Two-end-supported multistage pump with single-side shaft seal structure

Abstract

The utility model relates to the technical field of mechanical engineering pumps, and discloses a two-end supporting multistage pump with a single-side shaft seal structure, which comprises a non-driving end bearing box body and a driving end shell, a discharge section is arranged in the middle of the driving end shell, a balance drum, a balance drum sleeve, a balance drum clamping ring and a balance drum pressing ring are arranged in the discharge section, and the balance drum sleeve is arranged in the discharge section. The outer portion of the non-driving end bearing box body is fixedly connected with a non-driving end sealing box body, a non-driving end bearing gland is arranged in the non-driving end bearing box body, a mechanical seal is arranged in the non-driving end sealing box body, and the interior of the non-driving end bearing box body is rotationally connected with a first pump shaft. According to the utility model, a mechanical seal and components thereof, a bearing box body and components thereof, a cylindrical roller bearing and the like which are originally close to one side of a non-driving end are removed, so that the number of sealing components is reduced, and the production cost and the installation and maintenance cost are reduced to the maximum extent on the premise of ensuring stable operation.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical engineering pumps, in particular to a two-end supported multi-stage pump with a single-side shaft seal structure. Background Art

[0002] A multistage pump is a centrifugal pump that has multiple impellers connected in series on the same shaft.

[0003] A multi-stage pump with a single-sided shaft seal structure is a multi-stage centrifugal pump with a shaft seal device on one side of the pump shaft. The shaft seal is located on one side of the pump shaft, usually close to the drive end or non-drive end of the pump. This single-sided shaft seal structure makes the overall structure of the pump more compact, reduces the axial dimension of the pump, and facilitates installation and maintenance. Common single-sided shaft seal types include mechanical seals and stuffing seals.

[0004] In the existing technology, the two-end supported multi-stage pump with a single-side shaft seal structure has a simple structure and a reasonable design, and can well provide the function of liquid transportation. However, there are shortcomings in that the number of mechanical seals and related parts on the non-driving end is large, the manufacturing cost is high, the internal layout is unreasonable, and mechanical seals and rolling bearings are only provided near the driving end. The installation and debugging are time-consuming and labor-intensive, and there are many types of wearing parts. Therefore, a two-end supported multi-stage pump with a single-side shaft seal structure is proposed to solve the above problems. Utility Model Content

[0005] In order to make up for the above shortcomings, the utility model provides a two-end supported multi-stage pump with a single-side shaft seal structure, aiming to improve the problems of the existing technology such as a large number of parts, increased production costs, and time-consuming and labor-intensive installation and debugging.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A two-end supported multi-stage pump with a single-side shaft seal structure comprises a non-drive end bearing housing and a drive end housing, a discharge section is provided in the middle of the drive end housing, a balance drum, a balance drum sleeve, a balance drum clamping ring and a balance drum pressure ring are provided inside the discharge section, the non-drive end bearing housing is fixedly connected to the non-drive end sealing housing on the outside, a non-drive end bearing pressure cover is provided on the inside of the non-drive end bearing housing, a mechanical seal is provided on the inside of the non-drive end sealing housing, a pump shaft 1 is rotatably connected to the inside of the non-drive end bearing housing, a non-drive end bearing adjustment ring and an oil deflector are provided on the outside of the pump shaft 1, the The non-drive end bearing housing is internally rotatably connected to a tapered roller bearing, the outside of the pump shaft one is fixedly connected to a fan and a shaft elastic retaining ring, the outer periphery of the fan is provided with a fan cover, one end of the pump shaft one is fixedly connected to the pump shaft two, the outside of the pump shaft two is provided with an O-ring, a guide vane, a final stage guide vane and an impeller, the inside of the guide vane is provided with a guide vane ring and the pump shaft two, the outside of the pump shaft two is provided with a pump cover, the outside of the pump shaft two is provided with a suction section, the support method of the suction section and the discharge section both specifically adopts a central support method, and the inside of the drive end housing is provided with a lubrication component for lubricating the drive end of this pump;

[0008] As a further description of the above technical solution:

[0009] The lubrication assembly includes an oil slinger sleeve, which is arranged on the outside of the driving end housing, an oil slinger ring is arranged inside the non-driving end bearing housing, and a driving end baffle is arranged at one end of the pump shaft;

[0010] As a further description of the above technical solution:

[0011] The outer side of the pump shaft 1 is fixedly connected to a non-driving end sealing box, and a mechanical seal is provided inside the non-driving end sealing box;

[0012] As a further description of the above technical solution:

[0013] An oil-gas separator is provided on one side of the non-drive end bearing housing, and a suction section ring is provided on the outer side of the impeller;

