Turbine turning gear engagement system and method

Abstract

The turbine turning gear engagement system, the engagement method and the turbine turning gear are provided, the system comprises a turning gear, a driving mechanism, an elastic buffer and a starting control loop; the elastic buffer is connected with the turning gear and the driving mechanism respectively, the starting control loop is used for controlling the engagement rotation degree of the turbine turning gear; when the elastic buffer is in a first compression position, the starting control loop controls the turning gear to start and run for a preset time and then stop running, so that the turning gear completes initial engagement at a gentle rotation speed; when the elastic buffer is in a second compression position, the starting control loop controls the turning gear to start again, so that the turning gear completes target engagement at a normal rotation speed. Through the cooperation of the elastic buffer and the starting control loop, the turbine turning gear rotation speed is started at a low speed in stages at the initial engagement stage, the engagement is smoother, the engagement impact force is reduced, the engagement gear of the turbine turning gear is protected, and the stable realization of the engagement is ensured.

Description

Technical Field

[0001] This disclosure pertains to the field of turbine turning gear technology, specifically relating to a turbine turning gear meshing system and meshing method. Background Technology

[0002] The turning gear system of a high-temperature gas-cooled reactor turbine uses a constant-speed motor to drive a meshing gearbox to achieve low-speed operation of the turbine after shutdown. This type of turning gear system uses compressed air to engage the turning gears. This operating mode of the turbine turning gear system generates significant impact forces, and prolonged operation may damage the turning gears on the turning gear and the turbine shaft turning gear. This can lead to meshing instability and automatic disengagement of the turning motor during later operation, resulting in unreliable turbine turning gear operation and ultimately, damage to the turbine.

[0003] To address the aforementioned problems, it is necessary to propose a reasonably designed and effective turbine turning gear meshing system and meshing method. Summary of the Invention

[0004] The present disclosure aims to at least solve one of the technical problems existing in the prior art, and to provide a turbine turning gear meshing system and meshing method.

[0005] One aspect of this disclosure provides a turbine turning gear engagement system, the system including a turning gear, a drive mechanism, an elastic buffer, and a start-up control circuit; The elastic buffer is connected to the turning gear device and the drive mechanism respectively, so as to compress the elastic buffer while the drive mechanism drives the turning gear device to move in the meshing direction. The starting control circuit is used to control the engagement speed of the turbine turning gear; wherein; When the elastic buffer is in the first compression position, the start control circuit controls the turning gear to start and run for a preset time before stopping, so that the turning gear can complete the initial engagement at a gentle speed. When the elastic buffer is in the second compression position, the start control circuit controls the turning gear to start again so that the turning gear can complete the target engagement at normal speed.

[0006] Optionally, the system further includes a first limit switch and a second limit switch disposed on the elastic buffer; The first limit switch is used to close for a preset time and then open when the elastic buffer is detected to be compressed to the first compression position, so that the start control circuit is energized for the preset time and then de-energized. The second limit switch is used to close when the elastic buffer is detected to be compressed to the second compression position, so as to re-energize the start control circuit.

[0007] Optionally, the start control circuit includes a start relay and a first relay; The first relay is connected in series with both the starting relay and the first limit switch. The main contacts of the starting relay are connected to the turning gear and the power supply, respectively.

[0008] Optionally, the first relay is a time relay.

[0009] Optionally, the start-up control circuit may further include a second relay; The second relay is connected in parallel with the first relay, and the second relay is connected in series with the second limit switch and the starting relay respectively.

[0010] Optionally, when the elastic buffer is compressed to the first compression position, the tooth tip of the meshing gear of the turning device abuts against the tooth tip of the turbine main shaft turning gear. When the elastic buffer is compressed to the second compression position, the meshing gear of the turning device and the turning gear of the turbine shaft complete normal meshing.

[0011] Optionally, the preset time ranges from 1s to 2s.

[0012] Another aspect of this disclosure provides a method for engaging a turbine turning gear, employing the turbine turning gear engagement system described above, the method comprising: Based on the positions of the meshing gear of the turning device and the turning gear of the turbine shaft, the first compression position and the second compression position of the elastic buffer are obtained respectively. The start-up control circuit controls the engagement speed of the turbine turning gear according to the first compression position and the second compression position.

