Pump bracket and manufacturing method of the same

Abstract

To provide a pump bracket which can be manufactured in a short time at low costs without newly producing a casting mold of the bracket when a space between a motor part and a pump part of a motor pump is changed, and to provide a manufacturing method of the pump bracket.SOLUTION: A pump bracket connects a motor part and a pump part of a motor pump with each other and includes: a motor flange attached to the motor part; a pump flange attached to the pump part; and an intermediate member connected between the motor flange and the pump flange. The motor flange includes: a first cylinder part having a cylindrical shape; and a motor partition wall part having a first through hole. The motor flange is an integrally molded cast product. The pump flange has a second cylinder part having a cylindrical shape and a pump partition wall part having a second through hole. The pump flange is an integrally molded cast product. The intermediate member is welded at one end to the motor flange and at the other end to the pump flange.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a pump bracket that connects a motor section and a pump section of a motor pump, and a method for manufacturing the pump bracket. [Background technology]

[0002] Conventional motor pumps use a bracket as a member connecting the motor and pump parts of the motor pump. Patent Document 1 discloses a motor pump bracket in which the motor bracket and the pump bracket, which were previously separate structures, are integrally molded. The bracket in Patent Document 1 is manufactured using lost-wax casting.

[0003] By integrally molding the motor bracket and the pump bracket, the bracket can be shortened in the axial direction, and the overall axial length of the motor pump can also be shortened. However, motor pumps require a variety of configurations depending on various conditions. For example, depending on the relative positions of the suction port and discharge port, a motor pump may be required in which the distance between the pump and motor is widened, or in which the distance between the pump and motor is varied depending on the conditions. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2023-127235 Summary of the Invention [Problem to be solved by the invention]

[0005] If a bracket is manufactured by integrating the motor bracket and the pump bracket, and then a motor pump with a different spacing between the motor and pump is required, a new mold must be created to manufacture the bracket. However, creating a new mold is time-consuming and costly.

[0006] The present invention aims to provide a pump bracket for a motor pump and a method for manufacturing the pump bracket, which can be manufactured in a short period of time and at low cost when changing the distance between the motor section and the pump section of the motor pump without having to create a new mold for the bracket. [Means for solving the problem]

[0007] A pump bracket according to a first aspect of the present invention is a pump bracket that connects a motor section and a pump section of a motor pump, and includes: a motor flange attached to the motor section; a pump flange attached to the pump section; and an intermediate member connected between the motor flange and the pump flange. The motor flange has a cylindrical first cylindrical portion extending in the axial direction of a rotary shaft of the motor pump; and a motor partition wall portion extending radially inward from the first cylindrical portion and having a first through hole through which the rotary shaft can be inserted. The motor flange is an integrally molded casting. The pump flange has a cylindrical second cylindrical portion extending in the axial direction of the rotary shaft; and a pump partition wall portion extending radially inward from the second cylindrical portion and having a second through hole through which the rotary shaft can be inserted. The pump flange is an integrally molded casting. One end of the pipe is welded to the motor flange, and the other end is welded to the pump flange.

[0008] With a pump bracket having such a configuration, new motor pumps with different spacing between the motor and pump sections can be manufactured in a short period of time and at low cost simply by preparing pipes of different lengths depending on the conditions of the motor pump.

[0009] In the pump bracket according to the second aspect of the present invention, the motor flange and the pump flange are each a lost-wax casting.

[0010] In the pump bracket according to the third aspect of the present invention, a fitting portion that fits into each other is formed on the surface of the motor partition wall portion facing the pipe and on the end of the pipe.

[0011] In the pump bracket according to a fourth aspect of the present invention, a fitting portion that fits into each other is formed on the surface of the pump partition wall portion facing the pipe and on the end of the pipe.

[0012] A fifth aspect of the present invention relates to a method for manufacturing a pump bracket, which is the same as the first aspect, and includes a mold preparation process for preparing lost-wax molds for the motor flange and the pump flange, a casting process for pouring molten metal into the lost-wax molds for the motor flange and the pump flange to cast the motor flange and the pump flange, a pipe processing process for processing a pipe to a predetermined length, and a welding process for welding one end of the pipe to the cast motor flange and the other end of the pipe to the cast pump flange.

