Method for mounting a rotary seal assembly, rotary seal assembly

Abstract

The application provides a rotary sealing assembly installation method for installing a sealing assembly including a packing to a sealing surface of a rotary device selected from rotary dryers, rotary calciners and the like. The rotary sealing assembly installation method comprises the following steps: inspecting the sealing assembly to be installed; confirming the tightening torque of fasteners for fixing the packing gland and the packing case; then installing each annular packing according to the corresponding steps (especially controlling the spacing during installation); and finally step-by-step fastening the packing gland and the packing case. The sealing assembly can be correctly installed in place according to the installation design drawing, the sealing reliability is improved, the sealing performance is improved, material leakage is reduced, and the operation rate of the device is improved. Moreover, the fasteners such as bolts on the packing gland are gradually fastened according to the corresponding tightening torque, which ensures the required tightness of the sealing and does not increase additional friction resistance.

Description

Technical Field

[0001] This invention belongs to the field of rotary equipment sealing technology, specifically relating to an installation method for a rotary sealing assembly and the rotary sealing assembly itself. Background Technology

[0002] Both the feed end and the sealing end of the rotary dryer and the rotary calciner are equipped with sealing components. The sealing components typically include components such as bushings, packing, perforated rings, stuffing boxes, packing glands, and fasteners, and are the core structure to ensure the stable operation of the equipment.

[0003] Sealing components must be installed according to the correct steps and procedures to fully realize their sealing performance. However, existing installation methods mainly rely on manual experience, and incorrect, non-standard, or inappropriate installation not only wastes sealing elements but also causes material leakage, leading to decreased product quality, environmental pollution, and production downtime losses. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides an installation method for a rotary sealing assembly. This method ensures the reliability of the sealing assembly installation, improves sealing performance, reduces material leakage, and increases equipment operating rate.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for installing a rotary sealing assembly includes the following steps:

[0007] S1: Inspect all components in the sealing assembly to be installed;

[0008] S2: The first annular packing is wound around the bushing and pushed in axially to fit tightly against the bottom of the stuffing box; then, four positions are selected at 90-degree intervals along the circumferential direction of the surface of the first annular packing, and the axial distance from each position to the end face of the stuffing box near the packing gland is measured respectively, and the difference between the four measured axial distances and the design value is controlled to be less than or equal to the design tolerance.

[0009] S3: The second annular packing is wound around the bushing and pushed axially to fit tightly against the first annular packing; then, four positions are selected at 90-degree intervals along the circumferential direction of the surface of the second annular packing, and the axial distance from each position to the end face of the stuffing box near the stuffing gland is measured. The difference between the measured value and the design value of the four axial distances is controlled to be less than or equal to the design tolerance.

[0010] S4: Following the installation and measurement control method in step S3, install the remaining annular packing in sequence;

[0011] S5: Tighten the packing gland and the stuffing box uniformly with fasteners to 15%-30% of the preset target torque of the fasteners. During the tightening process, ensure that the radial centering and axial uniform compression of the packing gland are ensured. After tightening to 20% of the preset target torque, measure the axial distance A between the fasteners and the stuffing box and the packing gland, the radial distance B between the packing gland and the stuffing box, and the radial distance C between the bushing and the packing gland. Each distance is measured at four positions at 90-degree intervals along the circumferential direction. The difference between the measured value and the design value at the four positions of each distance is less than or equal to the design tolerance.

[0012] S6: Tighten the fasteners uniformly to 100% of the preset target torque. During the tightening process, ensure that the packing gland is radially aligned and axially uniformly pressed. After tightening to 100% of the preset target torque, measure the spacing A, spacing B, and spacing C again, and control that the difference between the measured values ​​at the four positions of each spacing and the design value is less than or equal to the design tolerance.

[0013] The cut joints of each annular packing are tightly fitted.

[0014] In the above, the design tolerance refers to the error range between the measured actual spacing and the allowable spacing.

[0015] In one optional implementation, in step S1, each component of the sealing assembly to be installed is inspected, including the bushing, packing, packing gland, fasteners, etc., mainly to check whether each component meets the corresponding requirements in the drawings / instructions of the rotary sealing assembly.

[0016] The specific inspection items are listed below:

[0017] Inspect the material, dimensions, and surface roughness of the bushing. A portable spectrometer can be used for this purpose; verify that the material composition displayed on the spectrometer screen meets the material requirements specified in the drawing. Calipers can be used to check the outer diameter of the bushing and compare it with the tolerances on the drawing. A surface roughness tester can be used to check the surface finish of the bushing and compare it with the requirements on the drawing.

