JP2020023890A - Movable blade pump device and blade adjustment method - Google Patents

Abstract

To provide a movable blade pump device enabling optimal operation for a setting flow without adjusting a flow rate with a discharge valve regardless of an installation condition of a pump.SOLUTION: A movable blade pump device having a plurality of movable blades whose blade angles can be changed, comprises: a strain gauge 36 as a pressure detection mechanism capable of detecting a pressure difference between fluid on a pressure surface 33a side and fluid on a suction surface 33b side of at least one movable blade 33 of a plurality of movable blades 33; and a blade angle operating mechanism that can simultaneously adjust and control the blade angles of the plurality of movable blades 33 based on the pressure difference detected by the strain gauge 36.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a movable blade pump device having a plurality of movable blades whose blade angles can be changed, and a blade angle adjusting method.

  BACKGROUND ART A movable blade pump device having a plurality of movable blades whose blade angles can be changed is used for an axial mixed flow pump used for river water, clean water, agricultural water, a circulating water pump of a power plant, and the like.

  Since the discharge amount can be arbitrarily controlled by adjusting the blade angle during operation of the movable blade pump device, the pump can be operated with higher efficiency in a wider flow rate range than the fixed blade pump, and the shaft power can be reduced. The blade angle refers to an angle formed by a chord line of the movable blade and a plane orthogonal to the rotation axis of the impeller.

  As an example of a movable blade pump device, Patent Literature 1 discloses a vertical mixed flow pump. The vertical mixed-flow pump has a cone provided with a main shaft and movable blades whose blade angle can be controlled, and a pressure difference between a suction side of the movable blade and a discharge side of the movable blade in a cylinder disposed in the cone. Thus, the reciprocating motion of the reciprocating piston and the movable wing are interlocked.

JP 2013-92070 A

  However, the vertical mixed flow pump disclosed in Patent Document 1 changes the blade angle so that the difference from the discharge pressure becomes constant when the suction pressure changes due to fluctuations in the water level on the suction side, etc. Since the discharge amount changes in accordance with the discharge amount, it is necessary to adjust the opening and closing of the discharge valve in order to obtain a predetermined discharge amount. At this time, when the pressure on the discharge side changes, the blade angle changes again so that the difference from the suction pressure becomes constant. Therefore, it is considered that the opening and closing adjustment of the discharge valve is repeated until the optimal pump operation state is reached, and that complicated control is required.

  The present invention has been made in view of the above-described problems, and does not perform flow rate adjustment by a discharge valve, and to a set flow rate, regardless of installation conditions of a pump, a movable blade pump device capable of optimal operation. An object of the present invention is to provide a blade angle adjusting method.

  In order to achieve the above object, a characteristic configuration of the movable blade pump device according to the present invention is a movable blade pump device having a plurality of movable blades whose blade angles can be changed, and at least one of the plurality of movable blades. A pressure detection mechanism capable of detecting the pressure difference between the fluid on the pressure surface side and the fluid on the suction surface side of one movable blade, or capable of detecting each pressure of the fluid on the pressure surface side and the fluid on the suction surface side, A blade angle operating mechanism capable of individually or simultaneously adjusting the blade angles of the plurality of movable blades based on the pressure difference or each of the pressures detected by the pressure detecting mechanism. is there.

  According to the above-described configuration, after operating at the standard blade angle according to the flow rate, the blade angle is adjusted so that the pressure difference between the fluid on the pressure surface side and the fluid on the suction surface side of the movable blade is minimized, that is, By performing the adjusting operation so that the movable blade faces the inflow angle, efficient operation can always be performed at the flow rate at that time. As a result, a reduction in electricity consumption can also be achieved. Note that the blade angle before the start of operation may be set as appropriate. For example, before starting the operation of the movable blade pump device, the blade angle may be minimized, and an adjustment operation may be performed such that the blade angle is gradually optimized with the operation of the movable blade pump device.

