JP2011193572A - Canned motor, and canned motor pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform manufacture, disassembly and assembly inexpensively and easily. <P>SOLUTION: A canned motor has a stator 12 accommodating an armature 22 with a conductor 20 wound on a stator core 18 in a stator chamber 52 demarcated with a stator can 24 inside a motor frame 10, and a rotor 16 arranged rotatably on the inner circumference side of the stator can 24 and is equipped with a rotating shaft 14 to output a motive power to outside. A stator can end plate 32 on the anti-load side is fixed to the end on the anti-load side of the stator can 24, and a sealing member 50c is arranged between the stator can end plate 32 on the anti-load side and a member 10b on the fixing side that faces the end plate. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a canned motor in which the outer periphery of the rotor is covered with a thin stator can made of stainless steel or the like so as to isolate the rotor, and in particular, a canned motor that can greatly reduce the cost by simplifying the structure of the stator and The present invention relates to a canned motor pump in which the canned motor and the pump are integrated.

  The canned motor can be operated by isolating the rotor chamber containing the rotor with a stator can without sealing the rotating shaft provided in the rotor with a shaft seal such as a mechanical seal. It has the characteristics of being safe and long-life without worrying about leakage.

  The canned motor is generally used as a canned motor pump integrated with a pump. When the discharge pressure of the canned motor pump is very high, the stator can receives a high internal pressure. For this reason, if the stator can is thin, the stator can easily deforms in the circumferential direction and the axial direction. When the stator can is deformed, for example, a bearing bracket that fixes the stator can and a bearing that is fixed to the bearing bracket are inclined, and problems such as abnormal wear are likely to occur.

  On the other hand, if the stator can is made thick so that the stator can is not easily deformed even if it receives an internal pressure, eddy current loss generated by the rotating magnetic field passing through the stator can increases and motor efficiency is reduced. Further, when the stator can is made thick, the stator can generates heat due to eddy current loss, and as a result, the stator can expands (deforms).

  As a means to solve these problems, a thick-walled cylindrical reinforcement tube is placed on the armature non-fixed portion of the outer surface of the stator can that cannot be supported by the stator core of the armature to prevent deformation of the stator can. It is known (see Patent Document 1 etc.).

JP-A-7-231620

  However, in the conventional example in which the internal pressure received by the stator can is supported by the reinforcing pipe and the stator can is reinforced, it takes a lot of labor to assemble the canned motor while the reinforcing pipe is arranged at a predetermined position. In addition, once the canned motor is assembled, there is a problem that it is particularly difficult to disassemble the stator. In other words, for example, when a motor frame (side plate) with a reinforcing tube attached in advance and a stator can inserted into the stator are welded in a later process, (1) the welding is very troublesome and the stator after welding It is difficult to disassemble and assemble the member. (2) Since the member is thermally deformed during welding, it is necessary to process the joint portion after welding. In particular, when a configuration as described in Patent Document 1 is adopted, (3 ) There is a problem that the motor frame is also in contact with the liquid, that is, the handling fluid is in contact with the motor frame, and the corrosion resistance of the motor frame is required.

  The present invention has been made in view of the above-described conventional problems, and a canned motor that can be manufactured, disassembled and assembled easily at low cost, and a canned motor in which the canned motor and the pump are integrated. The object is to provide a pump.

  According to a first aspect of the present invention, there is provided a stator in which an armature having a conductor wound around a stator core is housed in a stator chamber partitioned by a stator can inside a motor frame, and is rotatable to the inner peripheral side of the stator can. A canned motor having a rotor having a rotating shaft that is arranged and outputs power to the outside, an anti-load side stator can end plate is fixed to an anti-load side end of the stator can, and the anti-load side stator can The canned motor is characterized in that a sealing member is disposed between the end plate and the fixed member facing the end plate.

  As a result, the anti-load-side stator can end plate is fixed to the anti-load-side end portion of the stator can, and the stator can with the anti-load-side stator can end plate fixed is disposed inside the armature incorporated in the motor frame. This makes it possible to easily and quickly assemble and disassemble the stator having the armature and the stator can. In addition, a sealing member is disposed between the anti-load side stator can end plate and the fixed side member facing the end plate, so that welding work between the anti-load side stator can end plate and the fixed side member can be performed. No need for diameter expansion work.

