Anti-wear and anti-occlusion dynamic pressure thrust balance disc device

Abstract

The utility model relates to the technical field of pump equipment, in particular to an anti-abrasion and anti-occlusion dynamic pressure thrust balance disc device which comprises a balance disc fixed on a pump shaft and a balance ring fixed on the inner side of a pump body, and two opposite surfaces of the balance ring and the balance disc are friction surfaces. A plurality of wedge-shaped grooves are formed in the friction face of the balance ring in the circumferential direction, the groove bottoms of the wedge-shaped grooves are inclined faces gradually rising in the rotating direction of the pump shaft, and the deeper ends of the wedge-shaped grooves are communicated with the inner side of the balance ring through liquid inlet channels. And a hydrodynamic liquid film with a certain thickness is formed between the friction surfaces of the balance disc and the balance ring, so that the fault of occlusion and locking of the balance disc device is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of pump equipment, in particular to an anti-wear, anti-biting, hydrodynamic thrust balancing disc device. Background Art

[0002] As an effective axial force balancing device, the balancing disc device is widely used in multistage pumps. With the increase of the service time of the multistage pump or long-term exposure to corrosive water quality environment, the balancing force formed on the inner and outer sides of the balancing disc device may be insufficient to balance the axial force of the rotor. At this time, the rotor moves axially towards the water inlet side, and the balancing disc and the balancing ring in the balancing disc device will be worn, resulting in shortened service life of the balancing disc and the balancing ring. In severe cases, serious accidents such as burning and jamming of the balancing device may occur, causing the multistage pump to fail to work properly. Therefore, it is urgent to develop a new type of balancing disc device to prevent the above-mentioned failures and accidents. Summary of the Utility Model

[0003] To solve the deficiencies of the above-mentioned prior art, the utility model provides an anti-wear, anti-biting, hydrodynamic thrust balancing disc device.

[0004] The technical solution of the utility model is as follows: an anti-wear, anti-biting, hydrodynamic thrust balancing disc device, including a balancing disc fixed on the pump shaft and a balancing ring fixed on the inner side of the pump body. The two faces of the balancing ring and the balancing disc facing each other are friction surfaces. A plurality of wedge-shaped grooves are arranged circumferentially on the friction surface of the balancing ring. The bottom of the wedge-shaped groove is an inclined surface that gradually rises along the rotation direction of the pump shaft. The deeper end of the wedge-shaped groove is connected to the inner side of the balancing ring through a liquid inlet channel. By arranging wedge-shaped grooves on the friction surface of the balancing ring, after the normal rotation of the pump shaft, high-pressure fluid enters the wedge-shaped grooves through the liquid inlet channel. Under the influence of the rotation of the balancing disc, the liquid in the wedge-shaped grooves is forced to be compressed, and then a hydrodynamic effect is generated, forming a liquid hydrodynamic film with a certain thickness between the friction surfaces of the balancing disc and the balancing ring, thereby preventing the failure of the balancing disc device from jamming and seizing.

[0005] The liquid inlet channel is a groove portion opened on the friction surface of the balancing ring, and both ends of the groove portion extend to the inner side of the wedge-shaped groove and the inner side of the balancing ring respectively.

[0006] The liquid inlet channel is a communication hole opened in the balancing ring, and both ends of the communication hole extend to the inner side of the wedge-shaped groove and the inner side of the balancing ring respectively.

[0007] One end of the liquid inlet channel connected to the wedge-shaped groove is located on the groove wall of the wedge-shaped groove perpendicular to the rotation direction of the pump shaft.

[0008] The opening of the wedge-shaped groove is one of an arc shape, a triangle shape, a rectangle shape, a trapezoid shape or a semi-elliptical shape.

[0009] The angle range between the bottom of the wedge-shaped groove and the friction surface of the balance ring is 10-20°.

[0010] The ratio range of the maximum opening width of the wedge-shaped groove to the ring width of the friction surface of the balance ring is 1 / 3-2 / 3.

