JP3871058B2 - Electric water heater - Google Patents

Description

  The present invention relates to an electric water heater that supplies hot water by controlling the temperature of boiling water.

FIG. 1 is a configuration diagram of an electric water heater according to the present invention, but since the configuration of the prior art is substantially the same, the configuration of the conventional electric water heater will be described below using the configuration diagram according to the present invention. First, the electric hot water mixing valve 4 is controlled to adjust the amount of hot water in the hot water tank 1 and the water from the water source, and the temperature detected by the second temperature sensor 21 is preset by the kitchen remote controller 22 or the bathroom remote controller 23. Make sure that the temperature of the hot water is high. Thus, the hot water having reached the set temperature passes through the mixed hot water supply pipe 12 and is supplied from the hot and cold water mixing taps 5 and 6 provided in the kitchen and bathroom.
Related prior art includes the following (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2-195150 (page 2, page 3, FIGS. 1 to 4)

According to the electric water heater configured as described above, when the priority of determining the hot water temperature is changed, the hot water temperature changes and the hot water temperature changes suddenly.
Moreover, the hot water / water mixing tap 6 on the bathroom side often uses a thermostat type mixing tap, and the characteristic of the mixing tap side is that the temperature of hot water supplied to the mixing tap is 5 ° C. to 10 ° C. higher than the hot water temperature actually used. Since the hot water temperature is stabilized by increasing the temperature, the hot water temperature when using it in a shower or the like does not want to be changed so much. However, the hot water temperature is easily changed in the kitchen, etc., and there is a problem in usability such that it is necessary to transfer the priority to the bathroom side to return to the set temperature of the bathroom.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an electric water heater having a hot water temperature control function that is easy to use with little fluctuation in hot water temperature.

The electric water heater according to the present invention has the priority to set the hot water temperature when the power is turned on, among the bathroom remote controller and the kitchen remote controller, by the control unit that controls the hot water temperature of the electric hot water mixing valve, and it is intended to be automatically set when the power is turned on at the set temperature of the hot water supply water temperature of the bath remote controller.

In electric water heater according to the present invention, the control unit, out of the bathroom remote controller and kitchen remote control has a priority bathroom remote control to set the hot water temperature at the time of power-on, and the hot water supply water of the bathroom remote controller during the power-up Since the temperature is automatically set to the set temperature, it is possible to obtain an electric water heater having a hot water temperature control mechanism that is easy to use with little fluctuation of the hot water temperature.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram according to the electric water heater of the first embodiment of the present invention. Reference numeral 1 denotes a hot water storage tank for storing water and hot water, and reference numeral 2 denotes a heating element provided at the lower part of the hot water storage tank 1 for heating and boiling water in the hot water storage tank 1. Reference numeral 3 denotes a first temperature sensor that is provided on the outer periphery of the lower part of the hot water tank 1 and detects the boiling state of water in the hot water tank 1.
4 is an electric hot and cold water mixing valve for changing the mixing ratio of water and hot water by electric control to produce hot water with appropriate temperature. 5 is a kitchen hot / cold mixing tap attached to the kitchen, 6 is a bathroom hot / water mixing tap attached to the bathroom, the kitchen hot / water mixing tap 5 is, for example, a one-lever type, and the bathroom water / water mixing tap 6 is, for example, a mixing tap with a thermostat. Is used.

  7 is a hot water supply pipe for supplying one end attached to the upper part of the hot water storage tank 1 and the other end to a hot water outlet of the electric hot water mixing valve 4 to supply hot water heated in the hot water storage tank 1 to the electric hot water mixing valve 4. It is a water supply pipe for connecting one end to a water source such as a water pipe and attaching the other end to a water supply port of the electric hot water mixing valve 4 to supply water from the water source to the electric hot water mixing valve 4. Reference numeral 11 denotes a hot water storage tank water supply pipe for supplying water in the hot water supply tank 10 into the hot water storage tank 1, which is branched from the water supply pipe 10 and attached to the lower part of the hot water storage tank 1.

  Reference numeral 12 denotes a mixed hot water pipe having one end attached to the mixed hot water outlet of the electric hot / cold water mixing valve 4, and 13 and 14 branch from the mixed hot water pipe 12, and the ends are attached to the kitchen hot water mixing tap 5 and the bathroom hot water mixing tap 6 respectively. Kitchen hot water pipe and bathroom hot water pipe. 15 is a mixing tap water supply pipe branched from the water supply pipe 10, and 16 and 17 are a kitchen water supply pipe and a bathroom water supply branching from the mixing tap water supply pipe 15 and having ends attached to the kitchen hot water mixing tap 5 and the bathroom hot water mixing tap 6, respectively. It is a tube.

