JP6754218B2 - Sensor device and its installation confirmation method - Google Patents

Description

The technology disclosed herein relates to a sensor device and a method for confirming its installation.

Conventionally, a sensor device that detects a physical quantity of a measurement object in contact with the measurement object has been known.

For example, the sensor device described in Patent Document 1 uses a pipe as a measurement object and detects vibration and temperature of the pipe as physical quantities. The sensor device is attached in contact with the pipe in order to detect vibration and temperature of the pipe.

Japanese Patent No. 5716138

By the way, as a configuration in which the sensor device is attached to the measurement object, a configuration in which the sensor body is attached so as to come into contact with the bottom of the bottomed hole of the measurement object can be considered. In such a configuration, since the sensor body and the measurement object come into contact with each other inside the bottomed hole, it is difficult to visually recognize the contact state between the sensor body and the measurement object from the outside.

The technique disclosed herein has been made in view of this point, and the purpose thereof is to make it possible to easily confirm the contact between the sensor body and the object to be measured.

The technique disclosed herein is intended for a sensor device that detects a physical quantity of an object to be measured. This sensor device has a contact portion that comes into contact with the object to be measured, and is connected to the sensor body and a sensor body that is installed so that the contact portion comes into contact with the bottom of a bottomed hole formed in the object to be measured. A fixed portion for fixing the sensor main body to the object to be measured and an insulating portion for insulating the sensor main body and the fixed portion are provided.

Further, the technique disclosed herein is intended for a mounting confirmation method for confirming mounting of a sensor device having a sensor body having a contact portion in contact with a measurement target on the measurement target. This mounting confirmation method includes a step of inserting the contact portion into the bottomed hole of the measurement object and fixing the sensor body to the measurement object by a fixing portion insulated from the sensor body, and the sensor body and the measurement target. The step of confirming the contact between the contact portion and the bottom of the bottomed hole by confirming the continuity with the object is included.

According to the sensor device disclosed here, the contact between the sensor body and the object to be measured can be easily confirmed.

Further, according to the mounting confirmation method disclosed here, the contact between the sensor body and the measurement object can be easily confirmed.

FIG. 1 is a front view showing a schematic configuration of a sensor device. FIG. 2 is a front view showing a schematic configuration of a mounting seat of an object to be measured. FIG. 3 is a vertical cross-sectional view of the sensor body. FIG. 4 is a vertical cross-sectional view of the sensor body installed in the installation hole.

Hereinafter, exemplary embodiments will be described in detail with reference to the drawings.

FIG. 1 is a front view showing a schematic configuration of the sensor device 100. The sensor device 100 is a so-called contact type sensor that detects a physical quantity of a measurement object in contact with the measurement object. For example, the object to be measured is a steam trap, and the physical quantity is the vibration and temperature of the steam trap.

FIG. 2 is a front view showing a schematic configuration of a mounting seat 91 of the measurement object 90. The sensor device 100 is attached to the mounting seat 91 of the measurement object 90. The mounting seat 91 is formed, for example, in the casing of a steam trap. The mounting seat 91 is formed in a boss shape and has a bottomed installation hole 92. A female screw 92b is formed on the inner peripheral surface of the installation hole 92. The sensor device 100 is screwed to the mounting seat 91 in a state of being partially inserted into the installation hole 92. The sensor device 100 contacts the bottom 92a of the installation hole 92 and detects the vibration and temperature of the bottom 92a. The installation hole 92 is an example of a bottomed hole, and the female screw 92b is an example of a threaded portion of an object to be measured.

As shown in FIG. 1, the sensor device 100 fixes the sensor body 2, the communication device 3, the connection pipe 4 connecting the sensor body 2 and the communication device 3, and the sensor body 2 to the measurement object 90. The fastening portion 50 is provided. The sensor body 2, the communication device 3, and the connecting tube 4 are arranged along a predetermined axis X, and the sensor device 100 is formed in a rod shape as a whole. The sensor body 2 and the connecting pipe 4 are connected by a union nut 5. The communication device 3 and the connecting pipe 4 are connected by a union nut 6. Although not shown, the communication device 3 has a built-in signal processing circuit and a transmitter. The communication device 3 transmits and receives signals to and from an external device, and for example, transmits the detection result of the sensor body 2 to the external device.

