Oil-free lubrication labyrinth seal structure of compressor packing
The labyrinth seal structure, composed of staggered annular packing blocks and driving components, solves the problem of air leakage at the joints of the sealing rings, achieves complete sealing around the piston rod, improves sealing efficiency and stability, and is suitable for high-purity gas compression.
Patent Information
- Application Number
- CN202520542954.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-03-26
AI Technical Summary
In existing compressor packing seal structures, when the sealing ring is installed with axial misalignment, the joint of the sealing ring cannot fully cover the periphery of the piston rod, resulting in the formation of a leakage path and reducing sealing efficiency and airtightness.
It adopts an oil-free lubricated labyrinth seal structure, and achieves complete sealing of the piston rod periphery through a clamping assembly composed of staggered annular packing blocks and driving components. The labyrinth seal structure extends the leakage path, and the extension assembly enables precise and distributed application of radial loads.
It improves sealing efficiency, avoids leakage paths, ensures the long-term stability of the sealing surface and applicability to high-purity gas compression applications, reduces the risk of lubricant contamination, extends service life, and reduces production costs.
Smart Images
Figure CN223825199U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a compressor sealing equipment technical field, concretely relates to a compressor packing oil -free lubrication labyrinth seal structure. BACKGROUND
[0002] A compressor is a device that compresses gas from a low pressure state to a high pressure state by changing the volume of the gas to increase its pressure. Compressors are widely used in industrial production, including petrochemical, metallurgy, energy, chemical industry, pharmaceutical, food processing and other fields, and are one of the indispensable equipment in modern industry. According to the working principle, the compressor can be divided into volumetric compressor and dynamic compressor, and the reciprocating compressor is a typical representative of the volumetric compressor, which compresses gas by the reciprocating movement of the piston in the cylinder. The working principle of the reciprocating compressor is to periodically change the gas volume in the cylinder by the reciprocating movement of the piston, thereby completing the processes of gas suction, compression and exhaust.
[0003] In the reciprocating compressor, the piston rod is a key component connecting the piston and the driving mechanism, and its reciprocating movement directly affects the efficiency and stability of gas compression. However, since the piston rod needs to pass through the compressor shell in a high pressure environment, there is a high risk of gas leakage at this position. Therefore, the piston rod must be effectively sealed.
[0004] The packing seal structure is a key device designed for the sealing needs of the piston rod, which forms a reliable sealing interface by the close contact of the packing and the surface of the piston rod, preventing the leakage of high pressure gas in the compressor. Especially when dealing with volatile or high pressure gases such as hydrogen and natural gas, the packing seal structure not only ensures the operating efficiency of the compressor, but also reduces environmental pollution and improves the safety of the equipment.
[0005] In the existing packing seal structure, multiple sealing rings and butterfly springs are usually installed in axial misalignment on the piston rod to improve the air tightness. However, since each sealing ring can only cover a part of the circumference of the piston rod, the lap area between the sealing rings, i.e. the joint of the axial misalignment part, may not be fully covered. These joints are usually located on the surface of the circumference of the piston rod, which is easy to form a gas leakage path, thereby reducing the sealing efficiency and affecting the overall air tightness. SUMMARY
[0006] The utility model aims at providing a compressor packing oil -free lubrication labyrinth seal structure, which aims to solve the problem that in the prior art, due to the overall annular design of the sealing ring, when multiple sealing rings are installed in axial misalignment, the sealing ring joint cannot fully cover the circumference of the piston rod, resulting in the formation of a gas leakage path, thereby reducing the sealing efficiency and air tightness.
[0007] The utility model discloses a following technical scheme to solve the above-mentioned technical problems:
[0008] A compressor packing oil-free lubrication labyrinth seal structure, including fixed in the valve body of sealing cavity inner wall and be used for the gland of the one end of valve body, the valve body is equipped with a plurality of sealing units, the sealing unit all includes annular fixed part, the fixed part coaxially fixed in the valve body, the inboard of fixed part evenly arranged with two or more than two packing block, the packing block is the annular structure of disfigurement, and with piston rod coaxially, a plurality of sealing units are arranged in sequence along the axial direction of piston rod, and the adjacent fixed part is arranged in a certain angle and is dislocated, so that the packing block in each sealing unit can form the encirclement coverage on the circumference of piston rod, and then realize the complete sealing of the circumference of piston rod, the fixed part is equipped with the abutting assembly for the radial load of packing block is added.
[0009] Further technical scheme is, the fixed part is three fixed arc blocks, and the adjacent three fixed arc blocks are fixed through connecting piece, so that the fixed part is annular, each fixed arc block is opened towards the one side of valve body and is used for installing the packing groove of packing block, the packing groove is along the radial direction of piston rod and penetrates the fixed arc block, the one side of fixed arc block away from piston rod is in contact with the inner wall of valve body.
