JP2023030260A - Pipe, manufacturing method for pipe, hot water storage tank unit, and manufacturing method for hot water storage tank unit - Google Patents

Abstract

To provide a pipe that can be easily connected to another pipe even if being covered with a heat insulation material.SOLUTION: A pipe comprises: a pipe part 32 comprising a first terminal part 32f formed at one end, and a second terminal part 32g formed at the other end; a first plate part 35 comprising an insertion hole into which the pipe part 32 is inserted, provided closer to the center of the pipe part 32 than the first terminal part 32f, and of which one surface 35a is directed toward the first terminal part 32f; a second plate part 36 comprising an insertion hole into which the pipe part 32 is inserted, provided closer to the center of the pipe part 32 than the second terminal part 32g, and of which one surface 36a is directed toward the second terminal part 32g; and a heat insulation part 55 covering an area from the first plate part 35 to the second plate part 36 in the pipe part 32, and in contact with the other surface of the first plate part 35 and the other surface of the second plate part 36.SELECTED DRAWING: Figure 6

Description

TECHNICAL FIELD The present disclosure relates to a pipe, a method of manufacturing the pipe, a hot water tank unit, and a method of manufacturing the hot water tank unit.

2. Description of the Related Art A hot water storage type water heater is widely known in which hot water boiled by an outdoor unit, which is a heating means, is stored in a hot water storage tank unit through a pipe. In such a hot water storage type water heater, in order to reduce heat radiation loss of stored hot water, generally the hot water storage tank is covered with a heat insulating material. Further, Patent Literature 1 discloses a technique for reducing heat radiation loss from piping by integrally molding the piping with a heat insulating material.

Japanese Patent No. 6200804

However, when the technique of integrally molding a pipe and a heat insulating material disclosed in Cited Document 1 is used, the end portion of the pipe may be buried in the heat insulating material, making it difficult to connect the pipe.

The present disclosure has been made in order to solve the above problems, a pipe that can be easily connected to another pipe even if it is covered with a heat insulating material, a method for manufacturing this pipe, this An object of the present invention is to provide a hot water storage tank unit using piping and a method for manufacturing this hot water storage tank unit.

A pipe according to the present disclosure has a pipe portion having a first terminal portion formed at one end and a second terminal portion formed at the other end, an insertion hole through which the pipe portion is inserted, and a first terminal A first plate part provided closer to the center of the piping part than the part, one surface facing the first terminal part, and an insertion hole through which the piping part is inserted, the piping part being closer to the second terminal part A second plate portion provided near the center of the and one surface facing the second terminal portion, and covering the range from the first plate portion to the second plate portion in the piping portion, and the other side of the first plate portion a heat insulating portion in contact with the surface and the other surface of the second plate portion.

According to the present disclosure, a portion of the pipe portion is covered with the heat insulating portion, while the first terminal portion and the second terminal portion formed at the ends are not covered with the heat insulating portion. Thus, to provide a pipe that can be easily connected to another pipe even if it is covered with a heat insulating material, a method for manufacturing this pipe, a hot water storage tank unit using this pipe, and a method for manufacturing this hot water storage tank unit. be able to.

1 is a perspective view of a hot water storage tank unit according to Embodiment 1 of the present disclosure; FIG. Front view of hot water storage tank unit viewed from arrow II shown in FIG. Cross-sectional view of the hot water storage tank unit cut along the III-III line shown in FIG. Plan view of hot water storage tank unit viewed from arrow IV shown in FIG. Cross-sectional view of the hot water storage tank unit cut along the VV line shown in FIG. FIG. 2 is a perspective view of a first central heat insulating material included in the hot water storage tank unit shown in FIG. 1 ; Cross-sectional view of the first central heat insulating material cut along the VII-VII line shown in FIG. FIG. 4 is a diagram showing a central hot water supply pipe provided in a first central heat insulating material, (a) is a perspective view, and (b) is a perspective view of a plate portion attached to the central hot water supply pipe. Cross-sectional views showing the manufacturing process of the first central heat insulating material shown in FIG. 6 in the order of steps ((a) to (b)) Cross-sectional view showing the manufacturing process of the first central heat insulating material continuing from FIG. 9 in the order of process ((a) to (b)) A perspective view showing a central hot water supply pipe provided in a hot water storage tank unit according to Embodiment 2 of the present disclosure.

Hereinafter, a pipe, a method for manufacturing the pipe, a hot water tank unit, and a method for manufacturing the hot water tank unit according to preferred embodiments of the present disclosure will be described with reference to the drawings.

