JPH08222448A - Mold transformer - Google Patents

Abstract

PURPOSE: To provide a mold transformer with a lead wire in which a terminal is connected firmly with an outer lead wire to enhance the running strength of the outer lead wire and which is excellent in water-proofness and reliability, in a terminal type transformer applicable for various kinds of electronic devices. CONSTITUTION: A peripheral tip end projecting part 37 and insulation bulkhead projecting part 38 of an insulation case 24 made of thermoplastic resin to which the tip end of an outer lead wire 29 is connected electrically and mechanically are engaged with a joint edge recessed part 28 and slot recessed part 39 of a terminal preparation part of a terminal case 22, respectively. They are subjected to be jointed with each other through ultrasonic deposition thereafter. Thus, a mold transformer whose strength water-proofness and reliability are improved can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold transformer in which a terminal case of a terminal body and an insulating case holding an external lead wire are molded with a thermoplastic resin, fitted and ultrasonically welded.

[0002]

2. Description of the Related Art In recent years, in order to rationalize the production process of transformers, the automation of winding and finishing processes has been promoted. As a result, the external lead wire drawing structure is basically of the terminal type, and a connector with an external lead wire is connected. The configuration is increasing.

In this case, the connection strength becomes a problem, and there is concern about reliability such as the external lead wire being pulled out or being dislocated due to vibration during transportation. For example, the user had to install the internal wiring at the same time, which limited the flexibility of the user in terms of procurement.

[0004] Further, in a transformer used for a water-operated machine such as an electric washing machine, a need for waterproofing between connection portions with external lead wires is increasing year by year, and a structure adapted to this is required.

The conventional transformer will be described below.
5 to 8 show the structure of a conventional transformer.
5 to 8, reference numeral 1 denotes a transformer including a transformer case 2 formed of a synthetic resin that houses a transformer body, and a bottom portion 3 of the transformer case 2 has several holes 5 through which a terminal 4 penetrates and an insulating case. A fitting hole 8 for fitting with a fitting claw 7 provided on the outer side surface of 6 is also provided adjacent to the hole 5. Further, on the side surface of the transformer case 2, there is provided a projection 10 having a mounting hole 9 for mounting on a device.

Reference numeral 11 denotes an external lead wire, which is electrically and mechanically connected to the core wire 12 at the tip of the external lead wire 11, and which also holds the insulating coating 13 of the external lead wire 11 mechanically. A cylindrical contact piece 17 having a contact piece 15 on the other side and a fixing claw 16 fixed to the insulating case 6 on the side surface is attached to the insulating case 6 made of synthetic resin.

The external lead wire 11 and the insulating case 6 are fixed by the recess 18 provided inside the insulating case 6 and the fixing claw 16 of the cylindrical contact piece 17, and the insulating case 6 and the transformer case 2 are fixed by the insulating case. It is fixed by the fitting claw 7 of 6 and the fitting hole 8 provided in the transformer case 2.

The insulating distance between each terminal 4 and the cylindrical contact piece 17 is secured by the insulating piece 19, and the fitting claw 7 of the insulating case 6 projects in an L-shape and is fixed in the fitting hole 8. It is configured to bend in the direction C and apply a force in the direction D when the fitting claw 7 is fitted.

It should be noted that even if the surface of the terminal 4 has irregularities, or if flux or foreign matter due to soldering is adhered, the contact piece 15 is mechanically removed when the contact piece 15 is inserted, and the contact piece 15 is connected so that it can be connected. It has rigidity.

[0010]

However, in the above-mentioned conventional structure, first, as shown in FIG.
The transformer case 2 and the transformer case 2 are made of synthetic resin, and the fixing means requires a clearance E between the L-shaped fitting claw 7 and the fitting hole 8. 7mm or more is required. In particular, nylon resin is soft, and due to the structural rattling factor, the first, second, and third tensile strength tests with respect to the external lead wire 11 in the F direction and the bending strength test in the G direction perpendicular to the external lead wire 11 are performed.
There was a problem that it became weaker as it repeated the number of times and became less than 10 N and eventually came off. Further, in the case of nylon resin, there is a drawback that the strength after the moisture resistance test is very weak.

Further, as shown in FIG. 8, each terminal 4
The space between the cylindrical contact piece 17 and the cylindrical contact piece 17 is partitioned by an insulating piece 19, but a minute gap 20 between the insulating piece 19 and the transformer case 2 is provided.
However, when the insulating case 6 is exposed to water, it invades through the gaps 20, and the insulating performance between the terminals 4 and the cylindrical contact pieces 17 deteriorates, which is a structural defect.

Further, when packaging the transformer, it is necessary to route the external lead wire 11. However, due to the above-mentioned factors, it is necessary to handle with care so as not to attach or detach due to transportation vibration or the like.

As described above, the conventional transformer has a problem in that it is inferior in quality, reliability, waterproofness, work efficiency, and procuring ability.

The present invention solves the above-mentioned conventional problems. It is based on a terminal type transformer, connects a terminal and an external lead wire, and has a strong wiring strength of the external lead wire, and is highly waterproof. The purpose of the present invention is to provide a mold transformer having high reliability and reliability.

[0015]

In order to achieve this object, the molded transformer of the present invention is molded with a thermoplastic synthetic resin so that the terminal case of the transformer body is exposed only to the external lead wire. A tubular contact piece electrically and mechanically connected and connected to the terminal at the tip is stored and held by the number of the terminals,
An insulating case is provided between the terminals and the cylindrical contact piece, and an insulating case formed of thermoplastic synthetic resin,
This insulating case has a configuration in which the protruding portion on the outer peripheral end is ultrasonically welded to the terminal planting portion of the terminal case that is fitted.

