JP6266413B2 - Air compressor - Google Patents

Description

  The present invention relates to an air compressor for generating compressed air to be a driving source of an air tool such as a compressed air driving tool.

  As an electric air compressor using an electric motor as a driving source, a reciprocating type and a scroll type are known as a principle of generating compressed air. The prior art regarding the former reciprocating type air compressor is disclosed in the following patent documents. Since the reciprocating air compressor has a piston that reciprocates in the cylinder, torque pulsation becomes relatively large. As a result, the reciprocating type air compressor has problems of large vibration and noise and difficulty in downsizing the apparatus.

  On the other hand, in the case of the latter scroll type compressor, since there is no configuration for generating compressed air by reciprocating the piston in the cylinder as in the reciprocating type, vibration and noise are small as a result of relatively small torque pulsation. Has the advantage. In addition, the scroll compressor has a feature that it is easy to obtain a large discharge amount because of its volumetric efficiency.

JP-A-1-142283

  Conventionally, a scroll-type air compressor that is small in vibration and noise and can be downsized has not been provided with a portability excellent enough to be worn and carried by a user of the air tool. An object of this invention is to provide the scroll type air compressor excellent in portability.

  Said subject is solved by each following invention. According to a first aspect of the present invention, there is provided a compressor main body having a scroll-type air generating section for generating compressed air by rotating the movable scroll with respect to the fixed scroll using the electric motor as a drive source, and the compressor main body is used. It is an air compressor equipped with a tool for a person to wear and carry.

  According to the first invention, the user can carry the compressor main body, for example, on the back, hanging on the shoulder, or hanging on the waist. In this respect, the portability of the air compressor can be improved. . As the “wearing tool”, a backpack-type back belt, shoulder belt, stool belt, or the like can be used. The compressor body can be carried on the back by using the back belt, the compressor body can be carried on the shoulder by using the shoulder belt, and the compressor body can be hung on the waist by using the waist belt. Can be carried in a lowered state.

  In this way, since the compressor body can be worn with a wearable tool and can be carried empty-handed with both hands open, work with a hand-held tool such as a driving tool using compressed air as the drive source can be performed efficiently with both hands. In this respect, the usability of the air compressor and thus the hand-held air tool can be improved.

  It is good also as a structure provided with the hook part as an attachment tool. By hooking the hook portion on the trouser belt of the user, the compressor body can be carried with the waist suspended from the waist. The wearable tool in the first invention is not a means for the user to carry the compressor body by hand, but can be carried on the user's back, waist, etc., and can be carried empty-handed with both hands open. It can be defined as having a function to enable (carrying).

  A second invention is the air compressor according to the first invention, wherein the compressor main body has a tankless structure in which the compressed air generated by the air generating unit is directly output to the outside through the air hose. According to the second invention, since the storage tank for temporarily storing the generated compressed air is omitted, the compressor body can be reduced in weight by that amount. Can improve the portability to wear and carry.

  A 3rd invention is an air compressor which can attach a rechargeable battery as a power supply of a compressor body in the 1st or 2nd invention. According to the third invention, the portability of the air compressor can be further enhanced by the cordless compressor having no power cord as in the case of using an AC power source.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the compressor body is an air compressor including a brushless motor as an electric motor. According to the fourth aspect of the invention, the compressor body can be made compact (downsized) particularly in the machine length direction (motor axial direction), and the portability can be further enhanced in this respect.

  According to a fifth invention, in any one of the first to fourth inventions, the compressor body is an air compressor provided with an outer rotor motor having a stator on the inner peripheral side of the rotor as an electric motor. According to the fifth aspect of the invention, it is possible to further reduce the weight and noise of the compressor body by omitting the reduction gear train by utilizing the advantage of the outer rotor motor capable of outputting low speed and high torque. Portability can be further enhanced.

  According to a sixth aspect of the invention, in any one of the first to fifth aspects of the invention, the compressor body includes a scroll-type air generation portion housed in a cylindrical body housing, and the air generation portion is disposed in the body housing. The air compressor is configured to occupy the largest space in the radial direction. According to the sixth aspect of the invention, the radial compression of the compressor main body is achieved while giving priority to the radial size of the scroll-type air generating portion determined from the viewpoint of securing the discharge force necessary for the air compressor. Can do.

