CN216157918U - Double-impeller magnetic pump - Google Patents

Abstract

The utility model relates to a double-impeller magnetic pump which comprises a pump cavity mechanism, a front magnetic transmission mechanism, an isolation sleeve and a rear magnetic transmission mechanism, wherein the pump cavity mechanism is arranged on the front side of the pump cavity mechanism; the pump cavity mechanism comprises a front pump cover, a pump body, a rear pump cover, a primary impeller and a secondary impeller, wherein the front pump cover, the pump body and the rear pump cover are mutually encircled to form a pump cavity; the front magnetic transmission mechanism comprises a pump shaft, a front bearing assembly and an inner magnetic rotor, the rear side of the front pump cover is recessed forwards to form an impeller balance cavity, and the back side of the secondary impeller penetrates through a balance hole which is provided with a plurality of impeller ports for communicating the impeller balance cavity with the primary impeller around the center. Compared with the prior art, the two impellers are oppositely arranged, so that the problem of axial force unbalance of the pump caused by asymmetry of the front cover plate and the rear cover plate of a single impeller is mutually balanced; meanwhile, a plurality of balance holes are formed in the center of the secondary impeller so as to communicate the low-pressure area on the back side of the impeller with the center of the impeller, thereby further solving the problem of residual axial force, minimizing the axial force of the pump and prolonging the service life of the pump.

Description

Double-impeller magnetic pump

Technical Field

The utility model belongs to the technical field of magnetic pumps, and relates to a double-impeller magnetic pump.

Background

The oil pump is used as a machine for conveying oil, plays a very important role, and has relatively strict requirements on the pump because oil materials are flammable and explosive. However, most of the oil pumps on the market are centrifugal pumps of packing seal or mechanical seal type, and during the long-term operation of the oil pumps, the packing seal or the mechanical seal always frequently leaks, so that the requirements of environmental protection and safety cannot be met. And when some high-temperature oil is conveyed, auxiliary devices are usually required to be added for cooling and flushing the filler or the mechanical seal, so that the pump is complex in structure, is overstaffed, and is relatively troublesome to use and maintain. The magnetic centrifugal pump has no leakage, and is widely applied to conveying various flammable, explosive, toxic, harmful, precious and other liquid media. The general magnetic pump delivery lift is lower, can't use under high-lift operating mode to the axial force balance of magnetic pump also is difficult to realize, leads to magnetic pump thrust bearing and slide bearing to appear wearing and tearing, and the life-span of magnetic pump is corresponding also to reduce a lot.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving the above problems and providing a dual impeller magnetic pump.

The purpose of the utility model can be realized by the following technical scheme:

a double-impeller magnetic pump comprises

The pump cavity mechanism comprises a front pump cover, a pump body and a rear pump cover which are arranged in parallel in sequence and mutually surround to form a pump cavity, and a primary impeller and a secondary impeller which are arranged in parallel in the pump cavity and have impeller openings opposite to each other;

the front magnetic transmission mechanism comprises a pump shaft, a front bearing assembly and an inner magnetic rotor, wherein the front bearing assembly is fixedly arranged on the rear pump cover, one end of the pump shaft is embedded in the first-stage impeller and the second-stage impeller, the other end of the pump shaft penetrates through the front bearing assembly and extends out, and the inner magnetic rotor is arranged on the extending end; the back side of the front pump cover is recessed forwards to form an impeller balance cavity, the back side of the secondary impeller is provided with a plurality of balance holes around the center in a penetrating way, and the impeller balance cavity is communicated with an impeller opening of the primary impeller through the balance holes;

the outer edge of the isolating sleeve is connected to the outer side of the rear pump cover in a sealing mode and forms a front bearing cooling space in a surrounding mode with the rear pump cover, and the inner magnetic rotor and the front bearing assembly are arranged in the front bearing cooling space;

the rear magnetic transmission mechanism comprises a connecting frame and a bearing box which are sequentially connected with the rear pump cover, a rear bearing assembly arranged in the bearing box, an outer magnetic rotor arranged opposite to the inner magnetic rotor, a transmission shaft with one end in transmission connection with the outer magnetic rotor and the other end penetrating through the rear bearing assembly and extending out, and a driving element in transmission connection with the transmission shaft.

