JP2014194190A - Canned motor pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a canned motor pump that can restrain a decrease in pump efficiency.SOLUTION: In a canned motor pump 1, a restraining part 130 for restraining foreign bodies contained in liquid in a pump chamber 31 from flowing into a clearance between a rotor 80 and a separation plate 41 is provided at an outer periphery of an end part of the rotor 80 on the side of an impeller 70. The outer diameter of the restraining part 130 is made larger than the outer diameter of a magnet 82.

Description

  The present invention relates to prevention of lock of a canned motor pump.

  Conventionally, as a canned motor pump, an impeller provided with a rotor behind the rear shroud, a resin separation plate provided with a storage portion for storing the impeller, and a rotor surrounded by the separation plate And a stator that rotates and drives a rotor by generating a magnetic field is known (see, for example, Patent Document 1).

  In Patent Document 1, by providing a metal plate that is non-magnetic and harder than iron on the inner surface of the separation plate, it is possible to prevent the inner surface of the separation plate from being damaged by foreign matters such as iron powder contained in the flowed liquid. I can do it.

JP2012-202320A

  However, in the conventional configuration described above, a slight gap may be generated between the resin separator and the metal plate provided on the inner peripheral surface of the separator, and the foreign matter contained in the liquid in the gap. Sometimes bite.

  In particular, when a metal foreign matter bites into the gap, the metal plate may be deformed by volume expansion accompanying corrosion of the metal foreign matter due to long-term use. When the deformation of the metal plate becomes large, the metal plate and the outer peripheral surface of the rotor come into contact with each other, and the rotation of the rotor is hindered, which may reduce the pump efficiency.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a canned motor pump capable of suppressing a decrease in pump efficiency.

  In order to solve the above-described conventional problems, a canned motor pump according to the present invention is formed integrally with a rotor having a magnet on an outer peripheral portion and rotatably supported by a shaft, and one end side in the axial direction of the rotor. An impeller, a casing in which a pump chamber for housing the impeller is formed, a stator that is disposed on the outer peripheral side of the rotor and generates a rotating magnetic field for rotating the rotor, the rotor, and the stator And a separation plate on which a storage portion for storing the rotor is formed. And the control part which suppresses that the foreign material contained in the liquid of the pump chamber flows in between the rotor and the separation plate is provided in the outer periphery of the end on the impeller side of the rotor, The outer diameter of the suppression part is larger than the outer diameter of the magnet.

  As a result, foreign matter contained in the liquid in the pump chamber is suppressed from flowing between the rotor and the separation plate, so that the rotor can be kept rotatable for a longer period of time. It can suppress that efficiency falls.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that the pump efficiency of a canned motor pump falls.

1 is a front sectional view of a canned motor pump according to a first embodiment of the present invention. It is a perspective view of the rotor and impeller of the canned motor pump concerning Embodiment 1 of this invention. It is a perspective view of the rotor and impeller concerning the modification of Embodiment 1 of this invention. It is a front sectional view of the canned motor pump according to the second embodiment of the present invention.

  1st invention is equipped with the magnet in the outer peripheral part, and was rotatably supported by the axis | shaft, the impeller integrally formed in the one end side of the said axial direction of the said rotor, and the pump which accommodates the said impeller A casing in which a chamber is formed, a stator that is arranged on the outer peripheral side of the rotor and generates a rotating magnetic field for rotating the rotor, and a storage portion that partitions the rotor and the stator and stores the rotor. In the canned motor pump, the foreign material contained in the liquid in the pump chamber flows between the rotor and the separation plate on the outer periphery of the rotor impeller side end. The suppressing part which suppresses is provided, The outer diameter of the said suppressing part is made larger than the outer diameter of the said magnet.

  As a result, foreign matter contained in the liquid in the pump chamber is suppressed from flowing into the space between the rotor and the separation plate, and the rotor can always be kept rotatable. However, it can suppress that pump efficiency falls.

  According to the second aspect of the invention, in particular, a blade portion that causes a liquid flow to the impeller side is provided on the outer periphery of the suppression portion of the first aspect of the invention.

  As a result, it is possible to generate a flow in the direction opposite to the flow of liquid flowing from the pump chamber toward the storage portion (normal flow), and the flow of liquid between the rotor and the separation plate is suppressed, and the liquid flow is suppressed. It is possible to further suppress the inflow of foreign matter contained in the.

  In the third invention, in particular, a reflux hole for refluxing the liquid between the suppression unit and the impeller of the first or second invention to the pump chamber is formed.

  Thereby, the liquid that has flowed to the rotor side from the impeller can be recirculated to the pump chamber through the recirculation hole, and foreign matter contained in the liquid flows into the space between the rotor and the separation plate. Can be suppressed.

