JP6011280B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply apparatus, and more particularly to a hot water supply pipe assembled on the upper side of a hot water storage tank and a structure provided with a structure for preventing natural convection from occurring inside a hot water mixing valve.

  Conventionally, a hot water storage type hot water supply apparatus has a large capacity hot water storage tank for storing hot water, a water supply pipe connected to the lower part of the hot water storage tank, a hot water supply pipe connected to the upper part, and a heat source device from the lower part of the hot water storage tank. It has a circulating heating pipe that circulates and heats water to the upper part of the hot water storage tank. As the heat source device, a heat pump unit, an exhaust heat recovery heat exchanger of a fuel cell power generation unit, or the like is used.

  By the way, as a connection structure of the hot water supply pipe to the hot water storage tank, for example, in the water heater of Patent Document 1, a discharge port opened upward is provided at the center of the upper end portion of the hot water storage tank, and a T-shaped joint is provided at this discharge port. There is disclosed a structure in which a member is provided and a hot water supply pipe is connected to a hot water supply opening opened in the horizontal direction of the joint member to discharge hot hot water. A pressure relief valve is provided in the opening above the T-shaped joint member.

  In addition, in the upper part of the hot water storage tank, a hot water mixing valve for mixing high temperature water discharged from the upper part of the hot water storage tank and low temperature water having a temperature lower than the high hot water water may be provided in the middle of the hot water piping. is there. The hot water / water mixing valve mixes and adjusts the ratio of high temperature water and low temperature water to generate hot water having a desired temperature and supplies it from a hot water tap or the like. As the structure of this hot and cold water mixing valve, a mixing valve as disclosed in Patent Document 2 is generally widely adopted.

Japanese Patent Publication No. 7-35927 JP 2006-266403 A

  In the case of the structure of the discharge port of the hot water storage tank of Patent Document 1, the hot water piping is structured to be connected to the discharge port via a T-shaped joint member, and the hot water piping is assembled so that the upper side of the hot water storage tank extends horizontally. Will be attached. Similarly, the hot water mixing valve installed in the middle of the hot water piping is assembled in a horizontal state in which the opening direction of the inlet port for introducing hot water and the opening direction of the outlet port for discharging the mixed hot water are directed horizontally. There are many cases.

  However, if the outlet piping and hot water mixing valve are assembled so as to be horizontal on the upper side of the hot water storage tank, the hot water will stop at the moment when the hot water is stopped due to the difference in specific gravity between the low temperature water and the hot water inside the hot water piping and hot water mixing valve. Natural convection may occur, causing the temperature of the high-temperature water upstream of the outlet piping to decrease, the temperature of the low-temperature water downstream, or the low-temperature water to flow into the upper end of the hot water storage tank. . For this reason, there is a problem that a cold water sandwich phenomenon occurs when the hot water is discharged again, so that the hot water discharge characteristic is deteriorated.

  Therefore, in order to prevent natural convection from occurring inside the hot water piping and hot water mixing valve, it is necessary to assemble the hot water piping near the discharge port on the upper side of the hot water tank in a downwardly inclined manner in consideration of the specific gravity difference of hot water. However, in order to use the existing straight tubular piping to assemble the outlet piping downward and inclined, it is necessary to bend the outlet piping, which takes time and labor and increases the manufacturing cost. The piping structure on the upper side of the hot water storage tank may become complicated.

  An object of the present invention is to provide a hot water storage type hot water supply device capable of preventing the occurrence of natural convection inside the hot water supply piping and hot water mixing valve on the upper side of the hot water storage tank, and the hot water supply piping and hot water mixing valve can be provided at low cost and easily. Providing a hot water storage type hot water supply device that can be attached in a downwardly inclined manner with a simple configuration.

