JP2002246081A - Terminal block with temperature fuse connection contact - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal block with temperature fuse connection contacts having a small number of components and superior in mounting workability, in a connection structure to a circuit board of a temperature fuse inserted and mounted in the terminal block for detecting abnormal heat generation. SOLUTION: The contacts for jointing the lead wires of the temperature fuse, mounted to the terminal block for connecting power wires to the circuit board are formed on the terminal block, the contacts are disposed to have a first radiating plate and a second radiating plate, each having a large surface area, to face each other, and a catching part formed of an elastic body is attached to at least either the first radiating plate or the first radiating plate. Thereby, the radiating plates prevent transmission of heat to the temperature fuse at soldering, the contacts can be soldered to the circuit board, while keeping the lead wires of the temperature fuse connected directly to the contacts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention connects a lead wire of a thermal fuse provided on a terminal block for connecting a power supply to an air conditioner such as a room air conditioner for detecting abnormal heat generation at a connection portion to a circuit board. The present invention relates to a contact structure and a terminal block having the contact.

[0002]

2. Description of the Related Art In an air conditioner such as a room air conditioner, a terminal block for connecting a power supply of an outdoor unit and an indoor unit is provided. For this purpose, a thermal fuse is attached to this terminal block. Then, it is necessary to connect this thermal fuse to the circuit board via the lead wire, but if you try to solder the thermal fuse lead wire directly to the circuit board, there is a danger that the thermal fuse will operate due to the heat during soldering and blow out Conventionally, a method as shown in FIG. 4 has been adopted to prevent this. 4A shows a plan view of an example of a conventional terminal block, FIG. 4B shows a side view thereof, and FIG.
Is a cross-sectional view (AA cross section) of a terminal block mounting portion of a thermal fuse, and (d) is a cross-sectional view of a power supply wire connecting portion of a terminal block (BB
(Cross-sectional view). The power supply wire 4 is inserted into the wire insertion holes 112a and 112b of the terminal block 100, and the spring member 11
3 and connected to the circuit board 6 via the circuit board connection terminals 114 by soldering 115. Further, when the electric wire is removed, the release button 111 is pressed. When a power supply wire connection failure occurs, the connection portion generates heat, and a thermal fuse 2 is attached to the terminal block as shown in FIG. Lead wires 21a, 21
b is connected to the connector 22, and the connector 22 is inserted and connected to the connector pins 51 of the pair of connectors 5 which are soldered to the circuit board 6 in advance.

However, in such a conventional structure, a connector terminal is crimped to a lead wire of a thermal fuse, and the connector terminal is inserted and connected to a connector housing. On the other hand, a connector which is paired with the connector is mounted on a circuit board. It requires many work steps and parts to attach these connectors with solder, and the lead wire partly floats in the distribution process until the terminal block is attached to the circuit board. As a result, there is also a risk of occurrence of troubles such as a thermal fuse or the like coming off.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned technical problems of the prior art, the present invention relates to a structure for connecting a thermal fuse, which is inserted and mounted inside a terminal block for detecting abnormal heat generation, to a circuit board. It is an object of the present invention to provide a terminal block with a thermal fuse connection contact, which has a small number of pieces and is excellent in workability of mounting.

Specifically, the first object is to dissipate heat at the time of soldering the connection of the thermal fuse to the circuit board to suppress transmission to the thermal fuse, thereby connecting the lead wire connection contact of the thermal fuse to the terminal block. It is an object of the present invention to provide a structure in which a pair of connectors 5 which is conventionally required for connecting to a circuit board can be eliminated. A second object is to provide a structure in which a lead wire of a thermal fuse can be directly inserted into and connected to a contact provided on a terminal block, and the conventional connector 22 of the thermal fuse can be eliminated.

[0006]

According to the first aspect of the present invention,
A heat dissipating contact for connecting a lead wire of a thermal fuse inserted and attached to a terminal block for connecting a power supply wire to a circuit board is disposed on the terminal block.

Here, the heat-dissipating contact means a contact made of a thin metal plate that radiates heat during soldering by increasing the surface area to increase the radiant heat and the heat conduction distance from the surface. The heat generated when soldering the fuse lead wire to the circuit board via this heat-dissipating contact can be dissipated by the heat-dissipating contact. I do.

