JP3078956B2 - All circumferential flow canned motor pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an all-circle flow type canned motor pump, and more particularly to a small, silent all-circle flow type canned motor pump having an annular flow path formed on the outer periphery of a canned motor.

[0002]

2. Description of the Related Art Conventionally, all circumferential flow type pumps for cooling a motor and reducing noise have been known. Also, there is a strong demand for a pump having a so-called non-seal structure without a shaft sealing device such as a mechanical seal, which is met by a canned motor pump or a magnet driven pump. What is most strongly demanded of current pumps is miniaturization. For this reason, a method of increasing the number of rotations of a motor using a frequency converter such as an inverter has been used. Further, as a countermeasure against red water, a stainless steel plate having corrosion resistance in terms of material is manufactured by press forming.

[0003] On the other hand, when looking at pumps in general, there are multi-stage and double-suction type structures mainly due to restrictions on performance, and submersible pumps are generally used in addition to land pumps due to restrictions on use environment. The elements required for the pump have been enumerated above. When summarized again, there are mainly four elements for silent small non-seal red water countermeasures. However, in practice, each element has a separate technical problem. The commercialization of all satisfactory pumps did not remain.

[0004] Therefore, the producer has to separately prepare a wide variety of pumps. As a result, the productivity per single model is hindered, and a high-cost product is pressed against the user.

Next, problems of the prior art will be described in detail for each element. There are two methods to reduce the noise: a method to prevent noise and a method to absorb the generated sound. A specific example of the former is a reduction in the number of rotations. However, in this method, not only the size of the pump section becomes large, but also the size of the motor section becomes large. Therefore, it does not meet the demand for small size and space saving. A specific example of the latter is the installation of a sound absorbing material or a silencer. However, not only does the cost rise, but also, for example, when a sound absorbing material is attached to the motor, the temperature rise of the motor increases, so that a large motor having a margin must be used.

As a technique for solving these problems, there is the all-circumferential flow type pump described above. This type has the effect of absorbing the sound generated by the motor by passing the liquid through the outer periphery of the motor. Further, since the motor can be expected to be cooled by the handling liquid, the size of the motor can be reduced. However, this type has no effect on the sound generated by the pump section. In particular, when the motor is rotated at a high speed by an inverter or the like, the noise generated by the pump unit increases, and the vibration generated by the motor unit may become noise via the pump unit.

The most effective means for reducing the size of the pump section is to increase the rotation speed. In this case, there is a problem of noise as described above. In addition, as the rotation speed increases, the suction performance deteriorates, and in order to satisfy the requirements of large capacity and low head, the so-called specific speed (Ns), which is a guideline in pump design, may become excessive. It is a big problem. When Ns increases, it is necessary to use a three-dimensional impeller with low productivity.

In order to reduce the size of the motor, there are a method of using a high temperature rise value by increasing the insulation class and a method of reducing the temperature rise value by improving the cooling conditions, but all tend to increase the cost. There is. There is also a method of increasing the number of revolutions and decreasing the torque per output to reduce the size of the motor.
In this case, a problem of noise occurs due to an increase in mechanical loss accompanying the increase in speed. Also, in the case where the speed is increased by combining a three-phase induction motor and an inverter, magnetic vibrations are generated in the motor, which often causes noise.

As a problem associated with high speed, bearings must not be forgotten. In general, the life of a bearing decreases as the rotation speed increases. Therefore, for example, when a slide bearing is used, it is necessary to use a hard material having high durability, for example, ceramic. This kind of hard material is generally brittle, and may be cracked if there is a side contact. Therefore, attention must be paid to the processing accuracy and the assembly accuracy. Further, when used at high speed rotation, it is necessary to make the gap between the sliding parts as small as possible in view of the bearing function.

Further, if the clearance between the bearing portions is large, foreign matter in the handling liquid is apt to enter, and the bearing is damaged in a short time. Furthermore, if the gap is large, a minute balance (electrical / magnetic / mechanical) of the rotating body causes vibration in the sliding portion, which may generate noise.
Therefore, extremely high values are required for the processing accuracy and the assembly accuracy described above, which causes an increase in cost.

