CN110778525A

CN110778525A - Bearing lubricating structure and single-stage centrifugal pump with same

Info

Publication number: CN110778525A
Application number: CN201911170901.4A
Authority: CN
Inventors: 王志强
Original assignee: Fox Fluid Control (suzhou) Co Ltd
Current assignee: Fox Fluid Control (suzhou) Co Ltd; Flowserve Fluid Motion and Control Suzhou Co Ltd
Priority date: 2019-11-26
Filing date: 2019-11-26
Publication date: 2020-02-11

Abstract

The invention discloses a bearing lubricating structure and a single-stage centrifugal pump with the same, wherein the bearing lubricating structure comprises a bearing box body with a hollow cavity, a rotating shaft coaxial with the central axis of the bearing box body is arranged in the bearing box body, a first bearing, a second bearing and a third bearing are fixedly arranged on the rotating shaft, the outer sleeves of the first bearing, the second bearing and the third bearing are fixedly connected with the bearing box body, and the second bearing and the third bearing are tightly attached; an oil throwing assembly sleeved on the rotating shaft is further arranged between the first bearing and the second bearing, and oil thrown out by the oil throwing assembly can lubricate the first bearing and the third bearing through a lubricating channel. The invention has the following beneficial effects: the structure enables oil to form a circulation along the bearing box body, the oil throwing assembly, the lubricating channel and the bearing box body. The structure not only strengthens the lubricating effect on the three bearings, but also plays a role in circularly cooling oil, can reduce the temperature of the bearings, prolongs the service life of the bearings, and can be applied to the environment with harsh field conditions.

Description

Bearing lubricating structure and single-stage centrifugal pump with same

Technical Field

The invention relates to pumps, in particular to a bearing lubricating structure and a single-stage centrifugal pump with the same.

Background

The centrifugal pump is used as main power consumption equipment in petrochemical industry, metallurgy and electric power industry, and is widely applied to various fields in national economy. With the increasing requirements on energy conservation and emission reduction, centrifugal pumps are continuously developed towards high performance and low energy consumption.

The centrifugal pump has various forms such as vertical type, horizontal type, single stage, multistage, single suction, double suction, self suction and the like. Centrifugal pumps operate by causing water to move centrifugally as a result of the rotation of an impeller. Before the water pump is started, the pump shell and the water suction pipe are filled with water, then the motor is started, the pump shaft drives the impeller and the water to rotate at a high speed, the water is thrown to the outer edge of the impeller to be thrown into a water pressure pipeline of the water pump through a flow channel of the volute-shaped pump shell.

The bearings in the centrifugal pump bearing assembly are used to support the rotor components and to carry the various loads acting on the rotor components. The main purpose of lubrication is to reduce friction loss, reduce or prevent wear, and also to perform cooling, vibration absorption, rust prevention, and the like. The existing centrifugal pump bearing box is provided with a box body, a bearing is arranged in the box body, a pump shaft is arranged in the bearing, a bearing gland is arranged on the box body outside the bearing, an oil filling hole and an oil level gauge are arranged on the box body, a proper amount of lubricating oil is added into the bearing box through the oil filling hole, when a shaft part rotates, the bearing drives the lubricating oil to rotate, and due to the reasons of the dead weight of the oil and the small centrifugal force, the lubricating area of the bearing is small, the lubricating effect is poor, the lubricating oil only contacts with the small area of the bearing, the cooling effect on the bearing is poor.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a bearing lubricating structure and a single-stage centrifugal pump with the same.

The purpose of the invention is realized by the following technical scheme:

a bearing lubricating structure comprises a bearing box body with a hollow cavity, wherein a rotating shaft coaxial with the central axis of the bearing box body is arranged in the bearing box body, a first bearing, a second bearing and a third bearing are fixedly arranged on the rotating shaft, the outer sleeves of the first bearing, the second bearing and the third bearing are fixedly connected with the bearing box body, and the second bearing and the third bearing are tightly attached; an oil throwing assembly is further arranged between the first bearing and the second bearing and sleeved on the rotating shaft, and oil thrown by the oil throwing assembly can be lubricated by the first bearing and the third bearing through a lubricating channel.

Preferably, the lubrication passage is at least including setting up the first bearing is kept away from get rid of the first trunk line of oil subassembly one side, the one end of first trunk line with well cavity intercommunication.

Preferably, the lubrication passage is still including setting up the third bearing is kept away from get rid of the second trunk line of oil subassembly one side, the one end of second trunk line through first by pass line with well cavity intercommunication, the other end of second trunk line through the second by pass line with well cavity intercommunication.

Preferably, the oil slinger assembly comprises a first oil slinger and a second oil slinger which are fixedly arranged on the rotating shaft, a gap exists between the first oil slinger and the second oil slinger, the first oil slinger can throw oil onto the first bearing, and the second oil slinger can throw oil onto the second bearing.

