CN219139405U - Labyrinth seal of oxygen-enriched air high-speed centrifugal compressor - Google Patents

Abstract

The utility model provides labyrinth seal of an oxygen-enriched air high-speed centrifugal compressor, relates to the technical field of air seal of centrifugal compressors, and aims to solve the problem that the sealing performance of an existing sealing structure for the centrifugal compressor is poor in the actual working process, and the normal working of the centrifugal compressor is affected. The sealing device comprises a cover, a diffuser is arranged on the right side of the cover, a seal is arranged between the cover and the diffuser, the seal consists of a flange plate and a sealing main body, the flange plate and the sealing main body are integrated, nitrogen charging holes are uniformly distributed on the side wall of the sealing main body, nitrogen discharging holes are formed in the lower end face of the sealing main body, a nitrogen charging pipeline and a nitrogen discharging pipeline are arranged in the sealing device, the charging pressure of the nitrogen charging pipeline and the nitrogen discharging pipeline is greater than 0.15MPa, the pressure provided by a sealing system is higher than that of an inlet gas, and the pressure difference is key for achieving good sealing effect in the sealing.

Description

Labyrinth seal of oxygen-enriched air high-speed centrifugal compressor

Technical Field

The utility model relates to the technical field of air sealing of centrifugal compressors, in particular to a labyrinth seal of an oxygen-enriched air high-speed centrifugal compressor.

Background

A centrifugal compressor is a rotary machine. Under the action of the high-speed rotating impeller, the medium gas obtains speed energy and pressure energy, and the speed energy is further converted into the pressure energy through the action of the diffuser, so that the gas pressure is increased. Centrifugal compressors are of 4 types according to structural characteristics and can be divided into horizontal split type, vertical split type, isothermal compression type and combined type.

Several sealing techniques are currently in common use: labyrinth seal, floating ring seal, mechanical seal, and dry gas seal. The dry gas seal has higher cost, the sealing performance of the common labyrinth seal is poor, and the floating ring clearance close to the inner side of the floating ring seal is smaller, so that the temperature of the floating ring at the inner side is higher. Because the medium gas is oxygen-enriched air, the oxygen-enriched air is inflammable and explosive gas, and electric sparks are not easy to rub and are generated on the selection of sealing materials, and the risk of safety accidents is reduced, the labyrinth seal of the oxygen-enriched air high-speed centrifugal compressor is designed and is particularly important for solving the problem of poor sealing performance of the conventional sealing mechanism.

Disclosure of Invention

The utility model aims to solve the problem that the sealing structure for the centrifugal compressor has poor sealing performance in the actual working process and influences the normal working of the centrifugal compressor in the prior art, and provides the labyrinth seal of the oxygen-enriched air high-speed centrifugal compressor.

In order to achieve the above purpose, the present utility model adopts the following technical scheme: the utility model provides an oxygen boosting air high-speed centrifugal compressor's labyrinth seal, includes the cover, the diffuser is installed on the right side of cover, the cover with install sealedly between the diffuser, sealedly by ring flange and sealed main part constitution, the ring flange with sealed main part is as an organic whole, the equipartition has the nitrogen filling gas pocket on sealed main part's the lateral wall, be provided with the nitrogen vent on sealed main part's the lower terminal surface, sealed main part's inner wall is provided with left broach and right broach, left broach and right broach all multiunit distribute on sealed main part's inner wall, the nitrogen filling gas pocket with be linked together in sealed main part's the inner chamber, left broach is located the left side of nitrogen filling hole, right broach sets up the right side at the nitrogen filling gas pocket.

Preferably, the seal is formed by copper-nickel-zinc alloy processing, the nitrogen charging hole is connected with a nitrogen charging pipeline, and the nitrogen discharging hole is connected with a nitrogen discharging pipeline.

Preferably, the inflation pressure in the nitrogen charging pipeline and the nitrogen discharging pipeline is greater than 0.15MPa, and the pressure provided in the seal is higher than the pressure in the nitrogen charging pipeline.

Preferably, the direction of the left comb teeth is opposite to the direction of the right comb teeth.

Preferably, the outer wall of the sealing main body is embedded with fluorine rubber rings, and the fluorine rubber rings are distributed on the outer side wall of the sealing main body in a plurality of groups.

Compared with the prior art, the utility model has the advantages and positive effects that,

1. in the utility model, in use, the seal is provided with the nitrogen charging pipeline and the nitrogen discharging pipeline, the charging pressure is more than 0.15MPa, the pressure provided by the seal system is higher than the pressure at the inlet gas, the pressure difference is the key of achieving good seal effect in the seal, leaked nitrogen is collected through the special discharging pipeline, a large amount of nitrogen is prevented from being directly discharged into the air, the nitrogen content in the air is high, the sucked oxygen partial pressure is reduced, the oxygen deficiency of on-site staff is caused, and the problem that the sealing performance of the seal structure for the centrifugal compressor is poor in the actual working process and the normal working of the centrifugal compressor is influenced is solved.