  The hot water storage type hot water supply apparatus according to claim 1 is configured to mix hot water discharged from an upper part of a hot water storage tank and low temperature water having a temperature lower than that of the high temperature water to discharge mixed hot water. In the hot water storage type hot water supply apparatus provided with hot water mixing means capable of adjusting the mixing ratio of the high temperature water and the low temperature water through a valve body that moves forward and backward in the axial direction in the case body, the hot water mixing means Is provided in the vicinity of one end portion in the axial direction of the case body and capable of introducing the high temperature water, and is provided in the vicinity of the other end portion in the axial direction of the case body and the low temperature water. A second introduction port that can be introduced; and a lead-out port that is provided in the middle of the case body in the axial direction and that discharges the mixed hot water. The lead-out port is orthogonal to the axial direction of the case body. The case body so that it opens in the direction. Is the hot and cold water mixing device is characterized in that the outlet together with the first inlet port is set at a position higher than the second inlet port are assembled so as to face diagonally downward.

  A hot water storage type hot water supply apparatus according to a second aspect is the invention according to the first aspect, wherein an upper end portion of the hot water storage tank is constituted by a dome-shaped end plate, and is spaced from the center of the end plate in a radial direction on the surface of the end plate. A discharge port that opens in a direction orthogonal to the discharge port and discharges the high-temperature water is provided, the discharge port is connected to the first introduction port, and the hot and cold mixing means includes the opening direction of the discharge port and the case It is characterized by being assembled so that the axis of the main body is orthogonal.

  According to the first aspect of the present invention, the outlet of the hot water mixing means is provided in the case body so as to open in a direction orthogonal to the axial direction of the case main body, and the hot water mixing means is the first introduction on the high temperature water side. Since the mouth is set at a position higher than the second introduction port on the low temperature water side and the outlet port is assembled so as to face obliquely downward, the hot water mixing means can be assembled in a downwardly inclined manner. The structure can suppress the occurrence of natural convection, so that the mixed hot water in the hot water mixing means is prevented from flowing back to the hot water storage tank side, and the hot water mixed from the outlet of the hot water mixing means is hot water. Since it is possible to prevent the flow back to the mixing means side, the tapping characteristics can be improved. Further, when the case body is rotated with the pipe extending from the hot water storage tank connected to the first introduction port, the outlet port faces obliquely downward, so that the hot water mixing means can be assembled in a downward inclined manner by a simple operation.

  According to invention of Claim 2, the discharge port which opens in the direction orthogonal to the surface of a mirror plate and discharges high temperature water in the position spaced apart in the radial direction from the center part of the dome-shaped mirror plate of a hot water storage tank is provided. Since the hot water mixing means is assembled so that the opening direction of the discharge port and the axis of the case body are orthogonal to each other, the existing straight tubular pipe is connected to the discharge port and the outlet port as a hot water supply pipe. Can be assembled in a downward inclined manner. Accordingly, since straight pipes are not required to be bent, pipes in the vicinity of the discharge port of the hot water storage tank and pipes in the vicinity of the hot water mixing means can be provided in a downward inclined manner with a simple configuration and at low cost.

It is a schematic block diagram of the hot water storage type hot water supply apparatus which concerns on an Example. It is a top view of a hot water storage tank. FIG. 3 is a view as seen from an arrow A in FIG. 2. FIG. 3 is a view taken in the direction of arrow B in FIG. 2. It is sectional drawing of a hot water piping, a high temperature side hot water mixing valve, and a low temperature side hot water mixing valve. It is sectional drawing of the hot water piping which concerns on a partial change form, a high temperature side hot water mixing valve, and a low temperature side hot water mixing valve.

  Hereinafter, modes for carrying out the present invention will be described based on examples.

First, the overall configuration of the hot water storage type hot water supply apparatus 1 will be described.
As shown in FIG. 1, the hot water storage type hot water supply apparatus 1 has functions such as hot water storage and hot water supply. The hot water storage tank 5, the water supply pipe 6, the hot water supply pipe 7 and the lower part of the hot water storage tank 5 pass through the external heat source unit 2. A circulating heating circuit 8 that circulates and heats water to the upper part of the hot water storage tank 5, a high-temperature side hot / cold water mixing valve 21, a low-temperature side hot / cold water mixing valve 22, and an exterior case 10 (see FIG. 2) for storing them. The hot water discharged from the upper part of the hot water storage tank 5 and the low temperature water having a temperature lower than that of the high temperature water are mixed to discharge the mixed hot water. As the external heat source unit 2, a heat pump type heat source unit, an exhaust heat recovery heat exchanger of a fuel cell power generation unit, or the like is used.

