Sealing structure of open pump for thermal power plant

Abstract

The utility model discloses a kind of open type pump sealing structure of thermal power plant, belong to the technical field of handover shaft protection, including open type pump shell, mechanical seal assembly and packing assembly, the middle part of open type pump shell is connected with pump shaft by inserting, the outside of pump shaft is equipped with mechanical seal assembly and packing assembly, mechanical seal assembly includes dynamic ring, static ring and elastic element.The beneficial effects of the utility model are: by increasing mechanical seal assembly on the basis of open type pump packing seal, and packing assembly is set to the outside of mechanical seal assembly, mechanical seal assembly can be protected using packing assembly, prevent solid particles from entering the inside of mechanical seal assembly to cause damage, and then the service life of the entire open type pump sealing structure is extended, simultaneously, by the mode of double sealing of mechanical seal assembly and packing assembly, improve the sealing reliability, effectively prevent the problem that open type pump leaks.

Description

Technical Field

[0001] This utility model relates to the field of shaft protection technology, and more specifically, to a sealing structure for an open pump in a thermal power plant. Background Technology

[0002] An open pump is a mechanical device that uses the rotation of an impeller to draw in liquid and force it into a pipeline. It does not have a closed casing. In thermal power plants, due to the low speed of open pumps, packing is often used for shaft end seals. In power plants located in coastal areas, the cooling water medium for open pumps is mostly seawater, which is highly corrosive and of poor quality. This results in short service life of the packing, severe wear, and large leakage. Seawater leaks can easily enter the bearing chamber, causing the grease in the bearing chamber to deteriorate. Seawater corrodes the bearings on both sides, causing damage to the bearings on both sides, which seriously affects the safe operation of the equipment and threatens the safety of inspection personnel.

[0003] Existing open pump sealing structures often employ packing seals, which generally offer only moderate sealing performance, and their durability and practicality require improvement. There is a lack of more stable and reliable open pump sealing structures. Furthermore, a utility model patent with publication number CN218818164U discloses a mechanical seal structure and pump. This mechanical seal structure includes a mounting unit comprising a base plate, a side plate, and a positioning boss. The edge of the base plate extends to form the side plate, and the positioning boss is located on the outer wall of the side plate. A stationary unit is fixed to the base plate for housing a rotating shaft. A moving unit is located inside the side plate, fixed to the rotating shaft, and rotates in contact with the stationary unit under the drive of the rotating shaft. This design is unsuitable for the seawater cooling medium environment of thermal power plants, and its durability and practicality require further improvement. Utility Model Content

[0004] To overcome the problems of existing open pump sealing structures often using packing seals, which have insufficient durability and practicality, and lack more stable and reliable open pump sealing structures, this utility model provides an open pump sealing structure for thermal power plants, including an open pump housing, a mechanical seal assembly, and a packing assembly. A pump shaft is inserted and connected to the middle of the open pump housing. The mechanical seal assembly and the packing assembly are sleeved on the outside of the pump shaft. The mechanical seal assembly includes a rotating ring, a stationary ring, and an elastic element. The rotating ring is rotatably mounted on the pump shaft, and the elastic element is sleeved on the outside of the rotating ring. The stationary ring is fixedly connected to the inner wall of the open pump housing and is arranged opposite to the rotating ring.

[0005] By adding a mechanical seal assembly to the packing seal of an open pump and placing the packing assembly outside the mechanical seal assembly, the packing assembly can protect the mechanical seal assembly, preventing solid particles from entering and damaging it. This effectively improves the service life of the machine and extends the service life of the entire open pump sealing structure. At the same time, the dual sealing method of the mechanical seal assembly and the packing assembly improves sealing reliability and effectively prevents leakage problems in the open pump.

[0006] Preferably, the surface of the moving ring is formed with a spiral groove, and the elastic element is placed in the spiral groove.

[0007] Preferably, the elastic element is a helical spring.

[0008] Preferably, the packing assembly includes at least one packing group, and each packing group includes multiple packings.

