Dismounting system and method for connecting nut of high-pressure cylinder of steam turbine

Abstract

The invention relates to the field of steam turbines, in particular to a steam turbine high-pressure cylinder connecting nut dismounting system and method.The system comprises a cleaning device, a heating device and a cooling device; a connector of a compressed gas mechanism in the cleaning device is connected with one end of a first ventilation pipeline, a connector of a negative pressure mechanism is connected with a second ventilation pipeline, the other end of the first ventilation pipeline is connected with a first observation hole in the outer wall of a connecting nut, and the other end of the second ventilation pipeline is connected with a second observation hole in the outer wall of the connecting nut. The heating device sleeves the outer wall of the connecting nut and is used for heating the connecting nut; the cooling device comprises a cooling gas mechanism and a cooling channel, the cooling gas mechanism sprays cooling gas to the inner wall of a threaded ring at the steam inlet end of the high-pressure cylinder through the cooling channel, and the connecting nut can be efficiently disassembled.

Description

Technical Field

[0001] This application relates to the field of steam turbines, and particularly to a disassembly system and method for the connecting nut of the high-pressure cylinder of a steam turbine. Background Art

[0002] A steam turbine is a rotary power device that converts the thermal energy of steam into mechanical energy, and is widely used in power plants, ship propulsion, industrial drives and other fields. Its core principle is to use high-temperature and high-pressure steam to push the blades to rotate, thereby driving a generator or other mechanical equipment.

[0003] At present, two sets of high-pressure steam inlet valve groups are provided in domestic large steam turbine generator sets. The high-pressure steam inlet valve group includes a main steam valve and a main governing valve connected in a one-to-one form. The main steam valve and the main governing valve share a valve housing and are connected to both sides of the unit. The main steam enters the main steam valve and the main governing valve through the main steam inlet. Inside the main governing valve, it is connected to the high-pressure cylinder through a steam inlet pipe. The main steam directly enters the inside of the high-pressure cylinder through the steam inlet pipe. The main governing valve is connected to the high-pressure cylinder through a connecting nut. This connecting nut is large in volume and heavy in weight, and plays a role in connecting and positioning the high-pressure cylinder and the high-pressure steam inlet valve group.

[0004] When overhauling the high-pressure cylinder of a steam turbine generator set, it is necessary to remove the connecting nut to separate the high-pressure cylinder from the high-pressure steam inlet valve group. Since the overhaul period of the high-pressure cylinder of a steam turbine generator set is more than several years, and this connecting nut has been in a high-temperature and high-pressure operating environment for a long time, its disassembly and installation are difficult. It is not only the key process restricting the overhaul period of the steam turbine generator set, but also once the disassembly and assembly are not favorable and this connecting nut gets stuck and cannot be unscrewed, then only cutting and blasting can be used for removal, resulting in losses of spare parts, labor, and power generation losses caused by the increase in the overhaul period of the steam turbine generator set reaching more than ten million yuan. Summary of the Invention

[0005] In view of the above problems, this application provides a disassembly system and method for the connecting nut of the high-pressure cylinder of a steam turbine, which can achieve the efficient removal of the connecting nut.

[0006] To achieve the purpose of this application, the following technical solutions are provided in this application:

[0007] In the first aspect, this application provides a disassembly system for the connecting nut of the high-pressure cylinder of a steam turbine. The disassembly system includes: a cleaning device, a heating device, and a cooling device;

[0008] The cleaning device includes a compressed gas mechanism, a negative pressure mechanism, a first ventilation pipe, and a second ventilation pipe. The interface of the compressed gas mechanism is connected to one end of the first ventilation pipe, and the interface of the negative pressure mechanism is connected to the second ventilation pipe. The other end of the first ventilation pipe is used to connect to a first observation hole on the outer wall of the connecting nut, and the other end of the second ventilation pipe is used to connect to a second observation hole on the outer wall of the connecting nut. A plurality of the first observation holes and a plurality of the second observation holes are provided on the side wall of the connecting nut, and the first observation holes on the side wall of the connecting nut are opposite to the second observation holes;

[0009] The heating device is sleeved on the outer wall of the connecting nut for heating the connecting nut;

[0010] The cooling device includes a cooling gas mechanism and a cooling channel. The cooling gas mechanism sprays cooling gas onto the inner wall of the thread ring at the steam inlet end of the high-pressure cylinder through the cooling channel.

[0011] In a possible implementation manner, the cleaning device further includes a flow splitting chamber and a flow collecting chamber. The compressed gas mechanism is connected to one end of the flow splitting chamber, and the other end of the flow splitting chamber is connected to one end of a plurality of the first ventilation pipes;

[0012] The negative pressure mechanism is connected to one end of the flow collecting chamber, and the other end of the flow collecting chamber is connected to one end of a plurality of the second ventilation pipes.

