JP6192033B2 - Pipe pump clamping device - Google Patents

Description

  The present invention relates to a clamping device for a measurement pipe for measuring the flow rate of a jet pump in a pressure vessel of a boiling water reactor.

  A boiling water reactor has a recirculation system using a jet pump. As shown in FIG. 25, a plurality of jet pumps 102 are provided in the reactor pressure vessel 101 so as to surround the core 104 (the shroud 105), whereby the reactor recirculation system together with the recirculation pump 103 is provided. A coolant (reactor water) 106 having a flow rate required to configure and change the output of the nuclear reactor is supplied to the reactor core 104. The core 104 includes a fuel assembly, a control rod, and the like (not shown), and is accommodated in the shroud 105.

  In such a nuclear reactor, a part of the coolant 106 that forcibly circulates the core 104 is taken out of the reactor pressure vessel 101 and pressurized by the recirculation pump 103, and then the coolant is discharged from the nozzle of the jet pump 102. 106 is jetted as driving water (coolant) at high speed. At this time, the coolant 106 around the nozzle is sucked into the jet pump 102 from the nozzle to the inlet mixer 113, and the coolant 106 and driving water are mixed inside the jet pump 102 and sent to the lower plenum 107 of the core. Recirculated.

Next, the structure of the jet pump 102 will be described with reference to FIG.
As shown in FIG. 26, the jet pump 102 has a riser pipe 109. The riser pipe 109 is fixed to the reactor pressure vessel 101, and the coolant 106 supplied from the recirculation pump 103 is supplied to the recirculation water inlet port 101 a (see FIG. 25) and the riser elbow 108 in the reactor pressure vessel 101. To be introduced into the furnace. A pair of elbows 111 is connected to the upper portion of the riser pipe 109 via a transition piece 110. A pair of inlet mixers 113 are connected to the pair of elbows 111 via a pair of nozzles 112. Diffusers 114A and 114B are connected to the pair of inlet mixers 113, respectively. The jet pump 102 includes a bracket 115, a support 116, a wedge 117, a beam 118, a riser brace 119, a measurement tube 120, and measurement tube supports 121A and 121B.

  Here, the measurement pipe 120 measures the flow rate in the diffuser 114 by transmitting the pressure in the diffuser 114 to a differential pressure gauge provided outside the reactor pressure vessel 101. The measuring tube 120 is attached by welding to the diffuser 114 via the measuring tube supports 121A and 121B. For example, Patent Document 1 proposes a technique in which an arm is attached to a clamp device that clamps the measurement tube 120 and the clamp device is fixed, and then the measurement tube 120 is restrained from two directions.

JP 2004-212336 A

  By the way, since the jet pump 102 is installed in the coolant 106 in the nuclear reactor, and high-speed fluid flows also inside the jet pump 102, it receives fluid vibrations from both the outside and inside of the jet pump 102. Become. Then, the vibration is transmitted to the measurement tube 120. If the frequency of the vibration coincides with the natural vibration frequency of the measurement tube 120 at this time, the stress acting on the measurement tube 120 due to resonance increases, and the measurement tube 120 itself or the measurement tube 120 is measured. There is a possibility of damaging the welded portion between the tube 120 and the measurement tube support 121A.

  Temporarily, as a method of repairing the measuring tube 120 in the case where damage has occurred, methods such as welding or mechanical joints are conceivable, but since such repair work is underwater work, the repair device also becomes large, Moreover, the repair work will take a long time.

  Therefore, it is necessary to prevent damage to the measurement tube 120 itself or the welded portion between the measurement tube 120 and the measurement tube support 121A. However, in the conventional technique described in Patent Document 1, the position where the clamp device is attached is the diffuser. It is not designed so that it can be attached to the narrow part at the bottom of 114A, but can prevent damage to the welded part of the measurement pipe and the measurement pipe support in the narrow part at the bottom of the diffuser and the vicinity of the welded part. It wasn't.

  Moreover, in the prior art described in Patent Document 1, the clamp device holds the clamp device itself via an arm. For this reason, when restraining the pipe located at the lower part of the diffuser, the diameter of the arm is further expanded, so that the clamp device can be transported and attached to the lower part of the diffuser that becomes the narrow part by configuring a jet pump. It was necessary to remove other equipment such as the inlet mixer.

  The present invention solves the above-mentioned problems of the prior art, and even if fluid vibration is applied from all directions to the welded portion between the measurement tube support of the diffuser and the measurement tube, the stress caused thereby can be reduced. It is an object of the present invention to provide a clamp device for a jet pump measuring pipe.

The present invention relates to a jet pump measurement pipe clamping device that clamps a flow pipe for measuring a flow rate attached to a diffuser of a jet pump installed in a reactor pressure vessel via a support, and includes the diffuser and the shroud. A first pedestal member disposed in between; a second pedestal member disposed between the first pedestal member and the shroud and slidably attached to the first pedestal member; and below the first pedestal member A first abutting member that is pivotally supported and abuts against the outer peripheral surface of the diffuser, and a second abutment that is pivotally supported below the second pedestal member and abuts against the outer peripheral surface of the shroud. And a member, and the first base member is movably attached to the first base member via a tightening bolt, and the second contact member is screwed into the first contact portion by screwing the tightening bolt. Comprising: a first pressing member for operating in a direction away, a clamping mechanism for clamping the measuring tube, a connecting mechanism for connecting the said first abutment member and the clamping mechanism, from the clamp mechanism, the It is provided below the first contact member .

  According to the present invention, even when fluid vibration is applied to the measurement tube support of the diffuser and the welded portion of the measurement tube from all directions, the stress caused by the vibration can be reduced.

