JP2008039268A - Circulating hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circulating hot water supply system capable of simplifying construction work of hot water supply piping, reducing construction costs, narrowing a piping space, discharging hot water immediately after turning on hot water supply taps, and solving the problem of generation of waste water. <P>SOLUTION: The circulating hot water supply system includes a hot water storage tank 2, the plurality of hot water supply taps 3, a hot water delivering single pipe 4 and a water supply pipe 5 connected with the hot water storage tank 2, a hot water return single pipe 7 connected with an intermediate part of the hot water delivering single pipe 4 at its tip, and a hot water delivering/hot water return common pipe 10 connecting the hot water supply taps 3, the hot water delivering single pipe 4 and the hot water return single pipe 7 through a hot water supply header 8. The hot water delivering/hot water return common pipe 10 is formed by partitioning an internal circulation passage of the common pipe 10 into a hot water delivering pipe conduit 16 and a hot water return pipe conduit 17 by a partitioning wall 15 continued in the pipe axial direction, and terminals of the hot water delivering pipe conduit 16 and the hot water return pipe conduit 17 are faced to the inside of hot water inflow ports of the hot water supply taps 3, respectively. The inside of the hot water supply header 8 is divided by a cylindrical portion partitioning wall 21 and a plurality of branched portion partitioning walls 2 to be divided into a plurality of segmented hot water delivering passages 23 arranged in the cylindrical shaft direction and a hot water return passage 24 continued to the segmented hot water delivering passages 23 of ends in the cylindrical shaft direction at its end. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an immediate hot water type circulation hot water supply system capable of quickly discharging hot water in a hot water storage tank for storing hot water for hot water supply from a hot water tap such as a faucet at the end of a hot water supply piping system or a shower head.

  As a hot water type hot water supply system, a hot water supply circulation circuit that can circulate hot water with a pump is configured in the hot water supply piping system, and the hot water in the hot water supply circulation circuit is maintained at a desired temperature, There is one in which the hot water in the hot water supply circulation circuit comes out immediately when the hot water tap is opened (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 61-89442 (FIG. 4)

However, in the above hot water type hot water supply system, the hot water return pipe (return hot water pipe) for returning hot water from the hot water tap to the hot water heater side is the hot water supply pipe (hot water supply pipe) connecting the hot water tap and the hot water heater. It is necessary to perform piping separately, resulting in an increase in the number of piping construction processes, high construction costs, and a large piping space.
Also, when connecting taps such as faucets and shower heads and hot water supply pipes, branch pipes and shower hoses from the hot water supply pipes connected between the liquid inlet of the hot water tap and the hot water supply pipes, etc. The liquid inlet of the hot water tap is connected to the tip of the relay pipe member. In such a case, even when the hot water in the hot water supply pipe is kept warm at the normal time when the hot water tap is closed, the hot water in the relay pipe member is cooled. For this reason, when hot water is discharged from the hot water tap, first, the cold water in the hot water tap and the relay pipe member is discharged, so that waste water is wasted.

The present invention has been made to solve such problems, and the object of the present invention is to supply hot water in the hot water storage tank as described above to each hot water tap through the hot water supply pipe. In addition, in the circulating hot water supply system in which hot water is returned from each hot water tap to the hot water storage tank side via the hot water return pipe and circulated, the hot water supply pipe and the hot water return pipe have special hot water supply and hot water return. An object of the present invention is to provide a circulating hot water supply system capable of simplifying the construction of hot water supply piping, reducing the construction cost, and narrowing the piping space by using a common pipe and a hot water header.
In addition, the purpose of the present invention is to devise the connection structure of the end of the above-mentioned common pipe for supplying and returning hot water to each hot water tap so that the hot water always enters the hot water inlet of each hot water tap when each hot water tap is closed. The purpose of the present invention is to provide a circulating hot water supply system that can discharge the hot water as soon as the tap is opened, thereby eliminating the problem of waste water generation.

