JP6653508B2 - Residential water supply system - Google Patents

Description

The present invention relates to a water supply system for a house mainly in a cold region.

Conventionally, as this type of water supply system, a water supply system in which a circulation pipeline is formed between a water supply main pipe and a water tap is known (see Patent Document 1). The water supply system includes a water supply header connected to the water supply main pipe, a water return header connected to the water supply main pipe via the water return main pipe, a first water supply pipe connecting the water supply header to the first water tap. A second water supply pipe connecting the water supply header to the second water tap, a first water return pipe connecting the water return header to the first water tap, a water return header and the second water tap. And a second return pipe for connecting The water supply system further includes a temperature sensor disposed in the first water supply pipe near the first water tap, and an opening / closing control unit that opens and closes the first water tap based on a detection result of the temperature sensor. Is provided.
In this water supply system, when the temperature sensor detects a temperature (set temperature) at which the first water pipe (water) is likely to freeze, the opening / closing control means opens the first water tap. As a result, water is discharged from the first water tap, and water is supplied from the main water supply pipe to the first water tap via the two conduits, thereby preventing the first water tap from freezing. In addition, the supply of the water causes a flow of the water in the entire pipeline, thereby preventing the second water tap from freezing.

JP-A-2002-54192

In such a conventional water supply system, it is considered that a minute flow of water occurs in the second water supply pipe and the second water return pipe in preventing the second water tap from freezing. That is, it is conceivable that the opening of the first water tap causes a pressure difference between the pressure in the water supply header and the pressure in the water return header. This pressure difference is caused by a pressure based on pipe friction loss between a pipe from the T-shaped joint to the water supply header (water supply main pipe) and a pipe from the T-shaped joint to the water return header (water return main pipe). It is thought to be caused by the difference in loss.
Therefore, in the conventional water supply system, in order to prevent the second water tap from freezing, it is necessary to flow a large amount of water to such an extent that the first water tap is fully opened. There is a problem of wasting a lot. Further, when the second water supply pipe and the second water return pipe are long, or when there are other water taps such as the third and fourth water taps, the pressure loss in the water supply pipe and the water return pipe becomes large, and minute water There is a problem that the flow of can not be expected.

An object of the present invention is to provide a water supply system for a house that suppresses waste of water (tap water) and enables stable freezing prevention.

A water supply system for a house according to the present invention is a water supply system for a house that aims to prevent freezing around a water supply terminal by flowing water in a cold region, and includes a water supply circulation flow path and a water supply circulation path connected to the water supply circulation flow path. A water source, a plurality of water supply terminals connected to the water supply circulation flow path, and a circulating means for circulating water in the water supply circulation flow path, and the water supply circulation flow path has a water supply source side upstream and each water supply terminal The water supply outgoing flow path with the downstream side, and the water supply return flow path with each water supply terminal side as the upstream side and the water supply source side as the downstream side, have a double pipe configured inside, the double pipe is An inner pipe that internally constitutes one of the water supply outflow path and the water supply return flow path, and an outer pipe that constitutes the other of the water supply outflow path and the water supply return flow path in the gap between the inner pipe, Characterized by comprising:

According to this configuration, when water is used in the water supply terminal, the water is supplied from the water supply source side to the water supply terminal via the water supply circulation channel. On the other hand, when the circulation means is driven, the water in the water supply circulation channel circulates. That is, the water is circulated between the water supply source and the water supply terminal by driving the circulation means. In this case, even in the vicinity of the water supply terminal, a flow of water occurs in the water supply circulation channel, and the flow causes a slight flow of water in the water supply terminal. Therefore, it is possible to prevent freezing around the water supply terminal in a cold region or the like. Therefore, waste of water (tap water) can be suppressed and stable freezing prevention can be achieved.
The “water supply terminal” means a sanitary appliance such as a faucet or a stopcock in a water place such as a kitchen, a bathroom, a lavatory, and a toilet.
Further, since the water supply outflow channel and the water supply return flow channel can be constituted by a double pipe, the construction is easy and the space for the piping space can be reduced. In addition, it is possible to save heat insulating materials, support fittings, and the like.
In addition, it is preferable that the double pipe is formed of a resin pipe in consideration of heat retention.

