JP2012072922A - Drain discharge system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drain discharge system that requires no large-scale construction to form a drain discharge line when exchanging a latent heat recovery type heat source machine and does not damage a bathroom environment owing to drain discharge and drain discharge line installation.SOLUTION: The drain discharge system is provided for discharging drain produced in a heat exchanger for recovering latent heat of a combustion gas, to the side of a bathroom 4. The system includes a heat-source side drain piping 17, an extended drain piping 18, and a draining cross 3 connected to the extended drain piping 18. The draining cross 3 is connected to a drain discharge line downstream of a bathtub draining port 53 in the flow direction of hot water. Thus, the drain discharged from the draining piping is discharged to the drain discharge line downstream of the bathtub draining port 53 through the draining cross 3.

Description

  The present invention relates to a drain discharge system for discharging drain generated in a latent heat recovery type heat exchanger, and more particularly to a drain discharge system using a drain port provided in a bathroom.

  In recent years, global warming has become serious, and it is urgently required to reduce the amount of greenhouse gases (carbon dioxide, methane, etc.) emitted globally. One measure is to save energy in each household. Therefore, the present inventors have focused on suppressing greenhouse gas emissions by spreading a latent heat recovery type heat source machine with high energy efficiency in each household.

  Here, in the latent heat recovery type heat source unit, the temperature of the steam contained in the combustion gas is reduced by exchanging heat with hot water or a heat medium, so that the steam is liquefied to generate drain. In addition, nitrogen and oxygen in the air react with each other by combustion, and nitrogen oxides are generated. Therefore, when the drain generated on the surface side of the heat exchanger is exposed to the combustion gas, nitrogen oxides are formed on the drain. Dissolves acidic (mainly nitric acid). For this reason, this type of heat source device has a built-in neutralizer for neutralizing acidic drain, and the generated drain is neutralized by the neutralizer and then drained to the outside. That is, when a latent heat recovery type heat source device is installed, a drain discharge system is required outside the heat source device.

  However, especially in apartment buildings such as condominiums, heat source machines are often housed in so-called pipe shafts in which all types of piping are accommodated. In such cases, a new drain discharge channel is provided. It can be difficult. For this reason, in apartment houses such as condominiums, it may be impossible to meet the user's desire to install a latent heat recovery type heat source machine.

  Therefore, Patent Documents 1 and 2 disclose a heat source device that discharges drain using an existing channel. That is, in the heat source apparatus of Patent Documents 1 and 2, the drain pipe is connected to the existing bath reheating circuit to form a drain discharge system, and the neutralized drain is caused to flow to the bath reheating circuit at a predetermined timing. It is equipped with a drain discharge system that drains into a bathtub or bathtub pan and then drains into a drain.

JP 2006-300481 A JP 2007-101075 A

  However, in patent document 1, since it drains in a bathtub even if it is temporary, it is not good as a feeling of the bather who uses the bathtub. On the other hand, in Patent Document 2, since it is discharged to the bathtub pan, draining does not directly harm the bather's feelings, but usually the bathtub pan is almost blocked by the bathtub apron or the like. Since it is in the region, dirt mixed in the sewage such as drainage is likely to accumulate, and mold growth due to moisture tends to occur. Therefore, if it is the structure which drains drain to a bathtub pan like patent document 2, there exists a possibility that the sanitary environment in a bathtub pan will deteriorate, a bad smell may generate | occur | produce, and a bathroom environment may be harmed as a result.

Recently, there are bath facilities that do not have bathtub pans.
In the situation where this kind of bath equipment has already been installed, when installing a latent heat recovery type heat source machine, there is a drain discharge system that drains the drain to the bathroom wash area and drains it from the bathroom drain outlet. Conceivable.
However, when such a measure is adopted, a large-scale construction is required, which increases the cost and is to be avoided. Furthermore, since the drain outlet connected to the heat source device is visually recognized in the bathroom, there is a concern that the design of the bathroom may be damaged.

  Therefore, in the present invention, in view of the problems of the prior art, when replacing the latent heat recovery type heat source machine, drain discharge and installation of the drain discharge system are further performed without requiring a large-scale work to form a drain discharge system. Thus, an object of the present invention is to provide a drain discharge system that does not harm the bathroom environment.

