JP5556999B2 - Drain discharge piping member and heat source machine - Google Patents

Description

  The present invention relates to a drain discharge piping member, and more particularly to a piping joint for discharging drain generated in a latent heat recovery type heat exchanger in a heat source machine. Moreover, it is related with the heat-source machine provided with the piping member for the drain discharge.

  Hot water heaters equipped with heat source devices for heating hot water and the like and hot water circulation type heating devices are widely used in general households. In addition, in order to improve the heat exchange efficiency of hot water, etc., the heat source equipment that uses fuel gas mainly contains the latent heat of the combustion gas in addition to the primary heat exchanger that mainly recovers the sensible heat of the combustion gas. The thing of the structure provided with the secondary heat exchanger to collect | recover is known.

That is, the gas as household fuel used in this type of heat source machine is mainly liquefied natural gas or liquefied petroleum gas, and since the main component is methane or propane, there are many hydrogen components. Therefore, water vapor is generated by combustion. The secondary heat exchanger described above recovers the latent heat of the water vapor, but the water vapor contained in the combustion gas liquefies and generates drain when the temperature is lowered by heat exchange.
In addition, combustion reacts with nitrogen in the air and oxygen to produce nitrogen oxides, so that the drain generated on the surface side of the secondary heat exchanger is exposed to the combustion gas, so that the drain is oxidized with nitrogen. The object melts and exhibits acidity (mainly nitric acid).

  Usually, in a water heater provided with this type of heat source device, acidic drain generated in the secondary heat exchanger is discharged to the outside through a drain discharge system. Specifically, the drain generated in the secondary heat exchanger is introduced into a neutralizer filled with a neutralizing agent (such as calcium carbonate) in the middle of the drain discharge system, and neutralized in the neutralizer. And discharged to the outside.

  By the way, in the middle of the drain discharge system, particularly in the downstream side of the neutralizer, there is a possibility that the inside of the piping is clogged or the drain to be discharged due to construction failure or the like is not properly discharged to the outside. Paying particular attention to the case where the inside of the pipe is clogged, in cold regions and in winter, the outside air temperature may drop to about minus 20 degrees Celsius. In this case, the drain remaining on the inner wall of the pipe freezes, It may be blocked by frozen drain. As a result, drain accumulates upstream from the frozen portion in the pipe, and eventually the drain water level in the neutralizer rises excessively (exceeds the specified water level).

  Normally, when drain accumulates in the pipe and overflows in the neutralizer, a control unit such as a water heater stops the operation of the heat source unit for safety. That is, even when the water level in the neutralizer rises due to freezing of the drain, the control unit recognizes that the neutralizer is clogged, so the heat source unit is stopped for safety. In other words, even if the inside of the pipe is temporarily frozen, the control unit misidentifies that the neutralizer is clogged and controls any function (hot water supply operation, etc.) so that it cannot be used. Some people felt inconvenience.

  Therefore, when the inside of the pipe is clogged due to freezing, for example, the freeze prevention heater used for preventing freezing of the water supply pipe described in Patent Document 1 can solve the problem caused by freezing inside the drain discharge system. It is taken into consideration.

JP 2008-157540 A

However, since freezing in the drain discharge system is a temporary action that satisfies a specific condition, if a means for providing a heating means such as a heater is employed, the manufacturing cost increases.
In addition, since whether or not the drain discharge system is frozen varies depending on the construction site where the heat source apparatus is actually installed, the heating means itself may be wasted even if the heating means such as a heater is provided. . That is, there is a concern that it is not possible to confirm whether the cost effectiveness for the increase in manufacturing cost is obtained at all construction sites. However, if measures for freezing in the drain discharge system are not taken, the drain in the neutralizer may exceed the specified water level and cause a problem on the heat source unit side when frozen.

  Therefore, in view of the problems of the prior art, the present invention provides a drain discharge piping member and a heat source device that prevent malfunction of the heat source device due to clogging on the downstream side of the neutralizer without increasing the manufacturing cost. The purpose is to do.

