JP2002317606A - Turning device of rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance a safety by assembling an air clutch mechanism to a turning device and protecting the turning device against an abnormal rotation. SOLUTION: When a turbine rotor 1 is reversely rotated for some reason, a reverse rotation detection signal from a reverse rotation detecting machine 36 is fed to a solenoid valve 35, the solenoid valve is immediately closed to stop supply of air for operating an air clutch 21, whereby an air pressure is released. A drive ring 23 is returned to a left direction in a drawing by an expansion motion of an expansion spring 25 and a component force in an axial direction acting on first and second spline parts 24a and 24b, whereby the spline parts are cut and separated. As a result, a reverse rotation force of the turbine rotor is not transmitted to a turning rotor 13, thereby preventing a breakage of the motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turning device (low-speed rotating device) used when starting a rotating machine such as a turbine.

[0002]

2. Description of the Related Art FIG. 4 is an explanatory view showing a conventional example of a turning device for rotating a rotating machine such as a turbine at a low speed at the time of starting. A wheel gear 2 as a driven gear is attached to a turbine rotor 1. On the other hand, support frame 1
Output shaft 12 of turning motor 13 attached to
A first gear shaft 11 is mounted on the first gear shaft 11. The first gear shaft 11 is supported by bearings 15 to 15, and a bevel drive gear 10 is mounted thereon.

A bevel driven gear 9 and a spur tooth drive gear 7 which are always meshed with a bevel drive gear 10 are mounted on a second gear shaft 8 supported by bearings 5 to 5 and provided in parallel with the turbine rotor 1. . Third gear shaft 4 supported by bearings 5 to 5 and provided in parallel with turbine rotor 1
Is mounted with a spur tooth driven gear 6 which always meshes with a spur tooth drive gear 7, and a helical gear 3 which can be selectively engaged with the wheel gear 2 is slidably mounted in the axial direction.

In order to rotate the turbine rotor 1 with this turning device, first, the bevel gear 3 is moved from a position shown by a two-dot chain line to a meshing position shown by a solid line by an appropriate means, for example, a shift fork. 2 and the bevel gear 3 are meshed. Thereafter, by starting the turning motor 13, the turbine rotor 1 can be rotated at a low speed.

When the rotation speed of the turbine rotor 1 becomes higher than the rotation speed of the turning motor 13, the rotation is transmitted from the wheel gear 2 to the bevel gear 3, and a force is applied in a direction in which the bevel gear 3 is disengaged. 3 is disengaged from the wheel gear 2 and moves to the disengaged position (two-dot chain line position), and the operation of the turning device is completed.

[0006]

However, if the turbine rotor 1 rotates in the reverse direction for some reason while the turning device is rotating at a low speed, the turning motor 13
Are rotated in reverse at high speed, and as a result, the motor may be damaged.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a highly safe turning machine for a rotating machine that is not damaged even if the turbine rotor rotates abnormally.

[0008]

According to the first aspect of the present invention, a driven gear provided on a shaft of a rotary machine is connected via a transmission device including at least an output gear engageable with the driven gear. A turning device for a rotary machine, which is temporarily rotated and driven by a driving motor, wherein the transmission device is capable of engaging and releasing a transmission path of a driving force by supplying or stopping operation air. A turning device is provided that includes a clutch mechanism. According to the turning device configured as described above, engagement and release of the transmission path of the driving force are performed by supplying or stopping the operating air by the air clutch mechanism.

According to a second aspect of the present invention, there is provided a turning device according to the first aspect, wherein the output gear is a worm gear. According to the invention of claim 3, in the invention of claim 1, the air clutch faces in the axial direction,
Including two radial splines that are engageable with each other;
A turning device is provided in which one spline portion is constantly biased by a spring so as to be separated from the other spline portion.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. First, a first embodiment will be described with reference to FIGS. 1 and 2. In the first embodiment, an air clutch is incorporated in a gear shaft 4 of a turning device shown in FIG. Things. Therefore, the same members as those in the related art are denoted by the same reference numerals, and overlapping description will be omitted.

