A wear-reducing protection device for the rear guard plate of a slurry pump

Abstract

This invention relates to a wear-reducing protection device for the rear guard plate of a slurry pump, comprising a rear guard plate; an impeller is located on the right side of the rear guard plate, with a front boss at the front of the rear guard plate and a sealing ring at the rear hub of the impeller, the front boss and the sealing ring cooperating to seal and reduce the entry of large particles in the slurry into the secondary impeller side; an secondary impeller is located on the left side of the rear guard plate, with two protrusions forming a groove structure at the rear of the rear guard plate; a second protrusion is located at the front of the secondary impeller, the first and second protrusions cooperating to form a seal, solving the problem of insufficient sealing; a stuffing box is located on the left side of the secondary impeller, with a rotating shaft sleeve inside the stuffing box, and 2 to 5 packing rings between the stuffing box and the rotating shaft sleeve; a water seal ring is located at the second packing ring away from the secondary impeller, and a packing ring is located on the right side of the water seal ring; through multiple seals, the entry of large particles in the slurry into the sealing side is reduced, which protects the packing and rotating shaft sleeve and reduces the packing replacement speed; three sequentially arranged lip seals are fitted on the right side of the packing ring to ensure good sealing.

Description

Technical Field

[0001] This invention relates to the technical field of slurry pumps, and in particular to a wear-reducing protection device for the rear guard plate of a slurry pump. Background Technology

[0002] A slurry pump is a machine that increases the energy of a solid-liquid mixture by using centrifugal force, converting electrical energy into the kinetic and potential energy of the medium. In terms of working principle, it belongs to centrifugal pumps and is currently one of the indispensable pieces of equipment in various processes of mineral processing and coal preparation plants.

[0003] The rear guard plate in the existing technology has poor sealing performance with the impeller and auxiliary impeller. Large particles in the inner cavity of the slurry pump can enter the sealing side, causing significant wear and requiring frequent packing replacement, which inconveniences construction.

[0004] Packing seals are dynamic sealing devices that create a clamping force between the packing and rotating or stationary parts through pre-tightening or self-tightening under medium pressure. They come in various structural forms, with stuffing boxes commonly used to house the packing. In existing stuffing boxes, the water seal ring is located on the innermost side. Sealing is achieved by injecting clean water at a pressure higher than the pump's outlet pressure, which, in conjunction with the packing, leads to water seepage and dilution of the slurry. Simultaneously, large particles in the slurry enter the sealing side, causing wear. This results in short-life slurry pump seals that require frequent packing replacements. Summary of the Invention

[0005] To address the issues of poor sealing and short service life in slurry pumps, this invention provides a wear-reducing protection device for the rear guard plate of a slurry pump.

[0006] A wear-reducing protection device for the rear guard plate of a slurry pump includes a rear guard plate; an impeller is located on the right side of the rear guard plate, a front boss is provided at the front of the rear guard plate, and a sealing ring is provided at the rear hub of the impeller, with the front boss and the sealing ring cooperating to form a seal; an auxiliary impeller is located on the left side of the rear guard plate, with two bosses 1 protruding at the rear of the rear guard plate to form a groove structure; a boss 2 protruding at the front of the auxiliary impeller, with the two bosses 1 and the boss 2 cooperating to form a seal.

[0007] Furthermore, a stuffing box is provided on the left side of the auxiliary impeller, and there is a gap between the stuffing box and the auxiliary impeller; a rotating shaft sleeve is provided inside the stuffing box; 2 to 5 packing rings are provided between the stuffing box and the rotating shaft sleeve; a water seal ring is provided at the second packing ring away from the auxiliary impeller, and a packing ring is provided on the right side of the water seal ring; a pressure cap is provided on the left side of the stuffing box, and the pressure cap contacts and presses against the leftmost packing ring.

[0008] Furthermore, three lip seals are provided on the right side of the packing, and the lip seals are fitted onto the rotating shaft sleeve, with the lip seals arranged in sequence; the outer side of the lip seals is sealed to the stuffing box.

[0009] Furthermore, the outer side of the rear guard plate is the casing, and the rear guard plate is fixed to the casing with bolts; the impeller and the auxiliary impeller are both wrapped around the rotating shaft and rotate with the rotating shaft.

[0010] In summary, the present invention has the following beneficial technical effects:

[0011] 1. This invention improves the rear guard plate structure. The front boss of the rear guard plate seals with the impeller sealing ring, controlling the fit clearance between the rear guard plate and the impeller hub, reducing the entry of large particles in the slurry into the secondary impeller side, and lowering the flow velocity of the slurry into the secondary impeller cavity. Two bosses on the rear part of the rear guard plate form a groove, and a boss on the end face of the secondary impeller cooperates with the groove of the rear guard plate to form a sealing structure, solving the problem of insufficient sealing, extending the time interval for pump shutdown and maintenance, and making the slurry pump more economical and convenient to use.

[0012] 2. Two to five packing rings are installed between the stuffing box and the rotating shaft sleeve, and one packing ring is installed inside the water seal ring. Through multiple seals, large particles in the slurry are reduced from entering the sealing side, thereby reducing wear and protecting the packing and rotating shaft sleeve, and reducing the packing replacement speed.

