JP2003234166A - Vertical type tube heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vertical type tube heater that is safe and is excellent in durability, in which deformation of a heating element can be prevented and danger of a short circuit by breakage of an insulation spacer and contact of the heating elements each other or the heating element and a metal tube is eliminated. <P>SOLUTION: The vertical type tube heater stores the heating element 2 and two or more insulation spacers 3, in which the heating element 2 is inserted through, into the tube 1 that has a bottom. And it has a clip which has connected the end parts of two or more U-shape resistor 2a, which constitutes a heating element 2, mutually, and two or more hanging sticks 11 fixed to each the clips. These sticks 11 have been fixed to a lid 8 with terminals 7, which have been connected to the both ends of the heating element 2, respectively. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical tube heater in which a heating element is housed in a tube and is vertically suspended in a heating furnace for use.

[0002]

2. Description of the Related Art A tube heater has a basic structure in which a heating element and an insulating spacer for preventing a short circuit are housed and supported in a metal tube, and the heat of the heating element that is heated by energization is passed through the tube. It radiates heat into the furnace.

More specifically, as shown in FIG. 1, in general, a tube heater has a plurality of U-shaped resistors 2a having heating elements 2 connected to each other at their end portions and a plurality of heating elements 2 inserted therethrough. The insulating spacer 3 is housed inside the bottomed tube 1. Both ends of the heating element 2 are extended, and the terminals 7 connected to the respective extension portions are fixed by penetrating the lid 8.

A mounting flange 4 is provided on the opening edge of the tube 1.
Is provided, and after the lid body 8 in which the heating element 2 and the insulating spacer 3 are assembled and held as described above is housed in the tube 1,
A tube heater is assembled by sandwiching a packing between the lid body 8 and the mounting flange 4 and bolting.
Further, the tube heater is fixed to the furnace wall 5 by the mounting flange 4. A heat-resistant material 9 is filled between the lid 8 and the insulating spacer 3 adjacent to the lid 8 in order to prevent heat from escaping to the outside.

In such a tube heater, since the heating element is housed in the tube, the tube heater does not come into direct contact with the atmosphere in the furnace, and therefore the heating characteristics can be kept constant.
It is also suitable for heating the object to be processed in various atmospheres such as hydrogen.

[0006]

The tube heater described above includes a vertical type which is vertically suspended in a furnace and is used.
There is a horizontal type installed horizontally. In the vertical tube heater, there is a problem that the heating element is easily deformed due to the weight of the heating element itself and the weight of the insulating spacer inserted in the heating element.

That is, an ordinary heating element used in a conventional tube heater is a plurality of U-shaped resistors 2a having their end portions connected to each other by a connecting plate 10, as shown in FIG. is there. The free ends of the U-shaped resistors 2a at both ends of the heating element 2 are extended and further extended to the terminal 7
And is fixed to the lid body 8 (see FIG. 1). Also,
A plurality of insulating spacers 3 are inserted into the heating element 2, and each insulating spacer 3 is mounted on the insulating spacer 3 adjacent to the lower side with its central portion extending downward, and the insulating spacer 3a at the lowermost end is The lower end of each U-shaped resistor 2a is supported by the U-shaped portion.

Therefore, since the weight of the heating element 2 and the weight of the plurality of insulating spacers 3 are supported by the two terminals 7, the lower ends U of the U-shaped resistors 2a at both ends connected to the terminal 7 are supported. The letter part was the easiest to deform.
It is also known that the weight of a plurality of insulating spacers 3 is supported by bringing the lowermost insulating spacer 3a into contact with the inner bottom of the tube 1, but even in that case, the deformation of the heating element 2 is completely eliminated. It was impossible.

When the heating element of the tube heater is deformed,
If the insulating spacer inserted in the heater is damaged or the deformation is increased, the U-shaped resistors of the heating element or the U-shaped resistor and the metal tube may come into contact with each other, which may cause a short circuit.

The present invention has been made in view of such conventional circumstances.
Deformation of the heating element can be prevented, and there is no danger of damage to the insulating spacer or short circuit due to contact between U-shaped resistors of the heating element or between the U-shaped resistor and a metal tube.
The objective is to provide a vertical tube heater that is safe and has excellent durability.

[0011]

In order to achieve the above object, a vertical tube heater provided by the present invention includes a heating element in which ends of a plurality of U-shaped resistors are connected to each other, and a heating element. A plurality of inserted insulating spacers, a heating element and an insulating spacer are housed inside, a bottomed tube with a mounting flange at the opening edge, terminals connected to both ends of the heating element, and the terminal penetrates. A vertical tube heater including a lid body that is fixed and that is fixed to a mounting flange of a tube, wherein a connecting plate that connects the ends of the plurality of U-shaped resistors to each other, and It is provided with a fixed hanging rod, and each hanging rod is fixed to the lid body.

In the above vertical tube heater of the present invention, a receiving spacer is provided at the inner bottom of the tube, and each of the insulating spacers is always placed on the adjacent insulating spacer on the lower side and always It is characterized in that the insulating spacer at the lowermost end is placed in contact with the receiving spacer.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION In the vertical tube heater of the present invention, the ends of a plurality of U-shaped resistors forming a heating element are connected to each other by connecting plates, and a hanging rod is attached to each connecting plate. Attach and fix the suspension rod to the lid.

