JPH07109990A - Full round flow motor pump - Google Patents

Abstract

PURPOSE:To provide a full round flow motor pump in which a motor frame outer barrel is fixed to an outer cylinder by designing required parts such as a water extracting pipe, an air extracting pipe or a gauge piping pipe without providing separate members. CONSTITUTION:A pump assembly is provided with a motor frame outer barrel 14 arranged on an outer periphery of a stator of a motor, an outer cylinder 2 which forms a circular space in respect to the outer periphery of the motor frame outer barrel 14, and a pump which introduces liquid into the circular space. The motor frame outer barrel 14 is fixed to the outer cylinder 2 by using a water extracting pipe 46, an air extracting pipe 47, or a gauge piping pipe 48.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a full-circulation motor pump, and more particularly to a full-circulation motor pump having an annular space in the outer peripheral portion of the motor.

[0002]

2. Description of the Related Art Conventionally, a full-circumferential flow type pump in which an annular space is formed on the outer circumference of a motor is known. In these all-circumferential flow pumps, in order to fix the outer casing of the motor frame and the outer casing, a fixing rib or the like, which is a separate member, is welded between the outer casing of the motor frame and the outer casing.

[0003]

However, welding a fixing rib or the like as a separate member as a means for fixing the outer casing of the motor frame to the outer casing has the problems of poor workability and high cost. It was

The present invention has been made in view of the above-mentioned circumstances, and by devising originally necessary members such as a water drain pipe, an air drain pipe, a gauge pipe, etc., without providing a separate member, It is an object of the present invention to provide a full-circulation motor pump capable of fixing the outer casing of the motor frame and the outer cylinder.

[0005]

In order to achieve the above object, an all-round motor pump according to the present invention is provided with a motor frame outer case provided on an outer peripheral portion of a stator of a motor and an outer circumference of the motor frame outer case. An outer cylinder that forms an annular space between the surface and
In a pump assembly including a pump portion that guides a handled liquid to the annular space, the motor frame outer case and the outer cylinder are fixed by using a water drain pipe, an air drain pipe, or a gauge pipe. It is what

[0006]

According to the present invention having the above-described structure, the motor frame outer casing can be provided without devising a separate member by devising the originally necessary member such as the water drain pipe, the air drain pipe, or the gauge pipe. And the outer cylinder can be welded. A notch is provided in each of the pipes, and the pipe and the outer cylinder are welded while the pipe is pressed from the outer cylinder side to the outer body side of the motor frame. The outer case and outer cylinder can be fixed.

Further, according to one aspect of the present invention, water can be completely drained by providing a hole in the side peripheral surface of the pipe. Further, by welding the inside of the water drain pipe, the air drain pipe, or the gauge pipe to the motor frame outer shell, the motor frame outer shell and the outer cylinder can be more firmly fixed.

Further, in the pump constructed so that the lead wire for connecting the power supply is taken out from the side surface of the outer cylinder, the welding of the cable housing portion is also used,
Further, the outer casing of the motor frame and the outer cylinder can be fixed with high reliability.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a full-circulation motor pump according to the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a full-circulation motor pump according to the present invention. The full-circulation motor pump shown in this embodiment is a pump casing 1.
And a canned motor 6 housed in the pump casing 1, and impellers 8 and 9 fixed to a main shaft 7 of the canned motor 6. The pump casing 1 includes a pump casing outer cylinder 2, a suction casing 3 and flanges 51 and 52, which are connected to both ends of the pump casing outer cylinder 2, respectively, and a discharge casing 4. The pump casing outer cylinder 2, the suction casing 3, and the discharge casing 4 are made of sheet metal such as stainless steel.

The first stage impeller 8 has a return blade 10a.
The second-stage impeller 9 is housed in the first inner casing 10 having a guide device 11a. Further, an elastic seal 12 is interposed between the first inner casing 10 and the suction casing 3.
A liner ring 45 is provided at the inner ends of the first and second inner casings 10 and 11.