(Embodiment 1)
As shown in FIG. 1, the hot water storage tank unit 1 includes a hot water storage tank 2 for storing hot water, a heat insulating material 5 covering the periphery of the hot water storage tank 2 for suppressing heat radiation from the stored hot water, and an outdoor unit (not shown) to heat the hot water. A hot water supply pipe 3 for transferring the boiled hot water to the hot water storage tank 2, a hot water outlet pipe 4 for transferring the hot water stored in the hot water storage tank 2 to a water faucet or a bath (not shown), and these hot water storage tanks. An exterior case 8 is provided to house each component of the unit 1 inside. In FIG. 1 , the exterior case 8 is indicated by a two-dot chain line to illustrate the internal structure of the hot water storage tank unit 1 housed in the exterior case 8 . Also, from FIG. 2 onward, the illustration of the exterior case 8 is appropriately omitted so that the internal structure of the hot water storage tank unit 1 can be understood.

As shown in FIG. 5, the hot water storage tank 2 includes a cylindrical body portion 2a, and a first end portion 2b and a second end portion 2c having a bowl shape connected to the open end of the body portion 2a. have. The first end portion 2b and the second end portion 2c form so-called end plates and are welded to the ends of the trunk portion 2a. The hot water storage tank 2 is used in a posture in which the first end 2b is on the upper side and the second end 2c is on the lower side. A nipple 6a and a nipple 6b leading to the inside of the hot water storage tank 2 are attached to the first end portion 2b.

As shown in FIGS. 1, 2 and 5, the heat insulating material 5 consists of an upper heat insulating material 51 that covers the upper part of the hot water storage tank 2, and a first middle heat insulating material 52 and a second middle heat insulating material that cover the middle part of the hot water storage tank 2. 53 and a lower heat insulating material 54 covering the lower part of the hot water storage tank 2 . The heat insulating material 5 is made of foamed polyurethane, for example. Polyurethane foam is produced by generating carbon dioxide through a curing reaction of a urethane raw material liquid to form a foam, or by vaporizing a foaming agent in a polyol by reaction heat to produce foam. Foaming urethane expands to several tens of times the volume of the original urethane raw material liquid by foaming. The carbon dioxide or vaporized blowing agent produced by such reactions has a lower thermal conductivity than air. Further, the cells inside the foamed polyurethane form independent cells and are not communicating with each other. As a result, the heat insulating material 5 made of foamed polyurethane has high heat insulating performance.

The upper heat insulating material 51 has a bowl-like shape, and the shape of its inner peripheral surface matches the shape of the outer peripheral surface of the upper portion of the hot water storage tank 2 . As shown in FIGS. 4 and 5, the upper heat insulating material 51 is formed with a first opening 51a for exposing the nipple 6a attached to the hot water storage tank 2. As shown in FIGS. Thereby, the exposed nipple 6a and the upper hot water supply pipe 33 can be connected. Further, the upper heat insulating material 51 is formed with a second opening 51b for exposing the nipple 6b attached to the hot water storage tank 2 . Thereby, the exposed nipple 6b and the tapping pipe 4 can be connected.

The lower heat insulating material 54 has a bowl-like shape as shown in FIGS. formed.

The first middle heat insulating material 52 and the second middle heat insulating material 53 cover the body part 2 a of the hot water storage tank 2 between the upper heat insulating material 51 and the lower heat insulating material 54 . The first middle heat insulating material 52 and the second middle heat insulating material 53 each have a portion like a cylindrical heat insulating material covering the circumference of the body portion 2a divided in half along the axial direction. The body portion 2a of the hot water storage tank 2 is covered with a first middle heat insulating material 52 and a second middle heat insulating material 53 which are cylindrically combined with their edges in contact with each other.

As shown in FIGS. 6 and 7, the first central heat insulating material 52 includes a heat insulating material main body 55 as a heat insulating part made of polyurethane foam and a central hot water supply pipe as a pipe part partly embedded in the heat insulating material main body 55. 32 , and a first plate portion 35 and a second plate portion 36 embedded in the heat insulating material body 55 and flush with the surface of the heat insulating material body 55 .

As shown in FIG. 6, the heat insulating material body 55 has a half portion 55a having a shape obtained by dividing a cylinder in half, and a thick portion 55b formed on the outer peripheral surface of the half portion 55a and protruding outward. are doing. The thick portion 55b is formed in a partial range in the circumferential direction of the half portion 55a, and extends in a direction perpendicular to the circumferential direction of the half portion 55a, that is, in the height direction of the hot water storage tank unit 1. there is As shown in FIG. 3, the heat insulator main body 55 is thicker at the portion where the thick portion 55b is formed than at other portions. A portion of the central hot water supply pipe 32 is embedded in the portion where the thick portion 55b is formed.

