JP7011979B2 - Vacuum double structure and its manufacturing method, and headphones - Google Patents

Description

The present invention relates to a vacuum double structure, a method for manufacturing the same, and headphones.

Conventionally, it has a bottomed cylindrical outer housing and an inner housing with one end open, and the open ends are joined to each other while the inner housing is housed inside the outer housing, and these outer housings are joined. There is a vacuum double structure in which a vacuum layer is provided between the body and the inner housing.

Such a vacuum double structure is used as a vacuum heat insulating container having heat and cold insulation functions. Recently, a speaker device that suppresses vibration propagating to the outside by an enclosure using a vacuum double structure has also been developed (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-82243

By the way, in the above-mentioned conventional vacuum double structure, in a chamber in which the inner housing is housed inside the outer housing, the open ends are joined to each other by welding, and then the pressure is reduced (evacuated) to a high vacuum. It is manufactured by sealing the degassing holes provided in the outer housing.

Further, in the case of a vacuum double structure having one end open, it is common to provide a degassing hole in the center of the bottom wall of the outer housing. On the other hand, in the case of a vacuum double structure having both ends open, it is necessary to provide a degassing hole in the peripheral wall of the outer housing. In this case, the thickness of the vacuum layer provided between the outer housing and the inner housing becomes non-uniform at the position where the degassing hole is provided. In addition, the mechanical strength of the outer housing is also reduced. Furthermore, it is necessary to press the degassing holes.

Further, in order to reduce the size and weight of the vacuum double structure having both ends open, not only the thickness of the outer housing and the inner housing is reduced, but also the outer housing and the inner housing are combined. It is also necessary to reduce the thickness (interval) of the vacuum layers provided between them. Therefore, when the degassing hole is provided in the peripheral wall of the outer housing described above, it becomes very difficult to reduce the size and weight of the vacuum double structure.

The present invention has been proposed in view of such conventional circumstances, and uses a vacuum double structure capable of miniaturization and weight reduction, a method for manufacturing the same, and such a vacuum double structure. The purpose is to provide headphones.

In order to achieve the above object, the present invention provides the following means.
[1] It has a metal outer housing and an inner housing having both ends open, and the open ends are joined to each other while the inner housing is housed inside the outer housing, and the outer housing is joined. A vacuum double structure in which a vacuum layer is provided between the body and the inner housing.
One end portion of the outer housing and the inner housing to which one open end side is joined by welding,
A vacuum double structure characterized in that the other open end side of the outer housing and the inner housing has the other joint end portion joined by brazing.
[2] The peripheral wall forming the other joint end of the outer housing and the peripheral wall forming the other joint end of the inner housing are arranged with a radial gap.
The vacuum double structure according to the above [1], wherein the peripheral walls of the other joint are joined to each other via a brazing material that has penetrated into the gap.
[3] A groove is provided on the distal end side of the peripheral wall forming the other joint end of the outer housing and the peripheral wall forming the other joint end of the inner housing.
The vacuum double structure according to the above [1] or [2], wherein the peripheral walls of the other joint end are joined to each other via a brazing material accumulated in the groove.
[4] The vacuum double structure according to any one of the above [1] to [3], wherein a brazing receiving member is attached to the other opening end via a brazing material.
[5] The peripheral wall forming the other joint end portion of the outer housing has a wax receiving portion folded back toward the inner peripheral side with a portion facing the open end of the inner housing.
The vacuum double structure according to the above [1] or [2], wherein the peripheral walls of the other joint end are joined to each other via a brazing material accumulated in the brazing receiving portion.
[6] The peripheral wall forming the other joint end portion of the inner housing has a wax receiving portion folded back toward the outer peripheral side with a portion facing the open end of the outer housing.
The vacuum double structure according to the above [1] or [2], wherein the peripheral walls of the other joint end are joined to each other via a brazing material accumulated in the brazing receiving portion.
[7] The peripheral wall forming the one joint end of the outer housing and the peripheral wall forming the one joint end of the inner housing are arranged so as to overlap in the radial direction.
The vacuum double structure according to any one of the above [1] to [6], wherein the open ends of one of the joint ends are joined by welding.
[8] A pair of left and right headphones or one of the left and right headphone bodies including a speaker unit that converts an electric signal into vibration to emit sound and a housing arranged on the back side of the speaker unit is provided.
The headphone characterized in that the housing is the vacuum double structure according to any one of the above [1] to [7].
[9] It has a metal outer housing and an inner housing having both ends open, and the open ends are joined to each other while the inner housing is housed inside the outer housing, and the outer housing is joined. A method for manufacturing a vacuum double structure in which a vacuum layer is provided between a body and the inner housing.
After joining one open end side of the outer housing and the inner housing by welding, the other open end side of the outer housing and the inner housing is placed in a chamber depressurized to a high vacuum. A method for manufacturing a vacuum double structure, which comprises joining by brazing.
[10] A peripheral wall forming the other joint end of the outer housing and a peripheral wall forming the other joint end of the inner housing are arranged with a radial gap.
With the other end side facing downward or upward, the inside of the chamber is depressurized to a high vacuum, and then the brazing filler metal melted by heating is allowed to permeate into the gap, thereby forming the peripheral walls of each other. The method for manufacturing a vacuum double structure according to the above [9], which comprises joining through a material.
[11] A groove is provided on the distal end side of the peripheral wall forming the other joint end of the outer housing and the peripheral wall forming the other joint end of the inner housing.
With the other open end side facing upward, the inside of the chamber is depressurized to a high vacuum, and then the brazing filler metal melted by heating is accumulated in the groove portion, whereby the peripheral walls of each other are passed through the brazing filler metal. The method for manufacturing a vacuum double structure according to the above [9] or [10], which comprises joining with a vacuum double structure.
[12] A brazing receiving member is arranged so as to face the other end of the opening.
With the other opening end side facing downward or upward, the inside of the chamber is depressurized to a high vacuum, and then the brazing material melted by heating is stored in the brazing receiving member to form the peripheral walls of each other. The method for manufacturing a vacuum double structure according to any one of the above [9] to [11], which comprises joining via a brazing material.
[13] A wax receiving portion that is folded back toward the inner peripheral side with a portion facing the open end of the inner housing is provided on the peripheral wall forming the other joint end portion of the outer housing.
With the other open end side facing downward, the inside of the chamber is depressurized to a high vacuum, and then the brazing filler metal melted by heating is stored in the brazing receptacle, thereby forming the peripheral walls of the brazing filler metal. The method for producing a vacuum double structure according to the above [9] or [10], which comprises joining via.
[14] A wax receiving portion that is folded back toward the outer peripheral side with a portion facing the open end of the outer housing is provided on the peripheral wall forming the other joint end of the inner housing.
With the other open end side facing downward, the inside of the chamber is depressurized to a high vacuum, and then the brazing filler metal melted by heating is stored in the brazing receptacle, thereby forming the peripheral walls of the brazing filler metal. The method for producing a vacuum double structure according to the above [9] or [10], which comprises joining via.
[15] The peripheral wall forming the one joint end portion of the outer housing and the peripheral wall forming the one joint end portion of the inner housing are arranged so as to overlap in the radial direction.
The method for manufacturing a vacuum double structure according to any one of the above [9] to [14], wherein the open ends are joined to each other by welding in this state.

As described above, according to the present invention, it is possible to provide a vacuum double structure capable of miniaturization and weight reduction, a method for manufacturing the same, and headphones using such a vacuum double structure. ..

The configuration of the vacuum double structure according to the first embodiment of the present invention is shown, (A) is a sectional view thereof, (B) is a side view thereof, and (C) is a front view seen from one end side thereof. D) is a front view seen from the other end side. It is a figure for demonstrating the manufacturing process of the vacuum double structure shown in FIG. 1, and is the cross-sectional view which shows the state which joins the other open end side of the outer housing and the inner housing by brazing. The configuration of the vacuum double structure according to the second embodiment of the present invention is shown, (A) is a sectional view thereof, (B) is a side view thereof, and (C) is a front view seen from one end side thereof. D) is a front view seen from the other end side. The configuration of the vacuum double structure according to the third embodiment of the present invention is shown, (A) is a sectional view thereof, (B) is a side view thereof, and (C) is a front view seen from one end side thereof. D) is a front view seen from the other end side. The configuration of the vacuum double structure according to the fourth embodiment of the present invention is shown, (A) is a sectional view thereof, (B) is a side view thereof, and (C) is a front view seen from one end side thereof. D) is a front view seen from the other end side. The configuration of the vacuum double structure according to the fifth embodiment of the present invention is shown, (A) is a sectional view thereof, (B) is a side view thereof, and (C) is a front view seen from one end side thereof. D) is a front view seen from the other end side. It is a figure for demonstrating the manufacturing process of the vacuum double structure shown in FIG. 6, and is the cross-sectional view which shows the state which joins the other open end side of the outer housing and the inner housing by brazing. The structure of the vacuum double structure which concerns on 6th Embodiment of this invention is shown, (A) is the sectional view, (B) is the side view. (C) is a front view seen from one end side thereof, and (D) is a front view seen from the other end side. The configuration of the vacuum double structure according to the seventh embodiment of the present invention is shown, (A) is a sectional view thereof, (B) is a side view thereof, and (C) is a front view seen from one end side thereof. D) is a front view seen from the other end side. The configuration of the vacuum double structure according to the eighth embodiment of the present invention is shown, (A) is a sectional view thereof, (B) is a side view thereof, and (C) is a front view seen from one end side thereof. D) is a front view seen from the other end side. The configuration of the vacuum double structure according to the ninth embodiment of the present invention is shown, (A) is a sectional view thereof, (B) is a side view thereof, and (C) is a front view seen from one end side thereof. D) is a front view seen from the other end side. The configuration of the vacuum double structure according to the tenth embodiment of the present invention is shown, (A) is a sectional view thereof, (B) is a side view thereof, and (C) is a front view seen from one end side thereof. D) is a front view seen from the other end side. The configuration of the vacuum double structure according to the eleventh embodiment of the present invention is shown, (A) is a sectional view thereof, (B) is a side view thereof, and (C) is a front view seen from one end side thereof. D) is a front view seen from the other end side. It is a perspective view which shows the appearance of the headphone body provided in the headphone which concerns on 12th Embodiment of this invention. It is sectional drawing which shows the structure of the headphone body shown in FIG. It is sectional drawing which shows another structure of the headphone body shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First Embodiment)
First, as a first embodiment of the present invention, for example, the vacuum double structure 1A shown in FIGS. 1A to 1D will be described. 1A shows the structure of the vacuum double structure 1A, FIG. 1A is a cross-sectional view thereof, FIG. 1B is a side view thereof, FIG. 1C is a front view seen from one end side thereof, and FIG. 1D is a front view thereof. It is a front view seen from the other end side.

As shown in FIGS. 1A to 1D, the vacuum double structure 1A of the present embodiment has a metal outer housing 2 and an inner housing 3 having both ends open, and the outer housing 2 has an outer housing 2 and an inner housing 3. It has a vacuum double structure in which the open ends of the inner housing 3 are joined to each other while the inner housing 3 is housed inside, and a vacuum layer 4 is provided between the outer housing 2 and the inner housing 3. There is.