  The pressure detecting mechanism includes a strain gauge and a pressure sensor provided on a pressure surface and a suction surface of the movable wing, respectively, and a thickness direction of the movable wing in a through hole provided in the movable wing and passing through the movable wing in a thickness direction. And a flow sensor capable of detecting a flow rate and a direction of a fluid flowing through the through hole and a strain gauge disposed along an imaginary plane intersecting with the sensor. The pressure detection mechanism may be provided on at least one movable wing.

  The blade angle operation mechanism may be configured to be able to adjust the blade angle based on the pressure difference between the fluid on the pressure surface side and the fluid on the suction surface side of one movable blade detected by the pressure detection mechanism, The blade angle may be adjustable based on a pressure difference calculated from each pressure of the fluid on the pressure surface side and the fluid pressure on the suction surface side detected by the detection mechanism. At this time, if the blade angle operating mechanism is configured to be capable of individually adjusting and operating the blade angles of the plurality of movable blades, it is possible to realize an optimum blade angle for each movable blade, If the wing angles of the wings are configured to be able to be adjusted at the same time, the mechanism related to the wing angle adjustment operation can be simplified.

  The blade angle operation mechanism is configured to be able to adjust and operate the blade angle of the movable blade by a hydraulic or mechanical actuator. The blade angle operation mechanism may be configured to be operated manually by an operator, or may be configured to be automatically operated based on a predetermined program or the like.

  In the present invention, it is preferable to include a control mechanism for controlling the blade angle operation mechanism.

  According to the above configuration, the control mechanism can automatically operate the blade angle operation mechanism based on the pressure difference detected by the pressure detection mechanism or the like. Not required.

  In the present invention, the pressure detection mechanism intersects with the thickness direction inside a through hole that passes through the movable wing provided in at least one of the plurality of movable wings in the thickness direction. It is preferable that it is constituted by a strain gauge arranged along the virtual plane.

  According to the above configuration, the pressure detecting mechanism is constituted by a strain gauge, and the strain gauge is disposed inside the movable wing, thereby directly detecting the pressure difference between the fluid on the pressure surface side and the fluid on the negative pressure surface side. be able to. In addition, if the through-hole is provided in advance when the movable wing is formed by casting, subsequent cutting or the like becomes unnecessary.

  In the present invention, the through hole has a surface opening area, which is an opening area on each surface of the pressure surface and the negative pressure surface, smaller than an internal opening area, which is an opening area of a portion where the strain gauge is disposed. It is suitable.

  If the openings on each of the pressure surface and the suction surface are large, there is a possibility that resistance to the fluid flowing on the pressure surface side or the suction surface side of the movable blade may occur, and there is a possibility that foreign matter may be caught, which is not preferable. The openings in the surfaces of the pressure surface and the suction surface only need to be able to flow the fluid. On the other hand, inside the through-hole, a sufficient space is required for disposing the strain gauge. Therefore, the above-described configuration is preferably adopted. Thereby, on the surface of the movable wing, the through hole for measuring the pressure of the fluid does not become the resistance of the fluid, and there is no danger of foreign matter being caught in the through hole. Can be sufficiently secured.

  In the present invention, the pressure detecting mechanism may include a tip portion of the movable wing on a tip end side in a rotation direction, a tip portion of the movable wing on a tip side of a rotation direction, a corner portion on a tip end of the movable wing, It is preferable that the movable wing is provided at at least one of a corner on the front end side in the rotational direction and a corner on the boss side of the movable wing and on the rear end in the rotational direction.

  The pressure detection mechanism is located on the tip side of the movable wing on the front end side in the rotational direction, on the tip side of the movable wing on the rear end side in the rotational direction, and on the boss side of the movable wing in the rotational direction. Is provided at at least one of the front end corner and the boss side of the movable wing and the rear end corner in the rotational direction, the fluid on the pressure side of the movable wing and the suction side The pressure difference of the fluid can be detected, or the respective pressures of the fluid on the pressure surface side and the fluid on the negative pressure surface side can be detected.

