JP2004308562A - Motor pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize rotation of a rotor, reduce vibration noise, and improve pumping efficiency, in an outer rotor type motor constitution. <P>SOLUTION: A stator 3 constituted by winding a coil 14 around a core 13 is disposed in a casing 2. A shaft 16 is disposed at a center of the stator 3, and the rotor 4 can be rotated around an outer periphery of the stator 3. The shaft 16 functions as the center of the rotation of the rotor 4. Impellers 5 can be rotated integrally with the rotor 3. Along with rotation of the impeller 5, liquid sucked from an suction port 9 into a pump chamber 11 is discharged from a discharge port 10 to the outside. The shaft 16 passing through the stator 3 is fixed to the member 3. A tip part 16b of the shaft 16 rotatably supports the rotor 4. A lower plate 8 supports a base end part 16a of the shaft 16 thereon. The stator 3 and the casing 2 are made of resin and integrally molded. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pump used for, for example, a water pump of a water-cooled cooling device, and more particularly to a motor pump in which an outer rotor type motor and a pump are integrally provided in a casing.
[0002]
[Prior art]
Conventionally, as this type of motor pump, for example, there is a pump described in Patent Document 1 below. As shown in FIG. 9, a so-called outer rotor type motor 101 is employed for the pump 100. Generally, an outer rotor type motor can be downsized in spite of a large discharge amount. The motor 101 includes a stator 102 of a mold type and a rotor 103 arranged on the outer periphery of the stator 102. The rotor 103 is obtained by molding a rotor core 105 on which a permanent magnet 104 is mounted with resin. The rotor 103 is formed in a cylindrical shape with a bottom, and a shaft 106 is fixed to the center thereof. The shaft 106 is disposed in a center hole 108 formed in the molded stator 107, and upper and lower ends thereof are rotatably supported by the casing cover 109 and the molded stator 107, respectively. An impeller 111 is constituted by a plurality of vanes 110 protruding from the outer periphery of the rotor 103.
[0003]
[Patent Document 1]
JP-A-11-166500 (page 7, FIG. 23)
[0004]
[Problems to be solved by the invention]
However, in the pump 100 described in Patent Literature 1, the holding rigidity of the shaft 106 was insufficient because the shaft 106 was only supported at the upper and lower ends thereof. For this reason, when a minute rotational vibration of the rotor 103 is transmitted to the shaft 106, the shaft 106 vibrates and its rotation becomes unstable, and there is a possibility that the rotation of the rotor 103 becomes more unstable synergistically. This causes vibration noise of the pump, and may also reduce the pump efficiency.
[0005]
Further, in the pump 100 described in Patent Document 1, since the upper end of the shaft 106 is supported by the rib 113 located at the suction port 112 of the casing cover 109, the rib 113 forms a liquid flow path passing through the suction port 112. It was resistance. This causes noise when the liquid flows, and also reduces the pump efficiency.
[0006]
The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the pump efficiency by reducing vibration noise by stabilizing the rotation of a rotor in an outer rotor type motor configuration. An object of the present invention is to provide a motor pump that can be used.
[0007]
[Means for Solving the Problems]
Means for Solving the Problems To achieve the above object, an invention according to claim 1 includes a casing including a pump chamber, a suction port, and a discharge port, a stator fixed to the casing and having a core wound with a coil, and a center of the stator. And a rotor provided rotatably on the outer periphery of the stator around the shaft, including a magnet, and an impeller provided in the pump chamber so as to be able to rotate integrally with the rotor, In a motor pump configured to discharge liquid sucked into a pump chamber from a suction port by rotation of an impeller to the outside from a discharge port, a shaft passes through a stator and is fixed to the stator. The rotor is rotatably provided at the tip of the shaft.
