JP4738490B2 - Rotating body balance adjustment method - Google Patents

Description

  The present invention relates to a balance adjusting method for a rotating body that is used in a rotating machine or the like and includes a rotating shaft and a plurality of members to be assembled to the rotating shaft.

  Conventionally, in a rotating machine that rotates a rotating body at a high speed and generates a desired output, if the rotating body is unbalanced, it may cause vibrations and so on. It has been broken. Specifically, in a turbofan engine, a balance weight is installed in front of and behind a fan that is an assembled member that is assembled to an inner shaft that is a rotating shaft constituting a rotating body, and the balance is obtained by cutting them. Adjustment is performed (for example, refer to Patent Document 1).

JP 2001-342993 A

  However, according to the Vance adjustment method of Patent Document 1, in the rotating body, the balance is only adjusted by a single member to be assembled provided on the rotating shaft, and a plurality of members to be assembled are assembled. As a result, the balance of each of the other members to be assembled and the rotating body could not be adjusted after all.

  The present invention has been made in view of the above-described circumstances, and reliably eliminates the unbalance of a rotating body configured by assembling a plurality of members to be assembled to a rotating shaft, thereby preventing vibration during rotation. The present invention provides a balance adjustment method for a rotating body that can be performed.

In order to solve the above problems, the present invention proposes the following means.
The present invention relates to a method for adjusting the balance of a rotating body when a rotating body is constituted by assembling a plurality of substantially disk-shaped assembled members on a rotating shaft, and a member assembling step for assembling one assembled member on the rotating shaft; A displacement measuring step of measuring an axial displacement distribution along a circumferential direction of the one assembled member assembled on the rotating shaft, and based on the measured displacement distribution of the one assembled member, A first adjustment step of calculating an unbalance amount of one member to be assembled and adjusting the weight on two different surfaces orthogonal to the rotation axis of the one member to be assembled; the member assembly step; and the displacement measurement. And performing the first adjustment step on each of the assembled members formed of two of the plurality, and determining the unbalanced amount of the assembled rotating shaft and the entire assembled member, The rotation including the position of the center of gravity of each member to be assembled. A second adjustment step for adjusting the weight on two surfaces orthogonal to the axis, the member assembly step, the displacement measurement step, the first adjustment step, and the second adjustment step. It is characterized in that the members to be assembled are grouped in two and each group is implemented.

  According to this method, after assembling one of the plurality of members to be assembled in the member assembling process to the rotating shaft, the displacement measurement process measures the axial displacement distribution along the circumferential direction of the one assembling member. By doing so, it is possible to grasp the balance state of one member to be assembled in the state assembled to the rotating shaft. For this reason, in the first adjustment step, the unbalance amount can be calculated based on the displacement distribution, and the balance of one assembled member that is assembled by adjusting the weight on two sides based on this result can be calculated. Can be adjusted. Similarly, with respect to the other members to be assembled that form a pair with the one member to be assembled, the member assembly process, the displacement measurement process, and the first adjustment process are performed, so that the other members to be assembled can also be rotated. The balance can be adjusted in the assembled state. Next, as a second adjustment step, the unbalanced amount of the assembled rotating shaft and the entire assembly target member was obtained, and the weight was adjusted on the two surfaces set on the assembly target member forming the above-described set, thereby assembling. The balance of the rotating shaft and the entire assembly target member can be adjusted. Here, by setting the two surfaces as surfaces orthogonal to the rotation axis including the position of the center of gravity of each member to be assembled, the balance of each member to be assembled performed in each first adjustment step is lost. The overall balance can be adjusted. Then, by performing the above-described series of processes for each set of a plurality of members to be assembled, in a state where all the members to be assembled are assembled, the balance of each member to be assembled and the balance of the entire rotating body Can be adjusted.

In the balance adjustment method of the rotating body, in the first adjustment step, it is more preferable to adjust the weight by calculating an even unbalance amount as the unbalance amount.
According to this method, it is possible to adjust the overall balance while sequentially eliminating even-numbered imbalances in a state where the members to be assembled are assembled.

