JP5683829B2 - Hot water storage type electric water heater - Google Patents

Description

  The present invention relates to a hot water storage type electric water heater.

Conventionally, the hot water storage type electric water heater disclosed in Patent Document 1 is provided with a timer for measuring the elapsed time from the start of “automatic power saving”, and when the elapsed time exceeds a predetermined time, “automatic power saving” It is released and the heater is energized, and the hot water in the hot water storage tank is heated up, and it is possible to suppress the propagation of bacteria in the hot water in the hot water storage tank while performing "Energy Saving Power" .
Moreover, in the first-stop type hot water heater disclosed in Patent Document 2, air generated in the hot water storage tank is intermittently and forcibly discharged by the opening / closing means when boiling water, and reliable air venting is achieved. It is possible.

JP 2009-222258 A Japanese Patent Laid-Open No. 9-42768

In the configuration disclosed in Patent Document 1, the heater is energized to boil the hot water in the hot water storage tank when a predetermined time is exceeded even during power saving, but the drain pipe is provided with expanded water generated when the hot water is boiled. It does not flow to the open-type sealed water seal.
Moreover, in the structure currently disclosed by the said patent document 2, although the hot water discharged | emitted intermittently can be utilized as a water seal water of a drain outlet, it seems to interlock | cooperate with the power-saving control of a hot water storage water heater. It was not a proper structure.
That is, in the conventional hot water storage type electric water heater having an expansion water drain pipe that can discharge the expansion water from the hot water storage tank to the open-type sealed water portion, hot water is not boiled in the hot water storage tank during power saving control. The expansion water is not discharged to the open seal, the water inside the open seal evaporates and cannot be sealed, and the odor comes from the downstream side through the drainage pipe and the odor drifts indoors. There was a problem that it was.

An object of the present invention is to provide a hot water storage type electric water heater that can discharge expansion water to an open-type sealed water portion even during power saving control, and can prevent the open-type sealed water portion from running out of sealed water. The following measures were taken to achieve the part.
The present invention is a hot water storage type electric water heater equipped with an expansion water drain pipe capable of discharging the expansion water from the hot water storage tank to an open seal water section provided in the drain pipe,
The hot water storage type electric water heater is normally controlled so that the hot water temperature is within a predetermined range, and in the summer or when the usage frequency is low, the heater in the hot water tank is turned off or the temperature inside the hot water tank is lowered to save power. It is configured with a control circuit that performs control,
In the control circuit, even during the power saving control, the hot water is boiled in the hot water storage tank up to a constant temperature every predetermined period, and the expansion water is discharged from the hot water storage tank to the expansion water drain pipe. The gist is to perform control to return to control.

In the hot water storage type electric water heater of the present invention, hot water can be boiled in a hot water storage tank at regular intervals even during power saving control, and the expansion water can be discharged from the hot water storage tank to the expansion water drain pipe. Supplied to the sealed part.
Therefore, even if the sealed water in the open-type seal water is evaporated, the expanded water is supplied every certain period, so that the open-type seal water is well-opened and the odor from the drain pipe side is prevented. It is possible to surely prevent the rising.
Further, a power saving effect can be obtained by power saving control except that the hot water is boiled in the hot water storage tank at regular intervals.

In the hot water storage type electric water heater of the present invention, the constant temperature may be lower than a normal temperature at which hot water is boiled in a hot water storage tank.
By doing so, the hot water boiling temperature when discharging the expanded water every predetermined period is a low temperature, and hot water is not discharged even if it is used unintentionally by the user. There is nothing.

It is an outline appearance lineblock diagram of the state where the expansion water drain pipe of the electric water heater was connected to the drainage device of the drain pipe of the washbasin. It is a piping block diagram of the electric water heater which shows an example of the piping structure of FIG.

Next, the form for implementing this invention is demonstrated using an Example.
FIG. 1 is a schematic configuration diagram of a state where an expansion water drain pipe of an electric water heater is connected to a drainage device of a drain pipe of a basin, and FIG. 2 is a pipe of an electric water heater showing an example of the pipe configuration of FIG. It is a block diagram.
An electric water heater 1 having a hot water storage tank 11 in which hot water can be stored is connected to a water supply pipe 2 and a hot water supply pipe 3, and an expansion water drain pipe 8 extends from the electric water heater 1. The expansion water drain pipe 8 is connected to a drainage device 7 attached to the drain pipe 6 of the basin 5 via a joint 6b. Further, a branched water supply pipe 2a and a hot water supply pipe 3 from the electric water heater 1 are connected to a faucet 4 provided in the basin 5, and hot water is mixed in the faucet 4 from a water outlet 4a. It is configured to discharge water.

