JPH08219077A - Periphery flow type pump - Google Patents

Abstract

PURPOSE: To enlarge the outer diameter of an impeller without changing the outer diameter of a pump so as to obtain the inexpensive pump that can cope with high head by providing a guide device after handling at a double-shell structure body formed of a motor frame outer shell, a motor frame side plate and an outer cylinder, and fixing an impeller suction part and a sliding member to a suction casing. CONSTITUTION: A fluid sucked from a pump suction port 3a is pressure-boosted by an impeller 8 and then led to the axis side from the peripheral side by a return vane device 11. The fluid led axally by the return vane device 11 flows into a discharge casing 4 through an annular passage 40 and is discharged from a pump discharge port 4a. The return vane device 11 for guiding pumping liquid discharged from the impeller 8 is provided at a double-shell structure body formed of a motor frame outer shell 14, a motor frame side plate 15 and an outer cylinder 2, and a liner ring 45 sliding with an impeller suction part is fixed to a suction casing 3. The outer diameter of the impeller can thereby be made large without changing the outer diameter of a pump.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an all-circumferential flow type pump and a pump casing made of sheet metal used for the pump, and more particularly to an all-circumferential type pump manufactured by press-molding a steel plate such as stainless steel and the like. The present invention relates to a pump casing used for a pump.

[0002]

2. Description of the Related Art The applicant of the present invention has previously filed Japanese Patent Application Laid-Open No. 5-1108
No. 1 proposes a full-circulation pump. In this full-circulation pump, an inner casing is provided in the suction casing, and a guide device for guiding the fluid discharged from the impeller from the radial direction to the axial direction is provided in the inner casing.
Further, an elastic seal member is interposed between the inner casing and the suction casing.

[0003]

However, in the above-mentioned all-circumferential flow type pump, since the guide device for guiding the radial flow in the axial direction is provided on the outer peripheral portion of the impeller, the high lift type product is commercialized. Is disadvantageous in. In other words, it is a general method to increase the outer diameter of the impeller in order to increase the lift, but for that purpose, it is necessary to increase the maximum outer diameter of the pump, which does not meet the market demand for space saving in recent years. Moreover, there is a problem that the cost becomes high. Since the inner casing and the suction casing are separated from each other and the elastic seal member is interposed between the inner casing and the suction casing, there is a problem that the cost increases due to the use of the seal material.

The present invention has been made in view of the above-mentioned circumstances, and particularly in a single-stage all-circumferential flow type pump, the impeller outer diameter can be increased without increasing the pump outer diameter, and a low head cost can be achieved. Intended to provide a pump. Another object of the present invention is to provide a simple method in which even if an external force such as a pipe load is applied to a suction casing made of sheet metal, its deformation is not transmitted to a rotating body.

[0005]

In order to achieve the above-mentioned object, a first aspect of an all-circumferential flow type pump of the present invention is a motor frame outer shell provided on an outer peripheral portion of a stator of a motor, and the motor frame. An outer cylinder is formed between the motor frame side plate provided at the axial end portion of the outer body and the outer peripheral surface of the motor frame outer body, and an outer cylinder fixed to the outer body of the motor frame, and the annular space. In an all-circumferential type pump having a pump section for guiding the liquid to be handled, a suction casing is provided at the axially open end of the outer cylinder, and an impeller is provided between the suction casing and the side plate of the motor frame, and the discharge from the impeller A guide device for guiding the liquid to be handled is provided in the double cylinder structure body composed of the outer frame of the motor frame, the side plate of the motor frame, and the outer cylinder, and a sliding member sliding with the impeller suction part is fixed to the suction casing. And it is characterized in Rukoto.

A second aspect of the omnidirectional pump of the present invention is a motor frame outer body provided on an outer peripheral portion of a stator of a motor, and a motor provided on an axial end portion of the motor frame outer body. A total circumferential flow including an outer cylinder that forms an annular space between the frame side plate and the outer peripheral surface of the motor frame outer shell and is fixed to the outer shell of the motor frame, and a pump portion that guides the liquid to be handled into the annular space. In the mold pump, a suction casing is provided at the axially open end of the outer cylinder, an impeller is provided between the suction casing and the motor frame side plate, and a sliding member or sliding portion that slides with the impeller suction portion is provided inside. It is characterized in that it is provided in the casing and the inner casing is fixed to the suction casing.

