JP2002310505A - External water heater-utilizing hot water supply apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an external water heater-utilizing hot water supply apparatus capable of supplying hot water at a set temperature securely at a low cost while contriving the omission of a water-mixing unit and the simplification of piping. SOLUTION: A hot water supply apparatus 1a is provided with a hot water supply connection opening 11, a water inlet connection opening 12 connected with water piping, a water outlet connection opening 13 communicating with water inlet pipe lines 31 and 32 and a hot water inlet connection opening 14. While city water is supplied to a hot water storage tank 41 from the water outlet connection opening through water supply piping 17, hot water is taken into an interconnecting pipe line 21 from the hot water inlet connection opening through hot water supply piping 18. In an external water heater 2a, a medium collects solar heat with a solar heat-collecting panel 42, and the water in the hot water storage tank is heated through heat exchange by a heat exchanger 43. When a faucet for hot water 15 is turned on, the hot water in the hot water storage tank 41 is taken into the hot water supply apparatus at the direct pressure of the city water. If the temperature of the hot water is low, the hot water is heated by a heater 23. After that, it is supplied to the faucet for hot water as it is, or after mixed with the water from the water inlet pipe line 33 by a hot and cold water-mixing means 24 for temperature control. If the hot water temperature is high, the heater is not operated. After it is mixed with water by the hot and cold water-mixing means for temperature control, the hot water is supplied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater which can be connected to an external water heater such as a solar water heater which converts water into hot water by receiving heat from an external heat source, and converts hot water converted by the external water heater. The present invention relates to a water heater using an external water heater configured to be used.

[0002]

2. Description of the Related Art Conventionally, as a water heater using external hot water equipment,
A combination of a solar water heater and a water heater is disclosed (for example, see Japanese Patent Application Laid-Open No. 2000-74502). In this device, a water mixing unit is interposed between a solar water heater and a water heater, and the water heater is mixed with the hot water generated by the solar water heater in the water mixing unit to provide a water mixing unit. The temperature is controlled below the set temperature. Then, after the hot water whose temperature has been adjusted in advance as described above is taken into the water heater, the water heater is heated to a set temperature for hot water supply or bath for hot water supply.

[0003]

However, the water heater using the external water heater disclosed above requires an extra water mixing unit to connect the solar water heater and the water heater. For this reason, the cost of the mixing unit itself,
There is a disadvantage that it is necessary to provide complicated piping to interpose the water mixing unit. In addition, coordination between the control of the mixing unit and the control of the water heater is required, which also complicates the control contents.

[0004] In addition, a water supply pipe under pressure is individually extended to each of the solar water heater and the water heater, and the water supply pipe is a pressure supply pipe. It takes time.

Further, in a solar water heater, the solar heat as its heat source fluctuates depending on the season, time, weather, and the like, and the temperature of the generated hot water also fluctuates greatly. Another drawback is that it is difficult to control the temperature. In addition, wasteful energy (for example, fuel) for heating may be consumed due to the fluctuation. In particular, when strict temperature control is not required, such as when pouring water from a water heater into a bath tub, wasteful consumption of energy may occur.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a water heater using an external water heater at a low cost by simplifying the configuration by simplifying piping. Another object of the present invention is to provide a water heater using an external water heater that can reliably supply hot water at a set temperature while omitting a water mixing unit.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, it is possible to connect to an external hot water device that converts water into hot water by receiving heat from an external heat source. The following specific items are provided for a water heater using an external hot water device configured to use the hot water converted by the device. That is, an inlet connection port for connecting a pressurized water pipe to which the pressurized water is supplied, and the pressurized water that is communicated with the inlet port and is supplied from the inlet port for hot water conversion to the external hot water equipment. And a hot water connection port for taking in hot water from the external hot water device for hot water supply. Here, the above-mentioned “pressurized water” is water at which a predetermined feed pressure is acting at the downstream end, for example, tap water supplied from a water supply or supplied from an elevated water tank by a head pressure. Tap water and the like. In this case, the “pressurized water pipe” is a water supply pipe.

According to the first aspect of the present invention, as a pipe for supplying water to the external water heater, only a simple connection pipe from the water outlet of the water heater to the external water heater is required. Therefore, it is not necessary to extend the pressurized water piping. In this case, the pressurized water flowing into the water heater from the water inlet connection port of the water heater to which the pressurized water pipe is connected is supplied to the external hot water equipment from the water outlet port. Therefore, it is only necessary to perform troublesome pipe connection work of the pressurized water pipe only to the water inlet connection port of the water heater. Then, the pressurized water can be supplied to both the water heater and the external hot water device only by this piping work, and the piping work of the individual pressurized water piping for both the external hot water device and the water heater which was conventionally required is omitted. Thus, simplification of the piping configuration and omission of the piping work can be realized.

In the case of the first aspect, the water outlet connection port and the hot water connection port are connected so as to communicate with each other via an external water heater, whereby the pressure-supplied pressure supplied from the water outlet port is increased. It may be configured such that hot water of the external hot water device is taken in through the hot water connection port by the pressure of water (claim 2). In this case, a means (for example, a pump) for taking hot water from an external hot water device into the hot water supply device through the hot water connection port becomes unnecessary.

