EP2853745A1 - Air compressor - Google Patents
Air compressor Download PDFInfo
- Publication number
- EP2853745A1 EP2853745A1 EP14181256.0A EP14181256A EP2853745A1 EP 2853745 A1 EP2853745 A1 EP 2853745A1 EP 14181256 A EP14181256 A EP 14181256A EP 2853745 A1 EP2853745 A1 EP 2853745A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- cooling fan
- motor
- air stream
- air compressor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
- F04D25/082—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provision for cooling the motor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/06—Mobile combinations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/06—Cooling; Heating; Prevention of freezing
- F04B39/066—Cooling by ventilation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/5806—Cooling the drive system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
- F04D29/584—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps cooling or heating the machine
Definitions
- the present invention relates to an air compressor suitable for generation of compressed air required to drive a pneumatic tool such as a nailing machine.
- an air compressor for driving the pneumatic tool and the like is configured to convert a rotational motion of a rotational shaft of a driving part such as a motor into a reciprocal motion of a piston in a cylinder through a crankshaft of a compression part and to compress air sucked from a suction valve of the cylinder by the reciprocal motion of the piston.
- the compressed air compressed in the cylinder is discharged from an exhaust valve of the cylinder to an air tank through a pipe and is stored in the air tank.
- a multistage reciprocating compressor of increasing a pressure in a stepwise manner When compressing the gas to a high pressure, a multistage reciprocating compressor of increasing a pressure in a stepwise manner has been generally used.
- the high-pressure compressed air stored in the air tank is adjusted to an appropriate pressure by a decompression valve attached to the air tank and is then supplied to the pneumatic tool and the like through an air hose.
- the air compressor is disclosed in JP-A-2013-40586 .
- the air compressor has a plurality of heat generation parts in which the temperature thereof is high in accordance with using the motor, the compression part (particularly, the cylinder), the control circuit and the like.
- the heat generation parts should be thus arranged at spaced positions. Therefore, it is necessary to securely guide the cooling air generated by the cooling fan attached to the rotational shaft of the motor to the respective heat generation parts.
- the heat generation part may be positioned at a place that is difficult to be cooled by the general cooling fan, due to a layout, which is a problem to be solved with respect to the cooling efficiency.
- an air compressor comprising: an air tank configured to store therein compressed air; a compression part configured to compress air sucked from an outside and to supply the air to the air tank; a motor configured to drive the compression part; a cooling fan provided at one end-side of a rotational shaft of the motor, and a cover configured to cover at least the compression part, the motor and the cooling fan, characterized in that the cooling fan comprises a ring part provided at an outer peripheral part thereof and having a substantially cylindrical shape, and the cooling fan is configured to change a direction of an air stream by the ring part.
- any combination of the above-described elements, and a method, a system and the like converted from the expressions of the present invention are also effective as the aspects of the present invention.
- Fig. 1 is a perspective view of an air compressor 1 according to a first illustrative embodiment of the present invention.
- Fig. 2 is a plan view of the air compressor 1 in which a cover 26 is a cross-sectional surface. Incidentally, in Fig. 2 , gripping parts 31a, 31b are not shown.
- Fig. 3 is a plan sectional view of the air compressor 1.
- Fig. 4 is a IV-IV sectional view of Fig. 2 .
- Fig. 5 is a front sectional view of the air compressor 1.
- Fig. 6 is a first perspective view from below of the cover 26 of the air compressor 1.
- Fig. 7 is a second perspective view from below of the cover 26 of the air compressor 1.
- Fig. 1 is a perspective view of an air compressor 1 according to a first illustrative embodiment of the present invention.
- Fig. 2 is a plan view of the air compressor 1 in which a cover 26 is a cross-sectional surface. Incidentally
- Fig. 8 is an VIII-VIII sectional view of Fig. 4 relating to the cover 26 of the air compressor 1.
- Fig. 9 is a IX-IX sectional view of Fig. 4 .
- Fig. 10 is a perspective view of a cooling fan 8b of the air compressor 1.
- Fig. 11 is a perspective view of a cooling fan 8a of the air compressor 1.
- Fig. 12 is a perspective view of a seventh baffle plate 306 of the air compressor 1.
- the air compressor 1 includes: a pair of air tanks 2a, 2b arranged to be parallel at a predetermined interval therebetween and storing therein compressed air; a compression part 3 for compressing air sucked from an outside and supplying the compressed air to the air tanks 2a, 2b; and a motor 4, which is connected to the compression part 3, for driving the compression part 3.
- the motor 4 and the compression part 3 are arranged above the pair of air tanks 2a, 2b such that an axis direction of the motor 4 is substantially perpendicular to a longitudinal direction of the air tanks 2a, 2b.
- a rotational shaft 5 of the motor 4 penetrates the compression part 3, and a cooling fan 8a (a first cooling fan) is provided at a motor-side end portion of the rotational shaft 5 of the motor 4 and a cooling fan 8b (a second cooling fan) is provided at a non-motor-side end portion of the rotational shaft 5 of the motor 4.
- the cooling fans 8a, 8b are rotated integrally with the motor 4.
- decompression valves 9a, 9b, pressure meters 10a, 10b for displaying a pressure of the decompressed compressed air and couplers 11a, 11b functioning as outlets of the compressed air are provided in the vicinity of the compression part 3 in the longitudinal direction of the pair of air tanks 2a, 2b.
- An operator connects the couplers 11a, 11b and a pneumatic tool (not shown) such as a nailing machine by an air hose for high pressure (not shown) and operates the pneumatic tool by using the compressed air to appropriately perform an operation.
- the air tanks 2a, 2b are provided with a safety valve 12 and a drain discharge device 13.
- the safety valve 12 is configured to discharge a part of the compressed air to the outside when a pressure is abnormally increased.
- the drain discharge device 13 has an operation part 14. When the operation part 14 is operated, the compressed air and moisture in the air tanks 2a, 2b can be appropriately discharged to the outside.
- the compression part 3 is provided therein with a crank mechanism.
- a rotational motion of the rotational shaft 5 of the motor 4 is converted into reciprocal motions of a first piston 34a and a second piston 34b through a first connecting rod 33a and a second connecting rod 33b, respectively.
- the first piston 34a is accommodated in a first cylinder 15a and a first cylinder head 16a.
- the second piston 34b is accommodated in a second cylinder 15b and a second cylinder head 16b.
- the first cylinder 15a and the second cylinder 15b are horizontally opposed to each other with the rotational shaft 5 of the motor 4 being interposed therebetween.
- the first cylinder 15a and the second cylinder 15b are arranged to be substantially parallel with the air tanks 2a, 2b, respectively.
- the air is first compressed by the second cylinder 15b (a low pressure-side cylinder) and the air compressed by the second cylinder 15b is supplied to the first cylinder 15a (a high pressure-side cylinder) through a piping 19a (refer to Fig. 2 ).
- the air further compressed by the first cylinder 15a is supplied to the air tank 2a through a piping 19b.
- the air tanks 2a, 2b are connected to each other by a connection pipe 20, so that the pressures of the air tanks 2a, 2b are uniform.
- a control circuit 21 (a control circuit board) for driving the motor 4 is accommodated in a case 22.
- the control circuit 21 is arranged to face the cooling fan 8b at the non-motor-side of the compression part 3.
- the control circuit 21 is fixed to the air tank 2a.
- the motor 4, which is a DC brushless motor, has a stator coil 23, a rotor 24 arranged in the stator coil 23 and a Hall element board 25 (refer to Fig. 2 ) for detecting a rotating position of the rotor 24.
- the motor 4 is inverter-controlled by the control circuit 21.
- the control circuit 21 includes a heat generation component 204 (refer to Fig. 3 ) such as a semiconductor switching element for inverter control.
- a surface of the case 22 on which the heat generation component 204 is attached is configured as a heat generation surface 203, from which a heat is to be radiated or which is to be cooled.
- a cover 26 for covering the components of the air compressor such as the compression part 3, the motor 4, the control circuit 21 and the like is arranged above the air tanks 2a, 2b and is fixed to the air tanks 2a, 2b. Both end portions of the air tanks 2a, 2b in the longitudinal direction are provided with gripping parts 31a, 31 b for carrying the air compressor 1.
- the cover 26 is provided with an operation panel 26 having a power supply switch (not shown) for operating the air compressor 1 and the like.
- the cover 26 is provided with ventilating windows 29a, 29b (refer to Figs. 6 and 7 ) on wall surfaces facing the cooling fans 8a, 8b.
- a cover 30 (refer to Fig.
- the air tanks 2a, 2b are provided with leg parts 32 for preventing the air tanks 2a, 2b from directly contacting a ground to protect the air tanks 2a, 2b.
- the motor 4 is alternately applied with a compression load upon compression of the air by the reciprocal motions of the first piston 34a and the second piston 34b. For this reason, load currents are generated in the stator coil 23 and the control circuit 21, so that temperatures of the stator coil 23 and the control circuit 21 are increased by Joule heats accompanied by the load currents. Also, temperatures of the first cylinder 15a, the first cylinder head 16a, the second cylinder 15b and the second cylinder head 16b are increased by compression heat of the compressed air. Temperatures of the pipings 19a, 19b and the air tanks 2a, 2b are also increased because the compressed air whose temperature is increased by the compression heat flows therein.