The outer housing 2 and the inner housing 3 have the following configurations.
The outer housing 2 has a large-diameter cylindrical portion, a small-diameter cylindrical portion having a smaller diameter, and a tapered portion that gently connects the large-diameter cylindrical portion and the small-diameter cylindrical portion.
Similarly, the inner housing 3 has a large-diameter cylindrical portion, a small-diameter cylindrical portion having a smaller diameter, and a tapered portion provided so as to gently connect the large-diameter cylindrical portion and the small-diameter cylindrical portion. ..
As shown in FIG. 1A, the large-diameter cylindrical portion of the outer housing 2 in the axial direction (vertical direction in FIG. 1, hereinafter, "axial direction" means the vertical direction in the drawing) is in the radial direction (FIG. 1A). The left-right direction in 1 and hereinafter, the "diametrical direction" means the left-right direction in the drawing), which is longer than the large-diameter cylindrical portion of the inner housing 3 facing each other. Further, the small-diameter cylindrical portion of the outer housing 2 in the axial direction is shorter than the small-diameter cylindrical portion of the inner housing 3 facing in the radial direction.

Since the outer housing 2 and the inner housing 3 have the above structure, a radial gap portion 7 which is a space is formed between the outer housing 2 and the inner housing 3.

Metals such as stainless steel and titanium can be used for the outer housing 2 and the inner housing 3. Further, any material that can obtain a vacuum double structure may be used, and other metals or the like can be used.

The vacuum double structure 1A has one joint end portion 5 in which one open end side of the outer housing 2 and the inner housing 3 is joined by welding, and the other of the outer housing 2 and the inner housing 3. The open end side has the other joint end portion 6 joined by brazing.

In the one joint end portion 5, the cylindrical peripheral wall 2b of the outer housing 2 forming the one joint end portion 5 and the cylindrical peripheral wall 3b of the inner housing 3 forming the one joint end portion 5 are formed. And are arranged so as to overlap in the radial direction.
That is, the large-diameter cylindrical portion of the outer housing 2 and the large-diameter cylindrical portion of the inner housing 3 are arranged so as to overlap in the radial direction, and the open ends of both are flush with each other. One of a vacuum double structure 1A and a portion where the tips of both are joined by welding (hereinafter, the portion joined by such welding (the portion indicated by W in the figure) is referred to as a "welded joint portion"). The joint end portion 5 is formed.

In the other joint end portion 6, the cylindrical peripheral wall 2c of the outer housing 2 forming the other joint end portion 6 and the cylindrical peripheral wall 3c of the inner housing 3 forming the other joint end portion 6 are formed. And are arranged with a gap S provided in the radial direction.
That is, a gap S is provided over the entire circumference between the small-diameter cylindrical portion of the outer housing 2 and the small-diameter cylindrical portion of the inner housing 3 in the radial direction.
The peripheral wall 2c of the outer housing 2 and the peripheral wall 3c of the inner housing 3 are joined via the brazing material B that has penetrated into the lower part of the radial gap portion 7 including the gap S (hereinafter, joined by such brazing). The formed portion (the portion indicated by B in the figure) is referred to as a “brazing joint portion”), and the other joint end portion 6 of the vacuum double structure 1A is formed.
Since it has the above structure, in the vacuum double structure 1A, the diameter of one opening 5a formed in a circular shape by one joint end portion 5 is formed in a circular shape by the other joint end portion 6. It is larger than the diameter of the other opening 6a.

In the vacuum double structure 1A of the present embodiment having the above structure, it is not necessary to provide a degassing hole on the side surface of the outer housing 2 as in the conventional case, or to press the degassing hole, and it is radial. It is possible to make the thickness of the vacuum layer 4 of the gap portion 7 uniform in the circumferential direction. As a result, tension is always applied to the outer housing 2 and the inner housing 3 due to the difference between the internal pressure (vacuum pressure) and the external pressure (atmospheric pressure), and the machines of the outer housing 2 and the inner housing 3 The target strength will increase. Therefore, it is possible to increase the rigidity of the vacuum double structure 1A.

Further, in the vacuum double structure 1A of the present embodiment, the plate thickness of the outer housing 2 and the inner housing 3 can be reduced, and the vacuum double structure 1A is provided between the outer housing 2 and the inner housing 3. The thickness (interval) of the vacuum layer 4 can also be reduced. Therefore, it is possible to reduce the size and weight of the vacuum double structure 1A.

Next, the manufacturing method of the vacuum double structure 1A will be described with reference to FIG. Note that FIG. 2 is a diagram for explaining the manufacturing process of the vacuum double structure 1A, and is a cross section showing a state in which the outer housing 2 and the inner housing 3 are joined by brazing on the other open end side. It is a figure.

The method for manufacturing the vacuum double structure 1A of the present embodiment is a chamber in which the pressure is reduced to a high vacuum after joining one open end side of the outer housing 2 and the inner housing 3 by welding (not shown). ), The other open end side of the outer housing 2 and the inner housing 3 is joined by brazing.

First, the brazing filler metal B is previously arranged on the inner peripheral surface of the outer housing 2 forming the radial gap portion 7 or the outer peripheral surface of the inner housing 3.

The brazing material B is not particularly limited, and conventionally known materials such as a metal brazing material and a glass brazing material can be used. When a paste-like brazing material is used, it is easier to arrange than when a solid-like brazing material is used. This makes it possible to accurately infiltrate the molten brazing material B into the gap S during heating, which will be described later.

Next, as shown in FIG. 2, the tips of the large-diameter cylindrical portion of the outer housing 2 and the large-diameter cylindrical portion of the inner housing 3, which are the peripheral walls 2b and 3b forming one of the joint end portions 5, are surfaces. The outer housing 2 and the inner housing 3 are arranged so as to be one.
Then, in this state, the tips of the peripheral walls 2b and 3b of each other are joined over the entire circumference by welding to form a welded joint portion W. For welding, for example, laser welding can be preferably used, but other welding methods can also be used.

Further, as described above, in this state, in the radial direction between the small-diameter cylindrical portion of the outer housing 2 and the small-diameter cylindrical portion of the inner housing 3, which is the peripheral wall 2c forming the other joint end portion 6. A gap S is provided.

Next, the outer housing 2 and the inner housing 3 are installed in the chamber with the other opening end side facing downward. After that, the inside of the chamber is depressurized (evacuated) to a high vacuum. As a result, the radial gap portion 7 including the gap S provided between the outer housing 2 and the inner housing 3 is degassed.

Next, the other open end side of the outer housing 2 and the inner housing 3 is joined by brazing.
Specifically, the vacuum double structure 1A is heated in this chamber. As a result, the brazing material B arranged in advance melts and begins to flow to the other opening end side, and penetrates into the gap S due to the capillary phenomenon. Then, the small-diameter cylindrical portion of the outer housing 2 and the small-diameter cylindrical portion of the inner housing 3, which are the peripheral walls 2c and 3c on the other opening end side, are all around the circumference via the brazing material B that has been hardened after the heating is completed. It is joined over.
Depending on the amount of the brazing material B used, not only the gap S but also the small-diameter cylindrical portion of the inner housing 3 and a part of the tapered portion of the outer housing 2 can be joined.

Here, when the peripheral wall 3c of the inner housing 3 is formed thinner than the peripheral wall 2c of the outer housing 2 by spinning or the like, the tips (outer housing) of the peripheral walls 2c and 3c of each other are formed at the other joint end portion 6. It becomes difficult to join the body 2 and the open end of the inner housing 3 by welding. On the other hand, in the present embodiment, it is possible to join the peripheral walls 2c and 3c to each other over the entire circumference by the above-mentioned brazing.

As described above, it is not necessary to provide a degassing hole on the side surface of the outer housing 2 and press-process the degassing hole as in the conventional case, and by going through the above-mentioned simple step, the present embodiment can be used. It is possible to manufacture the vacuum double structure 1A with good yield. Further, by installing a plurality of the vacuum double structures 1A before the other open end side is joined in the chamber, it is possible to collectively manufacture the plurality of vacuum double structures 1A.

(Second embodiment)
Next, as a second embodiment of the present invention, for example, the vacuum double structure 1B shown in FIGS. 3A to 3D will be described. 3A and 3B show the configuration of the vacuum double structure 1B, FIG. 3A is a cross-sectional view thereof, FIG. 3B is a side view thereof, FIG. 3C is a front view seen from one end side thereof, and FIG. 3D is a front view thereof. It is a front view seen from the other end side. Further, in the following description, the same parts as those of the vacuum double structure 1A will be omitted and the same reference numerals will be given in the drawings.

As shown in FIGS. 3A to 3D, the vacuum double structure 1B of the present embodiment is basically different from the vacuum double structure 1A except that the configuration of the other joint end portion 6 is different. It has the same configuration.

The outer housing 2 includes a cylindrical portion and a tapered portion which is provided in connection with the cylindrical portion and whose diameter is gradually reduced from the diameter of the cylindrical portion.
The inner housing 3 is a tapered portion that connects a large-diameter cylindrical portion, a medium-diameter cylindrical portion having a smaller diameter, a small-diameter cylindrical portion having a smaller diameter, and a large-diameter cylindrical portion and a medium-diameter cylindrical portion. And a tapered portion connecting the medium-diameter cylindrical portion and the small-diameter cylindrical portion.
As shown in FIG. 3A, the tip of the tapered portion of the outer housing 2 is chamfered so as to maintain a gap S at a constant distance from the small-diameter cylindrical portion of the inner housing 3 facing the outer housing 2.

Since the outer housing 2 and the inner housing 3 have the above structure, the open end of the cylindrical portion of the outer housing 2 and the open end of the large-diameter cylindrical portion of the inner housing 3 are made flush with each other. When the outer housing 2 and the inner housing 3 are combined so that a gap S is provided between the tip of the tapered portion of the housing 2 and the small-diameter cylindrical portion of the inner housing 3, the outer housing 2 is combined. A radial gap portion 7 which is a space is formed between the inner peripheral surface of the inner peripheral surface and the outer peripheral surface of the inner housing 3. In the present embodiment, the gap S is also included in the radial gap portion 7.

The peripheral wall 2c of the outer housing 2 and the peripheral wall 3c of the inner housing 3 are joined via a brazing material B that has penetrated into the lower portion of the radial gap portion 7 including the gap S.
That is, the tapered portion of the outer housing 2 and the medium-diameter cylindrical portion, the tapered portion, and the small-diameter cylindrical portion of the inner housing 3 are joined.
It is not always necessary to join the tapered portion of the outer housing 2 to the medium-diameter cylindrical portion, the tapered portion, and the small-diameter cylindrical portion of the inner housing 3, and at least the tapered portion of the outer housing 2 and the inner diameter portion are joined. It suffices if it is joined to the small diameter cylindrical portion of the housing 3.

In the vacuum double structure 1B of the present embodiment, the other joint end portion 6 has such a configuration, so that when the inner housing 3 is housed inside the outer housing 2, the open ends 6 of each other are accommodated. Alignment is easy.

In the vacuum double structure 1B of the present embodiment having the above-mentioned structure, it is not necessary to provide a degassing hole on the side wall of the outer housing 2 or press the degassing hole as in the conventional case, and it is radial. It is possible to make the thickness of the vacuum layer 4 forming the gap portion 7 uniform in the circumferential direction. As a result, tension is always applied to the outer housing 2 and the inner housing 3 due to the difference between the internal pressure (vacuum pressure) and the external pressure (atmospheric pressure), and the outer housing 2 and the inner housing 3 are mechanically tensioned. The strength will increase. Therefore, it is possible to increase the rigidity of the vacuum double structure 1B.

