Leakage-free self-priming pump

Abstract

This utility model relates to a leak-free self-priming pump. The pump has a vertical structure and employs a magnetic drive with a shielded sleeve. An inner magnet is fixed to the upper end of the pump shaft, and an upper bearing is located below the inner magnet. The pump shaft is supported by the upper and lower bearings, both of which are rolling bearings. The shielded sleeve, combined with other pump components, completely isolates the pump rotor from the outside environment, thus eliminating the need for a shaft seal. An impeller is fixed to the lower end of the pump shaft, and self-priming guide vanes are provided on the outer circumference of the impeller. The impeller and self-priming guide vanes cooperate to create a vacuum self-priming effect. A buffer chamber is provided between the impeller and the lower bearing. A pump cover support and an inner flow channel housing are located below the pump cover. An inlet and an outlet are respectively located in the lower part of the pump body. The pump body, inner flow channel housing, pump cover support, and self-priming guide vanes cooperate to form the pump's inlet and outlet flow channels, respectively. The inlet and outlet flow channels are not connected; the inlet flow channel is connected to the inlet, and the outlet flow channel is connected to the outlet.

Description

Technical Field

[0001] This invention relates to a self-priming pump, and more particularly to a vertical self-priming pump that requires a leak-free shaft seal. Background Technology

[0002] Self-priming pumps are a type of self-priming centrifugal pump. They are characterized by their compact structure, convenient operation, stable running, long service life, and strong self-priming capability. No foot valve is required in the pipeline; only a certain amount of priming liquid needs to be present in the pump body before operation. However, existing self-priming pumps suffer from leakage problems, which seriously affect their operational reliability. Summary of the Invention

[0003] This invention provides a leak-free self-priming pump that effectively prevents media leakage within the pump body, thereby solving problems caused by leakage.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] The self-priming pump of this invention has a vertical structure and is magnetically driven. An outer magnet is mounted on the motor shaft, and an inner magnet is fixed to the upper end of the pump shaft. A shielding sleeve is placed between the inner and outer magnets. The outer and inner magnets cooperate to transmit the driving torque required by the pump. The inner magnet is fixed to the upper end of the pump shaft. An upper bearing is located below the inner magnet and is mounted in a bearing housing. The bearing housing has heat dissipation fins on its outer periphery. An upper bearing cap fixes the upper bearing in the bearing housing and is also fixed to the pump shaft. The upper bearing is a rolling bearing. The pump cover fits into the pump body, supporting the pump cover. The main body of the pump cover is located inside the pump body. A lower bearing is installed at the bottom of the pump cover, and a lower bearing cap fixes the lower bearing. The lower bearing is mounted on the pump shaft, which is supported by the upper and lower bearings. The lower bearing is a rolling bearing. A bearing housing is installed above the pump cover, and the shielding sleeve is installed on the bearing housing. Sealing elements are provided on the mating surfaces of the shielding sleeve, bearing housing, pump cover, and pump body. The shielding sleeve, combined with other pump components, completely isolates the pump rotor assembly from the outside environment, thus eliminating the need for shaft seals and achieving leak-free operation. The upper and lower bearings utilize maintenance-free rolling bearings, significantly reducing pump maintenance.

[0006] A fan blade is installed inside the outer magnet, and heat dissipation fins are installed on the outer periphery of the bearing housing. When the motor is working, a pressure difference is generated between the outer magnet and the shielding sleeve. Air enters from the ventilation hole and flows from the outer periphery of the shielding sleeve to the heat dissipation fins of the bearing housing, thus cooling the shielding sleeve and the bearing housing.

[0007] A pump cover bracket is installed below the pump cover. An inner flow channel housing is installed between the pump cover bracket and the pump body. The pump shaft passes through the pump cover bracket, and the impeller is installed below the pump cover bracket. Seals are installed on the mating surfaces of the pump body, the inner flow channel housing, the pump cover bracket, and the self-priming guide vane to prevent leakage. An inlet and an outlet are respectively located at the lower part of the pump body. The pump body, the inner flow channel housing, the pump cover bracket, and the self-priming guide vane cooperate to form the pump's inlet and outlet flow channels, respectively. The inlet and outlet flow channels are not connected; the inlet flow channel is connected to the inlet, and the outlet flow channel is connected to the outlet.

[0008] The impeller is fixed to the lower end of the pump shaft by an impeller nut. Self-priming guide vanes are provided on the outer circumference of the impeller. When the pump is working, the impeller and the self-priming guide vanes cooperate to form a vacuum self-priming effect on the water inlet channel and water inlet pipe.

