A thin sheet metal stack welded dynamic seal for turbomachinery

Abstract

The utility model relates to a sealing structure especially a thin metal sheet stack welding type dynamic sealing device for turbomachinery. A thin metal sheet stack welding type dynamic sealing device for turbomachinery, including the shell, the inner ring of shell is provided with multiple installation grooves, is used for clamping into the inner core in the installation groove, and the inner core is used for installing the copper core body, and the outer circle side wall of copper core body is in close contact with the installation groove. The thin metal sheet stack welding type dynamic sealing device for turbomachinery is provided with the shell, and the multiple installation grooves of the inner circle layer configuration provide accurate assembly space for the inner core, and the inner core is specially used for carrying the copper core body, realizes effective sealing barrier under the dynamic sealing scene through the close contact of the outer circle side wall of copper core body and the installation groove, and guarantees the medium sealing effect when the device operates.

Description

Technical Field

[0001] This utility model relates to sealing structures, and more particularly to a dynamic sealing device for turbine machinery using a thin metal sheet stacked and welded type. Background Technology

[0002] As core equipment in the energy and power sectors, the performance of dynamic sealing devices in turbomachinery directly determines the equipment's operating efficiency and stability. These devices must prevent media leakage in complex environments with high-speed rotation and fluctuating operating conditions, while simultaneously balancing sealing effectiveness, service life, and cost-effectiveness, placing stringent demands on overall technical performance.

[0003] Currently, mainstream sealing technologies have significant shortcomings: labyrinth seals have large leakage rates and are not very adaptable to rotor vibration, making it difficult to meet the requirements for high-precision sealing; brush seals have smaller leakage rates, but the brush filaments are prone to permanent wear, frictional heating, and collapse, resulting in limited lifespan and high manufacturing costs; gas film seals have excellent sealing performance, but their complex structure, stringent requirements for operating conditions and control systems, and high costs make them difficult to widely adopt.

[0004] Existing technologies cannot simultaneously achieve a balance between sealing performance, service life, and cost-effectiveness, and therefore cannot fully meet the diverse operational needs of turbine machinery. Therefore, developing a dynamic sealing device with a reasonable structure, reliable sealing, low wear, and controllable cost has become a pressing technical challenge for the industry.

[0005] In view of the above-mentioned shortcomings, the designer actively researched and innovated in order to create a dynamic sealing device for turbine machinery that uses thin metal sheet stacking and welding, making it more industrially valuable. Utility Model Content

[0006] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a dynamic sealing device for turbine machinery that uses a thin metal sheet stacked and welded type.

[0007] This utility model discloses a thin metal sheet stacked and welded dynamic sealing device for turbine machinery, including a housing, an inner ring of which is provided with multiple mounting grooves, an inner core is inserted into the mounting grooves, a copper core is installed in the inner core, and the outer ring sidewall of the copper core fits against the mounting grooves.

[0008] This thin metal sheet stacked and welded dynamic sealing device for turbine machinery has an outer shell, and multiple mounting grooves in its internal ring provide precise assembly space for the inner core. The inner core is specifically designed to support the copper core body. Through the tight fit between the outer ring sidewall of the copper core body and the mounting groove, effective sealing and isolation are achieved in dynamic sealing scenarios, ensuring the media sealing effect during device operation.

[0009] Furthermore, the outer shell is divided into an upper shell and a lower shell. The lower shell has through bolt holes on both sides of its lower end, and the lower shell has locking screw holes that mate with the bolt holes. The surface of the lower shell has upward-protruding positioning pins, and the bottom of the upper shell has positioning holes that mate with the positioning pins.

[0010] The outer shell adopts a split design of upper and lower shells. The through bolt holes on both sides of the lower end of the upper shell can be precisely matched with the corresponding locking screw holes on the lower shell. The upper and lower shells are stably assembled by bolt connection. At the same time, the positioning pins protruding upward on the surface of the lower shell are matched with the positioning holes at the bottom of the upper shell, which can quickly complete the positioning and alignment of the upper and lower shells, ensuring assembly accuracy and the stability of the overall structure.

[0011] Furthermore, the outer wall of the inner core has a recessed positioning groove, and a positioning block is fixed in the positioning groove by bolts. The surface of the positioning block has an outwardly protruding positioning head, which contacts the limiting step set in the mounting groove. The upper and lower surfaces of the positioning head are provided with arc-shaped grooves, and the surface of the limiting step is provided with protrusions that cooperate with the arc-shaped grooves.

