A pump body sealing structure

Abstract

The application discloses a pump body sealing structure, and aims at solving the problem of short service life of the sealing system of the pump body. The pump body sealing structure comprises a pump body, a main shaft, a pump cover, a sewage storage tank, an oil seal, a sealing ring, a gap sealing surface, an accumulation cavity, an inclined angle blade surface, and a flow guide hole. The main shaft is rotatably installed in the pump body. The pump cover is connected between the pump body and the sewage storage tank. One end of the main shaft is rotatably installed on the sewage storage tank. The oil seal is installed between the main shaft and the sewage storage tank. The sealing ring is fixedly connected on the main shaft. The gap sealing surface is formed between the outer wall of the sealing ring and the sewage storage tank. The accumulation cavity is formed between the end surface of the sealing ring and the pump body. The inclined angle blade surface is arranged on the end surface of the sealing ring and is arranged in the accumulation cavity. The flow guide hole is arranged on the sealing ring and is communicated between the accumulation cavity and the sewage storage tank. The pump body sealing structure can improve the service life of the sealing system, effectively prevent the invasion of harmful medium, delay the wear of the gap sealing surface, avoid the influence of the gap sealing effect caused by the increase of the gap, and prevent the mutual pollution of the oil cavity and the medium.

Description

Technical Field

[0001] This invention relates to a pump body technology, and more specifically, to a pump body sealing structure. Background Technology

[0002] Currently, sealing technology is widely used in mechanical equipment such as vacuum pumps and centrifugal pumps, especially in chemical industries where there are particulate materials, liquids, or corrosive media. Sealing technology directly affects the service life of these machines. Existing sealing technologies have the following problems: 1. Particulate media entering the friction surface quickly damages the seal; 2. The gelled substance formed after the sublimation of solvent-containing media accumulates on the shaft and creeps axially to the sealing surface, damaging the seal; 3. Sometimes, instantaneous high pressure and liquid media impact the seal, causing seal damage and allowing liquid to enter the oil chamber, emulsifying the lubricating oil and causing bearing failure; 4. Lubricating oil leaking through the seal contaminates materials. Summary of the Invention

[0003] To overcome the above shortcomings, the present invention provides a pump body sealing structure that can improve the service life of the sealing system, effectively prevent the intrusion of harmful media, delay the wear of the gap sealing surface, avoid affecting the gap sealing effect due to the increase of the gap, and prevent the oil cavity and the medium from contaminating each other.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a pump body sealing structure, comprising:

[0005] Pump body, with the main shaft installed inside the pump body;

[0006] Pump cover;

[0007] The sludge storage tank is connected between the pump body and the pump cover, and one end of the main shaft is rotatably mounted on the sludge storage tank.

[0008] An oil seal is installed between the main shaft and the sludge storage tank. A sealing ring is fixedly connected to the main shaft. A gap sealing surface is formed between the outer wall of the sealing ring and the sludge storage tank. A pressure accumulator is formed between the end face of the sealing ring and the pump body. An angled blade is provided on the end face of the sealing ring. The angled blade is placed in the pressure accumulator. A guide hole is provided on the sealing ring that connects the pressure accumulator and the sludge storage tank.

[0009] When the pump is operating, the sealing ring rotates with the main shaft. The angled blades on the end face of the sealing ring generate axial air pressure during rotation, effectively preventing harmful media from entering the pump body. The gap sealing surface effectively prevents harmful media from passing through. A guide hole is provided on the sealing ring. When the instantaneous pressure at the media end on the pump body side is too high, harmful media can pass through the guide hole and be thrown into the storage tank under centrifugal force, releasing some of the pressure at the media end. The guide hole reduces the amount of harmful media passing through the gap sealing surface, thereby delaying wear on the gap sealing surface and preventing the gap sealing effect from being affected by increased clearance. Lubricating oil leaking from the oil seal flows into the sludge tank for collection, thus preventing contamination of the media.

[0010] The pump body sealing structure of this invention can improve the service life of the sealing system, effectively prevent the intrusion of harmful media, delay the wear of the gap sealing surface, avoid affecting the gap sealing effect due to the increase of the gap, and prevent the oil cavity and the medium from contaminating each other.

