Bearing box for non-driving end of multistage centrifugal pump

Abstract

The utility model discloses a bearing box for a non-driving end of a pump, and belongs to the field of multi-stage centrifugal pumps. The bearing box comprises a box body, a pump shaft partially extends into the box body, a first space and a second space which are arranged side by side in the axial direction of the pump shaft are formed in the box body, a rolling bearing is arranged in the first space, and a sliding bearing assembly is arranged in the second space; the sliding bearing assembly is matched with the box body in the radial direction, is connected and positioned through a cylindrical pin in the circumferential direction, is arranged outside the pump shaft in a sleeving mode and is used for bearing radial force of the pump; the rolling bearing is fixedly arranged on the pump shaft in a sleeving mode and used for bearing axial force of the pump. The bearing box for the non-driving end of the pump is convenient to install and maintain and low in cost.

Description

Technical Field

[0001] The utility model belongs to the field of multi-stage centrifugal pumps, in particular to a bearing box used for a non-driving end of a pump. Background Art

[0002] Multistage centrifugal pumps are important equipment widely used in industries such as petroleum, chemical engineering, metallurgy, and electric power. Their function is to inject water or other liquids into equipment or processes for cooling, cleaning, lubrication, and energy transfer. Multistage centrifugal pumps offer high outlet pressure, high power, multiple impeller stages, and strong axial force.

[0003] At present, most multi-stage centrifugal pumps use a thrust bearing and a radial bearing in combination at the non-drive end, and use a forced lubrication system of a lubricating oil station to lubricate the thrust bearing and the radial bearing. The thrust bearing is used to bear the axial force of the pump, and the radial bearing is used to bear the radial force of the pump.

[0004] Bearings offer the advantages of high precision and strong stability. However, due to the large contact area between the bearing and the pump shaft, they are prone to wear under high loads and are difficult to replace. This makes multi-stage centrifugal pumps difficult to install and maintain, and their operating costs high. Therefore, it is crucial to reduce the difficulty and cost of installation and maintenance while achieving the same function. Utility Model Content

[0005] The utility model provides a bearing box for a non-driving end of a multi-stage centrifugal pump, so as to solve the problems of difficult installation and maintenance and high installation and replacement costs of the existing bearing box.

[0006] In order to solve the above technical problems, the embodiments of the present invention adopt the following technical solutions:

[0007] A bearing box for the non-drive end of a multi-stage centrifugal pump, the bearing box comprising a box body, a pump shaft partially extending into the box body, the interior of the box body having a first space and a second space arranged side by side along the axial direction of the pump shaft, a rolling bearing being provided in the first space, and a sliding bearing assembly being provided in the second space; the sliding bearing assembly radially cooperates with the box body, is circumferentially connected and positioned by a cylindrical pin, and is sleeved on the outside of the pump shaft, the sliding bearing assembly being used to withstand the radial force of the pump; the rolling bearing is fixedly sleeved on the pump shaft, and is used to withstand the axial force of the pump.

[0008] According to some embodiments of the present invention, a bearing cover is further included, which is fixedly connected to the housing. The bearing cover has a protruding structure. The rolling bearing includes an outer ring. The protruding structure enters the housing and axially positions the outer ring.

[0009] According to some embodiments of the present invention, a bearing sleeve is further included. The bearing sleeve is sleeved outside the outer ring, and a unilateral gap exists between the bearing sleeve and the outer ring to ensure that the rolling bearing does not bear radial force.

[0010] According to some embodiments of the present invention, the width of the single-side gap is 0.1mm-0.3mm.

[0011] According to some embodiments of the present invention, the bearing sleeve has a protrusion, the bearing cover is provided with a groove, the protrusion is inserted into the groove, and the bearing cover is used to circumferentially position the bearing sleeve.

[0012] According to some embodiments of the present invention, it also includes a first lubricating oil circuit, a second lubricating oil circuit and a recovery oil circuit, and a first oil inlet, a second oil inlet and an oil outlet are opened on the casing; the first lubricating oil circuit supplies lubricating oil to the rolling bearing through the first oil inlet, and the second lubricating oil circuit supplies lubricating oil to the sliding bearing assembly through the second oil inlet, and the recovery oil circuit sends the lubricating oil in the first lubricating oil circuit and the second lubricating oil circuit out of the casing through the oil outlet.

[0013] According to some embodiments of the present invention, the first lubricating oil circuit includes an oil inlet pipe, which is passed through and fixed in the bearing gland, and an oil outlet of the oil inlet pipe extends into the housing and is close to the rolling bearing.