2. In the utility model, after nitrogen enters the seal through the nitrogen charging hole, the directions of the comb teeth at the two sides of the nitrogen charging hole are opposite, the effect of preventing oxygen-enriched air from entering the seal can be improved at the left side, the effect of preventing air in the working environment from entering the seal can be improved at the right side, and compared with the conventional seal, the sealing performance of the centrifugal compressor is greatly improved, thereby further improving the working effect of the centrifugal compressor and reducing the maintenance cost.

Drawings

FIG. 1 is an overall view of the seal of the present utility model;

FIG. 2 is a cross-sectional view of the seal of the present utility model;

FIG. 3 is an overall view of a labyrinth seal of an oxygen enriched air high speed centrifugal compressor of the present utility model;

fig. 4 is a sectional view in the direction B-B of fig. 3.

Legend description: 1. a cover; 2. a diffuser; 3. sealing; 301. a flange plate; 302. a sealing body; 303. nitrogen filling pores; 304. nitrogen vent holes; 305. left comb teeth; 306. right comb teeth; 4. and a fluorine rubber ring.

Detailed Description

In order that the above objects, features and advantages of the utility model will be more clearly understood, a further description of the utility model will be rendered by reference to the appended drawings and examples. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, however, the present utility model may be practiced otherwise than as described herein, and therefore the present utility model is not limited to the specific embodiments of the disclosure that follow.

The utility model provides a labyrinth seal of an oxygen-enriched air high-speed centrifugal compressor, which comprises a cover 1, wherein a diffuser 2 is arranged on the right side of the cover 1, a seal 3 is arranged between the cover 1 and the diffuser 2, the seal 3 is formed by copper-nickel-zinc combination, the seal 3 can be effectively prevented from generating sparks by friction with a shaft, the safety coefficient is high, the seal 3 consists of a flange 301 and a seal main body 302, the flange 301 and the seal main body 302 are integrated, the arrangement of the flange 301 is favorable for installing the seal 3 on the cover 1, nitrogen charging holes 303 are uniformly distributed on the side wall of the seal main body 302, nitrogen discharging holes 304 are arranged on the lower end surface of the seal main body 302, the nitrogen charging hole 303 is connected with a nitrogen charging pipeline, the nitrogen discharging hole 304 is connected with a nitrogen discharging pipeline, the inner wall of the sealing main body 302 is provided with left comb teeth 305 and right comb teeth 306, the left comb teeth 305 and the right comb teeth 306 are distributed on the inner wall of the sealing main body 302 in groups, the nitrogen charging hole 303 is communicated with the inner cavity of the sealing main body 302, the left comb teeth 305 are positioned at the left side of the nitrogen charging hole 303, the right comb teeth 306 are arranged at the right side of the nitrogen charging hole 303, the direction of the left comb teeth 305 is opposite to the direction of the right comb teeth 306, the left side can improve the effect of preventing oxygen-enriched air from entering the sealing 3, the right side can improve the effect of preventing air of the working environment from entering the sealing 3,

the sealing 3 is made of copper-nickel-zinc alloy, spark generated by friction between the sealing 3 and a shaft can be effectively prevented, the safety coefficient is high, the sealing 3 is provided with a nitrogen charging pipeline and a nitrogen discharging pipeline, the charging pressure is greater than 0.15MPa, the pressure provided by a sealing 3 system is higher than that of an inlet gas, the pressure difference is the key of achieving a good sealing 3 effect of the sealing 3, leaked nitrogen is collected through a special discharging pipeline, a large amount of nitrogen is prevented from being directly discharged into the air, the nitrogen content in the air is high, the partial pressure of inhaled oxygen is reduced, the oxygen deficiency of on-site workers is caused, after the nitrogen enters the sealing 3 through a nitrogen charging hole 303, the directions of two sides of comb teeth at the nitrogen charging hole are opposite, the effect of preventing oxygen-enriched air from entering the sealing 3 can be improved on the left side, the air entering the sealing 3 of the working environment can be improved on the right side, compared with the sealing 3 of the conventional sealing 3, the working effect of the centrifugal compressor is greatly improved, and the maintenance cost is reduced.

