CN210106058U

CN210106058U - Multistage centrifugal pump type main shaft sealing device

Info

Publication number: CN210106058U
Application number: CN201920392409.0U
Authority: CN
Inventors: 徐大荣; 谢国华; 罗名声
Original assignee: Hangzhou Dalu Power Generation Equipment Co Ltd
Current assignee: Hangzhou Dalu Power Generation Equipment Co Ltd
Priority date: 2019-03-26
Filing date: 2019-03-26
Publication date: 2020-02-21
Anticipated expiration: 2029-03-26

Abstract

The utility model discloses a multistage centrifugal pump formula main shaft seal device, including casing, sealed chamber, the main shaft of setting in the casing, still include the sealed casing assembly that links to each other with the casing, sealed casing assembly sets up the radial outside at the main shaft, form a plurality of annular cavity between sealed casing assembly and the main shaft, annular cavity arranges in proper order along the axial of main shaft, communicates each other between two adjacent annular cavities, and the annular cavity that is closest to the casing is linked together with sealed chamber, and every annular cavity is internal all to be provided with the impeller, the impeller links to each other with the main shaft is coaxial, the last water sucking mouth of impeller sets up the one side of keeping away from the casing. The utility model discloses utilize the main shaft to drive the impeller rotation and take out water in the sealed chamber in the casing, pivot and other parts not direct contact, consequently do not have wearing and tearing, long service life, and sealed effect can not descend after long-time the use, good reliability.

Description

Multistage centrifugal pump type main shaft sealing device

Technical Field

The utility model relates to a sealed technical field, in particular to multistage centrifugal pump formula main shaft seal device.

Background

At present, a sealing structure is required to be arranged at the position where a main shaft of the water turbine penetrates through a shell, so that water leakage is avoided. The sealing method commonly used at present is to arrange a sealing element between a main shaft and a shell, and belongs to contact type sealing. For example, chinese patent publication No. CN106439027B discloses a sealing device for a guide vane sleeve of a water turbine, which includes an annular sealing member, a gland, and a connecting member, wherein the annular sealing member is fitted and sleeved on the guide vane sleeve, and a bottom surface of the annular sealing member abuts against an upper surface of a top cover, and the gland is sleeved on the guide vane sleeve; the gland includes base section of thick bamboo and connecting portion, and connecting portion pass through the connecting piece and are connected with the top cap, and the bottom surface of base section of thick bamboo can oppress under the state that connecting piece and top cap are connected and lean on annular sealing member. The sealing device for the guide vane sleeve of the water turbine provided by the invention has the advantages that the sealing is formed between the annular sealing piece and the guide vane sleeve and between the annular sealing piece and the top cover at the same time, so that the gap between the guide vane sleeve and the top cover is effectively blocked, and the water seepage phenomenon is prevented. The sealing means adopted by the invention is actually contact sealing, and the annular sealing element is easy to wear after the guide vane sleeve rotates for a long time, the sealing effect is reduced, and the water leakage condition is easy to occur.

Disclosure of Invention

The utility model aims at solving and adopting the contact to seal between the main shaft of current hydraulic turbine and the casing, the main shaft rotates the easy wearing and tearing of back sealing member for a long time and leads to the sealed effect decline of sealing member to take place the problem of leaking easily, provides a multistage centrifugal pump formula main shaft sealing device, can effectively solve above-mentioned problem.

The utility model aims at realizing through the following technical scheme: the utility model provides a multistage centrifugal pump formula main shaft sealing device, includes the casing, sets up sealed chamber, the main shaft in the casing, still includes the sealed shell assembly that links to each other with the casing, the sealed shell assembly sets up in the radial outside of main shaft, form a plurality of annular cavity between sealed shell assembly and the main shaft, annular cavity arranges in proper order along the axial of main shaft, communicates each other between two adjacent annular cavities, and the annular cavity that is closest to the casing is linked together with sealed chamber, and every annular cavity is internal all to be provided with the impeller, the impeller links to each other with the main shaft is coaxial, the last water sucking mouth of impeller sets up the one side of keeping away from the casing.