When the speed is increased to make the pump smaller,
It was mentioned earlier that problems arise in suction performance and specific speed. As a method for solving this, there is a double suction type pump. With this structure, the water volume can be divided into two impellers,
It is suitable for solving the above-mentioned problem. On the other hand, there are a magnet drive pump and a canned motor pump as a non-sealed structure pump, but the former is difficult to constitute a double suction type due to its structure. Also for the latter, the double-suction type is only slightly published in low-power pumps.

Non-seal Non-seal pumps include a magnet drive pump and a canned motor pump, but the former is difficult to construct a double suction type due to its structure. Again, for the latter, the double-suction type is only slightly published in low-power pumps.

Measures against red water As a measure against red water due to corrosion, the use of stainless steel materials is the most common. Of these, the best productivity is obtained by press-forming a stainless steel sheet. However, this method requires dedicated production equipment such as a mold, and therefore, there is no cost merit unless parts are used in large quantities with the same shape and size. In addition, it is important to consider that the structure of the pump is constituted by a simple-shaped part having no core as much as possible. It should be avoided that a conventional pump with a core is made into a press forming pump with the same structure as it is because the productivity is extremely low. In addition, a thin sheet metal part does not have rigidity even if it is sufficiently satisfactory in strength. Therefore, the structure composed of the above components always has a flexible structure accompanied by deformation. Therefore, it is necessary to make the structure such that the main part is not damaged by the deformation. In addition, since noise due to vibration is easily generated,
Care must be taken that there is no propagation of vibration between the parts with load fluctuations and the parts located outside the device. However, there is no actual product that considers the above contents.

Others In addition to the above-mentioned four factors, there are factors of capacity and head. That is, a method of applying a multi-stage pump to the requirements of a small capacity and a high head, and applying a double suction type pump to a requirement of a large capacity and a low head is common.

Conventional pumps have to be pumps having different structures in order to satisfy the above-mentioned respective elements, but each structure has a low commonality and is separately made into a series as an independent model. . As a matter of course, when this kind of pump is manufactured by press-molded parts, there is no cost merit because the number of individual manufactures is limited.

[0016]

SUMMARY OF THE INVENTION The present invention provides a non-seal type all-period flow type canned motor pump which is silent, compact, can cope with a wide range of essential points, and can integrate the models with good productivity. It is intended to be.

[0017]

In order to achieve the above-mentioned object, a first aspect of the all circumferential flow type canned motor pump according to the present invention is to provide an all circumferential flow type canned motor having an annular flow path formed in an outer peripheral portion of the canned motor. In the mold pump, an inner casing that is close to the impeller and forms a sliding portion directly or via a liner ring with the impeller, and an outer casing that surrounds the inner casing are provided.
The outer casing is provided with a suction port for guiding a fluid from the outside of the apparatus, and the inner casing is provided with a guide device for guiding the fluid discharged from the impeller in the axial direction from the centrifugal direction .

According to a second aspect of the all-peripheral flow type canned motor pump of the present invention, in the all-peripheral flow type pump having an annular flow path formed on the outer periphery of the canned motor, the pump is close to the impeller and directly connected to the impeller. Alternatively, an inner casing forming a sliding portion via a liner ring, and an outer casing surrounding the inner casing are provided, a suction port for guiding fluid from outside the device is provided in the outer casing, and an impeller is provided in the inner casing. And a guide device for guiding the fluid discharged from the inner casing, and a heater for maintaining concentricity with the inner casing at the end of the motor.

