JP2007120925A - End-stop type gas water heater and gas hot water supply system using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain the water of boiling temperature in a short time with small fuel consumption, and to improve comfort in a kitchen in summer. <P>SOLUTION: A separating plate 3 is mounted in a casing 2 of a water heater main body 1, a heat exchanger 4 for hot water to obtain hot water of a temperature lower than the water of boiling temperature, and a burner 5 for hot water, heating the heat exchanger 4 for hot water are disposed in one of the spaces partitioned by the separating plate 3, and a heat exchanger 6 for water of boiling temperature to obtain the water of boiling temperature or a temperature close to the boiling temperature, and a burner 7 for water of boiling temperature, heating the heat exchanger 6 for water of boiling temperature are disposed in the other space. The heat exchanger 4 for hot water is mounted in piping 9 for hot water, connected with a water supply tube 8, and a hot water supply opening 10 is formed on a tip of the piping 9 for hot water to supply the hot water. The heat exchanger 6 for water of boiling temperature is mounted in piping 11 for water of boiling temperature, connected with an intermediate portion of the piping 9 for hot water, and the boiling hot water supply opening 12 is formed on a tip of the piping 11 for the boiling hot water to supply the water of boiling-temperature. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a first-stop gas water heater configured to be able to supply boiling temperature water at or near boiling temperature and hot water having a temperature lower than boiling temperature water, and a gas hot water system using the same.

When making tea, coffee, tea, or making instant foods such as ramen, yakisoba, soup, and cup noodles, a small amount of hot water is usually boiled in a kettle or a pan. However, there is a problem that it takes time to boil hot water to the boiling state, and it takes time and trouble to obtain such a small amount of hot water, such as a kettle or a pan. There was also a safety problem of emptying for a small amount. In addition, there is a problem that the hot water is wasted because more than the necessary amount of water is boiled and the fuel cost (gas cost and electricity cost) is increased. In addition, since combustion exhaust heat is added to the room, comfort is lowered particularly in summer.
There is an electric pot that heats the hot water so as to avoid the above-mentioned time-consuming problem and stores it at a high temperature. In addition, there is a problem that the hot water is boiled unnecessarily and the electricity bill is further increased for heat insulation. In addition, when going out or sleeping, there is still a safety concern about turning on the power and leaving it alone, and the power is often turned off. However, in this case, there is a problem that hot water cannot be obtained immediately.

Conventionally, boiling water can be obtained from a faucet as follows.
That is, a mixing faucet faucet, a water purifying faucet, and a boiling water faucet are provided at the rear of the sink of the counter portion of the sink.
A branch pipe is branched from the middle of a water supply pipe for supplying tap water, and a water purifier is connected to the branch pipe. A purified water pipe and a boiling water pipe are connected to the outlet of the water purifier, and a boiling water faucet is connected to the boiling water pipe, and a heating device is provided in the middle of the boiling water pipe.

The heating device includes a heat source for using the purified water purified by the water purifier as boiling water, and a heating tank for storing the generated boiling water. In addition, when the boiling water stored in the heating tank reaches a predetermined temperature, the boiling water is automatically reheated by a heat source to maintain the boiling water state. Thereby, boiling water can be supplied from the tap for boiling water, and tea and coffee can be put here (refer patent document 1).
JP 2003-96849 A

However, the above-described publication example has the following drawbacks.
Although boiling water can be taken out from the boiling water faucet at all times and is conveniently configured, the boiling water is stored in a heating tank and automatically reheated to keep the stored boiling water in the boiling water state. In addition, as in the case of a conventional electric kettle, there is a problem that since the hot water more than the necessary amount is always secured, the electricity cost becomes higher due to the heat insulation. In addition, as with the electric pot, safety concerns remain when leaving the heating power on when going out or sleeping. Furthermore, the electric heater has a problem in terms of energy saving because its efficiency in terms of primary energy is as small as about 35% considering the efficiency of the power plant.

