Quick vacuum breaking pipeline valve

Abstract

The utility model relates to the technical field of steam turbines, and discloses a rapid vacuum breaking pipeline valve which comprises a steam turbine steam exhaust device and a vertical pipeline, a communicating hole is formed in the top of the steam turbine steam exhaust device, the diameter of the communicating hole is 108 mm, a vacuum breaking main pipeline is arranged at the top of the steam turbine steam exhaust device, and the diameter of the vacuum breaking main pipeline is 10 mm. The pipe diameter of the vacuum breaking main pipeline is 108 mm, one end of the vacuum breaking main pipeline is fixedly connected with the communicating hole, the other end of the vacuum breaking main pipeline vertically and upwards extends to the 8-meter platform, and the other end of the vacuum breaking main pipeline is fixedly connected with the top end of the vertical pipeline through an elbow pipe. Through the design of the vacuum breaking main pipeline with the large pipe diameter of 108mm, the time for breaking vacuum of the steam turbine to be increased from-0.06 MPa to 0 MPa is only 15-20 minutes which is shortened by 25-30 minutes compared with the time before transformation, it is guaranteed that the rotating speed of the steam turbine can be rapidly decreased when the steam turbine is shut down or breaks down, and the problems of bearing bush abrasion, rotor overheating and the like caused by overlong idle running time are solved.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine technology, and more specifically to a rapid vacuum breaking pipeline valve. Background Technology

[0002] The original design of the vacuum breaking pipeline was DN50. Before starting the steam turbine, a breaking test was conducted. The time required for the vacuum to rise from -0.06MPa to 0MPa was 45 minutes, which seriously exceeded the specified time by 20 minutes.

[0003] In the event of an accident, if an emergency shutdown of the steam turbine is required to rapidly reduce its speed to zero, but the vacuum disruption takes too long, it will hinder the rapid decrease in turbine speed, causing an excessively long coasting time. This could damage the turbine's bearings and lead to serious consequences. Furthermore, because the vacuum cannot rapidly reduce the speed to zero, the equalizing chamber must continue supplying air, resulting in a large temperature difference between the upper and lower cylinder walls. This will cause friction between moving and stationary parts during the next startup, increasing turbine vibration. In addition, condensate will be generated in the pipelines during operation. This condensate will flow out from the pipeline ends, polluting the surrounding environment and equipment, and endangering operational safety. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a rapid vacuum breaking pipeline valve to solve the problems existing in the background art.

[0005] This utility model provides the following technical solution: a rapid vacuum breaking pipeline valve, comprising a steam turbine exhaust device and a vertical pipeline. The top of the steam turbine exhaust device has a connecting hole with a diameter of 108mm. A vacuum breaking main pipeline with a diameter of 108mm is installed at the top of the steam turbine exhaust device. One end of the vacuum breaking main pipeline is fixedly connected to the connecting hole, and the other end of the vacuum breaking main pipeline extends vertically upward to an 8-meter platform. The other end of the vacuum breaking main pipeline is fixedly connected to the top of the vertical pipeline via an elbow pipe. A manual valve is installed on the vertical pipeline, and a collection tank is installed on the 8-meter platform. A positioning mechanism is installed between the collection tank and the bottom of the vertical pipeline.

[0006] Preferably, the positioning mechanism includes a toggle cover and connecting components. Four connecting components are arranged in an array around the circumference of the vertical pipe. Each connecting component includes a slider one, a slider two, and a positioning post. A through hole is provided through the vertical pipe. Four through holes are provided corresponding to the connecting components. The positioning post and the through hole form a sliding guide fit along the axis of the positioning post.

[0007] Preferably, the end of the positioning post away from the center of the vertical pipe is fixedly connected to the second slider. The first slider is provided with an inclined surface, and the second slider is provided with an inclined surface. The first inclined surface and the second inclined surface match each other. A compression spring is sleeved on the surface of the positioning post, and the elastic force of the compression spring drives the positioning post to move away from the center of the vertical pipe.

