JP6774770B2 - Temperature measuring device for rotating body, temperature measuring method for rotating body, turbine and rotating body - Google Patents

Description

The present invention relates to a temperature measuring device for a rotating body, a rotating body provided with the temperature measuring device, a turbine, and a method for measuring the temperature of the rotating body using the temperature measuring device.

It may be necessary to measure the temperature state of a rotating body such as a rotor of a rotating device. For example, since the rotor of a steam turbine is exposed to a high temperature, what kind of temperature state the rotor is in during operation is important information in rotor development such as selection of rotor material. Therefore, it is required to measure the temperature of the rotor. In this case, temperature information not only on the outer surface of the rotor but also on the inside of the rotor may be required.

In order to measure the temperature reliably, it is effective to use a contact type temperature sensor. Therefore, if the detection unit of the temperature sensor is brought into contact with the inside of a rotating body such as a rotor, that is, the inner surface of a hole (shaft hole) formed through the central portion of the rotating body, the temperature inside the rotating body can be reliably measured. can do. However, it is necessary to arrange the temperature sensor at a predetermined axial position of the shaft hole of the rotating body and keep the detection unit of the temperature sensor in contact with the inner surface of the hole.

In this regard, Patent Document 1 discloses an apparatus for measuring the circular wall temperature of a non-rotating tube or a hole (a hole of a non-rotating body). This device axially penetrates a tubular support cylinder, a piston slidably mounted in a hole that penetrates the support cylinder in the radial direction, a temperature sensor attached to the outer end face of the piston, and the support cylinder. It has an operating shaft and a spring that presses the piston by operating the operating shaft. By inserting the support cylinder into the hole of the non-rotating body and operating the operating shaft, the spring presses the piston and detects the temperature sensor. The part is crimped to the inner surface of the hole.

Jikken Sho 58-36990

However, as in the device of Patent Document 1, when the operation shaft is operated so that the spring presses the piston and crimps the detection portion of the temperature sensor to the inner surface of the hole, the detection portion of the temperature sensor is formed into a hole. Although it can be crimped to the inner surface of the temperature sensor, a mechanism including a piston and a spring is required to allow the temperature sensor detection portion to appear and disappear from the outer periphery of the support cylinder, which complicates the structure.

Further, the smaller the inner diameter of the hole, the smaller the diameter of the operating shaft needs to be, which makes it difficult to secure the rigidity of the operating shaft. Furthermore, when the temperature sensor is inserted deep into the hole, the distance between the operation input point of the operation shaft and the infestation operation point of the temperature sensor becomes longer when operating the temperature sensor, so that the rigidity of the operation shaft is further ensured. It will be difficult.

Further, if there is a step such as a welding step on the inner peripheral surface of the hole into which the sensor support member for inserting the temperature sensor (for example, the tubular support cylinder) is inserted, the sensor support member is to be inserted into the hole. , The outer circumference of the sensor support member is caught in the step, and it becomes difficult to reach the sensor at a predetermined position inside the hole.

If the outer circumference of the sensor holding member is made smaller and the clearance between the outer circumference of the sensor holding member and the inner peripheral surface of the hole is increased, the outer circumference of the sensor holding member can be made less likely to be caught in the step. For example, Patent Document 1 In the case of an apparatus, the outer diameter of the operating shaft is further regulated, which makes it even more difficult to secure the rigidity of the operating shaft.

Further, the device of Patent Document 1 measures the temperature by inserting a temperature sensor into the hole of the non-rotating body, but when the temperature sensor is inserted into the shaft hole of the rotating body to measure the temperature, the temperature sensor is used. And the mechanism that crimps the detection part of the temperature sensor to the inner surface of the hole is affected by rotation, and the desired pressure contact state may not be obtained.

The present invention has been devised in view of such a problem, and the temperature sensor is surely inserted and installed at a predetermined position in the shaft hole of a rotating body such as a rotor of a turbine, and the detection unit of the temperature sensor is mounted on the inner surface of the shaft hole. An object of the present invention is to provide a temperature measuring device for a rotating body, a rotating body, a turbine, and a method for measuring the temperature of the rotating body, which can measure the internal temperature of the rotating body at the time of rotation by surely pressing the rotating body. There is.

(1) In order to achieve the above object, the temperature measuring device for a rotating body of the present invention is a temperature measuring device for measuring the temperature of the inner surface of a shaft hole along the center of rotation of the rotating body, and is inside the shaft hole. A tubular member inserted into the tubular member, a flange portion installed on the tubular member, and wiring from the inside of the tubular member to the outer peripheral portion of the flange portion, and the outer periphery of the flange portion at the tip of the wiring. A temperature sensor having a detection portion that protrudes in the circumferential direction from the portion and comes into contact with the inner surface is provided, and the maximum outer diameter of the flange portion is set to be smaller than the inner diameter of the shaft hole and is inserted into the shaft hole. The device center of gravity in the installed state is eccentric to the side where the detection unit is arranged with respect to the rotation center of the rotating body.
A thermocouple can be applied to the temperature sensor, for example.
Further, it is preferable that the maximum outer diameter of the flange portion is set smaller than the inner diameter of the shaft hole by an insertion clearance or more. The insertion clearance in this case is set according to the state of the inner surface of the shaft hole so that the flange portion can enter the shaft hole without any trouble.

