JP2023110816A - Hot water storage type hot water supply system connection pipes - Google Patents

Abstract

To provide hot water storage type hot water supply system connection pipes that can extend the life of the pipes, and reduce costs.SOLUTION: Hot water storage type hot water supply system connection pipes are pipes connecting a heat source machine 20 and a hot water storage tank 10, and comprise high-temperature side pipes 24, 40a, and 13 for supplying hot water from the heat source machine 20 to the hot water storage tank 10, and low-temperature side pipes 14 and 40b for supplying hot water from the hot water storage tank 10 to the heat source machine 20. The high-temperature side pipes comprise a plurality of pipes connected by joints, and the thickness of at least one of the plurality of pipes is thicker than the thickness of the low-temperature side pipes.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting pipe of a hot water storage type hot water supply system having a hot water storage tank and a heat source.

In a hot water storage type hot water supply system, hot water heated by a heat source machine is stored in a hot water storage tank, and hot water is supplied from the hot water storage tank to a place where hot water is required, such as a bathroom, a kitchen, a floor heating system, etc. (Patent document 1).

A pipe is provided between the hot water storage tank and the heat source device so as to circulate the hot water, and the temperature of the hot water in the hot water storage tank is maintained at a predetermined temperature. A heat pump, a boiler, or the like is used as the heat source.

As the above-described piping, in addition to metal piping, resin piping such as crosslinked polyethylene pipes is also used (Patent Documents 2 and 3).

As a method of manufacturing a bent crosslinked polyethylene pipe, Patent Document 4 describes a method of heating an uncrosslinked pipe, bending the pipe, and then crosslinking the pipe.

As a joint for connecting resin pipes, there is a one-touch joint provided with a female coupler and a male coupler that can be inserted and removed, and a holding member for holding both couplers in an inserted (coupled) state (Patent Document 5 and Patent Document 3). ).

JP 2021-162163 A JP 2010-156361 A JP 2010-144866 A JP 2017-87623 A Japanese Patent No. 4973860

As piping for circulating hot water between a hot water storage tank and a heat source device, resin piping that does not elute metal components is often used. The pipes include a high-temperature side pipe that supplies high-temperature water heated by the heat source machine to the hot water storage tank, and a low-temperature side pipe that supplies low-temperature water whose temperature has been lowered in the hot water storage tank to the heat source machine. In the conventional storage-type hot water supply system, the low temperature side piping and the high temperature side piping used the same resin piping, so there was a problem that the high temperature side piping deteriorated earlier than the low temperature side piping. .

Pipes are sometimes arranged in concealed parts such as inside walls or under floors, and since it is difficult to replace the pipes in such concealed parts, it is desired to extend the service life of the pipes. However, simply increasing the wall thickness of the resin pipe would result in excessive specification of the low-temperature side pipe, resulting in high costs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hot water storage type hot water supply system connection pipe that can extend the life of the pipe and reduce the cost.

A hot water storage type hot water supply system connection pipe according to one aspect of the present invention is a pipe that connects a heat source device and a hot water storage tank of a hot water storage type hot water supply system, the pipe has a plurality of curved resin pipes, Each of the plurality of curved pipes is curved in at least one location, the curved portion and the plurality of straight pipe portions connected to the curved portion are positioned on the same plane, and the curved pipes are positioned on different planes. connected so as to

In the first aspect of the present invention, among the plurality of pipes, the thickness of the pipes closer to the heat source equipment is thicker than the thickness of the pipes farther from the heat source equipment (second aspect).

In the first aspect of the present invention, among the plurality of pipes, the thickness of the pipe arranged in the concealed portion is thicker than the thickness of the pipe arranged outside the concealed portion (third aspect).

In the first to third aspects of the present invention, the high temperature side pipe and the low temperature side pipe are crosslinked polyethylene pipes (fourth aspect).

ADVANTAGE OF THE INVENTION According to this invention, while prolonging the life of piping, cost can be held down.

1 is a schematic diagram of a hot water storage type hot water supply system according to an embodiment; FIG. (a) and (b) are perspective views of a resin pipe. BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows a part of hot water storage type hot water supply system which concerns on embodiment. FIG. 4 is a side view of a male coupler;

Embodiments will be described below with reference to the drawings.

FIG. 1 is a schematic diagram of a storage-type hot water supply system according to an embodiment. This hot water storage type hot water supply system includes a hot water storage tank 10 and a heat source machine (a heat pump device in this embodiment) 20 . The hot water storage tank 10 has a hot water receiving port 11 from the heat source machine 20 and a hot water delivery port 12 to the heat source machine.

One ends of bent pipes 13 and 14 bent into predetermined shapes are connected to the receiving port 11 and the sending port 12, respectively. The curved pipes 13 and 14 are made of resin pipes, preferably crosslinked polyethylene pipes.

At the other ends of the curved pipes 13, 14, female couplers 15, 16 forming one half side of the one-touch joint are provided.

The heat source machine 20 has a hot water receiving port 21 from the hot water storage tank 10 and a hot water delivery port 22 to the hot water storage tank 10 .

