JPH11304257A - Tap water heater - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a hot water supply system with good usability and economy by controlling the water supply path of a water supply direct pressure type water heater that is supplied from a solar water heater and general water supply by arbitrarily selectable switching means. provide. SOLUTION: A solar water connection port 3 for connecting a solar water heater 2, a general water supply connection port 4, and a mixture of solar water supplied from the solar water connection port 3 and the general water supply connection port 4 with general water supply. An electric mixing valve 5, a temperature detector 6 for detecting the temperature of the mixed water mixed by the electric mixing valve 5, a heat exchanger 9 including a burner 8 for heating the mixed water, and a heat exchanger 9. A hot water supply port connected to the secondary side of the burner, and an operation unit 13 for instructing operation, stop, and hot water supply set temperature of the burner,
The operation unit 13 is provided with a switching unit that controls a water supply path to the heat exchanger 9 via the electric mixing valve 5 and can arbitrarily select a hot water supply operation mode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combination with a solar water heater (solar system) in a water supply direct pressure water heater having a hot water supply function.

[0002]

2. Description of the Related Art Conventionally, this type of system has a configuration as shown in FIG.

The configuration will be described below with reference to FIG. In FIG. 6, reference numeral 1 denotes a water heater, 2 denotes a solar water heater, and water is supplied from a water supply pipe 20. Hot water heated by the solar water heater 2 is discharged from a tap water pipe 21. Reference numeral 5 denotes a water channel switching valve to which a tapping pipe 21 and a water supply pipe 20 are inputted, and one of them is selected and connected to the output pipe 22. The waterway switching valve 5 generally uses an electrically operated valve and is provided with a switching switch (not shown) near the valve in many cases. Depending on the season, either the "solar" side or the "water supply" side is selected. Used as Others have the switch installed on the remote control of the water heater to further improve the usability. The hot water heater 1 is connected to the hot water supply curn 11 and the shower 23 after the output pipe 22 of the water channel switching valve 5 is input and heated.

Next, the operation of the above configuration will be described.
First, in summer, a sufficient temperature increase can be obtained with the solar water heater 2, so that the user sets and uses the water channel switching valve 5 on the solar side. At this time, the water channel switching valve 5 connects the tapping pipe 21 of the solar water heater 2 to the output pipe 22. Then, when the user uses the hot water supply curan 11 or the shower 23, the hot water of the solar water heater 2 is discharged from the tapping pipe 21 to the water channel switching valve 5 and the output pipe 2.
The water is supplied to the water heater 1 through the hot water supply 2 and is supplied from the outlet. At this time, if the hot water of the solar water heater 2 has risen to a sufficiently high temperature, the user uses the hot water heater 1 without turning on the operation. The operation will be turned on and the temperature will be further increased before use.

[0005] Next, in the winter season, since the solar water heater 2 cannot provide a sufficient temperature rise, the user sets and uses the water channel switching valve 5 to the water supply side. At this time, the water channel switching valve 5 connects the water supply pipe 20 to the output pipe 22. When the user uses the hot water supply curn 11 or the shower 23, water is supplied from the water supply pipe 20 to the water heater 1 through the water path switching valve 5 and the output pipe 22, where the water is heated and supplied from the hot water outlet.

[0006]

However, in such a system structure, there are many cases in which a hot water storage system is used as a hot water heater, in which case a pressure reducing valve must be provided on the input side of the hot water heater. However, when using a shower in the bathroom, the water pressure was weak, and there was a problem in terms of usability. On the other hand, in recent years, there have been many examples of using a water supply direct pressure water heater. However, due to the nature of the water heater, the controllable minimum combustion amount is limited (for example, 5000 Kcal), and the temperature of solar water is limited. For example, when the temperature is slightly lower than the hot water supply set temperature, even when the fuel is heated at the minimum combustion amount during use, the temperature may greatly exceed the set temperature, and there are problems in terms of usability and safety. In addition, when the solar water temperature becomes as high as 80 degrees or more due to overheating of the solar water heater in summer, etc., there is no means to lower the temperature in the water heater, so depending on the misuse of the user, high-temperature water There was a possibility of tapping directly from Kallang. Furthermore, the expectation of users who use such a combination of a solar water heater and a water heater is to use solar water as efficiently as possible and to bring about a merit in running cost. According to the method, when the water channel switching valve is used for supplying water, the contribution rate of the solar becomes zero during that time, and there is also a face that it cannot be said that it meets the expectations of the user.

