JP4181581B2 - Soldering heater and tip side member used therefor - Google Patents

Description

  The present invention relates to a structure of a tip side portion (tip side member) including a tip of a solder heating tool represented by a soldering iron. Moreover, it is related with the structure of the soldering heater using it.

  For example, the structure near the tip of a conventional general solder heating apparatus is as shown in FIG. FIG. 10 (a) is a partial front view of a conventional electric soldering iron 90 (solder heating instrument), and FIG. 10 (b) is an exploded perspective view thereof. A tip tip 93 housed in a protective pipe 96 is provided at the tip of the electric soldering iron 90. The protective pipe 96 is fixed to the nipple 98 of the casing 91 by a nut 92. A recessed portion 93 d is formed on the inner side of the cylindrical body portion covered with the protective pipe 96 of the tip 93. The ceramic heater 94 protruding from the casing 91 is assembled in the recess 93d so as to be fitted through an insert pipe 95 made of stainless steel or the like.

  The tip chip 93 is made of copper, a copper alloy, or the like, and an iron plating for preventing erosion by the solder is applied to the tip portion thereof. However, since the erosion due to the solder still proceeds little by little, the tip 93 is usually a replacement part.

  In general, a large number of tip tips 93 having various tip shapes are prepared, and the operator selects and replaces the optimum tip tip 93 according to the part and range to be soldered. To do.

  When replacing the tip 93, the nut 92 is completely removed from the casing 91, the nut 92 and the protective pipe 96 are once removed from the tip 93, and the tip 93 is removed and replaced. .

  However, in the conventional structure as described above, there is a gap (air gap) between the ceramic heater 94 and the insert pipe 95, or between the insert pipe 95 and the tip tip 93, so that the heat transfer rate is low. It was sufficient and the heat loss was large. For this reason, the rise time to the set temperature after power-on becomes longer, the temperature drop during continuous soldering becomes larger, or the return time from the lowered temperature to the set temperature after continuous soldering becomes longer. There was a problem such as.

  The present invention has been made to solve such problems of the prior art, and by increasing the heat transfer rate from the ceramic heater to the tip of the tip and suppressing heat loss, the rise time and It is a first object of the present invention to provide a tip side member capable of shortening a temperature recovery time and suppressing a temperature drop during soldering, and a solder heating apparatus using the same.

  On the other hand, as a kind of solder heating apparatus, one that ejects an inert gas such as nitrogen from the vicinity of a tip such as a soldering iron is known. This is done to prevent oxidation of the solder by making the vicinity of the tip oxygen-free. In the prior art in that case, an inert gas is introduced into the casing 91, and a gas passage is formed near the tip of the tip 93 from the inside of the casing 91 to guide the inert gas. For example, Japanese Patent Laid-Open No. 2001-347369 discloses such a soldering iron having a double pipe structure in which a pipe is further provided outside the protective pipe 96, and a structure in which an inert gas is passed through the gap between the pipes. It is shown.

  A second object of the present invention is to provide a solder heating device that can achieve a simpler structure while achieving the first object in the type of solder heating device that ejects such an inert gas. It is in.

The tip member for the solder heater according to the present invention is provided with a metal tip chip that is brought into direct contact with the solder and melted, and a temperature detecting portion provided near the tip, and a heat generating portion on the base end side thereof. The tip is provided with a ceramic heater having a different coefficient of thermal expansion from the tip of the tip, and inside the tip of the tip is provided a recess into which the ceramic heater is inserted in close contact, The depth of the concave portion is equal to or more than the length from the tip of the ceramic heater to the heat generating portion, and the portion forming the concave portion is a plane including the axis of the concave portion from the opening to the vicinity of the bottom surface. And provided with a cylindrical member that covers the base end side of the tip of the tip, the tip of the tip corresponding to the vicinity of the bottom surface of the recess. Press-fit into the tubular member In other portions, a slight gap is provided between the outer peripheral surface of the tip of the tip and the inner surface of the cylindrical member, and the cylindrical member is provided near the proximal end of the tip of the tip. In the corresponding position, there is provided a throttle part in which at least a part of the outer peripheral surface of the cylindrical member is recessed inward, and in the throttle part, there is a gap between the outer peripheral surface of the tip of the tip and the inner surface of the throttle part It is comprised so that it may contact | abut.