Furthermore, a pump cover bearing and grinding ring is arranged on the side wall of the impeller balance cavity, and an impeller back bearing and grinding ring in sliding contact with the pump cover bearing and grinding ring is arranged on the back side of the primary impeller;

a flow passage structure for communicating the primary impeller port and the secondary impeller port is arranged in the pump body;

the runner structure be equipped with respectively with one-level impeller mouthful one-level pump body that grinds ring sliding contact with one-level impeller mouthful to and the second grade pump body that grinds ring sliding contact with second grade impeller mouthful one-level impeller mouthful outer fringe on be equipped with one-level impeller mouthful one-level pump body that grinds the ring sliding contact with the second grade impeller mouthful one-level pump body that grinds the ring.

Furthermore, a pump shaft abdicating hole is further formed in the flow channel structure, an interstage bushing is embedded in the pump shaft abdicating hole, an interstage shaft sleeve in sliding contact with the interstage bushing is sleeved on the pump shaft, and two ends of the interstage shaft sleeve are respectively abutted to the first-stage impeller and the second-stage impeller.

Furthermore, a circulating liquid inlet hole and a circulating liquid outlet hole which are communicated between the pump cavity and the front bearing cooling space are formed in the rear pump cover in a penetrating mode;

the circulation feed liquor hole one end set up with one-level impeller outer fringe is relative, the circulation one end and the dorsal part center of one-level impeller set up relatively of going out the liquid hole.

Furthermore, the rear pump cover axially protrudes backwards along the pump shaft to form a front bearing seat, and the front bearing assembly is arranged on the front bearing seat.

Furthermore, the front bearing assembly comprises a pair of front sliding bearings arranged on the front bearing seat in parallel, and a front bearing sleeve which is in sliding contact with the front sliding bearings and sleeved on the pump shaft;

the front sliding bearing is a pressureless sintering silicon carbide bearing, and the front bearing sleeve is a pressureless sintering silicon carbide bearing sleeve.

Furthermore, a bearing sleeve retaining sleeve is arranged between the pair of front bearing sleeves, and a gap is arranged between the pair of front sliding bearings;

and a bearing cooling hole for communicating the gap with the front bearing cooling space is formed in the front bearing seat in a penetrating manner.

Furthermore, pump cover sealing gaskets are arranged between the front pump cover and the pump body and between the rear pump cover and the pump body;

an isolation sleeve sealing gasket is arranged between the outer edge of the isolation sleeve and the rear pump cover, and the outer edge of the isolation sleeve is clamped and fixed between the connecting frame and the rear pump cover.

Furthermore, the rear pump cover, the connecting frame, the bearing box and the isolating sleeve are sequentially surrounded to form a rear bearing cooling space;

and a water injection cooling port and a water outlet cooling port are formed in the side wall of the bearing box in a penetrating manner.

Furthermore, the rear bearing assembly comprises a plurality of rolling bearings which are arranged in the bearing box and sleeved on the transmission shaft in parallel.

Compared with the prior art, the utility model has the following characteristics:

1) the utility model adopts a magnetic transmission connecting structure, realizes full sealing without leakage under the condition of ensuring better transmission efficiency, avoids the problem of environmental pollution caused by outflow of polluting media, and can be widely applied to the conveying tasks of toxic and harmful, flammable and explosive media and the like;

2) the pump shaft adopts a double-bearing supporting structure consisting of the interstage bush, the interstage shaft sleeve, the front sliding bearing and the front bearing sleeve, and the interstage bush and the interstage shaft sleeve are arranged between the double impellers, so that the rotation stability of the double impellers is ensured;

