JP4867282B2 - Water heater - Google Patents

Description

  The present invention relates to a hot water supply heat exchanger that is heated by combustion heat of a burner, and a hot water supply device that includes a latent heat recovery heat exchanger that recovers latent heat of combustion exhaust gas, and in particular, the hot water supply heat exchanger and the latent heat recovery device. The present invention relates to a hot water supply apparatus in which a use side heat exchanger is provided in a hot water supply circulation circuit for circulating hot water heated by a heat exchanger.

Conventionally, as this type of combustion apparatus, as disclosed in Patent Document 1, a hot water supply heat exchanger that heats water supplied through a water supply path by combustion of a burner to supply hot water to the hot water supply path, and heating supplied through an inlet path A hot water supply apparatus provided with a fluid heat exchanger that heats a target fluid by combustion of the burner and flows out to an outlet, and the hot water heat exchanger recovers sensible heat of combustion exhaust gas of the burner A sensible heat exchange unit for hot water supply, and a latent heat heat exchange unit for hot water supply that is disposed downstream of the sensible heat exchange unit for hot water supply in the flow direction of the combustion exhaust gas of the burner and recovers the latent heat of the combustion exhaust gas of the burner The fluid heat exchanger recovers sensible heat of the combustion exhaust gas of the burner, and the combustion exhaust gas of the burner than the fluid sensible heat exchange unit. Arranged downstream of the flow direction of And a fluid latent heat exchange part for recovering the latent heat of the combustion exhaust gas of the burner, and the sensible heat exchange part for hot water supply and the sensible heat exchange part for fluid are integrated in a state of conducting heat to each other. And a hot water supply device in which the latent heat heat exchange part for hot water supply and the latent heat heat exchange part for fluid are integrally formed in a state of conducting heat to each other are disclosed (for example, see Patent Document 1). .
JP 2002-267262 A

  However, in the conventional hot water supply apparatus, a hot water heat exchanger and a fluid heat exchanger are respectively arranged in the flow path of the combustion gas of the burner, and a sensible heat exchanger for hot water supply and a hot water supply are provided in the hot water heat exchanger. And a fluid sensible heat exchange section and a fluid latent heat exchange section are provided in the fluid heat exchanger, so that hot water is supplied to the sensible heat exchange section and the latent heat exchange section respectively. Therefore, the heat exchanger for fluid and the heat exchanger for fluid need to be formed integrally, and a very complicated configuration has been imposed as a heat exchanger for hot water supply and a heat exchanger for fluid. In particular, when the structure of the latent heat exchange section is a double pipe structure using a stainless steel pipe and a copper pipe in order to improve the corrosion resistance, there is a problem in workability.

  In addition, since two paths for hot water supply and fluid are formed as the paths heated by the burner, the piping configuration becomes complicated and the boiling of the residual water in the heat exchanger on the shutdown side during single operation It has a problem of generating.

  The present invention solves the above-mentioned conventional problems, and forms one heating path with a hot water supply heat exchanger and a latent heat recovery heat exchanger, and uses circulating water in the heating path to form a heating circuit or a bath circuit. By adopting a structure for supplying heat, it is possible to configure a use-side heat exchanger that is not related to the heat exchanger for hot water supply and the latent heat recovery heat exchanger. It is possible to provide a hot water supply device that is easy to use and prioritizes hot water supply performance by realizing a reduction in weight and weight and making the heating path mainly a hot water supply circuit. In addition, by adopting a single heating path configuration mainly composed of a hot water supply circuit, the configuration for improving the corrosion resistance of the latent heat recovery heat exchanger is solved while solving the problem of residual water boiling in the heat exchanger during single operation. It is an object of the present invention to provide a hot water supply device that is easy and has high efficiency and reduced running costs.

In order to solve the conventional problems, a hot water supply apparatus of the present invention includes a heat exchanger for hot water supply that heats water supplied from a water supply path by combustion of a burner and supplies hot water to a hot water path,
A latent heat recovery heat exchanger that is disposed in the combustion exhaust gas path of the burner and recovers the latent heat of the combustion exhaust gas ;
Connect the latent heat recovery heat exchanger and the heat exchanger for the hot water supply in series, the hot water circulation throughout the use-side heat exchanger via the through circulation pump hot water supply heat exchanger from the latent heat recovery heat exchanger to form a circuit, said branched from the hot water supply circulation circuit to form a water supply circuit leading to the tapping line, the hot water supply circulation circuit and whether to use either one of the hot water supply circuit, or a hot water circulation circuit and the hot water supply circuit at the same time A hot water supply circuit configured to select whether to use, or
A tray for collecting the acidic dew condensation water generated in the latent heat recovery heat exchanger, an acidic dew channel for guiding the acid dew condensation water to the neutralization tank, a neutralization tank having a neutralizing agent therein, and the neutralization tank A neutralization circuit for neutralizing acidic condensed water generated in the latent heat recovery heat exchanger , comprising a drain water channel for discharging the neutralized drain water out of the apparatus ;
Provided in the neutralization tank section, a water leakage discharge hole having an arbitrary cross-sectional shape balances the amount of water leakage from the hot water supply side circuit and the amount discharged from the water leakage discharge hole when water leakage occurs from the hot water supply side circuit. A water leakage detection means for detecting a water leakage flow rate from the hot water supply side circuit , and
In the water level rise in the neutralization tank, and a control means for detecting water leakage from the hot water supply side circuit in the latent heat recovery heat exchanger unit,
A plurality of the water leakage discharge holes having an arbitrary cross-sectional shape are provided, and each of the water leakage discharge hole representative positions is arranged in the neutralization tank unit at the same height, or the neutralization tank unit at a different height. Or a combination of the same height and a different height, placed in the neutralization tank
It is the structure to make .

In this way, by appropriately selecting the position of the plurality of water leakage discharge holes, the water leakage flow discharged from each water leakage discharge hole can be changed, and depending on the shape of the neutralization tank to be designed, the detected water leakage flow rate Resolution can be further improved.

  In addition, another hot water supply apparatus of the present invention includes a heat exchanger for hot water supply that heats water supplied from a water supply path by combustion of a burner and supplies hot water to a hot water supply path,
A latent heat recovery heat exchanger that is disposed in the combustion exhaust gas path of the burner and recovers the latent heat of the combustion exhaust gas;
The hot water supply heat exchanger and the latent heat recovery heat exchanger are connected in series, and the hot water circulation from the latent heat recovery heat exchanger through the hot water supply heat exchanger to the use side heat exchanger via the circulation pump Forming a circuit, forming a hot water supply circuit that branches from the hot water supply circulation circuit and leads to a hot water supply path, and uses either the hot water supply circulation circuit or the hot water supply circuit, or simultaneously uses the hot water supply circulation circuit and the hot water supply circuit. A hot water supply circuit configured to select whether to use, or
A tray for collecting the acidic dew condensation water generated in the latent heat recovery heat exchanger, an acidic dew channel for guiding the acid dew condensation water to the neutralization tank, a neutralization tank having a neutralizing agent therein, and the neutralization tank A neutralization circuit for neutralizing acidic condensed water generated in the latent heat recovery heat exchanger, comprising a drain water channel for discharging the neutralized drain water out of the apparatus;
Provided in the neutralization tank section, a water leakage discharge hole having an arbitrary cross-sectional shape balances the amount of water leakage from the hot water supply side circuit and the amount discharged from the water leakage discharge hole when water leakage occurs from the hot water supply side circuit. A water leakage detection means for detecting a water leakage flow rate from the hot water supply side circuit, and
Control means for detecting water leakage from the hot water supply side circuit in the heat exchanger section for latent heat recovery when the water level in the neutralization tank rises, and disposed in the drain water channel for discharging the drain water out of the device Drain water discharge pump;
With
The leakage water level electrode also serves as a switch function for starting the drain water discharge pump,
The control means controls to start driving the drain water discharge pump by ON operation of the leakage water level electrode during burner combustion, and to drive the drain water discharge pump for a predetermined time from the ON operation of the leakage water level electrode. It is. In the case where a drain water discharge pump for discharging drain water to the outside of the apparatus is arranged in the drain water channel as a device configuration, it refers to a method of driving control of the drain water discharge pump performed by the control means. It is characterized in that it also has a switch function for driving a drain water discharge pump. At this time, the control means performs operation control for driving the drain water discharge pump for a predetermined time when the leakage water level electrode is turned ON during burner combustion. In this way, the leakage water level electrode can be a switch function for the control means to drive the drain water discharge pump.

The water heater of the present invention can change the leakage flow rate discharged from each leakage discharge hole by appropriately selecting the arrangement position of the plurality of leakage discharge holes, and according to the neutralization tank shape to be designed The resolution of the detected water leakage flow rate can be further improved.

In addition, another hot water supply apparatus of the present invention has a device configuration in which a drain water discharge pump is controlled by the control means when a drain water discharge pump for discharging drain water to the outside of the apparatus is disposed in the drain water channel. This method is characterized in that the function of the leaked water level electrode is combined with a switch function for driving the drain water discharge pump. At this time, the control means performs operation control for driving the drain water discharge pump for a predetermined time when the leakage water level electrode is turned ON during burner combustion. In this way, the leakage water level electrode can be a switch function for the control means to drive the drain water discharge pump.

The present invention comprises a heat exchanger for hot water supply that heats water supplied from a water supply path by combustion of a burner and supplies hot water to a hot water supply path,
A latent heat recovery heat exchanger that is disposed in the combustion exhaust gas path of the burner and recovers the latent heat of the combustion exhaust gas ;
Connect the latent heat recovery heat exchanger and the heat exchanger for the hot water supply in series, the hot water circulation throughout the use-side heat exchanger via the through circulation pump hot water supply heat exchanger from the latent heat recovery heat exchanger to form a circuit, said branched from the hot water supply circulation circuit to form a water supply circuit leading to the tapping line, the hot water supply circulation circuit and whether to use either one of the hot water supply circuit, or a hot water circulation circuit and the hot water supply circuit at the same time A hot water supply circuit configured to select whether to use, or
A tray for collecting the acidic dew condensation water generated in the latent heat recovery heat exchanger, an acidic dew channel for guiding the acid dew condensation water to the neutralization tank, a neutralization tank having a neutralizing agent therein, and the neutralization tank A neutralization circuit for neutralizing acidic condensed water generated in the latent heat recovery heat exchanger , comprising a drain water channel for discharging the neutralized drain water out of the apparatus ;
Provided in the neutralization tank section, a water leakage discharge hole having an arbitrary cross-sectional shape balances the amount of water leakage from the hot water supply side circuit and the amount discharged from the water leakage discharge hole when water leakage occurs from the hot water supply side circuit. A water leakage detection means for detecting a water leakage flow rate from the hot water supply side circuit , and
In the water level rise in the neutralization tank, and a control means for detecting water leakage from the hot water supply side circuit in the latent heat recovery heat exchanger unit,
With
A plurality of the water leakage discharge holes having an arbitrary cross-sectional shape are provided, and each of the water leakage discharge hole representative positions is arranged in the neutralization tank unit at the same height, or is arranged in the neutralization tank unit at a different height. It is the structure which is arrange | positioned in the neutralization tank part combining the structure or the same height and different height.
One heating path is formed by the heat exchanger for hot water supply and the heat exchanger for recovering latent heat, and the amount of heat is supplied to the heating circuit or bath circuit using the circulating water of the heating path. It is possible to configure the use-side heat exchanger not related to the heat exchanger or the latent heat recovery heat exchanger, and the simplification of the main body structure including the piping structure realizes downsizing and weight reduction of the appliance, and the heating path is An easy-to-use hot water supply apparatus that prioritizes hot water supply performance can be provided by using a hot water supply circuit as a main component, and a single heat path configuration that mainly includes a hot water supply circuit enables a heat exchanger during single operation. It is possible to provide a hot water supply apparatus that solves the problem of boiling of residual water and facilitates the configuration for improving the corrosion resistance of the heat exchanger for recovering latent heat, and that is highly efficient and reduces running costs.

