EP2559904A1 - Centrifugal compressor - Google Patents
Centrifugal compressor Download PDFInfo
- Publication number
- EP2559904A1 EP2559904A1 EP10849813A EP10849813A EP2559904A1 EP 2559904 A1 EP2559904 A1 EP 2559904A1 EP 10849813 A EP10849813 A EP 10849813A EP 10849813 A EP10849813 A EP 10849813A EP 2559904 A1 EP2559904 A1 EP 2559904A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- vane blade
- diffuser
- side chamber
- blade
- deformation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/46—Fluid-guiding means, e.g. diffusers adjustable
- F04D29/462—Fluid-guiding means, e.g. diffusers adjustable especially adapted for elastic fluid pumps
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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
- F05D2250/00—Geometry
- F05D2250/50—Inlet or outlet
- F05D2250/52—Outlet
Definitions
- the present invention relates to a centrifugal compressor in which a vane blade is able to be moved into and out of a diffuser passage.
- the diaphragm is formed integrally with the vane blade. Therefore, when the diaphragm is not able to be deformed in an accurate manner because of variation in the thickness of the diaphragm or difference in the hardness of a part of the diaphragm from the others thereof, the direction of protrusion of the vane blade will deviate from a specified direction. When the direction of protrusion of the vane blade deviates from the specified direction, the vane blade may bite a peripheral edge portion of a slit through which the vane blade is caused to protrude into the diffuser passage. In addition, the friction at the time of the vane blade passing through the slit may become large, thus giving rise to wear of the vane blade and an increase in a driving force for operating the vane blade.
- the present invention has been made in view of the above-mentioned circumstances, and has for its object to provide a technique in a centrifugal compressor in which the direction of protrusion of a vane blade is avoided from deviating from a specified direction as a result of a deformation of a deformation member.
- the present invention resides in a centrifugal compressor which is provided with:
- a portion of the deformation member, being in contact with the vane blade is not only displaced in the specified direction to cause the vane blade to protrude into the diffuser passage, but also can be displaced in a direction other than the specified direction, too.
- the vane blade may also move not in the specified direction but in the direction other than the specified direction, in accordance with the deformation of the deformation member.
- the vane blade and the deformation member are separate bodies from each other.
- the displacement in the direction other than the specified direction of the portion of the deformation member in contact with the vane blade only causes the portion of the deformation member in contact with the vane blade to move with respect to the vane blade, but does not act on the vane blade, thus making it difficult for the vane blade to move in a direction other than the specified direction.
- only a displacement in the specified direction of the portion of the deformation member in contact with the vane blade acts on the vane blade, thereby causing the vane blade to move in the specified direction. Accordingly, it is possible to avoid the direction of protrusion of the vane blade from deviating from the specified direction as a result of the deformation of the deformation member.
- the predetermined amount is an amount which, when the amount of protrusion is equal to or less than that amount, can deal with a case where the operation flow rate of the centrifugal compressor is a large flow rate.
- the deformation member in cases where the amount of protrusion of the vane blade into the diffuser passage is equal to or less than the predetermined amount, the deformation member can be caused to separate from the vane blade positioned by the stopper. As a result of this, it is possible to avoid heat transfer from the vane blade to the deformation member. Accordingly, it is possible to suppress the deformation member from being thermally deteriorated resulting from the heat transfer from the vane blade.
- the volume of said anti-diffuser side chamber may be made small until said deformation member and said vane blade positioned by said stopper are separated from each other.
- the centrifugal compressor operates to make air to be supplied at a high flow rate and at a high supercharging pressure
- the air flowing through the diffuser passages becomes a high temperature
- the vane blade which has been caused to be buried into the diffuser passage wall, is similarly at a high temperature.
- the volume of the anti-diffuser side chamber is made small until the deformation member and the vane blade positioned by the stopper are separated from each other, so the deformation member and the vane blade are separated or away from each other, thus making it possible to avoid the heat transfer from the vane blade of the high temperature to the deformation member.
- Fig. 1 is a view showing the schematic construction of a centrifugal compressor according to a first embodiment of the present invention.
- the centrifugal compressor 1 shown in Fig. 1 is provided with a scroll casing 2, and it has an impeller 3 arranged in an axial center inside the scroll casing 2. Air as a gas, which has flowed into the centrifugal compressor 1, is guided to flow into a diffuser passage 5 formed on an outer peripheral side of the impeller 3 by means of vanes 4 which are arranged in a circumferential direction of the impeller 3 at equal intervals.
- the diffuser passage 5 is sandwiched or enclosed by diffuser passage walls, which are part of the scroll casing 2.
