JP2006296006A - Cooler for motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooler for a motor which prevents the heat from a load device from being transmitted to the motor by improving the cooling effect of the motor main body and preventing the heat transmission and heat radiation from the load device. <P>SOLUTION: The cooling device for a motor, which is fitted to a load machine storing internally a high temperature medium and rotates fan impellers stirring the high temperature medium, comprises a cooling fan fitted to the motor shaft between the load machine and the motor, and an intermediate attachment mount which is arranged between the cooling fan and the load machine and fitted to the load machine, wherein a protection wall is formed in the outer peripheral position of the cooling fan of the intermediate attachment mount. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric motor cooling device attached to a load machine having a high temperature portion as an electric load machine such as a reflow furnace.

As an electric motor attached to a load machine (hereinafter referred to as a load device) having a high temperature part such as a reflow furnace apparatus, a conduction hole for circulating cooling air is formed in the rotating shaft of the motor, and the rotating shaft rotates, thereby cooling air Is circulated in the conduction hole to cool the bearing that supports the rotating shaft of the electric motor (for example, see Patent Document 1).

Japanese Utility Model Publication No. 3-97363 (page 2, line 2, line 6, FIG. 1)

According to this electric motor, as the rotating shaft rotates, the cooling fan attached to the rotating shaft is rotated to generate cooling air, thereby cooling the electric motor. At this time, along with the generation of the cooling air, the cooling air is generated from the introduction port of the air guide hole formed in the rotating shaft to the discharge port. As a result, the bearing is cooled as the rotating shaft is cooled by the cooling air. In the load device, a hot air fan is attached to the tip of the rotating shaft, and the medium in the load device is stirred and circulated by the rotation of the hot air fan. As a result, the temperature of the medium in the load device is made uniform and maintained at a constant temperature, whereby the required temperature can be maintained.

  In the conventional motor cooling device, as described above, the hot air fan that stirs the high-temperature air heated by the heating member in the load device is integrated with the rotation shaft at the tip of the rotation shaft located in the load device. It is attached so that it may rotate. That is, the structure is such that hot air is generated in the load device as the hot air fan rotates. For this reason, high-temperature heat is transmitted from the hot air fan to the main body of the electric motor via the rotating shaft. Further, high-temperature heat from the load device is transmitted from the load-side bracket to the motor frame, bearings, and the interior of the motor to the main body of the motor.

In this way, since the high-temperature heat from the load device is transmitted to the main body side of the electric motor via the rotating shaft, the temperature of the bearing fitted to the housing portion of the load-side bracket rises and is damaged or remarkably There was a problem of shortening the service life.

In addition, high-temperature heat from the load device is transmitted from the load device through the load-side bracket to the motor, and is transmitted to the motor coil through the frame of the motor body and its space, so that the coil temperature rises, When the allowable temperature is exceeded, there is a problem that the coil is damaged or the life of the coil is shortened.

Furthermore, since the structure of the motor is a fully closed type, in order to dissipate the heat transmitted from the load device to the outside, the heat is dissipated to the outside after being transmitted to the frame of the motor. There was a problem that there were few.

The present invention has been made in order to solve the above-described problems of the conventional motor cooling device, and is intended to improve the cooling of the electric motor body and to prevent the heat transmission and heat dissipation from the load device. An object of the present invention is to provide a cooling device for an electric motor that does not transmit to the motor.

An electric motor cooling device according to the present invention is an electric motor cooling device that is attached to a load machine that houses a high-temperature medium therein and rotates a fan impeller that stirs the high-temperature medium between the load machine and the electric motor. A cooling fan attached to the motor shaft; and an intermediate mounting seat installed between the cooling fan and the load machine, and attached to the load machine, the outer circumference of the cooling fan of the intermediate mounting seat A protective wall is formed at the part position.

  According to this invention, by providing the cooling fan between the motor on the motor shaft and the intermediate mounting seat, the transmission heat transmitted from the load device to the motor from the load device can be shielded by the cooling fan, Furthermore, there is an effect of suppressing the heat dissipated to the outside and transmitted to the electric motor.

