JP6094707B1 - Temperature measuring device - Google Patents

Abstract

[PROBLEMS] To provide a high dimensional accuracy in consideration of a difference in thermal expansion between a sheath thermometer and a protective tube, to provide a low cost, good workability when the sheath thermometer is attached to the protective tube, and a backlash due to wear. There is provided a temperature measuring device that is high in durability, has little burden on the sheath thermometer, can suppress vibration of the sheath thermometer for a long period of time, and can prevent wear and breakage. A large-diameter coil portion 51 that contacts an inner peripheral surface 20 of a protective tube 2 at a predetermined axial position of a gap 4 between an inner peripheral surface 20 of a protective tube 2 and a sheath outer peripheral surface 31 of a sheath thermometer 3. And a coil spring 5 provided with at least a small-diameter coil portion 52 that abuts against the sheath outer peripheral surface 31 of the sheath thermometer 3. [Selection] Figure 1

Description

  The present invention relates to a temperature measuring device configured by inserting a sheath thermometer such as a sheathed resistance thermometer or a sheathed thermocouple into a protective tube, and in particular, an object such as a marine engine or a gas turbine having a large vibration. The present invention also relates to a temperature measuring device that can be suitably installed.

  This type of temperature measurement device has a problem that the sheath thermometer hits against the inner wall of the protective tube due to vibration and wears and breaks. Conventionally, for example, the steady state is prevented at a predetermined position in the gap between the sheath thermometer and the protective tube. Proposals have been proposed in which a ring is provided, a shape memory alloy support is also provided at a predetermined position in the gap, and the outer surface of the sheath thermometer is coated with chrome carbide (for example, Patent Documents 1 to 3). 3).

  The steady rest ring is designed so that a minute gap is maintained between the inner peripheral surface of the protective tube in consideration of workability at the time of attachment and thermal expansion difference between the sheath thermometer and the protective tube. If this minute gap is not maintained, the steady ring will be in close contact with the inner wall of the protective tube, and when a sheath thermometer provided with the steady ring is inserted into the protective tube and attached, workability will be significantly reduced, and the sheath There is a possibility that the steady-state ring fixing part is damaged, and a burden is caused at the same part due to the difference in thermal expansion during use. Conversely, if the minute gap is large, the backlash between the inner wall of the protective tube is large and vibration cannot be prevented. As described above, the steady rest ring has a simple structure, but high dimensional accuracy is required in relation to the gap. In addition, even if a fine gap with high accuracy is formed, there is a problem in durability that the steady rest ring gradually wears due to repeated vibrations as long as the minute gap is present, and the play is accelerated.

  Shape memory alloy supports and chrome carbide coatings have the problem of high manufacturing costs. In particular, the shape memory alloy support, like the steady ring, needs to be provided with a small gap between the inner peripheral surface of the protective tube in consideration of the thermal expansion difference. There is a risk that stress will concentrate on the sheath thermometer, causing a burden on the sheath thermometer and leading to breakage. Due to this minute gap, there is a durability problem similar to that of the steady rest ring in which the support is worn and the play is gradually increased.

Japanese Utility Model Publication No. 4-104539 JP 2008-241599 A JP 2006-78305 A

  Therefore, in view of the above-described situation, the present invention intends to solve the problem that the high dimensional accuracy considering the thermal expansion difference between the sheath thermometer and the protective tube is not required, and the protective tube of the sheath thermometer is low in cost. The temperature at which the work can be prevented from wearing and breaking due to good workability, no play due to wear, high durability, low burden on the sheath thermometer, and suppressing vibration of the sheath thermometer over a long period of time. The point is to provide a measuring device.

  In order to solve the above-mentioned problems, the present invention provides a temperature measuring device in which a sheath thermometer is mounted in a protective tube, and a gap is provided between the inner peripheral surface of the protective tube and the outer peripheral surface of the sheath thermometer. A coil spring including at least a large-diameter coil portion that contacts the inner peripheral surface of the protective tube and a small-diameter coil portion that contacts the outer peripheral surface of the sheath thermometer at a predetermined position in the axial direction of the gap. The temperature measuring device characterized by the above was constructed.

  Here, it is preferable that the coil spring is locked on the outer peripheral surface of the sheath so as not to move at least to the proximal end side, or the small-diameter coil portion is fixed on the outer peripheral surface of the sheath.

