JP5719239B2 - Cartridge heater - Google Patents

Description

  The present invention relates to a cartridge heater formed by housing a bobbin having a heater wire and a temperature sensor attached therein.

  For example, when soldering an electronic component such as a semiconductor chip using an automatic soldering device or a manual soldering device, a soldering iron incorporating a cartridge heater is used. This soldering iron heats the iron tip with the cartridge heater and melts the solder with the iron tip to perform soldering. The cartridge heater is usually disclosed in Patent Literature 1 and Patent Literature 2. Something like that is used.

  FIG. 11 shows the cartridge heater disclosed in Patent Document 1. In this cartridge heater, an electric resistance heating type heater wire 31 such as a nichrome wire is wound around a bobbin 30 having an electrical insulation property, and a temperature sensor 32 made of a thermocouple or the like is attached. Inside the cylindrical heater case 33 made of a good metal, the heater wire 31 and the temperature sensor 32 are accommodated via an electrically insulating filler 34 so as not to contact the heater case 33. Further, since the temperature sensor 32 protrudes forward from the tip of the bobbin 30, the end wall 33 a and the temperature sensor 32 are prevented from contacting the temperature sensor 32 with the end wall 33 a of the heater case 33. A sheet-like insulating member 35 is interposed therebetween.

  However, since the insulating member 35 is a very small, light and thin member, such a member is inserted into the elongate heater case 33, and the heater case is maintained in a correct posture so as not to bend or tilt. It is a very troublesome and difficult task to move to the back of 33 and accurately contact the end wall 33a of the heater case 33. Moreover, when the bobbin 30 is inserted all the way into the heater case 33, the temperature sensor 32 is strongly pressed against the insulating member 35 by the bobbin 30, and the temperature sensor 32 and the insulating member 35 are deformed or damaged. There was also a fear.

Japanese Utility Model Publication No. 61-88684 Japanese Utility Model Publication No. 47-29838

  An object of the present invention is to provide a cartridge heater capable of easily and reliably mounting a temperature sensor in a non-contact state with the heater case without interposing an insulating member as described above between the heater case and a bobbin. There is to do.

In order to achieve the above object, a cartridge heater according to the present invention has a heater wire and a temperature sensor attached to an electrically insulating bobbin, and accommodates the bobbin in a cylindrical heater case from the tip side. The bobbin is formed by filling an electrically insulating filler inside, and the bobbin body around which the heater wire is wound, and the bobbin body is formed separately from the bobbin body and attached to the tip of the bobbin body. The bobbin receiver has a shape such that a side surface of a cylinder having a partition wall inside is cut out along two planes parallel to and parallel to the axis of the bobbin, A first recess on the rear side and a second recess on the front side separated by the partition wall, wherein the depth of the first recess is deeper than the depth of the second recess, and the bobbin is in the first recess. Body tip is fitted in, accommodated in the second recess, the temperature detecting portion of the temperature sensor, the state of non-contact with the end wall of the state and the heater case of the non-projecting forwardly from the second recess It is characterized by being.

In the present invention, the bobbin receiver may have a slit extending over the entire length of the bobbin receiver at a position opposite to the side surface.
Furthermore, the heater wire has a spiral portion formed by spirally winding a part of the heater wire in advance, and a conductive wire portion connected to both ends of the spiral portion. The heater wire is preferably attached to the bobbin by inserting the bobbin main body and attaching the bobbin receiver to the bobbin main body.

  According to the present invention, the bobbin is divided into a bobbin main body for attaching the heater wire and a bobbin receiver for attaching the temperature sensor, and the temperature detection of the temperature sensor is performed in the housing portion formed in the bobbin receiver. By housing the part in a non-projecting state, the temperature sensor can be easily and reliably attached to the heater case in a non-contact state without interposing a conventional insulating member between the bobbin and the heater case. Can do.

It is principal part sectional drawing of the state which accommodated the heater for soldering irons concerning this invention in the inside of a soldering iron. It is sectional drawing of the said heater. It is a disassembled perspective view of the said heater. It is a side view of a bobbin main body. It is a right side surface of FIG. It is sectional drawing in the VI-VI line in FIG. It is a side view of a bobbin receiver. It is sectional drawing in the VIII-VIII line in FIG. It is sectional drawing in the IX-IX line in FIG. It is a side view of a heater wire. It is sectional drawing of the conventional heater.

