JP2013002786A - Hot water supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water supply system capable of increasing a volume of an expansion tank while ensuring uniformity in design of a water heater body and a pump unit.SOLUTION: This hot water supply system 1 in which the water heater body 2 having a combustion device 8 for heating hot water/water, and the pump unit 3 having a circulation pump 13 and the expansion tank 17, are connected by a pipe, includes a function to allow the hot water/water of a prescribed temperature to retain in a circulation circuit 19 including both devices. A housing 6 of the pump unit 3 is provided with an auxiliary pipe joint 80, and the auxiliary pipe joint 80 can be connected to a branch section 54 of a pipe disposed inside of the housing 6 through a branch pipe 83. The auxiliary pipe joint 80 can be connected to an auxiliary expansion tank 18 through an auxiliary pipe 85 at the outside of the housing 6.

Description

  The present invention relates to an instant hot water supply system.

  Conventionally, as a form of heat source means in commercial facilities such as hotels and public baths, a hot water supply system having an immediate hot water function capable of generating hot water at a temperature set by a remote controller or the like in advance at the time of hot water. (Hereinafter also referred to as an instant hot water supply system). This type of instant hot water supply system is provided with a circulation circuit for circulating hot water in addition to the structure of a normal hot water supply device, and the hot water is maintained at a set temperature in the circulation circuit until there is a demand for hot water. It is configured to be able to wait.

  For example, in Patent Document 1, a general-purpose water heater main body (heat source means) unitized with a combustor, a heat exchanger, and the like, and a pipe configured to connect the water heater main body with a currant, etc. A hot water supply system is disclosed. The immediate hot water supply system is configured such that a circulation circuit formed by piping or the like is provided with a circulation pump that forms a water flow and an expansion tank that absorbs the volume expansion of hot water caused by heating.

JP 2004-44973 A

  By the way, in recent years, a technique for the purpose of improving the workability of an instant hot water supply system has been developed. That is, a pump unit including devices such as a circulation pump and an expansion tank that are unitized in one housing is widely used in the market. If such a pump unit is adopted, the troublesomeness of selecting a circulation pump, an expansion tank or the like at the construction site can be eliminated, and extra labor in construction can be saved.

However, the pump unit according to the prior art has a housing size larger than that of the water heater main body, and the water heater main body is a wall-mounted type. It was lacking.
Note that the “wall-mounted type” here refers to a case where it is actually attached to a wall and a case where it is attached to a support member such as a gantry.

Thus, as shown in FIG. 10, the inventors made a prototype of an instant hot water supply system 101 in which the casings of both the water heater body 102 and the pump unit 103 have the same size and both are wall-mounted.
According to the instant hot water supply system 101, while improving the overall design, it is possible to exhibit almost the same functions as the conventional technology.

  However, the prototype hot-water supply system 101 has a configuration in which the expansion tank is built in a casing having the same size as the main body of the water heater, and thus has a physical limitation that the volume of the tank cannot be increased beyond a certain level. That is, the prototype hot water supply system 101 has a problem that an expansion tank having a capacity exceeding the size of the casing of the pump unit 103 cannot be employed. Due to such circumstances, in a facility where the circulation circuit constituting the hot water supply system is longer than a certain length, or in a facility where the number of installed hot water heater bodies is greater than a certain number, the capacity of the expansion tank is insufficient. There was a concern that 101 could not be installed.

  Therefore, an object of the present invention is to provide a hot water supply system capable of increasing the capacity of the expansion tank while ensuring the uniformity of the design of the water heater main body and the pump unit.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a heat source means for heating hot water and a pump unit having a circulation pump and an expansion tank in a predetermined housing are connected by piping, and both devices are interposed therebetween. A hot water supply system having a function of retaining hot water at a predetermined temperature in the pipe and discharging the hot water from the retained hot water as required, wherein the pipe disposed in the housing has a branching portion. The casing is provided with an auxiliary pipe connecting portion capable of communicating a branch pipe connected to the branch section with an external pipe.

