JP2017037768A - Adapter and micro heater having the same, and mounting structure thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adapter and micro heater having the same, mounting structure thereof, which is capable of facilitating fixing onto a member-to-be-mounted with a plane or a curve surface of a rail or piping, for example, excellent in mountability and capable of preventing breakage to a micro heater caused by spin or twist while mounting or after mounting.SOLUTION: An adapter 4, which is provided in a micro heater 1 with a sheath heater 3 storing a heating wire in a sheath and a lead wire 6 connected with the heating wire led out of an end of the sheath heater 3 and which stores the end of the sheath heater 3 and a connection portion of the lead wire 6 connected with the heating wire led out of the end, includes a portion 8 with a cross section of different type from that of the body of the adapter, at a part of a position located in such a direction as to reach the lead wire 6 from a boundary part to the sheath heater 3.SELECTED DRAWING: Figure 2

Description

  The present invention is an adapter that can be easily fixed to a mounted member having a flat surface or curved surface such as a rail or a pipe, has excellent mounting properties, and prevents damage to the microheater due to rotation or twisting during and after mounting. The present invention also relates to a micro heater having the adapter and a mounting structure thereof.

  A microheater has a flexible structure in which a heating wire is covered with a metal sheath through an inorganic insulator such as magnesium oxide, and a terminal portion is attached to the end portion thereof to prevent snow melting or freezing of rails and piping, etc. It is used for heating of heating devices. The structure of the microheater used for such applications includes, for example, a heating portion of a sheath heater having a heating element such as a metal sheath and a heating wire, a lead wire for connecting to the heating portion, and the heating portion and the lead wire. In order to connect between them, there is known one having a sleeve or an adapter having a diameter larger than that of the heat generating portion and a moisture-proof end thereof (for example, see Patent Documents 1 and 2).

  As disclosed in Patent Document 3, the microheater having the above structure is used as a heating jig for an electric snow melting device in a branching portion used as a heating jig.

  Further, Patent Document 4 proposes an attachment device for attaching a magnet to an attachment device made of an elastic material so that the attachment work can be easily performed when attaching a heater as a rail heating plate to a rail as an attachment material. In addition, a heater having a rectangular cross section is disclosed as a heater to be used.

  Further, Patent Document 5 proposes a fixing structure for preventing the sheath heater from rotating and moving in the axial direction. The sheath heater described in Patent Document 5 is obtained by flattening only the engaging portion that engages with the fixing jig.

JP-A-2005-174582 JP 2003-142235 A Japanese Patent Laid-Open No. 2001-90001 Japanese Patent Laid-Open No. 10-8401 JP 2002-216939 A

  When the microheater having the adapter (or sleeve) is attached to a member to be attached such as a rail, piping, or heating device, the adapter (or sleeve) with the lead portion may be artificially rotated. Many. In that case, the thick adapter (or sleeve) is not damaged, but the microheater is fixed with the support bracket, so the rotation of the adapter (or sleeve) causes the problem that only the root of the microheater rotates and breaks. . Therefore, the microheater having an adapter (or sleeve) is not only easy to fix to the mounted member and excellent in mountability but also has a structure capable of preventing damage to the microheater due to rotation and twisting during and after mounting. Things are strongly sought after.

  However, Patent Documents 1 to 3 do not recognize the technical problem of damage due to rotation or twisting that occurs at the time of mounting the mounted member and after the mounting. Or the structure of the adapter could not overcome such a technical problem.

  Further, the heaters described in Patent Documents 4 and 5 only have a structure of a heat heater having a sheath heater of a micro heater, that is, a metal sheath and a heating element such as a heating wire, and have the adapter (or sleeve). The structure of the microheater is not specifically described. In addition, there is no mention of focusing on the structure of the adapter (or sleeve) of the microheater in order to overcome the technical problem of breakage of the microheater due to rotation or twist. Accordingly, it is difficult to conceive from the inventions described in Patent Documents 4 and 5 a structure for overcoming the above technical problem with respect to a microheater having an adapter (or sleeve) structure.

  The present invention has been made in view of the above circumstances. For example, it is easy to fix to a mounted member having a flat surface or curved surface such as a rail or a pipe, has excellent mounting properties, and is rotated or twisted during and after mounting. An object of the present invention is to provide an adapter for preventing breakage of a microheater, a microheater having the adapter, and a mounting structure thereof.

