JP2009115632A - Ultrasonic flowmeter sensor head, ultrasonic flowmeter sensor head device equipped with the same, and its positioning method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultrasonic flowmeter sensor head or the like having a structure capable of stabilizing pressing force of the ultrasonic flowmeter sensor head, and so on. <P>SOLUTION: The ultrasonic flowmeter sensor head 11 is so structured that, when a bellows cylinder 54 is not extended, a solid couplant 53 is pressed to the external peripheral surface of an inner pipe by a spring force due to extension of a coned disc spring device 42, together with a sensor bracket 43 and a sensor unit 45, and a reactive force of this pressing force is supported by a support frame 31 via the sensor head body 40, and that, when a pressurized gas is supplied to the bellows cylinder 54 and the bellows cylinder 54 is extended in a direction perpendicular to the pressing direction, the pressing of the sensor unit 45 to the external peripheral surface of the inner pipe by the spring device 42 is released, since the sensor bracket 43 moves together with a wedge roller 48 in a direction to the opposite side to the external peripheral surface of the inner pipe to contract the spring device 42, as a wedge plate 46 moves in the perpendicular direction and the wedge roller 48 is pressed to the wedge plane 46f. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an ultrasonic flowmeter sensor head installed on the outer peripheral surface of the pipe in order to measure the flow rate of a fluid flowing in the pipe, an ultrasonic flowmeter sensor head apparatus including the ultrasonic flowmeter sensor head, and a positioning method thereof.

  Conventionally, in a fast breeder reactor (sodium-cooled reactor) that uses liquid sodium as a coolant, an electromagnetic flow meter has been adopted as a flow meter for a safety protection flow measurement system, and this electromagnetic flow meter flows through the primary cooling system piping. The flow rate of the coolant (sodium) was measured.

Japanese Unexamined Patent Publication No. 2006-53082 (This patent document discloses a core flow rate measuring device that measures the core flow rate by an ultrasonic signal while reducing the influence of the disturbance of the flow field upstream of the Dynekama)

  However, in fast breeder reactors (sodium-cooled reactors) that are currently being considered as practical reactors, high-chromium steel is to be adopted for the primary cooling system piping, and since this high-chromium steel is a magnetic material, A conventional electromagnetic flow meter cannot be used for measuring the flow rate of the primary cooling system piping. Moreover, the primary cooling system pipe is a large-diameter pipe having a short straight pipe portion and a double pipe structure.

  Therefore, a safety protection flow measurement system that is currently applied to large-diameter pipes with a short straight pipe section and a high-chromium steel double pipe structure, which is currently being studied with the concept of practical application of such a fast breeder reactor (sodium-cooled reactor). The adoption of an ultrasonic propagation time difference / multi-sided flow meter system is being considered as a flow meter system suitable for the above. Also, the vicinity of the primary cooling system piping is a high temperature atmosphere because the liquid sodium in the primary cooling system piping is about 200 ° C. even when the reactor is shut down, and because the radioactivity is high, people approach. I can't. For this reason, a mechanism capable of exchanging the ultrasonic flowmeter sensor head device by remote control has been developed.

  And, in relation to the development of this ultrasonic propagation time difference / multi-sideline flow measurement system and remote exchange mechanism, there were several problems to be solved regarding the ultrasonic flowmeter sensor head applied to this system. .

(1) Structure for stabilizing the pressing force of the ultrasonic flowmeter sensor head (2) Arrangement of the ultrasonic flowmeter sensor head in a limited space (insertion arrangement of the ultrasonic flowmeter sensor head in a finite space)
(3) Repeatability of pressing position of ultrasonic flowmeter sensor head by remote control (deviation correction structure and insertion procedure of uniform arrangement on the circumference)
(4) Absorption structure of thermal expansion of ultrasonic flowmeter sensor head with temperature change (5) Verticalization of pressing angle of ultrasonic flowmeter sensor head (target pipe normal direction pressing)

  Accordingly, an object of the present invention is to provide an ultrasonic flowmeter sensor head, an ultrasonic flowmeter sensor head apparatus including the ultrasonic flowmeter sensor head, and a positioning method thereof.

The ultrasonic flowmeter sensor head of the first invention that achieves the above object is an ultrasonic flowmeter sensor head installed on the outer peripheral surface of the pipe in order to measure the flow rate of the fluid flowing in the pipe,
Disposed between a support frame fixed to the pipe outer peripheral surface and the pipe outer peripheral surface;
A sensor head body located on the support frame side;
A sensor bracket located on the outer peripheral surface of the pipe;
A sensor unit fixed to the sensor bracket;
A solid plant affixed to the sensor unit;
An elastic member interposed between the sensor head body and the sensor bracket;
It has an end face that faces the end face of the sensor head main body, and a side face that faces the side face of the sensor head main body, and on this side face, the inner surface on the pipe outer peripheral surface side and closer to the side opposite to the end face, A wedge plate provided with a wedge hole that is a wedge surface inclined in a direction opposite to the pipe outer peripheral surface as it goes in the direction opposite to the end surface;
A wedge roller attached to the sensor bracket and located in the wedge hole;
A bellows cylinder interposed between an end surface of the sensor head body and an end surface of the wedge plate;
When the bellows cylinder is not extended, the solid force plant is pressed against the outer peripheral surface of the pipe together with the sensor bracket and the sensor portion by a spring force generated by the extension of the elastic member, and a reaction force of the pressing force is While supported by the support frame via the sensor head body,
When pressurized gas is supplied to the bellows cylinder and the bellows cylinder extends in a direction perpendicular to the pressing direction, the wedge plate moves in the orthogonal direction and the wedge roller is pushed against the wedge surface. As a result, the sensor bracket moves together with the wedge roller in a direction opposite to the outer peripheral surface of the pipe, and the elastic member contracts, so that the pressing of the sensor portion to the outer peripheral surface of the pipe by the elastic member is released. It is characterized by having a configuration.

Further, the ultrasonic flowmeter sensor head of the second invention is the ultrasonic flowmeter sensor head of the first invention,
The elastic member is a disc spring device in which a plurality of disc springs are stacked.

Further, according to the ultrasonic flowmeter sensor head of the third invention, in the ultrasonic flowmeter sensor head of the first or second invention,
A horizontal guide hole is provided on the side surface of the wedge plate,
A plurality of horizontal guide rollers attached to the sensor head body and positioned in the horizontal guide hole;
The wedge plate is guided by the horizontal guide hole and the horizontal guide roller so that the wedge plate moves in the orthogonal direction.

The ultrasonic flowmeter sensor head of the fourth invention is the ultrasonic flowmeter sensor head of any of the first to third inventions,
A gap is provided between the sensor head main body and the sensor bracket and between the sensor bracket and the elastic member.

The ultrasonic flowmeter sensor head of the fifth invention is the ultrasonic flowmeter sensor head of any of the first to fourth inventions,
The guide roller provided in the sensor head body moves along the guide rail by rolling by engaging with the guide rail fixed to the pipe outer peripheral surface along the circumferential direction of the pipe outer peripheral surface. It is characterized by having a configuration capable of.

  The ultrasonic flowmeter sensor head device of the sixth invention is characterized in that a plurality of ultrasonic flowmeter sensor heads of the fifth invention are connected by a connecting rod.

