JP2003065604A - Hot water supplying apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water supplying apparatus capable of securing smooth rotation of the valve element of a electric mixing valve. SOLUTION: The electric mixing valve 7 is provided with a valve element 15 rotatable around a shaft. In a hot water full opening position, the valve element 15 shuts off a cold water passage 19 and guides hot water in a hot water passage 18 to a mixing water passage 25. In a cold water full opening position, a cold water passage 18 is shut off and hot water and cold water in the cold water passage 19 are guided to a mixed water passage 25. In an intermediate position, a passage 13 in a valve element is provided to guide hot water and cold water in the hot water passage 18 and the cold water passage 19 to a mixture water passage 25. And, in a hot water full opening position, a leak hole 22 through which a micro-amount of cold water in the cold water passage 19 is guided to the passage 13 in the valve element is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater connected to a solar water heater.

[0002]

2. Description of the Related Art Conventionally, this type of water heater system is shown in FIG.
The configuration was as shown in.

In FIG. 4, 1 is a solar water heater, 2 is a water heater, and 34 is a water channel switching valve. The cold water from the water pipe is directly introduced into the water passage switching valve 34 from the cold water passage 30 and is warmed by the solar water heater 1 and introduced into the hot water passage 31 as hot water. The water channel switching valve 34 supplies selected hot water or cold water from the hot water passage 31 and the cold water passage 30 to the water heater 2 through the water supply passage 32. Generally, an electric valve is used as the water passage switching valve 34, and a switch (not shown) for switching is provided in the vicinity thereof in many cases. Depending on the season, the hot water in the hot water passage 31 and the cold water in the cold water passage 30 may be changed. Select one to use. In addition, there is a remote controller of the water heater 2 which is provided with the switch to further improve the usability. In the hot water supply device 2, the hot water or cold water is heated by the hot water supply device 2 as needed, and then hot water is supplied to the hot water supply curran 35 and the shower 33.

Next, the operation of the above configuration will be described. First, in the summer, since the solar water heater 1 can sufficiently raise the temperature, the user sets the water channel switching valve 34 on the hot water passage 31 side for use. When the user uses the hot water supply curran 35 or the shower 33, the hot water of the solar water heater 1 is introduced into the water heater 2 from the hot water passage 31 through the water passage switching valve 34 and the water supply passage 32. At this time, if the hot water of the solar water heater 1 has sufficiently risen, the user uses it without turning on the operation of the water heater 2, and if the temperature of the hot water does not rise sufficiently, turn on the operation of the water heater 2. , The temperature will be raised further before use.

Next, in the winter season, the solar water heater 1 cannot obtain a sufficient temperature rise, so the user sets the water channel switching valve 34 on the cold water passage 30 side for use. Then, when the hot water supply curran 35 and the shower 33 are used, the cold water is cooled by the cold water passage 3
From 0 through the water passage switching valve 34 and the water supply passage 32
It is introduced into the room, heated there, and then tapped.

However, in such a system structure, when the water temperature of the solar water heater 1 reaches a high temperature of 80 ° C. or higher due to excessive heat collection in the summer, the water heater 2 has means for lowering the temperature. Therefore, there is a possibility that hot water may be directly discharged from the currant 35 or the shower 33 due to misuse by the user.

In response to such a problem, in recent years, as shown in FIG. 5, an electric mixing valve 36 for mixing hot water and cold water is provided in the water heater 2, and the electric mixing valve 36 is set according to a set temperature.
By providing a mixed water having a desired hot water supply temperature by controlling the opening ratio of the above and providing an efficient hot water supply, by supplying the mixed water to a heating means equipped with a burner,
In the winter, etc., when the solar water heater 1 cannot obtain a sufficient temperature rise, a conventional hot water supply system is provided in which hot water heated by a burner and heated to a predetermined temperature is discharged.

As shown in FIG. 5, the electric mixing valve 36 has a warm water inflow passage 37 connected to the hot water passage, a cold water inflow passage 38 connected to the cold water passage, and a predetermined ratio of hot water to cold water (0. A mixed water outflow passage 39 for guiding the mixed water mixed at 100%) toward the currant 35 or the shower 33, a ball valve body (valve body) 43, a valve shaft 44, a motor 45, and a valve seat 46. ing.