Further, by providing a water leakage detection means in the neutralization circuit for neutralizing the acidic dew condensation water generated in the latent heat recovery heat exchanger, a slight leak from the hot water supply side circuit in the latent heat recovery heat exchanger section is provided. Can be detected, and it can be detected at an early stage that water leakage has occurred. If the water pipe of the latent heat recovery heat exchanger breaks and water leaks from the hot water supply side circuit, the leak is collected in the tray and flows through the neutralization circuit. Can do. As the water leakage flow rate detection means, for example, a flow sensor that detects the actual flow rate with an output pulse corresponding to the rotation of an impeller provided in the flow channel according to the flow rate of water flow, There is a flow rate switch that detects flowing water when the butterfly portion, to which the magnet is attached, is pushed up at a predetermined flow rate or more to conduct electricity. Further, if water leakage is constantly generated from the hot water supply side circuit, the amount of water leakage from the hot water supply side circuit and the discharge amount from the water leakage discharge hole in the neutralization tank are balanced and settled at a certain water level. At this time, if a water leakage level electrode is provided in the neutralization tank and a balanced water level rise can be detected, water leakage from the hot water supply side circuit can be detected. In addition, by appropriately selecting the location of the plurality of leak discharge holes in this way, the leak flow rate discharged from each leak discharge hole can be changed and detected according to the neutralization tank shape to be designed. The resolution of the leakage flow rate can be further improved.

In addition , when a plurality of use-side heat exchangers are provided, each heat exchanger is connected in parallel to the hot water supply circulation circuit so that the hot water temperature supplied from the hot water heat exchanger is substantially the same. It is characterized by the fact that the passage resistance of the hot water supply circulation circuit is reduced by connecting a plurality of use side heat exchangers in parallel to the hot water supply circulation circuit consisting of a hot water supply heat exchanger and a latent heat recovery heat exchanger. Therefore, the circulation pump can be reduced in size and weight.

Further , the branch portion from the hot water supply circulation circuit of the hot water supply passage is arranged upstream of the use side heat exchanger, and the branch portion is arranged immediately downstream of the hot water heat exchanger. When the circuit is used alone, it is possible to reduce the flow pressure loss of the tap water passage and to supply hot water to the tap water passage quickly.

Further , the branch part from the hot water supply circulation circuit of the hot water supply passage is arranged downstream of the use side heat exchanger, and the branch part is arranged downstream of the use side heat exchanger, thereby providing a hot water supply circuit. and the case of using the hot water circulation circuit at the same time, it is possible to supply a large flow rate by feeding hot water circulation circuit, it is possible to supply a large amount of heat by the utilization-side heat exchanger.

It was leakage flow rate from the hot water supply side circuit to be detected For example is a 0.1 L / min. At this time, if the water discharge hole is easy to discharge the water by increasing the cross-sectional area as the shape condition, the head difference under the balanced atmospheric pressure may be small. Further, as a shape condition, if the cross-sectional area is reduced and the water leakage hole is difficult to discharge water, the head difference under the balanced atmospheric pressure becomes large. That is, even when detecting the same water flow rate of 0.1 L / min, for example, when it is desired to save space in the design of the neutralization tank, the water leakage level hole is connected to the water leakage level hole with a water leakage outlet hole having a large cross-sectional area. In order to prevent erroneous detection as much as possible and detect the leakage water flow with high accuracy, the leakage water level electrode may be disposed away from the leakage discharge hole with a leakage discharge hole having a reduced cross-sectional area.

Further , the present invention is characterized in that the water leaked from the water leak hole is discharged to the drain water channel. If the drainage from the leak hole and the drainage of the neutralized drain water are separately discharged outside the device, it will be complicated in design, so simplifying the device configuration by combining these drainage paths. Can do.

In the configuration of the one discharge path of the discharge path and drain water from the water leakage discharge hole, it is characterized by realizing the configuration in union of neutralizing tank and the drain water channel, designed and apparatus al The configuration can be simplified.

In addition, it refers to the shape of the water leakage discharge hole of any shape, and is characterized in that the cross-sectional shape is a particularly simple circular shape for processing, and the cost can be reduced by simplifying the processing of the water leakage discharge hole. Can do.

In addition, it refers to the shape of the water leakage discharge hole of any shape, and is characterized by the fact that the cross-sectional shape is made into a slit shape that is easy to process, and the cost can be reduced by simplifying the processing of the water leakage discharge hole. Can do.

In addition, another hot water supply apparatus of the present invention includes a heat exchanger for hot water supply that heats water supplied from a water supply path by combustion of a burner and supplies hot water to a hot water supply path,
A latent heat recovery heat exchanger that is disposed in the combustion exhaust gas path of the burner and recovers the latent heat of the combustion exhaust gas;
The hot water supply heat exchanger and the latent heat recovery heat exchanger are connected in series, and the hot water circulation from the latent heat recovery heat exchanger through the hot water supply heat exchanger to the use side heat exchanger via the circulation pump Forming a circuit, forming a hot water supply circuit that branches from the hot water supply circulation circuit and leads to a hot water supply path, and uses either the hot water supply circulation circuit or the hot water supply circuit, or simultaneously uses the hot water supply circulation circuit and the hot water supply circuit. A hot water supply circuit configured to select whether to use, or
A tray for collecting the acidic dew condensation water generated in the latent heat recovery heat exchanger, an acidic dew channel for guiding the acid dew condensation water to the neutralization tank, a neutralization tank having a neutralizing agent therein, and the neutralization tank A neutralization circuit for neutralizing acidic condensed water generated in the latent heat recovery heat exchanger, comprising a drain water channel for discharging the neutralized drain water out of the apparatus;
Provided in the neutralization tank section, a water leakage discharge hole having an arbitrary cross-sectional shape balances the amount of water leakage from the hot water supply side circuit and the amount discharged from the water leakage discharge hole when water leakage occurs from the hot water supply side circuit. A water leakage detection means for detecting a water leakage flow rate from the hot water supply side circuit, and
Control means for detecting water leakage from the hot water supply side circuit in the heat exchanger section for latent heat recovery when the water level in the neutralization tank rises, and disposed in the drain water channel for discharging the drain water out of the device Drain water discharge pump;
With
The leakage water level electrode also serves as a switch function for starting the drain water discharge pump,
The control means controls to start driving the drain water discharge pump by ON operation of the leakage water level electrode during burner combustion, and to drive the drain water discharge pump for a predetermined time from the ON operation of the leakage water level electrode. It is.
Thereby, one heating path is formed by the heat exchanger for hot water supply and the heat exchanger for latent heat recovery, and the heat amount is supplied to the heating circuit and the bath circuit using the circulating water of the heating path. Enables the configuration of the use side heat exchanger that is not related to the hot water supply heat exchanger or the latent heat recovery heat exchanger. By using a hot water supply circuit as a main route, it is possible to provide an easy-to-use hot water supply device that prioritizes hot water supply performance, and by adopting a single heating route configuration mainly consisting of a hot water supply circuit, It is possible to provide a hot water supply apparatus that solves the problem of residual water boiling in the exchanger, facilitates the structure for improving the corrosion resistance of the latent heat recovery heat exchanger, and achieves high efficiency and reduced running costs. Furthermore, by providing a water leakage detection means in the neutralization circuit for neutralizing the acidic dew condensation water generated in the latent heat recovery heat exchanger, a slight leak from the hot water supply side circuit in the latent heat recovery heat exchanger section can be prevented. It becomes possible to detect and it is possible to detect at an early stage that water leakage has occurred. In addition, the water pipe of the heat exchanger for recovering latent heat is damaged and water leaks from the hot water supply side circuit.
In such a case, the leaked water is collected in the tray and flows through the neutralization circuit, so that the leakage from the hot water supply circuit can be detected. As the water leakage flow rate detection means, for example, a flow sensor that detects the actual flow rate with an output pulse corresponding to the rotation of an impeller provided in the flow channel according to the flow rate of water flow, There is a flow rate switch that detects flowing water when the butterfly portion, to which the magnet is attached, is pushed up at a predetermined flow rate or more to conduct electricity. Further, if water leakage is constantly generated from the hot water supply side circuit, the amount of water leakage from the hot water supply side circuit and the discharge amount from the water leakage discharge hole in the neutralization tank are balanced and settled at a certain water level. At this time, if a water leakage level electrode is provided in the neutralization tank and a balanced water level rise can be detected, water leakage from the hot water supply side circuit can be detected. In addition, as a device configuration, when a drain water discharge pump for discharging drain water to the outside of the device is arranged in the drain water channel, it refers to a method of driving control of the drain water discharge pump performed by the control means. It is characterized in that the function of the water level electrode is combined with a switch function for driving a drain water discharge pump. At this time, the control means performs operation control for driving the drain water discharge pump for a predetermined time when the leakage water level electrode is turned ON during burner combustion. In this way, the leakage water level electrode can be a switch function for the control means to drive the drain water discharge pump.

In addition , the control means mentioned the drive control method of the drain water discharge pump, and the control means drives the drain water discharge pump when the leakage water level electrode is turned ON during burner combustion, and after the leakage water level electrode is turned OFF. Operation control to drive the drain water drain pump for a predetermined time is performed. By driving the drain water drain pump for a predetermined time after the leakage water level electrode OFF operation, the drain water in the neutralization circuit can be discharged more reliably.

In addition , the control means refers to a method for controlling the drain water discharge pump, and the control means, during burner combustion, drains water based on the time from ON to ON of the leakage water level electrode or the time from OFF to OFF. The driving time of the water discharge pump is determined. At the time of burner combustion, the amount of drain water generated changes according to various conditions such as weather conditions such as temperature and humidity, incoming water temperature conditions, combustion load conditions, and the like. Therefore, when the drain water drain pump is always driven for a predetermined time during any burner combustion, the drain water in the neutralization circuit can be sufficiently discharged out of the device when the amount of drain water to be generated is large. If the amount of drain water generated is small, or the drain water in the neutralization circuit is discharged outside the apparatus, the drain water discharge pump may idle. Therefore, the control means determines the driving time of the drain water discharge pump based on the time from ON to ON of the leakage water level electrode or the time from OFF to OFF, and the drain water at a more appropriate time based on this time. The discharge pump can be driven.