3) according to the utility model, the circulating liquid inlet hole and the circulating liquid outlet hole are formed in the rear pump cover, the cooling space of the front bearing is communicated with the high-pressure area at the outer edge of the impeller in the pump cavity and the low-pressure area at the back side of the impeller, so that the circulating communication between the pump cavity and the isolation sleeve is realized, and the components such as the pump shaft, the front bearing assembly, the inner magnetic rotor and the like are lubricated or cooled through the introduced conveying medium, so that the problem of device damage caused by high temperature or hard grinding is avoided;

4) the double-impeller structure is adopted, so that the outlet pressure of the pump can be obviously improved, and the magnetic pump can be suitable for the working condition with high lift;

5) the two impellers are oppositely arranged, so that the problem of axial force unbalance of the pump caused by asymmetry of the front cover plate and the rear cover plate of a single impeller is mutually balanced; meanwhile, a plurality of balance holes are formed in the center of the secondary impeller, and a dynamic sealing structure is formed between the pump cover bearing and grinding ring and the impeller back side bearing and grinding ring, so that a low pressure area on the back side of the impeller is communicated with the center of the impeller, the residual axial force is further solved, the axial force of the pump is reduced to the minimum, and the service life of the pump is prolonged;

6) the structure is used for avoiding the problem that the impeller is in friction with a pump body or a pump cover due to fluid disturbance, so that the service life of the impeller is short, and only the lower-price wear ring needs to be replaced when the impeller is worn, so that the whole impeller does not need to be replaced, and the later maintenance cost can be reduced; on the other hand, the pump shaft can also play a certain auxiliary supporting role, so that the pump shaft is prevented from being twisted;

7) the utility model adopts the bearing box and the rear bearing assembly to jointly form a transmission shaft supporting structure so as to ensure the stable work of the transmission shaft and the outer magnetic rotor and further ensure the magnetic transmission efficiency;

8) according to the utility model, the water injection cooling port and the water outlet cooling port are formed in the bearing box, so that a sufficient cooling effect is exerted on the rear bearing assembly and the outer magnetic rotor in the rear bearing cooling space, and the stable operation of the rear bearing assembly and the outer magnetic rotor is ensured.

Drawings

FIG. 1 is a schematic structural diagram of a dual impeller magnetic pump including a pump chamber mechanism according to an embodiment;

the notation in the figure is:

1-front pump cover, 2-impeller nut, 3-second-stage impeller, 4-impeller back-side bearing and grinding ring, 5-pump cover bearing and grinding ring, 6-front pump cover sealing gasket, 7-pump body, 8-second-stage impeller mouth bearing and grinding ring, 9-second-stage pump body bearing and grinding ring, 10-first-stage impeller mouth bearing and grinding ring, 11-first-stage pump body bearing and grinding ring, 12-interstage bush, 13-interstage shaft sleeve, 14-first-stage impeller, 15-rear pump cover sealing gasket, 16-rear pump cover, 17-spacer bush sealing gasket, 18-thrust bearing, 19-front bearing bush, 20-front sliding bearing, 21-bearing bush retaining sleeve, 22-inner magnetic rotor, 23-pump shaft, 24-spacer bush, 25-outer magnetic rotor, 26-coupling frame, 27-bearing box, 28-transmission shaft, 29-rolling bearing, 30-water outlet cooling port, 31-water injection cooling port, 32-balance hole, 101-circulating liquid inlet hole and 102-circulating liquid outlet hole.

