JPH1116652A - Structure for connecting heater and power supplying bus bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect a heater and a bus bar to each other in a short time, and to sufficiently supply the current by pushing a part of a belt body, which is wound around a part of a surface of a bus bar, to the surface of the bus bar with a clip. SOLUTION: A heater 14 and bus bars 13a, 13b are connected to each other by mesh-like belt bodies 12a, 12b made of the conductive material such as aluminum, and power is supplied to the heater 14 from the bus bars 13a, 13b. The belt-like bodies 12a, 12b are made to abut on the surface of the bus bars so that the longitudinal direction of the belt-like bodies 12a, 12b and the drawing direction of the bus bars 13a, 13b cross each other, and they are pinched by a clip 15 so as to push the belt-like bodies to the surface of the bus bars 13a, 13b. The other end of the belt-like bodies 12a, 12b are screwed with a heater terminal 14b, in which heater main bodies 14a are bound, by a bolt 16 and a nut 17. As a clip 15, a spring steel clip having the simple structure and excellent heat resistance is used, and a non-spring metal clip or a non-metal clip can be used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure between a heating element and a bus bar for supplying power, and more particularly, to a heating structure in which a heating element and a bus bar for supplying power are connected via a strip made of a conductive material. It relates to the connection structure between the body and the busbar.

[0002]

2. Description of the Related Art As shown in FIG. 6, in a conventional round firing furnace 50, a plurality of heating elements (heaters) 54 are provided with bus bars 53 for supplying power.
a, 53b. In this example, 18
The three bus bars 53a, 5
3b is shared.

FIG. 7 shows a structure of a connecting portion (portion surrounded by a dashed line in FIG. 6) 51 between a heating element 54 and bus bars 53a and 53b for supplying electric power. As shown in FIG. 7, a heating element 54 and bus bars 53a, 53b for supplying power are provided.
Is a strip made of a metal mesh material (hereinafter referred to as
One end of each of the strips 52a, 52b is connected to a flat bus bar 53a, 53b by a bolt 55 and a nut 56. In this example, the other ends of the strips 52a and 52b are also connected to the heating element 54 by bolts 55 and nuts 56. In this way, by electrically connecting the heating element 54 and the bus bars 53a, 53b for supplying power, the bus-shaped members 52a, 53b are separated from the bus bars 53a, 53b.
The required power can be supplied to the heating element 54 via the connection 52b.

However, in the conventional connection structure, the strips 52a and 52b and the bus bars 53a and 53b are connected to the bolts 5a and 53b.
5 and nut 56,
The screwing operation has to be performed using a tool such as a spanner, and there is a problem that the connection is troublesome. Especially,
When there are many connection points as in the firing furnace 50 in FIG. 6, a great amount of time is required for connection. Further, in the case where the heating element 54 needs to be replaced, it is necessary to remove the existing heating element 54, which requires a longer time.

In the conventional connection structure, the heating element 5
4 easily causes seizure of the bolt 55 and the nut 56. When this seizure occurs, the bolt 5
It becomes difficult to remove the screw engagement between the nut 5 and the nut 56, and it takes more time and effort. By moving the screw positions of the strips 52a, 52b and the bus bars 53a, 53b away from the heating element 54, seizure of the bolts 55 and the nuts 56 can be suppressed and prevented. In practice, it is not possible to increase the distance between the screwing position and the heating element 54 due to an increase in wiring resistance due to an increase in the length of 52a, 52b.

Further, in the above-described conventional connection structure, the cross-sectional area of the bus bar 53a, 53b provided with the bolt insertion hole (not shown) is reduced, the wiring resistance is increased, and the current supply is restricted. There is a problem that the heating element 54 cannot be sufficiently heated.

The present invention has been made to solve the above-mentioned problems, and it is possible to connect the heating element and the bus bar in a short time, and it is not necessary to form a hole for screwing in the bus bar. It is an object of the present invention to provide a connection structure between a heating element and a bus bar for supplying power, which can supply current to the heating element.

