JP3420379B2 - Non-contact wire heating device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for heating a linear, rod-shaped or thread-shaped filament material made of metal material, glass material, synthetic resin material or synthetic fiber in a non-contact state. Regarding

[0002]

2. Description of the Related Art In the Japanese Patent Publication No. 4-66936, the applicant of the present application arranges an elongated strip-shaped or circular tube-shaped conductive ceramic molded body along a passing thread-shaped passage and causes the conductive ceramic to generate heat by energization. The heat setting device by the pipe-shaped heater which heats the passing thread material in a non-contact state was disclosed.

This heating device can efficiently perform heat treatment without deteriorating the surface condition of the wire material to be heated, as compared with a conventional heating device or a device for heating the heating plate in contact with it. In addition, a U-shaped groove is formed in the sheath heater body disclosed in Japanese Patent Publication No. 2-60769.
Set the arrow blade type guide with slit in this groove,
Compared with the conventional non-contact heating device in which the yarn runs on the bottom of the slit, the direct heating method has good thermal efficiency and is advantageous in terms of energy saving. It is particularly excellent in that it has no fear.

[0004]

The problem to be solved by the present invention is to make full use of the advantages of the non-contact heating device using a tubular heating element having such excellent characteristics.
The use condition is improved so that the structure of the apparatus can be set to an optimum state according to the heating condition of the filamentous material, and the utilization thereof is expanded.

A first specific object of the present invention is to complete temperature control means for reducing greatly different temperature differences between the inside and outside of a pipe in the case of a circular tubular heating element.

A second object is to achieve uniform heating temperature in the longitudinal direction when the heating portion of the tubular resistance heating element is lengthened.

A third object is to extend the life of the heating element itself.

Still another object is to prevent the resistance value from changing due to stain coating on the inner diameter of the self-heating heater and to establish means for maintaining the heating atmosphere.

[0009]

The present invention relates to a material to be heated.
The wire that runs in a non-contact state over the entire length.
Formed inside and metalized terminals on both ends
Non-contact type filament heating equipment consisting of tubular resistance heating element made
Temperature detection for temperature control in the heat generating part
The device is attached in contact with a tubular resistance heating element,
Accurate control for temperature control
Is.

By surrounding the tubular resistance heating element with a heat insulating heat insulating material, the heat insulating property against heat is enhanced and the energy consumption is minimized.

Further, tubular guides made of a heat-resistant and abrasion-resistant insulating material for introducing the heated filaments are connected to both ends of the tubular resistance heating element having the metallized terminals, and the guides are connected to the inside of the heating pipeline. The wire material can be smoothly introduced, the damage to the heating tube and the end can be reduced, and the metallized terminal part and the tubular guide part can be exposed to the outside of the heat insulating heat insulating material to allow air cooling. By this, deterioration of the metallized portion can be prevented.

Further, a plurality of tubular resistance heating elements are arranged in the longitudinal direction.
It is possible to provide a linear long heating device having a structure in which the connecting portion is connected by a joint made of an insulating material. For example, the amount of bending (warp tolerance) of a commercially available Al ₂ O ₃ -based combustion tube, protection tube, etc. is within a warp tolerance of 3 to 5% with respect to the length. The tolerance of the system pipe is an unavoidable phenomenon in the manufacturing method. For example, assuming a tolerance of 3% in the case of a tubular resistance heating element with a length of 1 m, there is a warp of 3 mm. As a result, the object to be heated cannot go straight due to the slackening phenomenon, etc. and comes into contact with and slides inside the heater, so that a good product cannot be obtained. Therefore, by assembling three heaters each having a length of 330 mm and a warp tolerance of 3% in series via an insulating guide, the sled having a total length of 1 m can be reduced to about 1/3 of about 1 mm.

[0013] By mounting at least one temperature sensor to the heating tube portion of each was this connection, each
The temperature of each heat generating tube can be controlled individually, and the temperature over the entire length of the heating device can be managed more accurately.

In the non-contact type heating device of the present invention, an inlet port for introducing a gas body for controlling the atmosphere into the heating tube is formed near one terminal of the tubular resistance heating element or in the tubular guide. An atmosphere suitable for heating the heating filament material can be provided.

