JPH11193899A - Heat insulating pipe for fluid conveying pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfy both of an effective absorption of heat expansion and contraction and an adiabatic effect at the same time, and further, to efficiently manufacture a vacuum thermal insulating cylinder excellent in the adiabatic effect, and also to maintainadiabatic performance extending over a long period of time, thereby promoting the low-unit cost of production for a piping system. SOLUTION: Two vacuum thermal insulating cylinders 3a and 3b are fitted in a peripheral part of an inner pipe 2a conveying a fluid in a loose state. An outer circumferential surface of the inner pipe 2a and an inner circumferential surface of each of these vacuum thermal insulating cylinders 3a and 3b are separated from each other as capable of controlling a heat transfer, while a spacer 4 or a heat transfer controlling separative member is installed in space between the inner pipe 2a and the vacuum thermal insulating cylinders 3a and 3b so as to allow the relative movements of the inner pipe 2 and the vacuum thermal insulating cylinders 3a and 3b in the axial direction. In this connection, such a case that a casing is installed in the peripheral parts of the vacuum thermal insulating cylinders 3a and 3b with the spacer or the heat transfer controlling separative member may be interposed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used as a pipe for district cooling and heating, a pipe for high-temperature water / steam, a pipe for hot water supply equipment, a pipe for ultra-low temperature fluid, etc., for transporting various fluids from ultra-low temperature fluid to high temperature fluid. The present invention relates to a heat insulating pipe for a fluid transport pipe.

[0002]

2. Description of the Related Art Conventionally, vacuum insulated pipes have been used for transporting ultralow temperature fluids such as liquid helium and liquid hydrogen.
This vacuum insulated pipe is configured so that the space between the inner cylinder and the outer cylinder is evacuated, and has a characteristic that it is superior in heat insulation performance as compared with a heat insulation and cooling pipe provided with another heat insulating material. In such a vacuum insulation pipe, in order to absorb thermal expansion and contraction due to a temperature difference between the inner cylinder and the outer cylinder, for example, Japanese Patent Application Laid-Open No. 7-127
As described in Japanese Patent Application Laid-Open No. 789, JP-A-3-20190, etc., a configuration in which a corrugated portion (bellows portion) for absorbing thermal expansion and contraction is formed in an outer cylinder has been proposed. Further, in order to reduce the heat loss from the heat bridge at the partition of the vacuum space of the vacuum heat insulating tube and the connection portion of the heat insulating tube, for example, as described in JP-A-60-192198, There has been proposed a configuration in which a filler made of a polymer material is mounted in a gap between joints. In addition, in order to enhance the heat insulating effect of the connecting portion, for example, a real honest 7-407
As described in JP-A-91, the outer cylinder is set shorter than the inner cylinder, the ends thereof are sealed, the end faces of the inner cylinder are butt-welded, and the cylindrical shape is formed so as to straddle the outer cylinders on both sides. The fixed portion is fitted, and a void formed by the inner cylinder, the outer cylinder, and the fixed portion is filled with a porous heat-insulating material. There has been proposed a structure of a vacuum heat insulating piping joint in which an outer shell portion is provided and a space between the fixed portion and the outer shell portion is evacuated.

[0003]

However, for example, Japanese Patent Application Laid-Open Nos. Hei 3-20190 and Hei 7-7-1 mentioned above disclose the above.
In the vacuum heat insulating pipe described in Japanese Patent No. 27789, the ends of the inner cylinders are connected by butt welding at the time of piping, but the connection between the inner cylinders is formed by the absence of the vacuum heat insulating layer. It will be exposed and the heat insulation effect will be reduced.
In order to prevent this, it is necessary to insulate the exposed portion accompanying the connection between the inner cylinders at the piping work site. For example, it is conceivable to weld the cylinder at the outer peripheral portion of the inner cylinder, form a vacuum heat insulating layer by evacuating the sealed space inside the cylinder, If fixed to the like, it is not possible to cope with thermal expansion and contraction of the inner cylinder and the like, and there is a possibility of damage.

[0004] In order to solve the above-mentioned problem, as described in Japanese Utility Model Publication No. 7-40791, the outer cylinder and the cylinder may be fastened with a split clamp via an O-ring. Conceivable. However, in such a configuration, the heat insulation performance may be suddenly reduced due to the deterioration of the O-ring or the loosening of the clamp, and not only is the reliability inferior, but also the overall configuration of the joint is complicated, and the production is troublesome.
In addition, the cost is high, and furthermore, it is not possible to connect a vacuum insulated pipe having an inner diameter exceeding 60 mm on site. As described above, a fluid transport pipe capable of satisfying both the expansion and contraction due to heat and the heat insulating effect has not been obtained yet.

In any of the above-mentioned conventional vacuum insulation tubes, since a fluid is directly transported using the inside of the inner tube, a thick tube is used at least for the inner tube in order to maintain strength. There is a need. By the way, the entire vacuum insulation tube is heated (baked), and the closed space between the inner cylinder and the outer cylinder is evacuated to vacuum. And since the desorption rate of the gas molecules attached to the vacuum layer wall surface is limited by the temperature, when a thick tube is used for the inner cylinder as described above,
Heating is inferior in vacuuming, not only long time is required for vacuuming, but also there is a possibility that sufficient degassing treatment may not be performed, and accuracy and manufacturing efficiency are poor. Also, as described above, to transport fluid using the inside of the inner cylinder,
In particular, when the temperature of the transport fluid is high, the velocity of the released gas in the vacuum layer increases, causing an early drop in the degree of vacuum, so that the desired heat insulating effect cannot be maintained.

[0006] In particular, in the vacuum heat insulating pipes described in JP-A-3-20190 and JP-A-7-127789, since the corrugated portion is easily formed, the strength of the corrugated portion in transporting the fluid is low. The outer cylinder, which is not directly affected, is made thin, but if it is made thin in this way, it will be easily damaged by the collision of other objects, and if it breaks, the vacuum insulation pipe will immediately lose its insulation effect, The goal cannot be achieved. In addition, the corrugated portion on the wall surface of the vacuum layer becomes the resistance of vacuum evacuation and the portion to which the residual gas adheres, and the evacuation time becomes longer.

In addition, as described in Japanese Patent Application Laid-Open No. 60-192198, when a bayonet joint is used, there is a limitation on a pipe diameter that can be adopted due to its structure.
Generally, when the inner diameter exceeds 60 mm, it cannot be adopted, and it cannot be attached or detached unless the inner cylinder and the outer cylinder are moved in the tube axis direction by the length of the male and female insertions.

Further, conventionally, a vacuum heat insulating layer has been proposed in which a getter material is provided in the vacuum heat insulating layer to maintain a degree of vacuum in the vacuum heat insulating layer and prevent a decrease in heat insulating performance. Since the amount of gas molecules that can be adsorbed or absorbed on the surface and inside of the vacuum chamber is limited, the effect is maintained for a long time in a vacuum layer where sufficient degassing is not performed as described above. It is difficult to do.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems. The present invention can be applied to the transportation of a fluid from an extremely low temperature to a high temperature. By combining the tube and the vacuum insulation tube on its outer periphery independently and movably along the axial direction, both effective absorption of thermal expansion and contraction and insulation effect can be satisfied at the same time. A fluid capable of efficiently producing a vacuum insulated cylinder having an excellent effect, and also capable of maintaining the insulation performance for a long period of time, and consequently reducing the cost of the piping system. It is an object of the present invention to provide a heat insulating pipe for transportation piping.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a heat insulating pipe for a fluid transporting pipe according to the present invention comprises an inner pipe for transporting a fluid and a vacuum insulating pipe fitted in an outer peripheral portion of the inner pipe in a loose state. The tube and the outer peripheral surface of the inner tube and the inner peripheral surface of the vacuum insulation tube are separated so as to suppress heat transfer, and the inner tube and the vacuum insulation tube are allowed to move relative to each other in the axial direction. A heat transfer suppressing separating member provided between the inner tube and the vacuum heat insulating cylinder.

In order to solve the above-mentioned problems, another heat insulating pipe for a fluid transport pipe according to the present invention comprises: an inner pipe for transporting a fluid; a vacuum heat insulating cylinder fitted to an outer peripheral portion of the inner pipe in a loose state; While separating the outer peripheral surface of the inner tube and the inner peripheral surface of the vacuum insulated tube so as to suppress heat transfer, the inner tube and the inner tube are allowed to allow relative movement in the axial direction of the inner tube and the vacuum insulated tube. A heat transfer suppressing separating member provided between the vacuum heat insulating cylinder, a casing fitted in a loose state on the outer peripheral portion of the vacuum heat insulating cylinder, and an outer peripheral surface of the vacuum heat insulating cylinder and an inner peripheral surface of the casing. A heat transfer suppressing separation member is provided between the vacuum heat insulating tube and the casing so as to allow the heat transfer to be suppressed and to allow relative movement of the vacuum heat insulating tube and the casing in the axial direction. It is a thing.

