Built-in water-cooling shaft seal structure of marine horizontal centrifugal pump

Abstract

The utility model relates to centrifugal pump shaft seal structure field especially point to a marine horizontal centrifugal pump built -in water cooling shaft seal structure, including direct drive motor, the output of direct drive motor is connected with the pump body, the shaft seal body is installed in the pump body, the side close to direct drive motor of the pump body is equipped with cooling groove, the fixedly connected with water inlet pipe on the pump body, one side fixedly connected with drive shell of water inlet pipe, the middle part rotationally connected with the shaft of drive shell, the fixedly connected with the impeller on the outer wall of shaft, the rear end fixedly connected with filter shell of drive shell, fixedly connected with the mounting plate in filter shell. The utility model, through setting up drive shell, shaft, impeller, cylinder type filter screen, connecting plate, cleaning rod and brush structure mutual cooperation, can in the use process of cylinder type filter screen, through the surface dirt of brush to its timely cleaning, avoids the problem that the mesh is blocked, and it is convenient and easy.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pump shaft seal structure, and in particular to a built-in water-cooled shaft seal structure for a marine horizontal centrifugal pump. Background Technology

[0002] Marine horizontal centrifugal pumps have shaft seals that are cooled by using the material drawn by the centrifugal pump as a coolant. This method eliminates the need for a separate coolant. However, the liquid material drawn by the centrifugal pump may contain impurities, which can clog the coolant pipes and scratch the inside of the marine horizontal centrifugal pump.

[0003] When applying for this utility model, the applicant, through a search, discovered a Chinese patent that discloses "a built-in water-cooled shaft seal structure for a marine horizontal centrifugal pump, comprising a main body, a shaft seal body installed inside the main body, a cooling tank provided on the main body, a liquid outlet pipe connected to the back of the main body, a drain pipe fixedly connected to the right side of the liquid outlet pipe, a filter box connected to the right end of the drain pipe, a filter cylinder provided on the inner wall of the filter box, a cooling box fixedly connected to the right side of the filter box, a cooler embedded in the top of the cooling box, a conduit fixedly connected to the right side of the cooling box, and a liquid inlet pipe fixedly connected to the right end of the conduit." The application number is "202420191856.0". This patent can filter and cool the liquid material used to cool the shaft seal body, thereby improving the cooling effect of the shaft seal body, enhancing its performance, and preventing wear of the main body by impurities.

[0004] However, the applicant discovered that as the device continues to operate, the amount of debris produced by the filter cartridge in the above patent will gradually increase, which can easily cause the filter screen to become clogged. This can lead to a continuous increase in water pressure, which can easily damage the filter screen and affect the filtration efficiency. Based on this, we propose an improved marine horizontal centrifugal pump with a built-in water-cooled shaft seal structure. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a built-in water-cooled shaft seal structure for a marine horizontal centrifugal pump.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a marine horizontal centrifugal pump with a built-in water-cooled shaft seal structure, including a direct-drive motor, the output end of which is connected to a pump body, a shaft seal body installed inside the pump body, a cooling tank provided inside the pump body near the direct-drive motor, a water inlet pipe fixedly connected to the pump body, a drive housing fixedly connected to one side of the water inlet pipe, a rotating shaft rotatably connected to the middle of the drive housing, an impeller fixedly connected to the outer wall of the rotating shaft, a filter housing fixedly connected to the rear end of the drive housing, a mounting plate fixedly connected inside the filter housing, a mounting cap threaded onto the mounting plate, a cylindrical filter screen fixedly connected to one end of the mounting cap, the output end of the drive housing communicating with the inside of the filter housing via a pipe, one end of the rotating shaft penetrating the filter housing and fixedly connected to a connecting plate, a cleaning rod fixedly connected to the other end of the connecting plate, a brush fixedly connected to the outer wall of the cleaning rod, a liquid inlet pipe fixedly connected to the lower end of the filter housing, and the other end of the liquid inlet pipe fixedly sleeved inside the water inlet of the cooling tank.

