Sealing device for tin smoke dust conveying equipment

Abstract

The utility model relates to a sealing device for tin smoke dust conveying equipment, which comprises a packing chamber, packing arranged in the packing chamber, a gland connected with the packing chamber and a rotating shaft penetrating through the packing chamber, the packing comprises at least two groups of packing layers, an oil storage ring is arranged between the two groups of packing layers, and an oil storage part is arranged on the outer wall of the packing chamber; the outer diameter of the oil storage ring is smaller than the inner diameter of the filler chamber, a lubricant circulation gap is formed, the inner diameter of the oil storage ring is larger than the outer diameter of the rotating shaft, and a non-contact fit gap is formed. An annular oil storage groove and a radial oil guide hole communicated with the oil storage groove are formed in the oil storage ring; the oil storage part is connected with the filler chamber, and an oil outlet hole of the oil storage part corresponds to the radial oil guide hole in position and forms a continuous oil way channel. The problem of abrasion caused by penetration and viscous agglomeration of superfine particles is solved, and the continuous operation period of equipment is prolonged; the maintenance cost is reduced, the filler replacement frequency is reduced, the manual intervention frequency is reduced, and the tin processing cost per ton is reduced; shaft power loss is reduced, and equipment energy efficiency is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the technical field of dust conveying equipment in crude tin smelting systems, and more specifically to a sealing device for dust conveying equipment for tin smelting. Background Technology

[0002] In tin smelting and recycling processes, the dynamic sealing technology of fume conveying equipment faces severe challenges. Tin fumes are mainly composed of ultrafine particles (primarily SnO2, SnS, and trace amounts of volatile metal compounds such as As, Pb, Zn, and Ce). Their unique physicochemical properties lead to the following systemic defects in traditional packing seals:

[0003] 1. Ultrafine particle penetration problem: The median particle size of tin fume dust is 1-5μm, which is much smaller than that of conventional industrial dust, while the interlayer gap of traditional packing seals is generally greater than 10μm. Particles can easily penetrate the packing layer, forming a vicious cycle of "leakage-accumulation-wear"; leaked particles accumulate on the sealing surface, causing abnormal wear between the packing and the rotating shaft; wear further widens the gap, exacerbating particle penetration and leading to a continuous increase in leakage rate (>500mL / h).

[0004] 2. Frictional failure caused by particle adhesion: SnO2 particles have high surface activity and easily adsorb environmental moisture to form sticky agglomerates. The adhering substances significantly increase the friction coefficient between the packing and the rotating shaft, accelerating the wear of the sealing surface. The frictional heat and high temperature conditions (≤300℃) combined cause the packing to harden and lose its elasticity, requiring frequent manual tightening and adjustment.

[0005] Furthermore, manual operation presents two major contradictions: when the clamping force is too large, the shaft power loss can reach 4-6kW (accounting for 8%-12% of the total energy consumption); when the clamping force is insufficient, the seal fails and the leakage rate exceeds the standard.

[0006] 3. Limitations of existing solutions: Currently, the common approach to address leakage issues is to "replace packing frequently" (cycle < 10 days) or "adjust packing tightness frequently" (shaft loss > 5%). However, this leads to a surge in maintenance costs. Frequent downtime for packing replacement consumes a lot of manpower and resources, significantly increasing the cost per ton of tin processing. Energy efficiency is low, and high shaft power loss and manual intervention further reduce the economic efficiency of the equipment. Environmental risks exist, as leaked fumes cause on-site pollution and pose compliance risks for fugitive emissions.

[0007] The aforementioned technical bottlenecks indicate that traditional sealing structures can no longer meet the comprehensive requirements of long-term sealing, low energy consumption, and easy maintenance in tin fume conveying operations.

[0008] Therefore, there is an urgent need for an innovative sealing device that can fundamentally block the penetration of ultrafine particles, reduce frictional loss, and achieve autonomous compensation of sealing performance. Utility Model Content

[0009] Therefore, the purpose of this utility model is to propose a sealing device for tin fume conveying equipment, which fundamentally blocks the penetration of ultrafine particles, reduces frictional loss, and achieves autonomous compensation of sealing performance.

[0010] The technical solution of this utility model is a sealing device for a tin fume conveying equipment, including a packing chamber, packing disposed in the packing chamber, a pressure cover connected to the packing chamber, and a rotating shaft penetrating the packing chamber. The packing consists of at least two packing layers, with an oil storage ring disposed between the two packing layers. An oil storage part is installed on the outer wall of the packing chamber. The outer diameter of the oil storage ring is 0.1-0.2 mm smaller than the inner diameter of the packing chamber, forming a lubricant flow gap. Its inner diameter is 0.3-0.6 mm larger than the outer diameter of the rotating shaft, forming a non-contact fitting gap. The oil storage ring is provided with a circumferential oil storage groove and a radial oil guide hole communicating with the oil storage groove. The oil storage part is connected to the packing chamber, and its oil outlet corresponds to the radial oil guide hole, forming a continuous oil passage.

