JP2004036532A - Electric pump - Google Patents

Electric pump Download PDF

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Publication number
JP2004036532A
JP2004036532A JP2002195986A JP2002195986A JP2004036532A JP 2004036532 A JP2004036532 A JP 2004036532A JP 2002195986 A JP2002195986 A JP 2002195986A JP 2002195986 A JP2002195986 A JP 2002195986A JP 2004036532 A JP2004036532 A JP 2004036532A
Authority
JP
Japan
Prior art keywords
impeller
shaft
rotor
stator
rotor core
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.)
Pending
Application number
JP2002195986A
Other languages
Japanese (ja)
Inventor
Eiji Kaneko
金子 栄次
Original Assignee
Toshiba Tec Corp
東芝テック株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Tec Corp, 東芝テック株式会社 filed Critical Toshiba Tec Corp
Priority to JP2002195986A priority Critical patent/JP2004036532A/en
Publication of JP2004036532A publication Critical patent/JP2004036532A/en
Application status is Pending legal-status Critical

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Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric pump capable of suppressing the rust of a rotor core. <P>SOLUTION: The electric pump is equipped with a stator 20 and a rotor 30. The rotor 30 has a metallic shaft 34, an ferrous rotor core assembly 31 fixed in an axial middle portion of the shaft 34, and a synthetic resinous impeller 35 formed with a liquid transporting groove portion 36 axially communicating on an outer peripheral portion. The rotor 30 is formed by covering the rotor core assembly 31 and near part thereof with the impeller 35 molded with the shaft 34. The rotor 30 is provided with a flow passage A in which liquid passes between the stator 20 and the impeller 35, and rotatably disposed in the stator 20. Annular recessed portions 38 are respectively provided on axial both end portions if the shaft 34 is in contact with the impeller 35. Projecting portion 37 of an inner peripheral portion of the impeller 35 are fitted in the recessed portions 38. Sealing is carried out at the recessed and projecting fitting portions. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electric pump that can be used as a water-cooled pump for transferring liquid, for example, cooling water for a water-cooled engine.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been known an electric pump in which a flow path is formed inside a motor in which a rotor is arranged in a stator, and the liquid flows through the flow path as the rotor rotates. The rotor provided in such an electric pump is a synthetic resin impeller in which a rotor and a rotor core assembly composed of a rotor core laminated on the magnet are fixed to a shaft, and an outer peripheral portion is provided with a groove communicating with an axial direction. It is formed by covering the rotor core assembly together with the shaft. Although the rotor core assembly is made of an iron-based material, the rotor core assembly is molded with an impeller so that the outer surface of the rotor core assembly does not rust by touching the liquid passing through the flow path.
[0003]
[Problems to be solved by the invention]
However, since a metal shaft penetrating the rotor core and a synthetic resin impeller have different coefficients of thermal expansion, there is a possibility that a gap may be formed in a contact portion between the shaft and the impeller depending on the temperature of the transfer liquid. If there is such a gap, a part of the transfer liquid may enter the inside of the impeller along the shaft, and eventually reach the iron-based rotor core assembly and rust the rotor core assembly, particularly the rotor core.
[0004]
Generally, the space between the rotor and the stator of the electric pump is extremely narrow. For this reason, if the rotor core rusts and the rotor expands in the radial direction, the rotor comes into contact with the stator and rotation failure easily occurs.
[0005]
An object of the present invention is to provide an electric pump that can suppress rust on a rotor core.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the electric pump according to the invention according to claim 1 includes a metal shaft to which an iron-based rotor core assembly is fixed, and a synthetic resin impeller molded to cover the rotor core assembly. At portions where the rotor core assembly contacts each other on both axial sides, an annular convex portion is provided on one of the shaft and the impeller, and an annular concave portion is provided on the other, and these convex portions and the concave portions are fitted together. I have.
[0007]
According to the present invention, a portion where the shaft comes into contact with the impeller may have the first seal surface intersecting with the axial direction of the shaft and the second seal surface which is connected to the surface so as to be bent and forms an annular shape around the axis. it can. Therefore, due to the difference in the coefficient of thermal expansion between the metal shaft and the synthetic resin impeller, the surface of the impeller that contacts the shaft is brought into close contact with either the first sealing surface or the second sealing surface, and A liquid seal with the impeller is created.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
