JP5463031B2 - Heater unit and method for manufacturing heating element - Google Patents

Description

  The present invention relates to a heater unit and a method for manufacturing a heating element. More specifically, the present invention relates to a heater unit having a heating element having a meandering current path and a holding part for holding the heating element, and a method for manufacturing the heating element.

  Conventionally, as a heater unit as described above, for example, one described in Patent Document 1 is known. Patent Document 1 describes a heating element made of a resistor plate provided with a bent portion and formed into a wave shape. This heating element is formed into a wave shape by punching or pressing, and further formed into a rectangular tube shape and accommodated in a heat insulating container, and a relatively long heating element is not considered. Further, since the heating element is formed in a wave shape, it can be easily held with a small number of support pieces, but details thereof are not sufficiently disclosed.

On the other hand, if a long plate-like heating element is held at both ends with a long span, sufficient strength against deformation due to its own weight and heating cannot be obtained. Therefore, the heating element has to be installed with a short span, which limits the efficiency of the heater unit.
Japanese Utility Model Publication No. 1-75800

  In view of such a conventional situation, an object of the present invention is to provide a heater unit capable of suppressing deformation due to heating and its own weight even with a relatively long heating element, and a method for manufacturing the heating element. To do.

  In order to achieve the above object, the heater unit according to the present invention is characterized in that a heating element having a meandering current path and a holding part for holding the heating element are provided, and the current path is a long plate. The arc-shaped main portion that protrudes upward with respect to its longitudinal direction and a connecting portion that connects between the main portions, and one end is fixed above the heating element and suspended vertically. A guide body that guides the heat deformation of the heating element in the vertical direction, and each main portion has a through-hole that bends symmetrically with respect to the width direction orthogonal to the longitudinal direction and penetrates the guide body; The holding portion is provided with a conductive member formed in the same width as the main portion at the peripheral portion of the through hole in which the current path is formed narrower than other portions of the main portion by the through hole. Consists of a pair of insulators having grooves for locking the connecting portions. In that the looped arcuately the connection or the heating element and its vicinity by locked between the groove of the pair of insulator with respect to the longitudinal direction.

  According to the above characteristic configuration, the vertical load due to gravity can be dispersed by hanging the heating element in a circular arc shape between the pair of insulators, and the entire heating element is excellent in strength. And since each main part is bent symmetrically with respect to the width direction orthogonal to the longitudinal direction, it is excellent also in the intensity | strength with respect to the deformation | transformation to the width direction by the heating of a heating element and its own weight. Moreover, since the current path is secured by providing a conductive member formed in the same width as the main part at the peripheral part of the through hole in which the current path is narrower than the other part of the main part by the through hole, the peripheral part of the hole is secured. Heat generation at is suppressed. Thereby, thermal deformation in the vicinity of the hole of the heating element is suppressed as compared with other main parts and reinforcement by the conductive member is performed, so that deformation of the heating element in the width direction is further suppressed.

  The guide body and the through hole may be provided at one central position in the longitudinal direction of the main portion. Further, a rod-shaped guide body arranged substantially vertically may be fixedly arranged above the main portion, and the guide body may be inserted into a hole formed in the main portion. The guide body can guide deformation due to thermal expansion of the heating element in the vertical direction, further suppress deformation in the width direction of the main part, and prevent a short circuit or the like due to contact between adjacent main parts.

  In such a case, it is desirable that a pin for preventing the heating element from falling off is provided at the lower end of the guide body penetrating the through hole. Thereby, even if the heating element is greatly deformed in the vertical direction, the pin can prevent the heating element from drooping or dropping.

  The height of the top of the main part from the horizontal plane connecting both ends of the main part may be 15 to 50 with respect to the width 100 of the main part bent in a V shape. On the other hand, the height of the top of the main part from the horizontal plane connecting both ends of the main part is preferably 10 or more and 40 or less with respect to the width 100 of the main part that is bent and bent.

  It is desirable that the connecting portion is locked with a clearance allowing the swinging about the edge of the heating element to the groove of the pair of insulators. This clearance allows rocking around the edge of the heating element due to thermal expansion of the heating element, and prevents the heating element from being broken or dropped.

