JPS62764A - Fixing device of antifreezing heater for water heater - Google Patents

Abstract

PURPOSE:To transfer the heat of a heater to the water in a water tube and obtain the fixing device of the heater with a simple structure by a method wherein the water tube, fixed to a drum, is pinched by pawls formed on both ends of the fixing fitment having substantiallty U-shape while the antifreezing sheath heater is pushed by cut-and- raised pieces, formed on the fixing fitment, to adhere the heater to the water tube. CONSTITUTION:The water tube 20 is arranged so as to be contacted with the antifreezing sheath heater 17 and the heater 17 is fixed to the water tube 20 so as to be pushed against and adhered to the water tube 20 by a method wherein the fixing fitment 18 is formed into substantially U-shape and the cut-and-raised pieces 18b are provided at the central part thereof to push the heater 17 against the water tube 20 by the pieces 18b while the pawls 18a, provided at both ends of the fitment, are formed so as to ride over two pieced of water tubes 20 and pinch them. In the very cold season of winter, water temperature in a water flow path is detected by a freeze preventing switch 15 in the hot-water heater and when it becomes 2-5 deg.C, a heater 17 is conducted to rise temperature. Most of the heat is transferred direct to the water tubes 20 substantially from the heater 17 and water temperature is raised. When the water temperature of the switch 15 becomes 30-40 deg.C, the conduction of the heater 17 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a fixing device for attaching an electric heater to a water heater for home use to prevent freezing.

BACKGROUND OF THE INVENTION Generally, sheathed heaters are used to prevent water heaters from freezing.

An example of the above-mentioned conventional freeze prevention sheathed heater fixing device will be described below with reference to the drawings.

FIG. 5 shows a sectional view of a conventional fixing device for an antifreeze sheathed heater. Reference numeral 23 denotes a combustion chamber, which is surrounded by a drum 13 to which a water tube 20 is tightly attached. At the upper opening of this drum 13, a large number of fins 22 are arranged in parallel, and a fin pipe 2 passes through the fins and communicates with the water pipe 20.
1 constitutes a heat exchanger for a hot water unit. A metal fitting 13a is fixed to the drum 13 by brazing or the like in the shadow of the water pipe 20 of this drum 13, and the sheathed heater 17 is pressed against the drum 13 with a holding metal fitting 13b, and a holding metal fitting 13b is fixed to the metal fitting 13a with screws 25. was.

The operation of the freeze prevention sheathed heater fixing device for a water heater constructed as described above will be described below.

Normally, the water pipe 20 is filled with water, and when the water heater is installed outdoors and the temperature drops to 2 to 5 degrees Celsius during severe winter weather, knowing this low temperature, a separate temperature controller is installed inside the water heater. A sensing switch (not shown) VC energizes the sheathed heater 17, which heats the drum 13 and the water in the water pipe 2o. When the water temperature in the water pipe 20 reaches a certain temperature, the temperature sensing switch stops the power supply to the sheathed heater 17, thereby preventing the water heater from freezing.

Problems to be Solved by the Invention However, in the above configuration, the sheathed heater 17
is in close contact with the drum 13, and the heat of the sheathed heater 17 is indirect heating that first heats the drum 13, raises the temperature of the drum 13, and then heats the water tube 20 by heat conduction of the drum 13. Water pipe 2 to effectively utilize heat from 17
There was a problem in that it could not be used to heat water inside the room.

In view of the above-mentioned problems, the present invention provides a fixing device for a sheathed heater for effectively adding heat from a sheathed heater to water in a water pipe and for preventing freezing of a water heater with a simple configuration.

Means for Solving the Problems In order to solve the above problems, the fixing device for the antifreeze sheathed heater for water heaters of the present invention is fixed to the drum using claws formed at both ends of a substantially U-shaped fixture. The water pipe is held between the water pipes and the sheathed heater is pressed by the cut-and-raised piece formed on the fixing tool to bring it into close contact with the water pipe.

Effects of the present invention With the above-described configuration, the sheathed heater is set in contact with the water tube of the drum, and by simply attaching the fixing device to the water tube using the claw of the approximately U-shaped fixing device, the cut and raised piece is pressed into contact with the sheathed heater. The heater can be brought into close contact with the water pipe, and the heat of the sheathed heater is directly conducted to the water pipe, so that the water in the water pipe can be efficiently heated.

EXAMPLE Hereinafter, a fixing device for a sheathed heater for preventing freezing of a water heater according to an example of the present invention will be described with reference to the drawings. FIG. 1 shows a sectional view of a fixing device for a sheathed heater for preventing freezing of a water heater in accordance with an embodiment of the present invention. Fig. 2 is a perspective view of the fixing fitting, which is the main part of the fixing device of the present invention;
The figure is an external view of an outdoor hot water heater using the fixing device of the present invention, and FIG. 4 is an internal view of FIG. 3. In Figure 3, 1
3 is the main body casing, 2 combustion air intake ports, and 3 a combustion exhaust gas discharge port. In FIG. 4, 8 is a fuel inlet, 9 is a fuel control valve, 10 is a fuel pipe, 11 is a nozzle holder, and 6 is a burner box containing a burner inside. 1
2 is the water inlet, which connects to the city water supply. A 15t/i freeze prevention switch is installed close to the water inlet 12. 20 is a water pipe connected to the water inlet 12, and is connected to the drum 1 of the heat exchanger.
It is closely attached to the outer peripheral surface of No. 3 by brazing. Reference numeral 17 denotes a sheathed heater for freezing prevention, which has a substantially U-shape and is in contact with the water pipes 20 at regular intervals from above and below. Reference numeral 18 denotes a fixture for directly fixing the sheathed heater 17 to the water pipe 2o. 14
is the hot water outlet, which leads to the kitchen, bathroom, etc. and is connected to the hot water tap. Reference numeral 7 denotes an exhaust fan that introduces combustion air from the combustion air intake port 2 into the lower space 5 of the main body casing 1. Then, in the burner box 6, fuel controlled by the fuel control valve 9 is supplied through the fuel vibrator 10 and the nozzle holder 11, and is combusted by the burner in the burner box 6.
2, the water exchanges heat with the water flowing in through the water pipe 20, and the water becomes hot water, which is led to the kitchen, bathroom, etc. through the hot water supply outlet 14, and is discharged from the hot water tap. On the other hand, the exhaust gas after heat exchange in the heat exchanger 24 passes through the exhaust fan 7 and is discharged from the exhaust pipe 4 to the outside of the machine through the combustion exhaust gas discharge port 3. 19 is a controller,
This is to control the fuel and exhaust fan and obtain the hot water temperature as set.

