JP2007032626A - Dynamic vibration absorbing device for rotating machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dynamic vibration absorbing device for a rotating machine capable of effectively reducing vibration of the rotating machine even while being easy to install without using a complicated mechanism. <P>SOLUTION: The dynamic vibration absorbing device for the rotating machine is provided with an elastic member 2 attached to a tip side of an electric motor 3, being an opposite side via a center position of gravity of the rotating machine 3 with respect to a flange 51 of a frame 5 of a vertical shaft pump 6, being an installation base part to a foundation 4 to be a supporting point of vibrating motion of the electric motor 3, being the rotating machine provided in an upper end side of the vertical shaft pump 6, and having a rotary shaft in a vertical direction, and a weight 1 provided more to a tip side of the electric motor 3 via the elastic member 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a dynamic vibration damping device for a rotary machine, and more particularly to a dynamic vibration damping device for a rotary machine that effectively reduces vibrations of the rotary machine despite being easily mounted.

  In a rotating machine such as a pump or a motor, a resonance phenomenon occurs when the natural frequency of the system is close to the excitation frequency depending on the installation state of the machine, and this vibration phenomenon may cause excessive vibration in the rotating machine. . In this case, it is a general measure to increase the rigidity by reinforcing the mounting structure of the machine so that the natural frequency is separated from the excitation frequency. However, if it is difficult to change the structure, a dynamic vibration absorber should be used. It is considered valid.

  For this reason, conventionally, various dynamic vibration damping devices have been proposed for mechanical structures. For example, there are several “dynamic vibration damping devices” in Patent Document 1 and “tower structure vibration damping devices” in Patent Document 2. Such measures are disclosed. FIG. 17 shows a specific example of a conventional vibration damping device applied to the vertical shaft pump 6. In the vertical shaft pump 6 shown in FIG. 17, the electric motor 3 is installed on the frame 5 of the vertical shaft pump 6 installed on the foundation 4. A barrel casing 61 of the pump 6 is installed under the stand 5 of the vertical shaft pump 6, and the impeller 62 inside the barrel casing 61 is rotated by driving of the electric motor 3, and fluid is discharged from the suction port 63 to the discharge port. Pump to 64.

  The vibration phenomenon in such a vertical shaft pump will be described with reference to FIG. FIG. 4 is an explanatory view showing a state of vibration of the vertical shaft pump 6 in a state where the dynamic vibration absorber is not attached. As shown in FIG. 4, the vertical rigidity of the flange 51 of the gantry 5 of the vertical pump 6 allows the vertical pump 6 to rotate about the flange 51 around an axis perpendicular to the drawing. Since the heavy motor 3 is installed on the stand 5 of the vertical shaft pump 6 and the center of gravity 39 is at a high position, the natural frequency of this system is relatively low, and the rotational frequency of the motor 3 is high. If the frequency of the fluid force acting on the vertical shaft pump 6 is approached, excessive vibration may be generated in the horizontal direction as indicated by an arrow in the upper part of the electric motor 3 due to resonance.

  As a countermeasure for reducing the vibration in this problem, the natural frequency is separated from the excitation frequency, the reinforcement is added to the flange 51 of the gantry 5 of the vertical shaft pump 6 to enhance the rigidity, or the natural frequency is increased. It is conceivable as a specific measure to change the natural frequency by, for example, reducing the natural frequency by attaching a weight to the body. However, the former measure is hardly effective when the rigidity of the foundation 4 on which the flange 51 is installed is low. In this case, it is necessary to reinforce the foundation 4. For this purpose, it is difficult to reinforce the foundation 4 because a large-scale civil engineering work must be performed. In the latter case, the natural frequency is almost inversely proportional to the square root of the mass of the electric motor 3, so that a very large mass must be added to obtain a sufficient effect. However, since the additional mass is limited due to the load resistance of the foundation 4, sufficient effects are often not obtained. Thus, the dynamic vibration absorber is an effective measure when it is difficult to change the structure.

  Returning again to FIG. 17, FIG. 17 shows the configuration of the dynamic vibration damping device disclosed in Patent Document 2, and in FIG. 17, the dynamic vibration damping device 7 is attached to the side surface of the electric motor 3. A weight 71 of the dynamic vibration absorber 7 is supported by a linear bearing 73 installed on a pedestal 74 so as to be movable in the horizontal direction, and is connected to a flange 75 via a spring 72. The flange 75 is fixed to the side surface of the electric motor 3 using a mounting bolt 76.

