JP2008286420A - Storage type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the change of hot water supply temperature from a shower or a faucet to stably supply hot water to the shower or the faucet when the bath hot water is performed during supplying the hot water from the shower or the faucet. <P>SOLUTION: A control portion learns a hot water supply flow rate to a bathtub on the basis of past performance of hot water supply to the bathtub 14, and controls an opening of a hot water supply hot water/water mixing device 10 on the basis of the learned hot water supply flow rate to the bathtub 14, when the hot water supply to the bathtub 14 is started during supplying hot water from a hot water supply terminal 8 (9). The flow rate in supplying hot water to the bathtub is learned on the basis of use performance in bath hot water supply reflecting conditions of each house, and the hot water/water mixing of the hot water supply hot water/water mixing device 10 is controlled on the basis of the learned value when the bath hot water supply is started during supplying hot water from the shower or the faucet and the like, even when installation conditions of a bath and a kitchen, and a condition of water line pressure are various in every house. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hot water storage type water heater, and more particularly to control of a hot water mixing apparatus for mixing hot water.

  Conventional hot water storage water heaters include an electric water heater that heats hot water by incorporating a heater in a hot water storage tank, and a heat pump water heater that heats hot water with a heat pump circuit. Common to these hot water storage type hot water heaters is to store hot water in a hot water storage tank, and then supply hot water from the hot water storage tank to a hot water supply terminal for use.

In the upper part of the hot water storage tank, a hot water supply pipe that supplies hot water to a hot water supply terminal such as a faucet and a shower and a hot water supply pipe that supplies high temperature water to the bathtub are provided independently, and according to the requirements of each terminal, Hot water and water were mixed at an appropriate temperature with a mixing valve, and hot water was supplied. Moreover, the supply of water to a hot water / hot water mixing device that supplies hot water to a hot water supply terminal and a hot water / water mixing device that supplies hot water to a bathtub is generally branched from a single water supply pipe to supply water. (For example, see Patent Document 1).
JP 2005-134028 A

  However, in the above-described conventional configuration, the water supply to the hot water / hot water mixing device and the bathtub / hot water mixing device is branched from one water supply pipe to supply water, and generally the hot water outlet of the hot water supply terminal. While the flow rate is 5 to 10 L / min, the hot water flow rate to the bathtub is around 15 L / min, so when hot water is poured out from the hot water supply terminal, Since the amount of water supplied to the hot water / hot water mixing device instantaneously decreases, the temperature of the hot water discharged from the hot water supply terminal rises and the user feels hot and has a problem in usability.

  In particular, when a hot water storage tank and a bath are installed close to each other, while a kitchen with a faucet is installed remotely, the piping resistance on the bath side decreases relative to the kitchen side due to the difference in pipe length. The hot water flow rate of the bath is further increased as compared with the tap water flow rate of the faucet. As a result, when bath water is started during taping from a faucet or the like, there is a problem in that the tap water temperature rises and becomes hot water. Moreover, in the region where the dynamic pressure of the tap water pressure flowing into the water supply pipe is high, the above-described phenomenon is further increased and the usability is poor.

  The present invention solves the above-described conventional problems, and provides a stable hot water storage type water heater with little fluctuation in the temperature of hot water discharged from a hot water supply terminal even when hot water filling to a bathtub is started while the hot water supply terminal is used. The purpose is to provide.

