Submersible sewage pump sealing structure
By designing spiral grooves and using wear-resistant materials in the submersible sewage pump, the problem of seal damage caused by leakage of sealing oil into the medium is solved, thus extending the service life of the submersible sewage pump.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HONGZE DALIAN PUMPS CO LTD
- Filing Date
- 2025-07-28
- Publication Date
- 2026-07-21
AI Technical Summary
When existing submersible sewage pumps are transporting media containing particles, the sealing oil in the sealing oil chamber may leak into the medium, causing damage to the seals, which in turn leads to water entering the motor housing, insulation failure, and pump shutdown.
A sealing structure for a submersible sewage pump was designed, including a mechanical seal bushing, a mechanical seal rotating ring, a mechanical seal stationary ring, a mechanical seal spring, a mechanical seal end cover, and a sealing chamber. The inner wall of the sealing chamber is provided with a spiral groove, which circulates and breaks down and discharges particulate media, reducing wear on the metal ring. Wear-resistant materials and springs are used to compensate for wear.
It extends the service life of the sealing structure, reduces the wear of the metal ring, and improves the reliability and durability of the submersible sewage pump.
Smart Images
Figure CN224533059U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pump sealing structure technology, and in particular to a sealing structure for a submersible sewage pump. Background Technology
[0002] Submersible sewage pumps are submersible sewage pumps, which are particularly suitable for conveying liquids containing hard solids, fibrous materials, as well as dirty, sticky, and slippery liquids.
[0003] The mechanical seal components of submersible sewage pumps on the market generally adopt a double-end mechanical seal A. The outer side of mechanical seal A is a sealing oil chamber B, which is filled with sealing oil to ensure motor insulation. For example... Figure 1 As shown, when a submersible sewage pump is conveying media containing particles, if the seal near the impeller is damaged, the sealing oil in the sealing oil chamber B will leak into the conveyed medium; the conveyed media containing particles will also fill the sealing oil chamber B, and the particles will cause severe wear. Over time, the motor-side seal will quickly fail, leading to water ingress into the motor housing and insulation failure. The submersible sewage pump will then stop working. Utility Model Content
[0004] This utility model mainly addresses the technical problems of existing submersible sewage pumps, which generally use double-end mechanical seals. When the submersible sewage pump is conveying media containing particles, if the seal near the impeller is damaged, the sealing oil in the sealing oil chamber will leak into the conveyed medium; the conveyed media containing particles will also fill the sealing oil chamber, causing the submersible sewage pump to stop working. The present invention proposes a sealing structure for submersible sewage pumps that can discharge the accumulated particulate media in the sealing chamber, thereby reducing the wear of the first and second metal rings and extending the service life of the sealing structure.
[0005] This utility model provides a sealing structure for a submersible sewage pump, including: a mechanical seal bushing, a mechanical seal rotating ring, a mechanical seal stationary ring, a mechanical seal spring, a mechanical seal end cover, and a sealing chamber;
[0006] The sealing chamber is located behind the impeller of the submersible sewage pump; the rear part of the sealing chamber is fixedly connected to the mechanical seal end cover; a spiral groove is formed on the inner wall of the sealing chamber.
[0007] The mechanical seal sleeve is fitted onto the pump shaft of the submersible sewage pump and is fixed to the pump shaft by the impeller of the submersible sewage pump;
[0008] A mechanical seal rotating ring is fixedly installed on the mechanical seal bushing; a first metal ring is inlaid at the rear of the mechanical seal rotating ring;
[0009] The stationary ring of the mechanical seal is disposed inside the end cap of the mechanical seal, and is located behind the moving ring of the mechanical seal; a second metal ring is embedded in the front part of the stationary ring of the mechanical seal; the second metal ring is in contact with the first metal ring;
[0010] A mechanical seal spring is installed behind the stationary ring of the mechanical seal.
[0011] Preferably, a rear end cover is fixedly disposed behind the mechanical seal end cover;
[0012] The inner wall of the end cap rear cover is provided with a three-lip seal.
[0013] Preferably, the mechanical seal bushing extends behind the end cover;
[0014] A coating is applied at the contact point between the mechanical seal bushing and the three-lip seal.
[0015] Preferably, the mechanical seal spring is located inside the end cover and the mechanical seal end cover.
[0016] Preferably, a first O-ring is provided on the outer side of the mechanical seal bushing; the first O-ring contacts the mechanical seal rotating ring.
[0017] Preferably, a second O-ring is provided on the inner wall of the mechanical seal end cap; the second O-ring is in contact with the mechanical seal stationary ring.
