A structure for preventing erosion and wear of compressor blades

Abstract

This utility model belongs to the field of centrifugal compressor manufacturing technology, and particularly relates to an anti-erosion and wear structure for compressor blades. Its key feature is that it includes ceramic fiber cloth, which is integrally bonded to the blade body surface using a silicone rubber adhesive. The ceramic fiber cloth is woven with a herringbone pattern or has a herringbone pattern hot-pressed onto the surface of the ceramic fiber felt using a mold, forming a symmetrical V-shaped groove surface similar to shark skin. Compared with existing technologies, the beneficial effects of this utility model are: by bonding a layer of ceramic fiber cloth with a shark skin-like texture to the surface of the aluminum alloy blade, the unique friction-reducing effect of the shark skin texture is utilized to reduce the erosion effect of the fluid on the impeller surface; the ceramic fiber cloth material itself has wear resistance, high temperature resistance, and corrosion resistance, which can improve the defects of the aluminum alloy material itself, extend the service life of the impeller, and ensure the long-term safe and stable operation of the centrifugal compressor.

Description

Technical Field

[0001] This utility model belongs to the field of centrifugal compressor manufacturing technology, and in particular relates to an anti-erosion and wear structure for compressor blades. Background Technology

[0002] A centrifugal compressor is a rotary turbine machine in which airflow flows primarily radially within the impeller. Its structure consists of an inlet duct, impeller, diffuser, and outlet pipe. Gas performs work as the impeller rotates, significantly increasing its pressure, velocity, and temperature. After being decelerated and diffused by the diffuser, it is discharged. Centrifugal compressors have a high single-stage pressure ratio and were initially widely used in aircraft engines, later being adapted for automotive powertrains. The automotive centrifugal compressor is a crucial component of the turbocharger; its function is to accelerate and pressurize fresh air. It consists of an inlet duct, compressor impeller, diffuser, and volute. When the compressor rotates, air within the compressor impeller is propelled outwards by centrifugal force, while a vacuum is simultaneously created at the inner center of the compressor impeller. Air is drawn in under the suction of this vacuum, passing through the inlet duct to the inner center of the compressor impeller. Air is accelerated within the impeller and ejected at high speed from the outside of the compressor impeller. The diffuser has a gradually expanding structure; as the air passes through the diffuser, its speed decreases, its pressure increases, and its temperature rises. In the diffuser, most of the air's kinetic energy is converted into pressure and a small portion into heat energy. The air continues to flow into the volute, where it is further decelerated and pressurized to meet the vehicle's air requirements. The compressor impeller is precision-cast from aluminum alloy, and the volute is also made of aluminum alloy.

[0003] Because the impeller speed in a centrifugal compressor reaches 37,500 rpm, erosion wear will occur on the impeller surface. Erosion refers to a progressive wear type caused by the impact of solid particles carried by airflow or liquid on the material surface. Erosion damage to materials can be classified into low-speed, medium-speed, and high-speed categories according to the impact velocity of the sand and dust. Past research at home and abroad has mainly focused on sand and dust erosion of metallic materials under low-speed conditions. However, when high-speed rotating blades collide with sand and dust, the relative collision velocity exceeds 300 m / s, falling into the category of high-speed erosion. Current solutions for impeller wear include: 1) Selecting wear-resistant materials. For example, high-chromium alloys and other wear-resistant materials can be used. 2) Repairing the impeller. Damaged impellers can also be repaired. Repair methods such as spraying, thermal spraying, and coating can be used to re-coat the impeller surface with a material with better wear resistance. 3) Regular maintenance. For impellers that have already shown signs of wear, regular maintenance can extend their service life. Maintenance can include regular cleaning and regular coating. It is evident that improving the erosion resistance of the impeller surface is undoubtedly of positive significance for the long-term safe and stable operation of centrifugal presses. Utility Model Content

[0004] The purpose of this invention is to provide an anti-erosion and wear structure for compressor blades, overcoming the shortcomings of existing technologies. By bonding a layer of ceramic fiber cloth with a sharkskin-like texture to the surface of the aluminum alloy blades of the compressor impeller, the unique friction-reducing effect of the sharkskin texture is utilized to reduce the erosion effect of the fluid on the impeller surface. The ceramic fiber material itself has high temperature resistance and corrosion resistance, which can overcome the defects of the aluminum alloy material itself and extend the service life of the impeller.