[0010] Further technical scheme is, the fixed arc block is opened and is communicated to the packing groove along the radial direction of piston rod and is opened and is communicated to the packing groove, and the abutting assembly includes the abutting strip of sliding connection in the abutting hole, one end of abutting strip extends into the packing groove, and can be in contact with the packing block, and the other end of abutting strip is slid and penetrates the valve body, the valve body is equipped with driving part, and the driving part is used to drive the abutting strip along the abutting hole and slide, so as to push the packing block and give the radial load of piston rod.
[0011] Further, in each fixed arc block, the number of filler grooves is two, and the two filler grooves are isolated from each other by the fixed arc block; the number of filler blocks is the same as that of the filler grooves; the abutting hole is only communicated with one of the filler grooves; the connecting piece comprises a first arc ring and a second arc ring which are coaxially arranged; the first arc ring is hollow inside, and the second arc ring is slidingly connected in the first arc ring; the first arc ring connects adjacent two fixed arc blocks; one end of the fixed arc block is provided with a first sliding groove communicated with the abutting hole; the other end of the fixed arc block is provided with a second sliding groove for slidingly connecting the second arc ring; in the adjacent two fixed arc blocks, one end of the second arc ring can extend into the first sliding groove of one of the fixed arc blocks, and the other end of the second arc ring is slidingly connected in the second sliding groove of the other fixed arc block through a spring damper; the other filler groove is provided with a pressing piece in contact with the filler block in the filler groove; the outer wall of the fixed arc block is provided with an expansion groove communicated with the abutting hole; the expansion groove is provided with an expansion assembly for pushing the second arc ring to slide towards the second sliding groove.
[0012] Further, the pressing piece comprises an intermediate strip; the side wall of the other filler groove is provided with an intermediate groove communicated with the second sliding groove; the intermediate groove is slidingly connected with the intermediate strip fixed with the second arc ring; the intermediate strip is connected with a pressing plate sliding with the second arc ring.
[0013] Further, the expansion assembly comprises a rotating shaft, a turbine, a swing strip, a worm and a power piece; the rotating shaft is rotatably connected in the expansion groove and is parallel to the piston rod; the rotating shaft is fixed with the turbine, and the end of the turbine is connected with the swing strip; the swing strip is located in the same plane as the second arc ring; the end of the swing strip away from the turbine is kept with a gap from the side wall of the expansion groove; the worm is arranged in the expansion groove in a direction perpendicular to the rotating shaft; one end of the worm is rotatably connected on the side wall of the expansion groove, and the other end extends out of the valve body and is rotatably connected to the outer end of the abutting strip; the power piece is fixed on the end of the abutting strip outside the valve body and is used for driving the worm to rotate; the rotation of the worm drives the turbine to rotate, and in turn drives the free end of the swing strip to push the second arc ring to slide along the first arc ring towards the second sliding groove, and drives the intermediate strip to push the pressing plate to press the filler block, so that the radial load is applied to the piston rod.
[0014] Further, the driving piece is a gas cylinder; the arrangement direction of the gas cylinder is parallel to the abutting strip; the fixed end of the gas cylinder is detachably connected on the valve body; the telescopic end of the gas cylinder is detachably connected on the abutting strip outside the abutting strip through a positioning block.
[0015] Compared with the prior art, the utility model has the advantages that:
[0016] 1. During operation, the staggered arrangement of the packing blocks in this structure allows each packing block to provide a more effective and complete sealing coverage around the piston rod. Compared to the traditional continuous ring design, the staggered arrangement allows the edges of the packing blocks to closely adhere to the piston rod surface, eliminating potential leakage paths and ensuring improved sealing performance, thereby increasing sealing efficiency. When multiple staggered sealing units are used in combination, the packing blocks can form a complete circumferential coverage around the piston rod, effectively sealing any possible leakage paths; simultaneously, the staggered arrangement of the packing blocks in multiple sealing units can achieve complete sealing around the piston rod, effectively preventing leakage paths from forming at the joints. This invention adopts an oil-free lubrication design, avoiding the problem of traditional packing seals relying on lubricating oil, ensuring the long-term stability of the sealing surface, and reducing the risk of lubricating oil contaminating the compressed medium, making it suitable for high-purity gas compression applications, such as hydrogen, electronic industrial gases, and other special working conditions.
