A type of split-type stuffing box

Abstract

This utility model provides a segmented stuffing box, comprising an integrally formed stuffing shell and a connecting flange. The stuffing shell has a segmented structure, and the connecting flange has radial set screw seats along its circumference. Each set screw seat is equipped with a radial set screw, and a limiting device is provided between two set screw seats. The limiting device includes a limiting block fixed on a base and a wedge-shaped block embedded between the limiting block and the outer circumference of the connecting flange. The segmented structure minimizes the disassembly of other components during the replacement of the stuffing and retaining ring. Simultaneously, the set screws along the circumference of the connecting flange facilitate adjustment of the clearance between the shaft and the stuffing box by operators. The clearance can be quickly adjusted simply by turning the set screws without requiring numerous tools. Furthermore, the wedge-shaped limiting block effectively restricts the radial displacement of the stuffing box, ensuring the stability of the clearance value.

Description

Technical Field

[0001] This utility model relates to the field of packing seals, specifically to a segmented packing gland. Background Technology

[0002] As one of the oldest and most widely used forms of dynamic seals, packing seals play a crucial sealing role between rotating or reciprocating shafts (rods) and stationary housings, and remain an indispensable component of fluid machinery (such as valves, agitators, and compressors). Due to their simple structure, reliability, low cost, strong adaptability, and ease of maintenance, packing seals still hold an important position in the industrial field, especially in applications where minute leakage is permissible, cost is sensitive, or operating conditions are complex.

[0003] However, packing seals not only have the inherent characteristic of controllable leakage, but also involve high frictional power consumption and the risk of shaft damage. Furthermore, uneven clearance between the stuffing box and the rotating shaft is prone to occur, thus placing higher demands on their maintenance and installation. In actual operation, the clearance between the stuffing box and the shaft is a key parameter affecting the performance of the packing seal: due to long-term wear and compression, this clearance gradually becomes uneven, leading to leakage problems. At this point, it is necessary to readjust the clearance and replace the packing to restore the sealing effect.

[0004] Therefore, replacing the packing, readjusting the clearance with the shaft, and replacing the retaining ring have become unavoidable tasks during maintenance; and these operations are carried out in a confined space, which brings considerable difficulty to the maintenance personnel. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a segmented stuffing box, which allows for convenient disassembly of the inner retaining ring, removal of the old stuffing, readjustment of the gap between the stuffing box and the shaft, and repositioning of the stuffing box after gap adjustment without disassembling transmission components such as bearings and bearing seats when replacing the stuffing.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A segmented stuffing box includes an integrally formed stuffing shell and a connecting flange. The stuffing shell extends axially through the connecting flange, and the first end of the stuffing shell is flush with the first end face of the connecting flange. The second end of the stuffing shell extends axially outward from the second end face of the connecting flange to form a protrusion.

[0008] The first end face of the connecting flange contacts and is fixed to the base; and the connecting flange is provided with a plurality of radial set screw seats in the circumferential direction, each set screw seat is equipped with a radial set screw, the inner end of the set screw abuts against the outer wall of the packing cylinder, for adjusting and locking the clearance of the packing cylinder relative to the shaft; a limiting device is provided between two adjacent set screw seats, the limiting device including a limiting block fixed to the base, and a wedge block embedded between the limiting block and the outer circumferential side of the connecting flange, for cooperating with the set screw to achieve radial fixation of the packing cylinder;

[0009] The packing cylinder is radially divided into N segments, each segment being detachably and fixedly connected, and the set screw seat and the limiting device both avoid the connection points between the segments.