  In this case, it is preferable that the water supply outflow channel is formed inside the inner pipe, and the water supply return flow path is formed in a gap between the inner pipe and the outer pipe.

  According to this configuration, by determining the inner pipe in consideration of the simultaneous use of a plurality of water supply terminals, it is possible to appropriately supply water to the water supply terminals. On the other hand, since water only needs to flow in the water supply return flow path, the outer pipe may have a pipe diameter that can be physically inserted into the inner pipe. Therefore, in the nominal diameter, it is preferable to make the outer pipe two sizes larger than the inner pipe.

  Further, the water supply circulation passage has a terminal joint interposed between the double pipe and the water supply terminal, and the terminal joint has a forward port connected to the water supply outflow path and a forward port connected to the forward path. And a return port connected to the water supply return flow path, and a terminal port connected to the water supply terminal, the forward destination port, the return port and the terminal port are mutually connected. Preferably, they are in communication.

  According to this configuration, when water flows from the water supply terminal (for example, when the faucet is opened), the water in the water supply circulation channel flows from the forward destination port (and the return port) to the terminal side port. On the other hand, when the water supply terminal is not used (for example, when the faucet is closed), the water at the forward destination port flows to the return source port and circulates in the water supply circulation channel. Thereby, a water supply circulation channel can be configured to a position near the water supply terminal.

  Further, on the water supply source side, the water supply circulation path includes a water supply source side outgoing pipe constituting a water supply outflow path, a water supply source side return pipe forming a water supply return flow path, a water supply source side outgoing pipe and a water supply side return pipe. A double pipe joint provided between the pipe and the double pipe, the double pipe joint being connected to a water supply outflow channel on the double pipe side, The return port is coaxial with the port and is connected to the return pipe of the water supply on the double pipe side, the forward port of the water supply source connected to the forward pipe of the water supply source, and the return pipe of the water supply source. And a water supply source-side return port to be connected, wherein the forward port is preferably connected to the water source-side forward port, and the return port is preferably connected to the water supply source-side return port.

  According to this configuration, by using the double pipe base joint, the double pipe can be easily connected to the water supply source-side outgoing pipe and the water supply source-side return pipe on the water supply source side. Therefore, the construction can be easily performed even in a repair work in which an existing water supply pipe is replaced with a double pipe.

On the other hand, the water supply source has a water supply storage unit that stores water from the outside so as to be replenishable, and a water supply / water supply unit that supplies water in the water supply storage unit to a plurality of water supply terminals via a water supply circulation channel. It is preferable that the water supply storage section and the water supply / water supply section are provided in the water supply circulation path, and the water supply / water supply section also serves as a circulation means.

  According to this configuration, the water supply / water supply unit as a water supply unit to the water supply terminal can be used as a circulation unit that circulates the water in the water supply circulation channel. Therefore, by making the water supply pipe a double pipe, a basic freezing prevention function can be added, and increases in initial cost and running cost can be sufficiently suppressed.

  In this case, the suction port side of the water supply / water supply unit is connected to the water supply storage unit, the upstream end of the water supply source-side outgoing pipe is connected to the discharge port side of the water supply / water supply unit, and the downstream end of the water supply source-side return pipe is Preferably, it is connected to the water supply storage.

  According to this configuration, in the water supply circulation channel, the water sent from the water supply / water supply unit is returned to the water supply storage unit. Therefore, freezing can be prevented without wastefully discarding water and without generating dead water in the water supply circulation channel.

Further, the water supply source has a direct water supply unit for supplying water from the outside to the plurality of water supply terminals via the water circulation circuit, and the direct water supply unit is provided in the water circulation circuit. It is preferable that the directly connected water supply unit also serves as a circulation unit.

