CN211009170U

CN211009170U - Steam turbine and motor combined driving system

Info

Publication number: CN211009170U
Application number: CN201921852911.1U
Authority: CN
Inventors: 刘良平; 邢智勇; 尹明辉
Original assignee: Hunan Taitong Energy Management Co ltd
Current assignee: Hunan Taitong Energy Management Co ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-07-14
Anticipated expiration: 2029-10-31

Abstract

The utility model provides a combined driving system of a steam turbine and a motor, which comprises a steam turbine, a speed reducer, an automatic synchronous clutch, a non-return mechanism, a motor and a driven machine; the steam turbine, the speed reducer, the automatic synchronous clutch, the non-return mechanism, the motor and the driven machinery are arranged through a coupler. The utility model provides a joint drive system can effectively solve the problem that load machinery reversal influences the steam turbine safe operation, realizes still can the safe operation under the reversal operating mode.

Description

Steam turbine and motor combined driving system

Technical Field

The utility model relates to a drive unit protection equipment technical field, concretely relates to steam turbine, motor combined drive system.

Background

With the maturity of industrial steam turbines and waste heat recovery technologies, low-grade steam produced by the waste heat recovery technology is used for driving the steam turbine, and then the rotary machinery is driven by the combination of the steam turbine and the motor to be more and more used in the industries of steel, metallurgy, chemical industry and the like. The safe and stable operation of the steam turbine and the motor combined driving unit is more and more important.

In the existing steam turbine and motor combined drive unit, two ways are generally adopted for connection between a steam turbine and a motor: one is directly connected by a coupler, and the other is an automatic synchronous clutch. When the steam turbine fails, the combined unit in the direct connection mode must be stopped, and the production must also be stopped. Thus, such systems cannot be used in a continuous operation environment. The automatic synchronous clutch is adopted, and when the output rotating speed at the turbine end is lower than that of the motor, the automatic synchronous clutch is disengaged; otherwise, the engagement is automatic. Therefore, the unit equipped with the automatic synchronous clutch is independently driven by the motor when the steam turbine is in failure or overhauled, and continuous production is not influenced.

Application number CN201610054194.2 discloses a backpressure machine and motor single-shaft combined drive connection structure, in the patent, the backpressure machine and the motor are coupled through an SSS clutch (i.e. an automatic synchronous clutch), when the steam turbine fails, the SSS clutch is automatically disengaged, and the function of the motor for driving the rotating machinery alone is not affected. Patent No. CN201120418572.3 discloses a combined drive unit of a main sintering exhaust fan turbine and a synchronous motor. In the patent, a speed change clutch (namely an automatic synchronous clutch acceleration and deceleration box structure) is adopted between the steam turbine and the main exhaust fan, and the purpose of automatic disengagement of the steam turbine when the steam turbine fails can be achieved. The above-mentioned patent that discloses, through adopting the automatic synchronization clutch, can both solve the steam turbine not influence the purpose of production when breaking down, but can not solve motor or load mechanical failure, especially the problem that load mechanical reversal influences the safe operation of steam turbine.

The turbine is endangered by the reversal. Because the driving steam turbine is generally a high-speed unit (>3000rpm), when the load machine drives the steam turbine to rotate reversely through the gearbox, the rotating speed of the steam turbine is often greater than 100rpm and far exceeds the turning speed of the steam turbine by 10 rpm. The reversal accident of steam turbine, light person damage the front and back bearing of steam turbine, thrust tile dish, and heavy person damages the blade of through-flow part, causes the damage of steam turbine rotor, and the loss is very big.

In addition, the output torque of the conventional steam turbine turning gear generally only considers the friction force of a shaft system, but does not consider the existence of the reaction force of a rotating machine, so that the steam turbine cannot be turned at all in the case of failure. The thermal state turbine rotor which can not be turned is easy to bend irreversibly when being static, so that the turbine rotor must be returned to a factory for correction, and the safe operation of the combined drive unit is influenced.

SUMMERY OF THE UTILITY MODEL

The not enough to prior art, the utility model provides a driving system is united to steam turbine, motor can effectively solve the problem that load machinery reversal influences the steam turbine safe operation, realizes still can the safe operation under the reversal operating mode.