Further, the sheet metal pump casing of the present invention is provided with a suction nozzle at the bottom and a cup-shaped sheet metal suction casing having an open end with a mounting portion for a mating member, and the suction casing is separated in the axial direction. In addition, an inner casing made of sheet metal, which is engaged and fixed in the radial direction and accommodates the impeller, is provided inside thereof.

[0008]

In the first aspect of the all-circumferential flow type pump of the present invention, a guide device for guiding the handling liquid discharged from the impeller is provided with a double body including the motor frame outer body, the motor frame side plate and the outer cylinder. A sliding member provided on the body structure and sliding on the impeller suction portion is fixed to the suction casing. This makes it possible to increase the impeller outer diameter without changing the pump outer diameter. In the all-circumferential flow type pump disclosed in JP-A-5-110081, the impeller outer diameter D ₂ is 80% of the stator outer diameter of the motor, but it is 100% in the embodiment of the present invention. There is. That is, D ₂
Is 1.25 times that of the conventional example, so that the pump discharge head can be increased by 1.25 ² ≈1.6 times. The cost of this type of pump is largely determined by the outer diameter of the motor stator and the corresponding material cost of the motor frame side plate and the like, so the present invention is an important factor in commercialization.

In the present invention, by using the return vane device as the guide device, the outer diameter D ₂ of the impeller can be increased. Further, the impeller outer diameter D ₂ can be increased by providing the guide device between the outer casing of the motor frame and the outer cylinder.

Further, according to the present invention, the return vane device is fixed to the outer cylinder or the motor frame side plate. Therefore, a guide device is not required for the suction casing, and a simple inner casing may be provided on the suction casing. Further, since the deformation of the suction casing due to an external force such as a pipe load is not transmitted to the guide device, the rigidity or welding strength of the guide device (return vane device) may be a low value. Further, compared to the conventional example of Japanese Patent Laid-Open No. 5-110081, in the case of trouble such as foreign matter clogging the impeller, maintenance work can be performed more easily.

Further, by tapering the inlet and outlet of the return vane as in the present invention, the return vane can be constructed compactly without consuming much space in the radial direction.

In one aspect of the present invention, the flow path is formed by abutting the side plate on the impeller side and the side plate on the motor frame which constitute the return vane device. In general,
The side plate on the impeller side that constitutes the return vane device often has a gap with the rotating body on the inner diameter side, and the flow of the handling liquid backflows from this gap, causing a slight decrease in efficiency. In the present invention, since the side plate on the impeller side is brought into contact with the side plate of the motor frame to form the flow path, the efficiency is good.

In another aspect of the present invention, a backflow prevention ring corresponding to the inner diameter portion of the side plate on the impeller side constituting the return vane is provided on the impeller rear surface. Also in this case, the efficiency is high as described above.

In one aspect of the present invention, a sand guard is provided on the main shaft so that foreign matter such as slurry does not enter the rotation chamber of the canned motor. Further in the present invention,
The inner diameter of the return vane device is made larger than the outer diameter of the bearing bracket. When the structure in which the slide bearing is attached to the canned motor via the bracket is selected, the return blade device can be fixed regardless of the bracket insertion when this structure is adopted. Even if the fixing is performed by welding, the bearing can be maintained without any trouble.

In one aspect of the present invention, the guide device is provided between the outer casing of the motor frame and the outer casing. Even with this method, the outer diameter of the impeller can be increased without changing the outer diameter of the pump, so that a relatively high head can be realized even with a single-stage pump.

In one aspect of the present invention, the guide device also serves as a member for fixing the outer casing of the motor frame and the outer casing. Further, in one aspect of the present invention, the guide device is configured to be removable. When a plurality of types of pumps having the same motor unit but different pump performances are manufactured, it is desirable to be able to replace the guide device in conjunction with the replacement of the impeller.

Further, according to one aspect of the present invention, the sliding member is provided in the inner casing, and the sliding member sliding with the impeller suction portion is not directly provided in the suction casing. When it is provided directly, the influence of the pipe load or the like applied to the suction casing propagates to the rotating body, but since it is provided in the inner casing, this can be avoided.

Further, in the present invention, the outer peripheral portion of the inner casing made of sheet metal and the inner diameter portion of the suction casing are fitted together. This structure is suitable because the influence of the piping load is not largely reflected in the cylindrical portion of the cup-shaped casing.