  The hot water supply system of the present invention is configured such that the capacity of the expansion tank can be increased while ensuring the unified design of the heat source means and the pump unit. That is, in the present invention, an auxiliary pipe connecting portion that can communicate with the branch portion is provided in the casing of the pump unit, and the branch portion and the pipe arranged outside can be communicated with each other through the auxiliary pipe connecting portion. It was. And the capacity | capacitance of the expansion tank of the whole hot-water supply system is strengthened by connecting the external piping connected with the auxiliary | assistant piping connection part, and the expansion tank for expansion. Thereby, an expansion tank having a capacity suitable for the construction site can be provided regardless of physical restrictions due to the size of the casing of the pump unit. In other words, the present invention can be used for installation outside the casing of the pump unit in a facility where the flow path of hot water constituting the hot water supply system is longer than a certain length, or in a facility where the number of heat source means is greater than a certain number. An expansion tank is provided to increase the capacity of the expansion tank.

Here, as described above, the present inventors made a prototype of a hot water supply system in which the pump unit was a wall-hanging type, similar to the hot water heater body (heat source means), and the design of the entire hot water supply system was unified. . Moreover, in such a wall-mounted pump unit and heat source means, a piping connection port that forms part of the hot water flow path is usually provided on the surface corresponding to the bottom surface. The prototype hot water supply system has a configuration in which a main pipe for supplying hot water to each device is arranged at a position further below the bottom surface of each device.
That is, in the present invention, for example, when the configuration of the prototype hot water supply system is adopted, the expansion tank for expansion can be provided at a position where the main piping below the pump unit and the heat source means is arranged. Thereby, before and after adding an expansion tank, the designability of the whole hot-water supply system is not impaired.
Therefore, according to the present invention, since the capacity of the expansion tank can be increased without changing the size of the casing of the pump unit, it is possible to increase the capacity of the entire hot water supply system while maintaining the unified design. It is possible to install an expansion tank of suitable capacity.

  In the invention according to claim 2, the pump unit has a pipe connection part for connecting the pipe connected to the heat source means, and the pipe connection part and the auxiliary pipe connection part are based on a normal installation state. The hot water supply system according to claim 1, wherein the hot water supply system is provided on a surface in the same direction of the pump unit.

  According to such a configuration, since all the pipes connected to the pump unit are provided on the surface in the same direction of the pump unit with respect to the normal installation state, the unit of the pump unit is united, and the design has unity. can do. In addition, since the expansion tank for expansion can be provided so as to be mixed with the piping arranged outside the pump unit, there is a concern that even if the expansion tank for expansion is provided, there is no feeling of retrofit and the design property is impaired. Absent.

  According to a third aspect of the present invention, the heat source means and the pump unit are fixed at a position apart from the floor by a certain distance or more. When an auxiliary expansion tank is added, the auxiliary expansion tank is a heat source means or a pump. The hot water supply system according to claim 1 or 2, wherein the hot water supply system is disposed below the unit.

According to such a configuration, the heat source means and the pump unit are fixed at a position apart from the floor surface by a so-called wall-mounted type, and the auxiliary expansion tank added to the space formed below both devices is arranged. Therefore, it is extremely unlikely that the unified design will be damaged before and after the expansion tank is added.
Note that the “wall-mounted type” here refers to a case where it is actually attached to a wall and a case where it is attached to a support member such as a gantry.

  In the hot water supply system according to the present invention, it is preferable that the branch portion is disposed inside a housing and is disposed in a return pipe through which hot water travels through an expansion tank. (Claim 4)

  In the hot water supply system of the present invention, a branch portion is provided in the pipe arranged in the casing of the pump unit, and the branch section and the auxiliary pipe connecting portion provided in the casing of the pump unit can be communicated via the branch pipe. Further, the auxiliary pipe connection portion and a pipe arranged outside the pump unit (referred to as auxiliary external pipe) can be communicated with each other. Thereby, since the expansion tank for expansion can be attached to the auxiliary external pipe, the capacity of the expansion tank can be increased without changing the size of the casing of the pump unit. That is, in the present invention, the design is not impaired even after the expansion tank is added.