The ultrasonic flowmeter sensor head device of the seventh invention is the ultrasonic flowmeter sensor head device of the sixth invention,
The head side connecting portion of the sensor head body and the rod side connecting portion of the connecting rod have a connecting shaft fixed to the head side connecting portion that is long in the axial direction of the connecting rod formed in the rod side connecting portion. It is connected by being inserted through the long hole.

Moreover, the ultrasonic flowmeter sensor head device of the eighth invention is the ultrasonic flowmeter sensor head device of the seventh invention,
The connecting shaft is located outside the elongated hole when the sensor is pressed.

The ultrasonic flowmeter sensor head device positioning method of the ninth invention is a positioning method of the ultrasonic flowmeter sensor head device of the seventh invention,
The plurality of ultrasonic flowmeter sensor heads are moved along the guide rail, and a contact portion of a head ultrasonic flowmeter sensor head among the plurality of ultrasonic flowmeter sensor heads is disposed on the outer peripheral surface of the pipe. A first procedure in which the connecting shaft is brought into contact with the inside of the elongated hole by contacting the fixed stopper;
A second procedure in which pressurized gas is discharged from the bellows cylinder of the head ultrasonic flowmeter sensor head, and only the head ultrasonic flowmeter sensor head is pressed against the pipe outer peripheral surface by the elastic member;
Pulling another ultrasonic flowmeter sensor head connected behind the head ultrasonic flowmeter sensor head in a direction opposite to the moving direction of the ultrasonic flowmeter sensor head in the first procedure, A third procedure for bringing the connecting shaft into contact with the outside of the slot by returning the length of the slot;
A fourth procedure in which pressurized gas is discharged from the bellows cylinder of the other ultrasonic flowmeter sensor head, and the other ultrasonic flowmeter sensor head is pressed against the pipe outer peripheral surface by the elastic member;
It is characterized by having.

  According to the ultrasonic flowmeter sensor head of the first invention, an ultrasonic flowmeter sensor head installed on the outer peripheral surface of the pipe in order to measure the flow rate of the fluid flowing in the pipe, A sensor head body disposed between the fixed support frame and the pipe outer peripheral surface and positioned on the support frame side, a sensor bracket positioned on the pipe outer peripheral surface side, and a sensor fixed to the sensor bracket Part, a solid coplanar affixed to the sensor part, an elastic member interposed between the sensor head body and the sensor bracket, an end face facing the end face of the sensor head body, and the sensor head A side surface facing the side surface of the main body, and on this side surface, the inner surface on the pipe outer peripheral surface side and closer to the side opposite to the end surface is moved forward as it goes in the direction opposite to the end surface. A wedge plate provided with a wedge hole which is a wedge surface inclined in a direction opposite to the outer peripheral surface of the pipe, a wedge roller attached to the sensor bracket and positioned in the wedge hole, A bellows cylinder interposed between the end surface of the sensor head main body and the end surface of the wedge plate, and when the bellows cylinder is not extended, by the spring force due to the elastic member extending, The solid bracket is pressed against the outer peripheral surface of the pipe together with the sensor bracket and the sensor portion, and a reaction force of the pressing force is supported by the support frame via the sensor head body, while a pressurized gas is applied to the bellows cylinder. When the bellows cylinder extends in a direction perpendicular to the pressing direction, When the wedge plate moves in the orthogonal direction and the wedge roller is pushed by the wedge surface, the sensor bracket moves in the direction opposite to the outer peripheral surface of the pipe together with the wedge roller, and the elastic member contracts. Therefore, since the pressing of the sensor unit to the outer peripheral surface of the pipe by the elastic member is released, the pressing of the sensor unit to the outer peripheral surface of the pipe by the elastic member and the release of the pressing are performed. Therefore, it is possible to realize a structure for stabilizing the pressing force of the ultrasonic flowmeter sensor head.

  According to the ultrasonic flowmeter sensor head of the second invention, in the ultrasonic flowmeter sensor head of the first invention, the elastic member is a disc spring device in which a plurality of disc springs are stacked. A sufficient spring force can be obtained even in a small size compared to a coil spring or the like.

  According to the ultrasonic flowmeter sensor head of the third invention, in the ultrasonic flowmeter sensor head of the first or second invention, a horizontal guide hole is provided in the side surface of the wedge plate and attached to the sensor head body. And a plurality of horizontal guide rollers positioned in the horizontal guide hole, and the wedge plate is moved by the horizontal guide hole and the horizontal guide roller so that the wedge plate moves in the orthogonal direction. Since the structure is such that it is guided, the elastic member can be reliably contracted by reliably moving the wedge plate in the orthogonal direction by the guide of the horizontal guide hole and the horizontal guide roller.

  According to the ultrasonic flowmeter sensor head of the fourth invention, in the ultrasonic flowmeter sensor head of any of the first to third inventions, between the sensor head body and the sensor bracket, and the sensor bracket When the ultrasonic flowmeter sensor head is tilted by its own weight when pressing the sensor portion against the outer peripheral surface of the pipe by the elastic member, the sensor portion is It can be pressed perpendicularly to the tangential direction of the contact point between the pipe and the sensor part (see FIG. 10: details will be described later).

  According to the ultrasonic flowmeter sensor head of the fifth invention, in any one of the ultrasonic flowmeter sensor heads of the first to fourth inventions, the guide roller provided in the sensor head main body has a circumference on the outer peripheral surface of the pipe. The ultrasonic flowmeter sensor is characterized in that it can move along the guide rail by engaging and rolling with the guide rail fixed to the outer peripheral surface of the pipe along the direction. By moving the head along the guide rail with a guide roller, the head can be easily disposed at any position in the circumferential direction of the pipe outer peripheral surface.

  According to the ultrasonic flowmeter sensor head device of the sixth invention, a plurality of ultrasonic flowmeter sensor heads of the fifth invention are connected by connecting rods. Sonic flowmeter sensor heads can be arranged (insertion arrangement of ultrasonic flowmeter sensor heads in a finite space), especially between the inner and outer pipes in the primary cooling system piping of a fast breeder reactor (sodium-cooled reactor) It is possible to install it in the space of the inner pipe and install it on the outer peripheral surface of the inner tube.

  According to the ultrasonic flowmeter sensor head device of the seventh invention, in the ultrasonic flowmeter sensor head device of the sixth invention, the head side connecting portion of the sensor head body and the rod side connecting portion of the connecting rod are Since the connecting shaft fixed to the head side connecting portion is connected by being inserted into a long hole extending in the axial direction of the connecting rod formed in the rod side connecting portion. It is possible to absorb the thermal displacement of each part such as the flowmeter sensor head through the long hole.

  Particularly, according to the ultrasonic flowmeter sensor head device of the eighth invention, in the ultrasonic flowmeter sensor head device of the seventh invention, the connecting shaft is located outside the elongated hole. Even if the connecting rod and the sensor head main body are thermally expanded due to the temperature rise of the fluid, etc., the connecting shaft moves inward in the elongated hole, so that the thermal elongation can be absorbed by the elongated hole. In addition, it is possible to prevent occurrence of displacement of the compressive load and the ultrasonic flowmeter sensor head.

