JP2001193695A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor which can accomplish a high performance, by reducing the pressure loss and the like resulting from a clearance between an inlet guide blade and the other parts in the inlet flow passage of the compressor. SOLUTION: While a spherical surface 14a is formed at a part of a spherical surface having the center at the point O on the extension line of the rotation shaft center line of an impeller 2, on the inner peripheral surface of a casing 14 at the part opposing to the end face at the casing 14 side of an inlet guide blade 1, the end face at the casing 14 side of the inlet guide blade 1 opposing to the spherical surface 14a is made to make the clearance between both members, by the spherical surface 14a of the casing 14, and a circular arc part at the casing side end face of an inlet guide blade 1 constantly, not depending on the rotation angle of the inlet guide blade 1, by making it in the circular arc form concentric to the spherical surface part 14a.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor, and more particularly, to a compressor.
It is useful when applied to the inlet channel of a centrifugal compressor.
You. FIG. 13 shows the input of a centrifugal compressor according to the prior art.
FIG. 14 is a longitudinal sectional view showing the mouth flow path together with the inlet guide vane 1.
FIG. 3 is a cross-sectional view (a cross-sectional view along the line AA) showing the fully closed state.
You. As shown in both figures, a wide range of pressure ratio and flow rate
This type of centrifugal compressor requires operation at
As a measure to increase the range, upstream of the impeller 2 of the compressor
Is provided with an inlet guide vane 1 so that the flow flowing into the impeller 2
Giving a turn. The inlet guide vane 1 has an inlet guide vane rotation axis 3
Is rotatably supported by the casing 4 through the
Swirl flow by changing the angle of the inlet guide vane 1
Is configured to change the angle. Also, start the compressor
During operation, the chord length direction of the inlet guide vane 1 is almost the same as the flow direction.
Rotate the inlet guide vane 1 so that it becomes a right angle, and centrifugal pressure
The contractor inlet flow path is set to a fully closed state as shown in FIG.
You. This reduces the suction pressure and allows the compressor to start
This is to reduce the driving force of the motor. At this time, the entrance guide wing
1 corresponds to the fully closed state shown in FIG.
So that the gap between the casing and the casing 4 is as small as possible.
Next, the shape of the end face of the entrance guide wing 1 on the casing 4 side is determined.
ing. That is, as shown in FIG.
The shape of the end face of the casing 4 on the side of the casing 4 is
In addition to the arc shape concentric with
Are being worked on. In a centrifugal compressor equipped with an inlet guide vane 1
Is used to make the flow into the impeller 2 more uniform.
The one provided with a mandrel 5 extending in the flow direction at the center of the mouth channel
is there. FIG. 15 shows a prior art centrifugal compression with mandrel 5
Sectional view showing the inlet flow path of the machine together with the inlet guide vanes 1
16 is a cross-sectional view showing the fully closed state (a cross-sectional view taken along line BB).
It is. As shown in both figures, the mandrel 5 is a cylindrical member,
To the casing 4 via the stradding 6
Installed. That is, the base end of the stradd 6
Is fixed to the inner peripheral surface of the casing 4, and
The outer peripheral surface of the mandrel 5 is fixed. Also shown in FIG.
As in the prior art, the inlet guide vane 1 is
Is rotatably supported by the casing 4 through the
Swirl flow by changing the angle of the inlet guide vane 1
When the compressor is started, the angle of FIG.
As shown in the figure, the device is configured to be in a fully closed state. This
When the inlet guide wing 1 is in the fully open state shown in FIG.
In addition, the gap between guide vane 1 and mandrel 5 is as small as possible.
So that the shape of the end face of the inlet guide vane 1 on the shaft 5 side
I have decided. That is, as shown in FIG.
Sometimes the end face shape of the inlet guide wing 1 on the side of the mandrel 5 is outside the mandrel 5.
It is processed into a linear shape that extends along the peripheral surface in the axial direction.
I have. [0004] As described above, FIG. 13 and FIG.
And the centrifugal compressor shown in FIG.
The gap between the inlet guide vane 1 and the casing 4
Of the inlet guide vane 1 on the casing 4 side so that
And the casing of the inlet guide vane 1
The end face shape on the 4 side is a circular arc concentric with the inner circumference of the casing 4
Is processed into a continuous linear shape close to a circle or an arc
At the time of steady operation of the centrifugal compressor after starting, FIG.
As shown in FIG.
The gap between the ring and the ring 4 increases, causing pressure loss and flow.
This causes a problem that the turning angle is reduced. That is,
Clearance during steady operation between inlet guide vane 1 and casing 4
Is a problem. On the other hand, a centrifugal compressor shown in FIGS.
Then, at the time of the fully open state, the inlet guide wing 1 and the mandrel
Entrance guide so that the gap between them is as small as possible
The shape of the end surface of the blade 1 on the side of the pole 5 is determined, and
The shape of the end surface of the mandrel 5 on the side of
Since it is processed into a linear shape along the
The guide vane 1 is rotated to give a swirl to the inflow to the impeller 2.
Between the mandrel 5 of the inlet guide vane 1 and the mandrel 5
The gap increases, causing pressure loss and swirling of the flow
This causes a problem of a decrease in angle. That is, in FIG.
As shown, when the entrance guide vane 1 is fully closed,
The gap between the mouth guide wing 1 and the mandrel 5 becomes a problem. The present invention has been made in view of the above-mentioned conventional technology, and
In the gap between the inlet guide vane and other parts in the inlet channel
Pressure that can reduce the resulting pressure loss and achieve higher performance
The purpose is to provide a contractor. [0007] The present invention achieves the above object.
The configuration of the invention is characterized by the following points. 1) Rotatably supported by a casing,
Arranged in the inlet flow path upstream of the impeller to adjust its opening
To give a swirl to the flow flowing into the impeller in advance.
In a compressor having a plurality of inlet guide vanes,
End face on the casing side of the inlet guide vane
Form a spherical part that is a part of the spherical surface in the part facing the
In addition, the casing-side end surface of the inlet guide wing is the spherical surface
It should be an arc shape concentric with the part. According to the invention, the inlet
Regardless of the rotation angle of the guide wing, the spherical part of the casing and the entrance
Always keep the gap between the guide vanes at the arc on the casing side end face.
Can be constant. 2) It is rotatably supported by the casing,
Arranged in the inlet flow path upstream of the impeller to adjust its opening
To give a swirl to the flow flowing into the impeller in advance.
In a compressor having a plurality of inlet guide vanes,
The end face of the inner wing on the casing side is aligned with the rotation axis center line of the impeller.
It is formed into a parallel straight line and the inner peripheral surface of the casing.
Has a flat shape parallel to the casing-side end face of the entrance guide wing.