  7th invention is an air compressor which provided the ventilation path between the main body housing and the air production | generation part in any one invention of 1st-6th. According to the seventh aspect, the air generating unit is efficiently cooled.

  In an eighth invention according to any one of the first to seventh inventions, a controller for controlling the operation of the electric motor, a cooling fan, an electric motor, and an air generating unit are sequentially arranged in series in the main body housing. In the main body housing, the air compressor is provided with an intake hole around the controller and an exhaust hole around the air generating unit. According to the eighth aspect, the controller, the electric motor, and the air generation unit can be efficiently cooled.

  A ninth invention is the air compressor according to the eighth invention, wherein a dustproof filter is provided in the intake hole. According to the ninth aspect of the present invention, it is possible to prevent foreign matter from entering the main body housing, thereby preventing the foreign matter from getting caught in the scroll type air generating portion.

  A tenth aspect of the present invention is the air compressor according to any one of the first to ninth aspects, wherein the hose connecting portion for connecting the output air hose is positioned on the opposite side to the user and is worn. It is. According to the tenth aspect of the invention, it is possible to make it difficult for a user carrying the air compressor to carry the influence of heat generated by the scroll type air generation unit and released through the hose connection unit, Thereby, the usability of the air compressor can be improved.

  An eleventh aspect of the present invention is the air compressor according to any one of the first to tenth aspects, wherein the air generating part is provided with an oiling port for lubricating the air generating part. According to the eleventh aspect, by forming an oil film between the fixed scroll and the movable scroll, it is possible to improve the air tightness of the air generating section, thereby increasing the efficiency of the air compressor and its durability. Can be increased. In addition, oil can be included in the compressed air generated by lubricating the air generating unit, thereby ensuring a smooth operation for the air tool that uses the compressed air as a drive source, and its durability. Can be increased. According to the eleventh aspect of the invention, since lubricating oil (turbine oil) can be directly dropped onto the air generating portion via the oil filling port and lubricated, the above-described effects can be obtained with a simple configuration.

  A twelfth aspect of the invention is an air compressor including an oiling tank for lubricating the air generating part in any one of the first to tenth aspects of the invention. According to the twelfth invention, as in the eleventh invention, the air-tightness of the air generating portion can be increased by lubricating the fixed scroll and the movable scroll, and consequently the efficiency and durability of the air compressor are increased. be able to. In addition, oil can be included in the compressed air generated by lubricating the air generating unit, thereby ensuring a smooth operation for the air tool that uses the compressed air as a drive source, and its durability. Can be increased. According to the twelfth aspect of the invention, the lubricating oil stored in the oil supply tank is appropriately supplied to the air generator.

It is a whole perspective view of the air compressor concerning this embodiment. It is a right view of the air compressor concerning this embodiment. It is the top view which looked at the air compressor concerning this embodiment from arrow (III) direction in FIG. FIG. 4 is a sectional view taken along the line (IV)-(IV) in FIG. 3, and is a longitudinal sectional view of the air compressor according to the present embodiment. FIG. 4 is a sectional view taken along the line (V)-(V) in FIG. 3, and is a longitudinal sectional view of the air compressor according to the present embodiment. FIG. 6 is a cross-sectional view taken along line (VI)-(VI) in FIG. 5, and is a cross-sectional view of the air compressor according to the present embodiment. It is a cross-sectional view of an air compressor. This figure has shown the air production | generation part which concerns on 2nd Embodiment provided with the oil inlet. It is a longitudinal cross-sectional view of an air compressor. This figure has shown the air production | generation part which concerns on 3rd Embodiment provided with the oil supply tank. It is a top view of the state which removed the main body housing of the air compressor. It is a front view of the air compressor which attached the shoulder belt. It is a side view which shows the state in which the user carried the air compressor.

