JP2016191594A - Jig for installing sensor to cylindrical member surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sensor installation jig designed such that a sensor can be installed in close contact with a surface of a cylindrical member at the same pressure no matter who attaches the sensor, that eliminates any individual difference between workers, and that prevents insufficient installation pressure of the sensor and installation error.SOLUTION: A jig for installing a sensor to a surface of a cylindrical member comprises: a fixing member 2 fixed to a surface of the cylindrical member; a lid member 3 attached to the fixing member 2; and an elastic member 22 that brings the sensor 6 into pressure contact with the surface of the cylindrical member. On the fixing member 2, a pair of rail parts 11 are formed arranged in parallel with each other with a predetermined space therebetween. The elastic member 22 is arranged on the underside of the lid member 3, and the lid member 3 is attached to the fixing member 2. Thereby, the sensor 6 is brought into pressure contact with the surface of the cylindrical member by the elastic member 22, and the underside of the lid member 3 is set at a predetermined distance from the surface of the cylindrical member.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a jig for installing various sensors on the surface of a cylindrical member.

  Various measurements may be performed by installing a sensor on the surface of the cylindrical member. For example, as an example of a cylindrical member, the present applicant discloses a flow rate measuring device and a flow rate measuring method disclosed in Patent Document 1 as a method for detecting the flow rate of a fluid flowing in a pipe from the surface temperature of the pipe. According to the invention of Patent Document 1, the temperature of the fluid flowing through the pipe is detected by the first temperature sensor, and heat is applied to the surface of the pipe on the downstream side of the fluid flow from the first temperature sensor. By detecting the temperature of the fluid flowing through the pipe with the second temperature sensor while transferring heat to the fluid flowing in the pipe, the piping itself does not need to be processed and the distance between the temperature measurement points can be shortened. The flow rate of the fluid can be easily measured from the outer surface of the pipe. The invention of Patent Document 1 is a technique for obtaining the flow rate from the difference (temperature difference) between the second temperature sensor installed at the lower part of the heater and the first temperature sensor installed upstream of the heat deprived by the fluid. Therefore, improving the temperature measurement accuracy and stability leads to an improvement in the flow rate measurement accuracy.

  In order to measure the temperature of the pipe surface accurately and stably, it is important to keep the adhesion of the temperature sensor to the pipe surface constant. For this purpose, it is necessary to install (press) the temperature sensor on the pipe surface with an arbitrary pressure. In the invention of Patent Document 1, the base member is compressed using a magnet, and the temperature sensor is fixed to the pipe surface using the reaction force. However, this method cannot be used for piping that does not have magnets, such as SUS piping. Furthermore, the magnet has a characteristic of demagnetizing as the temperature increases. Therefore, when the temperature of the object to be measured (piping surface temperature) is high or when the temperature fluctuates greatly, the magnetic force decreases during the measurement, and the installation pressure drops or drops due to the jig coming off the pipe surface. There is a possibility. Although it is conceivable to use a strong magnet that can withstand high temperatures, this leads to an increase in cost. Moreover, when fixing a jig | tool to the piping surface using magnetic force, even if a jig | tool is not parallel with respect to piping, there exists a possibility that it can install. In this case, the installation pressure of the sensor is reduced as compared with the case where the jig is attached to the pipe in parallel, resulting in an attachment error.

  On the other hand, as a fixing method different from the above, the present applicant discloses a fixing device of Patent Document 2. In this invention, a tape is stretched between the angles, and the sensor is fixed to the pipe surface using the reaction force of the tape. However, with this technique, it is necessary to keep the tension of the entire tape stretched between the angles uniform. If the tension of the tape becomes non-uniform, the installation pressure becomes uneven, making it difficult to measure the temperature stably. Further, in this fixing method, when the jig is not attached to the pipe in parallel, it can be determined that the jig is unstable and not properly installed. In that case, it is necessary to correct it to a normal state, but at that time, there is a high possibility that a twist occurs between the tape and the sensor, resulting in a change in installation pressure and, consequently, an installation error.

JP 2013-205310 A JP 2014-085185 A

  Therefore, the object of the present invention is to install the sensor in close contact with the surface of the cylindrical member with the same pressure regardless of who installs it, there is no individual difference among operators, and there is no shortage of installation pressure of the sensor or installation error does not occur. It is in providing tools.

