JP2005040861A - Solder heating implement, and chip of its tip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solder heating implement economical in such a manner that only an inexpensive heating part can be replaced further, having satisfactory heat conductivity among a temperature detection part, a heater and a heating part, and free from time lag between the temperature measurement in the heating part and heating. <P>SOLUTION: The heating implement is provided with: a bar-shaped ceramic heater 2 generating heat for heating solder; a sleeve 3 consisting of a highly thermal conductive material, covering the circumference of the ceramic heater 2 and also tightly stuck to the ceramic heater 2; and a heating part 4 fitted exchangeably to the tip of the ceramic heater 2 and receiving heat from the sleeve 3 by being abutted on a heat transmitting face 3a provided on the tip of the sleeve 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a solder heating apparatus that generates heat for heating solder, such as an electric soldering iron.

  FIG. 20 is a cross-sectional view showing a configuration of a conventional solder heating device 50. As shown in FIG. 20, a conventional solder heating apparatus 50 that generates heat for heating solder, such as an electric soldering iron, covers and surrounds a rod-shaped heater 52 and the heater 52. A device including a sleeve 53 that is freely inserted and removed and a heating unit 54 that is integrated with the sleeve 53, such as a tip, is generally known.

  However, in this conventional solder heating apparatus 50, when the sleeve 53 is attached to the heater 52, the sleeve 53 is detachably fixed between the sleeve 53 and the heater 52 via an insert pipe 51 such as stainless steel. As a result of the existence of an air gap between the heater 52 and the heater 52, there is a problem in that heat transfer from the heater 52 to the heating portion 54 is not good and thermal efficiency is poor.

  In addition, due to the air gap and the high temperature atmosphere, when the solder heating device 50 is used for a long period of time, the sleeve 53 is eroded due to oxidation, and the heat transfer from the heater 52 to the heating unit 54 is deteriorated. There was a point.

  Furthermore, when the heating part 54 of the solder heating device 50 is worn out due to erosion due to solder or the like, in the conventional solder heating device 50 in which the heating unit 54 and the sleeve 53 are integrated, not only the heating unit 54 but also the sleeve 53 is provided. It had to be replaced and it was uneconomical.

  Therefore, various solder heating instruments have been proposed in order to improve these problems. For example, Patent Document 1 discloses a technique of an electric soldering iron in which a rod-shaped heater is inserted into a sleeve in which a heating unit can be divided, and the heater is bonded to the sleeve with an inorganic adhesive. .

Further, for example, Patent Document 2 includes a rod-shaped heater and a sleeve-shaped bit holder that covers the periphery of the heater and is detachably held by the heater, and includes a temperature sensor (temperature detector). A technique of a solder heating apparatus is disclosed in which an end portion of a heater including a heater is disposed in the bit holder, and a solder bit (heating portion) is detachably held on a free end portion of the bit holder. .
Japanese Utility Model Publication No. 2-53871 Japanese National Patent Publication No. 11-506054

  However, in the techniques of the solder heating apparatus disclosed in Patent Document 1 and Patent Document 2 described above, if the tip of the heating unit is worn out, only the inexpensive heating unit can be replaced, which is economical. However, since the heating part is only in contact with the free end of the sleeve, the heat transfer from the sleeve to the heating part is not improved so much, and the thermal efficiency as a solder heating device is still not good.

  In addition, since there is a distance between the temperature detection unit and the heater, and the heating unit, there is a time delay between the temperature measurement and heating of the heating unit. For this reason, the electric soldering iron techniques disclosed in Patent Document 1 and Patent Document 2 have a problem that an expensive control device such as a PID control device is required for temperature control.

  In addition, because there is a time delay between the temperature measurement and heating of the heating part, an excessive temperature rise of the heater was inevitable, so the temperature of the grip part must be increased or the length of the grip part must be increased. There was a problem that workability was not good.

  The present invention has been made in view of the above-mentioned problems, and is not only an economical soldering heater that can replace only an inexpensive heating unit, but also a heat transfer property between the temperature detection unit and the heater and the heating unit. It is an object of the present invention to provide a solder heating device that is good and that there is no time delay between temperature measurement and heating of the heating part.

  The present invention for solving the above problems includes a rod-shaped ceramic heater that generates heat for heating the solder, a sleeve made of a highly heat-conductive material, covering the ceramic heater, and closely contacting the ceramic heater. And a heating part that is exchangeably fitted to the tip of the ceramic heater and that transfers heat from the sleeve by contacting a heat transfer surface provided on the tip of the sleeve. It is a heating device.

  According to the present invention, since the heating unit is interchangeably fitted to the tip of the ceramic heater, even if the tip of the solder heating device is worn out, only the inexpensive heating unit can be replaced while the sleeve remains intact. It is good and it is economical without waste.

  Moreover, since the sleeve is in close contact with the ceramic heater so as to cover the periphery of the ceramic heater, the ceramic heater and the sleeve are thermally integrated. In addition, the heating part is not only in contact with the heat transfer surface provided on the front end surface of the sleeve, but is also fitted to the front end of the ceramic heater to increase the heat transfer area. And the ceramic heater are thermally integrated. As a result, the heat transfer from the ceramic heater to the heating part is good, and the thermal efficiency as a solder heating device is good.

  In addition, since the heat transfer from the ceramic heater to the heating part is good, it is not necessary to make the temperature of the ceramic heater excessively higher than the temperature of the heating part. Can be lowered. For the same reason, the length of the grip portion can be shortened. And from these things, workability | operativity of soldering is improved significantly.

