JP2886444B2 - All circumferential pump - Google Patents

Abstract

A full-circumferential flow pump includes a motor having a stator, a shaft rotatably disposed in the stator, and a rotor mounted on the shaft for rotation relative to the stator, an outer frame casing (25) disposed around the stator, an outer cylindrical pump casing (5) disposed around the outer frame casing with an annular space (40) defined therebetween, and a pump assembly mounted on an end of the shaft for pumping a fluid into the annular space (40). The outer cylindrical pump casing has a suction window (5a,5b) for introducing a fluid therethrough. A suction case (10) is mounted on the outer cylindrical pump casing (5) for introducing a fluid therethrough and through the suction window (5a,5b) into the pump assembly, the suction casing having a suction port defined therein. <IMAGE>

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an all peripheral flow type pump,
In particular, the present invention relates to an all-peripheral flow type pump having an impeller at a shaft end of a motor and an annular space at an outer peripheral portion of the motor.

[0002]

2. Description of the Related Art Among pumps configured so that a liquid to be handled flows around the outer periphery of a motor, one type of pump configured to perform manual rotation of a shaft and maintenance of a pump portion without removing a pipe is a German type. Publication No. 165
No. 3692 (DE1653692).

As shown in FIG. 12, a motor stator 101 is installed in a block-shaped main body 100. The motor rotor 102 is disposed with a slight gap from the motor stator 101, and impellers 103 and 104 are fixed to both shaft ends of the motor rotor 102. The fluid flows in from the suction port 105 and branches right and left, and the impeller 103,
The voltage is boosted by 104. The fluid discharged by the impellers 103 and 104 merges and is discharged from the discharge port 106.

[0004]

However, in the pump disclosed in the above-mentioned publication, the pressure applied to the motor stator is not uniform, and there is a high possibility that problems related to this will occur. That is, there are three parts on the outer periphery of the motor: a part where the liquid on the suction pressure side flows, a part where the liquid on the discharge pressure side flows, and a part where no liquid flows. Therefore, the pressure (external force) applied to the motor stator is non-uniform, which may result in distortion or deformation.

[0005] In particular, there is a high possibility that trouble will occur when the outer frame of the motor frame is made of a thin sheet metal material or when the pump discharge pressure is high. Further, in the pump described in the above publication, since the motor frame outer body and the outer cylindrical portion are integrally formed, it is conceivable that an external force such as a pipe load may interfere with the motor portion.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and makes it possible to equalize an external force (external pressure) applied to a motor frame outer body surrounding a motor stator, thereby preventing distortion and deformation of the motor frame and reducing piping. An object of the present invention is to provide an all-circumferential pump that can maintain the inside without removing it.

[0007]

In order to achieve the above object, a first aspect of the present invention is to provide a method of manufacturing a motor, comprising the steps of: In a pump assembly including an outer cylinder that forms an annular space and a pump unit that discharges a handling liquid into the annular space, a pump unit is disposed at a shaft end of a motor, and an outer cylinder outer peripheral portion is provided with a pump unit. A suction case and a suction window for introducing liquid are provided, and a pump suction port is provided in the suction case.

According to a second aspect of the present invention, there is provided a motor frame outer shell provided on a motor stator outer peripheral portion, and an outer cylinder forming an annular space between the motor frame outer shell outer peripheral surface,
In a pump assembly having a pump section for guiding a handling liquid to the annular space, a pump section is disposed at both shaft ends of the motor, and a suction case for guiding suction liquid to the pump sections at both ends is provided on an outer peripheral portion of the outer cylinder. A suction window is provided, a pump suction port is provided in the suction case, and a pump discharge port is provided in the outer cylinder.

[0009]

According to the first aspect of the present invention, the fluid sucked from the pump suction port of the suction case flows into the pump section by the suction case and is guided into the impeller at the shaft end of the motor. The fluid discharged from the impeller flows into an annular space (flow path) formed between the outer cylinder and the motor frame outer body of the canned motor. Therefore, the entire outer periphery of the motor frame is surrounded by the pump discharge liquid and receives a uniform pressure, so that non-uniform distortion and deformation do not occur.