Detailed Description

The utility model is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

Example (b):

a dual impeller magnetic pump as shown in fig. 1 comprises a pump chamber mechanism, a front magnetic transmission mechanism, a spacer sleeve 24 and a rear magnetic transmission mechanism. The pump cavity mechanism comprises a front pump cover 1, a pump body 7, a rear pump cover 16, a first-stage impeller 14 and a second-stage impeller 3, wherein the front pump cover 1, the pump body 7 and the rear pump cover 16 are sequentially arranged in parallel and mutually surround to form a pump cavity, and the first-stage impeller 14 and the second-stage impeller 3 are arranged in the pump cavity in parallel and have impeller openings opposite to each other. The front magnetic transmission mechanism comprises a pump shaft 23, a front bearing assembly fixedly arranged on the rear pump cover 16 and an inner magnetic rotor 22, one end of the pump shaft 23 is embedded in the first-stage impeller 14 and the second-stage impeller 3, the other end of the pump shaft passes through the front bearing assembly and extends out, and the inner magnetic rotor 22 is arranged on the extending end; the rear pump cover 16 projects axially rearward along the pump shaft 23 to form a front bearing block on which the front bearing assembly is mounted. The rear side of the front pump cover 1 is recessed forwards to form an impeller balance cavity, the back side of the secondary impeller 3 is penetrated around the center and provided with a plurality of balance holes 32, and the impeller balance cavity is communicated with an impeller opening of the primary impeller 14 through the balance holes 32. The outer edge of the isolation sleeve 24 is connected to the outer side of the rear pump cover 16 in a sealing manner, and surrounds the rear pump cover 16 to form a front bearing cooling space, and the inner magnetic rotor 22 and the front bearing assembly are arranged in the front bearing cooling space. The rear magnetic transmission mechanism comprises a connecting frame 26 and a bearing box 27 which are sequentially connected with the rear pump cover 16, a rear bearing assembly arranged in the bearing box 27, an outer magnetic rotor 25 arranged opposite to the inner magnetic rotor 22, a transmission shaft 28 with one end in transmission connection with the outer magnetic rotor 25 and the other end penetrating through the rear bearing assembly and extending out, and a driving element in transmission connection with the transmission shaft 28, wherein the driving element is a driving motor.

In order to avoid the friction collision between the impeller and the inner wall of the pump body 7, a pump cover grinding ring 5 is arranged on the side wall of the impeller balance cavity, and an impeller back grinding ring 4 in sliding contact with the pump cover grinding ring 5 is arranged on the back side of the primary impeller 14. Similarly, a flow channel structure for communicating the impeller opening of the first-stage impeller 14 and the impeller opening of the second-stage impeller 3 is arranged in the pump body 7, a first-stage impeller opening grinding ring 10 is arranged on the outer edge of the impeller opening of the first-stage impeller 14, a second-stage impeller opening grinding ring 8 is arranged on the outer edge of the impeller opening of the second-stage impeller 3, and a first-stage pump body grinding ring 11 in sliding contact with the first-stage impeller opening grinding ring 10 and a second-stage pump body grinding ring 9 in sliding contact with the second-stage impeller opening grinding ring 8 are respectively arranged on the flow channel structure. Meanwhile, the arrangement of the wear-bearing ring also plays a certain supporting role in the rotation of the impeller.

In order to further ensure the rotation stability of the impeller, a pump shaft abdicating hole is also formed in the flow channel structure, an interstage bush 12 is embedded in the pump shaft abdicating hole, an interstage shaft sleeve 13 in sliding contact with the interstage bush 12 is sleeved on the pump shaft 23, two ends of the interstage shaft sleeve 13 are respectively abutted against the first-stage impeller 14 and the second-stage impeller 3, namely, a support bearing is arranged between the two impellers, and the support bearing is matched with a front bearing assembly to achieve a good rotation support effect on the pump shaft. The front bearing assembly includes a pair of front sliding bearings 20 juxtaposed on the front bearing seat, and a front bearing sleeve 19 slidably contacting the front sliding bearings 20 and sleeved on the pump shaft 23. And the front sliding bearing 20 and the front bearing sleeve 19 are both made of pressureless sintered silicon carbide materials with better wear resistance and corrosion resistance. In addition, a thrust bearing 18 is further provided between the front sliding bearing 20 positioned on the front side and the first-stage impeller 14, an impeller nut 2 is further provided on a pump shaft 23 sleeved on the front side of the second-stage impeller 3, and the second-stage impeller 3, the interstage bush 12, the first-stage impeller 14, the thrust bearing 18 and the front bearing assembly are sequentially abutted and arranged through the impeller nut 2 so as to avoid axial displacement of the impeller.

