JPH0145108Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention can be applied to a large cylindrical autoclave used for heating and curing artificial quartz products, concrete products, cement products, etc. The present invention relates to a heating device for heating.

[Conventional technology]

In general, artificial quartz products, concrete products, cement products, etc. are manufactured in cylindrical autoclaves kept at a constant temperature and pressure in order to ensure quality and performance during the final process of manufacturing products after going through a specified manufacturing process. It is placed in a container and cured for a certain period of time.

Traditionally, autoclaves were heated using a band heater made of insulated mica with heating wire wound in a coil.
This was done by wrapping it around the outer circumference of the autoclave via a tightening band.

[Problem that the invention attempts to solve]

However, in the conventional heating device using a band heater, since the tightening band is separate from the heater, it is complicated to attach and detach from the autoclave, resulting in poor workability and efficiency.

In addition, band heaters that use mica as an insulator have a heat resistance limit of 300°C, and when used in autoclaves for artificial quartz products, they require high-temperature heating of over 400°C, so overheating can cause heat-generating wires. There is also the problem of disconnection.

The present invention has been made in order to solve the above-mentioned problems, and aims to provide a heating device that has excellent attachability to and detachment from a heated object and is suitable for high-temperature heating.

[Means for solving problems]

A means for solving the above problems is a heating device that is fitted onto a cylindrical heated object and heats it, which has a built-in heating wire and a terminal for electrical connection at one end. By curving the pair of tubes along the circumferential direction of the object to be heated, a pair of semicircular arc-shaped heating elements are formed, and the pair of heating elements is placed between one end of the terminal side. It is characterized in that it is connected by a tightening device interposed between the two ends and an opening/closing member interposed between the other ends to form a substantially cylindrical shape.

[Effect]

A pair of semicircular arc-shaped heating elements formed by curving the tubular body can rotate in the direction of diameter expansion around an opening/closing member interposed between one end of the heating element. It becomes easy to attach and detach from the body.

In addition, after installation, each heating element and the heated body can be brought into close contact with each other by the tightening device interposed between the other ends of the semicircular arc-shaped heating elements.
The object to be heated can be heated to a high temperature, and the heating effect can be enhanced.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a front view of the heating device of the present invention, FIG. 2 is a cross-sectional plan view taken along the line - in FIG. 1, and FIG. 3 is a plan view.

The heating element 1 of the heating device A is made of a flexible tube made of stainless steel or the like with excellent heat resistance and insulating a heat generating wire such as a nichrome wire with an insulator such as magnesium oxide (Mgo) having good thermal conductivity. It consists of a known sheathed heater covered with a body 2.

This tube body 2 is bent in a U-shape along the circumferential direction at a point approximately half the length of the outer circumference of an object to be heated (not shown) such as an autoclave, thereby forming a pair of halves. Arc-shaped heating elements 1, 1 are formed.

In addition, inverted bent portions 2a, 2a in each heating element 1
are bent so as to face each other at a predetermined distance in the circumferential direction at one end portion extending approximately half the circumference of the heated body.

Both ends of each heating element 1 are bent in the centrifugal direction, and terminals 3 and 4 are attached.

Corresponding terminals 3, 3 of each heating element 1 are connected to each other by a flexible electrical wire 5 for electricity supply, which has some extra length. Also, other terminals 4, 4
Lead wires 6, 6 each connected to a power source (not shown) are attached to the.

Thereby, both heating elements 1, 1 are electrically connected in series.

A tightening device 7 is provided on the terminal side of each heating element 1.
Further, hinges 8 as opening/closing members are provided on the U-shaped inverted bent portion 2a side, and each heating element 1 is connected to form a substantially cylindrical shape by these tightening devices 7 and hinges 8. .

On the side of the U-shaped inverted bent portion 2a, each heating element 1
As shown in FIG. 2, fixing fittings 9 each having a semicircular fitting portion are fitted from the outside, and by fixing these fixing fittings 9 to the hinge 8, the heating elements 1, 1 are connected to each other. The retention is fixed.