The circulating hot water supply system according to the present invention will be described with reference to the reference numerals attached to FIGS. 1 to 4 in order to facilitate understanding of the contents of the invention. A hot water storage tank (2), a plurality of hot water taps (3), a single hot water supply pipe (4) and a water supply pipe (5) connected to the hot water storage tank (2), and a single hot water supply pipe (4) Hot water supply pipe (7) with the tip connected to the middle part of the hot water supply pipe (4) and each end of the hot water supply single pipe (7) and each hot water tap (3) A plurality of hot water supply / return hot water common pipes (10) connected via a circulation pump (11) arranged in a single hot water return pipe (7),
The hot water supply / return hot water common pipe (10) includes a hot water supply pipe (16) and a hot water return pipe (17) by a partition wall (15) which continues the internal flow passage of the common pipe (10) in the pipe axis direction. Divided into
The hot-water supply header (8) has a cylindrical portion (19) having a cylindrical axial end opened and a cylindrical plug end (18) closed by a blind plug portion (18), and a plurality of branches branched from several portions of the cylindrical portion. The hot water supply header (8) has a cylindrical partition wall (21) continuous in the cylinder axis direction of the cylindrical portion (19) and each branch of the cylindrical partition wall (21). By partitioning with a plurality of branching part partition walls (22) extending from a location facing the part (20) to each branching port on a vertical plane orthogonal to the cylindrical part partitioning wall (21), they are arranged in the cylinder axis direction. It is divided into a plurality of divided hot water passages (23), a divided hot water passage (23) at the end in the cylinder axis direction, and a return hot water passage (24) where the ends are continuous,
The end of the single hot water supply pipe (10) is the divided hot water supply path (23) at the tip of the hot water supply header (8) in the cylinder axis direction, and the end of the single hot water return pipe (7) is the hot water supply header (8). Each is connected to the open end of the return hot water passage (24),
The tip of the hot water supply pipe (16) of each hot water supply / return hot water common pipe (10) and the tip of the hot water return pipe (17) are divided hot water supply paths (20) of each branch part (20) of the hot water supply header (8) ( 23)
The end of each hot-water supply / return hot water common pipe (10) has the end of the hot-water supply pipe (16) and the end of the hot-water return pipe (17) at the hot water inlet (27) of each hot water tap (3). The end of the hot water supply line (16) and the return water pipe line in the hot water inlet (27) of the hot water tap by closing the hot water tap (3) The terminal of (17) is characterized in that the hot water path is changed to a U shape through the internal space of the hot water inlet (27).

According to the circulation type hot water supply system having such a configuration, the hot water in the hot water storage tank (2) is supplied to each hot water tap (3), and the hot water is returned from each hot water tap (3) to the hot water storage tank side. As a hot water pipe, the internal flow passage of the common pipe (20) is partitioned by a partition wall (15) into a hot water supply pipe (16) and a hot water return pipe (17). By using this, the work of the hot water supply pipe and the hot water return pipe can be completed at the same place at the same time.
Each end of the hot water supply pipe (16) and the hot water return pipe (17) of the hot water supply / return hot water common pipe (10) reaches the inside of the hot water inlet (27) of each hot water tap (3). In addition, when the tap is in the closed state, the hot water path is made to turn in the hot water inlet (27), so that the hot water always flows in the tap (3) when the tap is in the closed state. Since it circulates to the inside of the inflow port (27), the hot water can be immediately discharged at the same time as the hot water tap (3) is opened.
Furthermore, as a hot water supply header (8) for joining each end of the single hot water supply pipe (4) and the single hot water return pipe (7) and the tip of the hot water supply / return hot water common pipe (10), the cylindrical portion (19) And a plurality of branch portions (20) branched from several places of the cylindrical portion, and the interior of the hot water supply header (8) has a cylindrical partition wall (21) and a plurality of branch portion partition walls ( 22) and divided into a plurality of divided hot water supply passages (23) arranged in the cylinder axis direction, a divided hot water supply passage (23) at the end in the cylindrical axis direction, and a return hot water passage (24) where the ends are continuous. Since it is formed, the jointing work of the hot water supply single pipe (4) and the return hot water single pipe (7) and the hot water supply / return hot water common pipe (10) is performed via the hot water supply header (8). Efficient and efficient use of hot water supply piping work combined with the use of hot water supply / return water common piping (10) Rukoto can.

  The circulating hot water supply system according to the present invention will be described with reference to the reference numerals attached to FIG. 5 in order to facilitate understanding of the contents of the invention. The circulating hot water supply system has a plurality of hot water taps (3) connected in series to the hot water header (8), whereas a plurality of hot water taps (3) are connected in parallel to the hot water header (31). Other than the above, the configuration similar to the configuration of the circulating hot water supply system according to the first aspect of the present invention is adopted. However, the hot water supply header (31) is connected to the plurality of hot water taps (3) in parallel, and the inside of the cylindrical portion (33) whose end in the cylindrical axis direction is closed by the blind plug portion (32) is in the cylindrical axis direction. Are divided into a hot water supply passage (36) and a return hot water passage (37) by partitioning with a cylindrical portion partition wall (35) continuous to each other, and the inside of each branch portion (34) is the cylindrical portion partition wall ( A branch part partition wall (38) in the same plane as the cylindrical part partition wall (35) extending from a position facing each branch part (34) of 35) to a branch port of each branch part (34); It is divided into a branched hot water supply path (39) communicating with the hot water supply path (36) and a branched hot water supply path (40) communicating with the return hot water path (37) by partitioning with a hot water supply path (36). The internal structure is slightly different from the hot water supply header (8) of the invention described in 1.

  The circulating hot water supply system according to claim 1 or claim 3 is connected to the circulating pump (11) and the hot water supply single pipe (4) on the return hot water single pipe (7). A reheating part (13) such as a heat exchanger or a heat pump can be provided between the parts.

