JP2017160871A - Structure for supporting rotary machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for supporting a rotary machine that has high strength with respect to a load in an axial direction and a load in a direction perpendicular to the axial direction.SOLUTION: The structure for supporting a rotary machine, such as a horizontal shaft-type liquid pump, includes: a pair of support pedestals 21, 23 facing each other and supporting the rotary machine 100; and a pair of rectangular reinforcement members 29a, 30a respectively connected to axial end surfaces 21a, 23a of the pair of support pedestals 21, 23.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a support structure of a horizontal shaft type rotary machine for transferring liquid or gas.

  In boiler water supply systems, petroleum / chemical plant factories, steel mills, and the like, there are processes that require high pressure water of several MPa to 20 MPa. Therefore, a horizontal axis multistage centrifugal pump is used to supply such high-pressure water.

  FIG. 16 is a cross-sectional view showing an example of a horizontal-axis multistage centrifugal pump. A multistage pump 100 as a rotating machine shown in FIG. 16 has a plurality of impellers 2 and a rotating shaft 1 to which these impellers 2 are fixed. The rotating shaft 1 extends horizontally and is supported by a thrust bearing 9A and a radial bearing 9B. The plurality of impellers 2 are arranged in series on the rotating shaft 1, and a plurality of guide vanes 6 are arranged so as to surround each of the impellers 2. One end of the rotary shaft 1 is connected to a drive machine such as an electric motor (not shown), and the rotary shaft 1 and the impeller 2 are rotated by this drive machine.

  The impeller 2 and the guide vane 6 are disposed in the pump casing 5. When the plurality of impellers 2 rotate with the rotation of the rotating shaft 1, liquid such as water is sucked from the suction port 3, and the pressure of the liquid is increased by the action of the impeller 2 and the guide vane 6, and the liquid is discharged from the discharge port. 4 is spit out. The liquid pressurized by one impeller 2 is further pressurized by the next impeller 2, and such pressurization by the impeller 2 is repeated by the number of impellers 2 provided.

  Since the plurality of impellers 2 are arranged in the same direction, the thrust force generated by the pressure difference between the adjacent impellers 2 is overlapped by the number of impellers 2, and a large thrust force is generated. This thrust force is offset by the balance device 7 provided in the multistage pump 100, but a certain amount of thrust force still remains during operation. This residual thrust force is supported by a thrust bearing 9 </ b> A, and the stator side itself of the thrust bearing 9 </ b> A is supported by the pump casing 5. The pump casing 5 is fixed to a pedestal (not shown), and this pedestal is supported by a frame and a foundation. Therefore, the residual thrust force is finally supported by these pedestals, mounts and foundations.

  The liquid such as water pressurized by the plurality of impellers 2 is finally discharged from the discharge port 4 of the multistage pump 100. At this time, the reaction force is applied to the pump casing 5 in the direction opposite to the direction in which the liquid is discharged. The direction of the discharge port 4 is not necessarily a fixed direction due to the installation space, and can take various directions such as upward, downward, rightward, and leftward. Therefore, a biased force is also applied to the pedestal that supports the pump casing 5 and the pedestal that supports the pedestal.

  In addition, before and after the liquid passes through the impeller 2 and the guide vane 6, the pressure of the liquid is not necessarily in a smooth continuous state. For this reason, the vibration and force by the influence are applied to various directions of the radial direction of the pump casing 5. Accordingly, the pedestal that supports the pump casing 5 and the pedestal that supports the pedestal are also subjected to force due to the influence thereof. For this reason, about the base and stand which support the multistage pump 100, appropriate rigidity is required.

  Patent Document 1 discloses a conventional support base reinforcement structure. FIG. 17A is a schematic view of a conventional support base viewed from the axial direction, FIG. 17B is a view viewed from a direction perpendicular to the axial direction, and FIG. 17C is a plan view. It is. The support bases 121 and 123 described in these drawings are for supporting the horizontal shaft pump 100. The support bases 121 and 123 are fixed to the mount 126.