  The ceramic heater integrally includes a heat generating part and a temperature detecting part, and the heat generating part and at least a part of the temperature detecting part are covered with the sleeve closely contacting the ceramic heater, and the temperature It is preferable that the temperature of the heating unit is controlled by a temperature control device that changes the energization amount of the heating unit based on the difference between the temperature measurement value by the detection unit and the temperature setting value for the heating unit.

  According to this preferable aspect, the ceramic heater integrally includes the heat generating portion and the temperature detecting portion, and among them, the heat generating portion and at least a part of the temperature detecting portion are provided by the sleeve that is in close contact with the ceramic heater. Since the periphery is covered, heat transfer between the temperature detection unit and the heat generation unit is good, and there is no time delay between temperature measurement and heating. As a result, it is possible to make the temperature control of the heating unit accurate with no time delay, such as suppressing an excessive temperature rise of the heating unit to a minimum.

  And, since the excessive temperature rise of the heat generating part can be suppressed to the minimum, the excessive temperature rise of the grip part can be further prevented. As a result, the workability of soldering is further improved, and there are fewer parts of the ceramic heater. The insulation of the heat generating part can be realized.

  The temperature detection unit is provided near the tip of the ceramic heater, and a part of the temperature detection unit is provided so as to protrude from the sleeve. The temperature detection unit protrudes from the sleeve. It is preferable that the recessed part which accommodates a part is provided.

  According to this preferable aspect, when the temperature detection unit and the heating unit are closer to each other, the heat transfer property between them can be further enhanced.

  In addition, a protrusion is provided on one of the heat transfer surface of the sleeve and the heat receiving surface of the heating portion that contacts the heat transfer surface, and a protrusion receiving portion that fits the protrusion is provided on the other. It is preferable that

  In this case, when the protrusion is provided on the heat transfer surface of the sleeve, the protrusion receiving portion is provided on the heat receiving surface of the heating portion. When the protrusion is provided on the heat receiving surface of the heating portion, the protrusion receiving portion is provided on the heat transfer surface of the sleeve. Will be provided.

  According to this preferable aspect, the heat transfer area between the sleeve and the heating portion can be further increased by fitting the protrusion and the protrusion receiving portion, and the heat transfer property can be further enhanced.

  Further, by providing the protrusion and the protrusion receiving portion at a position deviated from the axis of the heating part or the sleeve, the heating part can be positioned in the direction around the axis. Therefore, when it is necessary to provide the heating unit at a specific position around the axis with respect to the sleeve, positioning in the direction around the axis can be easily performed when replacing the heating unit.

  The sleeve is preferably provided with at least one slit extending substantially in the axial direction of the sleeve. It is preferable that at least one of the slits is an open-ended slit that extends over the entire length of the sleeve and that both ends thereof are open ends, and at least one of the slits is the above-described slit. It is preferable if the base end side of the ceramic heater is an open end and the other heating part side is a closed end slit which is a closed end.

  According to this preferred embodiment, for example, when a ceramic heater is press-fitted into a sleeve to bring them into close contact with each other, the pressure input can be reduced, so that productivity can be improved. Further, when the sleeve is subjected to a surface treatment such as plating, damage to the surface treatment can be suppressed by reducing the pressure input.

  As long as the slits have the same slit interval, the open-end slit can reduce pressure input more than the open-end slit.

  Further, the pressure input can be reduced as the number of slits is increased, but on the other hand, the contact area with the ceramic heater is reduced, so it is desirable to keep it at about two. When providing a plurality of slits, if the number of slits at both ends is two (or more), the sleeve before assembly is in a state of being divided in the axial direction. Therefore, an assembling process in which the ceramic heater is sandwiched between the divided pieces can be taken, and the ceramic heater and the sleeve can be brought into close contact with each other without being pressed. Such a manufacturing process can more reliably prevent damage to the surface treatment (plating or the like).

  On the other hand, when the number of open slits at both ends is one or less (for example, one open slit at both ends and one open slit at each end), the sleeve before assembly is not divided but integrated. Therefore, since it can be manufactured by a press-in process that is simpler than a process in which the ceramic heater is sandwiched between the sleeves divided as described above, productivity can be improved.

  Further, it is preferable that a holding tube made of a material that holds the outer peripheral surface of the sleeve and has a smaller coefficient of thermal expansion than the material of the sleeve is provided.

  According to this preferable aspect, even if the sleeve is expanded by heat, the expansion in the radial direction is suppressed by the holding tube having a smaller coefficient of thermal expansion than the sleeve. Therefore, the close contact state between the ceramic heater and the sleeve can be properly maintained even at a high temperature. At this time, if the slit is provided, it is more effective because the slit acts as an escape portion that absorbs thermal deformation of the sleeve. That is, the sleeve in which expansion in the radial direction is suppressed can be expanded in the circumferential direction so as to reduce the interval between the slits. Therefore, an increase in internal stress of the sleeve due to high temperature is suppressed, and breakage and deformation can be effectively prevented.

  The main material of the sleeve is preferably silver, copper, or a copper alloy.

  According to this preferable aspect, since the main material of the sleeve is silver, copper, or a copper alloy, as a result of the high thermal conductivity of the sleeve, the heat generating unit, the temperature detecting unit, and the heating unit are more efficiently heated. Can be integrated.

  Moreover, it is preferable that the said temperature control apparatus changes the electricity supply amount of the said ceramic heater by on-off control, and controls the temperature of a heating part.

  According to this preferable aspect, the temperature of the heating unit is controlled by a simple control such as on / off control. Therefore, the temperature control device becomes inexpensive and can contribute to the cost reduction of the solder heating apparatus. In the case of the on / off control, when the measured value falls below the set value of the temperature, since full energization is performed quickly, the temperature of the heating unit can be quickly recovered.

