CN115750434A - Abrasion protection device falls in backplate behind sediment stuff pump - Google Patents

Abstract

The invention relates to a wear-reducing protection device for a rear protection plate of a slurry pump, which comprises a rear protection plate; the impeller is arranged on the right side of the rear protection plate, a front boss is arranged at the front part of the rear protection plate, a sealing ring is arranged at a hub at the rear part of the impeller, and the front boss is matched and sealed with the sealing ring, so that large particles in slurry are prevented from entering the side of the auxiliary impeller; the left side of the rear guard plate is provided with an auxiliary impeller, and two bosses I protrude from the rear part of the rear guard plate to form a groove structure; a boss II protrudes from the front part of the auxiliary impeller, and the boss I and the boss II are matched to form sealing, so that insufficient sealing is solved; a packing box is arranged on the left side of the auxiliary impeller, a rotating shaft sleeve is arranged on the inner side of the packing box, and 2-5 packing rings are arranged between the packing box and the rotating shaft sleeve; a water seal ring is arranged at the second ring of packing far away from the auxiliary impeller, and a packing is arranged on the right side of the water seal ring; through multi-sealing, large particles in slurry are prevented from entering a sealing side, so that the filler and the rotating shaft sleeve are protected, and the speed of replacing the filler is reduced; three lip-shaped sealing rings which are arranged in sequence are sleeved on the right side of the packing, so that good sealing is ensured.

Description

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

technical field

The invention relates to the technical field of slurry pumps, in particular to a protection device for reducing wear of a rear guard plate of a slurry pump.

Background technique

Slurry pump refers to a kind of machinery that increases the energy of solid and liquid mixed media through the action of centrifugal force, and converts electrical energy into kinetic energy and potential energy of the medium. It belongs to centrifugal pumps in terms of working principle. It is currently used in mineral processing and coal preparation plants. One of the indispensable equipment in the technological process.

The rear guard plate in the prior art has poor sealing performance with the impeller and auxiliary impeller, and the large particles in the inner chamber of the slurry pump enter the sealing side, causing greater wear and tear, and the packing needs to be replaced frequently, causing inconvenience in construction.

Packing seal refers to a dynamic sealing device that generates compression force between packing, rotating parts and fixed parts through pre-tightening or self-tightening of medium pressure. There are many structural forms, and stuffing boxes are often used to place packing. In the stuffing box in the prior art, the water seal ring is on the innermost side. By injecting clean water higher than the pressure of the pump, it is sealed with the packing. The penetration of clean water will cause the slurry to be diluted, and at the same time, large particles in the slurry will enter the sealing side and cause wear. , The service life of the slurry pump seal is short, and the packing needs to be replaced frequently.

Contents of the invention

In order to solve the problems of poor sealing performance and short service time of the slurry pump, the invention provides a protection device for reducing wear of the rear guard plate of the slurry pump.

A protection device for reducing wear of the rear guard plate of a slurry pump, including the rear guard plate; the right side of the rear guard plate is the impeller, the front part of the rear guard plate is provided with a front boss, the rear hub of the impeller is provided with a sealing ring, the front boss and The sealing ring cooperates with the seal; the left side of the rear guard plate is the auxiliary impeller, and the rear part of the rear guard plate protrudes two bosses one to form a groove structure; the front part of the auxiliary impeller protrudes a boss two, two bosses one and the boss The two cooperate to form a seal.

Further, 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 arranged inside the stuffing box; 2 to 5 packings are arranged between the stuffing box and the rotating shaft sleeve; There is a water seal ring at the root of the ring, and a packing is provided on the right side of the water seal ring; a gland is provided on the left side of the stuffing box, and the gland is in contact with the leftmost packing.

Further, three lip seal rings are arranged on the right side of the packing, and the lip seal rings are sleeved on the rotating shaft sleeve, and the lip seal rings are arranged in sequence; the outer side of the lip seal rings is sealed and connected with the stuffing box.

Furthermore, the outer side of the rear guard plate is the casing, and the rear guard plate and the casing are fixed by bolts; the impeller and the auxiliary impeller are all wrapped around the rotating shaft and rotate with the rotating shaft.

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

1. The present invention improves the structure of the rear guard plate, the front boss of the rear guard plate is sealed with the impeller sealing ring, and the matching gap between the rear guard plate and the hub of the impeller is well controlled to reduce the large particles in the slurry entering the auxiliary impeller side and reduce the slurry entering The flow rate of the auxiliary impeller cavity; two bosses form grooves at the rear of the rear guard plate, and the bosses on the end face of the auxiliary impeller cooperate with the grooves of the rear guard plate to form a sealing structure, solve the problem of insufficient sealing, and lengthen the maintenance time of the pump The time interval of the slurry pump makes the use of the slurry pump more economical and convenient.

2. There are 2 to 5 packings between the stuffing box and the rotating shaft sleeve, and a packing is provided inside the water seal ring. Through multiple seals, large particles in the slurry can be reduced from entering the sealing side, thereby reducing wear and tear. To protect the filler and shaft sleeve, reduce the speed of filler replacement.

3. The lip-shaped sealing ring further seals the slurry. The lip-shaped sealing ring has good sealing performance within a certain pressure and temperature range, and can automatically improve the sealing degree with the increase of pressure to ensure a good sealing.

