JPH0511390U - Circle heater - Google Patents

Abstract

(57) [Abstract] [Purpose] When turned on, the filament coil 21 that glows red becomes a perfect circle, which is visually pleasing and has a good temperature distribution, and the wiring is easy to handle and the pinch seal part
Provide a circle heater that is less likely to crack in 13. [Structure] A valve 1 includes an annular portion 11, a pair of pinch seal portions 13 that are parallel to each other and are close to the outside of the annular portion 11, and an annular portion.
A pair of arc-shaped connecting parts that connect 11 and the pinch seal part 13.
In a circle heater consisting of 12, a pair of connecting parts 12
Cross so that they do not touch each other. As a result, when viewed from the top, the filament coil 21 in the bulb 1 becomes circular without interruption, and the pair of outer leads 25 extend in the same direction and the distance between them becomes narrower, which facilitates wiring. It will be easy. Then, the pinch seal is performed from the side surface direction of the annular portion 11 to strengthen against the bending load applied when the pinch seal portion 13 is held.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a circle heater used as a heat source for an electric cooking stove for cooking.

[0002]

[Prior Art]

 Electric cooking stoves that use a heater lamp as a heat source have received a great deal of attention in recent years and have already been put to practical use because the temperature rises immediately after electricity is turned on, and it is easy to give a feeling of cleanliness and luxury. Conventionally, as a heater lamp, a tubular halogen incandescent light bulb in which a filament is arranged in a straight tube made of quartz glass is often used, and a plurality of heater lamps are arranged in parallel in a casing. Then, the upper opening of the casing is covered with heat-resistant glass, and a heating object such as a pot is placed on this glass for cooking. However, since the bottom of an object to be heated, such as a pot, is usually circular, a heater lamp with an annular bulb, that is, a circle heater, has a better heat distribution and higher heat utilization efficiency. Is big.

In the circle heater, the buried metal foil made of molybdenum oxidizes when the temperature of the pinch seal portion becomes high, so the pinch seal portion needs to be exposed to the outside of the casing. For this reason, conventionally, the valve 1 of the circle heater is, as shown in FIG. 2, crossed at both ends of the annular portion 11 to the extent that they do not contact each other, that is, the annular portion 11 is bent to a spiral with a small pitch. However, the straight part 14 is integrally connected to the tip. Then, the pinch seal portions 13 are formed at the tips of the linear portions 14, respectively. Therefore, the pair of outer leads 25 extending from the pinch seal portion 13 extend in mutually opposite directions, and the distance between them is extremely large. Further, since about four circle heaters are arranged in the electric cooking stove, there is a problem that the wiring arrangement becomes extremely complicated.

Therefore, the circle heater shown in FIG. 3 has been proposed. In other words, the valve 1 of the circle heater connects the annular portion 11, the pinch seal portion 13 arranged in parallel close to the outside of the annular portion 11, and the annular portion 11 and the pinch seal portion 13 to each other. It consists of 12 arc-shaped connecting parts. Therefore, since the pair of outer leads 25 extending from the pinch seal portion 13 extend in the same direction and the intervals between them are narrow, the wiring can be easily routed.

[0005]

[Problems to be solved by the device]

 However, the space between the connecting portions 12 and the connecting portion 12 is required to be about 25 mm in the manufacturing process, and the filament coil 21 does not exist in this portion. In other words, the filament coil 21 which glows red when turned on does not have a perfect circular shape. Therefore, it is unfavorable in appearance and has a problem in temperature distribution. Furthermore, since the pinch seal parts 13 are close to each other and are on the same plane as the annular part 11, the pinch seal can be performed only in the vertical direction of the annular part 11. That is, the flat pinch seal part 13 is oriented horizontally. By the way, since the circle heater is attached to the electric cooking stove in a horizontal posture while holding the pinch seal portion 13, a vertical bending load is applied to the pinch seal portion 13. However, since the flat pinch seal portion 13 is horizontally oriented, it is weak against this bending load, and there is a problem that cracks easily occur in the pinch seal portion 13.

Therefore, in the present invention, when turned on, the filament coil that shines red becomes a perfect circle, which is visually pleasing and has a good temperature distribution. Moreover, the wiring is easy to handle and cracks are unlikely to occur in the pinch seal portion. The purpose is to provide a simple circle heater.

[0007]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention provides a valve having an annular portion, a pair of pinch seal portions that extend in parallel to and approach the outside of the annular portion, and the annular portion and the pinch seal portion. In a circle heater composed of a pair of arc-shaped connecting parts to be connected, the pair of connecting parts are crossed to each other to the extent that they do not contact each other, and pinch-seal is performed from the lateral direction of the annular part.

