JP2017058229A - Sheath-type temperature measurement sensor and installation method of sheath-type temperature measurement sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheath-type temperature measurement sensor which can be easily inserted and installed into a bent pipe body such as a protection pipe and an existing pipe, is prevented in the deformation and breakage of the temperature measurement sensor even if a sensor tip abuts on an inner face of a steeply-bent portion of the pipe body at an angle near a right angle at insertion, is not influenced in insertion performance by a difference of a dimension and a raw material of the temperature measurement sensor, and can prevent a cost increase, and its installation method.SOLUTION: A sheath-type temperature measurement sensor comprises a sensor main body 2 which is composed of a metal sheath 20 and a temperature measurement part 21 arranged in the metal sheath, and bend guide means 3 composed of a coil spring 30 which is externally fit to an external peripheral side of the metal sheath 20 in a state of protruding to an axial direction by a prescribed length from a tip of the sensor main body 2. A protrusion region 33 protruding from a tip of the sensor main body of the coil spring 30 is smoothly bent along a bent portion inner face of the pipe body, and the sensor main body 2 at the inside is also bent from the tip side so as to be pressed by the bent coil spring 30, and made to smoothly pass the bent portion.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a sheath-type temperature sensor and a method for installing a sheath-type temperature sensor that can be easily inserted and installed in a bent protective tube or an existing tube.

  Conventionally, when the space to be temperature-measured has a complicated structure, or when there are other parts on the wall to be temperature-measured, the measurement of the sheath-type temperature sensor is at the appropriate temperature measurement position. A protective tube (guide pipe) bent to a predetermined shape is installed to position the warming part, and the temperature sensor is inserted while bending along the inner surface shape from the proximal end side of this protective tube, and the predetermined insertion position It is proposed to fix the outer peripheral surface of the metal sheath to the proximal end portion of the protective tube (see Patent Document 1). Also, in the situation where a temperature sensor that has already been installed fails and it is difficult to replace it, it is possible to use an existing pipe extending in the vicinity and insert a new temperature sensor inside it. It is considered.

  When a sheath type temperature sensor is inserted into such a bent protective pipe (guide pipe) or an existing pipe, it passes between the bent part of the protective pipe and the existing pipe about two places and the inner surface of the pipe and the temperature sensor The frictional force increases, and in particular when the sheath of the temperature sensor has a small diameter, it cannot be inserted midway. In particular, when the tip of the temperature sensor comes into contact with the inner surface of the bent part at an angle close to a right angle, it becomes a head-butted state and a force acts in the direction in which the temperature sensor bends between that point and the push-in part. become unable.

  On the other hand, a coil spring is put on the outside of the sheath type temperature sensor body, the tip of the coil spring is welded to the metal sheath, and inserted into the protective tube (guide pipe) from the welding side (tip side). It has also been proposed (see Patent Document 2). However, even in such a structure, when the sensor tip hits the inner surface of the bent portion where the bend is particularly sharp at an angle close to a right angle, the sheath tip may be bent in an extreme shape or may be damaged.

  The bendability is particularly important when the sensor tip first comes into contact with the inner surface. However, when the tip of the coil spring first bends and deforms, there is a temperature sensor at the center. The amount of bending becomes worse, and the extent to which the bending becomes worse depends on the outer diameter, thickness, etc. of the temperature sensor body (especially the metal sheath) and the material. It is necessary to set various coil springs corresponding to the coil spring, which causes an increase in cost.

JP 2008-128694 A JP 58-36105 A

  Therefore, in view of the above-described situation, the present invention intends to solve a sheath type temperature measuring sensor that can be easily inserted into and installed in a bent tube body such as a protective tube or an existing tube. Even if the sensor tip hits the inner surface of the bent part where the tube is bent at an angle close to a right angle, the temperature sensor is prevented from being deformed or damaged. It is in the point which provides the sheath type temperature sensor which can prevent cost increase, and its installation method.

