JP2010216373A - Inlet guide vane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inlet guide vane capable of improving assemblability of guide vane members while emitting a straightening body required in conventional examples. <P>SOLUTION: The inlet guide vane 14 for adjusting air flow flowing in a compressor of a turbo supercharger includes plate-like vane parts 59 for opening and closing an air passage 39 in which air flows, and a plurality of guide vane members 32 having shaft parts 56 provided rotatably around the axes and extending in the radial direction with respect to a passage wall part 38 of the air passage 39. The vane parts 59 of the guide vane members 32 are offset in the radial direction of the axes of the shaft parts 56. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an inlet guide vane used mainly for an internal combustion engine mounted on an automobile, a so-called supercharger of an engine.

An inlet guide vane for a supercharger of an engine mounted on an automobile is arranged on the upstream side of the compressor in the supercharger and adjusts the air flow flowing through the compressor. As a conventional example of this type of inlet guide vane, there is one described in Patent Document 1, for example. FIG. 13 is a cross-sectional view showing the inlet guide vane.
As shown in FIG. 13, an inlet guide vane (corresponding to “air flow swirl mechanism” in Patent Document 1) 200 is concentric with a compressor wheel (“impeller”) 202 in a casing 201 of a supercharger. A plurality (two in FIG. 13) of guide vane members 205 are provided on the wall 204 of the air inlet 203 so as to be openable and closable. In addition, the guide vane member 205 includes a shaft portion 206 provided to be rotatable about a radial axis with respect to the wall portion 204 of the air inlet 203, and a vane portion integrally provided on the shaft portion 206. Guide vanes ”) 207. Further, a rectifier 208 is provided between the central portion of the air inlet 203, that is, between the vane portions 207 of the plurality of guide vane members 205. The rectifier 208 is supported in the air inlet 203 by a support plate 209.

JP 10-339152 A

In the conventional example, when the guide vane member 205 is assembled, the shaft portion 206 of the guide vane member 205 is assembled radially outward from the center side of the air inlet 203 with respect to the wall portion 204 of the air inlet 203. Attached. Further, the shaft portion 206 and the vane portion 207 of the guide vane member 205 are formed on the same axis line 205L. Therefore, after the first guide vane member 205 is assembled to the wall portion 204, the vane portion 207 of the guide vane member 205 attached later easily interferes with the vane portion 207 of the guide vane member 205. There was a problem of poor assembly. Further, in order to avoid interference between the vane portions 207 of the guide vane member 205, the axial length of the vane portion 207 (vertical length in FIG. 13) must be shortened. After the assembly is completed, a space portion is formed between the central portion of the air inlet 203, that is, between the opposed vane portions 207. Since this space portion serves as an escape route for air, there is a problem that the rectifier 208 is required to close the space portion.
The problem to be solved by the present invention is to provide an inlet guide vane that can improve the assemblability of the guide vane member while omitting the rectifying member required in the conventional example.

The above-mentioned subject can be solved by an inlet guide vane which makes a summary the composition indicated in each claim of a claim.
That is, according to the inlet guide vane described in claim 1, the vane portion of the guide vane member is offset in the radial direction of the axis of the shaft portion. Therefore, when assembling the guide vane member to the air passage forming member, the vane portions are directed in the direction along the axial direction of the air passage and the opposing vane portions are combined in a notch shape, thereby interfering with the vane portions. Can be avoided. At the same time, the length of the vane portion in the axial direction can be set long, and the space portion serving as an air escape path can be narrowed. For this reason, the assembly | attachment property of a guide vane member can be improved, omitting the rectifier required by the prior art example.

  According to the inlet guide vane described in claim 2, in the vane portion of the guide vane member, the upstream half directed toward the upstream side of the air passage and the downstream half directed toward the downstream side thereof are asymmetrical. Is formed. Therefore, the aerodynamic center with respect to the upstream half part and downstream half part of a vane part can be shifted. For this reason, for example, resonance of flutter or the like of the vane portion can be prevented by shifting the aerodynamic center with respect to the vane portion to the downstream side.

  According to the inlet guide vane described in claim 3, when the guide vane member is closed, the closed position is set at the near side position where the vane portion is located on a plane perpendicular to the axis of the air passage. Therefore, at the closed position of the guide vane member, a predetermined air flow rate can be obtained while turning the air flow into a swirl flow.