  The hot water storage tank 5 is composed of a vertically long and narrow closed tank capable of storing high-temperature hot water (for example, 80 to 90 ° C.) heated by the external heat source unit 2, and is arranged around the tank to prevent heat dissipation of the stored hot water. Is covered with insulation. The temperature of the hot water in the plurality of reservoirs in the hot water storage tank 5 is detected by the plurality of hot water temperature sensors 11a to 11e.

  As shown in FIGS. 1 to 4, the hot water storage tank 5 has a vertically long cylindrical outer peripheral surface and is made of a stainless steel body member 5 a excellent in corrosion resistance, and covers both upper and lower ends of the body member 5 a. A pair of dome-shaped end plates 5b and 5c are integrally formed.

  A discharge port 12 to which the upstream end of the hot water supply pipe 7 is connected and a circulation return side connection port 13 to which the downstream end of the circulation heating circuit 8 is connected are formed on the end plate 5 b at the upper end portion of the hot water storage tank 5. A water supply port 14 to which the downstream end of the water supply pipe 6 is connected and a circulation forward side connection port 15 to which the upstream end of the circulation heating circuit 8 is connected are formed on the end plate 5 c at the lower end portion of the hot water storage tank 5. Yes. The piping structure on the upper side of the hot water storage tank 5 will be described later.

  The water supply pipe 6 supplies low temperature clean water from a clean water source to the hot water storage tank 5, and an upstream end is connected to the clean water source and a downstream end is connected to a lower part of the hot water storage tank 5. The water supply pipe 6 is provided with an open / close valve 16 for supplying clean water to the hot water storage tank 5. Normally, the open / close valve 16 is opened so that hot water is supplied into the hot water storage tank 5. It has become.

  The hot water supply pipe 7 supplies hot water stored in the hot water storage tank 5 to a desired hot water supply destination such as a hot water tap 17, etc., and an upper outlet hot water pipe 7 a through which high temperature hot water flows, high temperature hot water and medium temperature hot water. There is an intermediate outlet pipe 7b through which mixed hot water flows and a lower outlet hot water pipe 7c through which mixed hot water mixed with mixed hot water flows, and a hot water tap 17 is connected to the downstream end of the lower outlet hot water pipe 7c. .

  As shown in FIGS. 1 to 5, a high temperature side hot water / water mixing valve 21 is installed between the upper outlet hot water pipe 7 a and the intermediate hot water piping 7 b, and the high temperature side hot water / water mixing valve 21 is connected to the hot water storage tank 5 from the middle stage. A downstream end of the extending medium temperature hot water pipe 18 is connected. A low temperature side hot water / water mixing valve 22 is installed between the intermediate hot water piping 7b and the lower outlet water piping 7c, and a downstream end of the bypass passage 19 branched from the water supply pipe 6 is connected to the low temperature side hot water / water mixing valve 22. .

  The circulation heating circuit 8 is a closed circuit that circulates hot water between the external heat source device 2 and the hot water storage tank 5, and has a forward side passage 8 a and a return side passage 8 b, and a forward side passage 8 a at the lower part of the hot water storage tank 5. The upstream end of the hot water storage tank 5 is connected to the upstream end of the return side passage 8b. A circulation pump 8c is installed in the outward passage 8a.

Next, the structure of the high temperature side hot / cold water mixing valve 21 will be described.
As shown in FIG. 5, the high-temperature side hot / cold water mixing valve 21 (corresponding to hot water / water mixing means) includes a case main body 23 configured in a substantially cylindrical shape, a mixing chamber 24 inside the case main body 23, and the inside of the mixing chamber 24. A valve shaft 25 that penetrates, a drive motor 26 that drives the valve shaft 25 to advance and retreat, a valve body 27 that is provided on the valve shaft 25 and moves forward and backward in the direction of the axis 23A in the case body 23, and Corresponding valve seats 28a, 28b, a first introduction port 31A provided in the vicinity of one end of the case body 23 in the direction of the axis 23A, and a second introduction provided in the vicinity of the other end of the case body 23 in the direction of the axis 23A. A port 32A, a lead-out port 33A provided in the middle of the case main body 23 in the direction of the axis 23A, and the like are provided.

