JPS59208221A - Method of fitting rotary body to shaft - Google Patents

Abstract

PURPOSE:To contrive to fit simply and rapidly the rotatary body to a shaft at an arbitrary location in axial lengthwise direction by a method wherein a tapered sleeve which is contracted in diameter by the fluid pressure is inserted between a rotatary body and a shaft, then the rotatary body and shaft are fixed. CONSTITUTION:In case that an impeller 5b is detachably attached to a shaft 1, initially, a distance piece 2 is inserted to the shaft 1; secondly, a tapered sleeve 6b is fitted to the impeller fitting part 1a of the shaft 1 in the manner that an inserting space 11 of the impeller 5b is kept at the external periphery of the tapered sleeve 6b, then a pressurized oil is fed into an oil groove 10b through a pressurized oil inlet 9b. The taper sleeve 6b is contracted toward axial center direction by the oil pressure, a clearance 7 is eliminated, then an allowance for compression is obtained, while the slight clearance is generated between the external periphery of the taper sleeve 6b and the internal periphery of the impeller 5b. Thereby, the impeller 5b is inserted with a hydraulic pressure fitting device in axial lengthwise direction until the inserting space 11 disappears.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for attaching a rotating body to a shaft, such as an impeller, which can be easily and quickly mounted at any position in the longitudinal direction of the shaft.

In rotary fluid machines such as conveyors, compressors, pumps, and turbines, impellers are repeatedly attached and detached for research and development of static flow paths (inlet guide vanes, return guide vanes) around impellers, and shaft It is necessary to change the installation position in the longitudinal direction from the previous installation position.

An example of the conventional method for removing an impeller is explained with reference to Fig. 1.A keyway is applied to the shaft a, and the impeller C is heated with a burner or the like to achieve an interference fit, and is heated to transmit torque. is fitted onto shaft a via key d. However, in the case of such a mounting method, in order to arbitrarily change the longitudinal position (axial position) of the impeller C, the length of the keyway must be set to a considerable length with respect to the axis a. (), which is difficult to process, and because the impeller C is an interference fit, it must be heated, making key alignment difficult and requiring a dynamic balance test after assembly. The problem is that it requires a lot of time and effort.

Another example of the conventional impeller mounting method will be explained with reference to FIG. The tip of the penetrating bottle e is inserted into the shaft a to fix the impeller C. However, in the case of such a mounting method, a pilot hole for inserting the bottle e must be prepared in advance in the boss part of the impeller C.
After positioning the impeller C, the hole must be repaired and the bottle e installed, which makes the work complicated.Moreover, as in the case of Fig. 1, a dynamic balance test is required after assembly. There is also the problem that it requires a lot of time and effort.

In view of the above points, the present invention provides a keyway and a pin for the shaft (
The object of this invention is to eliminate the need for drilling holes for I-insertion, and to enable a rotating body such as an impeller to be easily and quickly placed at any position in the longitudinal direction of the shaft.

According to the present invention, a thin tapered sleeve with a taper for press-fitting on the outer periphery and a small gap between the rotating body and the shaft is fitted on the inner periphery between the rotating body and the shaft that fixes the rotating body. death,
The tapered sleeve is contracted toward the center of the shaft to reduce its diameter by fluid pressure to generate an interference, and the rotating body is pushed in the longitudinal direction of the shaft and in the direction where the outer diameter of the tapered sleeve is larger, thereby reducing the interference of the tapered sleeve. This fixes the rotating body to the shaft.

Therefore, the rotating body can be easily and quickly mounted at any position in the longitudinal direction of the shaft, and there is no need to perform a dynamic balance test after mounting.

Embodiments of the present invention will be described below with reference to the drawings.

3 and 4 illustrate the case where the impeller is provided in two stages. The impeller mounting portion 1a of the shaft 1 is machined to have the same diameter even when a plurality of impellers are mounted, and one end side of the impeller mounting portion 1a of the shaft 1 is provided with a step for holding down the fitted distance piece 2. A screw 1C is provided on the other end side of the impeller mounting portion 1a of the shaft 1, into which the shaft end nut 3 is screwed. Further, on the outer periphery of the blade-shaped portion 1a of the shaft 1, a plurality of ring-shaped grooves 1a for inserting the shaft 1 and the shaft ring 4 are provided at required intervals in the direction of the shaft length (the third
In the figure, only one set of grooves 1d is illustrated). Impeller mounting part 1 of shaft 1
The 1st stage impeller 5a and 2nd stage impeller 5b are attached to a, and between the 1st stage impeller 5a and the impeller attachment part 1a of the shaft 1, and between the 2nd stage impeller 5b and the shaft 1. Taper sleeves ea and eb can be fitted between the thorns of the impeller mounting portion 1a, respectively. Furthermore, a distance piece 12 for maintaining the interval between the impellers 5a and 5b at a predetermined distance is attached between the first stage impeller 5a and the second stage type mold 5b.