Further, in the present invention, since the inner casing and the suction casing are axially separated from each other, the deformation of the suction casing due to the piping load is less likely to be transmitted to the inner casing.

Further, according to the present invention, since the inner casing is provided with the stopper portion for preventing the seal member interposed between the outer cylinder and the suction casing from being displaced toward the inner diameter side, the inner casing and the stopper are provided. Since it can be made into an integral part, it is also advantageous in terms of cost.

In the present invention, since the engaging portion between the inner casing and the suction casing is protected by the rigid material, the structure is extremely strong against the pipe load and other external forces.

In another aspect of the present invention, a suction casing is provided at the axially open end of the outer cylinder, an impeller is provided between the suction casing and the motor frame side plate, and the impeller suction portion slides. A sliding member or a sliding portion is provided on the inner casing, and the inner casing is fixed to the suction casing. In this case, as a guide device for guiding the flow of the circumferential direction in the axial direction with a small blade outer diameter, a plurality of volute shapes are imparted to the inner casing by press integral molding, or the guide vanes are provided in the inner casing, It is possible to suppress the axial dimension as small as possible and protect the internal parts of the pump from the external force of the pipe load by a simple method.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the full-circulation pump according to the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view showing an all-circumferential flow pump according to the present invention. The full-circulation motor pump shown in this embodiment is composed of a pump casing 1, a canned motor 6 housed in the pump casing 1, and an impeller 8 fixed to a main shaft 7 of the canned motor 6. ing. The pump casing 1 is composed of a pump casing outer cylinder 2, a suction casing 3 and a discharge casing 4 which are connected to both ends of the pump casing outer cylinder 2 by flanges 51 and 52 made of a rigid material. Pump casing outer cylinder 2, suction casing 3
The discharge casing 4 is formed by a metal plate made of stainless steel or the like.

An inner casing 10 holding a liner ring 45 which slides on the impeller suction portion is fixed to the suction casing 3. The inner casing 10 is provided with a stopper portion 10a for preventing the seal member 9 interposed between the outer cylinder 2 and the suction casing 3 from shifting to the inner diameter side. Further, the inner casing 10 and the suction casing 3
Are axially separated.

On the other hand, the canned motor 6 includes the stator 13
A motor frame outer case 14 fitted to the outer peripheral part of the stator 13, motor frame side plates 15 and 16 welded and fixed to both open ends of the motor frame outer case 14, and an inner peripheral part 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 double cylinder is formed between the outer casing 14 of the motor frame and the outer cylinder 2, and an annular flow passage 40 is formed in this portion.

Suction casing 3 and motor frame side plate 1
An impeller 8 is provided between the impeller 8 and the blade 5. A return blade device 11 that constitutes a guide device that guides the handling liquid discharged from the impeller 8 is disposed between the impeller 8 and the annular flow passage 40. The return vane device 11 has a function of guiding the flow from the outer peripheral portion to the axial center side, and has a first side plate 41 on the impeller side, a second side plate 42 on the canned motor side, and return vanes 43 between the side plates 41, 42. It consists of and. Then, by fixing the second side plate 42 to the outer cylinder 2, the return vane device 1
The entire 1 is held in a double barrel construction.

The inlet portion 43a and the outlet portion 43b of the return vane 43 are tapered. The first side plate 41 on the impeller side is in contact with the motor frame side plate 15, thereby forming a flow path communicating with the annular flow path 40.

A terminal case 20 is fixed to the outer casing 14 of the motor frame by welding, and a lead wire is pulled out from a coil inside the outer casing 14 of the motor frame and connected to a power cable in the terminal casing 20. Has become.

As shown in FIG. 1, the terminal case 20 has a cup shape having an open end 20a and a bottom portion 20b. A hole 20c for passing a lead wire is formed in the bottom portion 20b of the terminal case 20.
The periphery of 0c and the outer casing 14 of the motor frame are hermetically welded. The terminal case 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, and the lead wire passage hole 20c is eccentric from the center position of the oval. Therefore, the motor frame outer case 1
It is possible to greatly reduce the flow passage area of the annular flow passage 40 between the outer casing 4 and the outer cylinder 2 or to prevent loss due to collision of the fluid with the terminal case 20.

