JPH06159912A - Low temperature storage - Google Patents

Abstract

PURPOSE:To prevent the occurrence of temp. variations caused by opening and closing a door in a storage chamber of an indirect cooling type low temp. storage. CONSTITUTION:An inner case is provided within a heat insulating outer case 2 with a predetermined space defined therebetween to form a storage chamber 10. A cooling device is provided in this space to circulate cold air. An opening 4 is formed in the outer case 2 to take in and out articles. A door is installed in this opening 4 in such a manner as to permit its free opening and closing. A discharge opening 23 and a suction opening 26 are formed opposite each other on the side of the storage chamber 10 of the opening 4. Dampers 31 and 32 are provided to simultaneously open and close the discharge opening 23 and the suction opening 26, respectively. A jet of air is delivered from the aforesaid space through the discharge opening 23 down into the suction opening 26 and air feeding devices 27 are provided to form an air curtain at the opening 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low temperature chamber for indirectly cooling a storage chamber.

[0002]

2. Description of the Related Art Conventionally, in the case of storing articles such as fresh flowers and vegetables which do not like to be dried while keeping the freshness thereof, for example, Japanese Patent Laid-Open No. Hei 3 (1998).
An indirect cooling type low temperature chamber as shown in Japanese Patent Laid-Open No. 105186 (F25D17 / 08) is used. That is,
In the low temperature chamber of the above-mentioned publication, a heat-conducting inner box is arranged inside the heat-insulating outer box with a space, and the inside of the inner box serves as a storage chamber, and cold air is circulated between the two boxes. According to such a configuration, the storage chamber is indirectly cooled from the inner box, and since the storage chamber is not subjected to cooling due to direct cold air intrusion, drying is prevented, and therefore the fresh flower is preferably stored at high humidity. It can be stored while keeping the freshness of articles such as.

[0003]

However, such indirect cooling has a limited cooling capacity in the storage chamber as compared with direct cooling (in which cold air is directly introduced), so that the outside air temperature is particularly high, or When the temperature is low, that is, when the difference between the temperature inside the storage room and the outside air temperature is large, the temperature inside the storage room changes greatly due to the outside air entering the storage room from the article entrance / exit due to the opening / closing of the door. Also, it takes a considerable amount of time to return the changed temperature to the original temperature, so if the doors are continuously opened and closed, the difference between the storage room temperature and the outside air temperature will eventually disappear. Reach

Therefore, when the outside air temperature is lower than the storage room temperature, a low temperature trouble occurs in the stored article, and conversely, when the outside air temperature is higher than the storage room temperature, dew condensation occurs on the stored article. There is a problem that it may occur or may be deteriorated due to temperature rise. In order to solve this, for example, Japanese Unexamined Patent Publication No. 4-184070 (F25D23 / 0)
In 6), especially when the outside air temperature is high and the temperature in the storage chamber rises, a method of directly introducing the circulating cold air in the space between the inner and outer boxes into the storage chamber to lower the temperature is adopted. It does not prevent the temperature change in advance, but restores the changed temperature in the storage room.
Since the cold air is directly blown to the article, there is a problem that the article which does not like to be dried also suffers the same trouble as the direct cooling method.

The present invention has been made to solve the above-mentioned conventional technical problems, and in a so-called indirect cooling type low-temperature warehouse, temperature fluctuations in the storage chamber due to opening and closing of the door are prevented or suppressed in advance. The purpose is to

[0006]

That is, the low temperature cabinet 1 of the invention of claim 1 has a heat insulating outer box 2 and a predetermined space (air circulation space) 11 inside the outer box 2. A heat-conducting inner box 3 that is provided inside and forms a storage chamber 10, an article entrance / exit 4 formed in the outer box 2, a door 5 that opens and closes the article entrance / exit 4, and the space ( A cooling device 14 disposed in the air circulation space 11 and circulates the air cooled by the cooling device 14 into the space (air circulation space) 11 to indirectly cool the inside of the storage chamber 10. The discharge port 23 and the suction port 26, which are formed to face each other on the storage chamber 10 side of the article inlet / outlet 4 and communicate with the space (air circulation space) 11, respectively, and the discharge port 23 and the suction port 23. Dampers 31 and 32 for simultaneously opening and closing the mouths 26, respectively
And the air in the space (air circulation space) 11 is discharged from the discharge port 2
3 is provided with a blower device 27 that blows out toward the suction port 26 and forms an air curtain at the article entrance / exit 4.