  According to this configuration, it is possible to utilize the directly connected water supply unit as a water supply unit to the water supply terminal as a circulation unit that circulates water in the water supply circulation channel. Therefore, by making the water supply pipe a double pipe, a basic freezing prevention function can be added, and increases in initial cost and running cost can be sufficiently suppressed.

  In this case, the upstream end of the water supply source-side outgoing pipe is connected to the discharge port side of the direct water supply / water supply section, and the downstream end of the water supply source-side return pipe is connected to the suction port side of the direct water supply / water supply section. preferable.

  According to this configuration, in the water supply circulation channel, the water sent from the water supply / water supply unit is returned to the water supply / water supply unit again. Therefore, freezing can be prevented without wastefully discarding water and without generating dead water in the water supply circulation channel.

It is a piping system diagram of the water supply system which concerns on 1st Embodiment which applied this invention to the detached house. FIG. 2 is a piping system diagram schematically illustrating the water supply system according to the first embodiment. Schematic diagram of a double pipe branch joint of the embodiment (a), schematic diagram of a double pipe end joint (b), schematic diagram of a double pipe T-shaped joint (c), schematic diagram of a double pipe L-shaped joint (D). It is a piping system diagram of a water supply system concerning a 2nd embodiment.

Hereinafter, a water supply system for a house according to an embodiment of the present invention will be described with reference to the accompanying drawings. The water supply system (water supply) is Oite the houses in cold regions, and takes into account the antifreeze, will now be described the case of providing the water supply system in detached houses.

[First Embodiment]
FIG. 1 shows a water supply system in which city water distributed from a water supply company is once received by a water receiving tank and supplied to dwelling units. FIG. 2 schematically shows this water supply system. As shown in both figures, the water supply system 10 is a so-called water receiving tank pressurized water supply system, in which a water receiving tank 13 (reservoir) and a water supply pump 14 (water supply / water supplying unit) constituting a water supply source 11 are unitized. The pump unit includes a pump unit 12 having a body shape, and a water supply pipe 15 of a front branch type which is piped from the pump unit 12 into a dwelling unit.

  The pump unit 12 is formed by unitizing a small water receiving tank 13 made of resin and a water supply pump 14 (so-called “inverter pump”) controlled by an inverter, and a water intake pipe 17 is connected to the water receiving tank 13. A water supply pipe 15 is connected to the water supply pump 14. The intake pipe 17 branches from a city water distribution pipe 18 and is connected to the water receiving tank 13 via a water meter 19. In addition, the water supply source 11 does not necessarily need to be the pump unit 12 integrated with the water receiving tank, and may be of a type in which the water receiving tank 13 and the water supply pump 14 are separately installed.

  The water supply pipe 15 of the front branch type is provided with a water supply main pipe 22 roughly piped from the water supply pump 14 to each water supply terminal 21 such as a bathroom, and a water supply main pipe 22 branched from the water supply main pipe 22 and piped to each water supply terminal 21. And a plurality of water supply branch pipes 23. The water (tap water) once stored in the water receiving tank 13 is supplied to the water supply terminal 21 via the water supply pipe 15 by the water supply pump 14 driven by use of the water supply terminal 21 (flowing water sensing).

  The water supply terminal 21 in the present embodiment includes a kitchen, a toilet, a bathroom washroom, a bathtub, a vanity and a washing machine on the first floor, and a toilet and a vanity on the second floor. In the strict sense, the water supply terminal 21 is provided with a stopcock (not shown) provided in front of a faucet in a kitchen, a vanity stand and a washing machine, and a stopcock provided in front of a low tank in a toilet. A faucet (not shown) corresponds to this. In the bathroom, since there is no water stopcock, a connecting pipe of a water tap (mixing tap) in a washing place or a bathtub corresponds to the water supply terminal 21.