  Reinforcing members 122a and 122b extending in the axial direction (direction in which the rotating shaft 1 extends) are fixed to the support base 121, and reinforcing members 124a and 124b extending in the axial direction are also fixed to the support base 123. The rigidity of the support bases 121 and 123 is reinforced by these reinforcing members 122a, 122b, 124a, and 124b. Furthermore, if necessary, reinforcing members 122c and 124c extending in a direction perpendicular to the axial direction are fixed to the support bases 121 and 123 to further strengthen the rigidity.

  In addition to the problems pointed out in Patent Document 1, the conventional reinforcing structure of the support base has the following problems. That is, the reinforcing members 122a, 122b, 124a, and 124b extending in the axial direction are substantially right triangular plate members. Of the two sides sandwiching the right angle, one side of each reinforcing member is connected to the upper surface of the gantry 126, and the other side is connected to the vertical surface of each support base. However, since the reinforcing members 122a, 122b, 124a, and 124b are plate-shaped, they are easily bent when a load in the axial direction (the direction indicated by the arrow A) is applied, as shown in FIG. Further, as shown in FIG. 18B, the reinforcing members 122c and 124c extending in the direction perpendicular to the axial direction are the same when a load is applied in the direction perpendicular to the axial direction (direction indicated by arrow B). Easy to bend. Furthermore, since the reinforcing members 122c and 124c are inside the support bases 121 and 123, they do not contribute much to the rigidity of the support bases 121 and 123 when a force in a direction perpendicular to the axial direction is applied.

JP 2014-114822 A

  Therefore, an object of the present invention is to provide a rotating machine support structure having high rigidity with respect to an axial load or a load perpendicular to the axial direction.

In order to achieve the above-described object, according to one aspect of the present invention, in a support structure for a rotary machine, a pair of support bases facing each other for supporting the rotary machine, and an axial end surface of the pair of support bases are provided. A pair of rectangular reinforcing members connected to each other are provided.
In a preferred aspect of the present invention, the length of the reinforcing member along the axial direction of the rotating machine is ¼ to ½ of the length along the axial direction of the support base. It is characterized by.
In a preferred aspect of the present invention, the pair of reinforcing members are a pair of first reinforcing members, and a pair of rectangular second reinforcing members are connected to the pair of first reinforcing members, respectively. The second reinforcing member extends from the first reinforcing member in a direction perpendicular to the axial direction of the rotating machine.
In a preferred aspect of the present invention, the distance in the direction perpendicular to the axial direction from the inner surface of the support pedestal to the outermost surface of the second reinforcing member is 1.2 times the width of the support pedestal. It is characterized by 2.0 times.

One aspect of the present invention includes a rotating machine support structure including a pair of support pedestals facing each other and a pair of rectangular reinforcing members connected to the pair of support pedestals for supporting the rotating machine. The reinforcing member protrudes from the support base in a direction perpendicular to the axial direction of the rotating machine.
In a preferred aspect of the present invention, the reinforcing member is connected to an outer surface or an axial end surface of the support base.
In a preferred aspect of the present invention, the length of the reinforcing member along the axial direction of the rotary machine is 1/100 to 1/10 of the length along the axial direction of the support base. It is characterized by.
In a preferred aspect of the present invention, the distance in the direction perpendicular to the axial direction from the inner side surface of the support pedestal to the outermost surface of the reinforcing member is from 1.2 times the width of the support pedestal to 2.0. It is characterized by being double.
In a preferred aspect of the present invention, the pair of reinforcing members are a pair of first reinforcing members, and a pair of rectangular second reinforcing members are connected to the pair of first reinforcing members, respectively. The second reinforcing member extends in the axial direction from the first reinforcing member.

  Depending on the mounting and operating conditions of a rotary machine such as a liquid pump, even if an axial load or a load in a direction perpendicular to the axial direction is applied to the support base of the rotary machine, such a load can be properly supported. A highly rigid support structure that can be provided can be provided.

