US20090304519A1 - Gas-Compressor Impeller and Gas Compressor Having The Same - Google Patents
Gas-Compressor Impeller and Gas Compressor Having The Same Download PDFInfo
- Publication number
- US20090304519A1 US20090304519A1 US12/309,592 US30959207A US2009304519A1 US 20090304519 A1 US20090304519 A1 US 20090304519A1 US 30959207 A US30959207 A US 30959207A US 2009304519 A1 US2009304519 A1 US 2009304519A1
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- Prior art keywords
- gas
- abrasion
- blades
- compressor
- resistant films
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/02—Selection of particular materials
- F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/289—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps having provision against erosion or for dust-separation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/30—Manufacture with deposition of material
- F05D2230/31—Layer deposition
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/90—Coating; Surface treatment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/20—Oxide or non-oxide ceramics
- F05D2300/22—Non-oxide ceramics
- F05D2300/226—Carbides
- F05D2300/2263—Carbides of tungsten, e.g. WC
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
- F05D2300/603—Composites; e.g. fibre-reinforced
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
- F05D2300/611—Coating
Definitions
- the present invention relates to a gas-compressor impeller for compressing gas containing solid particles and to a gas compressor having the same.
- Gas compressors designed to mainly compress gas such as air sometimes need to compress gas contaminated with solid particles, depending on the use.
- gas compressors for compressing air used in ironworks sometimes compress air contaminated with iron oxide.
- Patent Document 1 discloses a technique in which a compressor member is plated with a nickel-phosphorus alloy.
- Patent Document 2 discloses a technique in which cermet particles containing tungsten carbide are thermally sprayed on a water wheel or pump for pumping liquid to form an abrasion-resistant thermal-spray film to prevent abrasion by hard particles (slurry erosion).
- Patent Document 1 Japanese Unexamined Patent Application, Publication No. 2001-200390
- Patent Document 2 Japanese Unexamined Patent Application, Publication No. 2005-187890 ([0002], [0003], [Table 1], etc.)
- Patent Document 1 forms an abrasion-resistant film by plating, the durability is not sufficient.
- Patent Document 2 discloses an abrasion-resistant thermal-spray film composed of a cermet material mainly containing tungsten carbide.
- Patent Document 2 in every respect, relates to a water wheel or pump intended for liquid or slurry, which does not compress gas. Therefore, as disclosed in Table 1 of Patent Document 2, although a slurry erosion evaluation is conducted, the adhesiveness of the abrasion-resistant film with respect to solid particles that collide at a higher speed than slurry (for example, solid particles floating in gas) is not taken into consideration at all.
- an abrasion-resistant film When an abrasion-resistant film is used for a gas-compressor impeller, solid particles collide with the abrasion-resistant film at various angles. At this time, when the solid particles collide with the abrasion-resistant film at a substantially right angle (for example, a collision angle of 60° or greater), the impact force during the collision is great. When this impact force is great, the abrasion-resistant film may peel off. That is, no matter how high the abrasion resistance of the abrasion-resistant film, if the adhesiveness thereof is low, it cannot withstand the impact force during the collision of the solid particles and may peel off. Accordingly, abrasion-resistant films for gas-compressor impellers need to exhibit not only abrasion resistance but also adhesiveness.
- Patent Document 2 does not disclose the region where the abrasion-resistant film is provided at all.
- the present invention has been made in view of such circumstances, and the object thereof is to provide a gas-compressor impeller which has excellent durability even when gas containing solid particles is compressed and which does not increase the cost, and a gas compressor having the same.
- Another object of the present invention is to provide a gas-compressor impeller provided with an abrasion-resistant film having not only abrasion resistance but also adhesiveness, and a gas compressor having the same.
- the present invention employs the following solutions.
- a gas-compressor impeller is installed in a gas compressor that compresses gas containing solid particles.
- the impeller has a hub portion and a plurality of blades extending substantially radially from an outer circumferential surface of the hub portion.
- the hub portion and the blades are rotated about a central axial line to compress gas.
- the blades have abrasion-resistant films only at gas inlet portions.
- the present inventors have found that, in impellers used in gas compressors that compress gas containing solid particles, damage to the gas inlet portions of the blades is significant but there is comparatively no advancement of damage to the other portions.
- the abrasion-resistant films are provided only at the gas inlet portions of the blades. Accordingly, because the abrasion-resistant films need to be only locally provided, the durability of the impeller can be easily improved at low cost.
- formation regions of the abrasion-resistant films provided only at the gas inlet portions may be provided from connecting positions of the blades to the hub portion in a height direction of the blades, and the size of the formation regions in the height direction of the blades may be gradually reduced from leading edges of the blades toward a downstream side.
- the damage from the solid particles contained in the gas is significant on the hub portion side of the blades, i.e., the base side of the blades. Therefore, the formation regions of the abrasion-resistant films are provided from the connecting positions of the blades to the hub portion in the height direction of the blades.
- the damage from the solid particles contained in the gas gradually decreases from the leading edges of the blades toward the downstream side.
- the size of the formation regions of the abrasion-resistant films in the height direction of the blades be gradually reduced from the leading edges of the blades toward the downstream side.
- the formation regions of the abrasion-resistant films provided on ventral sides of the blades may be larger than the formation regions of the abrasion-resistant films provided on back sides of the blades.
- the ventral sides of the blades are the pressure faces, they are more severely damaged than the back sides of the blades.
- the formation regions of the abrasion-resistant films on the ventral sides of the blades be larger than the formation regions of the abrasion-resistant films on the back sides of the blades.
- the abrasion-resistant films may be composed of a cermet material formed by thermally spraying a composite mainly containing tungsten carbide.
- the abrasion-resistant films need to have not only abrasion resistance but also adhesiveness so as not to be peeled off upon collision of the solid particles.
- abrasion-resistant films by making the abrasion-resistant films from a cermet material formed by thermally spraying a composite mainly containing tungsten carbide, not only abrasion resistance but also adhesiveness can be ensured.
- Examples of the composite mainly containing tungsten carbide (WC) include WC—NiCr, WC—Co, and WC—CoCr.
