JP2008039266A - 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 a hot water supply tap, 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 hot water supply pipe 5 connected with the hot water storage tank 2, a hot water return single pipe 7 connected with a bypass pipe 6 branched from the water supply pipe 5, and a hot water delivering/hot water return common pipe 10 connecting the hot water delivering single pipe 4, the hot water return single pipe 7 and the hot water supply taps 3 through a pipe joint 8. The hot water delivering/hot water return common pipe 10 is formed by dividing 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 ends 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. The pipe joint 8 has a branch portion 19 for defining and forming a first circulation passage 21 and a second circulation passage 22, a third circulation passage 25a communicated with the first circulation passage 21, a forth circulation passage 25b communicated with the second circulation passage 22, and a cylindrical portion 18 for defining and forming a fifth circulation passage 26. <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 or a shower head at the end of a hot water supply piping system.

  As an instant 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 hot water in the hot water supply circulation circuit is immediately discharged when the tap 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 steps, high construction costs, and a large piping space.
Also, when connecting taps such as faucets and shower heads to hot water supply pipes, branch pipes and shower hoses from hot water supply pipes connected between the liquid inlet of hot water taps and hot water supply pipes, etc. A liquid inlet of a 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, firstly, the cold water in the hot water tap and the relay pipe member is discharged, resulting in wasted waste water.

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 that can simplify the construction of hot water supply piping, reduce the construction cost, and narrow the piping space by using a common pipe and a pipe joint.
In addition, the purpose of the present invention is to devise the connection structure of the end of the above-mentioned common pipe for feeding 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 hot water tap is opened so that the problem of waste water generation can be solved.

  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 hot water supply single pipe (4) and a water supply pipe (5) connected to the hot water storage tank (2), and a branch from the water supply pipe (5) A single hot water return pipe (7) whose tip is connected to the bypass pipe (6), and each end of the single hot water supply pipe (4) and the single hot water return pipe (7) and the tap (3) 8) A hot water supply / return hot water common pipe (10) connected via the pipe and a circulation pump (11) disposed in the single hot water return pipe (7) are provided. (10) is a partition wall (15) that continues the internal flow passage of the common pipe (10) in the direction of the pipe axis, and a hot water supply pipe (16) and a hot water return pipe (17) The pipe joint (8) is formed into a T shape having a cylindrical part (18) and a branched part (19) branched from the cylindrical part, and the inside of the branched part (19) is a branched part partition wall. By partitioning with (20), the first flow path (21) and the second flow path (22) are partitioned and formed, and the inside of the cylindrical part (18) is a first partition wall (20) extending from the branch part partition wall (20). 23) and a second partition wall (24) continuous in the cylinder axis direction, whereby a third flow passage (in the form of communication from the first flow passage (21) to one end opening of the cylindrical portion (18) ( 25a), a fourth flow passage (25b) that communicates from the second flow passage (22) to the other end opening of the cylindrical portion (18), and the other end opening from the one end opening of the cylindrical portion (18). A section is formed in the fifth flow passage (26) penetrating over the portion, and the end of the single hot water supply pipe (4) is a pipe joint (8 The terminal of the single hot water return pipe (7) is connected to the second flow path (22) of the pipe joint (8), respectively, and the hot water supply / hot water common pipe (10). The tip of the hot water supply pipe (16) is in the third flow passage (25a) of the pipe joint (8), and the tip of the hot water return pipe (17) is in the fifth flow passage (26) of the pipe joint (8). The end of the hot water supply / return hot water common pipe (10) is connected to the end of the hot water supply pipe (16) and the end of the hot water return pipe (17). The hot water supply pipe (3) is connected to the hot water tap (3) so as to face the inside of the inlet (27), and the hot water supply pipe (16) is closed in the hot water inlet (27) of the hot water tap (3) by closing the hot water tap (3). The terminal and the terminal of the hot water return pipe line (17) are characterized in that the hot water path is changed into a U shape via the internal space of the hot water inlet (27).