  Moreover, the heat generating element manufacturing method according to the present invention is characterized in that, in the heating element manufacturing method used in the heater unit described in any one of the above characteristic configurations, a plurality of plate-like long members are orthogonal to the longitudinal direction. Bending in the width direction, connecting the ends of the plurality of elongated members bent to form a meandering current path, the entire current path is bent in the longitudinal direction, and one end of the heating element A through-hole is formed in the elongated member that is fixed above and suspended in the vertical direction and penetrates the guide body that guides thermal deformation of the heating element in the vertical direction. The current path is ensured by providing a conductive member formed in the same width as the main part at the periphery of the through hole in which the current path is formed narrower than this part.

  According to the features of the heater unit and the method for manufacturing a heating element according to the present invention, even a relatively long heating element can suppress deformation due to heating and its own weight. As a result, the heating element can be installed with a long span, and it is possible to perform uniform heating and improve the heating efficiency.

  Other objects, configurations, and effects of the present invention will become apparent from the following embodiments of the present invention.

Next, the present invention will be described in more detail with reference to the accompanying drawings as appropriate.
As shown in FIGS. 1 and 2, the heater unit 2 according to the present invention generally includes a heating element 3, a holding portion 4 that holds the heating element 3, a ceiling member 6 that covers the upper surface of the heating element 3, and these. It consists of a frame 7 to be attached. The holding part 4 is composed of a pair of insulators 40a and 40b, and the heating element 3 is stretched between the insulators 40a and 40b in an arc shape in the longitudinal direction X. The guide portion 5 is composed of a guide body 50 and an insulator 60 and is provided at the approximate center in the longitudinal direction X of the frame 7.

  As shown in FIGS. 1 and 2, the frame 7 is formed by forming a thin horizontal frame 7a formed in an arc shape in the width direction Y and a vertical frame 7b having an L-shaped angle in a lattice shape, and the horizontal frame 7a. A pair of side frames 7c are provided at both ends. The ceiling member 6 is formed by laminating a plurality of thin plate members, placing them on the horizontal frame 7a and the vertical frame 7b, curving in the longitudinal direction X, and attaching to the side frame 7c. For example, as shown in FIGS. 3 and 4, the heater unit 2 is continuously installed in the width direction Y below the ceiling wall 101 of the furnace 100, and is connected via the connecting portion 10 to constitute the ceiling structure 1. To do.

  As shown in FIGS. 3 and 4, a gap 11 in which a gas pipe 14 for introducing a gas into the central part of the furnace 100 can be arranged is formed in the connecting part 10 of the ceiling structure 1. The gap 11 is closed by a closing member 12, and a gas pipe 14 is passed through a through hole 13 of the closing member 12. The closing member 12 prevents dust such as oxide generated from the ceiling wall 101 from the connecting portion 10 to the center of the furnace 100.

  As shown in FIGS. 1, 2, and 5, the heating element 3 has a meandering shape including a plurality of main portions 31 that are linear and parallel to each other and a plurality of connection portions 34 that connect the main portions 31 at the end portions 33. Current path 30 is formed. The heating element 3 holds and holds the connecting portion 34 with a pair of insulators 40a and 40b. By connecting each main part 31 in parallel at equal intervals, uniform heating is possible and the heating efficiency of the heating element is improved. The main portion 31 is bent in a substantially V shape with respect to the width direction Y orthogonal to the longitudinal direction X to form a top portion 32, and is formed in an arc shape whose upper side is convex with respect to the longitudinal direction X. is there. By forming it in an arc shape, it is possible to disperse the vertical load due to gravity, and the heat generating body 3 as a whole has excellent strength and can be spanned between a pair of insulators 40a and 40b having a wide span. When the heat generating element 3 undergoes thermal deformation such as thermal expansion due to energization heating, a load that falls on the main portion 31 in the width direction Y is generated. Therefore, by bending each main part 31 symmetrically about the center plane S with respect to the width direction Y, the strength in the width direction Y increases, and deformation in the width direction Y can be suppressed. Due to the arc shape with respect to the longitudinal direction X and the bending with respect to the width direction Y, the deformation of the heating element 3 in the width direction Y and the vertical direction Z can be suppressed. Therefore, the heating element can be increased in size. A current-carrying member 8 that energizes the heating element 3 is connected to both ends of the current path 30. In the present embodiment, the top 32 is located on the ceiling wall 101 side in the vertical direction Z.

