JP5431410B2 - Weak point pin breakage detector - Google Patents

Description

  The present invention relates to a weak pin breakage detection device that detects that a weak pin having a breakage portion that breaks due to a load is broken. For example, operation of a guide vane in a Francis turbine or a propeller turbine installed in a hydroelectric power plant The present invention relates to a weak pin breakage detection device incorporated in a mechanism unit.

  In general, in the above-described hydroelectric power plant, a water turbine, a power generator, a water wheel, and a control device that controls the operation of the power generator are arranged. As the turbine, the Francis turbine is often used, and the Francis turbine is arranged so as to follow the rotation supported shaft, the runner fixed to the end of the shaft, and the outer periphery of the runner. And a spiral casing connected to the lower end of the hydraulic pipe having a drop, and a discharge pipe connected to the casing (not shown).

  In the Francis turbine, the water that flows into the inside from the hydraulic pipe through the casing flows inward in the radial direction with respect to the runner, and the direction is changed in the axial direction by the runner and flows out to the outside through the discharge pipe. It is configured.

  Further, the Francis turbine is provided with a guide vane mechanism that is disposed on the outer periphery of the runner so as to be opened and closed in order to adjust the amount of water flowing inwardly with respect to the runner. As shown in FIG. 1, the guide vane mechanism A includes a rotatable guide ring (inner ring) 1 for operating the guide vanes 2,... A support ring (outer ring) 4 in which the shafts 3 are arranged at equal intervals, and a link mechanism 5 that connects the guide ring 1 and the guide vane shafts 3,. Then, a mechanism for rotating the guide vanes 2 and so on by inserting foreign matter such as driftwood into the guide vanes 2 when rotating in the closing direction from the open state to the connecting portion of the link mechanism 5. The weak point pin 20 which protects the guide vane mechanism A by preventing a local overload from being applied to the portion is disposed (see FIG. 2).

  And when the weak pin 20 mentioned above breaks, since it is necessary to alert | report that the weak pin 20 was broken to a remote operator, the weak point of the water turbine which has arrange | positioned the means to detect and notify the break of the weak pin 20 A pin breakage detection device is provided. As a conventional device of this type, for example, a sensor that detects that a plurality of weak pins are damaged due to an overload caused by a foreign substance, and an alarm device that warns the outside based on a detection signal of the sensor, The thing provided with this is publicly known (refer to patent documents 1). As shown in FIG. 7, the weak point pin breakage detecting device 50 of the water wheel is inserted into each weak point pin 51, and a plurality of light emitting diodes (hereinafter referred to as LEDs) 52,. Sensors 54,... Having lower resistance values than the resistance values of the LEDs 52,... Individually connected in parallel to the LEDs 52,. ing. Each of the sensors 54,... Is connected in series to form a constant current circuit 55. A power supply unit that supplies a constant current to the constant current circuit 55 and a branch line 53 caused by breakage of the weak pin 51,. The control part 56 which has a detection part which detects the cutting | disconnection of this is provided.

  In normal times, the weak pins 51,... Are not broken, and the branch lines 53,... Having a lower resistance than that of the LEDs 52, are energized, and the LEDs 52,. . At the time of abnormality, for example, when a foreign object such as driftwood is sandwiched between guide vanes and one weak point pin 51 breaks among the plurality of weak point pins 51, the branch line 53 is cut along with the breakage of the weak point pin 51. As a result, the LED 52 at the location where the branch line 53 is cut off is energized, the LED 52 emits light, the alarm device is activated based on the ON signal of the LED 52, and the weak pin 51 is broken. To be notified.

JP 2010-106865 A

  However, in the case of the conventional weak pin breakage detection device 50, a plurality of LEDs 52,... Are connected in series, branch lines 53,... Are individually connected in parallel to the LEDs 52,. It is necessary to interpolate the lines 53,... To the respective weak point pins 51,. Further, at the time of abnormality, the branch line 53 is also cut along with the breakage of the weak pin 51, so that water supply is performed with the conductor of the branch line 53 exposed. Therefore, it is considered that the environment is not preferable even if the branch line 53 is not energized.