18 is a pressure reducing valve attached to the hot water tank water supply pipe 11 for reducing the water source pressure, and 19 is a hot water pipe 7 attached near the upper part of the water tank 1 to escape the hot water in the hot water tank 1 which has been volume-expanded during boiling. It is a valve.
Reference numeral 20 denotes a water flow detecting means for detecting the flow rate of the mixed hot water flowing in the mixed hot water supply pipe 12, and reference numeral 21 denotes a hot water flowing in the mixed hot water pipe 12 attached to the mixed hot water pipe 12 in order to perform temperature correction by the electric hot water mixing valve 4. It is the 2nd temperature sensor which detects temperature.

  22 is a kitchen remote controller attached near the kitchen hot water mixer tap 5, and 23 is a bathroom remote controller attached near the bathroom hot water mixer tap 6. Reference numeral 24 denotes a kitchen remote control priority switch operated when giving priority to the kitchen remote controller 22, and reference numeral 25 denotes a bathroom remote control priority switch operated when giving priority to the bathroom remote control 23. By pressing each priority switch, It is possible to give priority to the pressed remote controller. Accordingly, the hot water temperature can be changed only from a remote controller having priority, and the hot water temperature cannot be changed from a remote controller not having priority.

  A control device 26 controls the entire electric water heater. The control device 26 receives signals from the first and second temperature sensors 3 and 21, the water flow detection means 20, the kitchen remote controller 22, and the bathroom remote controller 23, and the heating element 2 and electric hot water. The mixing valve 4 and the like are controlled. In this control device 26, the bathroom remote controller 23 has priority over the kitchen remote controller 22. Even when the hot water temperature is changed by the kitchen remote controller 22 having priority, the bathroom remote controller 23 It returns to the set temperature.

  That is, when the priority is switched from the bathroom remote controller 23 to the kitchen remote controller 22, the hot water temperature is returned to the set temperature of the bathroom remote controller 23 again after a certain time, but the priority is given from the kitchen remote controller 22 to the bathroom remote controller 23. When switched, the hot water temperature is switched to the temperature set in the bathroom remote controller 23. Note that priority is given to the bathroom remote controller 23 when the power is turned on, and the hot water temperature can be changed from the bathroom remote controller 23, but the hot water temperature cannot be changed from the kitchen remote controller 22.

  The operation of the first embodiment configured as described above will be described with reference to FIG. The water sent from the water source to the hot water tank water supply pipe 11 is reduced in pressure through the pressure reducing valve 18 and flows into the hot water tank 1, and the hot water tank 1 is always maintained in a full state. In this state, when the heating element 2 is energized using, for example, midnight power, the water in the hot water tank 1 is heated. And if the 1st temperature sensor 3 detects the preset boiling temperature, electricity supply of the heat generating body 2 will be stopped. The hot water in the hot water tank 1 expanded by heating is drained from the relief valve 19.

  Thus, hot water and water source water stored in the hot water tank 1 reach the electric hot water mixing valve 4 through the hot water supply pipe 7 and the water supply pipe 10, respectively, and here, a second temperature sensor attached to the mixed hot water supply pipe 12 The mixing ratio of hot water and water is controlled so that the detected temperature 21 becomes a temperature preset by the kitchen remote controller 22 (or the bathroom remote controller 23). At this time, the water flow detection means 20 detects whether or not hot water is flowing through the mixed hot water supply pipe 12, and only when the flow of hot water is detected, feedback to the electric hot water mixing valve 4 by the detected temperature of the second temperature sensor 21. Take control.

  In determining the temperature of hot water detected by the second temperature sensor 21, if the kitchen priority switch 24 is pressed, the kitchen remote controller 22 can be given priority, and at this time, hot water is supplied only from the kitchen remote controller 22. The hot water temperature cannot be changed from the bathroom remote controller 23 that can change the temperature and does not have priority. In addition, when the bathroom priority switch 25 is pressed, the bathroom remote controller 23 can be given priority, the hot water temperature can be changed only from the bathroom remote controller 23, and the kitchen remote controller 22 without priority is given. Can not change the hot water temperature. The mixed hot water at a desired temperature is supplied through the mixed hot water supply pipe 12 and through the hot water mixing plugs 5 and 6.