In order to solve the technical problem, the utility model provides a following technical scheme:

on one hand, the utility model provides a steam turbine and motor combined driving system, which comprises a steam turbine, a reducer, an automatic synchronous clutch, a non-return mechanism, a motor and a driven machine;

the steam turbine, the speed reducer, the automatic synchronous clutch, the non-return mechanism, the motor and the driven machinery are arranged through a coupler.

Further, the non-return mechanism is a non-return device. The particular type of backstop installed is not limited.

Further, the backstop can be independently installed or integrated on any of the following components: a retarder, an automatic synchronizing clutch, an electric motor or a driven machine.

Further, the backstop is independently installed beside the speed reducer or connected in series between the automatic synchronous clutch and the motor through a coupler.

Furthermore, the non-return mechanism in the combined driving system is one or any one.

Further, the torque of the backstop must be not less than the opposing force to which the driven machine is subjected when it is stopped.

Further, the steam turbine is provided with a large-torque barring device, and the output torque of the large-torque barring device is not less than the sum of the reverse force received when the driven machine is stopped and the force of rotating parts such as the steam turbine, the motor and the coupling.

Further, the steam turbine barring device can overcome the resistance of a process system during normal production and keep low-speed barring.

Advantageous effects

Compared with the prior art, the utility model, following beneficial effect has:

the utility model provides a steam turbine, motor combined drive system through the combined action of automatic synchronizing clutch, holdback and barring gear, can prevent to damage the steam turbine because of unit trouble under the various accident situation, when guaranteeing the unit normal shut down simultaneously, the barring gear can overcome drive mechanical reaction, and the normal barring of drive steam turbine prevents that the steam turbine from damaging. By installing the automatic synchronous clutch, the automatic synchronous clutch is disengaged when the steam turbine fails, and the operation of the motor and the driven machinery is not influenced by the steam turbine failure. Besides a conventional automatic synchronous clutch, a backstop is also arranged on a shaft system to prevent the driving machine from reversing when the driving machine stops.

Drawings

FIG. 1 is an example of a reverse operating condition;

FIG. 2 is an example of a combined turbine and motor drive system implemented under the operating conditions of FIG. 1.

FIG. 3 is a schematic view of another combined turbine and motor drive system.

Detailed Description

The present invention will be described in further detail with reference to specific embodiments, but it should not be construed that the scope of the subject matter of the present invention is limited to the following examples.

The process equipment or devices not specifically noted in the following examples are conventional in the art; all reagents are commercially available.

Example 1

As in fig. 1, 2 fans are operated in parallel without a backup fan. And the first fan is a turbine motor driving unit. When the first fan system is stopped due to the failure of the fan or the motor, the second fan still operates due to the fact that production cannot be stopped, the inlet of the first fan is kept at negative pressure, and the first fan can be in a reverse working condition under the driving of the inlet negative pressure. The reverse rotation speed is influenced by the closing condition of the inlet and outlet valves of the fan and the full pressure of the fan.

Referring to fig. 2, a combined driving system of a steam turbine and a motor is provided, which comprises a steam turbine 1, a speed reducer 2, an automatic synchronous clutch 3, a non-return mechanism 6, a motor 5 and a driven machine 4;

the steam turbine 1, the speed reducer 2, the automatic synchronous clutch 3, the check mechanism 6, the motor 5 and the driven machinery 4 are arranged through a coupling 7; the motor 5 is embodied as a double output shaft, one end of the motor is connected with a driven machine 4 (namely a fan I) through a coupler 7, and the other end of the motor is connected with the steam turbine 1 through a speed reducer 2 and an automatic synchronous clutch 3; a check mechanism 6, i.e., a check, is installed on the turbine side of the automatically synchronized clutch 3.

In order to ensure that the operation of the fan I is not influenced by the fault of the steam turbine 1, an automatic synchronous clutch 3 is arranged between the steam turbine 1 and the motor 5; when the steam turbine 1 is in fault, the rotating speed of the steam turbine 1 is lower than the first rotating speed of the fan after being decelerated by the speed reducer 2, and the automatic synchronous clutch 3 is disengaged; the purpose of isolating the fault steam turbine 1 from the motor 5 and the fan I is achieved.

