JPH0637596U - Stationary operation ring - Google Patents

Abstract

(57) [Abstract] [Purpose] To accurately guide the operating ring by the low-cost axial movement type. [Structure] A lever is attached to the shaft of a stationary blade, and a pin at the tip of the lever is engaged with a circumferential groove of an operating ring 20 provided on the outer periphery of the vehicle compartment, and the operating ring 20 is moved in the axial direction to change the blade angle. In the stationary vane operation ring, a protrusion composed of a plurality of pins 25 and rollers 26 is provided on the outer periphery of the operation ring 20, and the roller 26 is fitted to the bracket 24 fixed to the vehicle compartment. A thread groove 27 is provided, and the operating ring 20 is moved in the axial direction to adjust the vane blade angle.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a stationary vane operating ring of a type in which a plurality of stages of stationary vane mounting angles are operated by a compressor during operation.

[0002]

[Prior art]

 Conventionally, in a compressor, it is often required from the viewpoint of the performance of the compressor to change the mounting angles of a plurality of stages of stator vanes during operation. In that case, attach a stationary blade by attaching a lever to the shaft of the stationary blade, providing a pin at the tip of the lever, engaging the pin with the groove of the operating ring provided on the outer periphery of the vehicle compartment, and moving the operating ring. I was trying to change the corners. In this case, there are two types of movements of the operation ring: one that moves in the axial direction and one that rotates. 8 and 9 show a conventional example in which the operation ring is moved in the axial direction to operate the blade angle. FIG. 9 shows the relationship between the lever of the stationary blade 2 and the operating ring 1, and is an enlarged view of the D portion of FIG. The operation ring 1 is supported at its outer peripheral portion by a plurality of support shafts 12 via a bush 13 so as to be slidable in the axial direction, and both ends of the support shaft 12 are fixed to the vehicle compartment. As described above, the operation ring 1 is slidably supported without being tilted in the axial direction, and is moved in the axial direction by the servo motor 11. In addition, 10 is an arrow indicating the moving direction of the operating ring 1, 3 in FIG. 9 is an operating pin, and 4 is a stationary blade shaft.

[0003]

[Problems to be solved by the device]

 Generally, the most important thing in operating the stationary blade mounting angle during operation is that all the stationary blades 2 in each stage maintain the same angle. If the blade angles vary within one row, the blades before and after that stage will pass through the flow that fluctuates during one rotation, and the cyclic fluctuating force may lead to fatigue fracture. is there. Therefore, in order to eliminate variations in blade angles within each row, the operating ring must always be guided and moved without tilting or falling. The reaction force of the flow of each stationary vane and the frictional force of each sliding part work on the operation ring. Although these forces are slightly different for each wing, the total force is roughly at the center because all the wings are evenly distributed on the circumference.

On the other hand, since the point of application of the operating force is on the outer circumference of the operating ring, a moment always acts on the operating ring 1, and the moment is borne by the two bushes 13 in FIG. Work like tilting one. Also, the reaction force that resists this moment increases as the distance between the bushes 13 decreases, causing wear of the bushes 13 and the support shaft 12, increase of frictional force, increase of deformation of the support shaft 12, or abrasion of the bushes 13 and the support shaft 12. There was a problem that the operating ring 1 was greatly tilted when it was worn and loosened. Therefore, in order to support the operation ring 1 so as not to tilt, it is desirable to increase the distance between the bushes 13 that resist moments as much as possible. The number of variable vane stages of the compressor varies depending on the performance required of the compressor, but most of them are about several stages forward. Then, in this case, as shown in FIG. 8, the operating ring 1 has a shorter length than its diameter. That is, the bush support interval is shorter than the moment of the operating force (which is proportional to the radius), and the operating ring 1 is likely to tilt. Therefore, even with respect to the short operating ring 1, a supporting method that effectively resists the moment due to the operating force, that is, the supporting interval is long and the inclination is difficult, has been strongly desired. The present invention has been proposed to solve the above conventional problems.

[0005]

[Means for Solving the Problems]

 For this reason, the present invention makes the stator blade mounting angle of the compressor variable.A lever is attached to the shaft of the stator blade, and a pin at the tip of the lever is installed in the circumferential groove of the operating ring provided on the outer periphery of the vehicle compartment. In a stationary vane operating ring in which the operating ring is moved in the axial direction to change the blade angle, a plurality of protrusions are provided on the outer periphery of the operating ring, and a partial screw that fits into the protrusion Fix the bracket with the groove in the vehicle compartment, or provide the bracket with a projection and provide a screw groove in which the projection fits into the operation ring and rotate the operation ring to move the operation ring in the axial direction. It adjusts the vane angle of the stationary blade, and this is the means to solve the problem.

