JP2018141709A - Mounting structure for sheathed thermocouple, pad to be used for the same mounting structure, and mounting method for sheathed thermocouple - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mounting structure of a sheathed thermocouple capable of reducing the number of components, obtaining sufficient strength, stably holding a sheathed thermocouple without letting it come off from a pad even at the time of occurrence of bending or twisting and tension, and improving workability of attachment/detachment of the sheathed thermocouple to/from the pad.SOLUTION: A pad 1 is formed with an insertion groove part 2 and a locking groove part 3, and a sheathed thermocouple 9 is formed with a recessed groove 91 extending in a circumferential direction, and the locking grove part 3 is constituted of an inwardly expanding groove 12 formed with a relatively wide groove part 31 externally opened in a radial direction and a relatively narrow groove part 32, and a coming-off prevention member 5 mounted via an externally opened site of the locking groove part 3 on the internal sheathed thermocouple 9 is abutted to an inner wall surface 12a such that the sheathed thermocouple 9 is prevented from moving to an axial direction base side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an attachment structure for attaching a sheath thermocouple to a surface to be measured via a pad, a pad used therefor, and a method for attaching the sheath thermocouple.

  As a mounting structure of this type, a thermocouple with a pad is prepared by fitting a tip thermosensitive part of a sheathed thermocouple into a metal plate (pad) with a thickness of about 3 to 5 mm and fixing it. A structure is adopted in which the probe is pulled to the temperature measurement target surface and attached by welding the pad at the tip to the temperature measurement target surface (see, for example, FIG. 5 of Patent Document 1).

  In addition, as a structure in which a sheath thermocouple is detachably attached to a pad that has been fixed to the surface to be measured in advance by welding or the like, an insertion groove for receiving the temperature sensing portion of the sheath thermocouple is provided in the pad. In addition, a grip portion for detachably holding the sheath thermocouple is provided outside the mouth portion for receiving the sheath thermocouple of the insertion groove, and the sheath thermocouple is fixed to the temperature measurement target surface. A mounting structure for a sheathed thermocouple is also proposed, in which a temperature-sensing part is inserted into the insertion groove, and the part that is exposed to the outside of the mouth is gripped by the gripping part. Patent Document 2).

  According to the mounting structure of Patent Document 2, there is no need to weld and fix the sheath thermocouple to the pad, and it is possible to prevent the puncture of the sheath tube and the resulting moisture absorption, measurement error, and decrease in responsiveness. There is no need for post-processing on the lower surface side, which is a contact surface with the temperature target surface, leading to a reduction in manufacturing cost, responsiveness is maintained, and quality is stabilized. In addition, since only the pad is fixed to the surface to be measured first by welding or the like, the sheath thermocouple does not get in the way during the work, and the workability is also good when attaching to the complicated boiler tube. Remarkably improved. Since there is no thermocouple during the welding operation, thermal damage can be avoided. Furthermore, when exchanging the thermocouple, only the sheath thermocouple that can be attached to and detached from the pad can be exchanged, and there is an advantage that the exchange cost can be significantly reduced.

  However, the attachment structure of Patent Document 2 is a structure in which a cylindrical member as a separate member is fixed to the mouth of the pad main body as a gripping portion, and a substantially U-shaped gripping member is mounted across the cylindrical body. For this reason, the number of parts is large, the cost is increased, and there is a possibility that the fixed portion is damaged when an unexpectedly large force from the sheath thermocouple acts on the cylindrical body. Similarly, when the sheath thermocouple is bent, twisted, pulled, etc., the sheath thermocouple moves inside the tubular body, but the gripping member attached to the sheath thermocouple is a through-groove of the tubular body. Since the sheath thermocouple moves, the gripping member is pushed by the wall of the tubular body and opens, and the sheath thermocouple is detached from the sheath thermocouple. May come off the pad.

  Furthermore, as described above, the gripping member mounted across the cylindrical body is set to have a certain length of both gripping pieces in order to prevent the gripping member from being removed. Since the tip contacts the surface to be temperature-measured, it cannot be mounted on the cylindrical body in the vertical direction of the pad main body, and is mounted in a direction parallel to the vertical surface. Such mounting is poor on-site workability and causes efficiency reduction and mounting failure.

Japanese Patent Laid-Open No. 1-145537 Japanese Patent Laid-Open No. 2006-156788

  Therefore, in view of the above-described situation, the present invention intends to solve the problem in a mounting structure in which a sheath thermocouple is detachably attached to a pad that has been fixed to a surface to be measured in advance by welding or the like. The cost can be reduced by suppressing the number of points, and the pad is not damaged even if an unexpectedly large force is applied from the sheath thermocouple, and the sheath thermocouple is bent, twisted, and pulled. Even if it occurs, it can be stably held without coming out of the pad, and the attachment structure of the sheath thermocouple that improves the attachment / detachment workability of the sheath thermocouple, the pad used for this, and the sheath thermocouple The point is to provide a mounting method.

