JPH0571860A - Refrigerated storage - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a cooling storage room that prevents dust from entering through an outside air inlet for humidifying a storage room. [Constitution] An inner hollow door frame 27 is provided extending from the upper surface of the heat insulating box 2 to the upper wall 2A and above the door 3. Door 3
An outside air intake port 28 that communicates the outside with the inside of the door frame 27 is formed on the lower surface of the door frame 27 corresponding to the upper surface.
A filter 30 is detachably attached to the outside air intake port 28. An outside air introduction port 32 that connects the inside of the door frame 27 and the storage chamber 8 is formed in the ceiling wall 2A. A cold air discharge passage 42 is formed which communicates the high pressure portion 7A of the cold air passage 7 with the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold storage such as a low temperature showcase or a refrigerator, and more particularly to a cold storage for adjusting the humidity in a storage chamber by introducing outside air.

[0002]

2. Description of the Related Art Conventionally, in a cooling storage for storing articles such as wine and fresh flowers which are required to be cooled and stored at high humidity, a back wall of a heat insulating box is disclosed, for example, in Japanese Patent Publication No. 59-49511. Two holes are formed at the top and bottom, and outside air is introduced from one hole and cold air in the storage chamber is discharged from the other hole. According to such a structure, the outside air having a relatively high humidity is introduced into the storage chamber whose humidity has been lowered by the cooling by the evaporator, so that the storage chamber can be humidified.

[0003]

However, only by forming a hole as in the prior art, dust around the cooling storage is sucked from this hole and enters the storage chamber. Since such dust also contains microorganisms such as bacteria, the microorganisms propagate inside the highly humid storage chamber and become unsanitary.

Further, if the hole for introducing the outside air is located at the back of the cold storage, it becomes easy to introduce low humidity air at high temperature around the electric compressor and the condenser, so that the humidifying capacity of the storage chamber is lowered, while Causes unnecessary temperature rise. Furthermore, if the hole for introducing the outside air and the hole for discharging the cool air are present on the same wall surface, a short circuit occurs between the holes, and the discharged cool air is directly introduced, which also contributes to the humidification capacity of the storage chamber. There was also a problem of decrease.

The present invention has been made to solve the above-mentioned conventional technical problems, and it is an object of the present invention to provide a cooling storage box in which dust is prevented from entering from an outside air inlet for humidifying a storage chamber. It is intended.

It is another object of the present invention to provide a cooling storage compartment in which the outside air inlet is separated from the cold air outlet to prevent a short circuit between the two.

[0007]

According to a first aspect of the present invention, there is provided a cold storage (low temperature showcase) 1 in which a storage chamber 8 and a cold air passage 7 are provided inside a heat insulating box 2 having a door 3 which can be opened and closed at a front opening. And the cooling chamber 8 is cooled by the evaporator 16 and the cool air circulation blower 17 disposed in the cold air passage 7, and extends from the upper surface of the heat insulating box body 2 to the upper side of the door 3 to the upper side of the door 3. A door frame 27 having a hollow inside is provided to extend the door 3
An outside air intake port 28 that communicates the outside with the inside of the door frame 27 is formed on the lower surface of the door frame 27 corresponding to the upper surface, a filter 30 is detachably attached to this outside air intake port 28, and a door is provided on the top wall 2A of the heat insulating box 2. A cool air discharge passage 42 that forms an outside air inlet 32 that communicates the inside of the frame 27 with the storage chamber 8 and communicates the high pressure portion 7A of the cool air passage 7 with the outside.
Is formed.

In the cooling storage (low temperature showcase) 1 of the invention of claim 2, a storage chamber 8 and a cold air passage 7 are defined inside a heat insulating box 2 having a door 3 which can be opened and closed at a front opening. The storage chamber 8 is cooled by the evaporator 16 and the blower 17 for cold air circulation arranged in the cold air passage 7, and the hollow interior extends from the upper surface of the heat insulating box 2 to the upper wall 2A and above the door 3. The door frame 27 is provided, and an outside air intake 28 that communicates the outside with the inside of the door frame 27 is formed on the lower surface of the door frame 27 corresponding to the upper surface of the door 3.
An outside air introduction port 32 that connects the inside of the door frame 27 and the storage chamber 8 is formed in the interior of the door frame 27, and the heat insulating box body 2 behind the door frame 27 is formed.
A cool air discharge passage cover 34 having an inner hollow is attached to the upper surface of the ceiling wall 2A, and a cool air discharge port 41 that communicates the outside with the inside of the cool air discharge passage cover 34 is formed in the cool air discharge passage cover 34, and the heat insulating box body 2 ceiling wall The cold air discharge port 37 that connects the inside of the cold air discharge passage cover 34 and the high pressure portion 7A of the cold air passage 7 to 2A.
Is formed.