In order to avoid the problem of overheating of the front bearing assembly and the inner magnetic rotor 22, the rear pump cover 16 of the present embodiment is provided with a circulating liquid inlet hole 101 and a circulating liquid outlet hole 102 which are communicated between the pump cavity and the front bearing cooling space; and one end of the circulating liquid inlet hole 101 is arranged opposite to the outer edge of the first-stage impeller 14, and one end of the circulating liquid outlet hole 102 is arranged opposite to the back side of the first-stage impeller 14.

Further, a bearing bush retaining bush 21 is provided between the pair of front bearing bushes 19, and a gap is provided between the pair of front sliding bearings 20; in order to further enhance the cooling effect on the front bearing assembly, a bearing cooling hole communicating the gap with the front bearing cooling space is formed through the front bearing seat, so as to guide the conveying medium between the front sliding bearing 20 and the front bearing sleeve 19.

In order to ensure the sealing performance in the pump and avoid the leakage of the conveying medium, a front pump cover sealing gasket 6 is arranged between the front pump cover 1 and the pump body 7, and a rear pump cover sealing gasket 15 is arranged between the rear pump cover 16 and the pump body 7; an isolation sleeve sealing gasket 17 is arranged between the outer edge of the isolation sleeve 24 and the rear pump cover 16, and the outer edge of the isolation sleeve 24 is clamped and fixed between the connecting frame 26 and the rear pump cover 16 so as to improve the sealing effect of the isolation sleeve sealing gasket 17.

The rear bearing assembly is used for rotatably supporting the transmission shaft 28, and specifically includes 3 rolling bearings 29 disposed in the bearing housing 27 and sleeved on the transmission shaft 28 in parallel. The rear pump cover 16, the connecting frame 26, the bearing box 27 and the isolating sleeve 24 are sequentially surrounded to form a rear bearing cooling space; the side wall of the bearing box 27 is provided with a water injection cooling port 31 and a water outlet cooling port 30 in a penetrating way so as to be convenient for introducing circulating cooling water, thereby playing a good cooling and lubricating role for the external magnetic rotor 25 and the rear bearing assembly.

The embodiments described above are intended to facilitate the understanding and use of the utility model by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims (10)

1. A double-impeller magnetic pump is characterized by comprising

The pump cavity mechanism comprises a front pump cover (1), a pump body (7) and a rear pump cover (16) which are arranged in parallel in sequence and mutually surround to form a pump cavity, and a primary impeller (14) and a secondary impeller (3) which are arranged in parallel in the pump cavity and have opposite impeller openings;

the front magnetic transmission mechanism comprises a pump shaft (23), a front bearing assembly fixedly arranged on the rear pump cover (16) and an inner magnetic rotor (22), wherein one end of the pump shaft (23) is embedded in the first-stage impeller (14) and the second-stage impeller (3), the other end of the pump shaft penetrates through the front bearing assembly and extends out, and the inner magnetic rotor (22) is arranged on the extending end; the rear side of the front pump cover (1) is recessed forwards to form an impeller balance cavity, the back side of the secondary impeller (3) is provided with a plurality of balance holes (32) in a penetrating way around the center, and the impeller balance cavity is communicated with an impeller opening of the primary impeller (14) through the balance holes (32);

the outer edge of the isolating sleeve (24) is connected to the outer side of the rear pump cover (16) in a sealing mode and surrounds the rear pump cover (16) to form a front bearing cooling space, and the inner magnetic rotor (22) and the front bearing assembly are arranged in the front bearing cooling space;

the rear magnetic transmission mechanism comprises a connecting frame (26) and a bearing box (27) which are sequentially connected with the rear pump cover (16), a rear bearing assembly arranged in the bearing box (27), an outer magnetic rotor (25) which is opposite to the inner magnetic rotor (22), a transmission shaft (28) with one end in transmission connection with the outer magnetic rotor (25) and the other end penetrating through the rear bearing assembly and extending out, and a driving element in transmission connection with the transmission shaft (28).