  In particular, the small-diameter coil portion fixed on the outer peripheral surface of the sheath exists on one side of both sides in the coil axial direction with respect to the large-diameter coil portion of the coil spring, and the coil portion extends further on the other side. Even if it is made, what is made into the state which is not fixed on the outer peripheral surface of a sheath is preferable.

  Further, a second small-diameter coil portion exists on the other side, and the second small-diameter coil portion is not fixed on the outer peripheral surface of the sheath and is relatively movable in the axial direction and the rotational direction in contact with each other. Are preferred.

  Further, it is preferable that an anti-rest ring fixed to the outer peripheral surface of the sheath is provided.

  The temperature measuring device according to the present invention having the above-described configuration is a large contact with the inner peripheral surface of the protective tube at a predetermined position in the axial direction of the gap between the inner peripheral surface of the protective tube and the sheath outer peripheral surface of the sheath thermometer. Since the coil spring provided with at least the small-diameter coil portion that contacts the outer diameter surface of the diameter coil portion and the sheath thermometer, the vibration of the sheath thermometer with respect to the protective tube can be absorbed efficiently, and the sheath thermometer is protected It is possible to prevent the tube from being worn or damaged by collision.

  In addition, since the thermal expansion difference between the sheath thermometer and the protective tube is efficiently absorbed by the elastic deformation of the spring, it is possible to avoid a burden (stress) on the sheath thermometer especially through the small-diameter coil, and the sheath can be used for a long time. The vibration of the thermometer can be suppressed and wear and damage can be prevented. In addition, since a small gap is not formed between the coil spring and the sheath thermometer or the protective tube and the coil spring is in contact via the small diameter coil portion and the large diameter coil portion, high dimensional accuracy is also required. Therefore, it can be manufactured at low cost, no wear or play occurs due to the presence of minute gaps, and the durability is remarkably higher than that of conventional steady rest rings.

  Furthermore, when attaching / removing the sheath thermometer, the coil thermospring is reduced in diameter by elastic deformation by rotating the sheath thermometer in the same direction as the winding direction of the coil spring with respect to the protective tube. The frictional resistance between the portion and the inner peripheral surface of the protective tube is reduced. Accordingly, by performing pushing / drawing while rotating in this way, the attaching / detaching operation can be easily performed without providing a minute gap like a steady ring.

  Further, the coil spring is locked on the outer peripheral surface of the sheath so as not to move at least to the proximal end side, or the small-diameter coil portion is fixed on the outer peripheral surface of the sheath. Can be positioned at a predetermined location on the outer peripheral surface of the sheath, whereby a desired vibration suppressing effect can be obtained. In particular, in the case where the coil spring is fixed on the outer peripheral surface of the sheath, the coil spring is held more stably, so that the coil spring moves in the axial direction due to vibration, and the outer peripheral surface of the sheath may be worn out. The desired vibration suppressing effect can be maintained over a long period of time.

  In addition, the small-diameter coil portion fixed on the outer peripheral surface of the sheath exists on one side of both sides in the coil axial direction of the coil spring with respect to the large-diameter coil portion, and the coil portion extends further on the other side. However, the elastic deformation of the coil spring is not restricted, the vibration can be absorbed sufficiently, and the sheath can be rotated when attaching / removing the sheath thermometer. When operated, the diameter of the coil spring is easily reduced, and the work can be easily performed with a small resistance.

  In addition, a second small-diameter coil portion exists on the other side, and the second small-diameter coil portion is not fixed on the outer peripheral surface of the sheath, and is relatively movable in the axial direction and the rotational direction in contact with each other. Therefore, the coil spring is stably held in a coaxial posture with the sheath thermometer, and vibration can be suppressed more stably, and the posture of the coil spring is stable when the sheath thermometer is attached and detached. Good workability.

  In addition, since a steady ring that is fixed to the outer peripheral surface of the sheath is provided, large vibrations can be efficiently reduced with the steady ring, and the remaining small vibrations can be reduced with coil springs. It can be reduced, and small vibrations can be efficiently suppressed by the coil spring, so that the steady ring can be worn out at an early stage and the backlash can be avoided as before, making it highly durable. be able to.