It is a whole perspective view showing the clamp device concerning a 1st embodiment. It is a perspective view when the clamp apparatus which concerns on 1st Embodiment is seen from another direction. It is a perspective view which shows a 2nd base member. It is a perspective view which shows the base mechanism for fixation. It is a top view which shows the base mechanism for fixation. It is the sectional view on the AA line of FIG. It is a perspective view which shows the stationary-side clamp part of a 1st clamp mechanism. It is a perspective view which shows the movable side clamp part of a 1st clamp mechanism. It is a top view which shows a 1st clamp mechanism. It is a side view which shows a 1st clamp mechanism. FIG. 10 is a sectional view taken along line B-B in FIG. 9. It is a side view which shows the clamp apparatus which concerns on 1st Embodiment. It is a perspective view when the attachment state of the clamp device concerning a 1st embodiment is seen from the gap side. It is sectional drawing which shows the attachment state of the clamp apparatus which concerns on 1st Embodiment. It is a top view which shows the attachment state of the clamp apparatus which concerns on 1st Embodiment. It is a whole perspective view which shows the clamp apparatus which concerns on 2nd Embodiment. It is a perspective view when the clamp apparatus which concerns on 2nd Embodiment is seen from another direction. It is a top view which shows the clamp apparatus which concerns on 2nd Embodiment. It is a side view which shows the clamp apparatus which concerns on 2nd Embodiment. It is a perspective view which shows an arm. It is the C section expansion perspective view of FIG. It is sectional drawing which shows the attachment state of the clamp apparatus which concerns on 2nd Embodiment. It is a top view which shows the attachment state of the clamp apparatus which concerns on 2nd Embodiment. It is a top view which shows the connection mechanism of the clamp apparatus which concerns on 3rd Embodiment. It is explanatory drawing which shows an example of the recirculation system in a boiling water reactor. It is explanatory drawing which shows the structure of a jet pump.

  Hereinafter, a jet pump measurement piping clamping device according to this embodiment will be described with reference to the drawings. The jet pump measuring tube clamping devices 1A and 1B of the present embodiment are flow rate measuring devices attached to the diffusers 114A and 114B of the jet pump 102 installed in the reactor pressure vessel 101 (see FIG. 25) via the measuring tube support 121A. The measuring tube 120 is clamped.

(First embodiment)
FIG. 1 is an overall perspective view showing the clamping device according to the first embodiment, FIG. 2 is an overall perspective view when the clamping device according to the first embodiment is viewed from another direction, and FIG. 3 is a perspective view showing the second pedestal member. 4 is a perspective view showing the fixing pedestal mechanism, FIG. 5 is a plan view showing the fixing pedestal mechanism, FIG. 6 is a cross-sectional view taken along line AA of FIG. 5, and FIG. FIG. 8 is a perspective view showing the movable side clamp part of the first clamp mechanism, FIG. 9 is a plan view showing the first clamp mechanism, FIG. 10 is a side view showing the first clamp mechanism, and FIG. 9 is a cross-sectional view taken along line BB in FIG. 9, and FIG. 12 is a side view showing the clamp device according to the first embodiment. In FIG. 1, illustration of the shroud 105 (see FIG. 25) side is omitted.

  As shown in FIG. 1, the clamp device 1A is disposed in a narrow portion at the lower end of the diffuser 114A, and includes a fixing base mechanism 2A, a first clamp mechanism 3A, and a coupling mechanism 4. ing.

  The fixing pedestal mechanism 2 </ b> A includes a first pedestal member 10, a second pedestal member 20, a first wedge member (pressing member) 30, a first contact member 40, and a second contact member 50. Has been.

  As shown in FIG. 2, the first pedestal member 10 has a substantially L-shaped block shape, a rectangular parallelepiped pedestal 10a extending in the circumferential direction of the diffuser 114A (see FIG. 1), and the longitudinal direction of the pedestal 10a. And a rectangular parallelepiped pedestal portion 10b extending from one end to the shroud 105 side.

  Returning to FIG. 1, the second pedestal member 20 has a substantially rectangular parallelepiped shape, and an engagement recess 20 a (slide groove) into which a part of the pedestal portion 10 b of the first pedestal member 10 is slidably inserted is formed. ing. Thereby, it can slide in the direction (diffuser 114A direction and shroud 105 direction) which the 1st base member 10 and the 2nd base member 20 approach, and the space | interval. Although not shown, the fixing base mechanism 2 </ b> A is provided with a retaining member that prevents the second base member 20 from coming out of the first base member 10.

  As shown in FIG. 3, the 2nd base member 20 has the taper surface 20b which slides with the 1st wedge member 30 (refer FIG. 2). The tapered surface 20b is configured to be inclined from the upper surface 20c of the second pedestal member 20 toward the pedestal portion 10a (see FIG. 2). Further, the lower edge portion 20b1 of the tapered surface 20b is located at a substantially central portion in the height direction (up and down direction), and the lower portion of the lower edge portion 20b1 extends in the vertical direction.

  Returning to FIG. 2, the first wedge member 30 is disposed in the upper part between the first pedestal member 10 and the second pedestal member 20. The first wedge member 30 is L-shaped in a side view from the diffuser 114A side, and extends in a vertical direction, and a pedestal portion of the first pedestal member 10 from the upper end portion of the slide portion 30a. 10b and a mounting portion 30b extending in a direction perpendicular to the sliding portion 30a. The entire surface of the sliding portion 30a on the diffuser 114A side is formed by a plane along the vertical direction.