  FIG. 1 shows a part of the tip of a soldering iron incorporating a cartridge heater according to the present invention. This soldering iron may be a soldering iron attached to the hand of an automatic soldering device (soldering robot) or a hand-held soldering iron used in a manually operated soldering device.

  The solder rod is a rod body 1 formed of a pipe made of a metal such as stainless steel, and a copper-iron plated or copper-iron alloy tip 2 attached to the tip of the rod body 1; A cartridge heater 3 housed inside the flange body 1, and the tip of the cartridge heater 3 is fitted into a heater mounting hole 2 a formed in the flange 2, and the flange 2 And the tip 2 is heated by the heat from the cartridge heater 3.

  2 and 3, the cartridge heater 3 includes an electrically insulating bobbin 4, a heater wire 5 wound around the bobbin 4, a temperature sensor 6 attached to the bobbin 4, and the bobbin. 4 having a cylindrical heater case 7 in which the powder is contained, and in the heater case 7, a powdery or cement-like electrical insulating material made of magnesia, alumina or the like so as to fill a gap around the bobbin 4. And an electrically insulating sealing material 9 for sealing the heater case 7 at the position of the rear end of the bobbin 4 is provided.

  The bobbin 4 is formed separately from the bobbin body 10 by baking and solidifying the same powder material as the bobbin body 10 formed by baking and solidifying powders of magnesia, alumina, and the like, and is attached to the bobbin body 10. And the bobbin receiver 11 formed.

  As apparent from FIGS. 3 to 6, the bobbin body 10 includes a round bar-shaped main body portion 10 a around which the heater wire 5 is wound, and one end of the main body portion 10 a in the axis L direction, that is, a base end portion. The other end of the main body portion 10a in the direction of the axis L, that is, the tip portion 10c ends with a uniform diameter, and the bobbin receiver 11 is attached to the tip portion 10c. .

  The flange portion 10b has a shape obtained by cutting a circular part along two planes parallel to each other. The two arc-shaped portions 10d and 10d facing each other and the arc-shaped portions 10d and 10d The two arcuate portions 10d and 10d have a radius of curvature larger than the radius of the main body portion 10a, and the distance between the two flat portions 10e and 10e is The diameter of the main body 10a is approximately the same.

As can be seen from FIG. 5, four holes 12 a to 12 d positioned so as to surround the axis L are formed in the end surface of the bobbin main body 10 on the base end side.
Of the four holes 12a-12d, the first hole 12a and the second hole 12b located on the left and right in the drawing are for inserting the two metal wires 6b and 6c forming the temperature sensor 6. Thus, it extends in parallel with the axis L, penetrates the bobbin main body 10, and opens at the distal end surface of the main body 10a. Further, the third hole 12c and the fourth hole 12d located at the top and bottom of the figure are for inserting the heater wire 5, and as is apparent from FIGS. The third hole 12c extends parallel to the axis L and penetrates the bobbin main body 10, and is open to the end surface and the side surface of the tip 10c of the main body 10a. The fourth hole 12d located below is , Extending obliquely with respect to the axis L and opening on the side surface of the bobbin main body 10 at the boundary between the main body 10a and the flange 10b.

  As can be seen from FIGS. 7 to 9, the bobbin receiver 11 has a larger diameter than the main body portion 10a of the bobbin main body 10, and is a hollow member having the same diameter as the flange portion 10b or a larger diameter. And has a mounting portion 13 for mounting on the tip of the main body portion 10a on one side in the direction of the axis L, and accommodates the temperature detection portion 6a of the temperature sensor 6 in a non-projecting state on the other side. It has the accommodating part 14 for doing.