Further, the low temperature warehouse 1 of the invention of claim 2 is provided with a heat-insulating outer box 2, a predetermined space (air circulation space) 11 provided inside the outer box 2, and inside the outer box 2. A heat-conductive inner box 3 forming a storage chamber 10, an article entrance / exit 4 formed in the outer box 2, and a door 5 for opening and closing the article entrance / exit 4.
And a cooling device 14 arranged in the space (air circulation space) 11, and the air cooled by the cooling device 14 is circulated in the space (air circulation space) 11 and stored in the storage chamber 10. And the suction port 26, which are formed to face each other on the storage chamber 10 side of the article inlet / outlet 4 and communicate with the space (air circulation space) 11, respectively. The dampers 31 and 32 that simultaneously open and close the discharge port 23 and the suction port 26, the drive device 34 that opens and closes the dampers 31 and 32, and the air in the space (air circulation space) 11 from the discharge port 23 to the suction port 26.
And an air blower 27 that forms an air curtain at the article entrance / exit 4, and the drive unit 34 is opened / closed by the dampers 31 and 32 based on the opening / closing of the door 5.
3 and the suction port 26 are opened and closed.

Further, the low temperature cabinet 1 of the third aspect of the present invention is provided with a heat-insulating outer case 2 and a predetermined space (air circulation space) 11 inside the outer case 2 and inside the outer case 2. A heat-conductive inner box 3 forming a storage chamber 10, an article entrance / exit 4 formed in the outer box 2, and a door 5 for opening and closing the article entrance / exit 4.
And a cooling device 14 arranged in the space (air circulation space) 11, and the air cooled by the cooling device 14 is circulated in the space (air circulation space) 11 and stored in the storage chamber 10. And the suction port 26, which are formed to face each other on the storage chamber 10 side of the article inlet / outlet 4 and communicate with the space (air circulation space) 11, respectively. The dampers 31 and 32 that simultaneously open and close the discharge port 23 and the suction port 26, the drive device 34 that opens and closes the dampers 31 and 32, and the air in the space (air circulation space) 11 from the discharge port 23 to the suction port 26.
And an air blower 27 that forms an air curtain at the article entrance / exit 4, and the drive unit 34 is driven by the dampers 31 and 32 based on the opening / closing of the door 5 to eject the discharge port 2
3 and the suction port 26 are opened and closed, and the discharge port 23 and the suction port 26 are kept open for a predetermined period after the door 5 is closed.

Furthermore, the low temperature refrigerator 1 of the invention of claim 4 is
A heat-insulating outer box 2 and a predetermined space (air circulation space) 11 are provided inside the outer box 2, and a storage chamber 10 is provided inside.
A heat-conducting inner box 3 that forms a member, an article entrance / exit 4 formed in the outer box 2, a door 5 that opens and closes the article entrance / exit 4, and a space (air circulation space) 11 And a cooling device (14) which circulates the air cooled by the cooling device (14) in the space (air circulation space) (11) to indirectly cool the inside of the storage chamber (10). Discharge ports 23 that are formed facing each other on the storage chamber 10 side of No. 4 and communicate with the space (air circulation space) 11 respectively.
And the suction port 26, dampers 31 and 32 for opening and closing the discharge port 23 and the suction port 26, respectively, rotatable cams 37 and 53, the cams 37 and 53, and both dampers 31 and 3.
2 and the arms 38, 54 and 39, 5 respectively
6 and a blower device 27 that blows air in the space (air circulation space) 11 from the discharge port 23 toward the suction port 26 to form an air curtain at the article inlet / outlet 4, and the cams 37, 53. Arm 38 by the forward and reverse rotation of
Both dampers 31, 32 are driven via 54, 39, 56 to open and close the discharge port 23 and the suction port 26 at the same time.

[0010]

According to the cryogenic chamber 1 of the invention of claim 1, when the door 5 is opened, the air in the space (air circulation space) 11 is discharged from the discharge port 23 toward the suction port 26 by the blower device 27. By forming an air curtain in the article entrance / exit 4, it is possible to prevent or suppress the outside air from entering the storage chamber 10 while the door 5 is open. Door 5
It is possible to prevent temperature fluctuations in the storage chamber 10 due to opening / closing of the storage compartment and prevent damage to stored items. In particular, since the dampers 31 and 32 for opening and closing the discharge port 23 and the suction port 26 at the same time are provided, the discharge port 23 and the suction port 26 are closed when the air curtain is not required during normal cooling operation. Can be, and therefore storage room 10
Unnecessary intrusion of the air in the space (air circulation space) 11 into the inside can be minimized.