  As a result of diligent investigation to solve the above-mentioned problems, the present inventor can prevent deformation and breakage of the tip of the sensor body by covering the coil spring in a state protruding in the axial direction from the sensor body tip, Further, since the sensor body does not exist at the protruding tip side portion of the coil spring that contacts the inner surface of the bent portion of the tubular body, its flexibility is kept constant regardless of the dimensions of the sensor body. It has been found that even when the dimensions and the like are changed, it is possible to achieve the same good bending guideability, and the cost can be reduced by sharing the parts, and the present invention has been completed.

  That is, the present invention is a sheath-type temperature sensor that is inserted into a tubular body, the sensor body including a metal sheath and a temperature measuring unit provided therein, and the sensor on the outer peripheral side of the metal sheath. A sheath type temperature measuring sensor comprising a bending guide means made up of a coil spring, which is packaged in a state protruding in the axial direction by a predetermined length from the tip of the main body, is configured.

  Here, it is preferable that the bending guide means includes a support portion that supports the base end portion of the coil spring so as not to move relative to the outer peripheral surface of the metal sheath at least in the base end direction.

  Further, it is preferable that a guide piece having a convex spherical tip surface is attached to the tip of the coil spring.

  Furthermore, it is preferable that the inner diameter of the coil spring is larger than the outer diameter of the metal sheath, and the coil spring is disposed with a gap with respect to the outer peripheral surface of the metal sheath.

  In addition, it is preferable that the coil spring is externally covered over almost the entire range of the sensor body inserted into the tube body.

  Further, it is preferable that the bending guide means is composed of two or more coil springs arranged in the axial direction.

  In particular, the coil spring located at the forefront among the coil springs is preferably set to a predetermined length and its base end is fixed on the outer peripheral surface of the metal sheath via a support member.

  In addition, it is preferable that the coil spring that is packaged so as to protrude from the tip of the sensor body is composed of two or more multi-coils.

  The present invention is also an installation method in which a sheath type temperature measuring sensor is inserted and installed inside a tubular body, and is provided on the outer peripheral side of the metal sheath of a sensor body comprising a metal sheath and a temperature measuring unit provided therein. A bending guide means comprising a coil spring which is externally provided in a state protruding in the axial direction by a predetermined length from the tip of the sensor body, and when the coil body is inserted into the tube body, The protruding portion of the spring is bent by contacting the bent inner surface, whereby the inner metal sheath is also bent, and the metal sheath can be passed along with the coil spring without being caught at the bent portion. An installation method of the sheath type temperature sensor is also provided.

  The sheath-type temperature measuring sensor according to the present invention and the installation method thereof according to the present invention as described above include a sensor main body comprising a metal sheath and a temperature measuring portion provided therein, and a distal end of the sensor main body on the outer peripheral side of the metal sheath. Bend guide means made of a coil spring that is sheathed in a state protruding in the axial direction from the predetermined length of the coil spring, when passing through a bent portion where the bend is abrupt when inserted into the tube, The portion of the sensor body that protrudes from the tip of the sensor body is smoothly bent along the inner surface of the bent portion without causing a head butt, and the metal sheath is also bent from the tip side by bending the coil spring. It bends as it is pushed by the spring and is smoothly inserted into the tube together with the coil spring.

  That is, in the present invention, when inserted into the tubular body, the bent portion of the tubular body is bent by bringing the protruding portion of the coil spring into contact with the bent inner surface, thereby bending the internal metal sheath. It is possible to pass the metal sheath together with the coil spring without being caught at the bent portion.

  In addition, the flexibility of the initial coil spring that contacts the inner surface of the bent portion of the tube affects the insertability into the tube, but the sensor body is located inside the protruding portion of the coil spring that contacts the initial. It does not exist, and its flexibility is not affected by differences in the dimensions and materials of the sensor body. Therefore, even if the type of sensor changes, the same coil spring can be used, and high costs can be avoided.