  In order to solve the above-mentioned problem, the invention described in claim 1 is a drain discharge system that discharges the drain generated mainly in the heat exchanger that recovers the latent heat of the combustion gas to the bathroom side. It has drain piping for draining and piping connection means for connecting the drain piping on the bathroom side, the bathroom has a bathtub capable of storing hot water, and the hot water stored in the bathtub is a bathtub drain The drainage system is drained through a drainage system, and the pipe connection means is connected to the drainage system downstream of the bathtub drainage in the hot water flow direction, and drains flowing through a drain pipe are drained from the drainage system. It is a drainage discharge system characterized by being drained into the water.

  The drain discharge system of the present invention is an effective system when installing a heat source device including a latent heat recovery type heat exchanger with high energy efficiency in place of an existing heat source device in an apartment house such as an apartment. That is, a pipe connecting means connected to the drain pipe is arranged on the bathroom side, and the pipe connecting means is arranged in the drainage system downstream of the bathtub drainage in the hot water flow direction, so that the drain can be discharged reliably. You can build a system. Specifically, in the present invention, the drain that passes through the drain pipe can be drained directly to the drainage system in which the hot water flows through the downstream side of the bathtub drain by the pipe connecting means. Due to the drainage discharged, problems in the bathroom environment such as bad odors in the bathroom cannot occur.

Moreover, in this invention, since drain piping is extended to a bathroom and it connects to the piping connection means distribute | arranged to the downstream of the bathtub drain, the system which drains drain can be constructed | assembled, Therefore A big construction is not required. That is, it is possible to prevent the cost required for forming the flow path for discharging the drain from being increased more than necessary.
Therefore, according to the present invention, when the latent heat recovery type heat source machine is replaced, a large-scale construction is not required, and the bathroom environment is not harmed by drainage. Moreover, since the flow path for discharging the drain deviates from a position where it can be visually recognized in the bathroom, the bathroom environment is not harmed from the viewpoint of design.

  According to a second aspect of the present invention, the bathtub drainage port is restricted from passing hot water by a drainage plug, and the drainage tap is connected to the bathtub drainage port by a drainage plug moving means that transmits power from the downstream side in the flow direction of the hot water. The pipe connecting means has a flow path for guiding hot water that has passed through the bathtub drain to the merging section side, and at least two communication sections that communicate with the flow path, and the communication section Any one of these functions as an opening through which the drain plug moving means is inserted, and another one communication part can be used as a drain connection part to which a drain pipe is connected. The drain discharge system according to claim 1, wherein the drain discharge system can be used.

According to such a configuration, a so-called known drainage cloth having a communication hole through which the drain plug moving means is inserted can be employed as the pipe connecting means.
Here, the drainage cloth generally refers to a bathtub-side introduction port connected to a bathtub drainage port, a cross-internal channel for guiding hot water introduced from the bathtub-side introduction port, and a cross-internal channel. It has a discharge outlet that discharges the hot and cold water further downstream than the drainage cloth, and one or more communication holes that connect the outside and the flow path in the cloth. On the other hand, force can be transmitted from the downstream side of the bathtub drain. That is, in the drainage cloth, the communication hole, the bathtub side introduction port, and the bathtub drainage port are connected in series, and the drain plug moving means is inserted from the communication hole to the bathtub side introduction port and the bathtub drainage port. By connecting the drain plug moving means and the drain plug, it is possible to transmit a force from the downstream side of the bathtub drain to the drain plug. Thereby, it becomes possible to switch the open / close state of the bathtub drain.
Further, the versatile drainage cloth is provided with two or more communication holes so as to meet the user's request, and the installation position of the drain plug moving means is given a degree of freedom. In practice, the drain plug moving means is inserted only into any one of the communication holes.
Therefore, according to the present invention, if a drainage cloth having two communication holes is provided in an existing bathroom, for example, if the drain pipe is connected to a communication hole that is not in use, the drain is surely and directly provided. Therefore, it can be discharged downstream from the bathtub drain. Thus, in the present invention, even if a drain discharge system is constructed, the cost hardly increases.