Further, in the vacuum double structure 1B of the present embodiment, the plate thickness of the outer housing 2 and the inner housing 3 can be reduced, and the vacuum double structure 1B is provided between the outer housing 2 and the inner housing 3. The thickness (interval) of the vacuum layer 4 can also be reduced. Therefore, it is possible to reduce the size and weight of the vacuum double structure 1B.

When manufacturing the vacuum double structure 1B of the present embodiment, the same method as in the case of manufacturing the vacuum double structure 1A can be used. That is, after one open end side of the outer housing 2 and the inner housing 3 is joined by welding, the other open end of the outer housing 2 and the inner housing 3 is provided in the chamber decompressed to a high vacuum. The sides may be joined by brazing.

As described above, it is not necessary to provide a degassing hole on the side wall of the outer housing 2 and press-process the degassing hole as in the conventional case, and by going through the above-mentioned simple step, the present embodiment can be used. It is possible to manufacture the vacuum double structure 1B with good yield. Further, by installing a plurality of the vacuum double structures 1B before the other open end side is joined in the chamber, it is possible to collectively manufacture the plurality of vacuum double structures 1B.

In the above embodiment, the case where the side having a large diameter is a welded joint W and the side having a small diameter is a brazed joint (brazing material) B is illustrated, but on the contrary, the side having a large diameter is large. It is also possible to use the brazed joint portion (brazing material) B as the side and the welded joint portion W as the side having a small diameter.

(Third embodiment)
Next, as a third embodiment of the present invention, for example, the vacuum double structure 1C shown in FIGS. 4A to 4D will be described. 4A and 4B show the configuration of the vacuum double structure 1C, FIG. 4A is a cross-sectional view thereof, FIG. 4B is a side view thereof, FIG. 4C is a front view seen from one end side thereof, and FIG. 4D is a front view thereof. It is a front view seen from the other end side. Further, in the following description, the same parts as those of the vacuum double structure 1A will be omitted and the same reference numerals will be given in the drawings.

As shown in FIGS. 4A to 4D, the vacuum double structure 1C of the present embodiment is basically different from the vacuum double structure 1A except that the configuration of the other joint end portion 6 is different. It has the same configuration.

The outer housing 2 includes a large-diameter cylindrical portion, a small-diameter cylindrical portion having a smaller diameter, and a tapered portion provided so as to gently connect the large-diameter cylindrical portion and the small-diameter cylindrical portion.
The inner housing 3 includes a large-diameter cylindrical portion, a small-diameter cylindrical portion having a smaller diameter, and a tapered portion that connects the large-diameter cylindrical portion and the small-diameter cylindrical portion. The open end of the small-diameter cylinder is folded back with a gently curved surface inward over the entire circumference.
Since the outer housing 2 and the inner housing 3 have the above structure, the peripheral walls 2b and 3b forming the joint end portion 5 of the outer housing 2 and the inner housing 3 are arranged so as to be in contact with each other in the radial direction. When the peripheral walls 2c and 3c of the outer housing 2 and the inner housing 3 forming the other joint end portion 6 are arranged with a gap S, the space between the inner peripheral surface of the outer housing 2 and the outer peripheral surface of the inner housing 3 is arranged. A radial gap portion 7 which is a space is formed in the space.
That is, since the outer housing 2 and the inner housing 3 have the above structure, the open end of the large-diameter cylindrical portion of the outer housing 2 and the open end of the large-diameter cylindrical portion of the inner housing 3 are faced with each other. When the outer housing 2 and the inner housing 3 are combined with the small-diameter cylindrical portion of the outer housing 2 and the open end of the small-diameter cylindrical portion of the inner housing 3 flush with each other, the outer housing 2 is combined. A radial gap portion 7 which is a space is formed between the inner peripheral surface of the inner peripheral surface and the outer peripheral surface of the inner housing 3.
The radial gap portion 7 has a gap S between the small-diameter cylindrical portion of the outer housing 2 and the small-diameter cylindrical portion of the inner housing 3 in the radial direction (because the small-diameter cylindrical portion is folded inward with a gentle aspect). A groove portion 6b provided at the other joint end portion 6 between the inner housing 3 and the outer housing 2) is also included.
The groove portion 6b is a portion provided on the distal end side of the peripheral wall 2c forming the other joint end portion 6 of the outer housing 2 and the peripheral wall 3c forming the other joint end portion 6 of the inner housing 3. be.

The large-diameter cylindrical portion of the outer housing 2 and the large-diameter cylindrical portion of the inner housing 3 are arranged so as to overlap in the radial direction, and the open ends of both are flush with each other. When the tips are joined by welding, one joint end 5 of the vacuum double structure 1A is formed.

In this state, a gap S is provided over the entire circumference between the small-diameter cylindrical portion of the outer housing 2 and the small-diameter cylindrical portion of the inner housing 3 in the radial direction.
The peripheral wall 2c of the outer housing 2 and the peripheral wall 3c of the inner housing 3 are joined via the brazing material B that has penetrated into the lower part of the radial gap portion 7 including the gap S (hereinafter, joined by such brazing). The formed portion (the portion indicated by B in the figure) is referred to as a “brazing joint portion”), and the other joint end portion 6 of the vacuum double structure 1A is formed.
That is, the small-diameter cylindrical portion of the outer housing 2 and the small-diameter cylindrical portion of the inner housing 3 are joined.
It is not always necessary to join the small-diameter cylindrical portion of the outer housing 2 and the small-diameter cylindrical portion of the inner housing 3, and depending on the amount of brazing material used, the small-diameter cylindrical portion of the outer housing 2 and the inner It is also possible to further join the tapered portion of the housing 3.

In the vacuum double structure 1C of the present embodiment, since the open end of the small-diameter cylindrical portion of the inner housing 3 at the other joint end portion 6 is gently folded inward over the entire circumference with a curved surface, the outer housing 2 When the inner housing 3 is housed inside, the peripheral wall 3c forming the other joint end 6 of the inner housing 3 is formed inside the peripheral wall 2c forming the other joint end 6 of the outer housing 2. It is easy to insert.

In the vacuum double structure 1C of the present embodiment having the above-mentioned structure, it is not necessary to provide a degassing hole on the side wall of the outer housing 2 or press the degassing hole as in the conventional case, and it is radial. It is possible to make the thickness of the vacuum layer 4 forming the gap portion 7 uniform in the circumferential direction. As a result, tension is always applied to the outer housing 2 and the inner housing 3 due to the difference between the internal pressure (vacuum pressure) and the external pressure (atmospheric pressure), and the outer housing 2 and the inner housing 3 are mechanically tensioned. The strength will increase. Therefore, it is possible to increase the rigidity of the vacuum double structure 1C.

Further, in the vacuum double structure 1C of the present embodiment, the plate thickness of the outer housing 2 and the inner housing 3 can be reduced, and the vacuum double structure 1C is provided between the outer housing 2 and the inner housing 3. The thickness (interval) of the vacuum layer 4 can also be reduced. Therefore, it is possible to reduce the size and weight of the vacuum double structure 1C.

When manufacturing the vacuum double structure 1C of the present embodiment, the same method as in the case of manufacturing the vacuum double structure 1A can be used. That is, after one open end side of the outer housing 2 and the inner housing 3 is joined by welding, the other open end of the outer housing 2 and the inner housing 3 is provided in the chamber decompressed to a high vacuum. The sides may be joined by brazing.

Specifically, first, it is formed in the gap S between the small-diameter cylindrical portion forming the other joint end portion 6 of the outer housing 2 and the small-diameter cylindrical portion of the inner housing 3 (the other of the outer housing 2). The brazing filler metal B is arranged in the groove portion 6b (provided on the distal end side of the peripheral wall 2c forming the joint end portion 6 and the peripheral wall 3c forming the other joint end portion 6 of the inner housing 3).

Then, after the outer housing 2 and the inner housing 3 are installed in the chamber with the other opening end side facing upward, the inside of the chamber is depressurized (evacuated) to a high vacuum. Then, the vacuum double structure 1C is heated in this chamber.

As a result, the brazing filler metal B melts, accumulates in the groove portion 6b, and penetrates into the gap S due to a capillary phenomenon. Then, after the heating is completed, the peripheral walls 2c and 3c of each other are joined over the entire circumference via the hardened brazing filler metal B. The brazing material is not only between the small-diameter cylindrical portion of the inner housing 3 and the small-diameter cylindrical portion of the outer housing 2, but also between the small-diameter cylindrical portion of the inner housing 3 and the tapered portion of the outer housing. It may penetrate to.

When the other open end side of the outer housing 2 and the inner housing 3 is joined by brazing, the radial gap portion 7 is formed in the same manner as in the case of manufacturing the vacuum double structure 1A described above. The brazing material B is placed on at least one of the inner peripheral wall of the outer housing 2 and the outer peripheral wall of the inner housing 3, and the inside of the chamber is depressurized to a high vacuum with the other opening end side facing downward, and then heated. It is also possible to use a method of infiltrating the molten brazing material into the gap S.

As described above, it is not necessary to provide a degassing hole on the side wall of the outer housing 2 and press-process the degassing hole as in the conventional case, and by going through the above-mentioned simple step, the present embodiment can be used. It is possible to manufacture the vacuum double structure 1C with good yield. Further, by installing a plurality of the vacuum double structures 1C before the other open end side is joined in the chamber, it is possible to collectively manufacture the plurality of vacuum double structures 1C.

(Fourth Embodiment)
Next, as a fourth embodiment of the present invention, for example, the vacuum double structure 1D shown in FIGS. 5A to 5D will be described. 5A and 5B show the configuration of the vacuum double structure 1D, FIG. 5A is a cross-sectional view thereof, FIG. 5B is a side view thereof, FIG. 5C is a front view seen from one end side thereof, and FIG. 5D is a front view thereof. It is a front view seen from the other end side. Further, in the following description, the same parts as those of the vacuum double structure 1A will be omitted and the same reference numerals will be given in the drawings.

As shown in FIGS. 5A to 5D, the vacuum double structure 1D of the present embodiment is basically different from the vacuum double structure 1A except that the shape of the other joint end portion 6 is different. It has the same configuration.

That is, the outer housing 2 has a large-diameter cylindrical portion, a small-diameter cylindrical portion having a smaller diameter, a tapered portion provided so as to gently connect the large-diameter cylindrical portion and the small-diameter cylindrical portion, and a small-diameter cylinder. It is provided with a tapered portion that gradually expands in diameter from the portion. The open end of the tapered portion whose diameter is expanded from the small diameter cylindrical portion is the other joint end portion 6.
The inner housing 3 includes a large-diameter cylindrical portion, a small-diameter cylindrical portion having a smaller diameter, and a tapered portion that connects the large-diameter cylindrical portion and the small-diameter cylindrical portion. The open end of the small-diameter cylindrical portion is the other joint end portion 6.
A gap S is provided over the entire circumference between the inner peripheral wall of the small-diameter cylindrical portion of the outer housing 2 and the outer peripheral wall of the small-diameter cylindrical portion of the inner housing 3. Further, since the outer housing 2 is provided with a tapered portion whose diameter is expanded from the small diameter cylindrical portion, a groove portion 6b is formed at the other joint end portion 6 (in other words, the groove portion 6b is outside. It is provided on the distal end side of the peripheral wall 2c forming the other joint end portion 6 of the housing 2 and the peripheral wall 3c forming the other joint end portion 6 of the inner housing 3).