  In view of the above, an object of the present invention is to provide a weak pin breakage detection device having a simple configuration and capable of safely detecting breakage of a weak pin in an environment where water is used.

The weak pin breakage detection device according to the present invention is operatively connected to a plurality of guide vanes 2,... That adjust the amount of water flowing into the turbine wheel in the radially inward direction according to the degree of opening, and foreign matter is introduced into the guide vane 2. In the weak pin breakage detection device that detects that the weak pin 20 having the breakage portion 21 that breaks due to a load generated when being sandwiched or the like is broken, the detection fluid supply portion 11 that stores a predetermined amount of the detection fluid; a first breakage detection element 12 having in the across the broken portion 21 of weakness pin 20 to weaknesses pin 20 in the axial direction a conduit 12a, a conduit 12a of the detecting fluid supply unit 11 and the first breakage detection element 12 a supply tube 15 connected hermetically, a bottomed cylindrical member 26 to be inserted into the axially weakness pin 20 so as to cross the broken portion 21 of the weaknesses pin 20, it inside the negative pressure state Is contracted to; and a second breakage detection device 25 and a telescopic member 27 which is hermetically connected to the open end 26a of the bottomed cylindrical member 26.

In this case, the detection fluid of the detection fluid supply unit 11 is supplied to the conduit 12 a of the first breakage detection element 12 through the supply tube 15, and the breakage of the breakage portion 21 of the weak pin 20 is activated with the guide vane 2. As a result, the pipe 12a of the first breakage detection element 12 breaks, and the detection fluid in the detection fluid supply unit 11 leaks to the outside, and the detection stored in the detection fluid supply unit 11 By reducing the amount of fluid, it is possible to detect that the weak pin 20 is broken. Further, the bottomed tubular member 26 is inserted in the weakened pin 20 in an axial direction so as to cross the broken portion 21 of the weakened pin 20, and the bottomed tubular member 26 is contracted so as to be in a negative pressure state. Since the member 27 is hermetically connected, when the broken portion 21 of the weak pin 20 is broken, the bottomed cylindrical member 26 is also broken, and air is sucked from the broken opening of the bottomed cylindrical member 26. Thus, air is introduced into the contracted negative pressure expansion / contraction member 27 and the expansion / contraction member 27 expands, and the operator can select which weak point pin among the plurality of weak point pins 20. Whether or not 20 is broken can be known by visually observing the expanded elastic member 27.

  Further, according to the present invention, the first breakage detecting element 12 is provided in each weak pin 20,..., And the tube of each first breakage detecting element 12 is connected to the detection fluid supply unit 11 via the supply tube 15. A configuration in which the paths 12a are connected in series can also be employed.

  In this case, since the conduit 12a of each first breakage detection element 12 is connected in series to the detection fluid supply unit 11 via the supply tube 15, one of the plurality of first breakage detection elements 12 is connected. However, if it breaks, the storage amount of the detection fluid supply unit 11 decreases, and it is possible to detect that the weak pin 20 is broken.

  Further, according to the present invention, it is also possible to adopt a configuration in which the elastic member 27 is inserted in the weak pin 20 in the axial direction in a contracted state so as to protrude from the weak pin 20 when extended. it can.

  In this case, when the bottomed cylindrical member 26 breaks, the contracted expansion / contraction member 27 extends and protrudes from the weak pin 20, so that the operator can extend the elastic member 27 protruding from the weak pin 20. It is possible to visually check which weak point pin 20 is broken.

  In addition, according to the present invention, it is possible to adopt a configuration in which the bottomed cylindrical member 26 of the second breakage detection element 25 is inserted in the pipe 12 </ b> A of the first breakage detection element 12 in the axial direction.

