A slurry pump packing gland, packing box assembly and slurry pump

Abstract

The utility model discloses a kind of packing gland of slurry pump, include: packing gland main body and locking bolt assembly;Wherein, the packing gland main body includes two identical packing gland mechanism;Two the packing gland mechanism is fastened by the locking bolt assembly, and an integral annulus is formed;The inner thread is equipped in the annular inside.This utility model discloses a novel packing gland structure, the utility model has simple structure, easy to operate, safe, strong reliability, and will not cause packing damage and other advantages, especially after packing is used for a period of time, the volume becomes smaller after extrusion, shaft seal effect starts to be poor, shaft seal leakage water volume is too large, packing gland needs to be tightened to extrude packing, control leakage water volume and shaft seal effect, and the leaked shaft seal water can be discharged through 8 evenly distributed circular through holes.

Description

Technical Field

[0001] This utility model relates to the field of slurry pump technology, specifically to a packing gland and packing box assembly for a slurry pump. Background Technology

[0002] Slurry pumps are commonly used equipment in mineral processing production lines to lift slurry to a certain height, thereby improving the operating efficiency of subsequent equipment. However, since slurry pumps are essentially centrifugal pumps, the clearance between the pump chamber and the centrifugal shaft inevitably leads to slurry overflowing from the pump chamber.

[0003] To prevent slurry overflow, the centrifugal shaft of the slurry pump needs to be sealed. Currently, packing seals based on stuffing boxes are the most widely used, reliable, and economical shaft sealing method. Specifically, the stuffing gland of the slurry pump includes a matching stuffing box. The stuffing box is fixed to the pump cover, the shaft sleeve is fitted onto the centrifugal shaft, and the space between the shaft sleeve and the packing is filled with several rings of packing. The stuffing gland presses against the unused surface of the outermost packing. High-pressure clean water enters the front water seal ring through the channel on the stuffing box. Part of the water enters the pump chamber, and the other part leaks to the outside through the packing (rotating the packing and carrying away the heat generated by the friction difference between the shaft sleeve and the packing), thus preventing the slurry inside the pump from leaking out.

[0004] During daily operation, after a period of time, the leakage of shaft seal water often increases due to factors such as packing wear (the shaft sleeve rotates with the pump shaft, the packing remains stationary with the stuffing box, and the packing rubs against the shaft sleeve) and packing extrusion deformation. It is necessary to periodically tighten the packing gland bolts to control the leakage and ensure the packing seal is in normal working condition, thus ensuring the sealing effect on the pump cavity. However, existing technologies present several problems when replacing packing. Firstly, because the packing gland is connected to the stuffing box by four sets of bolts, tightening the bolts often requires the pump to be kept running, and the limited operating space makes the process very dangerous. There is a risk of being caught in the high-speed rotating pump shaft during the tightening process (bolts evenly distributed in four directions). Secondly, when tightening the four packing gland bolts, the packing gland often tilts due to inconsistent tightening distances, causing the shaft sleeve to come into contact with the packing gland, resulting in wear and uneven packing extrusion, leading to poor shaft seal sealing or packing damage. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a novel packing gland structure, which has the advantages of simple structure, convenient operation, safety, high reliability, and no damage to the packing. It improves the safety issues during the tightening process of the packing gland in slurry pump operation, and addresses the technical problem that tilting during tightening can easily damage the packing and reduce the sealing effect.

[0006] To address the shortcomings of the aforementioned technologies, this utility model proposes the following technical solution:

[0007] A slurry pump packing gland includes: a packing gland body and a locking bolt assembly; wherein, the packing gland body includes two packing gland mechanisms; the two packing gland mechanisms are fastened together by the locking bolt assembly to form a complete ring; the inner side of the ring is provided with internal threads.

[0008] In this utility model, the packing gland mechanism includes: a main body; a threaded portion and a clamping portion extending from the same side of the main body; the threaded portion is used to engage with the external thread on the packing box; and the clamping portion is used to clamp the packing.

