Twin-screw pump with magnetic oil seal bearing housing
By introducing a magnetic oil seal bearing housing into the twin-screw pump, the problems of poor heat dissipation and lubrication of the drive end bearing housing are solved, achieving high-efficiency sealing and anti-interference capabilities, and extending bearing life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANGZHOU XINGLONG PUMP
- Filing Date
- 2025-06-13
- Publication Date
- 2026-05-26
AI Technical Summary
Traditional twin-screw pumps have poor heat dissipation and lubrication in the drive end bearing housing, and the lip seal method is prone to shaft wear.
The bearing housing adopts a magnetic oil seal. By installing mechanical seals in the bearing housings at both the drive end and the gear end, and using a magnetic oil seal consisting of a stationary ring and a moving ring, a sealing effect with strong oil lubrication and anti-interference capabilities is achieved.
It improves the lifespan of the twin-screw pump bearings, avoids shaft wear, achieves a zero-leakage sealing effect, and adapts to various working environments.
Smart Images
Figure CN224282912U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of twin-screw pump technology, specifically a twin-screw pump with a magnetic oil seal bearing housing. Background Technology
[0002] A twin-screw pump consists of a sealed chamber with a constant volume formed between a screw sleeve meshing on the main and driven shafts and the pump body or bushing. The medium is delivered separately to the middle of the pump body as the screw shafts rotate, and the two are combined and finally delivered to the pump outlet, thus achieving the purpose of pumping.
[0003] Traditional twin-screw pumps only achieve oil lubrication at the gear end, while the drive end bearing housing is usually grease lubricated. Therefore, the sealing structure of the drive end bearing housing is simple, resulting in poor heat dissipation and lubrication.
[0004] Traditional lip seals avoid wear on the shaft, preventing irreparable groove-like scratches.
[0005] Therefore, a twin-screw pump with a magnetic oil seal bearing housing is proposed to solve the problems mentioned above. Utility Model Content
[0006] To address the shortcomings of existing technologies, this utility model provides a twin-screw pump with a magnetic oil seal bearing housing, which can solve the problems of poor heat dissipation, poor lubrication, and shaft wear.
[0007] To achieve the above objectives, the present invention provides the following technical solution: including a pump body, and a drive shaft and a driven shaft disposed inside the pump body, wherein the drive shaft and the driven shaft are both equipped with or integrally formed with left-hand and right-hand spiral sleeve assemblies, and the two sets of spiral sleeve assemblies are in a mutually meshing state;
[0008] The pump body is connected to a drive end bearing housing and a gear end bearing housing by several double-headed bolt assemblies. Both the drive end bearing housing and the gear end bearing housing are equipped with mechanical seals. The drive end bearing housing, the gear end bearing housing, the drive shaft, the driven shaft, and the mechanical seals complete the shaft seal with the conveyed medium.
[0009] The pump body is equipped with a magnetic oil seal for oil-lubricated or grease-lubricated shaft seal requirements. The magnetic oil seal consists of a stationary ring assembly and a rotating ring assembly.
[0010] Preferably, the drive shaft, the driven shaft, and the helical sleeve assembly form the core component of the twin-screw pump—the helical sleeve assembly.
[0011] Preferably, the outer circumference of the spiral sleeve assembly is meshed with a bushing, and the bushing and the spiral sleeve assembly form a sealed cavity that is closed to each other.
[0012] Preferably, a synchronous gear assembly with transmission support is provided between the drive shaft and the driven shaft, and the synchronous gear assembly achieves the transmission that causes the drive shaft and the driven shaft to rotate in opposite directions.
[0013] Preferably, the pump body is provided with an inlet and an outlet, and the inlet is connected to the low-pressure chamber of the twin-screw pump, and the low-pressure chamber is connected to the outlet.
[0014] Preferably, the inner hole of the pump body fits with the outer circle of the bushing, the outer circle of the bushing is provided with a plurality of sealing ring grooves, and the high-pressure chamber and the low-pressure chamber of the pump body are provided with O-rings for isolation and support.