Concave section, whose cross-sectional shape is
A polygonal recess with the side surface on the side of the lancing side as one side was formed.
thing. According to the present invention, depending on the rotation angle of the entrance guide vane,
Of the casing and the casing-side end surface of the inlet guide vane
Can keep the gap between the two constant
You. [0010] 3) is rotatably supported by the casing,
Arranged in the inlet flow path upstream of the impeller to adjust its opening
To give a swirl to the flow flowing into the impeller in advance.
Having a plurality of inlet guide vanes,
A channel located at the center of the inlet channel to make the inlet uniform
In a compressor having a cylindrical mandrel extending in one direction,
Opposed to the end surface of the rod guide wing on the mandrel side of the outer peripheral surface of the rod
To form a spherical part which is a part of the spherical surface
The end face of the inlet guide wing facing the mandrel facing the spherical surface
Is an arc shape concentric with the spherical surface of the mandrel. The present invention
According to, regardless of the rotation angle of the entrance guide wing, the spherical surface of the mandrel
Gap between the shaft and the arc on the end face of the inlet guide vane
Can always be constant. 4) The casing is rotatably supported by the casing,
Arranged in the inlet flow path upstream of the impeller to adjust its opening
To give a swirl to the flow flowing into the impeller in advance.
Having a plurality of inlet guide vanes,
A channel located at the center of the inlet channel to make the inlet uniform
In a compressor having a cylindrical mandrel extending in the
The end face on the stem side of the mouth guide wing is parallel to the center axis of the rotation axis of the impeller.
And the outer surface of the mandrel,
The part facing the mandrel side end face of the mouth guide wing has an entrance plan
A flat recess parallel to the end face of the inner wing on the mandrel side,
The cross-sectional shape is one end of the end face on the mandrel side of the inlet guide wing.
That a polygonal concave portion is formed. According to the invention, the inlet
Regardless of the rotation angle of the guide wing, it is a concave part and a straight part of the mandrel
Always keep the gap between the inlet guide vane and the end face on the pole side constant
can do. 5) supported rotatably by the casing,
Arranged in the inlet flow path upstream of the impeller to adjust its opening
To give a swirl to the flow flowing into the impeller in advance.
Having a plurality of inlet guide vanes,
A channel located at the center of the inlet channel to make the inlet uniform
In a compressor having a cylindrical mandrel extending in the
The inlet guide wing is fixed to the upstream fixed wing and the downstream
Into a wrap and a fixed wing with a strap supporting the mandrel.
Function as well as the flaps rotate
It is rotatably supported on the casing via a shaft. Departure
According to Ming, abolished the stradd to support the mandrel
Can be replaced with fixed wings and
By abolishing the road, the upstream will be rectified. By the way, one
In general, the wake of the straddle wake is the blade vibration of the downstream impeller.
In some cases, it becomes an excitation source. Also, the flap chord length
By shortening, the flap when the flap is rotated
The gap between the mandrel and the mandrel can be reduced. 6) It is rotatably supported by the casing,
Arranged in the inlet flow path upstream of the impeller to adjust its opening
To give a swirl to the flow flowing into the impeller in advance.
Having a plurality of inlet guide vanes,
A channel located at the center of the inlet channel to make the inlet uniform
In a compressor having a cylindrical mandrel extending in the
Of the inner guide surface on the casing side of the inlet guide vane
Form a spherical part that is a part of the spherical surface on the part facing the end face
And the casing end face of the entrance guide wing
The arc is concentric with the surface, and the outer surface of the mandrel,
A spherical surface is located on the part of the inlet guide
Form a spherical part that is a part and face this spherical part
The end face on the mandrel side of the inlet guide wing is concentric with the spherical part of the mandrel
Arc shape. According to the present invention, the inlet guide wing
Regardless of the rotation angle, the spherical part of the mandrel and the mandrel side of the entrance guide wing
Not only the gap between the arc and the end face but also the casing
And the arc on the casing-side end face of the inlet guide vane.
And the gap between the two can always be constant. 7) The casing is rotatably supported by the casing,
Arranged in the inlet flow path upstream of the impeller to adjust its opening
To give a swirl to the flow flowing into the impeller in advance.
Having a plurality of inlet guide vanes,
A channel located at the center of the inlet channel to make the inlet uniform
In a compressor having a cylindrical mandrel extending in the
The casing-side end face of the mouth guide wing is located at the center of the rotation axis of the impeller.
It is formed in a straight line parallel to the line and inside the casing.
A flat surface parallel to the casing-side end face of the inlet guide vane
A recess having a planar shape, the cross-sectional shape of which is
Form a polygonal recess with one end facing the casing side
The end face of the inlet guide vane on the mandrel side is the rotating shaft of the impeller.
Form a straight line parallel to the center line, and
Part of the surface facing the mandrel-side end surface of the inlet guide wing
Has a flat recess parallel to the end face of the inlet guide wing on the mandrel side.
Part, the cross-sectional shape of which is the end of the inlet guide vane on the mandrel side
A polygonal concave part having a surface as one side is formed. In the present invention
According to this, regardless of the rotation angle of the entrance guide vane,
Between the straight guide and the mandrel end face of the inlet guide vane
Not only the gap but also the casing recess and the inlet guide vane case
The gap between the straight end of the bearing and the straight side is always constant.
can do. 8) It is rotatably supported by the casing,
Arranged in the inlet flow path upstream of the impeller to adjust its opening
To give a swirl to the flow flowing into the impeller in advance.
Having a plurality of inlet guide vanes,
A channel located at the center of the inlet channel to make the inlet uniform
In a compressor having a cylindrical mandrel extending in the
The casing-side end face of the mouth guide wing is located at the center of the rotation axis of the impeller.
It is formed in a straight line parallel to the line and inside the casing.
A flat surface parallel to the casing-side end face of the inlet guide vane
A recess having a planar shape, the cross-sectional shape of which is
Form a polygonal recess with one end facing the casing side
And, on the outer peripheral surface of the mandrel, on the mandrel side of the entrance guide wing.
Form a spherical part that is a part of the spherical surface on the part facing the end face
And the center of the inlet guide vane facing this spherical surface
The end face on the rod side should have an arc shape concentric with the spherical part of the mandrel.
When. According to the present invention, regardless of the rotation angle of the entrance guide wing,
Between the spherical part of the mandrel and the arc part of the mandrel side end face of the inlet guide wing.
Not only the gap between the two, but also the casing recess and entrance guide
The gap between the wing and the straight part on the casing side end face
It can always be constant. 9) It is rotatably supported by the casing,
Arranged in the inlet flow path upstream of the impeller to adjust its opening
To give a swirl to the flow flowing into the impeller in advance.