The sensor device 100 is usually installed so that the axis X faces in the vertical direction, the sensor body 2 is located below, and the communication device 3 is located above. Hereinafter, the communication device 3 will be described as the upper side, and the sensor main body 2 as the lower side.

<Sensor body configuration>
FIG. 3 is a vertical cross-sectional view of the sensor body 2. The sensor main body 2 includes a casing 10, a vibration detection mechanism 20 that detects (measures) the vibration of the measurement object 90, and a temperature detection mechanism 40 that detects (measures) the temperature of the measurement object 90. The vibration detection mechanism 20 and the temperature detection mechanism 40 are housed in the casing 10. The sensor body 2 is installed in the installation hole 92.

The casing 10 is formed in a substantially cylindrical shape, and is arranged so that the axis coincides with the axis X. A step 10f is provided inside the casing 10, and the inner diameter of the upper portion 10a of the casing 10 is larger than the inner diameter of the lower portion 10b. A male screw 10c into which the union nut 5 is screwed is formed on the outer peripheral surface of the upper portion 10a of the casing 10. The lower end 10g of the casing 10, which is one end in the axis X direction, comes into contact with the bottom 92a of the installation hole 92 when the sensor body 2 is installed in the installation hole 92. The lower end 10 g is an example of a contact portion.

The vibration detection mechanism 20 includes a detection needle 21, a holder 22, piezoelectric elements 25a and 25b, electrode plates 26a and 26b, a weight 27, a disc spring 28, and a cap 29.

The detection needle 21 is an elongated rod-shaped member. The detection needle 21 is arranged so that the axis axis coincides with the axis X. The tip (lower end) of the detection needle 21 projects downward from the lower end of the casing 10. When the sensor device 100 is attached to the object to be measured 90, the detection needle 21 comes into contact with the bottom 92a of the installation hole 92.

The holder 22 includes an inner metal holder 23 and an outer resin holder 24 that houses the metal holder 23. Both the metal holder 23 and the resin holder 24 are formed in a substantially cylindrical shape, and are arranged so that the axis coincides with the axis X.

While the metal holder 23 is open upward, a bottom wall 23a is provided below the metal holder 23. An insertion hole 23b is formed in the bottom wall 23a. The detection needle 21 is inserted into the insertion hole 23b, and the detection needle 21 projects downward from the metal holder 23. The upper end of the detection needle 21 is locked to the bottom wall 23a so that the detection needle 21 does not fall out of the metal holder 23.

In the metal holder 23, the first piezoelectric element 25a, the first electrode plate 26a, the second piezoelectric element 25b, the second electrode plate 26b, and the weight 27 are arranged in contact with each other in this order from the bottom. The first piezoelectric element 25a is in contact with the upper end of the detection needle 21.

Two signal lines (not shown) are connected to the two electrode plates 26a and 26b. The two signal lines are wired from the sensor main body 2 through the connecting pipe 4 to the inside of the communication device 3.

The disc spring 28 and the cap 29 are housed in the metal holder 23. The disc spring 28 is arranged on the weight 27. Two caps 29 are arranged on the disc spring 28. The cap 29 is a disk-shaped member having male threads formed on its outer peripheral surface. A female screw is formed on the inner peripheral surface of the upper end portion of the metal holder 23. The cap 29 is screwed onto the upper end of the metal holder 23. The cap 29 presses the disc spring 28 downward by its tightening force, and the disc spring 28 presses the piezoelectric elements 25a, 25b, etc. against the detection needle 21 via the weight 27 by its urging force.

In this way, the piezoelectric elements 25a and 25b are pressed against the detection needle 21 by the weight 27, the disc spring 28, and the like with a predetermined force (initial pressing force). As a result, even if vibrations or forces other than the object to be measured act on the piezoelectric elements 25a and 25b as disturbances, the disturbances can be absorbed and the influence of the disturbances can be reduced.