As shown in FIG. 1, in the first embodiment of the present invention, an air clutch 21 for interrupting power transmission is incorporated between the spur tooth driven gear 6 and the gear shaft 4, and the air clutch Operating air is supplied to the air conditioner 21 from an air pipe 34 via an electromagnetic valve 35. Further, a reverse rotation detector 36 for detecting reverse rotation is provided near the turbine rotor 1, and a reverse rotation detection signal from the reverse rotation detector 36 is sent to the electromagnetic valve 35.

FIGS. 2A and 2B are views for explaining the structure and operation of the air clutch 21. FIG. 2A shows a clutch off state, and FIG. 2B shows a clutch on state. On the right side in the figure, a boss portion 22 fixed to the spur tooth driven gear 6 is shown.
Is rotatably supported by a bearing 31, and a first spline portion 24a is provided at a left end portion thereof. On the other hand, the drive ring 23 is non-rotatably mounted on the gear shaft 4 so as to be slidable in the axial direction.
A spline portion 24b is provided, and the second spline portion 24b is constantly supplied with an urging force to push the clutch in the direction of disengaging the clutch (to the left in the drawing) by the elastic spring 25.

On the other hand, on the left side of the figure, a stationary piston 27 rotatably supports the gear shaft 4 via a bearing 33 on the inner diameter side, and a movable cylinder 26 slides outside the stationary piston 27 in the axial direction. It is movably fitted. O-rings 28 and 29 are provided on the sliding portion so that air leakage from gaps can be sealed.

An air introduction hole 30 is provided in the movable cylinder 26, and working air is supplied from the air pipe 34 to the air introduction hole 30 via a solenoid valve 35. A bearing 32 is provided between the movable cylinder 26 and the drive ring 23, and rotatably supports the drive ring 23. The configuration other than the above is the same as that of the conventional example shown in FIG.

According to the turning device for a rotary machine configured as described above, to start the turbine rotor 1, first, the bevel gear 3 is moved from the position indicated by the two-dot chain line to the position indicated by the solid line. Then, the wheel gear 2 and the bevel gear 3 are meshed. Then, the operating air is supplied from the pipe 34 to the air introduction hole 30 of the air clutch 21 via the electromagnetic valve 35 to apply air pressure to the space 30a, and as shown in FIG. 32, the drive ring 23 is pushed rightward in the drawing, and the second spline portion 24b of the drive ring 23 is engaged with the first spline portion 24a of the boss portion 22 in a clutch-on state.

When the turning motor 13 is started after the above operation, the driving force of the turning motor 13 is transmitted to the bevel drive gear 10, bevel driven gear 9, gear shaft 8, spur tooth drive gear 7, and spur tooth driven gear 6. The torque is transmitted to the boss portion 22, the first spline portion 24a, the second spline portion 24b, the drive ring 23, and the gear shaft 4 of the air clutch 21, and further transmitted to the turbine rotor via the helical gear 3 and the wheel gear 2. 1 is rotated at low speed. When the rotation speed of the turbine rotor 1 increases, as described in the related art, the bevel gear 3
Comes off the wheel gear 2.

On the other hand, if the turbine rotor 1 rotates in the reverse direction before the bevel gear 3 is disengaged from the wheel gear 2 for some reason, a reverse rotation detection signal from the reverse rotation detector 36 is sent to the solenoid valve 35, Immediately, the solenoid valve 35 is closed, and the supply of the operating air to the air clutch 21 is stopped.
The air pressure of a disappears.

Then, the drive ring 23 is instantaneously pushed back to the left in the drawing by the extension operation of the expansion / contraction spring 25 and the axial component acting on the first and second spline portions 24a and 24b, and as shown in FIG. ) And the clutch is off. As a result, the reverse rotation force of the turbine rotor 1 is not transmitted to the turning motor 13, and the turning motor 13 is not rotated abnormally and is prevented from being damaged.

