CN207111362U - A kind of oilless air compressor - Google Patents

Abstract

The utility model provides a kind of oilless air compressor, belongs to air compressor machine technical field.It solves the problems, such as existing oilless air compressor poor work stability.This oilless air compressor, including motor and fan blade, the end of motor is fixed with crankcase, two cylinder bodies are fixed with the lateral wall of crankcase, piston is provided with cylinder body, the motor shaft of motor is stretched into crankcase, and it is fixed with the bent axle of eccentric setting in motor shaft ends, bent axle is connected by link assembly with piston, the end of bent axle is fixed with eccentric shaft, and the eccentric shaft has identical axial line with motor shaft, and crankcase end face is stretched out in one end of eccentric shaft, fan blade is arranged on the outside of crankcase, and the end of eccentric shaft and the center of fan blade are fixedly connected with.The work of this oilless air compressor is more stable, and service life is higher.

Description

A kind of oilless air compressor

Technical field

The utility model belongs to air compressor machine technical field, is related to a kind of oilless air compressor.

Background technology

Oilless air compressor is to belong to minitype reciprocating piston formula compressor, when motor-driven compressor bent axle rotates, passes through company The transmission of bar, there is self-lubricating just to be moved reciprocatingly without adding the piston of any lubricant, by cylinder inner wall, cylinder head and work The swept volume that plug top surface is formed then can generating period change.Oilless air compressor according to the difference of number of cylinders, be divided into 2V, The models such as 3Y, 4V, 6Y, wherein 2V refer to that one end of motor has 2 cylinders, and 3Y refers to that one end of motor has 3 cylinders, 4V Referring to the both ends of motor all has 2 cylinders, and 6Y refers to that the both ends of motor all have 3 cylinders, when the number of cylinders of air compressor machine When more or to capacity requirement is relatively low, generally use such as documents (application number：201410105649.X) and it is right Than file (application number：201610489352.7) eccentric wheel, the company of piston are arranged on the motor shaft of the mounting structure in, i.e. motor Rod set is located on eccentric wheel, and certain structure is without bent axle, therefore center of the end of motor shaft directly with fan blade is connected, So that fan blade has preferable axiality with motor shaft, fan blade rotates also relatively stable.

But when the number of cylinders of air compressor machine is less and requires higher to capacity, it is necessary to which the exhaust for increasing cylinder is held Product, it is therefore desirable to increase the stroke of piston, that is, need to increase the eccentric distance of eccentric wheel, but also cover between connecting rod and eccentric wheel Bearing arrangement provided with larger diameter so that using eccentric wheel connection the volume of air compressor machine can be caused excessive, therefore work as air compressor machine The number of cylinders at one end or both ends is less, is needed such as 2V, 4V model air compressor machine, while when requiring higher to capacity using bent Axle construction, then need to use such as documents (application number：201520878040.6), (application number：201520441903.3) and (application number：201510935279.7) bent axle is connected on the motor shaft of the crankshaft structure in, i.e. motor, the connecting rod of piston directly covers It is located on bent axle.But also as shown in above-mentioned documents, need to be fixed on the end of bent axle using fan blade after bent axle, because Bent axle is fixed with the eccentric position of fan blade in this above-mentioned documents, the structure when fan blade is installed it is difficult to ensure that fan blade with The axiality of motor shaft, and easily it is in the presence of that fan blade is unstable during long-term use, simultaneously because during crank rotation Diameter range it is larger, therefore, it is difficult to stretch out crankcase, so fan blade needs to be directly installed on inside crankcase, then in bent axle Air inlet is opened up on case, the structure causes cooling air-flow caused by fan blade to be directly blown onto on the moving component inside crankcase, long Phase using that can cause moving component dust stratification, so as to serious wear occur, reduces service life.