The ball valve body 43 is formed in a spherical shape and has a substantially T-shaped valve body passage 40. The valve body passage 40 has the hot water inflow passage 37, the cold water inflow passage 38, and the mixed water outflow passage 39. Are formed so as to have corresponding openings. The ball valve body 43 is the motor 4
5 is configured to be rotatable via the valve shaft 44.
The ball valve body 43 is configured such that the mixing ratio of cold water and warm water becomes a desired ratio depending on the rotational position. That is, in the hot water fully open position, the cold water inflow passage 38
Is cut off, and only the hot water in the hot water inflow path 37 is mixed in the water outflow path 3
9, the hot water inflow passage 37 is shut off at the cold water fully open position, and only the cold water in the cold water inflow passage 38 is led to the mixed water outflow passage 39, and the warm water and the cold water in the hot water inflow passage 37 and the cold water inflow passage 38 are mixed at the intermediate position. It leads to the exit 39.

In the hot water supply device 2, when the hot water and the cold water are stopped while the hot water is being mixed, the hot water and cold water are prevented from flowing back and being contaminated. A check valve is provided in each of the cold water passages upstream of the cold water inflow passage 38. Further, in order to obtain hot water closer to the desired set temperature, a temperature detector is provided downstream of the electric mixing valve 36, and the detected temperature is fed back to control the rotational position (mixing ratio) of the ball valve body 43 and the burner. There is.

[0011]

However, in the structure shown in the above-mentioned conventional example, when the hot water of the solar water heater is not sufficiently heated as in the winter season and heating in the water heater is required, electric mixing is performed. Since the valve will be set to the hot water fully open position and the cold water passage will be shut off, the piping from the check valve of the cold water passage to the electric mixing valve will be completely sealed, and the hot water from the solar water heater will be electrically driven. Due to the heat received when passing through the mixing valve, the water in the closed state on the cold water passage side is warmed and the pressure in the pipe rises. The pressure at that time presses the valve seat on the cold water passage side toward the hot water passage side, which causes a problem that motor lock or piping water leakage is caused by an increase in sliding resistance. Furthermore, when hot water is stopped at the electric water mixing valve at the fully open position, the water pressure on the cold water passage side is higher than the water pressure on the hot water passage side.
A differential pressure is generated and the valve seat of the electric mixing valve is constantly pushed to the hot water passage side by the water pressure, and there is a problem of motor lock as above, and the friction of the valve seat is accelerated, and the valve body and the valve seat are promoted. There is a problem that the sealing property becomes poor.

Further, in the conventional electric mixing valve, hot water and cold water are mixed in a laminar flow state and introduced into the mixed water passage. In this way, the mixing state of the mixed water is not sufficient immediately after coming out of the electric mixing valve, so if a temperature detector is provided immediately after the electric mixing valve in order to downsize the water heater, it will be sufficiently mixed after that. There is a problem in that the temperature of the mixed water used as the temperature difference and the temperature detected by the temperature detector are different. Further, when the temperature detector is provided at a distance sufficiently away from the electric mixing valve so that sufficient mixing is performed, there is a problem in that there is a time difference between the operation of the electric mixing valve and the temperature detection, causing hunting.

[0013]

In order to solve the above problems, a water heater according to the first aspect of the present invention comprises a hot water passage for introducing hot water from a solar water heater and a cold water passage for introducing cold water from a tap water supply facility. An electric mixing valve that is connected to the hot water passage and the cold water passage and mixes the hot water and the cold water at a predetermined ratio; and a mixed water passage that is connected to the electric mixing valve and that guides the mixed water mixed by the electric mixing valve to the hot water utilization device. In the water heater comprising check valves arranged in each of the hot water passage and the cold water passage, and heating means arranged in an appropriate position of the mixed water passage to heat the mixed water, the electrically operated mixing valve is , A valve body rotatable about an axis, the valve body blocking the cold water passage at the hot water fully open position to guide the hot water in the hot water passage to the mixed water passage, and blocking the hot water passage at the cold water fully open position to cool water passage. Mixing cold water A valve body passage that guides the hot water and the cold water of the hot water passage and the cold water passage to the mixed water passage at the intermediate position, and a leak hole that guides a small amount of the cold water of the cold water passage to the valve body passage at the hot water fully open position. It is characterized by having.

