Mechanical seal for centrifugal pump

Abstract

The utility model discloses a mechanical seal for a centrifugal pump. The mechanical seal comprises an outer sleeve sealing shell, an embedded sealing inner shell and an external locking connection platform. The utility model relates to the technical field of centrifugal pump sealing assistance, in particular to a mechanical sealing system, which realizes an accurate and uninterrupted self-cleaning function of joining gaps among an embedded sealing inner shell, a middle section inner shell and a tail section inner shell through an ingenious self-cleaning brushing spinning structure design. According to the mechanism, natural kinetic energy of liquid or gas flowing in the pump body is ingeniously utilized and converted into continuous self-cleaning power, so that long-term stable operation of mechanical sealing is guaranteed, in addition, the self-cleaning mechanism greatly reduces maintenance cost, improves operation efficiency and reliability of the whole system, and has good application prospects. And remarkable economic benefits are brought to users.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pump sealing auxiliary technology, specifically a mechanical seal for centrifugal pumps. Background Technology

[0002] A centrifugal pump is a pump that uses the centrifugal force generated by the rotation of an impeller to transport liquids. Specifically, the working principle of a centrifugal pump is as follows: Before starting, the pump casing and suction pipe must be filled with water. Then, the motor is started, causing the pump shaft to drive the impeller and water to rotate at high speed. At this time, the water undergoes centrifugal motion and is thrown towards the outer edge of the impeller, flowing into the pump's discharge pipe through the flow channel of the volute casing, thus achieving the purpose of transporting liquid. Mechanical seals can meet the sealing performance requirements. In rotating equipment, if no sealing device is installed between the pump casing and the shaft, the medium will flow directly out from that point. If the medium is toxic or harmful, there will be safety issues. Mechanical seals can more effectively prevent leakage of the transported medium, ensuring the safety of equipment and operators. At the same time, mechanical seals can improve working efficiency. Mechanical seals are an extremely important component of centrifugal pumps. Their good sealing performance can prevent losses and pollution caused by medium leakage, thereby improving the working efficiency of the centrifugal pump. Mechanical seals can adapt to special media, and are suitable for transporting... For centrifugal pumps carrying special acidic or alkaline media and chemical liquids, mechanical seals can prevent losses and pollution caused by media leakage, ensuring the normal operation of the centrifugal pump. However, in the operation of most centrifugal pumps, the gaps and joints of the mechanical seal often become accumulation points for transported material particles. Over time, these accumulated particles may not only cause a decline in the performance of the mechanical seal structure, but may also cause irreversible damage, leading to serious problems such as leakage. To effectively address this challenge, we urgently need an innovative mechanical seal structure design to ensure the efficient, stable, and safe operation of the centrifugal pump. While existing technologies may already offer solutions to the above problems, this application aims to provide an alternative or replacement technical solution. Utility Model Content

[0003] To achieve the above objectives, this utility model is implemented through the following technical solution: a mechanical seal for a centrifugal pump, comprising: an outer sealing shell, an inner sealing shell, and an external locking connection platform, wherein the inner sealing shell is inserted into the outer sealing shell, and the external locking connection platform is installed on the outer sealing shell by a plurality of spring-loaded locking components, and a self-cleaning brush-driven self-rotating structure is installed inside the inner sealing shell;

[0004] The self-cleaning brush-driven spin structure includes: a middle inner shell, a terminal inner shell, a pair of sealing ring keys, several moving beads attached to the keys, a pair of embedded cleaning bearings, a driving inner cylinder, an outer brush layer, and several inner cylinder driving grooves.

[0005] The middle section inner shell is inserted into the outer sealing shell and connected to the embedded sealing inner shell. The end section inner shell is inserted into the outer sealing shell and connected to the middle section inner shell. A pair of key coupling grooves are respectively provided on the embedded sealing inner shell and the middle section inner shell. A pair of sealing ring keys are respectively installed on the middle section inner shell and the end section inner shell, and the pair of sealing ring keys are respectively connected to the embedded sealing inner shell and the middle section inner shell through a pair of key coupling grooves. A plurality of key-attached moving balls are respectively installed on a pair of sealing ring keys. A pair of embedded cleaning bearings are respectively installed in the embedded sealing inner shell and the end section inner shell, and the pair of embedded cleaning bearings are respectively connected to the driving inner cylinder and the outer brush layer. The outer brush layer is respectively connected to the inner side of the embedded sealing inner shell, the middle section inner shell and the end section inner shell. A plurality of inner cylinder driving grooves are respectively provided on the driving inner cylinder.