[0009]
The electric pump 1 of this embodiment transfers, for example, a liquid having a temperature of about minus several tens degrees Celsius to about plus 100 degrees Celsius from one end in the axial direction to the other end.
[0010]
The electric pump 1 of this embodiment is formed by a brushless electric motor, and includes a pump casing 10 also serving as a motor case, a stator 20, a rotor 30, and a pair of bearings 40, as shown in FIG. .
[0011]
The pump casing 10 includes a cylindrical main frame 11, first and second sub-frames 12 and 13 connected to both ends of the main frame 11 in the axial direction by screws, and the like. The first and second end frames 14 and 15 which are overlapped in the thickness direction and connected by screws or the like are formed. The overlapping portion of the main frame 11 and the first sub-frame 12 and the overlapping portion of the second end frame 15 and the second sub-frame 13 are sealed by O-rings 16, respectively.
[0012]
The first sub-frame 12 and the first end frame 14 are provided with openings 12a, 14a penetrating in the thickness direction thereof and communicating with each other, thereby forming a liquid passage 17a. Similarly, the second sub-frame 13 and the second end frame 15 are provided with openings 13a and 15a penetrating in their thickness direction and communicating with each other, thereby forming a liquid passage 17b. .
[0013]
A bearing mounting portion 18 is formed at the center of each of the first and second sub-frames 12 and 13. A pair of sleeve-shaped sliding bearings 40 are mounted on the bearing mounting portions 18, respectively. Note that the rolling bearing 40 may be used as the bearing 40.
[0014]
A stator 20 is attached to the inner peripheral surface of the main frame 11 in close contact therewith. The stator 20 includes a stator core 21 formed by stacking a large number of core plates, a stator winding 22 which is wound around, for example, six T-shaped salient poles of the stator core 21, and a stator winding 22. And an electrically insulating synthetic resin portion 23 for embedding and molding. The stator windings 22 are connected in series in the radial direction of the stator 20 to form three sets of windings and are connected in three phases. The inner peripheral surface of the stator core 21 is covered with a thin layer 23a provided integrally with the synthetic resin portion 23 to prevent rust.
[0015]
A polyester resin or the like can be suitably used for the synthetic resin portion 23. An annular circuit board for relaying electricity to the stator windings 22 is embedded in one end (the upper end in FIG. 1) in the axial direction of the synthetic resin portion 23. A position sensor (not shown) such as a Hall element for detecting the rotational position of the rotor 30 is attached to this substrate, and a signal line and a cable such as an electric wire (see FIG. (Not shown) is connected. This cable is drawn out of the pump casing 10 through a space between the main frame 11 and the first sub-frame 12, for example, and is connected to a motor driver (not shown).
[0016]
As shown in FIG. 3, the rotor 30 includes a rotor core assembly 31, a shaft 34, and an impeller 35. The rotor core assembly 31 includes a rotor core 32 and a magnet 33, both ends of which are a pair of salient poles. The rotor core assembly 31 has a four-pole salient pole structure in which a pair of substantially I-shaped rotor cores 32 are overlapped in a cross shape between the rotor cores 32 via magnets 33 magnetized in the thickness direction (axial direction). Has become. The rotor core 32 is formed of a laminated steel plate, and the magnet 33 is a neodymium-iron-boron-based high energy product magnet.
[0017]
The shaft 34 rotatably supported by the bearing 40 at the protruding end portion 34a penetrates the center portions of the rotor core 32 and the magnet 33, respectively, and fixes the rotor core 32 and the magnet 33. The shaft 34 is made of metal, for example, SUS303 or the like. The impeller 35 is made of a synthetic resin, and can be formed of, for example, a polyester synthetic resin. The impeller 35 has a spiral groove 36 communicating with the outer periphery in the axial direction.
[0018]
The rotor 30 can be formed by putting the rotor core assembly 31 and its vicinity together with the shaft 34 into a synthetic resin and molding the same. At this time, both ends of the shaft 34 are not molded. The rotor 30 rotatably supports the protruding ends 34 a at both ends of the shaft 34 on a pair of bearings 40, and provides a flow path A through which liquid flows between the stator 20 and the impeller 35, It is arranged rotatably inside.
[0019]