Further , the present invention is characterized in that the function of the leaked water level electrode also functions as an electrode for detecting the ph concentration of contact water. Here, as the contact water, drain water neutralized in the neutralization tank at the time of burner combustion is leaked when water leaks from the hot water supply side circuit. In the neutralization tank, it is necessary to reliably neutralize the acid condensed water generated in the heat exchanger for latent heat recovery. If this function is applied, the ph concentration of the drained water after neutralization is measured. Therefore, it can be used as an index of the neutralization function in the neutralization tank.

In addition to detecting the water level rise in the neutralization tank, by applying a function for detecting the ph concentration contacting water with leakage water level electrode, it is possible to detect more accurately water leakage from the hot water supply side circuit it can. That is, when the control means detects a leak due to a rise in the water level in the neutralization tank, and simultaneously detects the ph concentration of the contact water, and if this ph concentration exceeds a predetermined value, water leaks from the hot water supply side circuit. It is possible to increase the accuracy of water leakage detection by determining that it is being performed.

It also has the function of detecting the ph concentration of drain water during burner combustion using the function of detecting the ph concentration of contact water by the leaked water level electrode and determining the amount of neutralizing agent in the neutralization tank. It is characterized by. If neutralization of acidic dew condensation water generated in the latent heat recovery type heat exchanger over time is continued, the amount of neutralizing agent in the neutralization tank decreases and the neutralization performance deteriorates. Therefore, if the ph concentration of the drain water during burner combustion is detected and this value is less than a predetermined value, the control means can determine that the amount of neutralizing agent in the neutralizing tank has decreased.

In addition , when there is water leakage from the hot water supply side circuit, the control means is left in an external notification main stage such as a remote control remote controller, and by performing an operation to stop the operation of the device after a predetermined period, Expanding damage due to water leakage can be suppressed.

Also , when the control means determines that the amount of neutralizing agent in the neutralization tank is insufficient, it is left in the external notification main stage such as a remote control remote controller, and after a predetermined period, By performing the operation to stop the operation, it is possible to suppress damage caused by discharging acidic drain water due to a decrease in neutralization function outside the apparatus.

(Embodiment 1)
FIG. 1 is a structural view of a hot water supply apparatus according to first, second, fourth, fifth, sixth, fifteenth, nineteenth and twenty-third embodiments of the present invention.

  In FIG. 1, the water supplied from the water supply channel 1 is heated by combustion of the burner 26, raised to a predetermined temperature, then supplied to the hot water supply channel 3, and the water supply channel 1 and the hot water supply channel 3 are connected to each other. A part of the water supplied from the bypass passage 4 through the bypass water supply path 1 is supplied via the bypass control valve 9 to adjust the hot water at a desired temperature, and a hot water supply circuit for discharging hot water from the hot water tap 13 is configured.

When the hot-water tap 13 is opened and the incoming flow rate sensor 5 detects an incoming flow rate of a predetermined amount (for example, 2.8 L / min) or more, the burner 26 has a gas source solenoid valve 22, a gas proportional valve 23, and a gas switching valve 24. The fuel gas is supplied from the gas supply path 21 in which is disposed, the combustion air is supplied by the combustion fan 25, and the combustion operation is performed according to a predetermined sequence. Here, as the incoming water flow rate sensor 5, for example, a configuration of a flow rate sensor in which an impeller provided in the flow path rotates according to the water flow rate and an actual flow rate is detected by an output pulse corresponding to the rotation is conceivable. . The combustion gas generated by the combustion of the burner 26 passes through the combustion chamber 30, passes through the exhaust passage 31, and is discharged from the exhaust port 32 to the outside of the apparatus. A hot water supply heat exchanger 33 that recovers sensible heat of the combustion gas and a latent heat recovery heat exchanger 34 that recovers the latent heat of the combustion exhaust gas are disposed in the exhaust path of the combustion gas. Specifically, a hot water supply heat exchanger 33 is provided in the combustion chamber 30 on the downstream side of the burner 26, a latent heat recovery heat exchanger 34 is provided in the exhaust passage 31 on the downstream side, and supplied from the water supply path 1. Water is first supplied to the latent heat recovery heat exchanger 34 to recover the latent heat in the combustion exhaust gas, and then supplied to the hot water supply heat exchanger 33 and heated to a predetermined high temperature water by the combustion of the burner 26, and the hot water outlet. 3 is supplied. In this way, in addition to the sensible heat recovery by the conventional hot water supply heat exchanger 33, by providing the latent heat recovery heat exchanger 34 for recovering the latent heat of the combustion exhaust gas, energy saving is achieved by improving the overall thermal efficiency. It is.

  Next, in FIG. 1, high-temperature water heated by the latent heat recovery heat exchanger 34 and the hot water supply heat exchanger 33 is supplied to the use side heat exchanger via the circulation pump 7, and then the latent heat recovery heat exchange is performed. The hot water supply circulation circuit 2 is returned to the upstream water supply passage 1 of the heat exchanger 34 and passes from the latent heat recovery heat exchanger 34 through the hot water supply heat exchanger 33 to the utilization side heat exchanger via the circulation pump 7. This hot water supply circulation circuit 2 can supply heat to the secondary side load of the usage side heat exchanger by supplying high temperature water as a primary side circuit of the usage side heat exchanger. Here, as the use-side heat exchanger, a heating heat exchanger 52 having a heating circuit 41 for supplying warm water to a heating terminal that performs heating, bathroom drying, or the like as a secondary side, and the bathtub water of the bathtub 77 are heated. In this example, two bath heat exchangers 80 having the bath circuit 61 to be used as the secondary side are provided. The hot water circulation circuit 2 is branched in parallel and supplied as primary circuits of the heat exchanger 52 for heating and the heat exchanger 80 for bath, whereby the high-temperature water temperature supplied to each use-side heat exchanger Can be substantially the same. Here, a case where a bath opening / closing valve 78 for opening / closing a flow path is provided in the primary side circuit of the bath heat exchanger 80 is shown. By providing the bath opening / closing valve 78, the heating heat exchanger 52 is opened by opening the bath opening / closing valve 78 only when high temperature water is desired to be supplied to the primary circuit of the bath heat exchanger 80. It is possible to supply a large amount of high-temperature water to the primary side circuit, thereby increasing the heating output.

  In the hot water supply circulation circuit 2, the hot water supply passage 3 is branched from the downstream side of the use side heat exchanger of the heating heat exchanger 52 and the bath heat exchanger 80. In this way, by arranging the branch portion downstream of the use side heat exchanger, when the hot water supply circuit and the hot water supply circulation circuit 2 are used simultaneously, a large amount of high temperature water is supplied to the hot water supply circulation circuit 2. Therefore, a large amount of heat can be supplied to the secondary side circuit of the use side heat exchanger.

  The heating circuit 41 connects a load of a heating terminal such as a bathroom dryer to the secondary side of the heating heat exchanger 52 to form a closed circuit, and circulates the secondary side hot water by the heating circulation pump 50. Thus, in the heating heat exchanger 52, the amount of heat is supplied from the high-temperature water flowing through the hot water supply circulation circuit 2 which is the primary side.

  The bath circuit 81 is connected to the secondary side of the bath heat exchanger 80 to form a closed circuit, and the bath water is circulated by the bath circulation pump 75 so that 1 in the bath heat exchanger 80. The amount of heat is supplied from the high-temperature water flowing through the hot water supply circulation circuit 2 on the next side, and the bath is replenished. In addition, as a pouring flow path 64 for filling the bathtub 77 with a predetermined amount of hot water, a path communicating from the hot water discharge path 3 on the downstream side of the bypass path 4 to the bath circuit 61 is formed.

The neutralization circuit has a function of neutralizing the acid condensed water generated in the latent heat recovery heat exchanger 34 and discharging it to the outside of the apparatus. When the water supplied from the water supply channel 1 is heat-exchanged by the combustion exhaust gas in the latent heat recovery heat exchanger 34, the combustion exhaust gas is cooled by water and dew condensation water is generated. In this condensed water, components such as CO ₂ and NOx in the combustion exhaust gas are dissolved, and usually exhibits acidity of ph2 to 3. The generated acidic dew condensation water is collected by the tray 101, passes through the acid dew condensation water channel 102, is guided to the neutralization tank 104 having a neutralizing agent 103 such as calcium carbonate inside, and neutralized, and then from the drain water channel 105. It is discharged out of the device.

  About the hot water supply apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, during the hot water supply operation, when the hot water tap 13 is opened, the incoming water flow rate sensor 5 disposed in the water supply passage 1 detects water flow, and the combustion fan 25 is operated by this water flow signal and simultaneously the gas source solenoid valve 22 and the gas. The proportional valve 23 is opened, fuel gas and combustion air are supplied to the burner 26, ignited by spark discharge of the ignition plug 28 by the igniter 27, and combustion is started by the ignition recognition operation by the frame rod 29. The amount of combustion in the burner 26 according to the combustion load is adjusted by opening and closing the gas switching valve 24. In the process of exhausting the combustion gas, the water supplied from the water supply path 1 is heated by the hot water supply heat exchanger 33 disposed in the combustion chamber 30 and the latent heat recovery heat exchanger 34 disposed in the exhaust passage 31. The

  The hot water heated by the hot water supply heat exchanger 33 passes through a bypass passage 4 provided in communication with the hot water supply path 1 and the hot water supply path 3 so as to bypass the hot water supply heat exchanger 33 and the latent heat recovery heat exchanger 34. The bypass control valve 9 provided is mixed with water on the incoming side. The opening of the bypass control valve 9 is adjusted by a signal from the hot water thermistor 17 so that the mixed hot water has a hot water supply set temperature set by a remote controller for remote operation such as a bathroom remote controller 92 or a kitchen remote controller 93, and the hot water tap 13 More hot water is supplied.

  Thus, when selecting hot water supply independent operation, a desired temperature can be set with the remote controller for remote operation, and the hot water supply hot water set automatically can be secured by opening the hot water tap 13. .

  Next, at the time of heating operation, a heating circulation pump 50 provided in the heating circuit 41 is driven by an operation command from a controller (not shown) built in a heating terminal such as a bathroom dryer or a heating remote controller 94. The circulation pump 7 that circulates the hot water in the hot water supply circulation circuit 2 is driven in conjunction with the operation command, and at the same time, combustion is started by the ignition operation of the burner 26. The high-temperature water heated by the hot water supply heat exchanger 33 is supplied to the primary side of the heating heat exchanger 52 by the circulation pump 7 and is heat-exchanged by the water-water heat exchange configuration and transmitted to the secondary side heating circuit 41. Be heated.

