JP2987024B2 - Sheet metal pump casing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet metal pump casing, and more particularly to a pump casing having a partition wall for separating the inside of a sheet metal pump casing into a suction chamber and a hydro casing.

[0002]

2. Description of the Related Art Conventionally, a line pump having a pump casing formed by deep drawing a steel plate such as stainless steel by pressing is known. Next, a casing structure of a conventional line pump will be described with reference to FIGS. FIG. 10 is a longitudinal sectional view of the line pump, and FIG.
Is a bottom view of the line pump. As shown in FIGS. 10 and 11, the line pump 71 includes a casing 72 formed by press-forming a steel plate made of stainless steel or the like. As shown in FIG. 10, the inside of the casing 72 is separated into a suction chamber 74 and a hydrocasing chamber 75 by a partition plate 73, and an impeller 76 is provided in the hydrocasing chamber 75. The impeller 76 is fixed and supported at a free end of a main shaft 77 of the motor M, and a shaft sealing device 79 is provided between the main shaft 77 and the casing cover 78.

The casing 72 is provided with a suction port 80 communicating with the suction chamber 74 and a discharge port 81 communicating with the hydrocasing chamber 75. The suction port 80 and the discharge port 81 are provided with a suction flange 82 and a discharge flange 83, respectively.

[0004]

As described above, the suction port 80 and the discharge port 81 of the line pump 71 are connected to the main shaft 77.
, And at the opposite position on the same line. The pump casing has a hydro casing chamber 75 for accommodating an impeller 76 and a suction chamber 74 (suction passage) from the suction port 80 to the impeller inlet.
In the hydrocasing chamber 75, a flow path communicating with the discharge port 81 has a complicated shape such as a volute shape (see FIG. 9). Further, the suction chamber 74 also has a complicated shape as shown in FIGS. 8 and 9 from the positional relationship between the suction port 80 and the impeller entrance.

Accordingly, in the case of a line pump made of a press, a substantially elliptical casing 72 constituting a casing for a suction chamber is provided outside a partition plate 73 constituting a hydro casing chamber 75, and a partition plate constituting a hydro casing chamber 75 is provided. There is a problem that the joint between the suction chamber 73 and the suction chamber casing 72 is welded to have a double structure, or a suction channel in which a large number of other members having a complicated shape are welded to the partition plate is provided. was there.

The present invention has been made in view of the above circumstances, and an object of the present invention is to simplify press forming of a casing body by forming the casing body into a simple shape that is not affected by a hydrocasing chamber. Another object of the present invention is to provide a sheet metal pump casing in which a hydro casing chamber and a suction passage can be divided and formed only by a partition wall having a simple shape, the number of parts is small, and welding is easy.

[0007]

In order to achieve the above object, a sheet metal pump casing according to the present invention comprises a substantially cylindrical container-shaped sheet metal casing having a bottom on one side and an opening on the other side; A partition wall that separates the inside into a suction chamber and a hydrocasing chamber that houses the impeller; and a suction nozzle that is provided on a cylindrical side wall of the casing and communicates with the suction chamber .
The suction chamber and the hydrocasing chamber of the cylindrical side wall portion
And a cylindrical side wall of the casing.
A suction port for allowing the suction chamber and the suction nozzle to communicate with each other.
The feature is that a metal is formed . In addition,
Ming's sheet metal pump casing has a bottom on one side and an
A substantially cylindrical container-shaped sheet metal casing having a mouth,
Hydrocass for housing the suction chamber and impeller inside the casing
A partition wall for separating into a singing chamber and a cylinder of the casing;
A suction nozzle provided on the side wall portion and communicating with the suction chamber.
The discharge nozzle is provided on the cylindrical side wall of the casing.
Position facing the suction chamber and the hydro casing chamber
Provided on the cylindrical side wall of the casing.
Discharge port for communicating the casing chamber with the discharge nozzle
The feature is that a metal is formed.

[0008]

According to the present invention having the above-described structure, a substantially cylindrical container-shaped sheet metal casing having a bottom on one side and an opening on the other side is provided, and the interior of the casing is partitioned by a suction chamber and a hydrocasing chamber. Therefore, the casing has a simple shape that is not affected by the hydrocasing chamber, so that the casing can be easily formed. In addition, the hydrocasing chamber and the suction passage can be divided and formed only by the simple-shaped partition plate. Further, according to the present invention, since the press-made partition wall having poor rigidity is connected to the substantially cylindrical container-shaped casing, deformation of the partition wall due to internal pressure can be prevented.