In order to solve the above-described conventional problems, a hot water storage type water heater of the present invention includes a hot water storage tank for storing hot water, a first water supply pipe for supplying water to the hot water storage tank, and hot water from the hot water storage tank. A first hot water supply pipe that supplies water, a second water supply pipe that branches from the water supply pipe and supplies water to the hot water supply terminal, and a hot water supply that connects and mixes the first hot water supply pipe and the second water supply pipe A hot water mixer, a second hot water pipe that takes hot water from the hot water storage tank and supplies it to the bathtub, a third water pipe that branches from the water pipe and supplies water to the bathtub, the second hot water pipe, and the A bathtub hot / cold water mixing device that connects and mixes with a third water supply pipe, a pouring valve that supplies hot water to the bathtub, a bathtub flow rate detecting means that detects a flow rate of hot water supplied to the bathtub, and the hot water / hot water Control unit for controlling valve opening of mixing device and bathtub hot water mixing device The control unit learns the hot water flow rate to the bathtub from the past results of hot water filling to the bathtub, and learns when the hot water filling from the hot water supply terminal starts hot water filling to the bathtub. The opening degree of the hot water / hot water mixing device is controlled according to the hot water flow rate to the bathtub.

  By this, even if it is under different conditions for each house, such as bath and kitchen installation conditions and water pressure conditions, by learning the bath water flow rate from the use of the bath water beam reflecting the conditions of each house, When bath hot water is started during hot water from a shower or faucet, etc., hot water and hot water mixing equipment is controlled according to the learning value, so stable hot water with little fluctuation in hot water temperature is showered in each installed house. Or it can supply to a faucet.

  The hot water storage type water heater of the present invention can provide a stable hot water storage type water heater with little fluctuation in the temperature of hot water discharged from the hot water supply terminal even if the hot water filling to the bathtub is started while the hot water supply terminal is being used. .

  A hot water storage type hot water supply apparatus according to a first aspect of the invention is a hot water storage tank for storing hot water, a first water supply pipe for supplying water to the hot water storage tank, and a first hot water discharge pipe for taking out hot water from the hot water storage tank and supplying it to a hot water supply terminal. A second water supply pipe that branches from the water supply pipe and supplies water to the hot water supply terminal, a hot water and hot water mixing apparatus that connects and mixes the first hot water discharge pipe and the second water supply pipe, and the hot water storage tank A second hot water supply pipe for taking out hot water from the water supply to the bathtub, a third water supply pipe branched from the water supply pipe to supply water to the bathtub, and the second hot water discharge pipe and the third water supply pipe connected to each other A hot and cold water mixing device, a pouring valve for supplying hot water to the bathtub, a bathtub flow rate detecting means for detecting a flow rate of hot water to be supplied to the bathtub, the hot water and hot water mixing device, and the hot and cold water mixing device A control unit for controlling the valve opening of the While learning the hot water flow rate to the bathtub from the results of hot water filling to the bathtub, and starting hot water filling to the bathtub while hot water is discharged from the hot water supply terminal, according to the learned hot water flow rate to the bathtub, By controlling the opening degree of the hot water and hot water mixing device, even if the conditions differ from house to house such as bath and kitchen installation conditions and water pressure conditions, the results of using bath water that reflects the conditions of each house By learning the hot water flow rate from the shower, the hot water hot water mixing device is controlled according to the learning value when the hot water hot water is started during the hot water from the shower or faucet, etc., in each installed house Stable hot water with little fluctuation in the hot water temperature can be supplied to the shower or faucet.

  That is, the previous bath water flow rate detected by the bath flow sensor is stored in the control unit as a learning value, and the preset threshold value of the bath water flow rate that affects the temperature fluctuation of the hot water from a shower or faucet is set. If the learning value is less than the threshold value when the magnitude of the learning value is determined and the bath water is poured during showering from a shower or faucet, the hot water and hot water mixing device performs normal hot water mixing control, If the learning value is greater than or equal to the threshold value, the hot water and hot water mixing device performs hot water and water mixing control with a large bath hot water flow rate setting. Since the hot water / water mixing control of the hot water / hot water mixing device is performed according to the learning value as described above, stable hot water with little fluctuation in the hot water temperature can be supplied to the shower or the faucet.