[0010] In the invention according to claim 3, it is possible to connect to an external hot water device that converts water to hot water by receiving heat from an external heat source, and to use the hot water converted by the external hot water device. The following specific items will be provided for water heaters using external water heaters. That is, a water inlet connection port to which a pressurized water pipe for supplying pressurized water is connected, a hot water connection port for taking in hot water converted by the external water heater, a hot water connection port for hot water supply, and hot water mixing means. And as the hot water mixing means,
The structure is such that the pressurized water supplied from the water supply port and the hot water taken in from the water supply port are mixed at a variable mixing ratio and supplied to the hot water supply port for hot water supply.

According to the third aspect, the hot water is directly taken in from the external water heater and the temperature is adjusted by the hot water mixing means on the water heater side. It is possible to omit the mixing unit that had been used. As a result, the cost of the water mixing unit itself and the piping and piping work for interposing the water mixing unit are also omitted, and it is possible to provide a water heater using an external water heater that realizes a simplified piping configuration and low cost. Become. In this case, the water supply to the external hot water equipment is
The pressurized water may be supplied from the water heater side through the water outlet port as in the case of claim 1, or the water such as the above-described pressurized water pipe may be supplied to an external hot water device separately from the water heater. You may make it connect a supply pipe. This is the same in the following claim 4.

In the invention according to claim 4, the apparatus is configured to be connectable to an external hot water device that converts water into hot water by receiving heat from an external heat source, and to use the hot water converted by the external hot water device. The following specific items will be provided for water heaters using external water heaters. That is, an inlet connection port to which a pressurized water pipe for supplying pressurized water is connected, an incoming hot water connection port for taking in hot water converted by the external hot water device, a hot water supply connection port for hot water supply, and an upstream end. It is possible to switch between heating and non-heating of a communication pipe communicating with the hot water connection port and having a downstream end communicating with the hot water supply connection port, and hot water interposed in the communication pipe and passing through the communication pipe. Heating means, and hot water mixing means interposed in the communication pipe at a position downstream of the heating means, wherein the hot and cold water flowing from the water inlet is used as the hot water mixing means. Water and hot water passing through the communication pipe are mixed at a variable mixing ratio and supplied to the hot water supply connection port for hot water supply.

According to the fourth aspect, in addition to the operation of the third aspect by omitting the water mixing unit itself and piping for the water mixing unit, which has been conventionally required, the hot water can be reliably supplied from the water heater at the set temperature. Will be possible. That is, if the hot water taken into the water heater through the hot water connection port from the external hot water device is lower than the set temperature, the hot water is heated by the heating means,
Conversely, if the hot water taken in from the external hot water device is higher than the set temperature, the heating means is switched to non-heating, and the hot water mixing means mixes with the pressurized water to control the temperature. This makes it possible to supply hot water at the set temperature without fail.

According to the fifth aspect of the present invention, the apparatus can be connected to an external hot water device that converts water into hot water by receiving heat from an external heat source, and uses the hot water converted by the external hot water device. The following specific items will be provided for water heaters using external water heaters. In other words, an inlet connection port to which a pressurized water pipe for supplying the pressurized water is connected, and pressurized water that is communicated with the inlet port and is supplied from the inlet port for supplying hot water to the external hot water device for hot water conversion. An incoming hot water port, an incoming hot water connecting port that takes in the hot water generated by the external hot water device by the pressure of the pressurized water supplied from the outgoing water connecting port, and an upstream end connected to the incoming hot water connecting port and a downstream end. A communication pipe which is communicated with a hot water supply connection port for hot water supply, and a heating means interposed in the middle of the communication pipe to heat the hot water passing through the communication pipe so as to be capable of switching between heating and non-heating. Hot / water mixing in which the pressurized water which is interposed in the communication pipe at a position downstream of the heating means and flows through the communication pipe from the water inlet through the water inlet is branched and mixed so that the mixing ratio is variable. Means.

According to the fifth aspect, the first to fifth aspects are set forth.
All the effects obtained by claim 4 can be realized.

In the water heater using the external hot water apparatus according to any one of the first to fifth aspects, a hot water tank for storing hot water converted by the external hot water apparatus is provided. Connected to the pressurized water supply pipe so as to be able to supply pressurized water while communicating with the hot water, and connected to the hot water connection port so that the internal hot water can be supplied to the water heater side by the pressure of the pressurized water. It may be made to have been made (claim 6).

The external hot water device in the water heater using the external hot water device according to any one of claims 1 to 6 includes a solar heat collecting medium, reaction heat generated in the fuel cell system, and a heat pump. At least one of the high-temperature side circulating media may be used as an external heat source, and a configuration that converts water into hot water by heat exchange with the external heat source may be applied. When an external water heater (for example, a solar water heater) that uses a solar heat collecting medium as an external heat source is connected to the above-described water heater, the characteristics of the hot water converted by the external water heater vary with seasons and the like. This is particularly useful in the case of claim 4 or claim 5. In addition, when an external water heater utilizing the reaction heat generated in the fuel cell system as an external heat source is connected to the above-mentioned water heater, one of the heat supply systems in the coordination (cogeneration and heat supply) system is used. Can be provided. Further, when an external water heater using the high-temperature side circulating medium of the heat pump as an external heat source is connected to the above-mentioned water heater, energy can be effectively recovered by recovering waste heat of the heat pump used in the outdoor unit of the air conditioner or the like. Use is planned. At this time, for example, two or more types of external heat sources, such as a solar heat collecting medium and a high-temperature side circulating medium of a heat pump, may be used, and the external heat source and water may be exchanged with hot water to be converted into hot water. Good.

