US20190368495A1 - Centrifugal pump - Google Patents
Centrifugal pump Download PDFInfo
- Publication number
- US20190368495A1 US20190368495A1 US16/098,070 US201716098070A US2019368495A1 US 20190368495 A1 US20190368495 A1 US 20190368495A1 US 201716098070 A US201716098070 A US 201716098070A US 2019368495 A1 US2019368495 A1 US 2019368495A1
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- US
- United States
- Prior art keywords
- flow path
- pump body
- side scroll
- suction
- impeller
- 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
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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
- 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
- F04D13/0666—Units comprising pumps and their driving means the pump being electrically driven the motor being of the plane gap type
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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
- F04D13/0646—Units comprising pumps and their driving means the pump being electrically driven the hollow pump or motor shaft being the conduit for the working fluid
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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
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal 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
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
- F04D29/4273—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps suction eyes
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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
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
- F04D29/4293—Details of fluid inlet or outlet
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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
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
-
- 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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
- H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
Definitions
- the present invention relates to a centrifugal pump which circulates, for example, a cooling fluid.
- Conventional electronic apparatuses such as notebook personal computers are provided with high-heat-generating electronic components, such as an LED, a CPU, and an MPU, and a centrifugal pump is used for fluid circulation to cool a control circuit equipped with these components.
- high-heat-generating electronic components such as an LED, a CPU, and an MPU
- a centrifugal pump is used for fluid circulation to cool a control circuit equipped with these components.
- centrifugal pump in which a suction side flow path for fluid, through which a fluid is usually suctioned from the center in the axial direction of an impeller, is pressurized while being scrolled, and is then discharged from the circumferential direction thereof, is formed to be bent by 90° in such a way as to be parallel to a discharge side flow path has been proposed (see PTL 1).
- the suction side flow path forms flow paths orthogonal inside a base, is not seen uniform in the flow path cross-sectional area, and has a configuration with a high degree of flow path loss.
- a back yoke equipped with a coil configuring the axial gap-type motor is formed by being molded inside the base, the thickness of the base is apt to become thick, so that the suction side flow path cross-sectional area formed in the base cannot be secured wide.
- the suction side flow path flows into a pump chamber side through the inside of a hollow fixed shaft of the impeller, it is necessary to form the suction side flow path across the back yoke in the radial direction. Accordingly, since it is necessary to equip the back yoke with an intermittent portion, a coli cannot be located in such a portion, so that the flux content decreases, the effective magnetic flux acting on a rotor also decreases, and the motor characteristic is also apt to deteriorate.
- the present invention has the following configuration.
- a centrifugal pump that causes a radial gap-type electric motor to rotationally drive an impeller to suction a fluid from an outer circumference side of a pump body into a pump chamber and discharge the fluid from the pump chamber via the outer circumference side of the pump body
- the centrifugal pump including a base portion, a rotor shaft having at least one end prevented from dropping off and supported by the base portion in a standing manner, the impeller rotatably attached to the rotor shaft, a rotor including a rotor magnet mounted to the impeller in a concentric fashion, and the pump body in which a suction side scroll flow path that suctions the fluid from an outer circumference side of the impeller toward a radially central portion thereof, a discharge side scroll flow path that discharges the fluid from the radially central portion of the impeller toward the outer circumference side thereof, and a stator including a stator core having stator pole teeth formed and placed to face radially the rotor magnet are integrally mounted, wherein the rot
- the suction side scroll flow path and the discharge side scroll flow path formed in the pump body communicate with each other via the central flow paths formed in the pump body and the impeller, thinning can be achieved even when a radial gap-type motor is used. Moreover, since a flow path loss leading from the suction side scroll flow path to the discharge side scroll flow path is small and the fluid passes in such a manner that these surround both end surface sides in the axial direction of the stator core, the heat generated by the coil can be efficiently dissipated.
- the suction side scroll flow path include a suction hole provided on an outer circumference surface of the pump body and a suction side scroll groove partitioned in such a manner that the fluid entering from the suction hole is guided toward a suction side central hole while revolving in a circumferential direction and formed in such a manner that a groove depth thereof becomes shallower as the groove depth goes from the suction hole toward the suction side central hole.
- suction side scroll flow path be formed between the suction side scroll groove formed on one end surface in the axial direction of the pump body and another base portion superposed on the one end surface in the axial direction.
- the height in the axial direction of the pump body can be restricted, thinning can be promoted, and assembling can be performed by superposing the pump body on the base portion, so that good assembly productivity can also be obtained.
- the discharge side scroll flow path include a discharge side central hole formed in such a way as to communicate with the suction side central hole via the central flow paths and a discharge side scroll groove partitioned in such a manner that the fluid is guided from the discharge side central hole to a discharge hole provided on an outer circumference surface of the pump body while revolving and formed in such a manner that a groove depth thereof becomes deeper as the groove depth goes from the discharge side central hole toward the discharge hole.
- the fluid suctioned from the central flow path to the discharge side central hole is pressurized by rotation of the impeller, is guided along the discharge side scroll groove, in which the groove depth thereof becomes gradually deeper as the groove depth goes from the discharge side central hole toward the discharge hole, and is then discharged from a discharge port.
- the height of the pump chamber is unnecessary, and no loss occurs in the flow path even if thinning is achieved.
- the discharge side scroll flow path be formed between the discharge side scroll groove formed on the other end surface in the axial direction of the pump body and one base portion superposed on the other end surface in the axial direction.
- the height in the axial direction of the pump body can be restricted, thinning can be promoted, and assembling can be performed by superposing the pump body on the base portion, so that good assembly productivity can also be obtained.
- a shallow groove and a deep groove be placed while being combined such that groove bottom portions thereof are close to each other in such a manner that a flow velocity of the fluid becomes uniform in the suction side scroll flow path and the discharge side scroll flow path.
- the volume of the pump chamber can be prevented from increasing in the axial direction, thinning can be promoted, and the flow path loss leading from a suction port to a discharge port can be reduced as much as possible, so that the pump performance can be maintained.
