CN110905763B

CN110905763B - Air compressor machine of variable stroke

Info

Publication number: CN110905763B
Application number: CN201911018219.3A
Authority: CN
Inventors: 张涛
Original assignee: Zhejiang Tengjing Air Compressor Co ltd
Current assignee: Zhejiang Tengjing Air Compressor Co ltd
Priority date: 2019-10-24
Filing date: 2019-10-24
Publication date: 2021-07-20
Anticipated expiration: 2039-10-24
Also published as: CN110905763A

Abstract

The invention discloses a stroke-variable air compressor, and relates to vacuum equipment, and the technical scheme is as follows: including shell, cylinder, piston, motor, by motor drive pivoted pivot, skew axis is equipped with the eccentric shaft in the pivot, the end fixing of pivot has the fixing base, the eccentric shaft slides and sets up on the fixing base, the slip direction of eccentric shaft is radial along the pivot, the fixing base internal rotation is provided with the lead screw, the axial of lead screw is along the slip direction of eccentric shaft, the lead screw pass the eccentric shaft and with eccentric shaft threaded connection, the tip that the lead screw deviates from the fixing base sets firmly and supplies screwdriver pivoted to twist the head, the shell is equipped with the perforation that supplies the screwdriver to penetrate, the fixing base can be through rotating, make the perforation just to twisting the head. The air compressor can conveniently adjust the stroke of the piston to adapt to the air using speed of the air tank, the air compressor does not need to be started or stopped frequently during working, and the air compressor is not easy to damage; the personnel need not this air compressor machine of dismouting when adjusting the piston stroke, and the eccentric shaft steadiness after adjusting the completion is high.

Description

Air compressor machine of variable stroke

Technical Field

The invention relates to vacuum equipment, in particular to a stroke-variable air compressor.

Background

Air compressors are vacuum devices for compressing air, and are classified into reciprocating piston type air compressors, impeller type air compressors, screw type air compressors and the like according to different working principles, wherein the reciprocating piston type air compressors are the most common air compressors.

The current chinese utility model patent that the bulletin number is CN203939650U of granting discloses an oil-free air compressor, including motor and cylinder, be equipped with the bent axle rather than being connected on the output shaft of motor, be equipped with the connecting rod on the bent axle, be equipped with the piston in the cylinder, connecting rod and piston interlock are equipped with two output shafts on the motor, and the bent axle includes first bent axle and second bent axle, and the cylinder includes first cylinder and second cylinder, is equipped with the connecting pipe between first cylinder and the second cylinder and just passes through the connecting pipe intercommunication. And valve plates are arranged in the first cylinder and the second cylinder respectively, an air inlet hole and an air outlet hole are arranged on the valve plates, and one-way valve plates are arranged at the air inlet hole and the air outlet hole respectively.

Air compressed by the air compressor is generally supplied to and stored in an air tank, and the air tank is communicated with an air outlet pipe to supply compressed air to personnel or equipment. When the air pressure in the air tank rises to a certain value, the air compressor stops working; when the air pressure in the air tank is reduced to a certain value after the air in the air tank is consumed, the air compressor is restarted to compress air. The start and stop of the air compressor are automatically controlled by a chip or a PLC.

The above prior art solution has the following drawbacks: the existing air compressor is generally driven by a motor with a fixed rotating speed to work, and the efficiency of compressing air is not changed when the air compressor works. In the manufacturing industry of standardized production, the gas velocity of each gas tank when normal use is comparatively even, but the efficiency of calming anger of air compressor machine is difficult to match the gas velocity of gas tank, leads to the air compressor machine during operation to need frequently to open and stop, and the start-up is in the twinkling of an eye great to the impact of the spare part of air compressor machine especially sealing member, also unfavorable to lubricated the establishment, and the air compressor machine damages easily.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the stroke-variable air compressor, which can adjust the stroke of a piston, does not need to be started or stopped frequently during working and is not easy to damage.