- a preferable thermal spraying method is ultra high-speed flame thermal spraying because it provides a great particle-flying speed to improve adhesiveness.
- a gas compressor according to a second aspect of the present invention includes any one of the above-described gas-compressor impellers.
- the gas compressor according to the second aspect of the present invention includes any one of the above-described gas-compressor impellers, a gas compressor having excellent durability can be provided even when gas containing solid particles is compressed.
- a centrifugal compressor is suitable as the gas compressor.
- a gas-compressor impeller having excellent durability can be provided at low cost.
- a cermet material formed by thermally spraying a composite mainly containing tungsten carbide as the abrasion-resistant films not only abrasion resistance but also adhesiveness of the abrasion-resistant films can be improved.
- FIG. 1 is a schematic vertical sectional view showing a gas compressor according to an embodiment of the present invention.
- FIG. 2A is a front view of an impeller according to an embodiment of the present invention.
- FIG. 2B is a perspective view of an impeller according to an embodiment of the present invention, showing the back side of a blade.
- FIG. 3A is a perspective view of the impeller of FIG. 2A .
- FIG. 3B is a perspective view of the impeller of FIG. 2A , showing the ventral side of a blade.
- FIG. 4A is a plan view showing a sample used in an abrasion resistance test.
- FIG. 4B is a side view showing the sample used in the abrasion resistance test.
- FIG. 5 is a schematic view showing the configuration of an experimental device used in the abrasion resistance test.
- FIG. 6 is a schematic perspective view showing an abraded portion formed in the sample.
- FIG. 7 is a graph showing an example of measurement data of the abrasion depth.
- FIG. 8 is a graph showing the abrasion resistances according to this embodiment and according to comparative examples.
- FIG. 9A is a plan view of a sample used in an adhesiveness test.
- FIG. 9B is a side view of the sample used in the adhesiveness test.
- FIG. 10 is a schematic view showing the configuration of an experimental device used in the adhesiveness test.
- FIG. 11 is a graph showing the adhesiveness according to this embodiment and according to the comparative examples.
- FIG. 1 shows a vertical cross-section of a relevant part of a centrifugal compressor (gas compressor) 1 according to this embodiment.
- the centrifugal compressor 1 is used to compress air containing solid particles P such as, for example, iron oxide.
- the centrifugal compressor 1 has an impeller 3 , an air-intake flow path 5 provided upstream of the impeller 3 , and a discharge flow path 7 provided downstream of the impeller 3 .
- the impeller 3 is rotated about a central axial line L by a driving source (not shown).
- the impeller 3 has a hub portion 10 , a plurality of blades 12 extending substantially radially from the outer circumferential surface of the hub portion 10 , and a shroud 14 connected to the upper edges of the blades 12 and forming a flow path between the blades 12 and the hub portion 10 .
- the impeller 3 is made of low-alloy steel (for example, JIS SNCM431) or stainless steel (for example, SUS630).
- reference numeral 12 a denotes a leading edge of one of the blades 12
- arrows A denote flow lines of the compressed air.
- the leading edges 12 a of the blades 12 are partially exposed.
- the impeller 3 rotates clockwise.
- FIG. 2B shows an enlarged perspective view of the leading edge side of the blade 12 denoted by reference numeral BL 1 in FIG. 2A .
- the face of the blade shown in FIG. 2B is the back side face.
- an abrasion-resistant film 20 is formed at a gas inlet portion including the leading edge 12 a of the blade 12 .
- the abrasion-resistant film 20 is formed only at the gas inlet portion, not at the other portions.
- a formation region of the abrasion-resistant film 20 is provided from a connecting position of the blade 12 to the hub portion (i.e., the base of the blade 12 ) in the height direction of the blade 12 .
- the abrasion-resistant film is formed also at a central side 10 a of the inlet portion of the hub 10 .
- FIG. 3A shows a perspective view of the impeller 3 .
- openings 18 for discharging compressed gas are provided around the outer circumference of the impeller.
- the impeller 3 according to this embodiment is used in a centrifugal compressor that performs compression while radially deflecting gas flow flowing in the axial direction on the central axis side.
- FIG. 3B shows an enlarged perspective view of the blade 12 denoted by reference numeral BL 2 in FIG. 3A .
- the face of the blade shown in FIG. 3B is a ventral side face which receives the dynamic pressure of the gas taken in.
- the abrasion-resistant film 20 is formed at the gas inlet portion including the leading edge 12 a of the blade 12 .
- the abrasion-resistant film 20 is formed only at the gas inlet portion, not at the other portions.
- the formation region of the abrasion-resistant film 20 is provided from the connecting position of the blade 12 to the hub portion (i.e., the base of the blade 12 ) in the height direction of the blade 12 .
- the formation region of the abrasion-resistant film 20 provided on the ventral side of the blade 12 is larger than the formation region of the abrasion-resistant film (refer to FIG. 2B ) provided on the back side of the blade 12 .
- the abrasion-resistant film 20 is a cermet material formed by thermally spraying a composite mainly containing tungsten carbide (WC).
- a suitable composite mainly containing tungsten carbide include WC—NiCr, WC—Co, and WC—CoCr.
- a preferable thermal spraying method is ultra high-speed flame thermal spraying.
- the centrifugal compressor 1 configured as described above takes in gas from the air-intake flow path 5 , compresses the gas with the impeller 10 , and then discharges the gas to the discharge flow path 7 .
- the solid particles contained in the gas are subjected to centrifugal force when they pass through the impeller 10 and are concentrated on the hub portion 10 side.
- the abrasion-resistant films 20 are provided on the blades 12 so as to prevent damage from collision with these solid particles.
- the abrasion-resistant films 20 according to this embodiment have abrasion resistance and adhesiveness (peel resistance). Test results of the evaluation of their performances are shown below.
- SNCM431 having a size of 60 mm ⁇ 50 mm ⁇ 10 mm was used as a base material. Edges of the sample 21 were chamfered to C0.5. A wide surface 22 of the sample 21 was coated with an abrasion-resistant film and subjected to an experiment.
- the abrasion-resistant film was formed by thermal spraying.
- thermal spraying materials tungsten carbide (WC) cermet materials, namely, WC-27% NiCr, WC-10% Co-4% Cr, and WC-12% Co, were used.
