Synchronous rotor and impeller combination mechanism of centrifugal water pump

Abstract

The utility model relates to a synchronous rotor and impeller combination mechanism of a centrifugal water pump, the centrifugal water pump comprises a pump shell, a flow guide cavity is arranged at the front end of the pump shell, a centrifugal impeller is arranged at the position, corresponding to a liquid inlet and a liquid outlet, of the flow guide cavity, and the front end of a shaft rod of the centrifugal impeller is fixed in the liquid inlet in a suspended mode. The impeller seat is rotationally connected to the outer side of the shaft rod; the rear end of the impeller seat is fixedly connected with the synchronous rotor through a synchronous connecting mechanism; the synchronous connecting mechanism comprises a first contact disc fixed at the rear end of the impeller seat; a synchronous rotor connecting seat is arranged at the front end of the synchronous rotor, a second contact disc is arranged at the front end of the synchronous rotor connecting seat, and the first contact disc and the second contact disc are circumferentially matched through a jaw structure; a step shaft with the diameter smaller than that of the shaft rod is arranged at the rear end of the shaft rod, a push sleeve is fixed to the tail end of the step shaft, a push bearing is arranged at the end of the push sleeve, and the inner ring of the synchronous rotor connecting base is rotationally connected with the step shaft through the push bearing.

Description

TECHNICAL FIELD

[0001] The utility model relates to a synchronous rotor impeller combination mechanism of centrifugal water pump belongs to synchronous rotor water pump field. BACKGROUND

[0002] For example Figure 1 , the permanent magnet synchronous rotor and the impeller of the centrifugal water pump in the prior art are fixed through a key groove and a push disc, the outer ring of the impeller seat is fixed with the frame of the permanent magnet synchronous rotor through a key groove, and the push disc at the end is fixed through a flange structure and is limited;

[0003] After long-term use, the key groove structure is easy to deform due to the impact of starting and stopping, resulting in a certain amount of frame, and an abnormal sound is generated, and if replacement is required, the impeller seat and the permanent magnet synchronous rotor frame need to be replaced as a whole;

[0004] Moreover, the bolts of the flange structure are also deformed due to the circumferential impact transmitted by the impeller, and are difficult to disassemble, in addition, a certain degree of cracking occurs at the screw hole position, the main reason is that the screw hole is over-drilled to ensure sufficient tension;

[0005] Therefore, it is necessary to improve the structure of the centrifugal water pump to eliminate these problems. INVENTION CONTENTS

[0006] The utility model solves the technical problems that the prior art overcomes, and provides a synchronous rotor impeller combination mechanism of centrifugal water pump.

[0007] The utility model adopts the technical scheme to solve the technical problems:

[0008] A synchronous rotor impeller combination mechanism of centrifugal water pump, the centrifugal water pump includes a pump shell, the front end of the pump shell is provided with a flow guide cavity, the front end of the flow guide cavity is provided with a liquid inlet, the side wall of the flow guide cavity is provided with a liquid outlet, the flow guide cavity is provided with a centrifugal impeller at the positions corresponding to the liquid inlet and the liquid outlet, the shaft rod front end of the centrifugal impeller is suspended and fixed in the liquid inlet, the centrifugal impeller is rotatably connected to the shaft rod, the centrifugal impeller includes an impeller seat, the impeller seat is rotatably connected to the outer side of the shaft rod, and the rear end of the impeller seat is fixedly connected with a synchronous rotor through a synchronous connection mechanism.

[0009] The synchronous connection mechanism includes a first contact disc fixed to the rear end of the impeller seat, a synchronous rotor connecting seat is arranged at the front end of the synchronous rotor, a second contact disc is arranged at the front end of the synchronous rotor connecting seat, and the first contact disc and the second contact disc are circumferentially matched through a toothed structure.

[0010] Wherein, the rear end of the shaft rod is provided with a stepped shaft with a smaller diameter than the shaft rod, the end of the stepped shaft is fixed with a push sleeve, the end of the push sleeve is provided with a push bearing, and the inner ring of the synchronous rotor connecting seat is rotationally connected with the stepped shaft through the push bearing.

[0011] As a further improvement of the utility model, a first inlaid groove is arranged at the rear end of the impeller seat, a first contact disc is fixed in the inlaid groove, a plurality of first positioning grooves are arranged in the side wall of the first inlaid groove in a ring shape, and a first positioning protrusion is arranged on the side wall of the first contact disc in a ring shape and embedded in the first positioning groove.

[0012] The first contact disc is fixed in a split structure, so that the first contact disc can be manufactured from a material different from that of the impeller seat, the cost is optimized, and the service life of the impeller seat is improved.

