JP4460863B2 - Discharge bowl for pump and manufacturing method thereof - Google Patents

Description

  The present invention relates to a pump discharge bowl used in general industrial pumps such as a vertical axis, horizontal axis, and oblique axis pumps, and a method for manufacturing the pump bowl. The present invention relates to a pump discharge bowl and a method for manufacturing the same.

  For example, as shown in FIG. 8, a general longitudinal mixed-flow pump has a suction bell 16 on the upstream side of an impeller housing 14 that houses an impeller 12 attached to the main shaft 10 and a discharge bowl 18 on the downstream side. The discharge elbow 20 is connected to the downstream side of the discharge bowl 18. As a result, as the impeller 12 rotates, the handling liquid sucked from the suction bell 16 is changed into a flow along the axial direction by the discharge bowl 18 and is sequentially discharged from the discharge elbow 20.

The discharge bowl 18 includes a substantially cylindrical inner cylinder 24 in which a bearing case 22 is mounted, a substantially cylindrical outer cylinder 26 concentrically surrounding the inner cylinder 24, and an inner cylinder 24 and an outer cylinder 26. It is mainly composed of a plurality of draft in the wings (rectification plate) 28 disposed between the. This guide vane 28 performs a rectifying action of the handling liquid flowing between the inner cylinder 24 and the outer cylinder 26 as the impeller 12 rotates, and substantially flows at a predetermined pitch along the circumferential direction. They are arranged in parallel along the direction.

  Conventionally, this type of discharge bowl 18 is generally manufactured by casting in which an inner cylinder 24, an outer cylinder 26, and a plurality of guide vanes 28 are integrated. This is because, for example, as shown in FIGS. 9A to 9C, the guide vanes 28 that act to rectify the handling liquid have an uneven thickness along the length direction (flow direction). This is because the geometrical shape is not flat but has a twisted and complicated three-dimensional shape, which makes the mold in press forming complicated and generally difficult to form with a steel plate.

  As described above, in order to produce the discharge bowl by casting, it is necessary to produce a casting mold (wood) or to produce a mold or a lost model (lost wax) and perform casting. is there.

  However, for example, in order to produce a casting mold, it is necessary to use a wooden drawing of a wooden mold, a process period for manufacturing the wooden mold, a wooden craftsman, and a large amount of high-quality wood. For this reason, not only does the construction period become long and quite expensive, but it also violates the request to reduce the use of wood as much as possible to conserve resources and protect the forest. Casting and casting operations require casting factories, casting production periods, casting craftsmen, and a large amount of foundry sand and ore to be melted. This will lead to price increase and further environmental pollution.

  For this reason, among the components of the discharge bowl, the substantially cylindrical inner and outer cylinders are not only cast using a wooden mold but also made of steel plates. However, as described above, the guide blade has a complicated three-dimensional shape, and press forming with a steel plate is generally difficult. Therefore, the guide blade must be manufactured by casting using a wooden mold or the like. Met.

  The present invention has been made in view of the above circumstances, and for pumps capable of making all the components of the discharge bowl, including guide vanes having a complicated shape, into a steel plate without casting using a wooden mold or the like. An object of the present invention is to provide a discharge bowl and a method for manufacturing the same.

The invention according to claim 1 is a substantially cylindrical inner cylinder made of steel plate, a substantially cylindrical outer cylinder made of steel plate surrounding the periphery of the inner cylinder concentrically, an outer peripheral surface of the inner cylinder, and the a plurality of guide vanes disposed between the inner peripheral surface of the outer cylinder, before Symbol draft within wing guide vane the NC data by converting the blade surface shape of the guide vanes in two axes of the NC data A steel plate cut out along the contour of the NC data was obtained by computer analysis with the flow direction as the X axis, the diameter direction as the Y axis, and the circumferential direction as the Z axis. The inner cylinder is manufactured by roll molding, the outer cylinder is manufactured by roll molding, and the guide blades are manufactured by press molding along the shape of the blade surface coordinates of the guide blades. The inner end face of each guide blade is connected to the outer peripheral surface of the inner cylinder via the coordinate position scribed on the flat plate before molding, and the outer end face of each guide blade is Characterized in that joined respectively to the inner peripheral surface of the outer cylinder through the coordinate position scribed in a plane plate before molding, is disposed between the outer cylinder and the inner cylinder arranged concentrically This is a discharge bowl for a pump.

