JP2003172285A - Casing fixing band for multi-stage pump and method for manufacturing casing fixing band - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a casing fixing band for a multi-stage pump which is excellent in a manufacturing cost and in an appearance. <P>SOLUTION: The casing fixing band for a multi-stage pump adopts a structure in which a round bar member 17 is molded to a flat plate-like shape, a screw shaft part 14 capable of being fixed to a suction casing 2 is formed on one end of the round bar member 17 and a flat plate-like L-shaped engagement seat 15 capable of being fixed to delivery casings 3a, 3b is formed on the other end. The respective parts of the fixing band is integrally formed only using one member of the round bar member 17 without requiring a fixing work of separate parts such as welding. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casing fixing band for a multistage pump used for fixing a pump casing in a multistage pump such as a deep well submersible pump and a method for manufacturing the casing fixing band.

[0002]

2. Description of the Related Art A pump section of a multistage pump typified by a deep well submersible pump is superposed with a plurality of intermediate casings containing impellers therein, and suction casings and discharge casings (both (Corresponding to the pump casing) is used. Then, by driving the respective impellers of the pump section connected in series by the output from the motor, the respective impellers can successively perform pumping while increasing the pressure.

For fixing the intermediate casing, suction casing, and discharge casing, a structure is used in which the stacked casings are fastened from both ends by a plurality of casing fixing bands.

The casing fixing band is axially arranged along the outer surface of the casing, one end of which is screwed to the suction casing, and the other end of which is screwed to the discharge casing, so that each casing is It is carried out so that it is sandwiched from the axial direction while being regulated so as not to shift the direction.

Conventionally, a band main body in which a threaded portion is formed at both ends of a round bar member has been used as a casing fixing band.

By the way, in deep well submersible pumps and the like, there is a demand to increase the outer diameter of the pump section as much as possible, and it is desired to suppress the dimension of the pump section protruding outward from the outer surface.

For this reason, the band body is not a round bar member having a large overhang, but a band-like plate member with a small overhang is used.

The band main body has a structure using three members, that is, an elongated strip plate member and a bolt member welded to the inner surface of each end of the strip plate member. In addition, conventionally, in the case of a flat strip-shaped plate material, there is also one in which the screw portion is separately welded and used.

[0009]

However, since the band body composed of these three members has a large number of parts and also has a structure in which separate parts are welded to each other, the number of man-hours is high and the manufacturing cost is high. There are difficulties. In addition, the welding has a drawback that the appearance of the casing fixing band is impaired because welding marks are left on the parts.

Therefore, the present invention provides a casing fixing band for a multi-stage pump, which is excellent in manufacturing cost and appearance, and a method for manufacturing the casing fixing band.

[0011]

According to a first aspect of the present invention, there is provided a casing fixing band for a multi-stage pump, wherein the band body is formed by forming one rod member into a flat plate shape, and at one end portion of the rod member, the end portion is formed. The first fixing part that can be fixed to the pump casing arranged on one side from the processing described above can be formed, and can be fixed to the pump casing arranged on the other side from the processing on the other end of the rod member at the other end. By adopting a structure in which a separate second fixing portion is formed, a flat member and a portion fixed to the pump casing are formed by only one member of the rod member, which does not require fixing work of a separate component such as welding. Was formed.

In the casing fixing band for a multi-stage pump according to a second aspect of the present invention, one end of one rod member is formed in a flat plate shape in the first fixing portion so that each portion can be formed more easily. A non-molded portion that is not molded is used, and a structure in which a screw portion is formed on the outer peripheral portion of the one end is used, and the other end of the flat bar member is L-shaped inwardly for the second fixing portion. A structure was used in which a fixing hole was formed in the flat plate-like portion of the bent end portion.

In the casing fixing band for a multi-stage pump according to a third aspect of the present invention, the male screw portion is further extended from the flat plate portion close to the base to the inside of the band body so as to prevent the male screw portion from protruding from the outer surface of the pump casing. Tilt and retract the entire male thread from the outer surface of the band body.

In the casing fixing band for a multi-stage pump according to a fourth aspect, a round bar member having a round cross section is used as the bar member so that the male screw portion can be easily processed.

According to a fifth aspect of the present invention, there is provided a method for manufacturing a casing fixing band for a multi-stage pump, wherein the band body is simply obtained from a bar member so as to obtain a product having a flat plate-shaped portion and a portion fixed to the pump casing. The first step of forming a threaded portion on one end portion of one round bar member to form a first fixing portion that can be fixed to the pump casing arranged on one side, and one end portion of the round bar member. A second step of shaping the removed portion into a flat plate shape, and an L-shaped bending process for bending the other end portion inward to the other end side formed into a flat plate shape and a hole processing, and a pump arranged on the other side The manufacturing is performed from the third step of forming the second fixing portion that can be fixed to the casing and the fourth step of bending the male screw portion from the root side to the inside.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on the first embodiment shown in FIGS.