[0013] In a possible implementation manner, the cooling channel includes a third ventilation pipe and a jetting mechanism. The jetting mechanism includes a cylindrical pipe and a nozzle. A plurality of groups of nozzles are evenly connected to the outer wall of the cylindrical pipe at preset intervals along the axial direction of the cylindrical pipe. Each group of nozzles includes a plurality of nozzles, and the plurality of nozzles are evenly arranged at preset angles along the circumferential direction of the cylindrical pipe.

[0014] In a possible implementation manner, a positioning rod is provided at one end of the outer wall of the third ventilation pipe close to the cooling gas mechanism, and at least two groups of opposite support frames are connected to the outer wall of the third ventilation pipe along the axial direction of the third ventilation pipe.

[0015] In a possible implementation manner, the cleaning device further includes a fourth ventilation pipe and a fifth ventilation pipe;

[0016] The compressed gas mechanism and the flow splitting chamber are connected through the fourth ventilation pipe, and a pressure gauge and an air isolation valve are provided on the fourth ventilation pipe;

[0017] The negative pressure mechanism and the flow collecting chamber are connected through the fifth ventilation pipe, and an air isolation valve is provided on the fifth ventilation pipe.

[0018] In a possible implementation, the cooling mechanism further includes a sixth ventilation pipeline, with both ends of the sixth ventilation pipeline connected to the cooling gas mechanism and the third ventilation pipeline respectively, and a pressure gauge and a gas isolation valve are arranged on the sixth ventilation pipeline.

[0019] In a possible implementation, it further includes a support device and a spring bracket locking device;

[0020] The support device is used to support the main regulating valve and the main steam valve, and the spring locking device is used to insert into the spring bracket of the high-pressure steam inlet valve group.

[0021] In a possible implementation, the disassembly system further includes a vibration device, the vibration device includes a first frame, a vibration hammer and a traction mechanism, the first frame is movably connected to the vibration hammer through the traction mechanism, and the vibration mechanism is used to vibrate the connecting nut.

[0022] In a second aspect, the present application provides a method for disassembling the connecting nut of a steam turbine high-pressure cylinder, which is implemented through the steam turbine high-pressure cylinder connecting nut disassembly system involved in the first aspect. The method includes:

[0023] Connect the first ventilation pipeline of the cleaning device to the first observation hole of the connecting nut, and connect the second ventilation pipeline of the cleaning device to the second observation hole of the connecting nut;

[0024] Start the compressed gas mechanism and the negative pressure mechanism to clean the sundries in the gap between the connecting nut and the steam inlet pipeline;

[0025] Set the heating device on the outer wall of the connecting nut, and place the cooling channel of the cooling device inside the steam inlet of the high-pressure cylinder;

[0026] Start the heating device to heat the outer wall of the connecting nut, and at the same time start the cooling device to spray cooling gas through the cooling channel on the inner wall of the thread ring at the steam inlet of the high-pressure cylinder to cool the inner wall of the thread ring;

[0027] After removing the heating device and the cooling device, rotate and disassemble the connecting nut to complete the disassembly of the connecting nut.

[0028] In a possible implementation, after removing the heating device and the cooling device, the method further includes:

[0029] Set a support device at the bottom of the main regulating valve and the main steam valve;

[0030] Insert a spring bracket locking device into the spring bracket of the high-pressure steam inlet valve group;

[0031] Use the vibration device to vibrate the connecting nut axially along the connecting nut.

[0032] The beneficial effects of the embodiments of the present application are as follows:

[0033] First, the compressed gas mechanism injects high-pressure gas into the connecting nut through the first ventilation pipe, loosening and blowing away the internal dirt, while the negative pressure mechanism sucks out the loosened dirt through the second ventilation pipe. It can be seen that through the coordinated action of the compressed gas mechanism and the negative pressure mechanism of the cleaning device, impurities such as scale between the connecting nut and the steam inlet pipe can be effectively removed, ensuring the cleanliness of the connection of the connecting nut and creating good conditions for subsequent disassembly.

[0034] Second, the heating device heats the connecting nut by sleeving it on the outer wall of the connecting nut, causing the outer wall of the connecting nut to expand due to heat. At the same time, the cooling gas is transported to the jet mechanism through the third ventilation pipe and evenly sprayed onto the inner wall of the thread ring at the steam inlet end of the high-pressure cylinder, ensuring uniform and efficient cooling effect. The heating device and the cooling device act simultaneously, increasing the temperature difference between the inside and outside of the connecting nut and ensuring that the connecting nut can be loosened. Therefore, the disassembly system for the connecting nut of the steam turbine high-pressure cylinder provided by the embodiments of the present application realizes the efficient and safe disassembly of the connecting nut through the coordinated action of the cleaning device, the heating device, and the cooling device. Description of the Drawings

[0035] The drawings are used to provide a further understanding of the present application and constitute a part of the specification. They are used together with the embodiments of the present application to explain the present application and do not constitute a limitation to the present application.

