JP5772624B2 - Temperature measuring device - Google Patents

Description

  The present invention relates to a temperature measuring device in which the insertion length of a thermometer with a protective tube to a temperature measuring object is variable, and in particular, an incinerator, a hot air furnace, an FCC (fluid catalytic cracking device), and a tail gas in for sulfur recovery device. The present invention relates to a temperature measuring device suitable for measuring fluid temperature in a sineator or the like.

  Conventionally, in order to obtain an optimum temperature profile with a temperature measurement device in a process in which this type of operation efficiency and temperature are closely related, the relationship between the temperature and the insertion length of the thermometer protection tube is investigated or measured. It is required to reduce the wear of the thermometer protective tube (erosion due to catalyst and dust) due to the temperature target. Generally, in order to obtain an appropriate temperature profile, it is necessary to lengthen the insertion length of the thermometer protection tube. On the other hand, in order to reduce the influence of the thermometer on the process as much as possible and to reduce the wear of the thermometer protection tube, it is necessary to shorten the insertion length of the thermometer protection tube. Thus, in order to find the minimum insertion length that can withstand the temperature measurement accuracy in an environment that does not like to disturb the process flow due to the presence of the thermometer, a temperature measuring device with a variable insertion length of the thermometer protection tube has been conventionally used. It has been proposed (see, for example, Patent Document 1).

  Patent Document 1 relates to a temperature measuring device having a seal union that is attached to a pipe or the like in a state where a thermometer protection pipe is sealed. A thermometer protection tube with an elastic sealing material inserted is attached, and after inserting it to a predetermined depth, the union nut portion is turned to seal by sealing the spherical elastic sealing material. When changing the insertion length of the thermometer protection tube, the union nut portion is loosened, the insertion depth is changed, and then the union nut portion is tightened again.

  However, according to the temperature measuring apparatus of Patent Document 1 described above, when the temperature measurement target is a high pressure, it is feared that the thermometer will fall off, and the tightening force is more than necessary to maintain the original sealing property (airtightness). The excessive tightening force tends to be applied, and the sealing material is pinched with an excessive force, and the elasticity is impaired, which causes a rapid degeneration. In addition, when changing the insertion length of the thermometer protective tube, it is necessary to loosen the sealing material and position the thermometer again, and then tighten it again. If the insertion length is changed, the thermometer may fall off at the moment when the union nut portion is loosened, and since the safety is low, it is difficult to adjust the insertion length during operation.

Japanese Utility Model No.5-1733

  Therefore, in view of the above-described situation, the present invention intends to solve the problem by reliably preventing the thermometer protection tube from coming off while sealing with the tightening force necessary to maintain the original sealing performance (airtightness). The object is to provide an inexpensive temperature measuring device that can adjust and set the insertion length of the thermometer protection tube suitable for the conditions even during the pressurization operation with good workability and safety.

  In order to solve the above-mentioned problems, the present invention provides a temperature measuring device having a thermometer with a protective tube, wherein the protective tube is provided so that the protective tube is movably inserted in the axial direction. A single or a plurality of annular seal members are mounted in the gap with the protective tube, a pressure member is provided for pressing and holding the annular seal member in the axial direction to seal the gap, and an outer peripheral portion and a proximal end side of the attachment member A connecting means for connecting the outer peripheral portion of the protective tube extending to each other so that the relative position along the axial direction can be changed, and by changing the relative position by the connecting means, A temperature measuring device characterized in that the projecting length of the protective tube projecting toward the distal end side of the mounting member is adjustable.

  Here, the connecting means extends from the flange on the outer peripheral portion of the mounting member to the base end side, and is inserted into a through hole formed in the flange on the outer peripheral portion of the protective tube, and the screw It is preferable to use a nut that is mounted on a shaft and that includes a nut that sandwiches the flange of the protective tube and fixes the flange to the screw shaft.

  In addition, it is preferable that the annular seal member is inserted into the gap between the attachment member and the protective tube from the base end side, and the pressing member is inserted into the gap from the base end side.