  The water supply pipe 15 is mainly composed of a double pipe 30 having a water supply outflow path 32 and a water supply return path 33. The water supply outgoing flow path 32 and the water supply return flow path 33 constitute a water supply circulation flow path 31 including the pump unit 12 (the water receiving tank 13 and the water supply pump 14), and circulate water using the water supply pump 14 as a power source. ing. That is, the water supply pump 14 has both the original function of supplying water to the water supply terminal 21 and the function of a circulation pump that circulates water in the water supply circulation channel 31. In the water supply outflow channel 32 as the water supply circulation channel 31, water flows with the pump unit 12 side as the upstream side and each water supply terminal 21 side as the downstream side, and in the water supply return channel 33, the water supply terminal 21 side as the upstream side. Water flows with the pump unit 12 side as the downstream side.

  That is, when the water supply pump 14 is driven, the water drawn from the water receiving tank 13 reaches each water supply terminal 21 (actually, a double pipe terminal joint 42 described later) through the water supply outflow channel 32. Further, the water that has reached each water supply terminal 21 makes a U-turn here and flows into the water receiving tank 13 through the water supply return flow path 33. By extending the water supply circulation channel 31 to the vicinity of the water supply terminal 21 so that water always flows through the water supply pipe 15, freezing around the water supply terminal 21 is prevented. On the other hand, when water is used at the water supply terminal 21, the water mainly flows from the water supply outflow channel 32 toward the water supply terminal 21.

  On the discharge side of the water supply pump 14, a water supply source side outgoing pipe 35 constituting the upstream part of the water supply outflow channel 32 is connected, and in the water receiving tank 13, the water supply source side constituting the downstream part of the water supply return flow path 33. A return pipe 36 is connected. Needless to say, the suction side of the water supply pump 14 is connected to the water receiving tank 13 in the pump unit 12.

  By the way, the circulation flow rate of water in the water supply circulation channel 31 for the purpose of preventing freezing may be a little smaller than the supply flow rate of water to the water supply terminal 21 (use of water). For this reason, the water supply source side return pipe 36 connected to the water receiving tank 13 is provided with an orifice 37 (flow rate restricting means) for restricting the flow rate so that the water supply pump 14 is controlled at the minimum number of revolutions (inverter control). Has been established. That is, water is discharged from the water supply source side return pipe 36 to the water receiving tank 13 so that the water supply pump 14 does not automatically stop. However, by squeezing the flow rate with the orifice 37, the water can be circulated with minimum power consumption. Can be. In addition, the water supply pump 14 incorporates an overpressure stop mechanism 38 (for example, a water amount sensor) in order to prevent seizing of the pump motor. Therefore, when selecting the orifice 37, it is preferable to reduce the flow rate of the water supply source side return pipe 36 as long as the overpressure stop mechanism 38 does not operate.

  The water supply source-side outgoing pipe 35 and the water supply source-side return pipe 36, and the double pipe 30 (the main water supply pipe 22) that forms the main part of the water supply pipe 15 are connected via a double pipe branch joint 41 (double pipe main joint). Connected. Further, the water supply pipe 15 (water supply branch pipe 23) constituted by the double pipe 30 and each water supply terminal 21 are connected via a double pipe terminal joint 42 (terminal joint). A double pipe T-shaped joint 43 is provided at each branch of the water supply pipe 15, and a double pipe L-shaped joint 44 is provided at each bent part of the water supply pipe 15.

  The double pipe 30 as a straight pipe includes an inner pipe 46 having a water supply outflow channel 32 formed therein, and an outer pipe 47 having a water supply return flow path 33 formed in a gap between the inner pipe 46 and the inner pipe 46. The outer tube 47 and the outer tube 47 are both formed of a resin tube such as a polybutene tube. In this case, in order to secure an appropriate flow passage area as the water supply return flow path 33 between the inner pipe 46 and the outer pipe 47, in the double pipe 30 of the embodiment, the outer pipe 47 is The two sizes up are used. In the present embodiment, the inner pipe 46 is set to 20 mm (nominal diameter) in consideration of the fact that the water supply target is a house and that there are relatively many sanitary appliances. The outer tube 47 is 30 mm (nominal diameter), which is two sizes larger than the inner tube 46. Although not shown in the drawing, the water supply pipe 15 is coated with a heat insulating material in consideration of dew condensation prevention and freeze prevention.