It is a side view which shows one Embodiment of the support structure of a rotary machine. It is a top view of embodiment shown in FIG. It is the figure which looked at embodiment shown in FIG. 1 from the axial direction. It is a side view which shows other embodiment of the support structure of a rotary machine. It is a top view of embodiment shown in FIG. It is the figure which looked at embodiment shown in FIG. 4 from the axial direction. It is a side view which shows other embodiment of the support structure of a rotary machine. It is a top view of embodiment shown in FIG. It is the figure which looked at embodiment shown in FIG. 7 from the axial direction. It is a side view which shows other embodiment of the support structure of a rotary machine. It is a top view of embodiment shown in FIG. It is the figure which looked at embodiment shown in FIG. 10 from the axial direction. It is a side view which shows other embodiment of the support structure of a rotary machine. It is a top view of embodiment shown in FIG. It is the figure which looked at embodiment shown in FIG. 13 from the axial direction. It is sectional drawing which shows the horizontal axis multistage centrifugal pump which is an example of a rotary machine. FIG. 17A is a schematic view of a conventional support base viewed from the axial direction, FIG. 17B is a view viewed from a direction perpendicular to the axial direction, and FIG. 17C is a plan view. It is. FIG. 18A and FIG. 18B are diagrams illustrating how the reinforcing member is deformed by receiving a load.

  Embodiments of the present invention will be described below with reference to the drawings. The embodiment described below is an example in which the present invention is applied to a horizontal shaft type liquid pump that is an example of a rotating machine. However, the present invention is not limited to this embodiment, and a gas such as a fan, a compressor, or a turbine may be used. Alternatively, it can be applied to other rotating machines for transferring a fluid such as a liquid.

  1 to 3, the multistage pump 100 is supported and fixed by a pair of support bases 21 and 23 facing each other. These support bases 21 and 23 are fixed to the gantry (or foundation) 26 by welding or fastening members such as bolts. The driving machine 10 is fixed to a support base 28 fixed to a gantry (or foundation) 27. In the present embodiment, the gantry 26 for the multistage pump 100 and the gantry 27 for the driving machine 10 are separated from each other, but the present invention is not limited to this embodiment. For example, the gantry 26 and the gantry 27 may be an integral structure. That is, the support bases 21 and 23 that support the multistage pump 100 and the support base 28 that supports the driving machine 10 may be fixed to a common base. The rotary shaft 1 of the multistage pump 100 and the drive shaft 11 of the drive machine 10 are connected via a coupling 12. Since the structure of the multistage pump 100 is the same as the structure shown in FIG. 16, the same components are denoted by the same reference numerals, and redundant description thereof is omitted.

  The support bases 21 and 23 are made of iron or concrete. The support bases 21 and 23 have a symmetrical shape. The length L of the support bases 21 and 23 along the axial direction of the multistage pump 100 (that is, the direction in which the rotary shaft 1 extends) is equal to or greater than the distance between the suction port 3 and the discharge port 4. As shown in FIG. 2, the width W of the support bases 21 and 23 is 10% or more of the length L. The width W is the average width of each support pedestal. As shown in FIG. 3, the height H of the support bases 21 and 23 is such a height that the lowermost surface of the pump casing 5 is separated from the upper surface of the gantry (or foundation) 26. The inside of the support bases 21 and 23 may be hollow. In this case, the surfaces of the support bases 21 and 23 are formed of a plate material, and the thickness of the plate material is 1% or more of the length L.

  As described in the background art, the plurality of impellers 2 are arranged in the pump casing 5 (see FIG. 16). When the plurality of impellers 2 rotate with the rotation of the rotating shaft 1, the liquid such as water pressurized by one impeller 2 is further pressurized by the next impeller 2, The pressure is repeated and finally reaches the maximum pressure at the discharge port 4.

  Since the plurality of impellers 2 are arranged in the same direction, the thrust force is overlapped by the number of impellers 2 due to the pressure difference between the adjacent impellers 2, and a large thrust force is generated. This thrust force is offset by the balance device 7 (see FIG. 16) provided in the multistage pump 100, but a certain amount of thrust force still remains during operation. This residual thrust force is supported by a thrust bearing 9A (see FIG. 16). The stator side of the thrust bearing 9 </ b> A is fixed to the pump casing 5. The pump casing 5 is supported by support bases 21 and 23, and the support bases 21 and 23 are fixed to the upper surface of the mount 26.