(2) It is preferable that the center of gravity of the flange portion in the state of being inserted and installed in the shaft hole is eccentric to the side where the detection portion is arranged with respect to the rotation center of the rotating body.

(3) It is preferable that a notch portion that brings the center of gravity of the flange portion into the eccentric state is formed on the outer peripheral portion of the flange portion.

(4) A first protruding portion whose outer circumference protrudes outward in the radial direction is formed in the first half portion of the flange portion on the side where the detection portion is arranged with respect to the axial center of the tubular member. A second protruding portion whose outer circumference protrudes outward in the radial direction is formed in the second half portion opposite to the first half portion, and the outer peripheral portion between the first protruding portion and the second protruding portion is formed. It is preferable that the cutout portion is formed in the above portion, and the first protruding portion is formed to have a larger size in the circumferential direction than the second protruding portion.

(5) It is preferable that the center of gravity of the device is arranged on a plane including the axis of the tubular member and the detection point of the detection unit.

(6) It is preferable that the outer periphery of the flange portion is formed in a smooth curved surface shape.

(7) It is preferable that the flange portion is machined with a wiring hole for wiring the temperature sensor, and a heat insulating material is interposed between the temperature sensor and the wiring hole.

(8) It is preferable that the detection unit is formed in a linear shape capable of linear contact with the inner surface.

(9) It is preferable that a guide mechanism for guiding the circumferential position of the flange portion with respect to the shaft hole of the rotor is provided between the outer peripheral portion of the flange portion and the shaft hole of the rotor.

(10) A plurality of detection target locations that require temperature detection on the inner surface are distributed in the axial direction of the rotating body, and a plurality of the flange portions are arranged on the tubular member at positions corresponding to the detection target locations. Is preferably fixed.

(11) It is preferable that the positions of the centers of gravity of the plurality of flange portions are eccentric in the same direction with respect to the axial centers of the tubular members.

(12) It is preferable that the tubular member is joined to the rotating body at one end.

(13) The rotating body of the present invention is a rotating body having a shaft hole, and is characterized in that the temperature measuring device for the rotating body according to any one of (1) to (12) is attached. There is.

(14) The turbine of the present invention is characterized by including the rotating body according to (13) as a rotor.

(15) In the method for measuring the temperature of a rotating body of the present invention, the temperature of the inner surface of the shaft hole of the rotating body is measured by using the temperature measuring device for the rotating body according to any one of (1) to (12). A method for measuring the temperature of a rotating body to be measured, in which the tubular member is inserted into the shaft hole, and the detection unit of the temperature sensor is arranged so as to face a detection target portion of the inner surface that requires temperature detection. In the preparatory step of installing the tubular member on the rotating body, the rotating body is rotated to rotate the tubular member integrally with the rotating body, and the side eccentric to the flange portion with this rotation. It is characterized by having a measuring step of measuring the temperature of the inner surface by bringing the detection unit into contact with the inner surface by the centrifugal force generated toward the inner surface.

According to the present invention, a tubular member is inserted into the shaft hole of the rotating body, and the detection unit of the temperature sensor mounted on the flange portion is arranged at a required position in the shaft hole. At this time, since the maximum outer diameter of the flange portion is set to be smaller than the inner diameter of the shaft hole, the tubular member can be inserted into the shaft hole without any trouble.

Then, while rotating the rotating body, the temperature of the inner surface of the shaft hole of the rotating body is detected by the temperature sensor. When the rotating body is rotated, the tubular member also rotates integrally with the rotating body, and along with this rotation, centrifugal force is generated in the tubular member in the eccentric direction, and the flange portion is displaced in the eccentric direction. .. Since the detection unit is arranged on the side in the eccentric direction, the detection unit presses against the inner surface of the shaft hole of the rotating body as the flange portion is displaced, and the temperature of the inner surface of the shaft hole can be reliably measured. it can.

It is a figure which shows the temperature measuring apparatus of the rotating body which concerns on 1st Embodiment of this invention, (a) is the front view of the flange part, (b) is the sectional view of the flange part [A of FIG. 1 (a). -A cross-sectional view taken along the arrow]. It is a vertical sectional view which shows the rotating body which concerns on each embodiment of this invention. It is a vertical sectional view of the main part of the rotating body which shows the attached state to the rotating body of the temperature measuring apparatus of the rotating body which concerns on each embodiment of this invention. It is a front view of the flange part which shows the temperature measuring apparatus of the rotating body which concerns on 2nd Embodiment of this invention. It is sectional drawing of the main part of the flange part which shows the temperature measuring apparatus of the rotating body which concerns on 3rd Embodiment of this invention. It is a front view of the flange part which shows the temperature measuring apparatus of the rotating body which concerns on 4th Embodiment of this invention. It is a front view of the main part of the flange part which shows the temperature measuring apparatus of the rotating body which concerns on the modification of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
It should be noted that each of the embodiments shown below is merely an example, and there is no intention of excluding the application of various modifications and techniques not specified in the following embodiments. Each configuration of the following embodiments can be variously modified and implemented without departing from the purpose thereof, and can be selected as necessary or combined as appropriate.