  As shown in FIGS. 5 and 8, a through hole 36 through which the guide body 50 passes is provided in the approximate center of the main portion 31, and a substantially rectangular conductive member 37 is attached to the upper surface of the peripheral edge of the through hole 36. It is. Since the main portion 31 in the vicinity of the through hole 36 is narrower than the other main portions 31, heat is easily generated by energization, and thermal deformation is likely to occur. Therefore, by providing the conductive member 37, a current path in the vicinity of the through hole 36 is secured, and heat generation at the portion is suppressed. Thereby, the thermal deformation in the vicinity of the through-hole 36 can be suppressed more than the other parts of the main portion 31, and the suppression of the thermal deformation in the width direction Y by the guide body 50 described later can be functioned more reliably.

  As shown in FIGS. 2 and 5, the end portions 33 are alternately connected via the connecting members 35 so that the entire heating element 3 forms a serpentine current path 30. As shown in FIG. 9A, the connection member 35 is attached to both surfaces of the end portion 33 and constitutes the connection portion 34. Similarly to the conductive member 37 described above, the connection member 35 suppresses heat generation at the connection portion 34 and suppresses thermal deformation more than the portion of the main portion 31. Thereby, falling off of the end portion 33 from the insulators 40a and 40b due to thermal deformation can be suppressed.

  As shown in FIG. 6, the insulator 40 a is provided with a groove 41 that locks the connecting portion 34. The groove 41 is formed in a mountain shape so as to follow the cross-sectional shape of the heating element 3. Further, as shown in FIG. 9, the groove 41 is formed larger than the thickness of the connecting portion 34 so as to form a clearance C between the connecting portion 34 and the groove 41 in a state where the heating element 3 is locked. is there. With this clearance C, the heating element 3 can swing with respect to a direction M centering on the edge 33 a of the end 33. Thereby, the clearance C absorbs the fluctuation in the vertical direction Z due to the thermal expansion of the heating element 3, and prevents the heating element 3 from falling off the groove 41 and the heating element 3 from being damaged by the expansion pressure. One end of the groove 41 is formed with a connection portion 42 to which the energizing member 8 connected to the heating element 3 is attached. The insulator 40b is formed in the same manner as the insulator 40a, and is different in that the connecting portion 42 is not provided.

  As shown in FIGS. 1 and 2, the pair of insulators 40 a and 40 b are attached to the side frame 7 c via the attachment member 43 and the attachment hole 44 with the grooves 41 facing each other in the longitudinal direction X. As shown in FIG. 9, the connection portion 34 is inserted substantially perpendicularly into the groove bottom portions 41 a of the insulators 40 a and 40 b with respect to the arc shape of the heating element 3. In the present embodiment, the heating element 3 is held by two sets of insulators 40a and 40b.

  As shown in FIG. 7, the guide body 50 is made of a thin plate, is fixedly disposed above the main portion 31 by an insulator 60, and is suspended in a substantially vertical direction. The guide body 50 is provided with a hole 52 for attaching a bent portion 51 at one end and a rod-like pin 53 at the other end. As shown in FIG. 8, the guide body 50 is inserted into the through hole 36 of the main portion 31 and guides the thermal expansion of the heating element 3 in the vertical direction Z. Thereby, the thermal deformation to the width direction Y of the main part 31 is suppressed, and the short circuit by the contact of the main parts 31 etc. is prevented. Further, the pin 53 is curved so as to follow the shape of the main part 31, and prevents the heating element 3 from drooping or the heating element 3 from dropping due to its own weight and heating.

  The insulator 60 has a plurality of grooves 61 for engaging the bent portion 51 of the guide body 50 and a plurality of mounting holes 62 for passing through a mounting tool 63 such as a bolt. The upper portion of the groove 61 is open, and the guide body 50 is passed through the through hole 61 a of the groove 61 from the opening to lock the bent portion 51 to the groove 61. Then, the bent portion 51 is fixed by filling an insulating material such as cement. In the present embodiment, four insulators 60 are arranged in the width direction Y and fixed to the vertical frame 7b.

Here, a method of manufacturing the heating element 3 will be described with reference to FIG.
First, as shown in FIG. 10A, in a thin plate long member 200 having a length of 956 mm, a width of 20 mm, and a thickness of 1 mm made of, for example, Fe—Cr—Al or a nickel chromium alloy, a through-hole 36 is formed at a substantially central portion thereof. Form. Next, as shown in FIGS. 2B and 2C, the thin plate elongate member 200 is bent in a substantially V shape at an angle θ of about 120 ° symmetrically with respect to the center plane S in the width direction Y to form a top portion 32. To do. And the electroconductive member 37 bent similarly is attached to the through-hole 36 peripheral part of bent thin plate elongate member 200 'by welding.