More specifically, in the heating element according to the present invention, as shown in FIG. 3, adjacent ends of a plurality of U-shaped resistors 2a are connected to each other by a connecting plate 10, and these are connected. After fixing the hanging rod 11 to the plate 10, each hanging rod 11
And a plurality of them are collectively fixed to the lid. The free ends of the U-shaped resistors 2a at both ends are connected to the terminal 7 and fixed to the lid, as in the conventional case.

As a result, the weight of the heating element and the plurality of insulating spacers is supported not only by the terminal but also by the plurality of suspension rods, so that the stress applied to the heating element is dispersed and deformation of the heating element is prevented. You can

Regarding the plurality of insulating spacers,
Generally, since each insulating spacer is always placed on the adjacent insulating spacer on the lower side, the weight of all the insulating spacers is applied to the heating element through the insulating spacer at the lowermost end, which promotes the deformation of the heating element. is doing. Therefore, in a preferred embodiment, if a receiving spacer is installed on the inner bottom of the tube and the lowermost insulating spacer is placed in contact with the receiving spacer, the weight of the plurality of insulating spacers is reduced to the inside of the tube. It can be received at the bottom and the stress on the heating element can be further reduced.

[0017]

EXAMPLE A specific example of the tube heater of the present invention is shown in FIG.
Shown in. This tube heater includes a heating element 2, a plurality of insulating spacers 3 through which the heating element 2 is inserted, and a receiving spacer 1 installed at the bottom of the tube 1 and through which the heating element 2 is inserted.
2 and are housed inside a bottomed tube 1 made of stainless steel.

As shown in FIG. 3, this heating element 2 has a connecting plate 10 in which adjacent ends of a plurality of U-shaped resistors 2a are connected to each other.
Are connected to each other, and each connecting plate 10 has a hanging rod 11
Is fixed. The free ends of the U-shaped resistors 2 a at both ends are connected to the terminal 7, respectively.
The plurality of suspension bars 11 and the terminals 7 are fixed by penetrating the lid body 8.

At the inner bottom of the tube 1, a bottomed cylindrical receiving spacer 12 is installed with its open end facing down.
The U-shaped resistor 2a is inserted into each of a plurality of through holes provided at the upper end of the bottomed side. Further, the protruding lower end portion of the lowermost insulating spacer 3a is always abutted on the receiving spacer 12.

A lid body 8 in which the heating element 2, the receiving spacer 12 and a plurality of insulating spacers 3 are assembled and held is housed in a tube 1, and the lid body 8 is packed in a mounting flange 4 provided at an opening edge of the tube 1. It is bolted across. The tube heater thus configured is fixed to the furnace wall by the mounting flange 4. A heat-resistant material 9 is filled between the lid 8 and the uppermost insulating spacer 3b to prevent heat from escaping to the outside.

In this embodiment, a hanging rod for fixing the heating element 2 to the lid 8 via the connecting rod 10 is shown in FIG.
Although the number of hanging rods 11 is illustrated, the number of hanging rods 11 varies depending on the number of U-shaped resistors 2a forming the heating element 2 and the like, and the fixing position of the hanging rod 11 to the lid 8 is also the heating element 2. It can be changed according to the arrangement of the.

[0022]

According to the present invention, the stress applied to the heating element can be dispersed to prevent the heating element from being deformed. Therefore, the insulating spacer is damaged, and the U-shaped resistors of the heating element or U of the heating element are prevented. It is possible to provide a vertical tube heater that is safe and has excellent durability without the risk of a short circuit due to the contact between the V-shaped resistor and the metal tube.

[Brief description of drawings]

FIG. 1 is a conventional vertical tube heater, (a) is a schematic partially cutaway side view thereof, and (b) is a plan view thereof.

FIG. 2 is a schematic side view showing a main part of a conventional heating element.

FIG. 3 is a schematic side view showing a main part of a heating element of the present invention.

FIG. 4 is a specific example of a vertical tube heater according to the present invention, in which (a) is a schematic partially cutaway side view thereof, and (b) is a plan view thereof.

[Explanation of symbols]

1 tube 2 heating element 3 Insulation spacer 7 terminals 8 lid 10 connecting rod 11 hanging rod 12 Receiving spacer

Continued front page    F-term (reference) 3K092 PP09 QA02 QB02 QC02 RA02                       RD03 TT13 TT14 VV06 VV26                       VV32

Claims (2)

[Claims] 1. A heating element in which end portions of a plurality of U-shaped resistors are connected to each other, a plurality of insulating spacers through which the heating element is inserted, a heating element and an insulating spacer are housed inside, and an opening edge is formed. A vertical tube heater having a bottomed tube having a mounting flange on each of the terminals, terminals connected to both ends of the heating element, and a lid body fixed through the terminals and fixed to the mounting flange of the tube. And a connecting plate that connects the ends of the plurality of U-shaped resistors to each other, and a suspending rod fixed to each connecting plate, and each suspending rod is fixed to the lid body. Vertical tube heater. 2. An inner bottom portion of the tube is provided with a receiving spacer, each of the insulating spacers is always placed on an insulating spacer adjacent to the lower side, and the insulating spacer at the lowest end is always placed on the receiving spacer. The vertical tube heater according to claim 1, wherein the vertical tube heater is mounted in contact.