[0008]

[Action]

 That is, since the pair of connecting portions are crossed to each other so that they do not contact each other, the filament coil in the valve has a perfect circle when viewed from the top without a break. Therefore, when turned on, the temperature distribution is improved visually and is improved. The pair of external leads extending from the pinch seal portion at the tip of the connecting portion extend in the same direction, and the distance between them is narrow, so that the wiring can be easily routed. Also, since the pinch seal is performed from the side of the annular part, the pinch seal part is oriented vertically. Then, while holding this vertically oriented pinch seal part and attaching the circle heater to the electric cooking stove, if the flat pinch seal part is held vertically, the vertical bending load that acts on the pinch seal part Has the advantage of becoming stronger.

[0009]

【Example】

 The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 shows a circle heater with a power consumption of 1000 W. The valve 1 is formed by bending a quartz glass with an outer diameter of 8 mmφ, and an arc-shaped connecting portion 12 with a small radius of curvature is continuous to both ends of an annular portion 11 with an inner diameter of 120 mmφ. . Here, the connecting portions 12 cross each other to the extent that they do not contact each other. In other words, the annular portion 11 makes almost one turn with a spiral having an extremely small pitch, and the connecting portion 12 is continuous to the tip thereof. A pinch seal portion 13 is formed at the end of the connecting portion 12, and a pair of pinch seal portions 13 are closely arranged and parallel to each other. Here, since there is a level difference between the pinch seal parts 13 in the vertical direction, it is possible to perform pinch seal from the side direction of the annular part 11, and the flat pinch seal part 13 is formed on the surface made by the annular part 11. In contrast, it is oriented vertically. Then, a small amount of halogen gas is enclosed in the bulb 1 together with the inert gas.

Next, the structure of the filament assembly 2 will be described. A plurality of ring anchors 22 are attached to a filament coil 21 in which a tungsten element wire is wound around a single coil, and the ring anchor 22 is an annular ring. The filament coil 21, which is a heat generating portion, is inscribed inside the portion 11 or the connecting portion 12 and is held along the axis of the annular portion 11 or the connecting portion 12. Therefore, when viewed from the top, the filament coil 21 in the bulb 1 has no cut and has a perfect circular shape. Then, the ends of the inner lead 23 extending from the filament coil 21 are welded to the metal foil 24 embedded in the pinch seal portion 13, and the ends of the outer lead 25 are also welded to the metal foil 24 and extended to the outside. ing. Therefore, the outer leads 25 are closely spaced and extend in the same direction.

Although such a circle heater is attached to an electric cooking stove for lighting, the filament coil 21 in the bulb 1 has a circular shape without a break when viewed from above, so that the filament coil 21 has a circular shape. It glows red. Therefore, the appearance is favorable and the temperature distribution is improved. In addition, since the outer leads 25 are closely spaced and extend in the same direction, wiring can be easily handled. In addition, when holding the pinch seal part 13, a vertical bending load is applied to the pinch seal part 13, but since the flat pinch seal part 13 is oriented vertically, it is strong against this bending load, and the pinch seal part 13 is strong. It is possible to prevent a defect such as a crack occurring at 13.

[0012]

[Effect of the device]

 As described above, in the circle heater of the present invention, when viewed from the top, the filament coil in the valve has a perfect circle without breaks, and a pair of external leads extending from the pinch seal portion are provided. Since the interval is narrow and they extend in the same direction, the filament coil that shines red becomes a perfect circle when turned on, and it has a good temperature distribution with good appearance, and it is a circle heater with easy wiring arrangement. can do. Further, since the pinch seal is performed from the side surface direction of the annular portion, when the pinch seal portion is held, the pinch seal portion is strong against bending load and is less likely to crack.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a conventional example.

FIG. 3 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 1 valve 11 annular part 12 connection part 13 pinch seal part 2 filament assembly 21 filament coil 22 ring anchor 23 internal lead 24 metal foil 25 external lead

Claims (1)

[Claims for utility model registration] [Claim 1] A valve includes an annular portion, a pair of pinch seal portions that extend in parallel to approach the outside of the annular portion, and the annular portion and the pinch seal portion. A circle heater comprising a pair of arc-shaped connecting portions to be connected, wherein the pair of connecting portions are crossed so as not to contact each other, and pinch-sealed from a side surface direction of the annular portion.