[0017] 2. Through the synergistic action of the driving component and the extension assembly, precise and distributed application of radial load to the piston rod by the packing block is achieved. The driving component directly pushes the clamping strip to compress the packing block, while the extension assembly, through its sliding second arc ring, cooperates with the compression component to transmit the driving force to the packing block, ensuring uniform contact with the piston rod. Compared to the single load application method in existing technologies, this layered and interconnected load transfer mechanism not only ensures continuous and stable sealing contact between the packing block and the periphery of the piston rod, but also significantly improves the response speed and adaptability of the packing seal structure. Attached Figure Description
[0018] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the following drawings are provided for illustration:
[0019] Figure 1 This is a diagram showing the working state of the packing sealing structure of this utility model.
[0020] Figure 2 This is a three-dimensional view of the packing sealing structure of this utility model.
[0021] Figure 3 This is a three-dimensional view of the valve body of this utility model.
[0022] Figure 4 This is a three-dimensional view of the cap of this utility model.
[0023] Figure 5 This is a structural diagram showing the sealing unit and gland of this utility model located inside the valve body.
[0024] Figure 6 This is a three-dimensional view of the sealing unit of this utility model.
[0025] Figure 7This is a three-dimensional diagram of a partial structure of the sealing unit of this utility model.
[0026] Figure 8 This is a three-dimensional view showing the connection between the first and second arc coils of this utility model.
[0027] Figure 9 This utility model Figure 2 A magnified view of a portion of point A in the middle.
[0028] Figure 10 This is a three-dimensional view of a partial structure of the clamping component of this utility model.
[0029] Figure 11 This is a three-dimensional diagram of the extended component of this utility model.
[0030] Icons: 1-Sealing cavity, 2-Valve body, 3-Glander, 4-Fixing component, 5-Packing block, 6-Clamping assembly, 7-Maze seal structure, 8-Clamping hole, 9-Strip groove, 10-Fixing strip, 11-Piston rod, 12-Connector, 13-Packing groove, 14-Positioning strip, 15-Clamping strip, 16-Through groove, 17-Drive component, 18-First arc ring, 19-Second arc ring, 20-First sliding groove, 21-Extrusion component, 22-Intermediate strip, 23-Extrusion plate, 24-Turbine, 25-Swing strip, 26-Wheel rod, 27-Power component, 28-Positioning plate, 29-Cylinder, 30-Fixing strip. Detailed Implementation
[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0032] Example:
[0033] like Figures 1-11As shown, this utility model provides an oil-free lubricated labyrinth seal structure for compressor packing, including a valve body 2 fixed to the inner wall of a sealing cavity 1 and a pressure cap 3 for sealing one end of the valve body 2; the valve body 2 is provided with several sealing units, and this embodiment uses two sealing units as an example for illustration; each sealing unit includes an annular fixing member 4; the fixing member 4 is coaxially fixed inside the valve body 2; two or more packing blocks 5 are evenly arranged and fixed on the inner side of the fixing member 4, and in this embodiment, the number of packing blocks 5 on the inner side of each fixing member 4 is two. The packing blocks 5 can be made of graphite filling material, which has excellent high temperature resistance, good self-lubricating properties, and Corrosion resistance; the packing block 5 is a fragmented annular structure and is coaxial with the piston rod 11; the two sealing units are arranged sequentially along the axial direction of the piston rod 11, and the adjacent fixing parts 4 are arranged at a certain angle, so that the packing block 5 in each sealing unit can form a surrounding cover around the piston rod 11, thereby achieving a complete seal around the piston rod 11; the fixing part 4 is provided with a clamping component 6 for applying radial load to the packing block 5. After the packing sealing structure is installed, the radial load is applied to the packing block 5 through the clamping component 6, and the packing block 5 can fit more tightly against the periphery of the piston rod 11.
[0034] like Figure 3 , 4 As shown, one end of the valve body 2 has a piston hole through which the piston rod 11 slides; optionally, the wall of the piston hole can be machined into a labyrinth seal structure 7. The labyrinth seal structure 7 increases the length and complexity of the gas leakage path through a series of annular grooves and labyrinthine channels, thereby effectively reducing the leakage rate and improving the sealing effect; the end of the valve body 2 has uniformly distributed first threaded holes; the valve body 2 can be fixed in a predetermined position in the sealing cavity 1 by bolts passing through the first threaded holes; optionally, the other end of the valve body 2 has a locking hole 8 for engaging with the gland 3; the diameter of the locking hole 8 is... The diameter of the first screw hole is larger than that of the piston hole; in order to facilitate the positioning of the cap 3, the inner wall of the locking hole 8 is provided with evenly distributed strip grooves 9 along the axial direction; the cap 3 is fixed with evenly distributed fixing strips 10 on the periphery of the cap barrel; the cap 3 and the valve body 2 are provided with evenly distributed second screw holes; the diameter of the second screw hole is larger than that of the first screw hole; the cap 3 is fixed by passing the bolt through the second screw hole of the cap plate and extending into the second screw hole of the valve body 2, and the end of the cap barrel located inside the valve body 2 can abut against the fixing member 4; the cap plate is provided with a through hole; the through hole is used to accommodate the bolts that connect the valve body 2 to the inner wall of the packing cavity.
