Guide bearing structure of underwater working pump body

Abstract

The invention relates to the technical field of submersible pumps, and provides a guide bearing structure of an underwater working pump body, which comprises a bearing seat, a supporting seat, a shaft bushing and a plane bearing, the bearing seat is fixedly arranged on a guide vane body, the supporting seat is fixedly arranged at one end of the bearing seat, the shaft bushing is arranged at the other end for supporting a transmission shaft, and a sealing cavity is formed between the supporting seat and the shaft bushing; and the plane bearing is fixedly arranged on the shaft bushing and is opposite to the gasket. By optimizing the guide bearing structure, stable supporting of the transmission shaft, effective counteracting of axial movement and good lubricating and sealing performance are achieved, the stability and durability of the submersible pump during high-speed operation are improved, and the submersible pump is compact in structure and efficient.

Description

Technical Field

[0001] The invention belongs to the technical field of submersible pumps, and in particular relates to a guide bearing structure of an underwater working pump body. Background Art

[0002] In pumps working in water, such as submersible pumps and deep well pumps, guide vanes and guide bearings are two crucial components. Guide vanes are usually fixedly mounted on the casing of submersible pumps. Their main function is to collect and guide the high-speed liquid thrown out of the impeller. Through the special design of the guide vanes, part of the velocity energy head of the liquid can be effectively converted into pressure energy head, ensuring that the liquid can flow smoothly to the next stage or be discharged smoothly out of the pump. The guide bearings of the submersible pump are installed at both ends of the transmission shaft or in specific positions (such as in the hub of the guide vane body). The main functions of the guide bearings include supporting the impeller transmission, transmitting the rotation speed, bearing the radial force of the rotating part of the water pump, and stabilizing the rotation of the impeller.

[0003] For example, Chinese utility patent application No. 202322963305X discloses a multi-stage centrifugal pump guide body support structure and a multi-stage centrifugal pump, wherein a guide vane is arranged in the guide body, a pump shaft support sleeve is fixedly installed in the middle of the guide vane, and the guide body is arranged as a guide body that shares a central axis with the support sleeve. A guide vane is arranged in the guide body, and during the liquid lifting process, the liquid circulates through the guide vane's guide flow, and a support sleeve fixedly installed in the middle of the guide vane to support the pump shaft is arranged, and during the rotation of the pump shaft, radial support is provided through the support sleeve to improve the radial support strength of the pump shaft.

[0004] However, in actual applications, the drive shaft of the submersible pump will be affected by many factors during the rotation process. In addition to the radial pressure generated by the impeller causing radial swing, objective factors such as assembly errors, self-test errors, and the impact of working water flow in the water will also cause eccentric rotation between the drive shaft and the motor shaft. This eccentricity will not only affect the stability of the drive shaft, but may also cause serious axial movement of the drive shaft and its components, and even hit the shaft seat, causing serious mechanical damage and performance degradation. Summary of the invention

[0005] The purpose of the present invention is to address the above-mentioned problems in the existing technology and to propose a guide bearing structure for an underwater working pump body. By optimizing the structural design of the guide bearing, stable support of the transmission shaft, effective offset of axial movement, and good lubrication and sealing performance are achieved, thereby improving the stability and durability of the submersible pump when running at high speed.

[0006] The objectives of the present invention can be achieved through the following technical solutions: a guide bearing structure of an underwater working pump body, wherein the guide vane body is fixedly mounted on the pump body shell, and a transmission shaft is arranged inside the pump body shell, including a bearing seat, a support seat, a shaft bushing and a plane bearing. The bearing seat is fixedly mounted on the guide vane body and is hollow cylindrical. The support seat is fixedly mounted on an opening at one end of the bearing seat. A sliding bearing that slides with the shaft bushing is installed in the bearing seat. The shaft bushing is installed on the opening at the other end of the bearing seat to support and protect the transmission shaft. A sealing cavity is formed between the support seat and the shaft bushing, and a gasket is fixedly mounted in the sealing cavity. The plane bearing is fixedly mounted on the shaft bushing and is arranged opposite to the gasket with clearance between the two.

[0007] Preferably, the material density of the gasket is greater than the material density of the plane bearing.

[0008] Preferably, the gasket is made of tungsten steel, and the plane bearing is made of composite ceramic material.

[0009] Preferably, a plurality of lubrication grooves opposite to the gasket are circumferentially provided on the outer surface of the plane bearing, and the lubrication grooves can connect with the sealing cavities on both sides thereof.

