CN216895765U

CN216895765U - Sectional combination formula main shaft seal structure

Info

Publication number: CN216895765U
Application number: CN202220073728.7U
Authority: CN
Inventors: 程小龙; 吴世权
Original assignee: Chongqing Datang International Wulong Hydropower Development Co Ltd
Current assignee: Chongqing Datang International Wulong Hydropower Development Co Ltd
Priority date: 2022-01-12
Filing date: 2022-01-12
Publication date: 2022-07-05
Anticipated expiration: 2032-01-12

Abstract

The utility model discloses a sectional combined type main shaft sealing structure, which comprises: seal water inlet pipe way (3), sealed piece (7), ring (8), spring (5), water seal apron (1), floating ring (4) wear, wherein, floating ring (4) are connected through spring (5) in water seal apron (1) below, it has sealed piece (7) to inlay below floating ring (4), sealed piece (7) below and ring (8) zonulae occludens wear, seal water inlet pipe way (3) lower extreme is inlayed in floating ring (4), there is sealed water pressure chamber between sealed piece (7) and ring (8) wear-resisting, seal water inlet pipe way (3) lower extreme exit sets up in sealed water pressure chamber. The sealing structure does not need to be too high in installation requirement, greatly reduces installation difficulty, cannot be influenced by deformation, can change according to deformation and abrasion self-adaption, and reduces maintenance cost.

Description

Sectional combination formula main shaft seal structure

Technical Field

The utility model relates to the technical field of sealing, in particular to a sectional combined type main shaft sealing structure.

Background

The existing equipment such as water pumps, water turbines and the like all convey liquid, and the existing equipment has a place where a rotating part of a main shaft is combined with a fixed part, and a sealing device is required to be arranged at the place to prevent fluid from escaping. The efficiency of the unit or the water pump is influenced, and the influence is safe.

At present, the main shaft seal of the water turbine mainly has the following modes: 1. the packing main shaft sealing is a main shaft sealing mode which is simple in structure and most widely applied, and mainly comprises a packing box, an asbestos packing and a compression ring. The method comprises the steps of firstly soaking the asbestos packing with paraffin, then coating carbon powder on the asbestos packing, then cutting the asbestos packing into a plurality of sections and filling the sections into a packing box, and finally pressing the sections by a pressing ring after 3-4 circles of packing are filled. Although the main shaft can be sealed, the main shaft has the greatest defects that the asbestos packing is in direct contact with the main shaft, the main shaft is easy to wear when rotating, and water leakage is serious after the wear. 2. The piston type main shaft seal is a relatively common main shaft seal mode and comprises a piston body, a piston, an anti-wear ring, a stop pin, a bolt, a nut and the like, wherein the piston is arranged in the piston body, and the working principle of the piston is that the piston moves downwards through water pressure and rubs against an anti-wear plate, so that water flow is prevented from passing through the piston, and the purpose of sealing the main shaft is achieved. The sealing structure has the disadvantages that the piston is made of water rubber, and the water rubber has water swelling property, so the requirement of the matching tolerance between the piston and the piston body is quite strict, and the success rate of the sealing structure is not high because the manufacturing tolerance of the rubber is difficult to ensure; in addition, if the operation effect is not good when the piston is installed, the piston is difficult to repair, the piston is difficult to recover due to burning in the operation process, and the rubber has the problem of aging, so that the sealing reliability of the piston is affected. 3. The flat plate type main shaft seal is divided into a single flat plate type main shaft seal and a double-layer flat plate type main shaft seal. The single-plate type main shaft seal utilizes the end surface gap formed by a single-layer rubber plate and a rotating ring fixed on the main shaft to seal by water pressure, has simple structure and good sealing performance, the rubber plate is not in direct contact with the surface of the main shaft, and the main shaft is not abraded like a packing main shaft seal. But the disadvantage is that the water leakage is large after the rubber flat plate is worn and lifted in the using process. The double-layer flat plate main shaft seal utilizes the double-layer rubber flat plate and the upper plane and the lower plane of a turntable fixed on a main shaft, and respectively generates pressure to be attached to the turntable in two opposite directions by the action of water pressure of an inner cavity, thereby playing the role of end face seal. Compared with the single-plate type main shaft seal, the structure is more complex, and the seal has the disadvantages of large water leakage after abrasion and during lifting, more complex adjustment and difficult maintenance. 4. The radial seal utilizes a plurality of layers of carbon blocks or other wear-resistant materials to form a radial seal surface with a wear-resistant bushing sleeved on the main shaft along the radial direction in the modes of a mechanical spring and the like, and the radial seal surface is lubricated by clean water, and the seal block can move radially under the action of the spring after being worn to continuously cling to the main shaft bushing.