[0012] The outer wall of the inner core is provided with a recessed positioning groove. The positioning block is fixed in the positioning groove by bolts. The positioning head with its outward protrusion contacts the limiting step in the mounting groove. The arc-shaped grooves on the upper and lower surfaces of the positioning head and the corresponding protrusions on the surface of the limiting step form a precise fit, which can not only limit the circumferential and axial displacement of the inner core, but also improve the positioning accuracy and structural stability after assembly.

[0013] Furthermore, an annular positioning ring is provided on the inner side of the inner core, and sealing ring strips protrude outward on both sides of the positioning ring. The copper core body has a locking groove that mates with the positioning ring, and there are inner sealing grooves on both sides of the locking groove that mate with the sealing ring strips.

[0014] The inner core has an annular positioning ring on the inside. The sealing rings protruding outward on both sides of the positioning ring form a precise assembly with the positioning groove on the copper core. The inner sealing grooves on both sides of the positioning groove correspond to and fit with the sealing rings, which not only achieves stable positioning of the copper core and the inner core, but also enhances the sealing performance after the two are connected through multiple fitting structures, thus preventing media leakage.

[0015] Furthermore, the copper core has concave outer sealing grooves on both sides, which fit against the inner wall of the mounting groove.

[0016] The copper core has concave outer sealing grooves on both sides. These outer sealing grooves fit tightly against the inner wall of the mounting groove. By increasing the contact area, the sealing barrier effect is enhanced, effectively preventing the medium from leaking along the gaps in the inner wall of the mounting groove, and further improving the overall dynamic sealing reliability of the device.

[0017] Furthermore, the copper core consists of two sets of identical semi-circular structures, with the joint of the copper cores being an inclined cross-section.

[0018] The copper core is made up of two sets of identical semi-circular structures spliced ​​together. The splice is designed with an inclined cross section, which facilitates quick alignment and assembly in the installation scenario, and also improves the sealing performance and structural integrity after splicing through the inclined contact surface, avoiding media leakage caused by splice gaps.

[0019] Furthermore, multiple sets of tightening screw holes are provided on the surfaces of the upper and lower shells. The number of tightening screw holes in each set is consistent with the number of mounting slots. A tightening screw is screwed into each tightening screw hole. The end of the tightening screw can contact the corresponding inner core. A limiting nut is screwed into the tail end of the tightening screw. The inner side of the limiting nut contacts the outer surface of the upper or lower shell.

[0020] Multiple sets of tightening screw holes are opened on the surface of both the upper and lower shells. The number of tightening screw holes in each set corresponds one-to-one with the mounting slot. After the tightening screw is screwed into the tightening screw hole, its end can abut against the corresponding inner core. Then, by screwing the limit nut into the tail end of the tightening screw and locking it against the outer surface of the upper or lower shell, a stable tightening force can be formed on the inner core on the inside, effectively preventing the inner core from shifting or loosening during the operation of the device and ensuring the stability of the sealing structure.

[0021] Furthermore, the copper core is formed by stacking copper sheets radially along the circumference.

[0022] The copper core is formed by stacking copper sheets radially along the circumference. The stacked structure not only gives the copper core good elasticity and adaptability, allowing it to better fit the mating parts in dynamic sealing scenarios, but also reduces friction loss and extends the service life of the sealing device by taking advantage of the material properties of the copper sheets.

[0023] By means of the above solution, this utility model has at least the following advantages: 1. Excellent sealing performance and significantly reduced leakage: The copper core is formed by stacking thin copper sheets radially along the circumference, creating a large number of tiny tortuous leakage paths, generating a "multiple throttling effect". Combined with the tight fit between the outer sealing groove and the installation groove, the multiple adaptations between the sealing ring and the inner sealing groove, and the structural design of the inclined splicing section, a comprehensive sealing system is constructed. The sealing effect far exceeds that of traditional labyrinth seals, effectively preventing media leakage.

[0024] 2. High flexibility and adaptability, and high operational stability: The thin copper sheet itself has good elasticity, and the stacked structure of the copper core gives it excellent flexibility. At the same time, the device can adapt to the dynamic eccentricity and vibration of the rotor through the arc-shaped cooperation of the positioning head and the limiting step, and the radial floating space design of the inner core, avoiding component damage caused by hard friction, and solving the problem of poor adaptability of traditional seals to rotor vibration.

[0025] 3. Excellent wear resistance and extended service life: The copper core is made of copper with high thermal conductivity and high plasticity, forming a good friction pair with the steel shaft, resulting in low wear rate; the excellent thermal conductivity of copper can quickly dissipate frictional heat, avoiding material failure caused by local overheating, and the plastic deformation of copper after slight friction can better fit the shaft surface, further optimizing the sealing effect and significantly extending the service life compared to brush seals.