According to the first aspect of the present invention, the pressure on the cold water passage side is made equal to the pressure on the hot water passage side by providing the leak hole which allows a very small amount of cold water to leak into the valve body passage at the hot water fully opened position. Since the load on the valve seat of the electric mixing valve is eliminated, the valve body can be smoothly slid and the sealing performance is improved.

A water heater according to a second aspect of the present invention is a hot water passage for introducing hot water from a solar water heater, a cold water passage for introducing cold water from a tap water supply facility, and the hot water and the cold water connected to the hot water passage and the cold water passage. And an electric mixing valve for mixing at a predetermined ratio, a mixing water passage that is connected to the electric mixing valve and guides mixed water mixed by the electric mixing valve to a hot water utilization device, and is arranged in each of the hot water passage and the cold water passage. A check valve, a heating means arranged at a proper position in the mixed water passage for heating the mixed water, a temperature detector arranged upstream of the heating means for detecting the temperature of the mixed water, and the temperature detection In a water heater provided with a controller for controlling the electric mixing valve and the heating means based on a detection value of a water heater, the electric mixing valve includes a valve element rotatable about an axis, and the valve element is Cold water flow in the hot water fully open position The hot water in the hot water passage to the valve body outflow water receiving portion of the mixed water outlet formed around the valve body of the electric mixing valve, and the hot water passage is shut off at the cold water fully open position to cool the cold water in the cold water passage. The valve body outflow water receiving portion has a valve body passage for guiding the hot water and the cold water in the warm water passage and the cold water passage to the valve body outflow water receiving portion at an intermediate position, and the valve body outflow water receiving portion serves as a mixed water passage. Is provided at a position on the opposite side of the valve body with respect to the connection portion, and the mixed water outlet passage reverses the mixed water from the valve body outflow water receiving portion along the periphery of the valve body to connect the connection portion. It is characterized in that it is formed so as to flow toward.

According to the second aspect of the present invention, the valve body outflow water receiving portion is provided at a position opposite to the connecting portion with the mixed water passage so as to sandwich the valve body. In order to guide the water to the outlet of the mixed water discharge path while making a half turn around the valve body (preferably a ball valve body),
The completely mixed mixed water will flow out to the mixed water passage.

Moreover, by providing the temperature detector between the valve body and the connecting portion and being supported by the housing of the electric mixing valve, the temperature of the mixed water in a state where the temperature distribution is uniform can be detected. , Accurate data can be obtained, and the whole structure can be made compact.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual diagram showing a hot water supply system that heats hot water by mixing hot water from a solar water heater and cold water from a water pipe, and FIG. 2 is a vertical sectional front view of an electric mixing valve.
FIG. 3 is a vertical plan view of the electric mixing valve.

In FIG. 1, 1 is a solar water heater, 2 is a water heater, a hot water connection port 3 for introducing hot water from the solar water heater 1, and cold water for introducing cold water from a water pipe (tap water supply facility) 8. In addition to having the connection port 4, a currant connection port 26a for supplying hot water to the currant (hot water using device) 26 is provided.

The water heater 2 has a hot water passage 18 connected to the hot water connection port 3 and a cold water passage 19 connected to the cold water connection port 4, and the check valves 5 and 6 are provided in the passages 18 and 19, respectively. Is provided. The water heater 2 has both passages 1
A motor-operated mixing valve 7 is provided which is connected to 8 and 19 and mixes hot water and cold water supplied from these with a predetermined ratio. The electric mixing valve 7 and the Karan connection port 26a are connected by a mixed water passage 25, and a heating means 9 for heating the mixed water is arranged at an appropriate position in the mixed water passage 25.