A hole 2a is formed in the outer cylinder 2,
The terminal case 20 is inserted into the hole 2a, and the outer cylinder 2 and the terminal case 20 are hermetically welded.
An upper cover 41 is fixed to the open end 20a of the terminal case 20. A seat portion 14a having a flat upper surface corresponding to the terminal case 20 is provided on the outer body 14 of the motor frame by welding.
The seating portion 14a may be formed integrally with the motor frame outer body 14 by molding.

Next, the peripheral portion of the bearing 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 has a function as a fixed-side thrust sliding member. On both sides of the radial bearing 22 and the fixed thrust bearing 23, there are a rotary thrust bearing 24 and a thrust collar 2 which are fixed thrust sliding members.
5 are provided. The rotation side thrust bearing 24 is fixed to the thrust disk 26, and the thrust disk 2
6 is fixed via a sand guard 27 by a screw and a nut 28 provided at the end of the main shaft 7.

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 35.
This washer 35 is attached to the end of the spindle 7 through the sleeve 53 and the impeller 8 and the nut 36
Has been fixed by. 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. The inner diameter of the return vane device 11 is set larger than the outer diameter of the bearing bracket 32.

Next, the operation of the all-circumferential flow type pump having the above-mentioned structure will be described. The fluid sucked from the pump suction port 3a is pressurized by the impeller 8 and then guided by the return vane device 11 from the outer peripheral side to the axial center side. Return blade device 11
The fluid guided to the axial center side through the annular flow channel 40 flows into the discharge casing 4 and is discharged from the pump discharge port 4a.

According to the present embodiment, the return vane device 11 for guiding the handling liquid discharged from the impeller 8 is formed into a double-barrel structure composed of the motor frame outer case 14, the motor frame side plate 15, and the outer case 2. Further, a liner ring 45 that slides on the impeller suction portion is fixed to the suction casing 3. This makes it possible to increase the impeller outer diameter without changing the pump outer diameter. In the all-circumferential flow pump disclosed in JP-A-5-110081, the impeller outer diameter D ₂ is 80% of the stator outer diameter of the motor, but in this embodiment it is 100%. That is, since D ₂ is 1.25 times that of the conventional example, the pump discharge head is 1.25 ²
It is possible to increase ≈1.6 times. Further, the return vane device 11 is configured to be fixed to the outer cylinder 2. Therefore, a guide device is unnecessary for the suction casing 3,
It is only necessary to provide the suction casing 3 with the simple inner casing 10. Further, since the deformation of the suction casing due to the external force such as the piping load is not transmitted to the guide device, the rigidity or welding strength of the guide device (return vane device 11) may be a low value.
Further, compared to the conventional example of Japanese Patent Laid-Open No. 5-110081, in the case of trouble such as foreign matter clogging the impeller, maintenance work can be performed more easily.

Further, by tapering the inlet portion 43a and the outlet portion 43b of the return vane 43 as in this embodiment,
The return vane can be constructed compactly without consuming much space in the radial direction. In addition, the side plate 41 on the impeller side and the motor frame side plate 15 which configure the return blade device 11.
The flow path is formed by abutting against each other. In general, the side plate on the impeller side that constitutes the return vane device often has a gap with the rotating body on the inner diameter side, and the liquid to be handled flows backward from this gap, which may cause a slight decrease in efficiency. In this embodiment, the side plate 41 on the impeller side is replaced with the motor frame side plate 1.
Since the flow path is formed by contacting with 5, the efficiency is good.

Further, in this embodiment, the inner diameter of the return vane device 11 is made larger than the outer diameter of the bearing bracket 32. When the structure in which the slide bearing is attached to the canned motor via the bracket is selected, the return blade device 11 is fixed to the bearing bracket 32 when this structure is adopted.
Can be performed independently of the insertion of.

Further, in this embodiment, the liner ring 45 constituting the sliding member is provided in the inner casing 10, and the liner ring 45 sliding with the impeller suction portion is not directly provided in the suction casing 3. There is. When it is provided directly, the influence of the pipe load applied to the suction casing 3 propagates to the rotating body, but since it is provided in the inner casing 10, this can be avoided.

Further, in this embodiment, the outer peripheral portion of the inner casing 10 made of sheet metal and the inner diameter portion of the suction casing 3 are fitted together. This structure is suitable because the influence of the piping load is not largely reflected on the cylindrical portion of the cup-shaped suction casing 3. Since the inner casing 10 and the suction casing 3 are separated from each other in the axial direction, the deformation of the suction casing 3 due to the pipe load is less likely to be transmitted to the inner casing 10.