[0010] Preferably, the shaft bushing comprises an outer bushing and an inner spline bushing embedded in the outer bushing and tightly matched with the transmission shaft, and the outer bushing is embedded with an elastic spline rubber bushing that tightly matches with the transmission shaft.

[0011] Preferably, a protruding annular hoop is formed on the inner spline bushing, and the plane bearing is embedded in the hoop.

[0012] Preferably, the support seat is made of polymer elastic material, and the end of the transmission shaft is inserted into the support seat and fits tightly therewith. A constant pressure groove is provided on the end face of the support seat that is connected to the transmission shaft. The constant pressure groove is in an expanded shape that gradually expands from the inside to the outside and is arranged to fit the circumferential surface of the transmission shaft.

[0013] Preferably, the sealing cavity is connected to one side of the sliding bearing, and an oil seal is provided on the other side of the sliding bearing.

[0014] Preferably, the bearing seat is made of a metal material with good thermal conductivity, specifically copper and its alloys, aluminum and its alloys, stainless steel, nickel-chromium alloys or titanium and its alloys.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] By optimizing the structure of the guide bearing, stable support for the drive shaft is achieved, axial movement is effectively offset, and the stability and durability of the submersible pump at high speed operation are improved; the lubricant in the sealing chamber can continuously replenish the gap between the gasket and the plane bearing, and the support seat and oil seal ensure the complete sealing of the sealing chamber to prevent the entry of foreign matter such as mud and sand; the material selection of the plane friction pair is optimized to improve wear resistance and impact absorption capacity, and the bearing seat is made of metal material with good thermal conductivity, which is conducive to the heat dissipation of the submersible pump and improves work efficiency and life; it has good buffering and vibration reduction effects, compact and efficient structure, reduces mechanical noise, and improves the overall operation stability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an axonometric diagram of the overall structure of the present invention.

[0018] Figure 2 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 3 It is a schematic diagram of the overall cross-sectional structure of the present invention.

[0020] Figure 4 yes Figure 3 A is an enlarged schematic diagram of the structure.

[0021] Figure 5 It is a schematic diagram of the assembly structure of the shaft bushing and the plane bearing.

[0022] Figure 6 It is a schematic diagram of the support seat structure.

[0023] In the figure, 1. pump body shell; 2. guide vane body; 3. transmission shaft; 4. bearing seat; 41. sealing chamber; 5. support seat; 51. constant pressure groove; 52. sealing strip; 53. step; 6. shaft bushing; 61. outer bushing; 62. inner spline bushing; 621. hoop; 63. spline rubber bushing; 7. sliding bearing; 71. oil seal; 8. gasket; 9. plane bearing; 91. lubrication groove. DETAILED DESCRIPTION

[0024] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0025] Embodiment 1

[0026] like Figure 1-Figure 4As shown, this embodiment provides a guide bearing structure of a submerged working pump body, wherein the guide vane body 2 is fixedly mounted on the pump body shell 1, and a transmission shaft 3 is arranged in the pump body shell 1, including a bearing seat 4, a support seat 5, a shaft bushing 6 and a plane bearing 9, wherein the bearing seat 4 is fixedly mounted on the guide vane body 2 and is in a hollow cylindrical shape, and the support seat 5 is fixedly mounted on an opening at one end of the bearing seat 4, and a sliding bearing 7 that slides with the shaft bushing 6 is installed in the bearing seat 4, and the shaft bushing 6 is installed on the opening at the other end of the bearing seat 4 for supporting and protecting the transmission shaft 3, and a sealing cavity 41 is formed between the support seat 5 and the shaft bushing 6, and the sealing cavity 41 is used to fill a lubricant, and a gasket 8 is fixedly mounted in the sealing cavity 41, and the plane bearing 9 is fixedly mounted on the shaft bushing 6 and is arranged opposite to the gasket 8 with clearance between the two.

[0027] The working principle of this embodiment is as follows: when the transmission shaft 3 rotates eccentrically, due to the action of the unbalanced force, the transmission shaft 3 will move axially and drive the plane bearing 9 to approach the gasket 8. By fixing the gasket 8 in the sealing cavity 41, a plane friction pair is formed between the gasket 8 and the plane bearing 9. The rotation of the transmission shaft 3 drives the plane bearing 9 to rotate synchronously. The friction resistance formed between the two contact surfaces of the gasket 8 and the plane bearing 9 effectively offsets or balances the impact caused by the axial movement, thereby maintaining the stable operation of the pump body.