  The fastening bolt B1 is inserted vertically downward in the upper portion of the mounting portion 30b and screwed into the upper surface of the pedestal portion 10b, whereby the first wedge member 30 is held by the first pedestal member 10. Further, by screwing the tightening bolt B1, it can be moved downward in the vertical direction, and by loosening the tightening bolt B1, it can be moved upward in the vertical direction.

  Further, the first wedge member 30 is configured such that the vertical surface 30a1 facing the diffuser 114A side of the sliding portion 30a slides with the inner side surface 10a1 (see FIG. 4) of the pedestal portion 10a of the first pedestal member 10. Has been.

  As shown in FIG. 4, the first wedge member 30 has a tapered surface 30 c formed in parallel to the tapered surface 20 b on the surface facing the shroud 105. The tapered surface 30c is configured to approach the vertical surface 30a1 of the sliding portion 30a from the upper part to the lower part, and is configured to taper from the upper part to the lower part in the vertical direction in a side view. Further, the tapered surface 30 c of the first wedge member 30 is configured to slide with the tapered surface 20 b of the second pedestal member 20.

  As shown in FIG. 5, the first abutting member 40 abuts on the diffuser 114 </ b> A, has a substantially bow shape in plan view, and is provided below the first pedestal member 10. The first contact member 40 is connected to the first pedestal member 10 via the connecting pin P1 so as to be rotatable in the arrow W1 direction.

  Further, the position of the connecting pin P <b> 1 is closer to one end side of the first contact member 40 than the central portion in the longitudinal direction (arc direction) of the first contact member 40. Therefore, one end side in the longitudinal direction of the first abutting member 40 protrudes short from the first pedestal member 10, and the other end side in the longitudinal direction of the first abutting member 40 is longer than one end side from the first pedestal member 10. Protrusively long. Therefore, when the first contact member 40 rotates, the contact between the first contact member 40 and the diffuser 114 </ b> A can be prevented from being obstructed by the first base member 10.

  The first abutting member 40 is configured such that the curvature of the surface 40a facing the diffuser 114A is substantially equal to the curvature of the outer peripheral surface 114a (see FIG. 1) of the diffuser 114A. Further, the surface 40a protrudes from the first base member 10 in plan view. Thereby, the surface 40a facing the diffuser 114A of the first contact member 40 is in contact with the outer peripheral surface 114a (see FIG. 1) of the diffuser 114A. In addition, the structure which a part of surface 40a touches the outer peripheral surface 114a of the diffuser 114A may be sufficient.

  The first contact member 40 is configured to contact the lower surface 10c (see FIG. 12) of the first base member 10. Thereby, the dimension of a perpendicular direction (up-down direction) can be comprised short, and it becomes possible to achieve size reduction of 1 A of clamp apparatuses.

  Further, the first contact member 40 is formed with a long hole 40b penetrating in the vertical direction along the surface 40a facing the diffuser 114A. The long hole 40b is formed to be curved so as to follow the curvature of the surface 40a from the substantially central portion in the longitudinal direction of the first contact member 40 toward one end.

  The second contact member 50 contacts the outer peripheral surface 105a (see FIG. 14) of the shroud 105, has a substantially triangular shape (see FIG. 5) in plan view, and has the second base member 20 and the connecting pin P2 connected thereto. And is movably connected in the direction of arrow W2. Further, the second contact member 50 has one side surface 50a facing the shroud 105 (see FIG. 25), and the one side surface 50a projects from the second pedestal member 20 in a plan view. Therefore, when the second contact member 50 rotates, the contact between the second contact member 50 and the shroud 105 can be prevented from being obstructed by the second base member 20.

  The second contact member 50 is configured to contact the lower surface 20d (see FIG. 12) of the second pedestal member 20. Thereby, the dimension of a perpendicular direction (up-down direction) can be comprised short, and it becomes possible to achieve size reduction of 1 A of clamp apparatuses.

Next, a mechanism for operating the first contact member 40 and the second contact member 50 will be described with reference to FIG.
As shown in FIG. 6, the state before the clamp device 1 </ b> A operates is such that the lower end of the vertical surface 30 a 1 of the first wedge member 30 is in contact with the inner surface 10 a 1 of the first base member 10 and the taper of the first wedge member 30. It arrange | positions so that the lower end of the surface 30c may contact | connect the taper surface 20b of the 2nd base member 20. FIG.

  Then, by screwing the fastening bolt B1 into the first pedestal member 10, the vertical surface 30a1 of the first wedge member 30 is moved to the first pedestal member by moving the first wedge member 30 vertically downward (arrow Z1 direction). 10 along the inner surface 10a1 and the tapered surface 30c of the first wedge member 30 slides along the tapered surface 20b of the second pedestal member 20, whereby the second pedestal member 20 is moved in the direction of the arrow Y1. That is, in other words, the second abutting member 50 operates in the direction of the arrow Y2 while moving in the direction away from the first pedestal member 10.

  Returning to FIG. 1, the first clamp mechanism 3 </ b> A clamps the measurement tube 120, and includes a fixed-side clamp 61, movable-side clamps 62 </ b> A and 62 </ b> B, and a second wedge member 63.

  As shown in FIG. 7, the fixed-side clamp 61 has recesses 61b and 61c formed on a base 61a that has a substantially rectangular parallelepiped shape so that the concave surface faces the shroud 105 side. Moreover, the recessed parts 61b and 61c have penetrated in the perpendicular direction (up-down direction). Moreover, the recessed parts 61b and 61c are arrange | positioned at intervals in the longitudinal direction.

  Further, the fixed side clamp 61 is formed with hook-shaped holding portions 61e and 61e extending downward from the lower surface 61d corresponding to the concave portions 61b and 61c. Each holding portion 61e is configured such that a holding surface 61e1 holding the measuring tube 120 faces the shroud 105 side.