Further, according to the present invention, the casing having a substantially cylindrical shape and the inner casing are separated from each other and are connected to each other via the elastic material. The deformation is absorbed by the elastic material and is not transmitted to the inner casing.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a sheet metal pump casing according to the present invention will be described below with reference to FIGS. FIG. 1 is a longitudinal sectional view of a line pump provided with a sheet metal pump casing of the present invention, and FIG. 2 is a bottom view thereof. As shown in FIGS. 1 and 2, the line pump 1 includes a casing 2 formed by press-forming a steel plate such as stainless steel. This casing 2 constitutes an outer casing, and has a bottom 2a on one side and a second side. It is formed in a substantially cylindrical container shape having an opening. The casing 2 is separated into a suction chamber 4 and a hydrocasing chamber 5 by a partition plate 3, and an impeller 6 is disposed in the hydrocasing chamber 5.
The impeller 6 is fixed and supported at a free end of a main shaft 7 of a motor (not shown).
The shaft sealing device 9 is provided between the two.

The partition plate 3 has an outer peripheral edge welded to the inner surface of the cylindrical side wall of the casing 2, and a center portion of the partition plate 3 extends toward the bottom 2 a of the casing 2. The tip of the cylindrical portion 3a is connected to the bottom 2a of the casing 2 by welding. And
A rectangular suction opening 3b is formed in the cylindrical portion 3a of the partition plate 3. A load due to the differential pressure between suction and discharge is applied to the partition plate 3, and the partition plate 3 needs to have strength and rigidity to withstand the load.
The strength and rigidity of the partition plate 3 are ensured by providing the partition plate 3 with a cylindrical portion 3a and joining the cylindrical portion 3a to the bottom 2a of the casing 2.

FIGS. 3 to 5 show details of the cylindrical portion 3a of the partition plate 3 having different shapes. 3 (a), FIG. 4 (a), FIG.
3 (a) is a sectional view, and FIGS. 3 (b), 4 (b) and 5 (b) are respectively III (b) -III in FIG. 3 (a).
FIG. 5B is a sectional view taken along the line, FIG. 4A is a sectional view taken along the line IV (b) -IV (b), and FIG. 5A is a sectional view taken along the line V (b) -V (b). FIG. 3 shows that the cylindrical portion 3a is provided with a rectangular hole so
This is an example in which b is formed. FIG. 4 shows an example in which a substantially U-shaped cut is provided in the cylindrical portion 3a, and the U-shaped portion 3c is bent inward to form the suction opening 3b. FIG. 5 shows an example in which a substantially U-shaped cut is provided in the cylindrical portion 3a, and the U-shaped portion 3c is bent outward to form the suction opening 3b.

As shown in FIGS. 3 to 5, since a plurality of suction openings 3b are uniformly formed on the outer peripheral portion of the cylindrical portion 3a, it is possible to level the direction of flow into the impeller inlet. In the examples shown in FIGS. 4 and 5, the U-shaped portion 3c serves as a guide plate, and a pre-swirl flow is generated by the guide plate to improve suction performance.

The casing 2 has a suction nozzle 10 and a discharge nozzle 1 at opposite positions of the cylindrical side wall.
1, a suction flange 15 and a discharge flange 16 are connected to the suction nozzle 10 and the discharge nozzle 11 via an intermediate ring 14, respectively.
That is, the intermediate ring 14 is made of the same material as the casing 2 such as stainless steel, and has the opening 14 a and the recess 14.
b and a male screw portion 14c, and a front end surface thereof forms a sealing surface 14s with a mating flange (not shown). Then, the suction nozzle 1 is inserted into the opening 14a of the intermediate ring 14.
0 small diameter portion 10b is joined by welding, the intermediate ring 1
4 constitute a spigot fitting portion.
The large diameter portion 10a of the suction nozzle 10 is fitted to 4b and is joined by welding. In addition, the discharge nozzle 11
The intermediate ring 14 is joined in exactly the same manner. A suction flange 15 and a discharge flange 16 are screwed and fixed to intermediate rings 14 and 14 of the suction nozzle 10 and the discharge nozzle 11, respectively. The suction flange 15 and the discharge flange 16 are non-wetted parts, and each is made of a material different from that of the casing body, for example, cast iron (F).
C) etc.