- One of the diffuser passage walls on a left-hand side of Fig. 1 is composed of a plate-shaped diffuser plate 6, and is formed separately from a casing main body.
- Space 7, which can be covered with the diffuser plate 6, is formed in the one diffuser passage wall (hereinafter referred to as the diffuser passage wall) on which the diffuser plate 6 is arranged.
- the space 7 is of a hollow cylindrical shape, and can receive a vane blade 8 which is movable into and out of the interior of the diffuser passage 5.
- the vane blade 8 is provided with an annular disk 9, and a plurality of blade portions 10 which have their one ends fixed to the disk 9 and are arranged in a circumferential direction at intervals.
- the diffuser plate 6 is formed with slits 11 into which the blade portions 10 of the vane blade 8 are inserted, respectively. With this construction, when the disk 9 of the vane blade 8 is brought close to the diffuser plate 6, the blade portions 10 of the vane blade 8 protrude from the slits 11, respectively, into the diffuser passage 5.
- a diaphragm 12 as a deformation member, which serves to divide the space 7 into a diffuser side chamber 7a and an anti-diffuser side chamber 7b, and to deform to change the volume of the anti-diffuser side chamber 7b.
- the diaphragm 12 is of an annular shape which can swell or expand in the direction of the diffuser side chamber 7a, and is composed of a rubber-like elastic body so as to be elastically deformable, and has an outer edge and an inner edge both fixedly secured to the wall of the space 7 in an airtight manner.
- the diaphragm 12 can push the disk 9 of the vane blade 8 toward the side of the diffuser passage 5 by being swelled or expanded in a manner such that the anti-diffuser side chamber 7b is made larger.
- the diaphragm 12 and the disk 9 are different bodies from each other. If the diaphragm 12 has not been deformed to swell, the diaphragm 12 and the disk 9 are separated or away from each other. In other words, the diaphragm 12 is able to be moved away from the disk 9 of the vane blade 8 that is positioned by stoppers 13, by decreasing the volume of the anti-diffuser side chamber 7b.
- a compression spring 14 as an urging member, which serves to urge the disk 9 of the vane blade 8 so as to cause the vane blade 8 to be buried in the diffuser passage wall.
- the compression spring 14 is compressed inside the diffuser side chamber 7a, and urges the disk 9 in a direction opposite to the direction of the diffuser passage 5.
- a stopper 13 which serves to position the disk 9 of the vane blade 8 against the urging of the compression spring 14. If the disk 9 abuts against the stoppers 13 in a state urged by the compression springs 14, respectively, so that there will be no action due to the swelling or expanding deformation of the diaphragms 12, the vane blade 8 can be maintained in a state in which it is caused to be buried in the diffuser passage 5.
- the centrifugal compressor 1 of this embodiment is provided with a fluid pressure adjusting mechanism 15 which serves to apply fluid pressure to the anti-diffuser side chamber 7b. Between the fluid pressure adjusting mechanism 15 and the anti-diffuser side chamber 7b, there is arranged a fluid passage 16 which circulates or supply fluid from the fluid pressure adjusting mechanism 15 to the anti-diffuser side chamber 7b.
- Fig. 2 is views showing a protruded state and a buried state of the vane blade according to this embodiment, wherein Fig. 2A shows the protruded state in which the vane blade has been protruded into the diffuser passage, and Fig. 2B shows the buried state in which the vane blade has been buried in the diffuser passage wall.
- the fluid pressure adjusting mechanism 15 causes fluid to flow into the anti-diffuser side chamber 7b thereby to pressurize the anti-diffuser side chamber 7b, so that the diaphragm 12 is caused to perform swelling deformation, thus increasing the volume of the anti-diffuser side chamber 7b.
- the diaphragm 12 is displaced to push the disk 9 of the vane blade 8, so the disk 9 is moved in the specified direction of an illustrated arrow A to cause the blade portions 10 of the vane blade 8 to protrude into the diffuser passage 5, whereby the blade portions 10 of the vane blade 8 are protruded from the slits 11, respectively, into the diffuser passage 5, as shown in Fig. 2(a) .
- Fig. 3 is a view showing a problem of a conventional vane blade.
- a portion of the diaphragm, being in contact with a disk of the vane blade is not only displaced in a specified direction to cause the disk of the vane blade to protrude into a diffuser passage, but also can be displaced in a direction other than the specified direction, too.
- the portion of the diaphragm in contact with the disk of the vane blade as shown in a region C of Fig.
