JP3916438B2 - Latent heat recovery type water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a latent heat recovery type water heater that recovers latent heat energy of combustion exhaust gas and heats water. In particular, the present invention relates to a latent heat recovery type hot water heater in which a drain discharge system generated by condensing water vapor is improved so that piping work is not required.
[0002]
[Prior art]
In recent years, a latent heat recovery type water heater has been developed with a thermal efficiency of 90% or more, and is attracting attention as an energy-saving device.
FIG. 3 is a diagram schematically showing a configuration of a main body of a typical typical latent heat recovery type water heater and a main piping system.
The water heater main body 50 includes a main hot water supply system 51 that supplies hot water to a kitchen and a washroom, a heating system 53 that supplies hot water to a heating device 103 such as a bathroom heater / dryer and an indoor radiator, and a retreat of the bath 137. And a bath chasing system 55 for performing
[0003]
In the combustion chamber 57 of the main hot water supply system 51, a primary heat exchanger 59, a secondary (latent heat recovery) heat exchanger 61, a burner 63, a combustion fan (not shown), and the like are provided. Also in the combustion chamber 65 of the heating system 53, a primary heat exchanger 67, a secondary (latent heat recovery) heat exchanger 69, a burner 71, and the like are provided. The reheating system 55 has a water-water heat exchanger 73 that receives heat from the heating system 53.
[0004]
Each burner 63, 71 is supplied with combustion gas from a gas supply source through a gas supply pipe (not shown). A branch portion from the gas supply pipe to each burner is provided with an original gas solenoid valve (not shown). The gas supply pipe branched to each burner is provided with a gas proportional valve and a gas solenoid valve (both not shown). The amount of gas supplied to the burner of each hot water supply system is controlled by a gas proportional valve, and on / off of supply to each burner is operated by a gas solenoid valve.
Each burner is provided with a spark plug and a frame rod (both not shown). Each spark plug is ignited by an igniter (not shown) to burn the combustion gas supplied to each burner. The flame rod detects the presence of a flame and prevents incomplete combustion.
[0005]
The main hot water supply system 51 includes a water supply pipe 75 to which water is supplied from a water source and a hot water supply pipe 77 to supply hot water to a kitchen or a washroom. The water supply pipe 75 passes through the secondary heat exchanger 61 in the combustion chamber 57, exits the combustion chamber 57, passes through the primary heat exchanger 59 again in the combustion chamber, and is connected to the hot water supply pipe 77. In the combustion chamber 55, the burner 63, the primary heat exchanger 59, and the secondary heat exchanger 61 are arrange | positioned in order along the flow direction of combustion gas.
[0006]
A saucer 79 is attached below the secondary heat exchanger 61 in the combustion chamber 55. The tray 79 communicates with the drain receiver 83 via the drain pipe 81. A drain plug 85 is provided on the bottom surface of the drain receiver 83, and a drain pipe 87 is provided on the top.
[0007]
Next, the latent heat recovery action by the primary heat exchanger 59 and the secondary heat exchanger 61 will be described.
The water supplied from the water supply pipe 75 first passes through the secondary heat exchanger 61. Then, it passes through the primary heat exchanger 59. Here, combustion gas is supplied to the burner 63 below the primary heat exchanger 59 and ignited by a spark plug. Then, combustion air is sent from the combustion fan and burns, generating flames and combustion gases. The primary heat exchanger 59 is heated by the radiant heat generated by the flame and the combustion gas, and the water flowing in the pipe is heated. Then, the combustion gas is sent upward by the fan, that is, toward the secondary heat exchanger 61. The water vapor contained in the combustion gas contacts the secondary heat exchanger 61, and the water flowing through the piping of the secondary heat exchanger 61 absorbs the latent heat of the water vapor. Thereby, water vapor | steam condenses and changes to water.
[0008]
The water changed from the water vapor is dropped on the tray 79 and accumulates in the drain receiver 83 through the drain pipe 81. When the drain receiver 83 reaches a predetermined water level, the water is drained from the drain pipe 87. The combustion gas is exhausted from an exhaust port 89 provided on the side of the secondary heat exchanger 61.
