JPS5814042Y2 - electric soldering iron - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an electric soldering iron.

In conventional electric soldering irons, the plug at the end of the cord is connected to a commercial power outlet, and electricity is applied to a heating resistor that heats the chip, thereby heating the chip.

Therefore, it is impossible to use it in a place where there is no commercial power outlet nearby, or if you extend an electric cord attached to a power strip from a commercial power source in a remote location, and then plug the tip of the cord with a soldering iron into the power strip, etc. Even if it was possible to connect and perform the work, the work efficiency was extremely poor and the work was troublesome.

In view of the above points, the present invention incorporates a small storage battery inside the handle, and uses the battery as a power source to efficiently raise the temperature of the chip to the soldering temperature in a short time with small electric power, so that it can be charged many times with one charge. The present invention provides an electric soldering iron that is effective for soldering in places where there is no commercial power supply, and will be described in detail below with reference to embodiments shown in the drawings.

Fig. 1 shows a plan view of the whole, in which 1 is a handle made of plastic, 2 is a tip, and 3 is a supporting current-carrying rod.As shown in Fig. 2, the tip 2 is a solder made of nickel, nickel alloy, etc. A heating outer cylinder 4 for melting, a heat generating resistor 5 housed in the outer cylinder, and a material made of aluminum oxide, for example, which is densely packed so that there is no void between the heating resistor 5 and the heating outer cylinder 4. It is made of an electrical insulator 6 with good thermal conductivity, such as one made by injecting an aqueous solution and solidifying it.

Further, the support current-carrying rod 3 has a conductive tube 7 made of nickel, nickel alloy, stainless steel, etc. connected to one end of the heat generating resistor 5 by welding or the like, and a conductive tube 7 that is inserted into the conductive tube 7 and connected to the other end of the heat generating resistor 5. It consists of a conductive wire 8 made of nickel, nickel alloy, stainless steel, etc. connected by welding or the like, and an insulator 9 such as a glass fiber tube that electrically insulates between the conductive wire 8 and the conductive tube 7. .

One end of the conductive cylinder 7 is inserted and fixed into the open end of the heating outer cylinder 4 via an insulator.

This fixation with an insulator is performed by attaching the above-mentioned insulator 6 to the heating outer cylinder 4.
This may be carried out by filling an aqueous solution of aluminum oxide or the like, and inserting the conductive tube 7 and the conductive wire 8 to which the heating resistor 5 is connected, and solidifying it.

Figure 3 is a plan view with the lid removed, and shows the handle 1.
The base portion 11 has a semi-cylindrical shape, and is combined with the semi-cylindrical lid portion 12 shown in FIG. 4 and screwed.

Reference numeral 13 denotes a power storage battery for heating the heating resistor 5, which is made of, for example, a rechargeable Ni-Cd sealed alkaline storage battery, and in the illustrated example, two batteries are connected in series, but they may be connected in parallel, or the number is limited to two. do not have.

14 is a push button switch inserted into the circuit between the power storage battery 13 and the heat generating resistor 5 to open and close the power circuit of the heat generating resistor 5;
15 is a switch opening/closing operation lever; 16 is an energization indicator lamp connected in parallel to the heat generating resistor 5, and is composed of a neon lamp or the like to know whether or not the heat generating resistor 5 is energized and the state of battery consumption; 17 is a through hole; A cubic connector made of a conductor in which the tip of a conductive cylinder 7 is inserted and fixed into a hole, 18 is a conductor 8 inserted into the hole.
A cubic connector made of a conductor into which the tip of the connector 17, 18 and the switch 1 are inserted and fixed.
4 is held by protrusions from the inner wall of the base portion 11 and the inner wall of the lid portion 12.

The lid part 12 has a through hole 20 for inserting a push button 19 for pressing the opening/closing operation rod 15 of the switch 14 as shown in FIG.
A through hole 21 for accommodating the indicator lamp 16 is provided.

By the way, the temperature of the chip rises and melts the solder, and the parts to be soldered are soldered.The conditions required for the chip at that time are that the amount of heat absorbed by the solder when the solder melts increases the temperature of the chip. The temperature does not drop rapidly, the temperature of the chip decreases little due to heat conduction through the conductive tube 7 and the conductive wire 8, and the heat dissipates due to convection radiation from the outside air.

In order to configure it as a soldering iron with a built-in battery, the battery capacity is considered to be optimal from the viewpoint of weight, size, and number of times of use, and the power that can be supplied to the chip is 1O~
20W is considered appropriate.

