JPS586078B2 - Blade angle control device for movable blade type fluid machinery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operating device for controlling the blade angle of a fluid machine such as a movable vane type axial flow pump, mixed flow pump, water turbine, or blower.

The drive devices for the operating shafts for controlling the blade angle in the fluid machines mentioned above are mostly hydraulic, but this hydraulic drive requires an external hydraulic supply device, making the entire device large-scale. Additionally, there was a problem with the pressure oil seal.

For this reason, mechanical operating devices are sometimes used to control the blade angle of relatively small fluid machines.

1 and 2 show a conventional example of this mechanical operating device.

Figure 1 shows a blade angle control operating shaft b inserted into a hollow cylindrical pump main shaft a, and an operating shaft b inserted through a long hole C provided in the main shaft a.
A wheel e integrally coupled with a pin d passing through the main shaft a is fitted on the outer periphery of the main shaft a so as to be slidable in the axial direction, and an outer ring g provided rotatably is operated via the wheel e and a bearing f. It can be operated in the axial direction by arm h.

Note that i is a crosshead fixed to the shaft end of operating shaft b, j is a pump blade, and k, l, and m are connecting members between crosshead i and blade j.

This device moves the operating shaft b up and down with respect to the main axis a as shown by the arrow B by operating the arm h as shown by the arrow A, and also controls the blade angle by rotating the blade j as shown by the arrow C. This device has a long hole C in the main shaft a of the pump.
Since such notches must be provided, there is a disadvantage that the strength of the pump main shaft a is reduced.

FIG. 2 also shows that an operating shaft b provided opposite the pump main shaft a is connected to the middle of an arm p, one end of which is pivoted to a casing n via a link 0, and the other end of the arm p is connected to an operating rod q. It is connected to.

This device controls the blade angle of the blade j by operating the operating rod q in the direction of arrow D and operating the operating shaft b in the direction of arrow E via arm p. Part of the operating mechanism is submerged in the water, making maintenance and inspection difficult. In addition, it is necessary to provide a long arm P and operating rod Q on the outside of the pump, which results in disadvantages such as increased installation space for the pump. be.

The present invention was made to solve the above-mentioned drawbacks of the conventional device, and allows the blade angle control operating device to be compactly housed within the casing without providing a notch in the main shaft and without providing a long arm or rod on the outside of the device. The purpose of this device is to provide a blade angle operating device that prevents the strength of the main shaft from deteriorating by storing it, is easy to maintain and inspect, and requires less installation space. The shaft is formed into a hollow cylindrical shape, and an operating shaft for controlling the blade angle is provided to pass through the main shaft, so that it rotates together with the main shaft on the outer periphery of the main shaft and can freely slide in the axial direction together with the operating shaft. Insert a sleeve into this sleeve. A cylindrical bearing box that is rotatable and slidable in the axial direction relative to the casing is attached via the bearing, and a worm wheel is screwed onto the outer periphery of the bearing box and is screwed into the worm wheel, which can be freely rotated on the casing. A worm screw shaft that engages with the worm wheel is rotatably provided in the casing, and the end of the operating shaft that protrudes from the main shaft at the joint between the main shaft and the drive shaft and the sleeve are connected to the crosshead and the drive shaft. They are connected together by a connecting rod, and a coupling is provided to enclose these connecting mechanisms.

An example embodiment of the present invention will be described below with reference to FIG.

In the figure, 1 is a main shaft of a movable vane type fluid machine, 2 and 3 are a casing, and 4 is a drive shaft.

In the present invention, the main shaft 1 is formed into a hollow cylindrical shape, and the operating shaft 5 for controlling the blade angle is slidably passed through the main shaft 1, and the end opposite to the drive shaft 4 has a cross section. The head 6 is fixed by a nut 7, and a connecting rod 8 parallel to the operating shaft 5 is fixed to one end of the crosshead 6 by a nut 9.

The main shaft 1 and the drive shaft 4 are connected by a coupling 10, the drive side coupling 10a is formed with a connection space S for the operation shaft so as to enclose the crosshead 6, and the driven side coupling 10b is formed by providing a connection space S for the operation shaft. The connecting rod 8 is passed through it, and its shaft cylindrical portion 10b' is extended a little longer.

