JP2014234712A - Air compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain clogging of a filter on the side of an inlet port of an air compressor.SOLUTION: An air compressor comprises: a driving part 3; a compressed air generating part 5 driven by the driving part to compress air; an air tank part 11 for storing compressed air generated by the compressed air generating part 5; a body cover 17 for covering at least the driving part 3 and the compressed air generating part 5; and an exhaust fan 70 arranged on the inside of the cover 17 and rotated by the driving part 3. An inlet port 24 provided with a filter 25 of the compressed air generating part 5 is opposed to the non-exhaust side of the exhaust fan 70.

Description

  The present invention relates to an air compressor for supplying compressed air to an air tool or the like using compressed air as a power source.

  As a device that generates compressed air that serves as a power source for an air tool or the like, for example, an air compressor including a twin-barreled air tank disclosed in Patent Document 1 is known.

JP 2009-185648 A

  By the way, in the air compressor as shown in Patent Document 1 described above, the air discharged from the intake fan has a structure in which air flows into the compressed air generation unit from the intake port provided in the crankcase. The filter may be clogged with dust that enters from the inside. In that case, the filter needs to be replaced, and there is room for improvement in terms of reducing dust reaching the filter.

  This invention is made | formed in view of such a condition, and it aims at providing the air compressor which can suppress clogging of the filter by the side of the inlet port of an air compressor.

  The first aspect of the present invention is an air compressor. The air compressor includes a drive unit, a compressed air generation unit that compresses the air driven by the drive unit and sucked from an intake port, and an air tank for storing the compressed air generated by the compressed air generation unit And a cover that covers at least the drive unit and the compressed air generation unit, and a first fan that is disposed inside the cover and is driven to rotate by the drive unit, one side of the first fan The air intake is provided, and a shielding plate that overlaps a part of the fan in the axial direction of the first fan is provided on the other side of the first fan.

  In the first aspect, the intake port may be provided in a region of the shielding plate as viewed in the axial direction of the first fan.

  The said 1st aspect WHEREIN: The said shielding board is provided in the said cover, and it is good to shield a part of airflow sent from said 1st fan.

  In the first aspect, the shielding plate may be opposed to the intake port with the first fan interposed therebetween.

  In the first aspect, the shielding plate may cover substantially half of the outer diameter of the first fan as viewed in the axial direction of the first fan.

  In the first aspect, the shielding plate may cover all or part of the lower half without covering the upper half of the outer diameter of the first fan.

  The said 1st aspect WHEREIN: The said shielding board is good to have a collar part extended in an exhaust direction above.

  In the first aspect, a member on which a control circuit for controlling the operation of the drive unit is mounted may serve as the shielding plate.

  The said 1st aspect WHEREIN: It is good for the heat sink of the control circuit which controls operation | movement of the said drive part to serve as the said shielding board.

  In the first aspect, the exhaust-side vent hole of the cover may be provided at a position facing the first fan and at a position where air flow is not shielded by the shielding plate.

  In the first aspect, an intake fan that is rotationally driven by the drive unit may be provided in the cover and on the opposite side of the first fan across the compressed air generation unit.

  In the first aspect, the outer diameters of the intake fan and the first fan may be substantially the same.

  The second aspect of the present invention is also an air compressor. The air compressor includes a drive unit, a compressed air generation unit that is driven by the drive unit to compress air, an air tank unit that stores compressed air generated by the compressed air generation unit, and the drive And a cover that covers at least the compressed air generation unit and an intake fan that is disposed inside the cover and is driven to rotate by the drive unit, and an intake port provided with a filter of the compressed air generation unit includes the intake air A shielding plate for shielding a part of the air flow sent from the intake fan and passed through the compressed air generation unit is provided in the cover on the side opposite to the fan arrangement side.

  In the second aspect, the shielding plate may be opposed to the intake port.

  In the second aspect, a member on which a control circuit board for controlling the operation of the drive unit is mounted may also serve as the shielding plate.

  In the second aspect, a heat radiating plate of a control circuit board that controls the operation of the driving unit may also serve as the shielding plate.

  In the second aspect, the exhaust-side vent hole of the cover may be provided at a position where the airflow is not shielded by the shielding plate.

  In the first or second aspect, the height position of the shielding plate may be lower than the exhaust side ventilation hole of the cover, and the shielding plate may have a flange portion extending upward in the exhaust direction.