  More specifically, with respect to the first introduction port 31A, the second introduction port 32A, and the outlet port 33A, the first introduction port 31A is the end opposite to the drive motor 26 and is parallel to the direction of the axis 23A. The case body 23 is provided so as to open. The second introduction port 32A is provided in the case body 23 so as to open in the direction near the end on the drive motor 26 side and in the direction orthogonal to the direction of the axis 23A. The lead-out port 33A is provided so as to open in a direction orthogonal to the direction of the axis 23A of the case body 23 and on the side opposite to the second introduction port 32A.

  As shown in FIG. 5, in the high temperature side hot / cold water mixing valve 21, hot hot water in the upper part of the hot water storage tank 5 is introduced as high temperature water into the first introduction port 31A to which the upper effluent hot water pipe 7a is connected. 18 is connected to the second introduction port 32A connected to the middle temperature portion of the hot water storage tank 5 as low temperature water, and the mixed hot water whose mixing ratio is adjusted in the mixing chamber 24 via the valve body 27 is led out to the outlet port 33A. It is comprised so that it may discharge to the intermediate hot water piping 7b.

Next, the structure of the low temperature side hot / cold water mixing valve 22 will be described.
As shown in FIG. 5, the low temperature side hot and cold water mixing valve 22 (corresponding to the hot and cold water mixing means) has basically the same structure as the high temperature side hot and cold water mixing valve 21, and includes a case body 23, a mixing chamber 24, a valve shaft. 25, the drive motor 26, the valve body 27, the valve seats 28a and 28b, the first introduction port 31B provided in the vicinity of one end of the case body 23 on the opposite side to the drive motor 26 in the axial center 23B direction, A second introduction port 32B provided in the vicinity of the other end portion on the drive motor 26 side in the direction of the shaft center 23B, provided in the middle part of the case body 23 in the direction of the axis 23B, and opened on the opposite side to the second introduction port 32B. The outlet 33B and the like are provided.

  As shown in FIG. 5, the low temperature side hot water / water mixing valve 22 is connected with the bypass passage 19 by introducing the mixed hot water of the high temperature side hot water / water mixing valve 21 as high temperature water into the first introduction port 31 </ b> B to which the intermediate tap pipe 7 b is connected. Low temperature clean water from a clean water source is introduced into the second introduction port 32B as low temperature water, and mixed hot water whose mixing ratio is adjusted in the mixing chamber 24 via the valve body 27 is discharged from the discharge port 33B to the bottom outflow hot water pipe 7c. It is comprised so that it may discharge.

  The hot water supply operation of the hot water storage type hot water supply device 1 is started together with the opening of the hot water tap 17. In the hot water storage type hot water supply apparatus 1, when hot water enters the lower part of the hot water storage tank 5 from the water supply pipe 6 due to the water pressure of the water supply source, and when hot hot water and medium temperature hot water are mixed, The hot water is pushed out from the upper part of the tank 5 to the upper outlet hot water pipe 7a, and the hot water of medium temperature is pushed out from the middle part of the hot water storage tank 5 to the hot water hot water pipe 18. The hot water thus pushed out is introduced into the hot water mixing valve 21. Is done.

  Next, the mixed hot water mixed by the high temperature side hot water mixing valve 21 is introduced into the low temperature side hot water mixing valve 22, and the clean water is introduced into the low temperature side hot water mixing valve 22 through the bypass passage 19. The flow rate ratio of the high temperature hot water mixed through the high temperature side hot water mixing valve 21 and the medium temperature hot water is controlled so that the tapping temperature becomes the command temperature, and the mixed hot water mixed through the low temperature side hot water mixing valve 22 is controlled. And the water flow ratio are respectively controlled. Note that only the high temperature side hot / cold water mixing valve 21 may be operated to generate mixed hot water, or only the low temperature side hot water / water mixing valve 22 may be controlled to generate mixed hot water. .