While the resin holder 24 is open upward, a bottom wall 24a is provided below the resin holder 24. An insertion hole 24b is formed in the bottom wall 24a. A metal 23 is press-fitted into the resin holder 24. The detection needle 21 is inserted into the insertion hole 24b, and the detection needle 21 projects downward from the resin holder 24.

The holder 22 is housed in the upper part 10a of the casing 10, and the detection needle 21 protruding downward from the holder 22 is housed in the lower part 10b of the casing 10.

A coil spring 11 is arranged above the holder 22 in the casing 10. The holder 22 is urged downward by the coil spring 11. A groove 10d is formed on the inner peripheral surface of the upper end portion of the casing 10, and a snap ring 12 is fitted in the groove 10d. One end of the coil spring 11 is supported by the snap ring 12. The other end of the coil spring 11 is in contact with the upper end surface of the resin holder 24. The coil spring 11 urges the resin holder 24 (holder 22) downward and presses the resin holder 24 against the step 10f in the casing 10. In this state, the tip of the detection needle 21 slightly protrudes from the lower end of the casing 10.

The temperature detection mechanism 40 includes a contact plate 41 (heat transfer plate) and a holding member 42. The contact plate 41 is a substantially annular plate member having an opening in the center. The holding member 42 is formed in a substantially cylindrical shape having a through hole 43 in the center, and is inserted into the lower end portion of the casing 10. The contact plate 41 is held at the tip of the holding member 42.

In addition to the through hole 43, the holding member 42 is formed with two arrangement holes 44, 45 for arranging thermocouples extending in the axial direction, respectively. A thermocouple (not shown) is arranged in each of the arrangement holes 44 and 45. One end of each thermocouple is connected to the contact plate 41, and the other end is connected to the communication device 3 through the connection pipe 4.

In the casing 10, the coil spring 13 is arranged above the holding member 42. One end of the coil spring 13 is held by the holder 22 (resin holder 24). The other end of the coil spring 13 is in contact with the holding member 42. The coil spring 13 urges the holding member 42 downward, whereby the contact plate 41 projects slightly downward from the lower end of the casing 10. That is, the contact plate 41 protrudes from the lower end of the casing 10, and the detection needle 21 further protrudes from the contact plate 41. When the sensor device 100 is attached to the object to be measured 90, the contact plate 41 comes into contact with the bottom 92a of the installation hole 92.

The fastening portion 50 is connected to the sensor main body 2, and the sensor main body 2 is screwed to the measurement object 90. The fastening portion 50 is formed in a substantially cylindrical shape, and the lower portion 10b of the casing 10 is inserted. The fastening portion 50 has a cylindrical cylinder body 51, a head 52 formed at the upper end of the cylinder body 51, and an insulating sleeve 53 provided on the inner peripheral surface of the cylinder body 51. The fastening portion 50 is an example of a fixing portion.

A male screw 51a screwed into the female screw 92b of the installation hole 92 is formed on the outer peripheral surface of the cylinder body 51. A locking portion 51b protruding inward is formed on the inner peripheral surface of the lower end portion of the cylinder body 51. The locking portion 51b is annular and is formed over the entire circumference of the inner peripheral surface. A locking nut 54 is screwed onto the outer circumference of the cylinder body 51. The male screw 51a is an example of the screw portion of the fixing portion.

The head 52 is formed in a substantially hexagonal shape in a plan view. That is, the head 52 has a shape in which an opening is formed in the center of the head of the hexagon bolt. The head 52 is a portion that is gripped by the tool when the fastening portion 50 is screwed.

The insulating sleeve 53 is made of an insulator such as resin and is formed in a substantially cylindrical shape. The insulating sleeve 53 is provided over substantially the entire length direction of the cylinder body 51 (excluding the locking portion 51b). The insulating sleeve 53 is attached to the inner peripheral surface of the cylinder body 51 by adhesion, press fitting, or the like. The lower portion 10b of the casing 10 is inserted into the insulating sleeve 53. The inner diameter of the insulating sleeve 53 is larger than the outer diameter of the lower portion 10b. That is, a gap is formed between the insulating sleeve 53 and the lower portion 10b.