  The heating circuit 41 of FIG. 1 shows a two-temperature type configuration that can supply hot water having two different temperatures to the heating terminal. The hot water of the heating circuit 41 heated by the heating heat exchanger 52 is supplied as it is through the heating forward flow path 42 when used in a high-temperature terminal such as a bathroom dryer. When used in a low-temperature terminal such as a floor heating hot water mat, the return hot water from each heating terminal stored in the heating tank 53 through the heating return passage 44 is a low-temperature bypass having a check valve 49. It is mixed with the high temperature water flowing through the flow path 45 and supplied through the low temperature heating forward flow path 43.

The heating tank 53 is provided with a water reducing electrode 54 that detects the amount of water retained in the heating circuit 41 that has decreased due to evaporation or the like, and a full water electrode 55 that detects the amount of retained water. A make-up water channel 47 having 48 is connected. When the water-reducing electrode 54 is turned off and the amount of water held in the heating tank 53 is less than the water-reducing electrode 54, the make-up water electromagnetic valve 48 is opened, and water from the make-up water channel 47 enters the heating tank 53 until the full-water electrode 55 is turned on. It is a mechanism to be supplied.

  The high-temperature water heat-exchanged by the heating heat exchanger 52 is returned to the upstream water supply channel 1 of the latent heat recovery heat exchanger 34 to form a hot water supply circulation circuit 2, and a heating operation command is issued from the heating terminal. During this time, the hot water circulation is continued while maintaining the predetermined temperature.

  At the time of bath rebirth operation, when a bath rebirth operation instruction is given by a remote controller for remote operation such as the bathroom remote controller 92, the bath circulation pump 75 provided in the bath circuit 61 is driven, and the water flow detector 74 circulates the bath water. Is detected, the circulation pump 7 that circulates the hot water supply circulation circuit 2 is driven by the detection signal, the bath opening / closing valve 78 is opened, and at the same time, combustion is started by the ignition operation of the burner 26. Here, as the water flow detection unit 74, for example, a butterfly unit provided in a flow path and having a magnet attached thereto is pushed up at a flow rate of a predetermined (eg, 2.8 L / min) or more to be electrically connected, thereby flowing water. A configuration of a flow rate switch to be detected is conceivable.

  The high-temperature water heated by the hot water supply heat exchanger 33 is supplied by the circulation pump 7 to the primary side of the bath heat exchanger 80 in which the bath open / close valve 78 is opened, and heat exchange is performed by the water-water heat exchange configuration. Then, heat is transferred to the bath circuit 61 on the secondary side. The heat of the bath circuit 61 received by the bath heat exchanger 80 raises the bath water temperature of the bathtub 77 to ensure a predetermined reheating water temperature. And the high temperature water heat-exchanged with the heat exchanger 80 for baths returns to the upstream water supply path 1 of the heat exchanger 34 for latent heat recovery, forms the hot water supply circulation circuit 2, and was set with the remote controller for remote operation Circulation is continued while maintaining a predetermined hot water temperature until a predetermined reheating temperature is detected by the bath return thermistor 79.

  In the hot water supply circulation circuit 2, a circulation flow sensor 6 having the same flow sensor configuration as the incoming water flow sensor 5 is disposed. By arranging the circulation flow rate sensor 6 in the hot water supply circulation circuit 2, it is possible to detect the circulation flow rate of the hot water supply circulation circuit 2. Therefore, if the circulation pump 7 is configured as a DC pump having a variable driving load, during the heating operation, the bath reheating operation, or the simultaneous operation thereof, depending on the secondary load of each use side heat exchanger, The optimum high-temperature water flow rate can be supplied by changing the driving load of the circulation pump 7.

  As described above, in the present embodiment, the hot water supply circuit and the hot water supply circulation circuit that is the primary circuit of the use side heat exchanger are configured by one heating path, thereby simplifying the main body configuration including the piping configuration. It is possible to reduce the size and weight of the device. Further, by improving the efficiency by recovering latent heat, it is possible to simultaneously ensure the hot water supply performance and the heating performance of the use side heat exchanger.

  Next, a detection method when the water pipe in the latent heat recovery heat exchanger 34 has a hole due to corrosion or the like and water leakage from the hot water supply side circuit will be described. When a hole is opened in the water pipe portion of the latent heat recovery heat exchanger 34 and a slight water leak occurs from the hot water supply circuit side, the water leak is recovered by the tray 101, and the acidic dew condensation water channel 102, the neutralization tank 104, and the drain water channel 105. Since it is discharged out of the apparatus via the neutralization circuit, a large amount of water may be wasted without the user noticing the leakage over time. Therefore, when a hole is opened in the water pipe portion in the latent heat recovery heat exchanger 34 and water leaks from the hot water supply circuit, this state is detected and a function of notifying the user is provided.

  FIG. 1 shows a state in which a leakage flow rate detecting means 111 for detecting the leakage flow rate is arranged in the acidic dew condensation water channel 102 when leakage from the hot water supply side circuit in the 34 part of the latent heat recovery type heat exchanger occurs. Yes. Here, as the water leakage flow rate detection means 111, for example, a flow rate sensor configuration such as the incoming flow rate sensor 5 or the circulating flow rate sensor 6 or a butterfly flow rate switch configuration such as the water flow detection unit 74 is applied. can do.

  When the burner 26 burns, acid dew condensation water is generated in the latent heat recovery heat exchanger 34. Therefore, if water leaks from the hot water supply side circuit in the latent heat recovery heat exchanger 34, the fluid flowing in the acid dew condensation channel 111 flows. It is difficult to determine whether it is acidic condensed water or leaked water. Therefore, it is necessary to make the timing for detecting water leakage appropriate.

  Hereinafter, an example of a method in which the control unit 91 detects water leakage, informs the state to an external notification unit such as a remote controller for remote operation, warns the user, and finally stops the operation of the apparatus will be described.

  In order for the control means 91 to detect water leakage, it is necessary not to erroneously detect the acid condensation water generated by the combustion of the burner 26 by the fluid flowing in the acid condensation water channel 111 as water leakage from the hot water supply side circuit. Therefore, for example, the following water leakage detection conditions are provided in the control means 91.

<Condition 1-1> Start Timing of Water Leak Detection Immediately after the burner 26 has stopped burning, it is considered that acidic dew condensation water remains in the neutralization circuit including the tray 101. Therefore, the control means 91 starts water leakage detection after a predetermined time (for example, 30 minutes) after the combustion of the burner 26 is stopped. Even when the burner 26 has stopped burning, if the operation switch of the remote controller for remote operation such as the bathroom remote controller 92, the kitchen remote controller 93, the heating remote controller 94, etc. is ON, the user immediately uses the device. Therefore, leakage detection is not performed.

<Condition 1-2> About water leakage detection flow rate The water leakage flow rate detected or detected by the water leakage flow rate detection means 111 is set to be a predetermined flow rate (for example, 0.1 L / min) or more. If a flow rate sensor configuration is applied to the leakage flow rate detection means 111, a setting of a predetermined flow rate or higher is detected. If a flow rate switch configuration is applied, the switch is turned on at a predetermined flow rate or higher.

<Condition 1-3> Water leakage detection time and number of times If the water leakage detection of <Condition 1-2> continues continuously for a predetermined time (for example, 30 minutes) or longer, the water leakage is detected once. Although the leak detection is performed once a day, the control means 91 always monitors the leak flow rate detection means 111 at the timing when the leak detection is possible, and even if one leak detection is confirmed within one day, If the water leak is not detected continuously for 30 minutes or more in the subsequent time, the established water leak detection is cleared once. If it is cleared, the control means 91 performs water leak detection again at the cleared stage.

<Condition 1-4> Change the date of water leakage detection and notify the external notification means When rain enters the exhaust port 32 under weather conditions or when water is accidentally entered from the exhaust port 32, A case where the water leakage detection of <Condition 1-3> is confirmed is conceivable. Accordingly, when the water leakage detection confirmation of <Condition 1-3> has reached a total predetermined number of times (for example, three times, that is, corresponding to three days), the control means 91 is 34 parts of the latent heat recovery type heat exchanger. It is determined that water leakage has occurred from the circuit, and this is notified to an external notification means such as a remote controller for remote control and a warning is given to the user.

  <Condition 1-5> The apparatus is stopped after a predetermined number of days have passed since the notification.

After a predetermined number of days (for example, 7 days) has elapsed since the occurrence of water leakage was notified to the external notification means of <Condition 1-4>, the control means 91 notifies the external notification means such as a remote controller for remote operation of the occurrence of water leakage. It is impossible to operate the device as it is. However, even after the occurrence of water leakage is notified to the external notification means, the control means 91 performs water leakage detection at a timing at which water leakage can be detected. If the above <Condition 1-3> is not satisfied, the water leakage detection is cleared and the external notification means Clear the leak occurrence notification.

  As described above, in the present embodiment, leakage from the hot water supply side circuit in the latent heat recovery type heat exchanger 34 is detected by the leakage flow rate detection means 111 provided in the acidic dew condensation channel 102, and the occurrence of water leakage is notified externally. By notifying the means to warn the user and finally performing operation control to stop the operation of the apparatus, it is possible to prevent a large amount of water from being wasted without being noticed by the user.

  Next, when the drain water discharge pump 113 is disposed in the drain water channel 105, the control unit 91 uses the signal from the water leakage flow rate detection unit 111 disposed in the acidic dew condensation water channel 102 to control the drain water discharge pump 113. The operation control when driving is described. Here, the drain water discharge pump 113 is for forcibly discharging the acid condensed water neutralized in the neutralization tank 104 from the drain water flow path 105 to the outside of the apparatus. When the flow rate of acidic dew condensation water detected by the water leakage flow rate detecting means 111 is detected at a predetermined value (for example, 0.1 L / min) or more during combustion of the burner 26, acid dew condensation water is generated in the latent heat recovery type heat exchanger 34. If so, the control means 91 can detect it. The control means 91 can turn on / off the driving of the drain water discharge pump 113 using the flow rate detection operation of the water leakage flow rate detection means 111. Hereinafter, an example of the ON / OFF operation of the drain water discharge pump 113 performed by the control means 91 will be described.

  First, when the water leakage flow rate detection means 111 detects a predetermined value (for example, 0.1 L / min) or more, the control means 91 starts a predetermined time (for example, 3 minutes) after a predetermined time (for example, 5 minutes) from the detection of the water leakage flow rate detection means 111. ) Operation control for turning on the drain water discharge pump 113 can be performed.

  Next, when the water leakage flow rate detecting means 111 detects a predetermined value (for example, 0.1 L / min) or more, the control means 91 starts the drain water discharge pump 113 after a predetermined time (for example, 5 minutes) from the detection of the water leakage flow rate detecting means 111. Is turned ON, and the operation control to turn off the drain water discharge pump 113 after a predetermined time (for example, 1 minute) after the leakage flow rate detecting means 111 detects less than a predetermined value (for example, 0.1 L / min) can be performed. .

