JPH02103382A - Heat insulated cabinet - Google Patents

Abstract

PURPOSE:To improve the attachment strength of a reinforcement member and prevent the leakage of foam insulating material by fixedly attaching the reinforcement member to the rear of a double flange formed at the rim of the front opening of the outer casing which is formed by bending a painted sheet metal strip by means of the one-sided spot welding, and forming a fitting section in the inner casing flange to which the double flange is fitted. CONSTITUTION:The cabinet 22 which forms the outer casing 23 of a refrigerator has a double flange 27 at the rim of the front opening, said flange being formed by bending a painted sheet metal strip. A reinforcement member 34 made of steel plate has a vertical side 34a and a horizontal side 34b which are fixedly attached to the rear of the rear flange 27c at the front left corner of the cabinet 22 by means of the one-sided spot welding, and it also has a rearwardly extending hinge attachment section 34c. The fitting part 37b which is a rib formed on the inner casing flange 37a is fitted to a groove 33 formed in the flange 27. This way, the attachment of the reinforcement member 34 to the outer casing 23 can be facilitated, ensuring its attachment strength. Further, by simplifying the connection of the inner casing flange 37a and the outer casing 23, the leakage of foam insulating material 8 can be prevented.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to an insulating box body for a refrigerator or the like, which has an outer box formed by bending a painted steel plate and a foam insulation material filled between the inner box and the inner box. .

Conventional technology The conventional example is explained based on FIGS. 10 to 16. 1
is an insulated box body, and the outer box 2 is made of pre-painted steel plate.
It consists of an inner box 3 molded from resin and a foamed heat insulating material 4 filled between the two boxes 2 and 3. A freezer compartment door 8 and a refrigerating compartment door 9 are attached to the front opening of the heat insulating box 1 and are pivotally connected by upper, middle and lower hinges 5, 6.7 so as to be openable and closable. The upper hinge 6 has a screw 10 as shown in FIG.
It is tightened and fixed. Conventionally, the internal structure of the refrigerator body 1 to which the upper hinge 6 is fixed is disclosed in Japanese Patent Publication No. 55-1, for example.
As shown in Japanese Patent No. 5031, the configuration was as shown in FIG.

That is, the hinge mounting plate 11 is fixed to the outer case 2 using rivets 12 because the outer case 2 is a painted steel plate and cannot be subjected to ordinary electric welding. Then screw 1 to the hinge mounting plate 11.
0 to fix the upper hinge 5.

Further, the structure of the outer box 2 and inner box 3 constituting the heat insulating box 1 is as shown in FIGS. 13 to 16, for example, as shown in Japanese Patent Laid-Open No. 138874/1983.

In other words, 13 is the cabinet that forms the outer box 2 of the refrigerated rhinoceros.
The left side plate 14, the right side plate 16, the top plate 16, and a double flange 17 formed at the edge of the front opening are formed by bending a single strip-shaped painted steel plate that has been previously painted.

The double flange 17 is formed by bending the left and right side plates 14, 15 and the top plate 16 to form a front flange 17a and this front flange 17.
A back flange 17b1 that is continuous with the back flange 17b and folded back at a slight distance to the back side of the front flange 17a.
and a rear flange 17c forming a groove 18 therebetween. The rear flange 170 has a notch 19 formed at the left and right corners of the front surface that extends diagonally downward to the opening end of the groove 18 at an angle of approximately 46 degrees, and rectangular notches 19 are formed on the vertical and horizontal sides of the rear flange 17c, respectively. A locking hole 20 is formed. Reference numeral 21 denotes a reinforcing member, which has a two-sided shape with a vertical side 21a inserted into the groove 18 and a horizontal side 21b at the left and right corners of the front surface of the cabinet 13, and has a reinforcing member at a part of the corner so as to fit into the notch 19. Retention part 21o formed by depression
At the tips of the vertical side 21a and the horizontal side 21b, locking portions 21d are formed which are bent rearward and inserted and locked into the locking holes 20 and 20, respectively.

As mentioned above, the inner box 3 is combined with the inner box 3 while maintaining a space with respect to the cabinet 13, which has been combined with the reinforcing member 21 and whose corners have been partially reinforced, and a foamed insulation material 4 is placed between the two boxes using an in-situ foaming method. is foamed and filled to form a heat insulating box 1. Since the inner box 3 has an inner box flange 3a formed on the front opening edge, this inner box flange 3a is inserted between the back flange 17b and the rear flange 17c in the groove 18, thereby preventing the foam insulation material 4 from leaking to the outside. It is prevented.

Problem to be Solved by the Invention However, in the above configuration, it is difficult to rivet the hinge mounting plate 11 as shown in FIG. There was a problem that it was easy to become unstable and cause positional deviation. In addition, in the structure of the outer box 2 shown in FIGS.
Since the locking part 21d is inserted and locked into the reinforcing member 21 and the notch 19 of the cabinet 13 and the locking hole 2, the insertion work is difficult and tends to be uncertain.
Due to dimensional variations due to the machining of the parts of 0, looseness may occur at the fitting and locking parts, resulting in the cabinet 13 not being square, and the 7 corners of the front flange 17 opening, resulting in an unfavorable appearance. Furthermore, when food is put into the freezer door 8, force is applied to the upper hinge 6, causing the corners of the heat insulating box 1 to deform.