[0012] In the above configuration, a plurality of inner tubes can be used to connect them in a sealed state, and a plurality of vacuum insulation tubes can be used to connect them in a sealed state. These can be connected in a sealed state using a tube, connected in a sealed state using a plurality of vacuum insulation tubes, and connected in a sealed state using a plurality of casings.

At the connection between the ends of the inner tube, a vacuum insulation tube formed in a divided shape by a sealing division surface passing through the axis is used, and this divided vacuum insulation tube is connected to both ends of the connection portion of the inner tube. It can be combined in a sealed state so as to straddle the outside. Alternatively, at the connection between the ends of the inner tube, a vacuum heat-insulating cylinder formed in a split type with a sealing split surface passing through the axis and a casing formed in a split type with a split surface passing through the axis are used. Can be combined in a sealed state so as to straddle both outer sides of the connection portion of the inner pipe, and the divided casing can be combined in a sealed state at an outer peripheral portion of the divided vacuum insulation cylinder.

In the case where a fluid direction changing portion is provided, the vacuum heat insulating cylinder used as a joint in the direction changing portion is formed into a split type by a sealing split surface passing through the axis, and the split type vacuum heat insulating tube is provided inside. A sealing division surface which can be combined in a sealed state at the outer periphery of the pipe, or a vacuum insulation cylinder and a casing used as a joint each pass through the axis,
Formed in a split type with a split surface passing through the axis, combining the vacuum heat insulating cylinder of the split type in a sealed state at the outer peripheral portion of the inner tube,
The split type casing can be combined in a sealed state at the outer peripheral portion of the split type vacuum insulation tube.

In the case where a fluid branch portion is provided, a vacuum heat insulating tube used as a joint at this branch portion is formed into a split type by a sealing split surface passing through an axis. The vacuum heat insulating cylinder and casing used as a joint can be combined in a sealed state at the outer peripheral portion, or are formed into a split type by a sealing division surface passing through the axis and a division surface passing through the axis, respectively, and the above-described vacuum insulation of the division type The tube can be combined in a sealed state at the outer peripheral portion of the inner tube, and the divided casing can be combined in a sealed state at the outer peripheral portion of the vacuum insulation tube of the divided type.

A plurality of units can be used by combining the inner tube, the vacuum insulation tube and the heat transfer suppressing separation member, and these units can be used. Alternatively, the inner tube, the vacuum insulation tube, the casing and the heat transfer suppression separation member can be combined. And a plurality of these units can be used. At this time, in the former, both ends of the inner tube are set to protrude from the ends of the vacuum insulation tube, and in the latter, both ends of the inner tube protrude from the ends of the vacuum insulation tube. The joint portion of the vacuum insulation tube can be set so as to protrude from the end of the casing.

As a joint at the end of the vacuum insulation tube, the ends of the vacuum insulation tube can be formed in an annular concavo-convex shape so as to be combined with each other. A threaded portion formed to be engaged can be provided.

A bellows portion capable of expanding and contracting in the axial direction can be provided in the vacuum heat insulating cylinder, a getter material is provided in the vacuum heat insulating layer of the vacuum heat insulating cylinder, and radiation is further radiated into the vacuum heat insulating layer of the vacuum heat insulating cylinder. Insulation can be provided.

As the heat transfer suppressing separating member, a linear or dot-like spacer capable of forming an air layer can be used, or a heat insulating material provided with a clearance can be used.

According to the present invention constructed as described above, the fluid is transported by utilizing the inside of the inner tube provided inside the vacuum insulating tube independently of the vacuum insulating tube. Are relatively movable with respect to the axial direction, and when having a casing, the vacuum insulated cylinder and the casing are independently movable relative to the axial direction. It can be freely moved and absorbed with respect to the inner pipe or the inner pipe and the casing. Also, by transporting fluid using the inside of the inner tube provided inside the vacuum insulation tube independently of the vacuum insulation tube,
Since the inner pipe is formed to have a thickness necessary for transporting the fluid to maintain strength, and the inner and outer cylinders of the vacuum heat insulating cylinder not used for transporting the fluid can be formed to be thin, the vacuum The heatability at the time of conversion is improved, the degassing process can be sufficiently performed, and the vacuum can be evacuated in a relatively short time. Further, since the inner tube for transporting the fluid and the vacuum insulation tube outside thereof are separated by the heat transfer suppressing separation member so as to suppress the heat transfer, it is possible to reduce the heat transfer to the vacuum insulation tube by the transport fluid. When a casing is provided outside the vacuum heat insulating cylinder, heat transfer to the vacuum heat insulating cylinder from the outside can be suppressed to a small extent by a heat transfer suppressing separating member therebetween, and the vacuum heat insulating layer is provided. The amount of gas released into the inside can be reduced.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. First, a first embodiment of the present invention will be described. FIG. 1A shows a first embodiment of the present invention.
And FIG. 3B is a partially cutaway front view showing one set of vacuum heat insulating cylinders used for the fluid transport piping heat insulating pipe according to the embodiment.

As shown in FIG. 1 (a), a heat insulating pipe 1 for a fluid transport pipe according to a first embodiment of the present invention comprises a plurality of straight tubular inner pipes 2a and a plurality of straight tubular vacuum heat insulating pipes. Tube 3a,
3b and a spacer 4 that is a heat transfer suppressing separation member.

Each straight tubular inner tube 2a is made of stainless steel, iron,
It is formed in a circular cross section by a desired material such as plastic. As shown in FIGS. 1 (a) and 1 (b), each of the straight tubular vacuum heat insulating cylinders 3a and 3b is made of stainless steel, carbon steel, aluminum, plastic, or the like, and has a straight tubular inner cylinder 11 having a circular cross section. An outer tube 12 is arranged concentrically, and an annular end plate 13 made of stainless steel, carbon steel, aluminum, plastic or the like at both ends of the inner tube 11 and the outer tube 12 and having a concentric step portion is welded or the like. Thus, an annular sealed space 14 is formed between the inner cylinder 11 and the outer cylinder 12 in a transverse cross section. In the closed space 14, a getter material 15 and a radiation heat insulating material 16 are provided. As an example, a getter material 15 is provided on the outer periphery of the inner cylinder 11, and a radiation heat insulating material 16 made of pearlite powder, fine powdery hollow glass spheres, or the like is enclosed. Alternatively, the radiation heat insulating material 16 is formed into a thin sheet and laminated.

Each of the vacuum heat insulating cylinders 3a and 3b has joint portions 17 at both ends. In one set of vacuum insulated cylinders 3a, both ends of the inner cylinder 11 are formed so as to slightly protrude from both ends of the outer cylinder 12. An end plate 13 having an annular stepped portion whose peripheral side protrudes and whose outer peripheral side is recessed is connected to form a joint portion 17. In the other set of vacuum insulated cylinders 3b,
Both ends of the outer cylinder 12 are formed so as to slightly protrude from both ends of the inner cylinder 11, and the inner cylinder side is recessed in both ends of the inner cylinder 11 and the outer cylinder 12 with respect to the axial direction, and the outer periphery is projected. An end plate 13 having a step portion is connected to form a joint portion 17. The one pair of the vacuum heat insulating cylinders 3a and the other set of the vacuum heat insulating cylinders 3b are configured such that the joint portions 17 formed of the annular steps at both ends thereof are fitted to each other. For example, each of the vacuum heat insulating cylinders 3a and 3b is configured such that the suction port is closed after a closed space 14 is evacuated by a vacuum pump using a suction port (not shown) formed in the outer cylinder 12. Forms a vacuum heat insulating layer. As an example, the spacer 4 is formed in a spiral line shape by a heat insulating material.

The inner tube 2a is formed to be relatively thick so as to have sufficient strength to be used for transporting a fluid. Since the vacuum heat insulating cylinders 3a and 3b are not used for transporting a fluid and need only be able to withstand vacuum evacuation, the inner cylinder 11, the outer cylinder 12, and the end plate 13 are formed to be thin. Therefore, since the heating property at the time of heating at the time of vacuuming is excellent and it is possible to sufficiently degas the constituent materials of the inner cylinder 11, the outer cylinder 11 and the end plate 13, the vacuum of the closed space 14, that is, the vacuum heat insulating layer The degree can be increased.

As shown in FIG. 1 (a), the ends of the inner pipes 2a are sequentially connected in a sealed state by butt welding or the like. The spiral linear spacer 4 is wound, and the vacuum heat insulating cylinders 3a and 3b are fitted to the outer peripheral portion of the inner tube 2a through the spacer 4 in a loose state. Then, the joint portions 17 at the ends of the vacuum heat insulating cylinders 3a and 3b are sequentially combined and connected via a sealing material (not shown). Inner tube 2a
The outer peripheral surface and the inner peripheral surfaces of the vacuum heat insulating cylinders 3a and 3b are separated by an air layer 18 formed by a spiral linear spacer 4 interposed therebetween so as to suppress heat transfer. Since it is independent of the heat insulating cylinders 3a and 3b, relative movement in the axial direction is allowed. Both ends of the air layer 18 are closed by appropriate means.

The heat insulating pipe 1 for a fluid transporting pipe constructed as described above transports a fluid by using the inside of the inner pipe 2a. In this way, the vacuum heat insulating cylinders 3a and 3b are made independent of the inner pipe 2a used for fluid transport, and the inner pipe 2a and the vacuum heat insulating cylinders 3a and 3b are relatively movable in the axial direction.
The spacers 4 are also brought into linear contact with both to reduce the frictional resistance. Therefore, the vacuum heat insulating cylinders 3a and 3b are connected to the inner pipe 2a during thermal expansion and contraction accompanying the fluid transport of the inner pipe 2a.
Can be freely and smoothly moved and absorbed. Further, the inner tube 2a for transporting the fluid and the vacuum heat insulating cylinders 3a and 3b outside the inner tube 2a are separated by the air layer 18 provided with the spacer 4 so as to suppress the heat transfer. The heat transfer is suppressed by reducing the heat transfer by contacting in a vacuum.
3b can be reduced. Further, the pressure of the vacuum heat insulating layer 14 in the vacuum heat insulating cylinders 3a and 3b is 10 Pa to 10 ^-4 Pa, but CO, CO ₂ , O ₂ , and H ₂ O released into the vacuum heat insulating layer 14 over time. Since gas molecules such as H ₂ and H ₂ can be adsorbed or absorbed by the getter material 15, the degree of vacuum, that is, the heat insulating effect can be maintained in combination with the radiation heat insulating material 16. Also, suppose that the vacuum insulation tube 3
Even if the outer cylinder 12 of a and 3b is damaged and loses the heat insulating effect, the air layer 18 provided between the inner pipe 2a and the inner cylinder 11 of the vacuum heat insulating cylinder 3a and 3b provides a certain heat insulating effect. Since the heat insulating effect can be maintained immediately without losing the heat insulating effect, the vacuum heat insulating cylinders 3a and 3b of the damaged portion are meanwhile maintained.
Repair, replacement, etc.

Next, a second embodiment of the present invention will be described. FIG. 2 is a partial longitudinal sectional view showing a heat insulating pipe for a fluid transporting pipe according to a second embodiment of the present invention, and FIG. 3 (a) is a split type used for a connection portion of an inner pipe in the heat insulating pipe for a fluid transporting pipe. FIG. 4 (b) is a cross-sectional view taken along the line AA of FIG. 4 (a), and FIGS. 4 and 5 are directions of fluid in the heat insulating pipe for the fluid transport pipe. FIG. 4 is an enlarged vertical sectional view similar to FIG. 3B, showing a split-type joint-type vacuum heat-insulating cylinder used for a conversion part and a fluid branch part.

As shown in FIG. 2, a heat insulating pipe 1 for a fluid transport pipe according to a second embodiment of the present invention comprises a plurality of straight, curved and branched inner pipes 2a, 2b, 2c. A plurality of tubular, curved tubular and branched vacuum insulation tubes 3a, 3
b, 3c, 3d, and 3e, and a spacer 4 that is a heat transfer suppressing separation member. Regarding the straight inner tube 2a, the straight vacuum insulation tubes 3a and 3b, and the spiral linear spacers 4 used for the heat transfer pipe 1 of the present embodiment, the heat transfer pipe insulation of the first embodiment is used. Since it is the same as that used for the tube 1, its description is omitted.

As shown in FIG. 2, the curved inner tube 2b is
It is used in the direction changing portion of the fluid, and has a circular cross-section made of the same material as the inner tube 2a, and in the present embodiment, is formed in a joint shape curved in an L-shape. The branched inner tube 2c is used at the branch portion of the fluid, and is formed of a material similar to that described above, has a circular cross section, and is formed in a T-shaped joint shape in the present embodiment.

In particular, as apparent from FIGS. 3 (a) and 3 (b), the vacuum heat insulating cylinder 3c used at the connecting portion of the inner pipes 2a, 2b and 2c is the same as that of the first embodiment shown in FIG. The shape of the vacuum insulation tube 3b used is short, and
A sealing plate 19 made of stainless steel or the like is fixed in a sealed state by welding or the like between the inner cylinder 11 and the outer cylinder 12 on each divided surface. Is configured. In the present embodiment, the sheet-shaped radiation heat insulating material 16 is used, but pearlite powder or the like may be used as described above. Also, the joint 17
May be formed in the same manner as the joint portion 17 of the vacuum heat insulating cylinder 3a used in the first embodiment shown in FIG. 1 so as to correspond to the shape of the joint portion to be connected.

In particular, as apparent from FIG. 4, the joint-shaped vacuum heat insulating cylinder 3d used at the outer periphery of the L-shaped curved inner tube 2b serving as the fluid direction changing portion is the same as the first embodiment shown in FIG. The vacuum heat insulating cylinder 3a used in the first embodiment is shortened, has a shape curved in an L shape, and is divided by a plane passing through the axis, and is divided between the inner cylinder 11 and the outer cylinder 12 on each divided surface. A sealing plate 19 made of stainless steel or the like is fixed in a sealed state by welding or the like, and is formed into a split type by a sealing division surface. The shape of the joint portion 17 of the present embodiment, which corresponds to the shape of the joint portion to be connected, corresponds to the joint portion 17 of the vacuum heat insulating cylinder 3b used in the first embodiment shown in FIG.
It may be formed in the same manner as described above.

In particular, as is clear from FIG. 5, the joint-shaped vacuum heat insulating cylinder 3e used at the outer peripheral portion of the T-shaped inner pipe 2c serving as the fluid branch portion is the first type shown in FIG. The vacuum insulation tube 3a used in the embodiment of the present invention is shortened, has a T-shaped branch shape, and is divided by a plane passing through the axis. A sealing plate 19 made of steel or the like is fixed in a sealed state by welding or the like, and is formed into a split type by a sealing division surface. The shape of the joint portion 17 of the present embodiment corresponds to the shape of the joint portion to be connected, so that the first shape shown in FIG.
It may be formed in the same manner as the joint part 17 of the vacuum heat insulating cylinder 3b used in the embodiment.

At the time of piping, as shown in FIG.
a, 2b, 2c are sequentially connected in a sealed state by butt welding or the like, and as the inner tubes 2a, 2b, 2c are connected, a spiral linear spacer 4 is formed on the outer peripheral surface thereof.
Is wound, and the vacuum heat insulating cylinders 3a and 3b are fitted to the outer peripheral portion of the inner tube 2a via the spacer 4 in a loose state. The joint portions 17 at the ends of the vacuum heat insulating cylinders 3a and 3b are sequentially connected to each other in a fitted state via a seal material (not shown).

At the outer periphery of the inner pipes 2b and 2c, split-type vacuum heat insulating pipes 3db and 3e for a joint are respectively combined via a spacer 4, and the sealing plates 19 are connected to each other via a sealing material. , Are fitted in a play state. In this embodiment, the vacuum heat insulating cylinders 3a, 3a
b is fitted with the spacer 4 interposed, and the vacuum heat insulating cylinder 3 d is fitted around the outer periphery of the inner tube 2 b with the spacer 4 interposed.
In a state in which the vacuum heat insulating cylinder 3e is fitted to the outer peripheral portion of the inner pipe 2c with the spacer 4 interposed therebetween, both ends of the inner tubes 2a, 2b and 2c can project slightly outward from the vacuum heat insulating cylinders 3a, 3b, 3d and 3e. Is set. Therefore, the inner tubes 2a, 2b, 2c
At the outer peripheral portion straddling both sides of the connecting portion, the split-type vacuum heat insulating cylinder 3c is combined via the spacer 4, the sealing plates 19 are connected via the sealing material, and are fitted in a loose state. . At the same time, the joint part 1 of the vacuum heat insulating cylinder 3c
7 is connected to the joint portion 17 of the vacuum heat insulating cylinders 3a, 3b, 3d, 3e in a fitted state via a sealing material. Outer peripheral surfaces of the inner tubes 2a to 2c and the vacuum insulation tubes 3a to 3e
Is separated from the inner peripheral surface by an air layer 18 formed by a spiral linear spacer 4 interposed therebetween so as to suppress heat transfer, and the inner tube 2a and the vacuum heat insulating cylinder 3a,
3b is allowed to move relatively in the axial direction. Both ends of the air layer 18 are closed by appropriate means.

The heat insulating pipe 1 for a fluid transport pipe constructed as described above transports a fluid by using the inside of the inner pipes 2a to 2c. In addition, it is possible to absorb thermal expansion and contraction caused by fluid transport of the inner pipes 2a to 2c, and to suppress heat transfer to the vacuum heat insulating cylinders 3a to 3e by the transport fluid,
The heat insulating effect can be maintained by the getter material 15 and a certain heat insulating effect can be maintained when the outer cylinder 12 of the vacuum heat insulating cylinders 3a to 3e is damaged. Same as in the case. In the present embodiment, furthermore, by using a split-type vacuum heat insulating cylinder 3c, the inner pipes 2a to 2c and the vacuum heat insulating cylinders 3a to 3e are used.
After assembling them into blocks each having an appropriate length, these blocks can be connected to each other, so that the work efficiency of piping on site can be further improved. In addition, by using the split-type vacuum heat insulating cylinders 3d and 3e for the joint, it is possible to easily adapt to heat insulation of the fluid direction change portion and the branch portion.

Next, a third embodiment of the present invention will be described. FIG. 6 is a partial longitudinal sectional view showing a heat insulating pipe for a fluid transport pipe according to a third embodiment of the present invention.

In this embodiment, as shown in FIG. 6, an intermediate portion between the inner cylinder 11 and the outer cylinder 12 in the vacuum insulated cylinders 3a (or 3b, 3c, 3d, 3e) arranged at one or a desired interval. Bellows part 20 at any place such as part
Are formed to be extendable and contractible. Other configurations are the same as those of the first or second embodiment.

By using the vacuum heat insulating cylinder 3a (or 3b, 3c, 3d, 3e) that can be expanded and contracted as in the present embodiment, the thermal expansion and contraction of the pipe can be more sufficiently absorbed. In addition, a vacuum heat insulating cylinder 3a that can be expanded and contracted when piping is used.
(Or 3b, 3c, 3d, 3e) with the bellows part 20
The other vacuum insulation cylinders 3a to 3e are slightly compressed.
When connected to the joint 1 due to the repulsive force of the bellows 20
Since a pressing force can always be applied to the joint 7, the adhesion can be improved in combination with a sealing material interposed in the joint portion 17 by coating or the like, and a good sealing state can be established. For other actions,
Or, it is the same as the second embodiment.

Next, a fourth embodiment of the present invention will be described. FIG. 7 is a partial longitudinal sectional view showing a heat insulating pipe for a fluid transport pipe according to a fourth embodiment of the present invention.

In this embodiment, as shown in FIG. 7, as the spacer 4 as a heat transfer suppressing separating member, a protrusion is formed on the inner peripheral surface of the inner cylinder 11 of the vacuum heat insulating cylinders 3a and 3b at a desired interval. (Or helical, point-like, etc.) integrally, and this spacer 4 is interposed between the outer peripheral surface of the inner tube 2a and
An air layer 18 is formed between the inner tube 2a and the vacuum insulation tubes 3a, 3b. Other configurations and operations are the same as those in the first to third embodiments.

Next, a fifth embodiment of the present invention will be described. FIG. 8 is a partial longitudinal sectional view showing a heat insulating pipe for a fluid transport pipe according to a fifth embodiment of the present invention.

In this embodiment, as shown in FIG. 8, the vacuum heat insulating cylinder 3a as the spacer 4 which is the heat transfer suppressing separating member, and the inner peripheral surface of the inner cylinder 11 of the split vacuum heat insulating cylinder 3c. Protrusions are integrally provided in a ring shape (or a spiral shape, a dot shape, or the like) at a desired interval, and the spacer 4 is interposed between the outer surface of the inner tube 2a and the inner tube 2a and the vacuum insulation tubes 3a, 3c.
An air layer 18 is formed between the two. Other configurations and operations are the same as those in the first to third embodiments.

In the case of having the direction changing portion and the branch portion as in the second embodiment shown in FIGS. 2 to 5, the spacer 4 as the heat transfer suppressing separation member is shown in FIGS. As in the fourth and fifth embodiments shown in FIG. 8, a projection is formed on the inner peripheral surface of each inner cylinder 11 of the joint-shaped L-shaped vacuum heat insulating cylinder 3d and the joint-shaped T-shaped vacuum heat insulating cylinder 3e. The spacers 4 are integrally provided at a desired interval in a ring shape (or a spiral shape, a dot shape) or the like, and the spacers 4 are interposed between the outer peripheral surfaces of the inner tubes 2b and 2c so that the inner tubes 2b and 2c and the vacuum insulation tubes 3d and 3e are Air layer 18 between
Can also be formed.

Next, a sixth embodiment of the present invention will be described. 9 to 11 show a unit of an inner tube, a vacuum heat insulating tube, and a heat transfer suppressing separating member used for a heat insulating tube for a fluid transport pipe according to a sixth embodiment of the present invention, and FIG. FIG. 10 (a) is a front view of a unit of the direction change unit, FIG. 10 (b) is a cross-sectional view taken along the line BB of FIG. 10 (a), and FIG. 11 (a) is a unit of the branch unit. FIG. 2B is a front view, and FIG. 2B is a cross-sectional view taken along the line CC in FIG.

In this embodiment, the heat insulating pipe 1 for fluid transport piping is unitized for each of a plurality of sections, and is connected to each unit in piping. FIG.
Is composed of a straight tubular inner tube 2a, a straight tubular vacuum insulation tube 3a (or 3b), and a spiral linear spacer 4. Both ends of the inner tube 2a are vacuum insulation tubes 3a.
(Or 3b) so as to be able to protrude slightly outward from both ends. The unit shown in FIGS. 10A and 10B is composed of an L-shaped inner tube 2b for direction change, a joint-shaped split vacuum insulation tube 3d and a spiral linear spacer 4 shown in FIG. It is configured so that both ends of the inner tube 2b can protrude slightly outward from both ends of the split-type vacuum heat insulating cylinder 3d. The units shown in FIGS. 11 (a) and 11 (b) are a T-shaped inner pipe 2c for branching, a joint-shaped split-type vacuum heat insulating cylinder 3e shown in FIG.
, And each end of the inner tube 2c is set so as to be able to slightly project outward from both ends of the split vacuum insulation tube 3e. In the illustrated example, the spacer 4 includes the inner tubes 2a, 2b,
2c, the vacuum heat insulating cylinders 3a, 3c, and 3d are configured as separate parts, but the inner cylinder 1 of the vacuum heat insulating cylinders 3a, 3c, and 3d
The protrusion may be provided integrally with the first member.

When piping, the inner tubes 2a, 2
The ends of b and 2c are sequentially connected in a sealed state by butt welding, and a spacer 4 is integrated with an outer peripheral portion straddling both sides of the connection portion of the inner tubes 2a, 2b and 2c, for example, as shown in FIG. And the sealing plates 19 (see FIG. 3) are connected via a sealing material, and the joint 17 of the vacuum insulating tube 3c is connected to the adjacent unit. The vacuum heat insulating cylinders 3a (or 3b), 3d, and 3e are connected to each other in a fitted state via a sealing material in a fitting state, and as a result, have the same configuration as that of the second embodiment shown in FIG. You. It is clear that the units shown in FIGS. 10 and 11 are not required when piping in a straight tube.

By dividing the heat insulating pipe 1 for fluid transport piping into a plurality of sections as in this embodiment, in addition to the advantages of the first to third embodiments, the unit can be manufactured at a factory or the like. Therefore, there is an advantage that the work at the piping work site can be performed easily and quickly.

Next, a seventh embodiment of the present invention will be described. FIG. 12 is a partially enlarged longitudinal sectional view showing a heat insulating pipe for a fluid transport pipe according to a seventh embodiment of the present invention.

In the present embodiment, as shown in FIG. 12, a heat insulating material or a heat insulating sheet is provided between the outer peripheral surface of the inner pipe 2a and the inner cylinder 11 of the vacuum heat insulating cylinders 3a and 3b as the heat transfer suppressing separation member 4. At least one of the peripheral surfaces (in the illustrated example, the inner tube 2a
Outer peripheral surface) is fitted or covered by winding,
A certain clearance (air layer) 21 is provided between the heat insulating material or the heat insulating sheet and the inner peripheral surface of the inner cylinder 11 of the vacuum heat insulating cylinders 3a and 3b or the outer peripheral surface of the inner pipe 2a. The vacuum heat insulating cylinders 3a and 3b are separated from each other so as to suppress heat transfer, and are configured to be relatively movable in the axial direction. As the heat insulating material and the heat insulating sheet, polystyrene foam, hard urethane foam, polyethylene foam, glass wool, rock wool, phenol foam, calcium silicate and the like are used. Further, in the illustrated example, it is applied to the location of the straight tubular inner pipe 2a and the vacuum heat insulating cylinders 3a and 3b.
It is apparent that the present invention can be applied to the location d, the location of the inner tube 2c of the branch portion and the location of the vacuum heat insulating cylinder 3e.

