JPH07247985A - Pump with motor cooling mechanism - Google Patents

Abstract

PURPOSE:To lower the level of noise produced by rotation of a cooling fan by changing the position of an air discharge port. CONSTITUTION:A first space 16 and a second space 28 which are divided by a diaphragm 30 is provided in the interior of a housing 14 of a motor 10. A pump driving means 27 for driving a pump main body 12 is stored in the interior of the second space 28. The first space 16 and the outside air are connected to each other by an air suction port 18, the first space 16 and the second space 28 are connected to each other by an air passing port 32, and the second space 28 and the outside air are connected to each other by an air discharge port 36. A cooling fan 34 is fitted to the pump driving means 27, and the motor 10 is cooled with air sucked from the air suction port 18 by rotation of the cooling fan 34. The position of the air discharge port 36 in the housing 14 is set in a position different from the position opposite to the rotational outer peripheral part of the cooling fan 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor cooling mechanism pump having a fan for cooling a motor, and more particularly to a motor cooling mechanism pump for reducing the noise caused by the cooling fan cutting air. It is about.

[0002]

2. Description of the Related Art FIG. 6 is a sectional view of a conventional pump with a cooling mechanism for a motor, and FIG. 7 is a sectional view taken along line BB of FIG. The pump with a cooling mechanism for a motor has a motor 10 and a pump body 12. A pump drive driving means 27 having a cooling fan 34 is attached to the rotary shaft 20 of the motor 10, and the pump main body 12 is operated by the pump drive driving means 27. The motor 10 includes a housing 14,
The housing 14 has a first space 16 therein. The housing 14 has a configuration (closed by the pump body 12) in which a second space 28 that is partitioned from the first space 16 is formed inside via a partition plate 30. The pump drive driving means 2 is provided in the space 28.
7 are accommodated. The housing 14 includes an external and a first
Is provided with an air suction port 18 that communicates with the space 16 of the second space 28.
Is provided. The partition plate 30 has a first space 1
An air through hole 32 is provided that connects 6 and the second space 28. The cooling fan 34 is arranged at a position facing the partition plate 30. Further, the air discharge port 36 formed in the housing 14 is provided at a position facing the rotation outer peripheral portion of the cooling fan 34 (a cylindrical side surface formed when the cooling fan 34 is rotated).

When the motor 10 operates, the cooling fan 34 attached to the pump drive driving means 27 rotates, and air is introduced into the first space 16 from the air inlet 18, and the air cools the motor 10. After that, the air through hole 3
Air is discharged from 2 through the second space 28 through the air discharge port 36. Further, the operation of the motor 10 causes the pump body 12 to be operated via the pump drive driving means 27.

[0004]

The air passing through the air through hole 32 of the partition plate 30 is intermittently cut by the cooling fan 34 to generate noise (wind noise). Further, the air that has moved from the air through port 32 to the second space 24 is intermittently cut by the cooling fan 34 when discharged from the air discharge port 36, and noise (wind noise) is also generated from this portion. To do. The noises from these two places are combined to generate a large amount of noise, which is a problem in an apartment house when the magnet drive pump is used in a home heating device or the like.

Further, the noise from the above two places is larger from the air discharge port 36 where the peripheral speed of the cooling fan 34 is high, and the noise increases as the size of the pump increases. Therefore, it is conceivable to reduce the diameter of the cooling fan 34 to reduce the peripheral speed to reduce noise, but this causes a problem such that the amount of intake air decreases and the cooling effect of the motor 10 decreases. .

The present invention has been made to solve the above problems, and by changing the position of the air discharge port,
An object of the present invention is to provide a pump with a cooling mechanism for a motor capable of reducing the noise level generated by the rotation of a cooling fan when the pump is operating.

[0007]

According to the present invention, there is provided a motor having a housing, a first space formed in the housing of the motor, a pump driving means attached to a rotary shaft of the motor, and the pump driving means. A cooling fan attached to the housing, a housing for accommodating the pump driving means therein, a second space formed in the housing, and a partition plate for partitioning the first space and the second space, An air through hole that is formed in the partition plate and that connects the first space and the second space, an air suction port that communicates the first space with the outside air, and the second space. And an outside air communicating with the outside air, and a pump main body driven by the pump driving means, and a cooling fan attached to the pump driving means is rotated by rotation of the motor,
A pump with a cooling mechanism for a motor, which sucks air from an air suction port into a first space, and discharges this air from a first space through an air through port and a second space through an air discharge port, wherein: The position of the discharge port is provided at a position different from the position facing the rotating outer peripheral portion of the cooling fan.