According to the circulation type hot water supply system having such a configuration, as a hot water supply pipe for feeding hot water in the hot water storage tank (2) to each hot water tap (3), and a hot water return pipe for returning hot water from each hot water tap to the hot water storage tank side. An internal flow passage of the common pipe is divided into a hot water supply pipe (16) and a hot water return pipe (17) by a partition wall (15) continuous in the pipe axis direction. 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.
In addition, let 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) reach the inside of the hot water inlet (27) of the tap (3). Thus, when the tap (3) is closed, the hot water path is made to turn in the hot water inlet (27), so that the hot water always flows when the tap (3) is closed. Since the water is circulated to the inside of the hot water inlet (27), the hot water can be discharged at the same time as the hot water tap (3) is opened.
Furthermore, as the pipe joint (8) for joining each end of the hot water supply single pipe (4) and the return hot water single pipe (7) and the tip of the hot water supply / return water common pipe (10), the cylindrical portion (18) The branch portion (19) is formed in a T shape, the inside of the branch portion (19) is partitioned into a first flow passage (21) and a second flow passage (22), and the inside of the cylindrical portion (18) is By using the three flow passages (25a), the fourth flow passage (25b), and the fifth flow passage (26), a single hot water supply pipe (4) and a single hot water return pipe (7) are used. The hot water supply / return hot water common pipe (10) can be efficiently joined together and the hot water supply / return hot water common pipe (10) can be combined with the use of the hot water supply / return hot water common pipe (10). .

  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 recirculating hot water supply system of this type is configured to connect the tip of the return water single pipe (7) to the bypass pipe (6) branched from the water supply pipe (5), whereas the tip of the return hot water single pipe (7) The configuration similar to the configuration of the circulating hot water supply system according to the first aspect of the present invention is employed except that is connected to an intermediate portion of the hot water supply single pipe (4).

  The circulating hot water supply system according to claim 2 is, as described in claim 3, between the circulation pump (11) on the return hot water single pipe (7) and the connecting portion between the hot water single pipe (4). In addition, a reheating unit (31) using a heat exchanger, a heat pump, or the like can be provided.

  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 hot water single pipe and the joint of the hot water return / hot water common pipe can be performed. Since it is efficiently performed through the pipe joint, it is advantageous to simplify the construction of the hot water supply pipe, reduce the construction cost, and narrow the piping space. Moreover, since the hot water can be discharged immediately at the same time that the tap is opened, 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 and return hot water common 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 3 </ b> A, the second hot water tap 3 </ b> B, and the third hot water tap 3 </ b> C), the single hot water supply pipe 4 and the water supply pipe 5 connected to the hot water storage tank 2, and the water supply pipe 5 A single hot water return pipe 7 connected to the branched first bypass pipe 6, a single hot water supply pipe 4, a single hot water return pipe 7, and each hot water tap 3 are connected to each pipe joint 8 (in the illustrated example, the first and second hot water pipes 7 There are provided a hot water / return hot water common pipe 10 connected to hot water and return hot water, and a circulation pump 11 disposed in the single hot water return pipe 7 connected via pipe joints 8A, 8B).

  The hot water supply pipe 5 is piped between the lower part of the hot water storage tank 2 and the water supply, the hot water supply single pipe 4 is piped between the upper part of the hot water storage tank 2 and the first pipe joint 8A, and the single hot water return pipe 7 is A pipe is provided between the first bypass pipe 6 and the first pipe joint 8A. 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. The first bypass pipe 6 is provided with a second check valve 13 that prevents back flow of hot water into the return hot water single pipe 7.

  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 in a shape that has a circular cross-sectional shape. 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), the 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 that is inscribed in a part of the inner periphery of the shared pipe 10. .

