JP2007247955A - Hot water storage type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water storage type water heater capable of simultaneously draining water from a plurality of hot water storage tanks and shortening the draining time, leading to improvement in serviceability. <P>SOLUTION: The hot water storage type water heater is equipped with: the plurality of hot water storage tanks 4 and 6 connected in series; a connecting pipe 5 for connecting an upper part of the water-intake side hot water storage tank 4 and the bottom part of the hot water storage tank 6; a plurality of water discharge pipes 12 and 13 connected so that one ends are communicated with the bottom parts of the plurality of hot water storage tanks 4 and 6; and one water discharge valve 11 for connecting the other ends of the plurality of discharge pipes 12 and 13 to each other to make them merge, provided at the merging part or on the further downstream side of the merging part. An air intake valve 14 is provided at an end of the connecting pipe 5 on the side connected with the upper part of the water-intake side hot water storage tank 4, and simultaneous water draining of the plurality of hot water storage tanks 4 and 6 is made possible. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hot water storage type water heater in which a plurality of hot water storage tanks are connected in series.

  Conventionally, a hot water storage type water heater in which a plurality of hot water storage tanks are connected in series is known. Until now, in such a hot water storage type water heater, drainage from the hot water storage tank 1b on the intake side and the hot water storage tank 1a on the hot water supply side is drained to the outside by opening one drain valve 29 (for example, , See Patent Document 1).

Japanese Patent Laying-Open No. 2005-164153 (FIG. 1)

  However, in reality, in the configuration using this one drain valve 29, the air of the relief valve is mixed only in the hot water storage tank 1a on the hot water supply side, and the drainage of the hot water storage tank 1b on the intake side is not started simultaneously. After the water level of the hot water storage tank 1a is lowered to the junction between the hot water storage tank 1a and the hot water tank connecting pipe, air is mixed in via the connecting pipe 2. In other words, since it is a series two tank system, it takes a time equivalent to the drainage time for two tanks.

  An object of the present invention is to solve the above-described problems, and an object of the present invention is to provide a hot water storage type water heater capable of shortening a drainage time.

A hot water storage type water heater of the present invention includes a plurality of hot water storage tanks connected in series, a connecting pipe that connects an upper portion of a water intake side hot water storage tank and a bottom portion of the hot water supply side hot water storage tank, and one end of the plurality of hot water storage tanks. A hot water storage type comprising: a plurality of drain pipes connected so as to communicate with each other; and a plurality of drain pipes connected to each other and joined together, and one drain valve provided downstream of the junction or junction In the water heater, an air intake valve is arranged at the end of the connecting pipe on the side connected to the upper part of the intake side hot water storage tank.

  According to the hot water storage type water heater of the present invention, since the air intake valve is arranged at the end of the connecting pipe on the side connected to the upper part of the intake side hot water storage tank, air is discharged from the air intake valve during drainage. By taking in, it is possible to cause simultaneous drainage from both the intake side hot water storage tank and the hot water supply side hot water storage tank, and there is an effect that the drainage time can be shortened. This also has the effect of improving serviceability.

Embodiment 1 FIG.
FIG. 1 is a main part configuration diagram of a hot water storage type hot water heater showing Embodiment 1 of the present invention, and the details of this configuration will be described below based on the drawings.

In FIG. 1, the water heater body 1 includes two hot water storage tanks 4 and 6 connected in series. A water supply pipe 2 for supplying water is connected to the bottom of the intake side hot water storage tank 4. A stop cock 2a that is manually opened and closed and a pressure reducing valve 3 that reduces the water supply pressure to a predetermined pressure are interposed in the path of the water supply pipe 2.
The upper part of the water intake side hot water storage tank 4 and the bottom part of the hot water supply side hot water storage tank 6 are connected by a connecting pipe 5, and the hot water supply pipe 8 for taking out hot water is connected to the upper part of the hot water supply side hot water storage tank 5. An outflow pipe 16 for supplying low temperature water to a heat pump unit 15 as a heating source is connected to the bottom of the water intake side hot water storage tank 4, and high temperature water heated by the heat pump unit 15 is connected to the upper part of the hot water supply side hot water storage tank 6. Is connected to an inflow pipe 17 through which the water flows into the hot water storage tank 6. At this time, although not shown, a circulation pump is interposed in the path of the outflow pipe 16.

  In the path of the hot water supply pipe 8, a relief valve 7 for discharging the expanded water at the time of boiling, a bath side mixing valve for mixing the hot water from the hot water supply pipe 8 and the water from the branch water supply pipe 2c branched from the water supply pipe 2 9 and the hot water supply side mixing valve 10 are connected, and the hot water taken out from these mixing valves 9 and 10 can be supplied to a bathtub (not shown), or supplied to a kitchen or a washroom.

  The water supply pipe 2 is provided with a branch portion 2a branched from a path connected to the bottom of the intake side hot water storage tank 4, and a first drain pipe 12 for draining water in the intake side hot water storage tank to the branch portion 2a. One end is connected. One end of the second drain pipe 13 is connected to the bottom of the hot water supply side hot water storage tank 6. The other ends of the first drain pipe 12 and the second drain pipe 13 are connected and joined together, and the drain valve 11 is connected to the junction. Furthermore, it opens at the time of draining the water in the water intake side hot water storage tank 4 located in the edge part of the connection pipe 5 of the side connected with the upper part of the said water intake side hot water storage tank 4 in the said water intake side hot water storage tank 4. An air intake valve 14 for taking in air is arranged.

