JP4331052B2 - Hot water heater - Google Patents

Description

  The present invention relates to a fluid mixing valve that mixes fluids and a hot-water storage water heater that supplies hot water by mixing hot water stored using the fluid mixing valve with hot water.

Conventionally, as shown in Patent Document 1, this type of hot water heater is connected to a sealed hot water storage tank for storing hot water, a tapping pipe connected to the upper part of the hot water storage tank, and an intermediate portion of the hot water storage tank. Intermediate hot water pipe, a water supply pipe connected to the lower part of the hot water storage tank, a water supply bypass pipe branched from the water supply pipe and bypassing the hot water storage tank, and an intermediate where hot water from the hot water pipe and hot water from the intermediate hot water pipe are mixed A mixing valve, and a hot water mixing valve for mixing hot water from the intermediate mixing valve and water from the water supply bypass pipe, and hot water stored in a hot water storage tank by controlling the intermediate mixing valve and the hot water mixing valve, respectively. Water from the water supply bypass pipe was mixed with a desired temperature to supply hot water. By using the intermediate mixing valve and the hot water supply mixing valve in this way, the medium temperature water generated in the intermediate part of the hot water tank due to the disturbance of the boundary layer between hot water and water or the heat exchange with the outside etc. Priority is given to hot water supply. Here, as a mixing valve conventionally used in such a hot water storage type hot water heater, a mixing valve as shown in Patent Document 2 is known.
JP 2003-240342 A JP 2003-287280 A

  However, in this conventional system, adjusting the upstream mixing valve affects the temperature of the downstream mixing valve, so that it is difficult to supply hot water at a stable temperature, and two mixing valves are required. Furthermore, in order to control each mixing valve, a temperature sensor is required downstream of each mixing valve, resulting in a high product cost.

  In view of the above-mentioned problems, the present invention stabilizes the hot water supply temperature of a hot water storage hot water heater that supplies hot water in the middle part of the hot water tank in preference to the hot water in the upper part of the hot water tank, and at the same time reduces the product cost. It is an object of the present invention to provide a fluid mixing valve particularly suitable for use in a hot water storage water heater.

  Therefore, in order to solve the above problems, the present invention provides a hot water storage tank for storing hot water, heating means for heating the hot water in the hot water storage tank, and a water supply pipe for supplying water to the lower part of the hot water storage tank. A hot water discharge pipe for discharging hot water from an upper part of the hot water storage tank, an intermediate hot water discharge pipe for discharging hot water from an intermediate part of the hot water storage tank, a water supply bypass pipe branched from the water supply pipe and bypassing the hot water storage tank, and hot water from the hot water supply pipe; A hot water storage type water heater comprising a fluid mixing valve for mixing hot water from the intermediate hot water pipe and water from the feed water bypass pipe, and an intermediate hot water temperature sensor for detecting a temperature in the vicinity of the intermediate hot water pipe of the hot water storage tank. The fluid mixing valve includes a first inflow port that communicates with the tapping pipe, a second inflow port that communicates with the intermediate tapping pipe, and a third inflow port that communicates with the feed water bypass pipe. A body portion formed with an outflow port through which mixed hot water flows out, a valve chamber formed in the body portion and communicating with the first to third inflow ports and the outflow port, and disposed in the valve chamber A valve body that closes one of the first outflow port or the third inflow port, changes the opening ratio of the other two inflow ports, and flows the mixed fluid out of the outflow port; And a valve driving means for adjusting the mixing ratio by driving the body, and provided with a control unit for determining the standby position of the valve body during the hot water supply standby based on the temperature detected by the intermediate hot water storage temperature sensor.

  According to a second aspect of the present invention, when the intermediate hot water storage temperature sensor detects a temperature exceeding a predetermined temperature, the control unit causes the valve body to wait for hot water supply with at least the third inflow port opened, and When the intermediate hot water temperature sensor detects a temperature lower than the set temperature, the valve body is made to wait for hot water supply with at least the second inflow port opened.

  According to a third aspect of the present invention, a hot water storage tank for storing hot water, heating means for heating the hot water in the hot water storage tank, a water supply pipe for supplying water to the lower part of the hot water storage tank, and a hot water discharge pipe for discharging hot water from the upper part of the hot water storage tank. An intermediate upper hot water discharge pipe for discharging hot water from the upper part of the intermediate part of the hot water storage tank, an intermediate lower hot water discharge pipe for discharging hot water from the lower part of the intermediate part of the hot water storage tank, and a water supply bypass that branches from the water supply pipe and bypasses the hot water storage tank A pipe, a fluid mixing valve for mixing hot water from the hot water discharge pipe, hot water from the intermediate hot water discharge pipe and water from the feed water bypass pipe, and an intermediate for detecting the temperature in the vicinity of the intermediate upper hot water discharge pipe of the hot water storage tank A hot water storage water heater comprising an upper hot water storage temperature sensor and an intermediate lower hot water storage temperature sensor for detecting a temperature in the vicinity of the intermediate lower hot water discharge pipe of the hot water storage tank, wherein the fluid mixing valve A first inflow port that communicates with the tapping pipe, a second inflow port that communicates with the middle upper tapping pipe, a third inflow port that communicates with the middle lower tapping pipe, and a fourth inflow port that communicates with the feed water bypass pipe And a body part formed with an outflow port through which the mixed hot water flows out, a valve chamber formed in the body part and communicating the first to fourth inflow ports and the outflow port, and the valve chamber A valve body that closes any two outflow ports adjacent to each other, changes the opening ratio of the other two inflow ports, and flows the mixed fluid out of the outflow port, and drives the valve body. And a valve drive means for adjusting the mixing ratio, and a control unit is provided for determining a standby position of the valve body during standby for hot water supply based on temperatures detected by the intermediate upper hot water storage temperature sensor and the intermediate lower hot water storage temperature sensor.