The present invention includes the following inventions.
(1) An attachment structure in which a sheath thermocouple is attached to a temperature measurement surface through a pad, and the sheath thermocouple is attached to the pad fixed in a state where the contact surface is in contact with the temperature measurement surface. An insertion groove portion in which the warm portion is inserted along the axial direction and a region closer to the base end side than the region inserted in the insertion groove portion of the sheath thermocouple are received, and the sheath thermocouple can be attached and detached in the axial direction. A circumferential groove in which a substantially C-shaped retaining member is detachably mounted from a radial direction at a predetermined location in a region received by the locking groove of the sheath thermocouple. The locking groove portion has a relatively wide groove portion that is open to the outside in the radial direction and that receives the retaining member on the inner side near the insertion groove portion, and is compared. A narrow groove is formed on the outer side. The retaining member attached to the sheath thermocouple inside the locking groove portion through the externally opened portion of the locking groove portion is formed on the inner wall surface of the locking groove portion. A sheathed thermocouple mounting structure, wherein the sheathed thermocouple is mounted in a state in which the sheathed thermocouple cannot be moved to the axial base end side by stopping.

  (2) The sheath according to (1), wherein the relatively wide groove portion of the locking groove portion is open to the outside on the surface opposite to the contact surface, and the retaining member is attached through the open portion. Thermocouple mounting structure.

  (3) An inwardly extending groove constituting the locking groove is formed continuously with the relatively wide first groove for receiving the retaining member and the first groove, and the inner wall surface is a sheath thermoelectric A relatively narrow second groove portion extending in a predetermined length in the axial direction along the pair of sheath outer peripheral surfaces, and the retaining member is the first groove portion of the inner wall surface of the inwardly extending groove. The sheath thermocouple mounting structure according to (1) or (2), which stops against a step portion formed at a boundary between the first groove portion and the second groove portion.

  (4) The pad is made of a plate material having a substantially parallel upper and lower surface whose lower surface serves as the contact surface, and a groove extending in parallel with the contact surface is formed in the center of the pad as the insertion groove portion. The locking groove portion is a groove opened to the edge portion that reaches the pad edge portion continuously to the insertion groove portion, and the relatively wide groove portion is open to the outside on the pad upper surface (1) The attachment structure of the sheath thermocouple in any one of-(3).

  (5) The attachment structure of the sheath thermocouple according to any one of (1) to (4), wherein the relatively wide groove is an upper and lower communication groove opened on the upper and lower surfaces of the pad.

  (6) The sheath thermocouple mounting structure according to any one of (1) to (5), wherein the entire inwardly extending groove constituting the locking groove is an upper and lower communication groove opened on the upper and lower surfaces of the pad.

  (7) A pad used for the sheath thermocouple mounting structure according to any one of (1) to (6), wherein a temperature sensing portion of the sheath thermocouple is inserted along the axial direction; A locking groove for receiving a region proximal to the region inserted into the insertion groove of the sheath thermocouple and detachably locking the sheath thermocouple in the axial direction is provided; The groove portion has a relatively wide groove portion that is open to the outside in the radial direction and receives the retaining member on the inner side near the insertion groove portion, and a relatively narrow groove portion is formed on the outer side. The sheath thermocouple is configured such that the temperature sensing portion is inserted into the insertion groove, and the sheath thermocouple is attached to the concave groove through the externally opened portion of the locking groove portion. The stop member abuts against the inner wall surface of the groove extending inwardly of the locking groove portion. Pad attached to the condition to be immovable in the axial direction base end side by.

  (8) An attachment method for attaching a sheath thermocouple to a temperature measurement target surface via a pad, wherein the sheath thermocouple is attached to the pad fixed in a state where the contact surface is in contact with the temperature measurement target surface. An insertion groove portion in which the warm portion is inserted along the axial direction and a region closer to the base end side than the region inserted in the insertion groove portion of the sheath thermocouple are received, and the sheath thermocouple can be attached and detached in the axial direction. A circumferential groove in which a substantially C-shaped retaining member is detachably mounted from a radial direction at a predetermined location in a region received by the locking groove of the sheath thermocouple. The locking groove portion has a relatively wide groove portion that is open to the outside in the radial direction and that receives the retaining member on the inner side near the insertion groove portion, and is compared. Narrow groove is formed on the outer side A step of fixing the pad in a state in which the contact surface is in contact with the surface to be measured, and a feeling of the sheath thermocouple in the insertion groove portion of the fixed pad. Inserting the warm portion along the axial direction, inserting a region closer to the proximal end than the region inserted into the insertion groove portion of the sheath thermocouple into the engagement groove portion; and A substantially C-shaped retaining member is inserted toward the inner sheath thermocouple through an externally opened portion of the relatively wide groove, and is detachably attached to the concave groove of the sheath thermocouple from the radial direction. And the retaining member attached to the sheath thermocouple abuts against the inner wall surface of the inwardly extending groove of the locking groove, so that the sheath thermocouple moves toward the proximal end in the axial direction. A sheath characterized by being attached in an impossible state How to install a thermocouple.