[0008]
According to the configuration of the present invention, when the coil is energized, the magnetic field acts between the coil and the rotor arranged on the outer periphery of the stator, and the rotor rotates integrally with the impeller about the shaft. With the rotation of the impeller, the liquid is sucked into the pump chamber from the suction port, and is discharged from the discharge port to the outside. Here, since the shaft passes through the stator and is fixed to the stator, the holding rigidity of the shaft increases. Further, since the rotor rotates on the shaft having high holding rigidity, rotational vibration of the rotor is reduced.
[0009]
In order to achieve the above object, a second aspect of the present invention is directed to the first aspect of the present invention, wherein the base end of the shaft is supported by a bottom wall of the casing.
[0010]
According to the configuration of the present invention, the holding rigidity of the shaft is further increased with respect to the operation of the first aspect.
[0011]
In order to achieve the above object, a third aspect of the present invention is characterized in that, in the first or second aspect of the present invention, the stator is molded integrally with the casing using a resin.
[0012]
According to the configuration of the present invention, in addition to the effect of the invention described in claim 1 or 2, heat generated by the stator is easily transmitted to the outside via the resin mold.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
[First Embodiment]
Hereinafter, a first embodiment of a motor pump according to the present invention will be described in detail with reference to the drawings.
[0014]
FIG. 1 is a sectional view showing a motor pump 1 according to the present embodiment. FIG. 2 shows a cross-sectional view along the line AA in FIG. The motor pump 1 basically includes a casing 2, a stator 3, a rotor 4, an impeller 5, and the like provided inside the casing 2. The stator 3 and the rotor 4 constitute an outer rotor type motor. The casing 2 includes a body 6, a cover 7 that covers the upper side of the body 6, and a lower plate 8 that covers a lower side of the body 6. The body 6 and the cover 7 are detachably assembled to each other by flanges 6a, 7a. At the center of the cover 7, an inlet 9 that opens upward is formed. Similarly, a discharge port 10 that opens in the lateral direction is formed on the outer periphery of the cover 7. The space surrounded by the body 6 and the cover 7 is a pump chamber 11. The lower plate 8 is detachably attached to the lower opening 6b of the body 6. The space surrounded by the body 6 and the lower plate 8 is a wiring room 12.
[0015]
Stator 3 is fixed to body 6. The stator 3 is configured by winding a coil 14 around a metal core 13. A holder 15 is arranged at the lower center of the core 13. A shaft 16 is arranged at the center of the stator 3. The shaft 16 passes through the stator 3 and is fixed to the stator 3. Specifically, the shaft 16 passes through the center of the core 13 and the holder 15 and is fixed to the core 13 and the holder 15. In this embodiment, the shaft 16 is fixed to the core 13 and the holder 15 by press-fitting the shaft 16 into the central hole 13a of the core 13 and the center hole 15a of the holder 15. Thus, the shaft 16 is integrally fixed to the stator 3. A seal ring 17 is provided above the core 13 and between the core 13 and the shaft 16. The wiring of the coil 14 is connected to the holder 15. In this embodiment, the stator 3 is molded integrally with the body 6 using a resin. The distal end 16a of the shaft 16 that penetrates through the stator 3 is located above the stator 3, and the proximal end 16b of the shaft 16 is located below the stator 3. In this embodiment, the stator 3, the holder 15, and the shaft 16 excluding the distal end portion 16a and the proximal end portion 16b of the shaft 16 are integrally molded with the body 6 by resin. The space surrounded by the mold portion of the stator 3 and the peripheral wall of the body 6 is a peripheral groove 18.
[0016]
The substantially cup-shaped rotor 4 is arranged so as to cover the molded stator 3. An outer peripheral portion of the rotor 4 is incorporated into a peripheral groove 18 of the body 6. In this state, the rotor 4 is provided rotatably around the shaft 16 around the outer periphery of the stator 3. The rotor 4 is entirely composed of a plastic magnet. The rotor 4 is rotatably supported by a tip 16 a of the shaft 16, and is prevented from coming off the shaft 16 by a screw 19.