- a generated air stream has a tendency to flow in an outer peripheral direction due to a high centrifugal force thereof. Therefore, it is difficult to promote the air stream in the adjacent motor, and thus the heat is likely to be accumulated in the motor.
- a configuration for improving cooling performance of the motor 4 will be described.
- the cooling fan 8a has outer blades 104 and inner blades 105.
- the outer blades 104 and the inner blades 105 are connected to each other by a cylindrical partition part (cylindrical part) 102.
- the partition part 102 extends in a direction along the rotational shaft of the motor 4.
- An attaching part 103 is formed at a further inner side of the inner blades 105.
- the cooling fan 8a can be attached to the rotational shaft 5 of the motor 4 by the attaching part 103.
- the inner blades 105 are formed integrally with the partition part 102 and the attaching part 103.
- the inner blades 105 are formed into a curved plate shape extending substantially parallel with the rotational shaft 5 of the motor 4, a so-called centrifugal type.
- the cooling fan 8a has a through-hole, which is formed by the adjacent inner blades 105, partition part 102 and attaching part 103.
- the through-hole is formed such that an opening area of a non-motor-side opening 107 is smaller than an opening area of a motor-side opening 106 at an opposite side (refer to Fig. 3 ).
- the outer blades 104 are formed into a curved shape extending obliquely relative to the direction along the rotational shaft 5 of the motor 4, a so-called axial flow type. As shown in Fig.
- an outer diameter D2 of the outer blades 104 is set to be larger than an outer diameter D1 of the motor 4.
- the cover 26 is formed with the ventilating window 29a facing the cooling fan 8a.
- a central portion of the ventilating window 29a is formed with a shield plate 101 (refer to Figs. 7 and 8 ) facing the inner blades 105 and serving as a shield part.
- the cooling fan 8a When the motor 4 is operated, the cooling fan 8a is rotated to generate an air stream. That is, the exterior air is sucked from an outside through the ventilating window 29a by the outer blades 104, and an air stream CA1 flowing towards the first cylinder 15a, the first cylinder head 16a, the second cylinder 15b and the second cylinder head 16b, as shown in Fig. 3 , is generated. Also, a part of the air stream generated by the outer blades 104 flows towards the stator coil 23, like an air stream CA2. At this time, by a negative pressure P1 additionally generated by the inner blades 105, the air in the vicinity of the stator coil 23 is sucked to the inner blades 105, like an air stream CA3.
- the air sucked to the inner blades 105 is enabled to flow out from the motor-side opening 106 towards the non-motor-side opening 107 by a negative pressure P2 generated by the outer blades 104, and is then sucked to the outer blades 104, like an air stream CA4. Thereafter, the air sucked to the outer blades 104 like the air stream CA4 is enabled to flow out together with the air stream CA1. As shown in Fig. 4 , the cooling wind having completed the cooling is discharged to the outside of the cover 30 through between the air tanks 2a, 2b.
- the air stream generated by the inner blades 105 is restrained by a cylindrical inner surface of the partition part 102 and is securely enabled to flow in a direction along a rotational shaft of the cooling fan 8a). Therefore, a synergetic effect with the air streams CA1, CA2 of the outer blades 104 can be exhibited, and it is possible to generate a high flow rate in the vicinity of the stator coil 23, in which the air stream is stagnant in the related art. According thereto, it is possible to effectively suppress the temperature increase of the stator coil 23.
- the rotational shaft 5 of the motor 4 is alternately applied with the compression load upon the compression of the air in the first cylinder 15a and the second cylinder 15b, so that a rotational variation is generated.
- a distortion vibration due to the rotational variation is generated for the cooling fan 8a.
- the attaching part 103 and the partition part 102 are strongly connected using the plurality of inner blades 105. According thereto, it is possible to disperse and reduce the stress resulting from the distortion vibration, thereby increasing the strength and reliability of the cooling fan 8a.
- the inner blades 105 also serve as a connection part (a frame) connecting the partition part 102 and the attaching part 103 each other, it is not necessary to separately form a connection part, which does not contribute to the air stream, so that the structure is efficient. Incidentally, by increasing the number of the inner blades 105, it is possible to improve the performance of the inner blades 105 as a fan and to improve the connection strength of the partition part 102 and the attaching part 103.
- the cooling fan 8a has a difference in the opening area between the non-motor-side opening 107 and the motor-side opening 106. According thereto, it is easy to control the flowing direction of the air stream generated by the inner blades 105. That is, it is possible to appropriately control the flowing direction of the air stream generated by the inner blades 105 by appropriately adjusting an opening area ratio between the non-motor-side opening 107 and the motor-side opening 106.
- the outer blades 104 suck the air from the non-motor-side (the outside of the cover 26) and enable the air stream to flow out towards the motor 4 and the compression part 3. Therefore, it is possible to suck a large amount of the exterior air having a temperature lower than the temperature in the cover 26 into the cover 26 and to extensively cool the motor 4, the compression part 3 and the like.
- the shield plate 101 since the shield plate 101 is provided, the negative pressure P2 between the cooling fan 8a and the shield plate 101 by the action of the outer blades 104 is enhanced. According thereto, it is possible to further promote the air streams CA3, CA4, thereby considerably improving the cooling efficiency. That is, it is possible to enable the air in the vicinity of the motor 4, which is sucked to the central part of the cooling fan 8a by the negative pressure (suction) by the inner blades 105, to smoothly flow towards the non-motor-side of the inner blades 105 and to further improve the cooling effect in the vicinity of the motor by the synergetic effect of the negative pressures of the outer blades 104 and the inner blades 105.
- the outer diameter D2 of the outer blades 104 is set to be larger than the outer diameter D1 of the motor 4. According thereto, a part of the air stream generated by the outer blades 104 is directly supplied to the compression part 3 without via the motor 4. As a result, it is possible to improve the cooling efficiency of the compression part 3.
- the air volume by the outer blades 104 is set to be larger than the air volume enabled to flow through the inner side of the partition part 102 by the inner blades 105. According thereto, it is easy to enable a part of the air stream, which is generated by the inner blades 105 mainly generating the air stream in the vicinity of the motor 4, to flow together with the air stream generated by the outer blades 104. Therefore, it is possible to securely supply the air stream after the cooling of the motor to the compression part 3 and to finally discharge the air stream to the outside of the cover. Thus, it is possible to exclude the bad influence on the cooling performance, which is caused as the heat is accumulated in the vicinity of the motor 4, thereby improving the cooling performance.
- the air compressor has a plurality of heat generation parts in which the temperature thereof is high in accordance with using the motor, the compression part (particularly, the cylinder), the control circuit and the like.
- the heat generation parts should be arranged at spaced positions. Therefore, it is necessary to securely guide the cooling air generated by the cooling fan attached to the rotational shaft of the motor to the respective heat generation parts.
- the heat generation part may be positioned at a place that is difficult to be cooled by the general cooling fan, due to a layout, which is a problem to be solved with respect to the cooling efficiency. Regarding this problem, a configuration for improving the cooling efficiency will be described.
- the case 22 and the control circuit 21 are arranged to face the cooling fan 8b that is attached to the end portion of the non-motor-side of the rotational shaft 5 of the motor 4.
- the heat generation surface 203 of the accommodated control circuit 21, on which the heat generation component 204 is mounted faces the cooling fan 8b.
- the heat generation component 204 faces an outer peripheral part (a ring part 201 that will be described later) of the cooling fan 8b with the heat generation surface 203 being interposed therebetween.
- the heat generation component 204 is an IGBT (insulated gate bipolar transistor), a diode bridge, an IPM (intelligent power module) and the like.
- the cooling fan 8b has a back plate 202 serving as a plate shape part formed on a flat plate, a normal line of which is set to a direction along the rotational shaft 5 of the motor 4. Blades 200 extending substantially parallel with the rotational shaft 5 of the motor 4 from an inner side of the back plate 202 towards an outer periphery thereof are centrifugally formed on the back plate 202. An attaching part 205 is formed at an inner side of the blades 200.
- the cooling fan 8b can be attached to the rotational shaft 5 of the motor 4 by the attaching part 205.
- the outer peripheral end of the cooling fan 8b is formed with the ring part 201.
- the ring part 201 has a cylindrical shape substantially parallel with the rotational shaft 5 of the motor 4.
- the ring part 201 extends from the back plate 202 towards the heat generation surface 203.
- the ring part 201 and the attaching part 205 are connected and integrated over an entire circumference by the back plate 202.
- the back plate 202 entirely closes the motor-side between the ring part 201 and the attaching part 205.
- a fifth baffle plate 304 (a baffle wall part), a sixth baffle plate 305 (a baffle wall part) and a seventh baffle plate 306 (a baffle wall part) are provided in the vicinity of the cooling fan 8b.
- the fifth baffle plate 304 and the sixth baffle plate 305 are formed as ribs hanging from the cover 26.
- the seventh baffle plate 306 shown as a unitary member in Fig. 12 is attached to the case 22 by a screw material.
- the seventh baffle plate 306 is formed from the case 22 towards the non-motor-side of the second cylinder 15b, as shown in Fig. 2 .
- the fifth baffle plate 304 hangs from the cover 26 towards the case 22.
- the fifth baffle plate 304 is formed with an opening 207 (a notched portion) having a diameter that is smaller than a diameter D3 (refer to Fig. 4 ) of the cooling fan 8b (refer to Figs. 4 and 6 and the like).
