US20070280837A1 - Vortex pump - Google Patents

Vortex pump Download PDF

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Publication number
US20070280837A1
US20070280837A1 US11/755,304 US75530407A US2007280837A1 US 20070280837 A1 US20070280837 A1 US 20070280837A1 US 75530407 A US75530407 A US 75530407A US 2007280837 A1 US2007280837 A1 US 2007280837A1
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United States
Prior art keywords
motor stator
impeller
structural component
case structural
component
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/755,304
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English (en)
Inventor
Takeshi Ozawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nidec Instruments Corp
Original Assignee
Nidec Sankyo Corp
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Filing date
Publication date
Application filed by Nidec Sankyo Corp filed Critical Nidec Sankyo Corp
Assigned to NIDEC SANKYO CORPORATION reassignment NIDEC SANKYO CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OZAWA, TAKESHI
Publication of US20070280837A1 publication Critical patent/US20070280837A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D5/00—Pumps with circumferential or transverse flow
    • F04D5/002—Regenerative pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps
    • F04D13/0633—Details of the bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps
    • F04D13/064—Details of the magnetic circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/628—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for liquid pumps

Definitions

  • the present invention relates to a vortex pump in which a fluid sucked through a suction port by revolution of an impeller passes through a fluid path and gets discharged from a discharge port; and furthermore in detail, the invention relates to such a vortex pump provided with a structure that enables the vortex pump to become further low-profile designed.
  • a vortex pump described in Japanese Unexamined Patent Publication (Kokai) No. 2003-161284 includes: an impeller in which a large number of blades are formed at an outer circumference and a rotor magnet is placed at an inner circumference; a shaft on which the impeller revolves; a motor stator that is placed at an inner circumference side of the rotor magnet; and a pump casing that divides the impeller and the motor stator air-tightly and has a suction port and a discharge port.
  • the vortex pump is provided with a motor structure including a structure of an outer rotor. In the vortex pump, the impeller and the motor stator are combined together and air-tightly divided so as to materialize compact design and low-profile design.
  • the present invention aims at solving the problem identified above, and it is a primary object of the present invention to provide a vortex pump equipped with a structure that enables the vortex pump to further become low-shaped.
  • a vortex pump of the present invention includes: an impeller that has a plurality of blades at an outer circumference and a rotor magnet placed at an inner circumference; a shaft fixed at a center of the impeller; a bearing component placed at an outer circumference of the shaft; a motor stator placed at an inner circumference side of the rotor magnet; and a case structural component having a suction port and a discharge port that works to house the impeller and furthermore to divide the impeller and the motor stator; wherein a motor stator side surface of the case structural component is covered with an adhesive material to cause the motor stator to adhere to the motor stator side surface.
  • the motor stator adhered and fixed with an adhesive material onto a surface of the case structural component that faces the motor stator.
  • the motor stator is equipped with a protruded pole part in which a wire-wound coil is formed, and at least all the wire-wound coil is adhered and fixed with an adhesive material onto a surface of the case structural component that faces the motor stator.
  • all the wire-wound coil and the protruded pole part adhered and fixed with an adhesive material onto a surface of the case structural component that faces the motor stator.
  • the motor stator side surface of the case structural component is covered with the adhesive material, or the motor stator is adhered and fixed onto the surface of the case structural component at the side of the motor stator. Therefore, even if thickness of a section of the case structural component that divides the impeller and the motor stator is thin, sympathetic vibration of the case structural component can be restrained. As a result, compact design and low-profile design of the vortex pump can be achieved.
  • a thrust-direction wall a wall in a thrust direction of the case structural component that constructs the surface section (hereinafter called a thrust-direction wall) is thin enough so as to be at least 0.2 mm and thinner than 1.5 mm, noise generation because of sympathetic vibration of the thin-walled thrust-direction wall caused with micro vibration during revolution of the impeller can be restrained and then low-profile design can be realized as an entire profile of the pump. As a result, a low-shaped vortex pump can be provided while securing stable revolution of the pump for a long time.
  • a vortex pump of the present invention is especially effective when thickness of a wall of the case structural component at a side, which divides the impeller and the motor stator, (the thrust-direction wall) is at least 0.2 mm and thinner than 1.5 mm.