[0009]

According to the first aspect of the present invention, the filter 30 prevents the entry of dust from the outside air intake port 28. Since the filter 30 is located above the door 3, it can be easily attached and detached. In particular, since the outside air intake port 28 exists on the lower surface of the door frame 27, dust is unlikely to accumulate on the filter 30. Further, the outside air intake 28 is a cooling storage (low temperature showcase).
The electric compressor 12 and the condenser 1 exist because they exist in the front upper part.
3 Do not introduce air with high temperature and low humidity around it.

According to the invention of claim 2, the outside air inlet 32
Communicates with the outside only through the outside air intake 28 through the inner space of the door frame 27, and the cool air discharge port 37 communicates with the outside only through the cool air discharge passage cover 34 inside the cool air discharge port 41. Since the outside air intake 28 is at the front of the cold storage (low temperature showcase) 1 and the cool air discharge port 41 is at the cool air discharge path cover 34 behind the door frame 27, the outside air inlet 32 and the cool air discharge port 37 are insulated from each other. Wall 2 of body 2
Even if formed in A, a short circuit between them does not occur. Further, since the outside air intake 28 is present in the upper front part of the cooling storage (low temperature showcase) 1 as in claim 1, the high temperature and low humidity air around the electric compressor 12 and the condenser 13 is not introduced.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows a vertical cross-sectional view of a heat insulating box body 2 top wall 2A portion of a low temperature showcase 1 as an embodiment. FIG. 2 is a perspective view of the low temperature showcase 1, FIG. 3 is the same vertical sectional view, and FIG. 4 is the same. The cutaway perspective views are respectively shown.

The heat-insulating box body 2 is constructed by foaming and filling a heat insulating material such as polyurethane foam between both inner and outer boxes which are open to the front, and a double door type door 3 in which transparent glass is fitted in the front opening. 3 is attached to be openable and closable.
Inside the heat insulating box 2, a heat conducting wall 4 made of, for example, a thin coated steel plate, is arranged at a distance from the heat insulating box 2. The heat conducting walls 4 are the back wall 2B and the top wall 2 of the heat insulating box 2.
A rear plate 4B which is spaced from A and the bottom wall 2C, and whose left and right ends are in contact with the inner surfaces of the left and right side walls 2D and 2E of the heat insulating box 2 and is fixed to the back wall 2B at a predetermined angle, and the heat insulating box. The left and right side walls 2D, 2E, the top wall 2A, and the bottom wall 2C are spaced apart from each other, and the rear end is brought into contact with the front surface of the rear plate 4B, and the front end is brought into contact with the left and right side walls 2D, 2E. Two
Left and right side plates 4D and 4E fixed to D and 2E, and a space between the top wall 2A and the left and right side walls 2D and 2E of the heat insulating box 2,
Moreover, the rear end is brought into contact with the front surface of the rear plate 4B, and the front end is attached to the top wall 2A.
A top plate 4A that is abutted against the same and is also fixed to the top wall 2A
And is separably and detachably supported by the left and right side plates 4D, 4E so as to be spaced from the bottom wall 2C and the left and right side walls 2D, 2E of the heat insulating box 2, and the rear end thereof is brought into contact with the front face of the rear plate 4B. , And a bottom plate 4C whose front end is brought into contact with the front end of the bottom wall 2C directly or via another member.

The substantially airtight space formed between the heat conducting wall 4 and the heat insulating box 2 serves as the cold air passage 7, and the heat conducting wall 4 is provided.
The storage space 8 for storing wine, fresh flowers, and fresh foods is set in the inner space of the storage space. In the embodiment, the storage space 8 is stored.
A plurality of shelves 9 for placing wine therein are detachably installed. Machine room 11 formed under the heat-insulating box 2
An electric compressor 1 that constitutes a refrigeration cycle inside
2, the condenser 13, the fan 14 for condenser, etc. are installed. The condenser blower 14 is operated to suck outside air from the front, cools the condenser 13 and the electric compressor 12 by air, and then discharges the high-temperature and low-humidity air to the rear of the low-temperature showcase 1.