- each sample was degreased by trichloroethylene vapor degreasing. Then, using an alumina grid of #60, blasting was performed at a gas pressure of 4 kgf/cm 2 . Then, thermal spraying was performed under the following conditions to form an abrasion-resistant film.
- the present invention WC cermet materials (WC-27% NiCr, WC-10% Co-4% Cr, and WC-12% Co)
- each samples 21 was blasted with a predetermined amount of conical silica sand, serving as hard particles, from a nozzle 24 , and the amount of abrasion was measured.
- the angle formed between the sample 21 and the conical silica sand ejected from the nozzle 24 was set to 60°.
- the distance between the nozzle 24 and the sample 21 was set to 93 mm.
- the amount of shot was set to 350 g at 4.7 g/sec.
- the collision speed of the ejected conical silica sand was set to give substantially the same energy as that of an actual apparatus in which iron oxide (Fe 3 O 4 ) having a particle diameter of 3 ⁇ m is blasted at 115 m/s; in this test, it was set to 52 m/s.
- the conditions of this test are shown in the following table.
- the abrasion depth of an abraded portion 25 formed in each sample 21 was measured with a contact-type surface-roughness meter in triplicate and the average value was obtained. Arrows shown in FIG. 6 indicate the scanning direction of the contact-type surface-roughness meter.
- FIG. 7 shows an example of data at the time of measuring the amount of abrasion.
- the abscissa represents the scanning distance of the contact-type surface-roughness meter and the ordinate represents the abrasion depth (amount of abrasion).
- FIG. 8 shows the result of the above-described test.
- the abrasion resistance factor shown in the ordinate in FIG. 8 is the value obtained by dividing the amount of abrasion (abrasion depth) of the base material SNCM431 having no abrasion-resistant film by the amount of abrasion (abrasion depth) of each sample having the abrasion-resistant film. Accordingly, the smaller the amount of abrasion of the sample, the larger the abrasion resistance factor.
- the abrasion-resistant films composed of the WC cermet materials according to this embodiment provide greater abrasion resistance factors compared to those according to the comparative examples.
- the fabrication processes of the abrasion-resistant films and of the samples were the same as those of the above-described abrasion resistance test. However, in the adhesiveness test, the grinding step performed in the abrasion resistance test after formation of the abrasion-resistant film was not performed.
- the bending test apparatus had a bending jig base 30 for supporting each sample 27 from below at two points and a bending jig 32 for pressing the sample 27 downward at a single point.
- the sample 27 with a coating surface 29 having the abrasion-resistant film facing down was placed on the bending jig base 30 , and a pressure was applied to the sample 27 from above with the bending jig 32 .
- three-point bending was performed.
- the tip portion which served as the pressing portion of the bending jig 30 , had three radii, namely, 5 mm, 10 mm, and 25 mm.
- the bending speed, i.e., descending speed, of the bending jig 30 was 1 mm/s or less.
- the number of samples one sample was used under each condition, and a total 15 samples (three bend radii ⁇ five types of abrasion-resistant film) were used.
- the presence or absence of peeling was determined by carrying out observation at 20 times magnification with a microscope.
- FIG. 11 shows the test result of the adhesiveness test.
- the ordinate in FIG. 11 represents the peeling limit bend radius (mm). Because a smaller peeling bending limit radius indicates the ability to resist a larger curvature without peeling, it can be said that the adhesiveness is large.
- the abrasion-resistant films composed of the WC cermet materials according to this embodiment all show a peeling limit bend radius of 5 mm. Accordingly, it can be said that the abrasion-resistant films according to this embodiment have greater adhesiveness than those according to the comparative examples, each having a peeling limit bend radius of 10 mm or 25 mm.
- the abrasion-resistant films composed of the WC cermet materials according to this embodiment have not only abrasion resistance but also adhesiveness.
- the reason for the improved adhesiveness may be as follows.
- the abrasion-resistant films composed of the WC cermet materials according to this embodiment were formed by “ultra high-speed flame thermal spraying” using combustion gas flames as a heat source.
- the abrasion-resistant films composed of alumina-titania and chromium oxide ceramic according to the comparative examples were formed by “plasma thermal spraying” using plasma as a heat source.
- the particle-flying speed is 500 m/s or more, which is much faster than the particle-flying speed in the plasma thermal spraying (from 100 m/s to 200 m/s). Therefore, in the ultra high-speed flame thermal spraying, the collision energy of the thermal spraying particles with the base material is great, whereby the adhesiveness is greater compared to that obtained in the plasma thermal spraying.
- the WC powders according to this embodiment have larger specific gravities than the Cr 3 C 2 powder according to the comparative example that employs the ultra high-speed flame thermal spraying similarly to this embodiment. Therefore, with the WC powders according to this embodiment, the thermal spraying particles have greater collision energy with the base material than the Cr 3 C 2 powder according to the comparative example, thus giving greater adhesiveness.
- the abrasion-resistant films according to this embodiment which are composed of the WC cermet materials and formed by the ultra high-speed flame thermal spraying, have the best adhesiveness.
- the abrasion-resistant films 20 are provided only at the gas inlet portions of the blades 12 , that is, the abrasion-resistant films 20 are provided locally, the durability of the impeller 3 can be easily improved at low cost.
- Damage from the solid particles contained in gas is severer at portions of the blades 12 closer to the hub portion 10 , i.e., the base side of the blades 12 . Therefore, in this embodiment, the abrasion-resistant films 20 are provided from the bases of the blades 12 in the height direction of the blades. Damage from the solid particles contained in gas is smaller at portions farther from the leading edges 12 a of the blades 12 toward the downstream side. Therefore, in this embodiment, the size of the formation regions of the abrasion-resistant films 20 in the blade's height direction is gradually reduced from the leading edges 12 a of the blades toward the downstream side. Furthermore, the ventral sides of the blades 12 are pressure faces, which are damaged more severely than the ventral sides of the blades.
- the formation regions of the abrasion-resistant films 20 on the ventral sides of the blades 12 are larger than the formation regions of the abrasion-resistant films on the back sides of the blades 12 .