  According to a fourth aspect of the present invention, when the intermediate lower hot water storage temperature sensor detects a temperature exceeding a predetermined temperature, the control unit causes the valve body to wait for hot water supply with at least the fourth inflow port opened, When the intermediate lower hot water storage temperature sensor is below a predetermined temperature and the intermediate upper hot water storage temperature sensor detects a temperature exceeding the predetermined temperature, the valve body is at least in a state where the third inflow port is open, When the intermediate upper hot water storage temperature sensor detects a temperature lower than a predetermined temperature, the valve body is made to wait for hot water supply with at least the second inflow port opened.

  According to the present invention, it is possible to supply hot water at a set temperature by using medium-temperature water in the middle of the hot water tank in preference to high-temperature water in the upper part of the hot water tank with a single fluid mixing valve, and the product cost of the hot water heater The hot water temperature can be easily controlled and stable hot water can be supplied.

  In addition, the standby position of the fluid mixing valve in the hot water supply standby state is changed according to the temperature of the intermediate portion of the hot water storage tank, so the time required to reach the set temperature from the start of hot water supply is shortened and the hot water supply temperature is reduced. It is possible to provide a hot water storage type hot water heater with less undershoot and better use feeling of hot water supply.

Next, an embodiment of the present invention will be described with reference to FIGS.
This hot water heater is used to boil and store hot water in the midnight hours when the unit price of contracted electric power by time is low, and to use this hot water for hot water supply. 1 is a hot water storage tank 2 for storing hot water. 3 is a heating means such as a heat pump unit for heating hot water in the hot water storage tank, 4 is a hot water tap provided in a kitchen or a washroom, 5 is a remote control for setting a hot water supply set temperature, 6 is a bathtub.

  The hot water storage tank 2 of the hot water storage tank unit 1 has a hot water discharge pipe 7 connected to the upper end, a water supply pipe 8 connected to the lower end, a heat pump forward pipe 10 constituting a heat pump circulation circuit 9 in the lower part, and a heat pump circulation circuit in the upper part. 9 is connected to the heat pump return pipe 11, the hot water in the hot water storage tank 2 taken out from the heat pump forward pipe 10 is heated by the heating means 3, returned from the heat pump return pipe 11 to the hot water storage tank 2, and stored. Hot water in the hot water storage tank 2 is pushed up by water supply from the water supply pipe 8, and high temperature water in the upper part of the hot water storage tank 2 is pushed out from the hot water discharge pipe 7 to supply hot water. In addition, 12 is a pressure reducing valve provided in the water supply pipe 8 to reduce the water supply pressure to a predetermined value, 13 is a water supply temperature sensor provided in the water supply pipe 8 to detect the temperature of the water supply, and 14 is hot water storage provided in the middle of the tap water pipe 7. This is an overpressure relief valve that releases overpressure in the tank 2.

  The heating means 3 includes a compressor 15, a refrigerant-water heat exchanger 16 as a condenser, an electronic expansion valve 17, a heat pump circuit 19 including a forced air-cooled evaporator 18, and hot water in the hot water storage tank 2. A heat pump circulating pump 20 that circulates to the refrigerant-water heat exchanger 16 through the heat pump forward pipe 10 and the heat pump return pipe 11 and a heat pump control unit 21 that controls driving thereof are provided. Is one in which carbon dioxide is used as a refrigerant to constitute a supercritical heat pump cycle. Since carbon dioxide is used as the refrigerant, it is possible to boil low temperature water to a high temperature of about 90 ° C. without an electric heater.

  Next, 22 is a bath heat exchanger made of a stainless steel snake tube for heating the hot water in the bathtub 6. The heat exchanger 22 has a bath return pipe 25 having a bath tube 23 and a bath circulation pump 24. The hot water in the bathtub 6 can be circulated, and the hot water in the bathtub 6 is heated by the high-temperature water in the hot water storage tank 2 to perform heat insulation or reheating. A bath temperature sensor 27 detects the temperature of the hot water in the bathtub 6 circulating through the bath return pipe 25. The bath circulation pump 24 is driven when a bath warming command or a warming command is issued. When the bath temperature sensor 27 detects a desired temperature, the bath circulation pump 24 is stopped and the operation is completed. At this time, the temperature of the hot water below the uppermost part of the bath heat exchanger 22 is lowered by heat exchange with the bath water.

