JP6726129B2 - Pipe heat insulation device and construction method - Google Patents

Description

The present invention relates to a heat insulation device for pipes and a method for constructing the same.

BACKGROUND ART Conventionally, a heat insulating device for a pipe has been used in which the outer circumference of a heat insulating material attached to the pipe is covered with an exterior cover. The outer cover is composed of a plurality of metal plates arranged in the length direction of the pipe. At the joint between two adjacent metal plates, the ends of the metal plates overlap. However, there may be a gap between the two metal plates at the joint, and moisture (for example, rainwater) may intrude through the gap. When water enters through the gap, the heat insulating material contains the water, and the heat insulating performance of the heat insulating material deteriorates. In the heat retention device of Patent Document 1, drain holes are formed in the metal plate that is the exterior cover. According to this structure, the moisture of the heat insulating material can be discharged to the outside through the drain hole.

JP, 2011-27168, A

In order to effectively suppress the deterioration of the heat insulating performance of the heat insulating material in the device of Patent Document 1, high drainage efficiency is desired.

An object of the present disclosure is to provide a pipe heat insulating device capable of effectively suppressing a decrease in heat insulating performance of a heat insulating material, and a construction method thereof.

A pipe heat insulating device for solving the above problem has a heat insulating material that covers the outer circumference of the pipe, and a plurality of cover members that are arranged in the length direction of the pipe and that covers the outer circumference of the heat insulating material, and drainage is provided in the lower portion. And an exterior cover having a mouth. The exterior cover has a first edge portion and a second edge portion extending along the length direction of the pipe. The first edge portion and the second edge portion are separated from each other in the circumferential direction of the pipe, and a gap functioning as the drainage port is provided between the first edge portion and the second edge portion. Has been secured. According to this pipe heat insulating device, it is possible to effectively suppress the deterioration of the heat insulating performance of the heat insulating material. The pipe is not a component of this pipe heat insulating device.

Another pipe heat insulating device for solving the above problems, a heat insulating material that covers the outer periphery of the pipe, and a plurality of cover members that are arranged in the length direction of the pipe and that covers the outer periphery of the heat insulating material, on the lower side. An exterior cover having an open drainage port, and a spacer arranged between the outer surface of at least the lower portion of the heat insulating material and the inner surface of at least the lower portion of the exterior cover to secure a gap therebetween. Have and. According to this pipe heat insulating device, it is possible to effectively suppress the deterioration of the heat insulating performance of the heat insulating material. The pipe is not a component of this pipe heat insulating device.

A method for constructing a pipe heat insulating device for solving the above-mentioned problems is a first edge portion extending in the length direction of the pipe and an opposite portion extending in the length direction of the pipe and the first edge portion. A cover member having a second edge portion located on the side, covering the outer periphery of the heat insulating material attached to the outer periphery of the pipe, and the first edge portion and the second edge of the cover member. And a portion that is separated in the circumferential direction of the pipe to secure a gap that functions as a drainage port between the first edge portion and the second edge portion. According to this construction method, it is possible to effectively suppress the deterioration of the heat insulating performance of the heat insulating material.

Another construction method of the pipe heat insulating device for solving the above problems is a step of covering the outer circumference of the heat insulating material attached to the outer circumference of the pipe with an outer cover, the outer surface of at least the lower part of the heat insulating material and the outer cover. A step of securing a gap between the heat insulating material and the outer cover with a spacer arranged between at least the inner surface of the lower part of the outer cover, and a drain port opening downward to the outer cover. Including the step of providing. According to this construction method, it is possible to effectively suppress the deterioration of the heat insulating performance of the heat insulating material.

It is a perspective view which shows the example of the piping heat retention apparatus which concerns on the 1st Embodiment of this invention. It is sectional drawing of the piping heat retention apparatus shown in FIG. It is sectional drawing which shows another example of a cover member. It is sectional drawing which shows another example of a cover member. It is sectional drawing which shows another example of a cover member. It is a side view of the piping heat retention apparatus shown in FIG. It is a perspective view which shows the example of the piping heat retention apparatus which concerns on the 2nd Embodiment of this invention. It is sectional drawing of the piping heat retention apparatus shown in FIG. 5A. It is a perspective view which shows another example of the piping heat retention apparatus which concerns on the 2nd Embodiment of this invention. It is sectional drawing of the piping heat retention apparatus shown in FIG. 6A.

Hereinafter, embodiments of the present invention will be described. FIG. 1 is a perspective view showing a pipe heat insulation device 100 which is an example of a first embodiment of the present invention. In FIG. 1, a part of an exterior cover 30 described later is removed, and the heat insulating material 2 is exposed. FIG. 2 is a cross-sectional view of the pipe heat insulation device 100. In FIG. 2, the band 5 to be described later shown in FIG. 1 is omitted.