  (9) The sheath thermocouple is configured to be bent at a position proximal to a region attached to the pad, and after the sheath thermocouple is attached to the pad, the sheath thermocouple is inserted into the insertion groove. Rotating the entire sheath thermocouple around the axis of the region to be touched, bringing the region on the proximal end side from the bent portion of the sheath thermocouple into contact with the temperature measurement object, and the step of the sheath thermocouple (8) The method for attaching a sheath thermocouple according to (8), further comprising a step of fixing the proximal end region in contact with the temperature measurement object to the temperature measurement object.

  (10) The step of fixing the pad in a state in which the contact surface is in contact with the surface to be measured is a plate-like mounting jig, and is folded in a shape bent in the plate thickness direction at one end in the longitudinal direction. The mounting jig is attached to the pad by inserting the folded part of the mounting jig having a part into the relatively wide groove part of the locking groove part of the pad through the open part and crimping to the inner wall of the groove part. Holding the other end of the mounting jig, positioning the pad in a state where the contact surface is in contact with the surface to be measured, and fixing the positioned pad to the surface to be measured The method for attaching a sheath thermocouple according to (9), comprising the step of:

  (11) The step of fixing the positioned pad to the temperature measurement target surface includes temporarily fixing the pad to the temperature measurement target surface by spot welding while holding the other end of the mounting jig; (10) The method for attaching a sheath thermocouple according to (10), comprising the step of fixing the pad that has been made to the surface to be measured by welding all around.

  According to the present invention as described above, since the insertion groove and the sheath thermocouple are detachably locked to the pad in the axial direction, the pad is provided separately from the conventional pad body. In this structure, the number of parts can be reduced and the cost can be reduced. Compared with the conventional cylindrical body fixed to the pad body, the locking groove formed in a part of the pad has sufficient strength, and an unexpectedly large force from the sheath thermocouple acts. The sheath thermocouple is stably held without being damaged.

  The locking groove portion has a relatively wide groove portion that opens to the outside in the radial direction and receives a retaining member on the inner side near the insertion groove portion, and a relatively narrow groove portion on the outer side. The retaining member that is formed by the formed inwardly extending groove and is attached to the inner sheath thermocouple through the part that is open to the outside of the locking groove portion contacts the inner wall surface of the inwardly extending groove of the locking groove portion. Thus, since the sheath thermocouple is attached in a state in which the sheath thermocouple cannot move to the proximal side in the axial direction, the retaining member is integrally and firmly engaged with the sheath thermocouple inside the locking groove, Even when the sheath thermocouple is bent, twisted, or pulled, it does not open like a conventional gripping member and does not come out of the sheath thermocouple, and a firm engagement state with the sheath thermocouple is maintained. Therefore, the sheath thermocouple can be stably held with respect to the pad.

  Further, since the retaining member does not open due to the force received from the cylindrical body unlike the conventional gripping member, there is no need to provide a long gripping piece, and therefore the mounting direction is also orthogonal to the contact surface of the pad. It can be mounted along the direction (in the embodiment, the vertical direction from the upper surface to the lower surface (contact surface)), and the workability on site can be improved. Specifically, a relatively wide groove portion of the locking groove portion is open to the outside on the surface opposite to the contact surface (the upper surface in the embodiment), and the retaining member is attached through the open portion. In this case, the workability of attaching / detaching the sheathed thermocouple in the field is remarkably improved.

  In addition, an inwardly extending groove constituting the locking groove is formed continuously with the first groove having a relatively wide width for receiving the retaining member and the first groove, and the inner wall surface is a sheathed thermocouple. And a relatively narrow second groove portion extending a predetermined length in the axial direction along the outer peripheral surface of the sheath, and the retaining member includes the first groove portion of the inner wall surface of the inwardly extending groove. If it is configured to stop against the step formed at the boundary of the second groove, the sheath thermocouple can be held together with the retaining member with a simple structure.

  Further, the pad is made of a plate material having a substantially parallel upper and lower surface whose lower surface serves as the contact surface, and a groove extending in parallel to the contact surface is formed in the pad central portion as the insertion groove portion, If the locking groove is a groove opened to the edge that reaches the pad edge continuously to the insertion groove, and the relatively wide groove is open to the top surface of the pad. Thus, a sheath thermocouple mounting structure can be realized at a lower cost with a simpler structure.