It is an operation principle figure showing the hot-water supply system concerning the embodiment of the present invention. It is a front view which shows a part of actual hot-water supply system. It is the figure which paid its attention to the housing | casing of the water heater main body of FIG. 2, (a) is a perspective view, (b) is the top view seen from the downward direction. It is the figure which paid its attention to the housing | casing of the pump unit of FIG. 2, (a) is a perspective view, (b) is the top view seen from the downward direction. It is a conceptual diagram which shows the flow of the hot water at the time of the hot water supply operation of the hot water supply system of FIG. It is a conceptual diagram which shows the flow of the hot water at the time of the hot water operation of the hot water supply system of FIG. It is a perspective view which shows the connection mount frame employ | adopted as the hot water supply system of FIG. It is a side view which shows the actual piping of the hot-water supply system of FIG. It is a perspective view which shows the cover member which covers the lower stage side of the connection stand of FIG. It is a front view which shows a part of prototype hot-water supply system.

Next, the hot water supply system 1 according to the embodiment of the present invention will be described.
As shown in FIGS. 1 and 2, a hot water supply system 1 according to the present embodiment includes a plurality of (two in the present embodiment) water heater body (heat source unit) 2, circulation pumps 13, 14, and the like. 3 and these are connected using piping or the like. The hot water supply system 1 has a control device 50, and the control device 50 is a system in which the plurality of hot water heater main bodies 2 and the pump units 3 are collectively controlled.
The operation of the hot water supply system 1 according to the present invention is the same as that of a known technique, and the characteristic configuration is in the structure. Therefore, the description of the operation will be omitted below, and the description will be made focusing on the structure.

First, description will be made by paying attention to main components in the hot water supply system 1.
The water heater main body 2 is the same as that known in the art, and in this embodiment, both units have the same function and ability. Specifically, the water heater main body 2 includes a heat source housing 5, and a combustion device 8 that burns fuel gas in the heat source housing 5 and a controller 51 that controls the combustion device 8 and the like are built in. Has been.

As shown in FIG. 3, the heat source housing 5 includes a housing body 5a having one surface opened and a lid 5b that covers an open portion of the housing body 5a.
The casing body 5a is provided with a plurality of pipe joints 40, 41, and 42 on the bottom surface side (in the present embodiment, paying attention to three types for water entry, hot water discharge, and drainage) on the basis of a normal installation state. . That is, as shown in FIG. 3B, the housing body 5a is provided with a heat source side water inlet pipe joint 40 on the bottom surface, slightly below the center and slightly to the right, with reference to the two-dot chain line, and slightly above the center. A hot water outlet pipe joint 41 is arranged from the left, and a heat source side drain pipe joint 42 is arranged on the upper left side.
As shown in FIG. 2, the heat source casing 5 has a hopper joint 35 attached at a position downstream of the heat source side drainage pipe joint 42. The hopper joint 35 is similar to a known one.
Further, although the casing main body 5a is provided with a gas pipe joint or the like, the description is omitted because it is not a configuration particularly related to the present invention.

As shown in FIG. 1, the combustion device 8 includes a combustion unit 9, a heat exchange unit 11 that recovers thermal energy of combustion gas generated by combustion in the combustion unit 9 and heats hot water, and a combustion device 8. And a blower 10 for supplying air.
The combustion unit 9 is connected to a fuel system (not shown), and is composed of a plurality of burners 12 that burn fuel gas supplied from the fuel system (not shown).
The heat exchanging unit 11 is mainly located on the downstream side in the flow direction of the combustion gas from the primary heat exchanger 15 in which the sensible heat is recovered and the hot water is heated, and the water vapor contained in the combustion gas It has a secondary heat exchanger 16 that mainly recovers latent heat and heats hot water. In the secondary heat exchanger 16, condensed water (so-called drain) is generated during the recovery of latent heat, and therefore, the drain generated in the secondary heat exchanger 16 is drained to the heat exchange unit 11 of the present embodiment. A drain discharge system 65 is provided.
The blower 10 is similar to a known one, includes a fan (not shown) inside, and can adjust the blower amount and the like according to the combustion amount of the combustion unit 9.

  The controller 51 is provided in each water heater main body 2 and is electrically connected to a control device 50 that can be controlled in a centralized manner. That is, the controller 51 transmits and receives signals to and from the control device 50 to control individual water heater main bodies 2.