[0018] Inspect the packing material, condition, cross-sectional dimensions, cutting length, and cuts. Specifically, check the packing packaging label and verify it against the drawing requirements; check the packing's elasticity, fibers, and surface for any obvious damage; use a ruler or other tools to check the packing's cross-sectional dimensions and verify them against the drawing requirements; check the cuts at the overlap of each packing ring, ensuring the cuts are smooth; the packing should be cut according to the quantity and dimensions required by the design drawings, with each ring of packing forming a single piece, i.e., with only one joint; when cutting, wrap the packing around the surface of the sealing part (or a mandrel with the same shaft diameter) once to confirm the length before cutting. Use a sharp utility knife (or a special tool); do not use saw blades or angle grinders for cutting, as this may result in uneven cuts at the overlaps. Ensure the cut packing remains clean and is placed flat on a clean surface. The two ends of a single piece of packing are cut and joined tightly to form the aforementioned ring-shaped packing.

[0019] Check the material and dimensions of the packing gland. If using a portable spectrometer, verify that the material composition displayed on the spectrometer screen meets the material requirements indicated on the drawing. Use tools such as rulers and calipers to check the dimensions (inner diameter, outer diameter, length, etc.) of the packing gland and verify them against the requirements of the drawing.

[0020] Check the material, specifications, quantity, and condition of the fasteners, such as the stamped markings and packaging labels on the fastener surface, and verify them against the material requirements in the drawings; use tools such as rulers and calipers to check the specifications (model, grade, and length) of the fasteners, check the quantity of the fasteners (e.g., whether they are double nuts), and verify them against the requirements in the drawings; check whether the packing gland studs are deformed, and whether the threads have rust marks or spots, etc.

[0021] In an optional implementation, step S1 further includes checking the material and dimensions of the perforated ring, such as: for perforated rings made of metal, using a portable spectrometer to check whether the material composition displayed on the spectrometer screen meets the material requirements indicated in the drawing; for perforated rings made of non-metallic materials, checking the packaging label of the perforated ring and verifying it against the requirements of the drawing; the dimensions of the perforated ring (cross-sectional dimensions, opening size and opening position, etc.) can be checked using tools such as rulers and calipers and verified against the requirements of the drawing.

[0022] In one alternative embodiment, if a leak is found in the packing seal during the operation of the equipment containing the rotary seal assembly, the fasteners can be further tightened.

[0023] In one alternative implementation, the preset target torque for the fastener is calculated using industry-standard methods based on the fastener's specifications and design conditions (e.g., see Mechanical Design Handbook (Edited by Cheng Daxian, 5th Edition), Volume 2, Section 3.5.1, Calculation of Tightening Torque), or obtained from a manual or standard concerning sealing components in the purchased rotary device. Furthermore, confirming the preset target torque for the fastener requires determining whether it is under unlubricated or lubricated conditions.

[0024] In one alternative embodiment, the cut joints of each of the annular packings are staggered relative to each other in the circumferential direction.

[0025] In one alternative embodiment, the notch joints of each of the annular packings have an offset angle in the circumferential direction; preferably, the offset angle is at least 45 degrees.

[0026] In one alternative embodiment, the offset angle of the notch joint of each of the annular packings in the circumferential direction is 90 degrees.

[0027] In one alternative embodiment, the cuts of each of the annular packings are independently selected from flush cuts or bevel cuts.

[0028] In an optional embodiment, the above-described method for installing the rotary sealing assembly further includes the step of installing a perforated ring between the second annular packing and the last annular packing.

[0029] The hole is placed around the bushing and pushed in axially to fit tightly against the corresponding annular packing. Then, four positions are selected at 90-degree intervals on the circumferential direction of the hole ring surface. The axial distance from each position to the end face of the stuffing box near the packing gland is measured. The error between the measured value and the design value of the four axial distances is controlled to be less than or equal to the design tolerance.

[0030] Furthermore, the opening on the perforated ring is aligned with the external connection port of the perforated ring.

[0031] During the installation of the aforementioned perforated ring, it is essential to ensure that it is placed in the correct position. The opening on the perforated ring should be aligned with the external pipe opening to facilitate the backflushing of gas or the addition of grease into the rotary sealing assembly through the external pipe opening.

[0032] In one optional embodiment, after installing the perforated ring and then immediately installing the corresponding annular packing, four positions spaced 90 degrees apart along the circumference of the perforated ring surface are selected. The axial distance from each position to the end face of the stuffing box near the packing gland is measured, and the error between the measured values ​​and the design values ​​of the four axial distances is controlled to be less than or equal to the design tolerance. Furthermore, the perforated ring and the annular packing on both sides are axially tightly fitted.

[0033] In one alternative embodiment, grease is applied to the surface of the annular ring before installation.

[0034] In one alternative embodiment, lubricant is applied to the surface of each of the annular fillers before installation.

