fiTRANSPERFECT
`
`1, Michael O’Keeffe, certify that I am fluent (conversant) in the Japanese and English languages, and that
`the attached English document is an accurate translation of the Japanese document attached entitled
`Konishi J?H10-238491. I understand that willful false statements and the like are punishable by fine or
`imprisonment, or both, under Section 1001 of Title 18 of the United States Code.
`
`
`
`Michael O’Keeffe
`
`10 January 2018
`
`LANGUAGE AND TECHNOLOGY SO’LUTIONS FOR GLOBAL BUSINESS
`
`THREE PARK AVENUE, 39TH FLOOR, NEW YORK, NY 10016 I T 212.689.5555 I F 212.689.1059 I WWW.TRANSPERFECT.COM
`OFFECES IN 92 CITEES WORLDWIDE
`
`Am. Honda V. IV 11 - IPR2018-00349
`
`PET_HONDA_1012—0001
`
`Am. Honda v. IV II - IPR2018-00349
`PET_HONDA_1012-0001
`
`

`

`(19) The Japanese Patent Office (JP)
`
`
`
`
`
`
`ID Code
`
`(12) PATENT APPLICATION LAID-OPEN PUBLICATION (A)
`(11) Laid-Open Publication Number:
`No. H10-238491
`(43) Laid-Open Date: September 8, 1998
`
`
`
`
`FI
`
`
`
`(51) Int.Cl.6
`
`(21) Application Number: H09-42370
`(22) Filing Date: February 26, 1997 (71) Applicant: Nikkiso
`K.K., 3-43-2 Ebisu, Shibuya-Ku, Tokyo, Japan
`
`
`Request for Examination (not filed) Number of Claims: 2 OL (total 10 pages)
`(71) Applicant: Nikkiso K.K., 3-43-2 Ebisu, Shibuya-Ku,
`Tokyo, Japan
`(72) Inventors: Yoshiaki KONISHI, c/o Nikkiso K.K.,
`3-43-2 Ebisu, Shibuya-Ku, Tokyo, Japan
`(74) Patent Attorney FUKUMURA Naoki
`
`Canned Motor Pump
`
`
`(54) [Title of Invention]
`
`(57) [Abstract]
`[PROBLEM TO BE SOLVED] Provided is a canned motor
`pump in which the power unit for the inverter device is
`efficiently cooled, and an inverter control unit is prevented
`from being affected by the heat generated in the power
`unit.
`[SOLUTION] The canned motor pump comprises a heat
`transfer pipe disposed on an outer periphery of a stator core
`to conduct handling fluid discharged from a pump unit, and
`a heat transfer means contacting both the heat transfer pipe
`and the heat generating part of the inverter device.
`
`
`
`
`
`Am. Honda v. IV II - IPR2018-00349
`PET_HONDA_1012-0002
`
`

`

`(2)
`
`JPH10-238491A
`
`[0007]
`[Detailed Description of the Preferred Embodiment(s)] As
`discussed above, the canned motor pump of the present
`invention comprises a heat transfer pipe disposed on an
`outer periphery of a stator core to conduct liquid
`discharged from a pump unit configured to draw and
`discharge the liquid, and a heat transfer means contacting
`both the heat transfer pipe and a heat generating part or a
`heat dissipating means of an inverter device.
`Specific embodiments of the canned motor pump of the
`present invention are described in the following.
`[0008] Figure 1 shows an example of a canned motor pump
`in which the heat generating part of an inverter device is
`mounted on a canned motor pump, and heat transfer pipes
`and a stator core are provided in a stator mold part. Figure
`1 is a longitudinal sectional view of the canned pump
`motor taken along a plane containing the central axial line
`of the shaft of the canned motor pump.
`[0009] Figure 2 is a cross sectional view of the canned
`motor pump shown in Figure 1 taken along plane A - A.
`[0010] In the canned motor pump shown in Figure 1, the
`stator core 3 has a substantially hollow cylindrical shape.
`[0011] A stator can 51 having a substantially hollow
`cylindrical shape is inserted and fitted inside the stator core
`3.
`[0012] As shown in Figure 2, a plurality of tooth-shaped
`protrusions 31 project from the inner surface of the stator
`core 3 toward the center thereof, and each tooth-shaped
`protrusion 31 is widened at the tip thereof. Insulated copper
`wire forming stator coils 33 are fitted into gaps 32 defined
`between the adjacent tooth-shaped protrusions 31, and
`packed in a direction in parallel with the tooth-shaped
`protrusions 31. A part of each gap 32 located more inward
`than the corresponding stator coil 33 is filled by the outer
`peripheral part of the stator can 51.