  In this way, all the components of the discharge bowl, including the guide vanes that have a geometrically complex shape, are manufactured from steel plates (made into cans) and discharged without casting using a wooden mold. By configuring the bowl, it is possible to reduce the weight and cost of the discharge bowl and shorten the production period.

According to the second aspect of the present invention, a substantially cylindrical inner and outer cylinders are manufactured by roll forming a steel plate, the blade surface shape of the guide blade is converted into biaxial NC data, and the NC data is converted into the guide blade. A steel plate cut out along the contour of the NC data was obtained by computer analysis with the flow direction as the X axis, the diameter direction as the Y axis, and the circumferential direction as the Z axis. by press-forming along the shape of the blade surface coordinates of the guide vanes made a plurality of guide vanes, the inner end surface of each guide vane, within said barrel through the flat plate Nike brat coordinate position before the molding The outer end surface of each guide wing is joined to the outer peripheral surface to the inner peripheral surface of the outer cylinder concentrically surrounding the inner cylinder via a coordinate position scribed on the flat plate before molding. Is a method for producing a discharge bowl for a pump.

  Guide vanes generally have a three-dimensional shape that is not flat but has a solid three-dimensional surface modeling of the profile (shape) of the guide blade obtained by computer program numerical analysis with established drawing drawing techniques. By converting to data (converting into NC data), it is possible to easily duplicate a complicated-shaped press die, and by pressing the guide blades with this duplicated die, it is possible to create a casting mold, etc. All components of the discharge bowl can be made of steel without any use.

Further, positioning of the guide blades joined to the inner peripheral surface of the outer cylinder and the outer peripheral surface of the inner cylinder with respect to the inner peripheral surface of the outer cylinder and the outer peripheral surface of the inner cylinder together with the outer cylinder and the inner cylinder is a flat plate before molding. By performing this through the coordinate position displayed as NC data, it is possible to perform the operation of joining the guide wing to the inner cylinder and the outer cylinder while easily performing this positioning.

According to a third aspect of the present invention, there is provided an impeller housing that houses an impeller therein, a suction bell connected to an upstream side of the impeller housing, and a downstream side of the impeller housing. A pump device comprising the pump discharge bowl described in 1 .

  According to the present invention, all parts of the discharge bowl including the guide vanes having a complicated shape can be manufactured from a steel plate, thereby reducing the wooden shape and reducing the weight and cost of the discharge bowl. The construction period can be shortened. Furthermore, it can contribute to prevention of environmental destruction in terms of forest protection and pollution prevention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a vertical axis mixed flow pump provided with a discharge bowl in an embodiment of the present invention. As shown in FIG. 1, the vertical axis mixed flow pump has a suction bell 36 connected to an upstream side of an impeller housing 34 that houses an impeller 32 attached to a main shaft 30 and a discharge bowl 38 connected to a downstream side. A discharge elbow 40 is connected to the downstream side of the discharge bowl 38. As a result, as the impeller 32 rotates, the handling liquid sucked from the suction bell 36 is changed into a flow along the axial direction by the discharge bowl 38 and is sequentially discharged from the discharge elbow 40.

The discharge bowl 38 includes a substantially cylindrical inner cylinder 44 in which a bearing case 42 is mounted, a substantially cylindrical outer cylinder 46 concentrically surrounding the inner cylinder 44, and an inner cylinder 44 and an outer cylinder 46. It is mainly composed of a plurality of draft in the wings (rectification plate) 48 disposed between the. This guide vane 48 rectifies the handling liquid flowing between the inner cylinder 44 and the outer cylinder 46 as the impeller 32 rotates, and is substantially in the flow direction at a predetermined pitch along the circumferential direction. Are arranged in parallel.