[0014] According to some embodiments of the present invention, the rolling bearing further includes an inner ring, the pump shaft sleeve is provided with a shaft sleeve, and the inner ring is interference-connected with the shaft sleeve.

[0015] According to some embodiments of the present invention, a press sleeve is fixedly provided at the end of the pump shaft, and the press sleeve is in axial contact with the inner ring.

[0016] According to some embodiments of the present invention, the rolling bearing is a three-point contact ball bearing.

[0017] The beneficial effects of the present invention compared with the prior art are:

[0018] The thrust bearing of the bearing box provided by the utility model adopts a three-point contact ball bearing, which has a simple and reliable structure, is easy to install and maintain, and has low cost;

[0019] The bearing box provided by the utility model delivers lubricating oil to the rolling element of the rolling bearing through the oil inlet pipe, which can reduce the amount of lubricating oil while improving the lubrication effect;

[0020] The bearing box provided by the utility model realizes the circumferential positioning of the rolling bearing and the bearing sleeve by arranging the bearing gland and the protruding structure on the bearing gland;

[0021] The bearing box provided by the utility model has a groove formed on the bearing cover and a protrusion on the bearing sleeve, and the protrusion is stuck in the groove, so that the bearing cover is circumferentially positioned on the bearing sleeve. The structure is simple and reliable and easy to mass produce. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A cross-sectional view of the bearing box provided by the utility model;

[0024] Figure 2 A schematic diagram of the housing structure of the bearing box provided by the present invention;

[0025] Figure 3 This is a structural diagram of the outer body and the second oil inlet of the bearing box provided by the utility model;

[0026] Figure 4 This is a schematic diagram of the bearing outer sleeve and press sleeve structure of the bearing box provided by the utility model.

[0027] The reference numerals in the figures are:

[0028] 1. Bearing box cover; 2. Bearing box body; 3. Sliding bearing assembly; 4. Oil outlet flange; 5. First oil inlet flange; 6. Bearing sleeve; 61. Protrusion; 7. Oil inlet pipe; 8. Bearing cover; 9. Eye screw; 10. Air bleed valve; 11. First screw; 12. Second threaded pin; 13. Third screw; 14. Fourth screw; 15. Cylindrical pin; 16. First sealing ring; 17. Second sealing ring; 18. Third sealing ring; 19. Bushing; 20. Press sleeve; 201. Protrusion structure; 202. Groove; 21. First oil inlet pipe flange; 22. Second oil inlet pipe flange; 23. Oil outlet pipe flange; 24. Bearing isolator; 25. Rolling bearing; 26. Pump shaft; 27. Locking piece; 28. Second oil inlet flange; 100. First oil inlet; 200. Second oil inlet; 300. Oil outlet. DETAILED DESCRIPTION

[0029] The following description provides specific application scenarios and requirements for this specification, with the goal of enabling those skilled in the art to make and use the contents of this specification. Various modifications to the disclosed embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but is intended to be accorded the broadest scope consistent with the claims.

[0030] The terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. For example, as used herein, the singular forms "a," "an," and "the" may also include the plural forms unless the context clearly indicates otherwise. When used in this specification, the terms "comprise," "include," and / or "contain" are intended to refer to the presence of the associated integers, steps, operations, elements, and / or components, but do not preclude the presence of one or more other features, integers, steps, operations, elements, components, and / or groups or the addition of other features, integers, steps, operations, elements, components, and / or groups in the system / method.

[0031] In this utility model, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inside," "outside," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe the utility model and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0032] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0033] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0034] These and other features of this specification, as well as the operation and function of the associated elements of the structure, and the economical assembly and manufacture of the components, can be significantly improved with consideration of the following description. Reference is made to the accompanying drawings, all of which form a part of this specification. However, it should be expressly understood that the drawings are for illustration and description purposes only and are not intended to limit the scope of this specification. It should also be understood that the drawings are not drawn to scale.

[0035] The function of the bearing housing is to carry the various radial, axial, or combined forces transmitted from the shaft to the bearings, and then from the bearings to the bearing housing. It also bears the weight of the components in the bearing housing assembly and the weight of the lubricant required to ensure adequate lubrication of the bearings. The bearing housing must have sufficient mechanical strength and high requirements for structural design and machining precision, including heat treatment requirements to eliminate stresses.

