JP2951530B2 - Insulation material for bent pipe joints - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to water, oil, steam, gas,
Used as a heat insulator for piping of air and other fluids. The present invention is used for a bent portion of a pipe. The invention is particularly suitable for 90
It is suitable for use in pipe joints (elbows) that bend frequently.

[0002]

2. Description of the Related Art In a factory plant and the like, pipes are provided for transferring liquid and gas, and a heat insulating material is attached to the outer periphery of the pipes in order to reduce the influence of the temperature of the surrounding environment. For example, when the liquid flowing in the pipe is a low-temperature liquid, the temperature of the low-temperature liquid is affected by the surrounding environment and increases during transfer. In order to minimize the influence of the surrounding environment, a technique of mounting a heat insulating material formed of a plastic molded product cover and a heat insulating material around a pipe is widely known.

When the pipe is straight, the structure of the heat insulating material is simple, and the pipe has a cylindrical shape whose inner diameter is equal to the outer diameter of the pipe. However, when the pipe is bent, the heat insulating material must be manufactured according to the bent shape.
Conventionally, a plastic molded product 12 having a split along a central axis inside a bent portion on an outer periphery of a bent pipe joint (elbow) 1 having a structure shown in FIG.
A heat insulating material in which a heat insulating material 5 is filled inside is widely used. In addition to this elbow, the pipe joint is JIS-B2
Since various standards are established for the pipe diameter and shape in 301, it is possible to cope with various shapes by preparing a molded product corresponding to the shape. Then, a metal foil 13 is attached to the outer surface of the plastic molded product 12 so as to prevent dew condensation water or water vapor in the air from entering, and from an aesthetic viewpoint.

[0004]

In such a conventional structure, the outer shape of the heat insulating material of the plastic molded product 12 for the bent pipe joint 1 is similar to the elbow of the pipe. Therefore, attaching the flat metal foil 13 to the curved outer surface is a complicated operation. Conventionally, for this purpose, a metal foil tape having a back surface coated with an adhesive is used. The metal foil tape is previously machined using scissors so that the width of the metal foil tape is reduced in the portion corresponding to the small radius of curvature inside the bent portion, and while pulling this metal foil tape manually with a fingertip It was wound around the outer surface of the plastic molded product 12. The work of sticking the metal foils one by one along the outer shape of the plastic molded article 12 one by one by hand is more wrinkle unless the force is applied so that the metal foil tape is slightly rounded inward. It was necessary to do it with skillful pulling, which was a fairly skillful task. Therefore,
The man-hours required for this purpose were extremely large, and most of the product price was such that the man-hours required for attaching the metal foil tape were occupied.

[0005] Even if an attempt is made to perform this operation using an automatic machine tool, a metal foil tape is uniformly wound so that no gap is formed on the outer surface of the elbow shape and wrinkles are not formed as shown in FIG. Going was a very difficult task. In particular, it has been difficult for an automatic machine to attach a metal foil tape while pulling it along a rounded curved shape.

The present invention has been made in view of such a background, and an object of the present invention is to provide a structure in which a metal foil tape can be efficiently attached to an outer surface of a heat insulator made of a plastic molded product. . An object of the present invention is to reduce the number of work steps for attaching a metal foil tape.
SUMMARY OF THE INVENTION An object of the present invention is to perform an operation of attaching a metal foil tape using an automatic machine.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a heat insulating material capable of efficiently adhering a metal foil tape to an outer surface thereof, and relates to a plastic molded product mounted on an outer periphery of a bent pipe joint; In a heat insulating material for a bent pipe joint comprising a heat insulating material held in a space between the molded article and the bent pipe joint, and a metal foil adhered to an outer surface of the molded article, the plastic molded article Is characterized in that its surface is formed in a continuous shape of a plurality of n columnar segments.

It is desirable that the columnar shape is a cylindrical shape or a prismatic shape.

There are the following types of curved surfaces.

[0010]

[Table 1] The curved surface that can be developed in this is a single curved surface, which is further classified into a cylindrical surface, a conical surface, and a similar resilient surface, but the conical surface and the similar resilient surface are not practical as the outer surface of the molded product. Therefore, pillar surfaces are mainly used.