  The present invention has been made in view of the above points, and the invention according to claim 1 is capable of obtaining boiling temperature water in a short time and with a low fuel cost, and a summer kitchen. The invention according to claim 2 is to improve the safety by preventing the generation of excessive water vapor by controlling well to a boiling temperature or a temperature close thereto, and The invention according to claim 3 aims to make it possible to further reduce the fuel cost, and the invention according to claim 3 aims to make it possible to supply boiling temperature water safely, and the invention according to claim 4 provides further safety. The purpose is to be able to improve.

In order to achieve the above-described object, the first-stop gas water heater of the invention according to claim 1
A boiling temperature water supply port for supplying boiling temperature water at or near the boiling temperature;
A hot water supply port for supplying hot water at a temperature lower than boiling temperature water;
A heat exchanger for boiling temperature water which is interposed in a piping for boiling temperature water connecting the boiling temperature water supply port and a water supply pipe to obtain boiling temperature water;
A boiling temperature water burner for heating the boiling temperature water heat exchanger;
A hot water heat exchanger which is provided in a hot water pipe connecting the hot water supply port and the water supply pipe to obtain hot water;
A hot water burner for heating the hot water heat exchanger is provided.

(Action / Effect)
According to the configuration of the first-stop type gas water heater of the invention according to claim 1, normal hot water, that is, hot water having a temperature lower than the boiling temperature water is heated by the hot water heat exchanger and the hot water burner, and the hot water supply port The boiling temperature water can be supplied from the boiling temperature water supply port after being heated by a boiling temperature water heat exchanger and a boiling temperature water burner.
Therefore, since boiling temperature water is obtained by heating with a dedicated heat exchanger for boiling temperature water and a boiling temperature water burner, it can be obtained in a short time even when there is a large amount of hot water as well as a small amount.
In addition, since it is not stored in a tank or the like and a gas burner having a remarkably higher thermal efficiency than that of an electric heater is used, and only a necessary amount of boiling temperature water can be obtained when necessary, the fuel cost can be reduced. In addition, unlike an electric heater, there is no need to constantly heat, so it becomes safer.
Moreover, since boiling temperature water is supplied from a dedicated boiling temperature water supply port, it is easy to call attention at the time of hot water supply and is safe. Moreover, since the combustion exhaust heat is not exhausted indoors, the comfort of the kitchen in summer is improved. Moreover, the efficiency in terms of primary energy can be realized as 80% or more, which saves energy.

In order to achieve the above-described object, the invention according to claim 2
The front-end type gas water heater according to claim 1,
An inlet side temperature sensor for measuring the temperature of water supplied to the boiling temperature water heat exchanger;
An outlet-side temperature sensor for measuring the temperature of boiling temperature water taken out from the heat exchanger for boiling temperature water;
Water amount measuring means for measuring the amount of water supplied to the boiling temperature water heat exchanger;
The amount of heat for calculating the amount of heating heat necessary for obtaining boiling temperature water in the heat exchanger for boiling temperature water based on the temperature measured by the inlet temperature sensor and the amount of water measured by the water amount measuring means. A calculation means;
For boiling temperature water so that the heating heat amount calculated by the heat amount calculating means is obtained and the temperature of the boiling temperature water taken out from the heat exchanger for boiling temperature water measured by the outlet side temperature sensor becomes the boiling temperature. And a fuel gas supply amount control means for adjusting the amount of fuel gas supplied to the burner.

(Action / Effect)
According to the configuration of the first stop type gas water heater of the invention according to claim 2, the temperature of the water supplied to the boiling temperature water heat exchanger measured by the inlet side temperature sensor and the water amount measuring means are measured. The amount of heating heat required to obtain boiling temperature water is calculated according to the amount of water supplied to the heat exchanger for boiling temperature water, and the fuel gas supply amount is controlled so that the amount of heat can be obtained, and measured by the outlet side temperature sensor. The fuel gas supply amount is controlled while confirming whether the boiling temperature water is obtained from the temperature of the boiling temperature water taken out from the boiling temperature water heat exchanger.
Because of the first stop type, the water pressure in the water heater is higher than atmospheric pressure, and therefore does not boil at the boiling temperature of 100 ° C. under atmospheric pressure. Therefore, when the heating amount becomes excessive, a temperature higher than 100 ° C. can be detected by the outlet side temperature sensor, and as a result, control at the 100 ° C. level becomes easy. On the other hand, in the case of the non-stop type, even if it is heated excessively, it does not reach 100 ° C. or more, it is difficult to control, and a large amount of water vapor is generated from the faucet.
Therefore, since boiling temperature water can be obtained with the minimum required amount of fuel gas supply, the fuel cost can be further reduced. Moreover, since generation | occurrence | production of excessive water vapor | steam can be prevented, dangers, such as a burn, can be prevented.