The fastening portion 50 is rotatable about the axis X with respect to the casing 10 and is restricted from moving downward in the axis X direction (that is, the lower end side of the casing 10) by the snap ring 14 provided at the lower end portion of the lower portion 10b. It is connected to the casing 10 in this state. An annular groove 10e extending in the circumferential direction is formed at the lower end of the lower portion 10b, and the snap ring 14 is fitted in the groove 10e. The outer diameter of the snap ring 14 is larger than the inner diameter of the locking portion 51b. That is, the fastening portion 50 cannot move downward in the axial X direction with respect to the lower portion 10b because the locking portion 51b is locked to the snap ring 14. The snap ring 14 is attached to the groove 10e after the lower portion 10b is inserted into the fastening portion 50. The snap ring 14 is made of an insulator such as resin.

That is, the insulating sleeve 53 and the snap ring 14 are examples of the insulating portions that insulate the sensor main body 10 and the fastening portion 50. The insulating sleeve 53 is an example of the first insulating portion, and the snap ring 14 is an example of the second insulating portion.

<Installation of sensor device>
The sensor main body 2 configured in this way is installed so that the detection needle 21 and the contact plate 41 come into contact with the bottom 92a of the installation hole 92. FIG. 4 is a vertical cross-sectional view of the sensor main body 2 installed in the installation hole 92. Specifically, the sensor body 2 is screwed to the object to be measured 90 by screwing the fastening portion 50 into the installation hole 92. By screwing the fastening portion 50 into the installation hole 92, the fastening portion 50 enters the installation hole 92. At this time, since the casing 10 is connected to the fastening portion 50 by the snap ring 14, the casing 10 enters the installation hole 92 together with the fastening portion 50. However, since the fastening portion 50 is rotatable with respect to the casing 10, the casing 10 translates in the direction of the axis X without rotating around the axis X.

As the casing 10 enters the installation hole 92, the tip of the detection needle 21 first comes into contact with the bottom 92a of the installation hole 92. Although the vibration detection mechanism 20 is urged downward by the coil spring 11, it can move upward against the urging force of the coil spring 11. Therefore, as the casing 10 enters the installation hole 92, the detection needle 21 moves upward with respect to the casing 10, and the amount of protrusion of the detection needle 21 from the casing 10 decreases.

When the casing 10 further enters the installation hole 92, the contact plate 41 also comes into contact with the bottom 92a of the installation hole 92. Although the temperature detection mechanism 40 is urged downward by the coil spring 13, it can move upward against the urging force of the coil spring 40. Therefore, as the casing 10 enters the installation hole 92, the contact plate 41 moves upward with respect to the casing 10, and the amount of protrusion of the contact plate 41 from the casing 10 decreases.

When the casing 10 further enters the installation hole 92, the lower end 10 g of the casing 10 finally comes into contact with the bottom 92a of the installation hole 92. At this time, the tip of the detection needle 21 and the contact plate 41 are flush with the lower end 10 g of the casing 10 and are in contact with the bottom 92a of the installation hole 92. That is, the sensor main body 2 is configured so that the tip of the detection needle 21 and the contact plate 41 also come into contact with the bottom 92a whenever the lower end 10 g of the casing 10 comes into contact with the bottom 92a. After that, by tightening the lock nut 54, the attachment of the sensor body 2 is completed.

In this way, when the sensor body 2 is attached to the measurement object 90, the detection needle 21 and the contact plate 41 are in contact with the bottom 92a of the installation hole 92, and the vibration and temperature of the measurement object 90 are detected, respectively. .. The detection result of the vibration and the temperature of the measurement object 90 is wirelessly transmitted from the communication device 3 to the external device.

