JPH0644065Y2 - Heater cable connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a connector to which a heater cable having a heater wire and a conductive wire is connected.

[Prior Art] A conventional sheath heater has a sheath 1 as shown in FIG.
The heater wire 2 is housed inside, the sheath 1 is filled with the inorganic insulating material 3, and the inorganic wire 3 is used to fill the heater wire 2 and the sheath 1.
And are insulated from each other.

For example, as shown in FIG. 5, when several conventional sheath heaters are used and these are connected in series to the power source 5 to heat a long pipe or the like, the terminal 10 of the heater wire 1 on the power source 5 side is Connection is made with a relatively short lead wire 8, and the terminal 11 farthest from the power supply 5 to the power supply 5 is wired with a so-called long lead wire 9.

Further, in the case of heating a long pipe as described above, when a sheath heater is connected in parallel to a power supply, two long lead wires are wired as so-called through lead wires, and a heater wire is provided between them. Are wired like a ladder.

[Problems to be Solved by the Invention] However, when the sheath heater is connected in series or in parallel to heat a long pipe, the return lead wire 9 and the through lead wire as described above have a length equal to or longer than the entire length of the pipe. It must be wired separately from the sheath heater using the lead wire.

In addition, such a series or parallel connection requires a considerable amount of work because once the wiring is completed, a new wiring is required when the series is rewired in parallel and the parallel is rewired in series.

The present invention is intended to solve the above-mentioned problems in the related art, and a heater cable that can connect a heater using one cable and can easily switch between series and parallel A connection body is provided.

[Means for Solving the Problems] That is, in the present invention, in order to achieve the above-mentioned object, the heater wire 2 is provided in the metallic sheath 1 with the inorganic insulating material 3 interposed therebetween.
And at least one more conductive wire 4 than the heater wire 2,
A plurality of heater cables 8 accommodating 4 ′ and the same heater cable 8 provided at the ends of these heater cables 8
Or another heater cable 8 having the heater wire 2 and the terminal portions 7 for connecting the terminals 2a, 4a, 4a ', 2b, 4b, 4b' of the conductive wires 4, 4 '. Provide a connection body.

[Operation] Since the heater cable 8 used in the present invention has one or more conductor wires 4 and 4'than the heater wire 2, one heater wire 4 is associated with each heater wire. You can Then, by connecting an extra conductive wire 4'which does not correspond to the heater wire 2 as a common connection wire and connecting them in series, and connecting to the heater wire 2 at the end, a so-called return conductor wire in the case of series connection. Alternatively, it can be used as a so-called one-way conducting wire in the case of parallel connection. On the other hand, the conductive wire 4 corresponding to the heater wire 2 is not used in the case of series connection, and only the heater wire 2 is connected in series. The conductive wire 4 can be connected in series only when they are connected in parallel and can be used as a so-called other through conductive wire.

Here, the conductive wire 4'used as a common connecting wire is
Even when there are a plurality of corresponding heater wires 2 and conductive wires 4,
Since the number of the heater cable 8 is only one, even if the heater cable 2 has a plurality of heater wires 2, the number of the conductive wires 4 and 4'is one more than that. The series connection and the parallel connection are the same as the heater cable 8 or the heater wire 2 of the other heater cable 8 and the terminals 2a of the conductive wires 4 and 4 '.
It can be changed simply by reconnecting 2b, 4a, 4b, 4a ', 4b'. That is, in the terminal portion 7, it is possible to easily switch between series and parallel simply by changing the connection of these terminals 2a, 2b, 4a, 4b, 4a ', 4b'.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 3.

FIG. 1 shows an example of a heater cable 8 used in the present invention. As shown in this drawing, a heater wire 2 such as a nichrome wire is placed in a cylindrical tubular sheath formed of metal such as stainless steel. And, the conductive wires 4, 4 ', such as copper wires having a sufficiently low electric resistance, are housed therein. Further, the sheath 1 is filled with an inorganic insulating material 3 such as magnesia,
Thereby, the sheath 1, the heater wire 2 and the conductive wire 4,
4'are insulated from each other.

