JPH08177782A - Double suction pump - Google Patents

Abstract

PURPOSE: To provide a double suction pump by which the thrust direction is stabilized in a reduced space and convection of a handling liquid in a rotary body chamber becomes excellent and remaining water at drain time is reduced without stagnating air and from which uneven abrasion of a radial bearing is eliminated. CONSTITUTION: In a pump assembling body in which a passage is arranged in an outer peripheral part of a motor stator 13 and which is used by being installed so that the axis of a main shaft 7 becomes almost vertical, impellers 8A, 9A and 8B, 9B are respectively arranged on the lower shaft end and the upper shaft end of a motor 6.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art As a conventional full-circulation type double-suction pump of this type, the one described in Japanese Patent Laid-Open No. 6-74197 is known. Known examples of the double-suction pumps are those described in Toits Patent Publication DE 1,653,692 and British Patent Publication GB 2,007,770. The above conventional example is a horizontal pump in which all main shafts are arranged in the horizontal direction.

However, there is a strong demand for space saving in this market, and a horizontal pump is not suitable from this viewpoint. In other words, except for the one with extremely small output, the total length of the pump is extended in accordance with the laminated thickness of the motor core, so that it is necessary to take a large installation space (floor area).

Further, this type of horizontal pump has the following problems. 1) Since the axial thrust (thrust) is almost balanced, a thrust bearing with a large load capacity is not necessary, but since the direction of the thrust is unstable, problems such as vibration may occur in the rotating body. 2) The convection of the liquid to be handled in the rotating body chamber becomes insufficient, which may cause cooling failure. 3) Due to the structure of the horizontal type, there are many parts where air can be trapped in the pump part, so it is necessary to perform air removal when priming water. Along with this, it is necessary to provide a large number of air vent valves. In this case, if the air is not removed, problems such as deterioration of pump performance and poor lubrication of the bearing occur. 4) Due to the structure of the horizontal type, residual water is likely to be generated during drainage,
Problems such as freeze cracking are likely to occur. 5) With respect to radial bearings, uneven wear may occur due to the weight of the rotating body, resulting in a long-term malfunction.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, the present invention is space-saving, the thrust direction is stable, the convection of the liquid to be handled in the rotor chamber is good, air is not accumulated, and the drainage is reduced. It is an object of the present invention to provide a double-suction pump that has less residual water and does not have uneven wear of radial bearings.

[0006]

In order to achieve the above object, in one embodiment of the vertical double suction pump of the present invention, a flow path is provided in the outer peripheral portion of the stator of the motor, and the axis of the main shaft is substantially vertical. In the pump assembly thus installed and used, the impellers are provided at the lower shaft end and the upper shaft end of the motor, respectively.

Further, one embodiment of the full-circulation pump of the present invention is
A pump configured to include a motor frame outer case provided on an outer peripheral portion of a stator of a motor and an outer cylinder forming an annular space between the outer peripheral surface of the motor frame outer case, and configured to introduce a handling liquid into the annular space. In the assembly, the pump portion is arranged at the shaft end of the motor, the suction case and the suction window for guiding the suction liquid to the outer peripheral portion of the outer cylinder are provided, and the discharge case and the discharge case for guiding the discharge liquid to the outer peripheral portion of the outer cylinder are also provided. A discharge window is provided, and further, a pump suction port is provided in the suction case, and a pump discharge port is provided in the discharge case.

[0008]

According to the present invention, the vertical double suction pump is constructed by providing the outer peripheral portion of the stator of the motor with the flow passage and the impellers at the lower shaft end and the upper shaft end of the motor, respectively.
Installation space can be reduced compared to the horizontal type. Further, since a downward force acts on the rotating body by its own weight, even if the thrust direction caused by the pressure balance is unstable,
Since the force due to its own weight is generally larger, the rotating body is not mechanically unstable.

Further, since the motor is composed of a canned motor, the rotating body chamber is a cylinder having a vertical axis, so that the convection is good and, for example, the handled liquid whose temperature has risen due to the heat radiation of the motor is rotated. It does not stay in a part of the body chamber. That is, the liquid whose temperature has risen and whose specific gravity has decreased is moved to the upper rotor chamber, and further mixed with the main flow of the pump to be heat-exchanged.