  Further, according to the positioning method of the ultrasonic flowmeter sensor head device of the ninth invention, the positioning method of the ultrasonic flowmeter sensor head device of the seventh invention, wherein the plurality of ultrasonic flowmeter sensor heads are guided by the guide. The connecting shaft is moved along the rail, and a contact portion of a head ultrasonic flowmeter sensor head of the plurality of ultrasonic flowmeter sensor heads is brought into contact with a stopper fixed to the outer peripheral surface of the pipe. A first step of contacting the inside of the elongated hole and the bellows cylinder of the head ultrasonic flowmeter sensor head to discharge pressurized gas, and only the head ultrasonic flowmeter sensor head A second procedure of pressing the outer peripheral surface of the pipe with an elastic member, and another ultrasonic flowmeter sensor head connected behind the head ultrasonic flowmeter sensor head in the first procedure. A third step of bringing the connecting shaft into contact with the outside of the elongated hole by pulling in the direction opposite to the moving direction of the ultrasonic flowmeter sensor head and returning the length of the elongated hole; A pressure gas is discharged from the bellows cylinder of the ultrasonic flowmeter sensor head, and the other ultrasonic flowmeter sensor head is pressed against the outer peripheral surface of the pipe by the elastic member. Therefore, the connecting shaft can be easily and reliably positioned outside the elongated hole. For this reason, even if the connecting rod and the sensor head main body are thermally expanded due to the same effect as the seventh invention, that is, due to the temperature rise of the fluid, the connecting shaft moves inwardly in the elongated hole, Since the thermal elongation can be absorbed by the long hole, it is possible to surely obtain the effect that the occurrence of the compressive load and the displacement of the ultrasonic flowmeter sensor head can be prevented.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

<Configuration>
First, based on FIGS. 1 to 3, an outline of an ultrasonic flowmeter sensor head device according to an embodiment of the present invention, and a fast breeder reactor (sodium-cooled reactor) to which the ultrasonic flowmeter sensor head device is applied. The outline of will be described.

  FIG. 1 is a transverse sectional view of a fast breeder reactor (sodium-cooled reactor) to which an ultrasonic flowmeter sensor head device according to an embodiment of the present invention is applied, and FIG. 2 is a longitudinal section of the fast breeder reactor (sodium-cooled reactor). FIG. FIG. 3 is a schematic view of the ultrasonic flowmeter sensor head device.

  The fast breeder reactor (sodium-cooled reactor) shown in FIGS. 1 and 2 is currently being studied as a practical reactor, and two primary cooling systems are provided on the left and right sides of the reactor vessel 1. In any primary cooling system, two low temperature side pipes 3 and one high temperature side pipe 4 as primary cooling system pipes are interposed between the reactor vessel 1 and the intermediate heat exchanger 2, respectively. ing.

  The liquid sodium flowing out from the intermediate heat exchanger 2 and flowing into the reactor vessel 1 through the low temperature side pipe 3 cools the core 5 and becomes high temperature, and then becomes intermediate heat again through the high temperature side pipe 4. It flows into the exchanger 2. Such circulation of liquid sodium is performed by a primary cooling system pump 6 incorporated in the intermediate heat exchanger 2. Although not shown, the intermediate heat exchanger 2 performs heat exchange between the primary cooling system liquid sodium and the secondary cooling system liquid sodium, and the secondary cooling system steam generator further converts the secondary cooling system. Heat is exchanged between liquid sodium and water to generate steam, and the steam is driven together with the steam turbine by this steam to generate power.

  And in order to measure the flow volume of the liquid sodium which flows through each low temperature side piping 3 (inner tube 3B) in the straight pipe part 3A of each low temperature side piping 3 of this fast breeder reactor, the ultrasonic wave of this embodiment example A flow meter sensor head device 7 is provided. The low temperature side pipe 3 is a large-diameter pipe having a high chromium steel double pipe structure (inner pipe 3B, outer pipe 3C) with a short straight pipe portion 3A. The high temperature side pipe 4 is also a large diameter pipe having a high chromium steel double pipe structure.

  As shown in FIG. 3, in order to constitute an ultrasonic propagation time difference / multi-side line type flow rate measurement system, an ultrasonic flowmeter sensor head device 7 is connected to Ich and IIch in the straight pipe portion 3A of each low temperature side pipe 3. Two channels are installed. The ultrasonic flowmeter sensor head device 7 of each channel has a maximum of eight ultrasonic flowmeter sensor heads 11 on one side and the other side in the axial direction of the low temperature side pipe 3.

  In the ultrasonic flowmeter sensor head device 7 on one side of the Ich, the eight ultrasonic flowmeter sensor heads 11 are arranged on the outer peripheral surface (hereinafter simply referred to as “inner pipe outer periphery”) of the inner pipe 3B of the low temperature side pipe 3 (straight pipe portion 3A). Are also arranged at equal intervals in the circumferential direction (that is, evenly arranged on the circumference), and the ultrasonic flowmeter sensor head device 7 on the other side of the Ich also has eight ultrasonic flowmeter sensors corresponding thereto. The head 11 is arranged on the outer peripheral surface of the inner pipe of the low temperature side pipe 3 (straight pipe portion 3A) at equal intervals in the circumferential direction (that is, evenly arranged on the circumference), so that the arrangement of the X method (as shown in the drawing) The arrangement is such that two ultrasonic survey lines are X-shaped in one plane passing through the heart). Similarly, in the ultrasonic flowmeter sensor head device 7 on one side of the IIch, eight ultrasonic flowmeter sensor heads 11 are equally spaced in the circumferential direction on the outer peripheral surface of the inner pipe of the low temperature side pipe 3 (straight pipe portion 3A). Corresponding to this, in the ultrasonic flowmeter sensor head device 7 on the other side of IIch, eight ultrasonic flowmeter sensor heads 11 are connected to the low temperature side pipe 3 (straight pipe portion 3A). ) Is arranged on the outer peripheral surface of the inner tube at equal intervals in the circumferential direction (that is, evenly arranged on the circumference), so that the X method is arranged.

  In addition, although it is possible to measure the flow rate by installing the ultrasonic flowmeter sensor head device 7 for one channel, it is safe to install the ultrasonic flowmeter sensor head device 7 for a plurality of channels as described above. This is a requirement of the flow measurement system.

  Next, the configuration of the ultrasonic flowmeter sensor head device 7 will be described in detail with reference to FIG. FIG. 4 is a side view showing a configuration of one ultrasonic flowmeter sensor head device (one side of one channel).

  As shown in FIG. 4, the ultrasonic flowmeter sensor head device 7 has a configuration in which eight ultrasonic flowmeter sensor heads 11 are connected by a connecting rod 12. These ultrasonic flowmeter sensor heads 11 are arranged on the outer peripheral surface of the inner tube 3B as indicated by an arrow A along a guide rail 13 (represented by an alternate long and short dash line in FIG. 4) fixed to the outer peripheral surface of the inner tube 3B. By moving upward in the circumferential direction, it is inserted into the space between the inner tube 3B and the outer tube 3C of the low temperature side pipe 3, and is fixed to the outer peripheral surface of the inner tube 3B.

