CN217633078U

CN217633078U - Modular fluid seal for a centrifugal pump and centrifugal pump

Info

Publication number: CN217633078U
Application number: CN202221676792.0U
Authority: CN
Inventors: 张衡; 王宏元
Original assignee: Taicang Egger Pump Co ltd
Current assignee: Taicang Egger Pump Co ltd
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2022-10-21
Anticipated expiration: 2032-06-30

Abstract

The utility model discloses a modularization fluid seal device and including this sealing device's centrifugal pump for centrifugal pump. The sealing device comprises: the shaft sleeve is sleeved on a pump shaft of the centrifugal pump; the shells are sequentially sleeved on the shaft sleeve, and each shell and the shaft sleeve form a cavity respectively; a plurality of auxiliary impellers, wherein one auxiliary impeller is correspondingly arranged in each cavity; the end cover enables the shell on the outermost side to be fixedly connected with the shaft sleeve; and the parking seal is sleeved on the shaft sleeve and is fixed by the end cover. The sealing device of the centrifugal pump is simple in structure and can be used as an independent sealing module unit, so that the centrifugal pump is convenient to disassemble, assemble and maintain, and meanwhile, the sealing performance is improved.

Description

Modular fluid seal for a centrifugal pump and centrifugal pump

Technical Field

The utility model relates to a centrifugal pump especially relates to a modularization fluid seal device for centrifugal pump.

Background

In the conventional centrifugal pump, as shown in fig. 1, a sealing structure of the centrifugal pump includes a pump shaft 1' in a pump casing 7', a main impeller 3' is connected to the pump shaft 1', and the main impeller 3' includes a main blade 31' on one side and an auxiliary blade 32' on the other side. The function of the secondary blades 32 'is to reduce the pressure in the pump chamber behind the primary impeller 3' to balance the axial forces and prevent particles from entering the seal. The pump shaft 1 'is sleeved with a shaft sleeve 2', an auxiliary impeller 4', a parking seal 6' arranged outside the shaft sleeve 1 'and a fixed guide vane 5'. The sub-impeller 4' corresponds to an impeller of a small centrifugal pump, and when the centrifugal pump is operated, the sub-impeller 4' is rotated to generate a pressure head to prevent high-pressure liquid generated by the rotation of the main impeller 3' from leaking to the outside. The fixed guide vane 5 'is used for eliminating the rotation of liquid and improving the blocking pressure of the auxiliary impeller 4'. When the centrifugal pump is stopped, the secondary impeller 4 'is deactivated, and the medium in the pump chamber is sealed by the stop seal 6'. However, the sealing structure fails to realize modular design, is complex in structure, and can not keep working for a long time due to the fact that the sealing is greatly influenced by working conditions when the centrifugal pump stops running.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defect among the prior art, the embodiment of the utility model provides a modularization fluid seal device for centrifugal pump includes:

the shaft sleeve is sleeved on a pump shaft of the centrifugal pump;

the shells are sequentially sleeved on the shaft sleeve, and each shell and the shaft sleeve form a cavity respectively;

the auxiliary impellers are correspondingly arranged in the cavities;

the end cover enables the shell on the outermost side to be fixedly connected with the shaft sleeve;

and the parking seal is sleeved on the shaft sleeve and is fixed by the end cover.

Further, the casing includes the periphery wall that sets up along the periphery, and follow the periphery wall is along radial top wall that extends near the direction of pump shaft, the shaft sleeve, the periphery wall of casing with the top wall forms the cavity, the auxiliary impeller cover is located the shaft sleeve, holds in the cavity.

Further, four shells are included, the peripheral walls of the adjacent shells are fixedly connected to form four chambers, and each chamber accommodates one auxiliary impeller.

Further, the parking seal comprises a straight-through oil seal and an internal suction type sealing ring.

Further, the parking seal comprises a labyrinth type oil seal and an internal suction type sealing ring.

And furthermore, the two parking seals are sequentially sleeved on the shaft sleeve, and the end covers are arranged on the periphery of the shaft sleeve.

Furthermore, a flushing hole is formed in the end cover, and the end cover can be externally connected with a flushing device through the flushing hole to flush the auxiliary impeller.

Further, the utility model discloses still include a centrifugal pump, this centrifugal pump include the pump shaft, set up in epaxial main impeller of pump, and as above modularization fluid seal device, wherein, the axle sleeve is located the pump shaft, the end cover is kept away from main impeller.

The utility model has the advantages as follows:

the sealing device of the centrifugal pump is simple in structure and can be used as an independent sealing module unit, so that the centrifugal pump is convenient to disassemble, assemble and maintain, and meanwhile, the sealing performance is improved.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a sectional view of a seal structure of a centrifugal pump in the background art of the present invention.

Fig. 2 is a cross-sectional view of a modular fluid seal assembly of a centrifugal pump in an embodiment of the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but 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. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature.

In order to achieve the above object, the present invention provides a centrifugal pump. The centrifugal pump comprises a pump shaft 1, a main impeller connected to the pump shaft 1, and a modular fluid sealing arrangement.