  The inner cylinder 44 is manufactured by roll forming a steel plate into a substantially cylindrical shape, and the outer cylinder 46 is also manufactured by roll forming a steel plate into a substantially cylindrical shape. That is, both the inner cylinder 44 and the outer cylinder 46 have a constant thickness and a substantially true cylindrical shape. On the other hand, the guide vane 48 that rectifies the handling liquid has a substantially straight shape and a substantially linear shape as described below, and is manufactured by press-molding a steel plate. That is, the guide blade 48 has a predetermined shape by cutting a flat plate into a predetermined shape and press-molding it.

  The guide blades 48 are arranged in parallel at a predetermined pitch at predetermined positions along the circumferential direction between the inner cylinder 44 and the outer cylinder 46 arranged concentrically, and the inner side end faces are arranged on the inner cylinder. The outer side end surfaces of the outer side surfaces 44 are joined and fixed to the inner peripheral surface of the outer body 46. As a result, a discharge bowl 38 comprising an inner cylinder 44, an outer cylinder 46, and a plurality of guide blades 48, all made of steel plate, is formed.

  In this way, the inner body 44 and the outer body 46 including the guide wing 48 having a geometrically complicated shape are manufactured (made into a can) from a steel plate without casting using a wooden mold or the like. By configuring the discharge bowl 38, it is possible to reduce the wooden shape, to reduce the weight and cost of the discharge bowl 38, and to shorten the construction period in production.

  Next, an example of manufacturing the guide blade 48 will be described. First, the blade surface profile (shape) of the guide blade 48 having a desired shape is converted into solid blade surface data (converted into NC data) by computer analysis. FIG. 2 shows a state in which the NC data (developing coordinates) obtained on the plate upper surface is scribed (plotted) on the upper surface of the flat plate obtained with the flow direction as the X axis and the diameter direction as the Y axis. As a result, the press forming of the guide blade 48 is completed, and the material of the guide blade before bending is completed by cutting along the contour. At this time, it is desirable to make NC data by designing as close to a straight horizontal plane as possible so that the guide blade can be easily pressed.

  Next, the flow direction shown in FIG. 4 at the coordinate streamline position (II coordinate streamline to VV coordinate streamline) of the discharge bowl 38 shown in FIG. Is obtained by computer analysis (NC data), and press molding is performed along the shape of the blade surface coordinates. The guide wing 48 having a desired shape is press-molded by producing a press die having a shape along the shape of this and performing press working using the press die.

  6 and FIG. 6 at the coordinate streamline position (II coordinate streamline to VV coordinate streamline) and sectional position (dual section to section) of the discharge bowl 38 shown in FIG. As shown in Fig. 7, the mounting coordinates of the guide vanes with the X axis as the circumferential direction, the Y axis as the diameter direction, and the Z axis as the flow direction are obtained by computer analysis (converted into NC data), and the guide vanes are positioned along the mounting coordinates. The discharge bowl 38 is completed by joining the inner end surface of the guide vane 48 to the outer peripheral surface of the inner cylinder 44 and the outer end surface of the guide vane 48 to the inner peripheral surface of the outer cylinder 46 so that 48 is positioned.

  In this example, first, the inner end face of the guide blade 48 is temporarily fixed to the outer peripheral surface of the inner cylinder 44 and then joined, and then the inner cylinder 44 to which the guide blade 48 is joined is inserted into the outer cylinder 46. Thus, the outer end surface of the guide blade 48 is temporarily fixed to the inner peripheral surface of the outer body 46 before being joined. In particular, this work can be easily performed by using the outer body 46 having a substantially constant inner diameter.

  At this time, the joint position of the guide blade 48 is displayed as a coordinate position converted into NC data on the dimension development plane plate before plate cutting, and the coordinate position (joint position) of the inner cylinder 44 and the outer cylinder 46 is displayed on the guide blade 48. The inner cylinder 44 and the outer cylinder 46 are equally arranged in the circumferential direction by the number of sheets.

  Thus, the positioning of the guide vanes 48 joined to the inner peripheral surface of the outer drum 46 and the outer peripheral surface of the inner drum 44 with respect to the inner peripheral surface of the outer drum 46 and the outer peripheral surface of the inner drum 44 is determined. Along with the cylinder 44, it is performed via the coordinate position displayed as NC data on the flat plate before molding, so that the positioning operation is easily performed and the guide blade 48 and the inner cylinder 44 and the outer cylinder 46 are joined. be able to.

