JP2001221192A - Movable vane driving device in movable vane fluid apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a movable vane driving device in a movable vane fluid apparatus capable of using a small movable vane driving actuator having a small output by reducing a resistance of a screwing part in an advance/retreat moving mechanism. SOLUTION: The advance/retreat moving mechanism 11 is driven by an operation of the movable vane driving actuator 10, a thrust bearing device 8, a rotary cylindrical body 7, and a blade angle operating rod 6 are lifted up/down in an axial direction. The advance/retreat moving mechanism 11 is composed of three rotary shafts 16A to 16C which are disposed in parallel with an axis of the main shaft 1 and which are simultaneously rotated by an operation of the movable vane driving actuator 10, and three female screw comas 28A to 28C which are disposed integratedly with the bearing device 8, and which are provided with each female screw part 27 screwed around each male screw part 26 of the rotary shafts 16A to 16C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable blade drive device for a movable blade fluid device such as a pump, a water wheel or a blower having movable blades.

[0002]

2. Description of the Related Art Conventionally, a movable blade drive device of a movable blade vertical shaft pump configured to adjust the discharge water amount by changing the blade angle of an impeller blade is known as shown in FIGS. 4 and 5. FIG. I have. In this movable blade drive device, a hollow impeller boss 2 is fixed to a tip end of a hollow main shaft 1 rotatably supported by bearing means (not shown). The blade shafts 3 are rotatably supported at intervals in the circumferential direction, and the impeller blades 4 are fixed to protruding ends of the respective blade shafts 3 and 3 outside the impeller boss 2. An arm 3A attached to the insertion end of each of the blade shafts 3 and 3 in the impeller boss is connected to a blade movable mechanism 5 including a ball joint for changing the blade angle of the impeller blade 4 and a crosshead. A blade angle operating rod 6 having a tip connected to a movable mechanism 5 is inserted into a hollow portion of the main shaft 1 so as to be capable of moving in the axial direction of the main shaft 1 and simultaneously rotating by a slide key coupling (not shown). Simultaneously with the operating rod 6 and the spindle 1 The rotating cylinder 7 that rotates is connected to the blade angle control rod 6 and is arranged on the outer peripheral area of the main shaft 1. The rotating cylinder 7 is rotatably supported by a thrust bearing device 8, and the thrust bearing device 8 is connected to the main shaft 1. Are held by a cylindrical housing 9 so as to be able to move forward and backward in the axial direction.

On the other hand, a lower coupling 19A of a coupling 19 is provided at the upper end of the main shaft 1 via a key 18.
Are integrally connected to the lower coupling 19A by a fastening member formed of bolts and nuts (not shown), and the upper coupling 19B rotates the main shaft 1 with the upper coupling 19B. An output rotating shaft (not shown) of the driven pump motor is integrally connected.

The lower end of the lower coupling 19A has
The lower coupling 19A and the rotary cylinder 7 are inserted into the upper end opening of the rotary cylinder 7, and are integrally connected via a slide key 20 so as to be able to rotate simultaneously and to be able to move up and down the rotary cylinder 7. The rotating cylinder 7 is inserted concentrically into a cylindrical bearing case 23, and its lower small diameter portion is rotatably supported by the bearing case 23 by a bearing portion 22 formed of a thrust bearing. The thrust bearing device 8 is constituted by both of the bearing cases 23.

On the other hand, the small diameter portion at the upper end of the blade angle operating rod 6 is
The lifting plate 24 is attached to the small diameter portion of the upper end by a lock nut 25. The lifting plate 24 and the upper end flange portion of the rotary cylinder 7 are formed by a plurality of lifting bolts penetrating the lower coupling 19A. 17 and 17 are integrally connected.

Accordingly, the forward / backward moving mechanism 11 is driven in the forward or reverse direction by the operation of a movable blade drive actuator (not shown) in the forward or reverse direction, so that the thrust bearing device 8 and the rotary cylinder 7 and the blade angle operation are operated. By moving the rod 6 forward and backward in the axial direction of the main shaft 1, the impeller blade 4 held at the reference blade angle of 0 degree is rotated to the closing side (minus side) to reduce the discharge water amount, By rotating the impeller blade 4 held at the reference blade angle in degrees to the open side (plus side), it is possible to adjust the discharge water amount to be large.