[0013] According to a manufacturing method for a pump bracket having such a configuration, when manufacturing a new pump bracket with a different distance between the motor section and the pump section, the mold manufacturing process can be omitted for the motor flange and pump flange, thereby achieving the effect of enabling motor pumps of different heights to be manufactured in a short period of time and at low cost. [Effects of the Invention]

[0014] According to the present invention, when the distance between the motor portion and the pump portion of the motor pump is changed, it is not necessary to create a new mold for the bracket, and it can be manufactured in a short period of time and at low cost. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a cross-sectional view of a pump bracket according to an embodiment of the present invention. [Figure 2] FIG. 2 is a partial cross-sectional view of the motor pump. [Figure 3] FIG. 2 is a plan view of the motor flange. [Figure 4] FIG. 2 is a bottom view of the motor flange. [Figure 5] FIG. 2 is a plan view of the pump flange. [Figure 6] FIG. 10 is a bottom view of the pump flange. [Figure 7] FIG. 4 is a partially enlarged view of a fitting portion between the motor flange and the pipe. [Figure 8] FIG. 4 is a partially enlarged view of a fitting portion between a pump flange and a pipe. [Figure 9] 4 is a flowchart showing steps of a method for manufacturing a pump bracket according to an embodiment of the present invention. [Figure 10] 10 is a flowchart showing a mold manufacturing process among the steps of a method for manufacturing a pump bracket according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] A pump bracket 1 and a manufacturing method for the pump bracket 1 according to an embodiment of the present invention will be described below with reference to the drawings. As shown in Fig. 1, the pump bracket 1 of this embodiment includes a motor flange 2, a pump flange 3, and a pipe 4 that is an intermediate member welded at one end to the motor flange 2 and at the other end to the pump flange 3. As shown in Fig. 2, the pump bracket 1 of this embodiment connects a motor section 11 and a pump section 12 of a motor pump 10.

[0017] The motor flange 2 has a first cylindrical portion 21, a motor partition wall portion 22, a first flange portion 23, and a second flange portion 24. The first cylindrical portion 21, the motor partition wall portion 22, the first flange portion 23, and the second flange portion 24 are integrally molded by lost-wax casting, and the motor flange 2 is a lost-wax cast product.

[0018] The first cylindrical portion 21 has a cylindrical shape extending in the direction of the axis N of the rotating shaft 111 of the motor pump 10. The first cylindrical portion 21 has four approximately rectangular openings 21a formed at equal intervals in the circumferential direction on the pump portion 12 side. An outer fitting portion 21b that fits externally with an inner fitting portion formed on the motor portion 11 is formed on the inner surface of the end of the first cylindrical portion 21 on the motor portion 11 side. The motor partition wall portion 22 extends radially inward from the end of the first cylindrical portion 21 on the pipe 4 side to near the rotating shaft 111. A first through hole 22a, through which the rotating shaft 111 is inserted, is formed in the center of the motor partition wall portion 22. An inner fitting portion 22b into which the end of the pipe 4 is externally fitted is formed on the motor partition wall portion 22 on the pipe 4 side. A seal retaining portion 22c is formed on the motor section 11 side of the motor partition wall portion 22 to retain an oil seal 13 that seals around the rotating shaft 111 of the motor section 11. In this embodiment, the end of the pipe 4 serves as the outer fitting portion, and the pipe 4 side of the motor partition wall portion 22 serves as the inner fitting portion, but the end of the pipe 4 may serve as the inner fitting portion, and the pipe 4 side of the motor partition wall portion 22 may serve as the outer fitting portion.

[0019] As shown in FIG. 3 , the first flange portion 23 extends radially outward from the end of the first tubular portion 21 facing the motor unit 11 and has a rectangular outer shape. The outer shape of the first flange portion 23 is not limited to a rectangular shape and may be any shape that matches the shape of the portion of the motor unit 11 to which the motor flange 2 is attached, including a circular shape. A through-hole 23a is formed at each of the four corners of the first flange portion 23. The through-holes 23a are used to fasten the motor flange 2 to the motor unit 11 with bolts. As shown in FIG. 4 , the second flange portion 24 extends radially outward from the end of the first tubular portion 21 facing the pipe 4 and has an annular shape. Eight through-holes 24a are formed at equal intervals around the circumference of the second flange portion 24. An annular groove 24b for an O-ring is formed on the surface of the second flange portion 24 facing the pipe 4. Note that an O-ring may not be used. In such a case, a flat packing or the like may be used. The through-hole 24a and the annular groove 24b are used when the motor pump 10 is installed in a housing or the like that contains the liquid to be sucked.