Embodiment 1 FIG.
1 is a partial cross-sectional front view of an electric motor cooling apparatus according to Embodiment 1 of the present invention. In FIG. 1, an electric motor is constituted by a frame 1 of an electric motor, an anti-load side bracket 2, a load side bracket 3, and an electric motor shaft 4 extending from the electric motor body to the load side. An agitating fan impeller 7 for agitating a medium in a load device (not shown) having a high-temperature portion serving as a counterpart machine is attached to the tip of the motor shaft 4 extending from the motor main body to the load side. A space 8 in the load device surrounded by 6 stores a high-temperature gas or a high-temperature liquid.

The bearing 9 housed in the housing portion of the load side bracket 3 is inserted into the motor shaft 4. A stator core 10 is mounted in the frame 1 of the electric motor, and a stator coil 11 of the electric motor is inserted into the stator core 10.

An air hole 1 a is formed in the frame 1 of the electric motor, and an air hole 3 a is formed in the load side bracket 3. The cooling fan 12 is provided on the motor output shaft between the tip of the output shaft of the motor and the motor main body, and an intermediate mounting seat 13 made of a cast or steel plate is provided between the motor main body and the load device. The intermediate mounting seat 13 has a protective wall 13 a that functions as a protective function for the cooling fan 12. The protective wall 13 a is disposed so as to cover the outer circumferential portion of the cooling fan 12 in the radial direction. Yes. The load side bracket 3 is fixed to the intermediate mounting seat 13 by mounting bolts 5. The intermediate mounting seat 13 is fixed to the mounting seat 6 of the load device by a mounting bolt 14, and an inclined portion that guides the flow of cooling air from the cooling fan 12 is attached to the mounting portion of the intermediate mounting seat 13 to the load device. 13b is formed. 2 is a view as seen from arrows A and B in FIG. 1. Arrow A is a diagram showing the shape of the intermediate mounting seat 13 of the motor as seen from the load device, and arrow B is cooling. FIG. 3 is a view of the fan 12 as viewed from a direction parallel to the axial direction of the electric motor shaft 4.

The electric motor cooling apparatus according to the first embodiment is configured as described above. Next, the operation and action will be described.
FIG. 3 illustrates the heat transfer from the load device and the flow of the cooling air of the motor in the apparatus of FIG. The solid line arrows represent the flow of heat transfer from the load device to the electric motor via the intermediate mounting seat 13, and the flow of cooling air by the cooling fan 12. A broken line arrow indicates the flow of cooling air from the electric motor to the intermediate mounting seat 13 via the cooling fan 12 by the cooling fan 12.

1 to 3, the cooling fan 12 provided on the motor shaft 4 also rotates due to the rotation of the motor shaft 4 extending from the motor to the load device. As a result, cooling air is sucked into the motor through the air holes 1a of the frame of the motor. The sucked cooling air passes through the air hole 3a of the load side bracket 3 and is discharged to the outside. Further, a space for mounting the cooling fan 12 is secured by the intermediate mounting seat 13, and the cooling air is rectified and discharged to the outside by the protective wall 13a of the intermediate mounting seat.

  As described above, according to the first embodiment, by providing the cooling fan 12 between the electric motor on the electric motor shaft 4 and the intermediate mounting seat 13, the transfer heat transmitted from the load device to the electric motor to the electric motor 4 can be reduced. The cooling fan 12 can be shielded and further has an effect of radiating heat to the outside and suppressing heat transmitted to the electric motor.

Further, by providing the intermediate mounting seat 13, the load side bracket 3 can be prevented from directly transferring heat from the load device, and the cooling fan 12 can be protected. Furthermore, by providing the intermediate mounting seat 13 with the protective wall 13a, the cooling air can be rectified, the strength of the intermediate mounting seat 13 can be secured, and the heat radiation area of the intermediate mounting seat 13 can be increased. .

In addition, by providing the protective wall 13a of the intermediate mounting seat 13, finger insertion into the cooling fan 12 can be prevented, and accidents with rotating objects can be reduced.

Further, by providing the air hole 1a in the frame 1 of the motor, the cooling air can be taken into the motor, the stator core 10 and the stator coil 11 can be cooled, and the air hole 3a is provided in the load side bracket 3. Thus, the cooling air taken into the motor can be taken out of the motor. Thereby, the heat generated in the stator coil 11 and the bearing 9 can be cooled.