  Although details will be described later, the head ultrasonic flowmeter sensor head 11 among the eight ultrasonic flowmeter sensor heads 11 has a contact portion 14 provided at the front end thereof fixed to the outer peripheral surface of the inner tube 3B. It is pressed against the outer peripheral surface of the inner tube 3 </ b> B while being in contact with the stopper 15. The other ultrasonic flowmeter sensor head devices 11 were also positioned so that the eight ultrasonic flowmeter sensor heads 11 including the leading ultrasonic flowmeter sensor head 11 were equally spaced (equally arranged on the circumference). In this state, it is pressed against the outer peripheral surface of the inner tube 3B. In this state, the ultrasonic flowmeter sensor head device 7 measures the flow rate of liquid sodium flowing in the inner tube 3B.

  A guide tube 17 is coupled to the outer tube 3C. The guide tube 17 extends upward and penetrates the floor 18 in the reactor building located above the low temperature side pipe 3. A first extension guide rail 19 is coupled to the rear end of the guide rail 13 fixed to the inner tube 3B, and a second extension guide rail 20 is coupled to the first extension guide rail 19. The first extension guide rail 19 extends to the lower end of the guide tube 17, and the second extension guide rail 20 is fixed in the guide tube 17 and extends upward.

  In addition, a first extension rod 16 is connected to the rear end portion of the last ultrasonic flow meter sensor head 11 among the eight ultrasonic flow meter sensor heads 11. The second extension rod 27 is connected. The first extension rod 16 extends to the lower end of the guide tube 17, and the second extension rod 27 extends upward in the guide tube 17. A lid member 21 is attached to the upper end of the second extension rod 27. Normally, the lid member 21 closes the upper end portion of the guide tube 17 with the lid member 21 so as to be enclosed in a space between the inner tube 3B and the outer tube 3C. Nitrogen is prevented from leaking from the guide tube 17.

  When performing maintenance at a cycle of about two years, a temporary insertion / extraction device 22 is installed on the floor 18 as an insertion / extraction means of the ultrasonic flowmeter sensor head device 7 as shown in the figure. The insertion / extraction device 22 includes a motor-driven winding device 24 provided at the upper end of the pedestal 23, a bush chain 25 coupled to the winding device 24, and a hook (hanging tool) 26 attached to the bush chain 25. It is what has. Therefore, when the bush 26 is wound up by the winding device 24 after the hook 26 is hooked on the lid member 21, the ultrasonic flowmeter sensor head device 7 is lifted upward together with the lid member 21. As shown by the alternate long and short dash line in FIG. At this time, each ultrasonic flowmeter sensor head 11 of the ultrasonic flowmeter sensor head device 7 moves along the guide rails 13, 19, and 20.

  On the other hand, for example, when a new ultrasonic flowmeter sensor head device 7 is replaced, the ultrasonic flowmeter sensor head device 7 is suspended by hooking the lid member 21 on the hook 26 as shown by a one-dot chain line in FIG. After that, when the bush chain 25 is unwound by the winding device 24, the ultrasonic flowmeter sensor head device 7 moves between the inner tube 3B and the outer tube 3C of the low temperature side pipe 3 as shown by the solid line in FIG. It is inserted into the space and fixed to the outer peripheral surface of the inner tube 3B. Also at this time, each ultrasonic flowmeter sensor head 11 of the ultrasonic flowmeter sensor head device 7 moves along the guide rails 13, 19, and 20. 4, a third extension guide rail 28 is further coupled to the second extension guide rail 20 as indicated by a one-dot chain line, and the ultrasonic flowmeter sensor head along the third extension guide rail 28 on the floor 18. If 11 is moved, the movement of the ultrasonic flowmeter sensor head 11 is further stabilized.

  The insertion / extraction means of the ultrasonic flowmeter sensor head device 7 is not necessarily limited to the configuration of the insertion / extraction device 22, but the ultrasonic flowmeter sensor head device 7 (ultrasonic flowmeter sensor head 11). ) As long as it can be inserted and pulled out.

  Next, the configuration of the ultrasonic flowmeter sensor head 11 and the insertion procedure (positioning procedure) of the ultrasonic flowmeter sensor head device 7 will be described in detail with reference to FIGS. FIG. 5 is a side view of one ultrasonic flowmeter sensor head, FIG. 6 is a perspective view showing a part of the ultrasonic flowmeter sensor head, and FIG. 7 is a longitudinal sectional view of the ultrasonic flowmeter sensor head. FIG. 8 is a perspective view showing the ultrasonic flowmeter sensor head partly broken and disassembled. FIG. 9 is an explanatory diagram showing an insertion (positioning) procedure of the ultrasonic flowmeter sensor head device.

  As shown in FIGS. 5 to 8, two guide rails 13 are provided in parallel to one ultrasonic flowmeter sensor head device 7 and are fixed to the outer peripheral surface of the inner tube 3 </ b> B. A support frame 31 is fixed to the outer peripheral surface of the inner tube 3B. Eight support frames 31 corresponding to the eight ultrasonic flowmeter sensor heads 11 of the ultrasonic flowmeter sensor head device 7 are arranged at equal intervals in the circumferential direction on the outer peripheral surface of the inner tube 3B (equal arrangement on the circumference). Has been. Each support frame 31 is a gate-shaped member having a reaction force receiving portion 31 a and leg portions 31 b on both sides of the reaction force receiving portion 31 a, and the inner pipe in a state of straddling the two guide rails 13. It is fixed to the outer peripheral surface of 3B. The ultrasonic flowmeter sensor head 11 is inserted inside the support frame 31, supported by the support frame 31, and pressed against the outer peripheral surface of the inner tube 3 </ b> B.

  More specifically, the ultrasonic flowmeter sensor head 11 includes a sensor head main body 40, a reaction force pad 41, a disc spring device 42, a sensor bracket 43, a main body guide 44, a sensor unit (ultrasonic sensor probe) 45, and a wedge plate 46. A horizontal guide roller 47, a wedge roller 48, a guide roller 49, a guide shaft 50, a solid coplant 53, a bellows cylinder 54, and the like.

  The sensor head main body 40 is located on the support frame 31 (reaction force receiving portion 31a) side, and the sensor bracket 43 is located on the outer peripheral surface side of the inner tube. The sensor head main body 40 is hollow inside, and the outer peripheral surface side of the inner tube is open. The reaction force pad 41 is fixed to the end surface 40a of the sensor head body 40 (the surface opposite to the outer peripheral surface of the inner tube). The reaction force pad 41 may be integrated with the sensor head main body 40 or may not be provided. The main body guide 44 has an annular shape, is provided inside the sensor head main body 40, and is fixed to the sensor head main body 40. The sensor bracket 43 has a cylindrical hollow inside, and the side opposite to the outer peripheral surface of the inner tube is open. The sensor bracket 43 is provided inside the sensor head main body 40, and a cylindrical end 43 a formed on the side opposite to the outer peripheral surface of the inner tube is located inside the main body guide 44.

  The sensor unit 45 is fixed to an end surface of the sensor bracket 43 on the outer peripheral surface side of the inner tube, and a piezoelectric element 51 for oscillating or receiving ultrasonic waves and a shoe 52 are provided inside. The shoe 52 guides the ultrasonic wave generated by the piezoelectric element 51 to an incident angle suitable for the measurement target, or guides the ultrasonic wave propagated from the measurement target to the piezoelectric element 51. The supply of the electrical signal to the piezoelectric element 51 and the output of the electrical signal from the piezoelectric element 51 are performed via the electrical cable 56.