Further, according to the low temperature warehouse 1 of the invention of claim 2, the air in the space (air circulation space) 11 is similarly discharged from the discharge port 23 toward the suction port 26 by the blower 27, and the article inlet / outlet port is opened. By forming an air curtain on 4, the outside air is prevented from entering the storage chamber 10 while the door 5 is open,
Alternatively, since it can be suppressed, it is possible to prevent temperature fluctuations in the storage chamber 10 due to opening / closing of the door 5 and prevent damage to the stored items. In particular, the discharge port 23
Since the dampers 31 and 32 for opening and closing the suction port 26 and the suction port 26 at the same time are provided, the discharge port 23 and the suction port 26 can be closed when the air curtain is not required. Interval (air circulation space) 1
1 In addition to being able to minimize unnecessary invasion of the internal air, the drive unit 34 for opening and closing the dampers 31, 32 is configured to open and close the discharge port 23 by the dampers 31, 32 based on the opening and closing of the door 5.
Further, since the suction port 26 is opened and closed, the air curtain can be automatically formed by opening the door 5, and the operability is remarkably improved.

Further, according to the low temperature warehouse 1 of the third aspect of the present invention, similarly, the air in the space (air circulation space) 11 is discharged from the discharge port 23 toward the suction port 26 by the blower 27, and the article inlet / outlet port is opened. By forming an air curtain on 4, the outside air is prevented from entering the storage chamber 10 while the door 5 is open,
Alternatively, since it can be suppressed, it is possible to prevent temperature fluctuations in the storage chamber 10 due to opening / closing of the door 5 and prevent damage to the stored items. In addition, the discharge port 23
Since the dampers 31 and 32 for opening and closing the suction port 26 and the suction port 26 at the same time are provided, the discharge port 23 and the suction port 26 can be closed when the air curtain is not required. Unnecessary intrusion of air in the space (air circulation space) 11 can be minimized. In particular, since the drive device 34 for opening / closing the dampers 31, 32 opens / closes the discharge port 23 and the suction port 26 by the dampers 31, 32 based on the opening / closing of the door 5, the air curtain is automatically formed by opening the door 5. Will be able to
The operability is remarkably improved, and the discharge port 23 and the suction port 26 are maintained in the open state for a predetermined period from the closing of the door 5, so that the temperature inside the storage chamber 10 increased by the invasion of the outside air can be rapidly lowered. It is a thing.

Furthermore, according to the cold storage 1 of the invention of claim 4, when the door 5 is similarly opened, the space (air circulation space) 11 from the discharge port 23 to the suction port 26 is blown by the blower 27. By injecting the above air and forming an air curtain at the article entrance / exit 4, it is possible to prevent or suppress outside air from entering the storage chamber 10 while the door 5 is open. Prevents temperature fluctuations within 10.
Alternatively, it is possible to suppress the occurrence of damage to the stored article before it occurs. In particular, dampers 31 and 32 for opening and closing the discharge port 23 and the suction port 26, and rotatable cams 37 and 53.
And both dampers 31, 32 are connected to arms 38, 54 and 3
9, 56 are connected to the cams 37, 53, and the forward rotation and the reverse rotation of the cams 37, 53 cause both dampers 31, 32 to rotate.
Since the discharge port 23 and the suction port 26 are opened and closed at the same time, the discharge port 23 and the suction port 26 can be closed when the air curtain is not required during normal cooling operation. Unnecessary invasion of air in the space (air circulation space) 11 into the storage chamber 10 can be minimized, and both dampers 31 and 32 can be simultaneously driven only by rotating the cams 37 and 53. Therefore, the number of power parts such as the motor 41 can be reduced in the case of automatic control, and the operability thereof can be remarkably improved in the case of manual control.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view of an article entrance / exit 4 portion of the low temperature warehouse 1 excluding the door 5, FIG. 2 is a vertical side view of the low temperature warehouse 1, and FIG. 3 is a vertical side view of the low temperature warehouse 1 of the article entrance / exit 4 portion. The cold storage 1 includes a top wall 2A, a bottom wall 2B, a front side wall 2C, a rear side wall (not shown), and left and right side walls, each of which is composed of a single or a plurality of heat insulating panels having a convex portion or a concave portion at a connecting portion with an adjacent panel. Two
A heat-insulating outer box 2 having a box body formed by combining E and 2F, and a top wall 3A, a bottom wall 3B, a front wall 3C, not shown, which are arranged inside the outer box 2 at intervals. A box-shaped heat-conducting inner box 3 composed of rear side walls and left and right side walls 3E, 3F, a storage chamber 10 configured to be hermetically sealed in the inner box 3, and the upper, lower, front, rear, left and right boxes 2, And an air circulation space 11 having an interval of 3 intervals.