According to the second aspect of the present invention, the pump can be constituted as an all-circumferential flow type double suction pump, and the fluid sucked from the pump suction port of the suction case flows into the left and right pump portions by the suction case. , Are guided into the left and right impellers.
Fluids discharged from the left and right impellers flow into an annular space (flow path) formed between the outer cylinder and the motor frame outer body of the canned motor, and merge while flowing through the annular flow path,
It is discharged from the discharge port of the outer cylinder.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an all-circumferential pump according to the present invention. 1 to 4 show a first embodiment of the present invention. FIG. 1 is a cross-sectional view of a full-circumferential flow type double suction pump, which is one type of the full-circumferential flow pump of the present invention,
FIG. 2 is a sectional view taken along line II-II of FIG. 1.

The all-peripheral flow type double suction pump has a canned motor 1 at the center, and an impeller 3 having a suction portion which is open outward in the axial direction at both shaft ends of a main shaft 2 of the canned motor 1.
A, 4A; 3B, 4B are respectively fixed. The pump units provided on both sides of the canned motor 1 have the same cutoff head and different flow rates. An outer cylinder 5 for accommodating the canned motor 1 and the impellers 3A, 4A; 3B, 4B and left and right covers 6, 7 are provided. The outer cylinder 5 and the cover 6 and the outer cylinder 5 and the cover 7
9 is fixed. The blades of the impellers 3A, 4A; 3B, 4B are made of sheet metal.

The outer cylinder 5 has suction windows 5a and 5b near both ends, and a suction case 10 is installed outside the outer cylinder 5 so as to connect the suction windows 5a and 5b. The suction case 10 has a pump suction port 11 opened in the center. As also can not air pocket in the suction case 10, the corresponding suction windows 5a of the outer peripheral portion of the outer cylinder 5 as shown in FIG. 2, the circumferential width W ₁ of 5b and the width W ₂ of the suction case 10 Let me. The pump inlet 11 is provided with a suction flange 12.

Partition plates 15 and 16 are fixed inside the outer cylinder 5. The partition plates 15 and 16 have openings 15a and 16
a, sealing members 17, 17 made of an elastic material such as rubber are fixed to the bottom portions 15b, 16b.
Are formed.

Inside the partition plates 15 and 16, first inner casings 18A and 18B and second inner casings 19A and 19B are provided, respectively. The first inner casings 18A, 18B have return blades 18a, 18a,
The inner casings 19A, 19B have guide devices 19a, 19a constituting guide vanes or volutes.
The second inner casings 19A and 19B have a spigot fitting portion, and the spigot fitting portion is fitted to the motor frame 24 of the canned motor 1. First inner casing 18
Seal members 20, 20 are interposed in the gaps between A, 18B and the partition plates 15, 16, respectively. The seal members 20, 20 seal the suction side (low pressure side) and the discharge side (high pressure side). Have been. First and second inner casing 1
Liner rings 21 are provided at the inner ends of 8A, 18B; 19A, 19B, respectively.

The motor frame 2 of the canned motor 1
Reference numeral 4 denotes a substantially cylindrical frame outer shell 25, and frame side plates 26, 27 provided at both side openings of the frame outer shell 25.
It is composed of The cable housing 22 is fixed to the motor frame outer body 25 by welding.
A lead wire is drawn out from a coil in the outer frame 25 of the motor frame and connected to a power cable 46 in the cable housing 22. A cable connector 47 for holding the power cable 46 is welded to the cable housing 22.

In the motor frame 24, a stator 28 and a rotor 29 are provided. The rotor 29 is supported by the main shaft 2, and a cylindrical can 30 is fitted inside the stator 28.