  According to a third aspect of the present invention, the drain pipe has a backflow prevention means, and the backflow prevention means is arranged in the middle of the drain pipe or between the drain pipe and the pipe connection means, and is drained or hot water. 3. The drain discharge system according to claim 1, wherein the drainage is prevented from flowing from the downstream side in the flow direction of the drain toward the upstream side. 4.

  According to such a configuration, since the backflow prevention means is disposed in the flow path through which the drain flows, even if “clogging” occurs due to hair or dust downstream from the pipe connection means or the pipe connection means, Does not cause problems such as reverse flow in the drain piping. Thereby, it is possible to prevent the heat source device including the latent heat recovery type heat exchanger from detecting a fault and stopping the combustion operation.

  In the drain discharge system of the present invention, the pipe connecting means is arranged downstream of the bathtub outlet or the washing outlet of the bathroom, and the drain pipe is connected to the pipe connecting means, so that the drain is surely discharged without harming the bathroom environment. can do. Moreover, since no large-scale construction is required, the cost does not increase more than necessary.

It is an operation principle figure showing a heat source machine provided with a latent heat recovery type secondary heat exchanger which can make a drain discharge system concerning an embodiment of the present invention function. It is a perspective view which shows the condition which installed the drainage cloth of the substance in the bathroom. It is a conceptual diagram which shows the flow path in the cloth of the drainage cloth of FIG. It is a disassembled perspective view which shows the drainage cloth of FIG. It is the perspective view which looked at the waste_water | drain side adapter shown in FIG. 4 from another angle. It is a conceptual diagram of the cross section which shows the attachment condition of the drain plug movable wire. It is a perspective view which shows the modification of a drainage cloth. It is a perspective view which shows another modification of a drainage cloth. It is an operation | movement principle figure which shows the modification of the drain discharge system which can function a drain discharge system. It is an operation | movement principle figure which shows another modification which can function a drain discharge system. It is explanatory drawing which shows the modification of a backflow prevention means.

Below, the drain discharge system which concerns on embodiment of this invention is demonstrated.
As shown in FIG. 1, the drain discharge system according to the present embodiment is a drain discharge system 23 that discharges drain generated from the latent heat recovery type secondary heat exchangers 10 b and 11 b directly to the drain of the bathroom 4. It is a system equipped with. That is, in this embodiment, the drain discharge system 23 is configured to be provided across the heat source unit 1 and the bathroom 4 including the secondary heat exchangers 10b and 11b.

First, the heat source device 1 will be described. The configuration of the operation principle diagram in FIG. 1 is well-known and will be briefly described.
As shown in FIG. 1, the heat source unit 1 includes a combustion device 7 that burns fuel gas as fuel, a reheating heat exchanger 10 and a hot water supply heat exchanger 11 built in the combustion device 7, and a hot water supply device. A circuit 20 and a reheating circuit 21 are provided.

The combustion device 7 incorporates a plurality of burners 12. And the solenoid valve 14 is provided for every system | strain, and supply of fuel gas can be interrupted for every system | strain. A blower 16 that blows air mainly mixed with fuel gas is attached to the inner lower portion (upstream side in the air flow direction) of the can body 8.
In addition, a gas proportional valve 15 is provided outside the can body 8 and upstream of the electromagnetic valve 14 in the fuel gas flow direction, so that the amount of fuel gas supplied to each burner 12 can be controlled. it can.

  In the hot water supply circuit 20, cold water flowing through the bypass flow path 27 is mixed with high temperature hot water flowing through the high temperature hot water flow path 26 passing through the hot water supply heat exchanger 11, adjusted to hot water having a desired temperature, and hot water supply (not shown). Supply hot water from the stopper. The hot water supply circuit 20 is connected to a reheating circuit 21.

  The reheating circuit 21 forms a circulation circuit 19 including the bathtub 5, a bath return flow path 30 for returning hot water from the bathtub 5 side to the reheating heat exchanger 10 of the heat source unit 1, and reheating A bath-out passage 31 is provided for feeding hot water from the heat exchanger 10 side to the bathtub 5 side. A bath pump 32 is provided in the middle of the bath return channel 30.