  In this case, since the bottomed cylindrical member 26 of the second breakage detection element 25 and the pipe line 12A of the first breakage detection element 12 are arranged on the same axis, breakage by the breakage portion 21 of the weak pin 20 is ensured. It is done smoothly.

The weak point pin breakage detection device according to the present invention is a weak point pin breakage detection device that detects that the weak point pin 20 having the breakage portion 21 that breaks due to a load is broken, and a detection fluid supply unit that stores a predetermined amount of detection fluid. 11, the first breakage detection device 12 having a conduit 12a axially weakness pin 20 so as to cross the broken portion 21 of the weaknesses pin 20, the detection fluid supply unit 11 and the first breakage detection element 12 A supply tube 15 that hermetically connects the pipe 12a, a bottomed cylindrical member 26 that is inserted in the weak pin 20 in the axial direction so as to cross the broken portion 21 of the weak pin 20, and a negative pressure inside. And a second breakage detecting element 25 having an expansion / contraction member 27 that is contracted in such a manner and is airtightly connected to the open end 26a of the bottomed cylindrical member 26 .

According to the present invention, the detection fluid supply unit for storing a predetermined amount of detection fluid is disposed, and the detection fluid is supplied from the detection fluid supply unit to the conduit of the first breakage detection element inserted in the axial direction in the weak pin. Therefore, it is possible to detect the breakage of the weak pin by looking at the change in the storage amount of the detection fluid stored in the detection fluid supply unit. That is, the breakage of the weak pin can be detected safely even in an environment that uses a simple configuration and uses water. Also, the bottomed tubular member is inserted axially into the weak point pin so as to cross the broken part of the weak point pin, and the bottomed tubular member is hermetically connected to the expansion and contraction member contracted so as to be in a negative pressure state. Therefore, if the broken part of the weak pin breaks, the bottomed cylindrical member will also be broken, and air will be sucked from the broken opening of the bottomed cylindrical member, causing the contracted negative Air is introduced into the inside of the stretchable member in a compressed state, and the stretchable member expands, and the operator visually observes the stretched stretchable member to determine which weakness pin of the plurality of weakness pins is broken. You can know.

The figure which shows the principal part of a Francis turbine. Sectional drawing which shows the connection part of the guide vane mechanism of FIG. The weak point pin breakage detection apparatus according to the first embodiment of the present invention is shown, (a) is a diagram showing the state of the first breakage detection element and the second breakage detection element in the weak point pin in a normal state, (b) ) Is a diagram showing a state of the first breakage detection element and the second breakage detection element when the weak point pin breaks during an abnormality. (A) shows the breakage detection apparatus of the weak point pin which concerns on 2nd Embodiment of this invention, The figure which shows the state of the weak point pin at the time of normal, (b) is the state which the weak point pin broke at the time of abnormality FIG. The figure which shows the modification of the pipe line of a 1st breakage detection element. It is a figure which shows the modification of a 2nd breakage detection element, (a) is sectional drawing which shows the state by which the detection pin as a 2nd breakage detection element was inserted in the weak point pin, (b) is a detection pin FIG. 6C is a cross-sectional view showing a state where the shaft portion of the detection pin is broken and the head portion of the detection pin protrudes from the head portion of the weak pin when an abnormality occurs. The figure which shows the breakage detection apparatus of the conventional weak point pin.

  An embodiment of a weak pin breakage detection apparatus according to the present invention will be described with reference to FIGS.

