JPH10209654A - Thermal fuse mounting member for terminal board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely blow a thermal fuse by enhancing the adhesion to a terminal board ribs by a thermal fuse mounting tool, thereby directly contacting the fuse to the ribs. SOLUTION: Using a thermal fuse mounting tool 7, a thermal 3 is contacted to terminal board ribs 1a such that the fuse 3 and electric wires 4 are laminated so that the fuse 3 is disposed below the ribs 1a and wires 4 are disposed below it and placed so that the ribs 1a slightly depresses the fuse 3 and the coats of the wires 4 connected to the fuse 3 are elastically deformed to absorb the depression shift. The fuse is directly contacted to the ribs 1a of raise the adhesion of the joints of the fuse 3 and wires 4. This improves the heat transfer response of the fuse 3 and surely blows the fuse 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw type terminal block with a temperature fuse for detecting abnormal heat generation at a connection portion of a screw type terminal block used in an air conditioner.

[0002]

2. Description of the Related Art For example, a conventional thermal fuse is conventionally mounted on a screw type terminal block as shown in FIG.

In FIG. 7, a resin cover 2 and the like are provided at the bottom of a terminal block 1, and a lead 3 a of the thermal fuse 3 is press-fitted into a rib 2 a provided on the resin cover 2 and the electric wire 4 is inserted into the electric wire 4. The ambient temperature rises due to abnormal heat generation at the connection portion of the terminal block 1, and the raised air is trapped between the terminal block 1 and the resin cover 2 by the resin cover 2. Eventually thermal fuse 3
Fusing operation. On the other hand, the screw-type terminal block has a large space in the upper and lower parts due to the tightening stroke of the screw 5, and the tightening screw 5 and the connection terminal 6 are charged metal parts. Therefore, depending on the necessity of ensuring insulation from the thermal fuse 3, it is necessary to separate the mounting portion of the thermal fuse 3 from the screw 5 or the connection terminal 6 or to interpose an insulator.

[0004]

In the above-mentioned conventional configuration,
In order to ensure insulation between the thermal fuse and the abnormal heat generating portion, an insulating space distance is required. However, the heat transfer to the thermal fuse 3 is poor due to the spatial distance, and the thermal response is poor. It is necessary to lower the temperature setting of the thermal fuse 3 or use a small-sized product having good thermal response of the thermal fuse 3 itself. In addition, small-sized thermal fuses 3 are limited in voltage rating and breaking current rating during operation, and usable thermal fuses may be limited, so that it is difficult to apply to a power supply circuit of an air conditioner. Was.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and when an abnormal heat generation occurs due to connection instability or the like at a connection portion of a terminal block, the thermal fuse is more reliably blown. An object of the present invention is to realize a mounting device for a thermal fuse.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a thermal fuse mounting device which enables a thermal fuse to directly contact a terminal block rib, and a terminal block comprising the thermal fuse mounting device. By increasing the adhesion to the ribs, the heat transfer to the thermal fuse is improved, and when the terminal block generates abnormal heat, the temperature is more reliably detected and the operation is performed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is a method of connecting a temperature fuse, in which the temperature sensing portion of the temperature fuse is electrically insulated by a resin case or the like, to a terminal rib provided for insulating between poles. A groove for mating is provided, and the thermal fuse is made of resin so that the thermal fuse contacts the terminal block rib at the groove. The thermal responsiveness can be improved by being heated, so that the set temperature of the thermal fuse can be increased, and the structurally larger thermal fuse can be selected. This allows the use of larger capacitances in the more relevant thermal fuses.

According to a second aspect of the present invention, there is provided the thermal fuse mounting device according to the first aspect, wherein the thermal fuse and the electric wire are vertically overlapped with each other by using the thermal fuse as a means for contacting the terminal block rib. To the rib side, the electric wire is placed under it, and the thermal fuse is positioned slightly downward by the terminal block rib, and the dimension that is held down is determined by utilizing the elastic deformation of the sheath of the electric wire connected to the thermal fuse. It absorbs the heat so that the thermal fuse contacts the terminal block rib. Thereby, the heat transfer response of the thermal fuse is improved by improving the adhesion of the fitting portion.

According to a third aspect of the present invention, in the thermal fuse mounting according to the first or second aspect, after inserting the thermal fuse into the thermal fuse mounting, the thermal fuse is prevented from coming off and the mounting position is fixed. A protrusion is provided inside the thermal fuse attachment so that the case end of the thermal fuse outer part is inserted to a predetermined position, and the thermal fuse is not easily removed by the protrusion when it exceeds the provided protrusion. In this way, workability and fixing reliability are improved.