According to a second aspect of the present invention, the outer side of the anti-load side stator can end plate along the axial direction of the rotating shaft is along the axial direction of the rotating shaft of the anti-load side stator can end plate. The canned motor according to claim 1, wherein a gap allowing movement is formed.
As a result, even if the stator can expands and contracts due to stress or heat generation applied to the stator can, even if the anti-load side stator can end plate moves in the axial direction of the rotating shaft as the stator can expands and contracts, the anti-load side The movement of the stator can end plate can be absorbed and allowed in the gap.

According to a third aspect of the present invention, the fixed-side member is configured as a separate body from the motor frame, and is disposed on the counter-output side of the rotating shaft to support the rotating shaft in a rotatable manner. 3. The canned motor according to claim 1, comprising a non-load-side bearing bracket to be fixed.
Thereby, the anti-load side bearing bracket can be separated from the stator can so as not to be affected by the deformation of the stator can, and can be independently fixed to the motor frame.

According to a fourth aspect of the present invention, in the canned motor according to any one of the first to third aspects, a reinforcing pipe is disposed at a portion where the armature is not fixed to the outer peripheral surface of the stator can. is there.
This reduces the wall thickness of the stator can as much as possible to make a highly efficient canned motor with reduced eddy current loss, and attaches the armature non-fixed portion of the outer peripheral surface of the stator can without welding to the portion. It is possible to reinforce with the reinforcing pipe arranged.

The invention according to claim 5 is characterized in that, among the reinforcing pipes, the reinforcing pipes arranged on the side opposite to the load side with the armature interposed therebetween are fixed by inserting end portions into the fixed side members. The canned motor according to claim 4.
As a result, the canned motor can be assembled more easily and quickly by fitting the end portion into the fixed side member and fixing the reinforcing pipe disposed on the side opposite to the load with the armature interposed therebetween.

  According to a sixth aspect of the present invention, a load-side stator can end plate is fixed to the load-side end portion of the stator can, and is configured separately from the motor frame and disposed on the output side of the rotating shaft. The sealing member is arrange | positioned between the load side bearing bracket which fixes the load side bearing which supports a shaft rotatably, and the said load side stator can end plate, The any one of Claim 1 thru | or 5 characterized by the above-mentioned. It is a canned motor of a crab.

  The invention according to claim 7 is the canned motor according to any one of claims 1 to 5, an impeller mounted on an output side end of the rotating shaft of the canned motor, and the impeller inside. A canned motor pump having a pump casing which is housed and fixed to the motor frame.

  According to an eighth aspect of the present invention, the canned motor according to the sixth aspect, an impeller mounted on an output side end portion of the rotating shaft of the canned motor, and the impeller is housed in the motor frame. A canned motor pump, wherein the load-side stator can end plate and the load-side bearing bracket are sandwiched and fixed between the motor frame and the pump casing. It is.

  As a result, the motor frame can be made of an inexpensive non-corrosion resistant material (such as cast iron) without being in contact with the fluid handled by the canned motor pump, and it is inexpensive, highly reliable, highly efficient and recyclable. High motor frame. In addition, the canned motor pump can be easily and simply assembled, and the cost of the canned motor pump can be reduced.

  According to a ninth aspect of the present invention, there is provided a stator in which an armature having a conductor wound around a stator core is housed in a stator chamber defined by a stator can inside the motor frame, and is rotatable to the inner peripheral side of the stator can. A canned motor having a rotor having a rotating shaft that is arranged and outputs power to the outside, a cylindrical first end plate at one end along the axial direction of the stator can, and the other end A disc-shaped second end plate is fixed to each of the motor frame and the motor frame facing the inner peripheral surface of the cylindrical first end plate and the inner peripheral surface of the first end plate or the motor frame. The canned motor is characterized in that a sealing member is disposed between the two members.

  According to the present invention, a stator having an armature and a stator can can be easily and quickly assembled and disassembled, and the welding operation between the anti-load side stator can end plate and the fixed side member facing the end plate is performed. In addition, it is possible to eliminate the need for the diameter expansion operation of the stator can and the stator can, thereby making it possible to manufacture, disassemble and assemble the canned motor at low cost and with ease.