[0015] Preferably, the pump body is an externally mounted twin-screw pump, and the bearing consists of a gear end bearing and a drive end bearing. The gear end bearing, the drive end bearing, and the magnetic oil seal are used in combination.
[0016] Preferably, the drive end bearing is provided with an outer bearing cover and an inner bearing cover for axial positioning on one side, and the outer bearing cover, the inner bearing cover, and the drive end bearing are all fixedly installed in the drive end bearing housing. The drive end bearing housing is connected to a bearing housing cover by screws, and the outer bearing cover, the bearing housing cover, and the portion through which the shaft passes form a sealed state with the magnetic oil seal.
[0017] Preferably, the gear end bearing is installed on the outside of the gear end bearing housing, the gear end bearing housing is connected to a gearbox cover by bolts, and the bearing outer pressure cover is fixedly installed on one side of the gear end bearing.
[0018] Preferably, the stationary ring assembly includes a stationary ring, a stationary ring seat, and a stationary ring sealing ring, wherein the stationary ring is embedded in the stationary ring seat, and the stationary ring sealing ring is installed in a groove of the stationary ring seat;
[0019] Preferably, the rotating ring assembly includes a rotating ring seal, a rotating ring seat, a rotating ring, and a magnetic insert, wherein the magnetic insert is embedded in the rotating ring seat, and the rotating ring seal and the shaft are sealed by an interference fit.
[0020] Compared with the prior art, this utility model provides a twin-screw pump with a magnetic oil seal bearing housing, which has the following advantages:
[0021] 1. Both the drive-end bearing housing and the gear-end bearing housing of the twin-screw pump can achieve oil lubrication. Traditional twin-screw pumps only achieve oil lubrication at the gear end, while the drive-end bearing housing usually uses grease lubrication. Therefore, the sealing structure of the drive-end bearing housing is simple, and the heat dissipation and lubrication effects are poor. By setting the drive-end bearing housing to achieve oil lubrication, the life of the twin-screw pump bearings will be greatly improved.
[0022] 2. The bearing cavity seals in the drive end bearing housing and gear end bearing housing of the twin-screw pump adopt magnetic seals. First, compared with the traditional lip seal method, it avoids the wear on the shaft caused by the lip seal, which can result in irreparable groove-like scratches on the shaft. The magnetic seal achieves sealing with the housing and shaft through the sealing ring, and further sealing through its own dynamic and stationary rings, without damaging the shaft. Second, the magnetic seal can be designed as a split structure, which allows for repairs without disassembling the bearing or mechanical seal.
[0023] 3. Magnetic oil seals have strong anti-interference capabilities, which can eliminate wear and scratches on the shaft surface, achieve zero leakage, and adapt to various working environments.
[0024] 4. The magnetic oil seal adopts a fully floating sealing surface structure, which can maintain tight contact and achieve effective sealing even under large shaft runout. Attached Figure Description
[0025] Figure 1 This is a schematic cross-sectional view of the overall structure of this utility model;
[0026] Figure 2 This is a schematic diagram of the overall structure of the magnetic oil seal of this utility model;
[0027] Figure 3 This is a schematic diagram of the drive shaft structure of this utility model;
[0028] Figure 4 This is a schematic diagram of the gear end bearing housing structure of this utility model.