[0011] Preferably, the sludge storage tank is provided with a sludge storage cavity and a mounting hole. The inner wall of the mounting hole is provided with an annular groove. The oil seal and the sealing ring are both installed between the mounting hole and the main shaft. The sealing ring is provided with an outwardly extending extension ring. The edge of the extension ring is provided with a retaining ring. The extension ring passes through the annular groove. The retaining ring is set in the sludge storage cavity and covers the opening of the annular groove.

[0012] The retaining ring is positioned near the opening of the annular groove on the inner wall of the sludge storage chamber, making it difficult for the medium in the sludge storage chamber to pass between the retaining ring and the inner wall of the sludge storage chamber. Therefore, the medium in the sludge storage chamber is less likely to flow into the oil seal.

[0013] Preferably, the guide hole includes an axial section and a radial section, with the axial section inclined outward in the direction away from the pressure storage cavity.

[0014] The inclined axial section makes it easier for the medium inside the guide hole to be thrown outward.

[0015] Preferably, a number of serrated protrusions are evenly distributed on the end face of the sealing ring, and the end faces of the protrusions are inclined to form an angled blade surface.

[0016] The serrated protruding end face is inclined to form an angled blade surface, which is easy to process, has good structural strength, is not easily damaged, and has a long service life.

[0017] Preferably, a 0.1mm-0.5mm gap is maintained between the outer wall of the sealing ring and the sludge storage tank.

[0018] The gap sealing surface designed in this structure can effectively prevent the passage of harmful media.

[0019] As a preferred option, the oil seal is a three-lip PTFE oil seal.

[0020] The three-lip PTFE oil seal is self-lubricating, has excellent wear resistance, and can provide good eccentricity compensation.

[0021] Preferably, a bushing is installed on the outer wall of the spindle, and an oil seal is fitted onto the bushing.

[0022] The bushing is made of 304 stainless steel with chromium oxide spraying and surface polishing, which has excellent wear resistance, long service life and outstanding corrosion resistance.

[0023] Preferably, bearing housings and end covers are installed at both ends of the sludge storage tank. The end covers are connected to the main shaft in a sleeve. One end of the sealing ring is sleeved between the end cover and the main shaft. The accumulator cavity is located between the end cover and the end of the sealing ring. The oil seal is sleeved on the bearing housing. The bearing is installed on the bearing housing and the bearing is connected to the main shaft in a sleeve.

[0024] The bearing housing and end cover facilitate the connection between the spindle and the sludge tank.

[0025] Preferably, a one-way air intake valve is installed on the upper part of the storage box, and a drain valve is installed on the lower part of the storage box.

[0026] When the sludge tank is under positive pressure, the one-way air inlet valve is closed, and the positive pressure prevents harmful media from entering. When the pressure at the medium end decreases, the axial air pressure generated by the beveled blades on the sealing ring creates negative pressure in the sludge tank. At this time, the one-way air inlet valve opens, allowing outside air to enter the sludge tank, thus generating continuous air pressure on the beveled blades on the sealing ring, preventing harmful media from entering. The drain valve facilitates the discharge of sludge from the sludge tank.

[0027] Preferably, a one-way pressure relief valve is installed in the guide hole, and a sliding sleeve is provided on the sludge tank and the gap sealing surface, with a positioning spring installed between the sliding sleeve and the sludge tank. The inner wall of the sliding sleeve facing the pump body is inclined inward to form an outer shielding surface, and the end of the sliding sleeve facing the pump body is placed in the accumulator cavity. The sealing ring is inclined inward to the outer wall of the pump body to form an inner shielding surface, and the outer shielding surface and the inner shielding surface are arranged opposite to each other.

[0028] As the sealing ring rotates with the main shaft, the angled blades on the sealing ring generate axial wind pressure. The airflow passes through the gap sealing surface, which can blow out the impurities remaining in the gap sealing surface, thus preventing impurities from remaining in the gap sealing surface and causing wear on the gap sealing surface.