Here, the conductive wires 4 and 4 ′ are housed at least one more than the heater wire 2. Therefore, as shown,
Besides two pairs of wires, three or four conductive wires can be stored for two heater wires.
By housing the heater wire 2 and the conductive wires 4 and 4'in this way, one conductive wire 4 can correspond to one heater wire 2 and an extra conductive wire can be provided. There will be one or more 4 '.

2 and 3, the heater wire 2 is a single conductive wire 4,
In the case where there are two 4 ', examples of connecting three sets of heater cables 8 in series and connecting in parallel are shown.

As is clear from these figures, in each heater cable 8, the heater wire 2 and the conductive wire 4 are made to correspond to each other.
And the remaining conductive wire 4'which is one more than the heater wire 2
, It is used as a common connecting line, and in both the series of FIG. 2 and the parallel of FIG.
The terminals 4a 'and 4b' are sequentially connected with each other, and the terminal 4a 'of the conductive wire 4'is connected with the terminal 2a at the end of the heater wire 2 at the terminal portion 7 at the end. Also, at the terminal 6 on the power supply side,
Power supply 5 is connected to 4a 'and terminal 2a which is the starting point of heater wire 2.
Connect to.

When the heater wire 2 is connected in series as shown in FIG. 2, the conductive wire 4 corresponding to the heater wire 2 is not used, and the terminals of the heater wires 2 and 2 are connected to the terminals 7 and 7 in the middle part.
Connect 2a and 2b sequentially. On the other hand, the heater wire 2 is connected to the power source 5
In the case of connecting in parallel with the above, in the intermediate terminal portion 7, the terminals 4a and 4b of the conductive wire 4 corresponding to the heater wire 2 are sequentially connected to connect these conductive wires 4 in series, and the terminal portion 6, 7, the terminal 5a of each heater wire 2 on the power source 5 side is replaced with the terminal 4a of the corresponding conductive wire 4 on the power source 5 side.
Terminal 2b on the end side of the heater wire 2,
It connects to the terminal 4b 'on the terminal side of the corresponding conductive wire 4'.

The above is the case where the heater wire 2 and the conductive wire 4 correspond one by one, but even when there are a plurality of pairs of the corresponding heater wire 2 and conductive wire 4, the conductive wire 4 used as a common connecting wire. ′
Can be used in common for the heater wire 2 and the conductive wire 4 of each pair, so that only one wire is required. Therefore, the heater cable 8
In the case where there are a plurality of heater wires 2, the number of conductive wires 4, 4'is one more than that. In this case, in the heater cable connection body according to the present invention, a plurality of sets of heaters 2 connected in series or in parallel are completed.

[Advantage of the Invention] As described above, according to the present invention, it is possible to connect the heater wires in series or in parallel with one cable without laying a conductive cable in addition to the sheath cable.
In addition, the connection can be changed between series and parallel only by changing the connection between the heater wire and the conductive wire terminal at both ends of the cable in the terminal portion. Therefore, a highly practical effect that wiring efficiency can be improved can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a cable showing an embodiment of the present invention, FIGS. 2 and 3 are connection diagrams showing wiring examples of the cable, and FIG. 4 is a sectional view of a cable showing a conventional example, FIG. 5 is a connection diagram showing a wiring example of the conventional cable. 1 ... sheath, 2 ... heater wire, 3 ... inorganic insulating material, 4
...... Conductive wire, 4 '... Conductive wire, 8 ... Heater cable

Claims (1)

[Scope of utility model registration request] 1. A plurality of heater cables 8 in which a heater wire 2 and at least one conductive wire 4 or 4'more than the heater wire 2 are housed in a metallic sheath 1 with an inorganic insulating material 3 interposed therebetween.
And the terminals 2a, 4a, 4a 'of the heater wire 2 and the conductive wires 4, 4'of the same heater cable 8 or another heater cable 8 provided at the ends of these heater cables 8.
A connector for a heater cable, comprising a terminal portion 7 for connecting 2b, 4b, 4b '.