  In this way, the tip tip and the ceramic heater are brought into close contact with each other, so that the heat transfer rate from the ceramic heater to the tip tip can be increased and heat loss can be suppressed. Further, when using the soldering heater, the tip of the tip and the ceramic heater are slightly thermally deformed due to the high temperature. Since the tip chip and the ceramic heater are made of different materials, the coefficient of thermal expansion is also different. If the tip and the ceramic heater are completely fixed in close contact, the ceramic heater may be damaged due to the difference in expansion. However, according to the configuration of the present invention, since the deformation (expansion) in the radial direction of the tip is absorbed by the increase or decrease in the width of the notch, a large compressive force or tensile force acts on the ceramic heater. This can be effectively prevented.

Further , the strong contact between the tip of the tip and the ceramic heater can be suppressed to a minimum such as a portion corresponding to the press-fitting portion and the throttle portion. Therefore, even when a difference in thermal expansion occurs, mutual axial displacement tends to occur, and it is possible to effectively prevent a large compressive force or tensile force from acting on the ceramic heater.

As a more specific structure of the constricted portion, the constricted portion is a planar step recessed inward from the outer peripheral surface of the cylindrical member, and restricts the tip of the tip from spreading to both sides of the notch. It is preferable that a plurality of positions be provided. For example, in the case where the throttle portions are provided at two locations on the cylindrical member, it is preferable that the line connecting the two throttle portions is provided so as to be substantially orthogonal to the plane including the notch of the tip. In this way, since each of the tips of the tip divided by the cut is sandwiched from both sides, it is possible to effectively restrict the tip from spreading on both sides of the cut. As a result, the degree of adhesion between the tip and the ceramic heater can be increased. In addition, you may provide three or more aperture | diaphragm | squeeze parts which are this planar level | step differences.

Further, as another specific structure of the throttle part, the throttle part may be one in which the cylindrical member is linearly reduced along the outer peripheral surface thereof. In this way, the spread of soldering iron tip, it means to regulate the entire circumference at its reduced diameter aperture portion, similarly to the throttle portion is the planar-shaped step, the soldering iron tip and the ceramic heater The degree of adhesion can be increased.

  It should be noted that the place where the tip of the tip is press-fitted into the cylindrical member is preferably located at a position corresponding to the temperature detecting portion of the inserted ceramic heater. If it does in this way, the adhesion degree in a temperature detection part will become especially high, and a more accurate temperature detection will be attained. Therefore, even if heat is temporarily deprived from the tip of the tip of the tip by soldering, it can be detected quickly and accurately by the temperature detection unit, and heat that compensates for it can be detected from the tip of the tip. Can be transmitted at high speed and with low loss.

  A solder heating device in which the above-mentioned solder heating device tip side member is detachably provided on the main body side member that supports the solder heating device includes tip tips of various shapes according to the part and range to be soldered. By preparing the tip side member, it can be appropriately selected and used.

  In addition, an inert gas ejection type solder heating apparatus is used in the main body side member, and introduces an inert gas into the main body side member, and the tip of the tip of the tip. An outer peripheral surface of the ceramic heater at the notch, provided near the gas ejection part for ejecting the introduced inert gas and a gas passage for guiding the inert gas from the gas introduction part to the gas ejection part Part of the gas passage is formed by a gap between the cylindrical member and the inner surface of the cylindrical member, and the vicinity of the bottom surface of the recess is exposed from the cylindrical member so as to form the gas ejection part. Good.

