JP2021025704A - Water heater - Google Patents

Abstract

To prevent dripping of hot water of a discharge pipe into a housing, while preventing lowering of workability related to putting in/taking out of a neutralizer, even when the hot water discharged from an edge-cutting valve can be discharged with drain.SOLUTION: In a bath water heater, at a drain outlet 83 provided at a bottom surface of a neutralizer 55, an upper end of a drain discharge pipe 58 is connected in a detachable manner. A lower end of the drain discharge pipe 58 is connected to an overflow port 103 provided at a bottom plate 101. Between the upper end and the lower end of the drain discharge pipe 58, a branch pipe 61 is formed, and at the branch pipe 61, a discharge pipe 50 is connected in which hot water is discharged from an edge-cutting valve.SELECTED DRAWING: Figure 6

Description

The present invention relates to a latent heat recovery type water heater in which a circulation heating circuit such as a bath circuit is arranged side by side in the hot water supply circuit and a neutralizer is provided.

The latent heat recovery type water heater is provided with a neutralizer for neutralizing and discharging the drain generated when the latent heat is recovered. In this neutralizer, for example, as disclosed in Patent Document 1, the inside of a container filled with a neutralizing agent is divided into a plurality of regions by a plurality of partition walls, and openings are alternately formed at the upper end or the lower end of the partition walls. Each area is formed and communicated in order to the most downstream drainage chamber. As a result, the drain introduced from the introduction port flows down each region in order through the upper and lower openings, and is neutralized by the neutralizing agent filled in the container, and the drain discharge pipe is discharged from the drain port of the drain port chamber. It is designed to be discharged to the outside via.
On the other hand, for example, in a water heater in which a bath circuit is installed side by side in a hot water supply circuit, a cutting valve is provided in the piping between the hot water supply circuit and the bath circuit in order to prevent hot water from the bath circuit from flowing into the hot water supply circuit. (See Patent Document 2). This edge-cutting valve opens when the internal pressure from the bath circuit becomes equal to or higher than the back pressure from the hot water supply circuit, and discharges hot water from the bath circuit to the outside through a drain pipe.

JP-A-2018-31494 Japanese Unexamined Patent Publication No. 2005-61639

Regarding the treatment of hot water discharged from the edge cutting valve, it is rational to connect the drain pipe to the neutralizer and discharge it from the drain discharge pipe together with the neutralized drain.
However, since the neutralizer may be removed from the housing of the water heater, such as by replenishing the neutralizing agent, in this case, it is necessary to temporarily remove the drain pipe of the edge cut valve from the neutralizer. Therefore, it takes extra time to attach and detach the drain pipe, and there is a possibility that the hot water remaining in the removed drain pipe may flow down into the housing and be applied to other electrical parts and the like.

Therefore, according to the present invention, even if the hot water discharged from the edge cutting valve can be discharged together with the drain, the workability of taking in and out the neutralizer can be prevented from being lowered, and the hot water in the drain pipe can be prevented from flowing down into the housing. The purpose is to provide a water heater that can be used.

In order to achieve the above object, in the invention according to claim 1, a hot water supply circuit and a circulation heating circuit are arranged side by side in a housing, and a circulation heating circuit is used in a pipe connecting the two circuits. A water heater provided with a marginal valve for discharging backflowing hot water and a neutralizer for draining drainage on the bottom plate of the housing.
The upper end of the drain discharge pipe is detachably connected to the drain outlet provided on the bottom surface of the neutralizer, and the lower end of the drain discharge pipe is connected to the overflow port provided on the bottom plate.
A branch portion is formed between the upper end and the lower end of the drain discharge pipe, and the drain pipe from which hot water is discharged from the edge cutting valve is connected to the branch portion.
In the invention according to claim 2, in the configuration of claim 1, a shallow bottom portion is partially formed on the bottom surface of the neutralizer so as to be separated upward from the bottom plate when installed on the bottom plate, and the drain outlet is a shallow bottom portion. It is characterized in that a drain discharge pipe is arranged below the shallow bottom portion.

