JP2840514B2 - Cold storage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-temperature refrigerator for cooling a storage room by indirect cooling.

[0002]

2. Description of the Related Art Conventionally, a refrigerator box has a double structure consisting of an outer box having heat insulation and an inner box having good heat conductivity, and a cooling device is disposed between the inner and outer boxes so that the inside of the inner box is formed. Cooling the storage room,
As a so-called indirect cooling type low-temperature storage, there is, for example, Japanese Patent Application No. 2-60402 filed by the applicant.

[0003] The configuration shown therein is a cool air circulation space formed between an insulated outer box and a heat conductive inner box. A cooling device is arranged above the inner box and cooled by a plurality of blowers. The cool air cooled by the container is supplied to the space above the top wall of the inner box and cooled, then flows to the space outside the right side wall of the inner box, and circulates to the space below the bottom wall and outside the left side wall. I have to.

According to such a configuration, since the storage room is indirectly cooled from the peripheral wall surface of the inner box, the water evaporating from the vegetables and fruits stored in the storage room is retained without escaping to the outside. It is possible to keep the humidity of the room high. Thereby, there is an effect that quality deterioration due to drying of the food is suppressed, and good long-term storage can be achieved.

[0005] However, there is a problem that the humidity in the storage room tends to increase particularly in summer, and depending on the type of food, excessively high humidity rather causes rot, which is not preferable for long-term storage. Therefore, for example, in Japanese Unexamined Patent Publication No. 4-155171 (F25D23 / 00), a through hole is formed in the inner box wall surface, a small air blower is provided in the through hole, and the humidity sensor for detecting the humidity in the storage room is used. By operating the small air blower and introducing the cool air in the dry low humidity cool air circulation space into the storage room,
The storage room humidity was configured to be controlled to a predetermined value.

In addition, in such a low-temperature refrigerator of the indirect cooling type, the cooling capacity in the storage room is inevitably lower than in a system in which cool air is directly circulated into the storage room to cool the storage room. Therefore, there is a problem that the cooling rate after turning on the power becomes slow, and the time until the temperature reaches the set temperature for storing the food becomes long. Therefore, for example, Japanese Patent Application Laid-Open No. 4-184070 (F25D2
3/00), a through hole was formed in the inner box wall surface as described above,
A small air blower is provided in the through hole, and the small air blower is operated by a temperature sensor that detects the temperature in the storage room, and low-temperature cold air in the cool air circulation space is introduced into the storage room, so that the storage room is quickly cooled. It was configured to cool.

[0007]

However, in the prior art, since the cold air in the cold air circulation space was simply introduced into the storage room as described in the above publications, especially in an environment where the outside air temperature is high and the humidity is high such as in summer, When the door is opened and closed, the water vapor in the outside air that has entered the storage chamber becomes saturated, and the water condenses on the lower surface of the top wall of the inner box and condenses violently. Such dew condensation eventually falls as water droplets and falls on foods in the storage room below, and there is a problem that those foods are stained and deteriorate in quality.

The present invention has been made to solve the above-mentioned conventional technical problem, and it is an object of the present invention to provide an indirect cooling type low-temperature refrigerator in which dew condensation on the lower surface of the inner box top wall is favorably suppressed or eliminated. Aim.

[0009]

According to the first aspect of the present invention, a low-temperature refrigerator (1) is provided with a heat-insulating outer box (2) and a space inside the outer box (2). An inner box 3 having good thermal conductivity to be formed, a cool air circulation space 11 formed between the outer box 2 and the inner box 3, a cooler 12 and blowers 13, 19 disposed in the cool air circulation space 11. And a cool air introducing means (small blower 23) for introducing cool air in the cool air circulation space 11 into the storage room 10, and a cool air introduced by the cool air introducer (small blower 23). Rectifying means (rectifying device 2)
4) is provided.