[0009]
On the other hand, the water passing through the secondary heat exchanger 61 absorbs the heat of condensation of the combustion gas and rises in temperature. And since the water whose temperature rose is sent to the primary heat exchanger 59, the hot water finally supplied is heated efficiently.
[0010]
The water supply pipe 75 and the hot water supply pipe 77 are connected by a bypass pipe 93 provided with a bypass electromagnetic valve 91. A thermistor 95 is provided in each of the water supply pipe 75, the hot water supply pipe 77a on the outlet side of the secondary heat exchanger, and the hot water supply pipe 77b downstream of the bypass pipe. These thermistors 95 detect the temperature of water in each pipe. By adjusting the bypass solenoid valve 91 of the bypass pipe 93 so that the temperature of the hot water supplied from the hot water supply pipe 77 becomes an appropriate temperature from these temperatures, the mixing amount of the hot water and water is changed.
[0011]
In addition, the water supply pipe 75 on the outlet side of the secondary heat exchanger 61 is provided with a water amount sensor 97 to adjust the amount of water in the pipe. Further, the hot water supply pipe 77 a is provided with a hot water supply high limit switch 99. The high limit switch 99 is activated when the temperature of the combustion chamber 57 becomes abnormally high, and interrupts the electric circuit of the water heater 50. The hot water supply pipe 77 b is also provided with a water control valve 101, which controls the pressure of hot water supplied from the hot water supply pipe 77.
[0012]
Next, the heating system 53 will be described.
In the combustion chamber 65 of the heating system 53, a primary heat exchanger 67, a secondary heat exchanger 69, a burner 71, and the like are provided. The heating system 53 includes an outgoing pipe 105 that goes from the combustion chamber 65 to the heating apparatus 103, and a return pipe 107 that returns from the heating apparatus 103 to the combustion chamber 65. Outward piping 105 and return piping 107 to each heating device 103 are branched from header 109. The forward piping 105 and the return piping 107 constitute a circulation pipeline between the heating device 103 and the combustion chamber 65, and water in the pipeline is circulated by a pump 111 provided in the circulation pipeline.
[0013]
The return pipe 107 passes through the secondary heat exchanger 69 in the combustion chamber 65, exits the combustion chamber 65, and is stored in the primary systern 113. Then, it exits from the cistern 113 and branches downstream of the pump 111 into a high temperature forward pipe 105H and a low temperature forward pipe 105L. The high temperature forward pipe 105H then passes again through the primary heat exchanger 67 in the combustion chamber 65 and is connected to the heating device, and the low temperature forward pipe 105L is connected to the heating device as it is.
[0014]
In this example, the cistern 113 is provided with a water level sensor 115 composed of three electrodes. Further, a water supply water pipe 117 branched from the water supply pipe 75 of the main hot water supply system 51 and a drain pipe 119 whose ends are open to the outside are connected to the systern 113. The water supply water pipe 117 is provided with a water supply electromagnetic valve 118. When the water level of the cistern 113 detected by the water level sensor 115 reaches a high water level, the water is drained from the drain pipe 119. When the water level drops to a low water level, the make-up water solenoid valve 118 is opened and water is supplied from the water supply pipe 75 through the water supply water pipe 117. Thus, the water level in the cistern 113 is maintained within a predetermined range.
[0015]
In the combustion chamber 65, the burner 71, the primary heat exchanger 67, and the secondary heat exchanger 69 are arranged in order in the combustion gas flow direction. A tray 121 is attached below the secondary heat exchanger 69 in the combustion chamber 65. The tray 121 communicates with the drain receiver 83 via the drain pipe 123.
[0016]
The latent heat recovery action by the primary heat exchanger 57 and the secondary heat exchanger 59 is the same as the latent heat recovery action of the hot water supply system.