[0018] This invention provides a sealing structure for a submersible sewage pump. The inner wall of the sealing chamber has spiral grooves. These grooves circulate and break down particulate media within the sealing chamber, discharging any accumulated particles and reducing wear on the first and second metal rings, thus extending the service life of the sealing structure. The use of wear-resistant first and second metal rings to resist wear from particles that cannot be discharged through the spiral grooves significantly reduces wear and extends the seal's lifespan. A mechanical seal spring and a stationary mechanical seal ring compensate for wear between the first and second metal rings. This sealing structure extends the service life of the submersible sewage pump. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the sealing structure of a submersible sewage pump in the prior art;
[0020] Figure 2 This is a schematic diagram of the sealing structure of the submersible sewage pump provided by this utility model.
[0021] Reference numerals: 1. Impeller; 2. Mechanical seal bushing; 3. Mechanical seal rotating ring; 4. Mechanical seal stationary ring; 5. Mechanical seal spring; 6. Three-lip seal; 7. Mechanical seal end cover; 8. Sealing chamber; 9. Spiral groove; 10. Pump shaft; 11. First metal ring; 12. Second metal ring; 13. First O-ring seal; 14. End cover rear cover; 15. Coating; 16. Second O-ring seal; 17. Impeller bore. Detailed Implementation
[0022] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.
[0023] like Figure 2 As shown in the figure, the sealing structure of a submersible sewage pump provided in this embodiment of the present invention includes: a mechanical seal bushing 2, a mechanical seal rotating ring 3, a mechanical seal stationary ring 4, a mechanical seal spring 5, a mechanical seal end cover 7, and a sealing chamber 8.
[0024] The sealing chamber 8 is located behind the impeller 1 of the submersible sewage pump. The sealing chamber 8 is fixedly installed, while the impeller 1 is not fixed to the sealing chamber 8. The impeller 1 is mounted on the pump shaft 10 and can rotate under the drive of the pump shaft 10. The rear part of the sealing chamber 8 is fixedly connected to the mechanical seal end cover 7; a rear end cover 14 is fixedly installed behind the mechanical seal end cover 7.
[0025] The mechanical seal sleeve 2 is fitted onto the pump shaft 10 of the submersible sewage pump and is fixed to the pump shaft 10 by the impeller 1 of the submersible sewage pump; specifically, the mechanical seal sleeve 2 is engaged with the pump shaft 10 by the impeller 1 and the impeller nut. A key is provided between the mechanical seal sleeve 2 and the impeller 1, and rotation is generated by key transmission. The mechanical seal sleeve 2 extends from the rear of the impeller 1 to the rear of the end cover 14.
[0026] A mechanical seal rotating ring 3 is fixedly mounted on the mechanical seal bushing 2. Specifically, the mechanical seal rotating ring 3 is fixed to the mechanical seal bushing 2 by a pin, and the mechanical seal bushing 2 can drive the mechanical seal rotating ring 3 to rotate. A first O-ring seal 13 is provided on the outer side of the mechanical seal bushing 2; the first O-ring seal 13 contacts the mechanical seal rotating ring 3. A first metal ring 11 is embedded in the rear part of the mechanical seal rotating ring 3.
[0027] The stationary ring 4 of the mechanical seal is disposed inside the mechanical seal end cover 7 and is located behind the mechanical seal moving ring 3. The stationary ring 4 is not fixedly disposed inside the mechanical seal end cover 7 and can be axially displaced but cannot be rotated. A second O-ring 16 is disposed on the inner wall of the mechanical seal end cover 7. The second O-ring 16 is in contact with the stationary ring 4.
[0028] The front part of the mechanical seal stationary ring 4 is inlaid with a second metal ring 12; the second metal ring 12 is in contact with the first metal ring 11. A mechanical seal spring 5 is provided behind the mechanical seal stationary ring 4, and the mechanical seal spring 5 abuts against the rear part of the mechanical seal stationary ring 4. Specifically, the mechanical seal spring 5 is located inside the end cover rear cover 14 and the mechanical seal end cover 7. This utility model adopts a spring single-end mechanical seal structure according to the medium being a liquid containing particles.
[0029] The contact surfaces of the first metal ring 11 and the second metal ring 12 are smooth, and they are in close contact. The first metal ring 11 can rotate under the drive of the mechanical seal bushing 2 and the mechanical seal moving ring 3, while the second metal ring 12 does not rotate. The first metal ring 11 and the second metal ring 12 serve as a sealing surface, and they can generate friction to grind away impurities that enter between them. If the first metal ring 11 and the second metal ring 12 wear down, the mechanical seal stationary ring 4 can be axially displaced under the elastic force of the mechanical seal spring 5 to prevent gaps from forming between the first metal ring 11 and the second metal ring 12, ensuring that they always maintain close contact and guaranteeing the sealing performance of the structure. The mechanical seal spring 5 and the mechanical seal stationary ring 4 can compensate for wear between the first metal ring 11 and the second metal ring 12. The first metal ring 11 and the second metal ring 12 can be made of wear-resistant materials such as nickel-based tungsten carbide, sintered silicon carbide, or sintered alumina (ceramic).