  In this way, the gap generated by the above-mentioned cutting can be used as an inert gas passage for the inert gas, so that it is not necessary to have a double pipe structure as in the conventional structure, and the structure is simplified. Can do.

  As described above, the tip member for a solder heater according to the present invention can suppress a temperature drop during soldering in a solder heater using the same, and rises to a set temperature after power-on. It is possible to shorten the time and the return time until the temperature returns from the lowered temperature to the set temperature after continuous soldering. In particular, when it is used in a solder heating apparatus of a type that ejects an inert gas, a simpler structure can be obtained.

  Below, it demonstrates concretely about embodiment of the soldering heater which concerns on this invention.

(First embodiment)
FIG. 1 is a front view of an electric soldering iron 10 (solder heating instrument) according to a first embodiment of the present invention, in which (a) shows a state in which a tip side member 20 is held by a main body side member 25; b) shows a state in which the tip side member 20 is removed from the main body side member 25.

  FIG. 2 is a partial cross-sectional view of FIG.

  The structure of the electric soldering iron 10 will be described with reference to FIGS. The basic structure of the electric soldering iron 10 is formed by inserting a detachable tip side member 20 at the tip of the main body side member 25 (left side in FIG. 1).

  The tip of the tip-side member 20 is mainly made of copper (or a material having high thermal conductivity such as copper alloy, silver, or silver alloy), and is soldered in direct contact with the solder. A tip 3 is provided. The tip end side of the tip 3 is fitted into a protection pipe 6 (cylindrical member), and the tip end side is exposed from the protection pipe 6 and formed into a shape suitable for soldering.

  A concave portion is provided inside the tip 3 and has a bottomed cylindrical shape. In this recess, the ceramic heater 4 is inserted in close contact. The ceramic heater 4 is provided with a temperature detector 4a near the tip, and a heat generating part 4b on the base end side. These wires are led out to the outside by lead wires 8 (temperature detecting portion lead wires 8a and heat generating portion lead wires 8b) and connected to the tip side connector 9. Further, the base end side of the ceramic heater 4 is fitted and held in a substantially cylindrical holder 7 made of metal. As shown in FIGS. 1B and 2, the tip 3, the ceramic heater 4, the protective pipe 6, the holder 7, the lead wire 8, and the tip-side connector 9 are integrally formed.

  The main body side member 25 mainly comprises a casing 1, a fixing nut 2, and an O-ring 12 (elastic member) sandwiched between them. The casing 1 is a generally tubular member made of metal or made of a hard, heat-resistant synthetic resin, and an operator can hold and handle the electric soldering iron 10 around the casing 1. Synthetic resin having heat insulating properties and elasticity such as synthetic rubber is provided as the grip portion 1a. Inside the casing 1, a main body side connector 15 to be joined to the tip side connector 9 is provided, and an electric cord 1b is connected thereto. The electric cord 1b is led out of the casing 1 and is connected to a controller (not shown) (a control device that supplies power controlled to keep the tip temperature at a set value to the ceramic heater 4).

  The fixed nut 2 is a nut-like member that is screwed onto the outer peripheral portion of the tip of the casing 1. A knurling process is performed on the outer peripheral portion to facilitate manual rotation by the operator. Then, by rotating the fixed nut 2, the fixed nut 2 can freely move in the axial direction within a movable range with respect to the casing 1.

  An O-ring 12 is provided so as to be sandwiched between the inner diameter side step portion of the fixing nut 2 and the front end surface of the casing 1. The O-ring 12 is made of an elastic body such as rubber, and is provided at a position where the holder 7 is fitted and inserted with the tip side member 20 inserted.

  A countersunk screw 5 that prevents the fixing nut 2 from completely coming off the casing 1 is provided on the rear end side of the fixing nut 2 from the female screw forming portion.