The utility model discloses in, when the main shaft was rotatory, can drive impeller synchronous revolution, the water that gets into in the annular cavity body can be in the sealed chamber of reverse suction casing under the effect of impeller to avoided the junction of water-washed main shaft and casing to spill, thereby realized sealed purpose. The utility model discloses in, pivot and other parts direct contact not, consequently do not have wearing and tearing, long service life, and can not descend in the sealed effect of long-time back of using, the good reliability. The utility model discloses can set up the quantity of annular cavity and impeller according to the actual demand is nimble, realize good sealed effect through the mode of multistage seal.

Preferably, the seal housing assembly comprises a plurality of seal housings which are sequentially arranged along the axial direction of the main shaft, two adjacent seal housings are in seal connection, the seal housing close to the housing is in seal connection with the housing, an annular cavity is formed between each seal housing and the main shaft, and an annular gap is formed between one side of each seal housing, which faces the main shaft, and the outer annular surface of the main shaft. The sealing shell assembly is formed by sequentially connecting a plurality of sealing shells, so that the number of the sealing shells can be conveniently adjusted according to actual needs, and the number of the impellers is correspondingly adjusted, so that the sealing degree between the main shaft and the shell can be conveniently adjusted according to actual needs. The annular clearance between seal shell and the main shaft can avoid main shaft and seal shell direct contact, prevents to produce wearing and tearing between the two, and secondly, annular clearance can be with two adjacent annular cavity intercommunications, like this, the water that gets into in the annular cavity can pass each annular cavity in proper order under the effect of impeller and take out to the sealed chamber in the casing in the contrary.

Preferably, a sealing ring is arranged between two adjacent sealing shells.

Preferably, the adjacent two sealed housings are connected through bolts.

Preferably, one side of the sealing shell facing the impeller is provided with an annular boss, the annular boss extends into the water suction port of the impeller, and an annular gap is formed between the annular boss and the water suction port. The annular boss blocks a water suction port of the impeller and slows down the backflow of water in the impeller.

Preferably, a seal ring seat is arranged at one end, far away from the shell, of the seal shell assembly, an inflatable seal ring is embedded in the seal ring seat, and the inflatable seal ring is located on the radial outer side of the main shaft; an inflation tube is further arranged on the sealing ring seat, and one end of the inflation tube is connected with the inflation sealing ring; and the inflatable sealing ring is in sealing fit with the main shaft in an inflated state. The inflatable sealing ring is used when the water turbine is in a stop state. When the water turbine is in a shutdown state, the inflation pipe can be used for inflating gas into the inflation sealing ring, and the inflation sealing ring expands to be in sealing fit with the main shaft, so that a sealing effect is achieved. When the water turbine is started, gas is discharged from the inflatable sealing ring, the inflatable sealing ring is contracted and separated from the main shaft, and the main shaft cannot abrade the inflatable sealing ring when rotating.

Preferably, the seal ring seat comprises a lower seal ring seat and an upper seal ring seat, the lower seal ring seat and the upper seal ring seat are connected through a bolt, the lower seal ring seat is connected with the seal shell assembly in a sealing mode, a first annular groove matched with the inflatable seal ring is formed in the lower seal ring seat, a second annular groove matched with the inflatable seal ring is formed in the upper seal ring seat, the first annular groove corresponds to the second annular groove, and the inflatable seal ring is arranged between the first annular groove and the second annular groove. The sealing ring seat is designed into a structure that the lower sealing ring seat and the upper sealing ring seat are buckled with each other, so that the installation of the inflatable sealing ring is convenient.

The utility model has the advantages that: the utility model discloses utilize the main shaft to drive the impeller rotation and take out water in the sealed chamber in the casing, pivot and other parts not direct contact, consequently do not have wearing and tearing, long service life, and sealed effect can not descend after long-time the use, good reliability.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is an enlarged view of a portion a in fig. 1.