Next, the various types of double pipe joints will be briefly described with reference to FIG.
FIG. 3A is a schematic view of the double pipe branch joint 41. As shown in the figure, the double pipe base branch joint 41 has a basic form of cheese, and has a forward path source port 51 connected to the inner pipe 46 (the water supply outflow path 32) of the double pipe 30. The return port 52 is disposed coaxially with the forward path source port 51 and connected to the outer pipe 47 (the feed water return flow path 33) of the double pipe 30, and the water supply is connected to the water supply source side forward pipe 35. A water source side outgoing port 53 and a water supply source side return port 54 connected to the water source side return pipe 36 are provided.

  The forward port 51 communicates coaxially with the water source side forward port 53, and the return port 52 communicates with the water source return port 54 on the orthogonal axis. When the water supply pump 14 is driven, the water flowing from the water supply source-side outgoing pipe 35 flows through the water supply source-side outgoing port 53 and the outward path starting port 51, and flows into the inner pipe 46 of the double pipe 30. On the other hand, the water flowing from the outer pipe 47 of the double pipe 30 flows through the return path port 52 and the water supply source side return port 54, and flows into the water supply source side return pipe 36. Thereby, the water supply source-side outgoing pipe 35 and the water supply-source-side return pipe 36, which are single pipes, and the inner pipe 46 and the outer pipe 47 of the double pipe 30 are properly connected to each other.

  FIG. 3B is a schematic view of the double pipe terminal joint 42. As shown in the figure, the double pipe end joint 42 has a basic form of an adapter, and has a forward path destination port 56 connected to the inner pipe 46 (the water supply outflow channel 32) of the double pipe 30; A return source port 57 that is disposed coaxially with the forward path destination port 56 and is connected to the outer pipe 47 (the water supply return flow path 33) of the double pipe 30 and is connected to the water supply terminal 21 (such as a connection pipe). And a terminal-side port 58.

  The forward port 56 and the terminal port 58 communicate coaxially, and the forward port 56 and the return port 57 communicate with each other via a communication port 59 formed at the base of the forward port 56. I have. That is, the forward path destination port 56, the return path port 57, and the terminal-side port 58 communicate with each other. The water flowing through the inner pipe 46 of the double pipe 30 flows from the forward port 56 to the return port 57 via the communication port 59, and flows into the outer pipe 47 of the double pipe 30. Thereby, the water supply circulation channel 31 extends to the vicinity of the water supply terminal 21, and water is circulated. On the other hand, when the water supply terminal 21 is used (the faucet is opened), water in the inner pipe 46 of the double pipe 30 flows into the water supply terminal 21 from the outward port 56 through the terminal side port 58.

  FIG. 3C is a schematic view of the double pipe T-joint 43. As shown in the figure, the double tube T-shaped joint 43 has a basic form of cheese, and has three T-shaped outer tubes 47 so that the outer tube 47 of the double tube 30 is connected from three sides. A pipe connection port 61 and three inner pipe connection ports 62 disposed inside each outer pipe connection port 61 and forming a T shape so that the inner pipe 46 of the double pipe 30 is connected from three sides. Have. For example, the double pipe 30 constituting the water supply main pipe 22 is connected to the two outer pipe connection ports 61 and the inner pipe connection port 62 located on the same axis, while one outer pipe connection located on the orthogonal axis is connected thereto. The double pipe 30 constituting the water supply branch pipe 23 is connected to the port 61 and the inner pipe connection port 62. Thereby, each branch portion of the water supply pipe 15 having the double structure is configured.