  In particular, a fastening means is provided between the outer peripheral flange extending from the gap of the pressing member to the base end side and the outer peripheral flange of the mounting member, and the pressing member is tightened by the fastening means. What moves to an attachment member side along an axial direction, and press-holds the said annular seal member is preferable.

  Further, the connecting means extends from the flange on the outer peripheral portion of the mounting member to the base end side, and is formed on the through hole formed in the flange of the pressing member and the flange on the outer peripheral portion of the protective tube. A screw shaft inserted into both of the through holes and a nut attached to the screw shaft and sandwiching the flange of the protective tube to fix the flange to the screw shaft are preferable.

  Moreover, while extending the elongate member which has a long hole along an axial direction toward the base end side from the outer peripheral part of the said attachment member, the said protection tube of extending to the base end side of the said attachment member A guided portion is provided on the outer peripheral portion having an engaging portion that is slidably guided along the elongated hole when the relative position with the mounting member is changed by engaging with the elongated hole of the elongated member. And it is preferable to provide a display portion for displaying an index indicating the protruding length of the protective tube from the position of the engaging portion of the guided portion at a position along the elongated hole of the elongated member.

  Furthermore, it is preferable to apply a heat-resistant lubricant to the contact surface of the annular seal member with the protective tube.

  In particular, a grease-up ring for supplying grease as the heat-resistant lubricant is interposed between the plurality of annular seal members, and at a position corresponding to the grease-up ring on the outer peripheral wall of the mounting member. It is preferable to provide a grease supply nozzle that passes through the outer peripheral wall and supplies grease to the grease-up ring.

  Further, a fluid supply for supplying a purge fluid to the outer peripheral wall of the attachment member, which is in communication with a clearance between the protective tube and a tip side of the mounting position of the annular seal member. What provided the nozzle is preferable.

  According to the present invention as described above, it is only necessary to seal the annular seal member by applying the minimum necessary pressure to the annular seal member, and the protective tube can be detached by connecting the outer peripheral portion of the attachment member and the outer peripheral portion of the protective tube. The relative position along the axial direction of each other can be separately prevented by a connecting means that can be changed, and only by changing the relative position by operating this connecting means, it is optimal without loosening the pressure applied to the seal member. The protective tube can be moved in the axial direction while maintaining the sealed state, and the protruding length of the thermometer protective tube (insertion length to the temperature measurement object) suitable for the conditions during pressurization operation is easy and safe. Can be adjusted and set.

  A screw shaft extending from a flange on an outer peripheral portion of the attachment member to a proximal end side and inserted into a through hole formed in the flange on the outer peripheral portion of the protective tube; and the screw shaft And a nut that clamps the flange of the protective tube and fixes the flange to the screw shaft, so that the insertion length of the thermometer protective tube can be adjusted in detail, and since it is an inexpensive structure, the pressure operation In particular, it is possible to provide a temperature measuring device that can adjust the insertion length safely and with good workability at a low cost.

  Further, since the annular seal member is inserted into the gap from the protective tube from the base end side of the mounting member, and the pressing member is also inserted into the gap from the base end side, the sealing performance is high. Can provide structure.

  Further, a fastening means is provided between the outer peripheral flange extending from the gap of the pressing member to the proximal end side and the outer peripheral flange of the mounting member, and the pressing member is tightened by the fastening means. Since the annular seal member is moved in the axial direction to the attachment member side and pressed and held, the structure with high sealing performance can be provided at low cost, and the assembly work of the annular seal member is also easy.

  Further, the connecting means extends from the outer peripheral flange of the mounting member to the proximal end side, and the through hole formed in the flange of the pressing member and the through hole formed in the outer peripheral flange of the protective tube A screw shaft that is inserted into both of the holes, and a nut that is attached to the screw shaft and sandwiches the flange of the protective tube and fixes the flange to the screw shaft. Since the screw shaft is passed through the through hole and assembled to the flange of the pressing member, the apparatus can be made compact.