  Cavitation is most likely to occur at the corner on the front end side in the rotation direction. Therefore, it is preferable that the pressure detection mechanism is provided at least at the tip side of the movable wing and at the corner on the front end side in the rotation direction. Cavitation can be prevented from occurring by controlling the movable wing such that the pressure difference at the corner on the front end side in the rotation direction of the movable wing is reduced.

  The more the pressure detection mechanism is installed, the more the movable blade can be viewed as a whole, and the blade angle with the highest pump efficiency can be realized.

  In order to achieve the above-described object, a characteristic configuration of a wing angle adjusting method according to the present invention is a wing angle adjusting method in a movable wing pump device having a plurality of movable wings whose wing angles can be changed. A pressure detecting step of detecting a pressure difference between a fluid on a pressure surface side and a fluid on a suction surface side of at least one of the movable blades, or a pressure of the fluid on the pressure surface side and a pressure on the suction surface side. And a blade angle adjusting step of individually or simultaneously adjusting the blade angles of the plurality of movable blades based on the pressure difference or the respective pressures detected by the pressure detecting step. It is in.

  According to the above-described configuration, the blade angle is optimized so that the pressure difference between the fluid on the pressure surface side and the suction surface side of the movable blade, which changes with the flow rate variation, is minimized. By performing the adjustment operation as opposed to the above, efficient operation can always be performed. As a result, a reduction in electricity consumption can also be achieved. Note that the blade angle before the start of operation may be set as appropriate. For example, before starting the operation of the movable blade pump device, the blade angle may be minimized, and an adjustment operation may be performed such that the blade angle is gradually optimized with the operation of the movable blade pump device.

  In the pressure detecting step, the thickness of the movable wing is set in a through hole that penetrates the movable wing in the thickness direction through a strain gauge or a pressure sensor provided on each of the pressure surface and the suction surface of the movable wing. The pressure or the pressure difference may be detected from a strain gauge disposed along a virtual plane intersecting the direction or a flow rate sensor capable of detecting the flow rate and direction of the fluid flowing through the through hole. In the pressure detecting step, it is sufficient that the pressure or the pressure difference in at least one movable wing can be detected.

  The blade angle operation step may be configured such that the blade angle can be adjusted based on the pressure difference between the fluid on the pressure surface side and the fluid on the suction surface side of one movable blade detected in the pressure detection step, The blade angle may be adjustable based on a pressure difference calculated from each pressure of the fluid on the pressure surface side and the pressure on the suction surface side detected in the detection step. At this time, if the blade angle operation step is configured so that the blade angles of a plurality of movable blades can be individually adjusted and operated, an optimum blade angle can be realized for each movable blade, and a plurality of movable blades can be realized. If the wing angles of the wings can be adjusted at the same time, the wing angle adjustment operation can be simplified.

  The blade angle operation step is configured such that the blade angle of the movable blade can be adjusted and controlled by a hydraulic or mechanical actuator. The blade angle operation step may be a mode in which it is manually operated by an operator, or may be a mode in which it is automatically operated based on a predetermined program or the like.

  In the present invention, it is preferable that in the pressure detecting step, the pressure difference is detected at a plurality of positions on the movable wing.

  In the pressure detecting step, by detecting a pressure difference at a plurality of positions of the movable blade, it is possible to realize a blade angle with the highest pump efficiency when viewing the entire movable blade as a whole.

Schematic diagram of a movable blade pump device according to the present invention Illustration of wing angle control mechanism Explanatory view of the impeller viewed from the upstream side Explanatory drawing of pressure detection mechanism Explanatory drawing of a movable wing according to another embodiment

  Hereinafter, a movable blade pump device and a blade angle adjusting method according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows a movable blade pump device 1. The movable blade pump device 1 includes a vertical shaft mixed flow pump 10, a blade angle operation mechanism 40 for adjusting the blade angle of the movable blade 33 of the impeller 13 provided in the vertical shaft mixed flow pump 10, and a blade angle operation mechanism. 40 control mechanism 50.