It is sectional drawing which shows only the upper half of the outline of the canned motor of embodiment of this invention. It is sectional drawing which shows only the upper half the outline | summary before the assembly of the stator structure in the canned motor shown in FIG. It is sectional drawing which shows only the outline | summary of the canned motor of other embodiment of this invention. It is sectional drawing which shows only the outline | summary of the canned motor of other embodiment of this invention. FIG. 5 is a cross-sectional view showing only an upper half of the outline before assembly of the stator structure in the canned motor shown in FIG. 4. It is sectional drawing which shows the outline of the canned motor pump which integrated the canned motor and pump of embodiment of this invention only about the upper half. It is sectional drawing which shows only the outline | summary of the canned motor of other embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or corresponding members are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a cross-sectional view showing an outline of a canned motor according to an embodiment of the present invention. The canned motor includes a stator 12 fixed to the inner peripheral surface of the motor frame 10 by shrink fitting or the like, and a rotor 16 having a rotary shaft 14 that outputs power to the outside fitted therein. The stator 12 has an armature 22 in which a conductor (winding) 20 is wound around a stator core 18 in which a magnetic plate material having a substantially cylindrical space on the inner periphery is laminated, and is fixed to an inner peripheral surface of the armature 22. It has a substantially cylindrical stator can 24 made of stainless steel or the like. The rotor 16 includes a rotor core 28 having a permanent magnet 26 embedded therein, and a substantially cylindrical rotor can 30 made of, for example, stainless steel, fixed to the outer peripheral surface of the rotor core 28.

  In this example, an example is shown in which the present invention is applied to an IPM (Internal Permanent Magnet) motor having a permanent magnet in the rotor, but it is needless to say that the present invention can also be applied to an induction motor or an SPM (Surface Permanent Magnet) motor.

  A substantially cylindrical anti-load-side stator can end plate 32 is provided at the end of the stator can 24 on the anti-load side (left side in FIG. 1). The end face of the stator can 24 is opposite to the end face of the anti-load-side stator can end plate 32. Are affixed to each other and welded from the outer peripheral surface side. On the load side of the stator can 24 (right side in FIG. 1), a load-side stator can end plate 34 provided with a through hole in the center of a disk-shaped plate material is disposed inside the through hole of the load side stator can end plate 34. The end portions of the stator can 24 are fitted into the two, and the two contact portions are welded from the end surface side to be fixed. Here, the outer diameter of the anti-load side stator can end plate 32 is equal to or smaller than the outer diameter of the stator can 24.

  For example, a part of the anti-load side stator can end plate 32 is fitted into the stator can 24 and the end face of the stator can 24 and the exposed end portion of the anti-load side stator can end plate 32 from the stator can 24 are arranged. May be welded from the outer peripheral side, and a substantially cylindrical anti-load-side stator can end plate 32 may be fixed to the end of the stator can 24 on the anti-load side.

  The motor frame 10 is formed in a bottomed cylindrical shape that closes the end portion on the side opposite to the load side with the closing plate portion 10a and opens the end portion on the load side, and the closing plate portion 10a extends along the axial direction of the rotary shaft 14. A bearing support portion 10b that protrudes inwardly in a cylindrical shape is provided. An anti-load-side bearing 36 that is disposed on the opposite-to-output side (left side in FIG. 1) of the rotary shaft 14 and rotatably supports the rotary shaft 14 is fixed to the bearing support portion 10b. An anti-load side thrust disk 38 is fixed to the rotary shaft 14 between the rotor 36 and the rotor 16.

  On the other hand, a load-side bearing bracket 40 is fixed to the load-side end portion of the motor frame 10 via a bolt 46, and is disposed on the load-side bearing bracket 40 on the output side (right side in FIG. 1) of the rotary shaft 14. A load-side bearing 42 that rotatably supports the rotary shaft 14 is fixed. Further, a load side thrust disk 44 is fixed to the rotary shaft 14 between the load side bearing 42 and the rotor 16.

  A space is formed between the motor frame 10 and the load side bearing bracket 40, and the load side stator can end plate 34 is clamped by sandwiching the outer periphery of the load side stator can end plate 34 in this space and tightening the bolts 46. The outer peripheral portion is sandwiched and fixed between the motor frame 10 and the load side bearing bracket 40. A sealing member 50a made of, for example, a rubber O-ring is provided between the motor frame 10 and the load-side stator can end plate 34 so as to seal the space between the motor frame 10 and the load-side stator can end plate 34. And a sealing member made of, for example, a rubber O-ring, which seals between the load side bearing bracket 40 and the load side stator can end plate 34 between the load side bearing bracket 40 and the load side stator can end plate 34. 50b is interposed.

