JP2009103334A - Storage water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage water heater of high safety, not supplying hot water of high temperature to a hot water supply terminal, even in an abnormal state such as locking of a hot water mixing valve. <P>SOLUTION: This storage water heater comprises a hot water storage tank 1 for storing hot water/water, a water inlet pipe 2 connected with a lower portion of the hot water storage tank 1, a water supply pipe 4 branched from an intermediate portion of the water inlet pipe 2, a hot water supply pipe 3 connected with an upper portion of the hot water storage tank 1, a mixing valve 5 connected with the water supply pipe 4 and the hot water supply pipe 3, a hot water supply pipe 6 connected with a downstream side of the mixing valve 5, a hot water temperature detecting device 9 detecting a temperature of the hot water flowing in the hot water supply pipe 6, a bypass pipe 7 connecting the water supply pipe 4 and the hot water supply pipe 3 in a state that a connecting position with the hot water supply pipe 6 is located at a downstream side with respect to the hot water temperature detecting device 9, and an opening/closing valve 8 disposed on the way of the bypass pipe 7, and the opening/closing valve 8 is opened when a state that the hot water temperature detected by the hot water temperature detecting device 9 is higher than a set temperature, is detected for a specific time. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hot water storage type water heater that adjusts the hot water temperature by a hot water mixing valve.

Conventional hot water storage water heaters that adjust the hot water temperature with a hot water mixing valve have a hot water supply pipe that supplies hot water at the top of the hot water storage tank and a water supply pipe that supplies low temperature water from the water supply source. It mixed so that it might become temperature, and the hot water was supplied to the hot water supply terminal (for example, refer patent document 1). FIG. 3 shows a configuration of a hot water storage type water heater that adjusts the temperature of the hot water with a conventional hot water temperature mixing valve described in Patent Document 1.
JP 2004-144315 A

  However, in the conventional configuration, when a failure such as a hot water mixing valve lock occurs, mixing with hot water at a set temperature cannot be performed. It had the subject of being supplied to a hot-water supply terminal as it is.

  The present invention solves the above-mentioned conventional problems, and even when a hot water mixing valve falls into an abnormal state such as a lock, a hot water storage type hot water heater that does not supply high-temperature hot water to a hot water supply terminal is provided. The purpose is to provide.

  In order to solve the conventional problems, a hot water storage water heater of the present invention includes a hot water storage tank for storing hot water, a water inlet pipe connected to a lower part of the hot water storage tank, a water supply pipe branched from the middle of the water inlet pipe, The hot water supply pipe connected to the upper part of the hot water storage tank, the mixing valve connected to the water supply pipe and the hot water supply pipe, the hot water supply pipe connected downstream of the hot water temperature mixing valve, and the temperature of the hot water flowing through the hot water supply pipe A hot water temperature detection device to detect, a bypass pipe that connects the water supply pipe and the hot water pipe and the connection position of the hot water pipe is downstream of the hot water temperature detection device, and an on-off valve provided in the middle of the bypass pipe, When a state in which the hot water temperature detected by the hot water temperature detection device is higher than a set temperature is detected for a certain period of time, even if the hot water temperature is detected by opening the on-off valve, the hot water temperature is lowered. Supplying hot water to the hot water supply terminal It can be.

  Even when the hot water mixing valve falls into an abnormal state such as a lock, it is possible to provide a hot water storage type hot water heater that does not supply hot hot water to the hot water supply terminal.

  A hot water storage hot water heater according to a first aspect of the present invention includes a hot water storage tank for storing hot water, a water inlet pipe connected to the lower part of the hot water storage tank, a water supply pipe branched from the middle of the water inlet pipe, and a hot water supply connected to the upper part of the hot water storage tank. A mixing valve to which the pipe, the water supply pipe and the hot water supply pipe are connected, a hot water pipe connected to the downstream of the hot water temperature mixing valve, a hot water temperature detecting device for detecting the temperature of hot water flowing through the hot water pipe, Detected by the hot water temperature detection device, a bypass pipe connecting the hot water supply pipe and the hot water pipe, and a connection position of the hot water pipe downstream from the hot water temperature detection device, an on-off valve provided in the middle of the bypass pipe, and When a state where the hot water temperature is higher than the set temperature is detected for a certain period of time, even if a high hot water temperature is detected by opening the on-off valve, hot water is supplied to the hot water supply terminal with a low hot water temperature. Can do.

  The hot water storage water heater of the second aspect of the invention can supply hot water to the hot water supply terminal with a simple configuration with a low hot water temperature by using an electromagnetic valve as the on-off valve, particularly in the first aspect of the invention. it can.

  The hot water storage water heater of the third aspect of the invention can change the amount of water according to the temperature detected by the hot water temperature detecting device by using a water amount control valve as the on-off valve, particularly in the first aspect of the invention. It is possible and does not waste water.

  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 view of a hot water storage type hot water heater according to a first embodiment of the present invention. As shown in FIG. 1, a water inlet pipe 2 is connected to the lower part of a hot water storage tank 1 for storing hot water, and water is supplied from the water supply source to the lower part of the hot water storage tank 1 through the water inlet pipe 2. A hot water supply pipe 3 is connected to the upper part of the hot water supply to supply hot water to the hot water supply terminal.

  Further, a water supply pipe 4 is provided which branches from the middle of the water intake pipe 2, and the water supply pipe 4 and the hot water supply pipe 3 are connected to the hot water mixing valve 5 and mixed to a desired temperature by the hot water temperature mixing valve 5. Is done. An outlet pipe 6 for supplying hot water to the hot water supply terminal is connected to the outlet side of the hot water mixing valve 5, and a thermistor 9 for detecting the temperature of the hot water mixed by the hot water mixing valve 5 is connected to the outlet hot water pipe 6. Is provided.