  • the bearing component is a ball bearing, and a circular protruded section centered at the shaft is placed at an outer circumference section, which is outside a position including an outer race of the ball bearing and at a lower surface of a motor stator side of the impeller.
  • a ball bearing is used as the bearing component, and the ball bearing is effective for preventing any play from arising. Furthermore, since a circular protruded section centered at the shaft is placed, it is possible for a space surrounded by the protruded section and the shaft to retain a lubricant material for the ball bearing, such as grease and so on, without evaporation or scattering away. As a result, a low-shaped vortex pump can be provided while securing stable revolution of the pump for a long time.
  • a lid component placed on the case structural component that houses the impeller is welded onto the case structural component.
  • a mounting structure for placement of the lid component is not a conventional screw-fastening structure using an O-ring, which is disadvantageous to low-profile design, so that an entire profile of the vortex pump can be low-profiled.
  • another vortex pump relating to the present invention includes: an impeller that has a plurality of blades at an outer circumference and a rotor magnet placed at an inner circumference; a shaft fixed at a center of the impeller; a bearing component placed at an outer circumference of the shaft; a motor stator placed under the impeller and at an inner circumference side of the rotor magnet; and an integral-type case structural component having a suction port and a discharge port which works to house the impeller, and furthermore in which the motor stator is embedded.
  • the motor stator is equipped with a protruded pole part in which a wire-wound coil is formed, and all the wire-wound coil and the protruded pole part are embedded with a resin material so as to construct the integral-type case structural component.
  • a vortex pump In a vortex pump according to the present invention, even if the thickness of the thrust-direction wall that constructs a surface of the case structural component at the motor stator side is thin, noise generation because of sympathetic vibration of the thin-walled thrust-direction wall caused with micro vibration during revolution of the impeller can be restrained and then low-profile design can be realized as an entire profile of the pump. Therefore, a low-shaped vortex pump can be provided while securing stable revolution of the pump for a long time. As a result, the pump can be used preferably as a low-shaped pump with a long operation life for cooling down a CPU of a portable device, such as a notebook-sized personal computer and so on, as well as for a fuel battery.
  • a vortex pump of the present invention is not limited to the example of the preferred embodiment described below as far as the vortex pump has technical characteristics of the present invention.
  • FIG. 1 is an exploded perspective view showing an example of a vortex pump relating to the present invention
  • FIG. 2 is an A-A cross-sectional drawing of the vortex pump shown by FIG. 1 ;
  • FIG. 3 includes perspective views of a case structural component, which is a constitutional element of the present invention, when it is viewed from a side of a motor stator;
  • FIG. 4 is an explanatory drawing to show an example of adhesive joining configuration of an adhesive material that covers a surface at a side of the motor stator of the case structural component;
  • FIG. 5 is an explanatory drawing to show another example of adhesive joining configuration of an adhesive material that covers a surface at a side of the motor stator of the case structural component;
  • FIG. 6 is an explanatory drawing to show an example of a configuration including an integral-type case structural component in which the motor stator is integrated and embedded;
  • FIG. 7 is an explanatory drawing to describe a preload given onto the bearing component constructed by using the couple of ball bearings that are stacked up.
  • FIG. 1 is an exploded perspective view showing an example of a vortex pump relating to the present invention
  • FIG. 2 is an A-A cross-sectional drawing of the vortex pump shown by FIG. 1 when it is in assembled condition.
  • FIG. 3 includes perspective views of a case structural component, which is a constitutional element of the present invention, when it is viewed from a side of a motor stator; and meanwhile, FIG. 4 and FIG. 5 are explanatory drawings showing condition of adhesive joining configuration of an adhesive material that covers a surface at a side of the motor stator of the case structural component.
  • a vortex pump 1 of the present invention is a pump in which a fluid (gas or liquid) is introduced from a suction port 61 and discharged from a discharge port 62 ; and the pump is equipped with; an impeller 20 that includes a plurality of blades 22 at an outer circumference and a rotor magnet 40 placed at an inner circumference; a shaft 41 fixed at a center of the impeller 20 ; a bearing component 50 (supplied as a couple of ball bearings 50 a and 50 b in FIG.
  • a motor stator 70 placed under the impeller 20 and at an inner circumference side of the rotor magnet 40 ; a case structural component 60 having the suction port 61 and the discharge port 62 that works to house the impeller 20 and furthermore to divide the impeller 20 and the motor stator 70 ; and a lid component 10 placed on the case structural component 60 that houses the impeller 20 .
  • a feature of the present invention is that a motor stator side surface 65 of the case structural component 60 is glued, or in other words, covered with an adhesive material 69 that cause the motor stator 70 to adhere to the motor stator side surface 65 .