[0030] Based on the above scheme, a triple-lip seal 6 is provided on the inner wall of the end cover 14, which can ensure that mechanical seal leakage is not visible. A coating 15 is provided at the contact position between the mechanical seal bushing 2 and the triple-lip seal 6. The coating 15 can be made of chromium-nickel alloy, which can protect the mechanical seal bushing 2 and prevent the triple-lip seal 6 from damaging the mechanical seal bushing 2.
[0031] Based on the above scheme, a spiral groove 9 is formed on the inner wall of the sealing chamber 8. Particulate impurities move inward along the inner wall of the sealing chamber 8 and can be captured by the spiral groove 9. The centrifugal force generated by the rotation of the liquid locks the particles in the spiral groove 9. The rotation of the liquid and the spiral groove 9 on the sealing chamber 8 transport the particles along a spiral path to the impeller hole 17, where they are discharged from the sealing chamber 8 by centrifugal force. By setting the spiral groove 9, the particulate medium circulating inside the sealing chamber 8 can be broken down, and by discharging the particulate medium accumulated in the sealing chamber 8, the wear of the first metal ring 11 and the second metal ring 12 can be reduced, extending the service life of the sealing structure. Tests have shown that the rotational separation of abrasive particles larger than 0.05 mm is effective. Since the corrosive wear of the seal is caused by particles within this size range, the wear is greatly reduced. Comparative tests show that the service life of the mechanical seal with and without the spiral groove 9 in the sealing chamber 8 is more than twice as long.
[0032] Wear on the sealing surface (the contact surface between the first metal ring 11 and the second metal ring 12) is caused by smaller particles that cannot be discharged through the spiral groove 9. Therefore, this invention uses wear-resistant first metal ring 11 and second metal ring 12 to resist wear from particles that cannot be discharged through the spiral groove 9, which greatly reduces wear and extends the seal's service life. The mechanical seal spring 5 and the mechanical seal stationary ring 4 compensate for wear between the first metal ring 11 and the second metal ring 12.
[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions for some or all of the technical features, do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A sealing structure for a submersible sewage pump, characterized in that, include: Mechanical seal bushing (2), mechanical seal rotating ring (3), mechanical seal stationary ring (4), mechanical seal spring (5), mechanical seal end cover (7) and sealing chamber (8); The sealing chamber (8) is located behind the impeller (1) of the submersible sewage pump; the rear part of the sealing chamber (8) is fixedly connected to the mechanical seal end cover (7); a spiral groove (9) is opened on the inner wall of the sealing chamber (8); The mechanical seal bushing (2) is fitted onto the pump shaft (10) of the submersible sewage pump and is fixed to the pump shaft (10) by the impeller (1) of the submersible sewage pump; A mechanical seal rotating ring (3) is fixedly installed on the mechanical seal bushing (2); a first metal ring (11) is inlaid at the rear of the mechanical seal rotating ring (3); The mechanical seal stationary ring (4) is disposed inside the mechanical seal end cap (7), and the mechanical seal stationary ring (4) is located behind the mechanical seal moving ring (3); the front part of the mechanical seal stationary ring (4) is inlaid with a second metal ring (12); the second metal ring (12) is in contact with the first metal ring (11); A mechanical seal spring (5) is provided behind the mechanical seal stationary ring (4).
2. The submersible sewage pump sealing structure according to claim 1, characterized in that, A rear end cover (14) is fixedly installed behind the mechanical seal end cover (7); The inner wall of the end cap rear cover (14) is provided with a three-lip seal (6).
3. The submersible sewage pump sealing structure according to claim 2, characterized in that, The mechanical seal bushing (2) extends behind the end cover (14); A coating (15) is provided at the contact position between the mechanical seal bushing (2) and the three-lip seal (6).
4. The submersible sewage pump sealing structure according to claim 2, characterized in that, The mechanical seal spring (5) is located inside the end cover rear cover (14) and the mechanical seal end cover (7).
5. The submersible sewage pump sealing structure according to claim 1, characterized in that, A first O-ring (13) is provided on the outer side of the mechanical seal bushing (2); the first O-ring (13) is in contact with the mechanical seal moving ring (3).
6. The submersible sewage pump sealing structure according to claim 1, characterized in that, The inner wall of the mechanical seal end cap (7) is provided with a second O-ring (16); the second O-ring (16) is in contact with the mechanical seal stationary ring (4).