The circulating hot water supply system according to any one of claims 1 to 3, as described in claim 4, is a bypass pipe (26) branched from the single hot water supply pipe (4) and the single hot water return pipe. When all of the taps (3) are in the closed state, the communication state between the bypass pipe (26) and the single hot water return pipe (7) is shut off between the middle part of (7) and the hot tap ( When any one of 3) is opened, it is possible to provide a switching section (29) for switching the hot water flow direction so that the bypass pipe (26) and the single hot water return pipe (7) communicate with each other.
According to such a configuration, when any of the hot water taps (3) is opened by the switching unit (29), the bypass pipe (26) and the single hot water return pipe (7) are communicated with each other. Hot water is sent from both the hot water supply pipe (16) and hot water supply pipe (17) of the hot water supply / return hot water common pipe (10) to the hot water tap (3) to be opened. It is possible to reduce a decrease in the hot water discharge flow rate from 3).

  According to the present invention, the work of the hot water supply pipe and the hot water return pipe can be completed at the same place and at the same time, and the hot water single pipe and the joint pipe work of the single hot water return pipe and the common hot water supply / return hot water pipe Is efficiently performed via the hot water supply header, which can advantageously simplify the construction of the hot water supply piping, reduce the construction cost, and narrow the piping space. Moreover, since the hot water can be discharged immediately at the same time as opening the tap, the problem of wasteful wastewater generation can be solved.

  A preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a state of a circulating hot water supply system according to an embodiment of the present invention when all of the outlet taps are in a closed state, and FIG. 2 is a diagram showing one of the outlet taps of the circulating hot water system of FIG. FIG. 3A to FIG. 3F are cross-sectional views of various cross-sectional hot water / return hot water common pipes used in the circulating hot water supply system of FIG. 1, and FIG. It is sectional drawing which shows the connection structure of the hot-water tap used for the circulation type hot-water supply system of 1 and the terminal part of hot-water supply / return hot water shared piping.

  As shown in FIG. 1, a circulating hot water supply system 1 according to an embodiment of the present invention includes a hot water storage tank 2 for storing hot water for hot water supply, and a plurality of hot water taps 3 such as a faucet and a shower head at the end of the hot water supply piping system. In the illustrated example, the first hot-water tap 3A, the second hot-water tap 3B, and the third hot-water tap 3C), the single hot water supply pipe 4 and the water supply pipe 5 connected to the hot water storage tank 2, and the single hot water supply pipe. 4 is connected to the hot water single pipe 7, the hot water single pipe 4 and the single hot water pipe 7, and the taps 3 via the hot water supply header 8. The hot water / return hot water common pipe 10 (first, second, third hot water / return hot water common pipes 10A, 10B, 10C in the illustrated example) and the circulating pump 11 provided in the hot water single pipe 7 And.

  The hot water supply pipe 5 is piped between the lower part of the hot water storage tank 2 and a water supply source such as a water supply, the hot water supply single pipe 4 is piped between the upper part of the hot water storage tank 2 and the hot water supply header 8, and the single hot water return pipe 7 is fed. It is piped between the middle part of the hot water single pipe 4 and the hot water supply header 8. A first check valve 12 for preventing the backflow of hot water into the hot water storage tank 2 is provided in the vicinity of the connecting portion of the hot water supply single pipe 4 with the hot water storage tank 2. A reheating unit 13 such as a heat exchanger or a heat pump is provided between the circulation pump 11 on the return hot water single pipe 7 and the connection portion of the hot water supply single pipe 4 to reheat the return hot water and supply hot water. The single pipe 4 is circulated back through the second check valve 14.

  As shown in FIGS. 3A to 3F, each hot water supply / return hot water common pipe 10 is returned to the hot water supply pipe 16 by a partition wall 15 which continues the internal flow passage of the common pipe 10 in the pipe axis direction. The hot water pipe 17 is partitioned. 3A to 3F illustrate the hot water supply / return water common pipe 10 having various cross-sectional shapes. 3 (a) has a partition wall 15 that partitions the internal flow passage of the common pipe 10 having a circular cross section in a cross-sectional shape that extends straight in the diameter direction. 3 (b) has a partition wall 15 that partitions the internal flow passage of the common pipe 10 having a circular cross section, and has an S-shaped cross section in the diameter direction. 3 (c), the partition wall 15 for partitioning the internal flow passage of the common pipe 10 having a circular cross section is formed in a concentric circular shape. 3 (d) shows a partition wall 15 for partitioning the internal flow passage of the common pipe 10, and the cross-sectional shape of the common pipe 10 includes both the hot water supply pipe 16 and the hot water supply pipe 17. It is formed into a shape that forms a glass shape with a circular cross section. 3 (e) has a partition wall 15 in which the hot water supply pipe 16 and the hot water return pipe 17 in the common pipe 10 having a circular cross section are both circular in cross section. Yes. 3 (f), a shared hot water / return hot water pipe 10 has a partition wall 15 that partitions the internal flow passage of the shared pipe 10 having a circular cross section in a circular shape inscribed in a part of the inner periphery of the shared pipe 10. .

