JPS5840552Y2 - Sea heater - Google Patents

Description

[Detailed Description of the Invention] This invention relates to the structure of a sheathed heater, particularly the attachment of a name plate to its terminal portion.

As shown in FIG. 1, the conventional type connects the outlet terminal 2 of the sheathed heater 1 and the lead wire 4 via the connection terminal 3, and then inserts the rubber insulating cap 5 into the end of the sheathed heater 1. Then, the inside of the cap 5 is filled with an electrical insulating material 6 such as an adhesive, and the end of the sheathed heater 1 and the outlet terminal 2/connection terminal 3 are connected to each other.
A part of the lead wire 4 is buried and sealed, and a resin sheet or tape-shaped name plate 7 with adhesive is attached to the back side of the sheathed heater 1 rating, manufacturing date, etc. on the outer surface of the insulating cap 5. It is pasted on the .

The insulating cap 5 is generally made by molding using a mold, but in order to easily separate the cap 5 from the mold after molding is completed,
Processing is performed by applying a mold release agent to the mold.

Therefore, the mold release material remains attached to the surface of the molded insulating cap 5, and even if the name plate 7 with adhesive is pasted on the outer surface of the cap 5, good adhesion cannot be obtained. There was an inconvenience that the mold release material adhering to the surface of the mold had to be removed, and this work was troublesome.

In addition, when the temperature of the insulating cap 5 increases due to energization of the sheathed heater 1, or when the ambient temperature is high, the adhesive strength of the name plate 7 decreases due to the temperature rise, and this heat cycle eventually causes the name plate to become damaged. 7 has come to peel off, and when it is used in combination with a vibration system, this problem is further exacerbated.

However, the insulating cap 5 has a drawback of being susceptible to external shocks.

This invention attempts to eliminate such conventional drawbacks by providing a recess on the outer surface of the cap 5 and fitting a metal name plate into the recess.

This invention will be described in detail below based on illustrated embodiments. In FIGS. 2 to 4, 1 is a sheathed heater, 2 is an outlet terminal led out from the end thereof, and 3 is this outlet terminal and a lead wire. 5 is a connecting terminal for electrically fixing 4 and 5, and 5 is a rubber insulating cap with one end open and having an annular recess 5a on its outer peripheral surface and an insertion hole 5b with a diameter slightly smaller than the outer diameter of the sheathed heater 1 on its bottom surface. It is held at the end of the sheathed heater 1 by its elastic force through the insertion hole 5b.

Reference numeral 6 denotes an adhesive insulator having good electrical insulation properties, such as epoxy resin, etc., which is filled inside the cap 5 and protects the ends of the sheathed heater 1, the connection terminals 3, and part of the lead wires 4. Buried and sealed.

Reference numeral 7 denotes a metal ring-shaped name plate attached to the recess 5a of the cap 5, and the rating and manufacturing date are displayed on the surface thereof.

However, this name plate 7 is in advance the fourth part 5 of the cap 5.
It is fitted into a by taking advantage of its elasticity.

That is, the insulating cap 5 is hollow inside.
In addition, since it has elasticity and can freely change its shape, even a ring-shaped name plate 7 can be easily inserted.

After attaching the cap 5 to the end of the sheathed heater 1 in this way, if the insulator 6 is filled and hardened, the ring-shaped name plate 7 cannot be attached or detached from the recess 5a of the rubber cap 5, so Even if vibrations are applied or the temperature rises, it will not peel or fall off, and there is no need to remove the mold release agent adhering to the surface of the cap 5 as in the past, making the work easier. It is something.

Note that the name plate 7 does not have to be circular, but may have a partially open portion 7a as shown in FIG. 5, as long as it is not easily deformed.

In addition, the metal plate 7 can cope with external shocks applied to the outer periphery of the insulating cap 5, and is strong in strength, especially when the plate is large enough to be located on almost the entire surface of the cap 5 as shown in FIG. This will make it more resistant to external shocks.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the conventional one, Figures 2 to 6 are examples of this invention, Figure 2 is its cross-sectional view, Figure 3 is a cross-sectional view of the insulating cap, and Figure 4 is a cross-sectional view of the insulating cap. The figure is a perspective view of the name plate.
FIG. 5 is a perspective view showing another embodiment of the name plate, and FIG. 6 is a sectional view showing another embodiment of this invention. In the figure, 2 is an outlet terminal, 5 is an insulating cap, 5a is a recess,
5b is an insertion hole, 6 is an insulator, and 7 is a name plate.

Claims (1)

[Scope of utility model registration request] In the sheathed heater, an insulating cap is inserted around the outer periphery of the connection between the eyeliner and the lead wire of the sheathed heater, and the cap is filled with an insulating material such as resin to seal the connection. A sheathed heater characterized in that a ring-shaped recess along the circumferential direction is provided on the outer peripheral surface of the insulating cap, and a metal name plate is fitted into the recess.