According to the invention of claim 1, the upper end of the drain discharge pipe is detachably connected to the drain outlet provided on the bottom surface of the neutralizer, and the lower end of the drain discharge pipe is provided on the bottom plate of the housing. By connecting to the overflow port and connecting the drain pipe that discharges hot water from the edge cutting valve to the branch part formed between the upper end and the lower end of the drain discharge pipe, it is possible to replenish the neutralizing agent, etc. When removing the neutralizer from the housing, the neutralizer can be taken out as it is by removing the drain outlet from the drain discharge pipe, and when the neutralizer is taken in and out, the drain pipe is attached to and detached from the drain discharge pipe. It becomes unnecessary. Therefore, even if the hot water discharged from the edge cutting valve can be discharged together with the drain, it is necessary to prevent the workability of the neutralizer from being lowered and the hot water remaining in the drain pipe from flowing into the housing. Can be done.
According to the invention of claim 2, in addition to the above effect, a shallow bottom portion is partially formed on the bottom surface of the neutralizer so as to be separated upward from the bottom plate in the state of being installed on the bottom plate, and the drain outlet is shallow. Since it is formed on the bottom and the drain discharge pipe is arranged below the shallow bottom, the drain discharge pipe can be installed and connected to the drain pipe smoothly in the housing, and the neutralizer can be placed on the bottom plate in a space-saving manner. It can be installed.

It is a schematic circuit diagram of a bath water heater. It is a perspective view of a neutralizer. FIG. 2 is a cross-sectional perspective view taken along the line AA of FIG. It is a perspective view from the upper side of the case body. (A) is an exploded perspective view of the neutralizer and the bottom plate from below, and (B) is a perspective view from below with the neutralizer attached to the bottom plate. (A) is a front view of the connection portion between the neutralizer and the drain discharge pipe, and (B) is an explanatory view of a state in which the neutralizer is removed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Outline configuration of bath water heater)
FIG. 1 is a schematic circuit diagram of a bath water heater 1 which is an example of a water heater.
In this bath water heater 1, a hot water supply combustion chamber 4 and a bath combustion chamber 5 are partitioned by a partition member 3 in an inner body 2 housed in a housing (not shown), and below each of the combustion chambers 4 and 5. It is equipped with hot water supply burners 6, 6 ... and a bath burner 7 consisting of a plurality of burners. Further, spark plugs 8 and frame rods 9 are provided in the combustion chambers 4 and 5, respectively. A combustion fan 10 for supplying combustion air to the burners 6 and 7 is provided in the lower portion of the inner body 2.
A hot water supply primary heat exchanger 11 and a hot water supply secondary heat exchanger 12 through which the combustion exhaust of the hot water supply burner 6 passes are provided in the upper part of the hot water supply combustion chamber 4, and a bath burner 7 is provided in the upper part of the bath combustion chamber 5. A bath primary heat exchanger 13 and a bath secondary heat exchanger 14 through which the combustion exhaust of the above passes are provided. The secondary heat exchangers 12 and 14 are housed in an exhaust hood 15 provided on the upper portion of the inner body 2. The exhaust hood 15 is formed with an exhaust port 16 for discharging combustion exhaust gas that has passed through the secondary heat exchangers 12 and 14, respectively.

A gas pipe 17 to which a gas pipe from the outside is connected is connected to a gas inlet provided on the bottom surface of the housing. Gas branch pipes 18, 18 ... Branching from the gas pipe 17 are connected to the hot water supply burner 6 and the bath burner 7, respectively, and a gas solenoid valve for opening and closing the gas flow path is connected to each gas branch pipe 18. 19 are provided respectively. Further, the gas pipe 17 before branching is provided with a source gas solenoid valve 20 and a gas proportional valve 21 from the upstream side, respectively.

A water supply pipe 22 connected to the water inlet on the bottom surface of the housing is connected to the inlet of the heat absorption pipe of the hot water supply secondary heat exchanger 12. From the upstream side, the water supply pipe 22 includes a strainer 23 provided with a drain plug, a hot water supply water amount sensor 24 for detecting the amount of water flowing through the water supply pipe 22, a hot water supply water supply thermistor 25 for detecting the water inlet temperature, and a water amount control motor 26. And are provided. The outlet of the heat absorption tube is connected to the inlet of the heat transfer tube of the hot water supply primary heat exchanger 11, and the hot water outlet tube 27 connected to the hot water outlet on the bottom surface of the housing is connected to the outlet of the heat transfer tube. The hot water supply pipe 27 is provided with a hot water supply heat exchanger thermistor 28 for detecting the outlet temperature from the hot water supply primary heat exchanger 11, and a hot water supply hot water outlet thermistor 29 for detecting the hot water discharge temperature from the appliance on the downstream side thereof. A bypass pipe 30 that bypasses the primary and secondary heat exchangers 11 and 12 of the hot water supply is connected between the upstream side of the hot water supply thermista 29 in the hot water supply pipe 27 and the downstream side of the water amount control motor 26 in the water supply pipe 22. The bypass pipe 30 is provided with a water distribution valve 31 that controls the bypass flow rate.
In this way, the water from the water supply pipe 22 passes through the hot water supply secondary heat exchanger 12 and the hot water supply primary heat exchanger 11 in this order, exchanges heat with the combustion exhaust of the hot water supply burner 6, and is heated, and then the hot water outlet pipe. A hot water supply circuit A for hot water to be discharged from 27 is formed.