  The hot-water supply header 8 has a cylindrical portion 19 having a cylindrical axial end opened and a cylindrical axial end closed by a blind plug portion 18, and a plurality (the same number as the number of hot-water taps 3) branched from several portions of the cylindrical portion 19. ) Branching section 20 (first to third branching sections 20A, 20B, 20C in the illustrated example). Inside the hot water supply header 8 is a cylindrical partition wall 21 that is continuous in the cylinder axis direction of the cylindrical portion 19, and a vertical direction perpendicular to the cylindrical partition wall 21 from a location facing each branching portion 20 of the cylindrical partition wall 21. A plurality of divided hot water passages 23 (in the illustrated example, four first to fourth divided hot water passages) lined up in the cylinder axis direction by partitioning with a plurality of branch portion partition walls 22 extending to each branch port on a plane. 23A, 23B, 23C, 23D), a divided hot water supply passage (fourth divided hot water supply passage) 23D at the end of the cylinder axis direction, and a hot water return passage 24 having a continuous end.

At the time of hot water supply circulation piping, the end of the single hot water supply pipe 4 is connected to the open end of the first divided hot water supply passage 23A at the tip of the hot water supply header 8 in the cylinder axis direction, and the end of the single hot water return pipe 7 is connected to the return of the hot water supply header 8. Connected to the open end of the runner 24.
The tip of the hot water supply pipe 16 and the tip of the hot water return pipe 17 of each hot water supply / return hot water common pipe 10 are connected to the divided hot water supply passages 23, 23 of the branch portions 20 of the hot water supply header 8, respectively. That is, the tip of the hot water supply pipe 16 of the first hot water supply / return hot water common pipe 10A is connected to one divided hot water supply path 23 of the first branch 20A of the hot water supply header 8, and the tip of the hot water return pipe 17 is the first. It is connected to another divided hot water supply path 23 of the one branch part 20A. Similarly, the tip of each of the hot water supply pipes 16 of the second and third hot water supply / return hot water common pipes 10B and 10C is one divided hot water supply path of each of the second and third branch portions 20B and 20C of the hot water supply header 8. 23, the tip of each hot water return pipe line 17 is connected to another divided hot water supply path 23 of each of the second and third branch portions 20B and 20C.

  As shown in FIG. 4, the end of each hot water supply pipe 16 and the end of the hot water return pipe 17 of the first, second and third hot water supply / return hot water common pipes 10A, 10B, 10C are the first, second, The first, second, and third hot water taps 3A, 3B, and 3C are connected to the hot water outlets 3A, 3B, and 3C of the third hot water taps 3A, 3B, and 3C through the tubular fittings 28, thereby When the taps 3A, 3B, 3C are closed, the hot water from the end of the hot water supply pipe 16 is always turned inside the hot water inlet 27 in the hot water inlet 27 and into the hot water inlet 27. Circulate until.

  In this way, the hot water supply / return hot water common pipes 10A, 10B, 10C are used for the hot water supply circulation pipe for connecting the plurality of hot water taps 3A, 3B, 3C in series to the hot water supply header 8, thereby returning the hot water supply pipe and the return pipe. Hot water piping can be piped at the same place and at the same time, piping efficiency is good, and workability is excellent.

Between the bypass pipe 26 branched from the single hot water supply pipe 4 and the intermediate part of the single hot water return pipe 7, a switching unit 29 is provided by a three-way switching valve or the like for switching the direction of hot water flow.
When all of the taps 3A, 3B, 3C are closed by the switching unit 29, the hot water is supplied from the hot water storage tank 2 to the first check valve 12 → the single hot water supply pipe 4 → the hot water supply header 8 as shown in FIG. First hot water supply passage 23A → first hot water supply / return water common pipe 10A hot water supply pipe 16 → first outlet tap 3A hot water inlet 27 → first hot water supply / return water common pipe 10A hot water return pipe 17 → second divided hot water supply path 23B → second hot water supply / return hot water common pipe 10B hot water supply pipe 16 → second outlet tap 3B hot water inlet 27 → second Hot water supply line 17 of the hot water supply / return hot water common pipe 10B → Third divided hot water supply path 23C → Hot water supply line 16 of the third hot water supply / return hot water common pipe 10C → Hot water of the third outlet tap 3C Inlet 27 → Hot water return line 17 of third hot water supply / return hot water common pipe 10C → Fourth divided hot water supply path 23D → Return hot water path 24 → Return hot water single pipe 7 → Switch 29 → Circulation It is switched back to the pump 11 → reheating unit 13 → the second check valve 14 → Okuyu dedicated pipe 4.
The second hot water supply / return hot water facing the inflow port 27 of the second hot water tap 3B by opening one of the hot water taps 3A, 3B, 3C, for example, opening the second hot water tap 3B. As soon as hot water from the hot water supply pipe 16 of the common pipe 10B is discharged, the hot water is supplied from the hot water supply single pipe 4 through the bypass pipe 26 as shown in FIG. 7, the hot water supply path 24 of the hot water supply header 8 → the fourth divided hot water supply path 23 </ b> D → the hot water supply pipe 17 of the third hot water supply / return hot water common pipe 10 </ b> C → the inlet of the third hot water tap 3 </ b> C. 27 → Third hot water supply / return water common pipe 10C hot water supply pipe 16 → Third divided hot water supply path 23C → Second hot water supply / return hot water common pipe 10B return hot water pipe 17 → second It is made to flow to the inlet 27 of the tap tap 3B. That is, when the second hot-water tap 3B is opened, the second hot water is supplied from both the hot water supply pipe 16 and the hot water supply pipe 17 of the second hot water supply / return hot water common pipe 10B by switching the switching unit 29. To the hot water tap 3B.