  As described above, the stator can 24 is set to such a length that the anti-load side stator can end plate 32 reaches the bearing support portion 10b of the motor frame 10 when the load side stator can end plate 34 is fixed. A concave portion 10c is provided at a position facing the inner peripheral surface of the anti-load side stator can end plate 32 of the bearing support portion 10b, and the anti load side stator can end plate 32 is provided inside the concave portion 10c. A sealing member 50c made of, for example, a rubber O-ring that seals between the bearing support portion 10b and the anti-load side stator can end plate 32 by pressure contact is disposed.

  In this example, the sealing member 50c is provided on the bearing support portion 10b side of the motor frame 10. However, the sealing member 50c may be provided on the anti-load side stator can end plate 32 side. The same applies to the following examples.

  With the above configuration, an airtight stator chamber 52 is formed between the stator frame 24 having the anti-load side stator can end plate 32 and the load side stator can end plate 34 and the motor frame 10, and the armature 22 of the stator 12 is In this stator chamber 52, it is isolated from the outside.

  Between the cover plate portion 10a of the motor frame 10 and the end face of the anti-load side stator can end plate 32, there is a gap S that allows the anti-load side stator can end plate 32 to move along the axial direction of the rotary shaft 14. Is formed. Accordingly, even if the stator can 24 expands and contracts due to heat generation or the like, and the anti-load side stator can end plate 32 moves in the axial direction of the rotating shaft 14 as the stator can 24 expands and contracts, the anti-load side stator The movement of the can end plate 32 can be absorbed and allowed in the gap S.

  In the canned motor of this example, as shown in FIG. 2, first, the armature 22 is fixed to a predetermined position of the motor frame 10 by shrink fitting or the like. On the other hand, in the stator can 24, the anti-load side stator can end plate 32 is fixed to the anti-load side end portion, and the load side stator can end plate 34 is fixed to the load side end portion. Then, the stator can 24 to which the anti-load side stator can end plate 32 and the load side stator can end plate 34 are fixed is inserted toward the inner peripheral surface of the armature 22 with the anti-load side stator can end plate 32 as the insertion end. The sealing member 50c in which the anti-load side stator can end plate 32 is disposed inside the concave portion 10c of the bearing support portion 10b is brought into pressure contact. Thereby, the space between the anti-load side stator can end plate 32 and the bearing support portion 10b is sealed by the sealing member 50c. Next, after the rotor 16 is inserted, the load side bearing bracket 40 is fixed to the motor frame 10 by tightening bolts 46, and as the bolts 46 are tightened, the load side stator can end plate 34 is moved around the outer periphery of the motor. The frame 10 and the load side bearing bracket 40 are clamped and fixed. This completes the stator assembly operation.

  According to this example, the stator 12 having the armature 22 and the stator can 24 can be easily and quickly assembled and disassembled, and the welding operation between the anti-load side stator can end plate 32 and the bearing support portion 10b can be performed. The diameter expansion work of the stator can 24 can be made unnecessary. As a result, the canned motor can be manufactured, disassembled and assembled easily at low cost.

  FIG. 3 shows a canned motor pump according to another embodiment of the present invention. The difference from the canned motor shown in FIG. 1 in this example is as follows. That is, a substantially cylindrical shape is used as the motor frame 10, and the anti-load side bearing bracket 60 is fastened to the end of the motor frame 10 on the anti-load side by fastening the bolts 62. The anti-load side bearing 36 is fixed by 60 bearing support portions 60a. A concave portion 60b is provided on the outer peripheral surface of the bearing support portion 60a, and the bearing support portion 60a and the anti-load side stator can end plate 32 are brought into pressure contact with the anti-load side stator can end plate 32 in the concave portion 60b. A sealing member 50c made of, for example, a rubber O-ring that seals the gap is disposed.