In order to solve the above-mentioned problems, the invention described in claim 1 is provided in a heat source apparatus that heats hot water or a heat medium, and drain generated mainly by a heat exchanger that recovers latent heat of combustion gas is discharged from the heat source apparatus. A drain discharge piping member that forms a part of the drain discharge system, the drain discharge piping member is a cylinder, and includes a side opening that communicates the inside and outside of the cylinder, and the entire side opening is cylindrical. An auxiliary auxiliary wall is provided to cover the inner wall side of the body, and a discharge auxiliary space is formed between the side opening and the inner wall auxiliary wall. The discharge auxiliary space is closed on the upstream side of the cylinder and downstream A drain discharge piping member having a side communicating with a side opening and capable of discharging the drain from the side opening when the drain stays in the vicinity of the inner wall auxiliary wall .
The invention according to claim 2 is provided in a heat source apparatus for heating hot water or a heat medium, and a drain discharge system in which drain generated mainly in a heat exchanger for recovering latent heat of combustion gas is discharged from the heat source apparatus. A drain discharge piping member that forms a part, and the drain discharge piping member is a cylinder, and covers a side opening that communicates the inside and outside of the cylinder and the entire side opening from the inner wall side of the cylinder. A drain discharge piping member having an inner wall auxiliary wall and having a discharge auxiliary space formed between the side opening and the inner wall auxiliary wall. The drain discharge piping member includes two cylindrical members having different dimensions. Is a joint for piping formed by being joined in the axial direction, and the center axis of the inner diameters of the two cylindrical members are arranged so as not to coincide with each other.

The drain discharge piping member of the present invention has a side opening that communicates the inside and outside of the cylinder of the pipe, and an inner wall auxiliary wall that covers the entire side opening from the inner wall side of the cylinder. The end of the inner wall auxiliary wall on the upstream side in the drain flow direction is fixed, and a discharge auxiliary space is formed between the side opening and the inner wall auxiliary wall.
That is, in the present invention, as described above, due to a special environment such as a cold district or winter, clogging due to freezing occurs temporarily downstream of the drain opening direction from the position of the side opening. Even when the exhaust system is not discharged to the outside, the drain can be urgently discharged to the outside through the discharge auxiliary space and the side opening. Thereby, for example, even when clogging occurs on the downstream side of the neutralizer in the drain discharge system, the inside of the neutralizer does not overflow with drain. Therefore, since it is prevented that a controller such as a water heater erroneously detects “clogging of the neutralizer”, inconvenience such as the safety control working and the heat source unit not being operated is not given to the user. Along with this, there is no concern that the drain in the neutralizer exceeds the specified water level and causes problems on the heat source unit side.
In the present invention, since a heating means such as a heater is not used in the drain discharge system, the manufacturing cost does not increase significantly.

According to the first and third aspects of the present invention, the discharge auxiliary space is such that the upstream side of the cylinder is closed and the downstream side communicates with the side opening, and the drain stays in the vicinity of the inner wall auxiliary wall. In addition, the drain can be discharged from the side opening .

  According to such a configuration, the drain auxiliary space can discharge drain from the side opening when the upstream side of the cylinder is closed and the downstream side communicates with the side opening and the drain stays in the vicinity of the inner wall auxiliary wall. That is, in the drain discharge system, when the drain flow is normal, the drain does not leak from the side opening.

According to a fourth aspect of the present invention, the side opening is formed by a surface connecting the inner wall and the outer wall of the cylindrical body, and a surface having at least a side along the axis of the cylindrical body is the outer wall. The drain discharge piping member according to any one of claims 1 to 3, wherein the drain discharge piping member has a shape that expands toward the inner wall.

  According to this configuration, of the surfaces forming the side opening, at least the surfaces having sides parallel to the axis of the cylinder are shaped to be separated from the outer wall of the piping member toward the inner wall. In other words, the surface forming the side opening has a shape in which the thickness between the inner wall and the outer wall becomes thinner toward the opening edge. Thereby, since the space to the side surface opening is expanded, even if the drain stays in the piping member, the drain easily flows into the discharge auxiliary space. That is, according to the present invention, the drain accumulated in the piping member is easily discharged from the side opening.

According to a fifth aspect of the present invention, the drain discharging pipe member is a pipe joint formed by joining two cylindrical members having different dimensions in the axial direction, and the central axis of the inner diameter of the two cylindrical members is The drain discharge piping member according to claim 1 , wherein the drain discharge piping members are arranged so as not to coincide with each other.