  Next, an embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, the air compressor CP of the present embodiment has a generally cylindrical outer appearance, a lightweight and compact electric compressor body 1, and a user who wears the compressor body 1. It is equipped with an “Equipment” for carrying with you. The compressor main body 1 has a function of supplying compressed air as a drive source to an air tool T such as a compressed air driven nail driver used by a user.

  A battery mounting portion 3 is provided on the lower surface of the compressor body 1. A rechargeable battery pack (secondary battery) 2 is attached to the battery attachment portion 3. The compressor body 1 operates using the battery pack 2 as a power source. The battery pack 2 is a lithium ion battery (18 V) that can be used as a battery for rechargeable electric tools such as screwing machines and cutting tools. The battery pack 2 can be repeatedly used by being removed and charged with a separately prepared charger. The battery pack 2 is attached to the battery attachment portion 3 by sliding from the front side to the back side, and can be removed by sliding from the back side to the front side.

  The compressor body 1 is a scroll type compressor, and its internal structure is shown in FIGS. The compressor main body 1 has a configuration in which a controller 11, a cooling fan 12, an electric motor 13, and an air generation unit 20 are arranged in series in a cylindrical main body housing 10 in order from the lower side. The cooling fan 12, the electric motor 13, and the air generation unit 20 constitute a mechanism unit 4 that is assembled through an upper mechanism base 15 and a lower mechanism base 14 that are coupled to each other.

  The controller 11 has a configuration in which substrates such as a power supply control circuit for the battery pack 2 and a control circuit for the electric motor 13 are accommodated in a shallow case. The controller 11 is fixed to the bottom of the main body housing 10. A cooling fan 12 is located above the controller 11. The cooling fan 12 is attached to the output shaft 13 a of the electric motor 13.

  The electric motor 13 is an outer rotor type brushless motor, and includes a stator 13c on the inner peripheral side of the rotor 13b. A cylindrical holder 17 is attached to the rotor 13b. An output shaft 13 a is fixed to the center of the holder 17. The output shaft 13a is rotatably supported by the lower mechanism base 14 via a lower bearing 14a and an upper bearing 14b. A needle bearing is used for the lower bearing 14a, and a ball bearing is used for the upper bearing 14b. The stator 13 c is fixed to the lower surface side boss portion 14 c of the lower mechanism base 14.

  An eccentric hole 13d is provided in the upper part of the output shaft 13a. The movable side scroll (spiral member) 21 of the scroll type air generating unit is rotatably supported in the eccentric hole 13d. A fixed scroll 22 is arranged on the upper side facing the movable scroll 21. The fixed scroll 22 is fixed to the upper mechanism base 15. As the output shaft 13a rotates, the movable scroll 21 pivots with respect to the fixed scroll 22 to generate compressed air. The generated compressed air is discharged to the air chamber 24 through a discharge port 22 a provided at the center of the fixed scroll 22. A check valve 23 is attached to the discharge port 22a. A hose connection portion 26 is connected to the air chamber 24 via a discharge pipe 25. A pressure gauge 27 is attached to the air chamber 24. With the pressure gauge 27, the air pressure of the compressed air to be discharged can be confirmed.

  On the lower side of the main body housing 10, intake ports 10 a to 10 a for introducing outside air (cooling air) into the inside are provided. Exhaust ports 10 b to 10 b for discharging the introduced outside air to the outside are provided on the upper side of the main body housing 10. As shown in the figure, the intake ports 10 a to 10 a and the exhaust ports 10 b to 10 b are slit-shaped through grooves that are long in the vertical direction, and are arranged in parallel along the periphery of the main body housing 10. As shown in FIGS. 4 and 5, the intake ports 10 a to 10 a are arranged around the controller 11 and the cooling fan 12. The exhaust ports 10 b to 10 b are arranged around the air generation unit 20. When the cooling fan 12 rotates together with the start of the electric motor 13, outside air is sucked into the main body housing 10 through the intake ports 10 a to 10 a. The sucked outside air is blown onto the rotor 13b and the stator 13c of the electric motor 13 by the cooling fan 12 to be cooled. The holder 17 is provided with a plurality of ventilation holes 17a to 17a.