On the other hand, the canned motor 6 includes a stator 13
A motor frame outer shell 14 fitted to the outer peripheral portion of the stator 13, motor frame side plates 15 and 16 welded and fixed to both open ends of the motor frame outer shell 14, and an inner peripheral portion of the stator 13. Is attached to the motor frame side plate 15,
A can 17 that is welded and fixed to 16 is provided. A rotor 18 rotatably housed in the stator 13 is shrink-fitted and fixed to the main shaft 7. A cable housing 20 is fixed to the outer casing 14 of the motor frame by welding, and a lead wire is drawn out from a coil inside the outer casing 14 of the motor frame to the outside.
It is designed to connect to the power cable within 0.

The cable housing 20 is shown in FIGS.
The open end 20 as shown in FIG.
It has a cup shape having a and a bottom portion 20b, and has an open end 2
0a is hermetically welded to the outer frame 14 of the motor frame, and the bottom 20
A hole 20c for passing a lead wire is formed in b. The cable housing 20 has an oval cross section that is long in the axial direction of the canned motor 6 and short in the circumferential direction of the motor. The lead wire passage hole 20c is offset from the center position O of the oval by a distance e. I have a heart. Therefore, it is possible to greatly reduce the flow passage area of the annular flow passage 40 between the motor frame outer case 14 and the outer cylinder 2, or to prevent the fluid from colliding with the cable housing 20 to cause a loss.

The opening area A ₁ of the open end 20a of the cable housing is set larger than the opening area A ₂ of the lead wire take-out hole 14a of the motor frame outer case 14.
Therefore, the motor stator 13 and the motor frame outer case 1
It is possible to prevent the contact surface of No. 4 from decreasing and to secure a sufficient space for accommodating the lead wire of the motor.

A hole 2a is formed in the outer cylinder 2,
The cable housing 20 is inserted into the hole 2a,
The outer cylinder 2 and the cable housing 20 are hermetically welded. A cable connector 41 for holding a cable 53 is inserted into a hole 20c for passing a lead wire formed in a bottom portion 20b of the cable housing 20, and the cable connector 41 and the cable housing 20 are fixed by welding. .

Next, the bearing peripheral portion on the anti-thrust load side will be described. The bearing bracket 21 includes a radial bearing 2
2 and a fixed thrust bearing 23 are provided. The end surface of the radial bearing 22 also has a function as a fixed-side thrust sliding member. On both sides of the radial bearing 22 and the fixed thrust bearing 23, a rotary thrust bearing 24, which is a rotary thrust sliding member, and a thrust collar 2 are provided.
5 are provided. The rotation side thrust bearing 24 is fixed to the thrust disk 26, and the thrust disk 2
6 is fixed by a screw and a nut 28 provided at the end of the main shaft 17 via a sand guard 27.

The bearing bracket 21 is inserted into a spigot provided on the motor frame side plate 16 via an O-ring 29 made of an elastic material. Bearing bracket 2
1 is in contact with the motor frame side plate 16 via a gasket 30 made of an elastic material. Reference numeral 31 in the drawing denotes a sleeve which forms a sliding portion with the radial bearing 22.

Next, the peripheral portion of the bearing on the thrust load side will be described. The bearing bracket 32 includes a radial bearing 3
3 is provided. In the figure, 34 is a sleeve that forms a sliding portion with the radial bearing 32, and the sleeve 34 is a washer 3
5, the washer 35 is fixed via the impeller 9, the sleeve 42, and the impeller 8 by the screw and nut 36 provided at the end of the main shaft 7. The bearing bracket 32 is inserted into a spigot provided on the motor frame side plate 15 via an O-ring 37 made of an elastic material. The bearing bracket 32 is in contact with the motor frame side plate 15.

Next, a method of fixing the canned motor 6 and the pump casing 1 will be described. Cable housing 2 welded to the outer frame 14 of the canned motor 6
0 is inserted into the hole 2a of the outer cylinder 2, and the outer cylinder 2 and the cable housing 20 are welded. A stay 43 is welded to the outer body 14 of the motor frame, and the stay 43 and the outer cylinder 2 are fixed by welding.

