JP4375264B2 - Hot water heater - Google Patents

Description

  The present invention relates to a hot water storage water heater that stores water by heating water.

  Conventionally, this type of hot water heater has been used to discharge hot water by mixing hot water stored in an upper portion of a hot water storage tank and water decompressed by a pressure reducing valve (for example, see Patent Document 1).

FIG. 3 shows a conventional hot water storage water heater described in Patent Document 1. As shown in FIG. As shown in FIG. 3, a hot water supply circuit 22 for supplying tap water and a hot water supply circuit 23 for supplying hot water in the hot water storage tank 21 are connected to the hot water storage tank 21. The tap water supplied into the hot water storage tank 21 by the water supply circuit 22 is decompressed by the first pressure reducing valve 24 or the second pressure reducing valve 25. The hot water discharged from the hot water storage hot water heater to the terminal is a mixture of hot hot water stored in the upper part of the hot water storage tank 21 by the hot water supply circuit 23 and tap water decompressed by the first pressure reducing valve 24.
JP-A-2-2177752

  However, in the conventional configuration, the hot water discharged from the terminal is a mixture of hot hot water stored in the upper part of the hot water storage tank 21 by the hot water supply circuit 23 and tap water decompressed by the first pressure reducing valve 24. Since the hot water is discharged in a depressurized state, there is a problem that the feeling of use is poor because the pressure is low and the amount of hot water is small.

  In particular, when used in a shower or the like, if the tapping pressure is low and the tapping amount is small, the feeling of use is felt very badly. Therefore, the user manually adjusts the faucet (terminal) side, for example, the set temperature. The temperature at which the hot water is discharged to the terminal from the hot water storage heater is set to 60 ° C., for example, tap water before decompression is manually adjusted, and the hot water is discharged as the user feels to increase the hot water pressure. In some cases, the amount of hot water was increased to improve the feeling of use. In this case, since adjustment is performed manually by the user's sense, it takes time and the setting changes every time, and the temperature discharged from the terminal may be high or low. There was also a concern that it would be difficult to get a feeling of bathing.

  An object of the present invention is to solve the above-described conventional problems, and an object of the present invention is to provide a hot water storage water heater that discharges hot water by increasing the pressure of hot water from a terminal by setting operation of the hot water storage water heater.

  In order to solve the above-described conventional problems, the mixed water supply pipe of the present invention is connected to the hot water mixing valve without going through the pressure reducing valve from the middle of the water supply pipe supplying water to the pressure reducing valve, and is thereby stored in the hot water storage tank. It is possible to improve the depressurization of hot water having a predetermined temperature obtained by mixing tap water before depressurizing with hot water and using a hot water mixing valve.

The hot water storage water heater of the present invention is provided with a mixed water supply pipe connected to a hot water mixing valve without going through the pressure reducing valve from the middle of the water supply pipe supplying water to the pressure reducing valve, and hot water stored in a hot water storage tank by the hot water mixing valve. By mixing the tap water before depressurization with hot water, the hot water obtained with the hot water mixing valve is applied with the tap pressure before depressurization, increasing the tapping pressure from the terminal and increasing the amount of tapping. Ri Na as can be improved, by providing the bypass pipe, tap water with an equal volume, yet the pressure before decompression also be a closer, more easily stabilized at a predetermined temperature hot water is obtained by mixing faucet valve Become.

The hot water storage type water heater of the present invention includes a hot water storage tank for storing hot water heated by a heating means, a water supply pipe for supplying tap water to the hot water storage tank, and an arbitrary pressure of tap water in the middle of the water supply pipe. A pressure reducing valve that can be set, a hot water mixing valve that obtains hot water at a predetermined temperature by mixing water supplied via the water supply pipe and hot water in the hot water storage tank, and a pressure reducing valve from the middle of the water supply pipe. The hot water from the hot water storage tank is supplied to the hot water mixing valve.
A bypass pipe connecting the middle of the hot water path and the middle of the mixed water supply pipe, and mixing the tap water from the bypass pipe before supplying the hot water from the hot water storage tank to the hot water mixing valve, in the mixing valve is arranged to mix the hot water from the hot water storage tank mixed with tap water from the bypass pipe to the previous tap water under reduced pressure.

  And since the mixing water supply pipe connected to the hot water mixing valve is arranged from the middle of the water supply pipe supplying water to the pressure reducing valve without going through the pressure reducing valve, the hot water stored in the hot water storage tank is decompressed with the hot water mixing valve. By mixing the tap water, the hot water obtained with the hot water mixing valve can be applied with the tap water pressure before depressurization, increasing the hot water pressure from the terminal and increasing the amount of hot water to improve the feeling of use. become able to.