[0028] At the same time, the shaft bushing 6 and the sliding bearing 7 slide together and block one end opening of the sealing cavity 41, and work together with the support seat 5 to form a sealed sealing cavity 41. The shaft bushing 6 is used as a wearing part to support and protect the transmission shaft 3 to prevent the transmission shaft 3 from rapid wear due to relative movement with other transmission parts. Its design is convenient for replacement when it is worn to a certain extent. Compared with replacing the entire shaft or seat, the cost of replacing the shaft bushing 6 is lower and easier to achieve. The shaft bushing 6 can also balance part of the impact caused by the axial movement of the transmission shaft 3 due to eccentric rotation. The sliding bearing 7 is used to balance the radial swing of the transmission shaft 3 caused by the radial pressure generated by the operation of the impeller.

[0029] The lubricant in the sealing cavity 41 can continuously replenish the gap between the gasket 8 and the plane bearing 9 to form a lubricating film. This lubricating film can not only reduce the friction coefficient and reduce wear, but also avoid direct contact between the gasket 8 and the plane bearing 9, further extending the service life of the components.

[0030] In summary, this embodiment achieves stable support of the transmission shaft, effective offset of axial movement, and good lubrication and sealing performance by optimizing the structural design of the guide bearing, thereby improving the stability and durability of the submersible pump at high speed operation.

[0031] Furthermore, the material density of the gasket 8 is greater than the material density of the plane bearing 9 .

[0032] Since the gasket 8 is fixed in the sealing cavity 41 and is a passive part, and the plane bearing 9 rotates with the transmission shaft 3 and is an active part, the gasket 8, as a passive part, plays a role in supporting and bearing friction in the plane friction pair. By selecting a material with a higher density, the hardness and wear resistance of the gasket 8 can be increased, thereby extending its service life. At the same time, low material density means light weight, which helps to reduce the inertial force during rotation, thereby effectively reducing the impact force caused by axial movement.

[0033] Furthermore, the gasket 8 is made of tungsten steel, and the plane bearing 9 is made of composite ceramic material.

[0034] The high density of tungsten steel also helps to improve the wear resistance and impact absorption capacity of the gasket 8. The composite ceramic material has the characteristics of light weight, high strength, high hardness and good wear resistance. Although its density is lower than that of tungsten steel, in this application, the plane bearing 9 is used as an active part. Its light weight not only helps to reduce the inertia force during rotation, but also reduces the impact on the gasket 8.

[0035] Embodiment 2

[0036] like Figure 4 , Figure 5 As shown, the outer surface of the plane bearing 9 is circumferentially provided with a plurality of lubrication grooves 91 opposite to the gasket 8 , and the lubrication grooves 91 can be connected to the sealing cavities 41 on both sides thereof.

[0037] The lubrication groove 91 can form a storage space for lubricant on the sliding surface, increase the storage capacity of lubricant oil, ensure sufficient lubricant supply during the sliding process, and effectively alleviate the vibration caused by friction. At the same time, the lubrication groove 91 can connect the sealing cavity 41 on both sides thereof, so that the lubricant in the sealing cavity 41 can pass smoothly from both sides thereof and flow to the parts that need lubrication in a dynamic manner.

[0038] Furthermore, the shaft bushing 6 includes an outer bushing 61 and an inner spline bushing 62 embedded in the outer bushing 61 and tightly matched with the transmission shaft 3 . The outer bushing 61 is embedded with a spline rubber bushing 63 that tightly matches with the transmission shaft 3 and has elasticity.

[0039] The spline rubber bushing 63 is elastic and can provide flexible support for the transmission shaft 3 in the radial direction, thereby limiting the radial swing of the transmission shaft 3 and buffering vibration. The shaft bushing 6 achieves stable support and buffering protection for the transmission shaft 3 through the synergistic effect of the outer bushing 61, the inner spline bushing 62 and the spline rubber bushing 63.

[0040] Furthermore, a protruding and annular hoop 621 is formed on the inner spline bushing 62 , and the plane bearing 9 is embedded on the hoop 621 .

[0041] The arrangement of the hoop 621 ensures that no excessive shaking or vibration occurs when the plane bearing 9 and the gasket 8 are frictionally matched, thereby improving stability.

