JP2017116222A - Hot water supply system - Google Patents

Abstract

[PROBLEMS] To improve workability and versatility and reduce management costs in a hot water supply system that circulates hot water into a facility.
A hot water supply system (1) includes a hot water heater (2), a circulation device (6), an expansion tank (7), a main water supply pipe (3A), a main hot water supply pipe (3B), a return main pipe (4), and a gantry (8). The circulation device 6 includes a water flow pipe 63 that constitutes a part of the hot water circulation path, and a circulation pump 65 that distributes the hot water in the water flow pipe 63 from the hot water introduction port 62 side to the hot water discharge port 61 side. The unit is configured as a single unit including at least a pressure relief valve 64 that suppresses an excessive increase in pressure in the circulation path, and the water heater 2 is assembled to the upper part of the gantry 8, and the circulation device is provided below the water heater 8 in the gantry 8. 6. It shall be comprised by assembling the expansion tank 7, the main pipe 3A for water supply, the main pipe 3B for hot water supply, and the return main pipe 4.
[Selection] Figure 1

Description

  The present invention relates to a hot water supply system, and more particularly to a hot water supply system that quickly supplies hot water to a hot water supply pipe in a facility.

  In large-scale facilities such as hotels and general hospitals, a so-called instant hot water supply system that circulates and supplies hot water to the hot water supply piping in the facility so that hot water at a desired temperature can be quickly supplied to the hot water use destination as required. Is widely used. Conventionally, this type of hot water supply system has been proposed in which components such as a water heater, a circulation pump, an expansion tank, and hot water piping are assembled into a single frame to form a single hot water supply unit (for example, Patent Document 1). And 2).

JP 2006-138491 A JP 2004-44973 A

  However, in the conventional hot water supply system, since it is necessary to carry in / out and install in units of heavy hot water supply units, a heavy load is imposed on the operator. In addition, since crane equipment is required for carrying in and installing the hot water supply unit, the installation location is also limited.

  Moreover, when the scale of the facility is large, it is configured to circulate and supply hot water using a plurality of hot water heaters. However, in the conventional hot water supply system, a circulation system is provided separately from a hot water supply unit including a circulation pump and an expansion tank. Since it is necessary to manufacture and store a hot water supply unit that does not include a pump or an expansion tank, the management cost may increase accordingly. In addition, when installing a plurality of these hot water supply units side by side, it takes time to connect the hot water pipes of adjacent hot water supply units.

  The present invention has been made in view of the above problems, and its purpose is to improve workability and versatility in a hot water supply system that circulates and supplies hot water to hot water supply pipes in a facility, and to reduce management costs. There is to plan.

  The present invention absorbs a hot water heater that heats hot water to a predetermined temperature, a circulation device that circulates hot water in a circulation path constructed between a hot water supply pipe and a water heater, and volume expansion of the hot water in the circulation path. An expansion tank, a water supply main pipe for introducing water from the water supply pipe to the water heater, a hot water supply main pipe for introducing hot water from the water heater to the hot water supply pipe, and a return main pipe for guiding hot water from the hot water supply pipe to the circulation device, A hot water supply system including these water heaters, a circulation device, an expansion tank, a water supply main pipe, a hot water supply main pipe and a return main pipe, and the circulation device constitutes a part of the circulation path. A single pipe provided with at least a water pipe, a circulation pump for circulating hot water in the water pipe from the hot water inlet side to the hot water outlet side, and a pressure relief valve that suppresses an excessive pressure rise in the circulation path Configured as a unit Assembling a water heater in the upper part of the gantry, the circulating device below the water heater in the pedestal, the expansion tank, water supply main pipe and is formed by assembling the main pipe and the return main piping hot water.

  In this device, at least the water flow pipe, the circulation pump, and the pressure relief valve are formed as a single unit as the circulation device, and are configured separately from the expansion tank. The circulation device and the expansion tank are separated from the water heater. Therefore, the heavy load on the operator can be reduced. Moreover, since no crane equipment is required for carrying-in work and installation work, it is difficult to receive restrictions on the installation location. Moreover, in this case, the arrangement of the circulation device and the expansion tank can be set separately according to the position and size of the space provided below the water heater, so that the entire hot water system can be configured in a compact manner. it can. Therefore, it is more difficult to receive restrictions on the installation location.