- the abrasion-resistant films 20 are formed only at the necessary portions, the durability of the impeller 3 can be improved without increasing the cost.
- the abrasion-resistant films 20 according to this embodiment are composed of a cermet material formed by performing ultra high-speed flame thermal spraying of a composite containing tungsten carbide, not only abrasion resistance but also adhesiveness can be ensured.
- the abrasion-resistant films need to have not only abrasion resistance but also adhesiveness. Accordingly, the abrasion-resistant films are particularly useful.
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Abstract
An object is to provide a gas-compressor impeller which has excellent durability even when gas containing solid particles is compressed and which does not increase the cost. A gas-compressor impeller installed in a gas compressor that compresses gas containing solid particles has a hub portion and a plurality of blades extending substantially radially from the outer circumferential surface of the hub portion. The hub portion and the blades are rotated about the central axial line to compress gas. The blades have abrasion-resistant films only at gas inlet portions.
Description
- The present invention relates to a gas-compressor impeller for compressing gas containing solid particles and to a gas compressor having the same.
- Gas compressors designed to mainly compress gas such as air sometimes need to compress gas contaminated with solid particles, depending on the use. For example, gas compressors for compressing air used in ironworks sometimes compress air contaminated with iron oxide.
- Thus, if gas is contaminated with solid particles, damage to impellers due to solid particles cannot be ignored. To prevent damage from solid particles,
Patent Document 1 discloses a technique in which a compressor member is plated with a nickel-phosphorus alloy. - On the other hand, though not directed to a gas compressor,
Patent Document 2 discloses a technique in which cermet particles containing tungsten carbide are thermally sprayed on a water wheel or pump for pumping liquid to form an abrasion-resistant thermal-spray film to prevent abrasion by hard particles (slurry erosion). - Patent Document 1: Japanese Unexamined Patent Application, Publication No. 2001-200390
- Patent Document 2: Japanese Unexamined Patent Application, Publication No. 2005-187890 ([0002], [0003], [Table 1], etc.)
- However, because the technique disclosed in
Patent Document 1 forms an abrasion-resistant film by plating, the durability is not sufficient. - In addition, because the aforementioned document does not disclose the region where the abrasion-resistant film is formed, it is assumed that the entire compressor member is plated. However, because gas-compressor impellers, among others, have three-dimensional shapes, in the case of electrolytic plating, it is difficult to form a film whose thickness is adjusted to a desired value. Thus, sufficient durability may not be obtained.
-
Patent Document 2 discloses an abrasion-resistant thermal-spray film composed of a cermet material mainly containing tungsten carbide. However,Patent Document 2, in every respect, relates to a water wheel or pump intended for liquid or slurry, which does not compress gas. Therefore, as disclosed in Table 1 ofPatent Document 2, although a slurry erosion evaluation is conducted, the adhesiveness of the abrasion-resistant film with respect to solid particles that collide at a higher speed than slurry (for example, solid particles floating in gas) is not taken into consideration at all. - When an abrasion-resistant film is used for a gas-compressor impeller, solid particles collide with the abrasion-resistant film at various angles. At this time, when the solid particles collide with the abrasion-resistant film at a substantially right angle (for example, a collision angle of 60° or greater), the impact force during the collision is great. When this impact force is great, the abrasion-resistant film may peel off. That is, no matter how high the abrasion resistance of the abrasion-resistant film, if the adhesiveness thereof is low, it cannot withstand the impact force during the collision of the solid particles and may peel off. Accordingly, abrasion-resistant films for gas-compressor impellers need to exhibit not only abrasion resistance but also adhesiveness.
- In addition, similarly to
Patent Document 1,Patent Document 2 does not disclose the region where the abrasion-resistant film is provided at all. - The present invention has been made in view of such circumstances, and the object thereof is to provide a gas-compressor impeller which has excellent durability even when gas containing solid particles is compressed and which does not increase the cost, and a gas compressor having the same.
- Another object of the present invention is to provide a gas-compressor impeller provided with an abrasion-resistant film having not only abrasion resistance but also adhesiveness, and a gas compressor having the same.
- To overcome the above-described problems, the present invention employs the following solutions.
- A gas-compressor impeller according to a first aspect of the present invention is installed in a gas compressor that compresses gas containing solid particles. The impeller has a hub portion and a plurality of blades extending substantially radially from an outer circumferential surface of the hub portion. The hub portion and the blades are rotated about a central axial line to compress gas. The blades have abrasion-resistant films only at gas inlet portions.
- As a result of intensive study, the present inventors have found that, in impellers used in gas compressors that compress gas containing solid particles, damage to the gas inlet portions of the blades is significant but there is comparatively no advancement of damage to the other portions. Thus, in the first aspect of the present invention, the abrasion-resistant films are provided only at the gas inlet portions of the blades. Accordingly, because the abrasion-resistant films need to be only locally provided, the durability of the impeller can be easily improved at low cost.
- Furthermore, in the gas-compressor impeller according to the first aspect of the present invention, formation regions of the abrasion-resistant films provided only at the gas inlet portions may be provided from connecting positions of the blades to the hub portion in a height direction of the blades, and the size of the formation regions in the height direction of the blades may be gradually reduced from leading edges of the blades toward a downstream side.
- The damage from the solid particles contained in the gas is significant on the hub portion side of the blades, i.e., the base side of the blades. Therefore, the formation regions of the abrasion-resistant films are provided from the connecting positions of the blades to the hub portion in the height direction of the blades.
- The damage from the solid particles contained in the gas gradually decreases from the leading edges of the blades toward the downstream side. Thus, it is preferable that the size of the formation regions of the abrasion-resistant films in the height direction of the blades be gradually reduced from the leading edges of the blades toward the downstream side.
- Furthermore, in the gas-compressor impeller according to the first aspect of the present invention, the formation regions of the abrasion-resistant films provided on ventral sides of the blades may be larger than the formation regions of the abrasion-resistant films provided on back sides of the blades.
- Because the ventral sides of the blades are the pressure faces, they are more severely damaged than the back sides of the blades. Thus, it is preferable that the formation regions of the abrasion-resistant films on the ventral sides of the blades be larger than the formation regions of the abrasion-resistant films on the back sides of the blades.