A water drain pipe 46 having a notch 46a, an air drain pipe 47 having a notch 47a, and a gauge pipe 48 having a notch 48a are provided from the outer cylinder 2 side to the motor frame outer case 14 Since the pipes 46, 47, 48 and the outer cylinder 2 are welded to each other while being pressed to the side, the tips of the notches 46a, 47a, 48a bite into the motor frame outer body 14, so that the motor frame outer body is firmly held. 14 and the outer cylinder 2 can be fixed.
The water draining pipe 46, the air draining pipe 47, and the gauge piping pipe 48 are provided with holes 46b and 47 on the side circumferential surfaces, respectively.
Since it has b and 48b, it can completely drain water.

Next, a method of assembling the all-circumferential flow type pump constructed as described above will be described with reference to FIG. First, as shown in FIG. 3, the motor frame outer plates 14 are pre-welded with the motor frame side plates 15 and 16. Further, the cable housing 20 is attached to the outer frame 14 of the motor frame.
And the stay 43 are welded together to manufacture the motor frame assembly 50.

Next, the motor frame assembly 5 is placed in the outer cylinder 2.
0 and insert the cable housing 20 into the hole 2a of the outer cylinder 2.
Insert.

Next, the cable housing 20 and the outer cylinder 2 are welded while the water draining pipe 46, the air draining pipe 47 and the gauge piping pipe 48 are pressed from the outer barrel 2 side to the motor frame outer barrel 14 side. At the same time, the pipes 46, 47, 48 and the outer cylinder 2 are welded. Thereby, the cutouts 46a, 47a, 4 of the pipes 46, 47, 48 are formed.
The tip of 8a bites into the motor frame outer case 14, and the motor frame assembly 50 is fixed to the outer cylinder 2. And
The discharge casing 4 is fixed to the outer cylinder 2 by the flanges 51 and 52.

Next, after inserting the main shaft 7 in which the rotor 18 and the bearing on the anti-thrust load side are integrally incorporated into the motor frame assembly 50, the bearing on the thrust load side and the impellers 8 and 9 are attached to the main shaft 7. The first and second inner casings 10 and 11 are fixed while being mounted.

Next, the elastic seal 12 is attached to the inner casing 10.
The suction casing 3 is fixed to the outer cylinder 2 by the flanges 51 and 52 in the state of holding. Next, the cable connector 41 is welded to the cable housing 20, and the crimp terminal 5
5, the lead wire L of the motor is connected to the external cable 53, and these are housed in the cable housing 20. By the above work, the assembly of the all-circumferential motor pump is completed.

FIG. 4 is a view showing a modified example of each fixing pipe in the full-circulation motor pump of the present invention. In the present embodiment, the water draining pipe 56, the air draining pipe 57, and the gauge piping pipe 58 are welded and fixed to the outer surface of the motor frame outer shell 14 respectively. The pipes 56, 57, 58 and the outer cylinder 2 are fixed by welding. As a result, the canned motor 6 is moved to the outer cylinder 2
Can be firmly fixed to. Each pipe 56, 57, 5
8 has holes 56b, 57b and 58b on the side peripheral surface.

FIG. 5 is a sectional view showing another embodiment of the full-circulation motor pump of the present invention. The full-circulation motor pump according to this embodiment is a double-suction pump. 5, constituent elements having the same operations and functions as those of the constituent elements of FIG. 1 are designated by the same reference numerals and described.

The full-circulation type double suction pump shown in FIG.
A canned motor 6 is provided in the center, and impellers 8A, 9A; 8B, 9B having suction portions that open axially outward are fixed to both shaft ends of a main shaft 7 of the canned motor 6, respectively. A cable housing 20 is fixed to the motor frame outer case 14. The canned motor 6 and the outer cylinder 2 include the cable housing 20, the water drainage pipe 56, the air drainage pipe 57, and the gauge pipe 58 (in FIG. 5, the water drainage pipe 5) as in the above-described embodiment.
(Only 6 is shown) and are integrally fixed. Then, the covers 63, 63 are provided at both ends of the outer cylinder 2 with the flanges 51.
And 52 are integrally fixed. The outer cylinder 2 has suction windows 2b and 2c, and these suction windows 2b and 2c are connected by a suction cover 55. At the center of the suction cover 55, a pump suction port 55a is formed and a suction flange 59 is fixed.

