JP2020125734A - Design method for impeller, manufacturing method for impeller, design system for impeller, and manufacturing system for impeller - Google Patents

Abstract

To restrain a formation failure even if a plane of a formed layer becomes large when it is formed by lamination molding.SOLUTION: A design method for an impeller of a pump comprises a design change step of changing design of the impeller so as to perform lamination molding of the impeller on the basis of information of the impeller while the impeller comprises a plurality of main blades for giving energy to pumped liquid.SELECTED DRAWING: Figure 10

Description

The present invention relates to an impeller design method, an impeller manufacturing method, an impeller design system, and an impeller manufacturing system.

Conventionally, various impellers are used according to the pump. There are closed impeller, open impeller, non-clog type impeller and so on. The closed impeller is an impeller having a side plate in a centrifugal pump and a mixed flow pump. The open impeller is a centrifugal pump and a mixed flow pump and has no side plate. Of these, the one with the main plate extending to the outer circumference of the blade is called a semi-open type impeller, and the one with the main plate as short as possible is the full-open type impeller.

Further, different types of impellers are used depending on the suction type. In the case of a single suction pump, a single suction impeller is used, and in the case of a double suction pump, a double suction impeller is used. The impeller for both suction sucks fluid from both the left and right sides of the impeller evenly and accelerates. For example, a double suction impeller is used in a horizontal shaft double suction centrifugal pump.

As a technique applied to the 3D printer, a technique called a layered manufacturing method using a laser or the like is known. For example, this technique obtains a three-dimensional shape by sintering or melting metal powder on a substantially two-dimensional plane by a laser or the like and stacking these. Patent Document 1 describes a method of forming an impeller applied to a turbine wheel by an additive manufacturing method.

JP, 2016-037901, A

In the case of the layered manufacturing, the smaller the flat surface of the layer to be formed, the easier the molding, and the larger the flat surface, the more easily defective formation such as deformation occurs. In the impeller having the main plate and/or the side plate, when the number of the main blades is small, the flat surface portion of the main plate and/or the side plate becomes large, and it is difficult to form by the additive manufacturing. In addition, in particular, it is difficult to correct the shape of the flow path sandwiched between the main plate and the side plate due to the post-processing, so it is desirable to avoid defective molding.

The present invention has been made in view of the above problems, and in the case of forming an impeller by additive manufacturing, a method for designing an impeller, a method for manufacturing an impeller, and an impeller that enable formation defects to be suppressed. It is an object of the present invention to provide a design system and an impeller manufacturing system.

A design method for an impeller according to a first aspect of the present invention is a design method for a pump impeller, wherein the impeller includes a plurality of main blades that give energy to pumping liquid, and information on the impeller is provided. On the basis of the above, there is a design change process for changing the design of the impeller that laminate-molds the impeller.

According to this configuration, in the case where the impeller is formed by additive manufacturing, the design can be changed so that the impeller is additive manufactured. Therefore, deformation of the impeller during additive manufacturing can be suppressed, and thus formation defects can be suppressed. can do.

An impeller designing method according to a second aspect of the present invention is the impeller designing method according to the first aspect, wherein in the design changing step, an intermediate blade required to laminate-mold the impeller. Change the design of the impeller to add.

According to this configuration, in the case of forming by additive manufacturing, it is possible to design the intermediate blade to be provided between the adjacent main blades even if the plane of the formed layer becomes large. Therefore, the deformation of the impeller during the additive manufacturing can be suppressed, and thus the formation failure can be suppressed.

An impeller designing method according to a third aspect of the present invention is the impeller designing method according to the first aspect, wherein the impeller information is adjacent to the impeller material information. Including the distance between the adjacent main wings in the laminated surface on which the main wings are formed, in the design changing step, the design of the impeller is changed to add the intermediate blade between the adjacent main wings. ..

According to this configuration, the distance between the main blade and the intermediate blade can be set according to the distance between the adjacent main blades on the laminated surface on which the adjacent main blades are formed and the material of the impeller. The deformation of the impeller during modeling can be suppressed.

An impeller design method according to a fourth aspect of the present invention is the impeller design method according to the third aspect, wherein in the design changing step, a predetermined allowable distance that differs depending on a material of the impeller is used. The design of the impeller is changed so that the intermediate blade is added so that the distance between the plurality of main blades on the stacking surface becomes short.

With this configuration, the distance between the main blade and the intermediate blade can be made shorter than a predetermined allowable distance according to the material of the impeller, so that the deformation of the impeller during additive manufacturing can be suppressed. ..

An impeller design method according to a fifth aspect of the present invention is the impeller design method according to any one of the first to fourth aspects, wherein the impeller is a closed impeller, and The laminated surface is a main plate or a side plate of the impeller formed after the main blade.

With this configuration, on the surface of the main plate or the side plate formed on the impeller, the distance between the main blade and the intermediate blade can be made shorter than a predetermined allowable distance according to the material of the impeller. It is possible to suppress the deformation of the impeller during the additive manufacturing.

An impeller design method according to a sixth aspect of the present invention is the impeller design method according to any one of the first to fifth aspects, wherein the intermediate blade is provided after the design change step. The method further comprises the step of performing fluid analysis on the pump provided with an impeller.

According to this configuration, it is possible to confirm whether or not the impeller provided with the intermediate blade meets the customer's request by performing a fluid analysis on the impeller provided with the intermediate blade due to the design change.

A method for manufacturing an impeller according to a seventh aspect of the present invention is the method for manufacturing an impeller according to the eighth aspect, including an operating point in which a selection range based on the result of the fluid analysis satisfies the customer requirement. If so, the method includes controlling the additive manufacturing machine so that additive manufacturing is performed.