  Further, the reheating heat exchanger 10 and the hot water supply heat exchanger 11 are mainly composed of a sensible heat recovery type primary heat exchanger 10a, 11a that recovers sensible heat of combustion gas, and a primary heat exchanger 10a, 11a. It also has a latent heat recovery type secondary heat exchanger 10b, 11b that is located upstream in the flow direction of hot water and mainly recovers the latent heat of the combustion gas. More specifically, the reheating heat exchanger 10 on the left side inside the can body 8 is provided with a primary heat exchanger 10a and a secondary heat exchanger 10b from the upstream side in the flow direction of the combustion gas. 8, a hot water supply heat exchanger 11 on the right side is provided with a primary heat exchanger 11a and a secondary heat exchanger 11b from the upstream side in the flow direction of the combustion gas. The sensible heat recovery type heat exchanger is formed of a finned copper tube, and the latent heat recovery type heat exchanger is formed of a stainless steel bare tube.

  In the secondary heat exchangers 10b and 11b, when the latent heat of the water vapor contained in the combustion gas is recovered, the water vapor is liquefied and becomes drain. Moreover, since this drain exhibits acidity, it needs to be drained after neutralization. Accordingly, in the heat source apparatus 1 employed in the present embodiment, a part of the drain discharge system 23 for draining the drain generated in the secondary heat exchangers 10b and 11b is formed.

  In other words, the drain discharge system 23 in the heat source unit 1 includes a known neutralizer 29 in which a neutralizing agent (calcium carbonate or the like) is filled in the middle of the flow path, and the drain neutralized by the neutralizer 29 is temporarily. A known drain tank 57 stored in the tank, a heat source side drain pipe 17 connected downstream of the drain tank 57, and a drain discharge pump 58 capable of discharging the drain stored in the drain tank 57 to the heat source side drain pipe 17. Is provided.

  That is, the drain generated in the heat source unit 1 is neutralized by the neutralizer 29 and temporarily stored in the drain tank 57. When the water level in the drain tank 57 reaches a certain level or more, the drain discharge pump 58 is activated. The drain in the drain tank 57 is discharged to the drain pipe 17 side.

  By the way, in an environment where the installation of the heat source device 1 is restricted, it may be impossible to secure a drainage portion of the drain. That is, as described above, in a housing complex or the like, for example, since the heat source unit 1 is installed on a pipe shaft or the like, the drain discharged from the heat source side drain pipe 17 cannot be drained to the outside. There is.

Therefore, in the present embodiment, the extended drain pipe 18 is connected to the heat source side drain pipe 17, and the drain generated in the heat source unit 1 is discharged to the bathroom 4 side. Specifically, in the drain discharge system of the present embodiment, the drain discharge system 23 is formed by effectively using the drainage cloth (pipe connection means) 3.
The drainage cloth 3 is the same as that known in the art, and a force is transmitted from the downstream side of the bathtub drainage port 53 to the drainage plug 55 capable of restricting the drainage of the bathtub 5 so that the drainage plug 55 is drained from the bathtub. The opening 53 can be opened and closed.

Below, the drainage cloth 3 employ | adopted in this embodiment is demonstrated. In the following description, unless otherwise specified, the relationship between the top, bottom, left, and right is based on FIG.
As shown in FIG. 2, the drainage cloth 3 employed in the present embodiment is disposed in the lower part of the bathtub 5 and is installed in a substantially sealed space shielded by a bathtub apron (not shown). It is comprised by the introduction side adapter 33 attached so that it may connect with the bathtub drain outlet 53, and the discharge | emission side adapter 34 provided in the bathroom 4 and connected to the bathtub side discharge | emission part 50 connected with the external sewer piping etc. which are not shown in figure. Yes. That is, the drainage cloth 3 is connected to the introduction side adapter 33 and the discharge side adapter 34 by a predetermined connection means 51 so that the connection part is substantially sealed and the hot water flows inside. A channel 40 (FIG. 3) is formed, and is discharged to the bathtub-side discharge unit 50 through the in-cross channel 40 and can be drained to a drainage system (not shown).
The connecting means 51 may be anything as long as the two members can be connected to each other.