  Further, a clamp ring 64 is provided, and the clamp ring 64 is fixed to the motor frame 10 by tightening bolts 66 so that the outer periphery of the load side stator can end plate 34 and the outer periphery of the load side bearing bracket 40 are connected to the motor frame. 10 and the clamping ring 64 to fix the load side stator can end plate 34 and the load side bearing bracket 40.

  Further, the non-fixed portion of the outer peripheral surface of the stator can 24 where the armature 22 is not fixed, that is, between the stator core 18 of the armature 22 and the load-side stator can end plate 34 and opposite to the stator core 18 of the armature 22. A thick-walled cylindrical load-side reinforcing tube 68a and an anti-load-side reinforcing tube 68b are disposed between the tip of the load-side stator can end plate 32, respectively. Accordingly, the armature non-fixed portion of the stator can 24 is reinforced by the reinforcing pipes 68a and 68b.

  According to this example, the anti-load-side stator can end plate 32, the load-side stator can end plate 34, and the anti-load-side stator can end plate 34 in the state where the anti-load side end of the motor frame 10 is opened without attaching the anti-load side bearing bracket 60. After the stator can 24 with the load side reinforcing pipe 68a attached in advance is arranged at a predetermined position, the anti-load side reinforcing pipe 68b is attached to the stator can 24 by fitting or the like. Thereafter, the anti-load-side bearing bracket 60 is attached to arrange the reinforcing tubes 68a and 68b at predetermined positions. Thereby, the armature non-fixed portion of the outer peripheral surface of the stator can 24 can be reinforced by the reinforcing pipes 68a and 68b that are mounted and arranged without welding to the portion.

  Thus, by configuring the anti-load side bearing bracket 60 separately from the motor frame 10, the anti-load side bearing bracket 60 is separated from the stator can 24 so as not to be affected by the deformation of the stator can 24, and the motor The frame 10 can be fixed independently. In addition, by arranging the reinforcing tubes 68a and 68b in the armature non-fixed portion of the outer peripheral surface of the stator can 24, the thickness of the stator can 24 can be reduced as much as possible, and a highly efficient canned motor with reduced eddy current loss. can do.

  FIG. 4 shows a canned motor according to still another embodiment of the present invention. 3 is different from the example shown in FIG. 3 in that the end of the anti-load side reinforcing tube 68b is fitted into the motor frame 10 and the anti-load side reinforcing tube 68b is fixed to the motor frame 10. . And between the outer peripheral surface of the anti-load side bearing bracket 60 and the motor frame 10 and the inner peripheral surface of the opening for inserting the anti-load side bearing bracket 60, the rotating shaft 14 of the anti-load side stator can end plate 32 is provided. A gap S that allows movement along the axial direction is formed.

  According to this example, as shown in FIG. 5, first, an end portion is fitted into the motor frame 10 to fix the anti-load side reinforcing pipe 68 b to the motor frame 10, and the armature 22 is further fixed to a predetermined position of the motor frame 10. Is fixed by shrink fitting. On the other hand, in the stator can 24, the anti-load side stator can end plate 32 is fixed to the anti-load side end portion, and the load side stator can end plate 34 is fixed to the load side end portion. The load side reinforcement pipe 68a is attached to the surface. The stator can 24 having the anti-load side stator can end plate 32, the load side stator can end plate 34 and the load side reinforcing pipe 68 a is directed toward the inner peripheral surface of the armature 22, and the anti load side stator can end plate 32 is The insertion end is inserted from the load side end portion of the motor frame 10, and the antiload side bearing bracket 60 to which the antiload side bearing 36 is attached is inserted into the motor frame 10 from the antiload side end portion. As a result, the sealing member 50c in which the anti-load side stator can end plate 32 is disposed inside the concave portion 60b of the bearing support portion 60a is brought into pressure contact, and the space between the anti-load side stator can end plate 32 and the bearing support portion 60a is sealed. Sealed with the member 50c. Next, after inserting the rotor 16, the load side bearing bracket 40 is disposed at a predetermined position, and the clamp ring 64 is fixed to the motor frame 10 by tightening a bolt 66. As the bolt 66 is tightened, the load side bearing bracket 40 is fixed. The stator can end plate 34 and the load-side bearing bracket 40 are fixed by sandwiching their outer peripheral portions between the motor frame 10 and the clamp ring 64. This completes the stator assembly operation.

