CN209743228U

CN209743228U - Sealing structure of sectional type multistage pump

Info

Publication number: CN209743228U
Application number: CN201822216794.1U
Authority: CN
Inventors: 胡凯; 陈晶晶
Original assignee: Shanghai Liancheng Group Co Ltd
Current assignee: Shanghai Liancheng Group Co Ltd
Priority date: 2018-12-27
Filing date: 2018-12-27
Publication date: 2019-12-06
Anticipated expiration: 2028-12-27

Abstract

The utility model provides a seal structure of festival segmentation multistage pump, including pump shaft, middle section, impeller, axle sleeve, stator and set screw, every grade be equipped with an impeller, an axle sleeve and a stator in the middle section, impeller mounting is on the pump shaft, the outer wall of the one end of the wheel hub import department of impeller is sealed with the department's clearance that corresponds of middle section inner wall, the axle sleeve suit is on the pump shaft, the axle sleeve is second grade ladder structure, the thickness of the less diameter part of axle sleeve is the same with impeller wheel hub's thickness, the terminal surface of the great diameter part of axle sleeve offsets with impeller wheel hub's other end terminal surface, the partial overcoat stator of great diameter of axle sleeve, the inner wall of impeller wheel hub is sealed with the outer wall clearance of the. The outer wall of the large-diameter part of the secondary stepped shaft sleeve and the guide impeller hub inner wall matched sealing structure are adopted, when the gap is found to exceed the standard during maintenance, only the shaft sleeve needs to be replaced, the cost of the shaft sleeve is far lower than that of an impeller, the cost can be greatly reduced, and the sealing effect is improved.

Description

Sealing structure of sectional type multistage pump

Technical Field

The utility model relates to a festival segmentation multistage pump especially relates to a seal structure of festival segmentation multistage pump.

Background

Referring to fig. 1, in the sealing structure of the segment type multistage pump, water flows in from an inlet a of an impeller 3, rotates through the impeller 3 to do work, flows out from an outlet B of the impeller 3 to enter a guide vane 5, a flow passage transition region of the guide vane 5 is arranged at a position C, the water flows to an outlet D of the guide vane 5 from the position C, and then flows out from the outlet D of the guide vane 5 to the inlet a of the next impeller 3, so that a segment pressurization process is formed. In fig. 1, F is a sealing area between the segments for preventing the high-pressure water on the inlet a side of the next impeller 3 from flowing back to the pressure side communicating with the outlet B area of the impeller 3 of the present stage, thereby reducing the volume loss. F department is the fitting surface of 5 wheel hub inner walls of stator and 3 wheel hub outer walls of impeller contact department, and general diameter clearance is 0.3mm ~0.5mm, through high-speed rotatory impeller 3 and static stator 5 and clearance fit, plays sealed effect.

The existing structure has certain defects:

1. The maintenance cost is high: the working mechanism of the F area shows that friction loss exists at the impeller and the guide vane, the sizes of the matching surfaces of the impeller and the guide vane need to be checked regularly, the gap value is not overproof, when the gap is overproof, the impeller can be replaced to ensure the sealing gap, the impeller is used as one of main components, and the maintenance cost is high.

2. The sealing effect is poor: the effective matching length of the impeller 3 and the guide vane 5 at the position F (namely the length of the area, close to the superposition, at the position F in the drawing) is one of main factors influencing the sealing effect, and due to the structure and the cost, the left length and the right length of the impeller cannot be too large, so that the effective length is as shown in figure 1, and the effective length cannot be too large, so that the sealing effect is poor.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides a seal structure of festival segmentation multistage pump.

The purpose of the utility model can be realized by the following technical scheme: a sealing structure of a sectional multi-stage pump comprises a pump shaft, a middle section, an impeller, a shaft sleeve, a guide vane and a fixing screw, wherein the middle section of each stage is internally provided with the impeller, the shaft sleeve and the guide vane, the impeller is arranged on the pump shaft through a key, the gap between the outer wall of one end of the hub inlet of the impeller and the corresponding position of the inner wall of the middle section is sealed, the shaft sleeve is sleeved on the pump shaft and is of a two-stage stepped structure, the thickness of the smaller diameter part of the shaft sleeve is the same as that of the impeller hub, the end surface of the larger diameter part of the shaft sleeve is abutted against the end surface of the other end of the impeller hub, the guide vane is sleeved outside the larger diameter part of the shaft sleeve, the stator passes through set screw and middle section fixed connection, and the stator cooperatees with the impeller, and the inner wall of stator and the outer wall clearance seal of the major diameter part of axle sleeve, the axial length of stator is the same with the axial length of the major diameter part of axle sleeve.

Compared with the prior art, the beneficial effects of the utility model are that: through the hub inner wall complex seal structure of the other end outer wall of cancellation impeller wheel hub and stator, adopt the outer wall and the guide vane wheel hub inner wall complex seal structure of the great diameter part of second grade ladder axle sleeve, discover during the maintenance that the clearance exceeds standard, only need change the axle sleeve can, the cost of axle sleeve is less than the impeller far away, the cost consumption that can significantly reduce, and the axial length who improves back seal structure is greater than the axial length who improves preceding seal structure, has improved sealed effect.

drawings

Fig. 1 is a schematic structural diagram of the prior art.