Note that the fitting between each heating element 1 and the fixing fitting 9 is determined by taking into account the thermal expansion of the heating element 1 itself and the object to be heated.
It is best to leave it a little loose.

On the terminal sides of the heating elements 1, 1, fixing fittings 10 having semicircular fitting portions are fitted from the outside and welded, in the same way as described above.
are integrally fixed to the tightening bands 7a, 7b of the tightening device 7. Numeral 11 is a tightening screw which can be removed from the tightening bands 7a and 7b.

As described above, the heating elements 1, 1 formed individually
are connected with a hinge 8 at one end, so that the heating elements 1, 1 can be rotated around the hinge 8 by removing the tightening screw 11, as shown by the two-dot chain line in FIG. , can be freely rotated in the radial direction.

Therefore, for existing heated objects that cannot be attached or detached from the axial direction (longitudinal direction), it is possible to easily attach or detach them from the radial direction by removing one end of the flexible electric wire 5 for energization from the terminals 3, 3. This is advantageous in maintenance of heated objects, etc.

If it is possible to attach and detach the heated body from the axial direction, the flexible electric wire 5 can be attached and detached by simply loosening the tightening device 7.
Needless to say, it is possible to easily install and remove the parts while the parts are connected.

After the heating device A is attached to the object to be heated (not shown), when the tightening screw 11 is tightened, the heating elements 1, 1 are brought into close contact with the outer periphery of the object to be heated, and effective heating is performed.

Even if tension is applied to the heating elements 1, 1 due to thermal expansion of the heated object, this is absorbed by the elastic action of the heating device A as a whole, so there is no chance of damage to the heating element 1 or damage to the internal heating wires. There is no risk of anything abnormal happening.

Further, if necessary, the heating element 1 can be surrounded by a heat insulating material to further enhance the heating effect.

It should be noted that the present invention is not limited to the above-described embodiments, and may be modified and implemented in various ways without departing from the spirit of the invention.

For example, it is also possible to form a heating element of an appropriate size according to the heating area of the heated object by making the tubular body 2 meander a plurality of times in the circumferential direction, or by not making it meander at all.

Although the hinge 8 is used as a means for connecting the heating elements on the side of the U-shaped inverted bending portion, other opening/closing members may be used as long as they have flexibility and heat resistance.

The tightening device may also be an elastic member such as a tension coil spring.

[Effect of idea]

According to the heating device of the present invention, the tubular body containing the heating wire is bent into a pair of semicircular arc-shaped heating elements, and both ends thereof are connected by the opening/closing member and the tightening device. It becomes possible to expand the heating element in the diametrical direction, and therefore the ease of attaching and detaching it to the heated body is greatly improved, and workability and work efficiency can be improved.

Additionally, it has superior heat resistance compared to conventional band heaters, and can heat objects to be heated at high temperatures.

Since the heating element can be brought into close contact with the object to be heated, it is possible to provide a device with excellent thermal efficiency.

[Brief explanation of the drawing]

Fig. 1 is a front view of a heating device showing an embodiment of the present invention, Fig. 2 is a plan view taken along the - line in Fig. 1, and Fig. 3 is a plan view showing a partially broken pipe body. It is. A... Heating device, 1... Heating element, 2... Tube body,
2a... Reverse bending part, 3, 4... Terminal, 5... Flexible electric wire, 6... Lead wire, 7... Tightening device, 8
...Hinge, 9, 10...Fixing bracket, 11...Tightening screw.

Claims (1)

[Claims for Utility Model Registration] (1) A heating device that is fitted onto a cylindrical heated object and heats it, which has a built-in heating wire and has a terminal for electrical connection at one end. A pair of tubes,
A pair of semicircular arc-shaped heating elements are formed by curving the object to be heated along the circumferential direction, and the pair of heating elements are interposed between one end of the terminal side. What is claimed is: 1. A heating device characterized in that the heating device is connected to the device by an opening/closing member interposed between the other ends to form a substantially cylindrical shape. (2) The heating device according to claim (1) of the utility model registration, wherein the tube body is reversely bent an appropriate number of times in the outward and outward directions along the circumferential direction of the heated object.