  As a result of intensive studies to solve the above problems, the present inventors have paid attention to the structure of the adapter provided in the microheater and can solve the above problems by adopting a new structure different from the conventional one. I found out.

  That is, the present invention is provided in a microheater having a sheath heater in which a heating wire is housed in a sheath and a lead wire connected to the heating wire led out from the end portion of the sheath heater, and the end portion of the sheath heater and the end portion thereof. The lead wire connecting portion connected to the heating wire led out from the portion is housed, and the attachment contact of the member to be attached is partly located in the direction from the boundary portion with the sheath heater to the lead wire. The adapter is provided with a portion having a cross section different from the cross section of the main body of the adapter according to the surface shape.

  As a portion having a cross section having a shape different from the cross section of the main body of the adapter, it matches the shape of the contact surface of the attached member when the micro heater is attached to the attached member, and extends from the boundary portion with the sheath heater to the lead wire. In a part of the cross section of the portion located in the reaching direction, one having at least one irregular shape selected from a flat portion, a flat portion, a corner portion, a concave portion and a convex portion is formed.

  According to the adapter structure of the present invention, the boundary with the sheath heater and the vicinity thereof in the adapter are fixed in accordance with the shape of the contact surface of the attached member, so that the adapter portion is not only easily fixed, but also becomes strong. . Due to this action, the rotation and twisting of the microheater during and after mounting can be suppressed, and not only the mounting operation of the microheater is facilitated, but also damage to the microheater can be prevented. In addition, after temporarily fixing by attaching to the attached member, the adapter part can be temporarily fixed easily in the operation of fixing the micro heater to the attached portion using the installation fixing jig. Efficiency can be improved.

  Further, the present invention is a microheater having a sheath heater in which a heating wire is housed in a sheath, a lead wire connected to a heating wire led out from an end portion of the sheath heater, and the adapter, The cross section has a flat shape. This not only provides a synergistic effect on the rotation and twist of the microheater, but also improves heat transfer to the mounted member, so that the mounted member can be efficiently heated. it can.

  Moreover, the microheater of the present invention is characterized in that two heating wires are accommodated in a sheath. Since the micro heater having this structure can be configured by a single portion corresponding to the sheath heater, the micro heater can be reduced in size and weight. In addition, since the sheath heater is bent to have an arbitrary shape, it is easy to be routed when the sheath heater is attached to the member to be attached.

  Further, in the present invention, when the adapter has a portion having a cross section different from the cross section of the main body and the contact surface between the sheathed heater and the attached member as a line L simulating the long axis direction of the microheater, On the line L, the distance between the portion of the adapter having a cross section different from the cross section of the main body and the point where the sheath heater is separated from the contact surface with the mounted portion is the outer diameter or thickness of the sheath heater. This is a micro heater mounting structure that is mounted within the specified range. With this mounting structure, the sheath heater can suppress the floating from the mounted member, and the temperature of the raised portion of the micro heater can be prevented from rising abnormally, so that the temperature of the mounted member can be adjusted appropriately. Become. Furthermore, since deterioration due to abnormal temperature rise is suppressed, the life of the micro heater can be extended.

  According to the present invention, for example, it is easy to fix to a mounted member having a flat surface or curved surface such as a rail or a pipe, has excellent mounting properties, and prevents damage to the microheater due to rotation or twisting during and after mounting. Can do. Furthermore, since the heating performed after attachment of the attached member can be performed efficiently and appropriately, it is excellent in usability as a micro heater, and appropriate temperature adjustment by preventing abnormal heating and improvement of the durability of the micro heater are achieved. be able to.

It is a figure which shows the example of the 2 core micro heater which comprises the adapter of this invention. It is a figure which shows the example when attaching the micro heater of this invention to a rail. It is a figure which shows the example when attaching the micro heater of this invention to the outer side of piping. It is a figure which shows the example of the cross-sectional shape of the adapter of this invention as sectional drawing of the state which contacted the to-be-attached member. It is a figure which shows the example of the attachment structure of the adapter of this invention. It is a figure which shows the modification of the 2 core micro heater which comprises the adapter of this invention. It is a figure which shows an example of the 1 core micro heater which comprises the adapter of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail. However, the present invention is not limited to the following embodiments.

