A centrifugal pump mechanical seal cooling water filtration device

Abstract

This utility model provides a cooling water filtration device for a centrifugal pump mechanical seal, including a centrifugal pump body, a first bent pipe, a second bent pipe, and an external threaded pipe. A mechanical seal is installed along the shaft of the centrifugal pump body, and a cooling water tank is provided inside the mechanical seal. An inlet pipe is installed at the inlet end of the cooling water tank. A three-way outlet valve is installed between the front end of the inlet pipe and the first bent pipe. First positioning rings are fixed to the outside of the water inlets on both sides of the first bent pipe. The second bent pipe is welded to the front end of the first bent pipe by two welding rods. This design solves the problem that the original centrifugal pump mechanical seal cooling water filter screen cleaning requires stopping the machine and using tools to remove multiple bolts, which is time-consuming, labor-intensive, and affects continuous operation. This utility model designs a cooling water filtration structure that can switch filtration units without stopping the machine, forming a parallel dual-path filtration system that serves as a backup for each other. This is the core of achieving non-stop maintenance.

Description

Technical Field

[0001] This utility model relates to a cooling water filtration device for a centrifugal pump mechanical seal, belonging to the field of centrifugal pump technology. Background Technology

[0002] The mechanical seal of a centrifugal pump is a critical component preventing leakage of the pump's internal medium along the shaft. During high-speed rotation, it generates significant frictional heat, necessitating the circulation of clean cooling water for lubrication, cooling, and flushing to ensure its normal operating life. If the cooling water contains particulate matter, fibers, or other impurities, these can enter between the sealing surfaces, causing scratches, wear, or even failure, leading to media leakage, equipment downtime, and environmental pollution. Currently, most known centrifugal pump mechanical seal cooling water filtration devices employ a single Y-type or T-type filter. Its basic structure includes a filter housing, a cylindrical or basket-type filter screen installed inside the housing, and an end cap to cover the filter housing. The end cap is typically connected to the filter housing by multiple bolts.

[0003] However, this structure has the following main drawbacks: when the filter screen becomes clogged and needs cleaning, the water pump must be shut down, and the entire system must be stopped. Then, multiple bolts must be removed using tools to open the end cover before the filter screen can be removed for cleaning. This process causes production interruptions, affecting continuous operation, and can cause significant losses, especially in critical processes. Furthermore, removing the bolts is time-consuming and labor-intensive. Therefore, there is an urgent need for a centrifugal pump mechanical seal cooling water filtration device to solve these problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a cooling water filtration device for a centrifugal pump mechanical seal, thereby solving the problems mentioned in the background. This utility model designs a cooling water filtration structure that allows switching of filtration units without stopping the machine, forming a parallel dual-path filtration system that serves as a backup for each other. This is the core of achieving non-stop maintenance.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a centrifugal pump mechanical seal cooling water filtration device, comprising a centrifugal pump body, a first bent pipe, a second bent pipe, and an external threaded pipe. A mechanical seal is installed along the shaft of the centrifugal pump body. A cooling water tank is provided inside the mechanical seal. An inlet pipe is installed at the inlet end of the cooling water tank. A three-way outlet valve is installed between the front end of the inlet pipe and the first bent pipe. First positioning rings are fixed externally at the left and right inlets of the first bent pipe. A second bent pipe is welded to the front end of the first bent pipe via two welding rods. Internal threads are provided inside the left and right inlets of the first bent pipe and the left and right outlets of the second bent pipe. The two bends have two externally fixed positioning rings at the water outlets on both sides. Two externally threaded pipes are provided, each with a rubber filling ring fixed at both ends. The rear ends of the two externally threaded pipes are screwed onto the water inlets on the left and right sides of the first bend, respectively. The front ends of the two externally threaded pipes are screwed onto the water outlets on the left and right sides of the second bend, respectively. A second internally threaded ring and a first internally threaded ring are threaded onto the front and rear ends of both externally threaded pipes. A metal fixing ring is welded to the front end of each of the two externally threaded pipes. A magnetic ring is magnetically attached to the front end of each of the two metal fixing rings. A filter element is fixed to the rear end of each of the two magnetic rings, and a filter screen is longitudinally clamped inside each of the two filter elements.