  The vertical mixed flow pump 10 includes a main shaft 12 rotatably disposed in a casing 11, an impeller 13 provided at a lower end portion of the main shaft 12, and integrally rotating with the main shaft 12, and is provided continuously above the casing 11. A pumping pipe 14, a discharge curved pipe 15 connected to the upper side of the pumping pipe 14, a suction casing 16 connected to a lower side of the casing 11, and a discharge pipe 17 connected to a downstream side of the discharge bent pipe 15. And

  The casing 11 is provided with guide vanes 18 downstream of the impeller 13. The guide blade 18 is provided to rectify the fluid discharged from the impeller 13 in the axial direction and smoothly guide the fluid to the pumping pipe 14.

  A base plate 25 made of an annular steel plate is fixed to a mounting seat 23 which is positioned and fixed to an opening 21 of a floor portion 20 of the building by an anchor bolt 22 via a waterproof rubber (not shown). The discharge curved pipe 15 is fixed to the base plate 25.

  A water sealing mechanism (not shown) around the main shaft 12 and a bearing mechanism 26 for supporting the main shaft 12 are provided on the upper part of the discharge curved pipe 15, and the upper end of the main shaft 12 is provided with a coupling 29 as a shaft coupling. Via an output shaft 31 of a motor 30 mounted on a gantry 28 fixed to the base plate 25.

  As shown in FIG. 3, the impeller 13 includes a boss 32 fixedly supported by the main shaft 12 and a plurality of movable blades 33 arranged around the boss 32.

  The boss portion 32 is provided with a main shaft fixing portion 32a that supports the main shaft 12 at the center, and a support shaft holding portion 32b around which a support shaft 39 of the movable wing 33 described later can be loosely inserted. The boss 32 is made of a material having strength and corrosion resistance to fluid, such as stainless steel and gray cast iron.

  The movable wing 33 has a support shaft 39 integrally formed at the base end. The movable wing 33 and the support shaft 39 are made of a material having strength and corrosion resistance to fluid, such as stainless steel or gray cast iron.

  As shown in FIGS. 3 and 4, a thickness of the movable wing 33 at the tip side of the one movable wing 33 of the plurality of movable wings 33 of the impeller 13 at the front end side in the rotation direction is set. A through hole 34 penetrating in the direction is provided. Further, a lateral hole 35 communicating with the through hole 34 is formed in the movable wing 33 along a direction intersecting the thickness direction of the movable wing 33.

  From the side hole 35, a strain gauge 36 is disposed inside the through hole 34 along a virtual plane intersecting the thickness direction of the movable wing 33. Both longitudinal edges of the strain gauge 36 are fixed to opposing side surfaces of the lateral hole 35, respectively.

  The through hole 34 has an opening along the direction intersecting the thickness direction of the lateral hole 35 where the strain gauge 36 is disposed, the surface opening area being the opening area on each surface of the pressure surface 33a and the suction surface 33b. It is smaller than the internal opening area, which is the area.

  On the surface of the movable wing 33, the through-hole 34 for measuring the pressure of the fluid does not become a resistance of the fluid, and there is no danger of foreign matter being caught in the through-hole 34. The arrangement space for the gauge 36 can be sufficiently ensured.

  Inside the movable wing 33, there is provided a communication hole 37 for communicating the lateral hole 35 and the boss 32, and a lead wire 38 of a strain gauge 36 is passed through the communication hole 37. The communication holes 37 and the lead wires 38 are not shown in FIG. The lead wire 38 passes through the inside of the main shaft 12 (the main shaft 12 is hollow as described later) and is connected to a control mechanism 50 via a rotary connection connector or the like as appropriate (see FIG. 1). ).

  It is preferable that the through hole 34, the lateral hole 35, and the communication hole 37 are provided in advance when the movable wing 33 is formed by casting. The through hole 34, the lateral hole 35, and the communication hole 37 may be formed by cutting after the movable wing 33 is cast.