The columnar surface is a curved surface generated when one generating line moves parallel to itself along the conductive line, or a curved surface generated when one generating line moves parallel to the conductive plane.

[0012]

The cylindrical pipe is formed with a small thickness in accordance with the outer diameter of a bent pipe joint having the same diameter and bent at a predetermined angle, and is used to cover the bent pipe joint along the central axis inside the bent portion. The outer peripheral surface of the plastic molded product having a slit is formed in a continuous shape of a plurality of n columnar shaped segments. The columnar surface shape is a columnar surface shape or a prismatic surface shape. For example, as shown in FIGS. 17A to 17D, the cross-sectional shape is a circle, a square, an ellipse, or each corner of a prism. Is cut off in an arc shape.

On the other hand, the metal foil is formed so as to correspond to the outer peripheral surface of such a columnar segment. Therefore, when the individual columnar shape segments and the metal foil are developed in a tangential direction with respect to the central axis, the respective surfaces become flat. Therefore, if a metal foil is adhered according to the shape of the columnar shape segment, it becomes the same as the plane being in contact with the plane, and it can be easily adhered without generating wrinkles or bubbles.

Since the outer peripheral surface of the plastic molded product has a three-dimensional curved surface at the portion of the bent pipe joint to be mounted, when a metal foil is to be adhered without forming wrinkles on such a curved surface, One metal foil cannot be brought into close contact with the entire surface. Therefore, as described above, the plastic molded article is formed of several segments so as to be flat when the outer peripheral surface of the plastic molded article is unfolded, and a metal having a shape that can be adhered to the surface of each segment. If a foil is prepared, the curved surface is limited to one direction.

Thus, even if the metal foil is adhered by hand, no skill is required to prevent wrinkles and bubbles from being generated, and variations due to individual differences are eliminated. Can be manufactured. In addition, since it is possible to index each segment at a predetermined angle, it is a simple work to stick metal foil on the indexed surface, so it can be fully automated by a robot device, and mass production The cost can be significantly reduced.

[0016]

Next, an embodiment of the present invention will be described with reference to the drawings.

(First Embodiment) FIG. 1 is a perspective view showing a state before mounting on a bent pipe joint according to a first embodiment of the present invention, and FIG. 2 is a view in the direction of arrow A shown in FIG. 1 in the first embodiment of the present invention. FIG. 3A
(B) is a view showing a developed shape of the metal foil in the first embodiment of the present invention.

In the first embodiment of the present invention, a plastic molded product 2a mounted on the outer periphery of a bent pipe joint 1 having a bending angle of 90 degrees and a space between the plastic molded product 2a and the bent pipe joint 1 are provided. It comprises a heat insulating material 5 to be held and metal foils 3a ₁ and 3a ₂ attached to the outer peripheral surface of the plastic molded product 2a. The outer corner is cut linearly along the outer periphery so that the center line of the joint 1 is parallel to the tangent line tangent to the arc formed, and the inner corner is thinned to a certain thickness along the outer periphery. It is formed in the shape.

In the case of such an outer peripheral surface shape, two segments are formed in a continuous shape on one side, and the metal foil corresponding to each of the two segments when expanded is a flat surface as shown in FIGS. 3 (a) and 3 (b). Metal foils 3a ₁ and 3a
₂ types. In the first embodiment the metal foil 3a ₁ and 3a ₂ since plastic molding 2a is divided into two as shown in FIG. 1 are used two, respectively. The plastic molded product 2a is molded with the portion corresponding to the inner corner of the bent pipe joint 1 open as shown by the two-dot chain line in FIG. It is wound.

When the metal foils 3a ₁ and 3a ₂ are attached to the surface of the plastic molded product 2a, they are cut out slightly larger so as to overlap each other as shown by the broken lines in FIG. The background of the plastic molded product 2a is not exposed, so that water generated by dew condensation and water vapor in the air are prevented from entering the inside and the appearance can be maintained.