<Confirmation of sensor device installation>
As described above, the detection needle 21 and the contact plate 41 need to be in contact with the measurement object 90. However, since the place where the detection needle 21 and the contact plate 41 come into contact is the bottom 92a of the installation hole 92, it is necessary to visually recognize from the outside whether or not the detection needle 21 and the contact plate 41 are in contact with the bottom 92a of the installation hole 92. Can't.

Therefore, in the sensor device 100, the contact between the detection needle 21 and the contact plate 41 and the measurement object 90 is confirmed by confirming the continuity between the casing 10 and the measurement object 90.

That is, in the method of confirming the attachment of the sensor device 100, the lower end 10 g of the casing 10 is inserted into the installation hole 92 of the measurement object 90, and the sensor body 2 is fixed to the measurement object 90 by the fastening portion 50 insulated from the sensor body 2. This includes a step of confirming the contact between the lower end 10 g of the casing 10 and the bottom 92a of the installation hole 92 by confirming the continuity between the sensor body 2 and the object to be measured 90.

As described above, the snap ring 14 that connects the fastening portion 50 and the casing 10 is made of an insulator, and the insulating sleeve 53 is provided between the cylinder body 51 and the casing 10, so that the snap ring 14 is provided. There is no continuity between the fastening portion 50 and the casing 10 via the casing, and there is no continuity due to contact between the inner peripheral surface of the cylinder body 51 and the outer peripheral surface of the casing 10. Therefore, even if the casing 10 is fixed to the measurement object 90 by the fastening portion 50, the casing 10 and the measurement object 90 do not conduct with each other through the fastening portion 50. On the other hand, the casing 10 is installed so that the lower end 10 g is in contact with the bottom 92a of the installation hole 92. That is, the casing 10 conducts with the measurement object 90 only when the lower end 10 g comes into contact with the bottom 92a of the installation hole 92.

Therefore, when the continuity between the casing 10 and the object to be measured 90 is confirmed by a measuring device such as a tester, if both are conducting, the lower end 10 g of the casing 10 is in contact with the bottom 92a of the installation hole 92. become. On the other hand, if the casing 10 and the object to be measured 90 are not conductive, the lower end 10 g of the casing 10 is not in contact with the bottom 92a of the installation hole 92.

In this way, even if the contact between the lower end 10 g of the casing 10 and the bottom 92a of the installation hole 92 cannot be visually recognized, the lower end 10 g is confirmed by confirming the continuity between the sensor body 2 (specifically, the casing 10) and the measurement object 90. The contact between the bottom 92a and the bottom 92a can be easily confirmed.

As described above, the sensor device 100 has a lower end 10 g (contact portion) of the casing 10 that comes into contact with the measurement object 90, and is formed on the bottom 92a of the installation hole 92 (bottomed hole) formed in the measurement object 90. The sensor main body 2 installed so that the lower end 10 g is in contact with the sensor main body 2, the fastening portion 50 (fixing portion) connected to the sensor main body 2 and fixing the sensor main body 2 to the measurement object 90, and the sensor main body 2 and the fastening portion 50 It is provided with a snap ring 14 and an insulating sleeve 53 (insulating portion) for insulating the above.

According to this configuration, the sensor main body 2 is installed on the measurement object 90 so that the lower end 10 g of the casing 10 comes into contact with the bottom 92a of the installation hole 92, and is fixed to the measurement object 90 by the fastening portion 50. Since the lower end 10g of the casing 10 is located in the installation hole 92, it cannot be visually recognized from the outside whether or not the lower end 10g is in contact with the bottom 92a of the installation hole 92. Here, since the sensor main body 2 and the fastening portion 50 are insulated by the snap ring 14 and the insulating sleeve 53, the sensor main body 2 and the measurement object 90 are the lower end 10 g of the casing 10 and the bottom 92 a of the installation hole 92. It will be conductive only by the contact of. That is, by confirming the continuity between the measurement object 90 and the sensor body 2, it is possible to easily confirm the contact between the lower end 10 g and the bottom 92a, that is, that the sensor device 100 is properly attached.