  FIG. 3D is a schematic view of the double pipe L-shaped joint 44. As shown in the figure, the double tube L-shaped joint 44 has a basic form of an elbow, and forms an L shape so that the outer tube 47 of the double tube 30 is connected from two orthogonal directions. Two outer pipe ports 64 and two inner pipe ports 65 disposed inside each outer pipe port 64 and forming an L shape so that the inner pipes 46 of the double pipe 30 are connected from two orthogonal directions. And The double pipe 30 is connected to one of the outer pipe ports 64 and the inner pipe port 65, and the double pipe 30 is also connected to the other outer pipe port 64 and the inner pipe port 65 orthogonal to the outer pipe port 64 and the inner pipe port 65. Thus, each bent portion of the water supply pipe 15 having the double structure is configured.

  Next, an operation method of the water supply system 10 mainly including the water supply pump 14 will be briefly described with reference to FIG. The feedwater pump 14 operated by the rotation speed control by the inverter is controlled in rotation speed so that the flowing water pressure on the discharge side is constant, for example. For this reason, in operation (automatic operation) when the water supply terminal 21 is used, water is supplied at a predetermined pressure and at a flow rate (rotational speed) corresponding to simultaneous use of the water supply terminal 21. On the other hand, in the operation when the water supply terminal 21 is not used (automatic operation), the discharge flow rate to the water receiving tank 13 is narrowed down through the orifice 37, and therefore, at a predetermined pressure and at the minimum flow rate (rotation speed). Water supply, that is, water circulation is performed. Therefore, although the water supply pump 14 operates for 24 hours, the power consumption for circulation becomes extremely small.

  The water circulation in the water supply circulation channel 31 (water supply pipe 15) is mainly intended to prevent freezing around the water supply terminal 21 in winter. For this reason, for example, the water may be circulated only when the outside air temperature falls below a predetermined temperature. Specifically, when the outside air temperature sensor detects a temperature lower than a predetermined temperature, the control unit opens an electromagnetic valve provided in the water supply source side return pipe 36 to drive the water supply pump 14 (automatically). Operation). Thereby, further power saving can be achieved.

  However, in this case, “dead water” may be generated in the water supply circulation channel 31 (mainly, the water supply return channel 33). Therefore, even when the water supply pump 14 is driven by using the water supply terminal 21, the control unit opens the above-described electromagnetic valve, and circulates the water in the water supply circulation channel 31 in accordance with the use of the water supply terminal 21. Is preferably promoted.

  As described above, according to the water supply system 10 of the first embodiment, when the water supply terminal 21 is used, the water supply pump 14 is driven, and the water is supplied to the water supply terminal 21 via the water supply pipe 15 (the water supply circulation channel 31). Supplied. Further, even when the water supply terminal 21 is not used, a small amount of water is discharged to the water receiving tank 13 through the orifice 37, so that the water supply pump 14 is driven at a low speed and the water in the water supply circulation channel 31 circulates. . That is, in the water supply system 10, as long as the power of the water supply pump 14 is ON, the water in the water supply circulation channel 31 constantly circulates.

  This has the significance of preventing freezing in the water supply system 10 of a house in a cold region in winter. That is, when water circulates between the water supply source 11 and each of the water supply terminals 21, a flow of water occurs in the water supply circulation channel 31 even near the water supply terminal 21, and this flow also causes a slight amount of water in the water supply terminal 21. Flows to The flowing water is hard to freeze, and can prevent freezing around the water supply terminal 21 in a cold region or the like. Therefore, waste of water (tap water) can be suppressed and stable freezing prevention can be achieved.

  Further, since the water supply pipe 15 constituting the water supply circulation flow path 31 is constituted by the double pipe 30 having the water supply outgoing flow path 32 and the water supply return flow path 33, the construction is easy and the space for the piping space can be reduced. Can be planned. In addition, it is possible to save heat insulating materials, support fittings, and the like. Therefore, initial costs can be suppressed.