  The holding portions 61e and 61e are configured not to protrude into the recesses 61b and 61c from the bottom surfaces 61b1 and 61c1 of the recesses 61b and 61c (see FIG. 11). The holding portions 61e and 61e are formed shorter than the width of the recesses 61b and 61c (the width in the longitudinal direction of the fixed side clamp 61), and are disposed so as to be separated from each other in the recesses 61b and 61c.

  As shown in FIG. 8, the movable-side clamp 62A includes a base 62a that is slidably supported by the fixed-side clamp 61 (see FIG. 7), and a hook-shaped holding portion 62b that extends vertically downward from the base 62a. It is composed of Note that the movable side clamp 62 </ b> A shown in FIG. 8 corresponds to the concave portion 61 b of the fixed side clamp 61. The movable side clamp 62B (see FIG. 2) has the same configuration as that of the movable side clamp 62A except that the position of the holding portion 62b is different. Therefore, the description of the movable side clamp 62B is omitted.

  On both side surfaces 62a1 and 62a1 of the base portion 62a, slide concave portions 62a2 and 62a2 are formed that are slidably supported by the concave portion 61b of the fixed side clamp 61. The base 62a is formed with a flat surface 62a3 corresponding to the bottom surface 61b1 of the recess 61b.

  The base portion 62a is formed with a hook-shaped holding portion 62b extending downward at a height position facing the holding portion 61e. The holding portion 62b is configured not to protrude from the surface 62a3 described above toward the holding portion 61e.

  In addition, a taper surface 62a4 is formed on the surface of the base portion 62a opposite to the surface 62a3 (the surface on the shroud 105 side). The tapered surface 62a4 is inclined so as to be separated from the holding portion 61e from the upper surface 62a5 in the vertical direction downward (see FIG. 11).

  As shown in FIG. 9, the second wedge member 63 moves the movable side clamps 62A and 62B, and is disposed on the upper side of the fixed side clamp 61 including the movable side clamps 62A and 62B. Further, the second wedge member 63 is formed to be shorter than the longitudinal direction of the fixed side clamp 61 and shorter than the short direction in the plan view of FIG. 9. 9, one end in the longitudinal direction of the second wedge member 63 coincides with one end in the longitudinal direction of the fixed-side clamp 61, and the other end in the longitudinal direction of the second wedge member 63 is the movable-side clamp. It arrange | positions so that it may be located in the middle of 62A (substantially center of the width direction).

  The second wedge member 63 is attached to the fixed-side clamp 61 via tightening bolts B2 and B3. The fastening bolt B2 is located at one end in the longitudinal direction, and the fastening bolt B3 is located between the recess 61b and the recess 61c. By screwing the tightening bolts B2 and B3 into the fixed side clamp 61 side, the second wedge member 63 is movable toward the fixed side clamp 61 side by the screwing force.

  As shown in FIG. 10, the second wedge member 63 has tapered surfaces 63a and 63b formed at positions corresponding to the movable side clamps 62A and 62B. The tapered surface 63a extends in a direction along the tapered surface 62a4 of the movable side clamp 62A. The tapered surface 63b extends in a direction along the tapered surface 62a4 of the movable side clamp 62B.

  Further, the lower surface (bottom surface) 63c of the second wedge member 63 excluding the portion where the tapered surfaces 63a and 63b are formed is spaced from the upper surface 61g of the fixed-side clamp 61 by a clearance CL when the measuring tube 120 is not clamped. Is configured to do. The clearance CL is set to such a distance that the movable side clamps 62A and 62B can be brought close to the fixed side clamp 61 and the measuring tube 120 can be clamped when the second wedge member 63 is moved toward the fixed side clamp 61. Yes.

  Further, the tightening bolts B2 and B3 pass through the second wedge member 63 while being screwed in, and further pass through while being screwed into the fixed-side clamp 61, and the distal ends of the tightening bolts B2 and B3 extend from the lower surface of the fixed-side clamp 61. It is comprised so that it may protrude below.

The operation of the first clamp mechanism 3A configured as described above will be described with reference to FIG.
As shown in FIG. 11, the second wedge member 63 moves downward in the vertical direction by screwing the fastening bolts B2 and B3 (see FIG. 10) into the fixed-side clamp 61. At this time, when the second wedge member 63 descends in the arrow Z2 direction, the taper surface 63b slides along the taper surface 62a4 of the movable side clamp 62B, so that the movable side clamp 62B is pressed in the Y3 direction and is movable. The measuring tube 120 is clamped by the holding portion 62b of the side clamp 62B and the holding portion 61e of the fixed side clamp 61. Note that the movable side clamp 62A also operates in the same manner as described above, and the measurement tube 120 is clamped by the holding portion 62b and the holding portion 61e.

  Thereby, the measurement tube 120 can be reliably held by the holding portion 62b of the movable side clamps 62A and 62B and the holding portion 61e of the fixed side clamp 61. Note that the configuration in which the fastening bolt B2 is screwed into the fixed side clamp 61 can prevent the movable side clamps 62A and 62B from moving in the direction opposite to the direction Y3 even after the holding of the measuring tube 120 is completed.

  As shown in FIG. 12, the coupling mechanism 4 has a mechanism for moving the first clamp mechanism 3 </ b> A relative to the fixing base mechanism 2 </ b> A, and includes a coupling shaft 71 and a long hole 40 b of the first contact member 40. (See FIG. 5).