The conventional dynamic vibration absorber disclosed in Patent Document 2 is characterized in that it is unitized as a device. On the other hand, to install the dynamic vibration absorber 7, the mounting surface of the flange 75 is ground on the motor 3. Such as drilling or drilling bolt holes. Since operations such as grinding and drilling are difficult to implement at the installation location, the motor 3 is once transported to a factory or the like and the dynamic vibration absorber 7 is attached. In this case, the electric motor 3 must be disassembled from the vertical shaft pump 6. For this reason, in the prior art, in addition to the installation of the dynamic vibration absorber 7 main body in the construction, the motor 3 is disassembled, carried out, processed as a prior work, and after the installation, the motor 3 is reassembled or the coupling alignment is adjusted. In addition, there is a drawback that it takes a long time to install the dynamic vibration absorber 7.
Japanese Patent No. 310086 JP 2003-278827 A

  An object of the present invention is to provide a dynamic vibration damping device for a rotary machine that can reduce vibrations of the rotary machine effectively without using a complicated mechanism while being easy to mount.

  In order to solve the above-mentioned problem, a dynamic vibration damping device for a rotary machine according to claim 1 as a basic configuration of the present invention is provided in the upper end side of the foundation structure and has a horizontal axis of the rotary machine having a rotary shaft in the vertical direction. An elastic member attached to a distal end side of the rotating machine that is opposite to the attachment base of the rotating machine and the mounting base of the rotating machine via the center of gravity of the rotating machine; and the elastic member And a weight provided further on the tip side of the rotary machine.

  According to a second aspect of the present invention, in the dynamic vibration damping device for a rotary machine according to the first aspect, the elastic member is a hollow elastic member having a hollow pipe shape, and the weight is fixed to a tip of the rotary machine. The weight is attached to the front end surface of the rotating machine by a through bolt that passes through the hollow pipe and the hole of the mounting base.

  According to a third aspect of the present invention, in the dynamic vibration damping device for a rotary machine according to the second aspect, the hollow elastic member is divided into a plurality of parts in a direction crossing the central axis.

  According to a fourth aspect of the present invention, in the dynamic vibration damping device for a rotary machine according to the first aspect, the elastic member includes a stud bolt that attaches the elastic member to the rotary machine. After the position of the weight is adjusted, the stud bolt is fixed by the tip and the nut.

  According to a fifth aspect of the present invention, in the dynamic vibration damping device for a rotary machine according to any one of the first to fourth aspects, the elastic member has a second moment in section in two orthogonal directions in the section. It is characterized by having different cross-sectional shapes.

  According to a sixth aspect of the present invention, in the dynamic vibration damping device for a rotary machine according to any one of the first to fifth aspects, the weight has an opening for ventilation.

  According to a seventh aspect of the present invention, in the dynamic vibration damping device for a rotary machine according to the sixth aspect, a fan cover is attached to the weight, and a protective cover is attached to the opening of the weight. It is characterized by being.

  A dynamic vibration damping device for a rotary machine according to an eighth aspect of the present invention is the dynamic vibration damping device according to any one of the first to seventh aspects, wherein the weight is formed by laminating a plurality of plate weights. It is characterized by that.

  According to a ninth aspect of the present invention, in the dynamic vibration damping device for a rotary machine according to the eighth aspect, a vibration isolating rubber is inserted between the pedestals holding the plurality of plate weights.

  Furthermore, the dynamic vibration damping device for a rotary machine according to claim 10 is the one according to claim 8 or 9, wherein the plurality of plate weights are stacked to form a weight, and Anti-vibration rubber is inserted between the upper and lower plate weights of the plurality of plate weights.

  A dynamic vibration damping device for a rotary machine according to an eleventh aspect is the one according to any one of the eighth to tenth aspects, wherein the plurality of plate weights are stacked to form the weight. The plate weight and a pedestal that holds the plate weight are provided with a bolt hole, and the plate weight and the pedestal are coupled by fastening with a mounting bolt that passes through the bolt hole. It is characterized by that.

  A dynamic vibration damping device for a rotary machine according to a twelfth aspect is the one according to any one of the first to eleventh aspects, wherein the rotary machine having a rotary shaft is installed at a vertical pump and an upper end of the vertical pump. And an electric motor that drives the vertical shaft pump.

  As described above, the present invention can provide a dynamic vibration damping device for a rotary machine that can effectively reduce vibration of the rotary machine while being easy to attach without using a complicated mechanism.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a dynamic vibration damping device for a rotary machine according to the present invention will be described in detail with reference to the accompanying drawings.

