JPH0637501U - Stationary wing shroud - Google Patents

Abstract

(57) [Summary] [Objective] The shaft integrated with the vane fixed through the shroud and the through hole of the shroud have a simple shape to facilitate the machining of the shaft and the through hole and reduce the cost. A part for attaching an inner shroud of a stationary blade 1 capable of arbitrarily changing a blade angle of a fluid machine to a blade, a shaft 21 is provided on an inner diameter side of the stationary blade 1, and a front side 23 and a rear side 2 are provided.
The shroud shaft holes that are used as one body by combining 5 are simple through holes 23a and 25a, and the shroud dividing surface 23 is formed in the cutout portion 22 formed in the shaft 21 that is fitted in the holes.
The semicircular hole portion of the ring 24 fitted in the groove 31 provided in b or 25b is fitted so as to restrict the movement of the shroud of the stationary blade 20 in the outer and inner circumferential directions. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vane shroud used in a compressor in which the vane angle of the vane is variable during operation.

[0002]

[Prior art]

 FIG. 9 is a cross-sectional view showing a stationary blade portion of a compressor in which the conventional stationary blade blade angle can be changed during operation, and FIG. 10 is an enlarged partial exploded view of a B portion of FIG. The shroud (front side 5, rear side 6) should be in contact with the rotor with a small clearance on the inner diameter side to minimize leakage between stages. Therefore, the shroud must be held in its exact position by the vane 1. On the other hand, the stationary blade 1 rotates. Therefore, the shaft 2 is provided on the inner diameter side of the stationary blade 1, and the small diameter portion 3 is formed between the stationary blade 1 and the collar 4. Further, the shroud is provided with a hole 10 that fits into the shaft 2, but along the center of the coaxial shaft 10, the shroud is divided into a front side 5 and a rear side 6. As a matter of course, the portion where the small diameter portion 3 of the shaft 2 fits into the hole 10 where the shaft 2 fits is also a small diameter hole. The shroud is assembled so that the shaft 2 is tied together from the front and back by the divided front side 5 and rear side 6 rings, and is held by the vane 1.

[0003]

[Problems to be solved by the device]

 In the shroud, the holes 10 having a large number of precise fitting tolerances must be opened in the radial direction according to the intervals of the stationary blades 1, that is, a large number of holes 10 must be formed. It has a step with a small diameter part on the way, and the position of that step must be accurate. Moreover, the stationary blade 1 must also be precisely integrated with the shaft 2 provided with the step by the small diameter portion 3. Therefore, it takes a long time to process both the hole 10 and the shaft 2 and there is a drawback that the cost becomes high. The present invention has been proposed to solve the above conventional problems.

[0004]

[Means for Solving the Problems] Therefore, the present invention is a portion for attaching an inner shroud of a stationary blade to a blade capable of arbitrarily changing the blade angle of a fluid machine. On the other hand, in a shroud of a vane, which is provided with a hole into which the coaxial fits in the shroud, and which is divided into two parts at the center of the shaft hole in the front and rear, a cutout is provided in the shaft, and the shroud A groove is provided on the dividing surface side in the circumferential direction, and the opposite surface side of the ring formed so as to fit into the groove is adapted to be fitted into the cutout portion of the shaft. Is the means of.

[0005]

[Action]

 Insert the ring into the circumferential groove formed on the front or rear split surface of the shroud, and insert the notch of the shaft connected to the vane into the hole on the opposite side of the ring. The hole in the semicircular hole formed on the front side or the rear side, and then apply the semicircular hole on the rear surface of the shroud or on the front side to the coaxial opposite surface. After making contact with the dividing surfaces of, and fixing, the vane shroud is formed. In the shroud of the present invention, the shaft connected to the stationary blade has a cylindrical shape with the same diameter, and the hole of the shroud in which the coaxial is fitted is also a simple through hole without a step, so that the step is not required as in the conventional case. Compared to the machining of the shaft and the hole, the machining time can be significantly shortened and the manufacturing cost can be further reduced even if the notch and the ring are machined.

[0006]

【Example】

 The present invention will be described below with reference to the embodiments of the drawings. FIGS. 1 to 8 show the embodiments of the present invention. First, referring to the first embodiment shown in FIGS. 1 to 6, 20 is a stationary blade, 21 is a shaft integrally provided on the inner diameter side of the stationary blade, and a notch 22 is formed in one side portion in the middle. The collar 27 is provided at the lower end. Reference numeral 23 is the front side of the shroud, 25 is the rear side of the shroud, and semicircular holes 23a and 25a of the same diameter are formed in the vertical direction (inner and outer peripheral direction) on the respective dividing surfaces 23b and 25b side. When the divided surfaces of the front side 23 and the rear side 25 are aligned, a circular hole having the same diameter as the shaft 21 is formed. Further, the lengths of the holes 23a and 25a in the inner and outer peripheral directions are substantially the same as the length of the shaft 21 between the stationary blade 20 and the collar 27.