  Next, the operation of the circulating hot water supply system 1 configured as described above will be described.

As shown in FIG. 1, when all of the first, second, and third hot water taps 3A, 3B, and 3C are closed, the circulation pump 11 is operated at low speed or intermittently, and the bypass pipe 26 and the hot water alone are used. The three-way switching valve that is the switching unit 29 is switched so that the communication state with the pipe 7 is blocked. Accordingly, the hot water storage tank 2 → the first check valve 12 → the single hot water supply pipe 4 → the first divided hot water supply passage 23A of the hot water supply header 8 → the hot water supply pipe 16 of the first hot water supply / return hot water common pipe 10A. → Hot water inlet 27 of the first tap tap 3A → Hot water return pipe 17 of the first hot water supply / return water common pipe 10A → Second divided hot water supply path 23B → Second hot water supply / return water common pipe 10B hot water supply pipe 16 → second hot water inlet 27 of the second hot water tap 3B → second hot water supply / return hot water common pipe 10B return hot water pipe 17 → third divided hot water supply path 23C → third Hot water supply pipe 16 of the hot water supply / return hot water common pipe 10C → The hot water inlet 27 of the third hot water tap 3C → The hot water supply pipe 17 of the third hot water supply / return hot water common pipe 10C → the fourth divided hot water supply Path 23D → return hot water path 24 → return hot water single pipe 7 → switching section 29 → circulation pump 11 → reheating section 13 → second check valve 14 → return to the hot water supply single pipe 4 and hot water storage tank 2 It flows in the same order as described above via et first check valve 12, circulates it repeatedly.
Thus, the temperature of the hot water in each pipe can be maintained by circulating the hot water in the hot water storage tank 2 little by little.

Now, of the first, second, and third outlet taps 3A, 3B, and 3C, for example, when the second outlet tap 3B is opened, the electrical signal generated from the outlet tap 3B or the return hot water single pipe 7 As shown in FIG. 2, the three-way switching valve, which is the switching unit 29, causes hot water to flow from the single hot water supply pipe 4 to the single hot water return pipe 7 via the bypass pipe 26, as shown in FIG. Is also switched to flow. At this time, the operation of the circulation pump 11 is stopped. When the second hot-water tap 3B is opened, the second hot water supply / return hot water facing the inlet 27 of the second hot-water tap 3B by the internal pressure (water pressure) in the hot water storage tank 2 is opened. Hot water from the hot water supply pipe 16 of the common pipe 10B is immediately discharged, and at the same time, hot water is supplied from the single hot water supply pipe 4 through the bypass pipe 26 with the switching of the three-way switching valve as the switching unit 29. It also flows into the pipe 7, and the hot water supply path 24 of the hot water supply header 8 → the fourth divided hot water supply path 23D → the hot water supply pipe 17 of the third hot water supply / return hot water common pipe 10C → the flow of the third hot water tap 3C. The inlet 27 → the hot water supply pipe 16 of the third hot water supply / return water common pipe 10C → the third divided hot water supply path 23C → the hot water supply pipe 17 of the second hot water supply / return hot water common pipe 10B → second It flows into the inlet 27 of the hot water tap 3B and is discharged together with hot water from the hot water supply pipe 16 of the second hot water supply / return hot water common pipe 10B.
As described above, when the second hot-water tap 3B is opened, hot water is discharged immediately, so that no waste water is generated. In addition, both the hot water supply pipe 16 and the hot water supply pipe 17 of the second hot water supply / return hot water common pipe 10B are connected to the second hot water tap 3B which is opened by switching of the three-way switching valve which is the switching unit 29. Since hot water is sent from the second hot water tap 3B, it is possible to reduce a decrease in the discharge flow rate from the second hot water tap 3B.

