Compressor filler oil-free lubrication labyrinth seal structure and installation method

Abstract

The invention discloses a compressor filler oil-free lubrication labyrinth sealing structure and an installation method, and belongs to the technical field of compressor sealing equipment. The compressor filler oil-free lubrication labyrinth sealing structure comprises a valve body, a gland, a plurality of sealing units and an abutting assembly; each sealing unit comprises a fixing piece and a filler block; the multiple sealing units are sequentially arranged in the axial direction of the piston rod, and the adjacent fixing pieces are arranged in a staggered mode at a certain angle, so that the packing block in each sealing unit can form surrounding covering on the peripheral side of the piston rod. Through the staggered packing blocks, each packing block can provide more effective and more complete sealing coverage on the peripheral side of the piston rod. Compared with a traditional continuous annular design, the staggered arrangement can be closely attached to the surface of the piston rod through the edges of the filler blocks, potential air leakage paths are eliminated, it is ensured that the sealing effect is improved, and then the sealing efficiency is improved. When the multiple sealing units which are arranged in a staggered mode are combined for use, the packing blocks can form complete surrounding covering on the peripheral side of the piston rod, and any possible leakage path is effectively blocked.

Description

Technical Field

[0001] The invention relates to the technical field of compressor sealing equipment, and in particular to an oil-free lubricating labyrinth seal structure for compressor packing and an installation method thereof. Background Art

[0002] A compressor is a device that compresses gas from a low pressure state to a high pressure state, increasing its pressure by changing the volume of the gas. Compressors are widely used in industrial production, including petrochemical, metallurgy, energy, chemical, pharmaceutical, food processing and other fields, and are one of the indispensable equipment in modern industry. According to the working principle, compressors can be divided into positive displacement compressors and dynamic compressors. Reciprocating compressors are typical representatives of positive displacement compressors. They compress gas through the reciprocating motion of the piston in the cylinder. The working principle of a reciprocating compressor is to use the reciprocating motion of the piston to periodically change the volume of gas in the cylinder, thereby completing the process of suction, compression and exhaust.

[0003] In a reciprocating compressor, the piston rod is a key component that connects the piston and the drive mechanism. Its reciprocating motion directly affects the efficiency and stability of gas compression. However, since the piston rod needs to pass through the compressor casing in a high-pressure environment, there is a greater risk of gas leakage in this area. Therefore, the piston rod must be effectively sealed.

[0004] The packing seal structure is a key device designed for piston rod sealing needs. It forms a reliable sealing interface through the close contact between the packing and the piston rod surface to prevent 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 can not only ensure the operating efficiency of the compressor, but also reduce environmental pollution and improve the safety of the equipment.

[0005] In the existing packing seal structure, multiple sealing rings and butterfly springs are usually installed in the axial offset of the piston rod to improve the airtightness. However, since each sealing ring can only cover a part of the circumference of the piston rod, the overlapping area between the sealing rings, that is, the seams of the axial offset part, may not be fully covered. These seams are usually located on the surface of the circumference of the piston rod, which is easy to form a leakage path, thereby reducing the sealing efficiency and affecting the overall airtightness performance. Summary of the invention

[0006] The purpose of the present invention is to provide a compressor packing oil-free lubricated labyrinth seal structure, aiming to solve the problem in the prior art that due to the sealing ring being an integral annular design, when multiple sealing rings are installed in axial dislocation, the sealing ring joints cannot fully cover the circumference of the piston rod, resulting in the formation of an air leakage path, thereby reducing the sealing efficiency and airtightness performance.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: A compressor packing oil-free lubricated labyrinth seal structure, comprising a valve body fixed to the inner wall of a sealing cavity and a pressure cover for sealing one end of the valve body; a plurality of sealing units are arranged in the valve body; the sealing units each comprise an annular fixing member; the fixing member is coaxially fixed in the valve body; two or more packing blocks are evenly arranged on the inner side of the fixing member; the packing block is an incomplete annular structure and is coaxial with the piston rod; the plurality of sealing units are arranged in sequence along the axial direction of the piston rod, and adjacent fixing members are staggered at a certain angle, so that the packing blocks in each sealing unit can form a surrounding coverage on the circumference of the piston rod, thereby achieving complete sealing of the circumference of the piston rod; a tightening assembly for applying a radial load to the packing block is provided on the fixing member.

[0008] A further technical solution is that the fixing part is three fixed arc blocks; the three fixed arc blocks are fixed adjacent to each other by connecting parts so that the fixing part is ring-shaped; each fixed arc block is provided with a filling groove for installing the filling block on the side facing the outside of the valve body; the filling groove penetrates the fixed arc block along the radial direction of the piston rod; the side of the fixed arc block facing away from the piston rod is in contact with the inner wall of the valve body.

