Simple dismounting and mounting type centrifugal pump shaft seal structure

Abstract

The utility model relates to centrifugal pump shaft sealing structure technical field, especially disclose a simple dismounting and installation type centrifugal pump shaft sealing structure, aims at solving the problem of traditional centrifugal pump shaft sealing dismounting and installation time -consuming and labor -intensive, spare part cost increase and existing security hidden danger. Including sealing box, sealing box flange hole, seal, pump shaft, sealing installation tool and sealing dismounting tool, the seal is set up in the sealing box, and the pump shaft is provided with the seal and realizes the sealing effect, and the sealing dismounting tool is used to take out the seal from the sealing box, and the sealing installation tool is used to press package the seal into the sealing box, first take out and wash the sealing box when operating, take out old seal with dismounting tool, after coating lubricating oil on the inner wall of sealing box, press package new seal with installation tool in proper order. The utility model is safe and reliable, can alleviate the labor intensity, reduce the spares loss and environmental pollution, improve the maintenance efficiency, can also be extended to be used for the sealing installation of various shafts on the vehicle, has the characteristics such as simple and reasonable structure, good use effect.

Description

Technical Field

[0001] This utility model relates to the technical field of centrifugal pump shaft sealing structure, and in particular to a centrifugal pump shaft sealing structure that is easy to disassemble and install. Background Technology

[0002] A centrifugal pump is a common mechanical device whose core function is impeller rotation. It converts electrical energy into rotational mechanical energy, which is transmitted through the pump shaft to drive the impeller, transporting liquids or acid-base mixtures from the pump casing to tanks or storage pools. The seal is a key component that prevents leakage of liquids or mixtures from the pump casing, maintains a clean environment around the pump, and prevents external moisture, dust, and other impurities from entering the pump body, ensuring stable operation and achieving the intended function of the centrifugal pump.

[0003] While the seal is a standard component, it is composed of multiple corresponding parts, and there is relative movement between the internal components of the seal when the pump shaft is running, resulting in a high degree of structural complexity, essentially making it a "small device." However, the traditional method of disassembling and installing centrifugal pump shaft seals has significant drawbacks: using a small copper rod to press against the seal and then alternately striking the rod with a hammer for disassembly and assembly leads to uneven stress on the seal. This not only makes it difficult to remove or properly install the seal, but even if it is installed, most seals will suffer varying degrees of damage.

[0004] Damaged seals can easily lead to pump shaft seal leakage. If not dealt with in time, it will cause leakage of liquid inside the pump (especially acid-base mixtures), polluting the surrounding environment. On the other hand, it may cause personal injury to operators. At the same time, frequent damage to the seal will increase the cost of spare parts, and the disassembly and assembly process is time-consuming and laborious, which will seriously reduce maintenance efficiency and fail to meet the needs of efficient maintenance of centrifugal pumps. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a simple disassembly and installation type centrifugal pump shaft seal structure, which solves the technical problems of uneven seal force, easy damage and leakage caused by the traditional centrifugal pump shaft seal disassembly and installation method of tapping with a small copper rod, as well as the time-consuming and labor-intensive disassembly and installation, increased spare parts costs, and safety hazards.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A centrifugal pump shaft seal structure with easy disassembly and installation includes a seal box, a seal, a pump shaft, a seal installation tool, and a seal disassembly tool; The sealing box has a sealing box flange hole, the seal is set inside the sealing box, and the pump shaft passes through the seal and cooperates with the seal to achieve sealing. The seal removal tool is used to remove the seal from the seal box, and the seal installation tool is used to press the seal into the seal box.

[0007] Preferably, the part of the seal removal tool that contacts the seal has a joint between the removal tool and the seal, and the inner side of the joint between the removal tool and the seal is adapted to the outer side of the seal so that the seal is subjected to uniform force when the seal removal tool is struck.

[0008] Preferably, the part of the sealing installation tool that contacts the seal has a joint between the installation tool and the seal, and the end face of the joint between the installation tool and the seal is parallel and fits against the end face of the seal, so that the seal can be smoothly pressed into the innermost part of the sealing box when the sealing installation tool is tapped.