[0035] The principles and beneficial effects of the above technical solution:
[0036] During operation, the staggered arrangement of the packing blocks 5 allows each packing block 5 to provide a more effective and complete sealing coverage around the piston rod 11. Compared to the traditional continuous ring design, the staggered arrangement allows the edges of the packing blocks 5 to closely adhere to the surface of the piston rod 11, eliminating potential leakage paths and ensuring improved sealing performance, thereby increasing sealing efficiency. When multiple staggered sealing units are used in combination, the packing blocks 5 can form a complete circumferential coverage around the piston rod 11, effectively blocking any possible leakage paths; simultaneously, the staggered arrangement of the packing blocks 5 in multiple sealing units can achieve complete sealing around the piston rod 11, effectively preventing leakage paths from forming at the joints. Combined with the labyrinth seal structure 7, the leakage path can be further extended, significantly reducing the gas leakage rate and improving airtightness. This invention adopts an oil-free lubrication design, avoiding the problem of traditional packing seals relying on lubricating oil, ensuring the long-term stability of the sealing surface, and reducing the risk of lubricating oil contaminating the compressed medium, making it suitable for high-purity gas compression applications, such as hydrogen, electronic industrial gases, and other special working conditions.
[0037] Compared to traditional continuous annular packing designs, the staggered arrangement of the packing blocks 5 results in a more efficient packing block arrangement. Traditional sealing structures typically use multiple annular packing blocks, which often have gaps or overlapping areas during installation, leading to unnecessary material waste. This invention, by arranging multiple staggered packing blocks 5 in each sealing unit, effectively reduces the use of unnecessary packing material. While ensuring a good seal, it reduces the overall material usage, thereby lowering production and manufacturing costs.
[0038] The staggered arrangement of the packing blocks 5 creates a more uniform and effective seal around the piston rod 11, avoiding leakage paths that may occur at joints in traditional sealing structures. This optimized arrangement results in a more uniform pressure distribution on the sealing surface, reducing wear and aging caused by localized stress concentration in the sealing device. Therefore, the durability of the sealing structure is improved, and its service life is significantly extended.
[0039] In this embodiment, as Figures 5-8As shown, the fixing component 4 consists of three fixed arc blocks, which are coaxial with the valve body 2. The fixed arc blocks are made of stainless steel, which provides high corrosion resistance, mechanical strength, and high temperature resistance. The three fixed arc blocks are fixed together by connectors 12, making the fixing component 4 ring-shaped. Each fixed arc block has a packing groove 13 on the side facing outward from the valve body 2 for installing the packing block 5. Optionally, the cross-sectional shape of the packing groove 13 is arc-shaped. Optionally, the packing block 5 is fixed in the packing groove 13 with an adhesive, such as epoxy resin. The packing groove 13 penetrates the inner wall of the fixed arc block along the radial direction of the piston rod 11, ensuring that the packing block 5 can contact the periphery of the piston rod 11 when the clamping assembly 6 applies a radial load to the packing block 5, thereby improving the airtightness. The side of the fixed arc block away from the piston rod 11 contacts the inner wall of the valve body 2 to ensure a reliable support position, ensuring the fixation and stability of the sealing unit within the valve body 2, and preventing displacement due to vibration or movement.
[0040] Each fixed arc block is fixedly connected to a positioning strip 14 on its periphery; the positioning strip 14 and the strip groove 9 on the inner wall of the valve body 2 slide in fit, which ensures that the fixed arc block maintains stability when sliding axially in the valve body 2 and prevents it from shifting or rotating due to vibration or other external forces, thereby ensuring the precise alignment of the packing seal structure.
[0041] The principles and beneficial effects of the above technical solution:
[0042] Setting up three fixed arc blocks saves more material compared to machining a complete ring structure as a whole. Furthermore, the smaller size of each fixed arc block reduces processing time and equipment requirements, further lowering manufacturing costs.