Further, in this embodiment, the inner casing 1
0 is provided with a stopper portion 10a for preventing the seal member 9 interposed between the outer cylinder 2 and the suction casing 3 from being displaced toward the inner diameter side, so that the inner casing 10 and the stopper 10a are integrated into one piece. This is also advantageous in terms of cost. Further, since the inner casing 10 is formed with the air vent hole 10b, no air can be accumulated between the inner casing 10 and the suction casing 3,
Problems such as air locks do not occur.

FIG. 2 is a sectional view showing a second embodiment of the full-circulation pump of the present invention. 2, components having the same functions and functions as those of FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

This embodiment differs from the embodiment shown in FIG. 1 in the construction of the return vane device, the backflow prevention ring and the sand guard. That is, the return blade device 11 includes the first side plate 61 on the impeller side, the second side plate 62 on the canned motor side,
The return vanes 63 are provided between the side plates 61 and 62. Then, the second side plate 62 is fixed to the outer cylinder 2, so that the entire return vane device 11 is held by the double barrel structure. Inlet 63a and outlet 63b of the return vane 63
Are tapered. Further, the first side plate 61 on the impeller side is not in contact with the motor frame side plate 15. Further, a sand guard 55 is fixed to the main shaft 7 so that foreign matter such as slurry does not enter the rotation chamber of the canned motor 6.

A backflow prevention ring 64 is fixed to the impeller 8. The backflow prevention ring 64 prevents the backflow of the handled liquid from the gap between the first side plate 61 and the main plate of the impeller 8 and prevents the efficiency from decreasing. Other configurations are similar to those of the embodiment shown in FIG. Also in this embodiment, the same effect as that of the embodiment shown in FIGS. 1 and 2 can be obtained.

FIG. 3 is a sectional view showing a third embodiment of the all-circumferential flow type pump of the present invention. 3, constituent elements having the same functions and functions as those of the constituent elements of FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

The present embodiment has the same structure as the embodiment shown in FIG. 2 except for the return vane device. That is, the return vane device 11 of the present embodiment is similar to the embodiment shown in FIG. 2 in that the impeller-side first side plate 61, the canned motor-side second side plate 62, and the return vanes between the side plates 61, 62. And 63. A stay 62a is attached to the second side plate 62. The stay 62a engages with the motor frame side plate 15 and the outer peripheral portion of the second side plate 62 engages with the outer cylinder 2 to return the return blade. The entire device 11 is held in a double barrel construction. Other configurations are shown in FIG.
This is the same as the embodiment shown in FIG. Also in this embodiment, FIG.
The same effects as those of the second embodiment shown in are obtained.

4 and 5 are views showing a fourth embodiment of the all-circumferential flow type pump of the present invention, FIG. 4 is a longitudinal sectional view thereof, and FIG. 5 is an enlarged view of a main part of FIG. 4, constituent elements having the same functions and functions as those of the constituent elements of FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, a guide device is provided instead of the return vane device. That is, the guide device 71 in this embodiment includes the motor frame outer case 14 and the outer case 2.
It is arranged between and. The guide device 71 of this embodiment is not a return vane device but a guide vane. Figure 5
5 is a diagram showing details of the guide device 71 of FIG. 4, and FIG.
5A is a vertical sectional view, FIG. 5B is a side view, and FIG. 5C is a sectional view taken along line V (c) -V (c) of FIG. 5B. The guide device 71 includes a double cylindrical main body 72 and a plurality of guide vanes 73 arranged in the main body 72. The outer peripheral side of the main body 72 is fitted to the outer cylinder 2, and the inner peripheral side is fitted to the motor frame outer case 14. The guide vanes 73 are formed by bending from the inlet side toward the outlet side as shown in FIG. 5 (c). Even with the configuration of the guide device shown in FIGS. 4 and 5, without changing the pump outer diameter,
Since the outer diameter of the impeller can be made large, a relatively high head can be realized even with a single-stage pump.

The guide device 71 also has a function as a member for fixing the outer casing 14 of the motor frame and the outer casing 2. The guide device 71 is connected to the motor frame outer body 14
Also, it is detachably fixed to the motor frame side plate 15. As a result, when a plurality of types of pumps having the same motor section but different pump performances are manufactured, the guide device can be replaced in association with the replacement of the impeller. Other configurations are similar to those of the embodiment shown in FIG. Also in this embodiment,
The same effects as those of the first embodiment shown in FIG. 1 can be obtained.