[0035] In one alternative embodiment, the fasteners for securing the packing gland to the stuffing box include bolts on the stuffing box connecting flange.

[0036] The present invention also provides a rotary sealing assembly, which is installed using the above-described installation method for rotary sealing assemblies.

[0037] Beneficial effects

[0038] 1. The present invention provides an installation method for a rotary sealing assembly, used to install a sealing assembly, including packing, onto the sealing surface of a rotary device, such as a rotary dryer or a rotary calcining furnace. The installation method includes the following steps: inspecting the sealing assembly to be installed; confirming the tightening torque of the fasteners used to fix the packing gland and stuffing box; then installing each annular packing according to the corresponding steps (especially controlling the spacing during installation); and finally tightening the packing gland and stuffing box step by step. This ensures that the sealing assembly is correctly installed according to the installation design drawings, improving sealing reliability, sealing performance, reducing material leakage, and increasing equipment operating rate. Furthermore, the fasteners on the packing gland, such as bolts, are gradually tightened according to the corresponding tightening torque, ensuring the required tightness for sealing without increasing additional frictional resistance.

[0039] 2. The installation method of the rotary sealing assembly provided by the present invention, by installing a perforated ring and connecting the perforated ring to an external pipe, allows for the introduction of lubricant or purging gas according to sealing requirements, thereby improving the working condition of the sealing element. Attached Figure Description

[0040] The accompanying drawings used in the embodiments are briefly described below. The drawings described below are merely some embodiments of the present invention and are not intended to limit this application. Those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0041] Figure 1 A schematic flowchart illustrating an installation method for a rotary sealing assembly provided by the present invention;

[0042] Figure 2 This is a schematic diagram of the structure of the rotary device without annular packing in Embodiment 1 of the present invention;

[0043] Figure 3 This is a schematic diagram of the structure after the first annular packing is installed in Embodiment 1 of the present invention;

[0044] Figure 4 This is a schematic diagram of the structure for inspecting four positions on the circumferential direction of the surface of the annular packing in Embodiment 1 of the present invention;

[0045] Figure 5 This is a schematic diagram of the structure after installing the corresponding annular packing and perforated ring in Embodiment 1 of the present invention;

[0046] Figure 6 This is a schematic diagram of the structure when the packing gland is pressed in Embodiment 1 of the present invention;

[0047] Figure 7 This is a schematic diagram of the structure of the rotary sealing assembly after installation in Embodiment 2 of the present invention;

[0048] Figure 8 This is a schematic diagram of the structure of the rotary sealing assembly after installation in Embodiment 3 of the present invention.

[0049] In the diagram, 1 is the rotating shaft, 2 is the bushing, 3 is the support, 4 is the stuffing box, 5 is the external connection port of the perforated ring, 6 is the packing gland bolt, 7 is the packing gland nut, 8 is the packing gland, 9 is the 4th ring of packing, 10 is the perforated ring, 11 is the 3rd ring of packing, 12 is the 2nd ring of packing, 13 is the 1st ring of packing, 14 is the 5th ring of packing, and 15 is the 6th ring of packing. Detailed Implementation

[0050] The present invention will now be described in detail through embodiments. It should be noted that the following embodiments are only for further illustration of the present invention and should not be construed as limiting the scope of protection of the present invention. Those skilled in the art can make some non-essential improvements and adjustments to the present invention based on the content of the present invention.

[0051] In the description of this disclosure, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0052] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "connection," "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0053] Furthermore, the terms "first," "second," "third," "fourth," "fifth," "sixth," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The technical features involved in the different embodiments of this disclosure described below can be combined with each other as long as they do not constitute a conflict with each other.

[0054] The following will describe in detail specific embodiments of the installation method of the rotary sealing assembly of the present invention with reference to the accompanying drawings.

[0055] Example 1

[0056] This embodiment provides a method for installing a rotary sealing assembly for sealing the feed end of a PTA steam pipe rotary dryer. The rotary sealing assembly includes a rotating shaft 1, a bushing 2, packing, a perforated ring 10, a stuffing box 4, a stuffing gland 8, a support 3, and fasteners, etc. A flowchart illustrating the installation method is shown below. Figure 1 As shown, it includes the following steps:

[0057] Step S10, inspect all sealing components to be installed, including:

[0058] Step S1001, Inspection of bushing 2, includes:

[0059] (1) Material inspection of bushing 2: Use a portable spectrometer to check whether the material composition displayed on the spectrometer screen meets the material requirements marked on the drawing;

[0060] (2) Dimensional inspection of bushing 2: Use calipers to check the outer diameter of the bushing and compare it with the tolerance of the drawing;