[First Embodiment]
1st Embodiment respond | corresponds to the dynamic vibration damper of the rotary machine which concerns on Claim 1, The structure of 1st Embodiment is demonstrated using FIG. 1 thru | or FIG. FIG. 1 is an explanatory diagram showing a configuration when a dynamic vibration damping device for a rotary machine according to the present invention is applied to a vertical shaft pump. In the dynamic vibration damping device according to the first embodiment, the elastic member 2 is installed on the upper end of the motor 3 that is the farthest position above the gantry flange 51 that is a fulcrum of vibration with respect to the center of gravity of the motor 3. In addition, the weight 1 of the dynamic vibration absorber is attached to the tip of the elastic member 2.

  The electric motor 3 is provided on the upper end side of a rotary machine such as a vertical shaft pump 6 and has a rotary shaft in the vertical direction. The center of gravity of the electric motor 3 is the same as that described with reference to FIG. Is located at the center of gravity position 39. This center-of-gravity position 39 is above the flange 51 of the gantry 5 of the vertical shaft pump 6 as a fulcrum for the vibration motion of the electric motor 3. Since the center of gravity position 39 is above the flange 51 of the pedestal 5 as a fulcrum, the motor 3 is driven above the center of gravity position 39 to generate a horizontal vibration motion with a larger amplitude than below. In the first embodiment, an elastic member 2 and a weight 1 as a vibration damping mechanism are attached to the upper end side of the electric motor 3 that generates this vibration motion.

  In FIG. 1, an electric motor 3 as a driving means is placed and fixed on a stand 5 of a vertical shaft pump 6 as a rotating machine, and the stand 5 of the vertical shaft pump 6 is installed on a foundation 4 by a flange 51. The elastic member 2 is attached to the upper end of the electric motor 3 on the side opposite to the flange 51 (the fulcrum of vibration) of the gantry 5 of the vertical shaft 6 fixed to the foundation 4 around the center of gravity position 39. A weight 1 is provided at the tip of the elastic member 2.

  In other words, such a configuration is the flange of the stand 5 of the vertical pump 6 that is provided at the upper end side of the vertical pump 6 and is a mounting base of the electric motor 3 that serves as a fulcrum of the vibration motion of the electric motor 3 having a rotating shaft in the vertical direction. 51, the elastic member 2 attached to the tip side of the motor 3 on the opposite side through the center of gravity position 39 of the motor 3, and the weight provided on the tip side of the motor 3 further through the elastic member 2 1 is provided.

  FIG. 2 is an explanatory view showing the detailed structure of the dynamic vibration damping device according to the present invention. The weight 1 of the dynamic vibration absorber is composed of a weight plate 11 as a plate weight and a weight adjusting weight 19 fixed by a mounting bolt 14. The weight plate 11 has a round bar 28. Are welded. A mounting seat 29 is fixed to the lower end of the round bar 28 by welding. In order to operate as a dynamic vibration absorber, the natural frequency of the mass system composed of the weight 1 and the elastic member 2 is adjusted to match the natural frequency of the electric motor 3 by adjusting the mass of the weight 19 for mass adjustment.

  FIG. 3 is a cross-sectional view showing the structure of the electric motor 3 in a state before the dynamic vibration absorber is attached. A screw hole 33 for attaching the upper bearing bracket 32 is provided in the upper part of the frame 31 of the electric motor 3, and a bolt hole 27 at the same position as the screw hole 33 is formed in the flange surface of the frame 31 for fixing. The upper bearing bracket 32 is attached to the frame 31 by passing the bolt 35 through the bolt hole 27 and tightening it into the screw hole 33. In FIG. 3, the mounting seat 29 is not shown because the dynamic vibration absorber is not attached. However, when the dynamic vibration absorber is attached, it is fixed through the bolt holes 27 on the flange surface of the frame 31 as shown in FIG. The mounting seat 29 is attached to the frame 31 together with the upper bearing bracket 32 by tightening into the screw hole 33 through the bolt 35. In this mounting seat 29, the lower end of the round bar 28 as the elastic member 2 is aligned and positioned in advance, and the outer peripheral portion of the round bar 28 is fixed to the mounting seat 29 by welding.

  As described above, the weight plate 11 and the round bar 28 as the elastic member 2 can be attached to the electric motor 3. The operation of the dynamic vibration absorber configured in this way will be described. As shown in FIG. 4, the vibration generated in the upper portion of the vertical shaft pump 6 is caused by a motion that rotates around the axis perpendicular to the drawing around the fulcrum of the flange 51. As shown in FIG. 1, the weight 1 supported by the round bar 28 as the elastic member 2 installed in the electric motor 3 is allowed to translate in the horizontal direction due to the bending rigidity of the round bar 28. As described above, since the natural frequency of the mass system composed of the weight 1 and the elastic member 2 matches the natural frequency of the electric motor 3, it operates as a dynamic vibration absorber for the vibration of the electric motor 3. In this case, the natural frequency of the electric motor 3 is inversely proportional to the square of the distance H from the flange 51, which is a fulcrum of vibration, to the center of gravity 39 due to the effect of the moment, as shown in FIG. That is, if the mass is arranged at a position away from the flange 51, a larger change can be caused to the natural frequency even with the same mass.