Next, the attachment structure of the hot water piping 7, the high temperature side hot / cold water mixing valve 21 and the low temperature side hot / cold water mixing valve 22 on the end plate 5 b at the upper end portion of the hot water storage tank 5 will be described.
As shown in FIGS. 2-4, the discharge port 12 which discharges the hot hot water of the hot water storage tank 5 opens in the direction orthogonal to the surface of the end plate 5b at a position spaced radially from the center of the end plate 5b. It is provided to do. That is, the discharge port 12 is opened in a direction perpendicular to the tangent line 35 with the discharge port 12 as a contact (see FIG. 4).

  The discharge port 12 is provided with an L-shaped joint member 12a. One end of the joint member 12a is connected to the discharge port 12, and the other end is opened in a direction parallel to the tangent 35 and downward in the inclined direction. The upstream end of the pipe 7a is connected. The upper effluent hot water pipe 7 a extends straight in a downward inclined manner, and its downstream end is connected to the first inlet 31 </ b> A of the high temperature side hot water / water mixing valve 21.

  The discharge port 12 is connected to the first introduction port 31A of the high temperature side hot / cold water mixing valve 21 via the joint member 12a and the upper outlet hot water pipe 7a, and the high temperature side hot water / water mixing valve 21 is connected to the opening direction of the discharge port 12 (FIG. 4). The direction indicated by the arrow a) and the axis 23A of the case main body 23 are assembled so as to be orthogonal to each other. That is, the high temperature side hot and cold water mixing valve 21 is set such that the first introduction port 31A is higher than the second introduction port 32A. Furthermore, the high temperature side hot / cold water mixing valve 21 is assembled so that the outlet port 33A faces obliquely downward (see FIGS. 3 and 4). The downstream end of the medium temperature hot water pipe 18 is connected to the second introduction port 32 </ b> A of the high temperature side hot water mixing valve 21.

  As shown in FIGS. 3 and 4, the outlet 33A of the high temperature side hot and cold water mixing valve 21 is connected to the upstream end of the intermediate hot water piping 7b. The end is connected to the first inlet 31 </ b> B of the low temperature side hot / cold water mixing valve 22. That is, the first inlet 31 </ b> B of the low temperature side hot / cold water mixing valve 22 is coaxially connected to the outlet 33 </ b> A of the high temperature side hot / cold water mixing valve 21.

  The low temperature side hot water / water mixing valve 22 is continuously connected to the high temperature side hot water / water mixing valve 21 via the intermediate hot water piping 7b, and the low temperature side hot water / water mixing valve 22 is connected to the shaft 23B of the case body 23 and the high temperature side hot water / water mixing valve. The shaft center 23A is assembled so as to be orthogonal to each other. That is, the low temperature side hot and cold water mixing valve 22 is set such that the first introduction port 31B is higher than the second introduction port 32B. Furthermore, the low temperature side hot / cold water mixing valve 22 is assembled so that the outlet 33B faces obliquely downward (see FIGS. 3 and 4). The downstream end of the bypass passage 19 is connected to the second introduction port 32B, and the upstream end of the lower outlet hot water pipe 7c is connected to the outlet port 33B.

Next, the operation and effect of the hot water storage type hot water supply apparatus 1 of the present invention will be described.
When assembling the outlet pipe 7, the high temperature side hot / cold water mixing valve 21, and the low temperature side hot / cold water mixing valve 22 on the upper end of the end plate 5 b at the upper end portion of the hot water storage tank 5, first, an L-shaped joint provided at the discharge port 12. A straight tubular upper effluent pipe 7a of the outlet hot water pipe 7 is connected to the member 12a, and the first inlet 31A of the high temperature side hot and cold water mixing valve 21 is connected to the downward inclined upper effluent pipe 7a. In this state, the high temperature side hot and cold water mixing valve 21 is rotated around the axis 23A of the case body 23 as an axis, so that the outlet 33A is adjusted to face obliquely downward, and the high temperature side hot and cold water mixing valve 21 is in a downward inclined posture. And attach. Next, the intermediate temperature hot water pipe 18 is connected to the second introduction port 32 </ b> A of the high temperature side hot water mixing valve 21.

