JP2020038030A - Hot-water supply system - Google Patents

Abstract

To solve a problem that a conventional hot-water supply system is convenient in discharging hot-water at a predetermined temperature immediately after opening a discharging portion, but it is a device to be installed in a large-sized commercial facility such as a hotel and is not suitable for being installed in a small scale standard home.SOLUTION: A reserve tank equipped with a heating means is provided at a middle point of a circulation passage, and a pump is arranged so as to such out hot-water in the reserve tank and circulate that in the circulation passage. A mixing tank is provided between a discharging side and a branching portion of the pump. A clean water pipe is connected to the mixing tank through a water amount servo with a valve closing function that variably controls a flow rate, and the hot-water from a hot-water supply device is distributed in two directions at an optional ratio through the water amount server with the valve closing function. One distributing port of a diversion servo which variably controls the distribution ratio is connected to the mixing tank, and the other distributing port is connected to the reserve tank.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD The present invention relates to a hot water supply system capable of immediately supplying hot water from a discharge unit such as a shower provided mainly in a bathroom at home.

  In order to enable hot water to be discharged immediately when the discharge unit such as a faucet or shower is opened, a hot water supply is provided immediately, and a circulation path for constantly circulating hot water is provided, and a heat exchanger of a water heater is provided in a part of the circulation path. Are connected in series, and when the temperature of hot water in the circulation passage decreases, a gas burner of a hot water supply device is burned to heat hot water in the circulation passage (for example, see Patent Document 1).

  In this apparatus, since the water temperature in the circulation passage is always maintained at the set water temperature, hot water of a predetermined temperature is discharged immediately when a discharge unit such as a shower is opened. It should be noted that such a hot water supply system capable of immediately supplying hot water is designed to be installed in a relatively large building such as a hotel.

JP 2012-13243 A (FIG. 1)

  The above-mentioned conventional hot water supply system is convenient in that hot water of a predetermined temperature is discharged immediately when the discharge unit is opened, but since it is a device installed in a large commercial facility such as a hotel, it is a small general hot water supply system. It is unsuitable for installation in a healthy home.

  In addition, since hot water is constantly circulating, heat is always radiated from the circulation passage, which is not desirable in terms of energy saving. If it is excellent, it will be acceptable if it takes time to take a hot water.

  In view of the above problems, an object of the present invention is to provide a hot water supply system that can be installed for general household use.

  In order to solve the above-mentioned problems, a hot water supply system according to the present invention has a branch section for branching hot water at a discharge section serving as a hot water supply port in a circulation passage through which hot water is circulated by a pump. When the opening / closing means provided in the opening is opened, in a hot water supply system in which hot water in the circulation passage is discharged from the discharge portion, a reserve tank provided with a heating means is provided in the middle of the circulation passage, and the hot water in the reserve tank is sucked out. The pump is disposed so as to circulate in the circulation passage, a mixing tank is provided between the discharge side of the pump and the branch section, and a valve closing function for variably controlling the flow rate of the mixing tank is provided. A water pipe is connected via a water volume servo, and hot water from the hot water supply device is distributed in two directions at an arbitrary ratio via a water volume servo with a valve closing function, and the distribution ratio is variably controlled. One distribution opening of the servo connected to the mixing vessel, further, the other dispensing port, characterized in that connected to the reserve tank.

  The discharge section discharges the hot water branched from the circulation passage. In the circulation passage, in addition to the hot water supplied from the hot water supply device, the hot water stored in the reserve tank and sent to the circulation passage by the pump flows. With this configuration, when the supply of hot water from the hot water supply device is delayed, the supply of hot water from the reserve tank prevents the discharge of hot water from the discharge unit from being delayed.

  If hot water remains in the reserve tank for a long time, there is a possibility that various bacteria may propagate in the hot water. Therefore, it is desirable that the residual water in the reserve tank is heated by the heating means to sterilize the residual water in the reserve tank.

  Sterilization may be performed by heating by the heating means as described above. However, a germicidal lamp in the reserve tank may be provided so that residual water in the reserve tank can be sterilized by the germicidal lamp.

  Further, when the hot water supply system according to the present invention is not used for a long time, the pump is operated in a state where the opening / closing means provided in the discharge section is opened, and a drain mode for discharging residual water in the reserve tank is provided. Is desirable.