According to a fourth aspect of the present invention, in the thermal fuse mounting according to any one of the first to third aspects, a rib between leads for insulating a lead portion of the thermal fuse is provided inside the thermal fuse mounting. By setting the length to be applied, the insertion position of the thermal fuse can be reliably positioned to a predetermined position, thereby improving workability and fixing reliability.

According to a fifth aspect of the present invention, there is provided the thermal fuse mounting according to any one of the first to fourth aspects, wherein the thermal fuse is provided inside the thermal fuse mounting as joining means for bonding the thermal fuse to the terminal block rib. A thermal fuse holding piece having elasticity molded at the same time as the fixture is provided, and the thermal fuse inserted into the thermal fuse fitting is joined to the terminal block rib by the elasticity of the thermal fuse holding piece. This improves the adhesion between the thermal fuse and the terminal block ribs and improves the heat transfer response.

According to a sixth aspect of the present invention, a step is provided on the elastic thermal fuse holding piece provided inside the thermal fuse mounting according to the fifth aspect, and the thermal fuse is inserted to a predetermined position. The step prevents the thermal fuse from easily coming off, thereby improving workability and fixing reliability.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. The same parts as those in the conventional example shown in FIG. 7 are denoted by the same reference numerals, and detailed description is omitted.

(Embodiment 1) In a screw type terminal block for connecting a power supply wire of an indoor unit of an air conditioner and an outdoor unit, a thermal fuse 3 having a lead portion 3a is shown in FIGS.
As shown in FIG. 7, the terminal block 1 is attached to the lower portion of the terminal block 1 by press fitting or the like by using a thermal fuse attachment 7. As shown in FIG. 3, the thermal fuse attachment 7 has a case 7 made of an electrically insulating resin or the like and has a groove 7g in which the thermal fuse 3 is partially exposed.

In FIG. 1, a temperature fuse 3 whose temperature sensing portion is electrically insulated by a resin case or the like is a terminal block provided to insulate between the connection terminals 6 of the screw type terminal block 1. 1 is exposed from a groove 7g fitted into the terminal block rib 1a.
By contacting a, heat is transferred from the terminal block 1 directly to the thermal fuse 3 at the same time as ensuring insulation to the thermal fuse 3. According to this embodiment, the thermal responsiveness to the thermal fuse 3 can be improved.
Can be set high, and malfunction due to an increase in the ambient temperature during transportation and storage can be prevented. In addition, since a structurally larger thermal fuse can be selected, a larger capacity can be used in the thermal fuse 3 having a large connection between the current interrupting capacity and the rated voltage.

Then, in the thermal fuse attachment 7, the thermal fuse 3 and the electric wire 4 are vertically overlapped as means for contacting the thermal fuse 3 with the terminal block rib 1a, and the thermal fuse 3 is moved to the terminal block rib 1a side, and the electric wire 4 is The thermal fuse 3 is set to a position under which the thermal fuse 3 is slightly pressed by the terminal block rib 1a, and the pressed dimension is absorbed by the elastic deformation of the covering portion of the electric wire 4 connected to the thermal fuse 3, and the temperature is reduced. The fuse 3 contacts the terminal block rib 1a. Then, the heat transfer responsiveness of the thermal fuse 3 can be improved by improving the adhesiveness of the junction between the thermal fuse 3 and the electric wire 4.

(Embodiment 2) As shown in FIG. 5, a projection 7a having an inclination from the insertion direction is provided inside the thermal fuse mounting 7, as shown in FIG. Then, according to this embodiment, after the thermal fuse 3 is inserted into the thermal fuse fixture 7, the thermal fuse 3 is not easily pulled out by the projection 7a, and the thermal fuse 3 is securely inserted into a predetermined position. , Workability and fixing reliability can be improved.

(Embodiment 3) A rib 7b between leads for insulating the leads 3a of the thermal fuse 3 from each other is provided inside the thermal fuse fixture 7, and the thermal fuse 3 is provided between the rib 7b and the protrusion 7a.
Is set to be stored. Then, according to this embodiment, the thermal fuse 3 is securely inserted into a predetermined position, so that the thermal fuse 3 can be more reliably positioned, and workability and fixing reliability can be improved.