<Embodiment 1>
FIG. 1 is a diagram showing an example of a two-core microheater equipped with the adapter of the present invention. FIG. 1A is a plan view of the two-core microheater 1, and the lower part of the plan view shows an enlarged view of the cross section of each part A, B, and C of the two-core microheater 1. FIG. FIG. 1B is an enlarged perspective view of the connection portion between the sheath heater 3 and the adapter 4 in the two-core microheater 1 as seen from the lower part of the adapter 4.

  As shown in FIG. 1, the two-core microheater 1 includes a sheath heater 3 having two heating wires 2 inside, an adapter portion composed of an adapter 4 and a terminal adapter 5, and a lead wire 6. Two of the lead wires 6 are connected to two of the heating wires 2 led out from the end of the sheath heater inside the adapter 4 and the terminal adapter 5, respectively. The end portion on the sheath heater 3 side and the connecting portion of the lead wire 6 connected to the heating wire led out from the end portion are housed inside the adapter portion.

  The adapter portion shown in FIG. 1A is composed of two parts, an adapter 4 and a terminal adapter 5, but in this embodiment, the adapter 4 and the terminal adapter 5 are integrated and have the same cross-sectional diameter. It is good also as one adapter structure which has these. Further, the adapter part is not limited to one or two parts as shown in FIG. 1, and can have a structure composed of three or more parts. In the present invention, an adapter portion composed of two or more parts also basically has the same function as the adapter 4 and therefore is defined as an adapter in a lump as in the case of one.

  As shown in FIGS. 1A and 1B, the adapter 4 has a cross section of the main body of the adapter 4 in a part of the portion located in the direction from the boundary portion 7 with the sheath heater 3 to the lead wire 6. A portion 8 having an irregular cross section is provided. That is, the portion 8 having an irregular cross section has a shape in which a part of the circle is cut into a flat shape (BB), unlike the circular cross section of the main body of the adapter 4 (see the CC cross section). (See cross-sectional view).

  As described above, the adapter 4 according to the present embodiment, unlike the conventional microheater, may have a portion 8 having a cross section having a shape different from that of the main body of the adapter 4 near the boundary portion 7 with the sheath heater 3. It is a big feature. Conventional micro heaters generally have a structure in which the entire adapter has a circular cross section, as disclosed in Patent Documents 1 to 3.

  FIG. 2 shows an example in which a micro heater having an adapter according to the present embodiment is attached to a rail. 2A is a view when the rail 9 is viewed from the side, and FIG. 2B is a cross-sectional view taken along the line DD of the rail 9. As shown in FIG. 2, the microheater 1 is attached to the rail bottom 10 and is used to obtain a snow melting effect against snowfall, carry-in snow, snowfall, etc. by electrically heating the microheater 1 and heating the rail 9. For example, it is applied as a snow melting jig such as a railroad rail. Here, the electric heat of the microheater 1 is performed through two lead wires 6 connected to the sheath heater 3 inside the adapter portion including the adapter 4 and the terminal adapter 5, and is electrically controlled.

  As shown in FIG. 2B, the microheater 1 has a portion 8 in which a partial cross section of the adapter 4 has a cross section different from the main body cross section (circular cross section) of the adapter 4. The portion is formed in a flat shape so as to follow the shape of the oblique substantially flat portion 11 of the rail bottom portion 9. This 8 portion can be pressed against the obliquely flat portion 11 of the rail bottom portion 9 so that the adapter 4 does not move. Thereafter, the adapter 4 can be prevented from rotating by fixing the microheater 1 using the mounting bracket 12 for mounting, so that the problem that only the root of the microheater 1 rotates and breaks does not occur.

  On the other hand, in place of the microheater 1 according to the present embodiment, when a conventional microheater having a circular cross section is used, the adapter base moves or rotates during or after installation. As a result, it is not only impossible to securely fix, but there are cases in which scratches are observed at the base of the microheater. In the worst case, the micro heater is damaged.