[0013] 3. The lip seal further seals the slurry. The lip seal has good sealing performance within a certain pressure and temperature range, and can automatically improve the sealing degree as the pressure increases, ensuring a good seal. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the slurry pump structure according to an embodiment of the present invention;

[0015] Figure 2 This is a schematic diagram of a wear-reducing protection device for the rear guard plate of a slurry pump according to an embodiment of the present invention;

[0016] Figure 3 This is a left view of the rear guard plate in an embodiment of the present invention;

[0017] Figure 4 yes Figure 3 Sectional view of AA in the middle;

[0018] Explanation of reference numerals in the attached drawings: 1. Rear guard plate; 2. Impeller; 3. Front boss; 4. Sealing ring; 5. Secondary impeller; 6. Boss one; 7. Boss two; 8. Shaft sleeve; 9. Lip seal ring; 10. Housing; 11. Stuffing box; 12. Packing; 13. Water seal ring; 14. Gland; 15. Bolt; 16. Shaft. Detailed Implementation

[0019] The following is in conjunction with the appendix Figure 1-4 The present invention will be described in further detail below.

[0020] This invention discloses a wear-reducing protection device for the rear guard plate of a slurry pump.

[0021] Reference Figure 2 , Figure 3 , Figure 4 A wear-reducing protection device for the rear guard plate of a slurry pump includes a rear guard plate 1; an impeller 2 is located on the right side of the rear guard plate 1, a front boss 3 is provided at the front of the rear guard plate 1, and a sealing ring 4 is provided at the rear hub of the impeller 2, with the front boss 3 and the sealing ring 4 cooperating to seal; an auxiliary impeller 5 is located on the left side of the rear guard plate 1, with two bosses 1 6 protruding at the rear of the rear guard plate 1 to form a groove structure; a boss 2 7 protrudes at the front of the auxiliary impeller 5, with the two bosses 1 6 and the boss 2 7 cooperating to form a seal.

[0022] Reference Figure 2 A stuffing box 11 is located on the left side of the auxiliary impeller 5, with a gap between the stuffing box 11 and the auxiliary impeller 5. A rotating shaft sleeve 8 is located inside the stuffing box 11. Two to five packing rings 12 are located between the stuffing box 11 and the rotating shaft sleeve 8. A water seal ring 13 is located at the second ring of packing rings 12 away from the auxiliary impeller 5, and a packing ring 12 is located to the right of the water seal ring 13. A pressure cap 14 is located on the left side of the stuffing box 11, and the pressure cap 14 contacts and presses against the leftmost packing ring 12. Commonly used packing materials include asbestos fabric, carbon fiber, rubber, flexible graphite, and engineering plastics, which adopt a multi-ring or spiral multi-layer structure and are prefabricated in the form of packing rings 12.

[0023] Reference Figure 2 Three lip seals 9 are provided on the right side of the packing 12. The lip seals 9 are fitted onto the rotating shaft sleeve 8 and are arranged in sequence. The outer side of the lip seals 9 is sealed to the stuffing box 11.

[0024] Reference Figure 1 , Figure 2 The outer side of the rear guard plate 1 is the housing 10, and the rear guard plate 1 and the housing 10 are fixed by bolts 15; the impeller 2 and the auxiliary impeller 5 are both wrapped around the rotating shaft 16 and rotate with the rotating shaft 16.

[0025] In the prior art, the water seal ring 13 is positioned in front of the packing 12, and a water inlet is connected to the upper side of the water seal ring 13, which obliquely passes through the stuffing box 11 and connects to the outside. Clean water enters through the water inlet and flows into the gap formed by the auxiliary impeller 5, the stuffing box 11, and the rear guard plate 1, diluting the slurry. Simultaneously, insufficient sealing allows large particles in the slurry to enter the sealing side, increasing wear. In this embodiment of the invention, the water seal ring 13 is positioned at the second ring of packing 12 away from the auxiliary impeller 5. Clean water enters from the upper part of the water seal ring 13, and the packing 12 in front of the water seal ring 13 separates the clean water and the slurry. Three lip-shaped sealing rings 9 further seal the area. Compared to the prior art, the structure in this embodiment of the invention has stronger sealing performance and a longer service life.

[0026] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A wear-reducing protection device for the rear guard plate of a slurry pump, characterized in that: Includes a rear guard plate (1); the right side of the rear guard plate (1) is an impeller (2), the front part of the rear guard plate (1) is provided with a front boss (3), the rear hub of the impeller (2) is provided with a sealing ring (4), the front boss (3) and the sealing ring (4) cooperate to seal; the left side of the rear guard plate (1) is an auxiliary impeller (5), the rear part of the rear guard plate (1) has two protrusions (6) to form a groove structure; the front part of the auxiliary impeller (5) has a protrusion (7), the two protrusions (6) and the protrusion (7) cooperate to form a seal; A stuffing box (11) is provided on the left side of the auxiliary impeller (5), and there is a gap between the stuffing box (11) and the auxiliary impeller (5); a rotating shaft sleeve (8) is provided on the inner side of the stuffing box (11); 2 to 5 packing rings (12) are provided between the stuffing box (11) and the rotating shaft sleeve (8); a water seal ring (13) is provided at the second ring of packing rings (12) away from the auxiliary impeller (5), and a packing ring (12) is provided on the right side of the water seal ring (13); a pressure cap (14) is provided on the left side of the stuffing box (11), and the pressure cap (14) contacts and presses against the leftmost packing ring (12); The packing (12) has three lip seals (9) on the right side. The lip seals (9) are fitted onto the rotating shaft sleeve (8) and are arranged in sequence. The outer side of the lip seals (9) is sealed to the stuffing box (11).

2. The wear-reducing protection device for the rear guard plate of a slurry pump according to claim 1, characterized in that: The outer side of the rear guard plate (1) is the housing (10), and the rear guard plate (1) and the housing (10) are fixed by bolts (15); the impeller (2) and the auxiliary impeller (5) are both around the rotating shaft (16) and rotate with the rotating shaft (16).

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