[0020] 1, the pump flange 3 has a second cylindrical portion 31, a pump partition wall portion 32, and a connecting portion 33. The second cylindrical portion 31, the pump partition wall portion 32, and the connecting portion 33 are integrally formed by lost-wax casting, and the pump flange 3 is a lost-wax cast product.

[0021] The second cylindrical portion 31 has a cylindrical shape extending in the direction of the axis N of the rotary shaft 111 of the motor pump 10, and has a tapered shape from the portion joined to the pipe 4 toward the motor section 11. As shown in FIG. 5 , the second cylindrical portion 31 has four substantially rectangular openings 31a equally spaced circumferentially. In this embodiment, the space between adjacent openings 31a forms the side wall of the second cylindrical portion 31. Partition walls 34 are formed at two opposing locations on the inner surface of the side wall of the second cylindrical portion 31, extending from the inner surface to the vicinity of the rotary shaft 111. The openings 31a function as suction ports of the motor pump 10, and liquid flowing in from the openings 31a is guided to the pump section 12 by the partition walls 34.

[0022] The pump partition wall portion 32 extends radially inward from the end of the second cylindrical portion 31 on the motor portion 11 side to the vicinity of the rotating shaft 111. A second through-hole 32a, through which the rotating shaft 111 is inserted, is provided in the center of the pump partition wall portion 32. An inner fitting portion 32b into which the end of the pipe 4 is externally fitted is formed on the pipe 4 side of the pump partition wall portion 32. The inner fitting portion 32b is inserted into the pipe 4. Note that in this embodiment, the end of the pipe 4 serves as the outer fitting portion, and the pipe 4 side of the pump partition wall portion 32 serves as the inner fitting portion; however, the end of the pipe 4 may serve as the inner fitting portion, and the pipe 4 side of the pump partition wall portion 32 may serve as the outer fitting portion.

[0023] The connecting portion 33 is located at the end of the second cylindrical portion 31 on the pump portion 12 side, and has a cylindrical cylindrical portion 33a with a step on its inner circumferential surface, and a flange portion 33b protruding radially outward from the outer circumferential surface of the cylindrical portion 33a. As shown in Fig. 6, four flange portions 33b are formed at equal intervals in the circumferential direction, and each flange portion 33b has a through hole 33c formed therein.

[0024] In this embodiment, the pipe 4 is a standardized cylindrical stainless steel product that is processed. The pipe 4 is cut to the required length to match the spacing between the motor section 11 and the pump section 12, which is determined depending on the operating conditions of the motor pump 10 for which the pump bracket 1 is used. Even if a motor pump 10 with a different spacing between the motor section 11 and the pump section 12 is required, the pump bracket 1 of this embodiment can be used without changing the configuration of the motor flange 2 and the pump flange 3, simply by changing the length to which the standardized pipe is cut. The length l of the pipe 4 is not particularly limited, but it is often manufactured to be 72% or more of the overall length L of the pump bracket 1.

[0025] As shown in Figures 7 and 8, both ends of the pipe 4 are externally fitted into the internal fitting portions 22b, 32b of the motor flange 2 and the pump flange 3, and the tip surfaces of the pipe 4 are welded to the motor flange 2 and the pump flange 3 with the tip surfaces abutting against the abutment surfaces 25, 35 formed on the motor flange 2 and the pump flange 3.

[0026] The pipe 4 has four circular openings 42 formed near both ends, spaced equally apart in the circumferential direction. In this embodiment, the positions of the openings 42 are determined by the positions of the lowest and highest liquid levels of the liquid sucked and discharged by the motor pump 10. The positions of the openings 42 are determined so that the opening 42 on the motor flange 2 side is higher than the highest liquid level of the liquid that is the target of the motor pump 10, and so that the opening 42 on the pump flange 3 side is at the same height as the lowest liquid level. Thus, in this embodiment, the length and positions of the openings 42 of the pipe 4 are determined by the conditions under which the motor pump 10 will be used, but because standard pipes are used, these can be easily changed.

[0027] Next, a motor pump 10 using the pump bracket 1 of this embodiment will be described. As shown in Fig. 2, the motor pump 10 includes a motor section 11, a pump bracket 1, and a pump section 12. The motor section 11 and the pump section 12 are connected to each other by the pump bracket 1. The motor section 11 is attached to the upper end of a motor flange 2 of the pump bracket 1, and the pump section 12 is attached to the lower end of a pump flange 3.