  The mounting example shown in FIG. 2 uses a microheater in which a portion 8 having a different-shaped cross section is formed on a part of the adapter 4, but in this embodiment, not only the adapter 4 but also the terminal adapter 5. Alternatively, a portion having a cross section different from the cross section of the adapter main body may be formed. The portion 8 having a cross-section with an irregular shape is an adapter depending on the length when the micro heater 1 is attached to the rail bottom 10 and the position when the adapter portions 4 and 5 are separated from the rail bottom 10. 4 or both adapter 4 and terminal adapter 5 can be provided. Further, the portion 8 having an irregular cross section provided in a part of the adapter 4 is not limited to a flat shape. For example, in the cross-sectional view of the rail shown in FIG. 2 (b), when the adapter 4 is attached to a portion where the obliquely flat portion 11 and the rail side portion 13 of the rail bottom portion 10 cross each other, You may form the part 8 which has it in the cross-sectional shape which has a corner | angular part along the shape of the intersection part of 11 and 13 (refer the shape of the corner | angular part shown on the left side of (c) of FIG. 4 mentioned later).

<Embodiment 2>
FIG. 3 is a view showing an example when the micro heater having the present invention is attached to the outside of the pipe. 3, (a) is a view when the microheater 14 and the pipe 15 are viewed from the side, (b) is an EE cross-sectional view of the microheater 14 and the pipe 15, and (c) is a sheath heater 16 and an adapter 17. It is the expansion perspective view which looked at the connection part with the adapter 17 from the lower side. As shown in FIG. 3C, the microheater 14 follows the outer shape of the pipe 15 as a portion 18 having a cross section different from the cross section of the adapter body (circular cross section) in a part of the adapter 17. A curved surface shape (concave portion) is provided.

  As shown in FIG. 3 (a), the micro heater 14 is attached to the outside of the pipe 15 outside, and the snow melting effect against snowfall, carry-in snow, snowfall, etc. is obtained by heating the pipe 15 using the electrothermal effect. Used to get. As other applications, a fluid such as water moving inside the pipe 15 can be warmed and used as a heat pipe. The electric heating operation of the micro heater 14 is performed while being controlled through the two lead wires 19. Although the present embodiment shows an example in which the microheater 14 is attached to one outside of the pipe 15, a plurality of the microheaters 14 may be attached in the outer circumferential direction of the pipe 15.

  In FIG. 3, the portion 18 having an irregular cross section has a concave cross section along the outside of the pipe 15, so that the adapter 17 is attached together with the terminal adapter 20 in a state where the adapter 17 is fixed so as not to move. It can be performed. Thereafter, the microheater 14 is fixed using the mounting bracket 21 for attachment. As a result, the adapter 17 can be prevented from rotating, so that the problem that only the root of the microheater 14 rotates and breaks can be prevented.

  In the present embodiment, as in the first embodiment, a micro heater in which a portion 18 having a different cross section is formed in a part of the adapter 14 is used. A portion having a cross section different from the cross section of the main body may be formed in 20.

  Embodiments 1 and 2 show examples in which flat portions, corner portions, and concave portions are formed as the portions 8 and 18 that are provided in a part of the adapters 4 and 17 and have cross sections different in shape from the adapter main body, respectively. However, the adapter of the present invention may have a cross-sectional shape other than those. In FIG. 4, the example of the cross-sectional shape of the adapter of this invention is shown with sectional drawing of the state which contacted the to-be-attached member. FIG. 4 also shows flat portions, corner portions, and concave portions described as different shapes in the first and second embodiments. In FIG. 4, in order to emphasize the irregularly shaped portion in each example of the cross-sectional structure, it is represented by a slightly thicker line than the other portions, but the thick line constitutes the same cross section as the other lines.

  As shown in FIG. 4, for example, (a) a flat portion, (b) a flat portion, (c) a corner portion, (d) a concave portion, and (e) are provided as a cross section provided in a part of the adapter 22 of the present invention. A convex part etc. can be formed. These irregularly shaped cross sections are formed in a shape along the shape of the attachment portion of the attached member 23 with which the adapter 22 contacts. If the contact portion with the mounted member 23 is flat, the adapter 22 having a cross-sectional shape in which (a) a flat portion or (b) a flat portion is formed is used. Among these, the flat part (b) has an advantage that it can be easily attached and fixed when the adapter 22 is attached and the adapter 22 is fixed with an attachment jig or the like because both sides are flat. .