In order to achieve the above-described object, the invention according to claim 3
A gas hot water system using the first-stop gas water heater according to claim 1 or 2,
A boiling temperature water supply pipe connected to the boiling temperature water supply port and supplying boiling temperature water to or near the sink;
A boiling temperature water drain pipe connected to the boiling temperature water supply port and drained to a sink or a drain pipe connected thereto;
It comprises switching means for switching between a state in which the boiling temperature water flows to the boiling temperature water supply pipe side and a state to flow to the boiling temperature water drain pipe side.

(Action / Effect)
According to the configuration of the gas hot water system of the invention according to claim 3, when the boiling temperature water is supplied, the switching means switches the state from flowing to the boiling temperature water drain pipe side to the state flowing to the boiling temperature water supply pipe side. As a result, water up to the boiling temperature first can be flowed to the boiling temperature water drain pipe side, and high-temperature water and water vapor during that time do not have to flow to the boiling temperature water supply pipe side. By this, after it becomes boiling temperature water, for example, place a cup of coffee or a cup of noodles under the place where the boiling temperature water is supplied, and switch to the boiling temperature water supply pipe side to supply the boiling temperature water. Boiling temperature water can be supplied safely.
When draining from the boiling temperature water drain pipe to the sink, it is preferable from the viewpoint of safety that the tip of the drain is located at a lower position of the sink. Thereby, scattering of high temperature waste water and water vapor can be prevented. For example, it is 5 cm or less from the bottom of the sink of the sink.
It is preferable in terms of appearance that the boiling temperature drain pipe is connected to the drain pipe of the sink inside the sink.

In order to achieve the above-described object, the invention according to claim 4
In the gas hot-water supply system according to claim 3,
A boiling temperature water supply pipe is provided with a water vapor separator that separates water vapor, a water vapor discharge unit that discharges the separated water vapor to the water vapor separator, and a boiling temperature water that flows down the boiling temperature water from which the water vapor has been separated. Gas hot water supply system that has a supply unit.

(Action / Effect)
According to the configuration of the gas hot water supply system of the invention according to claim 4, even when steam is mixed in boiling temperature water, such as in the initial stage of supply of boiling temperature water, the steam is discharged at the steam discharge section, and the steam is separated. The boiling temperature water can be supplied from the boiling temperature water supply unit.
Therefore, the boiling temperature water can be prevented from splashing due to the mixed steam, and the safety can be further improved.

According to the configuration of the first-stop type gas water heater of the invention according to claim 1, normal hot water, that is, hot water having a temperature lower than the boiling temperature water is heated by the hot water heat exchanger and the hot water burner, and the hot water supply port The boiling temperature water can be supplied from the boiling temperature water supply port after being heated by a boiling temperature water heat exchanger and a boiling temperature water burner.
Therefore, since boiling temperature water is obtained by heating with a dedicated heat exchanger for boiling temperature water and a boiling temperature water burner, it can be obtained in a short time even when there is a large amount of hot water as well as a small amount.
In addition, since it is not stored in a tank or the like and a gas burner having a remarkably higher thermal efficiency than that of an electric heater is used, and only a necessary amount of boiling temperature water can be obtained when necessary, the fuel cost can be reduced. In addition, unlike an electric heater, there is no need to constantly heat, so it becomes safer.
Moreover, since boiling temperature water is supplied from a dedicated boiling temperature water supply port, it is easy to call attention at the time of hot water supply and is safe. Moreover, since the combustion exhaust heat is not exhausted indoors, the comfort of the kitchen in summer is improved. Moreover, the efficiency in terms of primary energy can be realized as 80% or more, which saves energy.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a first embodiment of a first-stop gas water heater according to the present invention, and FIG. 2 is a side view showing a hot-water supply system using the first-stop gas water heater according to the present invention. A separating plate 3 is provided in the casing 2 of the main body 1, and in one space partitioned by the separating plate 3, a hot water heat exchanger 4 for obtaining hot water having a temperature lower than the boiling temperature water, and the hot water heat exchange. A hot water burner 5 for heating the vessel 4, and a boiling temperature water heat exchanger 6 for obtaining boiling temperature water at or near the boiling temperature, and a boiling temperature water heat exchanger 6 in the other space. A boiling temperature water burner 7 for heating is provided. Since the separation plate 3 can prevent the diffusion of the combustion heat of the gas, it is useful in terms of preventing a decrease in thermal efficiency and improving safety.