[0009] A further technical solution is that the fixed arc block is provided with a tightening hole connected to the filling groove along the radial direction of the piston rod; the tightening assembly includes a tightening strip slidably connected to the tightening hole; one end of the tightening strip extends into the filling groove and can contact the filling block; the other end of the tightening strip slides through the valve body; a driving member is provided outside the valve body; the driving member is used to drive the tightening strip to slide along the tightening hole to push the filling block to apply a radial load to the piston rod.

[0010] A further technical solution is that in each fixed arc block, the number of the filling grooves is two, and the two filling grooves are isolated from each other by the fixed arc block; the number of the filling blocks is the same as the filling grooves; the abutting hole is connected to only one of the filling grooves; the connecting member includes a first arc ring and a second arc ring formed by partial cutting, and the two are coaxially arranged; the interior of the first arc ring is hollow, and the second arc ring is slidably connected in the first arc ring; two adjacent fixed arc blocks are connected by the first arc ring; one end of the fixed arc bar is provided with a first sliding groove connected to the abutting hole; the other end of the fixed arc bar is provided with a second sliding groove for sliding connection of the second arc ring; 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; an extrusion piece is provided in the other filling groove, and the extrusion piece contacts the filling block in the filling groove; the outer side wall of the fixed arc block is provided with an expansion groove connected to the abutting hole; the expansion groove is provided with an expansion component for pushing the second arc ring to slide toward the second sliding groove.

[0011] A further technical solution is that the extrusion member includes a middle strip; the side wall of the other filling groove is provided with a middle groove connected to the second sliding groove; the middle groove is slidably connected with a middle strip fixed to the second arc circle; the middle strip is connected to an extrusion plate that slides following the second arc circle.

[0012] A further technical solution is that the expansion component includes a rotating shaft, a turbine, a swing bar, a worm gear and a power piece; the rotating shaft is rotatably connected in the expansion slot and is 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 circle are located in the same plane; a gap is maintained between the end of the swing bar away from the turbine and the side wall of the expansion slot; the worm gear is arranged in the expansion slot in a direction perpendicular to the rotating shaft; one end of the worm gear is rotatably connected to the side wall of the expansion slot, and the other end passes through the expansion slot and extends to the outside of the valve body, and is rotatably connected to the outer end of the tightening bar; the power piece is fixed to the end of the tightening 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, thereby driving the free end of the swing bar to push the second arc circle to slide along the first arc circle to the second sliding groove, pushing the middle bar to drive the extrusion plate to extrude the filler block, thereby applying a radial load to the piston rod.

[0013] A further technical solution is that the driving member is a cylinder; the arrangement direction of the cylinder is parallel to the tightening strip; the fixed end of the cylinder is detachably connected to the valve body; the telescopic end of the cylinder is detachably connected to the tightening strip through a positioning block located on the outer side of the tightening strip.

[0014] In another aspect of the present invention, the installation method of the above compressor packing oil-free lubrication labyrinth seal structure comprises the following steps: S1. Put the valve body on the piston rod and push it along the piston rod to the predetermined installation position; S2. Fix the valve body on the inner wall of the packing chamber; S3. The plurality of sealing units are sequentially sleeved on the piston rod and pushed to a specified position in the valve body; S4. The pre-installed expansion assembly against the tight strip through the through groove of the valve body, and inserted into the corresponding tight hole, so that the side of the tight strip with the expansion groove is aligned with one end of the second arc circle in the first sliding groove; S5. The fixed end of the cylinder is detachably connected to the outer wall of the valve body, and the telescopic end of the cylinder is fixedly connected to the outer side of the tightening strip by bolts through a positioning block; S6. Put the gland on the piston rod and push the gland along the piston rod so that its inner end is close to the sealing unit; S7. Finally, fix the gland into the valve body.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. During the operation of this structure, the staggered arrangement of the packing blocks enables each packing block to provide more effective and complete sealing coverage around the piston rod. Compared with the traditional continuous annular design, the staggered arrangement can closely fit the surface of the piston rod through the edge of the packing block, eliminating potential leakage paths, ensuring the improvement of the sealing effect, and thus improving the sealing efficiency. When multiple sealing units with staggered arrangements are used in combination, the packing blocks can form a complete surrounding coverage around the piston rod, effectively blocking any possible leakage paths; at the same time, the staggered arrangement of the packing blocks in the multiple sealing units can achieve complete sealing around the piston rod, effectively avoiding the formation of leakage paths at the joints. The present 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.