According to this configuration, when the impeller provided with the intermediate blade meets the customer's request due to the design change, the impeller can be manufactured with the design.

An impeller design method according to an eighth aspect of the present invention is the impeller design method according to the sixth or seventh aspect, wherein an operating point in which a selection range based on the result of the fluid analysis satisfies the customer requirement. When not including, the method further includes a step of changing at least one of the information on the material of the impeller and the design shape of the impeller, and performing the fluid analysis again after the change.

According to this configuration, it is possible to confirm whether or not the changed impeller satisfies the customer's request by performing a fluid analysis on the changed impeller.

An impeller designing method according to a ninth aspect of the present invention is the impeller designing method according to any one of the sixth to eighth aspects, in which a pump model is selected from a plurality of pump model groups according to a customer request. And a step of re-selecting the selected pump model when the selection range based on the result of the fluid analysis does not include an operating point that satisfies the customer's request.

According to this configuration, it is possible to satisfy the customer's request by reselecting the pump model.

An impeller design method according to a tenth aspect of the present invention is the impeller design method according to any one of the first to ninth aspects, wherein in the design changing step, an outer diameter of the impeller is changed. , And/or the wing angle of the main wing and/or the intermediate wing is redesigned.

The method for manufacturing an impeller according to an eleventh aspect of the present invention is a method for manufacturing an impeller, the impeller designed by the method for designing an impeller according to any one of the first to tenth aspects being formed by additive manufacturing. It is a manufacturing method.

According to this configuration, in the case of forming by additive manufacturing, even if the plane of the layer to be formed becomes large, the intermediate blade can be designed to be provided between the adjacent main blades. Since deformation during the additive manufacturing can be suppressed, formation defects can be suppressed.

An impeller design system according to a twelfth aspect of the present invention is an impeller design system for a pump, the impeller having a plurality of main blades for imparting energy to the pumping liquid, comprising: On the basis of the above, the design changing unit is provided for changing the design of the impeller so that the impeller is laminated and manufactured.

According to this configuration, in the case where the impeller is formed by additive manufacturing, the impeller can be designed so as to be additive manufactured. Therefore, deformation of the impeller during additive manufacturing can be suppressed, and thus formation defects can be suppressed. You can

An impeller design system according to a thirteenth aspect of the present invention is the impeller design system according to the twelfth aspect, wherein the design change section adds an intermediate blade necessary for additive manufacturing. Change the design of the impeller.

An impeller manufacturing system according to a fourteenth aspect of the present invention is an impeller of a pump, which is provided with a plurality of main blades that give energy to the pumping liquid, and is provided in the information of the impeller. Based on the design change unit, the design change unit changes the design of the impeller so that the impeller is additively manufactured, and the additive manufacturing machine that additively modifies the impeller after the design change.

According to this configuration, in the case where the impeller is formed by additive manufacturing, the impeller can be designed so as to be additive manufactured. Therefore, deformation of the impeller during additive manufacturing can be suppressed, and thus formation defects can be suppressed. You can

According to one embodiment of the present invention, in the case of forming an impeller by additive manufacturing, by designing the impeller to be additive manufacturing, it is possible to suppress deformation of the impeller during additive manufacturing and to prevent formation defects. Can be suppressed.

It is sectional drawing which shows the structure of the pump which concerns on this embodiment. It is a front view of the pump casing of the pump shown in FIG. It is sectional drawing of the impeller shown in FIG. FIG. 4 is a partially cut front view of the impeller according to the first example of the present embodiment as seen from the suction port side of FIG. 3. It is a front view of the impeller which concerns on the 2nd Example which concerns on this embodiment, when it sees from the suction inlet side of FIG. It is an example of a pump selection diagram. It is a schematic block diagram of the manufacturing system of the impeller which concerns on this embodiment. It is a graph which shows an example of the relationship between the total head and the discharge flow rate. It is a figure for demonstrating the case where it changes so that the outer diameter of an impeller may become large. It is a flow chart which shows an example of the flow of the manufacturing method of the impeller concerning this embodiment.

Hereinafter, each embodiment will be described with reference to the drawings. However, more detailed description than necessary may be omitted. For example, detailed description of well-known matters and repeated description of substantially the same configuration may be omitted. This is for avoiding unnecessary redundancy in the following description and for facilitating understanding by those skilled in the art.

In the present embodiment, a structure serving as a prototype of the impeller according to the present embodiment is formed on the base plate by an additive manufacturing method using metal powder. Here, in the additive manufacturing method, the metal powder arranged according to the desired shape of the impeller is sintered by thermal energy such as laser or electron beam. By sequentially repeating the steps of arranging and sintering the metal powder, the sintered metal powder is laminated to form a structure that is a prototype of the impeller having a desired shape.

FIG. 1 is a cross-sectional view showing the structure of the pump according to this embodiment. FIG. 2 is a front view of the pump casing of the pump shown in FIG. As shown in FIGS. 1 and 2, the pump includes a pump casing 1 having a suction port 1a and a discharge port 1b, and a casing cover 2. The impeller 3 is arranged inside the pump casing 1 so that its suction port faces the suction port 1 a of the pump casing 1, and the fluid that has entered the pump casing 1 through the suction port 1 a passes through the impeller 3 The pressure is increased and discharged from the discharge port 1b of the pump casing 1 to the outside. The impeller 3 is fixed to an end portion of a pump shaft 6, which is a main shaft supported by bearings 5a and 5b incorporated in a bearing body 4, on the pump casing 1 side. A drive machine (not shown) is connected to the other end of the pump shaft 6, and the impeller 3 is rotationally driven via the pump shaft 6. FIG. 2 shows a view of the pump casing 1 viewed from the suction port 1a side.