As shown in FIG. 8A, the central hot water supply pipe 32 includes a straight pipe portion 32a extending in one direction, elbow portions 32b and 32c provided at the ends of the straight pipe portion 32a, and elbow portions 32b and 32c. a female first terminal 32f provided at one end of the central hot water supply pipe 32, and a female second terminal 32g provided at the other end of the central hot water supply pipe 32 and The orthogonal portions 32d and 32e are arranged so as to be orthogonal to the straight tube portion 32a and face the same direction. For this reason, the central hot water supply pipe 32 has the shape of a square bracket, that is, the shape of "[". The central hot water supply pipe 32 is made of stainless steel, for example.

The first terminal part 32f and the second terminal part 32g are parts expanded so that the male terminal part formed in the pipe to be connected can be inserted, and the inner diameter thereof is the outer diameter of the male terminal part. slightly larger than A packing or an O-ring (not shown) is provided between the pipes connected to the first terminal portion 32f and the second terminal portion 32g. In addition, connecting portions of the pipes are fixed by fasteners (not shown) so that the pipes inserted from the first terminal portion 32f and the second terminal portion 32g do not slip out.

A first plate portion 35 is attached to the orthogonal portion 32d located closer to the center of the central hot water supply pipe 32 than the first terminal portion 32f. A second plate portion 36 is attached to the orthogonal portion 32e located closer to the center of the central hot water supply pipe 32 than the second terminal portion 32g. As a result, the first plate portion 35 is provided closer to the center of the central hot water supply pipe 32 than the first terminal portion 32f, and the second plate portion 36 is provided closer to the center of the central hot water supply pipe 32 than the second terminal portion 32g. ing.

The first plate portion 35 is made of stainless steel, for example, and is formed of a rectangular flat plate having an insertion hole 35b formed in the center thereof, as shown in FIG. 8(b). The orthogonal portion 32e of the central hot water supply pipe 32 is fitted into the insertion hole 35b as shown in FIG. 8(a). Thereby, the first plate portion 35 is fixed to the orthogonal portion 32d with one surface 35a facing the first terminal portion 32f. The second plate portion 36 also has the same configuration as the first plate portion 35, and is fixed to the orthogonal portion 32e of the central hot water supply pipe 32 with one surface 36a facing the second terminal portion 32g. It is

As shown in FIGS. 6 and 7, the central hot water supply pipe 32 is oriented in a state in which the straight pipe portion 32a faces the extension direction of the thick wall portion 55b, that is, faces the height direction of the hot water storage tank unit 1 shown in FIG. In this state, part of it is embedded in the heat insulating material body 55 . As shown in FIGS. 6 and 7, the first plate portion 35 and the second plate portion 36 attached to the central hot water supply pipe 32 have one surface 35a, 36a flush with the outer surface of the thick portion 55b. It is embedded in the thick portion 55b in a bent state. On the other hand, the other surface 35c of the first plate portion 35 and the other surface 36c of the second plate portion 36 are in contact with the heat insulator main body 55 as shown in FIG. In this manner, the central hot water supply pipe 32 is buried in the heat insulator main body 55 in the range from the first plate portion 35 to the second plate portion 36 . Specifically, all of the straight tube portion 32a and the elbow portions 32b and 32c, and part of the orthogonal portions 32d and 32e are buried in the heat insulating material main body 55. As shown in FIG. On the other hand, the first terminal portion 32f and the second terminal portion 32g provided at both ends of the central hot water supply pipe 32, and a part of the orthogonal portions 32d and 32e are the first plate portion 35 exposed from the thick portion 55b and the second terminal portion 32g. It protrudes from one surface 35a, 36a of the two-plate portion 36 and is not embedded in the heat insulating material main body 55. - 特許庁

As shown in FIG. 5 , the lower hot water supply pipe 31 is a pipe for transferring hot water heated to a high temperature by an outdoor unit (not shown) toward the hot water storage tank 2 . The lower hot water supply pipe 31 has a male terminal at its end, and is connected to the central hot water supply pipe 32 by connecting the male terminal to a second terminal 32g.

