WO2006129657A1 - モータ一体型内接歯車式ポンプ及びその製造方法並びに電子機器 - Google Patents
モータ一体型内接歯車式ポンプ及びその製造方法並びに電子機器 Download PDFInfo
- Publication number
- WO2006129657A1 WO2006129657A1 PCT/JP2006/310767 JP2006310767W WO2006129657A1 WO 2006129657 A1 WO2006129657 A1 WO 2006129657A1 JP 2006310767 W JP2006310767 W JP 2006310767W WO 2006129657 A1 WO2006129657 A1 WO 2006129657A1
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- WIPO (PCT)
- Prior art keywords
- rotor
- pump
- casing
- motor
- internal gear
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
- F04C15/008—Prime movers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49229—Prime mover or fluid pump making
- Y10T29/49236—Fluid pump or compressor making
- Y10T29/49242—Screw or gear type, e.g., Moineau type
Definitions
- the present invention relates to a motor body type internal gear pump, a manufacturing method thereof, and an electronic device.
- Internal gear pumps have long been known as pumps that pump out sucked liquid against pressure, and are particularly popular as hydraulic source pumps and oil supply pumps.
- the internal gear type pump is mainly composed of a spur gear-shaped inner rotor having teeth formed on the outer periphery and an annular outer rotor having teeth formed on the inner periphery and having substantially the same width as the inner rotor. It is configured as a part.
- a casing having a flat inner surface facing the both side surfaces of the rotors through a slight gap is provided so as to accommodate both rotors.
- the number of teeth of the inner rotor is usually one less than the number of teeth of the outer rotor, and they rotate in the same manner as the power transmission gear with their teeth being held together. The change in the tooth gap area with this rotation causes the pump to function by sucking and discharging the liquid confined in the tooth gap.
- the casing is provided with at least one suction port and an opening to the outside flow path called the discharge port.
- the suction port is provided so as to communicate with a tooth gap whose volume increases, and the discharge port is provided so as to communicate with a tooth groove whose capacity decreases.
- a rotor (corresponding to a stator) mounted inside a motor casing (corresponding to a stator) has a rotor (corresponding to a rotor) on the outer periphery so as to be in contact with the stator at a predetermined radial distance.
- the inner gear (corresponding to the outer rotor) equipped with the inner gear (corresponding to the inner rotor) that fits in the outer gear is arranged, and both end faces of the inner gear are arranged. It is composed of an internal gear pump in which a suction port and a discharge port are provided in which one of these block plates is closed in a liquid-tight manner.
- the closing plate is provided with a front casing and a rear casing.
- Disc-shaped thrust bearings are arranged between both casings and both side surfaces of the inscribed gear pump, both sides of the outer gear are supported by the thrust bearings, and both casings are further provided. Both ends of the support shaft are fixed to the inner shaft, and the inner gear is rotatably supported on the support shaft via a radial bearing. A part of the liquid on the discharge side that has been pressurized flows between the rotor and the stator. A liquid supply path that lubricates the bearing portion and returns it to the suction side is provided.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2-2777983
- the pump casing includes two thrust bearings, a front casing, a rear casing, and a stator balancer.
- a front casing In the case of a powerful structure, there are problems that the cost increases due to the production and combination of a large number of members, and the reliability decreases due to an increase in the number of leak prevention seals.
- the distance between the two thrust bearings is regulated by the distance between the front casing and the casing on both sides thereof, and the distance between the front casing and the rear casing depends on the axial length of the stator casing. It is regulated.
- the friction between the two thrust bearings during rotation between the inner and outer gears and the two thrust bearings where it is difficult to accurately control the distance between the portions facing the inner and outer gears of the two thrust bearings.
- the resistance increases, and in extreme cases, rotation may be difficult.
- An object of the present invention is to provide a motor body-type internal gear pump and a low-cost, high-reliability motor-type internal gear pump that maintains a small and inexpensive function as a motor-type internal gear pump. It is to obtain a manufacturing method and an electronic device.
- a first aspect of the present invention for achieving the above object includes a pump unit that sucks and discharges a liquid and a motor unit that drives the pump unit, and the pump unit has teeth on an outer periphery.
- An inner rotor having a shaft hole penetrating in the center, an outer rotor having teeth that mesh with the teeth of the inner rotor and having a tooth width comparable to that of the inner rotor,
- a pump casing that houses the inner rotor and the outer rotor, and an inner shaft that is inserted into the shaft hole and pivotally supports the inner rotor, and the pump casing forms teeth of the inner rotor!
