JPH1076336A - Vacuum double structure and method for coating foilonouter surface of inner cylinder part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To productively and inexpensively obtain a vacuum double structure having an excellent thermal insulation property and high quality by coating and depositing the outer surface of an inner cylinder part with an Al foil or the like and housing this within the outer cylinder part with a vacuum gap. SOLUTION: The inner cylinder 2 is housed within the outer cylinder part 1 of stainless or the like, and both are joined only in the opening part 4. Next, the air between both is evacuated and the vacuum air-gap part 3 is formed to obtain the vacuum double structure A. In this case, the outer surface of the inner cylinder part 2 is coated with the foil 5 of AN, Cu or the like and the foil is fixed to the inner cylinder part 2 with a resistance welding at the prescribed position. In this welding, the foil 5 is wound around the inner cylinder part 2 with the gap 6, an overlap allowance 7 or the gap are formed, and welding is executed with a welding current fed while pressing, rolling and transferring an electrode in the longitudinal direction along each edge part. In this case, a broken line-like deposited part is preferably formed by intermittently feeding the current. In this way, the backlash and positional deviation of the foil 5 are surely prevented and the vacuum double structure A without the degradation of the thermal insulation property and quality is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum double structure and a method for coating an outer foil on an inner cylinder.

[0002]

2. Description of the Related Art Conventionally, in a vacuum double structure in which a vacuum space is formed between an outer cylindrical portion and an inner cylindrical portion housed in the outer cylindrical portion, in order to improve heat insulation performance. In addition, various improvements have been made. As the method, for example, a method of applying silver or copper plating to the outer surface of the inner cylinder part, a method of inserting a stainless steel reflector between the inner cylinder part and the outer cylinder part, and a method of interposing the inner cylinder part and the outer cylinder part In the meantime, there has been known a method of super-insulation in which glass wool and aluminum foil are alternately wound in several layers and filled, or a method of winding and wrapping a metal foil around the outer surface of the inner cylinder.

[0003]

However, the above-described silver or copper plating method has disadvantages in that the productivity is poor and the cost is high. In addition, in the method of providing a stainless steel reflection plate, the heat emissivity is higher than that of aluminum or copper, so that the heat insulating property is not significantly improved. In addition, the method using super insulation is extremely expensive and has the drawback that the product becomes heavy.

[0004] In the method of wrapping a metal foil around the outer surface of the inner cylindrical portion, the foil may be polished when the outer surface of the outer cylindrical portion is polished during production or when vibration is applied during use. There was a problem that the winding collapsed and the foil came into contact with the inner surface of the outer cylindrical portion, thereby deteriorating the heat insulating property and generating an unusual noise due to rattling of the foil. Moreover, it is necessary to wind the foil over the outer peripheral surface of the inner cylindrical portion over 400 ° to 540 °, and there is a problem that the required amount of the foil is relatively large.

Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a vacuum double structure which is excellent in heat insulation, can improve productivity, and can reduce manufacturing cost. And

Further, the present invention has excellent heat insulating properties,
It is an object of the present invention to provide a method for coating an inner cylinder portion outer surface foil that can realize a vacuum double structure that can improve productivity and reduce manufacturing costs.

[0007]

In order to achieve the above object, a vacuum double structure according to the present invention comprises a vacuum gap between an outer cylinder and an inner cylinder housed in the outer cylinder. The outer surface of the inner cylindrical portion is covered with aluminum or copper foil, and a predetermined portion of the foil is fixed to the inner cylindrical portion by resistance welding. is there.

It is desirable that a gap is formed between the inner cylindrical portion and the foil covering the inner cylindrical portion at most of the area except the welded portion fixed by resistance welding and the vicinity thereof. It is also preferable that the outer cylinder and the inner cylinder are joined to each other only at the mouth. Further, it is preferable that one edge and the other edge of the foil are overlapped to form an overlap margin, and the overlap margin is fixed to the inner cylindrical portion by resistance welding. In addition, one end edge and the other end edge of the foil are separated from each other with a minute interval,
It is also desirable to be fixed to the inner cylinder by resistance welding.

Further, the method for coating the outer surface foil of the inner cylinder portion according to the present invention provides a vacuum double structure in which a vacuum gap is formed between the outer cylinder portion and the inner cylinder portion housed in the outer cylinder portion. A method of coating an outer surface of an inner cylindrical portion of a body with aluminum or copper foil, wherein one end of the foil is fixed to an outer surface of the inner cylindrical portion by resistance welding, and the foil is coated with the inner cylindrical portion. It is wound around the outer surface one round,
Further, the other end of the foil is fixed to the inner cylinder by resistance welding.