Further, by adopting such a shape,
Since the curved surface is no longer along the arcuate center line of the bending pipe joint 1 forms, becomes a metal foil 3a ₁ and 3a ₂ and work just paste simply to match the outer periphery surface of the plastic article 2a, it requires skill Work can be done in a single hour without any work. Further, since the sticking direction is limited to one direction, the sticking can be continuously performed by the automatic manufacturing apparatus, and the sticking operation with less uniform variation can be automatically performed.

[0022] When mounted to the bent pipe joint 1 is in the state seam inner corner portion of the plastic molding 2a of the metal foil 3a ₁ is attached is either affixed by overlapping double-sided tape, or the butted It is pasted on it with tape. Further, the joint between the thermal insulation material of the linear portion of the metal foil 3a ₁ is mounted in succession to the plastic molding 2a which is adhered, the tape as shown by the two-dot chain line in FIG. 2 thereon It is wound.

As a plastic molded product, a molded material such as polystyrene, polyethylene, or polyvinyl chloride is used. As a heat insulating material, cotton-like glass wool or rock wool is used. As a metal foil, a transparent material is used. A sheet reinforced with an aluminum film or a polyethylene film having a low humidity is used. For example, there is a sheet in which aluminum and kraft paper, aluminum and glass cloth, etc. are laminated.

(Second Embodiment) FIG. 4 is a perspective view showing a state before attachment to a bent pipe joint according to a second embodiment of the present invention, and FIG. 5 is a view in the direction of arrow B shown in FIG. FIG. 6A
(B) is a diagram showing a developed shape of the metal foil in the second embodiment of the present invention.

The second embodiment of the present invention is similar to the first embodiment, except that the plastic molded product 2 is mounted on the outer periphery of the bent pipe joint 1 having a bending angle of 90 degrees and is divided into two parts by a plane including the central axis.
comprising a b, or heat insulating material 5 which is held in the space between the plastic part 2b and the bent pipe joint 1, a metal foil 3b ₁ and 3b ₂ is stuck on the outer peripheral surface of the plastic molded article 2b.

In the case of the second embodiment, the plastic molded parts 2b are so formed that their outer diameters are equal to each other and their central axes are parallel to a tangent to an arc formed by the center line of the bent pipe joint 1. Are cut linearly along the outer circumference over two locations, and the inner corners are formed in a slightly lightened shape along the outer circumference as in the first embodiment.

In the case of such an outer peripheral surface shape, a three-segment continuous shape is formed on one side, and the corresponding metal foil is a flat metal foil as shown in FIGS. 6 (a) and 6 (b). It becomes two kinds of 3b ₁ and 3b _2, the metal foil 3b ₂ are used two. Therefore, since the plastic molded article 2b is divided into two, two metal foil 3b ₁ is for one of the bending pipe joint 1, the metal foil 3b ₂
Are used.

Since the plastic molded product 2b is molded with the portion corresponding to the inner corner of the bent pipe joint 1 opened as shown by the two-dot chain line in FIG. 4, the portion is indicated by an arrow at the time of mounting. In the case of the second embodiment wound inside as in the case of the second embodiment, the number of metal foils to be adhered is larger than in the case of the first embodiment, but since both become flat when unfolded, the same effect is obtained. Can be obtained.

(Third Embodiment) FIG. 7 is a perspective view showing a third embodiment of the present invention before it is mounted on a bent pipe joint, and FIG. 8 is a view of a third embodiment of the present invention viewed from the arrow C shown in FIG. FIG. 9
(A), (b), and (c) are views showing a developed shape of a metal foil in a third embodiment of the present invention.

In the third embodiment of the present invention, similarly to the first embodiment, a two-part plastic molded product 2c mounted on the outer periphery of the bent pipe joint 1 having a bending angle of 90 degrees, and the plastic molded product 2c is bent. A heat insulating material 5 held in a space between the pipe joint 1 and metal foils 3c ₁ , 3c ₂ and 3c ₃ adhered to an outer peripheral surface on one side of a plastic molded product 2c.
And

In the case of the third embodiment, the plastic molded products 2c are so arranged that their diameters are equal to each other and their central axes are parallel to a tangent to an arc formed by the center line of the bent pipe joint 1. The outside is cut off linearly along the outer periphery over two places slightly wider than the second embodiment, and the inner corners are formed into a shape that is fleshed along the outer periphery with a width slightly smaller than the second embodiment. You.