Regarding air venting, all the air accumulated in the main body at the time of priming can be removed by an air vent valve (plug) provided at the top of the device. For horizontal type,
At least one air vent valve is required for each of the pump portions provided at both shaft ends, and the vertical type is advantageous in this respect.

Further, in the case of drainage, since the drainage plug provided at the bottom of the apparatus can almost completely drain water, there is no problem such as freeze cracking. Further, with respect to the radial bearing, the load due to its own weight of the rotating body is not applied, and in particular, when the radial load of the hydro portion is balanced as in the embodiment, the radial bearing does not cause uneven wear substantially.

According to the present invention, since the bearing for receiving the downward force of the rotating body is provided in the upper rotating body chamber, the rotating body can be supported on the upper side, so that the stability of the rotating body is improved. high. In particular, the pump having the structure shown in FIGS. 5 and 6 (although this structure is suitable for high pushing applications), a compressive load is applied to the shaft, which is disadvantageous in structural strength. At this time, by providing the thrust bearing in the upper rotary body chamber, the compression load can be reduced by the own weight of the rotary body below the thrust bearing.

According to the present invention, a stirring blade is provided at the suction port of the upper impeller. In this structure, the only problem of concern is that due to some reason such as cavitation, air is trapped at the top of the device, leading to problems such as airlock. At this time, the airlock can be quickly released by providing the stirring blade.

According to the present invention, in a full-circulation type double suction pump, a hole is made in the main shaft to improve the convection of the liquid to be handled.
This improves the cooling of the motor and the lubrication of the bearings. In addition, it is possible that air is easily collected at the shaft center due to the centrifugal action of the rotating body, resulting in poor lubrication of the bearing, but by providing a hole in the shaft, air is sucked in and discharged to the impeller suction part. You can also

The pressures of the two rotor chambers sandwiching the rotor may differ from time to time. For example, in the embodiment shown in FIGS. 1 and 2, the pressure in each rotor chamber is determined by the discharge pressure supplied from the impeller rear surface side, but the pressure reducing action related to the impeller rear clearance is It is assumed that the impellers are not the same. In this case, if the liquid to be handled satisfactorily flows between the two rotary body chambers through the gap between the rotor and the stator, the pressures of the two rotary body chambers will be the same and no trouble will occur.

However, the rotor and the stator slide at a high relative speed while maintaining a narrow gap. In this case, the amount of the handled liquid moving through the gap is generally extremely small. Therefore, the pressures of the two rotary body chambers are different. At this time, thrust is generated on the shaft because the load pushing the side surface of the rotor is different. This thrust is unstable due to its generation factor (impacted by the rear clearance of the impeller), and causes vibration and other troubles. In this case, by making a hole in the shaft so as to connect the two rotor chambers, it is possible to maintain the same pressure and prevent the above problem.

In the pump of this structure, since there is a partition wall separating the suction pressure side and the discharge pressure side on the inner peripheral side of the outer cylinder, there is no degree of freedom in the axial position where the pump suction port or the pump discharge port is provided. For example, in the embodiment shown in FIGS. 1 and 2, the height of the discharge port from the floor surface (center height) is due to the above reason.
Will become bigger. This is an important issue for some users. In order to solve this, in one embodiment of the present invention shown in FIGS. 3 and 4, a discharge case is provided outside the discharge window, and a discharge port is provided in the discharge case. by this,
It is possible to provide a vertical full-circumferential flow pump having a low center height.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a full-circulation type double suction pump according to the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a vertical sectional view of an all-circumferential flow type double suction pump of the present invention, and FIG.
FIG. 11 is a sectional view taken along line II-II. The full-circulation double-suction pump shown in FIGS. 1 and 2 is constructed as a vertical pump. Both suction pumps are provided with a canned motor 6 in the center of the pump casing 1, and impellers 8A, 9A; 8B having suction portions axially outwardly opened at both shaft ends of a main shaft 7 of the canned motor 6. , 9B are fixed. A stirring blade 105 is fixed to the suction port of the upper impeller 8B.

The pump casing 1 comprises an outer cylinder 2 made of stainless steel plate, and covers 63A, 63B made of stainless steel plate which are connected to both ends of the outer cylinder 2 by flanges 51, 52 and flanges 53, 54, respectively. There is. The flange 54 is integrally formed with a leg 54a for standing the pump. Also the upper cover 6
3A is equipped with a plug 100 for venting air,
A drain pipe 101 is attached to the lower cover 63B. A drain plug 102 is attached to the tip of the pipe 101.

