JPH03222649A - Electric blower by inverter driving - Google Patents

Abstract

PURPOSE:To blow some of the cooling wind by the outer fans of a motor against a case, thereby making it transmit heat from this case to the bed, to cool an inverter by installing a motor for driving on the bed through the box- shaped case and storing the power source inverter of a motor in this case. CONSTITUTION:A motor 2 is installed on a bed through a box-shaped case 3 of totally enclosed structure, and an inverter 5, which converts and controls the power source frequency of a motor 2 so as to change the speed of this motor, is stored in the case 3. The bottom plate 3a of the case 3, to which this inverter is attached, is fixed in close contact with the bed 4. The heat generated in the inverter 5 is radiated from the outside surface of the case 3, and some of the cooling wind by outer fans 6 is blown against it, and also heat transmission is done to the bed in close contact and it is cooled.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an inverter-driven electric blower using an external fan-shaped motor, in which the inverter has a compact structure, is installed integrally with the electric blower, and is efficiently cooled. About what you can do.

(Prior Art) In an inverter-driven electric blower, the inverter is generally separately attached to an operating switchboard or the like.

[Problem to be solved by the invention]

However, the above-mentioned structural arrangement has the drawback that it requires a lot of work to connect the wiring between the inverter and the blower drive motor.

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, it is an object of the present invention to provide an inverter-driven electric blower in which an inverter is integrally housed in a compact structure and can be efficiently cooled.

[Means to solve the problem]

In order to achieve the above object, the inverter-driven electric blower of the present invention has an external fan-shaped motor for driving the blower,
This motor is installed on a platform via a box-shaped case with a fully open structure, and a power inverter for the motor is housed in the case, and a portion of the cooling air generated by the external fan of the motor is blown onto this case. Further, the inverter is cooled by transferring heat from the case to the base.

[Effect]

Since the radial dimension of the blower is generally larger than the radial dimension of the blower driving motor, a space is created between the motor and the mounting base. Utilizing this space, the integrally installed box-shaped case with a completely enclosed structure is efficiently cooled by a portion of the cooling air of the motor and heat transfer to the platform. A power inverter can be housed within the case.

〔Example〕

FIG. 1 shows an embodiment of the present invention, in which a blower 1 such as a multi-stage blower is driven by an external fan-shaped motor 2. As shown in FIG. The motor 2 is installed on a platform 4 via a box-shaped case 3 having a completely closed structure, and an inverter 5 is housed in the case 3 to appropriately convert and control the power frequency of the motor 2 and drive the motor at variable speeds. ing. The reason why the case 3 has a completely closed structure is to prevent damage to the inverter 5 due to intrusion of external dust, etc., and the bottom plate 3a of the case 3 to which the inverter 5 is installed is fixed closely to the base 4. be done. The heat generated by the inverter 5 is radiated from the outer surface of the case 3, and this case 3 is cooled and brought into close contact with a portion of the cooling air generated by the rotation of the outer fan 6 of the motor 2. Heat is transferred to the platform 4 and it is cooled.

According to the embodiment, the storage case 3 for the inverter 5 is installed integrally by utilizing the space created between the blower 1 and its drive motor 2 in the radial direction due to the difference in dimension between the motor 2 and the platform 4.
Since the inverter 5 is efficiently cooled by part of the cooling air from the motor 2 and heat transfer to the base 4, the inverter 5 can be housed in the case 3 having a compact structure.

〔Effect of the invention〕

According to the present invention, in an inverter-driven electric blower using an external fan-shaped motor, the drive motor is installed on the floor via a box-shaped case, and a power inverter for the motor is housed in the case. The inverter is cooled by blowing a part of the cooling air by the action of the external fan and by transferring heat from the case to the platform, so that the inverter can be installed integrally with a compact structure. Moreover, the effect of efficient cooling can be obtained.

[Brief explanation of drawings]

FIG. 1 is a partial longitudinal sectional view of an embodiment of the invention. 1...Blower, 2...Motor, 3...Case, 3
a... Bottom plate, 4... Base floor, 5... Inverter, 6
...Outside fan.

Claims (1)

[Claims] 1) The external fan-shaped motor that drives the blower is installed on the platform via a box-shaped case with a completely enclosed structure, and the power inverter for the motor is housed in the case, and the case An inverter-driven electric blower, characterized in that the inverter is cooled by blowing part of the cooling air and transferring heat from the case to the base.