[0007] With the above technical solution, the cylindrical filter screen can be cleaned of its surface debris in a timely manner by brushing during use, avoiding the problem of mesh clogging, which is convenient and time-saving.

[0008] As a further description of the above technical solution:

[0009] The other end of the cooling tank is fixedly connected to a return pipe, the other end of which is connected to the pump body, and a one-way valve is rotatably connected to the return pipe.

[0010] With the above technical solution, the coolant entering the cooling tank cools the shaft seal body and then re-enters the pump body through the return pipe, while the one-way valve can prevent liquid backflow.

[0011] As a further description of the above technical solution:

[0012] The impeller has multiple blades, and the multiple blades are evenly distributed inside the drive housing.

[0013] With the above technical solution, after the liquid enters the drive housing, it will drive the impeller to rotate as it flows through it, thereby driving the shaft to rotate.

[0014] As a further description of the above technical solution:

[0015] The cleaning rod and the brush are provided in pairs, with the two cleaning rods respectively positioned at the top and bottom of the cylindrical filter screen, and the two brushes respectively positioned to fit against the outer wall of the cylindrical filter screen.

[0016] Through the above technical solution, the cleaning rod drives the brush to rotate around the cylindrical filter screen, thereby cleaning the surface of the cylindrical filter screen through the brush.

[0017] As a further description of the above technical solution:

[0018] The end of the filter housing away from the drive housing is threaded with a sealing cap, and the lower end of the filter housing is threaded with a sealing plug.

[0019] Using the above technical solution, the cylindrical filter screen can be removed by opening the sealing cover.

[0020] As a further description of the above technical solution:

[0021] The sealing plug and the liquid inlet pipe are respectively located on both sides of the mounting plate, and the sealing cover is located on one side of the liquid inlet pipe.

[0022] With the above technical solution, the sealing plug is located near the water inlet side of the mounting plate, and the sealing cover is located near the drainage side of the mounting plate. Opening the sealing plug allows for the cleaning of the filtered residue.

[0023] This utility model has the following beneficial effects:

[0024] 1. Compared with the prior art, this marine horizontal centrifugal pump has a built-in water-cooled shaft seal structure. By setting up a drive housing, rotating shaft, impeller, cylindrical filter screen, connecting plate, cleaning rod and brush structure to cooperate with each other, it can effectively use the water pressure difference to drive the impeller to rotate during the water intake process of the filter housing, which in turn drives the rotating shaft to rotate. The rotating shaft drives the cleaning rod to rotate through the connecting plate, which in turn drives the brush to rotate around the surface of the cylindrical filter screen. This can clean the debris adhering to the filter screen surface in time, avoiding excessive accumulation that causes blockage and, in severe cases, damage to the filter screen.

[0025] 2. Compared with the prior art, this marine horizontal centrifugal pump has a built-in water-cooled shaft seal structure. By setting up a filter shell, mounting plate, mounting cap, sealing plug and sealing cover structure, it can filter the cooling liquid used to input into the cooling tank, preventing impurities from entering. At the same time, it is convenient to directly disassemble the sealing plug to clean the debris inside the filter shell. It is also convenient to open the sealing cover and remove the cylindrical filter screen from the mounting plate by rotating the mounting cap for maintenance, which is convenient and time-saving. Attached Figure Description

[0026] Figure 1 This is a bottom view of the internal water-cooled shaft seal structure of a marine horizontal centrifugal pump proposed in this utility model.

[0027] Figure 2 This is a side view of a marine horizontal centrifugal pump with an internal water-cooled shaft seal structure proposed in this utility model.

[0028] Figure 3 This is a side view of the internal structure of a marine horizontal centrifugal pump with a built-in water-cooled shaft seal structure proposed in this utility model.

[0029] Figure 4 This is a diagram of the internal structure of the other side of a marine horizontal centrifugal pump with a built-in water-cooled shaft seal structure proposed in this utility model.

