JPH0678755U - Hot water storage type water heater - Google Patents

Abstract

(57) [Abstract] [Purpose] In a hot water storage-type water heater, prevent the heating of the water supply by preventing the influence of the expansion water flowing into the water supply side to the destination and the heat transfer from the hot water in the tank. thing. [Composition] A branch pipe for supplying water to the hot water from the tank is provided by branching from the water supply pipe to the heating hot water storage tank to provide a pipe for expanding water and branching upstream from the pipe for expanding water. A water heater equipped with a flow path configuration that prevents the expansion water generated during heating in the tank from flowing into the branch pipe side, mixing the expansion water and from the expansion water in the flow path to the water supply side. Prevents temperature rise of feed water by eliminating heat transfer. As a means for preventing the inflow of the expansion water to the branch pipe side, it is possible to employ a device provided with a pressure reducing valve or a check valve in the water supply pipe between the branch pipe and the expansion water pipe.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hot water storage-type water heater having a structure in which heated hot water is stored in a tank having a built-in heater and the hot water is pushed up by a water supply pressure supplied from the outside to the tank to discharge hot water.

[0002]

[Prior art]

 As one of the methods of supplying hot water to a vanity and a hand-washing device, an electric water heater is provided in the cabinet, and water is supplied to the hot water storage tank inside it to push up the hot water that has been heated in the tank, and then the hot water is discharged. The electric water heater called "do" has been used conventionally.

FIG. 4 is a schematic diagram showing a piping system of a conventional electric water heater.

The electric water heater 1 includes a hot water storage tank 2 having a built-in heater 2 a, and a water supply port 3 connected to an external water supply pipe is projected to the outside, and a water supply pipe from the water supply port 3 to the bottom of the tank 2 is provided. It has a water supply system with 4. A hot water outlet pipe 5 is connected to the upper end of the tank 2, and the pipe end projects to the outside of the electric water heater 1 as a hot water outlet 5a.

On the other hand, in the illustrated example, a hot and cold water mixing tap 6 is provided as a hot water supply destination, and in order to supply water to this, the branch pipe 7 is bypassed from the middle of the water supply pipe 4 to the tank 2, and the pipe end is electrically connected. The water outlet 7a is projected to the outside of the water heater 1. Then, the water outlet 7a and the hot water outlet 5a are connected to the hot and cold water mixing tap 6 by connecting pipes 7b and 5b, so that the hot and cold water mixing tap 6 can be supplied with water and hot water.

Further, a decompression valve 8 is incorporated in the water supply pipe 4 upstream of the branch point of the branch pipe 7, and an expanded water pipe 9 is branched from the downstream thereof. The expansion water pipe 9 is provided with a relief valve 9a in the middle, and the pipe end is projected outward to be opened as an expansion water relief port 9b.

In the electric water heater 1 having such a piping system, the internal pressure of the set pressure of the pressure reducing valve 8 (for example, 0.6 kgf / cm ² ) always acts inside the tank 2 under normal conditions. At this time, when the heater 2a is energized to heat the water in the tank 2 to boil the hot water, expansion occurs when changing from water to hot water, and the internal pressure of the tank 2 rises. When the relief valve 9a opens at a set pressure (for example, 0.9 kgf / cm ² ), the relief valve 9a opens, and the expanded hot water flows from the water supply pipe 4 through the expansion water pipe 9. The expanded water is discharged from the escape port 9b.

When hot water is supplied using the hot and cold water mixing tap 6 when the heater 2a is heated, the internal pressure of the tank 2 is reduced to the set pressure of the pressure reducing valve 8 (0.6 kgf / cm ² ) and the expansion water is discharged. Is stopped.

[0009]

[Problems to be solved by the device]

 In the case of nighttime when the hot and cold water mixing tap 6 is used less frequently, the time interval between use becomes longer. On the other hand, the hot water stored in the tank 2 is kept warm by controlling the power supply to the heater 2a so that the temperature of the hot water does not decrease.

However, as described above, if the interval between the hot and cold water mixing taps 6 is long, the heat of the hot water in the tank 2 that is kept warm is transferred to the water supply pipe 4 and the branch pipe 7 for a long time. . Therefore, the temperature of the pipe from the water supply port 3 to the vicinity of the water outlet 7a rises due to heat transfer, and the water in the pipe is also heated by this.

In this way, when the temperature of the water to the water outlet 7a rises, even if the cold side is obtained by operating the water side when using the hot and cold water mixing tap 6, hot water is discharged. It will be.

In addition, when the operation of mixing water and hot water with the hot and cold water mixing valve 6 is performed, the heated water is gradually mixed with the water having the normal temperature during the initial period. Takes a gradual drop and goes to a steady temperature. Therefore, it is necessary for the user to operate so that a newly mixed water with an appropriate temperature can be obtained from the initial setting of the valve opening on the hot water side and the water side, which affects usability.