In the balance adjustment method for a rotating body, in the first adjustment step, it is more preferable to adjust the weight by calculating a dynamic unbalance amount as the unbalance amount.
According to this method, it is possible to adjust the overall balance while sequentially eliminating each of the dynamic imbalance, that is, the even imbalance and the static imbalance in a state in which each member to be assembled is assembled.

  In the rotating body balance adjusting method of the present invention, it is possible to reliably eliminate the unbalance of the rotating body configured by assembling a plurality of members to be assembled to the rotating shaft, and to prevent generation of vibration during rotation.

It is sectional drawing which shows the compressor provided with the rotary body adjusted with the balance adjustment method of embodiment of this invention. It is a flowchart which shows the balance adjustment method of the rotary body of the 1st Embodiment of this invention. It is explanatory drawing explaining the member assembly process, one displacement measurement process, and the 1st adjustment process in the balance adjustment method of the rotary body of the 1st Embodiment of this invention. It is explanatory drawing explaining the other displacement measurement process and the 1st adjustment process in the balance adjustment method of the rotary body of the 1st Embodiment of this invention. It is explanatory drawing explaining the 2nd adjustment process in the balance adjustment method of the rotary body of the 1st Embodiment of this invention. It is a flowchart which shows the balance adjustment method of the rotary body of the 2nd Embodiment of this invention. It is a flowchart which shows the balance adjustment method of the rotary body of the 3rd Embodiment of this invention.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a compressor as an example of a rotating machine having a rotating body adjusted by the balance adjusting method of the present embodiment. As shown in FIG. 1, the compressor 1 includes a casing 2 that forms an outer shell, a rotating shaft 11 that is supported so as to be rotatable about an axis with respect to the casing 2, and a member to be assembled to the rotating shaft 11. A rotating body 10 including a plurality of impellers 12, and a diaphragm 4 disposed around the rotating shaft 11 and the impeller 12 so as to form a plurality of continuous working chambers 3 between the impellers 12. . The housing 2 is provided with a suction port 5 through which a fluid flows in and a discharge port 6 through which it flows out, and a seal 7 that prevents the fluid from flowing out of the housing 2 along the rotating shaft 11. ing. Each of the impellers 12 includes a substantially disk-shaped main body 12a, a plurality of wings 12b erected on one surface of the main body 12a on the suction port 5 side, and a shroud 12c formed at the tip of the wing 12b. The gas flowing along the axial direction can be discharged radially outward by a flow path 12d formed by the main body 12a, the wing 12b, and the shroud 12c. An inlet guide vane 8 is provided between the suction port 5 and the impellers 12E and 12F closest to the suction port 5.

  In such a compressor 1, a rotational force is transmitted from the outside to the rotating shaft 11, and the impeller 12 rotates. The fluid flows in from the suction port 5, the flow direction into the impeller 12 is adjusted by the inlet guide vanes 8, is compressed by the impeller 12 rotating in the working chamber 3, and flows out from the discharge port 6. When the flow rate of the fluid flowing in changes, the rotational speed of the rotary shaft 11 is changed so as to keep the fluid pressure at the discharge port 6 constant. Here, the rotating body 10 composed of the rotating shaft 11 and the impeller 12 rotates at a high speed, and if an unbalance occurs, vibration is generated due to the unbalance, so that balance adjustment is performed during assembly. Yes. Below, the balance adjustment method of this embodiment is demonstrated.

  FIG. 2 shows a flowchart of the balance adjustment method of the present embodiment. Here, in the present embodiment, the plurality of impellers 12 (12A, 12B, 12C, 12D, 12E, 12F) are paired in order from the center in the axial direction, that is, the impellers 12A, 12B are the first set, the impeller 12C, The following steps are performed for each group, with two groups formed so that 12D is the second group and impellers 12E and 12F are the third group. First, as shown in FIGS. 2 and 3, first, as a member assembly step S <b> 1, the impellers 12 </ b> A and 12 </ b> B that are the first set closest to the axial center position are assembled to the rotating shaft 11.

  Next, as the displacement measurement step S2A, surface runout measurement is performed on one impeller 12A. That is, the wing 12b is not provided, and the dial gauge D is arranged at a predetermined position on the outer peripheral side in the radial direction on the other surface 12e of the main body 12a forming a plane. Then, by rotating the rotating shaft 11 around the axis, the axial displacement distribution is measured along the circumferential direction.