- Both end surfaces of the scooping portion and the end faces of the outer rotor forming the teeth of the outer rotor are provided with flat inner surfaces facing each other with a slight gap, and the motor portion is disposed inside the pump casing.
- a rotor integrated with the outer rotor In a motor-type internal gear pump that includes a stator that rotates by causing a rotating magnetic field to act on a rotor, the outer diameter of the inner shaft is slightly smaller than the inner diameter of the shaft hole of the inner rotor.
- the pump casing is composed of two pump casing members each forming the flat inner surfaces on both sides as separate members, and is fitted into a fitting hole formed on the flat inner surfaces of the two pump casing members.
- the two pump casing members are joined to each other on the outer side of the outer diameter of the outer rotor by fitting the fitting portion of the shaft and contacting the flat inner surface to both end surfaces of the bearing portion of the inner shaft. It is structured.
- the two casing members are made of synthetic resin, and form a sealing portion that extends in a cylindrical shape in the axial direction from a position outside the outer periphery of one of the flat inner surface portions, and more than the flat inner surface portion.
- Axial rigidity of the sealing part is flexible and bonded at the tip side of the sealing part.
- the two casing members should be ultrasonically welded at a joint surface to which an axial force is applied.
- the pump casing is made of a synthetic resin case having a suction port and a discharge port.
- the front casing which is a single member and the rear casing which is the other synthetic resin casing member are welded by ultrasonic welding.
- the back casing surrounds the outer periphery of the outer rotor with a thin cylindrical sealing portion continuous to the outer periphery of the flat inner surface, and the side connected to the flat inner surface of the sealing portion is The opposite end face has a flange portion that expands in the radial direction.
- the weld portion is formed on the end face of the flange portion, and further, the outer periphery of the end portion is folded back in the axial direction to the outside of the sealing portion.
- the cover part which comprises a concentric cylinder shall be the structure which continues,
- the said stator shall be incorporated in the cylindrical space pinched
- the welded portion between the front casing and the rear casing is formed in a portion excluding the portion constituting the flow path together with the suction port and the discharge port.
- a second aspect of the present invention includes a pump unit that sucks and discharges liquid, a motor unit that drives the pump unit, and a control unit that controls the motor unit,
- the pump portion has teeth formed on the outer periphery and a shaft hole penetrating in the center portion, teeth that mesh with the teeth of the inner rotor are formed on the inner side, and the tooth width is approximately the same as the inner rotor.
- the pump casing forms the teeth of the inner rotor, and has flat inner surfaces facing each other with a slight gap on both side surfaces of the portion and on both side surfaces of the portion forming the teeth of the outer rotor.
- the motor unit includes a rotor that is a permanent magnet disposed inside the pump casing and integrated with the outer rotor, and a stator that is rotated by applying a rotating magnetic field to the rotor.
- the motor-type internal gear pump including the circuit board on which the control element is mounted, a power supply line that supplies current to the stator, and an introduction wire that is supplied with current from the outside.
- the outer rotor includes a projecting portion whose outer peripheral portion projects in an annular shape on both sides in the axial direction, and the inner surface of the projecting portion sandwiches a minute gap from the cylindrical outer surface formed in the pump casing.
- the outer rotor has an outer diameter of 1.7 to 3.4, and the overhanging portion of the outer rotor, when the radial width of the inner rotor and the outer rotor is 1. Structure with an inner diameter of 2.5 to 5, an axial length of the outer rotor overhang of 0.4 to 0.8, and an inner rotor rotation speed in the range of 2500 to 5000 revolutions per minute It is a thing.
- a third aspect of the present invention is an electronic device in which any one of the motor-type internal gear pumps is mounted as a cooling liquid circulation source.
- a fourth aspect of the present invention includes a pump unit that sucks in and discharges liquid, and a motor unit that drives the pump unit, and the pump unit forms teeth on an outer periphery.
- An inner rotor having a shaft hole penetrating in the center, an outer rotor formed with teeth that mesh with the teeth of the inner rotor and having a tooth width comparable to the inner rotor, and the inner rotor
- a pump casing that houses the outer rotor, and an inner shaft that is inserted into the shaft hole and pivotally supports the inner rotor, and the pump casing has both ends of the portion forming the teeth of the inner rotor.
- the outer diameter is slightly smaller than the inner diameter of the shaft hole of the inner rotor and slightly in the axial direction than the tooth width of the inner rotor.