  The configuration of the bobbin receiver 11 will be described in more detail. The bobbin receiver 11 has a shape in which a part of a side surface of a cylinder having a partition wall 16 is cut out along two parallel planes. A pair of side walls 15 and 15 having an arcuate cross-section facing each other in a posture in which the curved surfaces face each other, the partition wall 16 connecting the pair of side walls 15 and 15 at an intermediate position in the axis L direction, A slit 19 that has a first concave portion 17 and a second concave portion 18 separated by a partition wall 16 and extends on the side surface of the bobbin receiver 11 at a position opposite to the left and right over the entire length of the bobbin receiver 11. Is formed. The mounting portion 13 is formed by the first concave portion 17, the accommodating portion 14 is formed by the second concave portion 18, and the distal end portion 10 c of the main body portion 10 a of the bobbin main body 10 is formed in the first concave portion 17. The temperature detecting portion 6 a of the temperature sensor 6 is inserted in the second recess 18 so as not to protrude forward from the bobbin receiver 11.

  Further, the partition wall 16 is formed with two holes 20a and 20b adjacent to each other on the left and right sides, and the first hole 20a communicates with the first hole 12a of the bobbin body 10 and the second hole 20a The hole 20 b communicates with the second hole 12 b of the bobbin main body 10.

  The depth of the first recess 17 and the second recess 18, that is, the length in the axis L direction, is not the same as each other, and the depth of the first recess 17 into which the main body 10 a is inserted accommodates the temperature sensor 6. It is formed to be larger than the depth of the second recess 18 so that the bobbin main body 10 and the bobbin receiver 11 are stably coupled. However, the depths of the first recess 17 and the second recess 18 may be the same, or the second recess 18 may be provided if the bobbin body 10 and the bobbin receiver 11 are coupled so as not to come off. May be larger than the depth of the first recess 17.

  The heater wire 5 is formed of a wire material such as a nichrome wire that generates heat due to electric resistance. As shown in FIG. 10, a part of the heater wire 5 is previously spirally wound and a shape maintaining treatment (for example, It has a spiral portion 5a formed so as to maintain a spiral shape by performing a heat treatment, and two conductive wire portions 5b and 5c extending from both ends of the spiral portion 5a.

Then, the main body portion 10a of the bobbin body 10 is inserted into the spiral portion 5a, and the first conductor portion 5b connected to the tip of the spiral portion 5a is inserted into the third hole 12c of the bobbin body 10. The bobbin main body 10 extends from the rear end of the bobbin main body 10 and the second conductive wire portion 5c connected to the rear end of the spiral portion 5a is inserted into the fourth hole 12d of the bobbin main body 10 so that the bobbin The heater wire 5 is attached to the bobbin 4 by extending from the rear end portion of the main body 10, and then the bobbin receiver 11 is attached to the tip of the main body portion 10a.
By configuring the heater wire 5 in this way, it is not necessary to perform the troublesome work of winding the heater wire 5 around the bobbin 4 as in a conventional heater, and the heater wire 5 can be attached to the bobbin 4 very easily. .

  The end portions of the first conductor portion 5b and the second conductor portion 5c of the heater wire 5 are connected to normal lead wires 21a and 21b that do not generate heat via terminals 22 at positions relatively close to the bobbin 4, It is led out of the heater case 7. This prevents the influence of heat generated by the heater wire 5 from reaching the position away from the bobbin 4.

The temperature sensor 6 is formed by a thermocouple in which the tip portions of two types of metal wires 6b and 6c are joined to each other, and the tip portion serves as a temperature detection portion 6a.
Then, one metal wire 6b is inserted from the front end side of the bobbin receiver 11 into the first hole 20a of the bobbin receiver 11 and the first hole 12a of the bobbin main body 10, and the rear end of the bobbin main body 10 is inserted. The other metal wire 6c is similarly inserted into the second hole 20b of the bobbin receiver 11 and the second hole 12b of the bobbin body 10 to extend from the rear end of the bobbin body 10. The temperature sensor 6 is attached to the bobbin 4 by allowing the temperature detection unit 6 a to be housed in the housing part 14 of the bobbin receiver 11 so as not to protrude forward of the bobbin receiver 11.