The low-temperature storage 1 according to the second aspect of the present invention is provided with a heat-insulating outer box 2 and a thermal storage device which is disposed inside the outer box 2 with a space therebetween and forms a storage room 10 therein. A conductive inner box 3,
A cool air circulation space 11 formed between the outer box 2 and the inner box 3;
An inlet 21 formed in the inner box 3 and provided with the cooler 12 and the blowers 13 and 19 disposed in the cool air circulation space 11 and communicating the storage room 10 with the cool air circulation space 11. And a blower 2 for introducing cool air in the cool air circulation space 11 into the storage room 10 from the outlet 21 and the inlet 21.
3 and the cool air introduced by the blower 23
A rectifying device 24 for directing the cooling air in the direction of the top wall 3 </ b> A.
1 and a partition 26B for separating the inlet 21 and the outlet 22 from each other.

[0011]

According to the first aspect of the present invention, cold air is introduced into the storage room by the cool air introduction means (small air blower) to dehumidify the interior of the storage room and adjust the humidity. And the cooling capacity can be increased. Further, the introduced low-temperature and low-humidity cool air is directed toward the top wall 3A of the inner box 3 by the rectifying means (rectifying device 24). Will be distributed on a regular basis. Therefore, the water vapor on the lower surface of the top wall 3A of the inner box 3 hardly saturates, and
Adhesion of dew on the lower surface of A can be suppressed or eliminated.

According to the low-temperature storage 1 of the second aspect of the present invention, in addition to the above, the duct 26A of the rectifier 24 guides the circulating air in the cool air circulation space 11 to the inlet 2 and the inlet 21. The partition 26B of the rectifier 24 separates the air from the storage room 10 into the cool air circulation space 11 by the partitioning portion 26B. Introduction can be achieved.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. A low-temperature refrigerator 1 such as a prefabricated refrigerator includes a heat-conductive inner box 3 made of metal or the like stored and arranged inside a heat-insulating outer box 2 at intervals. A closed storage room 10 is formed, and a storage room 1 is provided between the inner box 3 and the outer box 2.
A series of cool air circulation spaces 11 located around 0 are formed. The outer box 2 is formed in a box shape by combining heat insulating panels, and the inner box 3 is formed by a top wall 3A, a bottom wall 3B, and front, rear, left and right side walls 3C, 3D, 3E, and 3F.

At the center of the front wall of the outer box 2 is an article entrance 7 for taking in and out of stored food (in the embodiment, agricultural products such as vegetables, fruits, and fresh flowers), and the article entrance 7 is openably and closably closed. A heat-insulating door 8 that seals 10 is provided.

The cool air circulation space 11 includes an upper space 11A above the top wall 3A, a bottom space 11B below the bottom wall 3B, and a front space 11C outside the front wall 3C. A rear space 11D, which is a space outside the rear wall 3D, and a left space 1, which is a space outside the left wall 3E.
1E and a right space 11F which is a space outside the right wall 3F.
It is composed of

A cooling device 14 is mounted on the upper and lower surfaces of the outer box 2 at the right end thereof toward the top wall 2A. The portion of the cooling device 14 on the lower surface side of the top wall 2A is located in the upper space 11A of the cool air circulation space 11, and includes a cooler 12 constituting a part of a refrigeration cycle, a blower fan and a blower fan motor. And a first blower 13. Further, a compressor 16 constituting the refrigeration cycle is provided on a portion on the upper surface side of the ceiling wall 2A. These first
The blower 13 and the compressor 16 are intermittently operated by a thermostat (not shown) that detects the temperature of the circulating cool air in the cool air circulation space 11 that the cooling device 14 has.

The intermittent operation is stopped when the temperature detected by the thermostat becomes lower than the lower limit temperature.
This means operation control such that operation is performed when the temperature becomes equal to or higher than the upper limit temperature. The setting of the upper and lower limit temperatures of the thermostat is performed based on the setting of the temperature in the storage room 10.

At the left end of the cool air circulation space 11 in the upper space 11A, a second air blower 19 which is always operated is provided.
Are arranged. When the first blower 13 is operated, cool air that has exchanged heat with the cooler 12 is blown into the upper space 11A as indicated by an arrow in FIG. The cool air in the cool air circulation space 11 is moved from the left space 11E indicated by an arrow in FIG.
1B, flows into the front space 11C and the rear space 11D, rises in the right space 11F, passes through the cooling device 14, and is forcedly circulated to return to the upper space 11A. Therefore, the left space 11E serves as a high pressure area in the cool air circulation space 11, and the right space 11F and the upper space 11A serve as a low pressure area in the cool air circulation space 11.