Further, the lower end 10 g of the casing 10 is provided at one end of the sensor body 2 in the axis X direction, and the fastening portion 50 is rotatable around the axis X and is on the lower end 10 g side in the axis X direction with respect to the sensor body 2. The sensor body 2 is screwed to the measurement object 90 after being connected in a state where the movement to the sensor body 2 is restricted.

According to this configuration, the fastening portion 50 screw-fastens the sensor body 2 to the measurement object 90. The fastening portion 50 is screwed in the axis X direction by being rotated around the axis X. At this time, the fastening portion 50 is connected to the sensor main body 2 in a state of being rotatable around the axis X and restricted from moving toward the lower end 10 g in the axis X direction. Therefore, even if the fastening portion 50 is rotated, the sensor main body 2 does not rotate and moves in the axis X direction together with the fastening portion 50 and enters the installation hole 92.

Further, the fastening portion 50 has a male screw 51a screwed into the female screw 92b formed on the measurement object 90, and is formed in a tubular shape into which the sensor body 2 is inserted, and the insulating portion is the fastening portion 50. The insulating sleeve 53 (first insulating portion) provided between the inner peripheral surface and the sensor main body 2 and the sensor main body 2 and the fastening portion 50 are rotatable around the axis X and toward the lower end 10 g side in the axis X direction. It has a snap ring 14 (second insulating portion) that connects in a state where movement is restricted.

According to this configuration, the snap ring 14 for relatively rotatably connecting the sensor main body 2 and the fastening portion 50 is formed of an insulator, and between the inner peripheral surface of the fastening portion 50 and the sensor main body 2. Since the insulating sleeve 53 made of an insulator is provided, the sensor body 2 rotatably connected and the fastening portion 50 can be insulated.

<< Other Embodiments >>
As described above, the above-described embodiment has been described as an example of the technology disclosed in the present application. However, the technique in the present disclosure is not limited to this, and can be applied to embodiments in which changes, replacements, additions, omissions, etc. are made as appropriate. It is also possible to combine the components described in the above-described embodiment into a new embodiment. In addition, among the components described in the attached drawings and the detailed description, not only the components essential for solving the problem but also the components not essential for solving the problem in order to illustrate the above-mentioned technology. Can also be included. Therefore, the fact that these non-essential components are described in the accompanying drawings or detailed description should not immediately determine that those non-essential components are essential.

The embodiment may have the following configuration.

For example, the object to be measured 90 is not limited to the steam trap.

The sensor device 100 detects temperature and vibration, but the physical quantity to be detected is not limited to these. For example, the sensor device 100 may detect only the temperature or only the vibration. Further, the sensor device 100 does not have to include the communication device 3, the connection tube 4, and the like.

Although the fastening portion 50 screw-fastens the sensor body 2 to the measurement object 90, it may be fixed to the sensor body 2 and the measurement object 90 by a method other than screw fastening. Further, although the fastening portion 50 is rotatably connected to the sensor main body 2, the fastening portion 50 and the sensor main body 2 may be rotatably connected to each other.

The fastening portion 50 has a male screw 51a, and a female screw 92b is formed in the installation hole 92, but the fastening portion 50 is not limited thereto. The fastening portion 50 may have a female screw, and the mounting seat 91 may have a male screw. That is, a female screw may be formed on the outer peripheral surface of the boss-shaped mounting seat 91. The fastening portion 50 is composed of a so-called union nut. In that case, the snap ring 14 of the casing 10 is provided at a position above the embodiment, and the fastening portion 50 is also attached at a position relatively above the lower portion 10b of the casing 10. Even in such a configuration, the lower end 10 g of the casing 10 is inserted into the installation hole 92, and the fastening portion 50 is screwed to the mounting seat 91.

Further, the insulation between the inner peripheral surface of the fastening portion 50 and the sensor main body 2 does not have to be due to the insulating sleeve 53. For example, the inner peripheral surface of the fastening portion 50 or the outer peripheral surface of the sensor body 2 (specifically, the lower portion 10b) may be covered with an insulating film with an insulating paint or the like.

