JP2011179465A - Discharge elbow for vertical shaft pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a discharge elbow for a vertical shaft pump, having a reduced weight while developing sufficient drag against internal pressure and discharge reaction force. <P>SOLUTION: The discharge elbow 2 for the vertical shaft pump includes a first cylindrical part 15 extending toward a discharge port in the horizontal direction and a second cylindrical part 26 extending toward a suction port in the vertical direction, wherein a curved flow path 7 is formed inside to change the flowing direction of fluid flowing along the vertical direction into the horizontal direction, and a bearing box 9 is integrally provided on the top for bearing and supporting the main shaft of the vertical shaft pump at its upper end. On either side face located on a curved portion of the flow path 7, at least one first rib 13 is erected approximately perpendicular to a contour line formed by a lower end 9a of the bearing box 9 while protruding outward. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a discharge elbow of a vertical shaft applied to a vertical shaft diagonal flow pump or a vertical shaft axial flow pump.

  A flow path having a circular shape in a sectional view that changes a flowing direction of a fluid (for example, water) flowing along a vertical direction (longitudinal direction) to a horizontal direction (lateral direction) (changes a flowing direction of the fluid by 90 degrees). For example, a discharge elbow disclosed in Patent Document 1 is known as a discharge elbow of an upright shaft pump formed inside.

JP 2002-195185 A

  However, in the one disclosed in the above-mentioned Patent Document 1, it resists internal pressure and discharge reaction force (reaction force by discharge water: force that the fluid flowing along the vertical direction tries to go straight as it is). A large number of ribs are arranged along the vertical and horizontal directions so as to cover the curved portion of the discharge elbow. As a result, the weight of the entire discharge elbow increases, and as a result, the weight of the entire vertical pump increases.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a discharge elbow of a vertical shaft that has sufficient resistance against internal pressure and discharge reaction force and can be reduced in weight. And

The present invention employs the following means in order to solve the above problems.
The discharge elbow of the vertical pump according to the present invention includes a first cylindrical portion extending in a horizontal direction toward the discharge port and a second cylindrical portion extending in a vertical direction toward the suction port, and is arranged in the vertical direction. Displacement of a vertical pump in which a curved flow path that changes the flow direction of fluid flowing along the horizontal direction is formed inside, and a bearing box that supports and supports the upper end of the main shaft of the vertical pump is integrally provided at the top. It is an elbow, and at least one first rib projecting outward while being substantially orthogonal to the contour line formed by the lower end of the bearing box is formed on both side surfaces located at the curved portion of the flow path. It is erected.

According to the discharge elbow of the vertical shaft pump according to the present invention, at least one sheet that protrudes outward is substantially orthogonal to the contour line formed by the lower end of the bearing box on each side surface located in the curved portion of the flow path. Since (for example, three) first ribs are provided, it is possible to effectively obtain a resistance against the internal pressure and the discharge reaction force.
Further, since the number of ribs is significantly reduced as compared with the conventional one, the weight can be reduced.

  In the discharge elbow of the vertical shaft pump, at least one second rib that stands in contact with the upper surface of the root portion of the first cylindrical portion and protrudes outward is provided on the front surface of the bearing housing. More preferably.

  According to the discharge elbow of such a vertical shaft pump, the resistance against the internal pressure and the discharge reaction force is increased, so that the output of the vertical pump can be increased without increasing its own size.

  The vertical shaft pump according to the present invention includes the discharge elbow of any of the above vertical shaft pumps.

  According to the vertical pump according to the present invention, since the discharge elbow of the vertical pump that is lighter than before is provided, the weight of the vertical pump can be reduced.

  According to the discharge elbow of the vertical shaft pump according to the present invention, there is an effect that it has sufficient resistance against internal pressure and discharge reaction force and can be reduced in weight.

It is a figure which shows the state in which the vertical pump which comprised the discharge elbow of the vertical pump which concerns on one Embodiment of this invention was installed. It is sectional drawing of the vertical shaft pump shown in FIG. It is a perspective view of the discharge elbow of the vertical shaft pump which concerns on one Embodiment of this invention.

Hereinafter, a discharge elbow of a vertical shaft pump according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.
1 is a view showing a state in which a vertical pump having a discharge elbow of a vertical pump according to the present embodiment is installed, FIG. 2 is a sectional view of the vertical pump shown in FIG. 1, and FIG. 3 is a vertical pump according to the present embodiment. It is a perspective view of this discharge elbow.

A discharge elbow (hereinafter referred to as “discharge elbow”) 2 of the vertical pump according to the present embodiment is applied to, for example, a vertical mixed flow pump 1 as shown in FIGS. 1 and 2.
The vertical shaft diagonal flow pump 1 includes a discharge elbow (discharge casing: discharge pipe) 2, a suspension pipe 3, a pumping pipe 4, a discharge bowl 5, and a suction bell 6.