[0009] Preferably, the threaded portion is 50 mm long; the clamping portion is 30 mm long; and the threaded portion and the clamping portion are spaced 20 mm apart.

[0010] Preferably, the main body of the mechanism is provided with an inner chamfer.

[0011] In this invention, the packing gland body is provided with a through hole.

[0012] Preferably, the diameter of the through hole is 12 mm.

[0013] Preferably, the packing gland body is made of carbon steel or stainless steel.

[0014] The present invention also proposes a slurry pump stuffing box assembly, comprising: a slurry pump stuffing gland, a bushing, stuffing, a water seal ring, and a stuffing box; wherein the stuffing box is provided with an external thread that mates with the internal thread.

[0015] In this invention, the end face of the packing gland that presses the packing is always perpendicular to the bushing.

[0016] The present invention also proposes a slurry pump, comprising: the slurry pump stuffing box assembly proposed in this utility model.

[0017] The packing gland of this utility model has the following beneficial effects:

[0018] This utility model discloses a novel packing gland structure, which has advantages such as simple structure, convenient operation, safety, high reliability, and no damage to the packing. Especially after the packing has been used for a period of time, its volume decreases due to compression, the shaft seal effect begins to deteriorate, and the leakage of shaft seal water becomes excessive. It is necessary to tighten the packing gland to compress the packing, control the leakage water and shaft seal effect, and the leaked shaft seal water can be discharged through eight evenly distributed circular holes. This structure can always keep the contact end face between the packing gland and the packing perpendicular to the axial direction, preventing tilting and avoiding wear of the packing gland on the shaft sleeve due to tilting, and preventing the packing from being damaged by tilting compression. At the same time, the operating space is increased during the tightening of the packing gland, making it safer. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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 from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the packing gland for the slurry pump of this utility model.

[0021] Figure 2 This is an exploded view of the packing box assembly of this utility model.

[0022] Figure 3 This is an assembly diagram of the stuffing box assembly of this utility model.

[0023] Figure 4 This is a cross-sectional view of the filling box assembly of this utility model after assembly.

[0024] Figure 5 , Figure 6 This is a schematic diagram of the structure of the packing gland for the slurry pump of this utility model. Detailed Implementation

[0025] The utility model will be further described in detail below with reference to the specific embodiments and accompanying drawings. Except for the contents specifically mentioned below, the processes, conditions, and experimental methods for implementing this utility model are all common knowledge and general knowledge in the field, and this utility model has no particular limitations.

[0026] Figures 1-6 In the middle, 1-packing gland body, 11-through hole; 12-packing gland mechanism; 121-mechanism body; 122-threaded part; 123-clamping part; 124-inner chamfer; 13-internal thread; 2-locking bolt assembly; 3-shaft sleeve; 4-packing; 5-water seal ring; 6-packing box; 61-external thread.

[0027] This utility model discloses a novel structure for a slurry pump packing gland, belonging to the field of slurry pump technology. It includes a packing gland body 1, a locking bolt assembly 2, and a packing box used with the packing gland. The packing gland body 1 comprises two packing gland mechanisms 12 fastened together by two sets of locking bolt assemblies, forming a complete ring. The inner side of the ring has internal threads, and the packing box used with this novel structure has external threads; the two are connected together by a threaded structure. The packing box is made of ordinary carbon steel or stainless steel. During normal assembly, the packing seal structure connects the packing gland mechanisms 12 to form a complete ring via the bolt assembly. The packing gland is then tightened onto the packing box by screwing on the threads. During tightening, the packing gland gradually presses against the packing in the packing box, ensuring the packing seal is in normal working condition. After prolonged use, the packing material may become deformed due to compression. Once the packing gland is fully screwed on, it can be unscrewed, the packing gland bolts loosened, the packing gland body removed, and a new packing material replaced. The packing gland can then be reinstalled for continued use. This invention has the advantages of simple structure, convenient operation, safety, high reliability, and no damage to the packing material.

[0028] This utility model relates to a packing gland. The packing gland consists of two semi-circular main bodies connected by bolts to form a complete ring. The inner ring of the packing gland has internal threads. The matching packing box has external threads. In normal use, after filling the packing box, the packing gland is tightened.