[0006]

In the present invention, a plurality of protrusions and a bracket having a partial thread groove to be fitted to the protrusions are provided on the circumference, and the operation ring is supported and rotated by the bracket. According to the present invention, by appropriately selecting the lead of the thread groove, it is possible to arbitrarily determine the amount of circumferential operation with respect to the amount of movement in the required axial direction to a value preferable for the servomotor.

[0007]

【Example】

 The present invention will be described below with reference to the embodiments of the drawings. FIGS. 1 to 7 show the embodiments of the present invention. Reference numeral 20 denotes an operation ring, which is provided with a protrusion on the outer circumference, that is, a pin 25 and a roller 26 in the figure. On the other hand, the bracket 24 fixed to the vehicle compartment is provided with a partial thread groove 27. The inner peripheral side of the bracket 24 also serves as the outer peripheral support surface of the operation ring 20. Depending on the magnitude of the operating force, this bearing surface can also reduce the frictional force by using an appropriate rolling bearing. Further, the roller 26 is fitted in the partial thread groove 27 of the bracket 24 and rotates the operation ring 20 in the circumferential direction, so that the roller advances in the screw advancement axis direction. On the other hand, the bracket 24 may be provided with a projection, the operation ring 20 may be provided with a screw groove into which the projection is fitted, and the operation ring 20 may be rotated.

In the conventional example shown in FIG. 8, since two supporting points that resist moment in the length direction are provided, it is not possible to set a wide supporting point interval. In the embodiment of the present invention, supporting points are arranged on the circumference as shown in FIG. By the way, in order to support the operation ring 20, it is needless to say that the operation ring 20 must effectively resist the moment, but first, the operation ring 20 must always be guided without being tilted. Therefore, in the present invention, a plurality of protrusions on the circumference (geometrically, the plane is determined by three points. Therefore, the supporting points must be at least three points. If there are four or more points, all are the same. If it is not the size, it will become statically indeterminate support. In reality, elastic deformation and some backlash are unavoidable, so 4 places, 5 places, etc. are also adopted.) A bracket 24 having (part of the circumference) 27 is provided to support the operation ring 20. Then, the operation ring 20 is rotated.

Then, the operation ring 20 is moved in the axial direction by an amount corresponding to the advance of the screw at each support point. If each support point has a geometrically equal thread groove, the operating ring 20 moves in the axial direction without tilting. Since the operating ring 20 must be fixed laterally, the inner circumference of the bracket in FIGS. 2 to 7 also serves as a guide that prevents lateral movement and allows movement only in the axial direction. The protrusions use rollers to reduce friction.

[0010]

[Effect of device]

 As described in detail above, according to the present invention, there are two types of operating rings, one operating in the axial direction and the other operating in the circumferential direction as described above. A hole must be provided in the radial direction that engages with the pin hole of the corresponding lever. However, it is extremely costly to machine a large number of holes in the radial direction at precise positions. The axial movement type is advantageous in terms of manufacturing cost. However, it is more difficult for the axial movement type to guide accurately so that it does not tilt or fall than the circumferential movement type. However, according to the present invention, even with the axial movement type, the operation ring can be guided with higher accuracy than before. The manufacturing cost of brackets, pins, rollers, etc. is not much different from that of conventional support shafts, seats and bushes that support them.

[Brief description of drawings]

FIG. 1 is a partial sectional side view of a vane operating ring showing an embodiment of the present invention.

FIG. 2 is a sectional front view of part 1 in FIG.

FIG. 3 is an enlarged cross-sectional view of a portion A of FIG.

FIG. 4 is an enlarged cross-sectional view of portion B of FIG.

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

FIG. 6 is a perspective view of the bracket in FIG.

7 is a perspective view showing a part of the operation ring provided with the protrusion shown in FIG.

FIG. 8 is a side sectional view of an operating ring portion in a conventional compressor.

9 is a detailed view of a D portion in FIG.

[Explanation of symbols]

 20 Operating Ring 21 Operating Ear 22 Direction Operating by Servo Motor 23 Moving Direction of Operating Rod 24 Bracket 25 Pin 26 Roller 27 Screw Groove 28 Bolt for fixing the bracket to the passenger compartment

 ─────────────────────────────────────────────────── ─── 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] Claim: What is claimed is: 1. A stator blade mounting angle of a compressor is variable, wherein a lever is attached to the shaft of the stator blade, and a pin at the tip of the lever is engaged with a circumferential groove of an operating ring provided on the outer periphery of the vehicle compartment. In the stationary vane operating ring in which the operating ring is moved in the axial direction to change the blade angle, a plurality of protrusions are provided on the outer periphery of the operating ring, and a partial thread groove that fits into the protrusion is provided. By fixing the provided bracket to the passenger compartment, or by providing the bracket with a projection and providing a screw groove into which the projection fits, and rotating the operation ring, the operation ring moves in the axial direction and the stationary blade A stationary vane operating ring characterized by adjusting the angle.