The upper hot water supply pipe 33 connects the middle hot water supply pipe 32 and the hot water storage tank 2 . Male end portions are formed at both ends of the upper hot water supply pipe 33 . A terminal portion formed at one end of the upper hot water supply pipe 33 is connected to the first terminal portion 32f, and a terminal portion formed at the other end is connected to the nipple 6a. As a result, hot water boiled by an outdoor unit (not shown) passes through lower hot water supply pipe 31 , middle hot water supply pipe 32 , and upper hot water supply pipe 33 in this order, and is supplied to the inside of hot water storage tank 2 .

One end of the hot water supply pipe 4 is connected to the hot water storage tank 2 via a nipple 6b, and is a pipe for supplying hot water stored in the hot water storage tank 2 to a tap (not shown) or a bath.

Next, a method for manufacturing the first central heat insulating material 52 in which a part of the central hot water supply pipe 32 is embedded will be described.

First, the central hot water supply pipe 32 to which the first plate portion 35 and the second plate portion 36 shown in FIG. 8(a) are attached is prepared. When attaching the first plate portion 35 to the central hot water supply pipe 32, the hole diameter of the insertion hole 35b of the prepared first plate portion 35 shown in FIG. larger than the outer diameter of However, the difference is set to 0.2 mm or less. After the orthogonal portion 32d is inserted into the insertion hole 35b, force is applied to the orthogonal portion 32d to expand the tube. Thereby, the first plate portion 35 can be fixed to the orthogonal portion 32d. The second plate portion 36 is also attached to the orthogonal portion 32e in the same manner as the first plate portion 35. As shown in FIG. Then, as shown in FIG. 9( a ), the prepared central hot water supply pipe 32 is installed in the first mold 60 .

The first mold 60 forms the outer portion of the first central heat insulating material 52 that does not face the hot water storage tank 2 . A release agent is applied to the first mold 60 to facilitate demolding. The first mold 60 is generally called a lower mold, and is provided therein with a pipe 63 through which a fluid, such as oil, heated by a temperature controller (not shown) flows. The first mold 60 is formed with a concave portion 60a that matches the shape of the heat insulating material main body 55 shown in FIG. 8(a). A first accommodation hole 61 is formed in the recess 60a at a position corresponding to the first terminal portion 32f of the central hot water supply pipe 32 to be installed, and a second accommodation hole 62 is formed at a position corresponding to the second terminal portion 32g. It is The first accommodation hole 61 and the second accommodation hole 62 are round holes. The diameter of the first accommodation hole 61 is large enough to accommodate the first terminal portion 32 f and is smaller than the length of one side of the first plate portion 35 . Similarly, the diameter of the second accommodation hole 62 is large enough to accommodate the second end portion 32g and is smaller than the length of one side of the second plate portion 36 . Also, the depth D of the first receiving hole 61 and the second receiving hole 62 shown in FIG. big. A magnet 65 is embedded around the first housing hole 61 and a magnet 66 is embedded around the second housing hole 62 in the first mold 60 .

When installing the middle part hot water supply pipe 32 in the first mold 60, as shown in FIG. 35a is brought into contact with the periphery of the first accommodation hole 61 to block the first accommodation hole 61. - 特許庁At this time, the first plate portion 35 is attracted by the magnet 65 . Similarly, the second terminal portion 32g is inserted into the second accommodation hole 62, and one surface 36a of the second plate portion 36 is brought into contact with the periphery of the second accommodation hole 62 to close the second accommodation hole 62. As shown in FIG. At this time, the second plate portion 36 is attracted by the magnet 66 . In this manner, the central hot water supply pipe 32 is installed in the first mold 60 .

Next, as shown in FIG. 9B, the urethane raw material liquid 600 is discharged from the discharge portion 71 into the concave portion 60a of the first mold 60 in which the central hot water supply pipe 32 is installed. Before the urethane raw material liquid 600 is discharged, heated oil is passed through the pipe 63 to warm the first mold 60 to a temperature in the range of 40°C to 50°C. Then, a predetermined amount of urethane raw material liquid 600 is discharged from the discharge portion 71 .

When the discharge of the urethane raw material liquid 600 is completed, the discharge part 71 is retracted, and the second mold 70 is placed over the first mold 60 from above as shown in FIG. 10(a). As a result, the recessed portion 60a of the first mold 60 is closed by the second mold 70, and the heat insulating material body 55 shown in FIG. of cavities are formed.

The second mold 70 forms the inner part of the first middle heat insulating material 52 facing the hot water storage tank 2 . A release agent is applied to the second mold 70 to facilitate demolding. Inside the second mold 70, a pipe 64 through which a fluid heated by a temperature controller (not shown), such as oil, flows is provided. Before the second mold 70 is combined with the first mold 60, heated oil is passed through the pipe 64 to warm the second mold 70 to a temperature in the range of 40.degree. C. to 50.degree. By warming the first mold 60 and the second mold 70 in this manner, the fluidity of the discharged urethane raw material liquid 600 can be enhanced.