A water supply pipe 2 provided with a stop cock 16 and connected to a water pipe (not shown) enters the electric water heater 1 from the water supply port 11a, and the water supply pipe 2 is connected to an external water tap 4 in the electric water heater 1. It is branched into a connected water supply pipe 2 a and a water supply pipe 2 b connected to the lower end of the hot water storage tank 11.
Further, the hot water supply pipe 3 connected to the upper end of the hot water storage tank 11 is connected to the external faucet 4 from the hot water outlet 11b.
In addition, an expansion water drain pipe 8 that can discharge the expansion water generated when hot water is boiled in the hot water storage tank 11 is provided, and the expansion water drain pipe 8 is connected to a drainage device 7.

The drainage device 7 is connected to, for example, a drain pipe 6 of the basin 5 via a joint 6b, and an open trap-type sealing portion 7a is formed inside the drainage device 7, and this sealed water Sealing water is contained in the portion 7a, and this sealing portion 7a prevents the odor in the sewer pipe connected to the downstream side of the drain pipe 6 from rising and entering the room.
In addition, since the trap part 6a of the drain pipe 6 is separately formed in the upstream of the coupling 6b, the trap part 6a prevents the odor from rising, and the odor can enter the room from the basin 5. It is prevented.
In addition, since the sealing part 7a in this drainage device 7 is an open type, if the internal sealing water evaporates and disappears, the odor in a sewer pipe will enter into the room from this drainage device 7.

A water supply thermistor 9 is provided in the water supply pipe 2 to detect the water supply temperature, and a flow sensor 10 is provided in the water supply pipe 2b. This flow sensor 10 is an impeller-type water amount sensor and can detect the flow rate of water flowing in the water supply pipe 2b.
A heater 17 is built in the hot water storage tank 11, and a temperature control thermistor 12 and an overheating bimetal 13 are attached to the side surface of the hot water storage tank 11.
The temperature control thermistor 12 and the overheating bimetal 13 are connected to a control board 15 constituted by a control circuit, and the control board 15 is connected to an operation board 14. The operation board 14 is provided on the back side of the operation unit 1 a provided on the surface of the electric water heater 1.
Signals from the water supply thermistor 9 and the flow sensor 10 are input to the control board 15.

In such a configuration, when the faucet 4 is opened and water is discharged from the water outlet 4a, water flows into the hot water storage tank 11 through the water supply pipes 2 and 2b, and at the same time, the heater 17 in the hot water storage tank 11 is energized. Then, hot water is boiled in the hot water storage tank 11 by the heater 17, and hot water of 70 ° C. to 80 ° C. is normally boiled in the hot water storage tank 11 by the heater 17. Hot water is pushed into the hot water supply pipe 3 and supplied to the faucet 4.
In addition, when boiling water in the hot water storage tank 11, expansion water is generated due to an increase in pressure in the hot water storage tank 11, and this expansion water passes through the expansion water drain pipe 8 and is supplied to the sealing portion 7 a in the drainage device 7. It becomes the sealing water in the sealing part 7a.

  The temperature control thermistor 12 detects the temperature of the hot water in the hot water storage tank 11, and controls the energization of the heater 17 so that the control board 15 has a hot water temperature of 70 ° C. to 80 ° C. based on this. Further, when the hot water temperature in the hot water storage tank 11 reaches 90 ° C., the overheating bimetal 13 is activated to stop energization of the heater 17.

In the control board 15, learning for executing power saving control in the control board 15 is performed by detecting the feed water temperature and the flow rate of the feed water based on the signal from the feed water thermistor 9 and the signal from the flow sensor 10. When the water supply temperature is determined to exceed 30 ° C. by a signal from the water supply thermistor 9 in summer or the like, the control board 15 turns off the power to the heater 17 and executes power saving control. .
Further, the flow rate of the water supply is detected by a signal from the flow sensor 10, and the change in the flow rate of the water supply is learned, for example, for about three weeks, and the amount of water discharged from the faucet spout 4a, that is, the time when the amount of use is low Thus, the control board 15 is configured to perform power saving control by turning off the power to the heater 17 even when the usage frequency is low.