  It should be noted that any combination of the above-described constituent elements, and those obtained by converting the expression of the present invention between methods and systems are also effective as aspects of the present invention.

  According to the air compressor of the present invention, the clogging of the filter provided at the intake port can be reduced by disposing the intake port of the compressed air generating unit on the exhaust side.

The front sectional view showing one embodiment of the air compressor of the present invention. FIG. 3 is a front sectional view showing a flow of air from a fan in the embodiment. FIG. 3 is a cross-sectional plan view of the embodiment in which the cover is omitted and the periphery of the intake port of the compressed air generating section is taken as a cross section. The plane sectional view of the above-mentioned embodiment which omitted a cover and made a section of a compression part of a compressed air generation part. The left side view of the said embodiment which abbreviate | omitted the filter so that the cover and the control circuit part were abbreviate | omitted and the inlet port was visible. The left view of the said embodiment which abbreviate | omitted the cover. The right view of the cover in the said embodiment. The left view of the cover in the said embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component, member, process, etc. which are shown by each drawing, and the overlapping description is abbreviate | omitted suitably. In addition, the embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  1 to 8, the air compressor includes a compressor main body 1 and an air tank portion 11 disposed below the compressor main body 1. The compressed air main body 1 includes a driving unit 3 having an electric motor and the like. A control circuit unit 4 for controlling, a compressed air generating unit 5 having a crankcase 6, an intake fan (second fan) 60, an exhaust fan (first fan) 70, a main body cover 17 covering the compressed air main body 1, and the like are provided. doing.

  The air tank unit 11 stores the compressed air generated by the compressed air generation unit 5, and includes a pair of cylindrical air tanks 11 a and 11 b arranged in parallel along the longitudinal direction of the compressor body 1. Have. Support legs 29 are provided before and after each air tank 11a, 11b. The drive unit 3 and the compressed air generation unit 5 that is rotationally driven by the drive unit 3 are mounted and fixed on the pair of air tanks 11a and 11b, and the crankcase 6 is positioned at the approximate center in the longitudinal direction of the air tanks 11a and 11b.

  As shown in FIG. 3, the two air tanks 11 a and 11 b are communicated with each other via a communication pipe 22. The compressed air supplied into one air tank 11b passes through the communication pipe 22 and flows into the other air tank 11a, so that the pressures inside the two air tanks 11a and 11b are kept the same. Further, the drain and compressed air accumulated in the air tank portion 11 are discharged to the outside by a drain discharge device 21 screwed into the air tank 11a. A drain discharge port (not shown) is formed in the drain discharge device 21 and is opened and closed by manual operation of the drain cock 21a. When a drain discharge port (not shown) is opened, drains and compressed air in the two air tanks 11a and 11b are simultaneously discharged to the outside through the communication pipe 22 and a flow path inside the drain discharge device (not shown).

  The compressed air generation unit 5 includes a first-stage compression unit 7 and a second-stage compression unit 8 that are two compression mechanisms. The first-stage compression unit 7 and the second-stage compression unit 8 are arranged to face each other via the crankcase 6. An operation unit 18 having a main power switch 19 is provided on the air tank unit 11 adjacent to the second-stage compression unit 8.

  The crankcase 6 is provided with an intake port 24 for sucking external air (atmospheric pressure). The intake port 24 is covered with a filter 25 to prevent dust and the like from entering the crankcase 6. The filter 25 is fixed with screws through a presser plate 26.

  As shown in FIG. 4, the first stage compression section 7 has a cylinder 41a and a piston 42a, and the second stage compression section 8 has a cylinder 41b and a piston 42b. The rotational motion of the drive unit 3 is transmitted to the crankshaft 50 to rotate the low-pressure side crank arm and the high-pressure side crank arm. A low pressure side connecting rod 45a is automatically arranged on the outer periphery of the low pressure side crank arm via a bearing, and the low pressure side crank arm 41 is in contact with the low pressure side cylinder 41a by rotating eccentrically. Converted to reciprocating motion. Similarly, a high pressure side connecting rod 45b is rotatably disposed on the outer periphery of the high pressure side crank arm via a bearing. The high pressure side crank arm is eccentrically rotated to be installed in the high pressure side cylinder 41b. It is converted into a reciprocating motion of the high pressure side piston 42b.