[0042] Embodiment 3

[0043] like Figure 4 , Figure 6 As shown, in this embodiment, the support seat 5 is made of a polymer elastic material, and the end of the transmission shaft 3 is inserted into the support seat 5 and tightly fits therewith. A constant pressure groove 51 is provided on the end face of the support seat 5 that is connected to the transmission shaft 3. The constant pressure groove 51 is in an expanded shape that gradually expands from the inside to the outside and is arranged to fit the circumference of the transmission shaft 3.

[0044] The support seat 5 is made of a polymer elastic material, such as rubber, and has excellent elastic deformation ability. When an external force acts on the support seat 5, it can store energy by deformation, and quickly return to its original state after the external force disappears, thereby effectively absorbing the vibration of the end of the transmission shaft 3, having the effect of buffering the transmission shaft 3 and reducing mechanical noise, and improving the overall operation stability of the equipment. The flared design of the constant pressure groove 51 not only allows the lubricant in the sealing cavity 41 to be smoothly introduced into the gap between the transmission shaft 3 and the support seat 5, forming an effective lubricating layer, reducing the friction coefficient between the two, reducing wear and extending the service life, but also helps to gather the gas inside the sealing cavity 41. When the temperature rises, the internal air pressure of the sealing cavity 41 rises accordingly, and the gas gathers in the constant pressure groove 51, which tends to cause the support seat 5 to undergo elastic deformation. When the internal pressure of the sealing cavity 41 drops, the support seat 5 returns to its original state, which is used to improve its ability to balance the internal and external pressure difference, and prevent problems such as lubricant leakage or sealing failure caused by excessive pressure difference.

[0045] Furthermore, the support seat 5 is circumferentially provided with a sealing strip 52 in an annular shape that can fit tightly with the inner wall of the bearing seat 4 , and the end of the support seat 5 is circumferentially provided with a step 53 that can abut against the inner wall of the bearing seat 4 .

[0046] The sealing strip 52 is annular in shape and can fit tightly against the inner wall of the bearing seat 4, ensuring the sealing of the sealing cavity 41 and effectively preventing the infiltration of external mud, sand, impurities or liquids. The sealing strip 52 ensures the sealing of the sealing cavity 41, and the step 53 can abut against the inner wall of the bearing seat 4, making the support seat 5 more stable when installed on the bearing seat 4 and less likely to loosen or move, thereby simplifying the installation process and reducing the difficulty of assembly.

[0047] Furthermore, the sealing cavity 41 is connected to one side of the sliding bearing 7 , and an oil seal 71 is provided on the other side of the sliding bearing 7 .

[0048] The close connection design between the sealing cavity 41 and the sliding bearing 7 allows the lubricant to fully penetrate into the sliding mating surface between the sliding bearing 7 and the shaft bushing 6 to form an effective lubricating film, significantly reduce friction resistance, and extend the service life of the sliding bearing 7 and the shaft bushing 6.

[0049] The use of the oil seal 71 ensures the complete sealing of the sealing chamber 41, effectively blocks impurities such as mud, water, etc. in the external environment from entering the sealing chamber 41, protects the lubricant from contamination, and maintains the cleanliness and efficient operation of the lubrication system.

[0050] This embodiment further optimizes the sealing and lubrication system in the mechanical transmission device, especially in terms of the coordination and lubrication of the support seat 5, the transmission shaft 3, the sliding bearing 7 and the surrounding structures.

[0051] Furthermore, the bearing seat 4 is made of a metal material with good thermal conductivity, specifically copper and its alloys, aluminum and its alloys, stainless steel, nickel-chromium alloy or titanium and its alloys.

[0052] Submersible pumps are usually installed underwater or in humid environments. This environment limits the choice of heat dissipation methods (such as air cooling). When the submersible pump is working, friction and collision will occur between the guide vane body 2 and the water flow, thereby generating additional heat. The motor part will also generate a large amount of heat. If this heat cannot be dissipated in time, it will cause the temperature of the motor and related transmission components to rise, thereby affecting the working efficiency and life of the water pump.

