JP5681074B2 - Latent heat recovery type water heater - Google Patents

Description

  The present invention relates to a latent heat recovery type water heater provided with a secondary heat exchanger for recovering latent heat.

Conventionally, there has been such a latent heat recovery type hot water heater as shown in FIG.
101 is an apparatus main body provided with a combustion section 102 that burns fuel, 103 is a primary heat exchanger that heats hot water in the piping by sensible heat of combustion gas generated in the combustion section 102, and 104 passes through the primary heat exchanger 103. Secondary heat exchanger that heats the hot water in the pipe with the latent heat of the combustion gas generated, 105 is a neutralizer in which a neutralizing agent 106 is sealed, 107 is a water supply pipe through which city water flows, and 108 is each heat exchanger. A hot water supply pipe in which hot water heated by the fluid flows, 109 is a hot water supply circuit in which the water supply pipe 107, the secondary heat exchanger 104, the primary heat exchanger 103, and the hot water supply pipe 108 are sequentially connected by piping, and 110 is a secondary heat exchanger. A drain pipe for flowing the drain water generated at 104 into the neutralizer 105, 111 is an overpressure relief valve that is installed in the middle of the hot water supply circuit 109, opens the valve when the pressure in the pipe rises, and drains, 112 is an overpressure relief valve Drain connected to 111 A hot water supply drainage pipe flowing into the neutralizer 105.

  By connecting the drain pipe 110 and the hot water drain pipe 112 to the upper part of the neutralizer 105, the strongly acidic drain water flowing from the drain pipe 110 is diluted with the hot water flowing from the hot water drain pipe 112, and the pH After the concentration was stabilized, the water could be drained out of the apparatus main body 101, and the construction was simplified by combining the drainage paths into one. (For example, Patent Document 1)

JP 2004-61051 A

  However, in this prior art, the amount of drain water flowing into the neutralizer 105 from the drain pipe 110 is not equal to the amount of warm water flowing into the neutralizer 105 from the hot water drain pipe 112. The amount to be diluted is limited, and further, there is a problem that the neutralizing action of drain water is weakened because the neutralizing agent 106 is scraped and the volume is reduced by flowing warm water into the neutralizer 105. .

  In addition, if the water supply pipe 107 side of the hot water supply circuit 109 becomes negative pressure due to water breakage or the like, drainage flowing through the hot water supply drain pipe 112 flows backward, so that drain water that is not sufficiently neutralized in the neutralizer 105 is supplied with hot water. There was a risk of flowing into the hot water supply circuit 109 from the drain pipe 112.

In order to solve the above-mentioned problems, in claim 1 of the present invention, the apparatus main body, the combustion part in the apparatus main body for burning the fuel, and the sensible heat is recovered from the combustion gas generated in the combustion part. A primary heat exchanger that heats water, a secondary heat exchanger that recovers latent heat from the combustion gas that has passed through the primary heat exchanger and heats hot water, and drain water generated by the secondary heat exchanger flows in. A neutralizer, a neutralization portion formed in the neutralizer and filled with a neutralizing agent, a drainage portion for draining drain water neutralized in the neutralization portion to the outside of the apparatus body, and A hot water supply circuit in which hot water heated by the primary heat exchanger and the secondary heat exchanger flows, and a valve connected to the hot water supply circuit to open the valve when the hot water supply circuit is at a high pressure to drain out of the apparatus main body. to the hot water drain pipe overpressure relief valve is installed, the water filling circuit for water to the bathtub is connected to the hot water supply circuit, wherein A latent heat recovery type water heater comprising a bath drain pipe connected to a tension circuit to open a valve and draining hot water in the tension circuit to the outside of the apparatus main body. The bath drain pipe is connected to the drain section of the neutralizer.

  According to a second aspect of the present invention, an opening is formed at a predetermined position of the neutralizer.

  According to claim 1 of the present invention, the hot water drainage pipe and the bath drainage pipe are connected to the drainage part, so that the wastewater flowing through the hot water supply drainage pipe and the bath drainage pipe is enclosed in the neutralization part of the neutralizer. Since the water is drained outside the apparatus main body without contacting the neutralizing agent, it is possible to prevent the neutralizing agent from being consumed early.