[0016] 2. Through the synergistic effect of the drive member and the expansion component, the radial load of the piston rod by the packing block is accurately and distributedly applied. The drive member directly pushes the tightening strip to extrude the packing block, and at the same time, the expansion component cooperates with the extrusion member through the sliding second arc circle to transmit the driving force to the packing block, so that it contacts the piston rod evenly. Compared with the single load application method in the prior art, this layered and linked load transfer mechanism can not only ensure that the packing block forms a continuous and stable sealing contact with the circumference of the piston rod, but also significantly improves the response speed and adaptability of the packing sealing structure.

[0017] 3. This installation method ensures the efficiency and accuracy of the installation process through modular structural design and clear step-by-step operation. The coordination between the components, such as the sliding guide of the positioning strip and the strip groove, ensures the precise positioning of the sealing unit in the valve body, while avoiding the problem of installation misalignment or offset. The bolt fixing method further enhances the stability of the structure, so that the assembled packing sealing structure can withstand vibration and pressure under high-load operating conditions. In addition, the tightening of the gland and the precise arrangement of each sealing unit ensure the overall sealing performance of the system, thereby improving the reliability and operating life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration: Figure 1 This is a working state diagram of the packing seal structure of the present invention.

[0019] Figure 2 It is an overall three-dimensional diagram of the packing sealing structure of the present invention.

[0020] Figure 3 It is a three-dimensional diagram of the valve body of the present invention.

[0021] Figure 4 It is a three-dimensional diagram of the gland of the present invention.

[0022] Figure 5 This is a structural diagram of the sealing unit and the gland located in the valve body of the present invention.

[0023] Figure 6 It is a three-dimensional diagram of the sealing unit of the present invention.

[0024] Figure 7 It is a three-dimensional diagram of the local structure of the sealing unit of the present invention.

[0025] Figure 8 It is a three-dimensional diagram of the connection between the first arc loop and the second arc loop of the present invention.

[0026] Fig. 9 For the present invention Figure 2 A partial enlarged view of point A in the middle.

[0027] Fig.10 It is a three-dimensional diagram of the local structure of the tightening component of the present invention.

[0028] Fig.11 A three-dimensional diagram of the expansion assembly of the present invention.

[0029] Icons: 1-sealing chamber, 2-valve body, 3-pressure cover, 4-fixing part, 5-packing block, 6-tightening assembly, 7-labyrinth sealing structure, 8-card hole, 9-strip groove, 10-fixing strip, 11-piston rod, 12-connecting part, 13-packing groove, 14-positioning strip, 15-tightening strip, 16-through groove, 17-driving part, 18-first arc circle, 19-second arc circle, 20-first sliding groove, 21-extrusion part, 22-middle strip, 23-extrusion plate, 24-turbine, 25-swinging strip, 26-turbine rod, 27-power part, 28-positioning plate, 29-cylinder, 30-fixing strip. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] Example: like Figures 1 to 11 As shown, the present invention provides a compressor packing oil-free lubrication labyrinth seal structure, comprising a valve body 2 fixed to the inner wall of a sealing cavity 1 and a gland 3 for sealing one end of the valve body 2; a plurality of sealing units are arranged in the valve body 2, and this embodiment is described by taking two sealing units as an example; each of the sealing units comprises an annular fixing member 4; the fixing member 4 is coaxially fixed in the valve body 2; more than two 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, and the packing blocks 5 can be made of graphite filling material, which has excellent high temperature resistance, good self-lubricating performance and resistance to corrosion. Corrosive; the stuffing block 5 is an incomplete annular structure and is coaxial with the piston rod 11; the two sealing units are arranged in sequence along the axial direction of the piston rod 11, and the adjacent fixing members 4 are staggered at a certain angle, so that the stuffing block 5 in each sealing unit can form a surrounding coverage on the circumference of the piston rod 11, thereby achieving complete sealing of the circumference of the piston rod 11; the fixing member 4 is provided with a tightening component 6 for applying a radial load to the stuffing block 5. When the packing sealing structure is installed, a radial load is applied to the stuffing block 5 through the tightening component 6, so that the stuffing block 5 can fit more closely on the circumference of the piston rod 11.