〔Rotating body〕
First, a rotating body to which the temperature measuring device (also referred to as a temperature measuring jig) of the rotating body according to each embodiment is applied will be described.
The rotating body according to the present embodiment is a rotor of a rotating device (for example, a steam turbine), and as shown in FIG. 2, the rotor 1 has a hollow shaft hole 1a along the center of rotation of the rotor and has a shaft. The roller portions 2, 3 and 4 divided in a plurality of directions (here, three) are connected at the joining points 5 and 6, respectively. The roller portions 2, 3 and 4 may be made of the same material or different materials.

Further, the joining points 5 and 6 are joined by welding. Since this welding coupling is performed from the outer peripheral side of the roller portions 2, 3 and 4, the welding coupling portions 5a, 5b, 6a and 6b at the ends of the roller portions 2, 3 and 4 are welded and coupled from the outer peripheral side. In addition, the inner peripheral side is hollow and notched so that only the outer peripheral side is in contact with the welded portion. Therefore, the inner surface 1f of the shaft hole 1a of the rotor 1 formed by welding the roller portions 2, 3 and 4 has a step due to the notch on the inner peripheral side of the welded joint portions 5a, 5b, 6a and 6b. (Welding steps due to welding) 7a, 7b, 7c, 7d are formed.

In the present embodiment, the shaft hole 1a of the rotor 1 is a one-sided opening hole in which only the right side is opened in FIG. 2, and the inner diameter D of the shaft hole 1a is extremely small, and the shaft hole 1a is larger than the inner diameter D. The depth length L is formed extremely long. This temperature measuring device measures the temperature inside the rotor 1 by directly contacting the detection unit of the temperature sensor with the inner surface 1f of the shaft hole 1a of the rotor 1.

1st Embodiment [Configuration of temperature measuring device]
As shown in FIG. 3, the temperature measuring device 10 includes a pipe (cylindrical member) 20 inserted into the shaft hole 1a and installed at a predetermined position, a flange portion 30 fixed to the pipe 20, and a flange portion 30. A thermocouple (temperature sensor) 40 which is wired from the inside 21 of the pipe 20 to the outer peripheral portion 31 of the flange portion 30 and has a detecting portion 41 protruding outward from the outer peripheral portion 31 of the flange portion 30 at the tip of the wiring. A joining flange portion 50 for joining the temperature measuring device 10 to the rotor 1 is provided. In FIG. 3, the cross-sectional hatching of the tubular member 20, the flange portions 30, 50 is omitted.

In the present embodiment, the pipe 20 has pipe members (cylindrical members) 22A to 22E (hereinafter, when individual tubular bodies are not distinguished, indicated by reference numeral 22) divided into a plurality of pipes in the axial direction via the flange portion 30. It is composed by being combined.

FIG. 1B is an enlarged cross-sectional view showing a portion where the pipe member 22 is connected via the flange portion 30 (for example, the arrow AA of FIG. 1A regarding the flange portion 30 of the portion B of FIG. 3). Sectional view). As shown in FIG. 1B, the flange portion 30 is composed of two flange members 32 and 33 polymerized in the thickness direction. The flange members 32 and 33 are fixed to the end of the pipe member 22 by, for example, welding. By polymerizing the flange members 32 and 33 and fastening them with bolts 61, a flange portion 30 to which the flange members 32 and 33 are bonded is formed, and the two pipe members 22 are coupled in series.

In this way, a plurality of flange portions 30 are arranged at required locations in the longitudinal direction, and a thin and long pipe 20 corresponding to the shaft hole 1a having an extremely small inner diameter D and an extremely long depth length L is formed. At the tip end of the tubular body 22A at the tip, only the flange member 33 is fixed, and the pipe member 22 is not fixed to the flange member 32 on the tip side. Further, the joint flange portion 50 is fixed to the base end side end portion of the base end pipe material 22E.

The thermocouple 40 is wired to the inside 21 of the pipe 20 configured in this way, and is further wired from the inside 21 of the pipe 20 to the outer peripheral portion 31 of the flange portion 30, and the detection portion 41 at the tip is the outer peripheral portion of the flange portion 30. It protrudes outward from 31. In this way, in order to wire from the inside 21 of the tubular member 20 to the outer peripheral portion 31 of the flange portion 30, a wiring groove 34 is formed on one or both overlapping surfaces of the flange members 32 and 33 that overlap each other. There is.

In this way, the thermocouple 40 is wired to each flange portion 30. In particular, each of the flange portions 30 is arranged so that the detection portion 41 of the thermocouple 40 is located in the same direction as the outer peripheral portion 31 of the flange portion 30.

Here, the configuration of the flange portion 30 characteristic of the temperature measuring device 10 will be described.
FIG. 1A is a front view of the flange portion 30 of the temperature measuring device 10. As shown in FIG. 1A, the outer peripheral portion 31 is formed with cutout portions 35a, 35b, 35c notched with respect to the reference circle 31c indicated by the alternate long and short dash line. The center O ₁ of the reference circle 31c of the flange portion 30 coincides with the axis of the pipe 20 to which the flange portion 30 is connected (which is also the axis of the temperature measuring device 10).

