JP5621763B2 - Drainage pipe fitting - Google Patents

Description

  The present invention relates to a drain pipe joint to which a drain pipe is connected.

  Conventionally, there is a drain pipe joint to which a drain pipe extending from a hot water storage tank is connected. For example, a plurality of drain pipes extending from a hot water storage tank are connected to a drain plug (corresponding to a drain pipe joint) of a hot water storage unit disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2010-2061). Further, the drain plug is formed with a drain port for discharging water flowing into the drain plug from a plurality of drain pipes to the outside of the hot water storage unit.

  By the way, in the drain plug disclosed in Patent Document 1, the bottom surface of the water conduit that is a water passage from the connection portion between the drain pipe and the drain plug to the drain outlet is configured to be substantially horizontal. ing. Thus, when the water conduit is configured substantially horizontally, the water that has flowed into the water conduit from the drain pipe may not flow to the drain and may accumulate in the water conduit. In such a case, the water collected in the water conduit may freeze due to the drain outlet coming into contact with cold outside air. And when the water collected in the water channel is frozen and ice is generated, the water further touches the generated ice, so that ice grows in the water channel and the water channel may be blocked. In addition, freezing and thawing are repeated in the water conduit, and the drainage pipe joint is deteriorated, which may shorten the product life.

  Then, the subject of this invention is providing the drainage pipe joint which can reduce the possibility that a water conduit may be obstruct | occluded and can reduce the possibility of deterioration.

The drainage pipe joint according to the first aspect of the present invention is a drainage pipe that is connected to a hot water storage tank housed in a casing or a drainage pipe through which drainage from a water pipe extending from the hot water storage tank flows and is fixed to the bottom surface of the casing A joint, comprising a first receiving part, a discharge part, and an intermediate part. The first receiving unit receives water flowing through the drain pipe. The discharge part is formed with a discharge port for discharging the water received from the first receiving part to the outside. The intermediate part is interposed between the first receiving part and the discharging part. Moreover, the intermediate part is extended in the substantially horizontal direction. Further, the intermediate portion has a water conduit of the flow of water discharged from the discharge port, and projects downward as a large portion of the intermediate portion does not contact the bottom surface and a contact portion for contacting a bottom surface. Further, the bottom surface of the water conduit is inclined by a predetermined angle with respect to the horizontal plane so that the discharge portion side is lowered.

  In the drainage pipe joint according to the first aspect of the present invention, the bottom surface of the water conduit is inclined at a predetermined angle with respect to the horizontal plane so that the discharge portion side is lowered. For this reason, the water flowing in the water conduit is likely to flow toward the discharge port. Therefore, since it becomes difficult for water to accumulate in a water conduit, the possibility of water freezing in the water conduit can be reduced. Thus, in this drain pipe joint, since the possibility of water freezing in the water conduit can be reduced, the generation and growth of ice can be suppressed, and the risk of the water conduit being blocked can be reduced. it can. Also, with this drainage pipe joint, it is possible to reduce the risk of water freezing in the water conduit, so the risk of repeated freezing and thawing of water in the water conduit can be reduced, and there is a risk of deterioration. Can be reduced.

  A drainage pipe joint according to a second aspect of the present invention is the drainage pipe joint according to the first aspect, wherein the first receiving portion is connected to the first pipe of the drainage pipe. Moreover, a second receiving part is further provided. A 2nd receiving part receives the water which flows through the 2nd piping of the drain pipe different from 1st piping. In this drainage pipe joint, water flowing from a plurality of drainage pipes can be discharged to the outside from one discharge port.

  The drain pipe includes, for example, a metal pipe, a resin pipe, a rubber hose, and a tube.

  The drainage pipe joint according to the third aspect of the present invention is the drainage pipe joint according to the second aspect, wherein the first receiving part is disposed so as not to face the discharge part. In this drainage pipe joint, since the bottom surface of the water conduit is inclined at a predetermined angle with respect to the horizontal plane so that the discharge part side is lowered, the first receiving part and the discharge part are not arranged to face each other. In addition, the water received from the first receiving part can be easily discharged to the outside through the discharge port.

  The drainage pipe joint according to a fourth aspect of the present invention is the drainage pipe joint according to any one of the first aspect to the third aspect, wherein the first receiving portion generates the expanded water generated when the water in the hot water storage tank is heated. accept. In this drain pipe joint, every time the water in the hot water storage tank is heated, the high-temperature expansion water is received from the first receiving portion and flows in the water conduit. For this reason, when the water is frozen in the water conduit, every time the water in the hot water storage tank is heated, the water in the water conduit is thawed, and the deterioration of the drainage pipe joint is promoted. There is a fear. Here, in this drainage pipe joint, the bottom surface of the water conduit is inclined at a predetermined angle with respect to the horizontal plane so that the discharge portion side is lowered, so that water does not easily accumulate in the water conduit. Freezing of water in the water channel is suppressed. Therefore, in this drainage pipe joint, even if high temperature water flows in the water conduit, it is possible to reduce the possibility of deterioration being accelerated.

  The drainage pipe joint according to the fifth aspect of the present invention is the drainage pipe joint according to any one of the first to fourth aspects, wherein the predetermined angle is not less than 1 degree and not more than 4 degrees. For this reason, even if the housing | casing to which a drain pipe joint is fixed is not installed horizontally, a possibility that water may accumulate in a water conduit can be reduced.

  The drainage pipe joint according to a sixth aspect of the present invention is the drainage pipe joint according to any one of the first aspect to the fifth aspect, wherein the bottom surface of the water conduit is lowered along the flow direction of the water discharged from the discharge port. It is inclined so that the center side in the direction intersecting the flow direction is lower than the end side. For this reason, for example, the bottom surface of the water conduit is inclined so as to be lower along the flow direction of the water discharged from the discharge port, but the center side in the direction intersecting the flow direction is more than the end side. Compared with a drainage pipe joint that is not inclined so as to be lowered, it is possible to further reduce the possibility of water collecting in the water conduit.

  The drainage pipe joint according to the seventh aspect of the present invention is the drainage pipe joint according to any one of the first to sixth aspects, wherein the first receiving portion extends upward and the discharge portion extends downward.

  A drainage pipe joint according to an eighth aspect of the present invention is the drainage pipe joint according to any one of the first to seventh aspects, wherein the water conduit has a first casing including a first receiving part and a second casing including a discharge part. It is formed by connecting the casing.

  In the drainage pipe joint according to the first aspect of the present invention, it is possible to reduce the possibility that the water conduit is blocked and to reduce the possibility of deterioration.

  In the drainage pipe joint according to the second aspect of the present invention, water flowing from the plurality of drainage pipes can be discharged to the outside from one discharge port.