[0011] According to the sealing device of this utility model, the oil storage part is an oil cup, and the packing chamber is provided with a connection hole on the outlet of the oil cup.

[0012] According to the sealing device of this utility model, the bottom of the oil cup is provided with a threaded interface, which is connected to the connecting hole by a thread.

[0013] According to the sealing device of this utility model, the diameter of the radial oil guide hole is 1-3mm, and 4-6 sets are evenly distributed along the radial direction of the oil storage ring.

[0014] According to the sealing device of this utility model, the axial thickness of the oil storage ring is 1.2-1.5 times the thickness of a single layer of the packing layer.

[0015] According to the sealing device of this utility model, the oil storage ring is made of 316L stainless steel or Hastelloy, and the surface roughness Ra≤0.8μm.

[0016] According to the sealing device of this utility model, a temporary oil storage area is provided on both sides of the oil storage ring along the axial direction and inside the sealing side of the two sets of packing layers.

[0017] According to the sealing device of this utility model, the oil storage ring is an integral structure or a split structure.

[0018] As can be seen from the above technical solution, compared with the prior art, this utility model effectively solves the sealing problem in the transportation of tin fumes by means of the synergistic effect of multi-layer packing and oil storage ring, combined with the oil supply system of the oil storage section. The specific technical effects are as follows:

[0019] 1. Dynamic oil film seal: The lubricant flow gap (outer diameter small 0.1-0.2mm) of the oil reservoir ring and the non-contact fit gap (inner diameter large 0.3-0.6mm) form a lubricant distribution channel. With the help of radial oil guide holes, the lubricant is evenly delivered to the packing gap, forming a 0.2-0.5mm continuous oil film on the rotating shaft surface. This physically blocks the penetration of 1-5μm ultrafine particles, reducing the leakage rate from >500mL / h of traditional seals to <50mL / h.

[0020] 2. Optimized friction loss: The non-contact gap design avoids rigid friction between the oil reservoir ring and the shaft. Combined with the oil film lubrication, the shaft power loss is reduced from 4-6kW to ≤1.5kW, reducing energy consumption by more than 60%.

[0021] 3. Long-lasting self-compensating seal: The axial thickness of the oil reservoir ring is 1.2-1.5 times that of the packing layer to ensure sufficient oil storage; the temporary oil reservoir continuously releases grease at high temperatures to compensate for the thermal expansion deformation of the packing, extending the maintenance cycle from <10 days to ≥90 days.

[0022] 4. Quick maintenance design: The split oil reservoir ring and threaded oil cup support replacement without disassembling the machine, reducing the maintenance time from 2 hours to less than 15 minutes. Attached Figure Description

[0023] 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 An exploded view of a sealing device for a tin fume conveying equipment provided by this utility model;

[0025] Figure 2 The front view of the integral oil reservoir ring is shown.

[0026] Figure 3 It indicates Figure 2 AA sectional view. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0028] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "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.

[0029] In tin smelting and recycling processes, tin fumes are mainly composed of ultrafine particles (primarily SnO2, SnS, and trace amounts of volatile metal compounds such as As, Pb, Zn, and Ce). Their unique physicochemical properties lead to several problems with traditional packing seals: ultrafine particle penetration and frictional failure caused by particle adhesion. Currently, common solutions involve frequent packing replacements (cycle < 10 days) or frequent adjustments to packing tightness (shaft loss > 5%) to address leakage. However, this results in soaring maintenance costs, with frequent packing replacements consuming significant manpower and resources, significantly increasing the cost per ton of tin processed. Energy efficiency is also low, with high shaft power loss and manual intervention further reducing equipment economics. Environmental risks exist, with leaked fumes causing on-site pollution and posing compliance risks for fugitive emissions. These technical bottlenecks indicate that traditional sealing structures can no longer meet the comprehensive requirements of tin fume conveying operations for long-term sealing, low energy consumption, and ease of maintenance.

[0030] In view of this, the solution provided by this utility model is: a sealing device for a tin fume conveying equipment, see attached document. Figure 1-3 The system includes a packing chamber 1, packing 2 disposed within the packing chamber 1, a pressure cap 4 connected to the packing chamber 1, and a rotating shaft penetrating the packing chamber 1. The packing 2 consists of at least two packing layers, with an oil reservoir ring 3 disposed between the two packing layers. An oil reservoir 5 is installed on the outer wall of the packing chamber 1. The outer diameter of the oil reservoir ring 3 is 0.1-0.2 mm smaller than the inner diameter of the packing chamber 1, forming a lubricant flow gap. Its inner diameter is 0.3-0.6 mm larger than the outer diameter of the rotating shaft, forming a non-contact fitting gap. The oil reservoir ring 3 is provided with a circumferential oil reservoir groove 301 and a radial oil guide hole 302 communicating with the oil reservoir groove 301. The oil reservoir 5 is connected to the packing chamber 1, and its oil outlet corresponds to the radial oil guide hole 302, forming a continuous oil passage to ensure that the lubricant can be injected into the intermediate chamber by gravity or external pressure.