- the inner shaft is prepared by including a long cylindrical bearing portion and a fitting portion extending from both end faces of the bearing portion to both sides in the axial direction and having an outer diameter smaller than the outer diameter of the bearing portion, A front casing having a flat inner surface and a fitting hole is produced, and a rear casing having a sealing portion extending in a cylindrical shape from an outer periphery of the flat inner surface, the fitting hole and the flat inner surface portion is produced, and both sides of the inner shaft Are fitted into the fitting holes of the front casing and the fitting holes of the rear casing, and the flat inner surface of the front casing and the flat inner surface of the rear casing are brought into contact with both end surfaces of the bearing portion of the inner shaft.
- Ru der be joined together outside than the outer diameter of the outer rotor and the rear casing and the front casing.
- a more preferable specific configuration example according to the fourth aspect of the present invention is as follows. (1) The fitting portions on both sides of the inner shaft are fitted into the fitting holes of the front casing and the fitting holes of the rear casing, and the flat inner surface of the front casing and the flat inner surface of the rear casing are connected to the inner side. Ultrasonic welding is performed in addition to the direction approaching the axial direction at the joint between the front casing and the rear casing in contact with both end faces of the shaft bearing.
- a motor body-type internal gear pump a manufacturing method thereof, and an electronic device that maintain a small and inexpensive function as a motor-body-type internal gear pump, and that are more inexpensive and highly reliable. Equipment is obtained.
- FIG. 1 is a longitudinal sectional view of a motor body type internal gear type pump 80 according to an embodiment of the present invention
- FIG. 2 is a front view showing a cross section of the left half of the pump 80 of FIG. 1
- FIG. 3 is a pump of FIG.
- FIG. 4 is an exploded perspective view of the pump section at 80
- FIG. 4 is a cross-sectional view showing a method of joining the casing of the pump 80 of FIG.
- the pump 80 is a motor-integrated internal gear pump configured to include a pump unit 81, a motor unit 82, and a control unit 83.
- the pump unit 81 includes an inner rotor 1, an outer rotor 2, a front casing 3, a rear casing 4, and an inner shaft 5.
- the front casing 3 and the rear casing 4 are members that form a pump casing.
- the pump casing member is composed of two separate pump casing members.
- the back casing 4 includes a sealing portion 6, a flange portion 18 and a cover 13.
- the inner shaft 5 constitutes an inner rotor support shaft, and in this embodiment, the inner shaft 5 is composed of a separate member from the front casing 3 or the rear casing 4.
- the inner rotor 1 has a shape similar to a spur gear, and has a tooth la having a trochoidal curve as an outline on the outer periphery. Strictly speaking, this tooth surface has a slight gradient in the axial direction and is injection molded. It has a so-called “draft angle” that helps to clear the time. Also, the inner rotor
- Both end faces lc of the inner rotor 1 are flat and smoothly finished, and slide between the front inner face 3 and the rear casing 4 between the flat inner faces 25 and 26 which are the end faces of the central annular portions 27 and 28 projecting inwardly. A moving surface is formed.
- the outer rotor 2 has a ring-shaped internal gear shape with substantially the same tooth width as the inner rotor 1, and is formed with one tooth having a tooth shape formed by an arc or the like more than the inner rotor 1.
- the teeth 2a of the outer rotor 2 have almost the same cross-sectional shape in the axial direction as a spur gear, but have a slight gradient in the axial direction, which is a so-called “draft gradient” that helps with punching during injection molding. You may have. In this case, the same draft angle is given to the inner rotor 1, the direction of the gradient between the inner rotor 1 and the outer rotor 2 is reversed, and the diameter of the outer teeth of the inner rotor 1 is increased.
- Both end surfaces 2b of the tooth portion of the outer rotor 2 are finished flat and smooth, form surfaces that slide between the flat inner surfaces 25 and 26 of the front casing 3 and the rear casing 4, and function as thrust bearings.
- the outer rotor 2 has substantially the same width as the inner rotor 1 except for the outer peripheral portion, and the outer rotor 2 is arranged outside the inner rotor 1 so that both end faces of the inner rotor 1 and the outer rotor 2 are substantially coincident with each other. It is arranged.
- the inner rotor 1 and the outer rotor 2 are made of polyacetal (POM) or polyphenylene sulfide.
- PPS self-lubricating properties
- annular projecting portion 21 projecting in the axial direction from the tooth portion (portion having the same tooth width as that of the inner rotor 1 located inside) is formed.
- the inner periphery of the overhanging portion 21 is formed as a smooth surface and constitutes a surface that slides between the outer peripheral surfaces 27 and 28 of the shoulder portion 22.
- the outer rotor 2 and the inner rotor 1 are configured to rotate while being sandwiched between the front casing 3 and the rear casing 4 in a state of being held together.
