JPH0664055U - Antifreeze heater for water heater - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide an antifreezing heater for a water heater, which has excellent heating efficiency and can be realized at a low cost with a simple structure. [Structure] The antifreezing heater 1 of the present invention has a thickness of 0.3 m.
A base 2 which is made of a phosphor bronze plate of m and has a heating element mounting portion 2a formed in a planar shape and a holding portion 2b which is formed in a substantially arc shape below the mounting portion and which is fitted to a water pipe. And a ceramic heater (heating element) 3 which is held and fixed to the heating element mounting portion 2a of the base 2 and is insulated by the silicone rubber sheet 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a freeze prevention heater that is used by being attached to a water supply pipe of a water heater to prevent freezing of water in the pipe, and has a particularly excellent heating efficiency and is devised so that it can be realized at low cost. Regarding what you did.

[0002]

[Prior art]

 As is well known, since water heaters are installed and used outdoors, the water in the water pipe freezes when the outside temperature drops to zero, making water flow impossible. There is a risk that Therefore, conventionally, an antifreezing heater is attached to this water passage pipe to warm and heat the water passage pipe to prevent the water in the pipe from freezing.

Various types of antifreeze heaters have been proposed in the past, and an example thereof is shown in FIG. The antifreezing heater 11 has a recessed embedded portion 12 for accommodating a heating element, which will be described later, on the upper surface thereof, and a ceramic case 13 having a lower surface formed to have a curvature substantially equal to the outer shape circle of the water passage pipe. It is composed of a heating element 15 which is a columnar winding resistance element and is embedded in a recessed embedded portion 12 of a ceramic case 13 by a heat resistant filler 14. Lead wires 15a are connected to both ends of the heating element 15, and the lead wires 15a are led out to the outside from groove portions 13a formed on both wall surfaces of the case 13 in the longitudinal direction. Reference numeral 16 is a sealant for sealing the outlet of the lead wire 15a.

As shown in FIG. 5, the antifreezing heater 11 having the above-described structure is used by being fixed to the water pipe 6 by a dedicated mounting part 17.

[0005]

However, the above-described conventional configuration has the following problems. First, there is the problem of poor heating efficiency. This problem is caused by the fact that the conventional antifreezing heater uses a heating element having a structure in which a resistance wire is wound around a winding core. That is, since the winding resistance element is bulky, a case for accommodating the element is also required to have a large size (a large heat capacity) accordingly. As a result, heat is taken away by the case, and it cannot be efficiently transmitted to the water passage pipe. Another problem is that it is uneconomical. This requires a rather large case for housing the heating element, and requires mounting parts such as special metal fittings when mounting the heater to the water passage pipe, which reduces material and part costs. It was due to the rise.

The present invention has been made to solve the above-mentioned conventional drawbacks, and an object thereof is to have excellent heating efficiency and to realize it with a simple structure at low cost. Another object is to provide a freezing prevention heater for a hot water heater.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the antifreezing heater for a water heater according to the present invention is provided with a heating element element mounting portion formed in a flat shape and a substantially circular arc shape below the mounting portion for fitting into a water passage pipe. It is composed of a base having a holding portion and a heating element arranged on the heating element mounting portion of the base.

Examples of the substrate used in the present invention include a metal plate such as a phosphor bronze plate and a stainless plate having excellent thermal conductivity and spring properties. Further, as the heating element, it is preferable to use a so-called ceramic heater in which a resistance heating layer and an electrode layer are formed on a ceramic substrate. In addition, it is preferable that the holding portion forming the base body covers at least 50% of the outer peripheral portion of the water passage pipe. If it is less than 50%, the holding power to the water passage pipe will be reduced.

[0009]

In the antifreezing heater for a water heater of the present invention having the above-described structure, since the base body is made of the metal plate having excellent thermal conductivity, the heat of the heating element can be efficiently transmitted to the water passage pipe. . Further, since the holding portion formed on the lower surface of the heating element element mounting portion of the base body has a substantially arc shape and has excellent spring property, it can be easily attached to the water passage pipe by fitting. The workability is improved and the cost can be reduced because the mounting parts can be omitted. Further, since the thin plate-shaped ceramic heater is used as the heating element, the antifreeze heater can be made compact, and the heat absorption of the antifreeze heater itself can be suppressed and the heating efficiency to the pipe can be improved. It is possible to reduce the material cost and it is economically superior.

[0010]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. The freeze prevention heater 1 according to the present embodiment has a structure as shown in FIG. First, reference numeral 2 is formed continuously with a heating element mounting portion 2a (vertical 10 mm, horizontal 25.5 mm) for mounting the heating element 3 and below the heating element mounting portion 2a. And a holding portion 2b (having a length of 11 mm and a width of 15 mm) which has an inner diameter of and is bent into a substantially arc shape. The substrate 2 has a thickness of 0 .. It is constructed by punching out a 3 mm phosphor bronze plate. Reference numeral 2c is a claw portion continuously provided at the four corners of the heat generating element mounting portion 2a, and the heat generating element arranged on the heat generating element mounting portion 2a by bending the claw portion 2c with a press or the like. The element 3 is firmly held and fixed. If the thickness (L) of the base body 2 is too thick, the heat conductivity is poor and the cost is high, and if it is too thin, the springiness of the holding portion 2b is poor and the holding power to the water passage pipe is reduced. It is not preferable because it does. Normally 0. It may be about 2 mm to 0.5 mm, but in the present embodiment, the balance between the thermal conductivity and the spring property is set to 0.3 mm.