  Next, 28 is an intermediate hot water pipe connected to an intermediate position of the hot water storage tank 2, and heat transfer is performed in the vicinity of the boundary layer of medium-temperature water or hot water / water whose temperature has decreased due to heat exchange with the bath side in the bath heat exchanger 22. The hot water stored in the intermediate position of the hot water storage tank 2 such as medium hot water whose temperature is lowered or increased due to the hot water is discharged from the hot water storage tank 2.

  Next, 29 is a water supply bypass pipe branched from the water supply pipe 8 to bypass the hot water storage tank 2, and 30 is hot water from the hot water discharge pipe 7, hot water from the intermediate hot water supply pipe 28, and water from the water supply bypass pipe 29. Are a hot water supply temperature sensor provided in a hot water supply pipe 32 downstream of the fluid mixing valve 30, and a hot water supply flow rate counter 33 that counts the amount of hot water to be supplied.

  Reference numeral 34 denotes a hot water filling pipe branched from the hot water supply pipe 32 and connected to the bath circulation circuit 26, and a hot water filling valve 35 for starting / stopping the hot water filling to the bathtub 6 and a back flow to the bathtub 6. Backflow prevention means 36 such as a check valve is provided.

  Next, a plurality of hot water storage temperature sensors 37 are arranged in the vertical direction of the hot water storage tank 2. In this embodiment, five hot water storage temperature sensors are arranged and are called 37a, 37b, 37c, 37d, 37e from the top. The amount of heat remaining in the hot water storage tank 2 is detected based on the temperature information detected by the temperature sensor 37, and the vertical temperature distribution in the hot water storage tank 2 is detected.

  Reference numeral 38 denotes a control unit having a microcomputer that receives the input of each sensor in the hot water storage tank unit 1 and controls the drive of each actuator. The remote controller 5 is connected to the control unit 38 by radio or wire so that the user can set an arbitrary hot water supply set temperature and bath set temperature. The control unit 38 controls the fluid mixing valve 30 so that the temperature detected by the hot water supply temperature sensor 31 at the time of hot water supply becomes a set temperature, or the heat pump control unit 21 so that the hot water in the hot water storage tank 2 boils at midnight. Is used to instruct a boiling command.

  Next, the heating operation will be described. When the hot water storage temperature sensor 37 detects that the necessary amount of heat does not remain in the hot water storage tank 2 in the midnight power time zone, the control unit 38 controls the heat pump control unit 21. In response, a boiling start command is issued. Upon receiving the command, the heat pump controller 21 starts driving the heat pump circulation pump 20 after starting the compressor 15, and cools the low temperature water of about 5 to 20 ° C. taken out from the heat pump forward pipe 10 connected to the lower part of the hot water storage tank 2 as a refrigerant. -Heated to a high temperature of about 70 to 90 ° C by the water heat exchanger 16, returned to the hot water storage tank 2 from the heat pump return pipe 11 connected to the upper part of the hot water storage tank 2, and stacked in order from the upper part of the hot water storage tank 2 Store hot water. When the hot water storage temperature sensor 37 detects that the necessary amount of heat has been stored, the control unit 38 issues a boiling stop command to the heat pump control unit 21, and the heat pump control unit 21 stops the compressor 15 and the heat pump circulation pump. 20 is also stopped and the boiling operation is completed. In the hot water storage tank 2, high temperature water is stored in the upper part and low temperature water is stored in the lower part. A difference in specific gravity occurs due to the temperature difference, and a high temperature water having a low specific gravity is formed in the upper part by forming a temperature boundary layer. , Low temperature water with heavy specific gravity is located in the lower part, so it will not mix with each other

  Next, the hot water supply operation will be described. When the hot water tap 4 is opened, the water supplied from the water supply pipe 8 flows into the hot water storage tank 2. Then, the high-temperature water present in the hot water storage tank 2 is pushed out to the fluid mixing valve 30. At the same time, the feed water from the feed water bypass pipe 29 also flows into the fluid mixing valve 30 and is mixed with the set temperature to supply hot water.

Here, the fluid mixing valve 30 will be described in detail with reference to FIGS.
In FIG. 2, reference numeral 39 denotes a body portion of the fluid mixing valve 30, a first inflow port 40 communicating with the tapping pipe 7, a second inflow port 41 communicating with the intermediate tapping pipe 28, and the feed water bypass pipe 29. A third inflow port 42 communicating with the hot water supply pipe 32 and an outflow port 43 communicating with the hot water supply pipe 32 are formed. The first inflow port 40, the second inflow port 41, and the third inflow port 42 are 90 ° between the first inflow port 40 and the second inflow port 41 so that they are T-shaped on the same plane. And the third inflow port 42 are arranged at 90 °, and the third inflow port 42 and the first inflow port 40 are formed at an angle of 180 ° and intersect at one intersection. The outflow port 43 is disposed perpendicular to a plane formed by the first inflow port 40, the second inflow port 41, and the third inflow port 42, and the first inflow port 40, the second inflow port 41, and the third inflow port. It is arranged so as to intersect with the intersection of the ports 42.

