JPS6240351Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an airtight terminal, and more particularly to an improvement in a type of airtight terminal in which a lead wire and an external circuit are connected by a socket.

An airtight terminal for a compressor of a room cooler or a refrigerator has a structure shown in FIGS. 1 and 2. In the figure, 1 is a metal outer ring, with an annular part 2 and a top plate part 3.
It has a flange portion 4 for welding, and three cylindrical portions 5 projecting inward from the annular portion 2 from the top plate portion 3. A lead wire 7 is hermetically sealed to each cylindrical portion 5 through a glass 6 while being insulated from the metal outer ring 1. This type of airtight terminal is used for air conditioners and high-power refrigerators by welding terminal plates (not shown) to both ends of the lead wire 7.
Conductive wires from the compressor main body and conductive wires from an external circuit are resistance welded to each of these terminal plates. On the other hand, airtight terminals for low-power refrigerators employ a method in which a socket is inserted into the lead wire 7 to connect to an external circuit.

By the way, if the tip of the lead wire 7 is angular, it will be difficult to insert the socket into the lead wire 7, so the lead wire 7 is tumbled before being sealed with glass, as shown in Fig. 3. , lead wire 7
A chamfered portion 7a is formed at the tip of the holder. However, even if the chamfered portion 7a is formed by tumbling, the flat surface 7b remains on the distal end surface, so that the insertability of the socket cannot be significantly improved. In addition, if the tip of the lead wire 7 is made into a hemispherical surface 7c as shown in FIG. 4 by performing the tumbling process for a long time, the diameter of the lead wire 7 will be drastically reduced, and the starting material will be considerably thick. This had the disadvantage of requiring the use of other materials, resulting in high costs.

Therefore, the main purpose of this invention is to provide an airtight terminal that allows easy insertion of a socket into a lead wire.

To summarize, this idea can be summarized as follows:
It is characterized by being formed into a chamfered inclined surface at a predetermined angle with respect to a plane perpendicular to its axis.

Hereinafter, embodiments of this invention will be described with reference to the drawings.

FIG. 5 shows an enlarged sectional view of the tip of the lead wire 70, which is the main part of the airtight terminal of this invention. The tip of the lead wire 70 has an angle θ of 30 to 5 with respect to the horizontal plane A, that is, a plane perpendicular to the axis of the lead wire 70.
It has an inclined surface 71 and a chamfered portion 72 of about .
When cutting a long wire, such a lead wire 70 may be cut at the angle θ with respect to the axis of the wire, and then subjected to a normal tumbling process.

In the airtight terminal of this invention in which the lead wire 70 is sealed with glass, the socket can be inserted with approximately 20% less force than the airtight terminal having the lead wire 7 shown in FIG. In addition, the lead 7 shown in FIG.
As mentioned above, the ends are processed into a curved surface by tumbling for a long time, so if the finished diameter of the lead wire is 2.3 mmφ, the starting material should be While the diameter must be 2.6 to 2.7 mmφ,
Based on this consideration, the lead wire 70 shown in FIG. 5 only needs to be tumbled for a short time and is less thinned by the tumbling process, so the diameter of the starting material is 2.4 mmφ for the same finished diameter As a result, the cost can be reduced by reducing the material cost due to the reduction in the amount of material used and the processing cost due to the reduction in the tumbling processing time.

As described above, in this invention, since the tip of the lead wire is formed into a chamfered inclined surface, the socket can be easily inserted and the connection work can be performed quickly and reliably.

[Brief explanation of the drawing]

Figure 1 is a plan view of an airtight terminal for a compressor, Figure 2 is a sectional view taken along the - line in Figure 1, Figures 3 and 4 are enlarged sectional views of main parts of a conventional airtight terminal, and Figure 5. 1 is an enlarged sectional view of a main part of the airtight terminal of this invention. 1... Metal outer ring, 6... Glass, 70... Lead wire, 71... Inclined surface.

Claims (1)

[Claims for Utility Model Registration] In an airtight terminal in which a lead wire is hermetically and insulated sealed inside a metal outer ring through glass, the tip of the lead wire is placed in a plane perpendicular to its axis. An airtight terminal characterized in that it is formed on a chamfered inclined surface at a predetermined angle.