The heat retention device 100 is attached to the outer periphery of the pipe 90. A fluid (liquid, gas, etc.) having a temperature higher than the outside air temperature of the environment in which the heat retention device 100 is installed flows through the pipe 90. The temperature of the fluid flowing through the pipe 90 is 40 to 1000° C., for example. The heat retention device 100 suppresses the heat of the fluid flowing inside the pipe 90 from being transferred to the outside and maintains the temperature of the fluid.

As shown in FIG. 1, the heat insulating device 100 has a heat insulating material 2 (in other words, a heat insulating material) that covers the outer periphery of the pipe 90. The heat insulating material 2 has a cylindrical shape, and the pipe 90 is arranged inside thereof. The heat insulating material 2 surrounds the entire circumference of the pipe 90. In the example of the heat insulating device 100, the diameter of the inner surface of the heat insulating material 2 corresponds to the diameter of the pipe 90, and the inner surface of the heat insulating material 2 is in contact with the pipe 90. A gap (air layer) may be provided between the inner surface of the heat insulating material 2 and the outer surface of the pipe 90.

The heat insulating material 2 is made of, for example, an inorganic porous material or an inorganic fiber material, and has water absorbability and vapor permeability. Examples of the porous material include calcium silicate and perlite. These materials have a structure in which air bubbles are continuous, and have water absorbency and water vapor permeability. Examples of the fiber material include rock wool, which is an artificial mineral fiber, and glass wool, which is formed of glass fiber. The material of the heat insulating material 2 may be selected according to the temperature of the fluid flowing through the pipe 90, for example.

As shown in FIG. 2, the heat insulating material 2 is composed of, for example, a plurality of blocks 2a and 2b which are combined with each other in a direction orthogonal to the pipe 90. In the example of FIG. 2, the heat insulating material 2 includes a block 2 a that covers the upper side of the pipe 90 and a block 2 b that covers the lower side of the pipe 90. The structure of the heat insulating material 2 is not limited to the example shown in FIG. For example, the heat insulating material 2 may include a block that covers the left side of the pipe 90 and a block that covers the right side of the pipe 90.

The heat retention device 100 has an exterior cover 30 that covers the outer periphery of the heat insulation material 2. The exterior cover 30 can protect the heat insulating material 2 and improve the appearance of the heat insulating device 100. The exterior cover 30 is composed of a plurality of cover members 31 arranged side by side in the length direction of the pipe 90 (the “length direction” of the pipe 90 is the direction DL shown in FIG. 1). Each cover member 31 is a cylindrical member, and the heat insulating material 2 is arranged inside thereof. At the joint between two adjacent cover members 31, their ends 31a, 31a overlap (see FIG. 1). In the example of the heat retention device 100, the cover member 31 is a metal plate. The cover member 31 is, for example, a metal plate such as a colored plated steel plate, a stainless steel plate, or an aluminum steel plate.

Water (for example, rainwater) may infiltrate from the joint of the cover members 31, that is, from the gap between the end portions of two adjacent cover members 31, and the water may permeate the heat insulating material 2. A drain port E1 is provided in a lower portion of the exterior cover 30 (in other words, the cover member 31). The moisture that has penetrated into the heat insulating material 2 becomes steam due to the heat from the pipe 90, and comes into contact with the inner surface of the exterior cover 30 to become droplets. The droplets flow downward along the inner surface of the exterior cover 30 and are discharged from the drainage port E1. As a result, the heat insulating material 2 can be dried in a relatively short time. Part of the moisture that has penetrated into the heat insulating material 2 becomes steam due to the heat from the pipe 90, and is discharged from the drainage port E1 as steam.

As shown in FIG. 2, the outer cover 30 is located on the first edge 31A extending in the lengthwise direction of the pipe 90 and on the side opposite to the first edge 31A extending in the lengthwise direction of the pipe 90. It has the 2nd edge part 31B. The first edge portion 31A and the second edge portion 31B are separated from each other in the circumferential direction of the pipe 90. Then, a gap that functions as the above-described drainage port E1 is secured between the first edge portion 31A and the second edge portion 31B (the “circumferential direction” of the pipe 90 is indicated by Dr in FIG. 2). Exist). By doing so, the opening area of the drainage port E1 can be sufficiently secured, and the efficiency of draining water can be improved. Further, the drainage port E1 is an opening that opens downward in the vertical direction. Therefore, it is possible to prevent the protective function of the heat insulating material 2 of the outer cover 30 from being damaged by the drainage port E1.

