CN210371198U - Centrifugal pump for household appliances - Google Patents

Centrifugal pump for household appliances Download PDF

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Publication number
CN210371198U
CN210371198U CN201920948679.5U CN201920948679U CN210371198U CN 210371198 U CN210371198 U CN 210371198U CN 201920948679 U CN201920948679 U CN 201920948679U CN 210371198 U CN210371198 U CN 210371198U
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CN
China
Prior art keywords
centrifugal pump
stator
household appliances
section
pump suitable
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CN201920948679.5U
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Chinese (zh)
Inventor
R·奥鲁·奥鲁
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Copreci SCL
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Copreci SCL
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps
    • F04D13/064—Details of the magnetic circuit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
    • H02K1/148—Sectional cores
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/278—Surface mounted magnets; Inset magnets
    • 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
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H02K5/128—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas using air-gap sleeves or air-gap discs

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

The utility model relates to a centrifugal pump for domestic appliance. The centrifugal pump comprises an electric motor comprising a permanent magnet rotor and a stator, the stator comprising a plurality of salient poles, each pole comprising a first rectangular prismatic or quadrangular prismatic section attached to the stator and a second section elongated from the first rectangular prismatic or quadrangular prismatic section towards the rotor and widening towards the sides, each pole comprising a respective hollow reel with a respective coil, each reel comprising an upper base, a lower base and a connecting core joining both the upper and lower bases, the corresponding pole passing through the connecting core. The connecting core comprises a first rectangular prismatic or quadrangular prismatic portion in which the first rectangular prismatic or quadrangular prismatic section of the corresponding pole is housed and a second truncated-cone-shaped portion in which at least a portion of the second section of the pole is housed.

