Double-pump lubricating and cooling system for single-stage centrifugal blower
By eliminating the low-speed shaft of the gear pump through a dual-pump lubrication and cooling system, a compact layout and efficient lubrication and cooling of the single-stage centrifugal blower are achieved. This solves the problems of equipment complexity and oil leakage risk in the prior art, reduces costs, and improves maintenance convenience.
Patent Information
- Application Number
- CN202520332555.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-27
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2035-02-27
AI Technical Summary
In the existing lubrication system of single-stage centrifugal blowers, the external gear pump design is complex, increases equipment costs, poses a high risk of oil leakage, is inconvenient to maintain, and is unsightly.
It adopts a dual-pump lubrication and cooling system, with a gear pump and a permanent magnet synchronous motor directly driven, eliminating the low-speed shaft design. The overall oil circuit layout is compact, with the electric pump installed at the rear of the oil tank. It is equipped with a lubricating oil filter and an oil circuit manifold, and the pipeline layout is optimized.
It simplifies the equipment structure, reduces manufacturing costs, reduces lubricant consumption, improves maintenance convenience and appearance, and enhances cooling and lubrication efficiency.
Smart Images
Figure CN223662146U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of high-speed centrifugal blower cooling technology, and particularly relates to a dual-pump lubrication and cooling system for a single-stage centrifugal blower. Background Technology
[0002] High-speed centrifugal blowers consist of a permanent magnet synchronous motor, a gearbox, and pneumatic components. They are widely used in wastewater treatment, cement, and paper industries due to their high operating speed, high overall efficiency, compact structure, and high power density. The blower's lubrication system reduces bearing friction, removes frictional heat, and reduces wear, which is crucial for the blower's long-term safe operation. Currently, single-stage high-speed centrifugal blowers typically rely on a dual-pump system: a gear pump and an electric pump. The gear pump is the main pump, with its low-speed shaft and coupling external to the gearbox. The electric pump is the auxiliary pump, located on an oil tank base, and its rotation drives the low-speed shaft of the gear pump to circulate the oil. After exiting the gearbox, the lubricating oil enters the radiator. The cooled lubricating oil then returns to the gearbox through a high-precision oil filter to lubricate and cool the bearings.
[0003] Existing single-stage centrifugal blowers typically have gear pumps externally mounted outside the gearbox, operating by a motor driving the gear shaft. This requires an additional low-speed gear pump shaft on top of the input and output shaft transmissions, necessitating lubrication and cooling of this shaft, increasing manufacturing costs and creating a risk of oil leaks at various connections. Furthermore, gear pump installation is complex, hindering maintenance and repair, and the intricate oil piping affects the overall aesthetics of the machine. Utility Model Content
[0004] The purpose of this invention is to provide a dual-pump lubrication and cooling system for a single-stage centrifugal blower. This dual-pump lubrication and cooling system optimizes the overall oil circuit layout, resulting in a more compact installation, easier pipe installation, maintenance, and repair, and a neat and aesthetically pleasing appearance. It eliminates the need for gear pump low-speed shaft transmission, thus reducing the amount of lubricating oil used and lowering overall manufacturing costs. To achieve the above objectives, this invention employs the following technical effects:
[0005] According to one aspect of this utility model, a dual-pump lubrication and cooling system for a single-stage centrifugal blower is provided. The lubrication and cooling system includes a gear pump, an electric pump, a radiator, and an oil tank base for supporting and mounting a permanent magnet synchronous motor and a gearbox. The permanent magnet synchronous motor and the gearbox are respectively mounted on the two end surfaces of the oil tank base. The drive output shaft of the gear pump is connected to the tail interface of the permanent magnet synchronous motor. The electric pump is externally mounted to the tail of the oil tank base via an electric pump mounting bracket. The radiator is located on the side of the oil tank base. The first oil outlet of the oil tank base is connected to the inlet of the gear pump via a first oil suction pipe. The second oil outlet of the oil tank base is connected to the inlet of the electric pump via a second oil suction pipe. The outlet of the gear pump is connected to the inlet of the radiator. The outlet of the radiator is connected to the cooling oil inlet of the permanent magnet synchronous motor via a cooling oil supply pipe. The cooling oil outlet of the permanent magnet synchronous motor is connected to the inlet of the gear speed increaser via a lubrication and cooling pipe. The oil outlet of the gear speed increaser is connected to the return oil port of the oil tank base.
[0006] In a further preferred embodiment of the above scheme, an oil filter is installed on the lubrication and cooling pipe between the heat dissipation oil outlet of the permanent magnet synchronous motor and the inlet end of the gear speed increaser.