In the present invention, the elastic member 2 and the weight 1 as a dynamic vibration absorber are placed on the upper part of the motor 3 farthest away from the flange 51 with respect to the center of gravity 39 on a straight line connecting the flange 51 and the center of gravity 39 as a fulcrum of vibration. By attaching, the mass of the dynamic vibration absorber can be equivalent to (L / H) ² times that when attached to the position of the center of gravity. Since the length of the elastic member 2 is added to the actual length L of the weight 1 of the dynamic vibration absorber, the effect can be further increased.

  As described above, in the present invention, the dynamic vibration absorber is installed at the upper end of the rotating machine that is in the opposite direction to the vibration fulcrum as viewed from the center of gravity and is the farthest position. Therefore, it is necessary to provide a bearing bracket at the end of the rotating machine in order to attach the bearing. For this reason, as shown in FIG. 2, the screw hole 33 for tightening the bolt which attaches the bearing bracket 32 to a rotary machine main body is processed in the main-body end part of a rotary machine. In the electric motor 3, a screw hole 33 for attaching the bearing bracket 32 to the end of the frame 31 is provided. On the other hand, a mounting hole is machined at the same position as the screw hole 33 in the mounting seat 29 to which the round bar 28 is welded. In the first embodiment of the present invention, since the contact screw hole 33 for attaching the dynamic vibration absorber is used, the dynamic vibration absorber 1 can be attached without additional processing.

The effect of 1st Embodiment which has the structure and effect | action mentioned above is demonstrated. In the dynamic vibration absorber is a rotary machine according to the first embodiment, since the mass of the dynamic vibration absorber has a (L / H) equal to mass action and ² times the case attached to the center-of-gravity position, a large detuning with less mass An effect can be obtained. For example, when L / H is √2 (square root of 2), the mass of the dynamic vibration absorber can be reduced to 1/2 of the theoretical value (design value at the position of the center of gravity). In other words, a greater detuning effect can be obtained within the load resistance limit of the foundation 4 and the stand 5 of the vertical shaft pump 6. Thus, according to the present invention, it is possible to provide a light and small dynamic vibration absorber. On the other hand, in the dynamic vibration damping device according to the first embodiment, since the dynamic vibration damping device can be attached easily and in a short time without performing processing on the rotating machine main body, measures for reducing the vibration of the rotating machine can be realized at an early stage. be able to.

  In the conventional dynamic vibration damping device disclosed in Patent Document 2, processing such as adding a bolt hole for mounting to the rotating machine main body such as the electric motor 3 or the foundation 4 of the vertical shaft pump 6 is required to mount the device. . Since it is difficult to perform drilling and attachment work at the installation location, the dynamic vibration absorber is attached after the rotary machine body is carried out and processed. In this case, since the electric motor 3 must be disassembled from the foundation 4 of the pump 6, it takes a long period of time by adjusting the coupling alignment in addition to the reassembly of the electric motor 3, and measures can be taken in a short time. It was difficult.

  On the other hand, the dynamic vibration damping device 1 according to the first embodiment is mounted using the mounting screw holes 33 of the existing upper bearing bracket 32 of the frame 31, so that the foundation of a rotating machine such as the electric motor 3 or a pump is used. No additional processing is required on the structure body. For this reason, it becomes easy to attach the dynamic vibration absorber at the installation location, and the attachment can be completed in a short construction period.

[Second Embodiment]
Next, a dynamic vibration damping device for a rotary machine according to a second embodiment will be described with reference to FIG. This second embodiment corresponds to the configuration of claim 2. FIG. 5 is an explanatory diagram showing a configuration when the dynamic vibration damping device for a rotary machine according to the second embodiment is applied to a vertical shaft pump. In FIG. 5, a screw hole 33 for attaching the upper bearing bracket 32 is provided in the upper part of the frame 31 of the electric motor 3. The weight 1 of the dynamic vibration absorber is composed of a weight plate 11 as a plate weight and a pedestal 12 that supports the weight plate 11, and a pipe 21 is combined with the pedestal 12 so as to be in the same position as the mounting screw hole 33. The pedestal 11 is attached to the electric motor 3 by passing through the provided attachment hole 13 and the inner hole of the pipe 21 and tightening the long attachment bolt 22 into the attachment screw hole 33 of the upper bearing bracket 32. The weight plate 11 is fixed to the pedestal 12 using fixing bolts 14.