In the case of such an outer peripheral surface shape, as in the second embodiment, a continuous shape of four segments is formed on one side, and the corresponding metal foil is formed on one side by the metal foil shown in FIG. foil 3c ₁ is one, the metal foil 3c ₂ shown in (b) is two, metal foils 3c shown in FIG. (c)
₃ is used. Therefore, since the plastic molded product 2c is divided into two, eight metal foils are used for one bent pipe joint 1.

Since the plastic molded product 2c is formed in a shape in which a portion corresponding to the inner corner of the bent pipe joint 1 is opened as shown by a two-dot chain line in FIG. 7, the portion is indicated by an arrow at the time of mounting. Wrapped inside.

In the third embodiment, the number of metal foils used for one bent pipe joint 1 is eight as in the second embodiment.
Since each of them becomes flat when unfolded, it can be attached easily and in a short time without wrinkling as in the first embodiment.

(Fourth Embodiment) FIG. 10 is a perspective view showing a fourth embodiment of the present invention before being attached to a bent pipe joint, and FIG. 11 is a view of the fourth embodiment of the present invention as seen from an arrow D shown in FIG. Figure, Figure 1
FIGS. 2 (a), (b), and (c) are views showing a developed shape of a metal foil in a fourth embodiment of the present invention.

Similarly to the first embodiment, the fourth embodiment of the present invention comprises a two-part plastic molded product 2d mounted on the outer periphery of a bent pipe joint 1 having a bending angle of 90 degrees, and the plastic molded product 2d. A heat insulating material 5 held in a space between the bent pipe joint 1 and metal foils 3d ₁ , 3d ₂ , and 3 adhered to the outer peripheral surface on one side of the plastic molded product 2d
and a d _3.

In the case of the fourth embodiment, the plastic molded product 2d is placed on its outside so that its diameters are equal to each other and its central axis is parallel to the tangent to the arc formed by the center line of the bent pipe joint 1. Are cut off linearly along the outer circumference over two locations in substantially the same manner as in the third embodiment.

In the case of the fourth embodiment having such an outer peripheral surface shape, similarly to the third embodiment, a continuous shape of four segments is formed on one side, and the metal foil corresponding to each is shown in FIG. Metal foil 3d ₁ shown in (a)
But one, the metal foil 3d ₂ is two as shown in FIG. (B), the metal foil 3d ₃ shown in (c) is used one. Therefore, since the plastic molded product 2d is divided into two,
As in the third embodiment, eight metal foils are used for one bent pipe joint 1.

Similar to the first to third embodiments, the plastic molded product 2d has a shape in which a portion corresponding to the inner corner of the bent pipe joint 1 is open as shown by a two-dot chain line in FIG. Since it is molded, at the time of mounting, that part is wound inside as shown by the arrow.

In the fourth embodiment, the number of metal foils used for one bent pipe joint 1 is eight as in the third embodiment.
Since each of them becomes flat when unfolded, similar effects can be obtained.

(Fifth Embodiment) FIG. 13 is a perspective view showing a fifth embodiment of the present invention before being mounted on a bent pipe joint, and FIG. 14 is a partial cross section of the fifth embodiment of the present invention shown in FIG. E view, FIG. 15 is a view showing a developed shape of the metal foil in the fifth embodiment of the present invention, and FIG. 16 is a plastic molded product to which the metal foil is adhered in the fifth embodiment of the present invention attached to a bent pipe joint. It is a partial cross-section perspective view showing the state where it did.

The fifth embodiment of the present invention comprises, similarly to the above-described embodiments, a two-part plastic molded product 2e mounted on the outer periphery of a bent pipe joint 1 having a bending angle of 90 degrees, and the plastic molded product 2e. 2e and the heat insulating material 5 is held in the space between the bent pipe joint 1, and a metal foil 3e ₁ is adhered to the outer surface of the plastic article 2e, plastic molding 2e has a diameter from each other Equally, the central axis has a continuous shape of four segments on one side each set so as to be parallel to a tangent line tangent to an arc formed by the center of the bent pipe joint 1, and the metal foil 3e corresponds to each segment. N pieces (4 pieces in this embodiment) cut out
Are formed in a substantially rhombic shape.

