shorter time.

The third aspect of the invention has the following operation.

Since the operation of the cooling unit and the operation of the dryer can be performed independently, if the object to be dried requires more cooling than drying, the operation of the cooling unit is changed to the dryer. If the dry matter is required to be dried rather than cooled, the operation of the dryer can be performed more importantly than the operation of the cooling unit. Can be.

[0020] The invention described in claim 4 has the following operation.

Since the cooling unit is configured to be able to cool the air in the apparatus main body by evaporating the refrigerant or exchanging the brine, particularly when the air in the apparatus main body is cooled by using the brine, this cooling unit is used. Since the temperature change of the brine is small even by cooling, a stable cooling effect can be exhibited.

The fifth aspect of the invention has the following operation.

Since the dryer takes in the air in the apparatus main body, dries it, and supplies it to the cooling unit, the air in the apparatus main body can be more suitably dried.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

[A] First Embodiment (FIGS. 1 to 4) FIG. 1 is a perspective view showing an entire prefabricated refrigerator-freezer to which a first embodiment of a low-temperature drying apparatus according to the present invention is applied. It is. FIG. 2 is a sectional view showing the configuration of the prefabricated refrigerator-freezer of FIG.

The prefabricated refrigerator-freezer 20 as a low-temperature drying apparatus shown in FIGS. 1 and 2 has a box body 21 as an apparatus body formed of a heat-insulating panel in a box shape, and the inside of the box body 21 (hereinafter referred to as a box body). An internal cooling unit 22 as a cooling unit installed in the “inside X”), an external cooling unit 23 installed outside the main body 21, and a dehumidifier 24 also installed outside the main body 21. , And a plurality of rectifying plates 49 as rectifying members.

On the top surface 26 of the cabinet body 21, a top-side partition surface 27 that covers the entire lower surface of the top surface 26 and extends along the top surface 26 is arranged. A first flow path 31 through which air A flows is formed between the top surface portion 26 and the top-side partition surface 27. In addition, one side portion 2 of the cabinet main body 21
In FIG. 8, a one-side partition surface 29 that covers the entire inner surface of the one side surface portion 28 and extends along the top surface portion 26 is disposed. A second flow path 32 through which air A flows is formed between the one side surface 28 and the one side partition surface 29. Furthermore,
On the other side surface portion 30 facing the one side surface portion 28 of the refrigerator main body 21, another side surface side partition surface 34 that covers the entire inner surface of the other side surface portion 30 and extends along the other side surface portion 30 is arranged. A third flow path 33 through which the air A flows is formed between the other side surface 30 and the other side partition surface 34.

The top-side partition surface 27 and one side-side partition surface 2
9 and the other side partition surface 34 are constituted by heat insulating panels. Further, the storage room Y as a part of the interior X is constituted by being surrounded by the top-side partition surface 27, the one-side-side partition surface 29, the other-side-side partition surface 34, and the bottom portion 35 of the storage body 21. Is done. A cart 36 is stored in the storage room Y, and a material to be dried (for example, a dried product such as dried overnight) is placed and stored in the cart 36.

The internal cooling unit 22 includes an evaporator 3
7, an evaporator fan 38, an expansion valve 43, and a temperature sensing cylinder 44 (all shown in FIG. 3). The external cooling unit 23 includes a compressor 39, a condenser 40, a condenser fan 41, a dryer 42, and an accumulator 45 shown in FIG.

Compressor 39, condenser 40, dryer 42,
The expansion valve 43, the evaporator 37, and the accumulator 45 are connected in a ring shape using a refrigerant pipe 46, and the refrigeration cycle 5
0 is configured. By driving the compressor 39, the evaporator fan 38, and the condenser fan 41, the internal cooling unit 22 and the external cooling unit 23 are operated, and the evaporator 37 of the internal cooling unit 22 evaporates the refrigerant to generate the air A. To cool.

The temperature sensing tube 44 detects the temperature of the refrigerant at the outlet of the evaporator 37. The valve opening of the expansion valve 43 is adjusted based on the temperature detected by the temperature-sensitive cylinder 44.

As shown in FIG. 4, the compressor 39, the evaporator fan 38, and the condenser fan 41 are driven when the internal temperature is equal to or higher than the predetermined temperature t1, and the internal temperature is equal to or lower than the predetermined temperature t2. Stopped when These predetermined temperatures t1 and t2 are set to, for example, about + 0.5 ° C. and −0.5 ° C. with respect to the set temperature t0, respectively.

The dehumidifier 24 shown in FIG. 2 sucks the air A in the third flow path 33 by using a suction duct 47, and removes the water in the air A by a desiccant (not shown) such as silica gel.
And air is dehumidified and dried. The dehumidifier 24 supplies the dried air A to the upstream of the in-compartment cooling unit 22 in the first flow path 31 using the supply duct 48 and guides the dried air A to the in-compartment cooling unit 22.

As shown in FIG. 4, the dehumidifier 24 is operated when the humidity in the refrigerator becomes higher than the predetermined humidity h1, and is stopped when the humidity in the refrigerator becomes lower than h2. These predetermined humidities h1 and h2 are set to humidity values having a predetermined width with respect to the predetermined humidity h0. The operation of the dehumidifier 24 is performed independently of the operation of the internal cooling unit 22 and the external cooling unit 23 that constitute the refrigeration cycle 50.