For it is above-mentioned using fan blade rotation is unstable after bent axle the problem of, it is separately installed in addition during the common method in this area Fan blade, such as documents (application number：201510000529.8), by fan blade installed in the bottom of crankcase, while fan blade is difficult to Driven by motor shaft, it is therefore desirable to which independent motor drives fan blade, but this also there is air compressor machine and fan blade It is the problem of asynchronous work, i.e., in actual use, higher to cooling requirements during compressor operation, and drive the electricity of fan blade Machine once breaks down, then motor, crankcase, cylinder and the piston of air compressor machine main body are difficult to be radiated, fault rate High, serious meeting causes whole air compressor machine to be scrapped.

The content of the invention

The purpose of this utility model is above mentioned problem be present for existing technology, it is proposed that a kind of oilless air compressor, should The work of oilless air compressor is more stable, and service life is higher.

The purpose of this utility model can be realized by following technical proposal：A kind of oilless air compressor, including motor and wind Leaf, the end of the motor are fixed with crankcase, two cylinder bodies are fixed with the lateral wall of the crankcase, are provided with cylinder body Piston, the motor shaft of the motor are stretched into crankcase, and are fixed with the bent axle of eccentric setting, the bent axle in motor shaft ends It is connected by link assembly with piston, it is characterised in that the end of the bent axle is fixed with eccentric shaft, the eccentric shaft and motor Axle has identical axial line, and crankcase end face is stretched out in one end of the eccentric shaft, and the fan blade is arranged on the outside of crankcase, And the end of eccentric shaft and the center of fan blade are fixedly connected with.

The quantity of crankcase is fixed on one end of motor when being one, then symmetrically solid when the quantity of crankcase is two It is scheduled on the both ends of motor, band dynamic crankshaft rotates during electric motor starting, and the bent axle of eccentric setting is by link assembly piston in cylinder Move back and forth in vivo, realize gas compression, the synchronous drive fan blade rotation of the eccentric shaft being also secured on bent axle, so as to electricity Machine, crankcase, cylinder body, the link assembly of inside and piston are radiated, wherein due to eccentric shaft and the concentric setting of motor shaft, And the center of eccentric shaft and fan blade is fixed, therefore it can ensure that the fixed position of eccentric shaft and fan blade is located at motor shaft On axial line so that the installation of fan blade is more accurate, and when motor runs at high speed fan blade rotation it is more stable, while wind The run-in synchronism of leaf and motor ensure that the reliability of radiating, and the use of oilless air compressor can be improved during long-term use In the life-span, further, because bent axle is fixed by eccentric shaft and fan blade, and eccentric shaft and motor shaft are concentric, therefore can stretch Going out crankcase so that fan blade is arranged on the outside of crankcase, and also without the air intake opened up for fan blade air intake on crankcase Mouthful, thus cooling air-flow caused by fan blade will not enter crankcase inside, so as to avoid the impurities accumulations such as dust link assembly, On the internal moving parts such as bearing, the job stability and service life of oilless air compressor are improved.

In above-mentioned oilless air compressor, the inner of the eccentric shaft has connecting portion, is opened on the end face of the connecting portion Provided with connecting hole, the center line of the connecting hole is parallel with the axial line of eccentric shaft and eccentric setting, the end of the bent axle are inserted It is connected in the connecting hole of connecting portion and is fixed by screw lock.Eccentric shaft is connected by connecting portion with bent axle, is realized eccentric Eccentric setting between axle and bent axle, so as to reach the concentric setting of eccentric shaft and motor shaft so that the rotation of fan blade is more It is stable.

In above-mentioned oilless air compressor, there is at least one straight confined planes one, institute on the hole wall of the connecting hole Stating has at least one straight confined planes two, the end face of the bent axle and the bottom surface phase of connecting hole on the periphery wall of crankshaft end Against, and the confined planes two-phase of the confined planes one of connecting hole and bent axle reclines.Coordinated by confined planes one and confined planes two, realized It is circumferentially positioned between eccentric shaft and bent axle, while confined planes one and confined planes two determine the axiality of eccentric shaft and motor shaft, And confined planes one and confined planes two can machine in advance before the mounting, therefore the installation fixation of eccentric shaft is more accurate, enters And ensure the stability of fan blade rotation.