[0018]

As described above, according to the water heater using the external hot water device of the first or second aspect, the troublesome work of connecting the pressurized water pipe to the water inlet connection port of the water heater is achieved. It is sufficient to perform only this piping work, and the pressurized water can be supplied to both the water heater and the external hot water equipment. Thereby, the piping work of the individual pressurized water piping for both the external hot water equipment and the water heater, which has been conventionally required, can be omitted, and the piping configuration can be simplified and the piping work can be omitted. In particular, according to the second aspect, it is possible to eliminate the need for a means such as a pump for taking hot water from an external hot water device through the hot water connection port into the water heater.

According to the third aspect of the present invention, the water mixing unit conventionally interposed between the water heater and the external water heater can be omitted, and the cost of the water mixing unit itself can be reduced. In addition, it is possible to omit both the piping and the piping work for interposing the water mixing unit, thereby realizing simplification of the piping configuration and cost reduction.

According to the fourth aspect of the present invention, in addition to the effect of the third aspect by omitting the water mixing unit itself and the piping for the water mixing unit, which has been conventionally required, in addition to the external water heater, the water supply from the external water heater is adopted. The hot water supply at the set temperature can be reliably realized by the heating means and the hot water mixing means in the water heater regardless of the temperature of the hot water to be heated.

According to the fifth aspect of the present invention, all the effects obtained by the above-mentioned first to fourth aspects can be obtained.

According to the sixth aspect of the present invention, in addition to the effects of any one of the first to fifth aspects, a more preferable configuration is specified as the hot water heater using the external hot water device. can do.

Further, according to the water heater using the external water heater of claim 7, the external water heater in the water heater using the external water heater according to any one of the above-mentioned claims 1 to 6 is specified and further embodied. can do.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment> FIG. 1 shows a water heater using an external water heater according to a first embodiment of the present invention. This first
In the embodiment, a solar water heater 2a using a solar heat collecting medium as an external heat source is applied as an external water heater, and the hot water generated by the solar water heater 2a is used in the water heater 1a for hot water supply. It was made. The water heater 1a is a so-called instantaneous water heater.

The water heater 1a is provided with a hot water supply connection port 11, a water supply connection port 12, a water supply connection port 13, and a hot water connection port 14 which are exposed to the outside from the exterior cover. A hot water supply pipe 16 extending to one or a plurality of hot water taps 15 (only one is shown in the figure) is connected to the hot water supply connection port 11, and a water supply pipe as a pressurized water pipe is directly connected to the water supply connection port 12. Tap water as pressurized water is allowed to enter. The water connection port 13 has a water supply pipe 1 to be described later.
The downstream end of a hot water supply pipe 18, which will be described later, is connected to the hot water connection port 14.

Between the hot water supply connection port 11 and the hot water connection port 14, a communication pipe 21 having an upstream end connected to the hot water connection port 14 and a downstream end connected to the hot water connection port 11, respectively.
Are arranged. In the middle of the communication pipe 21, for example, a fin tube type heat exchanger 22, a heater 23 for heating the heat exchanger 21, and hot and cold water mixing at a position downstream of the heat exchanger 22. Means 24 are interposed. The heat exchanger 22 and the heater 23 constitute heating means for heating the hot water passing through the communication pipe 21. Here, the heater 23 in the illustrated example is constituted by a combustion burner for burning a liquid fuel such as petroleum or a gaseous fuel such as propane gas, a blowing fan for supplying combustion air, and the like. However, the heater may be constituted by, for example, an electric heater.

In addition, a communication line 21 between the heat exchanger 22 and the hot water connection port 14 has a hot water flow sensor 25 for detecting a flow rate of the hot water taken into the water heater 1a, A warm water temperature sensor 26 for detecting the temperature is interposed. The heat exchanger 22 and the hot and cold water mixing means 2
4 is provided with a can body temperature sensor 27 for detecting the temperature of hot water after passing through the heat exchanger 22,
Communication line 2 between hot and cold water mixing means 24 and hot water supply connection port 11
1 is reduced by a predetermined amount from the fully open state, so that the heat exchanger 21
Is provided with a hot water supply amount control valve 28 for adjusting the amount of heat received.

An upstream end of a water inlet line 31 is connected to the water inlet port 12, and a downstream side of the water inlet line 31 is connected to the first end.
It is branched into a water inlet line 32 and a second water inlet line 33.
The downstream end of the first water inlet line 32 is connected to the water outlet 13, and the second water inlet line 33 is provided with a water temperature sensor 34 for detecting the temperature of tap water that is fed on the way, and the downstream side thereof. The end is connected to the hot and cold water mixing means 24.