  In the drainage pipe joint according to the third aspect of the present invention, the water received from the first receiving portion can be easily discharged to the outside from the discharge port.

  In the drainage pipe joint according to the fourth aspect of the present invention, even if water having a high temperature flows in the water conduit, it is possible to reduce the possibility that the deterioration is promoted.

  In the drainage pipe joint according to the fifth aspect of the present invention, even if the casing to which the drainage pipe joint is fixed is not installed horizontally, the possibility of water collecting in the water conduit can be reduced.

  In the drainage pipe joint according to the sixth aspect of the present invention, the possibility of water collecting in the water conduit can be reduced.

  In the drain pipe joint according to the seventh aspect of the present invention, the first receiving portion extends upward, and the discharge portion extends downward.

  In the drainage pipe joint according to the eighth aspect of the present invention, the water conduit is formed by connecting the first casing including the first receiving portion and the second casing including the discharge portion.

Piping system diagram of hot water storage unit. It is an external view of a hot water storage unit, (a) The front view of a hot water storage unit, (b) The side view of a hot water storage unit. The external appearance perspective view of the three-way valve for drainage. Sectional drawing of the three-way valve for drainage. The figure for demonstrating the position of the operation part of the three-way valve for drainage, and the connection state of piping. The figure which shows the state by which the three-way valve for drainage and the piping joint were attached to the casing. The figure which shows the state by which the three-way valve for drainage and the piping joint were attached to the casing. The figure which shows the state by which the three-way valve for drainage and the piping joint were attached to the casing. The external appearance perspective view of the piping joint which concerns on one Embodiment of this invention. The side view of a 1st casing. The side view of a 2nd casing. The side view of a piping joint. The longitudinal cross-sectional view of a piping joint. The figure which shows the state by which the three-way valve for drainage and the piping joint were connected by the discharge piping. The figure which looked at the 2nd casing of the piping joint concerning modification C from the slanting upper part. It is a piping joint concerning modification C, Comprising: (a) The schematic longitudinal cross-sectional view of a piping joint, (b) The schematic longitudinal cross-sectional view of a 2nd casing (equivalent to the XVI-XVI cross section of FIG. 15).

  Hereinafter, a hot water storage type hot water supply apparatus including a hot water storage unit 10 having a pipe joint (corresponding to a drain pipe joint) 70 according to an embodiment of the present invention will be described with reference to the drawings. The following embodiments are specific examples of the present invention and do not limit the technical scope of the present invention.

(1) Configuration of a hot water storage type hot water supply system A hot water storage type hot water supply apparatus is configured to supply high-temperature water (hereinafter referred to as normal temperature water) that has been boiled by heating means (heat pump unit 100 in this embodiment). Hot water) or water is stored in a hot water storage tank 11 provided in the hot water storage unit 10, and the stored hot water and water (hereinafter referred to as hot water) are supplied to the bathtub 18 according to the operation of the user, Or it supplies to supply parts (for example, a shower, a kitchen faucet, etc.) 16 other than bathtub 18.

  The hot water storage type hot water supply apparatus mainly includes a heat pump unit 100, a hot water storage unit 10, and a control device (not shown) (see FIG. 1). Below, the various components with which a hot water storage type hot-water supply apparatus is provided are demonstrated.

(2) Configuration of Heat Pump Unit The heat pump unit 100 functions by obtaining electric power as a heat source device for producing hot water. Specifically, the heat pump unit 100 includes a refrigerant circuit in which a refrigerant (for example, a carbon dioxide refrigerant) circulates. In the refrigerant circuit, the discharge side of the compressor, the refrigerant side of the water heat exchanger, the high pressure side in the internal heat exchanger, the expansion valve, the air heat exchanger, the low pressure side in the internal heat exchanger, the suction of the compressor The devices are connected in this order, and the refrigerant is circulated inside.

  The internal heat exchanger exchanges heat between the refrigerant flowing through the high-pressure side pipe and the refrigerant flowing through the low-pressure side pipe. The water heat exchanger has a refrigerant pipe, and is between the high-temperature refrigerant discharged from the compressor and flowing into the refrigerant pipe, and the hot water flowing into the water pipe 25 from the hot water storage pipe 21 of the hot water storage unit 10 described later. Heat exchange. By the heat exchange in the water heat exchanger, the refrigerant passing through the refrigerant pipe is cooled, and the hot water passing through the water pipe 25 is heated, so that the temperature of hot water flowing into the hot water return pipe 22 of the hot water storage unit 10 to be described later is increased. Can be raised. As a result, hot water having a temperature higher than the temperature of the hot water flowing through the hot water outlet pipe 21 flows through the hot water return pipe 22 of the hot water storage unit 10.

  Further, the heat pump unit 100 includes various sensors. Examples of the various sensors include sensors that detect temperature and pressure related to the refrigerant. Specifically, various sensors include a suction pressure sensor that detects refrigerant pressure that passes through the suction side of the compressor, a suction thermistor that detects refrigerant temperature that passes through the suction side of the compressor, and passes through the discharge side of the compressor. Discharge pressure sensor for detecting refrigerant pressure to be discharged, discharge thermistor for detecting refrigerant temperature passing through the discharge side of the compressor, and a refrigerant thermistor after water heat exchange for detecting the temperature of the refrigerant cooled by passing through the water heat exchanger There are an outside air thermistor that detects the temperature of the outside air, and a refrigerant thermistor after the air heat exchange that detects the temperature of the refrigerant after being heated in the air heat exchanger. It is provided as possible.

(3) Configuration of Hot Water Storage Unit The hot water storage unit 10 is a device that heats and stores normal temperature water supplied from outside such as city water by heat obtained from the heat pump unit 100 and stores it. Further, as shown in FIG. 1, the hot water storage unit 10 includes a hot water storage tank 11, a hot water circulation circuit 20, a memorial heat exchanger 12, a memorial heat source circuit 30, a memorial heat utilization circuit 40, a hot water supply piping system 50, and drainage. A three-way valve 60 and a pipe joint 70 are provided.

  FIG. 2 is an external view of the hot water storage unit 10. As shown in FIG. 2, the hot water storage unit 10 includes a casing 13 having a substantially rectangular parallelepiped shape. The casing 13 includes a top plate 13a, a front panel 13b, a first side plate 13c, a second side plate 13d, a rear plate 13e, a front plate 13f, and a bottom plate 13g. Further, the hot water storage tank 11, a part of the hot water circulation circuit 20, the remedy heat exchanger 12, the remedy heat source circuit 30, the remedy use circuit 40, a part of the hot water supply piping system 50, and a part of the pipe joint 70. Is housed in the casing 13 (see FIG. 1).

