CN210799260U - Hand-held electric air pump - Google Patents

Abstract

A hand-held electric air pump comprises an air pump body, a transmission module, a power supply, a cylinder body and a piston. The air pump body comprises a shell and a copper head, the transmission module comprises a motor, a driving gear and a reduction gear, the motor is accommodated in the shell, the driving gear is arranged on an output shaft of the motor, the reduction gear is meshed with the driving gear, and an eccentric table is arranged on the reduction gear; the power supply is arranged on the shell, the cylinder body is provided with a transition cavity and an air cavity, the piston comprises a connecting rod, an externally tangent ring and a piston ring, the connecting rod and the externally tangent ring are of an integrally formed structure, the externally tangent ring is covered on the eccentric table, the piston ring is sleeved on the connecting rod, and the piston ring is located in the air cavity. The transmission module is used for driving the piston to move in the cylinder body to inflate external parts, and the structure of the piston is adjusted, so that the swing amplitude in the movement process of the piston is reduced, the abrasion loss of the piston and the inner wall of the cylinder body is reduced, and the service life of the air pump is prolonged.

Description

Hand-held electric air pump

Technical Field

The utility model relates to an air pump especially relates to an electronic air pump of hand-held type.

Background

The hand-held electric air pump is driven by a motor and is used for completing some inflation work, such as inflating balloons, basketballs, swim rings, automobile tires and the like, and is also suitable for occasions needing inflation in the machining or mechanical assembly process. Compared with the prior hand tool, the handheld electric air pump greatly facilitates the daily inflation and processing operation of workers or users.

When the hand-held air pump operates, the axis of the piston is not parallel to the central line of the pump body all the time in the reciprocating motion process of the piston, and the piston and the pump body are easily worn excessively when the amplitude of oscillation of the piston connecting rod is too large, so that the service life of the air pump is relatively short.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the weak point among the prior art, providing a can reduce the pump body of air pump and the electronic air pump of hand-held type of piston wearing and tearing volume, optimize the structure of piston, the amplitude of fluctuation when reducing the piston motion, and then improve the life of air pump.

The purpose of the utility model is realized through the following technical scheme:

a hand-held electric air pump comprising: the air pump comprises an air pump body, a transmission module, a power supply, a cylinder body and a piston;

the air pump body comprises a shell and a copper head, the shell is provided with an air outlet, the copper head is arranged on the inner side wall of the shell, and the copper head is communicated with the air outlet;

the transmission module comprises a motor, a driving gear and a reduction gear, the motor is accommodated in the shell, the driving gear is mounted on an output shaft of the motor, the reduction gear is meshed with the driving gear, and an eccentric table is arranged on the reduction gear;

the power supply is arranged at one end of the shell far away from the air outlet and is electrically connected with the motor;

the cylinder body is provided with a transition cavity and an air cavity, the air cavity is communicated with the transition cavity, the copper head is connected with the outer wall of the cylinder body, and the copper head is communicated with the transition cavity;

the piston includes connecting rod, circumscribed ring and piston ring, the connecting rod reaches circumscribed ring is integrated into one piece structure, the circumscribed ring cover is located on the eccentric platform, just the outer wall of eccentric platform with the inner wall of circumscribed ring is tangent, the piston ring cover is arranged in the connecting rod is kept away from one of circumscribed ring is served, the piston ring is located in the gas chamber, just the outer wall of piston ring with the inner wall of gas chamber is hugged closely, and the motor is rotatory to be used for the drive the piston ring is followed the reciprocating motion of gas chamber inner wall.

In one embodiment, the eccentric table is of a cylindrical structure.

In one embodiment, the inner diameter of the circumscribing ring is greater than the diameter of the eccentric table.

In one embodiment, the piston ring comprises a fastening block and a deformation block, the fastening block is sleeved on the connecting rod, and the deformation block is arranged on the outer wall of the fastening block and is tightly attached to the inner wall of the air cavity.

In one embodiment, the fastening block and the deformation block are integrally formed.

In one embodiment, the deformation block is in a circular ring shape, and the outer diameter of the deformation block decreases progressively from one end close to the transition cavity to one end far away from the transition cavity.

In one embodiment, the device further comprises a one-way valve embedded in the transition cavity.

In one embodiment, the housing is provided with a holding portion and a working portion, the motor is located in the holding portion, and the piston and the cylinder are located in the working portion.

In one embodiment, the axis of the holding part and the axis of the working part are perpendicular to each other.

In one embodiment, the driving gear and the reduction gear are both spur gears.