[0036] Figure 1 It is a schematic structural diagram of the steam turbine provided by the embodiments of the present application;

[0037] Figure 2 It is a schematic structural diagram of the cleaning device provided by the embodiments of the present application;

[0038] Figure 3 It is a schematic structural diagram of a cooling device provided by the embodiments of the present application;

[0039] Figure 4 It is a flowchart of a method for disassembling the connecting nut of the steam turbine high-pressure cylinder provided by the embodiments of the present application;

[0040] Illustration:

[0041] 1. Connecting nut; 2. Cleaning device; 210. Compressed gas mechanism; 211. First ventilation pipe; 212. Shunt chamber; 213. Fourth ventilation pipe; 220. Negative pressure mechanism; 221. Second ventilation pipe; 222. Confluence chamber; 223. Fifth ventilation pipe; 3. Cooling device; 31. Cooling gas mechanism; 32. Third ventilation pipe; 33. Jet mechanism; 331. Cylindrical pipe; 332. Nozzle; 34. Positioning rod; 35. Support frame; 36. Sixth ventilation pipe; 4. High-pressure cylinder; 5. Main regulating valve; 6. Main steam valve; 7. Spring support. Detailed implementation manners

[0042] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the accompanying drawings in the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts shall fall within the protection scope of the present application.

[0043] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0044] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features; in the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0045] Embodiment 1

[0046] Currently, two sets of high-pressure steam inlet valve groups are provided in large domestic steam turbine generator sets. Figure 1 The figure shows a schematic diagram of the steam turbine structure provided by the embodiment of the present application. As Figure 1The high-pressure steam inlet valve group shown includes a main regulating valve 5 and a main steam valve 6 connected in a one-to-one manner. The two groups of main regulating valves 5 and main steam valves 6 share a valve housing and are connected on both sides of the unit. The main steam enters the main regulating valve 5 and the main steam valve 6 through the main steam inlet. The inside of the main regulating valve 5 is connected to the high-pressure cylinder through the steam inlet cannula, and the main steam directly enters the high-pressure cylinder 4 through the steam inlet cannula.

[0047] The main regulating valve 5 is connected to the high-pressure cylinder 4 through the connecting nut 1. Specifically, the main regulating valve 5 is connected to the first end of the steam inlet plug, the outer wall of the steam inlet end of the high-pressure cylinder is provided with a threaded ring, and the second end of the steam inlet plug is connected to the steam inlet end of the high-pressure cylinder and is threadedly connected through the connecting nut 1. Since the maintenance cycle of the high-pressure cylinder of this type of generator set is more than ten years, and this connecting nut 1 is in a high-temperature and high-pressure operating environment for a long time, it is inevitable that there are a large number of oxide scales, absorbed insulation cotton, dust and other debris between the inner wall of the connecting nut 1 and the outer wall of the steam inlet plug. Therefore, the embodiment of the present application provides a cleaning device 2 for cleaning the debris between the inner wall of the connecting nut 1 and the outer wall of the steam inlet plug.

[0048] Figure 2 The schematic diagram of the structure of the cleaning device 2 provided in the embodiment of the present application is shown as follows: Figure 2 As shown, a cleaning device 2 provided in an embodiment of the present application includes a compressed gas mechanism 210, a negative pressure mechanism 220, a first ventilation pipe 211 and a second ventilation pipe 221, the interface of the compressed gas mechanism 210 is connected to one end of the first ventilation pipe 211, the interface of the negative pressure mechanism 220 is connected to the second ventilation pipe 221, the other end of the first ventilation pipe 211 is connected to the first observation hole on the outer wall of the connecting nut 1, the other end of the second ventilation pipe 221 is connected to the second observation hole on the outer wall of the connecting nut 1, and the side wall of the connecting nut is provided with a plurality of first observation holes and a plurality of second observation holes, and the first observation hole on the side wall of the connecting nut is opposite to the second observation hole.

[0049] When using the cleaning device 2, first connect the first ventilation pipe 211 to the first observation hole, connect the second ventilation pipe 221 to the second observation hole, and then start the compressed air mechanism and the negative pressure mechanism 220 in sequence. The compressed gas mechanism 210 applies high-pressure gas to the surface of the debris through the first ventilation pipe 211 to loosen the debris, and the negative pressure mechanism 220 attracts and discharges the debris through the second ventilation pipe 221. This embodiment can quickly and thoroughly clean the debris between the inner wall of the connecting nut 1 and the outer wall of the steam inlet plug through the synergistic effect of high-pressure gas pressure and negative pressure suction.

[0050] Exemplarily, the compressed gas is compressed air, the compressed gas mechanism 210 includes a compressed air machine or a compressed air storage cylinder, and the negative pressure mechanism 220 is a negative pressure vacuum cleaner or a negative pressure pump.