  According to the inlet guide vane described in claim 4, the guide vane member is driven to open and close by the pressure actuator. Therefore, the guide vane member can be driven to open and close using a pressure actuator that is generally inexpensive and has good mountability on the vehicle.

  According to the inlet guide vane described in claim 5, the housing portion of the actuator for opening and closing the guide vane member and the passage wall portion of the air passage are integrally formed of resin. Therefore, the number of parts and the number of assembly steps can be reduced. Further, by using a resin material, the surface roughness of the passage wall surface of the air passage can be easily reduced as compared with a metal material. The housing part integrally formed with the passage forming member may be any part that forms at least a part of the housing of the actuator.

It is the schematic which shows the turbocharger which concerns on one Example. It is a perspective view which shows an inlet guide vane. It is a front view which shows an inlet guide vane. It is a left view which shows an inlet guide vane. It is a right view which shows an inlet guide vane partially broken. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 3. FIG. 7 is a sectional view taken along line VII-VII in FIG. 5. It is a front view which shows an inlet guide vane in an open state. It is a perspective view which decomposes | disassembles and shows the resin-made members containing a body main body. It is a front view which shows a guide vane member. It is a left view which shows a guide vane member. It is a top view which shows a guide vane member. It is sectional drawing which shows the inlet guide vane which concerns on a prior art example.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

An embodiment of the present invention will be described. In this embodiment, an inlet guide vane used in a turbocharger for an automobile engine is illustrated. For convenience of explanation, after explaining the outline of the turbocharger, the inlet guide vane will be explained. FIG. 1 is a schematic view showing a turbocharger.
As shown in FIG. 1, the turbocharger 10 includes a turbocharger 12 and an inlet guide vane 14. The turbocharger 12 includes a compressor 16 and a turbine 17. The compressor 16 is interposed in the intake passage 20 of the automobile engine 19. The turbine 17 is interposed in the middle of the exhaust passage 21 of the engine 19. A compressor wheel 23 rotatably provided in the compressor 16 and a turbine wheel 24 rotatably provided in the turbine 17 are connected coaxially by a shaft 25. As the turbine wheel 24 is rotated by the exhaust gas flowing through the exhaust passage 21 of the engine 19, the compressor wheel 23 is rotated. As a result, the air (intake air) flowing through the intake passage 20 is compressed to be increased in pressure and supplied into the combustion chamber 27 of the engine 19. Further, the inlet guide vane 14 adjusts the air flow flowing through the compressor 16 in the turbocharger 12.

Next, the inlet guide vane 14 will be described. 2 is a perspective view showing the inlet guide vane, FIG. 3 is also a front view, FIG. 4 is a left side view, FIG. 5 is a right side view, and FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 5, FIG. 8 is a front view showing the inlet guide vane in an open state, and FIG. 9 is an exploded perspective view showing a resin member including the body body. .
As shown in FIG. 2, the inlet guide vane 14 includes a body main body 30 (see FIG. 9), a guide vane member 32, an interlocking mechanism 34, and an actuator 36. For convenience of explanation, the top, bottom, left, and right are determined with reference to FIG.

  As shown in FIG. 9, the body main body 30 is made of, for example, resin and has a passage wall portion 38 that forms a hollow cylindrical air passage 39 penetrating in the front-rear direction. A front flange portion 41 is formed at the front end portion of the passage wall portion 38 so as to project to the outer periphery (see FIG. 6). Further, a plurality of rear flange portions 42 (three are shown in FIG. 6) projecting to the outer periphery are formed in parallel in the front-rear direction (vertical direction in FIG. 6) at the rear end portion of the passage wall portion 38. ing. An annular groove 43 is formed between the adjacent rear flange portions 42. Further, between the front flange portion 41 and the rear flange portion 42 in the foremost row, the outer peripheral surface of the passage wall portion 38 has a plurality of cylindrical shapes (in the present embodiment, a total of four, upper, lower, left and right are shown). The bearing boss portions 45 are formed at equal intervals (that is, at intervals of 90 °) (see FIGS. 7 and 9). A shaft hole 46 is formed in the bearing boss 45 and penetrates the passage wall 38 in the radial direction.