In the embodiment shown in FIG. 1, a plurality of taps 3A, 3B, 3C are connected to the hot water supply header 8 in series via hot water supply / return hot water common pipes 10A, 10B, 10C, but as shown in FIG. In addition, a plurality of taps 3A, 3B, 3C can be connected to the hot water supply header 31 in parallel via the hot water supply / return water common pipes 10A, 10B, 10C. However, in this case, as the hot water supply header 31, a parallel specification type in which a plurality of hot water taps 3A, 3B, 3C are changed to a shape having an internal flow path that can be connected in parallel is used.
That is, as shown in FIGS. 5 and 7, the parallel specification type hot water supply header 31 includes a cylindrical portion 33 having a cylindrical axial end opened and a cylindrical axial end closed by the blind plug portion 32, and the cylindrical portion. And a plurality of branch portions 34 (first, second, and third branch portions 34A, 34B, and 34C in the illustrated example) branched from several 33 locations. The inside of the cylindrical portion 33 is partitioned into a hot water supply passage 36 and a hot water return passage 37 by partitioning with a cylindrical partition wall 35 continuous in the cylinder axis direction. The insides of the first, second, and third branch portions 34A, 34B, and 34C are connected to the branch ports of the branch portions 34A, 34B, and 34C from locations facing the branch portions 34A, 34B, and 34C of the cylindrical partition wall 35. A branch hot water supply path 39 communicating with the hot water supply path 36 and a branch hot water supply path 40 communicating with the hot water return path 37 are partitioned by the cylindrical part partition wall 35 extending to the end and the branch part partition wall 38 in the same plane. It is divided into and.

  The end of the single hot water supply pipe 4 is connected to the tip of the hot water supply path 36 of the cylindrical portion 33, and the end of the single hot water supply pipe 7 is connected to the front end of the hot water supply path 37 of the cylindrical portion 33.

  The tip of the hot water supply pipe 16 and the tip of the hot water return pipe 17 of each hot water supply / return hot water common pipe 10 are connected to the branch hot water supply path 39 and the branch hot water supply path 40 of each branch part 34 of the hot water supply header 31, respectively. The That is, the tip of the hot water supply pipe 16 of the first hot water supply / return hot water common pipe 10A is the branch hot water supply path 39 of the first branch portion 34A of the hot water supply header 31, and the tip of the hot water return pipe 17 is the first. Are connected to the branch return hot water passages 40 of the branch portions 34A. Similarly, the tips of the hot water supply pipes 16 of the second and third hot water supply / return hot water common pipes 10B and 10C are connected to the branch hot water supply paths 39 of the second and third branch parts 34B and 34C of the hot water supply header 31, respectively. The tips of the hot water return pipes 17 are connected to the branch hot water supply paths 40 of the second and third branch portions 34B and 34C, respectively.

  In this embodiment, as in the embodiment shown in FIG. 1, as shown in FIG. 4, the hot water supply / return hot water common pipes 10A, 10B, 10C of the first, second, and third hot water supply pipes are provided. The end of 16 and the end of the return pipe 17 are connected to the first, second and third hot water taps 3A so as to face the insides of the first, second and third hot water taps 3A, 3B and 3C. , 3B, 3C and the tubular pipe joint 28, so that the hot water from the end of the hot water supply pipe line 16 is always returned in the hot water inlet 27 when the taps 3A, 3B, 3C are closed. The end of the pipe line 17 is turned to circulate to the inside of the hot water inlet 27.

  A circulation pump 11 is disposed in the single hot water return pipe 7, and a switching unit 29 such as a three-way switching valve is provided between the bypass pipe 26 branched from the single hot water supply pipe 4 and the intermediate portion of the single hot water return pipe 7. Providing a first check valve 12 for preventing the backflow of hot water into the hot water storage tank 2 in the vicinity of the connecting portion of the single hot water supply pipe 4 and the hot water storage tank 2, and a circulation pump 11 for the return hot water single pipe 7 The reheating part 13 by a heat exchanger, a heat pump, or the like is provided between the connecting part of the hot water supply single pipe 4 and the like, as in the case of the circulating hot water supply system 1 shown in FIG.

  Next, the operation of the circulating hot water supply system 1 shown in FIG. 5 will be described.

  As shown in FIG. 5, when all of the first, second, and third outlet taps 3A, 3B, and 3C are in the closed state, the circulation pump 11 is operated at low speed or intermittently, and the bypass pipe 26 and the return hot water alone The three-way switching valve that is the switching unit 29 is switched so that the communication state with the pipe 7 is blocked. Accordingly, the hot water storage tank 2 → the first check valve 12 → the single hot water supply pipe 4 → the hot water supply path 36 of the cylindrical portion 33 of the hot water supply header 31 → the respective branches of the first, second, and third branch portions 34A, 34B, and 34C. Hot water supply passage 39 → each hot water supply pipe 16A of the first, second, and third hot water supply / return hot water common pipes 10A, 10B, and 10C → each hot water flow of the first, second, and third outlet taps 3A, 3B, and 3C The inlet 27 → the hot water return pipes 17 for the first, second, and third hot water supply / return hot water common pipes 10A, 10B, and 10C → the branch hot water supply paths for the first, second, and third branch portions 34A, 34B, and 34C 40 → Return water passage 37 of the cylindrical portion 33 → Return water single pipe 7 → Switching section 29 → Circulating pump 11 → Reheating section 13 → Second check valve 14 → Return to the single hot water supply pipe 4 and the hot water storage tank 2 To the first check valve 12 and flow in the same order as described above, and circulate repeatedly. Thus, the temperature of the hot water in each pipe can be maintained by circulating the hot water in the hot water storage tank 2 little by little.