  Next, a straight tubular intermediate hot water supply pipe 7b is connected to the outlet 33A opened obliquely below the high temperature side hot water / water mixing valve 21, and a first low temperature side hot water / water mixing valve 22 is connected to the downward inclined intermediate hot water supply pipe 7b. Connect the inlet 31B. In this state, the low temperature side hot and cold water mixing valve 22 is rotated about the axis 23B of the case body 23 as an axis, so that the outlet 33B is adjusted to be inclined downward, and the low temperature side hot and cold water mixing valve 22 is in a downward inclined posture. Install. Next, the bypass passage 19 is connected to the second introduction port 32B of the low temperature side hot water mixing valve 22, and the lower outlet hot water passage 7c is connected to the outlet port 33B opened obliquely below the low temperature side hot water mixing valve 22. .

  In this way, the arrangement relationship among the tapping pipe 7, the high temperature side hot / cold water mixing valve 21, and the low temperature side hot / cold water mixing valve 22 is such that the upper outlet hot water pipe 7 a and the high temperature side hot water / water mixing are arranged in order from the higher side to the lower side. A first inlet 31A through which high-temperature hot water of the valve 21 is introduced; a outlet 33A through which mixed hot water having an intermediate temperature between high-temperature hot water and medium-temperature hot water is led out; a second inlet 32A through which medium-temperature hot water is introduced; The intermediate hot water supply pipe 7b of the hot water supply pipe 7, the first introduction port 31B into which the mixed hot water of the intermediate temperature of the low temperature side hot water mixing valve 22 is introduced, and the mixed hot water conditioned by the mixed hot water of the intermediate temperature and the low temperature hot water. The outlet 33B to be led out and the second inlet 32B into which low temperature clean water is introduced, and a descending temperature gradient is formed from the upstream side to the downstream side. Of natural convection due to hot and cold water staying in water It is prevented.

  As described above, the outlets 33A and 33B of the high temperature side hot and cold water mixing valve 21 and the low temperature side hot and cold water mixing valve 22 are formed in the case main body 23 so as to open in a direction orthogonal to the direction of the axial centers 23A and 23B of the case main body 23. The high temperature side hot and cold water mixing valve 21 and the low temperature side hot and cold water mixing valve 22 are set such that the first introduction ports 31A and 31B on the high temperature water side are higher than the second introduction ports 32A and 32B on the low temperature water side. The outlets 33A and 33B are assembled so as to face obliquely downward.

  Therefore, by assembling the high temperature side hot and cold water mixing valve 21 and the low temperature side hot and cold water mixing valve 22 in a downwardly inclined manner, it is possible to suppress the occurrence of natural convection with a simple configuration. The mixed hot water discharged from the outlets 33A and 33B of the high temperature side hot water mixing valve 21 and the low temperature side hot water mixing valve 22 is prevented from flowing back to the hot water storage tank 5 side. Since the reverse flow can be prevented, the hot water discharge characteristics can be improved. In addition, when the case body 23 is rotated with the pipes extending from the hot water storage tank 5 connected to the first introduction ports 31A and 31B, the outlet ports 33A and 33B are directed obliquely downward, so that the high temperature side hot water mixing valve 21 and the low temperature side hot water are connected. The mixing valve 22 can be assembled in a downwardly inclined manner by a simple operation.

  Furthermore, a discharge port 12 that opens in a direction orthogonal to the surface of the end plate 5b and discharges high-temperature water is provided at a position radially spaced from the center of the dome-shaped end plate 5b of the hot water storage tank 5, The hot and cold water mixing valve 21 and the low temperature side hot and cold water mixing valve 22 are assembled so that the opening direction of the discharge port 12 and the shaft centers 23A and 23B of the case body 23 are orthogonal to each other. As long as the pipe 7 is connected to the discharge port 12 or the outlet port 33A, the pipe can be assembled in a downwardly inclined manner. Therefore, since the straight pipe is not required to be bent, the pipe in the vicinity of the discharge port 12 of the hot water storage tank 5 and the pipe in the vicinity of the high temperature side hot / cold water mixing valve 21 and the low temperature side hot / cold water mixing valve 22 have a simple configuration and low cost. Can be provided in a downwardly inclined manner.