Therefore, the existing main shaft sealing structure needs to be improved so as to solve the problems that the requirement for installing the main shaft seal at the present stage is high, and the levelness deviation of the stainless steel antiwear ring is less than 0.02 mm/m; and the equipment is deformed after running, so that the level of the equipment cannot meet the requirement, the abrasion is increased, the water leakage is increased, the overhaul period can be prolonged, the overhaul period is shortened, and the overhaul cost is increased.

SUMMERY OF THE UTILITY MODEL

The utility model provides a sectional combined type main shaft sealing structure which is used for solving the technical problem.

In order to achieve the above object, the present invention provides a sectional and combined spindle sealing structure, which includes: sealed water inlet pipe, sealed piece, ring, spring, water seal apron, the ring that floats of wearing, wherein, spring coupling floating ring is passed through to water seal apron below, the ring below that floats is inlayed and is had sealed piece, sealed piece below and ring zonulae occludens of wearing, sealed water inlet pipe lower extreme is inlayed in floating ring, there is sealed water pressure chamber between sealed piece and the ring of wearing, sealed water inlet pipe lower extreme exit sets up in sealed water pressure intracavity.

And fastening screws are arranged at positions, corresponding to the springs, on the water seal cover plate and used for connecting the water seal cover plate and the springs.

The antiwear ring is made of stainless steel, and the lower end of the antiwear ring is embedded in the flange protective sleeve.

The sealing blocks are formed by tightly connecting sixteen block sealing blocks, and two adjacent block sealing blocks are connected through a fork.

Seven bolt holes are formed in the lower portion of the sealing block, and a fixing spring fixed through bolts is arranged in each bolt hole.

And a drainage area is arranged between the segmented combined type main shaft sealing structure and the main shaft.

The utility model has the beneficial effects that:

(1) dividing the sealing blocks into sixteen equal parts according to a circle, arranging 7 bolt holes below the sealing blocks, installing a spring in each bolt hole and fixing the bolt, connecting every two sealing blocks by using opposite fork openings to ensure that the sealing blocks are connected without dead corners, arranging movable allowance below the floating ring by the sealing blocks, and taking anti-loosening measures by the bolts;

(2) the sealing structure does not need to be too high in installation requirement, so that the installation difficulty is greatly reduced;

(3) the deformation influence is avoided, the self-adaptive change can be realized according to the deformation abrasion, and the maintenance cost is reduced;

(4) the high-efficiency and safe operation of the unit or the water pump can be ensured.

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 the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic view of the structure of the present invention;

FIG. 2 is a schematic cross-sectional view of a seal block installation;

FIG. 3 is a schematic view of a block seal block structure;

in the figure:

1-water seal cover plate, 2-drainage area, 3-sealing water inlet pipeline, 4-floating ring, 5-spring, 6-flange protective sleeve, 7-sealing block and 8-antiwear ring.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the utility model and do not limit the utility model.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

The requirement on the installation of the spindle seal is higher at the present stage, and the levelness deviation of the stainless steel antiwear ring is less than 0.02 mm/m; and the equipment is deformed after running, so that the level of the equipment cannot meet the requirement, the abrasion is increased, the water leakage is increased, the overhaul period is prolonged, the overhaul period is shortened, and the overhaul cost is increased

In order to overcome the above problems, a sectional and combined spindle sealing structure is proposed, as shown in fig. 1, which includes: sealed water inlet pipe 3, sealed piece 7, ring 8, spring 5, water seal apron 1, floating ring 4 wear-resistantly, wherein, spring 5 connection floating ring 4 is passed through to water seal apron 1 below, the 4 below of floating ring is inlayed and is had sealed piece 7, sealed piece 7 below and ring 8 zonulae occludens wear-resistantly, 3 lower extremes of sealed water inlet pipe inlay in floating ring 4, there is sealed water pressure chamber sealed piece 7 and wear-resistantly between the ring 8, 3 lower extreme exits of sealed water inlet pipe set up in sealed water pressure chamber.