[0007]

In order to solve the above-mentioned problems, a solar water connection port for connecting a solar water heater, a general water supply port, and a solar water supplied from the solar water connection port and the general water supply connection port are provided. An electric mixing valve for mixing water and general feed water; a temperature detector for detecting a temperature of the mixed water mixed by the electric mixing valve; a heat exchanger including a heat source for heating the mixed water; A hot water outlet connected to the secondary side of the exchanger,
An operation unit for instructing the operation, stop, and hot water supply set temperature of the heat source is provided.The operation unit controls a water supply path to the heat exchanger via the electric mixing valve, and arbitrarily selects a hot water supply operation mode. The switching means is provided.

[0008] According to the above invention, depending on the application, a single hot water supply of the solar water or a mixed water hot water supply in which the general water and the solar water are mixed at the specified temperature and supplied with the hot water, and further, the predetermined temperature is achieved by heating with the heat source. Since it is possible to select an optional hot water supply mode by operating the operation unit, such as performing hot water supply for supplying hot water, the usability is extremely improved, and an efficient hot water supply can be provided. But also.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The direct water pressure type water heater according to the first aspect of the present invention comprises a solar water connection port for connecting a solar water heater, a general water supply connection port, and the solar water connection port and the general water supply connection port. An electric mixing valve for mixing supplied solar water and general feed water, a temperature detector for detecting a temperature of the mixed water mixed by the electric mixing valve, and a heat source such as a burner for heating the mixed water. A heat exchanger, a hot water supply port connected to the secondary side of the heat exchanger, and an operation unit for instructing operation, stop, and hot water supply set temperature of the heat source, and the operation unit is provided with the electric mixing valve through the electric mixing valve. The water supply path to the heat exchanger is controlled in this way, and a switching means capable of arbitrarily selecting a hot water supply operation mode is provided.

[0010] Then, depending on the application, a single hot water supply of the solar water or a mixed water hot water supply in which the general water supply and the solar water are mixed at the specified temperature to supply the hot water, or a hot water heated to a predetermined temperature by the heat source is supplied. Since it is possible to select an arbitrary hot water supply mode by operating the operation unit such as performing hot water supply, the usability is extremely improved, and efficient hot water supply can be provided, which is economical.

In a second aspect of the present invention, there is provided a water supply direct pressure type water heater, wherein a switching means is fixed to an electric mixing valve on a water supply side and heating is performed by a heat source; Side and is switched to a second operation mode in which heating by a heat source is not performed.

[0012] Since the user can easily switch between the single hot water supply of the solar water and the hot water supply via the direct water supply type hot water supply machine at the operation section of the equipment, the case where the direct water pressure of the water supply is required by a shower or the like is required. Therefore, usability is improved.

[0013] In a third aspect of the present invention, there is provided a water supply direct pressure type water heater, wherein a switching means is fixed to an electric mixing valve on a water supply side to perform heating by a heat source; And hot water are mixed to control the hot water supply set temperature, and the mode is switched to a second operation mode in which heating by a heat source is not performed.

[0014] Even when the solar water heater overheats in summer or the like and the temperature is high, if it is used in the second operation mode, the water is mixed with water so that the temperature is set in advance by the user, and hot water is supplied. Therefore, problems in terms of usability and safety can be solved.

According to a fourth aspect of the present invention, there is provided a direct water supply type water heater of the present invention, wherein a switching means is fixed to an electric mixing valve on a water supply side and heating is performed by a heat source; And the water supply are mixed to control the hot water supply set temperature, and only when the mixed water temperature does not reach the hot water supply set temperature is the mode switched to the second operation mode in which heating by the heat source is performed.

When the second operation mode is used, when the temperature of the solar water is high, it is mixed with water to control the temperature to a set temperature, and when the solar water is low, the heat source is automatically heated to set the temperature. Since it operates so as to control the temperature, a hot water supply system that is easy to use throughout the year can be realized.

According to a fifth aspect of the present invention, there is provided a water supply direct pressure type water heater, wherein the switching means comprises: a first operation mode in which the electric mixing valve is fixed to the water supply side to heat the heat source; Mixing the water and the feed water to control the hot water supply set temperature, heating the heat source when the mixed water temperature is lower than the hot water supply set temperature, and controlling the electric mixing valve so that the hot water supply temperature becomes the set temperature; The mode is switched to the operation mode.