Furthermore, considering the usage conditions, it is desirable to complete one soldering process within a 15 to 20 second energization time, since it is particularly appropriate to energize only during use.

For this reason, the time required for the temperature of the heating outer cylinder 4 to reach the temperature of about 300° C. for melting the solder is preferably about 8 to 14 seconds.

The temperature at the tip of the tip varies by 3 depending on the dimensions of the tip and conductive cylinder.
The following table shows an example of the results of an experiment to determine the time it takes to reach 00°C and the time it takes for soldering to become possible.

However, the results were obtained at room temperature with a resistance of the heating resistor of 0.1Ω and a current of 12A.

From this result, the dimensions of chip 2 are 4.5 to 6 mm in diameter,
A length of about 12 to 15 mm is desirable.

If the diameter of the tip 2 is 4.5 mm or less, the heat capacity becomes too small, and the tip of the tip 2 may become red hot during energization, making it unsuitable as a soldering iron.

In the above experiment, the diameter and length of the conductive cylinder 7 were kept constant.
Even if there were slight changes in this dimension, as long as the surface area did not become too large, thermal conduction dissipation would not become a problem.

However, due to various conditions, the conductive tube 7 has an outer diameter of about 3 to 3.5 mm and a length of about 40 to 5 Q mm.

Further, the appropriate thickness of the heating outer cylinder is approximately 0.5 to 1 mm, and the thickness of the conductive cylinder 7 is approximately 0.3 to 0.5 mm.

The size of such a chip and supporting current-carrying rod is extremely small compared to the size of a conventional electric soldering iron that uses a commercial power source.

As described above, the soldering iron of the present invention accommodates the heating resistor in an extremely small heating cylinder having an opening at one end, and an electrical insulator is placed between the heating resistor and the heating cylinder. Since the chips are densely packed with no voids, the entire chip is extremely small, and the heat conduction from the heating resistor to the heating cylinder is good. A supporting current-carrying rod is formed by inserting, through an insulator, a conductive wire that serves as a current-carrying conductor to the heat-generating resistor together with the conductive cylinder through an insulator into a very small-diameter conductive cylinder whose one end is inserted and fixed through an insulator. Because it is used as a support for the handle, heat dissipation from the supporting current-carrying rod is extremely small.Also, since this supporting current-carrying rod is a conductive tube with a conductor inserted through an insulator, Even if it has a small diameter, it can have a large cross-sectional area, so it can reduce electrical loss and have relatively high mechanical strength, so even if an external force is applied to the conductive tube or if it comes into contact with an external conductor, the conductive tube will remain intact. There is no risk of short circuits with internal conductors.

Therefore, the temperature can be raised to a temperature that allows the chip to be soldered efficiently in a short time using the small power of the small storage battery built into the handle, and the switch installed in the handle supplies current to the heating resistor only when necessary. to prevent unnecessary battery consumption1
You can solder many times with just one charge.

Therefore, it can be used for soldering conductor wires to terminals of communication equipment in places without commercial power, soldering when connecting cables inside manholes, soldering MDF jumper wires in switching equipment, and soldering in a wide range of other fields. It is extremely effective.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention, in which FIG. 1 is a plan view, FIG. 2 is an enlarged cross-sectional view of the chip and supporting current-carrying rod, and FIG. 3 is a plan view with the lid removed. 4 is a back view of the lid, FIG. 5a is a plan view of the push button, and FIG. 5 is a sectional view of the push button. 1...Handle, 2...Tip, 3...
...Support current-carrying rod, 4...Heating outer cylinder, 5...
...Heating resistor, 6...Electrical insulator, 7...
... Conductive tube, 8... Conductor wire, 9...
Insulator, 13...Storage battery, 14...Switch.

Claims (1)

[Scope of utility model registration request] A heating resistor is housed in an extremely small heating outer cylinder having an opening at one end, and an electrical insulator is filled between the heating outer cylinder and the heating resistor so that there are no gaps; The conductive wire connected to the other end of the heat generating resistor is electrically insulated within an extremely small diameter conductive cylinder whose one end is inserted and fixed into the open end of the outer cylinder via an insulator and connected to one end of the heat generating resistor. It has a built-in power storage battery that supports and fixes the other end of the supporting current-carrying rod and supplies current to the resistance heating element through the conductive tube and the conductive wire from the storage battery. An electric soldering iron characterized by comprising a handle provided with a switch for opening and closing a circuit to a heating resistor.