The above operation will be described in more detail with reference to the flowchart of FIG. First, when the initial power is turned on, the priority at the time of power-on is on the bathroom remote controller 23 side. When the power is turned on, for example, the hot water temperature is set to 50 ° C.
Thus, the priority on the side of the bathroom remote controller 23 is turned ON, the current hot water temperature is 50 ° C., and the set value of the hot water temperature is 50 ° C. On the other hand, the priority of the kitchen remote controller 22 is turned off, and the current hot water temperature is 50 ° C. (step S-1). Thus, since the priority at the time of power-on is on the bathroom remote controller 23 side, the hot water temperature can be changed from the bathroom remote controller 23 side, but the hot water temperature cannot be changed from the kitchen remote controller 22 side. Thus, when the kitchen hot / cold mixing tap 5 and the bathroom hot / cold mixing tap 6 are opened, hot water of 50 ° C. is supplied from here.

  Next, when the priority switch 24 of the kitchen remote controller 22 is pressed (step S-2), the priority is transferred from the bathroom remote controller 23 to the kitchen remote controller 22. Thus, the priority of the bathroom remote controller 23 is turned off, the current hot water temperature is 50 ° C., and the set value of the hot water temperature is 50 ° C. On the other hand, the priority of the kitchen remote controller 22 is turned ON, and the current hot water temperature is 50 ° C. (step S-3). Thus, since the priority has shifted to the kitchen remote controller 22 side, the hot water temperature can be changed from the kitchen remote controller 22, but the hot water temperature cannot be changed from the bathroom remote controller 23 side. Thus, when the kitchen hot / cold mixing tap 5 and the bathroom hot / cold mixing tap 6 are opened, hot water of 50 ° C. is supplied from here.

  Next, when the kitchen remote controller 22 is operated to change the hot water temperature from 50 ° C. to, for example, 70 ° C. (step S-4), the priority of the bathroom remote controller 23 is turned off, and the current hot water temperature is 70 ° C. Thus, the set value of the hot water temperature is 50 ° C. On the other hand, the priority of the kitchen remote controller 22 is ON, and the current hot water temperature is 70 ° C. (step S-5). In this state, since the priority is on the kitchen remote controller 22 side, the hot water temperature can be changed from the kitchen remote controller 22 side, but the hot water temperature cannot be changed from the bathroom remote controller 23 side. Thus, the hot water temperature is 70 ° C., and the temperatures of the hot water supplied from the kitchen hot water mixing tap 5 and the bathroom hot water mixing tap 6 are both 70 ° C.

  After the hot water temperature is changed to 70 ° C. by the kitchen remote controller 22, for example, it is checked whether or not 10 minutes have passed (step S-6). When 10 minutes have elapsed, the hot water temperature is automatically returned to 50 ° C. For this reason, the priority of the bathroom remote controller 23 is OFF, the current hot water temperature is 50 ° C., and the set value of the hot water temperature is 50 ° C. On the other hand, the priority of the kitchen remote controller 22 is ON, and the current hot water temperature becomes 50 ° C. (step S-7). Thus, the hot water temperature returns to 50 ° C., and the kitchen hot water mixing tap 5 and the bathroom hot water mixing tap. The temperature of the hot water supplied from 6 is 50 ° C.

  Next, when the priority switch 25 of the bathroom remote controller 23 is pressed (step S-8), the priority is transferred from the kitchen remote controller 22 to the bathroom remote controller 23. Thereby, the priority of the bathroom remote controller 23 is turned ON, the current hot water temperature is 50 ° C., and the set value of the hot water temperature is 50 ° C. On the other hand, the priority of the kitchen remote controller 22 is turned off, and the current hot water temperature is 50 ° C. Since the priority has moved to the bathroom remote controller 23 side, the hot water temperature can be changed from the bathroom remote controller 23, but the hot water temperature cannot be changed from the kitchen remote controller 22 side (step S-9). Thus, the hot water temperature remains at 50 ° C., and the temperature of the hot water coming out of the kitchen hot water mixing tap 5 and the bathroom hot water mixing tap 6 is 50 ° C.

  Next, when the priority switch 24 of the kitchen remote controller 22 is pressed (step S-10), the priority is transferred from the bathroom remote controller 23 to the kitchen remote controller 22. Accordingly, the priority of the bathroom remote controller 23 is turned off, the current hot water temperature is 50 ° C., and the set value of the hot water temperature is 50 ° C. On the other hand, the priority of the kitchen remote controller 22 is turned ON, and the current hot water temperature is 50 ° C. Since the priority has shifted to the kitchen remote controller 22 side, the hot water temperature can be changed from the kitchen remote controller 22, but the hot water temperature cannot be changed from the bathroom remote controller 23 side (step S-11). Thus, the hot water temperature remains at 50 ° C., and the temperatures of the hot water coming out of the kitchen hot / cold mixing tap 5 and the bathroom hot / cold mixing tap 6 are both 50 ° C.

