JPS605295Y2 - hot water storage type water heater - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improvement of a hot water storage type water heater.

Conventional hot water storage type water heaters generally have a combustion chamber located at the bottom of the hot water storage tank and a flue running vertically from the combustion chamber in the center of the waist hot water storage tank.

For this reason, when combustion in the combustion chamber is stopped after heating the inside of the hot water storage tank to a high temperature, the air in the combustion chamber and the flue is released from the hot water storage tank side to the outside of the vessel through the heating flue.

This allows cool air to flow into the combustion chamber and flue.

Because this process is repeated, there is a drawback that heat radiation during non-combustion is large and maintenance costs are high.

The present invention has been made to solve the above-mentioned drawbacks, and one embodiment thereof will be described below with reference to the accompanying drawings.

In FIG. 1, 1 is a heating section and 2 is a hot water storage tank.

3 is a circulation suction pipe connecting the heating section 1 and the lower part of the hot water storage tank 2; 4 is a water supply pipe connected to the upstream side of the circulation suction pipe 3;
5 is a pressure reducing valve provided in the middle of the water supply pipe 4.

6 is a circulation pump connected between the heating section 1 and the water supply pipe 4 connection; 7 is a water flow detector that detects the water flow in the circulation suction pipe 3 by the operation of the circulation pump 6; for example, a diaphragm with a built-in diaphragm 8; Body, 9 is water flow detector 8
It is a water flow switch that is linked to the

Reference numeral 10 denotes a circulating discharge pipe connecting the outlet of the heating section 1 and the hot water storage tank 2, which has a branch part 11 in the middle, has a switching valve 12 in the branch part 11, and connects one end to the lower part of the hot water tank 2, and the other end to the upper part of the hot water tank 2. is connected to.

13 is a heat exchanger provided in the heating section 1;
is a combustor that heats the heat exchanger 13, and 15 is a pilot burner.

16 is a gas passage, which includes a gas cock 17, a solenoid valve 18,
The nozzles 19 are lined up in sequence.

A cock interlocking switch 20 is attached to the gas cock 17.

21 and 22 are heat-sensitive parts and contacts of a thermostat that detect the temperature of hot water in the hot water storage tank 2, and 23 and 24 are heat-sensitive elements that detect the temperature of hot water at the outlet of the heating unit 1 and the temperature of hot water in the upper part of the hot water storage tank 2.

25 is a rectifier that rectifies the flow of hot water in the hot water storage tank 2; 26;
is a heat insulating material that keeps the hot water storage tank 2 warm.

27 is a hot water supply pipe connected to the upper end of the hot water tank 2; 28.
29 is an air bleed valve and a pressure release valve.

30 is a faucet or a mixing faucet attached to the tip of the hot water supply pipe 27.

Reference numeral 31 is a control box that electrically compares the signals from the heat sensitive elements 23 and 24 and issues a signal to operate the switching valve 12.

FIG. 2 is a wiring diagram of the electric circuit of the present invention. In the figure, 33 is a power source, and 34 is a change-over valve switch that turns on and off electricity to the change-over valve 12.

The other components have been described in FIG. 1 and will therefore be omitted here.

Next, the effect will be explained.

In FIGS. 1 and 2, gas cock 17 is opened to supply gas to pilot burner 15, and at the same time ignite it by appropriate means.

This operation closes the cock interlock switch 20.

As a result, gas is guided through the gas passage 16 to the solenoid valve 18.

At this time, the temperature of the water in the hot water tank 2 is
If the operating temperature is below 1, the contact 22 is closed, so
Pump 6 and control box 31 are energized and operated.

As a result, the water flow detector 8 detects the water flow in the circulating suction pipe 3 and is pushed upward, so that the water flow switch 9 is closed and the electromagnetic valve 18 is energized.

As a result, the solenoid valve 18 is opened, and the gas is guided to the combustor 14 through the nozzle 19, ignited by the pilot burner 15, and combusted, thereby heating the water passing through the heat exchanger 13.

The hot water heated by the heat exchanger 13 is circulated through the discharge pipe 10
At this time, the hot water temperature at the heating section 1 outlet and at the top of the hot water storage tank 2 is detected by the heat sensitive elements 23 and 24, and the signals are led to the control box 31, where they are compared and the hot water temperature is When the hot water temperature is lower than the upper part of the hot water tank 2, the changeover valve switch 34 is opened as shown in FIG. 2, the changeover valve 12 is in the state shown in FIG. 2 is guided to the lower part and the pump 6
is guided to the heating section 1.