FIG. 3 is a cross-sectional view of the impeller shown in FIG. FIG. 3 shows the outlet width B2 of the flow path 20 formed between the main plate 11 and the side plate 12.

<First embodiment>
FIG. 4 is a partially cut front view of the impeller according to the first example of the present embodiment as viewed from the suction port side of FIG. 3. As shown in FIG. 4, the impeller 3 includes an impeller hub 10, a main plate 11, a side plate 12, and a plurality of main wings 13 arranged between the main plate 11 and the side plates 12. The impeller hub 10 is a rotating body which is fixed to the pump shaft 6 and to which the main wing 13 is attached. The main plate 11 is a side wall of the side walls forming the impeller 3 and connected to the impeller hub 10. The side plate 12 is a side wall of the side walls forming the impeller 3 that is supported by the main wing 13. The main wing 13 is a blade that gives energy to the pumped liquid, and is attached to the impeller hub 10. In this example, the main wing 13 is formed in a plate shape with a thickness t1 and is provided between the front surface 13a of one main wing 13 on the rotation direction side and the back surface 13b of the other main wing 13 on the anti-rotation side of the other main wing 13. The flow paths 20 are formed in sections. In the first embodiment, as an example, the material used in the additive manufacturing of the impeller is titanium. This is because titanium is unlikely to cause defective molding, and therefore, defective molding is unlikely to occur even if there is a relatively large distance d1 between the adjacent main wings 13. Further, by not providing the intermediate wing between the main wings 13, the material used can be reduced.

<Second embodiment>
FIG. 5 is a partially cut front view of the impeller according to the second example of the present embodiment as viewed from the suction port side of FIG. 3. Compared with the impeller according to the first embodiment of FIG. 4, the impeller according to the second embodiment of FIG. 5 is further disposed between the main plate 11 and the side plate 12, and has two adjacent main blades. A plurality of intermediate blades 14 provided between the two are provided. The impeller according to the second embodiment of FIG. 5 is an impeller having the same diameter as the impeller according to the first embodiment of FIG. 4 and formed by the same means in additive manufacturing. The distance between the intermediate wing 14 and the adjacent main wing 13 is separated by a distance d at each point of the contour of the intermediate wing 14. This distance d is determined within a range of a limit distance D or less at which deformation does not occur in the main plate 11 and/or the side plate 12 in additive manufacturing. The limit distance D is determined according to the material used in additive manufacturing, the additive manufacturing method, and the like.

In the second embodiment, as an example, the material used in the additive manufacturing of the impeller is stainless steel. Molding failure is more likely to occur in stainless steel than in titanium, and the distance between adjacent main blades 13 in the impeller increases toward the outer circumference. By supporting the main plate 11 or the side plate 12 with the intermediate wing 14 between the main wings 13, it is possible to suppress the deformation of the main plate 11 and/or the side plate 12 in the additive manufacturing process.

That is, the limit distance D1 of titanium, which is the material of the impeller 3 of the first embodiment, is longer than the limit distance D2 of stainless steel, which is the material of the impeller 3 of the second embodiment (D1>D2). Therefore, in the first embodiment, the maximum distance d0 between the adjacent main wings 13 (the length of the circumference of the main plate 11 between the adjacent main wings 13) is equal to or less than the limit distance D1 (d0<D1) of titanium. The main plate 11 and the side plate 12 can be supported only by the main wing 13. On the other hand, in the second embodiment, since the maximum distance d0 between the adjacent main blades 13 is larger than the limit distance D2 (d0>D2) of stainless steel, the intermediate blade 14 is provided and the main blade 11 is attached to the intermediate blade 14. By supporting the side plate 12 and the side plate 12, deformation of the main plate 11 and/or the side plate 12 is suppressed in the process of additive manufacturing. If it is necessary to support the suction side (the center side of the blade) due to the large diameter of the blade, the main blade may be added instead of the intermediate blade.

In additive manufacturing, when forming a laminated surface, it is necessary to support from below from a predetermined interval in order to suppress deformation, and in general, in order to support the support member removed in the manufacturing process. Used. However, it is difficult to form a support member between the main plate 11 and the side plate 12 and remove the support member. This is because there is a flow path between the main plate 11 and the side plate 12, and if the support member is not completely removed and remains, or if the flow path is accidentally damaged in the process of removing the support member, pressure loss, etc. As a result, the performance desired by the customer (that is, the designed performance) cannot be secured. Therefore, when molding an impeller by additive manufacturing, it is advisable to design the flow path between the main plate 11 and the side plate 12 to be additive manufactured without processing such as changing the shape as much as possible, and to meet customer requirements.

FIG. 6 is an example of a pump selection diagram. As shown in FIG. 6, in the pump selection diagram, the horizontal axis represents the discharge amount of the pump and the vertical axis represents the total head. Further, in the pump selection diagram, selectable regions are assigned to each model (that is, model A, model B, model C). For example, when the customer request is the discharge amount and the total head at the operating point X, the model B pump is selected.