[0014] As a further description of the above technical solution:

[0015] A heat dissipation pipe assembly is installed inside the non-drive end bearing housing, a constant position oil cup is fixedly connected to the outside of the non-drive end bearing housing, and an oil mark is provided on one side of the non-drive end bearing housing;

[0016] As a further description of the above technical solution:

[0017] The outer side of the pump shaft 2 is provided with a suction section, and the interior of the suction section is provided with a suction section ring;

[0018] As a further description of the above technical solution:

[0019] A plug and a middle section ring are provided on one side of the suction section ring, and a non-driving end oil-slinging ring sleeve and a non-driving end baffle are provided on the outer side of the pump shaft.

[0020] As a further description of the above technical solution:

[0021] A valve is fixedly connected to the outer side of the driving end housing, and a flange is fixedly connected to one side of the valve.

[0022] The utility model has the following beneficial effects:

[0023] 1. In the present invention, by removing the original mechanical seal and its components, bearing housing and its components, cylindrical roller bearings, etc. near the non-drive end, the sealing components are reduced, and the support method of the suction section and the discharge section is changed to a central support method to provide corresponding preload forces for the suction section and the discharge end. This can reduce the number of machined parts, fasteners, rolling bearings, mechanical seals and auxiliary systems of the pump, minimize production costs, installation and maintenance costs while ensuring stable operation, and reduce the overall installation size and space of the pump.

[0024] 2. In the utility model, the pump drives the pump shaft 2 to rotate, and the pump shaft 2 drives the oil slinger to rotate. The rotation of the oil slinger splashes a part of the lubricating oil into the bearing roller. The lubrication method of the bearing is changed from oil bath lubrication to splash lubrication, so that the bearing is better lubricated during operation, effectively improving the lubrication effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a three-dimensional schematic diagram of a two-end supported multi-stage pump with a single-side shaft seal structure proposed by the present invention;

[0026] Figure 2 This is a structural schematic diagram of an oil slinger of a multi-stage pump with two-end support and a single-side shaft seal structure proposed by the utility model;

[0027] Figure 3 This is a structural schematic diagram of an oil mark of a multi-stage pump with two-end support and a single-side shaft seal structure proposed by the utility model;

[0028] Figure 4 This is a structural schematic diagram of a heat dissipation pipe assembly of a multi-stage pump supported at both ends with a single-side shaft seal structure proposed by the present invention.

[0029] Legend:

[0030] 1. Fan cover; 3. Shaft circlip; 4. Fan; 5. Non-drive end bearing housing; 6. Non-drive end bearing gland; 7. Oil-vapor separator; 8. Tapered roller bearing; 9. Pump shaft 1; 10. Non-drive end bearing adjustment ring; 11. Oil deflector; 12. Drive end housing; 14. Mechanical seal; 15. Non-drive end seal housing; 17. Final stage guide vanes; 18. Discharge section; 21. O-ring; 22. Guide vanes; 23. Impeller; 25. Inlet ring; 26. Suction section; 29. Pump cover; 33. Oil-slinging sleeve; 34. Oil-slinging ring; 35. Drive end baffle; 37. Plug; 39. Guide vane mouth ring; 40. Middle section mouth ring; 41. Pump shaft 2; 42. Balance drum; 43. Balance drum sleeve; 44. Balance drum retaining ring; 45. Balance drum pressure ring; 46. Valve; 47. Flange; 48. Non-drive end oil-slinging ring sleeve; 49. Non-drive end baffle; 50. Constant level oil cup; 51. Oil mark; 52. Heat dissipation pipe assembly. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Reference Figure 1 and Figure 4The utility model provides an embodiment: a two-end support multi-stage pump with a single-side shaft seal structure, comprising a non-drive end bearing housing 5 and a drive end housing 12, wherein the non-drive end bearing housing 5 and the drive end housing 12 are respectively used to protect their respective internal components to ensure the operation stability of the pump, and a discharge section 18 is opened in the middle of the drive end housing 12, so a balance drum 42, a balance drum sleeve 43, a balance drum retaining ring 44, and a balance drum pressure ring 45 are arranged inside the discharge section 18, and the non-drive end bearing housing 5 is fixedly connected to the non-drive end sealing housing 15 on the outside, and the non-drive end The interior of the bearing housing 5 is provided with a non-drive end bearing pressure cover 6, the interior of the non-drive end sealing housing 15 is provided with a mechanical seal 14, the interior of the non-drive end bearing housing 5 is rotatably connected to a pump shaft 9, the outside of the pump shaft 9 is provided with a non-drive end bearing adjustment ring 10 and an oil baffle 11, the interior of the non-drive end bearing housing 5 is rotatably connected to a tapered roller bearing 8, the outside of the pump shaft 9 is fixedly connected to a fan 4 and an elastic retaining ring 3 for the shaft, the outer periphery of the fan 4 is provided with a fan cover 1, one end of the pump shaft 9 is fixedly connected to a pump shaft 2 41, and the outer side of the pump shaft 2 41 is provided with a An O-ring 21, a guide vane 22, a final guide vane 17 and an impeller 23 are provided. A guide vane ring 39 and a pump shaft 2 41 are provided on the inner side of the guide vane 22. A pump cover 29 is provided on the outer side of the pump shaft 21. The support mode of the suction section 26 and the discharge section 18 are specifically a central support mode. A lubrication component is provided inside the drive end housing 12 to lubricate the drive end of the pump. The support mode of the suction section 26 and the discharge section 18 are both centrally supported to provide a corresponding preload force to the suction section 26 and the discharge end 28, and the O-ring 21 is sealed to And the mechanical seal 14 seals to prevent the pumped medium from leaking to the outside. There is a radial gap of 0.1 to 0.15 mm between the balance drum 42 installed inside the protruding section and the balance drum 42 installed on the pump shaft 41. There are multiple grooves on the inner surface of the balance drum sleeve 43. The medium at the inlet is transferred here through multiple impellers 23, and a pressure drop is formed at both ends through the above-mentioned radial gap. At the same time, the original mechanical seal 14 and its components, bearing box and its components, cylindrical roller bearings, etc. near the non-drive end are removed, so as to reduce the sealing components, reduce production costs, and improve product performance.