[0009] A buffer chamber is provided between the impeller and the lower bearing. The pump cover bracket and the pump cover form a buffer chamber. The buffer chamber plays a role in pressure regulation. When the pressure at the impeller rises, the liquid enters the buffer chamber, and the air pressure in the buffer chamber rises. As the liquid continues to rise to a certain position, the air pressure and liquid pressure are balanced, and the liquid level will no longer rise, thus protecting the bearing.

[0010] The impeller is equipped with a back ring and a balance hole to reduce impeller back pressure and adjust axial force, thereby improving rotor operation stability.

[0011] Self-priming guide vanes have multiple blades that are unevenly distributed. Through a special design and arrangement of these blades, the pump achieves self-priming capability. At least one guide vane has a clearance A between its inlet edge and the impeller, with a smaller clearance A, placing the guide vane inlet edge close to the impeller. Simultaneously, at least one guide vane has a clearance B between its inlet edge and the impeller, with clearance B being larger than clearance A, resulting in a larger distance between the guide vane inlet edge and the impeller. By changing A, B, and the guide vane arrangement, different self-priming performance characteristics can be obtained.

[0012] All components inside the pump body can be pulled out of the pump body along with the pump cover, making maintenance extremely convenient.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This vertical self-priming pump is magnetically driven, requiring no shaft seal and achieving complete leak-free operation;

[0015] 2. Apart from the pump head fluid components, only the upper and lower bearings in the drive mechanism are wear parts, and very few parts can be damaged;

[0016] 3. It adopts maintenance-free rolling bearings, with no easily damaged parts, and requires minimal maintenance.

[0017] 4. All components inside the pump body can be pulled out of the pump body along with the pump cover, making maintenance extremely convenient. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of a leak-free self-priming pump according to this utility model;

[0019] Figure 2 This is a schematic diagram of another leak-free self-priming pump according to this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of a self-priming guide vane.

[0021] In the diagram: 1. Motor, 1-1. Motor shaft, 2. Motor bracket, 3. Outer magnet, 3-1. Fan blade, 3-2. Ventilation hole, 4. Shielding sleeve, 5. Inner magnet, 6. Upper bearing cover, 7. Upper bearing, 8. Bearing housing, 8-1. Heat dissipation fins, 9. Rotor assembly, 10. Pump body, 11. Pump cover, 12. Pump shaft, 13. Lower bearing, 14. Lower bearing cover, 15. Pump cover bracket, 16. Inner flow channel housing, 17. Inlet, 18. Buffer chamber, 19. Self-priming guide vane, 19-1. Guide vane blade, 20. Impeller, 20-1. Balance hole, 20-2. Rear inlet ring, 21. Inlet flow channel, 22. Outlet flow channel, 23. Outlet. Detailed Implementation Specific Implementation Example 1:

[0023] like Figure 1 As shown, the self-priming pump of this invention has a vertical structure. The impeller 20 draws water from below. The pump is magnetically driven, with the motor 1 located at the top. An outer magnet 3 is mounted on the motor shaft 1-1, and an inner magnet 5 is fixed to the upper end of the pump shaft 12. A shielding sleeve 4 is provided between the inner magnet 5 and the outer magnet 3. The outer magnet 3 and the inner magnet 5 cooperate to transmit the torque of the motor 1. An upper bearing 7 is provided near the lower part of the inner magnet 5. The upper bearing 7 is installed in a bearing seat 8, and heat dissipation fins 8-1 are provided on the outer periphery of the bearing seat 8. The upper bearing cap 6 fixes the upper bearing 7 in the bearing seat 8 and also fixes the upper bearing 7 to the pump shaft 12. The upper bearing 7 is a maintenance-free rolling bearing. The shielding sleeve 4 is connected to the bearing housing 8, and the bearing housing 8 is connected to the pump cover 11. The pump cover 11 and the pump body 10 cooperate to support the pump cover 11 on the pump body 10. The main body of the pump cover 11 is located inside the pump body 10. A lower bearing 13 is installed at the lower part of the pump cover 11, and a lower bearing cap 14 fixes the lower bearing 13. The lower bearing 13 is installed on the pump shaft 12, which is supported by the upper bearing 7 and the lower bearing 13. The lower bearing 13 is a rolling bearing. Seals are provided on the mating surfaces of the shielding sleeve 4, the bearing housing 8, the pump cover 11, and the pump body 10. The shielding sleeve 4, combined with other pump components, completely isolates the pump rotor assembly 9 from the outside world, thus eliminating the need for shaft seals and achieving complete leak-free operation. The upper bearing 7 and the lower bearing 13 are maintenance-free rolling bearings, significantly reducing pump maintenance.