[0026] 4. Simple and reliable structure with obvious cost advantages: The device is composed of modular components such as outer shell, inner core, and copper core. The core process is copper sheet stamping, stacking and vacuum brazing. Compared with the complex structure of gas film seal and the high manufacturing cost of brush seal, the material cost and manufacturing cost are significantly reduced. At the same time, the design of the split outer shell and semi-circular spliced ​​copper core facilitates assembly and maintenance. The modular sealing core can be replaced individually, which greatly reduces maintenance costs.

[0027] 5. Precise and convenient assembly, strong practicality: The outer shell is quickly positioned by positioning pins and positioning holes, and is firmly connected by bolts. The inner core is precisely limited by positioning blocks and limiting steps. The combination of tightening screws and limiting nuts can effectively prevent the inner core from shifting and loosening during operation. The overall structural design takes into account both assembly accuracy and ease of operation, and can adapt to the diverse operating needs of turbine machinery, and has a wide range of industrial application value.

[0028] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show a certain embodiment of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the upper shell structure of this utility model; Figure 3 This is a utility model Figure 1 A schematic diagram of the structure after removing the top shell; Figure 4 This is a utility model Figure 3 Another perspective illustration; Figure 5 This is an assembly diagram of the inner core and copper core of this utility model; Figure 6 This is a partially enlarged schematic diagram of the inner core cross-section of this utility model; Figure 7 This is a partially enlarged schematic diagram of the cross-sectional view of the copper core of this utility model; Figure 8 This is a utility model Figure 4 A magnified view of a portion of the image; Figure 9 This is a utility model Figure 4 Another perspective and a magnified view of the area; In the diagram: 1. Outer shell; 2. Mounting groove; 3. Inner core; 4. Copper core; 5. Upper shell; 6. Lower shell; 7. Bolt mounting hole; 8. Locking screw hole; 9. Positioning pin; 10. Positioning groove; 11. Positioning block; 12. Positioning head; 13. Limiting step; 14. Positioning ring; 15. Sealing ring strip; 16. Inner sealing groove; 17. Outer sealing groove; 18. Tightening screw; 19. Limiting nut; 20. Locking groove. Detailed Implementation

[0031] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0032] See Figures 1-3 This type of thin metal sheet stacked and welded dynamic sealing device for turbine machinery first uses a vacuum brazing process to solidify the outer ring of the copper core 4 and the inner core 3 into a whole, ensuring structural integrity and connection stability. Then, the inner core 3, after being assembled with the copper core 4, is inserted into the mounting groove 2 of the inner ring of the outer shell 1, so that the side wall of the outer ring of the copper core 4 and the mounting groove 2 are tightly fitted to form an initial seal. During subsequent operation of the device, the solidified copper core 4 and the inner core 3 are synchronously adapted to the rotor operating conditions. The stable connection brought by vacuum brazing avoids relative displacement, and the fit between the copper core 4 and the mounting groove 2 prevents media leakage. This process simplifies the assembly operation, ensures the assembly accuracy of each component, strengthens the connection strength between the copper core 4 and the inner core 3 through the vacuum brazing process, and improves the overall sealing reliability of the device by utilizing the fit seal between the copper core 4 and the mounting groove 2, effectively extending the service life.

[0033] See Figure 1 , Figure 2 as well as Figure 8First, align the positioning hole at the bottom of the upper shell 5 with the upward-protruding positioning pin 9 on the surface of the lower shell 6 for precise alignment, quickly completing the initial assembly and positioning of the upper and lower shells. Then, insert bolts through the through bolt holes 7 on both sides of the lower end of the upper shell 5, and tighten the bolts with the corresponding locking screw holes 8 on the lower shell 6 to achieve a stable connection between the upper shell 5 and the lower shell 6. The cooperation between the positioning pin 9 and the positioning hole can greatly improve assembly efficiency and avoid assembly deviation. The bolt connection between the bolt holes 7 and the locking screw holes 8 can ensure the overall structural integrity of the outer shell 1 and prevent relative displacement between the upper shell 5 and the lower shell 6 during operation. This provides reliable support for the stable operation of internal components such as the inner core 3 and the copper core 4. At the same time, the split upper and lower shell design also facilitates subsequent maintenance and component replacement.