Next, an example in which the above embodiment is partially changed will be described.
[1] In the above embodiment, the hot water mixing valve 21 and the low temperature hot water mixing valve 22 are assembled as hot water mixing means, but it is not particularly limited to this structure. A hot and cold water mixing valve that mixes hot hot water and water to produce mixed hot water may be assembled, and the structure of the present invention may be applied to this hot and cold water mixing valve.

[2] In the high temperature side hot / cold water mixing valve 21 and the low temperature side hot / cold water mixing valve 22 of the above-described embodiment, the end of the case main body 23 opposite to the drive motor 26 is one end, and the case main body 23 side of the drive motor 26 Although the end portion is described as the other end portion, the present invention is not limited to this. The case main body 23 has the end portion on the drive motor 26 side as the one end portion so as to have a reverse structure to the embodiment. 23 may be the other end portion on the opposite side to the drive motor 26.

  That is, as shown in FIG. 6, in the high temperature side hot water mixing valve 21 and the low temperature side hot water mixing valve 22, the first introduction ports 31 </ b> A and 31 </ b> B are in the vicinity of one end of the case body 23 in the direction of the axial centers 23 </ b> A and 23 </ b> B. The case body 23 may be provided so as to open in a direction orthogonal to the direction of the axis 23A, and the second introduction ports 32A and 32B are in the vicinity of the other end of the case body 23 in the direction of the axes 23A and 23B. The case body 23 may be provided so as to open in a direction parallel to the direction of the axis 23A.

  In the case of the above structure, the high temperature side hot water mixing valve 21 and the low temperature side hot water mixing valve 22 are positioned such that the first introduction ports 31A and 31B on the high temperature water side are higher than the second introduction ports 32A and 32B on the low temperature water side. (The end of the case body 23 on the side of the drive motor 26 is positioned higher) and the outlets 33A and 33B are assembled so as to face obliquely downward.

[3] In addition, those skilled in the art can implement the present invention in various forms with various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. It is.

DESCRIPTION OF SYMBOLS 1 Hot water storage type hot water supply apparatus 5 Hot water storage tank 5b, 5c End plate 12 Discharge port 21 High temperature side hot water mixing valve 22 Low temperature side hot water mixing valve 23 Case main body 23A, 23B Axle 27 Valve body 31A, 31B 1st introduction port 32A, 32B 2nd Inlet 33A, 33B Outlet

Claims (2)

A hot water storage type hot water supply device configured to mix hot water discharged from the upper part of a hot water storage tank and low temperature water having a temperature lower than that of the hot water to discharge mixed hot water, and the shaft center in the case body In a hot water storage type hot water supply apparatus provided with hot water mixing means capable of adjusting a mixing ratio of the high temperature water and the low temperature water through a valve body that moves forward and backward in a direction,
The hot water mixing means is provided in the vicinity of one end portion of the case body in the axial direction, and is provided in the vicinity of the other end portion of the case body in the axial direction. A second inlet through which the low-temperature water can be introduced; and a lead-out port that is provided in the middle of the axial direction of the case body and discharges the mixed hot water,
The outlet port is provided in the case body so as to open in a direction perpendicular to the axial direction of the case body, and the hot water mixing means is configured such that the first inlet port is higher than the second inlet port. A hot water storage type hot water supply apparatus that is set and assembled so that the outlet port faces obliquely downward. The upper end portion of the hot water storage tank is composed of a dome-shaped end plate,
A discharge port that opens in a direction orthogonal to the surface of the end plate and discharges the high-temperature water is provided at a position spaced radially from the center of the end plate, and the discharge port is provided in the first introduction port. Connected,
2. The hot water storage type hot water supply apparatus according to claim 1, wherein the hot water mixing means is assembled so that an opening direction of the discharge port and an axis of the case main body are orthogonal to each other.