[0009] Preferably, the inner wall of the sealing box can be coated with lubricating oil to reduce friction between the seal and the inner wall of the sealing box, and to assist in the installation of the seal.

[0010] Preferably, the seal removal tool is made of an elastic material, including but not limited to rubber, to prevent the seal removal tool from damaging the seal during the removal process.

[0011] Preferably, the sealing installation tool has a columnar structure, and the joint between the installation tool and the seal is one end face of the columnar structure. The area of ​​this end face is not less than the area of ​​the sealing end face, so as to ensure that the sealing end face is subjected to uniform force during installation.

[0012] Preferably, at least one seal can be provided in the sealing box, and the sealing installation tool can be adapted to the installation requirements of different numbers of seals. Multiple sets of seals can be pressed into place by repeatedly tapping the sealing installation tool. In addition to being used for the disassembly and installation of centrifugal pump shaft seals, this sealing structure can also be applied to the disassembly and installation of seals on various shafts in vehicles, and is adapted to the seals and sealing box sizes of vehicle shaft structures.

[0013] Compared with the prior art, the present invention has the following beneficial effects: High safety and reliability: This utility model achieves seal disassembly and assembly through dedicated seal disassembly and assembly tools, avoiding the problem of uneven seal force caused by traditional copper rod hammering, reducing the probability of seal damage, and thus reducing the risk of liquid pollution to the environment and injury to operators caused by seal leakage, ensuring the safety of disassembly and assembly process and centrifugal pump operation.

[0014] Reduced labor intensity and spare parts wear: The use of specialized tools eliminates the need for repeated adjustments to the tapping position, simplifying the disassembly and assembly process and significantly reducing the labor intensity of maintenance personnel; at the same time, the seals are less likely to be damaged during disassembly and assembly, effectively reducing the scrap rate of seal spare parts and lowering the cost of spare parts procurement and replacement.

[0015] Improved maintenance efficiency: Compared with traditional methods, this utility model adopts a standardized process of disassembling tools to remove the seal, cleaning the seal box, applying lubricating oil, and installing tools to install the seal. Combined with the uniform force of the tools on the seal, it greatly shortens the seal disassembly and assembly time, improves the maintenance efficiency of centrifugal pumps, and reduces equipment downtime.

[0016] Reduced environmental pollution: Leakage problems caused by damage during seal disassembly and assembly are effectively solved, and the liquid inside the pump casing is less likely to leak to the outside, avoiding pollution to the surrounding environment and meeting environmental protection requirements.

[0017] Simple structure and strong versatility: The sealing structure and disassembly tools of this utility model are simple and reasonable in design, with low manufacturing cost and convenient use; and it is not only suitable for the disassembly and assembly of centrifugal pump shaft seals, but can also be adapted to the corresponding specifications of seals, sealing boxes and tools according to the size of vehicle shaft structures, and can be extended to the sealing installation of various shafts on vehicles, with a wide range of applications and strong practicality.

[0018] Excellent performance: During installation, lubricating oil is applied to reduce friction, and with the smooth pressing of the installation tools, the seal can be accurately installed to the innermost part of the sealing box, ensuring the sealing performance between the seal, pump shaft, and sealing box, effectively extending the service life of the seal and the stable operation cycle of the centrifugal pump. Attached Figure Description

[0019] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the structure of this embodiment.

[0021] Figure 2 A schematic diagram of the structure for disassembling the centrifugal pump shaft seal.

[0022] Figure 3 A schematic diagram of the structure for installing a centrifugal pump shaft seal.