[0051] One end of the first ventilation pipe 211 and the second ventilation pipe 221 connected to the connecting nut 1 is provided with a joint. The joint is matched with the size of the observation hole, can be sleeved in the observation hole, and a sealing rubber ring is sleeved on the side wall of the joint to ensure the sealed and detachable connection between the ventilation pipe and the observation hole.

[0052] In some embodiments, the cleaning device 2 further includes a flow splitting chamber 212 and a flow collecting chamber 222. The flow splitting chamber 212 and the flow collecting chamber 222 are chambers with a certain space. The compressed gas mechanism 210 is connected to one end of the flow splitting chamber 212, and the other end of the flow splitting chamber 212 is connected to one end of a plurality of first ventilation pipes 211. Among them, the flow splitting chamber 212 can evenly distribute the high-pressure gas from the compressed air mechanism into a plurality of first ventilation pipes 211, ensuring that the gas pressure and flow rate in each pipe are consistent, thereby improving the cleaning efficiency.

[0053] The negative pressure mechanism 220 is connected to one end of the flow collecting chamber 222, and the other end of the flow collecting chamber 222 is connected to one end of a plurality of second ventilation pipes 221. Among them, the flow collecting chamber 222 can collect the sundries and gas from a plurality of second ventilation pipes 221 into one outlet, facilitating the unified treatment by the negative pressure mechanism 220 and improving the cleaning efficiency. At the same time, the flow collecting chamber 222 can buffer the negative pressure fluctuation and ensure the stability of the operation of the negative pressure mechanism 220.

[0054] In some embodiments, the cleaning device 2 further includes a fourth ventilation pipe 213 and a fifth ventilation pipe 223;

[0055] The compressed gas mechanism 210 and the flow splitting chamber 212 are connected through the fourth ventilation pipe 213, and a pressure gauge and an air isolation valve are arranged on the fourth ventilation pipe 213. The negative pressure mechanism 220 and the flow collecting chamber 222 are connected through the fifth ventilation pipe 223, and an air isolation valve is arranged on the fifth ventilation pipe 223. The gas pressure in the first ventilation pipe 211 is collected and displayed by the pressure gauge, and the gas flow rate is controlled by the air isolation valve.

[0056] In this embodiment, the working principle of the cleaning device 2 is as follows: First, connect the first ventilation pipe 211 to the first observation hole and the second ventilation pipe 221 to the second observation hole. First, start the compressed gas mechanism 210, then slowly open the air isolation valve on the fourth ventilation pipe 213 until the pressure gauge shows a pressure of about 0.2 mpa, and then turn on the negative pressure mechanism 220 to clean the sundries between the inner wall of the connecting nut 1 and the outer wall of the steam inlet insertion pipe. After the cleaning is completed, turn off the negative pressure mechanism 220 and the compressed air mechanism in sequence.

[0057] Embodiment 2

[0058] An embodiment of the present application provides a heating device. The heating device is sleeved on the outer wall of the connecting nut 1 and is used to heat the connecting nut 1. Exemplarily, the heating device includes an electric heating tape, a heating rod, a heating film, or uses propane gas for flame heating.

[0059] Embodiment 3

[0060] Figure 3 Fig. shows a schematic structural diagram of a cooling device 3 provided by an embodiment of the present application. As Figure 3 shown, the cooling device 3 includes a connected cooling gas mechanism 31 and a cooling channel. The cooling gas mechanism 31 sprays cooling gas onto the inner wall of the thread ring at the steam inlet end of the high-pressure cylinder through the cooling channel.

[0061] Among them, the cooling channel includes a third ventilation pipe 32 and a jet mechanism 33. The cooling gas mechanism 31 is connected to one end of the third ventilation pipe 32, and the other end of the third ventilation pipe 32 is connected to the jet mechanism 33. The jet mechanism 33 is placed inside the steam inlet end of the high-pressure cylinder and faces the inner wall of the thread ring at the steam inlet end of the high-pressure cylinder. Exemplarily, the cooling gas is liquid carbon dioxide.

[0062] In order to comprehensively cool down the inner wall of the thread ring at the steam inlet end of the high-pressure cylinder and avoid consequences such as metal brittle deformation caused by excessive local cooling, an embodiment of the present application provides a jet mechanism 33 that can comprehensively and evenly cool down the inner wall of the thread ring at the steam inlet end of the high-pressure cylinder. The jet mechanism 33 includes a cylindrical tube 331 and nozzles 332. A plurality of groups of nozzles 332 are evenly connected to the outer wall of the cylindrical tube 331 at preset intervals along the axial direction of the cylindrical tube 331. Each group includes a plurality of nozzles 332, and the plurality of nozzles 332 are evenly arranged at preset angles along the circumferential direction of the cylindrical tube 331. Among them, one end of the cylindrical tube 331 opposite to the third ventilation pipe 32 is sealed, and the cooling gas is ejected through the nozzles 332 evenly arranged on the side wall of the cylindrical tube 331.