Partition plates 65, 65 are fixed inside the outer cylinder 2. The partition plates 65, 65 have a substantially cylindrical container shape,
The seal members 75, 75 are fixed to the openings 65a, 65a, and the suction openings 65c, 65c are formed in the bottoms 65b, 65b. In addition, the first inside the partition plate 65,65
Inner casing 10A, 10B and second inner casing 11
A and 11B are installed. Further, a discharge port 2d is formed at the center of the outer cylinder 2 and a discharge nozzle 68 is connected to the discharge port 2d. A discharge flange 69 is integrally fixed to the discharge nozzle 68.

[0029]

As described above, according to the present invention, the motor frame can be constructed by devising the originally necessary members such as the water drain pipe, the air drain pipe, the gauge pipe, etc. without providing a separate member. The outer shell and outer cylinder can be welded. A notch is provided in each of the pipes, and the pipe and the outer cylinder are welded while the pipe is pressed from the outer cylinder side to the outer barrel side of the motor frame. The outer shell of the frame and the outer cylinder can be fixed.

Further, according to one aspect of the present invention, the water can be completely drained by providing the hole on the side peripheral surface of the water draining pipe. Further, by welding the inside of the water drain pipe, the air drain pipe, or the gauge pipe to the motor frame outer shell, the motor frame outer shell and the outer cylinder can be more firmly fixed.

Further, in the pump constructed so that the lead wire for connecting the power source is taken out from the side surface of the outer cylinder, the welding of the cable housing portion is also used,
Further, the outer casing of the motor frame and the outer cylinder can be fixed with high reliability.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a full-circulation motor pump according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a cross-sectional view showing a method of assembling the full-circulation motor pump according to the present invention.

FIG. 4 is a cross-sectional view showing a modified example of the full-circulation motor pump according to the present invention, which is a cross-sectional view corresponding to FIG. 2.

FIG. 5 is a sectional view showing another embodiment of the full-circulation motor pump according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump casing 2 Outer cylinder 3 Suction casing 4 Discharge casing 6 Canned motor 7 Main shaft 8,9 Impeller 13 Stator 14 Motor frame outer body 15,16 Motor frame side plate 17 Can 18 Rotor 20 Cable housing 21,32 Bearing bracket 22 , 33 Radial bearing 23 Fixed-side thrust bearing 24 Rotating-side thrust bearing 43 Stay 46,56 Drainage pipe 47,57 Air-bleeding pipe 48,58 Gauge pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Keita Uei 4-2-1 Honfujisawa, Fujisawa City, Kanagawa Prefecture EBARA Research Institute

Claims (5)

[Claims] 1. A motor frame outer case provided on an outer peripheral portion of a stator of a motor, an outer cylinder forming an annular space between the outer peripheral surface of the motor frame outer case, and a pump for introducing a handling liquid into the annular space. A pump assembly including a portion, wherein the outer casing and the outer cylinder of the motor frame are fixed by using a water drain pipe, an air drain pipe, or a gauge pipe. 2. The full-circulation motor pump according to claim 1, wherein a notch is provided on an end face of the water drain pipe, the air drain pipe, or the gauge pipe on the outer body side of the motor frame. 3. The full-circulation motor pump according to claim 1, wherein a hole is provided in a side peripheral surface of the water draining pipe, the air draining pipe or the gauge pipe. 4. The water drain pipe, the air drain pipe, or the gauge pipe pipe and the outer surface of the outer casing of the motor frame are welded and fixed to each other.
The full-circulation motor pump according to any one of 1. 5. A lead wire for power supply connection is taken out from a side surface of the outer cylinder, and a cable housing is integrally or welded to the outer body of the motor frame, and the cable housing and the outer cylinder are sealed. The full-circulation motor pump according to any one of claims 1 to 4, which is welded.