  The solid coplant 53 is affixed to the end surface of the sensor unit 45 (shoe 52) on the outer peripheral surface side of the inner tube. As the solid co-plant 53, a metal co-plant using a relatively soft metal is used. The solid coplant 53 increases the ultrasonic wave propagation efficiency between the sensor unit 45 and the inner tube 3B.

  The guide shaft 50 is inserted through a central through hole 42 a of the disc spring device 42, and an end portion on the opposite side to the outer peripheral surface of the inner tube is fixed to the sensor head body 40, while an end portion on the outer peripheral surface side of the inner tube is fixed. The sensor bracket 43 is inserted into an annular shaft guide 59 fixed to the hole 43b at the end of the inner pipe outer peripheral surface.

  The disc spring device 42 has a cylindrical shape in which a plurality of disc springs are stacked to obtain a predetermined stroke in the extending and contracting direction, and is interposed between the sensor head main body 40 and the sensor bracket 43. Specifically, the disc spring device 42 is provided inside the sensor head main body 40 and is inserted through the main body guide 44, and a portion on the outer peripheral surface side of the inner pipe is fitted inside the sensor bracket 43, while the inner pipe The part opposite to the outer peripheral surface is fitted in the fitting hole 40 b of the sensor head main body 40. The end of the disc spring device 42 on the outer peripheral surface side of the inner tube is fixed to the sensor bracket 43, while the end of the disc spring device 42 opposite to the outer peripheral surface of the inner tube is fixed to the sensor head body 40. .

  Accordingly, due to the spring force generated by the extension of the disc spring device 42b, the solid bracket 53 and the sensor bracket 45 are pushed toward the outer peripheral surface of the inner tube and pressed against the outer peripheral surface of the inner tube. The reaction force is supported by the support frame 31 via the sensor head body 40 (reaction force pad 41). For this reason, the solid capsule 53 pressed against the outer peripheral surface of the inner tube by the pressing force is deformed following the shape of the inner peripheral surface of the inner tube (for example, slight irregularities on the outer peripheral surface of the inner tube), thereby Close contact with. At this time, the guide shaft 50 guides the disc spring device 42 so as to prevent the disc spring device 42 from bending left and right and to extend straight.

  Although details will be described later, a gap 57 is secured between the disc spring device 42 and the sensor bracket 43 in order to realize the vertical pressing angle of the sensor unit 45, and the sensor bracket 43 (end portion 43a) and A gap 58 is also secured between the sensor head main body 40 (main body guide 44 in the illustrated example).

  The wedge plate 46 is a frame formed in a rectangular shape, and is provided so as to surround the sensor head main body 40. The bellows cylinder 54 is interposed between the sensor head main body 40 and the wedge plate 46. More specifically, the bellows cylinder 54 is interposed between the end surface 40c of the sensor head main body 4 and the end surface 46a of the wedge plate 46 opposite to the end surface 40c. They are arranged along the tangential direction at the contact point (hereinafter also referred to simply as “inner tube tangential direction”), and both ends are fixed to the end face 40c and the end face 46a, respectively. That is, the expansion / contraction direction of the bellows cylinder 54 is a direction orthogonal to the pressing direction of the sensor unit 45 by the disc spring device 42. Supply of pressurized gas (for example, pressurized nitrogen gas) to the bellows cylinder 54 and discharge of the pressurized gas from the bellows cylinder 54 are performed via a pressurized gas supply pipe 55.

  A plurality (two in the illustrated example) of horizontal guide rollers 47 are attached to both side surfaces 40d of the sensor head body 40 (surfaces in the axial direction of the inner tube 3B (hereinafter also simply referred to as “tube axis direction”)). ing. In any side surface 40d, the two horizontal guide rollers 47 are disposed along the inner tube tangential direction. One wedge roller 48 is attached to each side surface 43 c of the sensor bracket 43. In any side surface 43 c, the wedge roller 48 is located closer to the outer peripheral surface of the inner tube than the horizontal guide roller 47.

  On the other hand, on both side surfaces 46c (surfaces in the tube axis direction) of the wedge plate 46, horizontal guide holes 46d for two horizontal guide rollers corresponding to two horizontal guide rollers 47 and one wedge roller 48, respectively. A wedge hole 46e for one wedge roller is formed. The horizontal guide roller 47 is located in the horizontal guide hole 46d, and the wedge roller 48 is located in the wedge hole 46e. Each horizontal guide hole 46d is a long hole that is long in the inner pipe tangential direction. The horizontal guide hole 46d is not individually formed for each horizontal guide roller 47, but may be integrated. In the wedge hole 46e, the inner surface on the outer peripheral surface side of the inner tube and on the side opposite to the end surface 46a is a wedge surface 46f. The wedge surface 46f is an inclined surface that is inclined in the direction opposite to the outer peripheral surface of the inner tube as it goes in the direction opposite to the end surface 46a.

  Accordingly, when the pressurized gas sent from an external pressurized gas supply device through a gas supply pipe (not shown) is supplied from the pressurized gas supply pipe 55 to the bellows cylinder 54 and the bellows cylinder 54 is extended, this bellows. The wedge plate 46 pushed by the cylinder 54 is guided by the horizontal guide roller 47 and the horizontal guide hole 46d and moves in the tangential direction of the inner pipe. At this time, the wedge roller 48 comes into contact with the wedge surface 46f of the wedge hole 46e and is pushed by the wedge surface 46f. As a result, the sensor bracket 43 together with the wedge roller 48 moves in the direction opposite to the outer peripheral surface of the inner tube and contracts the disc spring device 42, so that the sensor unit 45 ( The pressing of the solid coplant 53) is released.

  Even if the bellows cylinder 54 is plastically deformed at the time of extension and it is difficult for the bellows cylinder 54 to return to its original state by itself, when the pressurized gas is discharged from the bellows cylinder 54, the spring force of the disc spring device 42 is changed to the sensor bracket 43. By acting on the bellows cylinder 54 via the wedge roller 48 and the wedge plate 46, the original state can be reliably restored.

  Four guide rollers 49 are attached to the front, rear, left and right of the sensor head body 40. These guide rollers 49 are located in a recess 13 a formed on the inner surface side of the guide rail 13. Therefore, the ultrasonic flowmeter sensor head 11 can move along the guide rail 13 when the guide roller 49 engages with the guide rail 13 and rolls. Note that there is a slight gap between the guide roller 49 and the guide rail 13 (recess 13a), and the ultrasonic flowmeter sensor head 11 (sensor unit 45) to the outer peripheral surface of the inner tube by the disc spring device 42 is provided. It will not interfere with the pressing.

  Although not shown, the other guide rails 19, 20, and 28 are also configured in the same manner as the guide rail 13, and the guide roller 49 is positioned in the concave portion on the inner surface side. For this reason, the ultrasonic flowmeter sensor head 11 may move along the guide rails 19, 20, 28 when the guide roller 49 is engaged with the guide rails 19, 20, 28 and rolls. it can.

  Further, head-side connecting portions 60 are provided on the front side and the rear side of the sensor head main body 40, respectively, and connecting shaft holes 60a are formed in these head-side connecting portions 60. On the other hand, elongated rod holes 12b in the axial direction of the connecting rod 12 are formed in the rod side connecting portions 12a on both axial sides of the connecting rod 12 as connecting shaft holes. The connecting shaft 61 is inserted through the connecting shaft hole 60a and the elongated hole 12a. Accordingly, the connecting shaft 61 is fixed to the connecting shaft hole 60a, while the long hole 12a can move in the axial direction of the connecting rod 12 by the length.