Description

Centrifugal pump for household appliances
Technical Field
The present invention relates to a centrifugal pump for a household appliance, in particular a dishwasher, washing machine, dryer or oven.
Background
Centrifugal pumps for household appliances are known, comprising a permanent magnet motor having a fixed stator, a rotor integral with a drive shaft, and an impeller coupled to the rotor by the drive shaft. The stator generally includes two or more salient poles on which a winding shaft formed of a non-conductive material is disposed, on which a coil is wound.
In this sense, for example, ES1067534U discloses a drain pump which is adapted to be fixed to a hydraulic drain body of a household appliance and which comprises an electric motor. The motor includes a permanent magnet rotor and a stator, the stator including a plurality of salient poles. Each pole comprises a first rectangular parallelepiped or quadrangular prism-shaped portion attached to the stator and a second portion elongated from said first portion towards the rotor and widened towards the sides, each pole comprising a respective hollow reel with a respective coil. Each reel includes an upper base, a lower base, and a connection core joining both the upper and lower bases, through which the corresponding pole passes.
SUMMERY OF THE UTILITY MODEL
The object of the present invention is to provide a centrifugal pump for a household appliance, in particular a dishwasher, washing machine, dryer or oven.
The centrifugal pump according to the invention, which is suitable for use in a household appliance, comprises an electric motor. The motor includes a permanent magnet rotor and a stator including a plurality of salient poles. Each pole comprises a first rectangular prismatic or quadrangular prismatic section attached to the stator and a second section elongated from the first section towards the rotor and widening towards the sides, each pole comprising a respective hollow reel with a respective coil. Each reel includes an upper base, a lower base, and a connection core joining both the upper and lower bases, through which the corresponding pole passes.
The connecting core of the centrifugal pump of the present invention comprises a first rectangular prismatic or quadrangular prismatic portion in which the first rectangular prismatic or quadrangular prismatic section of the corresponding pole is housed and a second truncated cone-shaped portion in which at least a part of said second section of said pole is housed.
With the centrifugal pump of the present invention, the area or space of the reel in which the coil is housed is enlarged, because the second truncated-cone-shaped portion of the reel allows the reel to conform to the profile of the second section widening towards the side of the corresponding pole, without colliding with said pole, so that the gap between the upper and lower seats of the reel can be increased, thus enlarging the space intended to house the coil. This construction allows reducing costs in a simple manner and also reducing the weight of the centrifugal pump without sacrificing the performance of the motor, since on the one hand it allows using a coil material (such as aluminium or derivatives thereof) which is less dense and therefore lighter in weight, but which on the contrary occupies a larger volume, even further contributes to reducing the weight of the centrifugal pump, and on the other hand it enables reducing the dimensions of the stator and its poles, reducing the costs required for this, without sacrificing the space desired for the coils to be housed in the reels.
Likewise, it is also possible to increase the power of the motor without compromising the original size of the motor, since in this case, for example, the area of the reel would be sufficient to increase the stator field using a more dense and more conductive material such as copper.
These and other features and advantages of the present invention will become apparent from the drawings and detailed description of the invention.
Drawings
Fig. 1 is a front view of a centrifugal pump according to the present invention.
Fig. 2 is a sectional view of the centrifugal pump of fig. 1.
Fig. 3 is another sectional view of the centrifugal pump of fig. 1.
Fig. 4 is a perspective view of the spool of the centrifugal pump of fig. 1.
Fig. 5 is another perspective view of the spool of the centrifugal pump of fig. 1.
Fig. 6 is a perspective view of an arrangement of a rotor and a stator with poles, wherein only the reels in one pole are depicted, and the coils are not depicted.
Detailed Description
Fig. 1 and 2 show an embodiment of a centrifugal pump 1 according to the invention. The centrifugal pump 1 comprises an electric motor 2, preferably a synchronous permanent magnet motor, the electric motor 2 comprising a rotor 3 and a fixed stator 4, the stator 4 comprising a plurality of salient poles 4b exposed towards the rotor 3. The rotor 3 is integral with a drive shaft 11, the drive shaft 11 actuating the impeller 9 coupled with the rotor 3 through said drive shaft 11, as can be seen in fig. 2.