  The pump unit 3 has a pump unit housing 6, the two circulation pumps 13 and 14 in the pump unit housing 6, and an expansion tank 17 that equalizes excessive pressure rise and pressure drop in the pipe. And a controller 53 for controlling the circulation pumps 13 and 14 and the like.

As shown in FIG. 4, the pump unit housing 6 is configured by a housing body 6 a having one surface opened and a lid portion 6 b that covers an open portion of the housing body 6 a, as in the water heater body 2. Yes.
The housing main body 6a has a plurality of pipe joints 44, 43, 45, 80 on the bottom surface side (in the present embodiment, four types for water entry, discharge, drainage, and auxiliary) on the basis of a normal installation state. Is installed. That is, as shown in FIG. 4 (b), the housing body 6a is provided with a unit side water inlet pipe joint 44 on the bottom surface, slightly below the center and slightly on the right, with reference to the two-dot chain line, and slightly above the center. The discharge pipe joint 43 is arranged on the left side, the auxiliary pipe joint 80 is arranged on the left side of the discharge pipe joint 43, and the unit side drain pipe joint 45 is arranged on the upper left side. .
As shown in FIG. 2, the hopper joint 35 is attached to the pump unit housing 6 at a position downstream of the unit side drainage pipe joint 45. The hopper joint 35 is similar to a known one.

The circulation pumps 13 and 14 supply hot water using a motor (not shown) as a drive source, and a known spiral pump is adopted. In addition, the circulation pump 14 in this embodiment is used for the temporary use used at the time of the maintenance of the main circulation pump 13, a failure, etc., or for the low tension used every predetermined time with the circulation pump 13.
The expansion tank 17 is a sealed tank that suppresses a pressure increase due to volume expansion or pressure decrease due to contraction caused by a temperature change of hot water. A safety valve 54 is provided in the vicinity of the expansion tank 17, and a hot water discharge system 66 (FIG. 1) that discharges hot water in the pipe to the outside when the pressure rises beyond the allowable range of the expansion tank 17. Is provided.

  The controller 53 is provided in the pump unit 3 and is electrically connected to a control device 50 that can be controlled collectively. That is, the controller 53 controls the pump unit 3 by transmitting and receiving signals to and from the control device 50.

  In the present embodiment, the remote controller 52 and the control device 50 are electrically connected. When the user operates the remote controller 52, a signal is transmitted to each of the controllers 51 and 53 via the control device 50. .

Next, the flow path in the hot water supply system 1 of the present embodiment will be described.
The hot water supply system 1 is mainly provided with a hot water supply system 20 for hot water supply and a drainage system 21 for drainage.

The hot water supply system 20 in this embodiment is roughly divided into two paths, a hot water supply path through which hot water flows during hot water supply operation, and an immediate hot water path through which hot water flows during hot water operation. In the present embodiment, these paths are a water supply passage 22 for flowing hot water supplied from a water supply source (not shown) to the water heater main body 2, and a hot water flow passage 23 for flowing hot water discharged from the water heater main body 2 to the currant 60. And a hot water supply side return passage 24 for circulating hot water from the currant 60 to the hot water heater body 2 again.
Specifically, as shown in FIG. 5, the hot water supply path is formed by the water supply flow path 22 and the hot water flow path 23, and the immediate hot water supply path is formed of the water supply flow path 22 as shown in FIG. 6. A circulation circuit 19 having a part, a hot water flow path 23 and a hot water supply side return flow path 24 as constituent elements is formed.

As shown in FIG. 1, the water supply flow path 22 includes a water supply main pipe 25 connected to a water supply source and water supply branch pipes 26 and 27 branched from the water supply main pipe 25 in order from the upstream side to the downstream side. The heat source side incoming water pipe joint 40 attached to the water heater body 2 and the internal upstream side flow path 33 connected to the upstream side of the heat exchanging section 11 which is a pipe inside the water heater body 2. ing. The internal upstream flow path 33 is connected to a bypass pipe 48 that bypasses the heat exchange unit 11. That is, the water supply flow path 22 is a flow path for supplying hot water that has passed through the water supply main pipe 25 to the heat exchange section 11 of one or both of the water heater main bodies 2.
A hot water flow rate sensor 55 and an incoming water temperature sensor 56 are provided in the middle of the internal upstream flow path 33 of the water heater body 2, and a bypass water amount sensor 59 and a water amount adjustment valve 61 are provided in the middle of the bypass pipe 48. Each device is electrically connected to the controller 51.