When the first fan fails, the first fan trips, the first fan is influenced by external counter force to stop at an accelerated speed, the automatic synchronous clutch 3 keeps meshed at the moment, and the steam turbine 1 stops at an accelerated speed under the action of the external counter force, so that the first fan has no influence on the unit.

When the fan stops rotating to the starting direction under the action of external counter force, the backstop mechanism 6 (backstop) acts to prevent the fan from reversing. The steam turbine 1, the motor 5 and the first fan are all kept in a static state.

In a stationary state, the automatic synchronizing clutch 3 can manually disengage the input shaft and the output shaft, so that the steam turbine 1 and the electric motor 5 are maintained in a disengaged state. At this time, the first fan or the steam turbine 1 can be independently repaired and maintained.

The utility model discloses an installation holdback guarantees when fan or motor trouble arouse that the steam turbine promptly parks, and the steam turbine can not receive the effect of reversal force and the reversal, arouses the steam turbine trouble.

Through the installation backstop, guarantee under the condition that there is the counter-rotating force to exist, the automatic synchronization clutch can manually disengage, conveniently overhauls the steam turbine or carries out the steam turbine and drives the experiment alone.

According to the conventional steam turbine barring device, the output torque only considers the resistance of a steam turbine generator rotor during low-speed barring, and the barring device is applied to a steam turbine motor combined driving unit, so that the accident is caused due to the fact that the output torque is often insufficient. Therefore, the barring device of the system considers the reversal force of the production process and ensures that the steam turbine can be successfully barring in the process production.

Example 2

Referring to fig. 3, a combined driving system of a steam turbine and a motor is provided, which comprises a steam turbine 1, a speed reducer 2, an automatic synchronous clutch 3, a non-return mechanism 6, a motor 5 and a driven machine 4;

the steam turbine 1, the speed reducer 2, the automatic synchronous clutch 3, the check mechanism 6, the motor 5 and the driven machinery 4 are arranged through a coupling 7; the motor 5 is embodied as a double output shaft, one end of the motor is connected with a driven machine 4 (namely a fan I) through a coupler 7, and the other end of the motor is connected with the steam turbine 1 through a speed reducer 2 and an automatic synchronous clutch 3; a check mechanism 6, i.e., a check is installed on the motor side of the automatic synchronizing clutch 3.

Example 3

The difference between the embodiment 1 and the embodiment 2 is that a high-torque turning gear is arranged on a steam turbine; in a conventional steam turbine barring device, the output torque only considers the resistance of a steam turbine generator rotor during low-speed barring, and the barring device is applied to a steam turbine and motor combined drive unit, so that the accident is caused due to the often insufficient output torque; therefore, the turning gear device on the system provided by the utility model considers the reverse force of the production process, ensures that the turbine can be smoothly turned in the process production, and the output torque of the turning gear device is not less than the sum of the reverse force received when the driven load is shut down and the force of the rotating parts such as the turbine and the motor; the barring device can overcome the resistance of a process system during normal production and keep low-speed barring.

It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be included in the scope of the invention.

Claims

1. A combined driving system of a steam turbine and a motor is characterized by comprising the steam turbine, a speed reducer, an automatic synchronous clutch, a check mechanism, the motor and a driven machine;

the steam turbine, the speed reducer, the automatic synchronous clutch, the motor and the driven machinery are sequentially arranged through the coupler;

the non-return mechanism is independently installed or integrated on any of the following components: a retarder, an automatic synchronizing clutch, an electric motor or a driven machine.

2. The combined turbine and motor drive system of claim 1, wherein the backstop mechanism is a backstop.

3. The combined turbine and motor drive system of claim 2, wherein the backstop is independently mounted next to the speed reducer or connected in series between the automatic synchronizing clutch and the motor through a coupling.

4. The combined turbine and motor drive system of claim 1, wherein the back stop mechanism is one or more than one.

5. The combined turbine and motor drive system of claim 2, wherein the torque of the backstop must be no less than the opposing force experienced when the driven machine is shut down.

6. The combined turbine and motor drive system of claim 1, wherein the turbine is configured with a high torque barring device, the output torque of the high torque barring device is not less than the sum of the reverse force received when the driven machine is stopped and the force of rotation of the turbine, motor and coupling.

7. The combined turbine and motor drive system of claim 6, wherein the high torque barring gear overcomes process system drag during normal production to maintain low speed barring.