JPH0518222U - Bus duct with space heater - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a bus duct with a space heater that has a small number of parts and does not require much time for assembly. [Structure] A plurality of space heaters are provided in a duct casing 1, and a lead wire 5 for supplying power to these space heaters.
And a space 21 through which the lead wire 5 is drawn is formed between the duct casing 1 and the member 3 that supports the conductor 2 in the duct casing 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bus duct with a space heater in which the support means for the space heater lead wire provided in the bus duct is improved.

[0002]

[Prior Art]

 Regardless of whether the voltage is low or high, the temperature inside the bus duct rises considerably while the conductor is energized. Therefore, depending on the environment, when the energization is stopped, the temperature inside the bus duct may drop rapidly, and dew condensation may occur inside the duct. In order to prevent such dew condensation, a plurality of space heaters are installed in the bus duct in the lengthwise direction, and the plurality of space heaters are energized at the same time when the energization is stopped, or The space heaters are energized to keep the temperature inside the duct above the dew point.

FIG. 4A is a vertical cross-sectional view of a conventional low-pressure bus duct equipped with a space heater, FIG. 4B is a horizontal cross-sectional view thereof, and FIG. 4C is an enlarged view of a circle C ₁ portion in FIG. 4B. In these drawings, an insulating holder 3 for sandwiching and supporting the strip-shaped conductor 2 from above and below is provided on the upper surface plate 1a and the lower surface plate 1b of the duct casing 1 evenly arranged in the longitudinal direction of the duct. Numeral 4 is provided on one side wall 1c of the duct casing 1 at intervals. The space heater 4 is supplied with power from the lead wire 5 laid on the side wall 1c as described later.

The manner of laying the lead wire 5 is shown in FIGS. 4B and 4C. In these figures, a presser metal 6 distributed in the longitudinal direction of the duct casing 1 is fixed to the inner surface of the side wall 1c by welding. In the figure, 6a indicates a welded portion. Thus, the lead wire 5 is attached to the fixing bolt 7 screwed and fixed to the presser foot 6 by a string 8 made of an insulating material. The presser foot 6 is provided at intervals of 300 to 400 mm, and the space heater 4 has an output of about 100 to 200 W and is provided at intervals of 2 to 3 m. Further, the space heater 4 is installed on the side wall 1c of the duct casing 1 in order to provide a sufficient insulation distance with respect to the conductor 2.

5A, in which the same parts as those in FIGS. 4A to 4C are denoted by the same reference numerals, is a vertical cross-sectional view of a conventional high-pressure bus duct equipped with a space heater, FIG. 5B is its cross-sectional view, and FIG. 5C is FIG. 5B. 3 is an enlarged view of a circle C ₂ part in FIG. In these figures, above the lower surface plate 1b of the bus duct casing 1, there are provided insulator supports 9 distributed in the longitudinal direction of the duct casing in the transverse direction of the duct casing 1, and insulators 10 are attached to the upper surface of the insulator support 9. Has been. The conductor 2 is supported by these insulators 10, and the space heater 4 is provided below the one side wall 1b of the casing 1 between the insulators. The lead wire 5 is installed in the same manner as the low-voltage bus duct shown in FIGS. 4A to 4C.

[0006]

[Problems to be solved by the device]

 There are the following problems in both the low-voltage bus duct and the high-voltage bus duct described above. (1) That is, since the presser foot 6 is fixed to the side wall 1c of the duct casing by welding, it takes a lot of work time to assemble the casing. Also, since the above hardware must be installed at intervals of 300 to 400 mm, the above-mentioned working time will be remarkably long when the duct length is large. (2) It requires many parts such as the presser foot 6, the fixing bolt 7, the string 8 and the like. (3) It is difficult to provide a space heater after laying a bus duct without the presser foot 6 attached beforehand. The present invention has been made based on the above circumstances, does not require much time for assembling the duct casing, has a small number of parts, and can easily install a space heater and change lead wires in the bus duct after installation. The aim is to provide a bus duct with a space heater that can be obtained.

[0007]

[Means for Solving the Problems]

 A bus duct with a space heater according to the present invention comprises a plurality of space heaters in a duct casing, and a lead wire for supplying electricity to these space heaters. A space through which the lead wire is drawn is formed between the duct casing and the duct casing.

[0008]

[Action]

 In the bus duct with space heater of the present invention having the above structure, various parts for supporting the lead wires on the bus duct casing are not required. In addition, since the metal fittings are not used, the welding work for attaching and fixing them is not necessary, and the man-hours and time for assembling the duct casing can be reduced.