In above-mentioned oilless air compressor, the center of the fan blade offers fixing hole, and the eccentric shaft is hollow Axle, and the end of eccentric shaft passes through the fixing hole of fan blade and fixed by jump ring.I.e. the fixed position of fan blade is located at center, so as to Ensure the stability of fan blade rotation, and eccentric shaft uses hollow shaft structure, can reduce the deformation quantity for expanding with heat and contract with cold and bringing, so as to Improve the axiality of eccentric shaft and motor shaft.

In above-mentioned oilless air compressor, the crankcase is cylindrical, and the external diameter of the fan blade is more than the outer of crankcase Footpath.The external diameter of fan blade is larger, its caused cooling air-flow can along crankcase outer peripheral face and blow to motor end face, so as to right Motor has more preferable radiating effect, improves the stability of motor operation.

In above-mentioned oilless air compressor, the inner chamber of the crankcase and the intracavity inter-connection of cylinder body and the sky for forming closing Chamber, air admission hole is offered on the crankcase, venthole is offered on the cylinder body, is further opened with the end face of the crankcase Through hole, above-mentioned eccentric shaft passes through through hole, and sealing ring is provided between eccentric shaft and through hole hole wall.Air admission hole and outlet Hole is contracted for gas stream dynamic pressure, and sealing ring causes cooling air-flow caused by fan blade not enter inside crankcase, ensures bent axle The stability of case internal moving parts, while the cavity of crankcase and cylinder body inner sealing can also reduce internal moving parts operating Caused noise reduces noise during oilless air compressor work to external diffusion.

In above-mentioned oilless air compressor, the end of the motor is also fixed with shell, and above-mentioned crankcase is located at shell Inside, cooling air channel is formed between the inwall of the shell and the outer wall of crankcase, air intake is offered on the end face of the shell Mouthful, air vent that is some axially disposed and running through is offered on the cylinder body, some air vents are set around inner chamber of cylinder block, The air vent the inner be connected with cooling air channel, the fan blade be located at shell inner face and crankcase outer face it Between, circumferentially there is connection flange outside the both ends of the motor, there are some axially disposed length on the outer wall of motor Strip fin, and the both ends of fin extend respectively to two connection flange, one end that the shell is connected with motor is in opening Shape, above-mentioned cooling air channel are relative with connection flange.Shell is oriented to cooling air-flow caused by fan blade so that cooling air-flow edge Cooling air channel flowing, cooling air-flow can by air vent, so as to be cooled down to the part such as piston of cylinder body and inside, The stability and service life of the part such as cylinder body and piston are improved, while the cooling air-flow in cooling air channel can blow to motor Connection flange, so as to take away the heat on connection flange and fin, so as to being radiated to motor.

In above-mentioned oilless air compressor, positioning is offered along its length on the motor shaft ends outer wall of the motor Groove, the end of the bent axle have a balancing weight of plate-like, and mounting hole is axially offered along bent axle on the end face of the balancing weight, and The axially eccentric setting of the center line and bent axle of mounting hole, the motor shaft of the motor is plugged in the mounting hole of bent axle, described Positioning screw hole radially is offered along bent axle on the outer peripheral face of balancing weight, bolt is bolted with positioning screw hole, the positioning spiral shell The end grafting of bolt is positioned in locating slot.Passing through the cooperation of bolt and locating slot so that the fixation of bent axle is more stable, And the bent axle of steady running also make it that the rotation of fan blade is more stable.