As shown in FIG. 2, each cover member 31 is a member that is continuous in the circumferential direction of the pipe 90, and has a first edge portion 31A and a second edge portion 31B. In the example of the heat retaining device 100, each cover member 31 is a single metal plate wound around the outer periphery of the heat retaining material 2 and curved in a cylindrical shape. The two edges of one metal plate are the above-mentioned edge portions 31A and 31B. The width of each cover member 31 (in other words, the distance from the first edge 31A to the second edge 31B) is such that the drainage port E1 is formed when the cover member 31 is wound around the outer periphery of the heat insulating material 2. Is set to. According to this structure, the number of steps for forming the cover member 31 can be reduced. For example, when the hole formed in the metal plate is used as a drainage port, machining for forming the hole in the metal plate is required. However, according to the structure of the outer cover 30, it is possible to reduce such machining. You can

The structure of the outer cover 30 is not limited to the example of the heat retention device 100. For example, each cover member 31 may be composed of a plurality of metal plates. For example, two semi-cylindrical metal plates may be connected to form one cylindrical cover member 31. In this case, one metal plate may have the above-mentioned first edge portion 31A, and the other metal plate may have the above-mentioned second edge portion 31B.

As still another example, the cover member 31 may have a laminated structure. For example, the cover member 31 includes a metal film (or a metal plate) forming the outer surface thereof, a metal film (or a metal plate) forming the inner surface thereof, and a heat insulating material (heat insulating material) filled between them. The sheet may have.

As still another example, the drainage port E1 may not necessarily be provided in a part of the cover members 31 of the plurality of cover members 31 forming the exterior cover 30. For example, when the cover member 31 is shorter than the other cover members 31 among the plurality of cover members 31, the drain port E1 does not have to be provided in the short cover member 31.

The drainage port E1 is an opening extending in the length direction of the pipe 90. In other words, the drainage port E1 has an elongated slit shape in the length direction of the pipe 90. For example, each cover member 31 has a drainage port E1 over the entire length of the cover member 31. That is, the drainage port E1 continues from one end portion 31a (see FIG. 1) of the cover member 31 to the other end portion 31a (see FIG. 1) (the two end portions 31a are in the longitudinal direction of the pipe 90). At the opposite ends of each other). That is, the first edge portion 31A and the second edge portion 31B linearly extend from one end portion 31a of the cover member 31 to the other end portion 31a. With such a shape of the cover member 31, its manufacture can be facilitated.

As another example, the drainage port E1 is provided only in a part of the cover member 31 in the length direction of the pipe 90, and in the other part of the cover member 31, the first edge portion 31A and the second edge portion 31B overlap. May be. In this case, a plurality of drainage ports E1 may be provided in each cover member 31, and a plurality of drainage ports E1 may be arranged at intervals in each cover member 31. For example, two drainage ports E1 may be provided in the cover member 31. In other words, in the central portion of the cover member 31, the first edge portion 31A and the second edge portion 31B may overlap each other. As still another example, in the end portion 31a of the cover member 31, the first edge portion 31A and the second edge portion 31B may overlap each other.

When the length of the cover member 31 is L, the drainage port E1 is provided in the cover member 31 over a distance of, for example, L/5 or more, preferably L/3 or more, and more preferably L/2 or more. It is preferable (the length of the cover member 31 is the length of the pipe 90 in the length direction). More preferably, the drainage port E1 is provided in the cover member 31 over a distance of L/2 or more. The length of the drainage port E1 is not necessarily limited to the example described here. That is, the length of the drainage port E1 may be smaller than L/3. In the description here, the length of the drainage port E1 is the total length of the plurality of drainage ports E1 when the plurality of drainage ports E1 are provided in one cover member 31.

The total opening area of the drainage ports E1 per meter of the cover member 31 is preferably, for example, 20 square centimeters or more. For example, when the width W1 (see FIG. 2) of the drainage port E1 is 1 cm, the length of the drainage port E1 is preferably 20 cm or more. It is more preferable that the total opening area of the drainage ports E1 per meter of the cover member 31 is 50 square centimeters or more.

The width W1 (FIG. 2) of the drainage port E1 is set to a range in which moisture is smoothly discharged from the drainage port E1 and the protective function of the heat insulating material 2 by the outer cover 30 is secured. The width W1 of the drainage port E1 is, for example, 5 mm or more and 100 mm or less, preferably 5 mm or more and 50 mm or less.

In the example of the heat retention device 100, the width W1 of the drainage port E1 is substantially uniform in the lengthwise direction of the drainage port E1 (the lengthwise direction of the pipe 90). The width W1 of the drainage port E1 may be gradually changed in the length direction of the pipe 90.

As shown in FIG. 2, in the example of the heat retention device 100, the drainage port E1 is provided at the lowest position in the exterior cover 30. In other words, the drainage port E1 is located below the pipe 90 in the vertical direction. According to this, the water on the inner surface of the exterior cover 30 can be smoothly discharged from the drain port E1. The drainage port E1 may be displaced from the position directly below the pipe 90 as long as the water content is drained from the drainage port E1.