[0028] The motor section 11 has a rotating shaft 111, a casing 112, a stator 113, a rotor 114, an external fan 115, a bracket 116, and a terminal box 117. The rotating shaft 111 is rotatably supported by the casing 112 via a first bearing 118 and a second bearing 119. The first bearing 118 is held by the bracket 116. The rotating shaft 111 is inserted into the first through-hole 22a of the motor flange 2, extends through the pipe 4, and is inserted into the second through-hole 32a of the pump flange 3. An impeller 122 of the pump section 12 is attached to the end of the rotating shaft 111. When the rotating shaft 111 rotates, the impeller 122 rotates.

[0029] The bracket 116 of the motor unit 11 is fixed to the motor flange 2 of the pump bracket 1. The bottom surface of the bracket 116 is generally rectangular. When fixing the bracket 116 to the motor flange 2, first, the first flange portion 23 of the motor flange 2 is fitted onto the bottom surface of the bracket 116. Then, the first flange portion 23 and the bracket 116 are fixed to each other with bolts inserted into the through holes 23a of the first flange portion 23 and the bracket 116. As a result, the pump bracket 1 is fixed to the motor unit 11.

[0030] The pump section 12 is a multi-stage pump in which multiple impellers 122 are arranged in the direction of the axis N inside a casing 121. The pump section 12 has a discharge bracket 123 on which the casing 121, the impellers 122, etc. are formed. In this embodiment, the pump section 12 uses the opening 31a of the pump flange 3 of the pump bracket 1 as a suction port.

[0031] A flange 123a with a through hole protrudes from the outer surface of the discharge bracket 123. When fixing the pump bracket 1 to the pump section 12, first, the upper end of the casing 121 of the pump section 12 is fitted into the pump flange 3 of the pump bracket 1. Then, bolts are inserted through the through holes formed in the flange 123a of the discharge bracket 123 and through holes 33c formed in the flange section 33b of the connection section 33, and the bolts and nuts are tightened to fix the pump bracket 1 to the pump section 12.

[0032] In this way, connecting the motor section 11 and the pump section 12 with the pump bracket 1 completes the motor pump 10. When the completed motor pump 10 is to be used to pump liquid, the motor pump 10 is installed in a predetermined location so that the pump section 12 is submerged in the liquid to be sucked in.

[0033] 2 is installed relative to a housing 100 containing a liquid to be pumped. A through hole 24a for inserting a bolt is formed in the second flange portion 24 of the pump bracket 1, and the second flange portion 24 is fastened to a top plate portion 101 of the housing 100 by a bolt inserted into the through hole 24a. An O-ring is fitted in the annular groove 24b of the second flange portion 24, thereby sealing the gap between the pump bracket 1 and the housing 100.

[0034] When the motor pump 10 is operated, the rotating shaft 111 rotates, causing the impeller 122 to rotate, sucking in liquid from the opening 31a and causing it to flow downward within the pump section 12, and then discharging the liquid from the discharge port 124 provided in the discharge bracket 123.

[0035] The configuration of the motor section 11 and pump section 12 of the motor pump 10 that uses the pump bracket 1 of this embodiment is not particularly limited, and various configurations can be used depending on the application of the motor pump 10. Furthermore, the shapes of the motor flange 2 and pump flange 3 of the pump bracket 1 can also be changed as appropriate depending on the configuration of the motor section 11 and pump section 12.

[0036] Next, a manufacturing method of the pump bracket 1 of this embodiment will be described with reference to the drawings. As shown in FIG. 9 , the manufacturing method of the pump bracket 1 of this embodiment includes a mold preparation step ST1 in which lost-wax molds for the motor flange 2 and the pump flange 3 are prepared, respectively; a casting step ST2 in which molten metal is poured into the lost-wax molds for the motor flange 2 and the pump flange 3 to cast the motor flange 2 and the pump flange 3; a flange processing step ST3 for the motor flange 2 and the pump flange 3; a pipe processing step ST4 for the pipe 4; and a welding step ST5 in which the pipe 4 is welded to the motor flange 2 and the pump flange 3. Since a lost-wax mold can be reused once it is prepared, the mold preparation step ST1 of the above steps ST1 to ST5 can be omitted if a lost-wax mold has already been prepared. Furthermore, the flange processing step ST3 and the pipe processing step ST4 may be performed in reverse order or simultaneously.

