An interstage gas seal scraping tool for a centrifugal large scale machine

Abstract

The utility model discloses a kind of interstage gas seal scraping tools for centrifugal large unit, including bottom plate, tool clamping tool and scraper. Two first threaded holes are provided on bottom plate;Tool clamping tool includes angle adjusting plate and tool slot, round hole and arc waist groove are provided on angle adjusting plate, the position of round hole and arc waist groove corresponds with the two first threaded holes on bottom plate, so that fastener can pass through round hole and arc waist groove and angle adjusting plate is fixed on bottom plate. Tool slot is set to the side of angle adjusting plate away from bottom plate. Scraper includes handle and the tool bit connected to one end of handle, handle is detachably installed in tool slot. Among them, the extension shape of arc waist groove is configured to allow angle adjusting plate to rotate around the center of round hole within a preset angle range. The scraping tool provided by the utility model can improve the scraping efficiency and precision, reduce maintenance time and cost.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal large-scale unit installation technology, and in particular to an interstage air seal scraping tool for centrifugal large-scale units. Background Technology

[0002] Whether the interstage gas seal clearance of a large compressor unit meets the standard is an important guarantee for the normal operation of the compressor, which is reflected in improving compressor efficiency, ensuring stable operation of the compressor, and extending the service life of the compressor.

[0003] During the installation of existing large-scale generating units, manual scraping and adjustment using tools at the maintenance site are required to ensure the interstage air seal clearance. However, manual scraping suffers from low efficiency, low precision, and susceptibility to damage, leading to high maintenance costs and impacting normal unit operation. Especially after prolonged use, severe wear of the scrapers necessitates frequent replacements, increasing labor costs and time, thus adding to the maintenance workload. During manual air seal scraping, operators may come into contact with rotating rotors or other moving parts, potentially resulting in mechanical injuries such as crushing, cutting, or impact. Improper tool use or poor tool maintenance can damage tools, causing injury to operators. Repetitive and monotonous work can lead to operator distraction or fatigue, increasing the probability of accidents. Due to the high degree of uncertainty in manual operation, various unforeseen situations may occur, such as improper tool use or operational errors, all of which can lead to serious safety accidents.

[0004] Therefore, it is necessary to propose a gas seal scraping tool for large centrifugal units. Utility Model Content

[0005] This utility model provides an interstage air seal scraping tool for large centrifugal units to solve the problems of low scraping efficiency, low precision, and easy damage of manual scrapers in the prior art.

[0006] To solve the above-mentioned technical problems and achieve the purpose of this utility model, this utility model provides an interstage gas seal scraping tool for large centrifugal units, comprising:

[0007] The base plate has two first threaded holes.

[0008] A tool clamping fixture includes an angle adjusting plate and a tool slot. The angle adjusting plate is provided with a round hole and an arc-shaped groove. The positions of the round hole and the arc-shaped groove correspond to the two first threaded holes on the base plate, so that fasteners can pass through the round hole and the arc-shaped groove to fix the angle adjusting plate to the base plate. The tool slot is located on the side of the angle adjusting plate away from the base plate.

[0009] A scraper, the scraper including a handle and a blade head connected to one end of the handle, the handle being detachably mounted in the blade slot;

[0010] The extended shape of the arc-shaped waist groove is configured to allow the angle adjustment plate to rotate around the center of the circular hole within a preset angle range.

[0011] Optionally, the tool clamping fixture further includes a feed adjustment mechanism, which includes a second threaded hole and a feed set screw that cooperates with it;

[0012] The second threaded hole is located at the end of the tool slot away from the tool head, and the axial extension direction of the second threaded hole is consistent with the axial extension direction of the scraper.

[0013] The scraping depth can be adjusted by rotating the feed set screw to move the scraper shank along the tool slot.