[0017]
The high temperature forward pipe 105H and the low temperature forward pipe 105L are connected by a bypass pipe 127 provided with a low temperature check valve 125. The thermistor 129 is provided in the piping 107a on the outlet side of the secondary heat exchanger, the high temperature outgoing pipe 105H on the outlet side of the primary heat exchanger, and the low temperature outgoing pipe 105L downstream of the bypass pipe. These thermistors 129 detect the temperature of water in each pipe. From these temperatures, the degree of combustion of the burner 71 is controlled so that the temperature of the hot water supplied from the outgoing pipe 105 becomes an appropriate temperature.
[0018]
Furthermore, a hot water supply high limit switch 131 is provided in the high-temperature forward piping 105H on the outlet side of the primary heat exchanger. The high limit switch 131 is activated when the temperature in the combustion chamber 65 becomes higher than the above, and shuts off the electric circuit of the water heater 50.
[0019]
Further, a bypass pipe 135 having a thermal valve 133 is connected between the return pipe 107 and the high temperature outgoing pipe 105H. The bypass pipe 135 is for circulating water without operating the combustion section during the freeze prevention operation. The bypass pipe 135 forms a bath reheating system 55 and a water-water heat exchanger 73.
[0020]
Next, the bath chase system 55 will be described.
The bath chase system 55 includes an outgoing pipe 139 from the water heater 50 to the bath 137 and a return pipe 141 from the bath 137. The forward piping 139 and the return piping 141 constitute a circulation pipeline between the bath 137 and the water heater 50, and water is circulated by a pump 143 provided in the circulation pipeline.
[0021]
A hot-water supply pipe 151 branched from a hot-water supply pipe 77 of the main hot-water supply system 51 and a hot-water supply pipe 151 joined by a water injection pipe 147 branched from the water supply pipe 75 are connected to the circulation pipe via a back-and-forth switching valve 153. Yes. The pouring pipe 145 is provided with a check valve 155 and a pouring electromagnetic valve 157. The water injection pipe 147 is provided with a vacuum breaker 156 and a water injection electromagnetic valve 161. The vacuum breaker 156 and the check valve 155 operate when the water supply pressure becomes negative due to water cut or the like, and prevents the water in the circulation line from flowing backward. The water injection solenoid valve 161 and the water injection electromagnetic valve 157 turn on or off the supply of water or hot water to the bath hot water supply system 55.
[0022]
The hot water supply pipe 151 is provided with a pouring amount sensor 163 and a check valve 165. The pouring amount sensor 163 detects the amount of hot water supplied from the hot water supply pipe 151 to the bath 137. The check valve 155 prevents the backflow of water in the circulation line.
[0023]
A water level sensor 167 and a pump 143 provided with a water flow switch 169 are provided upstream of the junction of the hot water supply pipe 151 and the circulation pipe. The water level sensor 167 detects the amount of hot water supplied from the bath return pipe 141 to the circulation pipe. The pump 143 is provided with an overpressure prevention safety device 171 and controls the water pressure in the circulation pipe along with the temperature change of the circulating water. The water flow switch 169 detects the flow direction of the circulating water in the circulation pipe to prevent the backflow of the circulating water.
The return pipe 141 is provided with a thermistor 173.
[0024]
Part of the forward piping 139 forms the heating system 53 and the water-water heat exchanger 73 as described above. In this water-water heat exchanger 73, the water in the circulation line exchanges heat with the hot water of the heating system.
[0025]
A plurality of temperature fuses 177 are provided in the main body of the water heater 50, and are activated when the temperature inside the device becomes higher than that, thereby shutting off the electric circuit of the water heater 50. Further, the temperature signal detected by the thermistor described above is input to the electrical board 179 provided in the main body, and the valves, fans, and the like are controlled. The electrical board 179 is connected to a bathroom remote controller or a kitchen remote controller, and operations of each unit and temperature setting can be performed by remote control operation.
[0026]
[Problems to be solved by the invention]
As described above, the conventional latent heat recovery type water heater is provided with drain pipes 87 and 119 for draining the condensed water (drain) generated by the condensation of water vapor. These drains need to be pulled to the drainage site. However, when a water heater is installed in a pipe shaft with one side facing the corridor, for example, in a recent apartment house, there is no drainage facility in the vicinity of the water heater. It takes a lot of work to do.