[0008]

In order to achieve the above-mentioned object, a connection structure of a heating element and a bus bar for supplying power according to the present invention comprises connecting the heating element and the bus bar for supplying power with a belt-like body made of a conductive material. In the connection structure of the heating element and the bus bar, the band is wound around a part of the surface of the bus bar, and a portion of the band that is wound around the bus bar is pressed against the surface of the bus bar by a clip. And

[0009] Further, the present invention is characterized in that the belt-like body is formed of a mesh-like material obtained by knitting a conductive material.

[0010] Further, irregularities are formed in a portion of the surface of the bus bar where the strip is pressed.

The clip is made of a metal material having a spring property.

Further, the bus bar is a solid hollow rod.

Further, the bus bar is characterized in that the surface of the bus bar is coated with metal plating for rust prevention.

Further, two open annular busbars arranged substantially in parallel at a predetermined interval, and a plurality of heat generating units arranged at a predetermined interval in the circumferential direction between the two busbars. It is characterized by connecting with the body.

[0015]

The connection structure between the heating element and the bus bar for power supply according to the present invention is a connection structure between the heating element and the bus bar in which the heating element and the bus bar for power supply are connected via a band made of a conductive material. The body is wrapped around a part of the surface of the bus bar, and the part of the band that is wrapped around the surface of the bus bar is pressed against the surface of the bus bar with a clip, so simply clip the bus bar together with the clip from the top of the band, The strip and the busbar can be connected easily, reliably, and in a short time. Also,
Since the connection is made by using the clip, it is possible to prevent the occurrence of burn-in, and the workability when releasing the connection is improved. Furthermore, by connecting using a clip, unlike the case of screwing using a bolt and a nut, there is no need to make a hole for inserting a bolt in the bus bar, and the inconvenience of limiting the amount of current supply is also eliminated. In the present invention, there is no particular restriction on the specific mode of winding the band around the bus bar, and the band may be wound around the bus bar, or may be wound a plurality of times. Further, it is possible to wind the bus bar so as to make less than one turn (for example, about half turn).

Further, by using a mesh-like material formed by knitting a conductive material as the belt-like body, the belt-like body can be reliably contacted along the surface of the bus bar, and the contact between the belt-like body and the bus bar can be made. Resistance can be reduced.

Further, in the case where irregularities are formed at the portion of the bus bar surface where the band is pressed, the contact area between the band and the bus bar is increased as compared with the case where the bus bar surface is flat. The contact resistance between the bus bars can be reduced. There are no particular restrictions on the specific shape of the irregularities, and various shapes that can increase the contact area between the strip and the busbar can be used.

In the case where a clip made of a metal material having a spring property is used, it is possible to reliably press the band-shaped body against the surface of the bus bar with a simple structure, thereby making the present invention more effective. Can be. Also,
By using a metal material, the clip can be easily manufactured and the clip can have sufficient heat resistance, so that sufficient durability can be secured.

When the bus bar is a solid hollow rod, a sufficient effective area can be ensured, the contact resistance can be reduced, the bending process is easy, and the bus bar can be routed. The degree of freedom of (wiring routing) is improved. The plate-shaped bus bar can be easily bent in the front and back directions, but it is difficult to bend in a direction parallel to the front and back surfaces because it is necessary to twist the work once.

When the surface of the busbar is plated with rust-preventive metal, the surface oxidation (rust formation) of the busbar, which causes the contact resistance between the strip and the busbar to increase with time, is prevented. Can be prevented from increasing with time.