  In the suction process in which the low pressure side piston 42a and the high pressure side piston 42b move downward from the top dead center to the bottom dead center in the low pressure side cylinder 41a and the high pressure side cylinder 41b, air flows into the low pressure side compression chamber 46a and the high pressure side compression chamber 46b. Sucked into. On the other hand, in the process in which the low pressure side piston 42a and the high pressure side piston 42b move upward from the bottom dead center to the top dead center in the low pressure side cylinder 41a and the high pressure side cylinder 41b, the low pressure side piston 42a and the high pressure side piston 42b The air in the compression chamber 46a and the high-pressure side compression chamber 46b is compressed to generate compressed air.

  The reciprocating motions of the low pressure side piston 42a of the first stage compression unit 7 and the high pressure side piston 42b of the second stage compression unit 8 are out of phase, and the first stage compression unit 7 is Inhale and compress external air. The compressed air is sent to the second stage compression unit 8 via the first stage discharge pipe 9. The second stage compression unit 8 further compresses the compressed air supplied from the first stage compression unit 7 and supplies the compressed air to the air tank 11 b via the second stage discharge pipe 10.

  A transport handle 20 is provided between the pair of cylindrical air tanks 11 a and 11 b arranged in parallel and at both ends in the longitudinal direction of the air tank portion 11.

  Further, pressure reducing valves 13a and 13b having pressure adjusting handles are provided to communicate with the air tanks 11a and 11b, respectively. The pressure adjusting handles of the pressure reducing valves 13 a and 13 b are located on both sides of the operation unit 18. Socket holders 14a and 14b are screwed into the pressure reducing valves 13a and 13b. Pressure gauges 15a and 15b are screwed onto the upper ends of the socket holders 14a and 14b. Compressed air outlets (air sockets) 16a and 16b are connected to the opposite sides of the socket holders 14a and 14b that are screwed with the pressure reducing valves 13a and 13b. The pressure gauges 15a and 15b can monitor the pressure in the vicinity of the compressed air outlets 16a and 16b. The pressure sensor 12 is screwed to the air tank 11b adjacent to the pressure reducing valve 13b.

  Here, the pressure reducing valves 13a and 13b maximize the compressed air outlets 16a and 16b side pressure regardless of the pressure on the inlet side (second-stage discharge pipe 10 side) of the compressed air to the air tank unit 11. Has a function to keep the pressure below a certain level. Accordingly, compressed air having a pressure equal to or lower than the maximum pressure is obtained at the compressed air outlets 16a and 16b regardless of the pressure in the air tank portion 11. Further, a pneumatic tool such as a nail driver is connected to each of the compressed air outlets 16a and 16b via a hose (not shown). And compressed air is supplied to a pneumatic tool from each compressed air outlet 16a, 16b.

  The main power switch 19 is provided to turn on / off the commercial AC power supplied to the compressor body 1 via the power cord 2. The commercial AC power supplied to the compressor body 1 is converted into direct current by an AC-DC conversion circuit or the like provided in the control circuit unit 4 and supplied to the control circuit board 4a in the control circuit unit 4 or the drive unit 3. Is done. As shown in FIG. 6, a switching element S, a diode group D, a capacitor C, an LSI, and the like are mounted on the control circuit board 4a. Further, the operation unit 18 has a display unit for displaying a pressure in the air tank unit 11 and a warning such as overload. Moreover, the motor of the drive part 3 consists of a DC motor, for example. The drive circuit of the DC motor is controlled by the control circuit unit 4. That is, on the basis of the pressure in the air tank unit 11 detected by the pressure sensor 12, the motor of the drive unit 3 is on / off controlled by the control circuit unit 4.

  Here, on one side {forward (the front and rear of the compressor body 1 is defined in FIG. 1)} of the compressed air generating unit 5, there is a driving unit 3 having a motor for driving the compressed air generating unit 5. Is provided. An intake fan 60 for cooling the drive unit 3 and the compressed air generation unit 5 is provided in front of the drive unit 3. The drive shaft of the intake fan 60 is the rotation shaft of the drive unit 3 and is coaxial with the crankshaft 50. The intake fan 60 sucks external air from the intake air vent 61 of the main body cover 17 shown in FIG. 7 and generates an air flow in a direction that passes through the drive unit 3 and the compressed air generation unit 5.