[0043] In this embodiment, as Figure 3 , 5 As shown in Figure 9, the fixed arc block has a clamping hole on its periphery that connects to the packing groove 13 in the radial direction of the piston rod 11; the clamping assembly 6 includes a clamping strip 15 that is slidably connected in the clamping hole; one end of the clamping strip 15 extends into the packing groove 13 and can contact the packing block 5; the other end of the clamping strip 15 slides through the valve body 2; specifically, the valve body 2 has a through groove 16 in the radial direction for the clamping strip 15 to slide; the valve body 2 is provided with a driving member 17; the driving member 17 is used to drive the clamping strip 15 to slide along the clamping hole, so as to push the packing block 5 to apply a radial load to the piston rod 11.
[0044] The principles and beneficial effects of the above technical solution:
[0045] The drive component 17 provides external force, which is transmitted to the packing block 5 through the clamping strip 15, thereby compressing the packing block 5. After being subjected to radial force, the packing block 5 can evenly distribute pressure and adhere tightly to the surface of the piston rod 11, forming a highly efficient airtight seal.
[0046] In this embodiment, as Figures 6-8 As shown, there are two packing grooves 13, and the two packing grooves 13 are isolated from each other by the fixed arc blocks; the number of packing blocks 5 is the same as the number of packing grooves 13; the included angle of the extension line of the cross section of each fixed arc block is greater than 60° and less than 120°; this ensures that the packing blocks 5 are evenly distributed. When there are only three fixed arc blocks in each sealing unit, the fixed arc can be arranged around the piston rod 11, so that the packing blocks 5 can fully cover the piston rod 11, effectively avoiding leakage caused by the gap between the packing blocks 5, thereby achieving complete sealing of the piston rod 11; at the same time, the included angle range of each fixed arc block is optimized between 60° and 120°, and the number and size of the packing blocks 5 are reasonably allocated. In this way, while ensuring sealing performance, the redundant material of the packing blocks 5 is reduced, which helps to save material costs.
[0047] Each clamping hole communicates with only one of the filling grooves 13; the connector 12 includes a first arc ring 18 and a second arc ring 19 formed by partial cutting, and the two are arranged coaxially; the first arc ring 18 is hollow inside, and the second arc ring 19 is slidably connected inside the first arc ring 18; two adjacent fixed arc blocks are fixedly connected through the first arc ring 18; one end of the fixed arc block has a first sliding groove 20 communicating with the clamping hole; the cross-sectional shape of the first sliding groove 20 is arc-shaped; the other end of the fixed arc block has a second sliding groove for the second arc ring 19 to slide through; in two adjacent fixed arc blocks, the One end of the second arc ring 19 can extend into the first sliding groove 20 of one of the fixed arc blocks, and the other end of the second arc ring 19 is slidably connected to the second sliding groove of another fixed arc block through a spring damper (not shown in the figure); another filling groove 13 in each fixed arc block is provided with an extrusion member 21 connected to the second arc ring 19, and the extrusion member 21 contacts the filling block 5 in the filling groove 13; the outer side wall of the fixed arc block near the first arc ring 18 has an expansion groove that communicates with the abutment hole; the expansion groove is provided with an expansion component for pushing the second arc ring 19 to slide into the second sliding groove.
[0048] The principles and beneficial effects of the above technical solution:
[0049] When the drive member 17 drives the clamping bar 15 to press the packing block 5 in one of the packing grooves 13 to apply a radial load to the piston rod 11, the extension component pushes one end of the second arc ring 19 in the first sliding groove 20. The second arc ring 19 slides along the first arc ring 18 and drives the connected extrusion member 21 to move, so that the extrusion member 21 presses the packing block 5, thereby applying a radial load to the piston rod 11.
[0050] Through the synergistic action of the drive component 17 and the extension assembly, the packing block 5 achieves precise and distributed application of radial load to the piston rod 11. The drive component 17 directly pushes the clamping strip 15 to compress the packing block 5, while the extension assembly, through the sliding second arc ring 19 and cooperation with the extrusion component 21, transmits the driving force to the packing block 5, ensuring uniform contact with the piston rod 11. Compared to the single load application method in the prior art, this layered and interconnected load transfer mechanism not only ensures a continuous and stable sealing contact between the packing block 5 and the periphery of the piston rod 11, but also significantly improves the response speed and adaptability of the packing seal structure.
[0051] By cooperating with the extension components, the first arc ring 18 and the second arc ring 19 of the drive component 17, the driving force of the drive component 17 can be dispersed, avoiding excessive stress on a single packing block 5 or contact point, and improving the stability and durability of the packing seal structure under high pressure, high temperature or high speed conditions.
[0052] By cooperating with the extension components, the first arc ring 18 and the second arc ring 19 of the drive component 17, the packing seal structure has an automatic compensation function. When the packing block 5 is worn or its size changes slightly due to long-term use, it can still achieve effective sealing through load adjustment without frequent maintenance.