  The hot water storage type water heater of the second aspect of the invention is the first aspect of the invention, in particular, the learning value of the hot water flow rate to the bathtub is operated independently of hot water filling to the bathtub without discharging hot water from the hot water supply terminal. The learning value of the bath water flow rate is calculated based on the actual usage of the bath water flow when using the bath alone, that is, when the bath flow sensor is activated and the hot water flow sensor is not activated. By calculating from the actual usage, stable bath water flow rate can be detected, threshold value and learning value can be determined accurately, and stable hot water with little fluctuation in tapping temperature can be supplied to the shower or faucet. .

The hot water storage type hot water heater of the third invention is the hot water storage type hot water supply machine of the third invention, particularly in the first or second invention, when the learning value of the hot water flow rate to the bathtub is equal to or greater than a predetermined value, When hot water filling is started, the opening ratio of the hot water / hot water mixing device is opened to the water side by a predetermined angle.

  When the learning value of the bath water flow rate is equal to or higher than a predetermined threshold value, for example, when the bath water flow rate is 17 (L / min) or more, the hot water of the hot water hot water mixing device is set to a large value. As mixing control, when bath water is started during hot water from a shower or faucet etc., the opening ratio of the hot water and hot water mixing device is opened to the water side by a predetermined angle, thereby increasing the amount of water and preventing the hot water temperature from rising. Stable hot water with little fluctuation in the temperature of the hot water can be supplied to the shower or faucet.

  The hot water storage type water heater according to the fourth aspect of the present invention is the average value of the results of hot water filling to the most recent multiple times of the bathtub. It is characterized by renewing before filling the bathtub.

  The learning value of the bath water flow rate should be calculated by updating the average value for each bath water beam from the most recent bath water beam usage before starting bath water during the hot water from the shower or faucet. Therefore, even in areas where the dynamic pressure of tap water flowing into the water supply pipe fluctuates and the dynamic pressure is unstable, the most recent average bath water flow rate is newly rewritten to be the learned value, thus providing higher reliability. The learning value and the threshold value can be determined, and stable hot water with little fluctuation of the hot water temperature can be supplied to the shower or the faucet.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a diagram of a hot water storage type water heater in an embodiment of the present invention. In FIG. 1, the hot water storage type water heater includes a heat source unit 4 and a hot water storage unit 17. The heat source unit 4 includes a circuit in which a heat source unit 2 such as a compressor that compresses a circulating refrigerant to obtain a high temperature and a heat exchanging unit 3 are connected. For example, carbon dioxide refrigerant circulates in the circuit.

  Inside the hot water storage unit 17 covered with the casing, there are a hot water storage tank 1, a water supply pipe 5 for supplying tap water from the lower part of the hot water storage tank 1, and a circulation pump for supplying water from the lower part of the hot water storage tank 1 to the heat exchange unit 3. 6 and a circulation channel 7 for supplying heated hot water to the upper part of the hot water storage tank 1. The hot water supply circuit mixes the first hot water pipe 12A for taking hot water from the upper part of the hot water storage tank 1, the hot water from the hot water storage tank 1 and the water from the first hot water supply pipe 5, and supplies hot water at a predetermined temperature to the shower 9 or faucet. 8 is provided with a hot water / hot water mixing device 10 to be supplied to 8 and a hot water flow rate sensor 21 for detecting the amount of hot water discharged from the shower 9 or the faucet 8, and the bath circuit further includes a second hot water pipe 12 B for taking hot water from the upper part of the hot water storage tank 1, and hot water storage The hot water from the tank 1 and the water from the water supply pipe 5 are mixed, and the hot and cold water mixing device 11 for supplying hot water with a predetermined temperature to the bath 14, the pouring valve 20 for turning on and off the bath water, and the bath water beam A bath flow sensor 19 for detecting the flow rate is provided.

  The hot water / hot water mixing device 10 is connected to a first hot water pipe 12A and a second water supply pipe 51 branched from the first water supply tube 5, and the bathtub hot water / water mixing device 11 is connected to the second hot water. The pipe 12B and a third water supply pipe 52 branched from the first water supply pipe 5 are connected.