[0008]

In the present invention, the second housing for accommodating the cooling fan
The air discharge port is provided at a position different from the position where the rotating outer peripheral portions of the cooling fan face each other in the air inlet / outlet to / from the space. As a result, the rotating outer periphery of the cooling fan does not cut off the air discharged from the air discharge port,
Therefore, the wind noise is significantly reduced.

[0009]

First Embodiment The present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view showing an embodiment of a pump with a cooling mechanism for a motor according to the present invention, and FIG. 2 is a right side view of FIG. 1 and 2, the same reference numerals as those in FIG. 6 indicate the same parts. The pump has a motor 10 and a pump body 12. The motor 10 includes a housing 14 and has a first space 16 in the housing 14. This housing 1
An air intake port 18 that connects the outside air and the first space 16 is provided in the No. 4. On the rotary shaft 20 of the motor 10,
A cup-shaped drive magnet wheel 22 for driving a pump described later is attached by a fixing means 24 such as a nut, and a plurality of drive magnets 26 are provided inside the cup-shaped drive magnet wheel 22. The drive magnet wheel 22 and the drive magnet 26 allow the pump body 1 to
A pump driving means 27 for activating 2 is configured. The pump driving means 27 is not limited to this configuration.

The housing 14 of the motor 10 has a shape capable of accommodating the drive magnet ring 22 therein, and the region for accommodating the drive magnet wheel 22 inside is formed into a second region.
Of space 28. The housing 14 includes the first
A partition plate 30 for partitioning the space 16 and the second space 28 is integrally formed. That is, the housing 1
Reference numeral 4 serves both as a housing for the motor 10 and a housing for housing the drive magnet wheel 22 therein. However, instead of the housing 14, the housing may be separated into a housing for only the motor 10 and a housing for housing the drive magnet wheel 22 therein (in this case, the partition plate 30 is either May be formed as part of the housing). The partition plate 30 is provided with a plurality of air through holes 32 that connect the first space 16 and the second space 28. In the drive magnet wheel 22,
The cooling fan 34 is attached at a position facing the partition plate 30.

The housing 14 is provided with an air discharge port 36 that connects the second space 28 and the outside air. The air discharge port 36 is provided at a position different from the position of the housing 14 facing the rotation outer peripheral portion of the cooling fan 34. The air outlet 36 is preferably provided on the joint surface between the non-magnetic case 32 and the housing 14.

The pump body 12 includes a front case 38.
A non-magnetic case 40 and a pump chamber 42 formed by the front case 38 and the non-magnetic case 40.
And the driven magnet ring 44 housed in the pump chamber 42.
And an impeller 46 connected thereto. The pump chamber 42 communicates with a suction port 48 and a discharge port 50. The non-magnetic case 40 is the cup-shaped drive magnet ring 2
2 has a cup-like shape that can be housed inside, and the driven magnet ring 44 is housed in the cup-shaped non-magnetic case 40 and is set to face the drive magnet ring 22. The non-magnetic case 40 is for partitioning the second space 28, and is set so as to be joined to the housing 14. Although resin is used as the material of the non-magnetic case 40, the material is not limited to resin, and a non-magnetic metal plate or the like may be used. The driven magnet ring 44 is provided with a plurality of driven magnets 52 on the outer peripheral portion thereof, and two bearings 5 are provided.
It is rotatably supported by 4. Drive magnet ring 2
A plurality of poles are magnetized in the driving magnet 26 on the inner surface of 2, and a plurality of poles are also magnetized in the driven magnet 52 on the outer peripheral portion of the driven magnet ring 44, whereby the opposite poles attract each other. Performs synchronous rotation.

In this motor cooling pump, when the motor 10 operates, the drive magnet wheel 22 rotates, and the magnetic force of the drive magnet 22 causes the driven magnet wheel 44 to rotate. The integral impeller 46 rotates. By the rotation of the impeller 46, the fluid is sucked from the suction port 48 of the pump and discharged from the discharge port 50. In FIG. 3, a state in which air is discharged from the second space 28 to the outside air through the air discharge port 36 is shown by an arrow. The inside of the motor 10 generates heat as the rotary shaft 20 of the motor 10 rotates, but the rotation of the cooling fan 34 sucks air into the first space 16 from the outside through the air suction port 18, and the sucked air The motor 10 is cooled with.