[0036] like Figure 1 As shown, a bearing box for the non-drive end of a multi-stage centrifugal pump includes: a box body, a sliding bearing assembly 3 and a rolling bearing 25. In this embodiment, the sliding bearing assembly 3 includes a radial sliding bearing, and the rolling bearing 25 is a three-point contact ball bearing. In order to facilitate the installation and replacement of various components at the non-output end, as shown in FIG. Figure 2 and Figure 3 As shown, the housing is formed by a combination of a bearing housing cover 1 and a bearing housing body 2, and a second threaded pin 12 is provided on the bearing housing body 2 for positioning, and is connected to the bearing housing cover 1 by a first screw 11. In order to achieve a stable connection, the first screw 11 is a hexagon socket head screw, and the second threaded pin 12 is an internal threaded cylindrical pin. The sliding bearing assembly 3 is radially positioned by a mounting seat provided in the bearing housing cover 1, and the cylindrical pin 15 fixes the sliding bearing assembly 3 to the bearing housing cover 1, performing circumferential and axial positioning of the sliding bearing assembly 3. By completing the axial positioning, circumferential positioning and radial positioning of the sliding bearing assembly 3, the sliding bearing assembly 3 is also sleeved on the pump shaft 26 and can withstand the radial force of the pump shaft 26.

[0037] The rolling bearing 25 is sleeved on the pump shaft 26, with the inner ring and sleeve 19 interferingly fitted. The sleeve 19 and the pump shaft 26 are axially positioned by a shaft shoulder. A press sleeve 20 is provided at the end of the pump shaft 26. The press sleeve 20 presses against the inner ring of the rolling bearing 25 to prevent axial movement of the rolling bearing 25 on the pump shaft 26 while facilitating the transmission of axial loads. The press sleeve 20 is fixed to the pump shaft 26 by two locking members 27. For a secure fixation, the locking members 27 are round nuts.

[0038] A bearing sleeve 6 is mounted on the outer ring of rolling bearing 25 and secured to a stopper on bearing housing cover 1. A radial clearance exists between bearing sleeve 6 and the outer ring of rolling bearing 25 to protect rolling bearing 25 from radial forces. In some embodiments, the width of this clearance is 0.1 mm to 0.3 mm. In this embodiment, the width of this clearance is 0.2 mm.

[0039] A bearing cover 8 is installed on the outer walls of the bearing housing cover 1 and the bearing housing body 2. This cover 8 is secured to the bearing housing cover 1 and the bearing housing body 2 via fourth screws 14 located at both ends. In this embodiment, fourth screws 14 are hexagon socket head screws. A protrusion 201 is provided on the bearing cover 8. This protrusion 201 is capable of entering the bearing housing and approaching the rolling bearing 25, thereby axially positioning the outer ring of the rolling bearing 25.

[0040] A protrusion 61 is provided on the side of the bearing sleeve 6 close to the bearing box cover 1. Correspondingly, a groove 202 is provided on the raised structure 201 of the bearing pressure cover 8, and the protrusion 61 is snapped into the groove 202, so that the bearing pressure cover 8 can be used to circumferentially position the bearing sleeve 6 through the raised structure 201.

[0041] To ensure smooth flow of lubricating oil within the bearing housing, a first oil inlet 100 is defined within the bearing gland 8, and an oil outlet 300 is defined on the outer wall of the bearing housing body 2. The first oil inlet 100 communicates with the oil outlet 300, supplying lubricating oil to the rolling bearing 25 for lubrication and cooling. Similarly, a second oil inlet 200 is defined within the outer wall of the bearing housing body 2 for communication with the oil outlet 300, supplying lubricating oil to the sliding bearing assembly 3 for lubrication and cooling.

[0042] To improve the lubrication of the rolling elements in rolling bearing 25 and reduce friction, an oil inlet pipe 7 is provided within bearing gland 8. This pipe extends deep into the bearing housing and faces the rolling elements in rolling bearing 25, directly delivering lubricating oil to the rolling elements. To prevent leakage of lubricating oil, a first sealing ring 16 is provided on bearing gland 8 for sealing.

[0043] To ensure connection and sealing between the lubricating oil lines, a first oil inlet flange 5 is mounted on the outside of the bearing gland 8. This first oil inlet flange 5 is secured to the bearing gland 8 by third screws 13. In this embodiment, third screws 13 are hexagon socket head screws. A first oil inlet flange 21 is welded to the outside of the first oil inlet flange 5. Lubricating oil at a pressure of 0.05 to 0.2 MPa is passed through the first oil inlet port 100 within the first oil inlet flange 21 to lubricate and cool the rolling bearing 25.