Bearing housings 31 and 32 are provided on the frame side plates 26 and 27 so as to be detachable. The bearing housings 31 and 32 hold radial bearings 33 and 34, respectively. 2 is rotatably supported by the shaft sleeve 35 fitted to the
Numeral 4 is adapted to rotatably support a shaft sleeve 36 fitted to the main shaft 2. The bearing housings 31, 32 and the motor frame side plates 26, 27 are fixed by clearance fit inlays and O-rings 37, 38 made of elastic material.

Thus, an annular space 40 is formed between the outer cylinder 5 and the motor frame 24 of the canned motor 1, and an opening 5c is formed in the outer periphery of the outer cylinder 5, and a discharge nozzle is formed in this opening. 41 is fixed. Discharge nozzle 41
Is provided with a discharge port 41a and a discharge flange 4
2 is fixed.

Next, a method of fixing the canned motor 1 and the outer cylinder 5 will be described with reference to FIG. First, as shown in FIG.
6, 27 are welded in advance. Further, the cable housing 22 is welded to the outer frame 25 of the motor frame, and the stay 43 is welded to manufacture the motor frame assembly 50.

Next, the motor frame assembly 5 is placed in the outer cylinder 5.
0 and insert the cable housing 22 into the hole 5 d of the outer cylinder 5.
Insert

Next, the pipe 45 and the outer cylinder 5 are welded to each other by pressing the drainage pipe 45 having the notch 45a against the motor frame outer body 25 from the outer cylinder 5 side. Can bite into the motor frame outer shell 25, so that the motor frame outer shell 25 and the outer cylinder 5 can be firmly fixed.

FIGS. 4A and 4B are external views of the all circumferential flow type double suction pump of the present invention. FIG. 4A is a front view, and FIG. 4B is a side view. The all circumferential flow type double suction pump is configured as a side-top type in which the suction port 11 is provided on the side and the discharge port 41a is provided on the top. Legs 48, 48 are fixed to flanges 8, 9, which connect the outer cylinder 5 and the covers 6, 7, respectively. These legs 48, 48 are fixed to a base 49.

Next, the operation of the all-peripheral flow type double suction pump constructed as described above will be described. The fluid sucked from the pump suction port 11 branches right and left by the suction case 10 and flows into the pump section through the suction windows 5a and 5b. The fluid flowing into the pump unit passes through suction openings 15c, 16c formed in the partition plates 15, 16, and the impellers 3A, 3B;
The voltage is boosted by A and 4B. The fluid discharged from the impellers 4A and 4B passes through the guide devices 19a and 19a, and the flow direction is changed from the centrifugal direction to the axial direction.
And flows into an annular flow path 40 formed between the motor frame 24 of the canned motor 1 and merges while flowing through the flow path 40, and is discharged from the discharge port 41 a through the discharge nozzle 41 through the opening 5 c of the outer cylinder 5. Is done.

According to this embodiment, the motor frame outer body 2
5, the entire circumference is surrounded by the pump discharge liquid and receives a uniform pressure, so that non-uniform distortion and deformation do not occur. Further, since the partition walls 15 and 16 are provided on the inner peripheral portion of the outer cylinder 5, the inside of the outer cylinder can be separated into the pump suction pressure side and the pump discharge pressure side, and the radial and circumferential pressures inside the outer cylinder can be reduced. The distribution can be uniform.

The inner peripheral portion of the outer cylinder 5 and the partition walls 15, 16
Sealing member 1 made of an elastic material such as rubber between itself and the outer peripheral portion
7, the partition walls 15 and 16 can be made detachable, and the pump suction pressure side and the pump discharge pressure side can be reliably separated.

Further, in this embodiment, the covers 6 and 7 for disassembling and assembling are provided at both ends of the outer cylinder 5, so that internal maintenance can be performed without removing the piping.
In particular, in the case of canned motor pumps, maintenance parts are mainly sliding parts such as bearings and liner rings. However, in this structure, by removing covers 6 and 7, the entire rotating body and bearing Without removing)
Can be removed from the body.