(3-1) Hot water storage tank The hot water storage tank 11 is a tank for storing hot water and water obtained by heat derived from the heat pump unit 100 in advance before being used by a user. The hot water storage tank 11 is formed in a cylindrical shape, for example, and can store hot water therein.

  Further, a water temperature thermistor T1 is disposed at the upper part of the hot water storage tank 11, and a plurality of remaining hot water amount thermistors T2 to T6 are disposed on the side surface of the hot water storage tank 11 at predetermined intervals across the top and bottom. Has been. The water temperature thermistor T1 and the remaining hot water amount thermistors T2 to T6 measure the temperature of hot water in the hot water storage tank 11. Further, the water temperature thermistor T1 and the remaining hot water amount thermistors T2 to T6 are respectively disposed at height positions corresponding to the remaining hot water amount of the hot water storage tank 11.

(3-2) Hot Water Circulation Circuit The hot water circulation circuit 20 is a circuit for transmitting the heat obtained by the heat pump unit 100 to the hot water in the hot water storage tank 11, and includes a hot water storage pipe 21, a hot water return pipe 22, A boiling pump P1 and a boiling three-way valve 24 are provided.

  The hot water storage pipe 21 is a pipe connecting the vicinity of the lower end of the hot water storage tank 11 and the upstream end of the water pipe 25 of the water heat exchanger located in the heat pump unit 100. The hot water storage pipe 21 is connected to the first hot water storage pipe 21a that connects the vicinity of the lower end of the hot water storage tank 11 and the three-way valve 60 for drainage, and the second that connects the three-way valve 60 for drainage and the heat pump circulation outlet 10a. It includes a hot water storage pipe 21b, and a third hot water storage pipe 21c that connects the heat pump circulation outlet 10a and the upstream end of the water pipe 25 of the water heat exchanger. A boiling pump P1 is provided in the middle of the second hot water storage pipe 21b. The boiling pump P1 is a pump for sending hot water from the drainage three-way valve 60 toward the heat pump circulation outlet 10a.

  The hot water storage return pipe 22 is a pipe that connects the downstream end of the water pipe 25 of the water heat exchanger to the vicinity of the upper end and the lower end of the hot water storage tank 11. The hot water storage return pipe 22 includes a first hot water storage return pipe 22a connecting the downstream end of the water pipe 25 of the water heat exchanger and the heat pump circulation return port 10b, a heat pump circulation return port 10b, a boiling three-way valve 24, and the like. The second hot water storage return pipe 22b for connecting the hot water, the third hot water return pipe 22c for connecting the boiling three way valve 24 and the upper end of the hot water storage tank 11, and the boiling three way valve 24 and the lower end of the hot water storage tank 11 are connected. And a fourth hot water storage return pipe 22d.

  The boiling three-way valve 24 is an electric valve whose opening degree is adjusted by an electric motor. The boiling three-way valve 24 adjusts the opening of the valve body under the control of the control device, so that hot water flowing from the first hot water storage return pipe 22a side to the second hot water storage return pipe 22b side is returned to the third hot water storage return. It flows into the pipe 22c and flows out into the hot water storage tank 11 from the upper end of the hot water storage tank 11, or flows into the fourth hot water storage return pipe 22d and flows out into the hot water storage tank 11 from the lower end of the hot water storage tank 11.

  In the hot water storage circulation circuit 20, the boiling pump P <b> 1 is driven by the control of the control device, so that the hot water having a low temperature existing below the hot water in the hot water storage tank 11 flows out to the hot water outlet pipe 21. The temperature is raised by passing through the water pipe 25 of the water heat exchanger, and returned to the vicinity of the upper end of the hot water storage tank 11 or the vicinity of the lower end of the hot water storage tank 11 via the hot water storage return pipe 22. Thereby, the temperature of the hot water in the hot water storage tank 11 can be made comparatively high.

(3-3) Three-way valve for drainage As shown in FIGS. 3 and 4, the three-way valve 60 for drainage includes a valve body 61, a valve body 62 accommodated in the valve body 61, and the state of the valve body 62. And an operation unit 63 for adjusting the valve opening degree. The valve body 61 includes a connecting portion 61b for connecting the downstream end portion of the first hot water storage pipe 21a, a connecting portion 61c for connecting the upstream end portion of the second hot water storage pipe 21b, and a discharge described later. And a connecting portion 61a for connecting the upstream end portion of the pipe 80. The operation unit 63 includes a handle 63a and a shaft 63b connected to the handle 63a. The valve body 62 is connected to a shaft 63 b, and opens and closes a flow path of hot water flowing from the hot water storage tank 11 toward the pipe joint 70 when the operation unit 63 is manually operated by a user or the like. Specifically, the valve body 62 is operated in the first state (FIG. 5a) in which the first hot water storage pipe 21a and the second hot water storage pipe 21b communicate with each other as shown in FIG. Reference), a second state in which the downstream end of the first hot water storage pipe 21a is closed (see FIG. 5b), and a third state in which the first hot water storage pipe 21a and the discharge pipe 80 are communicated (see FIG. 5c). And switch to. When the valve body 62 is in the first state, the flow of hot water flowing from the first hot water storage outlet pipe 21a side to the discharge pipe 80 is closed, and the hot water flowing from the first hot water storage pipe 21a side is closed. Flows out to the second hot water storage pipe 21b side. When the valve body 62 is in the third state, the flow of hot water flowing from the first hot water storage pipe 21a side to the second hot water storage pipe 21b is closed, and the first hot water storage pipe 21a side is closed. The hot water that has flowed from the outlet flows out to the discharge pipe 80 side and heads toward the drain port 74. Furthermore, when the valve body 62 takes the second state, the hot water flowing from the first hot water storage pipe 21a side flows from the flow path toward the discharge pipe 80 and the first hot water storage pipe 21a side. The flow path of the hot water toward the second hot water storage pipe 21b is blocked, and the hot water flowing from the first hot water storage pipe 21a side does not flow out to the second hot water storage pipe 21b and the discharge pipe 80. In addition, the three-way valve 60 for drainage is adjusted so that the valve body 62 takes the first state during normal time (including the time of boiling operation).

  Further, the drainage three-way valve 60 has the mounting plate 19 so that a part of the valve body 61 and the shaft 63b is located inside the casing 13 and the other part of the handle 63a and the shaft 63b is located outside the casing 13. And is fixed to the front plate 13f (see FIGS. 4, 6, 7 and 8).