[0006] Furthermore, an outlet pipe is installed at the drain end of the cooling water tank.

[0007] Furthermore, a cooling water pipe is installed at the middle of the front end of the second bent pipe via a three-way inlet valve.

[0008] Furthermore, rubber rings are embedded in the inner sides of both second positioning rings and both first positioning rings.

[0009] Furthermore, welding nuts are welded to the middle of the outer sides of both of the aforementioned externally threaded pipes.

[0010] Furthermore, the two first internal threaded rings are respectively tightly attached to the two first positioning rings, and the two second internal threaded rings are respectively tightly attached to the two second positioning rings.

[0011] The beneficial effects of this utility model are as follows: This utility model provides a centrifugal pump mechanical seal cooling water filtration device. Because it incorporates a three-way outlet valve, a first bent pipe, a second bent pipe, a three-way inlet valve, a cooling water pipe, a welding rod, internal threads, a first positioning ring, a rubber ring, a second positioning ring, an external threaded pipe, a welding nut, a first internal threaded ring, a second internal threaded ring, a metal fixing ring, a magnetic ring, a filter screen, and a filter element, its structure is reasonable. It designs a cooling water filtration structure that allows switching of filtration units without stopping the machine, forming a parallel dual-path filtration system with mutual backups. This is the core of achieving maintenance without stopping the machine. Furthermore, the manual double-threaded locking and elastic filling sealing structure facilitates the disassembly and cleaning of the filter element and filter screen after use, saving time and effort and making it highly practical. Attached Figure Description

[0012] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0013] Figure 1 This is a schematic diagram of the structure of a centrifugal pump mechanical seal cooling water filtration device according to the present invention;

[0014] Figure 2 This is a schematic diagram of the internal thread structure of a centrifugal pump mechanical seal cooling water filtration device according to the present invention;

[0015] Figure 3 This is a schematic diagram of the disassembly structure of the external threaded pipe of a centrifugal pump mechanical seal cooling water filtration device according to the present invention.

[0016] In the diagram: 1-Centrifugal pump body, 2-Mechanical seal, 3-Outlet pipe, 4-Inlet pipe, 5-Three-way outlet valve, 6-First bend pipe, 7-Second bend pipe, 8-Three-way inlet valve, 9-Cooling water pipe, 10-Welding rod, 11-Internal thread, 12-First positioning ring, 13-Rubber ring, 14-Second positioning ring, 15-External threaded pipe, 16-Welding nut, 17-First internal threaded ring, 18-Rubber filler ring, 19-Second internal threaded ring, 20-Metal retaining ring, 21-Magnetic ring, 22-Filter screen, 23-Filter element. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0018] Please see Figures 1-3This utility model provides a technical solution: a centrifugal pump mechanical seal cooling water filtration device, including a centrifugal pump body 1, a first bent pipe 6, a second bent pipe 7, and an external threaded pipe 15. A mechanical seal 2 is installed along the shaft of the centrifugal pump body 1. A cooling water tank is provided inside the mechanical seal 2. An inlet pipe 4 is installed at the inlet end of the cooling water tank. A three-way outlet valve 5 is installed between the front end of the inlet pipe 4 and the first bent pipe 6. First positioning rings 12 are fixed to the outside of the left and right inlets of the first bent pipe 6. A second bent pipe 7 is welded to the front end of the first bent pipe 6 via two welding rods 10. Internal threads 11 are provided inside the left and right inlets of the first bent pipe 6 and the left and right outlets of the second bent pipe 7. Second positioning rings 14 are fixed to the outside of the left and right outlets of the second bent pipe 7. Two external threaded pipes 15 are provided. Rubber filling rings 18 are fixed at both the front and rear ends of the two external threaded pipes 15. The rear ends of the two external threaded pipes 15 are respectively screwed into the water inlet on the left and right sides of the first bend pipe 6. The front ends of the two external threaded pipes 15 are respectively screwed into the water outlet on the left and right sides of the second bend pipe 7. The front and rear ends of the two external threaded pipes 15 are respectively fitted with a second internal threaded ring 19 and a first internal threaded ring 17 by threads. The front ends of the two external threaded pipes 15 are each welded with a metal fixing ring 20. The front ends of the two metal fixing rings 20 are each magnetically attracted and fixed with a magnetic ring 21. The rear ends of the two magnetic rings 21 are each fixed with a filter element 23. The filter screen 22 is longitudinally clamped inside the two filter elements 23. This design solves the problem that the original centrifugal pump mechanical seal cooling water cooling screen cleaning requires stopping the machine and using tools to remove multiple bolts, which is time-consuming, labor-intensive, and affects continuous operation.