FIG. 1 (a) shows a partial external view of a multistage pump, for example, a deep well submersible pump, in which 1 is a pump portion.

As shown in FIG. 2, the pump unit 1 includes an impeller 4 between a cylindrical suction casing 2 arranged at the lowermost stage and cylindrical discharge casings 3a and 3b arranged at the uppermost stage. Multiple substantially cylindrical intermediate casings 5
(Each corresponds to a pump casing) arranged in the axial direction. The casings (suction casing 2, intermediate casing 5, discharge casings 3a, 3b) that are stacked in multiple stages in the axial direction are fixed to a plurality of elongated casings that are spanned between the suction casing 2 and the discharge casings 3a, 3b. It is sandwiched by band 6. The casing fixing band 6 will be described later.

The suction casing 2 has an output shaft 7a (see FIG. 2).
The submersible motor 7 is attached with the upper part (only part of which is not shown) facing upward. The output shaft 7a of the submersible motor 7
Is connected to a rotary shaft 9 fixing each impeller 4 via a joint 8 and constitutes a main body of a deep well submersible pump. When the rotational force of the submersible motor 7 is transmitted to the rotary shaft 9 by this main body, each impeller 4 rotates and sucks fresh water in the well A from the suction port 10 formed in the suction casing 2, While increasing the pressure with the impeller 4, the discharge casing 3
The ink is discharged from the discharge port 11 formed in a. In addition, 10a shows a strainer attached to the suction port 10.

The appearance of the casing fixing band 6 used in this deep well submersible pump is shown in FIG. 2 (b). 3A to 3C show details of each part of the casing fixing band 6.

The elongated body 6a (band body) of the casing fixing band 6 has a plurality of stacked casings 2 and 3 in order to suppress the amount of protrusion from the outer surface of the casing.
a thin-walled flat plate-shaped portion 13 extending in the axial direction along the outer surfaces of a, 3b, and 5, and a suction casing fixing screw shaft portion 14 formed at one end of the flat-plate-shaped portion 13 (corresponding to the first fixing portion). )
And a discharge casing fixing locking seat 15 (corresponding to a second fixing portion) formed on the other end of the flat plate-shaped portion 13 are used in combination.

Such a flat plate type casing fixing band 6
The present invention is applied to. The main body 6a of the casing fixing band 6 is machined into a single rod member, for example, a single round rod member 17 having a round cross section as shown in FIG. A structure is used in which the flat plate portion 13, the screw shaft portion 14, and the locking seat 15 are formed in each portion. Specifically, in the main body 6a, one end of the round bar member 17 is defined as a non-molded portion that is not molded in a flat plate shape, and a screw portion 14a is molded on the outer peripheral portion of the one end portion to form the screw shaft portion 14. And a structure in which the round bar member portion other than the screw shaft portion 14 is crushed to form a thin flat plate-shaped portion 13, and the other end of the flat plate-shaped portion 13 is bent inwardly in an L-shape, and the bent end is formed. A bolt hole 18 (fixing hole) is formed in the flat plate-shaped portion 13a on the side to form a locking seat 15 in combination. That is, the whole body 6a is formed by one component such as one round bar member 17. In addition, the screw shaft portion 14 of the main body 6a is bent (inclined) inwardly, for example, in a dogleg shape, so that the flat plate-shaped portion near the root does not protrude outward from the outer surface of the flat plate-shaped portion 13 (main body 6a). , The whole of the screw shaft portion 14 is the flat plate portion 13
It is placed at a location that is sheltered from the outer surface of. 6b indicates a bent portion that bends in a dogleg shape.

In the method of molding (manufacturing) the main body 6a, first, as shown in FIGS. 4 (a) and 4 (b), for example, a threaded portion 14a is formed on the outer peripheral portion of one end of one round bar member 17. Is molded to form the screw shaft portion 14 at one end of the round bar member 17 (first step). Then, as shown in FIG. 4C, all the portions of the round bar member 17 other than the screw shaft portion 14 are crushed by press working to form a thin flat plate, and a long and slender body portion is formed. The flat plate portion 13 is formed (second step). Subsequently, as shown in FIG. 4D, the flat plate-shaped portion 1
Chamfer the corners of 3. Then, as shown in FIG. 4 (e), the end portion of the flat plate-shaped member 13 is perforated (third step), and the bolt hole 18 is formed in the end portion.