[0011] The beneficial effects of the present utility model are as follows: In this solution, a wedge-shaped groove is provided on the friction surface of the balance ring. After the normal rotation of the pump shaft, the high-pressure fluid enters the wedge-shaped groove from the liquid inlet channel. Under the influence of the rotation of the balance disk, the liquid in the wedge-shaped groove is forced to be compressed, and then a dynamic pressure effect is generated, forming a liquid dynamic pressure film with a certain thickness between the friction surfaces of the balance disk and the balance ring, thereby preventing the balance disk device from malfunctioning due to jamming and seizure. Description of the Drawings

[0012] Figure 1 is a schematic structural diagram of the present utility model;

[0013] Figure 2 is a schematic structural diagram of the balance ring in Embodiment 1;

[0014] Figure 3 is along Figure 2 the cross-sectional view taken along the A-A direction in

[0015] Figure 4 is a schematic structural diagram of the balance ring in Embodiment 2;

[0016] Figure 5 is a schematic diagram of the opening of the wedge-shaped groove in different embodiments of the present utility model, where (a) is arc-shaped; (b) is triangular; (c) is rectangular; (d) is trapezoidal; (e) is semi-elliptical.

[0017] Reference numerals: 1, pump shaft; 2, pump body; 3, balance disk; 301, balance chamber; 4, balance ring; 401, friction surface; 5, wedge-shaped groove; 6, groove part; 7, communication hole. Detailed Embodiments

[0018] To enable those skilled in the art to better understand the technical solutions in the present utility model, the technical solutions in the present utility model will be clearly and completely described below with reference to the drawings. Other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present utility model.

[0019] As Figure 1 and Figure 2As shown, the utility model provides an anti-wear and anti-seizure dynamic pressure thrust balancing disc device, comprising a balancing disc 3 fixed on a pump shaft 1 and a balancing ring 4 fixed on the inner side of a pump body 2, wherein two surfaces of the balancing ring 4 and the balancing disc 3 facing each other are friction surfaces 401, and the friction surface 401 of the balancing ring 4 is circumferentially arranged with a plurality of wedge-shaped grooves 5, such as Figure 3 As shown, the bottom of the wedge-shaped groove 5 is an inclined surface that gradually rises along the rotation direction of the pump shaft 1, and the deeper end of the wedge-shaped groove 5 is connected to the inner side of the balance ring 4 through the liquid inlet channel. After the pump shaft 1 rotates normally, the high-pressure fluid formed by the impeller reaches the balance chamber 301 formed by the balance disc 3 and the balance ring 4, that is, the inner side of the balance ring 4, and then enters the wedge-shaped groove 5 through the liquid inlet channel. The balance disc 3 rotates with the pump shaft 1 and drives the liquid in the wedge-shaped groove 5 to be compressed along the inclined surface toward the wedge tip, generating a dynamic pressure effect, and then forming a liquid dynamic pressure film of a certain thickness between the friction surface 401 of the balance disc 3 and the balance ring 4, which plays a role in avoiding direct contact between the friction surface 401 of the balance disc 3 and the balance ring 4, thereby effectively preventing the balancing disc device from having a bite locking failure.

[0020] In Example 1, the liquid inlet channel is a groove portion 6 opened on the friction surface 401 of the balance ring 4, and two ends of the groove portion 6 extend to the inner side of the wedge groove 5 and the inner side of the balance ring 4 respectively.

[0021] like Figure 5 As shown, the opening of the wedge-shaped groove 5 can be set to be one of arc, triangle, rectangle, trapezoid or semi-ellipse according to the medium and the rotation speed of the pump shaft 1. In this embodiment, the opening of the wedge-shaped groove 5 is arc-shaped.

[0022] The angle α between the groove bottom of the wedge-shaped groove 5 and the friction surface 401 of the balance ring 4 is in the range of 10-20°.

[0023] The ratio of the maximum opening width of the wedge-shaped groove 5 to the ring width of the friction surface 401 of the balance ring 4 is in the range of 1 / 3-2 / 3.

[0024] like Figure 4 As shown, the difference between Example 2 and Example 1 is that the liquid inlet channel is a connecting hole 7 opened in the balance ring 4, and the two ends of the connecting hole 7 extend to the inner side of the wedge-shaped groove 5 and the inner side of the balance ring 4 respectively. Further preferably, in order to allow the high-pressure fluid to enter the wedge-shaped groove 5 along the rotation direction tangential to the pump shaft 1 to exert a better dynamic pressure effect, one end of the liquid inlet channel connected to the wedge-shaped groove 5 is located on the groove wall in the wedge-shaped groove 5 that is perpendicular to the rotation direction of the pump shaft 1.