In the vacuum double structure 1D of the present embodiment having the above structure, it is not necessary to provide the degassing hole in the outer housing 2 or press the degassing hole as in the conventional case, and the radial gap portion is provided. It is possible to make the thickness of the vacuum layer 4 forming 7 uniform in the circumferential direction. As a result, tension is always applied to the outer housing 2 and the inner housing 3 due to the difference between the internal pressure (vacuum pressure) and the external pressure (atmospheric pressure), and the outer housing 2 and the inner housing 3 are mechanically tensioned. The strength will increase. Therefore, it is possible to increase the rigidity of the vacuum double structure 1D.

Further, in the vacuum double structure 1D of the present embodiment, the plate thickness of the outer housing 2 and the inner housing 3 can be reduced, and the vacuum double structure 1D is provided between the outer housing 2 and the inner housing 3. The thickness (interval) of the vacuum layer 4 can also be reduced. Therefore, it is possible to reduce the size and weight of the vacuum double structure 1D.

When manufacturing the vacuum double structure 1D of the present embodiment, the same method as in the case of manufacturing the vacuum double structure 1A can be used.
That is, first, the peripheral walls 2b and 3b forming the one end portion 5 of the outer housing 2 and the inner housing 3 are joined by welding.
That is, the large-diameter cylindrical portion of the outer housing 2 and the large-diameter cylindrical portion of the inner housing 3 are arranged so as to overlap in the radial direction, and the open ends of both are flush with each other. By joining the tips of both by welding, one joint end portion 5 of the vacuum double structure 1D is formed.
Next, in the chamber decompressed to a high vacuum, the peripheral walls 2c and 3c forming the other joint end 6 between the outer housing 2 and the inner housing 3 may be joined by brazing with the brazing material B.

Specifically, first, the peripheral wall 2c forming the tapered portion of the outer housing 2 and the small-diameter cylindrical portion of the inner housing 3 (the peripheral wall 2c forming the other joint end portion 6 of the outer housing 2) and the inner housing The brazing filler metal B is arranged in the groove portion 6b (provided on the distal end side with the peripheral wall 3c forming the other joint end portion 6 of 3).

Then, after the outer housing 2 and the inner housing 3 are installed in the chamber with the other opening end side facing upward, the inside of the chamber is depressurized (evacuated) to a high vacuum. After that, the outer housing 2 and the inner housing 3 are heated in this chamber.

As a result, the brazing filler metal B melts in the groove portion 6b and permeates into the gap S from the groove portion 6b due to a capillary phenomenon. Then, after the heating is completed, the peripheral wall 3c of the inner housing 3 and the peripheral wall 2c of the outer housing 2 are joined over the entire circumference via the hardened brazing material B.

When the other open end side of the outer housing 2 and the inner housing 3 is joined by brazing, the radial gap portion 7 is formed in the same manner as in the case of manufacturing the vacuum double structure 1A described above. After the brazing material B is placed on at least one of the inner peripheral surface of the outer housing 2 and the outer peripheral surface of the inner housing 3, the inside of the chamber is depressurized to a high vacuum with the other opening end side facing downward. It is also possible to use a method of infiltrating the brazed material melted by heating into the gap S.

As described above, it is not necessary to provide a degassing hole on the side wall of the outer housing 2 and press-process the degassing hole as in the conventional case, and by going through the above-mentioned simple step, the present embodiment can be used. It is possible to manufacture the vacuum double structure 1D with good yield. Further, by installing a plurality of the vacuum double structures 1D before the other open end side is joined in the chamber, it is possible to collectively manufacture the plurality of vacuum double structures 1D.

(Fifth Embodiment)
Next, as a fifth embodiment of the present invention, for example, the vacuum double structure 1E shown in FIGS. 6A to 6D will be described. 6A and 6B show the configuration of the vacuum double structure 1E, FIG. 6A is a cross-sectional view thereof, FIG. 6B is a side view thereof, FIG. 6C is a front view seen from one end side thereof, and FIG. 6D is a front view thereof. It is a front view seen from the other end side. Further, in the following description, the same parts as those of the vacuum double structure 1A will be omitted and the same reference numerals will be given in the drawings.

As shown in FIGS. 6A to 6D, the vacuum double structure 1E of the present embodiment has a different structure of the other joint end portion 6. The vacuum double structure 1E of the present embodiment is basically the same as the vacuum double structure 1A except that the outer housing 2 and the inner housing 3 are provided with the brazing receiving member 8. It has the same configuration.

The outer housing 2 includes a large-diameter cylindrical portion, a small-diameter cylindrical portion having a smaller diameter, and a tapered portion provided so as to gently connect the large-diameter cylindrical portion and the small-diameter cylindrical portion.
The inner housing 3 also includes a large-diameter cylindrical portion, a small-diameter cylindrical portion having a smaller diameter, and a tapered portion that connects the large-diameter cylindrical portion and the small-diameter cylindrical portion.
In the vacuum double structure 1E of the present embodiment, at the other joint end portion 6, the brazing material B that has penetrated into the gap S from between the outer housing 2 and the inner housing 3 forming the radial gap portion 7 is interposed. The small-diameter cylindrical portions, which are at least the peripheral wall portions of each other, are joined to each other, and the brazing receiving member 8 is attached to the tips of the small-diameter cylindrical portions via the brazing filler metal B.
The brazing filler metal B may penetrate into the tapered portion of the outer housing 2.
The brazing receiving member 8 is, for example, a metal shim-shaped plate (foil-shaped) such as copper foil, and the outer periphery of the outer housing 2 sandwiches a portion facing the other opening end so that the brazing filler metal B melted during heating collects. It has a folded shape on the side and the inner peripheral side of the inner housing 3.

In the vacuum double structure 1E of the present embodiment, by forming the other joint end portion 6 in such a configuration, it is possible to increase the joint strength at the other joint end portion 6.

In the vacuum double structure 1E of the present embodiment having the above-mentioned structure, it is not necessary to provide a degassing hole on the side wall of the outer housing 2 or press the degassing hole as in the conventional case, and it is radial. It is possible to make the thickness of the vacuum layer 4 forming the gap portion 7 uniform in the circumferential direction. As a result, tension is always applied to the outer housing 2 and the inner housing 3 due to the difference between the internal pressure (vacuum pressure) and the external pressure (atmospheric pressure), and the outer housing 2 and the inner housing 3 are mechanically tensioned. The strength will increase. Therefore, it is possible to increase the rigidity of the vacuum double structure 1E.

Further, in the vacuum double structure 1E of the present embodiment, the plate thickness of the outer housing 2 and the inner housing 3 can be reduced, and the vacuum double structure 1E is provided between the outer housing 2 and the inner housing 3. The thickness (interval) of the vacuum layer 4 can also be reduced. Therefore, it is possible to reduce the size and weight of the vacuum double structure 1E.

When manufacturing the vacuum double structure 1E of the present embodiment, the same method as in the case of manufacturing the vacuum double structure 1A can be used. That is, after one open end side of the outer housing 2 and the inner housing 3 is joined by welding, the other open end of the outer housing 2 and the inner housing 3 is provided in the chamber decompressed to a high vacuum. The sides may be joined by brazing.

Next, the outer housing 2 and the inner housing 3 are joined by brazing with the other open end side of the outer housing 2 and the inner housing 3 by the brazing material B stored inside the brazing receiving member 8.

Specifically, the step of joining the other open end side by brazing will be described with reference to FIG. 7. Note that FIG. 7 is a diagram for explaining the manufacturing process of the vacuum double structure 1E, and is a cross section showing a state in which the outer housing 2 and the inner housing 3 are joined by brazing on the other open end side. It is a figure.

First, the brazing filler metal B is arranged in advance on the brazing filler metal receiving member 8. The brazing filler metal B may be arranged in advance on at least one of the inner peripheral surface of the outer housing 2 forming the radial gap portion 7 and the outer peripheral surface of the inner housing 3.

When the other open end side is joined by brazing, as shown in FIG. 7, the peripheral wall 2c of the outer housing 2 forming the other joint end 6 and the inner casing forming the other joint end 6 are formed. The peripheral wall 3c of the body 3 is arranged with a gap S provided in the radial direction, and the brazing member 8 containing the brazing material B is arranged facing the other opening end.

At this time, it is necessary that the tip surfaces of the peripheral walls 2c and 3c of each other are aligned at the other open end. After joining one open end side by welding, it is possible to cut and align the other open end side of the outer housing 2 and the inner housing 3 by cutting. As a result, it is possible to align the tip surfaces of the peripheral walls 2c and 3c with each other at the other opening end without worrying about the dimensional accuracy of the other opening end side of the outer housing 2 and the inner housing 3. , It is possible to simplify the manufacturing process.

Then, with the other open end side facing downward, the outer housing 2, the inner housing 3, and the brazing receiving member 8 are installed in the chamber, and then the inside of the chamber is depressurized (evacuated) to a high vacuum. .. After that, the outer housing 2, the inner housing 3, and the brazing receiving member 8 are heated in this chamber.

As a result, the brazing material B melts, and the brazing material B accumulated inside the brazing receiving member 8 permeates into the gap S due to the capillary phenomenon. Then, after the heating is completed, at least the small-diameter cylindrical portions of each other are joined to each other over the entire circumference via the hardened brazing filler metal B. Further, the brazing receiving member 8 is in a state of being attached to the other open end. Thereby, the other open end side can be reliably sealed by the brazing receiving member 8.
Further, when the brazing material B is stored inside the brazing receiving member 8 and the other open end side of the outer housing 2 and the inner housing 3 is joined by brazing, the brazing material B is prevented from falling. At the same time, it is possible to easily check the state after brazing.

After joining the other joint end portion 6, an unnecessary portion of the brazing receiving member 8 is removed from the portion attached to the other open end. This makes it possible to fabricate the vacuum double structure 1E.

As for the brazing member 8, it is not always necessary to remove an unnecessary portion after brazing, and such a step can be omitted. In this case, it is preferable to use one in which the width of the bottom surface portion of the brazing receiving member 8 is the sum of the thickness of the outer housing 2, the thickness of the inner housing 3, and the gap S. Further, the brazing receiving member 8 may be used as a pedestal for installing the vacuum double structure 1E in the chamber.
The brazing member 8 can be completely removed after brazing.

Further, when joining the other open end side by brazing, the method is limited to the method of arranging the brazing receiving member 8 facing the other open end with the other open end side facing downward. It is also possible to arrange the brazing receiving member 8 at the other opening end with the other opening end facing upward. In this case, a slit may be provided on the bottom surface of the brazing receiving member 8 so that the brazing material B melted in the brazing receiving member 8 flows into the other opening end side through the slit.

As described above, it is not necessary to provide a degassing hole on the side wall of the outer housing 2 and press-process the degassing hole as in the conventional case, and by going through the above-mentioned simple step, the present embodiment can be used. It is possible to manufacture the vacuum double structure 1E with good yield. Further, by installing a plurality of the vacuum double structures 1E before the other open end side is joined in the chamber, it is possible to collectively manufacture the plurality of vacuum double structures 1E.

(Sixth Embodiment)
Next, as a sixth embodiment of the present invention, for example, the vacuum double structure 1F shown in FIGS. 8A to 8D will be described. 8A and 8B show the configuration of the vacuum double structure 1F, (A) is a cross-sectional view thereof, (B) is a side view thereof, (C) is a front view seen from one end side thereof, and (D) is a front view thereof. It is a front view seen from the other end side. Further, in the following description, the same parts as those of the vacuum double structure 1A will be omitted and the same reference numerals will be given in the drawings.