[0061] (3) Surface roughness inspection of bushing 2: The surface finish of the bushing is inspected using a roughness tester and compared with the requirements of the drawing;

[0062] Step S1002, packing inspection, includes:

[0063] (1) Material inspection of packing: Check the packaging label of the packing and verify it against the requirements of the drawings;

[0064] (1) Packing condition inspection: Check the elasticity of the packing, whether there is obvious damage to the fibers and surface, etc.;

[0065] (2) Measurement of packing cross-sectional dimensions: Use a ruler or other tools to check the cross-sectional dimensions of the packing and verify them against the requirements of the drawings;

[0066] (3) Length check of packing: The dimensions of each ring of packing need to be confirmed with the length required by the drawing. Each ring of packing should be a whole piece, that is, only one joint (that is, the cut ends of one packing are tightly fitted together to form a ring of packing, and the tightly fitted part of the cut ends forms the cut joint of the ring of packing). The cut packing should be kept clean and placed flat on a clean surface.

[0067] (4) Inspection of packing cuts: Inspect the cuts at the overlap of each packing ring. The cuts should be flat. The cuts can be flush or beveled.

[0068] Step S1003, inspection of stuffing box 4, includes:

[0069] (1) Material inspection of stuffing box 4: Use a portable spectrometer to check whether the material composition displayed on the spectrometer screen meets the material requirements marked on the drawing;

[0070] (2) Measurement of the size of the stuffing box: Use tools such as rulers and calipers to check the size of the stuffing box (inner diameter, depth, etc.) and check it against the requirements of the drawings.

[0071] Step S1004, inspection of packing gland 8, includes:

[0072] (1) Material inspection of packing gland 8: Use a portable spectrometer to check whether the material composition displayed on the spectrometer screen meets the material requirements marked on the drawing;

[0073] (2) Dimension measurement of packing gland: Use tools such as rulers and calipers to check the dimensions of the packing gland (inner diameter, outer diameter, length, etc.) and verify them against the requirements of the drawings.

[0074] Step S1005, inspection of the hole ring 10, includes:

[0075] (1) Material inspection of the hole ring 10: For the hole ring made of metal, a portable spectrometer is used to check whether the material composition displayed on the spectrometer screen meets the material requirements marked on the drawing; for the hole ring made of non-metallic material, the packaging label of the hole ring is checked and compared with the requirements of the drawing.

[0076] (2) Measurement of the dimensions of the hole ring 10: Use tools such as rulers and calipers to check the dimensions of the hole ring (cross-sectional dimensions, hole size and hole position, etc.) and verify them against the requirements of the drawings.

[0077] Step S1006, fastener inspection, includes:

[0078] (1) Material inspection of fasteners: Check the steel stamp marks and packaging labels on the surface of the fasteners and verify them against the material requirements of the drawings;

[0079] (2) Check the specifications and quantity of fasteners: Use tools such as rulers and calipers to check the specifications (model, grade and length) of the fasteners, check the quantity of the fasteners (whether they are double nuts); and check them against the requirements of the drawings.

[0080] (3) Check the condition of the studs: Check whether the studs of the packing gland are deformed, and the threads should not have rust marks or spots.

[0081] Step S20: Calculation and confirmation of fastener tightening torque. The tightening torque of fasteners (bolts, studs) should be calculated according to their specifications and design conditions or found in manuals and standards. At the same time, it should be confirmed whether the torque value is in a lubricated or unlubricated state. In this embodiment, it is confirmed by looking up the drawing of the rotary seal assembly.

[0082] Step S30, Figure 2 This is a structural diagram of a rotary equipment without annular packing. The axial distance between the support 3 and the end face of the stuffing box 8 near the packing gland 8 is L0. After the outer surface of the first ring of packing 13 (i.e., the first annular packing) is coated with grease, it is wound around the bushing and pushed axially until it is tightly fitted against the bottom of the stuffing box 4 (e.g., ...). Figure 3 As shown), and the joints of the cuts in the first ring of packing 13 are tightly fitted; then, four positions P1, P2, P3 and P4, which are distributed at 90-degree intervals in sequence, are selected on the circumferential direction of the surface of the first ring of packing 13 (as shown). Figure 4 As shown), and measure the axial distance L1 from the four positions P1, P2, P3 and P4 to the end face of the stuffing box 4 near the stuffing gland 8 (as shown). Figure 3 As shown in the figure, if the difference between the measured four axial spacings L1 and the designed axial spacing does not exceed the design tolerance on the drawing, the subsequent steps can be carried out. If it exceeds the design tolerance on the drawing, it is necessary to adjust so that the difference between the actual measured four axial spacings L1 and the designed axial spacing does not exceed the design tolerance requirement on the drawing.