  The corner portion (c) shown in FIG. 4 is used when an attachment portion for bringing the adapter 22 into contact with the attachment member 23 has an angle. Here, (c) the corner is not limited to a right angle, and may be either an acute angle or an obtuse angle, and is formed by freely changing the angle so as to follow the cross-sectional shape of the portion in contact with the attached member 23. be able to.

  4 (d) and (e) show that all or a part of the cross section of the adapter 22 in contact with the mounted member 23 has a curved shape, and a part of the cross section of the adapter 22 depends on the cross sectional shape. (D) A concave portion or (e) a convex portion is formed. Note that the cross-sectional shape shown on the rightmost side of FIG. 4E has a larger curvature than the cross-section of the adapter 22 in the deformed portion 24, and is classified as a convex portion for convenience in the present invention.

<Embodiment 3>
An adapter mounting structure for mounting the microheater of the present invention to a mounted member will be described in the present embodiment. FIG. 5 is a diagram showing an example of an adapter mounting structure according to the present invention. 5A is a view of the attachment portion of the sheath heater 26 and the adapter 27 when the microheater 25 is attached as viewed from the side, and FIG. 5B is a view of the attachment portion of both from the lower side of the adapter 27. FIG.

  As shown in FIG. 5A, when the microheater 25 is attached to the attached member 28, the microheater 25 may float from the attached member 28 depending on the shape of the adapter 27. In particular, the floating is remarkable at the boundary between the sheath heater 26 and the adapter 27. In that case, since heat-insulating air exists between the microheater 25 and the mounted member 28 that have been lifted, when the microheater 25 is heated, the floating portion contacts the sheath heater 26 and the mounted member 28. Heat transferability is inferior to that of the part, and an abnormal increase in temperature may be observed locally. Due to this abnormal rise in temperature, it becomes impossible to perform appropriate temperature adjustment of the micro heater 25. Furthermore, a significant decrease in the life of the microheater 25 is unavoidable, and in the worst case, the microheater 25 may be disconnected.

  As shown in FIG. 5B, the micro heater mounting structure according to the present embodiment has a cross section having a different shape from the main body cross section of the adapter 27 when the micro heater 25 is mounted to the mounted member 28. When the contact surface between the sheath heater 26 containing the portion 29 and the heating wire 30 and the attached member 28 is represented by a line L simulating the major axis direction of the microheater 25, the irregularly shaped cross section of the adapter 27 on the L line. The distance (D) between the points 29 and the sheath heater 26 that are separated from the contact surface with the attached member 28 is set within 5 times the outer diameter or thickness (T) of the sheath heater 26. . Here, T means the outer diameter when the cross section of the sheath heater 26 is circular, and the thickness when the cross section is flat.

  In the mounting structure shown in FIG. 5, the present inventors actually mounted the microheater 25 while changing the ratio of D and T, and measured the temperature rise of the microheater in the floating portion. As a result, the temperature difference between the floating portion and the portion of the sheathed heater 26 that is in contact with the attached member 28 could be suppressed small by setting the D on the L line to be within 5 times the T. . This is because the floating of the micro heater 25 from the attached member 28 can be suppressed.

  On the other hand, in the microheater in which the D is slightly larger than 5 times the T, the floating of the microheater 25 is increased, so that the temperature difference between the raised portion and the portion of the sheathed heater 26 that is in contact with the attached member 28. May increase to several tens of degrees Celsius in some cases. As the ratio of D to T was further increased, the temperature rise of the microheater in the floating portion was further increased. This makes it difficult to adjust the temperature of the micro heater 25. In addition, since the life of the microheater 25 is reduced, it is necessary to replace the microheater 25 during use. In the worst case, disconnection of the microheater 25 is caused during use, and heating of the attached member 28 cannot be performed effectively and efficiently.

  In addition, as disclosed in Patent Documents 1 to 3, when a microheater having a conventional structure in which the entire adapter has a circular cross-sectional shape is used, the floating of the microheater becomes larger. This behavior is due to the restriction of the adapter shape that the outer circumference of the circular cross-section of the adapter having a larger diameter than the sheath heater contacts the attached member at the boundary with the sheath heater. Therefore, in the conventional microheater, not only the damage of the microheater due to rotation or twist, but also the problem of abnormal temperature rise due to the large floating of the microheater cannot be avoided.