Example 1

As shown in fig. 1-4, the inflation pressure in the nitrogen filling pipeline and the nitrogen discharging pipeline is greater than 0.15MPa, the pressure provided in the seal 3 is higher than the pressure in the nitrogen filling pipeline, the outer wall of the main body of the seal 3 is embedded with fluorine rubber rings 4, the fluorine rubber rings 4 are distributed on the outer side wall of the main body 302 in a plurality of groups,

the effect that its whole embodiment 1 reaches is, in use, through this seal 3 is furnished with nitrogen filling pipeline and nitrogen exhaust pipeline, and its inflation pressure is greater than 0.15MPa, and the pressure that the seal 3 system provided is higher than the pressure of inlet gas department, and pressure differential is the key that seal 3 obtained good seal 3 effect, and nitrogen filling pipeline and nitrogen exhaust pipeline all adopt external pipeline design, so do not annotate in the figure, through the setting of fluorine rubber ring 4, make seal 3 and diffuser 2's seam department be in relatively stable state.

Working principle: this seal is furnished with nitrogen filling pipeline and nitrogen exhaust pipeline, communicate corresponding nitrogen filling gas pocket and nitrogen exhaust gas pocket, its inflation pressure is greater than 0.15MPa, the pressure that sealing system provided is higher than the pressure of entry gas department, the pressure differential is sealed key that obtains good sealed effect, collect nitrogen through special exhaust pipeline to revealing, prevent that a large amount of nitrogen from directly discharging into the air, lead to the nitrogen content in the air higher, make the oxygen partial pressure of inhalant drop, lead to on-the-spot staff's oxygen deficiency choking, nitrogen is got into sealed back by nitrogen filling hole, the direction of the both sides broach of nitrogen filling hole position department is opposite, the left side can improve the effect of preventing oxygen-enriched air entering seal, the right side can improve the effect of preventing that operational environment's air from getting into seal, through nitrogen filling pipeline and nitrogen exhaust pipeline and sealed in different pressure setting for there is the pressure differential between the two, sealed inside in relative sealed state has been guaranteed.

In summary, the seal is provided with the nitrogen charging pipeline and the nitrogen discharging pipeline, the charging pressure is higher than 0.15MPa, the pressure provided by the seal system is higher than the pressure at the inlet gas, the pressure difference is the key of achieving good seal effect in sealing, leaked nitrogen is collected through a special discharging pipeline, a large amount of nitrogen is prevented from being directly discharged into the air, the nitrogen content in the air is high, the sucked oxygen partial pressure is reduced, the oxygen deficiency of on-site staff is caused, after the nitrogen enters the seal through the nitrogen charging hole, the directions of comb teeth at two sides of the nitrogen charging hole are opposite, the effect of preventing oxygen-enriched air from entering the seal can be improved on the left side, the effect of preventing air in the working environment from entering the seal can be improved on the right side, compared with the conventional seal, the working effect of the centrifugal compressor is further improved, the maintenance cost is reduced, the whole seal structure adopts different conventional labyrinth structure designs, and meanwhile, the nitrogen charging pipeline and the external pipelines of the nitrogen discharging pipeline are combined, so that the work of the seal structure is relatively sealed.

Claims (5)

1. The utility model provides a labyrinth seal of oxygen boosting air high-speed centrifugal compressor, includes bonnet (1), diffuser (2) are installed on the right side of bonnet (1), bonnet (1) with install seal (3) between diffuser (2), a serial communication port, seal (3) are constituteed by ring flange (301) and seal main part (302), ring flange (301) with seal main part (302) are as an organic whole, the equipartition has nitrogen charging hole (303) on the lateral wall of seal main part (302), be provided with nitrogen vent (304) on the lower terminal surface of seal main part (302), the inner wall of seal main part (302) is provided with left broach (305) and right broach (306), all multiunit distributes on the inner wall of seal main part (302), nitrogen charging hole (303) with be linked together in the inner chamber of seal main part (302), left broach (303) are located nitrogen charging hole (305), right side (306) are in nitrogen charging hole (303).

2. The labyrinth seal of the oxygen-enriched air high-speed centrifugal compressor according to claim 1, wherein the seal (3) is formed by copper-nickel-zinc combination, the nitrogen charging air hole (303) is connected with a nitrogen charging pipeline, and the nitrogen discharging air hole (304) is connected with a nitrogen discharging pipeline.

3. Labyrinth seal for an oxygen enriched air high speed centrifugal compressor according to claim 2, wherein the charging pressure in the nitrogen charging line and the nitrogen discharging line is higher than 0.15MPa, and the pressure provided in the seal (3) is higher than the pressure in the nitrogen charging line.

4. Labyrinth seal of an oxygen enriched air high speed centrifugal compressor according to claim 1, characterized in that the direction of the left comb teeth (305) is opposite to the direction of the right comb teeth (306).

5. The labyrinth seal of the oxygen-enriched air high-speed centrifugal compressor according to claim 1, wherein a fluorine rubber ring (4) is embedded on the outer wall of the sealing main body (302), and the fluorine rubber rings (4) are distributed on the outer side wall of the sealing main body (302) in a plurality of groups.

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