Description of drawings

Fig. 1 is a schematic structural view of a slurry pump according to an embodiment of the present invention;

Fig. 2 is a schematic structural view of a protection device for reducing wear of a rear guard plate of a slurry pump in an embodiment of the present invention;

Fig. 3 is the left side view of rear guard plate in the embodiment of the present invention;

Fig. 4 is A-A sectional view among Fig. 3;

Explanation of reference signs: 1, rear guard plate; 2, impeller; 3, front boss; 4, sealing ring; 5, auxiliary impeller; 6, boss one; 7, boss two; 8, shaft sleeve; 9, Lip seal ring; 10, casing; 11, stuffing box; 12, packing; 13, water seal ring; 14, gland; 15, bolt; 16, rotating shaft.

Detailed ways

The present invention will be described in further detail below in conjunction with accompanying drawings 1-4.

The embodiment of the invention discloses a protection device for reducing wear of a rear guard plate of a slurry pump.

Referring to Fig. 2, Fig. 3 and Fig. 4, a protection device for reducing wear of the rear guard plate of a slurry pump includes a rear guard plate 1; the right side of the rear guard plate 1 is the impeller 2, and the front part of the rear guard plate 1 is provided with a front boss 3. There is a seal ring 4 at the rear hub of the impeller 2, and the front boss 3 cooperates with the seal ring 4 to seal; the left side of the rear guard plate 1 is the auxiliary impeller 5, and the rear guard plate 1 protrudes two bosses-6 A groove structure is formed; a boss 2 7 protrudes from the front of the auxiliary impeller 5, and two boss 1 6 and boss 2 7 cooperate to form a seal.

Referring to Figure 2, there is a stuffing box 11 on the left side of the auxiliary impeller 5, and there is a gap between the stuffing box 11 and the auxiliary impeller 5; the inner side of the stuffing box 11 is provided with a shaft sleeve 8; Packing 12; a water seal ring 13 is provided at the second packing 12 in the direction away from the auxiliary impeller 5, and a packing 12 is provided on the right side of the water seal ring 13; a gland 14 is provided on the left side of the stuffing box 11, and the gland 14 Contact and compress with the leftmost packing 12. Commonly used packing materials include asbestos fabric, carbon fiber, rubber, flexible graphite and engineering plastics, etc., which adopt multi-ring or spiral multi-layer structure, and are prefabricated in the form of packing 12 .

Referring to Figure 2, there are three lip seals 9 on the right side of the packing 12, the lip seals 9 are sleeved on the shaft sleeve 8, and the lip seals 9 are arranged in sequence; the outer side of the lip seals 9 is sealed with the stuffing box 11 connect.

Referring to Fig. 1 and Fig. 2, the outer side of the rear guard plate 1 is a casing 10, and the rear guard plate 1 and the casing 10 are fixed by bolts 15;

In the prior art, the water seal ring 13 is arranged on the front side of the packing 12, and the upper side of the water seal ring 13 is connected with a water inlet hole, and the water inlet hole obliquely passes through the stuffing box 11 to communicate with the outside. Clean water enters from the water inlet and flows into the gap formed by the auxiliary impeller 5, the stuffing box 11 and the rear guard plate 1, which will dilute the slurry, and at the same time, the seal is not sufficient, causing large particles in the slurry to enter the sealing side and increase wear. In the embodiment of the present invention, the water seal ring 13 is arranged at the second ring packing 12 in the direction away from the auxiliary impeller 5, clean water enters from the upper part of the water seal ring 13, and the front side of the water seal ring 13 is provided with a packing 12 to separate the clean water and The slurry is separated, and the three lip seal rings 9 are further sealed. Compared with the prior art, the structure in the embodiment of the present invention has strong sealing performance and long service life.

The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention, so: all equivalent changes made according to the structure, shape and principle of the present invention should be covered by the protection scope of the present invention Inside.

Claims (4)

1. A wear-reducing protection device for the rear guard plate of a slurry pump, characterized in that it includes a rear guard plate (1); the right side of the rear guard plate (1) is the impeller (2), and the rear guard plate (1) ) is provided with a front boss (3), and the rear hub of the impeller (2) is provided with a sealing ring (4), and the front boss (3) cooperates with the sealing ring (4) to seal; the rear The left side of the guard plate (1) is the auxiliary impeller (5), the rear of the rear guard plate (1) protrudes two bosses one (6) to form a groove structure; the front of the auxiliary impeller (5) protrudes One boss two (7), the two bosses one (6) and boss two (7) cooperate to form a seal. 2. A protection device for reducing wear of the rear guard plate of a slurry pump according to claim 1, characterized in that: a stuffing box (11) is provided on the left side of the auxiliary impeller (5), and the stuffing box (11) There is a gap with the auxiliary impeller (5); the inside of the stuffing box (11) is provided with a shaft sleeve (8); between the stuffing box (11) and the shaft sleeve (8) there are 2 to 5 packings (12 ); the second ring packing (12) away from the auxiliary impeller (5) is provided with a water seal ring (13), and a packing (12) is provided on the right side of the water seal ring (13); the A gland (14) is provided on the left side of the stuffing box (11), and the gland (14) is in contact with the leftmost packing (12) for compression. 3. A protection device for reducing wear of the rear guard plate of a slurry pump according to claim 2, characterized in that three lip seals (9) are provided on the right side of the packing (12), and the lip The sealing ring (9) is sleeved on the rotating shaft sleeve (8), and the lip sealing rings (9) are arranged in sequence; the outer side of the lip sealing ring (9) is in sealing connection with the stuffing box (11). 4. A protection device for reducing wear of 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 a casing (10), and the rear guard plate (1) It is fixed with the casing (10) by bolts (15); the impeller (2) and the auxiliary impeller (5) are all around the rotating shaft (16) and rotate with the rotating shaft (16).

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