  Moreover, while extending the elongate member which has a long hole along an axial direction toward the base end side from the outer peripheral part of the said attachment member, the said protection tube of extending to the base end side of the said attachment member A guided portion is provided on the outer peripheral portion having an engaging portion that is slidably guided along the elongated hole when the relative position with the mounting member is changed by engaging with the elongated hole of the elongated member. In addition, since the display unit is provided at the position along the elongated hole of the elongated member, the display unit displays an index indicating the protruding length of the protective tube from the position of the engaging portion of the guided portion. It is possible to adjust accurately while reading the indicators and grasping the protruding length of the protective tube.

  In addition, since the heat-resistant lubricant is applied to the contact surface of the annular seal member with the protective tube, the protective tube can be smoothly moved in the axial direction while maintaining the sealing performance by the applied pressure. However, it is possible to prevent an unforeseen situation in which the wire is fixed to the outer peripheral surface of the protective tube and twisted or torn during movement.

  In addition, a grease-up ring for supplying grease as the heat-resistant lubricant is interposed between the plurality of annular seal members, and at a position corresponding to the grease-up ring on the outer peripheral wall of the mounting member. Since the grease supply nozzle for supplying the grease to the grease-up ring through the outer peripheral wall is provided, the grease is supplied from the grease supply nozzle to continuously improve the sealing performance of the annular seal member. It is possible to prevent leakage of the internal fluid that is the target of temperature measurement more reliably, and the lubricity of the annular seal member is continuously maintained, so that the protective tube can be moved smoothly in the axial direction at any time by the connecting means. Therefore, twisting and tearing of the annular seal member can be reliably prevented, and the annular seal member can be reliably protected. Further, since the grease-up ring is interposed between the annular seal members, the grease can be reliably supplied to each annular seal member.

  Further, a fluid supply for supplying a purge fluid to the outer peripheral wall of the attachment member, which is in communication with a clearance between the protective tube and a tip side of the mounting position of the annular seal member. Since the nozzle is provided, a purge fluid such as an inert gas or steam is supplied from the fluid supply nozzle, and the annular seal member can be protected by preventing corrosion or the like of the annular seal member due to the internal fluid to be measured. In addition, accumulation of scale (coke or the like) in the gap can be prevented, and the scale can be prevented from obstructing the adjustment of the protruding length of the protective tube by the connecting means or adversely affecting the temperature measurement accuracy. Further, in the event of an emergency, a caulking material or the like can be injected into the gap from the fluid supply nozzle to prevent leakage of the internal fluid that is a temperature measurement target.

BRIEF DESCRIPTION OF THE DRAWINGS The simplified longitudinal cross-sectional view which shows the temperature measuring apparatus which concerns on 1st Embodiment of this invention. The AA cross-sectional view of FIG. 1 which similarly shows a temperature measuring device. Explanatory drawing which shows the modification of a connection means. The simplified longitudinal section showing the temperature measuring device concerning a 2nd embodiment of the present invention. The enlarged simplified longitudinal cross-sectional view which shows the principal part of a temperature measuring device similarly.

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

  First, a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the temperature measuring device 1 according to the present embodiment has a thermometer 2 with a protective tube (well) and a protective tube (well) 21 of the thermometer 2 movably inserted in the axial direction. The attachment member 3, the annular seal member 4 mounted in the gap S1 between the attachment member 3 and the protective tube 21, the pressing member 5 for pressing and holding the annular seal member 4 in the axial direction and sealing the gap S1, The outer peripheral part 3a of the attachment member 3 and the outer peripheral part 21a of the protective tube 21 extending to the base end side are configured by a connecting means 6 that connects the relative positions along the axial direction so that the relative positions can be changed. . As the thermometer 2, conventionally known thermometers can be widely applied. In this example, the thermometer 2 is a thermometer in which a sheath thermocouple 20 is inserted inside the protective tube 21. A resistor or other thermometer can also be used.