[0053] The aforementioned distributed load application method can reduce local friction between the packing block 5 and the piston rod 11, extend the life of the packing block 5, and reduce the frequency of maintenance and replacement, thereby further optimizing the life cycle cost of the packing seal structure.
[0054] The elastic characteristics of the spring damper enable the second arc ring 19 to quickly return to its initial position after the external driving force is lost, i.e., the extension component stops applying force. This avoids the packing block 5 from continuously applying excessive load, reduces the wear of the packing block 5 and the piston rod 11, and extends the service life of the packing seal structure.
[0055] In this embodiment, as Figure 7 , 8As shown, the extrusion member 21 includes an intermediate strip 22; the side wall of the other filling groove 13 has an intermediate groove that communicates with the second sliding groove; the cross-sectional shape of the intermediate groove is arc-shaped, and the intermediate groove, the other filling groove 13, and the second sliding groove are all coaxial; the intermediate strip 22, which is fixed to the second arc ring 19, is slidably connected in the intermediate groove; an extrusion plate 23 that slides with the second arc ring 19 is connected on the intermediate strip 22; the second extrusion plate 23 is slidably connected to the other filling groove 13.
[0056] The principles and beneficial effects of the above technical solution:
[0057] When the second arc ring 19 slides under the pushing action of the extension component, it drives the intermediate strip 22, which is fixedly connected to it, to slide synchronously within the intermediate groove. Since the cross-sectional shape of the intermediate groove is arc-shaped and coaxial with another packing groove 13, the movement trajectory of the intermediate strip 22 can maintain consistency with the packing groove 13. Simultaneously, the intermediate strip 22, through the connected second extrusion plate 23, transmits radial force to the packing block 5 within the packing groove 13, causing the packing block 5 to tightly contact the surface of the piston rod 11, thereby applying radial load to the piston rod 11 and ensuring its sealing effect.
[0058] The coaxial design of the intermediate groove, the filling groove 13, and the second sliding groove ensures the precise movement trajectory of the intermediate strip 22 and the second extrusion plate 23, and the uniform distribution of the contact force with the filling block 5, thus avoiding a decrease in sealing performance due to eccentricity or offset.
[0059] The sliding connection between the intermediate bar 22 and the compression plate 23 enables precise force transmission and dynamic adjustment. Even if the piston rod 11 undergoes slight deformation due to working conditions, dynamic sealing compensation can be achieved through the flexible transmission mechanism of the intermediate bar 22, ensuring sealing reliability.
[0060] In this embodiment, as Figure 8 , 10As shown in Figure 11, the expansion assembly includes a rotating shaft, a turbine 24, a swing bar 25, a worm gear 26, and a power component 27. Both ends of the rotating shaft are rotatably connected to the expansion groove and are parallel to the piston rod 11. The turbine 24 is fixed on the rotating shaft, and its end is connected to the swing bar 25. The swing bar 25 and the second arc ring 19 are located on the same plane. A gap is maintained between the end of the swing bar 25 facing away from the turbine 24 and the sidewall of the expansion groove, thus preventing direct friction between the swing bar 25 and the expansion groove during movement and reducing wear. The worm gear 26 is arranged in the expansion groove in a direction perpendicular to the rotating shaft. The worm gear 26... One end is rotatably connected to the side wall of the expansion groove, and the other end passes through the expansion groove and extends to the outside of the valve body 2, and is rotatably connected to the outer end of the clamping bar 15; the power component 27 is fixed to the end of the clamping bar 15 located outside the valve body 2 by bolts through the positioning plate 28, and is used to drive the worm gear 26 to rotate; specifically, the power component 27 adopts a servo motor, so that the rotation angle can be precisely controlled; the rotation of the worm gear 26 drives the turbine 24 to rotate, which in turn drives the free end of the swing bar 25 to push the second arc ring 19 to slide along the first arc ring 18 towards the second sliding groove, pushing the middle bar 22 to drive the extrusion plate 23 to extrude the packing block 5, thereby applying a radial load to the piston rod 11.
[0061] The principles and beneficial effects of the above technical solution:
[0062] The worm gear is driven to rotate by the power component 27, and the worm gear meshes with the turbine 24 to achieve stable rotation of the turbine 24. The rotation of the turbine 24 further drives the swing bar 25, which is fixedly connected to it, to rotate. The rotation of the swing bar 25 pushes one end of the second arc ring 19 in the first sliding groove 20 to slide in a predetermined direction. Since the second arc ring 19 is slidably connected to the first arc ring 18, the movement of the second arc ring 19 is transmitted to the extrusion plate 23 through the intermediate bar 22, so that the extrusion plate 23 exerts a squeezing effect on the packing block 5 in the other packing groove 13, thereby applying a uniform radial load to the piston rod 11.