- the vane blade may not move in the specified direction shown by a broken line arrow, in accordance with the swelling deformation of the diaphragm as shown by an arrow B, but may move in a direction other than the specified direction, as shown in the arrow B. If so, the direction of protrusion of the blade portions of the vane blade may deviate from the specified direction, and the blade portions of the vane blade may bite peripheral edge portions of slits to stop moving.
- Fig. 4 is a view showing a feature of the vane blade according to this first embodiment.
- the vane blade 8 and a diaphragm 12 are different or separate bodies from each other, and in a portion shown in a region D of Fig. 4 , the diaphragm 12 is only in contact with the disk 9 of the vane blade 8.
- the fluid pressure adjusting mechanism 15 suck fluid from the anti-diffuser side chamber 7b thereby to reduce the pressure in the anti-diffuser side chamber 7b, so that the diaphragm 12 is caused to perform deflating or retracting deformation, thus decreasing the volume of the anti-diffuser side chamber 7b.
- the disk 9 is urged by means of the compression springs 14 to abut against the stoppers 13 to be positioned thereby, so that the blade portions 10 of the vane blade 8 are respectively buried in the diffuser passage wall, as shown in Fig. 2B .
- the fluid pressure adjusting mechanism 15 operates to make small the volume of the anti-diffuser side chamber 7b until it separates the diaphragm 12 from the disk 9 of the vane blade 8 positioned by the stoppers 13, so that the diaphragm 12 takes a steady shape which is not deformed. For this reason, as shown in Fig. 2B , the diaphragm 12 and the disk 9 of the vane blade 8 positioned by the stoppers 13 are separated or away from each other.
- the centrifugal compressor 1 is operated to make air to be supplied at a high flow rate and at a high supercharging pressure
- the air flowing through the diffuser passage 5 becomes a high temperature of about 180 degrees C
- the vane blade 8, which has been buried in the diffuser passage wall is similarly at a high temperature through the action of the air which flows in from the slits 11.
- the volume of the anti-diffuser side chamber 7b is made small by means of the fluid pressure adjusting mechanism 15 until the diaphragm 12 is separated or away from the disk 9 of the vane blade 8 positioned by the stoppers 13, the diaphragm 12 and the disk 9 of the vane blade 8 are separated or away from each other, thus making it possible to avoid heat transfer from the vane blade 8 of the high temperature to the diaphragm 12.
- the centrifugal compressor 1 operates so as to make air to be supplied at a high flow rate and at a high supercharging pressure, it is possible to suppress the diaphragm 12, which is rubber-like elastic body, from being thermally deteriorated resulting from the heat transfer from the vane blade 8 of the high temperature, thereby making it possible to improve the endurance reliability of the diaphragm 12.
- the centrifugal compressor according to the present invention is not limited to the above-mentioned embodiment, but can be subjected to various changes and modifications within the scope not departing from the gist of the present invention.
- the deformation members there may be used bellows, besides the diaphragms, and as a material therefor, there may also be used resin, metal or the like, besides a rubber-like elastic material.
- the volume of the anti-diffuser side chamber can be made small by continuously reducing fluid pressure by means of the fluid pressure adjusting mechanism.
- the driving force to cause the diaphragm to deform may not be adjusted by fluid pressure supplied by means of the fluid pressure adjusting mechanism.
- the urging members besides the compression springs, there may be used rubber-like elastic bodies, elastic bodies using resin, or the like, in addition to tension springs.
- the stoppers position the vane blade against the urging of the compression springs there may not only be a case where the vane blade is in a position in which it is buried in the diffuser passage wall, but also a case where the amount of protrusion of the vane blade into the diffuser passage is equal to or less than a predetermined amount.
- the predetermined amount is an amount which, when the amount of protrusion is equal to or less than that amount, can deal with a case where the operation flow rate of the centrifugal compressor is a large flow rate.
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Abstract
Description
- The present invention relates to a centrifugal compressor in which a vane blade is able to be moved into and out of a diffuser passage.
- There has been disclosed a technique in which a vane blade is formed integrally with a diaphragm, and fluid pressure inside the diaphragm is adjusted to deform the diaphragm, so that the deformation of the diaphragm is transmitted to the vane blade, thereby causing the vane blade to move into and out of the diffuser passage (see, for example, a first patent document). With this construction, in the first patent document, when the operation flow rate of a centrifugal compressor is a small flow rate, the vane blade is caused to project into the diffuser passage, whereas when the operation flow rate of the centrifugal compressor is a large flow rate, the vane blade is caused to be buried into the side wall of the diffuser passage.
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- [First patent Document] Patent Laid-Open Publication No.