Fig. 2 is a schematic structural diagram of the present invention.

The parts in the figures are numbered as follows:

1 pump shaft, 2 middle sections, 3 impellers, 4 shaft sleeves, 401 large-diameter parts and 5 guide vanes.

Detailed Description

The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings to make it clear to those skilled in the art how to practice the invention. While the invention has been described in connection with its preferred embodiments, these embodiments are intended to be illustrative, and not to limit the scope of the invention.

Referring to fig. 2, a sealing structure of a segment type multistage pump comprises a pump shaft 1, a middle section 2, an impeller 3, a shaft sleeve 4, a guide vane 5 and a fixing screw, wherein an impeller 3, a shaft sleeve 4 and a guide vane 5 are arranged in the middle section 2 of each stage, the impeller 3 is installed on the pump shaft 1 through a key, the outer wall of one end of a hub inlet of the impeller 3 is in clearance seal with the corresponding position of the inner wall of the middle section 2, the shaft sleeve 4 is sleeved on the pump shaft 1, the shaft sleeve 4 is of a two-stage stepped structure, the thickness of a smaller diameter part of the shaft sleeve 4 is the same as that of a hub of the impeller 3, the end surface of a larger diameter part 401 of the shaft sleeve 4 is abutted against the end surface of the other end of the hub of the impeller 3, the guide vane 5 is sleeved outside a larger diameter part 401 of the shaft sleeve 4, the guide vane 5 is fixedly connected with the middle section 2 through the fixing screw, the axial length of the guide vane 5 is the same as the axial length of the larger diameter portion 401 of the sleeve 4.

During assembly, the shaft sleeve 4 is installed on the pump shaft 1, the other end of the hub of the impeller 3 is matched with the larger-diameter part 401 of the shaft sleeve 4 and is installed on the pump shaft 1, the guide vane 5 is installed outside the shaft sleeve 4, the hub of the guide vane 5 and the larger-diameter part 401 of the shaft sleeve 4 are in clearance sealing, the middle section 2 is installed outside the guide vane 5, and the guide vane 5 is fixedly connected with the middle section 2 through a fixing screw.

When the water-saving type impeller is in operation, water flows in from an inlet A of the impeller 3, works through rotation of the impeller 3, flows out from an outlet B of the impeller 3, enters the guide vane 5, a flow passage transition area of the guide vane 5 is arranged at a position C, the water flows to an outlet D of the guide vane 5 from the position C, and then flows out to an inlet A of the next impeller 3 from the position D, so that a primary segment pressurization process is formed. The inner wall of the hub of the guide vane 5 is in clearance seal with the outer wall of the larger diameter part 401 of the shaft sleeve 4, which is a clearance seal part F, and the clearance seal part F forms a seal area between the two middle sections 2 and is used for preventing high-pressure water on the inlet A side of the next impeller 3 from flowing back to the pressure side communicated with the area B, so that the effect of reducing volume loss is achieved.

Through the other end outer wall of cancellation impeller 3 wheel hub and the wheel hub inner wall complex seal structure of stator 5, adopt the outer wall of the great diameter part of second grade ladder axle sleeve 4 and stator 5 wheel hub inner wall complex seal structure, discover during the maintenance that the clearance exceeds standard, only need change axle sleeve 4 can, axle sleeve 4's cost is less than impeller 3 far away, the cost consumption that can significantly reduce, and the axial length who improves back seal structure is greater than the axial length who improves preceding seal structure, sealed effect has been improved.

It should be noted that many variations and modifications of the embodiments of the present invention are possible, which are fully described, and are not limited to the specific examples of the above embodiments. The above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. In conclusion, the scope of the present invention should include those changes or substitutions and modifications which are obvious to those of ordinary skill in the art.

Claims

1. A sealing structure of a sectional multi-stage pump is characterized by comprising a pump shaft, a middle section, impellers, shaft sleeves, guide vanes and fixing screws, wherein an impeller, a shaft sleeve and a guide vane are arranged in the middle section of each stage, the impeller is arranged on the pump shaft through a key, the gap between the outer wall of one end of the hub inlet of the impeller and the corresponding position of the inner wall of the middle section is sealed, the shaft sleeve is sleeved on the pump shaft and is of a two-stage stepped structure, the thickness of the smaller diameter part of the shaft sleeve is the same as that of the impeller hub, the end surface of the larger diameter part of the shaft sleeve is abutted against the end surface of the other end of the impeller hub, the guide vane is sleeved outside the larger diameter part of the shaft sleeve, the stator passes through set screw and middle section fixed connection, and the stator cooperatees with the impeller, and the inner wall of stator and the outer wall clearance seal of the major diameter part of axle sleeve, the axial length of stator is the same with the axial length of the major diameter part of axle sleeve.