- the impeller can include an annular portion, to which the rotor is mounted, and a blade portion, which is mounted to the rotor shaft, the annular portion and the blade portion being molded integrally with each other.
- the rotor and the impeller can be concurrently mounted to the rotor shaft, and the location in the axial direction can be made compact.
- a centrifugal pump which is capable of achieving thinning thereof with use of a radial gap-type motor, is smaller in the flow path loss from a suction flow path to a discharge flow path, and is capable of efficiently dissipating heat generated by a coil without inclusion of an extra cooling structure can be provided.
- FIG. 1 is a perspective view of a centrifugal pump.
- FIG. 2 is a sectional view in the direction of arrow X-X in FIG. 1 .
- FIGS. 3A and 3B are a top half view obtained by seeing through a base portion and a sectional view in the direction of arrow Y-Y in FIG. 1 .
- FIGS. 4A and 4B are a suction side perspective view and a discharge side perspective view of a pump body.
- centrifugal pump which rotationally drives an impeller using an inner rotor-type motor of the radial gap type is described as an example.
- a DC brushless motor is used as the inner rotor-type motor.
- a centrifugal pump 1 causes a radial gap-type electric motor to rotationally drive an impeller 9 to suction a fluid from a suction port 3 formed on an outer circumference of a pump body 2 and discharge the fluid from a discharge port 4 formed on the outer circumference of the pump body 2 .
- a pair of plate-like base portions 5 a, 5 b is superposed on the pump body 2 , which is molded with resin, in such a way as to sandwich both end surfaces thereof, and fixing bolts 6 are screw-fitted into outer periphery portions of the base portions 5 a, 5 b, which face each other via the pump body 2 , so that the base portions 5 a, 5 b and the pump body 2 are integrally mounted.
- a rotor shaft 7 is supported and fixed in a standing manner at the base portion 5 a, which is one of the pair of base portions 5 a, 5 b.
- the impeller 9 is integrally mounted to the rotor shaft 7 via a sliding bearing 8 .
- the impeller 9 is prevented from dropping off by a C-type retaining ring 7 a via a thrust receiver 7 b at the other end of the rotor shaft 7 , thus being mounted integrally with the rotor shaft 7 .
- a rotor 13 is integrally mounted to the impeller 9 .
- the impeller 9 includes an annular portion 9 a, which forms a central flow path 10 a, and a blade portion 9 b, which conveys the fluid from the central portion toward the outer circumference side, the annular portion 9 a and the blade portion 9 b being molded integrally with each other.
- An annular back yoke 11 is integrally mounted to the outer circumference surface of the annular portion 9 a and a rotor magnet 12 is integrally mounted to the outer circumference side thereof via, for example, adhesion or insert molding.
- the rotor magnet 12 can be a magnet previously molded in an annular shape or a magnet divided into a plurality of segments. Moreover, a stepped portion 9 c is formed at a suction side opening portion of the annular portion 9 a. Furthermore, in a case where the impeller 9 and the rotor 13 are molded integrally with each other, for example, in view of durability or the like, it is desirable that those be integrally molded with, for example, polyphenylene sulfide (PPS).
- PPS polyphenylene sulfide
- a central flow path 10 a (a hollow hole) is formed along the axial direction around a connection portion of the impeller 9 with the rotor shaft 7 .
- This central flow path 10 a is formed in such a way as to communicate with a central flow path 10 b formed in the pump body 2 , as described below.
- a suction side scroll flow path 14 which is used to suction the fluid from the outer circumference side of the impeller 9 toward the radially central portion thereof
- a discharge side scroll flow path 15 which is used to discharge the fluid from the central portion of the impeller 9 toward the outer circumference side thereof, are arranged to communicate with each other via the central flow paths 10 a, 10 b.
- the suction side scroll flow path 14 which is used to suction the fluid from the outer circumference side of the impeller 9 toward the central portion of a pump chamber 16 in the radial direction, is formed at one end portion 2 a in the axial direction of the pump body 2 .
- the suction side scroll flow path 14 is formed between a suction side scroll groove (recessed portion) 14 a, which is formed at the one end portion 2 a in the axial direction of the pump body 2 , and the base portion 5 b, which is mounted to be superposed on the end surface in the axial direction in such a way as to cover the suction side scroll groove 14 a.
- the one end portion 2 a in the axial direction extends to the radially inner side in such a way as to cover the annular portion 9 a of the impeller 9 , and a lip portion 2 c (a return structure), which is formed in an L-shaped manner from that end portion, is formed.
- the lip portion 2 c is located in such a way as to mesh with the stepped portion 9 c of the annular portion 9 a.
- the inner circumference surface of the lip portion 2 c forms the central flow path 10 b, which communicates with the central flow path 10 a. With this, the fluid can be prevented from flowing back from a gap between the impeller 9 and the pump body 2 toward the central flow path 10 a.
- the discharge side scroll flow path 15 which is used to discharge the fluid from the central portion of the impeller 9 toward the outer circumference side thereof in the radial direction, is formed at the other end portion 2 b in the axial direction of the pump body 2 .
- the discharge side scroll flow path 15 is formed between a discharge side scroll groove (recessed portion) 15 a, which is formed at the other end portion 2 b in the axial direction of the pump body 2 , and the base portion 5 a.
- the pump chamber 16 which is provided in the pump body 2 , is formed by causing the suction side scroll flow path 14 and the discharge side scroll flow path 15 to communicate with each other via the central flow paths 10 a, 10 b.
- the suction side scroll flow path 14 and the discharge side scroll flow path 15 do not necessarily need to be formed between the end portion in the axial direction of the pump body 2 and the base portion, and, instead of the base portion, another member can be employed.
- a stator 17 is mounted to the pump body 2 .
- the stator 17 includes a stator core 17 c in which stator pole teeth 17 b are radially provided in a protruding manner from a core back portion 17 a formed in an annular manner toward the radially inner side.