  The pressure of the fluid on the pressure surface 33a side of the movable wing 33 acts on one surface of the strain gauge 36 disposed inside the through hole 34 as described above, and the other surface of the strain gauge 36 The pressure with the fluid on the side of the negative pressure surface 33b of the blade 33 acts, and the strain gauge 36 generates a strain in accordance with the pressure difference. The control mechanism 50 directly detects a resistance change due to the generated strain as a pressure difference between the fluid on the pressure surface 33a side and the fluid on the negative pressure surface 33b side of the movable blade 33. Therefore, the strain gauge 36 is the pressure detecting mechanism according to the present invention.

  The blade angle operation mechanism 40 adjusts the blade angle of the movable blade 33, and changes the blade angle of the movable blade 33 to change the discharge amount. The blade angle operation mechanism 40 is configured as follows.

  As described above, the boss 32 is provided at the tip of the main shaft 12 rotatably supported by the bearing mechanism 26. Note that the main shaft 12 and the boss portion 32 are hollow.

  A plurality of support shafts 39 penetrate the hollow boss 32 and are rotatably supported by support shaft holding portions 32b at circumferential intervals. An arm 41 is attached to an end of the support shaft 39 inserted into the boss 32. The arm 41 is connected to the head 43 via a joint 42.

  The lower end of a blade angle control rod 44 movably along the axial direction of the main shaft 12 and arranged to rotate with the main shaft 12 is connected to the inside of the hollow main shaft 12 to the head 43.

  An actuator 45 for moving the blade angle operating rod 44 along the axial direction of the main shaft 12 is disposed at the upper end of the blade angle operating rod 44. The actuator 45 is constituted by a hydraulic mechanism. Specifically, a piston 46 is connected to the upper end of the blade angle control rod 44, and the piston 46 is disposed inside a hydraulic servo cylinder 47 that rotates together with the main shaft 12.

  Pressure oil from a hydraulic supply mechanism 49 is supplied to and discharged from the oil chamber of the hydraulic servo cylinder 47 via a direction control valve 48, whereby the blade angle operating rod 44 moves up and down along the axial direction of the main shaft 12. Operated. The head 43 connected to the lower end of the wing angle operating rod 44 moves up and down with the vertical movement of the wing angle operating rod 44, and the arm 41 is tilted in conjunction with this, and the support shaft connected to the arm 41 is held. As the part 32b rotates, the support shaft 39 rotates, so that the blade angle of the movable wing 33 is changed.

  The control mechanism 50 includes a microcomputer and a peripheral device such as a memory storing a program executed by the microcomputer, and is connected to a lead wire 38 of a strain gauge 36 as a pressure detecting mechanism. The control mechanism 50 executes a predetermined program based on the pressure difference detected by the strain gauge 36 to control the blade angle operation mechanism 40, that is, by controlling the hydraulic pressure supply mechanism 49 and the direction control valve 48, thereby controlling the movable blade. The blade angle of 33 is configured to be adjusted.

  When the pressure difference between the pressure of the fluid on the pressure surface side of the movable blade 33 and the pressure of the fluid on the suction surface side, which is detected by the strain gauge 36, becomes higher than a predetermined value, the control mechanism 50 controls the blade angle. By controlling the operation mechanism 40, the blade angle of the movable blade 33 of the impeller 13 is changed so that the pressure difference becomes small, preferably zero. Thereby, the collision of the fluid against the movable wings 33 is reduced, the separation of the flow is eliminated, and the shaft power is reduced.

  In this manner, the control mechanism 50 optimizes the blade angle so that the pressure difference between the fluid on the pressure surface side and the fluid on the suction surface side of the movable blade 33 is minimized, that is, adjusts the movable blade so that the movable blade faces the inflow angle. The operation always enables efficient operation. As a result, a reduction in electricity consumption can also be achieved. Note that the blade angle before the start of operation may be set as appropriate. For example, before the operation of the movable blade pump device 1 is started, the blade angle can be minimized, and an adjustment operation can be performed such that the blade angle is gradually optimized with the operation of the movable blade pump device 1. .