  FIG. 3 is a conceptual diagram showing the configuration of the ceramic heater 4. FIG. 3A shows the circuit configuration of the ceramic heater 4. FIG. 3B shows the ceramic heater 4 wound around the ceramic rod 4d. The state where it is formed is shown. The structure of the ceramic heater 4 will be described with reference to FIG.

  The ceramic heater 4 is obtained by simultaneously printing a pattern of a temperature sensitive resistor such as tungsten provided on the temperature detecting portion 4a and a pattern of a heat generating resistor such as tungsten provided on the heat generating portion 4b on the ceramic green sheet 4c. Is wound around a cylindrical ceramic rod 4d made of alumina, silicon nitride or the like as a base and sintered and integrated. A temperature detection unit lead wire 8 a is led out from the temperature detection unit 4 a and a heat generation unit lead wire 8 b is led out from the heat generation unit 4 b and coupled to the tip side connector 9.

  4A and 4B are diagrams showing a detailed structure around the tip 3, wherein FIG. 4A is a partial cross-sectional view, and FIG. 4B is a cross-sectional view taken along line III-III in FIG. (C) is an enlarged view of the vicinity of the p and q parts in (a). The detailed structure around the tip 3 will be described with reference to FIG.

  A concave portion 3d is provided inside the tip 3 to form a bottomed cylindrical shape, and the tip end side of the ceramic heater 4 is inserted. The inner diameter of the recess 3d is the same as the outer diameter of the ceramic heater 4 or slightly smaller (about 0.1 mm). The front end side of the ceramic heater 4 is press-fitted into the recess 3d so that the ceramic heater 4 and the tip 3 are in thermal contact with each other.

  The depth of the recess 3d is equal to or greater than the length from the tip of the ceramic heater 4 to the heat generating portion 4b. That is, the temperature detection unit 4 a and the heat generation unit 4 b of the ceramic heater 4 are in a state where the periphery is covered with the tip 3. The outer diameter of the bottom side (tip side) of the bottomed cylindrical part of the tip 3 is relatively large (large diameter part 3a). The range of the large-diameter portion 3a is a portion that substantially corresponds to the temperature detecting portion 4a in a state where the ceramic heater 4 is inserted, and corresponds to a tip portion of the protective pipe 6 in a state where the ceramic heater 4 is inserted into the protective pipe 6. It is a part to do. The bottomed cylindrical portion closer to the base end than the large diameter portion 3a is a small diameter portion 3b having a slightly smaller diameter than the large diameter portion 3a.

  A portion (mainly the large diameter portion 3a and the small diameter portion 3b) that forms the recess 3d has a plane including the axis of the recess 3d from the opening to the vicinity of the bottom surface (in FIG. 4A, the axis of the recess 3d). A notch 3c is provided so as to divide a cross section (cross section shown in FIG. 4B) perpendicular to the axial center through a plane perpendicular to the paper surface. The cut 3c is further deeper than the large diameter portion 3a, and in the state where the cut is inserted into the protective pipe 6, the tip side is exposed to form a cut exposed portion 3e.

  By the cut 3c, the large diameter portion 3a and the small diameter portion 3b of the tip 3 are easily spread on both sides of the cut 3c. Therefore, when the ceramic heater 4 is inserted and there is nothing that restricts the outer periphery thereof (the state where the ceramic heater 4 is not yet inserted into the protective pipe 6), the outer peripheral surface of the ceramic heater 4, the large diameter portion 3a, and the small diameter portion. Although it is in close contact with the inner peripheral surface of 3b, the contact force is relatively weak.