In the figure: 1. the sealing device comprises a shell, 2, a main shaft, 3, a sealing shell, 4, an impeller, 5, an annular cavity, 6, a lower sealing ring seat, 7, an upper sealing ring seat, 8, an inflatable sealing ring, 9, an inflatable tube, 10, an annular boss, 11, a fastening screw, 12 and a sealing cavity.

Detailed Description

The invention will be further described with reference to the following detailed description and accompanying drawings.

Example (b): as shown in fig. 1 to 2, a multistage centrifugal pump type spindle sealing device includes a housing 1 and a spindle 2. A sealed chamber 12 is provided in the housing 1. The spindle 2 passes through the housing 1. The shell 1 is provided with a sealed shell assembly. The seal housing assembly is disposed radially outward of the main shaft 2. The sealed housing assembly comprises a plurality of sealed housings 3. The sealed housings 3 are arranged in sequence along the axial direction of the main shaft 2. In the present embodiment, two seal housings 3 are provided. The seal housings 3 are each disposed radially outside the main shaft 2. And two adjacent sealed shells 3 are connected in a sealing way. And a sealing ring is arranged between two adjacent sealing shells 3. Two adjacent sealed housings 3 are connected through bolts. A sealed housing 3 adjacent to the housing 1 is sealingly connected to the housing 1. A sealing ring is arranged between the sealing shell 3 close to the shell 1 and the shell 1. The sealed shell 3 close to the shell 1 is connected with the shell 1 through bolts. The sealing case 3 is annular. An annular cavity 5 is formed between each seal housing 3 and the main shaft 2. An annular gap is arranged between one side of each sealing shell 3 facing the main shaft 2 and the outer annular surface of the main shaft 2. Two adjacent annular cavities 5 are communicated through an annular gap. The annular chamber 5 closest to the housing 1 communicates with the seal chamber 12,

an impeller 4 is arranged in each annular cavity. The impeller 4 is coaxially connected to the main shaft 2. The impeller 4 used in the utility model is the conventional impeller at present. The impeller comprises a front cover plate and a rear cover plate, and blades are arranged between the front cover plate and the rear cover plate. The impeller 4 is provided with a hub which is sleeved on the main shaft. The hub is provided with a threaded hole, and a fastening screw 11 is connected with the threaded hole in a threaded manner. The front end of the fastening screw 11 abuts against the outer circumferential surface of the main shaft 2. The impeller 4 is provided with an annular water suction port. The water suction opening is arranged at the side far away from the shell 1. The side of the seal housing 3 facing the impeller 4 is provided with an annular boss 10. The annular boss 10 extends into the water suction port of the impeller 4. An annular gap is arranged between the annular boss 10 and the water suction port. When the main shaft rotates, the impeller is driven to rotate synchronously, and when the impeller rotates, water in the annular cavity can enter the impeller from the water suction port of the impeller and then sequentially passes through the annular cavities to be sucked into the sealing cavity in a reverse mode under the action of the impeller, so that the sealing effect is achieved.

And one end of the sealing shell assembly, which is far away from the shell 1, is provided with a sealing ring seat. And an inflatable sealing ring 8 is embedded on one side of the sealing ring seat facing the main shaft 2. The pneumatic seal ring 8 is located radially outside the main shaft 2. The sealing ring seat is also provided with an inflation tube 9. One end of the air inflation tube 9 is connected with the air inflation sealing ring 8. The inflatable sealing ring 8 is in sealing fit with the main shaft 2 in an inflated state. The seal ring seat comprises a lower seal ring seat 6 and an upper seal ring seat 7. The lower seal ring seat 6 and the upper seal ring seat 7 are connected through bolts. The lower seal ring seat 7 is connected with the seal shell assembly in a sealing way. The lower sealing ring seat 6 is provided with a first annular groove matched with the inflatable sealing ring 8, the upper sealing ring seat 7 is provided with a second annular groove matched with the inflatable sealing ring 8, the first annular groove corresponds to the second annular groove, and the inflatable sealing ring 8 is arranged between the first annular groove and the second annular groove. The inflatable sealing ring is used when the water turbine is in a stop state. When the water turbine is in a shutdown state, the inflation pipe can be used for inflating gas into the inflation sealing ring, and the inflation sealing ring expands to be in sealing fit with the main shaft, so that a sealing effect is achieved. When the water turbine is started, gas is discharged from the inflatable sealing ring, the inflatable sealing ring is contracted and separated from the main shaft, and the main shaft cannot abrade the inflatable sealing ring when rotating.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the principles of the present invention.

