Centrifugal pump with double-sealing structure for improving efficiency

Abstract

The utility model discloses an efficiency-improving centrifugal pump with a double-sealing structure, which relates to the field of centrifugal pumps and comprises a pump shell, a pump shaft is rotatably mounted in the pump shell, a mechanical sealing component is sleeved on the pump shaft, and a reinforcing sealing component is mounted in a gap between the pump shaft and the pump shell. The reinforced sealing assembly is composed of a rotary U-shaped rubber ring, a fixed U-shaped rubber ring, a sealing insertion ring, a rubber ring, a supporting base ring and an annular rubber air bag, the end face of the rotary U-shaped rubber ring makes contact with the end face of the fixed U-shaped rubber ring, the sealing insertion ring is fixedly installed at one end of the fixed U-shaped rubber ring and inserted into the rotary U-shaped rubber ring at the same time, and the annular rubber air bag is fixed to the supporting base ring. A reinforcing sealing assembly composed of a rotary U-shaped rubber ring, a fixed U-shaped rubber ring, a sealing insertion ring, a rubber ring, a supporting base ring and an annular rubber air bag is additionally arranged in a gap between a pump shaft and a pump shell, so that the sealing performance of the centrifugal pump is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pumps, and in particular to a centrifugal pump with a double-seal structure for improved efficiency. Background Technology

[0002] Centrifugal pumps are commonly used fluid transport equipment in industrial fields, and their sealing performance is crucial to the equipment's operating efficiency, stability, and service life. Most existing centrifugal pumps use a single mechanical seal structure, which has several limitations: when transporting corrosive or volatile media, leaks are prone to occur, polluting the environment, potentially causing safety accidents, and wasting resources; under high temperature and high pressure conditions, the performance of the sealing material changes, increasing the risk of leakage, affecting the continuity and stability of the production system, and increasing production costs.

[0003] Furthermore, with the continuous expansion of industrial production scale, the workload of centrifugal pumps is constantly increasing, placing higher demands on the durability of their sealing structures. Traditional single-seal structures experience accelerated wear, shorter maintenance cycles, and continuously rising maintenance costs during long-term high-load operation, making them unsuitable for the high-efficiency and economical operation requirements of modern industry. Therefore, the development of a centrifugal pump with a dual-seal structure for improved efficiency is urgently needed. Utility Model Content

[0004] The main objective of this invention is to provide a centrifugal pump with a double-sealed structure that improves efficiency, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A centrifugal pump with a double-seal structure for improved efficiency includes a pump casing. A pump shaft is rotatably mounted inside the pump casing. A mechanical seal assembly is fitted onto the pump shaft. A reinforced seal assembly is installed in the gap between the pump shaft and the pump casing. The reinforced seal assembly consists of a rotating U-shaped rubber ring, a fixed U-shaped rubber ring, a sealing insert ring, a rubber ring, a supporting base ring, and an annular rubber airbag. The end faces of the rotating U-shaped rubber ring and the fixed U-shaped rubber ring are in contact with each other. The sealing insert ring is fixedly installed at one end of the fixed U-shaped rubber ring and is also inserted into the rotating U-shaped rubber ring. The rotating U-shaped rubber ring and the sealing insert ring are movably connected. There are two rubber rings, which are respectively fixedly installed on the inner walls of the rotating U-shaped rubber ring and the fixed U-shaped rubber ring. There are two annular rubber airbags, which are respectively fixedly installed at both ends of the supporting base ring. The supporting base ring is movably installed within the rotating U-shaped rubber ring and the fixed U-shaped rubber ring. The annular rubber airbag is embedded within the rubber ring.

[0007] Preferably, an impeller is fixedly mounted on the pump shaft, and the impeller is simultaneously rotatably mounted inside the pump casing.

[0008] Preferably, the mechanical seal assembly is inserted into the gap between the pump shaft and the pump housing from the outside in, and the mechanical seal assembly is located outside the reinforcing seal assembly.

[0009] Preferably, the rotating U-shaped rubber ring on the reinforced sealing assembly is fixedly sleeved on the pump shaft, and two first annular sealing grooves are symmetrically opened at one end of the rotating U-shaped rubber ring.

[0010] Preferably, the fixed U-shaped rubber ring on the reinforced sealing assembly is fixedly connected to the pump housing, and the sealing ring is inserted into the first annular sealing groove.