  According to such a configuration, the cylindrical members having different dimensions are connected in the axial direction, and the center axes of the respective cylindrical members are arranged so as not to coincide with each other. Therefore, the inner wall auxiliary wall is provided in the cylindrical member, and the inner wall auxiliary is provided. Even if the discharge auxiliary space is formed between the wall and the side opening, the size of the entire piping member does not increase. That is, for example, by shifting the central axes of the two cylindrical members and providing the inner wall auxiliary wall at a position where the inner walls are farthest apart, the cylindrical member provided with the side opening to secure the discharge auxiliary space is provided. There is no need to increase the size.

In the invention according to claim 6 , the upstream cylindrical member has an inner diameter smaller than that of the downstream cylindrical member, and the inner wall auxiliary wall is connected to the inner wall of the cylindrical member at the joint portion of the upstream cylindrical member. the inner surface of the inner wall the auxiliary wall are fixed to have the same surface on the other of the cylindrical member, one of the claims 2 to 5, characterized in that the side opening is provided at a position corresponding to the inner wall auxiliary wall a drain discharge pipe member according to any.

  According to such a configuration, one of the two cylindrical members has a smaller inner diameter than the other, and the inner wall of the cylindrical member and the inner surface of the inner wall auxiliary wall have the same surface at the connection side end of the one cylindrical member. Therefore, if one cylindrical member is arranged upstream of the other cylindrical member in the flow direction of the drain, it is possible to prevent the drain from leaking from the side opening when the drain is flowing normally. .

In the drain discharge piping member of the present invention, the drain discharge system includes a neutralizer that neutralizes acidic drain, and forms a flow path downstream of the neutralizer in the drain flow direction. desirable. (Claim 7 )

The invention according to claim 8 is a heat source apparatus including a secondary heat exchanger that mainly recovers latent heat of combustion gas, and a drain discharge system that discharges the drain generated in the secondary heat exchanger to the outside. The heat source apparatus has a housing and the drain discharge piping member according to any one of claims 1 to 7 , and at least a side opening of the drain discharge piping member is located outside the housing. It is the heat source machine characterized by this.

According to such a configuration, as described above, due to a special environment such as a cold region or winter, clogging due to freezing occurs temporarily on the downstream side of the drain flow direction from the position of the side opening, and the drain is drained. Even when it falls into a situation where it is not discharged to the outside from the discharge system, the drain can be discharged to the outside urgently through the side opening. In addition, since the side opening is located outside the housing of the heat source machine, drain does not accumulate inside the housing.
Therefore, as a result, it is prevented that a controller such as a water heater erroneously detects “clogging of the neutralizer”, so that inconvenience is given to the user such that the safety control is activated and the heat source unit is not operated. There is no.

  In the drain discharge piping member and the heat source apparatus of the present invention, the drain can be discharged to the outside through the side opening even when the piping of the drain discharge system is clogged due to freezing or the like. Further, since the inner wall auxiliary wall is provided inside the side opening, when the drain is flowing normally, the drain is prevented from leaking from the side opening.

It is an operation | movement principle figure of the heat source machine with which the latent heat recovery type secondary heat exchanger was arranged. It is a perspective view which shows the substance of the heat-source apparatus of FIG. 1 provided with the piping member for drain discharge which concerns on embodiment of this invention. It is an enlarged side view which shows the attachment state of the piping member for drain discharge of FIG. It is a perspective view which shows the piping member for drain discharge. It is AA sectional drawing which shows the piping member for drain discharge of FIG. It is an A direction arrow directional view which shows the piping member for drain discharge of FIG. It is a B direction arrow directional view which shows the piping member for drain discharge of FIG. It is BB sectional drawing which shows the piping member for drain discharge of FIG. It is sectional drawing which shows the modification of side opening.

  Below, the piping member 1 for drain discharge which concerns on embodiment of this invention is demonstrated.

First, the heat source device 2 in which the drain discharge piping member 1 of the present embodiment is arranged 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 device 2 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 a hot water supply port 28. Supply hot water with appropriate temperature. The hot water supply circuit 20 is connected to a reheating circuit 21.