An aluminum or copper foil is formed on the outer surface of the inner cylindrical portion of the vacuum double structure having a vacuum space formed between the outer cylindrical portion and the inner cylindrical portion housed in the outer cylindrical portion. Wherein the foil is wound substantially one round around the outer surface of the inner cylinder, and then one end and the other end of the foil are resistance-welded to the inner cylinder. It sticks.

Further, aluminum or copper foil is formed on the outer surface of the inner cylindrical portion of the vacuum double structure in which a vacuum gap is formed between the outer cylindrical portion and the inner cylindrical portion housed in the outer cylindrical portion. A method in which the foil is wound around the outer surface of the inner cylindrical portion substantially once, and the foil is subjected to resistance welding in a circumferential direction to fix the foil to the inner cylindrical portion. is there.

It is desirable that the resistance welding be performed intermittently so that the welded portion formed by the resistance welding becomes a broken line.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on the illustrated embodiments.

FIGS. 1 and 2 show an embodiment of a vacuum double structure according to the present invention. This vacuum double structure A is housed in an outer cylinder 1 and the outer cylinder 1. A vacuum space 3 is formed between the inner cylinder 2 and the case, and the case of a heat retaining container is exemplified.

The outer tube portion 1 and the inner tube portion 2 are each formed of a metal such as stainless steel and are joined to each other only at the upper end opening 4. Also, at the lower ends of the outer cylinder 1 and the inner cylinder 2,
Bottom walls 10 and 11 are formed.

As shown in FIG. 1, FIG. 2, FIG. 3, and FIG. 4, the outer surface of the inner cylindrical portion 2 is covered with aluminum or copper foil 5 and a predetermined portion of the foil 5 is subjected to resistance welding. To the inner cylinder 2. Specifically, one end edge and the other end of the foil 5 are overlapped to form an overlap allowance 7, and the overlap allowance 7 is
It is fixed to the inner cylinder part 2 by resistance welding.

[0017] In more detail, as shown in the enlarged sectional view of FIG. 5, it is welded to one end edge portion 5a of the foil 5 to the inner cylindrical portion 2 to form a welded portion W _1, The other end of the foil 5 Edge 5b
Is welded to the inner cylindrical portion 2 via one edge portion 5a to form a welded portion W ₂
To form In other words, At a cross-sectional shape, the welded portion W ₁ of the two places, W ₂ at one end of the foil 5 edge 5a and the other edge 5
b is welded to the outer surface of the inner cylinder 2. In the drawings of the present invention, welded portions W, W ₁ , and W ₂ are indicated by crosses in the cross-sectional views.

Further, as shown in FIG. 4, in the weld area W fixed by resistance welding and in most areas except for the vicinity thereof,
A gap 6 is formed between the inner cylinder 2 and the foil 5 covering the inner cylinder.
Further, as shown in FIGS. 2 and 3, the welded portion W formed by resistance welding has a dashed shape parallel to the longitudinal direction of the inner cylindrical portion 2.

The method of coating the outer surface of the inner cylindrical portion 2 of the vacuum double structure A with the foil 5 will now be described. As shown in FIG. 6, the foil 5 is wound. Wound body 8
The foil 5 is pulled out from the above, flattened by the press rolls 9, 9, and then cut into a predetermined length by the cutting cutters 12, 12.

Next, as shown in FIG. 6A, one end edge 5a of the foil 5 is fixed to the outer surface of the inner cylindrical portion 2 by resistance welding. That is, the electrode body 15 is rolled along one edge 5a of the foil 5 by the resistance welding electrode 13 having the rotatable disk-shaped electrode body 15, so that the seam is formed so that the welded portion W becomes a broken line. Welding (resistance welding) is performed intermittently. That is, the electrode 13 is rolled while being pressed against one end edge 5a of the foil 5, and a current is intermittently supplied from a power source (not shown). Then, the foil 5 is wound around the outer surface of the inner cylindrical portion 2 substantially once as indicated by B. At this time,
It is wound so that a gap is formed between the foil 5 and the inner cylinder portion 2. Reference numeral 14 denotes a rotating roll for winding the foil 5 around the inner cylinder 2.

Further, as shown by C, the other end 5 of the foil 5
b is fixed to the inner cylindrical portion 2 by resistance welding. That is, the resistance welding electrode 13 extends along one end 5a and the other end 5b of the foil 5.
The electrode body 15 is rolled while being pressed, and a current is intermittently supplied so that seam welding (resistance welding) is performed intermittently so that the welded portion W becomes a broken line.