[0023] Legend: 1. Sealing box; 2. Flange hole of sealing box; 3. Seal; 4. Pump shaft; 5. Seal installation tool; 6. Seal removal tool; 7. Joint between removal tool and seal; 8. Joint between installation tool and seal. Detailed Implementation

[0024] This application provides a simple disassembly and installation centrifugal pump shaft seal structure, which effectively solves the technical problems of uneven seal force, easy damage and leakage caused by the traditional centrifugal pump shaft seal when it is disassembled and installed by tapping with a small copper rod, as well as the time-consuming and labor-intensive disassembly and installation, increased spare parts costs, and safety hazards. Example

[0025] like Figure 1 , Figure 2 , Figure 3 As shown, the overall technical solution in this application embodiment is as follows: To address the problems existing in the prior art, this utility model provides a simple disassembly and installation type centrifugal pump shaft seal structure. It aims to solve the problems of uneven force distribution, easy damage to the seal, low efficiency, and safety hazards during the disassembly and installation of traditional centrifugal pump shaft seals. Its core functionality lies in achieving safe and efficient disassembly and installation of the seal through matching seal disassembly and installation tools combined with a reasonable operating procedure. The specific implementation process is described in detail below with reference to the accompanying drawings: Preliminary preparations and structural confirmation: First, the core components of this utility model are defined, including a sealing box 1, a sealing box flange hole 2, a sealing element 3, a pump shaft 4, a sealing installation tool 5, a sealing disassembly tool 6, a disassembly tool and sealing connection 7, and an installation tool and sealing connection 8. The sealing box 1 serves as the mounting carrier for the sealing element 3. The sealing box flange hole 2 is used for the fixed connection between the sealing box 1 and the centrifugal pump body. The sealing element 3 is located inside the sealing box 1 and cooperates with the pump shaft 4 passing through it, achieving a seal for the liquid or acid-base mixture inside the pump casing, preventing leakage or the entry of external debris. The sealing disassembly tool 6 is made of elastic materials such as rubber. The inner surface of its disassembly tool and sealing connection 7 is adapted to the outer surface of the sealing element 3, ensuring a tight fit with the sealing element 3 during disassembly and assembly. The sealing installation tool 5 has a columnar structure, with its end face parallel to the end face of the sealing element 3, and the end face area is not less than the end face area of ​​the sealing element 3, ensuring uniform force on the sealing element 3 during installation.

[0026] Before operation, the centrifugal pump must be stopped and confirmed to be in a power-off and pressure-free state. Then, the fasteners connecting the sealing box 1 to the centrifugal pump body are removed (through the flange hole 2 of the sealing box). The sealing box 1 is removed from the centrifugal pump. The residual liquid and impurities on the surface of the sealing box 1 are cleaned. The inner wall of the sealing box 1 is preliminarily checked for wear and deformation. If there is any abnormality, the sealing box 1 must be repaired or replaced first.

[0027] Seal disassembly process: After removing the sealing box 1, place it flat on a stable operating platform to ensure that the sealing component 3 is in an operable state; take out the sealing removal tool 6, and adjust the position of the sealing removal tool 6 according to the size of the sealing component 3 so that the removal tool and the sealing joint 7 are completely in contact with the outer side of the sealing component 3, ensuring that there is no gap between the two and avoiding slippage or local stress of the sealing removal tool 6 during disassembly.

[0028] Hold a hammer (choose a moderately heavy fitter's hammer to avoid excessive impact) and vertically align it with the top of the seal removal tool 6 (the end away from the joint between the removal tool and the seal 7). Slowly and evenly tap the seal removal tool 6. During the tapping process, keep the hammer vertical to avoid uneven force on the seal 3. The impact force is transmitted through the elasticity of the seal removal tool 6, so that the seal 3 is slowly loosened along the inner wall of the seal box 1.

[0029] Continue tapping evenly until the seal 3 is completely removed from the sealing box 1. If the seal 3 is tightly attached to the inner wall of the sealing box 1, the tapping force can be increased appropriately, but sudden force should be avoided to prevent damage to the seal 3 or the sealing box 1. After the seal 3 is removed, separate it from the seal removal tool 6, and then thoroughly clean the inner wall of the sealing box 1 to remove residual seal debris, oil stains, etc. You can use a high-pressure air gun to dry the inner wall of the sealing box 1 to ensure that there are no impurities left.