As shown in FIGS. 2 and 3, the electric mixing valve 7 includes a housing 11, a spherical ball valve body (valve body) 15, and a motor 10.

The housing 11 has a hot water inflow passage 18a connected to the hot water passage 18, a cold water inflow passage 19a connected to the cold water passage 19 and a connecting portion 4 for the mixed water passage 25.
7, a mixed water outflow passage 25a connected via a flow rate sensor 24 disposed in the valve 7, and a valve chamber 14 accommodating the ball valve body 15.
And have.

The hot water inflow passage 18a and the cold water inflow passage 1
As shown in FIG. 3, the valve chamber 9a and the valve chamber 9a are bent in an L shape, the valve chamber inflow portions are located on a straight line, and hot water and cold water are configured to flow from the left and right sides of the valve chamber 14, respectively. ing. The mixed water outflow passage 25a is the warm water inflow passage 1
8a and the cold water inflow passage 19a are connected to the valve chamber 14 so as to extend in a direction orthogonal to the direction of the valve chamber inflow portion, that is, rearward.

In the valve chamber 14, a ball valve body 15 is rotatably supported by a pair of left and right valve seats 16 and 17. The ball valve body 15 is configured to be positioned at an arbitrary rotational position in the horizontal direction by the motor 10 arranged above the ball valve body 15, so that the ball valve body 15 is engaged with the valve shaft 12 transmitting the drive of the motor 10 with a slight play. The valve chamber 14 is provided between the valve seats 16 and 17 and the housing 11.
Valve seat 1 due to the difference in water pressure while ensuring the seal of
O-ring 48 to allow slight movement of 6, 17
48 are provided. A ring-shaped mixed water outlet 20 is formed around the ball valve 15. As shown in FIG. 2, the mixed water outlet passage 20 is formed so as to go around the ball valve body 15 on the vertical plane, and the mixed water flowing out from the ball valve body 15 is moved to the left side of FIGS. 2 and 3. The valve body outflow water receiving portion 29 is formed so as to be inverted (half a circumference) along the circumference of the ball valve body 15 to be guided to the mixed water outflow passage 25a.

As shown in FIG. 3, the ball valve body 15 has an L-shaped valve body passage 13, and the surface of the ball body around the two openings is flat. That is, the ball valve body 15 has two flat plane portions 18b, 19b around the openings.
have. Depending on the rotational position of the ball valve body 15, the valve body passage 13 is provided with either the hot water inflow passage 18a or the cold water inflow passage 19a, or both, and the valve body outflow water receiving portion 29 of the mixed water discharge passage 20. While communicating, the mixing ratio (0-100%) of hot water and cold water is set to a predetermined ratio.

That is, the ball valve body 15 is shown in FIG.
At the hot water fully open position shown in FIG. 3, the cold water passage 19 is shut off and the hot water in the hot water passage 18 is guided to the valve body outflow receiving portion 29 of the mixed water discharge passage 20 of the electric mixing valve 7, so that the ball valve body 15 is moved to the position shown in FIG.
At the cold water fully open position which is rotated by 90 ° from the position shown in FIG. 5, the hot water passage 18 is shut off and the cold water in the cold water passage 19 is guided to the valve body outflow receiving portion 29, and the ball valve body 15 is placed between the warm water fully open position and the running water fully open position. The hot water and cold water in the hot water passage 18 and the cold water passage 19 are guided to the valve body outflow receiving portion 29 at the intermediate position in the rotating position. As shown in FIGS. 2 and 3, the valve body outflow receiving portion 29
Indicates a portion of the mixed water outlet 20 where the mixed water flows out from the ball valve body 15, and is provided at a position opposite to the connection portion 47 with the ball valve body 15 interposed therebetween.