[0007]

In the conventional movable wing drive device, the forward / backward movement mechanism 11 engages with the worm 12 which is rotationally driven by the operation of the movable wing drive actuator (not shown). 9, a worm wheel 13 rotatably held in such a manner as to be unable to move in the axial direction, a large-diameter female screw portion 14 provided on an inner peripheral surface of the worm wheel 13, and an outer periphery of a lower end portion of a bearing case 23 in the bearing device 8. And a large-diameter male screw portion 15 screwed with the large-diameter female screw portion 14. However, since the resistance of the threaded portion has a characteristic that increases as the diameter of the screw increases, the forward / backward movement mechanism 11 has a structure in which the large-diameter male screw portion 15 is screwed to the large-diameter female screw portion 14. In this case, the resistance of the threaded portion becomes extremely large.
For this reason, a large-sized movable wing drive actuator having a large output must be used, and there is a disadvantage that the apparatus cost and the running cost are increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem caused by a remarkable increase in the resistance of the threaded portion in the forward / backward movement mechanism. It is an object of the present invention to provide a movable wing drive device for a movable wing fluid device that enables use of a small movable wing drive actuator.

[0009]

In order to achieve the above-mentioned object, a movable blade driving device according to the present invention comprises a hollow impeller boss 2 fixed to the tip of a hollow main shaft 1 rotatably supported. , A plurality of blade shafts 3, 3 are rotatably supported at circumferential intervals, and an impeller blade 4 is fixed to the outside of the impeller boss 2 of each of the blade shafts 3, 3. ,
An arm 3A is fixed inside the impeller boss 2 of each of the blade shafts 3, 3, and this arm 3A is connected to a blade moving mechanism 5 for changing the blade angle of the impeller blade 4, and the arm 3A A blade angle control rod 6 having a leading end connected thereto is inserted into the hollow main shaft 1 so as to be able to advance and retreat in the axial direction and to be simultaneously rotatable, and a rotary cylinder 7 that rotates simultaneously with the blade angle control rod 6 and the hollow main shaft 1 is formed. The rotating cylinder 7 is connected to a blade angle operating rod 6 and is disposed in the outer peripheral region of the hollow main shaft 1. The rotating cylinder 7 is rotatably supported by a bearing device 8 provided to move forward and backward in the axial direction of the hollow main shaft 1. Movable in a movable wing fluid device provided with an advance / retreat moving mechanism 11 which is activated by the operation of the drive actuator 10 to advance / retreat the bearing device 8, the rotary cylinder 7 and the blade angle operating rod 6 in the axial direction of the hollow main shaft 1. In the wing drive, A plurality of rotation shafts provided in parallel with the axis of the hollow main shaft 1 and simultaneously rotated by the operation of the movable wing drive actuator 10 via a rotation transmission mechanism 33; A male screw portion provided on at least two rotating shafts of the shaft, and a female screw portion provided on the bearing device so as to be screwable with the male screw portions are provided.

[0010] The rotation transmitting mechanism 33 includes a pinion provided to be rotatable simultaneously with each of the at least two rotation shafts, and an internal gear that rotates while meshing with the pinions.

Further, the pinion is integrally connected to each of the at least two rotation shafts by a fastening friction force 34 of a tapered wedge fitting.

According to the first aspect of the present invention, the threaded portion of the advance / retreat moving mechanism is distributed to a plurality of locations of at least two male threads of the rotating shaft and at least two female threads threaded to the male threads. Since the screw diameter of each screwing portion is set small, the resistance of the screwing portion is reduced, and the bearing device, the rotary cylinder and the blade angle operating rod can be moved forward and backward in the axial direction of the main shaft. it can.

Further, according to the second aspect of the invention, the structure of the rotation transmitting mechanism can be simplified.

Further, according to the third aspect of the present invention,
In a state before the pinion is integrally coupled to each of the at least two rotating shafts by the fastening frictional force of the tapered wedge, the pinion is rotatable around the axis of the rotating shaft. By adjusting the pinion at an appropriate position, it is easy to adjust the screwing position of the female screw portion to the rotating shaft to be uniform, and after this adjustment, the pinion is rotated by the fastening frictional force of the tapered wedge fitting. Can be integrally joined.