As described above, the cover member 31 is made of a metal plate. As shown in FIG. 2, in the example of the heat retention device 100, the edge portions 31A and 31B of the cover member 31 are end surfaces of the metal plate. 3A to 3C are diagrams showing modified examples of the edge portions 31A and 31B of the cover member 31. As shown in FIG. 3A, the edges 31A and 31B may be bent along a line along the length direction of the pipe 90. By this bending process, unnecessary bending of the cover member 31 (in other words, the metal plate) can be suppressed, and as a result, the work of winding the cover member 31 around the outer periphery of the heat insulating material 2 can be facilitated. In the example of FIG. 3A, each of the first edge portion 31A and the second edge portion 31B is bent by two lines along the length direction of the pipe 90 (that is, each of the first edge portions 31A and 31B). Is bent twice). Therefore, each of the 1st edge part 31A and the 2nd edge part 31B is the 1st folding|returning part 31c folded back on the opposite side to the drainage port E1, and the 2nd folding|returning part 31d folded back toward the drainage port E1. And have. In the example of FIG. 3A, the second folded portion 31d is located below the first folded portion 31c.

As another example, as shown in FIG. 3B, the second folded-back portion 31d may be folded back so as to be located above the first folded-back portion 31c. In still another example, the edge portions 31A and 31B do not necessarily have to have the second folded portion 31d. That is, the edges 31A and 31B of the metal plate that is the cover member 31 may be bent only once. As still another example, as shown in FIG. 3C, each of the edge portions 31A and 31B may have a collar portion 31e extending downward instead of the folded portions 31c and 31d.

As shown in FIG. 2, a gap G1 is provided between the outer surface of the heat insulating material 2 and the inner surface of the exterior cover 30. The gap G1 is provided at the position of the drainage port E1 in the circumferential direction of the pipe 90. That is, the gap G1 is provided between the outer surface of the lower portion of the heat insulating material 2 and the inner surface of the lower portion of the exterior cover 30. Due to this gap G1, the moisture adhering to the inner surface of the outer cover 30 flows smoothly toward the drainage port E1.

As shown in FIG. 2, a spacer 4 for securing a gap G1 is provided between the outer surface of the heat insulating material 2 and the inner surface of the exterior cover 30. The spacer 4 is a member having a thickness corresponding to the size of the gap G1. The spacer 4 is adhered to the inner surface of the cover member 31, for example. The spacer 4 may be adhered to the outer surface of the heat insulating material 2. In the example of the heat insulating device 100, the spacer 4 is arranged only between the outer surface of the lower portion of the heat insulating material 2 and the inner surface of the lower portion of the exterior cover 30. The width of the spacer 4 is sufficiently smaller than the width of the outer cover 30 in the circumferential direction of the pipe 90 (the distance from the first edge portion 31A to the second edge portion 31B).

Further, in the example of the heat retention device 100, the plurality of spacers 4 are arranged in the length direction of the pipe 90. The plurality of spacers 4 are arranged at intervals along the drainage port E1. More specifically, the plurality of spacers 4 includes the spacers 4 arranged along the first edge portion 31A and the spacers 4 arranged along the second edge portion 31B. The width of each spacer 4 in the length direction of the pipe 90 is sufficiently smaller than the length of the drainage port E1. The arrangement of the spacers 4 is not limited to the example of the heat retention device 100. For example, the spacer 4 may be arranged at the position of the drainage port E1. That is, the spacer 4 may extend from the portion on the first edge 31A side to the portion on the second edge 31B side.

The material of the spacer 4 preferably has heat insulating properties and flexibility. For example, as the material of the spacer 4, a fiber material such as rock wool or glass wool can be used. The spacer 4 may be a fiber heat insulating material having water vapor permeability and water impermeability. The material of the spacer 4 may have water repellency.

The size of the gap G1 may be set in accordance with the water discharge efficiency (in other words, the ease with which the water attached to the inner surface of the exterior cover 30 flows). In one example, the gap G1 at the edges 31A and 31B is preferably 5 mm or more. The gap G1 at the edge portions 31A and 31B may be 7 mm or more.

As described above, in the example of the heat insulating device 100, the spacer 4 is arranged only between the outer surface of the lower portion of the heat insulating material 2 and the inner surface of the lower portion of the exterior cover 30. The spacer 4 is not arranged between the upper portion of the heat insulating material 2 and the upper portion of the exterior cover 30. Therefore, the gap G1 is not provided between the uppermost part of the heat insulating material 2 and the uppermost part of the exterior cover 30. The size of the gap G1 increases as it approaches the drainage port E1.

When the gap G1 at the edge portions 31A and 31B is 5 mm or more, the gap G1 of 5 mm or more is provided, for example, over an angle of 60 degrees or more in the circumferential direction of the pipe 90. By doing so, the moisture adhering to the inner surface of the exterior cover 30 smoothly flows toward the drainage port E1. The gap G1 of 5 mm or more may be provided over an angle larger than 60 degrees.