A plurality of the blower fans 25 shown in FIG. 2 are arranged in one side portion 28 in the vertical direction.
By driving the blower fan 25 and the evaporator fan 38 of the in-compartment cooling unit 22, the dried air A cooled by the evaporator 37 of the in-compartment cooling unit 22 is dried in the first flow path 3.
1. The liquid is sequentially guided into the second flow path 32. Further, the blower fan 25 blows the air A in the second flow path 32 into the storage room Y.

The wind speed of the blower fan 25 is adjustable. Further, as shown in FIG. 4, the blower fan 25 is continuously driven to rotate while the prefabricated refrigerator 20 is operating (during a low-temperature drying operation).

The other side partition surface 34 shown in FIG. 2 functions as an air intake portion, and has an air intake opening 51 for taking in air A into the cooling unit 22 in the refrigerator. On the side wall surface of the third flow path 33 on the other side-side partition surface 34,
A plurality of rectifying plates 49 extending in the vertical direction of the
Is fixed. These rectifying plates 49 are provided so as to protrude into the third flow path 33 and serve as flow path resistance of the air A flowing through the third flow path 33. The flow straightening plate 49 is formed with a small amount of protrusion so that the flow passage resistance is reduced as the flow straightening plate 49 is disposed vertically downward. As a result, the air A sent into the storage chamber Y by the blower fan 25 flows uniformly in the storage chamber Y in the vertical direction, and flows from the air intake opening 51 to the third flow path 3.
3 flows into.

Next, the operation will be described.

After storing the cart 36 containing the material to be dried in the storage room Y of the prefabricated refrigerator 20, the door 52 (FIG. 1) is closed, and the in-compartment cooling unit 22, the outside-compartment cooling unit 23, and the dehumidifier 24 Then, the blower fan 25 is operated. Then, the dehumidifier 24 sucks and dries a part of the air A in the third flow path 33 through the suction duct 47 and sends the dried air A to the in-compartment cooling unit 22 through the supply duct 48. Supply.

The internal cooling unit 22 includes a dehumidifier 24
The air A in the dry state and the air A from the third flow path 33 are taken in and cooled, and the cooled air A in the dry state is supplied to the first flow path 3.
Feed into 1. Then, the blower fan 25 guides the dry cooling air A in the first flow path 31 to the second flow path 32,
It is fed into the storage room Y.

The cooling air A in a dry state introduced into the storage chamber Y flows uniformly in the vertical direction in the storage chamber Y by the action of the flow regulating plate 49, and during this time, the material to be dried in the cart 36 is kept in a low temperature state. Dry with.

The air A obtained by drying the material to be dried is supplied to the third flow path 33.
Into the dehumidifier 24 through the suction duct 47.
And then dried, and then cooled in the refrigerator 2
2 and the rest is guided directly to the in-compartment cooling unit 22 from the third flow path 33.

Therefore, according to the prefabricated refrigerator 20 of the above embodiment, the following effects are obtained.

Since the dry air A from the dehumidifier 24 installed outside the refrigerator main body 21 can be supplied to the refrigerator cooling unit 22, the refrigerator cooling unit 22 cools the dry air A. It can be supplied to the storage room Y of the storage X. Therefore, the object to be dried stored in the storage chamber Y can be sufficiently dried in a short time at a low temperature. For example, in one third of the conventional time (6 to 8 hours), 30
% High-quality overnight dried as a material to be dried can be obtained.

Since the in-compartment cooling unit 22 cools the dry air A supplied from the dehumidifier 24, the frost phenomenon occurring in the in-compartment cooling unit 22 is suppressed. Therefore, there is almost no need to perform the defrost operation of the in-compartment cooling unit 22, and the cooling operation in the storage room Y of the in-compartment X can be continuously performed for a long time.

Since a plurality of rectifying plates 49 are arranged in the vertical direction on the other side-side partition surface 34 in which the air intake opening 51 is formed, the rectifying plate 49 is dried and flows through the inside of the storage chamber Y of the inside X. The cooling air A is stored in the storage room Y
It flows evenly inside. Therefore, the object to be dried stored in the storage room Y can be uniformly cooled and dried uniformly regardless of the storage position, so that the object to be dried is Cooling and drying can be performed in a shorter time.

Since the operation of the in-compartment cooling unit 22 and the out-of-compartment cooling unit 23 and the operation of the dehumidifier 24 can be carried out independently, when the object to be dried requires more cooling than drying. Emphasizes the operation of the in-compartment cooling unit 22 and the out-of-compartment cooling unit 23 over the operation of the dehumidifier 24, and when the object to be dried is required to be dried rather than cooled, the operation of the dehumidifier 24 is Since the emphasis can be placed on the operation of the in-compartment cooling unit 22 and the out-of-compartment cooling unit 23, the usability of the prefabricated refrigerator-freezer 20 can be improved.