2001-329996 - In the technique of the first patent document, the diaphragm is formed integrally with the vane blade. Therefore, when the diaphragm is not able to be deformed in an accurate manner because of variation in the thickness of the diaphragm or difference in the hardness of a part of the diaphragm from the others thereof, the direction of protrusion of the vane blade will deviate from a specified direction. When the direction of protrusion of the vane blade deviates from the specified direction, the vane blade may bite a peripheral edge portion of a slit through which the vane blade is caused to protrude into the diffuser passage. In addition, the friction at the time of the vane blade passing through the slit may become large, thus giving rise to wear of the vane blade and an increase in a driving force for operating the vane blade.
- The present invention has been made in view of the above-mentioned circumstances, and has for its object to provide a technique in a centrifugal compressor in which the direction of protrusion of a vane blade is avoided from deviating from a specified direction as a result of a deformation of a deformation member.
- In the present invention, the following construction is adopted. That is, the present invention resides in a centrifugal compressor which is provided with:
- a vane blade that is movable into and out of a diffuser passage;
- a space that is formed in a wall of the diffuser passage in which said vane blade is caused to be buried;
and - a deformation member that divides said space into a diffuser side chamber and an anti-diffuser side chamber, and deforms to change the volume of said anti-diffuser side chamber, said deformation member causing said vane blade to move in a specified direction thereby to protrude into said diffuser passage due to a deformation thereof at the time of increasing the volume of said anti-diffuser side chamber;
- wherein said vane blade and said deformation member are separate bodies from each other, and only a displacement in the specified direction of a portion of said deformation member which is made into contact with said vane blade due to the deformation thereof at the time of increasing the volume of said anti-diffuser side chamber acts on said vane blade.
- In the deformation of the deformation member at the time of increasing the volume of the anti-diffuser side chamber, a portion of the deformation member, being in contact with the vane blade, is not only displaced in the specified direction to cause the vane blade to protrude into the diffuser passage, but also can be displaced in a direction other than the specified direction, too. At this time, when the portion of the deformation member, which is in contact with the vane blade, is formed integrally with the vane blade, the vane blade may also move not in the specified direction but in the direction other than the specified direction, in accordance with the deformation of the deformation member.
- However, in the present invention, the vane blade and the deformation member are separate bodies from each other. For this reason, the displacement in the direction other than the specified direction of the portion of the deformation member in contact with the vane blade only causes the portion of the deformation member in contact with the vane blade to move with respect to the vane blade, but does not act on the vane blade, thus making it difficult for the vane blade to move in a direction other than the specified direction. On the other hand, only a displacement in the specified direction of the portion of the deformation member in contact with the vane blade acts on the vane blade, thereby causing the vane blade to move in the specified direction. Accordingly, it is possible to avoid the direction of protrusion of the vane blade from deviating from the specified direction as a result of the deformation of the deformation member.
- As a result, it is possible to avoid the direction of protrusion of the vane blade from deviating from the specified direction, thus avoiding the vane blade from biting a peripheral edge portion of a slit through which the vane blade is caused to protrude into the diffuser passage. In addition, it is also possible to avoid friction at the time of the vane blade passing through the slit from becoming large, thereby avoiding the occurrence of wear of the vane blade and an increase in a driving force for operating the vane blade.
- Provision may further be made for:
- an urging member that urges said vane blade in a manner such that said vane blade is caused to be buried into said diffuser passage wall; and
- a stopper that positions said vane blade against the urging of said urging member when an amount of protrusion into said diffuser passage of said vane blade is equal to or less than a predetermined amount;
- wherein said deformation member is able to be moved away from said vane blade that is positioned by said stopper, by decreasing the volume of said anti-diffuser side chamber.
- Here, the predetermined amount is an amount which, when the amount of protrusion is equal to or less than that amount, can deal with a case where the operation flow rate of the centrifugal compressor is a large flow rate.
- According to this, in cases where the amount of protrusion of the vane blade into the diffuser passage is equal to or less than the predetermined amount, the deformation member can be caused to separate from the vane blade positioned by the stopper. As a result of this, it is possible to avoid heat transfer from the vane blade to the deformation member. Accordingly, it is possible to suppress the deformation member from being thermally deteriorated resulting from the heat transfer from the vane blade.
- In cases where the centrifugal compressor operates so as to make air to be supplied at a high flow rate and at a high supercharging pressure, the volume of said anti-diffuser side chamber may be made small until said deformation member and said vane blade positioned by said stopper are separated from each other.