[0013] Optionally, the start-up control loop controls the engagement speed of the turbine turning gear according to the first compression position and the second compression position, including: When the elastic buffer is in the first compression position, the start control circuit controls the turning gear to start and run for a preset time before stopping, so that the turning gear can complete the initial engagement at a gentle speed. When the elastic buffer is in the second compression position, the start control circuit controls the turning gear to start again so that the turning gear can complete the target engagement at normal speed.

[0014] Another aspect of the present disclosure provides a turbine turning gear, including the turbine turning gear engagement system described above; or, engaging with the turbine shaft turning gear using the engagement method described above.

[0015] This disclosure discloses a turbine turning gear meshing system and method. The system transmits meshing force through the compression of an elastic buffer during meshing. Due to the slow increase in force after compression, the meshing impact force of the turbine turning gear gradually increases during meshing. In this process, the cooperation between the elastic buffer and the starting control circuit enables the turbine turning gear to start at low speed in stages during the initial meshing phase, resulting in smoother meshing, reduced meshing impact force, protection of the meshing gears, and stable meshing. Simultaneously, the use of an elastic buffer absorbs transient impact forces during system operation after compression, ensuring system stability. Furthermore, this system has low environmental requirements and minimal installation requirements, making it easier to install and modify traditional turning gears. The cooperation between the elastic buffer and the starting control circuit further reduces costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a turbine turning gear meshing system according to one embodiment of the present disclosure; Figure 2 This is a schematic flowchart of a turbine turning gear engagement method according to another embodiment of this disclosure. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solutions of the embodiments of this disclosure, the embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0018] like Figure 1 As shown, one aspect of this disclosure provides a turbine turning gear engagement system 100, the system including a turning gear 110, a drive mechanism 120, an elastic buffer 130 and a start control circuit (not shown in the figure).

[0019] The elastic buffer 130 is connected to the turning gear 110 and the drive mechanism 120 respectively, so as to compress the elastic buffer 130 while the drive mechanism 120 drives the turning gear 110 to move in the meshing direction.

[0020] It should be noted that in this embodiment, the elastic buffer 130 is a spring, but other elastic devices can also be used. This embodiment does not impose specific limitations and can be selected according to actual needs.

[0021] It should be further explained that, in this embodiment, the drive mechanism 120 is a meshing cylinder, which is moved by compressed air. The piston rod drives the turning device 110 to move in the meshing direction, and the turning device 110 compresses the elastic buffer 130 while moving.

[0022] The start-up control loop is used to control the engagement speed of the turbine turning gear.

[0023] When the elastic buffer 130 is in the first compression position, the start control circuit controls the turning gear 110 to start and run for a preset time before stopping, so that the turning gear 110 completes the initial engagement at a smooth speed.

[0024] When the elastic buffer 130 is in the second compression position, the start control circuit controls the turning gear 110 to start again, so that the turning gear 110 completes the target engagement at normal speed.

[0025] It should be noted that when the elastic buffer 130 is compressed to the first compression position, the tooth tip of the meshing gear of the turning device 110 abuts against the tooth tip of the turning gear of the turbine shaft.

[0026] When the elastic buffer 130 is compressed to the second compression position, the meshing gear of the turning gear 110 and the turning gear of the turbine shaft are properly meshed.

[0027] It should be further noted that in this embodiment, the preset time ranges from 1s to 2s. Preferably, the preset time is 1s. That is, when the elastic buffer 130 is in the first compression position, the start control circuit controls the turning gear device 110 to start and run for 1s before stopping, so that the turning gear device 110 completes the initial engagement at a smooth rotational speed. The range of the preset time can be set according to the actual operating conditions of the turning gear device, and this embodiment does not impose a specific limitation.

[0028] Specifically, upon receiving a turbine shutdown signal, the drive mechanism 120 drives the turning gear 110 to move in the meshing direction, while simultaneously compressing the elastic buffer 130. When the elastic buffer 130 is in the first compressed position, the tooth tip of the meshing gear of the turning gear 110 abuts against the tooth tip of the turbine main shaft turning gear. The start control circuit controls the turning gear 110 to start and run for a preset time before stopping. During this process, the drive mechanism 120 continues to drive the turning gear 110 in the meshing direction. After starting, the turning gear 110 begins to rotate. After running for a preset time, it stops and then rotates at a low speed due to inertia, achieving stable meshing between the meshing gear and the turbine main shaft turning gear. In other words, the turning gear 110 completes the initial meshing at a gentle rotational speed.