- a coil 17 d is wound around each stator pole tooth 17 b.
- the pump body 2 is mounted to the base portions 5 a, 5 b in such a manner that the stator pole teeth 17 b face the rotor magnet 12 in the radial direction, so that the suction side scroll flow path 14 and the discharge side scroll flow path 15 communicate with each other via the central flow paths 10 b, 10 a formed in the impeller 9 .
- the suction side scroll flow path 14 which is used to suction the fluid from the outer circumference side of the impeller 9 (annular portion 9 a ) toward the radially central portion thereof
- the discharge side scroll flow path 15 which is used to discharge the fluid from the central portion of the impeller 9 (blade portion 9 b ) toward the outer circumference side thereof, communicate with each other via the central flow paths 10 b, 10 a formed in the pump body 2 and the impeller 9 , thinning can be achieved even if a radial gap-type motor is used.
- FIG. 4A is a perspective view illustrating the one end portion 2 a in the axial direction of the pump body 2 , in which the suction side scroll flow path 14 is formed.
- the fluid which has entered from a suction hole 14 b provided on the outer circumference surface of the pump body 2 , is guided toward a suction side central hole 14 c while revolving in the circumferential direction.
- a suction side scroll groove 14 a is partitioned by a partition wall 14 d, and is formed in a revolving shape in such a manner that the groove depth thereof becomes gradually shallower as the groove depth goes from the suction hole 14 b toward the suction side central hole 14 c (the lip portion 2 c: see FIG. 3B ).
- the fluid which has been suctioned into the pump chamber 16 via the suction hole 14 b, is guided toward the suction side central hole 14 c while revolving along the suction side scroll groove 14 a.
- the groove depth becomes gradually shallower as the groove depth goes toward the suction side central hole 14 c, the fluid is guided through the central flow path 10 b to the central flow path 10 a on the side of the impeller 9 in the axial direction.
- the height of the pump chamber 16 is unnecessary, so that no loss occurs in the flow path even if thinning is achieved.
- FIG. 4B is a perspective view illustrating the other end portion 2 b in the axial direction of the pump body 2 , in which the discharge side scroll flow path 15 is formed.
- the fluid which has entered from a discharge side central hole 15 b through the central flow path 10 a, is guided to a discharge hole 15 c provided on the outer circumference surface of the pump body 2 while revolving in the circumferential direction along the blade portion 9 b of the impeller 9 .
- the discharge side scroll groove 15 a is partitioned by a partition wall 15 d, and is formed in a revolving shape in such a manner that the groove depth thereof becomes gradually deeper as the groove depth goes from the discharge side central hole 15 b toward the discharge hole 15 c.
- the fluid which has flowed from the central flow path 10 a into the discharge side central hole 15 b, is pressurized by rotation of the impeller 9 (the blade portion 9 b ) and is guided toward the outer circumference surface of the pump body 2 . More specifically, the pressurized fluid is conveyed while revolving along the discharge side scroll groove 15 a, the groove depth of which becomes gradually deeper as the groove depth goes from the discharge side central hole 15 b toward the discharge hole 15 c, and is then discharged from the discharge port 4 . At this time, while the fluid moves in a revolving manner in the pump body 2 , the height of the pump chamber 16 is unnecessary, so that no loss occurs in the flow path even if thinning is achieved.
- the suction side scroll groove 14 a and the discharge side scroll groove 15 a be formed in such a way as to be symmetric with respect to a point in such a manner that the flow velocity of the fluid flowing in these grooves becomes uniform.
- the suction side scroll groove 14 a and the discharge side scroll groove 15 a are formed in such a manner that a shallow groove and a deep groove are combined such that the groove bottom portions thereof are close to each other on the end surfaces in the axial direction of the pump body 2 .
- the shallow groove and the deep groove are formed in combination on the end surfaces in the axial direction of the pump body 2 in such a manner that the flow velocity of the fluid flowing in the suction side scroll groove 14 a and the discharge side scroll groove 15 a, which are formed by partitioning in the radial direction in the pump chamber 16 , becomes uniform, there is no increase in the volume of the pump chamber 16 in the axial direction, thinning can be promoted, and the flow path loss leading from the suction port 3 to the discharge port 4 can reduced as much as possible, so that the pump performance can be maintained.
- annular seal members 18 , 19 (for example, O rings) be provided between the pump body 2 and a pair of base portions 5 a, 5 b, which are superposed on the pump body 2 . With this, the sealing performance for fluid of the suction side scroll flow path 14 and the discharge side scroll flow path 15 can be enhanced.
- the fluid is suctioned from the suction port 3 through the suction side scroll flow path 14 , and the fluid suctioned from the suction hole 14 b into the pump chamber 16 is guided to the suction side scroll groove 14 a and is then conveyed toward the suction side central hole 14 c while revolving (see FIG. 4A ).
- the fluid is conveyed from the suction side central hole 14 c to the discharge side central hole 15 b through the central flow paths 10 a, 10 b (see FIG. 3B ).
- the fluid which has flowed from the central flow path 10 a into the discharge side central hole 15 b, is guided toward the outer circumference surface of the pump body 2 while revolving along the discharge side scroll groove 15 a by rotation of the impeller 9 , is pressurized toward the discharge hole 15 c from the discharge side central hole 15 b through the discharge side scroll flow path 15 , and is then discharged from the discharge port 4 (see FIG. 4B ).
- the centrifugal pump 1 in which thinning is achieved with use of a radial gap-type electric motor, the flow path loss leading from the suction side scroll flow path 14 to the discharge side scroll flow path 15 is small, and the heat generated by the coil 17 d can be efficiently dissipated without inclusion of an extra cooling structure, can be provided.
- the impeller 9 which is mounted in a concentric manner around the rotor shaft 7 , includes the annular portion 9 a and the blade portion 9 b integrally molded with resin, but can be configured with separate components.
- the rotor 13 and the impeller 9 can be configured to be rotated integrally with the rotor shaft 7 .