  The connecting shaft 71 suspends the first clamp mechanism 3A below the fixing base mechanism 2A, and one end (upper end) is inserted from below into a long hole 40b formed in the first contact member 40. An end (lower end) is rotatably connected to the fixed side clamp 61. In addition, a well-known method is applicable about the mechanism which connects the connection shaft 71 and the fixed side clamp 61 so that rotation is possible.

  The connecting shaft 71 includes a retaining member 72 at its upper end. The retaining member 72 is formed with a diameter larger than the width of the long hole 40b, and is configured so that the connecting shaft 71 does not fall out of the long hole 40b.

  By configuring the first clamp mechanism 3A in this way, the connecting shaft 71 is moved along the long hole 40b, so that the first clamp mechanism 3A is moved along the outer peripheral surface 114a (see FIG. 1) of the diffuser 114A. Can be moved. Therefore, even if the position of the measurement tube support 121A is displaced and the position of the measurement tube 120 (see FIG. 1) is displaced, the first clamp mechanism 3A can reliably hold the measurement tube 120 (see FIG. 1). Become.

  Next, a method of attaching the clamp device 1A according to the first embodiment will be described with reference to FIGS. 13 is a perspective view of the mounting state of the clamping device according to the first embodiment when viewed from the side of the gap, FIG. 14 is a cross-sectional view showing the mounting state of the clamping device according to the first embodiment, and FIG. It is a top view which shows the attachment state of the clamp apparatus which concerns on embodiment.

  As shown in FIG. 13, the clamping device 1 </ b> A is disposed in a narrow portion S <b> 1 (predetermined position) between the diffuser 114 </ b> A and the shroud 105 from the upper part of the reactor pressure vessel 101. Note that the narrow portion S1 is a region surrounded by a symbol R1 in FIG. That is, as shown in FIG. 26, the measurement tube 120 passes through the lower end portion of the diffuser 114A in the horizontal direction, bends upward before the diffuser 114B, and has a plurality of measurement tube supports 121B on the outer peripheral surface 114a of the diffuser 114B. It is fixed by welding or the like. The plurality of U-shaped grooves of the measurement tube support 121A are provided for fixing by welding through other measurement tubes.

  By the way, since the plurality of measurement tube supports 121B are formed so that the interval between the adjacent measurement tube supports 121B is short, the effect of suppressing the vibration of the measurement tube 120 is exhibited, but the measurement disposed at the lower end of the diffuser 114A. Since the pipe support 121A has a large distance L from the other measurement pipe support 121B, the pipe support 121A is more easily affected by vibration, and the welded portion between the measurement pipe 120 and the measurement pipe support 121A is likely to be damaged. . Therefore, it is conceivable to arrange a clamping device at the lower end of the diffuser 114A. However, the diffuser 114A has a pipe diameter that increases from the upper side to the lower side in the vertical direction, so that the diffuser 114A and the shroud 105 through which the measurement pipe 120 passes are arranged. Is gradually narrowed from the upper side to the lower side, and becomes a narrow portion S1 (see FIG. 13) at the lower end portion of the diffuser 114A. For this reason, in a conventional clamping device having a C-shaped arm, the diameter of the arm of the clamping device increases with an increase in the tube diameter of the diffuser 114A, so the measurement tube 120 fixed to the measurement tube support 121A is held. It could not be applied as a clamping device. Therefore, by applying the clamp device 1A, the measurement tube 120 located at the lower end (narrow portion S1) of the diffuser 114A is held, and vibrations acting on the measurement tube 120 at the measurement tube support 121A are reduced. It is a thing.

  As shown in FIG. 13, the clamp device 1A is arranged in the gap (narrow portion S1) between the shroud 105 and the diffuser 114A so that the first clamp mechanism 3A is positioned below the fixing base mechanism 2A. When the clamping device 1A is disposed in the narrow portion S1, the first wedge member 30 is raised with respect to the fixing base mechanism 2A, and the first base member 10 and the second base member 20 approach each other. Arrange them so that they are positioned. Thereby, the 1st base member 10 and the 2nd base member 20 are made to approach, and the maximum width W10 (refer FIG. 5) of the 1st contact member 40 and the 2nd contact member 50 is set to the minimum. Can do. Therefore, it becomes possible to arrange | position the clamp apparatus 1A in the narrow part S1 between the diffuser 114A and the shroud 105. FIG. Further, as shown in FIG. 5, the first clamping mechanism 3A can be accommodated within the above-described maximum width W10, so that the clamping device 1A can be disposed in the narrow portion S1.

  After the clamp device 1A is arranged in the narrow portion S1, the measurement tube 120 is clamped by the first clamp mechanism 3A. That is, when holding the measuring tube 120, the clamping bolts B2 and B3 are operated from above, for example, in a plan view shown in FIG. 5, the fixing base mechanism 2A and the clamping bolts B2 and B3 of the first clamping mechanism 3A are The first clamp mechanism 3A is rotated with respect to the fixing base mechanism 2A so as not to overlap in the vertical direction.

  Then, by screwing the tightening bolts B2 and B3, the second wedge member 63 is lowered, and the measuring tube 120 is clamped by the holding portion 62b of the movable side clamps 62A and 62B and the holding portion 61e of the fixed side clamp 61.

  Then, the position of the connecting shaft 71 in the elongated hole 40b is adjusted to adjust the position of the fixing base mechanism 2A. Further, as shown in FIG. 14, when the tightening bolt B <b> 1 (see FIG. 1) is screwed in, the first wedge member 30 is lowered in the Z <b> 1 direction, and the second pedestal member 20 is separated from the first pedestal member 10 in the direction Y <b> 1. The second abutting member 50 is moved in the Y2 direction and the second abutting member 50 abuts on the outer peripheral surface 105a of the shroud 105. Then, by further screwing the tightening bolt B1, the first contact member 40 presses the outer peripheral surface 114a of the diffuser 114A, the second contact member 50 presses the outer peripheral surface 105a of the shroud 105, and the first contact member 40 and the second contact member 50 are held in a stretched state between the diffuser 114A and the shroud 105.

