JPS5852452Y2 - water heater - Google Patents

Description

[Detailed description of the invention] This invention relates to a water heater that receives water from a water tank and uses a water supply pump to take out hot water that is heated in a water storage tank.The main purpose of this invention is to control the water level in the water storage tank. This is to prevent air from being drawn into the water supply pump due to water drop.

As shown in FIG. 1, a typical conventional hot water supply system connects a distiller 4 and a hot water storage tank 1 with a single water supply pipe 5, and connects a boiler 9 with a water supply pipe 5.
The hot water heated in the hot water tank 1 is taken out by the hot water pump 2 through the hot water pipe 3 connected to the upper part of the hot water tank 1. During hot water supply, the piping resistance from the distillation tank 4 to the hot water tank 1 is mainly As a result, as shown in Figure 2, a water level difference occurs between the distiller 4 and the hot water tank 1, and as a result, if the hot water supply speed increases, there is a risk that air will be drawn into the pump 2, but this is normally prevented. In order to do this, a water level detector is provided in the hot water storage tank and the pump 2 is set to stop when the water level falls below a certain level, but this is inconvenient in use.

The present invention has been devised in view of the above points, and will be described in detail below based on Examples.

A distern 4 connected to a water pipe is disposed above the hot water tank 1, and the distern 4 and the hot water tank 1 are connected to a first
A water supply pipe 5 and a second water supply pipe 6 are connected.

The first connecting pipe 5 is connected to the hot water storage tank 1 at the lower end of the hot water storage tank 1, and the second connecting pipe 6 branches from the first connecting pipe 5, penetrates vertically through the upper end of the hot water storage tank 1, and connects its lower end to the hot water storage tank 1. It is located at the inner upper end.

On the other hand, the hot water storage tank 1 is connected to a boiler 9 at the bottom, and the boiler 9 heats and stores the water supplied from the distiller 4, and the heated hot water is passed through the hot water supply pipe connected to the upper side of the hot water storage tank 1. 3 through the action of the hot water pump 2.

At the lower end of the second water supply pipe 6 is a float valve 7 shown in FIG.
is attached.

The float valve 7 includes a cylindrical body 10 connected to the second water supply pipe 6,
It consists of a float 9 that moves up and down between the upper and lower partition plates 11 and 12 of the cylindrical body 10, and through holes 13 and 14 are bored in each of the upper and lower partition plates 11 and 12, and the upper and lower partition plates 11 and 12 A water passage hole 15 is also provided on the side surface of the cylindrical body 10 between the two.

This float 9 is set to have sufficient buoyancy to withstand the water pressure from the cistern 4, and the second water supply pipe 6 is arranged directly below the cistern 4 to reduce piping resistance, and the water supply temperature is To avoid a drop in water supply pipe 3,
It is arranged on the inner periphery of the hot water tank 1 on the opposite side.

When the hot water storage tank 1 is filled with water and the water level exceeds the float 9, the float 9 rises and closes the through hole 13 of the upper partition plate 11, allowing water to be supplied from the tank 4 through the second water supply pipe 6. The water supply pump 2 takes out hot water from the hot water supply pipe 3, and when the water level drops below the float valve 7 as shown by line A-A in the figure, the float 9 descends and opens the float valve 7. , the water supply from the Jistern 4 is carried out through the second water supply pipe 6 which has low resistance, and the water supply speed increases and the water level rises quickly (that is, the pipe length of the second water supply pipe 6 is shorter than that of the first water supply pipe 5). The pipe resistance is small and the pressure loss when flowing with a head is small, and when the diameter of the pipe supplied from the Jistern 4 is constant, the water supply speed is high and the amount of water supplied is large.

), this ensures the amount of hot water taken out from the hot water supply pipe 3 and prevents air from getting into the water supply pump 2.

When the water level recovers to line A-A, water is again supplied via the first water supply pipe 5, and hot water is stored in the upper part of the water tank 1 and taken out from the water supply pipe 3.

In the figure, 16 is an air vent pipe.

[Brief explanation of drawings]

1 and 2 are schematic views showing a conventional example, FIG. 3 is a schematic front sectional view showing an embodiment of the present invention, and FIG. 4 is a front sectional view showing a float valve used in the same. 1 is a hot water tank, 2
3 is a hot water supply pump, 3 is a hot water supply pipe, 4 is a gas tank, 5 is a first water supply pipe, 6 is a second water supply pipe, and 7 is a float valve.

Claims (1)

[Scope of utility model registration request] A hot water storage tank to which a hot water supply pipe for pumping out hot water from inside is connected to the upper part, a distern arranged above the hot water tank, and a first pipe connecting the distern and the lower end of the hot water tank.
A second pipe connects the water supply pipe and the upper end of the water tank.
The water supply pipe is attached to the lower end of the second water supply pipe and operates at a position higher than the connection position of the hot water supply pipe with the hot water storage tank, and when the water level in the hot water storage tank is higher than this position, the second water supply pipe The lower end is closed, and when the water level in the hot water tank is lower than this position, the second
A water heater that consists of a float valve that opens the lower end of the water supply pipe.