[0063] Exemplarily, the overall length of the cylindrical tube 331 is 500 mm. Four groups of nozzles 332 are evenly arranged along the axial direction of the cylindrical tube 331 at intervals of 125 mm. Each group includes 8 nozzles 332. These 8 nozzles 332 are evenly arranged at intervals of 45° along the circumferential direction. The length of the nozzles 332 is 50 mm, ensuring that the gas ejected by the cooling device 3 evenly covers the inner wall of the thread ring at the steam inlet end of the high-pressure cylinder in the circumferential direction.

[0064] In a possible implementation manner, the cooling gas mechanism 31 includes a cooling gas storage cylinder or a cooling gas generation device. A positioning rod 34 is provided on the outer wall of the third ventilation pipe 32, and at least two groups of opposite support frames are provided on the outer wall of the third ventilation pipe 32 along the axial direction of the third ventilation pipe 32.

[0065] Exemplarily, each group includes two support frames, which are respectively in the 225° and 315° directions. Additionally, rollers can be connected to the ends of the support frames to facilitate the displacement of the cooling device 3.

[0066] It should be noted that the vertical distance from the end of the support frame to the central axis of the third ventilation pipe 32 is equal to the inner radius of the steam inlet insertion pipe. The vertical distance from the end of the nozzle 332 on the cylindrical pipe 331 to the central axis of the cylindrical pipe 331 needs to be less than the radius of the steam inlet insertion pipe. The setting of the support frame can support the third ventilation pipe 32 and the jet mechanism 33, so that the central axes of the third ventilation pipe 32 and the jet mechanism 33 coincide with the central axis of the steam inlet end of the high-pressure cylinder, thereby ensuring that the gas ejected by the jet mechanism 33 evenly covers the inner wall of the thread ring at the steam inlet end of the high-pressure cylinder in the circumferential direction.

[0067] The distance between the positioning rod 34 and the center of the cylindrical pipe 331 is the same as the distance between the interface end of the main control valve and the center of the inner wall of the thread ring at the steam inlet end of the high-pressure cylinder, which can achieve: inserting the third ventilation pipe 32 and the jet mechanism 33 into the high-pressure cylinder through the interface end of the main control valve. When the positioning rod 34 contacts the interface end of the main control valve, it means that the jet mechanism 33 is placed in place, that is, the jet mechanism 33 is located in the inner wall of the thread ring at the steam inlet end of the high-pressure cylinder.

[0068] Through the embodiment of the present application, when the cooling device 3 enters from the interface end of the main control valve, when the positioning rod 34 contacts the interface end of the main control valve, it means that the jet mechanism 33 is placed in place, that is, the jet mechanism 33 is opposite to the inner wall of the thread ring at the steam inlet end of the high-pressure cylinder, and the third ventilation pipe 32 is provided with a support frame, which can ensure that the central axis of the jet device coincides with the central axis of the steam inlet end of the high-pressure cylinder, realizing the overall cooling of the inner wall of the thread ring at the steam inlet end of the high-pressure cylinder by the jet device and avoiding local cooling.

[0069] Embodiment 4

[0070] The embodiment of the present application provides a disassembly system for the connection nut 1 of a steam turbine high-pressure cylinder, which includes a cleaning device 2, a heating device, a cooling device 3 and a vibration device.

[0071] Through the above embodiments, pre-treatment such as cleaning, heating and cooling is carried out at the connection nut 1. After the pre-treatment is completed, the cleaning device 2, the heating device and the cooling device 3 are removed. Then, a special taper pin is inserted into the observation hole on the side wall of the connection nut 1, and the special taper pin is connected with the steel wire rope of the overhead crane. Finally, the vibration device is used to vibrate the connection nut 1.

[0072] The vibration device includes a first frame, a vibration hammer and a traction mechanism. The first frame is movably connected to the vibration hammer through the traction mechanism, and the vibration mechanism is used to vibrate the connection nut 1.

[0073] In this embodiment, the hammer is pulled up by the traction device to start the vibration impact. The hammer needs to be pulled up by the traction device at an angle of more than 60° to ensure the impact force. At the same time, since the vibration impact will cause the rotational movement of the connecting nut 1, the connection position between the traction device and the main frame is set as an adjustable suspension point, so as to adjust the position of the traction device in the main frame, and further move the vibration impact position of the hammer on the connecting nut 1 along the axial position of the connecting nut 1, realizing the overall vibration impact on the connecting nut 1.

[0074] Embodiment 5

[0075] To prevent the high-pressure steam inlet valve group from skewing and shifting after the connecting nut 1 is completely screwed out, it is necessary to install a temporary fixed support device at the bottom of the main regulating valve 5 and the main steam valve 6 before removing the connecting nut 1, which plays a role of support, positioning and protection.