[0029] When the elastic buffer 130 is in the second compression position, the meshing gear of the turning gear 110 engages normally with the turning gear of the turbine shaft. During this process, the drive mechanism 120 drives the turning gear 110 to continue moving in the meshing direction, and the start control circuit controls the turning gear 110 to start again, so that the turning gear 110 completes the target meshing at normal speed, and realizes the normal operation of the turning gear 110.

[0030] The turbine turning gear meshing system of this embodiment transmits meshing force through the compression of an elastic buffer during meshing. Due to the slow increase in force after compression of the elastic buffer, the meshing impact force of the turbine turning gear gradually increases during meshing. In this process, the cooperation between the elastic buffer and the starting control circuit enables the turbine turning gear to start at low speed in stages during the initial meshing phase, resulting in smoother meshing, reduced meshing impact force, protection of the meshing gears, and stable meshing. Simultaneously, the use of an elastic buffer absorbs transient impact forces during system operation after compression, ensuring system stability. Furthermore, this system has low environmental requirements and minimal installation requirements, making it easier to install and modify traditional turning gears; the combination of the elastic buffer and the starting control circuit further reduces costs.

[0031] For example, such as Figure 1 As shown, the system 100 also includes a first limit switch 140 and a second limit switch 150 disposed on the elastic buffer 130.

[0032] The first limit switch 140 is used to close for a preset time and then open after detecting that the elastic buffer 130 is compressed to the first compression position, so that the start control circuit is energized for a preset time and then de-energized. That is, the first limit switch 140 is connected to the start control circuit as a trigger structure for energizing or de-energizing the start control circuit.

[0033] It should be noted that in this embodiment, the first compression position is when the elastic buffer 130 is compressed to 1 / 2 of its total stroke. At this position, the tooth tip of the meshing gear of the turning device 110 just collides with the tooth tip of the turning gear of the turbine shaft.

[0034] Specifically, in this embodiment, when the elastic buffer 130 is compressed to half of its full stroke, the first limit switch 140 is triggered to close for 1 second and then open, and the corresponding start control circuit is energized for 1 second and then de-energized. That is to say, when the elastic buffer 130 is compressed to half of its full stroke, the turning gear 110 starts running for 1 second and then stops running, so that the turning gear 110 completes the initial engagement at a smooth speed.

[0035] The second limit switch 150 is used to close when the elastic buffer 130 is detected to be compressed to the second compression position, so as to re-energize the start control circuit.

[0036] It should be noted that in this embodiment, the second compression position is when the elastic buffer 130 is compressed to 4 / 5 of its full stroke. At this position, the meshing gear of the turning device 110 and the turning gear of the turbine shaft are in normal mesh.

[0037] Specifically, in this embodiment, when the elastic buffer 130 is compressed to 4 / 5 of its full stroke, the second limit switch 150 is triggered to close, and the corresponding start control circuit is energized. That is, when the elastic buffer 130 is compressed to 4 / 5 of its full stroke, the turning gear 110 restarts, so that the turning gear 110 completes the target engagement at normal speed, thereby realizing the normal operation of the turning gear 110.

[0038] The turbine turning gear meshing system of this embodiment reduces the turning motor speed at the beginning of operation by setting a first limit switch and a second limit switch on the elastic buffer and using the control method of the first limit switch and the second limit switch in conjunction with the start control circuit, thereby reducing the impact force of the turbine turning gear, protecting the meshing gear of the turbine turning gear, and ensuring the operational stability of the turning gear.

[0039] For example, the start control circuit includes a start relay 160 and a first relay 170, with the first relay 170 connected in series with both the start relay 160 and the first limit switch 140. The main contacts 161 of the start relay 160 are connected to both the turning gear 110 and the power supply. The start relay 160 is used to control the start and stop of the turning gear 110.

[0040] Specifically, in this embodiment, when the elastic buffer 130 is compressed to the first compression position, the first limit switch 140 closes, the first relay 170 closes for 1 second and then opens, and the corresponding starting relay 160 is energized for 1 second and then de-energized, causing the main contact 161 of the starting relay 160 to close for 1 second and then open, thus realizing that the turning gear 110 runs for 1 second and then disconnects. During this process, the drive mechanism 120 drives the turning gear 110 to continue moving in the meshing direction. The turning gear 110 achieves low-speed rotation through inertia, realizing stable meshing between the turning gear of the turning gear and the turbine main shaft turning gear.