2 are arranged substantially in parallel at a predetermined interval.
When the present invention is applied to connect a plurality of heating elements disposed at predetermined intervals in the circumferential direction between the open annular busbars, the busbars are disposed between the two busbars. A large number of heating elements can be efficiently connected to the bus bar. For example, a heat treatment furnace having a cylindrical heating space can be efficiently manufactured.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

[Embodiment 1] FIG. 1 is a schematic diagram showing a main part of a firing furnace having a connection structure between a heating element and a bus bar for supplying power according to an embodiment of the present invention, and FIG. It is a figure which shows the structure of the connection part (portion enclosed with the dashed-dotted line of FIG. 1) 11 of the busbar for electric power supply.

In this firing furnace 10, a plurality of heating elements (heaters) 14 are used as bus bars 13a, 13b for supplying power.
It is connected to the. In this embodiment, the three bus bars 13a, 13b each of the eighteen heating elements 14 are the same.
Is shared. As shown in FIG. 2, the heating element 14 and the busbars 13a and 13b for supplying power are made of mesh-shaped strips 12a and 12 made of a conductive material such as aluminum.
b, power is supplied to the heating element 14 from the bus bars 13a, 13b via the strips 12a, 12b.

In this embodiment, the strips 12a, 1b are arranged such that the longitudinal direction of the strips 12a, 12b and the extension direction of the bus bars 13a, 13b are orthogonal to each other.
2b is in contact with the surfaces of the bus bars 13a, 13b and the bus bars 13a, 13b of the strips 12a, 12b.
The portions abutting on b are clamped together with the bus bars 13a, 13b by the clip 15 from above the belts 12a, 12b, whereby the belts 12a, 12b are pressed against the surfaces of the bus bars 13a, 13b.

The other ends of the strips 12a and 12b are connected to a heater 14. As shown in FIG. 2, the other side of the strips 12a and 12b is screwed to a heating element terminal 14b that bundles the heating element body 14a with a bolt 16 and a nut 17. Since the strips 12a and 12b can be handled integrally with the heating element 14, there is no particular problem even if they are connected by a screwing method.

The busbars 13a and 13b are solid hollow rods made of a conductive material such as copper or brass, and have a large effective sectional area, which is advantageous in reducing wiring resistance.
However, it is also possible to use a hollow cylindrical body. The surfaces of the bus bars 13a and 13b are plated with rust prevention (eg, nickel plating) in order to prevent the contact resistance from increasing over time due to surface oxidation.

The heating element 14 is, for example, SiC
A ceramic heater is exemplified, but various heaters can be used according to the use of the firing furnace and the like, and a spiral heater can also be used. In addition,
The heating element 14 is formed in two halves along the longitudinal direction.
One heating element main body 14a has a structure in which the heating element terminals 14b are bundled together via a spacer 14c.

As the clip 15, a spring steel clip having a simple structure and excellent heat resistance is used, but a non-spring metal clip or a non-metal (for example, ceramic) clip may be used. Is also possible.

In the firing furnace 10 according to this embodiment, as described above, the same bus bars 13a and 13b are shared by three heating elements 14 each. That is, as shown in FIG.
The bus bar 13a connected to the a and the bus bar 13b connected to the terminal 10b installed on the outer peripheral surface of the firing furnace 10 are bent so as to be substantially L-shaped, and are mounted so as to be located in parallel in the furnace for a certain distance. , Each bus bar 13a, 1
Three heating elements 14 are provided between 3b. Since the bus bars 13a and 13b are round rods having no direction to be bent, the bus bars 13a and 13b can be easily routed in the furnace.

The terminals 10a, 10b are connected to insulators 10c,
10d, it is insulated and fixed to the side surface of the firing furnace 10,
A single-phase power supply is wired to both terminals 10a and 10b, and a current flows through the heating element 14 via the strips 12a and 12b. In this embodiment,
The bus bars 13a, 13b are the same for each of the three heating elements 14.
Are shared, the terminals 10a and 10b and the insulator 10
Since the number of c and 10d is small, the cost can be reduced.