[0076] The embodiment of the present application provides a disassembly system for the connecting nut of a steam turbine high-pressure cylinder, which includes a cleaning device 2, a heating device, a cooling device 3, a vibration impact device and a support device.

[0077] Among them, the support device is respectively used to support the main regulating valve 5 and the main steam valve 6. The support device includes a second frame and a wedge-shaped pad. Second frames are respectively arranged below the main regulating valve 5 and the main steam valve 6, and two wedge-shaped pads are inserted between the main regulating valve 5 or the main steam valve 6 and the second frame to realize the firm support of the main regulating valve 5 and the main steam valve 6.

[0078] A spring support 7 is arranged in the high-pressure steam inlet valve group (i.e., the main regulating valve 5 and the main steam valve 6). Since the design load of the spring support 7 is the overall weight of the high-pressure steam inlet valve group, the high-pressure cylinder and its attached pipelines, when only the weight of the high-pressure steam inlet valve group remains after the connecting nut 1 is screwed out, it will cause the spring stress to be released, resulting in the high-pressure steam inlet valve group being lifted or even overturned. Therefore, the embodiment of the present application also provides a spring support locking device. Specifically, before the connecting nut 1 is screwed out, the spring support locking device is inserted into the spring support 7 to ensure that the spring stress is maintained, and even after the connecting nut 1 is screwed out, it can ensure that the positions of the spring support 7 and the high-pressure steam inlet valve group remain unchanged.

[0079] In addition, after the overhaul of the high-pressure cylinder 4 is completed and the connecting nut 1 is installed, it is necessary to remove the spring support locking device to restore the load of the spring support 7. Exemplarily, the spring support locking device is one or more rectangular positioning blocks.

[0080] Embodiment 6

[0081] Figure 4 The flow chart showing the disassembly method of the connecting nut 1 of the steam turbine high-pressure cylinder provided by the embodiment of the present application is as follows Figure 4As shown in the figure, the embodiment of the present application also provides a method for disassembling the connecting nut of the high-pressure cylinder of a steam turbine, which is implemented by the connecting nut 1 disassembly system provided in the above embodiment. The connecting nut 1 disassembly method includes the following steps:

[0082] S100 Connect the first ventilation pipe 211 of the cleaning device 2 to the first observation hole of the connecting nut 1, and connect the second ventilation pipe 221 of the cleaning device 2 to the second observation hole of the connecting nut 1.

[0083] Among them, a plurality of first observation holes and a plurality of second observation holes are provided on the side wall of the connecting nut 1, and the first observation holes and the second observation holes on the side wall of the connecting nut 1 are opposite to each other. The observation holes penetrate the side wall of the connecting nut 1. A tight connection is required between the ventilation pipe and the observation hole of the connecting nut 1.

[0084] S200 Start the compressed gas mechanism 210 and the negative pressure mechanism 220 to clean the sundries in the gap between the connecting nut 1 and the steam inlet pipe.

[0085] Among them, the compressed gas mechanism 210 applies high-pressure gas to the surface of the sundries through the first ventilation pipe 211 to loosen the sundries, and the negative pressure mechanism 220 attracts and discharges the sundries through the second ventilation pipe 221. Through the synergistic effect of high-pressure gas pressure and negative pressure suction, the sundries between the inner wall of the connecting nut 1 and the outer wall of the steam inlet pipe can be quickly and thoroughly cleaned.

[0086] S300 Sleeve the heating device on the outer wall of the connecting nut 1, and place the jet mechanism 33 of the cooling device 3 in the high-pressure cylinder.

[0087] The cooling device 3 enters from the main control valve interface end. When the positioning rod 34 contacts the main control valve interface end, it means that the jet mechanism 33 is placed in place, that is, the jet mechanism 33 is located in the inner wall of the thread ring at the steam inlet end of the high-pressure cylinder. And the third ventilation pipe 32 is provided with a support frame, which can ensure that the central axis of the jet device coincides with the central axis of the steam inlet end of the high-pressure cylinder, realizing the overall cooling of the inner wall of the thread ring at the steam inlet end of the high-pressure cylinder by the jet device and avoiding local cooling.

[0088] S400 Start the heating device to heat the outer wall of the connecting nut 1, and at the same time start the cooling device 3 to spray cooling gas on the inner wall of the thread ring at the steam inlet end of the high-pressure cylinder through the cooling channel to cool the inner wall of the thread ring.

[0089] The heating device and the cooling device 3 act simultaneously, increasing the temperature difference between the inside and outside of the connecting nut 1 to ensure that the connecting nut 1 can be loosened.

[0090] S500 After removing the heating device and the cooling device 3, rotate and disassemble the connecting nut 1.