Having a plurality of inlet guide vanes,
A channel located at the center of the inlet channel to make the inlet uniform
In a compressor having a cylindrical mandrel extending in the
Of the inner guide surface on the casing side of the inlet guide vane
Form a spherical part that is a part of the spherical surface on the part facing the end face
And the casing end face of the inlet guide vane
An arc shape concentric with the spherical surface, and the mandrel of the inlet guide vane
Side end surface is formed in a straight line parallel to the center axis of the rotation axis of the impeller
And the mandrel of the entrance guide wing on the outer surface of the mandrel
In the part opposite to the end face of the
A recess with a planar shape parallel to the end face, and its cross-sectional shape
Is a polygonal recess whose side is the end face on the mandrel side of the entrance guide wing
Was formed. According to the present invention, the rotation angle of the entrance guide vane
Regardless of the degree, the center of the inlet guide vane, which is the concave part of the mandrel and the straight part
Not only the gap between the rod end face but also the casing,
Between the spherical surface and the arc on the casing-side end face of the inlet guide vane.
The gap between the two can always be constant. 10) Compression described in 1) or 9) above
Machine, the inner guide surface of the casing
The spherical surface facing the end face on the casing side is the rotation of the impeller.
A part of the sphere centered on a point on the extension of the pivot axis
That. According to the present invention, the spherical portion is a part of one spherical surface.
Can be formed. 11) Compression described in 3) or 8) above
Of the mandrel, on the mandrel side of the entrance guide wing on the outer peripheral surface of the mandrel
Of the rotating shaft of the impeller
Part of a spherical surface centered on a point on the extension line. Departure
According to Ming, the spherical part is formed by a part of one spherical surface
Can be. 12) In the compressor described in 6 above
Of the inner peripheral surface of the casing,
Of the inlet guide vane of the end face on the
The spherical portion facing the rod-side end surface is the center of the rotation axis of the impeller.
Part of a sphere centered on a point on the extension of the line.
According to the present invention, each spherical portion is part of one spherical surface.
Can be formed. Embodiments of the present invention will be described below with reference to the drawings.
It will be described in detail based on FIG. Note that common parts in each drawing
Are denoted by the same reference numerals, and duplicate description will be omitted. FIG. 1 shows a remote controller according to a first embodiment of the present invention.
Longitudinal section showing the inlet flow path of the core compressor with the inlet guide vanes
FIG. 2 is a cross-sectional view showing the fully closed state (a cross-section taken along line CC).
Figure). As shown in both figures, this embodiment is the same as FIG. 13 and FIG.
Improvements of the type without mandrel 5 shown in 14
13 and FIG. 13 except for the shape of the casing 14.
This is exactly the same as the prior art shown in FIG. This form is
Inner circumference of casing 14 at the mounting position of mouth guide wing 1
The shape of the surface is devised. That is,
On the inner peripheral surface of the casing 14, the rotation axis center line of the impeller 2 is provided.
And the extension of the axis center line of the rotating shaft 3 of the inlet guide vane 1
A part of the sphere centered on the point O which is the intersection with the line
14a is formed. On the other hand, the corresponding entrance guide
The end surface of the blade 1 on the casing 14 side is concentric with the spherical portion 14a.
In the shape of an arc. As a result, the entrance guide wing 1
Irrespective of the rotation angle of the spherical surface portion 14a of the casing 14,
The arcuate portion on the casing side end surface of the inlet guide vane 1
The gap can always be constant. Thus, the entrance plan
The clearance between the inner wing 1 and the casing 14 is
Keep it at a small value, and install between the casing 14 and the inlet guide vane 1.
Pressure loss and decrease in turning angle.
It has become. It should be noted that the spherical portion 14 in the above embodiment is used.
a is formed by a part of the spherical surface centered on the point O,
Need not be formed in this manner. The inner peripheral shape is spherical
And the corresponding casing of the inlet guide vane 1
The end surface on the side of the housing 14 is the same as the spherical portion 14a of the casing 14.
With the arc shape of the heart, the same action and effect can be obtained.
Wear. However, the spherical portion 14a is one of the spherical surfaces around the point O.
If it is a part, this sphere is shaped as part of one type of sphere
Making it the easiest and most efficient
Can be done On the other hand, if not
Forms the number of spherical surfaces corresponding to the number of entrance guide vanes 1.
And the manufacturing process is correspondingly complicated. According to the first embodiment, FIG.
(It is the same as FIG. 14).
Even in the steady state, the inlet guide vane 1 and the casing 14
The gap between them can be minimized. FIG. 3 shows a remote controller according to a second embodiment of the present invention.
Longitudinal section showing the inlet flow path of the core compressor with the inlet guide vanes
FIG. 4 is a cross-sectional view showing the fully closed state (a cross section taken along line D-D).
Figure). As shown in both figures, this embodiment is the same as FIG. 13 and FIG.
Improvements of the type without mandrel 5 shown in 14
Then, the shapes of the inlet guide vanes 21 and the casing 24 are devised.
It is a thing. That is, the casing of the inlet guide vane 21
The end face on the 24 side is a straight line parallel to the rotation axis center line of the impeller 2.
It is formed in a shape. On the other hand, the casing 24
Parallel to the end surface of the inlet guide vane 21 on the casing 24 side.
A concave portion 24a having a simple planar shape is provided in an annular shape. here,
The cross-sectional shape (shape shown in FIG. 4) of the concave portion 24a is
The edge of the mouth guide wing 21 on the casing 24 side is one side.
It is formed in a square (octagon in the figure). Thus, the entrance
A part of the guide vane 21 has a casing at the end face on the casing 24 side.
And rotate in such a manner as to fit into the recess 24 a of the
You. Due to this, depending on the rotation angle of the entrance guide vane 21,
The recess 24a of the casing 24 and the
The gap between the two at the straight part of the
Can be fixed. Thus, the entrance guide wing 21 and the
The gap between the housing and
The pressure between the casing 24 and the inlet guide vanes 21
It suppresses the occurrence of force loss and the decrease in turning angle.
ing. According to the second embodiment, FIG.
In any of the fully closed and fully open states shown, the inlet guide vanes
Minimizing the gap between 21 and casing 24
Can be. FIG. 5 shows a remote controller according to a third embodiment of the present invention.
Longitudinal section showing the inlet flow path of the core compressor with the inlet guide vanes
FIG. 6 is a cross-sectional view showing the fully closed state (a cross section taken along line EE).
Figure). As shown in both figures, this embodiment is the same as FIG. 15 and FIG.
It is related to improvement of the type having the mandrel 5 shown in FIG.
Yes, the shapes of the entrance guide wing 31 and the mandrel 35 were devised.
It is. That is, the entrance guide in the outer peripheral surface of the mandrel 35
The part facing the end face of the wing 31 on the pole 35 side is an impeller.