FIG. 7 is a schematic configuration diagram of the impeller manufacturing system according to the present embodiment. FIG. 8 is a graph showing an example of the relationship between the total head and the discharge flow rate in the selected pump model. As shown in FIG. 7, the impeller manufacturing system S<b>1 includes an information processing device 7 and an additive manufacturing machine 8. As shown in FIG. 7, the information processing device 7 includes a storage 71, a memory 72, an input interface 73, an output interface 74, a communication module 75, and a processor 76.
Here, the storage 71 stores the program and various data according to the present embodiment to be read and executed by the processor 76. The storage 71 is a non-volatile memory, such as a ROM (Read Only Memory) or a flash memory. The memory 72 temporarily holds data and programs. The memory 72 is a volatile memory, for example, a RAM (Random Access Memory).

The input interface 73 is a GUI (Graphical User Interface) and receives an input from a user.
The output interface 74 is connected to the additive manufacturing machine 8 and outputs a signal to the additive manufacturing machine. In one embodiment, the output interface 74 may also function as a GUI (Graphical User Interface).
The communication module 75 is connected to the network and communicates with other computers connected to the network. In one embodiment, the communication module 75 may be networked with the additive manufacturing machine 8 to output signals to the additive manufacturing machine.

The processor 76 loads the program according to the present embodiment from the storage 71 into the memory 72 and executes a series of instructions included in the program, whereby the pump model selection unit 760, the outer diameter determination unit 761, and the shape determination unit 762. , The performance calculation unit 763, the determination unit 764, and the determination unit 765 again. Here, the impeller design system S11 according to the present embodiment includes the outer diameter determination unit 761, the shape determination unit 762, the performance calculation unit 763, the determination unit 764, and the determination unit 765 again.

The pump selection unit 760 selects, from a plurality of pump model groups, a pump model that satisfies a customer request input by the user via the input interface 73, for example. For example, the pump selection unit 760 can be used for applications (land pumps, submersible pumps, etc.), pumped liquids (fresh water, sewage, filth, miscellaneous drainage, seawater, etc.), installation conditions (vertical, horizontal, self-priming, portable, etc.), Select a pump that meets customer requirements such as pump performance (lift, water volume, shaft power, etc.). Specifically, the storage 71 is a data table or a selection program capable of selecting a pump model group corresponding to the use, pumping, installation condition, etc. (here, model A and model B shown in FIG. 6). , Model C constitutes one pump model group.) A pump selection diagram (for example, Fig. 6) showing the selection range for each pump type, a representative performance curve for each pump model, etc. are stored, and the selection application, pumping, and installation status are stored. From the pump selection chart (eg, FIG. 6) of the pump model group selected from the plurality of pump model groups, etc., the customer's requested head and discharge flow rate (eg, operating point X in FIG. 6) are within the selected range. Select the pump model (Pump model B in the example of FIG. 6).

The outer diameter determination unit 761 determines the outer diameter of the impeller used for the pump, using the selected pump model and the relationship between the blade diameter and the operating point. Specifically, as shown in FIG. 8, when the outer shape of the blade becomes smaller, the discharge flow rate and the total head become smaller. The discharge flow rate is proportional to the m-th power of the outer shape ratio of the blade, and the lift is proportional to the n-th power of the outer shape ratio of the blade (m and n are constants determined by the pump model, the shape of the impeller, etc.). The storage 71 stores a data table or a calculation formula indicating the relationship between the blade diameter and the operating point, and the outer diameter determination unit 761 determines the pump model and the lift required for the pump based on the calculation formula or the data table. The outer diameter of the impeller 3 that satisfies the discharge flow rate is determined.

The shape determination unit 762 determines the optimum design shape of the impeller for additive manufacturing of the impeller. Specifically, the shape determining unit (design changing unit) 762 changes the design of the impeller based on the information of the impeller so as to add an intermediate blade required for layered manufacturing of the impeller. For example, the shape determining unit 762 uses the impeller of the pump model B selected by the pump selecting unit 760 and the information on the material of the impeller 3 to determine the intermediate blade 14 provided between the adjacent main blades 13. Determine the shape and layout. The material of the impeller may be a standard material determined by the pump model, or may be changed according to the customer's request such as a special purpose. Specifically, for example, the storage 71 stores the shape of the impeller (the number and arrangement of the main blades) for each pump model, and a data table or a relational expression indicating the relationship between the impeller material and the limit distance D. The shape determining unit 762 stores the shape, the arrangement mode, and the number of intermediate blades 14 to be added when the impeller is formed by additive manufacturing, based on the shape of the impeller and the limit distance D. ..
According to this configuration, in the case of forming by additive manufacturing, even if the distance between the main blades 13 of the pump model selected by the pump selection unit 760 is wide, the intermediate blades 14 of the adjacent main blades 13 are By providing the gap between the main plate 11 and/or the side plate 12, deformation of the main plate 11 and/or the side plate 12 can be suppressed, and thus formation defects can be suppressed.

Specifically, for example, the shape determining unit 762 uses the information on the distance d between the adjacent main blades 13 on the laminated surface on which the adjacent main blades 13 are formed and the material of the impeller to determine whether or not the intermediate blade 14 is necessary. (For example, it is determined whether or not the distance d between the main wings 13 is less than or equal to the limit distance D depending on the material of the impeller), and when the intermediate blade 14 is required (for example, between the main wings 13). When the distance d exceeds the limit distance), the intermediate blade 14 is added, and when the intermediate blade 14 is not necessary (for example, when the distance d between the main blades 13 is equal to or less than the limit distance), the pump selection unit The shape of the impeller 3 is determined by the main wing 13 of the pump model selected by 760. As a result, the intermediate blade is added so that the distance on the laminated surface between the plurality of main blades 13 becomes smaller than the predetermined allowable distance that differs depending on the material of the impeller. Here, when the impeller is a closed impeller as shown in FIG. 5, the laminated surface between the main blades is the main plate 11 or the side plate 12 of the impeller formed after the main blade 13. According to this configuration, the main blade 13 When the distance d between the main blades 13 exceeds the limit distance, formation defects of the intermediate blades 14 are suppressed, and when the distance d between the main blades 13 is less than the limit distance, the selection is performed. By modeling the impeller selected from the figure, the procedure of fluid analysis can be omitted and the number of design steps can be reduced.