[0029] In the diagram: 1. Pump body; 2. Bushing; 3. Drive end bearing housing; 4. Bearing outer cover; 5. Bearing inner cover; 6. Bearing housing cover; 7. Magnetic oil seal; 71. Dynamic ring seal; 72. Dynamic ring seat; 73. Dynamic ring; 74. Magnetic insert; 75. Stationary ring; 76. Stationary ring seat; 77. Stationary ring seal; 8. Drive shaft; 9. Drive end bearing; 10. Driven shaft; 11. Mechanical seal; 12. Double-ended bolt assembly; 13. Spiral sleeve assembly; 14. Synchronous gear assembly; 15. Gear end bearing; 16. Gearbox cover; 17. Gear end bearing housing. Detailed Implementation
[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0031] Example:
[0032] Please see Figure 1 - Figure 4 The twin-screw pump with magnetic oil seal bearing housing in this embodiment includes a pump body 1, and a drive shaft 8 and a driven shaft 10 disposed inside the pump body 1. The drive shaft 8 and the driven shaft 10 are both equipped with or integrally formed with left-hand and right-hand spiral sleeve assemblies 13, and the two sets of spiral sleeve assemblies 13 are in a mutually meshing state.
[0033] The pump body 1 is connected to a drive end bearing seat 3 and a gear end bearing seat 17 by several double-headed bolt assemblies 12. Both the drive end bearing seat 3 and the gear end bearing seat 17 are equipped with mechanical seals 11. The drive end bearing seat 3, the gear end bearing seat 17, the drive shaft 8, the driven shaft 10 and the mechanical seal 11 complete the shaft seal with the conveyed medium.
[0034] The pump body 1 is equipped with a magnetic oil seal 7 for oil-lubricated or grease-lubricated shaft seal requirements. The magnetic oil seal 7 is composed of a stationary ring assembly and a rotating ring assembly.
[0035] Among them, the drive end bearing housing 3 and gear end bearing housing 17 of the twin screw pump can both achieve oil lubrication. Compared with the traditional twin screw pump, which only achieves oil lubrication at the gear end and usually uses grease lubrication at the drive end bearing housing, the sealing structure of the drive end bearing housing is simple and the heat dissipation and lubrication effects are poor. Therefore, the life of the twin screw pump bearing can be greatly improved by achieving oil lubrication at the drive end bearing housing.
[0036] The bearing cavity seals in the drive end bearing housing 3 and gear end bearing housing 17 of the twin screw pump adopt magnetic seals. First, compared with the traditional lip seal method, it avoids the wear of the shaft caused by the lip seal, which would cause irreparable groove-like scratches on the shaft. The magnetic seal achieves sealing with the housing and shaft through the sealing ring, and then through its own dynamic ring and stationary ring, without causing damage to the shaft. Second, the magnetic seal can be used as a split structure, so that repairs can be completed without disassembling the bearing or mechanical seal.
[0037] The drive shaft 8, the driven shaft 10, and the spiral sleeve assembly 13 form the core component of the twin-screw pump—the spiral sleeve assembly;
[0038] The outer circumference of the spiral sleeve assembly 13 is meshed with the bushing 2, and the bushing 2 and the spiral sleeve assembly 13 form a sealed cavity that is closed to each other.
[0039] A synchronous gear assembly 14 for transmission support is provided between the drive shaft 8 and the driven shaft 10, and the synchronous gear assembly 14 achieves the transmission that causes the drive shaft 8 and the driven shaft 10 to rotate in opposite directions.
[0040] The pump body 1 is provided with an inlet and an outlet, and the inlet is connected to the low-pressure chamber of the twin screw pump, and the low-pressure chamber is connected to the outlet.
[0041] The inner hole of the pump body 1 fits with the outer circle of the bushing 2. The outer circle of the bushing 2 is provided with a number of sealing ring grooves, and the high pressure chamber and low pressure chamber of the pump body 1 are provided with O-rings for isolation and support.
[0042] The drive shaft 8 is equipped with or integrally formed with a helical sleeve assembly 13 having left-hand and right-hand rotation, and the driven shaft 10 is equipped with or integrally formed with a helical sleeve assembly 13 having left-hand and right-hand rotation. The helical sleeve assemblies mesh with each other to form the core component of the twin screw pump - the helical sleeve assembly.
[0043] When the drive shaft 8 rotates, the driven shaft 10 is driven by the synchronous gear assembly 14 to rotate in the opposite direction. The sealing cavity is gradually pressurized from the low pressure end to the high pressure end, thus completing the pumping of the conveyed material.