Now, of the first, second, and third outlet taps 3A, 3B, and 3C, for example, when the second outlet tap 3B is opened, the electrical signal generated from the outlet tap 3B or the return hot water single pipe 7 As shown in FIG. 6, the three-way switching valve, which is the switching unit 29, causes hot water to flow from the single hot water supply pipe 4 to the single hot water return pipe 7 via the bypass pipe 26, as shown in FIG. Is also switched to flow. At this time, the operation of the circulation pump 11 is stopped. When the second hot-water tap 3B is opened, the second hot water supply / return hot water facing the inlet 27 of the second hot-water tap 3B by the internal pressure (water pressure) in the hot water storage tank 2 is opened. Hot water from the hot water supply pipe 16 of the common pipe 10B is immediately discharged, and at the same time, hot water is supplied from the single hot water supply pipe 4 through the bypass pipe 26 with the switching of the three-way switching valve as the switching unit 29. It also flows into the pipe 7, and the hot water return path 37 of the hot water supply header 31 → the branch hot water path 40 of the second branch portion 34B → the hot water return pipe line 17 of the second hot water supply / return hot water common pipe 10B → the second hot water outlet. It flows into the inlet 27 of the plug 3B and is discharged together with hot water from the hot water supply pipe 16 of the second hot water supply / return hot water common pipe 10B.
As described above, when the second hot-water tap 3B is opened, hot water is discharged immediately, so that no waste water is generated. In addition, both the hot water supply pipe 16 and the hot water supply pipe 17 of the second hot water supply / return hot water common pipe 10B are connected to the second hot water tap 3B which is opened by switching of the three-way switching valve which is the switching unit 29. Since hot water is sent from the second hot water tap 3B, it is possible to reduce a decrease in the discharge flow rate from the second hot water tap 3B.

  The hot water supply header 8 of the serial specification type shown in FIG. 1 is composed of a cylindrical part 19 and a plurality of branch parts 20 as a whole, but instead, the hot water supply header 8 has a cylindrical part 19 as shown in FIG. Are divided into a plurality of T-shaped header constituent members 8A, 8B, and 8C in the cylinder axis direction so as to separate a portion C corresponding to the adjacent branch portions 20 and 20, and these header constituent members 8A, 8B, 8C may be connected in series, and the blind plug portion 18 may be attached to the header component member 8C at the end.

  Further, the parallel specification type hot water supply header 31 shown in FIG. 5 includes a cylindrical portion 33 and a plurality of branch portions 34, which are integrally formed as a whole, but instead of this, as shown in FIG. The header C is divided into a plurality of header components 31A, 31B, 31C in the cylinder axis direction so as to separate the portion C corresponding to the branch portions 34, 34, and these header components 31A, 31B, 31C are connected in series. The blind plug portion 32 may be attached to the header component 31C at the end.

It is a block diagram which shows the state when all the hot-water taps are in the closed state in the circulation type hot-water supply system of one Example of this invention. It is a block diagram which shows the state when one of the taps is opened in the circulation type hot-water supply system of FIG. (A)-(f) is sectional drawing of the hot water supply / return hot water shared piping used for the circulation type hot water supply system of FIG. It is sectional drawing which shows the connection structure of the hot-water tap used for the circulation type hot-water supply system of FIG. It is a block diagram which shows the state when all the hot-water taps are in the closed state in the circulation type hot-water supply system which shows another Example. It is a block diagram which shows a state when one of the taps is opened in the circulation type hot-water supply system of FIG. It is sectional drawing of the hot water supply header used for the circulation type hot water supply system of FIG. It is a front view which shows the other example of the hot water supply header used for the circulation type hot water supply system of FIG. It is a top view which shows the other example of the hot water supply header used for the circulation type hot water supply system of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Circulation type hot water supply system 2 Hot water storage tank 3 (3A, 3B, 3C) Outlet tap 4 Single hot water supply piping 7 Single hot water return piping 8 Series specification type hot water supply header 10 (10A, 10B, 10C) Hot water supply / hot water common piping DESCRIPTION OF SYMBOLS 11 Circulation pump 13 Reheating part 15 Partition wall 16 Hot water supply pipe 17 Hot water return pipe 18 Blind plug part of the hot water header 8 19 Cylindrical part of the hot water header 8 20 Branch part of the hot water header 8 21 Cylindrical part of the hot water header 8 Partition wall 22 Dividing part partition wall of hot water supply header 8 23 Divided hot water supply path of hot water supply header 8 24 Return hot water path of hot water supply header 8 26 Bypass pipe 27 Hot water inlet of outlet tap 3 29 Switching unit 31 Hot water supply header of parallel specification type 32 Blind plug part of hot water header 31 33 Cylindrical part of hot water header 31 34 Branch part of hot water header 31 35 Cylindrical partition wall of hot water header 31 36 Hot water Hot water supply path of the header 31 37 Hot water return path of the hot water header 31 38 Dividing partition wall of the hot water header 31 39 Branch hot water path of the hot water header 31 40 Branch hot water path of the hot water header 31