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
A centrifugal pump is provided which is capable of achieving thinning thereof with use of a radial gap-type motor, is smaller in the flow path loss from a suction flow path to a discharge flow path, and is capable of efficiently dissipating heat generated by a coil without inclusion of an extra cooling structure.
A rotor (13) and a pump body (2) are arranged in a concentric manner around a rotor shaft (7), and a suction side scroll flow path (14) and a discharge side scroll flow path (15) formed in the pump body (2) communicate with each other via central flow paths (10 b), (10 a) formed in the pump body (2) and an impeller (9).
Description
- The present invention relates to a centrifugal pump which circulates, for example, a cooling fluid.
- Conventional electronic apparatuses such as notebook personal computers are provided with high-heat-generating electronic components, such as an LED, a CPU, and an MPU, and a centrifugal pump is used for fluid circulation to cool a control circuit equipped with these components.
- Moreover, to promote miniaturization and thinning of an electronic apparatus, it is also necessary to achieve thinning of a centrifugal pump. For that purpose, a centrifugal pump in which a suction side flow path for fluid, through which a fluid is usually suctioned from the center in the axial direction of an impeller, is pressurized while being scrolled, and is then discharged from the circumferential direction thereof, is formed to be bent by 90° in such a way as to be parallel to a discharge side flow path has been proposed (see PTL 1).
- Moreover, since a suction flow path is formed in a casing, the thickness of the casing becomes thick, and, therefore, a centrifugal pump in which an axial gap-type motor is employed instead of a radial gap-type motor as a motor which rotationally drives an impeller has also been proposed (see PTL 2).
- PTL 1: JP-A-2001-132699
- PTL 2: JP-A-2009-8055
- While thinning can be achieved in a centrifugal pump in which the above-mentioned axial gap-type motor is employed, the suction side flow path forms flow paths orthogonal inside a base, is not seen uniform in the flow path cross-sectional area, and has a configuration with a high degree of flow path loss. In particular, since a back yoke equipped with a coil configuring the axial gap-type motor is formed by being molded inside the base, the thickness of the base is apt to become thick, so that the suction side flow path cross-sectional area formed in the base cannot be secured wide.
- Moreover, since the suction side flow path flows into a pump chamber side through the inside of a hollow fixed shaft of the impeller, it is necessary to form the suction side flow path across the back yoke in the radial direction. Accordingly, since it is necessary to equip the back yoke with an intermittent portion, a coli cannot be located in such a portion, so that the flux content decreases, the effective magnetic flux acting on a rotor also decreases, and the motor characteristic is also apt to deteriorate.
- Furthermore, since the suction side flow path is formed while avoiding the coil, the heat generated by the coil cannot be efficiently dissipated. If a cooling structure is additionally provided, thinning cannot be achieved and manufacturing costs also increase.
- In response to the above issue, it is an object of the present invention to provide a centrifugal pump which is capable of achieving thinning thereof with use of a radial gap-type motor, is smaller in the flow path loss from a suction flow path to a discharge flow path, and is capable of efficiently dissipating heat generated by a coil without inclusion of an extra cooling structure.
- In order to attain the above-mentioned object, the present invention has the following configuration.
- A centrifugal pump that causes a radial gap-type electric motor to rotationally drive an impeller to suction a fluid from an outer circumference side of a pump body into a pump chamber and discharge the fluid from the pump chamber via the outer circumference side of the pump body, the centrifugal pump including a base portion, a rotor shaft having at least one end prevented from dropping off and supported by the base portion in a standing manner, the impeller rotatably attached to the rotor shaft, a rotor including a rotor magnet mounted to the impeller in a concentric fashion, and the pump body in which a suction side scroll flow path that suctions the fluid from an outer circumference side of the impeller toward a radially central portion thereof, a discharge side scroll flow path that discharges the fluid from the radially central portion of the impeller toward the outer circumference side thereof, and a stator including a stator core having stator pole teeth formed and placed to face radially the rotor magnet are integrally mounted, wherein the rotor and the pump body are placed in a concentric fashion around the rotor shaft, and the suction side scroll flow path and the discharge side scroll flow path formed in the pump body communicate with each other via central flow paths formed in the pump body and the impeller.
- According to the above-mentioned configuration of the centrifugal pump, since the suction side scroll flow path and the discharge side scroll flow path formed in the pump body communicate with each other via the central flow paths formed in the pump body and the impeller, thinning can be achieved even when a radial gap-type motor is used. Moreover, since a flow path loss leading from the suction side scroll flow path to the discharge side scroll flow path is small and the fluid passes in such a manner that these surround both end surface sides in the axial direction of the stator core, the heat generated by the coil can be efficiently dissipated.
- It is desirable that the suction side scroll flow path include a suction hole provided on an outer circumference surface of the pump body and a suction side scroll groove partitioned in such a manner that the fluid entering from the suction hole is guided toward a suction side central hole while revolving in a circumferential direction and formed in such a manner that a groove depth thereof becomes shallower as the groove depth goes from the suction hole toward the suction side central hole.
- With this, since the fluid suctioned from the suction hole into the pump body is guided toward the suction side central hole while revolving along the suction side scroll groove and the groove depth becomes gradually shallower as the groove depth goes toward the suction side central hole, the fluid is guided to the impeller side in the axial direction via the central flow path. At this time, the height of the pump chamber is unnecessary, and no loss occurs in the flow path even if thinning is achieved.
- It is desirable that the suction side scroll flow path be formed between the suction side scroll groove formed on one end surface in the axial direction of the pump body and another base portion superposed on the one end surface in the axial direction.
- With this, the height in the axial direction of the pump body can be restricted, thinning can be promoted, and assembling can be performed by superposing the pump body on the base portion, so that good assembly productivity can also be obtained.