[0083] Step S40: After applying grease to the surface of the second ring of packing 12, wrap it around the bushing and push it axially to fit tightly against the first ring of packing 13. Figure 5As shown, the joint of the cut of the second ring of packing 12 fits tightly and is offset from the cut of the first ring of packing 13 at a certain angle in the circumferential direction; the offset angle is at least 45 degrees, and in this embodiment, the offset angle is 90 degrees. Then, four positions P1, P2, P3, and P4 (e.g., ...) are selected in the circumferential direction on the surface of the second ring of packing 12 at intervals of 90 degrees. Figure 4 As shown), and measure the axial distance L2 from the four positions P1, P2, P3 and P4 to the end face of the stuffing box 4 near the stuffing gland 8 (as shown). Figure 5 As shown in the figure, if the difference between the measured four axial spacings L2 and the designed axial spacing does not exceed the design tolerance on the drawing, the subsequent steps can be carried out. If it exceeds the design tolerance on the drawing, it is necessary to adjust so that the difference between the actual measured four axial spacings L2 and the designed axial spacing does not exceed the design tolerance requirement on the drawing.

[0084] Step S50: After applying grease to the surface of the third ring of packing 11, wrap it around the bushing and push it axially to fit tightly against the second ring of packing 12. Figure 5 As shown, the joint of the cut of the third ring of packing 11 fits tightly and is offset from the cut of the second ring of packing 12 at a certain angle in the circumferential direction; the offset angle is at least 45 degrees, and in this embodiment, the offset angle is 90 degrees. Then, four positions P1, P2, P3, and P4 (e.g., ...) are selected in the circumferential direction on the surface of the third ring of packing 11 at intervals of 90 degrees. Figure 4 As shown), and measure the axial distance L3 from the four positions P1, P2, P3 and P4 to the end face of the stuffing box 4 near the stuffing gland 8 (as shown). Figure 5 As shown in the figure, if the difference between the measured four axial spacings L3 and the designed axial spacing does not exceed the design tolerance on the drawing, the subsequent steps can be carried out. If it exceeds the design tolerance on the drawing, it is necessary to adjust so that the difference between the actual measured four axial spacings L3 and the designed axial spacing does not exceed the design tolerance requirement on the drawing.

[0085] Step S60: After applying grease to the surface of the perforated ring 10, insert it axially and push it in until it is tightly fitted with the axial direction of the third ring of packing 11. Ensure that the opening on the perforated ring 10 is aligned with the external connection port 5 of the perforated ring to facilitate the addition of lubricant or the introduction of inert gas. Figure 5 As shown. Then, select four positions at 90-degree intervals along the circumference of the surface of the annular ring 10, and measure the axial distance L4 from each position to the end face of the stuffing box 4 near the stuffing gland 8 (e.g., ...). Figure 5As shown in the figure, if the difference between the measured four axial spacings L4 and the designed axial spacing does not exceed the design tolerance on the drawing, the subsequent steps can be carried out. If it exceeds the design tolerance on the drawing, it is necessary to adjust so that the difference between the actual measured four axial spacings L4 and the designed axial spacing does not exceed the design tolerance requirement on the drawing.

[0086] Step S70: After applying grease to the surface of the fourth ring of packing 9, wrap it around the bushing and push it axially to fit tightly against the bore ring 10. Figure 5 As shown, the joint of the cut of the fourth ring of packing 9 fits tightly and is offset from the cut of the third ring of packing 11 at a certain angle in the circumferential direction; the offset angle is at least 45 degrees, and in this embodiment, the offset angle is 90 degrees. Then, four positions P1, P2, P3, and P4 are selected in the circumferential direction on the surface of the fourth ring of packing 9, which are distributed at intervals of 90 degrees, and the axial distance L5 from the four positions P1, P2, P3, and P4 to the end face of the stuffing box 4 near the packing gland 8 is measured (e.g., ...). Figure 5 As shown in the figure, if the difference between the measured four axial spacings L5 and the designed axial spacing does not exceed the design tolerance on the drawing, the subsequent steps can be carried out. If it exceeds the design tolerance on the drawing, it is necessary to adjust so that the difference between the actual measured four axial spacings L3 and the designed axial spacing does not exceed the design tolerance requirement on the drawing.

[0087] Step S80: Tighten the packing gland 8 and stuffing box 4 evenly with fasteners (i.e., packing gland bolts 6 and packing gland nuts 7) to 20% of the preset target torque. Ensure radial alignment and uniform axial compression of the packing gland 8 during tightening. During tightening, measure the axial distance A between the stuffing box 4 and the packing gland 8, the radial distance B between the packing gland 8 and the stuffing box 4, and the radial distance C between the bushing 2 and the packing gland 8 (e.g., ...). Figure 6 As shown in the figure, each spacing is measured at four positions at 90-degree intervals along the circumference, and the difference between the measured value and the design value at the four positions of each spacing is controlled to be less than or equal to the design tolerance on the drawing.