A third aspect of the all circumferential flow type canned motor pump of the present invention is a motor frame outer body fitted to the outer periphery of a stator, and a motor frame fixedly welded to an open end of the motor frame outer body. An annular flow path is formed between the side plate, the can fitted to the inner peripheral portion of the stator and joined to the motor frame side plate, and an annular flow path is formed between the outer peripheral portion of the motor frame outer body and welded and fixed to the motor frame outer body. With an outer cylinder,
Attachment parts are provided at two open ends of the outer cylinder, mounting parts are provided for holding the handling liquid inside, and a lead wire outlet for power supply connection is provided on the outer periphery of the outer cylinder. An outer casing is attached to at least one of the open ends, and a suction port for introducing a fluid from the outside of the apparatus is provided in the outer casing, and the inside of the outer casing is close to the impeller and directly with the impeller or via a liner ring. An inner casing for forming a sliding portion by means of a motor, a guide device for guiding the fluid discharged from the impeller is provided in the inner casing, and an inner concentricity with the inner casing is maintained on the motor frame side plate. It is characterized by having a wax.

In one embodiment of the present invention, the guide device provided in the inner casing guides the fluid in the centrifugal direction, and does not return the fluid to the shaft center. In addition, the flow in the centrifugal direction is guided in the axial direction, and is smoothly guided to the annular flow path.

Further, in one embodiment of the present invention, the member constituting the casing is made of a sheet metal made of a corrosion-resistant material such as stainless steel.

Still further, in one embodiment of the present invention, the motor is a two-pole three-phase induction motor, and a frequency converter is provided on the input side of the motor to supply electric power having a frequency of 60 Hz or more to the motor. At a rotational speed of 3600 rpm or more.

[0023]

According to the present invention having the above-described structure, the casing is divided into the outer casing and the inner casing, so that the influence of the external force applied to the outer casing is not easily transmitted to the inner casing. And, since the handling liquid is interposed between the outer casing and the inner casing, the vibration generated in the inner casing portion is not easily transmitted to the outer casing. Therefore, even if vibration occurs in the inner casing portion, the whole pump device becomes extremely quiet in combination with the effect of the all peripheral flow type. In addition, the inner casing is less susceptible to the effect of external force and the concentricity with the motor is ensured, so that the gap between the sliding portions of the impeller can be reduced. As a result, the leakage of the handling liquid from the sliding portion is reduced, the pump efficiency is increased, and the effect of reducing the vibration can be expected, and the pump portion can be made quiet. These effects are remarkable especially when the motor portion has a welding structure made of a sheet metal material or the like.

According to the present invention, since the vibration and noise of the pump section can be prevented as described above, the rotation speed of the impeller can be increased. Therefore, the size of the pump section can be reduced. Moreover, since the pump is a full-circulation flow type pump that can cool the canned motor by the handling liquid, the canned motor can be reduced in size and a compact non-sealable pump can be configured as a whole.

In one embodiment of the present invention, the guide device provided in the inner casing guides the fluid in the outer peripheral direction so that the fluid does not return to the axis side. As a result, the space required for returning to the shaft center side can be eliminated, and the pump can be reduced in size. In addition, since the flow in the outer circumferential direction is guided in the axial direction and smoothly guided to the annular flow path, the hydrodynamic loss can be suppressed small, and the pump efficiency can be increased and the effect of reducing vibration can be expected.

In one embodiment of the present invention, an elastic material is interposed at a contact point between the outer casing and the inner casing. As a result, the effect of dividing the outer casing and the inner casing is further improved. That is, the effect that the vibration generated in the inner casing portion is not easily transmitted to the outer casing is promoted.

Further, in one embodiment of the present invention, the outer casing is made of a sheet metal made of a corrosion-resistant material. As a pump material, it is desirable to use a stainless steel material in view of measures against red water, but the cost is higher than a material such as cast iron. Therefore, a thin stainless steel plate is generally used. An advantage of this type of material is that parts can be manufactured with high productivity by press molding. A disadvantage is that even if the strength is sufficient, the rigidity is low, so that it is easily deformed when subjected to an external force. In conventional pumps, the casing deforms,
The structure had an effect on the sliding portion of the impeller. Therefore, in order to impart rigidity to a casing having no rigidity, a reinforcing member is often fixed by welding, which hinders productivity.