- the sixth baffle plate 305 is formed integrally with the fifth baffle plate 304 and is smoothly formed from the fifth baffle plate 304 towards the non-motor-side of the first cylinder 15a.
- a wall surface of the cover 26 facing the cooling fan 8b is formed with the ventilating window 29b.
- the exterior air is sucked from the outside through the ventilating window 29b by the cooling fan 8b, like an air stream CA10, and is guided to the central part of the cooling fan 8b by the opening 207.
- the air stream CA10 flows towards the outer periphery of the cooling fan 8b along the back plate 202, like an air stream CA11. Then, as shown in Fig.
- the air stream CA11 is deflected (a flowing direction thereof is changed) by the ring part 201 such that the flowing direction of the air stream CA11 closes to parallel with the suction direction of the air stream CA10 by the cooling fan 8b, flows towards and collides with the heat generation surface 203 (a first heat generation part) and further flows radially from the cooling fan 8b along the heat generation surface 203.
- a part of the air stream CA11 is guided towards the non-motor-sides (a second heat generation part) of the first cylinder 15a and the second cylinder 15b by the fifth baffle plate 304, the sixth baffle plate 305 and the seventh baffle plate 306, like air streams CA12, CA13.
- the cooling air having completed the cooling is discharged to the outside of the cover 30 through between the air tanks 2a, 2b, as shown in Fig. 4 .
- the cooling air is deflected by the ring part 201 and is thus enabled to securely collide with the heat generation surface 203. According thereto, it is possible to remarkably improve the cooling efficiency of the heat generation surface 203. Further, by providing the back plate 202, it is possible to enable the more cooling air to securely flow towards the non-motor-side (the heat generation surface 203-side), so that it is possible to further improve the cooling efficiency of the heat generation surface 203. Further, since the air flow can be enabled to flow out so as to be ejected towards the heat generation surface 203 that is arranged in front of the cooling fan 8b, it is possible to further improve the cooling efficiency.
- the cooling fan 8b sucks centrally the air and enables the air to flow out in the outer peripheral direction by using the blades 200 and the back plate 202 and applies an axial component (a component facing the non-motor-side) in the outflow direction of the air stream by the ring part 201, it is also possible to securely supply the cooling air to the heat generation surface 203, which exists on a plane different from the cooling fan 8b.
- the cooling air supplied to the heat generation surface 203 is mainly the exterior air introduced through the ventilating window 29b and not used yet for another cooling. Therefore, the cooling efficiency of the heat generation surface 203 is favorable.
- the rotational shaft 5 of the motor 4 is alternately applied with the compression load upon the compression of the air in the first cylinder 15a and the second cylinder 15b, so that a rotational variation is generated.
- a distortion vibration due to the rotational variation is generated for the cooling fan 8b.
- the ring part 201 is connected by the back plate 202, a section modulus of a cross-section, a normal line of which extends in the direction along the rotational shaft 5 of the motor 4, is remarkably increased, so that it is possible to obtain the sufficient strength against the centrifugal load and the distortion vibration load.
- the back plate 202 is provided with the blades 200, it is also possible to increase the strength of the blades 200.
- the ring part 201 and the attaching part 205 it is preferable to connect the ring part 201 and the attaching part 205 such that the back plate 202 entirely closes the motor-side between the ring part 201 and the attaching part 205, from a standpoint of increasing the cooling efficiency of the first heat generation part.
- a structure where the ring part 201 and the attaching part 205 are connected such that the back plate 202 partially closes the motor-side may also be possible.
- the ring part 201 has not only the function of changing the direction of the cooling air but a flywheel ring function of increasing the inertia force of the cooling fan 8b to thus relieve the rotational variation, thereby reducing the load to the motor 4 due to the rotational variation, which is structurally efficient.
- the ring part 201 functioning as the flywheel ring is provided with the function of changing the direction of the cooling air, so that the ring part 201 can be used to improve the cooling efficiency, which is also structurally efficient.
- the blades 200 are not limited to the centrifugal type and may be appropriately changed.
- the ring part 201 is not necessarily a complete cylindrical shape and may be formed to deflect the cooling air towards a heat generation part in addition to the control circuit 21, the case 22 and the heat generation surface 203.
- the ring part 201 is not necessarily parallel with the rotational shaft 5 of the motor 4 and may be inclined relative to the back plate 202 to guide the cooling air towards the first heat generation part.
- the cooling fan 8b may be attached such that the back plate 202 faces towards the ventilating window 29b of the cover 26.
- the compressed air which has been heated by the compression, is supplied into the cylinder head at a high flow rate and is then stored in the air tank through the piping. Therefore, since the high-temperature air flows at the high flow rate in the cylinder head, the heat transfer from the high-temperature air to the cylinder head is made to a remarkable extent, and the cylinder head of the compression part 3 becomes high temperatures. Thus, for the efficient cooling, it is required to intensively cool the cylinder head becoming the highest temperature.
- a configuration for efficiently cooling the cylinder head will be described.
- a first baffle plate 300 (a baffle wall part) is arranged in a substantially linear shape in the cover 26 such that a virtual extension line inclined relative to the rotational shaft 5 of the motor 4 passes above the first cylinder head 16a, when seen from above, towards the first cylinder 15a that is positioned at a downstream side in the rotating direction from the cooling fan 8a.
- the virtual extension line of the first baffle plate 300 coincides with a linear approximation straight line of the first baffle plate 300.
- An air path or virtual extension line of the air path following a wall surface of the first baffle plate 300 facing towards the cooling fan 8a intersects with the first cylinder head 16a, when seen from above.
- a second baffle plate 301 (a baffle wall part) is arranged above the first cylinder head 16a such that the second baffle plate 301 hangs from the cover 26 towards the first cylinder head 16a (refer to Fig. 5 ).
- the second baffle plate 301 is provided to intersect with the air path or virtual extension line of the air path following the first baffle plate 300 or the linear approximation straight line of the first baffle plate 300, and to enable the air stream guided to the first baffle plate 300 to flow towards the first cylinder head 16a or a vicinity thereof.
- a third baffle plate 302 (a baffle wall part) is arranged in a substantially linear shape at the second cylinder head 16b-side such that a virtual extension line inclined relative to the rotational shaft 5 of the motor 4 passes above the second cylinder head 16b, when seen from above.
- the virtual extension line of the third baffle plate 302 coincides with a linear approximation straight line of the third baffle plate 302.
- a fourth baffle plate 303 (a baffle wall part) is arranged to face the second cylinder head 16b (refer to Fig. 5 ).
- the fourth baffle plate 303 is provided to intersect with the air path or virtual extension line of the air path following the third baffle plate 302 or the linear approximation straight line of the third baffle plate 302, such that the fourth baffle plate 303 enables the air stream guided to the third baffle plate 302 to flow towards the second cylinder head 16b or a vicinity thereof.
- the first baffle plate 300 and the third baffle plate 302 are connected above the rotational shaft 5 of the motor 4 to thus form a substantial V shape. Further, as shown in Figs. 6 and 7 , the first baffle plate 300, the second baffle plate 301 and the third baffle plate 302 are formed as ribs extending (protruding downwardly) integrally from the cover 26, and the fourth baffle plate 303 is formed on a part of the wall surface of the cover 26. As shown in Fig. 2 , the first baffle plate 300 and the third baffle plate 302 are provided to form different angles relative to the rotational shaft 5 of the motor 4 so as to favorably cool the first cylinder head 16a and the second cylinder head 16b.
- An eighth baffle plate 307 and a ninth baffle plate 308 are provided so as to prevent the air from going round from the motor-side of the cooling fan 8a towards the non-motor-side and to prevent the air from flowing out more outwards than the first cylinder head 16a and the second cylinder head 16b in the cover 26.
- the eighth baffle plate 307 and the ninth baffle plate 308 are formed as ribs extending (hanging) integrally from the cover 26.
- the rotational shaft 5 of the motor 4 is rotated to generate the compressed air
- the cooling fan 8a is rotated to suck the air from the ventilating window 29a into the cover 26, as shown in Fig. 2 .
- the cooling air turns along the rotating direction of the cooling fan 8a, like an air stream CA20 (refer to Fig. 2 ) and flows along the the rotational shaft 5 of the motor 4 towards the compression part 3.
- the cooling air is guided to the first cylinder head 16a by the first baffle plate 300 (and the upper surface of the cover 26), like an air stream CA21, and is enabled to further flow to be ejected to the first cylinder head 16a by the second baffle plate 301, like an air stream CA22, as shown in Fig. 5 . Therefore, since it is possible to form the flowing so that the cooling air securely reaches the first cylinder head 16a by the first baffle plate 300 and the second baffle plate 301, it is possible to cool the first cylinder head 16a very effectively.
- the air stream flows along the wall surface at the high flow rate, by making the linear approximation straight line or virtual extension line of the first baffle plate 300 to face towards the first cylinder head 16a when seen from above, it is possible to securely guide the air stream of high flow rate to the first cylinder head 16a whose temperature is likely to increase. As a result, it is possible to realize the high cooling effect.
- a part of the air stream CA20 is guided to the second cylinder head 16b by the third baffle plate 302 (and the upper surface of the cover 26), like an air stream CA23, and is then enabled to flow to be ejected to a vicinity of the second cylinder head 16b by the fourth baffle plate 303, like an air stream CA24, as shown in Fig. 5 . Therefore, since it is possible to form the flowing such that the cooling air securely reaches the second cylinder head 16b by the third baffle plate 302 and the fourth baffle plate 303, it is possible to cool the second cylinder head 16b very effectively.