In above-mentioned oilless air compressor, the bolt includes the positioning section of thread segment and outer peripheral face for straight tube face, The unthreaded hole section that the positioning screw hole includes screw hole section and medial surface is straight tube face, the unthreaded hole section are located at the inner of screw hole section, institute The thread segment for stating bolt is screwed onto in the screw hole section of positioning screw hole, and the end face of the positioning section is pressed on the bottom surface of locating slot On, the outer peripheral face of described positioning section one end and relative two cell walls of locating slot lean, and the outer peripheral face of the positioning section other end is with determining The unthreaded hole section inner peripheral surface interference fits of position screw.The end face of positioning section and the bottom surface of locating slot fit compression, realize to bent axle Axially position, and the cell wall of the outer peripheral face of positioning section and locating slot leans, and realizes to the circumferentially positioned of bent axle, and positioning section Outer peripheral face be straight tube face, be positioned directly in traditional bolt in locating slot, pass through the flank of bolt and the groove of locating slot Wall, which leans, realizes that positioning is compared, and straight tube face has higher structural stability, even if bent axle stress causes in use Positioning section outer peripheral face mutually extrudes with locating slot cell wall, and the outer peripheral face of positioning section is also not in deformation so that positioning section with Coordinate precisely all the time between locating slot, and then make it that the fixation of bent axle is more stable, avoid bent axle from going out during long-term use Now loosen, also ensure that the stable rotation of fan blade, likewise, the inner peripheral surface of unthreaded hole section is straight tube face, compare flank, straight tube Face has higher structural stability, so as to avoid the inner of positioning screw hole from deformation occur, ensures that positioning section coordinates with unthreaded hole section Precisely, stably, loosening is avoided the occurrence of, while outer peripheral face one end of positioning section is located in locating slot, the other end is located in unthreaded hole section, When by shearing force between bent axle and motor shaft, the dynamics that the outer peripheral face of positioning section straight-tube shape can be born is bigger, can The phenomenon for avoiding on screw thread-like face stress concentration between screw thread and being broken.

In above-mentioned oilless air compressor, circumferentially there is convex edge, the convex on the end face of the positioning section The cross section on edge is triangular in shape, bottom surface of the convex along embedded locating slot when the bolt is locked.Convex edge is embedded The bottom surface of locating slot, so as to increase the axial locating force to bent axle, wherein convex is along the circumferentially disposed of bolt, therefore The groove that convex forms annular along that can be extruded in positioning groove bottom in rotational lock bolt, and the shape of groove It is adapted with the shape on convex edge.

Compared with prior art, this oilless air compressor has advantages below：

1st, due to eccentric shaft and the concentric setting of motor shaft, and the center of eccentric shaft and fan blade is fixed, therefore energy Enough ensure that the fixed position of eccentric shaft and fan blade is located on the axial line of motor shaft, the rotation of fan blade is more when motor runs at high speed It is stable, while the run-in synchronism of fan blade and motor ensure that the reliability of radiating, and oil-free can be improved during long-term use The service life of air compressor machine.

2nd, because fan blade is located at the outside of crankcase, caused cooling air-flow will not enter inside crankcase, so as to avoid The impurities accumulations such as dust improve the job stability of oilless air compressor and made on the internal moving parts such as link assembly, bearing Use the life-span.

3rd, because the inner chamber of crankcase and cylinder body is closed, therefore noise caused by internal moving parts operating can be reduced To external diffusion, that is, reduce noise during oilless air compressor work.

4th, because the outer peripheral face of positioning section is straight tube face, there is higher structural stability, even if bent in use Axle stress causes positioning section outer peripheral face mutually to be extruded with locating slot cell wall, and the outer peripheral face of positioning section is also not in deformation, so that Obtain and coordinate precisely all the time between positioning section and locating slot, and then make it that the fixation of bent axle is more stable, avoid bent axle from making for a long time Loosened during, also ensure that the stable rotation of fan blade.

Brief description of the drawings

Fig. 1 is the Structure explosion diagram of oilless air compressor.

Fig. 2 is the lateral partial structurtes sectional view of oilless air compressor.

Fig. 3 is the structural representation of motor, bent axle, eccentric shaft and fan blade.

Fig. 4 is the structural side view of eccentric shaft.

Fig. 5 is the schematic enlarged-scale view at A in Fig. 2.

Fig. 6 is the lateral partial structurtes sectional view at bolt.

Fig. 7 is the partial structural diagram of bolt.