In FIG. 1, the heat exchanger 24 is connected to the drum 13 by water pipes 20
are closely brazed to form a cylindrical shape, and a combustion chamber 23 is constructed by placing a fin block through which water pipes 21 are completely passed through a large number of fins 22 arranged in parallel at the upper opening of the fin block. As shown in FIG. 4, a U-shaped sheathed heater 17 for preventing freezing is installed between the water pipes 20 of the heat exchanger 24.
The fixture 18 shown in FIG.
It is fixed at. That is, the fixture 18
As shown in the figure, a metal plate is formed into a substantially U-shape, and both ends are bent inward to form claws 18a, and an integrated VC is formed inward at the center.
A cut and raised piece 18b is provided. Then, put this fixing tool over the two wooden water pipes 20 and
When the hook 8a crosses the water tube 20 and reaches the drum 13 side, the hook 18a clamps the water tube 20 by the elastic force of the claw 18a, thereby fixing the fixture 18 to the water tube 20 only by contacting the end surface thereof. On the other hand, when the fixture 18 is attached, the cut-and-raised piece 18b of the fixture 18 comes into elastic contact with the sheathed heater 17 for anti-freezing and presses it, bringing it into close contact with the water pipe 20. 26
is a gap formed between the water pipe 20 and the fixture 18.

The operation of the fixing device for the antifreeze sheathed heater of the water heater constructed as described above will be described below with reference to FIGS. 1, 2, and 4.

First, FIG. 1 shows a fixing device for an anti-freezing sheathed heater of a heat exchanger of a water heater, in which an anti-freezing sheathed heater 17 is in close contact with a water pipe 20.

During the severe winter season, the freeze prevention switch 15 in the water heater shown in Fig. 4 detects the water temperature in the water passage, and when it reaches 2 to 5 degrees Celsius, it is turned on and the freeze prevention sheathed heater 17 is energized.
Temperature rises. Most of this heat is directly conducted from the antifreeze sheathed heater 17 to the water pipe 20, and the water temperature rises. Of course, there is also one that conducts heat to the water via the drum 13 and water pipe 20.

As the temperature of the water in the water pipe 2o rises, natural convection of water occurs within the water pipe, and when the water temperature of the freeze prevention switch 15 reaches 30 to 40°C, it is turned off and the electricity to the freeze prevention sheathed heater 17 is stopped. Ru. By repeating this process, the water in the water pipe 20, that is, the heat exchanger 24 of the water heater, is prevented from freezing.

As described above, according to the Kino-ryu side, the anti-freezing sheathed heater 17 is disposed in close contact with the water pipe 2o, and in order to tightly press and fix the anti-freezing sheathed heater 17 to the water pipe 20, the fixture
8 is approximately U-shaped, and a cut and raised piece 18b is provided in the center to press the antifreeze sheathed heater 17, and at the same time, the claws 18a at both ends are shaped to straddle and hold the two water pipes 20. As a result, the antifreeze sheathed heater 17 can be tightly fixed to the water pipe 20 under pressure.

Effects of the Invention As described above, the present invention has main claws at both ends of a substantially U-shaped fixture, and attaches the fixture by sandwiching the water pipe in which the U-shaped sheathed heater 17 is fixed to two wooden drums. At the same time, a heater such as a sheathed heater is tightly pressed against the water pipe using the cut-and-raised piece provided on the fixing device, and the anti-freeze heater can be easily fixed directly and closely to the water pipe, and the heat of the anti-freeze heater can be easily fixed tightly to the water pipe. can be effectively conducted to the water in the water pipes, resulting in energy savings.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a fixing device for a sheathed heater for preventing freezing of a water heater according to an embodiment of the present invention, FIG. 2 is a perspective view of a fixing device for the sheathed heater for preventing freezing, and FIG. FIG. 4 is a front view of the exterior appearance of a water heater equipped with a sheathed heater fixing device, and FIG. FIG. 5 is a sectional view of a conventional fixing device for a sheathed heater for preventing freezing of a water heater. 13...Drum, 17...Sheathed heater (heater), 18...Fixing tool, 18a...
...Claw, 18b... Cut piece, 20...
・Water pipe, 24...Heat exchanger. Name of agent: Patent attorney Toshio Nakao and 1 other person/3
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Claims (1)

[Claims] A drum having a water pipe fixed to its surface, an anti-freeze heater brought into close contact with the water pipe, claws for holding the water pipe formed at both ends bent into a substantially U-shape, and pressing the anti-freeze heater. A fixing device for a sheathed heater for preventing freezing of a water heater, comprising: a fixing tool having a cut and raised piece that is brought into close contact with the water pipe.