  In addition, since the tip of the sensor body is positioned inside the coil spring, the tip of the sensor body is prevented from directly contacting the inner surface of the tube and being deformed or damaged. The tip of the sensor body starts bending deformation in such a way that it is pushed and guided by the coil spring after being bent and deformed, so it does not receive the reaction force of the insertion work directly from the inner surface of the tube body. The sensor body is protected even during insertion work, and excellent quality can be maintained.

  Further, after passing through the bent portion of the tubular body at the time of insertion, the coil spring returns to the straight state by the elastic restoring force, and thereby the tip end portion of the sensor body is also returned straight. Therefore, the sensor body is also prevented from being bent and deformed in a complicated manner inside the coil spring. Since the contact between the outer surface of the coil spring and the inner wall of the tube is a point contact, there is little resistance, and even if the distance is long, it is possible to avoid being unable to insert in the middle due to frictional force.

  Further, since the bending guide means comprises a support portion that supports the base end portion of the coil spring so that it cannot move relative to the outer peripheral surface of the metal sheath at least in the base end direction, the support portion is pushed out in the insertion direction. The coil spring and the internal sensor body can move together in the insertion direction and can be inserted into the pipe body, and the tip of the sensor body jumps out of the tip of the coil spring during insertion. Things can be avoided more reliably. Moreover, such a support part can be realized with a simple structure.

  Further, since a guide piece having a convex spherical tip surface is attached to the tip portion of the coil spring, it is possible to more reliably prevent the above-described hooking and to contact the inner surface of the bent portion of the tubular body. Initial bending deformation at the time of contact can also be caused more smoothly and reliably. In addition to the bent portion of the tube, it is possible to avoid the tip of the coil spring from being caught even in a location where there is a protrusion on the inner surface, for example. It can be inserted.

  Further, since the inner diameter of the coil spring is larger than the outer diameter of the metal sheath and the coil spring is disposed with a gap with respect to the outer peripheral surface of the metal sheath, the inner surface of the spring is made of metal when the coil spring is bent. It is possible to prevent the bending of the sheath from being hindered by tightening the outer surface of the sheath, and it is possible to avoid a decrease in the flexibility of the coil spring and the sensor body.

  In addition, since the coil spring is sheathed over almost the entire range of the sensor body inserted into at least the inside of the tube, even if the metal sheath of the sensor body has a small diameter and is easily bent, it does not bend in the middle. The sensor body can be inserted and installed in the extended state through the coil spring.

  Since the bending guide means comprises two or more coil springs connected in the axial direction, the displacement of the axial position of the coil spring and the internal sensor body is dispersed particularly when inserted into a bent tube. In particular, on the distal end side, it is possible to set the length of the protruding portion to a fixed length, and to set the position of the temperature measuring part of the sensor body to the fixed position of the coil spring.

  If this is composed of one coil spring, the position of the tip of the coil spring and the position of the tip of the sensor body will be significantly different from the original due to the form of the tube, making it difficult to grasp the position of the temperature measuring section from the tip of the spring. The length of the protruding portion of the coil spring that protrudes from the tip of the sensor body also changes. When the length of the protruding portion changes in this way, the flexibility at the initial contact with the inner surface of the tube body changes. If it is composed of two or more coil springs, it is easy to fix the sensor body in the middle of the spring, and the above-described large deviation and change in the length of the protruding portion can be avoided.

  Specifically, for example, if the coil spring located at the forefront of the coil spring is set to a predetermined length, and its proximal end is fixed on the outer peripheral surface of the metal sheath via a support member By setting the predetermined length to a dimension shorter than the total length, the position of the temperature measuring unit from the tip of the coil spring can be fixed at a substantially fixed position, and the temperature measurement is performed regardless of the form of the tubular body. It is possible to position the part at a set point. In addition, the flexibility of the protruding portion is kept substantially constant during insertion, and excellent operability is maintained.