  The thrust force fluctuates depending on the pressure fluctuation of the liquid such as water supplied to the pump 100 and the pressure fluctuation generated by using the liquid discharged from the pump 100. In order to reinforce the rigidity of the support bases 21 and 23 that support this thrust force, the support structure of this embodiment includes rectangular reinforcing members 29a and 30a. The reinforcing members 29a and 30a have a rectangular shape when viewed from a direction perpendicular to the axial direction. The reinforcing members 29a and 30a have a symmetrical shape. The reinforcing members 29a and 30a are made of iron or concrete. The reinforcing members 29a and 30a are fixed to the support bases 21 and 23 and the mount 26 with a fastening member such as a weld or a bolt.

  The length Ls along the axial direction of the multistage pump 100 of the reinforcing members 29a and 30a is not less than one quarter and not more than one half of the length L of the support bases 21 and 23 (that is, , Ls = L / 4 to L / 2). Further, the height Hs of the reinforcing members 29a and 30a is not less than one half of the height H of the support bases 21 and 23 and not more than the height H (that is, Hs = H / 2 to H). . Further, the width Ws of the reinforcing members 29a and 30a is not less than 1/20 of the width W of the support bases 21 and 23 and is not more than the width W (that is, Ws = W / 20 to W). The width Ws of the reinforcing members 29a and 30a refers to the width of the reinforcing members 29a and 30a in the direction perpendicular to the axial direction. The insides of the reinforcing members 29a and 30a may be hollow. In this case, the surface of the reinforcing members 29a and 30a is formed of a plate material, but the thickness of the plate material is still 1% or more of the length L.

  The reinforcing members 29a, 30a are connected to the axial end faces 21a, 23a, 21b, 23b of the support bases 21, 23 (that is, the end faces in the axial direction of the multistage pump 100). By doing so, the reinforcing members 29a and 30a have a sufficient width Ws (Ws = W / 20 to W), so that the supporting bases 21 and 23 are reinforced without bending when receiving a load. Can do. If the purpose is only to support the thrust force, the reinforcing members 29a and 30a are provided at the axial end surfaces 21a and 23a on the discharge port side of the support bases 21 and 23, or the axial end surfaces 21b and 23b on the suction port side. You may connect only to either. When more reliable reinforcement is required, as shown in FIGS. 1 and 2, reinforcing members 29a and 30a are provided on both the axial end surfaces 21a and 23a on the discharge port side and the axial end surfaces 21b and 23b on the suction port side. May be connected.

  By the way, the liquid such as water pressurized by the plurality of impellers 2 is finally discharged from the discharge port 4 of the multistage pump 100. At this time, the reaction force is applied to the pump casing 5 in the direction opposite to the direction in which the liquid is discharged. The direction of the discharge port 4 is not necessarily a fixed direction due to the installation space, and can take various directions such as upward, downward, rightward, and leftward. Therefore, force is applied to the support bases 21 and 23 that support the pump casing 5 and the frame 26 that supports the support bases 21 and 23 in a direction perpendicular to the axial direction. 4 to 6 show examples in which reinforcing members 29b and 30b are provided in place of the reinforcing members 29a and 30a in order to reinforce the rigidity of the support bases 21 and 23 according to such force.

  The reinforcing members 29b and 30b have a rectangular shape when viewed from a direction perpendicular to the axial direction. The reinforcing members 29b and 30b have a symmetrical shape. The reinforcing members 29b and 30b are connected to the outer surfaces 21c and 23c of the support bases 21 and 23, respectively. The outer side surfaces 21c and 23c are surfaces opposite to the inner side surfaces 21d and 23d facing the pump casing 5 of the multistage pump 100. The reinforcing members 29b and 30b protrude outward from the support bases 21 and 23 in a direction perpendicular to the axial direction.