The suction nozzle 10 and the discharge nozzle 11
The suction port 17 is provided across the position corresponding to the suction chamber 4 and the hydrocasing chamber 5 in the casing 2, and communicates the suction chamber 4 and the suction nozzle 10 with the cylindrical side wall of the casing 2. Are formed, and a discharge port 18 for communicating the hydrocasing chamber 5 with the discharge nozzle 11 is formed. As shown in FIG. 6, the suction port 17 and the discharge port 18 are provided at positions opposite to each other with the partition plate 3 as a boundary. The suction port 17 is on the opposite side to the motor, the discharge port 18 is on the motor side, and the partition plate 3 is
Is formed in a semicircular shape or a shape similar to the semicircle centered on the vicinity of. In order to secure the opening areas of the suction port 17 and the discharge port 18, the inner diameter D _N of the large diameter portion of the nozzle portion / the pump diameter Φ ≧ 1.4 is set. Thus, the opening area of the suction port 17 and the discharge port 18 is equal to or larger than the diameter Φ.

On the other hand, an inner casing 19 is provided inside the casing 2, and the inner casing 19 is formed by deep drawing a single steel plate such as stainless steel by pressing. The inner casing 19 is composed of a cylindrical container-shaped main body 19a and a cylindrical suction side 19b extending from the main body 19a to the suction side. The opening-side end of the main body 19a of the inner casing 19 is
It is fitted and supported by the casing cover 8. The casing cover 8 is a motor-side bracket 2 made of a casting or the like.
Therefore, the inner casing 19 has high rigidity and is supported by the casing cover 8 having high rigidity. The tip of the suction side portion 19 b of the inner casing 19 extends to the vicinity of the partition plate 3. A seal member 21 made of an elastic material is interposed in a gap between the end of the suction side portion 19b of the inner casing 19 and the partition plate 3, and the seal member 21 allows the suction side (low pressure side) and the discharge side. (High pressure side) is sealed. In addition, the sealing member 2
1 is pushed to the suction side by the pressure difference between the high pressure side and the low pressure side, so that it can be reliably sealed without falling off.

A guide device 23 which forms a guide vane or volute is installed inside the main body 19a of the inner casing 19. The suction side portion 19b of the inner casing 19 forms a liner portion, and a slight clearance is formed between the suction side edge of the impeller 6 and the liner portion.

The operation of the line pump will be briefly described. The fluid sucked from the suction nozzle 10 flows into the suction chamber 4 through the suction port 17 of the casing 2.
The fluid is guided into the impeller 6 through the suction opening 3 b formed in the partition plate 3 and the suction side 19 b of the inner casing 19. The fluid discharged from the rotating impeller 6 is subjected to pressure recovery by the guide device 23, and the inner casing 1
9 flows into a space between the casing 2 and the inner casing 19 through an opening 19c formed in the main body 19a of the casing 9 and then discharges from a discharge port 18 formed in the casing 2 through a discharge nozzle 11 through a discharge nozzle 11 (not shown). It is discharged to the piping. The fluid flowing out of the inner casing 19 into the space between the casing 2 and the inner casing 19 is prevented from flowing into the suction side by the seal member 21.

In this embodiment, the bottom 2a is provided on one side,
A substantially cylindrical container-like casing 2 having an opening on the other side is provided, and the casing 2 is divided into a suction chamber 4 and a hydrocasing chamber 5 by a partition plate 3, so that the casing 2 has a simple shape which is not affected by the hydrocasing chamber. And the press forming of the casing 2 becomes easy,
The hydro casing chamber and the suction passage can be divided and formed only by the partition plate 3 having a simple shape.

In this embodiment, since the partition plate 3 made of a press having low rigidity is connected to the casing 2, the partition plate 3 can be prevented from being deformed due to the internal pressure.

Next, another embodiment of a sheet metal pump casing according to the present invention will be described with reference to FIG. FIG. 7 is a side view showing an installation type side-top (Side-Top) pump 25 including the sheet metal pump casing of the present invention.

In the present embodiment, a leg 26 is provided on the cylindrical side wall of the casing 2, and a suction nozzle 10 and a discharge nozzle 11 are provided at a distance of 90 ° from the leg 26, respectively. Since the sectional view taken along the line II of FIG. 7 is exactly the same as that of FIG. 1, the description of the internal structure is omitted.