[0032] like Figure 3 , 4As shown, a piston hole is provided at one end of the valve body 2 for the piston rod 11 to slide through; optionally, the hole wall of the piston hole can be processed into a labyrinth sealing structure 7, which increases the length and complexity of the gas leakage path through a series of annular grooves and labyrinth-shaped channels, thereby effectively reducing the leakage rate and improving the sealing effect; the end of the valve body 2 is provided with uniformly distributed first screw holes; the valve body 2 can be fixed at a predetermined position of the sealing chamber 1 by passing a bolt through the first screw hole; optionally, a clamping hole 8 is provided at the other end of the valve body 2 to be clamped with the pressure cover 3; the diameter of the clamping hole 8 is Larger than the piston hole; in order to facilitate the positioning of the gland 3, the inner wall of the clamping hole 8 is provided with evenly distributed strip grooves 9 along the axial direction; evenly distributed fixing strips 10 are fixed to the circumferential side of the cover barrel of the gland 3; evenly distributed second screw holes are provided on the cover plate of the gland 3 and the valve body 2; the diameter of the second screw hole is larger than the first screw hole; the gland 3 is fixed by means of bolts passing through the second screw holes of the cover plate and extending into the second screw holes of the valve body 2, and the end of the cover barrel located in the valve body 2 can be pressed against the fixing piece 4; a through hole is provided on the cover plate; the through hole is used to accommodate the bolts connecting the valve body 2 to the inner wall of the stuffing chamber.

[0033] The principle and beneficial effects of the above technical solution: During the operation of this structure, the staggered packing blocks 5 enable each packing block 5 to provide more effective and complete sealing coverage around the piston rod 11. Compared with the traditional continuous annular design, the staggered arrangement can closely fit the surface of the piston rod 11 through the edge of the packing block 5, eliminating potential leakage paths, ensuring the improvement of the sealing effect, and thus improving the sealing efficiency. When multiple sealing units arranged in a staggered manner are used in combination, the packing block 5 can form a complete surrounding coverage around the piston rod 11, effectively blocking any possible leakage path; at the same time, the staggered packing blocks 5 in multiple sealing units can achieve complete sealing around the piston rod 11, effectively avoiding the formation of leakage paths at the joints. Combined with the labyrinth seal structure 7, the leakage path can be further extended, so that the gas leakage rate is significantly reduced and the airtight performance is improved. The present invention adopts an oil-free lubrication design, which avoids the problem of traditional packing seals relying on lubricating oil, ensures the long-term stability of the sealing surface, and reduces the risk of lubricating oil contaminating the compressed medium, making it suitable for high-purity gas compression applications, such as hydrogen, electronic industrial gas and other special working conditions.

[0034] Compared with the conventional continuous annular packing design, the arrangement of the packing blocks 5 is more efficient through the staggered arrangement of the packing blocks 5. Conventional sealing structures usually use multiple annular packings, which often have gaps or overlapping areas during installation, resulting in unnecessary material waste. The present invention effectively reduces the use of unnecessary packing materials by arranging multiple staggered packing blocks 5 in each sealing unit. While ensuring the sealing effect, the overall material usage is reduced, thereby reducing production and manufacturing costs.

[0035] The staggered packing blocks 5 can form a more uniform and effective seal around the piston rod 11, avoiding the leakage path that may be formed at the joints in the traditional sealing structure. Through this reasonable arrangement, the pressure distribution on the sealing surface is more uniform, reducing the wear and aging of the sealing device caused by local stress concentration. Therefore, the durability of the sealing structure is improved and the service life is greatly extended.

[0036] In this embodiment, Figure 5-8 As shown, the fixing member 4 is three fixed arc blocks, which are coaxial with the valve body 2 and made of stainless steel, so that they have high corrosion resistance, mechanical strength and high temperature resistance; the three fixed arc blocks are fixed by connecting members 12 between adjacent ones, so that the fixing member 4 is annular; each fixed arc block is provided with a packing groove 13 for installing the packing block 5 on the side facing the outside of the valve body 2; 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 by an adhesive, such as epoxy resin; the packing groove 13 penetrates the inner wall of the ring of the fixed arc block along the radial direction of the piston rod 11, so as to ensure that when the tightening component 6 applies a radial load to the packing block 5, the packing block 5 can contact the circumferential side of the piston rod 11, 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, so as to ensure that a reliable support position can be obtained, to ensure the fixity and stability of the sealing unit in the valve body 2, and to avoid displacement due to vibration or movement.

[0037] A positioning strip 14 is fixedly connected to the circumferential side of each fixed arc block; the positioning strip 14 and the strip groove 9 on the inner wall of the valve body 2 are slidably matched, thereby ensuring that the fixed arc block maintains stability when sliding axially in the valve body 2 and preventing it from being offset or rotated due to vibration or other external forces, thereby ensuring the precise alignment of the packing sealing structure.