[0009] The mechanical seal assembly, consisting of a dynamic ring, a stationary ring, and an elastic element, can effectively seal a split-type pump by working together, avoiding environmental interference from seawater corrosion and enhancing the practicality of the sealing structure. At the same time, the packing assembly adopts multi-stage packing, increasing the number of sealing layers, further improving sealing performance, reducing leakage rate, and ensuring pump operating efficiency.

[0010] Preferably, the packing assembly is provided with an auxiliary sealing ring near the inlet of the open pump housing.

[0011] Preferably, an annular sealing groove is formed on the inner side of the moving ring, and an O-ring is provided in the sealing groove.

[0012] Preferably, both the moving ring and the stationary ring are provided with wear-resistant liners, and the inner wall of the wear-resistant liners is provided with a corrosion-resistant coating.

[0013] The packing assembly can be easily disassembled and replaced, has low maintenance costs, and will not damage other components. Its structural durability can be improved by the wear-resistant lining and corrosion-resistant coating set on the rotating and stationary rings.

[0014] Preferably, the rotating ring, stationary ring, and packing are coaxially mounted on the pump shaft.

[0015] Preferably, a gasket is provided on the outside of the stationary ring.

[0016] Preferably, packing assemblies are provided on both sides of the moving ring and the stationary ring between them and the open pump housing.

[0017] By installing a packing assembly on the outside of the mechanical seal assembly, the protection of the mechanical seal assembly can be enhanced.

[0018] Beneficial effects:

[0019] The beneficial effects of adopting the technical solution of this utility model are as follows:

[0020] (1) By adding a mechanical seal assembly to the packing seal of the open pump and placing the packing assembly outside the mechanical seal assembly, the packing assembly can protect the mechanical seal assembly and prevent solid particles from entering the mechanical seal assembly and causing damage. This can effectively improve the service life of the machine and extend the service life of the entire open pump sealing structure. At the same time, the double sealing method of the mechanical seal assembly and the packing assembly improves the sealing reliability and effectively prevents the open pump from leaking.

[0021] (2) The mechanical seal assembly, consisting of a dynamic ring, a static ring and an elastic element, can effectively seal the open pump by working together, and avoid environmental interference from seawater corrosion, thus enhancing the practicality of the sealing structure. At the same time, the packing assembly adopts multi-stage packing, which increases the number of sealing layers, further improves the sealing performance, and reduces the leakage rate, thus ensuring the working efficiency of the pump.

[0022] (3) The packing assembly can be easily disassembled and replaced, with low maintenance costs and no damage to other parts. The durability of its structure can be improved by the wear-resistant lining and corrosion-resistant coating set on the dynamic ring and stationary ring. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of the sealing structure of the open pump in a thermal power plant according to this utility model.

[0025] Figure 2 This is a schematic diagram of the dynamic ring connection structure of the sealing structure of the open pump in a thermal power plant according to this utility model.

[0026] In the diagram: 1. Open pump housing; 2. Pump shaft; 3. Rotating ring; 4. Elastic element; 5. Stationary ring; 6. O-ring; 7. Gasket; 8. Packing assembly; 9. Auxiliary sealing ring; 10. Wear-resistant liner; 11. Corrosion-resistant coating. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to represent selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0028] This embodiment adds a mechanical seal assembly to the open pump packing seal, and positions the packing assembly outside the mechanical seal assembly. The packing assembly protects the mechanical seal assembly, preventing solid particles from entering and damaging it, thus effectively extending the service life of the mechanical seal and consequently the entire open pump sealing structure. Furthermore, the dual sealing method of the mechanical seal assembly and packing assembly improves sealing reliability and effectively prevents leakage in the open pump. The specific implementation method is as follows:

[0029] like Figures 1 to 2 As shown, an open-type pump sealing structure for a thermal power plant includes an open-type pump housing 1, a mechanical seal assembly, and a packing assembly 8. A pump shaft 2 is inserted through the middle of the open-type pump housing 1. The mechanical seal assembly and the packing assembly 8 are sleeved on the outside of the pump shaft 2. The mechanical seal assembly includes a rotating ring 3, a stationary ring 5, and an elastic element 4. The rotating ring 3 is rotatably mounted on the pump shaft 2, and the elastic element 4 is sleeved on the outside of the rotating ring 3. The stationary ring 5 is fixedly connected to the inner wall of the open-type pump housing 1 and is arranged opposite to the rotating ring 3. By adding a mechanical seal assembly to the open-type pump packing seal and placing the packing assembly 8 on the outside of the mechanical seal assembly, the packing assembly 8 can protect the mechanical seal assembly, preventing solid particles from entering the mechanical seal assembly and causing damage. This effectively improves the service life of the mechanical seal, thereby extending the service life of the entire open-type pump sealing structure. At the same time, the double sealing method of the mechanical seal assembly and the packing assembly 8 improves the sealing reliability and effectively prevents leakage problems in the open-type pump.

[0030] The mechanical seal assembly, consisting of a dynamic ring 3, a stationary ring 5, and an elastic element 4, can effectively seal a split pump by working together, and avoid environmental interference from seawater corrosion, thus enhancing the practicality of the sealing structure.

[0031] The rotating ring 3 is mounted on the pump shaft 2 and rotates with it. The main function of the rotating ring 3 is to fit tightly with the stationary ring 5 to form an effective sealing surface, thereby preventing the medium from leaking from the gap between the shaft and the housing. The stationary ring 5 can keep in contact with the rotating ring 3 and slide relative to each other under the action of fluid pressure and elastic elements to prevent fluid leakage.

[0032] The surface of the rotating ring 3 has a spiral groove, and an elastic element 4 is placed inside the spiral groove. The main functions of the elastic element 4 include pre-tightening, compensation, and buffering, and it plays an important role in the mechanical seal.

[0033] Elastic element 4 is a helical spring. The helical spring keeps the rotating ring firmly pressed against the stationary ring, ensuring a tight seal and preventing fluid leakage. During mechanical seal operation, slight displacement or deformation may occur between the sealing surfaces due to temperature changes, pressure fluctuations, etc. The spring's elasticity compensates for these changes, maintaining the sealing surface's fit and ensuring a good seal. Furthermore, the spring acts as a buffer, reducing the impact and vibration experienced by the rotating ring during high-speed rotation, protecting the sealing surface from damage.

[0034] The packing assembly 8 includes at least one packing group, and each packing group includes multiple packings. The packing assembly 8 uses multi-stage packing, which increases the number of sealing layers, further improves sealing performance, reduces leakage rate, and ensures pump operating efficiency.

[0035] An auxiliary sealing ring 9 is provided on the packing assembly 8 near the inlet of the open pump housing 1. The auxiliary sealing ring 9 provides auxiliary sealing for the packing assembly 8.

[0036] An annular sealing groove is formed on the inner side of the rotating ring 3, and an O-ring 6 is installed within the sealing groove. The O-ring 6, or O-ring (sealing ring), can be installed in an auxiliary position on the rotating ring 3 or the stationary ring 5. It uses elastic deformation to fill the gap, preventing media leakage along the axial or radial direction, and compensating for gap changes caused by wear or vibration. The O-ring 6 serves as an auxiliary seal and slip compensation, ensuring a stable sealing effect at the sealing end face.

[0037] Both the rotating ring 3 and the stationary ring 5 are provided with wear-resistant liners 10, and the inner wall of the wear-resistant liners 10 is provided with a corrosion-resistant coating 11. By providing the wear-resistant liners 10 and the corrosion-resistant coating 11 on the rotating ring 3 and the stationary ring 5, the durability and service life of their structure can be improved, and wear can be reduced.

[0038] The rotating ring 3, the stationary ring 5, and the packing are coaxially mounted on the pump shaft 2.