Conventionally, as shown in FIG. 8 (a), an end-top (End-Top) provided with a suction nozzle extending horizontally (forward) from a front surface of a pump casing and a discharge nozzle extending vertically (upward). ) Type pumps are known. Such an end-top (pre-suction, top-discharge) type pump is provided with a suction nozzle 91 and a suction flange 92 extending forward in a press-formed cylindrical container-like pump casing 90 and a discharge nozzle 93 and a discharge flange extending upward. 94 are provided. The motor M is connected to the flange 90 a on the opening side of the casing 90.

[0024] For this end-top pump, since the discharge pipe must away from the motor length and overhaul space L by ₁ minute wall W, increases the minimum dimension L ₂ from the wall W to the discharge pipe That is, there is a problem that the pump cannot be installed at the corner and the pipe can be installed near the wall, so that space-saving installation is impossible.

[0025] Since the suction nozzle extends forwardly from the pump casing, becomes longer pump the total length L _3, there is a problem that is preventing the installation space also from this point.

However, when the installation type pump 25 having the sheet metal pump casing of the present invention is installed in the installation space, it can be installed as shown in FIG.

As apparent from FIG. 8 (b), according to the present embodiment, the suction nozzle 10 is provided on the cylindrical side wall of the cylindrical casing 2 and the discharge nozzle 1 is provided on the cylindrical side wall.
1, a so-called installation type side-top (Side-Top) pump can be formed, and the suction nozzle 10 extends in the horizontal direction from the cylindrical side wall of the cylindrical container-like casing 2, and for never suction nozzle extends forward, it requires only a small minimum dimension L ₂ from the wall W to the discharge pipe. That is, the pump can be installed at a corner (corner), and the suction pipe and the discharge pipe can be respectively installed near the wall,
Space-saving installation is possible.

Next, still another embodiment of the sheet metal pump casing according to the present invention will be described with reference to FIG. FIG. 9 is a cross-sectional view of an all-peripheral flow type double suction pump provided with the sheet metal pump casing of the present invention.

The all circumferential flow type double suction pump 30 shown in FIG.
Is provided with a canned motor 31 at the center, and impellers 33 and 34 having suction portions opened outward in the axial direction are fixed to both ends of a main shaft 32 of the canned motor 31, respectively. Substantially cylindrical container-like casings 35 and 36 for accommodating the impellers 33 and 34, respectively, are provided. The casings 35 and 36 are manufactured by press-forming a steel plate such as stainless steel. 37 are connected to each other. Casing 3
5 and pump outer shell 37 and casing 36 and pump outer shell 3
7 are fixed by loose flanges 38 and 39 which are rotatable in the circumferential direction, respectively.

The casings 35 and 36 have suction nozzles 35a and 36a, respectively.
a and 36a are connected by a header tube 40.
A suction portion 40a is formed at the center of the header tube 40, and a suction port 40b is opened in the suction portion 40a. A suction flange 41 is fixed to the suction portion 40a.

Inside the casings 35, 36, partition plates 45, 46 for separating the casings 35, 36 into a suction chamber 42 and a hydrocasing chamber 43, respectively, are fixed. The partition plates 45 and 46 are end plate portions 45a and 46a.
And cylindrical portions 45b, 46b.
6b are formed with suction openings 45c and 46c. The central portions of the partition plates 45, 46 are located at the bottom 3 of the casings 35, 36.
Cylindrical portions 45a, 46 extending toward 5b, 36b
The distal ends of the cylindrical portions 45a and 46a are connected to the bottom portions 35a and 36a of the casings 35 and 36 by welding.

Guide devices 48a, 49 constituting guide vanes or volutes are provided inside the partition plates 45, 46.
The inner casings 48 and 49 having a are provided.
The inner casings 48 and 49 have a spigot fitting portion, and the spigot fitting portion is fitted to the motor frames 56 and 57 of the canned motor 31. Inner casing 48, 49
Seal members 50, 51 are provided in the gaps between the partition members 45, 46.
Are respectively interposed, and the sealing members 50 and 51 are provided.
Thus, the suction side (low pressure side) and the discharge side (high pressure side) are sealed. Liner rings 52, 53 are provided at the inner ends of the inner casings 48, 49, respectively.

The motor frame 54 of the canned motor 31 has a substantially cylindrical frame outer shell 55, and frame side plates 56, 5 provided at both side openings of the frame outer shell 55.
7 is comprised. A plurality of ribs 55a are formed radially along the axial direction on the outer periphery of the frame outer trunk 55. The plurality of ribs 55a are formed integrally with the motor frame outer body 55 by press molding, and the outer surfaces of these ribs 55a are fitted to the inner peripheral surface of the pump outer body 37, and the plurality of ribs 55a Both are joined and integrated by spot welding or the like.

