Centrifugal pump with easy access

Abstract

The utility model relates to centrifugal pump technical field especially, it relates to a centrifugal pump convenient for overhauling. Including pump body, the installation cavity is formed in the pump body, and the sealing cavity with one end communication, the other end has the opening of the opening to the outside of pump body in installation cavity, a drive shaft, the drive shaft is arranged in the sealing cavity and extends to the installation cavity, an impeller, rotation setting in installation cavity and with drive shaft transmission connection, a dynamic sealing ring and a static sealing ring, dynamic sealing ring and static sealing ring all are set up on drive shaft, a sealing cover, detachably installed on the pump body is used for the opening of sealing cavity is blocked, static sealing ring fixed mounting is on the sealing cover, and dynamic sealing ring is detachably connected with drive shaft. The centrifugal pump provided by the utility model when needing overhauling or replacing the sealing assembly, does not need to dismantle whole pump body or disconnect drive shaft and external power source's connection, only needs to remove sealing cover can directly contact and replace sealing ring, and the overhaul process is simplified.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pump technology, and in particular to a centrifugal pump that is easy to maintain. Background Technology

[0002] Centrifugal pumps, widely used in industrial production and daily life, have an impeller as one of their core components, which drives the flow of liquid. The impeller is connected to an external power source via a drive shaft and rotates at high speed inside the pump body, generating centrifugal force to transport the liquid to a designated outlet. However, the connection point where the drive shaft passes through the pump casing is the most common leakage point for centrifugal pumps. To prevent liquid leakage, a mechanical seal assembly is usually installed at this location.

[0003] A typical mechanical seal assembly consists of a dynamic sealing ring and a static sealing ring. The dynamic sealing ring rotates with the drive shaft and fits tightly against the sealing surface of the static sealing ring, forming an effective sealing barrier. During long-term operation, the dynamic and static sealing rings will gradually wear down due to friction. Although elastic compensation elements are usually provided to maintain tight contact between the sealing surfaces, the sealing performance will significantly decrease when the wear reaches a certain level. At this point, the worn sealing ring must be repaired or replaced to ensure the normal operation of the centrifugal pump and the sealing effect.

[0004] However, current technologies for overhauling or replacing the mechanical seal assembly of centrifugal pumps often present challenges due to their complexity and time-consuming nature. Traditional maintenance procedures typically require technicians to first disassemble the pump casing and disconnect the external drive motor shaft from the pump's transmission shaft before the worn mechanical seal assembly can be removed for repair or replacement. This not only increases maintenance difficulty and labor intensity but also prolongs pump downtime, reducing overall equipment operating efficiency and availability. Therefore, existing technologies urgently need improvement to address these issues. Utility Model Content

[0005] This utility model discloses a centrifugal pump that is easy to maintain, aiming to solve the problem that the mechanical seal components of existing centrifugal pumps are complicated to operate and time-consuming, resulting in high maintenance difficulty and long downtime, thereby reducing the overall operating efficiency and availability of the equipment.

[0006] The technical solution of this utility model is as follows: This utility model discloses a centrifugal pump that is easy to maintain, comprising: a pump body having an internal mounting cavity for accommodating an impeller, and a sealing cavity having one end connected to the mounting cavity and the other end having an opening facing the outside of the pump body; a drive shaft passing through the sealing cavity and extending into the mounting cavity; an impeller rotatably disposed in the mounting cavity and drivenly connected to the drive shaft; a dynamic sealing ring and a static sealing ring, both of which are sleeved on the outside of the drive shaft and accommodated in the sealing cavity; and a sealing cover detachably mounted on the pump body to seal the opening of the sealing cavity; wherein the static sealing ring is fixedly mounted on the sealing cover, and the dynamic sealing ring is detachably connected to the drive shaft.

[0007] This technical solution involves fixing the static sealing ring to a detachable sealing cover and detachably connecting the dynamic sealing ring to the drive shaft. This allows for easy maintenance or replacement of the sealing components without disassembling the entire pump body or disconnecting the drive shaft from the external power source. Simply removing the sealing cover allows direct access to and replacement of the sealing ring, significantly simplifying the maintenance process, shortening repair time, and improving the maintenance efficiency and availability of the centrifugal pump.

[0008] Furthermore, the drive shaft is provided with a step; it also includes a spring, which is sleeved on the drive shaft, with its two ends abutting against the step and the dynamic sealing ring, respectively.

[0009] More specifically, in some embodiments, the outer circumferential surface of the drive shaft is provided with multiple guide strips; the inner circumferential surface of the dynamic sealing ring is provided with multiple guide grooves that cooperate with the multiple guide strips.