[0088] Step S90: Tighten evenly to 100% of the preset target torque between the packing gland bolt 6 and the packing gland nut 7. During the tightening process, ensure that the radial centering and axial uniform pressing of the packing gland 8 are ensured. During the tightening process, measure the spacing A, spacing B and spacing C again, and control that the difference between the measured values ​​at the four positions of each spacing and the design values ​​on the drawing is less than or equal to the design tolerance on the drawing.

[0089] If leakage is found in the rotary seal assembly during operation of the PTA steam tube rotary dryer (the rotary seal assembly is located at the feed end seal of the PTA steam tube rotary dryer) with the aforementioned installed rotary seal assembly, the packing gland bolts 6 and packing gland nuts 7 can be further tightened. During tightening, the tightening torque and dimensions A, B, and C need to be checked. The tightening torque must not exceed the maximum value of the preset target torque found on the drawing.

[0090] The equipment installed in Example 1 was tested at a design pressure of 0.8 MPaG and a design temperature of 175°C. No leakage was observed during the factory cold pressure test, and no leakage occurred during one year of operation of the equipment.

[0091] Example 2

[0092] Example 2 is similar to Example 1, except that: in Example 2, there are 4 rings of packing on the right side of the perforated ring 10 (i.e., the first ring of packing 13, the second ring of packing 12, the third ring of packing 11, and the fourth ring of packing 9), and 2 rings of packing on the left side of the perforated ring 10 (i.e., the fifth ring of packing 14 and the sixth ring of packing 15). That is, the perforated ring 10 is located between the fourth ring of packing 9 and the fifth ring of packing 14, and is tightly fitted axially with both the fourth ring of packing 9 and the fifth ring of packing 14. Figure 7 As shown.

[0093] The equipment installed in Example 2 was tested at a design pressure of 1.3 MPaG and a design temperature of 219°C. No leakage was observed during the factory cold pressure test, and no leakage occurred during one year of operation of the equipment.

[0094] Example 3

[0095] This embodiment provides a method for installing a rotary sealing assembly for sealing the feed end of a rotary roasting furnace. The rotary sealing assembly includes a bushing, packing, stuffing box, stuffing gland, and fasteners, etc. The installed rotary sealing assembly is as follows: Figure 8 As shown. The specific installation method includes the following steps:

[0096] Step S10: Inspect all sealing components to be installed. Similar to Example 1, except that the bore ring is not inspected (i.e., step S1005 is omitted).

[0097] Step S20: Calculation and confirmation of fastener tightening torque. The tightening torque of fasteners (bolts, studs) should be calculated according to their specifications and design conditions or found in manuals and standards. At the same time, it should be confirmed whether the torque value is in a lubricated or unlubricated state. In this embodiment, it is found in a mechanical design manual.

[0098] Step S30: After applying grease to the outer surface of the first ring packing 13 (i.e., the first annular packing), wrap it around the bushing 2 and push it axially until it fits tightly against the bottom of the stuffing box 4, and the joint of the cut of the first ring packing 13 fits tightly; then select four positions P1, P2, P3 and P4 at 90-degree intervals along the circumferential direction of the surface of the first ring packing 13 (refer to...). Figure 4 (as shown), and measure the axial distance L1 from the four positions P1, P2, P3 and P4 to the end face of the stuffing box 4 near the stuffing gland (reference). Figure 3 As shown in the figure, if the difference between the measured four axial spacings L1 and the designed axial spacing does not exceed the design tolerance on the drawing, the subsequent steps can be carried out. If it exceeds the design tolerance on the drawing, it is necessary to adjust so that the difference between the actual measured four axial spacings L1 and the designed axial spacing does not exceed the design tolerance requirement on the drawing.

[0099] Step S40: After applying grease to the surface of the second ring of packing 12, wrap it around the bushing 2 and push it axially to fit tightly against the first ring of packing 13. The joint of the cut of the second ring of packing 12 fits tightly and is offset from the cut of the first ring of packing 13 at a certain angle in the circumferential direction; the offset angle is at least 45 degrees, and in this embodiment, the offset angle is 90 degrees. Then, four positions P1, P2, P3, and P4 (refer to...) are selected in the circumferential direction of the surface of the second ring of packing 12 at intervals of 90 degrees. Figure 4 (As shown), and measure the axial distance L2 from the four positions P1, P2, P3 and P4 to the end face of the stuffing box near the stuffing gland (reference). Figure 5 As shown in the figure, if the difference between the measured four axial spacings L2 and the designed axial spacing does not exceed the design tolerance on the drawing, the subsequent steps can be carried out. If it exceeds the design tolerance on the drawing, it is necessary to adjust so that the difference between the actual measured four axial spacings L2 and the designed axial spacing does not exceed the design tolerance requirement on the drawing.