Further, according to this embodiment, in the double-suction pump, the flow rate can be the responsible to split two of the pump portion, specific speed Ns = 1/2 ^1/2, and the impeller shape Becomes a substantially two-dimensional blade, and press forming of the impeller becomes easy. Also, it is generally known that as the flow velocity at the impeller inlet increases, the suction performance during the suction operation deteriorates.
The two-suction type pump can share the flow rate by the two pump sections, which is also advantageous in this respect. Further, in the double-suction type pump, the load capacity of the bearing can be reduced because the axial thrust generated by the pump is balanced. Since the shaft thrust is balanced, the bearing housing 31,
The fixing of the motor frame 24 to the motor frame 32 may be simple. As in the present embodiment, the clearance fit and the O-rings 37, 3
If it is fixed by 8, the self-aligning function of the bearing can be expected, and the processing accuracy of the peripheral part is not required. The double suction pump of this embodiment is highly effective at high rotation speeds (4000 rpm or more) due to the hydro design and the axial thrust load.

Further, according to this embodiment, since the pressures before and after the rotor chamber are perfectly balanced, slurry is not drawn into the rotor chamber. If the impeller is provided with a back impeller under this condition, even if there is a slurry that happens to approach the back of the impeller, it can be forcibly repelled to the outer peripheral side. Therefore, it can be said that the structure has extremely high durability against the slurry liquid.

According to the present embodiment, welding of the motor frame outer shell 25 and the motor frame side plates 26 and 27 can be completed before welding of the outer cylinder 5. Therefore, both ends of the outer cylinder 5 can be extended, and the outer case 5 can be provided with the suction case 10 and the suction windows 5a and 5b can be formed. The header pipe for connecting the two suction windows 5a and 5b can be provided. There is no need to provide such a device.

FIGS. 5 to 9 show a second embodiment of the present invention. Since the basic configuration of this embodiment is the same as that of the first embodiment shown in FIGS. 1 to 4, the description of the same configuration will be omitted, and only the configuration different from the first embodiment will be described.
FIG. 5 is a cross-sectional view of an all-circumferential flow type double suction pump, FIG. 6 is a view showing details of an outer cylinder, FIG.
FIG. 7B is a sectional view taken along line VI (b) -VI (b) of FIG. FIG. 7 is a detailed view of a portion А in FIG. 5, and FIG.
FIG. 8 is a sectional view taken along line VIII.

In this embodiment, as shown in FIG. 6 (only one of the suction windows 5a is shown in FIG. 6), the suction windows 5a and 5b formed in the outer cylinder 5 are axially connected to the suction window 5a. Since the extending bar 51 is provided, the sealing member 1
7 into the suction window 5 of the outer cylinder 5.
The work of inserting into the depths of a and 5b can be easily performed. As also can not air pocket in the suction casing 10, corresponding to the width W ₂ of the suction casing 10 suction windows 5a of the outer peripheral portion of the outer cylinder 5, the width W ₁ of the circumferential direction of 5b as shown in FIG. 6 Let me.

Further, the leading ends of the partition walls 15 and 16 are shown in FIG.
As shown in FIG. 7 (only one partition wall 15 is shown in FIG. 7), a stopper 52 for holding the seal member 17 is provided to prevent the seal member 17 from falling off. Further, as shown in FIG. 7, an expanded portion 5d is formed in the inner diameter of the outer cylinder 5 on the suction pressure side. By providing the expanded portion 5d, the work of inserting the partition walls 15, 16 incorporating the sealing member 17 into the suction windows 5a, 5b of the outer cylinder 5 can be easily performed. Further, the deformation of the suction window in the direction indicated by the arrow due to the difference between the inner and outer pressures of the outer cylinder 5 can be prevented. And the cylindricity and strength of the outer cylinder 5 can be ensured by expanding the tube.