While the first mold 60 is closed by the second mold 70, the urethane raw material liquid 600 generates carbon dioxide by a curing reaction and foams, or the foaming agent in the polyol vaporizes and foams. As a result, the urethane raw material liquid 600 expands and eventually fills the cavity between the first mold 60 and the second mold 70 as shown in FIG. 10(b). At this time, the first housing hole 61 formed in the first mold 60 is closed by the first plate portion 35 which is attracted toward the first housing hole 61 by the magnet 65 . Therefore, it is possible to prevent the expanded urethane raw material liquid 600 from entering the first receiving hole 61 from between the first mold 60 and the first plate portion 35 . Similarly, the second housing hole 62 formed in the first mold 60 is closed by the second plate portion 36 attracted toward the second housing hole 62 by a magnet 66 . Therefore, it is possible to prevent the expanded urethane raw material liquid 600 from entering the second housing hole 62 from between the first mold 60 and the second plate portion 36 . After the urethane raw material liquid 600 is completely cured, the mold is removed. Thereby, as shown in FIG. 6, the first central heat insulating material 52 in which the range from the first plate portion 35 to the second plate portion 36 in the central hot water supply pipe 32 is buried in the heat insulating material main body 55 can be manufactured. .

Next, a method for assembling the hot water storage tank unit 1 will be described. First, the nipples 6a and 6b are welded to the hot water storage tank 2 shown in FIG. Subsequently, an upper heat insulating material 51 , a first middle heat insulating material 52 , a second middle heat insulating material 53 , and a lower heat insulating material 54 are arranged around the hot water storage tank 2 . Although it is often easy to assemble by arranging the lower heat insulating material 54 first, the order of assembly is not particularly limited. Next, connect various pipes. First, one end of the upper hot water supply pipe 33 is connected to the nipple 6a connected to the hot water storage tank 2, and the other end is connected to the first terminal portion 32f of the central hot water supply pipe 32. As shown in FIG. Next, the lower hot water supply pipe 31 is connected to the second terminal portion 32g of the central hot water supply pipe 32 . Subsequently, the hot water supply pipe 4 is connected to the nipple 6b connected to the hot water storage tank 2. As shown in FIG. Various pipes of the hot water storage tank unit 1 are connected in this way, but the order of connection is not limited to such order and can be set arbitrarily.

In the above description, in the hot water storage tank unit 1, the heat insulating material 5 of the hot water storage tank 2 and the piping 3 are integrally molded. That is, the heat insulating material 5 suppresses heat radiation from two objects, the hot water storage tank 2 and the pipe 3 . However, the use of the manufacturing method described above is not limited to only this form. For example, for the purpose of insulating only the piping, the above manufacturing method can be adopted even when the heat insulating material and the piping are integrally molded.

As described above, according to the piping according to the first embodiment, the range from the first plate portion 35 to the second plate portion 36 is embedded in the heat insulating material main body 55, while the The first terminal portion 32 f and the second terminal portion 32 g protrude from the first plate portion 35 and the second plate portion 36 and are not covered with the heat insulating material main body 55 . Therefore, it can be easily connected to another pipe through the exposed first terminal portion 32f and second terminal portion 32g.

In addition, by making one surface 35a of the first plate portion 35 and one surface 36a of the second plate portion 36 flush with the outer surface of the heat insulating material main body 55, the portion protruding from the first central heat insulating material 52 The handling of the first middle heat insulating material 52 can be facilitated without forming a .

Further, according to the pipe manufacturing method according to the first embodiment, the first housing hole 61 formed in the first mold 60 can be closed by the first plate portion 35 attached to the central hot water supply pipe 32. , the second housing hole 62 formed in the first mold 60 can be closed by the second plate portion 36 attached to the central hot water supply pipe 32 . This can prevent the expanding urethane raw material liquid 600 from entering the first receiving hole 61 and the second receiving hole 62 . In addition, the middle hot water supply pipe 32 is fitted to the first plate portion 35 and the second plate portion 36 by inserting and expanding the middle hot water supply pipe 32 through the first plate portion 35 and the second plate portion 36 . . As a result, the urethane raw material liquid 600 can be prevented from entering the first receiving hole 61 and the second receiving hole 62 through the gaps between the first plate portion 35 and the second plate portion 36 and the central hot water supply pipe 32 . . Therefore, the first terminal portion 32f and the second terminal portion 32g of the central hot water supply pipe 32 that are housed in the first housing hole 61 and the second housing hole 62 can be exposed. A pipe can be manufactured that can be easily connected to another pipe via the second end 32g.

