JP3732097B2 - Terminal block with thermal fuse connection contact - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention has a contact structure provided on a terminal block for connecting a power source to an air conditioner such as a room air conditioner for connecting a lead wire of a thermal fuse for detecting abnormal heat generation at a connection portion to a circuit board and the contact. Regarding terminal blocks.
[0002]
[Prior art]
In an air conditioner such as a room air conditioner, a terminal block for connecting the power supply of the outdoor unit and the indoor unit is provided, and a temperature fuse is provided to protect the internal circuit by detecting heat generation due to an abnormality in the power connection part. It is attached to this terminal block.
And 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 risk of the thermal fuse operating and fusing by the heat at the time of soldering In order to prevent this, conventionally, a method as shown in FIG. 4 has been adopted.
4A is a plan view of an example of a conventional terminal block, FIG. 4B is a side view thereof, FIG. 4C is a cross-sectional view of a thermal fuse terminal block mounting section (AA cross-sectional view), and FIG. ) Shows a cross-sectional view (BB cross-sectional view) of the power supply wire connecting portion of the terminal block.
The power supply wire 4 is inserted into the wire insertion holes 112a and 112b of the terminal block 100, and is sandwiched by the spring member 113 so as to be connected to the circuit board 6 via the circuit board connection terminal 114 by soldering 115.
In addition, the release button 111 is pressed when the electric wire is removed. When a power supply wire connection failure occurs, the connecting portion generates heat, and in order to detect this and disconnect the circuit, a thermal fuse 2 is attached to the terminal block as shown in FIG. The lead wires 21 a and 21 b are connected to the connector 22, and the connector 22 is inserted and connected to the connector pins 51 of the pair of connectors 5 soldered to the circuit board 6 in advance.
[0003]
However, in such a conventional structure, a connector terminal is crimped to the lead wire of the thermal fuse, the connector terminal is inserted and connected to the connector housing, and on the other hand, the connector paired with the connector is soldered to the circuit board. It requires a lot of work processes and parts to attach and fit both connectors, and the lead wire part is in the air in the distribution process until the terminal block is attached to the circuit board. In addition, there is a risk of troubles such as the thermal fuse being removed by being caught.
[0004]
[Problems to be solved by the invention]
In view of the above-mentioned technical problems of the prior art, the present invention has a small number of components in the connection structure to the circuit board of the thermal fuse inserted and attached to the inside of the terminal block for detecting abnormal heat generation, and has excellent mounting workability. The purpose is to provide a terminal block with a thermal fuse connection contact.
[0005]
Specifically, the first purpose is to dissipate heat when soldering the connection of the thermal fuse to the circuit board and suppress the transmission to the thermal fuse, thereby providing the lead wire connection contact of the thermal fuse on the terminal block. The object is to provide a structure in which the pair of connectors 5 necessary for connecting to the board can be eliminated.
The second object is to provide a structure in which a thermal fuse lead wire can be directly inserted into and connected to a contact provided on a terminal block, and the conventional connector 22 of a thermal fuse can be eliminated.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 is a terminal block to which a power supply wire is connected and to which a thermal fuse is attached , and a heat dissipating contact for connecting the thermal fuse lead wire to the circuit board is inserted and connected to the thermal fuse lead wire. The heat dissipating contact includes a heat dissipating plate that dissipates heat so as to prevent heat from being transmitted to the pinching portion when the heat dissipating contact is soldered to the circuit board .
[0007]
Here, the heat dissipating contact is a contact made of a thin metal plate that increases the surface area, increases the radiant heat and heat conduction distance from the surface, and radiates heat during soldering. The heat at the time of soldering the wire to the circuit board through the heat dissipating contact can be dissipated by the heat dissipating contact, and the heat transfer to the thermal fuse is suppressed, and the malfunction of the thermal fuse is prevented.
[0008]
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 arranged to face each other, and at least one of the first heat dissipating plate or the second heat dissipating plate is made of an elastic body. And the lead wire of the thermal fuse is sandwiched between the first and second heat radiating plates.
In this case, the sandwiching portion made of an elastic body may be provided integrally with the heat radiating plate, or a separate body may be joined.
Further, it is desirable to provide a holding recess so that the insertion of the lead wire is surely guided and does not shift in the holding portion.
Here, the first heat radiating plate and the second heat radiating plate are metal plates having a large surface area, and there are various conceivable methods for making them face each other in a structure in which the side portions of the two heat radiating plates are connected in a U-shape. Then, it can be integrally formed by pressing or the like, and heat can be emitted from the surface of the connecting portion.