  The operation of the second embodiment having the above configuration will be described. A plurality of screw holes 33 for attaching the upper bearing bracket 32 are provided on the same circumference, usually three or more at equal intervals. An inlay 34 is provided between the upper bearing bracket 32 and the frame 31 so that the alignment of the bearing 33 can be maintained. For this reason, if any one of the plurality of mounting bolts 35 of the upper bearing bracket 32 is tightened, the alignment of the upper bearing bracket 32 will not change.

  When mounting the dynamic vibration damping device according to the second embodiment, not all of the mounting bolts of the upper bearing bracket 32 are removed at the same time, but the base 12 is fixed while removing the pipes individually and mounting the pipes 21. By working in this way, the mounting bolt 35 of the upper bearing bracket 32 can be sequentially replaced with the long mounting bolt 22 of the dynamic vibration absorber, and the pedestal 12 and the pipe 21 can be attached to the electric motor 3. During this time, the upper bearing bracket 32 is not disassembled from the frame 31.

  In addition, when the base 12 and the pipe 21 are integrated by welding at the connecting portion 23 as shown in FIG. 6, the mounting bolt 35 is first removed at one place, and then the pipe is only inserted into the screw hole 33. The long mounting bolt 22 is tightened by aligning the position 21 and shifting the angle of the pedestal 12 from the other bolt holes. Thereafter, all the other mounting bolts 35 are removed, and then the base 12 is properly aligned and the mounting bolts 35 are fastened. Also in this case, the dynamic vibration absorber can be installed without removing the upper bearing bracket 32 from the frame 31.

  In the second embodiment, since the dynamic vibration damping device 1 is mounted using the mounting screw hole 33 of the existing upper bearing bracket 32 in the frame 31, additional processing for the rotary machine main body such as the electric motor 3 and the pump 4 is not performed at all. It is unnecessary. Further, it is not necessary to disassemble the upper bearing bracket 32 by sequentially replacing the plurality of mounting bolts 22. For this reason, the installation of the dynamic vibration absorber at the installation location becomes easier and can be completed in a short construction period.

[Third Embodiment]
Next, a dynamic vibration damping device for a rotary machine according to a third embodiment will be described with reference to FIG. The third embodiment corresponds to the configuration of claim 3. FIG. 7 is an explanatory diagram showing a configuration when another dynamic vibration damping device for a rotating machine according to the present invention is applied to a vertical shaft pump. In the present invention, the pipe 21 integrated in the dynamic vibration absorber of FIG. 5 is divided into a plurality of elements 21a, 21b, 21c.

  The operation of the third embodiment based on the above configuration will be described. By dividing the pipe 21, the number and length of the pipe elements 21 a, 21 b, 21 c... Can be changed, so that the overall length as the elastic member 2 can be adjusted.

  The effect of the third embodiment will be described. As described above, in the dynamic vibration absorber, it is necessary to adjust the natural frequency of the mass system composed of the weight 1 as the mass element and the elastic member 2 so as to coincide with the natural frequency of the electric motor 3. According to the third embodiment, since the total length of the pipe 21 can be changed, the rigidity of the elastic member 2 as a beam element can be adjusted so that the natural frequency of the dynamic vibration absorber becomes a predetermined design value. .

[Fourth Embodiment]
Next, a dynamic vibration damping device for a rotary machine according to a fourth embodiment will be described with reference to FIG. The fourth embodiment corresponds to the configuration of claim 4. FIG. 8 is an explanatory view showing a configuration when another dynamic vibration damping device for a rotary machine according to the present invention is applied to a vertical shaft pump. One mounting bolt 35 of the upper bearing bracket 32 is removed from the frame 31 of the electric motor 3, the stud bolt 24 is tightened into the screw hole 33, and the nut 25 is tightened against the flange of the upper bearing bracket 32. Similarly, after sequentially replacing all the mounting bolts 35 with the stud bolts 24, the base 11 is aligned using the nuts 26 a fitted into the stud bolts 24, and then the nuts 26 b are attached from above the weight plate 11. The weight plate 12 is fixed together with the base 12 by being fastened to the stud bolt 24.

  As an operation of the fourth embodiment, the stud bolt 24 can be sequentially replaced with the mounting bolt 35. Further, as shown in FIG. 8, since the position of the base 12 in the height direction can be easily adjusted by the nut 26a, the length of the elastic member 2 as a beam element can be easily and continuously adjusted.