Explanatory drawing which shows the installation state of the temperature measuring device which concerns on 1st Embodiment of this invention. (A) is a perspective view which similarly shows the coil spring of a temperature measuring apparatus, (b) is a perspective view which shows the state which similarly fixed the coil spring to the sheath thermometer. Explanatory drawing which shows a mode that a sheath thermometer is similarly attached to a protective tube in a temperature measuring device. (A) is explanatory drawing which shows the principal part of the temperature measuring device which concerns on 2nd Embodiment of this invention, (b) is a perspective view which similarly shows the coil spring of a temperature measuring device, (c) is the coil temperature similarly in sheath temperature The perspective view which shows the state fixed to the meter. The principal part explanatory drawing which similarly shows the modification of the temperature measuring device. Similarly, the principal part explanatory drawing which shows the other modification of the temperature measuring device. (A) is principal part explanatory drawing which shows the other modification of a temperature measuring device similarly, (b) is a perspective view which similarly shows the coil spring of a modification, (c) is also fixing the coil spring to the sheath thermometer similarly The perspective view which shows a state. (A) is explanatory drawing which shows the principal part of the temperature measuring device which concerns on 3rd Embodiment of this invention, (b) is the perspective view which shows the state which fixed the coil spring and steadying ring of the temperature measuring device to the sheath thermometer similarly. Figure. (A) is principal part explanatory drawing which similarly shows the modification of a temperature measuring apparatus, (b) is a perspective view which shows the state which fixed the coil spring and steadying ring of the temperature measuring apparatus to the sheath thermometer. Similarly, the principal part explanatory drawing which shows the other modification of the temperature measuring device. The principal part explanatory drawing which shows the further another modification of a temperature measuring device similarly. (A) is explanatory drawing which shows the installation state of the temperature measuring apparatus which concerns on 4th Embodiment of this invention, (b) is explanatory drawing which shows the principal part of a temperature measuring apparatus similarly. Explanatory drawing which similarly shows the modification of a temperature measuring device.

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

  FIG. 1 is an explanatory view showing a temperature measuring apparatus 1 according to the present invention, in which FIGS. 1 to 3 are a first embodiment, FIGS. 4 to 7 are a second embodiment, and FIGS. 8 to 11 are a third embodiment. The form is shown. In the figure, reference numeral 1 denotes a temperature measuring device, 2 denotes a protective tube, 3 denotes a sheath thermometer, and 5 denotes a coil spring.

  As shown in FIG. 1, a temperature measuring device 1 according to the present invention is a device in which a sheath thermometer 3 is mounted in a protective tube 2, and an inner peripheral surface 20 of the protective tube 2 and a sheath outer peripheral surface of the sheath thermometer 3. A gap 4 is provided between the outer peripheral surface 31 and a large-diameter coil portion 51 that contacts the inner peripheral surface 20 of the protective tube 2 and a sheath outer peripheral surface 31 of the sheath thermometer 3 at a predetermined position in the axial direction of the gap 4. A coil spring 5 having at least a small-diameter coil portion 52 in contact therewith is provided.

  As the sheath thermometer 3, various sheath thermocouples and sheath resistance thermometers according to various conventionally known applications can be applied. As the protective tube 2, known ones conventionally used together with a sheath thermocouple, a sheath resistance thermometer, and the like can be applied.

  In this example, the protective tube 2 is fixed in a penetrating state to the piping wall 9 through which the fluid 90 flows, and the temperature of the fluid 90 is measured by the inner sheath thermometer 3. The protective tube 2 is welded and fixed to the outer surface of the pipe wall 9 via a fixing member 91. A female screw portion 21 is formed on the inner peripheral surface of the opening of the protective tube 2, and a male screw portion 32 formed at a corresponding proximal end side position of the sheath thermometer 3 is screwed and fixed. At the same time, the coil spring 5 is interposed between the protective tube 2 at an intermediate position in the axial direction to prevent vibration on the tip side. However, the present invention is not limited to such a form.

  As shown in FIG. 2, the coil spring 5 is provided with a small-diameter coil portion 52 that is in close contact with the sheath outer peripheral surface 31 at the distal end portion fixed to the sheath thermometer 3, and extends from the small-diameter coil portion 52 toward the proximal end side. The diameter gradually increases, and a large-diameter coil portion 51 that is in close contact with the inner peripheral surface 20 of the protective tube is provided at the base end portion. The material of the coil spring 5 is comprised from metal wires, such as stainless steel, and can be suitably selected according to the temperature range of temperature measurement object. A metal material having excellent heat conduction is preferable in that heat can be efficiently transferred from the protective tube 2 to the sheath thermometer 3 via the coil spring 5.