By performing seam welding as described above,
It does not require a brazing material or a welding material such as a welding rod, the working environment is maintained well, and it is possible to prevent the one edge 5a and the other edge 5b of the foil 5 from being displaced during welding. Wrinkles can be hardly generated on the foil 5. In addition, the width of the overlapping margin 7 of the foil 5 can be reduced. Specifically, when the width dimension of the overlap margin 7 is c, it can be reduced to 0 <c ≦ 10 mm. Therefore, the amount of use of the foil 5 can be reduced, which can contribute to cost reduction. Further, the foil 5 can cover the inner cylindrical portion 2 in a loose state, and the gap 6 can be easily formed between the foil 5 and the inner cylindrical portion 2.

[0023] Thus, as shown in FIG. 5, the welded portion W ₁ formed by welding one end edge 5a of the foil 5 to the inner cylindrical portion 2, the foil 5
The other end edge 5b, can form a weld portion W ₂ formed by welding the inner cylinder portion 2 through one end edge 5a, the foil 5 is securely fixed to the outer surface of the inner cylinder portion 2.

Thereafter, the outer cylindrical portion 1 and the inner cylindrical portion 2 are joined to each other only at the upper end opening 4, and the air between the outer cylindrical portion 1 and the inner cylindrical portion 2 is evacuated to form a vacuum gap 3 1 and FIG. 2
The vacuum double structure A (container for keeping heat) shown in FIG.

With the above-described structure, even when an external force such as vibration or rotation or its own weight acts on the vacuum double structure, the vacuum double structure can prevent the foil 5 from rattling or displacing and from contacting the outer cylinder 1. Therefore, a decrease in heat insulation performance and a decrease in quality can be prevented. Moreover, since no rattling of the foil occurs, generation of abnormal noise can be prevented.

Further, since the contact area between the inner cylindrical portion 2 and the foil 5 is extremely small, a thermal short circuit is also reduced. In addition, the gap 6 between the inner cylinder portion 2 and the foil 5 can be reliably held, and radiant heat can be shielded. Therefore, excellent heat insulating performance can be obtained.

Next, FIG. 7 shows a cross-sectional view of a vacuum doubling in which one end 5a and the other end 5b of the foil 5 are welded to the outer surface of the inner cylindrical portion 2 at one welding portion W. 1 shows a structure A. As described above, in order to cover the inner cylindrical portion 2 with the foil 5, the foil 5 is cut into a predetermined length, the foil 5 is wound around the inner cylindrical portion 2 substantially once, and then the foil 5 is 2 is wound around the outer surface substantially once, and then the foil 5
The overlapping margin 7 between the one end edge 5a and the other end 5b is
Is subjected to resistance welding so as to form one broken line in the longitudinal direction.

That is, the other end 5b of the foil 5 is fixed to the outer surface of the inner cylinder 2 via the one end 5a by seam welding. Other configurations are the same as those in FIGS. Thereby, the step of welding only one edge 5a of the foil 5 to the outer surface of the inner cylinder 2 becomes unnecessary, and the number of steps can be reduced.

FIGS. 8, 9 and 10 show the essential parts of another vacuum double structure, wherein one end 5a and the other end 5a of the foil 5 are shown.
b are separated from each other at a minute interval S and are fixed to the inner cylindrical portion 2 by resistance welding. Thus, in order to cover the inner cylinder part 2 with the foil 5, the foil 5 is cut into a predetermined length,
The foil 5 is wound around the inner cylindrical part 2 substantially one round, and as shown in FIG.
Are arranged in a separated manner, and two disk-shaped electrode bodies 15,
The one end 5a and the other end 5b, which are separated from each other, are simultaneously fixed to the outer surface of the inner cylindrical portion 2 by seam welding at the resistance welding electrode 13 having 15.

That is, one end 5a of the foil 5 and the other end 5
b is fixed to the inner cylindrical portion 2 by resistance welding. Other configurations are
It is similar to that of FIGS. Thereby, the number of steps can be reduced, and the one end 5a and the other end 5b of the foil 5 can be reliably welded to the outer surface of the inner cylinder 2.

FIG. 11 shows another vacuum double structure, and FIG. 12 shows a state in which the inner cylindrical portion 2 of the vacuum double structure A is covered with a foil 5. The foil 5 is fixed to the outer peripheral surface of the inner cylindrical portion 2 at a welding portion W which is formed in a dashed shape in the circumferential direction. Thus, in order to cover the inner cylindrical portion 2 with the foil 5 in this manner, as shown in FIG. 13, the foil 5 is pulled out from the wound body 8 around which the foil 5 is wound, and Then, the foil 5 is cut to a predetermined length by the cutting cutters 12 and 12.