  Further, it is based on the time from when the water leakage flow rate detecting means 111 detects a predetermined value (for example, 0.1 L / min) or more until it is detected again, or the time until it is detected again after detection of less than a predetermined value (for example, 0.1 L / min). In addition, it is possible to consider operation control for determining the drive time of the drain water discharge pump 113. The amount of acid condensed water generated during combustion of the burner 26 changes every time depending on various conditions such as weather conditions such as temperature and humidity, incoming water temperature conditions, combustion load conditions, etc. It is considered preferable to determine the driving time of the water discharge pump 113.

For example, after the start of combustion of the burner 26, the leakage flow rate detection means 111 first detects a predetermined value (for example, 0.1 L / min) or more, and then the time for initially driving the drain water discharge pump 113 is a predetermined time ΔT ₀ ( For example, 3 minutes). At this time, if the time until the water leakage flow rate detecting means 111 detects again a predetermined value (for example, 0.1 L / min) or more is Δt ₀ (for example, 6 minutes), the drain water discharge pump 113 is driven in the next stage. The time ΔT ₁ is given by the following equation.

ΔT ₁ = (ΔT ₀ / Δt ₀ ) × ΔT ₀
In this case, ΔT ₁ is 1.5 minutes. In this way, the driving time of the drain water discharge pump 113 at the next stage can be determined by the following equation.

ΔT _{k + 1} = (ΔT _k / Δt _k ) × ΔT _k (k = 0, 1, 2,...)
・ (1)
Further, even if the water leakage flow rate detection means 111 detects a value less than a predetermined value (for example, 0.1 L / min) and replaces it with a time until it again detects a value less than the predetermined value (for example, 0.1 L / min), (1) It is possible to determine the driving time of the drain water discharge pump 113 based on the equation.

  As described above, in the present embodiment, when the drain water discharge pump 113 is disposed in the drain water channel 105, the control unit 91 uses the signal from the water leakage flow rate detection unit 111 disposed in the acid condensation water channel 102. Then, the operation control when the drain water discharge pump 113 is driven can be performed.

(Embodiment 2)
FIG. 2 is a structural diagram of a hot water supply apparatus according to the third and seventh embodiments of the present invention. A difference from the structure of the hot water supply apparatus of FIG. 1 described in the above (Embodiment 1) of FIG. 2 is that a branch portion from the hot water supply circulation circuit 2 of the hot water outlet 3 is connected to the heat exchanger 52 for heating and the heat exchange for the bath. It is the place arrange | positioned in the upstream of the utilization side heat exchanger of the condenser 80, and the place which has arrange | positioned the water leak flow rate detection means 111 in the drain water channel 105.

  About the hot water supply apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. Note that the basic configuration of the apparatus and the basic operations of the apparatus such as the hot water supply operation, the heating operation, and the bath reheating operation are as described in the above (Embodiment 1) and are omitted.

  When the hot water supply circuit is used alone by arranging the branch portion of the hot water supply path 3 from the hot water supply circulation circuit 2 on the upstream side of the use side heat exchanger, the hot water supply path 3 is 1 of the use side heat exchanger. Without passing through the secondary circuit, it is possible to obtain high-temperature water immediately after leaving the hot water supply heat exchanger 33, so that the flow pressure loss can be reduced and desired hot water can be supplied to the hot water tap 13 quickly. it can.

  Next, by arranging the leakage water flow rate detecting means 111 in the drain water channel 105, the control means 91 can detect water leakage in the drain water channel 105 when leakage occurs in the latent heat recovery heat exchanger 34. At this time, the control unit 91 detects water leakage by the method of <Condition 1-1> to <Condition 1-5> described in the above (Embodiment 1), warns the external notification unit of the occurrence of water leakage, and finally The operation of the apparatus can be stopped.

  Further, when the drain water discharge pump 113 is disposed in the drain water channel 105, the control unit 91 is neutralized by the neutralization tank 104, and the amount of drain water to be actually discharged out of the apparatus is detected as the leakage flow rate detection unit 111 of the drain water channel 105. The drain water discharge pump 113 can be driven more reliably than the configuration in which the water leakage flow rate detection means 111 shown in FIG. As a method for driving the drain water discharge pump 113, for example, the method described in the above (Embodiment 1) can be applied.

  As described above, in the present embodiment, the branch portion from the hot water supply circulation circuit 2 of the hot water supply passage 3 is arranged on the upstream side of the use side heat exchanger, so that it is more than in the case of the above (Embodiment 1). When the hot water supply circuit is used alone, the desired hot water can be immediately supplied to the hot water tap 13. Further, when the drain water discharge pump 113 is arranged in the drain water channel 105 by disposing the water leakage flow rate detecting means 111 in the drain water channel 105, it should be discharged out of the apparatus than in the case of the above (Embodiment 1). Drain water can be reliably detected by the drain water channel 105, and as a result, reliable driving of the drain water discharge pump 113 can be realized.

(Embodiment 3)
FIG. 3 shows a hot water supply apparatus according to the eighth, ninth, tenth, thirteenth, fourteenth, sixteenth, seventeenth, eighteenth, twentieth, twenty-first, twenty-second, twenty-fourth, and twenty-fourth embodiments of the present invention. FIG. 3 is different from the structure of the hot water supply apparatus of FIG. 1 described in (Embodiment 1) of FIG. 3 from the water leakage level electrode 112, the water leakage discharge hole 115, and the water leakage discharge hole 115 in the neutralization tank 104. A subsequent water leakage discharge path 114 is provided. FIG. 4 shows the neutralization tank 104 in FIG. 3 in more detail.

  About the hot water supply apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. Further, another figure is also referred to as appropriate according to the description. Note that the basic configuration of the apparatus and the basic operations of the apparatus such as the hot water supply operation, the heating operation, and the bath reheating operation are as described in the above (Embodiment 1) and are omitted.

  The present embodiment is characterized in that the water leakage discharge hole 115 and the water leakage level electrode 112 are arranged in the neutralization tank 104 as the water leakage detection means. These configurations, the water leakage detection method, and the water leakage level A method of using the electrode 112 for controlling the operation of the drain water discharge pump 113 and a method of using the leakage water level electrode 112 for the function of an electrode for detecting the ph concentration of contact water will be described.

  First, a configuration in which the leakage discharge hole 115 and the leakage water level electrode 112 are arranged in the neutralization tank 104 and various operation control methods will be described as the leakage detection means.

  FIG. 4 shows that when water leaks in the water pipe portion of the latent heat recovery heat exchanger 34 in FIG. 3, the steady water leak is recovered by the receiving tray 101 and enters the neutralization tank 104 through the acidic dew condensation water channel 102 and is partitioned. The state overflows from the plate B117 and is balanced at a certain leaked water surface stable position. The neutralization tank 104 is roughly divided into two rooms by a partition plate B117. The left chamber from the partition plate B117 is filled with a neutralizing agent 103 such as calcium carbonate, and the right chamber is burned by the burner 26. The drain water after the acid condensed water generated therein is neutralized and the steady water leakage when water leakage occurs in the water pipe part of the latent heat recovery heat exchanger 34 as shown in FIG. 4 is temporarily stored. It is done. The room on the left side of the partition plate B117 is further divided into two rooms by the partition plate A116, and acid condensed water and water leakage first enter the room on the left side of the partition plate A116 and pass through the lower passage of the partition plate A116. Enter the room on the right side. In the case of acidic dew condensation water, it is neutralized by the neutralizing agent 103 while passing through the left chamber of the partition plate B117, and becomes, for example, drain water of about ph 7.0 when it overflows from the partition plate B117.

  When a constant water leakage flow rate (for example, 0.1 L / min) is generated from the latent heat recovery heat exchanger 34, the wall thickness t of the neutralization tank 104 and the cross-sectional area condition of the water leakage discharge hole 115 are obtained. Depending on the shape and conditions, as shown in FIG. 4, there is a water leakage stabilization head that has a water leakage flow rate (for example, 0.1 L / min) overflowing from the partition plate B117 and a water leakage flow rate (for example, 0.1 L / min) overflowing from the water leakage discharge passage 114. It should balance with the difference h. At this time, if the leakage water level electrode position z of the leakage water level electrode 112 satisfies the condition of z <h, the leakage water level electrode 112 detects this certain leakage water flow rate (for example, 0.1 L / min). be able to. Here, the ground electrode 118 provided in the neutralization tank 104 is grounded, for example, to the apparatus casing portion, and if there is drain water or leak water contact water between the leak water level electrode 112 connected to the control means 91, electric Conduction occurs, and the control means 91 can recognize that contact water exists between the ground electrode 118 and the leaked water level electrode.

By increasing the wall thickness t of the neutralization tank 104, reducing the cross-sectional area of the leak water discharge hole 115 part, or making the shape difficult to flow of water, the flow path resistance of the leak water discharge hole 115 part increases. Even if the water leakage flow rate is the same (for example, 0.1 L / min), the water leakage stability head difference h increases as the flow path resistance increases. Conversely, by reducing the wall thickness t of the neutralization tank 104, increasing the cross-sectional area of the water leakage discharge hole 115 portion, or making the shape easy to flow water, the flow resistance of the water leakage discharge hole 115 portion is reduced. Even if the water leakage flow rate is the same (for example, 0.1 L / min), the water leakage stability head difference h is reduced as the flow path resistance is reduced. That is, by selecting an appropriate value for the thickness of the neutralization tank 104 and the representative dimension of the leakage discharge hole 115 having an arbitrary cross-sectional shape, and appropriately selecting the arrangement position of the leakage water level electrode 112 with respect to the leakage discharge hole 115, It is possible to determine the water leakage flow rate to be detected. For example, if it is desired to reduce the leakage flow rate desired to be detected with respect to the channel resistance of the same leakage discharge hole 115, the electrode height z may be reduced. If the leakage flow rate desired to be detected is desired to be increased, the electrode height may be increased. What is necessary is just to enlarge z.

  The above is the mechanism of water leakage detection by the water leakage discharge hole 115 and the water leakage level electrode 112 provided in the neutralization tank 104 as the water leakage detection means. Accordingly, by selecting an appropriate value for the thickness of the neutralization tank 104 and the representative dimension of the leakage discharge hole 115 having an arbitrary cross-sectional shape, and appropriately selecting the height z of the leakage water level electrode 112, heat exchange for latent heat recovery is performed. Water leakage from the vessel 34 can be detected. Moreover, it has the advantage that it can respond flexibly to the leaking water flow volume to detect by combining these various conditions appropriately. In addition, about the water leak detection method, the water leak generation | occurrence | production warning to an external alerting | reporting means, and the method of a final apparatus operation stop, for example, <condition 1-1>-<condition 1- described in the above (Embodiment 1) 5>, the function of the water leakage flow rate detection means 111 is replaced with the function of water leakage detection provided by the water leakage discharge hole 115 and the water leakage level electrode 112 provided in the neutralization tank 104 in the present embodiment.