On the other hand, the canned motor 6 includes a 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. An annular passage 40 is formed between the motor frame outer case 14 and the outer cylinder 2. Openings 7a, 7b are formed in the main shaft 7 so as to sandwich the motor therebetween, and these openings 7a, 7b are connected by a communication hole 7c provided inside the main shaft. Communication hole 7
c is open at the lower shaft end. And the openings 7a, 7b
Also, the upper rotary body chamber 107 and the lower rotary body chamber 108 are communicated with each other through the communication hole 7c.

A terminal case 20 (see FIG. 2) is fixed to the outer casing 14 of the motor frame. The canned motor 6 and the outer cylinder 2 are the terminal case 20 and the stay 4.
It is fixed integrally with 3. The outer cylinder 2 has suction windows 2a and 2b near both ends, and these suction windows 2a and 2b are provided.
Are connected by a suction cover 55. The suction cover 55 is formed with a pump suction port 55a and has a suction flange 56 fixed thereto.

A case 77 for housing the inverter 76 is welded and fixed to the outside of the outer cylinder 2. Wiring for power supply is provided from the inverter 76 to the stator 13 via the terminal case 20. Inside the outer cylinder 2, inner casings 65, 65 for accommodating the impellers 8A, 9A; 8B, 9B are arranged. Inner casing 65,
Reference numeral 65 denotes cylindrical members 65a and 65a and covers 65b and 65b.
To form a substantially cylindrical container, and cylindrical members 65a, 65a
The seal members 75, 75 made of an elastic material are fixed to one side of the cover 65b, 65b, and the suction openings 65c, 65c are provided in the covers 65b, 65b.
Are formed. The seal members 75, 75 prevent the handled liquid on the discharge side from leaking to the suction side.

The inner casings 65, 65 are provided with bolts 6
6 are connected to the motor frame side plates 15 and 16, respectively. Then, in each inner casing 65,
Holding member 4 holding liner rings 45, 45, respectively
6, 46, return vanes 47, 47 for guiding the fluid discharged from the first-stage impeller 8A or 8B to the second-stage impeller 9A or 9B, and the second-stage impeller 9A or 9B. Device 4 for guiding the fluid discharged from the axial direction from the radial direction
8 and 48 are provided.

An annular flow passage 40 is formed between the outer cylinder 2 and the outer casing 14 of the motor frame. Further, as shown in FIGS. 1 and 2, a discharge window 2c is formed in the outer cylinder 2 and a discharge nozzle 68 is connected thereto. A discharge flange 69 is fixed to the discharge nozzle 68.

Next, the bearing peripheral portion on one side of the main shaft will be described. The bearing bracket 21 includes a radial bearing 2
2 and a fixed thrust bearing 23 are provided. The end surface of the radial bearing 22 also has a function as a fixed-side thrust sliding member. A rotary thrust bearing 24 and a rotary thrust bearing 25, which are rotary thrust sliding members, are provided on both sides of the radial bearing 22 and the fixed thrust bearing 23, respectively. The rotary thrust bearing 24 is fixed to the thrust disk 26, and the rotary thrust bearing 25 is fixed to the thrust disk 27.

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

Next, the bearing peripheral portion on the other side of the main shaft will be described. The bearing bracket 32 is provided with a radial bearing 33. In the figure, 34 is a sleeve that forms a sliding portion with the radial bearing 32, and the sleeve 34 contacts the washer 35, and this washer 35 is the impeller 9A and the sleeve 4.
It is fixed by a screw and a nut 36 provided at the end of the main shaft 7 via 2 and the impeller 8A. The bearing bracket 32 is inserted into a spigot provided on the motor frame side plate 15 via an O-ring 37 made of an elastic material. The bearing bracket 32 is in contact with the motor frame side plate 15.

Next, the operation of the full-circulation type double suction pump constructed as described above will be described. The fluid sucked from the pump suction port 55a is branched left and right by the suction cover 55 and flows into the pump portion through the suction windows 2a and 2b. The fluid flowing into the pump portion passes through the suction openings 65c, 65c formed in the inner casings 65, 65, and the impellers 8A, 8A.
A; boosted by 9B and 9B. The fluid discharged from the impellers 9A and 9B is formed between the outer cylinder 2 and the motor frame 14 of the canned motor 6 after the flow direction is changed from the centrifugal direction to the axial direction via the guide devices 48 and 48, respectively. The liquid flows into the annular flow path 40, and merges while flowing in the flow path 40, and is discharged from the discharge port 2 through the discharge nozzle 68 from the discharge window 2c of the outer cylinder 2.