In the motor frame 54, a stator 58 and a rotor 59 are provided. The rotor 59 is supported by the main shaft 32, and a cylindrical can 60 is fitted inside the stator 58.

Bearing housings 61 and 62 are detachably provided on the frame side plates 56 and 57. The bearing housings 61 and 62 hold radial bearings 63 and 64, respectively. The shaft sleeve 65 fitted on the shaft 62 is rotatably supported, and the radial bearing 64 is rotatably supported on the shaft sleeve 66 fitted on the main shaft 62. The bearing housing 61, 62
And the motor frame side plates 56 and 57 are fixed by O-rings 67 and 68 made of an elastic material and a clearance fit.

An annular flow path 44 is provided between the pump outer body 37 and the motor frame 54 of the canned motor 31.
Is formed in the outer periphery of the pump outer body 37, and the discharge nozzle 69 is fixed to this opening. A discharge port 69a is opened in the discharge nozzle 69, and a discharge flange 70 is fixed.

Next, the operation of the all-circumferential flow type double suction pump configured as described above will be described. The fluid sucked from the suction port 40b branches right and left by the header pipe 40 and flows into the casings 35 and 36 from the suction nozzles 35a and 36a. Fluid flowing into the casings 35 and 36 is supplied to suction openings 45 c and 4 formed in the partition plates 45 and 46.
6c and guided into the impellers 33 and 34. Impeller 3
Fluids discharged from the guides 3 and 34 respectively
After the flow direction is changed from the centrifugal direction to the axial direction via the a and 49a, it flows into the flow path 44 formed between the pump outer body 37 and the motor frame 54 of the canned motor 31,
They merge while flowing through the flow path 44 and are discharged from the discharge port 69a through the discharge nozzle 69 from the opening 37a of the pump outer body 37.

In this embodiment, the bottom 35b,
The casing 36b is provided with casings 35, 36 in the form of substantially cylindrical containers having openings on the other side, and the insides of these casings 35, 36 are separated into the suction chamber 42 and the hydrocasing chamber 43 by the partition plates 45, 46. , 36
Has a simple shape that is not affected by the hydrocasing chamber 43, the press-forming of the casings 35 and 36 is facilitated, and the hydrocasing chamber 43 and the suction passage can be divided and formed only by the simple-shaped partition plates 45 and 46.

Further, in this embodiment, since the partition plates 45, 46 made of a press having low rigidity are connected to the casings 35, 36, deformation of the partition plates 45, 46 due to internal pressure can be prevented.

[0040]

As described above, according to the present invention, a substantially cylindrical container-like casing having a bottom on one side and an opening on the other side is provided, and the interior of this casing is partitioned by a suction wall and a hydrocasing chamber. Since the casing is divided into two, the casing has a simple shape that is not affected by the hydrocasing chamber, and press molding of the casing becomes extremely easy. Further, since the hydrocasing chamber and the suction passage can be divided and formed only by the partition wall, the number of parts is small, and the welding operation is extremely easy.

Further, according to the present invention, since the partition wall made of a press having low rigidity is connected to the casing having a substantially cylindrical shape, deformation of the partition wall due to internal pressure can be prevented.

Further, according to the present invention, since the suction nozzle and the discharge nozzle are attached across the partition wall, the shape of the partition wall is simplified, and press forming is facilitated.
By this partition wall, rigidity against a differential pressure between suction and discharge can be secured.

According to the present invention, since the suction nozzle and the discharge nozzle have different diameter nozzle structures, the area of the opening can be secured and the rigidity of the nozzle can be secured. Further, according to the present invention, the casing is divided into an outer casing and an inner casing, and a seal member made of an elastic material is interposed between the outer casing and the inner casing. The deformation is absorbed by the elastic material and is not transmitted to the inner casing.

Further, according to the present invention, a suction nozzle can be provided on the cylindrical side wall of the cylindrical container-shaped casing, and a discharge nozzle can be provided on the cylindrical side wall, so that a so-called side-top (Side-Top) can be provided. A mold pump can be configured. Therefore, the pump can be installed at the corner (corner) of the equipment space, and the suction and discharge pipes can be installed near the wall, so that space-saving installation is possible.

According to the present invention, the suction nozzle extends horizontally from the cylindrical side wall of the cylindrical casing, the discharge nozzle extends vertically from the cylindrical side wall, and the suction nozzle is provided in front of the casing. Because it does not extend,
The overall length of the pump can be shortened, and this also enables space-saving installation.