  Both the large-diameter coil portion 51 and the small-diameter coil portion 52 are preferable in that the number of turns of one or more turns can be stably maintained with respect to the protective tube 2 and the sheath thermometer 3, and two or more turns are more preferable. The type and diameter of the metal wire can be appropriately set according to the generated vibration. In this example, the small-diameter coil portion 52 is on the distal end side, and the large-diameter coil portion 51 is on the proximal end side. However, in consideration of the mounting operation of the sheath thermometer 3, it is preferable to direct the small-diameter coil portion 52 toward the distal end as in this example.

  The coil spring 5 has a small-diameter coil portion 52 fixed to the sheath outer peripheral surface 31 by welding or the like so as not to move at least to the proximal end side when the sheath thermometer 3 is attached. The sheath thermometer 3 is attached by being inserted into the protective tube 2 with the coil spring 5 attached. FIG. 3 is an explanatory view showing the mounting operation. As shown in FIG. 3, when the sheath thermometer 3 is inserted into the protective tube 2 while rotating the coil spring 5 in the winding direction, that is, clockwise, the coil spring 5 is elastically deformed so that its diameter is reduced, and is easily inserted. be able to. When the coil spring 5 is inserted to a predetermined position and stopped and released (freed), the coil spring 5 expands in diameter and is firmly attached to the inner peripheral surface 20 of the protective tube.

  The number of the large diameter coil part 51 and the small diameter coil part 52 with which the coil spring 5 is provided is not particularly limited, and can be provided at a plurality of positions in the axial direction. Moreover, although this embodiment demonstrated the example which provided only one coil spring 5 on the outer peripheral surface 31 of the sheath thermometer 3, according to the length of the sheath thermometer 3 and the protective tube 2, an application, and a kind, It is also a preferable example to provide a plurality of coil springs in the longitudinal direction.

  Next, a second embodiment of the present invention will be described based on FIGS.

  As shown in FIG. 4, the coil spring 5 of the present embodiment is provided with a second small-diameter coil portion 52 </ b> A on the opposite side to the small-diameter coil portion 52 that is fixed to the sheath outer peripheral surface 31 with respect to the large-diameter coil portion 51. It is a thing. Thereby, the attitude | position of the coil spring 51 is stabilized, vibration control property improves, and the operativity at the time of attachment of the sheath thermometer 3 also improves. That is, the coil spring 5 is stably held coaxially with the sheath thermometer 3 by both of the small-diameter coil portions 52 and 52A, and the effect of suppressing vibration is enhanced so that the protective tube 2 is also coaxial. Since the large-diameter coil portion 51 is stable without being disturbed, it can be smoothly inserted.

  The second small-diameter coil portion 52A is not fixed on the sheath outer peripheral surface 31, but is relatively movable in the axial direction and the rotational direction in a contact state. As in the present embodiment, there is a small-diameter coil portion 52 fixed on the outer peripheral surface of the sheath on one side of both sides in the coil axial direction of the large-diameter coil portion 51 of the coil spring 5, and a coil portion on the other side. However, it is preferable that the outer peripheral surface 31 is not fixed. If there are small-diameter coil portions on both sides of the large-diameter coil portion 51 and both of them are fixed to the outer peripheral surface of the sheath, the movement of the coil spring 5 in the torsional direction is restricted, and the sheath temperature during attachment / removal This is because even if the total 3 is rotated, the diameter is not reduced and the operability is reduced. If the other is free, this can be avoided.

  FIG. 5 shows a modification in which the small-diameter coil portion 52A on the rear end side is fixed to the sheath outer peripheral surface 31, and the small-diameter coil portion 52 on the front end side is not fixed and is free. Since the small-diameter coil portion 52 exists on the front end side, the attaching operation of the sheath thermometer 3 can be performed smoothly even if it is fixed on the rear end side, which is a preferred embodiment. However, in the example of FIG. 5, when inserting into the protective tube 2, the sheath thermometer 3 is inserted on the side opposite to the winding direction of the coil spring 5, that is, while rotating counterclockwise. If the winding direction of the coil spring 5 is reversed, it is possible to insert the coil spring 5 by turning it clockwise as in the first embodiment.