[0033] Reference Figure 1 and Figure 2 The lubrication assembly includes an oil-slinging sleeve 33, which is arranged on the outside of the driving end housing 12, an oil-slinging ring 34 is arranged inside the non-driving end bearing box 5, and a driving end baffle 35 is arranged at one end of the pump shaft 2 41. The pump drives the pump shaft 2 41 to rotate, and the pump shaft 2 41 drives the oil-slinging ring 34 to rotate. The rotation of the oil-slinging ring 34 splashes part of the lubricating oil into the bearing roller. The lubrication method of the bearing is changed from oil bath lubrication to splash lubrication, so that the bearing is better lubricated during operation.

[0034] Reference Figures 1-4, the outside of the pump shaft 1 9 is fixedly connected to the non-drive end sealing box 15, and the inside of the non-drive end sealing box 15 is provided with a mechanical seal 14, which is used to seal the pump to prevent liquid leakage. An oil-gas separator 7 is provided on one side of the non-drive end bearing box 5, and a suction section ring 25 is provided on the outside of the impeller 23. The oil-gas separator 7 is used to centrifugally separate the oil-gas mixture to protect the normal operation of the pump. A heat dissipation pipe assembly 52 is installed inside the non-drive end bearing box 5, and a constant oil cup 50 is fixedly connected to the outside of the non-drive end bearing box 5. An oil mark 51 is provided on one side of the non-drive end bearing box 5. The constant oil cup 50 is used to keep the oil level stable, and the oil mark 51 is used for the operator to observe the oil level. The outside of the pump shaft 2 41 is provided A suction section 26 is provided, and a suction section mouth ring 25 is provided inside the suction section 26. The suction section mouth ring 25 is used to improve the flow state and prevent cavitation. A wire plug 37 and a middle section mouth ring 40 are provided on one side of the suction section mouth ring 25. A non-drive end oil-slinging ring sleeve 48 and a non-drive end deflector plate 49 are provided on the outside of the pump shaft 1 9. The pump drives the pump shaft 2 41 to rotate, and the pump shaft 2 41 drives the oil-slinging ring 34 to rotate. The rotation of the oil-slinging ring 34 splashes part of the lubricating oil into the bearing roller, and the lubrication method of the bearing is changed from oil bath lubrication to splash lubrication. A valve 46 is fixedly connected to the outside of the drive end housing 12, and a flange 47 is fixedly connected to one side of the valve 46. The valve 46 and the flange 47 are welded in sequence through a section of steel pipe at the lowest point of the discharge section 18 to provide external connection.

[0035] Working principle: First, the support method of the suction section 26 and the discharge section 18 adopts a central support method to provide corresponding preload force for the suction section 26 and the discharge end 28, and is sealed by the O-ring 21 and the mechanical seal 14 to prevent the pumped medium from leaking to the outside. There is a radial gap of 0.1 to 0.15 mm between the balance drum 42 installed inside the protruding section and the balance drum 42 installed on the pump shaft 41. There are multiple grooves on the inner surface of the balance drum sleeve 43. The medium at the inlet is transmitted here through multiple impellers 23, and a pressure drop is formed at both ends through the above-mentioned radial gap. At the same time, the original mechanical seal 14 and its components, bearing box and its components, cylindrical roller bearings, etc. near the non-drive end are removed, so as to reduce the sealing components, reduce production costs and improve product performance.