- Furthermore, in the gas-compressor impeller according to the first aspect of the present invention, the abrasion-resistant films may be composed of a cermet material formed by thermally spraying a composite mainly containing tungsten carbide.
- In a gas compressor that compresses gas containing solid particles, collision energy is great because of the high-speed solid particles. Accordingly, the abrasion-resistant films need to have not only abrasion resistance but also adhesiveness so as not to be peeled off upon collision of the solid particles. In the first aspect of the present invention, by making the abrasion-resistant films from a cermet material formed by thermally spraying a composite mainly containing tungsten carbide, not only abrasion resistance but also adhesiveness can be ensured.
- Examples of the composite mainly containing tungsten carbide (WC) include WC—NiCr, WC—Co, and WC—CoCr.
- A preferable thermal spraying method is ultra high-speed flame thermal spraying because it provides a great particle-flying speed to improve adhesiveness.
- A gas compressor according to a second aspect of the present invention includes any one of the above-described gas-compressor impellers.
- Because the gas compressor according to the second aspect of the present invention includes any one of the above-described gas-compressor impellers, a gas compressor having excellent durability can be provided even when gas containing solid particles is compressed.
- A centrifugal compressor is suitable as the gas compressor.
- According to the present invention, because the abrasion-resistant films are provided only at the gas inlet portions of the blades, a gas-compressor impeller having excellent durability can be provided at low cost.
- In addition, in the present invention, by using a cermet material formed by thermally spraying a composite mainly containing tungsten carbide as the abrasion-resistant films, not only abrasion resistance but also adhesiveness of the abrasion-resistant films can be improved.
-
FIG. 1 is a schematic vertical sectional view showing a gas compressor according to an embodiment of the present invention. -
FIG. 2A is a front view of an impeller according to an embodiment of the present invention. -
FIG. 2B is a perspective view of an impeller according to an embodiment of the present invention, showing the back side of a blade. -
FIG. 3A is a perspective view of the impeller ofFIG. 2A . -
FIG. 3B is a perspective view of the impeller ofFIG. 2A , showing the ventral side of a blade. -
FIG. 4A is a plan view showing a sample used in an abrasion resistance test. -
FIG. 4B is a side view showing the sample used in the abrasion resistance test. -
FIG. 5 is a schematic view showing the configuration of an experimental device used in the abrasion resistance test. -
FIG. 6 is a schematic perspective view showing an abraded portion formed in the sample. -
FIG. 7 is a graph showing an example of measurement data of the abrasion depth. -
FIG. 8 is a graph showing the abrasion resistances according to this embodiment and according to comparative examples. -
FIG. 9A is a plan view of a sample used in an adhesiveness test. -
FIG. 9B is a side view of the sample used in the adhesiveness test. -
FIG. 10 is a schematic view showing the configuration of an experimental device used in the adhesiveness test. -
FIG. 11 is a graph showing the adhesiveness according to this embodiment and according to the comparative examples. -
- 1: gas compressor
- 3: impeller
- 10: hub portion
- 12: blade
- 14: shroud
- 20: abrasion-resistant film
- An embodiment of the present invention will be described below with reference to the drawings.
-
FIG. 1 shows a vertical cross-section of a relevant part of a centrifugal compressor (gas compressor) 1 according to this embodiment. - The
centrifugal compressor 1 is used to compress air containing solid particles P such as, for example, iron oxide. Thecentrifugal compressor 1 has animpeller 3, an air-intake flow path 5 provided upstream of theimpeller 3, and adischarge flow path 7 provided downstream of theimpeller 3. - The
impeller 3 is rotated about a central axial line L by a driving source (not shown). Theimpeller 3 has ahub portion 10, a plurality ofblades 12 extending substantially radially from the outer circumferential surface of thehub portion 10, and ashroud 14 connected to the upper edges of theblades 12 and forming a flow path between theblades 12 and thehub portion 10. - The
impeller 3 is made of low-alloy steel (for example, JIS SNCM431) or stainless steel (for example, SUS630). - In
FIG. 1 ,reference numeral 12 a denotes a leading edge of one of theblades 12, and arrows A denote flow lines of the compressed air. - As shown in
FIG. 2A , in the front view of theimpeller 3 viewed from the upstream side of gas flow, the leadingedges 12 a of theblades 12 are partially exposed. InFIG. 2A , theimpeller 3 rotates clockwise. -
FIG. 2B shows an enlarged perspective view of the leading edge side of theblade 12 denoted by reference numeral BL1 inFIG. 2A . The face of the blade shown inFIG. 2B is the back side face. As shown with hatching inFIG. 2B , an abrasion-resistant film 20 is formed at a gas inlet portion including the leadingedge 12 a of theblade 12. The abrasion-resistant film 20 is formed only at the gas inlet portion, not at the other portions. - A formation region of the abrasion-
resistant film 20 is provided from a connecting position of theblade 12 to the hub portion (i.e., the base of the blade 12) in the height direction of theblade 12. The size of the formation region of the abrasion-resistant film 20 in the height direction of theblade 12 is gradually reduced from the leadingedge 12 a of the blade toward the downstream side of the gas flow. More specifically, it is preferable that the size, h, of the formation region of the abrasion-resistant film 20 in the blade's height direction at theleading edge 12 a of the blade be set to about ¾H, where H is the height of the leadingedge 12 a of the blade. It is also preferable that the formation region of the abrasion-resistant film 20 be formed such that the formation region is gradually reduced from the leadingedge 12 a of the blade to a position around LL=h/2 on the downstream side. - As shown with hatching in
FIG. 2A , the abrasion-resistant film is formed also at acentral side 10 a of the inlet portion of thehub 10. -
FIG. 3A shows a perspective view of theimpeller 3. As shown inFIG. 3A ,openings 18 for discharging compressed gas are provided around the outer circumference of the impeller. As shown, theimpeller 3 according to this embodiment is used in a centrifugal compressor that performs compression while radially deflecting gas flow flowing in the axial direction on the central axis side. -
FIG. 3B shows an enlarged perspective view of theblade 12 denoted by reference numeral BL2 inFIG. 3A . The face of the blade shown inFIG. 3B is a ventral side face which receives the dynamic pressure of the gas taken in. As shown with hatching inFIG. 3B , the abrasion-resistant film 20 is formed at the gas inlet portion including the leadingedge 12 a of theblade 12. The abrasion-resistant film 20 is formed only at the gas inlet portion, not at the other portions. - The formation region of the abrasion-