  The inner diameter of the protective pipe 6 when it is free is slightly smaller than the large diameter portion 3a and slightly larger than the small diameter portion 3b. Therefore, when the tip 3 is inserted into the protective pipe 6, the large diameter portion 3 a is press-fitted and a small gap is formed between the small diameter portion 3 b and the protective pipe 6. Two throttle portions 6a are formed at a position (q portion in FIGS. 4A and 4C) corresponding to the vicinity of the proximal end of the tip 3 of the protection pipe 6. The throttle portion 6a is a substantially planar step that is recessed inward from the outer peripheral surface of the protective pipe 6, and extends in the axial direction. The two narrowed portions 6a are provided at a position where a line connecting them (up and down direction in FIG. 4B) and a plane including the cut 3c (a plane having a cross section in the left and right direction in FIG. 4B) are orthogonal to each other. It has been. In other words, each portion of the tip 3 cut by the cut 3c is sandwiched by the narrowed portion 6a from both sides. The inside of the narrowed portion 6a is in contact with the outer peripheral surface of the small diameter portion 3b without any gap.

  Since the restricting portion 6a is provided in this way, the large diameter portion 3a and the portion of the small diameter portion 3b that contacts the restricting portion 6a are protected when the tip 3 is inserted into the protective pipe 6. It is strongly regulated by the pipe 6. For this reason, the degree of adhesion between the ceramic heater 4 and the tip 3 is also high at locations corresponding to these (the first strong contact h and the second strong contact j). As described above, since the ceramic heater 4 is strongly adhered at almost both ends of the portion to be inserted into the tip 3, the overall degree of adhesion is also high.

  In addition, you may make it show in FIG. 5 as a modification of the aperture | diaphragm | squeeze part 6a. FIGS. 5A and 5B are views corresponding to FIGS. 4B and 4C and showing the aperture 6a ′. The narrowed portion 6 a ′ is a hollow linearly reduced along the outer peripheral surface of the protective pipe 6. Similar to the narrowed portion 6 a, the narrowed portion 6 a ′ is located at a position (q portion) corresponding to the vicinity of the proximal end of the tip 3. Is provided. In the throttle portion 6a ', the outer peripheral surface of the small diameter portion 3b and the inner surface of the throttle portion 6a' are in contact with each other without a gap. Therefore, the expansion portion 6a 'regulates the expansion of the tip 3 over the entire circumference, and the degree of adhesion between the tip 3 and the ceramic heater 4 can be increased as in the case of the expansion portion 6a.

  Next, the operation of the electric soldering iron 10 having the above structure will be described. First, when performing soldering, the operator selects the tip side member 20 having a tip shape optimal for work and inserts it on the main body side member 25. At that time, the fixing nut 2 is loosened and the holder 7 is inserted into the tip of the casing 1.

  After the holder 7 is inserted, the fixing nut 2 is tightened to deform the O-ring 12, and the holder 7 is fixed by pressing it from the periphery. After inserting the tip side member 20 into the main body side member 25 in this way, the operator turns on the power of the controller (not shown) and sets the required tip temperature. Electric power corresponding to the set temperature is supplied from the controller to the heat generating part 4b of the ceramic heater 4, and the heat generating part 4b generates heat.

  The heat generated in the heat generating portion 4b is transmitted to the tip 3 but since the ceramic heater 4 and the large diameter portion 3a and the small diameter portion 3b of the tip tip 3 are in good contact with each other, the heat conduction thereof is performed. Is done at high speed and low loss.

  The temperature at the tip of the tip 3 is detected by the temperature detector 4a of the ceramic heater 4 and transmitted to a controller (not shown). Since the vicinity of the temperature detection unit 4a is the first strong contact h, the degree of adhesion is particularly high, and more accurate temperature detection is possible. Therefore, even if heat is temporarily deprived from the tip of the tip 3 by soldering, it can be detected quickly and accurately by the temperature detection unit 4a, and the heat to supplement it is transmitted from the heating unit 4b. It can be transmitted to the tip of the tip 3 at high speed and with low loss.

  FIG. 6 is an explanatory diagram comparing the temperature characteristics of the electric soldering iron 10 with the temperature characteristics of an electric soldering iron 90 having a conventional structure (see FIG. 10), and (a) shows the temperature characteristics of the electric soldering iron 10. (B) shows the temperature characteristics of an electric soldering iron 90 having a conventional structure. The horizontal axis represents time (S), and the vertical axis represents tip temperature (° C.).