[0031] It is worth noting that in this utility model, the packing chamber 1 adopts the main cavity structure of the traditional packing sealing device, and the inner wall and the rotating shaft form a dynamic sealing fit space.

[0032] Packing 2 refers to high-temperature resistant and wear-resistant fiber-based sealing packing (such as graphite impregnated asbestos packing) that is filled at both ends of the packing chamber to form an initial sealing layer.

[0033] The gland 4 refers to the gland that is connected to the packing chamber 1 by bolts, applies pre-tightening force to the packing layer, and fixes the axial position of the oil reservoir ring.

[0034] The sealing mechanism of this invention is as follows: High-temperature lubricating grease (such as lithium-based grease or perfluoropolyether grease) is injected into the oil reservoir 5. The lubricating grease enters the circumferential oil reservoir of the oil reservoir ring 3 through the channel of the oil reservoir 5, and is evenly distributed to the gaps between the packing chamber 1 and the packing 2, and between the packing 2 and the rotating shaft through radially arranged oil guide holes. The viscosity of the lubricating oil forms a continuous oil film with a thickness of 0.2-0.5 mm in the gap, filling the pores of the packing layer (conventional packing gaps >10 μm, tin fume particle size 1-5 μm), preventing ultrafine particles from penetrating; the incompressibility forms a constant pressure barrier in the sealed space to resist the intrusion of fumes; and the surface adhesion allows the oil film to be firmly adsorbed onto the surface of the rotating shaft and the packing, avoiding the surge in the coefficient of friction caused by the agglomeration of SnO2 particles due to moisture absorption.

[0035] The lubrication and compensation mechanism of this invention: The gap design of the oil reservoir ring 3 (0.1mm smaller outer diameter and 0.5mm larger inner diameter) allows the lubricating oil to form a dynamic pressure lubrication film when the shaft rotates, reducing the frictional power consumption between the packing and the shaft (reducing shaft power loss by more than 60% compared to traditional seals). Under high-temperature conditions, the fluidity of the lubricating oil compensates for the thermal expansion deformation of the packing material, avoiding seal failure caused by the packing hardening and loss of elasticity, eliminating the need for frequent manual tightening.

[0036] In this invention, the oil storage part 5 can be an oil cup, and the filling chamber 1 is provided with a connecting hole 101 corresponding to the outlet of the oil cup. The bottom of the oil cup is provided with a threaded interface, which is threadedly connected to the connecting hole 101.

[0037] Advantageously, the radial oil guide holes 302 have a diameter of 1-3 mm and are evenly distributed in 4-6 groups along the radial direction of the oil reservoir ring 3. The axial thickness of the oil reservoir ring 3 is 1.2-1.5 times the thickness of a single layer of the packing layer.

[0038] The oil storage ring 3 can be made of 316L stainless steel or Hastelloy, with a surface roughness Ra≤0.8μm.

[0039] In this utility model, temporary oil storage areas 303 are provided on both sides of the oil storage ring 3 along the axial direction and inside the sealing side of the two sets of packing layers.

[0040] Advantageously, the oil storage ring 3 is an integral structure or a split structure.

[0041] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] To better illustrate the application of this utility model, please refer to the following embodiments:

[0043] Example 1

[0044] Structural configuration:

[0045] The oil reservoir ring 3 is made of 316L stainless steel (Ra=0.6μm), with an outer diameter clearance of 0.15mm, an inner diameter clearance of 0.5mm, and an axial thickness of 12mm (the single layer of packing is 10mm thick × 1.2 times).

[0046] Four sets of radial oil guide holes 302 are provided, with a hole diameter of 2mm, and are evenly distributed circumferentially.

[0047] The bottom of the oil cup is provided with an M10 threaded interface, which is threaded to the φ8mm connection hole 101 of the packing chamber 1.

[0048] Implementation Results: Under operating conditions of 1200 r / min shaft speed and 250℃, lithium-based grease (dropping point 280℃) was injected, resulting in an oil film thickness of 0.3 mm. Testing was conducted after 90 days of continuous operation.

[0049] Leakage rate: 38 mL / h (520 mL / h for traditional seals);

[0050] Shaft power loss: 1.3kW (5.2kW for traditional seals);

[0051] Packing layer wear: ≤0.1mm (traditional seal wear ≥1.2mm).