2. The double-impeller magnetic pump according to claim 1, characterized in that the side wall of the impeller balance cavity is provided with a pump cover wear ring (5), and the back side of the primary impeller (14) is provided with an impeller back side wear ring (4) in sliding contact with the pump cover wear ring (5);

a flow channel structure for communicating an impeller port of the primary impeller (14) with an impeller port of the secondary impeller (3) is arranged in the pump body (7);

one-level impeller (14) impeller mouthful outer fringe on be equipped with one-level impeller mouthful and hold grinding ring (10), second stage impeller (3) impeller mouthful outer fringe on be equipped with second stage impeller mouthful and hold grinding ring (8), the runner structurally be equipped with respectively with one-level impeller mouthful one-level pump body that grinds ring (10) sliding contact and hold grinding ring (11) to and with second stage impeller mouthful second pump body that grinds ring (8) sliding contact and hold grinding ring (9).

3. The twin-impeller magnetic pump according to claim 2, wherein the flow channel structure is further provided with a pump shaft relief hole, an interstage bushing (12) is embedded in the pump shaft relief hole, the pump shaft (23) is sleeved with an interstage shaft sleeve (13) in sliding contact with the interstage bushing (12), and two ends of the interstage shaft sleeve (13) are respectively abutted against the primary impeller (14) and the secondary impeller (3).

4. The double-impeller magnetic pump as claimed in claim 1, wherein the rear pump cover (16) is provided with a circulating liquid inlet hole (101) and a circulating liquid outlet hole (102) which are communicated between the pump cavity and the front bearing cooling space in a penetrating manner;

circulation feed liquor hole (101) one end and one-level impeller (14) outer fringe set up relatively, circulation play liquid hole (102) one end and one-level impeller (14) dorsal part set up relatively.

5. A twin impeller magnetic pump as defined in claim 4 in which the rear pump cover (16) projects axially rearwardly of the pump shaft (23) to form a front bearing block on which the front bearing assembly is mounted.

6. A twin-impeller magnetic pump according to claim 5, characterised in that the front bearing assembly comprises a pair of front sliding bearings (20) juxtaposed on the front bearing block, and a front bearing bush (19) in sliding contact with the front sliding bearings (20) and fitted over the pump shaft (23);

the front sliding bearing (20) is a pressureless sintering silicon carbide bearing, and the front bearing sleeve (19) is a pressureless sintering silicon carbide bearing sleeve.

7. A twin-impeller magnetic pump according to claim 6 characterised in that a bearing bush spacer (21) is provided between a pair of front bearing bushes (19) and a gap is provided between a pair of front sliding bearings (20);

and a bearing cooling hole for communicating the gap with the front bearing cooling space is formed in the front bearing seat in a penetrating manner.

8. The double-impeller magnetic pump according to claim 1, characterized in that pump cover gaskets are arranged between the front pump cover (1) and the pump body (7) and between the rear pump cover (16) and the pump body (7);

an isolation sleeve sealing gasket (17) is arranged between the outer edge of the isolation sleeve (24) and the rear pump cover (16), and the outer edge of the isolation sleeve (24) is clamped and fixed between the connecting frame (26) and the rear pump cover (16).

9. The double-impeller magnetic pump as claimed in claim 1, characterized in that the rear pump cover (16), the coupling frame (26), the bearing box (27) and the spacer bush (24) surround in sequence to form a rear bearing cooling space;

and a water injection cooling port (31) and a water outlet cooling port (30) are formed in the side wall of the bearing box (27) in a penetrating manner.

10. A twin-impeller magnetic pump as claimed in claim 9, characterised in that the rear bearing assembly comprises a plurality of rolling bearings (29) disposed within a bearing housing (27) and nested side-by-side on the drive shaft (28).

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