[0006] It should be noted that, as described above, the pump body connection interface on the outer sealing shell is connected to the centrifugal pump, and the external interface on the inner sealing shell is connected to the connecting pipe. When liquid or gas flows into the inner sealing shell through the centrifugal pump, the impact force of the flow will impact the multiple inner cylinder drive grooves opened inside the drive cylinder. Because the inner cylinder drive grooves are arc-shaped grooves, under the impact flow of gas or liquid, the drive cylinder will be driven to rotate by a pair of embedded cleaning bearings. This causes the outer brush layer to continuously rotate at the gaps between the inner sealing shell, the middle inner shell, and the final inner shell. Therefore, a small amount of overflowing liquid or gas residue will be brushed and move towards the pipeline along with the flowing liquid or gas, thus ensuring the stable operation of the entire mechanical seal structure. The sealing ring key, in conjunction with multiple key-mounted moving balls, ensures that the entire mechanical seal structure remains functional even when connected to a dynamically rotating pipeline, significantly enhancing its applicability. The labyrinth seal channels on the sealing ring key (a labyrinth seal consists of several sequentially arranged annular sealing teeth around rotating parts (such as shafts), forming a series of flow-blocking gaps and expansion cavities; when the sealed medium passes through these labyrinthine gaps, a throttling effect is generated, thus achieving leakage prevention) further guarantee the sealing effect of the entire mechanical seal device while the connected pipeline rotates. The connecting retaining flange on the outer sealing shell facilitates the placement of the mechanical seal structure in a suitable position for convenient operation.

[0007] Preferably, the spring-loaded locking assembly includes: a connecting bolt, a pressure-applying auxiliary spring, and a locking nut;

[0008] The connecting bolts are respectively inserted into the outer sealing housing and the external locking connecting platform. The pressure auxiliary spring is sleeved on the outside of the connecting bolt and is connected to the outer sealing housing and the external locking connecting platform respectively. The locking nut is installed on the connecting bolt and is connected to the external locking connecting platform.

[0009] It should be noted that, as described above, the pressure-applying auxiliary spring applies pressure to both the outer sealing shell and the external locking connection platform. The external locking connection platform is then fixedly installed together with the inner sealing shell. The locking nut locks the connection bolt and the external locking connection platform. In summary, the outer sealing shell and the inner sealing shell are tightly joined together by the components.

[0010] Preferably, the outer sealing housing is provided with a connecting retaining flange;

[0011] Preferably, the outer sealing housing is provided with a pump body connection interface;

[0012] Preferably, the embedded sealed inner shell is provided with an external interface;

[0013] Preferably, the sealing ring key is provided with a labyrinth sealing groove. Beneficial effects

[0014] This invention provides a mechanical seal for centrifugal pumps. Compared to existing technologies, this mechanical seal system, through its ingenious self-cleaning brush-driven spin structure design, achieves precise and continuous self-cleaning of the gaps between the inner sealing shell, the middle inner shell, and the final inner shell. This mechanism cleverly utilizes the natural kinetic energy of the liquid or gas flowing within the pump body, converting it into continuous self-cleaning power, thereby ensuring the long-term stable operation of the mechanical seal. Furthermore, this self-cleaning mechanism significantly reduces maintenance costs, improves the overall system's operating efficiency and reliability, and brings significant economic benefits to users. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main cross-sectional structure of a mechanical seal for a centrifugal pump according to the present invention.

[0016] Figure 2 This is a side sectional view of the inner sealing shell of the mechanical seal for a centrifugal pump according to the present invention.

[0017] Figure 3 for Figure 1 A magnified view of the letter "A" in the diagram.