When the intermediate blade 14 is added, the performance calculation unit 763 performs fluid analysis with the impeller 3 to which the intermediate blade 14 is added. Here, this fluid analysis is, for example, CFD (Computational Fluid Dynamics), and may be performed by a known simulation. At that time, for example, when the intermediate blade 14 is required, the performance calculation unit 763 may perform fluid analysis only on the influence of the intermediate blade 14 and reflect the fluid analysis result on the performance curve. As a result, the number of man-hours for fluid analysis can be reduced, and more accurate analysis results can be obtained.
Further, the fluid analysis result of the pump model B using the impeller 3 with the additional intermediate blades 14 is compared with the performance curve diagram of the pump model B with the impeller 3 before the additional intermediate blades 14 are added. You may. As a result, it is possible to compare the performance of the impeller 3 to which the intermediate blade 14 is added because it is formed by the additive manufacturing and the impeller 3 without the intermediate blade 14 formed by, for example, casting.

FIG. 8 shows a selection range in the pump model B including the impeller 3 to which the intermediate blade 14 is added for forming by additive manufacturing. The performance calculation unit 763 determines the selection range C1 (see FIG. 8A) in the pump model B including the impeller 3 to which the intermediate blade 14 is added. The selection range is within a range in which the pump performance can be guaranteed, and may be determined based on the highest efficiency point of the pump performance, for example. For example, the range of the head and the discharge flow rate within ±10% of the maximum efficiency point of pump performance.

The determination unit 764 determines whether the fluid analysis result (for example, the lift and the discharge flow rate) satisfies the required level. The request level is, for example, the operating point X which is the lift and discharge flow rate requested by the customer. As shown in FIG. 8A, when the operating point X falls within the selection range C1 in the pump model B including the impeller 3 to which the intermediate blade 14 is added, the determination unit 764 is formed by additive manufacturing. The output interface 74 is controlled to output a signal including the determined outer diameter of the impeller and the determined shape of the impeller to the additive manufacturing machine 8. After that, the additive manufacturing machine 8 uses the determined outer diameter of the impeller 3 and the determined number of the main blades 13 provided in the impeller 3, or the number of the main blades 13 and the number of the intermediate blades 14 for the blade. Car 3 is additive manufactured. According to this configuration, it is possible to ensure that the additive manufacturing can be performed while the lift and the discharge flow rate satisfy the required levels, and it is possible to suppress the formation failure in the additive manufacturing.

Again, the determination unit 765 selects when the fluid analysis result (for example, the lift and discharge flow rate) does not satisfy the required level, that is, the operating point X requested by the customer is the fluid analysis result, as shown in FIG. 8B. Outside the range C1′, the design shape of the impeller 3 is changed, and the fluid is analyzed again with the changed design shape to determine again the relationship between the head and the discharge flow rate. Here, the change in the design shape of the impeller is, for example, the change in the shape of the intermediate blade, the change in the outer diameter of the impeller 3, and/or the change in the blade angle of the main blade 13 and/or the intermediate blade 14.

FIG. 9 is a diagram for explaining a case where the outer diameter of the impeller is changed to be large. As shown in FIG. 8(B), when the operating point X requested by the customer is higher than the selection range C1′ which is the fluid analysis result, the outer diameter of the impeller is increased so that it falls within the selection range C1′. Operating point X may enter. However, as shown in FIG. 9, when the outer diameter of the impeller 3 is increased to the broken line 121 as shown by the arrow A1, the distance of the main wing 13 on the outer peripheral surface of the main plate 11 increases from L1 to L2. As a result, the main plate on the outer peripheral surface side and/or the side plate on the outer peripheral surface side may be deformed during the additive manufacturing.

In order to prevent this deformation, the re-determination unit 765 according to the present embodiment, for example, when changing the design shape of the impeller 3 when re-determining the relationship between the lift and the discharge flow rate, When the outer diameter of the impeller 3 after the change is larger than the outer diameter before the change, the design shape of the intermediate blade 14 is changed (for example, the intermediate blade 14 is extended to the vicinity of the outer peripheral surface of the impeller 3). Make design changes. Then, the determining unit 765 determines again whether or not the modified design shape can be additively manufactured (whether or not the distance d between the main wings 13 is the limit distance D or less), and the additive manufacturing can be performed (between the main wings 13). If the distance d≦the limit distance D), the selected range is determined again by performing a fluid analysis again with the changed design shape. For example, when the outer diameter of the impeller 3 after the change is larger than the outer diameter before the change, by extending the intermediate blade 14 to the vicinity of the outer peripheral surface of the impeller 3, it is possible to perform additive manufacturing with the changed design shape. You can According to this configuration, it is possible to suppress the formation failure in the additive manufacturing while ensuring that the additive manufacturing can be performed even when the outer diameter of the impeller 3 after the change is larger than the outer diameter before the change. Also, in one embodiment, the determining unit 765 may change the performance by changing the blade angles of the main wing 13 and/or the intermediate wing 14. Generally, the flow rate of a pump changes almost in proportion to the blade angle for a certain head. Therefore, the blade angles of the main wing 13 and/or the intermediate wing 14 may be changed so as to satisfy the operating point X requested by the customer.