Preferably, the bearing box body is further provided with an oil inlet and an oil outlet, the oil inlet is located above the oil throwing component, and the oil outlet is located below the oil throwing component.

Preferably, an L-shaped rotating hook is fixedly arranged on the inner wall of the bearing box body, and the rotating hook is communicated with the lubricating channel.

A single-stage centrifugal pump having a bearing lubrication structure, comprising at least the bearing lubrication structure as described above; the pump body and the pump cover are fixedly connected with each other, the impeller is arranged in a space formed by the pump body and the pump cover, and one end of the rotating shaft is fixedly connected with the gravity center of the impeller.

Preferably, the middle end part of the pump body is provided with a suction flange, the top part of the pump body is provided with an outlet flange, the suction flange, the outlet flange, the process pipeline and the impeller form a medium flow channel, and a medium inlet of the impeller faces the suction flange, a medium outlet and the outlet flange are coaxial.

Preferably, the bearing box body is further provided with a heat dissipation rib plate.

Preferably, the pump body and the pump cover are fixedly connected through a connecting bolt.

The invention has the following beneficial effects: the structure is exquisite, and the modern design carries out the lubricated effect of oil bath in oil process lubrication channel flows the bearing through getting rid of the oily subassembly and throws away oily subassembly, and this structure makes oil along bearing box-getting rid of oily subassembly-lubrication channel-bearing box in addition, forms a circulation. The structure not only strengthens the lubricating effect on the three bearings, but also plays a role in circularly cooling oil, can reduce the temperature of the bearings, prolongs the service life of the bearings, and can be applied to the environment with harsh field conditions.

Drawings

The technical scheme of the invention is further explained by combining the accompanying drawings as follows:

FIG. 1: a cross-sectional view of the present invention;

FIG. 2: a partial cross-sectional view a-a in fig. 1;

FIG. 3: a partial cross-sectional view of B-B in fig. 1.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodical, or functional changes that may be made by one of ordinary skill in the art in light of these embodiments are intended to be within the scope of the present invention.

The present invention is not limited to the above embodiments, and structural, methodological, or functional changes made by those skilled in the art according to the embodiments are included in the scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1 to 3, the present invention discloses a bearing lubrication structure, which includes a bearing housing 1 having a hollow cavity 11, a rotating shaft 3 coaxial with a central axis of the rotating shaft 3 is disposed in the bearing housing 1, a first bearing 31, a second bearing 32 and a third bearing 33 are fixedly disposed on the rotating shaft 3, outer sleeves of the first bearing 31, the second bearing 32 and the third bearing 33 are fixedly connected to the bearing housing 1, wherein the second bearing 32 and the third bearing 33 are tightly attached to each other. An oil throwing component 4 sleeved on the rotating shaft 3 is further arranged between the first bearing 31 and the second bearing 32, and oil thrown out by the oil throwing component 4 can lubricate the first bearing 31 and the third bearing 33 through a lubricating channel 5. Above-mentioned structure is exquisite, the modern design, and the oil that throws away the oil subassembly flows the bearing through lubricated passageway and carries out the lubricated effect of oil bath, and this structure makes oil along bearing box-throwing away oil subassembly-lubricated passageway-bearing box in addition, forms a circulation. The structure not only strengthens the lubricating effect on the three bearings, but also plays a role in circularly cooling oil, can reduce the temperature of the bearings, prolongs the service life of the bearings, and can be applied to the environment with harsh field conditions.

In this embodiment, the lubrication passage 5 at least includes a first main pipe 51 disposed on a side of the first bearing 31 away from the oil slinging component 4, and one end of the first main pipe 51 is communicated with the hollow cavity 11. The lubrication passage 5 is further arranged on the third bearing 33 far away from the second main pipeline 52 on one side of the oil throwing component 4, one end of the second main pipeline 52 is communicated with the hollow cavity 11 through a first bypass pipeline 53, and the other end of the second main pipeline 52 is communicated with the hollow cavity 11 through a second bypass pipeline 54.

In the above, the oil slinger assembly 4 comprises the first oil slinger 41 and the second oil slinger 42 which are fixedly arranged on the rotating shaft 3, a gap is formed between the first oil slinger 41 and the second oil slinger 42, the first oil slinger 41 can throw oil onto the first bearing 31, and the second oil slinger 42 can throw oil onto the second bearing 32.

Further, an oil inlet and an oil outlet are further formed in the bearing box body 1, the oil inlet is located above the oil throwing component 4, and the oil outlet is located below the oil throwing component 4. Preferably, the inner wall of the bearing box body 1 is fixedly provided with an L-shaped circulation hook 9, the circulation hook 9 is communicated with the lubricating channel 5, and the circulation hook 9 plays a role in guiding.