As shown in FIGS. 3 and 4, the introduction-side adapter 33 is a joint member in which a part of the in-cross flow path 40 (introduction-side flow path 43) is formed, and hot water discharged from the bathtub 5 is vertically directed. To flow in an “L” shape in the horizontal direction. That is, the introduction-side adapter 33 sends the hot water discharged from the bathtub 5 to the introduction-side adapter main body 33a first and the hot water that has passed through the introduction-side flow path 43 to the discharge-side adapter 34 side. It has a bathtub-side outlet 42 for discharging.
Furthermore, as shown in FIG. 6, the introduction-side adapter 33 in the present embodiment has two connecting portions through which a drain plug moving wire (drain plug moving means) 56 that transmits a force to the drain plug 55 is inserted ( Connection portions 35, 36) are provided. Note that the drain plug moving wire 56 is the same as a known wire and is not directly related to the present invention, and a specific description thereof will be omitted.

The bathtub side introduction port 41 is a circular opening that is arranged on the upper part of the introduction side adapter main body 33 a and is opened upward in the vertical direction, and is also an upstream end portion of the introduction side flow path 43. That is, the hot water introduced from the bathtub side introduction port 41 flows downward along the introduction side flow path 43 in the vertical direction.
The bathtub-side discharge port 42 is a rectangular opening that is disposed on the side portion of the introduction-side adapter main body 33 a and is opened in the horizontal direction, and is different from the downstream-side end portion (the bathtub-side introduction port 41 of the introduction-side channel 43). End). That is, hot water flowing in the horizontal direction along the introduction-side flow path 43 is discharged from the bathtub-side discharge port 42 and introduced to the discharge-side adapter 34 side.

  The connection portions 35 and 36 are tube-like portions arranged on the side portion of the introduction-side adapter body 33a, and have through holes (communication portions) 47 and 48 that communicate with the introduction-side flow path 43 in the horizontal direction. ing. Specifically, the connecting portions 35 and 36 share the same height as the flow path extending in the horizontal direction in the introduction-side flow path 43, but the extending directions of the through holes 47 and 48 are different. More specifically, the extending direction of the through hole 47 in one connecting portion 35 is shifted by 20 to 30 degrees clockwise with respect to the extending direction of the horizontal flow path in the introduction-side flow path 43, and the other The extending direction of the through hole 48 in the connecting portion 36 is shifted 20 to 30 degrees counterclockwise with reference to the extending direction of the horizontal flow path in the introduction-side flow path 43. And the connection parts 35 and 36 are connected in the middle of the flow path extended in the orthogonal | vertical direction in the introduction side flow path 43 in the base end side. That is, in this embodiment, the connection parts 35 and 36 are arrangement | positioning in which the hot water drained from the bathtub 5 does not substantially flow in.

  In addition, as a characteristic configuration of the present embodiment, one of the two connection portions 35 and 36 is used as an opening through which the drain plug movable wire 56 that is the original purpose is inserted, and the other connection is used. The part 36 is used as a drain flow path that forms part of the drain discharge system 23. That is, the extended drain pipe 18 that forms a part of the drain discharge system 23 is connected to the other connection portion 36. Thereby, the drain generated in the secondary heat exchangers 10 b and 11 b passes through the heat source side drain pipe 17 and the extended drain pipe 18 and is introduced into the in-cross flow path 40 through the connection portion 36.

  As shown in FIGS. 3 to 5, the discharge-side adapter 34 is a joint member in which a part of the in-cross flow path 40 (discharge-side flow path 44) is formed, and the hot water discharged from the introduction-side adapter 33 is removed. It flows in an inverted “L” shape from the horizontal direction to the vertical direction. That is, the discharge-side adapter 34 has a discharge-side adapter main body 34a into which the hot water discharged from the introduction-side adapter 33 is first introduced, and the hot-water that has passed through the discharge-side flow path 44 is further downstream. A discharge port 46 for discharging to the side discharge unit 50 is provided.

