JP3398326B2 - Door seal structure for cooling storage - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal structure for a door portion in a cold storage.

[0002]

2. Description of the Related Art Conventional door seal structures of this type are:
The one shown in FIG. 7 is known. That is, a door c is swingably opened / closed at an entrance / exit b opened on the front surface of a main body a of the cooling storage, and a packing e is attached to an inner surface of a flange portion d formed at a peripheral edge of the door c. On the other hand, a heater plate g equipped with a heater f on the back side is attached to the edge of the doorway b, and the packing e is elastically deformed and closely adhered to the heater plate g when the door c is closed. The seal is designed to be removed. In addition, the packing f is heated by the heater f to prevent freezing. Here, in the conventional one, the protrusion h is formed on the surface of the heater plate g so as to enhance the sealing property, and the protrusion h is made to bite into the surface of the packing e.

[0003]

However, in the conventional structure, when the inside of the refrigerator is cooled to a low temperature of, for example, −30 ° C. or less, the packing e is hardened by receiving the cold heat.
It contracts and a gap is created in the part where the protrusion h bites,
There was a risk that cold air would leak outside the store. The mounting structure of the heater f and the heater plate g is shown in detail in FIG. That is, a mounting groove i is formed at the edge of the entrance / exit b, and two housing grooves j are formed on the bottom surface thereof. After the heater f is housed in the housing groove j, the heater plate g is mounted on the mounting groove i. Fit on heater f
Covers. In this structure, there are variations in the diameter of the heater f. For example, if the diameter of the heater f is small, heat cannot be transferred well because the heater f cannot adhere to the back surface of the heater plate g, and conversely the diameter of the heater f is large. Then, the heater plate g may be floated, and in an extreme case, the heater plate g may come off. Further, as the inside of the refrigerator is cooled to a lower temperature, the capacity of the heater f is increased, but in consideration of the case where the door c is opened and the heater plate g is exposed, the heater plate g is excessive. It was also necessary to take measures to prevent heating.

The present invention was completed in view of the above circumstances, and an object thereof is to improve the sealing property of packing. Another purpose is to improve the adhesion of the heater to the heater plate. Still another object is to prevent overheating of the heater plate.

[0005]

According to a first aspect of the present invention, there is provided a door seal structure for a cold storage, wherein a door is provided at an opening / closing opening of the storage main body so that the door can be opened and closed. in what is packing seals in contact with the opening edge of the entrance opening, when the the surface of the contact portion of the packing are formed concave groove along the length direction DOO
By the way, the surface of the doorway where the packing abuts
In order to hit both edges of the groove and press them,
The feature is that it has a curved surface shape that gradually bulges toward the center . According to a second aspect of the present invention, in the first aspect of the invention, between the abutting portion and the back surface portion of the packing,
It is characterized in that the partition wall is formed at a position offset from the groove and offset from the center of the contact portion in the width direction. The invention of claim 3 relates to claim 1 or claim 2.
The invention is characterized in that raised portions are formed at both ends in the width direction on the surface of the abutting portion of the packing.

The invention of claim 4 is characterized in that, in the invention of claim 1, claim 2 or claim 3, ridges are formed at both ends in the width direction on the surface of the abutting part of the packing. Have. The invention of claim 5 is characterized in that, in the invention of claim 4, the heater plate is mounted in a state in which a part of the heater plate is in contact with a panel on the outside of the storage that constitutes the storage main body.

[0007]

<Advantages and Effects of the Invention><Invention of Claim 1> When the door is closed, the bulging curved contact surface on the entrance / exit side is pressed against the edge of the concave groove provided in the contact portion of the packing. As a result, a bending force is applied to the outer part of the groove in the direction of approaching the contact surface, which causes the contact part of the packing to closely adhere so as to wrap around the curved contact surface, improving the sealing performance. To be done. <Invention of Claim 2> The partition wall functions to further press the outer surface of the concave groove against the contact surface without hindering the bending force from acting on the outer surface of the groove, thereby further improving the sealing performance. You can <Invention of Claim 3> By providing the raised portions at both ends, the abutting portion of the packing can be abutted over the entire width so as to wrap the abutting surface, and the air chamber can be provided between the packing and the abutting surface. Is configured to enhance the heat insulating effect inside and outside.