2 and the rotation axis of the inlet guide vane 31
Centering on the point O which is the intersection with the extension of the axis center line 3
A part of the spherical surface is formed as a spherical portion 35a. on the other hand,
The end face of the inlet guide wing 31 facing the shaft 35 on the pole 35 side
Has a circular arc shape concentric with the spherical portion 35a of the mandrel 35.
You. Due to this, depending on the rotation angle of the entrance guide vane 31,
The spherical portion 35a of the shaft 35 and the shaft 3 of the entrance guide vane 31
Always keep the gap between the two and the arc on the end face on the three sides constant
be able to. Thus, the entrance guide wing 31 and the mandrel 35
Between the guide guides 3
Pressure loss between the shaft 1 and the mandrel 35 and the turning angle
The degree of decrease is suppressed. In the above embodiment, the outer periphery of the mandrel 35
The surface shape is a part of the spherical surface centered on the point O,
Although formed, it is not always necessary to form in this way.
The outer peripheral surface is spherical and the corresponding inlet
The end surface of the guide wing 31 on the shaft 35 side is the spherical portion 3 of the shaft 35.
The same operation and effect can be obtained if the arc shape is concentric with 5a.
be able to. However, the spherical portion 35a is centered on the point O
If it is part of a sphere, this sphere is part of a sphere
Can be formed as
It can be performed efficiently. On the contrary, it is not
In the case where the number of
It is necessary to form a spherical surface, and the manufacturing process is
Become. According to the third embodiment, FIG.
In addition to the fully open state shown in FIG.
In the fully closed state, the entrance guide wing 31 and the mandrel 35
The gap between them can be minimized. FIG. 7 shows a remote controller according to a fourth embodiment of the present invention.
Longitudinal section showing the inlet flow path of the core compressor with the inlet guide vanes
FIG. 8 is a cross-sectional view showing the fully closed state (a cross-section taken along line FF).
Figure). As shown in both figures, this embodiment is the same as FIG. 15 and FIG.
It is related to improvement of the type having the mandrel 5 shown in FIG.
The shape of the mandrel 45 is devised. Sand
Of the outer peripheral surface of the mandrel 45, the mandrel 4 of the entrance guide vane 41
At the part opposite to the end face on the 5th side, the center of the entrance guide vane 41
A flat recess 45a parallel to the end face on the rod 45 side is formed in an annular shape.
It is provided. Here, the cross-sectional shape of the recess 45a (FIG.
8) is the end face of the inlet guide vane 41 on the side of the pole 45.
Is formed as a polygon (octagon in the figure).
The end face of the inlet guide vane 41 on the side of the pole 45 is the
It is formed in a straight line parallel to the center of the rotation axis. Thus,
A part of the inlet guide wing 41 is recessed at the end face on the side of the mandrel 45.
It rotates in a form fitted into 45a. This allows
Regardless of the rotation angle of the entrance guide vane 41, the recess 4 of the mandrel 45
5a and the end surface of the inlet guide vane 41, which is a straight portion, on the shaft 45 side
With this, the gap between the two can always be kept constant. Scratch
The gap between the inlet guide vane 41 and the mandrel 45 is structurally
Between the mandrel 45 and the inlet guide vane 41
Of pressure loss and reduction of turning angle
It has become. According to the fourth embodiment, FIG.
In addition to the fully open state shown in FIG.
In the fully closed state, the entrance guide vane 41 and the stem 45
The gap between them can be minimized. FIG. 9 shows a remote controller according to a fifth embodiment of the present invention.
Longitudinal section showing the inlet flow path of the core compressor with the inlet guide vanes
FIG. 10 and FIG. 10 are cross sectional views showing the fully closed state (broken line GG).
FIG. As shown in FIGS.
According to improvement of type having mandrel 5 shown in FIG.
The structure of the entrance guide wing 51 is devised.
That is, in the present embodiment, the inlet guide vanes 51 are
Side fixed wing 51a and downstream chord length short flap 51
b. Here, the fixed wing 51a is a heart
It also functions as a stradd for supporting the rod 5. Also,
The wrap 51b is connected to the casing
4 rotatably supported. According to the fifth embodiment, FIG.
And the struts in the third and fourth embodiments shown in FIG.
It is possible to abolish the pad 6 and replace it with the fixed wing 51a.
Yes, and abolish the stradd 6 to rectify the upstream
And reliability can be improved. By the way,
In general, the wake downstream of the straddle 6
It may be a source of excitation for blade vibration. In addition, the entrance guide wing 5
1, the chord length of the flap 51b is shortened.
To give a swirling flow to the impeller 2
Flap 51b and mandrel 5 when flap 51b is rotated
Can be reduced, and the vicinity of the mandrel 5 can be reduced.
Pressure loss in a minute and a decrease in the swirl angle of the flow
The problem is reduced. In the third and fourth embodiments, the mandrel 3
5 and 45, the mandrel 3 of the inlet guide vane
Minimize the gap between the end face on the side of 5, 45 and the mandrel 35, 45
But with no mandrel
By combining with certain first and second embodiments,
Between the casing side of the inlet guide vane and the casing
Of course, it is also possible to configure to minimize the interval.
You. Such embodiments are referred to as sixth and seventh embodiments.
11 and 12 are shown in FIG. The sixth embodiment shown in FIG.
Embodiment 1 is a combination of Embodiment 1 and Embodiment 1.
You. That is, the inner peripheral surface of the casing 14
4a, which is opposed to the inlet guide vane 31
The end surface on the casing 14 side is an arc concentric with the spherical portion 14a.
As a shape. Therefore, according to the present embodiment, the entrance plan
The gap between the end face of the inner wing 31 on the mandrel 35 side and the mandrel 35
In addition, the end face of the entrance guide wing 31 on the casing 14 side and
The gap between the casing and the casing can be minimized.
You. Thus, regardless of the rotation angle of the entrance guide vane 31,
Between the spherical portion 35a of the rod 35 and the end face of the inlet guide vane 31 on the mandrel side.
Not only the gap between the two and the arc, but also the casing 14
Of the spherical surface portion 14a of the casing and the end surface of the inlet guide vane 31 on the casing side.
The gap between the two at the arc can be kept constant
You. Thus, between the inlet guide vane 31 and the casing 14
And the gap between the inlet guide vane 31 and the mandrel 35
Keep the casing 14 and inlet guide vanes to the minimum permissible
31 and between the inlet guide vane 31 and the mandrel 35
Pressure loss and lowering of the turning angle more effectively.
Can be controlled. The seventh embodiment shown in FIG.
Embodiment 2 is a combination of Embodiment 2 and Embodiment 2.
You. That is, the end of the entrance guide blade 21 on the casing 24 side.