  The set temperature was 350 ° C., and the same controller was used. With these temperature characteristics, an operation corresponding to continuous soldering (hereinafter referred to as continuous soldering) is performed in a section where the temperature is intensely rising and falling. Continuous soldering was performed by bringing a tip into contact with a solder-filled portion containing lead on a copper phenol substrate having a 10 mm square cut surface at intervals of 3 seconds.

  Referring to FIG. 6B, in the conventional structure, the rise time t11 when the tip temperature rises to the set temperature after power-on is t11 = 71 s. Further, in the continuous soldering section, the temperature drop Td11 (generated by delaying the temperature return for each time) was Td11 = 45 ° C. And after continuous soldering, the return time t12 until returning to the set temperature again was t12 = 23 s.

  On the other hand, according to the electric soldering iron 10 of the present embodiment, referring to FIG. 6A, the rising time t1 = 24 s (about ３ of t11) and the temperature drop Td1 = 5 ° C. (of Td11). 1/9) and return time t2 = 4 s (about 1/6 of t12). That is, the temperature rise time and recovery time are greatly shortened, and the temperature drop is drastically reduced. This is because, as a result of using the tip side member 20 of the present embodiment, heat is transferred from the heat generating portion 4b to the tip of the tip tip 3 at high speed and with low loss, and the temperature detection accuracy of the temperature detection portion 4a. This is a remarkable effect due to the improvement.

  When the electric soldering iron 10 is used, the tip 3 and the ceramic heater 4 are slightly thermally deformed due to heat due to the high temperature. Since the tip chip 3 and the ceramic heater 4 are made of different materials, the coefficients of thermal expansion are also different. If the tip 3 and the ceramic heater 4 are completely fixed in close contact with each other, the ceramic heater 4 may be damaged due to the difference in expansion. Prevent it. That is, the deformation (expansion) in the radial direction of the tip 3 is absorbed by the increase / decrease of the width of the notch 3 c, thereby preventing a large compressive force or tensile force from acting on the ceramic heater 4. . As for the axial deformation, since the strong contact is minimized to the first strong contact h and the second strong contact j, mutual axial displacement is likely to occur while being in close contact with each other. Force and tensile force are not applied.

  When it is necessary to replace the tip 3, the power is turned off, the fixing nut 2 is loosened, the tip side member 20 is pulled, and a new tip side member 20 is inserted and replaced.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 7 is a front cross-sectional view of a solder heating apparatus (gas ejection type electric soldering iron 50) according to the second embodiment, and shows a state where the tip side member 58 is inserted into the main body side member 59. In the following embodiments, the same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description thereof is omitted.

  A gas introduction portion 52 for introducing an inert gas (nitrogen or the like) into the casing 51 (main body side member 59) is provided at the base end portion of the casing 51. A connection terminal 55 is connected to the gas introduction part 52 and is connected to an inert gas supply device (not shown) through a gas introduction pipe 57.

  On the other hand, a gas rectifying cap 53 is attached near the tip of the protective pipe 6. The gas rectifying cap 53 is a substantially cylindrical rectifying plate that surrounds the notch exposed portion 3e (see FIG. 4A) with a gap, and collects the inert gas ejected in the radial direction from the notch exposed portion 3e. The tip 3 is configured to be guided in the tip direction. Other configurations are the same as those of the first embodiment.

  FIG. 8 is an enlarged view of the vicinity of the tip 3 shown in FIG. However, for the sake of explanation, the tip 3 is shown rotated by 90 ° around the axis. With reference to FIG.7 and FIG.8, the effect | action regarding an inert gas is mainly demonstrated. The inert gas introduced into the casing 51 from the gas introduction part 52 passes through the internal gap of the casing 51 as shown by the arrows in FIG. Led to. At this time, the airtightness of the connecting portion between the tip side member 58 and the main body side member 59 is held by the O-ring 12.