  Thus, as described above, the eight ultrasonic flowmeter sensor heads 11 are connected by the connecting rod 11 (see FIG. 4). However, as described above, on the front side of the leading ultrasonic flowmeter sensor head 11 among the eight ultrasonic flowmeter sensor heads 11, there is no connecting portion, and a contact portion 14 is provided. The first extension rod 16, not the connection rod 12, is connected to the head side connection portion 60 of the last ultrasonic flow meter sensor head 11 among the eight ultrasonic flow meter sensor heads 11.

  The ultrasonic flowmeter sensor head 11 and the connecting rod 12 are connected using the long hole 12 a because the compression load due to thermal expansion (thermal expansion) of the connecting rod 12 and the sensor head main body 40 or the ultrasonic flowmeter sensor head 11 is connected. This is to prevent the occurrence of displacement. However, simply inserting the ultrasonic flowmeter sensor head device 7 (ultrasonic flowmeter sensor head 11) will cause the connecting shaft 61 to be biased inside the elongated hole 12b. In order to prevent the occurrence of a compressive load due to thermal expansion, when the ultrasonic flowmeter sensor head device 7 is inserted (installed on the outer peripheral surface of the inner tube), the connecting shaft 61 needs to be positioned outside the elongated hole 12b. There is. For this reason, it is necessary to insert (position) the ultrasonic flowmeter sensor head device 7 by an insertion procedure (positioning procedure) as shown in FIG. This procedure will be described below. The following procedures 1 to 4 are performed by operating the insertion / extraction device 22 and the pressurized gas supply device at a position away from the primary cooling system pipe by the worker.

  Procedure 1: First, as shown in FIG. 9A, the eight ultrasonic flowmeter sensor heads 11 of the ultrasonic flowmeter sensor head device 11 are moved along the guide rail 13, and these eight ultrasonic flowmeters are moved. The contact portion 14 of the head ultrasonic flowmeter sensor head 11 in the sensor head 11 is brought into contact with the stopper 15. That is, pressurized gas is supplied to the bellows cylinder 54 and the disk spring device 42 is contracted, and the head is pushed in until the head ultrasonic flowmeter sensor head 11 contacts the stopper 15. At this time, an energization switch (contact point) 71 is attached to the contact portion 14 (attached to the stopper 15 so that the worker can reliably determine that the contact portion 14 has contacted the stopper 15. Also good). When the contact portion 14 contacts the stopper 15 and the energization switch (contact point) 71 is energized, the worker determines that the contact portion 14 has contacted the stopper 15 with certainty. At this time, as shown in FIG. 9B, in the rod side connecting portion 12a of each connecting rod 12, the connecting shaft 61 is in contact with the inside of the elongated hole 12b. In addition to the method of confirming the contact of the contact portion 14 using the energization switch 71, it is confirmed by confirming that the lid member 21 is securely inserted (attached) as shown in FIG. Can also be confirmed.

Step 2: In this state, the pressurized gas is discharged from the bellows cylinder 54 of the head ultrasonic flowmeter sensor head 11, and only the head ultrasonic flowmeter sensor head 11 is placed on the outer peripheral surface of the inner tube by the disc spring device 42. Press.
Procedure 3: Next, the seven ultrasonic flowmeter sensor heads 11 connected to the rear of the head ultrasonic flowmeter sensor head 11 are pulled out (the direction opposite to the moving direction of the ultrasonic flowmeter sensor head 11 in step 1). ) To return the length of the long hole 12b (move in the reverse direction). Thus, all ultrasonic flowmeter sensor heads 11 are positioned. That is, as shown in FIG. 9C, in the rod side connecting portion 12a of each connecting rod 12, the connecting shaft 61 is in contact with the outside in the long hole 12b.
Procedure 4: In this state, the seven ultrasonic flowmeter sensor heads 11 connected to the rear of the head ultrasonic flowmeter sensor head 11 also discharge the pressurized gas of the bellows cylinder 54, and the inner spring is operated by the disc spring device 42. Press against the outer surface.

  Accordingly, when the temperature of the liquid sodium flowing through the low temperature side pipe 3 is subsequently increased and the temperature of the liquid sodium is increased (for example, increased to 530 ° C. at the maximum), the connecting rod 12 and the sensor head body 40 are thermally expanded. However, as shown in FIG. 9 (d), in the rod side connecting portion 12a of each connecting rod 12, the connecting shaft 61 moves from the outside to the inside of the long hole 12b, so that the thermal elongation is absorbed. The

<Effect>
As described above, according to the ultrasonic flowmeter sensor head 11 of the present embodiment, the support frame 31 is disposed between the support frame 31 fixed to the outer peripheral surface of the inner tube and the outer peripheral surface of the inner tube. A sensor head body 40 positioned at the inner pipe, a sensor bracket 43 positioned on the outer peripheral surface side of the inner tube, a sensor portion 45 fixed to the sensor bracket 43, a solid coplanar 53 attached to the sensor portion 45, and a sensor head body. 40, a disc spring device 42 interposed between the sensor bracket 43, an end face 46a facing the end face 40c of the sensor head body 40, and a side face 46c facing the side face 40d of the sensor head body 40, On this side surface 46c, the inner surface on the outer peripheral surface side of the inner tube and closer to the side opposite to the end surface 46a is inclined in the direction opposite to the outer surface of the inner tube as it goes in the direction opposite to the end surface 46a. A wedge plate 46 provided with a wedge hole 46e serving as a wedge surface 46f, a wedge roller 48 attached to the sensor bracket 43 and positioned in the wedge hole 46e, and an end face 40c of the sensor head main body 40. And the bellows cylinder 54 interposed between the wedge plate 46 and the end face 46a. When the bellows cylinder 54 is not extended, the sensor bracket is caused by the spring force generated by the extension of the disc spring device 42. 43 and the sensor unit 45 are pressed against the outer peripheral surface of the inner tube, and the reaction force of this pressing force is supported by the support frame 31 via the sensor head body 40 (reaction force pad 41), while the bellows cylinder 54 The pressurized gas was supplied to the bellows cylinder 54 and extended in the direction perpendicular to the pressing direction. When the wedge plate 46 moves in the orthogonal direction and the wedge roller 48 is pushed by the wedge surface 46f, the sensor bracket 43 moves together with the wedge roller 48 in the direction opposite to the outer peripheral surface of the inner tube. Since the spring device 42 contracts, the structure is such that the pressing of the sensor portion 45 (solid coplant 53) to the outer peripheral surface of the inner tube by the disc spring device 42 is released. The sensor unit 45 (solid coplant 53) can be pressed and released from the outer peripheral surface easily and stably, and a structure for stabilizing the pressing force of the ultrasonic flowmeter sensor head 11 can be realized. Can do.

  Further, according to the ultrasonic flowmeter sensor head 11 of the present embodiment, the use of the disc spring device 42 in which a plurality of disc springs are stacked is used. Spring force can be obtained.