  The solder heater is a heater that constitutes a soldering iron, and includes a soldering iron body provided with the ceramic heater and a sleeve, and a tip as the heating unit. Preferably there is.

  According to this preferable aspect, since the solder heating instrument constitutes a soldering iron provided with a soldering iron body provided with a ceramic heater and a sleeve, and a heating tip as a heating unit, an inexpensive ironing tip is provided. It is not only an economical soldering iron that can be replaced, but also has good heat transfer from the temperature detector and heater to the tip, and there is no time delay between tip temperature measurement and heating. .

  The invention according to claim 12 is a tip of a solder heating device, wherein the heating portion according to any one of claims 1 to 11 is formed as the tip, and the ceramic heater and the sleeve are provided. It is characterized by being comprised so that replacement | exchange is possible with respect to the provided solder heating instrument main body.

  According to the present invention, even if the tip of the heating unit is worn out by use, the wear state of the tip can be eliminated by simply replacing the heating unit with the tip. The running cost can be greatly reduced while maintaining the effect.

  As described above, according to the present invention, not only is the economical soldering iron capable of replacing only an inexpensive heating unit, but also the heat transfer between the temperature detection unit and the heater and the heating unit is good. There is a remarkable effect that there is no time delay between temperature measurement and heating of the heating part.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is an outline view showing the configuration of a soldering iron 10 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the configuration of a soldering iron 10 according to an embodiment of the present invention. 3 is an exploded cross-sectional view showing the configuration of the soldering iron 10 according to the embodiment of the present invention, and FIG. 4 shows the configuration of the tip 4 of the soldering iron 10 according to the embodiment of the present invention. FIG. 4A is an outline view of the tip 4 as a heating unit viewed from the side, and FIG. 4B is an external view of the tip 4 viewed from the tip side. ) Respectively show outline views of the tip 4 viewed from the base end side.

  1 to 4 (mainly FIGS. 2 and 3), the main body of the soldering iron 10 according to the illustrated embodiment of the present invention generates heat at the tip of the casing 1 to heat the solder. A rod-shaped ceramic heater 2 is provided, and a sleeve 3 made of a high thermal conductivity material is provided at the tip of the ceramic heater 2 so as to cover the ceramic heater 2 and to be in close contact with the ceramic heater 2. .

  In addition, the soldering iron 10 according to the embodiment of the present invention receives heat from the sleeve 3 by contacting an annular heat transfer surface 3 a provided on the front end surface of the sleeve 3, and at the front end of the ceramic heater 2. And a temperature control device 5 for controlling the temperature of the tip 4 inside the casing 1.

  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 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.

  The ceramic heater 2 is a rod-shaped member made of ceramic provided to generate heat for heating the solder, and integrally includes a heat generating portion 2a and a temperature detecting portion 2b.

  Here, FIG. 5 is a conceptual diagram showing the configuration of the ceramic heater 2 of the soldering iron 10 according to the embodiment of the present invention, and (a) shows the circuit configuration of the ceramic heater 2. (B) shows a state in which the ceramic heater 2 is formed by winding the ceramic green sheet 2d around the ceramic rod 2e.

  As shown in FIGS. 5 (a) and 5 (b), the ceramic heater 2 is composed of a pattern of a heating resistor such as tungsten and a pattern of a temperature sensitive resistor such as tungsten provided in the temperature detection unit 2b. A green sheet 2d printed simultaneously is wound around a cylindrical ceramic rod 2e such as alumina or silicon nitride as a base, and is sintered and integrated.

  The sleeve 3 covers the periphery of the ceramic heater 2 and is in close contact with the ceramic heater 2 so that the heat generated in the heat generating portion 2a of the ceramic heater 2 is efficiently transferred to the tip 4 and the temperature detecting portion 2b. The main material is made of silver, copper, or a copper alloy with high thermal conductivity.

  When the material of the sleeve 3 is copper or a copper alloy, the surface of the sleeve 3 may be appropriately subjected to a surface treatment in order to prevent copper oxidation. For example, it is preferable that Ni plating is applied to the base and Cr plating is applied thereon, so that seizure due to heat can be prevented.

  Further, the sleeve 3 and the ceramic heater 2 are attached to the casing 1 by inserting the outer periphery of the sleeve 3 into a metal tubular holding tube 1 c extending from the casing 1.

  The holding tube 1c is made of a material (for example, stainless steel) having a smaller coefficient of thermal expansion than the sleeve 3.

  The iron tip 4 is for transferring the heat transmitted from the ceramic heater 2 and the sleeve 3 to an unillustrated solder in contact with the tip 4a to heat and melt the solder. As shown in FIGS. 4 (a), 4 (b), and 4 (c), 4 includes a recess 4b at the center on the base end side and a heat receiving surface 4c around the recess 4b. Further, the temperature detecting portion 2b is accommodated in the recess 4b, and the heat receiving surface 4c is formed in a shape capable of coming into contact with the annular heat transfer surface 3a provided on the tip surface of the sleeve 3.

  The tip 4 is mainly composed of a high thermal conductive material such as copper, and the surface of the tip 4 is iron-plated to prevent erosion due to solder, and the solder finish is also increased. In order to prevent this, chrome plating is applied. Instead of iron plating, the tip of the tip 4 may be covered with a cap made of iron or an iron alloy.

  2 and 3, the tip 4 is made of metal in which a locking portion 4 d provided at the peripheral edge on the proximal end side of the tip 4 is disposed around the ceramic heater 2. By engaging with the reduced diameter end portion 6 a of the tubular locking tube 6, the tubular locking tube 6 is brought into contact with an annular heat transfer surface 3 a provided on the distal end surface of the sleeve 3.