Specifically, the working surface of the sealing block is cleaned and correspondingly checked, and the floating ring is placed on the antiwear ring in a falling mode. The floating ring is rotated and the clearance between the seal block and the antiwear ring is checked. There should be no gap between the sealing block and the wear-resistant ring, and a gap not larger than 0.03mm is allowed in part, but the total length of the gap should not be larger than 50 mm.

Specifically, a channel between the floating block and the sealing ring is used by water and is mainly used for cooling and lubricating, the stainless steel antiwear ring rotates, the floating ring is forbidden, and the stainless steel antiwear ring and the floating ring generate friction and are used for lubricating and reducing abrasion. And used for cooling to avoid the occurrence of a gluing phenomenon.

In this embodiment, a fastening screw is disposed at a position on the water seal cover plate 1 corresponding to the spring 5, and the fastening screw is used for connecting the water seal cover plate 1 and the spring 5.

In this embodiment, the antiwear ring 8 is made of stainless steel, and the lower end of the antiwear ring is embedded in the flange protective sleeve 6.

In this embodiment, as shown in fig. 2 and fig. 3, the sealing block 7 is formed by tightly connecting sixteen block sealing blocks, and two adjacent block sealing blocks are connected by using a pair of fork openings.

In this embodiment, seven bolt holes are arranged below the sealing block 7, and each bolt hole is internally provided with a fixing spring fixed by a bolt.

In this embodiment, a drainage area 2 is provided between the segmented combined spindle sealing structure and the spindle.

Specifically, divide the seal block into sixteen equalling according to the circle equally, set up 7 bolt holes below the seal block, load on the spring and fix with the bolt in every bolt hole, every two seal blocks adopt to connect to the fork mouth, guarantee that the seal block connects no dead angle, the seal block has the surplus of activity below the floating ring, and the bolt must take locking measure.

The foregoing is illustrative of the preferred embodiments of the present invention, and it is to be understood that the utility model is not limited to the precise form disclosed herein and is not to be construed as limited to the exclusion of other embodiments, and that various other combinations, modifications, and environments may be used and modifications may be made within the scope of the concepts described herein, either by the above teachings or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. A segmented combined spindle seal structure, comprising: seal water inlet pipe way (3), sealed piece (7), ring (8), spring (5), water seal apron (1), floating ring (4) wear, wherein, floating ring (4) are connected through spring (5) in water seal apron (1) below, it has sealed piece (7) to inlay below floating ring (4), sealed piece (7) below and ring (8) zonulae occludens wear, seal water inlet pipe way (3) lower extreme is inlayed in floating ring (4), there is sealed water pressure chamber between sealed piece (7) and ring (8) wear-resisting, seal water inlet pipe way (3) lower extreme exit sets up in sealed water pressure chamber.

2. The sectional and combined type spindle sealing structure according to claim 1, wherein a fastening screw is disposed on the water seal cover plate (1) at a position corresponding to the spring (5), and the fastening screw is used for connecting the water seal cover plate (1) and the spring (5).

3. The sectional combined type spindle sealing structure according to claim 1, wherein the antiwear ring (8) is made of stainless steel, and the lower end of the antiwear ring is embedded in the flange protective sleeve (6).

4. The sectional and combined type spindle sealing structure as claimed in claim 1, wherein the sealing block (7) is formed by tightly connecting sixteen sectional sealing blocks, and two adjacent sectional sealing blocks are connected by using a fork.

5. The segmental combined type main shaft sealing structure as claimed in claim 1, wherein seven bolt holes are formed below the sealing block (7), and a fixing spring fixed by a bolt is installed in each bolt hole.

6. A segmented combined spindle seal according to claim 1, characterised in that a drain (2) is provided between the segmented combined spindle seal and the spindle.