[0030] Sealing installation process: Before installation, check whether the dimensions of the new seal 3 match those of the sealing box 1 and the pump shaft 4, and confirm that the seal 3 is free from defects such as deformation or damage. Then, apply a layer of lubricating oil evenly to the inner wall of the sealing box 1 (select lubricating oil compatible with the pump's conveying medium, such as mineral oil). The thickness of the lubricating oil should be enough to cover the inner wall of the sealing box 1. The purpose is to reduce the frictional resistance between the seal 3 and the inner wall of the sealing box 1, making it easier to press the seal 3 into place.

[0031] First, slowly press the first new seal 3 into the sealing box 1 by hand until the seal 3 can no longer be pushed in by hand alone; at this time, take out the sealing installation tool 5 and make the end face of the installation tool and the sealing joint 8 completely fit the end face of the seal 3 to ensure that the two are parallel and without offset, so as to avoid the seal 3 tilting during installation.

[0032] Hold the hammer vertically and aim it at the top of the sealing installation tool 5 (the end away from the joint between the installation tool and the seal 8), and tap the sealing installation tool 5 evenly to push the seal 3 inward along the inner wall of the sealing box 1. During the tapping process, observe the position of the seal 3 in real time to ensure that it moves along the axis of the sealing box 1 until the seal 3 reaches the innermost end of the sealing box 1 (the installation can be confirmed by the depth of the sealing box 1 or the positioning step).

[0033] If the centrifugal pump requires the installation of multiple seals 3 (the specific number is determined according to the design requirements of the centrifugal pump, such as 2-3), then repeat steps 2-3: first, press the next new seal 3 into the seal box 1 by hand, then use the seal installation tool 5 to fit and tap it, and complete the installation of all seals 3 in sequence, ensuring that the adjacent seals 3 fit tightly without gaps.

[0034] Subsequent assembly and inspection: After all seals 3 are installed, reinstall the sealing box 1 back into the centrifugal pump body. Insert fasteners through the flange hole 2 of the sealing box and tighten them to ensure a good seal between the sealing box 1 and the centrifugal pump body. Then start the centrifugal pump for trial operation, observe the fit between the seals 3 and the pump shaft 4, and check for problems such as liquid leakage and abnormal noise. If everything is normal, the entire seal disassembly and assembly operation is complete. If leakage occurs, stop the machine and check whether the installation position of the seals 3 is in place and whether the inner wall of the sealing box 1 is clean. If necessary, disassemble and reinstall.

[0035] The sealing structure and disassembly method of this utility model are not only applicable to centrifugal pump shaft seals, but also to the disassembly and assembly of seals on various shafts in vehicles. When applying it, simply adjust the specifications of the sealing box 1 and the sealing element 3 according to the size of the vehicle shaft structure (such as the inner diameter of the sealing element 3 to match the vehicle shaft diameter, and the outer shape of the sealing box 1 to match the vehicle installation space). At the same time, adjust the size of the sealing disassembly tool 6 and the sealing installation tool 5 accordingly (ensure that the disassembly tool and the seal joint 7 are adapted to the outer side of the vehicle seal, and the installation tool and the seal joint 8 are adapted to the end face of the vehicle seal). Then, follow the same disassembly and installation process as described above to achieve safe and efficient disassembly and assembly of vehicle shaft seals.

[0036] Sealing box 1 and sealing box flange holes 2: Sealing box 1 is a hollow structure with a smooth, burr-free inner wall, used to accommodate the sealing element 3 and provide installation positioning; sealing box flange holes 2 are evenly distributed on the edge of sealing box 1, and the number is determined according to the size of sealing box 1 (usually 3-4), used to fix sealing box 1 to centrifugal pump or vehicle axle structure with fasteners, ensuring that sealing box 1 is installed firmly and avoiding displacement during operation that could lead to leakage.

[0037] Seal 3 and pump shaft 4: Seal 3 is the core sealing component, usually made of elastic sealing material (such as nitrile rubber or fluororubber). Its inner diameter is interference-fitted with the outer diameter of the pump shaft 4, and its outer diameter is clearance-fitted with the inner diameter of the sealing box 1 to achieve dynamic sealing when the pump shaft 4 rotates. The pump shaft 4 is the power transmission component. When the seal 3 is installed, the shaft surface must be smooth to avoid scratching the inner wall of the seal 3 and affecting the sealing effect.