[0063] In this embodiment, as Figure 9 As shown, the driving component 17 is a cylinder 29; the arrangement direction of the cylinder 29 is parallel to the clamping strip 15; the fixed end of the cylinder 29 is detachably connected to the valve body 2; specifically, the fixed end of the cylinder 29 is fixedly connected to a fixing strip 30; the fixing strip 30 and the circumferential side of the valve body 2 are bolted together; the telescopic end of the cylinder 29 is detachably connected to the clamping strip 15 on the outside of the clamping strip 15 via a positioning block; specifically, the positioning block is bolted to the outer wall of the clamping strip 15.
[0064] The principles and beneficial effects of the above technical solution:
[0065] The telescopic end of cylinder 29 is detachably connected to the outside of the clamping strip 15 via a positioning block. When the telescopic end of cylinder 29 retracts, it drives the clamping strip 15 to slide radially, thereby squeezing the packing block 5 close to the clamping strip 15, so that the packing block 5 is in close contact with the piston rod 11, forming a high-efficiency seal.
[0066] The connection of the positioning blocks simplifies the installation and maintenance process, while ensuring that the packing block 5 is subjected to uniform force during the sealing process, thereby effectively improving the sealing performance and system reliability.
[0067] This utility model also provides an installation method for an oil-free lubricated labyrinth seal structure for compressor packing, including the following steps:
[0068] S1. Mount the valve body 2 onto the piston rod 11 and push it along the piston rod 11 to the predetermined installation position;
[0069] S2. Use bolts to pass through the first threaded hole on the valve body 2 to fix the valve body 2 to the inner wall of the packing chamber;
[0070] S3. Sequentially mount several sealing units onto the piston rod 11 and push them to the designated position inside the valve body 2. Specifically, first fix the packing block 5 in the corresponding packing groove 13, then align the positioning strip 14 of a single sealing unit with the strip groove 9 of the valve body 2, and then push the three fixed arc blocks connected by the first arc ring 18 into the valve body 2 to the designated position.
[0071] S4. Pass the pre-installed expansion assembly of the clamping strip 15 through the through groove 16 of the valve body 2 and insert it into the corresponding clamping hole, so that the side of the clamping strip 15 with the expansion groove is aligned with one end of the second arc ring 19 in the first sliding groove 20; it should be noted that when the valve body 2 is installed on the inner wall of the packing cavity, the dimension between the circumference of the valve body 2 and the inner wall of the packing cavity is 1.5 times the length of the clamping strip 15, so as to ensure that the clamping strip 15 can be installed smoothly;
[0072] S5. The fixed end of the cylinder 29 is connected to the outer wall of the valve body 2 by bolts through the fixing strip 10, and the telescopic end of the cylinder 29 is fixedly connected to the outside of the clamping strip 15 by bolts through the positioning block.
[0073] S6. After fitting the gland 3 onto the piston rod 11 and aligning its fixing strip 10 with the strip groove 9 inside the valve body 2, push the gland 3 along the direction of the piston rod 11 so that its inner end is close to the sealing unit.
[0074] S7. Finally, use bolts to pass through the second screw hole on the cover plate of the gland 3 and screw them into the second screw hole on the valve body 2 to firmly fix the gland 3 inside the valve body 2.
[0075] The principles and beneficial effects of the above technical solution:
[0076] This installation method, through its modular structural design and clearly defined operational steps, ensures the efficiency and accuracy of the installation process. The coordination between components, such as the sliding guide between the positioning strip 14 and the slot 9, ensures the precise positioning of the sealing unit within the valve body 2, while avoiding misalignment or offset. The bolted fixing method further enhances the structural stability, enabling the assembled packing seal structure to withstand vibration and pressure under high-load operating conditions. The step-by-step installation of components such as the expansion assembly, the clamping strip 15, and the cylinder 29 simplifies the assembly process and facilitates subsequent maintenance and replacement. Furthermore, the tightening of the gland 3 and the precise arrangement of each sealing unit guarantee the overall sealing performance of the system, thereby improving the reliability and service life of the equipment.
[0077] Although the present invention has been described herein with reference to several illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications can be made to the components and / or layout of the subject matter combination within the scope of the disclosure, drawings, and claims. Besides variations and modifications to the components and / or layout, other uses will be apparent to those skilled in the art.
