JPS6034997Y2 - Freezing prevention device for semi-storage water heaters - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an antifreeze device for a semi-storage type water heater.

The can body of a conventional semi-storage type water heater is, for example, made in 1983-
As shown in Publication No. 154454, a hot water supply tank, a water intake tank having a smaller capacity than the hot water supply tank and provided below the hot water supply tank, a large number of heat absorption pipes provided with fins connecting both tanks, and the ends of both tanks. Conventionally, in such semi-hot water storage type cans, a heater is inserted into the water tank, and when the outside temperature drops to around freezing temperature, the heater is energized. Trying to prevent freezing.

However, with this conventional antifreeze device, when the outside temperature drops extremely and the heating capacity of the heater is insufficient, the fins and the vicinity of the hot water tap tank with a large surface area, which are particularly susceptible to the influence of outside temperature, may be at low temperatures. There are problems such as freezing,
In addition, in order to prevent freezing, it was necessary to use a large-sized heater with a large capacity, which resulted in problems such as increased product cost and power consumption. A structure of an instantaneous can body has been disclosed in which a circulation circuit is formed by a bypass path and hot water heated by a heater is circulated to prevent freezing, but semi-hot water storage type cans are heated by heating a burner in the first place. The water in the heat absorption pipe reaches the hot water outlet tank, the low temperature hot water in the hot water outlet tank returns from the return pipe to the water intake tank, and water is supplied from the water intake tank to the heat absorption pipe, keeping the ice in the tank at an appropriate temperature. Regarding the freezing prevention of this type of semi-hot water storage type can, there has not yet been found anything that generates an effective circulating flow by heating the heater.

In view of the above-mentioned problems with the conventional freezing prevention device for semi-storage type water heaters, the present invention is designed to effectively prevent freezing in semi-storage type water heaters by generating circulating flow inside the can by heating the heater. The purpose is to provide a prevention device.

In order to achieve this objective, the present invention has the following structure.

That is, the heater is inserted into the water inlet tank from one side surface on the return pipe side of the water inlet tank, and the upper part of the water inlet tank on the heater side and the side part of the outlet tank on the side diagonally to the heater are inserted. A bypass pipe with an upward slope is provided on the side of the communicating hot water tank.

With this structure of the present invention, the hot water heated by the heater is sent from the heat absorption pipe to the area near the outlet of the hot water tank - the part of the zone that is most likely to freeze, via the bypass pipe, and the hot water is also released from the return pipe. As hot water flows into the tank, the cold water in the heat absorption pipe flows into the water inlet tank, is heated by the heater, and then flows into the hot water tank through the bypass pipe and return pipe, creating a circular flow, which freezes extremely efficiently. Even a small, small-capacity heater can sufficiently prevent freezing.

To specifically explain the embodiment shown below, 1 is a can body of a semi-storage water heater, a hot water tank 2 and a hot water tank 2.
A water tank 3 with a smaller capacity and located at a lower level, a large number of heat absorption pipes 5 provided with fins 4 connecting both tanks 2 and 3, and the ends of both tanks 2 and 3 are frozen in the same way as the heat absorption pipes 5. However, the fins are not attached to the single return pipe 6.

7 is a hot water outlet provided on the top of the hot water tank 2 on the opposite side from the return pipe 6, and 8 is a water inlet similarly provided in the water inlet tank 3. are connected to each other.

Reference numeral 11 denotes a heater for preventing freezing, which is inserted horizontally into the water tank 3 from the inclined surface 12 on the return pipe 6 side of the water tank 3, and a heat sensitive part 1 that is activated when the outside temperature drops to around the freezing temperature.
It is designed to be energized by the operation of step 3.

Reference numeral 14 denotes an exterior body that accommodates the can body 1 and the burner 15 disposed below it.

16 is the upper part of the heater 11 side of the water inlet tank 3 and the hot water outlet tank 2
This bypass pipe connects the heater 11 and the diagonally located side, that is, the lower hot water outlet side, and has an upward slope toward the hot water outlet tank 2 side.

The heat absorbing pipe 5 and the return pipe 6 are connected to the lower part of the hot water tank 2, and a bent part 18 is provided in front of this connecting part 17.

19 is a hot water tap provided at the end of the hot water outlet pipe 9.

The present invention has the above-mentioned structure, and in particular, when the outside temperature is extremely low and the heating capacity of the heater 11 is insufficient, the fins 4, which are easy to sense the outside temperature, can be used. The vicinity of the hot water tap tank 2, which has a large area and surface area, is affected first, and the area from the bent portion 18 of the heat absorption pipe 5 to the vicinity of the hot water tap lower area -
Experiments revealed that freezing begins to progress towards the end of the zone.

Therefore, in the present invention, a bypass pipe 16 is provided that communicates the upper part of the water inlet tank 3 on the side of the heater 11 with the lower part of the hot water outlet side of the hot water outlet tank 2, so hot water heated by the heater 11 is sent into the above part, and This prevents this portion from freezing, and as the hot water from the bypass pipe 16 and the hot water from the return pipe 6 flow into the hot water tank 2, the cold water in the heat absorption pipe 5 flows into the water inlet tank 3. A circulating flow is created in which hot water flows in, is heated by the heater 11, and then flows into the hot water tank 2 from the bypass pipe 16 and the return pipe 6, so that no part of the can body 1 freezes.

As a result, the heater 11 does not need to be disposed over the entire length of the water tank 3, and there is an advantage that the heater 11 can be small enough to withstand use.

As mentioned above, the present invention prevents freezing by generating a circulating flow inside the can body by heating the heater.It is possible to prevent freezing even if the heater is small and has a small capacity, and is practical. It has great value.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a plan view of the can body, and FIG. 2 is a side view of the can body. 1... Can body, 2... Hot water tank, 3.
...Water tank, 4...Fin, 5...
... Endothermic pipe, 6 ... Return pipe, 11 ...
...Heater, 16...Bypass pipe.

Claims (1)

[Scope of utility model registration request] A hot water supply tank, a water intake tank with a smaller capacity and located lower than the hot water supply tank, a number of heat absorption pipes with fins connecting both tanks, and a single return pipe that freezes the ends of both tanks. In a semi-storage type water heater having a can body configured as shown in FIG. A freezing prevention device for a semi-storage type water heater, characterized in that an upwardly sloped bypass pipe is provided on the hot water outlet tank side that communicates with the side portion located diagonally to the heater.