  Thus, the can motor can be assembled more easily and quickly by fitting the end portion into the motor frame 10 and fixing the anti-load side reinforcing pipe 68b to the motor frame 10 in advance.

  FIG. 6 shows a canned motor pump according to an embodiment of the present invention, in which a canned motor and a pump having substantially the same configuration as the canned motor shown in FIG. 5 are integrated. That is, in this canned motor pump, a cylindrical tube having a center hole 14a extending in the axial direction is used as the rotating shaft 14. An impeller 70 is fixed to the output end of the rotating shaft 14, and the periphery of the impeller 70 is surrounded by a pump casing 72 having a suction port 72a and a discharge port (not shown). The load side bearing bracket 40 is located on the back surface of the pump casing 72.

  The pump casing 72 is fixed to the motor frame 10 via bolts 74. As the pump casing 72 is fixed to the motor frame 10, the load-side stator can end plate 34 and the load-side bearing bracket 40 have their outer peripheral portions. Are fixed between the pump casing 72 and the motor frame 10. Between the load side bearing bracket 40 and the pump casing 72, a sealing member 50d made of, for example, a rubber O-ring that seals between the load side bearing bracket 40 and the pump casing 72 is interposed.

  The load-side bearing bracket 40 is provided with a liquid passage 40 a that guides the fluid handled in the pump casing 72 to the inside of the stator can 24, and the bearing support portion 60 a of the anti-load-side bearing bracket 60 has an inside of the stator can 24. There is provided a liquid passage 60c formed of a notch that guides the inflow handling fluid to a space defined between the anti-load side bearing bracket 60 and the end of the rotary shaft 14.

  According to this canned motor pump, the impeller 70 rotates integrally with the rotating shaft 14 as the canned motor is driven, and the handled fluid flows from the suction port 72a to the pump casing 72 as the rotating shaft 14 rotates. The air is sucked into the interior, boosted, and discharged from the discharge port of the pump casing 72 to the outside. Part of the handled fluid that has flowed into the pump casing 72 flows into the interior of the stator can 24 through the liquid passage 40a of the load-side bearing bracket 40 and between the load-side bearing 42 and the rotary shaft 14, After passing through the gap between the stator can 24 and the rotor 16, the liquid passage 60 c of the load side bearing bracket 60, and between the antiload side bearing 36 and the rotary shaft 14, the antiload side bearing bracket 60 and It flows into the space defined between the end of the rotating shaft 14. Then, it returns to the inside of the impeller 70 through the center hole 14 a of the rotating shaft 14.

  According to this canned motor pump, the motor frame 10 can be made of an inexpensive non-corrosion resistant material (such as cast iron) without being in contact with the fluid handled by the canned motor pump, and is inexpensive and highly reliable. The motor frame is highly efficient and highly recyclable. In addition, the canned motor pump can be assembled easily and easily by fixing the load side stator can end plate 34 and the load side bearing bracket 40 by sandwiching the outer peripheral portion between the pump casing 72 and the motor frame 10. As a result, the cost of the canned motor pump can be reduced.

  FIG. 7 shows a canned motor according to another embodiment of the present invention. The difference from the canned motor shown in FIG. 4 in this example is as follows. That is, the canned motor shown in FIG. 7 has a structure in which the load side and the anti-load side of the canned motor having the structure shown in FIG. 4 are interchanged, and on the output side (left side in FIG. 7) of the rotating shaft 14. The load-side bearing bracket 40 that fixes the load-side bearing 42 that supports the rotary shaft 14 rotatably supports the anti-load that rotatably supports the rotary shaft 14 on the non-output side (right side in FIG. 7) of the rotary shaft 14. The anti-load side bearing bracket 60 which fixes the side bearing 36 is each arrange | positioned. The rotating shaft 14 extends through the inside of the load side bearing bracket 40 and extends to the outside, and the side of the anti-load side bearing bracket 60 is attached in substantially the same manner as the clamp ring 64 shown in FIG. It is obstructed by a plate-shaped closing plate 80.