[0009]

【Example】

 FIG. 1 in which the same parts as those in FIGS. 4A to 4C are denoted by the same reference numerals is an enlarged cross-sectional view of a main part of an embodiment in which the present invention is applied to a low voltage bus duct. In this figure, the lower surface of the end portion on the side wall 1c side of the insulating holder 3 attached to the lower surface plate 1b is cut off obliquely, and a space 21 having a triangular cross section is formed between the cut surface 3a and the lower surface plate 1b. ing. Further, the lower surface plate 1b is detachably attached to the side wall 1c with a screw 22. The lead wire 5 for the space heater extends through the space 21.

The wiring from the lead wire 5 to the space heater (not shown in FIG. 1) is drawn out through a gap between the end portion of the insulating holder 3 and the reinforcing material 1d (side wall 1c in the portion without the reinforcing material 1d). ing.

In the embodiment having the above-mentioned configuration, parts such as a space heater pressing metal piece, a fixing bolt and a string are not required. Further, since it is not necessary to attach the space heater pressing metal to the duct casing side wall 1c by welding, the man-hour and time required for assembling the casing can be significantly reduced. Furthermore, since the lower plate 1b of the casing 1 is detachable, the lead wire 5 can be easily changed or repaired. Even if the bus duct is originally not provided with the space heater, the space heater can be installed after the installation.

FIG. 2 in which the same parts as those in FIGS. 5A to 5C are denoted by the same reference numerals is an enlarged cross-sectional view of an essential part of an embodiment in which the present invention is applied to a high-voltage bus duct. In this figure, a notch 9a is provided at the end of the insulator support 9 on the side wall 1c side, and the lead wire 5 for the space heater is drawn into the notch 9a. Also in this embodiment, it is possible to reduce the number of parts, the number of duct casing assembling steps, and the assembling time.

The present invention is not limited to the above embodiments. For example, in the embodiment shown in FIG. 1, the bottom plate 1b does not need to be detachable unless the space heater is installed after the bus duct is laid and the lead wire is changed. Further, in the embodiment shown in FIG. 2, the lower surface plate 1c may be detachable similarly to the embodiment shown in FIG. Further, in the embodiment shown in FIGS. 2A to 2C, the notch 9a through which the lead wire 5 extends is not only provided at the end of the illustrated insulator support 9, but also as shown in FIGS. 3A and 3B. You may provide in the surface which contacts the lower surface plate 1b of 9 as a semicircular or triangular notch 9b.

[0014]

[Effect of the device]

 As is clear from the above, the bus duct of the present invention does not require a large number of parts such as a presser metal fitting, a fixing bolt, and a cord to lay a lead wire for a space heater, and can be assembled easily and in a short time. . Also, by making the lower surface plate of the duct casing detachable, the space heater lead wire can be easily changed and repaired. Further, the space heater can be easily installed in the existing bus duct which originally does not have the space heater.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an essential part of an embodiment in which the present invention is applied to a low-voltage bus duct.

FIG. 2 is an enlarged sectional view of an essential part of an embodiment in which the present invention is applied to a high voltage bus duct.

FIG. 3A is a sectional view of a main part of a modification of the embodiment shown in FIG. 2, and B is a sectional view of a main part of another modification.

4A is a vertical cross-sectional view of a conventional low-pressure bus duct equipped with a space heater, B is a cross-sectional view thereof, and C is an enlarged view of a circle C ₁ portion in FIG. 4B.

5A is a vertical cross-sectional view of a conventional high-pressure bus duct equipped with a space heater, B is a cross-sectional view thereof, and C is an enlarged view of a circle C ₂ portion in FIG. 4B.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bus duct casing 1c ... Lower surface plate 2 ... Conductor 3 ... Insulation holder 3a ... Cut-off surface 4 ... Space heater 5 ... Lead wire 6 ... Press metal 7 ... Fixing bolt 8 ... String 9 ... Insulator support 9a ... Cutout 10 ... Insulator 21 ... space 22 ... screw

Claims (1)

[Scope of utility model registration request] 1. A duct casing having a plurality of space heaters, and having lead wires for supplying electric power to these space heaters, wherein a space is provided between a member for positioning and supporting a conductor in the duct casing and the duct casing. A bus duct with a space heater, characterized in that a space for passing the lead wire is formed.