Regarding the fitting between the inner box flange 3a and the groove 18, since the reinforcing member 21 is inserted into the groove 18 at a part of the corner of the outer box 2, the inner box flange 3a is inserted into the groove 18.
Since the width dimension of the inner box flange 3a becomes narrower than other parts, the fitting dimension of the inner box flange 3a has to be changed, and the fitting with the groove 18 becomes loose, and the locking hole 2o is opened in the rear flange 17o. , a retaining portion 2 is depressed in a part of the corner of the reinforcing plate 21.
1c, and a gap is created between the inner box flange 3a and the foamed insulation material 4 leaks slightly to the outside, causing a problem in appearance, and it is extremely difficult to remove the leaked foamed insulation material 4. There were such issues.

In view of the above-mentioned problems, the present invention facilitates the attachment of reinforcing members to the outer box to ensure stable attachment strength, and also simplifies the fitting shape between the inner box flange and the outer box to prevent leakage of the foam insulation material. With the goal.

Means for Solving the Problems In order to achieve the above object, the insulating box of the present invention has a double flange formed on the front opening edge of the outer box, which is formed by bending a band-shaped painted steel plate whose surface is pre-painted. A reinforcing member made of an iron plate is fixed and fused to the back surface of this double flange by one-sided spot welding, and a fitting portion is formed on the inner box flange to be fitted to the double flange.

Effect: With the above-described configuration, the present invention can firmly fix the reinforcing member of the outer box, secure the strength of a part of the corner of the outer box, and prevent a gap between the inner box flange and the double flange. It is possible to prevent leakage of the foamed heat insulating material that occurs due to the formation of foamed heat insulating materials.

EXAMPLE Hereinafter, a heat insulating box for a refrigerator according to an example of the present invention will be described with reference to the drawings.

In Figures 1 to 9, 22 is a cabinet forming the outer box 23 of the refrigerator, including a left side plate 24, a right side plate 26, and a top plate 2.
6 and a double flange 27 formed at the edge of the front opening are formed by bending a single band-shaped painted steel plate that has been previously painted. 22a is the painted film, and 22b is the steel plate body. The cabinet 22 has left and right side plates 24.2
5, a substantially horizontal flange 28 facing inward at the lower end edge and a substantially vertical flange 29 facing inward from the rear end edge are bent and formed at the rear end of the top plate 26. Although the flange 3o is bent and not shown, the flange 2
The outer box 23 is constructed by fixing the bottom plate 31 with screws or the like to a supporting member fixed to 8.28 with screws or the like, and also fixing the back plate 32 across the flanges 29, 29, 30 with screws or the like. .

The double flange 27 is connected to the left and right side plates 24. ．． 2B and top plate 26
The front flange 27a and this front flange 2 are bent.
7a, a rear flange 27b that is folded back with a slight gap to the back side of the front flange 27a, and a rear flange 27a that forms a groove 33 between the rear flange 27b and the rear flange 27b.
It is formed by 34 is a reinforcing member made of iron plate, which is attached to the rear flange 2 at the front left corner of the cabinet 22.
7c has a vertical side 34a and a horizontal side 34b which are fixed and melted by one-sided spot welding method on the back side, and a hinge mounting part 3 formed toward the rear from the horizontal side 34b.
4a. The upper hinge 5 is attached to the hinge mounting portion 34a.
A screw hole 34d for mounting is provided. 34e is a protrusion commonly called a projection, which forms a convex portion toward the front of each of the vertical side 34a and the horizontal side 34b. This protrusion 34e has a height of about 0.6 to 1N and an outer diameter of about 1 to 2H. Note that this protrusion 34e is located at the hinge mounting portion 3.
40 is also provided in the direction of contact with the top plate 26.

Here, the single-sided spot welding method of the reinforcing member 340 will be explained in detail. As shown in FIGS. 1 to 3, the reinforcing member 34 is brought into contact with the back surface of the rear flange 27a of the cabinet 22, and then the back surface of the flange 27c is coated with a coating film. The steel plate main body 22b is in contact with the reinforcing member 34 on the opposite side to the steel plate 22a. Furthermore, as shown in FIG. 7, this method involves positioning the pace 35a of the spot tool 36 on the side of the coating film 22a that does not conduct electricity, that is, having no conductivity, and electrically welding with the spot tool 35 only on one side, on the side opposite to the coating film 22a. This is what we do.

ssb is a steel plate holding plate B called a tip of the − (minus) electrode, and 35o is a holding plate C of the + (plus) electrode. The reinforcing member 34 is pressed against the steel plate main body 22b by this holding plate C as shown in the figure, and furthermore, a current is passed from the holding plate C through the steel plate main body 22b to the holding plate B, and the heat generated at that time causes the reinforcing member 34 to be fixed and melted. Ru. Furthermore, the protrusion 34e provided on the reinforcing member 34 allows current and pressure to be applied to the protrusion 34.
The projections 34e are concentrated in the portion e and are completely melted, forming the steel plate main body 2.
2b more stably.