  The attachment member 3 includes a cylindrical main body 30 that is externally mounted on the protective tube 21, a distal end side flange 31, and a proximal end side flange 32, and is formed on a furnace wall or the like in which a fluid to be temperature-measured is present. In a state where the thermometer 2 is inserted into the attachment hole, the front end side flange 31 is fixed around the attachment hole by welding or the like. In this example, an annular convex portion 33 is further provided on the inner peripheral surface of the cylindrical main body 30, and the base end side of the inner peripheral surface of the cylindrical main body 30 and the outer peripheral surface of the protective tube 21. A gap S1 for mounting the annular seal member 4 is formed between the two.

  The annular convex portion 33 is formed by fitting an annular member having an inner peripheral surface with almost no gap between the outer peripheral surface of the protective tube 21 and welding it to the inner peripheral surface of the cylindrical main body 30, but without welding. It may be configured such that it is locked to the step portion on the inner peripheral surface of the cylindrical main body 30 and inserted so as to be immovable toward the tip side. Conversely, it may be formed integrally with the cylindrical body 30. The annular seal member 4 is inserted into the gap S1 from the base end side of the mounting member 3, and the pressing member 5 is also inserted into the gap S1 from the base end side of the inserted annular seal member 4. . A plurality of annular seal members 4 are provided in this example, but the number is not limited. In addition, as for the type of the annular seal member 4, a known heat-resistant / pressure-resistant packing or the like can be appropriately used depending on the application.

  The pressing member 5 is inserted into the gap S1 and has a cylindrical main body 50 that presses the annular seal member 4 at its distal end, and a flange 51 provided on the outer peripheral portion on the base end side that extends from the gap S1. The fastening member 7 is provided between the outer peripheral portion 3a of the attachment member 3 and the proximal end side flange 32. By the fastening of the fastening member 7, the pressing member 5 is moved along the axial direction. As a result, the distal end portion of the cylindrical main body 50 presses the annular seal member 4, and the annular seal member 4 is pressurized and compressed and deformed between the annular convex portion 33, so that the cylinder of the attachment member 3 The space between the inner peripheral surface of the main body 30 and the outer peripheral surface of the protective tube 21 of the thermometer 2 is sealed.

  The fastening means 7 includes a plurality of through holes 51a formed at a plurality of positions in the circumferential direction at equal intervals in the annular flange 51, in this example, four places, and each of the through holes of the flange 51 of the annular base end side flange 32. Between the through hole 32b formed at a position corresponding to 51a, a screw shaft 70 (stud bolt) is inserted, and nuts 71 and 71 are screwed on the outer side opposite to the side where each flange faces, It is tightened with a uniform force without bias in the circumferential direction. As shown in the cross-sectional view of FIG. 2, the fastening means 7 are provided at four locations at equal intervals in the circumferential direction. 1 is a cross-sectional view taken along line BB in FIG. In this example, each of the flanges 51 and 32 is formed in an annular shape having substantially the same outer diameter, but it is of course possible to have different outer diameter dimensions, or one or both may be formed in a shape other than the annular shape. For example, a preferable example is a structure in which the flange 51 has a small diameter or a shape other than an annular shape, and a screw shaft 60 of the connecting means 6 to be described later is allowed to escape so that a through hole 51b for inserting the screw shaft 60 is omitted. It is.

  Further, the fastening means 7 is not limited to the above structure, and other known fastening means may of course be employed. For example, instead of the combination of the screw shaft 70 and the nut 71, a hexagon bolt with a head, a combination of a hexagon socket head bolt and a nut, or a bolt that has a through hole 32b as a female screw groove and penetrates the through hole 51a. Can be used, or a clamp mechanism for tightening both flanges can be used instead of using bolts or the like.

  As described above, in the conventional temperature measuring device, the axial position of the protective tube is also maintained by the pressure applied by the seal member, so that the force beyond the pressure for the original seal is applied to prevent the protective tube from coming off. However, in the present invention, it is only necessary to apply the minimum necessary pressure optimum for sealing to the annular seal member 4 by the tightening means 7, and the protective tube 21 can be securely removed by the connecting means 6 described later. In addition, the projection length (that is, the insertion length into the temperature measuring object) can be adjusted by moving the protective tube 21 in the axial direction by adjusting the connecting means 6.