On the other hand, the metal foil 3e adhered to the outer peripheral surface of the segment is also a complete plane cut out slightly larger corresponding to the surface. Therefore, when the metal foil 3e is adhered to the outer surface of the segment according to its shape, portions parallel to the axis on the circumference, etc., are covered without forming wrinkles because they correspond to each other in a straight line.

Since the metal foil 3e is cut out slightly larger at the joint between the segments, FIG.
Can be superimposed as shown by the broken line, and there is no portion where the background of the plastic molded product 2e is exposed, and there is no intrusion of dew condensation water or water vapor in the air and a bad appearance.

Since the plastic molded product 2d is molded in a shape corresponding to the inner corner of the bent pipe joint 1 as shown by a two-dot chain line in FIG. Sometimes the part is wrapped inward as indicated by the arrow.

As described above, in the present invention, since there is no curved surface along the arc formed by the center of the bent pipe joint 1, the sticking operation may be performed in accordance with the shape thereof, and any skill is required. Work can be performed in a short time. In addition, since the side surface shape of the bent portion is a continuous shape of four cylindrical bodies having a fan shape, indexing at a fixed angle becomes possible, and a simple metal foil 3e can be attached to the indexed surface. Because of the work content, automation can be performed so that continuous manufacturing is performed by an automatic manufacturing apparatus. As a result, it is possible to manufacture a more uniform product without variation without requiring any manpower.

In the fifth embodiment, the bent plastic molded product 2e has a continuous shape of four segments. However, the bent plastic molded product 2e can have a continuous shape of 4 to 7 depending on the type of the bent pipe joint 1. The bending angle of the bent pipe joint 1 is 90
The present invention is not limited to the degree but can be applied to any angle in JIS-B2301.

The rhombus-shaped metal foil 3e shown in FIG. 15 is divided into a fan shape by dividing the portion indicated by a two-dot chain line, and the divided portions are slightly overlapped and adhered to the outer peripheral surface of the corresponding segment. In this case, the number of sheets to be pasted increases, but there is an advantage that the work can be performed easily and the pasting can be performed quickly, and the finish can be finely finished.

Also in the case of the fifth embodiment, a tape 4 is provided at the joint portion with the heat insulating material to be attached to the linear portion as shown in FIG.
Is wrapped around to prevent the intrusion of dew condensation water and water vapor in the air.

[0050]

As described above, according to the present invention, the operation of attaching a metal foil to the outer surface of a heat insulating material for a bent pipe joint formed of a plastic molded product can be performed in a short time without generating wrinkles or bubbles. In addition, since automation becomes possible, there is an effect that the manufacturing cost can be reduced to a fraction of the conventional level.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state before attachment to a bent pipe joint according to a first embodiment of the present invention.

FIG. 2 is a view on arrow A shown in FIG. 1 in the first embodiment of the present invention.

FIGS. 3A and 3B are views showing a developed shape of a metal foil in the first embodiment of the present invention.

FIG. 4 is a perspective view showing a state before attachment to a bent pipe joint according to a second embodiment of the present invention.

FIG. 5 is a view on arrow B shown in FIG. 4 in the second embodiment of the present invention.

FIGS. 6A and 6B are views showing a developed shape of a metal foil in a second embodiment of the present invention.

FIG. 7 is a perspective view showing a state before attachment to a bent pipe joint according to a third embodiment of the present invention.

FIG. 8 is a view on arrow C shown in FIG. 7 in the third embodiment of the present invention.

FIGS. 9A, 9B, and 9C are views showing a developed shape of a metal foil in a third embodiment of the present invention.

FIG. 10 is a perspective view showing a state before mounting to a bent pipe joint according to a fourth embodiment of the present invention.

FIG. 11 is a view as seen from an arrow D shown in FIG. 10 in a fourth embodiment of the present invention.

FIGS. 12 (a), (b) and (c) are views showing a developed shape of a metal foil in a fourth embodiment of the present invention.

FIG. 13 is a perspective view showing a state before attachment to a bent pipe joint according to the fifth embodiment of the present invention.