  According to a fourth aspect of the invention, in particular, the reflux hole of the third aspect of the invention is arranged at the axial center side with respect to the outer periphery of the suppressing portion, and is formed at a connecting portion that connects the impeller and the rotor. is there.

  Thereby, the liquid can be recirculated to the center side of the impeller, that is, the suction side of the impeller, and foreign matter contained in the liquid can be prevented from flowing between the rotor and the separation plate. . Furthermore, a reduction in pump efficiency can be further suppressed by returning the liquid to the suction side of the impeller.

  According to a fifth aspect of the invention, in particular, an annular magnet for adsorbing a magnetic substance contained in the foreign matter is disposed at a portion of the separation plate according to any one of the first to fourth aspects of the invention that faces the outer periphery of the impeller. It is a thing.

  As a result, among the foreign substances contained in the liquid, in particular, a magnetic substance such as iron can be adsorbed to the magnet, and the amount of foreign substances contained in the liquid flowing from the pump chamber to the storage section side can be reduced. . As a result, foreign matter contained in the liquid can be further suppressed from flowing into between the rotor and the separation plate.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments. In the following description, the rotational axis direction of the impeller is defined as the front-rear direction, and the suction port side in the rotational axis direction is defined as the front side.

  Moreover, the same component is contained in the following several embodiment. Therefore, in the following, common reference numerals are given to those similar components, and redundant description is omitted.

(Embodiment 1)
1 is a front sectional view of a canned motor pump according to a first embodiment of the present invention.

  A canned motor pump 1 shown in FIG. 1 includes a pump main body 10 that forms an outer shell, and a rotary body 20 that is stored in a rotary body storage chamber 51 formed in the pump main body 10.

  The pump body 10 includes a casing 30 in which a pump chamber 31 that opens to the rear is formed, and a drive block 40 in which a storage portion 41a that opens to the front is formed.

  The drive block 40 is located behind the casing 30. A storage portion 41a (described later) of the drive block 40 communicates with the pump chamber 31 of the casing 30, and the storage portion 41a and the pump chamber 31 constitute a rotating body storage chamber 51 that stores the entire rotating body 20.

  The drive block 40 includes a separation plate 41, a magnetic drive unit 42, a control unit 43, and a mold resin 44 that forms an outline.

  The separation plate 41 is made of a synthetic resin, and can be formed of, for example, a polyphenylene sulfide (PPS) resin. It is also possible to form the separation plate using a metal that does not affect the magnetic drive.

  The separation plate 41 is formed in a container shape that opens to the front, and includes a bottomed cylindrical storage portion 41a whose front surface is open and whose rear surface is closed by a bottom portion 41b, and a front wall portion 41c of the storage portion 41a. And a flange portion 41d projecting radially outward from the edge portion. In the present embodiment, the flange portion 41d is formed over the entire circumferential length of the peripheral wall portion 41c.

  Thus, in the present embodiment, the casing 30 and the separation plate 41 constitute the housing 50 in which the rotating body storage chamber 51 that stores the rotating body 20 is formed.

  A rear shaft fixing portion (shaft support portion) 41e that protrudes forward is formed at the center of the bottom 41b of the storage portion 41a (the back center in the storage portion 41a), and the rear shaft fixing portion 41e includes The rear end portion of the ceramic shaft 60 that rotatably supports the rotating body 20 is fixed.

  The shaft 60 is held by the separation plate 41 so as not to rotate. For example, the contour shape of the rear end portion of the shaft 60 is D-shaped, and the inner peripheral surface of the rear shaft fixing portion 41e is D-shaped corresponding to the rear end portion of the shaft 60, so that the D-shape of the shaft 60 If the rear end portion is fitted into the rear shaft fixing portion 41e, the shaft 60 can be held on the separation plate 41 in a non-rotatable manner.

  The magnetic drive unit 42 is a stator having a stator core 42a formed of an electromagnetic steel plate and a coil 42b wound around the stator core 42a while achieving electrical insulation, and is provided so as to surround the peripheral wall portion 41c of the storage unit 41a. It has been.

  The control unit 43 is a control board that controls the magnetic drive unit 42 and is located behind the separation plate 41 and the magnetic drive unit 42. The control unit 43 is electrically connected to the coil 42 b of the magnetic drive unit 42. When the control unit 43 energizes the coil 42 b of the magnetic drive unit 42, a magnetic field that rotates a magnetic driven unit 80 (described later) of the rotating body 20 is generated in the magnetic drive unit 42.

  The mold resin 44 can be formed of, for example, an unsaturated polyester resin, and is located outside the separation plate 41 and integrally includes the separation plate 41, the magnetic drive unit 42, and the control unit 43.

