CN216666029U - Blade top clearance optimization structure for high-speed centrifugal compressor - Google Patents

Abstract

The utility model discloses a blade top clearance optimization structure for a high-speed centrifugal compressor, and relates to the technical field of centrifugal compressors. The utility model includes a centrifugal compressor volute; a high-speed centrifugal compression impeller, a guide vane and an air inlet diffuser are fixedly arranged on the centrifugal compressor volute; a blade top gap is arranged between the air inlet diffuser and the high-speed centrifugal compression impeller, and the air inlet diffuser and the high-speed centrifugal compression impeller are consistent in revolution surface and same in gap; the height of the high-speed centrifugal compression impeller is equal to the height of the guide vanes. The rotating surfaces of the air inlet diffuser and the high-speed centrifugal compression impeller are kept consistent, and the blade top gaps are the same; the high-speed centrifugal compression impeller and the guide vane have the same blade height; the blade top clearance and the clearance above the guide vane can be effectively ensured to be relatively uniform; the method has the advantages of slowing down the influence of cold and thermal expansion and reducing the possibility of causing larger abrasion and larger damage of the impeller.

Description

Blade top clearance optimization structure for high-speed centrifugal compressor

Technical Field

The utility model belongs to the technical field of centrifugal compressors, and particularly relates to a blade top clearance optimization structure for a high-speed centrifugal compressor.

Background

The air compressor has wide application in industrial and agricultural production, and is particularly widely applied to various industries such as buildings, metallurgy, textile, chemical industry, electronics, plastics, food, military industry and the like. It can be mainly divided into two types, a displacement compressor and a speed type centrifugal compressor. Depending on whether the compressed air contains oil or not, it can be classified into oil-containing centrifugal compressors and oil-free centrifugal compressors.

When the centrifugal compressor runs at a high speed, a certain degree of clearance needs to be reserved between the impeller and the shell of the centrifugal compressor, so that the impeller rotating at the high speed is prevented from being damaged due to contact or collision with the inner surface (rotary surface) of the inlet air inlet diffuser; therefore, the gap between the impeller and the inlet intake diffuser needs to be kept uniform, and the parts such as the impeller and the inlet intake diffuser are influenced by cold and hot expansion to a certain extent; resulting in equipment life and property damage.

Among them, the chinese patent "air cooling structure of a two-stage centrifugal compressor" discloses the number: CN 112922906A; the cooling compressed gas is led out from the middle pipeline and enters the cold air inlet through the air cooling gas distributing pipe, the cooling compressed gas uniformly enters the inner cavity of the shell through the air inlet holes in the air inlet air-homogenizing cover, the cooling air passes through the gap between the motor stator and the shell and the main shaft and is uniformly discharged from the air inlet holes in the air outlet air-homogenizing cover on the other side, and the discharged gas is discharged from the cold air outlet. Through setting up even wind device at casing both ends, with the even guide circulation in the casing of cooling air, discharge from both ends air conditioning gas outlet again, guaranteed cooling air inside the casing equilibrium all the time and distributed, do not have the not good enough problem of local area cooling effect, through middle pipeline with partial compressed gas introduction casing in realize the cooling to motor, main shaft, journal bearing and axial bearing, improve centrifugal compressor's life.

The above patent only improves the service life of the centrifugal compressor by cooling the motor, the main shaft, the radial bearing and the axial bearing; the effect that the gap between the impeller and the air inlet diffuser needs to be kept uniform cannot be achieved, and the problems that the impeller is abraded greatly and even damaged greatly due to the fact that parts such as the impeller and the air inlet diffuser are deformed unevenly or deformed greatly when the parts are influenced by cold and hot expansion cannot be solved; therefore, the utility model designs a blade top clearance optimizing structure for a high-speed centrifugal compressor.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a blade top clearance optimization structure for a high-speed centrifugal compressor, which is characterized in that the rotation surfaces of an air inlet diffuser and a high-speed centrifugal compressor impeller are kept consistent, and the blade top clearances are the same; the high-speed centrifugal compression impeller and the guide vane have the same blade height; the blade top clearance and the guide vane upper clearance can be effectively ensured to be relatively uniform, and the problem that the impeller is greatly abraded and even greatly damaged due to uneven deformation degree or large deformation degree existing when the blade is influenced by cold and thermal expansion is solved.

