JPS60212988A - Sheathed heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heater that is widely used as a heating source for general home appliances, industrial electric furnaces, and the like.

BACKGROUND OF THE INVENTION Conventional Structures and Problems The oven heater has been widely used as a heating source for general cooking appliances such as toaster ovens, microwave ovens, rice cookers, and hot plates, and now as industrial electric furnaces.

This is because the heater is simple, has excellent electrical insulation, is safe, and has excellent corrosion resistance.

In general, a heater has a coiled heating wire with electrical outlet terminals at both ends inserted into the center of a metal pipe, and this metal pipe is filled with electrical insulating powder made of fused Magnenoa powder, and both ends of the metal pipe are connected to a It is sealed with a sealing material such as melting point glass and heat-resistant resin.

The heater with this type of structure has excellent electrical insulation between the metal pipe and the electrical outlet terminal, so this type of heater is used especially in products where safety is important (1).

As a metal pipe material, these heaters have an average linear expansion coefficient of 17o to 19o from room temperature to 500'C4.
×1o/℃ 5US304, 5US321 and N
CF 800 is used as the electrical outlet terminal, and the above 5US304 is used as the sealing material, and the average linear expansion coefficient from room temperature to working temperature is 110 to 13.
A low melting point glass with a value of 0x1 o/°C is used in each case.

However, with the above combination, the mechanical strength of the low-melting glass used as the sealing material and the electrical outlet terminal is weak, making it difficult to use the Z-Z heater in the manufacturing process of the Z-Z heater, especially in the process after glass sealing or as a product. 1. If a load is applied to the electrical outlet terminal during assembly, etc., the low melting point glass that is the sealing material may easily crack and the electrical insulation may be impaired. A stopping structure is desired.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned conventional drawbacks and provides a lens heater having a sealing structure with excellent mechanical strength.

Structure of the Invention The present invention uses heat-resistant steel with an average linear expansion coefficient of 140 to 16o x 10/℃ from room temperature to 500°C as a metal pipe, and uses heat-resistant steel with an average coefficient of linear expansion of 140 to 16o x 10/°C from room temperature to 500°C as an electrical lead-out terminal.
Heat-resistant steel with an average linear expansion coefficient of 100 to 130 x 10/℃ is used as a sealing material to seal the gap between the pipe and the electrical outlet terminal. It uses low melting point glass with a coefficient of 80 to 10 x 1o/℃, and has increased mechanical strength by matching the thermal expansion between the metal pipe, electrical outlet terminal, and low melting point glass. It is something.

DESCRIPTION OF EMBODIMENTS A specific embodiment of the present invention will be described with reference to FIGS. 1 and 2.

Example metal pipe 3 was 5US321. having the chemical composition and average coefficient of linear expansion shown in Table 1. NGFBOO (trade name Incoloy 800) or NCF 600 (trade name Inconel 600) is used as the electrical outlet terminal 1, which is either auslanitic stainless steel or ferritic stainless steel having the chemical composition and average linear expansion coefficient shown in Table 1. Also, the first nichrome wire is used as the heating wire 2.
Each species was used.

As the trench suppressing material 6, a low melting point glass having an average coefficient of linear expansion from room temperature to working temperature in the range of 70 to 13o x 1o/°C was used.

By combining the above-mentioned materials as shown in Table 2, a heater heater shown in FIG. 1 having a diameter of 6.6 mm and a length of 500 mm was completed.

(Left below) In the sheathed heater, a coiled heating wire 2 to which an electricity extraction terminal 1 is connected is placed in the center of a metal pipe 3, and magneur powder 4 is filled between the metal pipe 3 and the heating wire 2.
After rolling and reducing diameter, annealing treatment is performed.

It was manufactured by sealing both ends of a metal pipe 3 with a sealing material 5 made of low melting point glass.

The sample numbers of the completed /-Z heaters were 1 to 42.

Sample numbers 1 to 4 are conventional 7
Sample numbers 6 to 16 are /-Z heaters in which a conventional 5US321 4 tab NCF300 is used as the metal pipe 3, and the electrical outlet terminal 1 and the sealing material 5 are changed.

On the other hand, sample numbers 16 to 42 use NCF600 with a linear expansion coefficient of 142 × 10 / ° C as the metal pipe 3,
This is a sheathed heater in which the electrical outlet terminal 1 and the sealing material 6 are changed.

In this way, in order to check the mechanical strength of the sealing groove end of the completed sheathed heater, as shown in Fig. 2, a load was applied to l = 1 ozm from the tip of the metal pipe 3, and then the water pressure tank was The sealing material 6 was placed into
The cracking of the low melting point glass used as a glass was investigated.