  By the way, a closing means for closing the reserve tank against the outside air is provided, and in a state where the reserve tank is shut off from the outside air, the hot water supply device is connected to the reserve tank by the shunt servo and the reserve tank is connected. High pressure mode in which the internal pressure is increased to the discharge pressure from the hot water supply device, the hot water in the reserve tank is lifted by the pump, the discharge pressure is pressurized by the lift, and supplied to the discharge section. Can be prepared.

  As is apparent from the above description, the present invention is configured so that hot water can be supplied to both the discharge unit from the hot water supply device and the reserve tank. It can be configured smaller than a hot water supply system, and can be easily applied to homes.

The figure which shows the structure of one Embodiment of this invention. Diagram showing the flow of hot water in a specific hot water supply state Diagram showing the flow of hot water in a specific hot water supply state Diagram showing the flow of hot water in a specific hot water supply state

  An example of the configuration of the hot water supply system according to the present invention will be described with reference to FIG. Reference numeral 1 denotes a hot water supply device that heats cold water supplied from a water pipe and supplies hot water as hot water. Hot water supplied from the hot water supply device 1 is supplied to a discharge section 2 which is a supply port for supplying hot water to a bathroom, and supplied from these discharge sections 2 into the bathroom. In the present embodiment, three types of ejection units 2 are provided. The first is a hand shower 21, the second is a callan 22, and the third is a large shower 23 provided on the ceiling of the bathroom. Each discharge part 2 is piped such that hot water branched from a branch part 42 provided in the circulation passage 41 is supplied. Electromagnetically controlled on-off valves 21 a and 22 a are provided at the end of each discharge part 2. , 23a are provided. These three on-off valves 21a, 22a, and 23a are normally closed, and are controlled to open when a discharge operation is performed on at least one of the discharge units 2.

  A split-flow servo 3 is connected to the discharge side of the water heater 1 via a water volume servo 31. The water amount servo controls the amount of water that passes through the opening and the degree of opening increased or decreased by a control signal from the outside, and holds the previously set water amount until a signal to change the water amount is separately received. . The water volume servo 31 has a valve closing function, and can maintain the opening at an arbitrary opening from the valve closed state to the fully opened state. The split flow servo distributes incoming hot water at an arbitrary ratio in two directions. In the shunt servo 3 according to the present embodiment, one of the shunts is connected to the reserve tank 5 and the other is connected to the mixing tank 4.

  The water tank 7 is connected to the mixing tank 4 via a water amount servo 71 similar to the water amount servo 31 described above. Cold water at about room temperature is supplied from the water pipe 7. Therefore, in the mixing tank 4, the cold water that has passed through the water pipe 7 is mixed with the hot water from the hot water supply device. The mixed hot water returns to the reserve tank 5 through the circulation passage 41. The circulation passage 41 is provided with a branch portion 42 and an electromagnetic on-off valve 43.

  The hot water in the circulation passage 41 is branched from the branch part 42 to the discharge part 2 provided in the bathroom. In the present embodiment, as the discharge unit 2, a hand shower 21, a callan 22, and a large shower 23 provided on the ceiling are provided in the bathroom. These three types of discharge units 21, 22, 23 are provided with electromagnetic on-off valves 21a, 22a, 23a similar to the on-off valve 43, respectively. Therefore, in a state where these three on-off valves 21a, 22a, and 23a are closed, hot water is not discharged from any of the discharge units 2. Then, for example, when it is desired to discharge hot water from the hand shower 21, the on-off valve 21a is opened.

  A pump 6 is connected to the reserve tank 5. When the pump 6 sucks hot water in the reserve tank 5, the sucked hot water is supplied to the mixing tank 4 through a pipe 61. You. The reserve tank 5 is provided with an exhaust pipe for making the pressure in the reserve tank 5 equal to the atmospheric pressure, and the exhaust pipe is provided with an on-off valve 51. The opening / closing valve 51 is normally in an open state, but functions to close when a valve closing signal is received. Further, inside the reserve tank 5, a germicidal lamp 52 for sterilizing residual water in the reserve tank 5 is provided. The germicidal lamp 52 has an ultraviolet LED, and sterilizes the hot water in the reserve tank 5 by irradiating the hot water with ultraviolet rays. Further, a heater 53 is provided. The heater 53 is used not only for heating the hot water in the reserve tank 5 to an appropriate temperature, but also for heating and sterilizing the hot water in the reserve tank 5 by heating it to a higher temperature than the appropriate temperature. Further, the reserve tank 5 is provided with three water level sensors. That is, a water level sensor 54L for detecting a minimum water level, a water level sensor 54H for detecting a maximum water level, and a water level sensor 55 for detecting a full state for safety are provided. The operation of the hot water supply system having the above configuration will be described below. Although not shown, temperature sensors for detecting the temperature of hot water are provided at various points in the hot water supply system as needed.