[0044] Similarly, a second oil inlet flange 28 is provided at the second oil inlet port 200. This second oil inlet flange 28 is secured to the outer wall of the bearing housing body 2 by screws. In this embodiment, the screws are hexagon socket head screws. A second oil inlet flange 22 is welded to the outside of the second oil inlet flange 28. To prevent lubricating oil leakage, a second sealing ring 17 is provided on the second oil inlet flange 28. Lubricating oil at a pressure of 0.05 to 0.2 MPa is passed through the second oil inlet port 200 within the second oil inlet flange 22 to lubricate and cool the sliding bearing assembly 3.

[0045] Similarly, an oil outlet flange 4 is provided at the oil outlet 300, secured to the outer wall of the bearing housing body 2 by screws. In this embodiment, the screws are hexagon socket head screws. To prevent lubricating oil leakage, a third sealing ring 18 is provided on the oil outlet flange 4 for sealing. An oil outlet pipe flange 23 is welded to the outside of the oil outlet flange 4. The oil outlet flange 4 recovers lubricating oil from both the rolling bearing 25 and the sliding bearing assembly 3 through the oil outlet 300, forming a circulating oil circuit and achieving forced lubrication of the bearing housing.

[0046] In order to protect the bearing from external pollution and wear, a bearing isolator 24 is provided on the right inner hole of the bearing box cover 1 and the bearing box body 2 combination and the pump shaft 26, thereby sealing the right side of the bearing box.

[0047] In order to maintain the internal pressure balance of the bearing box, three air release valves 10 are provided on the bearing box cover 1. The air release valves 10 can release air from the three cavities to ensure the pressure balance in the bearing box. A lifting eye screw 9 is provided on the top of the bearing box cover 1 to facilitate the lifting and transportation of the bearing box.

[0048] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A bearing box for a non-drive end of a pump, the bearing box comprising a housing, a pump shaft portion extending into the housing, characterized in that: The interior of the housing has a first space and a second space arranged side by side along the axial direction of the pump shaft. A rolling bearing is provided in the first space, and a sliding bearing assembly is provided in the second space. The sliding bearing assembly is radially matched with the housing, circumferentially connected and positioned by cylindrical pins, and sleeved on the outside of the pump shaft. The sliding bearing assembly is used to withstand the radial force of the pump. The rolling bearing is fixedly sleeved on the pump shaft, and is used to withstand the axial force of the pump.

2. The bearing box according to claim 1, characterized in that It also includes a bearing cover, which is fixedly connected to the housing. The bearing cover has a protruding structure. The rolling bearing includes an outer ring. The protruding structure enters the housing and axially positions the outer ring.

3. The bearing box according to claim 2, characterized in that It also includes a bearing outer sleeve, which is sleeved outside the outer ring, and there is a unilateral gap between the bearing outer sleeve and the outer ring to ensure that the rolling bearing does not bear radial force.

4. The bearing box according to claim 3, characterized in that The width of the single-side gap is 0.1mm-0.3mm.

5. The bearing box according to claim 3, wherein: The bearing sleeve has a protrusion, and the bearing cover is provided with a groove, the protrusion is stuck in the groove, and the bearing cover is used for circumferential positioning of the bearing sleeve.

6. The bearing housing according to claim 1, wherein: It also includes a first lubricating oil circuit, a second lubricating oil circuit and a recovery oil circuit, and the box body is provided with a first oil inlet, a second oil inlet and an oil outlet; the first lubricating oil circuit supplies lubricating oil to the rolling bearing through the first oil inlet, and the second lubricating oil circuit supplies lubricating oil to the sliding bearing assembly through the second oil inlet, and the recovery oil circuit sends the lubricating oil in the first lubricating oil circuit and the second lubricating oil circuit out of the box body through the oil outlet.

7. The bearing housing according to claim 6, wherein: The first lubricating oil circuit includes an oil inlet pipe, which is passed through and fixed in the bearing gland, and an oil outlet of the oil inlet pipe extends into the housing and is close to the rolling bearing.

8. The bearing housing according to claim 1, wherein: The rolling bearing further comprises an inner ring, the pump shaft sleeve is provided with a shaft sleeve, and the inner ring is interference-connected with the shaft sleeve.

9. The bearing housing according to claim 8, wherein: A pressing sleeve is fixedly provided at the end of the pump shaft, and the pressing sleeve is in axially fitting contact with the inner ring.

10. The bearing box according to any one of claims 1 to 9, characterized in that: The rolling bearing is a three-point contact ball bearing.

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