In the cool air passage 7 between the back wall 2B of the heat insulating box 2 and the back plate 4B of the heat conducting wall 4, the evaporator 16 which constitutes the refrigeration cycle together with the electric compressor 12, the condenser 13 and the like.
Further, four cool air circulation blowers 17 are arranged side by side in the cool air passage 7 above the evaporator 16. A refrigerant such as R-502 is enclosed in the refrigeration cycle. A water tray 18 is disposed in the cold air passage 7 below the bottom plate 4C, and the defrost water of the evaporator 16 is placed in the water tray 18 in the drain pipe 1.
It is configured to flow in through 9. The water tray 18 communicates with the storage chamber 8 through a plurality of humidifying small holes 20 formed in the bottom plate 4C, and the defrosting water stored in the water tray 18 humidifies the inside of the storage chamber 8 and water. A raised portion 21 is further formed on the dish 18, and a suction hole 22 is formed in the raised portion 21.

Electric compressor 12 and blower 17 for cold air circulation
Is controlled by the controller 24 based on the output of the temperature sensor 23 that detects the temperature in the storage chamber 8, and operates at an upper limit temperature + 10 ° C and a lower limit temperature + 6 ° C centered around the set temperature (storage chamber 8) + 8 ° C, for example. , Stopped. At this time, the temperature of the evaporator 16 drops to about -5 ° C, and the cool air circulation blower 1
When 7 is operated, the cool air cooled by the evaporator 16 is sucked up as shown by the arrow in FIG. 4 to rise in the cool air passage 7 between the back plate 4B and the back wall 2B, and between the top plate 4A and the top wall 2A. Cold aisle 7
Flowing in to the front and proceeding forward, becoming a high pressure and shunting to the left and right, descending the cold air passage 7 between the left and right side plates 4D, 4E and the left and right side walls 2D, 2E to lower the cold air passage 7 between the bottom plate 4C and the bottom wall 2C. Circulation to the cold air passage 7 between the back plate 4B and the back wall 2B below the evaporator 16 is finally performed. By this cold air circulation, the temperature in the cold air passage 7 is lowered to about −2 ° C., and the inside of the storage chamber 8 is indirectly cooled from the wall surface of the heat conducting wall 4 and maintained at the set temperature.

Further, in the portion corresponding to the high pressure portion 7A of the cool air passage 7 in the front portion of the top plate 4A, two blowout holes 25 having a diameter of 8 mm, for example, are formed in two places, and the cool air circulating in the cool air passage 7 is A small amount is blown into the storage chamber 8 through the blowout holes 25. This agitates the air in the storage room 8 and
The internal temperature is made uniform. The air in the storage chamber 8 passes through the humidification small hole 20 of the bottom plate 4C and the suction hole 22 of the water tray 18 and returns to the cold air passage 7. By such cooling, the inside of the storage chamber 8 is maintained at a set temperature, for example, + 8 ° C., but this cooling is indirect cooling from the heat conducting wall 4 and a small amount of cool air from the blowout holes 25. Drying of internal wine and fresh flowers during driving is minimized.

A door frame 27 as a decoration is attached to the left and right of the upper surface of the top wall 2A of the heat insulating box 2 in the front. The door frame 27 is hollow inside and has a heat insulating box 2.
It extends from the top wall 2A to the front in an eaves-like shape and reaches above the door 3. An outside air intake port 28 is formed in the lower surface of the door frame 27 corresponding to the upper surface of the door 3 so as to correspond to the door 3. A pair of rails 29, 29 as shown in FIG. 5 are formed on both lower sides of the outside air intake port 28, and a dust removing filter 30 corresponds to the lower surface of the outside air intake port 28 between the rails 29, 29, and the door frame 27. And the door 3 are engaged with each other so as to be slidable in the front-rear direction.

At this time, the distance between the filter 30 and the upper surface of the door 3 is set to about 5 mm to 10 mm to ensure the circulation of outside air.
Further, the filter 30 is formed with a handle portion 35 located between the filter 30 and the door 30. When cleaning the filter 30, first open the door 3 as shown in FIG. To easily filter 30 by rail 2
It can be removed from 9, 29.

