Medium-pressure mechanical sealing structure for centrifugal pump

Abstract

The utility model discloses a medium-pressure mechanical seal structure for a centrifugal pump, which relates to the technical field of centrifugal pumps and particularly comprises a mechanical seal seat and a gland, a movable ring component is arranged in an inner cavity of the mechanical seal seat, a first magnet ring is fixedly connected onto the movable ring component, a sealing concave ring is arranged on the inner side of the top of the movable ring component, and a second magnet ring is fixedly connected onto the gland. A static ring assembly is arranged in an inner cavity of the gland and comprises an isolation pad fixedly connected with the inner wall of the gland, and a static ring is fixedly connected with an inner cavity of the isolation pad. According to the medium-pressure mechanical sealing structure for the centrifugal pump, through the arrangement of the first magnet ring and the second magnet ring, the first magnet ring can drive the second magnet ring to move when moving, the second magnet ring can drive the static ring to extrude the isolation pad when moving, the position of the static ring can be changed along with the position of the movable ring, and therefore when the centrifugal pump shakes, the static ring can extrude the isolation pad. And the positions of the static ring and the moving ring in the vertical direction can be kept unchanged, so that the static ring and the moving ring can be uniformly abraded, and the sealing performance of the sealing structure is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal pumps, in particular to a medium-pressure mechanical seal structure for a centrifugal pump. Background Art

[0002] Centrifugal pumps operate by centrifugally moving water through the rotation of the impeller. Before starting the pump, the pump casing and suction pipe must be filled with water. The motor is then started, causing the pump shaft to spin the impeller and water at high speed. This centrifugal motion causes the water to be flung toward the outer edge of the impeller, flowing through the flow channel of the volute pump casing into the pump's pressure water line. Mechanical seals are often used to prevent leakage during operation, and the effectiveness of these seals plays a decisive role in the pump's stability, service life, and operating costs.

[0003] In the related art, a mechanical seal structure typically includes a stationary ring, a dynamic ring, a transmission sleeve, and a spring. The stationary ring is fixed in the mechanical seal seat, and the transmission sleeve is fixed to the pump shaft. A set of springs is installed in the transmission sleeve. This set of springs presses the dynamic ring against the stationary ring to provide a seal. During operation, a centrifugal pump vibrates, which can easily lead to uneven wear between the stationary and dynamic rings. Furthermore, since there is usually only one contact surface between the dynamic and stationary rings, the mechanical seal structure is prone to leakage when uneven wear occurs on the contact surface. Based on this, the present application proposes a medium-pressure mechanical seal structure for a centrifugal pump. Utility Model Content

[0004] The utility model provides a medium-pressure mechanical seal structure for a centrifugal pump, which solves the problems proposed in the above-mentioned background technology that there is only one contact surface between the dynamic ring and the static ring, which is prone to leakage, and the jitter generated when the centrifugal pump is working easily causes uneven wear between the static ring and the dynamic ring.

[0005] The utility model provides the following technical solutions: a medium-pressure mechanical seal structure for a centrifugal pump, comprising a machine seal seat and a pressure cover, a dynamic ring assembly is provided in the inner cavity of the machine seal seat, a magnet ring 1 is fixedly connected to the dynamic ring assembly, a sealing concave ring is provided on the inner side of the top of the dynamic ring assembly, a static ring assembly is provided in the inner cavity of the pressure cover, the static ring assembly comprises an isolation pad fixedly connected to the inner wall of the pressure cover, the inner cavity of the isolation pad is fixedly connected to the static ring, the bottom of the static ring is tightly fitted with the top of the dynamic ring assembly, the inner cavity of the static ring is fixedly connected to a sealing convex ring, the bottom end of the sealing convex ring is adapted to the sealing concave ring, the top of the static ring is provided with a movable groove, the inner cavity of the movable groove is movably connected to a magnet ring 2, and the magnet ring 1 and the magnet ring 2 are magnetically attracted to each other.

[0006] Preferably, heat conducting sheets are fixed on the surface of the sealing concave ring and the surface of the sealing convex ring.

[0007] Preferably, the dynamic ring assembly includes a spring, the bottom of the spring is fixedly connected to the inner cavity of the machine seal seat, the top of the spring is fixedly connected to the dynamic ring sealing ring, the dynamic ring sealing ring is movably connected to the inner cavity of the machine seal seat, the top of the horizontal end of the dynamic ring sealing ring is fixedly connected to the dynamic ring and magnet ring 1, the magnet ring 1 is located in the inner cavity of the dynamic ring, a sealing ring is provided between the top of the vertical end of the dynamic ring sealing ring and the dynamic ring, and the inner side of the top of the dynamic ring is fixedly connected to a sealing concave ring.

[0008] Preferably, the inner diameter of the sealing concave ring is not larger than the inner diameter of the dynamic ring sealing ring, and the inner diameter of the sealing convex ring is smaller than the inner diameter of the dynamic ring sealing ring.

[0009] Preferably, the second magnet ring is in rolling contact with the inner wall of the movable groove, and the top, bottom, outer wall and inner wall of the second magnet ring are all provided with rolling components.

