Sealing structure of shield pump

Abstract

The utility model relates to the technical field of shield pumps, in particular to a shield pump sealing structure which comprises a shield pump body, a communicating pipe fixedly connected to the surface of the shield pump body and a positioning flange plate fixedly connected to the end face of the communicating pipe. The sealing assembly comprises an outer pipe fixedly sleeving the outer surface of the communicating pipe, and the end face, away from the positioning flange plate, of the outer pipe is fixedly connected with a threaded pipe. By arranging the sealing assembly, after the positioning flange plate and the pipeline flange plate are fixedly connected together, the interior of the sealing cavity can be pressurized by rotating the nut, after the air bag is expanded, the surface of the sealing plate is attached to the pipeline flange plate in a sealed mode, and the connecting position of the positioning flange plate and the pipeline flange plate can be sealed; according to the sealing mode, the sealing plate is evenly stressed, the possibility of abrasion of the sealing plate is reduced, the service life of the sealing plate is prolonged, and the sealing performance is improved.

Description

Technical Field

[0001] This utility model relates to the field of shielded pump technology, specifically to the sealing structure of a shielded pump. Background Technology

[0002] Canned motor pumps utilize magnetic drive technology to achieve a seal-free design, effectively avoiding the risk of liquid leakage, reducing maintenance requirements, and improving overall safety. This type of pump transmits power through magnetic coupling between the drive magnet of an external electric motor and the driven magnet connected to the pump rotor internally. This ensures magnetic isolation between the pump body and the motor, preventing liquid leakage and contamination, making it particularly suitable for handling toxic, corrosive, or high-value liquids.

[0003] However, traditional canned motor pumps typically use flanges for pipeline connections, which can lead to uneven stress on the gaskets. When tightening the tie bolts, if the bolts are not tightened simultaneously, the gaskets may be overcompressed or deformed in some areas, resulting in tearing or breakage. This uneven stress and gasket damage easily cause leakage problems, usually requiring frequent inspection and replacement, increasing maintenance costs and equipment downtime. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a shielded pump sealing structure that can seal the connection between the positioning flange and the pipeline flange. This sealing method ensures uniform stress on the sealing plate, reduces the possibility of wear on the sealing plate, extends the service life of the sealing plate, and improves sealing performance.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a shielded pump sealing structure, including a shielded pump body, a connecting pipe fixedly connected to the surface of the shielded pump body, and a positioning flange fixedly connected to the end face of the connecting pipe, wherein a sealing component is installed at the connection between the connecting pipe and the positioning flange;

[0006] The sealing assembly includes an outer tube fixedly sleeved on the outer surface of the connecting pipe, a threaded tube fixedly connected to the end face of the outer tube away from the positioning flange, a sealing ring slidably connected inside the outer tube, connecting rods fixedly connected at equal intervals on the surface of the sealing ring, a nut threaded on the outer surface of the threaded tube, and an airbag fixedly installed at the top end inside the outer tube.

[0007] Preferably, a sealing cavity is provided inside the outer tube, and limit grooves are provided at equal intervals on the surface of the outer tube away from the positioning flange, and the end face of the outer tube extends to the surface of the positioning flange.

[0008] Preferably, the size and shape of the connecting rod and the limiting groove are matched, and the outer surface of the connecting rod is slidably connected to the inside of the limiting groove.

[0009] Preferably, the end face of the connecting rod is inserted into the inside of the sealing cavity, and the outer surface of the sealing ring is slidably connected to the inside of the sealing cavity.

[0010] Preferably, the interior of the airbag is connected to the interior of the sealing cavity, the surface of the airbag away from the limiting groove is arc-shaped, and a sealing plate is fixedly connected to the surface of the airbag.

[0011] Preferably, a steel ball is movably installed inside the connecting rod, the surface of the steel ball extends to the outside of the connecting rod, and the surface of the steel ball is rolled onto the surface of the nut.

[0012] This utility model has the following beneficial effects:

[0013] This invention, by setting a sealing component, fixes the positioning flange and the pipe flange together. By rotating the nut, pressure can be increased inside the sealing cavity, causing the airbag to expand. The surface of the sealing plate then seals against the pipe flange, sealing the connection between the positioning flange and the pipe flange. This sealing method ensures uniform stress on the sealing plate, reduces the possibility of wear, extends the service life of the sealing plate, and improves sealing performance.

[0014] This invention reduces the friction between the nut and the connecting rod when the nut rotates by incorporating steel balls, thereby increasing the durability of the connecting rod, ensuring the stability of the sealing ring sliding inside the sealing cavity, and guaranteeing sealing performance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram showing the connection between the connecting pipe and the sealing assembly in this utility model;

[0017] Figure 3 This is a schematic diagram of the sealing assembly in this utility model;

[0018] Figure 4 This is a cross-sectional view of the outer tube in this utility model;

[0019] Figure 5 This is a schematic diagram showing the connection between the connecting rod and the steel ball in this utility model.

[0020] In the diagram: 1. Main body of the canned pump; 2. Connecting pipe; 3. Positioning flange; 4. Sealing assembly; 41. Outer pipe; 411. Sealing cavity; 412. Limiting groove; 42. Threaded pipe; 43. Sealing ring; 44. Connecting rod; 441. Steel ball; 45. Nut; 46. Airbag; 461. Sealing plate. Detailed Implementation

[0021] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0022] like Figures 1 to 5 As shown, the shielded pump sealing structure includes a shielded pump body 1, a connecting pipe 2 fixedly connected to the surface of the shielded pump body 1, and a positioning flange 3 fixedly connected to the end face of the connecting pipe 2. A sealing assembly 4 is installed at the connection between the connecting pipe 2 and the positioning flange 3.