[0015]

An embodiment of the present invention will be described below with reference to the drawings. Note that the same parts as those of the conventional example described with reference to FIGS. 4 and 5 are denoted by the same reference numerals, and redundant description will be omitted.

In FIG. 1 and FIG.
Reference numeral 1 denotes three female screw tops 28 provided with three rotary shafts 16A, 16B, and 16C, and female screw portions 27 that are screwed into the male screw portions 26 of the respective rotary shafts 16A, 16B, and 16C.
A, 28B, and 28C, and as a screwing structure of the male screw portion 26 and the female screw portion 27, a trapezoidal screw, a precision roller screw, a ball screw, or the like can be given.

The three rotating shafts 16A, 16B, 16C are:
Inside the cylindrical housing 9, it is erected rotatably at equal intervals in the circumferential direction parallel to the axis of the main shaft 1, and its upper end projects a little above the housing 9, and the pinion 29 has a taper described later. The ring-shaped wedges are integrally connected by the fastening frictional force.

The three rotating shafts 16A, 16B, 16C are:
The movable wing drive actuator 10 is simultaneously driven to rotate. That is, the movable wing drive actuator 10
Is transmitted to the drive shaft 16D by a gear train 30. The rotation of the drive shaft 16D is rotated by a pinion 29 which is integrally connected to an upper end of the drive shaft 16D → an internal gear 31 which rotates by meshing with the pinion 29. → transmitted to the three rotating shafts 16A, 16B, 16C through the transmission paths of the remaining three pinions 29, 29 which mesh with the internal gear 31 and rotate, and connect these rotating shafts 16A, 16B, 16C to the drive shaft 16;
Rotate simultaneously with D. The internal gear 31 is rotatably supported above the cylindrical housing 9 via an annular support member 32, and the internal gear 31 and the pinions 29, 29 constitute a rotation transmission mechanism 33 having a simple structure. ing.
Therefore, the drive shaft 16D functions as a drive member that is rotationally driven by the operation of the movable wing drive actuator 10, and the remaining three screw rods 16A, 16B, and 16C function as driven members.

On the other hand, the lower end of the bearing case 23 of the thrust bearing device 8 has a flange 2 projecting radially outward.
3A, the three female screw pieces 28A, 28B, 28C are attached through the flange 23A, and the three rotary shafts 16A, 1
The male screw portions 26 of 6B and 16C are screwed together.

On the other hand, three rotating shafts 16A, 16B, 16
The integral connection of the pinion 29 to the upper end of each C is made by the fastening frictional force of the tapered wedge fitting 34 shown in FIG. The tapering type wedge fitting 34 has an inner taper ring 35 having an outer tapered surface 35A having an upwardly reduced diameter and an outer tapered ring having an inner diameter tapered surface 36A having a downwardly increasing diameter which abuts against the outer tapered surface 35A. 36, a push ring 37 and a plurality of push bolts 3
8 (however, only one push bolt is shown in FIG. 3).

The inner taper ring 35 and the outer taper ring 36 are inserted into an annular recess 39 surrounded by the inner peripheral surface at the upper end of the pinion 29 and the outer peripheral surface at the upper end of each of the rotating shafts 16A, 16B, 16C. The plurality of push bolts 38 are attached to the outer peripheral flange portion 37 of the push ring 37.
The same number of through holes 37a as the plurality of push bolts 38 provided in A
And is screwed into the same number of screw holes 29A as the plurality of push bolts 38 provided at the upper end of the pinion 29,
The distal end surface of the pressing ring 37 is in contact with the upper end surface of the outer taper ring 36. Therefore, a plurality of push bolts 3
By pressing the outer taper ring 36 by the screwing of No. 8, a fastening frictional force is generated in the tapered wedge fitting 34, and the pinion 29 is integrally connected to the upper end of each of the rotating shafts 16A, 16B, 16C. it can.

In the above construction, the forward / backward moving mechanism 11 is driven in the forward or reverse direction by the forward or reverse operation of the movable blade drive actuator 10, so that the thrust bearing device 8, the rotary cylinder 7 and the blade angle operating rod are operated. By moving the blade 6 forward and backward in the axial direction of the main shaft 1 (up and down), the impeller blade 4 held at the reference blade angle of 0 degree is turned to the closing side (minus side) to reduce the discharge water amount. Open the impeller blade 4 held at the reference blade angle of 0 degree (the positive side)
To adjust the amount of discharged water to be large.