[0010] Preferably, the pump body includes a housing and an end cap; the sealing cavity is formed inside the housing, and the mounting cavity is formed inside the end cap; the housing and the end cap are detachably connected, and the sealing cap is mounted on the housing.

[0011] Furthermore, it also includes a first sealing ring and a third sealing ring; the first sealing ring is disposed between the sealing cover and the outer shell; the third sealing ring is disposed between the dynamic sealing ring and the drive shaft.

[0012] Furthermore, it also includes a second sealing ring disposed between the static sealing ring and the sealing cover.

[0013] Preferably, the end cap has an inlet and an outlet that communicate with the mounting cavity.

[0014] Furthermore, it also includes a pulley connected to one end of the drive shaft that extends out of the pump body.

[0015] Preferably, a base is formed at the bottom of the housing.

[0016] Preferably, the sealing cap is detachably mounted on the housing by bolts. Attached Figure Description

[0017] Figure 1 A schematic diagram of the overall structure of a centrifugal pump that is easy to maintain, provided for an embodiment of this application; Figure 2 A cross-sectional view of a centrifugal pump that is easy to maintain, provided as an embodiment of this application; Figure 3 This is an enlarged view of part A in image 2; Figure 4 This is an exploded structural diagram of the drive shaft and sealing assembly provided in an embodiment of this application.

[0018] The following are the labeling elements in the figure: 1. Outer shell; 11. Base; 12. Sealing cavity; 2. End cap; 21. Inlet; 22. Outlet; 23. Mounting cavity; 3. Drive shaft; 31. Pulley; 32. Step; 4. Impeller; 51. Sealing cover; 52. Static sealing ring; 53. Dynamic sealing ring; 531. Guide groove; 532. Guide strip; 54. Spring; 55. First sealing ring; 56. Second sealing ring; 57. Third sealing ring. Detailed Implementation

[0019] In existing technologies, overhauling or replacing the mechanical seal assembly of a centrifugal pump often involves complex operations and is time-consuming. Traditional maintenance procedures typically require technicians to first disassemble the pump casing and disconnect the external drive motor shaft from the pump's drive shaft before the worn mechanical seal assembly can be removed from the drive shaft for repair or replacement. This not only increases the difficulty and labor intensity of maintenance but also prolongs the pump's downtime, reducing the overall operating efficiency and availability of the equipment. Therefore, existing technologies urgently need improvement to address these issues.

[0020] Based on this, in order to improve the technical problem of the cumbersome maintenance process of centrifugal pumps in related technologies, the embodiments of this application provide the following solutions.

[0021] The following combination Figures 1-4 This application will be described in further detail.

[0022] This embodiment discloses a centrifugal pump that is easy to maintain, comprising: a pump body having an internal mounting cavity 23 for accommodating an impeller 4, and a sealing cavity 12 having one end connected to the mounting cavity 23 and the other end having an opening facing the outside of the pump body; a drive shaft 3 passing through the sealing cavity 12 and extending into the mounting cavity 23; an impeller 4 rotatably disposed within the mounting cavity 23 and connected to the drive shaft 3; a dynamic sealing ring 53 and a static sealing ring 52, both of which are sleeved on the outside of the drive shaft 3 and accommodated within the sealing cavity 12; and a sealing cover 51 detachably mounted on the pump body to seal the opening of the sealing cavity 12; wherein the static sealing ring 52 is fixedly mounted on the sealing cover 51, and the dynamic sealing ring 53 is detachably connected to the drive shaft 3.

[0023] As can be seen from the above, the centrifugal pump provided in this application embodiment, which is easy to maintain, has a static sealing ring 52 fixedly installed on the sealing cover 51. This means that when the sealing cover 51 is removed, the static sealing ring 52 will be removed along with it, without any additional operation. The static sealing ring 52 can be connected to the sealing cover 51 by press-fit, bonding, or screw fixing to ensure its stability. The dynamic sealing ring 53 is detachably connected to the drive shaft 3. This connection method allows the dynamic sealing ring 53 to be easily removed from the drive shaft 3 after the static sealing ring 52 and the sealing cover 51 are removed. For example, the dynamic sealing ring 53 can be connected to the drive shaft 3 by sliding fit, snap ring fixing, or threaded connection to facilitate quick disassembly and assembly. This unique installation configuration greatly simplifies the maintenance process of the sealing components, allowing maintenance personnel to replace the seals without large-scale disassembly of the pump.

[0024] In some embodiments, please refer to the following: Figure 2 and Figure 3 The drive shaft 3 is provided with a step 32; it also includes a spring 54, which is sleeved on the drive shaft 3, and the two ends of the spring 54 abut against the step 32 and the dynamic sealing ring 53 respectively.