In the figure, 11 is a key on the drive shaft side, 12 is a nut, 13 is a key on the main shaft 1 side, and 14 is a screw that connects the main shaft 1 and the upper plate of the coupling 10b.

Further, a flanged sleeve 15 is fitted onto the outer periphery of the shaft cylindrical portion 10b' of the coupling 10b so as to be slidable in the axial direction, and the lower end of the connecting rod 8 is screwed to the flanged portion of the sleeve 15.
A cylindrical bearing box 16 is fitted around the outer periphery of this sleeve 15 so as to be rotatable with the sleeve 15.

17 is a radial bearing interposed between the sleeve 15 and the bearing box 16, and 18 is a thrust bearing.

A thread 16a is formed on the outer periphery of the branched single-cylindrical bearing box 16, and a vertical groove 16c is formed on the outer periphery of the upwardly protruding cylindrical portion 16b.
A detent pin 1 is provided and engages with this vertical groove 16c.
9 is provided protruding from the casing 3.

Further, a worm wheel 20 that is screwed into the screw 16a on the outer circumference of the bearing box 16 is rotatably provided in the casing 3, and a worm screw shaft 21 that meshes with the worm wheel 20 is rotatably provided in the casing 3.

22 is a valve control (commercially available) for driving the worm screw shaft 21.

Next, the operation of the apparatus of the present invention constructed as described above will be explained.

When the drive shaft 4 rotates, the main shaft 1 of the fluid machine rotates via the coupling 10, and together with this, the operating shaft 5 and the sleeve 15 rotate together.

To control the blade angle, the worm screw shaft 21 may be rotated in a desired direction.

This operation can be performed automatically using the valve control 22 or the like, or the worm screw shaft 21 can be rotated manually.

Now, when the worm screw shaft 21 is rotated in the direction of the arrow F and the worm wheel 20 is rotated counterclockwise when viewed from above, the bearing box 16 moves upward as shown by the arrow G due to the action of the screw 16a. sleeve 15, connecting rod 8
, the operating shaft 5 also moves upward as shown by arrow H via the crosshead 6, changing the blade angle by that amount.

Moreover, when controlling the blade angle in the opposite direction, the direction of rotation of the worm screw shaft 21 may be reversed.

Since the device of the present invention is as described above, there is no need to provide a notch in the main shaft of the fluid machine unlike the conventional device, and there is no need to provide a long arm or rod outside the device.

Since the operating device for controlling the blade angle is compactly housed within the casing, the device of the present invention has the excellent effects of preventing a decrease in the strength of the main shaft, making maintenance and inspection easy, and requiring less installation space.

[Brief explanation of the drawings] Figures 1 and 2 are partial sectional views showing the conventional device;
The figure is a sectional view of the device of the present invention. DESCRIPTION OF SYMBOLS 1...Main shaft, 2, 3...Casing, 4...Drive shaft, 5...Operation shaft for blade angle control, 6...Crosshead, 8...Connecting rod, 10...
Coupling, 15... Sleeve, 16... Cylindrical bearing box, 16a... Screw, 20... Worm foil, 21... Worm screw shaft, 22... Valve control.

Claims (1)

[Claims] 1 The main shaft 1 of the movable vane type fluid machine is formed into a hollow cylindrical shape,
A coupling 10 that connects the main shaft 1 and the drive shaft 4 in a device in which a blade angle control operating shaft 5 is provided to penetrate the main shaft 1 and the operating shaft 5 is slid in the axial direction to adjust the blade angle. An operation shaft connection space S is provided between the driving side coupling 10a and the driven side coupling 10b, and the crosshead 6 is fixed with the end of the operation shaft 5 facing, and a crosshead 6 is slidably attached to the outer periphery of the main shaft 1. By fitting the sleeve 15 and providing the connecting rod 8 that connects the crosshead 6 and the sleeve 15 through the driven side coupling 10b, the operation shaft 5 and the sleeve 15 are integrated and rotated around the sleeve 15. A bearing box 16 is provided via bearings 17 and 18, and is freely movable with the sleeve 15 in the axial direction.
A blade of a movable airfoil type fluid machine, in which a worm wheel 20 is rotatably provided on a casing 3, and a worm screw shaft 21 that engages with the worm wheel 20 is rotatably provided on the casing 3. Corner operation device.