  A cylindrical valve chamber coaxial with the outflow port 43 is located at the intersection of the first inflow port 40, the second inflow port 41, the third inflow port 42, and the outflow port 43 in the body portion 39. 44 is provided, and a valve body 45 is disposed in the valve chamber 44. The valve body 45 has a hollow cylindrical shape with the outflow port 43 side opened, and a communication port 46 is formed by opening a part of the peripheral wall.

  47 is a valve driving means for rotating the valve body 45, and is constituted by a stepping motor connected to the valve body 45 and fixed to the body portion 39 so that the rotation angle of the valve body 45 can be freely adjusted. Yes.

  The communication port 46 opens the other two ports by rotating the valve body 45 by the valve driving means 47 in a state where either the first inflow port 40 or the third inflow port 42 is closed. The ratio is formed to be variable. Here, the communication port 46 is formed so that both ends in the circumferential direction are tapered, and the opening area of one of the two unclosed ports is increased by the rotation of the valve body 45, and the other opening area is increased. Acts to decrease. Further, when the valve body 45 is rotated in the reverse direction, the one opening area is reduced and the other opening area is increased. This state may be realized when the valve body 45 is positioned within a plurality of predetermined angle ranges.

  Further, the communication port 46 rotates the valve body 45 to another position to close any two ports of the first inflow port 40, the second inflow port 41, and the third inflow port 42. The port can be opened. This state may be realized when the valve body 45 is positioned at a plurality of predetermined angles.

  The valve driving means 47 is controlled by the control unit 38, and the control unit 38 corresponds to an intermediate hot water storage temperature sensor 48 (which corresponds to 37c in this embodiment) provided near the height position of the intermediate hot water discharge pipe 28. The standby angle of the valve body 45 that is waiting for hot water supply is determined in accordance with the temperature detected by (3), and the valve drive means 47 is driven to rotate the valve body 45 to the determined angle for standby.

  Here, in the state where the temperature detected by the intermediate hot water storage temperature sensor 48 is higher than the set temperature set by the remote controller 5 or the like, the control unit 38 has at least the communication port 46 of the valve body 45 as shown in FIG. The valve drive means 47 is driven to wait for the valve body 45 at an angle at which the third inflow port 42 communicating with the pipe 29 is opened, and the temperature detected by the intermediate hot water storage temperature sensor 48 is set by the remote controller 5 or the like. When the temperature is equal to or lower than the set temperature, the valve drive means is configured to wait for the valve body 45 at an angle at which the communication port 46 of the valve body 45 opens at least the second inflow port 41 communicating with the intermediate tap pipe 28 as shown in FIG. 47 is driven to wait for hot water supply.

  When the hot water supply is started, the control unit 38 drives the valve drive means 47 so that the hot water temperature sensor 31 detects the set temperature set by the remote controller 5 or the like during the hot water supply, and the rotation angle of the valve body 45. Adjust.

  Here, in a state where the temperature detected by the intermediate hot water storage temperature sensor 48 is higher than the set temperature, the control unit 38 is in a state where the third inflow port 42 where the communication port 46 of the valve body 45 communicates with the water supply bypass pipe 29 is opened. As shown in FIG. 5, the valve driving means 47 is driven so as to open the second inflow port 41 communicating with the intermediate hot water discharge pipe 28 to rotate the valve body 45, and the hot water supply temperature sensor 31 is lower than the set temperature. Is detected, the valve body 45 is driven to the side where the opening ratio of the second inflow port 41 is increased, and the hot water supply temperature sensor 31 detects a temperature higher than the set temperature. The valve drive means 47 is driven to the side where the opening ratio of the 3rd inflow port 42 becomes large.

  Further, the control unit 38 starts from the state in which the second inlet port 41 where the communication port 46 of the valve body 45 communicates with the intermediate hot water pipe 28 is opened when the temperature detected by the intermediate hot water temperature sensor 48 is equal to or lower than the set temperature. 6, the valve driving means 47 is driven to open the first inflow port 40 communicating with the hot water discharge pipe 7 and the valve body 45 is rotated, so that the hot water supply temperature sensor 31 detects a temperature lower than the set temperature. If the valve body 45 is driven, the valve driving means 47 is driven to the side where the opening ratio of the first inflow port 40 is increased, and if the hot water supply temperature sensor 31 detects a temperature higher than the set temperature, the valve body 45 Is driven to the side where the opening ratio of the second inflow port 41 is increased.

  Further, the control unit 38 detects that the temperature detected by the hot water storage temperature sensor 48 is equal to or lower than the set temperature, and the hot water temperature sensor 37 near the top of the hot water storage tank 2 (the uppermost hot water temperature sensor 37a in this embodiment) is equal to or lower than the set temperature. In this state, as shown in FIG. 7, the valve drive means 47 is driven at an angle at which the communication port 46 of the valve body 45 opens the first inflow port 40 so as to open the hot water hot water remaining at the top of the hot water storage tank 2. It is possible.