Each wall 3A, 3B, 3 constituting the inner box 3
Each of C, 3E and 3F (similar to the rear side wall) is composed of a single or a plurality of panels made of a stainless steel plate, and a part of the left and right side walls 3E and 3F is generated from articles such as fresh flowers to be stored. It is equipped with a green tuff (not shown) that allows ethylene gas to permeate and adsorb it. Further, the top wall 3A of the inner box 3 is gradually inclined to the left and right with the center as the apex, so that the water droplets adhering to the lower surface of the top wall 3A do not drop downward as they are, and the left and right side walls 3E, 3F.
It is designed to flow along the inner surface. Front wall 2C of outer box 2
An article entrance / exit 4 for inserting and removing articles such as fresh flowers and vegetables is formed on the outer surface of the front wall 2C of the outer box 2.
A heat-insulating door 5 is provided to close the storage chamber 10 and to close the storage chamber 10.

A ceiling wall 3A constituting the air circulation space 11
A cooler 12 that constitutes a refrigeration cycle of the cooling device 14 and a cooling blower device 13 that includes a blower fan and a blower fan motor are disposed on the lower surface of the upper right end. A drainage device 15 including a drainage pipe with a heater led out to the outside is connected and connected. Further, a compressor and a condenser (not shown) that constitute the refrigeration cycle of the cooling device 14 are installed on the upper surface of the ceiling wall 3A. On the other hand, a circulation blower 18 is attached to the upper left lower surface of the ceiling wall 3A located on the leeward side of the cooling blower 13.

Assuming that the set temperature in the storage chamber 10 is 0 ° C., a thermostat (not shown) for detecting the temperature in the air circulation space 11 raises the temperature in the air circulation space 11 to, for example, -1 ° C. At the time point, the compressor of the cooling device 14 and the cooling blower device 13 are operated, and are stopped when the temperature reaches -3 ° C. The cool air that has exchanged heat with the cooler 12 is discharged from the cooling blower device 13 into the air circulation space 11,
Then, by the circulating blower 18 which is constantly operated, the air is circulated in the air circulation space 11 uniformly as shown by the arrow in FIG. As a result, the wall surface of the inner box 3 is cooled to an average of about -2 ° C, and the inside of the storage chamber 10 is indirectly cooled from the wall surface of the inner box 3 and maintained at about 0 ° C. Further, the indirect cooling suppresses the drying in the storage chamber 10 and maintains the high humidity, so that the stored articles such as the fresh flowers and vegetables can be stored with good freshness. Further, ethylene gas generated from the article permeates the green tuff,
Also, since it is adsorbed to it, aging due to ethylene gas is also prevented.

On the other hand, on the storage room 10 side of the article entrance / exit 4,
A frame-shaped door panel 21 that extends from the outer box 2 to the inner box 3 and forms a part of a front wall 3C of the inner box 3 is attached, and the door panel 21 is located above the storage chamber 10 side of the article entrance / exit 4.
A discharge port 23 formed of a plurality of slits is provided on the lower side of the upper plate 22, and a lower plate 24 of the door panel 21 located at a lower portion of the article entrance / exit 4 on the storage chamber 10 side and facing the upper plate 22.
A suction port 26, which is also composed of a plurality of slits, is formed on the upper side. The discharge port 23 communicates with the upper air circulation space 11 and the suction port 26 communicates with the lower air circulation space 11. Further, two blowers 27 shown in FIG. 4 are arranged side by side by a mounting plate 28 between the upper plate 22 of the door panel 21 and the outer box 2 so as to correspond to above the discharge port 23. .

