Mechanical sealing structure for pump

Abstract

The utility model discloses a mechanical sealing structure for a pump, which comprises a movable ring, a static ring and a gland for sealing a pump shaft, a sealing assembly is arranged between the movable ring and the gland and comprises a convex ring, a first sealing ring and an air delivery pipe, the convex ring is arranged on the outer surface of the movable ring, a sealing tire bag is arranged in the first sealing ring, and the air delivery pipe is arranged in the first sealing ring. The end, embedded into the first sealing ring, of the air conveying pipe is connected with the sealing tire bag, an outer sealing ring, an inner sealing ring and a sealing ring are arranged on the outer side of the movable ring, and the outer sealing ring and the inner sealing ring are distributed on the two sides of the protruding ring. An air nozzle is arranged at the end, protruding out of the gland, of the air conveying pipe, an external conventional air inflation device inflates air from the air nozzle to enable the sealing tire bag to expand, the expanded sealing tire bag is filled in the sealing groove of the protruding ring, and the protruding ring and the first sealing ring are sealed, and when the sealing gap between the protruding ring and the first sealing ring is increased due to long-term rotation of the movable ring and the protruding ring, the sealing gap between the protruding ring and the first sealing ring is enlarged. The sealing tire bag is expanded through inflation, and the sealing gap is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical sealing devices, and in particular relates to a mechanical sealing structure for a pump. Background Art

[0002] A common sealing method for the output shaft of a pump is a mechanical seal. A mechanical seal is a device that prevents fluid leakage by at least one pair of end faces perpendicular to the rotation axis, which are kept in contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of a compensation mechanism, as well as the cooperation of an auxiliary seal. Chinese utility model patent application number CN202222168780.3 discloses a leakage-proof mechanical seal structure for pumps. Mechanical seals are a type of seal commonly used in shaft accessories.

[0003] When a mechanical seal is used on the pump output shaft, the dynamic ring and the stationary ring are installed on the outside of the pump output shaft. With the long-term use of the pump, the pump output shaft rotates for a long time, and the sealing gap between the dynamic ring and the pressure cover on the outside of the output shaft increases, increasing the risk of leakage and reducing the sealing effect between the dynamic ring and the pressure cover. When a mechanical seal is used on the pump shaft, there is a problem that the sealing gap between the dynamic ring and the pressure cover increases, resulting in a reduction in the sealing effect. For this reason, this application proposes a mechanical seal structure for a pump. Utility Model Content

[0004] The purpose of the present utility model is to provide a mechanical seal structure for a pump, so as to solve the problem of increased sealing gap between the dynamic ring and the gland proposed in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a mechanical seal structure for a pump, comprising a dynamic ring, a static ring and a pressure cover for sealing a pump shaft, a sealing assembly being provided between the dynamic ring and the pressure cover, the sealing assembly comprising a convex ring, a first sealing ring and an air pipe, the convex ring being mounted on the outer surface of the dynamic ring, a sealing bladder being provided inside the first sealing ring, one end of the air pipe being embedded in the first sealing ring and connected to the sealing bladder, an outer sealing ring, an inner sealing ring and a sealing ring being provided on the outer side of the dynamic ring, the outer sealing ring and the inner sealing ring being distributed on both sides of the convex ring.

[0006] Preferably, an annular sealing groove is provided in the middle of the outer surface of the dynamic ring, and the sealing fetal sac is adapted to the sealing groove.

[0007] Preferably, a first annular groove is provided in the middle of the inner surface of the first sealing ring, and the sealed fetal sac passes through the first annular groove.

[0008] Preferably, the gland is provided with a passage for an air delivery pipe to pass through, and the interior of the air delivery pipe is communicated with the interior of the sealed fetal sac.

[0009] Preferably, the outer sealing ring, the inner sealing ring and the sealing ring are parallel, the opposite surfaces of the outer sealing ring and the sealing ring are matched, and the center of the outer sealing ring and the center of the dynamic ring are on the same axis.

[0010] Preferably, a second sealing ring and a second ring groove are provided in the middle of the inner surface of the outer sealing ring, the second sealing ring is located in the second ring groove, the outer sealing ring and the second sealing ring have the same inner diameter, and the inner diameter of the outer sealing ring is the same as the outer diameter of the dynamic ring.