  Further, in this case, when installing a plurality of water heaters, the circulation device, the expansion tank, each main pipe, the return pipe, etc. can be retrofitted to the base on which the water heater is assembled. Unlike the hot water supply system, it is not necessary to separately assemble and store the hot water supply unit including the circulation pump and the expansion tank and the hot water supply unit not including the circulation pump and the expansion tank.

  Preferably, in the hot water supply system, each of the main water supply pipe and the main hot water supply pipe has a common hot water pipe connection and a forward pipe connection, and a hot water circulation path is constructed between the hot water supply and the hot water supply pipe. In order to do this, the water inlet of the water heater and the pipe connection for the water heater of the main water supply pipe are connected by a water inlet pipe, and the hot water outlet of the water heater and the pipe connection for the water heater of the main pipe for hot water supply are connected by a hot water pipe. The main pipe for hot water supply is sealed with a stop cock, the hot water outlet of the circulation device and the forward pipe connection of the main pipe for water supply are connected by the forward pipe, and the hot water inlet of the circulation device The inner pipe connection portion of the return main pipe is connected by the return pipe.

  In this case, since a common pipe can be used for the water supply main pipe and the hot water supply main pipe, it is not necessary to separately assemble and store the water supply main pipe and the hot water supply main pipe separately.

  In addition, when constructing only the hot water supply route from the water heater to the hot water usage destination without constructing the above circulation route, the water inlet of the water heater and the pipe connection portion for the water heater of the main water supply pipe are connected by a water inlet pipe, Connect the hot water outlet of the water heater to the hot water supply pipe connection of the main hot water supply pipe with a hot water discharge pipe, and then seal each forward pipe connection of the main water supply pipe and the main hot water supply pipe with a water stop cock. Therefore, there is no need to carry the circulation device, the expansion tank, and the return main pipe to the construction site, or to assemble them to the frame.

  Preferably, in the hot water supply system, the circulation device and the expansion tank are arranged in the front-rear direction with respect to the front-rear direction of the water heater.

  In this case, especially when only one water heater is installed or when two water heaters are installed back and forth with the rear surface aligned, the width of the hot water system can be set small. More difficult to limit.

  As described above, according to the present invention, since the heavy load on the operator can be reduced, workability is improved. In addition, versatility is improved because it is difficult to limit the installation location. Furthermore, unlike the conventional hot water supply system described above, it is not necessary to separately assemble and store a hot water supply unit having a circulation pump and a hot water supply unit not having a circulation pump, thereby reducing management costs. Is also possible.

FIG. 1 is a schematic configuration diagram of a hot water supply system according to an embodiment of the present invention. FIG. 2 is a schematic front view showing a first configuration of the hot water supply system according to the embodiment of the present invention. FIG. 3 is a schematic left side view showing the first configuration of the hot water supply system according to the embodiment of the present invention. FIG. 4 is a schematic front view showing a second configuration of the hot water supply system according to the embodiment of the present invention. FIG. 5 is a schematic front view showing a third configuration of the hot water supply system according to the embodiment of the present invention. FIG. 6 is a schematic left side view showing a third configuration of the hot water supply system according to the embodiment of the present invention. FIG. 7 is a schematic front view showing a fourth configuration of the hot water supply system according to the embodiment of the present invention.

  Next, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 1, the hot water supply system 1 according to the embodiment of the present invention heats water introduced from an external water supply pipe L1 to a predetermined temperature, and leads out to the hot water supply pipe L2 in the target facility. , A circulation device 6 that circulates hot water in a circulation path constructed between the hot water supply pipe L2 and the water heater 2, and an expansion tank that absorbs the volume expansion of hot water during heating in the circulation path 7, main water supply pipe 3 </ b> A connecting water supply pipe L <b> 1 and water heater 2, main water supply pipe 3 </ b> B connecting hot water supply pipe L <b> 2 and water heater 2, and return main pipe connecting hot water supply pipe L <b> 2 and circulation device 6. 4, a gas main pipe 5 connecting the external gas pipe L3 and the water heater 2, a water heater 2, a water supply main pipe 3A, a hot water main pipe 3B, a gas main pipe 5, a circulation device 6, an expansion tank 7, etc. It is comprised with the mount frame 8 which mounts and supports. A hot water usage destination P such as a currant or shower provided in the target facility branches off from the hot water supply pipe L2.