  According to the second aspect of the present invention, since the opening that opens to the atmosphere is formed in the neutralizer, the neutralizer is maintained at atmospheric pressure even when the hot water supply circuit becomes negative due to water interruption or the like. It is possible to reliably prevent drain water in the neutralizer and drainage in the drainage from flowing back into the hot water supply circuit or hot water filling circuit to the drain pipe or bath drain pipe.

Schematic configuration diagram of a latent heat recovery type water heater showing an embodiment of the present invention The figure which shows the structure of the neutralizer of the same invention The figure explaining the conventional latent heat recovery type water heater

Next, an embodiment of the present invention will be described with reference to the drawings.
1 is an apparatus main body provided with a combustion section 2 that burns fuel such as kerosene to generate combustion gas, 3 is a primary heat exchanger that heats hot water in the piping by sensible heat of the combustion gas generated in the combustion section 2, Reference numeral 4 denotes a secondary heat exchanger that heats hot and cold water in the pipe with the latent heat of the combustion gas that has passed through the primary heat exchanger 3.

  5 is a water supply pipe in which one end is connected to the secondary heat exchanger 4 and the city water flows, and 6 is a hot water supply pipe in which the primary heat exchange 3 and one end is connected and heated hot water flows. A hot water supply circuit 7 is formed by sequentially connecting the heat exchanger 4, the primary heat exchanger 3, and the hot water supply pipe 6 with pipes.

  8 is a water supply bypass pipe branched from the water supply pipe 6, and 9 is a mixing valve installed in the middle of the hot water supply pipe 7 and connected at one end to the water supply bypass pipe 8. Hot water is mixed by adjusting the opening of the valve 9, and the water is sent to the downstream side of the hot water supply pipe 7.

  10 is a bath provided in the bathroom, 11 is a bath heat exchanger for heating the bath water with the combustion gas generated in the combustion section 2, and 12 is a bath for allowing the bath water stored in the bathtub 10 to flow into the bath heat exchanger 11. A forward pipe 13 is a bath return pipe for allowing the bath water heated by the bath heat exchanger 11 to flow into the bathtub 10, and the bath circulation pipe 14 includes the bath forward pipe 12, the bath heat exchanger 11 and the bath return pipe 13. It is formed.

  Reference numeral 15 denotes a circulation pump installed in the middle of the bath return pipe 13, which circulates the bath water in the bathtub 10 by being driven, and heats the bath water at the set temperature set by the user by heating with the bath heat exchanger 11. To do.

  A hot water filling circuit 16 is connected to the hot water supply pipe 6 and the bath outlet pipe 12 and supplies hot water adjusted by the mixing valve 9 to the bathtub 10, and includes a hot water solenoid valve 17, a hot water flow sensor 18, a drain valve 19, A hopper 21 incorporating two check valves 20 is installed in the middle of the piping.

  22 is a drain collecting plate for collecting drain water generated in the secondary heat exchanger 4, and 23 is a drain pipe connected to the drain collecting plate 22 through which the collected drain water flows.

  A hot water supply drain 24 is connected to the hot water supply circuit 7 and opens and drains by opening an overpressure relief valve 25 when the pressure in the pipe rises due to the heated and expanded hot water heated by the primary heat exchanger 3 and the secondary heat exchanger 4. It is a pipe and drains by appropriately opening an overpressure relief valve 25 according to the pressure in the pipe to prevent damage to the pipe.

  A bath drain pipe 26 is connected to the drain valve 19 and drains the bathtub water that opens the drain valve 19 and flows back through the hot water filling circuit 16 when the hot water supply circuit 7 becomes negative pressure due to water breakage or the like.

  27 is a water tap installed in the water supply pipe 5, and 28 is a water tap installed in the hot water pipe 6 from which hot water of a set temperature flows out when the user operates the plug.

  A neutralizer 29 includes a water sealing part 31 into which drain water flowing in the drain pipe 23 flows, a neutralizing part 32 in which a neutralizing agent 30 such as calcium carbonate is enclosed, and the neutralizing part 32. A drainage part 34 is formed with a drainage channel 33 for draining the neutralized drain water from the neutralizer 29 to the outside of the apparatus main body 1.

  Drain water neutralized by the neutralization unit 32 by connecting the hot water drainage pipe 24 and the end of the bath drainage pipe 26 so that the drainage flowing through the pipe directly flows into the drainage flow path 33 into the drainage part 34. At the same time, the water is drained from the drainage path 33 to the outside of the apparatus main body 1.