  The positions where the reinforcing members 29b and 30b are connected to the support bases 21 and 23 are not particularly limited. In the present embodiment, the reinforcing members 29b and 30b are connected to the outer surfaces 21c and 23c of the support bases 21 and 23 at positions close to the axial end surfaces 21a and 23a on the discharge port side. This is because the corners formed by connecting the axial end faces 21a, 23a and the outer faces 21c, 23c are not easily deformed. By connecting the reinforcing members 29b and 30b at this position, the deformation of the support bases 21 and 23 can be further reduced. For the same reason, the reinforcing members 29b and 30b may be connected to the outer surfaces 21c and 23c of the support bases 21 and 23 at positions close to the axial end surfaces 21b and 23b on the suction port side. In one embodiment, the reinforcing members 29b and 30b may be connected to the central portions of the outer surfaces 21c and 23c of the support bases 21 and 23.

  The reinforcing members 29b and 30b are made of iron or concrete. As shown in FIG. 6, the reinforcing members 29 b and 30 b are connected to the outer surfaces 21 c and 23 c of the support bases 21 and 23 and further connected to the upper surface of the gantry 26. The reinforcing members 29b and 30b are fixed to the support bases 21 and 23 and the mount 26 with a fastening member such as a weld or a bolt.

  As shown in FIG. 4, the length Lt of the reinforcing members 29b and 30b along the axial direction of the multi-stage pump 100 is 1/100 or more of the length L of the support bases 21 and 23, and 10 minutes. Or less (ie, Lt = L / 100 to L / 10). As shown in FIG. 6, the height Ht of the reinforcing members 29b and 30b is not less than one half of the height H of the support bases 21 and 23 and is not more than the height H of the support bases 21 and 23 ( That is, Ht = H / 2 to H).

  The distance in the direction perpendicular to the axial direction from the inner side surface 21d (23d) of the support base 21 (23) to the outermost surface of the reinforcing member 29b (30b), that is, the width W of the support base 21 (23) The total width of the reinforcing member 29b (30b) is 1.2W to 2.0W. The insides of the reinforcing members 29b and 30b may be hollow. In this case, the reinforcing members 29b and 30b have a structure in which the surfaces of the reinforcing members 29b and 30b are formed of a plate material. The thickness of the plate material is still 1% or more of the length L.

  Thus, since the reinforcing members 29b and 30b extend in the direction away from the pump 100, the support bases 21 and 23 can be reinforced in the direction perpendicular to the axial direction. Furthermore, since the length Lt of the reinforcing members 29b and 30b along the axial direction of the multi-stage pump 100 is L / 100 to L / 10, the reinforcing members 29b and 30b when the load is applied in the direction perpendicular to the axial direction. 30b never bends.

  In one embodiment, as shown in FIGS. 7 to 9, the reinforcing members 29 b and 30 b may be connected to the axial end surfaces 21 a and 23 a on the discharge port side of the support bases 21 and 23. Also in this embodiment, the reinforcing members 29b and 30b protrude from the support bases 21 and 23 in a direction perpendicular to the axial direction.

  In the actual pump, both the thrust force and the reaction force received from the liquid discharged from the discharge port 4 are simultaneously applied to the pump casing 5. The reinforcing members 29a and 30a according to the embodiment shown in FIGS. 1 to 3 described above are mainly suitable for supporting a thrust force, and the reinforcing members 29b and 30b according to the embodiment shown in FIGS. 4 to 9 described above. Is mainly suitable for supporting the reaction force. However, in many cases, both thrust force and reaction force cannot be ignored.

  FIGS. 10 to 12 are views showing an embodiment in which both thrust force and reaction force received from the liquid discharged from the discharge port 4 can be supported at the same time. In this embodiment, in order to support the thrust force, the reinforcing members 29a and 30a described in FIGS. 1 to 3 are connected to the axial end surfaces 21a and 23a on the discharge port side of the support bases 21 and 23. Furthermore, in order to support the reaction force received from the liquid, the reinforcing members 29b and 30b described in FIGS. 4 to 6 are connected to the axial end surfaces of the reinforcing members 29a and 30a.