Each pole 4b comprises a first rectangular prismatic or quadrangular prismatic section 4 b' removably attached to the stator 4, and a second section 4b ", from which the second section 4 b" is elongated towards the rotor 3 and widened towards the sides, said second section 4b "comprising a lower arc-shaped surface conforming to the outer contour of a portion of the rotor 3, as observed for example in fig. 3.
Each pole 4b comprises a respective hollow reel 6 with a respective coil 8. As shown in fig. 4, each reel 6 of the present invention includes an upper base 6a, a lower base 6b, and a connection core 5 joining both the upper base 6a and the lower base 6b, and the corresponding pole 4b passes through the connection core 5.
The connecting core 5 of the centrifugal pump of the present invention comprises a first rectangular or quadrangular prismatic portion 5a in which the first section 4 b' of the corresponding pole 4b is housed and a second truncated-cone-shaped portion 5b in which at least a portion of the second section 4b "of said pole 4b is housed.
In a preferred embodiment of the invention, the motor 2 is a three-phase BLDC type, i.e. a brushless dc motor, although the type of motor used is not essential to the invention.
With the centrifugal pump 1 of the present invention, the area or space of the reel 6 in which the coil 8 is housed is enlarged, because the second truncated-cone-shaped portion 5b of the reel 6 allows the reel 6 to conform to the profile of the second section 4b ", widened towards the side of the corresponding pole 4b, without colliding with said pole 4b, so that the gap between the upper seat 6a and the lower seat 6b of the reel 6 can be increased, thus enlarging the space intended to house the coil 8. This configuration allows reducing costs and also reducing the weight of the centrifugal pump 1 in a simple manner, without sacrificing the performance of the motor 2.
One option for reducing costs and at the same time helping to reduce the weight of the centrifugal pump 1 may be to vary the size of the rotor 3 and/or the stator 4. In this sense, for example, if the size of the stator 4 and its poles 4b is reduced, the space in the reel 6 for accommodating the coil 8 will also increase laterally, since a narrower connecting core 5 will be required. This increase in the space of the reel 6 intended to accommodate the coil 8 allows the use of a less dense coil material 8, which in turn occupies a larger volume, even further contributing to a reduction in the weight of the centrifugal pump 1. In this sense, for example, for the same number of turns, the space required for the coil 8 made of copper-clad aluminum wire (commonly referred to as CCA wire) is greater than the space required for the coil 8 made of copper only, if the joule loss is intended to be kept at the same level. The centrifugal pump 1 of the present invention therefore allows modifying the material of the coil 8 without any problem, since there are no physical space restrictions.
Furthermore, it is also possible to increase the power of the motor 2 without compromising the original size of the motor 2, since the area of the reel 6 will be sufficient for increasing the generated stator magnetic field, even without the need to change material.
In a non-limiting example, the width of the first section 4 b' of the pole 4b is less than 7mm, preferably equal to or less than 6 mm. In these cases, the height of the first rectangular prismatic or quadrangular prismatic section 4 b' of the pole 4b is reduced, since it is necessary to maintain a minimum thickness on the side of the second section 4b ″ of the pole 4b in order to keep the reluctance at an acceptable level, and therefore, by using the reel of the prior art, in which the connecting core is formed only by the first rectangular prismatic or quadrangular prismatic portion that must be in contact with the first section of the corresponding pole, the distance between the upper and lower seats of the reel will be reduced, and therefore the volume of conductive material of the corresponding coil (with consequent maximum stator magnetic field capacity) will be negatively affected.
Thus, in those cases where space is of the utmost importance and therefore the pole 4b cannot be extended in order to extract the first segment 4 b' of the corresponding pole 4b, the reel 6 of the present invention allows the size of the stator 4 to be reduced without compromising the space intended to contact the coil 8.
The motor 2 of the preferred embodiment of the present invention comprises a hexagonal outer frame circumscribing three equidistant poles 4b so that they emerge from the frame towards the rotor 3, as can be observed in fig. 3 or 6, the motor 2 occupying the maximum volume defined by the diameter corresponding to the circle circumscribing the stator 4. However, the number of poles 4b of the stator 4 is not limited to the present invention.