  According to the present invention for solving the above problems, a jig for installing a sensor on the surface of a cylindrical member, a fixing member fixed to the surface of the cylindrical member, a lid member attached to the fixing member, and the cylindrical member An elastic member for pressing the sensor on the surface of the fixing member, and the fixing member is formed with a pair of rail portions arranged in parallel with each other at a predetermined interval, and the elastic member is attached to the lower surface of the lid member. The sensor is pressed against the surface of the cylindrical member by the elastic member, and the lower surface of the lid member is set at a predetermined distance from the surface of the cylindrical member. A sensor installation jig on the surface of a cylindrical member is provided.

  Moreover, according to this invention, it is a jig | tool which installs a sensor on the surface of a cylindrical member, Comprising: The fixing member fixed to the surface of a cylindrical member, The lid member attached to the said fixing member, In the state which is not compressed An elastic member having a height higher than that of the fixing member, and the fixing member is formed with a pair of rail portions arranged in parallel with each other at a predetermined interval, and the elastic member is connected to the lid member. By attaching the lid member to the fixing member, the sensor is pressed against the surface of the cylindrical member by the elastic member, and the lower surface of the lid member becomes a predetermined distance from the surface of the cylindrical member. A sensor installation jig on the surface of a cylindrical member is provided.

  In this sensor installation jig, the lid member may be attached to the fixing member by a bolt and a nut. Further, the lid member may be attached to the fixing member directly or via a sleeve. Further, folded portions that protrude outward from the cylindrical member may be formed at both ends of the fixing member that are in the longitudinal direction of the cylindrical member when installed on the cylindrical member. The sensor includes at least a first temperature sensor and a second temperature sensor, and includes a positioning means for positioning the lid member and the fixing member relative to each other when the sensor is installed on the cylindrical member. The first temperature sensor and the second temperature sensor are mounted on the inner surface of the elastic member so that the first temperature sensor and the second temperature sensor are aligned along the axial direction of the cylindrical member when Also good.

  By using the sensor installation jig of the present invention, the sensor can be installed in close contact with the surface of the cylindrical member with the same pressure no matter who is installed, there is no individual difference by the operator, and there is insufficient sensor installation pressure or installation error. Occurrence can be avoided. Thereby, for example, it becomes possible to accurately detect the flow rate of the fluid flowing in the pipe.

It is a perspective view of the sensor installation jig which concerns on embodiment of this invention. It is an exploded view of the sensor installation jig which concerns on embodiment of this invention. It is explanatory drawing of the state which attaches a fixing member to the surface of piping. It is sectional drawing of the sensor installation jig attached to the surface of piping. It is sectional drawing which shows the state from which the amount of compression of an elastic member changes because the apertures of piping differ. It is sectional drawing which shows embodiment which inserted the sleeve between the cover member and the fixing member. It is a perspective view of the elastic member with which the 1st temperature sensor and the 2nd temperature sensor were mounted | worn on the inner surface.

  Hereinafter, a sensor installation jig 1 according to an embodiment of the present invention will be described with reference to the drawings. In the present specification and drawings, elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIGS. 1 and 2, a sensor installation jig 1 according to an embodiment of the present invention includes a fixing member 2 fixed to the surface of a cylindrical member such as a pipe, and a lid member 3 attached to the fixing member 2. The elastic member 22 for pressing the sensor onto the surface of the cylindrical member is provided. The fixing member 2 has a so-called gate shape, and a pair of rail portions arranged parallel to each other at a predetermined interval by bending the left and right ends of the rectangular top plate portion 10 downward with a press or the like. 11 is formed. The pair of rail portions 11 have the same height and have a uniform height over the entire length in the longitudinal direction. That is, when the fixing member 2 is placed on the horizontal plane, the bottom surface of the rail portion 11 is in contact with the horizontal plane at all the parts, and the top plate portion 10 is parallel to the horizontal plane. As will be described later, when the fixing member 2 is fixed to the surface of the cylindrical member (pipe 5), the lower ends of the pair of rail portions 11 are brought into close contact with the surface of the cylindrical member (pipe 5), thereby It is attached so that the longitudinal direction coincides with the longitudinal direction of the cylindrical member (pipe 5).