A magnet 65 that attracts the first plate portion 35 closing the first housing hole 61 is embedded around the first housing hole 61 formed in the first mold 60 . Similarly, a magnet 66 that attracts the second plate portion 36 closing the second housing hole 62 is embedded around the second housing hole 62 formed in the first mold 60 . As a result, the central hot water supply pipe 32 installed in the first mold 60 can be temporarily fixed by magnetic force, and a stable posture can be maintained. Also, the first plate portion 35 and the second plate portion 36 can be brought into strong contact with the first mold 60 . Therefore, it is possible to prevent the first plate portion 35 and the second plate portion 36 from floating due to the expansion of the urethane raw material liquid 600, and the urethane raw material liquid 600 flows into the first receiving hole 61 and the second receiving hole 62. can be prevented. As a result, it is possible to manufacture a pipe having the exposed first terminal portion 32f and the exposed second terminal portion 32g. Although the magnets are arranged around the first housing hole 61 and the second housing hole 62 formed in the first mold 60, the magnets may be arranged only around one of the holes.

Further, even if the piping according to the first embodiment is employed as a component of the hot water storage tank unit 1, the same effect as described above can be obtained. Further, even if the method of manufacturing the piping according to the first embodiment is incorporated into the method of manufacturing the hot water storage tank unit 1, the same effect as described above can be obtained.

(Embodiment 2)
Next, Embodiment 2 will be described. A first projection 133 and a second projection 134 are formed on the central hot water supply pipe 132, as shown in FIG. Although this point is different from the first embodiment, other configurations are the same as those of the above embodiment. The first projection 133 is a projection formed on the outer peripheral surface of the orthogonal portion 32 d along the circumferential direction, and is provided at a position that contacts the first plate portion 35 . Similarly, the second projection 134 is a projection formed on the outer peripheral surface of the orthogonal portion 32e along the circumferential direction, and is provided at a position that abuts on the second plate portion 36. As shown in FIG. The first protrusion 133 and the second protrusion 134 are formed by, for example, bulging. The first protrusion 133 and the second protrusion 134 are accommodated in the first accommodation hole 61 and the second accommodation hole 62 shown in FIG. . In FIG. 11, the first protrusion 133 is provided on the first terminal portion 32f side of the first plate portion 35, but may be provided on the elbow portion 32b side. Similarly, the second protrusion 134 may be provided closer to the elbow portion 32c than the second plate portion 36 is.

According to the piping of the second embodiment, when attaching the first plate portion 35 to the central hot water supply pipe 132 , the first plate portion 35 can be positioned by bringing it into contact with the first projection 133 . Similarly, when attaching the second plate portion 36 to the central hot water supply pipe 132 , the second plate portion 36 can be positioned by bringing it into contact with the second projection 134 . This facilitates manufacture of the central hot water supply pipe 132 . Further, since the first projection 133 covers the contact portion between the first plate portion 35 and the central hot water supply pipe 132, even if the urethane raw material liquid 600 were to pass through this contact portion, the urethane raw material would be prevented by the first projection 133. It is possible to prevent the liquid 600 from passing through. As a result, the urethane raw material liquid 600 can be prevented from leaking into the first accommodation hole 61 . Further, the second projection 134 can also cover the contact portion between the second plate portion 36 and the central hot water supply pipe 132 , thereby suppressing the urethane raw material liquid 600 from leaking into the second accommodation hole 62 .

This disclosure is not limited to the above embodiments, and various modifications and applications are possible. In the above-described embodiment, by expanding the central hot water supply pipe 32, the gap between the first plate portion 35 and the second plate portion 36 is eliminated to prevent the urethane raw material liquid 600 from leaking. However, other configurations for preventing leakage of the urethane raw material liquid 600 can be adopted. For example, the insertion hole 35b of the first plate portion 35 may be burred, and the central hot water supply pipe 32 may be brought into contact with the formed flange. As a result, the contact area between the first plate portion 35 and the central hot water supply pipe 32 can be increased, and leakage of the urethane raw material liquid 600 can be suppressed. A similar configuration can be adopted for the second plate portion 36 as well. Further, the gaps may be filled by joining the central hot water supply pipe 32 and the first plate portion 35 and the second plate portion 36 by metal joining such as welding or brazing. Alternatively, the space between the central hot water supply pipe 32 and the first plate portion 35 and the second plate portion 36 may be filled with an adhesive or a sealing material. This method can also be used when the central hot water supply pipe 32 and the first plate portion 35 and the second plate portion 36 are made of resin and metal bonding cannot be used.