The cutout portions 35a, 35b, 35c are mainly formed on the side of the flange portion 30 opposite to the side on which the detection portion 41 of the thermocouple 40 is arranged. In the present embodiment, the first protrusion 36a is between the notches 35a and 35c, the second protrusion 36b is between the notches 35a and 35b, and the second protrusion is between the notches 35b and 35c. Each of the portions 36c is formed. The tip portions of the protruding portions 36a, 36b, and 36c are located in a reference circle.

Of these, the first protruding portion 36a is arranged on the flange portion 30 on the side where the thermocouple 40 detection portion 41 is arranged, and the second protruding portions 36b and 36c are arranged on the flange portion 30 on the side where the thermocouple 40 detection portion 41 is arranged. Is placed on the side opposite to the side on which is placed. Further, the circumferential length W1 of the first protruding portion 36a is set sufficiently larger than the sum of the circumferential lengths W2 and W3 of the second protruding portions 36b and 36c [W1 >> (W2 + W3)].

The side on which the detection unit 41 is arranged is a semicircular portion (half portion) of the reference circle 31c centered on the arrangement of the detection unit 41. That is, [indicated by a dashed line in FIGS. 1 (a)] reference line is a diameter line orthogonal to the straight line connecting the detection point 41p of the center O ₁ and the detector 41 of the reference circle 31c relative to the BL, detector 41 That is, in FIG. 1A, the half portion (first half portion) P1 on the right side of the reference line BL is the side on which the detection unit 41 is arranged. Further, the side opposite to the side on which the detection unit 41 of the thermocouple 40 is arranged is the half portion (second half portion) P2 on the left side of the reference line BL in FIG. 1 (a).

Such shape setting, the center of gravity G ₁ of the flange portion 30, with respect to the center O ₁ of the reference circle 31c, is disposed eccentrically on the side of the detector 41 is disposed (the first half) P1 position There is. Here, the center of gravity G ₁ of the flange portion 30 is positioned on the straight line connecting the detection point 41p of the center O ₁ and the detector 41 of the reference circle 31c, is the most preferred eccentrically, the center of gravity G ₁ is , it may deviate from a straight line connecting the center O ₁ and the detection point 41p.

As a result, the center of gravity (device center of gravity) G ₂ on the cross section of the temperature measuring device 10 including the pipe 20 and the flange portion 30 is also arranged with the detection unit 41 with respect to the axial center O ₁ of the temperature measuring device 10. It is arranged at a position eccentric to P1 on the side (first half). Further, the center of gravity G _{2 is} also on a straight line connecting the center O ₁ of the reference circle 31c and the detection point 41p of the detection unit 41, that is, a plane including the axis O ₁ of the pipe 20 and the detection point 41p of the detection unit 41. It is placed on top.

Further, the maximum outer diameter of the flange portion 30 (that is, the diameter d of the reference circle 31c) is set to be smaller than the inner diameter D of the shaft hole 1a of the rotor 1. This setting allows the outer peripheral portion 31 of the flange portion 30 to enter the rotor 1 without being caught in the inner surface 1f of the shaft hole 1a when the temperature measuring device 10 is inserted into the shaft hole 1a of the rotor 1. This is to ensure clearance. This insertion clearance is set according to the state of the inner surface 1f of the shaft hole 1a so that the flange portion 30 can enter the shaft hole 1a without any trouble.

In particular, the rotor 1 according to the present embodiment is formed by welding the roller portions 2, 3 and 4, and steps 7a, 7b, 7c and 7d are formed on the inner surface 1f of the shaft hole 1a of the rotor 1. Has been done. Therefore, the insertion clearance of the present embodiment is set large so that the flange portion 30 can enter the shaft hole 1a without any trouble even at the steps 7a, 7b, 7c, and 7d.
Further, the outer peripheral portion 31 of the flange portion 30 is formed in a smooth curved surface shape, whereby the flange portion 30 can smoothly enter the shaft hole 1a.

As shown in FIG. 3, the temperature measuring device 10 configured in this way joins the joining flange portion 50 at the base end side end portion of the pipe 20 to the periphery of the opening 1b of the shaft hole 1a of the rotor 1. .. Here, the flange portion 50 is fastened and fixed by bolts 62, but the joining mode of the rotor 1 of the temperature measuring device 10 to the shaft hole 1a is not limited to this, and at least the temperature measuring device 10 is used. The temperature measuring device 10 is joined to the shaft hole 1a of the rotor 1 in consideration of slip prevention and rotation prevention so that the deviation in the axial direction and the deviation in the rotation direction can be regulated with respect to the shaft hole 1a of the rotor 1. do it. The temperature measuring device 10, as shown in FIG. 1 (a), the axis (a center of the reference circle 31c of the flange portion 30, is also the axis of the pipe 20) the O ₁ rotation of the rotor 1 center O It is joined to the rotor 1 with or substantially the same as ₀ . Further, the thermocouple 40 is taken out of the rotor 1 from the opening 1b of the shaft hole 1a, and the detection information is taken into the fixed side by using, for example, a slip ring or a telemeter.