  On the other side (rear side) of the compressed air generation unit 5, the above-described intake port 24 for taking in external air into the crankcase 6 is provided. As shown in FIG. 5, the intake port 24 is disposed in the lower half with respect to the rotation axis of the drive unit 3, and the intake port 24 prevents dust and the like from entering the compressed air generating unit 5. The filter 25 is covered. An exhaust fan 70 is provided in the vicinity of the intake port 24 so as to discharge air in a direction opposite to the intake direction of the intake port 24. That is, the intake port 24 faces the opposite side (that is, the non-exhaust side) of the exhaust fan 70 to the air flow sending side. The drive shaft of the exhaust fan 70 is the rotation shaft of the drive unit 3 and is coaxial with the crankshaft 50. From the viewpoint of miniaturization, the intake fan 60 and the exhaust fan 70 have substantially the same outer diameter.

  In the vicinity of the exhaust fan 70, a control circuit unit 4 that functions as a shielding plate for shielding a part of the air flow sent from the exhaust fan 70 is provided. The control circuit unit 4 includes a control circuit board 4a (a board on which the control circuit is assembled) for controlling start / stop (on / off) of the motor of the driving unit 3 mounted on the heat radiating plate 48, and also serves as a shielding plate. The heat radiating plate 48 is fixedly supported by a frame 49 fixed to the tank portion 11. As shown in FIGS. 1 and 6, the control circuit unit 4 is positioned so as to hide the intake port 24 when viewed from the axial direction (A direction) of the exhaust fan 70 (viewed in the axial direction of the exhaust fan 70). Has been placed. Further, the control circuit unit 4 is arranged so as to hide approximately half (lower half) of the outer diameter of the exhaust fan 70 when viewed in the axial direction of the exhaust fan 70. That is, the control circuit unit 4 is disposed so as to cover almost half (the lower half) of the outer diameter of the exhaust fan 70. Further, as shown in FIG. 8, the exhaust side air vent 71 of the main body cover 17 is provided at a position facing the exhaust fan 70 and at a position where the airflow is not shielded by the heat radiating plate 48.

  The heat radiating plate 48 is opposed to the exhaust fan 70 in the front face, the flange 48b bent toward the side wall of the main body cover 17 from the upper portion of the facing part 48a at a substantially right angle (bent in the exhaust direction), and the facing part. And a bottom portion 48c bent toward the side wall of the main body cover 17 at a substantially right angle from the lower portion of 48a. When rainwater enters the main body cover 17 from the exhaust-side vent hole 71, the flange portion 48b is formed to be sufficiently longer than the bottom portion 48c so that water droplets are not directly applied to the control circuit board 4a. Note that gaps serving as air flow paths exist between the bottom 48c of the heat radiating plate 48 and the tank 11a and between the main body cover 17 and the tank 11a.

  In the above embodiment, when the main power switch 19 is turned on and the drive unit 3 is rotatingly driving the compressed air generating unit 5 by the control circuit unit 4, the air sucked from the intake port 24 through the filter 25 is The compressed air is compressed by the first-stage compression unit 7 and the second-stage compression unit 8 and stored in the air tank unit 11, and the stored compressed air is supplied to the compressed air outlets 16a and 16b via the pressure reducing valves 13a and 13b. Compressed air is supplied to the pneumatic tool.

  While the drive unit 3 is rotationally driven, the intake fan 60 and the exhaust fan 70 are rotated, and external air is sucked from the intake side vent hole 61 of FIG. 7 and discharged from the exhaust side vent hole 71 of FIG. In the cover 17, the air flow shown by the arrow in FIG. This air flow passes around the drive unit 3 and the compressed air generation unit 5 to cool them. Further, the air flow that has passed under the drive unit 3 and the compressed air generation unit 5 is shielded by the control circuit unit 4 that the air intake direction of the intake port 24 and the air delivery direction of the exhaust fan 70 are opposite to each other. Under the influence of acting as a plate, the airflow in the vicinity of the crankcase 6 where the intake port 24 is arranged flows in the vicinity of the crankcase 6 as an air flow upward (arrow Y). For this reason, the dust etc. which were suck | inhaled from the intake side ventilation hole 61 with external air are discharged | emitted by the airflow by the exhaust fan 70, and a dust etc. do not adhere to the filter 25 provided in the inlet port 24 easily.