(3-4) Remembrance Heat Exchanger Remembrance heat exchanger 12 includes heat source pipe 12a through which hot water in hot water storage tank 11 circulates, and utilization pipe through which hot water or water circulated in bathtub 18 outside casing 13 circulates. 12b. In the memorial heat exchanger 12, the temperature of hot water or water flowing through the use pipe 12b is increased by causing heat exchange between hot water flowing through the heat source pipe 12a and hot water or water flowing through the use pipe 12b. Can do.

(3-5) Remembrance heat source circuit The recuperation heat source circuit 30 uses the temperature of hot water or water stored in the bathtub 18 outside the casing 13 and the heat of hot water stored in the hot water storage tank 11. Then, it is a circuit on the heat source supply side for further raising. The memorial heat source circuit 30 mainly includes a heat source forward pipe 31, a heat source return pipe 32, and a heat source pump P3.

  The heat source forward pipe 31 connects the vicinity of the upper end portion of the hot water storage tank 11 and the upstream end portion of the heat source pipe 12 a in the tracking heat exchanger 12. Further, a check valve B1 for preventing a back flow of hot water flowing from the hot water storage tank 11 side is disposed in the heat source forward pipe 31. The check valve B1 is disposed between the hot water storage tank 11 of the heat source forward pipe 31 and the branch point N1. The heat source return pipe 32 connects the downstream end of the heat source pipe 12 a in the tracking heat exchanger 12 and the vicinity of the lower end of the hot water storage tank 11. The heat source pump P <b> 3 is disposed in the middle of the heat source return pipe 32.

  In the remedy heat source circuit 30, the heat source pump P <b> 3 is driven by the control of the control device, so that the hot water existing in the upper part of the hot water in the hot water storage tank 11 flows out to the heat source forward pipe 31 to be remedied. The temperature is lowered by passing through the heat source pipe 12 a in the heat exchanger 12, and returned to the vicinity of the lower end of the hot water storage tank 11 through the heat source return pipe 32.

  In addition, the remedy heat source circuit 30 includes a first drain pipe 34 for guiding high-temperature expanded water generated during the boiling operation to the drain port 74. The first drain pipe 34 is branched and connected to a branch point N1 of the heat source forward pipe 31 and is connected to a first receiving portion 75 of a pipe joint 70 described later. In the present embodiment, the first drain pipe 34 is a rubber hose, but is not limited thereto, and the first drain pipe may be any of metal pipe, resin pipe, and tube. The first drain pipe 34 is provided with a negative pressure operated relief valve 34a. When the water pressure in the hot water storage tank 11 is less than a predetermined water pressure, the negative pressure operation type relief valve 34 a closes the valve body, and the hot water in the hot water storage tank 11 passes through the first drain pipe 34 and is drained. It is forbidden to be discharged out of the hot water storage unit 10 from 74. On the other hand, when the water pressure in the hot water storage tank 11 is equal to or higher than a predetermined water pressure, the valve body is opened, and hot water (expanded water) in the hot water storage tank 11 passes through the first drain pipe 34 and the hot water storage unit 74. 10 is discharged outside.

(3-6) Remembrance Utilization Circuit The remembrance utilization circuit 40 is a circuit for obtaining the heat of the hot water stored in the hot water storage tank 11 via the memorial heat source circuit 30. The memorial use circuit 40 mainly includes a use forward pipe 41, a use return pipe 42, a use pump P2, external pipes 43 and 45, and a bathtub connection adapter 44.

  One end of the use outlet pipe 41 is connected to the external pipe 43 via the full circulation return port 10c. In addition, the other end of the use pipe 41 is connected to the upstream end of the use pipe 12 b in the tracking heat exchanger 12. Further, the use pipe 41 is provided with a bath thermistor T7 for detecting the temperature of the passing hot water or water. Furthermore, the usage pump P2 is provided in the middle of the usage outlet pipe 41.

  One end of the use return pipe 42 is connected to the external pipe 45 through the full circulation outlet 10d. The other end of the utilization return pipe 42 is connected to the downstream end of the utilization pipe 12 b in the tracking heat exchanger 12.

  The external pipe 43 connects the use pipe 41 and the bathtub connection adapter 44. The external pipe 45 connects the use return pipe 42 and the bathtub connection adapter 44. Moreover, the bathtub connection adapter 44 is arrange | positioned in the bathtub 18, and makes hot water flow out in the bathtub 18, or takes in hot water or water from the bathtub 18. FIG. The external pipes 43 and 45 and the bathtub connection adapter 44 are disposed outside the casing 13 as shown in FIG.

  In the memorial use circuit 40, the use pump P2 is driven by the control of the control device, so that the hot water or water in the bathtub 18 flows out from the external pipe 43 side to the use pipe 41 side via the bathtub connection adapter 44, The temperature is increased by passing through the use pipe 12 b in the tracking heat exchanger 12, and is returned to the bathtub 18 through the use return pipe 42 and the external pipe 45. Thereby, the temperature of the hot water or water of the bathtub 18 can be raised, and additional cooking can be performed.

(3-7) Hot-water supply piping system The hot-water supply piping system 50 is a path for using hot water stored in the hot water storage tank 11 while receiving supply of water from external city water or the like, A hot water outlet pipe 52, a supply pipe 53, a hot water supply mixing valve 54, and a hot water beam mixing valve 55 are provided.

  The water supply pipe 51 is a pipe through which water supplied from outside city water or the like flows, and includes a first water supply pipe 51a, a second water supply pipe 51b, and a third water supply pipe 51c.

  The first water supply pipe 51 a connects the external water supply pipe 17 through which water supplied from a water source outside the hot water storage unit 10 flows and the hot water supply mixing valve 54. The external water supply pipe 17 and the first water supply pipe 51a are connected via the water supply connection port 10e. The first water supply pipe 51a guides normal temperature water supplied from an external water source to the hot water supply mixing valve 54 via the branch points N2 and N3. The first water supply pipe 51a has a strainer with a check valve between the water supply connection port 10e and the branch point N2, and a pressure reducing valve for reducing the water pressure of the water flowing in from the water supply connection port 10e to a predetermined water pressure. R is disposed. The strainer with a check valve includes a strainer S for removing dust contained in water flowing in from the water supply connection port 10e side, and a check valve B2 for preventing reverse flow of water flowing in from the water supply connection port 10e side. Including. Further, a water temperature thermistor T8 that detects the temperature of the water flowing through the first water supply pipe 51a is disposed in the vicinity of the branch point N2 in the first water supply pipe 51a. The first water supply pipe 51a is provided with a check valve B3 between the hot water mixing valve 54 and the branch point N3 for preventing the reverse flow of water flowing from the branch point N3 side.