  In this way, it is possible to supply hot water at a set temperature using the middle temperature water in the middle of the hot water storage tank 2 in preference to the high temperature water in the upper part of the hot water storage tank 2, and the product of the hot water heater The cost could be reduced. Also, in the case of controlling two conventional mixing valves connected in series, changing the opening degree of the mixing valve upstream of the flow affects the control of the downstream mixing valve. Although it has been difficult to stabilize the hot water supply temperature, in the present invention, it is possible to perform hot water supply at a set temperature with one fluid mixing valve 30, so that the reliability of control is improved and the hot water supply temperature is stabilized. It will be very easy.

  In addition, since the standby position of the fluid mixing valve 30 in the hot water supply standby state is changed according to the temperature of the intermediate portion of the hot water storage tank 2, the arrival time from the start of hot water supply until the set temperature is reached is shortened. The undershoot of the temperature is reduced, the rising performance of the hot water supply temperature is improved, and a hot water storage water heater with a better feeling of hot water supply can be obtained.

  Next, another embodiment of the present invention will be described with reference to FIGS. In addition, the same thing as previous one Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the description.

  Reference numeral 49 denotes a hot water terminal such as a heating dryer or a floor heating hot water panel, in which hot water heated by the heat exchanger 50 circulates. A primary side of the heat exchanger 50 is connected with a heat exchange primary side forward pipe 51 connected to the upper part of the hot water storage tank 2 and a heat exchange primary return pipe 52 connected to the lower part of the hot water storage tank 2 to form a heat exchange primary circulation circuit. 53, and the high temperature water taken out from the upper part of the hot water storage tank 2 by the operation of the heat exchange primary circulation pump 54 provided in the middle of the heat exchange primary return pipe 52 is circulated to the heat exchanger 50 to exchange heat with the secondary side. Thus, the medium-temperature water whose temperature has been lowered by the above is returned to the hot water storage tank 2.

  On the secondary side of the heat exchanger 50, a heat exchange secondary circulation circuit 57 comprising a heat exchange secondary forward pipe 55 and a heat exchange secondary return pipe 56 is connected to the hot water terminal 49 so that the hot water can be circulated. Then, the hot water of the hot water terminal 49 is circulated to the heat exchanger 50 by the operation of the heat exchange secondary circulation pump 58 provided in the middle of the heat exchange secondary return pipe 56, heated by the high temperature water on the primary side, and heated again. It is circulated to the terminal device 49.

  Next, 59 is an intermediate upper hot water pipe connected to the upper middle position of the hot water storage tank 2, 60 is an intermediate lower hot water pipe connected to the lower middle position of the hot water storage tank 2 below the intermediate upper hot water pipe 59, It is stored in an intermediate position of the hot water storage tank 2 such as medium-temperature water whose temperature has been reduced by heat exchange with the secondary side in the heat exchanger 50 or medium-temperature water whose temperature has been lowered or increased due to heat transfer near the boundary layer of hot water. The hot water is discharged from the hot water storage tank 2.

  61 is a fluid mixing valve of another embodiment, hot water from the tapping pipe 7, hot water from the middle upper tapping pipe 59, hot water from the middle lower tapping pipe 60, hot water from the feed water bypass pipe 29, For mixing and hot water supply.

Here, the fluid mixing valve 61 of this embodiment will be described in detail with reference to FIGS.
In FIG. 9, 62 is a body portion of the fluid mixing valve 61, a first inflow port 63 communicating with the tapping pipe 7, a second inflow port 64 communicating with the middle upper tapping pipe 59, and the middle upper tapping water. A third inflow port 65 communicating with the pipe 60, a fourth inflow port 66 communicating with the water supply bypass pipe 29, and an outflow port 67 communicating with the hot water supply pipe 32 are formed. The first inflow port 63, the second inflow port 64, the third inflow port 65, and the fourth inflow port 66 are arranged in a cross shape on the same plane at an angle of 90 °. The outflow port 67 is disposed perpendicular to the plane formed by the first to fourth inflow ports at the intersection of the first to fourth inflow ports.

  A cylindrical valve chamber 44 is provided coaxially with the outflow port 67 at the intersection of the first to fourth inflow ports 63 to 66 and the outflow port 67 in the body portion 62. A valve body 45 is disposed in the valve chamber 44. The valve body 45 has a hollow cylindrical shape with the outflow port 67 side open, and a communication port 46 is formed by opening a part of the peripheral wall.

  Reference numeral 47 denotes a valve driving means for rotating the valve body 45. The valve drive means 47 is composed of a stepping motor connected to the valve body 45 and fixed to the body portion 62 so that the rotation angle of the valve body 45 can be freely adjusted. Yes.