  The water heater 2 has a vertically long, substantially rectangular parallelepiped outer case (a water heater body case) 20, and a water inlet 21 serving as a connection portion of a water inlet pipe 11 for introducing hot water into the water heater 2 on the lower surface thereof. And a hot water outlet 22 serving as a connecting portion of a hot water outlet pipe 12 through which hot water is led out from the hot water heater 2 and a gas inlet 25 serving as a connecting portion of a gas introduction pipe 15 for introducing gas into the hot water heater 2 are provided.

  Inside the water heater main body case 20, the fuel gas supplied through the gas introduction pipe 15 is combusted to generate combustion exhaust gas, and the hot water introduced through the water intake pipe 11 is heat-exchanged and heated by the combustion exhaust gas. A heat exchanger 24 that leads out to the hot water discharge pipe 12 is incorporated. The gas introduction part of the burner 23 is connected to the gas inlet 25 through an internal pipe. Moreover, the incoming header of the heat exchanger 24 is connected to the water inlet 21 via an internal pipe, and the outgoing hot water header of the heat exchanger 24 is connected to the hot water outlet 22 via an internal pipe.

  Although not shown, the water heater main body case 20 has a point-extinguishing control for igniting and extinguishing the burner 23 based on the amount of water passing through the heat exchanger 24, and a hot water temperature from the heat exchanger 24. A control circuit for controlling the hot water discharge operation of the water heater 2 such as combustion control for adjusting the combustion amount of the burner 23 is incorporated.

  As shown in FIGS. 1 and 2, the main water supply pipe 3A and the hot water main pipe 3B are closed at one end, and have hot water pipe connection portions 31 and 32 to which the water supply pipe L1 and the hot water supply pipe L2 can be connected at the other end. It is a substantially straight tubular body having the same piping configuration. That is, the water supply main pipe 3A and the hot water supply main pipe 3B are common to each other, and the water supply pipe L1 is connected to the hot water pipe connection part (water supply pipe connection part) 31 on the water supply main pipe 3A side. The hot water supply pipe L2 is connected to the hot water pipe connection part (hot water supply pipe connection part) 32 on the main pipe 3B side.

  A hot water supply pipe connecting portion 33 to which the incoming water pipe 11 and the hot water outlet pipe 12 can be connected is provided on the outer periphery of each of the main water supply pipe 3A and the hot water supply main pipe 3B. The upstream end of the water inlet pipe 11 is connected to the pipe connecting part 33 (water inlet pipe connecting part 33a), and the downstream end of the hot water pipe 12 is connected to the water heater pipe connecting part 33 (outlet hot water pipe connecting part 33b) on the hot water supply main pipe 3B side. Connected. The downstream end of the water inlet pipe 11 is connected to the water inlet 21 of the water heater 2, and the upstream end of the hot water outlet pipe 12 is connected to the hot water outlet 22 of the water heater 2.

  In this way, the main water supply pipe 3A connects the water heater 2 and the water supply pipe L1 via the water inlet pipe 11, and the hot water main pipe 3B is connected to the water heater 2 and the hot water supply pipe L2 via the outlet pipe 12. Are connected. When a plurality of water heaters 2 are installed, the water supply main pipe 3A and the hot water supply main pipe 3B having the same number of water inlet pipe connection portions 33a or hot water pipe connection portions 33b as the number of water heaters 2 installed are provided. Used.

  In addition, an outer pipe connecting portion 36 to which an outgoing pipe 13 for extracting hot water from the circulation device 6 can be connected is provided on the outer periphery of each of the main water supply pipe 3A and the hot water supply main pipe 3B. The downstream end of the forward pipe 13 is connected to the pipe joint connected to the forward pipe connecting part 36 on the 3A side. On the other hand, since the outgoing pipe connection part 36 on the hot water supply main pipe 3B side is not used, it is sealed with a water stop cock 37.