Further, a heat-resistant and insulating ceramic protection tube is inserted inside the tubular resistance heating element to prevent the resistance value from changing due to contamination of the resistance heating element and also serve as a tubular guide. You can

The resistance heating element has a specific resistance value in the range of 1.0 × 10 ⁻³ Ω · cm to 9 × 10 ³ Ω · cm, more preferably 1.0 × 10 ⁻² Ω · cm. cm to 9x
It is preferable to adjust it within the range of 10 ² Ω · cm. If the specific resistance value is less than 1.0 × 10 ⁻³ Ω · cm, the wall thickness may be 0.5 mm or less due to the relationship between the diameter and the length of the tubular resistance heating element. Is difficult, or even if the applied voltage is a low voltage of about 10V, 2
Since a current value of 0 ampere or more may flow, there arises a problem that the capacitance of the lead wire needs to be increased.

Further, in the heating device of the present invention, a ceramic material or an electrically conductive ceramic material which emits at least one of near infrared rays and far infrared rays is used as the tubular heating element or tubular resistance heating element. Instead of the ceramic material or the conductive ceramic material, it is possible to use a tubular heating body in which a coating for generating at least far infrared rays among infrared rays is formed on the inner surface of the metal pipe.

Furthermore, one linear slit penetrating from the outer diameter to the inner diameter surface may be formed in the longitudinal direction of the tubular resistance heating element, and the wire material to be heated may be inserted from the side surface of the resistance heating element. it can.

As the conductive ceramic material, a conductive oxide-based or non-oxide-based ceramic material, or an insulating ceramic and a carbide of group IVa, Va or VIa,
Nitride, boride or carbonitride, carbon boride, carbonitride or carbonitride and compounds in which these substances contain oxygen,
Further, a composite material in which a metal silicide such as MoSi ₂ or a conductive component such as a metal material is combined is used.
Furthermore, a silicon carbide type resistance heating element can be preferably used.
INDUSTRIAL APPLICABILITY The heating device of the present invention incorporating a tubular heating element or heating element that generates at least far infrared rays among infrared rays or infrared rays can be applied to many kinds of filament materials, and in particular, synthetic resins, synthetic fibers and natural fibers. Alternatively, for woven fabrics and other high molecular compound materials, these objects to be heated absorb the far infrared rays and self-heat, and as a result, they can be heat-treated in a lower temperature range than the conventional equipment, which not only saves energy. A textile product with a good texture can be obtained.

The coefficient of thermal expansion of the resistance heating material is 9.
5 × 10 ^-6 / ℃ or less, it is better to be as small as possible,
Since the temperature of the furnace case may be heated up to about 50 ° C, taking into account the thermal expansion margin of the entire device, a heating tube with a resistance heating element or a ceramic tube attached,
Appropriate materials should be selected or adjusted so that excessive tensile stress and compressive stress are not applied.

[0021]

A temperature control sensor for a heating tube in a non-contact type heating device comprising such a pipe-shaped resistance heating element or a heating tube in which an insulating ceramic tube is attached to the inner diameter of the resistance heating element Practical application of the non-contact heating device for the filament can be achieved by mounting, introducing guide of the filament to be heated, continuous connection, introducing atmospheric gas and establishing heater deterioration preventing means.

[0022]

【Example】

Example 1 FIG. 1 shows a first example of the non-contact heating device according to the present invention.

In the figure, reference numeral 1 denotes a resistance value of 9 × 10 ^{−3 to} 9 × 10 ³ ohms arranged in the heater case 2.
1 shows a tubular heating element made of cm of resistor material. The inner surface of the tubular heating element 1 exposes the resistance heating element itself to form a passage for the heated filament. Reference numeral 3 denotes a heat insulating material layer provided over the outer peripheral surface of the tubular heating element 1 over its entire length, whereby the heat retention and soaking state in the tubular heating element 1 can be maintained. Reference numeral 4 denotes a terminal portion made of a resistance heating element itself or a good conductor having a resistance value lower than that of the resistance heating portion. This terminal portion is formed by metallizing the outer peripheral surface of the end portion. The terminal portion is exposed to the outside of the heat insulating and heat insulating material 3 and the air cooling mechanism from the ventilation hole 5 provided in the heater case 2 prevents the temperature from rising. The layer is prevented from being deteriorated due to high temperature, and cracks and peeling phenomena due to a difference in coefficient of thermal expansion between the matrix and the metallized layer, which occur during heating and cooling, are prevented. When the heating device is used in a state where the metallized portion of the tubular resistance heating element 1 and the conductive wire are enclosed in the heat insulating and heat insulating material 3, the maximum temperature is 5
When the temperature is set to 00 ° C, the life is about 3 months to 12 months due to oxidation, cracks, peeling, etc., whereas the air-cooling mechanism does not change the metallized portion even when used for 3 years. It does not occur at all. Further, ceramic guides 6 are fitted and attached to the end faces of the metalized terminal portions 4 at both ends of the tubular heating element 1. The guide 6 is a material to be heated, which has a small inner diameter and is formed of a material having wear resistance, heat resistance, and heat insulation properties that improves the slipperiness by reducing the surface roughness of the inner surface. Even if the linear material vibrates or slightly loosens, the surface of the linear material does not have a flaw. The cylindrical fitting portion 61 to be inserted into the terminal portion 4 and the main body. 62 and a flange 63 for engaging with the outer surface of the heater case 2. 7
Indicates a temperature sensor mounting portion mounted in contact with the outer surface of the tubular heating element 1 in the substantially central portion thereof. The mounting position can be appropriately adjusted to an optimum position according to the temperature distribution inside the heating tube.