[0017]
The plurality of impellers 5 are provided on the upper side surface of the rotor 4 so as to be integrally rotatable with the rotor 4. These impellers 5 are arranged in the pump chamber 11. In this embodiment, each impeller 5 is formed integrally with the rotor 4. With this configuration, when the impeller 5 rotates together with the rotor 4 about the shaft 16, the liquid is sucked from the suction port 9 into the pump chamber 11 with the rotation, and the liquid is discharged from the discharge port 10 to the outside. It has become.
[0018]
An electric board 20 is arranged in the wiring chamber 12 of the body 6. The electric board 20 is fixed to the lower surface of the molded portion of the stator 3. The base end portion 16b of the shaft 16 penetrates the electric board 20. A terminal 21 extending from the holder 15 is connected to the electric board 20. A connector 22 is provided on one side of the body 6. A terminal 23 is integrally molded with the connector 22 using a resin. The lower end of the terminal 23 is connected to the electric board 20. A bearing 8 a is formed on the upper surface of the lower plate 8 corresponding to the base end 16 b of the shaft 16. A part of the base end 16b of the shaft 16 is fitted into the bearing 8a, and the base end 16b of the shaft 16 is supported by the lower plate 8 serving as the bottom wall of the casing 2.
[0019]
To manufacture the motor pump 1, first, as shown in FIG. 3A, a stator assembly 24 in which the core 13, the coil 14, the holder 15, and the shaft 16 are integrally assembled is prepared in advance. To configure the assembly 24, the shaft 16 is press-fitted into the center hole 13a of the core 13 and the center hole 15a of the holder 15. Also, as shown in FIG. 3B, a terminal 23 for the connector 22 is prepared.
[0020]
Then, with the stator assembly 24 and the terminals 23 inserted into the cavities of the resin mold, resin melt is poured into the cavities, so that the stator assemblies 24 and the terminals 23 are made of resin as shown in FIG. 6 is integrally molded.
[0021]
After that, the rotor 4 is attached to the tip 16 a of the shaft 16, and the cover 7 is attached to the upper side of the body 6. Further, by mounting and wiring the electric board 20 and the like in the wiring chamber 12 of the body 6, and closing the lower opening 6b with the lower plate 8, a completed product of the motor pump 1 as shown in FIG. 1 is obtained.
[0022]
According to the configuration of the motor pump 1 of the present embodiment described above, when the coil 14 of the stator 3 is energized, a magnetic field acts between the stator 3 and the rotor 4, and the rotor 4 Rotates integrally with the impeller 5. As the impeller 5 rotates, the liquid is sucked from the suction port 9 into the pump chamber 11, and the sucked liquid is discharged from the discharge port 10 to the outside. In the motor pump 1 of this embodiment, since an outer rotor type motor is employed, the entire pump can be downsized in spite of a larger discharge amount than when an inner rotor type motor is employed.
[0023]
Here, since the shaft 16 passes through the stator 3 and is fixed to the stator 3, the holding rigidity of the shaft 16 is increased. Further, since the rotor 4 rotates on the shaft 16 having high holding rigidity, the rotational vibration of the rotor 4 is reduced. Therefore, in the outer rotor type motor configuration, the rotation of the rotor 4 can be stabilized, and the vibration noise of the motor pump 1 can be reduced. Further, since the rotation of the rotor 4 is stabilized, the impeller 5 rotates smoothly, and the suction of the liquid into the suction port 9 and the discharge of the liquid from the discharge port 10 become smooth, thereby improving the pump efficiency. Can be done. And the power consumption of the motor pump 1 can be reduced by the amount by which the pump efficiency is improved.
[0024]
In this embodiment, since the base end 16b of the shaft 16 is supported by the bearing 8a of the lower plate 8, the holding rigidity of the shaft 16 is further increased. In this sense, the rotation of the rotor 4 can be further stabilized, the vibration noise can be further reduced, and the pump efficiency can be further improved.