- In cases where the centrifugal compressor operates to make air to be supplied at a high flow rate and at a high supercharging pressure, the air flowing through the diffuser passages becomes a high temperature, and the vane blade, which has been caused to be buried into the diffuser passage wall, is similarly at a high temperature. In this case, the volume of the anti-diffuser side chamber is made small until the deformation member and the vane blade positioned by the stopper are separated from each other, so the deformation member and the vane blade are separated or away from each other, thus making it possible to avoid the heat transfer from the vane blade of the high temperature to the deformation member. Accordingly, in cases where the centrifugal compressor operates to make air to be supplied at a high flow rate and at a high supercharging pressure, it is possible to suppress the deformation member from being thermally deteriorated resulting from the heat transfer from the vane blade of the high temperature.
- According to the present invention, in a centrifugal compressor, it is possible to avoid the direction of protrusion of a vane blade from deviating from a specified direction as a result of a deformation of a deformation member.
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- [
Fig. 1 ] is a view showing the schematic construction of a centrifugal compressor according to a first embodiment of the present invention. - [
Fig. 2 ] is views showing a protruded state and a buried state of a vane blade according to the first embodiment. - [
Fig. 3 ] is a view showing a problem of a conventional vane blade. - [
Fig. 4 ] is a view showing a feature of the vane blade according to the first embodiment. - Hereinafter, a specific embodiment of the present invention will be described.
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Fig. 1 is a view showing the schematic construction of a centrifugal compressor according to a first embodiment of the present invention. Thecentrifugal compressor 1 shown inFig. 1 is provided with a scroll casing 2, and it has animpeller 3 arranged in an axial center inside the scroll casing 2. Air as a gas, which has flowed into thecentrifugal compressor 1, is guided to flow into adiffuser passage 5 formed on an outer peripheral side of theimpeller 3 by means ofvanes 4 which are arranged in a circumferential direction of theimpeller 3 at equal intervals. - The
diffuser passage 5 is sandwiched or enclosed by diffuser passage walls, which are part of the scroll casing 2. One of the diffuser passage walls on a left-hand side ofFig. 1 is composed of a plate-shaped diffuser plate 6, and is formed separately from a casing main body.Space 7, which can be covered with thediffuser plate 6, is formed in the one diffuser passage wall (hereinafter referred to as the diffuser passage wall) on which thediffuser plate 6 is arranged. Thespace 7 is of a hollow cylindrical shape, and can receive avane blade 8 which is movable into and out of the interior of thediffuser passage 5. - The
vane blade 8 is provided with anannular disk 9, and a plurality ofblade portions 10 which have their one ends fixed to thedisk 9 and are arranged in a circumferential direction at intervals. Thediffuser plate 6 is formed withslits 11 into which theblade portions 10 of thevane blade 8 are inserted, respectively. With this construction, when thedisk 9 of thevane blade 8 is brought close to thediffuser plate 6, theblade portions 10 of thevane blade 8 protrude from theslits 11, respectively, into thediffuser passage 5. On the other hand, when thedisk 9 of thevane blade 8 is moved away from the diffuser plate 6 (the diffuser passage 5), theblade portions 10 are received in thespace 7 while being guided by theslits 11, respectively, so that thevane blade 8 is buried or drawn in the diffuser passage wall. - In the
space 7 where thevane blade 8 is received, there is arranged adiaphragm 12, as a deformation member, which serves to divide thespace 7 into adiffuser side chamber 7a and ananti-diffuser side chamber 7b, and to deform to change the volume of theanti-diffuser side chamber 7b. Thediaphragm 12 is of an annular shape which can swell or expand in the direction of thediffuser side chamber 7a, and is composed of a rubber-like elastic body so as to be elastically deformable, and has an outer edge and an inner edge both fixedly secured to the wall of thespace 7 in an airtight manner. Thediaphragm 12 can push thedisk 9 of thevane blade 8 toward the side of thediffuser passage 5 by being swelled or expanded in a manner such that theanti-diffuser side chamber 7b is made larger. Thediaphragm 12 and thedisk 9 are different bodies from each other. If thediaphragm 12 has not been deformed to swell, thediaphragm 12 and thedisk 9 are separated or away from each other. In other words, thediaphragm 12 is able to be moved away from thedisk 9 of thevane blade 8 that is positioned bystoppers 13, by decreasing the volume of theanti-diffuser side chamber 7b. - In the