[0018] In the diagram: 1. Outer sealing shell; 2. Inner sealing shell; 3. External locking connection platform; 4. Middle section inner shell; 5. End section inner shell; 6. Sealing ring key; 7. Moving ball attached to the key; 8. Inner cleaning bearing; 9. Drive inner cylinder; 10. Outer brush layer; 11. Inner cylinder drive groove; 12. Connecting bolt; 13. Pressure auxiliary spring; 14. Locking nut. Detailed Implementation

[0019] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] Those skilled in the art should connect all electrical components and their compatible power supplies in this case via wires. Appropriate controllers and encoders should be selected according to the actual situation to meet control requirements. The specific connection and control sequence should refer to the working principle described below, where the electrical components are connected in sequence. The detailed connection methods are well-known in the art. The following mainly introduces the working principle and process, and will not describe the electrical control further. Example

[0021] The present invention will now be described in detail with reference to the accompanying drawings, such as... Figure 1-3As shown, a mechanical seal for a centrifugal pump includes: an outer sealing housing 1, an inner sealing housing 2, and an external locking platform 3. The inner sealing housing 2 is inserted into the outer sealing housing 1. The external locking platform 3 is mounted on the outer sealing housing 1 by a plurality of spring-loaded locking components. A self-cleaning brush-driven rotating structure is installed inside the inner sealing housing 2. The self-cleaning brush-driven rotating structure includes: a middle inner housing 4, a terminal inner housing 5, a pair of sealing ring keys 6, a plurality of key-attached moving balls 7, a pair of embedded cleaning bearings 8, and a drive inner cylinder 9. The cylinder has an outer brush layer 10 and several inner cylinder drive grooves 11; the middle section inner shell 4 is inserted into the outer sealing shell 1, and the middle section inner shell 4 is connected to the embedded sealing inner shell 2; the end section inner shell 5 is inserted into the outer sealing shell 1, and the end section inner shell 5 is connected to the middle section inner shell 4; a pair of key coupling grooves are respectively provided on the embedded sealing inner shell 2 and the middle section inner shell 4; a pair of sealing ring keys 6 are respectively installed on the middle section inner shell 4 and the end section inner shell 5, and the pair of sealing ring keys 6 are respectively coupled by a pair of key bodies. The groove is connected to the embedded sealing inner shell 2 and the middle section inner shell 4. Several key-mounted moving balls 7 are respectively installed on a pair of sealing ring keys 6. A pair of embedded cleaning bearings 8 are respectively installed inside the embedded sealing inner shell 2 and the final section inner shell 5, and the pair of embedded cleaning bearings 8 are respectively connected to the driving inner cylinder 9 and the outer brush layer 10. The outer brush layer 10 is respectively connected to the inner side of the embedded sealing inner shell 2, the middle section inner shell 4, and the final section inner shell 5. Several inner cylinders are respectively provided on the driving inner cylinder 9. The drive groove 11; the spring-loaded locking assembly includes: a connecting bolt 12, a pressure-applying auxiliary spring 13, and a locking nut 14; the connecting bolt 12 is respectively inserted into the outer sealing housing 1 and the external locking connection platform 3, the pressure-applying auxiliary spring 13 is fitted on the outside of the connecting bolt 12, and the pressure-applying auxiliary spring 13 is respectively connected to the outer sealing housing 1 and the external locking connection platform 3, the locking nut 14 is installed on the connecting bolt 12, and the locking nut 14 is connected to the external locking connection platform 3.