- It is desirable that the discharge side scroll flow path include a discharge side central hole formed in such a way as to communicate with the suction side central hole via the central flow paths and a discharge side scroll groove partitioned in such a manner that the fluid is guided from the discharge side central hole to a discharge hole provided on an outer circumference surface of the pump body while revolving and formed in such a manner that a groove depth thereof becomes deeper as the groove depth goes from the discharge side central hole toward the discharge hole.
- With this, the fluid suctioned from the central flow path to the discharge side central hole is pressurized by rotation of the impeller, is guided along the discharge side scroll groove, in which the groove depth thereof becomes gradually deeper as the groove depth goes from the discharge side central hole toward the discharge hole, and is then discharged from a discharge port. At this time, the height of the pump chamber is unnecessary, and no loss occurs in the flow path even if thinning is achieved.
- It is desirable that the discharge side scroll flow path be formed between the discharge side scroll groove formed on the other end surface in the axial direction of the pump body and one base portion superposed on the other end surface in the axial direction.
- With this, the height in the axial direction of the pump body can be restricted, thinning can be promoted, and assembling can be performed by superposing the pump body on the base portion, so that good assembly productivity can also be obtained.
- It is desirable that, on end surfaces in the axial direction of the pump body, a shallow groove and a deep groove be placed while being combined such that groove bottom portions thereof are close to each other in such a manner that a flow velocity of the fluid becomes uniform in the suction side scroll flow path and the discharge side scroll flow path.
- With this, since a shallow groove and a deep groove are placed while being combined such that groove bottom portions thereof are close to each other in such a manner that the flow velocity of the fluid becomes uniform in the suction side scroll groove and the discharge side scroll groove formed while being radially partitioned in the pump chamber, the volume of the pump chamber can be prevented from increasing in the axial direction, thinning can be promoted, and the flow path loss leading from a suction port to a discharge port can be reduced as much as possible, so that the pump performance can be maintained.
- The impeller can include an annular portion, to which the rotor is mounted, and a blade portion, which is mounted to the rotor shaft, the annular portion and the blade portion being molded integrally with each other.
- With this, the rotor and the impeller can be concurrently mounted to the rotor shaft, and the location in the axial direction can be made compact.
- A centrifugal pump which is capable of achieving thinning thereof with use of a radial gap-type motor, is smaller in the flow path loss from a suction flow path to a discharge flow path, and is capable of efficiently dissipating heat generated by a coil without inclusion of an extra cooling structure can be provided.
-
FIG. 1 is a perspective view of a centrifugal pump. -
FIG. 2 is a sectional view in the direction of arrow X-X inFIG. 1 . -
FIGS. 3A and 3B are a top half view obtained by seeing through a base portion and a sectional view in the direction of arrow Y-Y inFIG. 1 . -
FIGS. 4A and 4B are a suction side perspective view and a discharge side perspective view of a pump body. - Hereinafter, an embodiment of a centrifugal pump according to the present invention will be described with reference to the accompanying drawings illustrated in
FIG. 1 toFIGS. 4A and 4B . In the present embodiment, a centrifugal pump which rotationally drives an impeller using an inner rotor-type motor of the radial gap type is described as an example. A DC brushless motor is used as the inner rotor-type motor. - In
FIG. 1 , a centrifugal pump 1 causes a radial gap-type electric motor to rotationally drive animpeller 9 to suction a fluid from asuction port 3 formed on an outer circumference of apump body 2 and discharge the fluid from adischarge port 4 formed on the outer circumference of thepump body 2. - A pair of plate-
like base portions pump body 2, which is molded with resin, in such a way as to sandwich both end surfaces thereof, and fixingbolts 6 are screw-fitted into outer periphery portions of thebase portions pump body 2, so that thebase portions pump body 2 are integrally mounted. - Next, a structure of the centrifugal pump 1 is described in detail with reference to
FIG. 2 . - One end of a
rotor shaft 7 is supported and fixed in a standing manner at thebase portion 5 a, which is one of the pair ofbase portions impeller 9 is integrally mounted to therotor shaft 7 via a sliding bearing 8. Theimpeller 9 is prevented from dropping off by a C-type retaining ring 7 a via athrust receiver 7 b at the other end of therotor shaft 7, thus being mounted integrally with therotor shaft 7. - In
FIGS. 2 and 3B , arotor 13 is integrally mounted to theimpeller 9. Theimpeller 9 includes anannular portion 9 a, which forms acentral flow path 10 a, and a blade portion 9 b, which conveys the fluid from the central portion toward the outer circumference side, theannular portion 9 a and the blade portion 9 b being molded integrally with each other. Anannular back yoke 11 is integrally mounted to the outer circumference surface of theannular portion 9 a and arotor magnet 12 is integrally mounted to the outer circumference side thereof via, for example, adhesion or insert molding. With this, therotor 13 and theimpeller 9 can be concurrently mounted to therotor shaft 7 in a concentric fashion, and the location in the axial direction can be made compact. Therotor magnet 12 can be a magnet previously molded in an annular shape or a magnet divided into a plurality of segments. Moreover, astepped portion 9 c is formed at a suction side opening portion of theannular portion 9 a. Furthermore, in a case where theimpeller 9 and therotor 13 are molded integrally with each other, for example, in view of durability or the like, it is desirable that those be integrally molded with, for example, polyphenylene sulfide (PPS). - Moreover, a
central flow path 10 a (a hollow hole) is formed along the axial direction around a connection portion of theimpeller 9 with therotor shaft 7. Thiscentral flow path 10 a is formed in such a way as to communicate with acentral flow path 10 b formed in thepump body 2, as described below. More specifically, a suction sidescroll flow path 14, which is used to suction the fluid from the outer circumference side of theimpeller 9 toward the radially central portion thereof, and a discharge sidescroll flow path 15, which is used to discharge the fluid from the central portion of theimpeller 9 toward the outer circumference side thereof, are arranged to communicate with each other via thecentral flow paths - Next, a structure of the
pump body 2 is described. - In
FIG. 2 , the suction sidescroll flow path 14, which is used to suction the fluid from the outer circumference side of theimpeller 9 toward the central portion of apump chamber 16 in the radial direction, is formed at oneend portion 2 a in the axial direction of thepump body 2. Specifically, the suction sidescroll flow path 14 is formed between a suction side scroll groove (recessed portion) 14 a, which is formed at the oneend portion 2 a in the axial direction of thepump body 2, and thebase portion 5 b, which is mounted to be superposed on the end surface in the axial direction in such a way as to cover the suctionside scroll groove 14 a. Moreover, the oneend portion 2 a in the axial direction extends to the radially inner side in such a way as to cover theannular portion 9 a of theimpeller 9, and alip portion 2 c (a return structure), which is formed in an L-shaped manner from that end portion, is formed. Thelip portion 2 c is located in such a way as to mesh with the steppedportion 9 c of theannular portion 9 a. The inner circumference surface of thelip portion 2 c forms thecentral flow path 10 b, which communicates with thecentral flow path 10 a. With this, the fluid can be prevented from flowing back from a gap between theimpeller 9 and thepump body 2 toward thecentral flow path 10 a. - Moreover, in