  Further, when the relatively wide groove is an upper and lower communication groove opened on the upper and lower surfaces of the pad, the manufacturing cost can be further reduced.

  Further, the manufacturing cost can be further reduced when the entire inwardly extending groove constituting the locking groove portion is the upper and lower communication groove opened to the upper and lower surfaces of the pad.

  In addition, as a method of attaching the sheath thermocouple, in particular, the sheath thermocouple is configured to be bent at a position proximal to the region attached to the pad, and after the sheath thermocouple is attached to the pad , Rotating the entire sheath thermocouple around the axis of the region to be inserted into the insertion groove, and bringing the proximal end region from the bent portion of the sheath thermocouple into contact with the temperature measurement object And fixing the base end side region of the sheath thermocouple in contact with the temperature measuring object to the temperature measuring object, the base end side of the bent sheath thermocouple is the temperature measuring object. Since it can be easily held by hand away from the object, the workability is remarkably improved, and after attaching the sheath thermocouple to the pad, the sheath thermocouple is brought into contact with the temperature measurement object to be stable. Can be retained. Since the sheath thermocouple is bent as described above, the mounting operation can be facilitated by rotating the sheath thermocouple with respect to the pad after mounting and allowing the sheath thermocouple to follow the surface to be measured. Because.

  In the conventional structure, it is impossible to rotate the sheath thermocouple with respect to the pad in this way because the gripping member falls off and the sheath thermocouple comes out. This is possible only with the mounting structure of the present invention. Since the sheath thermocouple is bent, the workability is improved as described above, and the bent portion absorbs the force such as the tensile force of the sheath thermocouple even after mounting, and the stable holding state with the pad is maintained. .

  Further, as a step of fixing the pad in a state in which the contact surface is in contact with the surface to be measured, the plate-shaped mounting jig, which is a folded portion having a shape bent in the thickness direction at one end in the longitudinal direction. The folding part of the mounting jig having the insertion part is inserted into the relatively wide groove part of the locking groove part of the pad through the open part, and is crimped to the inner wall of the groove part to attach the mounting jig to the pad. A step of gripping the other end side of the mounting jig, positioning the pad in a state where the contact surface is in contact with the surface to be measured, and fixing the positioned pad to the surface to be measured With the process, even if the temperature measurement target surface is a narrow place where it is difficult to work, the mounting jig is gripped and the pad is stably positioned on the temperature measurement target surface and securely and easily fixed by welding or the like. Can work, work efficiency and fixed state It is possible to increase the quality. In addition, after fixing the pad to the surface to be measured, until the sheath thermocouple is attached to the pad, the attachment jig is kept inserted in the engagement groove portion, so that the engagement groove portion or In particular, it is possible to prevent dust and coating material from entering the insertion groove portion, and it is possible to maintain good heat transfer with the sheath thermocouple.

  Specifically, as a step of fixing the positioned pad to the temperature measurement target surface, temporarily fixing the pad to the temperature measurement target surface by spot welding while gripping the other end side of the mounting jig; The pad can be efficiently welded and fixed to the surface to be measured by including the step of fixing the temporarily fixed pad to the surface to be measured by circumferential welding.

The perspective view which shows the attachment structure of the sheath thermocouple which concerns on typical embodiment of this invention. Similarly, the front view of the mounting structure as seen from the top side of the pad Similarly sectional drawing. The exploded perspective view of an attachment structure similarly. (A) is a front view of the pad used in the mounting structure as seen from the upper surface side, (b) is a bottom view of the pad as seen from the lower surface (contact surface) side, and (c) is the same as seen from the locking groove side. Side view. (A) is the perspective view which similarly shows a pad, (b) is the perspective view which looked at the pad main body from the contact surface side. Explanatory drawing which shows the attachment procedure of a sheath thermocouple. The front view which shows the modification of a pad. (A), (b) is explanatory drawing which shows a mode that a mounting jig is mounted | worn to a pad. (A), (b) is explanatory drawing which shows a mode that a pad is fixed to a temperature measurement object surface using an attachment jig. Sectional drawing which shows the state which fixed the pad to the temperature measurement object surface using the attachment jig.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  The sheath thermocouple attachment structure S according to the present invention relates to a structure for attaching the sheath thermocouple 9 to the temperature measuring surface 80 via the pad 1 as shown in FIGS. The pad 1 is fixed with the contact surface 10 in contact with the temperature measurement target surface 80. As shown in FIGS. 5 and 6, the pad 1 is made of a plate material having a substantially parallel upper and lower surface whose lower surface serves as the contact surface 10. A curved surface parallel to the temperature measurement target surface 80 is formed so as to be in close contact. The contact surface 10 is appropriately set according to the shape of the temperature measurement target surface. The upper and lower surfaces may not be parallel.