<Invention of Claim 4> Even if there are variations in the diameter of the heater, etc., the heater can always be placed in close contact with the back surface of the heater plate, and the heat of the heater can be efficiently applied to the heater plate and thus to the packing. Can be communicated. <Invention of Claim 5> It is possible to prevent a part of heat of the heater plate from being radiated toward the panel on the outer side of the refrigerator, so that the heater plate is not excessively heated.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. <First Embodiment> A first embodiment of the present invention will be described with reference to FIGS. 1 and 2, reference numeral 1
Is a freezer body composed of a heat-insulating box, and is formed in a rectangular box shape having an opening 2 on the front surface. In detail, inside the outer box 3 opened to the front, the inner box 4 also opened to the front.
Are housed with a space therebetween, and a frame 5 is formed to form an entrance / exit 2 between the opening edges of both boxes 3 and 4, and a heat insulating material 6 such as urethane foam resin is filled between the boxes 3 and 4. Is formed. A door 7 is provided at the doorway 2 of the freezer body 1.
Is attached by a hinge 8 so as to swing and open. Since the door frame 11 is connected between the opening portions of the inner panel 9 and the outer panel 10, the door 7 has the flange portion 1 on the outer peripheral edge of the thick body portion 12 as a whole.
3 has a shape in which it is provided over the entire circumference and has a heat insulating structure in which a heat insulating material 6 such as urethane foam resin is also filled.

A packing 15 is provided between the doorway 2 of the freezer main body 1 and the door 7. As shown in FIG. 3, the packing 15 is formed into a hollow shape having a substantially rectangular cross section. The packing 15 has an abutment portion 16 on the upper surface side thereof, and a locking portion 18 from the rear surface portion 17 on the lower surface side. Is projected. On the surface of the abutting portion 16 of the packing 15, concave grooves 20A to 20C having a triangular cross section are formed along the length direction at three positions on the center in the width direction and on both sides thereof. Inside the packing 15, each groove 20A to
A partition wall 21 is formed so as to connect the contact portion 16 and the back surface portion 17 at a position between 20C, and three air chambers 22 are formed for convenience. Further, ridges 23A and 23B are formed on both ends of the surface of the contact portion 16 along the length direction. A fin portion 24 having a bifurcated tip is formed to extend from the side surface of the raised portion 23A (inside the refrigerator).

The flange portion 13 of the door frame 11
A packing mounting groove 26 is formed in a portion forming the inner surface of the above, and a locking groove 27 is further formed in the bottom surface thereof.
A door cushion 28 is attached to a corner portion where the side surface of the main body portion 12 and the inner surface of the flange portion 13 are connected. Then, the packing 15 attaches the engaging portion 18 to the engaging groove 27.
While being inserted into the packing fitting groove 26, the abutting portion 16 of the packing 15 at this time protrudes slightly from the inner surface of the flange portion 13, and the fin portion 24 serves as the fin cushion 24.
It passes through the surface of 8 and contacts the side surface of the main body 12.
On the other hand, on the entrance / exit 2 side, the surface of the frame 5 that constitutes the front edge of the entrance / exit 2 is the mounting surface 31 of the heater plate 40, and as shown in FIG. Has a step 50. A heater mounting groove 32 is formed on the mounting surface 31, and the heater mounting groove 32 has a cross-sectional shape in which the entrance 33 is narrowed and the inner side is widened. A heater 30 for freeze prevention and a heater cushion 35 (described later) are accommodated in the heater mounting groove 32, and the heater plate 40 is fitted into the heater mounting groove 32 and mounted on the mounting surface 31. .

The heater plate 40 is formed in the cross-sectional shape shown in FIG. 4, and the front surface side (the lower surface side in the figure) serves as the contact surface 41 with which the contact portion 16 of the packing 15 is contacted. In addition, a pair of insertion legs 42 are formed on the back surface side with a predetermined space. The abutting surface 41 is formed in a curved surface shape that gradually bulges toward the center position of the width region where the abutting portion 16 of the packing 15 abuts, and both outer sides thereof are flat surfaces. The raised portions 23A and 23B of the packing 15 are set so as to contact both ends of the curved surface portion 43 that has come out. Further, one end side (the inside of the refrigerator) in the width direction of the heater plate 40 has an inclined surface 5A formed at a corner of the frame 5.
The extending portion 44 is formed obliquely so as to be continuous with (FIG. 1) and extends outward on the other end side (outside of the refrigerator).
Are formed.

The above-mentioned heater cushion 35 is formed of a material having excellent heat resistance and elasticity such as silicone rubber, and as shown in FIG. The shape is such that the narrow portion 37 is formed in the central portion, and the entire thickness is equal to the depth of the heater mounting groove 32. An accommodation groove 38 for accommodating the heater 30 is formed at the center of the surface of the narrow portion 37, and the depth thereof is set to be slightly smaller than the diameter of the heater 30. In addition, a relief recess 39 is formed at the center of the back surface of the wide portion 36.
Are formed.