  • a member with a reference numeral 80 in FIG. 1 and FIG. 2 is a substrate positioned under the motor stator 70 .
  • the description “on” in the “on the case structural component 60 that houses the impeller 20 ” described above represents “a higher position”, i.e., “a position closer to the lid component 10 ” in FIG. 2 under condition where the drawing is viewed in the same manner as defined above.
  • the description “a bottom surface” in a description “a bottom surface at a motor stator side of the impeller 20 ” represents “a bottom surface” under condition where the drawing is viewed in the same manner as defined above.
  • an inner circumference side in the “at an inner circumference side of the rotor magnet 40 ” described above represents “an inner circumference side”, i.e., “a position closer to the shaft” under condition where the drawing is viewed in the same manner as defined above. Meanwhile, in the same manner; a description “an outer circumference side” contrarily represents “a position more distant from the shaft”.
  • the impeller 20 is a disk-shaped body of revolution equipped with a plurality of blades 22 at an outer circumference, and as FIG. 1 and FIG. 2 show, the impeller 20 includes a ring-shaped blade component 21 , a disk-shaped rotor yoke 30 whose outer circumference is equipped with the blade component 21 , and a ring-shaped rotor magnet 40 placed at an inner surface side of an outer circumference wall 32 of the rotor yoke 30 .
  • the impeller 20 is fixed to the shaft 41 , which is supported by the bearing component 50 mounted on the case structural component 60 .
  • the impeller 20 is housed within a space that the lid component 10 and the case structural component 60 comprise, and a vortex flow of a fluid can be generated by revolution of the impeller.
  • the blade component 21 is, a ring-shaped component made of heat resistance plastic (PPS: poly-phenylene-sulfide), for example, and so on; and the blade component is fixed on an outer circumference surface of the outer circumference wall 32 of the disk-shaped rotor yoke 30 with an adhesive material and so on.
  • the blades 22 formed on the blade component 21 are in a form of a plurality of grooves 23 placed along a circumferential direction at an outer circumference of the blade component 21 .
  • the grooves 23 are formed at both edge sections, where end surfaces (i.e., upper and lower surfaces) of the blade component 21 intersect with an outer circumference surface, and the grooves are formed by cutting the edge sections of the blade component 21 into fan-shaped forms. No particular restriction exists on the number of the blades 22 , and usually the blades are placed at an optional pitch according to the size of the blade component 21 .
  • the rotor yoke 30 is a disk-shaped component at which the blade component 21 is mounted on an outer circumference surface of the outer circumference wall 32 ; and it is preferable that the rotor yoke is made of a magnetic material such as, for example, an SK material (tool carbon steel) on which anti-corrosion surface treatment is done.
  • the outer circumference surface of the rotor yoke 30 is formed with a dimension that makes it possible to mount the blade component 21 .
  • a protrusion edge part 36 is formed, for example, at a bottom edge of the outer circumference surface, for the purpose of locating the blade component 21 in engagement at a specified position.
  • the rotor magnet 40 is a ring-shaped component placed at an inner surface side of the outer circumference wall 32 of the rotor yoke 30 by using an adhesive material and so on.
  • a permanent magnet such as, for example, a neodymium-bond magnet and so on is used.
  • the rotor magnet 40 is located at a position which, being under the impeller 20 , faces the motor stator 70 placed at an inner circumference side of the rotor magnet 40 ; and in cooperation with the motor stator 70 , the rotor magnet makes the impeller 20 revolve in driving.
  • Preferably used in the present invention is an outer-rotor-type motor in which the rotor magnet 40 positioned at an outer circumference side revolves.
  • the impeller 20 constructed as described above is fixed to the shaft 41 , which is supported by the bearing component 50 .
  • a ball-bearing-type component as shown in FIG. 1 and FIG. 2 is preferably used; but a sleeve-type component, which is not illustrated, can also be used instead.
  • the case structural component 60 makes up a space, in which the impeller 20 is housed.
  • the case structural component 60 has the suction port 61 to suck a fluid, a fluid path 63 through which the fluid made into a vortex flow by revolution of the impeller 20 flows, and the discharge port 62 to discharge the fluid.
  • a material for the case structural component 60 and the lid component 10 it is preferable that, from the viewpoint of reduction in size and weight, a light metal such as an aluminum material or an aluminum alloy and so on, or a heat resistance plastic material (PPS) is used.
  • the fluid path 63 constructed by the case structural component 60 and the lid component 10 is formed with a wide width so as to surround a fringe of the blades 22 , and a cross-section of the fluid path 63 is shaped into size with which an outer section of the blades 22 is surrounded so as to have a wide clearance.
  • the fluid path 63 is formed to be about oval-shaped.
  • the suction port 61 and the discharge port 62 are formed.
  • the lid component 10 On the case structural component 60 that houses the impeller 20 , the lid component 10 is mounted in order to shield a space built up by the lid component 10 and the case structural component 60 .