`[0013] Rotor 6 is rotatably provided in a space defined
`inside the stator can 51. The rotor 6 has a shaft 61 which is
`supported by bearings 62 and 63, and a left end part of the
`shaft 61 is fitted with an impeller 71. The inner space of
`the stator can 51 communicates with the inner space of the
`pump unit 7 (which will be described later), and with flow
`passages for handling fluid 81 provided inside an end block
`8 (which will be described later) via the bearings 62 and
`63.
`[0014] As shown in Figure 2, a pair of stainless steel heat
`transfer pipes 1 having a substantially right-angled
`triangular cross section are arranged above the stator core 3
`so as to interpose the stator core 3 therebetween. The two
`heat transfer pipes 1 are each arranged such that two
`mutually orthogonal surfaces of the heat transfer pipe 1
`face outward with respect to the stator core 3. The surface
`of each heat transfer pipe 1 facing the stator core 3 has an
`arcuate shape in cross section extending along the outer
`periphery of the stator core 3.
`
`[Claim(s)]
`[Claim 1] A canned motor pump, comprising: a heat
`transfer pipe disposed on an outer periphery of a stator core
`to conduct liquid discharged from a pump unit configured
`to draw and discharge the liquid; and a heat transfer means
`contacting both the heat transfer pipe and the heat
`generating part or the heat dissipating means of an inverter
`device.
`[Claim 2] The canned motor pump according to claim 1,
`wherein the heat transfer pipe which the pump has is
`connected to the discharge flow passage disgorging liquid .
`[Description]
`[0001]
`[Field of Invention] The present invention relates to a
`canned motor pump, and more particularly to a canned
`motor pump which can efficiently cool a heat generating
`part of an inverter device and eliminate the need for a
`cooling fan for cooling the inverter device.
`[0002]
`[Prior Art] For controlling a motor in a canned motor pump,
`an inverter device including a power unit for directly
`controlling the motor and an inverter control unit for
`controlling the power unit is generally used.
`[0003] Conventionally, the power unit and the inverter
`control unit are accommodated in a single control panel,
`and a cooling fan is provided in the control panel for
`removing the heat generated by the power unit.
`[0004] Since the conventional control panel is provided
`with the power unit, the inverter control unit, and the
`cooling fan as discussed above, the control panel is
`undesirable large in size. In addition, although the control
`panel is provided with the cooling fan as described above,
`the inverter control unit is heated to a high temperature by
`the heat generated by the power unit. Therefore, the
`inverter control unit may be adversely affected by this heat,
`and may send an erroneous instruction to the power unit,
`thereby causing it to malfunction. Furthermore, dust that
`has been drawn by the cooling fan may adhere to the power
`unit and the inverter control unit in the control panel so that
`the deposited dust may be overheated by the heat from the
`power unit, and may even cause a fire. In addition, the
`noise generated by the cooling fan mounted in the control
`panel is problematic.
`[0005] It is an object of the present invention to provide a
`canned motor pump in which the power unit for controlling
`the motor of the canned motor pump is efficiently cooled,
`and the inverter control unit is prevented from being
`affected by the heat generated by the power unit.
`[0006] To achieve such an object, the present invention
`provides (1) a canned motor pump, comprising: a heat
`transfer pipe disposed on an outer periphery of a stator core
`to conduct liquid discharged from a pump unit configured
`to draw and discharge the liquid; and a heat transfer means
`contacting both the heat transfer pipe and the heat
`generating part or the heat dissipating means of an inverter
`device. The present invention further provides (2) a canned
`motor pump provided with a heat transfer pipe having the
`pump means of said (1) connected to a discharge flow
`passage.
`
`
`
`Am. Honda v. IV II - IPR2018-00349
`PET_HONDA_1012-0003
`
`

`

`(3)
`
`JPH10-238491A
`
`[0019] In the canned motor pump shown in Figure 1, the
`heat transfer pipes 1 correspond to the heat transfer pipe in
`the canned motor pump of the present invention, the heat
`transfer plate 2 corresponds to the heat transfer means of
`the canned motor pump of the present invention. The stator
`core 3 corresponds to the stator core of the canned motor
`pump of the present invention. The power unit 41
`corresponds to the heat generating part of the inverter
`device in the canned motor pump of the present invention.