On the other hand, a return tube 35 connected to the bath return port on the bottom surface of the housing is connected to the inlet of the heat absorption tube of the secondary bath heat exchanger 14. The bath return port is connected to the bathtub 37 via an external return pipe 36. Further, a pump 38 is provided on the downstream side of the return pipe 35, a bath return thermistor 39 for detecting the bath return temperature is provided on the upstream side of the pump 38, and a bath water flow switch is provided on the downstream side of the pump 38. 40 and a water level sensor 41 are provided.
The outlet of the heat absorbing tube of the bath secondary heat exchanger 14 is connected to the inlet of the heat transfer tube of the bath primary heat exchanger 13, and the outlet of the heat transfer tube is the outgoing tube 42 connected to the bath outlet on the bottom of the housing. Be connected. The bath return port is connected to the bathtub 37 via an external outbound pipe 43. The going pipe 42 is provided with a bath going thermistor 44 that detects the bath going temperature.
In this way, the hot water of the bathtub 37 passes through the return pipe 35 in this order from the bath secondary heat exchanger 14 and the bath primary heat exchanger 13 to exchange heat with the combustion exhaust of the bath burner 7 by operating the pump 38. After being heated, a bath circuit B (circulation circuit) is formed which returns from the going pipe 42 to the bathtub 37.

Further, a drop pipe 45 is connected between the downstream side of the hot water discharge pipe 27 from the bypass pipe 30 and the upstream side of the return pipe 35 from the pump 38. The drop pipe 45 is provided with a drop water solenoid valve 46 that opens and closes the drop pipe 45 from the upstream side (hot water discharge pipe 27 side), and a bath water amount sensor 47 that detects the amount of water flowing through the drop pipe 45. .. Further, two check valves 48 and 48 are provided on the upstream side and the downstream side of the bath water amount sensor 47, respectively, and the edge is cut between the check valve 48 on the upstream side and the bath water amount sensor 47. The valve 49 is connected. The edge cut valve 49 is connected from the return pipe 35 by connecting the drain pipe 50 connected to the overflow port provided on the bottom surface of the housing and the introduction pipe 51 connected to the downstream side of the strainer 23 in the water supply pipe 22. When the internal pressure of the hot water in the drop pipe 45 increased by the backflow becomes higher than the back pressure applied from the introduction pipe 51, the hot water flowing back from the drop pipe 45 is discharged to the overflow port via the drain pipe 50.

A neutralizer 55 for neutralizing the drain generated in the hot water supply secondary heat exchanger 12 and the bath secondary heat exchanger 14 is provided in the housing. The neutralizer 55 is connected to the drain receiver 56 provided on the bottom surface of the exhaust hood 15 via the drain introduction pipe 57, and is also connected to the drain pipe 50 of the edge cutting valve 49 and the drain discharge pipe 58. There is. Further, the neutralizer 55 is provided with a water level electrode 59 for detecting the water level, and is provided with a drain outlet 60 for discharging drain from the bottom surface of the housing. Details of the neutralizer 55 will be described later.
Reference numeral 65 denotes a controller that receives a detection signal from each thermistor or a sensor and operates each valve or the like to control the temperature of hot water to be discharged, control the filling of hot water in the bathtub 37, or the like, 66 is a hot water supply remote controller, and 67 is a bath remote controller.