2 to 3 show a first mounting state of the temperature sensor mounting portion 7. FIG. 2 shows a state of the tubular heating body 1 as seen from the cross section, and FIG. 3 is a side view of this attachment state. In the figure, reference numeral 71 denotes a fitting for mounting the thermocouple protection tube 72, which has a saddle shape having a protrusion 73 at the top. The saddle-shaped fixture 71 is sandwiched and fixed around the tubular heating body 1. This saddle type mounting jig 71
In many cases, the jig itself is in surface contact with the outer surface of the heating material, and the area of the heat transfer contact area to the sensor is large, so that a more accurate surface temperature can be detected. Further, since the tip of the temperature sensor protection tube 72 is wound tightly with a ceramic cord having high heat resistance and good heat insulating and heat retaining properties, the inside is heated and maintained at substantially the outside temperature of the heater, so that a more accurate temperature can be detected.

FIG. 4 shows another mounting means of the temperature sensor mounting portion 7, in which a blind hole 74 or a through hole is provided in the tube wall of the tubular heating element or the heating tube 1, and a thermocouple protection tube 72 is provided therein. Wear directly. As a result, the sensor is built in the heating tube or the thick portion of the heating tube, and an intermediate temperature between the outer surface temperature and the inner temperature of the heating tube can be detected. In addition, when the tip of the sensor is inserted to the inner diameter surface in the hole formed by penetrating the wall thickness of the heating tube, a value substantially corresponding to the internal temperature of the heating tube can be detected.

Embodiment 2 FIG. 5 shows an embodiment in which an insulating protective tube 8 is inserted into the inner surface of the tubular resistance heating element 1 to form a heating tube. The insulating ceramic tube 8 is a thin-walled, for example, alumina-based insulating tube, and is inserted so that it can be replaced if necessary. The protection tube 8 made of this insulating ceramic projects from the heat insulating material partition plate 31 insulated from the heat insulating material 3 and the tubular heating element 1 beyond the metalized terminal portion 4 to the outside of the heater case 2 and is a tubular guide. Is also used. By inserting the insulating ceramic tube 8, it is possible to reduce deterioration and wear of the heating element due to contaminants generated on the inner surface of the tubular heating element 1 from the object to be processed. If this pollutant is, for example, an organic substance, it can be removed by burning by raising the set temperature of the heating device, but if it is an inorganic substance, it cannot be removed by burning and reacts with the resistance heating element, resulting in a heater resistance value. Will appear to be smaller. In such a case, the deterioration and wear of the heating element can be reduced by inserting the insulating ceramic tube 8.

Embodiment 3 FIG. 6 shows an embodiment in which a plurality of tubular resistance heating elements are connected to each other and the length of the heating portion is linearly formed to be about 500 to 2000 mm.

In the figure, the tubular resistance heating element 1 comprises a central heating main pipe portion 101 and two heating pipe portions 102 and 103 at both ends.
It is divided into more than one book. Each divided heating tube 10
Metallized terminal parts 4 on both ends of 1, 102, 103
Is formed, and the terminal portion 4 is connected via a connecting member 9. Each of the divided heating pipes is provided with the temperature sensor mounting portion 7 described in the first embodiment, whereby an arbitrary temperature gradient can be formed in the heating area of each heating pipe.