Further, in this embodiment, as shown in FIG. 5, the frequency converter 54 is attached to the cover 6 which closes one end of the outer cylinder 5.
Is fixed, and a cover 55 is provided so as to cover the frequency converter 54. Since the frequency converter 54 is fixed to the cover 6 with which the handling liquid contacts, the frequency converter 5
4 is cooled efficiently. Highly integrated circuits such as frequency converters are generally vulnerable to external forces and vibrations, but in this regard, the outer cylinder outer periphery to which the pump discharge pressure is particularly applied (deforms due to the discharge pressure)
Rather, it is more reliable to attach it to the outer surface of the cover 6 to which only suction pressure is applied.

In the present embodiment, a plug 56 for hand-turning confirmation is detachably provided on the cover 7 closing the other end of the outer cylinder 5. According to the present embodiment, it is possible to check the rotation of the rotating body without removing the cover 7. That is, after removing the plug 56, a screwdriver (driver) is hung on the groove 2a at the shaft end, and after confirming that the rotating body can be manually turned, the plug 56 may be attached.

Further, in this embodiment, as shown in FIGS. 5 and 8, a discharge window 5e is provided on the outer peripheral portion of the outer cylinder 5, and a discharge short pipe 57 is sealed and welded corresponding to the discharge window 5e. The discharge short pipe 57 has a discharge port 57a, and a discharge flange 58 is hermetically welded in the vicinity of the discharge port, and the discharge flange 58 and the outer peripheral portion of the outer cylinder are welded and joined by a reinforcing material 59. Therefore, the discharge port of the pump can be secured from an external force such as a pipe load. Further, since the applied external force is absorbed by the outer cylinder 5, a strong external force is not directly applied to the motor frame outer body 25 or the motor stator 28. Of course, even if there is no reinforcing material, it is unlikely that an external force is transmitted to the motor frame outer shell 25 because it is a completely double structure different from the known example. The reinforcing material 59
May be provided on the entire circumference of the outer cylinder 5 as shown by a virtual line in FIG. In this case, it is possible to prevent the outer cylinder 5 from expanding outward due to the pump internal pressure.

FIG. 9 is an external view of the all circumferential flow type double suction pump shown in FIG. The all-peripheral-flow double-suction pump has a suction port 11 on the side and a discharge port 57a on the top.
It is configured as a top type.

FIG. 10 is a sectional view showing a third embodiment of the all circumferential flow type pump according to the present invention. The all circumferential flow type pump of this embodiment is an all circumferential flow type single suction pump. 10, components having the same functions and functions as the components of FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted.

The all-peripheral flow type single-suction pump shown in FIG. 10 has a canned motor 1 at the center, and a suction portion opened at one axial end of the main shaft 2 of the canned motor 1 and opened outward in the axial direction. Are fixed. The impeller is not fixed to the other shaft end of the main shaft 2, and therefore, no partition wall is provided on one inner peripheral portion of the outer cylinder 5. Other configurations are substantially the same as those of the second embodiment shown in FIG.

In this embodiment, the pump is constituted as a single-circumferential type single-suction pump, and the fluid sucked from the pump suction port 11 flows into the pump section through the suction case 10 through the suction window 5a. The fluid that has flowed into the pump unit passes through a suction opening 15 c formed in the partition plate 15, and
The voltage is boosted by {, 4}. The fluid discharged from the impeller 4A changes its flow direction from the centrifugal direction to the axial direction via the guide device 19a, and then forms an annular flow path formed between the outer cylinder 5 and the motor frame 24 of the canned motor 1. 40, and is discharged from the discharge port 57a through the discharge short pipe 57. Since this embodiment is a single suction type pump, the operation and effect of the double suction type pump cannot be obtained, but the other operation and effects are the same as those of the embodiment shown in FIGS.

FIG. 11 is a sectional view showing a fourth embodiment of the all circumferential flow type pump according to the present invention. The all circumferential flow type pump of this embodiment is an end-top type pump. In FIG. 11, FIG.
Components having the same functions and functions as those of the component (1) will be assigned the same reference numerals and will not be described.