Since the ball valve body 15 has the L-shaped valve body passage 13 having only two openings as described above, the hot water and the cold water at the intermediate position have a flat portion around the opening. 18b, 19b and valve seat 1
6 and 17, a part of the gap flows to the valve body outflow water receiving portion 29 from the gap (the mixing ratio is determined by the opening ratio of these gaps), and the rest flows through the respective openings into the valve body passage 1.
3, they collide with each other, are mixed with each other, and again flow into the valve body outflow receiving portion 29 through the original opening.
Since the mixed water reaches the valve body flowing water receiving portion 29 of the mixed water outlet 20 in the complicated flow as described above, the mixed state of the mixed water becomes good. Moreover, the mixed water changes its direction in the mixed water discharge passage 20 and is guided to the mixed water outflow passage 25a while making a half round around the ball valve body 15, so that the mixed water in a completely mixed state flows out to the mixed water passage 25. It will be.

As shown in FIG. 3, the ball valve body 15 has a leak hole 22 for guiding a small amount of cold water in the cold water passage 19 to the valve body passage 13 at the hot water fully opened position. Therefore, the pressure when hot water supply is stopped at the hot water fully opened position becomes the same on the cold water passage 19 side and the hot water passage 18 side, and the load on the valve seats 16 and 17 is eliminated. The problem that the internal pressure of the cold water passage 19 between the electric mixing valve 7 and the check valve 6 rises when only hot water is used can be solved by the pressure leak due to the leak hole 22, so the ball valve body 15
It is possible to smoothly rotate. The leak hole 22 has a size that does not affect the mixing ratio, for example, a diameter of 2 m.
It is preferably formed to have a diameter of 1 m
It is most suitable to form it to about m.

As shown in FIG. 2, in the water heater 2, a temperature detector 23 for detecting the temperature of the mixed water mixed by the electric mixing valve 7 is arranged in the mixed water outlet 25a, and the electric mixing valve 7 is provided. It is provided integrally with. Further, as shown in FIG. 2, the connection portion 47 is provided with a flow rate sensor 24 for detecting the flow rate of the mixed water. Further, as shown in FIG. 1, the hot water supply device 2 has a hot water outlet temperature detector 2 downstream of the heating means 9.
3a.

In FIG. 1, 27 is an operation switch 27.
a, temperature setting switch 27b, operation mode switch 27
c, bath automatic operation switch 27d, and liquid crystal display 27
Reference numeral 28 denotes a kitchen remote controller provided with e, and 28 is a controller for controlling the mixing ratio of the electric mixing valve 7, controlling the combustion of the burner 9a, and transmitting signals to and from the kitchen remote controller 27. Operation mode switch 2 provided on the kitchen remote controller 27
By selecting a desired hot water supply mode with 7c, it is possible to control the electric mixing valve 7 and switch the water supply path of the water heater 2.

Next, the operation will be described. First, the operation switch 27a of the kitchen remote controller 27 is turned on, and the operation mode switch 27c selects the operation mode. The operation modes are "first operation mode" (no heating means used), "second operation mode" (total use of all means), and "third operation mode".
It is possible to select three modes (using only tap water),
The selected operation mode is displayed on the liquid crystal display 27e.

First, when the "third operation mode" is selected,
The electric mixing valve 7 moves to the cold water passage 19 side to be in the cold water fully open position. Then, when the hot water supply scallop 26 is opened and hot water is supplied in this state, the cold water from the water pipe 8 is cooled by the cold water connection port 4,
It is supplied to the mixed water passage 25 through the cold water passage 19 and the electric mixing valve 7, and the heating means 9 receives the signals from the flow rate sensor 24 and the temperature detector 23 to burn from the burner 9a set to a predetermined burnup. It receives heat and is heated, and hot water of the set temperature of the remote control device 27 is supplied from the currant 26.
The hot water outlet temperature detector 23a is provided to correct the deviation of the hot water temperature as a result of heating from the set temperature and to control the hot water supply temperature more accurately.

Next, the operation when the hot water supply mode switch 27c is operated to switch the operation mode to the "first operation mode" or the "second operation mode" will be described.