[Second embodiment]
Next, a water supply system 10A according to a second embodiment will be described with reference to FIG. The water supply system 10A is of a so-called pump direct connection type (directly connected pressure-increased water supply system), and the configuration around a water supply source 11A is different from that of the first embodiment. Therefore, the following mainly describes parts different from the first embodiment.

  In this embodiment, a direct feed water pump 70 (direct feed water supply section) is provided in place of the above pump unit 12 so as to be directly connected to the inlet pipe 17. Also in this case, the direct feed water pump 70 is operated by controlling the rotation speed by an inverter. A suction pipe 17 extending from a water distribution pipe 18 is directly connected to a suction port of the direct water supply pump 70. The downstream end of the water supply source side return pipe 36 is connected to the drawing pipe 17 in the vicinity of the directly connected water supply pump 70. That is, the water supply circulation channel 31 in this case is configured to include the direct water supply pump 70.

  On the other hand, in the operation of the direct water supply pump 70 for circulating water, a bath tub for discharging water into the bath tub is provided in the washing tap 21a (water supply terminal 21) of the bathroom so that the direct water supply pump 70 does not automatically stop. A discharge pipe 75 is provided. A spare outlet 76 is provided in the washing mixer tap 21a. The bathtub discharge pipe 75 has an upstream end connected to the outlet 76 and a downstream end opened to the bathtub. An orifice 37 (flow rate restricting means) is interposed in the bathtub discharge pipe 75, similarly to the water supply source side return pipe 36 of the first embodiment.

  Accordingly, the direct feed water pump 70 is controlled at a minimum flow rate (rotational speed) within a range where the overpressure stop mechanism 38 does not operate when circulating water. Therefore, water can be circulated with minimum power consumption. The faucet provided with the bathtub discharge pipe 75 may be a mixing faucet of a bathtub.

  As described above, according to the water supply system 10A of the second embodiment, the water circulates between the water supply source 11 and each of the water supply terminals 21 as in the first embodiment, even if the pump is directly connected to the system. Even in the vicinity of the water supply terminal 21, a flow of water is generated in the water supply circulation channel 31, so that freezing around the water supply terminal 21 can be prevented. Therefore, waste of water (tap water) can be suppressed and stable freezing prevention can be achieved.

  Further, since the water supply pipe 15 constituting the water supply circulation flow path 31 is constituted by the double pipe 30, the construction is easy and the space for the pipe space can be reduced. In addition, it is possible to save heat insulating materials, support fittings, and the like. Therefore, initial costs can be suppressed.

  In addition, in the water supply systems 10 and 10A of these embodiments, the water supply pipe 15 is configured by the double pipe 30, but may be configured by a single pipe. That is, the water supply pipe 15 may be composed of two pipes, i.e., a water supply outgoing pipe and a water supply return pipe (see FIG. 2), which are similar to those of the hot water reverse return method.

Further, in the above water supply systems 10 and 10A, the water in the water supply circulation channel 31 is discharged to the water receiving tank 13 and the bath tub, so that the water supply pump 14 and the directly connected water supply pump 70 are also used as circulation means. The water in the circulation channel 31 may be discharged to a groundwater flow or the like (in this case, the water is discarded).
Further, a water supply circulation channel 31 is formed in the water supply pipe 15 (the water receiving tank 13 and the water supply pump 14 (directly connected water supply pump 70) are not included in the water supply circulation channel 31). May be provided.