resistant film 20 is provided from the connecting position of theblade 12 to the hub portion (i.e., the base of the blade 12) in the height direction of theblade 12. The size of the formation region of the abrasion-resistant film 20 in the height direction of theblade 12 is gradually reduced from the leadingedge 12 a of the blade toward the downstream side of the gas flow. More specifically, it is preferable that the size, h, of the formation region of the abrasion-resistant film 20 in the blade's height direction at theleading edge 12 a of the blade be set to about ¾ H, where H is the height of the leadingedge 12 a of the blade. It is also preferable that the formation region of the abrasion-resistant film 20 be formed such that the formation region is gradually reduced from the leadingedge 12 a of the blade to a position around LH=h on the downstream side. - As described above, the formation region of the abrasion-
resistant film 20 provided on the ventral side of theblade 12 is larger than the formation region of the abrasion-resistant film (refer toFIG. 2B ) provided on the back side of theblade 12. - The abrasion-
resistant film 20 is a cermet material formed by thermally spraying a composite mainly containing tungsten carbide (WC). Examples of a suitable composite mainly containing tungsten carbide include WC—NiCr, WC—Co, and WC—CoCr. A preferable thermal spraying method is ultra high-speed flame thermal spraying. - As shown in
FIG. 1 , thecentrifugal compressor 1 configured as described above takes in gas from the air-intake flow path 5, compresses the gas with theimpeller 10, and then discharges the gas to thedischarge flow path 7. The solid particles contained in the gas are subjected to centrifugal force when they pass through theimpeller 10 and are concentrated on thehub portion 10 side. The abrasion-resistant films 20 are provided on theblades 12 so as to prevent damage from collision with these solid particles. - The abrasion-
resistant films 20 according to this embodiment have abrasion resistance and adhesiveness (peel resistance). Test results of the evaluation of their performances are shown below. - As shown in
FIGS. 4A and 4B , forsamples 21, SNCM431 having a size of 60 mm×50 mm×10 mm was used as a base material. Edges of thesample 21 were chamfered to C0.5. Awide surface 22 of thesample 21 was coated with an abrasion-resistant film and subjected to an experiment. - The abrasion-resistant film was formed by thermal spraying. As thermal spraying materials according to this embodiment, tungsten carbide (WC) cermet materials, namely, WC-27% NiCr, WC-10% Co-4% Cr, and WC-12% Co, were used. As comparative examples, Cr3C2-25% NiCr, Al2O3-3% TiO2, and Cr2O3 were used. Their composition ratios are expressed in percentage by weight.
- First, each sample was degreased by trichloroethylene vapor degreasing. Then, using an alumina grid of #60, blasting was performed at a gas pressure of 4 kgf/cm2. Then, thermal spraying was performed under the following conditions to form an abrasion-resistant film.
- (i) The present invention: WC cermet materials (WC-27% NiCr, WC-10% Co-4% Cr, and WC-12% Co)
-
- Thermal spray gun: JP-5000 (Eutectic of Japan, Ltd.)
- Conditions: Standard conditions of JP-5000 (ultra high-speed flame thermal spraying)
- Thickness: 0.5 mm
(ii) Comparative Example: Cr3C2 cermet material (Cr3C2-25% NiCr) - Thermal spray gun: JP-5000 (Eutectic of Japan, Ltd.)
- Conditions: Standard conditions of JP-5000 (ultra high-speed flame thermal spraying)
- Thickness: 0.5 mm
(iii) Comparative examples: alumina-titania (Al2O3-3% TiO2) and chromium oxide ceramic (Cr2O3) - Thermal spray gun: F4 (Sulzer Metco (Japan) Ltd.)
- Conditions: Standard conditions of F4 (plasma thermal spraying)
- Thickness: 0.5 mm
- After the abrasion-resistant films were formed by thermal spraying under the above-described conditions, grinding was performed using a diamond wheel.
- As shown in
FIG. 5 , eachsamples 21 was blasted with a predetermined amount of conical silica sand, serving as hard particles, from anozzle 24, and the amount of abrasion was measured. The angle formed between thesample 21 and the conical silica sand ejected from thenozzle 24 was set to 60°. The distance between thenozzle 24 and thesample 21 was set to 93 mm. The amount of shot was set to 350 g at 4.7 g/sec. The collision speed of the ejected conical silica sand was set to give substantially the same energy as that of an actual apparatus in which iron oxide (Fe3O4) having a particle diameter of 3 μm is blasted at 115 m/s; in this test, it was set to 52 m/s. The conditions of this test are shown in the following table. -
TABLE 1 ITEM SET VALUE FOR TEST REMARKS Average 6.3 μm Composition(SiO2: 99.74%, Particle Size Al2O3: 0.05%, of Sprayed Fe2O3: 0.005%) Silica Projection 60° Angle Projected 350 g (4.7 g/sec) Amount of Silica Projection 52 m/s (set to give The energy is intended Speed of the same particle to be the same as that Particles collision energy as in practice. that given by Colliding Particles particle projection Causing Erosion in in practice) Practice: Fe3O4 The projection speed Particle Diameter: 3 μm of particles is Collision Speed: 115 m/s calculated using Hinze & Zijnen equation with the provision that it is the same as the speed of air flow. - As shown in
FIG. 6 , the abrasion depth of an abradedportion 25 formed in eachsample 21 was measured with a contact-type surface-roughness meter in triplicate and the average value was obtained. Arrows shown inFIG. 6 indicate the scanning direction of the contact-type surface-roughness meter. -
FIG. 7 shows an example of data at the time of measuring the amount of abrasion. InFIG. 7 , the abscissa represents the scanning distance of the contact-type surface-roughness meter and the ordinate represents the abrasion depth (amount of abrasion). -
FIG. 8 shows the result of the above-described test. The abrasion resistance factor shown in the ordinate inFIG. 8 is the value obtained by dividing the amount of abrasion (abrasion depth) of the base material SNCM431 having no abrasion-resistant film by the amount of abrasion (abrasion depth) of each sample having the abrasion-resistant film. Accordingly, the smaller the amount of abrasion of the sample, the larger the abrasion resistance factor. - As is clear from
FIG. 8 , the abrasion-resistant films composed of the WC cermet materials according to this embodiment provide greater abrasion resistance factors compared to those according to the comparative examples. - As shown in
FIGS. 9A and 9B , forsamples 27, SNCM431 having a size of 100 mm×30 mm×5 mm was used as a base material. Edges of thesample 27 were slightly chamfered. Awide surface 28 of thesample 27 was coated with an abrasion-resistant film and subjected to an experiment. - The fabrication processes of the abrasion-resistant films and of the samples were the same as those of the above-described abrasion resistance test. However, in the adhesiveness test, the grinding step performed in the abrasion resistance test after formation of the abrasion-resistant film was not performed.