The right side wall 3F of the inner box 3 facing the low pressure area.
A rectangular inlet 21 as shown in FIG. 4 is formed in the upper part, and slit-like outlets 22, 22 are provided on the left and right sides.
Are drilled respectively. The inlet 21 and the outlet 22 communicate the inside of the storage room 10 with the right space 11F of the cool air circulation space 11, and the right wall 3F of the inlet 21 and the outlet 22 is provided with a cool air introducing means. And a rectifying device 24 as rectifying means.

The rectifying device 24 includes a partition plate 26 inserted into the inlet 21, a mounting plate 27 of the small blower 23, and a rectifying plate that covers the inlet 21 and the outlet 22 on the storage room 10 side. 28. The partition plate 26 is composed of a substantially horizontal duct portion 26A, and partition portions 26B, 26B hanging downward from the left and right thereof. The partition plate 26 is inserted into the introduction port 21 from the storage room 10 side and held almost exactly, and thereafter, The end contacts the inner surface of the right side wall 2B of the outer box 2 as shown in FIG. In this state, the duct portion 26A extends between the inner box 3 and the outer box 2 at the upper edge of the inlet 21 and the partition portion 26B,
26B is the outer box 2 to the inner box 3 at the left and right edges of the inlet 21.
And further project through the inner box 3 to the front of the inlet 21. Further, the front edges of the partitioning portions 26B, 26B are inclined such that the upper part is separated from the right side wall 3F and the lower part is close to the right side wall 3F.

The small air blower 23 is inserted into a rectangular recess 27A of a mounting plate 27 having a circular grill and fixed with screws. An upper flange 27B extending upward is formed on an upper edge of the mounting plate 27, and a receiving flange which extends downward and then bends forward and further upward is bent on the lower edge. 27C are formed. And
The concave portion 27A is inserted into the inside of the partition plate 26, the upper flange 27B is screwed to the upper right wall 3F above the inlet 21 and the base of the receiving flange 27C is connected to the lower right wall 3F below the inlet 21. To fix the mounting plate 27.

The rectifying plate 28 has a horizontal upper surface 28A and an upper surface 28B whose upper portion is separated from the right side wall 3F and whose lower portion is inclined so as to be close to the right side wall 3F. 31 is cut out, and a slit-shaped suction port 32 is formed in the left and right portions of the front surface 28B. A fitting flange 28C that is bent upward and then bent forward is formed at the rear edge of the upper surface 28A.

The rectifying plate 28 has the lower edge of the front surface 28B placed and engaged on the receiving flange 27C of the mounting plate 27, and the fitting flange 28C is bent forward at the upper edge of the right side wall 3F. It is attached by fitting into the flange 33. At this time, the central portion of the front surface 28B of the rectifying plate 28 is opposed to the front of the small air blower 23 in such a manner that the upper portion thereof is inclined so as to be separated from each other, and the suction ports 32, 32 are connected to the discharge port 22,
22 facing forward. Further, the partition 2 of the partition plate 26
The leading edges of 6B, 26B abut against the inner surface of the front surface 28B inside each of the suction ports 32, 32, thereby partitioning the central portion of the front face 28B from the suction ports 32,32. In addition, the upper edge flange 33 is fixed to the top wall 3 </ b> A by the fixture 34.

As described above, the rectifying plate 28 of the rectifying device 24 is mounted by placing the front surface 28B on the receiving flange 27C of the mounting plate 27 and fitting the fitting flange 28C into the upper edge flange 33. As a result, the small blower 23 can be easily removed even when it is out of order, and the maintenance workability is also improved. Further, since the partition plate 26 is also inserted and attached to the introduction port 21, the workability in assembling is further improved.

Further, an electric heater 36 for heating the circulating cool air is provided in the upper space 11A. Also,
A humistat 37 for detecting the humidity in the storage room 10 and controlling the operation of the small air blower 23 is attached to the front wall of the outer box 2, and the front wall also detects the outside air temperature and An outside temperature thermostat 38 for controlling the energization of the heater 36 is attached.