Next, if the hot water temperature at the outlet of the heating section 1 is higher than the upper part of the hot water storage tank 2, a signal from the control box 31 is sent to the second
The change-over valve switch 34 shown in the figure is closed, the change-over valve 12 of the branch part 11 is energized, the hot water moves to the right, and the flow of hot water to the lower part of the hot water tank 2 is stopped, and high-temperature water enters from the upper part and is stored.

This operation is repeated, and when the thermostat heat sensitive part 21 reaches the operating temperature, the contact point 22 is opened, the pump 6 stops, and the water flow detector 8 detects that the water flow in the circulation suction pipe 3 has stopped and moves downward.

As a result, the water flow switch 9 is opened, power supply to the electromagnetic valve 18, control box 31, and switching valve 12 is stopped, gas supply to the combustor 14 is stopped, and combustion is stopped.

Further, the switching valve 12 is in the state shown in FIG.

Next, when the faucet 30 at the tip of the hot water supply pipe 27 is opened to supply hot water, the water flows backward from the water supply pipe 4 through the circulation suction pipe 3, stays in layers from the bottom of the hot water storage tank 2, and pushes up the hot water. When it reaches the thermostat heat sensitive part 21, heating is performed by the above-mentioned action.

A rectifier 25 is provided so that when the pump 6 is operating and water enters the hot water storage tank 2, the hot water in the lower and upper parts of the hot water storage tank 2 is not mixed and the high temperature water always remains in the upper part.

In addition, if the gas cock 17 is closed when not in use, the cock interlocking switch 20 will remain open even if the temperature inside the hot water storage tank 2 is low, so no electricity will be applied to the electric circuit in Figure 2, so the heating operation will not start. No.

As described above, according to the present invention, high-temperature water is always stored in the upper part of the hot water storage tank, so hot water is always supplied at high temperature, and there is little fluctuation in hot water temperature.

In addition, in a non-combustion state where high-temperature water is obtained in a short time after the combustor starts combustion, and the temperature inside the hot water storage tank becomes high and combustion in the combustor stops, heat is released from a small amount of hot water in the heat exchanger and from the wall of the hot water storage tank. It only releases heat and is a fraction of the amount of conventional hot water storage type, etc.
It is possible to provide a hot water storage type water heater that has numerous advantages over conventional hot water storage type water heaters.

[Brief explanation of the drawing]

FIG. 1 is a schematic structural diagram of one embodiment of the present invention, and FIG. 2 is an electrical circuit diagram thereof. 1 is a heating section, 2 is a hot water storage tank, 3 is a circulation suction pipe, 4 is a water supply pipe, 6 is a pump, 9 is a water flow switch, 10 is a circulation discharge pipe, 12 is a switching valve, 21 is a heat sensitive part of a thermostat, 23. 24 is a heat sensitive element, 27 is a hot water supply pipe, and 31 is a control box.

Claims (1)

[Scope of utility model registration request] Separate the heating section and hot water storage section, connect the lower part of the hot water storage tank and one opening of the heating section with a circulation suction pipe, install a circulation pump on this pipe, and connect a water supply pipe between the pump and the hot water storage tank, A circulating discharge pipe connecting the outlet and the hot water storage tank is branched in the middle, an electrically operated switching valve is provided there, and one of the circulating discharge pipes is connected to the upper part of the hot water tank and the other to the lower part,
In addition, a hot water supply pipe is connected to the upper end of the hot water storage tank, and a heat-sensitive part of a temperature control thermostat is installed inside the hot water storage tank to detect this temperature, turn on and off the combustor, start and stop the pump, and also control the heating part outlet. A hot water temperature detection element is installed at the top of the hot water storage tank, and the hot water temperature is detected and electrically compared by the controller. If the hot water temperature at the outlet of the heating section is lower than the hot water temperature at the top of the hot water storage tank, circulating water is removed from the bottom of the hot water storage tank. and when the hot water temperature at the outlet of the heating section is higher than the hot water temperature at the upper part of the hot water storage tank, the switching valve is automatically operated to supply hot water from the upper part of the hot water storage tank.