JPS605298Y2 - water heater - Google Patents

Description

[Detailed explanation of the idea] This invention relates to the improvement of water heaters.

Conventional water heaters heat the hot water tank by burning gas, etc., but when the heating surface of the hot water tank is below the dew point temperature (70°C), H2O in the combustion exhaust gas, SO3 condenses on the heating surface and a portion of it evaporates, thereby concentrating.

As a result, H2O and SO3 react to become H2SO4, which passes through the metal on the heating surface and pops the enamel on the inside of the hot water tank, and SO4 oxidizes the metal and creates holes.
The drawback was that the hot water tank had a short lifespan.

This idea was created in view of the above drawbacks, and when the temperature of the heating surface of the hot water tank is below the dew point temperature, excess combustion air is supplied to lower the dew point temperature and prevent condensate from condensing on the heating part. The purpose is to prevent corrosion and provide a water heater with a long life.

Hereinafter, one embodiment of this invention will be explained according to FIGS. 1 and 2. In the figure, 1 is a maximum of 17.5 kg/cT.
The hot water tank is designed to withstand a water pressure of 1.5 ft., and is formed into a spherical shape with the bottom surface serving as the heating surface 1a and protruding upward, and the inner wall of the hot water tank is enamel-treated.

2 is a casing that covers the outer periphery of the hot water tank and supports the hot water tank; 3 is a heat insulating member provided inside the casing to prevent heat radiation from the hot water tank 1 to the outside;
Reference numeral 4 indicates a safety valve that is connected to the hot water tank 1 at one end; 5 is a drain pipe that communicates with the safety valve and is provided to discharge excess water; and 6 is connected to the upper side wall of the hot water tank 1 at one end. a hot water pipe 7 for transporting the hot water in the hot water tank 1 to a predetermined location such as a washroom, bath, shower, etc.;
8 is a hot water tap installed at the downstream end of this water supply pipe and releases hot water at will; 8 is a water supply pipe whose one end is connected to the lower side wall of the hot water tank 1 and supplies water into the hot water tank 1; 9 is this water supply A pressure reducing valve 10, which is provided in the middle of the pipe and controls the water pressure applied to the hot water tank 1 to 0.6 kg/c4, is provided in the middle of the water supply pipe 8 upstream of this pressure reducing valve,
11 is a burner that heats the heating surface 1a of the hot water tank 1; 12 is a fuel pipe that supplies fuel to the burner; 13 is the burner 11;
14 is an intake hose communicating with the blower; 15 is a partition plate provided to form a sealed combustion chamber 16 between the heating surface 1a;
17 is an exhaust pipe that communicates with the combustion chamber 16 and discharges combustion exhaust gas; 18 is a guide pipe provided to improve heating efficiency by the burner 11; and 19 is a temperature sensor that detects the temperature of the heating surface 1a. , the air volume from the blower 13 is controlled when the temperature reaches a predetermined temperature.

In the water heater configured as described above, the fuel pipe 12
In addition to supplying fuel to the burner 11, the blower 13
By supplying combustion air and igniting and burning it with an ignition device (not shown), the heating surface 1a is heated and the exhaust gas is discharged to the outside from the exhaust pipe 17.

- Power water is supplied into the hot water tank 1 with the water pressure controlled to 0.6 kg/cm by the pressure reducing valve 9 by opening the water tap 10, and the water is heated by combustion in the burner 11 described above.

Hot water is obtained by opening the hot water tap 7.

Here, for example, at the start of combustion, the temperature of the heating surface 1a is low, and therefore H2SO1 due to combustion is likely to be raw.

Therefore, the temperature of the heating surface 1a is detected by a temperature detector 19, and if the temperature is below a predetermined temperature, surplus air is supplied during combustion.

This lowers the dew point temperature, making it difficult for the drain to condense, and H2
The production of SO4 will be very low.

Further, when the heating surface 1a reaches a predetermined temperature, the temperature detector 19 detects the temperature, and the amount of air blown is switched to achieve steady combustion.

As explained above, when the temperature of the heating surface of the hot water tank is below a predetermined temperature, surplus air is supplied to the burner for combustion to prevent condensate from condensing on the heating surface. It does not corrode and has a long lifespan.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of this invention, and FIG. 2 is a sectional view of the main part thereof. Note that the same symbols in each figure indicate the same parts, 1 is a hot water tank, 1a is a heating surface, 6 is a hot water pipe, 8 is a water supply pipe, 11 is a burner, 13 is a blower, 16 is a combustion chamber, and 19 is a temperature sensor. It is a vessel.

Claims (1)

[Scope of utility model registration request] A hot water tank provided with a water supply port and a hot water supply port, and a burner for heating the hot water tank, when the temperature of the heating surface of the hot water tank is below a predetermined temperature, excess air is supplied to the burner to cause combustion, A water heater that prevents condensate from condensing on the heating surface.