In the first embodiment, when the priority is switched from the bathroom remote controller 23 to the kitchen remote controller 22 to change the hot water temperature, even if the kitchen remote controller retains the priority and the bathroom remote controller does not have the priority after a certain time. When the set temperature is changed by switching the priority from the kitchen remote controller 22 to the bathroom remote controller 23 so that the hot water temperature returns to the set temperature of the bathroom remote controller 23, the temperature set in the bathroom remote controller 23 is set. Since the temperature is switched to, the temperature of the hot water in the shower can be stabilized and the usability is improved.

Embodiment 2. FIG.
FIG. 3 is a flowchart showing the operation of the second embodiment. In the first embodiment, when the set temperature of the bathroom remote controller 23 is prioritized and the hot water temperature is changed in the kitchen remote controller 22, the temperature is returned to the set temperature of the bathroom remote controller 23 after a certain period of time. Then, when the water flow detecting means 20 attached to the mixed hot water supply pipe 12 is used and the set temperature of 23 is given priority to the bathroom remote controller, and the hot water temperature is changed by the kitchen remote controller 22, the water flow detection by the water flow detecting means 20 is completed. At this time, the temperature is returned to the set temperature of the bathroom remote controller 23. That is, when the priority is switched from the bathroom remote controller 23 to the kitchen remote controller 22 and the hot water temperature is changed, the hot water temperature is returned to the set temperature of the bathroom remote controller 23 when the water flow detection is completed. When the priority is switched from the remote controller 22 to the bathroom remote controller 23 and the hot water temperature is changed, the set temperature is switched to the temperature set in the bathroom remote controller 23.

  For example, in the first embodiment, as shown in FIG. 2, the priority is transferred to the kitchen remote controller 22 side (step S-2), and the hot water temperature is changed from 50 ° C. to 70 ° C. (step S-4). ) After 10 minutes (step S-6), the priority is maintained on the kitchen remote controller 22 side and automatically returns to 50 ° C. which is the set temperature of the bathroom remote controller 23 (step S-). 7).

  On the other hand, in the second embodiment, as shown in FIG. 3, instead of the passage of time, the presence or absence of water flow is detected using the water flow detection means 20, and the priority is given to the kitchen remote controller 22. Even when the hot water temperature is changed from 50 ° C. to 70 ° C. (step S-4), the water flow flowing through the mixed hot water supply pipe 12 is detected by the water flow detection means 20, and the water flow Whether or not the detection is completed is detected (step S-6), and after the water flow is detected, the priority is maintained on the kitchen remote controller 22 side, and automatically returns to 50 ° C. which is the set temperature of the bathroom remote controller 23. (Step S-7). That is, hot water is supplied once in the kitchen, and when the hot water supply is finished, the temperature is returned to the original hot water temperature.

In the second embodiment, when the priority is switched from the bathroom remote controller 23 to the kitchen remote controller 22 to change the set temperature, the kitchen remote controller retains the priority and the bathroom remote controller has the priority when the water flow detection is completed. Even if there is not, when the hot water temperature returns to the set temperature of the bathroom remote controller 23 and the priority is switched from the kitchen remote controller 22 to the bathroom remote controller 23 and the set temperature is changed, the hot water temperature is set in the bathroom remote controller 23. Since the temperature is switched to the normal temperature, it is possible to stabilize the hot water temperature of the shower and the like, and the usability is improved.

Embodiment 3 FIG.
FIG. 4 is a flowchart showing the operation of the third embodiment. In the first embodiment, when the set temperature of the bathroom remote controller 23 is prioritized and the hot water temperature is changed in the kitchen remote controller 22, the temperature is returned to the set temperature of the bathroom remote controller 23 after a certain time. Then, when the priority switch is switched and the priority is moved from the bathroom remote controller 23 to the kitchen remote controller 22, the hot water temperature is not changed. That is, even when the priority is switched from the bathroom remote controller 23 to the kitchen remote controller 22, the hot water temperature is kept unchanged, and when the priority is switched from the kitchen remote controller 22 to the bathroom remote controller 23, the set temperature is set to the bathroom remote controller. The temperature can be switched to the temperature set to 23.

  For example, in the first embodiment, as shown in FIG. 2, the priority is transferred to the kitchen remote controller 22 side (step S-2), and the hot water temperature is changed from 50 ° C. to 70 ° C. (step S-4). ) After 10 minutes (step S-6), the priority is maintained on the kitchen remote controller 22 side and automatically returns to 50 ° C. which is the set temperature of the bathroom remote controller 23 (step S-). 7).