Above-mentioned electronic air pump of hand-held type is through setting up air pump body, transmission module, power, cylinder body and piston, and the transmission module is used for driving the piston and carries out the piston motion in order to aerify the external part in the cylinder body to adjust the structure of piston, reduce the swing amplitude of piston motion in-process, thereby reduce the wearing and tearing volume of piston and cylinder body inner wall, and then improve the life of air pump.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a handheld electric air pump according to an embodiment of the present invention;

FIG. 2 is an exploded view of the internal pump body of the hand-held electric air pump of FIG. 1;

fig. 3 is a schematic view illustrating an operating state of the piston in the cylinder when the eccentric table is located at the near point position according to an embodiment of the present invention;

FIG. 4 is a schematic view of the piston of FIG. 3 in an intermediate position during a piston movement within the cylinder;

FIG. 5 is a schematic view of the piston operating in the cylinder with the eccentric table of FIG. 3 at a far point;

fig. 6 is an exploded view of a power supply in an embodiment of the invention;

FIG. 7 is a partial structural view of the grip portion of the housing;

FIG. 8 is an enlarged partial schematic view of FIG. 5 at A;

fig. 9 is a schematic distribution diagram of four quadrant points in the motion track of the eccentric table.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, a hand-held electric air pump 10 includes: the air pump comprises an air pump body 100, a transmission module 200, a power supply 300, a cylinder body 400 and a piston 500, wherein the power supply 300 is used for supplying electric energy to the transmission module 200 so as to enable the transmission module 200 to drive the piston 500 to perform piston motion in the cylinder body 400, and a buffer structure is arranged on the piston 500, so that the swing amplitude of the piston 500 during motion is reduced, and the abrasion loss between the piston 500 and the cylinder body 400 during the motion of the piston is reduced.

Referring to fig. 1 and 2, the air pump body 100 includes a housing 110 and a copper head 120, the housing 110 has an air outlet, the copper head 120 is disposed on an inner sidewall of the housing 110, and the copper head 120 is communicated with the air outlet; the transmission module 200 includes a motor 210, a driving gear 220 and a reduction gear 230, and specifically, the driving gear 220 and the reduction gear 230 are spur gears. The motor 210 is accommodated in the housing 110, the driving gear 220 is mounted on an output shaft of the motor 210, the reduction gear 230 is engaged with the driving gear 220, and the reduction gear 230 is provided with an eccentric table 231; the power source 300 is disposed on an end of the housing 110 away from the air outlet, and the power source 300 is electrically connected to the motor 210. Wherein the center line of the eccentric table 231 is parallel to the central axis of the reduction gear 230, and the distance from the center line of the eccentric table 231 to the central axis of the reduction gear 230 is the radius of gyration of the eccentric table 231.

When the motor 210 is started, the driving gear 220 is driven to rotate, when the driving gear 220 rotates, the reduction gear 230 rotates, and the eccentric table 231 on the reduction gear 230 starts to rotate around the axial lead of the reduction gear 230, and in the rotating process, the piston 500 is stirred to perform piston motion in the cylinder 400. The copper head 120 is located at the air outlet of the housing 110, and is used for being connected with an external inflation tube, and compressed air generated by the handheld electric air pump 10 is introduced into a product to be inflated through the inflation tube.

Referring to fig. 3, the cylinder body 400 is provided with a transition cavity 410 and an air cavity 420, the air cavity 420 is communicated with the transition cavity 410, the copper head 120 is connected with the outer wall of the cylinder body 400, and the copper head 120 is communicated with the transition cavity 410; that is, two cavities are arranged in the cylinder 400, the piston 500 is located in the air cavity 420, and the piston moves in the air cavity 420, so that air is compressed and squeezed into the transition cavity 410, that is, the air cavity 420 compresses the air, the compressed air is input into the transition cavity 410 for pressure stabilization, and when the handheld electric air pump 10 is communicated with a product to be inflated, the compressed air in the transition cavity 410 is the same as the inside of the product.

Referring to fig. 2 and 3, the piston 500 includes a connecting rod 510, an outer ring 520 and a piston ring 530, the connecting rod 510 and the outer ring 520 are integrally formed, the outer ring 520 is covered on the eccentric table 231, the outer wall of the eccentric table 231 is tangent to the inner wall of the outer ring 520, the piston ring 530 is sleeved on one end of the connecting rod 510 away from the outer ring 520, the piston ring 530 is located in the air cavity 420, the outer wall of the piston ring 530 is tightly attached to the inner wall of the air cavity 420, and the motor 210 rotates to drive the piston ring 530 to reciprocate along the inner wall of the air cavity 420.

The circumscribed ring 520 is in a circular ring structure, the circumscribed ring 520 is shifted to displace along with the circumscribed ring in the rotation process of the eccentric table 231, the piston ring 530 is always positioned in the air cavity 420, the inner wall of the air cavity 420 limits the movable range of the piston ring 530, so that the piston ring can only linearly displace along the inner wall of the air cavity 420, namely, the piston moves, and the movement sequence can refer to fig. 3 to 5.