  That is, once the annular seal member 4 is pressurized and sealed by the tightening means 7, the adjustment of the protruding length of the protective tube 21 is maintained without maintaining the optimum sealing state without loosening the tightening means 7. In this state, the protective tube 21 can be moved in the axial direction simply by operating the connecting means 6, improving the safety and adjusting the protruding length during operation, thereby significantly improving workability. . In this example, the protective tube 21 of the annular seal member 4 is smoothly moved in the axial direction with the pressure applied and the twisted or torn of the annular seal member is prevented in advance. A heat-resistant lubricant is applied to the contact surface.

  The connecting means 6 extends from the base end side flange 32 of the attachment member 3 to the base end side, and is inserted into a through hole 22b formed in the flange 22 of the outer peripheral portion 21a of the protective tube 21 (bolt shaft 60). ), And nuts 61 and 61 that are attached to the screw shaft 60 and sandwich the flange 22 of the protective tube 21 to fix the flange 22 to the screw shaft 60. In this example, the connecting means 6 including the screw shaft 60 and the nuts 61 and 61 are arranged at a plurality of positions at equal intervals in the circumferential direction of the proximal end flange 32. In this example, as shown in FIG. However, it extends in two symmetrical places, and the movement of the protective tube 21 in the axial direction is performed in a balanced manner with a uniform force that is not biased in the circumferential direction.

  The screw shaft 60 passes through a through hole 51 b formed in the flange 51 of the pressing member 5 and is inserted into the through hole 22 b of the flange 22. Then, the protruding length of the protective tube 21 is adjusted by rotating the nuts 61 and 61 and changing the fixing position of the flange 22 with respect to the screw shaft 60. Each screw shaft 60 has a distal end portion fixed to the proximal end side flange 32 of the attachment member 3 by welding, but may be fixed by other means. The screw shaft 60 only needs to have a male screw portion formed in an adjustment range where at least the nuts 61 and 61 can move. The flange 22 is formed by fixing an annular member to the outer peripheral surface of the protective tube 21 by welding. However, the flange 22 does not necessarily have to be an annular member, and is configured integrally with the protective tube 21. If it exists, it may be fixed by means other than welding, or may be formed integrally with the protective tube 21.

  Further, the connecting means 6 has a screw shaft 60 and nuts 61, 61 provided between the proximal flange 32 and the flange 22, for example, as shown in FIG. Provided with a frame member 61A having a substantially I-shaped outer shape that can be rotated and locked relative to the axial direction, and the flange 22 can be moved in the axial direction by the rotation of the piece member 61A. Is bolted to the proximal flange 32 so that the bolt 22 is also rotatable with respect to the flange 22 and is not relatively movable in the axial direction, and the flange 22 together with the bolt is rotated with respect to the proximal flange 32 by the rotation of the bolt. The relative position of the outer peripheral part of the attachment member 3 and the outer peripheral part of the protective tube 21 may be connected so as to be changeable by other known connecting structures such as a structure configured to be movable in the axial direction.

  Further, in this example, the elongated member 8 having the long hole 80 along the axial direction is extended from the outer peripheral portion 3 a of the attachment member 3 toward the proximal end side, and the outer peripheral portion 21 a of the protective tube 21 is provided on the outer peripheral portion 21 a. The guided portion 9 has an engaging portion 91 that is slidably guided along the elongated hole 80 when the relative position with the mounting member 3 is changed by engaging with the elongated hole 80 of the elongated member 8. Is protruding. At a position along the long hole 80 of the elongated member 8, there is an indicator 81 indicating the projection length of the protective tube 21 from the position of the engaging portion 91 of the guided portion 9, in this example, a display portion 81 on which a scale is displayed. It is provided so that the protruding length of the protective tube 21 can be grasped only by reading the scale of the engaging portion 91.