FIG. 7 is a view showing a connected state of each divided pipe. The connecting member 9 is made of an electrically insulating ceramic-based material, and has a connecting portion 91 having the same inner diameter as the diameter of the heating element or the heating pipe formed with the metallized terminal portion 4 or the end of the heating tube or the tubular guide. It is composed of an annular outer peripheral surface portion 92, and the connecting member 9 is mounted between the terminal portions 4 of the divided tubular resistance heating elements to connect the respective divided tubular resistance heating elements. Usually, the heating tube having the passage for the heated filament inside is made of a ceramic resistance heating element itself or an insulating ceramic tube inserted inside the resistance heating element. However, it is very difficult to form it straight, and the manufacturing cost becomes higher as the length becomes larger. Further, the temperature in the longitudinal direction of the tubular heating element manufactured by the one body is high in the vicinity of the center both inside and outside the pipe, and the heat loss is large at both ends of the heater, so that the temperature is low and a mountain-shaped temperature distribution is obtained. However, by using a split type heater in which two or more heaters are assembled in series, and by providing the position of the temperature sensor on each split pipe, the soaking zone is longer than in the case of a single heater. It can be a temperature distribution device.

Embodiment 4 In FIG. 8, water vapor, a gas for forming a surface layer, a non-oxidizing gas or a reducing gas for preventing surface oxidation, etc. are made to act on an object to be heated running in a heating pipe. 2 shows another embodiment of a heating device suitable for

In the figure, 10 and 11 are provided near the inlet 12 and the outlet 13 of the heated filament of the heating tube 1 inserted in the inner diameter of the resistance heating element or the heating element, and
1 shows a gas introduction pipe in which a metallized terminal portion 4 is formed near each end and a discharge pipe for discharging a part of the introduced gas. It is also possible to form the terminal portion by metallizing the portion of the discharge port 13 and not form the gas discharge port 11 for the introduced gas, and to form the gas discharge port in this terminal portion. The gas introducing pipe 10 is integrated with the tubular heating element 1 so that the crossing angle α is 90 ° or more, or is connected to the tubular heating element 1 by an appropriate connecting means so that the introduced gas can flow smoothly. ing. Most of the gas introduced from the introduction pipe 10 to the heating element 1 flows through the heating zone in the heating pipe 1 heated to a predetermined temperature in the direction of the arrow, and the heating atmosphere suitable for the heated wire material is provided. After being formed, it is discharged from the discharge pipe 11. Introductory pipe 1
A part of the gas introduced from 0 may flow toward the inlet of the heated filament material, and also in the device provided with the gas discharge pipe 11, a part of the introduced gas is discharged from the outlet. . Therefore, the tubular guide is installed in the inlet 12 and the outlet 1.
When it is attached to No. 3, the inner diameter should be as small as possible.

Embodiment 5 As shown in FIG. 8, in FIG. 9, a tubular resistance heating element 1 is replaced with a gas introduction tube 10 provided in a branching manner, and a tubular resistance heating element 1 is provided with an inlet 12 for a material to be heated. Formed metallized terminal 4
An example in which the gas introducing member 14 is fitted and provided is shown in FIG. In this case, the gas introducing member 14 is also formed as a guide, and is provided with an inlet 15 and a gas inlet 16 for the material to be heated.

As described above, by introducing water vapor and various gases into the heating pipe, various effects can be obtained when heating the object to be treated. For example, in the case of a fibrous material, when not only synthetic fibers but also filaments of animals and plants are heated inside the tubular resistance heating element, steam is supplied into the heating pipe to add a wetting action to the action of temperature alone, so that it is stretched. It is possible to improve the properties, false twisting properties, and the texture during compressed air processing.
In addition, when used for heat treatment of metal wires or the like, by introducing a non-oxidizing gas or a reducing gas, power consumption is low, and an excellent wire rod is obtained with an extremely small amount of gas consumption. be able to.

Regarding the power consumption of the heating apparatus of the present invention, in the structure shown in FIG. 1 of the embodiment, the resistance heating element has an inner diameter of 10 mm and a length of 500 mm, and the heat insulating material has a thickness of 70 mm.
When the temperature is kept at 500 ° C at 70W / H,
The result is very energy-saving.

[0035]

The following effects are exhibited by the non-contact type heating device of the present invention.

(1) Excellent energy saving performance with extremely low power consumption can be exhibited.

(2) The temperature is raised in a short time to reach an operable constant temperature.

(3) Further, it is possible to raise the temperature in the heating tube to the temperature control set temperature of the highest temperature portion in a short time.