Since the dehumidifier 24 takes in the air A in the storage room Y in the storage X, dries it, and supplies it to the cooling unit 22 in the storage, the air A in the storage room Y can be dried in multiple stages. Drying of the air A in the storage room Y can be performed more suitably.

[B] Second Embodiment (FIGS. 5 and 6) FIG. 5 is a sectional view showing the configuration of a prefabricated refrigerator-freezer to which a second embodiment of a low-temperature drying apparatus according to the present invention is applied. It is. In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The prefabricated refrigerator 60 as a low-temperature drying apparatus according to the second embodiment includes a first passage 31
A cooling heat exchanger 62 for performing heat exchange with brine (antifreeze) is installed in the in-compartment cooling unit 61 installed in place of the evaporator 37 of the first embodiment, In addition, a brine cooling unit 63 is installed together with the external cooling unit 23 and the dehumidifier 24.
Further, a cooling fan 67 that functions in the same manner as the evaporator fan 38 is installed near the cooling heat exchanger 62 in the in-compartment cooling unit 61.

As shown in FIG. 6, the brine cooling unit 63 is provided with a transfer pump 66 and a brine cooler 6 through an annular brine pipe 64 provided with a cooling heat exchanger 62.
5 are sequentially provided, and are provided with an expansion valve 43 and a temperature-sensitive cylinder 44 provided in the refrigerant pipe 46. The brine cooler 65 cools the brine by evaporating the refrigerant flowing in the refrigerant pipe 46. The cooling heat exchanger 62 is supplied by the brine cooled by the brine cooler 65, the air A guided from the third flow path 33 of the inside X into the first flow path 31, and the dehumidifier 24. The air A in a dry state is exchanged with heat to cool the air A. Further, the transfer pump 66 circulates the brine between the brine cooler 65 and the cooling heat exchanger 62.

Therefore, in the prefabricated refrigerator-freezer 60, the cooling heat exchanger 62 of the in-compartment cooling unit 61 cools the air A in the first flow path 31 by heat exchange of the brine. Prefab refrigerator-freezer 2
In addition to the same effects as the effects 0 to, the following effects are also obtained.

Since the cooling heat exchanger 62 of the internal cooling unit 61 cools the air A in the internal X by heat exchange of the brine, the temperature change of the brine is small even by this cooling. Air A can be cooled stably.

Although the present invention has been described based on the above embodiment, the present invention is not limited to this.

[0055]

As described above, according to the low-temperature drying apparatus according to the present invention, the cooling unit installed in the apparatus main body having the heat insulating material cools and dries the air in the apparatus main body, Since the drying air from the dryer installed outside the apparatus main body is configured to be supplied to the cooling unit, it is possible to dry the object to be dried in a low temperature state in a short time and sufficiently.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an entire prefabricated refrigerator to which a first embodiment of a low-temperature drying apparatus according to the present invention is applied.

FIG. 2 is a sectional view showing a configuration of the prefabricated refrigerator-freezer of FIG.

FIG. 3 is a circuit diagram showing a refrigeration cycle of the prefabricated refrigerator of FIG. 2;

FIG. 4 is a time flowchart showing the operation of the prefabricated refrigerator-freezer of FIG. 2;

FIG. 5 is a sectional view showing a configuration of a prefabricated refrigerator-freezer to which a second embodiment of a low-temperature drying apparatus according to the present invention is applied.

FIG. 6 is a circuit diagram showing a refrigeration cycle of the prefabricated refrigerator of FIG. 5;

FIG. 7 is a cross-sectional view showing a configuration of a conventional prefabricated refrigerator-freezer.

[Explanation of symbols]

 Reference Signs List 20 Prefabricated refrigerator-freezer (low-temperature drying device) 21 Storage main unit (device main unit) 22 Internal cooling unit (cooling unit) 30 Other side part (air intake unit) 36 Cart 37 Evaporator 47 Suction duct 48 Supply duct 49 Straightening plate ( Rectifying member) 51 Air intake opening 60 Prefabricated refrigerator-freezer (low-temperature drying device) 61 Cooling unit in the refrigerator (cooling unit) 62 Heat exchanger for cooling 63 Brine cooling unit X Inside the refrigerator Y Storage room

Claims (5)

[Claims] 1. A low-temperature drying apparatus for cooling and drying air in the apparatus main body, wherein the cooling unit is installed in the apparatus main body including a heat insulating material. A low-temperature drying apparatus characterized in that it is configured to be able to supply dry air from a dryer installed in the apparatus. 2. The cooling unit according to claim 1, wherein the cooling unit is installed in an upper portion of the apparatus main body, and a plurality of rectifying members are arranged in a vertical direction in an air intake portion of the cooling unit. A low-temperature drying device according to item 1. 3. The low-temperature drying apparatus according to claim 1, wherein the operation of the cooling unit and the operation of the dryer are independently performed. 4. The low-temperature drying apparatus according to claim 1, wherein the cooling unit is configured to be able to cool the air in the apparatus main body by evaporating a refrigerant or exchanging heat with brine. apparatus. 5. The low-temperature dryer according to claim 1, wherein the dryer is configured to take in air in the apparatus main body, dry the air, and supply the air to a cooling unit.