The hot water mixing means 24 has a built-in water mixing adjusting valve (not shown), and a predetermined flow rate of water (tap water) is supplied from the second water inlet pipe 33 to the communication pipe 2 by the water mixing adjusting valve.
By mixing the hot water passing through 1 at a predetermined mixing ratio, the temperature of hot water supplied from hot water supply connection port 11 is adjusted to a predetermined set temperature.

The heater 23, the hot and cold water mixing means 24 and the hot water supply control valve 28 are controlled by the controller 3. The controller 3 includes, for example, a set temperature for hot water supply set by a user with respect to a remote controller (remote controller) 3a, and each of a temperature from a heated water flow sensor 25, a heated water temperature sensor 26, a can body temperature sensor 27, and a water temperature sensor 34. Upon receiving the output of the detected value, the heater 2 is turned on in accordance with the temperature of the hot water taken in from the solar water heater 2a.
In addition to controlling the amount of heating and the degree of opening of the hot water supply amount control valve 28, the mixing ratio in the hot and cold water mixing means 24 is changed and controlled according to the temperature of tap water taken in from the water inlet port 12. I have.

On the other hand, the solar water heater 2a is
A solar heat exchanger 42, a heat exchanger 43 constituted by heat exchange coils and the like and arranged in a hot water storage tank 41, and a circulating pump 44 for collecting heat between the heat exchanger 43 and the solar heat exchanger 42. And a circulation path 45 for circulating the heat medium.

A downstream end of the water supply pipe 17 is connected to the bottom of the hot water storage tank 41 and a hot water supply pipe 1 is connected to the top.
8 upstream ends are provided. The hot water tank 41 is filled with tap water from the water inlet 12 of the water heater 1a through the water inlet line 31, the first water inlet line 32, the water outlet 13 and the water supply pipe 17, and the hot water tap 15 is filled. When opened, the hot water in the hot water storage tank 41 is heated by the direct pressure of the water pipe (pressure of the water to be pressurized), the hot water supply pipe 18, the incoming hot water connection port 14, and the communication pipe 2.
1. The hot water is supplied to the hot water tap 15 through the hot water supply connection port 11 and the hot water supply pipe 16.

In the above-mentioned solar water heater 2a,
The heat collection medium circulated by the circulation pump 44 collects solar heat in the solar heat exchanger 42 to become high temperature, and the heat of the high-temperature heat collection medium is exchanged with water in the hot water storage tank 41 in the heat exchanger 43. While the water is converted to hot water, the low-temperature heat collecting medium is supplied to the solar heat exchanger 42 and heated again.

In the water heater using the external hot water equipment of the first embodiment, the following control is performed by the controller 3 to supply hot water at a predetermined set temperature. That is, when hot water tap 15 is opened and hot water is taken in from hot water storage tank 41 through hot water connection port 14, first, if the temperature of hot water detected by hot water temperature sensor 26 is lower than the set temperature, heater 23 is operated for combustion. The hot water passing through the communication pipe 21 is heated to a predetermined temperature. In this case, the above-mentioned combustion operation may be controlled (for example, FF control and FB control) so that the hot water is heated to a set temperature, or the above-mentioned combustion operation becomes higher than the set temperature by a predetermined value. May be controlled as described above. In the case of the former control, the mixing ratio in the hot and cold water mixing means 24 is set to 0,
The mixing amount of tap water from the water inlet line 33 is set to 0, and in the case of the latter control, the mixing ratio in the hot and cold water mixing means 24 is determined by the detected hot water output temperature after heating by the can body temperature sensor and the input water temperature sensor 34. The hot water supply temperature after mixing is determined to be the set temperature based on the detected water input temperature, and the hot water after mixing may be supplied to hot water tap 15. At this time, hot water mixing means 2
If both the communication pipe 21 and the second water inlet pipe 33 connected to the pipe 4 have the same pipe diameter, the supply pressure is the same as the tap water pressure. It will be determined by the temperature.

When the heater 23 is operated for combustion, the hot water supply control valve 28 may be fully opened if the temperature can be adjusted to the set temperature by the combustion operation within the range up to the maximum capacity. Conversely, if the detected temperature of the incoming water is considerably lower than the set temperature or the flow rate is large,
If the heating at or above the set temperature does not catch up with the setting of the combustion operation at the maximum capacity, the hot water supply control valve 28 may be throttled by a predetermined amount to reduce the flow rate.

On the other hand, when the hot water tap 15 is opened,
If the detected temperature of the hot water taken in from the hot water storage tank 41 is higher than the set temperature, the heater 23 is set to the non-combustion state, and the hot water is allowed to flow as it is to the hot / water mixing means 24. The hot water is supplied to the hot water tap 15 after mixing the incoming water and adjusting the temperature to the set temperature.

<Second Embodiment> FIG. 2 shows a water heater using external water heaters according to a second embodiment of the present invention. This second
This embodiment is the first in that a solar water heater 2a using a solar heat collecting medium as an external heat source is applied as an external water heater.
In common with the embodiment, the configuration of a water heater 1b that uses hot water generated by the solar water heater 2a for hot water supply is different from that of the first embodiment. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and detailed description thereof will be omitted.

