CN211778018U - Double-cylinder multistage centrifugal pump - Google Patents

Abstract

The utility model discloses a binocular body multistage centrifugal pump, its characterized in that: the centrifugal pump comprises an integrally formed outer barrel body, wherein a liquid inlet and a liquid outlet are formed in the outer barrel body, two ends of the outer barrel body are respectively connected with end covers through flange structures, a sealing assembly is further connected to the outer side of each end cover, a bearing box is arranged on the outer side of each sealing assembly, bearing assemblies are arranged in each bearing box, a pump shaft is supported by the bearing assemblies in each bearing box in a rotating mode, the part, located inside the outer barrel body, of the pump shaft is connected with a plurality of impellers in a key mode, each impeller is located in one segment body, the adjacent segment bodies are connected with each other to form an inner shell, each segment body is provided with an inlet and an outlet, the inlet end of each inner shell is matched with the position of the liquid inlet, a cavity between the inner shell and the outer barrel body is a high-pressure cavity.

Description

Double-cylinder multistage centrifugal pump

Technical Field

The utility model relates to a water pump field, especially a binocular body multistage centrifugal pump.

Background

A plurality of impellers are connected in series on a pump shaft of the multi-stage pump, and after the impellers pressurize conveyed media respectively, a higher lift can be obtained, so that the multi-stage pump needs to be used under the working condition requirement of high lift. The pressure of the inner cavity of the pump body of the multistage pump is relatively large, the high pressure is compared with the atmospheric pressure outside the multistage pump, the pressure difference is very large, and therefore the sealing performance of the multistage pump needs to be guaranteed, and therefore how to effectively seal the existing multistage pump is always one of the key problems. Because the casing of traditional multistage pump is mostly by the mutual concatenation formation of a plurality of parts, just need set up comparatively reliable seal structure like this in the concatenation department, lead to overall structure complicated, no matter make or overhaul all to have great problem. Meanwhile, due to the limitation of the self condition of the multistage pump, even if a sealing structure is arranged, the possibility of leakage still exists in the long-time use process. In actual operation, a plurality of liquids (such as toxic and harmful liquids) which are strictly required and are not allowed to leak cannot be pumped by the multistage pump, so that the multistage pump has great limitations.

There is therefore a need for a method or apparatus that addresses the above-mentioned problems.

Disclosure of Invention

The utility model relates to a solve the above-mentioned not enough that prior art exists, provide a simple structure, design benefit, rationally distributed can bear great interior pressure, and effectively prevent the binocular multistage centrifugal pump that leaks.

The technical solution of the utility model is that: a double-cylinder multistage centrifugal pump is characterized in that: the centrifugal pump comprises an integrally formed outer barrel body 1, wherein a liquid inlet 2 and a liquid outlet 3 are arranged on the outer barrel body 1, two ends of the outer barrel body 1 are respectively connected with an end cover 4 through flange structures, the outer side of the end cover 4 is also connected with a sealing assembly, a bearing box 5 is arranged on the outer side of the sealing assembly, bearing assemblies are arranged in the bearing boxes 5, a pump shaft 6 is supported by the bearing assemblies in the bearing boxes 5 in a rotating mode, a plurality of impellers 7 are connected to the part, located in the outer barrel body 1, of the pump shaft 6 in a key mode, each impeller 7 is located in one sectional body 8, adjacent sectional bodies 8 are connected with each other to form an inner shell, each sectional body 8 is provided with an inlet and an outlet, the inlet end of each inner shell is matched with the position of the liquid inlet 2, a cavity between each inner shell and the outer barrel body 1 is a high-pressure cavity 9, and the outlet,

the bearing assembly is a rolling bearing.

Compared with the prior art, the utility model, have following advantage:

this kind of structural style's binocular body multistage centrifugal pump, its simple structure, design benefit, rationally distributed, it exists to traditional multistage pump: the centrifugal pump has the advantages that the centrifugal pump is large in internal pressure, difficult to seal and the like, a special structure is designed, the outer cylinder body of the centrifugal pump is manufactured by adopting an integral forming process, so that the compression resistance is good, and the centrifugal pump can normally, safely, reliably and low in operation only by solving the problem of tightness between the outer cylinder body and one side of the large end cover. Because the multiple sectional bodies forming the inner shell are jointly positioned in the same temperature and pressure environment, the thermal expansion of the multiple sectional bodies can be kept consistent, so that the adjacent sectional bodies are close to each other under the action of hydraulic pressure, and because the hydraulic pressure in the high-pressure cavity is higher than the hydraulic pressure in the separate sectional bodies, the sealing problem among the sectional bodies does not need to be considered, a large number of sealing structures can be saved, and the purpose of reducing the cost is achieved. The double-cylinder multistage centrifugal pump has the advantages of simple manufacturing process and low manufacturing cost, so that the double-cylinder multistage centrifugal pump has various advantages, is particularly suitable for popularization and application in the field, and has a very wide market prospect.