[0010] This utility model provides a segmented stuffing box, comprising a circular stuffing cylinder and a connecting flange. The circular stuffing cylinder has a segmented structure, allowing for easy disassembly of the stuffing and retaining rings without disassembling transmission and support components (such as motors, reducers, couplings, bearings, bearing housings, etc.), facilitating the replacement of new stuffing and retaining rings. The stuffing box is initially fixed to the integral base via connecting parts. The connecting flange has set screw seats arranged circumferentially, each equipped with a set screw (for applying adjustment force). A gap is provided between the set screw seats and the set screws on the connecting flange—this gap provides space for fine-tuning the position of the stuffing cylinder. The fit clearance between the circular stuffing cylinder and the internal shaft can be easily adjusted by rotating the set screws. A limiting device is provided between two adjacent set screw seats. A wedge block is embedded between the limiting block in the limiting device and the connecting flange. After the clearance is properly adjusted, the embedded wedge block provides radial positioning, preventing the stuffing box from shifting due to vibration or other reasons, thus preventing damage to the adjusted clearance and achieving self-aligning positioning. The joints between the segmented packing cylinders can be sealed using industry-standard methods. For example, the joints between the segmented packing cylinders can be sealed by applying sealant, or by polishing the joints to improve machining accuracy and combining the packing and / or baffle rings to achieve a seal, thereby preventing leakage from the joints between the segments.

[0011] In one alternative implementation, N is 2.

[0012] In one alternative embodiment, the two segments are fixedly connected by four pairs of screws, and the four pairs of screws are symmetrically distributed in pairs along the central surface of the packing cylinder.

[0013] In one optional embodiment, one lobe is provided with a bolt through hole, the center line of which is perpendicular to the mating surface between the two lobes; the other lobe is provided with a threaded hole that corresponds to and mates with the bolt through hole.

[0014] In one alternative implementation, there are two wedges.

[0015] In one optional embodiment, the two wedge blocks are arranged with their inclined surfaces facing each other and are jointly embedded between the limiting block and the outer peripheral surface of the connecting flange. For example, a first wedge block and a second wedge block are provided between the limiting block and the connecting flange. Both the first and second wedge blocks have right-angled triangular cross-sections and their inclined surfaces face each other. The right-angled side of the first wedge block is fitted against the inner wall of the limiting block, and the right-angled side of the second wedge block is fitted against the inner wall of the connecting flange. When the connecting flange is pressed towards the limiting block, the first and second wedge blocks, under the action of their inclined surfaces, are respectively pressed tightly against the limiting block and the connecting flange, achieving a locking mechanism.

[0016] In one alternative embodiment, the wedge block has a right-angled triangular cross-sectional shape.

[0017] In one alternative embodiment, each of the set screw seats is welded and fixed to the base.

[0018] In one alternative embodiment, the first end of the packing cylinder is fixed to the base by a connector (such as a stud, bolt, screw, etc.).

[0019] In one alternative implementation, the base is welded to the device body.

[0020] This utility model provides a split-type stuffing box, including a stuffing shell and a connecting flange. The stuffing shell has a split structure, specifically composed of multiple segments (preferably two segments) assembled into a single unit by connecting parts. Set screws and limiting blocks are arranged on the circumference of the connecting flange. This split structure minimizes the disassembly of other components during packing and retaining ring replacement. Specifically, the packing and retaining ring (easily worn parts) can be easily removed and quickly replaced without disassembling any shaft-related transmission components (such as motors, reducers, couplings, bearings, bearing housings, etc.), significantly reducing maintenance time and improving work efficiency. Simultaneously, the set screws on the circumference of the connecting flange facilitate adjustment of the clearance between the shaft and the stuffing shell. The clearance can be quickly adjusted simply by turning the set screws, requiring minimal tools. Furthermore, the wedge-shaped block between the limiting block and the outer circumferential side of the connecting flange effectively restricts the radial displacement of the stuffing box, ensuring the stability of the clearance value and thus reducing maintenance frequency.

[0021] For fixation or connection not described in detail above, standard industry methods can be used, and will not be elaborated further. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the segmented stuffing box provided by this utility model.

[0024] Among them, 1, packing gland; 2, semi-packing cylinder I; 3, stud; 4, nut; 5, limit block; 6, wedge block; 7, set screw; 8, set screw seat; 9, base; 10, connecting flange; 11, split screw; 12, semi-packing cylinder II. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "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 utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 utility model based on the specific circumstances.

[0029] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0030] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0031] like Figure 1 As shown, the split-type stuffing box includes a stuffing shell and a connecting flange 10, and the stuffing shell passes through the connecting flange 10 axially. The first end of the stuffing shell is flush with the first end face of the connecting flange 10, and the second end of the stuffing shell extends outward from the second end face of the connecting flange 10 axially to form a protrusion.