- the bearing of the inner shaft 5 having a smooth outer periphery is fitted in the center shaft hole of the inner rotor 1 with a slight gap, so that the inner rotor 1 can be freely rotated on the inner shaft 5 and the shaft. It is supported.
- Inner shaft 5 is front casing 3 and rear casing. It will not rotate because it fits closely to
- the inner shaft 5 includes a cylindrical bearing portion 51 having an outer diameter slightly smaller than the inner diameter lb of the inner rotor 1 and slightly longer in the axial direction than the tooth width of the inner rotor 1, and a bearing portion 51 And a fitting portion 53 that extends from both end surfaces to both sides in the axial direction and has an outer diameter smaller than the outer diameter of the bearing portion 51.
- the axial length of the bearing portion 51 located at the center of the inner shaft 5 is slightly longer (for example, 0.05 to 0.1 mm) than the tooth width of both rotors.
- bearing portion 51 and the fitting portion 53 are names of the portions of the inner shaft 5 that are manufactured with the same metal material force, and are integrated. Since the inner shaft 5 is made of a metal material, it is superior in terms of strength and dimensional accuracy compared to the inner rotor 1, outer rotor 2, front casing 3, and rear casing 4 made of synthetic resin. ing.
- the inner shaft 5 also has a function as a structural material that connects the front casing 3 and the rear casing 4.
- the fitting portion 53 is inserted and fixed in fitting holes 27a and 28a formed in the flat inner surfaces 25 and 26 of both casings 3 and 4.
- stepped surfaces (both end surfaces of the bearing portion 51) 51a that serve as a boundary between the bearing portion 51 and the fitting portion 53 are adhered to the flat inner surfaces 25 and 26 of the casing. Therefore, the length of the bearing 51 matches the distance (interval) between the flat inner surfaces 25 and 26, and the rotors 1 and 2 are flat inner surfaces 25 that are end surfaces in the axial direction of the front casing 3 and the rear casing 4. , 26 will be built in with a slight gap.
- the fitting holes of the front casing 3 and the rear casing 4 are eccentric with respect to the shoulders in accordance with the balance between the rotors 1 and 2.
- the outer peripheral surfaces 27 and 28 of the shoulder portion 22 of the front casing 3 and the rear casing 4 are fitted to the inner peripheral surface of the overhanging portion 21 of the outer rotor 2 with a slight gap so that the front casing 3 and the rear casing Both sides of the outer rotor 2 are rotatably supported by the shoulders 22 of 4 and act as radial bearings.
- the shoulder portions 22 of the front casing 3 and the rear casing 4 are in a positional relationship such that a partial force of the same circular column is cut out.
- the front casing 3 constituting the other of the two pump casing members has openings called suction ports 8 and discharge ports 10 formed on the flat inner surface 25 thereof.
- the suction port 8 and the discharge port 10 are located inside the root circle of the inner rotor 1 and the bottom circle of the outer rotor 2 (the outer rotor 2 is Since the gear is a gear, the root diameter is larger than the tip diameter.
- the suction port 8 faces the working chamber 23 whose volume increases, and the discharge port 10 faces the working chamber 23 whose volume decreases.
- the working chamber 23 at the moment when the maximum volume is reached is configured so that neither of the ports 8 and 9 faces, or is kept in communication with a slight cross-sectional area.
- the suction port 8 and the discharge port 10 are also opened to the outside through the L-shaped flow path, and communicated with the suction port 7 and the discharge port 9 respectively.
- a communication path 9a that branches and communicates with the internal space 24 that faces the outer periphery of the outer rotor 2.
- This internal space 24 is a space surrounded by the front casing 3 and the back casing including the sealing portion 6.
- the motor unit 82 includes a rotor 11, a stator 12, and a sealing unit 6 made of permanent magnets.
- the sealing part 6 is shared by the pump part 81 and the motor part 82.
- a permanent magnet is integrated as a rotor 11 of the motor unit 82 on the outside of the outer rotor 2.
- the outer rotor 2 and the permanent magnet can be integrated as a separate member and then integrated by a method with sufficient strength and reliability, such as bonding and press-fitting.
- the rotor 11 may be molded as an integral member.
- the rotor 11 is configured so that alternating polarities are given in the radial direction, and NS poles are alternately arranged along the circumference when the outer side force is also seen.
- the thin cylindrical sealing portion 6 is provided between the outer periphery of the rotor 11 via a minute gap (for example, a gap of 1 mm or less), and the rotor 11 can rotate together with the outer rotor 2. ing.