[0023] The sealing assembly 4 includes an outer tube 41 fixedly sleeved on the outer surface of the connecting pipe 2. A threaded pipe 42 is fixedly connected to the end face of the outer tube 41 away from the positioning flange 3. A sealing ring 43 is slidably connected inside the outer tube 41. A connecting rod 44 is fixedly connected at equal intervals on the surface of the sealing ring 43. A nut 45 is threadedly installed on the outer surface of the threaded pipe 42. An airbag 46 is fixedly installed at the top end inside the outer tube 41. The inside of the airbag 46 is connected to the inside of the sealing cavity 411. The surface of the airbag 46 away from the limiting groove 412 is arc-shaped, and a sealing plate 461 is fixedly connected to the surface of the airbag 46. A sealing cavity 411 is opened inside the outer tube 41. The end face of the connecting rod 44 is inserted into the inside of the sealing cavity 411. The outer surface of the sealing ring 43 is slidably connected to the inside of the sealing cavity 411. Limiting grooves 412 are opened at equal intervals on the surface of the outer tube 41 away from the positioning flange 3. The size and shape of the connecting rod 44 and the limiting groove 412 are matched.

[0024] The outer surface of the connecting rod 44 is slidably connected to the inside of the limiting groove 412. The end face of the outer tube 41 extends to the surface of the positioning flange 3. After the positioning flange 3 and the pipe flange are fixedly connected by the sealing assembly 4, the sealing cavity 411 can be pressurized by rotating the nut 45. After the airbag 46 expands, the surface of the sealing plate 461 seals against the pipe flange, which can seal the connection between the positioning flange 3 and the pipe flange. This sealing method ensures that the sealing plate 461 is subjected to uniform force, reduces the possibility of wear on the sealing plate 461, extends the service life of the sealing plate 461, and improves the sealing performance.

[0025] A steel ball 441 is movably installed inside the connecting rod 44. The surface of the steel ball 441 extends to the outside of the connecting rod 44, and the surface of the steel ball 441 rolls onto the surface of the nut 45. By setting the steel ball 441, the friction between the nut 45 and the connecting rod 44 when rotating is reduced, the durability of the connecting rod 44 is increased, the stability of the sealing ring 43 sliding inside the sealing cavity 411 is ensured, and the sealing performance is guaranteed.

[0026] During connection, the flange on the external pipe is attached to the surface of the positioning flange 3 and tightened with tie bolts. Then, by rotating the nut 45, the nut 45 drives the connecting rod 44 to slide deeper into the sealing cavity 411 through the steel ball 441. By setting the steel ball 441, the friction between the nut 45 and the connecting rod 44 is reduced when the nut 45 rotates, the durability of the connecting rod 44 is increased, the stability of the sealing ring 43 sliding inside the sealing cavity 411 is ensured, and the sealing performance is guaranteed.

[0027] While the connecting rod 44 moves, the sealing ring 43 slides towards the airbag 46 inside the sealing cavity 411. At this time, the sealing ring 43 and the airbag 46 are under strong pressure. The strong pressure causes the airbag 46 to expand and the surface of the sealing plate 461 to seal against the pipe flange, which can seal the connection between the positioning flange 3 and the pipe flange. This sealing method ensures that the sealing plate 461 is subjected to uniform force, reduces the possibility of wear on the sealing plate 461, extends the service life of the sealing plate 461, and improves the sealing performance.

Claims

1. A canned motor pump sealing structure, comprising a canned motor pump body (1), a connecting pipe (2) fixedly connected to the surface of the canned motor pump body (1), and a positioning flange (3) fixedly connected to the end face of the connecting pipe (2), characterized in that: A sealing assembly (4) is installed at the connection between the connecting pipe (2) and the positioning flange (3); The sealing assembly (4) includes an outer tube (41) fixedly sleeved on the outer surface of the connecting pipe (2), a threaded pipe (42) fixedly connected to the end face of the outer tube (41) away from the positioning flange (3), a sealing ring (43) is slidably connected inside the outer tube (41), a connecting rod (44) is fixedly connected at equal intervals on the surface of the sealing ring (43), a nut (45) is threaded on the outer surface of the threaded pipe (42), and an airbag (46) is fixedly installed at the top end inside the outer tube (41).

2. The shielded pump sealing structure according to claim 1, characterized in that: The outer tube (41) has a sealing cavity (411) inside, and a limiting groove (412) is equidistantly opened on the surface of the outer tube (41) away from the positioning flange (3). The end face of the outer tube (41) extends to the surface of the positioning flange (3).

3. The shielded pump sealing structure according to claim 2, characterized in that: The size and shape of the connecting rod (44) and the limiting groove (412) are matched, and the outer surface of the connecting rod (44) is slidably connected to the inside of the limiting groove (412).

4. The shielded pump sealing structure according to claim 2, characterized in that: The end face of the connecting rod (44) is inserted into the inside of the sealing cavity (411), and the outer surface of the sealing ring (43) is slidably connected to the inside of the sealing cavity (411).

5. The shielded pump sealing structure according to claim 2, characterized in that: The interior of the airbag (46) is connected to the interior of the sealing cavity (411). The surface of the airbag (46) away from the limiting groove (412) is arc-shaped, and a sealing plate (461) is fixedly connected to the surface of the airbag (46).

6. The shielded pump sealing structure according to claim 2, characterized in that: A steel ball (441) is movably mounted inside the connecting rod (44), the surface of the steel ball (441) extends to the outside of the connecting rod (44), and the surface of the steel ball (441) is rolled onto the surface of the nut (45).

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