[0011] Preferably, a third sealing ring is provided on the surface of the outer sealing ring facing the convex ring, the center of the third sealing ring and the center of the dynamic ring are on the same axis, and the inner diameter of the third sealing ring is the same as the outer diameter of the dynamic ring.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] In the utility model, an air nozzle is provided at the end of the air delivery pipe protruding from the gland, and an external conventional inflation device inflates air from the air nozzle to expand the sealed fetal sac, and the expanded sealed fetal sac fills the sealing groove of the convex ring, so that the convex ring and the first sealing ring are sealed. When the dynamic ring and the convex ring rotate for a long time, causing the sealing gap between the convex ring and the first sealing ring to increase, the air is inflated to expand the sealed fetal sac, thereby reducing the sealing gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the utility model;

[0015] Figure 2 For the utility model Figure 1 A schematic diagram of the enlarged structure of the middle part A;

[0016] Figure 3 This is a side structural diagram of the outer sealing ring of the present invention;

[0017] Figure 4 This is a schematic diagram of the three-dimensional structure of the dynamic ring of the utility model;

[0018] Figure 5 This is a side structural diagram of the first sealing ring of the present invention;

[0019] In the figure: 1, pump shaft; 2, dynamic ring; 3, static ring; 4, gland; 5, air pipe; 6, first sealing ring; 7, outer sealing ring; 8, inner sealing ring; 9, sealing ring; 21, convex ring; 61, sealing fetal sac; 71, second sealing ring; 72, third sealing ring; 211, sealing groove. DETAILED DESCRIPTION

[0020] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Example

[0022] See also Figures 1 to 5 The utility model provides a technical solution: a mechanical seal structure for a pump, comprising a dynamic ring 2, a static ring 3 and a gland 4 for sealing a pump shaft 1. The dynamic ring 2, the static ring 3 and the gland 4 are mounted on the outside of the sealing pump shaft 1, and the gland 4 is mounted on the outside of the dynamic ring 2 and the static ring 3; a sealing assembly is provided between the dynamic ring 2 and the gland 4, and the sealing assembly comprises a convex ring 21, a first sealing ring 6 and an air supply pipe 5. The convex ring 21 is mounted on the outer surface of the dynamic ring 2, and the convex ring 21 and the dynamic ring 2 are welded into an integral structure. A sealing bladder 61 is provided inside the first sealing ring 6, and one end of the air supply pipe 5 embedded in the first sealing ring 6 is connected to the sealing bladder 61, and the air supply pipe 5 is connected to the sealing bladder 61 The end of the air delivery pipe 5 protruding from the pressure cover 4 is provided with an air nozzle, and an external conventional inflation device inflates air from the air nozzle to expand the sealing fetal bladder 61, and the expanded sealing fetal bladder 61 fills the sealing groove 211 of the convex ring 21, so that the convex ring 21 and the first sealing ring 6 are sealed. When the dynamic ring 2 and the convex ring 21 rotate for a long time, causing the sealing gap between the convex ring 21 and the first sealing ring 6 to increase, the air is inflated to expand the sealing fetal bladder 61 and reduce the sealing gap. The outer side of the dynamic ring 2 is provided with an outer sealing ring 7, an inner sealing ring 8 and a sealing ring 9. The outer sealing ring 7 and the inner sealing ring 8 are distributed on both sides of the convex ring 21. The outer sealing ring 7, the inner sealing ring 8 and the sealing ring 9 play an auxiliary sealing role.

[0023] In this embodiment, an annular sealing groove 211 is provided in the middle of the outer surface of the dynamic ring 2 . The sealing bladder 61 fits in the sealing groove 211 . The sealing bladder 61 is expanded by inflation to seal the convex ring 21 and the first sealing ring 6 .

[0024] In this embodiment, a first annular groove is provided in the middle position of the inner surface of the first sealing ring 6, and the sealed fetal sac 61 passes through the first annular groove. A channel for the air pipe 5 to pass through is provided on the pressure cover 4. The interior of the air pipe 5 is connected with the interior of the sealed fetal sac 61, which is conducive to the expansion of the sealed fetal sac 61.