[0013] As a further improvement of the utility model, a first inlaid groove is arranged at the rear end of the impeller seat, a first contact disc is fixed in the inlaid groove, a plurality of first positioning grooves are arranged in the side wall of the first inlaid groove in a ring shape, and a first positioning protrusion is arranged on the side wall of the first contact disc in a ring shape and embedded in the first positioning groove.

[0014] The push slope can provide radial extrusion from the impeller seat to the first contact disc during rotation, thereby ensuring automatic centering of the first contact disc and improving stability.

[0015] As a further improvement of the utility model, a second inlaid groove is arranged at the front end of the synchronous rotor connecting seat, a second contact disc is fixed in the second inlaid groove, a plurality of second positioning grooves are arranged in the bottom of the second inlaid groove in a ring shape, and a plurality of second positioning protrusions are arranged on the bottom of the second contact disc in a ring shape and embedded in the second positioning grooves.

[0016] In order to distinguish between the two groups of contact discs and to reduce manufacturing difficulty, the second contact disc uses a different fixing form.

[0017] As a further improvement of the utility model, a stepped hole is arranged at the rear end of the impeller seat, and the outer ring of the push bearing is in limiting contact with the stepped end face of the stepped hole.

[0018] The limiting fixation of the stepped hole has higher axial support efficiency than the interference fit fixation.

[0019] As a further improvement of the utility model, the outer ring of the push sleeve is provided with a ring-shaped protruding ring, and the protruding ring is in limiting contact with the inner ring of the push bearing.

[0020] The push-in structure replaces the interference fit by the limiting structure, and improves the axial support efficiency.

[0021] As a further improvement of the utility model, a push nut is threadedly connected to the end of the stepped shaft, and the end of the push nut is in contact with the end of the push-in sleeve through a spring washer.

[0022] The push nut can be conveniently disassembled and reassembled, and can be pre-tightened at any time.

[0023] As a further improvement of the utility model, the toothed structure comprises first protruding teeth arranged in a ring array on the first contact disc and second protruding teeth arranged in a ring array on the second contact disc, the first protruding teeth and the second protruding teeth are both inclined tooth structures, the inclined surfaces of the first protruding teeth and the second protruding teeth are in contact with each other, and the inclined surface of the second protruding teeth is arranged towards the rotation direction of the centrifugal impeller.

[0024] The inclined tooth structure can slide axially during rotation, thereby converting the circumferential driving force into axial friction between the first contact disc and the second contact disc and friction of each structure, and improving the stability of the structure.

[0025] The utility model has the advantages of:

[0026] The utility model improves the strength and service life of the impeller seat by improving the prior art, using a toothed contact structure and a push structure fixed on the rotating shaft to realize fixation, eliminating the arrangement of the array flange bolt holes compared with the prior art, and realizing secondary fastening through axial pre-tightening and correction of the fixed angle compared with the sliding key groove structure, and the toothed contact structure has lower maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0027] The utility model will be further described below in combination with the drawings and examples.

[0028] Figure 1 is a structural schematic view of the prior art;

[0029] Figure 2 is a sectional view of the utility model;

[0030] Figure 3 is an end surface structure schematic view of the synchronous rotor connecting seat;

[0031] Figure 4 is an end surface structure schematic view of the impeller seat;

[0032] Figure 5 is a structural schematic view of the first contact disc;

[0033] Figure 6 is a structural schematic view of the second contact disc;

[0034] Figure 7 This is a rear view of the second contact plate.

[0035] In the diagram: 1. Pump casing; 2. Outlet; 3. Inlet; 4. Connecting plate; 5. Fixing sleeve; 6. Guide cavity; 7. Shaft; 8. Limiting block; 9. Centrifugal impeller; 10. Impeller seat; 11. Synchronous rotor connecting seat; 12. First contact plate; 13. Second contact plate; 14. Stepped hole; 15. Push bearing; 16. Push sleeve; 17. Protruding ring; 18. Spring washer; 19. Push nut; 20. Stepped shaft; 21. Drive rotor; 22. Drive shaft; 23. End housing; 24. Second insert groove; 25. Second positioning groove; 26. First insert groove; 27. First positioning groove; 28. Second positioning protrusion; 29. ​​First positioning protrusion; 30. Second protruding tooth; 31. First protruding tooth. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0037] This utility model is a synchronous rotor-impeller combination mechanism for centrifugal water pumps, which is mainly applicable to water pumps with separate rotor and impeller structures, such as magnetic pumps and electromagnetic pumps.

[0038] This utility model is a synchronous rotor-impeller combination mechanism for centrifugal water pumps, which is mainly applicable to water pumps with separate rotor and impeller structures, such as magnetic pumps and electromagnetic pumps.

[0039] by Figure 1 For example, the water pump includes a pump casing 1. An annular flow guide cavity 6 is provided in the front end housing of the pump casing 1. An inlet 3 is provided at the front end of the front end housing corresponding to the front end of the flow guide cavity 6. An outlet 2 is provided at the side wall of the front end housing corresponding to the flow guide cavity 6. The centrifugal impeller 9 is rotatably connected to the flow guide cavity 6 through a shaft 7. The liquid in the inlet 3 is centrifuged and discharged from the outlet 2.