  The pad 1 can be formed by bending a flat plate material, but is not limited thereto. Further, the lower surface side of the flat plate material may be cut into a concave curved surface, and the upper surface may be left flat. The material of the pad 1 is preferably the same material as that of the temperature measurement object 8, in this example, the boiler tube, in order to avoid disturbance of the temperature distribution due to the difference in thermal conductivity, but other materials can also be adopted. In this example, for example, a stainless steel material is used, but various metal materials can be used according to the place of use and purpose, and the thickness thereof can be appropriately adjusted.

  In this embodiment, the temperature measurement target surface 80 is an example of a boiler tube outer wall surface, and the contact surface 10 of the pad 1 is configured as a parallel concave curved surface that is in close contact with the outer wall surface. The pad 1 is fixed to the temperature measurement target surface 80 by welding three sides of the pad 1 to the temperature measurement target surface 80 excluding the base end side that is the locking groove portion 3 side. However, the pad 1 can also be fixed to the temperature measurement target surface 80 by other attachment means other than welding.

  As the sheathed thermocouple 9, conventionally known thermocouples in which a thermocouple element made of a different metal is housed together with an electric insulating material in a metal sheath sealed at the tip can be widely used. For example, the metal sheath can be austenitic stainless steel (SUS304, SUS316, etc.), nickel chrome heat resistant alloy (Inconel), or the like. As the thermocouple element to be installed, for example, a nickel-chromium alloy can be used for the plus side element, and a nickel alloy can be used for the minus side element. For example, MgO or Al2O3 can be used as the electrical insulating material filled in the sheath.

  The temperature sensing part 90 at the tip has a thermocouple wire warm contact inside the sheath. This warm contact is non-contact with the metal sheath, welded to the metal sheath, Various types such as those integrated with the sheath tip during sealing can be used. The shape of the metal sheath may be a hook shape, an ellipse shape, or the like other than a circular shape.

  As shown in FIGS. 2 and 4, the sheath thermocouple 9 is provided with a recessed groove 91 extending in the circumferential direction at a predetermined position in the region R <b> 2 received in the locking groove portion 3 of the pad 1. The substantially C-shaped retaining member 5 is detachably mounted from the radial direction.

  The pad 1 has an insertion groove portion 2 into which the temperature sensing portion 90 of the sheath thermocouple 9 is inserted along the axial direction, and a proximal end than the region R1 inserted into the insertion groove portion 2 of the sheath thermocouple 9. A locking groove portion 3 is provided for receiving the side region R2 and for locking the sheath thermocouple 9 so as to be detachable in the axial direction.

  The insertion groove portion 2 is a groove extending in parallel with the contact surface 10 of the pad 1 so as to make the area as large as possible contact the outer surface of the sheath of the temperature sensing portion 90 of the inserted sheath thermocouple 9, that is, its axis. Is a groove parallel to the contact surface 10. In this example, as shown in FIG. 5 and FIG. 6, the groove is formed in the center of the pad and extends in parallel with the contact surface 10.

  The inner wall surface of the insertion groove portion 2 has a size that contacts the outer peripheral surface of the sheath of the temperature sensing portion 90 of the sheath thermocouple 9 in order to transmit the heat transmitted from the temperature measurement target surface 80 to the pad 1 to the temperature sensing portion 90 without delay. Is set. Further, the insertion groove 2 is a groove that opens to the contact surface 10. Thereby, the outer peripheral surface of the sheath of the temperature sensing unit 90 can be directly brought into contact with the temperature measurement target surface 80 through the opening, and the pad can be made thin.

  The insertion groove part 2 can also be comprised by the hole opened not only on the contact surface 10 side (lower surface side) of the pad 1 but also on the upper surface. As a result, the pad 1 can be made thinner. Moreover, it can also be set as the groove | channel inclined so that it might approach the temperature measurement object surface 80, so that the sheath thermocouple front end side.

  As shown in FIGS. 5 and 6, the locking groove portion 3 is a groove opened to the edge portion that reaches the edge portion 13 on the pad base end side continuously to the insertion groove portion 2, and is formed in the insertion groove portion 2. Near the inner side, there is provided a relatively wide first groove 31 that receives the retaining member 5 that is open to the outside in the radial direction (pad upper surface 11 in this example). A second groove 32 having a relatively small width is formed on the outer side (from the base end). As described above, the locking groove portion 3 includes the inwardly extending groove 12 having the groove portions 31 and 32.

  The second groove portion 31 is a relatively narrow groove formed continuously from the first groove portion 31 and having an inner wall surface extending a predetermined length in the axial direction along the outer peripheral surface of the sheath of the sheath thermocouple.