[0007] In a further preferred embodiment of the above scheme, an oil passage manifold is provided on the side near the inlet end of the radiator. The outlet end of the gear pump is connected to the first inlet end of the oil passage manifold through a first branch oil pipe, the outlet oil end of the electric pump is connected to the second inlet end of the oil passage manifold through a second branch oil pipe, and the outlet end of the oil passage manifold is connected to the inlet end of the radiator through an oil collection pipe.
[0008] In a further preferred embodiment of the above scheme, the outer walls of the first branch oil pipe and the second branch oil pipe are respectively fixed to the side wall of the oil tank base by corresponding oil pipe clamps.
[0009] In a further preferred embodiment of the above scheme, a sealing end cover for sealing the tail interface is provided at the tail of the permanent magnet synchronous motor, and a gear pump mounting base is provided on the sealing end cover. The outer wall located on the drive output shaft side of the gear pump is connected to the gear pump mounting base.
[0010] In a further preferred embodiment of the above scheme, a gear pump adapter shaft and a coupling are sequentially arranged on the tail interface of the magnetic synchronous motor along the axial direction and fitted inside the gear pump mounting base. The tail interface of the magnetic synchronous motor is connected to the drive output shaft of the gear pump through the gear pump adapter shaft and the coupling.
[0011] In a further preferred embodiment of the above scheme, an oil baffle plate is provided on the inner wall of the gear pump mounting base and on the side near the tail interface of the permanent magnet synchronous motor, which surrounds the circumference of the gear pump transfer shaft.
[0012] In summary, this utility model adopts the above-mentioned technical solution and has the following technical effects: The electric pump in the lubrication and cooling system of this utility model is fixed to the tail of the oil tank through an electric pump mounting bracket, and the gear pump is installed at the tail of the motor through a gear pump adapter shaft, coupling, and gear pump mounting end cover, which optimizes the overall oil circuit layout, makes the whole machine installation more compact, facilitates the installation, maintenance and repair of pipelines, and has a neat and beautiful appearance; the design of the low-speed shaft of the gear pump is eliminated, eliminating the need for gear transmission and reducing the amount of lubricating oil used, thus reducing the overall manufacturing cost; the cooled lubricating oil enters the motor heat dissipation housing to cool the motor and then is filtered back to the gearbox to cool and lubricate the bearings in the gearbox, improving the cooling and lubrication efficiency, and eliminating the need for a separate oil circuit for motor cooling. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the overall structure of a dual-pump lubrication and cooling system for a single-stage centrifugal blower according to the present invention.
[0014] Figure 2 This is a three-dimensional structural diagram of the gear pump assembly of this utility model;
[0015] Figure 3 This is a schematic diagram of the internal structure of the gear pump assembly of this utility model;
[0016] Figure 4 This is a utility model Figure 3 The front view;
[0017] In the attached diagram, 1-Permanent magnet synchronous motor, 2-Gear pump, 3-Electric pump, 4-Electric pump mounting bracket, 5-Oil tank base, 6-Water-cooled radiator, 7-Oil circuit manifold, 8-Gear speed increaser, 9-Lubricating oil filter, 10-Gear pump adapter shaft, 11-Gear pump mounting base, 12-Coupling, 13-Pipe clamp, 20-First oil suction pipe, 21-First branch oil pipe, 22-Oil collection pipe, 30-Second oil suction pipe, 31-Second branch oil pipe, 60-Cooling oil supply pipe, 80-Lubrication and cooling pipe, tail interface 100, sealing end cover 101, and oil baffle 110. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are merely to provide the reader with a thorough understanding of one or more aspects of this utility model, and these aspects can be achieved even without these specific details.