The assembly procedure is as follows. First, the heater cushion 35 is housed in the heater mounting groove 32. At this time, the insertion leg 4 of the heater plate 40 is provided between the heater cushion 35 and the inner surface of the heater mounting groove 32.
Two insertion spaces are formed, and the surface of the narrow portion 37 of the heater cushion 35 is flush with the entrance 33 of the heater mounting groove 32. Next, the heater 30 is housed in the housing groove 38 of the heater cushion 35, and the heater 30 is stored in a natural state.
A part of the protrusion protrudes forward of the mounting surface 31, that is, a pressing margin is provided. Finally, the heater plate 4
0 is attached. In this case, the two insertion legs 42 are inserted into the entrance 33 and are locked to the side edges on the back side of the entrance 33 to be fitted in the retaining state, and the back surface of the heater plate 40 is brought into close contact with the mounting surface 31. Along with this, the portion of the heater cushion 35 in which the accommodation groove 38 is provided is released and elastically deformed toward the recess 39 side to escape, and the heater 30 is pushed in, and due to its restoring elasticity, the heater 30 is in close contact with the back surface of the heater plate 40 without difficulty. Held in a state.
Further, the extension portion 44 of the heater plate 40 on the outer side of the refrigerator projects so as to cover the front of the opening edge of the outer box 3 constituting the freezer main body 1. Then, the extending portion 44 of the heater plate 40
And caulking 46 of silicone rubber or the like is applied to a gap between the outer casing 3 and the outer casing 3.

This embodiment has the above-mentioned structure,
Next, the operation will be described. Door 7 from the state shown in FIG.
When is closed, the contact portion 16 of the packing 15 is applied to the contact surface 41 of the heater plate 40 as shown in FIG. The operation mode at that time will be described with reference to FIG. First, the vicinity of the central groove 20B in the contact portion 16 of the packing 15 is pressed against the most bulged portion of the curved surface portion 43 of the heater plate 40, and the center portion of the contact portion 16 bends the partition wall 21. Pushed in. At the same time, both edges of the central groove 20B are pushed by the heater plate 40, so that the contact portions 25A and 25B on both sides of the groove 20B receive a bending force in a direction approaching the curved surface portion 43, and the partition wall 21
Both contact portions 25A and 25B are curved by the restoring elasticity of
Pressed on 3. When the packing 15 further approaches the heater plate 40 side, the inner edges of the recessed grooves 20A at both ends are pressed by the heater plate 40 and a pressing force directed toward the center side of the packing 15 is received.
The raised portions 23A and 23B at both ends of 5 receive a bending force in a direction of approaching the curved surface portion 43, and the raised portions 23A and 23B are pressed against both ends of the curved surface portion 43. This allows packing 15
The contact portion 16 of is adhered so as to wrap around the contact surface 41 of the heater plate 40. At this time, the central groove 20B
, The concave grooves 20A, 20C on both sides to the raised portion 23A,
The air chamber 48 is formed by the space up to 23B.

Further, as the door 7 is closed, the door cushion 28 presses the base end side of the fin portion 24 of the packing 15 against the inner end portion of the heater plate 40, and the bifurcated tip closely contacts the side surface of the main body portion 12. To do. As a result, packing 1
It is possible to avoid the cold air in the refrigerator from directly contacting the abutting portion 16 of No. 5, and an air chamber 49 is formed between the fin portion 24 and the inner panel 9 to exert a heat insulating function. On the other hand, since the heater 30 is elastically pressed against the back surface of the heater plate 40 via the heater cushion 35, the heat of the heater 30 is efficiently transmitted to the heater plate 40 and thus the packing 15. Further, the extension portion 44 of the heater plate 40 on the outer side of the refrigerator is provided with the outer box 3 of the freezer body 1 via the caulking 46.
The excess heat of the heater plate 40 is released to the outer box 3 side while being in contact with the opening edge of the.

As described above, according to this embodiment,
The following advantages can be obtained. The abutting portion 16 of the packing 15 wraps the abutting surface 41 of the heater plate 40 and is brought into close contact with it over a wide area, and the restoring elasticity of the partition wall 21 firmly presses the contact portions 25A and 25B. Can be improved. The abutting portion 16 of the packing 15 is hard to be cooled by the cold air inside the chamber due to the air chamber 49 or the like formed by the fin portion 24, and the heater plate 40 side is provided with a protrusion that bites in the conventional manner. Since there is no packing 1
It is possible to prevent breakage and the like from occurring in 5, and to improve its durability. In addition, three air chambers 48 are formed between the abutting portion 16 of the packing 15 and the heater plate 40, and function to insulate the inside and outside of the packing 15, so that the air chamber 22 inside the packing 15 is combined. It is effective in reducing heat loss in the refrigerator.

