CZ300751B6 - Turning gear for turning machine rotors - Google Patents

Abstract

The present invention relates to a turning gear for turning machine rotors (2), especially steam or combustion turbine rotors (2), during down or incidence time of steam or combustion turbine. The gear comprises a transmission (3) with a driving motor and a reversing pump (1), which is provided with suction piping (7) and delivery piping (8), and which is connected either directly or via the transmission (3) with the machine rotor (2). A delivery piping (4) of an auxiliary pump (5), is connected via a shut-off and control valve (6) of auxiliary oil with the suction piping (7) of the reversing pump (1) whereas the delivery piping (8) of the reversing pump (1) is connected via a shut-off valve (9) of return oil with a main oil tank (11) in order to ensure the original direction of the machine rotor (2) rotation. For ensuring the reverse direction of the machine rotor (2) rotation, the delivery piping (4) of the auxiliary pump (5) is connected via a shut-off valve (16) with the delivery piping (8) of the reversing pump (1), whereas the suction piping (7) of the reversing pump (1) is connected via a shut-off valve (12) with the main oil tank (11).

Description

Technical field

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a rotary device for rotating machine rotors, in particular steam or internal combustion turbine rotors, during a standstill or start-up of a steam or internal combustion turbine, comprising a gearbox with drive motor and a reversing pump. via the gearbox or directly with the machine rotor.

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BACKGROUND OF THE INVENTION

Some equipment or machines that operate at a higher working fluid temperature, such as a steam or i5 combustion turbine, cannot be shut down from full power to zero speed, but the rotor must be kept at a minimum speed until the temperature of these machines has dropped to the permissible value.

Similarly, when starting these machines. If this procedure is not followed, there will be significant temperature deformations of the housing or rotor due to uneven cooling or heating, which could cause machine failure.

At present, rotation of rotors, in particular steam and combustion turbines, is provided by a spinning device consisting of a gearbox and a drive motor, most often an electric motor, which ensures a minimum rotor speed over the coupling, thereby ensuring uniform heating or cooling. . At this stage, the booster pump delivers the full amount of oil to the turbine, generator and gearbox bearings and to the gear teeth and for the control respectively.

With these so-called rotational speeds, minimal losses occur in the bearings, which is also reflected in the minimum power loss and the corresponding minimum oil consumption. The same applies to the consumption of gear oil lubrication. No oil is required for regulation when turning. This means that the standby pump is considerably oversized for this phase.

Another disadvantage of the existing solution is its complexity and hence the high price.

SUMMARY OF THE INVENTION

The aforementioned drawbacks are eliminated by a rotating device for rotating machine rotors, in particular of steam or combustion turbine rotors, during a standstill or start-up of a steam or combustion turbine, which consists of a gearbox with a drive motor and a reversing pump. according to the invention, in order to ensure the original sense of rotation of the machine rotor, the suction line of the reversing pump is connected via the auxiliary oil shut-off and control valve of the auxiliary pump, and the discharge line of the reversing pump is the return oil shut-off fitting is connected to the main oil tank by the waste oil line.

It is an object of the invention to ensure the opposite direction of rotation of the machine rotor that the discharge line of the booster pump is connected via a shut-off valve to the discharge line of the reversing pump, and the suction line of the reverse pump is connected to the main oil tank.

According to a preferred embodiment of the invention, a lubrication line is provided from the reversing pump provided with shut-off, control and return fittings, which is connected to the emergency pump.

In the spin phase, the excess pressure oil from the booster pump is used as a working fluid to drive the main pump, which is coupled to the turbine rotor and which at this stage operates in a motor-turbine mode, i.e., rotates the turbine rotor. Auxiliary pump oil can be introduced behind or, in the case of a gear pump, in front of the main pump, which directly affects the direction of rotation of the rotor. Turbine rotor speed can be controlled by oil pressure upstream of the main pump. All the oil from the emergency pump, or part of the oil from the auxiliary pump, is used for lubrication of the turbine, generator and gearbox. By utilizing the motor-turbine mode of the main pump, there is no need for a special spinning device which must also be used with standard turbines.

In the standard operating mode, the control and shut-off valves are set so that the main reversing pump supplies the system with the full amount of oil and the auxiliary pump is shut down.

BRIEF DESCRIPTION OF THE DRAWINGS

The attached figure schematically shows an exemplary embodiment of a connection for a turning device with a reversible pump and the necessary shut-off, control and safety fittings.

DETAILED DESCRIPTION OF THE INVENTION

The attached figure shows schematically the connection of a spinning device for spinning the rotors 2 of machines, in particular the rotors 2 of a steam or combustion turbine, during a shutdown or start-up of a steam or combustion turbine consisting of a reversing pump 1 connected via a gearbox 3 or directly connected to a rotor 2 Auxiliary pump discharge line 4 is connected via the auxiliary oil shut-off and control valve 6 to the suction line 7 of the main reversing pump 1 and the discharge line 8 of the main reversing pump 1 is connected via the waste oil shut-off valve 9 to waste oil line 10. This connection of the main reversing pump 1, as a motor, ensures the original sense of rotation of the rotor 2 of the rotating machine.

To ensure the opposite direction of rotation of the rotor 2 while the machine is spinning, the discharge line 4 of the auxiliary pump 5 is connected via the shut-off valve 16 to the discharge line 8 of the main reversing pump 1 and via the main reverse pump 1 and shut-off valve 12 with the oil tank 11.

The emergency pump is J3 for both directions of rotation. connected to the lubrication line 14 via respective shut-off, control and return valves.

This means that the auxiliary pump 5 provided with an electric drive is at this stage a source of pressure oil, both for the machine lubrication system and for the reversing pump 1. The control and shut-off valves are set in this phase to allow inlet and outlet The reversing pump I therefore operates in this circuit as a motor, utilizing the oil pressure energy and rotating the rotor 2 of the machine to ensure uniform cooling.

For pump operation of the reversing pump 1, the aforementioned fittings are reset to their original position.

Claims (3)

PATENT CLAIMS 5 1. Rotating equipment for rotating rotors ( (2) machines, in particular rotors (2) of steam or combustion turbines, for the shutdown or start-up of a steam or combustion turbine, consisting of a gearbox (3) with propulsion engine and a reversing pump (1) via a transmission (3) or directly to the machine rotor (2), characterized in that the suction line (7) of the reversing pump (1) is also connected to the auxiliary shut-off and control valve (6) of the auxiliary the discharge line (4) of the auxiliary pump (5) is connected, the discharge line (8) of the reversing pump (1) being connected via the return oil shut-off valve (9) to the main oil tank (11) for securing the original sense of rotation of the rotor (2) of the machine. 15 2. Spinning gear for spinning rotors (2) of machines, in particular rotors (2) of steam and combustion turbines, during a shutdown or start-up of a steam or combustion turbine, consisting of a gearbox (3) with propulsion engine and a reversing pump (1) is provided with a suction line (7) and a discharge line (4), which is connected via a gearbox (3) or directly to the machine rotor (2), characterized in that the discharge line (4) of the auxiliary pump (5) is connected via 20 a shut-off valve (16) with a discharge line (8) of the reversing pump (1), the suction line (7) of the reversing pump (1) being connected to the main oil tank (11) via the shut-off valve (12) rotor (2) machines. Spinning device according to claim 1 or 2, characterized in that it is of the reversing type 25 of the pump (1), a lubrication line (14) provided with shut-off, control and return fittings is connected to the emergency pump (13).