As in the first to sixth embodiments, the air layer 18 is provided between the inner pipes 2a to 2c and the vacuum heat insulating cylinders 3a to 3e by the spacer as the heat transfer suppressing separating member 4. In this case, conduction heat transfer by physical / mechanical contact can be effectively insulated, but the effect of preventing convection heat generated by convection of air and radiation heat transfer by electromagnetic waves is inferior. In contrast, the inner tubes 2a to 2a
By providing a heat insulating material or a heat insulating sheet, which is the heat transfer suppressing separation member 4, between c and the vacuum heat insulating cylinders 3 a to 3 e, it is possible to obtain an excellent insulating effect against the above heat transfer.

Next, an eighth embodiment of the present invention will be described. FIG. 13 is a partial longitudinal sectional view showing a heat insulating pipe for a fluid transport pipe according to an eighth embodiment of the present invention.

As shown in FIG. 13, the heat-insulating pipe 1 for a fluid transport pipe according to the eighth embodiment of the present invention is different from the first embodiment shown in FIG.
A plurality of straight tubular vacuum heat insulating cylinders 3a and 3b, and a spacer 4 serving as a heat transfer suppressing separating member, a plurality of straight tubular casings 5a, and a spacer 6 serving as a heat transfer suppressing separating member. Therefore, the configuration different from that of the first embodiment will be mainly described.

Each straight tubular casing 5a is made of stainless steel,
It is formed in a circular cross section by a desired material such as iron or plastic. The spacer 6 is formed in a spiral linear shape like the spacer 4 in the first embodiment. At the time of piping, as shown in FIG. 13, a spiral linear spacer 6 is wound around the outer peripheral surface of the outer cylinder 12 of the vacuum heat insulating cylinders 3a and 3b in the first embodiment, and the vacuum heat insulating cylinder 3
A casing 5a is fitted to the outer peripheral portions of a and 3b via a spacer 6 in a loose state. The ends of the casing 5a are sequentially connected in a sealed state by butt welding or the like. Outer peripheral surfaces of vacuum insulation tubes 3a and 3b and casing 5
a is separated from the inner peripheral surface a by an air layer 22 formed therebetween by the spacer 6 so as to suppress heat transfer,
Since the vacuum insulation cylinders 3a and 3b and the casing 5a are independent, relative movement in the axial direction is allowed so as to absorb thermal expansion and contraction. Both ends of the air layer 22 are closed by appropriate means.

According to this embodiment, in addition to the advantages of the first embodiment, the provision of the casing 5a makes it particularly suitable for use in a state in which external force is directly applied to the pipe as in the case of direct burial. In addition, heat transfer from the casing 5a to the vacuum heat insulating cylinders 3a and 3b can be reduced by the air layer 22.

Next, a ninth embodiment of the present invention will be described. FIG. 14 is a partial longitudinal sectional view showing a heat transfer pipe for a fluid transport pipe according to a ninth embodiment of the present invention, and FIG.
(B), (c) is a sectional view taken along the line DD in FIG. 14, a sectional view taken along the line EE, and a sectional view taken along the line FF in FIG.

As shown in FIGS. 14 and 15, a heat insulating pipe 1 for a fluid transport pipe according to a ninth embodiment of the present invention is a straight pipe, a curved pipe and a branch pipe in the second embodiment shown in FIG. Inner tubes 2a, 2b, 2c and a plurality of straight, curved, and branched vacuum insulation tubes 3a, 3b, 3
c, 3d, and 3e, and a spacer 4, which is a heat transfer suppressing separating member, a plurality of straight, curved, and branched casings 5a, 5b, and 5c, and a heat transfer suppressing separating member, a spacer 6 Therefore, a configuration different from that of the third embodiment will be mainly described.

The casing 5b used at the outer periphery of the vacuum heat insulating cylinder 3c is formed in a short straight tube of a desired material such as stainless steel, iron, plastic or the like, is divided by a plane passing through the axis, and is traversed by the division plane. It is designed to be combined in a circular shape. The casing 5c used at the outer peripheral portion of the joint-shaped vacuum heat insulating cylinder 3d that curves in an L shape,
It is formed in an L-shape from the same material as described above, is divided by a plane passing through the axis, and is combined into a circular cross section at the division plane. The casing 5d used at the outer periphery of the joint-shaped vacuum heat insulating cylinder 3e branched into a T-shape includes:
It is formed in a T shape by the same material as described above, is divided into two by a plane passing through the axis, and is combined into a circular cross-section at the division plane.

At the time of piping, a spiral linear spacer 6 is wound around the outer peripheral surface of the outer cylinder 12 of the vacuum heat insulating cylinders 3a to 3e in the second embodiment, and the vacuum heat insulating cylinders 3a, 3b
The casing 5a is fitted to the outer peripheral portion of the casing through a spacer 6 in a loose state. In addition, split casings 5c and 5d are respectively combined with the outer peripheral portions of the vacuum heat insulating cylinders 3d and 3e via the spacer 6, and the divided surfaces are abutted to each other and connected in a sealed state by welding or the like, and a loose state is formed. It is fitted in. A split casing 5b is combined with the outer peripheral portion of the vacuum heat insulating cylinder 3c via a spacer 6, the divided surfaces are abutted, connected in a sealed state by welding or the like, and fitted in a loose state. . The ends of the casings 5a, 5b, 5c, and 5d are sequentially connected in a sealed state by butt welding or the like. Vacuum insulation tube 3a
3e and the inner peripheral surfaces of the casings 5a to 5d are separated from each other by an air layer 22 formed by the spiral linear spacer 6 so as to suppress heat transfer,
Since the vacuum insulation tubes 3a to 3e and the casings 5a to 5d are independent, relative movement in the axial direction is possible so as to absorb thermal expansion and contraction. Both ends of the air layer 22 are closed by appropriate means.

According to the present embodiment, similar to the eighth embodiment, in addition to the advantages of the second embodiment, the provision of the casings 5a to 5d makes it possible, in particular, to connect the pipes as in the case of direct embedding. It is suitable for use in a state where an external force is directly applied, and the air layer 22 can suppress the heat transfer from the casings 5a to 5d to the vacuum heat insulating cylinders 3a to 3e.

Next, a tenth embodiment of the present invention will be described. FIG. 16 is a partial longitudinal sectional view showing a heat insulating pipe for a fluid transport pipe according to a tenth embodiment of the present invention.

In the present embodiment, as shown in FIG. 16, an intermediate portion between the inner cylinder 11 and the outer cylinder 12 in the vacuum insulated cylinders 3a (or 3b, 3c, 3d, 3e) arranged at one or at desired intervals. Bellows part 20 at any place such as part
Are formed to be extendable and contractible. Other configurations are the same as those of the eighth or ninth embodiment.

By using the expandable and contractible vacuum insulation tube 3a (or 3b, 3c, 3d, 3e) as in this embodiment, the thermal expansion and contraction of the pipe can be absorbed even more sufficiently. In addition, a vacuum heat insulating cylinder 3a that can be expanded and contracted when piping is used.
(Or 3b, 3c, 3d, 3e) with the bellows part 20
The other vacuum insulation cylinders 3a to 3e are slightly compressed.
When connected to the joint 1 due to the repulsive force of the bellows 20
Since a pressing force can always be applied to the joint 7, the adhesion can be improved in combination with a sealing material interposed in the joint portion 17 by coating or the like, and a good sealing state can be established. For other functions, see the eighth section above.
Or, it is similar to the ninth embodiment.

Next, an eleventh embodiment of the present invention will be described. FIG. 17 is a partial longitudinal sectional view showing a heat insulating pipe for a fluid transport pipe according to an eleventh embodiment of the present invention.

In the present embodiment, as shown in FIG. 17, spacers 4 and 6 which are heat transfer suppressing separation members are used as inner peripheral surfaces of inner cylinder 11 and outer cylinder 12 of vacuum heat insulating cylinders 3a and 3b. Are integrally provided in a ring shape (or a spiral shape, a dot shape, etc.) at a desired interval, and these spacers 4 and 6 are interposed between the outer peripheral surface of the inner pipe 2a and the inner peripheral surface of the casing 5a, Between the inner tube 2a and the inner tube 11 of the vacuum heat insulating tubes 3a and 3b, the outer tube 12 of the vacuum heat insulating tubes 3a and 3b and the casing 5a
The air layers 18 and 22 are formed between them.
Other configurations and operations are described in the eighth to first aspects.
0 is the same as the embodiment.

Next, a twelfth embodiment of the present invention will be described. FIG. 18 is a partial longitudinal sectional view showing a heat insulating pipe for a fluid transport pipe according to a twelfth embodiment of the present invention.