  The rotating body 20 includes an impeller 70 as a pump unit provided at the front portion, and a magnetic follower 80 provided at the rear portion of the impeller 70. In the present embodiment, the impeller 70 and the magnetic follower 80 are connected via the connecting portion 90. And in this embodiment, the impeller 70, the magnetic follower 80, and the connection part 90 are integrally formed. That is, the impeller 70 is integrally formed on the front portion (one end side in the direction of the shaft 60) of the magnetic follower 80.

  The magnetic follower 80 of the rotating body 20 is accommodated in the accommodating portion 41 a, and the impeller 70 is accommodated in the pump chamber 31.

  The magnetic follower 80 is a rotor that is housed in the housing 41 a and is rotatably supported by a shaft 60.

  The magnetic follower 80 includes a synthetic resin rotor portion 81, a magnet portion 82 provided on the outer peripheral side of the rotor portion 81, and a bearing 83 provided at the center of the rotor portion 81. In the present embodiment, the rotor portion 81 is made of polyphenylene ether (PPE) resin, the magnet portion 82 is a permanent magnet made of ferrite or SmFe, and the bearing 83 is made of a carbon-containing resin sliding material or ceramic. Has been.

  The rotor part 81 has a cylindrical bearing fixing part 81a penetrating in the front-rear direction and a magnet fixing part 81b surrounding the bearing fixing part 81a.

  The bearing fixing portion 81a includes a front small diameter portion 81c and a rear large diameter portion 81d, and a bearing 83 is inserted and fixed inside the small diameter portion 81c having a smaller diameter than the large diameter portion 81d. A shaft 60 is inserted through the bearing 83, and the rotating body 20 is supported by the shaft 60 so as to be rotatable around the front-rear axis.

  The magnet fixing portion 81b is formed in a cylindrical shape, and the front portion of the inner peripheral surface of the magnet fixing portion 81b is integrally connected to the small diameter portion 81c of the bearing fixing portion 81a. A magnet housing groove 81e is formed on the outer peripheral surface of the magnet fixing portion 81b.

  The magnet housing groove 81e houses a magnet portion 82 covered with a stainless steel magnet cover 82a. The magnet cover 82 a may not be provided, and the outer peripheral surface of the magnet unit 82 may be exposed on the outer periphery of the magnetic follower (rotor) 80.

  The magnet portion 82 provided on the outer peripheral portion of the rotor portion 81 is located inside the magnetic drive portion 42, and the peripheral wall portion of the storage portion 41 a of the separation plate 41 is between the magnet portion 82 and the magnetic drive portion 42. 41c is arranged. A gap d1 for allowing rotation of the magnetic driven portion 80 is formed between the magnet portion 82 and the peripheral wall portion 41c.

  FIG. 2 is a perspective view of the rotor and impeller of the canned motor pump according to the first embodiment of the present invention, that is, a rotating body.

  An impeller 70 as a pump unit located in front of the magnetic follower 80 includes a plurality of blade portions 71 provided in the circumferential direction of the impeller 70, a rear shroud 72 covering the rear side of each blade portion 71, and each blade. And a front shroud 73 covering the front side of the portion 71.

  The front end of the rotor portion 81 is connected to the center portion of the rear shroud 72 formed in a disk shape via a connection portion 90. The magnet portion 82, the magnet cover 82a, the bearing 83, and the connection portion 90 are integrally provided with the rear surface shroud 72 and the rotor portion 81 by being inserted into a mold for forming the rear surface shroud 72 and the rotor portion 81. That is, the rear shroud 72 and the magnetic follower 80 are insert molded products.

  The front shroud 73 is composed of a conical portion 73a whose diameter decreases toward the front portion, and a cylindrical portion 73b formed at the front portion of the conical portion 73a. The front portion of the cylindrical portion 73b has a front-rear direction. A penetrating suction port 74 is formed.

  Further, the outer peripheral edge of the front shroud 73 (the outer peripheral edge of the conical portion 73 a) and the outer peripheral edge of the rear shroud 72 are arranged at the same position in the radial direction of the impeller 70. A gap is formed between the outer peripheral edge of the front shroud 73 and the outer peripheral edge of the rear shroud 72.

  The gap communicates with the suction port portion 74 through a flow path 75 formed between the adjacent blade portions 71 between the shrouds 72 and 73, and the discharge portion 76 of the impeller 70 is configured by the gap. Yes.

  Each blade portion 71 is formed in a range from the inner peripheral side of the front shroud 73 to the outer peripheral edge of the front shroud 73 (that is, the outer peripheral edge of the rear shroud 72). The front end of each blade portion 71 is integrally connected to the rear surface of the conical portion 73a of the front surface shroud 73, and each blade portion 71 and the front surface shroud 73 are integrally formed. On the other hand, the rear end of each blade portion 71 is attached to the front surface of the rear shroud 72.