In order to solve the technical problems, the utility model is realized by the following technical scheme:

the utility model relates to a blade top clearance optimization structure for a high-speed centrifugal compressor, which comprises a centrifugal compressor volute, a high-speed centrifugal compression impeller, a guide vane and an air inlet diffuser; the centrifugal compressor volute is fixedly provided with a high-speed centrifugal compression impeller, a guide vane and an air inlet diffuser; a blade top gap is formed between the inner surface of the bottom of the air inlet diffuser and the top of the high-speed centrifugal compression impeller, and the inner surface of the bottom of the air inlet diffuser and the revolution surface of the top of the high-speed centrifugal compression impeller are consistent and have the same gap; the radian of the inner wall of the air inlet diffuser and the radian of the top of the impeller are kept consistent and the clearance is the same; the centrifugal compressor aims to ensure that the clearance between the impeller and the shell of the centrifugal compressor is kept uniform as much as possible, so that the fit clearance can be accurately ensured, the leakage loss is reduced, and the operation efficiency is improved; and the service life of the equipment is prolonged, and the operating economic benefit is improved.

Further, the device also comprises a high-speed motor; and a high-speed centrifugal compression impeller is fixedly arranged on an output shaft of the high-speed motor.

Furthermore, a gasket for adjusting the gap is arranged between the bottom of the guide vane and a connecting flange of the high-speed motor and used for adjusting the height center line of the impeller at the outlet of the high-speed centrifugal compression impeller to be consistent with the height center line of the blades of the guide vane; the gasket aims to improve the accuracy of the fit of the central line, reduce fluid impact, reduce loss and ensure operation efficiency.

Furthermore, the gasket adopts the copper sheet gasket, the copper sheet gasket has the advantage that the degree of deformation of the cooled thermal expansion is relatively small.

Furthermore, an isolation layer which is not easy to deform due to cold and thermal expansion is arranged on the inner wall of the air inlet diffuser; the isolating layer is made of graphite materials.

Further, an air inlet and an air outlet are arranged on the high-speed centrifugal compressor shell; and the gas outlet is fixedly communicated with a gas connecting pipe.

The utility model has the following beneficial effects:

the utility model achieves the purpose that the blade top gap between the air inlet diffuser and the high-speed centrifugal compression impeller is easy to accurately adjust and the purpose that the height center line of the outlet blade of the high-speed centrifugal compression impeller is consistent with the height center line of the guide vane blade by increasing and decreasing the gaskets at the connecting part of the air inlet diffuser and the centrifugal compressor volute; the method has the advantages of greatly reducing leakage loss and impact loss and greatly improving the operating efficiency and stability of the system.

Of course, it is not necessary for any product in which the utility model is practiced to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a sectional view showing the internal structure of a tip clearance optimizing structure for a high-speed centrifugal compressor according to one embodiment of the present invention;

FIG. 2 is a sectional view showing the inner structure of a tip clearance optimizing structure for a high-speed centrifugal compressor according to a third embodiment of the present invention;

FIG. 3 is a cross-sectional view of the inner surface of the inlet diffuser and the inner structure of the isolating layer and the impeller of the high-speed centrifugal compressor;

FIG. 4 is a schematic view of an optimized tip clearance configuration for a high speed centrifugal compressor in accordance with the present invention;

in the drawings, the components represented by the respective reference numerals are listed below:

the method comprises the steps of 1-high-speed centrifugal compressor volute, 2-high-speed centrifugal compressor impeller, 3-guide vane, 4-inlet diffuser, 101-blade top gap, 102-isolation layer and 201-gap adjusting gasket.

Detailed Description

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.

In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced component or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.

Example one

Referring to fig. 1 and 4, the present invention is a blade tip clearance optimizing structure for a high-speed centrifugal compressor, including a centrifugal compressor volute 1, a high-speed centrifugal compressor impeller 2, a guide vane 3 and an inlet diffuser 4. The air inlet diffuser 4 is matched with the high-speed centrifugal compression impeller 2 to form a blade top gap 101, and the radians of the inner wall of the blade top gap 101 and the top of the high-speed centrifugal compression impeller 2 are kept consistent and the gaps are the same; the center line of the blade height of the outlet blade of the high-speed centrifugal compression impeller 2 is consistent with the height center line of the blade height of the guide vane 3. Among other things, the tip clearance 101 has a significant effect on high speed centrifugal compressor leakage losses. The center line of the blade height of the outlet blade of the high-speed centrifugal compression impeller 2 is consistent with the height center line of the blade height of the guide blade 3, so that the impact loss of airflow can be effectively reduced, the efficiency is improved, and the economic benefit in the production process is improved.