The forward / backward moving mechanism 11 has three rotating shafts 1.
6A, 16B, and 16C, and these rotating shafts 16A, 16
B, 16C Three female screw tops 28A, 28B, 28C provided with female screw portions 27 to be screwed into the male screw portions 26, respectively.
And three screw shafts 16A, 1
6B and 16C and three female screw pieces 28A, 28B and 28C are respectively distributed at three locations, and the screw diameter of each screwing portion is set small. The thrust bearing device 8, the rotary cylinder 7, and the blade angle operating rod 6 can be moved forward and backward in the axial direction of the main shaft 1 by reducing the resistance of the portion. For this reason, it is possible to use the small movable wing drive actuator 10 having a small output, and it is possible to greatly reduce the apparatus cost and the running cost.

The rotation of the drive shaft 16D, which is rotated by the operation of the movable wing drive actuator 10, is applied to the rotation transmission mechanism 3.
3 to the three rotating shafts 16A, 16B, 16C, and simultaneously rotate these rotating shafts 16A, 16B, 16C. Therefore, in an appropriate state avoiding tilt and rattling,
The thrust bearing device 8 can be raised and lowered smoothly. Therefore, a lateral force that causes the main shaft 1 and the blade angle control rod 6 to bend is not applied.

Further, the rotation transmitting mechanism 33 has a drive shaft 16D.
And the three gear shafts 16A, 16B, and 16C, and the pinion 29, and the internal gear 31 that rotates while meshing with the pinion 29, simplifying the structure of the rotation transmission mechanism 33. Can be

Further, since the pinion 29 meshing with the internal gear 31 is integrally connected to each of the rotating shafts 16A, 16B and 16C by the fastening frictional force of the tapering wedge fitting 34, the pinion 29 is formed into a tapering type. Due to the fastening frictional force of the wedge fitting 34, the rotating shafts 16A, 16B,
In a state prior to being integrally coupled to each of the shafts 16C, the pinion 29 is rotatable around the rotation shafts 16A, 16B, 16C. That is, a plurality of push bolts 38
Since the outer taper ring 36 is not pressed by the distal end surface of the press ring 37 in the state before the screw is screwed, no fastening friction force has yet been generated in the tapered wedge fitting 34. For this reason, the pinion 29 is
It is in a state where it can rotate around the axes of A, 16B and 16C. Therefore, the pinion 2 with respect to the internal gear 31
9 at an appropriate position, and rotate shafts 16A, 16A.
B, female screw top 28A for male screw part 26 of 16C,
Adjustment for setting the screwing positions of the female screw portions 27 of 28B and 28C uniformly becomes easy. After this adjustment, a plurality of push bolts 38 are screwed, and the outer taper ring 36 is pressed by the distal end surface of the push ring 37. By doing so, the pinion 29 can be integrally connected to the rotating shafts 16A, 16B, 16C by generating a fastening frictional force in the tapered wedge fitting 34.

In the above embodiment, one drive shaft 16D provided with no male screw, three rotary shafts 16A, 16B, 16C provided with male screw 26, and three female screw pieces 28A, 28B, 28C are provided. Is used, but has a structure using one drive shaft 16D, two or four or more rotation shafts provided with the male screw 26, and two or four or more female screw pieces of the same number as the rotation shafts. There may be. Further, a male screw may also be provided on one drive shaft 16D, and a female screw piece screwed with the male screw may be additionally provided. Furthermore, one drive shaft 16D is omitted, and three rotary shafts 1 provided with male threads 26 are provided.
Any one of the shafts 6A, 16B, and 16C (for example, the rotating shaft 16A) may be connected to the gear train 30 so that the rotating shaft 16A functions as a drive shaft with the male screw 26.

The bearing case 23 of the bearing device 8
The female screw pieces 28A, 28B, 28C are attached through the flange 23A provided at the lower end of the rotary shaft, and the male screw portions 26 of the three rotary shafts 16A, 16B, 16C are screwed into the female screw portions 27, respectively. Although described, the use of the female screw tops 28A, 28B, and 28C is omitted, and the same number of screw holes as the rotary shafts 16A, 16B, and 16C are provided through the flange 23A to form the female screw portion 27. 27 is the external thread 2 of the rotating shafts 16A, 16B, 16C
6 may be screwed together.