  Each blade 71 applies a radial pressure to the liquid introduced into the flow path 75 via the suction port 74 when the impeller 70 rotates. Thereby, the liquid supplied from the suction port portion 74 to the flow path 75 is sent to the outer peripheral side of the impeller 70 and discharged from the discharge portion 76 to the outer peripheral side of the impeller 70.

  In the present embodiment, the pump chamber 31 is formed on the outer periphery of the circular impeller housing chamber 31a and the impeller housing chamber 31a in a plan view for housing the impeller 70, and provides a pressure increasing effect on the liquid. It is comprised with the volute part 31b of the spiral shape in view. Therefore, the liquid discharged from the discharge part 76 to the outer peripheral side of the impeller 70 is introduced into the volute part 31b, and the pressure is increased in the volute part 31b.

  The casing 30 is made of synthetic resin, and can be formed of, for example, polyphenylene sulfide (PPS) resin. The casing 30 can be made of metal.

  As shown in FIG. 1, the casing 30 is formed in a container shape that opens rearward, and the casing 30 has a wall portion 32 that constitutes the inner peripheral surface of the pump chamber 31. And the rear side of the wall part 32 is made to contact | abut to the front-surface outer periphery edge part of the flange part 41d, and the front side of the accommodating part 41a is covered with the casing 30. FIG.

  The casing 30 is attached to the drive block 40 by attaching the wall portion 32 to the outer peripheral portion including the flange portion 41d of the drive block 40 with a plurality of screws, screws or the like (not shown). At this time, the sealing material 100 is interposed in the joint portion between the casing 30 and the flange portion 41d so that the watertightness of the rotating body storage chamber 51 can be secured.

  Further, the casing 30 is provided with a front shaft fixing portion (shaft support portion) 33 located at the center of the rotating body storage chamber 51, and the front end portion of the shaft 60 is fixed to the front shaft fixing portion 33. Yes.

  In addition, since the shaft 60 is non-rotatably held by the separation plate 41 and the casing 30 and the separation plate 41 are fixed, even if the front end portion of the shaft 60 is not non-rotatably held by the casing 30, The relative rotation of the shaft 60 with respect to the casing 30 is restricted.

  In the present embodiment, the front shaft fixing portion 33 is formed integrally with the casing 30 via a plurality of support ribs 34 extending from the inner surface side of the wall portion 32 of the casing 30 toward the pump chamber 31. The front shaft fixing portion 33 includes a cone-shaped protrusion portion 33a that protrudes toward the front portion, and a cylindrical bearing portion 33b that is connected to the rear portion of the protrusion portion 33a and supports the front end portion of the shaft 60. Has been.

  In FIG. 1, reference numeral 110 denotes a bearing plate that receives a load in the thrust direction applied to the bearing 83, and reference numeral 120 denotes a buffer material that absorbs vibration of the shaft 60 and the like.

  Moreover, in this embodiment, the outer peripheral part of the wall part 32 of the casing 30 is located outside the peripheral wall part 41c of the separation plate 41, and the outer peripheral part of the pump chamber 31 is radially outward from the storage part 41a. Bulges. In this bulging portion, the outer peripheral portion of the impeller 70 protruding in the radially outward direction from the magnetic driven portion 80 is located, and the rear surface of this outer peripheral portion (the rear surface of the rear shroud 72) is the flange portion 41d. It faces the front surface of the inner periphery.

  Further, the wall 32 of the casing 30 is connected to a pipe (not shown) and the like, and a suction pipe 35 that introduces the liquid into the pump chamber 31. A discharge pipe 36 that discharges to the outside (connected pipe or the like) is formed.

  The inside of the suction pipe 35 is a suction path 35a. A suction port 35b communicating with a flow path such as a connected pipe is formed on the upstream side of the suction path 35a, and a suction port 35c facing the suction port portion 74 of the impeller 70 is formed on the downstream side. Is formed.

  In the present embodiment, the suction pipe 35 has a curved shape, and the upstream side extends in a direction intersecting the axis 60 direction, while the downstream side is substantially parallel to the axis 60 direction. It extends to. That is, the suction port 35b opens in a direction intersecting the axis 60 direction (a direction perpendicular to the present embodiment), and the suction port 35c opens on the rear side (the impeller 70 side) in the axis 60 direction. ing.

  Thus, by making the suction pipe 35 into a curved shape, the flow direction of the liquid introduced into the suction path 35a from the suction port 35b changes while flowing from the upstream side to the downstream side of the suction path 35a. Will be.

  In particular, in the present embodiment, the liquid is such that, on the upstream side of the suction passage 35a (in the flow path before bending), the direction intersects the direction of the axis 60 and becomes the front side toward the downstream side. In the downstream side of the suction passage 35a (in the flow passage after being curved), the liquid flows to the rear side in the axial 60 direction.