(Normal operation of bath water heater)
In this bath water heater 1, normal hot water supply and hot water filling are performed as follows.
First, in the hot water supply circuit A, the hot water tap of the external pipe connected to the hot water outlet is opened, water is passed through the appliance from the water supply pipe 22, and when the water flow is detected by the hot water supply water amount sensor 24, the controller 65 determines. The combustion fan 10 is rotated for a predetermined time to discharge the combustion exhaust stored in the hot water supply combustion chamber 4 (prepurge). After that, the main gas solenoid valve 20 of the gas pipe 17 and each gas solenoid valve 19 are opened, the gas proportional valve 21 is opened at a predetermined opening degree, gas is supplied to the hot water supply burner 6, and the igniter is operated. The ignition plug 8 ignites the hot water supply burner 6.
As a result, in the hot water supply secondary heat exchanger 12, the water flowing from the water supply pipe 22 to the heat absorption pipe comes into contact with the combustion exhaust of the hot water supply burner 6 to recover latent heat, and in the hot water supply primary heat exchanger 11, the heat transfer pipe is connected to the heat absorption pipe. The hot water flowing into the hot water supply burner 6 comes into contact with the combustion exhaust of the hot water supply burner 6 to recover the apparent heat, and the hot water heated with high thermal efficiency is discharged from the hot water supply tap through the hot water outlet pipe 27 and the external pipe.

The controller 65 monitors the outlet temperature by the hot water supply heat exchanger 28 of the hot water supply pipe 27 and drives the water distribution valve 31, so that the outlet temperature can prevent the generation of drainage and overheating in the hot water supply primary heat exchanger 11. The flow rate (bypass rate) to the bypass pipe 30 is controlled so as to be maintained within the temperature range.
Further, the hot water supply and discharge thermistor 29 monitors the hot water discharge temperature, and the opening and closing control of each gas electromagnetic valve 19 and the opening of the gas proportional valve 21 are performed so that the hot water discharge temperature becomes the set temperature specified by the hot water supply remote controller 66 or the bath remote controller 67. The temperature is adjusted and the amount of air is continuously changed by controlling the rotation speed of the combustion fan 10.
When the hot water supply plug is closed, the controller 65 confirms that the signal from the hot water supply water amount sensor 24 has stopped, closes the original gas solenoid valve 20 and the gas solenoid valve 19, extinguishes the hot water supply burner 6, and rotates the combustion fan 10 for a predetermined time ( Post purge).

On the other hand, when the automatic switch of the hot water supply remote controller 66 or the bath remote controller 67 is pressed, the controller 65 opens the drop water electromagnetic valve 46 of the drop pipe 45 to allow water to pass through the hot water supply primary and secondary heat exchangers 11 and 12. The hot water supply burner 6 is burned. The hot water from the hot water outlet pipe 27 is supplied to the bathtub 37 from the external return pipe 36 through the drop pipe 45 and the return pipe 35. When the amount of water detected by the bath water amount sensor 47 provided in the drop pipe 45 reaches the set amount of water, the drop water solenoid valve 46 is closed to stop the water flow and extinguish the hot water supply burner 6.
Next, in the bath circuit B, the pump 38 is operated to circulate hot water between the bath primary and secondary heat exchangers 13 and 14 and the bathtub 37. At this time, when the temperature of the hot water circulated by the bath return thermistor 39 and the bath going thermistor 44 is monitored and a decrease from the set temperature is confirmed, the controller 65 ignites the bath burner 7 and the combustion fan 10 releases the combustion air. Supply. Therefore, the bath circulating water circulating between the bath primary and secondary heat exchangers 13 and 14 and the bath 37 comes into contact with the combustion exhaust of the bath burner 7 when flowing through the heat absorption tube of the bath secondary heat exchanger 14. The latent heat is recovered, and when it flows through the heat transfer tube of the primary bath heat exchanger 13, it comes into contact with the combustion exhaust and the sensible heat is recovered and heated to a set temperature. When the set temperature is reached, the controller 65 stops the combustion of the bath burner 7 and the operation of the pump 38.

(Explanation of neutralizer)
FIG. 2 is a perspective view of the neutralizer 55, and FIG. 3 is a cross-sectional perspective view taken along the line AA. The neutralizer 55 includes a vertically long case main body 70 having an open upper surface and a lid plate 71 that closes the upper surface of the case main body 70. The case body 70 has a rectangular shape in a plan view in which the front and rear are long, and a shallow-bottomed overhanging portion 72 protruding rearward is formed at a position on the right side of the rear surface. The bottom surface of the overhanging portion 72 is an inclined surface that inclines downward as it goes forward.
The lid plate 71 also has the same plan view shape as the case body 70 including the overhanging portion 72, and a drain inlet 73 to which the drain introduction pipe 57 is connected is provided above the overhanging portion 72. In front of the drain inlet 73, outlets 74 and 74 for the water level electrode 59 are provided.