Next, as shown in FIGS.
The foil 5 is fixed to the inner cylindrical portion 2 by performing resistance welding in the circumferential direction on the foil 5 while being wound around the outer surface substantially once. In particular,
Resistance welding (seam welding) so that the welded portion W becomes a broken line
Is performed intermittently in the circumferential direction. Note that, in FIG.
Are two dashed lines in the circumferential direction, but two disk-shaped electrode bodies 15, 15 of the two resistance welding electrodes 13, 13
It is preferable to form two dashed welds W at the same time. With this configuration, the inner cylindrical portion 2 can be covered with the foil 5 and the foil 5 can be welded to the inner cylindrical portion 2 at the same time.
The number of steps can be further reduced.

Next, FIGS. 14, 15, 16 and 17 show still another vacuum double structure, and exemplifies a case of a double pipe for heat insulation used in a cold region or the like. That is, both ends of the outer cylinder part 1 and the inner cylinder part 2 are open, and the outer cylinder part 1 and the inner cylinder part 2 are joined to each other only by the two openings 16, 16.

Thus, one end edge 5a of the foil 5 is
The welded to form a welded portion W _1, further forming a weld portion W ₂ of the other end edge 5b of the foil 5 and welded to the inner cylinder portion 2 through one end edge 5a. That is, the outer surface of the inner cylinder 2 is covered with the foil 5 and a predetermined portion of the foil 5 is fixed to the inner cylinder 2 by resistance welding. In addition, a gap 6 is formed between the inner cylindrical portion 2 and the foil 5 covering the inner cylindrical portion 2 in most of the area excluding the welded portion W fixed by resistance welding and the vicinity thereof. Further, the welded portion W formed by resistance welding has a dashed shape parallel to the longitudinal direction of the inner cylinder portion 2. The method for coating the outer surface foil of the inner cylinder portion is the same as that described with reference to FIG.

With this configuration, this vacuum double structure A (double pipe) can obtain high quality and excellent heat insulation. As the method of coating the outer surface of the inner cylinder portion, the method described with reference to FIG. 7, the method described with reference to FIGS. 8, 9, and 10, or the method described with reference to FIGS. Changing is also preferable.

It is to be noted that the present invention is not limited to the above-described embodiment, and the design thereof can be freely changed. Each resistance welding may be performed continuously. The cross-sectional shapes of the outer tube portion 1 and the inner tube portion 2 may be elliptical, triangular, rectangular, or other polygons in addition to the circular shape as shown in the figure. In addition, spot welding (spot welding) may be preferable as resistance welding in addition to seam welding.

[0037]

The present invention has the following remarkable effects by the above-mentioned structure.

According to the vacuum double structure of the first aspect,
High durability against external forces such as vibration and rotational force can be obtained. Therefore, it is excellent in heat insulation. In addition, since the backlash of the foil 5 does not occur, no abnormal noise occurs. Further, productivity can be improved and manufacturing cost can be reduced.

According to the vacuum double structure of claim 2,
Since the same effect as that of the first aspect can be obtained, and the contact area between the inner cylindrical portion 2 and the foil 5 can be reduced,
Since thermal short circuits are reduced and the radiant heat can be shielded by the foil 5, more excellent heat insulating properties can be obtained.

According to the vacuum double structure of the third aspect,
The same effect as that of the first or second aspect can be obtained, and a container excellent in heat retention (insulation) can be formed.

According to the vacuum double structure of the fourth aspect,
The same effect as that of the first, second or third aspect can be obtained, and the contact area between the inner cylindrical portion 2 and the foil 5 can be made extremely small, so that more excellent heat insulating properties can be obtained.

According to the vacuum double structure of claim 5,
The same effect as that of the first, second, or third aspect is obtained, and the foil 5 can be securely fixed to the inner cylindrical portion 2, and the durability against external forces such as vibration and rotational force is further increased.

According to the method for coating the outer surface foil of the inner cylinder portion, the foil 5 can be easily and reliably fixed to the inner cylinder portion 2. In addition, the amount of the foil 5 used is small, which can contribute to a reduction in manufacturing cost.

According to the method for covering the outer foil of the inner cylinder portion according to the seventh aspect, the foil 5 can be easily and reliably fixed to the inner cylinder portion 2. In addition, the number of steps can be reduced, and the amount of use of the foil 5 can be reduced, which can contribute to a reduction in manufacturing cost.

According to the method for coating the outer surface foil of the inner cylinder portion, the foil 5 can be easily and reliably fixed to the inner cylinder portion 2. In addition, the number of steps can be further reduced, and the amount of use of the foil 5 can be reduced, which can contribute to a reduction in manufacturing cost.