Drawings

Fig. 1 is a schematic view of the overall structure of the embodiment of the present invention.

Detailed Description

The following description will explain embodiments of the present invention with reference to the drawings. As shown in fig. 1: a double-cylinder multistage centrifugal pump comprises an integrally formed outer cylinder body 1, a liquid inlet 2 and a liquid outlet 3 are arranged on the outer cylinder body 1, two ends of the outer cylinder body 1 are respectively connected with an end cover 4 through flange structures, a sealing assembly is further connected on the outer side of the end cover 4, a bearing box 5 is arranged on the outer side of the sealing assembly, bearing assemblies are arranged in the bearing box 5, a pump shaft 6 is supported by the bearing assemblies in the bearing boxes 5 in a rotating mode, a plurality of impellers 7 are connected on the portion, located inside the outer cylinder body 1, of the pump shaft 6 in a key mode, each impeller 7 is located in one subsection body 8, adjacent subsection bodies 8 are connected with each other to form an inner shell, each subsection body 8 is provided with an inlet and an outlet, the inlet end of the inner shell is matched with the position of the liquid inlet 2, and a high-pressure cavity 9 is formed between the inner shell and the outer cylinder, the outlet end of the inner shell is communicated with the high-pressure cavity 9; the bearing assembly is a rolling bearing.

The utility model discloses binocular body multistage centrifugal pump's working process as follows: the free end of a pump shaft 6 is connected with an output shaft of a motor through a coupler, the motor is started, the pump shaft 6 which is rotatably supported through a bearing assembly is driven by the motor to rotate, all impellers 7 connected with the pump shaft are further driven to rotate, a first-stage impeller which is closest to a liquid inlet 2 sucks a medium to be pumped from the liquid inlet 2, the medium is pressurized and then discharged, the pressurized medium is sucked by a second-stage impeller and then discharged, the rest is done in the same way, until the last-stage impeller pressurizes the medium and then discharges the medium into a high-pressure cavity 9, and finally the medium is discharged through a liquid outlet 3; at this time, the pressure of the medium in the high-pressure cavity 9 is far greater than the pressure of the medium flowing in each segment body 8, and since the liquid only flows from the side with high pressure to the side with low pressure, the problem of leakage of the inner shell formed by connecting a plurality of segment bodies 8 does not need to be considered, and meanwhile, because all the segment bodies 8 are in the high-pressure environment under the same condition, the thermal expansion can be kept consistent, so that the adjacent segment bodies 8 are close to each other under the hydraulic action, and a sealing structure does not need to be arranged between the adjacent segment bodies 8;

the outer cylinder body 1 is manufactured by adopting an integral forming process, so that relatively high pressure can be borne, and the whole pump body can be prevented from leaking only by arranging a sealing structure capable of realizing good sealing between the outer cylinder body 1 and the end cover 4; because the outer shell 1 and the end cover 4 are connected with each other through a flange structure, good sealing can be realized only by arranging a sealing ring and other conventional sealing mechanisms.

Claims (1)

1. A double-cylinder multistage centrifugal pump is characterized in that: the centrifugal pump comprises an integrally formed outer barrel body (1), wherein a liquid inlet (2) and a liquid outlet (3) are formed in the outer barrel body (1), two ends of the outer barrel body (1) are respectively connected with an end cover (4) through flange structures, a sealing assembly is further connected to the outer side of the end cover (4), a bearing box (5) is arranged on the outer side of the sealing assembly, bearing assemblies are arranged in the bearing box (5), a pump shaft (6) is supported by the bearing assemblies in the two bearing boxes (5) in a co-rotating manner, a plurality of impellers (7) are connected to the part, located inside the outer barrel body (1), of the pump shaft (6) in a key manner, each impeller (7) is located in one sectional body (8), adjacent sectional bodies (8) are connected with each other to form an inner shell, each sectional body (8) is provided with an inlet and an outlet, the inlet end of the inner shell is matched with the position of the liquid inlet (, the cavity between the inner shell and the outer cylinder (1) is a high pressure cavity (9), the outlet end of the inner shell is communicated with the high pressure cavity (9),

the bearing assembly is a rolling bearing.

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