As shown in fig. 3 and 6, the upper base 6a of the reel 6 of the present invention is in contact with the inner face of the frame of the stator 4 for the purpose of improving heat transfer from the conductive material of the coil 8 to the stator 4.
On each pole 4b, a respective reel 6 is arranged so that said pole 4b passes through the reel 6, wherein a first section 4b 'of the pole 4b is housed in a first portion 5a of the connection core 5 and at least a portion of a second section 4b "of the pole 4b is housed in a second portion 5b of the connection core 5, so that the first section 4 b' of the pole 4b is in contact with the first portion 5a of the connection core 5 of the reel 6, and the lateral inner face of the second truncated-cone-shaped portion 5b of the connection core 5 is in partial contact with the second section 4 b" of the corresponding pole 4b housed in said second portion 5b, as can be observed in fig. 3 or 6.
The second truncated-cone-shaped portion 5b of the connection core 5 comprises, on the front and/or rear inner face, a plurality of reinforcing ribs 5c which, on the one hand, reinforce said second truncated-cone-shaped portion 5b and, on the other hand, enable said front and/or rear inner face of the connection core 5 to come into contact with the second section 4b "(as shown in figures 5 and 6), thus facilitating the transfer of the heat generated in the coil 8 by conduction.
Each reel 6 according to the preferred embodiment of the invention is formed by a single part assembled on the pole 4b of the corresponding stator 4. Alternatively, each of the spools 6 may be overmolded onto the stator 4 and its respective pole 4 b.
On each reel 6a coil 8 is wound, the coil 8 being electrically connected to a printed circuit board 12, preferably a PCB, said coil 8 being arranged in a space delimited by the upper and lower bases 6a, 6b and the connecting core 5.
In a preferred embodiment of the invention, the electric motor 2 is housed inside a casing 7, while the impeller 9 is arranged outside said casing 7, as shown in fig. 1 and 2.
In a preferred embodiment of the invention, said casing 7 comprises fins 10, the fins 10 being arranged at the level of the stator 4 and in contact with at least a portion of said stator 4, as can be seen in fig. 3. Thereby, it is substantially facilitated to dissipate the heat generated by the motor 2 outside the centrifugal pump 1.
Alternatively, instead of fins 10, said casing 7 may comprise a contact wall (not shown in the figures) arranged at the level of the stator 4, surrounding and contacting the majority of the outer wall of the stator 4, wherein the contact wall may contact more than 80% of the outer area of the stator 4, which, as such, substantially facilitates the dissipation of the heat generated by the motor 2 outside the centrifugal pump 1.
As shown in fig. 2, the upper base 6a of the reel 6 of the present invention is also in contact with the casing 7, thereby contributing even further to the dissipation of heat generated by the motor 2 out of the centrifugal pump 1.
To facilitate assembly of the centrifugal pump 1 of the present invention, the housing 7 is divided into two parts consisting of a first member 7b and a second member 7c, such that the housing 7 is formed when these two parts are connected together. However, the housing 7 may alternatively be integrated in a single component.
The housing 7 of the present invention is generally cylindrical and provides additional safety to the motor 2 because it includes anti-drift protection to prevent water from entering the housing and to prevent the user from making indirect contact with the motor 2 and the printed circuit board 12.
In a preferred embodiment of the invention, the centrifugal pump 1 comprises a substantially cylindrical body 14, the rotor 3 and the stator 4 being arranged on the body 14, as shown in fig. 2.
The housing 7 is detachably attached to the main body 14, for example, using a clip-type attachment means. The housing 7 also comprises a cable duct 15 for guiding the wiring of the electric motor 2.
The centrifugal pump 1 of the present invention is suitable for any configuration of hydraulic displacement body (the centrifugal pump 1 is inserted into the hydraulic displacement body) so that it can use the same motor 2 for different configurations of hydraulic displacement body by changing the casing 7.
As discussed, the rotor 3 according to a preferred embodiment of the present invention is a permanent magnet rotor, wherein the magnets are preferably made of anisotropic barium or strontium ferrite, although other materials are also possible, such as for example rare earth based alloys such as for example neodymium (Nd).
Furthermore, the stator 4 of the present invention is ferromagnetic and the coil 8 of the reel 6 may be formed by an enameled copper wire, an aluminum wire or any combination of the two.