  Referring to FIG. 2 (a), immediately after the start of the operation of the present hot water supply system, the temperature of the hot water sent from hot water supply device 1 has not sufficiently increased. Therefore, such cold water cannot be supplied to the discharge unit 2. Therefore, the water volume servo 31 is fully opened and the flow ratio of the flow servo 3 is changed to guide all of the hot water (low temperature) supplied from the hot water supply device 1 to the reserve tank 5. The water volume servo 71 of the water pipe 7 is kept closed. Therefore, neither hot water from the hot water supply device 1 nor cold water from the water pipe 7 is supplied to the mixing tank 4, so that hot water does not circulate in the circulation passage 41. Since the hot water is not supplied to the discharge unit 2 as described above, all the three on-off valves 21a, 22a, and 23a are closed. The on-off valve 43 of the circulation passage 41 may be in a closed state without any problem, but in the present embodiment, it is kept in an open state. In this state, all the hot water from the hot water supply device 1 flows to the reserve tank 5. The on-off valve 51 is in an open state, the germicidal lamp 52 is turned on, and the water temperature in the reserve tank 5 is heated by the heater 53 to a predetermined hot water temperature.

  Referring to FIG. 2 (b), when the temperature of the hot water from hot water supply device 1 reaches a predetermined water temperature, the split ratio of split flow servo 3 is changed so that all of the hot water discharged from hot water supply device 1 is mixed in the mixing tank. Switch to flow to 4. The temperature of the hot water sent from the hot water supply device 1 is set higher than the temperature of the water when it is discharged from the discharge unit 2, and the water temperature in the mixing tank 4 is set to the temperature discharged from the discharge unit 2. By adjusting the opening of the water volume servo 71, the hot water from the hot water supply device 1 and the cold water from the water pipe 7 are mixed in the mixing tank 4. The hot water that has been mixed to have an appropriate temperature flows from the circulation passage 41 to the reserve tank 5 through the branch portion 42. In this state, the hot water can be discharged from the discharge unit 2. However, the hot water is not discharged from the discharge unit 2 because the on-off valves 21a, 22a, and 23a are closed.

  Referring to FIG. 3A, when a discharge operation (not shown) is performed on, for example, the hand shower 21, the on-off valve 21 a provided for the hand shower 21 is opened. In the present embodiment, all of the warm water flowing through the circulation passage 41 is supplied to the hand shower 21 by simultaneously closing the on-off valve 43. However, when the on-off valve 21a provided for the hand shower 21 is intermittently opened and closed repeatedly, when the on-off valve 21a is closed, the supply of hot water from the water heater 1 is stopped. Then, the gas burner in the water heater 1 extinguishes, and the gas burner in the water heater 1 reignites when the on-off valve 21a opens again, and the temperature of the hot water sent from the water heater 1 becomes unstable. Therefore, the distribution ratio of the shunt servo 3 is adjusted so that a portion of the hot water sent from the hot-water supply device 1 flows directly to the reserve tank 5, so that the on-off valve 21a of the hand shower 21 is closed. Also, the temperature of the hot water sent from the hot water supply device 1 is stabilized by preventing the hot water supply from the hot water supply device 1 from stopping.

  Referring to FIG. 3B, cold water or hot water is constantly supplied to reserve tank 5 during the above-described series of operations. As a result, the water level in the reserve tank 5 continues to rise. When the water level rises to a position where the water level sensor 54H is provided, the operation of the water heater 1 is temporarily stopped. With this alone, the supply of the hot water to the mixing tank 4 is stopped, so that the hot water stored in the reserve tank 5 is supplied to the mixing tank 4 by the pump 6. In this state, the hot water in the reserve tank 5 circulates from the pump 6 through the mixing tank 4 to return from the circulation passage 41 to the reserve tank 5. In this state, for example, when the hot water discharge operation is performed from the hand shower 21 as described above, the open / close valve 21a opens and the open / close valve 43 closes as described with reference to FIG. The warm water in the circulation passage 41 is discharged from the hand shower 21. As described above, when the hot water in the reserve tank 5 continues to be discharged from any of the discharge units 2, the hot water stored in the reserve tank 5 decreases, and the water level decreases. When the water level in the reserve tank 5 drops to the position of the water level sensor 54L, the state returns to the state shown in FIG. 2B, the pump 6 is stopped, and the hot water supply device 1 is operated again, so that the hot water in the reserve tank 5 is returned. Instead of using the hot water sent from the hot water supply device 1 to prepare for the discharge of the hot water from the discharge unit 2.

