CN216477868U - Sectional type multistage centrifugal pump without balancing device - Google Patents

Abstract

The utility model discloses a sectional type multistage centrifugal pump without a balancing device, which comprises a shell and a rotating shaft, wherein the rotating shaft is arranged in the shell; the shell comprises a front bearing body, a water inlet section, a middle section, a water outlet section and a rear bearing body, and the outer side of the rotating shaft is connected with an impeller; the impeller front to seal ring clearance area S1 and the impeller rear to vane clearance area S2 are equal. Compared with the prior art, the utility model has the advantages that: (1) a balance device is cancelled, easily damaged parts are reduced, maintenance cost is reduced, and the overhaul time of the pump body is delayed; (2) a return pipe is cancelled, no flow flows back, the consumed shaft power is the same, and the discharge flow is increased; (3) the rotor part does not move, the service life of the bearing is prolonged, and the safety and the reliability are improved; (4) the front bearing body and the rear bearing body are lubricated by thin oil; (5) each impeller, the middle section, the sealing ring, the guide vane and the guide vane sleeve form a self-balancing device, and almost no axial force is generated.

Description

Sectional type multistage centrifugal pump without balancing device

Technical Field

The utility model relates to the technical field of centrifugal pumps, in particular to a sectional type multistage centrifugal pump without a balancing device.

Background

Since the existence of the sectional type multistage centrifugal pump, most of the sectional type multistage centrifugal pumps balance axial force by adopting a balance device of a balance disc, and a lot of manufacturers carry out a lot of experimental researches on the vital parts of the sectional type multistage centrifugal pump, but the basic structure of the sectional type multistage centrifugal pump is not changed, and the axial force is balanced by pressure drop generated by leakage. The impellers of the sectional multistage pump are all closed centrifugal impellers, the front cover plate and the rear cover plate of the impeller are asymmetric, and the front cover plate is not provided with a cover plate at the liquid suction port. On the other hand, the impeller rotates, the front cover plate and the rear cover plate drive liquid in the front cavity and the rear cavity to rotate, and the liquid pressure in the side cavity of the cover plate is released according to the parabolic rule. The pressure acting on the rear cover plate is balanced with the pressure symmetrically acting on the front cover plate by the upper part of the port ring, and the axial force generated by subtracting the residual pressure after the pressure of the sucked liquid from the lower part of the port ring is directed to the inlet of the impeller. The axial forces generated by the semi-open impeller and the open impeller are greater.

In the traditional sectional type multistage centrifugal pump, the leakage rate of the balance disc is large, the general leakage rate is 4% -15% of the rated flow rate of the pump, and the leakage rate is larger and the energy consumption is more as the number of stages of the sectional type multistage pump is more.

And in addition, the balance disc device has large clearance for leakage, impurities can easily enter, the abrasion is fast, after the balance disc device is abraded, the rotor part can move towards the motor end, and an inner impeller and the middle section are abraded seriously, so that the whole pump is scrapped.

Axial force is balanced through the balance disc device, in the processes of starting, running and stopping, axial movement and floating of the rotor part exist, when the mechanical seal is matched with the sealing part, the spring is easy to lose efficacy, the use occasion of the sectional type multistage centrifugal pump is limited, and potential safety hazards exist in the use of special occasions.

The technical problems reflected above are therefore a problem to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a sectional type multistage centrifugal pump without a balancing device.

In order to realize the purpose, the following technical scheme is adopted: a segment type multistage centrifugal pump without a balancing device comprises a shell and a rotating shaft, wherein the rotating shaft is arranged in the shell;

the shell comprises a front bearing body, a water inlet section, a middle section, a water outlet section and a rear bearing body, wherein an impeller is connected to the outer side of the rotating shaft, the impeller and the middle section are matched to rotate, a guide vane is arranged on the rear side of the impeller, guide vane sleeves are arranged on the guide vane and the rear side of the impeller, a sealing ring is arranged between the front side and the middle section of the impeller, and four thread grooves are formed in the rear side of the impeller;

the impeller front side and seal ring clearance area S1 and the impeller rear side and guide vane clearance area S2 are equal;

an angular contact bearing is arranged between the rear bearing body and the rotating shaft, a front adjusting bolt and a rear adjusting bolt are arranged in the rear bearing body, and the front adjusting bolt, the rear adjusting bolt and the rotating shaft form a limiting mechanism.