  In addition, according to the ultrasonic flowmeter sensor head 11 of the present embodiment, the horizontal guide hole 46d is provided in the side surface 46c of the wedge plate 46, is attached to the sensor head main body 40, and is in the horizontal guide hole 46d. A plurality of horizontal guide rollers 47 positioned at the same position, and the wedge plate 46 is guided by the horizontal guide holes 46d and the horizontal guide rollers 47 so that the wedge plate 46 moves in the orthogonal direction. Due to the feature, the wedge plate 46 can be reliably moved in the orthogonal direction by the guide of the horizontal guide hole 46d and the horizontal guide roller 47, and the disc spring device 42 can be reliably contracted.

  Further, according to the ultrasonic flowmeter sensor head 11 of the present embodiment, gaps 57 and 58 are provided between the sensor head body 40 and the sensor bracket 43 and between the sensor bracket 43 and the disc spring device 42. Even if the ultrasonic flowmeter sensor head 11 is inclined by its own weight when the sensor unit 45 is pressed against the outer peripheral surface of the inner tube by the disc spring device 42, the sensor unit 45 is connected to the inner tube 3B and the sensor. It can be pressed perpendicularly to the tangential direction of the contact point of the portion 45 (solid coplant 53).

  This will be described in detail with reference to FIG. 10. Even when the connecting shaft 61 is in contact with the outside of the long hole 12b in the above-described procedure 3, the ultrasonic flowmeter sensor head 11 is caused by its own weight, as shown in FIG. Instead of the vertical state shown in a), as shown in FIG. 10B, for example, it may be inclined to the right side (inclination angle θ1: for example, 0.54 degrees). At this time, the guide roller 49 on one side contacts the upper surface of the guide rail 13 (the surface on the opposite side of the inner tube outer peripheral surface side of the recess 13a). However, after that, when the sensor unit 45 is pressed against the outer peripheral surface of the inner tube by the disc spring device 42 as shown in FIG. 10 (c), the contact between the sensor unit 45 and the outer peripheral surface of the inner tube as shown in FIG. 10 (d). A moment is generated with the point and the contact point between the guide roller 49 and the guide rail 13 as a fulcrum, and the ultrasonic flowmeter sensor head 11 rises to the left. As a result, as shown in FIG. 10E, the final inclination angle θ2 of the ultrasonic flowmeter sensor head 11 is, for example, 0.19 degrees, which is much smaller than the inclination angle θ1. In addition, since the gaps 57 and 58 are provided, the sensor unit 45 is not affected by the inclination on the sensor head body 40 side, and is tangential to the contact point between the inner tube 3B and the sensor unit 45 (solid coplant 53). On the other hand, it is pressed vertically.

  Further, according to the ultrasonic flowmeter sensor head 11 of the present embodiment, the guide roller 49 provided in the sensor head main body 40 is fixed to the outer peripheral surface of the inner tube along the circumferential direction of the outer peripheral surface of the inner tube. The ultrasonic flowmeter sensor head 11 is guided by the guide roller 49 with the guide roller 49 because the structure is such that it can move along the guide rail 13 by engaging and rolling with the rail 13. Can be easily disposed at any position in the circumferential direction of the outer peripheral surface of the inner tube.

  And according to the ultrasonic flowmeter sensor head device 7 of the present embodiment, the ultrasonic flowmeter sensor head 11 is connected by a plurality of connecting rods 12, which is limited. It is possible to arrange the ultrasonic flowmeter sensor head in the space (insertion arrangement of the ultrasonic flowmeter sensor head in a finite space). That is, it can be inserted into the space between the inner tube 3B and the outer tube 3C and installed on the outer peripheral surface of the inner tube.

  Further, according to the ultrasonic flowmeter sensor head device 7 of the present embodiment, the head side connecting portion 60 of the sensor head main body 40 and the rod side connecting portion 12 a of the connecting rod 12 are fixed to the head side connecting portion 60. Since the connected connecting shaft 61 is connected by being inserted into a long hole 12b that is long in the axial direction of the connecting rod 12 formed in the rod side connecting portion 12a, the ultrasonic flowmeter sensor head The thermal displacement of each part such as 11 can be absorbed by the long hole 12b.

  In particular, the ultrasonic flowmeter sensor head device 7 according to the present embodiment is characterized in that the connecting shaft is located outside the elongated hole, and the connecting rod 12 and the sensor are increased by the temperature rise of liquid sodium. Even if the head main body 40 undergoes thermal elongation, the thermal expansion can be absorbed by the elongated hole 12b by moving the connecting shaft 61 inwardly through the elongated hole 12b. It is possible to prevent the displacement of the meter sensor head 11 from occurring.

  Further, according to the ultrasonic flowmeter sensor head device 7 of the present embodiment, eight ultrasonic flowmeter sensor heads 11 are moved along the guide rail 13, and among the eight ultrasonic flowmeter sensor heads 11. A first procedure of bringing the contact portion 14 of the head ultrasonic flowmeter sensor head 11 into contact with the stopper 15 fixed to the outer peripheral surface of the inner tube and bringing the connecting shaft 61 into contact with the inside of the elongated hole 12b; Second procedure of discharging the pressurized gas from the bellows cylinder 54 of the head ultrasonic flowmeter sensor head 11 and pressing only the head ultrasonic flowmeter sensor head 11 against the outer peripheral surface of the inner tube by the disc spring device 42 And the other (seven) ultrasonic flowmeter sensor heads 11 connected to the rear of the head ultrasonic flowmeter sensor head 11 are defined as the moving direction of the ultrasonic flowmeter sensor head 11 in the first procedure. By pulling in the reverse direction and returning the length of the long hole 12b, the third procedure for bringing the connecting shaft 61 into contact with the outside of the long hole 12b and the bellows cylinder 54 of the other ultrasonic flowmeter sensor head 11 are performed. It is characterized by having a fourth procedure for discharging the pressurized gas and pressing the other ultrasonic flowmeter sensor head 11 against the outer peripheral surface of the inner tube by the disc spring device 42. 61 can be located outside the elongated hole 12b. For this reason, even if the connecting rod 12 and the sensor head main body 40 are thermally expanded due to the above effect, that is, the temperature rise of liquid sodium, the connecting shaft 61 moves inwardly in the elongated hole 12b. Since the thermal elongation can be absorbed by the long holes 12b, it is possible to reliably obtain the effect that the occurrence of a compressive load and displacement of the ultrasonic flowmeter sensor head 11 can be prevented.

  In the above description, the number of ultrasonic flowmeter sensor heads 11 provided in each ultrasonic flowmeter sensor head device 7 is eight. However, the number of the ultrasonic flowmeter sensor heads 11 is not limited to this. (6 or 4 may be sufficient). When the number of the ultrasonic flowmeter sensor heads 11 is less than eight, the interval between the ultrasonic flowmeter sensor heads 11 is widened. Therefore, the length of the connecting rod may be increased correspondingly.

  The present invention relates to an ultrasonic flowmeter sensor head, an ultrasonic flowmeter sensor head apparatus including the ultrasonic flowmeter sensor head, and a positioning method thereof, and is applicable to various types of piping. In particular, a fast breeder reactor using high chromium steel. It is useful when applied to the primary cooling system piping of (sodium cooling furnace).