Further, at the top wall 2A of the heat-insulating box 2 corresponding to the rear portion of the door frame 27, there are installed cylinders 31 penetrating through six places, and inside this, a storage chamber 8 in front of the top plate 4A and the interior of the door frame 27. An outside air inlet 32 that communicates with Further, the outside air intake 28 and the door frame 27
The internal space and the external air introduction port 32 constitute the external air introduction passage 33.

On the other hand, the heat insulating box 2 behind the door frame 27
On the upper surface of the ceiling wall 2A of the cold air exhaust passage cover 34,
Is attached. The cold air exhaust passage cover 34 is hollow inside, and a cylinder 36 having a diameter of, for example, 12 mm is formed on the top wall 2A of the heat insulating box 2 corresponding to the cool air exhaust passage cover 34.
A cold air discharge port 37 is formed so as to be penetrated through a portion and to connect the high pressure portion 7A of the cool air passage 7 and the inside of the cool air discharge passage cover 34 to each other. At the central portion of the rear surface of the cool air exhaust passage cover 34, a blower case portion 39 included in the cool air exhaust passage cover 34 is attached to the upper surface of the ceiling wall 2A. A humidifying blower 40, which is directed upward and is controlled by the control device 24, is housed and installed in the blower case 39, and a cool air discharge port 41 is provided in a corresponding position above the humidifying blower 40. The cool air discharge port 37 and the blower case 39
The cool air discharge path 42 is configured by the internal space of the cool air discharge path cover 34 including the cool air discharge port 41.

Next, the humidity adjusting operation of the low temperature showcase 1 having the above structure will be described. The humidity in the storage room 8 is detected by a humidity sensor 47 attached to the back of the top plate 4A. The output of the humidity sensor 47 is input to the control device 24, and assuming that the set humidity of the storage room 8 is 70%,
The controller 24 operates the humidifying blower 40 when the humidity of the storage chamber 8 drops to, for example, 68%. Blower for humidification 4
When 0 is operated, the air in the blower case 39 is sucked and discharged upward, so that the inside of the blower case 39 becomes a negative pressure, whereby the cold air in the high pressure portion 7A of the cool air passage 7 becomes two points in FIG. As shown by the chain line, it flows into the cool air discharge passage cover 34 through the cool air discharge port 37, and is forcibly discharged from the cool air discharge port 41 to the outside.

On the other hand, by forcibly discharging the cool air from the cool air passage 7, the inside of the storage chamber 8 communicating with the cool air passage 7 also becomes a negative pressure, so that the outside air becomes the filter 30 and the door 3 as shown by the broken line in FIG. After passing through the filter 30, the air flows into the door frame 27 through the outside air intake 28, and the outside air inlet 32
Is introduced into the storage room 8. Since the outside air contains a relatively large amount of moisture, the inside of the storage chamber 8 is humidified by introducing the outside air.

At this time, since the dust in the outside air which is about to flow into the outside air intake port 28 is removed in advance by the filter 30, the ingress of dust and bacteria from the outside air introduction port 32 is prevented. In particular, since the outside air intake port 28 is formed on the lower surface of the door frame 27 so as to face the upper surface of the door 3, dust is unlikely to accumulate on the filter 30.

Further, since the outside air intake 28 is opened at the front upper end of the low temperature showcase 1, the machine room 11 below is opened.
It does not draw in hot, low-humidity air that is exhausted backwards from. Further, the outside air introduction port 32 communicates with the outside only at the outside air intake port 28, and the cold air discharge port 37 is connected to the cold air discharge port 41.
It communicates only with the outside. In addition, the outside air intake 2
Reference numeral 8 indicates an opening on the lower surface of the front end of the door frame 27 at the front portion of the ceiling wall 2A, and the cool air discharge port 41 opens on the upper surface of the blower case portion 39 located at the rear portion of the cool air discharge passage cover 34 behind the door frame 27. Therefore, the cool air discharged from the cool air discharge port 41 does not directly reach the outside air intake port 28. Therefore, even if the outside air introduction port 32 and the cool air discharge port 37 are arranged side by side on the ceiling wall 2A, they are discharged from the cool air discharge port 37. The cold air with low humidity is stored in the storage chamber 8 directly from the outside air inlet 32 by a short circuit.
The humidification of the storage compartment 8 is effectively achieved without being introduced into it.