The all-peripheral flow type single-suction pump shown in FIG. 11 has a canned motor 1 at the center, and a suction portion opened at one axial end of the main shaft 2 of the canned motor 1 and opened outward in the axial direction. Is fixed. No impeller is fixed to the other shaft end of the main shaft 2, and no partition wall is provided on the inner peripheral portion of the outer cylinder 5. And
An outer cylinder 5 for housing the canned motor 1 and the impeller 3A, a suction casing 66, and a cover 7 are provided. Outer cylinder 5 and suction casing 66 and outer cylinder 5 and cover 7
Are fixed by flanges 8 and 9.

The suction casing 66 has a suction nozzle 6
7 is fixed, and the inner casing 18 is installed in the suction casing 66. And the inner casing 1
8 has a guide device 18a, and a seal member 20 is provided between the inner casing 18 and the suction casing 66.

The disassembly / assembly cover 7 is provided with a hand-operated confirmation plug 56 that is detachable. In this embodiment, the pump is configured as an end-top type pump, and the fluid sucked from the suction nozzle 67 flows into the pump section and is pressurized by the impeller 3A. The fluid discharged from the impeller 3 </ b> A changes its flow direction from the centrifugal direction to the axial direction via the guide device 18 a, and then forms an annular flow path formed between the outer cylinder 5 and the motor frame 24 of the canned motor 1. 40, and is discharged from the discharge port 57a through the discharge short pipe 57. Since this embodiment does not include a partition wall, the function and effect related to the partition wall cannot be obtained, but other functions and effects are the same as those of the embodiment shown in FIG.

[0045]

As described above, according to the present invention, the entire outer periphery of the motor frame is surrounded by the pump discharge liquid, and receives a uniform pressure. Does not occur. In addition, since a partition wall is provided on the inner periphery of the outer cylinder, the inside of the outer cylinder can be separated into the pump suction pressure side and the pump discharge pressure side, and the pressure distribution in the radial and circumferential directions inside the outer cylinder is made uniform. it can.

Further, since a seal member made of an elastic material such as rubber is interposed between the inner peripheral portion of the outer cylinder and the outer peripheral portion of the partition wall, the partition wall can be made detachable, and can be connected to the pump suction pressure side. The pump discharge pressure side can be reliably divided.

In the present invention, since disassembly / assembly covers are provided at both ends of the outer cylinder, internal maintenance can be performed without removing the piping. In particular, in the case of canned motor pumps, maintenance parts are mainly sliding parts such as bearings and liner rings, but with this structure, the complete rotating body and complete bearing can be removed from the main body without removing the piping. .

[0048] Further according to the invention, the flow rate as a double-suction pump can be responsible divided by two of the pump portion, specific speed Ns = 1/2 ^1/2, and the impeller is a two-dimensional airfoil substantially Press forming of the impeller becomes easy.

According to the present invention, a leg can be provided on the flange. In addition, the cooling condition is extremely good because the self liquid passes through the entire outer periphery of the motor. Therefore, the size of the motor can be reduced.

Further, according to the present invention, the self-liquid flows freely into and out of the rotor chamber, so that the motor can be cooled and downsized. Further, it is not necessary to ensure watertightness between the rotor chamber and the pump section, and the shaft thrust is balanced, so that the fixing of the bearing section and the motor frame may be simple. Then, as in the present invention, if the bearing is fixed with a clearance fit and an O-ring, a self-aligning function of the bearing can be expected, and the processing accuracy of the peripheral portion is not required.

Further, according to the present invention, since pumps having different flow rates can be combined on both sides of the motor, for example, by combining pumps having a common flow rate of 1 and 1.6 at both shaft ends, a flow rate of 2 can be obtained. (1 + 1), 2.6 (1 + 1.6),
Three types of pumps of 3.2 (1.6 + 1.6) can be manufactured.

Further, according to the present invention, since the pressure before and after the rotor chamber is perfectly balanced, slurry is not introduced into the rotor chamber. Under this condition, if the impeller is provided with a back impeller, even if there is a slurry that happens to approach the back of the impeller, it can be forcibly repelled to the outer peripheral side. Therefore, it can be said that the structure has extremely high durability against the slurry liquid.