[0010] Preferably, the magnet ring 1 is located directly below the magnet ring 2, and the size of the magnet ring 1 is the same as that of the magnet ring 2.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The centrifugal pump uses a medium-pressure mechanical seal structure. Through the arrangement of magnet ring 1 and magnet ring 2, when magnet ring 1 moves, it can drive magnet ring 2 to move. When magnet ring 2 moves, it can drive the static ring to squeeze the isolation pad. The position of the static ring can change with the position of the dynamic ring. As a result, when the centrifugal pump shakes, the vertical positions of the static ring and the dynamic ring can remain unchanged, so that the static ring and the dynamic ring can wear evenly, thereby ensuring the sealing performance of the sealing structure.

[0013] 2. The medium-pressure mechanical seal structure used in the centrifugal pump increases the contact area between the dynamic ring assembly and the static ring assembly by setting a sealing convex ring and a sealing concave ring, reduces the probability of leakage on the contact surface, and makes the contact surface of the dynamic ring assembly and the static ring assembly form a maze structure, thereby improving the sealing performance of the sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a front view of the structure of the utility model;

[0015] Figure 2 For the utility model structure Figure 1 Explosion diagram;

[0016] Figure 3 For the utility model structure Figure 2 Schematic diagram looking up;

[0017] Figure 4 For the utility model structure Figure 1 Schematic cross-section;

[0018] Figure 5 This is a schematic diagram of the explosion of the static ring structure of the utility model;

[0019] Figure 6 This is a schematic diagram of the connection between the structure of the utility model and the pump shaft of a centrifugal pump.

[0020] In the figure: 1. Machine seal seat; 2. Pressure cover; 3. Dynamic ring; 4. Static ring; 5. Sealing concave ring; 6. Isolation pad; 7. Sealing convex ring; 8. Magnet ring 2; 9. Magnet ring 1; 10. Dynamic ring seal; 11. Spring; 12. Sealing ring. DETAILED DESCRIPTION

[0021] The following will be combined with the 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.

[0022] The utility model provides a medium-pressure mechanical seal structure for a centrifugal pump, comprising a mechanical seal seat 1 and a pressure cover 2. A dynamic ring assembly is provided in the inner cavity of the mechanical seal seat 1. The dynamic ring assembly includes a spring 11. The bottom of the spring 11 is fixedly connected to the inner cavity of the mechanical seal seat 1. The top of the spring 11 is fixedly connected to a dynamic ring sealing ring 10. The dynamic ring sealing ring 10 is movably connected to the inner cavity of the mechanical seal seat 1. The top of the horizontal end of the dynamic ring sealing ring 10 is fixedly connected to a dynamic ring 3 and a magnet ring 9. The magnet ring 9 is located in the inner cavity of the dynamic ring 3. A sealing ring 12 is provided between the top of the vertical end of the dynamic ring sealing ring 10 and the dynamic ring 3. A sealing concave ring 5 is fixedly connected to the inner side of the top of the dynamic ring 3. The inner diameter of the sealing concave ring 5 is not larger than the inner diameter of the dynamic ring sealing ring 10. The inner diameter of the sealing concave ring 5 can be set according to demand and is not limited here.

[0023] A stationary ring assembly is located within the inner cavity of gland 2. This assembly includes an isolation gasket 6 fixedly connected to the inner wall of gland 2. The inner cavity of isolation gasket 6 is fixedly connected to the stationary ring 4. This sealing structure allows the bottom of stationary ring 4 to fit tightly against the top of dynamic ring 3 during use. A sealing convex ring 7 is fixedly connected to the inner cavity of static ring 4. The bottom end of sealing convex ring 7 fits within sealing concave ring 5. The inner diameter of sealing convex ring 7 is smaller than that of dynamic ring seal 10. The inner diameter of sealing convex ring 7 can be adjusted as needed and is not a limitation here.

[0024] By setting the sealing convex ring 7 and the sealing concave ring 5, the contact area between the dynamic ring assembly and the static ring assembly is increased, the probability of leakage on the contact surface is reduced, and the contact surface between the dynamic ring assembly and the static ring assembly forms a maze structure, thereby improving the sealing performance of the sealing structure.

[0025] The surface of the sealing concave ring 5 and the surface of the sealing convex ring 7 are fixed with heat conducting sheets. Through the setting of the heat conducting sheets, the heat generated by the friction between the dynamic ring assembly and the static ring assembly can be quickly transferred to facilitate the heat dissipation of the contact area. The heat conducting sheet can be made of graphene.

[0026] The top of the stationary ring 4 is provided with a movable groove, within which magnet ring 2 8 is movably connected. Magnet ring 1 9 is located directly below magnet ring 2 8 and has the same dimensions as magnet ring 2 8. Magnet ring 1 9 and magnet ring 2 8 are magnetically attracted to each other. The arrangement of magnet ring 1 9 and magnet ring 2 8 allows magnet ring 1 9 to move, which in turn drives the stationary ring 4 to press against the isolation pad 6. The position of the stationary ring 4 changes with the position of the dynamic ring 3. This allows the vertical position of the stationary ring 4 and the dynamic ring 3 to remain unchanged during vibration, ensuring uniform wear of the two rings, thereby ensuring the sealing performance of the sealing structure. The isolation pad 6 is made of a flexible material, such as rubber.