  The inert gas introduced into the tip side member 58 reaches the tip 3 through the gap between the ceramic heater 4 and the protective pipe 6. And it ejects from the notch exposure part 3e through the notch 3c (refer FIG.8 and FIG.4 (b)) of the tip 3 of a tip. The ejected inert gas is guided to the vicinity of the tip of the tip 3 by the gas rectifying cap 53 to make the vicinity of the tip an oxygen-free atmosphere. Therefore, oxidation of the solder is prevented during soldering, and good soldering can be performed.

  As described above, since the inert gas is guided to the tip using the cut 3c, a conventional structure (a double structure in which a pipe is further provided outside the protective pipe 6 is provided, and a gap between the pipes is provided. The structure can be made simpler than the structure in which an inert gas is passed through. Further, the connection between the protective pipe 6 and the gas rectifying cap 53 may be detachable with a screw or the like. When it is not necessary to eject the inert gas, the visibility of the tip during soldering is improved by removing the gas rectifying cap 53.

(Third embodiment)
Next, a third embodiment of the present invention will be described. FIG. 9 is a front partial cross-sectional view of a solder heating apparatus (electrical solder blotting irons 60, 70) according to the third embodiment. The electric solder sucking irons 60 and 70 melt and suck and remove solder, and are provided with solder suction tubes 61 and 71.

  FIG. 9A shows the solder suction pipe 61 guided from the outside of the ceramic heater 4. As a structure of the tip side member 68, a cylindrical suction nozzle 62 is screwed onto the tip of the tip 63 provided at the tip of the protective pipe 66 (molded integrally with the tip of the tip 63). May be). A solder suction pipe 61 is provided so as to penetrate the tip tip 63 and communicate with the inner diameter side of the suction nozzle 62. The other end of the solder suction tube 61 is connected to a vacuum suction device (not shown).

  With such a configuration, heat generated by the ceramic heater 4 is transmitted to the tip of the suction nozzle 62 via the tip tip 63, and the solder in contact with the tip is melted. The molten solder is sucked and removed from the suction port 65 by vacuum suction.

  FIG. 9B shows the ceramic heater 4 with the solder suction pipe 71 passed through. As a structure of the tip side member 78, a tip tip 73 provided at the tip of the protection pipe 76 is provided with a through hole 72 penetrating the axis. A solder suction pipe 71 communicating with the through-hole 72 is connected to a vacuum suction device (not shown) through the ceramic heater 4.

  With such a configuration, the heat generated by the ceramic heater 4 is transmitted to the tip of the tip chip 73, and the solder in contact therewith is melted. The molten solder is sucked and removed from the suction port 75 by vacuum suction.

  Also in these solder heating devices, the structure of the tip side member 68 and the tip side member 78 is the same as that of the first embodiment, thereby reducing the rise time and the return time and suppressing the temperature drop. Can be obtained.

  Although the first to third embodiments have been described above, the present invention is not limited to these, and may be appropriately modified within the scope of the claims. For example, the connecting method of the tip side member and the main body side member does not have to be a structure using the O-ring as described above, and the design may be changed as appropriate.