Further, the insulation between the fastening portion 50 and the sensor main body 2 and the connection between the fastening portion 50 and the sensor main body 2 in a state where the fastening portion 50 can rotate around the axis X and the movement toward the lower end 10 g in the axis X direction is restricted. , It does not have to be due to the snap ring 14. For example, a collar-shaped locking portion made of an insulator may be provided on the outer periphery of the lower portion 10b of the casing 10. In the above embodiment, since the outer diameter of the upper portion 10a of the casing 10 is larger than the inner diameter of the fastening portion 50, it is necessary to insert the lower portion 10b of the casing 10 into the fastening portion 50 from above the fastening portion 50. Therefore, a snap ring 14 that can be attached after inserting the casing 10 into the fastening portion 50 is adopted. However, when the maximum outer diameter of the casing 10 is smaller than the inner diameter of the fastening portion 50, or when the upper portion 10a and the lower portion 10b of the casing 10 can be attached and detached, the casing 10 is fastened from below the fastening portion 50. In the case of a configuration that can be inserted into the casing 10, the fastening portion 50 and the sensor main body 2 may be connected by a locking portion fixedly provided on the casing 10.

Further, the sensor device 100 is configured such that the detection needle 21 and the contact plate 41 always come into contact with the bottom 92a when the lower end 10 g of the casing 10 is in contact with the bottom 92a of the installation hole 92, and the lower end 10 g of the casing 10 is formed. The contact with the bottom 92a is confirmed by confirming the continuity. However, when the portion conducting with the detection needle 21 or the contact plate 41 is exposed on the outer surface of the sensor body 2, the continuity between the exposed portion and the measurement object 90 is confirmed. , The contact between the detection needle 21 or the contact plate 41 and the bottom 92a may be confirmed. In that case, contact between the lower end 10g and the bottom 92a is not essential.

As described above, the techniques disclosed herein are useful for the sensor device and its mounting confirmation method.

100 Sensor device 10 Casing 10g Lower end (contact part)
14 Snap ring (insulation part, second insulation part)
2 Sensor body 21 Detection needle 41 Contact plate 50 Fastening part (fixing part)
51a Male screw (screw part)
53 Insulation sleeve (insulation part, first insulation part)
90 Object to be measured 92 Installation hole (bottomed hole)
92a Bottom 92b Female screw (screw part)
X axis

Claims (4)

A sensor device that detects the physical quantity of a measurement object made of a conductive material .
A sensor body that is provided with a contact portion that comes into contact with the object to be measured, has a casing made of a conductive material, and is installed so that the contact portion comes into contact with the bottom of a bottomed hole formed in the object to be measured. When,
A fixing portion that is connected to the casing and fixes the sensor body to the measurement object,
A sensor device including an insulating portion that insulates the casing and the fixed portion. In the sensor device according to claim 1,
The contact portion is provided at one end of the casing in a predetermined axial direction.
The fixing portion is connected to the casing in a state of being rotatable around the axis and restricted from moving toward the contact portion in the axial direction, and the sensor body is screwed to the object to be measured. A sensor device characterized by. In the sensor device according to claim 2,
The fixing portion has a screw portion to be screwed into a screw portion formed on the object to be measured, and is formed in a tubular shape into which the casing is inserted.
The insulating portion includes a first insulating portion provided between the inner peripheral surface of the fixing portion and the casing, and a contact portion in which the casing and the fixing portion are rotatable around the axis and in the axial direction. A sensor device characterized by having a second insulating portion that is connected in a state where movement to the side is restricted. A mounting confirmation method that confirms the mounting of a sensor device equipped with a sensor body having a casing made of a conductive material and having a contact portion that comes into contact with the measuring object made of a conductive material. There,
A step of inserting the contact portion into the bottomed hole of the object to be measured and fixing the sensor body to the object to be measured by a fixing portion insulated from the casing .
A mounting confirmation method comprising a step of confirming contact between the contact portion and the bottom of a bottomed hole by confirming continuity between the casing and the object to be measured.

Images