阅读说明：本技术 一种磁悬浮空气压缩机防止喘振的结构 (Surging prevention structure of magnetic suspension air compressor ) 是由 林英哲 刘淑云 吴立华 董继勇 于 2019-12-13 设计创作，主要内容包括：本发明公开了一种磁悬浮空气压缩机防止喘振的结构,包括蜗壳、进气道、叶轮、端盖、限位块、位移传感器、连接压缩机出气管道的第一进气口和第二进气口；其中,蜗壳内径与进气道外径滑动配合,进气道中设置有位移传感器,蜗壳上设置有端盖,蜗壳上设置有第一进气口,端盖上设置有限位块,端盖上设置有第二进气口,当第一进气口通入压力空气时,进气道在压力空气作用下上升,此时进气道与叶轮间隙最大,当第二进气口通入压力空气时,进气道在压力空气作用下下降,此时进气道与叶轮间隙最小。本发明通过调整进气口的进气方向和进气量,从而影响压缩机进气道与叶轮叶片之间的间隙大小,能够有效、方便的控制喘振。(The invention discloses a magnetic suspension air compressor surge prevention structure, which comprises a volute, an air inlet channel, an impeller, an end cover, a limiting block, a displacement sensor, a first air inlet and a second air inlet, wherein the first air inlet and the second air inlet are connected with an air outlet pipeline of a compressor; the volute is provided with a first air inlet, the end cover is provided with a limiting block, the end cover is provided with a second air inlet, when the first air inlet leads in pressure air, the air inlet rises under the action of the pressure air, at the moment, the air inlet is the largest in clearance with an impeller, when the second air inlet leads in the pressure air, the air inlet descends under the action of the pressure air, and at the moment, the air inlet is the smallest in clearance with the impeller. The invention influences the size of the gap between the air inlet channel of the compressor and the impeller blade by adjusting the air inlet direction and the air inlet amount of the air inlet, and can effectively and conveniently control surge.)

1. A magnetic suspension air compressor surge prevention structure is characterized by comprising a volute (1), an air inlet channel (2), an impeller (3), an end cover (4), a limiting block (5), a displacement sensor (6), a first air inlet (9) and a second air inlet (10), wherein the first air inlet and the second air inlet are connected with an air outlet pipeline of the compressor; the device comprises a volute (1), an air inlet channel (2), a displacement sensor (6), an end cover (4), a first air inlet (9), a limiting block (5) and a second air inlet (10), wherein the inner diameter of the volute (1) is in sliding fit with the outer diameter of the air inlet channel (2), the displacement sensor is arranged in the air inlet channel (2), the end cover (4) is arranged on the volute (1), the first air inlet (9) is arranged on the volute (1), and the limiting block (5) is arranged on the end.

2. The magnetic suspension air compressor surge prevention structure as claimed in claim 1, wherein the limiting block (5) is arranged at the contact surface of the air inlet channel (2) and the end cover (4) and can limit the rising height of the air inlet channel (2).

3. The magnetic suspension air compressor surge preventing structure according to claim 1, wherein the volute (1) and the end cover (4) are fixed by screws, and the end cover (4) and the limiting block (5) are fixed by screws.

4. The magnetic suspension air compressor surge prevention structure according to claim 1, wherein the contact surfaces between the volute (1) and the inlet channel (2), between the volute (1) and the end cover (4), and between the inlet channel (2) and the end cover (4) are sealed by sealing rings.

5. The magnetic suspension air compressor surge prevention structure according to claim 1, characterized in that when the first air inlet (9) is filled with compressed air, the air inlet (2) rises under the action of the compressed air and rises to the highest position (14) of the air inlet when contacting with the limited block (5), and the air inlet and the impeller gap (8) are maximum.

6. The structure for preventing surging of a magnetic suspension air compressor as claimed in claim 1, characterized in that when the second air inlet (10) is fed with compressed air, the air inlet (2) descends under the action of the compressed air and falls to the lowest position (13) of the air inlet when falling on the end face of the volute (1), and the air inlet and impeller clearance (8) is minimum.

Technical Field

The invention belongs to the field of compressors, and particularly relates to a surge prevention structure of a magnetic suspension air compressor.

Background

Surge is an abnormal condition of vibration of a turbine compressor (also called a vane compressor) that occurs when the flow rate is reduced to a certain extent. When the rotating speed is constant, the feeding of the compressor is reduced to a certain value, so that the speed of gas in the blade channel is uneven and backflow occurs, when the phenomenon is expanded to the whole blade channel, the gas in the blade channel cannot flow out, so that the pressure in the compressor stage is suddenly reduced, the gas flow is reversely pressed back into the stage by the relatively high pressure after the stage, the pressure in the stage is recovered to be normal, the impeller also works to be normal, and the gas flow reversely flowing back is pressed out again. Thereafter, the pressure in the stage drops suddenly and the flow reverses again, which is repeated and the compressor operates unstably, which becomes a surge.

When the compressor surges, the typical phenomena are as follows:

(1) the outlet pressure of the compressor is firstly increased and then sharply decreased, and fluctuates periodically and greatly;

(2) the flow of the compressor is sharply reduced and greatly fluctuates, and even air flows backwards to the air suction pipeline in serious cases;

(3) the current and power meter indication of a motor for dragging the compressor are unstable and fluctuate greatly;

(4) the machine generates strong vibrations, while emitting unusual airflow noise.