  Between the front flange portion 41 and the rear flange portion 42 in the foremost row, a pair of left and right mounting portions 48 projecting in the form of projecting pieces outwardly in the radial direction are formed on the outer peripheral surface of the passage wall portion 38. It is formed (see FIGS. 2 and 9). The left mounting portion 48 is disposed between the left bearing boss portion 45 and the upper bearing boss portion 45, and the right mounting portion 48 is formed between the right bearing boss portion 45 and the lower bearing boss portion 45. (See FIG. 7). Both mounting portions 48 are formed with bolt insertion holes 49 penetrating in the front-rear direction. The front end surfaces of both attachment portions 48 are flush with the front end surface of the passage wall portion 38 (including the front flange portion 41) (see FIG. 3). Further, the rear end surface of the right mounting portion 48 is close to the front end surface of the rear flange portion 42 in the foremost row with a predetermined gap (see FIG. 6). A guide surface 51 is formed on the outer peripheral portion of the body 30 so as to be flush with the rear end surface of the right mounting portion 48 (see FIGS. 4, 5, and 9). Further, a lower cover portion 54 is integrally formed on the right shoulder portion of the passage wall portion 38 via a columnar arm portion 53 (see FIG. 9). The lower cover portion 54 is formed in a bottomed cylindrical shape. The body body 30 is integrally formed of resin including the lower cover portion 54 and the arm portion 53. That is, the body main body 30 is an integrally molded product by resin molding. The lower cover portion 54 corresponds to an “actuator housing portion” in this specification. Further, the passage wall portion 38 of the body main body 30 corresponds to an “air passage forming member” in this specification.

As shown in FIG. 7, a total of four guide vane members 32 are provided on each bearing boss portion 45 of the body main body 30 so as to be openable and closable by rotation. 10 is a front view showing the guide vane member, FIG. 11 is a left side view, and FIG. 12 is a plan view.
As shown in FIG. 10, the guide vane member 32 is made of, for example, resin, and includes a shaft portion 56 having a head portion 57 at one end, and a triangular plate-like vane portion 59 integrally formed on the head portion 57. Have. A dihedral width portion 61 is formed at the distal end portion (lower end portion in FIG. 10) of the shaft portion 56 (see FIG. 11). Further, the vane portion 59 is offset in the radial direction with respect to the axis 56 </ b> L of the shaft portion 56. That is, the offset amount f1 is set between the axis 56L of the shaft portion 56 and the central surface 59a of the plate thickness 59t of the vane portion 59 (see FIGS. 11 and 12). The offset amount f1 is, for example, 1/2 ± α of the plate thickness 59t of the vane portion 59.
Further, the top portion 59b of the vane portion 59 is set on a plane 59c orthogonal to the center plane 59a of the plate thickness 59t and passing through the axis 56L of the shaft portion 56 or at a position close to the plane 59c (FIGS. 10 and 10). (See FIG. 12). The vane portion 59 is formed in an asymmetric shape with respect to the plane 59c (see FIG. 10). That is, it is formed so that the area (vertical angle) of the remaining half piece 64 is larger than the area (vertical angle) of the half piece 63 centered on the plane 59c.
The bottom 59 d of the vane portion 59 is formed in an arc shape corresponding to the passage wall surface of the air passage 39.

  The shaft portion 56 of the guide vane member 32 is assembled to the shaft hole 46 of the passage wall portion 38 by insertion from the center portion side of the air passage 39. Then, the shaft portion 56 of the guide vane member 32 is sequentially inserted into each shaft hole 46. When assembling the guide vane members 32, the vane portions 59 of the guide vane members 32 are oriented in the direction along the axial direction of the air passage 39 (see FIG. 8). That is, the half area 63 on the small area side of the vane portion 59 is directed forward (upstream side, front side in FIG. 8), and the half area 64 on the large area side is rearward (downstream side, rear side in FIG. 8). ). Thus, by combining the opposing vane portions 59 in a cut-out shape, interference between the vane portions 59 can be avoided (see the two-dot chain line 59 in FIG. 8). Further, in a state where the shaft portion 56 of the guide vane member 32 is inserted into the shaft hole 46, the head portion 57 contacts or approaches the passage wall surface of the air passage 39.

