JP2014134242A - Hot water/water mixing device and water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water/water mixing device and a water heater improved in mixability of hot water and water.SOLUTION: A hot water path outlet and a water path outlet to connect a bypass path 13 for supplying water and a hot water inlet pipe 8 for supplying hot water to a mixing chamber 28, are respectively provided with drift walls 29, 30, and the hot water and water flowing into the mixing chamber 28 from the hot water path outlet and the water path outlet are directed toward the water path outlet and the hot water path outlet. Thus the hot water and the water collide with each other in the mixing chamber 28 to enhance the mixing of the hot water and the water, and mixability of the hot water and the water in a stage before passing through a proportional valve, is significantly improved.

Description

  The present invention relates to a hot water / water mixing device and a hot water heater, and more particularly to a hot water / water mixing device with improved mixing of hot water and water, and a water heater equipped with such a hot water / water mixing device.

  The water heater is equipped with a hot and cold water mixing device that mixes hot water and water into mixed water having a predetermined temperature and flow rate, and supplies the mixed water to a kitchen, a sink, a bath, and the like. The temperature of the hot water discharged from the water heater is measured by a hot water thermistor provided in a mixed water outlet pipe where hot water and water are mixed and discharged. The hot and cold water mixing device controls the mixing ratio and flow rate of hot water and water so that the temperature measured by the hot water thermistor becomes a set temperature.

  Since the tapping thermistor controls the tapping temperature based on the measured temperature, it is necessary to measure the temperature of the mixed water in which the hot water and water are sufficiently mixed. However, in an actual hot and cold water mixing device, hot water and water are simply mixed in a mixing chamber formed at a position where the hot water pipe and the water pipe intersect, and then, through a proportional valve that adjusts the flow rate, The mixed water is discharged. In the mixing room, hot water and water are often mixed in an incomplete state, and therefore the hot water thermistor may not be able to accurately measure the hot water temperature of the mixed water.

  In contrast to the fact that mixing with hot water and water is incomplete, measurement with a hot water thermistor is performed. Conventionally, the pipe on the downstream side of the proportional valve is lengthened until it reaches the hot water thermistor. To make it possible to mix as completely as possible.

  In addition, a stirring device is provided on the downstream side of the proportional valve, and here, the mixed water that has been mixed incompletely is stirred to discharge the mixed water in a more complete mixed state. (For example, refer to Patent Document 1).

JP 2003-35379 A (paragraphs [0015] to [0016], FIG. 3)

  However, when the distance from the mixing chamber where the hot water pipe and the water pipe cross to the stirrer via the proportional valve is short, the mixed water reaches the stirrer in an incompletely mixed state. There was a problem that stirring by was not sufficient. If the stirring is not sufficient, the measured temperature of the hot water will vary, making it difficult for the water heater to maintain the set hot water temperature. In addition, the variation in the measured temperature is a cause of increasing the control operation of the hot and cold water mixing device, and there is a concern about durability.

  This invention is made in view of such a point, and provides the hot-water mixing apparatus and water heater which can obtain more perfect mixing of hot water and water by the time it reaches the downstream of a proportional valve. Objective.

  In the present invention, in order to solve the above problems, a hot water path for introducing hot water, a water path for introducing water, a mixing chamber formed at a position where the hot water path and the water path are orthogonal to each other, and the mixing A hot water mixing apparatus comprising a hot water path and a hot water path extending in a direction orthogonal to the water path from a room, the hot water path formed at a water path outlet of the water path connected to the mixing room A first drift wall configured to partially close a side opposite to the side to which the hot water is connected and a side to which the hot water path is connected; and a hot water path outlet of the hot water path connected to the mixing chamber And a second drift wall that partially closes the side opposite to the side to which the water path is connected. The hot and cold mixing device is provided.

  Further, in the present invention, a hot water path for introducing hot water, a water path for introducing water, a mixing chamber formed at a position where the hot water path and the water path intersect at right angles, and the hot water path from the mixing room, A hot water path extending in a direction perpendicular to the water path, a side opposite to a side where the hot water path is connected to the side of the water path connected to the mixing chamber and the hot water path, and the hot water path A first drift wall configured to partially block a side to which the path is connected; a side formed with a hot water path outlet of the hot water path connected to the mixing chamber and the side to which the water path is connected; There is provided a hot water heater comprising a hot and cold water mixing device having a second drift wall configured to partially block the opposite side.