The determination unit 764 determines whether the shape of the impeller 3 determined again by the determination unit 765 satisfies the required level. When the shape of the impeller 3 determined again satisfies the required level, the determination unit 764 outputs the signal including the information about the changed design shape of the impeller 3 to the additive manufacturing machine 8. Control 74. After that, the additive manufacturing machine 8 performs additive manufacturing of the impeller 3 with the changed design shape of the impeller 3. According to this configuration, the impeller 3 is layered and shaped with the design shape of the impeller 3 changed for each customer's request. Therefore, it is possible to manufacture the impeller satisfying the individual required level in a short delivery time as compared with the case where the impeller is manufactured by casting or welding.

As described above, the impeller design system S11 according to the present embodiment determines the outer diameter of the impeller used for the pump, using the lift required for the pump and the discharge flow rate required for the pump. By using the outer diameter determining unit 761, the determined outer diameter of the impeller 3 and information on the metal material used when the impeller 3 is layered and molded, the impeller 3 is layered and modeled. The shape determining unit 762 determines the necessary number of main blades 13 provided on the impeller 3 or the number of intermediate blades 14 provided between the adjacent main blades 13.

According to this configuration, in the case of forming by laminated manufacturing, even if the distance between the main wings 13 increases, the intermediate blades 14 are provided between the adjacent main wings 13 so that the main plate 11 Since the deformation of the side plate 12 and/or the side plate 12 can be suppressed, defective formation can be suppressed.

Further, the impeller manufacturing system S1 according to the present embodiment determines the outer diameter of the impeller 3 used for the pump, using the lift required for the pump and the discharge flow rate required for the pump. The outer diameter determining unit 761 is provided. Further, the impeller manufacturing system S1 laminate-molds the impeller 3 by using the determined outer diameter of the impeller 3 and the information of the metal material used when the impeller 3 is additive-molded. A shape determining unit 762 that determines the number of main blades 13 provided in the impeller 3 or the number of intermediate blades 14 provided between the adjacent main blades 13 necessary for the above. Further, the impeller manufacturing system S1 uses the determined outer diameter of the impeller, the number of main wings 13 provided in the impeller 3, or the number of main wings 13 and the number of intermediate wings 14, A performance calculation unit 763 is provided that determines the relationship between the head and the discharge flow rate by performing fluid analysis. Further, in the impeller manufacturing system S1, the determined outer diameter of the impeller 3 and the determined main blade 13 provided in the impeller 3 when the determined head and discharge flow rate satisfy the required levels. Or the number of the main blades 13 and the number of the intermediate blades 14 are included in the laminate molding machine 8 for laminate-molding the impeller 3.

According to this configuration, in the case of forming by laminated manufacturing, even if the distance between the main wings 13 increases, the intermediate blades 14 are provided between the adjacent main wings 13 so that the main plate 11 Since the deformation of the side plate 12 and/or the side plate 12 can be suppressed, defective formation can be suppressed.

Next, the flow of the method for designing the impeller according to this embodiment and the method for manufacturing the impeller according to this embodiment will be described with reference to FIG. 10. FIG. 10 is a flowchart showing an example of the flow of the method for manufacturing an impeller according to this embodiment. In this embodiment, the flowchart of FIG. 10 is implemented by the design system S1.

(Step S110) First, for example, a manufacturer who manufactures the impeller 3 inputs a customer request using the input interface 73. The customer request includes at least one of the above-mentioned customer requirements (use, pumping, installation status, performance, operating point X, etc.). That is, the input interface 73 receives a customer request from a manufacturer. As a result, the processor 76 acquires the customer request. In addition, in order to simplify the description, in the present embodiment, the operating point X of the customer request is input as the customer request.

(Step S120) Next, the pump model selection unit 760 selects a pump model that satisfies the customer's request input in step S110. Specifically, the pump model B corresponding to the operating point X is selected from the corresponding pump selection diagram (FIG. 6 here).

(Step S130) Next, the shape determination unit 762 determines whether or not the impeller having the outer diameter determined in step S120 can be layered (for example, whether or not the distance d between the main blades 13 is equal to or less than the limit distance D). Or whether the size of the impeller 3 is less than or equal to the maximum modeling area of the additive manufacturing machine).

(Step S140) In step S130, the impeller used in the selected pump model cannot be additively manufactured (the distance d between the main blades 13>the limit distance D, and the size of the impeller 3 is the maximum modeling area of the additive manufacturing machine. If it is determined that the above), the shape determining unit 762 uses the impeller of the pump model B selected by the pump selecting unit 760 and the information on the material of the impeller 3 to cause a gap between the adjacent main wings 13. The shape and arrangement of the intermediate blades 14 provided in the. If the size of the impeller 3 is equal to or larger than the maximum modeling area of the additive manufacturing machine, the performance is adjusted by changing the number of blades or the blade angle instead of reducing the outer diameter of the impeller.

(Step S150) Next, the performance calculation unit 763 performs fluid analysis with the impeller 3 whose shape has been changed in step S140 (for example, the impeller 3 to which the intermediate blade 14 has been added).

(Step S160) Next, the determination unit 764 determines whether the fluid analysis result satisfies the customer's request. Specifically, as shown in FIG. 8, it is determined whether the operating point X is included in the usage range, and if the operating point X is included in the usage range (FIG. 8A), the customer is If the demand is satisfied, and the operating point X is outside the usage range (FIG. 8(B)), it is determined that the customer's demand is not satisfied.