  Further, as shown in FIG. 15, the first abutting member 40 is supported by the first base member 10 so as to be rotatable in the W1 direction, so that it abuts along the curved surface of the outer peripheral surface 114a of the diffuser 114A. be able to. Further, the second contact member 50 is also supported by the second pedestal member 20 so as to be rotatable in the W2 direction, so that it can be brought into contact with the outer peripheral surface 105a of the shroud 105 at an appropriate angle. Thereby, 1 A of clamp apparatuses can be hold | maintained more reliably.

  As described above, the clamping device 1A according to the first embodiment includes the first pedestal member 10 disposed in the narrow portion S1 between the diffuser 114A and the shroud 105, and the first pedestal member 10 and the shroud 105. A second pedestal member 20 that is disposed and slidably attached to the first pedestal member 10, and a first abutment member that is rotatably supported below the first pedestal member 10 and abuts on the outer peripheral surface 114a of the diffuser 114A 40, a second abutting member 50 that is rotatably supported below the second pedestal member 20 and abuts on the outer peripheral surface 105a of the shroud 105, and is movable to the first pedestal member 10 via a tightening bolt B1. A first wedge member 30 which is attached and operates the second abutment member 50 in a direction away from the first abutment member 40 by screwing the tightening bolt B1; It comprises 0 of the first clamping mechanism 3A for clamping the measuring tube 120 is provided below, the coupling mechanism 4 for coupling the first contact member 40 and the first clamping mechanism 3A, a.

  According to this, the first abutting member 40 and the second abutting member are moved down by moving the first wedge member 30 in the direction away from the second pedestal member 20 and the first pedestal member 10 by the tightening bolt B1. With the member 50, the clamp device 1A can be held in the narrow portion S1 while being stretched against the diffuser 114A and the shroud 105. Further, the first pedestal member 10, the second pedestal member 20, and the first wedge member 30 are disposed between the diffuser 114A and the shroud 105 (narrow portion S1), and the first pedestal member 10 is further below the first pedestal member 10. Since the second abutting member 50 is disposed below the abutting member 40 and the second pedestal member 20, the width of the fixing pedestal mechanism 2A can be set narrow, and further connected to the lower side of the fixing pedestal mechanism 2A. Since the first clamping mechanism 3A is arranged via the mechanism 4, the maximum width W10 (see FIG. 5) of the clamping device 1A can be set narrow. As a result, the maximum width W10 of the clamping device 1A can be reduced, and the clamping device 1A can be carried to the clamping position without removing other devices of the jet pump 102 to the narrowed portion S1 at the lower end of the diffuser 114A. It is possible to clamp the measuring tube 120 arranged in the narrow portion S1. As a result, it is possible to prevent the welded portion between the measuring tube 120 and the measuring tube support 121A from being damaged by vibration such as resonance. At this time, since both sides of the welded portion between the measurement tube 120 and the measurement tube support 121A are clamped, the load acting on the welded portion can be reduced.

  Further, in the clamping device 1A of the first embodiment, the coupling mechanism 4 is formed on the coupling shaft 71 that couples the first abutting member 40 and the first clamping mechanism 3A, and the first abutting member 40. And a long hole 40b for moving the clamp mechanism 3A along the outer peripheral surface 114a of the diffuser 114A. Accordingly, by allowing the first clamp mechanism 3A to move along the outer peripheral surface 114a of the diffuser 114A, even if the position of the measurement tube support 121A is displaced, the measurement tube 120 is appropriately clamped accordingly. It becomes possible to do.

(Second Embodiment)
16 is an overall perspective view showing the clamping device according to the second embodiment, FIG. 17 is a perspective view when the clamping device according to the second embodiment is viewed from another direction, and FIG. 18 is a clamping device according to the second embodiment. FIG. 19 is a side view showing a clamp device according to the second embodiment, FIG. 20 is a perspective view showing an arm, and FIG. 21 is an enlarged perspective view of a portion C in FIG. In addition, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  As shown in FIG. 16, the clamping device 1B includes a fixing base mechanism 2B (first base member 10, second base member 20, first wedge member 30, first contact member 40A and second contact member 50). And the second clamp mechanism 3B. The first contact member 40A has a configuration in which the long hole 40b is not formed in the first contact member 40 of the first embodiment.

  The second clamp mechanism 3B includes an arm 80, a pressing member 81, a retaining member 82, and a third wedge member 83.

  As shown in FIG. 17, the arm 80 has a substantially quadrangular prism shape, and the base end is rotatably connected to the upper surface of the first base member 10. In the present embodiment, the rotation shaft of the first abutting member 40 </ b> A that is rotatably connected to the first base member 10 and the rotation shaft of the arm 80 are configured coaxially. As a result, the arm 80, the first base member 10, and the first contact member 40 can be rotatably connected by a single connection pin P1 (see FIG. 20), so that the configuration of the clamp device 1B can be configured. It can be simplified. In addition, you may comprise the connection pin which connects the 1st base member 10 and the arm 80, and the connection pin which connects the 1st base member 10 and the 1st contact member 40 by another component. Further, the shape of the arm 80 is not limited to a substantially quadrangular prism shape.

  As shown in FIG. 18, a concave slide groove 80b is formed on the side surface 80a of the arm 80 from the substantially longitudinal center to the tip. The slide groove 80b is formed in a mountain shape whose shape when viewed from the slide direction is widened from the surface side to the bottom side, so that the pressing member 81 and the retaining member 82 are removed from the slide groove 80b. It is configured to prevent it.

