High stability anti-cavitation centrifugal pump

Abstract

The utility model provides a kind of high-stability anti-cavitation centrifugal pump, including motor and pump body, impeller is provided in pump body, the output end of motor is provided with output shaft, it is fixed with impeller and is inserted into the inside of pump body, inlet and outlet are provided on pump body, pre-inducer is provided in water inlet inside, pre-inducer is set on output shaft, extension pipe is further provided on the water inlet outer end of pump body, pre-inducer is set in extension pipe, by setting pre-inducer, before liquid enters impeller, give liquid a smaller, pressure promotion, so that the liquid pressure that enters contact impeller will not be lower than saturated vapor pressure, so that liquid loses the condition of vaporization, solve the generation of cavitation.

Description

Technical Field

[0001] This utility model relates to water pumps, and more particularly to a highly stable anti-cavitation centrifugal pump. Background Technology

[0002] When a water pump is working, the pumped liquid is prone to cavitation, which means that vapor bubbles are generated in the liquid and flow with the liquid. When the bubbles collapse on the impeller surface, the surrounding liquid will impact the metal surface at a very high frequency. The metal surface will peel off due to fatigue. This phenomenon is generally called cavitation.

[0003] Currently, Chinese patent CN208966613U discloses a high-stability water pump, including a base, a base mounted on the base, a pump body and a motor mounted on the base. A shock-absorbing device and a shock-absorbing elastic ball are provided between the lower end face of the base and the upper end face of the base. The shock-absorbing device includes multiple buffer rods mounted on the upper end face of the base and buffer springs mounted on the upper end faces of the buffer rods. The lower end face of the base is provided with buffer holes for the buffer springs to be inserted and for the buffer rods to be slidably inserted.

[0004] The aforementioned patent still has shortcomings. The water pump achieves high stability and high reliability through the shock absorption device installed at the bottom of the base, but it cannot solve the problem of cavitation. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a highly stable anti-cavitation centrifugal pump, which has the function of reducing cavitation phenomena.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a high-stability anti-cavitation centrifugal pump, including a motor and a pump body, wherein an impeller is provided in the pump body, an output shaft is provided at the output end of the motor, which extends into the pump body and is fixed to the impeller, an inlet and an outlet are provided on the pump body, a front-mounted inducer is provided inside the inlet, the front-mounted inducer is provided on the output shaft, and an extension pipe is also provided at the outer end of the inlet of the pump body, wherein the front-mounted inducer is provided inside the extension pipe.

[0007] Preferably, the inner wall of the front inducer wheel has a central hole, and the front inducer wheel is sleeved on the output shaft through the central hole. Both the output shaft and the central hole have keyways, and a flat key is disposed in the keyway. The output shaft also has a first fixing thread, which, together with a nut, fixes the front inducer wheel on the output shaft.

[0008] Preferably, the output shaft is further provided with a second fixing thread, and the output shaft is also provided with a fixing sleeve. The inner side of the fixing sleeve is provided with an internal thread, which cooperates with the second fixing thread and fixes the impeller on the output shaft. The tail of the front inducer abuts against the fixed shaft end away from the impeller.

[0009] Preferably, the extension tube is detachably mounted on the pump body by screws.

[0010] Preferably, a sealing groove is also provided on the inner side of the extension tube, and a sealing ring is provided in the sealing groove, with the sealing ring abutting against the side end of the water inlet.

[0011] Preferably, the extension pipe is further provided with a connecting water pipe at its side end, and a clamp is provided on the outside of the connecting water pipe for additional fixation of the connecting water pipe.

[0012] Preferably, the hoop is composed of a main frame and a sub-frame. A connecting iron rod is fixedly installed on the main frame, and a rubber sheet is also provided on the inner side between the sub-frame and the main frame.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. By setting a pre-induced impeller, a small pressure boost is added to the liquid before it enters the impeller, so that the pressure of the liquid entering the contact impeller will not be lower than the saturated vapor pressure, thereby depriving the liquid of the conditions for vaporization and solving the problem of cavitation. 2. The detachable installation of the front inducer and extension tube facilitates the disassembly and replacement of the extension tube and the front inducer, reducing the maintenance cost of the centrifugal pump; 3. By installing rubber sheets on the inside of the main frame and the auxiliary frame, the vibration transmitted from the connecting iron rod is reduced, thereby increasing the stability of the pump body. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an embodiment; Figure 2 Cross-sectional view of the embodiment Figure 1 ; Figure 3 This is a schematic diagram of the front-mounted inducer wheel; Figure 4 Cross-sectional view of the embodiment Figure 2 ; Figure 5 This is a schematic diagram of the structure for connecting water pipes; Figure 6 This is a schematic diagram of the hoop structure.

[0015] Reference numerals in the attached drawings: 1. Motor; 2. Pump body; 3. Impeller; 4. Inlet; 5. Outlet; 6. Front inducer; 7. Extension pipe; 8. Center hole; 9. Keyway; 10. Flat key; 11. First fixing thread; 12. Second fixing thread; 13. Fixing bushing; 14. Sealing groove; 15. Sealing ring; 16. Connecting water pipe; 17. Hoop; 18. Main frame; 19. Sub-frame; 20. Connecting iron rod; 21. Rubber sheet; 22. Output shaft. Detailed Implementation

[0016] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, so that the technical solution of this utility model can be more easily understood and mastered.