FIG. 2 , the discharge sidescroll flow path 15, which is used to discharge the fluid from the central portion of theimpeller 9 toward the outer circumference side thereof in the radial direction, is formed at theother end portion 2 b in the axial direction of thepump body 2. Specifically, the discharge sidescroll flow path 15 is formed between a discharge side scroll groove (recessed portion) 15 a, which is formed at theother end portion 2 b in the axial direction of thepump body 2, and thebase portion 5 a. Thepump chamber 16, which is provided in thepump body 2, is formed by causing the suction sidescroll flow path 14 and the discharge sidescroll flow path 15 to communicate with each other via thecentral flow paths scroll flow path 14 and the discharge sidescroll flow path 15 do not necessarily need to be formed between the end portion in the axial direction of thepump body 2 and the base portion, and, instead of the base portion, another member can be employed. - Moreover, as illustrated in
FIG. 3A , astator 17 is mounted to thepump body 2. Thestator 17 includes astator core 17 c in whichstator pole teeth 17 b are radially provided in a protruding manner from a core backportion 17 a formed in an annular manner toward the radially inner side. Acoil 17 d is wound around eachstator pole tooth 17 b. - As illustrated in
FIGS. 3A and 3B , thepump body 2 is mounted to thebase portions stator pole teeth 17 b face therotor magnet 12 in the radial direction, so that the suction sidescroll flow path 14 and the discharge sidescroll flow path 15 communicate with each other via thecentral flow paths impeller 9. - According to the above-described configuration of the centrifugal pump 1, since the suction side
scroll flow path 14, which is used to suction the fluid from the outer circumference side of the impeller 9 (annular portion 9 a) toward the radially central portion thereof, and the discharge sidescroll flow path 15, which is used to discharge the fluid from the central portion of the impeller 9 (blade portion 9 b) toward the outer circumference side thereof, communicate with each other via thecentral flow paths pump body 2 and theimpeller 9, thinning can be achieved even if a radial gap-type motor is used. Moreover, since the flow path loss leading from the suction sidescroll flow path 14 to the discharge sidescroll flow path 15 is small and the fluid passes in such a manner that these surround both end surface sides in the axial direction of thestator core 17 c, the heat generated by thecoil 17 d can be efficiently dissipated. - Next, an internal configuration of the
pump body 2 is described with reference toFIGS. 4A and 4B . -
FIG. 4A is a perspective view illustrating the oneend portion 2 a in the axial direction of thepump body 2, in which the suction sidescroll flow path 14 is formed. The fluid, which has entered from asuction hole 14 b provided on the outer circumference surface of thepump body 2, is guided toward a suction sidecentral hole 14 c while revolving in the circumferential direction. A suctionside scroll groove 14 a is partitioned by apartition wall 14 d, and is formed in a revolving shape in such a manner that the groove depth thereof becomes gradually shallower as the groove depth goes from thesuction hole 14 b toward the suction sidecentral hole 14 c (thelip portion 2 c: seeFIG. 3B ). - With this, the fluid, which has been suctioned into the
pump chamber 16 via thesuction hole 14 b, is guided toward the suction sidecentral hole 14 c while revolving along the suctionside scroll groove 14 a. At this time, since the groove depth becomes gradually shallower as the groove depth goes toward the suction sidecentral hole 14 c, the fluid is guided through thecentral flow path 10 b to thecentral flow path 10 a on the side of theimpeller 9 in the axial direction. While the fluid moves in a revolving manner in thepump body 2, the height of thepump chamber 16 is unnecessary, so that no loss occurs in the flow path even if thinning is achieved. -
FIG. 4B is a perspective view illustrating theother end portion 2 b in the axial direction of thepump body 2, in which the discharge sidescroll flow path 15 is formed. The fluid, which has entered from a discharge sidecentral hole 15 b through thecentral flow path 10 a, is guided to adischarge hole 15 c provided on the outer circumference surface of thepump body 2 while revolving in the circumferential direction along the blade portion 9 b of theimpeller 9. The dischargeside scroll groove 15 a is partitioned by apartition wall 15 d, and is formed in a revolving shape in such a manner that the groove depth thereof becomes gradually deeper as the groove depth goes from the discharge sidecentral hole 15 b toward thedischarge hole 15 c. - With this, the fluid, which has flowed from the
central flow path 10 a into the discharge sidecentral hole 15 b, is pressurized by rotation of the impeller 9 (the blade portion 9 b) and is guided toward the outer circumference surface of thepump body 2. More specifically, the pressurized fluid is conveyed while revolving along the dischargeside scroll groove 15 a, the groove depth of which becomes gradually deeper as the groove depth goes from the discharge sidecentral hole 15 b toward thedischarge hole 15 c, and is then discharged from thedischarge port 4. At this time, while the fluid moves in a revolving manner in thepump body 2, the height of thepump chamber 16 is unnecessary, so that no loss occurs in the flow path even if thinning is achieved. - It is desirable that, on the end surface in the axial direction of the
pump body 2, the suctionside scroll groove 14 a and the dischargeside scroll groove 15 a be formed in such a way as to be symmetric with respect to a point in such a manner that the flow velocity of the fluid flowing in these grooves becomes uniform. Specifically, as illustrated inFIGS. 2 and 3B , the suctionside scroll groove 14 a and the dischargeside scroll groove 15 a are formed in such a manner that a shallow groove and a deep groove are combined such that the groove bottom portions thereof are close to each other on the end surfaces in the axial direction of thepump body 2. - In this way, since the shallow groove and the deep groove are formed in combination on the end surfaces in the axial direction of the
pump body 2 in such a manner that the flow velocity of the fluid flowing in the suctionside scroll groove 14 a and the dischargeside scroll groove 15 a, which are formed by partitioning in the radial direction in thepump chamber 16, becomes uniform, there is no increase in the volume of thepump chamber 16 in the axial direction, thinning can be promoted, and the flow path loss leading from thesuction port 3 to thedischarge port 4 can reduced as much as possible, so that the pump performance can be maintained. - In
FIG. 1 , it is desirable thatannular seal members 18, 19 (for example, O rings) be provided between thepump body 2 and a pair ofbase portions pump body 2. With this, the sealing performance for fluid of the suction sidescroll flow path 14 and the discharge sidescroll flow path 15 can be enhanced. - Here, an example of a fluid conveying operation of the centrifugal pump 1 is described.