The water heater 1b is a water heater having a forced circulation type reheating function for the bathtub 5 and an automatic hot water filling function. That is, the water heater 1b includes a water heater circuit 51,
It has a reheating circuit 52 and a bath pouring circuit 53 for pouring hot water from the hot water supply circuit 51 into the reheating circuit 52.

The hot water supply circuit 51 includes a hot water supply pipe 54 connected to the hot water connection port 14 and a first heat exchange can 55.
Heat exchanger 56 disposed therein, a combustion burner 57 and a blower fan 58 constituting heating means together with the heat exchanger 56.
And a tapping pipe 59. A downstream end of a water inlet line 61 that is connected to the water inlet connection port 12 and guides tap water to a downstream position of the can body water amount control valve 60 is connected to the outlet line 59. The pouring line 63 of the bath pouring circuit 53 is located downstream of the control valve 62.
Are branched and the downstream end of the tapping pipe 59 is connected to the hot water supply connection port 11. The hot water supply port 14 and the hot water supply port 11 are formed by the hot water supply pipe 54 and the hot water supply pipe 59.
And a communication conduit which communicates with.

The hot water pipe 54 is connected to the hot water pipe 54.
The hot water in the hot water storage tank 41 is heated through the hot water connection port 14, and a hot water flow sensor 64 and a hot water temperature sensor 65 are interposed on the way. A tapping temperature sensor 66 is provided in the tapping pipe line 59 at a position downstream of the hot water supply amount control valve 62. A water pipe 19 as a pressurized water pipe is directly connected to and connected to the water inlet port 12, and the water inlet pipe 6 extending from the water inlet port 12.
The branch pipe branches from the middle of 1 and is connected to the water connection port 13 so that tap water from the water supply pipe 19 can be supplied to the water connection port 13. The inlet pipe 61 has an inlet water flow rate sensor 67, an inlet water temperature sensor 68, and a water mixing amount control valve 69 as a hot-water mixing means for mixing the hot water in the hot-water outlet pipe 59 with a variable mixing ratio. It is interposed. Further, the pouring solenoid valve 70 is provided in the pouring line 63.
And a check valve 71 of a two-stage arrangement, and the downstream end of the pouring line 63 is connected to an incoming pipe 72 of a reheating circuit 72 described later.
It is connected in the middle of a.

The reheating circuit 52 includes a reheating circuit 72 for circulating hot and cold water with the bath 5 and a heat exchange can 7.
3 includes a heat exchanger 74, a combustion burner 75, and a blower fan 76. The reheating circuit 72
Is a water pipe 72a through which the hot water heated in the heat exchanger 73 flows into the bathtub 5 and the hot water in the bathtub 5 is transferred to the heat exchanger 7
The circulating pump 77, the water flow switch 78, and the bath temperature sensor 79 are interposed in the return pipe 72b. Then, the operation of the circulation pump 77 and the combustion burner 75 and the like causes the hot and cold water in the bathtub 5 to be circulated and reheated.

A gas supply line 80 extending from a fuel connection port 10 connected to a supply source of a fuel gas (eg, LPG) as fuel is connected to the two combustion burners 57 and 75. Is provided with a source gas solenoid valve 80a as a source plug and an electromagnetic gas proportional valve 80b for adjusting a gas supply amount in this order from the supply source side. And
The fuel gas supplied by the gas supply line 80 is selectively supplied to both the combustion burners 57 and 75.

The operation of the water heater 1b is controlled by a controller 4 having an MPU, a memory, and the like. The controller 4 has a remote controller for inputting various commands by a user and displaying a status. Remote controller) 41 is connected. The controller 4 controls the hot water supply circuit 51 to control the operation of the hot water supply circuit 51.
Various controls such as hot water filling control and bath control for controlling the operation of the reheating circuit 52 are performed.

On the other hand, the solar water heater 2a has a first
Although the detailed description is omitted because it has the same configuration as that described in the embodiment, the water supply to the hot water storage tank 41 is performed by the same configuration as in the first embodiment. That is, tap water from the water supply pipe 19 passes through the water inlet port 12 of the water heater 1b, a part of the water inlet pipe 61, the branch pipe and the water outlet port 13, and is connected to the water supply pipe 13 to be connected thereto. The hot water is supplied to the bottom of the hot water storage tank 41 through 17. That is, water is supplied to the hot water storage tank 41 based on the direct pressure (pressure of the water to be pressurized) of the water supply pipe 19 via the water heater 1b.

Next, control by the controller 4 in the second embodiment will be described with reference to FIGS. First, hot water supply control for the hot water tap 15 will be described with reference to FIG. When the hot water tap 15 is opened, the water pipe 19
The hot water in the hot water storage tank 41 is taken into the hot water pipe 54 through the hot water supply pipe 18 and the hot water connection port 14 under the direct pressure from the hot water storage tank 41. Then, when the flow rate of the warm water detected by the warm water flow sensor 67 exceeds the MOQ (minimum operating flow rate), control is started (YES in step S1), and the warm water temperature detected by the warm water temperature sensor 68 is reduced to a predetermined value. If the temperature is equal to or lower than the reference temperature (for example, 60 ° C.), the combustion burner 57 is operated to heat the hot water taken in from the hot water storage tank 41 (YES in step S2, step S3). That is, the original gas solenoid valve 80a and the gas proportional valve 80b are opened to ignite the combustion burner 57. At this time, an amount of combustion air corresponding to the amount of fuel gas supplied is supplied from the blower fan 58.