(Step S170) When the fluid analysis result does not satisfy the customer's request in step S160 (step S160: NO), the determination unit 764 determines whether the selected pump model B is incompatible. In other words, if it is determined that the operating point X is not included in the operating range even if the blade diameter or the blade angle is changed, the selected pump model B cannot be used. In that case, the process returns to step S120, and the pump is pumped again. The model is selected.

(Step S180) In step S170, if the selected pump model is not compatible, the determining unit 765 changes the design shape of the impeller 3 again. Then, returning to step S150, the fluid analysis is performed again with the changed design shape of the impeller 3. In the present embodiment, the determining unit 765 changes the design shape of the impeller 3 again and then returns to step S150. In one embodiment, the determining unit 765 may change the design shape of the impeller 3 again, and then the process may return to step S130.

(Step S190) When it is determined in step S130 that the impeller can be additively manufactured, or when the fluid analysis result satisfies the customer's request in step S160 (operation in which the selection range based on the fluid analysis result satisfies the customer's requirement) When the point X is included), for example, the processor 76 controls the additive manufacturing machine 8 via the output interface 74 so that the additive manufacturing is performed. Note that this control may be executed manually. Thereby, the additive manufacturing machine 8 effects additive manufacturing of the impeller 3 that satisfies the customer's request.

(Step S200) In step S190, the outer periphery of the laminated molding impeller 3 is cut by a lathe or the like. In order to satisfy the customer's operating point X shown in FIG. 8(A), the laminated molding impeller 3 has its outer periphery cut by a lathe or the like. In other words, in the case of FIG. 8A, the outer diameter of φ180 or more (for example, the outer diameter of φ210) is layered, and then the outer diameter is φ180 by cutting, so that the operating point X requested by the customer can be obtained. Meet However, this cutting process may be omitted, and an impeller having an outer diameter of φ180 may be formed by additive manufacturing.

As described above, the design method of the impeller according to the present embodiment is the design method of the impeller of the pump, and the impeller includes the plurality of main wings 13 that give energy to the pumping liquid, and is based on the information of the impeller. Then, there is a design change process for changing the design of the impeller so that the impeller is laminated and manufactured. According to this configuration, in the case where the impeller is formed by additive manufacturing, the design can be changed so that the impeller is additive manufactured. Therefore, deformation of the impeller during additive manufacturing can be suppressed, and thus formation defects can be suppressed. can do.

For example, in the design changing step, the design of the impeller is changed so as to add an intermediate blade required for additive manufacturing of the impeller. According to this configuration, in the case of forming by additive manufacturing, even if the distance between the main wings 13 increases, by providing the intermediate wings 14 between the adjacent main wings 13, Since the deformation during the additive manufacturing of the car can be suppressed, the formation failure can be suppressed.

Further, in the impeller designing method according to the present embodiment, the information on the impeller is the information on the material of the impeller and the distance between the adjacent main wings 13 on the laminated surface on which the adjacent main wings 13 are formed. In the design change step, the design of the impeller is changed so as to add the intermediate blade between the adjacent main blades.

According to this configuration, the distance between the main blades 13 and the intermediate blades can be set according to the distance between the adjacent main blades 13 on the laminated surface on which the adjacent main blades 13 are formed and the material of the impeller. Therefore, the deformation of the impeller during the additive manufacturing can be suppressed.

Further, in the design method of the impeller according to the present embodiment, in the design change step, the intermediate blade is configured such that the distance in the laminated surface between the plurality of main blades is shorter than a predetermined allowable distance that varies depending on the material of the impeller. Change the design of the impeller to add. According to this configuration, the distance between the main blade 13 and the intermediate blade 14 can be made shorter than a predetermined allowable distance according to the material of the impeller, so that the deformation of the impeller during additive manufacturing is suppressed. You can

In the method for designing an impeller according to the present embodiment, as an example, the impeller is a closed impeller, and the laminated surface between the main blades is a main plate or a side plate of the impeller formed after the main blade. is there. According to this configuration, on the surface of the main plate or the side plate formed on the impeller, the distance between the main wing 13 and the intermediate wing 14 can be made shorter than a predetermined allowable distance according to the material of the impeller. Therefore, the deformation of the impeller during additive manufacturing can be suppressed.

Further, the impeller design method according to the present embodiment further includes, after the design change step, a step of performing a fluid analysis on the pump including the impeller provided with the intermediate blade. With this configuration, it is possible to confirm whether or not the impeller provided with the intermediate blade meets the customer's request by performing a fluid analysis on the impeller provided with the intermediate blade due to the design change.

Further, in the impeller design method according to the present embodiment, when the selection range based on the result of the fluid analysis includes an operating point that satisfies the customer requirement, the additive manufacturing machine is controlled so that additive manufacturing is performed. Have steps. With this configuration, when the impeller provided with the intermediate blades meets the customer requirements due to the design change, the impeller can be manufactured with the design.

Further, in the method for designing an impeller according to the present embodiment, when the selection range based on the result of the fluid analysis does not include an operating point that satisfies the customer requirement, information on the material of the impeller and a design shape of the impeller Of these, at least one is changed, and after the change, the step of performing fluid analysis again (corresponding to step S180 and step S150 after NO in step S160 of FIG. 10) is further included. With this configuration, it is possible to confirm whether or not the changed impeller satisfies the customer's request before manufacturing by additive manufacturing by performing a fluid analysis of the changed impeller.

In addition, the impeller design method according to the present embodiment includes a step of selecting a pump model from a plurality of pump model groups according to a customer request (corresponding to step S120 in FIG. 10) and a selection based on the result of the fluid analysis. When the range does not include an operating point that satisfies the customer requirement, the step of reselecting the selected pump model (corresponding to step S120 after YES in step S170 of FIG. 10) is further included. With this configuration, it is possible to meet customer requirements by re-selecting the pump model.