Further, in addition to the example shown in FIG. 4, for example, as described in Japanese Utility Model Laid-Open No. 64-1349, automatic water supply for connecting a water supply pipe and a hot water supply pipe to send mixed water to a supply destination. Some have built-in mixing valves.

However, even with such a configuration, since the water supply pipe up to the automatic water supply mixing valve is heated by the heat from the tank side, the same problem still occurs.

As described above, in the conventional hot water storage type water heater, if the supply destination is not operated for a long time, the water side is heated by using the pipe as the heat transfer medium.

The problem to be solved in the present invention is to prevent the expansion water from mixing into the water supply side to the supply destination and to prevent the heating of the water supply side due to the heat transfer in the flow path using the hot water in the tank as the heat source. It

[0017]

[Means for Solving the Problems]

 The present invention relates to a heating and hot water storage type tank connected to a water supply pipe, an expansion water pipe branched from the water supply pipe and discharging expansion water generated by an increase in internal pressure due to heating of water in the tank to the outside of the system, A branch pipe that branches from the water supply pipe and serves as a water supply path to the supply destination upstream of the expansion water pipe is provided, and the hot water from the tank and the water from the branch pipe are separately or combined and sent to the supply destination. The water heater is characterized in that it has a flow path configuration for preventing the expansion water from flowing into the branch pipe side.

The water supply pipe may be provided with a pressure reducing valve between the branch pipe and the expansion water pipe to maintain a high internal pressure on the side of the branch pipe.

A check valve may be provided between the branch pipe and the expanded water pipe to shut off the flow from the tank toward the branch pipe.

[0020]

[Action]

 Even if expansion water is generated by heating in the tank, the expansion water does not flow into the branch pipe provided as a water supply path to the supply destination, and thus the heating of the supply water is prevented. For this reason, even if water is discharged after the hot and cold water mixing tap has not been used for a long time at the supply destination, water at room temperature is discharged.

If a pressure reducing valve is provided in the water supply pipe between the branch pipe and the expanded water pipe, the internal pressure on the expanded water side is lower than that on the branched pipe side, so that the expanded water flows into the branched pipe side. Is blocked.

Further, if a check valve is provided in the water supply pipe between the branch pipe and the expansion water pipe, even if the expansion water is generated, this does not flow into the branch pipe side.

Therefore, even by providing the pressure reducing valve and the check valve, the temperature rise due to the mixing of the expansion water with respect to the water in the water supply passage and the heating due to the heat transfer in the flow passage are eliminated.

[0024]

【Example】

 FIG. 1 is a piping system diagram around an electric water heater showing an embodiment of the present invention. In this embodiment, a water supply system and a hot water supply system up to the hot and cold water mixing valve described as the prior art are designated, and the same members as those shown in FIG. 4 are designated by common reference numerals, and detailed description thereof will be omitted.

A pressure reducing valve 8 is incorporated in the water supply pipe 4 provided from the water supply port 3 to the bottom of the tank 2, and a branch pipe 7 is branched from the upstream side of the pressure reducing valve 8 to the water outlet 7a. Configure the flow path. A pressure reducing valve 10 is incorporated in the branch pipe 7.

The expansion water pipe 9 branches off from the water supply pipe 4a downstream of the pressure reducing valve 8 and has a relief valve 9a between it and the expansion water relief port 9b.

In this example as well, as in the case of the prior art shown in FIG. 4, the internal pressure of the set pressure (0.6 kgf / cm ² ) of the pressure reducing valve 8 is normally acting inside the tank 2. Then, when the water in the tank 2 is heated by the heater 2a to boil the water, the relief valve 9a opens when the internal pressure reaches the set pressure (0.9 kgf / cm ² ) for opening the relief valve 9a. Then, the expanded hot water is discharged from the water supply pipe 4 through the expanded water pipe 9 and the expanded water escape port 9b.

When boiling hot water in this way, expanded water is generated unless hot water is supplied from the hot and cold water mixing tap 6. Then, even when the hot and cold water mixing plug 6 is not used for a long time, and the hot water in the tank 2 is intermittently heated for heat retention, for example, expansion water is discharged due to increase in internal pressure.

With respect to the discharge of the expanded water, the pressure reducing valve 8 is located in the water supply pipe 4 extending from the tank 2 to the branch pipe 7. Therefore, the primary pressure on the side of the branch pipe 7 with the pressure reducing valve 8 interposed therebetween is Higher than the secondary pressure on the tank 2 side. Therefore, even if expanded water is generated, it does not flow back over the pressure reducing valve 8 to the side of the branch pipe 7, and the flow path to the water outlet 7a is maintained only in the water supply from the water supply port 3.