As shown in FIGS. 8A to 8D, the vacuum double structure 1F of the present embodiment is basically different from the vacuum double structure 1A except that the configuration of the other joint end portion 6 is different. It has the same configuration.

The inner housing 3 included in the vacuum double structure 1A includes a large-diameter cylindrical portion, a small-diameter cylindrical portion having a smaller diameter, and a tapered portion for connecting the large-diameter cylindrical portion and the small-diameter cylindrical portion. do.
The outer housing 2 includes a cylindrical portion and a wax receiving portion 2r provided at the lower end of the cylindrical portion. The brazing receiving portion 2r has an upward concave shape that is folded back toward the inner peripheral side of the small-diameter cylindrical portion of the inner housing 3. The tip of the small-diameter cylindrical portion of the inner housing 3 is in contact with the flat bottom surface portion of the recess.

In the vacuum double structure 1F of the present embodiment, the other joint end portion 6 has such a configuration, so that when the inner housing 3 is housed inside the outer housing 2, the open ends of each other are used. Alignment is easy. Further, it is possible to increase the mechanical strength (rigidity) at the other joint end portion 6.

In the vacuum double structure 1F of the present embodiment having the above-mentioned structure, it is not necessary to provide a degassing hole on the side wall of the outer housing 2 or press the degassing hole as in the conventional case, and it is radial. It is possible to make the thickness of the vacuum layer 4 forming the gap portion 7 uniform in the circumferential direction. As a result, tension is always applied to the outer housing 2 and the inner housing 3 due to the difference between the internal pressure (vacuum pressure) and the external pressure (atmospheric pressure), and the outer housing 2 and the inner housing 3 are mechanically tensioned. The strength will increase. Therefore, it is possible to increase the rigidity of the vacuum double structure 1F.

Further, in the vacuum double structure 1F of the present embodiment, the plate thickness of the outer housing 2 and the inner housing 3 can be reduced, and the vacuum double structure 1F is provided between the outer housing 2 and the inner housing 3. The thickness (interval) of the vacuum layer 4 can also be reduced. Therefore, it is possible to reduce the size and weight of the vacuum double structure 1F.

When manufacturing the vacuum double structure 1F of the present embodiment, the same method as in the case of manufacturing the vacuum double structure 1A can be used.
That is, after one open end side of the outer housing 2 and the inner housing 3 is joined by welding, the other open end of the outer housing 2 and the inner housing 3 is provided in the chamber decompressed to a high vacuum. The sides may be joined by brazing.

In order to form the other open end, first, the brazing material B is stored in the brazing receiving portion 2r located inside the inner housing 3. The brazing material B can also be arranged in advance between the outer housing 2 and the inner housing 3 that form the radial gap portion 7.

Next, the peripheral wall 3c forming the other joint end portion 6 of the inner housing 3 is arranged on the bottom surface portion of the wax receiving portion 2r in a state of being butted in the axial direction.

Then, with the other opening end side facing downward, the outer housing 2 and the inner housing 3 are installed in the chamber, and then the inside of the chamber is depressurized (evacuated) to a high vacuum. Then, the inside of this chamber is heated.

As a result, the molten brazing material B is accumulated in the brazing receiving portion 2r and spreads over the entire circumference of the inner wall of the inner housing 3. After the heating is completed, the small-diameter cylindrical portion of the inner housing 3 and the brazing receiving portion of the outer housing 2 are joined to each other over the entire circumference via the hardened brazing material B.
If the brazing material B is stored inside the brazing receiving portion 2r and the other joint end portion 6 between the outer housing 2 and the inner housing 3 is joined by brazing, the brazing material B will fall. While preventing it, it is possible to easily check the state after brazing.

As described above, it is not necessary to provide a degassing hole on the side wall of the outer housing 2 and press-process the degassing hole as in the conventional case, and by going through the above-mentioned simple step, the present embodiment can be used. It is possible to manufacture the vacuum double structure 1F with good yield. Further, by installing a plurality of the vacuum double structures 1F before the other open end side is joined in the chamber, it is possible to collectively manufacture the plurality of vacuum double structures 1F.

(7th Embodiment)
Next, as a seventh embodiment of the present invention, for example, the vacuum double structure 1G shown in FIGS. 9A to 9D will be described. 9A and 9B show the configuration of the vacuum double structure 1G, (A) is a cross-sectional view thereof, (B) is a side view thereof, (C) is a front view seen from one end side thereof, and (D) is a front view thereof. It is a front view seen from the other end side. Further, in the following description, the same parts as those of the vacuum double structure 1A will be omitted and the same reference numerals will be given in the drawings.

As shown in FIGS. 9A to 9D, the vacuum double structure 1G of the present embodiment is basically different from the vacuum double structure 1A except that the configuration of the other joint end portion 6 is different. It has the same configuration.

The inner housing 3 includes a large-diameter cylindrical portion, a small-diameter cylindrical portion having a smaller diameter, and a tapered portion that connects the large-diameter cylindrical portion and the small-diameter cylindrical portion.
The outer housing 2 includes a cylindrical portion and a wax receiving portion 2r provided at the lower end of the cylindrical portion. The wax receiving portion 2r is folded back toward the inner peripheral side of the small-diameter cylindrical portion of the inner housing 3 and has a concave shape. The peripheral end 2d located inside the inner housing of the brazing receiving portion 2r forms the other opening portion 6a. Further, the tip of the small-diameter cylindrical portion of the inner housing 3 comes into contact with the flat bottom surface portion of the concave portion of the wax receiving portion 2r.
Then, in the other joint end portion 6, the inner portion forming the other joint end portion via the brazing material B accumulated in the brazing receiving portion 2r from between the outer housing 2 forming the radial gap portion 7 and the inner housing portion 3. The peripheral wall 3c of the housing 3 and the peripheral wall 2c of the outer housing 2 are joined.
More specifically, the brazing receiving portion 2r of the outer housing 2 and the small-diameter cylindrical portion of the inner housing 3 are joined.

In the vacuum double structure 1G of the present embodiment, the other joint end portion 6 has such a configuration, so that when the inner housing 3 is housed inside the outer housing 2, the open ends 6 of each other are accommodated. Alignment is easy. Further, it is possible to increase the mechanical strength (rigidity) at the other joint end portion 6.

In the vacuum double structure 1G of the present embodiment having the above structure, it is not necessary to provide a degassing hole on the side wall of the outer housing 2 or press the degassing hole as in the conventional case, and it is radial. It is possible to make the thickness of the vacuum layer 4 forming the gap portion 7 uniform in the circumferential direction. As a result, tension is always applied to the outer housing 2 and the inner housing 3 due to the difference between the internal pressure (vacuum pressure) and the external pressure (atmospheric pressure), and the outer housing 2 and the inner housing 3 are mechanically tensioned. The strength will increase. Therefore, it is possible to increase the rigidity of this vacuum double structure 1G.

Further, in the vacuum double structure 1G of the present embodiment, the plate thickness of the outer housing 2 and the inner housing 3 can be reduced, and the vacuum double structure 1G is provided between the outer housing 2 and the inner housing 3. The thickness (interval) of the vacuum layer 4 can also be reduced. Therefore, it is possible to reduce the size and weight of the vacuum double structure 1G.

When manufacturing the vacuum double structure 1G of the present embodiment, the same method as in the case of manufacturing the vacuum double structure 1A can be used. That is, after one open end side of the outer housing 2 and the inner housing 3 is joined by welding, the other open end of the outer housing 2 and the inner housing 3 is provided in the chamber decompressed to a high vacuum. The sides may be joined by brazing.

Further, when manufacturing the vacuum double structure 1G of the present embodiment, the outer housing 2 is in a state where the brazing material B between the outer housing 2 and the inner housing 3 forming the radial gap portion 7 is stored. And the other open end side of the inner housing 3 are joined by brazing.

Specifically, first, the brazing material B is first arranged in, for example, a small-diameter cylindrical portion of the inner housing 3. Next, the tip of the small-diameter cylindrical portion of the inner housing 3 is arranged in a state where the tip of the small-diameter cylindrical portion of the inner housing 3 is abutted in the axial direction on the flat bottom surface portion which is the recess of the brazing receiving portion of the outer housing 2.

Then, with the other end side facing downward, the vacuum double structure 1G before the other end side is joined is installed in the chamber, and then the inside of the chamber is depressurized (evacuated) to a high vacuum. do. Then, the vacuum double structure 1G is heated in this chamber.

As a result, the molten brazing material B flows into the other opening end side and is in a state of being accumulated in the brazing receiving portion. After the heating is completed, the brazing receiving portion of the outer housing 2 and the small-diameter cylindrical portion of the inner housing 3 are joined to each other over the entire circumference via the hardened brazing material B.
In this way, when the brazing material B is stored inside the brazing receiving portion 2r and the other open end side of the outer housing 2 and the inner housing 3 is joined by brazing, the brazing material B falls. Can be prevented.

As described above, it is not necessary to provide a degassing hole on the side wall of the outer housing 2 and press-process the degassing hole as in the conventional case, and by going through the above-mentioned simple step, the present embodiment can be used. It is possible to manufacture the vacuum double structure 1G with good yield. Further, by installing a plurality of the vacuum double structures 1G before the other open end side is joined in the chamber, it is possible to collectively manufacture the plurality of vacuum double structures 1G.

(8th Embodiment)
Next, as an eighth embodiment of the present invention, for example, the vacuum double structure 1H shown in FIGS. 10A to 10D will be described. 10A and 10B show the configuration of the vacuum double structure 1H, (A) is a cross-sectional view thereof, (B) is a side view thereof, (C) is a front view seen from one end side thereof, and (D) is a front view thereof. It is a front view seen from the other end side. Further, in the following description, the same parts as those of the vacuum double structure 1A will be omitted and the same reference numerals will be given in the drawings.

As shown in FIGS. 10A to 10D, the vacuum double structure 1H of the present embodiment is basically different from the vacuum double structure 1A except that the configuration of the other joint end portion 6 is different. It has the same configuration.

The outer housing 2 is composed of a cylindrical portion.
The inner housing 3 includes a large-diameter cylindrical portion, a small-diameter cylindrical portion having a smaller diameter, a tapered portion connecting the large-diameter cylindrical portion and the small-diameter cylindrical portion, and a brazing receiving portion 3r provided on the small-diameter cylindrical portion. Equipped with. The brazing receiving portion 3r includes a bottom surface portion provided at the lower end of the small-diameter cylindrical portion of the inner housing 3 and a flange portion rising from the outer periphery of the bottom surface portion. The bottom surface portion is located substantially at right angles to the small diameter cylindrical portion, and is provided over the entire circumference of the small diameter cylindrical portion.

The cylindrical portion of the outer housing 2 and the large-diameter cylindrical portion of the inner housing 3 are arranged so as to be in contact with each other in the radial direction and their tips are flush with each other. Then, the flush tips are joined by welding, and one of the joint ends 5 is formed.
The cylindrical portion of the outer housing 2 and the brazing receiving portion 3r of the inner housing 3 are joined via the brazing material B accumulated in the brazing receiving portion 3r located on the outer peripheral side of the outer housing 2, and the other is joined. The end 6 is formed.

