JPH0145107Y2 - - 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 an opening/closing member interposed between the two ends and a tightening device interposed between the other ends to form a substantially cylindrical shape.

[Effect]

A pair of semicircular arc-shaped heating elements formed by bending 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, FIG. 3 is a left side view, and FIG. 4 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 placed in an autoclave or the like as a heated body P.
A pair of semicircular arc-shaped heating elements 1, 1 are formed by inverting and bending 2a in a U-shape along the circumferential direction at a location approximately half the length of the outer circumference.

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

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 with a flexible electric wire 5 for electricity supply. Further, lead wires 6, 6 connected to a power source (not shown) are attached to the other terminals 4, 4, respectively.

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

A hinge 7 as an opening/closing member is provided on the terminal side of each heating element 1, and a tightening device 8 is provided on the U-shaped reverse bent portion 2a side. Each heating element 1 is coupled to form a substantially cylindrical shape.

On the terminal side, as shown in FIG. 3, fixing fittings 9 each having a semicircular fitting portion are fitted onto each heating element 1 from the outside, and these fixing fittings 9 are fixed to the hinge 7. As a result, the heating elements 1, 1 are held and fixed to each other.

Note that the fitting between each heating element 1 and the fixing fitting 9 is preferably slightly loose in consideration of thermal expansion of the heating element 1 itself and the object to be heated P.

On the side of the U-shaped inverted bent portion 2a of the heating elements 1, 1, in the same way as described above, a fixing metal fitting 10 having a semicircular fitting portion is fitted from the inside to the outside and welded. 10 is integrally fixed to the tightening bands 8a, 8b of the tightening device 8. 11
are tightening screws which can be removed from the tightening bands 8a, 8b.

As described above, the heating elements 1, 1 formed individually
are connected with a hinge 7 at one end, so that the heating elements 1, 1 can be rotated around the hinge 7 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, the existing heating device A for the heated object P
The installation and removal operations can now be carried out extremely easily, which is advantageous in maintenance of the heated object P, etc.

In addition, by providing the hinge 7 on the terminal side of the heating elements 1, 1, the terminals can be connected in advance with the flexible electric wire 5 during the manufacturing and assembly process of the heating device A or before attaching it to the heated object P. This improves work efficiency.

After attaching the heating device A to the object to be heated P, tighten the tightening screw 11, and the heating elements 1, 1 will be attached to the object to be heated P.
The material is in close contact with the outer periphery of the material, and effective heating is performed.

Even if tension is applied to the heating elements 1, 1 due to the thermal expansion of the heated body P, this is absorbed by the elastic action of the heating device A as a whole, so that the heating element 1 may be damaged or the internal heating wires may be damaged. There is no risk of causing any abnormality.

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, as shown in the developed view of FIG.
It is also possible to meander a plurality of times in the circumferential direction to form a heating element of an appropriate size depending on the heating area of the object to be heated.

Although the hinge 7 is used as a means for connecting the heating elements on the terminal side, other connecting 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, a tubular body containing a heating wire is bent into a pair of semicircular arc-shaped heating elements, and both ends of the tube are connected by an opening/closing member and a tightening device, and the tube body is opened/closed. Since each terminal on the member side is connected with a flexible wire, it is possible to expand the heating element in the diametrical direction with the flexible wire connected, and therefore it is possible to attach and detach the heating element to and from the heated object. This greatly improves workability and work efficiency.

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 cross-sectional plan view taken along the - line in Fig. 1, Fig. 3 is a left side view, and Fig. 4 shows a tube body. FIG. 5, which is a partially cutaway plan view, is a developed view of a heating element showing another embodiment of the present invention. A... Heating device, P... Heated object, 1... Heating element, 2... Tube body, 2a... Inverted bending part, 3, 4...
...Terminal, 5...Flexible electric wire, 6...Lead wire, 7
...Hinge, 8...Tightening device, 9, 10...Fixing metal fittings, 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,
An opening/closing member in which 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. and a tightening device interposed between the other ends to form a substantially cylindrical shape. (2) Connect one end of each heating element in a pair with a flexible electric wire, and connect the other end with a flexible wire.
The heating device according to claim (1) of the utility model registration, each of which is connected to a power source.