[0030] Legend:

[0031] 1. Direct-drive motor; 2. Pump body; 3. Shaft seal body; 4. Cooling tank; 5. Return pipe; 6. Check valve; 7. Inlet pipe; 8. Drive housing; 9. Rotary shaft; 10. Impeller; 11. Filter housing; 12. Mounting plate; 13. Tubular filter screen; 14. Mounting cap; 15. Connecting plate; 16. Cleaning rod; 17. Brush; 18. Sealing plug; 19. Sealing cover; 20. Liquid inlet pipe. Detailed Implementation

[0032] Reference Figure 1-4 This utility model provides a marine horizontal centrifugal pump with an internal water-cooled shaft seal structure: It includes a direct-drive motor 1, the output end of which is connected to a pump body 2. A shaft seal body 3 is installed inside the pump body 2. A cooling tank 4 is provided inside the pump body 2 near the direct-drive motor 1. A water inlet pipe 7 is fixedly connected to the pump body 2. A drive housing 8 is fixedly connected to one side of the water inlet pipe 7. A rotating shaft 9 is rotatably connected to the middle of the drive housing 8. An impeller 10 is fixedly connected to the outer wall of the rotating shaft 9. A filter housing 11 is fixedly connected to the rear end of the drive housing 8. A mounting plate 12 is fixedly connected inside the filter housing 11. A mounting cap 14 is threaded onto the mounting plate 12. A cylindrical filter screen 13 is fixedly connected to one end of the mounting cap 14. 3 and the mounting cap 14 are integrated structures. When disassembling the cylindrical filter screen 13, simply rotate the mounting cap 14 to remove it from the mounting plate 12. The output end of the drive housing 8 is connected to the filter housing 11 through a pipe. The liquid in the inlet pipe 7 first enters the drive housing 8, and then enters the filter housing 11 through the pipe for filtration. One end of the rotating shaft 9 passes through the filter housing 11 and is fixedly connected to the connecting plate 15. The other end of the connecting plate 15 is fixedly connected to the cleaning rod 16. A brush 17 is fixedly connected to the outer wall of the cleaning rod 16. The lower end of the filter housing 11 is fixedly connected to the liquid inlet pipe 20. The other end of the liquid inlet pipe 20 is fixedly sleeved in the water inlet of the cooling tank 4.

[0033] Through the above technical solution, the cylindrical filter screen 13 can be cleaned of surface debris in a timely manner by the brush 17 during use, avoiding the problem of mesh blockage, which is convenient and time-saving.

[0034] The other end of the cooling tank 4 is fixedly connected to a return pipe 5. The other end of the return pipe 5 is connected to the pump body 2. A one-way valve 6 is rotatably connected to the return pipe 5. After the coolant entering the cooling tank 4 cools the shaft seal body 3, it re-enters the pump body 2 through the return pipe 5. The one-way valve 6 can prevent liquid backflow.

[0035] The impeller 10 has multiple blades, which are evenly distributed inside the drive housing 8. When the liquid enters the drive housing 8 and flows through the impeller 10, it will cause the impeller to rotate, thereby causing the shaft 9 to rotate.

[0036] There are two cleaning rods 16 and two brushes 17. The two cleaning rods 16 are respectively positioned at the top and bottom of the cylindrical filter screen 13. The two brushes 17 are both set to fit against the outer wall of the cylindrical filter screen 13. The cleaning rods 16 drive the brushes 17 to rotate around the cylindrical filter screen 13, so that the surface of the cylindrical filter screen 13 can be cleaned by the brushes 17.

[0037] The filter housing 11 is threaded with a sealing cap 19 at the end away from the drive housing 8, and a sealing plug 18 is threaded with the lower end of the filter housing 11. The cylindrical filter screen 13 can be removed by opening the sealing cap 19.

[0038] The sealing plug 18 and the liquid inlet pipe 20 are respectively located on both sides of the mounting plate 12, and the sealing cover 19 is located on one side of the liquid inlet pipe 20. The sealing plug 18 is located near the water inlet side of the mounting plate 12, and the sealing cover 19 is located near the drainage side of the mounting plate 12. Opening the sealing plug 18 can clean the filtered residue.