  The other end 6 b of the locking tube 6 is expanded and regulated by a regulating portion 7 a provided by reducing the diameter on the inner wall of the metal fastening ring 7, and the tip 4 is moved from the distal end surface of the sleeve 3. It is configured not to separate.

  The fastening ring 7 is provided with a screw portion 7b on the inner wall on the casing 1 side of the restricting portion 7a. The screw portion 7b is screwed to the screw portion 1b provided on the front end side of the casing 1. The fastening ring 7 is displaced toward the casing 1 so that the tip 4 is fastened to the ceramic heater 2 integrally.

  The temperature control device 5 controls the temperature of the tip 4 by changing the energization amount of the heat generating portion 2a based on the difference between the temperature measurement value by the temperature detection portion 2b and the temperature setting value for the tip 4. It is.

  As shown in FIG. 5A, the temperature control device 5 is connected to the temperature detection unit 2 b and the heat generation unit 2 a in the casing 1. Moreover, it is connected to the power source 8 through an electrical cord 1d (FIGS. 1 and 2) and an unillustrated outlet. Then, by inputting a potential difference corresponding to the temperature measurement value of the tip 4 from the temperature detector 2b, the temperature of the tip 4 is measured, and based on the difference between this temperature measurement value and the temperature set value. The energization amount of the heat generating portion 2a is changed by on / off control so that the temperature of the tip 4 is controlled to be equal to the temperature set value.

  Next, the periphery of the sleeve 3 and the tip 4 will be described in more detail. FIG. 6 is an enlarged cross-sectional view near the tip of the ceramic heater 2. As shown in this figure, the entire heat generating portion 2a of the ceramic heater 2 and most of the temperature detecting portion 2b are covered with the sleeve 3, but the tip of the temperature detecting portion 2b is slightly from the tip of the sleeve 3. It protrudes and enters the recess 4b of the tip 4. The penetration amount X is about 0.3 mm to 2.0 mm. The depth of the recess 4b is preferably about 1.5 mm to 5.0 mm, more preferably about 3 mm. The diameter of the recess 4b is about 3.8 mm to 4.4 mm.

  Thus, since the tip 4 and the temperature detection part 2b are provided in proximity, the heat transferability between them is enhanced.

  FIG. 7 is a diagram showing details of the sleeve 3, (a) is an enlarged perspective view of the sleeve 3, and (b) is a diagram for explaining a process of assembling the sleeve 3 to the ceramic heater 2.

  As shown in FIG. 7A, the sleeve 3 is provided with one open slit 3c that extends over the entire length in the axial direction and has open ends at both ends. In the present embodiment, in order to bring the ceramic heater 2 and the sleeve 3 into close contact with each other, a manufacturing process in which the ceramic heater 2 is press-fitted into the sleeve 3 is employed. Since the inner diameter of the sleeve 3 is easily expanded, the pressure input can be reduced and the productivity can be improved.

  Further, when the sleeve 3 is subjected to a surface treatment such as plating, it is possible to effectively suppress the damage of the surface treatment during the press-fitting by reducing the pressure input.

  After the ceramic heater 2 is press-fitted into the sleeve 3, the good contact state between the ceramic heater 2 and the sleeve 3 can be maintained by the restoring force of the sleeve 3.

  As shown in FIG. 7B, when the ceramic heater 2 is press-fitted into the sleeve 3, the sleeve 3 is placed on the jig 14 with the tip side facing downward. The jig 14 is formed with a jig recess 14a having substantially the same diameter as the ceramic heater 2 and having a predetermined depth (a depth corresponding to the amount of penetration of the tip 2c into the recess 4b). From the state shown in the drawing, the ceramic heater 2 can be produced with a stable press-fitting amount by press-fitting until the tip 2c hits the bottom of the jig recess 14a.

  FIG. 8 is a view showing a connection state between the sleeve 3 and the tip 4, (a) is an exploded front view of the vicinity of the tip of the sleeve 3 and the tip 4, and (b) is an arrow of (a). It is view II figure, (c) is the arrow III figure of (a). As shown in these drawings, the heat transfer surface 3a is provided with a protrusion 3b, and the heat receiving surface 4c is provided with a protrusion receiving portion 4e fitted to the protrusion 3b. By doing in this way, the heat transfer area of the sleeve 3 and the tip 4 can be further increased, and the heat transfer property can be further enhanced.

  Further, by providing the protrusion 3b and the protrusion receiving portion 4e at positions deviated from the axis of the sleeve 3 and the tip 4, the tip 4 can be easily positioned in the direction around the axis. For example, a ceramic heater 2 and two surrounding structures (including a sleeve 3 and a tip 4) are provided, and a solder heating apparatus of a type that sandwiches electronic components like tweezers (so-called tweezer type component attachment / detachment) In the apparatus or the like, it is necessary to fix the position around the axis of the tip 4 with respect to the main body at a predetermined position. In such a case, since the positioning can be performed by the protrusion 3b and the protrusion receiving portion 4e, when replacing the tip 4, the new tip 4 can be easily assembled at a predetermined position.

  Next, the operation of the soldering iron 10 according to the embodiment of the present invention will be described with reference to FIG.

  First, when the tip 4a of the tip 4 is worn out in the soldering iron 10 according to the embodiment of the present invention, the procedure for replacement with a new one is as follows. That is, referring to FIG. 3, by rotating the fastening ring 7 around the central axis of the soldering iron 10, the threaded portion 7 b of the fastening ring 7 and the threaded portion 1 b provided on the front end side of the casing 1 are moved. Loosen, displace the fastening ring 7 in the direction opposite to the casing 1 side, and remove it from the main body of the soldering iron 10.