- Using a bending test apparatus shown in
FIG. 10 , the bending limit radius of the abrasion-resistant films was measured. - The bending test apparatus had a bending
jig base 30 for supporting eachsample 27 from below at two points and a bendingjig 32 for pressing thesample 27 downward at a single point. Thesample 27 with acoating surface 29 having the abrasion-resistant film facing down was placed on the bendingjig base 30, and a pressure was applied to thesample 27 from above with the bendingjig 32. Thus, three-point bending was performed. - The tip portion, which served as the pressing portion of the bending
jig 30, had three radii, namely, 5 mm, 10 mm, and 25 mm. The bending speed, i.e., descending speed, of the bendingjig 30 was 1 mm/s or less. Regarding the number of samples, one sample was used under each condition, and a total 15 samples (three bend radii×five types of abrasion-resistant film) were used. - The presence or absence of peeling was determined by carrying out observation at 20 times magnification with a microscope.
-
FIG. 11 shows the test result of the adhesiveness test. The ordinate inFIG. 11 represents the peeling limit bend radius (mm). Because a smaller peeling bending limit radius indicates the ability to resist a larger curvature without peeling, it can be said that the adhesiveness is large. - As is clear from
FIG. 11 , the abrasion-resistant films composed of the WC cermet materials according to this embodiment all show a peeling limit bend radius of 5 mm. Accordingly, it can be said that the abrasion-resistant films according to this embodiment have greater adhesiveness than those according to the comparative examples, each having a peeling limit bend radius of 10 mm or 25 mm. - As has been described, the abrasion-resistant films composed of the WC cermet materials according to this embodiment have not only abrasion resistance but also adhesiveness. The reason for the improved adhesiveness may be as follows.
- The abrasion-resistant films composed of the WC cermet materials according to this embodiment were formed by “ultra high-speed flame thermal spraying” using combustion gas flames as a heat source. On the other hand, the abrasion-resistant films composed of alumina-titania and chromium oxide ceramic according to the comparative examples were formed by “plasma thermal spraying” using plasma as a heat source. In the ultra high-speed flame thermal spraying, the particle-flying speed is 500 m/s or more, which is much faster than the particle-flying speed in the plasma thermal spraying (from 100 m/s to 200 m/s). Therefore, in the ultra high-speed flame thermal spraying, the collision energy of the thermal spraying particles with the base material is great, whereby the adhesiveness is greater compared to that obtained in the plasma thermal spraying.
- In addition, the WC powders according to this embodiment have larger specific gravities than the Cr3C2 powder according to the comparative example that employs the ultra high-speed flame thermal spraying similarly to this embodiment. Therefore, with the WC powders according to this embodiment, the thermal spraying particles have greater collision energy with the base material than the Cr3C2 powder according to the comparative example, thus giving greater adhesiveness.
- Accordingly, the abrasion-resistant films according to this embodiment, which are composed of the WC cermet materials and formed by the ultra high-speed flame thermal spraying, have the best adhesiveness.
- As has been described, according to this embodiment, the following advantages are obtained.
- Because the abrasion-
resistant films 20 are provided only at the gas inlet portions of theblades 12, that is, the abrasion-resistant films 20 are provided locally, the durability of theimpeller 3 can be easily improved at low cost. - Damage from the solid particles contained in gas is severer at portions of the
blades 12 closer to thehub portion 10, i.e., the base side of theblades 12. Therefore, in this embodiment, the abrasion-resistant films 20 are provided from the bases of theblades 12 in the height direction of the blades. Damage from the solid particles contained in gas is smaller at portions farther from the leadingedges 12 a of theblades 12 toward the downstream side. Therefore, in this embodiment, the size of the formation regions of the abrasion-resistant films 20 in the blade's height direction is gradually reduced from the leadingedges 12 a of the blades toward the downstream side. Furthermore, the ventral sides of theblades 12 are pressure faces, which are damaged more severely than the ventral sides of the blades. Therefore, in this embodiment, the formation regions of the abrasion-resistant films 20 on the ventral sides of theblades 12 are larger than the formation regions of the abrasion-resistant films on the back sides of theblades 12. Thus, according to this embodiment, because the abrasion-resistant films 20 are formed only at the necessary portions, the durability of theimpeller 3 can be improved without increasing the cost. - Because the abrasion-
resistant films 20 according to this embodiment are composed of a cermet material formed by performing ultra high-speed flame thermal spraying of a composite containing tungsten carbide, not only abrasion resistance but also adhesiveness can be ensured. In a gas compressor that compresses gas containing solid particles, because the collision energy is great due to the high-speed solid particles, the abrasion-resistant films need to have not only abrasion resistance but also adhesiveness. Accordingly, the abrasion-resistant films are particularly useful.
Claims (5)
1. A gas-compressor impeller installed in a gas compressor that compresses gas containing solid particles, the impeller having a hub portion and a plurality of blades extending radially from an outer circumferential surface of the hub portion, the hub portion and the blades being rotated about a central axial line to compress gas,
wherein the blades have abrasion-resistant films only at gas inlet portions.