When switching to the "first operation mode", first,
The electric mixing valve 7 is switched to the hot water passage 18 side, and the combustion of the burner 9a is maintained in the OFF state. And hot water supply curran 26
When is opened, the temperature detector 23 detects the temperature of the hot water from the solar water heater 1 and compares it with the set temperature. If the temperature of the hot water is high, the electric mixing valve 7 is rotated to the intermediate position to mix the hot water with the cold water from the water pipe 8, and the temperature of the mixed water detected by the temperature detector 23 becomes the set temperature. To control the mixing ratio. Therefore, if the temperature of the hot water of the solar water heater 1 is sufficiently raised in the summer, the hot water as it is,
Alternatively, it can be mixed with cold water and used from the hot water supply calan 26.

In the "first operation mode", when the temperature of the hot water of the solar water heater 1 is lower than the set temperature, the electric mixing valve 7 is in the hot water fully open position and the cold water side is closed. In this state, there was a problem that the rotation resistance of the ball valve body 15 became large, but in the present embodiment, since the ball valve body 15 is provided with the leak holes 22 having a minute diameter, the cold water passage is provided. Leak the internal pressure of 19 to eliminate the differential pressure between the hot water passage 18 side and the cold water passage 19 side,
As a result, the problems of the above-described conventional example can be solved, and smooth rotation of the ball valve body 15 can be ensured.

Further, when the temperature of the hot water is higher than the set temperature, the electric mixing valve 7 is controlled to mix the hot water and the cold water so as to reach the set temperature. Since it is provided around the ball valve body 15, completely mixed water can be obtained, so that the temperature can be accurately detected by the temperature detector 23 and the above-mentioned control can be performed. Moreover, even if the temperature detector 23 is provided in the mixed water outflow passage 25a of the electric mixing valve 7, it is possible to detect the temperature of the mixed water in a state where the temperature distribution is uniform, accurate data can be obtained, and the entire structure can be obtained. Can be made compact. Further, even if the flow rate sensor 24 is provided in the connecting portion 47, the flow rate can be detected in a state where the flow rate distribution is uniform, and accurate flow rate data can be obtained, like the temperature detector 23.

Next, when the mode is switched to the "second operation mode", first, the electric mixing valve 7 is switched to the full-open side on the hot water side, and the hot water supply run 2
When 6 is opened, the temperature detector 23 detects the temperature of the hot water from the solar water heater 1 and compares it with the set temperature. And
If the detected temperature is high, the electric mixing valve 7 is rotated to an intermediate position to mix the hot water and the cold water from the water pipe 8 and the mixing ratio is controlled so that the temperature of the mixed water becomes the set temperature. On the other hand, if the detected temperature is lower than the set temperature, the electric mixing valve 7 is set to the fully opened position on the hot water side to supply the mixed water to the mixed water passage 25, and the burner 9a of the heating means 9 is started to burn, so that the outlet heated water temperature detector 23a. The amount of combustion of the burner 9a is controlled so that the temperature detected by the mixed water detected in step 1 will be the set temperature.

At this time, when the hot water side fully open position is set,
Similar to the above “first operation mode”, the ball valve body 15
There was a problem that the rotation resistance of the
Since the structure in which the ball valve body 15 is provided with 2 is provided, smooth rotation of the ball valve body 15 can be ensured.

Also, when the electric mixing valve 7 is rotated to the intermediate position to mix the hot water and the cold water, it is possible to obtain the mixed water at the accurate temperature as in the case of the "first operation mode". It is possible to stabilize the water entry conditions of the water heater 2 and to accurately control the combustion amount of the burner 9a, and it is possible to provide stable hot water from the hot water heater 26.

[0040]

According to the present invention, it is possible to ensure smooth turning and sealing of the valve body of the electromagnetic mixing valve. Further, according to the present invention, it is possible to provide a water heater capable of measuring the water temperature of sufficiently mixed water.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a hot water supply system for heating mixed water of hot water from a solar water heater and cold water from a water pipe to supply hot water according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional front view of the electric mixing valve of the present embodiment.

FIG. 3 is a vertical cross-sectional plan view of the electric mixing valve of the present embodiment.

FIG. 4 is a schematic diagram showing a hot water supply system using a water heater according to a conventional example.