- the air stream flows along the wall surface at the high flow rate, by making the linear approximation straight line or virtual extension line of the third baffle plate 302 to face towards the second cylinder head 16b, when seen from above, it is possible to securely guide the air stream of high flow rate to the second cylinder head 16b whose temperature is likely to increase. As a result, it is possible to realize the high cooling effect.
- first baffle plate 300 and the third baffle plate 302 are connected above the rotational shaft 5 of the motor 4 to thus distribute an amount of the cooling air to the first cylinder head 16a and the second cylinder head 16b, so that an air volume of the first baffle plate 300 along the rotating direction of the cooling fan 8a is set to be large. Therefore, it is possible to prevent an air path resistance due to the third baffle plate 302, which is arranged against the rotating direction of the cooling fan 8a, from being excessively high, so that it is possible to favorably cool the first cylinder head 16a and the second cylinder head 16b.
- the air volume guided by the first baffle plate 300 following the turning direction of the air stream is set to be larger than the air volume guided by the third baffle plate 302 arranged against the turning direction of the air stream, it is possible to cool both the first cylinder head 16a and the second cylinder head 16b while suppressing the increase in the air path resistance due to the third baffle plate 302.
- the cooling air having completed the cooling is discharged to the outside of the cover 30 mainly through between the air tanks 2a, 2b.
- the first baffle plate 300 and the third baffle plate 302 are ideally formed to have a linear shape so as to minimize the air path resistance (the wall surfaces facing towards the cooling fan 8a-side are formed to be planar).
- the first baffle plate 300 and/or the third baffle plate 302 are partially curved/bent so as to avoid other components, for example, it is possible to guide the cooling air to the first cylinder head 16a or second cylinder head 16b inasmuch as the linear approximation straight line is formed to pass above the first cylinder head 16a or second cylinder head 16b.
- Fig. 13 is a plan view of an air compressor according to a second illustrative embodiment of the present invention, in which the cover 26 is a cross-sectional surface.
- the air compressor of this illustrative embodiment is the same as the first illustrative embodiment, except that the first baffle plate 300 and the third baffle plate 302 are curved to be convex towards the cooling fan 8a-side.
- the linear approximation straight lines and virtual extension lines of the first baffle plate 300 and the third baffle plate 302 intersect with the first cylinder head 16a and the second cylinder head 16b, when seen from above. Also in this illustrative embodiment, it is possible to obtain the same effects as the first illustrative embodiment.
- Fig. 14 is a plan view of an air compressor according to a third illustrative embodiment of the present invention, in which the cover 26 is a cross-sectional surface.
- the air compressor of this illustrative embodiment is the same as the first illustrative embodiment, except that the connection part between the first baffle plate 300 and the third baffle plate 302 is shifted from the upper of the rotational shaft 5 of the motor 4 towards the second cylinder head 16b.
- the air volume to the first cylinder head 16a is increased and the air volume to the second cylinder head 16b is decreased, as compared to the first illustrative embodiment.
- Fig. 15 is a plan view of an air compressor according to a fourth illustrative embodiment of the present invention, in which the cover 26 is a cross-sectional surface.
- the air compressor of this illustrative embodiment is the same as the first illustrative embodiment, except that the third baffle plate 302 is omitted and the first baffle plate 300 extends up to the second cylinder head 16b-side.
- the air volume to the first cylinder head 16a is increased and the air volume to the second cylinder head 16b is decreased, as compared to the first illustrative embodiment.
- the third baffle plate 302 arranged against the turning direction of the air stream is omitted, the air path resistance is reduced.
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Abstract
Description
- The present invention relates to an air compressor suitable for generation of compressed air required to drive a pneumatic tool such as a nailing machine.
- In a building site and the like, a portable pneumatic tool to drive a nail and a screw into a wooden material by a pressure of compressed air has been widely used. In general, an air compressor for driving the pneumatic tool and the like is configured to convert a rotational motion of a rotational shaft of a driving part such as a motor into a reciprocal motion of a piston in a cylinder through a crankshaft of a compression part and to compress air sucked from a suction valve of the cylinder by the reciprocal motion of the piston. The compressed air compressed in the cylinder is discharged from an exhaust valve of the cylinder to an air tank through a pipe and is stored in the air tank. When compressing the gas to a high pressure, a multistage reciprocating compressor of increasing a pressure in a stepwise manner has been generally used. The high-pressure compressed air stored in the air tank is adjusted to an appropriate pressure by a decompression valve attached to the air tank and is then supplied to the pneumatic tool and the like through an air hose. The air compressor is disclosed in
JP-A-2013-40586 - The air compressor has a plurality of heat generation parts in which the temperature thereof is high in accordance with using the motor, the compression part (particularly, the cylinder), the control circuit and the like. Thus, in many cases, the heat generation parts should be thus arranged at spaced positions. Therefore, it is necessary to securely guide the cooling air generated by the cooling fan attached to the rotational shaft of the motor to the respective heat generation parts. However, the heat generation part may be positioned at a place that is difficult to be cooled by the general cooling fan, due to a layout, which is a problem to be solved with respect to the cooling efficiency.
- It is therefore an object of the present invention to provide an air compressor capable of improving cooling efficiency by a cooling fan.
- According to one illustrative aspect of the present invention, there is provided an air compressor comprising: an air tank configured to store therein compressed air; a compression part configured to compress air sucked from an outside and to supply the air to the air tank; a motor configured to drive the compression part; a cooling fan provided at one end-side of a rotational shaft of the motor, and a cover configured to cover at least the compression part, the motor and the cooling fan, characterized in that the cooling fan comprises a ring part provided at an outer peripheral part thereof and having a substantially cylindrical shape, and the cooling fan is configured to change a direction of an air stream by the ring part.
- Incidentally, any combination of the above-described elements, and a method, a system and the like converted from the expressions of the present invention are also effective as the aspects of the present invention.
- According to the illustrative aspects of the present invention, it is possible to provide an air compressor capable of improving cooling efficiency by a cooling fan.
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Fig. 1 is a perspective view of an air compressor 1 according to a first illustrative embodiment of the present invention; -
Fig. 2 is a plan view of the air compressor 1 in which acover 26 is a cross-sectional surface; -
Fig. 3 is a plan sectional view of the air compressor 1; -
Fig. 4 is a IV-IV sectional view ofFig. 2 ; -
Fig. 5 is a front sectional view of the air compressor 1 ; -
Fig. 6 is a first perspective view from below of thecover 26 of the air compressor 1; -
Fig. 7 is a second perspective view from below of thecover 26 of the air compressor 1; -
Fig. 8 is an VIII-VIII sectional view ofFig. 4 relating to thecover 26 of the air compressor 1; -
Fig. 9 is a IX-IX sectional view ofFig. 4 relating to thecover 26 of the air compressor 1; -
Fig. 10 is a perspective view of acooling fan 8b of the air compressor 1; -
Fig. 11 is a perspective view of acooling fan 8a of the air compressor 1; -
Fig. 12 is a perspective view of aseventh baffle plate 306 of the air compressor 1 ; -
Fig. 13 is a plan view of an air compressor according to a second illustrative embodiment of the present invention, in which thecover 26 is a cross-sectional surface; -
Fig. 14 is a plan view of an air compressor according to a third illustrative embodiment of the present invention, in which thecover 26 is a cross-sectional surface; and -
Fig. 15 is a plan view of an air compressor according to a fourth illustrative embodiment of the present invention, in which thecover 26 is a cross-sectional surface. - Hereinafter, preferred illustrative embodiments of the present invention will be described with reference to the drawings. Incidentally, the same or equivalent elements, members and the like shown in the respective drawings are denoted with the same reference numerals and the overlapping descriptions are appropriately omitted. Also, the illustrative embodiments are just exemplary, not to limit the present invention, and all features and combinations thereof described in the illustrative embodiments cannot be considered as the essentials of the present invention.