[0041] It should be noted that, in this embodiment, the first relay 170 can be a time relay. A preset time can be set on the timer according to actual conditions; for example, in this embodiment, the time relay can be set to close for 1 second before opening.

[0042] For example, such as Figure 1As shown, the start control circuit also includes a second relay 180, which is connected in parallel with the first relay 170, and the second relay 180 is connected in series with the second limit switch 150 and the start relay 160 respectively.

[0043] Specifically, in this embodiment, when the elastic buffer 130 is compressed to the second compression position, the second limit switch 150 is closed, the second relay 180 is closed, and the corresponding start relay 160 is energized, which drives the main contact 161 of the start relay 160 to close, thereby enabling the turning gear 110 to operate, so that the turning gear 110 can complete the target engagement at a normal speed, thus realizing the normal operation of the turning gear 110.

[0044] When the steam turbine starts, as the turbine speed rises to a level higher than the turning gear speed (generally >4 rpm), the turning gear moves in the disengagement direction under the action of centrifugal force. The second limit switch 150 is disconnected, the second relay 180 is disconnected, and the turning gear motor is automatically stopped.

[0045] The turbine turning gear engagement system in this embodiment, through the cooperation of elastic buffers, switches, and relays, makes the turning gear operation more stable and reduces costs. Furthermore, this system has low environmental requirements and simple installation requirements, making it easier to install and modify traditional turning gears.

[0046] Another aspect of this disclosure provides a turbine turning gear engagement method S100, which employs the turbine turning gear engagement system 100 described above. The specific structural features of the turbine turning gear engagement system 100 have been described in detail above and will not be repeated here.

[0047] The turbine turning gear engagement method S100 of this disclosure includes: S110. Based on the positions of the meshing gear of the turning device and the turning gear of the turbine shaft, obtain the first compression position and the second compression position of the elastic buffer.

[0048] S120, The starting control circuit controls the engagement speed of the turbine turning gear according to the first compression position and the second compression position.

[0049] First, when the elastic buffer 130 is in the first compression position, the control circuit is activated to control the turning gear 110 to start and run for a preset time before stopping, so that the turning gear 110 completes the initial engagement at a smooth speed.

[0050] Specifically, when the elastic buffer 130 is compressed to the first compression position, the first limit switch 140 closes, the first relay 170 closes for 1 second and then opens, and the corresponding starting relay 160 is energized for 1 second and then de-energized, causing the main contact 161 of the starting relay 160 to close for 1 second and then open, thus realizing that the turning gear 110 runs for 1 second and then disconnects. During this process, the drive mechanism 120 drives the turning gear 110 to continue moving in the meshing direction. The turning gear 110 achieves low-speed rotation through inertia, realizing stable meshing between the turning gear of the turning gear and the turbine main shaft turning gear.

[0051] Secondly, when the elastic buffer 130 is in the second compression position, the start control circuit controls the turning gear 110 to start again, so that the turning gear 110 completes the target engagement at normal speed.

[0052] Specifically, in this embodiment, when the elastic buffer 130 is compressed to the second compression position, the second limit switch 150 is closed, the second relay 180 is closed, and the corresponding start relay 160 is energized, which drives the main contact 161 of the start relay 160 to close, thereby enabling the turning gear 110 to operate, so that the turning gear 110 can complete the target engagement at a normal speed, thus realizing the normal operation of the turning gear 110.

[0053] The turbine turning gear engagement method of this disclosure transmits engagement force through the compression of an elastic buffer during engagement. Due to the slow increase in force after compression of the elastic buffer, the engagement impact force of the turbine turning gear gradually increases during engagement. In this process, the cooperation between the elastic buffer and the starting control circuit enables the turbine turning gear to start at low speed in stages during the initial engagement, resulting in smoother engagement, reduced engagement impact force, protection of the meshing gears, and stable engagement. Simultaneously, the use of an elastic buffer absorbs transient impact forces during system operation after compression, ensuring system stability. Furthermore, this system has low environmental requirements and minimal installation requirements, making it easier to install and modify traditional turning gears; the cooperation between the elastic buffer and the starting control circuit further reduces costs.

[0054] Another aspect of this disclosure provides a turbine turning gear, including the turbine turning gear engagement system 100 described above. The specific structural features of this system have been described in detail above and will not be repeated here. Alternatively, the turbine turning gear engages with the turbine shaft turning gear using the engagement method S100 described above. The steps of this engagement method have been described in detail above and will not be repeated here.