One ends of bent pipes 13 and 14 bent into predetermined shapes are connected to the receiving port 21 and the sending port 22, respectively. The bent pipes 23, 24 are made of resin pipes, preferably crosslinked polyethylene pipes.

At the other ends of the curved pipes 23, 24, female couplers 25, 26 forming one half side of the one-touch joint are provided.

The one ends of the bent pipes 13, 14, 23, 24 are connected to the receiving ports 11, 21 or the delivery ports 12, 22 via a joint 30 such as a joint with a union nut.

The bent pipes 13, 14, 23, and 24 are preliminarily bent into a predetermined shape at the factory. As this bending method, the method described in Patent Document 4 is suitable.

The curved pipes 13 and 14 have three curved points, downward from the inlets 11 and 21, then horizontal, then upward, and then horizontal. The curved pipes 23 and 24 also have three curved portions. However, the shapes of the curved pipes 13, 14, 23, 24 are appropriately determined according to the site conditions.

The bent pipes 13 and 24 and the bent pipes 14 and 23 are connected by a resin pipe 40 that is not bent. The resin pipe 40 is preferably made of a crosslinked polyethylene pipe.

The length of the resin pipe 40 is determined according to the distance between the hot water storage tank 10 and the heat source device 20 . When this distance is short, the product is carried into the site in a straight tube shape as shown in FIG. 2(a). When the distance is long, a long straight pipe is carried into the site in a single or double-wrapped packing form as shown in FIG. 2(b).

Male couplers 41 and 42 are attached to both ends of the resin pipe 40, respectively, and constitute the other half of the one-touch joint. The male coupler 41 is inserted into the female coupler 15 or 16, the male coupler 42 is inserted into the female coupler 26 or 25, and the male coupler and the female coupler are engaged with each other with a slip prevention clip (not shown) or the like. Thus, the resin pipe 13 and the curved pipe 24 are connected together, and the resin pipe 14 and the curved pipe 23 are connected together.

When the temperature of the hot water in the hot water storage tank 10 is lowered, the hot water is sent to the heat source machine 20 via the delivery port 12, the curved pipe 14, the resin pipe 40 (40b), the curved pipe 23, and the inlet 21. The hot water heated by the machine 20 is sent to the hot water storage tank 10 through the delivery port 22, the curved pipe 24, the resin pipe 40 (40a) and the curved pipe 13, and the hot water is circulated.

The hot water in the hot water storage tank 10 is supplied to places such as a bathtub where hot water is required. When the water level in the hot water storage tank 10 drops, tap water or the like is supplied through a water supply line (not shown).

When the temperature of the hot water drops due to the introduction of tap water or the like, heating is performed by the heat source device 20 as described above.

In FIG. 1, the bent pipes 13, 14, 23, and 24 are bent at three locations, but may be bent at one, two, or four or more locations. FIG. 3 shows an arrangement example of a curved pipe 50 that is bent at one location. One end of this curved pipe 50 is connected to the inlet 21 or outlet 22 of the heat source device 20 by a connection joint 51 . A female coupler 52 is attached to the other end of the curved pipe 50 . The female coupler 52 has a flange portion 52f.

The connection joint 51 side of the bent pipe 50 extends substantially horizontally rearward along the heat source device 20 from the curved portion 50R. The female coupler 52 side of the bent pipe 50 extends substantially horizontally along the wall W of the building rather than the curved portion 50R.

In the above embodiment, the resin pipe 40 is provided with the male couplers 41 and 42, and the curved pipes 13, 14, 23 and 24 are provided with the female couplers 15, 16, 25 and 26. 40 may be provided with a female coupler and the curved pipes 13, 14, 23, 24 may be provided with a male coupler.

A male coupler may be provided on one end side of the resin pipe 40 and a female coupler may be provided on the other end side, the bent pipes 13 and 14 may be provided with the female couplers, and the bent pipes 23 and 24 may be provided with male couplers. The bent pipes 13 and 14 may be provided with male couplers and the bent pipes 23 and 24 may be provided with female couplers.

Various types of detachable (insertable and detachable) one-touch joints comprising a male coupler and a female coupler can be used. An example of a male coupler is shown in FIG.

The male coupler 60 has an inserting portion 61 on the distal end side thereof into the female coupler, and O-rings 62 and 63 are provided on the outer peripheral surface of the inserting portion 61 .

A first flange 64 , a cylindrical portion 65 , a second flange 66 , a cylindrical portion 67 and a third flange 68 are provided following the insertion portion 61 . A nozzle portion 69 into which the resin pipe 40 or 50 is fitted is formed on the rear end side of the third flange 68 . The outer peripheral surface of the nozzle portion 69 is provided with a bamboo shoot-like stepped portion, which makes it easy to fit the resin pipe 40 or 50 and makes it difficult for the resin pipe 40 or 50 to come off.

A latch piece 70 extends from the second flange 64 toward the tip side. The latch pieces 70 extend parallel to the axis of the insertion portion 61 from two circumferential locations of the second flange 64 . Although the claw portion 70a is provided at the tip of the latch piece 70, it may be provided at three or more locations.