The discharge side introduction port 45 is a rectangular opening that is disposed on the side portion of the discharge side adapter main body 34 a and is opened in the horizontal direction, and is also an upstream end portion of the discharge side flow path 44. That is, the discharge side introduction port 45 is connected so as to communicate with the introduction side discharge port 42, and is an opening through which hot water discharged from the introduction side discharge port 42 flows, and the hot water introduced from the discharge side introduction port 45 is It flows in the horizontal direction along the discharge side flow path 44. The inner diameter of the discharge side introduction port 45 is designed to be substantially the same as or slightly larger than the outer diameter of the bathtub side discharge port 42. That is, the introduction side adapter 33 and the discharge side adapter 34 are connected in a state where the bathtub side discharge port 42 is fitted into the discharge side introduction port 45.
The discharge-side discharge port 46 is a circular opening that is arranged in the lower part of the discharge-side adapter main body 34a and is opened downward in the vertical direction, and is an end portion of the discharge-side flow path 44 (an end portion different from the discharge-side introduction port 45). It is also. That is, the hot water flowing vertically downward along the discharge side flow path 44 is discharged from the discharge side discharge port 46 and discharged to the bathtub side discharge portion 50.

  Therefore, in this embodiment, since the extended drain pipe 18 is connected to one connection portion 36 to form the drain discharge system 23, the drain that has flowed through the heat source side drain pipe 17 and the extended drain pipe 18 is It is introduced into the drainage cloth 3 from the part 36. Then, the drain introduced into the drainage cloth 3 through the connection part 36 flows into the introduction side flow path 43, passes through the discharge side flow path 44, and is discharged to the bathtub side drainage part 50. That is, according to this embodiment, in addition to the hot water drained from the bathtub 5, even the drain can be directly discharged to the bathtub-side drainage unit 50 by the drainage cloth 3.

  In the present embodiment, a check valve (back flow preventing means) 39 is provided in the middle of the extended drain pipe 18. Therefore, even when “clogging” occurs in the drainage cloth 3 or on the downstream side of the drainage cloth 3, there is no problem that the drained hot water or drain flows back to the extended drain pipe 18 side.

In the said embodiment, although the structure which forms the drain discharge system | strain 23 using the drainage cloth 3 which has the two connection parts 35 and 36 was shown, this invention is not limited to this, For example, one connection part 35 originally. The extension drain pipe 18 may be connected to the drainage cloth 60 that has only it. In this case, as shown in FIG. 7, a through hole (communication portion) 62 communicating with the in-cross flow path 61 is formed at any position of the drainage cloth 60, and drain is introduced into the through hole 62. The extension drain pipe 18 may be connected.
Moreover, it is not the structure which connects the extended drain piping 18 to the drainage cloth 60, for example, as shown in FIG. 8, some piping connection means (for example, the tube-like thing standing upwards) is provided in the bathtub side drainage part 50, for example. The extended drain pipe 18 may be configured to be provided and connected to the pipe connecting means. Thereby, the drain which flowed from the extended drain piping 18 can be drained to the drainage system which is not shown in figure through a piping connection means.

  Moreover, in the said embodiment, although the structure which connected the extended drain piping 18 to the bathtub side drainage part 50 including the bathtub side drainage part 50 from the bathtub drainage port 53 was shown, this invention is not limited to this, Bathroom The extended drain pipe 18 may be connected to a flow path downstream of the washing place side drain port (not shown) provided on the washing place side 4 in the hot water flow direction. In short, it is only necessary to be downstream of the bathtub drain 53 or the washing-room-side drain in the hot water flow direction. However, in consideration of workability such as maintenance, hot water discharged from both the bathtub drain 53 and the washing-room-side drain It is desirable to connect the extended drain pipe 18 until the position where the two are merged.