Fig. 8 is the structure sectional view at another visual angle of oilless air compressor

In figure, 1, motor；11st, motor shaft；12nd, locating slot；13rd, flange is connected；14th, fin；2nd, bent axle；21st, counterweight Block；22nd, mounting hole；23rd, positioning screw hole；231st, screw hole section；232nd, unthreaded hole section；24th, confined planes two；3rd, eccentric shaft；31st, connect Portion；32nd, connecting hole；33rd, confined planes one；4th, fan blade；41st, fixing hole；5th, bolt；51st, thread segment；52nd, positioning section；53、 Convex edge；6th, crankcase；61st, air admission hole；62nd, through hole；63rd, sealing ring；7th, cylinder body；71st, piston；72nd, link assembly； 73rd, venthole；74th, air vent；8th, shell；81st, cooling air channel；82nd, air inlet.

Embodiment

It is specific embodiment of the utility model and with reference to accompanying drawing below, the technical solution of the utility model is made further Description, but the utility model is not limited to these embodiments.

As shown in Figure 1 and Figure 2, a kind of oilless air compressor, including motor 1 and fan blade 4, the both ends of motor 1 are respectively and fixedly provided with bent axle Case 6, two cylinder bodies 7 is fixed with the lateral wall of crankcase 6, two cylinder bodies 7 are located at the top of crankcase 6, and two cylinders Body 7 is V-shaped symmetrical, is provided with piston 71 in cylinder body 7, the both ends of motor shaft 11 of motor 1 are respectively protruding into two crankcases 6 It is interior, bent axle 2, bent axle 2 and the eccentric setting of motor shaft 11 are fixed with the end of motor shaft 11, bent axle 2 is by link assembly 72 with living Plug 71 is connected.The end of bent axle 2 is fixed with eccentric shaft 3, and the eccentric shaft 3 has identical axial line with motor shaft 11, eccentric The end face of crankcase 6 is stretched out in one end of axle 3, and fan blade 4 is arranged on the outside of crankcase 6, and in the end of eccentric shaft 3 and fan blade 4 Heart position is fixedly connected with, i.e. the fixed position of eccentric shaft 3 and fan blade 4 is located on the axial line of motor shaft 11.

With reference to shown in Fig. 3, Fig. 4, the inner of eccentric shaft 3 has connecting portion 31, and connection is offered on the end face of connecting portion 31 Hole 32, the center line of the connecting hole 32 is parallel with the axial line of eccentric shaft 3 and eccentric setting, has on the hole wall of connecting hole 32 Two straight confined planes 1, there is two straight confined planes 2 24, the end of bent axle 2 on the periphery wall of the end of bent axle 2 It is plugged in the connecting hole 32 of connecting portion 31, the end face and the bottom surface of connecting hole 32 of bent axle 2 lean, and connecting hole 32 is spacing Face 1 and the phase of confined planes 2 24 of bent axle 2 are reclined, and connecting portion 31 is fixed with bent axle 2 by screw.Open the center of fan blade 4 Provided with fixing hole 41, eccentric shaft 3 is hollow shaft, and the end of eccentric shaft 3 passes through the fixing hole 41 of fan blade 4 and consolidated by jump ring It is fixed.With reference to shown in Fig. 5, Fig. 6, Fig. 7, locating slot 12, bent axle are offered along its length on the end outer wall of motor shaft 11 of motor 1 2 end has a balancing weight 21 of plate-like, and axially mounting hole 22, and mounting hole are offered along bent axle 2 on the end face of balancing weight 21 22 center line and the axially eccentric setting of bent axle 2, the motor shaft 11 of motor 1 are plugged in the mounting hole 22 of bent axle 2, balancing weight Positioning screw hole 23 is offered along the radial direction of bent axle 2 on 21 outer peripheral face, the inner of positioning screw hole 23 is connected with mounting hole 22, fixed Bolt 5 is bolted with the screw 23 of position, the end grafting of the bolt 5 is positioned in locating slot 12.Specifically, positioning spiral shell Bolt 5 includes thread segment 51 and positioning section 52, and the outer peripheral face of the positioning section 52 is straight tube face, on the end face of positioning section 52 circumferentially With convex along 53, the convex is triangular in shape along 53 cross section, and positioning screw hole 23 includes screw hole section 231 and unthreaded hole section 232, unthreaded hole section 232 is located at the inner of screw hole section 231, and the medial surface of unthreaded hole section 232 is straight tube face, the screw thread of bolt 5 Section 51 is screwed onto in the thread segment 51 of positioning screw hole 23, and one end of positioning section 52 of bolt 5 is located in unthreaded hole section 232, and fixed The position outer peripheral face of section 52 and the inner peripheral surface interference fits of unthreaded hole section 232, the locating slot 12 of the other end insertion motor shaft 11 of positioning section 52 It is interior, and relative two cell walls lean the outer peripheral face of positioning section 52 with locating slot 12, the positioning section 52 when bolt 5 is locked End face is pressed on the bottom surface of locating slot 12, and bottom surface of the convex along 53 insertion locating slots 12.