(First embodiment)
First, the weak pin breakage detection apparatus according to the first embodiment will be described. Here, the configuration of the water turbine of the hydroelectric power station will be briefly described. As in the conventional case, a Francis turbine is used as the turbine, and in the Francis turbine, water that flows into the interior from the hydraulic pipe through the casing flows inwardly in the radial direction with respect to the runner. It is configured such that the direction is changed in the axial direction and flows out through the discharge pipe. Further, the Francis turbine is provided with a guide vane mechanism that is disposed on the outer periphery of the runner so as to be opened and closed in order to adjust the amount of water flowing inwardly with respect to the runner. As shown in FIG. 1, the guide vane mechanism includes a rotatable guide ring (inner ring) 1 for operating the guide vanes 2,... And a guide vane shaft that is disposed concentrically with the guide ring 1. Are provided with a support ring (outer ring) 4 arranged at equal intervals, and a link mechanism 5 for connecting the guide ring 1 and the guide vane shafts 3,. Then, as shown in FIG. 2, foreign matter such as driftwood is sandwiched between the guide vanes 2 when rotating from the open state to the closing direction, as shown in FIG. ,... Are provided with a weak pin 20 that protects the guide vane mechanism A by preventing a local overload from being applied to the mechanism.

  The weak point pin 20 is formed of a solid cylindrical body, and an annular broken portion 21 having a V-shaped cross section is formed on the outer peripheral surface of the upper portion, and the weak point pin 20 is located above the broken portion 21. The lower part including the broken part 21 is the shaft part 20b of the weak pin 20. When the breakage portion 21 is broken, the weak pin 20 is broken in the direction orthogonal to the axis, and the operative connection with the guide vane 2 is broken. At the same time, the first breakage detection described later is performed. The second linear portions 121a and 121b of the element 12 and the bottomed cylindrical member 26 of the second breakage detecting element 25 are configured to be broken. In addition, a concave portion 22 having a circular cross section is formed in the central portion of the head 20a of the weak pin 20 in which a telescopic member 27 of a second breakage detecting element 25 described later is inserted. In the state where the expansion / contraction member 27 of the second breakage detection element 25 is contracted and inserted into the recess 22 of the weak point pin 20, the end surface of the head 20 a of the weakness pin 20 and the expansion / contraction of the second breakage detection element 25. The upper surface of the member 27 is flush with the upper surface.

  Here, the weak pin breakage detection device 10 according to the first embodiment is disposed inside a casing (not shown), and also includes a detection fluid supply unit 11 that stores a predetermined amount of detection fluid, and each weak point pin 20, Are inserted in the axial direction into the first breakage detecting elements 12,..., The detection fluid supply unit 11 and the first breakage detecting elements 12,. And the second breakage detecting element 25 inserted in the.

  The detection fluid supply unit 11 is disposed at a pair of plate members 110 and 110 arranged at predetermined intervals in the upper and lower sides, and at a central portion of the plate members 110 and 110, and is filled with a predetermined amount of air. The telescopic bellows 111 are inserted between the plate members 110 and 110 so as to be located outside the bellows 111, and are stretched by the filled air, that is, in a stored state. And a compression spring 112 in a state where air can be introduced into each weak point pin 20 at a constant pressure.

  Although not shown, the pair of plate members 110 and 110 are provided with a pair of electrodes that are in contact with and electrically connected to each other when the plate members 110 and 110 come close to each other, and the electrodes are in contact with each other. Thus, it is assumed that alarm means for notifying a remote worker of an alarm is arranged.

  The first breakage detection element 12 is configured by a pipe line 12a made of a pipe body to which a predetermined amount of detection fluid is supplied from the detection fluid supply unit 11, and the pipe line 12a is formed on the head 20a of the weak pin 20a. It has a substantially Y-shape having a bent portion 120 located in the vicinity and a curved portion 121 located from the head 20a of the weak pin 20 to the shaft portion. The bent portion 120 includes first linear portions 120a and 120a formed in a vertical direction from both sides of the head 20a of the weak pin 20 and the axis of the weak pin 20 from the first linear portions 120a and 120a. Inclined portions 120b and 120b. And the expansion member 27 of the 2nd breakage detection element 25 mentioned later and the bottomed cylinder member 26 are formed in a pentagonal region in front view formed by the first linear portions 120a, 120a and the inclined portions 120b, 120b. The upper end is located.