Short-term surge does not have much effect on the compressor other than changing the magnitude of thrust. However, long term surge can accelerate fatigue of the compressor internals and rapidly propagate existing cracks, which can lead to irreparable engine damage and even explosion.

Currently, there are three common methods for solving surge:

(1) an air bleeding valve is added on the air compressor, so that redundant air can be discharged;

(2) using a two-rotor or three-rotor compressor;

(3) using adjustable blades.

Disclosure of Invention

The purpose of the invention is as follows: aiming at the problem of surge of a blade type compressor in the prior art, the invention discloses a novel structure for preventing surge of a magnetic suspension air compressor.

The technical scheme is as follows: the invention adopts the following technical scheme: a magnetic suspension air compressor surge prevention structure comprises a volute, an air inlet channel, an impeller, an end cover, a limiting block, a displacement sensor, a first air inlet and a second air inlet, wherein the first air inlet and the second air inlet are connected with an air outlet pipeline of the compressor; the volute is characterized in that the inner diameter of the volute is in sliding fit with the outer diameter of the air inlet channel, a displacement sensor is arranged in the air inlet channel, an end cover is arranged on the volute, a first air inlet is formed in the volute, a limiting block is arranged on the end cover, and a second air inlet is formed in the end cover.

Preferably, the limiting block is arranged on the contact surface of the air inlet channel and the end cover, and can limit the rising height of the air inlet channel.

Preferably, the volute and the end cover are fixed through screws, and the end cover and the limiting block are fixed through screws.

Preferably, the contact surfaces between the volute and the air inlet channel, between the volute and the end cover and between the air inlet channel and the end cover are sealed by sealing rings.

Preferably, when the first air inlet is filled with pressure air, the air inlet channel rises under the action of the pressure air and rises to the highest position of the air inlet channel when contacting with the limiting block, and the clearance between the air inlet channel and the impeller is the largest at the moment.

Preferably, when the second air inlet is filled with the pressure air, the air inlet channel descends under the action of the pressure air, and descends to the lowest position of the air inlet channel when the air inlet channel falls on the end face of the volute, and the clearance between the air inlet channel and the impeller is minimum.

Has the advantages that: the invention has the following beneficial effects:

(1) the invention influences the size of the gap between the air inlet channel of the compressor and the impeller by adjusting the air inlet direction and the air inlet amount of the air inlet, and adjusts the air leakage amount, thereby effectively and conveniently controlling surge;

(2) on the basis of the original compressor, only two air inlets, a displacement sensor, an end cover and a limiting block are needed to be added, the original structure is not greatly changed, and the compressor is easy to install and implement.

Drawings

FIG. 1 is a schematic structural view of the present invention in which the clearance between the air intake duct and the impeller is minimized;

FIG. 2 is an enlarged schematic view of the structure at the position A when the clearance between the air inlet and the impeller is maximum according to the present invention;

the device comprises a volute 1, an air inlet channel 2, an impeller 3, an end cover 4, a limiting block 5, a displacement sensor 6, an air inlet channel and impeller gap 8, a first air inlet 9, a second air inlet 10, a rotor 12, an air inlet channel lowest position 13 and an air inlet channel highest position 14.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

The size that compressor intake duct and 8 size influences admits air of impeller clearance: the large clearance has large leakage amount, the small clearance has small leakage amount, and the leakage amount influences the air inflow, so that the invention adjusts the size of the clearance 8 between the air inlet passage of the compressor and the impeller by adjusting the air inlet direction and the air inflow of the air inlet, thereby controlling the surge of the system.

The invention discloses a magnetic suspension air compressor surge prevention structure, which comprises a volute 1, an air inlet channel 2, an impeller 3, an end cover 4, a limiting block 5, a displacement sensor 6, a first air inlet 9 and a second air inlet 10, wherein the first air inlet and the second air inlet are connected with an air outlet pipeline of the compressor, as shown in figure 1.

Wherein, 1 internal diameter of spiral case and 2 external diameter sliding fit in intake duct, be provided with displacement sensor 6 in the intake duct 2, displacement sensor 6 detects the position of intake duct 2, connect end cover 4 through the screw on the spiral case 1, be provided with first air inlet 9 on the spiral case 1, pass through bolted connection stopper 5 on the end cover 4, stopper 5 sets up in the contact surface department of intake duct 2 and end cover 4, can restrict the height that the intake duct rises, be provided with second air inlet 10 on the end cover 4, spiral case 1 and intake duct 2, spiral case 1 and end cover 4, the contact surface between intake duct 2 and the end cover 4 is sealed with the sealing washer.

The position of the inlet 2 can be adjusted between an inlet lowest position 13 and an inlet highest position 14.

As shown in figure 2, the distance between the bottom surfaces of the air inlet channel 2 and the limiting block 5 is one end, when the first air inlet 9 is filled with the pressure air, the air inlet channel 2 rises under the action of the pressure air, rises to the highest position 14 of the air inlet channel when contacting with the limiting block 5, and then does not rise any more, and the air inlet channel and the impeller are maximum in clearance 8 at the moment.

As shown in fig. 1, the distance between the air inlet channel 2 and the end surface of the volute 1 is one end, when the second air inlet 10 introduces the compressed air, the air inlet channel 2 descends under the action of the compressed air, and descends to the lowest position 13 of the air inlet channel when falling on the end surface of the volute 1, the end surface of the volute 1 limits the position of the air inlet channel, and then the air inlet channel does not descend, and the air inlet channel and the impeller clearance 8 are minimum at the moment.

The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.