Since the first heat radiating plate and the second heat radiating plate having a large surface area are arranged so as to face each other, and the sandwiching portion made of an elastic body is provided on at least one of the first heat radiating plate or the second heat radiating plate, The lead wire can be inserted and connected directly to the holding portion of the contact, and the surface area of the contact can be further increased at the holding portion.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
An embodiment of a terminal block according to the present invention is shown in FIG. 1, (A) is a plan view, (B) is a side view, and (C) is a cross-sectional view (CC cross-sectional view) of a heat dissipation contact portion. .
The terminal block case 10 is made of resin, and the power supply wires are inserted into the wire insertion holes 12a and 12b provided in the terminal block case, and when removing, the release button 11 is pressed. It is the same.
The lead wires 21a and 21b of the thermal fuse 2 inserted and attached to the inside of the terminal block are contacts 30a provided in contact arrangement recesses 13a and 13b provided in the terminal block case 10 as shown in FIG. , 30b are inserted and connected via lead wire insertion holes 14a, 14b of the terminal block case.
[0010]
This contact 30 (30a, 30b) is formed of a thin metal plate having a large surface area such as white and white, and an enlarged perspective view thereof is shown in FIG. 2, where (a) in FIG. 3 is a front view and (b) is on the left side. A side view, (C) is a right side view, and (D) is a plan view.
Western white has high heat conductivity and excellent heat dissipation, and the first heat sink 31 and the second heat sink 32 for securing a surface area with this metal plate are formed into a U-shape by a press or the like at the connecting portion 34. A joint 35 to the circuit board 6 is provided below the connecting portion 34.
The upper part of the second heat radiating plate has a U-shaped folded holding portion 33, and the lead wire of the thermal fuse is held between the first heat radiating plate and the holding portion.
In addition, the holding portion is provided with a holding recess 331 for reliably guiding the lead wire and preventing the shift, and the side of the heat sink is engaged and fixed to the side wall of the contact mounting recess of the terminal block. Protrusions 311, 312, 321, 322 are provided.
[0011]
Next, the process of attaching the terminal block to the circuit board will be described. The contacts 30a and 30b are fitted and fixed from the lower side to the contact arrangement recesses 13a and 13b of the terminal block case 10, and the thermal fuse 2 is inserted into the terminal block case. Mounting The lead wires 21a and 21b are inserted from the lead wire insertion holes 14a and 14b of the terminal block case, and are inserted and connected to the contact holding portions.
In such a state, the circuit board 6 and the contact bonding portions 35a and 35b are soldered to the next circuit board attachment process or distribution process.
Even when the lead wire of the thermal fuse is connected to the contact, the heat at the time of soldering is dissipated by the heat radiating plate of the contact, thereby preventing the thermal fuse from fusing.
[0012]
【The invention's effect】
In the present invention, since the contact for connecting the lead wire of the thermal fuse attached to the terminal block to the circuit board is provided in this terminal block, the lead wire for connecting the thermal fuse that has been separately attached to the conventional circuit board is provided. Connector parts and their attachment processes can be reduced.
In addition, since the heat dissipating contact is made of a heat dissipating plate, the terminal block can be transported to the next process and soldered to the circuit board while the lead wire of the thermal fuse is directly connected to the contact.
[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, FIG. 3B is a left side view, FIG. 3C is a right side view, and FIG. 3D is a plan view.
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 Electric wire insertion hole 13a, 13b Contact arrangement | positioning recessed part 14a, 14b Lead wire insertion hole 2 Thermal fuse 21a, 21b Lead wire 30 (30a, 30b) Contact 31 1st heat sink 32 2nd heat sink 33 Clamping part 34 Connection part 35 (35a, 35b) Joint part 311, 312, 321, 322 Projection part 4 Power supply wire 5 Pair of connector 6 Circuit board

Claims (2)

The power cable is connected, a terminal block for mounting a thermal fuse, comprising providing a clamping unit for heat dissipation contact inserting connecting leads of the temperature fuse for connecting the lead wires of the thermal fuse on a circuit board, heat dissipation The conductive contact has a heat radiating plate that radiates heat so as to prevent heat from being transferred to the clamping portion when the heat radiating contact is soldered to the circuit board . The heat radiating plate is disposed so that the first heat radiating plate and the second heat radiating plate are opposed to each other, and at least one of the first heat radiating plate or the second heat radiating plate is provided with a holding portion made of an elastic body. The terminal block according to claim 1, wherein the terminal block is a heat dissipating contact in which a lead wire of a thermal fuse is sandwiched between heat dissipating plates.

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