The spacer 4 and the gap G1 are not limited to the example of the heat retention device 100. For example, the size of the gap G1 may be substantially uniform in the circumferential direction of the pipe 90. That is, the size of the gap G1 may be substantially uniform over 360 degrees around the heat insulating material 2. In this case, the plurality of spacers 4 may be evenly arranged between the outer surface of the heat insulating material 2 and the inner surface of the exterior cover 30. For example, when the cross section of the heat retention device 100 is viewed, the plurality of spacers 4 may be arranged at intervals in the circumferential direction of the pipe 90. In still another example, the spacer 4 may be an annular member that surrounds the heat insulating material 2.

In still another example, a mesh member having a thickness corresponding to the gap G1 and allowing the passage of moisture or gas may be used as the spacer 4. In this case, the spacer 4 may surround the entire outer surface of the heat insulating material 2, or may be provided only on a part of the outer surface of the heat insulating material 2.

The heat insulating device 100 has a fixing member that fixes the cover member 31 to the heat insulating material 2 outside the cover member 31. As shown in FIG. 1, as the fixing member, for example, the band 5 wound around the outside of the cover member 31 can be used. In the example of the heat retention device 100, a plurality of bands 5 are arranged along the length direction of the pipe 90. By tightening the band 5, the cover member 31 can be fixed to the heat insulating material 2. According to this structure, the cover member 31 can be fixed by a relatively simple operation.

FIG. 4 is a side view of the pipe heat insulation device 100. As shown in this figure, it is desirable that the position of the fixing member (that is, the band 5) in the length direction of the pipe 90 matches the position of the spacer 4. That is, it is preferable that the spacer 4 is located inside the band 5. By doing so, when the band 5 is tightened, the outer cover 30 can be firmly fixed to the heat insulating material 2 while securing the gap G1 by the spacer 4. Note that, as shown in FIG. 3C, each of the edge portions 31A and 31B may have a flange portion 31e extending downward. In this case, a notch that avoids the band 5 may be formed in the collar portion 31e.

The fixing member that fixes the cover member 31 is not limited to the band 5. For example, the heat retention device 100 may have, as a fixing member, a plate that is bridged between the first edge portion 31A side portion and the second edge portion 31B side portion of the cover member 31 and fixed to both. .. In this case, a screw or the like can be used to fix the plate to the cover member 31. Also in this case, the position of the plate may coincide with the position of the spacer 4. In still another example, each of the first edge portion 31A and the second edge portion 31B of the cover member 31 may be formed with a portion that is folded back to the side opposite to the drainage port E1 (this folded back portion will be described below. That part is called the hook part). Then, the hook portion formed on the first edge portion 31A side and the hook portion formed on the second edge portion 31B side may be connected by a plate.

A construction method of the heat retention device 100 will be described. Note that this construction method may be used when the heat retaining device 100 is installed in the pipe 90 not provided with the heat retaining device, or the heat retaining device 100 is installed in the pipe 90 already provided with another heat retaining device. It may be used when doing.

When no other heat retaining device is installed in the pipe 90 (when the pipe 90 is exposed), first, the outer periphery of the pipe 90 is covered with the heat insulating material 2. As shown in FIG. 2, when the heat insulating material 2 is composed of a plurality of blocks 2 a and 2 b, the blocks 2 a and 2 b are attached to the outer circumference of the pipe 90. When another heat retaining device is already installed in the pipe 90, first, the outer cover of this heat retaining device is removed to expose the heat retaining material 2 of the heat retaining device.

A plurality of cover members 31 having a first edge portion 31A and a second edge portion 31B are prepared. The cover member 31 is, for example, a flat metal plate. At this time, the spacer 4 described above may be adhered to the cover member 31. Instead of this, the spacer 4 may be adhered to the outer surface of the heat insulating material 2.

Then, the cover member 31 covers the outer periphery of the heat insulating material 2. At this time, the first edge portion 31A and the second edge portion 31B of the cover member 31 are separated from each other in the circumferential direction of the pipe 90, and a gap (drainage port E1) is formed between the first edge portion 31A and the second edge portion 31B. The cover member 31 is wrapped around the outer periphery of the heat insulating material 2 so as to occur. That is, the width of the cover member 31 (the distance from the first edge portion 31A to the second edge portion 31B) is set so that such a gap is generated.

Next, the cover member 31 is fixed to the heat insulating material 2 by the fixing member such as the band 5 described above. At this time, the position of the band 5 in the length direction of the pipe 90 is matched with the position of the spacer 4. As described above, since the spacer 4 is arranged between the inner surface of the cover member 31 and the outer surface of the heat insulating material 2, the gap G1 is secured between them.

The plurality of cover members 31 are sequentially attached to the outer periphery of the heat insulating material 2 by the method described above. At this time, the cover member 31 is attached to the heat insulating material 2 so that the end portion of the cover member 31 overlaps the end portion of the adjacent cover member 31. The above is an example of the construction method of the heat retention apparatus 100.