  The communication port 46 is formed so that the opening ratio of the other two ports can be varied by rotating the valve body 45 by the valve driving means 47 with the two adjacent inflow ports closed. . Here, the communication port 46 is formed so that both ends in the circumferential direction are tapered, and the opening area of one of the two unclosed ports is increased by the rotation of the valve body 45, and the other opening area is increased. Acts to decrease. Further, when the valve body 45 is rotated in the reverse direction, the one opening area is reduced and the other opening area is increased. This state may be realized when the valve body 45 is positioned within a plurality of predetermined angle ranges.

  Further, the communication port 46 can close any three ports of the first to fourth inflow ports 63 to 66 and open the remaining one port by rotating the valve body 45 to another position. It is made possible. This state may be realized when the valve body 45 is positioned at a plurality of predetermined angles.

  The valve driving means 47 is controlled by the control unit 38, and the control unit 38 controls an intermediate upper hot water storage temperature sensor 68 (in this embodiment, 37c) provided near the height position of the intermediate upper hot water discharge pipe 59. Of the valve body 45 in the hot water supply standby state according to the temperature detected by the intermediate lower temperature sensor 69 (corresponding to 37d in this embodiment) provided in the vicinity of the height position of the intermediate lower hot water discharge pipe 60. A standby angle is determined, and the valve drive unit 47 is driven to rotate the valve body 45 to the determined angle and wait.

  Here, in a state where the temperature detected by the intermediate lower hot water storage temperature sensor 69 is higher than the set temperature set by the remote controller 5 or the like, the control unit 38 has at least the communication port 46 of the valve body 45 as the water supply as shown in FIG. The valve drive means 47 is driven to wait for the valve body 45 to wait at an angle at which the fourth inflow port 66 communicating with the bypass pipe 29 is opened, and the temperature detected by the intermediate lower hot water storage temperature sensor 69 is the set temperature. In a state where the temperature detected by the intermediate upper hot water storage temperature sensor 68 is higher than the set temperature, the communication port 46 of the valve body 45 has at least a third inflow port 65 communicating with the intermediate lower hot water discharge pipe 60 as shown in FIG. The valve drive means 47 is driven to wait for the valve body 45 at an open angle to wait for hot water supply, and the intermediate lower hot water storage temperature sensor 69 and the intermediate upper hot water storage temperature sensor 68 together. In a state where a temperature equal to or lower than the constant temperature is detected, the valve body 45 is made to wait at an angle at which the communication port 46 of the valve body 45 opens at least the second inflow port 64 communicating with the intermediate upper hot water discharge pipe 59 as shown in FIG. The valve driving means 47 is driven to wait for hot water supply.

    When the hot water supply is started, the control unit 38 drives the valve drive means 47 so that the hot water temperature sensor 31 detects the set temperature set by the remote controller 5 or the like during the hot water supply, and the rotation angle of the valve body 45. Adjust.

  Here, in the state where the temperature detected by the intermediate lower hot water storage temperature sensor 69 is higher than the set temperature, the control unit 38 opens the fourth inflow port 66 where the communication port 46 of the valve body 45 communicates with the water supply bypass pipe 29. As shown in FIG. 12, the valve drive means 47 is driven to rotate the valve body 45 so that the third inflow port 65 communicating with the intermediate lower hot water discharge pipe 60 is also opened as shown in FIG. When the low temperature is detected, the valve body 45 is driven to the side where the opening ratio of the third inflow port 65 is increased, and the hot water supply temperature sensor 31 detects a temperature higher than the set temperature. In this case, the valve driving means 47 is driven to the side where the opening ratio of the fourth inflow port 66 is increased.

  In addition, the control unit 38 communicates with the communication port 46 of the valve body 45 in a state where the temperature detected by the intermediate lower hot water storage temperature sensor 69 is lower than the set temperature and the temperature detected by the intermediate upper hot water storage temperature sensor 68 is higher than the set temperature. As shown in FIG. 13, the valve driving means 47 is driven so that the second inflow port 64 communicating with the intermediate upper tapping pipe 59 is opened from the state where the third inflow port 65 communicating with the middle lower tapping pipe 60 is opened. When the valve body 45 is rotated and the hot water supply temperature sensor 31 detects a temperature lower than the set temperature, the valve drive means 47 is driven to the side where the opening ratio of the second inflow port 64 is increased. When the hot water supply temperature sensor 31 detects a temperature higher than the set temperature, the valve driving means 47 is driven to the side where the opening ratio of the third inflow port 65 is increased.

  In addition, when the temperatures detected by the intermediate lower hot water storage temperature sensor 69 and the intermediate upper hot water storage temperature sensor 68 are both equal to or lower than the set temperature, the control unit 38 connects the communication port 46 of the valve body 45 to the intermediate upper hot water discharge pipe 59. As shown in FIG. 14, the valve driving means 47 is driven to rotate the valve body 45 so that the first inflow port 63 communicating with the hot water discharge pipe 7 is also opened as shown in FIG. Is detecting a temperature lower than the set temperature, the valve body 45 is driven to the side where the opening ratio of the first inflow port 63 is increased, and the hot water supply temperature sensor 31 is a temperature higher than the set temperature. Is detected, the valve driving means 47 is driven to the side where the opening ratio of the second inflow port 64 is increased.