- a minute gap for example, a gap of 1 mm or less
- the rear casing 4 constituting one of the two casing members has a cylindrical sealing portion that extends in the axial direction so as to cover the outer side of the outer rotor 2 from the outer peripheral partial force from the portion constituting the flat inner surface 26. 6 is formed so that the axial rigidity of the sealing portion 6 side is more flexible than the flat inner surface 26 side, and is joined to the front casing 3 constituting one of the two casing members at the distal end side of the sealing portion 6. Yes. That is, the sealing portion 6 is a part of the rear casing 4 and refers to a thin plate portion that extends in the front direction in a cylindrical shape from the outer periphery of the portion where the flat inner surface and the shoulder portion are formed.
- the front casing 3 and the rear casing 4 are in contact with each other by a cylindrical surface called a mating surface 16, and are radially It is fitted with a degree of freedom to move in the axial direction while restricting the direction.
- the fitting surface 16 is composed of a fitting surface between the inner periphery of the tip portion of the sealing portion 6 and the outer periphery of the outer annular portion 29 formed on the inner surface side of the front casing 3.
- a concave portion is provided in the inner periphery of the tip portion of the sealing portion 6 adjacent to the fitting surface 16.
- a plurality of welding protrusions 41 are provided in an annular shape toward the back side, and the flange portion 18 of the rear casing 4 opposite to the welding protrusions 41 has a welding groove 42 into which the welding protrusion 41 is inserted. It is formed in an annular shape.
- the tip of the welding projection 41 is formed on an inclined surface, and the bottom of the welding groove 42 has an inclined surface that matches the inclined surface, so that the welding tools 43, 44 Is pressed against the flange 18 of the front casing 3 and the outer casing 4 of the back casing 4 from both sides, giving a slight vibration to the welding tools 43 and 44 while applying force.
- welding tools 43 and 44 are attached to an ultrasonic welder to apply ultrasonic vibration.
- the contact surfaces of the casings 3 and 4 generate heat due to micro vibration friction, melt and melt together, and when the temperature drops after vibration stops, they resolidify and become one. Therefore, the surface on the back side of the welding projection 41 of the front casing 3 and the surface on the back side of the welding groove 42 of the back casing 4 are flat and open so that the welding tools 43 and 44 are in close contact with each other. .
- the groove into which the welding tool 44 on the back casing 4 side is inserted is an annular groove for inserting the stator 12 after welding, as compared to a case where a structure such as a groove only for welding is provided. Can be made small and simple.
- the sealing portion 6 is thin and flexible, including the structure in the vicinity thereof, compared to the flat inner surface, the shoulder portion, and the vicinity of the welded portion.
- the fitting portion 53 of the inner shaft 5 is inserted into the rear casing 4, and the inner rotor 1 and the outer rotor 2 are connected.
- the front casing 3 fitted with the inner shaft 5 and fitted with the O-ring 14 is fitted into the rear casing 4.
- welding jigs 43 and 44 are applied from both sides of both casings 4 and 5, and ultrasonic vibration is applied while pressing them with a predetermined force.
- the contact portion between the welding protrusion 41 and the welding groove 42 is melted, and the front casing 3 and the rear casing 4 are displaced toward each other.
- the stepped surface 51a of the inner shaft 5 is in close contact with the flat inner surfaces 25, 26.
- the sealing portion 6 of the back casing 4 and the periphery thereof are elastically deformed and the welding proceeds deeply.
- the vibration is stopped while the force is applied to the welding jigs 43 and 44, the melted welded portion is cooled and solidified, and the shape is determined in that state.
- the stepped surface 51a of the inner shaft 5 remains in intimate contact with the flat inner surfaces 25, 26, and the force to adhere is recognized as the reaction force of elastic deformation around the sealing portion 6. Will remain.
- the inner shaft 5 is made of metal, and the axial dimensional accuracy is easier to obtain than the casing members 3 and 4 made of resin.
- the dimension in the tooth width direction can be secured at the central part closest to the tooth parts of the rotors 1 and 2.
- the welding projection 41 is formed in an annular shape, but is not provided continuously around the circumference, but has a shape lacking a part from the circumference as shown in FIG. The reason for this is to limit the area more than one round to concentrate and increase the pressing force during welding to ensure welding, and to arrange the suction and discharge channels in the missing part. This is to avoid interference between the welding tool 43 and these flow paths.
- the fitting surface 16 By the action of the fitting surface 16, the positioning accuracy in the radial direction of the two casings can be combined well, and the axial position can be maintained by the close contact between the inner shaft 5 and the flat inner surfaces 25, 26.