A second embodiment of the present invention will be described. FIG. 5A is a perspective view of a pipe heat insulating device 200 that is an example of the pipe heat insulating device according to the second embodiment. FIG. 5B is a cross-sectional view of the pipe heat insulation device 200. In these figures, the same parts as those described so far are designated by the same reference numerals. Below, it demonstrates centering around a different point from the heat retention apparatus 100 mentioned above. Matters not described for the heat retention device 200 are the same as those of the heat retention device 100.

In the example of the heat insulating device 200, the outer periphery of the heat insulating material 2 is covered with the exterior cover 230. The outer cover 230 has a plurality of cover members 231 arranged in the length direction of the pipe 90. Each cover member 231 is a metal plate, like the cover member 31 described above.

As shown in FIG. 5A, the exterior cover 230 is provided with a drain port E2 that opens downward. In the example of the heat retention device 200, the two adjacent cover members 231 are separated from each other in the length direction of the pipe 90. Therefore, a gap that functions as the drainage port E2 is provided between two adjacent cover members 231. That is, the drainage port E2 is provided between the edge portion 231a of the one cover member 231 and the edge portion 231a of the other cover member 231. The drainage port E2 extends in the circumferential direction of the pipe 90. For example, the drainage port E2 is provided around the heat insulating material 2 at an angle of 60 degrees or more.

The moisture that has penetrated into the heat insulating material 2 becomes steam due to the heat from the pipe 90, and comes into contact with the inner surface of the exterior cover 230 to become droplets. The droplets flow down along the inner surface of the outer cover 230 and collect at the lowest position P2 of the outer cover 230. The water can be discharged from the drain port E2. As a result, the heat insulating material 2 can be dried in a relatively short time. Part of the moisture that has permeated the heat insulating material 2 becomes steam due to the heat from the pipe 90, and is discharged from the drainage port E2 as steam.

The width W2 of the drainage port E2 in the length direction of the pipe 90 is a size that allows water to be smoothly drained from the drainage port E2. The width W2 of the drainage port E2 is, for example, L/20 or more. The width W2 of the drainage port E2 may be, for example, L/10 or more.

As shown in FIG. 5B, the exterior cover 230 does not have the above-described drainage port E1. The cover member 231 surrounds the outer surface of the heat insulating material 2 over the entire circumference. One edge 231c and the other edge 231d of the cover member 231 are crimped and fixed to each other.

As shown in FIG. 5B, also in the example of the heat insulating device 200, the spacer 4 is arranged between the outer surface of the lower portion of the heat insulating material 2 and the inner surface of the lower portion of the exterior cover 230. A gap G2 is secured by the spacer 4. The spacer 4 is a member having a thickness corresponding to the size of the gap G2. Due to this gap G2, the water attached to the inner surface of the exterior cover 230 can be discharged from the drainage port E2 in a relatively short time.

In the example of the heat insulating device 200, the spacer 4 is arranged only between the outer surface of the lower portion of the heat insulating material 2 and the inner surface of the lower portion of the outer cover 230, and the upper portion of the heat insulating material 2 and the upper side of the outer cover 230. It is not placed between the parts. Therefore, also in the example of the heat insulating device 200, the gap G2 is not provided between the uppermost part of the heat insulating material 2 and the uppermost part of the exterior cover 30. The gap G2 increases as it approaches the lowest position P2 on the exterior cover 230. In the example of the heat retention device 200, the spacer 4 is displaced in the circumferential direction of the pipe 90 with respect to the lowest position P2. As a result, it is possible to prevent the spacer 4 from absorbing the water accumulated at the position P2. In the example of the heat retention device 200, the two spacers 4 are arranged on the opposite sides of the position P2. In the example of the heat insulating device 200 as well, similar to the heat insulating device 100, the plurality of spacers 4 arranged in the length direction of the pipe 90 are arranged between the outer surface of the heat insulating material 2 and the inner surface of the exterior cover 230.

The size of the gap G2 may be set according to the efficiency of water discharge (in other words, the ease with which the water attached to the inner surface of the exterior cover 230 flows). In one example, the gap G2 at the position P2 is preferably 5 mm or more. The gap G2 at the position P2 may be 7 mm or more. When the gap G2 at the position P2 is, for example, 5 mm or more, the gap G2 of 5 mm or more is ensured over an angle of 60 degrees or more in the circumferential direction of the pipe 90, for example.

The spacer 4 and the gap G2 are not limited to the example of the heat retention device 200. For example, the size of the gap G2 may be substantially uniform in the circumferential direction of the pipe 90. In this case, the plurality of spacers 4 may be evenly arranged between the outer surface of the heat insulating material 2 and the inner surface of the exterior cover 230. For example, the plurality of spacers 4 may be arranged at intervals in the circumferential direction of the pipe 90 when the cross section of the heat retention device 200 is viewed. As still another example, the spacer 4 of the heat insulating device 200 may be an annular member that surrounds the heat insulating material 2.