[0039] Working principle: When the device is in use, when the liquid enters the pump body 2 through the inlet pipe 7, some of the liquid used for cooling enters the drive housing 8 at the same time, and then enters the filter housing 11 from the other end. It is filtered for impurities through the cylindrical filter screen 13, and then enters the cooling tank 4 through the liquid inlet pipe 20. Finally, it flows over the surface of the shaft seal body 3 to cool it, and then flows back into the pump body 2 through the return pipe 5. During this process, when the liquid passes through the drive housing 8, due to the water pressure, it will drive the impeller 10 to rotate, which in turn drives the connecting plate 15 to rotate through the rotating shaft 9. This, in turn, drives the brush 17 to rotate around the surface of the cylindrical filter screen 13 through the cleaning rod 16 to clean it, so as to prevent impurities from clogging the mesh and affecting the filtration effect. When it is necessary to clean the impurities later, simply unscrew the sealing plug 18 to remove the impurities from the filter housing 11. After unscrewing the sealing cover 19, the cylindrical filter screen 13 can be removed from the mounting plate 12 for maintenance by rotating the mounting cap 14. It is convenient and time-saving.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A marine horizontal centrifugal pump with an internal water-cooled shaft seal structure, comprising a direct-drive motor (1), wherein the output end of the direct-drive motor (1) is connected to a pump body (2), characterized in that: A shaft seal body (3) is installed inside the pump body (2). A cooling groove (4) is provided inside the pump body (2) near the direct-drive motor (1). A water inlet pipe (7) is fixedly connected to the pump body (2). A drive housing (8) is fixedly connected to one side of the water inlet pipe (7). A rotating shaft (9) is rotatably connected to the middle of the drive housing (8). An impeller (10) is fixedly connected to the outer wall of the rotating shaft (9). A filter housing (11) is fixedly connected to the rear end of the drive housing (8). A mounting plate (12) is fixedly connected inside the filter housing (11). A mounting cap is threaded onto the mounting plate (12). (14) One end of the mounting cap (14) is fixedly connected to a cylindrical filter screen (13). The output end of the drive housing (8) is connected to the filter housing (11) through a pipe. One end of the rotating shaft (9) passes through the filter housing (11) and is fixedly connected to a connecting plate (15). The other end of the connecting plate (15) is fixedly connected to a cleaning rod (16). A brush (17) is fixedly connected to the outer wall of the cleaning rod (16). The lower end of the filter housing (11) is fixedly connected to an inlet pipe (20). The other end of the inlet pipe (20) is fixedly sleeved in the water inlet of the cooling tank (4).

2. The built-in water-cooled shaft seal structure for a marine horizontal centrifugal pump according to claim 1, characterized in that: The other end of the cooling tank (4) is fixedly connected to a return pipe (5), the other end of the return pipe (5) is connected to the pump body (2), and a one-way valve (6) is rotatably connected to the return pipe (5).

3. The built-in water-cooled shaft seal structure for a marine horizontal centrifugal pump according to claim 1, characterized in that: The impeller (10) has multiple blades, and the multiple blades are evenly distributed in the drive housing (8).

4. The built-in water-cooled shaft seal structure for a marine horizontal centrifugal pump according to claim 1, characterized in that: The number of cleaning rods (16) and brushes (17) is two, and the two cleaning rods (16) are respectively located at the upper and lower positions of the cylindrical filter screen (13), and the two brushes (17) are both attached to the outer wall of the cylindrical filter screen (13).

5. The built-in water-cooled shaft seal structure for a marine horizontal centrifugal pump according to claim 1, characterized in that: The filter housing (11) is threaded with a sealing cap (19) at one end away from the drive housing (8), and a sealing plug (18) is threaded at the lower end of the filter housing (11).

6. The built-in water-cooled shaft seal structure for a marine horizontal centrifugal pump according to claim 5, characterized in that: The sealing plug (18) and the inlet pipe (20) are respectively located on both sides of the mounting plate (12), and the sealing cover (19) is located on one side of the inlet pipe (20).

Images