  • various means can be applied for mounting the lid component 10 onto the case structural component 60 .
  • the lid component 10 is welded onto the case structural component 60 .
  • a welding method preferably selected for example is a method; where the case structural component 60 including a protrusion for welding 91 formed on an edge surface 92 that contacts the lid component 10 is used, and the lid component 10 is mounted on the case structural component 60 , and then laser radiation (for example, YAG laser and so on) from a position above the lid component 10 is carried out along the protrusion for welding 91 in order to weld together the lid component 10 and the case structural component 60 .
  • laser radiation for example, YAG laser and so on
  • ultrasonic welding can also be applied.
  • FIG. 1 shows an example where a through-hole 90 is formed for the purpose of mounting the vortex pump 1 of the present invention onto another component (such as a substrate not illustrated, and so on) by using a bolt and nut and so forth, no restriction particularly exists on a method of fastening the vortex pump 1 .
  • the motor stator 70 is placed under the case structural component 60 and at an inner circumference side of the rotor magnet 40 .
  • a stator yoke 71 included in the motor stator 70 a wire winding section for forming a wire-wound coil, i.e., a protruded pole part 711 , is placed at certain intervals, and then a wire-wound coil 72 is formed in the wire winding section.
  • a wire winding section for forming a wire-wound coil i.e., a protruded pole part 711
  • FIG. 1 and FIG. 3 show.
  • An outer circumference surface of the protruded pole part 711 of the motor stator 70 is placed at a position that faces the rotor magnet 40 .
  • a center level in a thickness direction of the rotor magnet 40 is located a bit higher than a center level in a thickness direction of the stator yoke 71 , namely, of the protruded pole part 711 .
  • size of the stator yoke 71 corresponds to what can be housed in a lower space of the case structural component 60 , as shown in FIG. 3 .
  • a material of the stator yoke is a magnetic material, as the foregoing material of the rotor yoke 30 of the impeller 20 is.
  • a wall in a thrust direction (hereinafter called a thrust-direction wall 66 ) of the case structural component 60 is designed to be, for example, about at least 0.2 mm and thinner than 1.0 mm in thickness for the purpose of realization of further-low-profile design of a vortex pump.
  • the thin thrust-direction wall 66 When the thin thrust-direction wall 66 is made to be even thinner, micro vibration during revolution of the impeller 20 causes sympathetic vibration with the thin-walled thrust-direction wall 66 so as to generate a large noise that becomes a significant problem especially in a case where the pump is used for a portable device and so on.
  • a construction is given in such a way that the motor stator side surface 65 of the case structural component 60 adheres to and gets fixed to the motor stator, or in other words, the motor stator side surface is covered with the adhesive material 69 in order to solve the problem described above.
  • strength of the thin thrust-direction wall 66 be increased by covering the motor stator side surface 65 of the case structural component 60 , without any void part, with the adhesive material 69 so that, despite micro vibration during revolution of the impeller 20 , no sympathetic vibration with the thrust-direction wall 66 is caused.
  • the adhesive material 69 preferably covers the motor stator side surface 65 (hereinafter called “the wall surface 65 ” in short), without any void part.
  • “to cover the surface without any void part” means that: if the wire-wound coil 72 which is a structural component of the motor stator 70 does not contact the wall surface 65 , only the adhesive material covers the wall surface 65 without any void part; meanwhile if a structural component of the motor stator 70 (for example, the wire-wound coil 72 ) contacts the wall surface 65 , the adhesive material covers any other section, without any void part, except a section where the wire-wound coil 72 and the wall surface 65 contact each other so that the adhesive material 69 cannot enter there.
  • the adhesive material is to be used for the purpose of fixing the motor stator 70 to the lower space of the case structural component 60 by applying the adhesive material.
  • various kinds of adhesive materials for example epoxy-base materials, acryl-base materials and so on, can be used; including furthermore, one-component type adhesive materials as well as two-component reactive type adhesive materials and light-curable type adhesive materials, without any restriction on the type indeed.
  • an important point is that viscosity and other properties of the adhesive material are controlled in order to make it possible to cover the motor stator side surface 65 of the case structural component 60 , without any void part.
  • the motor stator 70 is pressed into the lower space of the case structural component 60 until the wire-wound coil 72 of the motor stator 70 contacts the wall surface 65 , and then the adhesive material 69 is fed through a void space of the wire-wound coil 72 so that the adhesive material 69 is applied evenly all over the wall surface 65 .
  • the motor stator 70 is pressed into the lower space while contacting an outer circumference wall (hereinafter called a “radial-direction wall 67 ”) of the case structural component 60 and/or a shaft side wall (hereinafter called a “shaft side wall 68 ”) of the case structural component 60 . Therefore, the motor stator does not move even without any adhesive material, and furthermore the motor stator does not move while the adhesive material 69 is being charged and/or hardened.