  Further, in the case where the coil spring that is packaged in a state protruding from the tip of the sensor body is composed of two or more multi-strip coils, flexibility and resilience are increased, and bending when passing through a bent portion of the tubular body And the restorability after passage are improved, and the insertability is improved.

The fragmentary longitudinal cross-section which shows the sheath type temperature measuring sensor which concerns on typical embodiment of this invention. The fragmentary longitudinal cross-section which shows the principal part of a sheath type | mold temperature sensor similarly. (A) is a longitudinal sectional view showing the principal part of the sheath-type temperature sensor, (b) is a longitudinal sectional view showing the principal part of a modification of the sheath-type temperature sensor, and (c) is the sheath-type temperature sensor. The longitudinal cross-sectional view which shows the principal part of the other modification of a sensor, (d) is a longitudinal cross-sectional view which shows the principal part of the other modification of a sheath type | mold temperature measurement sensor similarly. (A) is the perspective view which similarly shows the guide piece of a sheath type temperature measuring sensor, (b) is the perspective view which shows the support member which supports the coil spring of the front end side, (c) is the perspective view which similarly shows the modification of a support member. Figure. The perspective view which shows the support pipe which similarly supports the coil spring of the base end side of a sheath type | mold temperature measurement sensor. Explanatory drawing which similarly shows a mode that a sheath type | mold temperature measurement sensor passes the bending part of a tubular body.

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

  As shown in FIGS. 1 and 2, the sheath type temperature measuring sensor 1 of the present invention includes a sensor main body 2 including a metal sheath 20 and a temperature measuring unit 21 provided in the metal sheath 20, and an outer peripheral side of the metal sheath 20. Bending guide means 3 including a coil spring 30 is provided so as to protrude in the axial direction by a predetermined length from the tip of the main body 2.

  When inserting into a tube body such as a bent protective tube or an existing tube, the coil spring 30 is used so that the pushing force at the time of insertion is transmitted straight, and the bent portion is shown in FIG. As shown, the projecting portion 33 projecting from the tip of the sensor body of the coil spring 30 is smoothly bent along the inner surface 91 of the bent portion 90 of the tubular body 9, and is pushed by the bent coil spring 30. The inner sensor body 2 is also bent from the distal end side, and can smoothly pass through the bent portion 90.

  As the sensor body 2, a widely known one can be applied as long as it is a temperature sensor including the metal sheath 20 having flexibility. For example, a sheath thermocouple or a sheath resistance thermometer can be used. In this example, it is a sheath thermocouple for low temperature detection between the inner and outer tanks of the LNG tank, but is not limited to this. The mounting flange 4 and the terminal box 5 on the base end side are not particularly limited.

  In this example, the bending guide means 3 includes two coil springs 30 and 30A arranged in the axial direction and base end portions 30b and 30Ab of the respective coil springs at least in the base end direction with respect to the outer peripheral surface 22 of the metal sheath. Supporting portions 31 and 31A that are supported so as not to be relatively movable are provided. Of these coil springs 30, 30 </ b> A, the coil spring 30 positioned at the forefront (in this example, on the distal end side of the two) is set to a predetermined length, and its base end portion 30 b serves as the support portion 31. It is fixed on the metal sheath outer peripheral surface 22 by the support member 50.

  The distal end side of the coil spring 30 is projected from the distal end of the sensor body as the above-described projecting portion 33. The overall length in the axial direction of the coil spring 30, the protruding length of the protruding portion, the wire thickness, and the spring outer diameter depend on the type and size of the sensor body 2, but the metal sheath outer diameter of the sensor body 2 is 1. If it is 6 mm, for example, the total length of the coil spring 30 is about 500 to 1500 mm, the protruding length is about 5 to 200 mm, the wire thickness is about 0.5 to 1.5 mm, and the outer diameter is 5 to 10 mm. Set to degree. Of course, the present invention is not limited to such dimensions.