[0014] Optionally, the tool clamping fixture further includes a clamping mechanism, which includes a third threaded hole disposed on the side wall of the tool slot and a clamping set screw that cooperates therewith, for laterally locking and fixing the scraper housed in the tool slot.

[0015] Optionally, the central angle corresponding to the arc-shaped waist groove is 30 degrees.

[0016] Optionally, the scraper's blade head includes a V-shaped blade head.

[0017] Optionally, the scraper's blade head includes a flat-head blade head.

[0018] Optionally, the blade tip of the scraper may be made of high-speed steel or cemented carbide.

[0019] Optionally, the fastener includes an M6 single-headed bolt.

[0020] Optionally, the feed screw includes an M6 single-headed feed screw.

[0021] Optionally, the clamping set screw includes an M6 single-ended set screw.

[0022] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:

[0023] 1. Improved efficiency and precision: Compared with manual scraping, mechanical operation is faster and more uniform, and can ensure scraping depth and flatness through precise adjustment, ultimately improving the air seal performance.

[0024] 2. Reduced occupational and safety risks: The machine significantly reduces physical exertion and repetitive labor for operators, lowering the risk of fatigue and occupational diseases. Simultaneously, it reduces direct contact between personnel and hazardous parts, fundamentally enhancing safety performance.

[0025] 3. Cost savings: Reduces material costs and replacement time costs caused by frequent tool breakage; reduces waste of air seal material by precisely controlling the scraping amount.

[0026] 4. Enhanced adaptability and reliability: With adjustable angles, replaceable blades, and customizable base plates, this tool is flexible and applicable to various models of centrifugal compressors, steam turbines, etc., offering high reliability and versatility. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the base plate provided in one embodiment of the present utility model;

[0028] Figure 2 This is a side view of the tool clamping fixture in this embodiment.

[0029] Figure 3 This is a top view of the tool clamping fixture in this embodiment.

[0030] Figure 4 This is a schematic diagram of the scraper structure including the V-shaped blade head in this embodiment;

[0031] Figure 5 This is a schematic diagram of the scraper structure including a flat-head blade in this embodiment.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100 - Base plate; 110 - First threaded hole;

[0034] 200-Tool clamping fixture;

[0035] 210 - Angle adjustment plate; 211 - Round hole; 212 - Arc-shaped groove;

[0036] 220 - Tool slot; 221 - Third threaded hole;

[0037] 230 - Feed adjustment mechanism; 231 - Third threaded hole.

[0038] 300 - scraper; 310 - handle; 320 - blade head. Detailed Implementation

[0039] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed explanation of the interstage gas seal scraping tool for large centrifugal units proposed in this utility model. The advantages and features of this utility model will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, intended only to facilitate and clearly illustrate the embodiments of this utility model. Please refer to the drawings to make the objectives, features, and advantages of this utility model more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by this utility model, should still fall within the scope of the technical content disclosed in this utility model.

[0040] Please see Figures 1-4 , Figure 1 This is a schematic diagram of the structure of the base plate provided in one embodiment of the present utility model. Figure 2 This is a side view of the tool clamping fixture in this embodiment. Figure 3 This is a top view of the tool clamping fixture in this embodiment. Figure 4 This is a schematic diagram of the scraper structure including the V-shaped blade head in Embodiment 1. Figure 5 This is a schematic diagram of the scraper structure including a flat-head blade in this embodiment. (Combined with...) Figures 1-5 The interstage gas seal scraping tool for centrifugal large units provided in this embodiment includes a base plate 100, a tool clamping fixture 200, and a scraper 300.

[0041] The base plate 100 serves as the mounting base for the entire tool. It has a rectangular plate structure with two first threaded holes 110 machined on its surface. The length and width of the base plate 100 can be customized according to the model of the unit to be maintained and the specific dimensions of the cylinder cover to ensure good installation stability and compatibility.