  Further, after a part of the air flow sent from the exhaust fan 70 hits the control circuit unit 4 (heat radiating plate 48), it is mainly between the bottom 48c of the heat radiating plate 48 and the tank 11a, and between the main body cover 17 and the tank 11a. And is discharged to the outside of the cover 17.

  According to the present embodiment, the following effects can be achieved.

(1) The exhaust fan 70 is disposed in the vicinity of the intake port 24 of the compressed air generation unit 5, and dust or the like that enters the compressed air generation unit 5 during intake can be immediately exhausted. The clogging of the filter 25 provided in 24 can be reduced.

(2) Since the control circuit unit 4 is arranged in the vicinity so as to face the exhaust side of the exhaust fan 70, the air flow sent out by the exhaust fan 70 directly hits the control circuit unit 4, and the control circuit unit 4 It can be cooled efficiently. Furthermore, the control circuit unit 4 can be cooled more efficiently by disposing the heat radiating plate 48 of the control circuit unit 4 on the exhaust fan 70 side. Further, the area of the heat radiating plate 48 and the like of the control circuit unit 4 can be reduced.

(3) The control circuit unit 4 is configured to face the intake port 24 with the exhaust fan 70 interposed therebetween, and the heat radiating plate 48 serves as a shielding plate for the air flow sent out by the exhaust fan 70, so that the compressed air A vortex can be generated between the generation unit 5 and the control circuit unit 4 to remove dust and the like attached to the filter 25.

(4) Since the control circuit unit 4 covers almost half of the outer diameter of the exhaust fan 70, the control circuit unit 4 can be efficiently cooled without impairing the exhaust effect of the exhaust fan 70. Further, the cooling effect is greater when the control circuit unit 4 is arranged so as to cover all or part of the lower half of the outer diameter of the exhaust fan 70.

(5) The exhaust air vent 71 of the main body cover 17 is provided at a position facing the exhaust fan 70 and at a position where the air flow is not shielded by the control circuit unit 4 functioning as a shielding plate. The effect can be exhibited effectively.

(6) When the radiator plate 48 of the control circuit unit 4 integrally has the flange portion 48b extending in the exhaust direction on the upper side thereof, when rainwater enters from the exhaust side air vent 71 of the main body cover 17, The control circuit board 4a can be protected from being wetted by the flange portion 48b.

(7) By making the outer diameters of the intake fan 60 and the exhaust fan 70 substantially the same, the height direction of the air compressor can be reduced while ensuring the required air volume.

  The present invention has been described above by taking the embodiment as an example. However, it is understood by those skilled in the art that various modifications can be made to each component and each processing process of the embodiment within the scope of the claims. By the way. Hereinafter, modifications will be described.

  In the above embodiment, the case where both the intake fan 60 and the exhaust fan 70 are provided is illustrated, but either one of the fans may be omitted from the viewpoint of miniaturization and weight reduction. Moreover, although the case where the exhaust fan 70 is provided as a first fan (a fan provided at a position facing the intake port) is illustrated, the direction of the wind by the first fan is changed from the outside of the main body cover 17 to the compressed air generation unit 5. It is good also as a direction which draws in air. Even in this case, by increasing the wind speed in the vicinity of the intake port 24 of the crankcase 6, dust or the like can be made difficult to adhere to the filter 25 provided in the intake port 24.

  Further, a centrifugal fan (such as a turbo fan or a sirocco fan) that draws air in the direction from the outside of the main body cover 17 toward the compressed air generating unit 5 as a first fan at a position between the compressed air generating unit 5 and the control circuit unit 4. May be provided. By doing in this way, since the air sucked by the first fan flows to the outer side in the circumferential direction of the first fan on the opposite side of the intake port 24, the dust becomes difficult to approach the intake port 24, so that the dust is The filter 25 can be made difficult to adhere.

  Further, although the control circuit unit 4 shields the air flow sent out by the exhaust fan 70, the control circuit unit 4 is arranged in a part of the main body cover 17, a plate arranged in the air tank unit 11, or the crankcase 6. A plate or the like may serve as a shielding plate.