Next, when the combustion state of the combustion burner 57 is the maximum capacity and the tapping temperature detected by the tapping temperature sensor 66 is lower than the set temperature (for example, 42 ° C.) for hot water supply set on the remote controller 4a. Is (YE in step S4)
S), after the hot water supply amount control valve 62 is squeezed by a predetermined amount so that the hot water temperature becomes equal to or higher than the set temperature, the gas proportional valve 80b
Control is performed on the opening degree and the rotation speed of the blower fan 58, that is, the proportional control on fuel and air is performed (step S).
5 and S6). Conversely, if the hot water temperature is equal to or higher than the set temperature in step S4 (NO in step S4), the control of the hot water supply amount control valve 62 is not performed (while remaining fully open), and the proportional control of fuel and air in step S6 is performed. Do. The case where the temperature is lower than the set temperature despite the combustion at the maximum capacity in step S4 is, for example, the case where the flow rate is a large flow rate equal to or more than a predetermined amount (for example, 3 liters / minute). Further, in the above processing, the can body water quantity control valve 60 is in the fully opened state.

Then, the water supplied from the water inlet pipe 61 is mixed at a predetermined mixing ratio set by adjusting the opening of the water mixing amount control valve 69, and hot water whose temperature has been adjusted to the set temperature is supplied to the hot water supply connection port 11.
Then, hot water is supplied to hot water tap 15 through hot water supply conduit 16 (step S7).

On the other hand, the hot water taken into the hot water pipe 54 from the hot water storage tank 41 in the above-mentioned step S2 is changed to the reference temperature (60).
° C) (N in step S2).
O), the combustion burner 57 is set to a non-combustion state, passes through the heat exchanger 56 without heating, and controls the temperature by mixing with tap water by the mixing control valve 69 (step S7). On this occasion,
There is a possibility that the temperature of the tap water supplied from the water inlet line 61 may fluctuate due to seasonal fluctuations or the like. If the temperature is too high, it may be difficult to control the temperature to the set temperature (for example, 42 ° C.) even if the water is mixed. Therefore, the control according to the incoming temperature of the tap water currently being supplied (the value detected by the incoming water temperature sensor 68) is interposed. In other words, for example, when the actual water inlet temperature is higher than the calculated value of the water inlet temperature required to control the temperature to the set temperature when the maximum mixing ratio (the mixing amount of water is set to the maximum) (YES in step S8), The flow rate of the hot water is limited by narrowing the opening of the can body water quantity control valve 60 until the temperature can be adjusted to the set temperature (step S9), and then the water mixing control in the step S7 is performed. On the other hand, if the actual incoming water temperature is lower than the above calculated value in step S8 (NO in step S8), the can body hot water quantity control valve 60 is kept in the fully opened state and step S7 is performed.
Water mixing control at

When the user closes the curan 15 and the hot water flow rate detected by the hot water flow sensor 64 is lower than the MOQ (NO in step S1), the above operations are stopped and the hot water supply control is stopped. Is done.

As described above, even if the temperature of the hot water taken into the water heater 1b from the hot water storage tank 41 fluctuates greatly due to seasonal fluctuations or the like, the hot water supply to the hot-water tap 15 is reliably performed at the set temperature for hot water supply without the so-called cold water sandwich phenomenon. It can be performed in a state where it is done. Moreover, if the temperature of the hot water in the hot water storage tank 41 is equal to or higher than the predetermined temperature, hot water can be supplied at the set temperature without burning the combustion burner 57.

Next, the filling control for the bathtub 5 will be described with reference to FIG. 4. First, when the automatic flow switch of the remote controller 4a is turned ON (YES in step S11), the automatic flow lamp of the remote controller 4a is turned on. Is turned on (step S12). Next, the hot water supply control valve 62 is fully closed, the pouring solenoid valve 70 is fully opened, and then the hot water supply control valve 62 is fully opened (steps S13 to S1).
5). Thereby, the hot water in the hot water storage tank 41 is
The hot water is supplied to the hot water supply pipe 54 through the hot water supply pipe 18 and the hot water connection port 14 by receiving the direct pressure from the hot water, and the taken hot water is discharged from the hot water discharge pipe 59, the pouring water pipe 63, and the reheating circuit 72. Through the outflow pipe 72a.

Then, when the flow rate of the hot water detected by the hot water flow sensor 67 exceeds the above MOQ, the control is started (YES in step S16), and the hot water temperature sensor 6
If the temperature of the hot water detected by the controller 8 is lower than the temperature set for the bath set on the remote controller 4a, the combustion burner 57
Is heated in the same manner as in step S3 (see FIG. 3) described above to heat the hot water taken in from the hot water storage tank 41 (YES in step S17, step S18).