  The second water supply pipe 51b is branched and connected to the branch point N3 of the first water supply pipe 51a, and connects the first water supply pipe 51a and the hot water beam mixing valve 55. The second water supply pipe 51b guides normal temperature water supplied from an external water source to the hot water mixing valve 55 via the branch points N2 and N3 of the first water supply pipe 51a.

  The third water supply pipe 51c is branched and connected to the branch point N2 of the first water supply pipe 51a, and connects the first water supply pipe 51a and the lower end portion of the hot water storage tank 11. The third water supply pipe 51c guides normal temperature water supplied from an external water source to the vicinity of the lower end of the hot water storage tank 11 through the branch point N2 of the first water supply pipe 51a. The third water supply pipe 51c is provided with a check valve B4 for preventing the backflow of water flowing from the branch point N2 side. The water flowing into the first water supply pipe 51a from the external water supply pipe 17 flows through the third water supply pipe 51c via the branch point N2 and is supplied to the hot water storage tank 11 due to the water pressure. As a result, the hot water storage tank 11 is always kept full.

  The hot water discharge pipe 52 has a first hot water discharge pipe 52 a for supplying hot water in the hot water storage tank 11 to the supply unit 16 that is a supply destination other than the bathtub 18, and a first hot water pipe for supplying hot water in the hot water storage tank 11 to the bathtub 18. 2 hot water discharge pipes 52b.

  The first hot water discharge pipe 52 a connects the upper end portion of the hot water storage tank 11 and the hot water supply mixing valve 54. Further, of the hot water stored in the hot water storage tank 11, hot water having a relatively high temperature that is present near the upper end flows through the first hot water discharge pipe 52 a. The first hot water discharge pipe 52a is provided with a check valve B5 for preventing a back flow of hot water flowing from the hot water storage tank 11 side.

  The second hot water outlet pipe 52b is branched and connected to the branch point N4 of the heat source forward pipe 31, and connects the heat source forward pipe 31 and the hot water mixing valve 55. The second outlet pipe 52b is configured to pass hot water present in the vicinity of the upper end of hot water stored in the hot water storage tank 11 through a part of the heat source forward pipe 31 to a hot water mixing valve 55. Lead to.

  The supply pipe 53 is a pipe through which hot water mixed with normal temperature water flowing through the water supply pipe 51 and hot hot water flowing from the vicinity of the upper end of the hot water storage tank 11 through the hot water discharge pipe 52. Note that hot water having a temperature between the temperature (normal temperature) of the water flowing through the first water supply pipe 51 a and the temperature of hot water existing near the upper end of the hot water storage tank 11 flows in the supply pipe 53. The supply pipe 53 includes a first supply pipe 53 a connected to the hot water mixing valve 54 and a second supply pipe 53 b connected to the hot water mixing valve 55.

  The end of the first supply pipe 53a opposite to the end connected to the hot water supply mixing valve 54 is connected to an external pipe 99 extending from the supply section 16 via the hot water supply connection port 10f. The first supply pipe 53a is provided with a hot water supply amount sensor FLS1 that detects the amount of hot water flowing inside, and a hot water supply thermistor T9 that detects the temperature of hot water flowing through the first supply pipe 53a.

  The end of the second supply pipe 53b opposite to the end connected to the hot water mixing valve 55 is connected to the branch point N5 of the utilization return pipe. In other words, the second supply pipe 53 b bypasses the heat source forward pipe 31 of the tracking heat source circuit 30 and the use return pipe 42 of the tracking use circuit 40.

  The second supply pipe 53b is provided with a hot water quantity sensor FLS2 and a hot water thermistor T10. The hot water volume sensor FLS2 detects the amount of hot water flowing through the second supply pipe 53b. The hot water thermistor T10 is for detecting the temperature of the hot water flowing through the second supply pipe 53b. Furthermore, a hot water solenoid valve SV included in the composite water valve and two check valves B6 and B7 are disposed in the second supply pipe 53b. The hot water solenoid valve SV adjusts the amount of hot water flowing into the use return pipe 42 by adjusting the opening of the valve body by an electric motor. The check valves B6 and B7 are arranged so as to sandwich the hot water volume sensor FLS2. The check valves B6 and B7 prevent backflow of hot water flowing through the second supply pipe 53b toward the hot water mixing valve 55 or backflow of hot water from the bathtub 18.

  A second drain pipe 53c for guiding hot water flowing through the second supply pipe 53b to the drain port 74 is branched and connected to the branch point N6 of the second supply pipe 53b. In the present embodiment, the second drain pipe 53c is a rubber hose, but is not limited to this, and the second drain pipe may be any of metal pipe, resin pipe, and tube. In the present embodiment, the branch point N6 is located between the check valve B6 and the hot water volume sensor FLS2. Furthermore, the 2nd drain pipe 53c is connected with the 2nd receiving part 76 of the piping coupling 70 mentioned later. The second drain pipe 53c is provided with a drain valve 59 included in the composite water valve. The drain valve 59 discharges hot water accumulated in the second supply pipe 53b from the drain port 74 to the outside of the casing 13 through the second drain pipe 53c when the valve body is opened. The drain valve 59 is configured electrically, and the opening degree of the valve body is adjusted by the control of the control device. In the present embodiment, the opening degree of the drain valve 59 is adjusted by the control device, but the present invention is not limited to this, and the drain valve 59 is configured manually, and the opening degree of the drain valve 59 is manually adjusted. May be adjusted.

  The hot water mixing valve 54 is an electric valve whose opening degree is adjusted by an electric motor. The hot water supply mixing valve 54 adjusts the opening degree of the valve body under the control of the control device, thereby mixing hot water from the first hot water discharge pipe 52a and water from the first water supply pipe 51a at a desired mixing ratio. Then, the mixed hot and cold water flows out to the supply unit 16 through the first supply pipe 53a and the external pipe 99.

  The hot water mixing valve 55 is an electric valve whose opening degree is adjusted by an electric motor. The hot water mixing valve 55 adjusts the opening degree of the valve body under the control of the control device, so that the hot water from the second outlet pipe 52b and the water from the second water supply pipe 51b are mixed at a desired mixing ratio. After mixing, the mixed hot and cold water flows out to the bathtub 18 through a part of the second supply pipe 53b and the utilization return pipe 42.