Claims (4)

A hot water storage tank for storing hot water for hot water supply, a plurality of hot water taps, a single hot water supply pipe and water supply pipe connected at the tip to the hot water storage tank, and a hot water return connected at the middle of the single hot water supply pipe Arranged in a single pipe, a plurality of hot water supply / return hot water common pipes connecting each end of the single hot water supply pipe and the single hot water return pipe and the hot water tap through a hot water header, and the single hot water return pipe And a circulating pump
The hot water supply / return hot water common pipe is divided into a hot water supply pipe and a hot water return pipe with a partition wall continuous in the axial direction of the internal flow passage of the common pipe,
The hot-water supply header has a cylindrical portion having a cylindrical axial end opened and a cylindrical axial end closed by a blind plug portion, and a plurality of branch portions branched from several portions of the cylindrical portion. The inside of the cylindrical portion extends from the portion facing the branching portion of the cylindrical portion partition wall in the direction of the cylindrical axis of the cylindrical portion to each branching port on a vertical plane orthogonal to the cylindrical portion partitioning wall. By partitioning with a plurality of branching part partition walls, a plurality of divided hot water passages arranged in the cylinder axis direction, a divided hot water passage at the end of the cylindrical axis direction, and a return hot water passage where the ends are continuous,
The end of the single hot water supply pipe is connected to the divided hot water supply path at the tip of the hot water supply header in the cylinder axis direction, and the end of the single hot water return pipe is connected to the open end of the hot water supply path of the hot water supply header, respectively.
The tip of the hot water supply pipe of each hot water supply / return hot water common pipe and the tip of the hot water return pipe are connected to the divided hot water supply path of each branch part of the hot water supply header,
The end of each hot water supply / return hot water common pipe is connected to the hot water tap such that the end of the hot water supply pipe and the end of the hot water return pipe both face the inside of the hot water inlet of the hot water tap, By closing the hot water tap, the end of the hot water supply pipe and the end of the return hot water pipe are changed into a U shape through the internal space of the hot water inlet in the hot water inlet of the hot water tap. A circulating hot water supply system characterized by A hot water storage tank for storing hot water for hot water supply, a plurality of hot water taps, a single hot water supply pipe and water supply pipe connected at the tip to the hot water storage tank, and a hot water return connected at the middle of the single hot water supply pipe Arranged in a single pipe, a plurality of hot water supply / return hot water common pipes connecting each end of the single hot water supply pipe and the single hot water return pipe and the hot water tap through a hot water header, and the single hot water return pipe And a circulating pump
The hot water supply / return hot water common pipe is divided into a hot water supply pipe and a hot water return pipe with a partition wall continuous in the axial direction of the internal flow passage of the common pipe,
The hot-water supply header has a cylindrical portion having a cylindrical axial end opened and a cylindrical axial end closed by a blind plug portion, and a plurality of branched portions branched from several portions of the cylindrical portion. Is divided into a hot water supply passage and a return hot water passage by partitioning with a cylindrical partition wall continuous in the cylinder axis direction, and the interior of each branch portion is located in each branch portion of the cylindrical partition wall To the branch water supply path and the return hot water path connected to the hot water supply path by partitioning with the cylindrical partition wall extending to the branch port of each branch part and the branch part partition wall in the same plane It is divided into a branch return hot water path that
The end of the single hot water supply pipe is connected to the tip of the hot water supply path of the cylindrical part, and the end of the single hot water return pipe is connected to the front of the hot water supply path of the cylindrical part,
The tip of the hot water supply pipe of each hot water supply / return hot water common pipe is a branch hot water supply path of each branch part of the hot water supply header, and the tip of the hot water return pipe of each hot water supply / return hot water common pipe is of the hot water supply header. It is connected to the branch hot water supply path of each branch part,
The end of each hot water supply / return hot water common pipe is connected to the hot water tap such that the end of the hot water supply pipe and the end of the hot water return pipe both face the inside of the hot water inlet of the hot water tap, By closing the hot water tap, the end of the hot water supply pipe and the end of the return hot water pipe are changed into a U shape through the internal space of the hot water inlet in the hot water inlet of the hot water tap. A circulating hot water supply system characterized by   The circulating hot water supply according to claim 1 or 2, wherein a reheating unit such as a heat exchanger or a heat pump is provided between a connection part of the circulating pump on the return hot water single pipe and the hot water supply single pipe. system. Between the bypass pipe branched from the single hot water supply pipe and the intermediate part of the single hot water return pipe, when all of the hot water taps are in a closed state, the bypass pipe and the single hot water return pipe are in communication with each other. The switch part which switches the flow direction of hot water so that the said bypass pipe and the said hot water single piping will be connected when either of the said hot-water taps is opened is provided. The circulating hot water supply system according to any one of the above.

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