Next, even if the combustion state of the combustion burner 57 is set to the maximum capacity, if the tapping temperature detected by the tapping temperature sensor 66 is lower than the bath set temperature (YES in step S19), the hot water supply control is performed. Control for reducing the valve 62 by a predetermined amount and proportional control for fuel and air are performed in the same manner as in steps S5 and S6 (steps S20 and S21). Conversely, if the tapping temperature is equal to or higher than the set temperature in step S19 ( (NO in step S19), hot water supply amount control valve 6
Step S21 without performing the control of Step 2 (while remaining fully open)
The fuel and air proportional control are performed. It should be noted that also in the case of the conventional control, the can body water quantity control valve 60 is fully opened.

Then, the water from the water inlet line 61 is mixed at a predetermined mixing ratio set by adjusting the opening degree of the water mixing amount control valve 69, and hot water whose temperature has been adjusted to the set temperature passes through the pouring line 63. It is supplied to the outgoing pipe 72a of the reheating circuit 72,
The hot water is dropped into bathtub 5 through going pipe 72a (step S22).

On the other hand, in step S17, the hot water tank 41
If the warm water taken into the warm water pipe 54 from above is higher than the bath set temperature (N in step S17)
O), the combustion burner 57 is passed through the heat exchanger 56 without heating in a non-combustion state, and the temperature is controlled by mixing with tap water by the mixing control valve 69 (step S22). In this case, similarly to the case of the hot water supply control of FIG. 3, control similar to steps S8 and S9 described above is interposed in consideration of temperature fluctuation (seasonal fluctuation or the like) of tap water supplied from the water inlet line 61. I have. That is, for example, if the actual incoming water temperature is higher than the calculated value of the incoming water temperature necessary to control the temperature to the bath set temperature when the maximum mixing ratio is set (Y in step S23).
ES), the flow rate of the hot water is restricted by narrowing the opening of the can body water quantity control valve 60 until the temperature can be adjusted to the set temperature (step S24), and the water mixing control in the step S22 is performed.
On the other hand, if the actual incoming water temperature is lower than the above calculated value in step S23 (NO in step S23), the water mixing control in step S22 is performed while the can body hot water amount control valve 60 is kept fully open.

When a predetermined pouring amount up to a predetermined water level in bathtub 5 is poured, pouring solenoid valve 70 is closed to stop pouring control. Thereafter, reheating control is performed so as to keep the hot water temperature in the bathtub 5 constant.

In the above hot water filling control, the hot water storage tank 41
If the temperature of the hot water in the inside is higher than the set temperature for the bath, the combustion burner 57 is set in a non-combustion state while saving energy.
The bath can be filled with the bath temperature set by the user.

<Other Embodiments> The present invention relates to the first embodiment.
The present invention is not limited to the second embodiment, and includes various other embodiments. That is, in the first and second embodiments, the example in which the solar water heater 2a is used as the external water heater is shown. However, other external water heaters and the water heaters 1a and 1b may be combined. .

For example, FIG. 5 shows an embodiment in which an external hot water device 2b comprising a heat pump 8 and a water heater 1a are combined. In this case, in the heat pump 8 illustrated in the figure, a compressor 82 and an expansion valve 83 are interposed in a circulation path 81 of the circulation medium, and the circulation medium compressed by the compressor 82 to a high temperature and a high pressure. The first heat exchanger 84 heat-exchanges water supplied from the hot water storage tank 41 through the circulation path 87 by the operation of the pump 86. Then, after the circulating medium expanded to a low temperature and a low pressure by the expansion valve 83 absorbs heat by heat exchange with the outside air in the second heat exchanger 85, it is compressed again in the compressor 82 to a high temperature and a high pressure. It has become. The operation of the heat pump 8 causes the hot water tank 1
The filled tap water supplied through the water supply pipe 17 from the water connection port 12 of FIG. 1A is converted into hot water. That is, the circulating medium on the high temperature side is converted into hot water using the external heat source. The water heater combined with the external water heater 2b is the water heater 1a.
Alternatively, the water heater 1b according to the second embodiment may be applied.

FIG. 6 shows an external water heater 2c for converting the reaction heat generated in the fuel cell system 9 into hot water.
And an example in which the water heater 1a is combined. The fuel cell system 9 includes a reformer 91 for steam reforming a raw material gas, and a fuel cell 92 for generating electricity by receiving a supply of a reformed gas mainly composed of hydrogen and oxygen (air). It is. Then, the reformer 91 and the fuel cell 9
Waste heat (waste hot water or the like) generated by each reaction of No. 2 is individually taken out and led to the first and second heat exchangers 93 and 94, and the heat exchangers 93 and 94 operate the pump 95 from the hot water storage tank 41. The water supplied through the circulation path 96 is heat-exchanged and heated. As a result, the tap water supplied to the hot water storage tank 41 from the water outlet 12 of the water heater 1a through the water supply pipe 17 and filled therein is converted into hot water. That is, waste heat (reaction heat) generated in the fuel cell system is converted into hot water as an external heat source. The water heater combined with the external water heater 2c may be the water heater 1b according to the second embodiment in addition to the water heater 1a.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a second embodiment.

