JPS6231823Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a hot water supply system that includes a water inlet tank with connected water supply pipes, a hot water outlet tank installed above the water inlet tank, and a heat exchanger having a large number of heat absorption pipes connecting both tanks. This invention relates to anti-freezing devices in boilers.

Conventionally, this type of device has been designed to prevent freezing by inserting a heater into the water inlet tank and creating convection between the water heated by the heater in the inlet tank and the water in the upper hot water outlet tank. In this case, the heater is generally inserted into the water tank in the longitudinal direction so that the water in the water tank is heated over a wide range. According to this, heated water is now raised to the hot water tank through multiple heat absorption pipes facing the heating range of the heater, and when the burner is not in operation, the heat absorption pipes are
Since it acts as a heat dissipation tube, the amount of heat dissipated when the heated water rises increases, resulting in an increase in heat loss.

The purpose of the present invention is to provide a device that eliminates such inconveniences, and includes a water inlet tank 2 to which a water supply pipe 1 is connected, a hot water outlet tank 3 provided above the water inlet tank 2, and both tanks. In a water heater equipped with a heat exchanger 5 having a large number of heat absorption pipes 4 connecting two heat absorption pipes 2 and 3, the water supply pipe 1 among the heat absorption pipes 4
A freezing prevention device for a water heater, in which a heater 6 is inserted from the water inlet tank 2 side into a heat absorption pipe 4 connected to the water inlet tank 2 in the vicinity of the connection part. In the illustrated example, the water tank 2 is equipped with a water supply pipe 1 at one end in the longitudinal direction, and the heat exchangers 5 are provided in two stages, upper and lower. Heater 6 was inserted.

In the drawing, 7 is a heat absorption fin provided on the heat absorption pipe 4, 8 is a return pipe connecting the water inlet tank 2 and the hot water outlet tank 3 at the other end, 9 is a hot water outlet pipe connected to the hot water outlet tank 3, and 10 is a heat exchanger. 5 shows the lower burner.

Next, to explain its operation, when the heater 6 is energized when the burner 10 is not in operation, the heated water rises into the hot water tank 3 through the heat absorption pipe 4 at one end into which it is inserted, and the water inside the tank 3 rises. Relatively low-temperature water descends into the water tank 2 through another heat absorption pipe 4 and return pipe 8, causing water convection between both tanks 2 and 3, and with this convection, water inside both tanks 2 and 3 The temperature of the water in each heat absorbing pipe 4 is raised sequentially, but since most of the heated water rises from the inlet tank 2 to the outlet tank 3 through the heat absorbing pipe 4 at one end, the temperature of each heat absorbing pipe 4 is set at the second end. When measured at points A to E in the figure, as shown in FIG. Even if heat is radiated from the heat absorption pipe 4 at one end, the total amount of heat radiated when the heated water rises to the hot water tap tank 3 is kept extremely small, and therefore the heat loss is also reduced.

Furthermore, by heating the heater 6 with electricity, heat is also applied to the water supply pipe 1 near the location where the heater 6 is disposed, and water therein is also prevented from freezing.

As described above, according to the present invention, among the heat absorption pipes 4 connecting the water inlet tank 2 and the hot water outlet tank 3, the heat absorption pipe 4 connected to the water inlet tank 2 near the connection part of the water supply pipe 1 is connected to the water inlet tank 2. Heater 6 from the side
Most of the water heated by the heater 6 rises to the hot water tank 3 through the heat absorption pipe 4 into which the heater 6 is inserted, and heat dissipation from other heat absorption pipes 4 is suppressed. The water in the tanks 2 and 3 can be heated while reducing heat loss as much as possible, and the water in the water supply pipe 1 is also heated by the heat from the heater 6, so that the water heater can be reliably protected from freezing. have an effect.

[Brief explanation of the drawing]

FIG. 1 is a side view of one example of the present device, FIG. 2 is a plan view taken along the line -- in FIG. 1, and FIG. 3 is a diagram showing its characteristics. 1... Water supply pipe, 2... Water inlet tank, 3... Hot water outlet tank, 4... Endothermic pipe, 5... Heat exchanger, 6...
heater.

Claims (1)

[Scope of utility model registration request] A water boiler comprising a water inlet tank 2 connected to a water supply pipe 1, a hot water outlet tank 3 provided above the inlet water tank 2, and a heat exchanger 5 having a large number of heat absorption pipes 4 connecting both the tanks 2 and 3. A freezing prevention device for a water heater, in which a heater 6 is inserted from the water inlet tank 2 side into the endothermic pipe 4 which is connected to the water inlet tank 2 near the connecting part of the water supply pipe 1. .