Even if this kind of reinforcement is implemented,
The following problems could not be solved. That is, when the casing is in contact with the internal member accompanied by the pressure fluctuation or the casing and the impeller sliding member, the vibration is transmitted to the casing. At this time, if the casing is made of sheet metal, a large noise is caused. In the present invention, as described above, the casing is divided into an outer casing and an inner casing, and the inner casing is supported by the motor. Further, an elastic material is interposed between the outer casing and the inner casing. As a result, since the outer casing has no actual harm even if deformed, it can be manufactured with high productivity without requiring reinforcement.

Further, according to one aspect of the present invention, a bearing bracket for holding a radial bearing and / or a thrust bearing is inserted into a motor room via an elastic material. As a result, the sliding gap of the radial bearing can be made extremely small, and the vibration and noise of the sliding portion can be suppressed low. In addition, since the radial bearing supporting both ends can be moved in the radial direction by the elastic material, the sliding portion is always assembled with uniform concentricity. When the pump is operated at a high speed, the bearing must use a durable hard material, for example, ceramic, but this kind of material is generally brittle. Therefore, there is a risk of cracking if there is a one-sided contact, but in the present invention, since uniform concentricity can be secured,
There is no fear of hitting.

Further, regarding the sliding gap, if the sliding gap is large, vibration is likely to occur due to the electrical, magnetic and mechanical imbalance of the rotating body, especially when used at high speed rotation. This vibration is transmitted to the entire device via the bearing, and causes vibration and noise problems. According to the present invention, since the elastic material is interposed between the bearing bracket and the motor, the vibration can be absorbed.

Further, the present invention provides an in-line type, a double suction type,
It is configured so that a submersible pump can be easily manufactured. Therefore, parts can be shared and productivity is good.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an all-periodic flow canned motor pump according to the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view showing an inline pump to which the present invention is applied. The all circumferential flow type canned motor pump shown in the present embodiment includes a motor unit M and a pump unit P. The motor unit M includes a stator 27, a motor frame outer body 24 fitted on an outer peripheral portion of the stator 27, and motor frame side plates 25 and 26 welded and fixed to an open end of the motor frame outer body 24. And a can 29 fitted to the inner peripheral portion of the stator 27 and fixed to the motor frame side plates 25 and 26 by welding.
And a canned motor having: Also,
A plurality of hollow ribs 24a protruding outward by press molding are provided on the outer peripheral portion of the motor frame outer body 24.

The outer frame 24 of the motor frame and the outer cylinder 9 are welded and fixed at the ribs 24a, and an annular flow path 45 is formed between them. Further, in this embodiment, a hole 24b is provided in the empty rib 24a, and a hole 9c is provided in the outer cylinder 9 correspondingly. Hole 24
The b and the hole 9c are kept watertight from the water pressure applied to the annular flow path by welding. The power supply connection lead wire passes through the holes 24b and 9c, and is housed in a terminal box 38 installed on the outer peripheral portion of the outer cylinder 9c.

Outer flanges 9a and 9b are provided at two axially open ends of the outer cylinder 9 as mounting portions for mounting a mating component and holding a handled liquid inside. ing. The motor frame side plates 25 and 26 are provided on the motor frame side plates 25 and 26 to maintain concentricity with the pump section.
a and 26a are provided respectively. The outer cylinder 9 and the motor frame outer body 24 are both formed of a thin stainless steel plate.

In this embodiment, the flanges 9a and 9b provided at both ends of the outer cylinder 9 have the same shape, and the axial dimension between the end face 25c of the motor frame side plate 25 and the flange 9a is different from that of the motor frame. The end face 26c of the side plate 26 and the flange 9b have the same axial dimension. The rotor 28 is fixed to the main shaft 16 by shrink fitting.
Extending on both sides.

The peripheral portion of the bearing on the side opposite to the thrust load will be described below. The bearing bracket 35 constituting the first bearing bracket is provided with a radial bearing 36 and a fixed-side thrust bearing 37. The end face of the radial bearing 36
A function as a fixed-side thrust sliding member is also provided. On both sides of the radial bearing 36 and the fixed-side thrust bearing 37, a rotating-side thrust bearing 40, which is a rotating-side thrust sliding member, and a thrust collar 41 are provided. The rotation-side thrust bearing 40 is provided with a thrust disc 39.
The thrust disk 39 is fixed by screws and nuts 69 provided at the end of the main shaft 16 via sand guards 66 and washers.