  The discharge elbow 2 is made of, for example, duplex stainless steel, carbon steel such as SS400, or high strength steel, and fluid (for example, water) that flows along the vertical direction (longitudinal direction) flows therein. A flow path 7 (see FIG. 2) having a circular shape in a sectional view is provided to change the direction to the horizontal direction (lateral direction) (change the fluid flow direction by 90 degrees). In addition, a bearing box 9 that integrally supports the upper end of the main shaft (drive shaft) 8 and has a cylindrical appearance is integrally provided on the top (top) of the discharge elbow 2. The lower end 9 a of the bearing box 9 is connected to the outer peripheral surface of the discharge elbow 2 and is closed, and the upper end of the bearing box 9 is closed by a separate lid 10. A through hole 11 (see FIG. 2) is provided in the center of the lid body 10, and the main shaft 8 further extends upward in the vertical direction through the through hole 11. A shaft sealing device (for example, a gland packing) 12 (see FIG. 2) for sealing the main shaft 8 is attached to the through hole 11.

As shown in FIGS. 2 and 3, at least one sheet (three sheets in the present embodiment) is provided in each of the side portions of the discharge elbow 2 located in the central portion in the length direction of the flow path 7, that is, the curved portion. A (first) rib 13 is provided (standing). The ribs 13 are plate-like members made of, for example, duplex stainless steel, carbon steel such as SS400, or high strength steel. The ribs 13 are (substantially) parallel to each other and the lower end 9a of the bearing box 9 A portion (lower end) in contact with the side surface of the discharge elbow 2 is welded and joined so as to be substantially (substantially) orthogonal to the line (contour line) formed by, and project outward from the side surface of the discharge elbow 2.
As shown in FIG. 3, the bottom surface of the flange 14 to which the lid 10 is attached and the top surface of the base portion of the (first) cylindrical portion 15 extending in the horizontal direction toward the discharge port (exit) of the discharge elbow 2. Between the two, at least one (four in the present embodiment) (second) ribs 16 are provided (standing). The ribs 16 are plate-like members made of, for example, duplex stainless steel, carbon steel such as SS400, or high strength steel, and these ribs 16 extend radially along the radial direction of the flange 14 and are bearing housings. 9 extends across the line formed by the lower end 9a of the bearing 9 and protrudes outward from the front surface of the bearing housing 9 so that the bottom surface of the flange 14, the front surface of the bearing housing 9, and the top surface of the base portion of the cylindrical portion 15 are in contact with each other. It is welded.

As shown in FIG. 1, an upper shaft joint 17 is attached to the upper end portion of the main shaft 8 protruding upward from the lid body 10, and the upper end portion of the main shaft 8 protruding upward from the lid body 10 is Mounted on a rotary shaft 20 of a prime mover (for example, a motor) 19 mounted on a (first) support base (foundation: foundation) 18 and fixed via fastening members (for example, stud bolts and nuts) (not shown). The upper shaft coupling 17 is connected.
A pipe 22 is connected to the flange 21 provided at the discharge port of the discharge elbow 2.

As shown in FIG. 2, the suspension pipe 3 is a cylindrical member, and a flange 23 extending along the circumferential direction and extending radially outward is provided on the outer peripheral surface of the upper end portion. The lower surface of the flange 23 is placed on a (second) support base (base: base) 24 and is fixed to the support base 24 via fastening members (for example, stud bolts and nuts) 25. Further, the flange 23 and the suction port (inlet) of the discharge elbow 2, that is, the suction port of the (second) cylindrical portion 26 (see FIG. 3) extending in the vertical direction toward the suction port of the discharge elbow 2 are provided. The flange 27 is connected via a fastening member (not shown) (for example, a bolt and a nut).
On the other hand, a flange 28 that extends along the circumferential direction and extends outward in the radial direction is provided on the outer peripheral surface of the lower end portion of the suspension pipe 3.

  The pumping pipe 4 is a cylindrical member, and an upper end outer peripheral surface thereof is provided with a flange 29 along the circumferential direction and extending radially outward. A lower end outer peripheral surface thereof has a circumferential direction. , And a flange 30 extending radially outward is provided. The flange 29 and the flange 28 of the suspension pipe 3 are connected via a fastening member (for example, a bolt and a nut) 31.

  The discharge bowl 5 is a cylindrical member whose central portion in the length direction swells outward in the radial direction, and the outer peripheral surface of the upper end extends along the circumferential direction and extends outward in the radial direction. A flange 32 is provided, and a flange 33 extending along the circumferential direction and extending radially outward is provided on the outer peripheral surface of the lower end portion. The flange 32 and the flange 30 of the pumped-up pipe 4 are connected via a fastening member (not shown) (for example, a bolt and a nut). Further, the discharge bowl 5 accommodates a lower bearing (underwater bearing) 34 that supports and supports the lower end of the main shaft 8, and the inner peripheral surface of the discharge bowl 5 located radially outside the underwater bearing 34 includes: Guide vanes 35 are provided for rectifying the swirling flow into a linear flow.