  That is, the suction pipe 35 is bent at an acute angle so that the downstream side of the suction path 35 a faces the suction port portion 74. At this time, if the suction path 35a is also bent at an acute angle so that the downstream side faces the suction port 74, the flow of the liquid flowing in the suction path 35a changes to an acute angle, and the smooth flow of the liquid is obstructed. Will be.

  However, in the present embodiment, the R portion 35e is formed at the inner bent portion (right side in FIG. 1) of the suction passage 35a so that the liquid flowing in the suction passage 35a can flow more smoothly.

  On the other hand, the inside of the discharge pipe 36 is a discharge path 36a, and a discharge port 36b communicating with a flow path such as a connected pipe is formed on the downstream side of the discharge path 36a. Note that the upstream side of the discharge passage 36a communicates with the volute portion 31b. Further, the discharge port 36b is also opened in a direction intersecting the direction of the axis 60 (a direction perpendicular in the present embodiment).

  Further, in the present embodiment, the suction port 35b and the discharge port 36b are arranged perpendicular to the direction of the axis 60 and arranged on a straight line passing through the axis 60. That is, the suction port 35b and the discharge port 36b are arranged so that the straight line connecting the center of the suction port 35b and the center of the discharge port 36b intersects the straight line passing through the shaft 60 perpendicularly.

  By doing so, the canned motor pump 1 can be attached to a part of the piping arranged linearly.

  Further, on the outer periphery of the suction pipe 35 and the discharge pipe 36, a screw thread 35d and a screw thread 36d are respectively formed, and are connected to the pipe using a nut or the like (not shown).

  The canned motor pump 1 configured as described above is driven by energizing the coil 42b by the control unit 43. When a current flows through the coil 42b, a magnetic field is generated in the magnetic drive unit 42. Then, the magnet portion 82 of the rotating body 20 is attracted and repelled with respect to the magnetic drive portion 42, and the magnetic follower portion 80 rotates around the shaft 60 in the direction of the arrow in FIG. Rotate about an axis 60 extending to

  When the impeller 70 rotates, the liquid introduced into the flow path 75 of the impeller 70 from the suction port 35 c through the suction port portion 74 is discharged from the discharge portion 76 to the outer peripheral side of the impeller 70. The liquid discharged to the outer peripheral side of the impeller 70 is basically introduced into the volute portion 31b, and the pressure is increased in the volute portion 31b. Thereafter, the liquid is discharged to the outside of the canned motor pump 1 through the discharge port 36b in a state where the pressure is increased in the volute portion 31b.

  By the way, a part of the liquid passes through the flange gap d3 between the outer peripheral edge of the rear shroud 72 and the flange 41d of the separation plate 41, flows into the rear of the rear shroud 72, and tries to flow into the storage portion 41a. To do.

  Here, in the present embodiment, it is possible to prevent foreign matters in the liquid from flowing into the storage portion 41a.

  Specifically, foreign matters contained in the liquid in the pump chamber 31 are disposed on the outer periphery of the front end portion (end portion on the impeller 70 side) of the magnetic follower portion (rotor) 80 and the separation plate 41. The suppression part 130 which suppresses flowing in between is provided.

  In the present embodiment, the outer diameter of the magnet fixing portion 81 b disposed at the front end portion (end portion on the impeller 70 side) of the magnetic follower portion (rotor) 80 is made larger than the outer diameter of the magnet portion 82. Then, by making the outer diameter of the magnet fixing portion 81b larger than the outer diameter of the magnet portion 82, the gap d2 between the outer peripheral edge of the magnet fixing portion 81b and the peripheral wall portion 41c is formed between the magnet portion 82 and the peripheral wall portion 41c. It is set to be smaller than the gap d1 between them.

  That is, by providing the restraining part 130 whose outer diameter is larger than the outer diameter of the magnet part 82 on the outer periphery of the front end part of the magnetic driven part 80, foreign substances contained in the liquid in the pump chamber 31 are separated from the magnetic driven part 80 and the separation plate. 41 so that it can be prevented from flowing into the space.

  The gap d2 is preferably set to be 0.5 mm or less.

  Furthermore, in the present embodiment, a reflux hole 91 is formed through which the liquid that has flowed between the suppression unit 130 and the impeller 70 is returned to the pump chamber 31. Specifically, the reflux hole 91 is formed in the connection portion 90 that is disposed closer to the center of the shaft 60 than the outer periphery of the suppression portion 130. Note that a plurality of reflux holes 91 are preferably formed along the circumferential direction of the connecting portion 90.

  As described above, in the present embodiment, the canned motor pump 1 includes the magnetic driven portion (rotor) 80 that includes the magnet portion 82 on the outer peripheral portion and is rotatably supported by the shaft 60, and the magnetic driven portion ( A rotor) 80 and an impeller 70 integrally formed on one end side in the axis 60 direction.