[0052] Example 2

[0053] Structural optimization:

[0054] The oil reservoir ring 3 is made of Hastelloy (Ra=0.4μm), with an outer diameter gap of 0.2mm, an inner diameter gap of 0.6mm, and an axial thickness of 15mm (the single layer of packing is 10mm thick × 1.5 times).

[0055] Add temporary oil storage area 303: Machining grooves with a depth of 0.5mm on both sides of the oil storage ring, accounting for 15% of the volume.

[0056] Six sets of radial oil guide holes 302 are provided, with a hole diameter of 1.5mm, and are used with perfluoropolyether grease (temperature resistance 320℃).

[0057] Implementation results: Under a medium pressure of 0.3 MPa and a dust content of 20 g / m³, 3 Extreme operating condition testing:

[0058] Leakage rate: 45 mL / h (traditional seal leakage rate > 500 mL / h);

[0059] Shaft temperature rise: ≤15℃ (traditional seal temperature rise ≥40℃);

[0060] Maintenance cycle: 110 days (8 days for traditional seals).

[0061] Example 3 (The oil reservoir ring adopts a split structure)

[0062] Quick installation solution:

[0063] The oil reservoir ring 3 is designed as a split type, which is spliced ​​by positioning pins. During installation, it is directly embedded in the middle of the packing layer without the need to disassemble the bearing.

[0064] Oil cup 5 uses a quick-connect threaded connector, supporting online grease replenishment.

[0065] Maintenance efficiency: Replacing the oil reservoir ring takes 8 minutes (traditional packing replacement requires disassembling the gland, which takes 90 minutes), improving maintenance efficiency by 91%; single grease replenishment amount is 5g (traditional seals require stopping the machine to inject 10g of grease each time), extending the grease replenishment cycle to 30 days / time (traditionally once a day).

[0066] The correspondence between the technical features, effects, and embodiments of this utility model is shown in the table below:

[0067]

[0068] This invention solves the wear problem caused by ultrafine particle penetration and viscous agglomeration, extending the continuous operation cycle of the equipment; reducing maintenance costs, decreasing the frequency of packing replacement, reducing the frequency of manual intervention, lowering the cost of tin processing per ton, reducing shaft power loss, and significantly improving equipment energy efficiency.

[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0070] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A sealing device for a tin fume conveying equipment, comprising a packing chamber (1), packing (2) disposed within the packing chamber (1), a pressure cap (4) connected to the packing chamber (1), and a rotating shaft penetrating the packing chamber (1), characterized in that, The packing (2) consists of at least two packing layers, with an oil storage ring (3) between the two packing layers. An oil storage part (5) is installed on the outer wall of the packing chamber (1). The outer diameter of the oil storage ring (3) is 0.1-0.2 mm smaller than the inner diameter of the packing chamber (1) and forms a lubricant flow gap. Its inner diameter is 0.3-0.6 mm larger than the outer diameter of the rotating shaft and forms a non-contact fitting gap. The oil storage ring (3) is provided with a circumferential oil storage groove (301) and a radial oil guide hole (302) communicating with the oil storage groove (301). The oil storage part (5) is connected to the packing chamber (1), and its oil outlet corresponds to the radial oil guide hole (302) and forms a continuous oil passage.

2. A sealing device for a tin fume conveying equipment according to claim 1, characterized in that, The oil storage section (5) is an oil cup, and the filling chamber (1) is provided with a connection hole (101) on the outlet of the oil cup.

3. A sealing device for a tin fume conveying equipment according to claim 2, characterized in that, The bottom of the oil cup is provided with a threaded interface, which is connected to the connecting hole (101) by thread.

4. A sealing device for a tin fume conveying equipment according to claim 1, characterized in that, The diameter of the radial oil guide hole (302) is 1-3 mm, and there are 4-6 groups evenly distributed along the radial direction of the oil storage ring (3).

5. A sealing device for a tin fume conveying equipment according to claim 4, characterized in that, The axial thickness of the oil storage ring (3) is 1.2-1.5 times the thickness of a single layer of the packing layer.

6. A sealing device for a tin fume conveying equipment according to claim 4, characterized in that, The oil storage ring (3) is made of 316L stainless steel or Hastelloy, with a surface roughness Ra≤0.8μm.

7. A sealing device for a tin fume conveying equipment according to claim 4, characterized in that, Temporary oil storage areas (303) are provided on both sides of the oil storage ring (3) along the axial direction and inside the sealing side of the two sets of packing layers.

8. A sealing device for a tin fume conveying equipment according to any one of claims 1-7, characterized in that, The oil storage ring (3) is either an integral structure or a split structure.

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