[0038] The principle and beneficial effects of the above technical solution: Compared with the overall processing of a complete annular structure, the provision of three fixed arc blocks saves more materials, and the size of a single fixed arc block is smaller, the processing time is shortened, the equipment requirements are reduced, and the manufacturing cost is further reduced.

[0039] In this embodiment, Figure 3 , 5-9, a locking hole connected to the stuffing groove 13 is opened on the circumferential side of the fixed arc block along the radial direction of the piston rod 11; the locking assembly 6 includes a locking strip 15 slidably connected in the locking hole; one end of the locking strip 15 extends into the stuffing groove 13 and can contact the stuffing block 5; the other end of the locking strip 15 slides through the valve body 2; specifically, a through groove 16 is opened in the radial direction of the valve body 2 for the sliding connection of the locking strip 15; a driving member 17 is provided outside the valve body 2; the driving member 17 is used to drive the locking strip 15 to slide along the locking hole, so as to push the stuffing block 5 to apply a radial load to the piston rod 11.

[0040] The principle and beneficial effects of the above technical solution: The driving member 17 provides external force, and transmits the load to the packing block 5 through the pressing strip 15, thereby pressing the packing block 5. After being radially stressed, the packing block 5 can evenly distribute the pressure, and closely adhere to the surface of the piston rod 11, forming an efficient airtight sealing effect.

[0041] In this embodiment, Figure 6-8 As shown, the number of the packing slots 13 is two, and the two packing slots 13 are separated from each other by the fixed arc block; the number of the packing blocks 5 is the same as the packing slots 13; the angle of the cross-section extension line of each fixed arc block is greater than 60° and less than 120°; this ensures that the packing blocks 5 are evenly distributed. When the number of fixed arc blocks in each sealing unit is only three, the fixed arc can be arranged around the piston rod 11, so that the packing blocks 5 can form a full coverage around 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 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 distributed, so that the redundant material of the packing blocks 5 is reduced while ensuring the sealing performance, which helps to save material costs.

[0042] Each abutting hole is connected to only one of the filling grooves 13; the connecting member 12 includes a first arc ring 18 and a second arc ring 19 formed by partial cutting, and the two are coaxially arranged; the interior of the first arc ring 18 is hollow, and the second arc ring 19 is slidably connected in the first arc ring 18; two adjacent fixed arc blocks are fixedly connected by the first arc ring 18; one end of the fixed arc bar is provided with a first sliding groove 20 connected to the abutting hole; the cross-sectional shape of the first sliding groove 20 is arc-shaped; the other end of the fixed arc bar is provided with a second sliding groove for sliding connection of the second arc ring 19; 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 piece 21 connected to the second arc ring 19, and the extrusion piece 21 is in contact with the filling block 5 in the filling groove 13; the outer side wall of the fixed arc block close to the first arc ring 18 is provided with an expansion groove connected to the tightening hole; the expansion groove is provided with an expansion component for pushing the second arc ring 19 to slide toward the second sliding groove.

[0043] The principle and beneficial effects of the above technical solution: When the driving member 17 drives the tightening strip 15 to squeeze the filling block 5 in one of the filling grooves 13 to apply a radial load to the piston rod 11; the expansion component pushes one end of the second arc circle 19 in the first sliding groove 20, and the second arc circle 19 slides along the first arc circle 18 and drives the connected extrusion member 21 to move, so that the extrusion member 21 squeezes the filling block 5, thereby applying a radial load to the piston rod 11.

[0044] Through the synergistic effect of the driving member 17 and the expansion assembly, the radial load of the piston rod 11 by the packing block 5 is accurately and distributedly applied. The driving member 17 directly pushes the abutting strip 15 to squeeze the packing block 5, and at the same time, the expansion assembly cooperates with the extrusion member 21 through the sliding second arc ring 19 to transmit the driving force to the packing block 5, so that it contacts the piston rod 11 evenly. Compared with the single load application method in the prior art, this layered and linked load transfer mechanism can not only ensure that the packing block 5 forms a continuous and stable sealing contact with the circumference of the piston rod 11, but also significantly improve the response speed and adaptability of the packing sealing structure.

[0045] By cooperating with the expansion component, the first arc circle 18 and the second arc circle 19 of the driving member 17, the driving force of the driving member 17 can be dispersed, thereby avoiding excessive stress on a single filler block 5 or a contact point, and improving the stability and durability of the filler sealing structure under high pressure, high temperature or high-speed movement conditions.