The technical purpose of the invention is realized by the following technical scheme: a variable stroke air compressor comprises a shell, a cylinder, a piston, a motor and a rotating shaft driven by the motor to rotate, wherein an eccentric shaft is arranged on the rotating shaft in a deviation manner from the axis, the piston and the eccentric shaft are connected through a connecting rod arranged between the piston and the eccentric shaft, and two ends of the connecting rod are respectively connected with the eccentric shaft and the piston in a rotating manner;

the end part of the rotating shaft is fixedly provided with a fixed seat, the eccentric shaft is arranged on the fixed seat in a sliding manner, the sliding direction of the eccentric shaft is radial along the rotating shaft, a screw rod is arranged in the fixed seat in a rotating manner, the axial direction of the screw rod is along the sliding direction of the eccentric shaft, the screw rod penetrates through the eccentric shaft and is in threaded connection with the eccentric shaft, the end part of the screw rod, which deviates from the fixed seat, is fixedly provided with a twisting head for a screwdriver to rotate, the shell is provided with a through hole for the screwdriver to penetrate through, and the fixed seat can rotate to enable the through hole to be just opposite to the twisting head.

Through above-mentioned technical scheme, when adjusting the stroke of air compressor machine, must break the pipeline of air compressor machine gas vent, make the compression chamber in the cylinder and outside air intercommunication. The tool of regulation is the screwdriver, and personnel penetrate the perforation with the head of screwdriver, stir the fixing base with the head of screwdriver and rotate. When the fixing seat rotates until the screw head is opposite to the through hole, a person inserts the head of the screwdriver into the screw head, the screw rod is driven to rotate in a mode of rotating the screwdriver, the eccentric shaft is driven to move along the sliding groove by the screw rod, and the piston is self-adaptively lifted in the cylinder in the moving process of the eccentric shaft. And after the screw rod is screwed for a certain number of turns, the personnel take out the screwdriver to complete the adjustment of the position of the eccentric shaft.

Because the distance of the eccentric shaft deviating from the axis of the rotating shaft is changed, the stroke of the piston is changed when the eccentric shaft rotates, and the air pressing quantity of the piston is changed along with the rotation of the rotating shaft in each circle. Personnel can adjust the stroke of piston through this mode, make the speed of calming the anger of air compressor machine and the gas rate of gas pitcher keep level basically, then the air compressor machine during operation need not frequently to open and stop, and the air compressor machine is not fragile.

Preferably, the fixing seat is provided with a sliding groove for slidably connecting the eccentric shaft, the sliding groove penetrates through the fixing seat to the direction deviating from the rotating shaft to form a notch, the notch of the sliding groove is in a necking shape, the eccentric shaft comprises an integrally fixed sliding block, the eccentric shaft is in threaded connection with the lead screw through the sliding block, the sliding block is in sliding connection with the sliding groove, and the sliding block cannot be separated from the sliding groove from the notch of the sliding groove.

Through above-mentioned technical scheme, the eccentric shaft can not break away from the fixing base from the notch of spout, and the eccentric shaft is high along the gliding stability of spout.

Preferably, the one end of spout runs through the circumference outer wall of fixing base, the annular has been seted up along circumference to the outer wall of lead screw, there are two to rotate a seat one, two through the bolt fastening on the fixing base rotate a radial symmetry about the lead screw, it is equipped with the protruding semi-ring that is used for rotating with the annular and is connected to rotate a seat one, two protruding semi-ring combination forms the annular.

Through the technical scheme, the first rotating seat is rotationally connected with the screw rod through the male semi-ring, and can limit the screw rod to move along the axial direction of the screw rod. When the bolts for fixing the rotating seat I and the fixed seat are removed, the fixed seat I can be conveniently disassembled and assembled with the screw rod.

Preferably, a convex ring is fixed on the outer wall of the screw rod along the circumferential direction, two rotating seats II are fixed on the fixed seat through bolts, the two rotating seats II are symmetrical about the radial direction of the screw rod, the rotating seats II are provided with grooves which are used for being in rotating connection with the convex ring, and the two grooves are combined to form an annular groove; the second rotating seat is completely positioned in the sliding groove, and the sliding block is positioned between the first rotating seat and the second rotating seat.