6 and 7 are views showing a fifth embodiment of the all-circumferential flow type pump of the present invention. FIG. 6 is a longitudinal sectional view thereof, and FIG.
FIG. 7 is an enlarged view of a main part of FIG. 6, constituent elements having the same functions and functions as those of the constituent elements of FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 6, the guide device 81 in this embodiment is fixed to the motor frame side plate 15 with screws 75. 7A and 7B are diagrams showing the details of the guide device 81. FIG. 7A is a side view and FIG. 7B is FIG.
FIG. 7A is a sectional view taken along line VII (b) -VII (b) of FIG. 7A, and FIG. 7C is a view taken along arrow VII (c) of FIG. 7A. The guide device 81 is
A main body portion 82 fixed to the motor frame side plate 15 and a plurality of guide vanes 83 arranged on the outer peripheral portion of the main body portion 82.
It consists of and. The guide vanes 83 are shown in FIG. 7 (c).
As shown in, the curve is formed from the entrance side to the exit side.

In the structure of the guide device shown in FIGS. 6 and 7,
Since the impeller outer diameter can be increased without changing the pump outer diameter, a relatively high head can be realized even with a single-stage pump.

The embodiment shown in FIGS. 1 to 7 is an all-circumferential flow type pump which can cope with a high head by increasing the outer diameter of the impeller, but in the next embodiment, the outer diameter of the impeller is relatively small. A large water volume low head type all-circumferential flow type pump having a relatively large blade width will be described.

8 and 9 are views showing a sixth embodiment of an all-circumferential flow type pump according to the present invention. FIG. 8 is a vertical sectional view of the all-circumferential flow type pump, and FIG. 9 is a main part of FIG. FIG. In this embodiment, the impeller 8 fixed to the main shaft 7 has a smaller impeller outer diameter D ₂ and a larger blade width B ₂ than those of the impeller of the embodiment shown in FIGS. There is. In addition, in the inner casing 10 that holds the liner ring 45 at the inner end,
As a guide device, multiple volute shapes are given by press integral molding.

FIG. 9 is a view showing the details of the inner casing 10. FIG. 9 (a) is a side view, and FIG. 9 (b) is that of FIG. 9 (a).
FIG. 9 is a sectional view taken along line IX (b) -IX (b). Inner casing 10
A protrusion 10d that protrudes inward (hatched portion in FIG. 9A) and a flat portion 10e that does not protrude inward are formed on the inside. A volute is formed by the side wall 10f of the protrusion 10d. The inner casing 10 having the stopper portion 10a and the air vent hole 10b is shown in FIG.
It is similar to the inner casing of the embodiment shown in FIG. Further, a swivel prevention plate 85 is fixed to the protruding portion 10d of the inner casing 10.

According to the present embodiment, by providing the guide device in the inner casing 10, the axial dimension can be minimized, and the internal parts of the pump can be protected from an external force such as a pipe load by a simple method.

10 and 11 are views showing a seventh embodiment of an all-circumferential flow pump according to the present invention. FIG. 10 is a longitudinal sectional view of the all-circumferential flow pump, and FIG. 11 is a main part of FIG. FIG. This embodiment is similar to the embodiment shown in FIG. 8 and FIG.
The inner casing 10 is provided with a plurality of volute shapes as a guide device by press-integral molding.

FIG. 11 is a diagram showing the details of the inner casing 10. FIG. 11 (a) is a side view and FIG. 11 (b) is FIG.
It is the XI (b) -XI (b) sectional view taken on the line of (a). Similarly to the inner casing of FIG. 9, the inner casing 10 is formed with a projecting portion 10d that projects inward (hatched portion in FIG. 11A) and a flat portion 10e that does not project inward. A volute is formed by the side wall 10f of the protrusion 10d. Inner casing 10 is stopper 10a
And having the air vent hole 10b are similar to the inner casing of the embodiment shown in FIG. The effect of this embodiment is shown in FIG.
And the same as the fifth embodiment shown in FIG.

FIG. 12 is a sectional view showing an eighth embodiment of an all-circumferential flow type pump according to the present invention. In this embodiment, the inner casing 10 is provided with guide vanes 91 formed of guide vanes. As a result, the axial dimension can be kept as small as possible, and the internal parts of the pump can be protected from external force such as piping load by a simple method. The operation and effect of this embodiment are similar to those of the fifth embodiment shown in FIGS. 8 and 9.