[0040] A fixing sleeve 5 is fixed inside the liquid inlet 3 by several connecting pieces 4. The front end of the shaft 7 is fixed to the fixing sleeve 5 by interference fit. A limiting block 8 is provided in the middle of the shaft 7. The front end of the centrifugal impeller 9 is axially limited by the limiting block 8. The centrifugal impeller 9 includes an impeller seat 10, and the impeller seat 10 is rotatably connected to the shaft 7 by a bearing.

[0041] An annular impeller connecting platform is provided at the tail of the impeller seat 10. A synchronous rotor is connected to the rear end of the impeller seat 10 through the impeller connecting platform. The synchronous rotor includes a synchronous rotor connecting seat 11. The front end of the synchronous rotor connecting seat 11 is connected to the impeller connecting platform through a synchronous connection mechanism. In order to reduce the radial load of the shaft 7, the synchronous rotor connecting seat 11 is rotatably connected to the end of the shaft 7.

[0042] The synchronous connection mechanism includes a first contact plate 12 fixed to the rear end of the impeller seat 10 and a second contact plate 13 fixed to the front end of the synchronous rotor connecting seat 11. The first contact plate 12 and the second contact plate 13 are circumferentially engaged by a jaw clamp structure. Figure 5 and Figure 6 The toothed structure includes a first protruding tooth 31 arranged in a ring array on the first contact disk 12 and a second protruding tooth 30 arranged in a ring array on the second contact disk 13. Both the first protruding tooth 31 and the second protruding tooth 30 are helical tooth structures. The inclined surfaces of the first protruding tooth 31 and the second protruding tooth 30 are in contact with each other. The inclined surface of the second protruding tooth 30 is arranged in the direction of rotation of the centrifugal impeller 9.

[0043] like Figure 4 and Figure 5 An annular first inlay groove 26 is provided at the rear end of the impeller seat 10. The first contact plate 12 is fixed in the inlay groove. A plurality of first positioning grooves 27 are arranged in annular array on the inner and outer walls of the first inlay groove 26. A first positioning protrusion 29 embedded in the first positioning groove 27 is arranged in annular array on the inner and outer walls of the first contact plate 12. A pushing inclined surface is provided in the first inlay groove 26 facing the impeller rotation direction. A contact inclined surface that contacts the pushing inclined surface is provided in the first positioning protrusion 29 facing the impeller rotation direction. Figure 3 and Figure 7 A second inlay groove 24 is provided at the front end of the synchronous rotor connecting seat 11. The second contact plate 13 is fixed in the second inlay groove 24. A number of second positioning grooves 25 are arranged in an annular array at the bottom of the second inlay groove 24. A number of second positioning protrusions 28 embedded in the second positioning grooves 25 are arranged in an annular array at the bottom of the second contact plate 13.

[0044] A stepped hole 14 is provided at the rear end of the impeller seat 10, and the axial end of the outer ring of the push bearing 15 is in limiting contact with the stepped end face of the stepped hole 14; a stepped shaft 20 with a diameter smaller than that of the shaft 7 is provided at the rear end of the shaft 7, and a push sleeve 16 is fixed at the end of the stepped shaft 20. A push nut 19 is threadedly connected to the end of the stepped shaft 20, and the end of the push nut 19 is in contact with the end of the push sleeve 16 through a spring washer 18; a push bearing 15 is provided at the end of the push sleeve 16, and an annular protruding ring 17 is provided on the outer ring of the push sleeve 16, which is in limiting contact with the inner ring of the push bearing 15; the inner ring of the synchronous rotor connecting seat 11 is rotatably connected to the stepped shaft 20 through the push bearing 15.

[0045] An end housing 23 is provided at the rear end of the pump housing 1. The end housing 23 is sealed and isolated from the front housing through a dividing sleeve. A drive rotor 21 is rotatably connected inside the end housing 23 through a drive shaft 22. A drive permanent magnet is provided on the drive rotor 21. When the drive rotor 21 rotates, it drives the synchronous rotor to rotate synchronously through the drive permanent magnet, and then drives the centrifugal impeller 9 to rotate through the interlocking of the toothed structure.

[0046] Furthermore, during rotation, the second contact disc 13 on the synchronous rotor connecting seat 11 and the first contact disc 12 are pushed together by the helical tooth structure, causing the second positioning protrusion 28 at the rear end of the second contact disc 13 to press into the second positioning groove 25, thereby increasing the bonding strength of the second contact disc 13. Moreover, the mutual pushing of the helical teeth will pre-tighten the rear spring washer 18 to push the nut 19, thereby improving structural stability. At the same time, during the synchronous rotor drive, the sliding of the contact inclined surface will also cause the first contact disc 12 to automatically center itself at the center of the first positioning groove 27 array, ensuring stability and reducing rotational vibration caused by center of gravity shift.