  As described above, in the microheater mounting structure, when the D is within 5 times the T on the line L, the floating of the sheathed heater 26 of the microheater 25 from the mounted member 28 can be suppressed, and the floating It is possible to prevent the microheater temperature of the portion from rising abnormally.

<Embodiment 4>
FIG. 6 is a view showing a modification of the two-core microheater provided with the adapter of the present invention. The two-core microheater shown in FIG. 6 differs from that shown in FIG. 1 in that all or part of the sheath heater has a flat cross section.

  FIG. 6A is a plan view of the two-core microheater 31 having a flat cross section of the entire sheath heater, and the F, G, and H sections of the two-core microheater 31 are enlarged at the bottom of the plan view. Each figure is shown. As shown in FIG. 6 (a), the sheath heater 33 (see the FF cross-sectional view), the adapter 34, and the terminal adapter 35, which includes two heating wires 32 inside and has a flat cross section, is included. It has an adapter portion and a lead wire 36. Two of the lead wires 36 are connected to two of the heating wires 32 led out from the end of the sheath heater inside the adapter 34 and the terminal adapter 35, respectively. The end portion on the sheath heater 33 side and the connecting portion of the lead wire 36 connected to the heating wire led out from the end portion are housed inside the adapter portion.

  FIG. 6B shows a two-core microheater 41 in which the sheath heater portion close to the connection portion with the adapter has a flat cross section and the other portions have a circular cross section. The two-core microheater 41 is shown with a plan view and an enlarged view of the cross section of each position of I, J, K, and L of the two-core microheater 41 at the bottom of the plan view. In the two-core micro heater 41 shown in FIG. 6B, the cross-sectional shape of the sheath heater portion 43b near the connection portion with the adapter 44 is flat (see the JJ cross-sectional view), and the cross-sectional shape of the other portion 43a is the same. Except for the circular shape (see the II cross-sectional view), the other configuration is basically the same as that shown in FIG.

  As shown in FIG. 6 (a) or (b), the adapter 34 or 44 is provided in a part of the portion located in the direction from the boundary portion 37 or 47 of the sheath heater 33 or 43 to the lead wire 36 or 46. A portion 38 or 48 having a cross section different from the cross section of the main body of the adapter 34 or 44 is provided. That is, the portion 38 or 48 having an irregular cross section is different from the circular shape of the cross section of the main body of the adapter 34 or 44 (see the HH cross section or the LL cross section), and a part of the circle is flat. It has a cut shape (see GG cross section or KK cross section).

  In the present embodiment, an example of a microheater in which all (sheath heater 33) or a part (sheath heater portion 43b) of the sheath heater has a flat cross section is shown. However, the flat shape is as shown in FIG. It is not limited, A square shape of a square or a rectangle may be sufficient. For example, a micro heater including a planar sheath heater having a rectangular cross section can be used.

  In the micro heaters 31 and 41 shown in FIG. 6, the adapters 34 and 44 are provided with portions 38 and 48 having a cross section different from the shape of the adapter body, and at least a portion of the sheath heaters 33 and 43 near the adapters 34 and 44 is flat. Since it has a cross section in shape, it can be easily fixed to a mounted member having a flat surface or a curved surface, and is excellent in attachment. Furthermore, the sheath heater having a flat cross section has a higher thermal efficiency because the heating wire and the attached member are closer to each other than those having a circular cross section, and a sufficient thermal effect can be obtained with relatively low energy. Use as a micro heater can be promoted.

<Embodiment 5>
The adapter of the present invention can be provided not only in the two-core microheater shown in FIG. 1, but also in a one-core microheater that includes one heating wire in the sheath heater portion. FIG. 7 shows an example of a single-core microheater equipped with the adapter of the present invention. FIG. 7 shows a plan view of the single-core microheater 51 and an enlarged view of each cross section of M, N, and O of the single-core microheater 51 at the bottom of the plan view.

  As shown in FIG. 7, the single-core microheater 51 is formed by cutting a sheath heater 53 having one heating wire 52 inside to a desired length, and an adapter portion and leads composed of an adapter 54 and a terminal adapter 55 at both ends. Each line 56 is provided. The lead wire 56 is connected to one of the heating wires 52 led out from the end of the sheath heater 53. The end portion on the sheath heater 53 side and the connecting portion of the lead wire 56 connected to the heating wire led out from the end portion are housed inside the adapter portion.