If the second operation mode is used, when the temperature of the solar water is close to the set temperature of hot water supply, water is appropriately mixed to lower the incoming water temperature, and the temperature is controlled to the set temperature by heating with a heat source. Therefore, the set temperature can be maintained at any time irrespective of the season and the used flow rate, and the solar contribution can be maximized.

[0019]

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

(Embodiment 1) FIG. 1 is a system diagram of a water supply direct pressure type water heater in Embodiment 1 of the present invention.

In FIG. 1, reference numeral 1 denotes a water supply direct pressure water heater.
An electric mixing valve 5 is provided for connecting and connecting a solar water connection port 3 from a solar water heater 2 and a water supply port 4 from a water pipe.
The water mixing thermistor 6 is a temperature detector for detecting the temperature of the mixed water mixed by the electric mixing valve 5, the flow rate sensor 7 for detecting the flow rate of the mixed water, and a heat source for heating tap water or mixed water. A heat exchanger 9 provided with a burner 8 (which may be another heat source, for example, an electric heater or the like), and a guide from the secondary side of the heat exchanger 9 to a hot water supply port cull 11 via a tapping thermistor 10. Hot water supply circuit 12 and operation switch 1
3a, a kitchen remote control 13 including a hot water supply temperature setting switch 13b, an operation mode switch 13c, and a liquid crystal display 13d, and control of a mixing ratio of the electric mixing valve 5, control of combustion of the burner 8, and 13 and a controller 14 that performs signal transmission. Then, by selecting a desired hot water supply mode with an operation mode switch 13c provided in the kitchen remote controller 13, a switching means for controlling the electric mixing valve 5 and switching a water supply path of the water supply direct pressure water heater 1 is constituted. ing.

Next, the operation will be described. First, the operation switch 13a of the kitchen remote controller 13 is turned on, and the operation mode is selected by the operation mode switch 13c. Here, two operation modes, “solar operation” and “boiler operation”, can be selected. The selected mode is displayed on the liquid crystal display unit 13d.

First, when the "boiler operation" mode is selected, the electric mixing valve 5 moves to the water side and is fully opened. Then, when the hot water supply curran 11 is opened and hot water is supplied in this state, water flows in from the water supply port 4, and at the same time, the flow rate sensor 7 detects the flow rate. The controller 14 controls the flow sensor 7
Is operated to start the combustion of the burner 8 in response to this signal. The amount of combustion is calculated from the temperature set value set by the remote controller 13, the incoming water temperature detected by the incoming water thermistor 6, and the flow rate. The water that has flowed in this way is heated by the heat exchanger 9 by receiving the combustion heat from the burner 8, and hot water at the set temperature of the remote controller 13 is supplied from the hot water supply curn 11. The hot water supply thermistor 10 is provided to correct a difference between the heated hot water temperature and the set temperature, and to control the hot water supply temperature more accurately.

The above operation is a so-called operation of a water heater, and in this usage, the hot water can be supplied as it is at the water supply pressure, so that a hot water supply such as a strong shower can be obtained.

Next, the operation when the hot water supply mode switch 13c is operated to switch the hot water supply mode to "solar operation" will be described.

FIG. 2 shows "solar operation" according to the first embodiment of the present invention.
4 shows a flowchart of the operation. When the mode is switched to the “solar operation” mode, the electric mixing valve 5 is switched from the water side to the solar water side fully open. Even if hot water is supplied in this state, the combustion of the burner 8 is kept off. Therefore, all hot water is supplied from the solar water connection port 3 through the electric mixing valve 5. If the temperature of the solar water is sufficiently raised in the summer, the hot water can be used from the hot water supply curan 11 as it is.

As described above, in the first embodiment, the remote controller 1
Switching between solar water and water supply direct pressure can be easily performed by operating the switch 3 to realize a convenient water supply system.

(Embodiment 2) FIG. 3 shows a flowchart of the "solar operation" operation in Embodiment 2 of the present invention.