Through the technical scheme, the first rotating seat and the second rotating seat are located at different positions in the length direction of the screw rod, and the first rotating seat and the second rotating seat are matched to enable the screw rod to be rotatably connected with the fixing seat, so that the connection strength of the screw rod and the fixing seat is improved, and the screw rod is prevented from being separated from the fixing seat when stressed.

Preferably, the screw rod comprises an orthodontic screw thread section and a contra-dental screw thread section which are coaxially fixed, the eccentric shaft is in threaded connection with the orthodontic screw thread section, the fixed seat is provided with a balancing weight in a sliding manner, the sliding direction of the balancing weight is along the axial direction of the screw rod, the contra-dental screw thread section penetrates through the balancing weight and is in threaded connection with the balancing weight, and the eccentric shaft and the balancing weight are respectively positioned on two radial sides of the axis of the rotating shaft.

Through the technical scheme, after the eccentric shaft slides along the sliding groove, the counterweight block can slide in a self-adaptive mode, the counterweight block is used for balancing the change of the integral gravity center of the fixing seat, and the vibration of the whole fixing seat during rotation is reduced.

Preferably, the screwing head is provided with a screwing groove for the head of the screwdriver to be embedded in, and the fixing seat is provided with a locking structure which can be movably embedded in the screwing groove so as to limit the rotation of the screwing head.

Through the technical scheme, when a person does not rotate the screw rod, the locking structure is embedded into the screwing groove to limit the screwing head and the screw rod to rotate spontaneously; when the screw rod needs to be rotated by a person, the locking structure is driven to move to unlock the screwing head.

Preferably, the screwing groove radially penetrates through the outer side wall of the screwing head along the screwing head, the locking structure comprises a spring arranged in the fixing seat and a locking block abutted against the end part of the spring, and the elastic force of the spring drives the locking block to be embedded into the screwing groove.

Through the technical scheme, when the fixing seat rotates to the state that the screw head is just opposite to the through hole, a person inserts the head of the screwdriver into the screwing groove, the movable screwdriver pushes the locking block away from the screwing groove, the locking of the locking block on the screw head is released, and then the person drives the screw rod to rotate in a mode of rotating the screwdriver. After the screw rod is screwed for a certain number of turns, the end part of the screwing groove is opposite to the locking block, and after a person takes out the screwdriver, the locking block automatically extends into the screwing groove under the elastic action of the spring to limit the screwing head to generate spontaneous rotation.

Preferably, the outer wall of the fixing seat is circumferentially provided with a plurality of shifting grooves, and the shifting grooves are used for being embedded by the head of a screwdriver.

According to the technical scheme, when a person needs to rotate the fixed seat, the head of the screwdriver is inserted into the shifting groove, and the fixed seat is driven to rotate in a shifting groove shifting mode; the shifting groove increases the stress position of the screwdriver head.

Preferably, the shell is provided with a plurality of observation holes near the perforated holes, the observation holes penetrate through the shell, and the observation holes are distributed along the height direction of the shell.

Through above-mentioned technical scheme, the observation hole is convenient for personnel to observe the screwdriver head and the position of twisting the head, makes things convenient for personnel to operate the screwdriver.

In summary, compared with the prior art, the beneficial effects of the invention are as follows:

1. the air compressor can conveniently adjust the stroke of the piston to adapt to the air using speed of the air tank, the air compressor does not need to be started or stopped frequently during working, and the air compressor is not easy to damage;

2. when the personnel adjust the piston stroke, the air compressor does not need to be disassembled and assembled, and the stability of the eccentric shaft after the adjustment is finished is high;

3. the eccentric shaft, the fixed seat and the adjusting mechanism can be conveniently disassembled and assembled.

Drawings

Fig. 1 is a half sectional view of a variable stroke air compressor of an embodiment;

FIG. 2 is a perspective view of the fixing base of the embodiment;

FIG. 3 is an exploded view of the holder of the embodiment;

fig. 4 is a partial view of the embodiment, mainly highlighting the structure of the screw head, the escape slot, the locking block.