  As shown in FIGS. 6 and 7, the shaft portions 56 of the guide vane members 32 are rotatably supported in the bearing boss portions 45 through bearings 66, respectively. A seal member 68 made of an oil seal that seals between the bearing boss portion 45 and the shaft portion 56 is provided in the outer end portion of each bearing boss portion 45. Further, the vane portion 59 has an air passage in a state in which the small half portion 63 on the small area side is directed forward (downward in FIG. 6) and the large half portion 64 is directed rearward (upward in FIG. 6). A state along the axial direction of 39 is set to an open position (fully open position) (see a two-dot chain line 59 in FIG. 6). For this reason, the small half-side 63 is referred to as the upstream half 63, and the large-area single half 64 is referred to as the downstream half 64.

  Further, a closed position (fully closed position) is set at a near side position where the vane portion 59 is located on a plane orthogonal to the axis 39L (see FIG. 6) of the air passage 39, specifically, at an 80 ° position from the open position. (See the solid line 59 in FIG. 6). In the present embodiment, the counterclockwise direction (see the arrow Y1 in FIGS. 4 and 5) is opened toward the end surface of the shaft portion 56 of the guide vane member 32 (the end surface on the two-surface width portion 61 side) in the closed position. In the open position, the clockwise direction (see arrow Y2 in FIGS. 4 and 5) is the closing direction. Although not shown, a stopper mechanism is provided that defines the closed position and / or the open position of the guide vane member 32 by mutual contact between the fixed side member and the movable side member. 2 to 7 show the closed state of the guide vane member 32 by a solid line, and FIG. 8 shows the open state of the guide vane member 32 by a solid line.

  As shown in FIG. 2, an operating lever 70 is engaged with the two-surface width portion 61 of each shaft portion 56 (see FIG. 7) of each guide vane member 32. The operation lever 70 is formed with an engagement groove 71 having a U-shaped groove shape. The engagement groove 71 is directed rearward (leftward in FIG. 4 and rightward in FIG. 5). In addition, return springs 73 each including a coil spring are interposed between each operation lever 70 and the body main body 30. The return spring 73 is disposed on the bearing boss portion 45 so as to be fitted onto the bearing boss portion 45, and always urges the operating lever 70 in the opening direction. In FIG. 3, the operating lever 70 located on the right side is a drive lever that is driven by an actuator 36 described later, and thus the return spring 73 related to the operating lever 70 is omitted.

  As shown in FIG. 6, a resin drive ring 75 is concentrically fitted to the rear flange portion 42 of the front row of the body 30. Further, a resin retaining ring 77 is fitted to the rear flange portion 42 of the last row of the body 30 and is fixed by fixing means such as heat welding or adhesion. The drive ring 75 is rotatable while being positioned in the axial direction (front-rear direction) by the guide surface 51 including the rear end surface of the right mounting portion 48 of the body main body 30 and the front end surface of the retaining ring 77. Yes. In addition, a large number of protrusions 75a extending in the axial direction protrude from the inner peripheral surface of the drive ring 75 with a predetermined interval (see FIG. 9). The ridge 75a is in line contact with the outer peripheral surface of the rear flange portion 42 of the front row, and slides on the outer peripheral surface of the flange portion 42 as the drive ring 75 rotates. In addition, a total of four round bar-like engagement protrusions 79 project at equal intervals (ie, 90 ° intervals) on the outer peripheral surface of the drive ring 75. Each engaging projection 79 is engaged with an engaging groove 71 of each operating lever 70. Therefore, each actuating lever 70 is rotated synchronously in the same direction by forward and reverse rotation of the drive ring 75. That is, when the drive ring 75 is rotated in the clockwise direction when the guide vane member 32 is closed, each operating lever 70 is rotated in the opening direction (the arrow Y1 direction in FIGS. 4 and 5). The guide vane member 32 is opened by being moved. Further, when the drive ring 75 is rotated in the clockwise direction at the open position of the guide vane member 32, each operating lever 70 is rotated in the closing direction (the direction of arrow Y2 in FIGS. 4 and 5). As a result, the guide vane member 32 is closed. The operating mechanism 70, the return spring 73, and the drive ring 75 constitute the interlocking mechanism 34.