With reference to shown in Fig. 8, the both ends of motor 1 are fixed with shell 8, and crankcase 6 is located at the inside of shell 8, shell 8 it is interior Cooling air channel 81 is formed between the outer wall of wall and crankcase 6, circumferentially there is connection flange 13 outside the both ends of motor 1, in electricity There are some axially disposed strip fin 14, and the both ends of fin 14 extend respectively to two companies on the outer wall of machine 1 Flange 13 is connect, cooling air channel 81 is relative with being connected flange 13, and air vent that is some axially disposed and running through is offered on cylinder body 7 74, some air vents 74 are set around the inner chamber of cylinder body 7, and the inner of air vent 74 is connected with cooling air channel 81, the end of shell 8 Air inlet 82 is offered on face, fan blade 4 is located between the inner face of shell 8 and the outer face of crankcase 6, and crankcase 6 is in cylinder Shape, the external diameter of fan blade 4 are more than the external diameter of crankcase 6.The inner chamber of crankcase 6 and the intracavity inter-connection of cylinder body 7 simultaneously form closing Cavity, air admission hole 61 is offered on crankcase 6, venthole 73 is offered on cylinder body 7, is further opened with the end face of institute's crankcase 6 Through hole 62, eccentric shaft 3 passes through through hole 62, and sealing ring 63 is provided between eccentric shaft 3 and the hole wall of through hole 62.

Specific embodiment described herein is only to the utility model spirit explanation for example.The utility model institute Category those skilled in the art can make various modifications or supplement to described specific embodiment or using similar Mode substitute, but without departing from spirit of the present utility model or surmount scope defined in appended claims.

Although more having used the terms such as motor 1, motor shaft 11, locating slot 12 herein, it is not precluded from using other The possibility of term.It is used for the purpose of more easily describing and explaining essence of the present utility model using these terms；Them Any additional limitation is construed to all to disagree with the utility model spirit.

Claims (10)

1. a kind of oilless air compressor, including motor (1) and fan blade (4), the end of the motor (1) are fixed with crankcase (6), institute State and two cylinder bodies (7) are fixed with the lateral wall of crankcase (6), piston (71) is provided with cylinder body (7), the motor (1) Motor shaft (11) is stretched into crankcase (6), and is fixed with the bent axle (2) of eccentric setting, the bent axle in motor shaft (11) end (2) it is connected by link assembly (72) with piston (71), it is characterised in that the end of the bent axle (2) is fixed with eccentric shaft (3), the eccentric shaft (3) has identical axial line with motor shaft (11), and crankcase (6) is stretched out in one end of the eccentric shaft (3) End face, the fan blade (4) are arranged on the outside of crankcase (6), and the end of eccentric shaft (3) and the center phase of fan blade (4) It is connected.

2. oilless air compressor according to claim 1, it is characterised in that the inner of the eccentric shaft (3) has connecting portion (31) connecting hole (32), is offered on the end face of the connecting portion (31), center line and the eccentric shaft (3) of the connecting hole (32) Axial line is parallel and eccentric setting, the end of the bent axle (2) are plugged in the connecting hole (32) of connecting portion (31) and passed through Screw lock is fixed.