[0029] Example

[0030] The slurry pump stuffing box assembly in this embodiment includes: a slurry pump stuffing gland, a bushing, stuffing, a water seal ring, and a stuffing box.

[0031] The packing gland includes a packing gland body and a locking bolt assembly. The body is made of ordinary carbon steel or stainless steel. The packing gland has one internal thread, while the packing box used with it has one external thread, and the two are connected by threads.

[0032] The packing gland and the stuffing box are connected by threads, ensuring that the end face of the packing gland pressing the packing remains perpendicular to the shaft during the tightening process. This prevents the packing gland from tilting during the tightening process, avoids the packing gland hitting the rotating shaft sleeve and causing wear, and prevents the packing from being damaged due to uneven compression or affecting the sealing effect of the shaft seal.

[0033] When the slurry is running, if you need to tighten the packing gland slightly (because the shaft seal water leakage is too large, the packing gland needs to be tightened slightly), you can insert a round steel bar (8-10mm in diameter) into the eight evenly distributed through holes (12mm in diameter) on the packing gland and rotate the steel bar. This operation is both safe (avoiding being too close to the selected pump shaft, as current technology does not have a protective cover here) and labor-saving.

[0034] When installing the shaft seal, install the front water seal ring and packing into the stuffing box, install the shaft sleeve onto the pump shaft, install the stuffing box, and then assemble the packing gland body into a ring, screwing it onto the stuffing box for use. During the operation of the slurry pump, simply tighten the packing gland periodically with a tool. When the packing gland is fully tightened, it indicates that new packing needs to be replaced. At this time, remove the packing gland, take out the old packing, and replace it.

[0035] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0036] As used in this invention, the term "comprising" is an open-ended expression, meaning it includes the contents specified in this invention, but does not exclude other aspects.

[0037] As used in this invention, the term "and / or" includes any one and all combinations of one or more of the related listed items.

[0038] The scope of protection of this utility model is not limited to the above embodiments. Any variations and advantages that can be conceived by those skilled in the art without departing from the spirit and scope of the utility model are included in this utility model and are protected by the appended claims.

Claims

1. A slurry pump packing gland characterized by, include: The packing gland body (1) and the locking bolt assembly (2); wherein, The packing gland body (1) includes two packing gland mechanisms (12). The two packing gland mechanisms (12) are fastened together by the locking bolt assembly (2) to form a complete ring; The inner side of the ring is provided with an internal thread (13).

2. The slurry pump packing gland of claim 1, wherein, The packing gland body (1) is provided with a through hole (11).

3. The slurry pump packing gland of claim 2, wherein, The diameter of the through hole (11) is 12 mm.

4. The slurry pump packing gland of claim 1, wherein, The packing gland body (1) is made of carbon steel or stainless steel.

5. The slurry pump packing gland of claim 1, wherein, The packing gland mechanism (12) includes: a mechanism body (121); a threaded portion (122) and a clamping portion (123) extend from the same side of the mechanism body (121); The threaded portion (122) is used to mate with the external thread on the stuffing box; The clamping part (123) is used to clamp the packing.

6. The slurry pump packing gland of claim 5, wherein, The threaded part (122) is 50 mm long; the clamping part (123) is 30 mm long; and there is a 20 mm gap between the threaded part (122) and the clamping part (123).

7. The slurry pump packing gland of claim 5, wherein, The main body of the mechanism (121) is provided with an inner chamfer (124).

8. A stuffing box assembly for a slurry pump, characterized in that, include: The slurry pump packing gland, bushing (3), packing (4), water seal ring (5), and stuffing box (6) as described in any one of claims 1-7; wherein, The stuffing box (6) is provided with an external thread (61) that mates with the internal thread (13).

9. The slurry pump stuffing box assembly of claim 8, wherein, The end face of the packing gland that presses the packing (4) is always perpendicular to the bushing (3).

10. A slurry pump characterized by, include: The slurry pump stuffing box assembly as described in claim 8 or 9.

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