As described above, expansion water from the tank 2 is not mixed in the water supply system to the hot and cold water mixing tap 6, and heat is transferred through the piping, but the water supply temperature on the side of the water outlet 7a is maintained at the room temperature. it can. Therefore, even when only water is supplied from the hot and cold water mixing tap 6, unheated room temperature water can be obtained. For this reason, unlike the conventional case, there is no discharge of water whose temperature has risen due to expanded water, and there is no need to wastefully flow water until it cools down or to redo the operation when mixed with hot water.

FIG. 2 is a diagram showing an embodiment of another piping system.

In this example, the pressure reducing valve 8 and the check valve 11 are sequentially installed in the water supply pipe 4 from the water supply port 3 to the tank 2. Then, the branch pipe 7 extending from the pressure reducing valve 8 and the check valve 11 toward the water outlet 7a is connected, and the expansion water pipe 9 is connected downstream of the check valve 11.

When the expansion water is generated from the tank 2 and the internal pressure becomes higher than the set pressure of the escape valve 9a, the check valve 11 blocks the expansion water, and all the water flows to the expansion water pipe 9 side to release the expansion water. It is discharged from the mouth 9b. Therefore, the expanded water does not flow into the branch pipe 7, and the water from the water supply port 3 is maintained at room temperature without being heated to the water outlet 7a. Therefore, as in the previous example, when water supply is started at a supply destination such as a hot and cold water mixing tap, heated water is not discharged.

Further, FIG. 3 shows an example in which the tapping pipe 5 and the branch pipe 7 are connected to the automatic hot and cold water mixing valve 12 in the piping system of FIG. 2 and the mixed water is sent to the supply destination.

As described in Japanese Utility Model Laid-Open No. 64-1349, which was mentioned in the section of the prior art, the automatic hot and cold water mixing valve 12 automatically supplies mixed water of an appropriate temperature to the destination by the inflow of water and hot water. It is for sending and has a configuration in which the supply pipe 12a is connected.

Also in this example, even if the internal pressure of the tank 2 rises due to the heating of hot water and expansion water is generated, the check valve 11 does not flow into the branch pipe 7 side. Therefore, normal temperature water can be supplied to the automatic hot water mixing valve 12, and even when only water supply is performed, warm water is not discharged.

[0037]

[Effect of device]

 According to the present invention, even if expansion water is generated due to heating or heat retention of water in the tank, the water in the water supply path toward the supply destination is not heated. For this reason, if the facility is equipped with a hot and cold water mixing tap, for example, even if it is not used for a long time, it is possible to obtain water at room temperature when using only water, which does not affect usability.

Further, since water at room temperature is discharged at the spouting start time, in the case of a hot and cold water mixing tap, a mixed water with a required temperature can be obtained only by setting the mixing ratio with hot water as in the conventional case. Re-setting is not required, and usability is further improved.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of a piping system of a hot water storage type water heater of the present invention.

FIG. 2 is a diagram of another embodiment of the piping system, which is provided with a check valve for blocking the inflow of expansion water into the branch pipe.

FIG. 3 is a view of yet another embodiment of the piping system, in which a branch pipe and a hot water outlet pipe are connected to an automatic hot and cold water mixing valve.

FIG. 4 is a diagram showing a piping system of a conventional hot water storage type water heater.

[Explanation of symbols]

 1 Electric Water Heater 2 Tank 2a Heater 3 Water Supply Port 4 Water Supply Pipe 5 Hot Water Pipe 6 Hot Water Mixing Plug 7 Branch Pipe 8 Pressure Reducing Valve 9 Expansion Water Pipe 9a Relief Valve 9b Expansion Water Relief Port 10 Pressure Reduction Valve 11 Check Valve 12 Automatic Hot Water Mixing valve

Claims (3)

[Scope of utility model registration request] 1. A heating and hot water storage type tank connected to a water supply pipe, and an expansion water pipe branched from the water supply pipe for discharging expansion water generated by an increase in internal pressure due to heating of water in the tank to the outside of the system. A branch pipe branched from the water supply pipe upstream of the expanded water pipe to serve as a water supply path to the supply destination, and the hot water from the tank and the water from the branch pipe are separately or joined to the supply destination. A hot-water storage water heater for sending water, comprising a flow path structure for preventing the expansion water from flowing into the branch pipe side. 2. The hot water storage water heater according to claim 1, wherein the water supply pipe is provided with a pressure reducing valve between the branch pipe and the expanded water pipe. 3. A check valve according to claim 1, wherein the water supply pipe is provided with a check valve between the branch pipe and the expansion water pipe for shutting off a flow from the tank toward the side of the branch pipe. Hot water storage type water heater.