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Fig. 1 is a perspective view of an air compressor 1 according to a first illustrative embodiment of the present invention.Fig. 2 is a plan view of the air compressor 1 in which acover 26 is a cross-sectional surface. Incidentally, inFig. 2 , grippingparts Fig. 3 is a plan sectional view of the air compressor 1.Fig. 4 is a IV-IV sectional view ofFig. 2 .Fig. 5 is a front sectional view of the air compressor 1.Fig. 6 is a first perspective view from below of thecover 26 of the air compressor 1.Fig. 7 is a second perspective view from below of thecover 26 of the air compressor 1.Fig. 8 is an VIII-VIII sectional view ofFig. 4 relating to thecover 26 of the air compressor 1.Fig. 9 is a IX-IX sectional view ofFig. 4 .Fig. 10 is a perspective view of acooling fan 8b of the air compressor 1.Fig. 11 is a perspective view of acooling fan 8a of the air compressor 1.Fig. 12 is a perspective view of aseventh baffle plate 306 of the air compressor 1. - The air compressor 1 includes: a pair of
air tanks air tanks air tanks air tanks - As shown in
Fig. 3 , arotational shaft 5 of the motor 4 penetrates the compression part 3, and acooling fan 8a (a first cooling fan) is provided at a motor-side end portion of therotational shaft 5 of the motor 4 and acooling fan 8b (a second cooling fan) is provided at a non-motor-side end portion of therotational shaft 5 of the motor 4. Thecooling fans - As shown in
Fig. 2 ,decompression valves pressure meters couplers air tanks couplers - As shown in
Fig. 2 , theair tanks safety valve 12 and adrain discharge device 13. Thesafety valve 12 is configured to discharge a part of the compressed air to the outside when a pressure is abnormally increased. Thedrain discharge device 13 has anoperation part 14. When theoperation part 14 is operated, the compressed air and moisture in theair tanks - As shown in
Fig. 3 , the compression part 3 is provided therein with a crank mechanism. A rotational motion of therotational shaft 5 of the motor 4 is converted into reciprocal motions of afirst piston 34a and asecond piston 34b through a first connectingrod 33a and a second connectingrod 33b, respectively. Thefirst piston 34a is accommodated in afirst cylinder 15a and afirst cylinder head 16a. Thesecond piston 34b is accommodated in asecond cylinder 15b and asecond cylinder head 16b. Thefirst cylinder 15a and thesecond cylinder 15b are horizontally opposed to each other with therotational shaft 5 of the motor 4 being interposed therebetween. Thefirst cylinder 15a and thesecond cylinder 15b are arranged to be substantially parallel with theair tanks second cylinder 15b (a low pressure-side cylinder) and the air compressed by thesecond cylinder 15b is supplied to thefirst cylinder 15a (a high pressure-side cylinder) through apiping 19a (refer toFig. 2 ). The air further compressed by thefirst cylinder 15a is supplied to theair tank 2a through apiping 19b. Theair tanks connection pipe 20, so that the pressures of theair tanks - As shown in
Fig. 3 , a control circuit 21 (a control circuit board) for driving the motor 4 is accommodated in acase 22. Thecontrol circuit 21 is arranged to face the coolingfan 8b at the non-motor-side of the compression part 3. Thecontrol circuit 21 is fixed to theair tank 2a. The motor 4, which is a DC brushless motor, has astator coil 23, arotor 24 arranged in thestator coil 23 and a Hall element board 25 (refer toFig. 2 ) for detecting a rotating position of therotor 24. The motor 4 is inverter-controlled by thecontrol circuit 21. Thecontrol circuit 21 includes a heat generation component 204 (refer toFig. 3 ) such as a semiconductor switching element for inverter control. A surface of thecase 22 on which theheat generation component 204 is attached is configured as aheat generation surface 203, from which a heat is to be radiated or which is to be cooled. - As shown in
Fig. 1 , acover 26 for covering the components of the air compressor such as the compression part 3, the motor 4, thecontrol circuit 21 and the like is arranged above theair tanks air tanks air tanks gripping parts cover 26 is provided with anoperation panel 26 having a power supply switch (not shown) for operating the air compressor 1 and the like. Thecover 26 is provided with ventilatingwindows Figs. 6 and7 ) on wall surfaces facing the coolingfans Fig. 4 ) for preventing foreign materials from being introduced is additionally attached between theair tanks air tanks leg parts 32 for preventing theair tanks air tanks - During an operation of the air compressor 1, the motor 4 is alternately applied with a compression load upon compression of the air by the reciprocal motions of the
first piston 34a and thesecond piston 34b. For this reason, load currents are generated in thestator coil 23 and thecontrol circuit 21, so that temperatures of thestator coil 23 and thecontrol circuit 21 are increased by Joule heats accompanied by the load currents. Also, temperatures of thefirst cylinder 15a, thefirst cylinder head 16a, thesecond cylinder 15b and thesecond cylinder head 16b are increased by compression heat of the compressed air. Temperatures of thepipings air tanks first cylinder 15a, thefirst cylinder head 16a, thesecond cylinder 15b, thesecond cylinder head 16b, thestator coil 23, thecontrol circuit 21, thecase 22 and the like. Hereinafter, configurations relating to the cooling will be described. - In a typical axial flow fan, a generated air stream has a tendency to flow in an outer peripheral direction due to a high centrifugal force thereof. Therefore, it is difficult to promote the air stream in the adjacent motor, and thus the heat is likely to be accumulated in the motor. Here, a configuration for improving cooling performance of the motor 4 will be described.
- As shown in
Fig. 11 , the coolingfan 8a hasouter blades 104 andinner blades 105. Theouter blades 104 and theinner blades 105 are connected to each other by a cylindrical partition part (cylindrical part) 102. Thepartition part 102 extends in a direction along the rotational shaft of the motor 4. An attachingpart 103 is formed at a further inner side of theinner blades 105. The coolingfan 8a can be attached to therotational shaft 5 of the motor 4 by the attachingpart 103. Theinner blades 105 are formed integrally with thepartition part 102 and the attachingpart 103. Theinner blades 105 are formed into a curved plate shape extending substantially parallel with therotational shaft 5 of the motor 4, a so-called centrifugal type. The coolingfan 8a has a through-hole, which is formed by the adjacentinner blades 105,partition part 102 and attachingpart 103. The through-hole is formed such that an opening area of a non-motor-side opening 107 is smaller than an opening area of a motor-side opening 106 at an opposite side (refer toFig. 3 ). Theouter blades 104 are formed into a curved shape extending obliquely relative to the direction along therotational shaft 5 of the motor 4, a so-called axial flow type. As shown inFig. 3 , an outer diameter D2 of theouter blades 104 is set to be larger than an outer diameter D1 of the motor 4. Thecover 26 is formed with the ventilatingwindow 29a facing the coolingfan 8a. A central portion of the ventilatingwindow 29a is formed with a shield plate 101 (refer toFigs. 7 and8 ) facing theinner blades 105 and serving as a shield part. - When the motor 4 is operated, the cooling
fan 8a is rotated to generate an air stream. That is, the exterior air is sucked from an outside through the ventilatingwindow 29a by theouter blades 104, and an air stream CA1 flowing towards thefirst cylinder 15a, thefirst cylinder head 16a, thesecond cylinder 15b and thesecond cylinder head 16b, as shown inFig. 3 , is generated. Also, a part of the air stream generated by theouter blades 104 flows towards thestator coil 23, like an air stream CA2. At this time, by a negative pressure P1 additionally generated by theinner blades 105, the air in the vicinity of thestator coil 23 is sucked to theinner blades 105, like an air stream CA3. The air sucked to theinner blades 105 is enabled to flow out from the motor-side opening 106 towards the non-motor-side opening 107 by a negative pressure P2 generated by theouter blades 104, and is then sucked to theouter blades 104, like an air stream CA4. Thereafter, the air sucked to theouter blades 104 like the air stream CA4 is enabled to flow out together with the air stream CA1. As shown inFig. 4 , the cooling wind having completed the cooling is discharged to the outside of thecover 30 through between theair tanks - According thereto, it is possible to generate the air streams CA3, CA4 by the inner blades 105 (the air stream generated by the
inner blades 105 is restrained by a cylindrical inner surface of thepartition part 102 and is securely enabled to flow in a direction along a rotational shaft of the coolingfan 8a). Therefore, a synergetic effect with the air streams CA1, CA2 of theouter blades 104 can be exhibited, and it is possible to generate a high flow rate in the vicinity of thestator coil 23, in which the air stream is stagnant in the related art. According thereto, it is possible to effectively suppress the temperature increase of thestator coil 23. That is, it is possible to realize the auxiliary effect or synergetic effect for the air stream of theouter blades 104, which is likely to flow in the outer peripheral direction due to the high centrifugal force, by theinner blades 105, so that it is possible to improve the cooling performance of the motor 4 by the coolingfan 8a. - Further, the
rotational shaft 5 of the motor 4 is alternately applied with the compression load upon the compression of the air in thefirst cylinder 15a and thesecond cylinder 15b, so that a rotational variation is generated. Thus, a distortion vibration due to the rotational variation is generated for the coolingfan 8a. However, the attachingpart 103 and thepartition part 102 are strongly connected using the plurality ofinner blades 105. According thereto, it is possible to disperse and reduce the stress resulting from the distortion vibration, thereby increasing the strength and reliability of the coolingfan 8a. Further, since theinner blades 105 also serve as a connection part (a frame) connecting thepartition part 102 and the attachingpart 103 each other, it is not necessary to separately form a connection part, which does not contribute to the air stream, so that the structure is efficient. Incidentally, by increasing the number of theinner blades 105, it is possible to improve the performance of theinner blades 105 as a fan and to improve the connection strength of thepartition part 102 and the attachingpart 103. - Further, the cooling
fan 8a has a difference in the opening area between the non-motor-side opening 107 and the motor-side opening 106. According thereto, it is easy to control the flowing direction of the air stream generated by theinner blades 105. That is, it is possible to appropriately control the flowing direction of the air stream generated by theinner blades 105 by appropriately adjusting an opening area ratio between the non-motor-side opening 107 and the motor-side opening 106. - Further, the
outer blades 104 suck the air from the non-motor-side (the outside of the cover 26) and enable the air stream to flow out towards the motor 4 and the compression part 3. Therefore, it is possible to suck a large amount of the exterior air having a temperature lower than the temperature in thecover 26 into thecover 26 and to extensively cool the motor 4, the compression part 3 and the like. - Further, since the
shield plate 101 is provided, the negative pressure P2 between the coolingfan 8a and theshield plate 101 by the action of theouter blades 104 is enhanced. According thereto, it is possible to further promote the air streams CA3, CA4, thereby considerably improving the cooling efficiency. That is, it is possible to enable the air in the vicinity of the motor 4, which is sucked to the central part of the coolingfan 8a by the negative pressure (suction) by theinner blades 105, to smoothly flow towards the non-motor-side of theinner blades 105 and to further improve the cooling effect in the vicinity of the motor by the synergetic effect of the negative pressures of theouter blades 104 and theinner blades 105. - Further, the outer diameter D2 of the
outer blades 104 is set to be larger than the outer diameter D1 of the motor 4. According thereto, a part of the air stream generated by theouter blades 104 is directly supplied to the compression part 3 without via the motor 4. As a result, it is possible to improve the cooling efficiency of the compression part 3. - Further, the air volume by the
outer blades 104 is set to be larger than the air volume enabled to flow through the inner side of thepartition part 102 by theinner blades 105. According thereto, it is easy to enable a part of the air stream, which is generated by theinner blades 105 mainly generating the air stream in the vicinity of the motor 4, to flow together with the air stream generated by theouter blades 104. Therefore, it is possible to securely supply the air stream after the cooling of the motor to the compression part 3 and to finally discharge the air stream to the outside of the cover. Thus, it is possible to exclude the bad influence on the cooling performance, which is caused as the heat is accumulated in the vicinity of the motor 4, thereby improving the cooling performance. - Incidenatlly, it may be possible to appropriately change the area ratio between the motor-
side opening 106 and the non-motor-side opening 107 of the coolingfan 8a and to appropriately change the shapes of theinner blade 105 and theouter blade 104. - In general, the air compressor has a plurality of heat generation parts in which the temperature thereof is high in accordance with using the motor, the compression part (particularly, the cylinder), the control circuit and the like. Thus, in many cases, the heat generation parts should be arranged at spaced positions. Therefore, it is necessary to securely guide the cooling air generated by the cooling fan attached to the rotational shaft of the motor to the respective heat generation parts. However, the heat generation part may be positioned at a place that is difficult to be cooled by the general cooling fan, due to a layout, which is a problem to be solved with respect to the cooling efficiency. Regarding this problem, a configuration for improving the cooling efficiency will be described.