(3-8) Piping Joint The piping joint 70 is configured to collect all drainage generated in the hot water storage unit 10 and to discharge the gathered drainage from one drain port 74 to the outside of the casing 13. Specifically, the pipe joint 70 includes a discharge pipe 80 through which hot water (drainage) flows from the hot water storage tank 11, a first drain pipe 34 through which expanded water (drainage) flows from the heat source forward pipe 31 extending from the hot water storage tank 11, and This is a pipe joint to which a second drain pipe 53c through which hot water (drainage) flows from the second supply pipe 53b through a heat source forward pipe 31 extending from the hot water storage tank 11 is connected. In the present embodiment, the pipe joint 70 is configured by connecting the first casing 70a and the second casing 70b with screws or the like (see FIGS. 9, 10, and 11). Moreover, in this embodiment, the 1st casing 70a and the 2nd casing 70b are comprised with the same raw material. Furthermore, in this embodiment, the three-way valve 60 for drainage and the pipe joint 70 are separate members, and the valve body 62 of the three-way valve 60 for drainage and the drainage port 74 of the pipe joint 70 are separated by 50 mm or more. Designed to be.

  Moreover, the piping joint 70 is provided with the receiving part 71, the discharge part 72, and the intermediate part 73, as shown in FIG.12 and FIG.13. The pipe joint 70 is mainly fixed to the bottom plate 13g so that the receiving part 71 and the intermediate part 73 are located inside the casing 13 and the discharge part 72 is located outside the casing 13 (see FIGS. 6 and 8). ). As a result, the drain port 74 formed in the discharge part 72 is exposed outside the casing 13.

  The receiving unit 71 includes a first receiving unit 75, a second receiving unit 76, and a third receiving unit 77. The first receiving portion 75 is formed with a first connection port 75a for connecting the end of the first drain pipe 34, and the first receiving portion 75 is expanded water (hot water) flowing through the first drain pipe 34. ). The first receiving part 75 has a first water channel 75 b through which the expanded water (hot water) flowing through the first drain pipe 34 passes. The second receiving part 76 is formed with a second connection port 76a for connecting the end of the second drain pipe 53c, and the second receiving part 76 receives hot water flowing through the second drain pipe 53c. Moreover, the 2nd receiving part 76 has the 2nd water channel 76b through which the hot water which flows through the 2nd drain pipe 53c passes. In the present embodiment, the first receiving portion 75 and the second receiving portion 76 open in a substantially vertical direction as shown in FIG.

  The third receiving portion 77 is formed with a third connection port 77a for connecting an end portion of the discharge pipe 80 connected to the three-way drain valve 60. The third receiving portion 77 is connected to the discharge pipe 80. Accept hot water flowing through. Further, the third receiving portion 77 has a third water passage 77b through which hot water of the hot water storage tank 11 flowing from the discharge pipe 80 side through the drainage three-way valve 60 passes. In the present embodiment, the third connection port 77a of the third receiving portion 77 opens in a substantially horizontal direction as shown in FIG.

  Here, the discharge pipe 80 connecting the three-way valve 60 for drainage and the pipe joint 70 is a copper pipe, and has a curved portion 81 curved in a substantially S shape as shown in FIG. Further, the discharge pipe 80 is disposed substantially horizontally above the bottom plate 13g of the casing 13 so that water does not accumulate inside. In the present embodiment, the curved portion 81 of the discharge pipe 80 is curved in a substantially S shape, but is not limited to this. For example, the curved portion 81 is curved in a substantially U shape. Also good. Further, in the present embodiment, the discharge pipe 80 is disposed substantially horizontally on the upper side of the bottom plate 13g. However, the arrangement of the discharge pipe 80 is not limited to this as long as water does not accumulate in the discharge pipe 80. For example, the discharge pipe 80 may be disposed so as to be inclined so that water easily flows from the drain three-way valve 60 side toward the discharge pipe 80 side.

  The discharge portion 72 is formed with a drain port 74 for discharging hot water received from the first receiving portion 75, the second receiving portion 76 and the third receiving portion 77 to the outside of the casing 13. Moreover, the discharge part 72 has the 4th waterway 72b through which the waste_water | drain (hot water and expansion water) discharged | emitted outside the hot water storage unit 10 through the drain port 74 passes, as shown in FIG. In the present embodiment, as shown in FIG. 13, the drain port 74 is positioned so as not to face the first connection port 75a, the second connection port 76a, and the third connection port 77a.

  As shown in FIGS. 12 and 13, the intermediate portion 73 is interposed between the first receiving portion 75 and the second receiving portion 76 and the discharge portion 72 and extends in a substantially horizontal direction. In addition, the intermediate portion 73 has a fifth water channel 78 through which drainage discharged from the drainage port 74 flows. The fifth water channel 78 is continuous with the first water channel 75b, the second water channel 76b, the third water channel 77b, and the fourth water channel 72b, and the first water channel 75b, the second water channel 76b, the third water channel 77b, and the fourth water channel 72b. The water channel 72b and the fifth water channel 78 constitute a drainage channel that reaches the drainage port 74 from the first connection port 75a, the second connection port 76a, and the third connection port 77a. In the following, for convenience of explanation, in the fifth water channel 78, the portion facing the drain port 74 is referred to as the first portion 78 a of the fifth water channel 78, and the portion not facing the drain port 74 is the second channel of the fifth water channel 78. The portion 78b (corresponding to a water conduit) is referred to.

  Here, the bottom surface F of the second portion 78b of the fifth water channel 78 is, as shown in FIG. 13, only a predetermined angle (2.5 degrees in this embodiment) with respect to the horizontal plane so that the discharge portion 72 side is lowered. Inclined. The predetermined angle is preferably 1 degree or more and 4 degrees or less, and more preferably 2 degrees or more and 4 degrees or less.

  Moreover, the intermediate part 73 has the contact part 73a which protruded below (refer FIG.12 and FIG.13). The pipe joint 70 is fixed to the bottom plate 13g so that the contact portion 73a and the bottom plate 13g are in contact with each other. For this reason, most of the intermediate portion 73 is disposed so as not to contact the bottom plate 13g.

  Since the pipe joint 70 has such a configuration, when the operation portion 63 of the drainage three-way valve 60 is operated and the valve body 62 is switched to the third state, the first hot water storage pipe 21a from the hot water storage tank 11 is operated. The hot water that has flowed out to the outside is discharged from the drain port 74 to the outside of the hot water storage unit 10 through the discharge pipe 80, the third water passage 77b, and the fifth water passage 78 mainly through the first portion 78a and the fourth water passage 72b. The expanded water generated during the boiling operation flows through the first drain pipe 34 and the first water channel 75b, flows from the second portion 78b of the fifth water channel 78 toward the first portion 78a, and passes through the fourth water channel 72b. The hot water storage unit 10 is discharged from the drain port 74. Further, the hot water flowing through the second supply pipe 53 b flows through the second drain pipe 53 c and the second water channel 76 b by controlling the drain valve 59 and opening the valve body, and the second portion 78 b of the fifth water channel 78. From the drain port 74 to the outside of the hot water storage unit 10 through the fourth water passage 72b.