  As an effect of the fourth embodiment, processing to the electric motor 3 and disassembly of the upper bearing bracket 32 are unnecessary as in the first to third embodiments. Further, since the elastic member 2 can be easily changed in length, there is an advantage that the natural frequency of the dynamic vibration absorber can be accurately performed in a short time.

[Fifth Embodiment]
Next, a dynamic vibration damping device for a rotary machine according to a fifth embodiment will be described with reference to FIG. The fifth embodiment corresponds to the configuration of claim 5. In the fifth embodiment, in the second embodiment shown in FIG. 5, the shape of the cross section of the pipe 21 is set so that the secondary moment of the cross section is different between the discharge direction of the pump 6 and the discharge perpendicular direction. FIG. 9 shows an AA cross section of FIG. When the vicinity of the portion where the pipe 21 is attached is cut along the direction perpendicular to the discharge, the line AA in FIG. 5 is obtained. As shown in FIG. 9, the outer shape of the cross section of the pipe 21 is a long and narrow rectangle in the discharge direction.

  The operation of the fifth embodiment will be described. Since the secondary moment of the section of the pipe 21 is different between the discharge direction and the discharge perpendicular direction, the bending rigidity of the elastic member 2 as a beam element can be changed between the discharge direction and the discharge perpendicular direction. Further, as an effect of the fifth embodiment, the natural frequency of the electric motor 3 may be different in the discharge direction and the discharge perpendicular direction depending on the installation state of the foundation 4 and the stand 5 of the vertical shaft pump 6. In particular, the influence of piping connected to the inlet and outlet is great. For this reason, it is necessary to set the natural frequency of the dynamic vibration absorber individually in the discharge direction and the direction perpendicular to the discharge. In such a case, according to the fifth embodiment, the bending rigidity of the elastic member 2 as a beam element can be set to a different value in the discharge direction and the direction perpendicular to the discharge, so that it can be moved to a value suitable for each direction. The natural frequency of the vibration absorber can be adjusted, and the natural frequency is finely and dispersedly adjusted by the shape of the pipe 21.

[Sixth Embodiment]
Next, a dynamic vibration damping device for a rotary machine according to a sixth embodiment will be described with reference to FIG. The sixth embodiment corresponds to the configuration of claim 6. As shown in FIG. 10, the sixth embodiment is provided with an opening 15 penetrating both the weight plate 11 and the pedestal 12 in the second embodiment shown in FIG.

  The operation of the sixth embodiment will be described. In the electric motor 3, the shaft 36 is extended to the outside through the upper bearing bracket 32, the cooling fan 37 is attached to the shaft end of the shaft 36 for cooling, and the cooling air is supplied to the outer cover of the frame 31 by the fan cover 38. There is a fully-enclosed external fan type cooling system. The cooling fan 37 is a centrifugal fan that sucks air from the upper part and blows it outward in the circumference.

  Further, the weight plate 11 as the weight 1 is arranged at a position higher than the upper bearing bracket 32 by the pipe 21, and the surface area of the pipe 21 is small so that ventilation from the cooling fan is not hindered. As an effect of the sixth embodiment, an air intake path by the cooling fan 37 is secured by the opening 15, and the dynamic vibration absorber can be installed without impairing the cooling performance.

[Seventh Embodiment]
Next, a dynamic vibration damping device for a rotary machine according to a seventh embodiment will be described with reference to FIG. The seventh embodiment corresponds to the configuration of the seventh aspect. As shown in FIG. 11, the seventh embodiment fixes the fan cover 38 to the weight plate 11 and the pedestal 12 and attaches a protective cover 39 to the opening 15 in the sixth embodiment shown in FIG.

  As an operation of the seventh embodiment, the fan cover 38 is integrated with the dynamic vibration absorber. Further, as an effect of the seventh embodiment, when the fan cover 38 is provided outside the dynamic vibration absorber as in the sixth embodiment shown in FIG. 10, the size of the rotary machine is increased by installing the dynamic vibration absorber. Will come. On the other hand, in the seventh embodiment, the fan cover 38 is integrated with the dynamic vibration absorber, and the dynamic vibration absorber can be reduced in size. The fan cover 38 does not cover the upper side of the weight 1, but by providing the protective cover 39 in the opening 15, foreign matter can be prevented from being mixed and safety can be protected.

[Eighth Embodiment]
Next, a dynamic vibration damping device for a rotary machine according to an eighth embodiment will be described with reference to FIG. The eighth embodiment corresponds to the configuration of claim 8. As shown in FIG. 12, the eighth embodiment is formed by dividing the weight plate 11 into a plurality of thin plates 11a, 11b,... In the sixth embodiment shown in FIG.