  Further, a bypass pipe 7 is provided that branches off from the middle of the water supply pipe 4 and is connected to the downstream side of a location where the thermistor 9 of the hot water discharge pipe 6 is provided. An electromagnetic valve 8 that is an on-off valve is provided in the middle of the bypass pipe 7.

  On the other hand, a heat source 10 is provided to boil hot water in the hot water storage tank 1, hot water in the lower part of the hot water storage tank 1 is sent to the heat source 10 to generate high temperature water, and a heat source is provided in the upper part of the hot water storage tank 1. The hot water generated in 10 is stored, and hot water is stored in the hot water storage tank 10 so as to form a temperature layer in which the upper part is hot and the lower part is low. The heat source 10 may have any boiling circuit configuration such as a heat pump circuit or a heater.

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

  First, when a user pours hot water from a hot water supply terminal (for example, curan), the hot water is supplied to the upper part of a hot water tank supplied from the hot water supply pipe 3 so that the set temperature is set by a remote controller (not shown). The high temperature hot water and low temperature water supplied from the water supply source through the water supply pipe 4 are mixed by the hot water mixing valve 5. Then, the hot water mixing valve 5 is driven so that the temperature detected by the thermistor 9 becomes the set temperature. If it is normal, it is determined that the hot water mixing valve 5 is normal at this time, so that the electromagnetic valve 8 remains closed and no water flows into the bypass pipe 7.

  FIG. 2 is a control flow diagram when the hot water mixing valve is abnormal. Based on FIG. 2, the drive of the hot water mixing valve in this Embodiment is demonstrated. Note that symbols such as S1 described after each operation correspond to the symbols described in FIG.

  First, a user pours hot water from a hot water supply terminal (S1). At this time, the electromagnetic valve 8 provided in the bypass pipe 7 is still closed. Next, it is determined whether or not the temperature of the hot water detected by the thermistor 9 is a set temperature (S2). If the temperature of the hot water detected by the thermistor 9 deviates from the set temperature, the thermistor 9 detects the temperature. The hot water mixing valve 5 is driven so that the temperature of the hot water becomes the set temperature (S3).

  Then, it is determined whether or not the temperature of the hot water detected by the thermistor 9 is lower than a determination temperature provided for abnormally high temperature determination (S4). If the temperature is lower than the determination temperature, it is determined that the operation is normal. (S5). However, when the temperature of the hot water detected by the thermistor 9 detects a temperature equal to or higher than the determination temperature and it is determined that the temperature equal to or higher than the determination temperature continues for a certain time (S6), the hot water temperature mixing valve 5 is It is determined that there is an abnormality (S7).

  If it is determined that the hot water temperature mixing valve 5 is above, the solenoid valve 8 is opened (S8), and the hot water supplied from the hot water temperature mixing valve 5 is mixed with the low temperature water supplied through the bypass pipe 7. In order to inform the user that the equipment has failed by lowering the temperature of the hot water supplied to the hot water supply terminal, further opening the solenoid valve 8 and displaying a warning of equipment abnormality (S9), It is possible to realize a highly safe hot water storage type water heater that does not supply hot water to the user.

  Even if the temperature of the thermistor 9 detects an abnormal temperature once, when the temperature detected by the thermistor 9 returns to the set temperature, the solenoid valve 8 can be closed again to perform normal operation. .

  In the present embodiment, the solenoid valve 8 is used as the on-off valve. However, the present invention is not limited to this, and the water temperature control valve is used instead of the solenoid valve 8 to adjust the temperature of the hot water detected by the thermistor 9. On the basis of this, the opening degree of the water amount control valve may be changed. In that case, the higher the temperature of the thermistor 9, the more the water amount control valve is opened. Can be used to save energy.

  As described above, the hot water storage water heater of the present invention can be applied in any form as long as it is a hot water storage water heater such as a heat pump or a heater as a heat source.

The block diagram of the hot water storage type water heater in Embodiment 1 of this invention Control flow chart at the time of abnormality of the hot water mixing valve in the same embodiment Configuration of a conventional hot water heater

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Water intake pipe 3 Hot water supply pipe 4 Water supply pipe
5 Hot water mixing valve 6 Hot water outlet pipe 7 Bypass pipe 8 Solenoid valve 9 Thermistor 10 Heat source

Claims (3)

A hot water storage tank for storing hot water, a water inlet pipe connected to the lower part of the hot water storage tank, a water supply pipe branched from the middle of the water inlet pipe, a hot water supply pipe connected to the upper part of the hot water storage tank, the water supply pipe and the hot water supply pipe A hot water temperature mixing valve connected to the hot water temperature, a tapping pipe connected downstream of the hot water temperature mixing valve, a hot water temperature detecting device for detecting the temperature of hot water flowing through the tapping water pipe, the water supply pipe and the tapping pipe A state where the hot water temperature detected by the hot water temperature detection device is higher than a set temperature, a bypass pipe in which the connection position with the hot water discharge pipe is downstream from the hot water temperature detection device, an on-off valve provided in the middle of the bypass pipe When the hot water is detected for a certain time, the on-off valve is opened. The hot water heater according to claim 1, wherein a solenoid valve is used as the on-off valve. The hot water storage water heater according to claim 1, wherein a water amount control valve is used as the on-off valve.

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