FIG. 5 is a sectional view of a conventional electric mixing valve.

[Explanation of symbols]

1 solar water heater 2 water heater 5, 6 Check valve 7 Electric mixing valve 8 water pipes (tap water supply equipment) 9 Heating means 11 housing 13 Valve passage 15 Ball valve body (valve body) 18 Hot water passage 19 Cold water passage 20 Mixed water outlet 22 Leak hole 23 Temperature detector 25 mixed water passage 28 Controller 29 Valve body outflow water receiver 47 Connection

Continued front page    (72) Inventor Hiroshi Mihara             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Yoshihisa Urakawa             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Masafumi Hashimoto             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Toshihiro Horiuchi             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Eiji Komiya             Chubu Energy, Inouyama City, Aichi Prefecture             Su Co., Ltd. (72) Inventor Takashi Sasaki             Chubu Energy, Inouyama City, Aichi Prefecture             Su Co., Ltd. F term (reference) 3H067 AA12 AA24 AA38 CC07 CC45                       DD03 DD32 EA01 EA12 ED10                       FF03 GG13

Claims (5)

[Claims] 1. A hot water passage for introducing hot water from a solar water heater, a cold water passage for introducing cold water from a water supply facility, and a hot water passage and a cold water passage connected to mix the hot water and the cold water at a predetermined ratio. An electric mixing valve, a mixing water passage that is connected to the electric mixing valve and guides the mixed water mixed by the electric mixing valve to a hot water utilization device, and a check valve arranged in each of the hot water passage and the cold water passage, In a water heater provided with a heating means for heating the mixed water, which is arranged at a proper position in the mixed water passage, the electric mixing valve includes a valve body rotatable about an axis, and the valve body has a hot water fully opened position. In the above, the cold water passage is shut off and the hot water in the hot water passage is guided to the mixed water passage, the hot water passage is shut in the cold water fully open position to guide the cold water in the cold water passage to the mixed water passage, and the hot water passage and the hot water passage in the cold water passage are held in the intermediate position. A valve body passage for guiding the fine cold water mixed water passage and water heater characterized by having a leak hole for guiding the cold water cold water passage small amount the valve body passage at the hot water fully open position. 2. The water heater according to claim 1, wherein the valve body is a ball valve body. 3. A hot water passage for introducing hot water from a solar water heater, a cold water passage for introducing cold water from a water supply facility, and a hot water passage and a cold water passage connected to mix the hot water and the cold water at a predetermined ratio. An electric mixing valve, a mixing water passage that is connected to the electric mixing valve and guides the mixed water mixed by the electric mixing valve to a hot water utilization device, and a check valve arranged in each of the hot water passage and the cold water passage, Based on the detection value of the heating means which is arranged at a proper position of the mixed water passage to heat the mixed water, the temperature detector which is arranged on the upstream side of the heating means to detect the temperature of the mixed water, and the temperature detector. In the water heater including the electric mixing valve and a controller that controls the heating means, the electric mixing valve includes a valve body rotatable about an axis, and the valve body is provided with a cold water passage at a hot water fully open position. Shut off the hot water Of the hot water of the electric mixing valve to the valve body outflow water receiving portion of the mixed water outlet formed around the valve body of the electric mixing valve, and the hot water passage is shut off at the cold water fully open position to cool the cold water of the valve water outlet receiving portion. And has a valve body passageway that guides hot water and cold water of a hot water passageway and a cold water passageway to the valve body outflow water receiving portion at an intermediate position, and the valve body outflow water receiving portion is connected to a connection portion with a mixed water passageway. It is provided at the opposite side of the valve body, and the mixed water outlet passage is formed so as to invert the mixed water from the valve body outflow water receiving portion along the circumference of the valve body and flow toward the connecting portion. A water heater characterized by being used. 4. The valve body comprises a ball valve body,
The water heater according to claim 3, wherein the ball valve body has a substantially L-shaped valve body passage. 5. The water heater according to claim 3, wherein the temperature detector is supported by the housing of the electric mixing valve between the valve body and the connecting portion.