diffuser side chamber 7a in thespace 7, there is arranged acompression spring 14, as an urging member, which serves to urge thedisk 9 of thevane blade 8 so as to cause thevane blade 8 to be buried in the diffuser passage wall. Thecompression spring 14 is compressed inside thediffuser side chamber 7a, and urges thedisk 9 in a direction opposite to the direction of thediffuser passage 5. - In a position in which the
compression spring 14 in thediffuser side chamber 7a urges thedisk 9 of thevane blade 8 thereby to cause thevane blade 8 to be buried in the diffuser passage wall, there is arranged astopper 13 which serves to position thedisk 9 of thevane blade 8 against the urging of thecompression spring 14. If thedisk 9 abuts against thestoppers 13 in a state urged by the compression springs 14, respectively, so that there will be no action due to the swelling or expanding deformation of thediaphragms 12, thevane blade 8 can be maintained in a state in which it is caused to be buried in thediffuser passage 5. - The
centrifugal compressor 1 of this embodiment is provided with a fluidpressure adjusting mechanism 15 which serves to apply fluid pressure to theanti-diffuser side chamber 7b. Between the fluidpressure adjusting mechanism 15 and theanti-diffuser side chamber 7b, there is arranged afluid passage 16 which circulates or supply fluid from the fluidpressure adjusting mechanism 15 to theanti-diffuser side chamber 7b. -
Fig. 2 is views showing a protruded state and a buried state of the vane blade according to this embodiment, whereinFig. 2A shows the protruded state in which the vane blade has been protruded into the diffuser passage, andFig. 2B shows the buried state in which the vane blade has been buried in the diffuser passage wall. - In cases where the
centrifugal compressor 1 operates so as to cause air to be supplied at a low flow rate and at a low supercharging pressure, the fluidpressure adjusting mechanism 15 causes fluid to flow into theanti-diffuser side chamber 7b thereby to pressurize theanti-diffuser side chamber 7b, so that thediaphragm 12 is caused to perform swelling deformation, thus increasing the volume of theanti-diffuser side chamber 7b. As a result of this, thediaphragm 12 is displaced to push thedisk 9 of thevane blade 8, so thedisk 9 is moved in the specified direction of an illustrated arrow A to cause theblade portions 10 of thevane blade 8 to protrude into thediffuser passage 5, whereby theblade portions 10 of thevane blade 8 are protruded from theslits 11, respectively, into thediffuser passage 5, as shown inFig. 2(a) . -
Fig. 3 is a view showing a problem of a conventional vane blade. Here, in the swelling deformation of a diaphragm at the time of increasing the volume of an anti-diffuser side chamber, a portion of the diaphragm, being in contact with a disk of the vane blade, is not only displaced in a specified direction to cause the disk of the vane blade to protrude into a diffuser passage, but also can be displaced in a direction other than the specified direction, too. At this time, if the portion of the diaphragm in contact with the disk of the vane blade as shown in a region C ofFig. 3 is formed integrally with the vane blade, the vane blade may not move in the specified direction shown by a broken line arrow, in accordance with the swelling deformation of the diaphragm as shown by an arrow B, but may move in a direction other than the specified direction, as shown in the arrow B. If so, the direction of protrusion of the blade portions of the vane blade may deviate from the specified direction, and the blade portions of the vane blade may bite peripheral edge portions of slits to stop moving. In addition, even if the blade portions of the vane blade do not bite, they may be rubbed against the peripheral edge portions of the slits, and friction at that time may become large, thus giving rise to an increase in wear of the blade portions of the vane blade or an increase in the driving forces of a fluid pressure adjusting mechanism. -
Fig. 4 is a view showing a feature of the vane blade according to this first embodiment. In this embodiment, thevane blade 8 and adiaphragm 12 are different or separate bodies from each other, and in a portion shown in a region D ofFig. 4 , thediaphragm 12 is only in contact with thedisk 9 of thevane blade 8. For this reason, even in cases where thediaphragm 12 is deformed in a direction of the arrow B other than the specified direction, such a displacement in a direction other than the specified direction of the portion of thediaphragm 12 in contact with thevane blade 8 only causes the portion of thediaphragm 12 in contact with thedisk 9 of thevane blade 8 to move in position (shift in position) with respect to thevane blade 8, but does not act on thevane blade 8, thus making it difficult for thevane blade 8 to move in a direction other than the specified direction. On the other hand, only a displacement in the specified direction of the portion of thediaphragm 12 in contact with thedisk 9 of thevane blade 8 acts on thevane blade 8, so that thevane blade 8 is caused to move in the specified direction of the illustrated arrow A. Accordingly, in the present embodiment, it is possible to avoid the direction of protrusion of ablade portion 10 of thevane blade 8 from deviating from the specified direction as a result of the deformation of thediaphragm 12. - As a result, it is possible to avoid the direction of protrusion of the