Further, the discharge port 23 and the suction port 2 are provided on the lower surface of the lower side of the upper plate 22 of the door panel 21 and the lower surface of the upper side of the lower plate 24.
Dampers 31 and 32 for opening and closing the opening 6 are rotatably and pivotally supported, and a drive unit 34 for opening and closing the dampers 31 and 32 is provided at a substantially central portion of the inner surface of the side plate 33 of the door panel 21. Is attached. This drive 3
Reference numeral 4 denotes an elliptical cam 37 rotatably attached to a horizontal rotation shaft 36 as shown in FIG. 5, and an extendable arm for rotatably connecting the cam 37 and the dampers 31, 32. 38, 39 and the cam 37 by the rotating shaft 36.
A motor 41 (shown in FIG. 6) that can rotate forward and backward
And a closing detection switch 42 and an opening detection switch 43, which are limit switches for contacting the cam 37 and detecting the closed and open positions of the dampers 31, 32. Further, a door switch 44 for detecting opening / closing of the door 5 is attached to the upper part of the side surface of the article entrance / exit 4.

Next, FIG. 6 shows an electric circuit of the blower 27 and the controller 46 of the motor 41. The door switch 44, the close detecting switch 42 and the open detecting switch 43 are input to the general-purpose microcomputer 47. The air blower 27 and the motor 41 are connected to the output of the microcomputer 47, respectively. The operation of the controller 46 will be described with reference to the flowchart showing the program of the microcomputer 47 of FIG. 7 and the timing chart of FIG. Now, assuming that the door 5 is opened at time t1 in FIG. 8, the microcomputer 47 detects it based on the door switch 44, and proceeds from step S1 to step S2 in FIG. 7 to operate the blower 27. . The blower 27 is operated to forcibly blow the circulating cold air in the air circulation space 11 onto the discharge port 23 as indicated by the arrow in FIG. Next, the microcomputer 47 starts normal rotation of the motor 41 of the drive device 34 in step S3. As a result, the cam 37 is rotated clockwise in FIG. 5, so that the arm 38 is pulled down and the arm 39 is pushed down.
The dampers 31 and 32 connected to are rotated counterclockwise in FIG. 3 to open the discharge port 23 and the suction port 26 at the same time.

The microcomputer 47 carries out step S4.
It is determined whether or not the open detection switch 43 is closed (ON), and if not, the rotation of the motor 41 is continued. Then, as shown in FIG. 10, the upper and lower dampers 31 and 32 are connected to the discharge port 2.
When the valve 3 and the suction port 26 are fully opened, the cam 37 contacts the open detection switch 43 and closes it (ON) as shown in FIG. 9, so that the microcomputer 47 proceeds to step S5 to stop the normal rotation of the motor 41.

When the discharge port 23 and the suction port 26 are opened in this manner, the cool air in the air circulation space 11 blown from the blower 27 is blown from the discharge port 23 toward the suction port 26. An air curtain from top to bottom is formed in the article entrance / exit 4 by the cold air. The air curtain prevents or suppresses the invasion of the outside air from the article entrance / exit 4 into the storage room 10. Therefore, the temperature fluctuation in the storage room 10 due to the invasion of the outside air is prevented or remarkably reduced, and the low temperature obstacle of the stored article and the dew condensation. And the like are prevented from occurring.

The formation of this air curtain is continued in step S6 while the door 5 is open, and when the door 5 is closed at time t2 in FIG. 8, the microcomputer 47 detects it by the door switch 44. Then, the process proceeds to step S7, the 5-minute delay timer having the function is integrated, and the state is maintained until the integration is completed. That is, the microcomputer 47 maintains the open state without closing the discharge port 23 and the suction port 26 for 5 minutes after the door 5 is closed, and continues the operation of the blower 27 to form the air curtain. .

At time t3, which is five minutes after the door 5 is closed, the microcomputer 47 executes step S3.
Then, the process proceeds to step 8, and the reverse rotation of the motor 41 is started. As a result, the cam 37 is rotated counterclockwise in FIG. 9,
The arm 38 is pushed up and the arm 39 is pulled up, and the dampers 31 and 32 connected to the arms 38 and 39 are rotated clockwise in FIG. 10 to simultaneously close the discharge port 23 and the suction port 26. .

The microcomputer 47 carries out step S9.
It is determined whether or not the close detection switch 42 is closed (ON), and if not, the rotation of the motor 41 is continued. Then, as shown in FIG. 3, the upper and lower dampers 31 and 32 are connected to the discharge port 23.
When the suction port 26 is closed, the cam 37 comes into contact with the closing detection switch 42 and closes it (ON) as shown in FIG.
The microcomputer 47 proceeds to step S10 to stop the reverse rotation of the motor 41, and then also stops the blower device 27 at step S11.