  A guide piece 32 having a convex spherical tip surface 32a is attached to the tip 30a of the coil spring 30 as shown in FIGS. Such a guide piece 32 can be omitted, but even when the bent portion of the tubular body is sharply bent, the guide piece 32 is present so that the distal end surface 32a extends along the inner surface of the bent portion. It moves smoothly and functions to prevent catching by head butt.

  The guide piece is preferably made of a metal such as stainless steel, and the distal end surface 32a is preferably a convex spherical shape, but may be any other shape as long as the shape is tapered. A partial spherical body having a larger diameter than the coil spring 30 may be used. Further, instead of providing a guide piece, the tip 30a of the coil spring 30 itself may be shaped so as to be gradually reduced in diameter as shown in FIG. The effect | action which the front-end | tip part 30a moves smoothly along the inner surface of a bending part can be show | played.

  The support member 50 as the support portion 31 that supports the base end portion 30b of the coil spring 30 is made of metal such as stainless steel, and as shown in FIGS. 3 (a) and 4 (b), on the metal sheath outer peripheral surface 22. The cylindrical main body 52 is fixed to the outer peripheral side of the cylindrical main body 52, and the cylindrical main body 52 is fixed to the outer peripheral surface 22 of the metal sheath by silver brazing or welding. The base end portion 30b is fixed to the support plate 53 by welding.

  Here, as shown in FIGS. 3 (b) and 4 (c), the support member 50 sets the axial length of the cylindrical body 52 to a predetermined length of 3 mm or more on the metal sheath outer peripheral surface 22. On the other hand, in addition to those fixed by silver soldering or welding, those fixed by caulking are preferable in that it is not necessary to apply heat that may cause damage to the sensor body 2. Further, as shown in FIG. 3D, a small-diameter portion 34 in which the spring diameter is partially set relatively small is provided in the middle of the protruding portion 33 of the coil spring 30 so that the spring is easily bent at the portion. A structure, particularly a structure that can facilitate initial bending, is also preferable.

  The proximal end side coil spring 30 </ b> A is sandwiched between the support member 31 </ b> A for fixing the proximal end portion 30 </ b> Ab and the support member 50. As shown in FIGS. 2 and 5, the support portion 31A is fixed on the metal sheath outer peripheral surface 22 by welding, silver brazing, caulking, or the like, and receives the base end portion 30Ab of the coil spring 30A on the front end side. The support pipe 51 is made of a metal such as stainless steel having an opening 51a. The opening 51a is formed with a plurality of slit portions 54 extending a predetermined length on the base end side at a predetermined interval in the circumferential direction, and is configured to hold the coil spring base end portion 30Ab firmly.

  The inner diameters of the coil springs 30 and 30 </ b> A are set to be larger than the outer diameter of the metal sheath 20, and the coil springs 30 and 30 </ b> A are disposed with respect to the metal sheath outer peripheral surface 22 via a gap s. Therefore, even when the coil springs 30 and 30A are bent when passing through the bent portions of the tube, the inner surface of the spring tightens the outer surface of the metal sheath and the bending is hindered even if the inner diameter is slightly reduced. This prevents the flexibility of the coil spring and the sensor body, i.e., the insertion property, from being deteriorated.

  The coil springs 30 and 30 </ b> A cover almost the entire range of at least the inside of the tube body of the sensor body 2. Therefore, even if the metal sheath 20 has a small diameter and is easily bent, the metal sheath 20 is inserted together with the coil springs 30 and 30A. Therefore, the metal sheath 20 can be pushed and inserted through the coil spring to the end without bending. Of course, depending on the size of the metal sheath 20 and the like, there are cases where insertion is possible without covering almost the entire range with a coil spring. In that case, for example, only the distal end side coil spring 30 may be used, and the other proximal end side coil spring 30A may be omitted.

  Further, two or more (in this example, two) coil springs are not provided in series, but only one coil spring may be used so as to cover, for example, substantially the range as described above. However, in that case, since the coil spring is long and the tip position protruding from the sensor body 2 is greatly displaced depending on the form of the tube, it is preferable to fix the middle part to the outer peripheral surface 22 of the metal sheath body.