  Then, with the temperature sensing part 90 of the sheath thermocouple 9 inserted into the insertion groove part 2, the outside of the relatively wide groove part 31 of the locking groove part 3 (inner spreading groove 12) is opened to the outside. By inserting the retaining member 5 from a site (opening 31a on the upper surface 11 side) in the radial direction (in this example, the direction toward the lower surface side) and mounting it in the concave groove 91 of the sheath thermocouple 9, FIG. As shown in FIG. 3, the retaining member 5 comes into contact with the inner wall surface 30 of the inwardly extending groove of the engaging groove portion 3 so that the sheath thermocouple 9 cannot move to the proximal end side in the axial direction with respect to the pad 1. It is attached.

  In this example, the groove portions 31 and 32 are both upper and lower communication grooves opened on the upper and lower surfaces of the pad, whereby the entire inwardly extending groove 12 constituting the locking groove portion 3 is opened on the upper and lower surfaces of the pad. The upper and lower communication grooves. The inwardly extending groove 12 can take various forms such as a rounded groove or a tapered groove as shown in FIG.

  As shown in the drawing, the metal retaining member 5 is preferably a known metal E-shaped retaining ring (E-ring). Other than that, for example, a known bow E-shaped retaining ring, crescent-shaped retaining ring, U-shaped retaining ring is used. Well-known radial direction type retaining rings such as a ring and a K-shaped retaining ring and other substantially C-shaped retaining rings can be suitably used. As shown in FIG. 2, the retaining member 5 abuts against a stepped portion 12 a formed at the boundary between the first groove portion 31 and the second groove portion 32 in the inner wall surface 30 of the inwardly extending groove 12.

  The thickness of the retaining member 5 is preferably set to be thinner than the axial width of the concave groove 91 of the sheathed thermocouple 9 attached as shown. As a result, when a force that causes a relative movement between the pad 1 and the sheath thermocouple 9 is generated due to heat, the sheath thermocouple 9 is released in the axial direction with respect to the pad 1, and distortion can be avoided. That is, especially in the case of boiler tubes, the outer wall of the tube, which is the surface to be measured, moves greatly in the axial direction due to thermal contraction, so that a force to move relatively is generated. However, when an external force acts on the thermocouple, Occurs, which also causes a measurement error. By allowing the relative movement as described above, it is possible to prevent an excessive stress on the temperature sensing part and a measurement error due to this.

  For the same purpose, the axial width of the first groove portion 31, that is, the distance between the end surface on the insertion groove portion 2 side and the stepped portion 21 a on the second groove portion 32 side is, as shown in FIG. In order to enable movement of the member 5 along the axial direction, it is preferable that the thickness is set larger than the thickness of the retaining member 5.

  Next, the attachment procedure until the sheath thermocouple 9 is attached to the temperature measurement target surface 80 via the pad 1 will be described for the attachment structure S of the present embodiment.

  First, the pad 1 is fixed to the temperature measurement target surface 80 by welding or the like in a state where the lower surface side contact surface 10 is in contact. The pad 1 is fixed by the following procedure. That is, first, in a state where the pad 1 is attached to the distal end portion 6a of the mounting jig 6 as shown in FIG. 9, the base end portion 6b of the mounting jig 6 is gripped to position the pad 1 on the surface to be measured. In this state, the pad 1 is fixed to the temperature measurement target surface.

  As shown in FIG. 10 (a), the fixing is performed by temporarily fixing the pad 1 to the temperature measurement target surface 80 by spot welding while holding the base end portion 6b of the mounting jig 6, and FIG. 10 (b). As shown in FIG. 5, the step of fixing the temporarily fixed pad 1 to the temperature measurement target surface 80 by welding all around. This eliminates the need to hold the mounting jig 6 when welding all around. Reference numeral 70 is a spot weld, and 71 is an all-around weld. During this all-around welding, the attachment jig 6 may be temporarily removed from the pad 1.

  As shown in FIG. 9, the mounting jig 6 has a folded portion 61 having a bent shape in the plate thickness direction on one end side (tip portion 6 a) in the longitudinal direction of the plate-like main body portion 60, and the other end side (base). The end 6b) becomes a gripping portion. In this example, it is composed of a metal spring plate, but it can also be composed of synthetic resin or other materials.

The folded portion 61 is bent and formed in a substantially V-shape or U-shape so as to be wider than the axial width of the relatively wide groove portion 31 of the locking groove portion 3 of the pad 1. Opening 3
By being inserted through 1a), it is detachably pressure-bonded to the inner wall of the groove 31 by the elastic restoring force of the folded portion 61.