  Each pipe joint 8 is formed in a T shape having a cylindrical portion 18 and a branching portion 19 branched from the cylindrical portion 18. The inside of the branch part 19 is partitioned into a first flow path 21 and a second flow path 22 by partitioning with a branch part partition wall 20. The inside of the cylindrical part 18 is partitioned by a first partition wall 23 that extends the branch part partition wall 20 and a second partition wall 24 that is continuous in the cylinder axis direction, thereby opening one end of the cylindrical part 18 from the first flow passage 21. A third flow passage 25 a that communicates with the second portion, a fourth flow passage 25 b that communicates from the second flow passage 22 to the other end opening of the cylindrical portion 18, and one end opening of the cylindrical portion 18 to the other end. A fifth flow passage 26 is formed so as to penetrate straight through the opening.

In the hot water supply circulation pipe, the end of the single hot water supply pipe 4 is connected to the first flow path 21 of the first pipe joint 8A, and the end of the single hot water return pipe 7 is connected to the second flow path 22 of the pipe joint 8A. The
The third and fifth flow passages 24 and 26 of the first pipe joint 8A and the hot water inlet of the first hot water tap 3A are connected by the first hot water supply / return water common pipe 10A. At that time, the tip of the hot water supply pipe 16 of the first hot water supply / return hot water common pipe 10A is the third flow passage 25a of the first pipe joint 8A, and the tip of the hot water return pipe 17 is the first pipe joint. Each is connected to the fifth flow passage 26 of 8A.
As shown in FIG. 4, each end of the hot water supply pipe 16 and the hot water return pipe 17 of the first hot water supply / return hot water common pipe 10A faces the inside of the hot water inlet 27 of the first hot water tap 3A. Thus, 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 hot water tap 3A is closed. The end of the hot water pipe 17 is turned to circulate to the inside of the hot water inlet 27.

  As shown in FIG. 1, the first pipe joint 8A, the second hot water tap 3B, and the third hot water tap 3C are connected to the second, third, and fourth hot water supply / return hot water via the second pipe joint 8B. It connects by common piping 10B, 10C, 10D. That is, the first pipe joint 8A and the second pipe joint 8B are connected by the second hot water supply / return water common pipe 10B. At this time, the fifth flow passage 26 of the first pipe joint 8A and the second The second flow passage 25b of the first pipe joint 8A and the second pipe joint are connected to the first flow path 21 of the second pipe joint 8B by the hot water supply pipe 16 of the second hot water supply / return water common pipe 10B. The second flow passage 22 of 8B is connected by the hot water return pipe line 17 of the second hot water supply / return hot water common pipe 10B.

  When connecting the second hot water tap 3B and the second pipe joint 8B, the tip of the hot water supply pipe 16 of the third hot water supply / return hot water common pipe 10C is connected to the third flow path of the second pipe joint 8B. 25a, the tip of the hot water return pipe 17 is connected to the fifth flow passage 26 of the second pipe joint 8B, and the hot water supply pipe 16 and the hot water pipe of the third hot water supply / return hot water common pipe 10C. Each end of the passage 17 is connected to the second hot water tap 3B so as to reach the inside of the hot water inlet 27 of the second hot water tap 3B, thereby the case of the first hot water tap 3A shown in FIG. Similarly, at the time of closing the second hot-water tap 3B, the hot water from the end of the hot water supply pipe 16 is always turned into the end of the hot water supply pipe 17 in the hot water inlet 27 and It circulates to the inside.

  When connecting the third hot water tap 3C and the second pipe joint 8B, the tip of the hot water supply pipe 16 of the fourth hot water supply / return water common pipe 10D is connected to the fifth flow path of the second pipe joint 8B. 26, the tip of the hot water return pipe 17 is connected to the fourth flow passage 25b of the second pipe joint 8B, and the hot water supply pipe 16 and the hot water pipe of the fourth hot water supply / return hot water common pipe 10D. Each end of the passage 17 is connected to the third hot-water tap 3C so as to face the inside of the hot-water inlet 27 of the third hot-water tap 3C, thereby the same as the case of the first hot-water tap 3A shown in FIG. In addition, when the third outlet tap 3C is closed, the hot water from the end of the hot water supply pipe 16 is always turned into the end of the hot water supply pipe 17 in the hot water inlet 27 and the inside of the hot water inlet 27. It is supposed to circulate until.