1 is a cross-sectional view of a fast breeder reactor (sodium-cooled reactor) to which an ultrasonic flowmeter sensor head device according to an embodiment of the present invention is applied. It is a longitudinal cross-sectional view of the fast breeder reactor (sodium-cooled reactor). It is a schematic diagram of the ultrasonic flowmeter sensor head device. It is a side view which shows the structure of one ultrasonic flowmeter sensor head apparatus (for one side of one channel). It is a side view of one ultrasonic flowmeter sensor head. It is a perspective view which shows the ultrasonic flowmeter sensor head partly broken. It is a longitudinal cross-sectional view of the ultrasonic flowmeter sensor head. It is a perspective view which shows the ultrasonic flowmeter sensor head partly broken and disassembled. It is explanatory drawing which shows the insertion (positioning) procedure of an ultrasonic flowmeter sensor head apparatus. It is explanatory drawing of perpendicularization of the pressing angle of an ultrasonic flowmeter sensor head (sensor part).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reactor vessel 2 Intermediate heat exchanger 3 Low temperature side piping 3A Straight pipe part 3B Inner tube 3C Outer tube 4 High temperature side piping 5 Core 6 Primary cooling system pump 7 Ultrasonic flow meter sensor head device 11 Ultrasonic flow meter sensor head 12 Connecting rod 12a Rod side connecting portion 12b Elongated hole 13 Guide rail 13a Recessed portion 14 Contact portion 15 Stopper 16 First extension rod 17 Guide tube 18 Floor 19 First extension guide rail 20 Second extension guide rail 21 Lid member 22 Insertion / extraction Device 23 Base 24 Winding device 25 Bush chain 26 Hook 27 Second extension guide rail 28 Third extension guide rail 31 Support frame 31a Reaction force receiving portion 31b Leg portion 40 Sensor head main body 40a End surface 40b Fitting hole 40c Rear end surface 40d Side surface 41 Reaction Force Pad 42 Belleville Spring Device 42a Through Hole 43 Sensor Bracket 43a End 43b Hole 43c Side 44 Main body guide 45 Sensor part 46 Wedge plate 46a End face 46c Side 46d Horizontal guide hole 46e Wedge hole 46f Wedge surface 47 Horizontal guide roller 48 Wedge roller 49 Guide roller 50 Guide shaft 51 Piezoelectric element 52 Shoe 53 Solid coplant 54 Bellows cylinder 55 Pressurized gas supply pipe 56 Electric cable 57, 58 Clearance 59 Shaft guide 60 Head side connection 60a Connection shaft hole 61 Connection shaft 71 Power switch (contact)

Claims (9)

An ultrasonic flowmeter sensor head installed on the outer peripheral surface of the pipe for measuring the flow rate of the fluid flowing in the pipe,
Disposed between a support frame fixed to the pipe outer peripheral surface and the pipe outer peripheral surface;
A sensor head body located on the support frame side;
A sensor bracket located on the outer peripheral surface of the pipe;
A sensor unit fixed to the sensor bracket;
A solid plant affixed to the sensor unit;
An elastic member interposed between the sensor head body and the sensor bracket;
It has an end face that faces the end face of the sensor head main body, and a side face that faces the side face of the sensor head main body, and on this side face, the inner surface on the pipe outer peripheral surface side and closer to the side opposite to the end face, A wedge plate provided with a wedge hole that is a wedge surface inclined in a direction opposite to the pipe outer peripheral surface as it goes in the direction opposite to the end surface;
A wedge roller attached to the sensor bracket and located in the wedge hole;
A bellows cylinder interposed between an end surface of the sensor head body and an end surface of the wedge plate;
When the bellows cylinder is not extended, the solid force plant is pressed against the pipe outer peripheral surface together with the sensor bracket and the sensor portion by the spring force generated by the elastic member extending, and the reaction force of the pressing force is While supported by the support frame via the sensor head body,
When the pressurized gas is supplied to the bellows cylinder and the bellows cylinder extends in a direction orthogonal to the pressing direction, the wedge plate moves in the orthogonal direction and the wedge roller is pressed against the wedge surface. As a result, the sensor bracket moves together with the wedge roller in the direction opposite to the outer peripheral surface of the pipe, and the elastic member contracts, so that the pressing of the sensor portion on the outer peripheral surface of the pipe by the elastic member is released. An ultrasonic flowmeter sensor head characterized by having a configuration. The ultrasonic flowmeter sensor head according to claim 1,
The ultrasonic flowmeter sensor head according to claim 1, wherein the elastic member is a disc spring device in which a plurality of disc springs are stacked. In the ultrasonic flowmeter sensor head according to claim 1 or 2,
A horizontal guide hole is provided on the side surface of the wedge plate,
A plurality of horizontal guide rollers attached to the sensor head body and positioned in the horizontal guide hole;
An ultrasonic flowmeter sensor head characterized in that the wedge plate is guided by the horizontal guide hole and the horizontal guide roller so that the wedge plate moves in the orthogonal direction. In the ultrasonic flowmeter sensor head according to any one of claims 1 to 3,
An ultrasonic flowmeter sensor head, wherein gaps are provided between the sensor head body and the sensor bracket and between the sensor bracket and the elastic member. In the ultrasonic flowmeter sensor head according to any one of claims 1 to 4,
The guide roller provided in the sensor head body moves along the guide rail by rolling by engaging with the guide rail fixed to the pipe outer peripheral surface along the circumferential direction of the pipe outer peripheral surface. An ultrasonic flowmeter sensor head, characterized in that it is configured to be able to perform.   An ultrasonic flowmeter sensor head device comprising a plurality of ultrasonic flowmeter sensor heads according to claim 5 connected by connecting rods. In the ultrasonic flowmeter sensor head device according to claim 6,
The sensor head side connecting portion of the sensor head main body and the rod side connecting portion of the connecting rod have a connecting shaft fixed to the sensor head side connecting portion, and an axial direction of the connecting rod formed in the rod side connecting portion. An ultrasonic flowmeter sensor head device, wherein the ultrasonic flowmeter sensor head device is connected by being inserted into a long long hole. In the ultrasonic flowmeter sensor head device according to claim 7,
The ultrasonic flowmeter sensor head device, wherein the connecting shaft is located outside the elongated hole when the sensor is pressed. A method for positioning an ultrasonic flowmeter sensor head device according to claim 7,
The plurality of ultrasonic flowmeter sensor heads are moved along the guide rail, and a contact portion of a head ultrasonic flowmeter sensor head among the plurality of ultrasonic flowmeter sensor heads is disposed on the outer peripheral surface of the pipe. A first procedure in which the connecting shaft is brought into contact with the inside of the elongated hole by contacting the fixed stopper;
A second procedure in which pressurized gas is discharged from the bellows cylinder of the head ultrasonic flowmeter sensor head, and only the head ultrasonic flowmeter sensor head is pressed against the pipe outer peripheral surface by the elastic member;
Pulling another ultrasonic flowmeter sensor head connected behind the head ultrasonic flowmeter sensor head in a direction opposite to the moving direction of the ultrasonic flowmeter sensor head in the first procedure, A third procedure for bringing the connecting shaft into contact with the outside of the slot by returning the length of the slot;
A fourth procedure in which pressurized gas is discharged from the bellows cylinder of the other ultrasonic flowmeter sensor head, and the other ultrasonic flowmeter sensor head is pressed against the pipe outer peripheral surface by the elastic member;
A method for positioning an ultrasonic flowmeter sensor head device, comprising:

Images