(4) Since humidified air by steam or non-oxidizing gas can be introduced into the heating pipe, the non-contact type heating device can be used for various purposes.

(5) With the heating tubes connected in a straight line,
It can be a long device.

(6) Even if the workpiece is sent in a vibrating state, it is held by the small diameter portions of the guides at both ends, so that it does not come into contact with the inner wall of the heating tube.

(7) Therefore, it is possible to achieve multipurpose and practical application of the non-contact type heating device.

[Brief description of drawings]

FIG. 1 shows an embodiment of a heating device of the present invention.

FIG. 2 shows a first example of a mounted state of a temperature sensor.

FIG. 3 shows a state of the example of FIG. 2 viewed from the side.

FIG. 4 shows another example of a mounted state of the temperature sensor.

FIG. 5 shows another example in which a protective tube is inserted in the heating device of the present invention.

FIG. 6 shows an example in which two or more tubular resistance heating elements are connected .

FIG. 7 shows a connection state of divided pipes.

FIG. 8 shows an example of a heating device according to the present invention capable of introducing atmospheric gas.

FIG. 9 shows an example in which an atmosphere gas inlet is provided together with an inlet for an object to be heated.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiro Okezaku, 80 Hanasaka-cho, Hamasaka-cho, Komatsu City, Ishikawa Prefecture Hokuriku Molding Industry Co., Ltd. (56) Reference JP-A-52-55718 (JP, A) JP-A-6 -272124 (JP, A) JP-A-55-16936 (JP, A) JP-A-4-308240 (JP, A) Actual development Shou-51-43700 (JP, U) JP-B-52-41370 (JP, B1) ) Japanese Patent Publication 4-66936 (JP, B2) S. 59-18319 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) D02J 1/00-13/00 D02G 1 / 00-3/48 F26B 13/10

Claims (8)

(57) [Claims] 1. A specific resistance value is 1.0 × 1 in which a passage through which a wire material, which is a material to be heated, runs in a non-contact state over the entire length is formed, and metallized terminal portions are provided at both ends thereof.
0 ^{-3 Ω · cm 9 × 10 3} Ω · cm ceramic material
It has a tubular resistance heating element consisting of a material, and for the temperature control in the heating part of this tubular resistance heating element
The temperature detection device of the
Te, contactless interface member heating apparatus is characterized in that mounted in contact. 2. A linear resistance material, which is a material to be heated, has a passage inside which runs in a non-contact state over the entire length, and metalized terminal portions are provided at both ends thereof, and the specific resistance value is 1.0 × 1.
0 ^{-3 Ω · cm 9 × 10 3} Ω · cm ceramic material
It has a tubular resistance heating element consisting of a material, and for the temperature control in the heating part of this tubular resistance heating element
The temperature detection device of the
A through hole is provided and a thermocouple protection tube can be directly attached to this.
Therefore, a non-contact type filament heating device characterized by being attached in a contact state. 3. A tubular resistance heating element is provided with a heat insulating and heat insulating material.
Surrounded by the surroundings, as described in claim 1 or claim 2.
Non-contact type filament heating device . 4. A heat-resistant insulation layer is formed on the inner surface of the tubular resistance heating element.
Insert the protection tube over the entire length of the inside of this insulation protection tube.
The special feature is that the heating pipe is a pipe that runs without contact.
The non-contact type wire according to any one of claims 1 to 3
Strip heating device. 5. A tubular resistance generator having a metallized terminal portion formed therein.
Heat resistance and wear resistance for both ends of heating element and introduction of heated filament
Characterized by connecting with a tubular guide made of insulating material
The non-contact type wire according to any one of claims 1 to 4.
Material heating device. 6. A metallized terminal portion and a tubular guide are heat-insulated.
A special feature is that it can be air-cooled by exposing it to the outside of the heat insulating material.
The non-contact type wire according to any one of claims 1 to 4
Strip heating device. 7. A plurality of tubular resistance heating elements are connected in a longitudinal direction.
And connect the connecting part with a joint made of insulating material.
The non- use according to any one of claims 1 to 6, characterized in that
Contact type filament heating device. 8. A tubular resistance heating element near one terminal or
A gas guide for controlling the atmosphere inside the heating tube
An introduction port for introducing is formed, and
Is characterized in that the atmosphere inside the heating tube can be controlled.
The non-contact type wire rod member according to any one of claims 1 to 7.
Thermal device.