  According to such a hot water / water mixing device and a water heater, the hot water path connected to the mixing chamber and the hot water path outlet and the water path outlet of the water path are provided with the first drift wall and the second drift wall, and the mixing chamber is provided. The hot water and the water that enter are colliding with each other. Thereby, mixing of hot water and water in the mixing room is promoted, so that the mixing property of hot water and water is greatly improved.

  The hot and cold water mixing apparatus having the above-described configuration includes the first and second drift walls on the upstream side of the proportional valve that controls the flow rate of the mixed water of hot water and water, thereby greatly improving the mixing property. Variations in the temperature of the mixed water discharged from the hot water are suppressed, and the hot water supply temperature is stabilized. When the hot water temperature is stabilized and the hot water temperature measured by the hot water thermistor is stabilized, the hot water heater can be maintained at the set hot water temperature.

It is a system diagram which shows the structural example of the water heater of this invention. It is a perspective view which shows the external appearance of a hot-water mixing apparatus. It is sectional drawing which shows the structure of a distribution valve. It is AA arrow sectional drawing of FIG. 3 which shows the structure of a proportional valve. It is a BB arrow sectional view of Drawing 3 showing the composition of a proportional valve. It is a figure which shows the body seen from the proportional valve motor attachment surface side. It is C arrow line view of FIG. 6 which shows a body from the water outlet piping side. It is DD sectional view taken on the line of FIG. 3 which looked at the mixing room from the bypass route. It is the E arrow line view of FIG. 6 which shows the body seen from the hot water inlet piping side. It is FF arrow sectional drawing of FIG. 6 which shows the inside of a mixing chamber. It is a figure which shows the modification of the drift wall formed in the water path | route exit of a bypass path, Comprising: (A) is a figure which shows the 1st modification of a drift wall, (B) is the 2nd modification of a drift wall. (C) is a figure which shows the 3rd modification of a drift wall, (D) is a figure which shows the 4th modification of a drift wall.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a system diagram showing a configuration example of a water heater according to the present invention.
The water heater includes a heat exchanger 1 and a hot and cold mixing device 2. The hot water mixing device 2 includes a water supply inlet pipe 4 connected to the water supply water supply pipe 3, a water outlet pipe 6 (second water path) connected to the upstream pipe 5 of the heat exchanger 1, and the heat exchanger 1. A hot water inlet pipe 8 (hot water path) connected to the downstream side pipe 7 and a mixed water outlet pipe 10 (hot water path) connected to the hot water supply pipe 9 are provided. The water supply inlet pipe 4 is connected to the inlet of the distribution valve 12 via the flow sensor 11, the first outlet of the distribution valve 12 is connected to the water outlet pipe 6, and the second outlet of the distribution valve 12 is the bypass path 13. It is connected to the upstream side of the (water path). The downstream side of the bypass path 13 is joined to the hot water inlet pipe 8 and then connected to the upstream side of the proportional valve 14, and the downstream side of the proportional valve 14 is connected to the mixed water outlet pipe 10. The hot water supply pipe 9 connected to the mixed water outlet pipe 10 is branched in the middle and connected to, for example, a pipe for discharging hot water to a kitchen faucet or a pipe for discharging hot water to a bath.

  The water supply pipe 3 is provided with an incoming thermistor 15 for measuring the temperature of the water supply, and the downstream pipe 7 of the heat exchanger 1 is provided with a heat exchanger outlet thermistor 16 for measuring the heat exchanger outlet temperature. The hot water supply pipe 9 is provided with a hot water thermistor 17 for measuring the hot water temperature.

  In the water heater having the above configuration, the water supplied from the water supply pipe 3 passes through the flow sensor 11 and is supplied to the distribution valve 12. The distribution valve 12 controls the ratio of water distributed to the heat exchanger 1 and the bypass path 13. The water supplied to the heat exchanger 1 is heated into hot water and supplied to the hot water inlet pipe 8. The hot water supplied to the hot water inlet pipe 8 is mixed with the water supplied via the bypass path 13, the hot water flow rate is controlled by the proportional valve 14, and hot water is discharged from the mixed water outlet pipe 10. The distribution valve 12 and the proportional valve 14 are electric control valves, so that the hot water temperature becomes a set temperature by a control unit (not shown) based on the temperatures measured by the incoming water thermistor 15, the heat exchanger outlet thermistor 16, and the hot water thermistor 17. The distribution ratio and the valve opening are controlled.