In the figure, 10, the housing; 1. a cylinder; 12. a piston; 13. a motor; 14. a rotating shaft; 15. a connecting rod; 2. a fixed seat; 3. an eccentric shaft; 21. a chute; 31. a slider; 4. a balancing weight; 5. a screw rod; 51. an orthodontic threaded segment; 52. a thread section of a reverse thread; 53. a ring groove; 54. a convex ring; 22. rotating the first base; 221. a male half ring; 23. a second rotating seat; 231. a groove; 55. screwing the head; 551. screwing the groove; 6. a locking structure; 61. a spring; 62. a locking block; 222. an avoidance groove; 24. a groove is poked; 101. perforating; 102. and (6) observing holes.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the variable stroke air compressor disclosed by the invention comprises a housing 10, a cylinder 1, a piston 12, a motor 13, and a rotating shaft 14 driven by the motor 13 to rotate, wherein the bottom of the piston 12 is hinged with a connecting rod 15. The rotating shaft 14 extends out of the motor 13 from two ends of the motor 13 respectively, two sets of the air cylinder 1 and the piston 12 are symmetrically arranged, and a one-way valve plate is arranged in the air cylinder 1 to realize one-way air inlet and one-way air outlet (not shown in the figure) of the air cylinder 1. A fixed seat 2 and an eccentric shaft 3 are arranged between the rotating shaft 14 and the connecting rod 15, the end part of the connecting rod 15 departing from the piston 12 is sleeved outside the eccentric shaft 3, and the connecting rod 15 is rotatably connected with the eccentric shaft 3 through a bearing. When the motor 13 drives the rotating shaft 14 to rotate, the rotating shaft 14 drives the fixed seat 2 and the eccentric shaft 3 to rotate, and the eccentric shaft 3 drives the piston 12 to reciprocate in the cylinder 1 through the connecting rod 15.

Referring to fig. 2 and 3, the fixing base 2 is cylindrical, an axis of the fixing base 2 coincides with the rotating shaft 14, and the fixing base 2 is fixed to the rotating shaft 14 through an end face center. The terminal surface that fixing base 2 deviates from pivot 14 is equipped with spout 21, and the length direction of spout 21 is along fixing base 2 radially, and the both ends of spout 21 link up with fixing base 2's circumference outer wall. The sliding groove 21 penetrates through the fixed seat 2 in the direction away from the rotating shaft 14 to form a notch, and the notch of the sliding groove 21 is in a necking shape to form a dovetail groove.

The eccentric shaft 3 comprises a sliding block 31 integrally fixed at the end, the sliding block 31 is shaped corresponding to the sliding groove 21 and is arranged in the sliding groove 21 in a sliding manner, the sliding block 31 cannot be separated from the sliding groove 21 from the notch of the sliding groove 21, and the axis of the eccentric shaft 3 is parallel to the rotating shaft 14 but is deviated from the rotating shaft 14. The chute 21 is also provided with a counterweight 4 in a sliding way, and the eccentric shaft 3 and the counterweight 4 are respectively positioned at two radial sides of the axis of the rotating shaft 14. The screw rod 5 is arranged in the sliding groove 21 in a rotating mode, the length direction of the screw rod 5 is along the length direction of the sliding groove 21, the screw rod 5 comprises a positive thread section 51 and a negative thread section 52 which are coaxially fixed, the positive thread section 51 penetrates through the sliding block 31 and is in threaded connection with the sliding block 31, and the negative thread section 52 penetrates through the balancing weight 4 and is in threaded connection with the balancing weight 4. When the screw rod 5 rotates, the screw thread directions of the positive thread section 51 and the negative thread section 52 are opposite, so that the screw rod 5 drives the eccentric shaft 3 and the balancing weight 4 to synchronously approach or synchronously separate. The weight of balancing weight 4 is calculated and is customized through the experiment in advance, and after eccentric shaft 3 slided along spout 21, balancing weight 4 was used for the holistic focus of balanced fixing base 2 to change, reduces the vibration when 2 wholly rotate of fixing base.