The surface is formed in a straight line parallel to the rotation axis center line of the impeller 2.
The casing 24 has an inlet guide vane on its inner peripheral surface.
21 is a recess having a planar shape parallel to the end face on the casing 24 side.
24a is provided annularly. Here, the recess 24a
The cross-sectional shape (shape shown in FIG. 4) is
The polygon having an end surface on the side of the sewing 24 as one side (8 in FIG. 4)
(Square). Thus, the entrance in the present embodiment
A part of the guide wing 21 has an end face on the casing 24 side.
Is fitted in the recess 24a, and the end on the mandrel 45 side
On the surface, it rotates in a form fitted in the concave portion 45a. this child
Thus, regardless of the rotation angle of the entrance guide vane 21, the shaft 4
5 and the mandrel 4 of the inlet guide vane 21 which is a straight part.
Not only the gap between them at the end face on the 5th side but also the casing
24 concave portion 24a and casing 24 side of inlet guide vane 21
Always keep the gap between the straight section of the end face
be able to. Thus, the entrance guide wing 21 and the mandrel 45
Between the inlet guide vanes 21 and the casing 2
4 is also kept to the minimum permissible structural value,
And between the inlet guide vane 21 and the inlet guide vane 21
Occurrence of pressure loss with the rod 45 or low turning angle
The lower part can be suppressed more effectively. Although not shown, the third embodiment
The second embodiment can be combined with the embodiment. This
This will be described as an eighth embodiment. This eighth implementation
In the embodiment, the casing is the same as that of the second embodiment.
Casing 24 and the inlet guide wings
3 is similar to the entrance guide wing 21 shown in FIG.
The end face on the side of the mandrel 35 is the same as the entrance guide wing 31 shown in FIG.
Formed in the same manner. Thus, the inlet guide wing in the present embodiment
Is partially recessed at the end face on the casing 24 side.
a, and the end face on the mandrel 35 side is spherical
It pivots via a slight gap between itself and the portion 35a. this child
Thus, the same operation as in the sixth and seventh embodiments is performed.
・ Get the effect. Similarly, the fourth embodiment is replaced with the first embodiment.
Forms can also be combined. This is the ninth implementation
This will be described as an embodiment. In the ninth embodiment,
Is a casing similar to that of the first embodiment.
14, and the inlet guide vane is an end face on the casing 14 side.
Is similar to the inlet guide vane 1 shown in FIG.
The end face is formed in the same manner as the entrance guide vane 41 shown in FIG. Or
Thus, the inlet guide wing in the present embodiment is
On the side end face through a slight gap between
In the end face on the side of the mandrel 45, a part thereof is
It rotates in the form fitted in the part 45a. By this
Therefore, the same operation and effect as those of the sixth and seventh embodiments are obtained.
Get. The above has been described in detail together with the embodiments.
As described above, according to the present invention, the following effects are obtained. The invention described in [Claim 1] is a casein
Rotatably supported in the inlet flow path on the upstream side of the impeller.
Flow into the impeller by adjusting the opening
Has multiple inlet guide vanes that give swirl to the flowing flow in advance
Of the inner peripheral surface of the casing
The surface of the inner wing facing the casing side end face
Of the entrance guide vane
The end surface on the sing side has an arc shape concentric with the spherical surface.
Therefore, regardless of the rotation angle of the entrance guide vane, the spherical surface of the casing
At the casing side end of the inlet guide vane
The gap can always be constant. As a result, the entrance plan
Keep the clearance between the inner wing and the casing to the minimum permissible structural value
Pressure loss between the casing and the inlet guide vanes
And a decrease in the turning angle can be suppressed. Or
Thus, the effect that the compressor can be made more efficient can be achieved.
Play. The invention described in [claim 2] is a casing
Rotatably supported in the inlet flow path on the upstream side of the impeller.
Flow into the impeller by adjusting the opening
Has multiple inlet guide vanes that give swirl to the flowing flow in advance
End face on the casing side of the inlet guide vane
Is formed in a straight line parallel to the center line of the rotation axis of the impeller.
In both cases, the casing of the entrance guide wing is
A flat recess parallel to the end face of the
The cross-sectional shape is such that the casing-side end face of the inlet guide vane is
Of the inlet guide vane
Regardless of the degree, the recess of the casing and the casing of the inlet guide wing
Always keep the gap between the two straight at the straight part
Can be. As a result, the space between the inlet guide vanes and the casing
Keep the clearance to the minimum permissible value for the structure and the casing and inlet
Occurrence of pressure loss between inner wing and reduction of swivel angle
Can be suppressed. Thus, as described in [Claim 1]
The same effects as those of the invention described above are obtained. The invention described in claim 3 is a casing
Rotatably supported in the inlet flow path on the upstream side of the impeller.
Flow into the impeller by adjusting the opening
Has multiple inlet guide vanes that give swirl to the flowing flow in advance
As well as in the inlet channel to make the inflow to the impeller uniform.
A cylindrical mandrel arranged at the center of
Of the outer surface of the mandrel,
A part of the spherical surface opposite to the end face on the mandrel side of the wing
An inlet that forms a spherical surface and faces this spherical surface
The end face on the mandrel side of the guide wing is an arc shaped concentric with the spherical part of the mandrel
Shape of the mandrel, regardless of the rotation angle of the entrance guide wing.
The arc between the spherical surface and the end face of the inlet guide vane on the mandrel side
The gap can always be constant. As a result, entrance guidance
Keep the clearance between the wing and the mandrel to the minimum permissible
Of pressure loss between the sinking and the inlet guide vane
Also, it is possible to suppress a decrease in the turning angle. Hide
Thus, an effect similar to that of the invention described in [Claim 1] is obtained.
You. According to a fourth aspect of the present invention,
Rotatably supported in the inlet flow path on the upstream side of the impeller.
Flow into the impeller by adjusting the opening
Has multiple inlet guide vanes that give swirl to the flowing flow in advance
As well as in the inlet channel to make the inflow to the impeller uniform.
A cylindrical mandrel arranged at the center of
The end face of the inlet guide vane on the mandrel side is a blade.
It is formed in a straight line parallel to the rotation shaft center line of the wheel
Of the outer peripheral surface of the mandrel,
The opposing parts are parallel to the end face of the inlet guide wing on the mandrel side.
Concave section with a flat cross section, the cross-sectional shape of which is
Formed a polygonal recess with one side being the end face on the mandrel side of the wing
Therefore, regardless of the rotation angle of the entrance guide vane,
Always keep the gap between the inlet guide vane and the mandrel end
Can be constant. As a result, the entrance guide wing and
The gap between the casing and the
Of pressure loss between the sinking and the inlet guide vane
Also, it is possible to suppress a decrease in the turning angle. Hide
Thus, an effect similar to that of the invention described in [Claim 1] is obtained.