In the present embodiment, as shown in FIG. 18, the inner periphery of the inner cylinder 11 of the vacuum heat insulating cylinder 3a and the split vacuum heat insulating cylinder 3c as the spacers 4 and 6, which are the heat transfer suppressing separation members. Protrusions are integrally provided at desired intervals in a ring shape (or a spiral shape, a dot shape, or the like) on the surface and the outer peripheral surface of the outer cylinder 12.
a, 5b, between the inner tube 2a and the inner tube 11 of the vacuum heat insulating tubes 3a, 3c, and between the outer tube 12 of the vacuum heat insulating tubes 3a, 3c and the casings 5a, 5b, respectively. Air layers 18 and 22 are formed. Other configurations and operations are the same as those of the eighth to tenth embodiments.

In the case of having a direction change portion and a branch portion as in the ninth embodiment shown in FIG. 14, the spacers 4 and 6 which are the heat transfer suppressing separation members are shown in FIGS. In the same manner as in the eleventh and twelfth embodiments shown in FIGS. 11A and 11B, the inner peripheral surface of each inner cylinder 11 and each outer cylinder 12 of the joint-shaped L-shaped vacuum heat-insulated cylinder 3d and the joint-shaped T-shaped vacuum heat-insulated cylinder 3e. Are provided integrally with each other in a ring shape (or a spiral shape, a dot shape) or the like at desired intervals on the outer peripheral surface of the inner tubes 2b and 2c.
Of the inner tubes 2b, 2c and the inner cylinders 11 of the vacuum heat insulating cylinders 3d, 3e.
Between the outer cylinder 12 of the vacuum heat insulating cylinders 3d and 3e and the casings 5c and 5d, respectively.

Next, a thirteenth embodiment of the present invention will be described. 19 to 21 show a unit of an inner tube, a vacuum heat insulating tube, a heat transfer suppressing separation member and a casing used for a heat insulating tube for fluid transport piping according to a thirteenth embodiment of the present invention, and FIG. FIG. 20 is a longitudinal sectional view of the unit.
(A) is a front view of the unit of the direction changing unit, (b) is a cross-sectional view taken along the line GG of FIG. (A), and (a) of FIG. 21 is a front view of the unit of the branch unit. It is H-H arrow sectional drawing of a).

In the present embodiment, the heat insulating pipe 1 for fluid transport piping is unitized for each of a plurality of sections, and is connected to each unit when piping. FIG.
The unit shown in FIG. 9 includes a straight tubular inner tube 2a, a straight tubular vacuum heat insulating tube 3a (or 3b), and a spiral linear spacer 4, and both ends of the inner tube 2a are connected to the vacuum heat insulating tube 3a.
a (or 3b) project slightly outward from both ends of the casing 5a, and from both ends of the casing 5a, the vacuum insulated cylinder 3a (or 3b).
The joint 17 of b) is set so that it can protrude.
The units shown in FIGS. 20 (a) and 20 (b) are composed of an L-shaped inner tube 2b for changing direction, a joint-shaped split-type vacuum heat insulating cylinder 3d shown in FIG. The inner tube 2b is composed of a V-shaped casing 5b and a spiral linear spacer 6. Both ends of the inner tube 2b protrude slightly outward from both ends of the split type vacuum insulation tube 3d. It is set so that the 3d joint portion 17 can protrude. The units shown in FIGS. 21A and 21B are:
A T-shaped inner tube 2c for branching, a joint-shaped split vacuum insulation tube 3e shown in FIG. 5, a spiral linear spacer 4 and T
The inner tube 2c is formed of a V-shaped casing 5c and a spiral linear spacer 6. Each end of the inner tube 2c protrudes slightly outward from both ends of the split vacuum insulation tube 3e, and a vacuum is applied from each end of the casing 5c. The joint portion 17 of the heat insulating cylinder 3e is set so as to protrude. In the illustrated example, the spacers 4 and 6 are configured as separate components from the inner tubes 2a, 2b and 2c, the vacuum heat insulating cylinders 3a, 3c and 3d, and the casings 5a, 5b and 5c. The protrusion may be provided integrally with the 3d inner cylinder 11 and outer cylinder 12.

For piping, the inner pipes 2a, 2a
As shown in FIG. 18, for example, as shown in FIG. 18, the ends of b and 2c are sequentially connected to each other in a sealed state by butt welding, and at the outer peripheral portion straddling both sides of the connection portion between the inner tubes 2a, 2b and 2c.
Split-type vacuum heat insulating cylinder 3c integrally having spacer 4
And the sealing plates 19 (see FIG. 3) are connected to each other via a sealing material. At the same time, the joint portion 17 of the vacuum insulation tube 3c is connected to the vacuum insulation tube 3a (or 3b), 3d, 3e of the adjacent unit. 14 is connected to the joint portion 17 via a seal member in a fitted state. As a result, the configuration is the same as that of the ninth embodiment shown in FIG. It is clear that the units shown in FIGS. 20 and 21 are not required when piping in a straight tube.

By dividing the heat insulating pipe 1 for fluid transport pipes into a plurality of sections as in this embodiment, in addition to the advantages of the eighth to tenth embodiments, the unit can be manufactured at a factory or the like. Therefore, there is an advantage that the work at the piping work site can be performed easily and quickly.

Next, a fourteenth embodiment of the present invention will be described. FIG. 22 is a partially enlarged vertical sectional view showing a heat insulating pipe for fluid transport piping according to a fourteenth embodiment of the present invention.

In the present embodiment, as shown in FIG. 22, a heat insulating material or a heat insulating sheet is provided between the outer peripheral surface of the inner pipe 2a and the vacuum heat insulating cylinder 3a as the heat transfer suppressing separation members 4 and 6.
At least one of the inner peripheral surface of the inner cylinder 11 (the outer peripheral surface of the inner tube 2a in the illustrated example) and the outer peripheral surface of the outer cylinder 12 of the vacuum heat insulating cylinders 3a and 3b and at least one of the inner peripheral surfaces of the casing 5a (the illustrated example) In this case, the outer peripheral surface of the outer cylinder 12 of the vacuum heat insulating cylinders 3a and 3b) is fitted or covered by winding, and the heat insulating material or the heat insulating sheet and the inner peripheral surface of the inner cylinder 11 of the vacuum heat insulating cylinders 3a and 3b or the inner pipe are used. Some clearances (air layers) 21 and 23 are provided between the outer peripheral surface of 2a and the heat insulating material, or between the heat insulating sheet and the inner peripheral surface of the casing 5a or the outer cylinder 12 of the vacuum heat insulating cylinders 3a and 3b. The inner tube 2a and the vacuum heat insulating cylinders 3a and 3b, and the vacuum heat insulating cylinders 3a and 3b and the casing 5a are separated from each other so as to suppress heat transfer, and are configured to be relatively movable in the axial direction. As the heat insulating material and the heat insulating sheet, the same materials as those in the seventh embodiment are used. In the illustrated example,
Although it is applied to the position of the straight inner tube 2a, the vacuum heat insulating tubes 3a and 3b, and the casing 5a, the inner tube 2b of the direction changing portion, the position of the vacuum heat insulating tube 3d and the casing 5b, and the inner tube 2c of the branch portion are formed. It is clear that the present invention can be applied to both the vacuum insulation tube 3e and the casing 5c.

In the present embodiment, as in the seventh embodiment, an excellent insulating effect against conduction heat and radiation heat can be obtained, and the casings 5a to 5
An insulating effect can also be obtained with respect to each heat transfer from c to the vacuum insulation cylinders 3a to 3e.

Next, a fifteenth embodiment of the present invention will be described. FIG. 23 is a partial longitudinal sectional view showing a heat insulating pipe for a fluid transport pipe according to a fifteenth embodiment of the present invention.

In this embodiment, FIGS.
The first to seventh embodiments without the casing shown in FIG. 13, the eighth with the casing shown in FIG. 13 to FIG.
The joint portions 17 at both ends of the vacuum heat insulating cylinders 3a to 3e in the fourteenth to fourteenth embodiments are formed into tapered irregularities, and are configured to be connected to each other via a sealing material. Other configurations and operations are the same as in the above embodiments.

Next, a sixteenth embodiment of the present invention will be described. FIG. 24 is a partial longitudinal sectional view showing a heat insulating pipe for fluid transport piping according to a sixteenth embodiment of the present invention.

In this embodiment, FIGS.
The first to seventh embodiments without the casing shown in FIG. 13, the eighth with the casing shown in FIG. 13 to FIG.
Threaded portions 24 are formed in the joint portions 17 at both ends of each of the vacuum heat insulating cylinders 3a to 3e in each of the fourteenth to fourteenth embodiments, and are connected by being screwed to each other via a sealing material. is there. Other configurations and operations are the same as in the above embodiments.