In addition, although it has been described that a release agent is applied to the first mold 60 and the second mold 70 to facilitate demolding, it is also possible to facilitate demolding by attaching a release film. can be

In addition, the types of the first terminal portion 32f and the second terminal portion 32g provided in the central hot water supply pipe 32 are not particularly limited, and may be a female terminal portion as described above, or may be a male terminal portion. Alternatively, it can be appropriately adopted from among other known terminal units.

Further, the first central heat insulating material 52 is manufactured by integrally molding the central hot water supply pipe 32 and the heat insulating material main body 55, but for example, when the upper hot water supply pipe 33 and the upper heat insulating material 51 are integrally molded, the above-mentioned can be adopted. When both the upper heat insulating material 51 and the first middle heat insulating material 52 are integrally molded with the pipes, it is difficult to directly connect the upper hot water supply pipe 33 and the middle hot water supply pipe 32 in terms of assembly. In this case, the upper hot water supply pipe 33 and the central hot water supply pipe 32 may be connected via separate pipes.

Further, in the above embodiment, the hot water supply pipe 3 and the heat insulating material 5 are integrally molded, but the hot water supply pipe 4 and the heat insulating material 5 may be integrally molded using the manufacturing method described above. Thereby, heat radiation from the hot water supply pipe 4 can be suppressed.

In addition, it has been described that the heat insulating material 5 is divided into an upper heat insulating material 51, a first middle heat insulating material 52, a second middle heat insulating material 53, and a lower heat insulating material 54, as shown in FIG. However, such a division manner of the heat insulating material 5 is an example, and other division manners may be adopted. For example, the upper heat insulating material 51 and the first middle heat insulating material 52 may be formed as one heat insulating material.

Further, it has been described that the heat insulating material 5 is made of foamed polyurethane. However, the material of the heat insulating material 5 is not particularly limited, and for example, expanded polystyrene may be used. The manufacturing method described in the above embodiment can be used even when the heat insulating material made of foamed polystyrene is integrally formed with the hot water supply pipe 3 .

Specifically, as shown in FIG. 9(b), after installing the central hot water supply pipe 32 in the first mold 60, instead of the urethane raw material liquid 600, polystyrene grains with a diameter of about 1 mm containing a polystyrene foam foaming agent are used. Inject into the first mold 60 . After the injection, high-temperature steam is injected into the first mold 60, and the first mold 60 is covered with a second mold 70 shown in FIG. . Even with such a manufacturing method, the first and second plate portions 35 and 36 that close the first and second accommodation holes 61 and 62 allow the expanded polyethylene grains to flow into the first and second accommodation holes 61 and 62 . 2 can be prevented from entering into the accommodation hole 62.例文帳に追加As a result, the first end portion 32f and the second end portion 32g of the central hot water supply pipe 32 can be exposed, and another pipe can be easily connected.

In addition, the piping manufactured by the above-described manufacturing method can be used for piping in various devices, plants, and buildings, including hot water storage tank units. Further, the central hot water supply pipe 32 shown in FIG. 8(a) is integrally molded with the heat insulating material, and this integrally molded product is fitted into the heat insulating material of the hot water storage tank 2 to integrate the first central heat insulating material as shown in FIG. Material 52 may be formed.

1 hot water storage tank unit 2 hot water storage tank 2a body portion 2b first end 2c second end 3 hot water supply pipe 4 hot water discharge pipe 5 heat insulating material 6a, 6b nipple 8 exterior case 31 lower hot water supply pipe , 32 central hot water supply pipe, 32a straight pipe portion, 32b, 32c elbow portion, 32d, 32e orthogonal portion, 32f first terminal portion, 32g second terminal portion, 33 upper hot water supply pipe, 35 first plate portion, 35a one surface , 35b insertion hole, 35c other surface, 36 second plate portion, 36a one surface, 36b insertion hole, 36c other surface, 51 upper heat insulating material, 51a first opening, 51b second opening, 52 first Middle heat insulating material 53 Second middle heat insulating material 54 Lower heat insulating material 55 Heat insulating material main body 55a Halved portion 55b Thick portion 60 First mold 60a Concave portion 61 First accommodation hole 62 Second accommodation Hole, 63, 64 Piping, 65, 66 Magnet, 70 Second mold, 71 Discharge part, 132 Central hot water supply pipe, 133 First projection, 134 Second projection, 600 Urethane raw material liquid.