Further, as shown in FIG. 4, the inside of the case main body 70 includes a first partition wall 75 having an L-shaped plan view and a second partition wall 76 formed in the left-right direction in front of the first partition wall 75. , A third partition wall 77 having an L-shape in a plan view connected to the front surface of the second partition wall 76 and the inner surface on the left side of the case body 70 is erected in the vertical direction. Due to the first to third partition walls 75 to 77, the inside of the case main body 70 includes a first region 78 that communicates with the inside of the overhanging portion 72 behind the first partition wall 75, and the first partition wall 75 in front of the first region 78. Surrounded by a second region 79 formed between the second partition wall 76, the front and right surfaces of the second partition wall 76 and the third partition wall 77, and the inner surface of the case body 70 in front of the second region 79. The third area 80 on the right side and the fourth area 81 on the left side surrounded by the rear surface and the left side surface of the second partition wall 76 and the third partition wall 77 and the inner surface of the case body 70 in front of the second area 79. It is partitioned. The drain outlet 60 is provided on the bottom surface of the second region 79. The portion of the case body 70 including the left side of the third region 80 and the fourth region 81 is a shallow bottom portion 82 whose bottom surface is located on the upper side, and a drain discharge pipe 58 is connected to the bottom surface of the fourth region 81. A drain outlet 83 is provided.

Further, a first lower communication port 84 is formed at the lower end of the front and rear portions of the first partition wall 75, and a second lower communication port 85 is formed at the lower end of the right side portion of the second partition wall 76. .. Therefore, the first region 78 and the second region 79 communicate with each other at the lower ends via the first lower communication port 84, and the second region 79 and the third region 80 communicate with each other via the second lower communication port 85. The lower ends will communicate with each other.
Further, each of the partition walls 75 to 77 is erected over the entire vertical length in the case main body 70, and the upper end is brought into close contact with the lower surface of the lid plate 71, so that each region 78 to the upper part in the neutralizer 55 80 is blocked. However, a plurality of upper communication ports 86, 86 ... Are formed at the upper ends on the left and right portions on the front side of the third partition wall 77, and the third area 80 and the fourth area 81 are formed through the upper communication ports 86. It is an overflow wall 77A that communicates with.

On the other hand, as shown in FIG. 5A, the drain outlet 60 protrudes downward from the bottom surface of the case body 70 and is closed by inserting the drain plug 90 from below. At the base of the drain outlet 60, a ring-shaped one end 91a of a strip-shaped connecting band 91 made of resin is rotatably exteriorized, and the ring-shaped other end 91b of the connecting band 91 is a drain plug 90. It is exteriorized in the middle part of. Therefore, the drain plug 90 is suspended and supported from the drain port 60 by the connecting band 91 without falling when it is pulled out from the drain port 60.
Further, on the bottom surface of the case body 70 behind the drain opening 60, the intermediate portion 91c of the connecting band 91 that is folded in half with the drain plug 90 inserted into the drain opening 60 is fitted to the left and right. A U-shaped positioning portion 92 viewed from the bottom is projected from the drain outlet 60 in a forward-facing posture with both ends facing the drain opening 60.

Then, in the bottom plate 101 of the housing 100 shown in FIG. 5, the case body 70 of the neutralizer 55 is installed on the bottom plate 101, and the drain outlet 60 and the positioning portion 92 are passed through the bottom plate 101 downward from the bottom plate 101. An opening 102 to be exposed is formed.
Further, as shown in FIG. 6A, the drain discharge pipe 58 connected to the drain outlet 83 is arranged in the vertical direction below the shallow bottom portion 82 of the case body 70, and the lower end is provided on the lower surface of the bottom plate 101. It is connected to the overflow port 103. A branch pipe 61 projecting to the left is formed in the middle portion of the drain discharge pipe 58, and a drain pipe 50 connected to the edge cutting valve 49 is connected to the branch pipe 61. ..

In the bath water heater 1 configured as described above, the case body 70 of the neutralizer 55 is filled with a predetermined amount of the neutralizing agent in the overhanging portion 72 and the first to third regions 78 to 80. The upper opening is closed by the lid plate 71. Then, the drain drain plug 90 is inserted into the drain outlet 60 to close the plug, and the drain outlet pipe 58 is connected to the drain outlet 83 and placed on the bottom plate 101 of the housing 100. At this time, if the intermediate portion 91c is held by the positioning portion 92 as shown in FIG. 5A, the connecting band 91 is restricted from rotating and does not protrude from the positioning portion 92, so that the case body 70 There is no risk of the connecting band 91 being sandwiched between the case body 70 and the bottom plate 101 when the connecting band 91 is placed on the bottom plate 101, and as shown in FIG. 5 (B), the drain outlet 60 and the positioning portion 92 are opened at the opening 102. Can be penetrated smoothly.
Next, if the drain introduction pipe 57 is connected to the drain inlet 73 of the lid plate 71, the drain discharge pipe 58 is connected to the overflow port 103, and the drain pipe 50 is connected to the branch pipe 61 of the drain discharge pipe 58, neutralization is achieved. Installation of the vessel 55 is completed.