  Next, balance adjustment is performed about one impeller 12A as 1st adjustment process S3A. First, as an unbalance amount of the impeller 12A, an even unbalance amount is calculated based on the measured displacement distribution (step S3Aa). Note that the shape, dimensions, weight, and the like of the impeller 12A are acquired in advance as information necessary for calculating the unbalance amount. And it is necessary to adjust to eliminate the even disparity obtained at the positions of the two surfaces La1 and La2 set in advance so as to be orthogonal to the rotating shaft 11 on both sides in the axial direction across the gravity center position G12a. The weights Ma1, Ma2 and the circumferential position for adjusting the weight are calculated. Actually, the weights Ma1 and Ma2 are adjusted at the calculated circumferential positions of the two surfaces La1 and La2, that is, the weights are installed, or the impeller 12A itself is cut (step S3Ab). Thereby, a balance can be adjusted about the even disparity by the surface runout of one assembled impeller 12A.

  Next, the same process is performed on the other impeller 12B of the first set. That is, first, as shown in FIGS. 2 and 4, as the displacement measuring step S <b> 2 </ b> B, the displacement distribution is similarly measured using the dial gauge D for the other impeller 12 </ b> B. Next, as the first adjustment step S3B, an even unbalance amount is calculated from the displacement distribution (step S3Ba), and adjustments based on the weights Mb1 and Mb2 to eliminate this are performed on both sides in the axial direction across the gravity center position G12b. The two surfaces Lb1 and Lb2 set in advance so as to be orthogonal to the rotating shaft 11 are performed (step S3Bb). Thereby, a balance can be adjusted also about the even disparity by the surface runout of the other assembled impeller 12B. As described above, after the displacement measurement process and the first adjustment process are performed for each of the impellers 12A and 12B forming a pair, the process proceeds to the second adjustment process S4.

  As shown in FIGS. 2 and 5, in the second adjustment step S <b> 4, first, in a state where the pair of impellers 12 </ b> A and 12 </ b> B are assembled to the rotating shaft 11, these are rotated together to measure the amount of dynamic imbalance. (Step S4a). Note that the measurement of the amount of dynamic imbalance is performed by a known balance machine. Then, adjustment is made to eliminate the obtained dynamic imbalance at the positions of the two surfaces Lga and Lga that are set in advance so as to be orthogonal to the rotation shaft 11 including the gravity center positions G12a and G12b of the impellers 12A and 12B. Necessary weights Na and Nb, and a circumferential position for adjusting the weight are calculated. Actually, the weights Na and Nb are adjusted at the calculated circumferential positions of the two surfaces Lga and Lgb (step S4b), thereby adjusting the balance of the assembled rotary shaft 11 and the impellers 12A and 12B as a whole. can do. Here, the two surfaces Lga and Lgb are set in a plane orthogonal to the rotary shaft 11 including the gravity center positions G12a and G12b of the impellers 12A and 12B, so that the first adjustment steps S3A and S3B are performed. The overall balance can be adjusted without losing the even balance between the impellers 12A and 12B.

  When all the impellers 12 are assembled after finishing the second adjustment step S4, the assembly and balance adjustment of the rotating body 10 are completed (step S5). In the above, since only the two impellers 12A and 12B, which are the first group, are still assembled, the member assembly steps S1 to S2 of the second group of impellers 12C and 12D are next performed. A series of steps up to the adjustment step S4 are similarly performed. In this way, by performing a series of steps from the member assembly step S1 to the second adjustment step S4 in all sets of impellers 12, all the impellers 12 are rotated in a state where the balance is adjusted respectively. As well as being assembled to the shaft 11, the balance of the rotator 10 as a whole can be adjusted, the unbalance of the rotator 10 can be reliably eliminated, and the occurrence of vibrations when the compressor 1 is assembled and rotated is prevented. Can do.

( Reference example )
A reference example will be described with reference to FIG. Since the process diagram is basically the same as that of the first embodiment, it will be described with reference to FIGS. Moreover, in this embodiment, the same code | symbol is attached | subjected to the member or process common to the member or process used in embodiment mentioned above, and the description is abbreviate | omitted.