As shown in FIGS. 3 to 5, one of the shaft 34 and the impeller 35, for example, the impeller 35, which is in contact with each other on both axial sides of the rotor core assembly 31, is provided with an annular convex portion 37. An annular concave portion 38 is provided on the other shaft 34, and the convex portion 37 and the concave portion 38 are fitted. The convex portion 37 is filled so as to fit into the concave portion 38 when the impeller 35 is molded. The protruding end 34 a of the shaft 34 protruding from the impeller 35 is formed to have a smaller diameter than the shaft portion in the impeller 35. The recess 38 and the protruding end 34a can be formed by cutting the shaft 34.
[0020]
In addition, while the annular convex portion 37 is provided on the shaft 34, the annular concave portion 38 is provided on the impeller 35, and the convex portion 37 and the concave portion 38 can be fitted to each other. The recess 38 that can be formed is preferable because it can be manufactured at low cost.
[0021]
The electric pump 1 having the above configuration is driven by energizing the stator 20 to transfer the liquid from one end in the axial direction to the other end. The energization of the stator 20 is performed by sequentially switching the excitation phase, and a rotating magnetic field that progresses in the circumferential direction of the stator 20 is generated. Accordingly, this magnetic field is magnetically coupled to each magnet 33 of the rotor 30. As a result, a rotational torque is generated between the stator 20 and the magnet 33, so that the rotor 30, both ends of which are supported by the bearing 40, is rotated with the impeller 35. The switching of the excitation phase can be reversed by the motor driver. Therefore, the rotor 30 is reversely rotated with the impeller 35.
[0022]
When the rotor 30 is rotated, the liquid is transferred in the groove 36 of the impeller 35 according to the rotation direction. Therefore, the liquid can be sucked in from one axial end of the electric pump 1 and discharged from the other end to be transferred. The transfer direction can be reversed by switching the excitation phase as described above.
[0023]
When the liquid is transferred by the electric pump 1, the rotor 30 is exposed to the liquid. According to the rotor 30 provided in the electric pump 1, it is possible to suppress the liquid from entering the inside.
[0024]
This is achieved by providing annular convex portions 37 at both axial ends of the impeller 35 that come into contact with the shaft 34 and providing annular concave portions 38 at both axial ends of the shaft 34 that come into contact with the impeller 35. This is because the and the recess 38 are fitted. As a result, the portion where the shaft 34 contacts the impeller 35 is connected to a surface intersecting the axial direction, for example, a first sealing surface 34t orthogonal to the axial direction of the shaft 34, and is connected to the first sealing surface 34t so as to be bent from the first sealing surface 34t. , For example, a second seal surface 34s that is annular in parallel with the axial direction. Therefore, due to the difference in the coefficient of thermal expansion between the metal shaft 34 and the synthetic resin impeller 35, the surface of the impeller 35 that is in contact with the shaft 34 is either the first sealing surface 34t or the second sealing surface 34s. The liquid is sealed between the shaft 34 and the impeller 35 by making close contact with each other, so that the liquid can be prevented from entering the inside.
[0025]
That is, at low temperatures, the impeller 35 made of synthetic resin has a larger coefficient of thermal expansion in the direction orthogonal to the axial direction than the shaft 34 made of SUS303. Therefore, the inner surface 35s parallel to the axial direction of the impeller 35 expands as indicated by a broken line in FIG. Actually, since the shaft 34 is provided inside the impeller 35, the inner surface 35s of the impeller 35 parallel to the axial direction of the shaft 34 is strongly pressed against the second sealing surface 34s parallel to the axial direction of the shaft 34. It is applied and adheres. Thereby, the liquid is sealed between the impeller 35 and the shaft 34, and the liquid is prevented from entering the inside of the impeller 35.
[0026]
At a low temperature, the impeller 35 made of synthetic resin has a smaller coefficient of thermal expansion in a direction parallel to the axial direction than the shaft 34 made of SUS303, so that it is orthogonal to the axial direction of the impeller 35. a gap g 1 between the first sealing surface 34t perpendicular to the axial direction of the inner surface 35t and the shaft 34. However, as described above, since the inner surface 35s is in close contact with the second seal surface 34s and the space between the impeller 35 and the shaft 34 is sealed, it is possible to suppress the liquid from entering the inside of the rotor 30.
[0027]