  In the fixing member 2, an opening 12 for passing an elastic member 22 described later is provided in the center of the top plate portion 10. The opening 12 is large enough to allow the elastic member 22 to pass through. In addition, a pair of bolts 13 are vertically attached near the both ends in the longitudinal direction of the top plate portion 10. Note that “upwardly” means that when the fixing member 2 is fixed to the surface of the cylindrical member (pipe 5), it goes toward the outside in the radial direction of the cylindrical member (pipe 5). Moreover, a pair of folding | returning parts 14 which protrude upwards are formed in the both ends of the longitudinal direction of the top-plate part 10. As shown in FIG.

  The lid member 3 has a lid top plate portion 20 disposed at a position covering the top of the top plate portion 10 of the fixing member 2 and a pair of cover portions 21 disposed at a position covering the outside of the rail portion 11 of the fixing member 2. have. The pair of cover portions 21 are formed by bending the left and right ends of the rectangular lid top plate portion 20 downward, and are parallel to each other. Further, the inner dimension between the cover members 21 and 21 of the lid member 3 and the outer dimension between the rail portions 11 and 11 of the fixing member 2 are substantially the same.

  On the lower surface of the lid top plate portion 20 of the lid member 3 (the surface facing the upper surface of the top plate portion 10 of the fixing member 2), an elastic member 22 for uniformly pressing the sensor to the surface of the cylindrical member is provided. The sensor pressed against the surface of the cylindrical member is, for example, a temperature sensor or a combination of a temperature sensor and a heater. The material used for the elastic member 22 is preferably silicon rubber that has heat resistance and stable compression set. The size of the elastic member 22 is set to a size necessary for pressing the sensor against the surface of the cylindrical member or more. The elastic member 22 has a rectangular parallelepiped shape, and the upper surface of the elastic member 22 is attached to the center of the lower surface of the lid top plate portion 20 so that the longitudinal direction of the elastic member 22 coincides with the longitudinal direction of the lid top plate portion 20. Yes. The elastic member 22 has a height higher than that of the fixing member 2 in a state where the elastic member 22 is not compressed. In this embodiment, an example in which the elastic member 22 is attached to the lid member 3 will be described. However, the elastic member 22 may be separate from the lid member 3.

  The lid top plate portion 20 of the lid member 3 is provided with a pair of holes 25 through which the bolts 13 attached to the top plate portion 10 of the fixing member 2 are passed. When attaching the lid member 3 to the fixing member 2, the bolts 13 are passed through the holes 25, the lid top plate portion 20 of the lid member 3 is overlaid on the top plate portion 10 of the fixing member 2, and the nut 26 is bolted from above. 13 and the lid member 3 is fixed to the fixing member 2 by tightening the nut 26. At this time, as described above, the inner dimension between the cover members 21 and 21 of the lid member 3 and the outer dimension between the rail portions 11 and 11 of the fixing member 2 are substantially the same. The inner side abuts on the outer side of the rail portion 11 of the fixing member 2, and the fixing member 2 and the lid member 3 are positioned in the horizontal direction. In this way, the configuration in which the inner side of the cover member 21 of the lid member 3 is in contact with the outer side of the rail portion 11 of the fixing member 2 corresponds to the positioning means in the present invention. Note that the configuration of the positioning means is not limited to this.

  When attaching the lid member 3 to the fixing member 2 in this way, the elastic member 22 provided on the lower surface of the lid top plate portion 20 of the lid member 3 is passed through the opening 12 provided in the center of the top plate portion 10. The For this reason, the lid top plate portion 20 of the lid member 3 can be placed on the top plate portion 10 of the fixing member 2 without being disturbed by the elastic member 22. The lid member 3 and the fixing member 2 are both made of metal here.

  Next, a method for attaching the sensor to the surface of the cylindrical member using the sensor installation jig 1 according to the embodiment of the present invention will be described. As an example of the cylindrical member, a case where a film sensor 6 made of a temperature sensor or a combination of a temperature sensor and a heater is attached to the surface of the pipe 5 will be described.