Claims

1. The utility model provides a multistage centrifugal pump formula main shaft sealing device, includes casing (1), sets up sealed chamber (12), main shaft (2) in casing (1), its characterized in that: still include the seal shell assembly who links to each other with casing (1), the seal shell assembly sets up in the radial outside of main shaft (2), form a plurality of annular cavity between seal shell assembly and main shaft (2), annular cavity arranges along the axial of main shaft (2) in proper order, communicates each other between two adjacent annular cavities, and annular cavity (5) and seal chamber (12) the intercommunication that are closest to casing (1) all are provided with impeller (4) in every annular cavity (5), impeller (4) and main shaft (2) are coaxial continuous, the one side of keeping away from casing (1) is being set up to the mouth that absorbs water on impeller (4).

2. The multi-stage centrifugal pump type spindle sealing device as claimed in claim 1, wherein the seal housing assembly comprises a plurality of seal housings (3) sequentially arranged along the axial direction of the spindle (2), two adjacent seal housings (3) are connected in a sealing manner, the seal housing (3) close to the housing (1) is connected in a sealing manner with the housing (1), an annular cavity (5) is formed between each seal housing (3) and the spindle (2), an annular gap is formed between one side of each seal housing (3) facing the spindle (2) and the outer annular surface of the spindle (2), and two adjacent annular cavities (5) are communicated with each other through the annular gap.

3. A multi-stage centrifugal pump spindle seal according to claim 2 in which a seal ring is provided between two adjacent seal housings (3).

4. A multi-stage centrifugal pump type spindle seal device according to claim 2, wherein adjacent two seal housings (3) are connected by bolts.

5. A multi-stage centrifugal pump spindle seal according to claim 1, characterized in that the side of the seal housing (3) facing the impeller (4) is provided with an annular boss (10), the annular boss (10) extends into the water suction opening of the impeller (4), and an annular gap is provided between the annular boss (10) and the water suction opening.

6. A multi-stage centrifugal pump type spindle sealing device according to claim 1, 2, 3, 4 or 5, characterized in that one end of the sealing shell assembly, which is far away from the shell (1), is provided with a sealing ring seat, an inflation sealing ring (8) is embedded in the sealing ring seat, and the inflation sealing ring (8) is positioned at the radial outer side of the spindle (2); an inflation tube (9) is further arranged on the sealing ring seat, and one end of the inflation tube (9) is connected with the inflation sealing ring (8); and the inflatable sealing ring (8) is in sealing fit with the main shaft (2) in an inflated state.

7. The multistage centrifugal pump type spindle sealing device according to claim 6, wherein the seal ring seat comprises a lower seal ring seat (6) and an upper seal ring seat (7), the lower seal ring seat (6) and the upper seal ring seat (7) are connected through a bolt, the lower seal ring seat (6) and the seal housing assembly are connected in a sealing mode, a first annular groove matched with the inflatable seal ring (8) is formed in the lower seal ring seat (6), a second annular groove matched with the inflatable seal ring (8) is formed in the upper seal ring seat (7), the first annular groove corresponds to the second annular groove, and the inflatable seal ring (8) is arranged between the first annular groove and the second annular groove.