(Explanation of drain neutralization and discharge action by neutralizer)
The drain generated in the exhaust hood 15 by using the hot water supply circuit A or the bath circuit B passes through the drain introduction pipe 57 from the drain receiver 56 and falls into the case body 70 from the drain inlet 73. A filter plate 93 (FIG. 3) having a plurality of slits is provided between the case body 70 and the lid plate 71 at the positions of the overhanging portion 72 and the first region 78.
Therefore, the drain that has fallen into the case body 70 through the filter plate 93 flows into the first region 78 through the bottom surface of the overhanging portion 72 as shown by the dotted line arrow in FIG. 4, and flows into the first region 78, and the first lower communication port 84. It flows to the second region 79 via. Further, it flows from the second region 79 to the third region 80 via the second lower communication port 85. Therefore, the drain in the case body 70 is stored in the first to third regions 78 to 80 to have substantially the same water level, and is neutralized by the neutralizing agent in each region 78 to 80. In particular, since the bottom surface of the overhanging portion 72 also serves as a drainage outflow route, a neutralizing effect can be obtained by the neutralizing agent filled in the overhanging portion 72.
Since the upper portions of the regions 78 to 80 are separated by the partition walls 75 to 77 and do not communicate with each other, even if acid gas enters the case body 70 together with the drain, the first lower communication port 84 at the lower end It is not possible to pass through each area 78 to 80 without passing through the second lower communication port 85. Therefore, the acid gas is surely in contact with the neutralizing agent and neutralized.

Then, as shown by the solid arrow, when the water level of the drain in the case body 70 rises and reaches the upper communication port 86 of the overflow wall 77A of the third partition wall 77 beyond the shallow bottom portion 82, the neutralized drain is released. , Overcoming the overflow wall 77A from the upper communication port 86 and falling into the fourth region 81. Therefore, it reaches the overflow port 103 from the drain outlet 83 at the bottom of the fourth region 81 via the drain discharge pipe 58, and is discharged to the outside of the appliance.
On the other hand, when draining to prevent freezing, if the drain plug 90 is pulled out from the drain opening 60, the drain accumulated in the case body 70 can be discharged from the drain opening 60. At this time, since the areas 78 to 80 are connected to each other by the first and second lower communication ports 84 and 85 as described above, the drains of all the areas 78 to 80 should be discharged from one drain port 60. And no drain remains.

When the neutralizer 55 is removed from the housing 100 to replenish the neutralizing agent, the connection between the drain outlet 83 and the drain discharge pipe 58 is disconnected, and the drain is discharged as shown in FIG. 6 (B). If the neutralizer 55 is lifted upward with the tube 58 connected to the bottom plate 101, the neutralizer 55 can be taken out from the housing 100. Therefore, it is not necessary to disconnect the drain discharge pipe 58 and the drain pipe 50 of the edge cutting valve 49.

(Effect of the invention relating to the partition wall of the neutralizer)
As described above, in the neutralizer 55 and the bath water heater 1 of the above-described embodiment, the first and second partition walls 75 and 76 are adjacent to each other in the case body 70 except for the fourth region 81 including the drain outlet 83. The third partition wall 77, which has first and second lower communication ports 84 and 85 for communicating with each other in the first to third regions 78 to 80 at the lower end and forms the fourth area 81, has an upper communication port for overflow at the upper end. The overflow wall 77A in which the 86 is formed is included, and the drain introduced into the case body 70 from the drain inlet 73 is passed through the first and second lower communication ports 84 and 85, except for the fourth region 81. While the stored drain can be stored in the first to third regions 78 to 80, the stored drain can be discharged from the drain outlet 83 by overcoming the overflow wall 77A through the upper communication port 86.
As a result, the drain stored in all of the first to third regions 78 to 80 can be discharged from the drain outlet 60 provided at one location, and freezing can be reliably prevented by draining.