The bearing bracket 35 is inserted through a female ring provided on the motor frame side plate 26 via an O-ring 34 made of an elastic material. Also, the bearing bracket 3
5 is in contact with the motor frame side plate 26 via a gasket 43 made of an elastic material. Reference numeral 38 in the drawing denotes a sleeve that forms a sliding portion with the radial bearing 36.

Next, the peripheral portion of the bearing on the thrust load side will be described below. A radial bearing 32 is provided on the bearing bracket 31 constituting the second bearing bracket. In the figure, reference numeral 33 denotes a sleeve which forms a sliding portion with the radial bearing 32. The sleeve 33 is in contact with a washer 42, and the washer 42 is provided on an end of the main shaft 16 via an impeller 61 or the like. And a nut 69. The outer diameter of the washer 42 is substantially the same as the outer diameter of the radial bearing 32. The bearing bracket 31 is inserted through a female ring provided on the motor frame side plate 25 via an O-ring 30 made of an elastic material. The bearing bracket 31 is in contact with the motor frame side plate 25.

Next, the pump section will be described. Corresponding to the flange 9a at the open end of the outer cylinder 9, a flange 1a is provided at the open end of the suction outer casing 1. The two flanges 9a and 1a are sandwiched by casing flanges 57 and 58, which are separate members, with the seal member 8 interposed therebetween. At this time, bolts 59 and nuts 60 for fastening are used.

The outer suction casing 1 has a suction nozzle 67 at the end opposite to the flange 1a. An impeller 61 is attached to an end of the main shaft 16 on the thrust load side.
A guide device 64 is engaged with the anchor 25a provided on the motor frame side plate 25, and the guide device 64 is engaged with the inner casing 63 with a high degree of concentricity. A liner ring 62 is attached to the inner casing 63,
The liner ring 62 forms a sliding part with the impeller 61. The inner casing 63 and the suction outer casing 1 are separated from each other, and a seal member 6 made of an elastic material is provided in the separated portion.
The sealing member 65 prevents the handling liquid pressurized by the impeller 61 from leaking into the suction portion of the impeller 61.

On the other hand, a flange 5a is provided at the open end of the discharge outer casing 5 corresponding to the flange 9b at the open end of the outer cylinder 9. The flanges 9b and 5a are sandwiched by casing flanges 53 and 54, which are separate members, with the seal member 8 interposed therebetween. At this time, bolts 55 and nuts 56 for fastening are used. The outer discharge casing 5 has a discharge nozzle 68 at an end opposite to the flange 5a. A sand guard 66 is attached to the end of the main shaft 16 on the side opposite to the thrust load.
Note that the suction outer casing 1, the inner casing 63, and the discharge outer casing 5 are all made of stainless steel plates.

Next, a power supply circuit of the in-line pump configured as described above will be described with reference to FIG. The canned motor M arranged in the pump casing is connected to the frequency inverter 90. The frequency inverter 90 is connected to an AC power supply 93 via a smoothing circuit 91 and a rectifier circuit 92. With the above-described configuration, the alternating current of the commercial frequency (50/60 Hz) supplied from the alternating current power supply 93 is rectified by the rectifier circuit 92, smoothed by the smoothing circuit 91, converted to direct current, and inversely converted to alternating current by the inverter 90. By obtaining a high frequency and driving the canned motor M, the rotation speed of the motor can be set to a rotation speed region (3600 rpm or more) of a two-pole motor or more.