  The cooling air flowing upward from the intake ports 10 a to 10 a by the cooling fan 12 is exhausted to the outside from the exhaust ports 10 b to 10 b through the outer peripheral side of the lower mechanism base 14 and the outer peripheral side of the air generating unit 20. On the outer periphery of the air generation unit 20, a sufficient gap (ventilation passages 15 b to 15 b) is formed between the main body housing 10 and the cooling air to pass therethrough so that a large ventilation resistance is not generated. Thus, the smooth exhaust through the exhaust ports 10b to 10b is performed.

  As shown in FIGS. 6 and 9, the upper mechanism base 15 is provided with support convex portions 15 a to 15 a that project radially from the surrounding quadrant position. A ventilation passage 15b is formed between the adjacent support convex portions 15a, 15a of the upper mechanism base 15. Each ventilation path 15 b is located between the outer peripheral side of the air generation unit 20 and the exhaust ports 10 b to 10 b of the main body housing 10. The cooling air (outside air) introduced from the intake ports 10a to 10a by the rotation of the cooling fan 12 flows upward in the main body housing 10, and then is smoothly discharged from the exhaust ports 10b to 10b through the ventilation paths 15b to 15b. The

  The radial size of the air generation unit 20 (the movable scroll 21 and the fixed scroll 22) has a size necessary for obtaining a necessary discharge amount. In the mechanism unit 4, the air generation unit 20 occupies the largest space in the radial size. For this reason, the radial sizes of the cooling fan 12, the electric motor 13, and the upper and lower mechanism bases 14, 15 are all equal to or smaller than the air generation unit 20. As a result, the mechanism unit 4 and thus the size of the compressor body 1 in the radial direction are made compact while ensuring the necessary discharge amount.

  A pair of left and right belt hooks 18, 18 are provided on the upper portion of the main body housing 10. As shown in FIG. 10, a shoulder belt 19 for a shoulder is attached to the belt hooks 18 and 18 as an example of an accessory for a user to wear the compressor body 1 and carry it. it can. The user can carry the compressor body 1 with his shoulders on the shoulder and carry it with his hands open, so that the user can efficiently hold the air tool T with both hands. be able to.

Further, in the case of a portable air compressor, at least one hand is blocked during carrying, and it is necessary to install it on a stable floor surface during work. In the case of the air compressor 1 according to the present embodiment, both hands are used. Since the compressor main body 1 can be carried in the empty-handed state and can be driven in as it is, workability and handleability can be greatly improved compared to a portable air compressor.
As shown in FIG. 3, a power switch 28 and an operation indicator lamp 29 are disposed on the upper surface of the compressor body 1 in addition to the pressure gauge 27 described above.

  According to the air compressor CP of the present embodiment configured as described above, the user can carry the compressor main body 1 on the shoulder by using the shoulder belt 19 while the hands are empty. In addition, since the work can be performed using the air tool T with both hands while the compressor body 1 is placed on the shoulder, a reliable work can be efficiently performed.

  The illustrated compressor body 1 includes a scroll-type air generation unit 20 that discharges compressed air by rotating the movable scroll 21 with respect to the fixed scroll 22, and thus has low vibration and low noise. Since the volumetric efficiency is higher than that of the reciprocating type, compactness can be easily achieved. Also in this respect, portability when the user wears and carries it is enhanced.

  Various modifications can be made to the embodiments exemplified above. For example, a configuration in which the compressor main body 1 is hung on the shoulder using the shoulder belt 19 and carried is illustrated. However, the compressor main body 1 is suspended from the waist by attaching a waist belt instead of the shoulder belt 19. It is good also as a portable structure.

  Further, instead of the shoulder belt 19 and the waist belt, for example, a hook may be attached to the belt hanging portion 18 and the compressor main body 1 may be hooked on the belt of the work pants through this hook and carried in a hand-held state.

