JP2004218514A - Air compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable drain exhaust pipes to be formed at the bottom of an air tank to cool effectively the air tank and other parts by a fan for cooling the compressor. <P>SOLUTION: A housing 2a of an electric motor 2 which is integrated with the compressor 3 is mounted on a base 10, a coupling bar 13 is mounted on the housing 2a, a cooling plate 15 for a board is arranged parallel to an axial line of the electric motor 2, the air tank 4 is supported by the coupling bar 13 and the cooling plate 15 in such a way that a longitudinal axis of the air tank 4 is parallel to the axial line of the electric motor 2 and is made to be horizontally offset, the pipes for coupling parts such as a pressure reducing pressure control valve 5 or the like are mounted via the coupling bar 13 so as to be parallel to the axial line of the electric motor 2, and an upper portion of a cover 17 whose lower end edge engages with the base 10 is mounted by being sandwiched between the coupling bar 13 and a grip 14. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a portable air compressor in which a compressor driven by an electric motor and an air tank for storing compressed air are housed in a cover, and a portable grip is formed.
[0002]
[Prior art]
For example, in a portable compressor that compresses air by driving a compressor with an electric motor, the electric motor and the compressor are installed in parallel on a base that can be installed on a floor or the like, A belt is wound between the electric motor and each pulley mounted on the drive shaft of the compressor, and the compressor is cooled by a fan formed on the pulley on the compressor side. Further, an air tank is mounted on the electric motor and the compressor via a stay with a longitudinal axis directed in a direction orthogonal to the motor axis. A transport grip is attached to the air tank so that the compressor can be gripped by hand and transported. (For example, see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. Sho 63-60089 [0004]
[Problems to be solved by the invention]
In the above-mentioned conventional air compressor, the air tank is disposed right above the electric motor and the compressor, so that a drain cock pipe for discharging the drain accumulated in the air tank is formed at the bottom of the air tank. In this case, a pipe is connected to the side of the air tank, so that a pipe opened at the bottom of the air tank needs to be arranged in the air tank. Furthermore, since the air tank is formed perpendicular to the drive shaft of the compressor, the air flow that cools the compressor by the fan formed on the pulley attached to the drive shaft of the compressor efficiently cools the air tank. There was a problem that cooling could not be performed, and thus the compressed air stored in the air tank could not be cooled, and dripping water vapor flowed into the pneumatic tool, causing a failure of the tool.
[0005]
The present invention can solve the above-mentioned conventional problems, and can form a drain discharge pipe for discharging the drain collected in the air tank at the bottom of the air tank. It is an object of the present invention to provide a portable air compressor that can be efficiently cooled by a fan that cools the air.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, an air compressor according to the present invention is configured such that a compressor is integrally formed at one end side and an electric motor having a cooling fan formed at the end is mounted on a base and mounted on a housing of the electric motor. A connecting bar is attached, and one side of the air tank is attached by the connecting bar so that the longitudinal axis of the air tank is parallel to the axial direction of the electric motor and offset horizontally. Is supported by a cooling plate for a substrate arranged so as to be parallel to the axis of the motor, and components such as a pressure reducing valve, a pressure switch, and a coupler are connected to the opposite side of the offset side of the air tank through the connection bar. The pipe connecting the parts is arranged and attached so as to be parallel to the axis of the electric motor, and further, the upper part of the cover whose lower edge is engaged with the base is attached. Serial is held between the connecting bar and the grip, characterized in that attached.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples shown in the drawings. FIG. 1 shows an air compressor 1 including an electric motor 2 driven by inverter control and a two-stage compressor 3 driven by the electric motor 2 as an example of a portable type air compressor. The compressor 3 includes a first-stage compressor driven by the electric motor 2 for sucking and compressing the atmosphere and a second-stage compressor for further compressing the air compressed by the first-stage compressor. The compressor is provided so that the compressed air compressed to a high pressure by the second-stage compressor is stored in the air tank 4. The high-pressure compressed air stored in the air tank 4 is adjusted to a predetermined pressure via a pressure reducing valve 5 so that it can be supplied to a pneumatic tool or the like driven by the compressed air from a coupler 7 formed in an air outlet 6. I have to.
[0008]
The compressor 3 is integrally formed with a housing 2a of the electric motor 2, and the cylinders 3a and 3b constituting the first and second stages of the compressor are horizontally opposed from the housing 2a. Are located. Cooling for generating cooling air for cooling the cylinders 3a and 3b of the compressor 3 is provided on the output shaft 8 protruding from the end of the housing 2a of the electric motor 2 on the side where the compressor 3 is formed. A fan 9 is formed so that cooling air generated by the cooling fan 9 can flow along the axial direction of the housing 2a. The housing 2a of the electric motor 2 is mounted on an upper surface of a base 10 formed of a material such as resin through a resilient support member 11 for absorbing vibration.
[0009]
A connection bar 13 is mounted on an upper portion of the housing 2a of the electric motor 2 via a shock absorbing member 12 for absorbing vibrations of upper components such as the air tank 4 and the like. A grip 14 for transporting the machine 1 is attached. Further, one side of the air tank 4 is supported by the side of the connection bar 13, and the other side of the air tank 4 is provided with a cooling plate 15 for inverter control whose lower end is supported by the base 10. I support them. Further, components such as a pressure reducing valve 5 for adjusting pressure, a coupler 7 for supplying compressed air to a pneumatic tool and the like, and a pipe connecting these components are attached to the connection bar 13. ing. The pressure reducing valve 5, the coupler 7, and the piping connecting them are arranged in parallel with the axial direction of the electric motor 2 and the air tank 4, and the cooling air generated by the cooling fan 9 is The flow is not obstructed.