[0032] The packing cylinder is composed of a semi-packing cylinder I 2 and a semi-packing cylinder II 12, which are fastened together by split screws 11 to form a single integrated packing cylinder. The packing cylinder and the connecting flange 10 are integrally formed and are fixed to the base 9 by studs 3 and nuts 4 on the connecting flange 10.

[0033] The second end of the stuffing box is sealed by a stuffing gland 1 to compress the stuffing. Four set screw seats 8 are evenly distributed around the circumference of the connecting flange 10. Set screws 7 are connected to the set screw seats 8. The radial displacement of the stuffing box can be adjusted by the set screws, thereby adjusting the gap between the stuffing box and the shaft and ensuring the uniformity of the gap. There is a set of limiting devices between the two set screw seats. The limiting devices include a limiting block 5 (the limiting block 5 is welded to the base 9) and two wedge blocks 6. The two wedge blocks 6 are mainly used to fix the stuffing box radially by embedding them into each other after the gap is adjusted by the set screws 7. This prevents the stuffing box from deviating due to squeezing or other forces during operation, which would affect the gap. In the specific implementation process, the packing gland 1 is first removed, and then the two half-packing cylinders 2 and 12 are disassembled. The damaged old packing or retaining ring is removed. Since the stuffing box has a split structure, it is not necessary to remove the bearings, motors and other transmission components, which greatly simplifies the installation and disassembly steps. When reassembling, the two half-packing cylinders 2 and 12 are fastened together with split screws 11. The gap between the stuffing box and the shaft is adjusted by the set screw 7. Then, two wedge blocks 6 are embedded between the connecting flange 10 and the limiting block 5 to ensure that the stuffing box does not shift in the radial direction and to ensure the stability of the gap value between the stuffing box and the shaft, thereby greatly reducing the risk of leakage and achieving good benefits.

Claims

1. A segmented stuffing box, characterized in that, It includes an integrally formed packing cylinder and a connecting flange. The packing cylinder extends through the connecting flange axially, and the first end of the packing cylinder is flush with the first end face of the connecting flange. The second end of the packing cylinder extends outward from the second end face of the connecting flange axially to form a protrusion. The first end face of the connecting flange contacts and is fixed to the base; and the circumference of the connecting flange is provided with a plurality of radial set screw seats, each set screw seat is equipped with a radial set screw, the inner end of the set screw abuts against the outer wall of the packing cylinder, for adjusting and locking the clearance of the packing cylinder relative to the shaft; a limiting device is provided between two adjacent set screw seats, the limiting device including a limiting block fixed to the base, and a wedge block embedded between the limiting block and the outer circumference of the connecting flange, for cooperating with the set screw to achieve radial fixation of the packing cylinder; The packing cylinder is radially divided into N segments, each segment being detachably and fixedly connected, and the set screw seat and the limiting device both avoid the connection points between the segments.

2. The segmented stuffing box as described in claim 1, characterized in that, N is 2.

3. The segmented stuffing box as described in claim 2, characterized in that, The two segments are fixedly connected by four pairs of screws, and the four pairs of screws are symmetrically distributed in pairs along the center plane of the packing cylinder.

4. The segmented stuffing box as described in claim 3, characterized in that, in, One lobe has a bolt through hole, the center line of which is perpendicular to the mating surface between the two lobes; the other lobe has a threaded hole that corresponds to and mates with the bolt through hole.

5. The segmented stuffing box as described in claim 1, characterized in that, There are two wedge-shaped blocks.

6. The segmented stuffing box as described in claim 5, characterized in that, The two wedge-shaped blocks are arranged with their inclined surfaces facing each other and are jointly embedded between the limiting block and the outer peripheral side of the connecting flange.

7. The segmented stuffing box as described in claim 1, characterized in that, Each of the aforementioned set screw seats is welded and fixed to the base.

8. The segmented stuffing box as described in claim 1, characterized in that, The first end of the packing cylinder is fixed to the base by a connector.

9. The segmented stuffing box as described in claim 8, characterized in that, The base is welded to the equipment body.

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