The hot water flow passage 23 is attached to the hot water main pipe 28 connected to the currant 60, the hot water branch pipes 29 and 30 branched from the hot water main pipe 28, and the water heater main body 2 in order from the downstream side to the upstream side. The hot water outlet pipe joint 41 and the internal downstream flow path 34 which is a pipe inside the water heater main body 2 and connected to the downstream side of the heat exchanging section 11 are formed. That is, the hot water flow path 23 is a flow path for supplying hot water that has passed through the heat exchange unit 11 to the currant 60.
A flow rate adjustment valve 57, a hot water temperature sensor 58, and the like are provided in the middle of the internal downstream side flow path 34 of the water heater body 2, and each device is electrically connected to the controller 51.

  The hot water supply side return flow path 24 is a flow path that is located on the downstream side of the hot water flow path 23 in the hot water flow direction, and circulates hot water that has passed through the hot water flow path 23 to the hot water supply body 2 side as needed. It is a flow path to be made. That is, the hot water supply side return flow path 24 is connected to the return main pipe 31 connected to the downstream end of the hot water main pipe 28 in order from the upstream side to the downstream side with respect to the currant 60, and the return main pipe 31. A connecting pipe 32 positioned between the downstream end and the pump unit 3, a unit-side water inlet pipe joint 44 attached to the pump unit 3, an internal pipe 46 of the pump unit 3, and a discharge pipe joint 43; And a pump unit branch pipe (hereinafter also simply referred to as a unit branch pipe) 49 connected in the middle of the water supply main pipe 25. That is, the hot water supply side return flow path 24 is a flow path for flowing hot water not discharged from the currant 60 to the water supply main pipe 25 via the pump unit 3.

Further, the circulation pumps 13 and 14 are arranged in the middle of the internal piping 46 of the pump unit 3, and the expansion tank 17 is arranged upstream of the circulation pumps 13 and 14.
The present embodiment has a tank return pipe 62 branched from a flow path connected to the circulation pumps 13 and 14, and the tank return pipe 62 constitutes a flow path connected to the expansion tank 17. That is, the tank return pipe 62 is connected between the unit-side water inlet pipe joint 44 and the circulation pumps 13 and 14, and is a flow path through which hot and cold water flows according to a change in pressure in the circulation circuit 19.

In addition, a branch portion 54 is provided in the middle of the tank return pipe 62, and a branch pipe 83 is connected to the branch portion 54. The branch pipe 83 is connected to an auxiliary pipe joint 80 provided in the pump unit housing 6 of the pump unit 3, and a flow path for guiding the hot water branched by the branch portion 54 to the outside of the pump unit housing 6. It is. Note that so-called cheese is attached to the branch portion 54 with a “T” -shaped joint.
The auxiliary pipe joint 80 is connected to the auxiliary pipe 85 outside the pump unit housing 6.
Therefore, in this embodiment, the branch pipe 83 is connected to the auxiliary pipe joint 80, the auxiliary pipe joint 80 is connected to the auxiliary pipe 85 arranged outside, and the auxiliary pipe 85 is connected to the auxiliary expansion tank. 18 is connected.

As described above, the drainage system 21 is configured by the drainage drainage channel 63 partially including the drainage drainage system 65 and the hot water drainage channel 64 partially including the hot water drainage system 66.
The drainage drainage channel 63 is a channel for draining the drain generated in the secondary heat exchanger 16 to the outside. The drainage drainage pipe 67 connected to an external pipe or the like, and the drainage main pipe 67 to the water heater main body 2. A branched hot water supply side drainage branch pipe 68, a hopper joint 35 (FIG. 2) attached to the upstream end of the hot water supply side drainage branch pipe 68, a heat source side drainage pipe joint 42 attached to the water heater body 2, and a drain. A discharge system 65 is formed.