[0046] By cooperating with the expansion assembly, the first arc circle 18 and the second arc circle 19 of the driving member 17, the packing sealing structure has an automatic compensation function. When the packing block 5 is worn or has a slight change in size due to long-term use, effective sealing can still be achieved through load adjustment without frequent maintenance.

[0047] The above-mentioned distributed load application method can reduce the local friction between the packing block 5 and the piston rod 11, thereby extending the life of the packing block 5 and reducing the maintenance and replacement frequency, further optimizing the life cycle cost of the packing sealing structure.

[0048] 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, that is, the expansion component stops applying force, thereby avoiding the packing block 5 from continuously applying excessive load, reducing the wear of the packing block 5 and the piston rod 11, and extending the service life of the packing sealing structure.

[0049] In this embodiment, Figure 7 , 8 As shown, the extrusion member 21 includes a middle strip 22; the side wall of the other filling groove 13 is provided with an middle slot connected to the second sliding groove; the cross-sectional shape of the middle slot is arc-shaped, and the middle slot is coaxial with the other filling groove 13 and the second sliding groove; the middle strip 22 fixed to the second arc ring 19 is slidably connected in the middle slot; the middle strip 22 is connected to an extrusion plate 23 sliding along with the second arc ring 19; the second extrusion plate 23 is slidably connected to the other filling groove 13.

[0050] The principle and beneficial effects of the above technical solution: When the second arc ring 19 slides under the push of the expansion component, it drives the middle strip 22 fixedly connected thereto to slide synchronously in the middle groove. Since the cross-sectional shape of the middle groove is arc-shaped and coaxial with the other packing groove 13, the movement trajectory of the middle strip 22 can maintain consistency with the packing groove 13. At the same time, the middle strip 22 transmits radial force to the packing block 5 in the packing groove 13 through the connected second extrusion plate 23, causing the packing block 5 to closely contact the surface of the piston rod 11, thereby realizing the radial load application to the piston rod 11 and ensuring its sealing effect.

[0051] The middle groove is coaxial with the filling groove 13 and the second sliding groove, ensuring the precise movement trajectory of the middle strip 22 and the second extrusion plate 23, and evenly distributing the contact force with the filling block 5, thus avoiding the reduction of sealing performance due to eccentricity or offset.

[0052] The middle strip 22 and the extrusion plate 23 connected by sliding connection can realize accurate transmission and dynamic adjustment of force. Even if the piston rod 11 is slightly deformed due to working conditions, dynamic sealing compensation can be realized through the flexible transmission mechanism of the middle strip 22 to ensure sealing reliability.

[0053] In this embodiment, Figure 8 , 10 As shown in Figure 11, the expansion assembly includes a rotating shaft, a turbine 24, a swing bar 25, a worm rod 26 and a power piece 27; the two ends of the rotating shaft are rotatably connected in the expansion slot and are parallel to the piston rod 11; a turbine 24 is fixed on the rotating shaft, and the end of the turbine 24 is connected to the swing bar 25; the swing bar 25 and the second arc circle 19 are located in the same plane; a gap is maintained between the end of the swing bar 25 away from the turbine 24 and the side wall of the expansion slot, so that direct friction between the swing bar 25 and the expansion slot during movement can be avoided, thereby reducing wear; the worm rod 26 is arranged in the expansion slot in a direction perpendicular to the rotating shaft; the worm rod 26 One end is rotatably connected to the side wall of the expansion slot, and the other end passes through the expansion slot and extends to the outside of the valve body 2, and is rotatably connected to the outer end of the clamping strip 15; the power member 27 is fixed to the end of the clamping strip 15 outside the valve body 2 through the positioning plate 28 and is bolted, and is used to drive the worm rod 26 to rotate; specifically, the power member 27 adopts a servo motor, which can accurately control the rotation angle; the rotation of the worm rod 26 drives the turbine 24 to rotate, and then drives the free end of the swing bar 25 to push the second arc circle 19 to slide along the first arc circle 18 to the second sliding groove, and pushes the middle bar 22 to drive the extrusion plate 23 to extrude the filler block 5, thereby applying a radial load to the piston rod 11.

[0054] The principle and beneficial effects of the above technical solution: The worm is driven to rotate by the power member 27, and the worm is meshed with the turbine 24 to achieve stable rotation of the turbine 24. The rotation of the turbine 24 further drives the swing bar 25 fixedly connected thereto to rotate, and the rotation of the swing bar 25 pushes one end of the second arc circle 19 in the first sliding groove 20 to slide in a predetermined direction. Since the second arc circle 19 is slidably connected to the first arc circle 18, the movement of the second arc circle 19 is transmitted to the extrusion plate 23 through the middle bar 22, so that the extrusion plate 23 produces an extrusion effect on the filling block 5 in the other filling groove 13, thereby applying a uniform radial load to the piston rod 11.