  The hot and cold water mixing device 2 includes a flow sensor 11, a distribution valve 12, a bypass passage 13, and a proportional valve 14, which are integrated into one body. Next, the structure of the hot and cold mixing device 2 will be described in detail.

  2 is a perspective view showing the appearance of the hot and cold mixing device, FIG. 3 is a cross-sectional view showing the configuration of the distribution valve, FIG. 4 is a cross-sectional view taken along the line AA of FIG. 3 showing the configuration of the proportional valve, and FIG. FIG. 5 is a cross-sectional view taken along the line BB in FIG. 6 is a view showing the body as viewed from the proportional valve motor mounting surface side, FIG. 7 is a view from the direction of the arrow C in FIG. 6 showing the body from the water outlet pipe side, and FIG. 8 is a view of FIG. DD is a sectional view taken along the arrow D, FIG. 9 is a sectional view taken along the arrow E in FIG. 6 showing the body viewed from the hot water inlet piping side, and FIG. 10 is a sectional view taken along the arrow FF in FIG. .

  The hot and cold water mixing device 2 is configured by attaching a distribution valve motor 21 and a proportional valve motor 22 to a body 20. The body 20 discharges hot water into a water supply inlet pipe 4 that receives water from the water supply pipe 3, a water outlet pipe 6 that supplies water to the heat exchanger 1, a hot water inlet pipe 8 that receives hot water from the heat exchanger 1, and a hot water supply pipe 9. A mixed water outlet pipe 10 is provided. The water supply inlet pipe 4 and the water outlet pipe 6 are arranged such that their central axes are orthogonal to each other, and the valve body of the distribution valve 12 is arranged at a position orthogonal to the central axis. The central axes of the water outlet pipe 6, the hot water inlet pipe 8, and the mixed water outlet pipe 10 are also orthogonally arranged, and the valve body of the proportional valve 14 is arranged at a position orthogonal to these central axes.

  As shown in FIG. 3, the distribution valve 12 includes a valve body 23 disposed on the same axis as the central axis of the water supply inlet pipe 4, and a distribution valve motor 21 that rotationally drives the valve body 23. . The valve body 23 has a cylindrical shape, and an opening 24 through which water passes to the water outlet pipe 6 and an opening 25 through which water passes to the bypass path 13 are formed on the side surface. These openings 24 and 25 determine the distribution ratio between the amount of water flowing to the water outlet pipe 6 and the amount of water flowing to the bypass path 13 according to the rotational position of the valve body 23. In the illustrated example, the valve body 23 shows a rotational position in a state where the opening portion 24 is largely opened and a state where the opening portion 25 is slightly opened. As the valve body 23 rotates clockwise or counterclockwise from the illustrated rotational position, the size of the opening area of the opening 24 that communicates with the water outlet pipe 6 and the opening 25 that communicates with the bypass path 13 increases. It is formed in a shape that has characteristics that continuously change in opposite directions. That is, as the valve body 23 rotates, one of the openings 24 and 25 changes so that the opening area increases, and the other changes so that the opening area decreases. In this way, the water supplied from the water supply inlet pipe 4 enters the hollow portion of the valve body 23 and branches there, and one of the water flows into the water outlet pipe 6 through the opening 24 of the valve body 23, The other flows to the bypass path 13 through the opening 25 of the valve body 23.

  The water supply inlet pipe 4 is provided with a flow rate sensor 11. The flow sensor 11 includes a magnetic impeller 26 rotatably disposed in a water passage of the water supply inlet pipe 4 and a magnetic sensor 27 embedded in a cylindrical portion of the water supply inlet pipe 4. When water flows through the water supply inlet pipe 4, the flow sensor 11 rotates the impeller 26, detects the proximity of the rotating blades of the magnetic sensor 27, and outputs a pulse signal corresponding to the flow rate.