[0055] The turbine turning gear of this embodiment achieves phased low-speed start-up of the turbine turning gear during the initial engagement stage through the cooperation of an elastic buffer and a starting control circuit. This results in smoother engagement, reduced engagement impact, protection of the meshing gears, and stable engagement. Simultaneously, the use of an elastic buffer absorbs transient impact forces during system operation after compression, ensuring system stability. Furthermore, this system has low environmental requirements and minimal installation requirements, making it easier to install and modify traditional turning gears. The combination of the elastic buffer and the starting control circuit further reduces costs.

[0056] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the embodiments of this disclosure, and the embodiments of this disclosure are not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the embodiments of this disclosure, and these modifications and improvements are also considered to be within the protection scope of the embodiments of this disclosure.

Claims

1. A turbine turning gear engagement system, characterized in that, The system includes a turning device, a drive mechanism, an elastic buffer, and a start-up control circuit; The elastic buffer is connected to the turning gear device and the drive mechanism respectively, so as to compress the elastic buffer while the drive mechanism drives the turning gear device to move in the meshing direction. The starting control circuit is used to control the engagement speed of the turbine turning gear; Upon receiving a turbine shutdown signal, the drive mechanism drives the turning gear to move in the engagement direction, simultaneously compressing the elastic buffer; wherein... When the elastic buffer is in the first compression position, the start control circuit controls the turning gear to start and run for a preset time before stopping, so that the turning gear completes the initial engagement at a gentle speed; wherein, when the elastic buffer is compressed to the first compression position, the tooth tip of the meshing gear of the turning gear abuts against the tooth tip of the turbine main shaft turning gear. When the elastic buffer is in the second compression position, the starting control circuit controls the turning gear to start again, so that the turning gear completes the target engagement at normal speed; wherein, when the elastic buffer is compressed to the second compression position, the meshing gear of the turning gear completes normal meshing with the turbine main shaft turning gear; wherein. The cooperation between the elastic buffer and the starting control circuit enables the turbine turning gear to start in stages at low speed during the initial meshing phase, resulting in smoother meshing, reduced meshing impact, protection of the meshing gears of the turbine turning gear, and stable meshing. The system further includes a first limit switch and a second limit switch disposed on the elastic buffer; the first limit switch is configured to close for a preset time and then open after detecting that the elastic buffer has been compressed to a first compression position, so that the start control circuit is energized for the preset time and then de-energized; the second limit switch is configured to close when detecting that the elastic buffer has been compressed to a second compression position, so that the start control circuit is re-energized; wherein... By using the control method of cooperating the first limit switch and the second limit switch with the start control circuit, the speed of the turning gear motor is reduced during the initial operation, thereby reducing the impact force of the turbine turning gear, protecting the meshing gears of the turbine turning gear, and ensuring the operational stability of the turning gear.

2. The system according to claim 1, characterized in that, The start control circuit includes a start relay and a first relay; The first relay is connected in series with both the starting relay and the first limit switch. The main contacts of the starting relay are connected to the turning gear and the power supply, respectively.

3. The system according to claim 2, characterized in that, The first relay is a time relay.

4. The system according to claim 2, characterized in that, The start-up control circuit also includes a second relay; The second relay is connected in parallel with the first relay, and the second relay is connected in series with the second limit switch and the starting relay respectively.

5. The system according to any one of claims 1 to 4, characterized in that, The preset time ranges from 1s to 2s.

6. A method for engaging a turbine turning gear, characterized in that, The method employs the turbine turning gear engagement system according to any one of claims 1 to 5, the method comprising: Based on the positions of the meshing gear of the turning device and the turning gear of the turbine shaft, the first compression position and the second compression position of the elastic buffer are obtained respectively. The start-up control circuit controls the engagement speed of the turbine turning gear according to the first compression position and the second compression position.

7. The method according to claim 6, characterized in that, The start-up control loop controls the engagement speed of the turbine turning gear according to the first compression position and the second compression position, including: When the elastic buffer is in the first compression position, the start control circuit controls the turning gear to start and run for a preset time before stopping, so that the turning gear can complete the initial engagement at a gentle speed. When the elastic buffer is in the second compression position, the start control circuit controls the turning gear to start again so that the turning gear can complete the target engagement at normal speed.

Images