  As an operation of the eighth embodiment, FIG. 13 shows a state of deformation when a vibration displacement occurs in the dynamic vibration damping device of FIG. 12 showing the eighth embodiment. When divided into thin plates and stacked, in addition to the deformation of the pipe 21 in the displacement direction indicated by the arrow in FIG. 13, shear deformation is caused in the thin plate on which the weight plate 11 is stacked. Further, as an effect of the eighth embodiment, when the weight plate 11 is divided into a laminate of the thin plates 11a, 11b,..., Shear deformation occurs in the thin plates due to vibration, and adjacent thin plates rub against each other. Since energy is consumed, damping can be increased and the vibration damping capability of the dynamic vibration absorber can be improved.

[Ninth Embodiment]
Next, a dynamic vibration damping device for a rotary machine according to a ninth embodiment will be described with reference to FIG. The ninth embodiment corresponds to the configuration of the ninth aspect. As shown in FIG. 14, the ninth embodiment is to insert the anti-vibration rubber 16 between the weight plate 11 a at the lowest stage and the pedestal 12 in the eighth embodiment shown in FIG. 12.

  As an action of the ninth embodiment, a large shear deformation is caused between the weight plate 11a and the pedestal 12 by inserting an elastic vibration-proof rubber, and the damping of the vibration-proof rubber against the shear is applied to the dynamic vibration absorber. To do. Further, as an effect of the ninth embodiment, since the damping rubber 11 can act on the weight plate 11, stronger vibration damping capability can be obtained.

[Tenth embodiment]
Next, a dynamic vibration damping device for a rotary machine according to a tenth embodiment will be described with reference to FIG. The tenth embodiment corresponds to the configuration of the tenth aspect. As shown in FIG. 15, in the tenth embodiment, the anti-vibration rubbers 16 a, 16 b,... Are inserted between the thin plates 11 a, 11 b,. Is.

  As an action of the tenth embodiment, insertion of elastic vibration-proof rubber causes a greater shear deformation between the thin plates 11a, 11b,... Constituting the weight plate 11, and the vibration-proof rubber attenuates against shear. To the dynamic vibration absorber. Further, as an effect of the tenth embodiment, since the damping plate 11 can be acted on by damping the vibration isolating rubber, stronger vibration damping capability can be obtained.

[Eleventh embodiment]
Next, a dynamic vibration damping device for a rotary machine according to an eleventh embodiment will be described with reference to FIG. This eleventh embodiment corresponds to the structure of claim 11. In the eleventh embodiment, as shown in FIG. 16, in the eighth embodiment shown in FIG. 12, a mounting hole 17 through which the mounting bolt 14 is passed is formed in the weight plate 11 and the base 12, and the mounting bolt 14 is inserted upward. Then, the weight plate 11 is fixed to the base 12 by tightening with the nut 18.

  As an effect | action of 11th Embodiment, in 8th Embodiment, since the attachment bolt 14 is fastened by the screw provided in the base 12, the lower end of the attachment bolt 14 is firmly fixed. If the restraint of the weight plate 11 by the mounting bolt 14 is weakened, the shear deformation of the weight plate 11 can be increased. In the present invention, by providing the mounting hole 17 in the pedestal 12, the inclination of the mounting bolt 14 can be made larger than that by screwing. Further, as an effect of the eleventh embodiment, since a larger shearing deformation is allowed with respect to the weight plate 11, the vibration damping ability can be improved.

[Twelfth embodiment]
Although not shown in the drawings, in the above-described dynamic vibration damping device for a rotary machine according to the first to eleventh embodiments, the rotary machine in the dynamic vibration damping device according to the twelfth embodiment includes the vertical shaft pump 6 and the pump mount 5. This is realized by using an electric motor 3 which is installed on the top and drives the vertical shaft pump 6. The twelfth embodiment corresponds to the configuration of the twelfth aspect. That is, the rotating machine having a rotating shaft may be an electric motor 3 that drives a vertical shaft pump 6 installed on a gantry 5 as shown in FIG. The dynamic vibration damping device for a rotary machine described as the first to eleventh embodiments can be applied to a rotary machine having a specific configuration as in the twelfth embodiment. The rotating machine may be any device or machine other than the vertical shaft pump and the electric motor as long as it has a rotating shaft in the vertical direction and performs a rotational motion.