Next, the operation of the in-line pump will be briefly described. The fluid sucked from the suction nozzle 67 is guided into the impeller 61. The fluid discharged from the rotating impeller 61 changes its flow direction from the radial direction (centrifugal direction) to the axial direction via the guide device 64 of the inner casing 63,
It flows into a flow path 45 formed between the outer cylinder 9 and the motor frame outer body 24 of the canned motor M, and flows into the discharge outer casing 5 through this flow path 45. Thereafter, the fluid is discharged from the discharge nozzle 68 provided on the outer discharge casing 5.

FIG. 3 is a sectional view showing a multi-stage in-line pump to which the present invention is applied. Two impellers are arranged on the thrust load side. In FIG. 3, components having the same functions and functions as those of FIG. 1 are denoted by the same reference numerals and described. The multi-stage inline pump shown in the present embodiment has two stages of impellers 61A, 61A inside the suction outer casing 1.
B is provided. A first-stage inner casing 63A that houses the first-stage impeller 61A, and a second-stage impeller 61B
And a second-stage inner casing 63B for accommodating the same.

From the first stage impeller 61A to the second stage impeller 61A
Return vanes 70 are provided to direct fluid to B.
Further, a guide device 64 for guiding the fluid discharged from the impeller 61B in the axial direction from the centrifugal direction is provided in the second-stage inner casing 63B. Other functions are the same as those of the in-line pump shown in FIG.

In this embodiment, a multi-stage type is provided by adding one impeller to the in-line pump shown in FIG. 1, and a high head can be ensured. Parts can be shared.

FIG. 4 is a sectional view showing a dual suction pump with legs to which the present invention is applied. 4, components having the same functions and functions as the components of FIG. 1 will be described with the same reference numerals.

4 is provided with a canned motor M at the center, and a vane having a suction portion which is open outward in the axial direction at both axial ends of the main shaft 16 of the canned motor M. Cars 61, 61 are fixed respectively.
A substantially cylindrical suction outer casing 71, 71 for accommodating the impellers 61, 61 is provided. The casings 71, 71 are manufactured by press-forming a steel plate such as stainless steel. They are connected to each other by a cylinder 9. The casings 71, 71 and the outer cylinder 9 are respectively connected to flanges 53, 54;
Has been fixed by.

The outer suction casings 71, 71 have suction nozzles 71a, 71a, respectively.
1a and 71a are connected by a header tube 73. A suction portion 73a is formed at the center of the header tube 73, and a suction port 73b is opened in the suction portion 73a. A suction flange 74 is fixed to the suction portion 73a.

Inside the suction outer casings 71, 71, partition plates 77, 77 for separating the inside of the casings 71, 71 into a suction chamber 75 and a hydrocasing chamber 76, respectively.
Has been fixed.

Inside the partition plates 77, 77, inner casings 63, 63 having guide devices 64, 64 constituting guide vanes or volutes are provided. Further, a discharge nozzle 78 is connected to the center of the outer cylinder 9. In addition, the discharge flange 52 is fixed to the discharge nozzle 78. Other configurations are the same as those of the embodiment shown in FIG.

Next, the operation of the all-peripheral flow type double suction pump configured as described above will be described. The fluid sucked from the suction port 73b is branched right and left by the header tube 73 and flows into the casings 71, 71 from the suction nozzles 71a, 71a. The fluid flowing into the casings 71, 71 is supplied to suction openings 77c, 7 formed in the partition plates 77, 77.
It is guided into the impellers 61, 61 through 7c. Impeller 6
Fluids discharged from the first and the second 61
After the flow direction is changed from the centrifugal direction to the axial direction through the flow passages 4 and 64, the flow flows into a flow passage 45 formed between the outer cylinder 9 and the motor frame outer body 24 of the canned motor M. And the discharge nozzle 7 from the opening of the outer cylinder 9
8, the ink is discharged from the discharge port 78a.

According to this embodiment, since the discharge amount can be divided into two impellers, a large capacity and a low head can be satisfied, and there is no problem in suction performance and specific speed.

FIG. 5 is a sectional view showing a vertical submersible pump to which the present invention is applied. The difference from the embodiment of FIG. 1 is that the short pipe 81 for attaching the underwater cable is welded from the outer peripheral side of the outer cylinder 9 corresponding to the power supply lead hole 9 c provided in the outer cylinder 9. It is fixed and the point that the strainer 82 and the pump stand 83 are attached to the suction outer casing 1.