[0053] Copper and its alloys have excellent thermal conductivity, which can effectively help submersible pumps dissipate heat. Copper also has good toughness and plasticity, so that copper submersible pump parts can maintain good performance and stability during manufacturing and use. Although the thermal conductivity of aluminum and its alloys is not as good as that of copper, its thermal conductivity is still better than that of other metal materials. At the same time, aluminum and its alloys have the advantages of low density, light weight, high strength, and good corrosion resistance, which makes aluminum and its alloy submersible pumps have advantages in cost performance, especially in some occasions with requirements on weight and cost. Aluminum and its alloy submersible pumps are more suitable. Although the thermal conductivity of stainless steel is not as good as that of copper and aluminum, in some occasions where corrosion resistance and thermal conductivity need to be considered at the same time, stainless steel is still a suitable choice in submersible pumps or deep well pumps. Nickel-chromium alloys and titanium alloys are known for their excellent high temperature resistance and corrosion resistance. In high temperature environments or when corrosive media need to be withstood, the use of nickel-chromium alloys, titanium and their alloys is a suitable choice. However, in submersible pumps or deep well pumps, due to their high cost, the application of nickel-chromium alloys and titanium and their alloys is relatively small.

[0054] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A guide bearing structure for an underwater working pump body, wherein a guide vane body (2) is fixedly mounted on a pump body shell (1), and a transmission shaft (3) is arranged inside the pump body shell (1), characterized in that: The invention comprises a bearing seat (4), a support seat (5), a shaft bushing (6) and a plane bearing (9); the bearing seat (4) is fixedly mounted on the guide vane body (2) and is in the shape of a hollow cylinder; the support seat (5) is fixedly mounted on an opening at one end of the bearing seat (4); a sliding bearing (7) which is slidably matched with the shaft bushing (6) is installed in the bearing seat (4); the shaft bushing (6) is installed on the opening at the other end of the bearing seat (4); a sealing cavity (41) is formed between the support seat (5) and the shaft bushing (6); a gasket (8) is fixedly mounted in the sealing cavity (41); and the plane bearing (9) is fixedly mounted on the shaft bushing (6) and is arranged opposite to the gasket (8) and the two are clearance-matched.

2. The guide bearing structure of a submerged working pump body according to claim 1, characterized in that: The material density of the gasket (8) is greater than the material density of the plane bearing (9).

3. The guide bearing structure of a submersible working pump body according to claim 2, characterized in that: The gasket (8) is made of tungsten steel, and the plane bearing (9) is made of composite ceramic material.

4. A guide bearing structure for an underwater working pump body according to claim 1 or 2, characterized in that: The outer surface of the plane bearing (9) is circumferentially provided with a plurality of lubrication grooves (91) opposite to the gasket (8), and the lubrication grooves (91) can be connected to the sealing cavities (41) on both sides thereof.

5. The guide bearing structure of a submerged working pump body according to claim 4, characterized in that: The shaft bushing (6) comprises an outer bushing (61) and an inner spline bushing (62) embedded in the outer bushing (61) and tightly matched with the transmission shaft (3); the outer bushing (61) is embedded with a spline rubber bushing (63) that tightly matches with the transmission shaft (3) and has elasticity.

6. The guide bearing structure of a submersible working pump body according to claim 5, characterized in that: A protruding annular hoop platform (621) is formed on the inner spline bushing (62), and the plane bearing (9) is embedded in the hoop platform (621).

7. The guide bearing structure of a submerged working pump body according to claim 1, characterized in that: The support seat (5) is made of a polymer elastic material. The end of the transmission shaft (3) is inserted into the support seat (5) and tightly matched therewith. A constant pressure groove (51) is provided on the end surface of the support seat (5) that is in contact with the transmission shaft (3). The constant pressure groove (51) is in an expanded shape that gradually expands from the inside to the outside and is arranged to fit the circumference of the transmission shaft (3).

8. The guide bearing structure of a submersible working pump body according to claim 7, characterized in that: The support seat (5) is provided with a sealing strip (52) in an annular shape which can fit tightly against the inner wall of the bearing seat (4) in the circumferential direction, and a step (53) which can abut against the inner wall of the bearing seat (4) is provided at the end of the support seat (5) in the circumferential direction.

9. A guide bearing structure for an underwater working pump body according to claim 1 or 7, characterized in that: The sealing cavity (41) is connected to one side of the sliding bearing (7), and an oil seal (71) is provided on the other side of the sliding bearing (7).

10. The guide bearing structure of a submerged working pump body according to claim 1, characterized in that: The bearing seat (4) is made of a metal material with good thermal conductivity, specifically copper and its alloys, aluminum and its alloys, stainless steel, nickel-chromium alloys or titanium and its alloys.

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