At this time, the sheathed heater that showed 2000MΩ or more was marked as a good product and marked with an ○, and the /-Z heater that showed 2000MΩ or less was marked as a defective product and marked with an ×.
It was shown on the clothes.

Furthermore, the load was between F = okg and F = 9 kg... Taste (hereinafter referred to as Kinpaku) As is clear from the second coating, the conventional rice heaters of sample numbers 1 to 4 were only slightly heated. At -3 kg, the low melting point glass cracked and the electrical insulation deteriorated.

On the other hand, as the metal vibrator 3, the conventional SUS 321
Sample numbers 5 to 16, 7-
Some Zuhita can withstand F=6 at 9i, but some have cracks at 9i at %F-◯, that is, cracks occur at a stage after sealing.

1, the coefficient of linear expansion as metal vibrator 3 is 142 x 10/
Sample No. 16 using NCF600 with a temperature of 170 to 190〈io-'/℃ and 5US304, 5US321, 5tlS316L with a linear expansion coefficient of 170 to 190〈io-'/℃ as an electrical outlet terminal. 17. 18,19°20+
2L 22, 23. Furthermore, as an electrical outlet terminal, 5US40 with a linear expansion coefficient of 100 to 130 x 10/℃ is used.
5,5US410L, 5US430゜5US430LX
, 5US444, 5US436L, SUM409, and the linear expansion coefficient of the low melting point glass is 80 x 10-7/℃
Sample number 27 using the following or 100×162/℃ or higher. 28. 31, 32, 33, 36, 37
．． In each of the 40 7-Z heaters, cracks occurred after sealing.

However, as the metal pipe 3, the coefficient of linear expansion is 142×16
NCF 600 with a linear expansion coefficient of 100 to 130
℃ 5US405, 5US410L, 5US430
．． 5US430LX, 5US444, 5US436L.

5UH409 has a linear expansion coefficient of 80 to 1o○X
Sample No. 24 in which low melting point glass having a temperature of 1 o/°C was used as the restraining material 5. 25. 26.29. 30°34H3
5+ 381 391 411 42 of the present invention exhibited excellent electrical insulation properties without cracking even under a load of F=9 kg.

In this way, the linear expansion coefficient of the metal vibrator 3 is 140~
Electrical extraction terminal 1 is made of heat-resistant steel with a temperature of 16o
Heat-resistant steel with a linear expansion coefficient of 100 to 130 x 1o-'/°C is used as the sealing material 5, and 80 to 1o x 1o as the sealing material 5.
By using a low melting point glass having a coefficient of linear expansion of .degree. C., it was possible to obtain a lens heater having a sealed structure with excellent mechanical strength.

In addition, in the embodiment of the present invention, as the metal vibrator 3, N
Although CF 600 was used, the material is not particularly limited to keratin, and any heat-resistant steel having an average coefficient of linear expansion from room temperature to 500'C of 140 to 16o x 10/C may be used.

It is presumed that this is because, in the present invention, by combining the linear expansion coefficients of the metal vibrator 3, the electrical outlet terminal 1, and the sealing material 5 as described above, the adhesion between the three is significantly improved.

Effects of the Invention As is clear from the above explanation, according to the heater of the present invention, heat-resistant steel having an average coefficient of linear expansion from room temperature to 500°C from room temperature to 500°C is 140 to 160×7 1o/°C is used as the metal pipe. , the average coefficient of linear expansion from room temperature to 600°C is 100 to 13 as an electrical outlet terminal.
Heat-resistant steel with a temperature of 0 x 10/℃ is used as a sealing material to seal the gap between the metal pipe and the electrical outlet terminal, and the average linear expansion coefficient from room temperature to working temperature is 80 to 1 o○ x 1.
By using each glass having a low melting point of 0/°C, a lens heater having a sealing structure with excellent mechanical strength can be obtained, and its practical value is great.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a /-z heater according to an embodiment of the present invention, and FIG. 2 is a front view of the main parts of the same embodiment showing a state in which a load is applied. 1... Electrical outlet terminal, 3... Metal pipe. 5... Sealing material. Name of agent: Patent attorney Toshio Nakao and 1 other person 1 image

Claims (1)

[Claims] The metal pipe is made of heat-resistant steel whose average linear expansion coefficient from room temperature to 500'C is 140 to 16o x 10/℃, and the electrical outlet terminal is made of heat-resistant steel whose average linear expansion coefficient from room temperature to 500'C is 100 to 130 x 1o. A low melting point glass having an average coefficient of linear expansion from room temperature to working temperature of 80 to 1ooX10/°C is used as a sealing material to seal the gap between the metal pipe and the electrical outlet terminal by using heat-resistant steel of /'c. A heater that uses