- In
FIG. 2 , when the electric motor is activated, theimpeller 9, which is integrally mounted to therotor shaft 7, is rotationally driven. - With this, the fluid is suctioned from the
suction port 3 through the suction sidescroll flow path 14, and the fluid suctioned from thesuction hole 14 b into thepump chamber 16 is guided to the suctionside scroll groove 14 a and is then conveyed toward the suction sidecentral hole 14 c while revolving (seeFIG. 4A ). - Then, the fluid is conveyed from the suction side
central hole 14 c to the discharge sidecentral hole 15 b through thecentral flow paths FIG. 3B ). The fluid, which has flowed from thecentral flow path 10 a into the discharge sidecentral hole 15 b, is guided toward the outer circumference surface of thepump body 2 while revolving along the dischargeside scroll groove 15 a by rotation of theimpeller 9, is pressurized toward thedischarge hole 15 c from the discharge sidecentral hole 15 b through the discharge sidescroll flow path 15, and is then discharged from the discharge port 4 (seeFIG. 4B ). - As described above, the centrifugal pump 1, in which thinning is achieved with use of a radial gap-type electric motor, the flow path loss leading from the suction side
scroll flow path 14 to the discharge sidescroll flow path 15 is small, and the heat generated by thecoil 17 d can be efficiently dissipated without inclusion of an extra cooling structure, can be provided. - In the above-described embodiment, the
impeller 9, which is mounted in a concentric manner around therotor shaft 7, includes theannular portion 9 a and the blade portion 9 b integrally molded with resin, but can be configured with separate components. - Moreover, while the
rotor shaft 8 is fixed and therotor 13 and theimpeller 9 are configured to be rotated, therotor 13 and theimpeller 9 can be configured to be rotated integrally with therotor shaft 7.
Claims (7)
1. A centrifugal pump that causes a radial gap-type electric motor to rotationally drive an impeller to suction a fluid from an outer circumference side of a pump body into a pump chamber and discharge the fluid from the pump chamber via the outer circumference side of the pump body, the centrifugal pump comprising:
a base portion;
a rotor shaft having at least one end prevented from dropping off and supported by the base portion in a standing manner;
the impeller rotatably attached to the rotor shaft;
a rotor including a rotor magnet mounted to the impeller in a concentric fashion; and
the pump body in which a suction side scroll flow path that suctions the fluid from an outer circumference side of the impeller toward a radially central portion thereof, a discharge side scroll flow path that discharges the fluid from the radially central portion of the impeller toward the outer circumference side thereof, and a stator including a stator core having stator pole teeth formed and placed to face radially the rotor magnet are integrally mounted,
wherein the rotor and the pump body are placed in a concentric fashion around the rotor shaft, and the suction side scroll flow path and the discharge side scroll flow path formed in the pump body communicate with each other via central flow paths formed in the pump body and the impeller.
2. The centrifugal pump according to claim 1 , wherein the suction side scroll flow path includes a suction hole provided on an outer circumference surface of the pump body and a suction side scroll groove partitioned in such a manner that the fluid entering from the suction hole is guided toward a suction side central hole while revolving in a circumferential direction and formed in such a manner that a groove depth thereof becomes shallower as the groove depth goes from the suction hole toward the suction side central hole.
3. The centrifugal pump according to claim 2 , wherein the suction side scroll flow path is formed between the suction side scroll groove formed on one end portion in an axial direction of the pump body and a base portion superposed on the one end portion in the axial direction.
4. The centrifugal pump according to claim 1 , wherein the discharge side scroll flow path includes a discharge side central hole formed in such a way as to communicate with the suction side central hole via the central flow paths and a discharge side scroll groove partitioned in such a manner that the fluid is guided from the discharge side central hole to a discharge hole provided on an outer circumference surface of the pump body while revolving and formed in such a manner that a groove depth thereof becomes deeper as the groove depth goes from the discharge side central hole toward the discharge hole.
5. The centrifugal pump according to claim 4 , wherein the discharge side scroll flow path is formed between the discharge side scroll groove formed on the other end portion in the axial direction of the pump body and a base portion superposed on the other end portion in the axial direction.
6. The centrifugal pump according to claim 1 , wherein, on end surfaces in the axial direction of the pump body, a shallow groove and a deep groove are placed while being combined such that groove bottom portions thereof are close to each other in such a manner that a flow velocity of the fluid becomes uniform in the suction side scroll flow path and the discharge side scroll flow path.