[0044] The pump body 1 has an inlet and an outlet. The medium at the inlet is drawn into the low-pressure chamber of the twin screw pump and is pressurized and discharged to the outlet of the pump body.
[0045] The pump body 1 is a twin-screw pump with external bearings. The bearings consist of a gear end bearing 15 and a drive end bearing 9. The gear end bearing 15, the drive end bearing 9, and the magnetic oil seal 7 are used in combination.
[0046] The drive end bearing 9 is provided with an outer bearing cover 4 and an inner bearing cover 5 for axial positioning on one side. The outer bearing cover 4, the inner bearing cover 5, and the drive end bearing 9 are all fixedly installed in the drive end bearing seat 3. The drive end bearing seat 3 is connected to a bearing housing cover 6 by screws. The outer bearing cover 4, the bearing housing cover 6, and the part through which the shaft passes are sealed together with the magnetic oil seal 7.
[0047] The gear end bearing 15 is installed on the outside of the gear end bearing seat 17. The gear end bearing seat 17 is connected to the gear box cover 16 by bolts. The bearing outer pressure cover 4 is fixedly installed on one side of the gear end bearing 15.
[0048] The pump body 1 is a twin-screw pump with external bearings, meaning that the medium being transported and the bearings do not come into contact. As a result, the gear end bearing 15 and the drive end bearing 9 need to be isolated and sealed from the air when lubricated with oil or grease. This is where the magnetic oil seal 7 comes in to meet this sealing requirement.
[0049] The drive end bearing 9 is axially positioned by the outer bearing cover 4 and the inner bearing cover 5, and is fixed in the drive end bearing seat 3. The bearing housing cover 6 is fixed to the drive end bearing seat 3 by screws. The outer bearing cover 4, the bearing housing cover 6 and the part through which the shaft passes are introduced by a magnetic oil seal 7 to achieve the shaft seal requirements of oil lubrication or grease lubrication.
[0050] The stationary ring assembly includes a stationary ring 75, a stationary ring seat 76, and a stationary ring sealing ring 77. The stationary ring 75 is embedded in the stationary ring seat 76, and the stationary ring sealing ring 77 is installed in the groove of the stationary ring seat 76.
[0051] The rotating ring assembly includes a rotating ring seal 71, a rotating ring seat 72, a rotating ring 73, and a magnetic insert 74. The magnetic insert 74 is embedded in the rotating ring seat 72, and the rotating ring seal 71 achieves shaft sealing through an interference fit with the shaft.
[0052] The stationary ring 75 is embedded in the stationary ring seat 76. The contact surface roughness between the stationary ring 75 and the rotating ring 73 is low, achieving a contact seal. The stationary ring sealing ring 77 is installed in the groove of the stationary ring seat 76, achieving a seal with the cylindrical sealing seat surface through compression deformation. The stationary ring seat 76 is made of magnetically conductive material.
[0053] The magnetic insert 74 is embedded in the moving ring seat 72. Since the magnetic insert 74 is made of magnetized material, it attracts the stationary ring assembly and seals the contact surface between the stationary ring 75 and the moving ring 73. The number and angle distribution of the magnetic insert 74 must be sufficient to compensate for the separation of the contact surface caused by disturbance during the rotation of the shaft.
[0054] The dynamic ring seal 71 achieves shaft sealing through interference sealing with the shaft.
[0055] The installation, connection, or setting methods disclosed in this embodiment are all common mechanical connection methods. As long as they can achieve their beneficial effects, they can be implemented. Therefore, this embodiment will not elaborate on their specific structural composition and working principle.