On the other hand, at high temperatures, the impeller 35 made of synthetic resin has a larger coefficient of thermal expansion in the direction parallel to the axial direction than the shaft 34 made of SUS303. Therefore, the inner surface 35t of the impeller 35 orthogonal to the axial direction of the shaft 34 expands as indicated by a broken line in FIG. Actually, since the shaft 34 is provided inside the impeller 35, the inner surface 35 t orthogonal to the axial direction of the impeller 35 is strongly pressed against the first seal surface 34 t orthogonal to the axial direction of the shaft 34 to be in close contact therewith. I do. Thereby, the liquid is sealed between the impeller 35 and the shaft 34, and the liquid is prevented from entering the inside of the impeller 35.
[0028]
At high temperatures, the impeller 35 made of synthetic resin has a smaller coefficient of thermal expansion in the direction orthogonal to the axial direction than the shaft 34 made of SUS303, so that it is parallel to the axial direction of the impeller 35. a gap g 2 between the second sealing surface 34s parallel to the axial direction of such inner surface 35s and the shaft 34. However, as described above, since the inner surface 35t and the first sealing surface 34t are in close contact with each other to seal the space between the impeller 35 and the shaft 34, it is possible to suppress the liquid from entering the inside of the rotor 30.
[0029]
As described above, according to the electric pump 1, among the shaft 34 and the impeller 35 that are in contact with each other on both axial sides of the rotor core assembly 31, one of the impellers 35 is provided with the annular convex portion 37 and the other of the shafts 34. An annular concave portion 38 is provided on the shaft, and the convex portion 37 and the concave portion 38 are fitted to each other, so that the shaft 34 and the impeller 35 are brought into close contact with each other regardless of whether the temperature is low or high. In the impeller 35 can be suppressed. Thereby, rust of the rotor core 32 induced by the liquid entering the inside of the impeller 35 is suppressed. Accordingly, it is possible to suppress a rotation failure due to the contact between the rotor 30 and the stator 20, which is caused by the rust of the rotor core 32 and the expansion of the rotor 30 in the radial direction.
[0030]
In the electric pump 1 of this embodiment, the shaft 34 has not only the second seal surface 34s parallel to the axial direction but also the first seal surface 34t orthogonal to the axial direction. This is more effective at high temperatures where the coefficient of thermal expansion in the direction parallel to the axial direction is large.
[0031]
Further, in the electric pump 1, since the sealing is performed by utilizing the difference in thermal expansion between the synthetic resin and the iron-based material such as stainless steel, the annular convex portion 37 formed on the impeller 35 and the shaft 34 are formed. The rust of the rotor core 32 can be suppressed with a simple configuration in which the annular concave portion 38 formed in the above is fitted.
[0032]
Further, in this electric pump, the concave portion 38 is provided on the shaft 34, and the convex portion 37 is provided on the impeller 35, and the protruding end portion 34 a of the shaft 34 protruding from the impeller 35 is connected to the shaft portion in the impeller 35. Since the diameter is smaller, the concave portion 38 and the protruding end portion 34a can be formed by cutting the shaft 34. Therefore, the material cost of the shaft 34 is low. Moreover, since the diameter of the protruding end portion 34a is smaller than that of the shaft portion in the impeller 35, the diameter of the bearing 40 is reduced, and the area around the entrance of the flow path A is not narrowed, so that the liquid can be smoothly transferred.
[0033]
Hereinafter, a second embodiment of the present invention will be described with reference to FIG. In the electric pump 1 of this embodiment, an annular convex portion 37 is formed on the shaft 34 of the shaft 34 formed of an iron-based material such as SUS303 and an impeller 35 made of synthetic resin, which are in contact with each other on both axial sides of the rotor core assembly 31. At the same time, an annular concave portion 38 is provided in the impeller 35, and the convex portion 37 and the concave portion 38 are fitted. As a result, a surface intersecting with the axial direction, for example, a first seal surface 34t orthogonal to the axial direction of the shaft 34, and a portion where the shaft 34 contacts the impeller 35, are connected so that the first seal surface 34t is bent. An annular second seal surface 34s can be provided in parallel with the axial direction. The other configuration is the same as that of the above-described first embodiment, and the same description will be omitted by attaching the same reference numerals to FIG. 6.
[0034]