  In this way, the hot water supply pipe and the hot water return pipe are installed in the same place by piping the hot water supply / return hot water common pipes 10A to 10D in the hot water supply circulation pipe connecting the plurality of taps 3A, 3B, 3C. It can be piped at the same time, and by using the pipe joints 8A and 8B, the hot water single pipe 4 and the single hot water pipe 7 and the hot water / hot water common pipe 10 can be joined efficiently, and the workability is improved. Excellent.

A switching unit 29 such as a three-way valve for switching the direction of hot water flow is provided between the second bypass pipe 14 branched from the single hot water supply pipe 4 and the intermediate portion of the single hot water return pipe 7.
When all of the outlet taps 3A, 3B, 3C are in the closed state by the switching unit 29, as shown in FIG. 1, 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 first pipe. The first flow passage 21 of the joint 8A → the third flow passage 25a → the hot water supply pipe 16 of the first hot water supply / return hot water common pipe 10A → the hot water inlet 27 of the first hot water tap 3A → the first hot water supply The hot water return pipe 17 of the common hot water return pipe 10A → the fifth flow passage 26 of the first pipe joint 8A → the hot water feed pipe 16 of the second hot water supply / hot water common pipe 10B → the second pipe joint 8B First flow passage 21 → third flow passage 25a → third hot water supply / return water common pipe 10C hot water supply pipe 16 → second hot water inlet 3B hot water inlet 27 → third hot water supply / return The hot water return pipe 17 of the hot water common pipe 10C → the fifth flow passage 26 of the second pipe joint 8B → the hot water supply pipe 16 of the fourth hot water supply / return hot water common pipe 10D → the third outlet tap 3C Inlet 27 → Hot water return pipe 17 of fourth hot water supply / return hot water common pipe 10D → 4th and 2nd flow passages 25b, 22 of second pipe joint 8B → Second hot water supply / return hot water common pipe 10B Hot water return pipe 17 → fourth and second flow passages 25b, 22 of first pipe joint 8A → hot water single pipe 7 → circulation pump 11 → first bypass pipe 6 → second check valve 13 → water supply pipe 5 is switched to return to the hot water storage tank 2.