As an improvement, the impeller, the sealing ring, the guide vane and the guide vane sleeve are respectively provided with a matched sealing part.

As an improvement, a balance hole is formed in the front side of the guide vane sleeve, and two ends of the balance hole penetrate through the rear side of the impeller.

As an improvement, the front bearing body and the rear bearing body are lubricated by lubricating oil.

Compared with the prior art, the utility model has the advantages that:

(1) a balancing device is cancelled, wearing parts are reduced, maintenance cost is reduced, and overhaul time of the pump body is delayed;

(2) the back flow has been cancelled, does not have the flow backward flow, compares with the traditional festival segmentation multistage pump of the same model: the consumed shaft power is the same, and the discharged flow of the novel sectional type multi-stage pump is increased by 3-10 percent;

(3) the rotor part does not move, the service life of the bearing is prolonged, and the safety and the reliability are improved;

(4) the front bearing body and the rear bearing body are lubricated by thin oil, so that the heat dissipation is good, the oil position can be visualized, the oil can be added at any time, and the bearing can be maintained better;

(5) each impeller, the middle section, the sealing ring, the guide vane and the guide vane sleeve form a self-balancing device, and almost no axial force is generated.

Drawings

FIG. 1 is a block diagram of the present invention.

Fig. 2 is an impeller axial force balance portion and force diagram of the present invention.

Fig. 3 is a rear seal face view of the impeller of the present invention.

Fig. 4 is a partial enlarged view of X of the present invention.

As shown in the figure: 1. the device comprises a shell, 2, a rotating shaft, 3, a front bearing body, 4, a water inlet section, 5, a middle section, 6, a water outlet section, 7, a rear bearing body, 8, an impeller, 9, a sealing ring, 10, a thread groove, 11, an angular contact bearing, 12, a front adjusting bolt, 13, a rear adjusting bolt, 14, a guide vane, 15, a guide vane sleeve, 16 and a balance hole.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "vertical", "circumferential", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

With reference to fig. 1-4, a segment type multistage centrifugal pump without a balancing device comprises a casing 1 and a rotating shaft 2, wherein the rotating shaft 2 is arranged inside the casing 1;

the shell 1 comprises a front bearing body 3, a water inlet section 4, a middle section 5, a water outlet section 6 and a rear bearing body 7, wherein an impeller 8 is connected to the outer side of the rotating shaft 2, the impeller 8 and the middle section 5 rotate in a matched manner, a guide vane 14 is arranged on the rear side of the impeller 8, guide vane sleeves 15 are arranged on the rear sides of the guide vane 14 and the impeller 8, a sealing ring 9 is arranged between the front side of the impeller 8 and the middle section 5, and four threaded grooves 10 are arranged on the rear side of the impeller 8;

the clearance area S1 between the front side of the impeller 8 and the sealing ring 9 and the clearance area S2 between the rear side of the impeller 8 and the guide vane 14 are equal;

an angular contact bearing 11 is arranged between the rear bearing body 7 and the rotating shaft 2, a front adjusting bolt 12 and a rear adjusting bolt 13 are arranged in the rear bearing body 7, and the front adjusting bolt 12, the rear adjusting bolt 13 and the rotating shaft 2 form a limiting mechanism.

The front side of the guide vane sleeve 15 is provided with a balance hole 16, and two ends of the balance hole 16 penetrate through the rear side of the impeller 8.