[0025] In this embodiment, the outer sealing ring 7, the inner sealing ring 8 and the sealing ring 9 are parallel, the opposite surfaces of the outer sealing ring 7 and the sealing ring 9 are matched, the outer sealing ring 7 and the sealing ring 9 are sealed, and the center of the outer sealing ring 7 and the center of the dynamic ring 2 are on the same axis.

[0026] In this embodiment, a second sealing ring 71 and a second ring groove are provided in the middle position of the inner surface of the outer sealing ring 7. The second sealing ring 71 is located in the second ring groove. The inner diameters of the outer sealing ring 7 and the second sealing ring 71 are the same. The inner diameter of the outer sealing ring 7 is the same as the outer diameter of the dynamic ring 2. A third sealing ring 72 is provided on the surface of the outer sealing ring 7 facing the convex ring 21. The center of the third sealing ring 72 is on the same axis as the center of the dynamic ring 2. The inner diameter of the third sealing ring 72 is the same as the outer diameter of the dynamic ring 2. The second sealing ring 71 and the third sealing ring 72 play the role of sealing the outer surface of the dynamic ring 2. The outer sealing ring 7 is the same as the inner sealing ring 8.

[0027] To sum up: the end of the air delivery pipe 5 protruding from the pressure cover 4 is provided with an air nozzle, and an external conventional inflation device inflates air from the air nozzle to expand the sealing fetal sac 61, and the expanded sealing fetal sac 61 fills the sealing groove 211 of the convex ring 21, so that the convex ring 21 and the first sealing ring 6 are sealed. When the dynamic ring 2 and the convex ring 21 rotate for a long time, causing the sealing gap between the convex ring 21 and the first sealing ring 6 to increase, the air is inflated to expand the sealing fetal sac 61, thereby reducing the sealing gap.

[0028] Although embodiments of the present invention have been shown and described (see the detailed description above for details), it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mechanical seal structure for a pump, comprising a dynamic ring (2), a static ring (3) and a gland (4) for sealing a pump shaft (1), characterized in that: A sealing assembly is provided between the moving ring (2) and the gland (4), and the sealing assembly comprises a convex ring (21), a first sealing ring (6) and an air delivery pipe (5); the convex ring (21) is mounted on the outer surface of the moving ring (2); a sealing bladder (61) is provided inside the first sealing ring (6); one end of the air delivery pipe (5) embedded in the first sealing ring (6) is connected to the sealing bladder (61); an outer sealing ring (7), an inner sealing ring (8) and a sealing ring (9) are provided on the outer side of the moving ring (2); the outer sealing ring (7) and the inner sealing ring (8) are distributed on both sides of the convex ring (21).

2. A mechanical seal structure for a pump according to claim 1, characterized in that: An annular sealing groove (211) is provided in the middle of the outer surface of the moving ring (2), and the sealing fetal bag (61) is adapted to the sealing groove (211).

3. A mechanical seal structure for a pump according to claim 1, characterized in that: A first annular groove is provided in the middle of the inner surface of the first sealing ring (6), and the sealing fetal bag (61) passes through the first annular groove.

4. A mechanical seal structure for a pump according to claim 1, characterized in that: The gland (4) is provided with a passage for the air delivery pipe (5) to pass through, and the interior of the air delivery pipe (5) is communicated with the interior of the sealed fetal sac (61).

5. A mechanical seal structure for a pump according to claim 1, characterized in that: The outer sealing ring (7), the inner sealing ring (8) and the sealing ring (9) are parallel, the opposite surfaces of the outer sealing ring (7) and the sealing ring (9) are matched, and the center of the outer sealing ring (7) and the center of the moving ring (2) are on the same axis.

6. A mechanical seal structure for a pump according to claim 1, characterized in that: A second sealing ring (71) and a second ring groove are provided in the middle of the inner surface of the outer sealing ring (7), the second sealing ring (71) is located in the second ring groove, the inner diameters of the outer sealing ring (7) and the second sealing ring (71) are the same, and the inner diameter of the outer sealing ring (7) is the same as the outer diameter of the moving ring (2).

7. A mechanical seal structure for a pump according to claim 1, characterized in that: A third sealing ring (72) is provided on the surface of the outer sealing ring (7) facing the convex ring (21); the center of the third sealing ring (72) and the center of the moving ring (2) are on the same axis; and the inner diameter of the third sealing ring (72) is the same as the outer diameter of the moving ring (2).

Images