  Then, the third hot water supply / return hot water facing the inlet 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 10C is discharged, hot water is returned from the single hot water supply pipe 4 via the second bypass pipe 14 as shown in FIG. It flows also in the single pipe 7, and the second and fourth flow passages 22, 25b of the first pipe joint 8A → the hot water return pipe line 17 of the second hot water supply / hot water common pipe 10B → the second pipe joint 8B. 2 and 4 flow passages 22, 25b → return water pipe 17 of the fourth hot water supply / return hot water common pipe 10D → hot water inlet 27 of the third hot water tap 3C → fourth hot water supply / return hot water common pipe 10D Hot water supply pipe 16 → the fifth flow passage 26 of the second pipe joint 8B → the hot water return pipe 17 of the third hot water supply / return water common pipe 10C → the second hot tap It is to flow into the inlet 27 of the B. 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 third hot water supply / return hot water common pipe 10C by the switching of 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 a low speed or intermittently to return to the second bypass pipe 14 and return. The three-way valve as the switching unit 29 is switched so that the communication state with the hot water single pipe 7 is blocked. Thereby, the hot water storage tank 2 → the first check valve 12 → the single hot water supply pipe 4 → the first flow passage 21 of the first pipe joint 8B → the third flow passage 25a → the first hot water supply / return water common pipe 10A. Hot water supply pipe 16 → hot water inlet 27 of the first hot water tap 3A → hot water return pipe 17 of the first hot water supply / return water common pipe 10A → fifth flow path 26 of the first pipe joint 8A → The hot water supply pipe 16B of the second hot water supply / return water common pipe 10B → the first flow passage 21 of the second pipe joint 8B → the third flow path 25a → the supply of the third hot water supply / return water common pipe 10C. Hot water pipe 16 → Hot water inlet 27 of the second tap tap 3B → Hot water pipe 17 of the third hot water supply / return water common pipe 10C → Fifth flow path 26 of the second pipe joint 8B → Fourth Hot water supply / return hot water common pipe 10D hot water supply line 16 → Third outlet tap 3C hot water inlet 27 → 4th hot water supply / return hot water common pipe 10D hot water return pipe 17 → second pipe Of joint 8B 4 and 2 flow passages 25b, 22 → second hot water return pipe 17B of the second hot water supply / return hot water common pipe 10B → fourth and second flow passages 25b and 22 of the first pipe joint 8A → a single hot water return pipe 7 → Flow from the circulation pump 11 to the first bypass pipe 6 to the second check valve 13 to the water supply pipe 5 to return to the hot water storage tank 2 and from the hot water storage tank 2 through the first check valve 12 to the same order as described above. , Repeat it and circulate.
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 The three-way valve, which is the switching unit 29, is switched so that hot water flows from the second bypass pipe 14 to the return hot water single pipe 7 as shown in FIG. At this time, the operation of the circulation pump 11 is stopped. When the second hot-water tap 3B is opened, the third hot water supply / return water facing the inlet 27 of the second hot-water tap 3B due to the internal pressure (tap pressure) in the hot water storage tank 2 is reached. Hot water from the hot water supply pipe 16 of the common pipe 10C is immediately discharged, and at the same time, hot water is returned from the single hot water supply pipe 4 via the second bypass pipe 14 along with the switching of the three-way valve as the switching unit 29. It flows also in the single pipe 7, and the second and fourth flow passages 22, 25b of the first pipe joint 8A → the hot water return pipe line 17 of the second hot water supply / hot water common pipe 10B → the second pipe joint 8B. 2 and 4 flow passages 22, 25b → return water pipe 17 of the fourth hot water supply / return hot water common pipe 10D → hot water inlet 27 of the third hot water tap 3C → fourth hot water supply / return hot water common pipe 10D Hot water supply pipe 16 → the fifth flow passage 26 of the second pipe joint 8B → the hot water return pipe 17 of the third hot water supply / return water common pipe 10C → the second hot water tap 3 It flows into the inlet 27 and discharges with hot water from Okuyu conduit 16 of the third Okuyu-Kaeyu shared pipe 10C.
As described above, when the second hot-water tap 3B is opened, hot water is discharged immediately, so that no waste water is generated. Further, the second hot-water tap 3B that is opened by switching the three-way valve that is the switching unit 29 is supplied from both the hot water supply pipe 16 and the hot water supply pipe 17 of the third hot water supply / return hot water common pipe 10C. Since hot water is sent, it is possible to reduce a decrease in the discharge flow rate from the second hot water tap 3B.

  FIG. 5 shows a configuration of a circulating hot water supply system 1 according to another embodiment. In this embodiment, the circulating hot water supply system 1 of the above embodiment returns the return hot water to the lower part in the hot water storage tank 2 by connecting the tip of the return hot water single pipe 7 to the water supply pipe 5 via the first bypass pipe 6. On the other hand, the point which connected the front-end | tip of the return hot water single piping 7 to the middle part of the hot water supply single piping 4 differs from the said Example. In this case, a reheating part 31 such as a heat exchanger or a heat pump is provided between the circulating pump 11 on the return hot water single pipe 7 and the connection part of the hot water supply single pipe 4 to reheat the return hot water. Then, it is circulated back to the hot water supply single pipe 4 through the check valve 32. Since the other structure is the same as that of the circulating hot water supply system 1 of the above embodiment, the same elements and the same reference numerals are assigned to the same members, and the duplicate description thereof is omitted.