FIG. 3 is a flowchart illustrating hot water supply control according to a second embodiment.

FIG. 4 is a flowchart showing hot water filling control according to a second embodiment.

FIG. 5 is a schematic diagram showing a form in which an external hot water device using a heat pump is connected to a water heater.

FIG. 6 is a schematic diagram showing a form in which an external hot water device using a fuel cell system is connected to a water heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1a, 1b Water heater 2a, 2b, 2c External water heater 8 Heat pump 9 Fuel cell system 11 Hot water supply port 12 Water inlet port 13 Water outlet port 14 Hot water connection port 19 Water supply pipe (pressurized water pipe) 21 Communication line 22 Heat exchanger (heating means) 23 Heater (heating means) 24 Hot water mixing means 41 Hot water storage tank 54 Hot water supply pipe (communication pipe) 56 Heat exchanger (heating means) 57 Combustion burner (heating means) 59 Hot water supply pipe (Communication line) 69 Water mixing amount control valve (hot water mixing means)

 ──────────────────────────────────────────────────続 き The continuation of the front page F term (reference) 3L025 AA01

Claims (7)

[Claims] An external water heater using an external water heater configured to be connectable to an external water heater that converts water into hot water by receiving heat from an external heat source and configured to use the hot water converted by the external water heater. And an inlet connection port for connecting a pressurized water pipe to which the pressurized water is supplied, and pressurized water which is communicated with the inlet port and is supplied from the inlet port to the external hot water equipment with hot water. A hot water supply device using an external hot water device, comprising: an outlet connection port for supplying water for conversion; and a hot water connection port for taking in hot water from the external hot water device for hot water supply. 2. The water heater using an external hot water device according to claim 1, wherein the outlet connection port and the input hot water connection port are connected to communicate with each other via the external hot water device, and supplied from the outlet port. The hot water of the external hot water device is configured to be taken in through the hot water connection port by the pressure of the water to be pressurized,
Water heater using external hot water equipment. 3. A water heater using an external water heater that is connectable to an external water heater that converts water into hot water by receiving heat from an external heat source and is configured to use the hot water converted by the external water heater. An inlet connection to which a pressurized water pipe for supplying pressurized water is connected, an inlet / outlet water connection for taking in hot water converted by the external hot water device, a hot water supply connection for hot water supply, and hot water A mixing means, wherein the hot and cold water mixing means mixes the pressurized water supplied from the water supply connection port and the hot water taken in from the hot water supply port with a variable mixing ratio, and mixes the hot water supply port with the hot water supply port. A water heater using an external water heater, which is configured to supply water for hot water supply. 4. A water heater using an external water heater that is connectable to an external water heater that converts water into hot water by receiving heat from an external heat source, and that is configured to use the hot water converted by the external water heater. An inlet connection to which a pressurized water pipe for supplying pressurized water is connected, an inlet / outlet water connection for taking in hot water converted by the external hot water device, a hot water supply connection for hot water supply, and an upstream. A communication pipe having an end communicating with the hot water connection port and a downstream end communicating with the hot water supply connection port; heating and non-heating of hot water interposed in the communication pipe and passing through the communication pipe; A heating means for switchably heating; and a hot and cold water mixing means interposed in the communication pipe at a position downstream of the heating means, wherein the hot and cold water mixing means receives pressure from the water inlet. Mix water with warm water passing through the communication conduit. External water heater use water heater, characterized in that it is configured to provide for hot water supply to the hot water supply connection port are mixed in a ratio variable. 5. A water heater using an external water heater that is connectable to an external water heater that converts water into hot water by receiving heat from an external heat source and is configured to use the hot water converted by the external water heater. And an inlet connection port to which a pressurized water pipe for supplying the pressurized water is connected, and the pressurized water that is communicated with the inlet port and is supplied from the inlet port for hot water conversion to the external hot water device. An inlet port for supplying hot water generated by the external hot water device with pressure of pressurized water supplied from the outlet port, and an upstream end communicating with the inlet port. A communication pipe having a downstream end communicated with a hot water supply connection port for hot water supply; and heating means interposed in the communication pipe and heating the hot water passing through the communication pipe so as to be capable of switching between heating and non-heating. And the downstream position of this heating means Hot / water mixing means for branching and introducing pressurized water, which is interposed in the communication conduit and passed through the communication conduit from the water inlet, to mix the mixture at a variable mixing ratio. A water heater using an external water heater. 6. The hot water supply device according to claim 1, further comprising: a hot water storage tank for storing hot water converted by the external hot water equipment. The hot water connection port is connected to the pressurized water supply pipe so that the pressurized water can be supplied in a state where the hot water is communicated with the hot water, while the internal hot water can be supplied to the water heater by the pressure of the pressurized water. A water heater that uses an external water heater that is connected to the water heater. 7. The water heater using the external water heater according to any one of claims 1 to 6, wherein the external water heater is a solar heat collecting medium, reaction heat generated in the fuel cell system, and A water heater using an external hot water device, wherein at least one of the high-temperature side circulating media of the heat pump is used as an external heat source, and heat is exchanged with the external heat source to convert water into hot water.