  The return main pipe 4 has an outer pipe connection part 41 to which the hot water supply pipe L2 can be connected at one end and an inner pipe connection part 42 to which the return pipe 14 for introducing hot water into the circulation device 6 can be connected to the other end. A hot water pipe L2 is connected to the outer pipe connecting portion 41, and the upstream end of the pipe 14 is connected to the inner pipe connecting portion 42.

  The gas main pipe 5 is a substantially straight tubular body having a gas pipe connection part 51 that can connect the gas pipe L3 at one end and a gas introduction pipe connection part 52 that can connect the gas introduction pipe 15 to the other end. Yes, the gas pipe L3 is connected to the gas pipe connecting part 51 on one end side, and the upstream end of the gas introducing pipe 15 is connected to the gas inlet pipe connecting part 52 on the other end side. The downstream end of the gas introduction pipe 15 is connected to the gas inlet 25 of the water heater 2.

  Thus, the gas main pipe 5 connects the water heater 2 and the gas pipe L3 through the gas introduction pipe 15. In the case where a plurality of water heaters 2 are installed, one or a plurality of gases are further provided in the middle of the outer periphery of the gas main pipe 5 so that the number of gas introduction pipe connection portions 52 matches the number of installed water heaters 2. The gas main pipe 5 provided with the introduction pipe connection part 52 is used.

  As shown in FIG. 1, the circulation device 6 includes a water flow pipe 63 that constitutes a part of the circulation path, and a circulation pipe 63 that forms a part of the circulation path, in a single vertically long rectangular parallelepiped casing (circulation device body case) 60. A pressure relief valve 64 that suppresses excessive pressure rise, a circulation pump 65 that circulates hot water in the water flow pipe 63 from the hot water inlet 62 to the hot water outlet 61, and a back flow of hot water in the water pipe 63 are prevented. A backflow prevention valve 66 and an air / water separator 67 that separates and collects air from hot water flowing through the water flow pipe 63 are incorporated, and configured as a single unit.

  Further, an air vent valve 68 connected to the inside of the steam / water separator 67 and for releasing the air collected in the steam / water separator 67 to the outside is connected to the upper part of the circulation device main body case 60. Further, although not shown, a circulating water temperature sensor for detecting the temperature of hot water in the water flow pipe 63 is provided inside the steam / water separator 67. In addition, a circulating water amount sensor that detects the amount of water flow in the water flow pipe 63 is provided on the downstream side of the steam / water separator 67 in the water flow pipe 63.

  The hot water outlet 61 and the hot water inlet 62 are provided on one side surface (here, the left side) of the circulation device main body case 60, and the water flow pipe 63 includes the hot water outlet 61 and the hot water inlet 62. It constitutes a hot water conduction path that connects each other. The upstream end of the forward pipe 13 is connected to the hot water outlet 61, and the downstream end of the return pipe 14 is connected to the hot water inlet 62. As described above, the circulation device 6 is connected between the return main pipe 4 and the water supply main pipe 3 </ b> A via the forward pipe 13 and the return pipe 14.

  The pressure relief valve 64, the circulation pump 65, the backflow prevention valve 66, and the steam / water separator 67 are arranged in this order from the upstream side with respect to the water flow pipe 63. In addition, a plurality (here, two) of parallel pipe lines 630 are provided in the middle portion of the water flow pipe 63, and the circulation pump 65 and the backflow prevention valve 66 are provided in each of the parallel pipe lines 630. ing. The pressure relief valve 64 is provided on the upstream side of the branch point S1 to the parallel pipe line 630 in the water flow pipe 63, and the steam / water separator 67 is on the downstream side of the junction S2 of the parallel pipe line 630 in the water flow pipe 63. Is provided.

  The expansion tank 7 is a sealed can body formed in a vertically long substantially cylindrical shape, and a substantially T-shaped branch pipe 71 branched and connected to an intermediate portion of the return pipe 14 is provided at the bottom thereof. . That is, the expansion tank 7 is disposed in a hot water return path that connects the hot water supply pipe L <b> 2 and the hot water inlet 62 of the circulation device 6.

