JP2532992B2 - Cold storage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a low-temperature chamber for cooling a storage chamber by indirect cooling.

(B) Conventional technology Conventionally, a refrigerator box has a double structure consisting of a heat-insulating outer box and a heat-conducting inner box, and a cooling device is arranged between the inner and outer boxes to provide the inner box and the inside thereof. As an indirect cooling type low temperature chamber for cooling, the applicant previously filed Japanese Patent Application No. 2-6040.
There is No. 2.

In the configuration shown therein, the cooling device 12 is arranged above the inner box 3 in the cool air circulation space 11 between the heat-insulating outer box 2 and the inner box 3, and the first and second blowers 13 and 19 are provided. By cooler 12
After the cold air cooled in step 3 is supplied to the upper space 11A above the top wall 3A of the inner box 3 to cool it, the right space 11F outside the right wall 3F
I am trying to flush it.

(C) Problems to be Solved by the Invention According to the configuration of the invention, since the storage chamber 10 is indirectly cooled from the peripheral wall surface of the inner box 3, the moisture evaporated from the vegetables and fruits stored in the storage chamber 10 is evaporated. Is retained without escaping to the outside, so that the humidity in the storage chamber 10 can be kept high.

Thereby, it is possible to suppress the deterioration of quality of the living food due to drying and achieve long-term storage, but depending on the type of food, excessive humidity rather causes spoilage, which is an undesirable problem.

Therefore, an object of the present invention is to provide a low-temperature warehouse that can control humidity in the storage room in a low-temperature warehouse that indirectly cools the storage room and can achieve humidity management according to the type of parts in the storage room. To do.

(D) Means for Solving the Problem The present invention is a heat-insulating outer box, a heat-conducting inner box that is arranged inside the outer box with a space, and forms a storage chamber therein,
In a low-temperature chamber comprising a cold air circulation space formed between the outer box and the inner box, a cooling device arranged in the cold air circulation space and an air blower for forcedly circulating the cold air therein, the cold air circulation space is Provided in the cold air circulation space is a partition member that divides into a high pressure area on the cool air discharge side of the air blower where the cooler is arranged and a low pressure area on the cold air suction side of the air blower,
And the cold air introduction means for introducing the cold air in the low pressure area into the storage chamber is provided in the inner box located in the low pressure area, and the cold air is introduced so as to maintain the storage room at the set humidity based on the humidity in the storage room. It is intended to control the means.

Further, a heater is arranged on the downstream side of the cold air introducing means in the low pressure area.

(E) Operation According to the present invention, the cold air introduction means introduces the dry cold air in the cold air circulation space into the storage chamber according to the humidity in the storage chamber to appropriately reduce the humidity in the storage chamber and maintain the set humidity. .
Further, the cool air introduction means is provided in the inner box located in the low pressure area of the cold air circulation space, the cool air blown out from the cooler flows through the high pressure area, and cools the storage chamber through the inner box located in the high pressure area. After the temperature rises, the cold air flows into the low-pressure area, and a part of the cold air whose temperature has risen via the high-pressure area is introduced into the storage chamber by the cold-air introducing means, so that a large fluctuation in the temperature inside the storage chamber is avoided.

Furthermore, by heating the cold air with the heater provided on the downstream side of the cold air introducing means in the low pressure area, it is possible to prevent the heated cold air from flowing into the storage chamber from the cold air introducing means,
Further, the cooling operation rate by the cooler in the high-pressure area is improved, the cold air in the cold air circulation space can always be maintained in a dry state, and the humidity in the storage chamber can be smoothly lowered by introducing the cold air.

(F) Example An example of the present invention will be described below with reference to the drawings.