In the present embodiment, the material forming the impeller is not limited to metal, but may be synthetic resin, carbon, or a composite material. In that case, synthetic resin powder, carbon powder, or composite material. You may laminate-mold using the powder of. Further, in each of the embodiments, the powder is used for additive manufacturing, but the present invention is not limited to this, and wire additive may be applied for additive manufacturing.

Note that at least a part of the impeller design system S1 described in the above-described embodiment may be configured by hardware or software. When it is configured by hardware, a program that realizes at least a part of the functions of the impeller design system S1 may be stored in a recording medium such as a flexible disk or a CD-ROM, and may be read and executed by a computer. .. The recording medium is not limited to a removable medium such as a magnetic disk or an optical disk, and may be a fixed recording medium such as a hard disk device or a memory.

Moreover, you may distribute the program which implement|achieves at least one part function of the impeller design system S1 via communication lines (a wireless communication is also included), such as the internet. Furthermore, the program may be distributed in a state of being encrypted, modulated, or compressed via a wired line or wireless line such as the Internet or stored in a recording medium.

Further, the impeller design system S1 may be operated by one or more information processing devices. When using a plurality of information processing devices, one of the information processing devices may be a computer, and the computer may execute a predetermined program to realize a function as at least one means of the impeller design system S1. Good.

Further, in the method invention, all steps may be automatically controlled by a computer. Further, the progress of the steps may be controlled manually by a computer while the steps are performed by a computer. Furthermore, at least a part of all the steps may be performed manually.

As described above, the present invention is not limited to the above-described embodiments as they are, and constituent elements can be modified and embodied without departing from the scope of the invention in an implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, the constituent elements of different embodiments may be combined appropriately.

DESCRIPTION OF SYMBOLS 1 Pump casing 1a Suction port 1b Discharge port 11 Main plate 11a Outer peripheral surface 12 Side plate 12a Outer peripheral surface 13 Main wing 13a Front surface 13b Rear surface 14 Intermediate blade 2 Casing cover 20 Channel 21 Base plate 22-28 Support member 3 Impellers 30, 40, 40c , 51, 52, 64a, 64b, 65a, 65b, 66a, 66c, 82, 83 Reinforcing members 31, 41, 41c First member 32, 42 Second member 4 Bearing body 43, 43b Second reinforcing member 5a Bearing 6 Pump shaft 7 Information processing device 71 Storage 72 Memory 73 Input interface 74 Output interface 75 Communication module 76 Processor 761 Outer diameter determination unit 762 Shape determination unit 763 Performance calculation unit 764 Determination unit 765 Determination unit 8 Additive molding machine

Claims (14)

A method of designing an impeller of a pump,
The impeller includes a plurality of main wings that give energy to the pumping liquid,
An impeller designing method comprising: a design changing step of changing the design of the impeller so as to laminate-mold the impeller based on the information of the impeller. In the design changing step, the design of the impeller is changed so as to add an intermediate blade necessary for additive manufacturing of the impeller,
The method for designing an impeller according to claim 1. The information on the impeller is
Information on the material of the impeller,
Including the distance between the adjacent main wings in the laminated surface on which the adjacent main wings are formed,
In the design changing step, changing the design of the impeller so as to add the intermediate blade between the adjacent main blades,
The method for designing an impeller according to claim 1 or 2. In the design changing step, the design of the impeller is changed to add the intermediate blade so that the distance in the laminated surface between the plurality of main blades is shorter than a predetermined allowable distance that differs depending on the material of the impeller,
The method for designing an impeller according to claim 3. The impeller is a closed impeller,
The laminated surface between the main wings is a main plate or a side plate of the impeller formed after the main wings,
The method for designing an impeller according to any one of claims 1 to 4. The impeller design method according to any one of claims 1 to 5, further comprising a step of performing a fluid analysis on the pump including the impeller provided with the intermediate blade after the design changing step. The method for designing an impeller according to claim 6, further comprising: controlling an additive manufacturing machine so that additive manufacturing is performed when a selected range based on a result of the fluid analysis includes an operating point that satisfies the customer requirement. .. When the selected range based on the result of the fluid analysis does not include an operating point that satisfies the customer's requirement, at least one of the information on the material of the impeller and the design shape of the impeller is changed, and after the change, the operation is performed again. The impeller design method according to claim 6 or 7, further comprising a step of performing fluid analysis. The process of selecting a pump model from multiple pump model groups according to customer requirements,
Reselecting the selected pump model when the selection range based on the result of the fluid analysis does not include an operating point that satisfies the customer requirement,
The impeller design method according to any one of claims 6 to 8, further comprising: The impeller design method according to any one of claims 1 to 9, wherein in the design changing step, an outer diameter of the impeller is changed, and/or a blade angle of a main blade and/or an intermediate blade is changed. An impeller manufacturing method for forming an impeller designed by the method for designing an impeller according to any one of claims 1 to 10 by additive manufacturing. An impeller design system for a pump, comprising:
An impeller design system, comprising: a design change unit that changes the design of the impeller so that the impeller is layered based on the information of the impeller. The design change section changes the design of the impeller so as to add an intermediate blade necessary for additive manufacturing.
The impeller design system according to claim 12. An impeller manufacturing system for a pump, comprising: a plurality of main blades for providing pumping liquid with energy.
A design change unit for changing the design of the impeller so as to laminate-mold the impeller based on the information of the impeller;
An additive manufacturing machine that additive-molds the impeller after design change,
An impeller manufacturing system equipped with.