[0059]

As described above, according to the all-circumferential flow type pump of the present invention, it is possible to increase the impeller outer diameter D ₂ without changing the pump outer diameter, and the high-lift type all-circumferential flow type. A pump can be configured. Further, according to the all-circumferential flow type pump of the present invention, it is possible to configure a large water both low head type all-circumferential flow type pump having a relatively small impeller outer diameter D _{2 and a} relatively large blade width B _2. it can. In this case, as a guide device for guiding the flow of the circumferential direction in the axial direction with a small blade outer diameter, a plurality of volute shapes are imparted to the inner casing by press integral molding, or the guide vanes are provided in the inner casing, It is possible to suppress the axial dimension as small as possible and protect the internal parts of the pump from an external force such as a pipe load by a simple method.

Further, according to the pump casing of the present invention, a pump casing suitable for the above-mentioned all-circumferential flow type pump can be constructed.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of an all-circumferential flow pump according to the present invention.

FIG. 2 is a sectional view showing a second embodiment of an all-circumferential flow pump according to the present invention.

FIG. 3 is a sectional view showing a third embodiment of an all-circumferential flow pump according to the present invention.

FIG. 4 is a sectional view showing a fourth embodiment of an all-circumferential flow pump according to the present invention.

5 is an enlarged view of a main part of FIG.

FIG. 6 is a sectional view showing a fifth embodiment of an all-circumferential flow pump according to the present invention.

FIG. 7 is an enlarged view of a main part of FIG. 6;

FIG. 8 is a sectional view showing a sixth embodiment of an all-circumferential flow pump according to the present invention.

9 is an enlarged view of a main part of FIG.

FIG. 10 is a sectional view showing a seventh embodiment of the full-circumferential flow pump according to the present invention.

11 is an enlarged view of a main part of FIG.

FIG. 12 is a sectional view showing an eighth embodiment of the full-circumferential flow 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 Impeller 10 Inner casing 11 Return vane device 13 Stator 14 Motor frame outer case 15, 16 Motor frame side plate 17 Can 18 Rotor 20 Terminal case 21 , 32 Bearing brackets 22, 33 Radial bearings 23 Fixed-side thrust bearings 24 Rotation-side thrust bearings 40 Annular passages 41, 61 First side plates 42, 62 Second side plates 43, 63 Return vanes 64 Backflow prevention rings 71, 81 Guide devices 72 , 82 Main body 73, 83 Guide vane 91 Guide device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiaki Miyazaki 4-2-1 Motofujisawa, Fujisawa City, Kanagawa Prefecture EBARA Research Institute

Claims (29)