- As shown in
Figs. 3 and4 , thecase 22 and thecontrol circuit 21 are arranged to face the coolingfan 8b that is attached to the end portion of the non-motor-side of therotational shaft 5 of the motor 4. In thecase 22, theheat generation surface 203 of the accommodatedcontrol circuit 21, on which theheat generation component 204 is mounted, faces the coolingfan 8b. Theheat generation component 204 faces an outer peripheral part (aring part 201 that will be described later) of the coolingfan 8b with theheat generation surface 203 being interposed therebetween. Theheat generation component 204 is an IGBT (insulated gate bipolar transistor), a diode bridge, an IPM (intelligent power module) and the like. - As shown in
Fig. 10 , the coolingfan 8b has aback plate 202 serving as a plate shape part formed on a flat plate, a normal line of which is set to a direction along therotational shaft 5 of the motor 4.Blades 200 extending substantially parallel with therotational shaft 5 of the motor 4 from an inner side of theback plate 202 towards an outer periphery thereof are centrifugally formed on theback plate 202. An attachingpart 205 is formed at an inner side of theblades 200. The coolingfan 8b can be attached to therotational shaft 5 of the motor 4 by the attachingpart 205. The outer peripheral end of the coolingfan 8b is formed with thering part 201. Thering part 201 has a cylindrical shape substantially parallel with therotational shaft 5 of the motor 4. Thering part 201 extends from theback plate 202 towards theheat generation surface 203. Thering part 201 and the attachingpart 205 are connected and integrated over an entire circumference by theback plate 202. Theback plate 202 entirely closes the motor-side between thering part 201 and the attachingpart 205. - Further, as shown in
Fig. 2 , a fifth baffle plate 304 (a baffle wall part), a sixth baffle plate 305 (a baffle wall part) and a seventh baffle plate 306 (a baffle wall part) are provided in the vicinity of the coolingfan 8b. Thefifth baffle plate 304 and thesixth baffle plate 305 are formed as ribs hanging from thecover 26. Theseventh baffle plate 306 shown as a unitary member inFig. 12 is attached to thecase 22 by a screw material. Theseventh baffle plate 306 is formed from thecase 22 towards the non-motor-side of thesecond cylinder 15b, as shown inFig. 2 . Thefifth baffle plate 304 hangs from thecover 26 towards thecase 22. Thefifth baffle plate 304 is formed with an opening 207 (a notched portion) having a diameter that is smaller than a diameter D3 (refer toFig. 4 ) of the coolingfan 8b (refer toFigs. 4 and6 and the like). Thesixth baffle plate 305 is formed integrally with thefifth baffle plate 304 and is smoothly formed from thefifth baffle plate 304 towards the non-motor-side of thefirst cylinder 15a. A wall surface of thecover 26 facing the coolingfan 8b is formed with the ventilatingwindow 29b. - As shown in
Fig. 3 , when the motor 4 is operated, the exterior air is sucked from the outside through the ventilatingwindow 29b by the coolingfan 8b, like an air stream CA10, and is guided to the central part of the coolingfan 8b by theopening 207. The air stream CA10 flows towards the outer periphery of the coolingfan 8b along theback plate 202, like an air stream CA11. Then, as shown inFig. 3 , the air stream CA11 is deflected (a flowing direction thereof is changed) by thering part 201 such that the flowing direction of the air stream CA11 closes to parallel with the suction direction of the air stream CA10 by the coolingfan 8b, flows towards and collides with the heat generation surface 203 (a first heat generation part) and further flows radially from the coolingfan 8b along theheat generation surface 203. A part of the air stream CA11 is guided towards the non-motor-sides (a second heat generation part) of thefirst cylinder 15a and thesecond cylinder 15b by thefifth baffle plate 304, thesixth baffle plate 305 and theseventh baffle plate 306, like air streams CA12, CA13. The cooling air having completed the cooling is discharged to the outside of thecover 30 through between theair tanks Fig. 4 . - In this way, the cooling air is deflected by the
ring part 201 and is thus enabled to securely collide with theheat generation surface 203. According thereto, it is possible to remarkably improve the cooling efficiency of theheat generation surface 203. Further, by providing theback plate 202, it is possible to enable the more cooling air to securely flow towards the non-motor-side (the heat generation surface 203-side), so that it is possible to further improve the cooling efficiency of theheat generation surface 203. Further, since the air flow can be enabled to flow out so as to be ejected towards theheat generation surface 203 that is arranged in front of the coolingfan 8b, it is possible to further improve the cooling efficiency. That is, since the coolingfan 8b sucks centrally the air and enables the air to flow out in the outer peripheral direction by using theblades 200 and theback plate 202 and applies an axial component (a component facing the non-motor-side) in the outflow direction of the air stream by thering part 201, it is also possible to securely supply the cooling air to theheat generation surface 203, which exists on a plane different from the coolingfan 8b. The cooling air supplied to theheat generation surface 203 is mainly the exterior air introduced through the ventilatingwindow 29b and not used yet for another cooling. Therefore, the cooling efficiency of theheat generation surface 203 is favorable. - Further, it is possible to utilize the cooling air having cooled the
heat generation surface 203 and the cooling air having not reached theheat generation surface 203 for cooling thefirst cylinder 15a and thesecond cylinder 15b by thefifth baffle plate 304, thesixth baffle plate 305 and theseventh baffle plate 306. The effect of this configuration is very advantageous, because the non-motor-sides of thefirst cylinder 15a and thesecond cylinder 15b are difficult to be cooled by the air stream CA1 generated by the coolingfan 8a and the temperatures thereof are likely to increase. - Further, the
rotational shaft 5 of the motor 4 is alternately applied with the compression load upon the compression of the air in thefirst cylinder 15a and thesecond cylinder 15b, so that a rotational variation is generated. Thus, a distortion vibration due to the rotational variation is generated for the coolingfan 8b. However, since thering part 201 is connected by theback plate 202, a section modulus of a cross-section, a normal line of which extends in the direction along therotational shaft 5 of the motor 4, is remarkably increased, so that it is possible to obtain the sufficient strength against the centrifugal load and the distortion vibration load. Further, since theback plate 202 is provided with theblades 200, it is also possible to increase the strength of theblades 200. Incidentally, it is preferable to connect thering part 201 and the attachingpart 205 such that theback plate 202 entirely closes the motor-side between thering part 201 and the attachingpart 205, from a standpoint of increasing the cooling efficiency of the first heat generation part. Alternatively, a structure where thering part 201 and the attachingpart 205 are connected such that theback plate 202 partially closes the motor-side may also be possible. - Further, the
ring part 201 has not only the function of changing the direction of the cooling air but a flywheel ring function of increasing the inertia force of the coolingfan 8b to thus relieve the rotational variation, thereby reducing the load to the motor 4 due to the rotational variation, which is structurally efficient. From another standpoint, thering part 201 functioning as the flywheel ring is provided with the function of changing the direction of the cooling air, so that thering part 201 can be used to improve the cooling efficiency, which is also structurally efficient. - Incidentally, the
blades 200 are not limited to the centrifugal type and may be appropriately changed. Thering part 201 is not necessarily a complete cylindrical shape and may be formed to deflect the cooling air towards a heat generation part in addition to thecontrol circuit 21, thecase 22 and theheat generation surface 203. Thering part 201 is not necessarily parallel with therotational shaft 5 of the motor 4 and may be inclined relative to theback plate 202 to guide the cooling air towards the first heat generation part. The coolingfan 8b may be attached such that theback plate 202 faces towards the ventilatingwindow 29b of thecover 26. - During the compression process by the piston in the compression part 3, the compressed air, which has been heated by the compression, is supplied into the cylinder head at a high flow rate and is then stored in the air tank through the piping. Therefore, since the high-temperature air flows at the high flow rate in the cylinder head, the heat transfer from the high-temperature air to the cylinder head is made to a remarkable extent, and the cylinder head of the compression part 3 becomes high temperatures. Thus, for the efficient cooling, it is required to intensively cool the cylinder head becoming the highest temperature. Hereinafter, a configuration for efficiently cooling the cylinder head will be described.