  After the pad is fixed to the surface to be measured, until the sheath thermocouple is attached to the pad, the attachment jig 6 is not attached to the pad 1 but is still attached to the locking groove 3. Accordingly, even if the period is long before the sheath thermocouple is attached, or even when the surface to be measured and the pad are coated, dust or a coating material is applied to the locking groove 3 and particularly the insertion groove 2. Can be prevented from entering, and heat transferability with the sheath thermocouple can be maintained well.

  Next, the attachment jig 6 is removed from the pad 1 fixed to the temperature measurement target surface 80, and the temperature sensing part 90 of the sheath thermocouple 9 is inserted into the insertion groove part 2 of the pad 1 along the axial direction. Since the sheath thermocouple 9 is bent in a crank shape at a position closer to the base end side than the regions R1 and R2 attached to the pad 1, when inserted, from the bent portion 92 as shown in FIG. In addition, the region R1 and the region R2 on the distal end side from the bent portion 92 are easily attached to the pad 1 fixed to the temperature measurement target surface 80 while holding the region R3 on the proximal end side at a position away from the temperature measurement target surface 80 Can do.

  As the region R1 having the temperature sensing portion 90 of the sheath thermocouple 9 is inserted into the insertion groove portion 2, the region R2 on the proximal end side of the region R1 of the sheath thermocouple 9 is inserted into the locking groove portion 3 of the pad 1. Is done.

  In this state, next, a substantially C-shaped retaining member 5 is inserted toward the inner sheath thermocouple 9 through the part of the locking groove 3 that is open to the outside of the relatively wide groove 31. It is attached to the concave groove 91 of the sheath thermocouple 9 located in the groove portion 31. Thus, the retaining member 5 attached to the sheath thermocouple 9 abuts against the inner wall surface 30 of the groove 12 that extends inward in the locking groove portion 3, so that the sheath thermocouple 9 is pivoted against the pad 1. It becomes impossible to move to the direction base end side.

  Then, as shown in FIGS. 7A and 7B, the entire sheathed thermocouple 9 is rotated around the axis of the region R1 to be inserted into the insertion groove portion 2, and the sheath thermocouple 9 A region R3 on the base end side from the bent portion 92 is brought into contact with the temperature measurement object 8, and is fixed to the temperature measurement object 8 with a band or the like as appropriate.

  Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can of course be implemented in various forms without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Pad 2 Insertion groove part 3 Locking groove part 5 Retaining member 6 Mounting jig 6a Tip part 6b Base end part 8 Temperature measuring object 9 Sheath thermocouple 10 Contact surface 11 Upper surface 12 Groove 12a Step part 13 Edge part 30 Wall surface 31, 32 Groove part 31a Opening part 60 Main body part 61 Folding part 70 Spot welding part 71 Fully welded part 80 Temperature measuring surface 90 Temperature sensing part 91 Concave groove 92 Bending part R1, R2, R3 area S Mounting structure

Claims (11)