`The pump unit 7 corresponds to the pump unit of the
`canned motor pump of the present invention.
`[0020] The mode of operation of the canned motor pump
`shown in Figure 1 is described in the following.
`[0021] In the canned motor pump of Figure 1, the liquid to
`be pumped flows into the casing 7 from a suction flow
`passage 71, and is discharged from the discharge flow
`passages 73 as indicated by the arrows. The liquid
`discharged from the upper pair of discharge flow passages
`73 passes rightward through the inside of the heat transfer
`pipes 1, and passes through the upper pair of flow passages
`for handling fluid 81 defined in the end block 8 before
`being discharged from the discharge port 83 to the outside.
`The heat generated in the power unit 41 is transferred to
`the heat transfer pipes 1 via the heat transfer plate 2, and is
`released to the outside by the liquid flowing through the
`inside of the heat transfer pipes 1. The heat generated in the
`stator core 3 and the stator coils 33 is also taken out to the
`outside by the liquid flowing through the inside of the heat
`transfer pipes 1.
`[0022] Meanwhile, the liquid discharged from the lower
`pair of discharge flow passages 73 passes through the flow
`passages 52 formed inside the stator mold part 5, and the
`pair of liquid flow passages for handling fluid 81 defined in
`the lower part of the end block 8 before being discharged
`from the discharge port 83 to the outside. The heat
`generated in the stator core 3 and the stator coils 33 is also
`taken out to the outside by the liquid flowing through the
`flow passages 52.
`[0023] Each component of the canned motor pump of the
`present invention is described in the following in greater
`detail.
`[0024] In the canned motor pump of the present invention,
`the heat transfer pipes are disposed on the outer periphery
`of the stator core. The heat transfer pipes are in contact
`with the heat generating part of the inverter device or the
`heat dissipating means for transmitting heat from the heat
`generating part. In the canned motor pump of the present
`invention, the liquid which is drawn into and discharged
`from the pump unit circulates in these heat transfer pipes.
`[0025] It suffices if the heat transfer pipes are disposed on
`the outer periphery of the stator core. The heat transfer
`pipes may be merely subjected to a linear contact or a
`surface contact with the outer periphery of the stator core.
`The heat transfer pipes may be attached to the outer
`periphery of the stator core by using screws or rivets,
`bonding, thermal fusing, welding, brazing or by using any
`other means.
`
`[0015] A heat transfer plate 2 made of stainless steel is
`attached to the upper surfaces of the heat transfer pipes 1.
`The upper surface of the heat transfer plate 2 is in contact
`with a power unit 41 of an inverter device that controls the
`frequency and voltage of the alternating current flowing
`through the stator coils 33. The power unit 41 is protected
`from intrusion of water or the like by a waterproof housing
`42. An inverter control unit for controlling the timing and
`the like for triggering the thyristor of the power unit 41 is
`housed inside a control panel (not shown in the drawings)
`provided at a position remote from the canned motor pump.
`The inverter control unit is coupled to the power unit 41 by
`electric wires that transmit various control commands from
`the inverter control unit to the power unit 41.
`[0016] As shown in Figure 2, the stator core 3 and the heat
`transfer pipes 1 are molded from polydicyclopentadiene,
`thereby covering the stator core 3 and the heat transfer
`pipes 1 and forming a stator mold part 5 having a
`substantially square cross section. Since the heat transfer
`plate 2 is attached to the upper surfaces of the heat transfer
`pipes 1 as discussed above, the upper surfaces of the heat
`transfer pipes 1 are not covered by the stator mold part 5.
`The stator mold part 5 is integrally formed with the stator
`can 51. Further, in the lower half portion of the stator mold
`part 5, or i.e., a part of the stator mold part 5 facing away
`from the part thereof where the heat transfer pipes 1 are
`embedded, a pair of flow passages 52 having a
`substantially right-anged triangular cross section are
`formed on either side of the lower half of the stator core 3.
`The surfaces of the flow passages 52 facing the stator core
`3 are each defined by an arcuate surface extending along
`the outer periphery of the stator core 3.
`[0017] As shown in Figure 1, at one end of the stator mold
`part 5, a pump unit 7 for drawing and discharging the
`liquid to be pumped is provided. The pump unit 7 includes
`an impeller 71 and a casing 70 covering the impeller 71.