During operation, the back that the oil that rotation axis 3 was taken up by first bearing 31, second bearing 32 and third bearing 33 flowed to the oil subassembly of getting rid of along the axial, under the centrifugal force effect, gets rid of the side of bearing box 1, flows extremely along the inner wall lubrication channel 5 has formed a self-lubricating, cooling system, and the lubricated area of bearing is big, lubricated effect is little, and the area of lubricating oil and bearing contact is big, and is good to the cooling effect of bearing, the long service life of bearing to organized the possibility that oil flows along the axial.

The invention also discloses a single-stage centrifugal pump with a bearing lubricating structure, which at least comprises the bearing lubricating structure, a pump body 6 and a pump cover 7 which are fixedly connected with each other, and an impeller 8 arranged in a space 61 formed by the pump body 6 and the pump cover 7, wherein one end of the rotating shaft 3 is fixedly connected with the gravity center of the impeller 8.

The middle end part of the pump body 6 is provided with a suction flange 62, the top part is provided with an outlet flange 63, the suction flange 62, the outlet flange 63, the process pipeline and the impeller form a medium flow passage, and a medium inlet of the impeller faces the suction flange 62, a medium outlet is coaxial with the outlet flange 63. Still be equipped with heat dissipation gusset 13 on the bearing box 1, played the technological effect of cooling, prolonged bearing box 1's life. Preferably, the pump body 6 and the pump cover 7 are fixedly connected through the connecting bolt 64 and connected through the connecting bolt 64, so that the pump body and the pump cover can be conveniently detached, replaced and maintained, and the working efficiency is greatly improved.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. A bearing lubrication structure is characterized in that: the bearing box comprises a bearing box body (1) with a hollow cavity (11), wherein a rotating shaft (3) coaxial with the central axis of the rotating shaft is arranged in the bearing box body (1), a first bearing (31), a second bearing (32) and a third bearing (33) are fixedly arranged on the rotating shaft (3), the outer sleeves of the first bearing (31), the second bearing (32) and the third bearing (33) are fixedly connected with the bearing box body (1), and the second bearing (32) and the third bearing (33) are tightly attached; an oil throwing component (4) sleeved on the rotating shaft (3) is further arranged between the first bearing (31) and the second bearing (32), and oil thrown out by the oil throwing component (4) can lubricate the first bearing (31) and the third bearing (33) through a lubricating channel (5).

2. The bearing lubrication structure according to claim 1, wherein: the lubricating channel (5) is at least arranged on the first bearing (31) far away from a first main pipeline (51) on one side of the oil throwing component (4), and one end of the first main pipeline (51) is communicated with the hollow cavity (11).

3. The bearing lubrication structure according to claim 1, wherein: lubricated passageway (5) are still including setting up third bearing (33) are kept away from get rid of second trunk line (52) of oil subassembly (4) one side, the one end of second trunk line (52) through first by pass line (53) with well cavity (11) intercommunication, the other end of second trunk line (52) through second by pass line (54) with well cavity (11) intercommunication.

4. A bearing lubrication structure according to claim 2 or 3, wherein: the oil slinger assembly (4) comprises a first oil slinger (41) and a second oil slinger (42) which are fixedly arranged on the rotating shaft (3), a gap exists between the first oil slinger (41) and the second oil slinger (42), the first oil slinger (41) can throw oil onto the first bearing (31), and the second oil slinger (42) can throw oil onto the second bearing (32).

5. The bearing lubrication structure according to claim 4, wherein: the bearing box body (1) is further provided with an oil inlet and an oil outlet, the oil inlet is located above the oil throwing component (4), and the oil outlet is located below the oil throwing component (4).

6. The bearing lubrication structure according to claim 1, wherein: the bearing box is characterized in that an L-shaped rotating hook (9) is fixedly arranged on the inner wall of the bearing box body (1), and the rotating hook (9) is communicated with the lubricating channel (5).

7. A single-stage centrifugal pump with a bearing lubricating structure is characterized in that: comprising at least a bearing lubrication structure as claimed in any one of claims 1 to 6; the pump is characterized by further comprising a pump body (6) and a pump cover (7) which are fixedly connected with each other, and an impeller (8) arranged in a space (61) formed by the pump body (6) and the pump cover (7), wherein one end of the rotating shaft (3) is fixedly connected with the gravity center of the impeller (8).

8. The single-stage centrifugal pump with a bearing lubricating structure according to claim 7, characterized in that: the middle end part of the pump body (6) is provided with a suction flange (62), the top part of the pump body is provided with an outlet flange (63), the suction flange (62), the outlet flange (63), a process pipeline and the impeller form a medium flow channel, and a medium inlet of the impeller faces the suction flange (62), a medium outlet and the outlet flange (63) are coaxial.

9. The single-stage centrifugal pump with a bearing lubricating structure according to claim 8, characterized in that: and the bearing box body (1) is also provided with a heat dissipation rib plate (13).

10. The single-stage centrifugal pump with a bearing lubricating structure according to claim 9, characterized in that: the pump body (6) and the pump cover (7) are fixedly connected through a connecting bolt (64).