The hot water heat exchanger 4 is interposed in a hot water pipe 9 connected to a water supply pipe 8, and a hot water supply port 10 is provided at the tip of the hot water pipe 9 so as to supply hot water. .
Further, the boiling temperature water heat exchanger 6 is interposed in a boiling temperature water pipe 11 connected to a halfway portion of the hot water pipe 9, and a boiling temperature water supply port 12 is provided at the tip of the boiling temperature water pipe 11. Is provided and is configured to supply boiling temperature water.
The hot water heat exchanger 4 is also provided in the circulation pipe 13 for reheating the bath, and is configured so that the hot water heat exchanger 4 can also recharge the bath.

In parallel with the hot water heat exchanger 4, a bypass pipe 15 for adjusting the hot water temperature is connected across the water supply pipe 8 and the hot water pipe 9 via a bypass flow rate adjustment valve 14.
The hot water burner 5 is configured to supply fuel gas from a hot water burner gas supply pipe 18 provided with a hot water burner on-off valve 16 and a hot water burner flow rate adjustment valve 17.
The boiling temperature water burner 7 is supplied with fuel gas from a boiling temperature water burner gas supply pipe 21 provided with a boiling temperature water burner on-off valve 19 and a boiling temperature water burner flow control valve 20. It is configured as follows. When there is a request for boiling temperature water, it is preferable to ignite the hot water burner 5 and raise the temperature by the hot water heat exchanger 4 regardless of whether there is a hot water request.

The water supply pipe 8 is provided with a water supply temperature sensor 22 for measuring the temperature of the supplied water and a water supply amount sensor 23 for measuring the water supply amount.
The hot water pipe 9 is provided with a hot water hot water temperature sensor 24 for measuring the temperature of hot water discharged from the hot water heat exchanger 4 and a hot water amount sensor 25 for measuring the amount of hot water taken out from the hot water supply port 10. It has been. Furthermore, a hot water supply temperature sensor 26 that measures the temperature of hot water taken out from the hot water supply port 10 and a hot water excessive flow prevention valve 27 for adjusting the amount of water that flows out from the location where the hot water pipe 9 is connected to the bypass pipe 15. And are provided.
The piping 11 for boiling temperature water is provided with an outlet side temperature sensor 28 for measuring the temperature of boiling temperature water taken out from the heat exchanger for boiling temperature water, and an excessive flow prevention water amount control valve 29 for boiling temperature water. It has been.
As a preferable method for reducing the capacities of the boiling temperature water heat exchanger 6 and the boiling temperature water burner 7, when the boiling temperature water is requested, the hot water heat exchanger 4 is used regardless of whether or not there is a request for hot water. Set the outlet temperature as high as possible. For example, it is effective to provide a function of 60 to 80 ° C. Thereby, the temperature increase range to a boiling temperature can be made small, for example, can be 20-30 degreeC. In this case, the cooling to the required temperature of the hot water can be realized by increasing the flow rate to the bypass pipe 15 by the bypass flow rate control valve 14 and reducing the flow rate to the hot water pipe 9.

  As shown in FIG. 2, a boiling temperature water supply pipe 31 for supplying boiling temperature water to the sink 30 is provided, and the boiling temperature water supply pipe 31 is connected to a boiling temperature via a switching valve 32 and an intermediate pipe 33 as switching means. It is connected to the water supply port 12. A boiling temperature water drain pipe 34 is connected to the switching valve 32, and the boiling temperature water drain pipe 34 is connected to an intermediate position of the drain pipe 35 connected to the sink 30 a of the sink 30.