  • the adhesive material 69 covering the wall surface 65 may be placed, as FIG. 2 shows for example, so as to cover a position of the stator yoke 71 included in the motor stator 70 , namely a position of the protruded pole part 711 , so that an entire part of the protruded pole part 711 adheres to and gets fixed to the motor stator side surface 65 of the case structural component 60 with the adhesive material 69 .
  • the adhesive material may be placed, as FIG.
  • FIG. 4 shows for example, so as to have a thickness that is thinner than a thickness of the stator yoke 71 included in the motor stator 70 so that only the wire-wound coil 72 adheres to and gets fixed to the motor stator side surface 65 of the case structural component 60 with the adhesive material 69 . Still further, it is also possible, as FIG. 5 shows, to cover an entire part of the motor stator 70 with the adhesive material. In order to fix the motor stator 70 to the lower space of the case structural component 60 by using the adhesive material 69 , it is possible only to drop the adhesive material at several spots for each wire-wound coil 72 or each combination of the wire-wound coil 72 and protruded pole part 711 .
  • a configuration is made up so as to have no exposure of the wall surface 65 and have the wall surface 65 contacted by at least one of the adhesive material 69 and any structural component of the motor stator 70 .
  • the adhesive material 69 covers the wall surface 65 with thickness of the adhesive material that is greater than 1.0 mm including thickness of the thrust-direction wall 66 .
  • FIG. 6 is an explanatory drawing to show an example of a configuration including an integral-type (which can also be expressed as “embedded-type”) case structural component 75 in which the motor stator 70 is embedded.
  • the integral-type case structural component 75 in which the motor stator 70 is integrated with a case structural component, can also be used as a structural component of the vortex pump 1 .
  • the integral-type case structural component 75 is usually formed through an integral molding process; in which a metal mold for injection molding provided with a specified shape is prepared, and the motor stator 70 is placed in the metal mold for injection molding, and then a mold resin material is injected through an injection gate into the metal mold to make up the integral-type case structural component. Therefore, the integral-type case structural component 75 shown in FIG. 6 corresponds to a configuration in which the adhesive material 69 in the configuration of FIG.
  • a vortex pump using the integral-type case structural component 75 is a pump in which a fluid (gas or liquid) is introduced from the suction port 61 and discharged from the discharge port 62 ; and the pump is equipped with; the impeller 20 that includes the plurality of blades 22 at an outer circumference and the rotor magnet 40 placed at an inner circumference; the shaft 41 fixed at a center of the impeller 20 ; the bearing component 50 (supplied as the couple of ball bearings 50 a and 50 b ) placed at an outer circumference of the shaft 41 ; the motor stator 70 placed under the impeller 20 and at an inner circumference side of the rotor magnet 40 ; the integral-type case structural component 75 having the suction port 61 and the discharge port 62 that works to house the impeller 20 and furthermore to embed the motor stator 70 ; and the lid component 10 placed on the integral-type case structural component 75 that houses the impeller 20 .
  • a feature of a vortex pump according to this configuration includes; having the integral-type case structural component 75 , and thickness “T” of a wall (thrust-direction wall) 66 of the integral-type case structural component 75 positioned at a side dividing the impeller 20 and the motor stator 70 , with which it becomes possible to restrain sympathetic vibration of the thrust-direction wall 66 .
  • the thickness “T” of the thrust-direction wall 66 is expressed as a distance between the wall surface 65 of the wire-wound coil 72 , positioned at a side of the impeller, and a surface of a side facing the impeller 20 in the motor stator 70 .
  • the vortex pump according to the configuration does not have sympathetic vibration of the thrust-direction wall 66 caused. Even if the thickness “T” of the thrust-direction wall 66 is thin, sympathetic vibration of the thrust-direction wall 66 can be restrained. Therefore, compact design and low-profile design of the vortex pump can be achieved.
  • circular protruded sections i.e., reference numerals of 31 , 32 , 55 and 56 .
  • the circular protruded sections (the reference numerals of 31 , 32 , 55 and 56 ) centered at the shaft 41 are placed at an outer circumference section, which is outside a position including an outer race of a ball bearing as the bearing component 50 , and including at least a lower surface of a motor stator side of the impeller 20 .
  • the circular protruded sections play a sealing role in preventing a lubricant material from evaporating or scattering away into an outer circumference direction of the impeller 20 when the bearing component 50 is supplied with the lubricant material, such as grease and so on.
  • the condition includes not only a case where the circular protruded sections are placed at the lower surface of the impeller 20 at the motor stator side but also another case where the circular protruded sections are placed at both the lower surface of the impeller 20 at the motor stator side and a surface of another component facing the objective surface.