  The bypass path 13 is arranged so as to be orthogonal to the hot water inlet pipe 8, and a mixing chamber 28 for mixing hot water and water is formed at the connecting portion. The mixing chamber 28 is also a chamber in which the valve body of the proportional valve 14 is accommodated, but in FIG. 3, the valve body of the proportional valve 14 is omitted. A drift wall 29 (first drift wall) is formed at the water path outlet of the bypass path 13 connected to the mixing chamber 28, and a drift current flows at the hot water path outlet of the hot water inlet pipe 8 connected to the mixing chamber 28. A wall 30 (second drift wall) is formed. The drift wall 29 has the function of directing the flow of water entering the mixing chamber 28 from the bypass path 13 toward the outlet of the hot water path and hitting the hot water flow. The drift wall 30 has a function of directing the flow of hot water entering the mixing chamber 28 from the hot water inlet pipe 8 toward the outlet of the hot water path and hitting the water flow. In this way, the mixing property of hot water and water is greatly improved by creating a flow in which hot water and water collide with each other in the mixing chamber 28.

  As shown in FIGS. 4 and 5, the proportional valve 14 includes a valve body 31 disposed in a mixing chamber 28 at a position where the bypass path 13, the hot water inlet pipe 8, and the mixed water outlet pipe 10 intersect, and a mixing chamber. The valve seat 32 formed in the connection part of 28 and the mixed water exit piping 10 and the proportional valve motor 22 which raises / lowers the valve body 31 are provided. The mixed water outlet pipe 10 extends in a direction orthogonal to the bypass passage 13 and the hot water inlet pipe 8, and a valve rod 33 holding the valve element 31 extends on the same axis as the central axis of the mixed water outlet pipe 10. Has been issued. As shown in FIG. 5, the valve rod 33 is biased by a spring 34 in a direction in which the valve body 31 is seated on the valve seat 32, and is engaged with the gear 35 on the side opposite to the side where the valve body 31 is located. It has been stopped. The gear 35 is meshed with a worm 36 fixed to the motor output shaft on the outer periphery, and a cylindrical portion provided inside is meshed with a base portion 37 that holds the valve rod 33. As a result, when the gear 35 is rotated by the worm 36, it moves forward and backward in the axial direction of the valve rod 33, and this forward / backward movement is transmitted to the valve rod 33, so that the valve body 31 is moved to the valve seat 32. Move close to or away from it. That is, the valve opening degree of the proportional valve 14 is controlled, and the flow rate of hot water discharged from the mixed water outlet pipe 10 is controlled.

  Inside the mixed water outlet pipe 10 connected to the downstream side of the proportional valve 14, two walls 38 for stirring the mixed water at positions facing each other and shifted from each other in the mixed water flow direction. , 39 are formed. As shown in FIG. 5, the first wall 38 is formed to be inclined in the flow direction, thereby reducing the water flow resistance of the mixed water in the mixed water outlet pipe 10. As shown in FIG. 3, the second wall 39 is provided with a slit 40 in the center, thereby reducing the water flow resistance in the mixed water outlet pipe 10.

  Next, in the cross section of FIG. 3, the drift walls 29 and 30 that are formed at the connection portion between the bypass passage 13 and the mixing chamber 28 of the hot water inlet pipe 8 and have a function of improving the mixing property of hot water and water. explain.

  As shown in FIG. 6, the drift wall 29 is a view as seen from an arrow C of the body 20 to which the distribution valve motor 21 and the proportional valve motor 22 are not attached as viewed from the water outlet pipe 6 side. It can be seen in FIG. 7, which is a sectional view taken along the line DD. That is, the drift wall 29 closes the side opposite to the side where the mixed water outlet pipe 10 is connected and the side where the hot water inlet pipe 8 is connected at the water path outlet of the bypass path 13 connected to the mixing chamber 28. Are formed in a substantially semicircular shape. As a result, the opening 41 is formed on the side opposite to the side where the mixed water outlet pipe 10 is connected and the side where the hot water inlet pipe 8 is connected, so that the water entering the mixing chamber 28 from the bypass path 13 Directed to the side of the route exit. Further, at the outlet of the water path of the bypass path 13, the drift wall 29 is provided on the side where the mixed water outlet pipe 10 is connected, so that water entering the mixing chamber 28 from the bypass path 13 is directly directed toward the mixed water outlet pipe 10. It is blocking the flow. Thereby, the flow of water which does not contribute to mixing with hot water is prevented from being generated as much as possible. Furthermore, at the water path outlet of the bypass path 13, the water squeezed at the opening 41 is vigorously jetted into the mixing chamber 28 toward the hot water outlet path, so that mixing with hot water is further promoted. Is done.