[0037] As shown in Figure 10, the mold preparation process ST1 includes a wax pattern preparation process ST11 in which a wax pattern of the motor flange 2 and a wax pattern of the pump flange 3 are prepared, respectively; a dipping process ST12 in which slurry is applied to the wax patterns of the motor flange 2 and the pump flange 3, respectively; a sand application process ST13 in which refractory powder is applied to the surfaces of the wax patterns of the motor flange 2 and the pump flange 3 to which the slurry has been applied, respectively; and a firing and dewaxing process ST14 in which the refractory powder is fired and the wax patterns of the motor flange 2 and the pump flange 3 to which the refractory powder has been applied are dewaxed.

[0038] In the flange machining step ST3 of the motor flange 2 and the pump flange 3, the pipe 4 sides of the cast motor flange 2 and the pump flange 3 are machined to form inner fitting portions 22b, 32b with a predetermined tolerance.

[0039] In the pipe processing step ST4, a standard stainless steel pipe is prepared and cut to the specified length required for the pump bracket 1. In this embodiment, a pipe with a thickness of 3 mm and a diameter of 88 mm is prepared. Then, after cutting to the specified length, the pipe 4 is machined to form fitting portions 41 with a specified tolerance on the inner periphery of both ends of the pipe 4. Furthermore, processing is performed to form multiple openings 42 near both ends of the pipe 4. In this embodiment, four openings 42 are formed at equal intervals on each end of the pipe 4. The positions of the openings 42 are set so that one opening 42 of the pipe 4 is higher than the highest liquid level of the liquid to be pumped by the motor pump 10, and the other opening 42 is at the same height as the lowest liquid level.

[0040] The welding process ST5 includes a motor flange welding process in which a motor flange 2 is attached to one end of a pipe 4 that has been subjected to a predetermined process and the pipe 4 is welded to the motor flange 2, and a pump flange welding process in which a pump flange 3 is attached to the other end of the pipe 4 and the pipe 4 is welded to the pump flange 3. In this embodiment, TIG welding is used to weld the pipe 4 to the motor flange 2 and the pipe 4 to the pump flange 3. The welds 5 to be TIG welded are four locations evenly spaced around the circumference of the pipe 4. In this embodiment, the welds 5 are 20 mm wide and 4 mm high for a pipe 4 that is 3 mm thick and 88 mm in diameter. The number, width, and height of the welds 5 are not limited to those in this embodiment and can be changed as appropriate depending on the size of the pipe 4, etc.

[0041] The motor flange welding process begins by fitting the inner fitting portion 22b of the motor partition wall portion 22 of the motor flange 2 into one end of the pipe 4, and abutting one end face of the pipe 4 against the abutment surface 25 of the motor flange 2. In this way, the motor flange 2 and the pipe 4 are accurately positioned. After positioning, the portion where the outer circumferential surface of the pipe 4 and the motor flange 2 abut is TIG welded at four equally spaced locations circumferentially around the outer circumferential surface of the pipe 4, forming welds 5 and joining the pipe 4 and the motor flange 2.

[0042] The pump flange welding process begins by fitting the inner fitting portion 32b of the pump flange 3 into the other end of the pipe 4, and abutting the other end surface of the pipe 4 against the abutment surface 35 of the pump flange 3. In this way, the pump flange 3 and the pipe 4 are accurately positioned. After positioning, the portion where the outer circumferential surface of the pipe 4 and the pump flange 3 abut is welded by TIG welding at four equally spaced locations circumferentially around the outer circumferential surface of the pipe 4, forming welds 5 and joining the pipe 4 and the pump flange 3. The order of the motor flange welding process and the pump flange welding process is not limited to the above. Furthermore, post-weld distortion may be removed by finishing the pump flange 3 after the welding process. In this way, the pump bracket 1 is completed when welding process ST5, which welds the pipe 4 to the motor flange 2 and the pump flange 3 through the motor flange welding process and the pump flange welding process, is completed.