  The curved portion 121 has a substantially U-shape, and is drawn along the axial direction from one inclined portion 120b toward the middle portion of the weak point pin 20, and then folded back from the middle portion of the weak point pin 20. It is pulled out along the axial direction toward the other inclined portion 120b. The bottomed cylindrical member 26 of the second breakage detecting element 25 described later is erected by a gap formed by the second linear portion 121a to be pulled in, the folded portion 122, and the second linear portion 121b to be pulled out. Inserted and supported in a state. That is, the second linear portion 121a and the second linear portion 121b of the curved portion 121 are configured to sandwich the bottomed cylindrical member 26 of the second breakage detecting element 25. By doing so, the second linear portion 121a and the second linear portion 121b of the curved portion 121 and the bottomed cylindrical member 26 of the second breakage detecting element 25 are concentrated along the axis of the weak pin 20. Thus, the breakage of the weak pin 20 is easily broken.

  The supply tube 15 includes a first connection tube 150 that connects the detection fluid supply unit 11 and the weak point pin 20 on the upstream side, and a second connection tube 151 that connects the weak point pins 20. The first connection tube 150 is connected to the lower plate member 110 in an airtight manner so that the air in the bellows 111 of the detection fluid supply unit 11 can be introduced to the weak point pin 20 on the upstream side. The weak pin 20 is connected to the first linear portion 120a on one side of the first breakage detection element 12. The second connecting tubes 151,... Are provided on the other side of the first linear portion 120 a on the other side of the first breakage detecting element 12 of the weak point pin 20 on the upstream side and on one side of the first breakage detecting element 12 on the downstream side weak point pin 20. The first linear portion 120a is connected to the first weak point pin 20 from the upstream side to the downstream side in order. That is, by connecting the supply tube 15 from the detection fluid supply unit 11 to each weak point pin 20,..., The pipeline 12 a of each first breakage detection element 12 is connected in series and connected to the detection fluid supply unit 11. The That is, air as a detection fluid is supplied to the pipe line 12a of each first breakage detection element 12 at a constant pressure.

  The second breakage detecting element 25 is contracted by the bottomed cylindrical member 26 inserted in the axial direction of the shaft portion of the weak pin 20 and the concave portion 22 in the head portion 20a of the weak pin 20 in the axial direction in a negative pressure state. And a telescopic member 27 to be inserted. And the opening end part 26a of the bottomed cylindrical member 26 and the opening part 27a of the expansion-contraction member 27 are airtightly connected so that the negative pressure state of the expansion-contraction member 27 may be maintained. When the expansion / contraction member 27 of the second breakage detection element 25 is inserted in a contracted state, the upper surface of the expansion / contraction member 27 and the end surface of the head 20a of the weak pin 20 are flush with each other to form a flat surface. . On the other hand, the bottomed tubular member 26 of the second breakage detecting element 25 is configured so that the middle part of the bottomed tubular member 26 is broken by the broken part 21 of the weak pin 20. It is inserted and supported between the linear portions 121a and 121b. And as a raw material of the bottomed cylinder member 26, the product made from a synthetic resin, glass, or a magnet is used. As the material of the expansion / contraction member 27, either a soft synthetic resin or an airtight paper is used. In short, it is only necessary to have the strength to break along with the breakage of the weak pin 20, and to withstand the pressure of the water supplied to the detection fluid and the water turbine.

  Next, a procedure for detecting breakage of the weak pin 20 will be described. 3A, the bellows 111 of the detection fluid supply unit 11 is filled with a predetermined amount of air as the detection fluid, and the compression spring 112 is expanded to be in an energy storage state. It has become. That is, a compressive force is always applied to the air inside the bellows 111. Therefore, a predetermined amount of air passes through the first connection tube 150 and the second connection tube 151 of the supply tube 15 and a predetermined amount of air is supplied to the ducts 12a of the first breakage detection elements 12,. It is supplied with pressure. On the other hand, the expansion / contraction member 27 of the second breakage detection elements 25,... Is contracted and inserted into the recess 22 of the weak pin 20 in a negative pressure state, and the bottomed cylindrical member 26 of the second breakage detection elements 25,. The first breakage detecting element 12 is inserted and supported between the second linear portions 121a and 121b.