However, the temperature measuring device 10, under the influence of the insertion clearance, but the axis O ₁ of the temperature measuring device 10 can deviated from the rotation center O ₀ of the rotor 1, such axis O ₁ even considering the deviation of the rotational center O ₀ of the rotor 1, the center of gravity G ₂ of the temperature measuring device 10 is the rotation center O ₀ of the rotor 1, the side where the detection unit 41 is disposed (the first half) P1 The amount of eccentricity is set so that the position is eccentric to.

[Action and effect]
Since the temperature measuring device 10 for the rotating body according to the present embodiment is configured as described above, the internal temperature of the rotor 1 during the rotational operation of the rotor 1 can be measured as shown below.

That is, the pipe 20 is inserted into the shaft hole 1a of the rotor 1, and the detection unit 41 of the thermocouple 40 mounted on each flange portion 30 is arranged at a required position in the shaft hole 1a (preparation step). At this time, since the maximum outer diameter d of the flange portion 30 is set to be smaller than the inner diameter D of the shaft hole 1a, the tips of the first protruding portion 36a and the second protruding portions 36b, 36c are set on the inner surface 1f of the shaft hole 1a. The pipe 20 can be inserted without any trouble while being slidably contacted as appropriate. As a result, a rotor (rotating body) 1 equipped with the temperature measuring device 10 according to the present embodiment and a turbine provided with the rotor 1 are configured.

In particular, the maximum outer diameter d of the flange portion 30 is set to be smaller than the inner diameter D of the shaft hole 1a by the insertion clearance or more considering the steps 7a, 7b, 7c, 7d, so that the steps 7a, 7b, 7c, Even in 7d, the flange portion 30 can be inserted into the shaft hole 1a without any trouble, and good workability is ensured.

When rotating the rotor 1, the rotation center O ₀ of the center of gravity G ₂ is the rotor 1 of the temperature measuring device 10, since the side of detector 41 is disposed eccentric to the (first half) P1, Each part of the temperature measuring device 10 receives a centrifugal force in this eccentric direction. Thereby, as shown by the two-dot chain line in FIG. 1 (a), in the axis 1a of the rotor 1 (see white arrows) each flange portion 30 is the centrifugal force direction, i.e., the center of gravity of the temperature measuring device 10 G ₂ Is displaced to the side (first half) P1 where the detection unit 41 is eccentric, and the detection unit 41 is in pressure contact with the inner surface 1f of the center of gravity 1a.

Therefore, during the rotation of the rotor 1, the detection unit 41, which is in pressure contact with the inner surface 1f of the axis 1a, generates a thermoelectromotive force corresponding to the temperature of the inner surface 1f (rotor inner surface metal temperature), and this thermoelectric force is generated from the outside of the rotor 1. The thermoelectromotive force of 40 is taken out as a detection signal, and the temperature of the inner surface 1f is measured (measurement step).

As described above, according to the temperature measuring device 10, each detection unit 41 is surely pressed against the inner surface 1f of the axis 1a by utilizing the centrifugal force generated in the temperature measuring device 10 as the rotor 1 rotates. Since the temperature of the inner surface 1f (rotor inner surface metal temperature) is measured, a highly reliable measurement result can be obtained. In particular, since the center of gravity G ₂ is arranged on a plane including the axis O _{1 of the} pipe 20 and the detection point 41p of the detection unit 41, the centrifugal force efficiently acts on the pressure contact of the detection unit 41 to the inner surface 1f. , The detection unit 41 can be reliably pressed against the inner surface 1f to obtain a highly reliable measurement result.

For example, since the rotor of a steam turbine is exposed to a high temperature, what kind of temperature state the rotor is in during operation is important information in rotor development such as selection of rotor material, but this temperature measuring device 10 According to the report, such information can be obtained with high accuracy, which can contribute to the development of the rotor.

When the pipe 20 is inserted, the tips of the first protruding portion 36a and the second protruding portions 36b, 36c are shown by a two-dot chain line in FIG. As described above, chamfer-shaped notches 37a and 37b may be provided at the front edge portion and the trailing edge portion in the insertion direction of the tip end (outer peripheral side tip) of the first protruding portion 36a. Further, if the notches 37a and 37b are formed with a smooth curved surface, the sliding contact can be further smoothed. Further, the second projecting portion 36b, Taking a large notch 37b of 36c, it is also possible to decenter larger centroid _G 1, _{G 2.}

2nd Embodiment [Configuration of temperature measuring device]
The temperature measuring device 10B for a rotating body according to the present embodiment differs from that of the first embodiment only in the shape of the flange portion 30.
That is, as shown in FIG. 4, in the flange portion 30B of the present embodiment, two notched portions 35d and 35e notched with respect to the reference circle 31c indicated by the alternate long and short dash line are formed on the outer peripheral portion 31B. There is. The cutout portions 35d and 35e are mainly formed on the side of the flange portion 30B opposite to the side on which the detection portion 41 of the thermocouple 40 is arranged. A first protruding portion 36d and a second protruding portion 36e are formed between the cutout portions 35d and 35e, respectively. The tip portions of the protruding portions 36d and 36e are located in a reference circle.