You. The invention as set forth in claim 5 is the case
Rotatably supported in the inlet flow path on the upstream side of the impeller.
Flow into the impeller by adjusting the opening
Has multiple inlet guide vanes that give swirl to the flowing flow in advance
As well as in the inlet channel to make the inflow to the impeller uniform.
A cylindrical mandrel arranged at the center of
The inlet guide vanes, the upstream fixed vanes
And a flap with a shorter chord length on the downstream side and a fixed wing
Has a function as a stradd to support the mandrel.
And the flap is rotated to the casing via the rotating shaft.
Movably supported, the strap for supporting the mandrel
Can be abolished and replaced with fixed wings.
By eliminating the straddle, the upstream will be rectified. Chi
By the way, in general, the wake downstream of the straddle is
It may be a source of excitation for vehicle wing vibration. Also flap
When the flap is turned by reducing the chord length of
The gap between the flap and the mandrel can be reduced
You. As a result, flow pressure loss occurs and the swirl angle decreases.
Not only can lower the bottom
Simplification and cost reduction in this regard
can do. The invention as set forth in claim 6 is the case
Rotatably supported in the inlet flow path on the upstream side of the impeller.
Flow into the impeller by adjusting the opening
Has multiple inlet guide vanes that give swirl to the flowing flow in advance
As well as in the inlet channel to make the inflow to the impeller uniform.
A cylindrical mandrel arranged at the center of
Of the inner peripheral surface of the casing,
Spherical surface facing the end face of the mouth guide wing on the casing side
Of the entrance guide wing
The end face on the casing side has an arc shape concentric with the spherical part.
And the end on the mandrel side of the entrance guide wing in the outer peripheral surface of the mandrel
Form a spherical part that is a part of the spherical surface on the part facing the surface
And the mandrel side of the entrance guide wing facing this spherical surface
The end face of was made an arc shape concentric with the spherical part of the mandrel,
Regardless of the rotation angle of the entrance guide wing, the spherical part of the mandrel and the entrance plan
If only the gap between the two at the arc of the mandrel end face on the inner wing
The spherical part of the casing and the casing side end of the inlet guide vane
The gap between the two at the arc of the surface can be kept constant.
Wear. As a result, the gap between the inlet guide wing and the mandrel
The gap between the inlet guide vane and the casing is structurally
The guide vanes, casing and mandrel
Pressure loss and decrease in turning angle
Can be controlled. As a result, [claim 1] to [contract
Claim 4) The casing is even better than the invention described in claim 4).
Pressure loss between the pump and the inlet guide vane,
The decrease in the degree can be suppressed. Thus, the compression
More efficient operation of the machine can be realized. The invention as set forth in claim 7 is the case
Rotatably supported in the inlet flow path on the upstream side of the impeller.
Flow into the impeller by adjusting the opening
Has multiple inlet guide vanes that give swirl to the flowing flow in advance
As well as in the inlet channel to make the inflow to the impeller uniform.
A cylindrical mandrel arranged at the center of
End of the inlet guide vane on the casing side
The surface is formed in a straight line parallel to the axis of rotation of the impeller
At the same time, on the inner peripheral surface of the casing,
A flat recess parallel to the end surface on the shing side,
The cross-sectional shape is one side of the casing-side end face of the inlet guide vane.
To form a polygonal concave part, and furthermore, a mandrel of the entrance guide wing
Side end surface is formed in a straight line parallel to the center axis of the rotation axis of the impeller
And the mandrel of the entrance guide wing on the outer surface of the mandrel
In the part opposite to the end face of the
A recess with a planar shape parallel to the end face, and its cross-sectional shape
Is a polygonal recess whose side is the end face on the mandrel side of the entrance guide wing
So that the mandrel does not depend on the rotation angle of the entrance guide wing.
Of the inlet guide vane on the mandrel side end face
Not only the gap between
Always keep the gap between the two at the straight part on the casing side end face
Can be fixed. As a result, the entrance guide wing and mandrel
Between the inlet guide vanes and the casing as well as the gap between
Keep the clearance between the casing and the casing
Pressure loss between the wing guide wing and the turning angle
The decrease can be suppressed. As a result, [Claim 1]
To better than the invention described in [Claim 4].
Of pressure loss between the sinking and the inlet guide vane
And a decrease in the turning angle can be suppressed.
As in the invention described in [6], a higher efficiency of the compressor can be achieved.
Driving. The invention as set forth in claim 8 is the case
Rotatably supported in the inlet flow path on the upstream side of the impeller.
Flow into the impeller by adjusting the opening
Has multiple inlet guide vanes that give swirl to the flowing flow in advance
As well as in the inlet channel to make the inflow to the impeller uniform.
A cylindrical mandrel arranged at the center of
End of the inlet guide vane on the casing side
The surface is formed in a straight line parallel to the axis of rotation of the impeller
At the same time, on the inner peripheral surface of the casing,
A flat recess parallel to the end surface on the shing side,
The cross-sectional shape is one side of the casing-side end face of the inlet guide vane.
To form a polygonal concave portion, and
In addition, a spherical surface is formed at the part of the inlet guide
And a spherical part that is a part of
The mandrel-side end faces of the opposing inlet guide vanes are the spherical part of the mandrel
Arc shape concentric with the
Regardless of the spherical shape of the mandrel and the arc on the mandrel side end face of the inlet guide vane
Not only the gap between the two parts, but also
Between the inlet guide vane and the straight part of the casing side end face
The gap can also be kept constant. Entrance guide wing and heart
Not only the gap between the rods, but also the entrance guide wing and the casing
Keep the gap between
Pressure loss between the pump and the inlet guide vane,
The decrease in the degree can be suppressed. As a result, [Claim
1) to better than the inventions described in [Claim 4]
Pressure loss between the casing and the inlet guide vane
And a reduction in the turning angle can be suppressed.
As in the invention described in [6], a higher efficiency of the compressor can be achieved.
Driving. [0047] The invention described in claim 9 is the case
Rotatably supported in the inlet flow path on the upstream side of the impeller.
Flow into the impeller by adjusting the opening
Has multiple inlet guide vanes that give swirl to the flowing flow in advance
As well as in the inlet channel to make the inflow to the impeller uniform.
A cylindrical mandrel arranged at the center of
Of the inner peripheral surface of the casing,
Spherical surface facing the end face of the mouth guide wing on the casing side
Of the entrance guide wing
The end face on the casing side has an arc shape concentric with the spherical part.
The end face of the inlet guide vane on the mandrel side is the rotating shaft of the impeller.
Form a straight line parallel to the center line, and
Part of the surface facing the mandrel-side end surface of the inlet guide wing
Has a flat recess parallel to the end face of the inlet guide wing on the mandrel side.