[0016]

With this structure, the insulating case, which is a merit of the transformer of the conventional structure, maintains the insulation distance between the terminal connection portions, and since the connection is made by the rigid cylindrical contact piece, the reliability against vibration is high, and the work can be performed. In terms of performance, the transformer body does not have lead wires, so it is easy to assemble, and while following the point that it is easy to automate production, when fixing the insulating case and terminal case, the outer peripheral protruding part of the insulating case and the insulating partition wall protruding part are fixed. , And the joint edge concave portion and the groove concave portion of the terminal case are formed of thermoplastic synthetic resins, so that they are firmly and instantaneously joined by ultrasonic welding, and the airtightness between each terminal and the cylindrical contact piece is improved. Is ensured, the tensile strength and bending strength of the external lead wires are enhanced, and the waterproofness and reliability can be improved.

[0017]

An embodiment of the present invention will be described below with reference to the drawings.

1 to 4, reference numeral 21 denotes a mold transformer formed by molding the terminal case 22 with a thermoplastic synthetic resin so as to expose only the terminal 23 planted in the terminal case 22 of the transformer body. On the outer circumference of the tip of the molded terminal implanting portion 27, a joint edge concave portion 28 fitted for ultrasonic welding with the outer peripheral tip convex portion 37 of the insulating case 24, and the insulating partition convex portion 38 and ultrasonic welding. Groove recess 39 for fitting
Is provided. In addition, the side surface of the terminal case 22 has a projection 2 having a mounting hole 25 for mounting to a device.
6 is provided.

Reference numeral 29 denotes an external lead wire, which is electrically and mechanically connected to the core wire 30 at the tip of the external lead wire 29, and which also holds the insulating coating 31 of the external lead wire 29 mechanically. A cylindrical contact piece 35 having a contact piece 33 on the other side and a fixing claw 34 fixed to the insulating case 24 on the side surface is attached to the insulating case 24 made of a thermoplastic synthetic resin.

The external lead wire 29 and the insulating case 24 are fixed by the recess 36 provided inside the insulating case 24 and the fixing claw 34 of the tubular contact piece 35, and the insulating case 24 and the terminal case 22 are fixed by insulation. Outer peripheral tip convex portion 37 of case 24, insulating partition convex portion 38 and terminal planting portion 27
The joint edge recess 28 and the groove recess 39 of the terminal 2
After fitting through 3 and the contact piece 33, they are ultrasonically welded and bonded and fixed, and even if the external lead wire 29 is drawn in the H direction and the I direction, it does not come off. Further, even if the surface of the terminal 23 has irregularities, or even if flux or foreign matter is attached by the soldering process, the contact piece 33 is mechanically removed when it is inserted and has rigidity so that it can be connected. Is configured.

As described above, according to the present embodiment, the insulation between each terminal 23 and the cylindrical contact piece 35 is secured by the insulating partition 40, and the insulating partition projection 38 and the groove recess 39 are ultrasonically welded to each other. Since it is completely airtight, even if water is splashed on the insulating case 24, it is possible to prevent water from entering and maintain the insulating property and the waterproof property.

The material of the thermoplastic synthetic resin for molding the terminal case 22 and the material of the thermoplastic synthetic resin of the insulating case 24 are preferably the same, but it is not limited to this as long as it has excellent ultrasonic weldability. Generally, glass-reinforced grades such as PBT resin, PET resin, and 66 nylon resin are suitable because they have excellent ultrasonic weldability and high heat resistance.

[0023]

As described above, according to the present invention, the insulating partition wall and the ultrasonic welding welding of the insulating partition wall convex portion and the groove concave portion
It keeps the insulation and airtightness between the terminal and the connection part stable, and is highly waterproof. In addition, the transformer is easy to manufacture automatically, the external lead wire can be easily connected, the transport vibration and the tensile strength of the external lead wire are strong, and they are not attached or detached even if they are pulled around. Can be connected and delivered to users. Further, by molding the transformer body, it is possible to realize a molded transformer which is excellent in heat dissipation, high safety, quality, reliability, and low cost and high performance.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a mold transformer according to an embodiment of the present invention.

FIG. 2 is a perspective view of a completed molded transformer according to an embodiment of the present invention.

FIG. 3 is a sectional view taken along line JJ ′ of FIG.

FIG. 4 is a sectional view taken along the line KK ′ of FIG.

FIG. 5 is an exploded perspective view of a conventional transformer

FIG. 6 is a perspective view of a finished product of a conventional transformer.

7 is a sectional view taken along the line AA ′ of FIG.

8 is a sectional view taken along line BB ′ of FIG.

[Explanation of symbols]

 22 Terminal Case 23 Terminal 24 Insulation Case 27 Terminal Implantation Part 28 Joining Edge Recess 29 External Lead Wire 35 Cylindrical Contact Piece 37 Outer Peripheral Tip Convex 38 Insulating Partition Convex 39 Groove Recess 40 Insulating Partition

Claims (1)

[Claims] 1. A cylinder which is molded with a thermoplastic synthetic resin so as to expose only a terminal case of a transformer body, is electrically and mechanically connected to an external lead wire, and is connected to the terminal at a tip portion thereof. -Shaped contact pieces are stored and held by the number of the terminals, and the outer peripheral tip projections of the insulating case and the insulation partition projections are formed of a thermoplastic synthetic resin in which an insulation partition is provided between the terminals and the cylindrical contact pieces. A mold transformer in which an ultrasonic welding connection is made by fitting a groove and a groove on the outer periphery of the tip of the terminal planting part of the terminal case.