  The canned motor pump 1 also includes a casing 30 in which a pump chamber 31 that houses the impeller 70 is formed.

  A magnetic drive unit (stator) 42 that is arranged on the outer peripheral side of the magnetic driven unit (rotor) 80 and generates a rotating magnetic field for rotating the magnetic driven unit (rotor) 80, a magnetic driven unit (rotor) 80, and And a separation plate 41 that partitions the magnetic drive unit (stator) 42 and is formed with a storage unit 41 a that stores the magnetic driven unit (rotor) 80.

  Further, foreign matter contained in the liquid in the pump chamber 31 is prevented from flowing between the magnetic follower (rotor) 80 and the separation plate 41 on the outer periphery of the end of the magnetic follower (rotor) 80 on the impeller 70 side. The restraining part 130 is provided, and the outer diameter of the restraining part 130 is larger than the outer diameter of the magnet part 82.

  As a result, the foreign matter contained in the liquid in the pump chamber 31 is prevented from flowing between the magnetic follower (rotor) 80 and the separation plate 41, and the magnetic follower (rotor) 80 is always kept rotatable. Will be able to. As a result, even when used for a long period of time, it is possible to suppress a decrease in pump efficiency.

  In addition, a reflux hole 91 for returning the liquid between the suppression unit 130 and the impeller 70 to the pump chamber 31 is formed. Therefore, the liquid that has flowed closer to the magnetic follower (rotor) 80 than the impeller 70 can be recirculated to the pump chamber 31 through the recirculation hole 91, and the foreign matter contained in the liquid is separated from the magnetic follower (rotor) 80. It is possible to further suppress the flow into the separation plate 41.

  In particular, since the reflux hole 91 is formed in the connecting portion 90 that is disposed closer to the shaft 60 center side than the outer periphery of the suppressing portion 130 and connects the impeller 70 and the magnetic driven portion (rotor) 80, the liquid is supplied to the impeller 70. It can be refluxed to the center side, that is, the suction side of the impeller 70 (inside the flow path 75). And the centrifugal force is given to the liquid which the liquid recirculated to the suction side of the impeller 70 by the blade | wing part 71, and it becomes possible to make it discharge outside a pump.

  Thus, by forming the reflux hole 91, the liquid that has flowed between the suppression unit 130 and the impeller 70 can be discharged outside the pump, thereby further suppressing the reduction in pump efficiency. Will be able to.

  That is, according to the canned motor pump 1 of the present embodiment, most of the foreign matter contained in the liquid is discharged to the outside through the discharge port 36b, and the gap between the flange portion 41d of the rear shroud 72 and the flange portion 41d of the separation plate 41. Most of the foreign matter that has passed through d3 and has entered the rear side of the rear shroud 72 is returned to the suction port 74 side through the reflux hole 91.

  Therefore, even if iron-based foreign matters that may adhere to the magnet portion 82 are mixed in the liquid, most of them cannot reach the storage portion 41a. For this reason, it is possible to prevent the iron-based foreign matter from adhering to the magnet portion 82 and inhibiting the rotation of the rotating body 20 or locking it.

  Next, a modified example of the rotating body 20 will be described.

  FIG. 3 shows a perspective view of a rotor and an impeller of a canned motor pump according to a modification of the first embodiment of the present invention, that is, a rotating body.

  The rotating body 20A has basically the same configuration as the rotating body 20 shown in the first embodiment.

  That is, the rotating body 20 </ b> A includes an impeller 70 as a pump unit provided at the front part and a magnetic driven part 80 provided at the rear part of the impeller 70, and the impeller 70 and the magnetic driven part 80. Are connected via a connection unit 90.

  Then, foreign matter contained in the liquid in the pump chamber 31 is prevented from flowing between the magnetic follower (rotor) 80 and the separation plate 41 on the outer periphery of the end of the magnetic follower (rotor) 80 on the impeller 70 side. The restraining part 130 is provided, and the outer diameter of the restraining part 130 is larger than the outer diameter of the magnet part 82.

  Here, the main difference between the rotating body 20A and the rotating body 20 shown in the first embodiment is that a blade portion that causes a liquid flow to the impeller 70 side is provided on the outer periphery of the suppressing portion 130. In the point.

  Specifically, a side blade (blade portion) 84 is disposed in front of the magnetic follower portion (rotor) 80 (one end side in the direction of the axis 60).

  As shown in FIG. 3, the side blades 84 have a shape in which the rear side of the rotating body 20 </ b> A (the arrow direction in FIG. 3) is inclined forward in the direction of the axis 60. And by setting it as such a structure, when the side blade | wing 84 rotates with rotation of the rotary body 20A, the function which tries to flow a liquid forward is produced in the side blade | wing 84. FIG.