[0025]
In this embodiment, since the stator 3 is molded integrally with the body 6 using a resin, as shown in FIG. 5, heat generated from the stator 3 is easily transmitted to the outside via the resin mold. Therefore, heat radiation of the stator 3 to the body 6 is greatly improved, and the stator 3 can be efficiently cooled. As a result, a decrease in motor efficiency due to heat generation in the motor pump 1 can be suppressed, and durability against heat generation can be improved.
[0026]
In this embodiment, as shown in FIG. 5, a fine gap is formed between the circumferential groove 18 and the rotor 4, and the liquid sucked into the pump chamber 11 flows through the gap. In this sense, the cooling efficiency of the motor pump 1 can be improved.
[0027]
The motor pump 1 of this embodiment is different from the conventional pump 100 in which the upper end of the shaft 106 is supported by the rib 113 located at the suction port 112, and the pump that supports the upper end of the shaft 16 is different from the pump 100 of the conventional example. Nothing is provided in the middle of the liquid flow path from to the impeller 5. Therefore, there is no obstacle that becomes a flow path resistance for the liquid sucked from the suction port 9, and the liquid can be smoothly guided to the pump chamber 11 and can be smoothly discharged from the discharge port 10.
[0028]
[Second embodiment]
Next, a second embodiment of the motor pump of the present invention will be described in detail with reference to the drawings.
[0029]
In the following embodiments including this embodiment, the same reference numerals are given to the same components as those in the first embodiment, and the description will be omitted. Hereinafter, different points will be mainly described.
[0030]
FIG. 6 is a sectional view showing a motor pump 31 according to the present embodiment. The motor pump 31 of this embodiment differs from the motor pump 1 of the first embodiment in the configuration of the rotor 4. That is, in the first embodiment, the entire rotor 4 is formed of a plastic magnet. On the other hand, in the present embodiment, the rotor 4 is configured by fixing the yoke 33 and the magnet 34 inside the resin-made rotor frame 32 having a substantially cup shape. The yoke 33 and the magnet 34 are molded by insert and fixed to the rotor frame 32 when the rotor frame 32 is molded with resin. In this embodiment, the other configuration of the motor pump 31 is basically the same as that of the motor pump 1 in the first embodiment.
[0031]
Therefore, also with the motor pump 31 of this embodiment, it is possible to obtain basically the same operation and effects as those of the motor pump 1 of the first embodiment.
[0032]
[Third Embodiment]
Next, a third embodiment embodying the motor pump of the present invention will be described in detail with reference to the drawings.
[0033]
FIG. 7 is a sectional view showing a motor pump 41 according to the present embodiment. The motor pump 41 of this embodiment differs from the motor pump 1 of the first embodiment in that the base end 16b of the shaft 16 does not penetrate the holder 15 downward. That is, in the first embodiment, the distal end portion 16a and the proximal end portion 16b of the shaft 16 penetrate the stator 3 and extend vertically. On the other hand, in the present embodiment, only the distal end 16 a of the shaft 16 extends upward through the stator 3, and the base end of the shaft 16 does not extend below the holder 15. The base end 16 b of the shaft 16 is not supported on the upper surface of the lower plate 8. In this embodiment, the other configuration of the motor pump 41 is basically the same as that of the motor pump 1 in the first embodiment.
[0034]
Therefore, in the motor pump 41 of this embodiment, the holding rigidity of the shaft 16 is reduced as compared with that of the first embodiment, because the base end of the shaft 16 is not supported on the lower plate 8. However, since the intermediate portion of the shaft 16 is fixed to the stator 3 in a wide range, the basic holding rigidity of the shaft 16 is not affected. In addition, the motor pump 41 of this embodiment can also obtain basically the same operation and effects as those of the motor pump 1 of the first embodiment.
[0035]
[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described in detail with reference to the drawings.