When the air sucked into the first space 16 from the air suction port 18 passes through the air through hole 32 formed in the partition plate 30 and moves to the second space 28, it is a cooling fan as in the conventional case. It is intermittently cut by 34 to generate noise. However, by setting the position of the air through hole 32 formed in the partition plate 30 to a position close to the rotation center of the cooling fan 34, the peripheral speed at the position of the cooling fan 34 facing the air through hole 32 becomes small, and the noise is reduced. Can be made smaller. On the other hand, the air that has moved to the second space 28 is discharged from the air discharge port 36, but since this air discharge port 36 is provided at a position different from the surface of the housing 14 that faces the outer peripheral portion of the rotation of the cooling fan 34. The air is not cut off by the cooling fan 34 when the air is discharged from the air discharge port 36. According to the motor-equipped cooling mechanism pump of the present invention, the noise generated by the rotation of the cooling fan 34 is the noise generated when the air passing through the air through hole 32 is cut (wind noise).
Moreover, since the noise from this portion is not so large, the noise level as a whole is significantly reduced. Further, since the position of the air discharge port 36 is farther from the position of the air through hole 32 as compared with the conventional one, the sound generated at the position of the air through hole 32 is slightly reduced when leaking from the air discharge port 36 to the outside.

The air discharge port 36 is connected to the pump body 12
By providing the (non-magnetic case 40) and the housing 14 at the joint, for example, if a recess is formed on the joint surface of the housing 14 with the non-magnetic case 40, the recess serves as the air discharge port 36. Alternatively, the housing 14 in the pump body 12 (non-magnetic case 40)
If a dent portion is formed on the joint surface with the dent portion, the dent portion becomes the air discharge port 36. In this way, if the recessed portion is formed on the joint surface between the housing 14 and the pump body 12 (non-magnetic case 40), it is not necessary to process the discharge port 38 later, and the manufacturing cost can be reduced. .

FIG. 4 is a diagram comparing the noise levels depending on the rotation speeds of the motor cooling mechanism pump of the present invention and the conventional motor cooling mechanism pump. According to this figure, the noise level (dB) (measured by the A characteristic) is lower in the motor cooling mechanism pump of the present invention at all rotation speeds (rpm) than in the conventional motor cooling mechanism pump. In particular, the difference is large at the normal operating speed (2,620 rpm).

[0017]

Second Embodiment FIG. 5 is a diagram showing another embodiment of the present invention. The structure is the same as that of the first embodiment, and the same reference numerals as those of the first embodiment indicate the same parts. The second embodiment differs from the first embodiment in that the non-magnetic case 58 has a disk shape and the driven magnet wheel 60 and the driving magnet wheel 62 face each other. The other structure is the same as that of the first embodiment. That is, the air discharge port 36 that connects the second space 28 and the outside air is provided at a position different from the position of the housing 14 that faces the rotation outer peripheral portion of the cooling fan 34. The air discharge port 36 includes the non-magnetic case 32 and the housing 1.
Provided on the joint surface with 4. Thus, the driven magnet wheel 60
By making the drive magnet ring 62 face-to-face with each other, the entire length can be shortened and the size can be reduced.

[0018]

According to the pump with cooling mechanism for a motor according to the present invention, the air outlet for cooling the motor is provided at a position different from the surface facing the rotating outer peripheral portion of the cooling fan, so that when the pump is operated. The wind noise caused by the cooling fan cutting off the air is reduced, so that the noise level generated can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a pump with a cooling mechanism for a motor according to the present invention.

FIG. 2 is a right side view of FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a diagram comparing noise levels of a pump with a cooling mechanism for a motor according to the present invention and a related art.

FIG. 5 is a cross-sectional view showing another embodiment of the present invention.

FIG. 6 is a sectional view of a conventional magnet drive pump.

7 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 10 Motor 12 Pump Main Body 14 Housing 16 First Space 18 Air Suction Port 20 Rotating Shaft 22 Drive Magnet Ring 26 Drive Magnet 28 Second Space 30 Partition Plate 32 Air Through Port 34 Cooling Fan 36 Air Discharge Port

Claims (3)

[Claims] 1. A motor having a housing, a first space formed in the housing of the motor, a pump drive means attached to a rotation shaft of the motor, a cooling fan attached to the pump drive means, and A housing for accommodating the pump driving means therein, a second space formed in the housing, a partition plate for partitioning the first space and the second space, and a partition plate formed on the partition plate In addition, an air through hole that connects the first space and the second space, an air intake port that communicates the first space with the outside air, and an air discharge port that communicates the second space with the outside air. An outlet and a pump main body driven by the pump drive means, and a cooling fan attached to the pump drive means is rotated by the rotation of the motor to suck air into the first space from the air suction port. In a pump with a cooling mechanism for a motor that discharges the air from the first space through the air through hole and through the second space through the air discharge port, the position of the air discharge port is opposed to the rotation outer peripheral portion of the cooling fan. A pump with a cooling mechanism for a motor, which is provided at a position different from the position. 2. The motor according to claim 1, wherein the position of the air discharge port is provided at a joint position between a housing that accommodates the pump driving means inside and the pump body. Pump with cooling mechanism. 3. A housing for the motor, a housing for housing the pump driving means, and a partition plate for partitioning the first space and the second space are integrally formed. The pump with a cooling mechanism for a motor according to claim 1.