[0008] Preferably, the toggle cover is provided with a fixing rod inside, and four fixing rods are provided with corresponding connecting components. The top end of the fixing rod is fixedly connected to the toggle cover, and the bottom end of the fixing rod is fixedly connected to the top of the slider. A guide rod is fixedly connected to the surface of the vertical pipe, and multiple guide rods are provided. The toggle cover is sleeved on the surface of the guide rod, and an auxiliary spring is sleeved on the surface of the guide rod. The elastic force of the auxiliary spring drives the toggle cover to move vertically downward.

[0009] Preferably, the top of the collection tank is provided with an extension head, the surface of the extension head is provided with positioning grooves, four positioning grooves are evenly arranged, the positioning grooves are matched with positioning columns, and the surface of the collection tank is provided with a liquid level observation window.

[0010] The technical effects and advantages of this utility model are as follows:

[0011] 1. By designing a vacuum breaking main pipeline with a large diameter of 108mm, the time required for the turbine to break the vacuum from -0.06MPa to 0MPa is only 15-20 minutes, which is 25-30 minutes shorter than before the modification. This ensures that the turbine speed can drop rapidly when it is shut down or in case of failure, avoiding problems such as bearing wear and rotor overheating caused by excessive coasting time.

[0012] 2. After the vacuum is reduced to zero, the frictional resistance of the turbine rotor increases and the speed drops rapidly to zero, preventing the bearing oil film from rupturing and causing bearing failure under low-speed conditions. In addition, after the vacuum is rapidly destroyed, the equalizing box can immediately stop the gas supply, eliminating the risk of excessive temperature difference between the upper and lower walls of the cylinder and avoiding abnormal vibration caused by friction between moving and stationary parts during start-up and shutdown.

[0013] 3. By directing the condensate to the collection tank, the accumulation of liquid in the pipeline can be prevented from blocking the airflow, and the condensate can also be prevented from polluting the surrounding environment and equipment. In addition, when the collection tank is full, the staff can check the liquid level through the observation window and quickly disassemble the collection tank through the positioning mechanism, which greatly facilitates the cleaning of condensate. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a top view of the steam turbine exhaust device of this utility model.

[0016] Figure 3 This is a connection diagram of the vertical pipe and collection tank of this utility model.

[0017] Figure 4 This is a cross-sectional view of the positioning mechanism of this utility model.

[0018] Figure 5 This utility model Figure 4 Enlarged view of the structure at point A in the image.

[0019] Figure 6 This is a schematic diagram of the collection tank structure of this utility model.

[0020] The attached diagram is labeled as follows: 1. Steam turbine exhaust device; 2. Connecting hole; 3. Vacuum breaking main pipe; 4. Vertical pipe; 41. Through hole; 5. Elbow pipe; 6. Collection tank; 61. Extension head; 611. Positioning groove; 62. Liquid level observation window; 7. Positioning mechanism; 71. Actuating cover; 72. Connecting assembly; 721. Slider one; 7211. Inclined surface one; 722. Slider two; 7221. Inclined surface two; 723. Positioning column; 724. Compression spring; 73. Guide rod; 74. Auxiliary spring; 75. Fixing rod; 8. Manual valve. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The rapid vacuum breaking pipeline valve involved in this utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] This utility model provides a rapid vacuum breaking pipeline valve, including a steam turbine exhaust device 1 and a vertical pipeline 4. The steam turbine exhaust device 1 has a connecting hole 2 at the top with a diameter of 108mm. A vacuum breaking main pipeline 3 with a diameter of 108mm is installed at the top of the steam turbine exhaust device 1. One end of the vacuum breaking main pipeline 3 is fixedly connected to the connecting hole 2, and the other end of the vacuum breaking main pipeline 3 extends vertically upward to an 8-meter platform. The other end of the vacuum breaking main pipeline 3 is fixedly connected to the top of the vertical pipeline 4 through an elbow pipe 5. A manual valve 8 is installed on the vertical pipeline 4. A collection tank 6 is installed on the 8-meter platform, and a positioning mechanism 7 is installed between the collection tank 6 and the bottom of the vertical pipeline 4.