Of these, the first protrusion 36d is arranged on the flange portion 30 on the side where the thermocouple 40 detection portion 41 is arranged, and the second protrusion 36e is arranged on the flange portion 30 where the thermocouple 40 detection portion 41 is arranged. It is located on the opposite side of the side. Further, similarly to the first embodiment, the circumferential length W4 of the first protruding portion 36d is set to be sufficiently larger than the circumferential length W5 of the second protruding portion 36e (W4 >> W5).

Such shape setting, the center of gravity G _1B of the flange portion 30B, to the center O ₁ of the reference circle 31c, is disposed eccentrically on the side of the detector 41 is disposed (the first half) P1 position There is. Again, the center of gravity _{G 1B} of the flange portion 30B is located on the straight line connecting the detection point 41p of the center _{O 1} and the detector 41 of the reference circle 31c, it is the most preferred eccentrically, the center of gravity _{G 1B} is , it may deviate from a straight line connecting the center O ₁ and the detection point 41p.

Thus, the center of gravity G _2B on the cross section of the temperature measuring device 10 consisting of pipes 20 and the flange portion 30B also, with respect to the axis O ₁ of the temperature measuring device 10, the side where the detection unit 41 is disposed (the 1 half) It is arranged at a position eccentric to P1.

Further, also in the present embodiment, as in the first embodiment, in order to secure the insertion clearance, the diameter d of the reference circle 31c, which is the maximum outer diameter of the flange portion 30B, is larger than the inner diameter D of the shaft hole 1a of the rotor 1. It is set small. In particular, the insertion clearance is set large so that the flange portion 30 can enter the shaft hole 1a without any trouble even at the steps 7a, 7b, 7c, and 7d.
Except for these configurations, the temperature measuring device 10B is configured in the same manner as in the first embodiment.

[Action and effect]
Since the temperature measuring device 10B for the rotating body according to the present embodiment is configured as described above, the same operations and effects as those of the first embodiment can be obtained.
That is, since the maximum outer diameter d of the flange portion 30B is set sufficiently smaller than the inner diameter D of the shaft hole 1a, the pipe 20 can be inserted without any trouble.
Further, by utilizing the centrifugal force generated in the temperature measuring device 10B as the rotor 1 rotates, each detection unit 41 is surely pressed against the inner surface 1f of the axial center 1a to measure the temperature of the inner surface 1f. Highly reliable measurement results can be obtained.

Third Embodiment [Configuration of temperature measuring device]
The temperature measuring device 10C for the rotating body according to the present embodiment differs from that of the first embodiment only in the configuration of the detection unit 41C of the thermocouple 40C.
That is, as shown in FIG. 5, in the detection unit 41C of the thermocouple 40C, the tip of the thermocouple 40C is bent and formed so as to make line contact (or surface contact) with the inner surface 1f of the axial center 1a of the rotor 1. It is composed. In the present embodiment, the tip of the thermocouple 40C is bent so as to be oriented in the axial direction of the inner surface 1f of the axial center 1a of the rotor 1, but is bent so as to be oriented in the circumferential direction of the inner surface 1f of the axial center 1a. You may.

Further, the wiring groove 34C is also formed so as to extend to the outer peripheral portion 31C of the flange portion 30C, and the detection portion 41C is wired along the wiring groove 34C of the outer peripheral portion 31C.
Further, a heat insulating material 70 is interposed between the wiring groove 34C and the thermocouple 40C (including the detection unit 41C).
Other than this, it is configured in the same manner as in the first embodiment.

[Action and effect]
Since the temperature measuring device 10C of the rotating body according to the present embodiment is configured as described above, the same operations and effects as those of the first embodiment can be obtained, and the detection unit 41C is the axis of the rotor 1. Since the line contact (or surface contact) is made with the inner surface 1f of 1a, the temperature of the inner surface 1f can be measured stably and accurately.

Further, since the heat insulating material 70 is interposed between the wiring groove 34C and the thermocouple 40C (including the detection unit 41C), the thermocouple 40C is more accurate because the temperature influence of the flange portion 30C is suppressed. The temperature of the inner surface 1f can be measured well.

In this embodiment, the detection unit 41C is in line contact (or surface contact) with the inner surface 1f, and the heat insulating material 70 is interposed between the wiring groove 34C and the thermocouple 40C. Both are provided, but only one of these may be provided.

Fourth Embodiment [Configuration of temperature measuring device]
In the flange portion 30D of the temperature measuring device 10D of the rotating body according to the present embodiment, the flange portion 30D has a predetermined rotation direction (circumference) with respect to the inner surface 1f of the axis 1a with respect to the flange portion 30 of the first embodiment. A guide mechanism 80 is added to guide the position (phase) of the direction). Other than this, it is configured in the same manner as that of the first embodiment.

