Double casing slurry pump shaft seal mounting structure

Abstract

The application relates to a double-shell slurry pump shaft seal mounting structure and belongs to the technical field of slurry pumps. The double-shell slurry pump shaft seal mounting structure comprises an outer shell, an impeller, a rotating shaft and an inner shell, the outer shell and the inner shell are fixed to form a pump cavity, one end of the rotating shaft is connected with an external motor through a shaft coupling, the other end of the rotating shaft penetrates into the pump cavity and is fixed with the impeller, the rotating shaft and the impeller are both arranged to rotate relative to the pump cavity, a shaft sleeve is fixed on the rotating shaft in a sleeving mode, the shaft sleeve penetrates into the pump cavity, a shaft seal assembly for sealing the gap between the outer shell and the shaft sleeve is sleeved on the shaft sleeve, the shaft seal assembly is fixedly connected with a rear backing plate, the rear backing plate is slidably connected with the outer shell, and the sliding direction is arranged along the length direction of the rotating shaft, and the outer shell and the rear backing plate are provided with a limiting piece for adjusting and locking the position of the rear backing plate, and the application has the effect of improving the convenience of adjusting the position of the rear backing plate.

Description

Technical Field

[0001] This application relates to the technical field of slurry pumps, and in particular to a shaft seal installation structure for a double-casing slurry pump. Background Technology

[0002] Slurry pumps are specialized pumps for conveying solid particles, such as slurry and mineral slurry. Slurry pumps are a type of centrifugal pump; their core principle is to convert electrical energy into the kinetic and pressure energy of the slurry by generating centrifugal force through the high-speed rotation of the impeller. They are adaptable to complex working conditions and widely used in industries such as mining and metallurgy.

[0003] A typical double-casing slurry pump includes a rear liner, an inner casing, an outer casing, and a shaft seal assembly. The rear liner and the inner casing, as well as the inner casing and the outer casing, are fixed to each other. The shaft seal assembly is independently installed on the shaft sleeve to ensure sealing.

[0004] After a period of use, the clearance between the rear liner and the impeller increases, leading to increased wear and reduced pump efficiency. At this time, the position of the rear liner needs to be adjusted. For ordinary double-casing slurry pumps, the shaft seal assembly is independently installed on the shaft sleeve, and there is no linkage between the shaft seal assembly and the rear liner. Adjusting the rear liner requires disassembling the outer shell and the inner shell, which is inconvenient for adjusting the position of the rear liner. Utility Model Content

[0005] To improve the ease of adjusting the rear liner position, this application provides a shaft seal installation structure for a double-casing slurry pump.

[0006] The technical solution for the shaft seal installation structure of a double-casing slurry pump provided in this application is as follows: A shaft seal installation structure for a double-casing slurry pump includes an outer casing, an impeller, a rotating shaft, and an inner casing. The outer casing and the inner casing are fixedly arranged to form a pump chamber. One end of the rotating shaft is connected to an external motor via a coupling, and the other end passes through the pump chamber and is fixed to the impeller. Both the rotating shaft and the impeller are rotatably arranged relative to the pump chamber. A shaft sleeve is fixedly annularly on the rotating shaft and passes through the pump chamber. A shaft seal assembly for sealing the gap between the outer casing and the shaft sleeve is annularly annularly fitted on the shaft sleeve. The shaft seal assembly is fixedly connected to a rear liner. The rear liner is slidably connected to the outer casing, and the sliding direction is set along the length direction of the rotating shaft. A limiting member for adjusting and locking the position of the rear liner is provided between the outer casing and the rear liner.

[0007] By adopting the above technical solution, the shaft seal assembly and the rear liner are linked and assembled. The rear liner can slide relative to the outer shell along the length of the rotating shaft. With the help of the limiting component, the position of the rear liner can be adjusted without disassembling the outer shell and the inner shell, and the gap between the rear liner and the impeller can be quickly corrected. This solves the problem of the cumbersome pump disassembly required for adjustment in traditional structures, and significantly improves the convenience of adjustment. At the same time, the shaft seal assembly always maintains the seal between the shaft sleeve and the outer shell, ensuring the sealing and stability of the pump body operation.

[0008] Optionally, the shaft seal assembly is a packing seal for a slurry pump.

[0009] By adopting the above technical solution, the packing seal is simple in structure, low in cost and suitable for media containing solid particles, so as to achieve a reliable seal between the outer shell and the shaft sleeve, effectively blocking slurry leakage. At the same time, the maintenance cost of the packing seal is low and the packing can be easily replaced in the future, which can meet the complex operating conditions of the slurry pump.

[0010] Optionally, an assembly fixture for defining the uniformity of the gap between the bushing and the bushing is inserted between the outer wall of the bushing and the shaft seal assembly.

