阅读说明：本技术 一种迷宫式密封结构 (Labyrinth seal structure ) 是由 孙忠良 田继发 田家东 于 2021-01-04 设计创作，主要内容包括：本发明的迷宫式密封结构,主要由机壳和隔板组成的定子组、转轴、叶轮和安装在机壳和转轴之间的密封组件等组成,其特征在于：(1)在转轴上设置依次间隔排列设置的密封齿；(2)定子组中隔板上设有配合槽,密封组件直接与配合槽连接或通过螺栓把合连接；(3)密封齿高3.5mm～5mm,齿与齿中心线间距4mm～5mm,两个密封齿之间的夹角为30度；(4)叶轮口圈处密封齿的结构形式不同,密封位置与密封齿数也可不同,一般在4～25齿。(The labyrinth seal structure of the invention, mainly by the stator group that the chassis and baffle make up, spindle, impeller and installing in the chassis and seal assembly, etc. make up between the spindle, characterized by that: (1) sealing teeth which are arranged at intervals in sequence are arranged on the rotating shaft; (2) a matching groove is arranged on a partition plate in the stator group, and the sealing component is directly connected with the matching groove or connected with the matching groove through a bolt handle; (3) the height of the sealing teeth is 3.5 mm-5 mm, the distance between the teeth and the tooth central line is 4 mm-5 mm, and the included angle between the two sealing teeth is 30 degrees; (4) the structural style of impeller mouth circle department seal tooth is different, and sealed position also can be different with the sealed number of teeth, generally at 4 ~ 25 teeth.)

1. The utility model provides a labyrinth seal structure, mainly comprises stator group, pivot, impeller and the seal assembly who installs between casing and pivot that comprises casing and baffle, its characterized in that:

(1) sealing teeth which are arranged at intervals in sequence are arranged on the rotating shaft;

(2) a matching groove is arranged on a partition plate in the stator group, and the sealing component is directly connected with the matching groove or connected with the matching groove through a bolt handle;

(3) the height of the sealing teeth is 3.5 mm-5 mm, the distance between the teeth and the tooth central line is 4 mm-5 mm, and the included angle between the two sealing teeth is 30 degrees;

(4) impeller mouth circle department seals tooth structural style can be diversified, and sealed position also can be different with sealed tooth number, generally at 4 ~ 25 teeth.

2. The labyrinth seal of claim 1 wherein said seal teeth at said impeller lip are of smooth configuration.

3. The labyrinth seal of claim 1 wherein said seal teeth at said impeller lip are of a staggered configuration.

4. The labyrinth seal of claim 1 wherein said seal teeth at said impeller lip are of stepped configuration.

Technical Field

The invention relates to the technical field of compressor sealing, in particular to a labyrinth type sealing structure.

Background

In order to obtain a good operation effect of the centrifugal compressor, a certain gap must be reserved between the rotor and the stator to avoid the occurrence of faults such as friction wear and collision damage therebetween, and meanwhile, the existence of the gap naturally causes leakage phenomena between stages and at the shaft end, and the leakage not only reduces the working efficiency of the compressor but also causes accidents such as environmental pollution and even firing explosion.

The sealing is an effective measure for avoiding the leakage between the compressor stages and the shaft end on the premise of keeping a proper gap between the rotor and the stator, and labyrinth sealing structures appear in compressors, steam turbines and fluid machinery, wherein Chinese patent 201210268646.9 reports labyrinth sealing structures used between a housing and a rotating drum of a horizontal screw centrifuge, and the centrifuge is used for urban sludge dewatering and factory sludge drainage, so that the rotating speed is low, and the structure of a liquid blocking ring and a labyrinth ring is adopted. And a sealing ring is arranged in the groove of the labyrinth ring. Chinese patent 201210432617.1 reports "a labyrinth seal structure and mounting method", which includes a seal mounting hole and a shaft, wherein a seal is disposed in the seal mounting hole, and the seal and the shaft form a labyrinth seal. The labyrinth seal is that several ring seal teeth are arranged around the rotating shaft, a series of cut-off gaps and expansion cavities are formed between teeth, and the sealed medium produces throttling effect when passing through the gaps of the zigzag labyrinth, so as to achieve the purpose of leakage resistance.