As described above, in this embodiment,
As shown in FIG. 3 (a), the strips 12a, 12b are brought into contact with the surfaces of the bus bars 13a, 13b in such a manner that the longitudinal direction thereof and the direction of extension of the bus bars 13a, 13b are perpendicular to each other. As shown in b), the band members 12a, 12b and the bus bar 1 are simply clamped by the clip 15 together with the bus bars 13a, 13b from above the band members 12a, 12b.
3a and 13b can be easily and reliably connected in a short time. In addition, since the connection is made by using the clip 15, it is possible to prevent the occurrence of burn-in, and the workability when releasing the connection is improved.
Furthermore, by connecting using the clip 15, unlike the case of screwing using bolts and nuts, there is no need to make holes for inserting bolts into the bus bars 13a and 13b, and the amount of current supply is limited. The inconvenience disappears.

[Second Embodiment] FIG. 4 is a view showing a connection structure between a heating element and a bus bar for supplying power according to another embodiment of the present invention. In this embodiment, the bus bars 13a, 1
As 3b, the one having a thread (irregularity) 13S formed on its surface to increase the contact area is used. The other configuration is the same as that of the first embodiment, and the description is omitted. The thread 13S of the bus bars 13a and 13b can be easily formed by threading a round bar. It can also be easily realized by using a long cut bolt.

In the connection structure of the heating element and the busbar for power supply according to the second embodiment, the contact area between the strips 12a and 12b and the busbars 13a and 13b is increased by the thread 13S to reduce the contact resistance. This is advantageous in terms of wiring resistance.

[Embodiment 3] FIG. 5 is a view showing a connection structure of a heating element and a bus bar for supplying power according to still another embodiment of the present invention. In this embodiment, two open annular busbars 13a, 13b and two busbars 13a, 13b are disposed substantially in parallel at a predetermined interval.
A plurality of heating elements 14 are arranged at predetermined intervals in the circumferential direction between the heating elements 14 and the heating elements 14 are formed in a belt-like body (not shown in FIG. 5).
To connect. Note that other configurations are the same as those in the first embodiment, and a description thereof will not be repeated.

In this embodiment, two bus bars 13
Since a and 13b are shared by a total of 18 heating elements 14, and the number of terminals 10a and 10b and the number of insulators 10c and 10d can be reduced to two, a large number of heating elements 14 can be formed with a simple configuration. It is possible to efficiently connect to the bus bars 13a, 13b via the bodies 12a, 12b.

In the case of the third embodiment, as in the case of the second embodiment, the contact area can be increased by forming irregularities such as threads on the surfaces of the bus bars 13a and 13b.

Further, in each of the above embodiments, the connection structure of the heating element and the bus bar for power supply constituting the firing furnace has been described as an example. However, the connection structure of the present invention can be applied to other than the firing furnace. Is possible.

The present invention is not limited to the above-described embodiment in other respects. The present invention relates to materials and shapes such as a band, a bus bar, a heating element, a clip, and the shape of irregularities formed on the bus bar surface. Various applications and modifications can be made within the scope of the invention.

[0040]

As described above, according to the connection structure of the heating element of the present invention and the bus bar for supplying power, the connection structure of the heating element of the present invention and the bus bar for supplying power is formed by connecting the strip to the surface of the bus bar. , And the part wound around the busbar surface of the band is pressed against the busbar surface with a clip, so simply clipping the busbar together with the clip from the top of the band, the band and busbar Can be easily and reliably connected in a short time. In addition, since the connection is made by using the clip, it is possible to prevent the occurrence of burn-in, and the workability when releasing the connection is improved. Further, by connecting using a clip, unlike the case of screwing using a bolt and a nut, there is no need to make a hole for inserting a bolt in the bus bar, and the inconvenience of limiting the amount of current supply is also eliminated.

When a mesh material made of a conductive material is used as the band, the band can be reliably brought into contact along the surface of the bus bar, and the contact between the band and the bus bar can be ensured. Resistance can be reduced.