  The reheating circuit 21 forms a circulation circuit 18 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 device 2, and reheating A bath-out passage 31 is provided for feeding hot water from the heat exchanger 10 side to the bathtub 5 side.

Further, the reheating heat exchanger 10 and the hot water supply heat exchanger 11 described above include a sensible heat recovery type primary heat exchangers 10a and 11a that mainly recover sensible heat of combustion gas, and a primary hot water supply heat exchanger 11a. Further, it has latent heat recovery type secondary heat exchangers 10b and 11b which are located upstream of the hot water flow direction and mainly recover 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. That is, the latent heat recovery type secondary heat exchangers 10b and 11b are made of a material that is more excellent in corrosion resistance than the sensible heat recovery type primary heat exchangers 10a and 11a.

Further, in the secondary heat exchangers 10b and 11b, the water contained in the combustion gas is condensed and liquefied drain is generated by heat exchange, and therefore, a drain discharge system 24 that guides the drain to the outside is connected.
The drain discharge system 24 is a drain-dedicated flow path, and is provided with a known neutralizer 29 filled with a neutralizing agent (calcium carbonate or the like) in the middle. That is, the drain that has flowed out of the secondary heat exchangers 10b and 11b is introduced into the neutralizer 29 through a pipe connected to the can body 8, and the neutralized drain is further introduced into the outside through another pipe. To be discharged.

Here, as described above, the drain discharge system of the prior art is freed from drainage due to specific conditions such as cold districts and winter, and the drainage is not discharged by the frozen drain. There was a problem that the inside overflowed. As a result, the control unit misidentifies that the neutralizer is clogged, and the operation of the heat source machine is stopped, causing inconvenience to the user.
Therefore, in this embodiment, in order to eliminate this problem, the drain discharge piping member 1 is adopted as a part of the drain discharge system 24.

  As shown in FIG. 2, the drain discharge piping member 1 of the present embodiment is a piping joint (hereinafter also referred to as a drain joint 1) that forms a part of the downstream side of the drain discharge system 24. As shown, it is disposed on the housing 9 so as to straddle the inside and outside of the housing 9 of the combustion device 7 and is mounted using a fixing means such as a screw. Specifically, it is arranged downstream of the neutralizer 29 arranged in the middle of the drain discharge system 24 in the drain flow direction (lower side in FIG. 2), and between the neutralizer 29 and the drain joint 1. It is connected to a rubber tube 19 to be connected. As shown in FIGS. 2 and 3, the connecting portion between the drain joint 1 and the tube 19 is such that the lower end side of the tube 19 is connected to the upper end side of the drain joint 1, and the inner surface of the tube 19 is the drain joint. 1 is connected so as to be in contact with the outer surface of 1.

The drain joint 1 of the present embodiment is made of resin, and as shown in FIGS. 3 and 4, an upper cylindrical member 32 and a lower cylindrical member 33 having two different dimensions are integrally connected. .
The upper cylindrical member 32 is designed to be smaller in inner diameter and outer diameter than the lower cylindrical member 33, and the axial length of the upper cylindrical member 32 is designed to be shorter than the axial length of the lower cylindrical member 33. The tube 19 is connected to the upper cylindrical member 32. That is, the inner diameter of the tube 19 is substantially the same as the outer diameter of the upper cylindrical member 32.

  In addition, on the outside of the upper cylindrical member 32, a ring-shaped large step portion 34 swelled in the outer diameter direction at the base end portion (connection side to the lower cylindrical member 33), and swelled in the outer diameter direction in the axial direction. A small step portion 34 is formed in a ring shape. The large step portion 34 is a portion where the end portion on the connection side of the tube 19 abuts when the tube 19 is connected to the upper cylindrical member 32, and the small step portion 35 presses the inner wall of the tube 19 outward. This is a part that improves the adhesion with the upper cylindrical member 32.