[0034] See Figure 8 First, the positioning block 11 is fixed in the recessed positioning groove 10 on the outer wall of the inner core 3 with bolts to ensure that the positioning block 11 is installed firmly. Then, the inner core 3 with the positioning block 11 installed is inserted into the mounting groove 2 of the outer shell 1, so that the positioning head 12 protruding outward on the surface of the positioning block 11 contacts the limiting step 13 in the mounting groove 2, and the arc-shaped grooves on the upper and lower surfaces of the positioning head 12 precisely fit with the corresponding protrusions on the surface of the limiting step 13. The advantage of this workflow is that the positioning groove 10 provides a stable installation base for the positioning block 11. The arc-shaped fit between the positioning head 12 and the limiting step 13 can quickly achieve precise positioning of the inner core 3 in the mounting groove 2, and effectively limit the circumferential and axial displacement of the inner core 3, preventing the inner core 3 from loosening or shifting during device operation. At the same time, the arc-shaped fit structure can also buffer the vibration and impact during operation, improve the structural stability of the inner core 3 after assembly, and provide a reliable guarantee for the sealing work of the copper core 4.

[0035] See Figure 6 and Figure 7 The assembly process of the inner core 3 and the copper core 4 is as follows: First, the positioning groove 20 on the copper core 4 is aligned with the annular positioning ring 14 on the inner side of the inner core 3 and fitted together, so that the positioning ring 14 is fully embedded in the positioning groove 20. At the same time, the sealing rings 15 protruding outward on both sides of the positioning ring 14 are precisely engaged in the inner sealing grooves 16 on both sides of the positioning groove 20 to achieve a tight fit. Then, the mating surfaces of the inner core 3 and the copper core 4 are welded together to ensure that the inner core 3 and the inner side of the copper core 4 are firmly connected. The welding process of the precise fit between the inner core 3 and the copper core 4 not only quickly completes the positioning and assembly of the two, but also strengthens the integrity and stability of the connection structure through the inner side welding. It effectively prevents the relative displacement of the inner core 3 and the copper core 4 during the operation of the device. At the same time, the welding seal and the fit structure form a double protection, further preventing the medium from leaking along the inner connection gap, significantly improving the sealing reliability and service life of the device.

[0036] See Figure 7 and Figure 8When the assembled inner core 3 and copper core 4 assembly is inserted into the mounting groove 2 of the outer shell 1, the concave outer sealing grooves 17 on both sides of the copper core 4 are precisely aligned and tightly fitted with the inner wall of the mounting groove 2. With the help of the pre-tightening force during assembly, the outer sealing grooves 17 and the inner wall of the mounting groove 2 form a complete fit. The concave structure of the outer sealing grooves 17 not only increases the contact area with the inner wall of the mounting groove 2, but also forms a sealed cavity after fitting, effectively preventing the medium from leaking along the gap between the inner wall of the mounting groove 2 and the copper core 4. At the same time, the fitting structure can improve the sealing reliability without additional sealing components, simplify the assembly process, and the tight fit can provide stable support for the copper core 4, reduce vibration and displacement during operation, and further ensure the stability and durability of the overall dynamic sealing effect of the device.

[0037] See Figure 5 First, two sets of identical semi-circular copper cores 4 are precisely aligned and fitted together using their inclined splicing sections to ensure a seamless connection at the joint. Then, the splicing sections are fixed. Subsequently, the assembled copper core 4 is assembled with the inner core 3. The combination of the two sets of semi-circular structures and the inclined splicing sections not only makes the assembly of the copper core 4 more convenient and enables quick and accurate alignment, avoiding assembly deviations, but also increases the splicing contact area through the inclined fitting surface, improving the overall structural integrity and stability of the copper core 4. This effectively prevents the splicing from loosening or the medium from leaking from the splicing gaps during operation. At the same time, the detachable semi-circular design also facilitates the individual inspection and replacement of the copper core 4 in the future, reducing maintenance costs.

[0038] See Figure 8 and Figure 9 After the upper shell 5 and lower shell 6 are assembled and the inner core 3 is inserted into the mounting groove 2, multiple sets of tightening screw holes are made on the surfaces of the upper shell 5 and lower shell 6, with the number of holes in each set matching the number of holes in the mounting groove 2. The tightening screws 18 are screwed into the corresponding tightening screw holes one by one, so that the end of the tightening screw 18 makes precise contact with the corresponding inner core 3 and applies a moderate tightening force. Then, the limiting nut 19 is screwed into the tail end of the tightening screw 18, so that the inner side of the limiting nut 19 fits tightly against the outer surface of the upper shell 5 or lower shell 6 and locks it in place, thus completing the tightening of the inner core 3. The design of the number of fixing and tightening screw holes corresponding to the number of mounting slots 2 enables precise tightening of each inner core 3. The cooperation between the tightening screw 18 and the limit nut 19 provides a stable and adjustable tightening force, effectively preventing the inner core 3 from shifting or loosening during device operation, ensuring the sealed fit between the inner core 3 and the copper core body 4. At the same time, the threaded connection method facilitates the adjustment of the tightening force according to the actual working conditions in the later stage, and also provides convenience for disassembling the inner core 3 during maintenance, further improving the operational stability and maintenance flexibility of the device.