[0011] By adopting the above technical solution, the relative position of the shaft seal assembly and the shaft sleeve can be quickly positioned with the help of assembly tooling during the assembly process, ensuring that the sealing gap between the two is uniform and consistent, avoiding local wear or sealing failure caused by gap deviation, improving the installation accuracy and sealing reliability of the shaft seal assembly. At the same time, the tooling only serves a positioning function, and can be easily removed after tightening the fastening screws without affecting the normal operation of the pump body.

[0012] Optionally, the assembly fixture is semi-circular.

[0013] By adopting the above technical solution, the semi-ring structure assembly fixture can be quickly inserted and removed from the side of the bushing and shaft seal assembly without disassembling other parts, further simplifying the assembly process. At the same time, the semi-ring design can be adapted to the ring structure of the bushing, ensuring the fit with the bushing and shaft seal assembly during positioning and ensuring a uniform positioning effect.

[0014] Optionally, a fastening screw is provided between the shaft seal assembly and the rear liner, and the fastening screw passes through the shaft seal assembly and is threadedly connected to the rear liner.

[0015] By adopting the above technical solution, a firm connection between the shaft seal assembly and the rear liner is achieved with the help of fastening screws, ensuring that there is no relative loosening when the two are moved synchronously, thus guaranteeing the accuracy of gap adjustment. At the same time, the threaded connection method makes disassembly and assembly convenient. When the shaft seal assembly is replaced in the future, only the fastening screws need to be removed to separate the two without disassembling the pump, thereby improving maintenance efficiency.

[0016] Optionally, the limiting component is an adjusting bolt, which passes through the outer shell and is threadedly connected to the rear liner. The adjusting bolt is rotatably connected to the outer shell, that is, the adjusting bolt rotates relative to the outer shell.

[0017] By adopting the above technical solution, rotating the adjusting bolt can drive the rear liner to slide along the rotation axis through the threaded transmission, without disassembling the core structure of the pump body, thus achieving precise fine adjustment of the rear liner position. After adjustment, the threaded engagement between the adjusting bolt and the outer shell and the rear liner can automatically lock the position, preventing the rear liner from shifting during operation. The operation is convenient and the positioning is reliable.

[0018] Optionally, a sealing gasket is fixed between the shaft seal assembly and the rear liner.

[0019] By adopting the above technical solution, the sealing gasket can fill the connection gap between the shaft seal assembly and the rear liner, prevent slurry from leaking from the connection between the two, further improve the overall sealing performance of the pump body, and at the same time, the sealing gasket can buffer the vibration when the two are linked, reduce wear, and extend the service life of the shaft seal assembly and the rear liner.

[0020] Optionally, a sealing ring is fixed between the end of the bushing and the impeller. The sealing ring is sleeved on the outer wall of the rotating shaft, and at the same time, the sealing ring is embedded and fixed on the inner wall of the bushing.

[0021] By adopting the above technical solution, the sealing ring can effectively prevent slurry in the pump cavity from entering the mating surface between the bushing and the rotating shaft, avoid solid particles from wearing the bushing and the rotating shaft, extend the service life of both, and further enhance the sealing effect of the pump body, reduce the risk of medium leakage, and ensure the stability and high efficiency of the slurry pump operation.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. The rear liner adjustment does not require disassembling the pump. Through the linkage structure between the shaft seal assembly and the rear liner and the adjusting bolts, the clearance between the rear liner and the impeller can be precisely adjusted, solving the problem of cumbersome and time-consuming adjustment in traditional structures and significantly improving the ease of operation. 2. The shaft seal assembly and the rear liner are detachably connected by fastening screws. When repairing or replacing the shaft seal assembly, there is no need to disassemble the core structure of the pump body. The semi-circular assembly tooling ensures installation accuracy and balances maintenance efficiency and assembly reliability. 3. The multiple sealing design of packing seal, gasket and sealing ring, combined with the wear-resistant protection of shaft sleeve, effectively blocks slurry leakage, reduces component wear, extends the overall service life of pump body, and ensures operational stability and high efficiency. Attached Figure Description

[0023] Figure 1 This is a partial structural diagram of an embodiment of this application.

[0024] In the diagram, 1 is the outer casing; 2 is the shaft seal assembly; 3 is the rear liner; 4 is the bushing; 5 is the sealing gasket; 6 is the impeller; 7 is the sealing ring; 8 is the rotating shaft; 9 is the assembly fixture; 10 is the fastening screw; and 11 is the adjusting bolt. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0026] This application discloses a shaft seal installation structure for a double-casing slurry pump, which aims to solve the problems of pump disassembly required for adjusting the rear liner of a traditional double-casing slurry pump and inconvenient shaft seal maintenance, while enhancing sealing performance and wear resistance.