The switching valve 32 can be switched between a fully closed state and a state of flowing to the boiling temperature water supply pipe 31 side with the state of flowing to the boiling temperature water drain pipe 34 side, and the boiling temperature water supply pipe 31 side. It is composed of a three-way valve whose flow rate can be adjusted while flowing through
A thermometer 36 is provided on the upstream side of the switching valve 32 of the intermediate pipe 33, and it is confirmed by the thermometer 36 that the boiling temperature (temperature of 100 ° C.) has been reached, and then flows to the boiling temperature water drain pipe 34 side. It is comprised so that it can switch to the state which flows into the boiling temperature water supply piping 31 side from a state.

  As shown in the front view of the main part of the hot water supply system in FIG. 3, the boiling temperature water supply pipe 31 is provided with a water vapor separator 37 for separating water vapor, and the water vapor separator 37 discharges the separated water vapor. And a boiling temperature water supply unit 37b for supplying the boiling temperature water from which the water vapor has been separated. Thereby, it is possible to prevent the water vapor mixed in the boiling temperature water from scattering from the boiling temperature water supply pipe 31.

A water supply amount sensor 23, a hot water amount sensor 25, a hot water tapping temperature sensor 24, and an outlet side temperature sensor 28 are connected to a controller 38, and a boiling temperature water burner flow rate adjustment valve 20 and an alarm device 39 are connected to the controller 38. ing.
As shown in the block diagram of FIG. 4, the controller 38 includes a boiling temperature water amount measuring means 40, a heat amount calculating means 41, a comparing means 42, and a fuel gas supply amount control means 43.

The water amount measuring means 40 calculates the amount of hot water supplied to the boiling temperature water heat exchanger 6 by subtracting the amount of hot water supplied measured by the hot water amount sensor 25 from the amount of water supplied measured by the water supply amount sensor 23. It has become.
In the calorie calculation means 41, the boiling temperature water based on the amount of hot water measured by the water quantity measuring means 40 and the temperature of the hot water supplied to the boiling temperature water heat exchanger 6 measured by the hot water tapping temperature sensor 24. The amount of heating heat necessary to obtain boiling temperature water in the heat exchanger 6 is calculated.

  The comparison means 42 compares the temperature of boiling temperature water taken out from the heat exchanger 6 for boiling temperature water measured by the outlet side temperature sensor 28 with 100 ° C. which is the boiling temperature, and compares it when it reaches 100 ° C. The output is output to the alarm device 39, the alarm device 39 is operated, an alarm sound such as “beep” is generated to notify that the boiling temperature water is obtained, and the comparison output is supplied to the fuel gas supply amount control means 43. To come out. The alarm device 39 can be omitted.

  The fuel gas supply amount control means 43 obtains the valve opening required to obtain the heat quantity calculated by the heat quantity calculation means 41, and supplies the boiling temperature water burner flow rate control valve 20 so as to obtain the valve opening degree. A control output is output to adjust the opening. Further, in response to the comparison output from the comparison means 42, the opening degree at that time is maintained in preference to the control output from the fuel gas supply amount control means 43. Thereby, it can be confirmed by the outlet side temperature sensor 28 that boiling temperature water is obtained.

  Although not shown in the figure, the controller 38 ignites the hot water burner 5 due to the water supply request by the hot water amount sensor 25, and the boiling temperature water burner 7 due to the boiling temperature water request due to the flow rate difference between the water supply amount sensor 23 and the hot water amount sensor 25. In addition to the ignition, etc., an operation performed in a normal leading gas heater is automatically performed.

  According to the configuration of the first embodiment, when boiling water is supplied in the state of using hot water, boiling water is heated by the heat exchanger 6 for boiling temperature water in order to heat the hot water heated by the heat exchanger 4 for boiling water. There is an advantage that temperature water can be obtained in a shorter time. Moreover, there exists an advantage which can reduce the magnitude | size of the heat exchanger 6 for boiling temperature water.