[0019] As the first embodiment of this utility model: an outlet pipe 3 is installed at the drain end of the cooling water tank, which forms a return channel for the cooling system of the mechanical seal 2. It discharges the cooling water that has completed its cooling and lubrication tasks and may carry heat, ensuring that the cooling water circulates in the system and continuously dissipates heat for the mechanical seal 2, preventing heat accumulation that could lead to seal failure.

[0020] The cooling water pipe 9 is installed at the middle of the front end of the second bend pipe 7 through a three-way inlet valve 8. The added cooling water pipe 9 is the main inlet for external cooling water. The three-way inlet valve 8 is one of the core components of this utility model. By rotating its valve core, the water entering from the cooling water pipe 9 can be flexibly guided to the filter unit on the left or right side, which is the key to realizing the "one in use, one standby" non-stop switching function.

[0021] Rubber rings 13 are embedded in the inner sides of both second positioning rings 14 and both first positioning rings 12. The added rubber rings 13 serve as static seals. When the first inner threaded ring 17 and the second inner threaded ring 19 are tightened and the first positioning ring 12 and the second positioning ring 14 are pressed together, the rubber rings 13 undergo elastic deformation, effectively filling the micro gaps in the metal contact surface, preventing cooling water from leaking from the connection between the external threaded pipe 15 and the bent pipe, and ensuring the reliability of the system seal.

[0022] Both externally threaded pipes 15 are fitted with weld nuts 16 welded to their outer center, providing a standard wrench operating surface. When disassembling or installing the externally threaded pipes 15, the operator can use a wrench to hold the weld nuts 16 and easily apply torque to screw the externally threaded pipes 15 in or out, greatly facilitating the disassembly and assembly of the filter unit and saving time and effort.

[0023] Two first internal threaded rings 17 are tightly fitted to two first positioning rings 12, and two second internal threaded rings 19 are tightly fitted to two second positioning rings 14. The addition of the first and second internal threaded rings 17 and 19 forms a "manual double-threaded locking structure." By tightening the first internal threaded ring 17 backwards and the second internal threaded ring 19 forwards, they press the first and second positioning rings 12 and 14 from the front and rear sides respectively, thus firmly fixing the entire external threaded pipe 15 and its internal filter assembly between the first bent pipe 6 and the second bent pipe 7. This structure not only provides a strong connection but also allows for assembly and disassembly much faster than traditional multi-bolt connections.

[0024] As a second embodiment of this utility model: assuming the initial state is that the left filter unit is working and the right unit is on standby. Adjust the three-way inlet valve 8 and the three-way outlet valve 5 so that the valve core channel connects to the cooling water pipe 9 → the left external threaded pipe 15 → the left side of the first bend pipe 6 → the three-way outlet valve 5.

[0025] External cooling water flows sequentially through: cooling water pipe 9 → three-way inlet valve 8 → left external threaded pipe 15. Within the left external threaded pipe 15, the cooling water first passes through filter screen 22 for coarse filtration, and then through filter element 23 for fine filtration.

[0026] The filtered clean cooling water continues to flow through: the left side of the first bend pipe 6 → the three-way outlet valve 5 → the inlet pipe 4, and finally enters the cooling water tank of the mechanical seal 2. After completing cooling and lubrication, it is discharged from the outlet pipe 3. At this time, the right-side filter unit is filled with static pressure water and is in standby mode.