  10, 10A ... water supply system, 11, 11A ... water supply source, 12 ... pump unit, 13 ... water receiving tank, 14 ... water supply pump, 15 ... water supply pipe, 21 ... water supply terminal, 21a ... washing place mixer tap, 22 ... water supply main pipe, 23: Water supply branch pipe, 30: Double pipe, 31: Water supply circulation path, 32: Water supply outflow path, 33: Water supply return path, 35: Water supply source side forward pipe, 36: Water supply source side return pipe, 37 ... orifice, 38 ... overpressure stop mechanism, 41 ... double pipe branch joint, 42 ... double pipe end joint, 43 ... double pipe T-shaped joint, 44 ... double pipe L-shaped joint, 46 ... inner pipe, 47: outer tube, 51: forward port, 52: return port, 53: water supply side forward port, 54: water supply side return port, 56: forward port, 57: return port, 58: terminal Side port, 59: communication port, 70: direct feed water pump, 75: bathtub discharge pipe, 76: outlet

Claims (8)

A water supply system for a house that aims to prevent freezing around a water supply terminal by flowing water in a cold region,
A water supply circulation channel,
A water supply source connected to the water supply circulation flow path,
A plurality of water supply terminals connected to the water supply circulation channel,
Circulating means for circulating water in the water supply circulation flow path,
The feedwater circulation channel,
The water supply source side is the upstream side and the water supply outgoing flow path has the respective water supply terminal side as the downstream side, and the water supply return flow path has the respective water supply terminal side as the upstream side and the water supply side is the downstream side. With a double tube configured in
The double pipe,
An inner pipe that constitutes one of the feedwater flow path and the feedwater return flow path, and an outer pipe that constitutes the other of the feedwater flowpath and the feedwater return flowpath in a gap between the inner pipe and the inner pipe. , Comprising a water supply system for a house . The water supply outflow channel is configured inside the inner pipe,
The house water supply system according to claim 1, wherein the water supply return flow path is formed in a gap between the inner pipe and the outer pipe. The water supply circulation channel has a terminal joint interposed between the double pipe and each of the water supply terminals,
The terminal joint,
An outward destination port connected to the water supply outward flow path,
A return source port disposed coaxially with the forward destination port and connected to the water supply return flow path;
Having a terminal side port connected to the water supply terminal,
The water supply system for a house according to claim 1, wherein the forward port, the return port, and the terminal port communicate with each other. On the water supply source side, the water supply circulation flow path, the water supply source side outgoing pipe constituting the water supply outgoing flow path, the water supply source side return pipe constituting the water supply return flow path, the water supply source side outgoing pipe and the water supply side outgoing pipe A double pipe main joint interposed between the water supply source side return pipe and the double pipe,
The double pipe joint,
An outward path source port connected to the water supply outward flow path on the double pipe side,
A return port that is arranged coaxially with the forward path port and that is connected to the water return flow path on the double pipe side;
A water supply source-side outgoing port connected to the water supply source-side outgoing pipe,
A water supply source return port connected to the water supply source return pipe,
4. The method according to claim 1, wherein the forward port is connected to the water supply source-side forward port, and the return port is connected to the water supply source-side return port. 5. Residential water system. The water supply source is
A water supply storage unit that stores water from outside so that it can be supplied,
A water supply / water supply unit configured to supply water in the water supply storage unit to the plurality of water supply terminals via the water supply circulation channel,
The water supply storage unit and the water supply / water supply unit are provided in the water supply circulation channel,
The water supply water supply unit housing the water supply system of claim 4, characterized in that also serves as the circulating means. The inlet side of the water supply / water supply unit is connected to the water supply storage unit,
An upstream end of the water supply source-side outgoing pipe is connected to a discharge port side of the water supply / water supply unit,
The downstream end of the water supply source side return pipe, residential water supply system according to claim 5, characterized in that connected to the water supply reservoir. The water supply source is
Directly connected water supply unit for supplying water from the outside to the plurality of water supply terminals via the water supply circulation flow path,
The directly connected water supply unit is provided in the water supply circulation channel,
The water supply system for a house according to claim 4, wherein the direct water supply unit also serves as the circulation unit. An upstream end of the water supply source-side outgoing pipe is connected to a discharge port side of the directly connected water supply / water supply unit,
The water supply system for a house according to claim 7, wherein a downstream end of the water supply source side return pipe is connected to a suction port side of the direct water supply water supply unit.

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