  In the above-described embodiment, a case has been described in which the pressure detection mechanism is provided on the tip side of the movable wing 33 and at the corner on the front end side in the rotation direction. This is because cavitation is most likely to occur in the movable wing 33 at the corner of the tip of the movable wing 33 on the front end side in the rotation direction. Cavitation can be effectively prevented from occurring by controlling the movable vanes so that the pressure difference at the corners is reduced.

  However, as shown in FIG. 5, the strain gauge 36 serving as a pressure detecting mechanism is provided at the tip side of the movable wing and at the corner at the front end in the rotational direction, at the tip side of the movable wing 33 and at the rear end in the rotational direction. May be provided at the corner on the side, the boss side of the movable wing 33 on the front end side in the rotation direction, or the boss side of the movable wing on the rear end side in the rotation direction. Further, the strain gauges 36 may be provided at a plurality of positions among the above-described four positions. As the number of places where the strain gauges 36 are installed increases, the blade angle with the highest pump efficiency can be realized when the entire movable blade 33 is viewed comprehensively.

  In the above-described embodiment, a case has been described in which one of the plurality of movable wings 33 is provided with the pressure detecting means. However, the present invention is not limited to this. Each of the plurality of movable wings 33 may be provided with a pressure detection unit.

  In the above-described embodiment, the description has been given of the case where the blade angle operating mechanism 40 is configured to be able to simultaneously adjust and operate the blade angles of the plurality of movable blades 33 while being a simple mechanism. However, the present invention is not limited to this. The blade angle operation mechanism 40 may be configured so that the blade angles of the plurality of movable blades 33 can be individually adjusted and operated. In particular, as described above, this is effective in the case where each of the plurality of movable wings 33 is provided with a pressure detecting unit. If the blade angle operation mechanism 40 is configured so that the blade angles of a plurality of movable blades can be individually adjusted and operated, an optimum blade angle can be realized for each movable blade 33.

  In the above-described embodiment, the configuration in which the strain gauge as the pressure detecting mechanism is disposed inside the through-hole has been described, but the present invention is not limited to this. The strain gauge may be configured to be attached to the surface of the pressure surface or the suction surface of the movable wing 33. The strain on the pressure surface and the suction surface of the movable wing 33 is detected by a strain gauge. Since these strains are generated as a result of the fluid on the pressure surface side and the fluid on the suction surface side acting on the movable blade 33, by measuring these strains, the pressure of the fluid on the pressure surface side of the movable blade 33 and the suction surface The pressure of the fluids on the side, and thus their difference, will be detected indirectly.

  Further, the pressure detection mechanism is not limited to the case where the pressure gauge is constituted by the strain gauge 36, and may be constituted by a flow rate sensor capable of detecting the flow rate and direction of the fluid passing through the through hole 34. Since the fluid flows due to the pressure difference between the fluid on the pressure surface side and the fluid on the suction surface side of the movable blade 33, the pressure difference can be indirectly detected by measuring the flow rate of the fluid.

  In the above-described embodiment, the case where the blade angle operation mechanism 40 is configured to be capable of adjusting the blade angle of the movable blade 33 by a hydraulic actuator is described. However, the present invention is not limited to this. The blade angle operating mechanism 40 may be configured to be capable of adjusting the blade angle of the movable blade 33 by moving the blade angle operating rod 44 up and down by a mechanical actuator having a worm gear and a screw mechanism.

  In the above-described embodiment, a configuration has been described in which the blade angle operating mechanism 40 is automatically operated by the control mechanism 50 executing a predetermined program or the like based on the detected pressure difference. Not exclusively. The blade angle operation mechanism 40 may be configured to be manually operated by an operator based on the detected pressure difference.