  Further, by projecting the side blades 84 outward from the magnet portion 82, the outer diameter of the suppressing portion 130 is made larger than the outer diameter of the magnet portion 82 (see FIG. 3). Thus, in this modification, the side blades 84 are caused to function as the suppression unit and the blade unit. In addition, it is also possible to provide a blade part separately from the suppressing part.

  The canned motor pump 1 configured as described above is driven by energizing the coil 42b by the control unit 43. When a current flows through the coil 42b, a magnetic field is generated in the magnetic drive unit 42. Then, the magnet portion 82 of the rotating body 20A is attracted and repelled with respect to the magnetic drive portion 42, and the magnetic follower portion 80 rotates around the shaft 60, whereby the impeller 70 extends around the shaft 60 extending forward and backward. Rotate to.

  When the impeller 70 rotates, the liquid introduced into the flow path 75 of the impeller 70 from the suction port 35 c through the suction port portion 74 is discharged from the discharge portion 76 to the outer peripheral side of the impeller 70. The liquid discharged to the outer peripheral side of the impeller 70 is basically introduced into the volute portion 31b, and the pressure is increased in the volute portion 31b. Thereafter, the liquid is discharged to the outside of the canned motor pump 1 through the discharge port 36b in a state where the pressure is increased in the volute portion 31b.

  At this time, a part of the liquid passes through the flange gap d3 between the outer peripheral edge of the rear shroud 72 and the flange 41d of the separation plate 41, flows into the rear of the rear shroud 72, and flows into the storage portion 41a. However, by the rotation of the side blades 84 that construct the suppressing unit 130, the liquid is given forward force in the direction of the axis 60. As a result, the inflow of the liquid into the storage portion 41a is suppressed.

  Further, the liquid whose inflow to the storage portion 41a is suppressed is returned to the suction port portion 74 side through the reflux hole 91 of the rotating body 20A, and centrifugal force is again applied by the blade portion 71 to be discharged out of the pump. It becomes possible.

  Thus, also by this modification, the effect | action and effect similar to the said Embodiment 1 can be show | played.

  Moreover, in this modification, the blade | wing part which produces the flow of the liquid to the impeller 70 side is provided in the outer periphery of the suppression part 130. FIG.

  As a result, it is possible to generate a flow in the direction opposite to the flow of liquid flowing from the pump chamber 31 toward the storage portion 41a (normal flow), and to suppress the flow of liquid between the rotor and the separation plate. Inflow of foreign substances contained in the liquid can be further suppressed.

(Embodiment 2)
The canned motor pump 1B according to the second embodiment has basically the same configuration as the canned motor pump 1 shown in the first embodiment.

  FIG. 4 is a front sectional view of a canned motor pump according to the second embodiment of the present invention.

  The canned motor pump 1B includes a magnet portion 82 on the outer peripheral portion, and a magnetic driven portion (rotor) 80 that is rotatably supported by a shaft 60, and one end of the magnetic driven portion (rotor) 80 in the direction of the axis 60. And an impeller 70 formed.

  The canned motor pump 1 also includes a casing 30 in which a pump chamber 31 that houses the impeller 70 is formed.

  A magnetic drive unit (stator) 42 that is arranged on the outer peripheral side of the magnetic driven unit (rotor) 80 and generates a rotating magnetic field for rotating the magnetic driven unit (rotor) 80, a magnetic driven unit (rotor) 80, and And a separation plate 41 that partitions the magnetic drive unit (stator) 42 and is formed with a storage unit 41 a that stores the magnetic driven unit (rotor) 80.

  Further, foreign matter contained in the liquid in the pump chamber 31 is prevented from flowing between the magnetic follower (rotor) 80 and the separation plate 41 on the outer periphery of the end of the magnetic follower (rotor) 80 on the impeller 70 side. The restraining part 130 is provided, and the outer diameter of the restraining part 130 is larger than the outer diameter of the magnet part 82.

  In FIG. 4, an example using the rotator 20 shown in the first embodiment is illustrated, but the rotator 20 </ b> A shown in the modification of the first embodiment can also be used.

  Here, the canned motor pump 1 of the present embodiment is mainly different from the canned motor pump 1 of the first embodiment in that a magnetic substance contained in a foreign substance is located at a portion of the separation plate 41 facing the outer periphery of the impeller 70. It is in the point which arranged the annular magnet which adsorbs.

  Specifically, the ring magnet 140 is disposed on the flange portion 41d of the separation plate 41 so that the ring magnet 140 faces the outer peripheral edge of the rear shroud 72 (the outer periphery of the impeller 70).

  The drive of the canned motor pump 1B having such a configuration is performed by energizing the coil 42b by the control unit 43. When a current flows through the coil 42b, a magnetic field is generated in the magnetic drive unit 42. Then, the magnet portion 82 of the rotating body 20 is attracted and repelled with respect to the magnetic drive portion 42 and the magnetic follower portion 80 rotates around the shaft 60, and thereby the impeller 70 extends forward and backward around the shaft 60. Rotate to.