  Next, the configuration of the water leakage discharge hole 115 and the configuration of the neutralization tank 104 including the water leakage discharge passage 114 will be specifically described below with reference to the drawings.

  In FIG. 5, the difference from the configuration of the neutralization tank 104 shown in FIG. 3 and FIG. 4 is a configuration in which the water leakage discharge passage 114 is connected to the drain water passage 115 and the water leakage is discharged out of the apparatus through the drain water passage 115. By the way. Accordingly, the configuration in which the water leakage discharge path 114 and the drain water path 105 in FIGS. 3 and 4 are separately arranged can be simplified.

  6 is different from the configuration of the neutralization tank 104 shown in FIG. 4 in that the leak water discharge hole 115 and the drain water discharge hole 106 for discharging the drain water to the drain water channel 105 are the same pipe. It is formed with a sum tank drain pipe 107, and the neutral tank tank drain pipe 107 is connected to the drain water channel 105 as it is. In FIG. 6, as in FIG. 4, when water leakage occurs in the water pipe portion of the latent heat recovery type heat exchanger 34, steady water leakage is recovered in the tray 101 and enters the neutralization tank 104 through the acidic dew condensation channel 102. , Overflowing from the partition plate B117, showing a state of being balanced at a certain water leakage surface stable position. This leakage of water is drained from the outer surface side of the neutralization tank drain pipe 107 to the inner surface side of the neutralization tank drain pipe 107 through the leak discharge hole 115. In FIG. 6, as in the case described above, the wall thickness t of the drain pipe 107 in the neutralization tank, the representative dimensions of the leak discharge hole 115 having an arbitrary cross-sectional shape, and the electrode height z of the leak level electrode 112 By setting to an appropriate value, it is possible to determine the water leakage flow rate to be detected. Thus, the configuration of the drain pipe 107 in the neutralization tank and the leakage water level electrode 112 can detect leakage in the latent heat recovery heat exchanger 34, and the drain to the outside of the apparatus is connected to the drain water channel 115. Therefore, the device configuration can be simplified.

  FIG. 7A three-dimensionally shows a specific configuration example of the neutralization tank drain pipe 107 in FIG. Although FIG. 7A shows a case where the drain pipe 107 in the neutralization tank has a cylindrical shape, the shape is not limited to this shape, and any tube shape such as a prismatic shape or a hexagonal column shape is considered to be no problem. . In FIG. 7A, the drain water discharge hole 106 and the water leak discharge hole 115 are provided in the side surface portion of the drain pipe 107 in the neutralization tank, and both are circular holes.

  FIG. 7B is an example of the shape of the drain pipe 107 in the neutralization tank, similarly to FIG. 7 (B) is different from the configuration of FIG. 7 (A) in that the drain water discharge hole 106 is configured with the upper surface of the neutralization tank drain pipe 107 opened. With this configuration, when the neutralization tank drain pipe 107 is manufactured by, for example, resin molding, there is an advantage that the mold configuration can be simplified as compared with the case of FIG.

  FIG. 7C is also an example of the shape of the drain pipe 107 in the neutralization tank, similarly to FIGS. 7A and 7B. 7C is different from the configuration of FIG. 7B in that the water leakage discharge hole 115 is formed in a slit shape, and the slit end surface is connected to the drain water discharge hole 106. With this configuration, when the neutralization tank drain pipe 107 is manufactured, for example, by resin molding, in the case of FIG. 7B, it is necessary to post-process the leak discharge hole 115 after one resin molding. In the case of FIG. 7C, there is an advantage that the drain water discharge hole 106 and the slit-shaped water leakage discharge hole 115 can be processed by a single resin molding without post-processing. Note that the slit-shaped water leakage discharge hole 115 can be set to an arbitrary flow path resistance by appropriately selecting the slit width w and the tube wall thickness t of the drain pipe 107 in the neutralization tank.

  8A is different from the configuration of the neutralization tank 104 shown in FIG. 4 in that a partition plate C119 is provided and a room on the right side of the partition plate B is divided into two, and the partition plate C119. The drain water discharge hole 106 and the water leakage discharge hole 115 are arranged on the upper side, and the drainage of the drain water discharge hole 106 and the water leakage discharge hole 115 is unified into the room on the right side of the partition plate C119 and discharged outside the apparatus. A drain water channel 105 is disposed. In FIG. 8A, as in FIG. 4, when water leakage occurs in the water pipe portion of the latent heat recovery type heat exchanger 34, steady water leakage is recovered by the receiving tray 101 and passes through the acidic dew condensation water channel 102. 104 is shown, overflowing from the partition plate B117, and being balanced at a certain water leakage surface stable position. By selecting an appropriate value for the wall thickness t of the partition plate C119 and the representative dimension of the leakage discharge hole 115 having an arbitrary cross-sectional shape, and appropriately selecting the electrode height z of the leakage water level electrode 112, the leakage flow rate to be detected. Can be arbitrarily determined. In this way, in the configuration shown in FIG. 8A, leakage in the latent heat recovery heat exchanger 34 can be detected, and drainage from the drain water discharge hole 106 and the water leakage discharge hole 115 can be performed through one drain water channel 105. It can be discharged outside.

  FIG. 8B shows another example of the shape of the partition plate C119 in FIG. The difference from the shape of the partition plate C119 shown in FIG. 8A in FIG. 8B is the function of the drain water discharge hole 106 by reducing the shape of the partition plate C119 in the height direction (dotted line). The enclosed portion) and three types of water leakage holes 115A, 115B, and 115C having different shapes are arranged at the same height. Here, 115A and 115B of different sizes having a circular cross section and an elliptical 115C are arranged so that their centers are located at the same height. Thus, the partition plate C119 can be easily configured by reducing the shape of the partition plate 119 in the height direction and also serving as the drain water discharge hole 106. In addition, by arranging a plurality of leak discharge holes 115A to 115C having different cross-sectional shapes and areas at the same height, it is possible to arbitrarily adjust the size of the leak flow rate with respect to the same leak stability head difference h. You can have it.

  FIG. 8C shows another example of the shape of the partition plate C119 in FIG. FIG. 8C differs from FIG. 8B in that the water leakage holes 115A, 115B, and 115C are arranged at different heights. As a result, the magnitude of the water leakage flow rate with respect to the same water leakage stabilization head difference h can be arbitrarily adjusted, so that the water leakage detection can be widened.

FIG. 8D shows another example of the shape of the partition plate C119 in FIG. 8 (D) is different from FIG. 8 (B) and FIG. 8 (C) in that the water leakage holes 115A, 115B, and 115C are arranged in combination at the same height and different heights. As a result, the magnitude of the water leakage flow rate with respect to the same water leakage stabilization head difference h can be arbitrarily adjusted, so that the water leakage detection can be widened.

  9A is different from the configuration of the partition plate C119 of the neutralization tank 104 shown in FIG. 8A in that the water leakage discharge hole 115 is a slit having a width w and a height y. Since the circular shape shown in FIG. 8 (A) and the slit shape shown in FIG. 9 (A) are both easy to process as the water leakage discharge hole 115, there is an advantage that it can be easily manufactured. FIGS. 9B, 9C, and 9D correspond to FIGS. 8B, 8C, and 8D, respectively, and show a slit-shaped water leak. By arranging the discharge holes 115A, 115B, and 115C in the same height, different heights, and combinations of the same height and different heights, it is possible to arbitrarily adjust the magnitude of the water leak flow rate for the same water leak stability head difference h. The detection can be widened.

  8B, 8C, 8D, 9B, 9C, and 9D, the partition plate C119 of the neutralization tank 104 is used. The plurality of leakage discharge holes 115A, 115B, and 115C are shown. The plurality of leakage discharge holes are arranged on the outer wall of the neutralization tank 104 in FIG. 4 or FIG. ), FIG. 7 (B), or FIG. 7 (C), even if it is arranged in the drain pipe 107 in the neutralization tank, the magnitude of the water leakage flow rate with respect to the same water leakage stabilization head difference h can be arbitrarily adjusted. The effect which can give width is the same.

  5, FIG. 6, FIG. 7 (A), FIG. 7 (B), FIG. 7 (C), FIG. 8 (A), FIG. 8 (B), FIG. 8 (C), FIG. (A), FIG. 9 (B), FIG. 9 (C), or FIG. 9 (D) is used to describe the case where the water leakage discharge hole 115 and the drain water discharge hole 106 exist separately. On the other hand, it is possible to detect water leakage by providing the single water discharge hole 130 and the water leakage level electrode 112 having both functions of the water leakage discharge hole 115 and the drain water discharge hole 106.

  In FIG. 11A, the difference from the configuration of the neutralization tank 104 shown in FIG. 5 is that a single discharge hole 130 having both functions of the water leakage discharge hole 115 and the drain water discharge hole 106 is provided. The leaked water level electrode 112 is disposed at the leaked water level electrode position having a predetermined positional relationship with respect to the discharge hole position. FIG. 11A shows a state where steady water leakage occurs. The shape of the discharge hole 130 may be an arbitrary cross-sectional shape as in the case of the description of the shape of the water leakage discharge hole 115 described above. In FIG. 11A, when the cross-sectional shape of the single discharge hole 130 is particularly circular, and the center of the circular shape is the discharge hole position, the leakage water level electrode position that is the tip of the leakage water level electrode 112 is the discharge hole position. The state arrange | positioned in the position which is a little lower than this is shown. Since the discharge hole 130 also has a function of discharging drain water to the drain water channel, the drain hole 130 needs to be large enough to drain water. On the other hand, since there is a small amount of water leakage from the latent heat recovery heat exchanger 34 to be detected, in the configuration of FIG. 11A, the water leakage level electrode position is located above the discharge hole position. If so, the resolution of the leaked water flow rate that can be detected cannot be increased.

In FIG. 11 (B), the difference from the configuration of the neutralization tank 104 shown in FIG. 6, FIG. 7 (A), FIG. 7 (B), or FIG. A single water discharge hole 130 having both functions of the water discharge hole 115 is provided in the neutralization tank drain pipe 107, and the water leakage electrode 112 has a predetermined positional relationship with the water discharge hole position. It has just been placed at the water level electrode position. Further, FIG. 11B shows only the portion of the drain pipe 107 in the neutralization tank and the portion where the leakage water level electrode 112 is arranged. Note that the configuration of the arrangement of the discharge holes 130 in FIG. 11B shows an example, and the drain water discharge hole 106 in FIG. 7B is a single discharge hole 130. In FIG. 11 (B), when the top end position of the drain pipe 107 in the neutralization tank is the discharge hole position, the leaked water level electrode position is arranged at a position slightly above the discharge hole position. Since the steady water leakage generated from the latent heat recovery heat exchanger 34 is small, if the leakage water level electrode position is positioned too high with respect to the discharge hole position, the resolution of the detectable leakage water flow rate can be improved. Can not.