Example two

Referring to fig. 1 and 4, the present invention is a blade tip clearance optimizing structure for a high-speed centrifugal compressor, including a volute 1 of the high-speed centrifugal compressor, a high-speed centrifugal compressor impeller 2, a guide vane 3 and an inlet diffuser 4. The blade top gap 101 is formed between the air inlet diffuser 4 and the high-speed centrifugal compression impeller 2 in a matched mode, and the radian of the inner wall of the blade top gap 101 is kept consistent with that of the top of the high-speed centrifugal compression impeller 2 and the gap is the same; the center line of the blade height of the outlet blade of the high-speed centrifugal compression impeller 2 is consistent with the height center line of the blade height of the guide vane 3. The volute 1 of the centrifugal compressor of the high-speed centrifugal compressor is provided with an air inlet and an air outlet; the gas outlet is fixedly communicated with a gas connecting pipe.

EXAMPLE III

More preferably, on the basis of the second embodiment, please refer to fig. 2 and 4, the utility model is a blade tip clearance optimizing structure for a high-speed centrifugal compressor, further comprising a high-speed motor; the output shaft of the high-speed motor is fixedly provided with a high-speed centrifugal compression impeller 2; a gasket 201 for adjusting the height of the high-speed centrifugal compression impeller 2 is arranged between the output shaft of the high-speed motor and the bottom surface of the high-speed centrifugal compression impeller 2; the purpose of the gasket 201 is to make it possible to better match the inside of the inlet diffuser 4 with the camber adjustment of the top of the high-speed centrifugal compressor impeller 2, to better adjust the tip clearance, and to improve the uniformity and accuracy of the fit of the clearance.

Example four

More preferably, the gasket 201 is a copper gasket, and the copper gasket has the advantage of relatively low thermal expansion deformation under cooling.

EXAMPLE five

More preferably, on the basis of the fourth embodiment, as shown in fig. 3 and 4, an isolation layer 102 that is not easily deformed by cold and thermal expansion is disposed on the inner wall of the tip clearance 101; the isolation layer 102 is made of graphite material.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the utility model disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the utility model to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best utilize the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims (7)

1. A blade top clearance optimization structure for a high-speed centrifugal compressor comprises a centrifugal compressor volute (1), a high-speed centrifugal compression impeller (2), a guide vane (3) and an air inlet diffuser (4); the method is characterized in that:

a high-speed centrifugal compression impeller (2), a guide vane (3) and an air inlet diffuser (4) are fixedly arranged on the centrifugal compressor volute (1) respectively;

a blade top gap (101) is formed between the inner surface of the bottom of the air inlet diffuser (4) and the top of the high-speed centrifugal compression impeller (2), and the inner surface of the bottom of the air inlet diffuser (4) is consistent with the revolution surface of the top of the high-speed centrifugal compression impeller (2) and has the same gap;

the height of the blades at the outlet end part of the high-speed centrifugal compression impeller (2) is equal to that of the blades of the guide vanes (3).

2. The tip clearance optimizing structure for a high-speed centrifugal compressor according to claim 1, further comprising a high-speed motor; and an output shaft of the high-speed motor is fixedly installed with the high-speed centrifugal compression impeller (2).

3. The structure for optimizing the clearance at the top of the blade for the high-speed centrifugal compressor is characterized in that a clearance adjusting shim (201) is arranged between the high-speed motor and the connecting flange surface of the high-speed centrifugal compressor impeller (2) and is used for adjusting the height center line of the blade at the outlet of the high-speed centrifugal compressor impeller (2) to be consistent with the height center line of the blade of the guide vane (3).

4. The tip clearance optimizing structure for a high-speed centrifugal compressor according to claim 3, wherein the shim (201) is a copper sheet shim.

5. The blade tip clearance optimizing structure for the high-speed centrifugal compressor as claimed in claim 1, wherein the inner top wall of the inlet diffuser (4) is provided with an isolating layer (102) which is not easy to deform due to cold and thermal expansion and has low material hardness.

6. The tip clearance optimizing structure for a high-speed centrifugal compressor according to claim 5, wherein the isolating layer (102) is made of a graphite material.

7. The tip clearance optimizing structure for a high-speed centrifugal compressor according to claim 1, wherein the high-speed centrifugal compressor volute (1) is provided with an air inlet and an air outlet; and the gas outlet is fixedly communicated with a gas connecting pipe.

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