[0025] This configuration, due to the continuous axial force applied by spring 54 to the dynamic sealing ring 53, effectively solves the problem of unstable sealing contact pressure that may exist in the basic design. This not only significantly improves the sealing reliability between the dynamic sealing ring 53 and the static sealing ring 52, reducing the risk of liquid leakage, but also automatically compensates for wear of the seals, thereby extending the service life of the entire mechanical seal device. In addition, this structure also helps to maintain a tight fit of the sealing surfaces when the pump body vibrates or the drive shaft 3 experiences slight axial movement, ensuring the long-term stable operation of the centrifugal pump.

[0026] Optionally, in some embodiments, please refer to Figure 3 and Figure 4The outer circumferential surface of the drive shaft 3 is provided with multiple guide bars 532; the inner circumferential surface of the dynamic sealing ring 53 is provided with multiple guide grooves 531 that cooperate with the multiple guide bars 532.

[0027] With this configuration, the dynamic sealing ring 53 can slide smoothly along the axial direction of the drive shaft 3 when subjected to the axial thrust of the spring 54, while its circumferential movement is restricted by the cooperation of the guide strip 532 and the guide groove 531. It is precisely because of this guiding cooperation that the dynamic sealing ring 53 can always maintain a relatively stationary state relative to the drive shaft 3 when the drive shaft 3 rotates at high speed, avoiding seal failure or accelerated wear caused by rotation or wobbling. Therefore, a reliable guiding relationship is established between the dynamic sealing ring 53 and the drive shaft 3, effectively preventing undesirable relative rotation or wobbling of the dynamic sealing ring 53 during operation. This not only significantly improves the sealing stability between the dynamic sealing ring 53 and the static sealing ring 52, extending the service life of the seals, but also reduces the equipment failure rate caused by seal failure, thereby improving the overall reliability and operating efficiency of the centrifugal pump.

[0028] Optionally, please refer to Figure 1 and Figure 2 The pump body includes a housing 1 and an end cap 2; a sealing cavity 12 is formed inside the housing 1, and a mounting cavity 23 is formed inside the end cap 2; the housing 1 and the end cap 2 are detachably connected, and the sealing cap 51 is mounted on the housing 1.

[0029] This configuration, with the detachable connection between the outer casing 1 and the end cover 2, allows for the inspection or replacement of the dynamic sealing ring 53 and the static sealing ring 52 inside the outer casing 1 first, followed by the inspection or replacement of the impeller 4 inside the end cover 2, avoiding the complex operation of disassembling multiple components simultaneously. The sealing cover 51 is mounted on the outer casing 1, making the disassembly and installation of the dynamic sealing ring 53 and the static sealing ring 52 more convenient, without requiring the removal of the end cover 2.

[0030] In some embodiments, please refer to Figure 2 and Figure 3 It also includes a first sealing ring 55 and a third sealing ring 57; the first sealing ring 55 is disposed between the sealing cover 51 and the outer shell 1; the third sealing ring 57 is disposed between the dynamic sealing ring 53 and the drive shaft 3.

[0031] With this configuration, the first sealing ring 55 enhances the seal between the sealing cover 51 and the outer casing 1, preventing fluid leakage from the joint; the third sealing ring 57 improves the sealing effect between the dynamic sealing ring 53 and the drive shaft 3, reducing fluid leakage along the drive shaft 3. By providing the first sealing ring 55 between the sealing cover 51 and the outer casing 1, and the third sealing ring 57 between the dynamic sealing ring 53 and the drive shaft 3, multiple sealing protections can be formed, effectively preventing fluid leakage from these joints, thereby improving the overall sealing performance of the centrifugal pump.

[0032] Optionally, in some embodiments, please refer to Figure 2 and Figure 3 It also includes a second sealing ring 56, which is disposed between the static sealing ring 52 and the sealing cover 51.

[0033] With this configuration, when the sealing cover 51 is installed on the pump body, the second sealing ring 56 is compressed, generating a sealing force that fills the tiny gap between the static sealing ring 52 and the sealing cover 51, preventing fluid leakage. Because the second sealing ring 56 has good elasticity, it can effectively compensate for fit errors and vibrations between the static sealing ring 52 and the sealing cover 51, ensuring reliable sealing. Furthermore, the second sealing ring 56 can also absorb some vibration energy, reducing noise.

[0034] Optionally, please refer to Figure 1 and Figure 2 The end cap 2 has an inlet 21 and an outlet 22 that communicate with the mounting cavity 23.