[0100] Step S50: After applying grease to the surface of the third ring of packing 11, it is wrapped around the bushing 2 and pushed axially to fit tightly against the second ring of packing 12. The joint of the cut of the third ring of packing 11 fits tightly against the cut of the second ring of packing 12, and is offset from the cut of the second ring of packing 12 at a certain angle in the circumferential direction; the offset angle is at least 45 degrees, and in this embodiment, the offset angle is 90 degrees. Then, four positions P1, P2, P3, and P4 (refer to...) are selected in the circumferential direction of the surface of the third ring of packing 11 at intervals of 90 degrees. Figure 4 (As shown), and measure the axial distance L3 from the four positions P1, P2, P3 and P4 to the end face of the stuffing box near the stuffing gland (reference). Figure 5As shown in the figure, if the difference between the measured four axial spacings L3 and the designed axial spacing does not exceed the design tolerance on the drawing, the subsequent steps can be carried out. If it exceeds the design tolerance on the drawing, it is necessary to adjust so that the difference between the actual measured four axial spacings L3 and the designed axial spacing does not exceed the design tolerance requirement on the drawing.

[0101] Step S60: After applying grease to the surface of the fourth ring of packing 9, wrap it around the bushing 2 and push it axially to fit tightly against the axial direction of the third ring of packing 11. The joint of the cut of the fourth ring of packing 9 fits tightly and is offset from the cut of the third ring of packing at a certain angle in the circumferential direction; the offset angle is at least 45 degrees, and in this embodiment, the offset angle is 90 degrees. Then, four positions P1, P2, P3, and P4 (refer to...) are selected in the circumferential direction of the surface of the fourth ring of packing 9 at intervals of 90 degrees. Figure 4 As shown in the figure, the axial distances from four positions P1, P2, P3 and P4 to the end face of the stuffing box 4 near the stuffing gland are measured respectively. If the difference between the measured four axial distances and the designed axial distance does not exceed the design tolerance on the drawing, the subsequent steps can be carried out. If it exceeds the design tolerance on the drawing, it is necessary to adjust so that the difference between the actual measured four axial distances and the designed axial distance does not exceed the design tolerance requirement on the drawing.

[0102] Step S70: Tighten the packing gland 8 and stuffing box 4 evenly to 20% of the preset target torque using fasteners (i.e., packing gland bolts 6 and packing gland nuts 7). Ensure radial alignment and uniform axial compression of the packing gland 8 during tightening. During tightening, measure the axial distance A between the stuffing box 4 and the packing gland 8, the radial distance B between the packing gland and the stuffing box, and the radial distance C between the bushing and the packing gland (e.g., ...). Figure 6 As shown in the figure, each spacing is measured at four positions at 90-degree intervals along the circumference, and the difference between the measured value and the design value at the four positions of each spacing is controlled to be less than or equal to the design tolerance on the drawing.

[0103] Step S80: Tighten evenly to 100% of the preset target torque between the packing gland bolt 6 and the packing gland nut 7. During the tightening process, ensure that the radial centering of the gland is achieved and that the axial clamping is uniform. During the tightening process, measure the spacing A, spacing B and spacing C again, and control that the difference between the measured values ​​at the four positions of each spacing and the design values ​​on the drawing is less than or equal to the design tolerance on the drawing.

[0104] If leakage is found in the rotary roasting furnace (where the rotary sealing assembly is located at the feed end seal) with the aforementioned installed rotary sealing assembly during operation, the packing gland bolts and packing gland nuts can be further tightened. During tightening, the tightening torque and dimensions A, B, and C must be checked. The tightening torque must not exceed the maximum preset target torque value found on the drawing.

[0105] The installed equipment is designed for a pressure of -0.0002 MPaG and a temperature of 300℃. The sealing structure is used to seal between the furnace chamber and the furnace cylinder, allowing for a small amount of leakage into the furnace chamber.

[0106] Comparative Example 1

[0107] Comparative Example 1 is similar to Example 1, except that: workers cut the packing according to the theoretical length of the drawings, often using an angle grinder; during routine installation, the tightening torque is not calculated or confirmed, and workers tighten and adjust based on experience; to facilitate installation, workers often use hammers or other tools to flatten the packing, causing fiber damage; to save installation time, workers often push several rings of packing onto the sealing surface together into the stuffing box; the depth dimension of the stuffing box (i.e., L0) is not checked before the first ring of packing is installed, and the remaining axial length (i.e., L1, L2, ...) is not checked after each ring is installed; dimensions A, B, and C are not checked during the packing installation process; there is no clear tightening torque requirement during the packing gland tightening process, and the number of turns of the corresponding bolts are adjusted only according to whether the deviation of dimension A on the circumference is uniform.