  FIG. 6 shows a modification in which the coil spring 5 is locked between the protrusions 7 and 7A formed on the outer peripheral surface 31 of the sheath. In this example, the coil spring 5 is constrained in the axial direction between the protrusions 7 and 7A. However, the protrusions 7 and 7A are further spaced apart so that the entire coil spring 5 can freely move in the axial direction by a predetermined distance. It is also possible to form with a gap and to attach the coil spring 5 between them. In this example, when the distal end portion of the coil spring 5 is bent and the sheath thermometer 3 is rotated clockwise, the distal end portion of the coil spring is locked to the protrusion portion 7 in the rotational direction so as to be integrally rotated to the right. It is composed. The rear end portion of the coil spring 5 may be bent so that the coil spring 5 is similarly locked to the protrusion 7A in the rotation direction and integrally rotated counterclockwise. In this case, when inserting into the protective tube 2, the sheath thermometer 3 is inserted on the side opposite to the winding direction of the coil spring 5, that is, while turning counterclockwise.

  In addition, as shown in FIG. 7, it is also a preferable example that the large-diameter coil portion includes two large-diameter coil portions 51A and 51B, and a third small-diameter coil portion 52B is provided therebetween. Thus, the coil spring 5 becomes more stable by providing the large-diameter coil portion at two positions with a space therebetween.

  Next, a third embodiment of the present invention will be described with reference to FIGS.

  In this embodiment, as shown in FIG. 8, a steady ring 6 fixed to the sheath outer peripheral surface 31 is provided together with the coil spring 5. As the steady rest ring 6 itself, conventionally known ones can be widely used. The coil spring 5 can reduce high frequency efficiently, but large vibration at low frequency takes time. Although the time can be shortened by increasing the wire diameter of the coil spring, the steady ring 6 can efficiently reduce such a large vibration to a small vibration.

  Therefore, in the case of such a situation involving large low-frequency vibrations, an anti-rest ring 6 is also provided as in the present embodiment so that large vibrations are efficiently reduced to small vibrations by the anti-rest ring. The high frequency can be further efficiently reduced by the coil spring 5, and the vibration can be efficiently suppressed as a whole. Since it is used in combination with the coil spring 5, it is possible to avoid the steady ring 6 from being worn early and becoming loose as in the prior art.

  The example of FIG. 8 is provided with a steady ring 6 on the tip side of the coil spring 5 of the first embodiment, and the example of FIG. 9 has a swing on the tip side of the coil spring 5 of the second embodiment. A stop ring 6 is additionally provided. In either case, the coil spring 5 and the steady ring 6 are independently fixed to the sheath outer peripheral surface 31. For example, as shown in FIG. 10, the small-diameter coil portion 52 of the coil spring 5 is fixed to the sheath outer peripheral surface 31. Those fixed to the steady ring 6 by welding or the like are also preferable. This facilitates the management of parts and the mounting work on the outer peripheral surface of the sheath.

  Moreover, as shown in FIG. 11, the steadying ring 6 can be made to function as the projection part 7A for latching of the coil spring 5, and especially the large diameter coil part 51 can be latched. Furthermore, although not shown in the drawing, it is of course possible to provide the coil spring 5 and the steady ring 6 at positions separated from each other in the axial direction. . In this example, as in the example of FIG. 6 described above, when the distal end portion of the coil spring 5 is bent and the sheath thermometer 3 is rotated clockwise, the distal end portion of the coil spring is locked to the protruding portion 7 in the rotational direction and integrated. It is configured to rotate rightward. The rear end of the coil spring 5 may be bent so that the coil spring 5 is similarly locked to the steady ring 6 as the projection 7A in the rotational direction and integrally rotated counterclockwise.

  Next, based on FIG.12 and FIG.13, 4th Embodiment of this invention is described.

  As shown in FIG. 12, the coil spring 5 of the present embodiment has a relatively long large-diameter coil portion 51 with a large-diameter coil portion 51 that contacts the inner peripheral surface 20 of the protective tube 2 as a larger number of turns. It is comprised as follows. As a result, the large-diameter coil portion 51 of the coil spring 5 exists in a region that is long in the axial direction of the gap 4, and the posture of the coil spring 51 is further stabilized and the vibration damping performance can be further improved. Further, when the large-diameter coil portion 51 is mounted in the axially long region of the gap 4 as described above, the total resistance force that the coil spring 5 receives from the inner peripheral surface of the protective tube 2 is increased, but the wire diameter is relatively small. By configuring as a soft coil spring, it is possible to keep the resistance force small and ensure smooth insertion.