  The drift wall 30 can be seen in the sectional view of FIG. 3 and in FIG. 9, which is a view taken from the side of the distributing valve motor mounting surface 42 and the hot water inlet pipe 8 in FIG. That is, the drift wall 30 has a side to which the bypass path 13 is connected so that the opening 43 is located on the side to which the bypass path 13 is connected at the hot water path outlet of the hot water inlet pipe 8 connected to the mixing chamber 28. Is formed in a circular shape on the opposite side. The drift wall 30 is not formed on the upstream side thereof at right angles to the inner wall of the bypass passage 13 like the drift wall 29, but as shown in FIG. It is formed in a taper shape so that the height from the inner wall gradually increases. Thereby, the hot water entering the mixing chamber 28 from the hot water inlet pipe 8 is directed to the water path outlet side of the bypass path 13 at the hot water path outlet.

  In the mixing chamber 28, as shown in FIG. 10, there is an opening 41 that opens to the hot water path outlet side and the side opposite to the mixed water outlet pipe 10 at the water path outlet of the bypass path 13. There is an opening 43 on the outlet side of the hot water path. For this reason, in the mixing chamber 28, the water directed to the hot water path outlet side and the hot water directed to the water path outlet side collide with each other, and the mixed water passes through the proportional valve 14. To the mixed water outlet pipe 10.

  As described above, the hot water / water mixing device 2 is configured to mix hot water and water in advance on the upstream side of the proportional valve 14 and supply the premixed water to the proportional valve 14. Thus, hot water and water are mixed to some extent when the premixed water that has passed through the proportional valve 14 reaches the walls 38 and 39 provided in the mixed water outlet pipe 10. And since the mixed water is stirred when passing through the walls 38 and 39, the mixed water supplied from the mixed water outlet pipe 10 to the hot water supply pipe 9 is a mixture of hot water and water reliably. Become.

  The mixed water discharged from the hot water mixing device 2 can obtain a stable hot water temperature by suppressing variations in temperature. Thereby, even if the hot water thermistor 17 is installed at a position close to the hot water mixing device 2, a stable measurement value can be obtained, so that the set hot water supply temperature can be maintained. Further, since the hot water thermistor 17 can be installed at a position close to the hot water / water mixing device 2, it is not necessary to lengthen the hot water supply pipe 9 up to the installation position of the hot water thermistor 17 in order to improve the mixing property of hot water and water. .

  In the above embodiment, the drift wall 29 formed at the water path outlet of the bypass path 13 has a substantially semicircular shape. However, in the present invention, the drift wall 29 has a substantially semicircular shape. It is not limited. Below, the modification of the drift wall 29 is demonstrated.

  FIG. 11 is a view showing a modification of the drift wall formed at the water path outlet of the bypass path, in which (A) shows a first modification of the drift wall, and (B) shows a second drift wall. The figure which shows the modification of (1), (C) is a figure which shows the 3rd modification of a drift wall, (D) is a figure which shows the 4th modification of a drift wall.

  In the first modification shown in FIG. 11A, the drift wall 29a formed at the water path outlet of the bypass path 13 is opposite to the side where the mixed water outlet pipe 10 is connected and the hot water inlet pipe 8. Is formed in such a shape that a circular opening 41a is located on the side to which the is connected. As a result, the drift wall 29a prevents water entering the mixing chamber 28 from the bypass path 13 through the opening 41a from flowing directly toward the mixed water outlet pipe 10 and toward the hot water path outlet side. Be able to.

  In the second modification shown in FIG. 11 (B), the drift wall 29b formed at the water path outlet of the bypass path 13 has hot water from the center position opposite to the side to which the mixed water outlet pipe 10 is connected. The opening 41b having a size of about one-fourth is formed on the side to which the inlet pipe 8 is connected. As a result, the drift wall 29b prevents water entering the mixing chamber 28 from the bypass path 13 via the opening 41b from flowing directly toward the mixed water outlet pipe 10 and toward the hot water path outlet side. Be able to.

  In the third modification shown in FIG. 11C, the drift wall 29 c formed at the water path outlet of the bypass path 13 is opposite to the side where the mixed water outlet pipe 10 is connected and the hot water inlet pipe 8. It is formed in a crescent shape such that an elliptical opening 41c having a pointed end is located on the side to which is connected. As a result, this drift wall 29c prevents water entering the mixing chamber 28 from the bypass path 13 through the opening 41c from flowing directly toward the mixed water outlet pipe 10 and toward the hot water path outlet side. Be able to.