Further, as the spacer 4, a net-like member having a thickness corresponding to the gap G2 and allowing the passage of moisture or gas may be used. In this case, the spacer 4 may surround the entire outer surface of the heat insulating material 2, or may be provided only on a part of the outer peripheral surface of the heat insulating material 2.

As shown in FIG. 5A, a fixing member for fixing the two adjacent cover members 231 to each other is attached. This can prevent the relative positions of the two cover members 231 from changing relative to each other when the heat retention device 200 is used for a long period of time. As a result, the width W2 of the drainage port E2 is maintained even when the heat retention device 200 is used for a long period of time.

In the example of the heat retention device 200, the connection plate 205 is provided as the above-mentioned fixing member. The connecting plate 205 is stretched over the two cover members 231 and is fixed to the two cover members 231 by screws, for example. The connection plate 205 is, for example, a metal plate. The connection plate 205 is formed so as to cover the upper side of the heat insulating material 2. The connection plate 205 covers the upper side of the heat insulating material 2 over an angle of, for example, 180 degrees or more. According to such a connecting plate 205, the whole heat insulating material 2 is covered by the connecting plate 205 when the heat insulating device 200 is viewed in plan, and the heat insulating material 2 can be protected by the connecting plate 205. The range covered by the connecting plate 205 does not necessarily have to be 180 degrees or more.

A construction method of the heat retention device 200 will be described. Note that this construction method may also be used when the heat retaining device 200 is installed in the pipe 90 not provided with the heat retaining device, or the heat retaining device 200 is installed in the pipe 90 already provided with another heat retaining device. It may be used when doing.

When no other heat retaining device is installed in the pipe 90 (when the pipe 90 is exposed), first, the outer periphery of the pipe 90 is covered with the heat insulating material 2. As shown in FIG. 5A, when the heat insulating material 2 is composed of a plurality of blocks 2 a and 2 b, the blocks 2 a and 2 b are attached to the outer circumference of the pipe 90. When another heat retaining device is already installed in the pipe 90, first, the outer cover of the heat retaining device is removed to expose the heat retaining material 2 of the heat retaining device.

A plurality of cover members 231 are prepared. The cover member 231 is, for example, a flat metal plate. At this time, the spacer 4 described above may be adhered to the inner surface of the cover member 231. The spacer 4 may be adhered to the outer surface of the heat insulating material 2.

Then, the cover member 231 covers the outer periphery of the heat insulating material 2. Then, as shown in FIG. 5B, the edge portions 231c and 231d of the cover member 231 are caulked to fix them to each other. As a result, the entire circumference of the heat insulating material 2 is covered with the cover member 231. As described above, since the spacer 4 is arranged between the inner surface of the cover member 231 and the outer surface of the heat insulating material 2, the gap G2 is secured between them.

Next, the outer periphery of the heat insulating material 2 is covered with the adjacent cover member 231 by the same method as described above. Then, the edge portions 231c and 231d of the cover member 231 are caulked to fix them to each other. At this time, the two cover members 231 are separated by a predetermined distance, and the drain port E2 is secured between them. Then, the two cover members 231 are fixed to each other by the connecting plate 205. That is, the connecting plate 205 is fixed to the two cover members 231 with screws, for example. The above is an example of the construction method of the heat retention apparatus 200.

6A and 6B are perspective views of a heat retaining device 200A which is another example of the heat retaining device according to the second embodiment. In this figure, the same parts as those described so far are designated by the same reference numerals. Below, it demonstrates centering around a different point from the heat retention apparatus 200 mentioned above. Matters not described for the heat retaining device 200A are the same as those for the heat retaining device 200.

In the heat retention device 200A, like the heat retention device 200, the two adjacent cover members 231 are separated from each other in the length direction of the pipe 90, and the drain port E2 is provided between them. Two adjacent cover members 231 are fixed to each other by a fixing member. In the example of the heat retaining device 200A, two adjacent cover members 231 are fixed to each other by a plurality of connecting plates 205A arranged in the circumferential direction of the pipe 90 (as shown in FIG. 6B, in the example of the heat retaining device 200A, Three connecting plates 205A are utilized). Unlike the above-mentioned connecting plate 205, each connecting plate 205A is a metal plate elongated in the length direction of the pipe 90. The connection plate 205A is fixed to the cover member 231 with a screw, for example. A part of the heat insulating material 2 is visible when the heat insulating device 200A is viewed in a plan view. Therefore, in the example of the heat retention device 200A, the drainage port E2 is opened not only on the lower side but also on the right side and the left side. As shown in FIG. 6B, the position of the connecting plate 205A is displaced in the circumferential direction of the pipe 90 with respect to the lowest position P2 of the exterior cover 230. Instead of the example of the heat retention device 200A, one of the plurality of connection plates 205A may be fixed to the lowest position P2 of the exterior cover 30.