Reference numeral 1 is a low-temperature refrigerator such as a prefabricated refrigerator, and by storing and arranging an inner box 3 made of a good thermal conductor such as metal at a space inside the heat-insulating outer box 2, a sealed storage is provided inside the inner box 3. A cold air circulation space 11 is formed in the chamber 10 and the periphery of the storage chamber 10, that is, a space portion surrounded by the inner box 3 and the outer box 2. The outer box 2 is formed in a box shape by combining a heat insulating panel having a convex portion or a concave portion at a connecting portion with an adjacent panel, and the inner box 3 has a top wall 3A, a low wall 3B and front, rear, left and right side walls 3 respectively.
It is composed of C, 3D and 3F.

On the left side of the front wall of the heat-insulating outer box 2, a component entrance / exit 7 for putting in and out stored food (in this example, agricultural products such as vegetables and fruits) and the part entrance / exit 7 are openably and closably closed, and the storage compartment 10 is closed. A heat insulating door 8 is provided.

On the lower surface of the right end portion facing the top wall 2A of the outer box 2, a cooling device 14 inside the refrigerator is installed in the cold air circulation space 11. The cooling device 14 is composed of a cooler 12 represented by an evaporator forming a part of a refrigeration cycle, a blower fan and a blower fan motor, and is intermittently provided by a temperature sensor S1 that detects the temperature in the storage chamber 10. It has a built-in first blower device 13 to be operated.

It should be noted that the intermittent operation means operation control such that the temperature sensor S1 stops when the temperature detected by the temperature sensor S1 becomes lower than or equal to the lower limit temperature, and enters an operating state when the temperature becomes equal to or higher than the upper limit temperature.

Reference numeral 16 is a partition plate that partitions an upper space 11A, which will be described later, into a high-pressure area 20 and a low-pressure area 21 in cooperation with the cooling device 14, and is located at a substantially central portion of the upper space 11A on the downstream side of the component inlet / outlet 7 in the cold air circulation direction. Will be placed. The partition plate 16 has two ventilation openings 18 formed therein, and the second ventilation position 1 is always operated so as to be located closer to the heat insulation door 8 than the first ventilation device 13.
9 and 19 are arranged respectively.

The cold air circulation space 11 includes an upper space 11A as a space above the ceiling wall 3A and a bottom space 11B as a space below the bottom wall 3B.
A front space 11C as a space outside the front side wall 3C, a rear space 11D as a space outside the rear wall 3D, and a left side wall 3E.
It is composed of a left space 11E as an outer space and a right space 11F as an outer space of the right wall 3F. In this example, the cooling device 14 is arranged in the upper space 11A.

On the other hand, a plurality of metal columns 30 are used to attach the inner box 3 to the outer box 2 at a predetermined interval. The plurality of struts 30 connect a space 11C formed by the front side wall 3C of the inner box and the outer box 2 to a front high pressure region 31 and a low pressure region 21 that communicate with the high pressure region 20 in the peripheral portions of the left and right sides of the heat insulating door 8. A first support column 33 that vertically separates the front low-voltage both 32 that communicate with each other,
A second column vertically partitioning a space 11D formed by the inner box rear side wall 3D and the outer box 2 into a rear high pressure region 34 communicating with the high pressure region 20 and a rear low pressure region 35 communicating with the low pressure region 21. It consists of 36 and.

In addition, the inner box 3 located in the low pressure area 21 of the cold air circulation space 11
A through hole 37 is formed in the left side wall 3E, and a small air blower 38 composed of a fan and a fan motor as a cool air introducing means is arranged therein, and further, in parallel with the same wall 3E, a storage chamber 10 is provided.
A small hole 39 having a diameter (about 50 mm) that does not affect the internal humidity is formed. In addition, a humidity sensor S2 that detects the humidity in the storage room 10 is provided in the storage room 10.

Furthermore, the upper space downstream of the through hole 37 in the low pressure area 21
An electric heater 40 for heating the cold air in the cold air circulation space 11 is arranged in 11A.

The cooling of the cold storage 1 in the above configuration will be described.