[0055] In this embodiment, Fig. 9 As shown, the driving member 17 is a cylinder 29; the arrangement direction of the cylinder 29 is parallel to the tightening 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 with a fixing strip 30; the fixing strip 10 and the valve body 2 are connected by circumferential bolts; the telescopic end of the cylinder 29 is detachably connected to the tightening strip 15 through a positioning block located on the outer side of the tightening strip 15; specifically, the positioning block is connected to the outer side wall of the tightening strip 15 by bolts.

[0056] The principle and beneficial effects of the above technical solution: The telescopic end of the cylinder 29 is detachably connected to the outer side of the tightening strip 15 through a positioning block. When the telescopic end of the cylinder 29 is retracted, it drives the tightening strip 15 to slide radially, thereby squeezing the filling block 5 close to the tightening strip 15, so that the filling block 5 is in close contact with the piston rod 11, forming an efficient seal.

[0057] The connection through the positioning block simplifies the installation and maintenance process, and ensures that the packing block 5 is evenly stressed during the sealing process, thereby effectively improving the sealing performance and system reliability.

[0058] The present invention also provides a method for installing an oil-free lubricated labyrinth seal structure for a compressor packing, comprising the following steps: S1. The valve body 2 is mounted on the piston rod 11 and pushed along the piston rod 11 to a predetermined installation position; S2. Use a bolt to pass through the first screw hole on the valve body 2 to fix the valve body 2 on the inner wall of the packing chamber; S3. Several sealing units are sequentially sleeved on the piston rod 11 and pushed to the designated position in the valve body 2. The specific operation is: 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 as a whole to the designated position; S4. Pass the pre-installed expansion assembly of the abutting strip 15 through the through groove 16 of the valve body 2 and insert it into the corresponding abutting hole, so that the side of the abutting strip 15 with the expansion groove is aligned with one end of the second arc 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 abutting strip 15, so as to ensure that the abutting strip 15 can be installed smoothly; S5. The fixed end of the cylinder 29 is bolted to the outer wall of the valve body 2 through the fixing strip 10, and the telescopic end of the cylinder 29 is bolted to the outer side of the tightening strip 15 through the positioning block; S6. The gland 3 is mounted on the piston rod 11, and after the fixing strip 10 is aligned with the strip groove 9 in the valve body 2, the gland 3 is pushed along the direction of the piston rod 11 so that its inner end is close to the sealing unit; S7. Finally, use a bolt to pass through the second screw hole on the cover plate of the gland 3 and screw it into the second screw hole on the valve body 2 to firmly fix the gland 3 in the valve body 2.

[0059] The principle and beneficial effects of the above technical solution: This installation method ensures the efficiency and accuracy of the installation process through modular structural design and clear step-by-step operation. The coordination between the components, such as the sliding guide of the positioning strip 14 and the strip groove 9, ensures the precise positioning of the sealing unit in the valve body 2, while avoiding the problem of installation misalignment or offset. The bolt fixing method further enhances the stability of the structure, so that the assembled packing sealing structure can withstand vibration and pressure under high-load operating conditions. By installing the expansion components, the tightening strip 15 and the cylinder 29 in steps, the assembly process is simplified, and convenience is provided for subsequent maintenance and replacement. In addition, the tightening of the gland 3 and the precise arrangement of the sealing units ensure the overall sealing performance of the system, thereby improving the reliability and service life of the equipment.

[0060] Although the present invention is described herein with reference to a number of illustrative embodiments of the present invention, it will be appreciated that those skilled in the art may devise many other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure, drawings, and claims, a variety of variations and modifications may be made to the components and / or layout of the subject combination layout. In addition to the variations and modifications made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A compressor packing oil-free lubrication labyrinth seal structure, characterized in that: It comprises a valve body fixed to the inner wall of the sealing cavity and a pressure cover for sealing one end of the valve body; a plurality of sealing units are arranged in the valve body; the sealing units each comprise an annular fixing part; the fixing part is coaxially fixed in the valve body; two or more stuffing blocks are evenly arranged on the inner side of the fixing part; the stuffing block is an incomplete annular structure and is coaxial with the piston rod; the plurality of sealing units are arranged in sequence along the axial direction of the piston rod, and adjacent fixing parts are staggered at a certain angle, so that the stuffing blocks in each sealing unit can form a surrounding coverage on the circumference of the piston rod, thereby achieving complete sealing of the circumference of the piston rod; a tightening component for applying a radial load to the stuffing block is provided on the fixing part.