[0019] Combination Figure 1 , Figure 2 and Figure 3 As shown, according to this utility model, a dual-pump lubrication and cooling system for a single-stage centrifugal blower includes a gear pump 2, an electric pump 3, a radiator 6, and an oil tank base 5 for supporting and mounting a permanent magnet synchronous motor 1 and a gearbox 8. The permanent magnet synchronous motor 1 and the gearbox 8 are respectively mounted on the two end surfaces of the oil tank base 5. The drive output shaft of the gear pump 2 is connected to the tail interface of the permanent magnet synchronous motor 1. The electric pump 3 is externally mounted to the tail of the oil tank base 5 via an electric pump mounting bracket 4, thereby optimizing the overall oil pipe layout. The gear pump and electric pump are mounted at the tail of the motor, facilitating the layout of the oil pipes and maintenance. The radiator 6 is located on the side of the oil tank base 5. The first oil outlet of the oil tank base 5 is connected to the inlet end of the gear pump 2 via the first oil suction pipe 20. The second oil outlet of the oil tank base 5 is connected to the inlet end of the electric pump 3 via the second oil suction pipe 30. The outlet end of the gear pump 2 is connected to the inlet end of the radiator 6. The outlet end of the radiator 6 is connected to the cooling oil inlet of the permanent magnet synchronous motor 1 via the cooling oil supply pipe 60. The cooling oil outlet of the permanent magnet synchronous motor 1 is connected to the inlet end of the gear speed increaser 8 via the lubrication cooling pipe 80. The oil outlet of the gear speed increaser 8 is connected to the return oil outlet of the oil tank base 5.
[0020] Combination Figure 1 , Figure 2 and Figure 3 As shown, an oil filter 9 is installed on the lubrication and cooling pipe 80 between the cooling oil outlet of the permanent magnet synchronous motor 1 and the inlet end of the gear speed increaser 8. The lubricating oil from the cooling oil outlet of the permanent magnet synchronous motor 1 is filtered through the lubrication and cooling pipe 80 and the oil filter 9 before being sent into the gear speed increaser 8. An oil passage block 7 is installed on the side near the inlet end of the radiator 6. The outlet end of the gear pump 2 is connected to the first inlet end of the oil passage block 7 through the first branch oil pipe 21. The outlet oil end of the electric pump 3 is connected to the second inlet end of the oil passage block 7 through the second branch oil pipe 31. The outlet end of the oil passage block 7 is connected to the inlet end of the radiator 6 through the oil collection pipe 22. The outer walls of the first branch oil pipe 21 and the second branch oil pipe 31 are respectively fixed to the side wall of the oil tank base 5 by corresponding oil pipe clamps 13. A gear pump mounting base 11 is installed between the gear pump adapter shaft 10 and the coupling 12. In the cooling and lubrication system of this utility model, the gear pump 2 is directly driven by the rotor of the permanent magnet synchronous motor 1, which does not require additional lubricating oil for cooling and lubrication, reduces lubricating oil consumption, lowers the risk of oil leakage at various connections, eliminates the design of the low-speed shaft of the gear pump, eliminates the need for gear transmission, makes the structure simpler, and reduces manufacturing costs.
[0021] In this utility model, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 A sealing end cap 101 is provided at the tail end of the permanent magnet synchronous motor 1 to seal the tail interface 100, thereby sealing the tail interface 100 (output shaft) of the magnetic synchronous motor 1 and preventing oil contamination of the output shaft of the motor 1. A gear pump mounting base 11 is provided on the sealing end cap 100, and the outer wall of the gear pump 2 on the drive output shaft side is connected to the gear pump mounting base 11. A gear pump adapter shaft 10 and a coupling 12 are sequentially arranged on the tail interface 100 of the magnetic synchronous motor 1 along the axial direction and sleeved in the gear pump mounting base 11. The gear pump mounting base 11 covers the sealing tail interface 100, the gear pump adapter shaft 10 and the coupling 12, making them in a sealed space to prevent external oil contamination. To prevent contamination, the tail interface 100 of the magnetic synchronous motor 1 is connected to the drive output shaft of the gear pump 2 via the gear pump adapter shaft 10 and coupling 12. An oil baffle 110 is provided on the inner wall of the gear pump mounting base 11, near the tail interface 100 of the permanent magnet synchronous motor 1, and surrounds the circumference of the gear pump adapter shaft 10. This achieves the purpose of the oil baffle 110 isolating the coupling 12 from the tail interface 100. When the permanent magnet synchronous motor 1 is started, its tail interface (output shaft) rotates accordingly, thereby driving the output shaft of the gear pump 2 to rotate together through the drive gear pump adapter shaft 10 and coupling 12, so that the gear pump 2 can operate and deliver the lubricating oil passing through the gear pump 2 to the oil passage collection block 7.