Disclosure of Invention

The invention aims to provide a labyrinth seal structure for a compressor, which aims to reduce the leakage amount and improve the sealing effect of the compressor. The invention is characterized in that a plurality of annular sealing teeth are arranged in sequence around the rotating shaft, a series of labyrinth type intercepting gaps and expansion cavities are formed between the teeth, and the sealed medium generates throttling effect when passing through the gaps of the labyrinth to achieve the purpose of leakage resistance.

The labyrinth seal structure of the invention, mainly by the stator group that the chassis and baffle make up, spindle, impeller and installing in the chassis and seal assembly, etc. make up between the spindle, characterized by that:

(1) sealing teeth which are arranged at intervals in sequence are arranged on the rotating shaft;

(2) a matching groove is arranged on a partition plate in the stator group, and the sealing component is directly connected with the matching groove or connected with the matching groove through a bolt handle;

(3) the height of the sealing teeth is 3.5 mm-5 mm, the distance between the teeth and the tooth central line is 4 mm-5 mm, and the included angle between the two sealing teeth is 30 degrees;

(4) the structural style of impeller mouth circle department seal tooth is different, and sealed position also can be different with the sealed number of teeth, generally at 4 ~ 25 teeth.

The labyrinth seal structure of the present invention has integral structure, teeth arranged in equal interval and easy manufacture, and has great straight-through effect.

The labyrinth seal structure of the invention, the said staggered labyrinth seal, the protruding height of the seal tooth is different, the high and low tooth is arranged alternatively, the shaft surface is the purpose-made concave-convex groove, the structure that the high and low tooth is matched with the concave-convex groove, the smooth seal clearance is changed into the zigzag type, the flow resistance is increased, and the sealing performance is improved.

The labyrinth seal structure of the invention, the step labyrinth seal, the structure changes in radial dimension, the fall between the former tooth top and the latter tooth top is 1 mm.

According to the labyrinth seal structure, the seal tooth sheet is made of LD10 aluminum, ZL104 aluminum or 5083 low-temperature aluminum according to different working conditions.

Drawings

FIG. 1 is a cross-sectional view of a labyrinth seal of the present invention;

FIG. 2 is a transverse view of a smooth labyrinth seal tooth of the present invention;

FIG. 3 is a transverse view of a labyrinth seal tooth of the present invention;

FIG. 4 is a transverse view of a stepped labyrinth seal tooth of the present invention.

In the figures, the sealing device comprises a main shaft 1, a sealing assembly 2, a partition plate 3, smooth sealing teeth 4, staggered sealing teeth 5 and stepped sealing teeth 6.

Detailed Description

The labyrinth seal structure of the present invention will be further described and supplemented with reference to the accompanying drawings.

Machining a main shaft 1 in sequence according to the parts marked by the figures; the sealing assembly 2 and the partition plate 3, the sealing teeth of the sealing assembly have three different structural forms respectively, namely smooth sealing teeth 4 respectively; a staggered seal tooth 5 and a stepped seal tooth 6.

The following examples are given to illustrate their typical structural parameters:

example 1

The smooth type labyrinth seal of this embodiment 1 adopts overall structure, and tooth equidistant range, sealed tooth height 3.5mm, tooth and tooth central line interval 4mm, the contained angle between two sealed teeth is 30 degrees, and LD10 aluminium is selected for use to the material for the interstage seal around the impeller can select for use 4 teeth.

Example 2

The ragged labyrinth seal of the embodiment 2 has different extending heights of the seal teeth, the high and low teeth are arranged alternately, the height of the seal teeth is 4mm, the distance between the teeth and the central line of the teeth is 4.5mm, the included angle between the two seal teeth is 30 degrees, the shaft surface is a specially-made concave-convex groove, and the high and low teeth and the concave-convex groove are matched with each other to form a smooth seal gap, so that the flow resistance is increased, the sealing performance is improved, 5083 low-temperature aluminum material is selected for use as the material of an ethylene compressor, and the high and low teeth and the concave-convex groove are used for the front and rear interstage seal of an impeller and can.

Example 3

The step labyrinth seal of this embodiment 3, the structure changes on radial dimension, and the drop between preceding addendum and the back addendum is 1mm, and sealed tooth height 5mm, tooth and tooth central line interval 5mm, the contained angle between two sealed teeth is 30 degrees, and ZL104 aluminium is selected for use to the material for the axle head is sealed, can select for use 25 teeth.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and it will be apparent to those skilled in the art that various changes and modifications can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.