An impeller (impeller) 36 is attached to a lower end portion (tip portion) of the main shaft 8 projecting downward from the underwater bearing 34, and the discharge bowl 5 and the suction bell are disposed on the radially outer side of the impeller 36. An impeller casing 37 that is disposed between the discharge bowl 5 and the suction bell 6 is provided.
The impeller casing 37 is a cylindrical member that is reduced in diameter (tapered) from the discharge bowl 5 side toward the suction bell 6 side. A flange 38 extending outward in the direction is provided, and a flange 39 extending along the circumferential direction and extending outward in the radial direction is provided on the outer peripheral surface of the lower end portion. The flange 38 and the flange 33 of the discharge bowl 5 are connected via a fastening member (not shown) (for example, a bolt and a nut).

  The suction bell 6 is a trumpet-shaped member that expands from the impeller casing 37 side toward the suction port side that opens downward (becomes thicker). A flange 40 is provided along the circumferential direction and extending outward in the radial direction. The flange 40 and the flange 39 of the impeller casing 37 are connected via a fastening member (not shown) (for example, a bolt and a nut).

The discharge elbow 2 is supported by the support base 24 via the flange 23, and the suspension pipe 3, the pumping pipe 4, the discharge bowl 5, the impeller casing 37, and the suction bell 6 are interposed via the flange 23. Thus, it is suspended from the support base 24. Further, the upper shaft joint 17, the main shaft 8, and the impeller 36 are suspended from the rotating shaft 20 of the prime mover 19 supported on the support base 18.
In addition, the code | symbols 41 and 42 in FIG. 2 are the intermediate shaft couplings which each connect the shaft protection pipe for sending cooling water to the lower bearing 34, and the main shaft 8 in the center.

According to the discharge elbow 2 according to the present embodiment, each side surface located in the curved portion of the flow path is (substantially) orthogonal to the contour line formed by the lower end 9a of the bearing box 9, and protrudes outward. Since the three ribs 13 are provided, a resistance against the internal pressure and the discharge reaction force can be effectively obtained.
Further, since the number of ribs is greatly reduced as compared with the conventional one, the weight of the discharge elbow 2 can be reduced.

  In addition, four ribs 16 are provided on the front surface of the bearing housing 9 so as to contact the upper surface of the root portion of the cylindrical portion 15 and project outward, thereby increasing resistance to internal pressure and discharge reaction force. Therefore, it is possible to cope with higher output of the vertical shaft mixed flow pump 1 without increasing the size of the discharge elbow 2.

Furthermore, when welding is performed on a conventional high-strength steel sheet of 490 MPa or higher, a softened part having a hardness lower than that of the base material part is formed at a position somewhat away from the melted and solidified weld line, and the weld joint strength becomes the base material. It is known to be lower than the material part.
That is, when welding is performed on such a steel sheet, the weld line that melts and congeals and the vicinity thereof are exposed to a high temperature of 800 ° C. or higher, and are rapidly cooled from the temperature range. Generated and harder than the base metal part, but on the contrary, the temperature at the time of welding is 700 ° C or less at a part away from the weld line, and tempering progresses in this temperature range, so it becomes softer than the base metal part To do.
If the present invention is used, even when an elbow is manufactured using such a steel material, the ribs 13 are provided across the softened portions generated on the left and right sides (both sides) of the weld line. can do.

  According to the vertical shaft mixed flow pump 1 according to the present invention, the discharge elbow 2 that is lighter than the conventional one is provided, so that the weight of the entire pump can be reduced.

The present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the gist of the present invention.
For example, the discharge elbow 2 according to the present invention can be applied not only to the vertical shaft diagonal flow pump 1 but also to a vertical shaft axial flow pump.

1 Vertical shaft mixed flow pump (vertical pump)
2 discharge elbow 7 flow path 8 spindle 9 bearing box 9a lower end 13 (first) rib 15 (first) cylindrical portion 16 (second) rib 26 (second) cylindrical portion

Claims (3)

A first cylindrical portion extending in the horizontal direction toward the discharge port and a second cylindrical portion extending in the vertical direction toward the suction port are provided, and the flowing direction of the fluid flowing along the vertical direction is horizontal. A discharge elbow of a vertical shaft in which a curved flow path that changes in direction is formed inside, and a bearing box that supports and supports the upper end of the main shaft of the vertical pump is integrally provided at the top,
At least one first rib is provided on both side surfaces located in the curved portion of the flow path so as to be substantially orthogonal to the contour line formed by the lower end of the bearing housing and project outward. Discharge elbow of a vertical shaft pump characterized by that.   The at least one 2nd rib which protrudes toward the outside while standing | contacting the upper surface of the base part of a said 1st cylindrical part at the front surface of the said bearing housing is erected. The discharge elbow of the vertical shaft pump according to 1.   A vertical pump comprising the discharge elbow of the vertical pump according to claim 1.

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