Reference numeral 31 denotes a groove formed in the central portion of the dividing surface 23b of the front side 23 forming the shroud in the circumferential direction. The groove 31 is formed in the circumferential direction of the portion corresponding to the cutout portion 22 of the shaft 21. It is formed with the same width as the width of the notch portion 22, the annular ring 24 is fitted in the groove 31, and the split surface 23b side of the annular ring 24 has a semicircular hole 23a for the shaft 21. When it is fitted inside, the split surface 25b of the rear side 25 of the shroud is divided into the cutout portions 23 of the front side so that the side surface opposite to the shaft 21 fits into the semi-circular hole 25a. When brought into contact with the surface 23b, the outer peripheral surface of the shaft 21 comes into close contact with the circular holes formed by the holes 23a and 25a. After that, the bolts 26 are screwed from the hole 23c side of the front side 23 through the hole 24c of the ring 24 into the hole 25c of the rear side 25, so that the front side 23 and the rear side 25 are integrated with the shaft 21 sandwiched. The shroud is configured so that the movement of the shroud in the inner circumferential direction is restricted by the notch 22 of the shaft 21 engaging with the ring 24, and the movement of the shroud in the outer circumferential direction is determined by the collar 27 of the shroud. It is regulated by contacting. In this case, the contact between the inner and outer peripheral surfaces of the annular ring 24 and the upper and lower surfaces of the cutout portion 22 of the shaft 21 is line contact. Further, the contact between the flange 27 and the inner diameter of the shroud is an approximate line contact, but since a particularly large external force does not act on the shroud, there is no practical problem. Although the groove 31 is formed on the front side 23 in FIG. 1, this groove may be formed on the rear side 25.

Next, FIGS. 7 and 8 show a second embodiment of the present invention in which the ring 24 'has a structure different from that of the ring 24 of the first embodiment, and the collar 27 on the shaft 21 is eliminated. It differs from the first embodiment in that a shaft 21 'is provided. The inner side of the circular ring 24 'fitted in the groove 31 of the front side 23 has the same structure as the circular ring 24 of FIG. 1, but the inner and outer peripheral surfaces of the front side, which are the portions fitted into the notches of the shaft 21', are The polygonal shape has surfaces 29 and 30 of which the number of sides is equal to the number of sides, and is designed to come into contact with the upper and lower surfaces of the cutout portion 22 of the shaft 21 '. Although the polygon is formed on both inner and outer surfaces of the ring 28 in FIG. 8, it may be formed on only one surface. Further, since the inner circumference and / or the outer circumference is formed in a polygonal shape so as to come into surface contact with the upper and lower surfaces of the cutout portion 22, the collar 27 may be omitted as described above. The shroud of the present invention is divided into two horizontally or four horizontally in consideration of the difference in thermal expansion and contraction with the ordinary passenger compartment.

[0009]

[Effect of device]

 As described in detail above, according to the present invention, the shaft connected to the vane has a cylindrical shape with the same diameter, and the shroud hole to which the coaxial fits is also a simple through hole without a step. Compared with machining a shaft with a step and a hole, even if machining with a notch and an annulus is carried out, the machining time can be greatly shortened compared to the past and the manufacturing cost can be further reduced. it can.

[Brief description of drawings]

FIG. 1 is an exploded view showing a cross-section of a shroud of a vane and each member in a perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line CC of FIG.

3 is a sectional view taken along line D-D of FIG.

FIG. 4 is a front view showing a split surface on the rear side of the shroud.

5 is a front view of the lower end of the shaft in FIG. 1 viewed from the cutout side.

6 is a cross-sectional view showing an engaged state between a shroud rear portion and a shaft lower end portion of a portion A in FIG.

FIG. 7 is a side sectional view of a shroud of a vane showing a second embodiment of the present invention.

8 is a perspective view showing a part of the ring used in FIG. 7. FIG.

FIG. 9 is a cross-sectional view showing a part of a shroud portion of a conventional compressor.

10 is an enlarged view of part B in FIG. 9 and an exploded perspective view of parts.

[Explanation of symbols]

 20 Stator Blade 21 Shaft on Inner Diameter Side 22 Notch 23 Front Side of Shroud 23a, 25a Semicircular Holes 23b, 25b Dividing Surface 24 Ring 25 Rear Side of Shroud 26 Bolt 27 Tsuba

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Wataru Fujioka 2-8-25 Niihama, Arai-cho, Takasago-shi, Hyogo Takahishi Engineering Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A portion for attaching an inner shroud of a stationary blade to a blade capable of arbitrarily changing a blade angle of a fluid machine, wherein a shaft is provided on an inner diameter side of the stationary blade, and a shaft is coaxially fitted into the shroud. And a shroud of a vane, which is obtained by dividing the shroud into two in the front and rear at the center of the shaft hole, a notch is provided in the shaft, and a groove is provided in the circumferential direction on the split surface side of the shroud. A shroud for a vane, characterized in that an opposite surface side of an annular ring formed so as to be fitted into the shaft is fitted into a cutout portion of the shaft.