[0027] refer to Figure 1 A double-casing slurry pump shaft seal installation structure includes an outer shell 1, an inner shell, an impeller 6, a rotating shaft 8, and a rear liner 3. The outer shell 1 and the inner shell are fixedly connected by bolts, together forming a pump cavity for containing slurry and ensuring the structural strength of the pump body. One end of the rotating shaft 8 extends to the outside of the pump cavity and is connected to an external motor via a coupling. The other end penetrates into the pump cavity and is fixedly connected to the impeller 6 via a key, enabling the rotating shaft 8 to drive the impeller 6 to rotate at high speed relative to the pump cavity, thereby realizing the transportation of slurry. Figure 1 The left side of the outer casing 1 is the outside, and the right side of the outer casing 1 is the inside of the pump chamber.

[0028] A bushing 4 is fixed to the rotating shaft 8. The bushing 4 is made of wear-resistant alloy material, with one end penetrating into the pump cavity and the other end located outside the pump cavity. The bushing 4 prevents the rotating shaft 8 from directly contacting the shaft seal assembly 2 and the slurry, reducing wear on the rotating shaft 8. The shaft seal assembly 2 is ring-fitted on the outer wall of the bushing 4. This shaft seal assembly 2 is a packing seal specifically for slurry pumps, filled with oil-impregnated asbestos packing, which can effectively seal the gap between the outer shell 1 and the bushing 4, preventing slurry from leaking out of the pump cavity.

[0029] The shaft seal assembly 2 and the rear liner 3 are fixedly connected by circumferentially evenly distributed fastening screws 10. Specifically, the fastening screws 10 penetrate the housing of the shaft seal assembly 2 and are threaded into the rear liner 3, ensuring a firm connection, enabling synchronous displacement, and facilitating subsequent disassembly and assembly. Simultaneously, a sealing gasket 5 is fixed between the mating surfaces of the shaft seal assembly 2 and the rear liner 3. This sealing gasket 5 is made of wear-resistant and corrosion-resistant rubber, which fills the connection gap between the two, preventing slurry leakage from the connection point, and also buffering vibrations during pump operation, reducing relative wear between the shaft seal assembly 2 and the rear liner 3.

[0030] The rear liner 3 is made of wear-resistant material and extends into the pump chamber from the side opposite to the shaft seal assembly 2. A suitable working clearance is reserved between it and the impeller 6. This clearance directly affects the operating efficiency of the slurry pump and the wear rate of its components. The rear liner 3 is slidably connected to the outer casing 1, with the sliding direction set along the length of the rotating shaft 8. This allows the rear liner 3 to move back and forth along the axial direction of the rotating shaft 8, thereby adjusting the clearance with the impeller 6. A limiting component is provided between the outer casing 1 and the rear liner 3. This limiting component is specifically an adjusting bolt 11. The adjusting bolt 11 passes through the side wall of the outer casing 1 along the axial direction of the rotating shaft 8 and is rotatably connected to the outer casing 1 via a bearing. That is, the adjusting bolt 11 can rotate relative to the outer casing 1 but cannot move axially. The end of the adjusting bolt 11 is threadedly connected to the rear liner 3. By rotating the adjusting bolt 11, the rear liner 3 can be axially slid via the threaded transmission, achieving precise fine-tuning of the clearance. After adjustment, the threaded engagement locks the position of the rear liner 3, preventing displacement during operation.

[0031] To ensure a uniform sealing gap between the shaft seal assembly 2 and the shaft sleeve 4, and to avoid localized wear or seal failure due to gap deviation, an assembly fixture 9 is inserted between the outer wall of the shaft sleeve 4 and the inner wall of the shaft seal assembly 2. The assembly fixture 9 has a semi-ring structure, and its curvature matches the curvature of the outer wall of the shaft sleeve 4. During assembly, it can be directly inserted between the shaft sleeve 4 and the shaft seal assembly 2 from the side to play a positioning role. After the fastening screws 10 lock the shaft seal assembly 2 and the rear liner 3, the assembly fixture 9 can be quickly removed from the side without affecting the subsequent operation of the pump body.

[0032] In addition, a sealing ring 7 is provided between the end of the bushing 4 near the impeller 6 and the impeller 6. The sealing ring 7 is wrapped around the outer wall of the rotating shaft 8 and is embedded in the inner wall of the bushing 4. This can effectively prevent slurry in the pump chamber from entering the mating surface between the bushing 4 and the rotating shaft 8, avoid solid particles from causing wear on the bushing 4 and the rotating shaft 8, and further enhance the sealing effect.