Next, as shown in FIG. 4 (f), the plate-like portion 6b near the root of the screw shaft portion 14 is bent inward so that the entire screw shaft portion 14 has the outer surface of the main body 6. It is arranged at a position retracted from (the outer surface of the flat plate portion 13) (fourth step).

Thereafter, as shown in FIG. 4 (g), the end of the flat plate portion 13 having the bolt hole 18 is bent into an L-shape to form an L-shaped locking seat 15 (first). 3 steps).

As a result, FIG. 2 (b) and FIG. 3 (a)-
As shown in (c), the main body 6a in which the screw shaft portion 14 to the locking seat 15 are formed in one piece, that is, the casing fixing band 6 is manufactured.

As shown in FIGS. 1 and 2, the casing fixing band 6 thus produced is used as the flat plate-shaped portion 1.
3 are arranged along the outer surfaces of the stacked suction casing 2, intermediate casing 5, and discharge casings 3a and 3b at a plurality of points in the casing circumferential direction, for example, at 3 to 4 points. Then, both ends of the casing fixing band 6 are fixed to the discharge casing 3a / the suction casing 2 (corresponding to the pump casings arranged on one side and the other side) arranged at the uppermost / lowermost side, and each casing is fixed. It is sandwiched so as not to slip. Specifically, for this fixing, as shown in FIGS. 1 and 2, the flange portion 3 of the discharge casing 3a which is arranged at the uppermost position is arranged.
The L-shaped locking seat 15 provided on the upper end of the flat plate-shaped portion 13 along the shoulder is locked to the shoulder portion of x. Further, in the through hole 19 of the flange portion 2b protruding from the opening end of the small diameter portion 2a in the lower portion of the suction casing 2 arranged closest to the bottom,
The screw shaft portion 14 at the lower end of the flat plate portion 13 is inserted. Then, the fixing bolt 20 is inserted from the bolt hole 18 of the locking seat 15 and screwed into the screw hole 3z in the wall portion of the discharge casing 3b through the bolt hole 3y of the flange portion 3x, and the locking seat 15 is discharged. , 3b (bolted). Further, a structure is used in which a nut 21 is screwed at the end of the screw shaft portion 14 penetrating the through hole 19 so that the casings are sandwiched from both sides. , It is fixed while being regulated from both the radial direction.

The round bar member 17 is formed into a flat plate shape,
By processing, the screw shaft portion 14 becomes a fixed portion at the end of the same member.
Since the casing fixing band 6 forming the locking seat 15 is entirely formed of only one member of the bar member, the number of parts and the number of working steps can be suppressed, and the manufacturing cost can be reduced. Moreover, since the structure is not attached by welding, no weld mark is produced on the product, a good appearance is ensured, and the casing fixing band 6 having a high product value can be obtained. In addition, since the casing fixing band 6 has the screw shaft portion 14 formed by using the end portion of the rod member and the locking seat 15 formed by using the end portion formed into a flat plate shape, each portion from the rod member is formed. Can be easily formed, and a product (fixed band 6) having the flat plate portion 13 and each portion fixed to the suction casing 2 and the discharge casing 3a can be easily obtained. In particular, when the round bar member 17 is used as the bar member, the male screw portion 14a can be easily processed, so that the screw shaft portion 14 can be formed easily. In addition, since the screw shaft portion 14 is prevented from protruding from the outer surface of the flat plate portion 13 by bending the flat plate portion near the root, the fixing portion of the casing fixing band 6 projects from the outer surface of the pump portion 1. I don't have to.

FIG. 5 shows a second embodiment of the present invention.

In this embodiment, the flat plate-like portion 13 of the casing fixing band 6 is not a flat shape as in the first embodiment, but is an arc shape following the outer diameter shape of the pump portion 1. is there. Even with such a fixing band 6, the same effect as that described in the first embodiment can be obtained. However, in the second embodiment, the same parts as those in the first embodiment described above are designated by the same reference numerals and the description thereof is omitted.

In the above-described embodiment, an example in which the threaded portion is formed at one end of the round bar member and then the flattened plate is pressed when the threaded shaft portion is machined is described. The present invention is not limited to this, and one end of the round bar member may be left and the round bar member may be processed into a flat plate shape, and then the threaded portion may be formed at the remaining one end. Also, when processing the locking seat,
An example was given in which a bolt hole was opened at the end formed into a flat plate shape, and then an L-shaped bending process was performed. However, the present invention is not limited to this, and an L-shaped bending process is performed at an end part formed into a flat plate shape. Since then
Bolt holes may be formed in the bent flat plate portion.