- As shown in
Fig. 2 , a first baffle plate 300 (a baffle wall part) is arranged in a substantially linear shape in thecover 26 such that a virtual extension line inclined relative to therotational shaft 5 of the motor 4 passes above thefirst cylinder head 16a, when seen from above, towards thefirst cylinder 15a that is positioned at a downstream side in the rotating direction from the coolingfan 8a. Here, the virtual extension line of thefirst baffle plate 300 coincides with a linear approximation straight line of thefirst baffle plate 300. An air path or virtual extension line of the air path following a wall surface of thefirst baffle plate 300 facing towards the coolingfan 8a intersects with thefirst cylinder head 16a, when seen from above. - A second baffle plate 301 (a baffle wall part) is arranged above the
first cylinder head 16a such that thesecond baffle plate 301 hangs from thecover 26 towards thefirst cylinder head 16a (refer toFig. 5 ). Thesecond baffle plate 301 is provided to intersect with the air path or virtual extension line of the air path following thefirst baffle plate 300 or the linear approximation straight line of thefirst baffle plate 300, and to enable the air stream guided to thefirst baffle plate 300 to flow towards thefirst cylinder head 16a or a vicinity thereof. - A third baffle plate 302 (a baffle wall part) is arranged in a substantially linear shape at the
second cylinder head 16b-side such that a virtual extension line inclined relative to therotational shaft 5 of the motor 4 passes above thesecond cylinder head 16b, when seen from above. Here, the virtual extension line of thethird baffle plate 302 coincides with a linear approximation straight line of thethird baffle plate 302. An air path or virtual extension line of the air path following a wall surface of thethird baffle plate 302, which faces towards the coolingfan 8a, intersects with thesecond cylinder head 16b, when seen from above. - A fourth baffle plate 303 (a baffle wall part) is arranged to face the
second cylinder head 16b (refer toFig. 5 ). Thefourth baffle plate 303 is provided to intersect with the air path or virtual extension line of the air path following thethird baffle plate 302 or the linear approximation straight line of thethird baffle plate 302, such that thefourth baffle plate 303 enables the air stream guided to thethird baffle plate 302 to flow towards thesecond cylinder head 16b or a vicinity thereof. - The
first baffle plate 300 and thethird baffle plate 302 are connected above therotational shaft 5 of the motor 4 to thus form a substantial V shape. Further, as shown inFigs. 6 and7 , thefirst baffle plate 300, thesecond baffle plate 301 and thethird baffle plate 302 are formed as ribs extending (protruding downwardly) integrally from thecover 26, and thefourth baffle plate 303 is formed on a part of the wall surface of thecover 26. As shown inFig. 2 , thefirst baffle plate 300 and thethird baffle plate 302 are provided to form different angles relative to therotational shaft 5 of the motor 4 so as to favorably cool thefirst cylinder head 16a and thesecond cylinder head 16b. - An
eighth baffle plate 307 and a ninth baffle plate 308 (refer toFig. 7 ) are provided so as to prevent the air from going round from the motor-side of the coolingfan 8a towards the non-motor-side and to prevent the air from flowing out more outwards than thefirst cylinder head 16a and thesecond cylinder head 16b in thecover 26. Theeighth baffle plate 307 and theninth baffle plate 308 are formed as ribs extending (hanging) integrally from thecover 26. - During the operation of the air compressor 1, the
rotational shaft 5 of the motor 4 is rotated to generate the compressed air, and the coolingfan 8a is rotated to suck the air from the ventilatingwindow 29a into thecover 26, as shown inFig. 2 . The cooling air turns along the rotating direction of the coolingfan 8a, like an air stream CA20 (refer toFig. 2 ) and flows along the therotational shaft 5 of the motor 4 towards the compression part 3. Then, the cooling air is guided to thefirst cylinder head 16a by the first baffle plate 300 (and the upper surface of the cover 26), like an air stream CA21, and is enabled to further flow to be ejected to thefirst cylinder head 16a by thesecond baffle plate 301, like an air stream CA22, as shown inFig. 5 . Therefore, since it is possible to form the flowing so that the cooling air securely reaches thefirst cylinder head 16a by thefirst baffle plate 300 and thesecond baffle plate 301, it is possible to cool thefirst cylinder head 16a very effectively. Here, since the air stream flows along the wall surface at the high flow rate, by making the linear approximation straight line or virtual extension line of thefirst baffle plate 300 to face towards thefirst cylinder head 16a when seen from above, it is possible to securely guide the air stream of high flow rate to thefirst cylinder head 16a whose temperature is likely to increase. As a result, it is possible to realize the high cooling effect. - Further, a part of the air stream CA20 is guided to the
second cylinder head 16b by the third baffle plate 302 (and the upper surface of the cover 26), like an air stream CA23, and is then enabled to flow to be ejected to a vicinity of thesecond cylinder head 16b by thefourth baffle plate 303, like an air stream CA24, as shown inFig. 5 . Therefore, since it is possible to form the flowing such that the cooling air securely reaches thesecond cylinder head 16b by thethird baffle plate 302 and thefourth baffle plate 303, it is possible to cool thesecond cylinder head 16b very effectively. Here, since the air stream flows along the wall surface at the high flow rate, by making the linear approximation straight line or virtual extension line of thethird baffle plate 302 to face towards thesecond cylinder head 16b, when seen from above, it is possible to securely guide the air stream of high flow rate to thesecond cylinder head 16b whose temperature is likely to increase. As a result, it is possible to realize the high cooling effect. - Further, the
first baffle plate 300 and thethird baffle plate 302 are connected above therotational shaft 5 of the motor 4 to thus distribute an amount of the cooling air to thefirst cylinder head 16a and thesecond cylinder head 16b, so that an air volume of thefirst baffle plate 300 along the rotating direction of the coolingfan 8a is set to be large. Therefore, it is possible to prevent an air path resistance due to thethird baffle plate 302, which is arranged against the rotating direction of the coolingfan 8a, from being excessively high, so that it is possible to favorably cool thefirst cylinder head 16a and thesecond cylinder head 16b. That is, since the air volume guided by thefirst baffle plate 300 following the turning direction of the air stream is set to be larger than the air volume guided by thethird baffle plate 302 arranged against the turning direction of the air stream, it is possible to cool both thefirst cylinder head 16a and thesecond cylinder head 16b while suppressing the increase in the air path resistance due to thethird baffle plate 302. The cooling air having completed the cooling is discharged to the outside of thecover 30 mainly through between theair tanks - Incidentally, the
first baffle plate 300 and thethird baffle plate 302 are ideally formed to have a linear shape so as to minimize the air path resistance (the wall surfaces facing towards the coolingfan 8a-side are formed to be planar). However, even though thefirst baffle plate 300 and/or thethird baffle plate 302 are partially curved/bent so as to avoid other components, for example, it is possible to guide the cooling air to thefirst cylinder head 16a orsecond cylinder head 16b inasmuch as the linear approximation straight line is formed to pass above thefirst cylinder head 16a orsecond cylinder head 16b. -
Fig. 13 is a plan view of an air compressor according to a second illustrative embodiment of the present invention, in which thecover 26 is a cross-sectional surface. The air compressor of this illustrative embodiment is the same as the first illustrative embodiment, except that thefirst baffle plate 300 and thethird baffle plate 302 are curved to be convex towards the coolingfan 8a-side. The linear approximation straight lines and virtual extension lines of thefirst baffle plate 300 and thethird baffle plate 302 intersect with thefirst cylinder head 16a and thesecond cylinder head 16b, when seen from above. Also in this illustrative embodiment, it is possible to obtain the same effects as the first illustrative embodiment. -
Fig. 14 is a plan view of an air compressor according to a third illustrative embodiment of the present invention, in which thecover 26 is a cross-sectional surface. The air compressor of this illustrative embodiment is the same as the first illustrative embodiment, except that the connection part between thefirst baffle plate 300 and thethird baffle plate 302 is shifted from the upper of therotational shaft 5 of the motor 4 towards thesecond cylinder head 16b. In this illustrative embodiment, the air volume to thefirst cylinder head 16a is increased and the air volume to thesecond cylinder head 16b is decreased, as compared to the first illustrative embodiment. However, it is possible to reduce the air path resistance due to thethird baffle plate 302 arranged against the turning direction of the air stream. -
Fig. 15 is a plan view of an air compressor according to a fourth illustrative embodiment of the present invention, in which thecover 26 is a cross-sectional surface. The air compressor of this illustrative embodiment is the same as the first illustrative embodiment, except that thethird baffle plate 302 is omitted and thefirst baffle plate 300 extends up to thesecond cylinder head 16b-side. In this illustrative embodiment, the air volume to thefirst cylinder head 16a is increased and the air volume to thesecond cylinder head 16b is decreased, as compared to the first illustrative embodiment. However, since thethird baffle plate 302 arranged against the turning direction of the air stream is omitted, the air path resistance is reduced. - Although the present invention has been described with reference to the illustrative embodiments, it can be understood by one skilled in the art that the respective elements and respective processes of the illustrative embodiments can be variously modified within the scope defined in the claims.