`The casing 70 is provided with one suction passage 72
`extending in the same direction as the axis of the shaft 61
`for drawing the liquid into the pump unit 7. A pair of
`discharge flow passages 73 for discharging the pumped
`fluid are formed in a part of the casing 70 adjoining an
`upper end of the impeller 71 or a part of the casing 70
`adjoining the power unit 41. Another pair of discharge flow
`passages 73 for discharging the pumped fluid are formed in
`a part of the casing 70 adjoining a lower end of the
`impeller 71 or a part of the casing 70 facing away from the
`power unit 41, forming a total of two pairs. The upper
`discharge flow passages 73 are connected to the
`corresponding ends of the heat transfer pipes 1, and the
`lower discharge flow passages 73 are connected to the
`respective flow passages 52.
`[0018] The other (axial) end of the stator mold part 5 is
`fixedly connected to the end block 8 having a discharge
`port 83 through which the fluid is discharged to the outside.
`Inside the end block 8, a total of two pairs of liquid flow
`passages for handling fluid 81 are formed, one pair at the
`upper side and another pair at the lower side. The two pairs
`of flow passages for handling fluid 81 merge into one in
`the end block 8 to form a common flow passage 82. The
`right end of the flow passage 82 forms the discharge port
`83. The heat transfer pipes 1 are connected to the upper
`flow passages for handling fluid 81 provided in an upper
`part of the end block 8, and the flow passages 52 are
`connected to the lower flow passages for handling fluid 81
`provided in a lower part of the end block 8.
`
`
`
`Am. Honda v. IV II - IPR2018-00349
`PET_HONDA_1012-0004
`
`

`

`(4)
`
`JPH10-238491A
`
`[0034] Among the above-described reactive liquids, a
`combination of reactive liquids used in
`polydicyclopentadiene RIM is most preferred because
`polydicyclopentadiene has a tensile strength and a rigidity
`comparable to those of metals, and therefore can be formed
`into a can having a thickness of 0.5 to 1.5 mm without
`creating any mechanical strength problem. Furthermore,
`polydicyclopentadiene has a property to increase toughness
`when subjected to heat. This is attributed to the fact that the
`crosslinking of double bonding in the molecules of
`polydicyclopentadiene is promoted by heating.
`[0035] Examples of combinations of reactive liquids for
`producing polydicyclopentadiene include a combination of
`a reactive liquid containing dicyclopentadiene and a
`metallic catalyst, and a reactive liquid containing an
`activator such as dicyclopentadiene and trialkylaluminum.
`[0036] In order to mold the stator core or the like, these
`synthetic resins may be used singly, or as a mixture of such
`synthetic resins and a filler such as glass fiber, ceramic
`fiber and talc may be employed.
`[0037] The method used for molding the stator core or the
`like may consist of RIM, resin transfer molding, reaction
`casting, casting, injection molding or the like. Among these
`methods, the reaction injection molding is particularly
`preferable, since the force required for closing the mold die
`may be small, and large-sized products with complicated
`shapes such as a stator of a canned motor pump can be
`molded with relative ease. The polydicyclopentadiene RIM
`or the RIM using a reactive liquid containing
`dicyclopentadiene as a monomer component is most
`preferable because a stator mold part having a high
`strength can be obtained.
`[0038] When carrying out the molding process, the stator
`can, consisting of a substantially hollow cylindrical
`member inserted into the cavity of the stator core, can also
`be molded integrally with the stator mold part.
`Alternatively, a stator can be made of metal, synthetic resin,
`or fiber reinforced resin may be prepared in advance to be
`inserted in the cavity of the stator core before molding the
`stator core or the like by using the synthetic resin.
`[0039] There are no particular restrictions on the
`cross-sectional shape of the heat transfer pipes, and may be
`provided with a wide range of cross-sectional shapes such
`as triangle, quadrilateral, pentagon, hexagon, other
`polygonal shapes, circular shapes, fan shapes and arcuate
`shapes. Among the various possible shapes, a triangular
`shape, particularly a substantially right-angled triangular
`shape as illustrated in Figures 1 and 2, or a circular shape
`are preferable. In particular, a right-angled triangular shape
`is most preferable because the area of heat transfer to the
`heat transfer means (which will be discussed hereinafter)
`can be maximized.