The storage chamber 8 is humidified by introducing the outside air.
When the internal humidity rises to 72%, for example, the control device 24 stops the humidifying blower 40. As a result, the outflow of cool air from the cool air discharge port 37 is also stopped, so that the introduction of outside air from the outside air introduction port 32 is also stopped. The inside of the storage chamber 8 is maintained at an average humidity of 70% by the above control.

In the embodiment, the present invention is applied to the low temperature showcase for indirectly cooling the storage chamber, but the invention is not limited to this.
The present invention is also effective in a system in which cold air from the evaporator is directly circulated in the storage chamber. Needless to say, the present invention can realize the same effect not only in the low temperature showcase of the embodiment but also in a refrigerator or the like.

[0027]

According to the first aspect of the invention, since the filter prevents dust from entering through the outside air inlet,
It is possible to prevent the storage room from becoming unsanitary. Since this dust removing filter is located above the door, it can be easily removed and cleaned. In particular, since the outside air intake is located on the lower surface of the door frame, dust is unlikely to be deposited on the filter, so that the risk of dust entering the storage chamber can be reduced, and the number of times the filter is cleaned can be reduced. Become. Further, since the outside air intake is located in the upper front part of the cooling storage, air of high temperature and low humidity around the rear part of the cooling storage is not introduced, so that the storage chamber is humidified smoothly and an unnecessary temperature rise inside is prevented. be able to.

According to the second aspect of the present invention, even if the outside air introduction port and the cold air discharge port are formed on the top wall of the heat insulating box, both are completely separated by the door frame and the cool air discharge passage cover. It is possible to prevent the occurrence of a short circuit between them. Furthermore, since the outside air intake is located in the front upper part of the cooling storage, the high temperature and low humidity air around the rear part of the cooling storage is not introduced as in the invention of claim 1, so that unnecessary temperature rise in the storage chamber is prevented. At the same time, the humidifying performance in the storage chamber can be improved as a whole.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a heat insulating box top wall portion of a low temperature showcase.

FIG. 2 is a perspective view of a low temperature showcase.

FIG. 3 is a vertical sectional view of a low temperature showcase.

FIG. 4 is a partially cutaway perspective view of a low temperature showcase.

FIG. 5 is a perspective view of the upper part of the heat insulating box of the low temperature showcase.

[Explanation of symbols]

 1 Low Temperature Showcase 2 Insulation Box 2A Top Wall 3 Door 4 Heat Random Wall 7 Cold Air Passage 8 Storage Room 16 Evaporator 17 Cold Air Circulation Blower 27 Door Frame 28 Outside Air Intake 30 Filter 32 Outside Air Inlet 34 Cold Air Outlet Cover 37 Cold Air Discharge Port 41 Cold Air Discharge Port 42 Cold Air Discharge Path

Claims (2)

[Claims] 1. A storage chamber and a cool air passage are defined inside a heat-insulating box having a door that can be opened and closed at a front opening, and the storage is performed by an evaporator and a cool air circulation blower disposed in the cool air passage. In a cooling storage for cooling a room, an internal hollow door frame extending from the upper surface of the heat insulating box top wall to above the door and a lower surface of the door frame corresponding to the upper surface of the door are An outside air intake that communicates the outside with the inside of the door frame, a filter that is detachably attached to the outside air intake, and the inside of the door frame that is formed on the top wall of the heat insulating box and communicates with the storage chamber. A cold storage comprising an outside air introduction port and a cold air discharge passage communicating the high pressure portion of the cold air passage with the outside. 2. A storage chamber and a cold air passage are defined inside a heat-insulating box having a door that can be opened and closed at a front opening, and the storage is performed by an evaporator and a cool air circulation blower disposed in the cold air passage. In a cooling storage for cooling a room, an internal hollow door frame extending from the upper surface of the heat insulating box top wall to above the door and a lower surface of the door frame corresponding to the upper surface of the door are An outside air inlet communicating between the outside and the inside of the door frame, an outside air inlet formed in the top wall of the heat insulating box to communicate between the inside of the door frame and the storage chamber, and the top of the heat insulating box behind the door frame. An inner hollow cold air exhaust passage cover attached to the upper surface of the wall, a cold air exhaust port formed in the cold air exhaust passage cover to connect the outside and the inside of the cool air exhaust passage cover, and formed in the heat insulating box top wall. Discharge of the cold air A cold storage comprising a cold air discharge port that communicates the inside of the road cover with the high pressure portion of the cold air passage.