FIG. 14 is a partial cross-sectional view taken along the arrow E shown in FIG.

FIG. 15 is a view showing a developed shape of a metal foil in a fifth embodiment of the present invention.

FIG. 16 is a partial cross-sectional perspective view showing a state in which a plastic molded product to which a metal foil is adhered according to a fifth embodiment of the present invention is mounted on a bent pipe joint.

17 (a) to (d) are perspective views showing a pillar state used for the shape of the outer peripheral surface according to the embodiment of the present invention.

FIG. 18 is a perspective view showing a mounted state of a moisturizer for a bent pipe joint in a conventional example.

[Explanation of symbols]

1 bending pipe fittings 2a, 2b, 2c, 2d, 2e, 12 plastic article _{3a 1, 3a 2, 3b 1} , 3b 2, 3c 1, 3c 2, 3
_{c 3, 3d 1, 3d 2} , 3d 3, 3e 1, 3e 2, 3e
₃ , 13 Metal foil 5 Insulation material

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16L 9/00-9/22 F16H 11/00-11/24 F16L 41/00-49/00 F16L 57/00-58 / 18 F16L 59/00-59/16

Claims (3)

(57) [Claims] A plastic mounted on the outer periphery of a bent pipe joint
The space between the molded article and this
Insulation material held in between and attached to the outer surface of the molded product
The plastic molded article includes a central axis of the bent pipe joint.
Heat insulation material for bent pipe joints
The plastic molded product has a plurality of n columnar surface segments.
The surface is formed of a continuous shape of the component, and the surface holds the heat insulating material to the plastic molded product
When they are attached to the bent pipe joint,
Equally its central axis is formed by the central axis of said bent joint
The outer corners are on the outer periphery so that they are parallel to the tangent to the arc
Along the perimeter along the perimeter
It is fleshed and formed into one linear shape, and each
When you expand the face of the
One surface that surrounds the rhombic surface of the lizard and develops almost a fan shape
Formed by a combination of, The rhombic surface and one surface developed from the substantially fan shape
Is divided into two parts by a plane including the central axis of the bent pipe joint.
Shaped metal foil stuck on each side Characterized by
Insulation material for flexible pipe joints. 2. A plastic molded product attached to the outer periphery of a bent pipe joint, a heat insulating material held in a space between the molded product and the bent pipe joint, and a plastic product adhered to an outer surface of the molded product. A plastic foil, wherein the plastic molded product has a shape that is divided into two by a plane including the central axis of the bent pipe joint, and the plastic molded product has a plurality of n column surfaces. Formed by a surface of a continuous shape of a shape segment, wherein the surface has the same diameter as the center axis of the bent pipe joint when the plastic molded article is mounted on the bent pipe joint while holding the heat insulating material. A surface of a continuous cylindrical surface in which n segments that are parallel to a tangent line tangent to an arc formed by the central axis are a continuous cylindrical surface, and when each segment surface is developed, a rhombic surface and a substantially fan-shaped surface are developed. Combination The rhombus-shaped surface and the fan-shaped developed surface are formed as
Planar shape metal divided into two by the plane including the central axis of the curved pipe joint
A heat insulating material for a bent pipe joint, characterized in that a foil is attached to each surface . 3. A plastic molded article mounted on the outer periphery of a bent pipe joint, a heat insulating material held in a space between the molded article and the bent pipe joint, and a plastic article adhered to an outer surface of the molded article. A plastic foil, wherein the plastic molded product has a shape that is divided into two by a plane including the central axis of the bent pipe joint, and the plastic molded product has a plurality of n column surfaces. Formed by a surface of a continuous shape of a shape segment, wherein the surface has the same diameter as the center axis of the bent pipe joint when the plastic molded article is mounted on the bent pipe joint while holding the heat insulating material. The n segments that are parallel to the tangent line tangent to the arc formed by the central axis are the surfaces of the continuous cylindrical surface, and when the surfaces of the respective segments are developed, they are formed by a surface composed of a combination of approximately rhombic surfaces. The rhombic surfaces each include the central axis of the bent pipe joint.
Metal foil with a flat shape divided into two parts on each side
A heat insulating material for bent pipe joints, which is worn .