Each of the tapered sleeves 6a and 6b has a thin cylindrical shape,
The outer diameter is larger on the stepped portion 1b side of the shaft 1 and smaller on the screw 1C side, and the overall diameter is tapered. The diameter of the hole in the tapered sleeves 6a, 6b is the same over the entire length, and when no contraction force is applied to the tapered sleeve 6a, 61+ toward the axial center, the diameter of the hole in the tapered sleeve 6a, 6b is the same as the inner circumference of the hole in the tapered sleeve 6a, 6b. There is a very small gap 7 between the shaft 1 and the outer periphery of the impeller mounting part 1a so as to generate an interference margin. Further, the holes in the portions of the first stage impeller 5a and the second stage type type 5b that fit into the tapered sleeves 6a and 6b are tapered to match the tapered sleeves 6a and eb,
In addition, the maximum and minimum diameters of the tapered holes are smaller than the maximum and minimum outer diameters of the tapered sleeves 6a and 6b when no contraction force is applied to the tapered sleeves 6a and 6b toward the axial center side. ing. Furthermore, the first stage impeller 5a
The two-stage mold 5b is provided with a straight hole that communicates with the tapered hole, and the inner periphery of the hole and the impeller mounting portion 1 of the shaft 1 are connected to each other.
A predetermined gap 8 is provided between a and a.

Hydraulic inlets 9a, 9b are provided in the boss portions of the first-stage impeller/seed mold 5a and the second-stage seed mold 5m toward the center of the shaft 1. An oil groove 10a is provided on the inner circumference and opens to the outer circumference of the tapered sleeve.
, 10b. Note that 11 in the figure is a push-in type.

Next, the procedure for installing the impeller will be explained.

First, a distance piece 2 of a predetermined length is selected depending on where the impeller is to be placed in the longitudinal direction of the shaft, and the distance piece 2 is fitted into the blade type part 1a of the shaft 1, and the end is attached to the shaft. 1, and then taper sleeve 6
a to the vane-shaped portion 1a of the shaft 1, and fit the two-stage type 5b to the outer periphery of the tapered sleeve 6b so that there is a push-in type 11 as shown in Fig. 4, and the hydraulic inlet. Pressure oil is supplied from 9b to the oil groove 10b. Therefore, the tapered sleeve 6b contracts toward the axial center, and the gap 7
As a result, a tightening margin is generated and a small gap is created between the outer periphery of the tapered sleeve 6b and the inner periphery of the two-stage type mold 5b. Push the push type 11 toward the distance piece 2 along the direction until the push type 11 becomes zero, and the side surface of the two-stage type mold 5b is brought into contact with the distance piece 2.

By pushing the two-stage type mold 5b toward the distance piece 2 side until the pushing type becomes zero, the gap 1 between the 1-bar sleeve 6b and the impeller mounting portion 1a of the shaft 1 disappears, and the taper sleeve 6b 1 is an interference fit, and the tapered sleeve 6b and the two-stage separate mold 5b are also an interference fit. Therefore, the rotation of shaft 1 from 1 to 100 degrees is possible without any problem.
It becomes possible to transmit the information to b.

When the two-stage type mold 5b is attached to a predetermined position on the shaft 1, the two-split stop ring 4 is fitted into the groove 1d of the shaft 1 to fix the position of the two-stage type mold 5b in the longitudinal direction of the shaft. Next, the distance piece 12 is fitted to the impeller mounting portion 1a of the shaft 1, and the distance piece 12 is attached to the stop ring 4.
, and fit the tapered sleeve 6a to the vane-shaped part (=1 part 1a) of the shaft 1.
A first-stage impeller 5a is shown in FIG. 4 on the outer periphery of 76b. As in the case of the 12-stage impeller 5b, they are fitted so as to be push-type, and pressurized oil is supplied from the hydraulic inlet 9a to the oil groove 10a.

Therefore, the tapered sleeve 6a is the tapered sleeve 6b.
Similarly, it contracts toward the center of the axis. Therefore, the first stage impeller 5a is pushed in along the longitudinal direction of the shaft using a hydraulic device (not shown) until the pushing distance on the distance piece 12 side becomes zero.
The side surface of the first stage impeller 5a is brought into contact with the distance piece 12.

By pushing the first-stage impeller 5a toward the distance piece 12 until the push-in ratio becomes zero, the gap 7 between the tapered sleeve 6a and the blade attachment portion 1a of the shaft 1 disappears, and the tapered sleeve 6a is moved against the shaft 1. The taper three 76a and the first stage impeller 5a are also tightly fitted. Therefore, the rotational torque of the shaft 1 is maintained without any problem by the first stage impeller 5a.
be able to communicate to After the first-stage impeller 5a is placed in a predetermined position on the shaft 1, screw the shaft end knurl l-3 onto the screw 1C of the shaft 1, and the first-stage impeller 5a is attached to the shaft 1. Make sure that it cannot be handled from the vehicle mounting part 1a.