  Furthermore, as shown in FIG. 11, the compressor main body 1 can be carried with the back of the compressor main body 1 on the back by attaching a shoulder belt 30 as an attachment to the compressor main body 1. The shoulder belt 30 includes a back rest portion 31, shoulder belt portions 32 and 32, and a waist belt portion 33. The back rest 31 is provided with main body fixing belts 31 a and 31 a for holding the compressor main body 1. The upper and lower body fixing belts 31 a and 31 a can hold the compressor body 1 along the rear surface of the backrest portion 31. In this case, as shown in FIG. 11, the compressor main body 1 is fixed to the backrest 31 with the hose connection portion 26 facing back, so that the influence of heat generated by the air generator 20 or the like when the user carries the back. Can be difficult to receive on the back.

  The upper side of the shoulder belt portions 32, 32 is coupled to the left and right upper portions of the backrest portion 31. The lower side of the left and right shoulder belt portions 32, 32 is coupled to the left and right upper portions of the waist belt portion 33. The waist belt portion 33 can be fixed along the waist by tightening the buckle portion 33a. The user can carry the compressor body 1 on the back by using the shoulder belt 30.

  Further, by carrying the compressor body 1 on the back using the shoulder belt 30 as an attachment, the workability can be further improved as compared with the case of carrying the shoulder belt 19.

  The compressor body 1 exemplified above can be further modified. FIG. 7 shows a compressor body according to the second embodiment provided with an oil inlet 10c for oiling the air generating unit 20. FIG. 8 also shows the main body of the compressor according to the third embodiment provided with an oil tank 34 for lubricating the air generator 20. The members and configurations that do not need to be changed are denoted by the same reference numerals and the description thereof is omitted.

  As shown in FIG. 7, the compressor main body 1 according to the second embodiment includes an oil inlet 10c on a side portion thereof. An oil nozzle 10d is attached to the oil inlet 10c. The tip end side of the oil supply nozzle 10d reaches the fixed side scroll 22 of the air generating unit 20. Lubricating oil (turbine oil) injected through the injection port 10c is dripped mainly onto the wall surface of the fixed scroll 22 through the injection nozzle 10d. The dropped lubricating oil spreads on the wall surfaces of the movable scroll 21 and the fixed scroll 22 by the rotation of the movable scroll 21 to form an oil film. Thereby, the airtightness between the movable side scroll 21 and the fixed side scroll 22 can be improved, and air generation efficiency can be improved. Further, since the friction caused by the sliding contact of the movable scroll 21 with respect to the fixed scroll 22 is reduced, the air generation efficiency can also be improved in this respect.

  In addition, when sufficient lubricating oil is injected into the air generation unit 20 through the injection port 10c, an oil film of the lubricating oil is formed on the wall surfaces of the movable scroll 21 and the fixed scroll 22, and the generated compressed air Can contain an appropriate amount of oil. By supplying (lubricating) compressed air containing an appropriate oil component to the air tool through the air hose, the air tool can be smoothly operated and its durability can be enhanced.

  An oil tank 34 can be provided instead of the oil inlet 10c. FIG. 8 shows the compressor body 1 according to the third embodiment provided with an oil tank 34. As in the second embodiment, members and configurations that do not require modification are denoted by the same reference numerals and description thereof is omitted. In the third embodiment, the oil tank 34 is attached to the inside of the side portion of the main body housing 10. Lubricating oil (turbine oil) can be replenished to the oil supply tank 34 through a replenishing port 34 a provided on the side of the main body housing 10. An oil supply nozzle 34 b is attached to the upper surface of the oil supply tank 34. The tip end side of the oil supply nozzle 34b is connected to an oil supply hole 34c provided in the side portion of the fixed scroll 22 of the air generating unit 20. The lubricating oil replenished from the replenishing port 34 a to the oil supply tank 34 is automatically dropped between the movable scroll 21 and the fixed scroll 22 through the oil supply nozzle 34 b.

  The dropped lubricating oil spreads on the wall surfaces of the movable scroll 21 and the fixed scroll 22 by the rotation of the movable scroll 21 as in the second embodiment, and an oil film is formed. Thereby, the airtightness between the movable side scroll 21 and the fixed side scroll 22 can be improved, and air generation efficiency can be improved. Further, friction due to sliding contact of the movable scroll 21 with respect to the fixed scroll 22 is reduced and smooth air generation is performed, and compressed air containing appropriate oil is supplied to the air tool via the air hose. Smooth operation of the air tool can be realized, and its durability can be enhanced.