In particular, here, since the upper ends of the partition walls 75 to 77 are in close contact with the lower surface of the lid plate 71, the acid gas that has entered from the drain inlet 73 does not directly flow to the fourth region 81, and is similar to the drain. It is neutralized by passing through each region 78 to 80 through the first lower communication port 84 and the second lower communication port 85 at the lower end. Therefore, the airtightness of each region 78 to 80 can be ensured and the discharge of acid gas can be effectively prevented.
Further, the case body 70 has a shallow-bottomed overhanging portion 72 that projects outward, and the lid plate 71 has a shape that closes the upper part of the overhanging portion 72 so that the drain inlet 73 is overhanging the overhanging portion 72. Since it is arranged above, a long path from the drain inlet 73 to the drain outlet 83 can be formed to ensure neutralization with a neutralizing agent.

In the invention relating to the partition wall, the number and shape of the partition wall and the partition structure of the region are not limited to the above-mentioned form, and can be changed as appropriate. The shape of the lower communication port may be changed to a semicircular shape or the like, or may be formed into a plurality of notches like the upper communication port. The number and shape of the upper communication port may be changed.
Further, the position of the drain outlet is not limited to the above-mentioned form, and may be in another region. The overhang may also be provided or omitted at another position.
Further, in the water heater, the bath circuit may not have a secondary bath heat exchanger, or may have no bath circuit and only a hot water supply circuit.

(Effect of the invention relating to the positioning portion of the connecting band)
In the bath water heater 1 of the above-described embodiment, a drain outlet 60 to which a drain outlet 90 is detachably attached is provided on the bottom surface of the neutralizer 55, and the drain outlet 90 and the drain outlet 60 are The intermediate portion 91c is connected by a flexible connecting band 91 that folds in half when the drain plug 90 is attached, and is connected to the bottom surface of the neutralizer 55 in the middle of the connecting band 91 when the drain plug 90 is attached. While the positioning portion 92 for holding the portion 91c is provided, the bottom plate 101 has an opening 102 that penetrates the drain outlet 60 and the positioning portion 92 and is exposed to the lower side of the bottom plate 101 in the installed state of the neutralizer 55. Is formed.
As a result, when the neutralizer 55 is installed, if the connecting band 91 is held by the positioning portion 92 with the drain plug 90 attached, the connecting band 91 is sandwiched between the neutralizer 55 and the bottom plate 101. There will be no such thing. Therefore, drainage can be reliably performed.

In particular, here, since the positioning portion 92 has a U-shaped bottom view with both ends facing the drain outlet 60 side, the rotation of the connecting band 91 can be reliably regulated and the direction away from the drain outlet 60 (here). Then, the protrusion of the intermediate portion 91c to the rear side) can be effectively prevented.

In the invention relating to the positioning portion, the shape of the positioning portion can be changed as appropriate without being limited to the above-mentioned form, and rotation regulation is possible not only in the U-shape in the bottom view but also in the pair of left and right wall portions.
The connecting band may also be C-shaped instead of ring-shaped at both ends, or may be wound in a belt shape. The shape is not limited to a strip shape, and may be a rod shape as long as it is flexible.
The internal structure of the neutralizer is not limited to the above-mentioned form, and there may be no partition wall.
Further, the water heater may not have a secondary bath heat exchanger in the bath circuit, or may not have the bath circuit itself.

(Effect of the invention relating to the drain discharge pipe)
In the bath water heater 1 of the above embodiment, the upper end of the drain discharge pipe 58 is detachably connected to the drain outlet 83 provided on the bottom surface of the neutralizer 55, and the lower end of the drain discharge pipe 58 is provided on the bottom plate 101. A branch pipe 61 (branch portion) is formed between the upper end and the lower end of the drain discharge pipe 58, which is connected to the overflow port 103, and the branch pipe 61 is drained from the edge cutting valve 49. The pipe 50 is connected.
As a result, when the neutralizer 55 is taken out from the housing 100 for replenishment of the neutralizing agent or the like, the neutralizer 55 can be taken out as it is by removing the drain outlet 83 from the drain discharge pipe 58. It is not necessary to attach / detach the drain pipe 50 to / from the drain discharge pipe 58 each time the drain pipe 50 is taken in and out. Therefore, even if the hot water discharged from the edge cutting valve 49 can be discharged together with the drain, the hot water remaining in the drain pipe 50 flows down into the housing 100 while preventing a decrease in workability related to the loading and unloading of the neutralizer 55. It can also be prevented.