  Thus, the bobbin 4 to which the heater wire 5 and the temperature sensor 6 are attached is inserted into the heater case 7 to a position where the tip of the bobbin receiver 11 contacts the end wall 7a of the heater case 7. Then, the filler 8 is filled in the heater case 7 through a gap between the flat portion 10e of the flange portion 10b and the inner peripheral surface of the heater case 7. The cartridge heater 3 is assembled by providing the sealing material 9. At this time, the filler 8 also flows into the housing portion 14 on the front side of the bobbin receiver 11 through the gap between the side surface of the bobbin receiver 11 and the inner peripheral surface of the heater case 7 and the slit 19. The temperature sensor 6 is surrounded by a temperature detector 6a.

The cartridge heater 3 is configured in this way, and the temperature detecting portion 6a of the temperature sensor 6 is accommodated in the accommodating portion 14 of the bobbin receiver 11 so as not to protrude forward from the accommodating portion 14. Even if the bobbin 4 is inserted into the heater case 7 to a position where the tip of the bobbin receiver 11 comes into contact with the end wall 7a, the temperature detector 6a does not contact the end wall 7a. In addition, since the accommodating portion 14 is separated from the tip portion 10c of the bobbin body 10 by the partition wall 16, the temperature detecting portion 6a is pushed by the tip portion 10c of the bobbin body 10 and the end wall 7a of the heater case 7 is pressed. It is not pressed against.
Further, since the bobbin 4 is positioned by inserting the bobbin receiver 11 to a position where the tip of the bobbin receiver 11 contacts the end wall 7a of the heater case 7, the bobbin 4 can be positioned accurately and easily.

  If necessary, an electrically insulating cap can be fitted into the accommodating portion 14 of the bobbin receiver 11 and the front surface of the accommodating portion 14 can be covered with the cap. In this case, it is desirable to provide a slit similar to the slit 19 formed on the side surface of the housing portion 14 on the side surface of the cap.

In the embodiment, the bobbin main body 10 has the flange portion 10b on the base end side of the main body portion 10a. However, the flange portion 10b is not always necessary and can be omitted. In this case, the base end portion of the main body portion 10a is formed so as to end with a uniform diameter in the same manner as the front end portion 10c.
Further, the bobbin receiver 11 may have a complete cylindrical shape without the slit 19 on the side surface.
Furthermore, the cartridge heater of the present invention can be used as a heating source for things other than soldering irons.

DESCRIPTION OF SYMBOLS 3 Cartridge heater 4 Bobbin 5 Heater wire 5a Spiral part 5b, 5c Conductor part 6 Temperature sensor 6a Temperature detection part 8 Filler 10 Bobbin main body 10a Main part 10c Tip part 11 Bobbin receptacle 13 Mounting part 14 Storage part 15 Side wall 16 Partition wall 17 1st recessed part 18 2nd recessed part 19 Slit L axis

Claims (3)

A cartridge in which a heater wire and a temperature sensor are attached to an electrically insulating bobbin, the bobbin is accommodated in a cylindrical heater case from the front end side, and an electrically insulating filler is filled in the heater case. In the heater,
The bobbin comprises a bobbin main body around which the heater wire is wound, and a bobbin receiver that is formed separately from the bobbin main body and attached to the tip of the bobbin main body,
The bobbin receiver has a shape in which a side surface of a cylinder having a partition wall inside is cut out along two planes parallel to and parallel to the axis of the bobbin and separated by the partition wall. It has a first recess on the rear side and a second recess on the front side, and the depth of the first recess is deeper than the depth of the second recess, and the tip of the bobbin body is fitted in the first recess. In the second recess, the temperature detection part of the temperature sensor is housed in a state of not projecting forward from the second recess and not contacting the end wall of the heater case .
A cartridge heater characterized by that. The bobbin receiving the cartridge heater according to claim 1, characterized in that it comprises a slit extending over the entire length of the receiving the bobbin position opposing sides. The heater wire has a spiral portion formed by spirally winding a part of the heater wire in advance, and a conductive wire portion connected to both ends of the spiral portion, and the bobbin main body in the spiral portion by attaching the bobbin received in the bobbin body by inserting a cartridge heater according to claim 1 or 2, wherein the heater wire is attached to the bobbin.

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