  First, as shown in FIG. 3, the sensor 6 is arranged on the surface of the pipe 5, and the fixing member 2 is brought into contact with the surface of the pipe 5 so as to surround the sensor 6. In this case, if the sensor 6 is temporarily fixed to the surface of the pipe 5 using a curing tape or the like, the operation is easy. Further, the sensor 6 arranged on the surface of the pipe 5 is positioned so as to come under the opening 12 in the top plate portion 10 of the fixing member 2, and the fixing member 2 is brought into contact with the surface of the pipe 5. . Further, when the fixing member 2 is brought into contact with the surface of the pipe 5, the lower ends of the pair of rail portions 11 formed at the left and right ends of the top plate portion 10 are brought into close contact with the surface of the pipe 5. Since the pair of rail portions 11 arranged in parallel with each other have the same height and have a uniform height over the entire length in the longitudinal direction, the pair of rail portions 11 are thus formed. When the fixing member 2 is fixed by bringing the lower end into close contact with the surface of the pipe 5, the lower end of the pair of rail portions 11 is necessarily brought into close contact with the surface of the cylindrical member (pipe 5). In this state, the longitudinal direction of the top plate portion 10 coincides with the longitudinal direction of the pipe 5.

  In this way, the sensor 6 disposed on the surface of the pipe 5 is aligned so that the sensor 6 is directly below the opening 12 in the top plate portion 10 of the fixing member 2, and the longitudinal direction of the top plate portion 10 of the fixing member 2 is set in the pipe. 5, the fixing member 2 is brought into contact with the surface of the pipe 5, and the band 30 is passed around the top plate portion 10 of the fixing member 2 and wound around the pipe 5. In this way, the fixing member 2 is fixed to the surface of the pipe 5 with the band 30. The position to be pressed by the band 30 is set as close as possible to both ends in the longitudinal direction of the top plate portion 10 so that the band 30 does not get in the way when the lid member 3 is overlaid on the fixing member 2 later. In addition, since the folding | returning part 14 is formed in the both ends of the longitudinal direction of the top-plate part 10, there is no fear that it will remove | deviate from the top-plate part 10 even if the band 30 is brought close to both ends.

  Next, the lid member 3 is attached to the fixing member 2 fixed to the surface of the pipe 5. In this case, as described above with reference to FIGS. 1 and 2, the pair of bolts 13 provided in the vicinity of both ends of the top plate portion 10 of the fixing member 2 are provided in the holes provided in the lid top plate portion 20 of the lid member 3. 25, the lid top plate portion 20 of the lid member 3 is overlaid on the top plate portion 10 of the fixing member 2. Then, the nut 26 is attached to the bolt 13 from above the lid member 3, and the nut 26 is tightened to fix the lid member 3 to the fixing member 2. When the lid member 3 is fixed to the fixing member 2 in this way, the positioning means described above (in this embodiment, the inside of the cover member 21 of the lid member 3 abuts on the outside of the rail portion 11 of the fixing member 2 and is positioned. Therefore, the fixing member 2 and the lid member 3 are positioned in the horizontal direction. As a result, the longitudinal direction of the lid top plate portion 20 of the lid member 3 and the longitudinal direction of the elastic member 22 are It will be in the state which matched with the longitudinal direction.

  Further, as shown in FIG. 4, the lid top plate portion 20 of the lid member 3 is overlaid on the top plate portion 10 of the fixing member 2, thereby being attached to the lower surface of the lid top plate portion 20 of the lid member 3. The elastic member 22 is passed through the opening 12 provided in the center of the top plate portion 10. Since the elastic member 22 has a height higher than that of the fixing member 2 in an uncompressed state, when the lid member 3 is fixed to the fixing member 2, the sensor 6 disposed on the surface of the pipe 5 is The sensor 6 is pressed against the surface of the pipe 5 by being uniformly pressed by the lower surface of the elastic member 22 (the surface facing the surface of the pipe 5). As a result, the sensor 6 is installed in close contact with the surface of the pipe 5.

  It is assumed that the band 30 used for fixing the fixing member 2 to the surface of the pipe 5 can sufficiently withstand the repulsive force generated when the sensor 6 is crimped by the elastic member 22. Further, since the elastic member 22 spreads in the lateral direction when the sensor 6 is pressure-bonded, it is desirable that the size of the opening 12 provided in the top plate portion 10 of the fixing member 2 is one size larger than the circumference of the elastic member 22. When the opening 12 is the same size as the periphery of the elastic member 22, a part of the elastic member 22 compressed at the time of attachment is the lower surface of the lid top plate portion 20 of the lid member 3 and the top plate portion 10 of the fixing member 2. This is because there is a possibility of entering between the upper surface and being caught.