In the vacuum double structure 1H of the present embodiment, the other joint end portion 6 has such a configuration, so that when the outer housing 2 is arranged on the outside of the inner housing 3, the open ends of each other are used. Alignment is easy. Further, it is possible to increase the mechanical strength (rigidity) at the other joint end portion 6.

In the vacuum double structure 1H of the present embodiment having the above-mentioned structure, it is not necessary to provide a degassing hole on the side wall of the outer housing 2 or press the degassing hole as in the conventional case, and it is radial. It is possible to make the thickness of the vacuum layer 4 forming the gap portion 7 uniform in the circumferential direction. As a result, tension is always applied to the outer housing 2 and the inner housing 3 due to the difference between the internal pressure (vacuum pressure) and the external pressure (atmospheric pressure), and the outer housing 2 and the inner housing 3 are mechanically tensioned. The strength will increase. Therefore, it is possible to increase the rigidity of the vacuum double structure 1H.

Further, in the vacuum double structure 1H of the present embodiment, the plate thickness of the outer housing 2 and the inner housing 3 can be reduced, and the vacuum double structure 1H is provided between the outer housing 2 and the inner housing 3. The thickness (interval) of the vacuum layer 4 can also be reduced. Therefore, it is possible to reduce the size and weight of the vacuum double structure 1H.

When manufacturing the vacuum double structure 1H of the present embodiment, the same method as in the case of manufacturing the vacuum double structure 1A can be used. That is, after one open end side of the outer housing 2 and the inner housing 3 is joined by welding, the other open end of the outer housing 2 and the inner housing 3 is provided in the chamber decompressed to a high vacuum. The side peripheral walls 2c and 3c may be joined by brazing.

Specifically, first, the brazing material B is arranged in advance on the brazing receiving portion 3r. In FIG. 10, the brazing filler metal B is arranged on the brazing receiving portion 3r located on the outer side of the outer housing 2, but the brazing material B is arranged in advance between the outer housing 2 and the inner housing 3 forming the radial gap portion 7. It is also possible to keep it.
Next, the outer housing 2 is arranged in a state of being butted in the axial direction with respect to the bottom surface portion of the brazing receiving portion 3r of the inner housing 3.
As shown in FIG. 10, when the brazing material B is arranged on the brazing receiving portion 3r located outside the outer housing 2, the outer housing 2 and the inner housing 3 are arranged in a state of being butted against each other. , Wax can also be placed.

Then, with the other opening end side facing downward, the inner housing 3 and the outer housing 2 are installed in the chamber, and then the inside of the chamber is depressurized (evacuated) to a high vacuum. Then, the vacuum double structure 1H is heated in this chamber.

As a result, the molten brazing material B is accumulated in the brazing receiving portion 3r and spreads over the entire circumference of the outer housing 2. Then, after the heating is completed, the peripheral walls 2c and 3c of the outer housing 2 and the inner housing are joined over the entire circumference via the cured brazing material B.
Further, when the brazing material B is stored in the brazing receiving portion and the other open end side of the outer housing 2 and the inner housing 3 is joined by brazing, the brazing material B is prevented from falling and the brazing material B is brazed. It is possible to easily check the state after attachment.

As described above, it is not necessary to provide a degassing hole on the side wall of the outer housing 2 and press-process the degassing hole as in the conventional case, and by going through the above-mentioned simple step, the present embodiment can be used. It is possible to manufacture the vacuum double structure 1H with good yield. Further, by installing a plurality of the vacuum double structures 1H before the other open end side is joined in the chamber, it is possible to collectively manufacture the plurality of vacuum double structures 1H.

(9th embodiment)
Next, as a ninth embodiment of the present invention, for example, the vacuum double structure 1I shown in FIGS. 11A to 11D will be described. 11A and 11B show the configuration of the vacuum double structure 1I, (A) is a cross-sectional view thereof, (B) is a side view thereof, (C) is a front view seen from one end side thereof, and (D) is a front view thereof. It is a front view seen from the other end side. Further, in the following description, the same parts as those of the vacuum double structure 1A will be omitted and the same reference numerals will be given in the drawings.

As shown in FIGS. 11A to 11D, the vacuum double structure 1I of the present embodiment has the above-mentioned vacuum double structure except that the configurations of one joint end 5 and the other joint end 6 are different. It has basically the same structure as the structure 1A.

The outer housing 2 includes a small-diameter cylindrical portion, a large-diameter cylindrical portion, and a tapered portion that gently connects the small-diameter cylindrical portion and the large-diameter cylindrical portion.
The inner housing 3 includes a cylindrical portion and a brazing receiving portion 3r provided at the lower end of the cylindrical portion. The wax receiving portion 3r is provided in contact with the tip of the large-diameter cylindrical portion of the outer housing 2 and has a concave saucer shape, and the outer peripheral end thereof is outside the large-diameter cylindrical portion of the outer housing 2. Located in.

In the vacuum double structure 1I, a cylindrical peripheral wall 2b forming one joint end portion 5 of the outer housing 2 and a cylindrical peripheral wall 3b forming one joint end portion 5 of the inner housing 3 are provided. They are arranged so as to overlap in the radial direction. Then, at one of the joint end portions 5, the tips of the peripheral walls 2b and 3b (the open ends of the outer housing 2 and the inner housing 3) are joined by welding.
More specifically, in the vacuum double structure 1I, the small-diameter cylindrical portion of the outer housing 2 and the cylindrical portion of the inner housing 3 are radially overlapped with each other and their tips are flush with each other. Have been placed. Then, the tip of the small-diameter cylindrical portion of the outer housing 2 and the tip of the cylindrical portion of the inner housing 3 (open ends of the outer housing 2 and the inner housing 3) are joined by welding, and one of the joint ends is joined. Form part 5.

In the vacuum double structure 1I, the large-diameter cylindrical portion of the outer housing 2 and the brazing receiving portion of the inner housing 3 are joined via the brazing material B accumulated in the brazing receiving portion, and the other joint end portion is joined. Form 6.

In the vacuum double structure 1I of the present embodiment, the other joint end portion 6 has such a configuration, so that when the inner housing 3 is housed inside the outer housing 2, the open ends 6 of each other are accommodated. Alignment is easy. Further, it is possible to increase the mechanical strength (rigidity) at the other joint end portion 6.

In the vacuum double structure 1I of the present embodiment having the above-mentioned structure, it is not necessary to provide a degassing hole on the side wall of the outer housing 2 or press the degassing hole as in the conventional case, and it is radial. It is possible to make the thickness of the vacuum layer 4 forming the gap portion 7 uniform in the circumferential direction. As a result, tension is always applied to the outer housing 2 and the inner housing 3 due to the difference between the internal pressure (vacuum pressure) and the external pressure (atmospheric pressure), and the outer housing 2 and the inner housing 3 are mechanically tensioned. The strength will increase. Therefore, it is possible to increase the rigidity of the vacuum double structure 1I.

Further, in the vacuum double structure 1I of the present embodiment, the plate thickness of the outer housing 2 and the inner housing 3 can be reduced, and the vacuum double structure 1I is provided between the outer housing 2 and the inner housing 3. The thickness (interval) of the vacuum layer 4 can also be reduced. Therefore, it is possible to reduce the size and weight of the vacuum double structure 1I.

When manufacturing the vacuum double structure 1I of the present embodiment, the same method as in the case of manufacturing the vacuum double structure 1A can be used. That is, after one open end side of the outer housing 2 and the inner housing 3 is joined by welding, the other open end of the outer housing 2 and the inner housing 3 is provided in the chamber decompressed to a high vacuum. The sides may be joined by brazing.

Specifically, first, the tip of the large-diameter cylindrical portion of the outer housing 2 is arranged in the brazing receiving portion 3r of the inner housing 3 in a state of being abutted in the axial direction.

Next, the brazing material B is arranged on the outside of the outer housing 2 of the brazing receiving portion 3r. The brazing material B can be arranged in the above-mentioned place in advance before the inner housing 3 and the outer housing 2 are arranged, and the outer housing 2 and the inner housing 2 forming the radial gap portion 7 can be arranged in advance. It is also possible to arrange it in advance between 3 and 3.

Then, with the other end side facing downward, the vacuum double structure 1I before the other end side is joined is installed in the chamber, and then the inside of the chamber is depressurized (evacuated) to a high vacuum. do. Then, the vacuum double structure 1I is heated in this chamber.

As a result, the molten brazing material B is accumulated in the brazing receiving portion 3r and spreads over the entire circumference of the outer housing 2. After the heating is completed, the large-diameter cylindrical portion of the outer housing 2 and the brazing receiving portion of the inner housing 3 are joined to each other over the entire circumference via the hardened brazing material B.
When the outer housing 2 and the inner housing 3 are joined by brazing with the brazing material B stored in the brazing receiving portion, the brazing material B is prevented from falling and the state after brazing can be easily confirmed. It is possible to do.

As described above, it is not necessary to provide a degassing hole on the side wall of the outer housing 2 and press-process the degassing hole as in the conventional case, and by going through the above-mentioned simple step, the present embodiment can be used. It is possible to manufacture the vacuum double structure 1I with good yield. Further, by installing a plurality of the vacuum double structures 1I before the other open end side is joined in the chamber, it is possible to collectively manufacture the plurality of vacuum double structures 1I.

(10th Embodiment)
Next, as a tenth embodiment of the present invention, for example, the vacuum double structure 1J shown in FIGS. 12A to 12D will be described. 12A and 12B show the configuration of the vacuum double structure 1J, (A) is a cross-sectional view thereof, (B) is a side view thereof, (C) is a front view seen from one end side thereof, and (D) is a front view thereof. It is a front view seen from the other end side. Further, in the following description, the same parts as those of the vacuum double structure 1A will be omitted and the same reference numerals will be given in the drawings.

As shown in FIGS. 12A to 12D, the vacuum double structure 1J of the present embodiment has the above-mentioned vacuum double structure except that the configurations of one joint end 5 and the other joint end 6 are different. It has basically the same structure as the structure 1A.

The outer housing 2 includes a small-diameter cylindrical portion, a large-diameter cylindrical portion having a larger diameter, and a tapered portion that connects the small-diameter cylindrical portion and the large-diameter cylindrical portion.
The inner housing 3 includes a cylindrical portion and a brazing receiving portion 3r provided at the lower end of the cylindrical portion. The wax receiving portion 3r includes a bottom surface portion provided at the lower end of the cylindrical portion of the inner housing 3 and a flange portion rising from the outer periphery of the bottom surface portion. The bottom surface portion is located substantially at right angles to the cylindrical portion and is provided over the entire circumference of the small diameter cylindrical portion.

In the vacuum double structure 1J, a cylindrical peripheral wall 2b forming one joint end portion 5 of the outer housing 2 and a cylindrical peripheral wall 3b forming one joint end portion 5 of the inner housing 3 are provided. They are arranged so as to overlap in the radial direction. Then, at one of the joint end portions 5, the tips of the peripheral walls 2b and 3b (the open ends of the outer housing 2 and the inner housing 3) are joined by welding.
More specifically, in the vacuum double structure 1J, the small-diameter cylindrical portion of the outer housing 2 and the cylindrical portion of the inner housing 3 are radially overlapped with each other, and their tips are flush with each other. It is arranged like this. Then, the flush tips are joined by welding, and one of the joint ends 5 is formed.
At the other joint end portion 6, the peripheral walls 2c and 3c of each other are joined via the brazing filler metal B accumulated in the brazing receiving portion 3r.
More specifically, the large-diameter cylindrical portion of the outer housing 2 and the brazing receiving portion of the inner housing 3 are joined via the brazing material B accumulated in the brazing receiving portion 3r on the outer peripheral side of the outer housing 2. , The other joint end 6 is formed.
In this vacuum double structure 1J, since the inner housing 3 and the outer housing 2 have the above-mentioned shapes, the diameter of one opening 5a formed in a circular shape by one of the joint end portions 5 and the other The diameter of the other opening 6a formed in a circular shape by the joint end portion 6 is equal to that of the other opening 6a.