[0091] After removing the cleaning device 2, the heating device, and the cooling device 3, the vibration device, the support device, and the spring support locking device can also be used to assist the rotation and disassembly of the connecting nut 1. Specifically, it includes:

[0092] A support device is arranged below the main regulating valve 5 and the main steam valve 6, a spring support locking device is inserted into the spring support of the high-pressure steam inlet valve group, and the vibration device is used to vibrate the connecting nut 1 along the axial direction of the connecting nut 1.

[0093] It should be noted that when vibrating the connecting nut 1, the position of the traction device in the first frame needs to be adjusted, so that the vibration position of the vibration hammer on the connecting nut 1 moves along the axial position of the connecting nut 1, realizing the overall vibration of the connecting nut 1.

[0094] In the embodiment of the present application, rotating and disassembling the connecting nut 1 specifically includes: inserting a special taper pin into the observation hole on the side wall of the connecting nut 1, connecting the special taper pin with the steel wire rope of the crane, and finally pulling the special taper pin under the traction of the crane to screw out the connecting nut 1, completing the disassembly of the connecting nut 1.

[0095] The beneficial effects of adopting the embodiment of the present application are as follows:

[0096] First of all, the compressed gas mechanism injects high-pressure gas into the connecting nut through the first ventilation pipe, loosening and blowing away the internal dirt, while the negative pressure mechanism sucks out the loosened dirt through the second ventilation pipe. It can be seen that through the synergistic effect of the compressed gas mechanism and the negative pressure mechanism of the cleaning device, the scale and other impurities between the connecting nut and the steam inlet pipe can be effectively removed, ensuring the cleanliness of the connection of the connecting nut and creating good conditions for subsequent disassembly;

[0097] Secondly, the heating device is sleeved on the outer wall of the connecting nut for heating, so that the outer wall of the connecting nut expands due to heat. At the same time, the cooling gas is transported to the jet mechanism through the third ventilation pipe and evenly sprayed onto the inner wall of the thread ring at the steam inlet end of the high-pressure cylinder to ensure uniform and efficient cooling effect. The heating device and the cooling device act simultaneously, increasing the temperature difference between the inside and outside of the connecting nut to ensure that the connecting nut can be loosened. Therefore, the disassembly system for the connecting nut of the high-pressure cylinder of the steam turbine provided by the embodiment of the present application realizes the efficient and safe disassembly of the connecting nut through the synergistic effect of the cleaning device, the heating device, and the cooling device.

[0098] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting it. The present application is not limited to the exact structure already described and illustrated in the drawings, and it cannot be considered that the specific implementation of the present application is only limited to these descriptions. For those of ordinary skill in the technical field to which the present application belongs, without departing from the concept of the present application, various changes and deformations made should be regarded as belonging to the protection scope of the present application.

[0099] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagram may represent a module, a segment of a program, or a portion of code that contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions noted in the blocks may occur in a different order than noted in the accompanying drawings. For example, two consecutive blocks shown may actually be executed substantially in parallel, or they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram or flowchart, and combinations of blocks in the block diagram or flowchart, can be implemented by a dedicated hardware-based system that performs the specified functions or operations, or by a combination of dedicated hardware and computer instructions.

[0100] It should be noted that although several modules or units of devices for action execution are mentioned in the above detailed description, such a division is not mandatory. In fact, according to the embodiments of the present invention, the features and functions of the two or more modules or units described above may be embodied in one module or unit. Conversely, the features and functions of one module or unit described above may be further divided and embodied by a plurality of modules or units.

[0101] From the description of the above embodiments, those skilled in the art can easily understand that the example embodiments described herein can be implemented by software, or by a combination of software and necessary hardware. Therefore, the technical solutions according to the embodiments of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, and includes several instructions to enable a computing device (such as a personal computer, a server, a touch terminal, or a network device, etc.) to execute the method according to the embodiments of the present invention.

[0102] In several embodiments provided in the present application, it should be understood that the disclosed systems, modules, and methods can be implemented in other ways. For example, the module embodiments described above are merely illustrative. For example, the division of units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the couplings or direct couplings or communication connections shown or discussed with each other may be indirect couplings or communication connections through some interfaces, modules, or units, and may be in electrical, mechanical, or other forms.

[0103] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. The present application is not limited to the exact structures that have been described above and illustrated in the drawings, and it cannot be determined that the specific implementation of the present application is only limited to these descriptions. For those of ordinary skill in the technical field to which the present application pertains, without departing from the concept of the present application, various changes and deformations made should be regarded as falling within the protection scope of the present application.