- the internal space 24 is sealed by the O-ring 14, and except for the suction port 8 and the discharge port 10, it has a simple structure with no other holes or mating surfaces communicating with the outside world. Therefore, leakage of liquid can be reliably prevented.
- Rear casing 4 Further peripheral force of the front flange 18 of the sealing portion 6 that continues to force
- the cover 13 is formed by body molding.
- the cover 13 covers the outer periphery of the stator 12 of the motor part 82 and serves to prevent electric shock, maintain aesthetics, and prevent noise.
- a stator 12 that is wound on a comb-like iron core is press-fitted on the outer periphery of the sealing portion 6.
- the stator 12 is fitted into an annular groove formed between the sealing portion 6 and the cover 13.
- the motor part 82 composed of the rotor 11 and the stator 12 is arranged on the outer peripheral side of the pump part 81 composed of the inner rotor 1 and the outer rotor 2 and is not arranged in the axial direction, so that the pump 80 can be made thinner and smaller. Illustrated.
- the control unit 83 is for controlling the motor unit 82, and includes a DC brushless motor driving inverter electronic circuit. By providing the motor part 82 on the outer peripheral side of the pump part 81 as described above, the control part 83 can be installed on the back side of the pump part 81 where the suction port 7 and the discharge port 9 are not provided.
- a power element 32 which is the main electronic component, is mounted on the circuit board 31 to constitute a DC brushless motor driving inverter circuit.
- the circuit board 31 is fixed to the back casing 4 by applying force through a protrusion 45 provided on the back side of the back casing 3 in a hole provided in the center thereof.
- the power element 32 is in contact with the rear casing 4 through the circuit board 31. Thereby, the heat generated in the inverter circuit can be radiated to the liquid to be fed in the pump 81 through the rear casing 4.
- the circuit board 31 is connected to one end of a stator wire of the stator 12, and is connected to a power line 33 for supplying power from an external force, a rotation output line 34 for transmitting information on the rotation speed by pulses, and a common ground line thereof. Is done.
- a DC brushless motor is composed of a motor unit 82 having a rotor 11 and a stator 12 made of permanent magnets, and a control unit 83 having an inverter electronic circuit.
- a structure in which the rotor 11 is inside the thin sealing portion 6 and the stator 12 is outside the sealing portion 6 is called a canned motor. Since the canned motor uses magnetic force to transmit the rotational power to the inside of the sealing part 6 called can, without the need for a shaft seal, etc., the volume of the working chamber 23 can be changed while isolating the liquid to be delivered from the outside. Suitable for the structure of positive displacement pumps that send out! / Speak.
- the object of the present invention can be more achieved.
- the width of the inner rotor 1 and the tooth width of the outer rotor 2 are 1, the outer diameter of the inner rotor is 1.7 to 3.4, the inner diameter of the outer rotor is 2.5 to 5, and the outer rotor is Part axis
- the length in the direction shall be 0.4 to 0.8.
- the inner diameter of the overhanging portion 21 of the outer rotor 2 needs to be geometrically larger than the outer diameter of the inner rotor 1. At the same time, if it is larger than this range, the frictional force increases the internal leakage from the bearing surface and the pump performance decreases.
- the axial length of the outer rotor overhanging portion 21 is smaller than this range, the bearing surface pressure increases, and frictional wear may increase, which may reduce the pump life and reliability. is there. In addition, if it is larger than this range, it will be easy to cause contact due to errors such as cylindricity or concentricity of the bearing surface.
- the rotational speed of the inner rotor is preferably in the range of 5000 revolutions per minute from 2500 forces. If the rotational speed is slower than this range, the ratio of the internal leakage to the transport flow rate will increase and the pump efficiency will decrease. If it is faster than this range, the vibration noise generated by the pump will increase.
- the liquid to be delivered is sucked from the suction port 7 through the suction port 8 into the working chamber 23 whose volume is being expanded.
- the working chamber 23 having the largest volume is inhaled by the rotation of the rotor and the contour force of the suction port 8 is shifted, and then communicated with the discharge port 10.
- the volume of the working chamber 23 is reduced, and the liquid to be delivered in the working chamber 23 is sent out from the discharge port 10.
- the delivered liquid is sent out from the discharge port 9 to the outside. Since there is a communicating passage 9a branched in the middle of the discharge flow path, the internal pressure of the internal space 24 is maintained at the discharge pressure.