[0024] A fan blade 3-1 is installed inside the outer magnet 3. When the motor 1 is working, a pressure difference is generated between the outer magnet 3 and the shielding sleeve 4. Air enters from the ventilation hole 3-2 and flows from the outer periphery of the shielding sleeve 4 to the heat dissipation fins 8-1 of the bearing seat 8. The air cools the shielding sleeve 4 and the bearing seat 8.

[0025] Below the pump cover 11, one end of the pump cover bracket 15 is connected to the pump cover 11. An inner flow channel housing 16 is provided between the pump cover bracket 15 and the pump body 10. The inner flow channel housing 16 is connected to the lower part of the pump cover 11. The pump shaft 12 passes through the pump cover bracket 15. The impeller 20 is installed below the pump cover bracket 15. The other end of the pump cover bracket 15 is connected to the self-priming guide vane 19. Seals are provided on the mating surfaces between the pump body 10, the inner flow channel housing 16, the pump cover bracket 15, and the self-priming guide vane 19 to prevent leakage. The lower part of the pump body 10 is provided with an inlet 17 and an outlet 23. The pump body 10 and the inner flow channel housing 16 cooperate to form the pump inlet flow channel 21. The inner flow channel housing 16, the pump cover bracket 15 and the self-priming guide vane 19 cooperate to form the pump outlet flow channel 22. The inlet flow channel 21 and the outlet flow channel 22 are not connected. The inlet flow channel 21 is connected to the inlet 17, and the outlet flow channel 22 is connected to the outlet 23.

[0026] The impeller 20 is fixed to the lower end of the pump shaft 12 by an impeller nut. A self-priming guide vane 19 is provided on the outer periphery of the impeller 20 and is installed in the inner flow channel housing 16. When the pump is working, the impeller 20 and the self-priming guide vane 19 cooperate to form a vacuum self-priming effect on the inlet flow channel 21 and the inlet 17. The pumped liquid flows into the impeller 20 from the inlet 17 through the inlet flow channel 21, flows out of the impeller 20 and into the self-priming guide vane 19, then flows from the self-priming guide vane 19 into the outlet flow channel 22, and flows out of the pump body 10 from the outlet 23.

[0027] A buffer chamber 18 is provided between the impeller 20 and the lower bearing 13. The buffer chamber 18 is located above the impeller 20 and below the lower bearing 13. The pump cover bracket 15, the pump cover 11, and the self-priming guide vane 19 form a buffer chamber 18. The buffer chamber 18 plays a role in pressure regulation. When the pressure at the impeller 20 rises, the liquid enters the buffer chamber 18, and the air pressure in the buffer chamber 18 rises. As the liquid continues to rise to a certain position, the air pressure and the liquid pressure are balanced, and the liquid level will no longer rise, thus protecting the bearing.

[0028] The impeller 20 is provided with a balance hole 20-1 and a rear end ring 20-2 to reduce the impeller back pressure and adjust the axial force, thereby improving the stability of rotor operation.

[0029] The self-priming guide vane 19 has multiple blades that are unevenly distributed. Through the special design and arrangement of the guide vane blades 19-1, the pump has a self-priming function. At least one guide vane blade 19-1 has a gap A between its inlet edge and the impeller. Gap A is relatively small, and the inlet edge of the guide vane blade 19-1 is close to the impeller. At the same time, at least one guide vane blade 19-1 has a gap B between its inlet edge and the impeller. Gap B is larger than gap A, and the distance between the inlet edge of the guide vane blade 19-1 and the impeller is relatively large.