FIG. 5 is a configuration diagram showing a second embodiment of the first-stop gas water heater according to the present invention, and the differences from the first embodiment are as follows.
That is, the boiling temperature water pipe 11 is branched from the upstream side of the hot water heat exchanger 4 of the water supply pipe 8, and the boiling temperature water heat exchanger 6 is interposed in the boiling temperature water pipe 11. At the same time, a water quantity sensor 51 as a water quantity measuring means is attached upstream of the boiling temperature water heat exchanger 6. Other configurations are the same as those of the first embodiment, and the description is omitted by giving the same reference numerals.

  In the second embodiment, when controlling the flow rate control valve 20 for the boiling temperature water burner, the water amount measuring means 40 of the first embodiment is unnecessary, and the water amount measured by the water amount sensor 51 is input to the heat amount calculating means. good. Moreover, it replaces with the temperature sensor 24 for hot water hot-water supply of Example 1, and the feed water temperature sensor 22 is used as an inlet side temperature sensor.

  In the above-mentioned embodiment, for example, considering the case where about 500 cc of boiling temperature water is supplied to cup noodles in about 10 to 20 seconds, the amount of water supply is 1.5 to 3.0 liters / minute, and the heating capacity is 10 to 20 kW. Therefore, the electric heater has an advantage that the electric capacity becomes large, and the gas water heater can be relatively small.

  The boiling temperature water obtained by the present invention has an advantage that the cooking time can be shortened by using it in a clay pot. In addition, for example, there is an advantage that boiled vegetables for cold shabu can be easily cooked, and further, there is an advantage that it can be used for thawing and sterilization.

  The boiling temperature water supply pipe 31 may be provided near a stovetop or a cooking stand separately from the sink. Further, it may be incorporated into a dishwasher and used for dishwashing. In this case, compared with the case where the conventional warm water of 60 ° C. to 70 ° C. is used, there are effects that the cleaning effect can be improved and the cleaning time can be shortened and the amount of water used can be reduced.

  The boiling temperature water pipe 11, the boiling temperature water supply pipe 31, and the boiling temperature water drain pipe for flowing boiling temperature water are covered with a material having higher heat insulation than the piping system for flowing hot water from the viewpoint of heat retention and prevention of burns. It is preferable to do. In particular, the boiling temperature water supply pipe 31 is preferably covered with a high heat insulating material such as ceramic or plastic because there is a risk of touching the hand.

  In addition, by reducing the pipe diameter of the pipe from the boiling temperature water supply port 12 to the switching valve 32 or by inserting a throttle, the flow resistance is increased compared with that in the hot water pipe system, and a large amount of boiling temperature water is generated. It is preferable not to come out suddenly. In this case, it is preferable that the flow resistance of the boiling temperature water supply pipe 31 is not reduced by increasing the pipe diameter so that the flow velocity at the outlet does not increase. According to such a configuration, the flow rate in the piping from the boiling temperature water supply port 12 to the switching valve 32 is increased, the heat capacity of the piping system is reduced and the time until the boiling temperature water is discharged can be shortened and discarded. There is an advantage that the amount of temperature water can be reduced.

As this invention, you may provide a water purifier in the upstream of the heat exchanger 4 for warm water, and the heat exchanger 6 for boiling temperature water.
As the alarm device 39, a lamp or the like may be used. Various means such as a bimetal can be adopted as means for sensing that boiling temperature water has been obtained instead of the outlet side temperature sensor 28. In the present invention, the time until the boiling temperature water comes out can be determined empirically with use, and therefore the thermometer 36 and the alarm device 39 may not be provided.

As the switching means, instead of the switching valve 32, a flow rate adjusting valve may be provided in each of the boiling temperature water supply pipe 31 and the boiling temperature water drain pipe 34.
The water vapor discharge unit 37a is configured such that water vapor from the water discharge unit 37a can be discharged to a place away from the human body. Moreover, it is comprised so that boiling temperature water may not come out there. That is, the pipe diameter is set so that the whole amount of boiling temperature water is discharged from the boiling temperature water supply unit 37b by gravity. For example, the inner diameter is designed to be about 8 to 20 mm for a water supply amount of 1.5 to 3.0 liters / minute.