The figure which shows the structure of the dynamic vibration damper of the rotary machine which concerns on 1st Embodiment of this invention. The figure which shows the structure of the dynamic vibration damper of the rotary machine which concerns on 1st Embodiment. The figure explaining the structure of the electric motor as a rotary machine of 1st Embodiment. The figure explaining the vibration state of the rotary machine which has not attached the dynamic vibration damper. The figure which shows the structure of the dynamic vibration damping device of the rotary machine which concerns on 2nd Embodiment. The figure which shows the structure of the dynamic vibration damping device of the rotary machine which concerns on 2nd Embodiment. The figure which shows the structure of the dynamic vibration damper of the rotary machine which concerns on 3rd Embodiment. The figure which shows the structure of the dynamic vibration damper of the rotary machine which concerns on 4th Embodiment. The figure which shows the structure of the dynamic vibration damper of the rotary machine which concerns on 5th Embodiment. The figure which shows the structure of the dynamic vibration damper of the rotary machine which concerns on 6th Embodiment. The figure which shows the structure of the dynamic vibration damper of the rotary machine which concerns on 6th Embodiment. The figure which shows the effect | action of the dynamic vibration damper of the rotary machine which concerns on 7th Embodiment. The figure which shows the structure of the dynamic vibration damper of the rotary machine which concerns on 8th Embodiment. The figure which shows the structure of the dynamic vibration damper of the rotary machine which concerns on 9th Embodiment. The figure which shows the structure of the dynamic vibration damper of the rotary machine which concerns on 10th Embodiment. The figure which shows the structure of the dynamic vibration damper of the rotary machine which concerns on 11th Embodiment. The figure which shows the Example which applied the conventional dynamic vibration damper to the rotary machine.

Explanation of symbols

1 Weight 2 Elastic member 3 Rotating machine (electric motor)
39 Center of gravity 4 Foundation 5 Mounting platform 51 Support point (mounting frame flange)
6 Vertical shaft pump 11 Plate weight (weight plate)
21 Pipe 22 Long installation bolt

Claims (12)

  The center of gravity position of the rotating machine is set with respect to the foundation structure and the mounting base of the rotating machine, which are provided on the upper end side of the foundation structure and serve as a fulcrum for the horizontal vibration motion of the rotating machine having a rotating shaft in the vertical direction. A rotating machine comprising: an elastic member attached to the tip side of the rotating machine that is opposite to the rotating machine; and a weight provided on the tip side of the rotating machine via the elastic member. Dynamic vibration absorber.   The elastic member is a hollow pipe-shaped hollow elastic member, and the weight includes a mounting base having a hole for fixing to a tip of the rotating machine, and the weight includes the hollow pipe and the hole of the mounting base. The dynamic vibration damping device for a rotary machine according to claim 1, wherein the dynamic vibration absorber is attached to a front end surface of the rotary machine by a through bolt that passes through the rotary machine.   The dynamic vibration damping device for a rotary machine according to claim 2, wherein the hollow elastic member is divided into a plurality of pieces in a direction crossing the central axis.   The elastic member includes a stud bolt for attaching the elastic member to the rotating machine, and the stud bolt is fixed by adjusting a position of the weight and screwing a tip portion of the stud bolt and a nut. The dynamic vibration damping device for a rotary machine according to claim 1, wherein the dynamic vibration damping device is provided.   The rotary member according to any one of claims 1 to 4, wherein the elastic member is set to have a cross-sectional shape having different cross-sectional secondary moments in two orthogonal directions in the cross-section. Dynamic vibration absorber.   6. The dynamic vibration absorber for a rotary machine according to claim 1, wherein the weight has an opening for ventilation.   The dynamic vibration damping device for a rotary machine according to claim 6, wherein a fan cover is attached to the weight, and a protective cover is attached to the opening of the weight.   8. The dynamic vibration damping device for a rotary machine according to claim 1, wherein the weight is configured by stacking a plurality of plate weights.   9. The dynamic vibration damping device for a rotary machine according to claim 8, wherein a vibration isolating rubber is inserted between the pedestals holding the plurality of plate weights.   The plurality of plate weights are stacked to form a weight, and vibration isolating rubber is interposed between upper and lower plate weights of the plurality of plate weights. A dynamic vibration damping device for a rotary machine according to any one of claims 8 and 9.   When the weight is configured by stacking the plurality of plate weights, a bolt hole that penetrates the plate weight and a pedestal that holds the plate weight is provided and penetrates the bolt hole. The dynamic vibration damping device for a rotary machine according to any one of claims 8 to 10, wherein the plate-like weight and the pedestal are coupled by fastening with a mounting bolt.   The rotary machine having a rotary shaft includes a vertical pump, and an electric motor that is installed at an upper end of the vertical pump and drives the vertical pump. A dynamic vibration damping device for a rotating machine as described.

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