[0027]
This invention is made | formed in view of said problem, Comprising: It aims at providing the latent-heat-recovery type hot water heater which does not need piping construction of drain drainage.
[0028]
[Means for Solving the Problems]
The latent heat recovery type water heater of the present invention includes a water heater body and a heating system having a circulation line for supplying hot water from the body to the heating device, the water heater body includes a gas burner, and combustion of the burner A latent heat recovery heat exchanger that heats water by the latent heat of water vapor in the exhaust gas, a drain receiver that receives a drain containing condensed water generated in the heat exchanger, and a drain that accumulates in the drain receiver is connected to a circulation line of the heating system the drain and delivery lines, Bei give a send, the drain receiving is a cistern of the heating system, the heating system, and terminal provided with an opening and closing mechanism is provided, the water level sensor is attached to the cistern, When the water level detected by the water level sensor reaches a predetermined water level, the opening / closing mechanism is opened to drain the heating system from the terminal .
Since the drain is sent to the circulation line of the heating system , a drainage facility for sending the drain from the water heater body to the drainage place becomes unnecessary.
[0029]
In the present invention, if the drain receiver is also used as a cistern of the heating system, it is not necessary to newly provide a drain receiver.
[0030]
In the present invention, it is preferable that a neutralizing agent is enclosed in the cistern, or a neutralizing agent injecting unit is attached, or a tap water injecting unit is attached to the cistern.
The drainage can be neutralized to reduce PH. Alternatively, if a tap water supply means is attached to the drain receptacle, the drain can be neutralized with tap water. Here, the tap water injection means can also be used as a water supply means for cistern.
[0031]
In the present invention, the heating system is provided with a terminal having an opening / closing mechanism, a water level sensor is attached to the systern, and the opening / closing mechanism is opened when a water level detected by the water level sensor reaches a predetermined water level. it is preferred to carry out the drainage of the heating system water from the previous SL end end open.
When the water level of the cistern rises due to the drain injection, the water level of the cistern can be kept constant by purging the heating system from the terminal in the heating system. If the terminal is already equipped with a drainage facility such as a kitchen sink or a waterproof pan for a washing machine, a new facility for drainage drainage is unnecessary.
[0032]
In the present invention, if a water-water heat exchanger of the heating system and bath circulating water is further provided, the bath can be reheated.
[0033]
Hereinafter, it demonstrates, referring drawings.
FIG. 1 is a diagram schematically illustrating the configuration of the main body of the latent heat recovery type hot water heater and the main piping system according to the first embodiment of the present invention.
The water heater 10, piping near receiving structure and the drain of the drain receiving and cistern vicinity of the pipe and the heating device forward pipe, only differs from the water heater of Figure 3, the other parts are the same as water heater of Figure 3 Structure and action. Therefore, the following description will focus on the different parts.
[0034]
In the water heater 10, the drain receiver 83 and the cistern 113 are not provided with a conventional drain pipe. And the drain pipe 11 extended from the drain receptacle 83 is connected to the return pipe line 107b of the exit side of the cistern 113 of a heating system. The drain pipe 11 is provided with a drain electromagnetic valve 13.
[0035]
In the heating system 53, the terminal drain pipe 15 is branched upstream of the header 109 of the return pipe 107. The terminal drain pipe 15 is provided with an electromagnetic valve 17 and the terminal is open. Here, the end is connected to a kitchen sink that easily drains, a waterproof pan of a washing machine, and the like. In such a place, a drain pipe can be easily drawn from a nearby heating system.
[0036]
The drain receiver 83 is provided with a water level sensor (not shown) and detects the water level of the drain water in the drain receiver 83. The drain receptacle 83 may contain calcium carbonate (solid) as a neutralizing agent.
[0037]
When the drain water level in the drain receptacle 83 reaches a predetermined water level, the drain electromagnetic valve 13 of the drain pipe 11 is opened, and the drain is drained to the return pipe 107 of the heating system. The drain water that has entered the return pipe 107 is sent to the cistern 113 and circulates in the heating system. Here, since drain water is diluted with the water circulating in the heating system, corrosion of piping and the like can be prevented. Further, the water supply water pipe 117 is connected to the cistern 113, and the drain in the cistern 113 is mixed with an appropriate amount of tap water to reduce the alkalinity. Moreover, calcium carbonate may be enclosed in the cistern 113 as a neutralizing agent.