As described above, since the air curtain is automatically formed at the article entrance / exit 4 in association with the opening of the door 5,
Operability is significantly improved. Even if the door 5 is closed, the air curtain is continuously formed for 5 minutes thereafter. Since a part of the cool air forming the air curtain flows into the storage chamber 10, when the temperature inside the storage chamber 10 is raised by the outside air that has flowed in while the article entrance / exit 4 is opened by the door 5. Will be able to quickly reduce it back to its original temperature. Further, since both the dampers 31 and 32 close the discharge port 23 and the suction port 26 during the normal cooling operation, the cool air in the air circulation space 11 does not unnecessarily leak into the storage chamber 10, and accordingly, Drying of stored items is also prevented.

Further, the cam 37 and the two arms 38, 39
By using the above, it becomes possible to simultaneously open and close the upper and lower dampers 31, 32 by a single motor 41, so that the number of power components such as motors and solenoids can be reduced. Next, FIG. 12 is a perspective view of an article entrance / exit 4 portion of the low temperature warehouse 1 excluding a door 5 for explaining another damper opening / closing structure. In addition, in FIG. 12, FIG.
Those having the same reference numerals as are the same. In this case, the drive device 3
4, the opening / closing device 51 for manually opening / closing the dampers 31, 32 is replaced with the side plate 33 of the door panel 21.
It is attached to the center of the inner surface. This switchgear 5
As shown in FIG. 13, the reference numeral 1 is rotatably attached to a horizontal rotation shaft 52, and a cam 53 having stop surfaces 58 and 59, and the cam 53 and the dampers 31 and 32 are rotatably connected to each other. Extendable arms 54 and 56 and rotating shaft 52
The lever 57 attached to the stop surface 5 of the cam 53
Stoppers 61 for contacting the cams 8 and 59 to stop the cams 53 at the closed and open positions of the dampers 31 and 32,
And 62.

The operation of the opening / closing device 51 having such a configuration will be described. In this case, the blower device 27 is constantly operated, and the circulating cold air in the air circulation space 11 is forcibly blown to the discharge port 23 as in FIG. In addition, as shown in FIG.
It is assumed that the dampers 31 and 32 close the discharge port 23 and the suction port 26 in the state where the stop surface 58 of the above is in contact with the stopper 61. When the user opens the door 5 and then turns the cam 53 in the clockwise direction in FIG. 13 by holding the lever 57 (normal rotation), the arm 54 is pulled down and the arm 56 is pushed down. ,
The dampers 31 and 32 connected to the arms 54 and 56 rotate counterclockwise in FIG. 3 to open the discharge port 23 and the suction port 26 at the same time.

Then, similarly to FIG. 10, the upper and lower dampers 31 are provided.
And 32 completely open the discharge port 23 and the suction port 26, the stop surface 59 of the cam 53 stops at the stopper 62.
It cannot rotate any more, so that the user can confirm the opening of the dampers 31, 32. When the discharge port 23 and the suction port 26 are opened in this manner, the cool air in the air circulation space 11 blown from the air blower 27 is also blown from the discharge port 23 toward the suction port 26. Thus, an air curtain from top to bottom is formed in the article entrance / exit 4. The air curtain prevents or suppresses the entry of outside air from the article entrance / exit 4 into the storage chamber 10.
The temperature fluctuation within 0 is prevented or significantly reduced, and the occurrence of low-temperature obstacles, dew condensation, etc. of the stored articles is prevented.

When the door 5 is closed, the lever 57 is held in front of it and the cam 53 is rotated (reversely) counterclockwise in FIG. 14, the arm 54 is pushed up and the arm 56 is moved. As it is pushed down, the dampers 31 and 32 connected to the arms 54 and 56 rotate clockwise in FIG. 10 to open the discharge port 23 and the suction port 26 at the same time. When the upper and lower dampers 31 and 32 close the discharge port 23 and the suction port 26 as in FIG. 3, the stop surface 58 of the cam 53 stops at the stopper 61, so that the cam 53 cannot rotate any more, and the user is prevented from rotating further. Is the damper 31, 32
You can check the closure of the. Therefore, during the normal cooling operation, the discharge port 23 and the suction port 26 can be closed by the dampers 31 and 32, so that the cool air in the air circulation space 11 does not unnecessarily leak into the storage chamber 10 and thus is stored. Drying of the article is also prevented.