  In this example, the middle part of one coil spring is not fixed in this way, but a plurality of coil springs 30 and 30A are connected via a support part. Is set to a relatively short predetermined length, and the base end portion thereof is fixed by the support portion 31, so that the relative position between the tip end of the coil spring 30 and the tip end of the sensor body 2 can be maintained substantially constant. It is possible to fix the coil spring 30 at a fixed position as set from the tip. Further, the bendability of the projecting portion 33 of the coil spring 30 is also kept substantially constant during insertion, and excellent operability is maintained.

  As an example of configuring a plurality of coil springs, in this example, two or more coil springs are connected in the longitudinal direction, but a plurality of coil springs having different diameters are coaxially stacked in an inner and outer double. Is also possible. Furthermore, it may be configured as two or three or more multi-strand coils in close contact with each other. In particular, if a state-of-the-art coil spring including a protruding portion is configured as a multi-strand coil spring, flexibility and resilience are increased, and flexibility can be improved.

  Hereinafter, based on FIG. 6, the deformation | transformation operation | movement at the time of inserting the sheath type temperature measuring sensor 1 in the inside of the tubular body 9 is demonstrated.

  As shown in (a) in the figure, when the tip reaches the bent portion 90 of the tube body 9, first, the inner surface 91 is provided at the tip of the protruding portion 33 of the coil spring 30 on the tip side constituting the bending guide means 3. Since the guide piece 32 is in contact with it and its tip is a convex spherical surface, the guide piece 32 moves smoothly along the inner surface 91, and the protruding portion 33 is bent and deformed along the inner surface 91 as shown in FIG. Go. The flexibility of the coil spring 30 is better than that of a metal sheath, and the direction easily changes.

  When the tip of the internal sensor body 2 hits the inner surface of the coil spring 30 that is bent, the inner surface of the sensor body 2 is pushed against the inner surface as the coil spring 30 is bent as shown in FIGS. Thus, bending deformation starts in the same direction. Therefore, the sensor body 2 is smoothly bent and inserted while being guided by the coil spring 30 without causing head deformation and deformation.

  When the distal end of the sensor body 2 passes through the bent portion 90 of the tube body 9, the protruding portion 33 of the coil spring 30 returns straight as shown in FIGS. It is pushed again in the direction in which the bending deformation returns, and gradually returns straight.

  Thus, when passing through the bent portion 90 of the tube body 9, the sensor body 2 is bent and deformed so as to be guided by the bending deformation of the coil spring 30, and proceeds smoothly. Further, since the coil spring 30 is in direct contact with the inner surface of the bent portion 90, it becomes a point contact and the resistance is very small. Even if the bent portion 90 passes through the bent portion 90 a plurality of times, the resistance increases and the insertion is impossible. Is also avoided. In the case where there is a large gap between the coil spring 30 and the inner surface of the tube body, it is also preferable in terms of facilitating insertion that a separate guide pipe is inserted to suppress the gap and prevent the coil spring from buckling.

  The coil springs 30 and 30A described above have been described on the premise that they are close contact coil springs (tensile coil springs) including the drawings, but the same can be said for compression coil springs with a gap. The “coil spring” may be a close coil spring, a compression coil spring, or a combination thereof. When the coil spring is a close-contact coil spring, the pressing force during insertion acts evenly, and even if the coil spring comes into contact with the inner surface of the tube body, it does not bend easily and has excellent straight running stability. Even if there is, etc., there is no gap, so there is no risk of being caught and the dimensional stability in the length direction is also excellent.