In the vacuum double structure 1J of the present embodiment, the other joint end portion 6 has such a configuration, so that when the inner housing 3 is housed inside the outer housing 2, the open ends 6 of each other are accommodated. Alignment is easy. Further, it is possible to increase the mechanical strength (rigidity) at the other joint end portion 6.

In the vacuum double structure 1J of the present embodiment having the above-mentioned structure, it is not necessary to provide a degassing hole on the side wall of the outer housing 2 or press the degassing hole as in the conventional case, and it is radial. It is possible to make the thickness of the vacuum layer 4 forming the gap portion 7 uniform in the circumferential direction. As a result, tension is always applied to the outer housing 2 and the inner housing 3 due to the difference between the internal pressure (vacuum pressure) and the external pressure (atmospheric pressure), and the outer housing 2 and the inner housing 3 are mechanically tensioned. The strength will increase. Therefore, it is possible to increase the rigidity of the vacuum double structure 1J.

Further, in the vacuum double structure 1J of the present embodiment, the plate thickness of the outer housing 2 and the inner housing 3 can be reduced, and the vacuum double structure 1J is provided between the outer housing 2 and the inner housing 3. The thickness (interval) of the vacuum layer 4 can also be reduced. Therefore, it is possible to reduce the size and weight of the vacuum double structure 1J.

When manufacturing the vacuum double structure 1J of the present embodiment, the same method as in the case of manufacturing the vacuum double structure 1A can be used. That is, after one open end side of the outer housing 2 and the inner housing 3 is joined by welding, the other open end of the outer housing 2 and the inner housing 3 is provided in the chamber decompressed to a high vacuum. The sides may be joined by brazing.

Further, when manufacturing the vacuum double structure 1J of the present embodiment, the other joint end portion 6 between the outer housing 2 and the inner housing 3 is held in a state where the brazing material B is stored in the brazing receiving portion 3r. Join by brazing.

Specifically, the tip of the large-diameter cylindrical portion of the outer housing 2 is arranged in the brazing receiving portion 3r of the inner housing 3 in a state of being abutted in the axial direction.

Next, the brazing material B is arranged on the brazing receiving portion 3r on the outer peripheral side of the outer housing 2. The brazing material B can be arranged in the above-mentioned place in advance before the inner housing 3 and the outer housing 2 are arranged, and the outer housing 2 and the inner housing 2 forming the radial gap portion 7 can be arranged in advance. It is also possible to arrange it in advance between 3 and 3.

Then, with the other opening end side facing downward, the inner housing 3 and the outer housing 2 are installed in the chamber, and then the inside of the chamber is depressurized (evacuated) to a high vacuum. Then, the vacuum double structure 1J is heated in this chamber.

As a result, the molten brazing material B spreads over the entire circumference of the brazing receiving portion 3r. After the heating is completed, the large-diameter cylindrical portion of the outer housing 2 and the brazing receiving portion of the inner housing 3 are joined to each other over the entire circumference via the hardened brazing material B.
When the brazing material B is stored in the brazing receiving portion and the other open end side of the outer housing 2 and the inner housing 3 is joined by brazing, the brazing material B is prevented from falling and after brazing. It is possible to easily check the state of.

As described above, it is not necessary to provide a degassing hole on the side wall of the outer housing 2 and press-process the degassing hole as in the conventional case, and by going through the above-mentioned simple step, the present embodiment can be used. It is possible to manufacture the vacuum double structure 1J with good yield. Further, by installing a plurality of the vacuum double structures 1J before the other open end side is joined in the chamber, it is possible to collectively manufacture the plurality of vacuum double structures 1J.

(11th Embodiment)
Next, as the eleventh embodiment of the present invention, for example, the vacuum double structure 1K shown in FIGS. 13A to 13D will be described. 13A and 13B show the configuration of the vacuum double structure 1K, (A) is a cross-sectional view thereof, (B) is a side view thereof, (C) is a front view seen from one end side thereof, and (D) is a front view thereof. It is a front view seen from the other end side. Further, in the following description, the same parts as those of the vacuum double structure 1A will be omitted and the same reference numerals will be given in the drawings.

As shown in FIGS. 13A to 13D, the vacuum double structure 1K of the present embodiment has the above-mentioned vacuum double structure except that the configurations of one joint end 5 and the other joint end 6 are different. It has basically the same structure as the structure 1A.

The outer housing 2 has a small-diameter cylindrical portion provided at both ends, a large-diameter cylindrical portion having a larger diameter than the small-diameter cylindrical portion provided between the small-diameter cylindrical portions, and a small-diameter cylindrical portion and a large-diameter cylindrical portion. It is provided with two tapered portions to be connected.
The inner housing 3 includes a cylindrical portion and a brazing receiving portion 3r provided at the lower end of the cylindrical portion. The wax receiving portion 3r includes a bottom surface portion provided at the lower end of the cylindrical portion of the inner housing 3 and a flange portion rising from the outer periphery of the bottom surface portion. The bottom surface portion is located substantially at right angles to the cylindrical portion and is provided over the entire circumference of the cylindrical portion.

In the vacuum double structure 1K, the cylindrical peripheral wall 2b forming one joint end portion 5 of the outer housing 2 and the cylindrical peripheral wall 3b forming one joint end portion 5 of the inner housing 3 are formed. They are arranged so as to overlap in the radial direction. Then, at one of the joint end portions 5, the tips of the peripheral walls 2b and 3b (the open ends of the outer housing 2 and the inner housing 3) are joined by welding.
More specifically, in the vacuum double structure 1K, a small-diameter cylindrical portion which is a cylindrical peripheral wall of the outer housing 2 forming one joint end portion 5 and an inner casing forming one joint end portion 5. It is arranged so that the cylindrical portion, which is the cylindrical peripheral wall of the body 3, overlaps in the radial direction and the tip thereof is flush with each other. Then, at one of the joint end portions 5, the small-diameter cylindrical portion and the tip of the cylindrical portion (open ends of the outer housing 2 and the inner housing 3) are joined by welding.

In the vacuum double structure 1K, a small-diameter cylindrical portion which is a cylindrical peripheral wall forming the other joint end portion 6 of the outer housing 2 and a cylindrical portion forming the other joint end portion 6 of the inner housing 3 are formed. A cylindrical portion, which is a peripheral wall, is arranged with a gap S in the radial direction.
At the other joint end portion 6, the small-diameter cylindrical portion of the outer housing 2 and the cylindrical portion of the inner housing 3 are joined via the brazing material B accumulated in the brazing receiving portion 3r.

In the vacuum double structure 1K of the present embodiment, the other joint end portion 6 has such a configuration, so that when the inner housing 3 is housed inside the outer housing 2, the open ends of each other are used. Alignment is easy. Further, it is possible to increase the mechanical strength (rigidity) at the other joint end portion 6.

In the vacuum double structure 1K of the present embodiment having the above-mentioned structure, it is not necessary to provide a degassing hole on the side wall of the outer housing 2 or press the degassing hole as in the conventional case, and it is radial. It is possible to make the thickness of the vacuum layer 4 forming the gap portion 7 uniform in the circumferential direction. As a result, tension is always applied to the outer housing 2 and the inner housing 3 due to the difference between the internal pressure (vacuum pressure) and the external pressure (atmospheric pressure), and the outer housing 2 and the inner housing 3 are mechanically tensioned. The strength will increase. Therefore, it is possible to increase the rigidity of this vacuum double structure 1K.

Further, in the vacuum double structure 1K of the present embodiment, the plate thickness of the outer housing 2 and the inner housing 3 can be reduced, and the vacuum double structure 1K is provided between the outer housing 2 and the inner housing 3. The thickness (interval) of the vacuum layer 4 can also be reduced. Therefore, it is possible to reduce the size and weight of the vacuum double structure 1K.

When manufacturing the vacuum double structure 1K of the present embodiment, the same method as in the case of manufacturing the vacuum double structure 1A can be used. That is, after one open end side of the outer housing 2 and the inner housing 3 is joined by welding, the other open end of the outer housing 2 and the inner housing 3 is provided in the chamber decompressed to a high vacuum. The sides may be joined by brazing.

Further, when manufacturing the vacuum double structure 1K of the present embodiment, the other open end side of the outer housing 2 and the inner housing 3 is brazed with the brazing material B stored in the brazing receiving portion. Join with.

That is, when the other open end side is joined by brazing, the other joint end of the outer housing 2 is relative to the brazing receiving portion 3r of the peripheral wall 3c forming the other joint end portion 6 of the inner housing 3. The small-diameter cylindrical portion of the peripheral wall 2c forming the portion 6 is arranged in a state of being butted in the axial direction.
More specifically, first, the tip of the small-diameter cylindrical portion on the other side of the outer housing 2 is arranged on the bottom surface of the brazing receiving portion of the inner housing 3 in a state of being abutted in the axial direction.
Next, the brazing material B is arranged on the brazing receiving portion 3r on the outer peripheral side of the outer housing 2. The brazing material B can be arranged in the above-mentioned place in advance before the inner housing 3 and the outer housing 2 are arranged, and the outer housing 2 and the inner housing 2 forming the radial gap portion 7 can be arranged in advance. It is also possible to arrange it in advance between 3 and 3.

Then, with the other opening end side facing downward, the inner housing 3 and the outer housing 2 are installed in the chamber, and then the inside of the chamber is depressurized (evacuated) to a high vacuum. Then, the vacuum double structure 1K is heated in this chamber.

As a result, the molten brazing material B accumulates in the brazing receiving portion and permeates into the gap S due to the capillary phenomenon. Then, after the heating is completed, the peripheral walls 2c and 3c of each other are joined over the entire circumference via the hardened brazing filler metal B. More specifically, the small-diameter cylindrical portion of the outer housing 2 and the cylindrical portion and the brazing receiving portion 3r of the inner housing 3 are joined over the entire circumference.
When the brazing material B is stored in the brazing receiving portion and the other open end side of the outer housing 2 and the inner housing 3 is joined by brazing, the brazing material B is prevented from falling and after brazing. It is possible to easily check the state of.

As described above, it is not necessary to provide the degassing hole in the outer housing 2 as in the conventional case and press the degassing hole, and by going through the above-mentioned simple step, the vacuum second of the present embodiment is used. It is possible to manufacture the heavy structure 1K with good yield. Further, by installing a plurality of the vacuum double structures 1K before the other open end side is joined in the chamber, it is possible to collectively manufacture the plurality of vacuum double structures 1K.

(12th Embodiment)
Next, as a twelfth embodiment of the present invention, for example, the headphone main body 11 included in the headphones 10 shown in FIGS. 14 and 15 will be described. Note that FIG. 14 is a perspective view showing the appearance of the headphone main body 11 included in the headphone 10. FIG. 15 is a cross-sectional view showing the configuration of the headphone main body 11.