As shown in connection with fig. 2, the modular fluid sealing apparatus includes:

the shaft sleeve 2 is sleeved on a pump shaft 1 of the centrifugal pump;

the shell bodies 3 are sequentially sleeved on the shaft sleeve 2, and each shell body 3 and the shaft sleeve 2 form a cavity respectively;

a plurality of auxiliary impellers 4, wherein one auxiliary impeller 4 is correspondingly arranged in each cavity;

the end cover 5 enables the shell 3 at the outermost side and the shaft sleeve 2 to be fixedly connected, and the end cover 5 is far away from the main impeller;

the parking seal 6 is sleeved on the shaft sleeve 2 and fixed by the end cover 5.

The plurality of auxiliary impellers 4 in the modularized fluid sealing device are equivalent to a multi-stage centrifugal pump, when the centrifugal pump runs, a pressure head generated by the rotation of the plurality of auxiliary impellers 4 resists against high-pressure liquid generated by the rotation of the main impeller to leak outwards, and when the centrifugal pump stops running, a stopping seal 6 seals the medium in a pump cavity to prevent leakage.

Compared with the sealing structure in the prior art, the modular fluid sealing device eliminates the auxiliary blades, and the axial force for balancing the main impeller is generated by a plurality of auxiliary impellers 4. The housing 3 replaces the function of the stay vanes. In addition, the sealing fluid device forms a modular integrated sealing device without the need for individual parts to be mounted or dismounted one by one as in the prior art. The sealing device in the embodiment can be uniformly installed into an integral module in advance, so that the sealing device can be installed on the pump shaft 1 of the centrifugal pump at one time, the installation and the disassembly of the sealing device are greatly facilitated, and meanwhile, the installation times are reduced, and the sealing performance can also be improved.

Preferably, a flushing hole 50 is formed in the end cover 5, and the end cover 5 can be externally connected with a flushing device through the flushing hole 50 to flush the auxiliary impeller 4. The sealing device can be externally connected with a flushing device, so that the auxiliary impeller 4 can be flushed, external particles are prevented from entering a sealing area of the parking seal 6, and the service life of the parking seal 6 is prolonged.

Specifically, in the present embodiment, the housing 3 is cylindrical and includes an outer peripheral wall 31 disposed along a peripheral edge, and a top wall 32 extending from the outer peripheral wall 31 in a direction radially approaching the pump shaft 1, the shaft sleeve 2, the outer peripheral wall 31 of the housing 3 and the top wall 32 form the cavity, and the sub-impeller 4 is sleeved on the shaft sleeve 2 and accommodated in the cavity.

In this embodiment, the pump includes four housings 3, four housings 3 are sequentially arranged along the axial direction of the pump shaft 1, and are adjacent to each other, and the outer peripheral wall 31 of each housing 3 is fixedly connected. The four housings 3 form four said chambers, each of which houses one said expeller wheel 4, and the sealing arrangement therefore comprises four expeller wheels 4. The four auxiliary impellers 4 are equivalent to form a multi-stage centrifugal pump, and the medium in a pump cavity is prevented from leaking outwards when the centrifugal pump is in operation. The sealing effect is improved relative to a secondary impeller in the prior art.

In order to further improve the sealing effect, two parking seals 6 are included in the present embodiment. The two parking seals 6 are in turn fitted to the sleeve 2 and fixed to the sleeve 2 by the end cap 5.

In the present embodiment, the parking seal 6 includes a straight-through oil seal and an inner suction type seal ring. In another embodiment, the parking seal 6 comprises a labyrinth seal and an internal suction seal.

The present invention has been explained by using specific embodiments, and the explanation of the above embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.

Claims

1. A modular fluid seal apparatus for a centrifugal pump, comprising:

the shaft sleeve is sleeved on a pump shaft of the centrifugal pump;

the auxiliary impellers are correspondingly arranged in the cavities;

and the parking seal is sleeved on the shaft sleeve and fixed by the end cover.

2. The modular fluid seal apparatus of claim 1 wherein said housing includes a peripheral wall disposed along a periphery thereof and a top wall extending from said peripheral wall in a direction radially adjacent said pump shaft, said hub, said housing peripheral wall and said top wall forming said chamber, said expeller being received within said chamber in a nested relationship with said hub.

3. The modular fluid seal apparatus for a centrifugal pump of claim 2 including four said housings fixedly connected adjacent a peripheral wall of said housings to form four said chambers, each of said chambers containing one of said expellers.

4. The modular fluid seal apparatus for a centrifugal pump of claim 1, wherein the parking seal comprises a straight-through oil seal and a suction seal.

5. The modular fluid seal apparatus for a centrifugal pump of claim 1, wherein said parking seal comprises a labyrinth seal and an internal suction seal.

6. The modular fluid seal assembly for a centrifugal pump of claim 1 including two said parking seals sequentially nested in said hub and having said end cap on the periphery.

7. The modular fluid seal apparatus of claim 1 wherein said end cap defines a flushing aperture, said end cap being adapted to receive a flushing means therethrough for flushing said secondary impeller.

8. A centrifugal pump comprising a pump shaft, a main impeller disposed on the pump shaft, and the modular fluid seal apparatus of any one of claims 1-7, wherein the shaft sleeve is disposed on the pump shaft and the end cap is distal from the main impeller.