  As described above, the thickness t of the water leakage discharge hole 115, the shape and number of the water leakage discharge holes 115, and the installation position are appropriately selected, and the detection height is appropriately combined with the arrangement height of the water leakage level electrode 112. It becomes possible to adjust the water leakage flow rate from the 34 parts of the latent heat recovery heat exchanger.

  Next, when the drain water discharge pump 113 is arranged in the drain water channel 105, for example, in the configuration shown in FIG. 5, the leakage water level electrode 112 has a switch function for driving the drain water discharge pump 113, and the drain water A case where operation control of the discharge pump 113 is performed will be described. In FIG. 5, acidic condensed water is generated in the latent heat recovery type heat exchanger 34 during combustion of the burner 26, and the acidic condensed water recovered by the tray 101 is guided to the neutralization tank 104 through the acidic condensed water channel 102. The water is neutralized by the neutralizing agent 103 and overflows as drain water from the partition plate B 117, passes through the drain water discharge hole 106 and the leak water discharge hole 115, and is forcibly discharged from the drain water channel 105 by the drain water drain pump 113. It shows the state that is.

  When the leakage water level electrode 112 is turned on during combustion of the burner 26, the control means 91 can detect that acidic condensed water has been generated in the latent heat recovery heat exchanger 34. At this time, the control means 91 can perform operation control to turn on the drain water discharge pump 113 for a predetermined time (for example, 3 minutes) from the time when it is detected that the leakage water level electrode 112 is turned on.

  Further, the control means 91 turns on the drain water discharge pump 113 from the time when it is detected that the leak water level electrode 112 is turned on, and after a predetermined time (for example, 1 minute) after the leak water level electrode 112 is turned off, the drain water discharge pump 113. It is possible to perform an operation control to turn off.

  Further, it is possible to consider operation control for determining the drive time of the drain water discharge pump 113 based on the time from when the water leakage level electrode 112 is turned on to the time when it is turned on again, or the time from when it is turned off to when it is turned off again. The amount of acid condensed water generated during combustion of the burner 26 changes every time depending on various conditions such as weather conditions such as temperature and humidity, incoming water temperature conditions, combustion load conditions, etc. It is considered preferable to determine the driving time of the water discharge pump 113.

For example, after the leakage water level electrode 112 is first turned ON (or OFF) from the start of combustion of the burner 26, the time for which the drain water discharge pump 113 is driven initially is a predetermined time ΔT ₀ (for example, 3 minutes (or 1 minute)). And At this time, if the time until the leakage water level electrode 112 is turned on (or turned off) again is Δt ₀ (for example, 6 minutes (or, for example, 2 minutes)), the driving time ΔT of the drain water drain pump 113 in the next stage ₁ is given by the following equation.

ΔT ₁ = (ΔT ₀ / Δt ₀ ) × ΔT ₀
In this case, ΔT ₁ is 1.5 minutes (or 0.5 minutes). In this way, the driving time of the drain water discharge pump 113 at the next stage can be determined by the following equation.

ΔT _{k + 1} = (ΔT _k / Δt _k ) × ΔT _k (k = 0, 1, 2,...) (2)
As described above, when the drain water discharge pump 113 is arranged in the drain water channel 105, the leakage water level electrode 112 can be used for operation control of the drain water discharge pump 113.

  Further, an operation control method for performing the water leakage detection by combining the driving of the drain water discharge pump 113 is conceivable. For example, it is assumed that the leakage water level electrode 112 is turned on for a predetermined time (for example, 30 minutes) at the timing of detecting leakage when the burner 26 stops combustion. At this time, the control means 91 turns on the drain water discharge pump 113 for a predetermined time (for example, 3 minutes), and forcibly discharges the water leakage in the neutralization tank 104 to the outside of the apparatus. Then, when the leakage water level electrode 112 is turned on again within a predetermined time (for example, 3 hours), the control means 91 determines that leakage from the latent heat recovery heat exchanger 34 is occurring. Conversely, if the leakage water level electrode 112 does not turn on again within a predetermined time (for example, 3 hours), the control means 91 determines that water leakage from the latent heat recovery heat exchanger 34 has not occurred.

  As described above, when the drain water discharge pump 113 is disposed in the drain water channel 105, the leak detection is performed more reliably by combining the driving operation of the drain water discharge pump 113 with the method of detecting the water leak using the water leak level electrode 112. be able to.

  Finally, a control method for causing the leakage water level electrode 112 to function as an electrode for detecting the ph concentration of contact water and performing various operations based on this function will be described. For example, in FIG. 5, as described above, the ground electrode 118 provided in the neutralization tank 104 is grounded, for example, to the apparatus casing portion, and between the leaked water level electrode 112 connected to the control means 91, When the contact water is present, electrical conduction occurs, and the control means 91 can recognize that the contact water exists between the ground electrode 118 and the leaked water level electrode. Here, if the contact water is drain water or water leakage, it is considered that the current generated when conducting electricity is small because it is almost neutral. However, if the amount of the neutralizing agent 103 in the neutralization tank 104 decreases and the neutralization capacity declines with the passage of time, the acidic dew condensation water generated during combustion of the burner 26 is sufficiently neutralized in the neutralization tank 104. It overflows from the partition plate B117 without being acidic. In this case, since the contact water is acidic, there are a large number of ions that generate charges in the solution, so that the current generated between the ground electrode 118 and the leaked water level electrode 112 becomes large. That is, if the control means 91 monitors the current generated between the ground electrode 118 and the leaked water level electrode 112, the ph concentration of the contact water can be detected. A method for controlling various operations based on the ph concentration of the contact water will be described below.

  First, the ph concentration condition of the water leakage can be added when the water leakage is detected when the water leakage occurs in the latent heat recovery heat exchanger 34 using the water leakage discharge hole 115 and the water leakage level electrode 112. For example, if the current value corresponding to the ph concentration is greater than or equal to a predetermined value (for example, the current value corresponding to ph 6.0) at the time of the water leak detection, it is determined that the water leaks from the latent heat recovery heat exchanger 34. Can do. Thus, by adding the ph concentration condition to the water leakage detection condition, it is possible to detect water leakage more reliably.

  Next, when burning the burner 26, the amount of neutralizing agent 103 is measured by measuring the ph concentration of drain water. If the amount of the neutralizing agent 103 decreases, an external notification such as a remote controller for remote operation is provided. An example of an operation control method that warns the means and eventually stops the operation of the apparatus will be described below.

<Condition 3-1> Monitoring of drain water ph concentration during combustion of burner 26 From the initial state where the apparatus is installed, the control means 91 monitors the drain water ph concentration during combustion of the burner 26. If the amount of the neutralizing agent 103 is sufficient, the acid condensed water can be sufficiently neutralized. Therefore, the ph concentration should be larger than a predetermined value X ₁ (for example, a current value corresponding to ph 6.0), and the control means 91 monitors whether ph concentration of drain water is greater than _{X 1.}

In aging If ph concentration of <Condition 3-2> drain water detects a predetermined value X _1, and neutralizing capacity amount of the neutralizing agent 103 decreases declined, eventually becomes a predetermined value X _1. At this time, the control means 91 warns an external notification means such as a remote controller for remote operation and prompts the user to replenish the neutralizing agent 103.

<Conditions 3-3> After notification described in the case of continued even devices used after the predetermined value X ₁ Detection <Conditions 3-2> Also, if continued as device use without filling of neutralizing agent 103, Further, the amount of the neutralizing agent 103 is reduced and the neutralizing ability is further reduced. Therefore, when a predetermined value X ₂ (for example, a current value corresponding to ph 4.0) is further detected, the control means 91 performs operation control for stopping the operation of the apparatus, and outside the apparatus in a state where the acid condensed water is not neutralized. Prevent from being discharged.

  As described above, the amount of the neutralizing agent 103 in the neutralizing tank 104 is detected by combining the function of the leakage water level electrode 112 with the function of the electrode for detecting the ph concentration of the contact water. In the case of decrease, it is possible to perform an operation control for warning the external notification means and stopping the operation of the apparatus.

(Embodiment 4)
FIGS. 10A, 10B, and 10C are structural views of the neutralization tank 104 in the twenty-fifth embodiment of the present invention. A difference from the structure of the neutralization tank 104 of FIG. 5 described in the above (Embodiment 3) of FIG. 10A is that two leaked water level electrodes 112A and 112B are provided at different heights as a plurality of leaked water level electrodes. it was placed in the z _a and _{z B.} 10A, FIG. 10B, and FIG. 10C show the water leakage surface stable position h with respect to z _A and z _B changed. Moreover, in each figure, although it represents as the leaked water surface h, in the case of the drain water which generate | occur | produces at the time of combustion of the burner 26, suppose that a leaked water surface is replaced with the drain water surface.

  About the hot water supply apparatus which has the neutralization tank 104 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. Note that the basic configuration of the apparatus and the basic operations of the apparatus such as the hot water supply operation, the heating operation, and the bath reheating operation are as described in the above (Embodiment 1) and are omitted.

  In the present embodiment, by disposing two in the neutralization tank 104 as a plurality of water leakage level electrodes, the water leakage flow rate in the latent heat recovery heat exchanger 34 can be detected in more detail, and the drain water channel When the drain water discharge pump 113 is provided at 105, it can be used for driving control of the drain water discharge pump 113.

First, a method for detecting the leakage flow rate generated in the 34 parts of the latent heat recovery heat exchanger will be described. 10 (A), 10 (B), and 10 (C), the leakage water level electrode A112A is provided for the flow path resistance in which the neutralization tank thickness t and the shape of the leakage discharge hole 115 are selected to be a certain value. some predetermined leakage flow rate _q a L / min _(e.g., q a = 0.05L / min) can detect the electrodes to the height _{z a,} a predetermined leakage flow rate is leakage water level electrode B112B _q B L / min (e.g., q _B = 0.15 L / min) is assumed to be arranged at an electrode height z _B that can be detected. At this time, the leakage flow rate can be determined as follows with respect to the ON / OFF state of each leakage water level electrode.

When h> zB (leakage water level electrode A 112A, leak water level electrode _B 112B) = (ON, ON)
(Leakage flow rate q): q _B L / min or more (for example, 0.15 L / min or more)
For z _A <h <z _B (water leakage water level electrode A 112a, leakage water level electrode B112B) = (ON, OFF)
(Leakage flow _q): The following q A L / min or more _q B L / min
(For example, 0.05 L / min or more and 0.15 L / min or less)
In the case of h <z _A (leakage water level electrode A 112A, leak water level electrode B 112B) = (OFF, OFF)
(Water leakage flow rate q): Water leakage cannot be detected As described above, by arranging a plurality of water leakage level electrodes in the neutralization tank 104 at different heights, the more detailed latent heat recovery heat exchanger 34 parts Leakage flow rate can be detected.