  More specifically, a support plate 82 extending outward is fixed to the outer peripheral end portion of the distal end side flange 31 of the attachment member 3 by welding, and the long member 8 is supported by the support plate 82 in one end. It extends to the base end side. The guided portion 9 having the engaging portion 91 at the tip is fixed by welding at the same circumferential position as the support plate 82 at the outer peripheral end of the flange 22 of the protective tube 21, and protrudes in parallel with the support plate 82. It is installed.

  Next, based on FIG.4 and FIG.5, 2nd Embodiment of this invention is described.

  In this embodiment, a grease-up ring 41 for supplying grease as a heat-resistant lubricant is interposed between the plurality of annular seal members 4 and 4. In this example, two annular seal members 4 are interposed so as to be located in the middle of the total four annular seal members 4, that is, on the distal end side and the proximal end side of the grease-up ring 41. In addition to the configuration in which the grease-up ring 41 is interposed between the annular seal members 4 and 4 as described above, between the annular seal member 4 and the annular convex portion 33, or between the annular seal member 4 and the cylindrical main body 50. It is also possible to interpose a grease-up ring 41 between the tip portion. However, it is preferable to interpose between the annular seal members in order to reliably supply the grease to each annular seal member 4.

  The grease-up ring 41 is pressed between the distal end portion of the cylindrical main body 50 and the annular convex portion 33 together with the annular seal member 4 by the fastening of the fastening means 7. Since the grease-up ring 41 is movable in the axial direction similarly to the annular seal member 4, even if the grease-up ring 41 is present, all of the four annular seal members 4 are uniformly pressurized, and the cylindrical main body 30. The space between the inner peripheral surface and the outer peripheral surface of the protective tube 21 is well sealed.

  At the position of the outer peripheral wall of the cylindrical main body 30 corresponding to the position of the grease-up ring 41 in this sealed state, a grease supply nozzle 40 is provided for supplying the grease to the grease-up ring 41 through the outer peripheral wall. It has been. By supplying grease from the grease supply nozzle 40 by a supply means (not shown), the sealing performance of the annular seal member 4 can be continuously improved, and leakage of the internal fluid that is a temperature measurement target can be prevented more reliably. Since the lubricity of the annular seal member 4 is continuously maintained, the connecting tube 6 can smoothly move the protective tube 21 in the axial direction at any time, and the twist and tear of the annular seal member can be reliably prevented. The annular seal member 4 can be reliably protected.

  Further, in the present embodiment, the portion of the mounting member 3 on the outer peripheral wall of the cylindrical main body 30 that is closer to the tip than the mounting position of the annular seal member 4 communicates with the clearance S2 between the inner peripheral protection tube 21 and the clearance S2. A fluid supply nozzle 34 for supplying a purge fluid is provided. By supplying a purge fluid such as an inert gas or steam from the fluid supply nozzle 34 by means of a supply means (not shown), the annular seal member 4 can be protected by preventing corrosion or the like of the annular seal member 4 due to internal fluid, Scale (coke etc.) can be prevented from accumulating on the inner peripheral surface of the cylindrical main body 30, the outer peripheral surface of the protective tube 21, the annular convex portion 33, etc. in the gap S 2, and the scale can move in the axial direction of the protective tube 21. It is possible to prevent obstructing or adversely affecting the temperature measurement accuracy. Further, in the event of an emergency, a caulking material or the like can be injected into the gap S2 from the fluid supply nozzle 34 to prevent leakage of the internal fluid that is the object of temperature measurement.