blade portions 10 of thevane blade 8 from deviating from the specified direction, thus avoiding theblade portions 10 of thevane blade 8 from biting the peripheral edge portions of theslits 11 to stop moving. In addition, it is also possible to avoid theblade portions 10 of thevane blade 8 from being rubbed against the peripheral edge portions of theslits 11 at the time of theblade portions 10 passing through theslits 11, respectively, and hence, friction at that time from becoming large, thereby avoiding the occurrence of wear of theblade portions 10 of thevane blade 8 and an increase in the driving forces of the fluidpressure adjusting mechanism 15. - On the other hand, in cases where the
centrifugal compressor 1 operates so as to make air to be supplied at a high flow rate and at a high supercharging pressure, the fluidpressure adjusting mechanism 15 suck fluid from theanti-diffuser side chamber 7b thereby to reduce the pressure in theanti-diffuser side chamber 7b, so that thediaphragm 12 is caused to perform deflating or retracting deformation, thus decreasing the volume of theanti-diffuser side chamber 7b. As a result of this, a force from thediaphragm 12 to cause thevane blade 8 to move in the specified direction to protrude into thediffuser passage 5 stop acting thereon. Then, thedisk 9 is urged by means of the compression springs 14 to abut against thestoppers 13 to be positioned thereby, so that theblade portions 10 of thevane blade 8 are respectively buried in the diffuser passage wall, as shown inFig. 2B . - At this time, the fluid
pressure adjusting mechanism 15 operates to make small the volume of theanti-diffuser side chamber 7b until it separates thediaphragm 12 from thedisk 9 of thevane blade 8 positioned by thestoppers 13, so that thediaphragm 12 takes a steady shape which is not deformed. For this reason, as shown inFig. 2B , thediaphragm 12 and thedisk 9 of thevane blade 8 positioned by thestoppers 13 are separated or away from each other. Here, in cases where thecentrifugal compressor 1 is operated to make air to be supplied at a high flow rate and at a high supercharging pressure, the air flowing through thediffuser passage 5 becomes a high temperature of about 180 degrees C, and thevane blade 8, which has been buried in the diffuser passage wall, is similarly at a high temperature through the action of the air which flows in from theslits 11. In this case, because the volume of theanti-diffuser side chamber 7b is made small by means of the fluidpressure adjusting mechanism 15 until thediaphragm 12 is separated or away from thedisk 9 of thevane blade 8 positioned by thestoppers 13, thediaphragm 12 and thedisk 9 of thevane blade 8 are separated or away from each other, thus making it possible to avoid heat transfer from thevane blade 8 of the high temperature to thediaphragm 12. Accordingly, in cases where thecentrifugal compressor 1 operates so as to make air to be supplied at a high flow rate and at a high supercharging pressure, it is possible to suppress thediaphragm 12, which is rubber-like elastic body, from being thermally deteriorated resulting from the heat transfer from thevane blade 8 of the high temperature, thereby making it possible to improve the endurance reliability of thediaphragm 12. - The centrifugal compressor according to the present invention is not limited to the above-mentioned embodiment, but can be subjected to various changes and modifications within the scope not departing from the gist of the present invention. For example, as the deformation members, there may be used bellows, besides the diaphragms, and as a material therefor, there may also be used resin, metal or the like, besides a rubber-like elastic material. In addition, at the time when the diaphragm is separated or away from the disk of the vane blade positioned by the stoppers, the volume of the anti-diffuser side chamber can be made small by continuously reducing fluid pressure by means of the fluid pressure adjusting mechanism. The driving force to cause the diaphragm to deform may not be adjusted by fluid pressure supplied by means of the fluid pressure adjusting mechanism. As the urging members, besides the compression springs, there may be used rubber-like elastic bodies, elastic bodies using resin, or the like, in addition to tension springs. As the case where the stoppers position the vane blade against the urging of the compression springs, there may not only be a case where the vane blade is in a position in which it is buried in the diffuser passage wall, but also a case where the amount of protrusion of the vane blade into the diffuser passage is equal to or less than a predetermined amount. Here, the predetermined amount is an amount which, when the amount of protrusion is equal to or less than that amount, can deal with a case where the operation flow rate of the centrifugal compressor is a large flow rate.