Next, the operation of the hot water storage type water heater in the first embodiment will be described.
First, at the time of water supply, the stop cock 2a is opened, and the water supplied from the water supply pipe 2 is reduced to a predetermined pressure by the pressure reducing valve 3 and supplied from the lower part of the intake side hot water storage tank 4, and the connecting pipe 5, Water is supplied in the order of the side hot water storage tank 6, and the two hot water storage tanks 4 and 6 connected in series are respectively filled with water. At this time, the air intake valve 14 is closed and shut off from the outside world, and the relief valve 7 is opened. When the two hot water storage tanks 4 and 6 are full of water, the water begins to be discharged to the outside through the relief valve 7, and then the relief valve 7 is closed.

At the time of boiling, the hot water storage water is set by a remote controller (not shown) in the heat pump unit 15 connected to the two hot water storage tanks 4 and 6 to form a circulation circuit with the inflow pipe 16 and the outflow pipe 17. Boil to a temperature (eg 90 ° C.).
The expanded water in the two hot water storage tanks 4 and 6 at the time of boiling is discharged from the relief valve 7.

Next, the operation during use will be described.
When an instruction to start hot water supply or bath filling is received from a remote controller (not shown), a control unit (not shown) calculates the starting opening of the mixing valve based on a predetermined set temperature, and the bath-side mixing valve 9 or The opening degree of the hot water supply mixing valve 10 is activated. At this time, since the air intake valve 14 and the relief valve 7 are closed, they are shut off from the outside.

  FIG. 2 is a main part configuration diagram of the hot water storage water heater according to the first embodiment of the present invention during drainage, and the operation during drainage in this configuration will be described in detail below with reference to the drawings.

In the hot water storage type hot water heater of the first embodiment, the intake side hot water storage tank 4 and the hot water supply side hot water storage tank 6 are shifted from a full water state to a drained state. Therefore, in the configuration of the first embodiment, first, before the transition to the drained state, the relief valve 7 and the air intake valve 14 are opened so that air can be mixed therein. Thereafter, the drain valve 11 is opened and the drain operation is started.

When the drainage operation is started, air is sucked into the water intake side hot water storage tank 4 from the air intake valve 14 through the end of the connecting pipe 5, and from the relief valve 7 into the hot water supply side hot water storage tank 6. Air is sucked through the hot water supply pipe 8. Thereby, in the hot water storage type hot water heater having the configuration of the first embodiment, the water in the intake side hot water storage tank 4 passes through a part of the water supply pipe 2 and passes through the drain valve 11 from the first drain pipe 12. The water in the hot water supply hot water storage tank 6 is drained from the second drain pipe 13 through the drain valve 11. Accordingly, since the drainage can be started simultaneously from the two hot water storage tanks 4 and 6, the drainage of the hot water storage side hot water storage tank 4 is performed after the drainage of the hot water storage side hot water storage tank 6 is completed as in the prior art. Compared to what has been done, drainage time can be greatly reduced. Therefore, it leads to improvement of serviceability.

In the first embodiment, the drain valve 11 is described as being connected to the junction where the first drain pipe 12 and the second drain pipe 13 are joined. However, the present invention is specified in this configuration. For example, the drainage valve 11 may be provided on the downstream side of the merging portion, and it is needless to say that the drainage valve 11 can be appropriately changed without departing from the gist.

It is a principal part block diagram of the hot water storage type water heater which shows Embodiment 1 of this invention. It is a principal part block diagram at the time of the drainage of the hot water storage type water heater which shows Embodiment 1 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water heater main body, 2 Water supply pipe, 3 Pressure reducing valve, 4 Water intake side hot water storage tank, 5 Connection pipe, 6 Hot water supply side hot water storage tank, 7 Relief valve, 8 Hot water supply pipe, 9 Bath side mixing valve, 10 Hot water supply side mixing valve, 11 Drain valve, 12 First drain pipe, 13 Second drain pipe, 14 Air intake valve, 15 Heat pump unit, 16 Inflow pipe, 17 Outflow pipe

Claims (2)

A plurality of hot water storage tanks connected in series, a connecting pipe that connects the upper part of the intake water storage hot water tank and the bottom of the hot water supply hot water storage tank, and a plurality of terminals connected at one end to communicate with the bottoms of the hot water storage tanks In the hot water storage type hot water heater, comprising: a drain pipe and a plurality of drain pipes connected to each other and merged, and one drain valve provided downstream of the junction or merge section, the intake side hot water storage tank A hot water storage type water heater, wherein an air intake valve is arranged at an end of the connecting pipe on the side connected to the upper part of the water pipe. The drain pipe connected to communicate with the bottom of the intake water storage tank is connected to communicate with the bottom of the intake water storage tank via a part of the water supply pipe. The hot-water storage water heater described.

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