Since the configuration is the same as that of the first embodiment, the same reference numerals are given and the description is omitted. In the “solar operation” mode in the second embodiment, first, after the electric mixing valve 5 is switched to the solar fully open side, the combustion of the burner 8 is kept off. When the hot water supply curn 11 is opened, this is detected by the flow rate sensor 7 and the temperature of the solar water detected by the water input thermistor 6 at this time is compared with a set temperature. If the incoming water temperature is high, the electric mixing valve 5 is driven to the water side, and control is performed so that the temperature detected by the incoming water thermistor 6 becomes the set temperature.

As described above, in the second embodiment, the heat of the solar water heater 2 is good in summer, and even if the temperature of the solar water rises to a high temperature, the solar water is mixed with water by the electric mixing valve 5 and set at the set temperature. Since hot water is supplied, there is an effect that states such as high-temperature hot water supply can be avoided.

(Embodiment 3) FIG. 4 shows a flowchart of the "solar operation" operation of Embodiment 3 of the present invention.

Since the configuration is the same as that of the first embodiment,
The same numbers are given and the description is omitted.

In the “solar operation” mode in the third embodiment,
First, the electric mixing valve 5 is switched to the solar fully open side. When the hot water supply curn 11 is opened, this is detected by the flow rate sensor 7 and the temperature of the solar water detected by the water input thermistor 6 at this time is compared with a set temperature. If the incoming water temperature is high, the mixing valve 5 is driven to the water side, and the incoming water thermistor 6 is driven.
The control is performed so that the temperature detected in the step becomes the set temperature. On the other hand, if the incoming water temperature is lower than the set temperature, the electric mixing valve 5 turns on the combustion of the burner 8 with the solar fully open, and controls the amount of combustion so that the hot water thermistor 10 reaches the set temperature.

As described above, in the third embodiment, in winter, when the solar water heater 2 does not collect heat sufficiently or when hot water is used up, the burner automatically burns and the set temperature is reduced. Since it operates so as to be maintained, an easy-to-use hot water supply system can be realized throughout the year.

(Embodiment 4) FIG. 5 shows a flowchart of the "solar operation" operation of Embodiment 4 of the present invention.

Since the configuration is the same as that of the first embodiment,
The same numbers are given and the description is omitted.

In the "solar operation" mode in the fourth embodiment,
First, the electric mixing valve 5 is switched to the solar fully open side. When the hot water supply curn 11 is opened, this is detected by the flow rate sensor 7 and the temperature of the solar water detected by the water input thermistor 6 at this time is compared with a set temperature. If the incoming water temperature is high, the electric mixing valve 5 is driven to the water side, and control is performed so that the temperature detected by the incoming water thermistor 6 becomes the set temperature. On the other hand, if the incoming water temperature is lower than the set temperature, the temperature rise when the burner 8 is burned at the minimum combustion amount is calculated from the flow rate detected by the flow rate sensor 7 at that time. And
The value is subtracted from the set temperature, and the electric mixing valve 5 is controlled so that the incoming water temperature becomes the value. Further, the combustion of the burner 8 is turned on, and the amount of combustion is controlled by the hot water thermistor 10 so as to reach the set temperature.

As described above, in the fourth embodiment, even when the solar water heater 2 does not collect heat sufficiently in winter and the temperature is slightly lower than the set temperature, the hot water supply temperature is maintained at the set temperature. Since the electric mixing valve 5 mixes solar water and water to control the temperature to an appropriate temperature, there is no problem that hot water is supplied at a temperature higher than the set temperature due to the minimum combustion limit.
Hot water supply with extremely stable temperature can be realized. Further, even when the burner 8 burns, the target control temperature of the electric mixing valve 5 is calculated so that the set temperature can be obtained with the minimum combustion amount, so that the energy collected by the solar water heater 2 is efficiently used. It can also be.

In this embodiment, the thermistor 6 is provided on the downstream side of the electric mixing valve 5 so as to control the electric mixing valve 5. However, a thermistor is added near the solar connection port 3. If it is provided, the temperature change of the solar water during the hot water supply can be detected, and when the temperature of the solar water rises during the combustion, the combustion is stopped at that time and the operation is switched to the hot water supply operation using only the electric mixing valve 5. This makes it possible to realize a system that can achieve higher efficiency.

[0040]

As described above, according to the direct water supply type hot water supply device of claim 1, hot water is supplied depending on the purpose of use, such as sole supply of solar water or mixing of general water and solar water to the specified temperature. It is possible to select any hot water supply mode by operating the operation unit, such as performing hot water supply, and further, heating hot water supply of hot water heated to a predetermined temperature by heating with a heat source, thereby greatly improving usability. It can provide efficient hot water supply and is also economical.