  Further, the locking tube 6 is displaced in the direction opposite to the casing 1 and is extracted from the proximal end side of the locking tube 6 to expose the tip 4 and the sleeve 3. Then, the worn tip 4 is removed from the tip 2c of the ceramic heater 2, and a new one (tip tip for a solder heater) is fitted to the tip 2c of the ceramic heater 2 to replace the tip 4.

  Next, FIG. 9 is an explanatory diagram comparing the temperature control characteristics of the soldering iron 10 according to the embodiment of the present invention with the temperature control characteristics of a conventional soldering iron, and FIG. (B) shows the temperature control curve of the soldering iron 10 according to the embodiment of the present invention. In both soldering irons, the respective temperature control devices change the energization amount of the heat generating portion 2a of the ceramic heater 2 by on / off control, and the temperature of the tip 4 is set to 350 ° C. .

  Referring to FIG. 9A, in this conventional soldering iron, a soldering iron of the same type as the soldering iron disclosed in Patent Document 2 described above is used. Since this conventional soldering iron is not fitted to the tip of the ceramic heater 2 of the tip 4 and is only in contact with the free end of the sleeve 3, the transmission from the sleeve 3 to the tip 4 is performed. The thermal performance is not improved, the thermal efficiency as a soldering iron is not good, and it takes about 30 seconds from the start of energization to stabilization at the set temperature.

  In addition, since there is a distance between the temperature detection unit 2b and the heating unit 2a and the tip 4, there is a time delay between the temperature measurement and heating of the tip 4, and the heating unit 2a and the tip 4 An excessive temperature rise of about 10 ° C. occurs at the tip 4.

  Next, referring to FIG. 9 (b), the soldering iron 10 according to the embodiment of the present invention is merely in contact with the annular heat transfer surface 3 a provided on the front end surface of the sleeve 3. However, since it is fitted to the tip 2c of the ceramic heater 2, heat transfer between the temperature detector 2b and the tip 4 is good, and heat efficiency is good. Further, since the distances between the temperature detecting unit 2b and the heat generating unit 2a and the tip 4 are small, there is no time delay between the temperature measurement and the heating of the tip 4. As a result, it takes only about 15 seconds from the start of energization to stabilization at the set temperature. Further, there was almost no excessive temperature rise between the heat generating portion 2a and the tip 4, and only an overshoot of about 1 ° C. occurred at the tip 4.

  By the way, when the sleeve 3 is heated by the ceramic heater 2, the sleeve 3 is thermally expanded. However, the outer diameter side of the sleeve 3 is regulated by the holding tube 1c, and the thermal expansion of the holding tube 1c is smaller than the thermal expansion of the sleeve 3, so that the expansion of the sleeve 3 in the radial direction is suppressed. Therefore, the close contact state between the ceramic heater 2 and the sleeve 3 can be properly maintained even in a high temperature state. Furthermore, both ends open slit 3c is more effective because it acts as a relief portion that absorbs thermal deformation of the sleeve 3. That is, the sleeve 3 in which the expansion in the radial direction is suppressed can be expanded in the circumferential direction so as to reduce the slit interval of the both-end open slit 3c. Accordingly, an increase in internal stress of the sleeve 3 due to high temperature is suppressed, and breakage and deformation can be effectively prevented.

  As described above, according to the soldering iron 10 according to the embodiment of the present invention, the tip 4 is interchangeably fitted to the tip of the ceramic heater 2, so the tip of the soldering iron 10. Even when the sleeve wears out, it is only necessary to replace the inexpensive tip 4 with the sleeve 3 as it is, which is economical and economical.

  Further, since the sleeve 3 is in close contact with the ceramic heater 2 so as to cover the periphery of the ceramic heater 2, the ceramic heater 2 and the sleeve 3 are thermally integrated. Further, the tip 4 is not only in contact with the annular heat transfer surface 3a provided on the front end surface of the sleeve 3, but is also fitted to the front end of the ceramic heater 2 to increase the heat transfer area. Therefore, the tip 4, the sleeve 3, and the ceramic heater 2 are thermally integrated. As a result, the heat transfer from the ceramic heater 2 to the tip 4 is good, and the thermal efficiency as a soldering iron is good.

  Further, since the heat transfer from the ceramic heater 2 to the tip 4 is good, it is not necessary to make the temperature of the ceramic heater 2 excessively higher than the temperature of the tip 4, and as a result, compared with the conventional soldering iron 10 Thus, the temperature of the grip portion 1a can be lowered. For the same reason, the length of the grip portion 1a can be shortened. And from these things, workability | operativity of soldering is improved significantly.

  Further, according to the soldering iron 10 according to the embodiment of the present invention, the ceramic heater 2 integrally includes the heat generating part 2a and the temperature detecting part 2b, and these heat generating part 2a and temperature detecting part 2b. However, since the periphery is covered with the sleeve 3 that is in close contact with the ceramic heater 2, heat transfer between the temperature detection unit 2b and the heat generation unit 2a is good, and there is no time delay between temperature measurement and heating. As a result, the temperature control of the tip 4 can be made accurate with no time delay, such as suppressing an excessive temperature rise of the heat generating portion 2a.

  And since the excessive temperature rise of the heat generating part 2a can be suppressed to the minimum, as a result of further preventing the excessive temperature rise of the grip part 1a, the workability of soldering is further improved. Insulation of the heat generating portion 2a can be realized with a small number of members.

  In addition, since the main material of the sleeve 3 is silver, copper, or a copper alloy, as a result of the high thermal conductivity of the sleeve 3, the heat generating portion 2a, the temperature detecting portion 2b, and the tip 4 are more efficiently connected. It can be integrated thermally.