  By using the sensor installation jig 1 of the present invention, the sensor 6 can be installed in close contact with the surface of the pipe 5 with the same pressure no matter who is attached. When the nut 26 is sufficiently tightened and the lower surface of the lid top plate portion 20 and the upper surface of the top plate portion 10 of the fixing member 2 come into contact with each other, the nut 26 will not turn even if it is tightened further. Accordingly, it can be determined that the nut 26 is securely tightened, and the distance from the lower surface of the lid top plate portion 20 to the surface of the pipe 5 can be kept constant regardless of who attaches the nut 26. As a result, the elastic member 22 can be compressed to a certain ratio, and the sensor 6 can be fixed to the surface of the pipe 5 with a certain pressure. Further, since the tightening may be performed until the nut 26 does not turn as described above, there is no need to use a special tool such as a torque wrench or to install a person with special skills. Further, by managing the fixing member 2 so as to have an arbitrary height at the time of manufacture, it is possible to avoid mounting errors due to individual differences of jigs. Thus, the lid member 3 can always be fixed to the fixing member 2 under the same conditions, and there is no individual difference among operators, and it is possible to avoid a shortage of installation pressure of the sensor 6 and occurrence of installation errors. Thereby, the measurement accuracy is stabilized, and for example, the flow rate of the fluid flowing in the pipe can be detected with high accuracy.

  As shown in FIG. 5, by fixing the sensor 6 using the sensor installation jig 1, the elastic member 22 is sandwiched between the sensor 6 (pipe 5) and the lower surface of the lid top plate portion 20 of the lid member 3. Compressed. At this time, the elastic member 22 presses the sensor 6 with an arbitrary force while deforming according to the shape of the surface of the pipe 5. Therefore, even if the diameter of the pipe 5 to be installed is different, the sensor 6 can be brought into close contact with the surface of the pipe 5 using the sensor installation jig 1. Here, the compression amount F of the elastic member 22 increases as the diameter of the pipe 5 decreases. When the compression amount F changes, the degree of adhesion of the sensor 6 to the surface of the pipe 5 changes and affects the measurement result. For this, data is taken for each diameter of the pipe 5 using the sensor installation jig 1 fixed at an arbitrary height, and correction is performed. Alternatively, as shown in FIG. 6, a sleeve (height adjustment plate, spacer, etc.) 31 is sandwiched between the lower surface of the lid top plate portion 20 of the lid member 3 and the upper surface of the top plate portion 10 of the fixing member 2. The height of the lid member 3 when the nut 26 is tightened may be adjusted so that the elastic member 22 is compressed at a constant rate even if the diameter is different.

  Further, since the pair of rail portions 11 formed at the left and right ends of the top plate portion 10 are the same height and uniform over the entire length in the longitudinal direction, the lower end of the rail portion 11 is brought into close contact with the surface of the pipe 5. Accordingly, the longitudinal direction of the top plate portion 10 of the fixing member 2 can be attached so as to coincide with the longitudinal direction of the pipe 5. If the sensor installation jig 1 is attached obliquely to the pipe 5, it can be seen that the sensor installation jig 1 becomes unstable and is not attached in parallel. When the fixing member 2 is not firmly fixed to the pipe 5 with the band 30, the fixing member 2 is lifted by the repulsive force of the elastic member 22 when the nut 26 is tightened. Therefore, when the sensor 6 is fixed by the sensor installation jig 1, the state of whether the rail portion 11 of the fixing member 2 is lifted from the surface of the pipe 5 is checked to visually check the looseness of the band 30 on site. I can confirm. If the rail portion 11 is not lifted, the installation is good, and if the rail portion 11 is lifted, the installation is poor.

  Further, if water or the like flows in the pipe 5 during operation of the pipe 5, minute vibrations are generated. It is conceivable that the band 30 falls off from the top plate portion 10 of the fixing member 2 during the measurement due to the vibration. However, since the folded portions 14 are formed at both ends in the longitudinal direction of the top plate portion 10, the band 30 can be prevented from coming off from the top plate portion 10 and can be prevented from falling off during measurement.