Part, the cross-sectional shape of which is the end of the inlet guide vane on the mandrel side
Since a polygonal concave part with one side is formed, entrance guidance
Entrance that is a concave part and a straight part of the mandrel regardless of the rotation angle of the wing
If only the gap between the guide wing and the mandrel end face is
The spherical part of the casing and the casing side end of the inlet guide vane
Always keep the gap between the arc and the surface constant
it can. As a result, only the gap between the inlet guide vane and the mandrel
Also, the gap between the entrance guide wing and the casing is also structured
Between the casing and the inlet guide vanes, keeping the above permissible minimum
Of pressure loss and reduction of turning angle
be able to. As a result, [Claim 1] to [Claim 1
4) The casing can be inserted even better than the invention described in 4).
Pressure loss between the wing guide wing and the turning angle
It is possible to suppress the decrease,
As mentioned above, it can contribute to more efficient operation of the compressor.
You. The invention described in [Claim 10] is based on [Claim 10
In the compressor according to the first aspect or the ninth aspect,
Of the inner guide surface on the casing side of the inlet guide vane
The spherical part facing the end face is the extension of the center axis of the rotation axis of the impeller.
Since it is a part of the sphere centered on a point on the long line, the sphere
The surface part becomes a part of one spherical surface. As a result, [Claim
In addition to the effects of the invention described in [1] or [Claim 9],
The most efficient work to form a spherical surface on the inner peripheral surface
Can contribute to the reduction of product costs.
You. The invention described in [Claim 11]
The compressor according to claim 3 or claim 8, wherein
Opposed to the end face on the pole side of the inlet guide wing on the outer peripheral surface of the rod
The spherical part is a point on the extension of the axis of rotation of the impeller.
Since it is a part of the center spherical surface, the spherical portion
Becomes part of a spherical surface. As a result, [claim 3] or [claim
Item 8], in addition to the effects of the invention described in
The work of forming the surface can be performed most efficiently.
This can contribute to a reduction in product cost. The invention described in [Claim 12]
Item 6], the inner peripheral surface of the casing.
Among them, the casing-side end face of the entrance guide wing and the mandrel
Of the outer peripheral surface, it faces the end surface of the inlet guide wing on the pole side.
The spherical part is centered on a point on the extension of the axis of rotation of the impeller.
Are both part of the spherical surface.
Part of the spherical surface. As a result, as described in [Claim 6]
In addition to the effects of the present invention, a spherical portion is formed on the inner peripheral surface of the casing.
Work and work to form a spherical surface on the outer peripheral surface of the mandrel
Can be performed most efficiently, resulting in lower product costs.
It can contribute to reduction.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing an inlet flow path of a centrifugal compressor according to a first embodiment of the present invention together with an inlet guide blade. FIG. 2 is a transverse sectional view (CC sectional view) showing the fully closed state of FIG. FIG. 3 is a longitudinal sectional view showing an inlet passage of a centrifugal compressor according to a second embodiment of the present invention, together with inlet guide vanes. FIG. 4 is a transverse sectional view (DD sectional view) showing the fully closed state of FIG. 3; FIG. 5 is a longitudinal sectional view showing an inlet passage of a centrifugal compressor according to a third embodiment of the present invention, together with inlet guide vanes. 6 is a transverse sectional view (EE sectional view) showing the fully closed state of FIG. 5; FIG. 7 is a longitudinal sectional view showing an inlet passage of a centrifugal compressor according to a fourth embodiment of the present invention together with an inlet guide vane. 8 is a transverse sectional view (a sectional view taken along the line FF) showing the fully closed state of FIG. 7; FIG. 9 is a longitudinal sectional view showing an inlet passage of a centrifugal compressor according to a fifth embodiment of the present invention, together with inlet guide vanes. FIG. 10 is a transverse sectional view (GG sectional view) showing the fully closed state of FIG. 9; FIG. 11 is a longitudinal sectional view showing an inlet passage of a centrifugal compressor according to a sixth embodiment of the present invention, together with inlet guide vanes. FIG. 12 is a longitudinal sectional view showing an inlet passage of a centrifugal compressor according to a seventh embodiment of the present invention, together with inlet guide vanes. FIG. 13 is a longitudinal sectional view showing an inlet passage of a centrifugal compressor according to the related art together with an inlet guide blade. 14 is a cross-sectional view (a cross-sectional view taken along line AA) showing the fully closed state of FIG. FIG. 15 is a longitudinal sectional view showing an inlet flow path of another centrifugal compressor according to the prior art together with an inlet guide vane. 16 is a cross-sectional view (a cross-sectional view taken along line BB) showing the fully closed state of FIG. DESCRIPTION OF SYMBOLS 1 Inlet guide blade 2 Impeller 3 Rotating shaft 4 Casing 5 Mandrel 6 Strad 14 Casing 14a Spherical part 21 Inlet guide wing 24 Casing 24a Depression 31 Inlet guide wing 35 Mandrel 35a Spherical part 41 Inlet guide wing 45 Mandrel 45a Recess 51 Entrance guide wing 51a Fixed wing 51b Flap 53 Rotation axis

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Keiichi Shiraishi             No. 1-1 Akunouracho, Nagasaki City, Nagasaki Prefecture Mitsubishi Heavy Industries             In Nagasaki Shipyard Co., Ltd. (72) Inventor Mikogami Takashi             3000 Tana, Sagamihara City, Kanagawa Prefecture Mitsubishi Heavy Industries             Sagamihara Works Co., Ltd. F term (reference) 3H034 AA02 BB03 BB06 CC03 DD04                       DD22 EE09 EE12 EE18

Claims (1)

Claims 1. A flow that is rotatably supported by a casing, is disposed in an inlet flow path on the upstream side of an impeller, and adjusts an opening degree of the impeller to control a flow flowing into the impeller. In a compressor having a plurality of inlet guide vanes that give a swirl in advance, a spherical portion that is a part of a spherical surface is formed on a portion of the inner peripheral surface of the casing that faces the casing-side end surface of the inlet guide vane. A compressor, wherein an end surface of the inlet guide vane on the casing side is formed in an arc shape concentric with the spherical portion. 2. A plurality of sheets which are rotatably supported by a casing, are disposed in an inlet flow path on the upstream side of the impeller, and adjust a degree of opening thereof to give a swirl to a flow flowing into the impeller in advance. In the compressor having the inlet guide vanes, the end surface of the inlet guide vanes on the casing side is formed in a straight line parallel to the rotation axis center line of the impeller, and the casing of the inlet guide vanes is provided on the inner peripheral surface of the casing. A flat recess parallel to the side end face, the cross section of which forms a polygonal recess having the casing-side end face of the inlet guide vane as one side. 3. A plurality of sheets which are rotatably supported by a casing, are disposed in an inlet flow path on the upstream side of the impeller, and adjust a degree of opening thereof to give a swirl to a flow flowing into the impeller in advance. And a cylindrical mandrel arranged at the center of the inlet passage and extending in the direction of the passage so as to make the inflow to the impeller uniform, and the outer peripheral surface of the mandrel A spherical portion which is a part of the spherical surface is formed at a portion of the inlet guide vane opposite to the end surface of the mandrel side, and the end surface of the inlet guide vane facing the mandrel facing the spherical portion is concentric with the spherical portion of the mandrel. A compressor having a circular arc shape. 4. A plurality of sheets which are rotatably supported by a casing, are disposed in an inlet flow path on the upstream side of the impeller, and adjust a degree of opening thereof to give a swirl to a flow flowing into the impeller in advance. And a cylindrical mandrel arranged at the center of the inlet flow passage and extending in the flow passage direction in order to make the flow to the impeller uniform, Is formed in a straight line parallel to the center axis of the rotation axis of the impeller, and of the outer peripheral surface of the mandrel,