7. The centrifugal pump according to claim 1 , wherein the impeller includes an annular portion, to which the rotor is mounted, and a blade portion, which is mounted to the rotor shaft, the annular portion and the blade portion being molded integrally with each other.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017-030913 | 2017-02-22 | ||
JP2017030913A JP2018135805A (en) | 2017-02-22 | 2017-02-22 | Centrifugal Pump |
PCT/JP2017/044883 WO2018154931A1 (en) | 2017-02-22 | 2017-12-14 | Centrifugal pump |
Publications (1)
Publication Number | Publication Date |
---|---|
US20190368495A1 true US20190368495A1 (en) | 2019-12-05 |
Family
ID=63254329
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/098,070 Abandoned US20190368495A1 (en) | 2017-02-22 | 2017-12-14 | Centrifugal pump |
Country Status (5)
Country | Link |
---|---|
US (1) | US20190368495A1 (en) |
EP (1) | EP3438463A4 (en) |
JP (1) | JP2018135805A (en) |
CN (1) | CN109154309A (en) |
WO (1) | WO2018154931A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10718081B2 (en) * | 2016-06-13 | 2020-07-21 | Lg Electronics Inc. | Drain pump for laundry treating apparatus |
US10934992B2 (en) * | 2019-02-18 | 2021-03-02 | Toto Ltd. | Hydraulic generator, spouting apparatus, and method for manufacturing hydraulic generator |
CN113464452A (en) * | 2020-03-31 | 2021-10-01 | 建准电机工业股份有限公司 | Thin type pump |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
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CN109356856B (en) * | 2018-12-19 | 2020-05-19 | 华中科技大学 | Ultrathin centrifugal micropump |
CN110360125B (en) * | 2019-07-01 | 2024-06-14 | 深圳兴奇宏科技有限公司 | Thin pump structure |
TWI718766B (en) * | 2019-11-19 | 2021-02-11 | 建準電機工業股份有限公司 | Liquid cooling system and series-connected pump thereof |
TWI705194B (en) * | 2019-11-19 | 2020-09-21 | 建準電機工業股份有限公司 | Liquid cooling system and pump thereof |
TWI714437B (en) * | 2020-01-17 | 2020-12-21 | 建準電機工業股份有限公司 | Liquid-cooling heat dissipation system and pump |
TWI722832B (en) * | 2020-03-16 | 2021-03-21 | 建準電機工業股份有限公司 | Liquid cooling system and pump thereof |
CN112780605A (en) * | 2020-12-31 | 2021-05-11 | 东莞市鸿盈电子科技有限公司 | Novel impeller and micro water pump comprising same |
CN113738657B (en) * | 2021-11-03 | 2022-03-15 | 西安泵阀总厂有限公司 | Rare earth permanent magnet motor driven centrifugal pump and self-lubricating method |
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JP2000297775A (en) * | 1999-04-13 | 2000-10-24 | Matsushita Electric Ind Co Ltd | Self-priming type pump |
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JP2001132699A (en) | 1999-10-29 | 2001-05-18 | Matsushita Electric Ind Co Ltd | Micro-centrifugal pump and circulating system having this |
JP4213936B2 (en) * | 2002-10-08 | 2009-01-28 | 株式会社日立製作所 | Electronic equipment cooling device |
DE10251461A1 (en) * | 2002-11-05 | 2004-05-13 | BSH Bosch und Siemens Hausgeräte GmbH | Axial pump for domestic appliances, has an integrated electric motor rotor and impeller assembly drawing the liquid through a passage in the rotor |
JP4980804B2 (en) | 2007-06-29 | 2012-07-18 | ミネベア株式会社 | Thin electric pump |
JP5374206B2 (en) * | 2009-03-26 | 2013-12-25 | 三菱重工業株式会社 | Centrifugal fan and vehicle air conditioner |
JP5659208B2 (en) * | 2012-10-22 | 2015-01-28 | シナノケンシ株式会社 | Blower |
JP6381451B2 (en) * | 2015-01-17 | 2018-08-29 | 株式会社鷺宮製作所 | Centrifugal pump |
JP6247655B2 (en) * | 2015-03-25 | 2017-12-13 | シナノケンシ株式会社 | Manufacturing method of outer rotor type motor |
-
2017
- 2017-02-22 JP JP2017030913A patent/JP2018135805A/en not_active Withdrawn
- 2017-12-14 CN CN201780030807.1A patent/CN109154309A/en not_active Withdrawn
- 2017-12-14 WO PCT/JP2017/044883 patent/WO2018154931A1/en active Application Filing
- 2017-12-14 US US16/098,070 patent/US20190368495A1/en not_active Abandoned
- 2017-12-14 EP EP17898028.0A patent/EP3438463A4/en not_active Withdrawn
Patent Citations (2)
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JP2000297775A (en) * | 1999-04-13 | 2000-10-24 | Matsushita Electric Ind Co Ltd | Self-priming type pump |
US9388811B2 (en) * | 2009-06-23 | 2016-07-12 | Asia Vital Components Co., Ltd. | Micropump structure |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US10718081B2 (en) * | 2016-06-13 | 2020-07-21 | Lg Electronics Inc. | Drain pump for laundry treating apparatus |
US10934992B2 (en) * | 2019-02-18 | 2021-03-02 | Toto Ltd. | Hydraulic generator, spouting apparatus, and method for manufacturing hydraulic generator |
CN113464452A (en) * | 2020-03-31 | 2021-10-01 | 建准电机工业股份有限公司 | Thin type pump |
US11525447B2 (en) * | 2020-03-31 | 2022-12-13 | Sunonwealth Electric Machine Industry Co., Ltd. | Slim pump |
Also Published As
Publication number | Publication date |
---|---|
WO2018154931A1 (en) | 2018-08-30 |
EP3438463A1 (en) | 2019-02-06 |
CN109154309A (en) | 2019-01-04 |
EP3438463A4 (en) | 2019-06-05 |
JP2018135805A (en) | 2018-08-30 |
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