According to the present invention, a flow path is provided in the outer peripheral portion of the stator 13 of the motor, and impellers 8A, 9A; 8B, 9B are provided at the lower shaft end and the upper shaft end of the motor, respectively. Since it is composed of a suction pump, it can save the installation space compared to the horizontal type. Also, due to its own weight, the main shaft 7 and the rotor 1
8. Since a downward force acts on a rotating body composed of an impeller and the like, even if the thrust direction generated by pressure balance is unstable, the force due to its own weight is generally larger. Will not be unstable.

Further, since the motor is composed of a canned motor, the rotor chambers 107 and 108 have a cylindrical shape with a vertical axis, so that the convection is good and, for example, the temperature rises due to the heat radiation of the motor. The liquid does not stay in a part of the rotor chamber. That is, the liquid whose temperature has risen and whose specific gravity has decreased is moved to the upper rotary body chamber 107, and further mixed with the main flow of the pump to be heat-exchanged.

Regarding the air venting, all the air accumulated in the main body at the time of priming can be removed by the plug 100 constituting the air vent valve provided at the top of the apparatus. In the case of the horizontal type, at least 1 each should be attached to the pump parts provided on both shaft ends.
This requires a number of air vent valves, and the vertical type is advantageous in this respect. At the time of draining, since the drain plug 102 provided at the bottom of the apparatus can drain water almost completely, there is no problem such as freeze cracking. Regarding radial bearings,
When the load due to the own weight of the rotating body is not applied and the radial load of the hydro portion is balanced, as in the embodiment, the radial wear of the radial bearing does not substantially occur.

According to the present invention, the thrust bearings 22, 23, 24, 25 for receiving the downward force of the rotating body are provided in the upper rotating body chamber 107, so that the rotating body is supported on the upper side. Therefore, the stability of the rotating body is high.

In the present invention, the stirring blade 105 is provided at the suction port of the upper impeller 8B. In this structure, the only problem of concern is that due to some reason such as cavitation, air is trapped at the top of the device, leading to problems such as airlock. At this time, the stirring blade 1
By providing 05, the airlock can be quickly released.

According to the present invention, in the all-circumferential double-suction pump, holes 7a, 7b, 7c are opened in the main shaft 7 to improve the convection of the handled liquid. This improves the cooling of the motor and the lubrication of the bearings. In addition, it is possible that air is easily collected at the shaft center due to the centrifugal action of the rotating body, resulting in poor lubrication of the bearing, but by providing a hole in the shaft, air is sucked in and discharged to the impeller suction part. You can also

Further, the pressures of the upper and lower rotary body chambers 107 and 108 provided at two places sandwiching the rotor may differ from time to time. For example, in the embodiment shown in FIGS. 1 and 2, the pressure in each rotor chamber is determined by the discharge pressure supplied from the impeller rear surface side, but the pressure reducing action related to the impeller rear clearance is It is assumed that the impellers are not the same. In this case, the rotor 18
Through the gap between the rotor and the stator 13, the two rotor chambers 10
If the liquid to be handled circulates sufficiently between 7 and 108, the pressures in the two rotor chambers will be the same and no trouble will occur.

However, the rotor 18 and the stator 13 slide at a high relative speed while maintaining a narrow gap.
In this case, the amount of the handled liquid moving through the gap is generally extremely small. Therefore, the pressures of the two rotary body chambers are different. At this time, since the load pressing the side surface of the rotor 18 is different, thrust is generated on the shaft. This thrust is unstable due to its generation factor (impacted by the rear clearance of the impeller), and causes vibration and other troubles. In this case, the two rotor chambers 107,
By opening holes 7a, 7b, 7c in the shaft so as to connect 108, the pressure can be kept the same and the above-mentioned inconvenience can be prevented.

The vertical double-suction pump of this structure has a side surface where the upper side is easily air-locked. However, even if the upper side is air-locked, the discharge pressure water generated by the lower-side pump flows backward in the upper pump, so that the air-lock is released. Therefore, even if the stirring blade 105 is not attached, there is no problem in most cases.