  In the fourth modification shown in FIG. 11D, the drift wall 29d formed at the water path outlet of the bypass path 13 is opposite to the side where the mixed water outlet pipe 10 is connected and the hot water inlet pipe 8. Is formed in such a shape that an opening 41d having a non-circular shape is located on the side to which is connected. As a result, the drift wall 29a prevents water entering the mixing chamber 28 from the bypass path 13 through the opening 41d from flowing directly toward the mixed water outlet pipe 10 and toward the hot water path outlet side. Be able to.

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Hot and cold water mixing device 3 Water supply piping 4 Water supply inlet piping 5 Upstream piping 6 Water outlet piping (second water path)
7 Downstream piping 8 Hot water inlet piping (hot water path)
9 Hot water supply piping 10 Mixed water outlet piping (outflow route)
DESCRIPTION OF SYMBOLS 11 Flow sensor 12 Distribution valve 13 Bypass path 14 Proportional valve 15 Inlet thermistor 16 Heat exchanger exit thermistor 17 Hot water thermistor 20 Body 21 Distribution valve motor 22 Proportional valve motor 23 Valve body 24, 25 Opening 26 Impeller 27 Magnetic sensor 28 Mixing Room 29 drift wall (first drift wall)
29a drift wall 29b drift wall 29c drift wall 29d drift wall 30 drift wall (second drift wall)
DESCRIPTION OF SYMBOLS 31 Valve body 32 Valve seat 33 Valve stick 34 Spring 35 Gear 36 Worm 37 Base part 38,39 Wall 40 Slit 41 Opening part 41a Opening part 41b Opening part 41c Opening part 41d Opening part 42 Distribution valve motor mounting surface 43 Opening part

Claims (7)

A hot water path for introducing hot water, a water path for introducing water, a mixing chamber formed at a position where the hot water path and the water path intersect at right angles, and the hot water path and the water path from the mixing room orthogonal to each other In a hot and cold water mixing device provided with a hot water path extending in the direction,
The side that is formed at the water path outlet of the water path connected to the mixing chamber and that is opposite to the side to which the hot water path is connected and the side to which the hot water path is connected are partially blocked. A first drift wall;
A second drift wall formed at the hot water path outlet of the hot water path connected to the mixing chamber and partially blocking a side opposite to the side to which the water path is connected;
A hot and cold water mixing device characterized by comprising:   The first drift wall is formed in a substantially semicircular shape so as to partially close the outlet of the water path on the side opposite to the side where the hot water path is connected and the side where the hot water path is connected. The hot and cold water mixing apparatus according to claim 1, wherein   The second drift wall is formed in a circular shape so as to partially close the outlet of the hot water path on the side opposite to the side to which the water path is connected, and in the hot water flow direction. 2. The hot and cold water mixing device according to claim 1, wherein the hot water and water mixing device is tapered so that the height from the inner wall of the hot water path gradually increases.   A valve seat formed at a connecting portion between the mixing chamber and the hot water path, a valve body disposed in the mixing chamber, and a proportional valve that drives the valve body to approach or separate from the valve seat. The hot and cold water mixing device according to claim 1, further comprising a proportional valve having a motor.   The hot and cold water mixing apparatus according to claim 4, wherein a stirring wall is provided in the hot water supply path downstream of the proportional valve.   The hot and cold water mixing apparatus according to claim 1, further comprising a distribution valve that distributes the supplied water to the water path and a second water path that sends the water to an external heat exchanger.   A hot water path for introducing hot water, a water path for introducing water, a mixing chamber formed at a position where the hot water path and the water path intersect at right angles, and the hot water path and the water path from the mixing room orthogonal to each other A hot water supply path extended in the direction, a side formed on the water path outlet of the water path connected to the mixing chamber and the side opposite to the side to which the hot water path is connected, and the side to which the hot water supply path is connected A first drift wall that is partially closed, and a side opposite to the side where the water path is connected to the hot water path outlet of the hot water path connected to the mixing chamber. A hot water heater comprising a hot water and water mixing device having a second drift wall that is closed in a continuous manner.

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