[0027] Magnet ring 2 (8) rolls against the inner wall of the movable groove. Rolling assemblies, such as ball bearings, are located on the top, bottom, outer, and inner walls of magnet ring 2 (8). The rolling assemblies reduce friction between magnet ring 2 (8) and stationary ring 4, facilitating rotation of magnet ring 2 (8).

[0028] The materials of both the magnet ring 1 9 and the magnet ring 2 8 can be permanent magnets, and the static ring 4 and the pressure cover 2 are both made of non-ferromagnetic materials.

[0029] In summary: When the centrifugal pump is used with a medium-pressure mechanical seal structure, the connection diagram with the centrifugal pump shaft is as shown in the attached manual. Figure 6 As shown, when the pump shaft of the centrifugal pump rotates, it can drive the mechanical seal seat 1 to rotate, and the mechanical seal seat 1 drives the dynamic ring 3 to rotate. Under the action of the thrust of the spring 11, the dynamic ring 3 is tightly fitted with the static ring 4, and the sealing concave ring 5 is tightly fitted with the sealing convex ring. The contact surface of the dynamic ring assembly and the static ring assembly forms a maze structure, which improves the sealing performance of the sealing structure. When the dynamic ring assembly moves, the dynamic ring assembly drives the magnet ring 1 9 to move, the magnet ring 1 9 drives the magnet ring 2 8 to move, and the magnet ring 2 8 drives the static ring 4 to squeeze the isolation pad 6, so that the positions of the static ring 4 and the dynamic ring 3 in the vertical direction can remain unchanged, so that the static ring 4 and the dynamic ring 3 can be evenly worn, thereby ensuring the sealing of the contact area and extending the service life of the sealing structure.

[0030] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology and will not be described in detail here. The content not described in detail in this specification belongs to the existing technology known to professional and technical personnel in this field. Although the embodiments of the present invention have been shown and described, it can be understood by ordinary technicians in this field that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A medium-pressure mechanical seal structure for a centrifugal pump, comprising a mechanical seal seat (1) and a gland (2), characterized in that: A dynamic ring assembly is provided in the inner cavity of the mechanical seal seat (1), a magnet ring 1 (9) is fixedly connected to the dynamic ring assembly, a sealing concave ring (5) is provided on the inner side of the top of the dynamic ring assembly, a static ring assembly is provided in the inner cavity of the pressure cover (2), the static ring assembly includes an isolation pad (6) fixedly connected to the inner wall of the pressure cover (2), the inner cavity of the isolation pad (6) is fixedly connected to a static ring (4), the bottom of the static ring (4) is tightly fitted with the top of the dynamic ring assembly, the inner cavity of the static ring (4) is fixedly connected to a sealing convex ring (7), the bottom end of the sealing convex ring (7) is adapted to the sealing concave ring (5), the top of the static ring (4) is provided with a movable groove, the inner cavity of the movable groove is movably connected to a magnet ring 2 (8), and the magnet ring 1 (9) and the magnet ring 2 (8) are magnetically attracted to each other.

2. A medium-pressure mechanical seal structure for a centrifugal pump according to claim 1, characterized in that: Heat conducting sheets are fixed on the surface of the sealing concave ring (5) and the surface of the sealing convex ring (7).

3. A medium-pressure mechanical seal structure for a centrifugal pump according to claim 1, characterized in that: The dynamic ring assembly includes a spring (11), the bottom of the spring (11) is fixedly connected to the inner cavity of the machine seal seat (1), the top of the spring (11) is fixedly connected to the dynamic ring sealing ring (10), the dynamic ring sealing ring (10) is movably connected to the inner cavity of the machine seal seat (1), the top of the horizontal end of the dynamic ring sealing ring (10) is fixedly connected to the dynamic ring (3) and the magnet ring (9), the magnet ring (9) is located in the inner cavity of the dynamic ring (3), a sealing ring (12) is provided between the top of the vertical end of the dynamic ring sealing ring (10) and the dynamic ring (3), and the inner side of the top of the dynamic ring (3) is fixedly connected to the sealing concave ring (5).

4. A medium-pressure mechanical seal structure for a centrifugal pump according to claim 1, characterized in that: The inner diameter of the sealing concave ring (5) is not greater than the inner diameter of the dynamic ring sealing ring (10), and the inner diameter of the sealing convex ring (7) is smaller than the inner diameter of the dynamic ring sealing ring (10).

5. The medium-pressure mechanical seal structure for a centrifugal pump according to claim 1, characterized in that: The second magnet ring (8) is in rolling contact with the inner wall of the movable groove, and the top, bottom, outer side wall and inner side wall of the second magnet ring (8) are all provided with rolling components.

6. The medium-pressure mechanical seal structure for a centrifugal pump according to claim 1, characterized in that: The magnet ring one (9) is located directly below the magnet ring two (8), and the size of the magnet ring one (9) is the same as that of the magnet ring two (8).

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