And if the hot water and tap water mixing valve has a pressure difference and a flow rate difference that are too large, it becomes difficult to obtain hot water at a predetermined temperature. For example, the temperature of hot water from a hot water tank supplied to the hot water mixing valve is 90 ° C., the pressure is 1.5 kg / cm ² , and the temperature of tap water before being reduced without passing through the pressure reducing valve supplied to the hot water mixing valve is 20 ° C. If the pressure is 4-5 kg / cm ² and the temperature at which the hot water is discharged from the hot water mixing valve is 40 ° C., the temperature difference of the hot water from the hot water storage tank is 50 ° C. and the temperature difference of the tap water is 20 ° C. The hot water from the hot water storage tank supplied to the water is one-half the amount of tap water before depressurization, and the pressure is also one-third, so the difference is large, and it is inevitably stable with the hot water mixing valve. There is a problem that hot water of temperature cannot be obtained. However, since the tap water before depressurization is connected in the middle of the hot water path for supplying the hot water from the hot water storage tank to the hot water mixing valve by the bypass pipe, it becomes easy to obtain hot water having a stable predetermined temperature by the hot water mixing valve. For example, if the tap water before depressurization is mixed with hot water from a hot water tank supplied to the hot water mixing valve in an amount of about 1/2 to 1 time, the temperature of the hot water supplied to the hot water mixing valve is about 60. ° C., pressures of about 2.8 kg / cm ^2, and the hot water supplied to the hot and cold water mixing valve, will be close tap water with an equal volume, yet the pressure before the decompression, stable predetermined temperature hot water in the hot and cold water mixing valve Becomes easier to obtain.

According to a second aspect of the invention , in particular, in the first aspect of the invention, a cold water shut-off electromagnetic valve is disposed in one or both of the mixed water supply pipe and the bypass piping path.

  And since the hot water and tap water supplied to the hot water mixing valve are greatly different in pressure, there is a concern that the tap water before depressurizing with high pressure will flow into the hot water with low pressure, that is, the hot water storage tank side. Alternatively, a chilled water shut-off solenoid valve is installed in either or both of the bypass piping paths, so when the hot water mixing valve is not discharged, the chilled water shut-off solenoid valve is closed so that the high pressure tap water flow Can be stopped, and there is no worry of flowing into the hot water storage tank.

According to a third aspect of the invention , in particular, in the first or second aspect of the invention, a hot water shut-off solenoid valve is disposed in the middle of a pipe connecting hot water stored in a hot water storage tank to a hot water mixing valve.

  And since the hot water closing solenoid valve is arranged in the middle of the piping connecting the hot water stored in the hot water storage tank to the hot water mixing valve, the hot water closing solenoid valve is closed when the hot water is not discharged from the hot water mixing valve. Can be prevented from flowing into the low-temperature hot water side, and there is no fear of flowing into the hot water storage tank side.

Furthermore, if for some reason a small flow rate flows and the cold water shut-off solenoid valve is closed, the hot water stored in the hot water storage tank gradually flows and accumulates in the middle of the terminal piping.
There is a risk of hot water flowing in the middle of the accumulated piping when it is used next, resulting in the risk of burns, etc., but a hot water shut-off solenoid valve is installed, and the cold water shut-off solenoid valve and hot water close solenoid valve The worries are also resolved by operating the and simultaneously.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 is a diagram showing a schematic configuration of a hot water storage hot water heater according to a first embodiment of the present invention, and FIG. 2 is a control block diagram.

    In FIG. 1, 1 is a water supply pipe, 2 is a hot water storage tank connected to the bottom of the water supply pipe 1, and the tap water supplied into the hot water storage tank 2 is a structural regulation of the hot water heater such as the pressure resistance of the hot water storage tank 2. Therefore, the pressure is reduced by the pressure reducing valve 3 and water is supplied to the hot water storage tank 2.

    The water in the hot water storage tank 2 is pumped from the lower part of the hot water storage tank 2 by the tank pump 4, and the water in the heating passage 6 and a part of the piping circuit of the heat pump unit 5 using CO2 refrigerant or the like Heated by a water heat exchanger 8 composed of a combination with a tank heat transfer passage 7 that passes therethrough, is circulated to the upper part of the hot water storage tank 2.