3 and 4 are views showing another embodiment of the double-suction pump of the present invention. FIG. 3 is a vertical sectional view of a full-circulation double-suction pump, and FIG. 4 is IV- of FIG. FIG. 4 is a sectional view taken along line IV. In this embodiment, the discharge case 11 is provided outside the discharge window 2c.
0 is provided, and the ejection nozzle 111 is connected to the ejection case 110. A discharge flange 112 is fixed to the discharge nozzle 111.

In the pump of this structure, since the partition wall composed of the inner casing 65 and the seal member 75 for separating the suction pressure side and the discharge pressure side is provided on the inner peripheral side of the outer cylinder 2, the pump suction port or the pump discharge port is provided. There is no freedom in the axial position to be set. For example, in the embodiment shown in FIGS. 1 and 2, the height of the discharge port from the floor surface (center height) becomes large for the above reason. This is an important issue for some users. In order to solve this, in one aspect of the present invention shown in FIGS. 3 and 4, the discharge case 1 is provided outside the discharge window 2c.
10 is provided, and the discharge case 110 is provided with a discharge port.
As a result, it is possible to provide a vertical all-round pump having a low center height.

Next, still another embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a vertical sectional view of an all-circumferential flow pump of the present invention, and FIG. 6 is a sectional view taken along line VI-VI of FIG. The full-circulation type double-suction pump of this embodiment has a pump casing 1
A canned motor 6 is provided at the center of the inside, and impellers 8C, 9C; 8D, 9D having suction portions that open inward in the axial direction are fixed to both shaft ends of a main shaft 7 of the canned motor 6, respectively. There is. The pump casing 1 includes an outer cylinder 2 made of a stainless steel plate and flanges 51, 51 on both ends of the outer cylinder 2.
52 and flanges 53 and 54, respectively, and covers 63A and 63B made of stainless steel plates. The flange 54 is integrally formed with a leg 54a for standing the pump. Further, an air vent plug 100 is attached to the upper cover 63A, and a drain pipe 101 is attached to the lower cover 63B. A drain plug 102 is attached to the tip of the pipe 101.

The canned motor 6 has the same structure as the canned motor of the embodiment shown in FIG. 1, but a guide member 80 having radial flow passages in the motor frame side plates 15 and 16.
Is added. Also, impellers 8C, 9C; 8D, 9
The inner casings 85, 85 for accommodating D are made of a substantially cylindrical container-shaped integral member, and one end thereof is fitted and fixed to the guide members 80, 80. Also, the inner casings 85, 8
5, the seal members 75, 75 made of elastic material
Has been fixed. The seal members 75, 75 prevent the handled liquid on the discharge side from leaking to the suction side. The bottom of the inner casing 85, 85 in the shape of a cylindrical container and the cover 63
Stays 87, 87 are interposed between the A and 63B.

Further, in the inner casings 85, holding members 46 and 4 holding the liner rings 45 and 45, respectively.
6 and a return blade 4 that guides the fluid discharged from the first-stage impeller 8C or 8D to the second-stage impeller 9C or 9D.
7, 47 and return vanes 48, 48 for guiding the fluid discharged from the second-stage impeller 9C or 9D inward in the radial direction.

A pump suction port 2 is provided at the center of the outer cylinder 2.
e is formed and the suction nozzle 89 is connected. A suction flange 90 is fixed to the suction nozzle 89. The outer cylinder 2 has discharge windows 2f and 2g near both ends, and these discharge windows 2f and 2g are connected by a discharge cover 91. At the center of the discharge cover 91, a pump discharge port 91a is formed and a discharge nozzle 92 is fixed. The discharge nozzle 92 has a discharge flange 9
3 is fixed. Other configurations are the same as those of the embodiment shown in FIGS.

Next, the operation of the full-circumferential flow type double suction pump configured as described above will be described. The fluid sucked from the pump suction port 2e is branched leftward and rightward in the annular flow path 40 and is guided through the guide members 80, 80 to the left and right first-stage impellers 8C, 8D.
Is sucked into. The fluid discharged from the first-stage impellers 8C and 8D passes through the return vanes 47 and 47 to the second-stage impeller 9
Inflow into C and 9D, where the pressure is increased and return vanes 48 and 4
8 through the discharge openings 85a, 85a of the inner casing 85
Is discharged more. Then, the fluid discharged from the discharge openings 85a and 85a flows into the discharge cover 91 through the discharge windows 2f and 2g of the outer cylinder 2, and then the pump discharge port 91.
It is discharged from a.