When the insertion portion 61 is inserted into the female coupler 52, the tip end of the latch piece 70 climbs over the flange portion 52f of the female coupler 52, and the claw portion 70a engages the outer peripheral edge of the flange portion 52f. As a result, the male coupler 60 and the female coupler 52 are held in an unremovable state.

When the male coupler 60 is removed from the female coupler 52, the latch piece 70a is deformed so as to be raised, the claw portion 70a is separated from the flange portion 52f, and the male coupler 60 is extracted from the female coupler 52.

A one-touch joint other than the above can be used as the one-touch joint. For example, a clip fitting shown in FIG. 4 of Patent Document 3 may be used.

As described above, the heat source machine 20 sends out heated hot water. Therefore, in the present embodiment, the wall thickness of the high-temperature side pipes (curved pipe 24, resin pipe 40a, and curved pipe) through which high-temperature hot water flows is set to 40b and the curved pipe 23) (hereinafter also referred to as "normal thickness"). As a result, the circumferential stress applied to the bent pipe 24, the resin pipe 40a, and the bent pipe 13 is reduced, and the service life can be extended.

In addition, the curved pipe 14 through which the hot water of low temperature flows, the resin pipe 40b, and the curved pipe 23 are not thickened but have normal thickness, thereby reducing the cost.

The bent pipe 14, the resin pipe 40b, and the bent pipe 23 preferably have a wall thickness (normal wall thickness) of 10 mm or less and an outer diameter of 35 mm or less. The thicknesses of the bent pipe 24, the resin pipe 40a, and the bent pipe 13 are preferably 1.2 times or more the normal thickness.

As described above, when pipes are connected with one-touch joints, it is easy to replace deteriorated pipes, but the replacement work becomes difficult depending on the installation location. For example, the resin pipe 40 may be arranged in a concealed portion such as inside a wall, under a floor, or inside a ceiling. Therefore, among the bent pipe 24 through which hot water flows, the resin pipe 40a and the bent pipe 13, only the resin pipe 40a arranged in the concealed portion where the replacement work is difficult is made thicker than the normal thickness to extend the service life. In addition, the bent pipe 24 and the bent pipe 13, which are arranged at a place where the replacement work is easy, may have a normal thickness.

Of the curved pipe 24, the resin pipe 40a, and the curved pipe 13, the hot water flowing through the curved pipe 24 near the heat source device 20 has the highest temperature. In addition, the bent pipe 24 is more likely to deteriorate than the resin pipe 40 a and the bent pipe 13 due to the absorption of metal components eluted from metal pipes such as copper pipes in the heat source device 20 . Therefore, only the bent pipe 24 may be thicker than the normal thickness, and the resin pipe 40a and the bent pipe 13 may be normal thickness. Alternatively, the thickness T1 of the resin pipe 40a and the curved pipe 13 is made thicker than the normal thickness T0, and the thickness T2 of the curved pipe 24 is made thicker than the thickness T1 of the resin pipe 40a and the curved pipe 13. (T2>T1>T0).

Of the bent pipe 24, the resin pipe 40a, and the bent pipe 13, the bent pipe 24 closest to the heat source device 20 and the resin pipe 40a, which is arranged in the concealed portion and difficult to replace, are made thicker than the normal thickness. The curved pipe 13, which is far from the heat source equipment 20 and is easy to replace, may have a normal thickness.

The above-described embodiment is an example of the present invention, and the present invention may be in a form other than the above. For example, the heat source machine may be a boiler. Moreover, the connection between the curved pipe and the receiving port or the delivery port may be of an insertion type as in Patent Document 3 or the like. A heat insulating material may be attached to the resin pipe or the joint.

The resin pipe 40 that is not bent may be omitted, and the hot water storage tank 10 and the heat source device 20 may be connected only by a plurality of bent pipes. Alternatively, the hot water storage tank 10 and the heat source device 20 may be connected only by a resin pipe that is not bent.

10 hot water storage tank 20 heat source machine 11, 21 reception port 12, 22 delivery port 15, 16, 25, 26 female coupler 30 connection joint 40, 50 resin pipe 41, 42 male coupler 60 male coupler 61 insertion part 62, 63 O-ring 70 Latch piece 70a Claw portion

Claims (4)

Piping connecting a heat source machine and a hot water tank of a hot water storage type hot water supply system, comprising a high temperature side pipe for supplying hot water from the heat source machine to the hot water tank, and supplying hot water from the hot water tank to the heat source machine Equipped with low temperature side piping,
The high-temperature side piping has a plurality of piping connected by joints, and at least one of the plurality of piping is thicker than the low-temperature side piping. 2. The hot water storage type hot water supply system connection pipe according to claim 1, wherein, among the plurality of pipes, the thickness of the pipe closer to the heat source device is thicker than the thickness of the pipe farther from the heat source device. 2. The hot-water storage type hot-water supply system connection pipe according to claim 1, wherein, among the plurality of pipes, the thickness of the pipe arranged in the concealed portion is thicker than the thickness of the pipe arranged outside the concealed portion. 4. The piping for connecting hot water storage type hot water supply system according to claim 1, wherein said high temperature side piping and said low temperature side piping are crosslinked polyethylene pipes.

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