  In winter, in order to prevent freezing in the hot water storage tank 11, the heater 17 is turned on when the hot water in the hot water storage tank 11 reaches 4 ° C., and the heater 17 is turned off at 8 ° C. to freeze the hot water. The control board 15 is configured to control the hot water storage tank 11 so that the temperature can be prevented.

Thus, learning control is performed in the control board 15, and power saving control is performed to turn off the heater 17 in the hot water storage tank 11 in summer or when the usage frequency is low, or to keep the temperature low enough to prevent freezing in winter. Even at this time, the control board 15 is configured such that, for example, the heater 17 is energized every week, and the hot water is boiled in the hot water storage tank 11 at a temperature of about 40 ° C.
If the hot water is boiled in the hot water storage tank 11 at about 40 ° C. every week, the hot water storage tank 11 is in a full tank state, so even if the hot water is boiled at about 40 ° C., the pressure rises in the hot water storage tank 11. Expansion water is generated, and the expansion water passes through the expansion water drain pipe 8 and is discharged into the sealed portion 7 a of the drainage device 7.

Therefore, since the expanded water is supplied to the sealed water portion 7a every week, it is well prevented that the sealed water in the sealed water portion 7a disappears, and the odor rises indoors from the drain pipe 6 side. It is configured so that there is nothing.
That is, when the sealing water runs out due to the evaporation of the sealing water, the odor in the downstream sewage pipe passes through the sealing water portion 7a and enters the room. It is made to flow into the sealing part 7a of the drainage device 7 and to prevent the sealing part 7a from being closed well.

  In addition, when hot water is boiled in the hot water storage tank 11 at a constant temperature of about 40 ° C. for each predetermined period, when the water tap 4 is operated to discharge water from the water outlet 4a, In summer, when hot water comes out, there is a risk of burns, but even if hot water boiled to around 40 ° C comes out, it doesn't feel so hot, so the user gets burns. There is nothing.

  As described above, in the electric water heater 1 of this example, power saving control can be performed in summer or when the usage frequency is low, and the power saving effect can be improved satisfactorily. Hot water is boiled in the hot water storage tank 11, the expansion water is discharged from the hot water storage tank 11 to the expansion water drain pipe 8, and the expansion water is well stored in the sealing portion 7 a of the drainage device 7 to prevent the sealing water from running out. In addition, since the hot water is only boiled at a low temperature of about 40 ° C. when the hot water storage tank 11 is boiled in order to generate expanded water, the user is burned by water discharged from the water outlet 4a of the faucet. It will not be incurred.

  In addition, since good control can be performed by the control setting in the control board 15 as described above, it is not necessary to provide a valve or the like in the water supply pipe 2 or the hot water supply pipe 3, and the control of the control board 15 of the existing electric water heater 1 is controlled. The software can be changed at low cost.

DESCRIPTION OF SYMBOLS 1 Electric water heater 2,2a, 2b Water supply pipe 3 Hot water supply pipe 4 Water faucet 4a Water outlet 5 Wash basin 6 Drain pipe 7 Drainage device 7a Sealing part 8 Expansion water drain pipe 9 Water supply thermistor 10 Flow sensor 11 Hot water storage tank 12 Temperature control Thermistor 13 Excessive bimetal 15 Control board (control circuit)
17 Heater

Claims (2)

A hot water storage type electric water heater equipped with an expansion water drain pipe capable of discharging the expansion water from the hot water storage tank to an open seal water section provided in the drain pipe,
The hot water storage type electric water heater is normally controlled so that the hot water temperature is within a predetermined range, and in the summer or when the usage frequency is low, the heater in the hot water tank is turned off or the temperature inside the hot water tank is lowered to save power. It is configured with a control circuit that performs control,
In the control circuit, even during the power saving control, the hot water is boiled in the hot water storage tank up to a constant temperature every predetermined period, and the expansion water is discharged from the hot water storage tank to the expansion water drain pipe. A hot water storage type electric water heater characterized by performing control to return to control.   The hot water storage type electric water heater according to claim 1, wherein the constant temperature is lower than a normal temperature at which hot water is boiled in a hot water storage tank.

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