- the suction flow path is short, the suction negative pressure is small and the occurrence of cavitation can be prevented. Also, since a relatively high discharge pressure acts on the inner surface of the sealing portion 6 and pushes it outward, the thin sealing portion 6 is deformed inward and contacts the rotor 11. Can be avoided. At the same time, it is possible to reduce leakage from a gap as a radial bearing formed on the overhanging portion 21 of the outer rotor 2. The reason for this is that the leakage force from the gap enhances the outward force due to the centrifugal force, but if the internal pressure in the inner space 24, which is the outer periphery, is high, it acts to push it back.
- the heat of the power element 32 that needs to be cooled due to the heat generated by the operation contacts the circuit board 31 and passes through the wall surface of the rear casing 4 to the liquid to be delivered flowing in the internal space 24. It is transferred to the outside.
- the pumped liquid in the internal space 24 is constantly stirred and sequentially replaced by minute leakage from the radial bearing surface, so that heat can be efficiently removed.
- a heat sink or a cooling fan for cooling the power element 32 is not required.
- the heat generated by the motor loss generated in the rotor 11 and the stator 12 can also be efficiently removed to prevent an abnormal temperature rise.
- Fig. 6 is a perspective view showing the overall configuration of the personal computer with the personal computer body placed vertically, and the electronic device shown in Fig. 4 is an example of a desktop personal computer.
- the personal computer 60 includes a personal computer main body 61A, a display device 61B, and a keyboard 61C.
- the liquid cooling system 69 is connected to the computer main unit 61 A with a CPU (central processing unit). This is built in with 62, and is composed of a closed-loop system in which the liquid reservoir 63, pump 80, heat exchanger 65, heat sink ⁇ 66, and heat sink ⁇ 67 are connected in this order by pipes.
- the purpose of installing this liquid cooling system 69 is mainly to carry the heat generated by the CPU 62 built in the personal computer main body 61A to the outside and maintain the temperature rise of the CPU 62 below a specified value.
- the liquid cooling system 69 using water or a solution mainly composed of water as a heat medium is suitable for cooling the CPU 62 that generates a large amount of heat because it has a high heat carrying capacity and low noise compared to the air cooling system.
- the liquid reservoir 63 is filled with liquid to be fed and air.
- the liquid reservoir 63 and the pump 80 are juxtaposed, and the outlet of the liquid reservoir 63 and the suction port of the pump 80 are connected by a pipe line.
- a heat exchanger 65 is installed in close contact with the heat radiating surface of the CPU 62 via heat conductive grease.
- the discharge port of pump 80 and the inlet of heat exchange ⁇ 65 are connected by a pipe line.
- the heat exchanger 65 communicates with the heat sink ⁇ 66 via a pipe, the heat sink ⁇ 66 communicates with the heat sink ⁇ 67 via the pipe, and the heat sink ⁇ 67 communicates with the liquid reservoir 63 via the pipe.
- the heat sink ⁇ 66 and the heat sink ⁇ 67 are installed so that different surface forces of the PC main body 61 ⁇ ⁇ ⁇ can be dissipated to the outside.
- the power line 33 is drawn from the DC 12V power supply normally provided in the personal computer 60 to the pump 80, and the rotation output line 34 is connected to the electronic circuit of the personal computer 60 which is the host control device.
- the operation of the liquid cooling system 69 will be described.
- the pump 80 starts up and the pumped liquid starts to circulate.
- the liquid to be delivered is sucked into the pump 80 from the liquid reservoir 63, pressurized by the pump 80, and sent to the heat exchanger 65.
- the liquid sent to the heat exchanger ⁇ 65 from the pump 80 absorbs the heat generated by the CPU 62 and the liquid temperature rises.
- the liquid to be delivered exchanges heat with the outside air at the next heat sink A66 and heat sink B67 (heat is released to the outside air), the liquid temperature is lowered, and the power also returns to the liquid pool 63. Thereafter, this is repeated and the cooling of the CPU 62 is continued.
- the pump 80 is an internal gear type that is a kind of positive displacement pump, it has the ability to make the suction port have a negative pressure even when it is activated in a dry state (no liquid condition). For this reason, the priming water is used even if it passes through a pipe line higher than the liquid level inside the liquid pool 63 or the pump 80 is located higher than the liquid level. There is a self-priming ability to suck in liquid without any.
- the internal gear pump 80 has a higher pressurization capacity than a centrifugal pump or the like, it can also be applied to conditions in which the pressure loss passing through the heat exchanger 65 and the heat sinks 66 and 67 increases.
- the heat exchange in which the liquid to be delivered becomes the highest temperature.
- the temperature of the liquid reservoir 63 and the pump 80 is kept relatively low. Therefore, the internal parts of the pump 80 are easier to ensure reliability than the high-temperature environment.