That is, as shown in FIG. 6, the guide mechanism 80 is formed by embedding the base portion 81a in the inner surface 1f of the axial center 1a, extending in the axial direction, and the outer peripheral portion 31D of the flange portion 30D. It is configured to include a groove 82. The tip edge 81b of the guide rail 81 projects into the internal space of the axis 1a. Both sides 81c and 81d of the guide rail 81 toward the tip edge 81b are configured as guide surfaces parallel to each other.

The guide groove 82 of the flange portion 30D includes sliding contact surfaces 81a and 81b facing both guide surfaces 81c and 81d, and guides of the flange portion 30D when the pipe 20 of the temperature measuring device 10D is inserted into the axial center 1a. The sliding contact surfaces 81a and 81b of the groove 82 are brought into sliding contact with the guide surfaces 81c and 81d of the guide rail 81. As a result, each flange portion 30D becomes a position (phase) in a predetermined rotation direction (circumferential direction) with respect to the inner surface 1f of the axial center 1a.

Here, both guide surfaces 81c and 81d are located parallel to the direction in which the temperature measuring device 10D receives the centrifugal force, and when the temperature measuring device 10D moves by receiving the centrifugal force, the sliding contact surface 81a , 81b and the sliding contact portions between the guide surfaces 81c and 81d are set so as not to become resistance to this movement.
Other than this, it is configured in the same manner as in the first embodiment, the center of gravity G _1D of the flange portion 30D is similarly eccentric, and the center of gravity G _2D of the temperature measuring device 10D is also eccentric.

[Action and effect]
Since the temperature measuring device 10D of the rotating body according to the present embodiment is configured as described above, the same operations and effects as those of the one embodiment can be obtained, and each flange portion 30D has an axial center 1a. Since the position is in the predetermined rotation direction with respect to the inner surface 1f of the above, the detection unit 41E is pressed against the position of the inner surface 1f of the axis 1a in the predetermined rotation direction to reliably measure the temperature of the required portion of the inner surface 1f. There is an effect that can be done.

[Other]
Although the embodiments according to the present invention have been described above, the present invention can be implemented by appropriately modifying the above embodiments.
For example, in each of the above embodiments, the two flange members 32, 33 or 32C, 33C are polymerized in the thickness direction to form the flange portions 30, 30B to 30D, and the two flange members 32, 33 or 32C, 33C are formed. The wiring grooves 34 and 34C were formed between the two, and the thermocouples 40 and 40C were wired, but the flange portion may be composed of only one flange member.

In this case, as in the temperature measuring device 10E shown in FIG. 7, the wiring hole 34E is processed in the flange portion 30E so as to penetrate from the pipe 20 side to the outer peripheral portion 31E, and the thermocouple 40E is inserted in the wiring hole 34E. You may wire it. In this case as well, the center of gravity G _1E of the flange portion 30E is eccentric, and the center of gravity G _2E of the temperature measuring device 10E is also eccentric as in the first embodiment.

Further, the in each of the embodiments and the modified example (FIG. 7), by decentering the center of gravity _{G 1, G 1B} of the flange portion 30,30B~30E respect to the axis _{O 1} of the temperature measuring device 10, the temperature measuring device Although the center of gravity _{G 2, G 2B} of the 10 that is eccentric to the axis _{O 1,} by decentering the center of gravity of the pipe 20 with respect to the axis _{O 1} of the temperature measuring device 10, the temperature measuring device 10 The center of gravity G ₂ of the above may be eccentric with respect to the axial center O ₁ , and these may be combined.

Further, in the flange portions 30, 30B to 30E of each of the above embodiments, the front view shapes of the cutout portions 35a, 35b, 35c, 35d, 35e, the first protruding portions 36a, 36d, and the second protruding portions 36b, 36c, 36e. Is an example, and various shapes can be adopted. From the viewpoint of setting the eccentricity of the center of gravity position, it is effective to pay attention not only to the front view shape of the flange portion but also to the thickness of the flange portion and set the side where the center of gravity position is eccentric to be thick and the opposite side to be thin. ..

Further, in each of the above embodiments and modifications, the thermocouple is applied to the temperature sensor, but the temperature sensor to be applied is not limited to this, and any contact type temperature sensor can be widely applied.
Further, in each of the above embodiments and modifications, the rotating body to which the temperature measuring device for the rotating body is applied is a rotor of a rotating device (for example, a steam turbine), but this device can be applied to various rotors, and also. Even if it is not a rotor, it can be widely applied as long as it is a rotating body of a rotating machine and has a shaft hole.