  As shown in FIG. 2, the right operating lever 70 is driven or rotated by a diaphragm type actuator 36. The actuator 36 uses the lower cover portion 54 of the body body 30 as a part of the housing. That is, a housing 82 is constituted by the lower cover portion 54 and the upper cover 81 coupled on the lower cover portion 54. As shown in FIG. 5, the upper cover 81 is formed in a celestial cylindrical shape. The lower cover portion 54 and the upper cover 81 are coupled to each other by a fixing means such as welding or adhesion in a state of being fitted to each other. An opening hole 54 a is formed in the bottom wall portion of the lower cover portion 54. Between the lower cover portion 54 and the upper cover 81, an outer peripheral portion of a diaphragm 84 made of a rubber-like elastic material is airtightly sandwiched. Further, the inside of the housing 82 is divided into a lower atmospheric pressure chamber 85 and an upper negative pressure chamber 86 by the diaphragm 84. The upper cover 81 is formed with a negative pressure introduction port 88 that communicates the inside and outside of the negative pressure chamber 86.

  A lower shell 90 and an upper shell 91 sandwiching the central portion are coupled to the central portion of the first diaphragm 84 in a polymerized manner and concentrically. A base end portion (upper end portion) of a drive shaft 93 that is loosely inserted into the opening hole 54a of the lower cover portion 54 is concentrically coupled to both shells 90 and 91. A coil spring 95 is interposed between the opposing surfaces of the upper cover 81 and the upper shell 91. The coil spring 95 always urges the diaphragm 84 and the drive shaft 93 downward. A front end portion (lower end portion) of the drive shaft 93 is rotatably connected to a front end portion of the right operating lever 70 via a connecting pin 96. Further, the connecting pin 96 is rotatably supported by the operating lever 70 via a bearing 66 (see FIG. 6). The diaphragm actuator 36 corresponds to a “pressure actuator” in this specification.

  A mounting portion 48 of the body 30 of the inlet guide vane 14 is formed between a main body portion of the compressor 16 in the turbocharger 12, a so-called casing (not shown), and a piping member (not shown) communicated upstream thereof. The bolts are fastened to each other with bolts or the like interposed therebetween. A piping member (not shown) is connected to the negative pressure introduction port 88 of the actuator 36 so that the intake negative pressure of the engine 19 acts.

Next, the operation of the inlet guide vane 14 will be described.
Except during supercharging by the turbocharger 12 (see FIG. 1) (when idling or the like), the negative pressure generated in the intake passage 20 of the engine 19 acts in the negative pressure chamber 86 of the actuator 36. The drive shaft 93 of the actuator 36 is raised (see the solid line 93 in FIG. 5). In this state, all of the guide vane members 32 are rotated to the closed position by rotating the right operating lever 70 and the remaining operating lever 70 to the closed position side via the drive ring 75 ( 2 to 7). Therefore, when the amount of air flowing into the compressor 16 is small, the amount of turning given to the air flow can be increased. As a result, supercharging efficiency can be improved.

  Further, when the turbocharger 12 is supercharged (eg, when the accelerator is depressed), the inside of the intake passage 20 of the engine 19 gradually becomes positive pressure. Accordingly, the drive shaft 93 of the actuator 36 is gradually lowered by the coil spring 95 (see the two-dot chain line 93 in FIG. 5). Accordingly, the right operation lever 70 is rotated to the open position side, and the remaining operation levers 70 are rotated to the open position side via the drive ring 75, so that all the guide vane members 32 are opened. It is rotated to a position (see FIG. 8). Therefore, when the amount of air flowing into the compressor 16 is large, the amount of turning given to the air flow can be made zero or small.

  According to the inlet guide vane 14 described above, the vane portion 59 of the guide vane member 32 is offset with an offset amount f1 in the radial direction of the axis 56L of the shaft portion 56 (see FIGS. 11 and 12). Therefore, when the guide vane member 32 is assembled to the passage wall portion 38, the vane portion 59 is directed in a direction along the axial direction of the air passage 39 and the opposing vane portions 59 are combined in a notch shape. Interference between the parts 59 can be avoided (see the two-dot chain line 59 in FIG. 8). At the same time, the length in the axial direction of the vane portion 59 can be set long, and a space portion (a space portion between the vane portions 59 facing each other) serving as an air escape path can be narrowed. For this reason, the assembling property of the guide vane member 32 can be improved while omitting the rectifier (refer to reference numeral 208 in FIG. 13) required in the conventional example.

  Further, in the vane portion 59 of the guide vane member 32, an upstream half portion 63 directed to the upstream side of the air passage 39 and a downstream half portion 64 directed to the downstream side thereof are formed in an asymmetric shape (FIG. 10). reference). Therefore, the aerodynamic center with respect to the upstream half part 63 and the downstream half part 64 of the vane part 59 can be shifted to the downstream side. For this reason, resonance such as flutter of the vane portion 59 can be prevented. Furthermore, abnormal noise due to vibration, wear, and fluctuations in the amount of air can be prevented, and performance can be improved.