(4) Configuration of the control device The control device is based on the detection results of the thermistors T1 to T10 and the water volume sensors FLS1, FLS2, etc., and the valves 54, 55, 59, SV, the heat pump unit 100 and the pumps P1, P2, and so on. Control various devices such as P3. The control device is connected to a controller (not shown). The controller accepts user operations.

  Further, for example, when the controller is operated, the control device executes a boiling operation in which hot water in the hot water storage tank 11 is heated by a water heat exchanger provided in the heat pump unit 100. When performing the boiling operation, the control device drives the compressor of the heat pump unit 100 and the boiling pump P1 of the hot water storage unit 10. As a result, the refrigerant circulates in the refrigerant circuit in the heat pump unit 100, and the hot water in the hot water storage unit 10 circulates in the hot water storage circuit 20 of the hot water storage unit 10, thereby raising the temperature of the hot water in the hot water storage unit 10. (Heating) is performed.

(5) Features (5-1)
In the present embodiment, the bottom surface F of the second portion 78b of the fifth water channel 78 is inclined by a predetermined angle (2.5 degrees) with respect to the horizontal plane so that the discharge portion 72 side is lowered. For this reason, the expanded water or hot water flowing through the second portion 78 b of the fifth water channel 78 can easily flow toward the drain port 74. Thereby, since it becomes difficult for water to accumulate in the 5th water channel 78, a possibility that water may freeze in the 5th water channel 78 can be reduced. As a result, it is possible to reduce the possibility that water is repeatedly frozen and thawed in the fifth water channel 78.

  As a result, the possibility of deterioration of the pipe joint 70 can be reduced.

  By the way, when the water in the fifth water channel 78 is frozen and ice is generated, the water further touches the generated ice, so that the ice grows in the fifth water channel 78 and the fifth water channel 78 is blocked. There is a fear. Therefore, in the present embodiment, the fifth water channel 78 is inclined by a predetermined angle (2.5 degrees) with respect to the horizontal plane so that the bottom surface F of the second portion 78b of the fifth water channel 78 is lowered on the discharge portion 72 side. The expanded water or hot water flowing through the second portion 78 b of the 78 becomes easy to flow toward the drain port 74, and the water does not easily accumulate in the fifth water channel 78. As a result, the possibility of water freezing in the fifth water channel 78 can be reduced, so that ice is generated in the fifth water channel 78 or a phenomenon that ice grows in the fifth water channel 78 occurs. The risk of doing so can be reduced.

  Thereby, the possibility that the fifth water channel 78 is blocked can be reduced.

(5-2)
Generally, the waste water generated in the hot water storage unit is collected in one place and discharged from the hot water storage unit. For this reason, when there are a plurality of drain pipes through which drainage from the hot water storage tank flows, it is necessary to collect the plurality of drain pipes at one place when the hot water storage unit is constructed locally.

  Here, in the present embodiment, the first drain pipe 34 is connected to the first receiving section 75, the second drain pipe 53 c is connected to the second receiving section 76, and the discharge pipe 80 is connected to the third receiving section 77. Is connected. For this reason, waste water flowing from a plurality of pipes can be discharged to the outside of the hot water storage unit 10 from one drain port 74. Therefore, in this hot water storage unit 10, it is possible to facilitate the connection work of the piping through which drainage from the hot water storage tank 11 flows.

(5-3)
In the present embodiment, the first receiving portion 75 is connected to the first drain pipe 34 through which the expansion water generated during the boiling operation in which the hot water in the hot water storage tank 11 is heated is flowing. For this reason, every time the boiling operation is performed, expanded water having a high temperature flows through the second portion 78 b of the fifth water channel 78. Here, in the present embodiment, since the bottom surface F of the second portion 78b of the fifth water channel 78 is inclined by a predetermined angle with respect to the horizontal surface, the water is less likely to freeze in the fifth water channel 78. Even if the expansion water flows through the second portion 78b of the five water channels 78, it is possible to reduce the possibility that the deterioration of the pipe joint 70 is promoted.

(5-4)
In the present embodiment, the bottom surface F of the second portion 78b of the fifth water channel 78 is inclined by 2.5 degrees with respect to the horizontal plane so that the discharge portion 72 side is lowered. For this reason, for example, even when the bottom plate 13g of the casing 13 is not installed horizontally at the time of on-site construction of the hot water storage unit 10, the possibility that water will accumulate in the fifth water channel 78 can be reduced.

(5-5)
In the present embodiment, the contact portion 73a is provided so that most of the intermediate portion 73 does not contact the bottom plate 13g. Thus, the freezing of water in the drainage channel can be suppressed by reducing the contact area between the bottom plate 13g and the pipe joint 70.

(6) Modification (6-1) Modification A
In the above embodiment, the contact portion 73a is provided so that most of the intermediate portion 73 does not contact the bottom plate 13g. In addition, a sealing material may be disposed between the bottom plate 13g and the contact portion 73a.

(6-2) Modification B
In the said embodiment, the 1st casing 70a and the 2nd casing 70b are comprised with the same raw material. Instead, at least the second casing may be made of a material that is difficult to freeze.

(6-3) Modification C
FIG. 15 is a perspective view of the second casing 170b. FIG. 16A is a schematic longitudinal sectional view of the pipe joint 170 cut in the longitudinal direction. FIG. 16B is a longitudinal sectional view of the second casing 170b corresponding to the XVI-XVI section of FIG. In FIG. 16A, the configuration included in the first casing 70a of the above-described embodiment is the same as that of the above-described embodiment, and thus the same reference numerals as those of the above-described embodiment are given.

  In the above embodiment, the fifth water channel 78 extends in the longitudinal direction of the pipe joint 70, and the first portion 78 a of the fifth water channel 78 is located at the longitudinal end of the fifth water channel 78. And the bottom face F of the 2nd part 78b inclines only the predetermined angle with respect to the horizontal surface so that the discharge part 72 side, ie, the 1st part 78a side, may become low. In this pipe joint 70, the bottom surface F of the second portion 78 b of the fifth water channel 78 is inclined along the longitudinal direction of the fifth water channel 78 so that the first portion 78 a side is lowered. The direction of the water flow at the same direction as the longitudinal direction of the fifth water channel 78 is the same. For this reason, the expansion water or hot water flowing from the first water channel 75b or the second water channel 76b flows along the longitudinal direction (flow direction) of the fifth water channel 78 through the second portion 78b of the fifth water channel 78, and the first It reaches the portion 78 a and the discharge portion 72 and is discharged from the drain port 74. Thus, in the pipe joint 70 of the above embodiment, the bottom surface F of the second portion 78b of the fifth water channel 78 is inclined along the longitudinal direction of the fifth water channel 78 so that the first portion 78a side is lowered. As a result, the expanded water or hot water flowing through the second portion 78 b of the fifth water channel 78 is likely to flow toward the drain port 74, and water does not easily accumulate in the fifth water channel 78.