  In the second and third embodiments described above, the lubrication nozzles 10d and 34b are branched so that the bearing sleeves 14a and 14b and the bearing sleeve attached to the eccentric hole 13d and the lower surface of the movable scroll 21 are added to the air generating unit 20. It is good also as a structure which lubricates with respect to the thrust bearing with which the side was mounted | worn.

  In the first to third embodiments exemplified above, the configuration using the rechargeable battery as the power source is illustrated, but the present invention can be similarly applied to the case where the AC power source is used as the power source. When an AC power source is used as a power source, it can be used as a stationary air compressor, not a portable type using an attachment such as a belt on the back.

CP ... Air compressor 1 ... Compressor body (scroll type)
2 ... Battery pack 3 ... Battery mounting part 4 ... Mechanism part 10 ... Main body housing 10a ... Intake port, 10b ... Exhaust port, 10c ... Lubricating port, 10d ... Lubricating nozzle 11 ... Controller 12 ... Cooling fan 13 ... Electric motor 13a ... Output Shaft, 13b ... Rotor, 13c ... Stator, 13d ... Eccentric hole 14 ... Lower mechanism base, 14a, 14b ... Bearing, 14c ... Lower side boss 15 ... Upper mechanism base, 15a ... Supporting convex part, 15b ... Ventilation Road 17 ... Holder 17a ... Ventilation hole 18 ... Belt hook 19 ... Shoulder belt (attachment)
DESCRIPTION OF SYMBOLS 20 ... Air generation part 21 ... Movable side scroll 22 ... Fixed side scroll, 22a ... Discharge port 23 ... Check valve 24 ... Air chamber 25 ... Discharge pipe 26 ... Hose connection part 27 ... Pressure gauge 28 ... Power switch 29 ... Operation display Light 30 ... Shoulder belt (equipment)
31 ... Back support part, 31a ... Body fixing belt 32 ... Shoulder belt part 33 ... Waist belt part, 33a ... Buckle part 34 ... Lubrication tank 34a ... Replenishment port, 34b ... Lubrication nozzle, 34c ... Lubrication hole T ... Air tool

Claims (12)

A compressor main body having a scroll-type air generating unit that generates compressed air by rotating the movable side scroll with respect to the fixed side scroll using an electric motor as a drive source, and the user wearing the compressor main body An air compressor equipped with an accessory for carrying ,
An air compressor in which a controller for controlling the operation of the electric motor, a cooling fan, the electric motor, and the air generator are sequentially arranged in a cylindrical body housing . 2. The air compressor according to claim 1, wherein the compressor main body has a tankless structure in which compressed air generated by the air generation unit is directly output to the outside through an air hose. The air compressor according to claim 1 or 2, wherein a rechargeable battery can be attached as a power source of the compressor body. The air compressor according to any one of claims 1 to 3, wherein the compressor body includes a brushless motor as the electric motor. 5. The air compressor according to claim 1, wherein the compressor body includes an outer rotor motor having a stator on an inner peripheral side of a rotor as the electric motor. A air compressor as set forth in claim 1, wherein the compressor main body, the and air generating unit of the scroll in the body housing is accommodated, wherein the said air generator body housing An air compressor that occupies the largest space in the radial direction. The air compressor according to claim 6, wherein an air passage is provided between the main body housing and the air generating unit. The air compressor according to claim 7, wherein the main body housing includes an intake hole around the controller and an exhaust hole around the air generation unit. 9. The air compressor according to claim 8, wherein a dustproof filter is provided in the intake hole. The air compressor according to any one of claims 1 to 9, wherein a hose connection part for connecting an output air hose is positioned on a side opposite to a user and worn. . It is an air compressor given in any 1 paragraph of Claims 1-10, Comprising: The air compressor provided with the oiling mouth for oiling to the air generation part. It is an air compressor given in any 1 paragraph of Claims 1-10, Comprising: The air compressor provided with the oil supply tank for lubricating the air generation part.

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