  Such a relatively thin wire spring 5 is effective even when the gap 4 is narrow. That is, the coil spring 5 having a relatively long large coil portion 51 and a relatively small wire diameter as in this example is sufficiently long because it is long in the axial direction while ensuring insertability into the narrow gap 4. It is possible to maintain the sex.

  In this example, as shown in FIG. 12 (a), as a predetermined position in the axial direction in the gap 4, the protective tube 2 is exposed to the fluid and exposed to the fluid. A long coil spring 5 having a length extending from the distal end position of the sheath thermometer 3 to the pipe wall 9 is provided at a position extending over the area. The coil spring 5 of this example includes a small-diameter coil portion 52 that is fixed to the sheath outer peripheral surface 31 with respect to the large-diameter coil portion 51, and a second small-diameter coil portion on the opposite side to the large-diameter coil portion 51, as in the second embodiment. 52A is provided.

  However, unlike the second embodiment, the large-diameter coil portion 51 is configured to be long with a large number of windings, and a small-diameter coil portion 52, 52A having a small number of windings (about 2 windings in this example) is provided on both ends thereof. It is. The small-diameter coil portion 52 is fixed to the outer peripheral surface 31 of the distal end sealing portion of the sheath thermometer 3 by laser welding or the like (reference numeral 8 is the welded portion), and the second small-diameter coil portion 52A is fixed on the outer peripheral surface 31 of the sheath. Instead, they are in a state in which they can move relative to each other in the axial direction and the rotational direction in the contact state.

  In addition, instead of providing one long coil spring 5 having the same length as the large-diameter coil portion 51 as in this example, two or more large coil springs 5 are interposed via a small-diameter coil portion. A diameter coil portion 51 may be provided. Moreover, it is the same long coil spring 5, Comprising: The 2nd small diameter coil part 52A may be abbreviate | omitted similarly to 1st Embodiment. Further, as shown in FIG. 13, the coil spring 5 is also formed of a large number of large-diameter coil portions 51, and a coil spring 5 having a length over almost the entire region is provided at a position covering almost the entire region as a predetermined axial position of the gap 4. Is also a preferred example.

  In addition, the small-diameter coil portion 52 is not fixed and the second small-diameter coil portion 52A side is fixed, or the coil spring 5 is locked between the protrusions formed on the outer peripheral surface 31 of the sheath, or the steady rest Needless to say, the present invention can be configured in the same manner as the various modifications described in each of the above-described embodiments, such as a ring.

  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 Protective tube 3 Sheath thermometer 4 Gap 5 Coil spring 6 Ring 7, 7A Protrusion part 8 Welding part 9 Piping wall 20 Inner peripheral surface 21 Female thread part 31 Outer peripheral surface 32 Male thread part 51, 51A, 51B Large Diameter coil part 52, 52A, 52B Small diameter coil part 90 Fluid 91 Fixing member

Claims (3)

A temperature measuring device having a sheath thermometer mounted in a protective tube,
There is a gap between the inner peripheral surface of the protective tube and the outer peripheral surface of the sheath thermometer,
A coil spring comprising at least a large-diameter coil portion that contacts the inner peripheral surface of the protective tube and a small-diameter coil portion that contacts the outer peripheral surface of the sheath thermometer at a predetermined axial position of the gap,
The coil spring is locked on the outer peripheral surface of the sheath so as not to move at least to the base end side, or the small diameter coil portion is fixed on the outer peripheral surface of the sheath,
Of the two sides of the coil spring with respect to the large-diameter coil portion in the coil axial direction, the small-diameter coil portion fixed on the outer peripheral surface of the sheath exists on one side, and the coil portion extends further on the other side. However, the temperature measuring device is not fixed on the outer peripheral surface of the sheath. There is a second small-diameter coil portion on the other side, and the second small-diameter coil portion is not fixed on the outer peripheral surface of the sheath, and is in a state of being relatively movable in the axial direction and the rotational direction in contact with each other. The temperature measuring device according to claim 1 . A temperature measuring device having a sheath thermometer mounted in a protective tube,
There is a gap between the inner peripheral surface of the protective tube and the outer peripheral surface of the sheath thermometer,
A coil spring comprising at least a large-diameter coil portion that contacts the inner peripheral surface of the protective tube and a small-diameter coil portion that contacts the outer peripheral surface of the sheath thermometer at a predetermined axial position of the gap,
A temperature measurement device characterized in that a steady ring is provided on the outer peripheral surface of the sheath.

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