First, foods such as agricultural products such as vegetables and fruits are stored in the storage room 10 in an uncooled state, the set temperature is set to a refrigerating temperature zone (for example, + 2 ° C.), and the cooling device 14 is operated. Since the inside is higher than the set temperature, the cooling device 14 is operated by the control device (not shown) based on the output of the temperature sensor S1, and the air in the high pressure area 20 of the upper space 11A is the first blower device 13 Is sucked in, and after flowing into the cooler 12 to be cooled, it is blown out to the right space 11F.

On the other hand, the air in the cool air circulation space 11 is the second blower device 19,
It is forcedly circulated outside the inner box 3 by 19 and the upper space 11
It is guided from the high pressure area 20 of A through the front and rear right spaces 11C, 11D, 11F to the bottom space 11B, the left space 11E and the low pressure area 35.
The cooler 12 is located on the downstream side of the cold air flowing through the upper space 11A, and the cold air blown out from the cooler 12 also rides on this flow because it flows through the route returning to the low pressure area 21 of the upper space 11A. To circulate in space 11.

This cold air circulation cools the upper, lower, front, back, left and right walls 3A to 3F,
The inside of the storage chamber 10 is indirectly cooled by the radiant heat from each wall surface. In addition, a cold air circulation space that is closed by the partition plate 16
Due to the fact that the inside of 11 is divided into the high pressure area 20 and the low pressure area 21, the second blowers 19, 19 forcibly cause a pressure difference in the circulating cold air in the space, thereby making the cold air in this space wide. With the function of diffusing, cold air is circulated evenly in the cold air circulation space 11 to efficiently cool the entire inner box 3, and the storage chamber 10 can be cooled from the entire front, rear, left and right of the nadir.

Next, FIG. 4 shows the operation / stop of the small blower 38 and the storage room.
10 Indicates the relationship of internal humidity. The set humidity HS is, for example, 80%, HH is the upper limit humidity of 85%, and HL is the lower limit humidity of 75%. As can be seen from the figure, the cooling device 14 is intermittently operated based on the temperature of the storage chamber as described above, the blower device 19 is continuously operated, and the electric heater 40 is continuously energized to generate heat.
Note that the set humidity HS should be set to the optimum storage humidity according to the type of food to be stored.

By evaporation of water from food, when the humidity in the storage chamber 10 rises and reaches the upper limit humidity HH, based on the output of the humidity sensor S2, a controller (not shown) operates the small blower 38,
Through the through hole 37, the dry cold air in the cold air circulation space 11 is directly stored in the storage room 10
Introduce inside. At this time, the presence of the small holes 39 allows the cool air to be smoothly introduced into the closed space.

When the dry cold air is introduced, the humidity in the storage chamber 10 decreases, and when the lower limit humidity HL is reached, the controller stops the small air blower 38 based on the output of the humidity sensor S2, and stops the introduction of the cool air. By these control operations, the humidity in the storage room 10 is averaged and maintained at the set temperature HS. Further, the cold air introduced into the storage chamber 10 through the through holes 37 is the cold air flowing in the low pressure region 21 after flowing through the high pressure region 20 to increase the temperature, and the cold air in the low pressure region 21 is introduced into the storage chamber 10. By storage room
It is possible to avoid large fluctuations in temperature within 10, that is, large drops,
The temperature inside the storage chamber 10 can be stabilized.

When the cool air is introduced into the storage room 10, the cool air circulation space 11
The humidity inside may increase to 80% to 100% while the cooling device 14 is stopped because the dehumidifying action of the cooler 12 is lost. Even if the small air blower 38 is operated in such a situation, the decrease in humidity in the storage room 10 cannot be expected.