[0023] Furthermore, the positioning mechanism 7 includes a toggle cover 71 and connecting components 72. Four connecting components 72 are arranged in an array around the circumference of the vertical pipe 4. Each connecting component 72 includes a slider 1 721, a slider 2 722, and a positioning post 723. A through hole 41 is provided through the vertical pipe 4, corresponding to the four connecting components 72. The positioning post 723 and the through hole 41 form a sliding guide fit along the axis of the positioning post 723. The end of the positioning post 723 away from the center of the vertical pipe 4 is fixedly connected to the slider 2 722. A first inclined surface 7211 is provided on the slider 1 721, and a second inclined surface 7221 is provided on the slider 2 722. The first inclined surface 7211 matches the second inclined surface 7221. A compression spring 724 is sleeved on the surface of the positioning post 723. The elastic force of the compression spring 724 drives the positioning post 723 to move away from the center of the vertical pipe 4. A fixing mechanism is provided inside the toggle cover 71. The rod 75 and the fixed rod 75 are respectively connected to the connecting component 72. The top end of the fixed rod 75 is fixedly connected to the toggle cover 71, and the bottom end of the fixed rod 75 is fixedly connected to the top of the slider 721. The vertical pipe 4 is fixedly connected to the guide rod 73. Multiple guide rods 73 are provided. The toggle cover 71 is sleeved on the surface of the guide rod 73. The surface of the guide rod 73 is sleeved with an auxiliary spring 74. The elastic force of the auxiliary spring 74 drives the toggle cover 71 to move vertically downward. The top of the collection tank 6 is provided with an extension head 61. The surface of the extension head 61 is provided with a positioning groove 611. Four positioning grooves 611 are evenly provided. The positioning grooves 611 match the positioning column 723. The surface of the collection tank 6 is provided with a liquid level observation window 62. The liquid level observation window 62 makes it easy for the staff to observe whether the condensate in the collection tank 6 is full. In addition, the collection tank 6 is not a sealed design. The collection tank 6 is provided with a vent hole, which can ensure that the air in the outside environment can pass through the collection tank 6 and enter the vertical pipe 4.

[0024] During the installation of the collection tank 6, the worker pushes the actuating cover 71, causing it to move upward along the guide rod 73. The auxiliary spring 74 contracts under the pressure of the actuating cover 71, and its elasticity increases. At this time, the elasticity of the compression spring 724 is released, driving the second slider 722 to move away from the vertical pipe 4. The positioning post 723 also moves away from the interior of the vertical pipe 4 and retracts into the through hole 41. The worker inserts the extension head 61 at the top of the collection tank 6 into the vertical pipe 4 and releases the actuating cover 71. The elasticity of the auxiliary spring 74 is released, driving the actuating cover 71 and the first slider 721 to move downward as a whole. During this process, the first inclined plane 7211 slides along the second inclined plane 7221. Under the pressure of the first slider 721, the positioning post 723 moves towards the center of the vertical pipe 4 and inserts into the positioning groove 611. The positioning post 723 and the positioning groove 611 cooperate to connect and fix the collection tank 6 to the vertical pipe 4.

[0025] The working principle of this utility model:

[0026] 1. Triggered shutdown: When a turbine malfunction triggers an emergency shutdown, the main steam valve closes and the system stands by.

[0027] 2. Opening the valve: The staff opens the manual valve 8 on the 8-meter platform. The outside air passes through the vertical pipe 4 and the elbow pipe 5 in sequence, and then rushes into the steam turbine exhaust device 1 through the vacuum breaking main pipe 3 with a pipe diameter of 108mm.