  The operation and action of the hot water storage water heater configured as described above will be described below.

First, the heating operation for supplying hot water to the hot water storage tank 1 will be described. When the boiling operation is started by the operation unit 16, the heat source unit 2 configured by the heat pump system in the heat source unit 4 supplies the refrigerant to the heat exchange unit 3 while raising the refrigerant temperature. On the other hand, in the circulation channel 7, the circulation pump 6 is driven, and water in the lower part of the hot water storage tank 1 flows into the heat exchanging unit 3, where heat is exchanged from the refrigerant to the water, and the water becomes hot water and becomes a hot water storage tank. 1 is supplied.

  Next, the hot water and bath hot water operation of the shower 9 or the faucet 8 will be described. When the hot water temperature is set by the operation unit 16 and the hot water of the shower 9 or the faucet 8 is started, the hot water flow rate sensor 21 detects the hot water flow rate, and the hot water and hot water mixing device 10 is based on the valve opening control from the control unit 18, Hot water from the hot water storage tank 1 and water from the water supply pipe 5 are mixed with hot water having a predetermined temperature and supplied to the shower 9 or the faucet 8. Also, when the bath temperature is set by the operation unit 16 and the hot water bathing is started, the pouring valve 20 is opened, the bath flow rate sensor 19 detects the bath hot water flow rate, and the bathtub hot water mixing device 11 is supplied from the control unit 18. Based on the valve opening control, hot water from the hot water storage tank 1 and water from the water supply pipe 5 are mixed with hot water of a predetermined temperature and supplied to the bath 14.

  Next, a description will be given of a case where a hot water bath is applied during hot water from the shower 9 or the faucet 8 or the like. When hot water is started from the shower 9 or the faucet 8 or the like, the hot water and hot water mixing device 10 mixes hot water from the hot water storage tank 1 and water from the water supply pipe 5 into hot water of a predetermined temperature. When started, the amount of water supplied in the water supply pipe 5 becomes the relationship of bathtub hot water mixing device 11> hot water hot water mixing device 10 from the relationship of bath hot water flow rate> shower or faucet hot water flow rate. The amount of water in the apparatus 10 decreases, and the temperature of the hot water from the shower or faucet rises. The piping length of the hot water storage unit 17 and the bath 14 compared to the piping length of the hot water storage unit 17 and the faucet 8 on the kitchen side: The shorter L is installed, the smaller the piping resistance of the bath side is compared to the kitchen side. Therefore, the hot water flow rate of the bath is further increased as compared with the tap water flow rate of the faucet, and the rise of the hot water temperature becomes more remarkable.

  Thus, since the piping lengths of the hot water storage unit and the bath vary depending on the house to be installed, optimal hot water mixing control with less hot water temperature fluctuation is desired for each installed house. Therefore, the previous bath water flow rate detected by the bath flow sensor 19 is stored as a learning value in the control unit 18 and the preset threshold value of the bath water flow rate affecting the temperature fluctuation of the hot water from a shower or a faucet. If the learning value is equal to or less than the threshold value when the hot water is poured into the hot water from the shower 9 or the faucet 8 or the like, the hot water and hot water mixing device 10 performs normal hot water mixing. If the learning value is equal to or greater than the threshold value, the hot water / hot water mixing device 10 performs hot water / water mixing control with a large bath water flow rate setting. Since the hot water / water mixing control of the hot water / hot water mixing device 10 is performed according to the learning value as described above, stable hot water with little fluctuation of the hot water temperature can be supplied to the shower or the faucet.

  In the case of simultaneous use of a shower or a faucet and a bath, the respective flow rates interfere with each other and the bath hot water flow rate is not stable. Therefore, the learning value of the bath hot water flow rate is obtained when the bath is used alone, that is, the bath flow rate sensor 19. Is activated and the bath water flow rate sensor 21 is not activated to calculate the bath water flow rate so that a stable bath water flow rate can be detected and the threshold value and the learning value can be accurately determined. Stable hot water with little fluctuation in the hot water temperature can be supplied to the shower or faucet.