The rotary connecting structure of the screw rod 5 and the fixed seat 2 is as follows: the outer wall of the screw rod 5 is provided with a ring groove 53 and a convex ring 54 along the circumferential direction, and the ring groove 53 and the convex ring 54 are respectively positioned at two sides of the slide block 31 facing away from the slide block. Two rotating seats I22 are fixed on the fixed seat 2 through bolts, and the two rotating seats I22 are symmetrical in the radial direction of the screw rod 5; the first rotating seats 22 are specifically fixed on the circumferential outer wall of the fixed seat 2 through bolts, and the end parts of the sliding grooves 21 are shielded by the first rotating seats 22. The first rotating seat 22 is provided with a convex half ring 221 which is used for being rotationally connected with the annular groove 53, the two convex half rings 221 are combined to form a ring shape, and the first rotating seat 22 is rotationally connected with the screw rod 5 through the convex half ring 221 and can limit the axial movement of the screw rod 5. When the sliding block 31 slides in the sliding groove 21, the first rotating seat 22 can limit the movement of the sliding block 31 and prevent the sliding block 31 from separating from the sliding groove 21; when the bolts for fixing the first rotating seat 22 and the fixed seat 2 are removed, the first rotating seat 22 can be conveniently disassembled and assembled with the screw rod 5.

The convex ring 54 is positioned between the orthodontic thread section 51 and the anti-orthodontic thread section 52, two rotating seats II 23 are fixed on the fixed seat 2 through bolts, and the two rotating seats II 23 are also symmetrical about the radial direction of the screw rod 5. The second rotating seat 23 is fixed in the sliding groove 21 through a bolt, and the second rotating seat 23 and the bolt thereof are completely positioned in the sliding groove 21; the second rotating seat 23 is located in the middle of the fixed seat 2 and between the sliding block 31 and the counterweight block 4. The second rotating seat 23 is provided with a groove 231 for rotationally connecting with the convex ring 54, the groove 231 is semi-annular, the two grooves 231 are combined to form an annular groove, and the second rotating seat 23 is rotationally connected with the screw rod 5 through the groove 231 and can limit the screw rod 5 to move along the axial direction of the screw rod. When the sliding block 31 slides in the sliding groove 21, the second rotating seat 23 can limit the movement of the sliding block 31, and the sliding block 31 is prevented from moving to the center of the fixed seat 2. After the bolts for fixing the second rotating seat 23 and the fixed seat 2 are removed, the second rotating seat 23 can move away from the sliding groove 21 along with the screw rod 5, and the second rotating seat 23 is convenient to disassemble and assemble.

The first rotating seat 22 and the second rotating seat 23 are matched to establish the rotating connection between the screw rod 5 and the fixed seat 2, so that the connection strength between the screw rod 5 and the fixed seat 2 is improved, and the screw rod 5 is prevented from being separated from the fixed seat 2 when stressed.

Referring to fig. 3 and 4, a screw head 55 for rotating the screwdriver is fixedly arranged at the end of the screw rod 5 away from the fixed seat 2, and the screw head 55 is specifically positioned at the first rotating seat 22. The screw head 55 is provided with a screw groove 551 for the head of the screwdriver to be embedded in, the screw groove 551 is cross-shaped, and the screw groove 551 radially penetrates to the outer side wall of the screw head 55 along the screw head 55. The fixing seat 2 is provided with a locking structure 6, and the locking structure 6 can be movably embedded into the screwing groove 551 so as to limit the rotation of the screwing head 55. The locking structure 6 comprises a spring 61 arranged in the fixed seat 2 and a locking block 62 abutting against the end of the spring 61, the spring 61 is located on the radial side of the screwing head 55, two ends of the spring 61 are respectively fixed with the fixed seat 2 and the locking block 62, and the elastic force of the spring 61 drives the locking block 62 to be embedded into the screwing groove 551. The rotating seat I22 is also provided with an avoiding groove 222 connected with the end part of the screwing groove 551, the avoiding groove 222 penetrates through the rotating seat I22 along the length direction of the screwing groove 551, and the head part of the screwdriver and the locking block 62 can enter the avoiding groove 222.