[0028] III. Vacuum Breakdown: The air flow rate is increased by 4.6 times compared to the original DN50 pipeline, and the vacuum of the exhaust device rises from -0.06MPa to 0MPa at normal pressure within 15-20 minutes.

[0029] IV. Condensate Treatment: Condensate flows downward along vertical pipe 4 and enters collection tank 6.

[0030] V. Speed ​​Reduction Protection: Vacuuming to zero increases rotor friction resistance, shortens coasting time, prevents bearing overheating, and the equalizing box stops gas synchronously to reduce cylinder temperature difference.

[0031] VI. System Reset: After the system is shut down, the operator shall close the manual valve 8, periodically disassemble the collection tank 6 and clean up the accumulated water to ensure it is usable next time.

[0032] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0033] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0034] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A quick vacuum breaking pipeline valve comprising a steam turbine exhaust (1) and a vertical pipeline (4), characterized in that, The steam turbine exhaust device (1) top is provided with a communication hole (2), the communication hole (2) aperture is 108mm, the steam turbine exhaust device (1) top is provided with a vacuum destruction main pipeline (3), the vacuum destruction main pipeline (3) pipe diameter is 108mm, the vacuum destruction main pipeline (3) one end is fixedly connected with communication hole (2), the vacuum destruction main pipeline (3) the other end vertically extends to 8 meters platform, the vacuum destruction main pipeline (3) the other end and vertical pipeline (4) top end between through elbow pipe (5) fixedly connected, vertical pipeline (4) on installation has manual valve (8), 8 meters platform is provided with collection tank (6), the collection tank (6) and vertical pipeline (4) bottom between being provided with positioning mechanism (7).

2. A quick vacuum breaking pipe valve according to claim 1, characterized in that The positioning mechanism (7) includes a toggle cover (71) and a link assembly (72), the link assembly (72) is provided with four, and four link assemblies (72) are arrayed around the circumferential direction of the vertical pipe (4), the link assembly (72) includes a slider one (721), a slider two (722) and a positioning column (723), the vertical pipe (4) is provided with a through hole (41) penetratingly, the through hole (41) is provided with four corresponding to the link assembly (72), the positioning column (723) and the through hole (41) form a sliding guide fit along the axis direction of the positioning column (723).

3. A quick vacuum breaking pipe valve according to claim 2, characterized in that The positioning column (723) is fixedly connected with the slider two (722) at one end away from the center of the vertical pipe (4), the slider one (721) is provided with an inclined surface one (7211), the slider two (722) is provided with an inclined surface two (7221), the inclined surface one (7211) and the inclined surface two (7221) are matched, the positioning column (723) is provided with a compression spring (724), and the elastic force of the compression spring (724) drives the positioning column (723) to move away from the center of the vertical pipe (4).

4. A quick vacuum breaking pipe valve according to claim 3, characterized in that The inside of the toggle cover (71) is provided with a fixed rod (75), the fixed rod (75) is provided with four corresponding to the link assembly (72), the top end of the fixed rod (75) is fixedly connected with the toggle cover (71), the bottom end of the fixed rod (75) is fixedly connected with the top of the slider one (721), the vertical pipe (4) is fixedly connected with a guide rod (73), the guide rod (73) is provided with a plurality of, the toggle cover (71) is sleeved on the surface of the guide rod (73), the surface of the guide rod (73) is sleeved with an auxiliary spring (74), and the elastic force of the auxiliary spring (74) drives the toggle cover (71) to move vertically downward.

5. A quick vacuum breaking pipe valve according to claim 4, characterized in that The top of the collection tank (6) is provided with an extension head (61), the surface of the extension head (61) is provided with a positioning groove (611), the positioning groove (611) is uniformly provided with four, the positioning groove (611) is matched with the positioning column (723), and the surface of the collection tank (6) is provided with a liquid level observation window (62).

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