[0035] This configuration, with the inlet 21 and outlet 22 on the end cover 2 communicating with the mounting cavity 23, allows fluid to smoothly enter and be discharged from the centrifugal pump, thus enabling the centrifugal pump to operate normally. When the impeller 4 rotates within the mounting cavity 23, the fluid enters the mounting cavity 23 from the inlet 21, is accelerated and pressurized under the action of the impeller 4, and then is discharged from the outlet 22.

[0036] In some embodiments, please refer to Figure 1 It also includes a pulley 31, which is connected to one end of the drive shaft 3 that extends out of the pump body.

[0037] With this configuration, the pulley 31 can be fixed to the drive shaft 3 by means of key connection, bolt connection or spline connection. By replacing the pulley 31 with different diameters, the speed of the drive shaft 3 can be changed, thereby adjusting the speed of the impeller 4, and thus changing the flow rate and head of the centrifugal pump.

[0038] In some embodiments, please refer to Figure 1 The bottom of the outer casing 1 has a base 11.

[0039] This configuration, by setting a base 11 at the bottom of the outer casing 1, can effectively improve the overall stability of the centrifugal pump, reduce displacement caused by vibration or unbalanced forces, thereby ensuring the normal operation of the centrifugal pump and extending its service life.

[0040] In some embodiments, please refer to Figure 1 and Figure 2 The sealing cover 51 is detachably mounted on the housing 1 by bolts.

[0041] This design ensures that the bolted connection has high connection strength and reliability, guaranteeing that the sealing cover 51 will not loosen or fall off during use, thus ensuring the normal operation of the centrifugal pump. Secondly, the bolted connection has good disassembly capability. When it is necessary to inspect or replace the components inside the sealing cavity 12, the sealing cover 51 can be easily removed simply by loosening the bolts, without the need for special tools or complicated operations, thereby greatly improving the convenience of maintenance.

[0042] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A centrifugal pump that is easy to maintain, characterized in that, include: A pump body having an internal mounting cavity (23) for accommodating an impeller (4) and a sealing cavity (12) having one end connected to the mounting cavity (23) and the other end having an opening toward the outside of the pump body; A drive shaft (3) passes through the sealed cavity (12) and extends into the mounting cavity (23); An impeller (4) is rotatably disposed within the mounting cavity (23) and is connected to the drive shaft (3) for transmission. A dynamic sealing ring (53) and a static sealing ring (52) are provided, both of which are sleeved on the outside of the drive shaft (3) and housed in the sealing cavity (12); A sealing cap (51), which is detachably mounted on the pump body, is used to seal the opening of the sealing cavity (12); The static sealing ring (52) is fixedly installed on the sealing cover (51), and the dynamic sealing ring (53) is detachably connected to the transmission shaft (3).

2. The centrifugal pump for easy maintenance according to claim 1, characterized in that, The drive shaft (3) is provided with a step (32); it also includes a spring (54), which is sleeved on the drive shaft (3), and the two ends of the spring (54) abut against the step (32) and the dynamic sealing ring (53) respectively.

3. The centrifugal pump for easy maintenance according to claim 1 or 2, characterized in that, The outer circumferential surface of the drive shaft (3) is provided with a plurality of guide strips (532); the inner circumferential surface of the dynamic sealing ring (53) is provided with a plurality of guide grooves (531) that cooperate with the plurality of guide strips (532).

4. The centrifugal pump for easy maintenance according to claim 1, characterized in that, The pump body includes a housing (1) and an end cap (2); the sealing cavity (12) is formed inside the housing (1), and the mounting cavity (23) is formed inside the end cap (2); the housing (1) and the end cap (2) are detachably connected, and the sealing cap (51) is mounted on the housing (1).

5. The centrifugal pump for easy maintenance according to claim 4, characterized in that, It also includes a first sealing ring (55) and a third sealing ring (57); the first sealing ring (55) is disposed between the sealing cover (51) and the outer shell (1); the third sealing ring (57) is disposed between the dynamic sealing ring (53) and the drive shaft (3).

6. The centrifugal pump for easy maintenance according to claim 1, characterized in that, It also includes a second sealing ring (56), which is disposed between the static sealing ring (52) and the sealing cap (51).

7. The centrifugal pump for easy maintenance according to claim 4, characterized in that, The end cap (2) is provided with an inlet (21) and an outlet (22) that communicate with the mounting cavity (23).

8. The centrifugal pump for easy maintenance according to claim 1, characterized in that, It also includes a pulley (31) connected to one end of the drive shaft (3) extending out of the pump body.

9. The centrifugal pump for easy maintenance according to claim 4, characterized in that, A base (11) is formed at the bottom of the outer casing (1).

10. The centrifugal pump for easy maintenance according to claim 4, characterized in that, The sealing cap (51) is detachably mounted on the outer casing (1) by bolts.

Images