The hot water drainage channel 64 is a channel connected to piping downstream of the circulation pumps 13 and 14, and is a main drainage pipe 67 and a unit side drainage branching pipe branched from the drainage main pipe 67 to the pump unit 3. 70, a hopper joint 35 (FIG. 2) attached to the upstream end of the unit side drain branch pipe 70, a unit side drain pipe joint 45 attached to the pump unit 3, and a hot water discharge system 66. Yes.
That is, the drainage system 21 is a flow path for draining drained water and unnecessary hot water discharged from the water heater body 2 and the pump unit 3 to the outside.

Next, the positional relationship of each member when the hot water supply system 1 of the present embodiment is installed on a gantry will be described.
In the present embodiment, as described above, the pump unit housing 6 is designed to be approximately the same size as the heat source housing 5 and is configured to be wall-mounted. That is, using the connection stand 7 shown in FIG. 7, the two water heater main bodies 2 and the one pump unit 3 are juxtaposed and fixed to the upper side from the center in the height direction of the connection stand 7. (FIG. 2). In other words, in this embodiment, the connection stand 7 that is originally used exclusively for the water heater main body 2 is configured to be used as a fixing means of the pump unit 3.

  Further, in the present embodiment, as shown in FIG. 2, hot water branches to the respective water heater main bodies 2 and the pump units 3 on the lower side from the center in the height direction of the connection stand 7, or hot water flows to each water heater main body 2. The main pipes 25, 28, 31, and 67 that are aggregated from the pump unit 3 are arranged. The main pipes 25, 28, 31, 67 are arranged so as to extend in the direction in which the upper water heater main body 2 and the pump unit 3 are arranged on the upper side of the connecting frame 7, and are connected to each water heater main body 2. The branch pipes 26 and 27 and the hot water branch pipes 29 and 30 and the connecting pipe 32 and the unit branch pipe 49 connected to the pump unit 3 are arranged.

Furthermore, in the present embodiment, the auxiliary expansion tank 18 is attached so as to communicate with the auxiliary pipe joint 80 provided in the pump unit 3 on the lower side in the height direction of the coupling base 7. Specifically, on the outside of the pump unit housing 6, one end of the auxiliary pipe 85 is connected to the auxiliary pipe joint 80, and the other end of the auxiliary pipe 85 is connected to the auxiliary pipe 85. An expansion tank 18 is connected. That is, the auxiliary expansion tank 18 is disposed outside the pump unit housing 6 and is in a positional relationship with the expansion tank 17 disposed inside the pump unit housing 6. More specifically, as shown in FIG. 8, the auxiliary expansion tank 18 is positioned below the pump unit 3 and on the front side (left side in FIG. 8) of the main pipes 25, 28, 31, 67. It is provided and is arranged so as to fit in the lower stage side of the connecting frame 7.
A branch pipe 83 connected to the branch portion 54 is connected to the auxiliary pipe joint 80 on the inner side of the pump unit housing 6.

As described above, in the present embodiment, the auxiliary pipe joint 80 for adding an expansion tank is provided in the pump unit housing 6 of the pump unit 3, and the auxiliary expansion tank 18 can be attached as necessary. Therefore, when the capacity of the expansion tank 17 provided in advance in the pump unit 3 is not suitable for the construction site, that is, the facility in which the circulation circuit 19 constituting the hot water supply system 1 becomes longer than a certain length, or the hot water heater body 2 Even in a facility where the number of installed units becomes a certain number (for example, three) or more, the capacity of the expansion tank can be easily increased without changing the size of the pump unit casing 6. That is, when the capacity of the expansion tank 17 is not suitable for the construction site, the branch portion 54 and the auxiliary pipe joint 80 provided in the pump unit casing 6 are connected by the branch pipe 83 and are used for the pump unit. The auxiliary pipe 85 is connected to the auxiliary pipe joint 80 on the outside of the housing 6 to form a series of flow paths, and the auxiliary expansion tank 18 is connected to the series of flow paths. Then, the auxiliary expansion tank 18 has a positional relationship in parallel with the existing expansion tank 17, and the capacity of the expansion tank is substantially increased.
Thus, in this embodiment, since it is the structure which connects the expansion tank 18 for auxiliary | assistant to the piping taken out of the housing | casing 6 for pump units, there is a space margin inside the housing 6 for pump units. Regardless of whether or not, the capacity of the expansion tank can be increased. That is, since the auxiliary expansion tank 18 can be added without changing the size of the pump unit housing 6, the uniform design of the water heater body 2 and the pump unit 3 is not impaired.