As shown in FIGS. 14 and 15, the headphone 10 of the present embodiment is a canal type headphone (earphone) and substantially includes a pair of left and right headphone bodies 11. The pair of headphone bodies 11 have the same structure as each other except that they have a symmetrical structure.
Therefore, unless otherwise specified in the following description, the headphone main body 11 shown in FIGS. 14 and 15 will be described as an example.

The headphone main body 11 includes a speaker unit 12, a housing 13 arranged on the back side of the speaker unit 12, earpieces 14 arranged on the front side of the speaker unit 12, and a main body case 15 arranged on the back side of the housing 13. And have.

The speaker unit 12 converts an electric signal into vibration and emits sound, and the driving method thereof and the like are not particularly limited. Generally, the speaker unit 12 is a speaker including a magnetic circuit, a voice coil that is movable in a magnetic gap of the magnetic circuit, a diaphragm attached to the voice coil, and a frame that supports the magnetic circuit and the diaphragm. It is possible to emit sound by having the main body SP, supplying an electric signal to the voice coil, and vibrating the diaphragm in response to the electric signal.

The earpiece 14 is made of an elastic member such as silicone rubber, and can be attached to the headphone body 11 by inserting it into an ear canal (ear canal). The earpiece 14 is provided with a sound emitting hole 14a penetrating in the axial direction. The earpiece 14 is attached to the speaker unit 12 by inserting a sound emitting hole 14a into the tip of the speaker unit 12 (speaker main body SP).

In the headphone main body 11, the vacuum double structure 1A shown in FIG. 1 is used as the housing 13. Further, in the headphone main body 11, for example, as shown in FIG. 16, the vacuum double structure 1G shown in FIG. 9 can be used as the housing 13. Note that FIG. 16 is a cross-sectional view showing another configuration of the headphone main body 11.

In the headphone main body 11, by using such vacuum double structures 1A and 1G as the housing 13, it is possible to increase the rigidity of the housing 13. Further, it is possible to reduce the size and weight of the housing 13.

As shown in FIGS. 15 and 16, the speaker unit 12 is arranged with its back side facing the inside of the housing 13 and the opening on the front side of the housing 13 (one opening 5a) closed. Has been done.

Specifically, the speaker unit 12 is fitted on the inner surface of the inner housing 3 so as to form one of the joint end portions 5 and the radial gap portion 7 of the inner housing 3, and one of the outer peripheral surfaces thereof. It is attached in a state where the parts are in contact with each other over the entire circumference. As a result, the headphone body 11 integrally holds the speaker unit 12 with the outer housing 2 exposed to the outside.

Further, the headphone main body 11 is attached with the main body case 15 in a state where the opening on the back side of the housing 13 (the other opening 6a) is closed. Specifically, the joint end portion on the back surface side of the housing 13 (the other joint end portion 6) is fitted inside the fitting recess 15a provided on the front surface of the main body case 15.

In the headphone 10 of the present embodiment having the above configuration, the rigidity of the housing 13 can be increased by using the vacuum double structures 1A and 1G described above as the housing 13. This makes it possible to obtain headphones 10 having excellent acoustic reproducibility while suppressing unnecessary vibration transmitted from the speaker unit 12 to the housing 13.

Further, in the headphone 10 of the present embodiment, even if the inner housing 3 of the housing 13 vibrates due to the sound emitted from the back surface side of the speaker unit 12, the vacuum layer 4 transfers the inner housing 3 to the outer housing 2. Vibration propagation is blocked. Thereby, it is possible to further suppress the vibration propagating to the outside through the housing 13.

Further, in the headphone 10 of the present embodiment, the speaker unit 12 is housed 13 in a state where a part of the speaker unit 12 is in contact with the surface forming one of the joint end portions 5 and the radial gap portion 7 of the inner housing 3. It is attached to. Thereby, although it has a simple structure, it is possible to prevent unnecessary vibration from the speaker unit 12 from being transmitted to the housing 13. Further, the speaker unit 12 can be easily attached to the housing 13, and the number of parts and the assembling man-hours can be reduced.

The headphone 10 of the present embodiment is connected to, for example, an audio device or a digital device such as a personal computer or a smartphone via a headphone cable (not shown) electrically connected to the headphone body 11. , It is possible to listen to music played on these devices. Further, the present invention is not necessarily limited to such a configuration, and for example, by adding a wireless communication function conforming to a short-range wireless standard such as Bluetooth (registered trademark), a device having this wireless communication function or the like can be used. It is also possible to listen to the played music wirelessly.

In addition to the canal type headphones (earphones) 10 described above, the headphone form is, for example, an overhead type headphone in which a pair of headphone bodies are connected via a headband, or a clip attached to the headphone body. Earphones that can be worn by hooking on the ear ring, neckband type headphones that connect a pair of headphone bodies from the back of the neck via a neckband, and inner ear type that can be worn by hooking on the ear beads. Headphones (earphones) and the like can be mentioned.

Further, it may be a one-ear type headphone having only one of the left and right headphone bodies. Further, like a headset, the headphone body on either the left or right side and the microphone may be combined.

The present invention is not necessarily limited to that of the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
That is, the external shape of the vacuum double structure is not particularly limited, and can be appropriately changed according to the size, design, and the like.

Further, in the above embodiment, the case where the vacuum double structure is applied to the headphone housing is illustrated, but the use of the vacuum double structure is not particularly limited, and such a vacuum double structure is not particularly limited. It can be widely used for those to which the structure is applicable.

1A-1K ... Vacuum double structure, 2 ... Outer housing, 2b ... Peripheral wall (peripheral wall) forming one open end, 2c ... Peripheral wall (peripheral wall) forming the other open end, 2r ... Brazing receiver, 3 ... Inner housing, 3b ... Peripheral wall (peripheral wall) forming one open end, 3c ... Peripheral wall (peripheral wall) forming the other open end, 3r ... Brazing receiver, 4 ... Vacuum layer, 5 ... One joint Ends, 5a ... one opening, 6 ... the other joint end, 6a ... the other opening, 6b ... grooves, 7 ... radial gaps, 8 ... brazing member, 10 ... headphones, 11 ... headphone body, 12 ... Speaker unit, 13 ... Housing, 14 ... Earpiece, 15 ... Body case, B ... Brazing material (brazing joint), S ... Gap, W ... Welded joint

Claims (15)

It has a metal outer housing and an inner housing with both ends open, and the open ends are joined to each other while the inner housing is housed inside the outer housing, and the outer housing and the said It is a vacuum double structure with a vacuum layer provided between it and the inner housing.
One end portion of the outer housing and the inner housing to which one open end side is joined by welding,
A vacuum double structure characterized in that the other open end side of the outer housing and the inner housing has the other joint end portion joined by brazing. The peripheral wall forming the other joint end of the outer housing and the peripheral wall forming the other joint end of the inner housing are arranged with a radial gap.
The vacuum double structure according to claim 1, wherein the peripheral walls of the other joint are joined to each other via a brazing material that has penetrated into the gap. A groove is provided on the distal end side of the peripheral wall forming the other joint end of the outer housing and the peripheral wall forming the other joint end of the inner housing.
The vacuum double structure according to claim 1 or 2, wherein at the other joint end portion, peripheral walls are joined to each other via a brazing material accumulated in the groove portion. The vacuum double structure according to claim 1 or 2, wherein a brazing receiving member is attached to the other open end via a brazing material. The peripheral wall forming the other joint end portion of the outer housing has a brazing receiving portion folded back toward the inner peripheral side with a portion facing the open end of the inner housing.
The vacuum double structure according to claim 1 or 2, wherein at the other joint end portion, peripheral walls are joined to each other via a brazing material accumulated in the brazing receiving portion. The peripheral wall forming the other joint end portion of the inner housing has a brazing receiving portion folded back toward the outer peripheral side with a portion facing the open end of the outer housing.
The vacuum double structure according to claim 1 or 2, wherein at the other joint end portion, peripheral walls are joined to each other via a brazing material accumulated in the brazing receiving portion. The peripheral wall forming the one joint end of the outer housing and the peripheral wall forming the one joint end of the inner housing are arranged so as to overlap in the radial direction.
The vacuum double structure according to claim 1 or 2, wherein the open ends of each other are joined by welding at one of the joint ends. A pair of left and right headphone bodies including a speaker unit that converts an electric signal into vibration to emit sound and a housing arranged on the back side of the speaker unit are provided.
The headphone according to any one of claims 1 to 7, wherein the housing is a vacuum double structure. It has a metal outer housing and an inner housing with both ends open, and the open ends are joined to each other while the inner housing is housed inside the outer housing, and the outer housing and the said It is a method of manufacturing a vacuum double structure in which a vacuum layer is provided between the inner housing and the inner housing.
After joining one open end side of the outer housing and the inner housing by welding, the other open end side of the outer housing and the inner housing is placed in a chamber depressurized to a high vacuum. A method for manufacturing a vacuum double structure, which comprises joining by brazing. A peripheral wall forming the other joint end of the outer housing and a peripheral wall forming the other joint end of the inner housing are arranged with a radial gap.
With the other opening end side facing downward or upward, the inside of the chamber is depressurized to a high vacuum, and then the brazing filler metal melted by heating is allowed to permeate into the gap, thereby forming the peripheral walls of each other. The method for manufacturing a vacuum double structure according to claim 9, wherein the vacuum double structure is joined via a material. A groove is provided on the distal end side of the peripheral wall forming the other joint end of the outer housing and the peripheral wall forming the other joint end of the inner housing.
With the other opening end side facing upward, the inside of the chamber is depressurized to a high vacuum, and then the brazing filler metal melted by heating is accumulated in the groove portion, whereby the peripheral walls of each other are passed through the brazing filler metal. The method for manufacturing a vacuum double structure according to claim 9 or 10, wherein the vacuum double structure is joined. A brazing receiving member is arranged so as to face the other end of the opening.
With the other opening end side facing downward or upward, the inside of the chamber is depressurized to a high vacuum, and then the brazing material melted by heating is stored in the brazing receiving member to form the peripheral walls of each other. The method for manufacturing a vacuum double structure according to claim 9 or 10, wherein the vacuum double structure is joined via a brazing material. The peripheral wall forming the other joint end of the outer housing is provided with a brazing receiving portion that is folded back toward the inner circumference with a portion facing the open end of the inner housing.
With the other open end side facing downward, the inside of the chamber is depressurized to a high vacuum, and then the brazing filler metal melted by heating is stored in the brazing receptacle to form the peripheral walls of the brazing filler metal. The method for manufacturing a vacuum double structure according to claim 9 or 10, wherein the vacuum double structure is joined via a sword. A wax receiving portion folded back toward the outer peripheral side with a portion facing the open end of the outer housing is provided on the peripheral wall forming the other joint end of the inner housing.
With the other open end side facing downward, the inside of the chamber is depressurized to a high vacuum, and then the brazing filler metal melted by heating is stored in the brazing receptacle to form the peripheral walls of the brazing filler metal. The method for manufacturing a vacuum double structure according to claim 9 or 10, wherein the vacuum double structure is joined via a sword. The peripheral wall forming the one joint end portion of the outer housing and the peripheral wall forming the one joint end portion of the inner housing are arranged so as to overlap in the radial direction.
The method for manufacturing a vacuum double structure according to claim 9 or 10, wherein in this state, the open ends are joined to each other by welding.

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