  As shown in FIGS. 19 and 20, the arm 80 extends linearly in a direction substantially along one end of the first contact member 40. The base end portion of the arm 80 is disposed on the upper surface of the first base member 10 at a position where it does not come into contact with the first wedge member 30 even if the arm 80 is rotated. Can be set widely.

  The pressing member 81 is slidably attached to the slide groove 80 b and is positioned on the distal end side of the arm 80. Further, the pressing member 81 has a substantially square shape in a plan view of FIG. 19, and a holding surface 81 a that contacts the measuring tube 120 is formed. Further, a tapered surface 81 b is formed at the tip corner of the pressing member 81.

  The retaining member 82 is slidably attached to the slide groove 80 b and is located on the proximal end side of the pressing member 81. Further, the retaining member 82 has a substantially square shape in a plan view of FIG. 19, and is formed with a holding surface 82 a that contacts the measuring tube 120.

  The third wedge member 83 is attached to the retaining member 82 via a tightening bolt B4, and has a substantially L shape in a plan view of FIG. Further, the third wedge member 83 extends from the retaining member 82 toward the pressing member 81, and further extends toward the arm 80 at the tip of the pressing member 81. Further, the third wedge member 83 is formed with a tapered surface 83a in contact with the tapered surface 81b.

  As shown in FIG. 21, the third wedge member 83 is rotatably connected to the retaining member 82 via a tightening bolt B4. Therefore, before the measurement tube 120 is clamped, as shown by a two-dot chain line, as shown in FIG. By rotating to the position of the third wedge member 83, the measurement tube 120 can be inserted through the gap between the pressing member 81 and the retaining member 82.

  In the second clamp mechanism 3B configured as described above, after the measuring tube 120 is inserted between the pressing member 81 and the retaining member 82, the tightening bolt B4 is screwed into the retaining member 82 side, thereby the third wedge member 83. The taper surface 83a slides on the taper surface 81b of the pressing member 81, and the pressing member 81 moves to the retaining member 82 side.

  Next, a method for attaching the clamp device 1A according to the second embodiment will be described with reference to FIGS. FIG. 22 is a cross-sectional view illustrating the mounting state of the clamping device according to the second embodiment, and FIG. 23 is a top view illustrating the mounting state of the clamping device according to the second embodiment. In addition, in FIG. 23, illustration of the 1st base member 10 and the 1st wedge member 30 is abbreviate | omitted.

  By the way, the plurality of measurement tube supports 121B are formed at a lower end portion of the diffuser 114A, although the effect of suppressing the vibration of the measurement tube 120 is sufficiently exhibited because the interval between the adjacent measurement tube supports 121B is formed short. Since the distance L (see FIG. 26) between the measurement tube support 121A and the measurement tube support 121B at the lowermost end of the plurality of measurement tube supports 121B fixed to the diffuser 114B is long, it is more susceptible to vibrations. The measurement tube 120 is more likely to shake. Therefore, by applying the clamp device 1B, the fixing pedestal mechanism 2B is disposed at the lower end (narrow portion S1) of the diffuser 114A, and the measurement tube 120 is clamped by the second clamp mechanism 3B. This is to reduce the vibration in the case.

  As shown in FIG. 22, the clamp device 1 </ b> B is carried so as to be positioned in a gap (narrow portion S <b> 1) between the shroud 105 and the diffuser 114 </ b> A. When the clamping device 1B is arranged in the narrow portion S1, the first wedge member 30 is raised with respect to the fixing base mechanism 2B, and the first base member 10 and the second base member 20 are brought close to each other. Leave it in the state. Thereby, similarly to 1st Embodiment, the maximum width of 40 A of 1st contact members and the 2nd contact member 50 can be set to the minimum. Therefore, the clamping device 1B can be disposed in the narrow portion S1 between the diffuser 114A and the shroud 105. Further, as shown in FIG. 16, the second clamp mechanism 3B can be accommodated within the maximum width, so that the clamp device 1B can be carried to the narrow portion S1.

  After the clamp device 1B is carried to the narrow portion S1, the measurement tube 120 positioned between the measurement tube support 121A and the measurement tube support 121B is clamped by the second clamp mechanism 3B. As in the first embodiment, the first abutting member 40A and the second abutting member 50 are stretched between the diffuser 114A and the shroud 105 by screwing the tightening bolt B1 (see FIG. 1). Held in a state.

  Further, as shown in FIG. 23, the first contact member 40A is supported by the first base member 10 (see FIG. 22) so as to be rotatable in the W1 direction, so that the curved surface of the outer peripheral surface 114a of the diffuser 114A. Can be abutted along. Further, the second contact member 50 is also supported by the second pedestal member 20 so as to be rotatable in the W2 direction, so that it can be brought into contact with the outer peripheral surface 105a of the shroud 105 at an appropriate angle. Thereby, the clamp apparatus 1B can be held more reliably.

  As described above, according to the clamping device 1B according to the second embodiment, the first pedestal member 10, the second pedestal member 20, and the first wedge member are disposed between the diffuser 114A and the shroud 105 (the narrow portion S1). 30 and the second clamp mechanism 3B is disposed above the first pedestal member 10 in a direction substantially along the first abutting member 40A (see FIG. 22), so that the fixing pedestal mechanism 2B (first The width dimension of the base member 10, the second base member 20, the first wedge member 30, the first contact member 40A and the second contact member 50) and the second clamp mechanism 3B can be set narrow. Accordingly, the maximum width of the diffuser 114A can be narrowed, and the measurement tube 120 positioned between the measurement tube support 121A and the measurement tube support 121B disposed in the narrow portion S1 at the lower end of the diffuser 114A is clamped. It becomes possible to do. As a result, the vibration of the measurement tube 120 due to vibrations such as resonance can be reduced, so that the welded portion between the measurement tube 120 and the measurement tube support 121A can be prevented from being damaged.