Further, according to the suction cover of the present invention, no air pool is generated and no inconvenience occurs in the operation of the pump. Moreover, since there is no need to provide a header pipe for connecting the two suction windows, the pump can be maintained without removing the pipe.

Further, according to the present invention, when a multi-stage double suction pump is constructed, an outer peripheral flow path is formed using a partition plate, and a suction cover is provided at the outer peripheral flow path. Regardless of the multi-stage pump, the overall pump length can be reduced.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of an all-periodic flow pump according to the present invention.

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

FIG. 3 is a sectional view showing an assembling procedure of the all-peripheral flow type pump according to the present invention.

FIG. 4 is a view showing the appearance of the all-circumferential pump according to the present invention, wherein FIG. 4 (a) is a front view and FIG. 4 (b) is a side view.

FIG. 5 is a sectional view showing a second embodiment of the all-periodic flow pump according to the present invention.

6A and 6B are diagrams showing a detailed structure of an outer cylinder in a second embodiment, where FIG. 6A is a longitudinal sectional view, and FIG. 6B is FIG. 6A.
FIG. 6 is a sectional view taken along line VI (b) -VI (b) of FIG.

FIG. 7 is a cross-sectional view showing details of a portion A in FIG. 5;

8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is a perspective view of the all-periodic flow pump shown in FIG.

FIG. 10 is a sectional view showing a third embodiment of the all-peripheral flow type pump according to the present invention.

FIG. 11 is a sectional view showing a fourth embodiment of the all-peripheral flow type pump according to the present invention.

FIG. 12 is a sectional view showing a conventional pump.

[Explanation of symbols]

 Reference Signs List 1 canned motor 2 main shaft 3A, 3B, 4A, 4B impeller 5 outer cylinder 6, 7 cover 8, 9 flange 10 suction cover 11 pump suction port 15, 16 partition plate 18A, 18B first inner casing 19A, 19B second inner Casing 17, 20 Seal member 22 Cable housing 24 Motor frame 25 Frame outer shell 26, 27 Frame side plate 31, 32 Bearing housing 37, 38 O-ring 40 Annular flow path 41 Discharge nozzle 51 Bar 52 Stopper 54 Frequency converter 56 Plug 57 Discharge Short pipe 59 Reinforcement

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Keita Uei 4-2-1 Motofujisawa, Fujisawa-shi, Kanagawa Ebara Research Institute, Inc. (56) References JP-A-5-340393 (JP, A) Sho 61-40487 (JP, A) Shokai Sho 50-15001 (JP, U) Shoko 58-19355 (JP, Y2) Shoko 55-26551 (JP, Y2) Shoko 57-41420 (JP , Y2) European Patent Application 648934 (EP, A1) (58) Fields investigated (Int. Cl. ⁶ , DB name) F04D 29/52 F04D 13/06

Claims (23)