  In addition, the control unit 38 is configured such that the temperatures detected by the intermediate lower hot water storage temperature sensor 69 and the intermediate upper hot water storage temperature sensor 68 are both lower than the set temperature and the hot water storage temperature sensor 37 near the top of the hot water storage tank 2 (in this embodiment, the uppermost part). When the hot water storage temperature sensor 37a) is below the set temperature, the valve drive means 47 is driven at an angle at which the communication port 46 of the valve body 45 opens the first inflow port 63 as shown in FIG. The hot water storage hot water remaining at the top of 2 can be supplied.

  In this way, it is possible to supply hot water at a set temperature by using the middle temperature water in the intermediate portion of the hot water storage tank 2 in preference to the high temperature water in the upper portion of the hot water storage tank 2, and the product of the hot water heater The cost could be reduced. In addition, in the case of controlling two or more conventional mixing valves connected in series, changing the opening degree of the mixing valve upstream of the flow affects the control of the downstream mixing valve. Although it was difficult to control and stabilize the hot water temperature, in the present invention, the hot water at the set temperature can be supplied by one fluid mixing valve 60, so that the reliability of the control is improved and the hot water temperature is stabilized. It is very easy to do.

  In addition, since the standby position of the fluid mixing valve 30 in the hot water supply standby state is changed according to the temperature of the intermediate portion of the hot water storage tank 2, the arrival time from the start of hot water supply until the set temperature is reached is shortened. The undershoot of the temperature is reduced, the rising performance of the hot water supply temperature is improved, and a hot water storage water heater with a better feeling of hot water supply can be obtained.

  Here, the fluid mixing valves 30 and 61 mix any two of three or four fluids, but are not limited to this, and there are three or more inflow ports and one outflow port. A body portion formed with a port, a valve chamber formed in the body portion and communicating the n inflow ports and one outflow port, and disposed in the valve chamber. n-1) are closed, the opening ratio of the remaining two inflow ports adjacent to each other is varied, and the valve body for flowing the mixed fluid out of the outflow port and the valve body are driven to adjust the mixing ratio. It may be provided with valve drive means.

    As mentioned above, although this invention has been demonstrated based on embodiment shown on drawing, this invention is not limited to this one Embodiment, A various deformation | transformation is possible in the range which does not change the summary of invention. For example, the heating means 3 is not limited to the heat-pump type, but may be an electric heater or an external heater type that directly heats the hot water storage tank 2.

  In the above-described one embodiment, the first to third inflow ports 40 to 42 are arranged in a T shape. However, the present invention is not limited to this, and for example, the first to third inflow ports 40 to 42 are arranged so as to form an equal angle (120 °). It may be.

  In the other embodiment described above, the hot water discharge pipe 7, the intermediate upper hot water discharge pipe 59, the intermediate lower hot water discharge pipe 60, the water supply bypass are sequentially arranged from the first inflow port 63 with respect to the first to fourth inflow ports 63 to 66. Although the pipe 29 is connected, it is not restricted to this, You may connect in order of the hot water discharge pipe 7, the intermediate | middle upper hot water discharge pipe 59, the feed water bypass pipe 29, and the intermediate lower hot water discharge pipe 60 from the 1st inflow port 63 in order. In this case, it is possible to perform mixed hot water from hot water from the hot water outlet pipe 7 and hot water from the intermediate lower hot water pipe 60, and mixed hot water from water from the water supply bypass pipe 29 and hot water from the intermediate upper hot water pipe 59. Become.

  The fluid mixing valves 30 and 61 are not limited to the above-described structure. For example, the first to third inflow ports 70 to 72 are arranged in the axial direction of the cylindrical valve chamber 73 as shown in FIG. The valve chamber 44 is provided with an outflow port 74 at the bottom, and the valve body 75 disposed in the valve chamber 73 corresponds to the first to third inflow ports 70 to 72, respectively. The present invention can also be realized by opening the communication ports 76 to 78 at a predetermined angle (90 ° in this embodiment). The angle formed by the first to third communication ports 76 to 78 is determined according to the angle formed by the first to third inlet ports 70 to 72.

The schematic block diagram of the hot water storage type water heater of one Embodiment of this invention. The longitudinal cross-sectional view of the fluid mixing valve of the same embodiment. The cross-sectional view of the fluid mixing valve. The cross-sectional view of the fluid mixing valve. The cross-sectional view of the fluid mixing valve. The cross-sectional view of the fluid mixing valve. The cross-sectional view of the fluid mixing valve. The schematic block diagram of the hot water storage type water heater of other one Embodiment of this invention. The cross-sectional view of the fluid mixing valve of another embodiment. The cross-sectional view of the fluid mixing valve. The cross-sectional view of the fluid mixing valve. The cross-sectional view of the fluid mixing valve. The cross-sectional view of the fluid mixing valve. The cross-sectional view of the fluid mixing valve. The cross-sectional view of the fluid mixing valve. The longitudinal cross-sectional view of the fluid mixing valve of other one Embodiment.