  35 is a water seal detection electrode that is installed in the water seal 31 and detects whether water is present in the container. 36 is water that is drained from the water seal 31 by removing the cap during maintenance or replacement of the neutralizer 29 It is a stopper.

  Reference numeral 37 denotes an opening formed on the upper surface of the neutralizing section 32, and the inside of the neutralizer 29 is made equal to the atmospheric pressure by opening it to the atmosphere with a predetermined size.

  38 is an electric heater installed in the lower part of the neutralizer 29. The electric heater 38 is energized when the outside air temperature is low to prevent the drain water in the neutralizer 29 from freezing.

  As described above, since the hot water drainage pipe 24 and the bath drainage pipe 26 are connected to the drainage part 34 of the neutralizer 29, the flow path for draining outside the apparatus main body 1 is integrated into one pipe. Since the drainage flowing through the hot water supply drainage pipe 24 and the bath drainage pipe 26 directly flows into the drainage flow path 33, the construction does not come into contact with the neutralizing agent 30 enclosed in the neutralization section 32, and the inside It is possible to prevent the neutralizing ability from deteriorating due to the summing agent 30 being consumed.

  Further, even if water breakage or the like occurs and the water supply pipe 5 side constituting the hot water supply circuit 7 becomes negative pressure, even if the drainage in the hot water supply drain pipe 24 and the bath drain pipe 26 flows in the reverse direction, the neutralizer 29 Since the inside of the neutralizer 29 is maintained at atmospheric pressure by the formed opening 37, the wastewater in the drainage flow path 33 does not flow backward in the direction of the neutralizer 29, and the mixed wastewater is supplied to the hot water supply circuit 7 or the hot water filling circuit. The cross connection flowing into 16 can be reliably prevented.

  Further, since the electric heater 38 can be installed only in the drainage flow path 33 to prevent the drainage from freezing when the outside air temperature is low, it is not necessary to take the antifreezing countermeasure for each drain pipe, thereby reducing the installation cost. Can be reduced.

  In addition, this invention is not limited to the said Example, For example, it is the structure which connects the hot water supply drainage pipe 24 and the bath drainage pipe 26 in the middle of the drainage flow path 33 installed in the apparatus main body 1. It is also possible to simplify the construction by consolidating the drainage path, reduce the number of installed electric heaters 38 for preventing freezing, and drain the drainage channel 33 from the apparatus body 1 together with drain water from the middle. It is possible.

DESCRIPTION OF SYMBOLS 1 Apparatus main body 2 Combustion part 3 Primary heat exchanger 4 Secondary heat exchanger 7 Hot water supply circuit 10 Bathtub 16 Hot water filling circuit 19 Drain valve 23 Drain pipe 24 Hot water drain pipe 25 Overpressure relief valve 26 Bath drain pipe 29 Neutralizer 30 Neutralizing agent 32 Neutralizing part 33 Drainage channel 34 Drainage part 37 Opening

Claims (2)

An apparatus main body, a combustion section in the apparatus main body for burning fuel, a primary heat exchanger for recovering sensible heat from the combustion gas generated in the combustion section and heating hot water, and passing through the primary heat exchanger A secondary heat exchanger that recovers latent heat from the generated combustion gas and heats the hot water, a neutralizer into which drain water generated in the secondary heat exchanger flows, and a neutralizer formed in the neutralizer Was heated by the neutralization part in which the water was sealed, the drainage part for draining the drain water neutralized in the neutralization part to the outside of the apparatus main body, the primary heat exchanger and the secondary heat exchanger. a hot water supply circuit for hot water to flow, the hot water drain pipe overpressure relief valve in the hot water supply circuit is connected to the fed-water circuit is drained to the outside of the apparatus body to open the valve during a high pressure is established, the hot water supply A hot water filling circuit connected to the circuit and supplying water to the bathtub, and a hot water in the hot water filling circuit connected to the hot water filling circuit and opening a valve. In a latent heat recovery type hot water heater provided with a drainage pipe provided with a drain valve for draining the outside of the apparatus main body, the hot water drainage pipe and the bath drainage pipe are connected to the drainage part of the neutralizer A latent heat recovery type water heater characterized by that.   The latent heat recovery type hot water heater according to claim 1, wherein an opening is formed at a predetermined position of the neutralizer.

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