Further, in the case where the unevenness is formed at the portion of the bus bar surface where the band is pressed, the contact area between the band and the bus bar is increased as compared with the case where the bus bar surface is flat. The contact resistance between the bus bars can be reduced.

When a clip made of a metal material having a spring property is used, the strip can be reliably pressed against the surface of the bus bar with a simple structure, thereby making the present invention more effective. Can be. Also,
The clip can be easily manufactured, and the clip can have sufficient heat resistance to improve durability.

When the bus bar is a solid hollow rod, a sufficient effective sectional area can be secured, the wiring resistance can be reduced, the bending process is easy, and the bus bar can be routed. The degree of freedom of (wiring routing) is improved.

When the surface of the bus bar is plated with metal for rust prevention, the surface oxidation (rust formation) of the bus bar, which causes the contact resistance between the strip and the bus bar to increase with time, is prevented. Can be prevented from increasing with time.

[0046] The two parallel arrangements are provided at predetermined intervals.
When the present invention is applied to connect a plurality of heating elements disposed at predetermined intervals in the circumferential direction between the open annular busbars, the busbars are disposed between the two busbars. A large number of heating elements can be efficiently connected to the bus bar. For example, a heat treatment furnace having a cylindrical heating space can be efficiently manufactured.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a connection structure between a heating element and a bus bar for supplying power according to an embodiment of the present invention.

FIG. 2 is a perspective view illustrating a connection structure between a heating element and a bus bar for supplying power according to an embodiment of the present invention.

FIG. 3A is a perspective view showing a state before a clip of a connection structure between a heating element and a bus bar for supplying power according to one embodiment of the present invention is attached, and FIG. 3B is a state after the clip is attached. FIG.

FIG. 4 is a perspective view showing a connection structure between a heating element and a bus bar for supplying power according to another embodiment of the present invention.

FIG. 5 is a schematic plan view showing a connection structure between a heating element and a bus bar for supplying power according to still another embodiment of the present invention.

FIG. 6 is a schematic plan view showing a conventional connection structure between a heating element and a bus bar for supplying power.

FIG. 7 is a perspective view showing a main part of a conventional connection structure between a heating element and a bus bar for supplying power.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Firing furnace 10a, 10b Terminal 10c, 10d Insulator 11 Connection part 12a, 12b Strip 13a, 13b Bus bar 13S Thread 14 Heating element (heater) 14a Heating element main body 14b Heating element terminal 14c Spacer 15 Clip 16 Bolt 17 Nut

Claims (7)

[Claims] 1. A connecting structure of a heating element and a bus bar, wherein the heating element and a bus bar for supplying power are connected via a band made of a conductive material, wherein the band is wound around a part of the surface of the bus bar. A connection structure between a heating element and a bus bar for power supply, wherein a portion of the band-shaped body wound around the bus bar is pressed against a surface of the bus bar by a clip. 2. A connection structure between a heating element and a bus bar for supplying electric power according to claim 1, wherein said band-like body is formed of a mesh-like material obtained by knitting a conductive material. 3. The connection structure between a heating element and a bus bar for supplying power according to claim 1, wherein irregularities are formed in a portion of the surface of the bus bar where the strip is pressed. 4. The clip according to claim 1, wherein the clip is made of a metal material having a spring property.
Connection structure between the heating element described above and a bus bar for supplying power. 5. The connection structure between a heating element and a power supply bus bar according to claim 1, wherein said bus bar is a solid hollow rod. 6. The connection structure between a heating element and a power supply bus bar according to claim 1, wherein a metal plating for rust prevention is applied to a surface of said bus bar. 7. A plurality of 2 arranged substantially parallel at a predetermined interval.
7. An open annular bus bar and a plurality of heating elements disposed at predetermined intervals in a circumferential direction between the two bus bars. A connection structure between the heating element according to any of the above and a bus bar for supplying power.