  Further, the pressure input when the ceramic heater 2 is press-fitted into the sleeve 3 by the both-end open slit 3c is reduced, and damage to the surface treatment is suppressed. Further, it is possible to prevent an increase in the internal stress of the sleeve 3 while maintaining the close contact state between the ceramic heater 2 and the sleeve 3 even if the thermal expansion occurs.

  Further, since the temperature of the tip 4 is controlled by a simple control such as on / off control, the temperature control device 5 becomes inexpensive and can contribute to the cost reduction of the soldering iron 10. In the case of the on / off control, when the measured value is lower than the set value of the temperature, full energization is performed quickly, so that the temperature of the tip 4 can be quickly recovered.

  As described above, according to the soldering iron 10 according to the embodiment of the present invention, the soldering iron main body provided with the ceramic heater and the sleeve and the tip as the heating unit are provided. It is not only an economical soldering iron that can replace only an inexpensive iron tip, but also has good heat transfer from the temperature detector and heater to the iron tip. There is no time delay.

  The above-described embodiment is merely a preferred specific example of the present invention, and the present invention is not limited to the above-described embodiment.

  For example, the sleeve 3 according to the embodiment of the present invention is not limited to the one provided with one both-end open slit 3c as shown in FIG. For example, as shown in FIG. 10A, a sleeve 3 'having a structure having two open slits 3c at both ends may be used. The sleeve 3 'is composed of the same sleeve divided pieces 3e and 3f having a substantially semicircular annular cross section. Then, the ceramic heater 2 is brought into close contact with each other by the respective inner circular arc portions 3g substantially coinciding with the outer diameter of the ceramic heater 2. A chamfered portion 3h is formed on the sleeve divided pieces 3e, 3f on the side opposite to the heat transfer surface 3a '.

  FIGS. 10B and 10C are diagrams showing a manufacturing process for assembling the sleeve 3 ′ shown in FIG. 10A to the ceramic heater 2. First, as shown in FIG. 10 (b), the ceramic heater 2 is installed on the jig 14 with the tip 2c facing downward. The jig 14 is formed with a jig recess 14a having substantially the same diameter as the ceramic heater 2 and having a predetermined depth (a depth corresponding to the amount of penetration of the tip 2c into the recess 4b). The ceramic heater 2 is sandwiched between the sleeve divided piece 3e and the sleeve divided piece 3f so that the heat transfer surface 3a 'of the sleeve 3' is along the upper surface of the jig 14. Thereafter, as shown in FIG. 10C, the holding tube 1c is press-fitted from above. The chamfered portion 3h serves as a guide for smoothly press-fitting the holding tube 1c. Thus, the ceramic heater 2 is assembled in a state in which an appropriate amount protrudes from the tip of the sleeve 3 and two open slits 3c are formed.

  By performing such an assembling process, the surface of the ceramic heater 2 and the inner diameter portion of the 3 'can be assembled without any friction. Therefore, it is possible to reliably prevent damage to the surface treatment of the sleeve 3 '.

  Further, as shown in FIG. 11, a sleeve 3 '' having one open slit 3c and one open slit 3d may be used. FIG. 11A is a front view of the sleeve 3 ″, FIG. 11B is a right side view, and FIG. 11C is a rear view. As shown in the drawing, the front side of the sleeve 3 ″ extends in the axial direction, the base end side (the left side of the figure (a)) of the ceramic heater 2 is an open end, and the heat transfer surface 3a ″ side is closed. One end open slit 3d which is an end is provided. A single open slit 3c is provided on the back side of the sleeve 3 ''.

  According to the sleeve 3 '' having the two slits 3c and 3d, the pressure input is further reduced and the surface treatment is damaged as compared with the sleeve 3 of the above-described embodiment having only one open-ended slit 3c. Can be further suppressed. Further, since the sleeve 3 ″ is not divided, it can be integrated with the ceramic heater 2 by a simple press-fitting process while being integrated.

  12-16 shows the modification of the protrusion 3b of the heat-transfer surface 3a, and the protrusion receiving part 4e of the heat-receiving surface 4c. FIG. 12A is an exploded front view showing the first modification, FIG. 12B is an arrow IV view of FIG. 12A, and FIG. 12C is an arrow V view of FIG. As shown in these figures, the heat transfer surface 3a is provided with three protrusions 3b 'arranged in a T-shape, and the heat receiving surface 4c has three protrusion receiving portions that fit into the protrusions 3b'. 4e 'is provided.

  FIG. 13A is an exploded front view showing a second modification of the protrusion 3b of the heat transfer surface 3a and the protrusion receiving portion 4e of the heat receiving surface 4c, and FIG. 13B is a VI view of FIG. (C) is the arrow VII figure of (a). As shown in these drawings, the heat transfer surface 3a is provided with a D-shaped protrusion 3b ″ along a part of the outer periphery of the heat transfer surface 3a, and the heat receiving surface 4c is fitted to the protrusion 3b ″. A mating projection receiving portion 4e '' is provided.

  FIG. 14 is a view showing a third modification of the protrusion 3b of the heat transfer surface 3a and the protrusion receiving portion 4e of the heat receiving surface 4c, (a) is a view showing the tip 4a surface, and (b) the sleeve 3 is shown. It is a front view which shows the front-end | tip vicinity. As shown in these drawings, the heat transfer surface 3a is provided with one protrusion 3b '' ', and the heat receiving surface 4c is provided with a protrusion receiving portion 4e' 'fitted to the protrusion 3b' ''. 'Is provided. Since a part of the protrusion 3 b ″ ″ is in contact with the ceramic heater 2, heat transfer from the ceramic heater 2 to the tip 4 is further improved.