  As described above, the water inlet 21 of the water heater 2 and the inlet pipe connecting portion 33a of the main water supply pipe 3A are connected by the inlet pipe 11, and the hot water outlet 22 of the water heater 2 and the hot water outlet of the hot water main pipe 3B are connected. The hot water outlet 61 of the circulation device 6 and the outgoing piping connection portion 36 of the main water supply piping 3A are connected by the outgoing piping 13 and the hot water of the circulating device 6 is connected. The introduction port 62 and the inner pipe connection part 42 of the return main pipe 4 are connected by the return pipe 14, and the forward pipe connection part 36 of the hot water supply main pipe 3 </ b> B is sealed with a water stopcock 37, A hot water circulation path is constructed between the hot water supply pipe L2 and the hot water heater 2 by connecting the hot water supply pipe L2 to the 3B hot water supply pipe connection section 32 and the outer pipe connection section 41 of the return main pipe 4.

  In addition, when not constructing the said circulation path | route, but constructing | assembling only the hot water supply path | route from the hot water heater 2 to the hot water utilization destination P, it does not assemble the return main piping 4, the circulation apparatus 6, and the expansion tank 7 in the mount frame 8, but hot water supply The water inlet 21 of the water heater 2 and the water inlet pipe connecting portion 33a of the main water supply pipe 3A are connected by the water inlet pipe 11, and the hot water outlet 22 of the water heater 2 and the hot water outlet pipe connecting portion 33b of the main pipe 3B for hot water supply are connected. The hot water supply pipe L2 is connected to the hot water supply pipe 12 and further connected to the hot water supply pipe connection portion 32 of the hot water supply main pipe 3B. Further, in this case, since the forward pipe connecting portions 36 of the water supply main pipe 3A and the hot water supply main pipe 3B are not used, both are sealed by the water stop cock 37.

  As shown in FIGS. 2 and 3, the gantry 8 is a frame formed of a metal elongated plate material, and the substantially rectangular support frame 80 and the lower frame 81 are formed in a substantially inverted T shape when viewed from the side. It is configured in combination.

  The height dimension of the support frame 80 is set to approximately twice the vertical height dimension of the water heater body case 20, and the water heater 2 is assembled and fixed in the upper half of the front side of the support frame 80. A main water supply pipe 3A, a hot water supply main pipe 3B, a return main pipe 4, a gas main pipe 5, a circulation device 6 and an expansion tank 7 are assembled in a substantially lower half area of the front side of 80, that is, in a space below the water heater 2. Fixed. In the present specification, the depth direction when the water heater 2 is viewed from the front surface 201 side of the water heater body case 20 is referred to as the front-rear direction, the width direction is referred to as the left-right direction, and the height direction is referred to as the up-down direction.

  A decorative panel 83 is attached from the front upper edge of the lower frame 81 along the left and right upper edges in a substantially lower half area on the front side of the support frame 80. By enclosing the space below the water heater 2 with the decorative panel 83 in this way, it is possible to prevent the pipes, the circulation device 6 and the expansion tank 7 from being directly exposed to wind and rain, and the entire hot water system 1. It also contributes to the improvement of the aesthetics.

  Each of the main pipes for water supply main pipe 3A, hot water supply main pipe 3B, return main pipe 4 and gas main pipe 5 is substantially horizontal in the left-right direction along the front side of the support frame 80 and is vertically They are arranged side by side with a space in between. The water supply main pipe 3A is arranged adjacent to the lower side of the return main pipe 4, the gas main pipe 5 is arranged adjacent to the lower side of the water supply main pipe 3A, and the hot water supply main pipe 3B is The gas main pipe 5 is disposed adjacent to the lower side. The main pipes may be arranged in a different order from the above arrangement unless there is a risk that the assembly workability will be significantly impaired or the hot water supply performance will deteriorate due to the complicated circulation path. It may be arranged along the rear surface side of the support frame 80, or may be divided and arranged on the front surface side and the rear surface side of the support frame 80.