`
`[0026] In the case where the stator core has an outer
`envelope, the heat transfer pipes may be placed in a surface
`contact or a linear contact with the outer envelope. The
`stator core having an outer envelope may consist of a stator
`core molded with resin so that the stator core is covered by
`a cylindrical body of resin, or a stator core having a
`metallic or plastic outer envelope.
`[0027] Furthermore, the heat transfer pipes may be
`arranged close to the outer periphery of the stator core. In
`particular, the heat transfer pipes may be disposed close to
`the outer periphery of the stator core in such a manner that
`the minimum distance between the outer periphery of the
`stator core and the outer periphery of the heat transfer pipes
`is about 1 to 20 mm. If the stator core is provided with an
`outer envelope, the heat transfer pipes may be disposed
`close to the outer periphery of the envelope of the stator
`core in such a manner that the minimum distance between
`the outer periphery of the envelope of the stator core and
`the outer periphery of the heat transfer pipes is about 1 to
`20 mm.
`[0028] In addition to this, the heat transfer pipes and the
`stator core may be molded with resin with the heat transfer
`pipes in a state placed proximal to the outer surface of the
`stator core so that the heat transfer pipes and the stator core
`are sealed in the synthetic resin, and it is also preferable
`that said heat transfer pipes are in a state embedded in the
`interior of the stator core mold part . In this case also, it is
`preferable that the surfaces or the ridgelines of the heat
`transfer pipes which are to be placed in contact with the
`heat transfer means are exposed from the surface of the
`mold resin of the stator core.
`[0029] Furthermore, it is also preferable that the stator core,
`the heat transfer pipes and the heat transfer means are all
`molded with resin so that the heat transfer pipes and the
`heat transfer means are embedded in the mold resin of the
`stator core. However, in this case also, it is preferable that a
`surface of the heat transfer means in contact with the heat
`generating part or the heat dissipating means of the inverter
`device is exposed on the surface of the mold resin of the
`stator core.
`[0030] Examples of the synthetic resin that can be used for
`molding the stator core and other associated parts include
`various synthetic resins such as a thermosetting resin and a
`thermoplastic resin.
`[0031] Examples of the thermoplastic resins include
`various thermoplastic engineering plastics such as
`polyphenylene sulfide, syndiotactic polystyrene, isotactic
`polystyrene, polyketone, polyether ketone, polyether ether
`ketone, polysulfone, polyether sulfone, aromatic polyester
`and polyamide imide. Examples of the thermosetting resins
`include epoxy resin, phenolic resin, silicone resin and
`polyimide.
`[0032] Further, a synthetic resin obtained by curing a
`reactive liquid containing one or more of compounds
`selected from a group consisting of monomers, oligomers,
`polymerization catalysts, and catalyst promoters may also
`be used.
`[0033]The reactive liquid may consist of any of those
`routinely used in a reaction injection molding method
`(hereinafter referred to as "RIM"). More specifically, the
`reactive liquid may consist of a combination of reactive
`liquids used in polydicyclopentadiene RIM, a combination
`of reactive liquids used in polyester RIM, a combination of
`reactive liquids used in epoxy RIM, and a combination of
`reactive liquids used in nylon RIM, and a combination of
`reactive liquids used in polyurethane RIM, among other
`possibilities.
`
`
`
`Am. Honda v. IV II - IPR2018-00349
`PET_HONDA_1012-0005
`
`

`

`(5)
`
`JPH10-238491A
`
`[0040] There is no limitation as to the material of the heat
`transfer pipes, and can be selected from metallic materials
`such as stainless steel, aluminum alloy, corrosion-resistant
`aluminum alloy, titanium, copper, bronze, brass, nickel
`silver and nickel alloy, ceramics such as alumina, boron
`nitride, silicon carbide and silicon nitride, plastic materials,
`and fiber reinforced plastic materials such as those
`reinforced by glass and carbon fiber. The heat transfer
`pipes may be molded at the same time as the stator mold
`part is formed by RIM.
`[0041] The heat transfer means is not limited to that of the
`illustrated embodiment in terms of shape and material as
`long as the heat transfer means is configured to contact the
`heat transfer pipes so that the heat generated in the heat
`generating part or the heat dissipating part of the inverter
`device can be transferred to the heat transfer pipes.