[0036] Secondly, during lubrication, the pump drives the pump shaft 2 41 to rotate, and the pump shaft 2 41 drives the oil slinger 34 to rotate. The rotation of the oil slinger 34 splashes part of the lubricating oil into the bearing rollers. The lubrication method of the bearing is changed from oil bath lubrication to splash lubrication, so that the bearing is better lubricated during operation.

[0037] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A two-end-supported multi-stage pump with a single-side shaft seal structure, comprising a non-drive end bearing housing (5) and a drive end housing (12), characterized in that: The middle part of the driving end housing (12) is provided with a discharge section (18), the interior of the discharge section (18) is provided with a balance drum (42), a balance drum sleeve (43), a balance drum retaining ring (44), and a balance drum pressure ring (45), the outside of the non-driving end bearing housing (5) is fixedly connected to the non-driving end sealing housing (15), the interior of the non-driving end bearing housing (5) is provided with a non-driving end bearing pressure cover (6), the interior of the non-driving end sealing housing (15) is provided with a mechanical seal (14), the interior of the non-driving end bearing housing (5) is rotatably connected to a pump shaft 1 (9), the outside of the pump shaft 1 (9) is provided with a non-driving end bearing adjustment ring (10) and an oil deflector (11), the interior of the non-driving end bearing housing (5) is rotatably connected to a tapered roller bearing (8), The outer side of the pump shaft (9) is fixedly connected to a fan (4) and a shaft elastic retaining ring (3), the outer side of the fan (4) is provided with a fan cover (1), one end of the pump shaft (9) is fixedly connected to the pump shaft (41), the outer side of the pump shaft (41) is provided with an O-ring (21), a guide vane (22), a final guide vane (17) and an impeller (23), the inner side of the guide vane (22) is provided with a guide vane ring (39) and the pump shaft (41), the outer side of the pump shaft (41) is provided with a pump cover (29), the outer side of the pump shaft (41) is provided with a suction section (26), the support method of the suction section (26) and the discharge section (18) are both specifically a central support method, and the interior of the drive end housing (12) is provided with a lubrication component for lubricating the drive end of the pump.

2. A two-end supported multi-stage pump with a single-side shaft seal structure according to claim 1, characterized in that: The lubrication assembly comprises an oil-slinging sleeve (33), the oil-slinging sleeve (33) being arranged on the outside of the driving end housing (12), an oil-slinging ring (34) being arranged inside the non-driving end bearing housing (5), and a driving end baffle (35) being arranged at one end of the second pump shaft (41).

3. The double-end-supported multi-stage pump with a single-side shaft seal structure according to claim 1, characterized in that: The outer side of the pump shaft 1 (9) is fixedly connected to a non-driving end sealing box (15), and a mechanical seal (14) is provided inside the non-driving end sealing box (15).

4. The double-end-supported multi-stage pump with a single-side shaft seal structure according to claim 1, characterized in that: An oil-gas separator (7) is provided on one side of the non-drive end bearing housing (5), and a suction section ring (25) is provided on the outer side of the impeller (23).

5. The double-end-supported multi-stage pump with a single-side shaft seal structure according to claim 1, characterized in that: A heat dissipation pipe assembly (52) is installed inside the non-drive end bearing housing (5), a constant position oil cup (50) is fixedly connected to the outside of the non-drive end bearing housing (5), and an oil mark (51) is provided on one side of the non-drive end bearing housing (5).

6. The double-end-supported multi-stage pump with a single-side shaft seal structure according to claim 1, characterized in that: The outer side of the second pump shaft (41) is provided with a suction section (26), and the interior of the suction section (26) is provided with a suction section opening ring (25).

7. The double-end-supported multi-stage pump with a single-side shaft seal structure according to claim 6, characterized in that: A thread plug (37) and a middle section mouth ring (40) are provided on one side of the suction section mouth ring (25), and a non-driving end oil-slinging ring sleeve (48) and a non-driving end baffle plate (49) are provided on the outer side of the pump shaft (9).

8. The double-end-supported multi-stage pump with a single-side shaft seal structure according to claim 1, characterized in that: A valve (46) is fixedly connected to the outer side of the driving end housing (12), and a flange (47) is fixedly connected to one side of the valve (46).

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