[0029] When the instantaneous pressure at the pump body side of the medium end is too high, the pressure inside the accumulator chamber increases. This pressure acts on the end face of the sliding sleeve, pushing it to move. The outer shielding surface moves closer to the inner shielding surface, reducing the gap between them, or even causing them to come into a tight seal. Harmful media cannot easily pass through the gap sealing surface, preventing wear on it. At this time, harmful media can flow through the guide hole. The one-way pressure relief valve inside the guide hole opens, and the media in the guide hole is thrown into the storage tank under centrifugal force, releasing some of the pressure at the medium end. Harmful media cannot easily pass through the gap sealing surface, thus delaying wear and preventing the gap sealing effect from being affected by increased clearance.

[0030] Compared with the prior art, the beneficial effects of the present invention are: (1) A sludge storage chamber is established in the sludge storage tank to form a buffer zone, making it difficult for the lubricating oil and medium in the pump cover to contaminate each other. By utilizing the unique axial wind pressure, gap sealing, and flow guiding and pressure reducing structure of the sealing ring, the three-lip PTFE oil seal can finally work in a clean environment, which greatly improves the life of the seal. Generally, the life can be increased by 10-12 months; (2) The pump body sealing structure of the present invention can improve the service life of the sealing system, effectively prevent the intrusion of harmful media, delay the wear of the gap sealing surface, avoid the gap sealing effect being affected by the increase of the gap, and the oil chamber and medium are not easily contaminated by each other. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0032] Figure 2 This is a schematic diagram of the sealing ring structure of Embodiment 1 of the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0034] Figure 4 This is the present invention. Figure 3 A magnified view of position A in the middle;

[0035] In the diagram: 1. Pump body, 2. Main shaft, 3. Pump cover, 4. Oil chamber, 5. Sludge tank, 6. Oil seal, 7. Sealing ring, 8. Gap sealing surface, 9. Accumulator chamber, 10. Angled blade, 11. Guide hole, 12. Axial section, 13. Radial section, 14. Protrusion, 15. Sludge tank, 16. Mounting hole, 17. Annular groove, 18. Extension ring, 19. Retaining ring, 20. One-way air intake valve, 21. Sludge discharge valve, 22. Bearing housing, 23. End cover, 24. Shaft sleeve, 25. Positioning ring, 26. One-way pressure relief valve, 27. Sliding sleeve, 28. Positioning spring, 29. Connecting ring, 30. Sliding ring groove, 31. Outer shielding surface, 32. Inner shielding surface. Detailed Implementation

[0036] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0037] Example 1: A pump body sealing structure (see attached) Figure 1 Appendix Figure 2 ),include:

[0038] Pump body 1, with main shaft 2 installed inside the pump body; the pump body can be either a centrifugal pump body or a vacuum pump body.

[0039] Pump cover 3, with an oil chamber 4 inside the pump cover, the oil chamber being filled with lubricating oil;

[0040] The sludge storage tank 5 is connected between the pump body and the pump cover, and one end of the main shaft is rotatably mounted on the sludge storage tank;

[0041] An oil seal 6, a three-lip PTFE oil seal, is installed between the main shaft and the sludge tank. A sealing ring 7 is fixedly connected to the main shaft. The oil seal is placed between the pump cover and the sealing ring. A gap sealing surface 8 is formed between the outer wall of the sealing ring and the sludge tank. A pressure accumulator 9 is formed between the end face of the sealing ring and the pump body. An angled blade 10 is provided on the end face of the sealing ring, and the angled blade is placed in the pressure accumulator. A guide hole 11 is provided on the sealing ring, connecting the pressure accumulator and the sludge tank. The guide hole includes an axial section 12 and a radial section 13. The axial section is inclined outward away from the pressure accumulator, and the radial section is radially arranged. Several serrated protrusions 14 are evenly distributed on the end face of the sealing ring, and the end faces of the protrusions are inclined to form angled blades.