  As shown in FIGS. 6 and 3, also in the present embodiment, as in the first embodiment, first, the first set of impellers 12A and 12B is assembled as the member assembling step S1. Next, as the displacement measurement step S2A, the surface runout measurement is performed on one impeller 12A. Next, balance adjustment is performed about one impeller 12A as 1st adjustment process S10A. First, as the unbalance amount of the impeller 12A, the dynamic unbalance amount is calculated based on the measured displacement distribution (step S10Aa). The weights Ma1, Ma2, and the weights that need to be adjusted to eliminate the obtained dynamic imbalance at the positions of the two surfaces La1 and La2 that are set in advance in the axial direction on both sides of the gravity center position G12a. The position in the circumferential direction for adjusting is calculated. Actually, the weights Ma1 and Ma2 are adjusted, that is, the weights are installed, or the impeller 12A itself is cut at the calculated circumferential positions of the two surfaces La1 and La2 (step S10Ab). Thereby, a balance can be adjusted about the dynamic imbalance by the surface runout of one assembled impeller 12A.

  Next, the same process is performed on the other impeller 12B of the first set. That is, first, as shown in FIGS. 6 and 4, as a displacement measurement step S2B, the displacement distribution is similarly measured using the dial gauge D for the other impeller 12B. Next, as the first adjustment step S10B, the amount of dynamic imbalance is calculated from the displacement distribution (step S10Ba), and the adjustment by the weights Mb1 and Mb2 to eliminate this is performed on both sides in the axial direction with the gravity center position G12b interposed therebetween. Further, it is performed for each of the two surfaces Lb1 and Lb2 set in advance (step S10Bb). Thereby, a balance can be adjusted also about the dynamic imbalance by the surface runout of the other impeller 12B assembled. Here, in this embodiment, since balance adjustment is performed so as to eliminate dynamic imbalance for each of the impellers 12A and 12B, when the first adjustment process of both the impellers 12A and 12B is completed, as a whole The balance adjustment has also been completed. For this reason, even if it does not implement 2nd adjustment process S4 of 1st Embodiment, it can be set as the state in which the rotational axis 11 assembled and the impeller 12A, 12B whole dynamic balance were taken.

  As described above, when the displacement measurement process and the first adjustment process are performed for each of the impellers 12A and 12B forming the set, after step S5, not all the impellers 12 are completed. Then, the process proceeds to the member assembling process S1, and the same process from the member assembling process S1 to the first adjusting process S10B is performed for the next set of impellers 12. And when it completes about all the sets of impellers 12, the assembly and balance adjustment of the rotary body 10 are complete | finished. In this way, by performing a series of steps from the member assembly step S1 to the first adjustment step S10B in all sets of impellers 12, all the impellers 12 rotate in a state in which the balance is adjusted respectively. As well as being assembled to the shaft 11, the balance of the rotator 10 as a whole can be adjusted, the unbalance of the rotator 10 can be reliably eliminated, and the occurrence of vibrations when the compressor 1 is assembled and rotated is prevented. Can do. In the present embodiment, in the first adjustment steps S10A and S10B, the weight adjustment is performed so as to eliminate the dynamic imbalance of each impeller 12, so that the second adjustment step can be omitted. Can be reduced.

(Second Embodiment)
The second embodiment of the present invention will be described with reference to FIG. The process diagram is basically the same as that of the first embodiment, and will be described with reference to FIGS. Moreover, in this embodiment, the same code | symbol is attached | subjected to the member or process common to the member or process used in embodiment mentioned above, and the description is abbreviate | omitted.

As shown in FIG. 7, this embodiment is intended to implement the basic reference example and the same process, different from the reference example, the adjustment for each set of impeller 12 from the member assembling process S1 first The second adjustment step S11 is performed after the step S10B. As shown in FIG.7 and FIG.5, in 2nd adjustment process S11, it is the same as 2nd adjustment process S4 of 1st Embodiment with respect to the impeller 12 which makes the group which completed the 1st adjustment process. Make adjustments. That is, taking the impellers 12A and 12B as an example as shown in FIG. 5, first, in a state where the pair of impellers 12A and 12B are assembled to the rotating shaft 11, they are rotated together to measure the amount of dynamic imbalance. (Step S11a). The weights Na and Ng that need to be adjusted to eliminate the found dynamic imbalance at the positions of the two preset surfaces Lga and Lga of the impellers 12A and 12B, and the circumference for adjusting the weight. Calculate the position of the direction. And actually, the balance of the assembled rotating shaft 11 and the impellers 12A and 12B is adjusted by adjusting the weight Na and Ng at the calculated circumferential positions of the two surfaces Lga and Lgb (step S11b). can do. Here, the two surfaces Lga and Lgb are set to surfaces orthogonal to the rotation shaft 11 including the gravity centers G12a and G12b of the impellers 12A and 12B, respectively. Overall balance adjustment can be performed without the dynamic balance of the impellers 12A and 12B performed in the adjustment steps S10A and S10B being lost.