  A hot water supply pipe 9 is connected to the upper part of the hot water storage tank 2 and is connected to a predetermined place, for example, a hot water outlet 10 of a kitchen or a bath, etc. via a hot water mixing valve 11. Hot water from the hot water supply pipe 9 and tap water supplied through the mixing pipe 12 without going through the pressure reducing valve 3 from the middle of the water supply pipe 1 for supplying water to the pressure reducing valve 3 are mixed into the hot water supply port 10 as hot water having a predetermined temperature. It comes to be discharged from hot water.

  In addition, tap water before depressurization from the middle of the mixing pipe 12 without going through the pressure reducing valve 3 is connected by a bypass pipe 13 in the middle of the hot water path of the hot water piping 9 for supplying hot water from the hot water storage tank 2 to the hot water mixing valve 11. A cold water shut-off solenoid valve 14 is provided in a portion of the mixing pipe 12 located upstream from the upstream connecting portion of the bypass pipe 13, and hot water from the hot water storage tank 2 is supplied to the hot water mixing valve 11 when not in use. The pressure of tap water before depressurizing is not applied in the middle of the hot water path to be supplied to Further, a hot water closing solenoid valve 15 is provided in a portion of the hot water supply pipe 9 located upstream from the connection part on the downstream side of the bypass pipe 13. When the hot water is discharged from the hot water supply pipe 9, water is supplied from the water supply pipe 11 into the hot water storage tank 2.

    A control unit 16 controls the tank pump 4, the cold water closing electromagnetic valve 14, the hot water closing electromagnetic valve 15, the heat pump unit 5, and the like in a predetermined sequence under the conditions input by the operation unit.

  In the above-described configuration, normally, a large amount of water is heated by the heat pump unit 5 using inexpensive late-night power from 11:00 pm to 5:00 am, and the hot water is stored in the hot water storage tank 2, and hot water is supplied to the kitchen or bath. At this time, water is pumped up from the lower part of the hot water storage tank 2 by the tank pump 4 and the water in the heating passage 6 and a part of the piping circuit of the heat pump unit 5 and the water in the hot water storage tank 2 are used. Heating is performed by heating with a water heat exchanger 8 composed of a combination with a tank heat transfer passage 7 through which the hot water passes, and in the hot water storage tank 2, the hot water is accumulated in an upper part and the water is separated into a lower part due to a difference in specific gravity. To raise.

The hot water stored in the hot water storage tank 2 is used for hot water supply as high temperature water from a predetermined place connected to the hot water supply pipe 9 connected to the upper part of the hot water storage tank 2, for example, a hot water outlet 10 of a kitchen or bath. Water is supplied from the water supply pipe 1 into the hot water storage tank 2 by the amount used.

  Then, a mixing pipe 12 connected to the hot water mixing valve 11 without going through the pressure reducing valve 3 is disposed from the middle of the water supply pipe 1 for supplying water to the pressure reducing valve 3, and hot water from the hot water storage tank 2 is supplied to the hot water mixing valve 11. In the middle of the hot water path, there is a bypass pipe 13 for connecting tap water before depressurization without going through the pressure reducing valve 3 from the middle of the water supply pipe 1 for supplying water to the pressure reducing valve 3. By mixing the hot water stored in 2 and the tap water before depressurizing, the hot water obtained by the hot water mixing valve 11 is applied with the tap pressure before depressurizing, and the hot water pressure from the terminal is increased. The amount of hot water is increased, and hot water having a stable predetermined temperature is obtained, so that the feeling of use can be improved.

Here, the hot water / water mixing valve 11 inevitably makes it difficult to obtain hot water having a predetermined temperature if the pressure difference and flow rate difference between hot water and tap water to be mixed are too large. For example, the temperature of hot water from the hot water storage tank 2 supplied to the hot water mixing valve 11 is 90 ° C., the pressure is 1.5 kg / cm ² , and the water supply pipe before pressure reduction without passing through the pressure reducing valve 3 supplied to the hot water mixing valve 11 When the temperature of tap water supplied from 1 is 20 ° C., the pressure is 4-5 kg / cm ² , and the temperature of hot water discharged from the hot water mixing valve 11 is 40 ° C., the temperature difference of hot water from the hot water storage tank 2 is 50 ° C., Since the temperature difference of the tap water is 20 ° C., the hot water from the hot water storage tank 2 supplied to the hot water mixing valve 11 becomes 1/2 of the amount of tap water before depressurization, and the pressure is also 3 minutes. 1, the difference is large, and there is a problem that hot water having a predetermined temperature cannot be obtained with the hot and cold mixing valve 11 inevitably. However, since the tap water before being depressurized is connected to the hot water path through which the hot water from the hot water storage tank 2 is supplied to the hot water mixing valve 11 by the bypass pipe 13, hot water having a stable predetermined temperature is obtained by the hot water mixing valve 11. It becomes easy to be done. For example, if tap water before depressurization is mixed with hot water from the hot water tank 2 supplied to the hot water mixing valve 11 in an amount of about 1/2 to 1 time, the temperature of the hot water supplied to the hot water mixing valve 11 Is about 60 ° C. and the pressure is about 2.8 kg / cm ² , and the hot water supplied to the hot and cold mixing valve 11 is equivalent to tap water before depressurization, and the pressure is also close, and the hot and cold mixing valve 11 is stable. It becomes easy to obtain warm water having a predetermined temperature.