  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 Temperature measuring device 2 Thermometer 3 Mounting member 3a Outer peripheral part 4 Annular seal member 5 Pressing member 6 Connecting means 7 Tightening means 8 Long member 9 Guided part 20 Sheath thermocouple 21 Protective tube 21a Outer part 22 Flange 22b Through-hole 30 Cylindrical body 31 Front side flange 32 Base end side flange 32b Through hole 33 Annular projection 34 Fluid supply nozzle 40 Grease supply nozzle 41 Grease-up ring 50 Cylindrical body 51 Flange 51a Through hole 51b Through hole 60 Screw shaft 61 Nut 61A Top member 70 Screw shaft 71 Nut 80 Elongated hole 81 Display part 82 Support plate 91 Engagement part S1 gap S2 gap

Claims (5)

In the temperature measuring device having a protective tube with a thermometer,
While providing an attachment member to which the protective tube is movably inserted in the axial direction,
A single or a plurality of annular seal members are mounted in the gap between the mounting member and the protective tube,
A pressing member for pressing and holding the annular seal member in the axial direction to seal the gap is provided;
A connecting means for connecting the outer peripheral portion of the attachment member and the outer peripheral portion of the protective tube extending to the proximal end side so as to be able to change the relative position along the axial direction of each other;
By changing the relative positions by the connecting means, and an adjustable and the temperature measuring device the projection length of the protective tube protruding tip side of the mounting member,
The annular seal member is inserted into the gap with the protective tube from the base end side of the mounting member, and the pressing member is also inserted into the gap from the base end side,
A fastening means is provided between the outer peripheral flange extending from the gap of the pressing member to the proximal end side and the outer peripheral flange of the mounting member, and the pressing member is attached to the mounting member by tightening the fastening means. It moves along the axial direction to the side and presses and holds the annular seal member,
The connecting means includes a through hole formed on the flange of the pressing member and a through hole formed on the flange of the outer periphery of the protective member. A temperature measuring device comprising: a screw shaft that is inserted through both sides; and a nut that is attached to the screw shaft and sandwiches the flange of the protective tube and fixes the flange to the screw shaft. In the temperature measuring device having a protective tube with a thermometer,
While providing an attachment member to which the protective tube is movably inserted in the axial direction,
A single or a plurality of annular seal members are mounted in the gap between the mounting member and the protective tube,
A pressing member for pressing and holding the annular seal member in the axial direction to seal the gap is provided;
A connecting means for connecting the outer peripheral portion of the attachment member and the outer peripheral portion of the protective tube extending to the proximal end side so as to be able to change the relative position along the axial direction of each other;
By changing the relative positions by the connecting means, and an adjustable and the temperature measuring device the projection length of the protective tube protruding tip side of the mounting member,
An elongate member having an elongated hole along the axial direction extends from the outer peripheral portion of the mounting member toward the base end side, and the outer peripheral portion of the protective tube extends to the base end side of the mounting member A guided portion having an engaging portion that is slidably guided along the elongated hole when the relative position with the mounting member is changed by engaging with the elongated hole of the elongated member; A display unit for displaying an index indicating the protruding length of the protective tube from the position of the engaging portion of the guided portion is provided at a position along the elongated hole of the elongated member. Temperature measuring device. In the temperature measuring device having a protective tube with a thermometer,
While providing an attachment member to which the protective tube is movably inserted in the axial direction,
A single or a plurality of annular seal members are mounted in the gap between the mounting member and the protective tube,
A pressing member for pressing and holding the annular seal member in the axial direction to seal the gap is provided;
A connecting means for connecting the outer peripheral portion of the attachment member and the outer peripheral portion of the protective tube extending to the proximal end side so as to be able to change the relative position along the axial direction of each other;
By changing the relative positions by the connecting means, and an adjustable and the temperature measuring device the projection length of the protective tube protruding tip side of the mounting member,
A temperature measuring device comprising a heat-resistant lubricant applied to a contact surface of the annular seal member with a protective tube. A grease-up ring for supplying grease as the heat-resistant lubricant is interposed between the plurality of annular seal members, and at a position corresponding to the grease-up ring on the outer peripheral wall of the mounting member, The temperature measuring device according to claim 3, further comprising a grease supply nozzle for supplying grease to the ring for grease up through an outer peripheral wall. A fluid supply nozzle that communicates with the outer peripheral wall of the attachment member, which is a gap between the protective tube and a tip side of the annular seal member, and supplies a purge fluid to the gap. The temperature measuring device according to any one of claims 1 to 4 , wherein the temperature measuring device is provided.

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