  In the above operation, the water pressure when the hot water is discharged from the discharge unit 2 is either the water pressure sent from the water heater 1 or the water pressure lifted by the pump 6. The water pressure by the pump 6 must allow the flow of the cold water from the water pipe 7 into the mixing tank 4, so that the water pressure must be substantially the same as the water supply pressure of the water pipe 7. The water pressure sent out by the hot water supply device 1 is also substantially the same as the water supply pressure of the water pipe 7. Therefore, the water pressure at the time of discharge from the discharge part 2 is also substantially equal to the water supply pressure of the water pipe 7. When it is desired to increase the discharge pressure from the discharge unit 2, as shown in FIG. 4, the on-off valve 51 that opens the pressure in the reserve tank 5 to the atmospheric pressure is closed, and the reserve tank 5 is closed. The distribution ratio of the shunt servo 3 is changed in a closed state, and switching is performed so that all of the hot water sent from the water heater 1 flows into the reserve tank 5. Then, the pressure in reserve tank 5 increases to the pressure at which hot water is supplied from hot water supply device 1. In this state, the pump 6 is operated, a pressure corresponding to the head of the pump 6 is further applied, and hot water having a water pressure almost twice the supply water pressure is supplied to the mixing tank 4. The supplied high-pressure hot water is supplied from the circulation passage 41 to one of the discharge portions through the branch portion 42. In the present embodiment, high-pressure hot water is discharged from the hand shower 21.

  By the way, as described above, in the hot water supply system described in the present embodiment, hot water is always stored in reserve tank 5 during operation. When the hot water supply system is stopped by the main operation, it becomes necessary to discharge the hot water in the reserve tank 5. In this case, for example, the on-off valve 22b provided for the curan 22 is automatically opened, the pump 6 is further operated, and the on-off valve 43 of the circulation passage 41 is closed, so that the residual gas in the reserve tank 5 is left. All the hot water that has been drained from the curran 22 by the pump 6.

  The present invention is not limited to the above-described embodiment, and various changes may be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Hot-water supply device 2 Discharge part 3 Split-flow servo 4 Mixing tank 5 Reserve tank 6 Pump 7 Water pipe 21 Hand shower 22 Callan 23 Large shower 31 Water volume servo 41 Circulation path 42 Branch part 51 Open / close valve 52 Sterilization lamp 53 Heater 54H Water level sensor 54L Water level Sensor 55 Water level sensor 71 Water level servo

Claims (5)

  A branch section for branching hot water is provided in a discharge section, which is a hot water supply port, in a circulation path in which hot water is circulated by a pump, and when opening and closing means provided between the branch section and the discharge section is opened, the inside of the circulation path In a hot water supply system in which hot water is discharged from a discharge unit, a reserve tank provided with a heating means is provided in the middle of the circulation path, and the pump is disposed so as to suck out hot water in the reserve tank and circulate the hot water in the circulation path. A mixing tank is provided between the discharge side of the pump and the branch section, and a water pipe is connected to the mixing tank via a water volume servo with a valve closing function for variably controlling a flow rate, and a water heater is provided. The hot water from the is distributed in two directions at an arbitrary ratio via a water volume servo with a valve closing function, and one distribution port of a shunt servo that variably controls the distribution ratio is connected to the mixing tank, and further, other Hot water supply system of dispensing port, characterized in that connected to the reserve tank.   2. The hot water supply system according to claim 1, wherein the remaining water in the reserve tank is heated by the heating means so that the remaining water in the reserve tank can be sterilized. 3.   The hot water supply system according to claim 1 or 2, wherein a germicidal lamp in the reserve tank is provided, and the germicidal lamp can sterilize residual water in the reserve tank.   4. A drain mode in which the pump is operated in a state where an opening / closing means provided in the discharge unit is opened to discharge residual water in the reserve tank. Hot water supply system as described.   A closing means for closing the reserve tank against the outside air is provided, and in a state where the reserve tank is shut off from the outside air, the hot water supply device is connected to the reserve tank by the shunt servo, and the inside of the reserve tank is A high-pressure mode is provided in which the pressure is increased to the discharge pressure from the hot water supply device, and further, the hot water in the reserve tank is lifted by the pump, and the discharge pressure is pressurized by the amount of the lift and supplied to the discharge section. The hot water supply system according to any one of claims 1 to 4, wherein:

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