[0042] A 0.1mm-0.5mm gap is maintained between the outer wall of the sealing ring and the sludge storage tank. In this embodiment, a 0.3mm gap is maintained between the outer wall of the sealing ring and the sludge storage tank. The sludge storage tank is provided with a sludge storage cavity 15 and a mounting hole 16. An annular groove 17 is provided on the inner wall of the mounting hole. The oil seal and the sealing ring are both installed between the mounting hole and the main shaft. The inner wall of the sealing ring has a stepped structure. An outwardly extending extension ring 18 is provided on the sealing ring. A retaining ring 19 is provided on the edge of the extension ring. The extension ring passes through the annular groove. The retaining ring is set in the sludge storage cavity and covers the opening of the annular groove. The radial section of the guide hole extends to the outer wall of the retaining ring. The axial length of the retaining ring is greater than the axial length of the extension ring. A one-way air inlet valve 20 is installed on the upper part of the storage tank, and a sludge discharge valve 21 is installed on the lower part of the storage tank. Both the one-way air inlet valve and the sludge discharge valve are connected to the sludge storage cavity.

[0043] Bearing seats 22 and end caps 23 are installed at both ends of the sludge storage tank, respectively. Sealing rings are installed between the bearing seats and the sludge storage tank, and between the end caps and the sludge storage tank. The bearing seats and end caps are connected to the two ends of the mounting holes on the sludge storage tank. The end caps are connected to the main shaft assembly. One end of the sealing ring is fitted between the end cap and the main shaft. The accumulator cavity is located between the end cap and the end of the sealing ring. The oil seal is fitted onto the bearing seat, and a bearing is installed on the bearing seat. The bearing is connected to the main shaft assembly. A bushing 24 is installed on the outer wall of the main shaft, and the oil seal is fitted onto the bushing and positioned between the bushing and the bearing seat. A locating ring 25 is installed between the inner ring of the bearing and the bushing. Both ends of the bushing abut against the sealing ring and the locating ring, respectively. The bushing is made of 304 stainless steel and coated with chromium oxide. The oil seal skeleton is made of 304 stainless steel, and the lip is made of polytetrafluoroethylene.

[0044] When the pump is operating, the sealing ring rotates with the main shaft. The angled blades on the end face of the sealing ring generate axial air pressure during rotation, effectively preventing harmful media from entering the pump body. The gap sealing surface effectively prevents harmful media from passing through. A guide hole is provided on the sealing ring. When the instantaneous pressure at the media end on the pump body side is too high, harmful media can pass through the guide hole and be thrown into the storage tank under centrifugal force, releasing some of the pressure at the media end. The guide hole reduces the amount of harmful media passing through the gap sealing surface, thereby delaying wear on the gap sealing surface and preventing the gap sealing effect from being affected by increased clearance. Lubricating oil leaking from the oil seal flows into the sludge tank for collection, thus preventing contamination of the media.

[0045] Example 2: A pump body sealing structure (see attached) Figure 3 Appendix Figure 4 The structure is similar to that of Embodiment 1, with the main difference being that a one-way pressure relief valve 26 is installed in the guide hole in this embodiment, a sliding sleeve 27 is provided on the sludge tank corresponding to the gap sealing surface, a positioning spring 28 is installed between the sliding sleeve and the sludge tank, a connecting ring 29 is installed in the mounting hole on the sludge tank, the sliding sleeve is installed on the connecting ring, and the gap between the inner wall of the connecting ring and the outer wall of the sealing ring forms a gap sealing surface. A stepped surface is provided on the inner wall of the mounting hole, one end of the sliding sleeve abuts against the stepped surface, a sliding ring groove 30 is provided on the connecting ring, and the other end of the sliding sleeve and the positioning spring are both placed in the sliding ring groove. The inner wall of the sliding sleeve facing the pump body is inclined inward to form an outer shielding surface 31, the end of the sliding sleeve facing the pump body is placed in the accumulator cavity, and the outer wall of the sealing ring facing the pump body is inclined inward to form an inner shielding surface 32. The outer shielding surface and the inner shielding surface are arranged opposite each other. Other structures are the same as in Embodiment 1.

[0046] As the sealing ring rotates with the main shaft, the angled blades on the sealing ring generate axial wind pressure. The airflow passes through the gap sealing surface, which can blow out the impurities remaining in the gap sealing surface, thus preventing impurities from remaining in the gap sealing surface and causing wear.