In this electric pump 1, the surface of the impeller 35 that comes into contact with the shaft 34 is changed to the first sealing surface 34t or the second sealing surface 34s due to the difference in the coefficient of thermal expansion between the metal shaft 34 and the synthetic resin impeller 35. A liquid seal is provided between the shaft 34 and the impeller 35 in close contact with any one of the shafts, and it is possible to prevent liquid from entering the inside.
[0035]
That is, at low temperatures, the impeller 35 made of synthetic resin has a larger coefficient of thermal expansion in the direction orthogonal to the axial direction than the shaft 34 made of SUS303. Therefore, the inner surface 35s of the impeller 35 parallel to the axial direction of the shaft 34 expands as shown by a broken line in FIG. Actually, since the shaft 34 is provided inside the impeller 35, the inner surface 35 s parallel to the axial direction of the impeller 35 is strongly pressed against the second seal surface 34 s parallel to the axial direction of the shaft 34, so that the inner surface 35 s is closely contacted. I do. Thereby, the liquid is sealed between the impeller 35 and the shaft 34, and the liquid is prevented from entering the inside of the impeller 35.
[0036]
At a low temperature, the impeller 35 made of synthetic resin has a smaller coefficient of thermal expansion in a direction parallel to the axial direction than the shaft 34 made of SUS303, so that it is orthogonal to the axial direction of the impeller 35. a gap g 1 between the first sealing surface 34t perpendicular to the axial direction of the inner surface 35t and the shaft 34. However, as described above, since the inner surface 35s is in close contact with the second seal surface 34s and the space between the impeller 35 and the shaft 34 is sealed, it is possible to suppress the liquid from entering the inside of the rotor 30.
[0037]
On the other hand, at high temperatures, the impeller 35 made of synthetic resin has a larger coefficient of thermal expansion in the direction parallel to the axial direction than the shaft 34 made of SUS303. Therefore, the inner surface 35t orthogonal to the axial direction of the impeller 35 expands as indicated by a broken line in FIG. Actually, since the shaft 34 is provided inside the impeller 35, the inner surface 35t of the impeller 35 orthogonal to the axial direction of the shaft 34 is strongly pressed against the first sealing surface 34t orthogonal to the axial direction of the shaft 34. Be closely attached. Thereby, the liquid is sealed between the impeller 35 and the shaft 34, and the liquid is prevented from entering the inside of the impeller 35.
[0038]
At high temperatures, the impeller 35 made of synthetic resin has a smaller coefficient of thermal expansion in the direction perpendicular to the axial direction than the shaft 34 formed of SUS303, a gap g 2 between the second sealing surface 34s parallel to the axial direction of such inner surface 35s and the shaft 34. However, as described above, since the inner surface 35t and the first sealing surface 34t are in close contact with each other to seal the space between the impeller 35 and the shaft 34, it is possible to suppress the liquid from entering the inside of the rotor 30.
[0039]
Thus, according to the electric pump 1 of the second embodiment, the same effects as those of the first embodiment can be obtained.
[0040]
In the first and second embodiments, one annular convex portion 37 and one annular concave portion 38 are provided at both axial end portions of the impeller 35 in contact with the shaft 34. However, the annular convex portion 37 and the annular concave portion 38 are provided. Not only one concave portion 38 but also a plurality of concave portions 38 may be provided.
[0041]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the electric pump which can suppress that a rotor core rusts is obtained.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an electric pump according to a first embodiment of the present invention.
FIG. 2 is a perspective view showing a rotor of the electric pump shown in FIG. 1;
FIG. 3 is a perspective view showing a part of the rotor of the electric pump shown in FIG. 1 cut away;
FIG. 4 is a sectional view showing a rotor of the electric pump of FIG. 1;
FIG. 5A is a sectional view showing a part of a rotor at a low temperature. (B) is a sectional view showing a part of the rotor at a high temperature.
FIG. 6A is a cross-sectional view illustrating a part of a rotor at a low temperature of an electric pump according to a second embodiment of the present invention. FIG. 7B is a cross-sectional view showing a part of the rotor of the electric pump in FIG. 6A at a high temperature.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Electric pump 20 ... Stator 30 ... Rotor 31 ... Rotor core assembly 34 ... Shaft 34a ... Protruding end part 35 ... Impeller 36 ... Groove part 37 ... Convex part 38 ... Concave part A ... Channel

