JPS5815812Y2 - hot water storage type water heater - Google Patents

Description

[Detailed description of the invention] This invention relates to a hot water storage type water heater that uses electricity as a heat source, for example, and is intended to drain water when drawing hot water, prevent freezing, and prevent damage to the hot water storage tank.

Conventional water heaters of this type generate convection by heating the water in the hot water storage tank with a heating element, repeating natural circulation and averaging the temperature of the water in the tank to a predetermined temperature, and then installing the water in the middle of the water supply pipe. Hot water is drawn by opening and closing the faucet, but the disadvantage is that the longer the hot water pipe is, the worse the water is drained from the hot water pipe and the hot water is wasted after the required amount of hot water is drawn and the faucet is closed. Ta.

Especially if the hot water sampling point is below the hot water storage tank,
In addition to the above-mentioned drawbacks, the water head difference in the hot water supply section creates a vacuum inside the hot water supply pipe, creating negative pressure in the hot water storage tank, which can cause damage to the tank and shorten its lifespan.

Furthermore, the remaining hot water in the hot water pipes after the required amount has been drawn is drained by the repeated flow of air in and out from the tip of the hot water pipe, which not only takes a long time to completely drain, but also causes problems such as surface tension and pipe resistance inside the hot water pipes. If water remains or the end of the hot water pipe is blocked, freezing or abnormal pressure may occur, making it impossible to extract hot water or damaging the hot water tank.

This invention eliminates these drawbacks and will be explained in detail below with reference to the illustrated embodiments.

In Figure 1, 1 indicates a hot water supply port 2 at the top and a water supply port 3 at the bottom.
A hot water storage tank 4 is a water supply pipe that communicates with a water supply port 3 at one end and a water source at the other end, and a water supply tap 5 is provided in the middle.

6.6 is a pair of circulation pipes connected to the upper and lower sides of the hot water storage tank 1, and 7 is a heating tank whose upper and lower parts are connected to the circulation pipes, and which has a heating element 8 built therein.

Reference numeral 9 denotes a hot water supply pipe having one end connected to the hot water supply port 2 of the hot water storage tank 1 and the other end communicating with the atmosphere below the hot water storage tank 1;
0 is an L-shaped communication pipe having a diameter and length smaller than this hot water supply pipe, and at a position above the hot water supply pipe 9, the end communicates with the atmospheric communication port side of the hot water supply pipe 9 vertically downward. However, the other end is fixed so as to communicate with the atmosphere outside the hot water supply pipe 9.

Reference numeral 11 denotes a water control plate provided directly above the water supply port 3 in the hot water storage tank 1.

Another embodiment shown in FIG.
3, and a communication pipe 10 is provided at an intermediate position of the hot water supply pipe 9.

Reference numeral 14 denotes a pulp for hot water sampling provided within the hot water mixing faucet 12, and numeral 15 represents a water sampling valve provided within the hot water mixing faucet 12.

In the above configuration, when supplying water to the hot water storage tank 1, when the hot water sampling valve 14 in the water tap 5 or the hot water mixer tap 12 is opened, water flows between the hot water storage tank 1 and the heating tank 7 by the water source pressure. After the water is filled with water, it flows out from the hot water pipe 9.

After confirming this outflow water, when the water tap 5 or the hot water sampling valve 14 in the hot water mixing tap 12 is closed, one end of the hot water pipe 9 is communicated with the atmosphere and heated via the circulation pipes 6, 6. A water circulation path is formed between the tank I and the hot water storage tank 1.

When the heating element 8 built into the heating tank 1 is energized in this state, a small amount of water in the heating tank 7, which has a considerably smaller capacity than the hot water storage tank 1, is rapidly heated and expands into high-temperature water, which circulates upward. The hot water is sent from the pipe 6 to the upper part of the hot water storage tank 1,
The cold water in the lower part of the hot water storage tank 1 is sent to the heating tank 7 through the lower circulation pipe 6, and the cold water in the hot water storage tank 1 and the high temperature water in the heating tank 7 create a natural circulation, and the heating element 8 is continuously energized. The expanded water is discharged into the atmosphere through the hot water supply pipe 9, but because the inside of the hot water supply pipe 9 is always at atmospheric pressure due to the communication pipe 10 installed in the middle of the hot water supply pipe 9, the water discharge speed is fast, and the hot water is discharged into the fort. It is possible to prevent the expanded discharged hot water from freezing midway inside the hot water supply pipe 9 during the severe cold of winter, and even if the tip of the hot water supply pipe 9 is blocked due to freezing or defective piping, the communication pipe 10 will prevent it from reaching the atmosphere. Because hot water can be communicated or drained, there is no pressure increase in the hot water storage tank 1.

The high temperature water stored in the upper part of the hot water storage tank 1 is stored in the hot water storage tank 1.
Since the specific gravity is smaller than the cold water in the hot water storage tank 1, it is difficult to mix the circulation up and down in the hot water storage tank 1, and when the heating element 8 is kept energized, the high temperature water in the upper part of the hot water storage tank 1 gradually increases and reaches the bottom. At the end, all of the cold water in the hot water storage tank 1 reaches the predetermined final hot water temperature.

When all the water in the hot water storage tank 1 reaches the final high temperature water and the required amount of hot water is obtained, open the hot water tap 5 or hot water mixing valve 14 of the hot water mixer tap 12, and the water will flow into the hot water storage tank 1. Eri cold water is supplied from the water supply port 3 to the water source water pressure, and is quietly diffused around the inside of the hot water storage tank 1 by a water control plate 11 provided at the water supply port 3, and high temperature water of the same amount as the supplied cold water is provided at the top of the hot water storage tank 1. Hot water can be drawn from the open end of the hot water pipe 9 or from the faucet 13; When the hot water sampling valve 14 in the hot water supply pipe 12 is closed, the inside of the hot water supply pipe 9 rarely becomes a vacuum, so that negative pressure does not occur in the hot water storage tank 1 and the remaining hot water in the hot water supply pipe 9 is quickly removed. Make sure the hot water drains well and prevents the hot water tank from breaking or freezing.

In particular, in the embodiment shown in FIG. 1, since the communication pipe 10 is provided at the top of the hot water supply pipe 9, negative pressure is least likely to occur in the hot water storage tank 1, and the remaining hot water in the hot water supply pipe 9 is drained most quickly. Not only is this possible, but the hot water draining speed during expansion and draining is the fastest, and in the event that the tip of the hot water supply pipe 9 freezes, the capacity for expansion and draining is large, making it the most effective in preventing damage to the hot water storage tank 1 due to freezing or negative pressure. .

Further, even if the tip of the hot water supply pipe 9 is accidentally blocked during hot water supply, there is no abnormal pressurization of the hot water storage tank 1, and damage can be prevented.

As described above, this invention has the practical effect of simplifying the structure, improving drainage, preventing freezing, and preventing damage to the hot water storage tank.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view of a route showing one embodiment of this invention;
The figure is the same sectional view showing another embodiment. Note that the same reference numerals in the figures indicate the same parts. 1 is a hot water storage tank, 2 is a hot water supply port, 3 is a water supply port, 9 is a hot water supply pipe, and 10 is a communication pipe.

Claims (1)

[Scope of utility model registration request] A hot water storage tank with a hot water supply port provided above and a water supply port provided below, and a hot water supply pipe with one end communicating with the hot water supply port and the other end open to the atmosphere, and this hot water supply pipe has a hot water supply tank with a hot water supply port provided on the atmospheric communication port side in the pipe. A hot water storage type water heater characterized by having a communicating pipe with one end open and the other end open to the atmosphere outside the pipe.