  When the impeller 70 rotates, the liquid introduced into the flow path 75 of the impeller 70 from the suction port 35 c through the suction port portion 74 is discharged from the discharge portion 76 to the outer peripheral side of the impeller 70. The liquid discharged to the outer peripheral side of the impeller 70 is basically introduced into the volute portion 31b, and the pressure is increased in the volute portion 31b. Thereafter, the liquid is discharged to the outside of the canned motor pump 1 through the discharge port 36b in a state where the pressure is increased in the volute portion 31b.

  At this time, a part of the liquid passes through the flange gap d3 between the outer peripheral edge of the rear shroud 72 and the flange 41d of the separation plate 41, flows into the rear of the rear shroud 72, and flows into the storage portion 41a. However, iron-based foreign matter adheres to the ring magnet 140. Therefore, it is possible to remove as much as possible the iron-based foreign matter contained in the liquid flowing into the rear of the rear shroud 72.

  Further, when a large amount of iron-based foreign matter adheres to the ring magnet 140, the attached iron-based foreign matter serves as a filter, and the clearance of the flange gap d3 becomes smaller, so that non-ferrous foreign matter can also be trapped. Will be able to.

  Thus, also by this embodiment, there can exist the same operation and effect as the above-mentioned Embodiment 1.

  Moreover, according to this embodiment, the ring magnet 140 which adsorb | sucks the magnetic substance contained in a foreign material is arrange | positioned in the site | part facing the outer periphery of the impeller 70 of the separation plate 41. FIG.

  Therefore, among foreign substances contained in the liquid, in particular, a magnetic substance such as iron can be captured by adsorbing to the ring magnet 140, and the foreign substance contained in the liquid flowing from the pump chamber 31 to the storage portion 41a side (magnetic The amount of substance) can be reduced. As a result, it is possible to further suppress foreign matters contained in the liquid from flowing into between the magnetic follower (rotor) 80 and the separation plate 41.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made.

  For example, in each of the above-described embodiments, an example in which the volute portion is provided on the outer periphery of the pump chamber is illustrated, but the volute portion may not be provided.

  Further, in each of the above embodiments, the canned motor pump is illustrated in which the suction pipe and the suction path are curved and can be attached to a part of the piping arranged in a straight line. It is also possible to provide a canned motor pump that is attached to a corner or the like of a pipe bent in an L shape with the suction path substantially coincided with the axial direction.

  Further, the specifications (shape, size, layout, etc.) of the casing, the suction pipe, and other details can be changed as appropriate.

  As described above, the canned motor pump according to the present invention can prevent foreign matter from flowing into the storage chamber even when liquid containing foreign matter flows in. It can also be applied to applications.

1,1B Canned motor pump 25 Magnetic drive unit (stator)
DESCRIPTION OF SYMBOLS 30 Casing 31 Pump chamber 41 Separation plate 41a Storage part 60 Shaft 70 Impeller 80 Magnetic follower part (rotor)
81b Magnet fixing part (suppression part)
82 Magnet (Magnet)
84 Side blades (blade part)
90 Connecting portion 91 Reflux hole 130 Suppressing portion 140 Ring magnet (magnet)

Claims (5)

A rotor provided with a magnet on the outer periphery and rotatably supported by a shaft, an impeller integrally formed on one end side in the axial direction of the rotor, and a casing formed with a pump chamber for housing the impeller And a stator that is arranged on the outer peripheral side of the rotor and generates a rotating magnetic field for rotating the rotor, and a separating plate that partitions the rotor and the stator and has a storage portion that stores the rotor. In a canned motor pump comprising:
On the outer periphery of the end portion on the impeller side of the rotor, a suppressing portion is provided that suppresses foreign matter contained in the liquid in the pump chamber from flowing between the rotor and the separation plate.
The canned motor pump, wherein an outer diameter of the suppressing portion is larger than an outer diameter of the magnet.   2. The canned motor pump according to claim 1, wherein a blade portion for generating a liquid flow toward the impeller side is provided on an outer periphery of the suppression portion.   The canned motor pump according to claim 1 or 2, wherein a reflux hole for refluxing the liquid between the suppression unit and the impeller to the pump chamber is formed. The impeller and the rotor are integrally formed via a connection portion that is disposed closer to the shaft center than the outer periphery of the suppression portion,
The canned motor pump according to claim 3, wherein the reflux hole is formed in the connection portion.   5. The ring magnet according to claim 1, wherein an annular magnet that adsorbs a magnetic substance contained in the foreign matter is disposed in a portion of the separation plate that faces the outer periphery of the impeller. Canned motor pump.

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