In the heat-insulating pipe 1 for a fluid transport pipe without the casing 5 as in the first to seventh embodiments, a pipe for district cooling / heating, a pipe for high-temperature water and steam, a pipe for hot water supply equipment, It is suitable for transporting from cryogenic fluid to high-temperature fluid in places where external pressure is not applied, such as indoors, common ditches, etc., such as cryogenic fluid piping. On the other hand, the eighth to the first
As in the fourth embodiment, in the heat insulating pipe 1 for a fluid transport pipe provided with the casing 5, a pipe for district cooling and heating, a pipe for high-temperature water and steam, a pipe for a hot water supply facility, a pipe for a cryogenic fluid, etc. It is suitable for transporting from a cryogenic fluid to a hot fluid in a place where external pressure is applied such as buried underground.

In each of the above embodiments, only one system of the inner tube 2 is used in the direction along the axis. However, a plurality of systems can be used in the direction along the axis.
Further, when the distance required for the piping is short, the inner pipe, the vacuum heat insulating cylinder, and the casing are formed to be long, and the heat insulating pipe for the fluid transport pipe can be constituted by only one each. Further, a unit can be formed in a state in which a plurality of vacuum heat insulating cylinders 3 are connected to the inner pipe 2 in a single or plural connected state, or to the inner pipe 2 and the casing 5 respectively.
In this unitization, in the above-described embodiment, both ends of the inner tube 2 are set so as to protrude from the ends of the vacuum heat insulating tube 3, or both ends of the inner tube 2 are protruded from the ends of the vacuum heat insulating tube 3. The joint 17 of the vacuum heat insulating cylinder 3 is set so as to protrude from both ends of the casing 5, and the joint type vacuum heat insulating cylinder 3 c is connected to the inner pipe 2. Is not used, the length can be set arbitrarily, such as making all lengths equal. A polyurethane liquid or the like is filled and foamed between the outer peripheral surface of the inner tube 2 and the inner peripheral surface of the vacuum heat insulating cylinder 3 and further between the outer peripheral surface of the vacuum heat insulating cylinder 3 and the inner peripheral surface of the casing 5. By forming the foamed polyurethane, the heat transfer is suppressed, and the relative movement in the axial direction of the inner cylinder 2 and the vacuum heat insulating cylinder 3, and furthermore, the vacuum heat insulating cylinder 3 and the casing 5 is caused by the application of the external force accompanying the thermal expansion and contraction. I can forgive. In this case, there is no space layer that can be said to be an air layer, and it becomes unnecessary. In addition, each vacuum insulation tube 3
Is plated with Cu, Ni, Ag, etc. on the inner peripheral surface of the inner cylinder 11 and the outer peripheral surface of the outer cylinder 12 to prevent radiant heat transfer,
When the inner cylinder 11 and the outer cylinder 12 are made of metal, it is preferable that the inner and outer peripheral surfaces thereof are polished and mirror-finished. The vacuum insulation tube 3 can maintain the degree of vacuum for a long period of time by providing the getter material 15 in the closed space 14, but the getter material 15 and the radiant heat transfer material 16 can be maintained for a long time. When the degree of vacuum of the vacuum heat insulating layer that is the closed space 14 is reduced, the vacuum may be increased to increase the degree of vacuum. Also,
By forming the shape and structure of the joint portion 17 of the vacuum heat insulating cylinder 3 as in the above embodiments, the connection work can be easily performed, and the heat transfer cross-sectional area is small and the heat transfer distance is long. Although the heat conduction in the connecting portion can be reduced, the present invention is not limited to this, and an arbitrary shape and structure can be selected.
For example, when connecting the vacuum heat insulating cylinders 3 by a joint part,
A sealing material is interposed in a flange portion integrally provided on the outer periphery of the vacuum heat insulating cylinder 3 and the flange portion is tightened by a clamp or the like, so that the vacuum heat insulating cylinders 3 are further securely sealed. Can be connected. Further, the vacuum heat insulating cylinders 3c, 3d, 3e, the casing 5
b, 5c and 5d are not limited to the split type,
It can be divided into any number, such as three. Further, the configurations of the respective units of the above embodiments can be selectively combined and used. In addition, the present invention can be variously changed in design without departing from the basic technical idea.

[0082]

As described above, according to the present invention, the fluid is transported by using the inside of the inner tube provided inside the vacuum insulating tube independently of the vacuum insulating tube. Are relatively movable with respect to the axial direction, and when having a casing, the vacuum insulated cylinder and the casing are independently movable relative to the axial direction. It can be freely moved and absorbed with respect to the inner pipe or the inner pipe and the casing. Therefore, both the effective absorption of thermal expansion and contraction and the heat insulating effect can be satisfied simultaneously. Also, by transporting the fluid using the inside of the inner tube provided inside the vacuum insulation tube independently of the vacuum insulation tube, the inner tube is formed to have a thickness necessary for transporting the fluid so as to maintain the strength. In addition, since the inner and outer cylinders of the vacuum insulated cylinder that are not used for transporting fluid can be formed to be thin, the heating property at the time of vacuuming becomes good, and the degassing process can be sufficiently performed, and Vacuum can be achieved in a relatively short time. Therefore, it is possible to efficiently manufacture a vacuum heat insulating cylinder having an excellent heat insulating effect. Further, since the inner tube for transporting the fluid and the vacuum insulation tube outside thereof are separated by the heat transfer suppressing separation member so as to suppress the heat transfer, it is possible to reduce the heat transfer to the vacuum insulation tube by the transport fluid. When a casing is provided outside the vacuum heat insulating cylinder, heat transfer to the vacuum heat insulating cylinder from the outside can be suppressed to a small extent by a heat transfer suppressing separating member therebetween, and the vacuum heat insulating layer is provided. The amount of gas released into the inside can be reduced. Therefore, the heat insulation performance can be maintained for a long time, and as a result, the cost of the piping system can be reduced.

[Brief description of the drawings]

FIG. 1 (a) is a partial longitudinal sectional view showing a heat insulating pipe for a fluid transportation pipe according to a first embodiment of the present invention, and FIG. 1 (b) is one set of vacuum insulation used for the heat insulating pipe for the fluid transportation pipe. It is a partially broken enlarged front view which shows a cylinder.

FIG. 2 is a partial longitudinal sectional view showing a heat insulating pipe for a fluid transport pipe according to a second embodiment of the present invention.

3 (a) is a partially broken enlarged front view showing a divided vacuum heat insulating cylinder used for a connection portion of an inner pipe in the heat insulating pipe for fluid transport piping, and FIG. 3 (b) is a view of FIG. It is AA arrow sectional drawing.

FIG. 4 shows a joint-type vacuum heat insulating cylinder of a split type used for a fluid direction changing portion in the heat insulating pipe for a fluid transport pipe, and FIG.
It is an expanded longitudinal sectional view similar to (b).

FIG. 5 shows a joint-type vacuum heat insulating cylinder of a split type used for a branch portion of a fluid in the heat insulating pipe for a fluid transport pipe, and FIG.
It is an expanded longitudinal sectional view similar to (b).

FIG. 6 is a partial longitudinal sectional view showing a heat insulating pipe for a fluid transport pipe according to a third embodiment of the present invention.

FIG. 7 is a partial longitudinal sectional view showing a heat insulating pipe for a fluid transport pipe according to a fourth embodiment of the present invention.

FIG. 8 is a partial longitudinal sectional view showing a heat insulating pipe for a fluid transport pipe according to a fifth embodiment of the present invention.

FIG. 9 is a longitudinal sectional view of a unit of a straight tubular portion, showing a unit of an inner tube, a vacuum heat insulating tube, and a heat transfer suppressing separation member used for a heat transfer tube for a fluid transport pipe according to a sixth embodiment of the present invention. .

FIG. 10 (a) shows a unit of an inner pipe, a vacuum heat insulating cylinder, and a heat transfer suppressing separation member used for a heat transfer pipe for a fluid transport pipe according to a sixth embodiment of the present invention, and is a front view of a unit of a direction changing unit. (B) is a cross-sectional view taken along line BB of (a).

FIG. 11 (a) shows a unit of an inner pipe, a vacuum heat insulating pipe, and a heat transfer suppressing separation member used for a heat transport pipe for a fluid transport pipe according to a sixth embodiment of the present invention. (B) is a sectional view taken along the line CC of (a).

FIG. 12 is a partially enlarged longitudinal sectional view showing a heat insulating pipe for a fluid transport pipe according to a seventh embodiment of the present invention.

FIG. 13 is a partial longitudinal sectional view showing a heat insulating pipe for a fluid transport pipe according to an eighth embodiment of the present invention.