According to the second aspect of the present invention, the user can easily switch between the independent hot water supply of the solar water and the hot water supply via the direct water pressure water heater by using the operation unit of the equipment. Therefore, it is possible to improve usability in a case where direct water pressure is required in a shower or the like.

According to the third aspect of the present invention, even when the solar water heater overheats in summer or the like and the temperature is high, the user can set the water heater in the second operation mode in advance. To mix hot water with hot water
Ease of use and safety issues can be resolved.

According to the fourth aspect of the present invention, by using the second operation mode, when the temperature of the solar water is high, the solar water is mixed with water and controlled to the set temperature.
When the solar water is low, the heat source automatically burns and operates so as to control the temperature to the set temperature, so that an easy-to-use hot water supply system can be realized throughout the year.

According to the water supply direct pressure water heater of the fifth aspect, by using the second operation mode, when the temperature of the solar water is close to the set temperature of the hot water supply, water is appropriately mixed and the water is supplied. Since the temperature is lowered and the heat source is heated at night to control the set temperature, the set temperature can be maintained at any time regardless of the season and the flow rate used, and the solar contribution can be maximized.

[Brief description of the drawings]

FIG. 1 is a system diagram of a water supply direct pressure water heater according to a first embodiment of the present invention.

FIG. 2 is an operation flowchart of the water heater.

FIG. 3 is an operation flowchart of a water supply direct pressure water heater in Embodiment 2 of the present invention.

FIG. 4 is an operation flowchart of a water supply direct pressure water heater according to a third embodiment of the present invention.

FIG. 5 is an operation flowchart of a water supply direct pressure water heater according to a fourth embodiment of the present invention.

FIG. 6 is a system diagram of a conventional hot water supply system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Direct-pressure water heater of water supply 2 Solar water heater 3 Solar water connection port 4 General water supply connection port 5 Electric mixing valve 6 Temperature detector (input water thermistor) 8 Burner (heat source) 9 Heat exchanger 13 Operation unit (remote control) 14 Controller

Claims (5)

[Claims] A solar water connection port for connecting a solar water heater, a general water supply connection port, and an electric mixing valve for mixing solar water supplied from the solar water connection port and the general water supply connection port with general water supply. A temperature detector for detecting the temperature of the mixed water mixed by the electric mixing valve, a heat exchanger including a heat source for heating the mixed water, and a hot water supply port connected to a secondary side of the heat exchanger And an operation unit for instructing operation, stop, and hot water supply set temperature of the heat source, wherein the operation unit controls a water supply path to the heat exchanger via the electric mixing valve, and optionally sets a hot water supply operation mode. Water supply direct pressure water heater with switching means that can be selected. 2. The switching means comprises: a first operation mode in which the electric mixing valve is fixed to the water supply side to perform heating by a heat source; and a second operation mode in which the electric mixing valve is fixed to the solar water side to perform no heating by the heat source. The water supply direct pressure water heater according to claim 1, wherein the operation mode is switched. 3. A switching means for fixing a motor-driven mixing valve to a water supply side to perform heating by a heat source, and for controlling the temperature of the hot water supply by mixing solar water and general water by the motor-operated mixing valve. The water supply direct pressure water heater according to claim 1, wherein the water supply is switched between a second operation mode in which heating by a heat source is not performed. 4. The switching means controls a first operation mode in which an electric mixing valve is fixed to a water supply side and heating is performed by a heat source, and the electric mixing valve mixes solar water and water to control a hot water supply set temperature, 2. The water supply system according to claim 1, wherein the second operation mode in which heating is performed by a heat source is switched only when the temperature of the mixed water does not reach the hot water supply set temperature. 5. A switching means comprising: a first operation mode in which an electric mixing valve is fixed to a water supply side to perform heating by a heat source; and said electric mixing valve controls solar water and water supply to control a set hot water supply temperature; 2. The heating device according to claim 1, wherein when the mixed water temperature is lower than the hot water supply set temperature, the heating by the heat source is performed, and the operation mode is switched to a second operation mode for controlling the electric mixing valve so that the hot water supply temperature becomes the set temperature. Water pressure direct water heater.