[0032]

As described above, claim 1 and claim 5
According to the invention, since the entire casing fixing band is formed by only one member such as the rod member, the number of parts and the number of work steps can be suppressed, and the manufacturing cost can be reduced. Moreover, since the separate component is not attached by welding, no weld mark is formed on the product, a good appearance is obtained, and a fixing band with high product value can be obtained.

According to the second aspect of the present invention, each fixing portion is formed by a structure in which the male screw portion formed at one end portion of the rod member and the flat plate-like end portion are bent into an L-shape. Therefore, there is an advantage that each part of the casing fixing band can be formed.

According to the third aspect of the present invention, by tilting the male screw portion so that it does not protrude from the outer surface of the casing fixing band, the casing fixing band that suppresses the amount of protrusion from the outer surface of the pump portion as much as possible. There is an advantage that the function of is not impaired.

According to the invention of claim 4, since the rod member is a round rod member, there is an advantage that the male screw portion can be easily formed.

[Brief description of drawings]

FIG. 1A is a perspective view showing a casing fixing band according to a first embodiment of the present invention together with an outer appearance of a multi-stage pump to which the casing fixing band is attached. (B) is a perspective view showing the case where the casing fixing band is removed from the multistage pump.

FIG. 2 is a cross-sectional view near the casing fixing band taken along the line AA in FIG.

FIG. 3A is a front view of the casing fixing band.
(B) is also a side view. Similarly, (c) is a plan view.

FIG. 4 is a view for explaining the manufacturing method of the casing fixing band.

FIG. 5A is a front view of a casing fixing band according to a second embodiment of the present invention. (B) is also a side view.
Similarly, (c) is a plan view.

[Explanation of symbols]

2, 3a, 3b, 5 ... Suction casing, discharge casing, intermediate casing (pump casing) 6 ... Casing fixing band 6a ... Main body (band body) 13 ... Flat plate portion 14 ... Screw shaft portion (first fixing portion) 15 ... Locking seat (second fixing part) 17 ... Round bar member.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Mitsuru Tamagawa             Aichi Prefecture Okazaki City Hashime Town Noriyota 1 Stock Association             Okazaki factory F-term (reference) 3H034 AA01 AA11 BB01 BB06 BB17                       CC03 DD13 DD16 DD22 DD30                       EE05 EE12

Claims (5)

[Claims] 1. An elongated band main body arranged in the axial direction along the outer surface of pump casings stacked in multiple stages,
A casing fixing band for a multistage pump, wherein one end of the band main body is fixed to a pump casing arranged on one side, and the other end of the band main body is fixed on a pump casing arranged on the other side, The band main body is formed by forming one rod member into a flat plate shape, and forming a first fixing portion at one end of the member that can be fixed to the pump casing arranged at the one side from the processing of the end, A casing fixing band for a multi-stage pump, characterized in that a second fixing portion is formed at the other end of the rod member so as to be fixed to the pump casing arranged closer to the other end by processing the end. 2. The first fixing portion, wherein one end of one rod member is a non-molded portion that is not molded into a flat plate, and a screw portion is formed on the outer peripheral portion of the one end. The second fixing portion is formed by bending the other end side of the rod member formed in the flat plate shape inwardly in an L shape and forming a fixing hole in the flat plate portion of the bent end portion. The casing fixing band for the multistage pump according to claim 1. 3. The male screw portion is tilted inward from the flat plate-shaped portion close to the base toward the inside of the band main body, and the entire male screw portion is retracted from the outer surface of the band main body. Casing fixing band for multi-stage pump. 4. The casing fixing band for a multi-stage pump according to claim 1, wherein the rod member is a round rod member having a round cross section. 5. A pump casing arranged axially along the outer surfaces of pump casings stacked in multiple stages, one end of which is fixed to the pump casing arranged on one side and the other end of which is arranged on the other side. A method of manufacturing a casing fixing band for a multi-stage pump having an elongated band body fixed to the above, wherein the band body has a threaded portion formed at one end of one round bar member, First fixable to the arranged pump casing
A first step of forming a fixed portion, a second step of forming a portion of the round bar member excluding one end portion into a flat plate shape, and a second end portion of the round bar member that is formed into a flat plate shape and is bent inward at the other end portion. A third step of performing an L-shaped bending process and a drilling process to form a second fixing part that can be fixed to the pump casing arranged on the other side, and the male screw part from the root side to the inside. A method of manufacturing a casing fixing band for a multi-stage pump, the method comprising: a fourth step of bending.