Next, a second embodiment will be described with reference to FIG. In the second embodiment, the output gear that engages with the wheel gear 1 is a worm gear 41, and the boss portion 22 of the air clutch 21 is coupled with a driven wheel 42 instead of a driven gear. , The motor 1 through the endless chain 44
The third embodiment differs from the first embodiment in that the air clutch 21 is engaged with the drive wheel 45 attached to the air clutch 21.
The other parts such as the internal structure are the same as those of the first embodiment.

According to the turning device for a rotary machine configured as in the second embodiment, to start the turning device, first, the worm gear 41 is fitted from the two-dot chain line position to the solid line position. (Not shown) to fit the wheel gear 2 and the worm gear 41 together.

Thereafter, when the turning motor 13 is started, the driving force (torque) from the turning motor 13 is transmitted from the transmission wheel 43 of the driving system via the endless chain 44 to the transmission wheel 42 and the air clutch 21.
Is transmitted to The air clutch 21 operates in the same manner as in the first embodiment, the torque from the transmission wheel 42 is transmitted to the gear shaft 4, and the worm gear 4
1, transmitted to the wheel gear 2 to rotate the turbine rotor 1 at a low speed.

On the other hand, for some reason, the turbine rotor 1
Is rotated in the reverse direction, the reverse rotation detection signal from the reverse rotation detector 36 is sent to the solenoid valve 35, the supply of the operating air to the air clutch 21 is stopped, and the operating air supplied to the air clutch 21 is stopped. Is discharged from the pipe 34a, and the reverse rotation force of the turbine rotor 1 is not transmitted to the turning motor 13 in the air clutch 21 as in the first embodiment, and abnormal rotation of the motor 13 is avoided to prevent damage. Can be prevented. In addition, the same operation and effect as those of the first embodiment can be obtained.

[0023]

According to the invention described in each claim, the driven gear provided on the shaft of the rotary machine is driven by a driving motor via a transmission device including at least an output gear engageable with the driven gear. A turning device for a rotary machine that is temporarily driven to rotate, but includes an air clutch mechanism in which a transmission device can engage and disengage a driving force transmission path by supplying or stopping operation air. In addition, engagement and release of the drive force transmission path can be performed by supplying or stopping the operating air by the air clutch mechanism. Therefore, transmission of the reverse rotational force of the turbine rotor to the motor can be instantaneously interrupted, and damage to the motor can be prevented.

[Brief description of the drawings]

FIG. 1 is a diagram showing a turning device for a rotary machine according to the present invention.

FIGS. 2A and 2B are enlarged views of an air clutch section of the turning device of the present invention, wherein FIG. 2A shows a state in which the clutch is released, and FIG. 2B shows a state in which the clutch is engaged.

FIG. 3 is an explanatory diagram of a turning device for a rotary machine according to a second embodiment.

FIG. 4 is a view showing a conventional turning device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Turbine rotor 2 ... Wheel gear 3 ... Bevel gear 4, 8 ... Gear shaft 13 ... Turning motor 21 ... Air clutch 24a, 24b ... First and second spline part 35 ... Solenoid valve 41 ... Worm gear

Claims (3)

[Claims] 1. A driven gear provided on a shaft of a rotating machine is temporarily rotated by a driving motor via a transmission device including at least an output gear engageable with the driven gear. A turning device for a rotary machine, wherein the transmission device includes an air clutch mechanism capable of engaging and releasing a transmission path of a driving force by supplying or stopping operation air. 2. The turning device according to claim 1, wherein the output gear is a worm gear. 3. The air clutch includes two radially facing spline portions that face each other in an axial direction and are engageable with each other, and one of the spline portions is constantly biased by a spring so as to be separated from the other spline portion. The turning device according to claim 1, wherein: