Novel mechanical seal of slurry pump

Abstract

The utility model relates to the technical field of slurry pump sealing, in particular to a novel mechanical seal of a slurry pump, which comprises a shaft body, an equipment shaft sleeve is mounted outside the shaft body, a mechanical seal shaft sleeve is mounted outside the equipment shaft sleeve, and a spring seat is nested outside the mechanical seal shaft sleeve. A first movable ring and a second movable ring which are arranged outside the mechanical seal shaft sleeve in a sleeving mode are arranged on the two sides of the spring seat, two sets of compression springs are installed on the two sides of the spring seat, and the outer circle of the first movable ring and the outer circle of the second movable ring are installed in the spring seat in a sliding mode. The sealing structure has the beneficial effects that the first gland and the second gland are installed together to achieve mechanical sealing, mechanical sealing is formed through rotating running-in of the movable ring and the static ring, the double-sealing structure can be provided with a cooling liquid cavity outside the movable ring base, cooling liquid flowing circularly is used for cooling the sealing structure, and the service life is prolonged; a threaded groove is formed outside the movable ring seat, a threaded pump can automatically drive cooling liquid to circularly flow in the process that the movable ring seat rotates along with the movable ring, and the cooling effect is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of slurry pump sealing technology, and in particular to a novel mechanical seal for slurry pumps. Background Technology

[0002] Slurry pumps are widely used in industries such as mining, power, metallurgy, and coal. They mainly consist of a pump body, pump cover, pump shaft, bearing assembly, and shaft sealing device. Shaft seals are divided into packing seals, auxiliary impeller seals, and mechanical seals. Due to their high cost and difficult maintenance, mechanical seals are rarely used. Auxiliary impeller seals are also rarely used due to limitations. Currently, packing seals are the most common, and packing wire is often used as the packing material.

[0003] Chinese patent application number CN201410081492.1 discloses a cavity-locking zero-leakage shaft seal mechanism for a slurry pump, comprising a cavity-locking shaft seal box, a cavity-locking gland, and a pump shaft. A cavity-locking sleeve is fitted onto the pump shaft, and the outer wall of the front end of the cavity-locking sleeve has an annular protrusion. The mechanism includes a moving ring push-tightening ring, a cavity-locking secondary gland, a moving ring, and a stationary ring. Multiple springs are respectively provided in the annular cavity at the bottom of the moving ring push-tightening ring. One end of each spring abuts against the rear outer wall of the annular protrusion, and the other end abuts against the bottom surface of the annular cavity. The cavity-locking secondary gland locks the moving ring push-tightening ring. The moving ring is fixed to the outer wall of the cavity-locking sleeve and abuts against the rear end of the moving ring push-tightening ring. The stationary ring is fixed to the inner wall of the cavity-locking gland. The moving ring and the stationary ring are in a non-contact dynamic pressure type sealing fit. A packing and a water seal ring are respectively provided between the inner wall of the cavity-locking shaft seal box and the cavity-locking sleeve. While the aforementioned patents can provide a good seal, the high density and numerous impurities in the fluid transported by the slurry pump, especially in the harsh working conditions of mineral processing plants, often lead to increased machine temperature, resulting in a deterioration in the sealing effect and affecting its use. Utility Model Content

[0004] This utility model proposes a new type of mechanical seal for slurry pumps to solve the above-mentioned problems.

[0005] The technical solution of this utility model is implemented as follows:

[0006] A novel mechanical seal for a slurry pump includes a shaft body, an equipment bushing mounted on the outside of the shaft body, a mechanical seal bushing mounted on the outside of the equipment bushing, and a spring seat nested outside the mechanical seal bushing. A first moving ring and a second moving ring, fitted onto the outside of the mechanical seal bushing, are disposed on both sides of the spring seat. Two sets of compression springs are mounted on both sides of the spring seat. The outer circumferences of the first and second moving rings are slidably mounted within the spring seat. A first stationary ring is disposed on the side of the first moving ring away from the spring seat, and the first stationary ring is fixed inside a first pressure plate by an anti-rotation pin. A second stationary ring is disposed on the side of the second moving ring away from the spring seat, and the second stationary ring is fixed inside a second pressure plate by an anti-rotation pin. The first and second pressure plates are bolted together. The first and first stationary rings are rotatably fitted, as are the second moving and second stationary rings. A coolant cavity is formed between the inner cavity of the first and second pressure plates and the spring seat. A coolant inlet and a coolant outlet are formed on the outer wall of the second pressure plate, communicating with the coolant cavity. The coolant inlet and the coolant outlet are respectively connected to the spaces at both ends of the spring seat.

[0007] Furthermore, a movable ring seat is detachably connected and installed on the outer circle of the spring seat. A threaded groove is formed on the outer wall of the movable ring seat, and the threaded groove is rotatably fitted with the inner wall of the second pressure cover.

[0008] Furthermore, sealing rings are fixed between the equipment bushing and the shaft body, between the mechanical seal bushing and the equipment bushing, between the first moving ring and the mechanical seal bushing, between the second moving ring and the mechanical seal bushing, between the first stationary ring and the first pressure plate, between the second stationary ring and the second pressure plate, and between the first pressure plate and the second pressure plate.

[0009] Furthermore, the coolant inlet and the coolant outlet are connected together through a coolant circulation system.

[0010] Furthermore, slots for fixing the compression spring are formed on both sides of the spring seat.

[0011] The beneficial effects of this utility model by adopting the above technical solution are as follows: the first pressure cover and the second pressure cover are installed together to achieve a mechanical seal, the rotation and running-in of the rotating ring and the stationary ring form a mechanical seal, the double sealing structure can set a coolant chamber outside the rotating ring seat, and use the circulating coolant to cool the sealing structure and extend its service life; the rotating ring seat is provided with a threaded groove outside, and as the rotating ring seat rotates with the rotating ring, a threaded pump can be formed to automatically drive the coolant to circulate, ensuring the cooling effect. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a main sectional view of the present invention;

[0014] Figure 2 This is an axonometric sectional view of the present invention;

[0015] Figure 3 This is a perspective view of the present invention;

[0016] Figure 4 This is the front view of this utility model;

[0017] Figure 5 This is a top view of the present invention.

[0018] The annotations in the attached figures are explained as follows:

[0019] 1. Shaft body; 2. Equipment bushing; 3. Mechanical seal bushing; 4. Spring seat; 5. Compression spring; 6. First moving ring; 7. Second moving ring; 8. First stationary ring; 9. Second stationary ring; 10. First gland; 11. Second gland; 12. Coolant chamber; 13. Moving ring seat; 14. Threaded groove; 15. Coolant inlet hole; 16. Coolant outlet hole; 17. Bushing locking ring. Detailed Implementation

[0020] 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.

[0021] like Figures 1-5As shown, the new type of mechanical seal for a slurry pump includes a shaft body 1, an equipment bushing 2 installed outside the shaft body 1, and a mechanical seal bushing 3 installed outside the equipment bushing 2. The mechanical seal bushing 3 is fixed to the equipment bushing 2 by a bushing locking ring 17. A spring seat 4 is nested outside the mechanical seal bushing 3. A first moving ring 6 and a second moving ring 7 are provided on both sides of the spring seat 4, which are fitted outside the mechanical seal bushing 3. Two sets of compression springs 5 ​​are installed on both sides of the spring seat 4. The outer circles of the first moving ring 6 and the second moving ring 7 are slidably installed inside the spring seat 4. Gear rings are formed on the inner walls at both ends of the spring seat 4. Teeth that slide with the gear rings are formed on the outer circles of the first moving ring 6 and the second moving ring 7, thereby ensuring that the first moving ring 6 and the second moving ring 7 can drive the spring seat 4 to rotate together. A first stationary ring 8 is provided on the side of the first moving ring 6 away from the spring seat 4. The first stationary ring 8 is fixed inside the first pressure cover 10 by an anti-rotation pin. A second stationary ring 9 is provided on the side of the second moving ring 7 away from the spring seat 4. The second stationary ring 9 is connected to the spring seat 4. The anti-rotation pin is fixed inside the second pressure cover 11. The first pressure cover 10 and the second pressure cover 11 are fixed together by bolts. The bushing locking ring 17 is stuck at the end of the second pressure cover 11 and is rotatably installed with the second pressure cover 11 to protect the second stationary ring 9. The first moving ring 6 and the first stationary ring 8 are rotatably fitted, and the stationary ring and the moving ring are run-in to seal the cooling medium. The second moving ring 7 and the second stationary ring 9 are rotatably fitted. A coolant cavity 12 is formed between the inner cavity of the first pressure cover 10 and the second pressure cover 11 and the spring seat 4. A coolant inlet hole 15 and a coolant outlet hole 16 are formed on the outer wall of the second pressure cover 11, which are connected to the coolant cavity 12. The coolant inlet hole 15 and the coolant outlet hole 16 are respectively connected to the spaces at both ends of the spring seat 4. The circulation of coolant maximizes the removal of heat and extends the service life. The cartridge-type double-end mechanical seal effectively improves the sealing effect, reduces slurry leakage, and reduces environmental pollution and maintenance costs.

[0022] In this embodiment, a rotating ring seat 13 is detachably connected and installed on the outer circle of the spring seat 4. A threaded groove 14 is formed on the outer wall of the rotating ring seat 13. The threaded groove 14 is rotatably fitted with the inner wall of the second pressure cover 11. The rotating ring seat 13 with the threaded groove 14 forms a threaded pump structure. When the rotating ring seat 13 rotates with the rotating ring, the threaded groove 14 can be used to automatically deliver the coolant from one end of the coolant inlet hole to one end of the coolant outlet hole, thereby realizing the circulation of the coolant.

[0023] In this embodiment, in order to improve the mechanical seal effect, sealing rings are fixed between the equipment bushing 2 and the shaft body 1, between the mechanical seal bushing 3 and the equipment bushing 2, between the first moving ring 6 and the mechanical seal bushing 3, between the second moving ring 7 and the mechanical seal bushing 3, between the first stationary ring 8 and the first pressure cover 10, between the second stationary ring 9 and the second pressure cover 11, and between the first pressure cover 10 and the second pressure cover 11.

[0024] In this embodiment, the coolant inlet 15 and the coolant outlet 16 are connected together by a coolant circulation system. A coolant heat dissipation structure, a circulation structure, a storage tank, and a drain valve can be installed between the coolant inlet 15 and the coolant outlet 16 to achieve efficient heat dissipation of the coolant.

[0025] In this embodiment, slots for fixing compression springs 5 ​​are formed on both sides of the spring seat 4. The slots on both sides are staggered to facilitate the installation of the two sets of compression springs 5.

[0026] The working principle of this utility model is as follows: During installation, the first stationary ring 8 is first fixed on the inner wall of the first pressure cover 10, the second stationary ring 9 is fixed on the inner wall of the second pressure cover 11, the second moving ring 7 is placed inside the second pressure cover 11, and then the moving ring seat 13 is installed on the outside of the second moving ring 7 by means of threads. The compression spring 5 and the spring seat 4 are slidably installed inside the moving ring seat 13. The filler is filled on the side of the spring seat 4 away from the compression spring 5. Then the first moving ring 6 is installed, and the first moving ring 6 is used to compress the compression spring 5 and the filler. Finally, the first pressure cover 10 and the second pressure cover 11 are fixed together with bolts.

[0027] Components not described in detail in this article are existing technologies.

[0028] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A novel mechanical seal for a slurry pump, comprising a shaft body (1), an equipment bushing (2) externally mounted on the shaft body (1), and a mechanical seal bushing (3) externally mounted on the equipment bushing (2), characterized in that: The mechanical seal bushing (3) is nested with a spring seat (4). A first moving ring (6) and a second moving ring (7) are provided on both sides of the spring seat (4) and are fitted onto the outside of the mechanical seal bushing (3). Two sets of compression springs (5) are installed on both sides of the spring seat (4). The outer circles of the first moving ring (6) and the second moving ring (7) are slidably installed inside the spring seat (4). A first stationary ring (8) is provided on the side of the first moving ring (6) away from the spring seat (4). The first stationary ring (8) is fixed inside the first pressure plate (10) by an anti-rotation pin. A second stationary ring (9) is provided on the side of the second moving ring (7) away from the spring seat (4). The second stationary ring (9) is fixed inside the first pressure plate (10) by an anti-rotation pin. Inside the two pressure caps (11), the first pressure cap (10) and the second pressure cap (11) are fixed together by bolts. The first moving ring (6) and the first stationary ring (8) are rotatably engaged, and the second moving ring (7) and the second stationary ring (9) are rotatably engaged. A coolant cavity (12) is formed between the inner cavity of the first pressure cap (10) and the second pressure cap (11) and the spring seat (4). A coolant inlet hole (15) and a coolant outlet hole (16) are formed on the outer wall of the second pressure cap (11) and are connected to the coolant cavity (12). The coolant inlet hole (15) and the coolant outlet hole (16) are respectively connected to the spaces at both ends of the spring seat (4).

2. The novel slurry pump mechanical seal according to claim 1, characterized in that: A movable ring seat (13) is detachably connected to the outer circle of the spring seat (4). A threaded groove (14) is formed on the outer wall of the movable ring seat (13). The threaded groove (14) is rotatably fitted with the inner wall of the second pressure cover (11).

3. The novel slurry pump mechanical seal according to claim 1, characterized in that: Sealing rings are fixed between the equipment bushing (2) and the shaft body (1), between the mechanical seal bushing (3) and the equipment bushing (2), between the first moving ring (6) and the mechanical seal bushing (3), between the second moving ring (7) and the mechanical seal bushing (3), between the first stationary ring (8) and the first pressure cap (10), between the second stationary ring (9) and the second pressure cap (11), and between the first pressure cap (10) and the second pressure cap (11).

4. The novel slurry pump mechanical seal according to claim 1, characterized in that: The coolant inlet (15) and the coolant outlet (16) are connected together through a coolant circulation system.

5. The novel slurry pump mechanical seal according to claim 1, characterized in that: The spring seat (4) has slots formed on both sides to fix the compression spring (5).

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