  Two projections 3b ′ ″ and projection receiving portions 4e ′ ″ may be provided as shown in FIGS. 15 (a) and 15 (b), and 3 as shown in FIGS. 16 (a) and 16 (b). Individual pieces may be provided.

  In each of the above modifications, the projection 3b ′ and the like are provided on the heat transfer surface 3a side, and the projection receiving portion 4e ′ and the like are provided on the heat reception surface 4c side, but conversely on the heat transfer surface 3a side. A protrusion receiving portion 4e ′ or the like may be provided, and a protrusion 3b ′ or the like may be provided on the heat receiving surface 4c side.

  In any of the above modifications, the effect of increasing the heat transfer area by increasing the heat transfer area and the effect of facilitating the positioning of the tip 4 can be obtained as in the case of the protrusion 3b and the protrusion receiving portion 4e of the above embodiment. it can.

  Further, the ceramic heater 2 may be configured not to protrude from the tip of the sleeve 3. FIG. 17 shows a structure in which the tip of the sleeve 3 and the tip of the ceramic heater 2 are flush with each other and come into contact with the flat heat receiving surface 4c 'of the tip 4'. In this way, the processing of the recess 4b in the tip 4 'can be omitted, and the productivity can be improved. Further, good heat transfer from the sleeve 3 or the ceramic heater 2 to the heat receiving surface 4c 'can be ensured.

  Furthermore, the soldering iron 10 according to the embodiment of the present invention is not necessarily limited to the shape of the soldering iron as illustrated.

  FIG. 18 is a cross-sectional view showing a second embodiment of the soldering iron according to the embodiment of the present invention. As shown in the figure, in the soldering iron 20 according to the second embodiment, a tip 24 includes a suction pipe 24a whose one end is connected to a vacuum suction device (not shown), and other suction pipes 24a. A nozzle 24b provided at the end is provided at the tip. According to the soldering iron 20 according to the second embodiment, the solder heated and melted at the tip of the nozzle 24b of the tip 24 is pneumatically transported to the vacuum suction device through the nozzle 24b and the suction pipe 24a. Will be able to. The heat from the ceramic heater 2 is transmitted to the sleeve 23, and further transmitted from the heat transfer surface 23a to the tip 24 via the heat receiving surface 24c.

  FIG. 19 is a sectional view showing a third embodiment of the soldering iron according to the embodiment of the present invention. As shown in the drawing, in the soldering iron 30 according to the third embodiment, the suction pipe 34a is connected to a vacuum suction device (not shown) and heated and melted at the tip of the nozzle 34b of the tip 34. The point that the solder can be pneumatically transported to the vacuum suction device via the nozzle 34b and the suction pipe 34a is the same as that of the second embodiment, but in the third embodiment, The suction pipe 34 a is configured to receive the solder melted by heating from the nozzle 34 b provided on the tip 34 while being inserted into the tubular ceramic heater 2.

  As described above, as the soldering iron according to the embodiment of the present invention, the rod-shaped ceramic heater 2 that generates heat for heating the solder and the high thermal conductivity material covers the periphery of the ceramic heater 2, and The sleeve 3 that is in close contact with the ceramic heater 2 is exchangeably fitted to the tip of the ceramic heater 2 and receives heat from the sleeve 3 by coming into contact with the heat transfer surface 3a provided on the tip surface of the sleeve 3. If the soldering iron is provided with the iron tip 4, various design changes are possible.

  Moreover, the heat generating part 2a of the ceramic heater 2 is not limited to tungsten or the like. As long as it is configured to generate heat, various design changes can be made, such as using other materials.

  The sleeve 3 does not necessarily need to be made of silver, copper, or a copper alloy as a main material. Covers the periphery of the ceramic heater 2 and is in close contact with the ceramic heater 2 to efficiently transmit the heat generated in the heat generating portion 2a of the ceramic heater 2 to the tip 4 and the temperature detecting portion 2b without time delay. If it is a thing, another highly heat conductive material is employable.

  In addition, the casing 1, the grip portion 1a, the locking tube 6, the fastening ring 7, the electric cord 1d, and the like do not limit the present invention and are not essential. Or various design changes are possible.

  In addition, it goes without saying that various design changes are possible within the scope of the claims of the present invention.