Claims

1. A disassembly system for the connecting nuts of a steam turbine high-pressure cylinder, characterized in that The disassembly system includes: a cleaning device, a heating device, and a cooling device; The cleaning device includes a compressed gas mechanism, a negative pressure mechanism, a first ventilation pipe, and a second ventilation pipe. The interface of the compressed gas mechanism is connected to one end of the first ventilation pipe, and the interface of the negative pressure mechanism is connected to the second ventilation pipe. The other end of the first ventilation pipe is used to connect to a first observation hole on the outer wall of the connecting nut, and the other end of the second ventilation pipe is used to connect to a second observation hole on the outer wall of the connecting nut. A plurality of the first observation holes and a plurality of the second observation holes are provided on the side wall of the connecting nut, and the first observation holes and the second observation holes on the side wall of the connecting nut are opposite to each other; The heating device is sleeved on the outer wall of the connecting nut and is used to heat the connecting nut; The cooling device includes: a cooling gas mechanism and a cooling channel. The cooling gas mechanism sprays cooling gas onto the inner wall of the thread ring at the steam inlet end of the high-pressure cylinder through the cooling channel.

2. The steam turbine high-pressure cylinder connection nut disassembly system according to claim 1, wherein, The cleaning device further includes a shunt chamber and a manifold chamber. The compressed gas mechanism is connected to one end of the shunt chamber, and the other end of the shunt chamber is connected to one end of a plurality of the first ventilation pipes; The negative pressure mechanism is connected to one end of the manifold chamber, and the other end of the manifold chamber is connected to one end of a plurality of the second ventilation pipes.

3. The steam turbine high-pressure cylinder connection nut disassembly system according to claim 1, characterized in that, The cooling channel includes a third ventilation pipe and a jetting mechanism. The jetting mechanism includes a cylindrical pipe and a nozzle. A plurality of groups of nozzles are evenly connected to the outer wall of the cylindrical pipe at a preset distance along the axial direction of the cylindrical pipe. Each group of nozzles includes a plurality of nozzles, and the plurality of nozzles are evenly arranged at a preset angle along the circumferential direction of the cylindrical pipe.

4. The steam turbine high-pressure cylinder connecting nut disassembly system according to claim 3, characterized in that, A positioning rod is provided on the outer wall of the third ventilation pipe and near one end of the cooling gas mechanism, and at least two groups of opposite support frames are connected to the outer wall of the third ventilation pipe along the axial direction of the third ventilation pipe.

5. The steam turbine high-pressure cylinder connecting nut disassembly system according to claim 2, wherein, The cleaning device further includes a fourth ventilation pipe and a fifth ventilation pipe; The compressed gas mechanism and the shunt chamber are connected through the fourth ventilation pipe, and a pressure gauge and an air isolation valve are provided on the fourth ventilation pipe; The negative pressure mechanism and the manifold chamber are connected through the fifth ventilation pipe, and an air isolation valve is provided on the fifth ventilation pipe.

6. The steam turbine high-pressure cylinder connection nut disassembly system according to claim 3, characterized in that, The cooling mechanism further includes a sixth ventilation pipe. Both ends of the sixth ventilation pipe are respectively connected to the cooling gas mechanism and the third ventilation pipe, and a pressure gauge and an air isolation valve are provided on the sixth ventilation pipe.

7. The steam turbine high-pressure cylinder connecting nut disassembly system according to claim 1, characterized in that, It further includes a support device and a spring bracket locking device; The support device is used to support the main regulating valve and the main steam valve, and the spring locking device is used to insert into the spring bracket of the high-pressure steam inlet valve group.

8. The steam turbine high-pressure cylinder connection nut disassembly system according to claim 1, characterized in that, The disassembly system further includes a vibration device. The vibration device includes a first frame, a vibration hammer, and a traction mechanism. The first frame is movably connected to the vibration hammer through the traction mechanism, and the vibration mechanism is used to vibrate the connecting nut.

9. A method for disassembling the connecting nut of a steam turbine high-pressure cylinder, which is applied to the steam turbine high-pressure cylinder connecting nut disassembly system described in any one of claims 1 to 8, and is characterized in that, The method includes: Connecting the first ventilation pipe of the cleaning device to the first observation hole of the connecting nut, and connecting the second ventilation pipe of the cleaning device to the second observation hole of the connecting nut; Start the compressed gas mechanism and the negative pressure mechanism to clean the debris in the gap between the connecting nut and the steam inlet pipe; Set the heating device on the outer wall of the connecting nut, and place the cooling channel of the cooling device inside the steam inlet end of the high-pressure cylinder; Start the heating device to heat the outer wall of the connecting nut, and at the same time start the cooling device to spray cooling gas through the cooling channel on the inner wall of the thread ring at the steam inlet end of the high-pressure cylinder to cool the inner wall of the thread ring; After removing the heating device and the cooling device, rotate and disassemble the connecting nut to complete the disassembly of the connecting nut.

10. The method for disassembling the connecting nut of the high-pressure cylinder of a steam turbine according to claim 9, characterized in that, After removing the heating device and the cooling device, the method further includes: Set a support device at the bottom of the main regulating valve and the main steam valve; Insert a spring support locking device into the spring support of the high-pressure steam inlet valve group; Use a vibration device to vibrate the connecting nut axially along the connecting nut.

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