[0022] In this utility model, combined with Figure 1 and Figure 2The permanent magnet synchronous motor 1 and the gear speed increaser 8 are mounted on the oil tank base 5; the gear pump 2 is mounted on the tail interface of the permanent magnet synchronous motor 1 via the gear pump adapter shaft 10, the gear pump mounting base 11, and the coupling 12; the electric pump 3 is mounted externally on the tail of the oil tank base 5 via the electric pump mounting bracket 4; lubricating oil flows from the oil tank base 5 into the gear pump 2 and the electric pump 3 through the first oil suction pipe 20 and the second oil suction pipe 30 respectively, and then exits from the gear pump 2 and the electric pump 3, and is delivered to the oil passage manifold 7 through the first branch oil pipe 21 and the second branch oil pipe 31 respectively. The first branch oil pipe 21 and the second branch oil pipe 31 are connected by the oil pipe clamp 13 respectively. Fixed to the side of the oil tank base 5; the oil collected by the oil collection block 7 is connected to the water-cooled radiator 6 through the oil collection pipe 22 to complete the cooling of the lubricating oil. The lubricating oil is then transported from the outlet end of the water-cooled radiator 6 to the heat dissipation housing of the permanent magnet synchronous motor 1 through the cooling oil supply pipe 60 to cool the permanent magnet synchronous motor 1. After the lubricating oil completes the heat dissipation and cooling of the permanent magnet synchronous motor 1, it flows out of the permanent magnet synchronous motor 1 and is transported to the lubricating oil filter 9 through the lubrication cooling pipe 80 for filtration. The filtered lubricating oil finally flows back to the gear speed increaser 8 through the return pipe to cool and lubricate the internal bearings and other parts. After cooling and lubrication, the lubricating oil returns to the oil tank base 5 to complete the oil circuit circulation.
[0023] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A dual-pump lubrication and cooling system for a single-stage centrifugal blower, characterized in that: The lubrication and cooling system includes a gear pump, an electric pump, a radiator, and an oil tank base for supporting the permanent magnet synchronous motor and the gear increaser. The permanent magnet synchronous motor and the gear increaser are respectively mounted on the two end surfaces of the oil tank base. The drive output shaft of the gear pump is connected to the tail interface of the permanent magnet synchronous motor. The electric pump is externally mounted to the tail of the oil tank base via an electric pump mounting bracket. The radiator is located on the side of the oil tank base. The first oil outlet of the oil tank base is connected to the inlet end of the gear pump via a first oil suction pipe. The second oil outlet of the oil tank base is connected to the inlet end of the electric pump via a second oil suction pipe. The outlet end of the gear pump is connected to the inlet end of the radiator. The outlet end of the radiator is connected to the cooling oil inlet of the permanent magnet synchronous motor via a cooling oil supply pipe. The cooling oil outlet of the permanent magnet synchronous motor is connected to the inlet end of the gear increaser via a lubrication and cooling pipe. The oil outlet of the gear increaser is connected to the oil return port of the oil tank base.
2. The dual-pump lubrication and cooling system for a single-stage centrifugal blower according to claim 1, characterized in that: An oil filter is installed on the lubrication and cooling pipe between the cooling oil outlet of the permanent magnet synchronous motor and the inlet of the gearbox.
3. The dual-pump lubrication and cooling system for a single-stage centrifugal blower according to claim 1, characterized in that: An oil passage manifold is provided on the side near the inlet end of the radiator. The outlet end of the gear pump is connected to the first inlet end of the oil passage manifold through a first branch oil pipe. The outlet oil end of the electric pump is connected to the second inlet end of the oil passage manifold through a second branch oil pipe. The outlet end of the oil passage manifold is connected to the inlet end of the radiator through an oil collection pipe.
4. A dual-pump lubrication and cooling system for a single-stage centrifugal blower according to claim 3, characterized in that: The outer walls of the first branch oil pipe and the second branch oil pipe are respectively fixed to the side wall of the oil tank base by corresponding oil pipe clamps.
5. A dual-pump lubrication and cooling system for a single-stage centrifugal blower according to claim 1, characterized in that: A sealing end cover for sealing the tail interface is provided at the tail of the permanent magnet synchronous motor. A gear pump mounting base is provided on the sealing end cover. The outer wall located on the drive output shaft side of the gear pump is connected to the gear pump mounting base.
6. A dual-pump lubrication and cooling system for a single-stage centrifugal blower according to claim 5, characterized in that: A gear pump adapter shaft and a coupling are sequentially arranged on the tail interface of the magnetic synchronous motor along the axial direction and fitted inside the gear pump mounting base. The tail interface of the magnetic synchronous motor is connected to the drive output shaft of the gear pump through the gear pump adapter shaft and the coupling.
7. A dual-pump lubrication and cooling system for a single-stage centrifugal blower according to claim 5, characterized in that: An oil baffle plate is provided on the inner wall of the gear pump mounting base, near the tail interface of the permanent magnet synchronous motor, and surrounds the circumference of the gear pump transfer shaft.