The front bearing body 3 and the rear bearing body 7 are lubricated by lubricating oil.

In the specific implementation of the present invention, with reference to fig. 2, the difference between the front clearance area S1 of the impeller 8 and the rear clearance area S2 of the impeller 8 is not large. The area S3 of the balance hole 16 is (1.1 to 1.2) the rear leakage area S2 of the impeller 8, and the designed lower lift of the impeller 8 is small. The impeller 8 front and rear gap lengths L1 are generally equal to L2. The force F1 is F2, and the radial dimension difference a between the front and rear clearances of the impeller 8 is calculated so that the front force-receiving area S4 is equal to the rear force-receiving area S5.

Meanwhile, the rear sealing part of the impeller 8 is provided with a thread groove 10, and the thread groove 10 rotates clockwise when viewed from the back of the impeller 8, so that the leakage amount is reduced.

The rear bearing body 7 is provided with 2 front adjusting bolts 12 and 1 rear adjusting bolt 13, the width of the rear clearance of the impeller 8 can be adjusted, and the rotor part is fixed. An angular contact bearing 11 is arranged in the rear bearing body 7 and can bear a small part of residual axial force.

After the last-stage impeller 8, the balancing device is cancelled, there is almost no flow leakage, in contrast to a traditional segmented multistage pump of the same type: the consumed shaft power is the same, and the discharged flow of the novel sectional type multi-stage pump is increased by 3-10 percent; the number of easily damaged parts is reduced, the maintenance cost is reduced, and the overhaul time of the pump body is delayed.

The sealing parts of the impeller 8 and the guide vane 14 can be subjected to build-up welding during the overhaul of the pump, and are machined by a lathe without replacement.

The front bearing body 3 and the rear bearing body 7 are changed into lubricating oil for lubrication, so that the heat dissipation performance is good, the position where oil can be directly discharged can be refueled at any time, and the bearing is better maintained.

As an improvement, the impeller 8, the sealing ring 9, the guide vane 14 and the guide vane sleeve 15 are respectively provided with a matched sealing part. Each impeller 8, the middle section 5, the sealing ring 9, the guide vane 14 and the guide vane sleeve 15 form a self-balancing device, and almost no axial force is generated by using the balancing hole 16.

The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims (3)

1. The utility model provides a cancellation balancing unit's festival segmentation multistage centrifugal pump, includes casing (1) and pivot (2), pivot (2) set up inside casing (1), its characterized in that:

the shell (1) comprises a front bearing body (3), a water inlet section (4), a middle section (5), a water outlet section (6) and a rear bearing body (7), wherein an impeller (8) is connected to the outer side of the rotating shaft (2), the impeller (8) and the middle section (5) are matched to rotate, a guide vane (14) is arranged on the rear side of the impeller (8), guide vane sleeves (15) are arranged on the rear sides of the guide vane (14) and the impeller (8), a sealing ring (9) is arranged between the front side of the impeller (8) and the middle section (5), and four thread grooves (10) are arranged on the rear side of the impeller (8);

the clearance area S1 between the front side of the impeller (8) and the sealing ring (9) and the clearance area S2 between the rear side of the impeller (8) and the guide vane (14) are equal;

an angular contact bearing (11) is arranged between the rear bearing body (7) and the rotating shaft (2), a front adjusting bolt (12) and a rear adjusting bolt (13) are arranged in the rear bearing body (7), and the front adjusting bolt (12) and the rear adjusting bolt (13) and the rotating shaft (2) form a limiting mechanism.

2. The segmented multistage centrifugal pump of claim 1 with out balancing means, wherein: the front side of the guide vane sleeve (15) is provided with a balance hole (16), and two ends of the balance hole (16) penetrate through the rear side of the impeller (8).

3. The segmented multistage centrifugal pump of claim 1 with out balancing means, wherein: the front bearing body (3) and the rear bearing body (7) are lubricated by lubricating oil.

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