(Embodiment 4) FIG. 6 shows that the thermal fuse 3 is molded simultaneously with the thermal fuse 7 inside the thermal fuse 7 as a means for contacting the terminal block rib 1a. A temperature fuse holding piece 7c is provided. According to this embodiment, the thermal fuse 3 inserted into the thermal fuse attachment 7 can be connected to the terminal block rib 1a in the groove 7g by the elasticity of the thermal fuse holding piece 7c.
And the thermal fuse 3 and the terminal block rib 1
a and the heat transfer responsiveness can be improved.

(Embodiment 5) A step 7d is provided on a resilient thermal fuse holding piece 7c provided inside the thermal fuse mounting member 7. According to this embodiment, when the thermal fuse 3 is inserted to a predetermined position, the thermal fuse 3 is not easily removed by the step 7d, so that the thermal fuse 3 can be reliably positioned, workable, and fixed. Reliability can be improved.

[0021]

As is apparent from the above description, a thermal fuse mount having an insulating structure capable of directly contacting a terminal block rib as a type in which a thermal fuse is housed in, for example, a resin case, and the thermal fuse mount By increasing the adhesion to the terminal block ribs, the heat transfer to the thermal fuse can be improved, and when the terminal block generates abnormal heat, the temperature can be detected and operated more reliably. This has the effect.

At the same time, by transmitting the terminal block more directly to the thermal fuse, the thermal responsiveness is improved, the set temperature of the thermal fuse can be increased, and a structurally larger one can be selected. Therefore, it is possible to use a larger capacity for the thermal fuse whose size is greatly related to the current interrupting capacity and the rated voltage, and the range of the insertion position of the thermal fuse in the control circuit is widened, and the parts selection becomes easy. It works. Further, there are many effects from the viewpoints of workability, cost reduction, and detection reliability.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a mounting state of a thermal fuse mounting device to a terminal block according to an embodiment of the present invention.

FIG. 2 is an upper front view of the same.

FIG. 3 is a cross-sectional view of the thermal fuse attachment according to the first embodiment of the present invention.

FIG. 4 is a top front view of the thermal fuse mounting.

FIG. 5 is a sectional view of a thermal fuse mounting according to the second and third embodiments of the present invention.

FIG. 6 is a cross-sectional view of a thermal fuse attachment according to the fourth and fifth embodiments of the present invention.

FIG. 7 is a cross-sectional view showing a state in which a thermal fuse attachment according to a conventional example is attached to a terminal block.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Terminal block 1a Terminal block rib 2 Resin cover 2a rib 3 Thermal fuse 3a Lead part 4 Electric wire 5 Screw 6 Connection terminal 7 Thermal fuse attachment 7a Projection 7b Rib between leads 7c Thermal fuse holding piece 7d Step 7g groove

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Kazumi Kamiyama 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (6)

[Claims] 1. A power supply wire is fixedly connected, a connection terminal having one terminal shape is attached to a terminal block formed of resin, and a temperature fuse attachment for attaching a temperature fuse to the terminal block is provided. A thermal fuse attachment for a terminal block, wherein a groove for fitting to a terminal block rib provided for insulation is provided, and a thermal fuse is joined to the terminal block rib at the groove portion. 2. The thermal fuse mounting device according to claim 1, wherein the thermal fuse and the electric wire are superimposed one on top of the other and the elasticity of a covering portion of the electric wire ensures adhesion between the thermal fuse and the terminal block rib. The temperature fuse attachment for the terminal block described. 3. A thermal fuse for a terminal block according to claim 1, wherein a projection is provided in the thermal fuse mounting so that the thermal fuse is not easily removed by the projection after the thermal fuse is inserted into the thermal fuse mounting. Fixture. 4. The thermal fuse mounting for a terminal block according to claim 1, further comprising a rib between leads for mutually insulating the lead portions of the thermal fuse and positioning an insertion position of the thermal fuse. 5. A thermal fuse holding member for holding a thermal fuse with elasticity in a thermal fuse mounting member, and the thermal fuse is attached to a terminal block rib in the groove by the elasticity of the thermal fuse holding member. The temperature fuse mounting for a terminal block according to any one of claims 1 to 4, which is closely attached. 6. The thermal fuse mounting for a terminal block according to claim 5, wherein a step is provided on the thermal fuse holding piece so that the thermal fuse is not easily pulled out by the step after inserting the thermal fuse into the thermal fuse mounting. .