Further, the movable wing drive device in the movable wing fluid device according to the present invention is described using a pump, but the present invention is not limited to the pump alone, but is applied to a movable wing fluid device such as a water wheel or a blower. Is also applicable.

[0030]

As described above, since the movable wing drive device in the movable wing fluid device of the present invention is constituted,
The following special effects are achieved.

In the movable wing drive device for the movable wing fluid device according to the first aspect, the screw portions of the advance / retreat moving mechanism are dispersed at a plurality of positions, and the screw diameter of each screw portion is set small. By reducing the resistance of the threaded portion, the bearing device, the rotary cylinder, and the blade angle operating rod can be moved back and forth in the axial direction of the main shaft. Therefore, it is possible to use a small movable wing drive actuator having a small output, and it is possible to greatly reduce the apparatus cost and the running cost.

In the movable wing drive device for the movable wing fluid device according to the second aspect, the structure of the rotation transmitting mechanism can be simplified.

In the movable wing drive device for a movable wing fluid device according to the third aspect, a plurality of pinions are meshed with the internal gear at an appropriate position, and a screw of the female screw coping with a plurality of rotary shafts having external threads is provided. The adjustment for setting the combined position evenly becomes easy.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a half sectional vertical sectional view showing an example of a tapering wedge fitting.

FIG. 4 is a longitudinal sectional view of a conventional example.

FIG. 5 is a perspective view partially showing an example of a relationship between a blade moving mechanism, a blade shaft, an impeller blade, and a blade angle operating rod.

[Explanation of symbols]

 Reference Signs List 1 hollow main shaft 2 hollow impeller boss 3 blade shaft 3A arm 4 impeller blade 5 blade moving mechanism 6 blade angle operating rod 8 thrust bearing device (bearing device) 10 movable blade drive actuator 11 advance / retreat moving mechanism 16A rotating shaft 16B rotating shaft 16C Rotary shaft 16D Drive shaft 26 Male thread 27 Female thread 29 Pinion 31 Internal gear 33 Rotation transmission mechanism 34 Tapered wedge fitting

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16H 25/20 F16H 25/20 A

Claims (3)

[Claims] A plurality of blade shafts are rotatably supported at circumferential intervals through a hollow impeller boss fixed to the tip of a rotatably supported hollow main shaft, An impeller blade is fixed outside the impeller boss of each of the blade shafts, and an arm is fixed inside the impeller boss of each of the blade shafts, and the arm changes the blade angle of the impeller blade. A wing angle operating rod having a tip connected to the wing movable mechanism is inserted into the hollow main shaft so as to be able to advance and retreat in the axial direction and to be simultaneously rotatable, and rotates simultaneously with the wing angle operating rod and the hollow main shaft. The rotating cylinder is connected to the blade angle control rod and is disposed in the outer peripheral region of the hollow main shaft. The rotating cylinder is rotatably supported by a bearing device provided to be able to advance and retreat in the axial direction of the hollow main shaft. For operation of wing drive actuator A movable wing drive device in a movable wing fluid device having an advance / retreat movement mechanism for starting and moving the bearing device, the rotary cylinder body and the wing angle operating rod in the axial direction of the hollow main shaft, wherein the advance / retreat movement mechanism is A plurality of rotating shafts provided in parallel with the axis of the hollow main shaft and simultaneously rotating by the operation of the movable wing drive actuator via a rotation transmitting mechanism; and at least two rotating shafts of the plurality of rotating shafts. A movable wing drive device for a movable wing fluid device, comprising: a male screw portion provided; and a female screw portion provided in the bearing device so as to be screwable with the male screw portion. 2. The apparatus according to claim 1, wherein the rotation transmission mechanism includes a pinion provided on each of the at least two rotation shafts so as to be simultaneously rotatable, and an internal gear that meshes with the pinions and rotates. Item 7. A movable wing drive device in the movable wing fluid device according to Item 1. 3. The pinion according to claim 2, wherein the pinion is integrally connected to each of the at least two rotating shafts by a fastening frictional force of a tapered wedge fitting.
7. A movable wing drive device in the movable wing fluid device according to 5. above.