  Further, a substantially cylindrical load-side stator can end plate 34 is provided at the load side (left side in FIG. 7) of the stator can 24, and the center of the disk-like plate material is provided on the non-load side (right side in FIG. 7). The anti-load side stator can end plate 32 provided with a through hole is fixed to each other. The bearing support of the load side bearing bracket 40 is brought into pressure contact with the load side stator can end plate 34 between the inner peripheral surface of the cylindrical load side stator can end plate 34 and the bearing support portion of the load side bearing bracket 40. A sealing member 50c made of, for example, a rubber O-ring that seals between the load portion and the load-side stator can end plate 34 is disposed.

  Thus, even if a structure in which the load side and the anti-load side of the canned motor are switched is employed, the canned motor can be easily and simply assembled, and the cost of the canned motor can be reduced. It should be noted that the canned motor shown in FIG. 1 or FIG. 3 may of course employ a structure in which the load side and the anti-load side of the canned motor are interchanged in substantially the same manner as described above.

  Although the embodiment of the present invention has been described so far, the present invention is not limited to the above-described embodiment, and it is needless to say that the present invention may be implemented in various different forms within the scope of the technical idea.

DESCRIPTION OF SYMBOLS 10 Motor frame 10b Bearing support part 12 Stator 14 Rotating shaft 16 Rotor 22 Armature 24 Stator can 26 Permanent magnet 30 Rotor can 32 Anti-load side stator can end plate 34 Load side stator can end plate 36 Anti load side bearing 38 Anti load side thrust Disc 40 Load side bearing bracket 42 Load side bearing 44 Load side thrust disc 50a, 50b, 50c, 50d Sealing member (O-ring)
52 Stator chamber 60 Anti-load side bearing bracket 60a Bearing support 64 Clamp rings 68a, 68b Reinforcement pipe 70 Impeller 72 Pump casing

Claims (9)

A stator in which a conductor is wound around a stator core is housed in a stator chamber partitioned by a stator can inside the motor frame, and is arranged rotatably on the inner peripheral side of the stator can and outputs power to the outside. In a canned motor having a rotor with a rotating shaft,
An anti-load side stator can end plate is fixed to the anti-load side end of the stator can, and a sealing member is disposed between the anti-load side stator can end plate and a fixed side member facing the end plate. The canned motor characterized by being made.   A clearance is formed outside the anti-load-side stator can end plate along the axial direction of the rotating shaft to allow the anti-load-side stator can end plate to move along the axial direction of the rotating shaft. The canned motor according to claim 1.   The fixed side member is configured separately from the motor frame, and includes a counter load side bearing bracket that is disposed on the counter output side of the rotary shaft and fixes a counter load side bearing that rotatably supports the rotary shaft. The canned motor according to claim 1 or 2.   The canned motor according to any one of claims 1 to 3, wherein a reinforcing pipe is disposed at an armature non-fixed portion of the outer peripheral surface of the stator can.   5. The canned motor according to claim 4, wherein the reinforcing pipe disposed on the side opposite to the load side with the armature sandwiched among the reinforcing pipes is fixed by inserting an end portion into a fixed side member.   A load-side stator can end plate is fixed to the load-side end portion of the stator can. The load is configured separately from the motor frame and disposed on the non-output side of the rotating shaft so as to rotatably support the rotating shaft. The canned motor according to any one of claims 1 to 5, wherein a sealing member is disposed between a load side bearing bracket for fixing a side bearing and the load side stator can end plate. A canned motor according to any one of claims 1 to 5,
An impeller mounted on an output side end of the rotating shaft of the canned motor;
A canned motor pump comprising a pump casing which houses the impeller and is fixed to the motor frame. A canned motor according to claim 6;
An impeller mounted on an output side end of the rotating shaft of the canned motor;
A pump casing that houses the impeller and is fixed to the motor frame;
The canned motor pump, wherein the load side stator can end plate and the load side bearing bracket are fixed by being sandwiched between the motor frame and the pump casing. A stator in which a conductor is wound around a stator core is housed in a stator chamber partitioned by a stator can inside the motor frame, and is arranged rotatably on the inner peripheral side of the stator can and outputs power to the outside. In a canned motor having a rotor with a rotating shaft,
A cylindrical first end plate is fixed to one end portion along the axial direction of the stator can, and a disc-shaped second end plate is fixed to the other end portion, respectively.
A sealing member is disposed between the inner peripheral surface of the cylindrical first end plate and the motor frame facing the inner peripheral surface of the first end plate or a member fixed to the motor frame. A canned motor.

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