In the said embodiment, although the structure which connects the extended drain piping 18 directly to the heat source side drain piping 17 and forms the drain discharge system | strain 23 was shown, this invention is not limited to this, The heat source side drain piping 17 and extended drain A configuration in which the pipe 18 is indirectly connected may be used.
For example, by providing a double pipe in a part of the reheating circuit 21 and connecting the heat source side drain pipe 17 and the extended drain pipe 18 to one flow path of the double pipe, the same operation as in the above embodiment is performed. An effect can be obtained. That is, as shown in FIG. 9, a double pipe is provided in a part of the section of the bath flow path 31, and branch joints 65 and 66 are provided at the ends of the flow path in the section. The heat source side drain pipe 17 or the extended drain pipe 18 is connected to the above. More specifically, the heat source side drain pipe 17 is connected to the upstream branch joint 65, and the extended drain pipe 18 is connected to the downstream branch joint 66. And the downstream end part of the extension drain piping 18 is connected to piping connection means, such as a drainage cloth. Thereby, drain can be discharged | emitted downstream from the bathtub drain outlet 53 or the washing-room side drain outlet arranged in the bathroom 4 like the said embodiment. And furthermore, according to this structure, since the labor of piping of the one part area of a drain discharge system is saved, the working efficiency of installation construction can be improved rather than the said embodiment.

  Further, by using the reheating circuit 21 by using the three-way valves 67 and 68 without providing the double pipe, the same effect as the above-described configuration can be obtained. That is, as shown in FIG. 10, one three-way valve 67 is disposed upstream of the bath pump 32 disposed in the bath return flow path 30, and the heat source side drain pipe 17 is connected to the three-way valve 67. The one-way valve 68 is arranged in the bath flow path 31, and the extended drain pipe 18 is connected to the three-way valve 68. Further, according to this configuration, the drain in the heat source side drain pipe 17 can be caused to flow to the reheating circuit 21 side by driving the bath pump 32, so that the drain discharge pump arranged in the heat source side drain pipe 17. 58 can be omitted. And the downstream end part of the extension drain piping 18 is connected to piping connection means, such as a drainage cloth. Thereby, drain can be discharged | emitted downstream from the bathtub drain outlet 53 or the washing-room side drain outlet arranged in the bathroom 4 like the said embodiment.

  Moreover, in the said embodiment, although the structure which provided the check valve 39 in the middle of the extension drain piping 18 was shown, this invention is not limited to this, For example, as shown in FIG. A configuration may be adopted in which a tank 69 having an open top is disposed between the pipe connection means (drainage cloth 3 and the like) and drain is discharged to the pipe connection means via the tank 69. In short, any device may be used as long as hot water or drain does not flow backward to the extended drain pipe 18 side.

3 Drainage cloth (pipe connection means)
4 Bathroom 5 Bath 17 Heat source side drain piping (drain piping)
18 Extended drain piping (drain piping)
39 Check valve (backflow prevention means)
40, 61 Cross passage 47, 48, 62 Through hole (communication hole)
53 Bath drain outlet 55 Drain plug 56 Drain plug movable wire (Drain plug moving means)
69 Tank (Backflow prevention means)

Claims (3)

A drain discharge system that mainly discharges drain generated in a heat exchanger that recovers latent heat of combustion gas to the bathroom,
Drain piping for draining to the bathroom side;
Piping connection means for connecting the drain piping on the bathroom side,
The bathroom has a bathtub capable of storing hot water, and the hot water stored in the bathtub is drained from the bathtub drain through a drainage system,
The drain connection system is characterized in that the pipe connecting means is connected to the drainage system on the downstream side in the hot water flow direction from the bathtub drainage port, and drains the drainage pipe through the drain pipe. The bathtub drainage port is restricted from passing hot water by a drain plug,
The drain plug is capable of opening and closing the bathtub drain by means of a drain plug moving means that transmits power from the downstream side of the hot water flow direction,
The pipe connection means has a flow path that guides hot water that has passed through the bathtub drain to the merging section side, and at least two communication sections that communicate with the flow path, and any one of the communication sections is 2. A function as an opening through which the drain plug moving means is inserted, wherein another one communicating portion can be used as a drain connecting portion to which a drain pipe is connected. The drainage system described in 1. The drain pipe has backflow prevention means,
The backflow prevention means is arranged in the middle of the drain pipe or between the drain pipe and the pipe connection means, and prevents the drain or hot water from flowing from the downstream side in the drain flow direction toward the upstream side. The drain discharge system according to claim 1 or 2, wherein

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