  The water inlet pipe connecting part 33a, the hot water pipe connecting part 33b, the outgoing pipe connecting part 36, and the gas introduction pipe connecting part 52 are all projected upward from the outer peripheral part of each pipe. Further, the water inlet pipe connecting portion 33 a, the hot water outlet pipe connecting portion 33 b and the gas introduction pipe connecting portion 52 are positioned near the left side 202 of the water heater main body case 20 in the space below the water heater 2, that is, below the water heater 2. It is provided on the left side. The forward piping connection portion 36 is provided at a position near the left side 802 of the support frame 80, that is, at a position near the lower left side of the water heater 2. Thus, by providing each pipe connection part, such as the inlet pipe connection part 33a, the hot water pipe connection part 33b, the outgoing pipe connection part 36, and the gas introduction pipe connection part 52, at a position closer to the lower side of the water heater 2. A space in which the circulation device 6 and the expansion tank 7 can be arranged is secured at a position near the lower other side of the water heater 2.

  The width dimension of the support frame 80 is set according to the number of water heaters 2 installed. The hot water supply system 1 shown in FIG. 2 has two hot water heaters 2 installed side by side, and the width dimension of the support frame 80 is set to approximately twice the horizontal width dimension of the water heater main body case 20. In this case, the water supply main pipe 3 </ b> A and the hot water supply main pipe 3 </ b> B are both provided with a two-way water heater pipe connection portion 33, and the gas main pipe 5 has two-way gas introduction. What is provided with the pipe connection part 52 is used.

  Furthermore, in this case, the circulation device 6 is assembled and fixed in a space below one (here, the right side) water heater 2, and the expansion tank 7 is a space below the other (here, the left side) water heater 2. The main pipes for water supply main pipe 3A, hot water supply main pipe 3B, return main pipe 4 and gas main pipe 5 are assembled and fixed in the space behind the circulation device 6 and the expansion tank 7. Note that the circulation device 6 and the expansion tank 7 may be disposed at opposite positions as long as there is no fear that the assembling workability is significantly impaired or the hot water supply performance is lowered due to the complicated circulation path. Alternatively, the circulation device 6 and the expansion tank 7 may be disposed before and after the support frame 80 as in the case where only one hot water heater 2 described later is installed.

  As shown in FIG. 4, when three water heaters 2 are installed side by side, the width dimension of the support frame 80 is set to approximately three times the left and right width dimension of the water heater body case 20. In this case, the water supply main pipe 3A and the hot water supply main pipe 3B are both provided with a three-way water heater pipe connection portion 33, and the gas main pipe 5 is connected to a three-mouth gas introduction pipe. What is provided with the part 52 is used.

  Further, in this case, the circulation device 6 is assembled and fixed in a space below any one (here, the center) of the water heaters 2, and the expansion tank 7 is connected to the other (here, the left side) of the water heater 2. It is assembled and fixed in the lower space. Note that the circulation device 6 and the expansion tank 7 may be disposed at opposite positions as long as there is no fear that the assembling workability is significantly impaired or the hot water supply performance is lowered due to the complicated circulation path. Alternatively, it may be disposed below the left and right water heaters 2, that is, at positions separated from each other on the left and right. Further, the circulation device 6 and the expansion tank 7 may be disposed before and after the support frame 80 as in the case where only one hot water heater 2 described later is installed.

  As shown in FIGS. 5 and 6, when only one hot water heater 2 is installed, the width dimension of the support frame 80 is set to be substantially the same as the left and right width dimension of the water heater body case 20. In this case, the water supply main pipe 3A and the hot water supply main pipe 3B are both provided with a single water heater pipe connection portion 33, and the gas main pipe 5 is connected to a single gas inlet pipe. What is provided with the part 52 is used. When only one water heater 2 is installed, the hot water supply pipe L2 is directly connected to the hot water outlet 22 of the water heater 2 without assembling the hot water main pipe 3B and the gas main pipe 5 to the mount 8, and the water heater The gas pipe L3 may be directly connected to the two gas inlets 25. Thereby, the number of parts of the whole hot-water supply system 1 can be reduced, and the number of work steps during construction can also be reduced.