  In the second embodiment, the arm 80 is provided with a slide groove 80b, and the holding member 82 that slides inside the slide groove 80b and the slide member 80 that slides inside the slide groove 80b and holds the measurement tube 120 therebetween are held. And a third wedge member 83 that is movably held on the retaining member 82 via the tightening bolt B4 and that presses the pressing member 81 toward the retaining member 82 by screwing the tightening bolt B4. ing. According to this, even if the position of the measurement tube 120 is shifted by allowing the arm 80 to move to the shroud 105 side and the diffuser 114A side, the measurement tube 120 is clamped at an appropriate position accordingly. It becomes possible to do.

(Third embodiment)
FIG. 24 is a plan view showing a coupling mechanism of the clamp device according to the third embodiment. In addition, 1 C of clamp apparatuses which concern on 3rd Embodiment deform | transform the connection mechanism 4 of 1 A of clamp apparatuses of 1st Embodiment. Moreover, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  As shown in FIG. 24, an internal gear 73 is formed in an arc shape in the long hole 40 b of the first contact member 40. The connecting shaft 71 is formed with an external gear 74 that meshes with the internal gear 73.

  According to the third embodiment, it is possible to easily move the first clamp mechanism 3A by rotating the connecting shaft 71.

  Note that the present invention is not limited to the above-described embodiments, and for example, a plurality of the first to third embodiments may be combined. For example, the structure which provides both the 1st clamp mechanism 3A and the 2nd clamp mechanism 3B in 2 A of fixing base mechanisms may be sufficient. As a result, the measuring tube 120 can be clamped at two locations with one fixing base mechanism 2A.

  Further, in each of the above-described embodiments, the description has been given by taking the example in which the second pedestal member 20 is moved in the direction away from the first pedestal member 10 using the wedge-shaped first wedge member 30. A configuration may be used in which the rotational motion of the tightening bolt is switched to the linear motion of the second pedestal member 20.

1A, 1B, 1C Clamp device 2A, 2B Fixing base mechanism 3A First clamp mechanism (clamp mechanism)
3B Second clamp mechanism (clamp mechanism)
4 coupling mechanism 10 first pedestal member 20 second pedestal member 30 first wedge member (first pressing member)
40, 40A First contact member 40b Long hole 50 Second contact member 71 Connection shaft 73 Internal gear 74 External gear 80 Arm 80b Slide groove (groove)
81 Pressing member (second slide member)
82 Locking member (first slide member)
83 Third wedge member (second pressing member)
101 Reactor pressure vessel 102 Jet pump 105 Shroud 114A, 114B Diffuser 121A, 121B Measuring tube support (support)

Claims (5)

In a jet pump measurement piping clamping device that clamps a flow rate measurement pipe attached via a support to a jet pump diffuser installed in a reactor pressure vessel,
A first pedestal member disposed between the diffuser and the shroud;
A second pedestal member disposed between the first pedestal member and the shroud and slidably attached to the first pedestal member;
A first abutting member that is rotatably supported below the first pedestal member and abuts against an outer peripheral surface of the diffuser;
A second abutting member that is rotatably supported below the second pedestal member and abuts against an outer peripheral surface of the shroud;
A first pressing member that is movably attached to the first pedestal member via a tightening bolt, and that moves the second contact member away from the first contact member by screwing the tightening bolt;
A clamping mechanism for clamping the measuring tube;
A coupling mechanism that couples the first contact member and the clamp mechanism ;
The clamp device for a jet pump measurement pipe , wherein the clamp mechanism is provided below the first contact member . The coupling mechanism is
A connecting shaft for connecting the first contact member and the clamp mechanism;
An elongated hole formed in the first abutting member and supported by the connecting shaft, and capable of moving the clamp mechanism along an outer peripheral surface of the diffuser;
The jet pump measurement pipe clamping device according to claim 1 , comprising: The inner surface of the elongated hole includes an internal gear,
The jet pump measurement piping clamping apparatus according to claim 2 , wherein the connecting shaft has an external gear that meshes with the internal gear. In a jet pump measurement piping clamping device that clamps a flow rate measurement pipe attached via a support to a jet pump diffuser installed in a reactor pressure vessel,
A first pedestal member disposed between the diffuser and the shroud;
A second pedestal member disposed between the first pedestal member and the shroud and slidably attached to the first pedestal member;
A first abutting member that is rotatably supported below the first pedestal member and abuts against an outer peripheral surface of the diffuser;
A second abutting member that is rotatably supported below the second pedestal member and abuts against an outer peripheral surface of the shroud;
A first pressing member that is movably attached to the first pedestal member via a tightening bolt, and that moves the second contact member away from the first contact member by screwing the tightening bolt;
And a clamping mechanism for clamping the measuring tube,
The clamp mechanism for a jet pump measurement pipe, wherein the clamp mechanism includes a base end rotatably connected to the first pedestal member, and a tip end that clamps the measurement pipe . A first slide member that slides relative to the arm;
A second slide member that slides relative to the arm and holds the measurement tube with the first slide member;
A second pressing member that is movably held on the first slide member via a tightening bolt and presses the second slide member toward the first slide member by screwing the tightening bolt;
The jet pump measurement pipe clamping device according to claim 4 , comprising:

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