[0022] According to the appendix Figure 1-3It is concluded that the centrifugal pump is connected via the pump body connection interface on the outer sealing shell 1, and the connecting pipe is connected via the external interface on the inner sealing shell 2. When liquid or gas flows into the inner sealing shell 2 through the centrifugal pump, the impact force of the flow will impact the multiple inner cylinder drive grooves 11 opened in the drive inner cylinder 9. Because the inner cylinder drive grooves 11 are arc-shaped grooves, under the impact flow of gas or liquid, the drive inner cylinder 9 will be driven to rotate by a pair of embedded cleaning bearings 8. This causes the outer brush layer 10 to continuously rotate at the gaps between the inner sealing shell 2, the middle inner shell 4, and the final inner shell 5. Therefore, a small amount of overflowing liquid or gas residue will be brushed and move towards the pipeline along with the flowing liquid or gas, thus ensuring the stable operation of the entire mechanical seal structure. The sealing ring key 6, together with multiple moving beads 7 attached to it, ensures that the entire mechanical seal structure will not be affected even if the external pipeline is a dynamically rotating pipeline. This greatly improves the applicability of the entire sealing structure. The labyrinth sealing channel set on the sealing ring key 6 (the labyrinth seal is a series of sequentially arranged annular sealing teeth set around the rotating parts (such as the shaft). These teeth form a series of intercepting gaps and expansion cavities. When the sealed medium passes through these tortuous labyrinth gaps, a throttling effect is generated, thereby achieving the purpose of preventing leakage) can further ensure the sealing effect of the entire mechanical seal device while ensuring the rotation of the connecting pipe. The connecting retaining flange set on the outer sealing shell 1 makes it convenient to place the mechanical seal structure in a suitable position for easy operation. The pressure auxiliary spring 13 will simultaneously apply pressure to the outer sealing shell 1 and the external locking connecting platform 3. The external locking connecting platform 3 is fixedly installed together with the inner sealing shell 2. The locking nut 14 will lock the connecting bolt 12 and the external locking connecting platform 3. In summary, the outer sealing shell 1 and the inner sealing shell 2 will be tightly combined by the components.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mechanical seal for a centrifugal pump, comprising: The outer sealing shell (1), the inner sealing shell (2), and the external locking connection platform (3) are characterized in that the inner sealing shell (2) is inserted into the outer sealing shell (1), the external locking connection platform (3) is installed on the outer sealing shell (1) by a number of spring-loaded locking components, and a self-cleaning brush-driven self-rotating structure is installed in the inner sealing shell (2). The self-cleaning brush-driven spin structure includes: a middle inner shell (4), a terminal inner shell (5), a pair of sealing ring keys (6), several key-attached moving beads (7), a pair of embedded cleaning bearings (8), a driving inner cylinder (9), an outer brush layer (10), and several inner cylinder driving grooves (11). The middle section inner shell (4) is inserted into the outer sealing shell (1) and is connected to the embedded sealing inner shell (2). The end section inner shell (5) is inserted into the outer sealing shell (1) and is connected to the middle section inner shell (4). A pair of key coupling grooves are respectively provided on the embedded sealing inner shell (2) and the middle section inner shell (4). A pair of sealing ring keys (6) are respectively installed on the middle section inner shell (4) and the end section inner shell (5), and the pair of sealing ring keys (6) are respectively connected to the embedded sealing inner shell (2) through a pair of key coupling grooves. And connected to the middle section inner shell (4), a number of key-attached moving balls (7) are respectively installed on a pair of sealing ring keys (6), a pair of embedded cleaning bearings (8) are respectively installed in the embedded sealing inner shell (2) and the end section inner shell (5), and the pair of embedded cleaning bearings (8) are respectively connected to the driving inner cylinder (9) and the outer brush layer (10), the outer brush layer (10) is respectively connected to the inner side of the embedded sealing inner shell (2), the middle section inner shell (4) and the end section inner shell (5), and a number of inner cylinder driving grooves (11) are respectively opened on the driving inner cylinder (9).

2. A mechanical seal for a centrifugal pump according to claim 1, characterized in that, The spring-loaded locking assembly includes: a connecting bolt (12), a pressure-applying auxiliary spring (13), and a locking nut (14). The connecting bolt (12) is respectively inserted into the outer sealing housing (1) and the external locking connecting platform (3). The pressure auxiliary spring (13) is fitted on the outside of the connecting bolt (12) and is connected to the outer sealing housing (1) and the external locking connecting platform (3). The locking nut (14) is installed on the connecting bolt (12) and is connected to the external locking connecting platform (3).

3. A mechanical seal for a centrifugal pump according to claim 2, characterized in that, The outer sealing housing (1) is provided with a connecting retaining flange.

4. A mechanical seal for a centrifugal pump according to claim 3, characterized in that, The outer sealing housing (1) is provided with a pump body connection interface.

5. A mechanical seal for a centrifugal pump according to claim 4, characterized in that, An external interface is provided on the embedded sealed inner shell (2).

6. A mechanical seal for a centrifugal pump according to claim 5, characterized in that, The sealing ring key (6) is provided with a labyrinth sealing groove.

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