[Claims] 1. A motor frame outer case provided on an outer peripheral part of a stator of a motor, a motor frame side plate provided on an axial end part of the motor frame outer case, and the outer peripheral surface of the motor frame outer case. An all-circumferential flow type pump including an outer cylinder that is fixed to the outer casing of the motor frame and a pump portion that guides a liquid to be handled into the outer space, wherein a suction casing is provided at the axially open end of the outer cylinder. Is provided between the suction casing and the side plate of the motor frame, and a guide device for guiding the handling liquid discharged from the impeller is provided in the double body including the outer casing of the motor frame, the side plate of the motor frame, and the outer cylinder. An all-circumferential flow pump, characterized in that a sliding member that is provided on the body structure and that slides on the impeller suction portion is fixed to the suction casing. 2. The full-circumferential flow pump according to claim 1, wherein the guide device is a return vane device for guiding the flow from the outer peripheral portion to the axial center side. 3. The full-circumferential flow pump according to claim 2, wherein the return vane device is fixed to the outer cylinder. 4. The full-circumferential flow pump according to claim 2, wherein the return vane device is fixed to the motor frame side plate. 5. The full-circumferential flow pump according to claim 2, wherein a taper is provided at a return vane inlet portion of the return vane device. 6. The full-circumferential flow pump according to claim 2, wherein the return vane outlet of the return vane device is provided with a taper. 7. The flow path is formed by abutting a side plate on a side of an impeller and a side plate of a motor frame which constitute the return vane device. All-round pump. 8. The backflow prevention ring corresponding to the inner diameter of the side plate on the impeller side constituting the return vane device is provided on the back surface of the impeller. All-round pump. 9. The motor comprises a canned motor,
The all-circumferential flow type pump according to any one of claims 2 to 6, wherein the main shaft is provided with a sand shelter so that foreign matters such as slurry do not enter the rotation chamber of the canned motor. 10. The inner diameter of the return vane device is larger than the outer diameter of the bearing bracket.
10. A full-circumferential flow pump according to any one of items 1 to 9. 11. The full-circumferential flow pump according to claim 1, wherein the guide device is provided between the outer casing of the motor frame and the outer casing. 12. The full-circumferential flow pump according to claim 11, wherein the guide device is configured to function as a member for fixing the outer casing of the motor frame and the outer casing. 13. The full-circumferential flow pump according to claim 11, wherein the guide device is removable. 14. The inner casing is provided with a sliding member or a sliding portion that slides on the impeller suction portion, and the inner casing is fixed to the suction casing.
An all-circumferential flow pump according to any one of 1. 15. The full-circumferential flow pump according to claim 14, wherein the inner casing and the suction casing are made of sheet metal, and the outer peripheral portion of the inner casing is engaged with the suction casing, and both are fixed by welding. . 16. The full-circumferential flow pump according to claim 15, wherein the inner casing and the suction casing are separated from each other in the axial direction. 17. The inner casing is provided with a stopper portion for preventing the seal member interposed between the outer cylinder and the suction casing from being displaced toward the inner diameter side. An all-circumferential flow pump according to any one of 1. 18. A fixing member made of a rigid material is provided on an outer peripheral portion of the suction casing corresponding to a portion where the inner casing and the suction casing engage with each other, and the outer cylinder and the suction casing are fixed by the member. The full-circumferential flow pump according to any one of claims 15 to 17, which is configured. 19. A motor frame outer case provided on an outer peripheral part of a stator of a motor, a motor frame side plate provided on an axial end part of the motor frame outer case, and the outer peripheral surface of the motor frame outer case. An all-circumferential flow type pump including an outer cylinder that is fixed to the outer casing of the motor frame and a pump portion that guides a liquid to be handled into the outer space, wherein a suction casing is provided at the axially open end of the outer cylinder. And a vane wheel is provided between the suction casing and the motor frame side plate, and a sliding member or a sliding portion that slides on the impeller suction portion is provided in the inner casing, and the inner casing is fixed to the suction casing. A characteristic all-round pump. 20. The all-circumferential flow pump according to claim 19, wherein the inner casing and the suction casing are made of sheet metal, and the outer peripheral portion of the inner casing is engaged with the suction casing, and both are fixed by welding. . 21. The full-circumferential flow pump according to claim 20, wherein the inner casing and the suction casing are separated from each other in the axial direction. 22. The inner casing is provided with a stopper portion for preventing the seal member interposed between the outer cylinder and the suction casing from being displaced toward the inner diameter side. An all-circumferential flow pump according to any one of 1. 23. A fixing member made of a rigid material is provided on an outer peripheral portion of the suction casing corresponding to a portion where the inner casing and the suction casing engage with each other, and the outer cylinder and the suction casing are fixed by the member. The full-circumferential flow pump according to any one of claims 20 to 22, characterized in that. 24. The volute shape is imparted to the inner casing by press molding.
24. The all-circumferential flow pump according to any one of claims 23 to 23. 25. The all-circumferential flow pump according to claim 19, wherein the inner casing is provided with guide vanes by press molding and welding. 26. A cup-shaped sheet metal suction casing having a suction nozzle at the bottom and a mounting portion for mating member at the open end, and the suction casing are axially separated from each other and engaged and fixed in the radial direction. And a sheet metal inner casing having an impeller housed therein. 27. A flange for mounting a mating member is provided at the open end of the suction casing, and a stopper portion for preventing the sealing member used for the flange portion from shifting toward the inner diameter side is provided in the inner casing. 27. The sheet metal pump casing according to claim 26. 28. A fixing member made of a rigid material is provided on an outer peripheral portion of the suction casing corresponding to a portion where the inner casing and the suction casing engage with each other, and the member fixes the counterpart member and the suction casing. 28. The pump casing made of sheet metal according to claim 26, wherein the pump casing is configured. 29. The sheet metal pump casing according to claim 26, wherein an air vent hole is provided in the inner casing.