Note that the right reinforcing member 3 does not have the hinge mounting portion 340 of the reinforcing member 34 used for the left partition in the front cloth partition of the cabinet 22.
6 is fixed in the same manner as the reinforcing member 34.

Next, the inner box 37 will be described. 37a is an inner box flange, and 37b is a fitting part forming a protrusion formed on the inner box flange 37a. The foam insulation material 38 is inserted and fitted into the
This prevents leakage during foam filling. 27d is a protrusion formed on the rear flange 27c, which prevents the inner box 37 from coming off during foam filling of the foam insulation material 38 or during assembly work before foam filling. 27e is an extended flange extended from the rear flange 27c, which facilitates the insertion work of the inner box flange 37a and ensures a moderate gap (toward dimension) with the inner box 37 (about 3 to 1 oH). By doing so, the flow of the foam insulation material 38 during foam filling is obstructed, and the inner box flange 37a
This prevents the foamed heat insulating material 38 from leaking from the fitting portion of the groove 33 of the cabinet 22.

As described above, according to this embodiment, the reinforcing member 21 is fixed and melted by one-sided spot welding on one side of the steel plate main body 22b on which the coating film 22a of the cabinet 22 formed of a painted steel plate is not formed. Since it is fixed,
Stable mounting strength can be obtained with a simple device, and when the inner box flange 37a and the double flange 27 are fitted, the reinforcing member 34 is not inserted into the groove 33 as in the conventional case, and the fitting shape is simple. It is possible to maintain stable fitting and to reliably prevent leakage of the foamed heat insulating material 38.

Also, in this example, a single-sided spot welding method was explained using a painted steel plate that was painted only on one side, but even if a coating film is formed on both sides, it can be welded only on one side by electrical or mechanical methods as long as there is no problem in appearance. Needless to say, this method can be used if the paint film is removed.

Effects of the Invention As described above, the present invention forms a double flange at the front opening edge of the outer box, which is formed by bending a belt-shaped painted steel plate whose surface is pre-painted, and one-sided spot welding is performed on the back surface of this double flange. Since the reinforcing member made of steel plate is fixed and fused in the process, the strength of the reinforcing member is increased several times compared to the conventional method of fitting and retaining or fixing with rivets, and it is easy to install. It is possible to perform stable installation with a suitable device, and since the fitting part is formed on the inner box flange and fitted into the groove of the double flange, the fitting shape can be simplified and stable. It is possible to maintain a proper fit and reliably prevent leakage of the foam insulation material.

[Brief explanation of the drawing]

FIG. 1 is an enlarged cross-sectional view of the main parts showing a fitted state of the inner box of a heat-insulating box body showing one embodiment of the present invention, and FIG. 2 is a perspective view of the main parts thereof.
Fig. 3 is a sectional view of the main part thereof, Fig. 4 is an assembled perspective view thereof, Fig. 5 is an enlarged sectional view of the main part of the reinforcing member, Fig. 6 is a front perspective view thereof, and Fig. 7 is an assembled perspective view thereof. , Fig. 8 is a sectional view showing the manufacturing process, Fig. 9 is a perspective view of the inner box, Fig. 10 is a perspective view of a conventional refrigerator, Fig. 11 is a perspective view of the main part, and Fig. 12 is the main part. 13 is an assembled perspective view of the main part, FIG. 14 is an assembled perspective view of the main part, FIG. 16 is a perspective view of the main part, and FIG. 1θ is a sectional view of the main part. 22... Cabinet, 23... Outer box, 27... Double flange, 27a...
Front flange, 27b... Back flange, 27
a... Rear flange, 34... Reinforcement member, 34a... Vertical side, 34b... Horizontal side,
37...Inner box, 37a...Inner box flange, 37b...Fitting part, 38...Foam insulation material. Name of agent: Patent attorney Shigetaka Awano and one other person in charge of 3rd and 11th figures

Claims (1)

[Claims] A cabinet formed by bending a strip-shaped painted steel plate that has been pre-painted on one side, a front flange formed by bending the front opening edge inward, and a back flange folded back on the back side of the front flange. , a double flange consisting of a back flange with a groove continuous from this back flange and a rear flange, and the vertical and horizontal sides are fused and fixed by spot welding on one side to the back of the rear flange. An outer box made of reinforced steel plate reinforcing members, an inner box made of resin, and an inner box flange formed on the outer periphery of the inner box,
A heat insulating box body comprising a fitting part formed on the inner box flange and inserted and fitted into the groove of the cabinet double flange, and a foamed heat insulating material filled between the inner box and the outer box.