  Then, a series of steps from the member assembly step S1 to the second adjustment step S11 is performed by each set of impellers 12, so that all the impellers 12 are assembled to the rotating shaft 11 in a state where the balance is adjusted as each. In addition, the balance of the rotator 10 as a whole can be adjusted, the unbalance of the rotator 10 can be reliably eliminated, and the occurrence of vibrations when the compressor 1 is assembled and rotated can be prevented. In the present embodiment, the second adjustment step S11 is further performed in addition to the balance adjustment performed in the second embodiment, so that the dynamic imbalance of the entire rotating body 10 is more reliably eliminated. The balance can be adjusted.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

  In each of the above-described embodiments, the assembly of the two impellers 12 forming each group is simultaneously performed as a member assembly step S1 prior to the respective displacement measurement steps S2A and S2B and the first adjustment steps S3A and S3B. However, the present invention is not limited to this, and only the corresponding one of the impellers 12 may be assembled to the rotating shaft 11 as a member assembling process immediately before each of the displacement measuring steps S2A and S2B. In the second embodiment, since the second adjustment process is not performed, the first adjustment process is sequentially performed from the member assembly process one by one without separating the plurality of impellers 12. You may do it. In each of the above embodiments, the grouping of the plurality of impellers 12 is a pair of left and right from the center in the axial direction, but is not limited thereto. However, with the above configuration, the assembly and balance adjustment can be performed substantially symmetrically in the axial direction, which is more preferable.

  Moreover, in this embodiment, although the balance adjustment of the rotary body 10 of the compressor 1 was demonstrated as an example, it is not restricted to this, The rotary body comprised by assembling several to-be-assembled members with respect to a rotating shaft. The same applies to the same.

10 Rotating body 11 Rotating shaft 12, 12A, 12B, 12C, 12D, 12E, 12F Impeller (member to be assembled)
S1 Member assembly process S2A, S2B Displacement measurement process S3A, S3B, S10A, S10B First adjustment process S4, S11 Second adjustment process

Claims (3)

A rotating body balance adjustment method for assembling a plurality of substantially disc-shaped members to be assembled on a rotating shaft,
A member assembling step for assembling one to-be-assembled member on the rotating shaft;
A displacement measuring step of measuring a displacement distribution in an axial direction along a circumferential direction of the one member to be assembled assembled to the rotating shaft;
Based on the measured displacement distribution of the one member to be assembled, the unbalance amount of the one member to be assembled is calculated, and the weight is adjusted on two different surfaces orthogonal to the rotation axis of the one member to be assembled. A first adjustment step for performing
After the member assembling step, the displacement measuring step, and the first adjusting step are performed on each of the members to be assembled that are formed of two of a plurality of members, the assembled rotating shaft and the entire member to be assembled A second adjustment step of obtaining an unbalance amount and adjusting the weight on two surfaces orthogonal to the rotation axis, each including the position of the center of gravity of the assembly target member forming the set,
The member assembling step, the displacement measuring step, the first adjusting step, and the second adjusting step are performed in each set by forming a set of two to-be-assembled members. Rotating body balance adjustment method. It is the balance adjustment method of the rotary body of Claim 1, Comprising:
In the first adjustment step, the balance adjustment method for a rotating body is characterized in that an even unbalance amount is calculated as the unbalance amount to adjust the weight. It is the balance adjustment method of the rotary body of Claim 1, Comprising:
In the first adjustment step, the balance adjustment method for a rotating body is characterized in that a dynamic unbalance amount is calculated as the unbalance amount to adjust the weight.

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