[0039] The preparation and assembly process of the copper core 4 of this device is as follows: First, suitable copper sheets are selected and neatly stacked layer by layer along the circumferential radial direction to form a copper core 4 blank with a preset structure. During the stacking process, it is ensured that each layer of copper sheets is tightly attached. Then, the stacked copper core 4 is solidified. After that, the formed copper core 4 is assembled with the inner core 3. The method of stacking copper sheets along the circumferential radial direction can give the copper core 4 good elasticity and structural stability. The micro-bent flow channels formed by multi-layer stacking can generate multiple throttling effects, significantly reducing medium leakage. At the same time, the stacking structure of copper sheets allows the copper core 4 to better adapt to the dynamic working conditions of the rotor, reducing frictional losses during operation. Combined with the excellent thermal conductivity and wear resistance of copper material itself, the service life of the copper core 4 is further extended. Moreover, the stacking process is simple and controllable, which can reduce the manufacturing cost of the copper core 4 and improve production efficiency.

[0040] 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. 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. Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A dynamic sealing device for turbine machinery, characterized by: (The device is made of thin metal sheet stacked and welded together.) The outer shell (1) has multiple mounting grooves (2) on its inner ring. The mounting grooves (2) are used to insert the inner core (3). The inner core (3) is used to install the copper core (4). The outer ring sidewall of the copper core (4) fits against the mounting grooves (2).

2. The thin metal sheet stacked and welded dynamic sealing device for turbine machinery according to claim 1, characterized in that: The outer shell (1) is divided into an upper shell (5) and a lower shell (6). The upper shell (5) has through bolt holes (7) on both sides of the lower end. The lower shell (6) has locking screw holes (8) that match the bolt holes (7). The surface of the lower shell (6) has upward protruding positioning pins (9). The bottom of the upper shell (5) has positioning holes that match the positioning pins (9).

3. A thin metal sheet stacked and welded dynamic sealing device for turbine machinery according to claim 2, characterized in that: The inner core (3) has a recessed positioning groove (10) on its outer wall. A positioning block (11) is fixed in the positioning groove (10) by bolts. The surface of the positioning block (11) has a positioning head (12) that protrudes outward. The positioning head (12) contacts the limiting step (13) set in the mounting groove (2). The upper and lower surfaces of the positioning head (12) are provided with arc-shaped grooves. The surface of the limiting step (13) is provided with protrusions that cooperate with the arc-shaped grooves.

4. A thin metal sheet stacked and welded dynamic sealing device for turbine machinery according to claim 2 or 3, characterized in that: The inner core (3) has an annular positioning ring (14) on its inner side, and sealing ring strips (15) protruding outward on both sides of the positioning ring (14). The copper core (4) has a locking groove (20) that cooperates with the positioning ring (14), and there are inner sealing grooves (16) on both sides of the locking groove (20) that cooperate with the sealing ring strips (15).

5. A thin metal sheet stacked and welded dynamic sealing device for turbine machinery according to claim 4, characterized in that: The copper core (4) has concave outer sealing grooves (17) on both sides, and the outer sealing grooves (17) are attached to the inner wall of the mounting groove (2).

6. A thin metal sheet stacked and welded dynamic sealing device for turbine machinery according to claim 4, characterized in that: The copper core (4) consists of two sets of identical semi-circular structures, and the copper core (4) is spliced ​​at an inclined cross section.

7. A thin metal sheet stacked and welded dynamic sealing device for turbine machinery according to claim 4, characterized in that: Multiple sets of tightening screw holes are provided on the surfaces of the upper shell (5) and the lower shell (6). The number of tightening screw holes in each set is the same as that in the mounting groove (2). A tightening screw (18) is screwed into each tightening screw hole. The end of the tightening screw (18) can contact the corresponding inner core (3). The tail end of the tightening screw (18) is screwed into the limiting nut (19). The inner side of the limiting nut (19) contacts the outer surface of the upper shell (5) or the lower shell (6).

8. A thin metal sheet stacked and welded dynamic sealing device for turbine machinery according to claim 1, characterized in that: The copper core (4) is formed by stacking copper sheets radially along the circumference.

Images