Claims (15)

1. A centrifugal pump suitable for household appliances, comprising an electric motor (2), said electric motor (2) comprising a permanent magnet rotor (3) and a stator (4), said stator (4) comprising a plurality of salient poles (4b), each salient pole (4b) comprising a first rectangular prismatic or quadrangular prismatic section (4b ') attached to said stator (4) and a second section (4b "), said second section (4 b") being elongated from said first rectangular prismatic or quadrangular prismatic section (4 b') towards said permanent magnet rotor (3) and widening towards the sides, each salient pole (4b) comprising a respective hollow reel (6) with a respective coil (8), each reel (6) comprising an upper base (6a), a lower base (6b) and a connecting core (5) joining both said upper base (6a) and said lower base (6b), the corresponding salient poles (4b) pass through the connecting core (5), characterized in that the connecting core (5) comprises a first rectangular prismatic or quadrangular prismatic portion (5a) in which the first rectangular prismatic or quadrangular prismatic section (4 b') of the corresponding salient pole (4b) is housed and a second truncated cone-shaped portion (5b) in which at least a portion of the second section (4b ") of the salient pole (4b) is housed.
2. Centrifugal pump suitable for household appliances according to claim 1, characterized in that the inner lateral surface of the second truncated-cone-shaped portion (5b) of the connecting core (5) is in contact with the at least a portion of the second section (4b ") of the corresponding salient pole (4b) housed in the second truncated-cone-shaped portion (5 b).
3. Centrifugal pump suitable for household appliances according to claim 1 or 2, characterized in that the second truncated-cone-shaped portion (5b) of the connecting core (5) comprises a plurality of reinforcing ribs (5c) on the front and/or rear inner face.
4. A centrifugal pump suitable for household appliances according to claim 3, characterized in that the reinforcing ribs (5c) are in contact with the second sections (4b ") of the corresponding salient poles (4 b).
5. Centrifugal pump suitable for household appliances according to claim 1 or 2, characterized in that the first rectangular prismatic or quadrangular prismatic section (4 b') of the salient poles (4b) is in contact with the first rectangular prismatic or quadrangular prismatic portion (5a) of the connection core (5) of the reel (6).
6. Centrifugal pump suitable for household appliances according to claim 1 or 2, characterized in that the width of the first rectangular or quadrangular cylindrical section (4 b') of the salient poles (4b) is less than 7 mm.
7. A centrifugal pump suitable for household appliances according to claim 1 or 2, characterized in that the motor (2) comprises three salient poles (4b), the stator (4) comprising a hexagonal frame circumscribing the salient poles (4 b).
8. Centrifugal pump suitable for household appliances according to claim 1 or 2, characterized in that the electric motor (2) is housed inside a casing (7), the casing (7) comprising fins (10), the fins (10) being arranged at the level of the stator (4) and being in contact with at least a portion of the stator (4).
9. Centrifugal pump suitable for household appliances according to claim 1 or 2, characterized in that the electric motor (2) is housed inside a casing (7), the casing (7) comprising a contact wall at the level of the stator (4) surrounding and contacting most of the outer wall of the stator (4).
10. Centrifugal pump suitable for household appliances according to claim 8, characterized in that the upper base (6a) of each reel (6) is in contact with the casing (7).
11. Centrifugal pump suitable for household appliances according to claim 9, characterized in that the casing (7) comprises a first member (7b) and a second member (7c) attached together forming the casing (7).
12. Centrifugal pump suitable for household appliances according to claim 1 or 2, characterized in that each reel (6) is formed by a single part assembled on the respective salient pole (4b) of the stator (4) or overmoulded onto the stator (4) and the respective salient pole (4b) of the stator (4).
13. Centrifugal pump suitable for household appliances according to claim 1 or 2, characterized in that the permanent magnet rotor (3) comprises permanent magnets made of strontium ferrite or rare earth based alloys.
14. Centrifugal pump suitable for household appliances according to claim 1 or 2, characterized in that the stator (4) is ferromagnetic.
15. Centrifugal pump suitable for household appliances according to claim 1 or 2, characterized in that the coil (8) is formed by an enameled copper wire or aluminum wire or a combination of both.
CN201920948679.5U 2018-06-22 2019-06-21 Centrifugal pump for household appliances Active CN210371198U (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES201830974U ES1216580Y (en) 2018-06-22 2018-06-22 Centrifugal pump for an appliance
ESU201830974 2018-06-22

Publications (1)

Publication Number Publication Date
CN210371198U true CN210371198U (en) 2020-04-21

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Application Number Title Priority Date Filing Date
CN201920948679.5U Active CN210371198U (en) 2018-06-22 2019-06-21 Centrifugal pump for household appliances

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CN (1) CN210371198U (en)
DE (1) DE202019103402U1 (en)
ES (1) ES1216580Y (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021132720A1 (en) 2021-09-24 2023-03-30 Hanning Elektro-Werke Gmbh & Co. Kg BLDC motor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES1067534Y (en) 2008-03-17 2008-08-16 Coprecitec Sl EMPTYING PUMP ADAPTABLE TO AN ELECTRICAL APPLIANCE

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Publication number Publication date
ES1216580U (en) 2018-08-13
DE202019103402U1 (en) 2019-06-27
ES1216580Y (en) 2018-11-07

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