Further, the cam 53 and the two arms 54, 56
Since the upper and lower dampers 31, 32 can be simultaneously opened and closed by using one lever 57, the operability in manually opening and closing the dampers 31, 32 is significantly improved.

[0032]

As described in detail above, according to the first aspect of the present invention, when the door is opened, the air is discharged from the discharge port toward the suction port by the air blower so that the air in the space between the inner and outer boxes is discharged, and the article inlet / outlet port is opened. Since the air curtain can be formed on the inside, outside air can be prevented or suppressed from entering the storage chamber while the door is open. As a result, it is possible to prevent or suppress temperature fluctuations in the storage chamber due to opening and closing of the door in the indirect cooling type low temperature warehouse, and prevent damage to the stored articles. Especially, since the damper that opens and closes the discharge port and the suction port at the same time is provided, the discharge port and the suction port can be closed when the air curtain is not required during normal cooling operation, and therefore, the storage chamber It is possible to prevent unnecessary ingress of air in the space to a minimum and prevent the stored articles from drying.

Further, according to the second aspect of the present invention, similarly, the air in the interval can be discharged from the discharge port toward the suction port by the air blower and the air curtain can be formed at the article entrance / exit, so that the door is opened. The outside air can be prevented or suppressed from entering the inside storage chamber. This makes it possible to prevent or suppress temperature fluctuations in the storage chamber due to opening and closing of the door, and prevent damage to stored items. In particular, since a damper that opens and closes the discharge port and the suction port at the same time is provided, the discharge port and the suction port can be closed when the air curtain is not required, and thereby the air in the space into the storage chamber can be closed. Unnecessary intrusion can be minimized and the stored items can be prevented from drying, and the drive device that opens and closes the damper opens and closes the discharge port and suction port based on the opening and closing of the door. The air curtain can be automatically formed, and the operability is remarkably improved.

Further, according to the third aspect of the invention, similarly, the air in the interval can be discharged from the discharge port toward the suction port by the air blower to form the air curtain at the article entrance / exit, so that the door is opened. The outside air can be prevented or suppressed from entering the inside storage chamber. This makes it possible to prevent or suppress temperature fluctuations in the storage chamber due to opening and closing of the door, and prevent damage to stored items. Also, since a damper that opens and closes the discharge port and the suction port at the same time is provided, the discharge port and the suction port can be closed when the air curtain is not required, and therefore, the air in the space into the storage chamber can be closed. Unnecessary intrusion can be minimized to prevent the stored items from drying. In particular, since the drive device for opening and closing the damper opens and closes the discharge port and the suction port by the damper based on the opening and closing of the door, it becomes possible to automatically form the air curtain by opening the door, resulting in remarkable operability. Since the discharge port and the suction port are kept open for a predetermined period after the door is closed, it is possible to quickly reduce the temperature inside the storage chamber that has risen due to invasion of outside air while the door is open.

Further, according to the invention of claim 4, similarly, when the door is opened, the air within the interval is discharged from the discharge port toward the suction port by the air blower to form the air curtain at the article entrance / exit. By doing so, it is possible to prevent or suppress the invasion of outside air into the storage room while the door is open, so that the temperature fluctuation in the storage room due to the opening and closing of the door can be prevented or suppressed, and the damage to the stored items can be prevented. Will be able to prevent. In particular, a damper that opens and closes the discharge port and suction port and a rotatable cam are provided, both dampers are connected to the cam by an arm, and both forward and reverse rotations of this cam simultaneously open and close the discharge port and suction port. Therefore, when the air curtain is not needed during normal cooling operation, the discharge port and the suction port can be closed and placed, which prevents unnecessary entry of air in the space into the storage chamber. Since it is possible to minimize the drying of stored items and both dampers can be driven simultaneously by only rotating the cam, it is possible to reduce the number of power parts such as motors when performing automatic control. In addition, the cost can be reduced, and the operability in the case of manual operation is significantly improved.

[Brief description of drawings]

FIG. 1 is a perspective view of an article entrance / exit portion excluding a door of a cold storage of the present invention.

FIG. 2 is a vertical cross-sectional side view of a cold storage.

FIG. 3 is a vertical cross-sectional side view of the cold storage of the article entrance / exit portion with the damper closed.

FIG. 4 is a perspective view of a blower device.