2. The compressor packing oil-free lubrication labyrinth seal structure according to claim 1, characterized in that: The fixing member is three fixed arc blocks; the three fixed arc blocks are fixed adjacent to each other by connecting members so that the fixing member is annular; each fixed arc block is provided with a packing groove for installing the packing block on the side facing the outside of the valve body; the packing groove penetrates the fixed arc block along the radial direction of the piston rod; the side of the fixed arc block facing away from the piston rod is in contact with the inner wall of the valve body.

3. The compressor packing oil-free lubrication labyrinth seal structure according to claim 2, characterized in that: The fixed arc block is provided with a tightening hole connected to the filling groove along the radial direction of the piston rod; the tightening assembly includes a tightening strip slidably connected in the tightening hole; one end of the tightening strip extends into the filling groove and can contact the filling block; the other end of the tightening strip slides through the valve body; a driving member is provided outside the valve body; the driving member is used to drive the tightening strip to slide along the tightening hole to push the filling block to apply a radial load to the piston rod.

4. The compressor packing oil-free lubrication labyrinth seal structure according to claim 3 is characterized in that: In each fixed arc block, the number of the filling grooves is two, and the two filling grooves are isolated from each other by the fixed arc block; the number of the filling blocks is the same as the filling grooves; the abutment hole is connected to only one of the filling grooves; the connecting member includes a first arc ring and a second arc ring formed by partial cutting, and the two are coaxially arranged; the interior of the first arc ring is hollow, and the second arc ring is slidably connected in the first arc ring; Two adjacent fixed arc blocks are connected by the first arc ring; one end of the fixed arc bar is provided with a first sliding groove connected to the abutting hole; the other end of the fixed arc bar is provided with a second sliding groove for sliding connection of the second arc ring; 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 slidingly connected to the second sliding groove of the other fixed arc block through a spring damper; an extrusion piece is provided in the other filling groove, and the extrusion piece is in contact with the filling block in the filling groove; an extension groove is provided on the outer wall of the fixed arc block that is connected to the abutting hole; an extension component is provided in the extension groove for pushing the second arc ring to slide toward the second sliding groove.

5. The compressor packing oil-free lubrication labyrinth seal structure according to claim 4, characterized in that: The extrusion piece includes a middle strip; the side wall of the other filling slot is provided with a middle slot connected to the second sliding slot; the middle slot is slidably connected with a middle strip fixed to the second arc ring; the middle strip is connected with an extrusion plate sliding along with the second arc ring.

6. The compressor packing oil-free lubrication 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 piece; the rotating shaft is rotatably connected in the expansion slot and is 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 circle are located in the same plane; a gap is maintained between the end of the swing bar facing away from the turbine and the side wall of the expansion slot; the worm gear is arranged in the expansion slot in a direction perpendicular to the rotating shaft; one end of the worm gear is rotatably connected to the side wall of the expansion slot, and the other end passes through the expansion slot and extends outside the valve body, and is rotatably connected to the outer end of the tightening bar; the power piece is fixed to the end of the tightening 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, thereby driving the free end of the swing bar to push the second arc circle to slide along the first arc circle to the second sliding groove, pushing the middle bar to drive the extrusion plate to extrude the filler block, thereby applying a radial load to the piston rod.

7. The compressor packing oil-free lubrication labyrinth seal structure according to claim 6, characterized in that: The driving member is a cylinder; the arrangement direction of the cylinder is parallel to the abutment strip; 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 strip via a positioning block located on the outer side of the abutment strip.

8. The installation method of the compressor packing oil-free lubrication labyrinth seal structure according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Put the valve body on the piston rod and push it along the piston rod to the predetermined installation position; S2. Fix the valve body on the inner wall of the packing chamber; S3. The plurality of sealing units are sequentially sleeved on the piston rod and pushed to a specified position in the valve body; S4. The pre-installed expansion assembly against the tight strip through the through groove of the valve body, and inserted into the corresponding tight hole, so that the side of the tight strip with the expansion groove is aligned with one end of the second arc circle in the first sliding groove; S5. The fixed end of the cylinder is detachably connected to the outer wall of the valve body, and the telescopic end of the cylinder is fixedly connected to the outer side of the tightening strip by bolts through a positioning block; S6. Put the gland on the piston rod and push the gland along the piston rod so that its inner end is close to the sealing unit; S7. Finally, fix the gland into the valve body.

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