An attachment structure for attaching a sheath thermocouple to a surface to be measured via a pad,
An insertion groove portion into which the temperature sensing portion of the sheath thermocouple is inserted along the axial direction in the pad fixed in a state where the contact surface is in contact with the surface to be measured, and the insertion of the sheath thermocouple. A locking groove portion is provided for receiving a region closer to the base end side than the region inserted into the landing groove portion and for detachably locking the sheath thermocouple in the axial direction,
A concave groove extending in the circumferential direction in which a substantially C-shaped retaining member is detachably mounted from the radial direction is provided at a predetermined position in a region received by the locking groove portion of the sheath thermocouple,
The locking groove portion has a relatively wide groove portion that is open to the outside in the radial direction and that receives the retaining member on the inner side near the insertion groove portion, and the relatively narrow groove portion on the outer side. Composed of inwardly extending grooves formed in
When the retaining member attached to the sheath thermocouple inside through the part of the locking groove that is open to the outside contacts the inner wall surface of the inwardly extending groove of the locking groove, the sheath thermoelectric A sheath thermocouple mounting structure, wherein the pair is mounted in a state in which the pair cannot be moved to the proximal side in the axial direction.   The sheath thermocouple according to claim 1, wherein the relatively wide groove portion of the locking groove portion is opened to the outside on the surface opposite to the contact surface, and the retaining member is attached through the open portion. Mounting structure. An inwardly extending groove constituting the locking groove portion,
A relatively wide first groove for receiving the retaining member;
A second groove portion having a relatively narrow width, the inner wall surface being formed continuously with the first groove portion and extending a predetermined length in the axial direction along the sheath outer peripheral surface of the sheath thermocouple;
The sheath thermocouple according to claim 1 or 2, wherein the retaining member abuts against a step portion formed at a boundary between the first groove portion and the second groove portion in an inner wall surface of the inwardly extending groove. Construction. The pad is composed of a plate material having a substantially parallel upper and lower surface whose lower surface is the contact surface,
A groove extending parallel to the contact surface is formed in the pad center as the insertion groove,
The locking groove is a groove opened to the edge that reaches the pad edge continuously from the insertion groove,
The sheath thermocouple mounting structure according to any one of claims 1 to 3, wherein the relatively wide groove is open to the outside of the pad upper surface.   The sheath thermocouple mounting structure according to any one of claims 1 to 4, wherein the relatively wide groove portion is an upper and lower communication groove opened to an upper and lower surface of the pad.   The sheath thermocouple attachment structure according to any one of claims 1 to 5, wherein the entire inwardly extending groove constituting the locking groove portion is an upper and lower communication groove opened to a pad upper and lower surface. It is a pad used for the attachment structure of the sheath thermocouple of any one of Claims 1-6,
An insertion groove portion in which the temperature sensing portion of the sheath thermocouple is inserted along the axial direction and a region closer to the base end side than the region inserted in the insertion groove portion of the sheath thermocouple are received, and the sheath thermocouple is And a locking groove for detachably locking in the direction,
The locking groove portion has a relatively wide groove portion that is open to the outside in the radial direction and that receives the retaining member on the inner side near the insertion groove portion, and the relatively narrow groove portion on the outer side. Composed of inwardly extending grooves formed in
The sheath thermocouple has a temperature sensing portion inserted into the insertion groove, and the retaining member attached to the concave groove through the externally opened portion of the locking groove portion includes the locking groove portion. A pad that is attached in such a manner that it cannot move toward the proximal side in the axial direction by stopping against the inner wall surface of the inwardly extending groove. An attachment method for attaching a sheath thermocouple to a surface to be measured via a pad,
An insertion groove portion into which the temperature sensing portion of the sheath thermocouple is inserted along the axial direction in the pad fixed in a state where the contact surface is in contact with the surface to be measured, and the insertion of the sheath thermocouple. A locking groove portion is provided for receiving a region closer to the base end side than the region inserted into the landing groove portion and for detachably locking the sheath thermocouple in the axial direction,
A concave groove extending in the circumferential direction in which a substantially C-shaped retaining member is detachably mounted from the radial direction is provided at a predetermined position in a region received by the locking groove portion of the sheath thermocouple,
The locking groove portion has a relatively wide groove portion that is open to the outside in the radial direction and that receives the retaining member on the inner side near the insertion groove portion, and the relatively narrow groove portion on the outer side. Composed of inwardly extending grooves formed in
Fixing the pad in a state where the contact surface is in contact with the surface to be measured;
The temperature sensing portion of the sheath thermocouple is inserted in the insertion groove portion of the fixed pad along the axial direction, and the proximal end side of the region inserted in the insertion groove portion of the sheath thermocouple is inserted. Inserting the region into the locking groove,
A substantially C-shaped retaining member is inserted toward the inner sheath thermocouple through a portion of the locking groove that is open to the outside of the relatively wide groove, and the concave groove of the sheath thermocouple is inserted in the radial direction from the radial direction. And a process of detachably mounting,
When the retaining member attached to the sheath thermocouple comes into contact with the inner wall surface of the inwardly extending groove of the locking groove portion, the sheath thermocouple cannot move to the proximal side in the axial direction. A method for attaching a sheath thermocouple, wherein the sheath thermocouple is attached. The sheath thermocouple is configured in a bent shape at a position closer to the base end side than the region attached to the pad,
After attaching the sheath thermocouple to the pad, the entire sheath thermocouple is rotated around the axis of the region to be inserted into the insertion groove, and the region on the proximal end side from the bent portion of the sheath thermocouple A process of contacting along the temperature measurement object;
The method of attaching a sheath thermocouple according to claim 8, further comprising a step of fixing the proximal end region of the sheath thermocouple in contact with the temperature measurement object to the temperature measurement object. The step of fixing the pad in a state where the contact surface is in contact with the temperature measurement target surface,
A plate-shaped mounting jig, wherein the folded portion of the mounting jig having a folded portion bent in the thickness direction on one end side in the longitudinal direction is formed into a relatively wide groove portion of the locking groove portion of the pad. Inserting the mounting jig to the pad by inserting through the open part and pressing the inner wall of the groove,
Gripping the other end of the mounting jig and positioning the pad in a state where the contact surface is in contact with the surface to be measured;
Fixing the positioned pad to the surface to be measured;
The method for attaching a sheathed thermocouple according to claim 9. The step of fixing the positioned pad to the temperature measurement target surface,
Temporarily fixing the pad to the temperature measurement target surface by spot welding while holding the other end of the mounting jig;
Fixing the temporarily fixed pad to the temperature measurement target surface by welding all around,
The method for attaching a sheathed thermocouple according to claim 10.

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