Claims (10)

a piping section having a first terminal formed at one end and a second terminal formed at the other end;
a first plate portion having an insertion hole through which the pipe portion is inserted, provided closer to the center of the pipe portion than the first terminal portion, and having one surface facing the first terminal portion;
a second plate portion having an insertion hole through which the pipe portion is inserted, provided closer to the center of the pipe portion than the second terminal portion, and having one surface facing the second terminal portion;
a heat insulating portion that covers a range from the first plate portion to the second plate portion in the piping portion and is in contact with the other surface of the first plate portion and the other surface of the second plate portion;
Piping. The first plate portion and the second plate portion are embedded in the heat insulating portion,
The one surface of the first plate portion and the one surface of the second plate portion are flush with the outer surface of the heat insulating portion,
The pipe according to claim 1. A first projection adjacent to the first plate portion and a second projection adjacent to the second plate portion are formed along the circumferential direction on the outer peripheral surface of the pipe portion,
The piping according to claim 1 or 2. A first terminal portion is formed at one end and a second terminal portion is formed at the other end, and a first plate portion provided closer to the center than the first terminal portion and a plate portion provided closer to the center than the second terminal portion preparing a pipe inserted through the second plate portion;
a step of preparing a mold for molding in which a first housing hole for housing the first terminal portion and a second housing hole for housing the second terminal portion are formed;
The first receiving hole is closed by the first plate portion with the first terminal portion received in the first receiving hole, and the second terminal portion is received with the second terminal portion received in the second receiving hole. A step of installing the pipe in the mold by closing the second housing hole with a plate portion;
A step of introducing a material of a heat insulating material into the mold in which the pipe is installed, and covering the range from the first plate portion to the second plate portion of the pipe with the heat insulating material;
comprising
A method of manufacturing piping. a magnet is provided around at least one of the periphery of the first housing hole and the periphery of the second housing hole of the mold;
In the step of installing the pipe in the mold, the magnet attracts the first plate portion or the second plate portion,
A method for manufacturing a pipe according to claim 4. a hot water tank for storing hot water,
a heat insulating material surrounding the hot water storage tank to suppress heat radiation;
a hot water supply pipe to which a plurality of pipes are connected via terminal portions and for transferring hot water to the hot water storage tank;
Some of the plurality of pipes are
a first terminal formed at one end;
a second terminal formed at the other end;
A first plate having an insertion hole through which the part of the pipe is inserted, is provided closer to the center of the part of the pipe than the first terminal part, and has one surface facing the first terminal part Department and
A second plate having an insertion hole through which the part of the pipe is inserted, is provided closer to the center of the part of the pipe than the second terminal part, and has one surface facing the second terminal part and
A range from the first plate portion to the second plate portion of the part of the pipe is buried in the heat insulating material,
The heat insulating material is in contact with the other surface of the first plate portion and the other surface of the second plate portion,
hot water tank unit. The first plate portion and the second plate portion are embedded in the heat insulating material,
The one surface of the first plate portion and the one surface of the second plate portion are flush with the outer surface of the heat insulating material,
The hot water storage tank unit according to claim 6. A first projection adjacent to the first plate portion and a second projection adjacent to the second plate portion are formed along the circumferential direction on the outer peripheral surface of the part of the pipe,
The hot water storage tank unit according to claim 6 or 7. In the hot water storage tank unit manufacturing method according to any one of claims 6 to 8,
Preparing the part of piping;
a step of preparing a mold for molding the heat insulating material, in which a first receiving hole for receiving the first terminal portion and a second receiving hole for receiving the second terminal portion are formed;
The first receiving hole is closed by the first plate portion with the first terminal portion received in the first receiving hole, and the second terminal portion is received with the second terminal portion received in the second receiving hole. A step of installing the part of the pipe in the mold by closing the second accommodation hole with a plate portion;
A step of inserting the material of the heat insulating material into the mold in which the part of the pipe is installed, and embedding the part of the pipe from the first plate part to the second plate part in the heat insulating material. ,
arranging a heat insulating material in which the part of the pipe is embedded around the hot water storage tank;
A method for manufacturing a hot water storage tank unit. a magnet is provided around at least one of the periphery of the first housing hole and the periphery of the second housing hole of the mold;
In the step of installing the pipe in the mold, the magnet attracts the first plate portion or the second plate portion,
The method for manufacturing the hot water storage tank unit according to claim 9.

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