2. The gas-compressor impeller according to claim 1 ,
wherein formation regions of the abrasion-resistant films provided only at the gas inlet portions are provided from connecting positions of the blades to the hub portion in a height direction of the blades, and
the size of the formation regions in the height direction of the blades is gradually reduced from leading edges of the blades toward a downstream side.
3. The gas-compressor impeller according to claim 2 ,
wherein the formation regions of the abrasion-resistant films provided on ventral sides of the blades are larger than the formation regions of the abrasion-resistant films provided on back sides of the blades.
4. The gas-compressor impeller according to claim 1 ,
wherein the abrasion-resistant films are composed of a cermet material formed by thermally spraying a composite mainly containing tungsten carbide.
5. A gas compressor having the gas-compressor impeller claim 1 .
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP2007-005852 | 2007-01-15 | ||
JP2007005852A JP4486652B2 (en) | 2007-01-15 | 2007-01-15 | Impeller for gas compressor and gas compressor provided with the same |
PCT/JP2007/074527 WO2008087830A1 (en) | 2007-01-15 | 2007-12-20 | Impeller for gas compressor and gas compressor with the same |
Publications (1)
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US20090304519A1 true US20090304519A1 (en) | 2009-12-10 |
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ID=39635835
Family Applications (1)
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US12/309,592 Abandoned US20090304519A1 (en) | 2007-01-15 | 2007-12-20 | Gas-Compressor Impeller and Gas Compressor Having The Same |
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Country | Link |
---|---|
US (1) | US20090304519A1 (en) |
EP (1) | EP2105616B1 (en) |
JP (1) | JP4486652B2 (en) |
WO (1) | WO2008087830A1 (en) |
Cited By (2)
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US9355855B2 (en) | 2010-12-01 | 2016-05-31 | Kabushiki Kaisha Toshiba | Plasma etching apparatus component and manufacturing method for the same |
US11162505B2 (en) | 2013-12-17 | 2021-11-02 | Nuovo Pignone Srl | Impeller with protection elements and centrifugal compressor |
Families Citing this family (5)
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CN101749271A (en) * | 2008-12-04 | 2010-06-23 | 上海通用风机股份有限公司 | Wear-resisting centrifugal fan impeller |
DE102009007648A1 (en) * | 2009-02-05 | 2010-08-19 | Siemens Aktiengesellschaft | Method for producing a closed compressor impeller |
JP5787638B2 (en) * | 2011-06-24 | 2015-09-30 | 三菱重工業株式会社 | Impeller machining method |
JP2017180177A (en) * | 2016-03-29 | 2017-10-05 | 三菱重工コンプレッサ株式会社 | Impeller manufacturing method according to thermofusion lamination forming using dissimilar material and impeller |
US11441572B2 (en) * | 2020-08-24 | 2022-09-13 | Hamilton Sundstrand Corporation | Impeller design and manufacturing method with pentagonal channel geometry |
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GB656336A (en) * | 1948-01-19 | 1951-08-22 | Stork Koninklijke Maschf | Improvements in and relating to centrifugal fans |
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GB1140688A (en) * | 1966-02-04 | 1969-01-22 | Turbowerke Meia Ein Veb | Fan impeller of a centrifugal fan for handling dust laden gases |
US3892883A (en) * | 1973-01-19 | 1975-07-01 | Europ Propulsion | Process for plasma spraying fiber-reinforced thermosetting resin laminates |
JPS6098791U (en) * | 1984-07-24 | 1985-07-05 | 株式会社荏原製作所 | impeller |
US4839245A (en) * | 1985-09-30 | 1989-06-13 | Union Carbide Corporation | Zirconium nitride coated article and method for making same |
JPS62119499U (en) * | 1986-01-22 | 1987-07-29 | ||
JP4609391B2 (en) * | 1995-09-20 | 2011-01-12 | 株式会社日立プラントテクノロジー | Manufacturing method of water supply pump |
DE29702099U1 (en) * | 1997-02-07 | 1997-04-17 | Atlas Copco Energas GmbH, 50999 Köln | Impeller for a turbocompressor |
JP2000220085A (en) * | 1999-01-25 | 2000-08-08 | Nippon Yuteku Kk | Extra cushion plate and surface-hardening method therefor |
JP2001107833A (en) * | 1999-10-08 | 2001-04-17 | Toshiba Corp | Hydraulic machine and its manufacturing device |
JP2001200390A (en) | 1999-11-12 | 2001-07-24 | Osaka Gas Co Ltd | Member for compressor |
JP3925849B2 (en) * | 2002-03-18 | 2007-06-06 | 新日本製鐵株式会社 | Sealing treatment method, sealed sprayed coating and fan or blower having the coating |
-
2007
- 2007-01-15 JP JP2007005852A patent/JP4486652B2/en active Active
- 2007-12-20 EP EP07850962.7A patent/EP2105616B1/en active Active
- 2007-12-20 US US12/309,592 patent/US20090304519A1/en not_active Abandoned
- 2007-12-20 WO PCT/JP2007/074527 patent/WO2008087830A1/en active Application Filing
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US4428717A (en) * | 1979-10-29 | 1984-01-31 | Rockwell International Corporation | Composite centrifugal impeller for slurry pumps |
US20060053967A1 (en) * | 2003-12-25 | 2006-03-16 | Hiroaki Mizuno | Thermal spray powder |
US7458765B2 (en) * | 2005-09-23 | 2008-12-02 | Fraunhofer Usa | Diamond hard coating of ferrous substrates |
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US9355855B2 (en) | 2010-12-01 | 2016-05-31 | Kabushiki Kaisha Toshiba | Plasma etching apparatus component and manufacturing method for the same |
US11162505B2 (en) | 2013-12-17 | 2021-11-02 | Nuovo Pignone Srl | Impeller with protection elements and centrifugal compressor |
Also Published As
Publication number | Publication date |
---|---|
EP2105616B1 (en) | 2018-08-22 |
JP4486652B2 (en) | 2010-06-23 |
WO2008087830A9 (en) | 2008-11-27 |
WO2008087830A1 (en) | 2008-07-24 |
EP2105616A1 (en) | 2009-09-30 |
JP2008169799A (en) | 2008-07-24 |
EP2105616A4 (en) | 2014-06-04 |
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