[0042] The tool clamping fixture 200 is mounted on the base plate 100 by fasteners (not shown). The tool clamping fixture 200 includes an integrally formed angle adjustment plate 210 and a tool slot 220. The angle adjustment plate 210 has a circular hole 211 and an arc-shaped groove 212. The arrangement of the circular hole 211 and the arc-shaped groove 212 precisely corresponds to the two first threaded holes 110 on the base plate 100. In this embodiment, the central angle corresponding to the arc-shaped groove 212 is 30 degrees. In other embodiments, the central angle corresponding to the arc-shaped groove 212 can also be set to other angles so that the angle adjustment plate 210 can obtain other angle adjustment ranges. This embodiment does not make specific limitations.

[0043] Two M6 single-ended bolts are used as fasteners, passing through the circular hole 211 and the arc-shaped groove 212 respectively, and screwed into the first threaded hole 110 of the base plate 100. When the bolts are loosened, the angle adjustment plate 210 can rotate and adjust within a range of ±15 degrees around the center of the circular hole 211 to adapt to the irregular shape of the cover in the cylinder, so that the base plate 100 can maintain the maximum contact area and enhance operational stability. After adjusting to the required angle, tightening the bolts will securely lock the angle adjustment plate 210 onto the base plate 100.

[0044] The tool slot 220 is located on the side of the angle adjustment plate 210 away from the base plate 100 and is used to accommodate the scraper 300. The scraper 300 consists of a handle 310 and a cutting head 320. The cutting head 320 is a V-shaped cutting head or a flat-head cutting head used in this embodiment. When a V-shaped cutting head is used, its V-shaped opening design can effectively hold the thin-walled gas seal (usually about 0.3 mm thick) during scraping operations, preventing it from bending and shifting, thereby ensuring scraping accuracy and reducing subsequent correction work. The cutting head 320 is made of high-speed steel or cemented carbide, which has high hardness, high wear resistance and good red hardness, making it suitable for low-speed cutting conditions and significantly improving scraping efficiency and tool life. In other embodiments, other materials can also be used to make the scraper 300, and this embodiment does not make specific limitations.

[0045] Before actual use, the thickness of the working part of the cutter head 320 can be manually ground and finely adjusted according to the spacing and outer diameter of the air seal teeth of the specific unit in order to optimize the cutting effect.

[0046] The tool holder 310 is detachably inserted into the tool slot 220. In order to achieve secure fastening and precise feeding of the scraper 300, the tool clamping fixture 200 also integrates a clamping mechanism and a feed adjustment mechanism 230.

[0047] The clamping mechanism includes a third threaded hole 221 located on the side wall of the tool slot 220 and a clamping set screw (not shown) that mates with it. In this embodiment, an M6 single-ended set screw is used as the clamping set screw. After the scraper 300 is placed in the appropriate position, tightening the clamping set screw will securely lock the handle 310 of the scraper 300 in the tool slot 220 from the side, preventing it from moving during the scraping process.

[0048] The feed adjustment mechanism 230 includes a second threaded hole 231 located at the end of the tool slot 220 (i.e., the end away from the cutter head 320) and a feed set screw (not shown) that mates with it. In this embodiment, an M6 single-ended set screw is used as the feed set screw. The axial extension direction of the second threaded hole 231 is consistent with the extension direction of the tool slot 220, i.e., the axial direction of the scraper 300. After loosening the clamping set screw, by rotating the feed set screw, its front end can push the handle 310 of the scraper 300, causing the entire scraper 300 to move slightly forward (towards the cutter head 320) along the tool slot 220, thereby achieving precise and controllable adjustment of the scraping depth. After adjustment, the clamping set screw can be tightened again.

[0049] The interstage gas seal scraping tool for large centrifugal units provided in this embodiment has the following beneficial effects:

[0050] 1. In the past, the main tools for scraping gas seals were saw blades or high-speed steel. The scraping tool provided in this embodiment uses high-speed steel or cemented carbide as the cutting tool material. This material has high heat resistance and is suitable for low-speed cutting, which increases scraping efficiency. It can quickly and evenly scrape off the material on the surface of the gas seal, significantly improving work efficiency compared to manual operation.