[0043] In the pump bracket 1 of this embodiment, the pipes 4 are fixed by welding to the cast motor flange 2 and pump flange 3, so by preparing pipes 4 of different lengths, it is possible to manufacture pump brackets 1 that correspond to motor pumps 10 with different intervals between the motor section 11 and the pump section 12. Furthermore, because the pump bracket 1 includes the pipes 4, it can be made lighter than conventional brackets that are entirely cast.

[0044] In the manufacturing method of the pump bracket 1 of this embodiment, a pipe is processed and used as the pipe 4, and the pipe 4 is welded to the motor flange 2 and the pump flange 3. Therefore, if a new pump bracket with a different spacing between the motor portion 11 and the pump portion 12 is needed, a pipe 4 of a different length can be prepared and the new pump bracket can be manufactured. In this case, the mold fabrication step ST1 is omitted, and the motor flange 2 and the pump flange 3 are cast in the casting step ST2 using a lost-wax mold for the motor flange 2 and the pump flange 3 that have already been created. The pipe fabrication step ST4 can be achieved simply by changing the length of the cut standard pipe. No particular changes are required for the welding step ST5. Thus, the manufacturing method of the pump bracket 1 of this embodiment omits the time-consuming and costly mold fabrication step ST1 when manufacturing a new pump bracket 1 with a different spacing between the motor portion 11 and the pump portion 12, thereby enabling the new pump bracket 1 to be manufactured quickly and at low cost. Furthermore, pump brackets 1 of various heights can also be manufactured quickly and at low cost. [Industrial Applicability]

[0045] The present invention can be applied to, for example, a pump bracket that connects a motor section and a pump section of a motor pump to each other, and a method for manufacturing the pump bracket. [Explanation of symbols]

[0046] 1 Pump bracket 2 Motor flange 21 First cylinder part 21a opening 21b External fitting part 22 Motor partition wall 22a 1st through hole 22b Inner fitting part 22c Seal retainer 23 First flange 23a Through hole 24 Second flange 24a through hole 24b Circular groove 25 Contact surface 3 Pump flange 31 Second cylinder part 31a aperture 32 Pump partition wall 32a 2nd through hole 32b Inner fitting part 33 Connection 33a Cylinder part 33b Flange 33c through hole 34 Bulkhead 35 Contact surface 4 Pipes 41 Fitting part 42 Aperture 5 Welded parts 10 Motor pump 11 Motor section 111 Rotation axis 112 Casing 113 Stator 114 Rotor 115 External Fan 116 Bracket 117 Terminal box 118 First bearing 119 Second bearing 12 Pump section 121 Casing 122 Impeller 123 Discharge bracket 124 Discharge port 13 Oil seal 100 cabinets 101 Top plate

Claims

1. A pump bracket that connects a motor portion and a pump portion of a motor pump, a motor flange attached to the motor section; a pump flange attached to the pump section; an intermediate member connected between the motor flange and the pump flange, the motor flange has a cylindrical first cylindrical portion extending in the axial direction of the rotary shaft of the motor pump, and a motor partition wall portion extending radially inward from the first cylindrical portion and having a first through hole through which the rotary shaft can be inserted, the motor flange being an integrally molded casting, the pump flange includes a second cylindrical portion extending in the axial direction of the rotary shaft, and a pump partition wall portion extending radially inward from the second cylindrical portion and having a second through hole through which the rotary shaft can be inserted, the pump flange being an integrally molded casting, The pump bracket is characterized in that the intermediate member is a pipe having one end welded to the motor flange and the other end welded to the pump flange.

2. 2. The pump bracket according to claim 1, wherein the motor flange and the pump flange are each a lost-wax casting.

3. 3. The pump bracket according to claim 1, wherein a mating portion is formed on the surface of the motor partition wall portion facing the pipe and on an end of the pipe, so that the mating portions fit together.

4. 3. The pump bracket according to claim 1, wherein a fitting portion is formed on a surface of the pump partition wall portion facing the pipe and on an end of the pipe, the fitting portion fitting together with the surface of the pump partition wall portion facing the pipe and an end of the pipe.

5. A method for manufacturing a pump bracket according to claim 1, comprising the steps of: a mold making step of making lost-wax molds for the motor flange and the pump flange; a casting step of pouring molten metal into the lost wax molds for the motor flange and the pump flange, respectively, to cast the motor flange and the pump flange; a pipe processing step of processing the pipe to a predetermined length; a welding step of fixing one end of the pipe to the cast motor flange by welding, and fixing the other end of the pipe to the cast pump flange by welding.

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