Further, according to the present invention, components other than the pump casing can be shared with the side-top pump and the line pump. In addition, the pump casing can be shared with the side-top type pump, the line type pump, and the double suction pump by providing the suction nozzle and the discharge nozzle (not necessary in the case of a double suction pump) by post-processing.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a sheet metal pump casing according to the present invention.

FIG. 2 is a bottom view of FIG.

FIG. 3 is a view showing details of a cylindrical portion of the partition plate of the embodiment shown in FIG. 1;

FIG. 4 is a view showing details of a cylindrical portion of the partition plate of the embodiment shown in FIG. 1;

FIG. 5 is a view showing details of a cylindrical portion of the partition plate of the embodiment shown in FIG. 1;

6 is a side view showing a suction port and a discharge port in the sheet metal pump casing according to the present invention, and FIG.
(A) is a view taken along the arrow VI (a) in FIG. 1, and FIG.
(B) It is an arrow view.

FIG. 7 is a side view showing another embodiment of the sheet metal pump casing according to the present invention.

FIG. 8 is an explanatory view showing the end-top type pump shown in FIG. 7 and a conventional side-top type pump.

FIG. 9 is a longitudinal sectional view showing still another embodiment of the sheet metal pump casing according to the present invention.

FIG. 10 is a longitudinal sectional view showing a conventional line pump.

FIG. 11 is a bottom view of FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Line pump 2,35,36 Casing 3,45,46 Partition plate 4,42 Suction chamber 5,43 Hydrocasing chamber 6,33,34 Impeller 7,32 Main shaft 8 Casing cover 9 Shaft sealing device 10,35a, 36a Suction nozzle 11, 69 Discharge nozzle 14 Intermediate ring 15, 41 Suction flange 16, 70 Discharge flange 17 Suction port 18 Discharge port 19, 48, 49 Inner casing 21, 50, 51 Seal member 23, 48a, 49a Guide device 31 Canned motor 40 header tube

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-129496 (JP, A) JP-A-62-195496 (JP, A) Fully open Showa 53-36102 (JP, U) Really open Showa 56- 85093 (JP, U) Shokai 1953-19802 (JP, U) Shokai Hei 3-82899 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F04D 29/40-29 / 56

Claims (5)

(57) [Claims] 1. A substantially cylindrical container-shaped sheet metal casing having a bottom on one side and an opening on the other side, and a partition wall for separating the inside of the casing into a suction chamber and a hydrocasing chamber containing an impeller. and a suction nozzle communicating with said suction chamber provided in the cylindrical side wall portion of the casing, the suction
The nozzle is connected to the suction chamber of the cylindrical side wall of the casing.
Provided at a position facing the hydro casing chamber,
The suction chamber and the suction nozzle are provided on the cylindrical side wall of the casing.
A pump casing made of sheet metal, characterized in that a suction port for communicating with the pump is formed . 2. A substantially circular shape having a bottom on one side and an opening on the other side.
A sheet metal casing in the shape of a cylindrical container;
Separate into a storage chamber and a hydrocasing chamber to accommodate the impeller
And a cylindrical wall provided on the cylindrical side wall of the casing.
Is the a suction nozzle for suction chamber communicating with, set only a discharge nozzle into a cylindrical sidewall portion and the suction chamber and a position facing said Hydro casing chamber of the casing, said Hydro cylindrical sidewall portion of said casing plate gold pump casing you characterized in that the formation of the discharge port that communicates with the casing chamber and the discharge nozzle. 3. At least one of the suction nozzle and the discharge nozzle is formed of a different diameter nozzle having a small diameter portion and a large diameter portion, and the suction port and the discharge port are located at positions facing each other with the partition wall as a boundary. The sheet metal pump casing according to claim 1 or 2 , wherein the pump casing has a semicircular diameter or a substantially semicircular diameter centered on the vicinity of the partition wall. 4. An inner casing which is provided in the casing in a state of being separated from the casing having a substantially cylindrical container shape and accommodates an impeller therein, and is interposed in a gap between the inner casing and the partition wall. provided and the seal member made of an elastic material, according to claim 1 or 2 sheet metal pump casing according mover side of the casing is characterized in that it is supported on the non-rotary part. The suction unit according to claim 5, wherein said partition wall, according to claim 1 or 2, characterized in that the formation of the guide portion causing the pre-rotation flow
The sheet metal pump casing as described in the above.