[0038] The seal removal tool 6 and the joint between the removal tool and the seal 7: The seal removal tool 6 is shaped like a "cap" or "sleeve" and is made of elastic materials such as rubber, which has both strength and flexibility to avoid hard damage to the seal 3 during disassembly; The joint between the removal tool and the seal 7 is the contact part between the tool and the seal 3. Its inner curvature and size are perfectly matched with the outer shape of the seal 3 (if the seal 3 is circular, then the joint 7 is an inner arc), ensuring that the impact force is evenly transmitted to the entire seal 3 when it is struck, and avoiding local deformation due to force.

[0039] Sealing installation tool 5 and the joint between the installation tool and the seal 8: The sealing installation tool 5 is a solid columnar structure, and the material can be metal (such as aluminum alloy, which combines strength and lightweight) or high-strength engineering plastic; the joint between the installation tool and the seal 8 is one end face of the columnar tool, which needs to be precisely machined to ensure flatness, and the end face area is not less than the end face area of ​​the seal 3, to ensure that the end face of the seal 3 is fully stressed during installation and is smoothly pushed along the inner wall of the sealing box 1, avoiding tilting or displacement.

[0040] This invention avoids hard contact damage during seal assembly and disassembly using specialized tools, reducing the probability of seal leakage and thus lowering the environmental pollution and personnel safety risks caused by leakage of liquid (especially corrosive liquid) inside the pump. At the same time, it eliminates the need to repeatedly adjust the tool position during operation, reducing the labor intensity of operators.

[0041] The standardized disassembly and assembly process (cleaning-disassembly-oiling-installation) combined with the even force transmission of special tools reduces the seal disassembly and assembly time by more than 50% compared with the traditional method. It is especially suitable for batch centrifugal pump maintenance or emergency repair scenarios, reducing equipment downtime.

[0042] Specialized tools prevent seals from being scrapped due to damage during disassembly and assembly, reducing spare parts consumption; at the same time, there is no need to purchase additional complex equipment, the tools have a simple structure, low manufacturing cost, and long service life (rubber disassembly tools can be reused more than 50 times, and metal installation tools can be used for a long time).

[0043] By adjusting the size of the components, it can be adapted to centrifugal pump shaft seals and vehicle shaft seals of different specifications, eliminating the need to design tools separately for different equipment, thereby increasing the reusability of tools and reducing maintenance costs.

[0044] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention 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. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A centrifugal pump shaft seal structure with easy disassembly and installation, characterized in that, Includes a sealing box (1), a sealing element (3), a pump shaft (4), a sealing installation tool (5), and a sealing removal tool (6); The sealing box (1) has a sealing box flange hole (2), the sealing element (3) is set inside the sealing box (1), and the pump shaft (4) passes through the sealing element (3) and cooperates with the sealing element (3) to achieve sealing.

2. The easily disassembled and installed centrifugal pump shaft seal structure according to claim 1, characterized in that: The part where the sealing disassembly tool (6) contacts the sealing element (3) is provided with a disassembly tool and sealing joint (7), and the inner side of the disassembly tool and sealing joint (7) is adapted to the shape of the outer side of the sealing element (3).

3. The easily disassembled and installed centrifugal pump shaft seal structure according to claim 1, characterized in that: The part of the sealing installation tool (5) that contacts the sealing element (3) is provided with a joint (8) between the installation tool and the seal. The end face of the joint (8) between the installation tool and the seal is parallel to and fits the end face of the sealing element (3).

4. The easily disassembled and installed centrifugal pump shaft seal structure according to claim 1, characterized in that: The inner wall of the sealed box (1) may be coated with lubricating oil.

5. A centrifugal pump shaft seal structure for easy disassembly and installation according to claim 1 or 3, characterized in that: The sealing installation tool (5) has a columnar structure, and the joint between the installation tool and the seal (8) is one end face of the columnar structure. The area of ​​this end face is not less than the area of ​​the end face of the seal (3).

6. The easily disassembled and installed centrifugal pump shaft seal structure according to claim 1, characterized in that: At least one sealing element (3) may be provided inside the sealing box (1).

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