[0011] Preferably, one end of the rubber ring on the reinforced sealing assembly is provided with a second annular sealing groove, and the annular rubber airbag is movably embedded in the second annular sealing groove.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] By adding a reinforced sealing assembly consisting of a rotating U-shaped rubber ring, a fixed U-shaped rubber ring, a sealing insert ring, a rubber ring, a support base ring, and an annular rubber airbag to the gap between the pump shaft and the pump casing, the sealing performance of the centrifugal pump is significantly improved. When the centrifugal pump is conveying corrosive media, the rubber material in the reinforced sealing assembly itself has a certain degree of corrosion resistance. The rotating and fixed U-shaped rubber rings fit tightly together, and the sealing insert ring is inserted into the first annular sealing groove of the rotating U-shaped rubber ring, which can effectively prevent the leakage of corrosive media, avoid pollution to the surrounding environment and corrosion of other parts of the equipment, reduce the risk of safety accidents caused by media leakage, and ensure the safety of the production environment. When conveying volatile media, the annular rubber airbag is embedded in the second annular sealing groove of the rubber ring, which can further enhance the sealing effect, prevent the volatile media from escaping, reduce resource waste, and also avoid dangerous situations such as explosions that may be caused by the accumulation of volatile gases. Under high temperature and high pressure conditions, mechanical seal components may experience increased leakage risk due to changes in the performance of the sealing material. However, reinforced sealing components act as a second line of defense. The rotating and fixed U-shaped rubber rings, supported by the base ring, maintain a stable seal. The annular rubber bladder adaptively adjusts the sealing pressure under high temperature and pressure conditions, maintaining good sealing performance. This ensures stable operation of the centrifugal pump under harsh conditions, guaranteeing the continuity and stability of the production system and reducing increased production costs due to equipment failure. Furthermore, during long-term high-load operation of the centrifugal pump, the mechanical seal and reinforced sealing components share the wear. Compared to traditional single-seal structures, the presence of reinforced sealing components significantly improves the durability of the overall sealing structure, reduces accelerated wear, extends maintenance cycles, and lowers maintenance costs, better meeting the demands of efficient and economical operation in modern industry. Attached Figure Description

[0014] Figure 1 This is a partial cross-sectional structural diagram of the present invention;

[0015] Figure 2 For the present utility model Figure 1 A magnified view of point A;

[0016] Figure 3 This is a schematic diagram showing the positional relationship between the pump housing, pump shaft, mechanical seal assembly, and reinforced seal assembly of this utility model.

[0017] Figure 4 This is a cross-sectional view of the reinforced sealing assembly of this utility model;

[0018] Figure 5 For the present utility model Figure 4 Enlarged view of point B.

[0019] In the diagram: 1. Pump casing; 2. Pump shaft; 3. Impeller; 4. Mechanical seal assembly; 5. Reinforced seal assembly; 6. Rotating U-shaped rubber ring; 7. First annular sealing groove; 8. Fixed U-shaped rubber ring; 9. Sealing insert ring; 10. Rubber ring; 11. Second annular sealing groove; 12. Support base ring; 13. Annular rubber airbag. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0021] Please see Figure 1 - Figure 5As shown, a centrifugal pump with a double-seal structure for improved efficiency includes a pump casing 1, a pump shaft 2 rotatably mounted inside the pump casing 1, a mechanical seal assembly 4 fitted on the pump shaft 2, and a reinforced seal assembly 5 installed in the gap between the pump shaft 2 and the pump casing 1. The reinforced seal assembly 5 consists of a rotating U-shaped rubber ring 6, a fixed U-shaped rubber ring 8, a sealing insert ring 9, a rubber ring 10, a support base ring 12, and an annular rubber airbag 13. The end faces of the rotating U-shaped rubber ring 6 and the fixed U-shaped rubber ring 8 are in contact with each other. The sealing insert ring 9 is fixedly installed at one end of the fixed U-shaped rubber ring 8 and is also inserted into the rotating U-shaped rubber ring 6. The rotating U-shaped rubber ring 6 and the sealing insert ring 9 are movably connected. There are two rubber rings 10, which are respectively fixedly installed on the inner walls of the rotating U-shaped rubber ring 6 and the fixed U-shaped rubber ring 8. There are two annular rubber airbags 13, which are respectively fixedly installed at both ends of the support base ring 12. The support base ring 12 is movably installed... Within the rotating U-shaped rubber ring 6 and the fixed U-shaped rubber ring 8, the annular rubber airbag 13 is embedded within the rubber ring 10. This structure allows the components of the centrifugal pump to work together during operation. When conveying corrosive media, the rotating U-shaped rubber ring 6 and the fixed U-shaped rubber ring 8, made of rubber, can effectively prevent media leakage by virtue of their own corrosion resistance, combined with the cooperation of the sealing ring 9 and the first annular sealing groove 7, thus avoiding environmental pollution and corrosion of equipment components and reducing the risk of safety accidents. When conveying volatile media, the annular rubber airbag 13 is embedded in the second annular sealing groove 11 of the rubber ring 10, further enhancing the seal and reducing resource waste and explosion hazards. During the operation of the centrifugal pump, the pump shaft 2 drives the rotating U-shaped rubber ring 6 to rotate together. Since the sealing ring 9 is movably connected to the rotating U-shaped rubber ring 6 and the annular rubber airbag 13 is movably connected to the rubber ring 10, it can adapt to the rotation of the pump shaft 2 to a certain extent while ensuring the sealing effect.