According to the ninth aspect of the present invention, the same effect as that of the sixth, seventh or eighth aspect is obtained, and wrinkles are hardly generated on the foil 5 during resistance welding. In addition, displacement of the foil 5 can be prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a vacuum dual structure of the present invention.

FIG. 2 is a front view in which only the outer cylinder is sectioned.

FIG. 3 is an explanatory view of a state in which an inner cylindrical portion is covered with a foil.

FIG. 4 is a cross-sectional plan view of a main part.

FIG. 5 is an enlarged sectional view of a main part.

FIG. 6 is an explanatory view of a method of coating the outer surface foil of the inner cylinder portion.

FIG. 7 is an enlarged sectional view of a main part.

FIG. 8 is a front view of another embodiment of the vacuum dual structure.

FIG. 9 is an enlarged sectional view of a main part.

FIG. 10 is a cross-sectional plan view.

FIG. 11 is a cross-sectional front view of another embodiment of the vacuum dual structure.

FIG. 12 is an explanatory diagram of a state in which the inner cylindrical portion is covered with a foil.

FIG. 13 is an explanatory view of another inner cylinder portion outer surface foil coating method.

FIG. 14 is a sectional view of still another embodiment of the vacuum dual structure.

FIG. 15 is an explanatory diagram of a state in which an outer cylindrical portion is broken.

FIG. 16 is an enlarged sectional view of a main part.

FIG. 17 is a sectional view of a main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer cylinder part 2 Inner cylinder part 3 Void part 4 Mouth part 5 Foil 5a One end edge part 5b The other end edge part 6 Gap 7 Overlap margin A Vacuum double structure W Welding part S Minute space

Claims (9)

[Claims] 1. A vacuum double structure comprising a vacuum gap 3 formed between an outer cylinder 1 and an inner cylinder 2 housed in the outer cylinder 1. A vacuum double structure wherein an outer surface of the portion 2 is covered with an aluminum or copper foil 5 and a predetermined portion of the foil 5 is fixed to the inner cylindrical portion 2 by resistance welding. 2. A gap 6 is formed between the inner cylindrical portion 2 and the foil 5 covering the welded portion W fixed by resistance welding and in most areas except the vicinity thereof. The vacuum double structure as described. 3. The vacuum double structure according to claim 1, wherein the outer tube portion 1 and the inner tube portion 2 are joined to each other only at the mouth portion 4. 4. An overlapping margin 7 is formed by overlapping one edge 5a and the other edge 5b of the foil 5, and the overlapping margin 7 is fixed to the inner cylinder 2 by resistance welding. 4. The vacuum double structure according to 1, 2, or 3. 5. An end portion 5a and an other end portion 5b of the foil 5 are separated from each other at a minute interval S and are fixed to the inner cylindrical portion 2 by resistance welding. 3. The vacuum double structure according to 3. 6. The inner cylindrical portion 2 of the vacuum double-structure A having a vacuum space 3 formed between the outer cylindrical portion 1 and the inner cylindrical portion 2 housed in the outer cylindrical portion 1. A method of coating an outer surface with an aluminum or copper foil 5, wherein one end edge 5a of the foil 5 is provided.
Is fixed to the outer surface of the inner cylindrical portion 2 by resistance welding.
Is wound around the outer surface of the inner cylindrical portion 2 substantially once, and the other end 5b of the foil 5 is fixed to the inner cylindrical portion 2 by resistance welding. Foil coating method. 7. The inner cylindrical portion 2 of the vacuum double structure A having a vacuum space 3 formed between the outer cylindrical portion 1 and the inner cylindrical portion 2 housed in the outer cylindrical portion 1. A method of coating an outer surface with an aluminum or copper foil 5, wherein the foil 5 is coated with the inner cylindrical portion 2.
Is wound around the outer surface substantially once, and then one end edge 5a of the foil 5 is wound.
And the other end edge 5b is fixed to the inner cylinder 2 by resistance welding. 8. An inner cylindrical portion 2 of a vacuum double structure A having a vacuum space 3 formed between an outer cylindrical portion 1 and an inner cylindrical portion 2 housed in the outer cylindrical portion 1. A method of coating an outer surface with an aluminum or copper foil 5, wherein the foil 5 is coated with the inner cylindrical portion 2.
A method of coating the foil 5 on the outer surface of the inner cylinder 2 by applying resistance welding to the foil 5 in the circumferential direction while winding the foil 5 substantially one round on the outer surface of the inner cylinder 2. 9. The resistance welding is performed intermittently so that the welded portion W formed by the resistance welding has a broken line shape.
Or the method of coating the inner cylinder portion outer surface foil described in 8 above.