  Moreover, since the pressure of hot water and tap water supplied to the hot water mixing valve 11 is greatly different, there is a concern that the tap water before depressurization with high pressure flows into the hot water with low pressure, that is, the hot water storage tank 2 side. Since the cold water closing electromagnetic valve 14 is provided in the pipe 12, when the hot water mixing valve 11 is not discharged, the cold water closing electromagnetic valve 14 is closed so that the flow on the high-pressure tap water side can be stopped. Thus, there is no fear of flowing into the hot water storage tank 2 side.

  Further, since the hot water closing electromagnetic valve 15 is arranged in the middle of the pipe connecting the hot water stored in the hot water storage tank 2 to the hot water mixing valve 11, the hot water closing electromagnetic valve 15 is closed when the hot water mixing valve 11 is not discharged. By doing so, it becomes possible to prevent the low pressure from flowing into the hot water side, and there is no fear of flowing into the hot water storage tank 2 side.

  And, for some reason, if a minute flow rate flows and the cold water shut-off solenoid valve 14 is left closed, the hot water stored in the hot water storage tank 2 gradually flows and accumulates in the middle of the terminal piping, When it is used next, hot water in the middle of the accumulated pipe flows and there is a risk of causing burns or the like. However, a hot water closing solenoid valve 15 is provided, and the cold water closing solenoid valve 14 and hot water are disposed. Such anxiety is also eliminated by operating the closing solenoid valve 15 simultaneously.

In addition, although the configuration in which the mixed water supply pipe is disposed and the configuration in which the bypass piping is disposed are described at the same time, this may be configured individually, as long as the configuration of each other part is within the scope of achieving the object of the present invention,
The configuration may be anything.

  As described above, the hot water storage type hot water heater according to the present invention can increase the hot water pressure from the terminal and increase the amount of hot water to improve the feeling of use. It can be applied to other uses.

The figure which shows schematic structure of the hot water storage type water heater in Example 1 of this invention. Control block diagram of the hot water heater The figure which shows schematic structure of the hot water storage type water heater in the conventional Example.

DESCRIPTION OF SYMBOLS 1 Water supply piping 2 Hot water storage tank 3 Pressure reducing valve 11 Hot water mixing valve 12 Mixing piping 13 Bypass piping 14 Cold water shut-off solenoid valve 15 Hot water shut-off solenoid valve

Claims (3)

A hot water storage tank for storing hot water heated by the heating means, a water supply pipe for supplying tap water to the hot water storage tank, a pressure reducing valve capable of arbitrarily setting the pressure of tap water in the water supply pipe, and the water supply A hot water mixing valve that mixes water supplied via a pipe with hot water in the hot water storage tank to obtain hot water at a predetermined temperature, and is connected to the hot water mixing valve from the middle of the water supply pipe without going through a pressure reducing valve. A hot water from the hot water storage tank to the hot water mixing valve, comprising: a mixed water supply pipe; and a bypass pipe connecting the middle of the hot water path for supplying hot water from the hot water storage tank to the hot water mixing valve and the middle of the mixed water supply pipe mixing tap water from the bypass pipe before supplying so that said at hot and cold water mixing valve for mixing the hot water from the hot water storage tank mixed with tap water from the bypass pipe to the previous tap water depressurizing Hot water storage made up of Water heater. The hot water storage type hot water heater according to claim 1, wherein a cold water closing electromagnetic valve is disposed in one or both of the mixed water supply pipe or the bypass pipe path. The hot water storage type water heater according to any one of claims 1 and 2 , wherein a hot water closing electromagnetic valve is arranged in the middle of a pipe connecting the hot water stored in the hot water storage tank to the hot water mixing valve.

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