[0051] 2. The scraping tool provided in this embodiment allows for adjustment of the scraping depth and angle of the scraper 300, adapting to the maintenance needs of different unit models. The scraping tool provided in this embodiment can precisely adjust and control the feed amount through the feed adjustment mechanism 230, ensuring the scraping depth and surface smoothness, thereby improving the sealing performance of the gas seal. Furthermore, precise control of the scraping amount can reduce material waste and improve material utilization.

[0052] 3. The scraping tool in this embodiment can reduce the physical labor of operators, reduce the risk of fatigue and occupational diseases caused by long-term repetitive actions, reduce the direct contact between operators and dangerous parts, thereby reducing the risk of accidental injury.

[0053] 4. The scraping tool in this embodiment adopts a replaceable scraper 300 design, which can adapt to air seals of different materials and shapes. Different scraping needs can be met by changing different blades or adjusting the angle and feed rate.

[0054] In summary, the interstage gas seal scraping tool for large centrifugal units provided in this embodiment has high safety, flexible adjustment device, strong adaptability, improves scraping efficiency and accuracy, reduces maintenance time and cost, and is suitable for various models of centrifugal compressors, steam turbines, etc.

[0055] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0056] In the description of this utility model, it should be understood that the terms "center," "height," "thickness," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0057] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0058] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0059] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A scraping tool for interstage gas seals in large centrifugal units, characterized in that, include: The base plate has two first threaded holes. A tool clamping fixture includes an angle adjusting plate and a tool slot. The angle adjusting plate is provided with a round hole and an arc-shaped groove. The positions of the round hole and the arc-shaped groove correspond to the two first threaded holes on the base plate, so that fasteners can pass through the round hole and the arc-shaped groove to fix the angle adjusting plate to the base plate. The tool slot is located on the side of the angle adjusting plate away from the base plate. A scraper, the scraper including a handle and a blade head connected to one end of the handle, the handle being detachably mounted in the blade slot; The extended shape of the arc-shaped waist groove is configured to allow the angle adjustment plate to rotate around the center of the circular hole within a preset angle range.

2. The interstage gas seal scraping tool as described in claim 1, characterized in that, The tool clamping fixture also includes a feed adjustment mechanism, which includes a second threaded hole and a feed set screw that cooperates with it; The second threaded hole is located at the end of the tool slot away from the tool head, and the axial extension direction of the second threaded hole is consistent with the axial extension direction of the scraper. The scraping depth can be adjusted by rotating the feed set screw to move the scraper shank along the tool slot.

3. The interstage gas seal scraping tool as described in claim 1, characterized in that, The tool clamping fixture also includes a clamping mechanism, which includes a third threaded hole disposed on the side wall of the tool slot and a clamping set screw that cooperates therewith, for laterally locking and fixing the scraper housed in the tool slot.

4. The interstage gas seal scraping tool as described in claim 1, characterized in that, The central angle corresponding to the arc-shaped waist groove is 30 degrees.

5. The interstage gas seal scraping tool as described in claim 1, characterized in that, The scraper's blade head includes a V-shaped blade head.

6. The interstage gas seal scraping tool as described in claim 1, characterized in that, The scraper head includes a flat-headed blade.

7. The interstage gas seal scraping tool as described in claim 1, characterized in that, The blade head of the scraper is made of high-speed steel or cemented carbide.

8. The interstage gas seal scraping tool as described in claim 1, characterized in that, The fasteners include M6 single-headed bolts.

9. The interstage gas seal scraping tool as described in claim 2, characterized in that, The feed set screw includes an M6 single-head set screw.

10. The interstage gas seal scraping tool as described in claim 3, characterized in that, The clamping set screw includes an M6 single-head set screw.

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