  In this case, the circulation device 6 is assembled and fixed in a space below the water heater 2 on the front surface side of the support frame 80, and the expansion tank 7 is assembled and fixed below the water heater 2 on the rear surface side of the support frame 80. The Note that the circulation device 6 and the expansion tank 7 may be disposed at opposite positions as long as there is no fear that the assembling workability is significantly impaired or the hot water supply performance is lowered due to the complicated circulation path. Good. If there is sufficient space below the water heater 2 on the front side of the support frame 80, both the circulation device 6 and the expansion tank 7 are arranged below the water heater 2 on the front side of the support frame 80. Also good. In the hot water supply system 1 shown in FIG. 6, the decorative panel 83 is provided only in the substantially lower half area on the front surface side of the support frame 80, but also around the expansion tank 76 in the substantially lower half area on the rear surface side of the support frame 80. A decorative panel 83 may be provided.

  As shown in FIG. 7, when two water heaters 2 are installed in a back-and-forth back-and-forth state, the width dimension of the support frame 80 is set to be approximately the same as the left and right width dimension of the water heater body case 20, and The hot water heaters 2 are assembled and fixed in substantially upper half regions on the front side and the rear side of the frame 80, respectively. In this case, the water supply main pipe 3 </ b> A and the hot water supply main pipe 3 </ b> B are both provided with a two-way water heater pipe connection portion 33, and the gas main pipe 5 has two-way gas introduction. What is provided with the pipe connection part 52 is used.

  Further, in this case, the main pipes for water supply main pipe 3A, hot water supply main pipe 3B, return main pipe 4 and gas main pipe 5 are assembled and fixed to the front side or rear side of the support frame 80, and the circulation device 6 and The expansion tank 7 is assembled and fixed in a space below different hot water heaters 2.

  Although not shown in the drawings, when the four water heaters 2 are installed side by side in the horizontal direction and the front and rear are respectively aligned in the rear surface, the width dimension of the support frame 80 is approximately twice the horizontal width dimension of the water heater body case 20. When the six hot water heaters 2 are installed side by side in a side-by-side configuration and the front and rear are aligned to the rear, the width of the support frame 80 is approximately three times the horizontal width of the water heater body case 20. Set to In these cases, the water supply main pipe 3A and the hot water supply main pipe 3B are both provided with the hot water supply pipe connection portions 33 for the number of the water heaters 2, and the gas main pipe 5 has The thing provided with the gas introduction pipe connection parts 52 for the number of the hot water heaters 2 is used.

  Further, in these cases, the main pipes for water supply main pipe 3A, hot water supply main pipe 3B, return main pipe 4 and gas main pipe 5 are assembled and fixed to the front side or rear side of the support frame 80, and the circulation device 6 The expansion tank 7 is assembled and fixed in a space below one of the water heaters 2 (for example, the front side). Note that the circulation device 6 and the expansion tank 7 are provided on the front side and the rear side of the support frame 80 unless there is a risk that the assembly workability is significantly impaired or the hot water supply performance is lowered due to the complicated circulation path. They may be arranged separately.

  Thus, according to the hot water supply system 1 according to the above embodiment, the water flow pipe 63, the pressure relief valve 64, the circulation pump 65, the backflow prevention valve 66, and the steam / water are provided in one housing (circulation device body case) 60. A separator 67 is incorporated to constitute a single unit as the circulation device 6 and is constructed separately from the expansion tank 7. The circulation device 6 and the expansion tank 7 are separated from the water heater 2 at the construction site. Since it can be carried in, the heavy load on the operator is small. Therefore, workability is good. Moreover, since no crane equipment is required for carrying-in work and installation work, it is difficult to receive restrictions on the installation location. Therefore, versatility is also good.

  Furthermore, in this case, when installing a plurality of water heaters 2, the circulation device 6 and the expansion tank 7 can be retrofitted at the construction site to the mount 8 on which the water heaters 2 are assembled. Unlike the conventional hot water supply system, it is not necessary to separately assemble and store a hot water supply unit having a circulation pump and an expansion tank and a hot water supply unit not having a circulation pump and an expansion tank. In this case, since a common pipe is used for the water supply main pipe 3A and the hot water supply main pipe 3B, the water supply main pipe 3A and the hot water supply main pipe 3B need to be separately assembled and stored. Nor. Thereby, it is also possible to reduce the management cost.