  Moreover, in this embodiment, the cover member 90 which covers the lower stage of the connection mount frame 7 shown in FIG. 9 is provided. That is, the cover member 90 can conceal the piping, the auxiliary expansion tank 18 and the like disposed below the hot water heater main body 2 and the pump unit 3. Thereby, before and after adding the auxiliary expansion tank 18, the designability of the entire hot water supply system 1 does not change, and it is possible to ensure high designability.

  In the above-described embodiment, the auxiliary pipe joint 80 provided in the pump unit housing 6 is disposed at the left position of the discharge pipe joint 43. However, the present invention is not limited to this, and the discharge pipe joint 80 is used for discharge. It may be the right or upper side of the pipe joint 43 or may be arranged at any location.

  In the above embodiment, the configuration in which the branch portion 54 provided in the pump unit 3 is arranged in the tank incoming pipe 62 is shown, but the present invention is not limited to this, and the pipe arranged in the pump unit housing 6 As long as it is a configuration, it may be arranged at any location. That is, the position of the branch portion 54 may be any location as long as the branch pipe connected to the auxiliary pipe joint 80 can be connected and the expansion tank for expansion can be arranged in parallel with the existing expansion tank 17.

  In the above embodiment, the configuration in which the auxiliary expansion tank 18 is connected to the auxiliary pipe 85 is shown, but the present invention is not limited to this, and the auxiliary expansion tank 18 is directly connected to the auxiliary pipe joint 80 without using the auxiliary pipe 85. It may be a configuration. When this configuration is adopted, it is a precondition that there is no other pipe or the like within a certain range of the auxiliary pipe joint 80.

  In the above-described embodiment, the configuration in which the “T” -shaped cheese is attached to the branch portion 54 is shown. However, in the present invention, when the expansion of the auxiliary expansion tank 18 is not required, the straight pipe is used instead of the cheese. Mold pipe joints can also be installed.

DESCRIPTION OF SYMBOLS 1 Hot-water supply system 2 Hot-water supply body 3 Pump unit 5 Heat source housing 6 Pump unit housing 13 Circulation pump 17 Expansion tank 18 Auxiliary expansion tank 40 Heat source side inlet pipe joint 41 Hot water outlet pipe joint 42 Heat source side drain pipe Joint 43 Discharge pipe joint 44 Unit side water inlet pipe joint 45 Unit side drain pipe joint 54 Branch section 62 Tank return pipe 80 Auxiliary pipe joint 83 Branch pipe 85 Auxiliary pipe

Claims (4)

A heat source means for heating hot water and a pump unit having a circulation pump and an expansion tank in a predetermined housing are connected by piping, and hot water at a predetermined temperature is retained in both devices and the piping between them to meet the requirements. A hot water supply system having a function of discharging hot water from hot water depending on the situation,
The piping arranged in the housing has a branching portion,
The hot water supply system is characterized in that the casing is provided with an auxiliary pipe connecting portion capable of communicating a branch pipe connected to the branch portion with an external pipe. The pump unit has a pipe connection part for connecting a pipe connected to the heat source means,
The hot water supply system according to claim 1, wherein the pipe connection part and the auxiliary pipe connection part are provided on a surface in the same direction of the pump unit based on a normal installation state. The heat source means and the pump unit are fixed at a position away from the floor by a certain distance,
3. The hot water supply system according to claim 1, wherein when an auxiliary expansion tank is added, the auxiliary expansion tank is disposed below the heat source means or the pump unit.   The hot water supply system according to any one of claims 1 to 3, wherein the branch portion is disposed inside a casing, and is arranged in an incoming / outgoing pipe through which hot and cold water passes through an expansion tank.

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