  In the movable blade pump device 1 configured as described above, the blade angle adjusting method according to the present invention is suitably executed.

  That is, the blade angle adjusting method is a blade angle adjusting method in the movable blade pump device 1 having a plurality of movable blades 33 whose blade angles can be changed, and is a method of adjusting at least one movable blade 33 among the plurality of movable blades 33. A pressure detecting step for detecting a pressure difference between the fluid on the pressure surface 33a side and the fluid on the negative pressure surface 33b side, or a pressure detection step for detecting each pressure of the fluid on the pressure surface 33a side and the fluid on the negative pressure surface 33b side; A blade angle adjusting step of individually or simultaneously adjusting the blade angles of the plurality of movable blades 33 based on the difference or each pressure. At this time, it is preferable that the pressure detecting step is configured to detect a pressure difference at a plurality of positions of the movable wing 33.

  The movable blade pump device 1 includes the vertical shaft mixed flow pump 10 and the configuration in which the blade angle of the movable blade 33 of the impeller 13 provided in the vertical shaft mixed flow pump 10 can be adjusted is described. Absent. The movable blade pump device 1 includes, for example, a vertical axial flow pump, a horizontal mixed flow pump, or a horizontal axial flow pump, and the blade angle of the movable blade of an impeller provided in these pumps can be adjusted. It may be.

  Each of the above-described embodiments is an example of the present invention, and the present invention is not limited to the description, and the specific configuration of each unit can be appropriately changed and designed within a range in which the operation and effect of the present invention is exerted. is there.

1: movable blade pump device 10: vertical shaft mixed flow pump 13: impeller 33: movable blade 33a: pressure surface 33b: negative pressure surface 34: through hole 35: side hole 36: strain gauge 37: communication hole 38: lead wire 40: blade Angle operating mechanism 50: Control mechanism

Claims (7)

A movable blade pump device having a plurality of movable blades whose blade angles can be changed,
The pressure difference between the fluid on the pressure surface side and the fluid on the suction surface side of at least one of the plurality of movable blades can be detected, or the respective pressures of the fluid on the pressure surface side and the fluid on the suction surface side can be detected. A detectable pressure detection mechanism,
A blade angle operating mechanism capable of individually or simultaneously adjusting the blade angles of the plurality of movable blades based on the pressure difference or each of the pressures detected by the pressure detection mechanism. Pump device.   The movable blade pump device according to claim 1, further comprising a control mechanism that controls the blade angle operation mechanism.   The pressure detection mechanism is arranged along a virtual plane intersecting with the thickness direction inside a through-hole passing through the movable wing provided in at least one of the plurality of movable wings in the thickness direction. The movable blade pump device according to claim 1, comprising a strain gauge arranged.   4. The through hole according to claim 3, wherein a surface opening area, which is an opening area on each surface of the pressure surface and the negative pressure surface, is smaller than an internal opening area, which is an opening area of a portion where the strain gauge is arranged. 5. Movable wing pump device.   The pressure detection mechanism is located on the tip side of the movable wing on the front end side in the rotation direction, on the tip side of the movable wing on the rear end side in the rotation direction, on the boss side of the movable wing. 5. The movable wing is provided at at least one of a corner on the front end side in the rotation direction and a boss side of the movable wing and on a rear end side in the rotation direction. 6. 3. The movable blade pump device according to claim 1. A blade angle adjusting method in a movable blade pump device having a plurality of movable blades whose blade angles can be changed,
A pressure for detecting a pressure difference between a fluid on the pressure surface side and a fluid on the suction surface side of at least one of the plurality of movable blades, or a pressure for detecting each pressure of the fluid on the pressure surface side and the fluid on the suction surface side. A detection step;
A blade angle adjustment step of individually or simultaneously adjusting the blade angles of the plurality of movable blades based on the pressure difference or the respective pressures detected in the pressure detection step. Method.   7. The blade angle adjusting method according to claim 6, wherein the pressure detecting step detects the pressure difference at a plurality of positions of the movable blade.

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