Referring to fig. 1 and 2, a plurality of shifting grooves 24 are formed in the outer wall of the fixing seat 2 along the circumferential direction, the shifting grooves 24 penetrate through the fixing seat 2 along the thickness direction of the fixing seat 2, and the shifting grooves 24 are used for enabling the head of a screwdriver to be embedded. The casing 10 is provided with a through hole 101 through which a screwdriver is inserted, and the through hole 101 is located at the same height as the rotary shaft 14. The fixed seat 2 can make the through hole 101 opposite to the screw head 55 through rotation. A plurality of observation holes 102 are formed in the position, close to the through hole 101, of the shell 10, the observation holes 102 are long-strip-shaped, the observation holes 102 penetrate through the shell 10, and the observation holes 102 are distributed along the height direction of the shell 10.

The method for adjusting the stroke of the air compressor comprises the following steps: during adjustment, a pipeline of an exhaust port of the air compressor needs to be disconnected, so that a compression cavity in the air cylinder 1 is communicated with the outside air. The adjusting tool is a screwdriver, and the screwdriver is preferably a straight screwdriver.

A person inserts the head of the screwdriver into the through hole 101, observes the position of the head of the screwdriver through the observation hole 102, and drives the driving groove 24 to rotate the fixing base 2. The fixed seat 2 only receives the friction resistance of the related parts when rotating, the piston 12 does not receive the resistance of the compressed air, and therefore the screwdriver can drive the fixed seat 2 to rotate.

When the fixed seat 2 is rotated until the screw head 55 is opposite to the through hole 101, a person inserts the head of the screwdriver into the screw groove 551, and simultaneously the movable screwdriver pushes the locking block 62 away from the screw groove 551, so that the locking of the locking block 62 on the screw head 55 is released. Then, a person drives the screw rod 5 to rotate by rotating the screwdriver, the screw rod 5 drives the sliding block 31 and the eccentric shaft 3 to move along the sliding groove 21, and the piston 12 is lifted in the cylinder 1 in a self-adaptive mode in the moving process of the eccentric shaft 3.

After the screw rod 5 is screwed for a certain number of turns, the end part of the screwing groove 551 is opposite to the locking block 62, at the moment, a person takes out the screwdriver, and the locking block 62 extends into the screwing groove 551 under the action of the elastic force of the spring 61 to limit the screwing head 55 to rotate spontaneously.

Because the distance of the eccentric shaft 3 from the axis of the rotating shaft 14 is changed, the stroke of the piston 12 is changed when the eccentric shaft 3 rotates, and the air compression amount of the piston 12 is changed with each rotation of the rotating shaft 14. Personnel can adjust the stroke of piston 12 through this mode, makes the speed of calming anger of air compressor machine and the gas rate of gas pitcher keep level basically, then the air compressor machine during operation need not frequently to open and stop, and the air compressor machine is not fragile. When the personnel adjust the stroke of the piston 12, the air compressor does not need to be disassembled and assembled, and the screw rod 5 can not rotate spontaneously after the adjustment is completed.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. The air compressor with the variable stroke comprises a shell (10), a cylinder (1), a piston (12), a motor (13) and a rotating shaft (14) driven by the motor (13) to rotate, wherein an eccentric shaft (3) is arranged on the rotating shaft (14) in a deviation mode, the piston (12) and the eccentric shaft (3) are connected through a connecting rod (15) arranged between the piston (12) and the eccentric shaft (3), and two ends of the connecting rod (15) are respectively in rotating connection with the eccentric shaft (3) and the piston (12); the method is characterized in that:

a fixed seat (2) is fixed at the end part of the rotating shaft (14), the eccentric shaft (3) is arranged on the fixed seat (2) in a sliding manner, the sliding direction of the eccentric shaft (3) is radial along the rotating shaft (14), a screw rod (5) is arranged in the fixed seat (2) in a rotating manner, the axial direction of the screw rod (5) is along the sliding direction of the eccentric shaft (3), the screw rod (5) penetrates through the eccentric shaft (3) and is in threaded connection with the eccentric shaft (3), a twisting head (55) for a screwdriver to rotate is fixedly arranged at the end part of the screw rod (5) departing from the fixed seat (2), a through hole (101) for the screwdriver to penetrate through is formed in the shell (10), and the fixed seat (2) can rotate to enable the through hole (101) to be opposite to the twisting head (55);

the eccentric shaft connecting structure is characterized in that a sliding groove (21) for the eccentric shaft (3) to be in sliding connection is formed in the fixed seat (2), the sliding groove (21) penetrates through the fixed seat (2) in the direction away from the rotating shaft (14) to form a notch, the notch of the sliding groove (21) is in a necking shape, the eccentric shaft (3) comprises a sliding block (31) which is integrally fixed, the eccentric shaft (3) is in threaded connection with the screw rod (5) through the sliding block (31), the sliding block (31) is in sliding connection with the sliding groove (21), and the sliding block (31) cannot be separated from the sliding groove (21) from the notch of the sliding groove (21).

2. The variable stroke air compressor as claimed in claim 1, wherein: the one end of spout (21) runs through the circumference outer wall of fixing base (2), annular (53) have been seted up along circumference to the outer wall of lead screw (5), there are two through the bolt fastening on fixing base (2) and rotate seat (22), two rotate the radial symmetry about lead screw (5) of seat (22), it is equipped with protruding semi-ring (221) that are used for rotating with annular (53) and is connected to rotate seat (22), two protruding semi-ring (221) combination forms annularity.

3. The variable stroke air compressor as claimed in claim 2, wherein: a convex ring (54) is fixed on the outer wall of the screw rod (5) along the circumferential direction, two rotating seats II (23) are fixed on the fixed seat (2) through bolts, the two rotating seats II (23) are radially symmetrical relative to the screw rod (5), a groove (231) which is used for being rotationally connected with the convex ring (54) is formed in each rotating seat II (23), and the two grooves (231) are combined to form an annular groove; the second rotating seat (23) is completely positioned in the sliding groove (21), and the sliding block (31) is positioned between the first rotating seat (22) and the second rotating seat (23).

4. The variable stroke air compressor as claimed in claim 1, wherein: the lead screw (5) comprises an orthodontic thread section (51) and a counter thread section (52) which are coaxially fixed, the eccentric shaft (3) is in threaded connection with the orthodontic thread section (51), the fixed seat (2) is provided with a balancing weight (4) in a sliding mode, the sliding direction of the balancing weight (4) is along the axial direction of the lead screw (5), the counter thread section (52) penetrates through the balancing weight (4) and is in threaded connection with the balancing weight (4), and the eccentric shaft (3) and the balancing weight (4) are respectively located on two radial sides of the axis of the rotating shaft (14).

5. The variable stroke air compressor as claimed in claim 1, wherein: the screwdriver head (55) is provided with a screwing groove (551) for the head of a screwdriver to be embedded, the fixed seat (2) is provided with a locking structure (6), and the locking structure (6) can be movably embedded into the screwing groove (551) so as to limit the rotation of the screwing head (55).

6. The variable stroke air compressor as claimed in claim 5, wherein: the screwing groove (551) radially penetrates through the outer side wall of the screwing head (55) along the screwing head (55), the locking structure (6) comprises a spring (61) arranged in the fixed seat (2) and a locking block (62) abutted against the end part of the spring (61), and the locking block (62) is driven to be embedded into the screwing groove (551) by the elastic force of the spring (61).

7. The variable stroke air compressor as claimed in claim 1, wherein: the outer wall of fixing base (2) is equipped with a plurality of grooves (24) of dialling along circumference, it is used for supplying screwdriver's head embedding to dial groove (24).

8. The variable stroke air compressor as claimed in claim 7, wherein: the shell (10) is provided with a plurality of observation holes (102) near the through hole (101), the observation holes (102) penetrate through the shell (10), and the observation holes (102) are distributed along the height direction of the shell (10).