1 Rotor as a rotating body 1a Shaft hole 1f of rotor 1 Inner surface of shaft hole 1a 2,3,4 Roller part 5,6 Coupling points 5a, 5b, 6a, 6b Welded joints 7a, 7b, 7c, 7d Steps (welding) Step)
10,10B-10E Temperature measuring device 20 Pipe (cylindrical member)
21 Inside of pipe 20 22, 22A to 22E Pipe material (cylindrical material)
30,30B to 30E Flange part 31,31C, 31D, 31E Outer circumference part of flange part 30, 30B to 30E 31c Reference circle 32,33 Flange member 34,34C Wiring groove 34E Wiring hole 35a, 35b, 35c, 35d, 35e Notch 36a, 36d First protrusion 36b, 36c, 36e Second protrusion 40, 40C, 40E Thermocouple (temperature sensor)
41, 41C, 41E Detection part 41p Detection point 50 Joint flange part 61 Bolt 70 Insulation material 80 Guide mechanism 81 Guide rail 82 Guide groove G ₁ , G _1B , G _1D , G _1E Center of gravity of flange part 30, 30B, 30D, 30E Center of gravity of G ₂ , G _2B , G _2D , G _2E temperature measuring device 10, 10B, 10D, 10E (center of gravity of device)
O ₁ Center of reference circle 31c, axis of pipe 20, axis of temperature measuring device O ₀ Center of rotation of rotor 1 BL reference line P1 1st half P2 2nd half W1 Circumferential length of 1st protrusion 36a W2, W3 Circumferential length of the second protrusions 36b, 36c W4 Circumferential length of the first protrusion 36d W5 Circumferential length of the second protrusion 36e

Claims (15)

A temperature measuring device that measures the temperature of the inner surface of a shaft hole along the center of rotation of a rotating body.
A tubular member inserted and installed in the shaft hole,
The flange portion installed on the tubular member and
A temperature sensor that is wired from the inside of the tubular member to the outer peripheral portion of the flange portion and has a detection portion at the tip of the wiring that projects outward from the outer peripheral portion of the flange portion and comes into contact with the inner surface. Prepare,
The maximum outer diameter of the flange portion is set smaller than the inner diameter of the shaft hole.
A temperature measuring device for a rotating body, characterized in that the center of gravity of the device when inserted and installed in the shaft hole is eccentric to the side where the detection unit is arranged with respect to the center of rotation of the rotating body. The first aspect of the present invention is characterized in that the center of gravity of the flange portion in a state of being inserted and installed in the shaft hole is eccentric to the side where the detection portion is arranged with respect to the rotation center of the rotating body. The temperature measuring device for the rotating body described. The temperature measuring device for a rotating body according to claim 2, wherein a notch portion is formed on the outer peripheral portion of the flange portion to bring the center of gravity of the flange portion into the eccentric state. A first protruding portion whose outer circumference protrudes outward in the radial direction is formed in the first half portion of the flange portion on the side where the detection portion is arranged with respect to the axial center of the tubular member, and the first A second protruding portion whose outer circumference protrudes outward in the radial direction is formed in the second half portion opposite to the first half portion.
The notch is formed on the outer peripheral portion between the first protruding portion and the second protruding portion.
The temperature measuring device for a rotating body according to claim 3, wherein the first protruding portion is formed in a size wider in the circumferential direction than the second protruding portion. The temperature of the rotating body according to any one of claims 1 to 4, wherein the center of gravity of the device is arranged on a plane including the axis of the tubular member and the detection point of the detection unit. Measuring device. The temperature measuring device for a rotating body according to any one of claims 1 to 5, wherein the outer periphery of the flange portion is formed in a smooth curved surface shape. A wiring hole for wiring the temperature sensor is machined in the flange.
The temperature measuring device for a rotating body according to any one of claims 1 to 6, wherein a heat insulating material is interposed between the temperature sensor and the wiring hole. The temperature measuring device for a rotating body according to any one of claims 1 to 7, wherein the detection unit is formed in a linear shape capable of linear contact with the inner surface. Claim 1 is characterized in that a guide mechanism for guiding the circumferential position of the flange portion with respect to the shaft hole of the rotor is provided between the outer peripheral portion of the flange portion and the shaft hole of the rotor. The temperature measuring device for a rotating body according to any one of 8 to 8. A plurality of detection target locations that require temperature detection on the inner surface are distributed in the axial direction of the rotating body and are arranged.
The temperature of the rotating body according to any one of claims 1 to 9, wherein a plurality of the flange portions are fixedly provided to the tubular member at positions corresponding to the detection target portions. Measuring device. The temperature measuring device for a rotating body according to claim 10, wherein the positions of the centers of gravity of the plurality of flange portions are eccentric in the same direction with respect to the axial center of the tubular member. The temperature measuring device for a rotating body according to any one of claims 1 to 11 , wherein the tubular member is joined to the rotating body at one end. A rotating body with a shaft hole
A rotating body, characterized in that the temperature measuring device for the rotating body according to any one of claims 1 to 12 is mounted. A turbine according to claim 13, wherein the rotating body is provided as a rotor. A method for measuring the temperature of a rotating body, which measures the temperature of the inner surface of the shaft hole of the rotating body by using the temperature measuring device for the rotating body according to any one of claims 1 to 12.
The tubular member is inserted into the shaft hole, the detection portion of the temperature sensor is arranged so as to face a detection target portion of the inner surface that requires temperature detection, and the tubular member is installed on the rotating body. Preparation process and
The rotating body is rotated to rotate the tubular member integrally with the rotating body, and the centrifugal force generated toward the eccentric side of the flange portion due to this rotation causes the detection portion to move to the inner surface. A method for measuring the temperature of a rotating body, which comprises a measuring step of abutting and measuring the temperature of the inner surface.

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