Claims (2)

  1. A stator,
    A metal shaft, an iron-based rotor core assembly fixed to an intermediate portion in the axial direction of the shaft, and a synthesis molded over the rotor core assembly and formed with a liquid transfer groove communicating with the outer periphery in the axial direction. Having a resin impeller, providing a flow path through which liquid flows between the stator and the impeller, and a rotor rotatably disposed in the stator,
    An annular convex portion is provided on one of the shaft and the impeller, which are in contact with each other on both axial sides of the rotor core assembly, and an annular concave portion is provided on the other, and these convex portions and concave portions are fitted. Electric pump.
  2. The said recess is provided in the said shaft, The said convex part is provided in the said impeller, The projection end part of the said shaft projected from the said impeller made the diameter smaller than the shaft part in the said impeller. The described electric pump.
JP2002195986A 2002-07-04 2002-07-04 Electric pump Pending JP2004036532A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002195986A JP2004036532A (en) 2002-07-04 2002-07-04 Electric pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002195986A JP2004036532A (en) 2002-07-04 2002-07-04 Electric pump

Publications (1)

Publication Number Publication Date
JP2004036532A true JP2004036532A (en) 2004-02-05

Family

ID=31704218

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2002195986A Pending JP2004036532A (en) 2002-07-04 2002-07-04 Electric pump

Country Status (1)

Country Link
JP (1) JP2004036532A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005282371A (en) * 2004-03-26 2005-10-13 Minebea Co Ltd Electric pump
JP2009511802A (en) * 2005-10-05 2009-03-19 ハートウェア、インコーポレイテッド Axial pump with multi-groove rotor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005282371A (en) * 2004-03-26 2005-10-13 Minebea Co Ltd Electric pump
JP4565870B2 (en) * 2004-03-26 2010-10-20 ミネベア株式会社 Electric pump
US7896626B2 (en) 2004-03-26 2011-03-01 Minebea Co., Ltd. Electric pump
JP2009511802A (en) * 2005-10-05 2009-03-19 ハートウェア、インコーポレイテッド Axial pump with multi-groove rotor

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