When @1 is rotated by the drive device, the 1st stage impeller 5812 2nd stage impeller 51)
rotates. The gap 7 is sufficiently small so that the tapered sleeves 76a and 6b do not contract, and the tapered sleeves Ga,
61) Since the outer periphery has a tapered shape, the tapered sleeve 6a is formed by hydraulic pressure.

The first-stage impeller 581 and the second-stage impeller 5b are firmly fixed to the shaft 1 via the first-stage impeller 581 and the second-stage impeller 5b. Therefore, it does not become impossible to transmit torque from the shaft 1 to the impeller during operation.

Further, the axial force due to the pressure increase of the impellers 5a and 5b is supported by the stop ring 4 and the shaft end nut No. 3 (each independently).

When removing the 1st stage impeller 5812 2nd stage impeller 5b, should I perform the work in the reverse order of the installation procedure? 1'' Explanation will be omitted.

1st stage impeller 581) 2nd stage impeller 51)
When changing the mounting position of the distance piece 2,
12 is made to have a different length, and the impeller is attached as described above, but the stop ring 4 is fitted into the groove 1d located at a different position from the groove 1d. Distance piece 2.12 has a low production cost, so even if several types are prepared, there is only one type of impeller, which has a high production cost, so it is economically advantageous, and distance piece 2.1
2, it becomes possible to attach one or more impellers to any position on the blade-shaped portion 1a of the shaft 1.

In addition, by making the blade shape of the shaft (= one part has the same diameter), which is expensive to produce, it becomes possible to share the shaft 1 for various combinations of impellers, and it is easy to use a simple hydraulic press-in device. can be attached to and detached from the shaft, and the shaft 1 and the impeller 5a
, 5b can be sufficiently satisfied as a high-speed rotating body even if a dynamic balance test is not carried out in the assembled state after press-fitting, if the dynamic balance test is carried out in a single state.

In addition, in the embodiment of the present invention, the impeller is 2
11.Installation [Although we have explained the case of nozzle, it is not limited to 2 sets, it can be a thin set, and it can be applied not only to the inside of the blade but also to various rotating parts.The shrinkage of the tapered sleeve and the press-fitting of the impeller are not limited to hydraulic pressure. Of course, it is possible to apply the following fluids, and various other changes may be made without departing from the gist of the present invention.

According to the method of attaching a rotating body to the shaft of the present invention, (I)
By contracting the tapered sleeve and press-fitting the rotating body, there is no need for heating as in conventional methods, and the rotating body can be fixed to the shaft easily and quickly, and it can also be removed easily and quickly. (■) By adjusting the length of the distance piece, the rotating body can be mounted at any position in the longitudinal direction of the shaft. It is very advantageous for ([) not only the case of a single rotating body, but also the combination study of multiple rotating bodies with respect to the same axis, which makes it possible to share parts. It is possible. [Phase] It is possible to assemble a rotating body that satisfies high-speed rotation by simply conducting a dynamic test on the rotating body and the shaft individually. .

[Brief explanation of drawings]

Figures 1 and 2 are explanatory diagrams of the conventional method of attaching the rotating body to the shaft. Figure 1 is an explanatory diagram of the case where the rotating body is an interference fit and fixed with a key, and Figure 2 is an explanatory diagram of the case where the rotating body is tightly fitted and fixed with a key. FIG. 3 is an explanatory diagram of the method of attaching the rotating body to the shaft of the present invention, and FIG. 4 is an enlarged view of section IV in FIG. 3. In the figure, 1 is the shaft, 1a is the impeller mounting part, 2 is the distance piece, 3 is the shaft end nut, 4 is the stop ring, and 5a is 1
Danbetsu Ne City, 5b is 2 Danbetsu Neton, 1 is gap, 10a, 10
b indicates an oil groove, 11 indicates a push-in type, and 12 indicates a distance piece. Patent application Hitoshi Kawajima Harima Heavy Industries Co., Ltd.

Claims (1)

[Claims] 1) Between the rotating body and the shaft that fixes the rotating body, a thin tapered sleeve is fitted on the outer circumference for press-fitting and has a slight gap between the outer circumference of the shaft and the fluid pressure. The tapered sleeve is contracted to reduce its diameter to generate a tightening margin, and the rotating body is pushed in the longitudinal direction of the shaft and in the direction in which the outer diameter of the tapered sleeve is larger, and the tightening margin of the tapered sleeve causes the rotating body to be rotated around the shaft. A method for attaching a rotating body to a shaft, which is characterized by fixing the body.