[0010]
As shown in FIGS. 2 and 3, the air tank 4 is arranged such that the longitudinal axis of the air tank 4 is parallel to the axis of the electric motor 2, and both axes are horizontally offset. In addition, the cooling air generated by the cooling fan 9 formed on the output shaft 8 of the electric motor 2 to cool the compressor 3 can flow along the longitudinal direction of the air tank 4. A space is formed below the air tank by horizontally offsetting the electric motor 2 and the air tank 4, and a drain discharge pipe 16 for discharging drain collected at the bottom of the air tank 4 is disposed in this space. ing. By offsetting the air tank 4 with respect to the electric motor 2 so that the drain discharge pipe 16 can be disposed directly below the air tank 4, the drain discharge pipe and piping for opening to the bottom in the air tank 4 are unnecessary. Become.
[0011]
A cover 17 is formed so as to cover components such as the electric motor 2, the compressor 3, the air tank 4, the pressure reducing valve 5, and the coupler 7 which are arranged on the upper surface of the base 10. As shown in FIG. 4, there is formed a locking piece 18 which faces downward, and the locking piece 18 is formed upward on the outer peripheral edge of the base 10 which also serves as a lower cover. The lower portion of the cover 17 is engaged with the base 10 by being engaged with the base 10, and a part of the upper portion of the cover 17 is attached by being clamped between the upper end portion of the connection bar 13 and the grip 14. I have. A window 19 for introducing outside air into the cover 17 by the cooling fan 9 is formed in the cover 17 so as to face the cooling fan 9, and an operation part 5 a of the pressure reducing valve 5 and a plug of a pneumatic tool are connected. An opening 20 is formed for projecting the coupler 7 to the outside of the cover 17.
[0012]
A cooling plate 15 for inverter control of the electric motor 2 has a lower portion fixedly supported by the base 10, and is disposed inside the cover 17 in parallel with the axial direction of the air tank 4 and the electric motor 2. 17 is engaged with and supported by the upper edge of the cooling plate 15, and cooling air generated by the cooling fan 9 formed at the end of the output shaft 8 of the electric motor 2 flows along the cooling plate 15. The cooling plate 15 is arranged so as to efficiently cool the cooling plate 15 and not to block the flow of cooling air to other components.
[0013]
Support legs 22 are formed on the lower surface of the base 9 so that the air compressor 1 can be mounted on a floor or the like. Further, in the above embodiment, components such as the pressure reducing valve 5, the coupler 7 and the pressure switch are attached to the connecting bar 13, but these pressure reducing valves are mounted on the side surface of the air tank 4 supported by the connecting bar 13. Components such as the valve 5, the coupler 7, and the pressure switch may be attached. Further, the connecting bar 13 may be configured to be divided into a lower portion for attaching and fixing the air tank 4 to the housing 2a of the electric motor 2 and an upper portion for attaching and fixing the grip 14 to the air tank 4 so as to be independent.
[0014]
【The invention's effect】
As described above, according to the present invention, the air tank is disposed at the upper part of the housing of the electric motor such that the longitudinal axis of the air tank is parallel to the axial direction of the electric motor and offset horizontally. In addition, the drain discharge pipe can be arranged directly below the air tank, and the number of pipes opened from the drain discharge pipe to the bottom in the air tank can be reduced, thereby making it possible to reduce the cost of the air compressor.
[0015]
Further, the longitudinal axis of the air tank and the cooling plate for the substrate are arranged in parallel to the axis of the electric motor, and cooling air generated by a cooling fan formed at the output shaft end of the electric motor is applied to the air tank and the cooling plate. By flowing along, the air tank and the cooling plate are efficiently cooled. In addition, since the flow of the cooling air is not blocked, the electric motor and other parts are effectively cooled.
[0016]
Through the connecting bar attached to the housing of the electric motor, the air tank and the components such as the pressure reducing valve and the coupler and the piping connecting these components are attached, and the cover covering these mechanisms and components is connected to the connecting bar. The air compressor is held between the grip and the grip that is gripped when transporting it.Therefore, the load is not applied to the cover during operation and transport, so the external shape is simply maintained, high temperature, and the rotating part is empty. Only the function of protecting the worker is required, and the structure and shape can be simply designed without requiring strength, so that the cost of the air compressor can be reduced.
[Brief description of the drawings]
FIG. 1 is a side view in which a part of an air compressor according to an embodiment of the present invention is sectioned. FIG. 2 is a plan view of the same air compressor as in FIG. 1 except for a cover. FIG. FIG. 4 is a cross-sectional view taken along a line BB in FIG. 1; FIG. 5 is a side view in a direction opposite to FIG.
DESCRIPTION OF SYMBOLS 1 Air compressor 2 Electric motor 3 Compressor 4 Air tank 9 Cooling fan 10 Base 11 Elastic support member 12 Buffer member 13 Connecting bar 14 Grip 15 Cooling plate

Claims (1)

An electric motor having a compressor integrally formed at one end and a cooling fan formed at the end is mounted on a base, a connecting bar is mounted on a housing of the electric motor, and the connecting bar is connected to the air tank by the connecting bar. For the board, the side of the air tank is mounted so that the longitudinal axis of the air tank is parallel to the axial direction of the electric motor and offset horizontally, and the opposite side surface of the air tank is arranged to be parallel to the axis of the motor. The piping connecting these parts to the side opposite to the offset side of the air tank through the connecting bar is parallel to the axis of the electric motor. And the upper end of the cover whose lower edge is engaged with the base is clamped between the connecting bar and the grip. Air compressor, characterized in that the.

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