[0005] To achieve the above objectives, this utility model employs the following technical solution:

[0006] A erosion and wear prevention structure for compressor blades includes ceramic fiber cloth, which is bonded to the blade body surface as a whole by silicone rubber adhesive; the ceramic fiber cloth is woven with a herringbone pattern or herringbone pattern is hot-pressed onto the surface of the ceramic fiber felt using a mold to form a symmetrical V-shaped groove surface similar to shark skin.

[0007] Furthermore, the ceramic fiber cloth is woven from aluminum silicate fiber or silicon carbide fiber, with a fiber diameter of 2.0-3.0μm, a length of 100-200mm, and a cloth layer thickness of 0.5-1.2mm.

[0008] Furthermore, the specification for the silicone rubber adhesive is KN-300 silicone glue.

[0009] Furthermore, the herringbone pattern on the ceramic fiber cloth extends in the same direction as the fluid flow.

[0010] Furthermore, the width of the herringbone pattern is 2-4mm, the included angle of the symmetrically positioned V-shaped grooves is 90 degrees, and the depth of the V-shaped grooves is 0.2-0.6mm.

[0011] Furthermore, the ceramic fiber cloth is cut to conform to the shape of the compressor blades.

[0012] Furthermore, the surface of the ceramic fiber cloth is coated with a PTFE coating of 20-120 μm thickness.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] By bonding a layer of ceramic fiber cloth with a sharkskin-like texture to the surface of the aluminum alloy blades of the compressor impeller, the erosion effect of the fluid on the impeller surface can be reduced by utilizing the unique friction-reducing effect of the sharkskin texture. This sharkskin-like texture with symmetrical V-shaped grooves has the best drag reduction effect and has been verified in the application of biomimetic swimwear.

[0015] Ceramic fiber cloth material itself has wear resistance, high temperature resistance and corrosion resistance, which can improve the defects of aluminum alloy material itself, extend the service life of impeller, and ensure the long-term safe and stable operation of centrifugal press. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the compressor impeller structure according to an embodiment of the present invention;

[0017] Figure 2 This is a schematic cross-sectional view of the blade section in an embodiment of this utility model;

[0018] Figure 3 This is a schematic diagram of the herringbone pattern structure in an embodiment of this utility model;

[0019] In the diagram: 1-blade body, 2-ceramic fiber cloth, 3-silicone rubber adhesive, 4-PTFE coating, 5-herringbone pattern. Detailed Implementation

[0020] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the specific embodiments used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some embodiments of this utility model. For those skilled in the art, other specific embodiments can be obtained based on these specific embodiments without creative effort.

[0022] The components of the present invention described and shown in the specific embodiments herein can be arranged and designed in numerous different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0023] See Figure 1-3This is a schematic diagram of the compressor impeller structure according to an embodiment of the present invention. The anti-erosion and wear structure of the blades includes ceramic fiber cloth 2, which is integrally connected to the surface of the blade body 1 by a silicone rubber adhesive 3. The ceramic fiber cloth 2 is woven with a herringbone pattern or has a herringbone pattern pattern hot-pressed onto the surface of the ceramic fiber felt using a mold, forming a symmetrical V-shaped groove surface similar to shark skin. The ceramic fiber cloth 2 is woven from aluminosilicate fiber or silicon carbide fiber, with a fiber diameter of 2.0-3.0 μm, a length of 100-200 mm, and a cloth layer thickness of 0.5-1.2 mm. The herringbone pattern on the ceramic fiber cloth 2 extends in the same direction as the fluid flow. The width H of the herringbone pattern 5 is 2-4 mm, the included angle of the symmetrically positioned V-shaped grooves is 90 degrees, and the depth of the V-shaped grooves is 0.2-0.6 mm. This embodiment of the present invention utilizes biomimetic principles and the unique anti-friction effect of shark skin texture to reduce the erosion effect of the fluid on the compressor blades during operation, thus extending the service life of the impeller.