[0047] When the instantaneous pressure at the pump body side of the medium end is too high, the pressure inside the accumulator chamber increases. This pressure acts on the end face of the sliding sleeve, pushing it to move. The outer shielding surface moves closer to the inner shielding surface, reducing the gap between them, or even causing them to come into a tight seal. Harmful media cannot easily pass through the gap sealing surface, preventing wear on it. At this time, harmful media can flow through the guide hole. The one-way pressure relief valve inside the guide hole opens, and the media in the guide hole is thrown into the storage tank under centrifugal force, releasing some of the pressure at the medium end. Harmful media cannot easily pass through the gap sealing surface, thus delaying wear and preventing the gap sealing effect from being affected by increased clearance.

[0048] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Other variations and modifications may be made without departing from the technical solutions described in the claims.

Claims

1. A pump body sealing structure, characterized in that, include: Pump body, with the main shaft installed inside the pump body; Pump cover; The sludge storage tank is connected between the pump body and the pump cover, and one end of the main shaft is rotatably mounted on the sludge storage tank. An oil seal is installed between the main shaft and the sludge storage tank. A sealing ring is fixedly connected to the main shaft. A gap sealing surface is formed between the outer wall of the sealing ring and the sludge storage tank. A pressure accumulator is formed between the end face of the sealing ring and the pump body. An angled blade is provided on the end face of the sealing ring. The angled blade is placed in the pressure accumulator. A guide hole is provided on the sealing ring that connects the pressure accumulator and the sludge storage tank.

2. The pump body sealing structure according to claim 1, characterized in that, The sludge storage tank is provided with a sludge storage cavity and a mounting hole. The inner wall of the mounting hole is provided with an annular groove. The oil seal and sealing ring are installed between the mounting hole and the main shaft. The sealing ring is provided with an outwardly extending extension ring. The edge of the extension ring is provided with a retaining ring. The extension ring passes through the annular groove. The retaining ring is set in the sludge storage cavity and covers the opening of the annular groove.

3. The pump body sealing structure according to claim 1, characterized in that, The guide hole includes an axial section and a radial section, with the axial section inclined outwards in the direction away from the pressure storage cavity.

4. The pump body sealing structure according to claim 1, characterized in that, Several serrated protrusions are evenly distributed on the end face of the sealing ring, and the end faces of the protrusions are inclined to form an angled blade surface.

5. The pump body sealing structure according to claim 1, characterized in that, A 0.1mm-0.5mm gap is maintained between the outer wall of the sealing ring and the sludge storage tank.

6. The pump body sealing structure according to claim 1, characterized in that, The oil seal is a three-lip PTFE oil seal.

7. The pump body sealing structure according to claim 1, characterized in that, A bushing is installed on the outer wall of the spindle, and an oil seal is fitted onto the bushing.

8. The pump body sealing structure according to claim 1, characterized in that, Bearing housings and end covers are installed at both ends of the sludge storage tank. The end covers are connected to the main shaft. One end of the sealing ring is fitted between the end cover and the main shaft. The accumulator cavity is located between the end cover and the end of the sealing ring. The oil seal is fitted on the bearing housing. The bearing is installed on the bearing housing and connected to the main shaft.

9. A pump body sealing structure according to any one of claims 1 to 8, characterized in that, A one-way air intake valve is installed on the top of the storage box, and a drain valve is installed at the bottom of the storage box.

10. A pump body sealing structure according to any one of claims 1 to 8, characterized in that, A one-way pressure relief valve is installed in the flow guide hole. A sliding sleeve is provided on the sludge storage tank and the gap sealing surface. A positioning spring is installed between the sliding sleeve and the sludge storage tank. The inner wall of the sliding sleeve facing the pump body is inclined inward to form an outer shielding surface. The end of the sliding sleeve facing the pump body is placed in the accumulator cavity. The sealing ring is inclined inward to the outer wall of the pump body to form an inner shielding surface. The outer shielding surface and the inner shielding surface are arranged opposite each other.

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