Further, the heater 30 is the heater cushion 3
The structure is such that it is pressed against the back surface of the heater plate 40 via 5, and the heater 30 is held in close contact with the back surface of the heater plate 40 without exerting an unreasonable force such as floating the heater plate 40. The heat of the heater 30 can be efficiently transmitted to the heater plate 40 and thus the packing 15, so that the packing 15 can be prevented from being frozen. On the other hand, the extension part 44 on the outer side of the heater plate 40 is brought into contact with the opening edge of the outer box 3 of the freezer main body 1 via the caulking 46 so that excess heat of the heater plate 40 is released to the outer box 3 side. Therefore, it is convenient to handle when the door 7 is opened. Even if cold air leaks from the packing 15, the outer case 3 is still warmed,
Dew does not easily form.

<Second Embodiment> FIG. 6 shows a second embodiment of the present invention. In the second embodiment, the heater plate 4
Changes have been made to the 0A structure. That is, on the back surface of the end portion of the heater plate 40A on the outer side of the refrigerator, the close contact portion 5 is formed so as to fill the step 50 between the mounting surface 31 and the outer box 3.
1 is formed to project. The other structure is the same as that of the first embodiment, and the portions having the same functions are designated by the same reference numerals and the duplicated description will be omitted.

In the second embodiment, the heater plate 4
The close contact portion 51 provided at the end portion of the outer side of 0A directly comes into close contact with the outer box 3, whereby excess heat of the heater plate 40A is released to the outer box 3 side. In addition to the advantages of the first embodiment, the heater plate 40A can be positioned using the contact portion 51 and the step 50, and the advantage that the caulking can be eliminated and the workability can be improved is obtained.

<Other Embodiments> The present invention is not limited to the embodiments described above and illustrated in the drawings. For example, the following embodiments are also included in the technical scope of the present invention. In addition to the above, various modifications can be made without departing from the scope of the invention. (1) The seal structure according to the present invention is more effective when the inside of the refrigerator has a lower temperature like a freezer, but can be similarly applied to a door seal structure of a general cold storage.

[Brief description of drawings]

FIG. 1 is a sectional view showing a door seal structure according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the door when it is opened.

FIG. 3 is a sectional view of the packing.

FIG. 4 is a sectional view of a heater plate

FIG. 5 is an enlarged cross-sectional view showing a seal portion in detail.

FIG. 6 is an enlarged cross-sectional view of the seal structure according to the second embodiment.

FIG. 7 is a sectional view of a conventional door seal structure.

FIG. 8 is an enlarged sectional view showing a mounting portion of the heater.

[Explanation of symbols]

1 ... Freezer main body 2 ... Doorway 3 ... Outer box 7 ... Door 1
5 ... Packing 16 ... Abutting part 17 ... Back part 20A-
20C ... Recessed groove 21 ... Partition wall 23A, 23B ... Raised part 25A, 25B ... Contact part 30 ... Heater 32 ... Heater mounting groove 35 ... Heater cushion 40 ... Heater plate 41 ... Contact surface 43 ... Curved part 44 ... Extension part Four
6 ... Caulking 40A ... Heater plate 51 ... Adhesion part

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-9-145232 (JP, A) Actual opening Sho 56-54781 (JP, U) Actual opening Sho 63-125776 (JP, U) Actual opening 43- 31774 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) F25D 23/02 305

Claims (5)

(57) [Claims] 1. A door, which is openably and closably provided at a doorway opened to a storage main body, and a hollow packing attached to a peripheral edge of the door abuts and seals a rim of the doorway. A groove along the length direction is formed on the surface of the abutting part of the packing, and the packing at the entrance and exit
The contact surface of the groove contacts both edges of the groove.
Curved surface that gradually bulges toward the center of the width to press
A door storage structure for a cooling storage, which is characterized by being shaped . 2. A partition wall is formed between the contact portion and the back surface portion of the packing at a position displaced from the groove and at a position displaced from the center of the contact portion in the width direction. The door seal structure for a cold store according to claim 1, wherein: 3. The door seal structure for a cooling storage according to claim 1, wherein raised portions are formed at both ends in the width direction on the surface of the abutting portion of the packing. 4. A mounting groove for mounting a heater is formed on an edge of the entrance and exit, and a heater plate is provided to cover the mounting groove, and a surface of the heater plate is a surface with which the packing abuts. And in the mounting groove,
The door seal structure of the cooling storage according to claim 1, wherein a cushion that elastically presses the heater on the back surface of the heater plate is mounted. 5. The door seal structure for a cooling storage cabinet according to claim 4, wherein the heater plate is mounted such that a part of the heater plate is in contact with a panel on the outside of the cabinet forming the storage cabinet body.