  Next, a plurality of elongated thin plate members 200 ′ bent in the same manner as described above are arranged in parallel, and the end portions 201 ′ are alternately connected by the connection members 35 to form a meandering current path 30. Then, the heating element 3 is formed by curving the whole connected plurality of thin long plate members 200 ′ in an arc shape with respect to the longitudinal direction X. In the present embodiment, the heating element 3 is composed of 26 thin plate long members 200.

Finally, reference is made to the possibilities of other embodiments of the invention. In addition, the same code | symbol is attached | subjected to the member similar to the above-mentioned embodiment.
In the above-described embodiment, the main portion 31 is arranged such that the long thin plate member 200 is bent in a V shape at an angle of about 120 °, and the top portion 32 is positioned (upward) on the ceiling wall 101 side. However, the top 32 may be positioned (downward) inside the furnace 100. Further, the bending is not limited to the V shape, and may be curved in an arc shape.

Here, the bending of the thin long plate member 200 will be described.
According to the experiments by the inventors, as shown in FIG. 10 (c), when the thin plate long member 200 of the present embodiment is bent into a V shape, the width W of the thin plate long member 200 ′ after bending is set. Assuming 100, it has been found that the height H of the top 32 from the horizontal plane connecting both ends 201 ′ should be 15 or more and 50 or less. Further, when the thin long plate member 200 is curved (R bending), it has been found that the height H of the top 32 is preferably 10 or more and 40 or less with respect to the width W100 of the thin long plate member 200 ′. . If the bending is within this range, the strength of the heating element 3 in the vertical direction Z and the strength against dripping or deformation of the heating element 3 due to heat generation can be secured, and the radiation efficiency of the heating element 3 can be sufficiently secured. This range is the same regardless of whether the position of the top portion 32 is located above or below the horizontal plane connecting both end portions.

  In the above embodiment, the conductive member 37 is fixed to the upper surface of the main portion 31 by welding. However, the conductive member 37 is not limited to the upper surface of the main portion 31 and may be attached to the lower surface side, or may be attached to both surfaces. Moreover, although the connection member 35 was attached to both surfaces of the edge part 33, respectively, it may be either an upper surface or a lower surface.

  In the above embodiment, one guide portion 5 is provided at the approximate center in the longitudinal direction X of the heating element 3. However, a plurality of guide portions 5 may be provided in the longitudinal direction X. However, in consideration of the number of parts of the heater unit 2 and the work efficiency of the assembly, it is desirable to provide the heater unit 2 at one central position in the longitudinal direction X as in the above embodiment.

  In the above embodiment, the pin 53 of the guide portion 5 is formed by bending a rod-shaped member. However, the shape of the embodiment is not limited as long as the shape can prevent the heating element 3 from drooping or dropping due to its own weight and thermal deformation.

  Insulating materials constituting the insulators 40a, 40b, 60 in the above embodiment include ceramics, silicon carbide, silicon nitride and the like mainly composed of alumina, alumina silica, mullite, zircon or cordierite. Various things can be used. Moreover, the kind and mixing | blending of the material which comprises these insulating materials can be suitably changed according to the operating temperature etc. of a heat generating body.

  In the above embodiment, two sets of insulators 40a and 40b and four sets of insulators 60 are used. However, the length and quantity of these may be set as appropriate according to the size of the heater unit 2. Further, although the heating element 3 is formed by connecting the 26 long thin plate members 200, the number and size of the thin long plate members 200 may be appropriately set according to the size of the heater unit 2.

  In the above embodiment, the meandering current path 30 is formed by connecting the linear main portions 31 in parallel with each other at regular intervals, as shown in FIG. However, as shown in FIG. 5B, the main portions 31 may be arranged at unequal intervals. Further, as shown in FIG. 5C, the main portions 31 may not be arranged in parallel to the direction X in which the main portions 31 are spanned. However, the current path of the above embodiment is excellent in terms of holding the heating element, manufacturing, heating efficiency, and the like.

  Moreover, in the said embodiment, the several thin plate elongate member 200 was connected and the meandering current path 30 was formed. However, for example, a thin plate may be punched and connected to form a meandering current path, and the processed thin plate may be connected to produce a heating element.

  The heater unit according to the present invention can be used as a heat treatment heater for glass, ceramic, cermet, metal and the like. It can also be applied to a pottery furnace, a reaction furnace, a diffusion furnace, and the like. Further, it may be used for food processing or liquid processing.