1 is an external view showing a configuration of a soldering iron according to an embodiment of the present invention. It is sectional drawing which shows the structure of the soldering iron which concerns on embodiment of this invention. It is a disassembled sectional view which shows the structure of the soldering iron which concerns on embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is an external view which shows the structure of the tip of the soldering iron which concerns on embodiment of this invention, (a) is the external view which looked at the tip from the side, (b) is the tip. (C) has shown the external view which looked at the tip from the base end side, respectively. It is a conceptual diagram which shows the structure of the ceramic heater of the soldering iron which concerns on embodiment of this invention, (a) has shown the circuit structure of the ceramic heater. (B) shows a state in which a ceramic heater is formed by winding a ceramic green sheet around a ceramic rod. It is an expanded sectional view near the front-end | tip part of a ceramic heater. It is a figure which shows the detail of a sleeve, Comprising: (a) is an expansion perspective view of a sleeve, (b) is a figure explaining the process of assembling a sleeve to a ceramic heater. It is a figure which shows the connection state of a sleeve and a tip, (a) is a disassembled front view of the tip vicinity of a sleeve and a tip, (b) is an arrow II figure of (a), (c ) Is an arrow view III of (a). It is explanatory drawing which compares the temperature control characteristic of the soldering iron which concerns on embodiment of this invention with the temperature control characteristic of the conventional soldering iron, (a) is the temperature control curve of the conventional soldering iron, ( b) shows the temperature control curves of the soldering iron according to the embodiment of the present invention. It is a figure which shows the sleeve of a structure provided with two both-ends open slits, (a) is a perspective view of the sleeve, (b), (c) assembles the sleeve shown in (a) to a ceramic heater It is a figure which shows a manufacturing process. It is a figure which shows the sleeve of a structure provided with one both ends open slit and one one end open slit, (a) is a front view of this sleeve, (b) is a right view, (c) is a rear view. is there. (A) is a decomposition | disassembly front view which shows the 1st modification of the protrusion of a heat-transfer surface and the protrusion receiving part of a heat receiving surface, (b) is an arrow IV figure of (a), (c) is ( It is an arrow V figure of a). (A) is a decomposition | disassembly front view which shows the 2nd modification of the protrusion of a heat-transfer surface and the protrusion receiving part of a heat receiving surface, (b) is an arrow VI figure of (a), (c) is ( It is arrow VII figure of a). It is a figure which shows what provided one protrusion in the 3rd modification of the protrusion of a heat-transfer surface and the protrusion receiving part of a heat receiving surface, (a) is a figure which shows a front end surface, (b) Near the front-end | tip of a sleeve FIG. It is a figure which shows what provided two protrusions in the 3rd modification of the protrusion of a heat-transfer surface and the protrusion receiving part of a heat receiving surface, (a) is a figure which shows a front end surface, (b) Near the front-end | tip of a sleeve FIG. It is a figure which shows what provided three protrusions in the 3rd modification of the protrusion of a heat-transfer surface and the protrusion receiving part of a heat-receiving surface, (a) is a figure which shows a front end surface, (b) Near the front-end | tip of a sleeve FIG. A modification is shown in which the tip of the sleeve and the tip of the ceramic heater are flush with each other and come into contact with the flat heat receiving surface of the tip. It is sectional drawing which shows the soldering iron which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the soldering iron which concerns on 3rd Embodiment of this invention. It is sectional drawing which shows the structure of the conventional soldering iron.

Explanation of symbols

1 Casing (soldering iron body, soldering heater body)
1c Holding tube 2 Ceramic heater 2a Heat generation part 2b Temperature detection part 3, 3 ', 3''Sleeve 3a, 3a', 3a '' Heat transfer surface 3b, 3b ', 3b'',3b''' Projection 3c Open both ends Slit 3d One-end open slit 4, 4 'Tip (heating part, tip for soldering heater)
4b Recessed part 4c, 4c ′ Heat receiving surface 4e, 4e′4e ″, 4e ′ ″ Protrusion receiving part 5 Temperature controller 10 Soldering iron (solder heating instrument)
20 Solder blotter (solder heater)
23 Sleeve 23a Heat transfer surface 24 Tip (heating part, tip for solder heater)
30 Solder blotter (solder heater)
34 Tip (Heating section, tip for solder heating equipment)

Claims (12)

A rod-shaped ceramic heater that generates heat to heat the solder;
A sleeve made of a high thermal conductivity material, covering the periphery of the ceramic heater, and in close contact with the ceramic heater;
Solder heating, comprising: a heating portion that is exchangeably fitted to the tip of the ceramic heater and that transfers heat from the sleeve by contacting a heat transfer surface provided on the tip surface of the sleeve Instruments. The ceramic heater has an exothermic part and a temperature detecting part integrally,
The heat generating portion and at least a part of the temperature detecting portion are covered with the sleeve that is in close contact with the ceramic heater,
The temperature of the heating unit is controlled by a temperature control device that changes an energization amount of the heating unit based on a difference between a temperature measurement value by the temperature detection unit and a temperature setting value for the heating unit. Item 1. A solder heating apparatus according to item 1. The temperature detection unit is provided near the tip of the ceramic heater, and a part of the temperature detection unit is provided so as to protrude from the sleeve,
The solder heating apparatus according to claim 2, wherein the heating unit is provided with a recess for accommodating the temperature detection unit protruding from the sleeve.   One of the heat transfer surface of the sleeve and the heat receiving surface of the heating portion that contacts the heat transfer surface is provided with a protrusion, and the other is provided with a protrusion receiving portion that fits the protrusion. The solder heating instrument according to any one of claims 1 to 3, wherein the solder heater is provided.   The solder heating device according to any one of claims 1 to 4, wherein the sleeve is provided with at least one slit extending in a substantially axial direction of the sleeve.   6. The solder heating apparatus according to claim 5, wherein at least one of the slits is a both-end open slit extending over the entire length of the sleeve and having both ends open.   7. The solder according to claim 5, wherein at least one of the slits is a one-end open slit in which the base end side of the ceramic heater is an open end and the other heating unit side is a closed end. Heating equipment.   The solder heating according to any one of claims 1 to 7, further comprising a holding tube that holds the outer peripheral surface of the sleeve and is made of a material having a smaller coefficient of thermal expansion than the material of the sleeve. Instruments.   The solder heating apparatus according to any one of claims 1 to 8, wherein a main material of the sleeve is silver, copper, or a copper alloy.   10. The solder heating according to claim 2, wherein the temperature control device controls the temperature of the heating section by changing an energization amount of the ceramic heater by on / off control. Instruments.   11. A heating apparatus constituting a soldering iron, comprising: a soldering iron main body provided with the ceramic heater and a sleeve; and a tip as the heating unit. The solder heating instrument according to any one of the above.   A tip for a solder heater, wherein the heating section according to any one of claims 1 to 11 is replaced with the tip and the solder heater main body including the ceramic heater and the sleeve is replaced. A tip for a solder heating device, characterized in that it is configured.

Images