According to the present embodiment, by providing a strainer on the outer casing of the suction and an underwater cable for supplying power to the canned motor, it is possible to constitute an all-circular flow type submersible pump.

[0056]

As described above, according to the present invention, it is possible to provide a non-sealing pump having a low noise, a small size and a high productivity which can cope with a wide range of essential points.

Further, according to the present invention, an in-line pump, a double-suction pump and a submersible pump can be constructed while using the main structures of the motor section and the pump section in common.
Therefore, the main structure of the pump can be shared and the parts can be shared.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment in which an all circumferential flow type canned motor pump according to the present invention is applied to an in-line pump.

FIG. 2 is a diagram showing a power supply circuit of the in-line pump shown in FIG.

FIG. 3 is a cross-sectional view showing an embodiment in which the all circumferential flow type canned motor pump according to the present invention is applied to a multi-stage in-line pump.

FIG. 4 is a cross-sectional view showing an embodiment in which the all-peripheral flow type canned motor pump according to the present invention is applied to a double suction type pump with legs.

FIG. 5 is a sectional view showing an embodiment in which the all circumferential flow canned motor pump according to the present invention is applied to a vertical submersible pump.

[Explanation of symbols]

 1, 71 (suction) outer casing 1a, 5a, 9a, 9b flange 5 discharge outer casing 8 sealing member 9 outer cylinder 9c, 24b lead wire drawing hole 16 main shaft 24 motor frame outer body 24a empty rib 25, 26 motor frame side plate 25a, 25b, 26a, 26b Influencer 27 Stator 28 Rotor 29 Can 30, 34 O-ring 31, 35 Bearing bracket 32, 36 Radial bearing 33 Sleeve 37 Fixed thrust bearing 38 Sleeve 39 Thrust disk 40 Rotating thrust bearing 45 Annular flow path 51 Suction flange 52 Discharge flange 53, 54, 57, 58 Casing flange 61 Impeller 62 Liner ring 63 Inner casing 64 Guide device 65 Seal member 67 Suction nozzle 68 Discharge nozzle 82 Strainer 83 Pump table 90 circumference Number inverter

──────────────────────────────────────────────────続 き Continuing on the front page (72) Koji Isemoto, Inventor 4-2-1 Motofujisawa, Fujisawa-shi, Kanagawa Inside Ebara Research Institute Co., Ltd. (72) Keita Uei 4-2-2 Motofujisawa, Fujisawa-shi, Kanagawa No. 1 Inside Ebara Research Institute, Inc. (56) References JP-A-48-51301 (JP, A) JP-A-1-301991 (JP, A) JP-A-62-58097 (JP, A) JP-A Sho 52 −112804 (JP, A) Japanese Utility Model Showa 60-188889 (JP, U) Japanese Utility Model Showa 58-46889 (JP, U) Japanese Utility Model Showa 64-49689 (JP, U) Japanese Utility Model Utility Model 38-16955 (JP, Y1) (58) Field surveyed (Int.Cl. ⁷ , DB name) F04D 13/06 F04D 1/08

Claims (14)