  In particular, when the coil spring (in the above embodiment, the coil spring 30) that is externally projected from the tip of the sensor body is a close-contact coil spring, the tip of the sensor body is difficult to be caught even when bent. Excellent dimensional stability and high design freedom. When a compression coil spring is used, the tip of the sensor body is relatively easy to get caught in the gap of the coil spring not only when bent but also when going straight, and contraction occurs when the tip of the spring hits the bent part of the tube. Because the projecting dimensions from the tip of the body fluctuate, it is easy to be restricted in terms of design, such as a length that prevents the sensor body from popping out and a gap between the springs, but on the inner surface of the bent part of the tube, By pushing further in the state where the tip of the spring is in contact, the spring is stored with repulsive energy, and since there is no core such as a sensor inside the protruding spring, the spring bends and curves, and the above-mentioned repulsive energy causes the shaft angle of the tip. The tip of the spring that is in contact with the inner surface of the tube can be easily slid on the inner surface of the tube by rotating it back and forth, right and left by the operation on the base end side, and the sensor body can be easily inserted. In addition, about the rear end side (coil spring 30A in the said embodiment) from a support part, it is preferable that it is an adhesion | attachment spring with equal pushing force.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to such an Example at all, In the range which does not deviate from the summary of this invention including material, a dimension, etc., it can implement in various forms. Of course.

DESCRIPTION OF SYMBOLS 1 Sheath type temperature measuring sensor 2 Sensor main body 3 Bending guide means 4 Flange 5 Terminal box 9 Tubing body 20 Metal sheath 21 Temperature measuring part 22 Outer peripheral surface 30, 30A Coil spring 30a Tip part 30b Base end part 30Ab Base end part 31 Support part 31A Support part 32 Guide piece 32a Tip surface 33 Projection part 34 Small diameter part 50 Support member 51 Support pipe 51a Opening part 52 Cylindrical main body 53 Support plate 54 Slit part 90 Bending part 91 Inner surface s Gap

Claims (9)

A sheath-type temperature measuring sensor inserted into the tube body,
A sensor body composed of a metal sheath and a temperature measuring unit provided therein; and
Bending guide means comprising a coil spring that is externally mounted on the outer peripheral side of the metal sheath so as to protrude in the axial direction by a predetermined length from the tip of the sensor body;
A sheath type temperature sensor comprising:   The sheath-type temperature measuring sensor according to claim 1, wherein the bending guide means includes a support portion that supports a base end portion of the coil spring so as not to move relative to an outer peripheral surface of the metal sheath at least in the base end direction.   The sheath-type temperature measuring sensor according to claim 1 or 2, wherein a guide piece having a convex spherical tip surface is attached to a tip portion of the coil spring.   The sheath type according to any one of claims 1 to 3, wherein an inner diameter of the coil spring is larger than an outer diameter of the metal sheath, and the coil spring is disposed with a gap with respect to an outer peripheral surface of the metal sheath. Temperature sensor.   The sheath type temperature measuring sensor according to any one of claims 1 to 4, wherein the coil spring is sheathed over substantially the entire range inserted into at least the inside of the tube body of the sensor body.   The sheath-type temperature measuring sensor according to any one of claims 1 to 5, wherein the bending guide means includes two or more coil springs that are continuously provided in the axial direction.   The sheath type measurement according to claim 6, wherein a coil spring located at the forefront of the coil spring is set to a predetermined length, and a base end portion thereof is fixed on the outer peripheral surface of the metal sheath via a support member. Temperature sensor.   The sheath-type temperature measuring sensor according to any one of claims 1 to 7, wherein the coil spring packaged in a state of projecting from the tip of the sensor body is composed of two or more multi-strip coils. An installation method in which a sheath type temperature measuring sensor is inserted and installed inside a tubular body,
A bending guide made of a coil spring that is externally attached to the outer circumference of the metal sheath of the sensor body comprising a metal sheath and a temperature measuring portion provided in the sheath so as to protrude axially from the tip of the sensor body by a predetermined length. Providing means,
When inserting into the inside of the tubular body, the bent portion of the tubular body is bent by bringing the protruding portion of the coil spring into contact with the bent inner surface,
An installation method of a sheath-type temperature measurement sensor that allows an internal metal sheath to be bent by this and allows the metal sheath to pass through the coil spring without being caught at the bent portion.

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