- FIG. 1 is a longitudinal sectional view of a motor body type internal gear pump according to an embodiment of the present invention.
- FIG. 2 is a front view showing a cross section of the left half of the pump of FIG.
- FIG. 3 is an exploded perspective view of a pump portion of the pump of FIG.
- FIG. 4 is a cross-sectional view showing a method for joining casings of the pump of FIG.
- FIG. 5 is a dimensional diagram of an inner rotor and an outer rotor of the pump of FIG.
- FIG. 6 is an explanatory diagram of an electronic device including a cooling system having the pump of FIG.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06746995A EP1892415A1 (en) | 2005-05-31 | 2006-05-30 | Motor-integrated internal gear pump, method of producing the gear pump, and electronic apparatus |
US11/883,937 US8033796B2 (en) | 2005-05-31 | 2006-05-30 | Motor-mounted internal gear pump and manufacturing method thereof and electronic equipment |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005-158396 | 2005-05-31 | ||
JP2005158396A JP4237731B2 (ja) | 2005-05-31 | 2005-05-31 | モータ一体型内接歯車式ポンプ及びその製造方法並びに電子機器 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006129657A1 true WO2006129657A1 (ja) | 2006-12-07 |
Family
ID=37481586
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/310767 WO2006129657A1 (ja) | 2005-05-31 | 2006-05-30 | モータ一体型内接歯車式ポンプ及びその製造方法並びに電子機器 |
Country Status (7)
Country | Link |
---|---|
US (1) | US8033796B2 (ja) |
EP (1) | EP1892415A1 (ja) |
JP (1) | JP4237731B2 (ja) |
KR (1) | KR100910434B1 (ja) |
CN (1) | CN100510409C (ja) |
TW (1) | TW200705779A (ja) |
WO (1) | WO2006129657A1 (ja) |
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US8033796B2 (en) | 2005-05-31 | 2011-10-11 | Hitachi, Ltd. | Motor-mounted internal gear pump and manufacturing method thereof and electronic equipment |
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JPWO2020095552A1 (ja) * | 2018-11-09 | 2021-12-23 | 日本電産トーソク株式会社 | 電動オイルポンプ |
KR20210062410A (ko) * | 2019-11-21 | 2021-05-31 | 엘지이노텍 주식회사 | 펌프 |
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KR20210062788A (ko) | 2019-11-21 | 2021-06-01 | 엘지이노텍 주식회사 | 펌프 |
KR20210062787A (ko) * | 2019-11-21 | 2021-06-01 | 엘지이노텍 주식회사 | 펌프 |
CN114616392B (zh) * | 2019-12-24 | 2023-07-28 | 住友电工烧结合金株式会社 | 交联氟树脂涂层转子的制造方法 |
US11428168B2 (en) * | 2020-01-06 | 2022-08-30 | Hamilton Sundstrand Corporation | Starter/generator arrangements for gas turbine engines |
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- 2006-05-30 CN CNB2006800034726A patent/CN100510409C/zh not_active Expired - Fee Related
- 2006-05-30 KR KR1020077018283A patent/KR100910434B1/ko not_active IP Right Cessation
- 2006-05-30 WO PCT/JP2006/310767 patent/WO2006129657A1/ja active Application Filing
- 2006-05-30 US US11/883,937 patent/US8033796B2/en not_active Expired - Fee Related
- 2006-05-30 TW TW095119186A patent/TW200705779A/zh not_active IP Right Cessation
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8033796B2 (en) | 2005-05-31 | 2011-10-11 | Hitachi, Ltd. | Motor-mounted internal gear pump and manufacturing method thereof and electronic equipment |
US20100129239A1 (en) * | 2008-11-07 | 2010-05-27 | Gil Hadar | Fully submerged integrated electric oil pump |
US8632321B2 (en) * | 2008-11-07 | 2014-01-21 | Magna Powertrain Inc. | Fully submerged integrated electric oil pump |
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Also Published As
Publication number | Publication date |
---|---|
JP4237731B2 (ja) | 2009-03-11 |
KR20070100790A (ko) | 2007-10-11 |
US8033796B2 (en) | 2011-10-11 |
JP2006336469A (ja) | 2006-12-14 |
TW200705779A (en) | 2007-02-01 |
CN101111681A (zh) | 2008-01-23 |
CN100510409C (zh) | 2009-07-08 |
TWI309908B (ja) | 2009-05-11 |
EP1892415A1 (en) | 2008-02-27 |
US20080159885A1 (en) | 2008-07-03 |
KR100910434B1 (ko) | 2009-08-04 |
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