Claims
1. A compressor packing oil-free lubricated labyrinth seal structure, characterized in that: The device includes a valve body fixed to the inner wall of a sealing cavity and a gland for sealing one end of the valve body; the valve body is provided with several sealing units; each sealing unit includes an annular fixing member; the fixing member is coaxially fixed to the valve body; two or more packing blocks are evenly arranged on the inner side of the fixing member; the packing blocks are incomplete annular structures and are coaxial with the piston rod; the several sealing units are arranged sequentially along the axial direction of the piston rod, and adjacent fixing members are arranged at a certain angle, so that the packing blocks in each sealing unit can form a surrounding cover around the piston rod, thereby achieving a complete seal around the piston rod; the fixing member is provided with a clamping component for applying radial load to the packing blocks.
2. The compressor packing oil-free lubricated labyrinth seal structure according to claim 1, characterized in that: The fixing component consists of three fixed arc blocks; the three fixed arc blocks are fixed to each other by a connector so that the fixing component is ring-shaped; each fixed arc block has a packing groove for installing the packing block on the side facing the valve body; the packing groove passes through the fixed arc block radially along the piston rod; the side of the fixed arc block away from the piston rod contacts the inner wall of the valve body.
3. The compressor packing oil-free lubricated labyrinth seal structure according to claim 2, characterized in that: The fixed arc block has a clamping hole that communicates with the packing groove along the radial direction of the piston rod; the clamping assembly includes a clamping strip that is slidably connected in the clamping hole; one end of the clamping strip extends into the packing groove and can contact the packing block; the other end of the clamping strip slides through the valve body; a driving member is provided outside the valve body; the driving member is used to drive the clamping strip to slide along the clamping hole, so as to push the packing block to apply a radial load to the piston rod.
4. The compressor packing oil-free lubricated labyrinth seal structure according to claim 3, characterized in that: In each fixed arc block, there are two filling grooves, and the two filling grooves are isolated from each other by the fixed arc block; the number of filling blocks is the same as the number of filling grooves; the clamping hole communicates with only one of the filling grooves; the connector includes a first arc ring and a second arc ring formed by partial cutting, and the two are arranged coaxially; the interior of the first arc ring is hollow, and the second arc ring is slidably connected inside the first arc ring; Two adjacent fixed arc blocks are connected by the first arc ring; one end of the fixed arc block has a first sliding groove that connects to the abutment hole; the other end of the fixed arc block has a second sliding groove for the second arc ring to slide in; in two adjacent fixed arc blocks, one end of the second arc ring can extend into the first sliding groove of one of the fixed arc blocks, and the other end of the second arc ring is slidably connected to the second sliding groove of the other fixed arc block through a spring damper; another filling groove is provided with an extrusion member, and the extrusion member contacts the filling block in the filling groove; the outer wall of the fixed arc block has an expansion groove that connects to the abutment hole; the expansion groove is provided with an expansion component for pushing the second arc ring to slide into the second sliding groove.
5. The compressor packing oil-free lubricated labyrinth seal structure according to claim 4, characterized in that: The extrusion component includes an intermediate strip; the side wall of the other filling groove has an intermediate groove that communicates with the second sliding groove; an intermediate strip that is fixed to the second arc ring is slidably connected in the intermediate groove; and an extrusion plate that slides with the second arc ring is connected to the intermediate strip.
6. The compressor packing oil-free lubricated labyrinth seal structure according to claim 5, characterized in that: The expansion assembly includes a rotating shaft, a turbine, a swing bar, a worm gear, and a power component. The rotating shaft is rotatably connected within the expansion groove and parallel to the piston rod. A turbine is fixed on the rotating shaft, and the end of the turbine is connected to the swing bar. The swing bar and the second arc ring are located in the same plane. A gap is maintained between the end of the swing bar away from the turbine and the sidewall of the expansion groove. The worm gear is arranged in the expansion groove in a direction perpendicular to the rotating shaft. One end of the worm gear is rotatably connected to the sidewall of the expansion groove, and the other end passes through the expansion groove and extends to the valve body, rotatably connecting to the outer end of the clamping bar. The power component is fixed to the end of the clamping bar located outside the valve body and is used to drive the worm gear to rotate. The rotation of the worm gear drives the turbine to rotate, which in turn drives the free end of the swing bar to push the second arc ring to slide along the first arc ring towards the second sliding groove, pushing the intermediate bar to drive the extrusion plate to extrude the packing block, thereby applying a radial load to the piston rod.
7. The compressor packing oil-free lubricated labyrinth seal structure according to claim 6, characterized in that: The driving component is a cylinder; the cylinder is arranged in a direction parallel to the abutment bar; the fixed end of the cylinder is detachably connected to the valve body; the telescopic end of the cylinder is detachably connected to the abutment bar via a positioning block, located on the outside of the abutment bar.