-
- 1: centrifugal compressor
- 2: scroll casing
- 3: impeller
- 4: vanes
- 5: diffuser passage
- 6: diffuser plate
- 7: space
- 7a: diffuser side chamber
- 7b: anti-diffuser side chamber
- 8: vane blade
- 9: disk
- 10: blade portions
- 11: slits
- 12: diaphragm
- 13: stoppers
- 14: compression springs
- 15: fluid pressure adjusting mechanism
- 16: flow passage
Claims (3)
- A centrifugal compressor comprising:a vane blade that is movable into and out of a diffuser passage;a space that is formed in a wall of the diffuser passage to allow said vane blade to be buried therein; anda deformation member that divides said space into a diffuser side chamber and an anti-diffuser side chamber, and deforms to change the volume of said anti-diffuser side chamber, said deformation member causing said vane blade to move in a specified direction thereby to protrude into said diffuser passage due to a deformation thereof at the time of increasing the volume of said anti-diffuser side chamber;wherein said vane blade and said deformation member are separate bodies from each other, and only a displacement in the specified direction of a portion of said deformation member which is made into contact with said vane blade due to the deformation thereof at the time of increasing the volume of said anti-diffuser side chamber acts on said vane blade.
- The centrifugal compressor as set forth in claim 1, further comprising:an urging member that urges said vane blade in a manner such that said vane blade is caused to be buried into said diffuser passage wall; anda stopper that positions said vane blade against the urging of said urging member when an amount of protrusion into said diffuser passage of said vane blade is equal to or less than a predetermined amount;wherein said deformation member is able to be moved away from said vane blade that is positioned by said stopper, by decreasing the volume of said anti-diffuser side chamber.
- The centrifugal compressor as set forth in claim 2, wherein
in cases where the centrifugal compressor operates so as to make air to be supplied at a high flow rate and at a high supercharging pressure, the volume of said anti-diffuser side chamber is made small until said deformation member and said vane blade positioned by said stopper are separated from each other.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2010/056595 WO2011128975A1 (en) | 2010-04-13 | 2010-04-13 | Centrifugal compressor |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2559904A1 true EP2559904A1 (en) | 2013-02-20 |
EP2559904A4 EP2559904A4 (en) | 2014-12-10 |
EP2559904B1 EP2559904B1 (en) | 2016-11-23 |
Family
ID=44798368
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10849813.0A Not-in-force EP2559904B1 (en) | 2010-04-13 | 2010-04-13 | Centrifugal compressor |
Country Status (3)
Country | Link |
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EP (1) | EP2559904B1 (en) |
JP (1) | JP5348316B2 (en) |
WO (1) | WO2011128975A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107642506A (en) * | 2017-10-24 | 2018-01-30 | 珠海格力电器股份有限公司 | Regulator structure and centrifugal compressor with same |
CN109356886A (en) * | 2018-12-17 | 2019-02-19 | 珠海格力电器股份有限公司 | Centrifugal compressor and diffuser device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001329996A (en) * | 2000-05-24 | 2001-11-30 | Ishikawajima Harima Heavy Ind Co Ltd | Centrifugal compressor with variable diffuser and its control method |
DE102006009354A1 (en) * | 2006-03-01 | 2007-09-06 | Bayerische Motoren Werke Ag | Centrifuge compressor, for a turbocharger, has a hollow elastic body to give a wide adjustment of the flow cross section surface of the diffuser |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4333047B2 (en) * | 2001-01-12 | 2009-09-16 | 株式会社豊田自動織機 | Control valve for variable capacity compressor |
JP3818142B2 (en) * | 2001-12-13 | 2006-09-06 | 石川島播磨重工業株式会社 | Centrifugal compressor |
-
2010
- 2010-04-13 WO PCT/JP2010/056595 patent/WO2011128975A1/en active Application Filing
- 2010-04-13 EP EP10849813.0A patent/EP2559904B1/en not_active Not-in-force
- 2010-04-13 JP JP2012510493A patent/JP5348316B2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001329996A (en) * | 2000-05-24 | 2001-11-30 | Ishikawajima Harima Heavy Ind Co Ltd | Centrifugal compressor with variable diffuser and its control method |
DE102006009354A1 (en) * | 2006-03-01 | 2007-09-06 | Bayerische Motoren Werke Ag | Centrifuge compressor, for a turbocharger, has a hollow elastic body to give a wide adjustment of the flow cross section surface of the diffuser |
Non-Patent Citations (1)
Title |
---|
See also references of WO2011128975A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2559904A4 (en) | 2014-12-10 |
JPWO2011128975A1 (en) | 2013-07-11 |
WO2011128975A1 (en) | 2011-10-20 |
JP5348316B2 (en) | 2013-11-20 |
EP2559904B1 (en) | 2016-11-23 |
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