JP2925663B2 - freezer - Google Patents

Description

The present invention relates to a freezer that cools a storage room to a freezing temperature.

(B) Conventional technology Conventionally, in a freezer of this type, since the storage room is cooled to a low temperature of −20 ° C. to −80 ° C. or lower by a refrigerating device, the refrigerator that enters the storage room when the door is opened or the like. The outside warm air shrinks and is dehumidified. Therefore, the pressure in the storage chamber decreases, and the inside of the storage door sandwiching it becomes negative pressure from the outside, so that a large force must be applied to open the insulation door.

Therefore, conventionally, as in JP-A-53-67956, the inside and the outside of the door are communicated with a through hole, and this through hole can be opened and closed by a valve and opened when the door is opened, and the pressure difference between the inside and outside of the door is reduced. (C) Problems to be solved by the invention In such a conventional structure, since the through hole is closed only by the valve head, the heat insulating performance of the door in the through hole portion is provided. Is significantly reduced. Therefore, there is a problem that a desired cooling effect cannot be exhibited if the storage chamber is cooled to an extremely low temperature such as -80 ° C.

In addition, since such a valve mechanism protrudes from the front surface of the door and is exposed, there is a problem in that it is not preferable in appearance and it is difficult to operate.

The present invention has been made to solve such a problem.

(D) Means for Solving the Problems The present invention provides a heat insulating door which has a gasket on the back surface which is in close contact with the opening edge of the heat insulating box and hermetically seals, and which is rotatably supported on one side; A ventilation hole communicating with a side surface of the heat-insulating door outside the storage space with a gasket as a boundary, a through-hole opening inside the heat-insulating door, and the ventilation hole and the through-hole provided in the heat-insulating door on the back side of the gasket. A heat insulating material of open cells that communicates between the outside of the refrigerator and the inside of the heat insulating door, and a dew-prevention heater near the air holes are provided, and the heat insulating material of the air holes, the air holes, and the open cells is provided, The configuration is such that outside air enters due to a negative pressure due to cooling inside the heat insulating door, and air inside the heat insulating door escapes due to blockage of the heat insulating door.

In addition, in addition to the above, the heat-insulating door is provided with a handle for opening and closing the heat-insulating door, and a portion of the substrate of the handle is provided with a portion for concealing the ventilation hole at a position slightly apart. It is.

Furthermore, a heat insulating door which has a gasket on the back surface which is in close contact with the opening edge of the heat insulating box and hermetically seals and which is pivotally supported on one side is pivotally supported. A handle portion having a handle rotatably supported on the front side of the handle, a ventilation hole formed in the substrate behind the handle and communicating with the outside of the heat insulating door, and a rear portion of the handle portion And a through-hole opened inside the heat-insulating door, and inside the gasket and behind the handle portion, provided in the heat-insulating door, the outside of the refrigerator and the inside of the heat-insulating door together with the vent and the through-hole. And a lid for opening and closing the ventilation hole with the opening and closing of the heat insulation door in conjunction with the rotation of the handle, and the opening of the lid for the ventilation hole, The outside air enters through the heat insulating material of the open cells and the through holes. .

(E) Function According to the present invention, since the inside of the heat insulating box communicates with the outside of the heat insulating box through the heat insulating material in the ventilation portion, the pressure difference between the inside and outside of the heat insulating door is eliminated. Further, the heat insulating performance of the door in the ventilation portion is achieved by the open-cell heat insulating material.

In addition, if the ventilation part is concealed by the handle, the ventilation part is not exposed to the outer surface of the door, and the problem in appearance is solved.

Furthermore, if the lid opens and closes the ventilation portion in conjunction with the movable handle of the handle portion, the leakage of the cool air passing through the bubbles of the heat insulating material is prevented, and the operation is simplified.

(F) Example Next, an example will be described with reference to the drawings. FIG. 1 is a perspective view of a freezer 1 to which the present invention is applied, and FIG.
The sectional view of the heat insulation door 3 of a part is shown.

The front opening of the heat-insulating box 4 is openably and closably closed by the above-mentioned heat-insulating door 3 pivotally supported on one side.
A handle 2 for opening and closing the heat insulating door 3 is attached to a central portion of the non-pivot side of the heat insulating door 3.

In FIG. 2, the heat insulating door 3 has a front surface 5A, a side surface 5B and a rear surface.
An insulating material 7 made of foamed polyurethane is filled between a metal outer plate 5 having 5C and a synthetic resin inner plate 6 screwed to the rear surface 5C. Reference numeral 8 denotes a gasket sandwiched between the inner plate 6 and the rear surface 5C. The gasket 8 comes into close contact with the opening edge of the heat insulating box 4 and hermetically seals it with the heat insulating door 3 closed.