  When the foreign matter is caught between the guide vanes 2 shown in FIG. 1, the weak pin 20 with the foreign matter is broken from the broken portion 21 of the weak pin 20 as shown in FIG. The second linear portions 121a and 121b of the one breakage detection element 12 and the bottomed cylindrical member 26 of the second breakage detection element 25 are broken. At this time, air is discharged to the outside from the respective second linear portions 121a and 121b of the broken first breakage detection element 12, and the bellows 111 of the detection fluid supply portion 11 is contracted by the releasing force of the compression spring 112. Then, air is sucked from the bottomed cylindrical member 26 of the broken second breakage detection element 25, the expansion / contraction member 27 of the second breakage detection element 25 is expanded, and the expanded expansion / contraction member 27 is the head 20 a of the weak pin 20. , And it is possible to detect whether one of the weak pin 20 is broken.

  Thus, according to the weak pin breakage detection device according to the first embodiment, the detection fluid supply unit 11 that stores the detection fluid is disposed, and the first breakage detection element 12 and the second breakage detection are provided on the weak point pin 20. The element 25 is inserted, and the breakage of the weak pin 20 is associated with the amount of the detection fluid that changes in the detection fluid supply unit 11 and the amount of the fluid that changes in the expansion / contraction member 27 of the second breakage detection element 25. Therefore, it is possible to safely detect that the weak pin 20 is broken with a simple configuration without causing any trouble to surrounding equipment.

(Second Embodiment)
Next, a weak pin breakage detection apparatus according to the second embodiment will be described with reference to FIGS. 4 (a) and 4 (b), the same reference numerals as those in FIGS. 3 (a) and 3 (b) denote the same or corresponding parts. The difference is that the fluid stored in the detection fluid supply unit 11A is water. A predetermined weight on the surface of the stored water so that a predetermined pressure is applied to the water stored in the water tank 110A and the water tank 110A storing the water. The flat plate 111A is loaded. In addition, 10A in a figure shows a weak point pin breakage detection apparatus.

  Next, a procedure for detecting breakage of the weak pin 20 will be described. In a normal state, as shown in FIG. 4A, a predetermined amount of water as a detection fluid is stored in the water tank 110A of the detection fluid supply unit 11A, and a flat plate 111A having a predetermined weight is pushed up above the water tank 110A. It has been. That is, a predetermined pressure is always applied to the water in the water tank 110A. Accordingly, a certain amount of water is supplied at a predetermined pressure to the first breakage detection element 12 of each weak pin 20 through the first connection tube 150 and the second connection tube 151 of the supply tube 15. On the other hand, the expansion / contraction member 27 of the second breakage detection element 25 is contracted and inserted into the recess 22 of the weak pin 20 in a negative pressure state, and the bottomed cylindrical member 26 of the second breakage detection element 25 is The detection element 12 is inserted and supported between the second linear portions 121a and 121b.

  Then, in the event of an abnormality where foreign matter is caught in the guide vane 2 shown in FIG. 1, the weak point pin 20 where the foreign matter is caught breaks from the broken portion 21 of the weak point pin 20 as shown in FIG. The second linear portions 121a and 121b of the one breakage detection element 12 and the middle part of the bottomed cylindrical member 26 of the second breakage detection element 25 are broken. At this time, water is discharged to the outside from the second linear portions 121a and 121b of the broken first breakage detection element 12, the water in the water tank 110A of the detection fluid supply unit 11 is reduced, and the flat plate 111A is the water tank 110A. While being lowered to the low position, air is sucked from the bottomed cylindrical member 26 of the broken second breakage detecting element 25, the elastic member 27 of the second broken element 25 is extended, and the extended elastic member 27 is the weak pin 20. The head 20a protrudes from the head 20a, and it is possible to detect whether one of the weak pin 20 is broken.