[0047] The technical solution of this utility model eliminates the following: Figure 1 The technical problem of low strength caused by the bolt array fixing method is eliminated by the independent replacement of the first contact plate 12 and the second contact plate 13 structure. The technical problems of low stability and high replacement cost of the transmission connection mechanism are eliminated.

[0048] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A synchronous rotor-impeller coupling mechanism for a centrifugal water pump, the centrifugal water pump including a pump casing (1), a guide cavity (6) provided at the front end of the pump casing (1), an inlet (3) provided at the front end of the guide cavity (6), an outlet (2) provided on the side wall of the guide cavity (6), a centrifugal impeller (9) provided at the position corresponding to the inlet (3) and the outlet (2) of the guide cavity (6), the centrifugal impeller (9) being suspended and fixed at the front end of the shaft (7) of the centrifugal impeller (9) within the inlet (3), and the centrifugal impeller (9) being rotatably connected to the shaft (7), characterized in that: The centrifugal impeller (9) includes an impeller seat (10), which is rotatably connected to the outside of the shaft (7). The rear end of the impeller seat (10) is fixedly connected to the synchronous rotor through a synchronous connection mechanism. Among them, the synchronous connection mechanism includes a first contact plate (12) fixed to the rear end of the impeller seat (10); a synchronous rotor connecting seat (11) is provided at the front end of the synchronous rotor, and a second contact plate (13) is provided at the front end of the synchronous rotor connecting seat (11); the first contact plate (12) and the second contact plate (13) are circumferentially engaged by a toothed structure. Among them, a stepped shaft (20) with a diameter smaller than that of the shaft (7) is provided at the rear end of the shaft (7). A push sleeve (16) is fixed at the end of the stepped shaft (20). A push bearing (15) is provided at the end of the push sleeve (16). The inner ring of the synchronous rotor connecting seat (11) is rotatably connected to the stepped shaft (20) through the push bearing (15).

2. The synchronous rotor-impeller coupling mechanism of a centrifugal water pump as described in claim 1, characterized in that: An annular first inlay groove (26) is provided at the rear end of the impeller seat (10), and the first contact plate (12) is fixed in the inlay groove. Several first positioning grooves (27) are arranged in an annular array on the side wall of the first inlay groove (26), and first positioning protrusions (29) embedded in the first positioning grooves (27) are arranged in an annular array on the side wall of the first contact plate (12).

3. The synchronous rotor-impeller coupling mechanism of a centrifugal water pump as described in claim 2, characterized in that: The first inlay groove (26) is provided with a pushing slope in the direction of impeller rotation, and the first positioning protrusion (29) is provided with a contact slope that contacts the pushing slope in the direction of impeller rotation.

4. The synchronous rotor-impeller coupling mechanism of a centrifugal water pump as described in claim 1, characterized in that: in The front end of the synchronous rotor connector (11) is provided with a second inlay groove (24), the second contact plate (13) is fixed in the second inlay groove (24), the bottom of the second inlay groove (24) is provided with a number of second positioning grooves (25) in an annular array, and the bottom of the second contact plate (13) is provided with a number of second positioning protrusions (28) embedded in the second positioning groove (25) in an annular array.

5. The synchronous rotor-impeller coupling mechanism of a centrifugal water pump as described in claim 1, characterized in that: A stepped hole (14) is provided at the rear end of the impeller seat (10), and the axial end of the outer ring of the drive bearing (15) is in contact with the stepped end face of the stepped hole (14).

6. The synchronous rotor-impeller coupling mechanism of a centrifugal water pump as described in claim 1, characterized in that: The outer ring of the push sleeve (16) is provided with an annular protrusion ring (17), which makes contact with the inner ring of the push bearing (15).

7. The synchronous rotor-impeller coupling mechanism of a centrifugal water pump as described in claim 2, characterized in that: At the end of the stepped shaft (20), there is a push nut (19) connected by a thread, and the end of the push nut (19) contacts the end of the push sleeve (16) through a spring washer (18).

8. The synchronous rotor-impeller coupling mechanism of a centrifugal water pump as described in claim 1, characterized in that: The toothed structure includes a first protruding tooth (31) arranged in an annular array on the first contact disk (12) and a second protruding tooth (30) arranged in an annular array on the second contact disk (13). Both the first protruding tooth (31) and the second protruding tooth (30) are helical tooth structures. The inclined surfaces of the first protruding tooth (31) and the second protruding tooth (30) are in contact with each other. The inclined surface of the second protruding tooth (30) is arranged in the direction of rotation of the centrifugal impeller (9).

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