Inside the upper cylindrical member 32, an inner wall auxiliary wall 36 is provided at the end on the base end side. That is, as shown in FIG. 5, the inner wall auxiliary wall 36 is disposed so as to protrude from the end of the upper cylindrical member 32 toward the lower side in the axial direction. As shown in FIG. 6, the inner wall auxiliary wall 36 has substantially the same arc shape as the inner wall of the upper cylindrical member 32, and the inner surface (side closer to the central axis) has the same surface as the inner wall of the upper cylindrical member 32. As shown, the upper (upstream side) end of the inner wall auxiliary wall 36 is integrally fixed to the cylindrical body of the upper cylindrical member 32. That is, as shown in FIG. 7, even if the drain flows from the distal end side (the side opposite to the base end side in the axial direction) of the upper cylindrical member 32, the inner wall auxiliary wall 36 does not become an obstacle to the drain flow.
In the present embodiment, as shown in FIGS. 5 and 6, the size of the inner wall auxiliary wall 36 is designed to be slightly larger than the size of the side opening 37 described later. Specifically, the vertical and horizontal (arc length) length of the inner wall auxiliary wall 35 is approximately 1.2 times longer than the vertical and horizontal (arc length) length of the side opening 37. ing. As shown in FIG. 6, the inner wall auxiliary wall 36 is an arc having a center angle θ of the upper cylindrical member 32 of 45 to 180 degrees, preferably an arc of about 90 degrees.

  The lower cylindrical member 33 is connected to the axial ends without being aligned with the central axis of the upper cylindrical member 32, and as shown in FIG. 6, the inner wall of the upper cylindrical member 32 and the lower cylindrical member 33 An auxiliary wall placement portion 39 is formed in which the inner wall auxiliary wall 36 can be placed with a wider space from the inner wall. Accordingly, the distance between the outer surface of the inner wall auxiliary wall 36 and the inner wall of the lower cylindrical member 33 can be maintained without changing the size of the lower cylindrical member 33.

  Further, as shown in FIG. 5, the lower cylindrical member 33 is formed with a side opening 37 that communicates the inside and outside of the lower cylindrical member 33 on the base end side. The side opening 37 is provided at a position corresponding to the inner wall auxiliary wall 36, and the discharge that communicates the flow path of the drain discharge system 24 and the side opening 37 between the side opening 37 and the inner wall auxiliary wall 36. An auxiliary space 40 is formed. As shown in the enlarged portion of FIG. 4, the discharge assist space 40 is a space in which only the upper part (upstream side) is closed and the left and right sides and the lower part (FIG. 4) are opened. In other words, the discharge assist space 40 is configured such that drain flows from the left and right and the bottom and flows into the side opening 37. Thereby, even if the drain stays in the vicinity of the side opening 37, the staying drain can be discharged to the outside through the discharge auxiliary space 40 and the side opening 37.

The side opening 37 has a substantially rectangular shape when viewed from the side, and has a side (horizontal) length extending in the circumferential direction of the lower cylindrical member 33 rather than a side (vertical) length parallel to the axial direction of the lower cylindrical member 33. Is longer.
In other words, the side opening 37 is an opening penetrating the thickness of the lower cylindrical member 33 and can be said to be formed by a surface connecting the outer wall and the inner wall of the lower cylindrical member 33. That is, in the present embodiment, as shown in FIG. 8, two axial planes (surfaces connecting the outer wall and the inner wall) 38 having sides (vertical) parallel to the axial direction forming the side opening 37 are formed on the outer wall. It is processed into a shape that is separated from each other toward the inner wall. In other words, the side opening 37 is made thinner by the axial surface 38 toward the opening edge. In other words, the inner wall auxiliary wall 36 cannot see the inside of the lower cylindrical member 32 from the side opening 37, but the discharge auxiliary space 40 is enlarged by the axial surface 38 of the side opening 37, and the drain accumulated in the vicinity of the side opening 37. Becomes easy to flow to the discharge auxiliary space 40 side.
A female screw portion 41 is formed on the tip side outside the lower cylindrical member 33, and is connected to a drain pipe (not shown) communicating with the outside by the female screw portion 41.

  In other words, if the drain joint 1 is adopted as a part of the drain discharge system 24, the drain joint 1 can be connected to the outside through the side opening 37 of the drain joint 1, even if it is clogged at any location downstream of the drain joint 1. Can be discharged. Thereby, since the misidentification of clogging of the neutralizer 29 in the control unit (not shown) due to clogging in the drain pipe can be prevented, the heat source unit 3 becomes unusable and does not inconvenience the user.