[0017] A high-stability anti-cavitation centrifugal pump includes a motor 1 and a pump body 2. An impeller 3 is installed inside the pump body 2. An output shaft 22 is installed at the output end of the motor 1, which extends into the pump body 2 and is fixed to the impeller 3. An inlet 4 and an outlet 5 are provided on the pump body 2. A front inducer 6 is installed inside the inlet 4 and is installed on the output shaft 22. An extension pipe 7 is also provided at the outer end of the inlet 4 of the pump body 2. The front inducer 6 is installed inside the extension pipe 7 and an axial flow propeller is installed on the front inducer 6.

[0018] When motor 1 starts, output shaft 22 begins to rotate at high speed, driving impeller 3 and front inducer 6, which are fixed to it, to rotate synchronously. The rotation of front inducer 6 in extension tube 7 pre-pressurizes and guides the liquid entering pump body 2, effectively improving the flow state of the liquid and reducing the probability of cavitation.

[0019] The inner wall of the front inducer wheel 6 is provided with a central hole 8. The front inducer wheel 6 is sleeved on the output shaft 22 through the central hole 8. Both the output shaft 22 and the central hole 8 are provided with keyways 9. A flat key 10 is provided in the keyway 9. The output shaft 22 is also provided with a first fixing thread 11. The first fixing thread 11 cooperates with the nut to fix the front inducer wheel 6 on the output shaft 22.

[0020] The output shaft 22 is also provided with a second fixing thread 12 and a fixing sleeve 13. The inner side of the fixing sleeve 13 is provided with an internal thread, which cooperates with the second fixing thread 12 and fixes the impeller 3 on the output shaft 22. The tail of the front inducer 6 abuts against the fixed shaft end away from the impeller 3.

[0021] The extension tube 7 is detachably mounted on the pump body 2 by screws. Combined with the fixing method of the front-mounted inducer wheel 6, the extension tube 7 can be easily removed simply by unscrewing the screws when cleaning or replacing parts inside the pump body 2 is required. This greatly facilitates equipment maintenance and repair.

[0022] A sealing groove 14 is also provided on the inner side of the extension pipe 7, and a sealing ring 15 is provided in the sealing groove 14. The sealing ring 15 abuts against the side end of the water inlet 4, which can effectively prevent liquid from leaking from the connection between the extension pipe 7 and the pump body 2, thus ensuring the sealing and reliability of the pump body 2.

[0023] The extension pipe 7 is also equipped with a connecting water pipe 16 on its side. A clamp 17 is provided on the outside of the connecting water pipe 16 for additional fixation of the connecting water pipe 16. The clamp 17 consists of a main frame 18 and a secondary frame 19. A connecting iron rod 20 is fixedly installed on the main frame 18. A rubber sheet 21 is also provided on the inner side between the secondary frame 19 and the main frame 18. By setting the clamp 17, the connecting water pipe 16 is additionally fixed to prevent it from shaking or shifting under the impact of water flow. It can also reduce the damage to the connection parts caused by vibration and extend the service life of the connecting water pipe 16.

[0024] Of course, the above are just typical examples of this utility model. In addition, this utility model may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by this utility model.

Claims

1. A high-stability anti-cavitation centrifugal pump, comprising a motor (1) and a pump body (2), wherein an impeller (3) is disposed inside the pump body (2), and an output shaft (22) is disposed at the output end of the motor (1), which extends into the pump body (2) and is fixed to the impeller (3), and an inlet (4) and an outlet (5) are disposed on the pump body (2), characterized in that: A front-mounted inducer wheel (6) is provided inside the inlet (4), and the front-mounted inducer wheel (6) is provided on the output shaft (22). An extension pipe (7) is also provided at the outer end of the inlet (4) of the pump body (2), and the front-mounted inducer wheel (6) is provided inside the extension pipe (7). The inner wall of the front guide wheel (6) is provided with a central hole (8). The front guide wheel (6) is sleeved on the output shaft (22) through the central hole (8). Both the output shaft (22) and the central hole (8) are provided with keyways (9). A flat key (10) is arranged in the keyway (9). The output shaft (22) is also provided with a first fixing thread (11). The first fixing thread (11) cooperates with a nut to fix the front guide wheel (6) on the output shaft (22). The output shaft (22) is also provided with a second fixed thread (12), and the output shaft (22) is also provided with a fixed bushing (13). The fixed bushing (13) is provided with an internal thread on its inner side. The internal thread cooperates with the second fixed thread (12) and fixes the impeller (3) on the output shaft (22). The tail of the front inducer (6) abuts against the fixed shaft end away from the impeller (3).

2. The high-stability anti-cavitation centrifugal pump according to claim 1, characterized in that: The extension tube (7) is detachably mounted on the pump body (2) by screws.

3. A high-stability anti-cavitation centrifugal pump according to claim 2, characterized in that: The extension pipe (7) is also provided with a sealing groove (14) inside, and a sealing ring (15) is provided in the sealing groove (14) and the sealing ring (15) abuts against the side end of the water inlet (4).

4. A high-stability anti-cavitation centrifugal pump according to claim 1, characterized in that: The extension pipe (7) is also equipped with a connecting water pipe (16) at its side end. A clamp (17) is provided on the outside of the connecting water pipe (16) for additional fixation of the connecting water pipe (16).

5. A high-stability anti-cavitation centrifugal pump according to claim 4, characterized in that: The hoop (17) consists of a main frame (18) and a secondary frame (19). A connecting iron rod (20) is fixedly installed on the main frame (18), and a rubber sheet (21) is also installed on the inner side between the secondary frame (19) and the main frame (18).

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