In particular, here, a shallow bottom portion 82 is partially formed on the bottom surface of the neutralizer 55 so as to be separated upward from the bottom plate 101 when installed on the bottom plate 101, and the drain outlet 83 is formed on the shallow bottom portion 82 to be shallow. Since the drain discharge pipe 58 is arranged below the bottom portion 82, the drain discharge pipe 58 can be installed and connected to the drain pipe 50 smoothly in the housing 100, and the neutralizer 55 saves space on the bottom plate 101. It can be installed at.

In the invention relating to the drain discharge pipe, the shape and position of the drain discharge pipe are not limited to the above-mentioned form, and the drain discharge pipe may be arranged in an inclined shape instead of in the vertical direction, or on the rear side or the lateral side of the neutralizer. It can be changed as appropriate, such as by arranging it in. As for the connection form of the branch pipe and the drain pipe, the branch pipe may be provided on the front side depending on the position of the drain discharge pipe.
Further, the branch portion is not limited to the branch pipe, and the drain discharge pipe may be provided with an outlet serving as a branch portion, and the drain pipe may be inserted and connected to the outlet.
Further, the shallow bottom portion may be provided on the front side right portion instead of the front side left portion of the above-described form, or on the rear side or the side surface side. It is also possible to omit the shallow bottom portion and connect the drain discharge pipe and the drain pipe below the bottom plate. The internal structure is not limited to the above form, and there may be no partition wall.
The water heater may not have a secondary bath heat exchanger in the bath circuit, or may be a circulation heating circuit (heating circuit or the like) other than the bath circuit.

In addition, in common with each invention, the position of the neutralizer is not limited to the right side in the housing, but may be the left side or the center, and the size and shape of the neutralizer itself are not limited to the above-mentioned form, and are left and right. It may have a long rectangular shape in a plan view, a square shape in a plan view, a circular shape in a plan view, or the like. Further, the structure is not limited to the two parts of the lid plate and the case body, and the lid plate is integrated with the case body and a plurality of parts divided at other positions are combined to form a neutralizer. You can also.

1 ・ ・ Bath water heater, 2 ・ ・ Inner body, 4 ・ ・ Hot water combustion chamber, 5 ・ ・ Bath combustion room, 6 ・ ・ Hot water burner, 7 ・ ・ Bath burner, 11 ・ ・ Hot water primary heat exchanger, 12 ・・ Hot water supply secondary heat exchanger, 13 ・ ・ Bath primary heat exchanger, 14 ・ ・ Bath secondary heat exchanger, 15 ・ ・ Exhaust hood, 17 ・ ・ Gas pipe, 22 ・ ・ Water supply pipe, 27 ・ ・ Hot water pipe , 30 ... bypass pipe, 35 ... return pipe, 37 ... bathtub, 42 ... outbound pipe, 45 ... drop pipe, 49 ... edge cut valve, 50 ... drain pipe, 55 ... neutralizer, 57 ... Drain introduction pipe, 58 ... Drain discharge pipe, 60 ... Drain outlet, 61 ... Branch pipe, 65 ... Controller, 70 ... Case body, 71 ... Lid plate, 72 ... Overhang , 73 ... Drain entrance, 75 ... 1st partition wall, 76 ... 2nd partition wall, 77 ... 3rd partition wall, 77A ... Overflow wall, 78 ... 1st area, 79 ... 2nd area , 80 ... 3rd area, 81 ... 4th area, 82 ... shallow bottom, 83 ... drain outlet, 84 ... 1st lower communication port, 85 ... 2nd lower communication port, 86 ... upper communication Mouth, 90 ... drain plug, 91 ... connecting band, 92 ... positioning part, 100 ... housing, 101 ... bottom plate, 102 ... opening.

Claims (2)

A hot water supply circuit and a circulation heating circuit are arranged side by side in the housing, and a rim cutting valve for discharging hot water flowing back from the circulation heating circuit is provided in a pipe connecting the two circuits. A water heater provided with a neutralizer for draining drainage on the bottom plate of the housing.
The upper end of the drain discharge pipe is detachably connected to the drain outlet provided on the bottom surface of the neutralizer, and the lower end of the drain discharge pipe is connected to the overflow port provided on the bottom plate.
A water heater characterized in that a branch portion is formed between the upper end and the lower end of the drain discharge pipe, and a drain pipe from which hot water is discharged from the edge cutting valve is connected to the branch portion. .. A shallow bottom portion is partially formed on the bottom surface of the neutralizer so as to be separated upward from the bottom plate when installed on the bottom plate, and the drain outlet is formed on the shallow bottom portion and below the shallow bottom portion. The water heater according to claim 1, wherein the drain discharge pipe is arranged.

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