The heating element 3 has a resistor layer 3b formed by printing on an alumina-based ceramic substrate 3a having a length of 10 mm, a width of 25.5 mm, and a thickness of 0.8 mm, and both ends of the resistor layer 3b. This is a ceramic heater configured by connecting lead wires 3c made of a fluororubber insulation-coated electric wire by soldering. The heating element 3 is adhered and arranged on the upper surface of the amorphous glass thin film 3d coated on the resistor layer 3b by a heat-resistant adhesive 4 made of a one-component thermosetting silicone rubber LTV. It is insulated with a 0.3 mm thick silicone rubber sheet 5. In this embodiment, a fluorine rubber insulation covered electric wire is used as the lead wire, but a silicone rubber insulation covered electric wire, a fluorine resin insulation covered electric wire or the like may be used as long as it has excellent heat resistance. Further, in place of the silicone rubber sheet arranged on the heating element, a tape having excellent heat resistance and insulation such as glass tape or Teflon tape may be used. By doing so, a heat resistant adhesive such as silicone rubber LTV can be omitted, and the cost can be further reduced.

Here, the temperature rise characteristics of the pipe when the antifreezing heater 1 according to the above-mentioned embodiment was attached to the water passage pipe 6 as shown in FIG. 2 were measured. The measurement condition is a resistance value of 146. A 1Ω antifreeze heater 1 was fitted into the center of a copper water pipe 6 with a diameter of 12.72 mm and a length of 200 mm, and an electric current was applied to the antifreeze heater to generate heat in the absence of water. The temperature change of each part of the pipe due to the change was measured. The measurement points are the upper part of the antifreeze heater 1 (point A), the contact point between the antifreeze heater 1 and the water passage pipe 6 (point B), and the water pipe 100 mm away from the center of the antifreeze heater (point C). ). For comparison, the conventional freeze prevention heater 11 shown in FIG. 4 was also measured under the same conditions as shown in FIG.

FIG. 3 is a diagram showing the measurement results. In the figure, the solid line shows the measured value of the antifreezing heater of the present invention, and the dotted line shows the measured value of the conventional antifreezing heater. According to this, when the antifreezing heater according to the present invention is used, a higher temperature is obtained at the same electric power value as compared with the conventional product, and the graphs at the measurement points A, B and C are close to each other. I understand that Therefore, it can be said that the thermal conductivity to the water pipe is improved and the heating efficiency is excellent.

The present invention is not limited to the above embodiment. For example, in the present embodiment, the heating element is held and fixed by the claw portion provided on the substrate, but the claw portion may be omitted and the heat generating element may be bonded and fixed to the heating element mounting portion with a heat-resistant adhesive. good. Further, the shape and size of the holding portion may be appropriately set according to the diameter of the water pipe to be mounted.

[0015]

[Effect of device]

 As described in detail above, according to the present invention, the following effects can be obtained. First, it was possible to efficiently transfer the heat of the heating element to the water pipe via the metal plate having excellent thermal conductivity. Moreover, it is only necessary to attach the holding part to the pipe to attach it to the water flow pipe, and no attachment parts are required. Therefore, the heater can be easily attached and detached, the location of the attachment can be easily moved, and the attachment work becomes very easy. From these, it is possible to provide a low-cost antifreezing heater for a water heater, which has excellent heating efficiency.

[0016]

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of the present invention, in which (a) is an exploded perspective view and (b) is a sectional view.

FIG. 2 is a view showing an embodiment of the present invention and is a side view showing a state of attachment to a water passage pipe.

FIG. 3 is a graph showing measurement results of temperature rising characteristics of the antifreezing heaters of the present invention and the conventional example.

FIG. 4 is a view showing a conventional example, (a) is a perspective view and (b) is a sectional view.

FIG. 5 is a view showing a conventional example, and is a side view showing an attached state to a water passage pipe.

[Explanation of symbols]

 1 Antifreeze Heater 2 Base 2a Heater Element Mounting Part 2b Holding Part 2c Claw Part 3 Heater Element 3a Ceramic Substrate 3b Resistor Layer 3c Lead Wire 3d Amorphous Glass Thin Film 4 Heat Resistant Adhesive 5 Silicone Rubber Sheet 6 Water Pipe

Claims (1)

[Scope of utility model registration request] 1. A base having a heating element mounting portion formed in a flat shape and a holding portion formed in a substantially arc shape below the mounting portion and fitted into a water passage pipe, and the heat generation of the base. An antifreezing heater for a water heater, which comprises a heating element arranged in a body element mounting portion.