  Thus, according to the weak pin breakage detection device 10A according to the second embodiment, as in the first embodiment, the breakage of the weak pin 20 and the amount of the detection fluid that changes in the detection fluid supply unit 11A, Since the amount of fluid that changes in the expansion / contraction member 27 of the second breakage detection element 25 is correlated, it is possible to safely detect that the weak pin 20 is broken with a simple configuration.

  The weak pin breakage detection device according to the present invention can be variously modified without being limited to the first and second embodiments.

  For example, in each of the above embodiments, the pipe 12a of the first breakage detecting element 12 is configured by a pipe, but as shown in FIG. 5, the through-hole of the pipe 12A through which the detection fluid flows. You may make it comprise. The pipe line 12A has a straight portion 120A formed along the axial direction of the weak pin 20 and a truncated cone-shaped concave portion 121A connected to the straight portion 120A. And the support body 125 for supporting the bottomed cylinder member 26 of the 2nd breakage detection element 25 in an airtight upright state is needed for the pipe line 12A. The support 125 is formed in a disc shape by being connected to the first support portion 126 that supports the bottomed cylindrical member 26 of the second breakage detecting element 25 by the through hole 127 and the first support portion 126. The concave portion 129 includes an annular second support portion 128 that supports the elastic member 27 of the second breakage detection element 25. A male screw 128 a is formed on the outer peripheral surface of the second support portion 128. The male screw 128a and the female screw 122A of the recess 121A of the conduit 12A are screwed together, and the support 125 is fixed to the conduit 12A.

  Further, in the case of each of the embodiments described above, the conduit 12 a of the first breakage detection element 12 and the bottomed cylindrical member 26 of the second breakage detection element 25 are arranged so as to be gathered at the axial center of the weak pin 20. Each of the pipe line 12 a of the first breakage detection element 12 and the bottomed cylindrical member 26 of the second breakage detection element 25 may be disposed at a position shifted from the axial center of the weak pin 20. In short, as long as the weak pin 20 is broken, the pipe 12a of the first breakage detection element 12 and the bottomed tubular member 26 of the second breakage detection element 25 may be broken.

  In each of the above embodiments, as the second breakage detecting element 25, the expansion / contraction member 27 hermetically connected to the bottomed tubular member 26 is used. However, the breakage composed of a spring-biased detection pin is used. The detection element 30 may be used. As the breakage detection element 30, for example, as shown in FIG. 6A, a spring 31 is provided in the head 200a of the weak pin 200 above the breakage part 210 (position above the breakage part 210). A recessed portion 220 to be inserted is formed, and an insertion hole 221 of the detection pin 30 is formed along the axial direction in the central portion of the bottom portion of the recessed portion 220, and a female screw portion 222 is formed on the peripheral wall of the bottom portion of the insertion hole 221. Has been. Reference numeral 200b in the drawing denotes a shaft portion of the weak pin 200 including the breakage portion 210. As shown in FIG. 6B, the detection pin 30 is formed with a hexagonal insertion hole 30b into which a hexagon wrench (not shown) is inserted at the center of the disc-shaped head 30a. A male screw 30d that is screwed into the female screw portion 222 of the insertion hole 221 of the weak pin 200 is formed at the tip of the shaft portion 30c.

  The tip of the hexagon wrench (not shown) is inserted into the insertion hole 30b of the head 30a of the detection pin 30, and the detection pin is opposed to the spring 31 inserted in the recess 220 of the weak point pin 200. While pressing the shaft 30 in the axial direction, that is, while compressing the spring 31, the male screw 30 d of the shaft portion 30 c of the detection pin 30 is screwed into the female screw portion 222 of the insertion hole 221 of the weak pin 200, and The detection pin 30 is fixed in a straight line along the axis of the weak pin 200. Then, as shown in FIG. 5A, the weak point pin 200 is normally in a state where the spring 31 inserted in the concave portion 220 of the weak point pin 200 is in contact with the lower surface of the head 30 a of the detection pin 30. The male screw 30 d of the shaft portion 30 c of the detection pin 30 is screwed into the female screw portion 222 of the insertion hole 221. That is, the detection pin 30 is elastically biased in the advance direction by the spring 31.