2 Hot water storage tank 3 Heating means 7 Hot water discharge pipe 8 Water supply pipe 28 Intermediate hot water discharge pipe 29 Water supply bypass pipe 30 Fluid mixing valve 37 Hot water storage temperature sensor 38 Control section 39 Body section 40 First inflow port 41 Second inflow port 42 Third inflow port 43 Outflow port 44 Valve chamber 45 Valve body 46 Communication port 47 Valve drive means 48 Intermediate hot water storage temperature sensor

Claims (4)

A hot water storage tank for storing hot water, heating means for heating the hot water in the hot water storage tank, a water supply pipe for supplying water to the lower part of the hot water storage tank, a hot water discharge pipe for discharging hot water from the upper part of the hot water storage tank, and an intermediate between the hot water storage tanks An intermediate hot water discharge pipe for discharging hot water from a section, a water supply bypass pipe branched from the water supply pipe and bypassing the hot water storage tank, hot water from the hot water discharge pipe, hot water from the intermediate hot water discharge pipe, and water from the water supply bypass pipe A hot water storage water heater comprising a fluid mixing valve for mixing and an intermediate hot water temperature sensor for detecting a temperature in the vicinity of the intermediate hot water discharge pipe of the hot water storage tank, wherein the fluid mixing valve communicates with the hot water discharge pipe. 1 inflow port, a second inflow port through which the intermediate hot water discharge pipe communicates, a third inflow port through which the water supply bypass pipe communicates, and an outflow port through which the mixed hot water flows out are formed. And I over portion, is formed within the body portion, the a valve chamber in which the first to third inlet port and said outlet port communicating with, disposed in the valve chamber, the first flow inlet port or the third inlet port One of the above is closed, the opening ratio of the other two inflow ports other than the closed port is varied, and the valve body that causes the mixed fluid to flow out from the outflow port, and the valve body is driven to thereby mix the ratio And a valve drive means for adjusting the temperature of the hot water storage water heater, wherein a control unit is provided for determining a standby position of the valve body during standby for hot water supply based on a temperature detected by the intermediate hot water storage temperature sensor. When the intermediate hot water temperature sensor detects a temperature exceeding a predetermined temperature, the control unit causes the valve body to wait for hot water supply with at least the third inflow port opened, and the intermediate hot water temperature sensor detects the set temperature. 2. The hot water storage type hot water heater according to claim 1 , wherein when the following is detected, the valve body is made to wait for hot water supply with at least the second inflow port opened. A hot water storage tank for storing hot water, heating means for heating the hot water in the hot water storage tank, a water supply pipe for supplying water to the lower part of the hot water storage tank, a hot water discharge pipe for discharging hot water from the upper part of the hot water storage tank, and an intermediate between the hot water storage tanks An intermediate upper tapping pipe that pours out hot water from the top of the section, a middle lower tapping pipe that pours out water from the lower part of the middle section of the hot water storage tank, a feed water bypass pipe that branches off from the water supply pipe and bypasses the hot water storage tank, and the tapping pipe A fluid mixing valve for mixing hot water from the intermediate hot water pipe and water from the feed water bypass pipe, an intermediate upper hot water temperature sensor for detecting a temperature in the vicinity of the intermediate upper hot water pipe of the hot water tank, and A hot water storage type water heater provided with an intermediate lower hot water storage temperature sensor for detecting a temperature in the vicinity of the intermediate lower hot water discharge pipe of a hot water storage tank, wherein the fluid mixing valve is connected to the hot water discharge pipe. An inflow port, a second inflow port that communicates with the middle upper tapping pipe, a third inflow port that communicates with the middle lower tapping pipe, a fourth inflow port that communicates with the water supply bypass pipe, and mixed hot water A body portion in which an outflow port is formed, a valve chamber formed in the body portion and communicating with the first to fourth inflow ports and the outflow port, and disposed adjacent to the valve chamber. or close the two flow inlet ports, and which varies the open ratio of the closed except port other two inlet ports, a valve body for flowing out the mixed fluid from the outlet port, mixed by driving the valve body A valve drive means for adjusting the ratio, and a control unit is provided for determining a standby position of the valve body during standby for hot water supply based on temperatures detected by the intermediate upper hot water storage temperature sensor and the intermediate lower hot water storage temperature sensor. Hot water storage type water heater to the butterflies. When the intermediate lower hot water storage temperature sensor detects a temperature exceeding a predetermined temperature, the control unit causes the valve body to wait for hot water supply with at least the fourth inflow port opened, and the intermediate lower hot water storage temperature sensor When the intermediate upper hot water storage temperature sensor detects a temperature that is lower than a predetermined temperature and exceeds the predetermined temperature, the valve body waits for hot water supply with at least the third inflow port opened, and the intermediate upper hot water storage temperature The hot water storage type hot water heater according to claim 3 , wherein when the sensor detects a temperature lower than a predetermined temperature, the valve body is made to wait for hot water supply with at least the second inflow port opened. .

Images