  • Adequate condition is to have at least one circular protruded section (at least one of a first protruded section 31 and a second protruded section 32 ) at the lower surface of the impeller 20 at the motor stator side.
  • at least one couple of protruded sections facing each other are placed, like a couple of the first protruded section 31 and a third protruded section 55 or another couple of the second protruded section 32 and a fourth protruded section 56 ; and still further it is preferable that; (2) two or more couples of protruded sections in which the protruded sections face each other are prepared as FIG. 2 shows.
  • two circular-shaped protrusion sections i.e., the first protruded section 31 and the second protruded section 32 are formed at a lower surface of the motor stator side of the disk-shaped rotor yoke 30 included in the impeller 20 while being provided with a specified clearance (for example, a clearance of 1 mm).
  • two circular-shaped protrusion sections i.e., the third protruded section 55 and the fourth protruded section 56 , having the same circular-shaped profiles as the first protruded section 31 and the second protruded section 32 have, are formed at each position opposite to the first protruded section 31 and the second protruded section 32 while being provided with a specified clearance (for example, a clearance of 1 mm).
  • a clearance between the first protruded section 31 and the third protruded section 55 as well as another clearance between the second protruded section 32 and the fourth protruded section 56 are each approximately 200 microns.
  • the sealing section 590 is preferably filled with a lubricant material, such as grease and so on, as described above. Filling the first space 58 with a lubricant material, such as grease and so on, makes it possible to prevent evaporating or scattering away of a lubricant material out of a bearing component section at an inner side and furthermore to prevent a fluid coming in out of an outer side and also preferably a liquid coming in.
  • the sealing section 590 prevents the lubricant material charged in the second space 59 at the bearing component side from evaporating or scattering away in order to secure good lubricating condition of the shaft and the bearing component. Moreover, the sealing section 590 can effectively prevent a fluid from getting into the shaft 41 .
  • the fourth protruded section 56 is formed to be circular on a surface of the case structural component 60 at a side of the rotor yoke 30 , while the third protruded section 55 is constructed by an upper end of a ring component 54 mounted at a surface of the case structural component 60 at a side of the bearing component 50 .
  • the sealing section 590 is formed at, or in a vicinity of the bearing component.
  • the protruded sections of the sealing section are formed at any other position, e.g., at around a middle position toward a circumferential edge of the rotor yoke 30 , or at an outer circumference side; the sealing section becomes preferred as far as run-out and tilt of the impeller 20 are concerned.
  • the protruded sections are located at an outer circumference position, a better effect is especially expected.
  • it is usually preferable that the sealing section is formed at or in a vicinity of the bearing component, as shown in FIG. 2 .
  • the reason is that forming the protruded sections at such a position is relatively easier in terms of thickness of components; and furthermore when the protruded sections are formed at an outer circumference position, grease and so on of the sealing section 590 becomes a resistance to revolving operation and creates a load, so that effective revolving operation with low power consumption is hampered.
  • FIG. 7 is an explanatory drawing to describe a preload “F” given onto the bearing component 50 constructed with the couple of ball bearings of 50 a and 50 b that are stacked up.
  • Outer circumference rings of the ball bearings of 50 a and 50 b are fixed to the ring component 54 mounted onto the case structural component 60 by using an adhesive material and so on at a side of the bearing component 50 , while inner rings of the ball bearings of 50 a and 50 b are fixed to the shaft 41 .
  • the center level in the thickness direction of the rotor magnet 40 is located a bit higher than the center level in the thickness direction of the stator yoke 71 . Therefore, while the impeller 20 is revolving, a downward force “F” acts on the impeller. Since the force “F” acts so as to press the shaft 41 downward, other downward forces “F 1 ” and “F 3 ” also act on inner circumference rings of the ball bearings of 50 a and 50 b that are fixed to the shaft 41 . Furthermore, other downward forces “F 2 ” and “F 4 ” also act on balls included in the ball bearings of 50 a and 50 b.
  • a load is given to upper contacting sections “P” and “R” between the inner circumference rings and balls included in the ball bearings of 50 a and 50 b
  • a load is given to lower contacting sections “Q” and “S” between the inner circumference rings and balls included in the ball bearings of 50 a and 50 b . Since the loads (preloads) given to the upper contacting sections “P” and “R” as well as the lower contacting sections “Q” and “S” stabilize revolving operations of the ball bearings of 50 a and 50 b , revolution free from any play can be realized.
  • a ratio of length “L” of the bearing component to inner diameter “D” thereof is usually 2 or greater.
  • LID a ratio of length “L” of the bearing component to inner diameter “D” thereof