Reference numeral 9 denotes a synthetic resin substrate constituting the handle portion 2, which has a concave front surface, has a handle 10 for hanging a finger inside, and is formed over the front surface 5A and the side surface 5B of the outer plate 5. Engaged with the cutout 11.

A vent hole 12 is formed in the side surface 5B of the outer plate 5, and a side of the substrate 9 of the handle portion 2 is slightly spaced apart from the side of the vent hole 12.
9A is located and concealed. The side 9A forms a groove 13 that opens rearward between the side 9A and the side surface 5B of the outer plate 5, and the groove 13 allows the ventilation hole 12 to communicate with the outside of the refrigerator.

On the other hand, a through hole 14 is also formed in the inner plate 6, and this through hole 14 is formed.
Heat insulating materials 15 and 16 made of, for example, maltoprene are provided in the heat insulating door 3 between the hole 14 and the ventilation hole 12. Insulation material 15 and
Reference numeral 16 denotes an open-cell structure, whereby the ventilation portion 12 and the inside of the heat-insulating door 3 communicate with each other, and the heat-insulating materials 15 and 16 heat-insulate the heat-insulating door 3 in this portion.

Reference numeral 17 denotes an inner door for double closing the storage room 18 of the heat insulating door 3, and abuts on the step 19 of the heat insulating box 4.

Since the inside of the storage room 3 is cooled to a very low temperature of −80 ° C. or less by a refrigerator (not shown), the space between the inner door 17 and the heat insulating door 3 has a considerably low temperature even when the inner door 17 is closed.
For this reason, the warm air outside the warehouse that enters when the heat insulating door 3 is opened is rapidly cooled and contracts, so that a negative pressure is generated between the inner door 17 and the heat insulating door 3. Then, the outside air flows from the ventilation hole 12 to the heat insulating material 1
Enter through 5, 16 and equilibrate this pressure with atmospheric pressure. Therefore, a large force is not required when opening the heat insulating door 3 next time.

Conversely, when the heat insulating door 3 is closed, the air sandwiched between the inner door 17 and the heat insulating door 3 escapes from the ventilation hole 12 so that the door is easily closed.

Reference numeral 20 denotes a heater provided to prevent the heat-insulating door 3 from dewing. Even if cool air flows out through the air hole 12 after the pressure is balanced, the heater 20 will not remove the air near the air hole 12. There is no problem because sticking is prevented.

Next, FIG. 3 shows another structure of the handle portion (hereinafter, referred to as 21) and the heat insulating door (hereinafter, referred to as 22). Note that the same reference numerals in FIG. In this case, the skin
24 does not have the aforementioned ventilation holes 12, but instead has a handle
A ventilation hole 26 is formed in the substrate 25 of the substrate 21. The handle 27 of the handle 21 is rotatable around a shaft 28 at a predetermined angle. Reference numeral 29 denotes a lid rotatably attached to the substrate 25 so as to open and close the ventilation hole 26, and is engaged with the handle 27 so that the ventilation hole 26 can be opened and closed in conjunction with the handle 27.

A communication member 30 is embedded in the heat insulating material 7 at the rear side of the ventilation hole 26, and a through hole is formed in the inner plate 31 corresponding to the rear of the communication member 30.
32 are drilled. Between the through hole 32 and the communication member 30, a similar open-cell heat insulating material 33 made of maltoprene is located.

The operation will be described. The lid 29 always closes the ventilation hole 26 so that the handle 21 covers the ventilation hole 26.
Next, when a finger is put on the handle 27 to open the heat insulating door 22, the handle 27 rotates. This allows the lid 29 to vent
Since the opening 26 is opened, the ventilation enters between the inner door 17 and the heat insulating door 22 through the communication member 30 and the heat insulating material 33. Thereby, the inner door
Since the air pressure between 17 and the insulated door 22 is balanced with the atmospheric pressure, the insulated door
22 will be easy to open.

In this case, since the lid 29 always closes the ventilation hole 26, there is no leakage of cool air, and since the opening of the lid 29 is performed in conjunction with the operation of the handle 27, the operation is very easy. .