[0030] All components inside the pump body can be pulled out of the pump body along with the pump cover, making maintenance extremely convenient. Specific Implementation Example 2:

[0032] like Figure 2 As shown, the self-priming pump of the present invention has a vertical structure. The impeller 20 draws water from above. The pump is magnetically driven, with the motor 1 located at the top. An outer magnet 3 is mounted on the motor shaft 1-1, and an inner magnet 5 is fixed to the upper end of the pump shaft 12. A shielding sleeve 4 is provided between the inner magnet 5 and the outer magnet 3. The outer magnet 3 and the inner magnet 5 cooperate to transmit the torque of the motor 1. An upper bearing 7 is provided below the inner magnet 5. The upper bearing 7 is installed in a bearing seat 8, and heat dissipation fins 8-1 are provided on the outer periphery of the bearing seat 8. The upper bearing cap 6 fixes the upper bearing 7 in the bearing seat 8 and also fixes the upper bearing 7 to the pump shaft 12. The upper bearing 7 is a maintenance-free rolling bearing. The shielding sleeve 4 is connected to the bearing housing 8, and the bearing housing 8 is connected to the pump cover 11. The pump cover 11 and the pump body 10 cooperate to support the pump cover 11 on the pump body 10. The main body of the pump cover 11 is located inside the pump body 10. A lower bearing 13 is installed at the lower part of the pump cover 11, and a lower bearing cap 14 fixes the lower bearing 13. The lower bearing 13 is installed on the pump shaft 12, which is supported by the upper bearing 7 and the lower bearing 13. The lower bearing 13 is a rolling bearing. Sealing elements are provided on the mating surfaces of the shielding sleeve 4, bearing housing 8, pump cover 11, and pump body 10. The shielding sleeve 4, combined with other pump components, completely isolates the pump rotor assembly 9 from the outside environment, thus eliminating the need for shaft seals and achieving zero leakage. The upper bearing 7 and the lower bearing 13 are maintenance-free rolling bearings, significantly reducing pump maintenance.

[0033] A fan blade 3-1 is installed inside the outer magnet 3. When the motor 1 is working, a pressure difference is generated between the outer magnet 3 and the shielding sleeve 4. Air enters from the ventilation hole 3-2 and flows from the outer periphery of the shielding sleeve 4 to the heat dissipation fins 8-1 of the bearing seat 8. The air cools the shielding sleeve 4 and the bearing seat 8.

[0034] Below the pump cover 11, one end of the pump cover bracket 15 is connected to the pump cover 11. An inner flow channel housing 16 is provided between the pump cover bracket 15 and the pump body 10. One end of the inner flow channel housing 16 is connected to the bottom of the pump cover 11, and the other end of the inner flow channel housing 16 is connected to the self-priming guide vane 19. The pump shaft 12 passes through the pump cover bracket 15, and the impeller 20 is installed below the pump cover bracket 15. Seals are provided on the mating surfaces between the pump body 10, the inner flow channel housing 16, the pump cover bracket 15, and the self-priming guide vane 19 to prevent leakage.

[0035] The lower part of the pump body 10 is provided with an inlet 17 and an outlet 23. The pump body 10, together with the inner flow channel shell 16 and the self-priming guide vane 19, forms the pump outlet flow channel 22. The pump cover bracket 15, together with the inner flow channel shell 16, forms the pump inlet flow channel 21. The inlet flow channel 21 and the outlet flow channel 22 are not connected. The inlet flow channel 21 is connected to the inlet 17, and the outlet flow channel 22 is connected to the outlet 23.

[0036] The impeller 20 is fixed to the lower end of the pump shaft 12 by an impeller nut. A self-priming guide vane 19 is provided on the outer periphery of the impeller 20 and is installed in the pump body 10. When the pump is working, the impeller 20 and the self-priming guide vane 19 cooperate to form a vacuum self-priming effect on the inlet channel 21 and the inlet 17. The pumped liquid flows from the inlet 17 into the impeller 20 through the inlet channel 21, flows through the impeller 20 into the self-priming guide vane 19, then flows from the self-priming guide vane 19 into the outlet channel 22, and finally flows out of the pump body 10 from the outlet 23.

[0037] A buffer chamber 18 is provided between the impeller 20 and the lower bearing 13. The buffer chamber 18 is located above the impeller 20 and below the lower bearing 13. The pump cover bracket 15 and the pump cover 11 form a buffer chamber 18. The buffer chamber 18 plays a role in pressure regulation. When the pressure at the impeller 20 rises, liquid enters the buffer chamber 18, and the air pressure in the buffer chamber 18 rises. As the liquid continues to rise to a certain position, the air pressure and liquid pressure are balanced, and the liquid level will no longer rise, thus protecting the bearing.

[0038] The impeller 20 is provided with a balance hole 20-1 and a rear end ring 20-2 to reduce the impeller back pressure and adjust the axial force, thereby improving the stability of rotor operation.