[0033] The assembly process of this embodiment is as follows: The bushing 4 is fixed to the rotating shaft 8 by interference fit. After the rotating shaft 8 and impeller 6 are assembled, the whole assembly is inserted into the pump cavity and the rotational connection and positioning are completed. Then, the sealing gasket 5 is attached to one side of the shaft seal assembly 2, and the shaft seal assembly 2 and the rear liner 3 are fixedly connected by the fastening screw 10 to form a linkage module. The semi-annular assembly fixture 9 is inserted from the side between the bushing 4 and the shaft seal assembly 2. The position of the linkage module is adjusted to ensure that the gap between the shaft seal assembly 2 and the bushing 4 is uniform. Then, the adjusting bolt 11 is inserted through the outer shell 1 and threadedly connected to the rear liner 3 to complete the assembly of the limiting part. Finally, the assembly fixture 9 is removed, and the gap between the rear liner 3 and the impeller 6 is finely adjusted to the appropriate value by adjusting the adjusting bolt 11. The inner shell and the outer shell 1 are fixedly connected to seal the pump cavity, and the overall assembly is completed.

[0034] The implementation principle of this application embodiment is as follows: During operation, the motor drives the impeller 6 to rotate through the rotating shaft 8. The slurry in the pump chamber is transported under the action of centrifugal force. The gap between the packing sealing shell 1 and the shaft sleeve 4 in the shaft seal assembly 2, the sealing gasket 5 and the sealing ring 7 respectively block the leakage channels at the connection and the mating surface between the shaft sleeve and the rotating shaft, thus achieving multiple seals. When the gap between the rear liner 3 and the impeller 6 increases due to wear, there is no need to disassemble the shell 1 and the inner shell. Only the adjusting bolt 11 needs to be rotated to drive the rear liner 3 and the shaft seal assembly 2 to slide synchronously along the axial direction, quickly correcting the gap. When it is necessary to repair or replace the shaft seal assembly 2, only the fastening screw 10 needs to be removed to separate the shaft seal assembly 2 from the rear liner 3. There is no need to disassemble the core structure of the pump body. The shaft seal assembly 2 can be directly taken out for maintenance or replacement, which is convenient and efficient.

[0035] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A shaft seal installation structure for a double-casing slurry pump, comprising an outer casing (1), an impeller (6), a rotating shaft (8), and an inner casing, wherein the outer casing (1) and the inner casing are fixedly arranged to form a pump cavity, one end of the rotating shaft (8) is connected to an external motor via a coupling, and the other end extends into the pump cavity and is fixed to the impeller (6), wherein the rotating shaft (8) and the impeller (6) are both rotatably arranged relative to the pump cavity, characterized in that: A bushing (4) is fixed on the rotating shaft (8). The bushing (4) extends into the pump chamber. A shaft seal assembly (2) is fitted on the bushing (4) to seal the gap between the outer shell (1) and the bushing (4). The shaft seal assembly (2) is fixedly connected to the rear liner (3). The rear liner (3) is slidably connected to the outer shell (1) and the sliding direction is set along the length of the rotating shaft (8). A limiting member is provided between the outer shell (1) and the rear liner (3) to adjust and lock the position of the rear liner (3).

2. The shaft seal installation structure for a double-casing slurry pump according to claim 1, characterized in that: The shaft seal assembly (2) is a packing seal for slurry pumps.

3. The shaft seal installation structure for a double-casing slurry pump according to claim 2, characterized in that: An assembly fixture (9) for limiting the uniformity of the gap between the bushing (4) and the shaft seal assembly (2) is inserted between the outer wall of the bushing (4).

4. The shaft seal installation structure for a double-casing slurry pump according to claim 3, characterized in that: The assembly fixture (9) is semi-circular.

5. The shaft seal installation structure for a double-casing slurry pump according to claim 2, characterized in that: A fastening screw (10) is provided between the shaft seal assembly (2) and the rear liner (3). The fastening screw (10) passes through the shaft seal assembly (2) and is threadedly connected to the rear liner (3).

6. The shaft seal installation structure for a double-casing slurry pump according to claim 1, characterized in that: The limiting component is an adjusting bolt (11). The adjusting bolt (11) passes through the outer shell (1) and is threadedly connected to the rear liner (3). The adjusting bolt (11) is rotatably connected to the outer shell (1), that is, the adjusting bolt (11) rotates relative to the outer shell (1).

7. The shaft seal installation structure for a double-casing slurry pump according to claim 5, characterized in that: A sealing gasket (5) is fixed between the shaft seal assembly (2) and the rear liner (3).

8. The shaft seal installation structure for a double-casing slurry pump according to claim 1, characterized in that: A sealing ring (7) is fixed between the end of the bushing (4) and the impeller (6). The sealing ring (7) is wrapped around the outer wall of the rotating shaft (8), and at the same time, the sealing ring (7) is embedded and fixed on the inner wall of the bushing (4).

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