- The following matters may also be disclosed in this specification.
- (1) An air compressor comprising: an air tank configured to store therein compressed air; a compression part configured to compress air sucked from an outside and to supply the air to the air tank; a motor configured to drive the compression part; a cooling fan provided at one end-side of a rotational shaft of the motor, and a cover configured to cover at least the compression part, the motor and the cooling fan, characterized in that the cooling fan comprises a ring part provided at an outer peripheral part thereof and having a substantially cylindrical shape, and the cooling fan is configured to change a direction of an air stream by the ring part.
- (2) The air compressor according to (1), wherein the ring part is configured to guide the air stream to a first heat generation part.
- (3) The air compressor according to (1) or (2), wherein the cooling fan comprises a plate-shaped part partially bridging between an attaching part to the rotational shaft and the ring part.
- (4) The air compressor according to (3), wherein the attaching part and the ring part are connected and integrated over an entire circumference by the plate-shaped part.
- (5) The air compressor according to (3) or (4), wherein the cooling fan comprises a blade for generating an air stream, and wherein the blade is integrated with the plate-shaped part.
- (6) The air compressor according to any one of (1) to (5), wherein the cooling fan is configured to generate an air stream flowing from a center-side towards an outer peripheral direction by a rotation of the blade and to change a direction of the air stream such that the air stream has a component in a direction along the rotational shaft.
- (7) The air compressor according to (6), wherein a first heat generation part is arranged at a position which faces the cooling fan and with which the air stream which direction has been changed by the ring part collides.
- (8) The air compressor according to (7), wherein a baffle wall part is provided at a position facing a part except for a central part of the cooling fan at the same side as the first heat generation part, wherein the cooling fan is configured to suck the air stream through between the first heat generation part and the baffle wall part, and wherein the ring part enables an outflow direction of the air stream of the cooling fan to be close to parallel with the suction direction of the air stream.
- (9) The air compressor according to (7) or (8), wherein the first heat generation part is a control circuit board or a holding member of the control circuit board.
- (10) The air compressor according to any one of (1) to (9), wherein the cover comprises a ventilating window at a position facing a suction-side of the cooling fan.
- (11) The air compressor according to any one of (1) to (10), further comprising a baffle wall part configured to change a direction of the air stream outflowing from the cooling fan and to guide the air stream towards a second heat generation part.
- (12) The air compressor according to (11), wherein the second heat generation part is a cylinder of the compression part.
- (13) The air compressor according to (12), further comprising another cooling fan provided at the other end-side of the rotational shaft of the motor, wherein the baffle wall part is configured to guide the air stream outflowing from the cooling fan to a side of the cylinder with which an air stream from said another cooling fan does not collide.
Claims (13)
- An air compressor comprising:an air tank configured to store therein compressed air;a compression part configured to compress air sucked from an outside and to supply the air to the air tank;a motor configured to drive the compression part;a cooling fan provided at one end-side of a rotational shaft of the motor, anda cover configured to cover at least the compression part, the motor and the cooling fan,characterized in thatthe cooling fan comprises a ring part provided at an outer peripheral part thereof and having a substantially cylindrical shape, andthe cooling fan is configured to change a direction of an air stream by the ring part.
- The air compressor according to claim 1, wherein the ring part is configured to guide the air stream to a first heat generation part.
- The air compressor according to claim 1 or 2, wherein the cooling fan comprises a plate-shaped part partially bridging between an attaching part to the rotational shaft and the ring part.
- The air compressor according to claim 3, wherein the attaching part and the ring part are connected and integrated over an entire circumference by the plate-shaped part.
- The air compressor according to claim 3 or 4,
wherein the cooling fan comprises a blade for generating an air stream, and
wherein the blade is integrated with the plate-shaped part. - The air compressor according to any one of claims 1 to 5, wherein the cooling fan is configured to generate an air stream flowing from a center-side towards an outer peripheral direction by a rotation of the blade and to change a direction of the air stream such that the air stream has a component in a direction along the rotational shaft.
- The air compressor according to claim 6, wherein a first heat generation part is arranged at a position which faces the cooling fan and with which the air stream which direction has been changed by the ring part collides.
- The air compressor according to claim 7,
wherein a baffle wall part is provided at a position facing a part except for a central part of the cooling fan at the same side as the first heat generation part,
wherein the cooling fan is configured to suck the air stream through between the first heat generation part and the baffle wall part, and
wherein the ring part enables an outflow direction of the air stream of the cooling fan to be close to parallel with the suction direction of the air stream. - The air compressor according to claim 7 or 8, wherein the first heat generation part is a control circuit board or a holding member of the control circuit board.
- The air compressor according to any one of claims 1 to 9, wherein the cover comprises a ventilating window at a position facing a suction-side of the cooling fan.
- The air compressor according to any one of claims 1 to 10, further comprising a baffle wall part configured to change a direction of the air stream outflowing from the cooling fan and to guide the air stream towards a second heat generation part.
- The air compressor according to claim 11, wherein the second heat generation part is a cylinder of the compression part.
- The air compressor according to claim 12, further comprising another cooling fan provided at the other end-side of the rotational shaft of the motor,
wherein the baffle wall part is configured to guide the air stream outflowing from the cooling fan to a side of the cylinder with which an air stream from said another cooling fan does not collide.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP2013193538A JP2015059504A (en) | 2013-09-18 | 2013-09-18 | Air compressor |
Publications (1)
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EP2853745A1 true EP2853745A1 (en) | 2015-04-01 |
Family
ID=51357818
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP14181256.0A Withdrawn EP2853745A1 (en) | 2013-09-18 | 2014-08-18 | Air compressor |
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US (1) | US20150078938A1 (en) |
EP (1) | EP2853745A1 (en) |
JP (1) | JP2015059504A (en) |
CN (1) | CN104454460A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108397370A (en) * | 2017-05-04 | 2018-08-14 | 广东温博节能环保科技有限公司 | Heat sinking formula permanent-magnetic variable-frequency air compressor |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10125790B2 (en) * | 2014-07-24 | 2018-11-13 | Mahle International Gmbh | Centrifugal fan with reduced motor cooling noise |
CN110173418A (en) * | 2019-01-10 | 2019-08-27 | 苏州欧圣电气股份有限公司 | A kind of air pressure pump and air compressor machine |
US11603833B2 (en) * | 2019-12-20 | 2023-03-14 | Arb Corporation Limited | Air compressors for use with a vehicle |
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EP1693569A1 (en) * | 2005-01-31 | 2006-08-23 | Black & Decker, Inc. | Cooling arrangement for a portable air compressor |
JP2007205207A (en) * | 2006-01-31 | 2007-08-16 | Hitachi Ltd | Reciprocating compressor |
EP1832749A1 (en) * | 2004-12-28 | 2007-09-12 | Max Co., Ltd. | Air compressor |
EP2006540A2 (en) * | 2007-06-19 | 2008-12-24 | Schneider Druckluft GmbH | Compressor device with a tensioning device |
US20090194177A1 (en) * | 2008-02-05 | 2009-08-06 | Hitachi Koki Co., Ltd. | Air compressor |
JP2013040586A (en) | 2011-08-18 | 2013-02-28 | Hitachi Koki Co Ltd | Air compressor |
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GB2314593B (en) * | 1996-06-28 | 1999-11-10 | Thomas Industries Inc | Two-cylinder air compressor |
JP5293995B2 (en) * | 2008-02-05 | 2013-09-18 | 日立工機株式会社 | air compressor |
-
2013
- 2013-09-18 JP JP2013193538A patent/JP2015059504A/en active Pending
-
2014
- 2014-08-17 US US14/461,413 patent/US20150078938A1/en not_active Abandoned
- 2014-08-18 EP EP14181256.0A patent/EP2853745A1/en not_active Withdrawn
- 2014-08-25 CN CN201410422954.1A patent/CN104454460A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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EP1832749A1 (en) * | 2004-12-28 | 2007-09-12 | Max Co., Ltd. | Air compressor |
EP1693569A1 (en) * | 2005-01-31 | 2006-08-23 | Black & Decker, Inc. | Cooling arrangement for a portable air compressor |
JP2007205207A (en) * | 2006-01-31 | 2007-08-16 | Hitachi Ltd | Reciprocating compressor |
EP2006540A2 (en) * | 2007-06-19 | 2008-12-24 | Schneider Druckluft GmbH | Compressor device with a tensioning device |
US20090194177A1 (en) * | 2008-02-05 | 2009-08-06 | Hitachi Koki Co., Ltd. | Air compressor |
JP2013040586A (en) | 2011-08-18 | 2013-02-28 | Hitachi Koki Co Ltd | Air compressor |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN108397370A (en) * | 2017-05-04 | 2018-08-14 | 广东温博节能环保科技有限公司 | Heat sinking formula permanent-magnetic variable-frequency air compressor |
Also Published As
Publication number | Publication date |
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JP2015059504A (en) | 2015-03-30 |
US20150078938A1 (en) | 2015-03-19 |
CN104454460A (en) | 2015-03-25 |
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