[0038]
When the amount of water in the heating system increases due to the confluence of the drain water and the water level of the cistern 113 reaches a high water level, the electromagnetic valve 17 provided in the terminal drain pipe 15 branched from the heating return pipe 107 is opened, and the water level is changed. The water in the heating system is drained from the terminal drain pipe 15 to a sink, a waterproof pan or the like until it falls to a predetermined value.
[0039]
With such a configuration, the drain water or the overflow of the cistern can be drained without providing a long drain pipe extending from the water heater to the drainage place.
[0040]
FIG. 2 is a diagram schematically showing a configuration of a main body and a main piping system of a latent heat recovery type hot water heater according to a second embodiment of the present invention.
This water heater 30 is different from the water heater in FIG. 1 except for the structure of the drain receiver, the piping in the vicinity of the drain receiver, the distribution in the vicinity of the cistern, and the piping for the heating device. Structure and action.
[0041]
The water heater 30 is not provided with a drain receptacle, and the drainage pipe is not provided in the cistern 113. The drain pipes 81 and 123 extending from the drain pans 79 and 121 are directly connected to the cistern 113. In the heating system 53, the terminal drain pipe 15 branches from the upstream of the header 109 of the return pipe 107. The terminal drain pipe 15 is provided with an electromagnetic valve 17 and the terminal is open. Here, the end is connected to a kitchen sink that easily drains, a waterproof pan of a washing machine, and the like. In such a place, a drain pipe can be easily drawn from a nearby heating system.
[0042]
With such a configuration, the drain accumulated in the trays 79 and 121 is accumulated in the cistern 113. When the water level of the cistern 113 reaches a high water level, the solenoid valve 17 provided in the terminal drain pipe 15 branched from the heating return pipe 107 is opened, and from the terminal drain pipe 15 into the heating system until the water level drops to a predetermined value. Drain the water into a sink or waterproof pan.
[0043]
【The invention's effect】
As apparent from the above invention, according to the present invention, since the drain accumulated in the drain receiver is sent to the heating system, it is possible to provide a latent heat recovery type water heater that does not require piping work for drain drainage. Further, if the drain receiver is also used as a cistern, the parts can be shared, and the size and cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing a configuration of a main body and a main piping system of a latent heat recovery type hot water heater according to a first embodiment of the present invention.
FIG. 2 is a diagram schematically showing a configuration of a main body and a main piping system of a latent heat recovery type hot water heater according to a second embodiment of the present invention.
FIG. 3 is a diagram schematically showing a configuration of a main body and a main piping system of a conventional representative latent heat recovery type water heater.
[Explanation of symbols]
10, 30 Water heater 11 Drain pipe 13 Drain solenoid valve 15 Terminal drain pipe 17 Solenoid valve 79, 121 Sauce pan 81, 123 Drain pipe

Claims (3)

A water heater body, and a heating system having a circulation line for supplying hot water from the body to the heating device,
The water heater body is
With a gas burner,
A latent heat recovery heat exchanger that heats water by the latent heat of water vapor in the combustion exhaust gas of the burner;
A drain receiver for receiving a drain containing condensed water generated in the heat exchanger;
A drain delivery system for sending the drain accumulated in the drain receptacle to the circulation line of the heating system;
Bei to give a,
The drain receiver is a systern of the heating system;
The heating system is provided with a terminal having an opening / closing mechanism,
A latent heat recovery type hot water supply, wherein a water level sensor is attached to the systern, and when the water level detected by the water level sensor reaches a predetermined water level, the opening / closing mechanism is opened to drain the heating system from the terminal. vessel. Neutralizing agent to the cistern is filled, or, latent heat recovery type water heater according to claim 1, wherein the neutralizing agent injection means is attached. Latent heat recovery type water heater according to claim 1, wherein the tap water injection means is attached to the cistern.

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