  Moreover, although the case where the inlet port 24 is arranged in the lower half of the rotation shaft of the drive unit 3 is illustrated, the inlet port 24 is sent out by the exhaust fan 70 when viewed from the direction A in FIG. If it exists in the position hidden by the part which plays the role as a shielding board which shields an airflow, it can arrange | position arbitrarily.

DESCRIPTION OF SYMBOLS 1 Compressor main body 2 Power supply cord 3 Drive part 4 Control circuit part 4a Control circuit board 5 Compressed air generation part 6 Crankcase
7 First-stage compression section 8 Second-stage compression section 9 First-stage discharge pipe 10 Second-stage discharge pipe 11 Air tank sections 11a and 11b Air tank 12 Pressure sensors 13a and 13b Pressure reducing valves 14a and 14b Socket holders 15a and 15b Pressure gauge 16a 16b Compressed air outlet 17 Main body cover 18 Operation section 19 Main power switch 20 Transport handle 21 Drain discharge device 21a Drain cock 22 Communication pipe 24 Inlet 25 Filter 48 Heat sink 48a Confronting section 48b Hook section 50 Crankshaft 60 Intake fan ( Second fan)
61 Intake air vent 70 Exhaust fan (first fan)
71 Exhaust air vent

Claims (18)

A drive unit;
A compressed air generating section that is driven by the driving section and compresses the air sucked from the inlet;
An air tank unit for storing compressed air generated by the compressed air generation unit;
A cover covering at least the drive unit and the compressed air generation unit;
A first fan disposed inside the cover and driven to rotate by the drive unit;
The intake port is provided on one side of the first fan, and a shielding plate is provided on the other side of the first fan so as to overlap a part of the fan in the axial direction of the first fan. air compressor.   2. The air compressor according to claim 1, wherein the intake port is provided in a region of the shielding plate as viewed in the axial direction of the first fan.   3. The air compressor according to claim 1, wherein the shielding plate is provided in the cover and shields a part of the air flow sent from the first fan. 4.   The air compressor according to any one of claims 1 to 3, wherein the shielding plate is opposed to the intake port with the first fan interposed therebetween.   5. The air compressor according to claim 1, wherein the shielding plate hides substantially half of the outer diameter of the first fan as viewed in the axial direction of the first fan. 6. .   5. The air compression according to claim 1, wherein the shielding plate hides all or a part of the lower half without covering the upper half of the outer diameter of the first fan. 6. Machine.   The air compressor according to claim 6, wherein the shielding plate has a flange portion extending upward in an exhaust direction.   The air compressor according to any one of claims 1 to 7, wherein a member on which a control circuit for controlling the operation of the driving unit is also used as the shielding plate.   The air compressor according to any one of claims 1 to 7, wherein a heat radiating plate of a control circuit that controls the operation of the driving unit also serves as the shielding plate.   The exhaust-side vent hole of the cover is provided at a position facing the first fan and at a position where an air flow is not shielded by the shielding plate. The air compressor according to item.   11. The intake fan that is rotationally driven by the drive unit is provided in the cover and on the opposite side of the first fan across the compressed air generation unit. The air compressor as described in any one.   The air compressor according to claim 11, wherein outer diameters of the intake fan and the first fan are substantially the same. A drive unit;
A compressed air generating section that is driven by the driving section to compress air;
An air tank unit for storing compressed air generated by the compressed air generation unit;
A cover covering at least the drive unit and the compressed air generation unit;
An intake fan disposed inside the cover and driven to rotate by the drive unit;
An intake port provided with a filter of the compressed air generation unit is on the opposite side of the arrangement side of the intake fan;
An air compressor characterized in that a shielding plate for shielding a part of the air flow sent from the intake fan and passed through the compressed air generation unit is provided in the cover.   The air compressor according to claim 13, wherein the shielding plate faces the intake port.   The air compressor according to claim 13 or 14, wherein a member on which a control circuit for controlling the operation of the drive unit is mounted also serves as the shielding plate.   The air compressor according to claim 13 or 14, wherein a heat radiating plate of a control circuit that controls the operation of the driving unit also serves as the shielding plate.   The air compressor according to any one of claims 13 to 16, wherein an exhaust side vent hole of the cover is provided at a position where an air flow is not shielded by the shielding plate.   The height position of the shielding plate is at a position lower than the exhaust side vent hole of the cover, and the shielding plate has a flange portion extending upward in the exhaust direction. The air compressor according to one item.

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