The operation of the low-temperature storage 1 with the above configuration will be described with reference to the timing chart of FIG. First, assuming that food such as agricultural products is stored in the uncooled storage room 10 and the set temperature of the storage room 10 is set to a refrigeration temperature zone such as + 2 ° C., for example, the thermostat provided in the cooling device 14 The upper limit temperature in the cool air circulation space 11 is, for example, 0 ° C., and the lower limit temperature is, for example, −2 ° C. When the cooling device 14 is operated in this state, since the temperature in the cool air circulation space 11 is higher than the upper limit temperature, the cooling device 14 (the compressor 16 and the first blowing device 13) is operated by the thermostat. Then, the cool air cooled by the cooler 12 is discharged to the upper space 11A. Further, the second blower 19 is operated continuously, and the cool air circulation as indicated by an arrow in FIG. 1 is formed in the cool air circulation space 11. As a result, the walls 3A to 3F of the inner box 3 are cooled, and the inside of the storage room 10 is uniformly and indirectly cooled from the surroundings by the radiant heat from each wall.

When the outside air temperature of the low-temperature storage 1 becomes lower than a predetermined low temperature TS, the outside air temperature thermostat 38 energizes the electric heater 36. Here, in a low outside air temperature state such as in winter, the temperature in the cool air circulation space 11 also becomes low, so that the operation rate of the cooling device 14 decreases. Therefore, the storage room 10
Although the internal cooling capacity and the dehumidifying capacity to be described later are also reduced, the outside air temperature thermostat 38 causes the electric heater 36 to generate heat when the outside air temperature is low, so that the operation rate of the cooling device 14 is increased, and the occurrence of such inconveniences is thereby reduced. Is prevented.

Next, the operation / stop control of the small blower 23 will be described. When the set humidity HS in the storage room 10 is set to, for example, 80% in the humistat 37, the upper limit humidity HH is 85% and the lower limit humidity HL is 75%. The set humidity HS is set to an optimum storage humidity according to the type of food to be stored.

The evaporation of the water from the food causes the storage room 10
When the inside humidity rises to reach the upper limit humidity HH, the humistat 37 operates the small air blower 23. When the small blower 23 is operated, cool air is sucked from the cool air circulation space 11 and is discharged toward the storage room 10. At this time,
The duct portion 26A of the partition plate 26 extends from the upper edge of the inlet 21 to the right space 11F side, and the partition portions 26B and 26B extend downward on both sides thereof. As shown by arrows in FIG. Since it rises from below the right space 11F, a part of the rising cool air is smoothly distributed by the duct portion 26A.
It is led to.

The low-temperature, low-humidity dry and cool air discharged from the small blower 23 collides with the front surface 28B of the current plate 28 through the partitions 26B, 26B, and is directed obliquely upward along the slope. . Then, the air is blown upward and obliquely forward from the discharge port 31, and is discharged into the storage room 10 along the lower surface of the top wall 3 </ b> A of the inner box 3. The supply of the low-temperature, low-humidity cool air dehumidifies the inside of the storage room 10, and the humidity decreases.

The opening and closing of the door 8 causes the storage room 10 to open and close.
When the outside air having a high humidity enters the inside, especially in summertime or the like, the water vapor in the outside air enters a saturated state, and tends to condense violently on the lower surface of the ceiling wall 3A. However, according to the present invention, the dry cool air from the small blower 23 is directed toward the top wall 3A of the inner box 3 by the rectifying plate 28, is discharged from the discharge port 31, and flows forcibly through the lower surface of the top wall 3A. The dew condensation on the lower surface of the ceiling wall 3A is eliminated or suppressed.

Accordingly, it is possible to prevent the food from being contaminated by dripping of dew condensation on the lower surface of the top wall 3A. Moreover, since the cool air is supplied to the upper part of the storage room 10 by such a structure, the upper part of the storage room 10 where the temperature tends to increase can be favorably cooled, and uniform cooling in the storage room 10 is achieved. In the vicinity of the center or lower part of the storage room 10 where the food is present, a breeze of, for example, about 0.2 m / s is generated, so that local drying of the food is also prevented.