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
  • Motor Or Generator Frames (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
US11/755,304 2006-06-06 2007-05-30 Vortex pump Abandoned US20070280837A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2006156859 2006-06-06
JP2006-156859 2006-06-06
JP2007123958A JP5112741B2 (ja) 2006-06-06 2007-05-08 渦流ポンプ
JP2007-123958 2007-05-08

Publications (1)

Publication Number Publication Date
US20070280837A1 true US20070280837A1 (en) 2007-12-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US11/755,304 Abandoned US20070280837A1 (en) 2006-06-06 2007-05-30 Vortex pump

Country Status (5)

Country Link
US (1) US20070280837A1 (zh)
JP (1) JP5112741B2 (zh)
KR (1) KR101300887B1 (zh)
CN (1) CN101086259B (zh)
TW (1) TWI404865B (zh)

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JP6329576B2 (ja) * 2016-02-18 2018-05-23 本田技研工業株式会社 燃料電池システム用の循環ポンプ
CN111106698A (zh) * 2018-10-29 2020-05-05 日本电产株式会社 马达以及减速装置
JP7267560B2 (ja) * 2018-12-21 2023-05-02 ニデックインスツルメンツ株式会社 ポンプ装置
CN109707633B (zh) * 2019-01-30 2023-10-03 深圳市研派科技有限公司 一种水泵
CN110566495B (zh) * 2019-08-30 2020-07-28 华中科技大学 一种超薄微型泵的轴承结构及超薄微型泵
CN113187730B (zh) * 2020-01-13 2022-12-27 华为终端有限公司 微型泵
DE102021202023A1 (de) * 2021-03-03 2022-09-08 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren zum Herstellen eines Seitenkanalverdichters mit einem Hohlvolumen eines elektrischen Passivteils und Seitenkanalverdichter für ein Brennstoffzellensystem zur Förderung und/oder Verdichtung eines gasförmigen Mediums, insbesondere Wasserstoff

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CN110500300A (zh) * 2019-08-02 2019-11-26 烟台菱辰能源有限公司 一种旋涡式氢循环泵

Also Published As

Publication number Publication date
KR101300887B1 (ko) 2013-08-27
JP5112741B2 (ja) 2013-01-09
TW200809092A (en) 2008-02-16
CN101086259B (zh) 2012-06-13
TWI404865B (zh) 2013-08-11
KR20070116742A (ko) 2007-12-11
CN101086259A (zh) 2007-12-12
JP2008014300A (ja) 2008-01-24

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