It is a front view of the heater unit concerning the present invention. It is a rear view of the heater unit concerning the present invention. It is a longitudinal section of the furnace which shows typically the state where the ceiling structure consisting of a plurality of heater units was attached to the furnace. It is a partial enlarged plan view near a gas pipe. It is a partial enlarged plan view of a heating element. (A) is a side view of an insulator, (b) is a front view, and (c) is a rear view. It is a figure which shows the state which attached the guide body to the insulator, (a) is a front view, (b) is a side view. It is a partial expanded end view of the vicinity of the through hole of the heat generating body main part. It is a figure which shows the state which latched the heat generating body to the holding | maintenance part, (a) is a partial expanded sectional view, (b) is an enlarged view by the tangential view of a heat generating body. (A) is a top view of a thin plate elongate member, (b) is a top view in the state which performed bending processing to the thin plate elongate member, and formed the main part, (c) is A- of (b). It is A sectional view. It is a top view which shows typically a heat generating body, (a) is a heat generating body concerning a first embodiment, (b) is a heat generating body concerning other embodiments, and (c) is based on other embodiments. It is a heating element.

Explanation of symbols

1: ceiling structure, 2: heater unit, 3: heating element, 4: holding part, 5: guide part, 6: ceiling member, 7: frame, 7a: horizontal frame, 7b: vertical frame, 7c: side frame, 8: energizing member, 10: connecting portion, 11: gap, 12: closing member, 13: through-hole, 14: gas pipe, 30: current path, 31: main portion, 32: top portion, 33: end portion, 33a: End edge, 34: connection part, 35: connection member, 36: through hole (hole), 37: conductive member, 40a, 40b: insulator, 41: groove, 41a: bottom part, 42: connection part, 43: attachment Member: 44: hole, 50: guide body, 51: bent portion, 52: hole, 53: pin, 60: insulator, 61: groove, 61a: through hole, 62: mounting hole, 63: mounting tool (bolt ), 100: furnace, 101: ceiling wall, 200: thin plate long member, C: clearance, H Height, M: swing direction, S: center plane, W: width, X: longitudinal direction, Y: width direction, Z: vertical (perpendicular) direction

Claims (7)

A heater unit having a heating element having a meandering current path and a holding part for holding the heating element,
The current path is formed of a long plate-like shape and an arcuate main portion that protrudes upward in the longitudinal direction and a connecting portion that connects each main portion,
One end is fixed above the heating element and is suspended in the vertical direction, and has a guide body that guides thermal deformation of the heating element in the vertical direction,
Each main part has a through hole that is bent symmetrically with respect to the width direction orthogonal to the longitudinal direction and penetrates the guide body,
By providing a conductive member formed in the same width as the main part at the peripheral part of the through hole in which the current path is formed narrower than the other part of the main part by this through hole, the current path is secured,
The holding part is composed of a pair of insulators having grooves for locking the connection part,
A heater unit in which the connecting portion or the vicinity thereof is locked between the grooves of the pair of insulators, and the heating element is stretched in an arc shape in the longitudinal direction. The heater unit according to claim 1, wherein the guide body and the through hole are provided at one central position in the longitudinal direction of the main portion. The heater unit according to claim 1 or 2, wherein a pin for preventing the heating element from falling off is provided at a lower end of the guide body that penetrates the through hole. The height of the top part of the main part from a horizontal plane connecting both ends of the main part with respect to the width 100 of the main part bent in a V shape is 15 or more and 50 or less. The heater unit as described in. The height of the top part of the main part from a horizontal plane connecting both ends of the main part with respect to the width 100 of the main part bent and bent is 10 or more and 40 or less. The heater unit described. The heater unit according to any one of claims 1 to 5, wherein the connection portion is locked with a clearance that allows rocking about the edge of the heating element to the groove of the pair of insulators. A method for producing a heating element used in the heater unit according to claim 1,
Bending a plurality of plate-like long members with respect to the width direction orthogonal to the longitudinal direction,
Connecting the ends of the plurality of elongated members bent to form a meandering current path;
Bending the entire current path with respect to the longitudinal direction,
One end is fixed above the heating element and is suspended in the vertical direction, and a through hole is formed in the elongate member to penetrate the guide body that guides the heat deformation of the heating element in the vertical direction.
Production of a heating element that secures the current path by providing a conductive member formed in the same width as the main part at the peripheral part of the through hole in which the current path is narrower than the other part of the main part by the through hole Method.

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