[0056] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A twin-screw pump with a magnetic oil seal bearing housing, characterized in that: The pump body (1) includes a drive shaft (8) and a driven shaft (10) disposed inside the pump body (1). The drive shaft (8) and the driven shaft (10) are both equipped with or integrally formed with a left-handed and right-handed spiral sleeve assembly (13), and the two sets of spiral sleeve assemblies (13) are in a mutually meshing state. The pump body (1) is connected to the drive end bearing seat (3) and the gear end bearing seat (17) by several double-headed bolt assemblies (12). Both the drive end bearing seat (3) and the gear end bearing seat (17) are equipped with mechanical seals (11). The drive end bearing seat (3), the gear end bearing seat (17), the drive shaft (8), the driven shaft (10) and the mechanical seal (11) complete the shaft seal with the conveyed medium. The pump body (1) is equipped with a magnetic oil seal (7) for oil lubrication or grease lubrication shaft seal requirements. The magnetic oil seal (7) is composed of a stationary ring assembly and a moving ring assembly.
2. The twin-screw pump with magnetic oil seal bearing housing according to claim 1, characterized in that: The drive shaft (8), the driven shaft (10), and the helical sleeve assembly (13) form the core component of the twin-screw pump—the helical sleeve assembly.
3. The twin-screw pump with magnetic oil seal bearing housing according to claim 1, characterized in that: The outer circumference of the spiral sleeve assembly (13) is meshed with a bushing (2), and the bushing (2) and the spiral sleeve assembly (13) form a sealed cavity that is closed to each other.
4. The twin-screw pump with magnetic oil seal bearing housing according to claim 1, characterized in that: A synchronous gear assembly (14) with transmission support is provided between the drive shaft (8) and the driven shaft (10), and the synchronous gear assembly (14) achieves the transmission that makes the drive shaft (8) and the driven shaft (10) rotate in opposite directions.
5. The twin-screw pump with magnetic oil seal bearing housing according to claim 1, characterized in that: The pump body (1) is provided with an inlet and an outlet, and the inlet is connected to the low-pressure chamber of the twin screw pump, and the low-pressure chamber is connected to the outlet.
6. The twin-screw pump with magnetic oil seal bearing housing according to claim 3, characterized in that: The inner hole of the pump body (1) fits with the outer circle of the bushing (2). The outer circle of the bushing (2) is provided with a number of sealing ring grooves, and the high pressure chamber and low pressure chamber of the pump body (1) are provided with O-rings for isolation and support.
7. The twin-screw pump with magnetic oil seal bearing housing according to claim 1, characterized in that: The pump body (1) is a twin-screw pump with external bearings. The bearings consist of a gear end bearing (15) and a drive end bearing (9). The gear end bearing (15), the drive end bearing (9), and the magnetic oil seal (7) are used in combination.
8. The twin-screw pump with magnetic oil seal bearing housing according to claim 7, characterized in that: The drive end bearing (9) is provided with an outer bearing cover (4) and an inner bearing cover (5) for axial positioning on one side. The outer bearing cover (4), the inner bearing cover (5), and the drive end bearing (9) are all fixedly installed in the drive end bearing seat (3). The drive end bearing seat (3) is connected to a bearing housing cover (6) by screws. The outer bearing cover (4), the bearing housing cover (6), and the part through which the shaft passes are sealed together with the magnetic oil seal (7).
9. The twin-screw pump with magnetic oil seal bearing housing according to claim 8, characterized in that: The gear end bearing (15) is installed on the outside of the gear end bearing seat (17). The gear end bearing seat (17) is connected to the gear box cover (16) by bolts. The bearing outer pressure cover (4) is fixedly installed on one side of the gear end bearing (15).
10. The twin-screw pump with magnetic oil seal bearing housing according to claim 1, characterized in that: The stationary ring assembly includes a stationary ring (75), a stationary ring seat (76), and a stationary ring seal (77). The stationary ring (75) is embedded in the stationary ring seat (76), and the stationary ring seal (77) is installed in a groove of the stationary ring seat (76). The rotating ring assembly includes a rotating ring seal (71), a rotating ring seat (72), a rotating ring (73), and a magnetic insert (74), wherein the magnetic insert (74) is embedded in the rotating ring seat (72), and the rotating ring seal (71) and the shaft are sealed by interference fit.