  Further, since the water supply pressure varies depending on each customer, it is preferable to provide a throttle capable of adjusting the opening degree in the intermediate pipe 33 so that the water pressure at the inlet of the switching valve 32 can be adjusted. By performing such adjustment, it is possible to prevent burns caused by supplying an excessive amount of boiling temperature water, water supply at a low water temperature, and water supply at an excessive amount of water, which is useful.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows Example 1 of the tip-stop type gas water heater which concerns on this invention. It is a side view which shows the hot water supply system using the tip-stop type gas water heater which concerns on this invention. It is a front view of the principal part of a hot-water supply system. It is a block diagram. It is a block diagram which shows Example 2 of the tip-stop type gas water heater which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 4 ... Heat exchanger for warm water 5 ... Burner for warm water 6 ... Heat exchanger for boiling temperature water 7 ... Burner for boiling temperature water 8 ... Water supply pipe 9 ... Pipe for warm water 10 ... Hot water supply port 11 ... Pipe for boiling temperature water 12 ... Boiling temperature water supply port 22 ... Water supply temperature sensor (inlet side temperature sensor)
24 ... Hot water temperature sensor (inlet side temperature sensor)
28 ... Outlet temperature sensor 30 ... Sink 30a ... Sink 31 ... Boiling temperature water supply piping 32 ... Switching valve (switching means)
34 ... Boiling temperature water drain pipe 35 ... Drain pipe 37 ... Steam separator 37a ... Steam discharge section 37b ... Boiling temperature water supply section 40 ... Boiling temperature water quantity measuring means 41 ... Heat quantity calculating means 43 ... Fuel gas supply quantity control means 51 ... Water volume sensor (water volume measuring means)

Claims (4)

A boiling temperature water supply port for supplying boiling temperature water at or near the boiling temperature;
A hot water supply port for supplying hot water at a temperature lower than boiling temperature water;
A heat exchanger for boiling temperature water which is interposed in a piping for boiling temperature water connecting the boiling temperature water supply port and a water supply pipe to obtain boiling temperature water;
A boiling temperature water burner for heating the boiling temperature water heat exchanger;
A hot water heat exchanger which is provided in a hot water pipe connecting the hot water supply port and the water supply pipe to obtain hot water;
A hot water burner for heating the hot water heat exchanger;
A first-stop type gas water heater characterized by comprising: The front-end type gas water heater according to claim 1,
An inlet side temperature sensor for measuring the temperature of water supplied to the boiling temperature water heat exchanger;
An outlet-side temperature sensor for measuring the temperature of boiling temperature water taken out from the heat exchanger for boiling temperature water;
Water amount measuring means for measuring the amount of water supplied to the boiling temperature water heat exchanger;
The amount of heat for calculating the amount of heating heat necessary for obtaining boiling temperature water in the heat exchanger for boiling temperature water based on the temperature measured by the inlet temperature sensor and the amount of water measured by the water amount measuring means. A calculation means;
For boiling temperature water so that the heating heat amount calculated by the heat amount calculating means is obtained and the temperature of the boiling temperature water taken out from the heat exchanger for boiling temperature water measured by the outlet side temperature sensor becomes the boiling temperature. Fuel gas supply amount control means for adjusting the amount of fuel gas supplied to the burner;
A front-end gas water heater equipped with. A gas hot water system using the first-stop gas water heater according to claim 1 or 2,
A boiling temperature water supply pipe connected to the boiling temperature water supply port and supplying boiling temperature water to or near the sink;
A boiling temperature water drain pipe connected to the boiling temperature water supply port and drained to a sink or a drain pipe connected thereto;
Switching means for switching between a state where the boiling temperature water flows to the boiling temperature water supply pipe side and a state where the boiling temperature water flows to the boiling temperature water drain pipe side;
Equipped with gas hot water system. In the gas hot-water supply system according to claim 3,
A boiling temperature water supply pipe is provided with a water vapor separator that separates water vapor, a water vapor discharge unit that discharges the separated water vapor to the water vapor separator, and a boiling temperature water that flows down the boiling temperature water from which the water vapor has been separated. Gas hot water supply system that has a supply unit.

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