[0108] Using an angle grinder for cutting can cause fiber deformation or warping at the cut edge; cutting too long can lead to interference and warping of the cut edge, while cutting too short can result in the cut edges not contacting and aligning, both of which can cause excessive gaps between the packing and bushing surfaces; failure to check the depth dimension L0 of the stuffing box, and the presence of debris at the bottom, can cause poor packing fit; installing several rings of packing together can lead to loose fit between the packing rings; during the tightening process, only checking the uniformity of axial compression (A value) while neglecting to check the radial clearance requirements (B and C values) can easily lead to wear on the packing gland and bushing (due to insufficient clearance). Poor fit between packing rings during conventional installation and poor installation accuracy can easily lead to leakage.

[0109] To keep the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0110] The embodiments described above merely illustrate several implementations of the present invention and should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A method for installing a rotary sealing assembly, characterized in that, Includes the following steps: S1: Inspect all components in the sealing assembly to be installed; S2: The first annular packing is wound around the bushing and pushed in axially to fit tightly against the bottom of the stuffing box; then, four positions are selected at 90-degree intervals along the circumferential direction of the surface of the first annular packing, and the axial distance from each position to the end face of the stuffing box near the packing gland is measured respectively, and the difference between the four measured axial distances and the design value is controlled to be less than or equal to the design tolerance. S3: The second annular packing is wound around the bushing and pushed in axially to fit tightly against the first annular packing; then, four positions are selected at 90-degree intervals along the circumferential direction of the surface of the second annular packing, and the axial distance from each position to the end face of the stuffing box near the stuffing gland is measured. The error between the measured value and the design value of the four axial distances is controlled to be less than or equal to the design tolerance. S4: Following the installation and measurement control method in step S3, install the remaining annular packing in sequence; S5: Tighten the packing gland and the stuffing box uniformly with fasteners to 15%-30% of the preset target torque of the fasteners, ensuring radial alignment and uniform axial compression of the packing gland. Measure the axial distance A between the fasteners and the stuffing box and the packing gland, the radial distance B between the packing gland and the stuffing box, and the radial distance C between the bushing and the packing gland. Each distance is measured at four positions at 90-degree intervals along the circumferential direction. Control that the error between the measured value and the design value at each of the four positions of each distance is less than or equal to the design tolerance. S6: Tighten the fasteners uniformly to 100% of the preset target torque, measure the spacing A, spacing B and spacing C again, and control the error between the measured value and the design value at the four positions of each spacing to be less than or equal to the design tolerance. The joints of the cuts in each annular packing are all tightly fitted.

2. The installation method of the rotary sealing assembly as described in claim 1, characterized in that, The cut joints of each of the annular packings are staggered along the circumferential direction.

3. The installation method of the rotary sealing assembly as described in claim 2, characterized in that, The cut joint of each of the annular packings has an offset angle in the circumferential direction; preferably, the offset angle is at least 45 degrees.

4. The installation method of the rotary sealing assembly as described in claim 3, characterized in that, The offset angle of the cut joint of each of the annular packings in the circumferential direction is 90 degrees.

5. The installation method of the rotary sealing assembly as described in claim 1, characterized in that, The cuts of each of the annular packings are independently selected from flush cuts or bevel cuts.

6. The installation method of the rotary sealing assembly as described in claim 1, characterized in that, It also includes the step of installing a perforated ring between the second annular packing and the last annular packing; The hole is placed around the bushing and pushed in axially to fit tightly against the corresponding annular packing. Then, four positions are selected at 90-degree intervals on the circumferential direction of the hole ring surface. The axial distance from each position to the end face of the stuffing box near the packing gland is measured. The error between the measured value and the design value of the four axial distances is controlled to be less than or equal to the design tolerance. Furthermore, the opening on the perforated ring is aligned with the external connection port of the perforated ring.

7. The installation method of the rotary sealing assembly as described in claim 6, characterized in that, After applying grease to the surface of the annular ring, proceed with the installation.

8. The installation method of the rotary sealing assembly as described in claim 1, characterized in that, After applying grease to the surface of each of the ring-shaped packings, the packings are then installed.

9. The installation method of the rotary sealing assembly as described in claim 1, characterized in that, Fasteners used to secure the packing gland to the stuffing box include bolts on the connecting flange of the stuffing box.

10. A rotary sealing assembly, characterized in that, The rotary sealing assembly is installed using the installation method of the rotary sealing assembly according to any one of claims 1-9.

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