However, in the present invention, since the electric heater 40 generates heat, the operating rate of the cooling device 14 becomes high. Therefore, the humidity of the cool air in the cool air circulation space 11 decreases due to the activation of the dehumidifying action of the cooler 12, and is always 60% to 70%, so that the humidity in the storage room 10 is reduced if the small air blower 38 is operated. It is surely lowered and the humidity can be controlled smoothly. Further, since the electric heater 40 is provided on the downstream side of the through hole 37 in the low pressure area 21, it is possible to prevent cold air whose temperature has risen due to heat generation of the potential heater 40 from flowing into the storage chamber 10 through the through hole 37. Therefore, it is possible to slightly suppress the temperature fluctuation in the storage chamber 10 due to the introduction of cold air.

In the embodiment, the cool air introduction unit is configured by the small blower 38, but the invention is not limited to this, and the area of the through hole 37 is increased,
A combination of this and the opening / closing plate may be used. In that case, the opening / closing plate may be opened / closed based on the humidity sensor S2.

(G) Effect of the Invention As described above in detail, according to the present invention, the dry cold air in the cold air circulation space is introduced into the storage chamber by the cool air introducing means to appropriately reduce the humidity in the storage chamber. Let
The humidity in the storage chamber can be maintained at the set humidity according to the type of component, and the storage performance of the component can be further improved.
The cool air introduction means is provided in the inner box located in the low pressure area of the cold air circulation space, and the cool air blown out from the cooler flows through the high pressure area and cools the storage chamber through the inner box located in the high pressure area. After the temperature rises and then flows into the low-pressure zone, part of the cold air that has risen in temperature through the high-pressure zone is introduced into the storage chamber by the cold-air introduction means in the low-pressure zone, avoiding large fluctuations in the temperature inside the storage chamber. As a result of this,
The temperature in the storage chamber can be stabilized.

Furthermore, if the cool air circulation space is heated by the heater, the cooling operation rate by the cooler is improved, the cool air in the cool air circulation space can always be maintained in a dry state, and the introduction of cold air can surely lower the humidity in the storage chamber. It is possible to improve the controllability of humidity in the storage room. Further, since the cold air is heated by the heater provided on the downstream side of the cold air introducing means in the low pressure area, it is possible to prevent the heated cold air from flowing into the storage chamber from the cold air introducing means, and to cool the inside of the storage chamber by introducing the cold air. The temperature rise can be suppressed, and as a result, the temperature inside the storage chamber can be stabilized.

[Brief description of drawings]

FIG. 1 is a plan sectional view taken in the upper space of a low temperature refrigerator of the present invention, FIG. 2 is a longitudinal sectional view of the same, and FIG. 3 is AA of FIG.
A line sectional view, FIG. 4 is a diagram showing a transition of humidity in a storage room and a small blower. 1 ... Low temperature chamber, 2 ... Insulated outer box, 3 ... Inner box, 10 ... Storage room, 11 ... Cold air circulation space, 12 ... Cooler, 13 ... First
Blower, 14 ... Cooling device, 19, 19 ... Second blower, 37 ... Through hole, 38 ... Small blower, 39 ... Small hole, 40
Electric heater, S2 ... Humidity sensor.

Claims (2)

(57) [Claims] 1. A heat-insulating outer box, and a heat-conducting inner box which is arranged inside the outer box with a space therebetween and which forms a storage chamber therein.
In a low-temperature warehouse comprising a cool air circulation space formed between the outer box and the inner box, a cooler arranged in the cool air circulation space and a blower for forcedly circulating the cool air therein, the cold air circulation space is A cooling member is provided in the cold air circulation space for partitioning the high pressure area on the cool air discharge side of the blower device and the low pressure area on the cold air suction side of the air blowing position, and cold air introduction for introducing cold air in the low pressure area into the storage chamber. A low temperature warehouse, wherein the means is provided in an inner box located in the low pressure area, and the cold air introducing means is controlled based on the humidity in the storage chamber to maintain the storage chamber at a set humidity. 2. The low temperature warehouse according to claim 1, wherein a heater is arranged downstream of the cold air introducing means in the low pressure area.