  The two adapters 54 include a portion 58 having a cross-section different from the cross-section of the main body of the adapter 54 at a portion located in a direction from the boundary portion 57 to the sheath heater 53 to the lead wire 56. Unlike the circular shape of the cross section of the main body 54 (see the OO cross section), each of the circles is provided with a shape that is cut into a flat shape (see the NN cross section). In the present embodiment, the irregularly shaped portion formed in the portion 58 having the irregularly shaped cross section is not limited to a flat portion. Depending on the shape of the mounted member that contacts when the mounting is performed on the mounted member, any one of the irregularly shaped portions shown in FIG. 4 may be used.

  The adapter portion shown in FIG. 7 is composed of two parts, that is, an adapter 54 and a terminal adapter 55. In the present embodiment, the adapter 54 and the terminal adapter 55 are similar to those in the first embodiment. A single adapter structure having the same cross-sectional diameter may be used, or an adapter structure including three or more parts may be used.

  When the one-core microheater 51 according to the present embodiment is compared with the two-core microheater 1 shown in FIG. 1, the latter two-core microheater 1 is composed of a single sheath heater and an adapter portion, so that it is lightweight and compact. Since it has a simple shape, it is excellent in handleability and attachment to a member to be attached. Therefore, when the installation place is narrow and it is desired to improve the mounting work efficiency of the microheater, it is preferable to use the two-core microheater 1.

  As described above, the adapter of the present invention is easy to fix when mounting the microheater to a mounted member having a flat surface or curved surface, such as a rail or a pipe, and has excellent mounting properties, and can be rotated and twisted during and after mounting. Can be used to prevent damage to the microheater. In addition, since the microheater equipped with the adapter of the present invention can efficiently and appropriately perform the heating performed after mounting the mounted member, it is easy to use and greatly improves durability by preventing abnormal heating. Can be achieved. Since the adapter of the present invention and the microheater including the adapter can be applied to various members having various forms and shapes as a member to be attached, its utility is extremely high.

1, 14, 25, 31, 41 ... 2-core micro heater 2, 30, 32, 42, 52 ... heating wire 3, 16, 26, 33, 43, 53 ... sheath heater 4, 17, 22 27, 34, 44, 54 ... adapters 5, 20, 35, 45, 55 ... terminal adapters 6, 19, 36, 46, 56 ... lead wires 7, 37, 47, 57 ... Boundary portions 8, 18, 29, 38, 48, 58... Portions having irregular cross sections 9... Rail 10... Rail bottom portion 11. Support bracket 13 ... rail side 15 ... piping 23, 28 ... attached member,
24 ... irregularly shaped part 51 ... single core micro heater

Claims (6)

Provided in a microheater having a sheath heater housing a heating wire in a sheath and a lead wire connected to the heating wire led out from the end of the sheath heater, and the heating wire led out from the end of the sheath heater and the end An adapter for storing the connecting portion of the lead wire connected to
An adapter, wherein a portion having a cross section different in shape from a cross section of the main body of the adapter is provided in a part of a portion located in a direction from the boundary portion with the sheath heater to the lead wire.   In accordance with the contact surface shape of the attached member when attaching the microheater to the attached member, a flat portion in a cross section of a portion located in a direction from the boundary portion with the sheath heater to the lead wire, The adapter according to claim 1, wherein at least one irregular shape selected from a flat portion, a corner portion, a concave portion, and a convex portion is formed.   A microheater comprising: a sheath heater in which a heating wire is housed in a sheath; a lead wire connected to the heating wire led out from an end portion of the sheath heater; and the adapter according to claim 1.   The microheater according to claim 3, wherein the sheath heater has a flat cross section.   The microheater according to claim 3 or 4, wherein the sheath heater is one in which two heating wires are housed in a sheath.   The attachment of the microheater according to any one of claims 3 to 5, wherein the sheath heater suppresses lifting from a member to be attached, so that the adapter has a portion having a cross section different from the cross section of the main body and the sheath heater and the sheath. When the contact surface with the mounting member is represented by a line L simulating the long axis direction of the microheater, each of the sheath heater and the portion of the adapter having a cross section different from the main body cross section on the L line. A microheater mounting structure, wherein a distance between points separated from a contact surface with the mounted portion is set to be within 5 times the outer diameter or thickness of the sheath heater.

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