  In addition, in order to further reduce the possibility of water collecting in the fifth water channel, the bottom surface of the second portion of the fifth water channel may be further inclined in a predetermined direction.

  For example, the bottom surface of the second portion of the fifth water channel may be formed in a mortar shape so as to be inclined downward toward the discharge portion (drain port). As an example, for example, as shown in FIGS. 15 and 16, the bottom surface F of the second portion 178 b of the fifth water channel 178 is lowered along the flow direction X of the water discharged from the drain port 174. It may be inclined and may be inclined so that the center F1 side in the direction intersecting the flow direction X is lower than the end F2 side.

  In the fifth water channel 178, the first portion 178a facing the drain port 174 is located at the longitudinal end 178c of the fifth water channel 178, as shown in FIGS.

  The bottom surface F of the second portion 178b of the fifth water channel 178 has a portion close to the first portion 178a, that is, a portion close to the discharge portion 172 (drain port 174), as shown in FIG. It is inclined by a predetermined angle with respect to the horizontal plane so as to be lower than a portion far from the one portion 178a, that is, a portion far from the discharge portion 172 (drain port 174). Therefore, the longitudinal direction of the fifth water channel 178 and the water flow direction X in the fifth water channel 178 are the same direction. That is, the bottom surface F of the second portion 178 b of the fifth water channel 178 is inclined so as to become lower along the flow direction X of the water discharged from the drain port 174.

  Furthermore, the bottom surface F of the second portion 178b of the fifth water channel 178 is, as shown in FIG. 16 (b), in the longitudinal direction of the fifth water channel 178, that is, in the center intersecting the flow direction X shown in FIG. The portion F1 is inclined at a predetermined angle with respect to the horizontal plane so that the side of the portion F1 is lower than the ends F2 and F2. For this reason, as shown in FIG.16 (b), as for the bottom face F of the 2nd part 178b of the 5th water channel 178, both ends F2, F2 side is thicker than the center part F1 side.

  In this way, the bottom surface F of the second portion 178b of the fifth water channel 178 is inclined so as to be lowered along the flow direction X of the water discharged from the drain port 174, and intersects the flow direction X. When the center portion F1 side in the direction to be inclined is lower than the both end portions F2 and F2 sides, for example, when expansion water or hot water is dripped from the first water channel 75b or the second water channel 76b to the end portion F2. Moreover, the dripped expansion water or hot water is easy to flow from the end F2 toward the center F1. For this reason, the expanded water or hot water flowing through the second portion 178b of the fifth water channel 178 is more likely to flow toward the drain port 174 than the pipe joint 70 of the above embodiment, and water is collected in the fifth water channel 178. It becomes difficult to. As a result, the possibility of water freezing in the fifth water channel 178 can be reduced, so that a phenomenon that ice is generated in the fifth water channel 178 or ice grows in the fifth water channel 178 occurs. The risk of doing so can be reduced.

  Thereby, the possibility that the fifth water channel 178 is blocked can be reduced.

  Further, the bottom surface F of the second portion 178b of the fifth water channel 178 is inclined so as to be lowered along the flow direction X of the water discharged from the drain outlet 174, and intersects the flow direction X. Since the center portion F1 side of the pipe is inclined so as to be lower than both end portions F2 and F2 sides, for example, when the bottom plate of the casing is not installed horizontally during the on-site construction of the hot water storage unit, the piping of the above embodiment The risk of water collecting in the fifth water channel 178 can be further reduced as compared with the joint 70.

  INDUSTRIAL APPLICABILITY The present invention is an invention of a drainage pipe joint that can reduce the possibility of blocking a water conduit and can reduce the possibility of deterioration, and is effectively applied to equipment installed outdoors.

11 Hot water storage tank 31 Heat source forward pipe (water piping)
34 First drain pipe (drain pipe / first pipe)
53b Second supply pipe (water pipe)
53c Second drain pipe (drain pipe / second pipe)
70 Piping joint (drainage pipe joint)
72 Discharge part 73 Intermediate part 74 Drain port (discharge port)
75 1st receiving part 76 2nd receiving part 77 3rd receiving part (2nd receiving part)
78b 2nd part (water conduit)
80 Discharge pipe (drain pipe / second pipe)

JP 2010-2061 A

Claims (8)

A drainage pipe (34, 53c, 80) through which drainage flows from a hot water storage tank (11) housed in a casing (13) or a water pipe (31, 53b) extending from the hot water storage tank is connected. A drainage pipe joint fixed to the bottom surface (13 g) of
A first receiving portion (75) for receiving water flowing through the drain pipe;
A discharge portion (72) in which a discharge port (74) for discharging water received from the first receiving portion to the outside is formed;
An intermediate portion (73) interposed between the first receiving portion and the discharge portion and extending in a substantially horizontal direction;
With
Said intermediate portion, said water conduit the flow of water discharged from the discharge port and (78b), said intermediate portion contact portion which most in contact with the bottom surface projects downward so as not to contact the bottom surface of the ( 73a), and
The bottom surface (F) of the water conduit is inclined by a predetermined angle with respect to a horizontal plane so that the discharge portion side is lowered,
Drainage pipe joint (70). The first receiving part is connected to the first pipe (34) of the drain pipe,
A second receiving part (76, 77) for receiving water flowing through the second pipe (53c, 80) of the drain pipe different from the first pipe;
The drainage pipe joint according to claim 1. The first receiving portion is disposed so as not to face the discharge portion.
The drainage pipe joint according to claim 2. The first receiving unit receives expanded water generated when the water in the hot water storage tank is heated.
The drainage pipe joint according to any one of claims 1 to 3. The predetermined angle is not less than 1 degree and not more than 4 degrees.
The drainage pipe joint according to any one of claims 1 to 4. The bottom surface of the water conduit is inclined so as to be lower along the flow direction of the water discharged from the discharge port, and the center side in the direction intersecting the flow direction is lower than the end side. Is inclined to be
The drainage pipe joint according to any one of claims 1 to 5. The first receiving portion extends upward;
The discharge part extends downward,
The drainage pipe joint according to any one of claims 1 to 6. The water conduit is formed by connecting a first casing (70a) including the first receiving portion and a second casing (70b) including the discharge portion.
The drainage pipe joint according to any one of claims 1 to 7.

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