FIG. 5 is a front view of the drive device with the damper closed.

FIG. 6 is an electric circuit diagram of a blower and a motor controller.

FIG. 7 is a flowchart showing a program of a microcomputer.

FIG. 8 is a timing chart for explaining operations of a blower, a motor, and the like.

FIG. 9 is a front view of the drive device with the damper open.

FIG. 10 is a vertical cross-sectional side view of the low temperature warehouse at the article entrance / exit with the damper open.

FIG. 11 is a vertical cross-sectional side view of the blower device portion of the low temperature chamber.

FIG. 12 is a perspective view of an article entrance / exit portion for explaining a manual damper opening / closing structure excluding a door of a low-temperature storage.

FIG. 13 is a front view of the opening / closing device with the damper closed.

FIG. 14 is a front view of the opening / closing device with the damper open.

[Explanation of symbols]

 1 Low Temperature Box 2 Outer Box 3 Inner Box 4 Article Entrance / Exit 5 Door 10 Storage Room 11 Air Circulation Space 14 Cooling Device 23 Discharge Port 26 Suction Port 31 Damper 32 Damper 34 Drive Device 37 Cam 38 Arm 39 Arm 41 Motor 44 Door Switch 46 Control Device 51 Switchgear 53 Cam 54 Arm 56 Arm

Claims (4)

[Claims] 1. A heat-insulating outer box, a heat-conducting inner box which is disposed inside the outer box with a predetermined space and forms a storage chamber therein, and the outer box. And a cooling device arranged in the interval, wherein air cooled by the cooling device is circulated in the interval and the storage chamber is opened. In a low-temperature chamber that indirectly cools, the discharge port and the suction port, which are formed to face each other on the storage chamber side of the article inlet and outlet and communicate with each other at the intervals, and a damper that simultaneously opens and closes the discharge port and the suction port, respectively. And a blower that blows air in the space from the discharge port toward the suction port to form an air curtain at the article inlet / outlet. 2. A heat-insulating outer box, a heat-conducting inner box which is disposed inside the outer box with a predetermined space therebetween and forms a storage chamber therein, and the outer box. And a cooling device arranged in the interval, wherein air cooled by the cooling device is circulated in the interval and the storage chamber is opened. In a low-temperature chamber that indirectly cools, the discharge port and the suction port, which are formed to face each other on the storage chamber side of the article inlet and outlet and communicate with each other at the intervals, and a damper that simultaneously opens and closes the discharge port and the suction port, respectively. A drive device that opens and closes the damper, and a blower device that blows air in the interval from the discharge port toward the suction port to form an air curtain at the article inlet / outlet. To the damper based on the opening and closing of the door A low-temperature chamber characterized by opening and closing the discharge port and the suction port. 3. A heat-insulating outer box, a heat-conducting inner box that is disposed inside the outer box at a predetermined interval and forms a storage chamber therein, and the outer box is formed. And a cooling device arranged in the interval, wherein air cooled by the cooling device is circulated in the interval and the storage chamber is opened. In a low-temperature chamber that indirectly cools, the discharge port and the suction port, which are formed to face each other on the storage chamber side of the article inlet and outlet and communicate with each other at the intervals, and a damper that simultaneously opens and closes the discharge port and the suction port, respectively. A drive device that opens and closes the damper, and a blower device that blows air in the interval from the discharge port toward the suction port to form an air curtain at the article inlet / outlet. To the damper based on the opening and closing of the door A low-temperature storage, wherein the discharge port and the suction port are opened and closed, and the discharge port and the suction port are kept open for a predetermined period after the door is closed. 4. A heat-insulating outer box, a heat-conducting inner box which is disposed inside the outer box at a predetermined interval and forms a storage chamber therein, and the outer box. And a cooling device arranged in the interval, wherein air cooled by the cooling device is circulated in the interval and the storage chamber is opened. In a low-temperature warehouse that indirectly cools, a discharge port and a suction port that are formed to face each other on the storage chamber side of the article inlet and outlet and communicate with each other at the intervals, and a damper that opens and closes the discharge port and the suction port, respectively. A rotatable cam, an arm connecting the cam and the dampers, and air blown from the discharge port toward the suction port to form an air curtain at the article inlet / outlet. The device includes a device, and the cam moves forward and backward. A low-temperature warehouse characterized in that both the dampers are driven through the arm by reversing and opening and closing, and the discharge port and the suction port are opened and closed at the same time.