  Further, when the guide vane member 32 is closed, a closed position is set at a near side position where the vane portion 59 is located on a plane orthogonal to the axis 39L of the air passage 39 (see FIG. 6). Therefore, at the closed position of the guide vane member 32, a predetermined air flow rate can be obtained while making the air flow into a swirl flow. This is because the oil from the bearing portion of the shaft 25 due to the damage of the turbine wheel 24 of the turbocharger 12 (see FIG. 1) during deceleration of the automobile and the negative pressure generated between the compressor 16 and the inlet guide vane 14. This is effective in preventing leakage.

  Further, the guide vane member 32 is configured to be opened and closed by a diaphragm actuator 36 (see FIG. 5). Accordingly, the guide vane member 32 can be driven to open and close by using a diaphragm actuator 36 that is generally inexpensive and has good mountability on a vehicle.

  Further, a lower cover portion 54 for opening and closing the guide vane member 32 and a passage wall portion 38 of the air passage 39 are integrally formed of resin (see FIG. 9). Therefore, the number of parts and the number of assembly steps can be reduced. Further, by using a resin material, it is possible to easily reduce the surface roughness of the passage wall surface of the air passage 39 as compared with a metal material, that is, to have a mirror surface. Furthermore, oil sludge, foreign matter, and the like are prevented from adhering to the passage wall surface of the air passage 39, which is effective in preventing malfunction and reducing airflow pressure loss. Further, the reduction of the air flow pressure loss contributes to the improvement of the fuel efficiency of the engine 19. Further, the integration of the lower cover portion 54 and the passage wall portion 38 by resin is effective for reducing the size and weight and reducing the cost.

  Further, the shaft portion 56 and the vane portion 59 of the guide vane member 32 are integrally formed (see FIGS. 10 to 12). For this reason, a screw or the like is not required for mounting the shaft portion 56 and the vane portion 59, which is effective in reducing the number of parts and the number of assembling steps.

  The present invention is not limited to the above-described embodiments, and modifications can be made without departing from the gist of the present invention. For example, the inlet guide vane 14 of the present invention can be applied not only to the turbocharger 12 but also to a supercharger, an electric supercharger, and the like. The inlet guide vane 14 can also be configured using a casing of the compressor 16 of the turbocharger 12. Further, as the actuator, instead of the diaphragm (negative pressure) actuator 36, an electric actuator such as an electric motor or an electromagnetic solenoid can be used in addition to a positive pressure actuator. Further, the actuator can be controlled by an electronic control unit, so-called ECU, according to the operating state of the engine 19.

10 ... Turbocharger 12 ... Turbocharger (supercharger)
14 ... Inlet guide vane 16 ... Compressor 32 ... Guide vane member 36 ... Pressure actuator (actuator)
38 ... Passage wall 39 ... Air passage 54 ... Lower cover (actuator housing)
56 ... Shaft 59 ... Vane 63 ... Upstream half 64 ... Downstream half

Claims (5)

An inlet guide vane for adjusting the air flow flowing to the compressor of the turbocharger,
A plurality of guide vane members having a plate-like vane portion that opens and closes an air passage through which air flows and a shaft portion that is rotatably provided about an axis extending in a radial direction with respect to a passage wall portion of the air passage. ,
The inlet guide vane, wherein the vane portion of the guide vane member is offset in the radial direction of the axis of the shaft portion. The inlet guide vane according to claim 1,
An inlet guide vane characterized in that, in the vane portion of the guide vane member, an upstream half directed toward the upstream side of the air passage and a downstream half directed toward the downstream side thereof are formed in an asymmetric shape. . The inlet guide vane according to claim 1 or 2,
An inlet guide vane characterized in that when the guide vane member is closed, a closed position is set at a near side position where the vane portion is located on a plane perpendicular to the axis of the air passage. The inlet guide vane according to any one of claims 1 to 3,
An inlet guide vane characterized in that the guide vane member is driven to open and close by a pressure actuator. The inlet guide vane according to any one of claims 1 to 3,
An inlet guide vane characterized in that a housing portion of an actuator for opening and closing the guide vane member and a passage wall portion of the air passage are integrally formed of resin.

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