[0039] A gasket 7 is installed on the outside of the stationary ring 5. The main function of the gasket 7 is to seal and prevent fluid medium from leaking from the inside of the pump. The gasket 7 can also reduce friction inside the pump and protect the equipment from damage.

[0040] Packing assemblies 8 are installed on both sides of the rotating ring 3 and the stationary ring 5 between them and the open pump housing 1. By installing packing assemblies 8 on the outside of the mechanical seal assembly, the protection of the mechanical seal assembly can be strengthened. The packing assemblies 8 can be easily disassembled and replaced, resulting in low maintenance costs and no damage to other components.

[0041] Working Principle: By adding a mechanical seal assembly to the packing seal of an open pump, and placing the packing assembly outside the mechanical seal assembly, the packing assembly protects the mechanical seal assembly, preventing solid particles from entering and damaging it. This effectively extends the service life of the mechanical seal and, consequently, the entire open pump sealing structure. The dual sealing method of the mechanical seal assembly and packing assembly improves sealing reliability and effectively prevents leakage in the open pump. The mechanical seal assembly, composed of a rotating ring, a stationary ring, and an elastic element, works together to effectively seal the open pump and avoid environmental interference from seawater corrosion, enhancing the practicality of the sealing structure. Furthermore, the multi-stage packing assembly increases the number of sealing layers, further improving sealing performance and reducing leakage rates, ensuring pump efficiency. The packing assembly can be easily disassembled and replaced, resulting in low maintenance costs and no damage to other components. Wear-resistant liners and corrosion-resistant coatings on the rotating and stationary rings enhance the structural durability.

[0042] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A sealing structure for an open pump in a thermal power plant, characterized in that, The pump includes an open pump housing (1), a mechanical seal assembly, and a packing assembly (8). A pump shaft (2) is inserted through the middle of the open pump housing (1). The mechanical seal assembly and the packing assembly (8) are sleeved on the outside of the pump shaft (2). The mechanical seal assembly includes a rotating ring (3), a stationary ring (5), and an elastic element (4). The rotating ring (3) is rotatably mounted on the pump shaft (2), and the elastic element (4) is sleeved on the outside of the rotating ring (3). The stationary ring (5) is fixedly connected to the inner wall of the open pump housing (1) and is arranged opposite to the rotating ring (3).

2. The sealing structure for an open pump in a thermal power plant according to claim 1, characterized in that, The surface of the moving ring (3) is formed with a spiral groove, and the elastic element (4) is placed in the spiral groove.

3. The sealing structure for an open pump in a thermal power plant according to claim 1, characterized in that, The elastic element (4) is a helical spring.

4. The sealing structure for an open pump in a thermal power plant according to claim 1, characterized in that, The packing assembly (8) includes at least one packing group, and each packing group includes multiple packings.

5. The sealing structure for an open pump in a thermal power plant according to claim 1, characterized in that, An auxiliary sealing ring (9) is provided near the inlet of the open pump housing (1) of the packing assembly (8).

6. The sealing structure for an open pump in a thermal power plant according to claim 1, characterized in that, An annular sealing groove is formed on the inner side of the moving ring (3), and an O-ring (6) is provided in the sealing groove.

7. The sealing structure for an open pump in a thermal power plant according to claim 1, characterized in that, The interior of both the moving ring (3) and the stationary ring (5) is provided with a wear-resistant liner (10), and the inner wall of the wear-resistant liner (10) is provided with a corrosion-resistant coating (11).

8. The sealing structure for an open pump in a thermal power plant according to claim 1, characterized in that, The moving ring (3), the stationary ring (5), and the packing are coaxially mounted on the pump shaft (2).

9. The sealing structure for an open pump in a thermal power plant according to claim 1, characterized in that, A gasket (7) is provided on the outside of the stationary ring (5).

10. The sealing structure for an open pump in a thermal power plant according to claim 1, characterized in that, Packing assemblies (8) are provided on both sides of the moving ring (3) and the stationary ring (5) between the open pump housing (1).

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