A portion of the inlet guide vane opposite to the end face on the mandrel side is a recess having a flat shape parallel to the end face on the mandrel side of the inlet guide vane, and its cross-sectional shape is one side of the end face on the mandrel side of the inlet guide vane. A compressor characterized by forming a polygonal concave portion. 5. A plurality of sheets which are rotatably supported by a casing, are disposed in an inlet flow path on the upstream side of the impeller, and adjust a degree of opening thereof to give a swirl to a flow flowing into the impeller in advance. And a cylindrical mandrel arranged at the center of the inlet flow path and extending in the direction of the flow path to make the flow into the impeller uniform, The fixed wing is divided into a fixed flap with a short chord length on the downstream side, and the fixed wing has a function as a stradd for supporting the mandrel, and the flap is rotatably supported on the casing via a rotating shaft. A compressor characterized in that: 6. A plurality of sheets which are rotatably supported by a casing, are disposed in an inlet flow path on the upstream side of the impeller, and adjust a degree of opening thereof to give a swirl to a flow flowing into the impeller in advance. And a cylindrical mandrel arranged at the center of the inlet flow passage and extending in the flow passage direction so as to evenly flow into the impeller. A part of the spherical surface which is a part of the spherical surface is formed on a portion of the inlet guide vane facing the casing side end surface, and the casing side end surface of the inlet guide vane is formed in an arc shape concentric with the spherical part. In the outer peripheral surface, a spherical portion which is a part of a spherical surface is formed at a portion opposed to the end surface of the inlet guide vane on the mandrel side, and the mandrel side end surface of the inlet guide vane opposed to this spherical portion is attached to the mandrel. Arc shape concentric with the spherical part of Compressor and wherein the door. 7. A plurality of sheets which are rotatably supported by a casing, are disposed in an inlet flow path on the upstream side of the impeller, and adjust a degree of opening thereof to give a swirl to a flow flowing into the impeller in advance. And a cylindrical mandrel arranged in the center of the inlet flow passage and extending in the flow passage direction in order to make the inflow to the impeller uniform, the casing side of the inlet guide vane Is formed in a straight line parallel to the center line of the rotation axis of the impeller, and the inner peripheral surface of the casing is a recess having a planar shape parallel to the casing-side end surface of the inlet guide vane. The surface shape forms a polygonal concave portion having the side face on the casing side of the inlet guide vane as a side, and the end face on the mandrel side of the inlet guide vane is formed in a straight line parallel to the rotation axis center line of the impeller. Of the outer surface of the mandrel, the entrance guide wing The part opposing the end face on the mandrel side is a recess having a planar shape parallel to the end face on the mandrel side of the inlet guide vane, and the cross-sectional shape of which is a polygon whose one side is the end face on the mandrel side of the inlet guide vane. A compressor characterized in that a concave portion is formed. 8. A plurality of sheets which are rotatably supported by a casing, are disposed in an inlet flow path on the upstream side of the impeller, and adjust a degree of opening thereof to give a swirl to a flow flowing into the impeller in advance. And a cylindrical mandrel arranged in the center of the inlet flow passage and extending in the flow passage direction in order to make the inflow to the impeller uniform, the casing side of the inlet guide vane Is formed in a straight line parallel to the center line of the rotation axis of the impeller, and the inner peripheral surface of the casing is a recess having a planar shape parallel to the casing-side end surface of the inlet guide vane. The surface shape forms a polygonal concave portion with the casing-side end face of the inlet guide vane as one side, and further, of the outer peripheral surface of the mandrel, a part of the spherical surface in a portion opposed to the mandrel-side end face of the inlet guide vane And a spherical part that is Part end face of the mandrel side of the opposing inlet guide vane, a compressor, characterized in that the mandrel of the spherical portion and the concentric arc shape. 9. A plurality of sheets which are rotatably supported by a casing, are disposed in an inlet flow path on the upstream side of the impeller, and adjust a degree of opening thereof to give a swirl to a flow flowing into the impeller in advance. And a cylindrical mandrel arranged at the center of the inlet flow passage and extending in the flow passage direction so as to evenly flow into the impeller. A part of the spherical surface, which is a part of the spherical surface, is formed at a portion of the inlet guide vane opposite to the casing-side end surface, and the casing-side end surface of the inlet guide vane has an arc shape concentric with the spherical part. The end face on the mandrel side of the guide vane is formed in a straight line parallel to the center axis of the rotation shaft of the impeller, and a portion of the outer peripheral surface of the mandrel opposite to the end face on the mandrel side of the inlet guide vane has an inlet guide. Plane shape parallel to the end face on the mandrel side of the wing A recess, a compressor, characterized in that the cross-sectional shape to form a concave polygon to a side end face of the mandrel side of the inlet guide vane. 10. The compressor according to claim 1 or claim 9, wherein a spherical portion of the inner peripheral surface of the casing facing an end surface of the inlet guide vane on the casing side is an impeller. A compressor characterized by being part of a spherical surface centered on a point on an extension of a rotation axis center line. 11. The compressor according to claim 3 or claim 8, wherein, of the outer peripheral surface of the mandrel, a spherical portion facing the mandrel-side end surface of the inlet guide vane has a rotation of the impeller. A compressor characterized by being part of a spherical surface centered on a point on an extension of a shaft center line. 12. The compressor according to claim 6, wherein, of the inner peripheral surface of the casing, the end surface on the casing side of the inlet guide vane, and the outer peripheral surface of the mandrel, the end surface on the stem side of the inlet guide vane. The compressor according to claim 1, wherein the spherical portion opposing the first portion is a part of a spherical surface centered on a point on an extension of the rotation axis center line of the impeller.