`[0042] The heat transfer means may consist of a heat
`transfer plate as shown in Figures 1 and 2. The heat
`transfer plate may be provided with one or more fins on
`one side or both sides thereof. The material of the heat
`transfer means may be selected from metallic materials
`such as stainless steel, aluminum alloy, corrosion-resistant
`aluminum alloy, titanium, copper, bronze, brass, nickel
`silver and nickel alloy, ceramics such as alumina, boron
`nitride, silicon carbide and silicon nitride, plastic materials,
`and fiber reinforced plastic materials such as those
`reinforced by glass and carbon fiber. Among such materials,
`metallic material is most preferable because of high
`thermal conductivities.
`[0043] The heat transfer pipes may be placed in contact
`with the heat transfer plate in a number of different ways. A
`side surface of each heat transfer pipe having a circular
`cross section may make a linear contact with the surface of
`the heat transfer plate. A ridge line of each heat transfer
`pipe having a polygonal cross section may make a line
`contact with the surface of the heat transfer plate. A side
`surface of each heat transfer pipe having a polygonal cross
`section may make a surface contact with the surface of the
`heat transfer plate. A side surface of each heat transfer pipe
`may be fitted into a groove formed in the heat transfer plate.
`Alternatively, the heat transfer plate may be provided with
`a projection while each heat transfer pipe is provided with
`a complementary recess so that the projection may be fitted
`into the recess. The shapes of the projection and the recess
`may be freely selected. The projection may consist of a
`discrete projection, or a continuous or discontinuous ridge.
`When the projection consists of a ridge, the corresponding
`recess should be formed as a complementary groove. When
`each heat transfer pipe makes a surface contact with the
`heat transfer plate, a projection may be formed on one of
`the heat transfer pipe and the heat transfer plate while the
`other of the heat transfer pipe and the heat transfer plate is
`provided with a corresponding recess.
`
`
`
`[0044] As a mode of contacting each heat transfer pipe
`with the heat transfer plate, the heat transfer pipe may be
`integrally attached to the heat transfer plate. For instance, a
`part of each heat transfer pipe may consist of a part of the
`heat transfer plate. It can be accomplished, for instance, by
`extruding the heat transfer plate and the heat transfer pipes
`from aluminum alloy material. Alternatively, a metallic
`plate may be bent into a V-shaped or U-shaped cross
`section, and brazed to the surface of the heat transfer plate
`along the open ends of the V-shaped or U-shaped cross
`section so as to form a heat transfer pipe. When the heat
`transfer means consists of a heat transfer plate provided
`with fins on one side or both sides thereof, the heat transfer
`pipes may be placed into contact with the heat transfer
`means by passing or penetrating the heat transfer pipes
`through the fins.
`[0045] Besides the above-mentioned heat transfer plate, the
`heat transfer means may be configured such that two or
`more surfaces of the heat transfer pipe are involved in heat
`transfer. For instance, the canned motor pump may be
`provided with a pair of heat transfer pipes each having a
`triangular cross section disposed adjacent to each other,
`and the surfaces of each heat transfer pipe other than that
`facing the stator core may be involved in heat transfer.
`[0046] When the heat transfer pipe and the heat transfer
`means are provided separately from each other, the heat
`transfer pipe and the heat transfer means may be either
`detachably or permanently connected to each other.
`[0047] The heat transfer pipe and the heat transfer means
`may be detachably connected to each other by fastening the
`heat transfer pipe and the heat transfer means to each other
`with screws, by fitting a projection formed on the contact
`surface of the one of the heat transfer pipe and the heat
`transfer means into a recess formed on the contact surface
`of the other of the heat transfer pipe and the heat transfer
`means, or by magnetically joining the heat transfer pipe
`and the heat transfer means to each other. One of such
`methods may be used or two or more of such methods may
`be combined.
`[0048] The heat transfer pipe and the heat transfer means
`may be permanently connected to each other by using
`screws, rivets, an adhesive agent, thermal fusion, welding
`or brazing among other possibilities.
`[0049] The handling fluid circulates in the heat transfer
`pipes. Therefore, it is preferable that the heat transfer pipe
`is connected to the suction passage of the pump unit into
`which the handling fluid is drawn or to the discharge flow
`passage from which the handling fluid is discharged. From
`the viewpoint of pump efficiency, it is particularly
`preferable that the heat transfer pipe is connected to the
`discharge flow passage.