  The reinforcing members 29a and 30a and the reinforcing members 29b and 30b are arranged in the axial direction and are fixed to each other by a fastening member such as welding or a bolt. The reinforcing members 29b and 30b are disposed away from the support bases 21 and 23 in the axial direction. One axial end surface of the reinforcing members 29a, 30a is connected to the axial end surfaces 21a, 23a on the discharge port side of the support bases 21, 23, and the axial end surface on the opposite side of the reinforcing members 29a, 30a is connected to the reinforcing member 29b. , 30b. The reinforcing members 29b and 30b extend outward from the reinforcing members 29a and 30a in a direction perpendicular to the axial direction. The outer end surfaces of the reinforcing members 29b and 30b are located outside the support bases 21 and 23.

  The length, height, and width of the reinforcing members 29a, 30a are the same as the length Ls, the height Hs, and the width Ws in the embodiment shown in FIGS. Similarly, the lengths and heights of the reinforcing members 29b and 30b are the same as the Lt and the height Ht in the embodiment shown in FIGS. 4 to 6 described above. The distance from the inner surface 21d (23d) of the support base 21 (23) to the outermost surface of the reinforcing member 29b (30b), that is, the width W of the support base 21 (23) and the width of the reinforcing member 29b (30b) The total is from 1.2W to 2.0W.

  In the present embodiment, the reinforcing members 29a and 30a constitute a first reinforcing member, and the reinforcing members 29b and 30b constitute a second reinforcing member. The first reinforcing member and the second reinforcing member are connected vertically to each other. The combination of the two types of reinforcing members can improve the rigidity of the support bases 21 and 23 that simultaneously receive the thrust force and the reaction force from the liquid. Further, in Patent Document 1, since the reinforcing member is thin, it was easy to bend in the thickness direction. However, the reinforcing member of the present invention has a large width in a direction in which the reinforcing member may be bent, and is subjected to a load. The structure is difficult to bend. Furthermore, since the first reinforcing member and the second reinforcing member are combined so that the thickness directions thereof are different from each other, a structure that is difficult to bend not only in the axial direction but also in a direction perpendicular to the axial direction can be realized.

  FIGS. 13 to 15 are diagrams showing another embodiment that can simultaneously support the thrust force and the reaction force received from the liquid discharged from the discharge port 4. The configuration of the present embodiment that is not specifically described is the same as that of the embodiment shown in FIGS.

  In the present embodiment, the reinforcing members 29b and 30b described with reference to FIGS. 4 to 6 are connected to the outer surfaces 21c and 23c of the support bases 21 and 23 in order to support the reaction force received from the liquid. Further, in order to support the thrust force, the reinforcing members 29a and 30a described in FIGS. 1 to 3 are connected to the outermost end surfaces of the reinforcing members 29b and 30b. The reinforcing members 29b and 30b and the reinforcing members 29a and 30a are arranged in a direction perpendicular to the axial direction, and are fixed to each other by a fastening member such as welding or a bolt.

  The reinforcing members 29a and 30a are disposed away from the support bases 21 and 23 in a direction perpendicular to the axial direction. The inner end faces of the reinforcing members 29b, 30b are connected to the outer faces 21c, 23c of the support bases 21, 23, and the outer end faces of the reinforcing members 29b, 30b are connected to the side faces of the reinforcing members 29a, 30a. The reinforcing members 29a and 30a extend in the axial direction from the reinforcing members 29b and 30b. The entirety of the reinforcing members 29a and 30a is located outside the support bases 21 and 23.

  In the present embodiment, the reinforcing members 29b and 30b constitute a first reinforcing member, and the reinforcing members 29a and 30a constitute a second reinforcing member. The first reinforcing member and the second reinforcing member are connected vertically to each other. The combination of the two types of reinforcing members can improve the rigidity of the support bases 21 and 23 that simultaneously receive the thrust force and the reaction force from the liquid.