(G) Effects of the Invention According to the present invention, in the first invention, the inside of the heat insulating box is communicated with the outside of the heat insulating box via the open-cell heat insulating material in the ventilation portion, so that the pressure difference between the inside and outside of the heat insulating door is eliminated. This makes it extremely easy to open and close the heat-insulating door, and also prevents dust from entering the interior due to ventilation. In addition, since the ventilation hole and the ventilation hole are arranged with the gasket as a boundary, the ventilation portion can be provided on the side surface of the outside of the door of the door, and the ventilation portion can also be provided on the outside in comparison with the case where the ventilation hole is provided in front of the door. It is not necessary to provide any special parts for decorating the door, and as in the embodiment, it can be provided behind the handle arranged at the end of the door, and the structure for incorporating the open-cell heat insulating material can be easily formed. it can. Ventilation holes and through holes are arranged with the gasket as a boundary, but in this case also, the passage between the ventilation holes and through holes is filled with open-cell abandonment material, which reduces the heat insulating effect. The heat insulation performance at the back of the gasket can be easily ensured, so that an excellent freezer that does not adversely affect the cooling performance can be achieved, and can sufficiently cope with a low-temperature freezer at −80 degrees Celsius. Furthermore, since the vicinity of the ventilation holes can be prevented from being dewed by the heater, even if outside air naturally enters due to the generation of a negative pressure due to the cooling inside the insulated door when the door is closed, freezing occurs due to dew formation. Thus, the ventilation holes are not blocked, and the heat of the heater and the influence of the open-cell heat insulating material on the inside of the refrigerator can be prevented.

In the second invention, in addition to the above-described effects of the first invention, the ventilation part is hidden by a part of the substrate of the handle without providing a special part for decorating the ventilation part. In addition, the ventilation portion is not exposed on the outer surface of the door, and a preferable configuration in appearance can be achieved. .

Furthermore, in the third invention, a door can be provided which can be provided behind the handle portion arranged at the end of the door, and can easily form the structure for incorporating the open-cell heat insulating material. The appearance is good because it is hidden by. In addition, the rotation of the handle allows the inside of the heat insulating box to communicate with the outside of the heat insulating box through the open-cell heat insulating material in the ventilation part, so that the pressure difference between the inside and outside of the heat insulating door is eliminated, making it extremely easy to open and close the heat insulating door. At the same time, it is possible to prevent dust from entering the storage chamber due to ventilation with the open-cell heat insulating material. Also, the passage between the vent and the through hole is filled with open-cell insulation.
The insulation performance inside the gasket of the door can be ensured, and it can sufficiently cope with a low-temperature freezer of -80 degrees Celsius.

[Brief description of the drawings]

FIG. 1 is a perspective view of a freezer, FIG. 2 is a sectional view of a heat insulating door of a handle portion, and FIG. 3 is a cross sectional view of a handle portion of another heat insulating door. 1, freezer, 2, 21, handle part, 3, 22, insulated door,
4… Insulated box, 12… Vent, 15, 16, 33… Insulated material, 27… Handle, 29… Lid.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 53-67956 (JP, U) Japanese Utility Model Showa 51-39867 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F25D 23/00-23/02

Claims (3)

(57) [Claims] 1. A heat-insulating door having a gasket on the back surface which is in close contact with the opening edge of the heat-insulating box and hermetically sealed, and which is pivotally supported on one side so as to be freely rotatable, and a housing for the heat-insulating door with the gasket as a boundary. A vent hole communicating with an outer side surface and a through hole opening inside the heat insulating door; and a gas hole provided inside the heat insulating door on the back side of the gasket, the vent hole and the through hole being outside the warehouse and inside the heat insulating door. And a heater for preventing dew from be present in the vicinity of the air hole, and a negative pressure caused by cooling the inside of the heat insulating door through the heat insulating material of the air hole, the air hole, and the open cell. A freezer having a configuration in which the outside air enters along with the above and the inside of the heat insulating door escapes with the closing of the heat insulating door. 2. The heat-insulating door is provided with a handle for opening and closing the heat-insulating door, and a part of the substrate of the handle is provided with a portion for concealing the ventilation hole at a position slightly apart. The freezer according to claim 1, wherein 3. A heat-insulating door having a gasket on the back surface which is in close contact with the opening edge of the heat-insulating box and hermetically sealed, and one side of which is rotatably pivotally supported, and a substrate provided outside the warehouse of the heat-insulating door. A handle portion having a handle rotatably supported on the front side of the board; a vent hole provided in the board behind the handle and communicating with the outside of the heat insulating door; A through-hole opened inside the heat-insulating door at the rear of the portion, and the heat-insulating door provided inside the gasket and at the back of the handle portion in the heat-insulating door together with the vent and the through-hole. Provide an open-cell insulation material that communicates with the inside of the door,
A lid is provided for opening and closing the ventilation hole in conjunction with the opening and closing of the heat insulating door in conjunction with the rotation of the handle, and when the lid is opened, the outside air passes through the ventilation hole, the insulating material for the open cell, and the through hole. Freezer characterized by entering.