Also in this embodiment, the same effect as that of the embodiment shown in FIGS. 1 and 2 can be obtained. Further, in the pump of the present embodiment (the present structure is suitable for high pushing applications), a compressive load is applied to the main shaft 7, which is disadvantageous in structural strength. At this time, by providing the thrust bearings 22, 23, 24, 25 in the upper rotary body chamber 107, the compression load can be reduced by the own weight of the rotary body below the thrust bearing.

[0046]

As described above, according to the present invention,
Space-saving, stable thrust direction, good convection of handled liquid in the rotor chamber, no air accumulation, little residual water when draining, and double suction pump with no radial wear of radial bearing can do.

[Brief description of drawings]

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

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

FIG. 3 is a vertical cross-sectional view showing another embodiment of the full-circulation double-suction pump according to the present invention.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a vertical cross-sectional view showing still another embodiment of the full-circulation double-suction pump according to the present invention.

6 is a sectional view taken along line VI-VI of FIG.

[Explanation of symbols]

1 Pump Casing 2 Outer Cylinder 6 Canned Motor 7 Main Spindle 8A, 8B, 8C, 8D, 9A, 9B, 9C, 9D Impeller 13 Stator 14 Motor Frame Outer Body 15, 16 Motor Frame Side Plate 17 Can 18 Rotor 20 Terminal Case 21, 32 Bearing bracket 22, 33 Radial bearing 23 Fixed-side thrust bearing 24 Rotation-side thrust bearing 40 Annular passage 43 Stay 45 Liner ring 47, 48 Return vane 55 Suction cover 63 Cover 65, 85 Inner casing 75 Seal member 80 Guide member 91 Discharge Cover 101 Plug 102 Drain Plug 105 Stirring Blade 107, 108 Rotor Chamber

Front page continuation (72) Inventor Koji Isemoto 4-2-1 Motofujisawa, Fujisawa-shi, Kanagawa Inside EBARA Research Institute, Inc. (72) Inventor Keita Uei 4-2-1 Motofujisawa, Fujisawa-shi, Kanagawa Incorporated EBARA Research Institute, Inc. (72) Inventor Yoshiaki Miyazaki 4-2-1 Honfujisawa, Fujisawa City, Kanagawa Incorporated EBARA Research Institute

Claims (8)

[Claims] 1. A pump assembly, which is installed and used such that a flow path is provided in an outer peripheral portion of a motor, and a main shaft has a substantially vertical axis, and is used at a lower shaft end and an upper shaft end of a motor, respectively. Vertical double-suction pump with an impeller. 2. A canned motor is used as the motor, and a self-lubricating type plain bearing is used.
Vertical double suction pump described in. 3. The vertical double-suction pump according to claim 1, wherein a bearing for receiving the downward force of the rotating body is provided in the upper rotating body chamber. 4. The vertical double suction pump according to claim 1, wherein a stirring blade is provided at a suction port of the upper impeller. 5. A double suction pump having a flow passage provided on an outer peripheral portion of a motor stator and impellers provided on both shaft ends of the motor, wherein the motor is a canned motor and a self-lubricating slide bearing is used. At the same time, an opening hole is provided in at least two places on the outer surface of the main shaft, and the opening hole is connected by a communication hole provided inside the main shaft. 6. The motor according to claim 5, wherein two of the openings are provided with a motor therebetween.
Double suction pump described in. 7. The method according to claim 5, wherein two of the opening holes are provided in each of the two rotary body chambers.
Or the double-suction pump according to item 6. 8. A motor frame outer body provided on an outer peripheral portion of a stator of a motor, and an outer cylinder forming an annular space between the outer peripheral surface of the motor frame outer body, and guiding a handling liquid to the annular space. In the pump assembly configured as described above, a pump portion is arranged at the shaft end of the motor, and a suction case and a suction window for guiding suction liquid to the outer peripheral portion of the outer cylinder are provided,
An all-circumferential flow type pump characterized in that a discharge case and a discharge window for guiding discharge liquid to the outer peripheral portion of the outer cylinder are provided, a pump suction port is provided in the suction case, and a pump discharge port is provided in the discharge case.