[0022] Specifically, an impeller 3 is fixedly mounted on the pump shaft 2, and the impeller 3 is simultaneously rotated and installed inside the pump casing 1. The mechanical seal assembly 4 is inserted from the outside to the inside into the gap between the pump shaft 2 and the pump casing 1, and the mechanical seal assembly 4 is located outside the reinforcing seal assembly 5. This layout allows the mechanical seal assembly 4 and the reinforcing seal assembly 5 to form a double sealing structure. Under high temperature and high pressure conditions, if the mechanical seal assembly 4 experiences an increased risk of leakage due to changes in the performance of the sealing material, the reinforcing seal assembly 5 can serve as a second line of defense to maintain the overall sealing performance, ensure the stable operation of the centrifugal pump, guarantee the continuity and stability of the production system, and reduce production costs. During operation, when the centrifugal pump is connected to a power source, the power drives the pump shaft 2 to rotate, which in turn drives the impeller 3 to rotate inside the pump casing 1. The rotation of the impeller 3 creates a pressure difference inside the pump casing 1, thereby achieving the intake and discharge of fluid.

[0023] Furthermore, the rotating U-shaped rubber ring 6 on the reinforcing sealing assembly 5 is fixedly sleeved on the pump shaft 2. Two first annular sealing grooves 7 are symmetrically opened at one end of the rotating U-shaped rubber ring 6. The fixed U-shaped rubber ring 8 on the reinforcing sealing assembly 5 is fixedly connected to the pump casing 1. The sealing ring 9 is inserted into the first annular sealing groove 7. A second annular sealing groove 11 is opened at one end of the rubber ring 10 on the reinforcing sealing assembly 5. The annular rubber airbag 13 is movably embedded in the second annular sealing groove 11. During the long-term high-load operation of the centrifugal pump, the mechanical seal assembly 4 and the reinforcing sealing assembly 5 share the wear. Compared with the traditional single sealing structure, the presence of the reinforcing sealing assembly 5 greatly improves the durability of the overall sealing structure, reduces the situation of accelerated wear, extends the maintenance cycle, reduces maintenance costs, and is more suitable for the needs of efficient and economical operation in modern industry.

[0024] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A centrifugal pump with double-seal structure and efficiency improvement, comprising a pump shell (1), a pump shaft (2) rotatably installed in the pump shell (1), and a mechanical seal assembly (4) sleeved on the pump shaft (2), characterized in that: The gap between the pump shaft (2) and the pump shell (1) is provided with a reinforced sealing assembly (5), which is composed of a rotating U-shaped rubber ring (6), a fixed U-shaped rubber ring (8), a sealing insert ring (9), a rubber ring (10), a supporting base ring (12) and an annular rubber air bag (13), the end faces of the rotating U-shaped rubber ring (6) and the fixed U-shaped rubber ring (8) are in contact with each other, the sealing insert ring (9) is fixedly installed at one end of the fixed U-shaped rubber ring (8), and the sealing insert ring (9) is simultaneously inserted into the rotating U-shaped rubber ring (6), and the rotating U-shaped rubber ring (6) is movably connected with the sealing insert ring (9), the rubber ring (10) has two and is fixedly installed on the inner walls of the rotating U-shaped rubber ring (6) and the fixed U-shaped rubber ring (8) respectively, the annular rubber air bag (13) has two and is fixedly installed at both ends of the supporting base ring (12), the supporting base ring (12) is movably installed in the rotating U-shaped rubber ring (6) and the fixed U-shaped rubber ring (8), and the annular rubber air bag (13) is embedded in the rubber ring (10).

2. The centrifugal pump with double sealing structure and efficiency improvement according to claim 1, characterized in that: The pump shaft (2) is fixedly provided with an impeller (3), and the impeller (3) is rotatably installed in the pump shell (1).

3. The centrifugal pump with double sealing structure and efficiency improvement according to claim 2, characterized in that: The mechanical sealing assembly (4) is simultaneously inserted into the gap between the pump shaft (2) and the pump shell (1) from the outside to the inside, and the mechanical sealing assembly (4) is located on the outer side of the reinforced sealing assembly (5).

4. The centrifugal pump with double sealing structure and efficiency improvement according to claim 3, characterized in that: The rotating U-shaped rubber ring (6) of the reinforced sealing assembly (5) is fixedly sleeved on the pump shaft (2), and two first annular sealing grooves (7) are symmetrically formed in one end of the rotating U-shaped rubber ring (6).

5. The centrifugal pump with double sealing structure and efficiency improvement according to claim 4, characterized in that: The fixed U-shaped rubber ring (8) of the reinforced sealing assembly (5) is fixedly connected with the pump shell (1), and the sealing insert ring (9) is inserted into the first annular sealing groove (7).

6. The centrifugal pump with double sealing structure and efficiency improvement according to claim 5, characterized in that: One end of the rubber ring (10) of the reinforced sealing assembly (5) is provided with a second annular sealing groove (11), and the annular rubber air bag (13) is movably embedded in the second annular sealing groove (11).

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