On the other hand, in the third embodiment, as shown in FIG. 4, the priority is transferred to the kitchen remote controller 22 side (step S-2), and the hot water temperature is changed from 50 ° C. to 70 ° C. (step S2). S-4) The hot water temperature is not changed and is maintained at 50 ° C. (step S-3 and step S-7).
According to the third embodiment, even if the priority is switched from the bathroom remote controller 23 to the kitchen remote controller 22 to change the hot water temperature, the hot water temperature does not change. Temperature stability does not occur and the temperature of the hot water in the shower can be stabilized, improving usability.

It is a block diagram of Embodiment 1 of this invention. 3 is a flowchart showing the operation of the first embodiment. 10 is a flowchart showing the operation of the second embodiment. 10 is a flowchart showing the operation of the third embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water tank, 3 1st temperature sensor, 4 Electric hot / cold water mixing valve, 5 Kitchen hot / water mixing tap, 6 Bathroom hot / cold mixing tap, 20 Water flow detection means, 21 2nd temperature sensor, 22 Kitchen remote control, 23 Bathroom remote control, 24 Kitchen remote control priority switch, 25 Bathroom remote control priority switch, 26 Control unit.

Claims (3)

A hot water storage tank for heating and storing water, an electric hot water mixing valve for mixing hot water and water heated in the hot water storage tank, and a temperature of mixed hot water sent from the electric hot water mixing valve are detected. A temperature sensor, a temperature setting priority switch, a bathroom remote control and a kitchen remote control for switching the priority of setting the hot water temperature of the electric hot water mixing valve by operating the priority switch, the temperature sensor, the bathroom remote control, In the electric water heater having a control unit that receives a signal from the kitchen remote control and controls the hot water temperature of the electric hot water mixing valve,
Among the bathroom remote controller and kitchen remote controller, said bathroom remote controller has priority for setting the hot water temperature at the time of power-on, and is automatically set to the set temperature of the hot water supply water temperature of the bath remote controller during the power-up Features an electric water heater. A hot water storage tank for heating and storing water, an electric hot water mixing valve for mixing hot water and water heated in the hot water storage tank, and a temperature of mixed hot water sent from the electric hot water mixing valve are detected. A temperature sensor, a temperature setting priority switch, a bathroom remote control and a kitchen remote control for switching the priority of setting the hot water temperature of the electric hot water mixing valve by operating the priority switch, the temperature sensor, the bathroom remote control, In the electric water heater having a control unit that receives a signal from the kitchen remote control and controls the hot water temperature of the electric hot water mixing valve,
  Among the bathroom remote controller and kitchen remote controller, the bathroom remote controller has priority to set the hot water temperature when power is turned on, the kitchen remote controller is operated, and the priority is switched from the bathroom remote controller to the kitchen remote controller. When the hot water temperature is changed, the hot water temperature of the electric hot water mixing valve is set to the set temperature of the hot water temperature of the kitchen remote controller whose priority is switched. Even when the bathroom remote control has the priority to set the hot water temperature and the bathroom remote control does not have the priority to set the hot water temperature, the hot water temperature of the bathroom remote controller with the priority to set the hot water temperature when the power is turned on An electric water heater characterized by being set back to the set temperature. A hot water storage tank for heating and storing water, an electric hot water mixing valve for mixing hot water and water heated in the hot water storage tank, and the temperature and flow rate of the mixed hot water sent from the electric hot water mixing valve A temperature remote controller and a water flow detecting means, a temperature setting priority switch, a bathroom remote control and a kitchen remote control for switching the priority of setting the hot water temperature of the electric hot water mixing valve by operating the priority switch; In an electric water heater having a temperature sensor, a signal from the water flow detection means and the bathroom remote controller and a kitchen remote controller, and a controller for controlling the hot water temperature of the electric hot and cold mixing valve,
  Among the bathroom remote controller and kitchen remote controller, the bathroom remote controller has priority to set the hot water temperature when power is turned on, the kitchen remote controller is operated, and the priority is switched from the bathroom remote controller to the kitchen remote controller. When the hot water temperature is changed, the hot water temperature of the electric hot / cold water mixing valve is set to the set temperature of the hot water temperature of the kitchen remote controller whose priority is switched, but after the detection of the water flow by the water flow detection means Even if the kitchen remote control retains the priority to set the hot water temperature and the bathroom remote control does not have the priority to set the hot water temperature, the bathroom has the priority to set the hot water temperature when the power is turned on. An electric water heater characterized by being set back to the set temperature of the hot water temperature of the remote control.

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