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 of the circulation type hot-water supply system which shows another Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Circulation type hot water supply system 2 Hot water storage tank 3 (3A, 3B, 3C) Hot tap 8 (8A, 8B) Pipe joint 10 (10A, 10B, 10C) Hot water supply / return hot water common piping 11 Circulation pump 15 Partition wall 16 Feed Hot water pipe line 17 Return hot water pipe line 18 Cylindrical part 19 Branch part 20 Branch part partition wall 21 First flow path 22 Second flow path 23 First partition wall 24 Second partition wall 25a Third flow path 25b Fourth flow path 26 5th passage 27 Hot water inlet 31 Reheating part

Claims (3)

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 return hot water connected at the tip to a bypass pipe branched from the water supply pipe Single pipe, hot water supply / return hot water common pipe for connecting each end of the hot water supply single pipe and return hot water single pipe and the hot water tap through a pipe joint, and circulation provided in the single hot water return pipe And a pump for
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 pipe joint is formed in a T shape having a cylindrical portion and a branch portion branched from the cylindrical portion, and the inside of the branch portion is partitioned into a first flow passage and a second flow passage by partitioning with a branch portion partition wall. The inside of the cylindrical part is formed by partitioning with a first partition wall extending the branch part partition wall and a second partition wall continuing in the cylinder axis direction, so that one end of the cylindrical part is formed from the first flow passage. A third flow passage communicating to the opening, a fourth flow passage communicating from the second flow passage to the other end opening of the cylindrical portion, and the other end opening from the one end opening of the cylindrical portion. A section is formed in the fifth flow passage that penetrates the part,
The end of the hot water single pipe is connected to the first flow path of the pipe joint, and the end of the return hot water single pipe is connected to the second flow path of the pipe joint,
The tip of the hot water supply pipe of the hot water supply / return hot water common pipe is connected to the third flow passage of the pipe joint, and the tip of the hot water return pipe is connected to the fifth flow passage of the pipe joint,
The end of the hot water supply / return hot water common pipe is connected to the hot water tap so that both the end of the hot water supply pipe and the end of the hot water return pipe 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 Single pipe, hot water supply / return hot water common pipe for connecting each end of the hot water supply single pipe and return hot water single pipe and the hot water tap through a pipe joint, and circulation provided in the single hot water return pipe And a pump for
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 pipe joint is formed in a T shape having a cylindrical portion and a branch portion branched from the cylindrical portion, and the inside of the branch portion is partitioned into a first flow passage and a second flow passage by partitioning with a branch portion partition wall. The inside of the cylindrical part is formed by partitioning with a first partition wall extending the branch part partition wall and a second partition wall continuing in the cylinder axis direction, so that one end of the cylindrical part is formed from the first flow passage. A third flow passage communicating to the opening, a fourth flow passage communicating from the second flow passage to the other end opening of the cylindrical portion, and the other end opening from the one end opening of the cylindrical portion. A section is formed in the fifth flow passage that penetrates the part,
The end of the hot water single pipe is connected to the first flow path of the pipe joint, and the end of the return hot water single pipe is connected to the second flow path of the pipe joint,
The tip of the hot water supply pipe of the hot water supply / return hot water common pipe is connected to the third flow passage of the pipe joint, and the tip of the hot water return pipe is connected to the fifth flow passage of the pipe joint,
The end of the hot water supply / return hot water common pipe is connected to the hot water tap so that both the end of the hot water supply pipe and the end of the hot water return pipe 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 system according to claim 2, wherein a reheating unit such as a heat exchanger or a heat pump is provided between the circulation pump on the return hot water single pipe and a connection portion between the hot water supply single pipe. .

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