[0024] Aluminosilicate fiber is a new type of lightweight and energy-saving refractory material. It is a cotton-like inorganic fiber made by melting calcite at a high temperature of 2100℃ and then processing it by high-speed centrifugation or blowing. Its main chemical components are SiO2 (48~52%), Al2O3 (43~49%), Fe2O3 (0.9~0.13%), CaO (less than 1%), and MgO (trace amount) [1].

[0025] Alumina silicate fiber has advantages such as high temperature resistance, good thermal stability, low thermal conductivity, good resistance to mechanical vibration, and small thermal expansion. It can be spun or woven into products such as alumina silicate fiber board, alumina silicate fiber felt, alumina silicate fiber rope, and alumina silicate fiber blanket, which are currently widely used for insulation in thermal energy equipment.

[0026] Silicon carbide fiber is an inorganic fiber with a β-silicon carbide structure, produced by spinning, carbonization, or vapor deposition using organosilicon compounds as raw materials. Silicon carbide fiber has a maximum service temperature of 1200℃, and its heat resistance and oxidation resistance are superior to carbon fiber. Its strength ranges from 1960 to 4410 MPa, and it retains over 80% of its strength at the maximum service temperature. It also exhibits good chemical stability.

[0027] The silicone rubber adhesive 3 is a KN-300 silicone glue. This adhesive is composed of a single-component organosilicon polymer compound, exhibiting a comprehensive balance of properties including peel strength, adhesion, lap shear strength, and high-temperature tack retention. It is suitable for hot-curing bonding of uncured silicone rubber to metals (stainless steel, steel, copper, etc.), resins, glass fibers, and ceramics. Due to the diverse structural forms of compressor impellers, the ceramic fiber cloth 2 needs to be cut to conform to the shape of the compressor blades. After applying the adhesive, it is placed on the surface of the blade body 1 and dried at room temperature for 30-60 minutes. Following drying, a two-stage curing process is performed: the first stage at 160℃ for 15-20 minutes, and the second stage at 250℃ for 4-24 hours.

[0028] To further improve the wear resistance, high-temperature resistance, and corrosion resistance of the blades, a 20-120μm thick PTFE coating can be applied to the surface of the ceramic fiber cloth 2. Polytetrafluoroethylene (PTFE) coatings possess excellent high-temperature resistance, with a wide operating temperature range, typically between -200℃ and 260℃, and can even be used for short periods at higher temperatures. Chemical stability: It resists the erosion of various strong acids, strong alkalis, and organic solvents, and is virtually insoluble in any solvent. Low coefficient of friction: PTFE coatings have an extremely low coefficient of friction, typically between 0.04 and 0.15, making them excellent in applications requiring lubrication. Anti-stick properties: The coating has good anti-stick properties, preventing the adhesion of dust, oil, etc., making it suitable for environments with high cleanliness requirements.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An anti-erosion structure of a compressor blade, characterized by comprising: It includes ceramic fiber cloth, which is bonded to the surface of the blade body by a silicone rubber adhesive to form a whole; the ceramic fiber cloth is woven with a herringbone pattern or a herringbone pattern is hot-pressed onto the surface of the ceramic fiber felt using a mold to form a symmetrical V-shaped groove surface similar to shark skin.

2. The anti-erosion structure of claim 1, wherein The ceramic fiber cloth is woven from aluminum silicate fiber or silicon carbide fiber, with a fiber diameter of 2.0-3.0μm, a length of 100-200mm, and a cloth layer thickness of 0.5-1.2mm.

3. The anti-erosion structure of claim 1, wherein The silicone rubber adhesive is specified as KN-300 silicone glue.

4. The anti-erosion structure of claim 1, wherein The herringbone pattern on the ceramic fiber cloth extends in the same direction as the fluid flow.

5. The structure for preventing erosion of a compressor blade according to claim 1, wherein The herringbone pattern has a width of 2-4mm, the included angle of the symmetrical V-shaped grooves is 90 degrees, and the depth of the V-shaped grooves is 0.2-0.6mm.

6. The structure for preventing erosion of a compressor blade according to claim 1, wherein The ceramic fiber cloth is cut to conform to the shape of the compressor blades.

7. The structure for preventing erosion of a compressor blade according to claim 1, wherein The surface of the ceramic fiber cloth is coated with a PTFE coating of 20-120 μm thickness.

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