[0039] The self-priming guide vane 19 has multiple blades that are unevenly distributed. Through the special design and arrangement of the guide vane blades 19-1, the pump has a self-priming function. At least one guide vane blade 19-1 has a gap A between its inlet edge and the impeller. Gap A is relatively small, and the inlet edge of the guide vane blade 19-1 is close to the impeller. At the same time, at least one guide vane blade 19-1 has a gap B between its inlet edge and the impeller. Gap B is larger than gap A, and the distance between the inlet edge of the guide vane blade 19-1 and the impeller is relatively large.

[0040] All components inside the pump body can be pulled out of the pump body along with the pump cover, making maintenance extremely convenient.

[0041] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.

[0042] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this utility model without departing from the spirit and scope of the embodiments of this utility model. Therefore, if these modifications and variations to the embodiments of this utility model fall within the scope of the claims of this utility model and their equivalents, then this utility model also intends to include these modifications and variations.

Claims

1. A leak-free self-priming pump characterized by, The leak-free self-priming pump has a vertical structure. The pump uses magnetic drive to generate the required driving torque. The magnetic drive includes an outer magnet (3), an inner magnet (5), and a shielding sleeve (4). The shielding sleeve (4) is combined with other parts of the pump to isolate the rotor assembly (9) from the outside. The inner magnet (5) is fixed to the upper end of the pump shaft (12). The pump shaft (12) has two support points, namely the upper bearing (7) and the lower bearing (13). The upper bearing (7) and the lower bearing (13) are rolling bearings; the upper bearing (7) is set below the inner magnet (5), and the upper bearing (7) is fixed on the pump shaft (12). An impeller (20) is installed at the lower end of the pump shaft (12), and a self-priming guide vane (19) is installed on the outside of the impeller (20). Self-priming is achieved through the cooperation of the impeller (20) and the self-priming guide vane (19); a buffer chamber (18) is provided between the lower bearing (13) and the impeller (20).

2. A self-priming pump without leakage according to claim 1, characterized in that, The upper bearing (7) and the lower bearing (13) are maintenance-free rolling bearings.

3. A self-priming pump without leakage according to claim 1, characterized in that, Inside the outer magnet (3), there are fan blades (3-1) and ventilation holes (3-2), and on the outer periphery of the bearing seat (8), there are heat dissipation fins (8-1).

4. A self-priming pump without leakage according to claim 1, characterized in that, The impeller (20) draws water from below, and the buffer chamber (18) is located above the impeller (20) and below the lower bearing (13). The pump cover bracket (15) forms a buffer chamber (18) between the pump cover (11) and the self-priming guide vane (19).

5. A self-priming pump without leakage according to claim 1, characterized in that, The impeller (20) draws water from above, and the buffer chamber (18) is located above the impeller (20) and below the lower bearing (13). The pump cover bracket (15) and the pump cover (11) form a buffer chamber (18).

6. The leak-free self-priming pump according to claim 1, characterized in that, The impeller (20) draws water from below. The pump body (10) is provided with an inlet (17) and an outlet (23) at the bottom. The pump body (10) and the inner flow channel shell (16) cooperate to form the pump's inlet flow channel (21). The inner flow channel shell (16) cooperates with the pump cover bracket (15) and the self-priming guide vane (19) to form the pump's outlet flow channel (22). The inlet flow channel (21) and the outlet flow channel (22) are not connected. The inlet flow channel (21) is connected to the inlet (17), and the outlet flow channel (22) is connected to the outlet (23).

7. A self-priming pump without leakage according to claim 1, characterized in that, The impeller (20) draws water from above. The pump body (10) is provided with an inlet (17) and an outlet (23) at the bottom. The pump body (10), the inner flow channel shell (16) and the self-priming guide vane (19) cooperate to form the pump's outlet flow channel (22). The pump cover bracket (15) cooperates with the inner flow channel shell (16) to form the pump's inlet flow channel (21). The inlet flow channel (21) and the outlet flow channel (22) are not connected. The inlet flow channel (21) is connected to the inlet (17), and the outlet flow channel (22) is connected to the outlet (23).

8. A self-priming pump without leakage according to claim 1, characterized in that, The self-priming guide vane (19) has multiple blades that are not evenly distributed. At least one guide vane blade (19-1) has a gap of A between its inlet edge and the impeller (20). At the same time, at least one guide vane blade (19-1) in the self-priming guide vane (19) has a gap of B between its inlet edge and the impeller (20). Gap B is larger than gap A.

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