(57) [Claims] 1. An all-circumferential flow pump having an annular flow path formed in an outer peripheral portion of a canned motor, wherein an inner casing which is adjacent to the impeller and forms a sliding portion directly with the impeller or via a liner ring is provided. An outer casing surrounding the inner casing, a suction port for introducing a fluid from outside the apparatus is provided in the outer casing, and a guide device for guiding the fluid discharged from the impeller in the axial direction from the centrifugal direction to the inner casing. All-circumferential canned motor pump characterized by having: 2. An all-circumferential pump in which an annular flow path is formed on an outer peripheral portion of a canned motor, wherein an inner casing which is adjacent to the impeller and forms a sliding portion directly with the impeller or via a liner ring is provided. An outer casing surrounding the inner casing, a suction port for guiding fluid from outside the device is provided in the outer casing, a guide device for guiding fluid discharged from the impeller is provided in the inner casing, and an end of the motor is provided. An all-circular flow type canned motor pump, characterized in that a portion is provided with a heater for maintaining concentricity with the inner casing. 3. A motor frame outer body fitted to an outer periphery of a stator, a motor frame side plate welded and fixed to an open end of the motor frame outer body, and the motor frame fitted to an inner periphery of the stator. A can that is joined to the side plate and an outer cylinder that forms an annular flow path between the outer peripheral portion of the motor frame outer body and an outer cylinder that is welded and fixed to the motor frame outer body,
Attach mating parts to the two open ends of the outer cylinder and provide a mounting part for holding the handling liquid inside, and provide a lead wire outlet for power supply connection on the outer peripheral part of the outer cylinder,
An outer casing is attached to at least one of the open ends of the outer cylinder. The outer casing is provided with a suction port for introducing a fluid from outside the apparatus, and is located inside the outer casing near the impeller and directly or in line with the impeller. An inner casing that forms a sliding portion via a ring is provided, and a guide device that guides fluid discharged from the impeller is provided in the inner casing, and the motor frame side plate is kept concentric with the inner casing. All-circle flow type canned motor pump characterized by having an oil stove for it. 4. An annular flow path is formed between an outer cylinder and an outer peripheral portion of a canned motor provided in the outer cylinder, and an outlet for a power connection lead wire is provided on the outer peripheral portion of the outer cylinder. The all circumferential flow type canned motor pump according to any one of claims 1 to 3, wherein the pump is provided. 5. A seal member made of an elastic material for sealing between the inner casing and the outer casing is provided to prevent the liquid which has been pressurized by the impeller from leaking into a suction portion of the impeller. 4. The method according to claim 1, wherein
4. The all circumferential flow type canned motor pump according to any one of 4 . 6. full-circumferential-flow-type canned motor pump according to any one of claims 1 to 5, wherein it is made of sheet metal that the outer casing is made of corrosion-resistant material. 7. A full-circumferential-flow-type canned motor pump according to any one of claims 3 to 6 wherein, characterized in that the outer tube is made of sheet metal comprising a corrosion resistant material. 8. The motor frame outer body is made of sheet metal,
The annular flow path is formed by the motor frame outer body and the outer cylinder, and a hollow rib protruding outward from the motor frame outer body or inward from the outer cylinder is provided by press molding. 8. The all circumferential canned motor pump according to claim 7, wherein said outer cylinder and said motor frame outer body are fitted and fixed. 9. The all circumferential flow type canned motor pump according to claim 8 , wherein a hole for taking out a lead wire for power supply connection is provided in said hollow rib. 10. The outer casing and the outer cylinder each have a flange portion extending outward at an outer peripheral portion of an end portion, and the flange portion is connected by being clamped by another member. The all circumferential flow type canned motor pump according to claim 8 or 9, wherein: 11. The motor according to claim 1, wherein said motor is a two-pole three-phase induction motor, and a frequency converter is provided on the input side of said motor to provide a 60 Hz
The all-circle flow canned motor pump according to any one of claims 1 to 10 , wherein the impeller is rotated at a rotation speed of 3600 rpm or more by supplying electric power having the above frequency to the motor. . 12. opposed each pump inlet and a pump discharge port to both shaft side of the motor, according to any one of claims 1 to 11, characterized in that to form a complete in-line type All circumferential flow type canned motor pump. 13. A double suction pump as a whole by providing a pump suction port on both sides of a main shaft of the motor and providing a pump discharge port on an outer surface of a member forming the annular flow path. The all circumferential flow type canned motor pump according to any one of claims 1 to 11 , characterized in that: 14. An underwater pump as a whole by connecting an underwater cable to a motor lead wire taken out from an outer surface of the member forming the annular flow path and protecting the connection portion in a watertight manner. The all circumferential flow type canned motor pump according to any one of claims 1 to 13 .