According to a second aspect of the present invention, in the structure of the heat dissipating contact, the first heat dissipating plate and the second heat dissipating plate are disposed to face each other, and at least one of the first heat dissipating plate and the second heat dissipating plate is made of an elastic material. The first and second radiating plates are provided to hold the lead wire of the thermal fuse. In this case, the holding portion made of an elastic body may be provided integrally with the heat sink, or may be joined separately. In addition, it is desirable to provide a holding concave portion in the holding portion for surely guiding the insertion of the lead wire so as not to shift. Here, the first radiator plate and the second radiator plate refer to metal plates having a large surface area, and various methods for facing these are considered as a structure in which the side portions of the two radiator plates are connected in a U-shape. Then, it can be formed integrally by press working or the like, and can also radiate heat from the surface of the connecting portion. Since the first radiator plate and the second radiator plate having a large surface area are disposed to face each other, and at least one of the first radiator plate and the second radiator plate is provided with a holding portion made of an elastic body, the temperature of the thermal fuse is reduced. It acts so that the lead wire can be directly inserted and connected to the holding portion of the contact, and the surface area of the contact can be further increased at the holding portion.

[0009]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an embodiment of a terminal block according to the present invention, in which (a) is a plan view, (b) is a side view, and (c) is a cross-sectional view of a heat-dissipating contact portion (CC).
FIG. The terminal block case 10 is made of resin, and the power supply wires are connected to wire insertion holes 12a, 12a provided in the terminal block case.
In order to be inserted into b and to be removed, the release button 11 is pressed, but the structure is the same as that described in the conventional example. Thermal fuse 2 inserted inside terminal block
The lead wires 21a and 21b of the contact mounting recess 13 provided in the terminal block case 10 as shown in FIG.
The terminals 30a and 30b are inserted and connected to the upper portions of the contacts 30a and 30b through lead wire insertion holes 14a and 14b of the terminal block case.

The contacts 30 (30a, 30b) are made of a thin metal plate having a large surface area, such as nickel silver.
FIG. 2 is an enlarged perspective view of FIG. 2, and FIG.
(B) is a left side view, (c) is a right side view, and (d) is a plan view. Nickel white has high heat conductivity and excellent heat dissipation, and the first heat sink 31 and the second heat sink 31 for securing the surface area with this metal plate are used.
The heat radiating plate 32 is formed in a U-shape by a press or the like at the connecting portion 34, and a joint 35 to the circuit board 6 is provided below the connecting portion 34. The upper portion of the second heat sink has a U-shaped folded holding portion 33, and the first heat sink and the holding portion hold the lead wire of the thermal fuse. Further, the holding portion is provided with a holding recess 331 for reliably guiding the lead wire and preventing the lead wire from being displaced, and a side portion of the heat sink is provided for engaging and fixing to a side wall of the contact arrangement recess of the terminal block. Protrusions 311, 312, 321, and 322 are provided.

Next, the step of attaching the terminal block to the circuit board will be described.
The contacts 30a, 30b are fitted and fixed to the terminals 3a, 13b from below, the temperature fuse 2 is inserted into the terminal block case, and the leads 21a, 21b are inserted from the lead wire insertion holes 14a, 14b of the terminal block case. Insert and connect to the holding part. In such a state, a mounting process or a distribution process to the next circuit board is performed, and the circuit board 6 is soldered to the contact bonding portions 35a and 35b. Even when the lead wire of the thermal fuse is connected to the contact, the heat at the time of soldering is radiated by the heat radiating plate of the contact, thereby preventing the thermal fuse from blowing.

[0012]

According to the present invention, the contact for connecting the lead wire of the thermal fuse attached to the terminal block to the circuit board is provided on the terminal board. It is possible to reduce the number of connector components for connecting lead wires and the process of mounting the same. In addition, since the heat-dissipating contact formed of the heat-dissipating plate is used, the terminal block can be transported to the next step while the lead wire of the thermal fuse is directly connected to the contact, and can be soldered to the circuit board.

[Brief description of the drawings]

FIG. 1 shows a terminal block according to the present invention.

FIG. 2 shows a perspective view of a contact.

3A is a front view of the contact, FIG. 3B is a left side view of the contact, FIG.
(C) A right side view and (d) a plan view are shown.

FIG. 4 shows an example of a conventional terminal block.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Terminal block 10 Terminal block case 11 Release button 12a, 12b Wire insertion hole 13a, 13b Contact arrangement concave part 14a, 14b Lead wire insertion hole 2 Thermal fuse 21a, 21b Lead wire 30 (30a, 30b) Contact 31 First heat sink Reference Signs List 32 second heat sink 33 holding portion 34 connecting portion 35 (35a, 35b) joining portion 311, 312, 321, 322 projecting portion 4 power supply wire 5 pair of connectors 6 circuit board

Claims (2)

[Claims] 1. A terminal block, wherein a heat-dissipating contact for connecting a lead wire of a thermal fuse attached to a terminal block to which a power supply wire is connected to a circuit board is provided on the terminal block. 2. A first heat radiating plate and a second heat radiating plate are provided to face each other, and a holding portion made of an elastic body is provided on at least one of the first heat radiating plate and the first heat radiating plate. 2. The terminal block according to claim 1, wherein the terminal board is a heat-dissipating contact in which a lead wire of a thermal fuse is sandwiched between heat-dissipating plates.