[0025] When implementing the above technical solution, taking Embodiment 1 as an example, six wedge-shaped grooves 5 are arranged circumferentially on the friction surface 401 of the balance ring 4. The included angle between the inclined surface of the wedge-shaped groove 5 and the friction surface 401 of the balance ring 4 is 15°. The ring width of the friction surface 401 of the balance ring 4 is 25 mm, and the opening width of the wedge-shaped groove 5 is 12.5 mm. As the multi-stage pump operates, the pump shaft 1 drives the impeller to form high-pressure fluid. The high-pressure fluid reaches the balance chamber 301 and leaks to the low-pressure area along the axial clearance between the balance disk 3 and the balance ring 4, thereby forming a balancing force for balancing the axial force of the rotor. At the same time, the high-pressure fluid in the balance chamber 301 enters the wedge-shaped groove 5. Under the influence of the rotation of the balance disk 3, the fluid in the wedge-shaped groove 5 is compressed towards the wedge tip to generate dynamic pressure. The dynamic pressure forms a dynamic pressure liquid film on the friction surfaces of the balance disk 3 and the balance ring 4. Compared with the traditional mode where only leakage fluid exists in the axial clearance, it has a greater bearing pressure. When the balancing force formed inside and outside the balance disk device is not sufficient to balance the axial force of the rotor, this dynamic pressure liquid film will ensure that the friction surfaces 401 of the balance disk 3 and the balance ring 4 are separated and can withstand the external load brought by the axial force. After the liquid dynamic pressure in the wedge-shaped groove 5 reaches the extreme value, the liquid in the wedge-shaped groove 5 leaks and is discharged to the low-pressure area outside the balance device. The high-pressure fluid inside the balance device continuously enters the wedge-shaped groove 5 and is compressed to form a liquid film, ensuring the continuous existence of the dynamic pressure liquid film, thereby prolonging the service life of the entire balance disk device and effectively preventing the balance disk device from being jammed and locked.

Claims

1. An anti-wear and anti-seizure dynamic pressure thrust balancing disc device, comprising a balancing disc fixed on a pump shaft and a balancing ring fixed inside a pump body, wherein two surfaces of the balancing ring and the balancing disc facing each other are friction surfaces, and characterized in that: The friction surface of the balance ring is circumferentially arranged with a plurality of wedge-shaped grooves, the bottom of the wedge-shaped groove is an inclined surface which gradually rises along the rotation direction of the pump shaft, and the deeper end of the wedge-shaped groove is connected with the inner side of the balance ring through the liquid inlet channel.

2. The wear-resistant and anti-seizure dynamic pressure thrust balancing disc device according to claim 1, characterized in that: The liquid inlet channel is a groove portion opened on the friction surface of the balance ring, and two ends of the groove portion extend to the inner side of the wedge groove and the inner side of the balance ring respectively.

3. The wear-resistant and anti-seizure dynamic pressure thrust balancing disc device according to claim 1, characterized in that: The liquid inlet channel is a communicating hole opened in the balancing ring, and two ends of the communicating hole extend to the inner side of the wedge-shaped groove and the inner side of the balancing ring respectively.

4. The wear-resistant and anti-seizure dynamic pressure thrust balancing disc device according to any one of claims 1 to 3, characterized in that: One end of the liquid inlet channel connected to the wedge-shaped groove is located on a groove wall in the wedge-shaped groove that is perpendicular to the rotation direction of the pump shaft.

5. The wear-resistant and anti-seizure dynamic pressure thrust balancing disc device according to any one of claims 1 to 3, characterized in that: The opening of the wedge-shaped groove is in one of the shapes of arc, triangle, rectangle, trapezoid or semi-ellipse.

6. The wear-resistant and anti-seizure dynamic pressure thrust balancing disc device according to any one of claims 1 to 3, characterized in that: The angle between the bottom of the wedge-shaped groove and the friction surface of the balance ring is in the range of 10-20°.

7. The wear-resistant and anti-seizure dynamic pressure thrust balancing disc device according to any one of claims 1 to 3, characterized in that: The ratio of the maximum opening width of the wedge-shaped groove to the friction surface width of the balance ring is in the range of 1 / 3-2 / 3.

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