It is a front view of the solder heating instrument (electrical soldering iron) which concerns on 1st Embodiment, (a) is a state with which the tip side member was hold | maintained at the main body side member, (b) is a tip side member. The state removed from the main body side member is shown. It is a fragmentary sectional view of Fig.1 (a). It is a conceptual diagram which shows the structure of the ceramic heater of the electric soldering iron which concerns on 1st Embodiment, (a) is a circuit structure of a ceramic heater, (b) is a ceramic heater formed by winding a ceramic green sheet around a ceramic rod. Indicates the state to be performed. It is a figure which shows the detailed structure of the tip tip of the electric soldering iron tip which concerns on 1st Embodiment, (a) is a fragmentary sectional view, (b) is III-III sectional drawing of (a), (c). These are enlarged views of the vicinity of the p and q parts in (a). FIGS. 5A and 5B are diagrams showing a modification of the detailed structure around the tip of the tip shown in FIG. 4, in which FIG. 4A corresponds to FIG. 4B and FIG. 4B corresponds to FIG. . It is explanatory drawing which compares the temperature characteristic of the electric soldering iron which concerns on 1st Embodiment with the temperature characteristic of the conventional electric soldering iron, (a) is the temperature characteristic of 1st Embodiment, (b) is a conventional structure. The temperature characteristic of the thing is shown. It is front sectional drawing of the solder heating instrument (gas ejection type electric soldering iron) which concerns on 2nd Embodiment, and shows the state by which inert gas is guide | induced to the tip side member from a main body side member. It is the elements on larger scale of FIG. It is a front fragmentary sectional view near the tip of the solder heating instrument (electrical solder suction iron) concerning a 3rd embodiment, (a) leads a solder suction pipe from the outside of a ceramic heater, (b) is ceramic This shows the solder suction tube inside the heater. The structure of the conventional soldering heater is shown, (a) is a partial front view, (b) is the exploded perspective view.

Claims (6)

A metal tip that melts in direct contact with the solder;
A temperature detector is provided in the vicinity of the tip, and a rod-like heater provided with a heat generating part on the base end side thereof, and includes a ceramic heater having a different coefficient of thermal expansion from the tip of the tip .
Inside the tip of the tip is provided a recess into which the ceramic heater is inserted in close contact,
The depth of the recess is equal to or more than the length from the tip of the ceramic heater to the heat generating part,
The portion forming the recess is provided with a notch that divides a cross section perpendicular to the axis in a plane including the axis of the recess from the opening to the vicinity of the bottom surface,
A cylindrical member covering the proximal end side of the tip of the tip is provided,
The tip of the tip is press-fitted into the cylindrical member at a position corresponding to the vicinity of the bottom surface of the recess, and in the other part, between the outer peripheral surface of the tip of the tip and the inner surface of the cylindrical member. There is a slight gap,
The cylindrical member is provided with a constricted portion in which at least a part of the outer peripheral surface of the cylindrical member is recessed inward at a position corresponding to the vicinity of the proximal end of the tip of the tip.
A tip side member for a solder heating instrument, characterized in that, in the throttle portion, the outer peripheral surface of the tip tip and the inner surface of the throttle portion are in contact with no gap.   2. The portion where the tip of the tip is press-fitted into the cylindrical member is configured to be a position corresponding to the temperature detecting portion of the inserted ceramic heater. Tip side member for solder heaters. The throttling portion is a planar step recessed inward from the outer peripheral surface of the cylindrical member, and a plurality of the tip portions are provided at positions that restrict the tip of the tip from spreading to both sides of the notch. The soldering iron tip side member according to claim 1 or 2.   The tip part for a solder heating apparatus according to claim 1 or 2, wherein the narrowed portion is obtained by reducing the diameter of the cylindrical member in a linear shape along the outer peripheral surface thereof.   5. A solder heating apparatus comprising: the solder heating apparatus tip side member according to claim 1, which is detachably provided on a main body side member that supports the solder heating apparatus tip side member. A gas introduction part provided in the main body side member for introducing an inert gas into the main body side member;
A gas ejection portion provided near the tip of the tip of the tip and ejecting the introduced inert gas;
A gas passage for introducing an inert gas from the gas introduction part to the gas ejection part,
A part of the gas passage is formed by a gap between the outer peripheral surface of the ceramic heater and the inner surface of the cylindrical member in the cut portion,
6. The solder heating apparatus according to claim 5, wherein the vicinity of the bottom surface of the recess is exposed from the cylindrical member to form the gas ejection portion.

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