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to this example. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

  In the mounting procedure described above, an example in which the sensor 6 is first arranged on the surface of the pipe 5 is shown. However, if the sensor 6 is not installed at a predetermined position with respect to the pipe 5, the sensor 6 is sandwiched between the lower end of the rail portion 11 and the pipe 5 when the fixing member 2 is fixed, and the sensor 6 is sheared. It can be considered. In order to prevent such a problem, the sensor 6 may be mounted in advance on the lower surface (inner surface) of the elastic member 22. By doing so, by pressing the elastic member 22 with which the sensor 6 is integrated, the sensor 6 is always arranged at a predetermined position, leading to a reduction in mounting error. It also leads to improved workability of installation. Further, the sensor 6 may be a heater, or a combination of the first temperature sensor 6a and the second temperature sensor 6b as disclosed in Patent Document 1. In the technique of measuring with such a combination of the first temperature sensor 6a and the second temperature sensor 6b, the second temperature sensor 6b in which the heat deprived by the fluid (heat imparted by the heater) is installed in the lower part of the heater and its When determining the flow rate from the difference (temperature difference) between the first temperature sensors 6a installed on the upstream side, the first temperature sensor 6a and the second temperature sensor 6b are in the axial direction of the pipe 5 (that is, the direction in which the fluid in the pipe flows). If they are not arranged side by side, the flow rate measurement accuracy decreases. In order to prevent this, as shown in FIG. 7, the first temperature sensor 6 a and the second temperature sensor 6 b are arranged along the axial direction of the pipe 5 on the inner surface of the elastic member 22 (the face facing the surface of the pipe 5). It may be pre-positioned and mounted so as to be arranged in a line.

  Further, the means for fixing the fixing member 2 to the pipe 5 may not be the band 30. For example, as shown in Patent Document 1, it is possible to fix using a magnet. Further, the means for attaching the lid member 3 to the fixing member 2 may not be the bolt 13 and the nut 26. For example, the fixing member 2 and the lid member 3 may be attached with a clip sandwiched by an urging force such as a spring. .

  The present invention is suitable when various sensors are installed on the surface of a cylindrical member such as a pipe.

DESCRIPTION OF SYMBOLS 1 Sensor installation jig 2 Fixing member 3 Lid member 5 Piping 10 Top plate part 11 Rail part 12 Opening part 13 Bolt 14 Folding part 20 Lid top plate part 21 Cover part 22 Elastic member 25 Hole 26 Nut 30 Band 31 Sleeve

Claims (6)

A jig for installing a sensor on the surface of a cylindrical member,
A fixing member that is fixed to the surface of the cylindrical member, a lid member that is attached to the fixing member, and an elastic member that crimps the sensor to the surface of the cylindrical member,
The fixing member is formed with a pair of rail portions arranged in parallel with each other at a predetermined interval,
By disposing the elastic member on the lower surface of the lid member and attaching the lid member to the fixed member, the sensor is pressed against the surface of the cylindrical member by the elastic member, and the lower surface of the lid member is the cylindrical member A sensor installation jig on the surface of a cylindrical member, wherein the jig is set to be a predetermined distance from the surface of the cylindrical member. A jig for installing a sensor on the surface of a cylindrical member,
A fixing member fixed to the surface of the cylindrical member, a lid member attached to the fixing member, and an elastic member having a height higher than the fixing member in an uncompressed state,
The fixing member is formed with a pair of rail portions arranged in parallel with each other at a predetermined interval,
By disposing the elastic member on the lower surface of the lid member and attaching the lid member to the fixed member, the sensor is pressed against the surface of the cylindrical member by the elastic member, and the lower surface of the lid member is the cylindrical member A sensor installation jig on the surface of a cylindrical member, wherein the jig is set to be a predetermined distance from the surface of the cylindrical member.   The sensor installation jig according to claim 1, wherein the lid member is attached to the fixing member by a bolt and a nut.   The sensor installation jig according to claim 1, wherein the lid member is attached to the fixing member directly or via a sleeve.   The folded part which protrudes toward the outer side from a cylindrical member is formed in the both ends of the said fixing member used as the longitudinal direction of a cylindrical member when it installs in a cylindrical member, It is characterized by the above-mentioned. 4. The sensor installation jig according to any one of 4 above. The sensor has at least a first temperature sensor and a second temperature sensor;
A positioning means for positioning the lid member and the fixing member relative to each other when installed on a cylindrical member;
The first temperature sensor and the second temperature sensor are arranged on the inner surface of the elastic member so that the first temperature sensor and the second temperature sensor are arranged along the axial direction of the cylindrical member when installed on the cylindrical member. The sensor installation jig according to claim 1, wherein the sensor installation jig is mounted.

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