[0036]
FIG. 8 is a sectional view showing a motor pump 51 according to the present embodiment. The motor pump 51 of this embodiment differs from the motor pump 1 of the first embodiment in that the stator 3 is not molded integrally with the body 6 and that the entire rotor 4 is not made of a plastic magnet. That is, in the motor pump 51 of this embodiment, the housing recess 53 is formed by the partition wall 52 integral with the body 6, and the stator 3 is housed inside the housing recess 53. Further, the rotor 4 is formed by fixing the yoke 33 and the magnet 34 inside the rotor frame 32. In this embodiment, a coil spring 54 is provided between the electric board 20 and the lower plate 8 on the base end 16 b of the shaft 16 in order to stably hold the stator 3 on the body 6. In this embodiment, the other basic configuration of the motor pump 51 is the same as that of the motor pump 1 in the first embodiment.
[0037]
Therefore, according to the motor pump 51 of this embodiment, the amount of resin used for the body 6 is reduced because the stator 3 is not molded integrally with the body 6 by resin, and the motor pump 51 is reduced in weight. Can be. In addition, the motor pump 51 according to this embodiment can also obtain basically the same operation and effects as those of the motor pump 1 according to the first embodiment.
[0038]
It should be noted that the present invention is not limited to the above embodiments, and a part of the configuration can be appropriately changed and implemented without departing from the spirit of the invention.
[0039]
【The invention's effect】
According to the first aspect of the invention, the holding rigidity of the shaft is increased, and the rotational vibration of the rotor is reduced. Therefore, in the outer rotor type motor configuration, the rotation of the rotor can be stabilized, the vibration noise can be reduced, and the pump efficiency can be improved.
[0040]
According to the second aspect of the present invention, the holding rigidity of the shaft is further increased, so that the rotation of the rotor can be further stabilized, and the vibration noise can be further reduced with respect to the effects of the first aspect of the present invention. The pump efficiency can be further improved.
[0041]
According to the third aspect of the invention, the heat generated by the stator is easily transmitted to the outside via the resin mold. Therefore, in addition to the effects of the first or second aspect, the stator can be efficiently cooled. In addition, a decrease in motor efficiency due to heat generation can be suppressed, and durability against heat generation can be improved.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a motor pump according to a first embodiment.
FIG. 2 is a sectional view taken along the line AA of FIG. 1;
3A is a sectional view of a stator assembly, and FIG. 3B is a front view of a terminal.
FIG. 4 is a sectional view showing a body formed by molding a stator assembly.
FIG. 5 is an enlarged sectional view showing a part of the motor pump.
FIG. 6 is a sectional view showing a motor pump according to the second embodiment.
FIG. 7 is a sectional view showing a motor pump according to a third embodiment.
FIG. 8 is a sectional view showing a motor pump according to a fourth embodiment.
FIG. 9 is a sectional view showing a conventional pump.
[Explanation of symbols]
Reference Signs List 1 motor pump 2 casing 3 stator 4 rotor 5 impeller 8a bearing 9 suction port 10 discharge port 11 pump chamber 13 core 14 coil 16 shaft 16a upper end 16b lower end 31 motor pump 34 magnet 51 motor pump

Claims (3)

A casing including a pump chamber, a suction port and a discharge port,
A stator fixed to the casing and wound with a coil around a core;
A shaft disposed at the center of the stator;
A rotor rotatably provided on the outer periphery of the stator around the shaft and including a magnet;
An impeller provided in the pump chamber so as to be integrally rotatable with the rotor, wherein the liquid sucked into the pump chamber from the suction port with the rotation of the impeller is discharged from the discharge port to the outside. In the motor pump configured in
The shaft penetrates through the stator and is fixed to the stator;
The rotor is rotatably provided at a tip end of the shaft penetrating the stator. The motor pump according to claim 1, wherein a base end of the shaft is supported on a bottom wall of the casing. The motor pump according to claim 1, wherein the stator is molded integrally with the casing using a resin.

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