  Next, when the drain water discharge pump 113 is arranged in the drain water channel 105, operation control in the case where the drain water discharge pump 113 is driven in correspondence with the ON / OFF states of a plurality of leaked water level electrodes will be described.

  In each of FIGS. 10A, 10B, and 10C, when the water leakage surface is replaced with the drain water surface, for example, the following operation control of the drain water discharge pump 113 can be performed. .

When the drain water discharge pump 113 is turned on The drain water discharge pump 113 is OFF, and the water leakage level electrode B 112B is turned ON from the state of (water leakage level electrode A 112A, water leakage level electrode B 112B) = (ON, OFF). In this case, the drain water discharge pump 113 is turned on after a predetermined time (for example, 3 minutes) from the time of turning on.

When turning off the drain water discharge pump 113 The drain water discharge pump 113 is ON, and the water leak level electrode A 112A is turned OFF from the state of (leak water level electrode A 112A, water leak level electrode B 112B) = (ON, OFF). In this case, the drain water discharge pump 113 is turned OFF after a predetermined time (for example, 1 minute) from the OFF point.

  As described above, when the drive of the drain water discharge pump 113 is controlled using a plurality of water leakage level electrodes, the neutralization tank is more than the case described in the above (Embodiment 1) and (Embodiment 3). Depending on the presence or absence of drain water in 104, the drain water discharge pump 113 can be driven reliably.

  As described above, the hot water supply apparatus according to the present invention has a hot water supply and heating system, a hot water supply and a bath, or a hot water supply and a heating and a bath as a single heat source. Since it is possible to reduce the weight, the installation space is secured, the workability is improved, and the latent heat recovery heat exchanger is provided, so it is possible to achieve high efficiency and save energy by reducing running costs. It can also be applied to uses such as petroleum hot water bath equipment and hot water heaters.

Structure diagram of hot water supply apparatus in Embodiment 1 of the present invention Structure diagram of hot water supply apparatus in Embodiment 2 of the present invention Structure diagram of hot water supply apparatus in Embodiment 3 of the present invention Structural diagram of neutralization tank in Embodiment 3 of the present invention Structural diagram of neutralization tank in Embodiment 3 of the present invention Structural diagram of neutralization tank in Embodiment 3 of the present invention (A) Structural diagram of drain pipe in neutralization tank in Embodiment 3 of the present invention (B) Structural diagram of drain pipe in neutralization tank in Embodiment 3 of the present invention (C) Embodiment 3 of the present invention Of the structure of the drain pipe in the neutralization tank (A) Structural diagram of neutralization tank in embodiment 3 of the present invention (B) Structural diagram of partition plate C in embodiment 3 of the present invention (C) Structure of partition plate C in embodiment 3 of the present invention FIG. (D) Structural diagram of partition plate C in Embodiment 3 of the invention (A) Structural diagram of neutralization tank in embodiment 3 of the present invention (B) Structural diagram of partition plate C in embodiment 3 of the present invention (C) Structure of partition plate C in embodiment 3 of the present invention Fig. (D) Structure of partition plate C in Embodiment 3 of the present invention (A) Structure diagram of neutralization tank in embodiment 4 of the present invention (B) Structure diagram of partition plate C in embodiment 4 of the present invention (C) Structure of partition plate C in embodiment 4 of the present invention Figure (A) Structural diagram of neutralization tank in embodiment 3 of the present invention (B) Structural diagram of drain pipe in neutralization tank in embodiment 3 of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water supply path 2 Hot-water supply circulation circuit 3 Hot-water supply path 7 Circulation pump 26 Burner 33 Hot-water supply heat exchanger 34 Latent heat recovery heat exchanger 91 Control means 101 Receptacle 102 Acidic condensation water path 103 Neutralizer 104 Neutralization tank 105 Drain water path 106 Drain Water discharge hole 111 Water leakage flow rate detection means 112 Water leakage level electrode 113 Drain water discharge pump 115 Water leakage discharge hole 130 Water discharge hole

Claims (16)

A hot water supply heat exchanger that heats the water supplied from the water supply channel by combustion of the burner and supplies hot water to the hot water supply channel;
A latent heat recovery heat exchanger that is disposed in the combustion exhaust gas path of the burner and recovers the latent heat of the combustion exhaust gas ;
Connect the latent heat recovery heat exchanger and the heat exchanger for the hot water supply in series, the hot water circulation throughout the use-side heat exchanger via the through circulation pump hot water supply heat exchanger from the latent heat recovery heat exchanger to form a circuit, said branched from the hot water supply circulation circuit to form a water supply circuit leading to the tapping line, the hot water supply circulation circuit and whether to use either one of the hot water supply circuit, or a hot water circulation circuit and the hot water supply circuit at the same time A hot water supply circuit configured to select whether to use, or
A tray for collecting the acidic dew condensation water generated in the latent heat recovery heat exchanger, an acidic dew channel for guiding the acid dew condensation water to the neutralization tank, a neutralization tank having a neutralizing agent therein, and the neutralization tank A neutralization circuit for neutralizing acidic condensed water generated in the latent heat recovery heat exchanger , comprising a drain water channel for discharging the neutralized drain water out of the apparatus ;
Provided in the neutralization tank section, a water leakage discharge hole having an arbitrary cross-sectional shape balances the amount of water leakage from the hot water supply side circuit and the amount discharged from the water leakage discharge hole when water leakage occurs from the hot water supply side circuit. A water leakage detection means for detecting a water leakage flow rate from the hot water supply side circuit , and
In the water level rise in the neutralization tank, and a control means for detecting water leakage from the hot water supply side circuit in the latent heat recovery heat exchanger unit,
With
A plurality of the water leakage discharge holes having an arbitrary cross-sectional shape are provided, and each of the water leakage discharge hole representative positions is arranged in the neutralization tank unit at the same height, or is arranged in the neutralization tank unit at a different height. The hot water supply apparatus which is a structure which is a structure or the structure arrange | positioned in the neutralization tank part combining the same height and different height . If provided plurality as the utilization side heat exchanger, connected to each of said use side heat exchanger in parallel to the hot water supply circulation circuit, so that the hot water temperature supplied is substantially the same from the hot water supply heat exchanger The hot water supply apparatus according to claim 1. The branch portion from the hot water supply circulation circuit of tapping path, water heater disposed claims 1 or 2 wherein the upstream side of the use side heat exchanger. The branch portion from the hot water supply circulation circuit of tapping path, said use side heat exchanger water heater according to claim 1 or 2, wherein at the downstream side of the. Configuration and claims 1 water heater according to discharge leakage discharged from the leakage discharge hole to the drain water channel. Wherein a leakage discharge hole, said the drain water is neutralized with a neutralizing tank drain water discharge hole for discharging the drain water channel, claims are formed on the same tube and configured to be guided to the drain water channel Item 6. A water heater according to item 5 . The hot water supply apparatus according to any one of claims 1 to 6 , wherein a cross-sectional shape of the water leakage discharge hole is a circular shape that is simple in processing. The hot water supply apparatus according to any one of claims 1 to 6 , wherein a cross-sectional shape of the water leakage discharge hole is a slit shape that is simple in processing. A hot water supply heat exchanger that heats the water supplied from the water supply channel by combustion of the burner and supplies hot water to the hot water supply channel;
A latent heat recovery heat exchanger that is disposed in the combustion exhaust gas path of the burner and recovers the latent heat of the combustion exhaust gas;
The hot water supply heat exchanger and the latent heat recovery heat exchanger are connected in series, and the hot water circulation from the latent heat recovery heat exchanger through the hot water supply heat exchanger to the use side heat exchanger via the circulation pump Forming a circuit, forming a hot water supply circuit that branches from the hot water supply circulation circuit and leads to a hot water supply path, and uses either the hot water supply circulation circuit or the hot water supply circuit, or simultaneously uses the hot water supply circulation circuit and the hot water supply circuit. A hot water supply circuit configured to select whether to use, or
A tray for collecting the acidic dew condensation water generated in the latent heat recovery heat exchanger, an acidic dew channel for guiding the acid dew condensation water to the neutralization tank, a neutralization tank having a neutralizing agent therein, and the neutralization tank A neutralization circuit for neutralizing acidic condensed water generated in the latent heat recovery heat exchanger, comprising a drain water channel for discharging the neutralized drain water out of the apparatus;
Provided in the neutralization tank section, a water leakage discharge hole having an arbitrary cross-sectional shape balances the amount of water leakage from the hot water supply side circuit and the amount discharged from the water leakage discharge hole when water leakage occurs from the hot water supply side circuit. A water leakage detection means for detecting a water leakage flow rate from the hot water supply side circuit, and
Control means for detecting water leakage from the hot water supply side circuit in the heat exchanger section for latent heat recovery when the water level in the neutralization tank rises, and disposed in the drain water channel for discharging the drain water out of the device Drain water discharge pump ;
With
The leakage water level electrode also serves as a switching function of the drain water discharge pump driving start,
Wherein, when the burner combustion, the starts driving of the drain water discharge pump ON operation of the leakage water level electrode is controlled so as to drive a predetermined time the drain water discharge pump from ON operation of the leakage water level electrode, Hot water supply device. The hot water supply apparatus according to claim 9 , wherein the control means starts driving the drain water discharge pump when the leakage water level electrode is turned ON, and controls the drain water discharge pump to be driven for a predetermined time from the OFF operation of the leakage water level electrode. . It said control means, hot water supply device according to claim 9 or 1 0, wherein determining the driving time of the drain water drainage pump in accordance with the time of OFF from the time or OFF ON from ON of leakage water level electrode. The leakage water level electrode also serves as an electrode for detecting the ph concentration of contact water,
The hot water supply apparatus according to any one of claims 9 to 11, wherein the control means has a function of determining a ph concentration of contact water in accordance with an amount of current flowing through a leakage water level electrode. Wherein, when water leakage There detection from the hot water supply side circuit, in addition to detecting the water level rise in the neutralization tank, ph concentration detected from the leakage water level electrode from the hot water supply side circuit if more than a predetermined value The hot water supply device according to claim 12 , wherein it is determined that there is water leakage. Wherein, when the burner combustion, the if ph concentration of contact water detected by the water leakage water level electrode is equal to or smaller than a predetermined value, neutralizing the amount of neutralizing agent in the neutralization tank is insufficient acidic condensation The hot water supply device according to claim 12 , wherein it is determined that the function to be reduced is in a lowered state. Wherein when it is determined that there is leakage from the hot water supply side circuit, and notification if an external notification means is controlled so as to let the shutdown of the device after a predetermined period of time, water heater according to claim 13 . Wherein when the amount of neutralizing agent in the neutralization tank is determined to be insufficient, and notification if an external notification means is controlled so as to let the shutdown of the device after a predetermined period of time, The hot water supply device according to claim 14 .

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