It is sectional drawing which shows the vertical axis diagonal flow pump provided with the discharge bowl in embodiment of this invention. It is a figure which shows the state which scrubbed (plotted) NC data (plate-development development coordinate) obtained by making the flow direction into the X-axis and the diameter direction into the Y-axis. It is a figure which shows the streamline position (II coordinate streamline -VV coordinate streamline) for coordinate capture of a discharge bowl. It is a figure which shows the blade | wing surface coordinate of a guide blade which made the flow direction X-axis, the diameter direction was Y-axis, and the circumferential direction was Z-axis. It is a figure which shows the streamline position (II coordinate streamline-VV coordinate streamline) for coordinate arrangement | positioning of a discharge bowl, and a cross-sectional position (2 cross sections-2 cross section). It is a figure which expand | deploys and shows the attachment coordinate of the guide blade which made the circumferential direction the X-axis, the diameter direction the Y-axis, and the flow direction was the Z-axis. It is a figure which shows the attachment coordinate of the guide vane which looked at the circumferential direction from X-axis, the diameter direction as Y-axis, and the flow direction as Z-axis from the upstream of the flow direction. It is sectional drawing which shows the vertical axis mixed flow pump provided with the conventional discharge bowl. (A) is a cross-sectional view of the guide bowl of the discharge bowl shown in FIG. 8 on the outer body side, (b) is a cross-sectional view of the middle between the outer body and the inner body, and (c) is It is sectional drawing in an inner trunk side.

Explanation of symbols

30 Main shaft 32 Impeller 34 Impeller housing 36 Suction bell 38 Discharge bowl 40 Discharge elbow 42 Bearing case 44 Inner cylinder 46 Outer cylinder 48 Guide vane

Claims (3)

A substantially cylindrical inner cylinder made of steel,
A substantially cylindrical outer cylinder made of a steel plate concentrically surrounding the inner cylinder;
A plurality of guide vanes disposed between the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder;
Before Symbol draft within wing Kegakishi the steel of the plane plate which converts the blade surface shape of the guide vanes in two axes of the NC data the guide vanes of the NC data, along the contour of the NC data cutting A steel plate is manufactured by press-molding along the shape of the blade surface coordinates of the guide blade determined by computer analysis with the flow direction as the X axis, the diameter direction as the Y axis, and the circumferential direction as the Z axis ,
The inner trunk is manufactured by roll molding,
The outer body is manufactured by roll molding,
Each guide vane has an inner end surface of each guide vane on the outer peripheral surface of the inner body via a coordinate position scribed on a flat plate before molding, and an outer end surface of each guide vane is a flat surface before molding. For a pump, characterized in that it is arranged between the outer cylinder and the inner cylinder which are concentrically arranged by being joined to the inner peripheral surface of the outer cylinder via coordinate positions marked on the face plate . Discharge bowl. A steel plate is roll-formed to produce a substantially cylindrical inner and outer body,
The blade surface shape of the guide blade is converted into biaxial NC data, and the NC data is scribed on a flat plate made of a steel plate to be the guide blade, and the flow direction of the steel plate cut out along the contour of the NC data is changed. A plurality of guide vanes are manufactured by press molding along the shape of the blade surface coordinates obtained by computer analysis with the X axis, the diameter direction as the Y axis, and the circumferential direction as the Z axis ,
Coordinates the inner end surface of each guide vane, the outer peripheral surface of the inner cylinder via a flat plate Nike brat coordinate position before the molding, wherein the outer end surface of each guide vane was scribed in a plane plate before molding A method for producing a discharge bowl for a pump, characterized by joining the inner circumference of the outer cylinder concentrically surrounding the inner cylinder via a position . An impeller housing that houses the impeller, and
A suction bell connected to the upstream side of the impeller housing;
A pump apparatus comprising the pump discharge bowl according to claim 1 connected to a downstream side of the impeller housing.

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