  In the said embodiment, although the structure of the joint for piping was shown as the piping member 1 for drain discharge, this invention is not limited to this, A mere tubular piping member may be sufficient. Even in this case, in order to arrange the inner wall auxiliary wall 36 on the flow path side, it is desirable to change the inner diameter as in the relationship between the upper cylindrical member 32 and the lower cylindrical member 33.

  In the above embodiment, the surface having sides parallel to the axial direction among the surfaces forming the side opening 37 is shaped to reduce the thickness from the inner wall toward the outer wall, but the present invention is not limited to this, For example, instead of or in addition to the shape of the above-described embodiment, the lower side surface having a side perpendicular to the axial direction may have a shape in which the thickness decreases from the inner wall toward the outer wall.

1 Drain joint (Drain discharge piping member)
2 Heat source machine 9 Housing 10b Secondary heat exchanger 11b Secondary heat exchanger 24 Drain discharge system 29 Neutralizer 32 Upper cylindrical member 33 Lower cylindrical member 36 Inner wall auxiliary wall 37 Side opening 39 Auxiliary wall arrangement part 40 Discharge auxiliary space

Claims (8)

A drain discharge piping member that is provided in a heat source device that heats hot water or a heat medium and that forms part of a drain discharge system in which drain generated mainly in a heat exchanger that recovers the latent heat of combustion gas is discharged from the heat source device Because
The drain discharge piping member is a cylinder, and has a side opening that communicates the inside and outside of the cylinder, and an inner wall auxiliary wall that covers the entire side opening from the inner wall side of the cylinder,
A discharge auxiliary space is formed between the side opening and the inner wall auxiliary wall ,
The discharge auxiliary space is one in which the upstream side of the cylinder is closed and the downstream side communicates with the side opening,
A drain discharge piping member characterized in that, when drain stays in the vicinity of an inner wall auxiliary wall, the drain can be discharged from a side opening . A drain discharge piping member that is provided in a heat source device that heats hot water or a heat medium and that forms part of a drain discharge system in which drain generated mainly in a heat exchanger that recovers the latent heat of combustion gas is discharged from the heat source device Because
The drain discharge piping member is a cylinder, and has a side opening that communicates the inside and outside of the cylinder, and an inner wall auxiliary wall that covers the entire side opening from the inner wall side of the cylinder,
Between the side opening and the inner wall auxiliary wall is a drain discharge piping member in which a discharge auxiliary space is formed,
The drain discharge piping member is a joint for piping formed by joining two cylindrical members having different dimensions in the axial direction, and the central axes of the inner diameters of the two cylindrical members are arranged so as not to coincide with each other. Drain discharge piping member. The discharge auxiliary space is one in which the upstream side of the cylinder is closed and the downstream side communicates with the side opening,
The drain discharge piping member according to claim 2 , wherein when the drain stays in the vicinity of the inner wall auxiliary wall, the drain can be discharged from the side opening. The side opening is formed by a surface connecting the inner wall and the outer wall of the cylindrical body, and at least a surface having a side along the axis of the cylindrical body expands from the outer wall toward the inner wall. The drain discharging piping member according to claim 1 , wherein the drain discharging piping member is provided. The drain discharge piping member is a joint for piping formed by joining two cylindrical members having different dimensions in the axial direction,
The drain discharge piping member according to claim 1 , wherein the central axes of the inner diameters of the two cylindrical members are not aligned. The upstream cylindrical member has a smaller inner diameter than the downstream cylindrical member,
At the joint in the upstream cylindrical member, the inner wall auxiliary wall is fixed so that the inner wall of the cylindrical member and the inner side surface of the inner wall auxiliary wall have the same surface,
6. The drain discharge piping member according to claim 2, wherein the other cylindrical member is provided with a side opening at a position corresponding to the inner wall auxiliary wall. The drain discharge system is equipped with a neutralizer that neutralizes acidic drain,
The drain discharge piping member according to any one of claims 1 to 6 , wherein a flow path downstream of the neutralizer in the flow direction of the drain is formed. A heat source machine including a secondary heat exchanger that mainly recovers latent heat of combustion gas, and a drain discharge system that discharges drain generated in the secondary heat exchanger to the outside,
A heat source machine has a casing and a drain discharge piping member according to any one of claims 1 to 7 ,
At least the side opening of the drainage piping member is located outside the housing.

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