  Moreover, in this case, the arrangement of the circulation device 6 and the expansion tank 7 can be set separately according to the position and size of the space provided below the hot water heater 2, so that the entire hot water supply system 1 is consolidated in a small size. Can be configured. Therefore, it is more difficult to receive restrictions on the installation location, and versatility is even better. In particular, when only one water heater 2 is installed, or when two water heaters 2 are installed in the front-rear state with the rear surface aligned, the circulation device 6 and the expansion tank 7 are connected to the front-rear direction of the water heater 2. If it arrange | positions forward and backward, since the left-right width of the hot water supply system 1 can be set small, it is hard to receive the restriction | limiting of an installation place. Therefore, versatility is further improved.

  In the above embodiment, the water supply main pipe 3A and the hot water supply main pipe 3B are respectively provided with the common water heater pipe connection part 33 and the forward pipe connection part 36. The hot water pipe connection part 36 may be provided, or the hot water supply pipe connection part 33 (water supply pipe connection part 33a) on the water supply main pipe 3A side and the hot water supply pipe connection on the hot water supply main pipe 3B side. The part 33 (the hot water pipe connection part 33b) may have a different connection structure.

DESCRIPTION OF SYMBOLS 1 Hot water supply system 11 Inlet pipe 12 Outlet pipe 13 Outgoing pipe 14 Return pipe 2 Hot water heater 20 Hot water supply body case 21 Water inlet 22 Hot water outlet 3A Hot water main pipe 3B Hot water main pipe 33 Hot water pipe connection 36 Outgoing pipe connection 4 Return main piping 42 Internal piping connection 6 Circulating device 60 Circulating device body case (housing)
61 Hot water outlet 62 Hot water inlet 63 Water flow pipe 64 Pressure relief valve 65 Circulation pump 7 Expansion tank 8 Base 80 Support frame L1 Water supply pipe L2 Hot water supply pipe

Claims (3)

A water heater that heats hot water to a predetermined temperature, a circulation device that circulates hot water in a circulation path constructed between the hot water supply pipe and the water heater, an expansion tank that absorbs the volume expansion of hot water in the circulation path, and A main pipe for water supply that introduces water from the water supply pipe to the water heater, a main pipe for hot water that leads hot water from the water heater to the hot water supply pipe, a return main pipe that leads hot water from the hot water supply pipe to the circulation device, and these water heaters, A hot water supply system including a circulation device, an expansion tank, a main pipe for water supply, a main pipe for hot water supply, and a gantry supporting the return main pipe,
The circulation device includes a water flow pipe constituting a part of the circulation path, a circulation pump for circulating hot water in the water flow pipe from the hot water inlet side to the hot water outlet side, and an excessive pressure rise in the circulation path. Configured as a single unit comprising at least a pressure relief valve for suppressing
A hot water supply system constructed by assembling a water heater on the top of the gantry and assembling a circulation device, an expansion tank, a main pipe for water supply, a main pipe for hot water supply and a return main pipe below the water heater on the gantry. The hot water supply system according to claim 1,
The main pipe for water supply and the main pipe for hot water supply each have a common water heater pipe connection and forward pipe connection,
When constructing a hot water circulation path between a water heater and a hot water supply pipe, the water inlet of the water heater and the pipe connection for the water heater of the main water supply pipe are connected by a water inlet pipe, and the hot water outlet of the water heater and the hot water supply are connected. The hot water supply pipe connection part of the main pipe is connected with a hot water outlet pipe, the forward pipe connection part of the hot water supply main pipe is sealed with a stopcock, and the hot water outlet of the circulation device and the forward pipe connection part of the main water supply pipe Are connected by a forward pipe, and the hot water supply port of the circulation device and the inner pipe connection part of the return main pipe are connected by a return pipe. The hot water supply system according to claim 1 or 2,
The hot water supply system in which the circulation device and the expansion tank are arranged in the front-rear direction of the water heater.

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