(57) [Claims] 1. A motor frame outer body provided on an outer peripheral portion of a motor stator, an outer cylinder forming an annular space between the motor frame outer body outer peripheral surface, and a pump section for discharging a handling liquid into the annular space. In the pump assembly, a pump portion is disposed at a shaft end of the motor, and a suction case and a suction window for guiding a suction liquid to the pump portion are provided on an outer peripheral portion of the outer cylinder, and a pump suction port is provided in the suction case. All-circumferential pump characterized by the provision of: 2. The all circumferential flow type pump according to claim 1, wherein a partition wall for separating a pump suction pressure side and a pump discharge pressure side is provided on an inner peripheral portion of the outer cylinder. 3. The all circumferential flow type pump according to claim 2, wherein a seal member made of an elastic material is interposed between an inner peripheral portion of the outer cylinder and an outer peripheral portion of the partition wall. 4. The all-circumferential pump according to claim 3, wherein a stopper is provided on an outer peripheral portion of the partition wall to prevent the sealing member from falling off. 5. The all-circumferential pump according to claim 3, wherein a bar extending in the axial direction is provided on the suction window. 6. The all-circumferential pump according to claim 3, wherein an expanded portion is provided on an inner diameter portion of the outer cylinder on a suction pressure side. 7. The suction case according to claim 1, wherein a width in a circumferential direction of a suction window on an outer peripheral portion of the outer cylinder is made to correspond to a width of the suction case so that air does not accumulate in the suction case. 7. The all circumferential flow type pump according to any one of 6. 8. The apparatus according to claim 1, wherein a cover for disassembling and assembling is provided at an end of said outer cylinder.
All-circumferential pump according to the above item. 9. The pump according to claim 8, wherein the cover is provided with a plug or a lid for manually rotating and confirming the rotating body. 10. The pump according to claim 8, wherein a frequency converter is mounted on an outer surface of the cover. 11. The outer cylinder is made of a sheet metal material, a discharge window is provided on an outer peripheral portion of the outer cylinder, a discharge short pipe is hermetically welded to the discharge window, and a discharge flange is formed on the discharge short pipe. The all-circumferential pump according to any one of claims 1 to 10, wherein the discharge flange and the outer peripheral portion of the outer cylinder are welded and joined by a reinforcing material. 12. The pump according to claim 11, wherein the outer circumference of the outer cylinder is wrapped by the reinforcing member and the suction case. 13. A motor frame outer body provided on an outer peripheral portion of a motor stator, an outer cylinder forming an annular space between the motor frame outer body and an outer peripheral surface, and a pump section for guiding a liquid to be handled to the annular space. In the pump assembly provided with, a pump portion is disposed at both shaft ends of the motor, and a suction case and a suction window for guiding suction liquid to the pump portions at both ends are provided on the outer peripheral portion of the outer cylinder, and the pump is provided on the suction case. An all-circumferential type double suction pump, wherein a suction port is provided and a pump discharge port is provided in the outer cylinder. 14. The all circumferential flow type double suction pump according to claim 13, wherein a partition wall for separating a pump suction pressure side and a pump discharge pressure side is provided on an inner peripheral portion of the outer cylinder. 15. A cover for maintenance of a pump section is attached to both ends of the outer cylinder.
Or an all peripheral flow type double suction pump according to 14. 16. The pump according to claim 13, wherein a leg for directly or indirectly installing a pump is provided on the outer cylinder.
The all circumferential flow type double suction pump according to any one of the above items. 17. The suction case according to claim 13, wherein a circumferential width of a suction window in an outer peripheral portion of the outer cylinder is made to correspond to a width of the suction case so that air does not accumulate in the suction case. 17. The all-circumferential-flow double suction pump according to any one of 16. 18. A motor according to claim 18, wherein the motor is a cand type, and a bearing housing for supporting a main shaft of the motor and a motor frame are fixed by a clearance fit inlay and an O-ring made of an elastic material. The all circumferential flow type double suction pump according to any one of claims 13 to 17. 19. The method according to claim 19, wherein the number of rotations of the motor is at least 40.
00r. p. m. 2. The method according to claim 1, wherein
19. The all circumferential flow type double suction pump according to any one of 3 to 18. 20. The all-peripheral flow double suction pump according to claim 13, wherein the blades of the impeller are manufactured by sheet metal working. 21. Pumps having the same shutoff head and different flow rates are provided on both sides of the motor.
21. The all peripheral flow type double suction pump according to any one of 3 to 20. 22. The all circumferential flow type double suction pump according to claim 13, wherein a back blade is provided on a back surface of the impeller. 23. An impeller arranged at both ends of a main shaft of the motor is provided in multiple stages, and an inner casing is arranged inside the partition plate so as to cover each impeller except for the last stage impeller; 3. A return blade is provided for guiding fluid from a preceding impeller to a next impeller.
3. The all circumferential flow type double suction pump according to any one of 2.