  The length, height, and width of the reinforcing members 29a, 30a are the same as the length Ls, the height Hs, and the width Ws in the embodiment shown in FIGS. Similarly, the lengths and heights of the reinforcing members 29b and 30b are the same as the Lt and the height Ht in the embodiment shown in FIGS. 4 to 6 described above. The distance from the inner surface 21d (23d) of the support base 21 (23) to the outermost surface of the reinforcing member 29b (30b), that is, the width W of the support base 21 (23) and the width of the reinforcing member 29b (30b) The total is from 1.2W to 2.0W.

  The embodiment shown in FIGS. 10 to 12 and the embodiment shown in FIGS. 13 to 15 can reinforce the rigidity of the support bases 21 and 23 that support the radial load and the thrust load, and the liquid is impeller. 2 and the rigidity of the support bases 21 and 23 that support forces in various directions applied to the pump casing 5 due to discontinuous pressure fluctuations when passing through the guide vanes 6 can be enhanced.

  In the embodiment shown in FIGS. 10 to 12 and the embodiment shown in FIGS. 13 to 15, the reinforcing members 29a and 30a and the reinforcing members 29b and 30b are made of iron or concrete. The reinforcing member 29a (30a) and the reinforcing member 29b (30b) may be separate parts or may be an integral structure. Further, the insides of the reinforcing members 29a and 30a and the reinforcing members 29b and 30b may be hollow. In this case, the surfaces of the reinforcing members 29a and 30a and the reinforcing members 29b and 30b are formed of a plate material. The thickness of the plate material is still 1% or more of the length L.

  As described above, the gist of the present invention is not limited to the embodiments, but is based on the technical scope of the claims.

DESCRIPTION OF SYMBOLS 1 Rotating shaft 2 Impeller 3 Suction port 4 Discharge port 5 Pump casing 6 Guide vane 9A Thrust bearing 9B Radial bearing 10 Driver 11 Drive shaft 12 Couplings 21, 23 Support base 26 Base 27 Base 28 Support base 29a, 30a, 29b 30b Reinforcement member 100 Multistage pump

Claims (9)

In the support structure of a rotating machine,
A pair of support bases facing each other for supporting the rotating machine;
A support structure for a rotary machine comprising a pair of rectangular reinforcing members respectively connected to axial end surfaces of the pair of support bases.   The length of the reinforcing member along the axial direction of the rotating machine is ¼ to ½ of the length along the axial direction of the support pedestal. 2. A support structure for a rotating machine according to 1. The pair of reinforcing members is a pair of first reinforcing members,
A pair of rectangular second reinforcing members are connected to the pair of first reinforcing members, respectively.
The rotating machine support structure according to claim 1 or 2, wherein the second reinforcing member extends from the first reinforcing member in a direction perpendicular to an axial direction of the rotating machine.   The distance in the direction perpendicular to the axial direction from the inner surface of the support pedestal to the outermost surface of the second reinforcing member is 1.2 to 2.0 times the width of the support pedestal. The support structure for a rotary machine according to claim 3. In the support structure of a rotating machine,
A pair of support bases facing each other for supporting the rotating machine;
A pair of rectangular reinforcing members respectively connected to the pair of support bases;
The support structure for a rotary machine, wherein the reinforcing member protrudes from the support base in a direction perpendicular to an axial direction of the rotary machine.   6. The rotating machine support structure according to claim 5, wherein the reinforcing member is connected to an outer surface or an axial end surface of the support base.   The length of the reinforcing member along the axial direction of the rotating machine is 1/100 to 1/10 of the length of the support base along the axial direction. Or the support structure of the rotary machine of 6.   The distance in the direction perpendicular to the axial direction from the inner surface of the support pedestal to the outermost surface of the reinforcing member is 1.2 to 2.0 times the width of the support pedestal. The support structure for a rotary machine according to any one of claims 5 to 7. The pair of reinforcing members is a pair of first reinforcing members,
A pair of rectangular second reinforcing members are connected to the pair of first reinforcing members, respectively.
The rotating machine support structure according to any one of claims 5 to 8, wherein the second reinforcing member extends in the axial direction from the first reinforcing member.

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