  When the learning value of the bath water flow rate is equal to or greater than a predetermined threshold, for example, when the bath water flow rate is 17 (L / min) or more, the bath water flow rate of the hot water / hot water mixing device 10 is large. As hot water mixing control set, when bath hot water is started during showering from the shower 9 or the faucet 8 or the like, the opening ratio of the hot water / hot water mixing device 10 is opened to the water side by a predetermined angle, thereby increasing the amount of water and leaving the hot water. It is possible to prevent a rise in temperature and supply stable hot water with little fluctuation in the hot water temperature to a shower or a faucet.

In addition, the learning value of the bath water flow rate is calculated by updating the average value of multiple times for each bath hot water using the latest bath hot water usage before starting bath water during the hot water from the shower or faucet. By changing the dynamic pressure of the tap water pressure flowing into the water supply pipe and the area where the dynamic pressure is unstable, the most recent average bath water flow rate can be rewritten as a learning value to make it more reliable. It is possible to determine a learning value and a threshold value that are high, and it is possible to supply stable hot water with little fluctuation in the hot water temperature to a shower or a faucet.

  As described above, the hot water storage type water heater according to the present invention can be applied to any water heater having a hot water storage tank such as an electric water heater or a heat pump type hot water heater.

The figure of the hot water storage type water heater in embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Heat source part 3 Heat exchange part 4 Heat source unit 5 Water supply pipe 8 Faucet 9 Shower 10 Hot water hot water mixing apparatus 11 Bath hot water mixing apparatus 12A Hot water pipe 12B Hot water pipe 14 Bath 18 Control part 19 Bath flow sensor 20 Injection valve 21 Hot water flow rate sensor

Claims (4)

A hot water storage tank for storing hot water, a first water supply pipe for supplying water to the hot water storage tank, a first hot water discharge pipe for taking out hot water from the hot water storage tank and supplying the hot water supply terminal, and a branch from the water supply pipe to the hot water supply terminal A second water supply pipe for supplying water, a hot water and hot water mixing device for connecting and mixing the first hot water discharge pipe and the second water supply pipe, and a second water supply for taking out hot water from the hot water storage tank and supplying it to the bathtub A hot water pipe, a third water supply pipe that branches from the water supply pipe and supplies water to the bathtub, a bathtub hot water mixing apparatus that connects and mixes the second hot water pipe and the third water supply pipe, and the bathtub A hot water supply valve for supplying hot water, a bathtub flow rate detecting means for detecting a flow rate of hot water supplied to the bathtub, a hot water / hot water mixing device, and a controller for controlling the valve opening of the bathtub / hot water mixing device. Equipped with the control unit, the bathtub from the past hot water filling to the bathtub When the hot water filling to the bathtub is started while the hot water is discharged from the hot water supply terminal, the opening degree of the hot water and hot water mixing device is adjusted according to the learned hot water flow rate to the bathtub. A hot water storage type water heater characterized by controlling. The learning value of the hot water flow rate to the bathtub is calculated from the actual use when the hot water filling to the bathtub is operated independently without discharging hot water from the hot water supply terminal. The hot water storage water heater described in 1. When the learning value of the hot water flow rate to the bathtub is equal to or greater than a predetermined value, when the hot water filling from the hot water supply terminal is started and hot water filling to the bathtub is started, the opening ratio of the hot water / hot water mixing device is predetermined to the water side. The hot water storage type hot water supply device according to claim 1 or 2, wherein the hot water storage type water heater opens at an angle. The learning value of the hot water flow rate to the bathtub is an average value of the hot water filling results for the most recent multiple times of the bathtub, and is updated before the hot water filling to the bathtub. The hot water storage type water heater according to claim 1.

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