The construction method of the heat retention device 200A is substantially the same as that of the heat retention device 200. The difference is that instead of the connecting plate 205, the plurality of connecting plates 205A described above are fixed to two adjacent cover members 231.

The present invention is not limited to the embodiment described above, and various modifications can be made.

For example, the cover members 31, 231 may have a laminated structure. For example, the cover members 31, 231 have a metal film (or a metal plate) forming the outer surface thereof, a metal film (or a metal plate) forming the inner surface thereof, and a heat insulating material (heat insulating material) filled between them. A sheet having and may be used.

2 heat insulating material, 4 spacer, 5 band (fixing member), 30 exterior cover, 31 cover member, 31A first edge portion, 31B second edge portion, 31c folded portion, 31d folded portion, 31e collar portion, 90 pipe, 100 Pipe heat retaining device, 200 pipe heat retaining device, 200A pipe heat retaining device, 205 connecting plate, 205A connecting plate, 230 exterior cover, 231 cover member, 231a edge portion, 231c edge portion, 231d edge portion.

Claims (10)

A heat insulating material that covers the outer circumference of the pipe,
Arranged in the length direction of the pipe, and having a plurality of cover members for covering the outer periphery of the heat insulating material, and an exterior cover having a drainage port on the lower portion,
The exterior cover has a first edge portion and a second edge portion extending along the length direction of the pipe,
The first edge portion and the second edge portion are separated from each other in the circumferential direction of the pipe, and a gap functioning as the drainage port is provided between the first edge portion and the second edge portion. A heat insulation device for pipes characterized by being secured. Each of the plurality of cover members is a member continuous in the circumferential direction of the pipe,
At least 1 of the said several cover member has the said 1st edge part and the said 2nd edge part. The piping heat retention apparatus of Claim 1 characterized by the above-mentioned. The pipe heat insulating device according to claim 2, wherein each of the plurality of cover members is a single metal plate. The pipe heat insulating device according to claim 1, wherein a gap is provided between an outer surface of at least a lower portion of the heat insulating material and an inner surface of at least a lower portion of the exterior cover. The pipe heat insulating device according to claim 4, wherein at least one spacer for securing the gap is arranged between an outer surface of the heat insulating material and an inner surface of the exterior cover. A heat insulating material that covers the outer circumference of the pipe,
An outer cover having a plurality of cover members arranged in the lengthwise direction of the pipe and covering the outer periphery of the heat insulating material, and having a drain port opened to the lower side,
At least one spacer disposed between an outer surface of at least a lower portion of the heat insulating material and an inner surface of at least a lower portion of the exterior cover, and at least one spacer Is provided between the outer surface of the lower portion of the heat insulating material and the inner surface of the lower portion of the outer cover, and between the outer surface of the upper portion of the heat insulating material and the inner surface of the upper portion of the outer cover. Not provided ,
The exterior cover has a first edge portion and a second edge portion extending along the length direction of the pipe,
The first edge portion and the second edge portion are separated from each other in the circumferential direction of the pipe, and a gap functioning as the drainage port is provided between the first edge portion and the second edge portion. A pipe heat insulation device characterized by being secured . The pipe heat insulation device according to claim 6 , wherein a plurality of spacers arranged along the drainage port are provided as the at least one spacer. A cover member having a first edge portion extending in the length direction of the pipe and a second edge portion extending in the length direction of the pipe and located on the opposite side of the first edge portion, A step of covering the outer periphery of the heat insulating material attached to the outer periphery of the pipe, and the first edge portion and the second edge portion of the cover member are separated from each other in the circumferential direction of the pipe to form the first edge portion. A method for constructing a pipe heat insulation device, comprising a step of ensuring a gap functioning as a drainage port between an edge portion and the second edge portion. In the step of covering the outer periphery of the heat retaining material with the cover member, the outer periphery of the heat retaining material is covered with the cover member while ensuring a gap between the outer surface of the heat retaining material and the inner surface of the cover member. The method for constructing the pipe heat insulation device according to claim 8 . An exterior cover having a first edge portion extending in the length direction of the pipe and a second edge portion extending in the length direction of the pipe and located on the opposite side of the first edge portion, cormorant process covering the outer periphery of the heat insulator attached to the outer circumference of the pipe,
Securing a gap between the heat insulating material and the outer cover with at least one spacer arranged between the outer surface of at least the lower portion of the heat insulating material and the inner surface of at least the lower portion of the outer cover, The at least one spacer is provided between an outer surface of a lower portion of the heat insulating material and an inner surface of a lower portion of the outer cover, and an outer surface of an upper portion of the heat insulating material and an inner surface of an upper portion of the outer cover. Process not provided between, and
The first edge portion and the second edge portion of the outer cover are separated from each other in the circumferential direction of the pipe, and are directed downward between the first edge portion and the second edge portion. A method of constructing a pipe heat insulation device, comprising the step of providing a gap that functions as a drainage port in the exterior cover in the exterior cover.

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