  When the weak point pin 200 breaks from this state, as shown in FIG. 6C, the midway portion of the shaft portion 30c of the detection pin 30 breaks, and the head portion 30a of the detection pin 30 is compressed by the spring 31 in the compressed state. The head 30 a of the detection pin 30 is advanced from the head 200 a of the weak pin 200 by being pushed up by the releasing force. That is, the advancement of the detection pin 30 makes it possible to visually recognize whether one of the weak point pins 200 is broken.

  In this case, since the breakage of the weak pin 200 is associated with the advance amount of the detection pin 30 that changes due to the elastic bias of the spring 31, it is possible to safely detect that the weak pin 200 is broken with a simple configuration. can do.

DESCRIPTION OF SYMBOLS 2 ... Guide vane, 11 ... Detection fluid supply part, 12 ... 1st breakage detection element, 12a, 12A ... Pipe line, 15 ... Supply tube, 20 ... Weak point pin, 20a ... Head part, 20b ... Shaft part, 21 ... Breakage Part, 25 ... second breakage detecting element, 26 ... bottomed cylindrical member, 26a ... open end, 27 ... telescopic member

Claims (5)

It is operatively connected to a plurality of guide vanes (2,...) That adjust the amount of water flowing into the water turbine in the radial direction according to the opening, and is generated when foreign matter is caught in the guide vanes (2). In the weak pin breakage detection device for detecting that the weak pin (20) having the breakage portion (21) broken by the load is broken,
A detection fluid supply section (11) for storing a predetermined amount of detection fluid;
Broken portion of the weak point pin (20) and the conduit axially weakness pin (20) so as to traverse (21) first breakage detection device having a (12a) (12),
A supply tube (15) for hermetically connecting the detection fluid supply section (11) and the conduit (12a) of the first breakage detection element (12) ;
A bottomed cylindrical member (26) inserted axially into the weak pin (20) across the broken portion (21) of the weak pin (20), and contracted so that the inside is in a negative pressure state. A weak pin breakage detection device comprising: a second breakage detection element (25) having an expansion / contraction member (27) airtightly connected to the open end (26a) of the bottomed tubular member (26). .   The first breakage detection element (12) is provided on each weak pin (20,...), And the first breakage detection element (12) is connected to the detection fluid supply part (11) via the supply tube (15). ,... Are connected in series, and the weak pin breakage detection device according to claim 1. Said elastic member (27), so as to protrude from the weaknesses pin (20) upon expansion, according to claim 1 or 2, characterized in that inserted into the axially weakness pin (20) in a contracted state The weak pin breakage detection device described in 1. The bottomed cylindrical member of the second breakage detection device (25) (26), according to claim 1 to 3, characterized in that inserted into the pipeline of the first breakage detection device (12) (12A) in the axial direction The weak point pin breakage detection apparatus of any one of these . In the weak pin breakage detection device for detecting that the weak pin (20) having the breakage portion (21) broken by the load is broken,
A detection fluid supply section (11) for storing a predetermined amount of detection fluid;
Broken portion of the weak point pin (20) and the conduit axially weakness pin (20) so as to traverse (21) first breakage detection device having a (12a) (12),
A supply tube (15) for hermetically connecting the detection fluid supply section (11) and the conduit (12a) of the first breakage detection element (12) ;
A bottomed cylindrical member (26) inserted axially into the weak pin (20) across the broken portion (21) of the weak pin (20), and contracted so that the inside is in a negative pressure state. A weak pin breakage detection device comprising: a second breakage detection element (25) having an expansion / contraction member (27) airtightly connected to the open end (26a) of the bottomed tubular member (26). .

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