Embodiment 2. FIG.
4 is a partial cross-sectional front view of an electric motor cooling apparatus according to Embodiment 2 of the present invention. In the second embodiment, the shape of the protective wall 40a formed on the intermediate mounting seat 40 is changed to enhance the cooling air rectifying action. That is, the protective wall 40a is formed in a multi-stage shape in the direction of the electric motor shaft 4, a gap is formed between the protective walls 40a, and the cooling air is rectified and discharged to the outside. Other configurations are the same as those in the first embodiment, and a description thereof will be omitted.

FIG. 5 shows a view as seen from arrows C and D in FIG. 4. Arrow C is a view showing the shape of the intermediate mounting seat 40 of the motor as seen from the load device, and arrow D is cooling. It is a figure from the direction in which the fan 12 is parallel to the axial direction of the motor shaft 4. FIG.

FIG. 6 illustrates the heat transfer from the load device and the flow of the cooling air of the electric motor in the structure of FIG. 4 which is Embodiment 2 of the present invention. The solid line arrows represent the flow of heat transfer from the load device to the electric motor via the intermediate mounting seat 40, and the flow of cooling air by the cooling fan 12. The broken-line arrows represent the flow of cooling air from the electric motor to the intermediate mounting seat 40 via the cooling fan 12 by the cooling fan 12.

The motor cooling device according to the second embodiment is configured as described above, and the operation and action will be described next.
4 to 6, the cooling fan 12 provided on the motor shaft 4 also rotates due to the rotation of the motor shaft 4 extending from the motor to the load device. As a result, cooling air is sucked into the motor through the air holes 1a of the frame of the motor. The sucked cooling air passes through the air hole 3a of the load side bracket 3 and is discharged to the outside. Further, a space for mounting the cooling fan 12 is secured by the intermediate mounting seat 40, and the cooling air is rectified by the protective wall 40 a of the intermediate mounting seat 40 and is discharged to the outside.

As described above, according to the second embodiment, in addition to the effects of the first embodiment, the shape of the protective wall 40a formed on the intermediate mounting seat 40 is multi-staged in the direction of the motor shaft 4 so Since the gap is formed, the effect of rectifying the cooling air of the cooling fan 12 and releasing it to the outside is enhanced.

In each of the above embodiments, the material of the intermediate mounting seat is a steel material of a cast or a steel plate. However, by using aluminum or other light alloy, it is possible to make the material highly heat transfer and reduce the weight of the device. In addition, by using a material with low heat transfer property, heat transfer of the intermediate mounting seat 13 can be prevented and only heat transfer of the motor shaft 4 can be achieved.

  The motor cooling device according to the present invention can prevent heat transfer and heat dissipation from the load machine having the high temperature part to the motor in the electric motor attached to the load machine having the high temperature part. There is a big one.

It is a figure which shows the cooling device of the electric motor concerning Embodiment 1 of this invention. It is the figure seen from the arrow A and arrow B of FIG. It is the figure which showed the flow of the heat transfer in the cooling device of the electric motor concerning Embodiment 1 of this invention, and the flow of the cooling air. It is a figure which shows the cooling device of the electric motor concerning Embodiment 2 of this invention. It is the figure seen from the arrow C and arrow D of FIG. It is the figure which showed the flow of the heat transfer in the cooling device of the electric motor concerning Embodiment 2 of this invention, and the flow of the cooling air.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor frame 1a Motor frame air hole 2 Anti-load side bracket 3 Load side bracket 3a Air hole 4 Motor shaft 5 Mounting bolt 6 Load device mounting seat 7 Fan impeller 8 Space in load device 9 Bearing 10 Stator core 11 Fixed Child coil 12 Cooling fan 13, 40 Intermediate mounting seat 13a, 40a Protective wall 14 Mounting bolt

Claims (3)

In a cooling device for an electric motor that is attached to a load machine that stores a high temperature medium therein and rotates a fan impeller that stirs the high temperature medium.
A cooling fan attached to the motor shaft between the load machine and the motor;
An intermediate mounting seat installed between the cooling fan and the load machine and attached to the load machine;
A motor cooling device, wherein a protective wall is formed at a position of the outer circumferential portion of the cooling fan of the intermediate mounting seat. The motor cooling device according to claim 1, wherein the protective wall is formed in a multistage shape in the motor shaft direction, and a gap is formed between the protective walls. The motor cooling device according to claim 1 or 2, wherein an inclined portion for guiding a flow of cooling air from the cooling fan is formed in a portion where the intermediate mounting seat is attached to the load machine. .

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