On the other hand, since the inside of the storage room 10 becomes high pressure by the introduction of the cool air, the cool air in the storage room 10 is supplied to the suction port 32,
32 or the side surface of the current plate 28 flows into the outlets 22, 22, and is discharged into the right space 11F. This makes it easier for the small blower 23 to introduce cool air. In this case, the discharge ports 22 and 22 and the inlet 21 and the discharge port 31 and the suction ports 32 and 32 are connected to the partition 26 of the partition 26 as described above.
B, 26B, the short cycle of cold air between the inlet 21 and the outlets 22, 22 is prevented. Therefore, the storage room 10 by the small blowing device 23
The cold air can be introduced very efficiently and smoothly.

The humidity in the storage room 10 is reduced by the introduction of the dry cool air, and when the temperature reaches the lower limit temperature HL, the small air blower 23 is operated by the humistat 37.
Is stopped, thereby stopping the introduction of cold air. With the above control, the humidity in the storage room 10 is maintained at the set humidity HS as an average.

In the embodiment, the humistat 37 is used.
The small blower 2 based on the humidity in the storage room 10
3 is controlled, but not limited thereto, a thermostat for detecting the temperature in the storage room 10 is provided, and the small blower 23 is controlled based on the temperature in the storage room 10 to improve the cooling rate in the storage room 10. May be. Further, in the embodiment, the cool air is introduced by the small blower 23, but the cool air introducing means may be constituted by an opening / closing plate such as a damper.

[0036]

As described above in detail, according to the first aspect of the present invention, cold air is introduced into the storage chamber by the cool air introduction means to dehumidify the storage chamber and adjust the humidity, or the cooling capacity of the storage chamber. Can be increased. The introduced low-temperature and low-humidity dry cold air is directed toward the top wall of the inner box by the rectifying means and is forcibly circulated to the lower surface of the top wall of the inner box. This makes it difficult to suppress or eliminate the adhesion of dew on the lower surface of the ceiling wall. Therefore, it is possible to prevent damage to the stored articles due to the drop of water drops from the ceiling wall.

According to the second aspect of the present invention, in addition to the above, the duct portion of the rectifier guides the circulating air in the cool air circulation space to the inlet, and transfers the air in the cool air circulation space to the inlet. Since the partition of the rectifying device separates the discharge port from the discharge port, a short cycle between the ports does not occur, and efficient cold air introduction can be achieved.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a low-temperature storage of the present invention.

FIG. 2 is a vertical sectional side view of the low-temperature storage of the present invention.

FIG. 3 is an enlarged vertical sectional front view of an inlet portion of the low-temperature storage of the present invention.

FIG. 4 is an exploded perspective view of the small blower and the rectifier.

FIG. 5 is a timing chart showing a change in humidity in a storage room and an operation state of each device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Low-temperature storage 2 Outer box 3 Inner box 3A Top wall 10 Storage room 11 Cold air circulation space 12 Cooler 13 First blower 14 Cooler 19 Second blower 21 Inlet 22 Outlet 23 Small blower 24 Rectifier 26 Partition plate 26A Duct part 26B Partition part 28 Rectifier plate 31 Discharge port

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F25D 17/08 F25D 21/04

Claims (2)

(57) [Claims] 1. A heat-insulating outer box, a heat-conductive inner box disposed inside the outer box with a space therebetween to form a storage room therein, and the outer box and the inner box. A cold air circulation space formed between the cold air circulation space and a cooler and a blower disposed in the cold air circulation space, and introducing cold air in the cold air circulation space into the storage chamber. And a rectifying means for directing the cool air introduced by the cool air introducing means toward the top wall of the inner box. 2. A heat-insulating outer box, a heat-conductive inner box disposed inside the outer box with a space therebetween to form a storage room therein, and the outer box and the inner box. A cold air circulation space formed between the cold air circulation space and a cooler and a blower disposed in the cold air circulation space, and formed in the inner box, the storage room and the cold air circulation space. An inlet and an outlet that communicate with each other, a blower that introduces cool air in the cool air circulation space from the inlet into the storage chamber, and directs the cool air introduced by the blower toward the top wall of the inner box. A rectifying device, wherein the rectifying device includes a duct for guiding the circulating cool air in the cool air circulation space to the inlet, and a partition for separating the inlet from the outlet. Warehouse.