[0027] When the filter element 23 and filter screen 22 of the left-side filter unit become clogged, resulting in insufficient cooling water flow, a switching operation is required. The operator quickly rotates the handles of the three-way inlet valve 8 and the three-way outlet valve 5 to switch the flow from the left to the right. After the switch, the cooling water is immediately filtered by the right-side filter unit and supplied to the mechanical seal 2. The entire process is completed within seconds, and the centrifugal pump does not need to be stopped, ensuring continuous production.

[0028] When cleaning the left-side filter unit: use a wrench to hold the left-side welded nut 16 and loosen the first inner threaded ring 17 forward. Then, turn the left-side welded nut 16 backward to fully screw the outer rear end of the left-side outer threaded pipe 15 into the left side of the first bent pipe 6. At this point, the front opening of the left-side outer threaded pipe 15 will be exposed. The operator can then easily pull out the filter element 23 along with the magnetic ring 21 from the metal retaining ring 20 from inside the front end of the outer threaded pipe 15 for disassembly and cleaning, and rinse or replace the filter screen 22 and filter element 23. After cleaning, reinstall the filter element assembly into the left-side outer threaded pipe 15 using magnetic force, then reinstall the outer threaded pipe 15 back in its original position, and reverse the above steps. At this point, the left-side unit is cleaned and installed, and is ready for use as a backup unit. Through the alternating use and cleaning of the two filter units, continuous and uninterrupted filtration protection of the cooling water for the mechanical seal 2 is achieved.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0030] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A centrifugal pump mechanical seal cooling water filtration device, comprising a centrifugal pump body (1), a first bend pipe (6), a second bend pipe (7), and an external threaded pipe (15), characterized in that: The centrifugal pump body (1) is equipped with a mechanical seal (2) along its shaft. The mechanical seal (2) has a cooling water tank inside. A water inlet pipe (4) is installed at the water inlet end of the cooling water tank. A three-way outlet valve (5) is installed between the front end of the water inlet pipe (4) and the first bent pipe (6). A first positioning ring (12) is fixed to the outside of the water inlet on both sides of the first bent pipe (6). A second bent pipe (7) is welded to the front end of the first bent pipe (6) by two welding rods (10). Internal threads (11) are provided inside the water inlet on both sides of the first bent pipe (6) and the water outlet on both sides of the second bent pipe (7). A second positioning ring (14) is fixed to the outside of the water outlet on both sides of the second bent pipe (7). There are two external threaded pipes (15). Both ends of the spiral pipe (15) are fixed with rubber filling rings (18). The two ends of the spiral pipe (15) are respectively screwed into the water inlet on the left and right sides of the first bend pipe (6) by threads. The two ends of the spiral pipe (15) are respectively screwed into the water outlet on the left and right sides of the second bend pipe (7) by threads. The two ends of the spiral pipe (15) are respectively fitted with a second inner spiral ring (19) and a first inner spiral ring (17) by threads. The two ends of the spiral pipe (15) are respectively welded with metal fixing rings (20) inside. The two ends of the metal fixing rings (20) are respectively fixed with magnet rings (21) by magnetic attraction. The two ends of the magnet rings (21) are respectively fixed with filter elements (23). The two filter elements (23) are respectively longitudinally fitted with filter screens (22).

2. The centrifugal pump mechanical seal cooling water filtration device according to claim 1, characterized in that: An outlet pipe (3) is installed at the drain end of the cooling water tank.

3. The centrifugal pump mechanical seal cooling water filtration device according to claim 1, characterized in that: The second bent pipe (7) has a cooling water pipe (9) installed in the middle of its front end through a three-way inlet valve (8).

4. The centrifugal pump mechanical seal cooling water filtration device according to claim 1, characterized in that: Rubber rings (13) are embedded in the inner sides of both second positioning rings (14) and both first positioning rings (12).

5. A centrifugal pump mechanical seal cooling water filtration device according to claim 1, characterized in that: Welding nuts (16) are welded to the middle of the outside of both externally threaded pipes (15).

6. The centrifugal pump mechanical seal cooling water filtration device according to claim 1, characterized in that: The two first internal threaded rings (17) are respectively attached to the two first positioning rings (12), and the two second internal threaded rings (19) are respectively attached to the two second positioning rings (14).

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