FIG. 14 is a partial longitudinal sectional view showing a heat insulating pipe for a fluid transport pipe according to a ninth embodiment of the present invention.

15 (a), (b), and (c) are a cross-sectional view taken along a line DD, a cross-sectional view taken along a line EE, and a cross-sectional view taken along a line FF of FIG. 14, respectively.

FIG. 16 is a partial longitudinal sectional view showing a heat insulating pipe for fluid transport piping according to a tenth embodiment of the present invention.

FIG. 17 is a partial longitudinal sectional view showing a heat insulating pipe for a fluid transport pipe according to an eleventh embodiment of the present invention.

FIG. 18 is a partial longitudinal sectional view showing a heat insulating pipe for a fluid transport pipe according to a twelfth embodiment of the present invention.

FIG. 19 is a vertical sectional view of a unit of a straight tubular portion, showing a unit of an inner tube, a vacuum heat insulating tube, a heat transfer suppressing separation member and a casing used for a heat insulating tube for fluid transport piping according to a thirteenth embodiment of the present invention. It is.

FIG. 20 (a) shows a unit of an inner tube, a vacuum heat insulating tube, a heat transfer suppressing separation member and a casing used for a heat insulating tube for fluid transport piping according to a thirteenth embodiment of the present invention, FIG. 2B is a front view, and FIG. 2B is a sectional view taken along line GG of FIG.

FIG. 21 (a) shows a unit of an inner tube, a vacuum heat insulating tube, a heat transfer suppressing separation member and a casing used for a heat insulating tube for fluid transport piping according to a thirteenth embodiment of the present invention, FIG. 2B is a sectional view taken along the line HH in FIG.

FIG. 22 is a partially enlarged longitudinal sectional view showing a heat insulating pipe for a fluid transport pipe according to a fourteenth embodiment of the present invention.

FIG. 23 is a partially enlarged longitudinal sectional view showing a heat insulating pipe for a fluid transport pipe according to a fifteenth embodiment of the present invention.

FIG. 24 is a partially enlarged longitudinal sectional view showing a heat insulating pipe for a fluid transport pipe according to a sixteenth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat insulation pipe for fluid transport piping 2a-2c Inner pipe 3a-3c Vacuum insulation tube 4 Separation member for heat transfer suppression 5a-5c Casing 6 Separation member for heat transfer suppression 11 Inner tube 12 Outer tube 15 Getter material 16 Radiation insulation material 17 Joint part 18 Air layer 20 Bellows part 22 Air layer

Continuation of the front page (72) Inventor Toru Nakazawa 2-5-113, Sanno, Ota-ku, Tokyo Inside Benkan Corporation (72) Inventor Tomohiro Matsuo 2-5-13-, Sanno, Ota-ku, Tokyo Inside Bencan Corporation (72) Inventor Takuya Iwamoto 2-5-13 Sanno, Ota-ku, Tokyo Inside Bencan Corporation

Claims (19)

[Claims] 1. An inner tube for transporting a fluid, a vacuum insulated tube fitted loosely on an outer peripheral portion of the inner tube, and heat transfer between an outer peripheral surface of the inner tube and an inner peripheral surface of the vacuum insulated tube. A heat transfer suppressing separating member provided between the inner pipe and the vacuum heat insulating cylinder so as to be able to suppressably separate and allow relative movement of the inner pipe and the vacuum heat insulating cylinder in the axial direction. Insulated pipe for fluid transport piping. 2. An inner tube for transporting a fluid, a vacuum insulation tube fitted loosely on the outer periphery of the inner tube, and heat transfer between the outer periphery of the inner tube and the inner periphery of the vacuum insulation tube. The heat transfer suppressing separation member provided between the inner pipe and the vacuum heat insulating cylinder so as to allow the relative displacement in the axial direction of the inner pipe and the vacuum heat insulating cylinder while allowing the space to be suppressed. A casing fitted in a loose state on an outer peripheral portion of the vacuum heat insulating cylinder, an outer peripheral surface of the vacuum heat insulating cylinder and an inner peripheral surface of the casing being separated so as to suppress heat transfer, and a shaft of the vacuum heat insulating cylinder and the casing. A heat transfer pipe for a fluid transport pipe, comprising: a heat transfer suppressing separation member provided between the vacuum heat insulating cylinder and the casing so as to allow relative movement in the direction. 3. A plurality of inner tubes are connected in a sealed state,
A plurality of vacuum insulation tubes are connected in a sealed state.
The heat insulating pipe for a fluid transport pipe according to the above. 4. A plurality of inner tubes are connected in a sealed state,
The heat insulating pipe for a fluid transport pipe according to claim 2, wherein the plurality of vacuum heat insulating cylinders are connected in a sealed state, and the plurality of casings are connected in a sealed state. 5. A vacuum heat insulating cylinder formed in a divisional shape by a sealing division surface passing through an axis at a connection portion between ends of the inner pipe, and the divided vacuum heat insulation cylinder is connected to the inner pipe. The heat insulating pipe for a fluid transport pipe according to claim 3, wherein the pipe is combined in a sealed state so as to straddle both outer sides of the portion. 6. At the connection between the ends of the inner tube, a vacuum heat-insulating cylinder formed in a split type with a sealing split surface passing through an axis and a casing formed in a split type with a split surface passing through an axis are used. The divided vacuum heat insulating cylinder is combined in a sealed state so as to straddle both outer sides of the connection portion of the inner tube, and the divided casing is combined in a sealed state outside the divided vacuum heat insulating cylinder. The heat insulating pipe for a fluid transport pipe according to claim 4. 7. A vacuum heat insulating cylinder used as a joint in a fluid direction changing portion is formed in a divided shape by a sealing division surface passing through an axis, and the divided vacuum heat insulating tube is sealed in an outer peripheral portion of an inner tube. The heat insulating pipe for a fluid transport pipe according to any one of claims 1, 3 and 5, which is combined. 8. A vacuum heat insulating cylinder of the above-mentioned split type, wherein the vacuum heat insulating cylinder and the casing used as joints in the fluid direction changing portion are formed by a sealing division surface passing through the axis and a division surface passing through the axis, respectively. The fluid according to any one of claims 2, 4, and 6, wherein the fluid is combined in a sealed state at an outer peripheral portion of the inner pipe, and the divided casing is combined with the outer peripheral portion of the divided vacuum insulation tube in a sealed state. Insulated pipe for transportation piping. 9. A vacuum heat insulating cylinder used as a joint at a fluid branching portion is formed into a split type by a sealing division surface passing through an axis, and this split type vacuum heat insulating cylinder is assembled in a sealed state at an outer peripheral portion of an inner tube. The heat insulating pipe for a fluid transport pipe according to any one of claims 1, 3, 5, and 7, wherein 10. A vacuum heat insulating cylinder and a casing used as a joint at a branch portion of a fluid are formed in a split type by a sealing division surface passing through an axis and a division surface passing through an axis, respectively. The fluid according to any one of claims 2, 4, 6, and 8, wherein the fluid is combined in a sealed state at an outer peripheral portion of the inner tube, and the divided casing is combined with a sealed condition at an outer peripheral portion of the divided vacuum heat insulating cylinder. Insulated pipe for transportation piping. 11. The fluid transport according to claim 3, wherein the inner tube, the vacuum insulation tube, and the heat transfer suppressing separation member are combined to form a unit, and a plurality of these units are used. Insulated pipe for plumbing. 12. A unit is formed by combining an inner tube, a vacuum insulation tube, a casing, and a heat transfer suppressing separation member,
The heat insulating pipe for a fluid transport pipe according to any one of claims 4, 6, 8, and 10, wherein the plurality of units are used. 13. The heat insulating pipe for a fluid transport pipe according to claim 3, wherein the joints at the ends of the vacuum heat insulating cylinder are formed in an annular uneven shape so as to be combined with each other. 14. The heat insulating pipe for a fluid transport pipe according to claim 3, wherein a joint portion at an end of the vacuum heat insulating cylinder includes a screw portion that is screwed together. 15. The heat insulating pipe for a fluid transport pipe according to claim 1, wherein the vacuum heat insulating cylinder has a bellows portion that can expand and contract along the axial direction. 16. The heat insulating pipe for a fluid transport pipe according to claim 1, wherein the vacuum heat insulating cylinder has a getter material in the vacuum heat insulating layer. 17. The heat insulating pipe for a fluid transport pipe according to claim 1, wherein the vacuum heat insulating cylinder has a radiation heat insulating material in the vacuum heat insulating layer. 18. The heat insulating pipe for a fluid transport pipe according to claim 1, wherein the heat transfer suppressing separation member is a linear or dot-like spacer capable of forming an air layer. 19. The heat insulating pipe for a fluid transport pipe according to claim 1, wherein the heat transfer suppressing separation member is a heat insulating material provided with a clearance.