3. oilless air compressor according to claim 2, it is characterised in that have at least on the hole wall of the connecting hole (32) One straight confined planes one (33), there are at least one straight confined planes two on the periphery wall of bent axle (2) end (24), the end face of the bent axle (2) and the bottom surface of connecting hole (32) lean, and the confined planes one (33) of connecting hole (32) and song The confined planes two (24) of axle (2) mutually recline.

4. according to the oilless air compressor described in claim 1 or 2 or 3, it is characterised in that open the center of the fan blade (4) Provided with fixing hole (41), the eccentric shaft (3) is hollow shaft, and the end of eccentric shaft (3) passes through the fixing hole (41) of fan blade (4) And fixed by jump ring.

5. oilless air compressor according to claim 4, it is characterised in that the crankcase (6) is cylindrical, the fan blade (4) external diameter is more than the external diameter of crankcase (6).

6. according to the oilless air compressor described in claim 1 or 2 or 3, it is characterised in that the inner chamber of the crankcase (6) and cylinder The intracavity inter-connection of body (7) simultaneously forms the cavity of closing, and air admission hole (61), the cylinder body (7) are offered on the crankcase (6) On offer venthole (73), through hole (62) is further opened with the end face of the crankcase (6), above-mentioned eccentric shaft (3) passes through Through hole (62), and sealing ring (63) is provided between eccentric shaft (3) and through hole (62) hole wall.

7. oilless air compressor according to claim 6, it is characterised in that the end of the motor (1) is also fixed with shell (8), above-mentioned crankcase (6) is located at the inside of shell (8), is formed between the inwall of the shell (8) and the outer wall of crankcase (6) Cooling air channel (81), air inlet (82) is offered on the end face of the shell (8), is offered on the cylinder body (7) some along axle To the air vent (74) for setting and running through, some air vents (74) are set around cylinder body (7) inner chamber, the air vent (74) The inner be connected with cooling air channel (81), the fan blade (4) be located at shell (8) inner face and crankcase (6) outer face it Between, circumferentially there is connection flange (13) outside the both ends of the motor (1), have on the outer wall of motor (1) some along axle To the strip fin (14) of setting, and the both ends of fin (14) extend respectively to two connection flange (13), the shell (8) one end being connected with motor (1) is opening-like, and above-mentioned cooling air channel (81) is relative with being connected flange (13).

8. according to the oilless air compressor described in claim 1 or 2 or 3, it is characterised in that the motor shaft (11) of the motor (1) Locating slot (12) is offered on the outer wall of end along its length, the end of the bent axle (2) has the balancing weight (21) of plate-like, institute State and axially offer mounting hole (22), and the center line and bent axle of mounting hole (22) along bent axle (2) on the end face of balancing weight (21) (2) axially eccentric setting, the motor shaft (11) of the motor (1) are plugged in the mounting hole (22) of bent axle (2), the counterweight Positioning screw hole (23) is radially offered along bent axle (2) on the outer peripheral face of block (21), positioning spiral shell is bolted with positioning screw hole (23) Bolt (5), the end grafting of the bolt (5) are positioned in locating slot (12).

9. oilless air compressor according to claim 8, it is characterised in that the bolt (5) includes thread segment (51) With the positioning section (52) that outer peripheral face is straight tube face, it is straight tube face that the positioning screw hole (23), which includes screw hole section (231) and medial surface, Unthreaded hole section (232), the unthreaded hole section (232) is located at the inner of screw hole section (231), the thread segment of the bolt (5) (51) it is screwed onto in the screw hole section (231) of positioning screw hole (23), the end face of the positioning section (52) is pressed on locating slot (12) On bottom surface, relative two cell walls lean the outer peripheral face of described positioning section (52) one end with locating slot (12), and positioning section (52) is another The outer peripheral face of one end and unthreaded hole section (232) inner peripheral surface interference fits of positioning screw hole (23).

10. oilless air compressor according to claim 9, it is characterised in that on the end face of the positioning section (52) circumferentially With convex along (53), the convex is triangular in shape along the cross section of (53), is positioned when the bolt (5) is locked The bottom surface of the embedded locating slot (12) in convex edge (53).