`[0050] In the present invention, the inverter device
`includes a power unit and an inverter control unit. Further,
`the heat generating part of the inverter device includes a
`portion from which a large amount of heat is generated,
`and typically consists of the power unit. The heat
`generating part of the inverter device may be enclosed in a
`housing or may be molded with epoxy resin. In addition,
`the heat generating part of the inverter device may have
`heat dissipating means such as fins. When the heat
`generating part of the inverter device is molded in an
`enclosed housing, the heat dissipation means may form a
`part of the housing.
`[0051] The heat generating part or the heat dissipating
`means of the inverter device can be brought into contact
`with the heat transfer means in a number of different ways.
`For instance, the power unit may be directly attached to the
`
`Am. Honda v. IV II - IPR2018-00349
`PET_HONDA_1012-0006
`
`

`

`heat transfer means. Alternatively, the power unit may be
`fixedly attached to a metallic chassis which is mounted on
`the heat transfer means. Furthermore, the power unit may
`be mounted on a base provided with heat dissipating fins
`and mounted on the heat transfer means.
`[0052] It is preferable to detachably mount the heat
`generating part or the heat dissipating part of the inverter
`device to the heat transfer means in view of the
`convenience for inspection or replacement of the heat
`generating part of the inverter device. As a method of
`detachably attaching the heat generating part or the heat
`dissipating part of the inverter device to the heat transfer
`means, fastening screws may be used.
`[0053] Another example of the canned motor pump of the
`present invention is described in the following.
`[0054] Figure 3 is a cross sectional view taken along plane
`A-A of Figure 1, and shows an embodiment in which a part
`of the heat transfer plate 2 is formed by a part of the heat
`transfer pipes 1 of the canned motor pump which is
`otherwise similar to that shown in Figure 1.
`[0055] In the canned motor pump shown in Figure 3, the
`stator core 3 and the stator mold part 5 are similar in
`structure to those of the canned motor pump of Figure 1.
`The canned motor pump shown in Figure 3 is similar to the
`canned motor pump shown in Figure 1 also in that the
`power unit 41 of the inverter device is mounted on the heat
`transfer plate 2. Furthermore, the canned motor pump
`shown in Figure 3 is similar to the canned motor pump
`shown in Figure 1 in that a pump unit 7 is provided on one
`end of the stator mold part 5 (although not shown in Figure
`3), and an end block 8 is provided on the other end of the
`stator mold part 5 (although not shown in Figure 3), and a
`pair of heat transfer pipes 1 each having a substantially
`right-angled triangular cross section are provided on either
`side of an upper half of the stator core 3, and embedded in
`the stator mold part 5.
`[0056] In the canned motor pump of Figure 3, the heat
`transfer pipes 1 and the heat transfer plate 2 are integrated
`in such manner that a part of the heat transfer plate 2 forms
`a part of the heat transfer pipes 1. A pair of V-shaped
`members 11 each formed by bending a stainless steel plate
`into a substantially V-shaped cross section are fixed to the
`lower surface of the heat transfer plate 2 made of stainless
`steel. The upper end portions of the V-shaped members 11
`are each bent inward to define a horizontal surface, and are
`fixedly secured to the heat transfer plate 2 at the horizontal
`surfaces thereof.
`[0057] In the canned motor pump shown in Figure 3, the
`heat transfer pipes 1 correspond to the heat transfer pipe in
`the canned motor pump of the present invention, the heat
`transfer plate 2 corresponds to the heat transfer means of
`the canned motor pump of the present invention. The stator
`core 3 corresponds to the stator core of the canned motor
`pump of the present invention. The power unit 41
`corresponds to the heat generating part of the inverter
`device in the canned motor pump of the present invention.
`The pump unit 7 corresponds to the pump unit of the
`canned motor pump of the present invention.
`[0058] Figure 4 is a cross sectional view taken along plane
`A-A of Figure 1, and shows an embodiment in which the
`heat dissipating part of the inverter device is attached to the
`upper surface of the heat transfer plate 2.
`
`(6)
`
`JPH10-238491A
`
`[0059] In the canned motor pump shown in Figure 4, the
`stator core 3 and the stator mold part 5 are similar in
`structure to those of the canned motor pump of Figure 1.
`Furthermore, the canned motor pump shown in Figure 4 is
`similar to the canned motor pump shown in Figure 1 in that
`a pump unit 7 is provided on one end of the stator mold
`part 5 (although not shown in Figure 4), and an end block 8
`is provided on the other end of the stator mold part 5
`(although not shown in Figure 4), and a pair of heat
`transfer pipes 1 each having a substantially right-angled
`triangular cros