Referring to fig. 9, specifically, the rotation track of the eccentric table 231 is circular, and includes four points of view, namely, a far point 231a farthest from the cylinder 400, a near point 231b closest to the cylinder 400, and two deviated peak points 231c, when the eccentric table 231 rotates to the far point 231a, the piston ring 530 is farthest from the transition cavity 410, when the eccentric table 231 rotates to the near point 231b, the piston ring 530 is closest to the transition cavity 410, and the central axis of the connecting rod 510 coincides with the central axis of the air cavity 420 under the above two conditions; when the eccentric table 231 revolves to the deviated peak point 231c, the piston ring 530 is located at the center position of the piston movement distance, and the offset between the central axis of the connecting rod 510 and the central axis of the air cavity 420 is the largest at this time, i.e. the swing amplitude of the piston 500 is the largest, the utility model discloses not mutually hinged between the circumscribed ring 520 and the eccentric table 231, but the eccentric table 231 is inscribed in the circumscribed ring 520, i.e. the eccentric table 231 can move in the circumscribed ring 520, thereby reducing the swing amplitude of the piston 500 when the eccentric table 231 revolves to the deviated peak point 231 c. Specifically, the eccentric table 231 has a cylindrical structure, and the inner diameter of the circumscribed ring 520 is larger than the diameter of the eccentric table 231. The amplitude of the swing of the piston 500 when the eccentric table 231 is rotated is reduced.

Referring to fig. 7 and 8, in order to prolong the service life of the piston ring 530 and improve the efficiency of compressing gas by the piston movement, the piston ring 530 includes a fastening block 531 and a deformation block 532, the fastening block 531 is sleeved on the connecting rod 510, the deformation block 532 is disposed on the outer wall of the fastening block 531 and is tightly attached to the inner wall of the air cavity 420, and the fastening block 531 and the deformation block 532 are integrally formed. The shape-changing block 532 is circular, and the outer diameter of the shape-changing block 532 decreases from the end close to the transition cavity 410 to the end far away from the transition cavity 410.

Referring to fig. 7 and 8, the fastening block 531 is used for connecting the connecting rod 510, the deformation block 532 is tightly attached to the inner wall of the air cavity 420 to improve the sealing degree between the piston ring 530 and the inner wall of the air cavity 420, the air cavity 420 is divided into a compression section 421 and a buffer section 422 by the piston ring 530, wherein the compression section 421 is communicated with the transition cavity 410, when the piston ring 530 moves towards the direction close to the transition cavity 410, the volume of the compression section 421 decreases, and the air in the compression section 421 is compressed, the pressure intensity increases, and the air is squeezed into the transition cavity 410; when the piston ring 530 moves away from the transition chamber 410, the volume of the compression section 421 increases, the air pressure in the compression section 421 decreases, the air pressure in the buffer section 422 is greater than the air pressure in the compression section 421, and the air in the buffer section 422 enters the compression section 421 and is compressed in the next piston movement to enter the transition chamber 410.

Referring to fig. 3, 4 and 5, it should be noted that when the piston ring 530 moves toward the transition cavity 410, the air pressure in the compression section 421 is greater than the air pressure in the buffer section 422, that is, the direction of the air pressure acting on the piston ring 530 is from the position close to the transition cavity 410 to the position far from the transition cavity 410, and because the outer diameter of the deformation block 532 decreases from the end close to the transition cavity 410 to the end far from the transition cavity 410, the resultant force of the air pressures acts on the end surface of the deformation block 532 close to the transition cavity 410 to cause the deformation block 532 to open, so that the deformation block 532 is attached to the inner wall of the air cavity 420 more tightly, and the sealing degree between the piston ring 530 and the air cavity 420 is maintained by the compressed air; as the piston ring 530 moves away from the transition chamber 410, the gas pressure in the compression section 421 is less than the gas pressure in the cushioning section 422, namely, the direction of the pneumatic pressing force acting on the piston ring 530 is from the position far away from the transition cavity 410 to the position near the transition cavity 410, and since the outer diameter of the deformation block 532 decreases from the end near the transition cavity 410 to the end far away from the transition cavity 410, namely, the deformation block is in a circular truncated cone shape, the resultant force of the air pressure acts on the end surface of the deformation block 532 far away from the transition cavity 410, namely, on the conical surface of the circular truncated cone, the air pressure resultant force can slightly deform the deformation block 532, so that a gap is formed between the outer wall of the deformation block 532 and the inner wall of the air cavity 420, air enters the compression section 421 through the gap, this eliminates the need for a special air inlet and check valve on the cylinder 400 to provide an air inlet path, so as to make the structure of the hand-held electric air pump 10 more compact.

To prevent the piston ring 530 from displacing away from the transition chamber 410 and thereby pumping out the compressed air from the transition chamber 410, the hand-held electric air pump 10 further includes a check valve embedded in the transition chamber 410. And a check valve is located between the transition chamber 410 and the air chamber 420 for preventing the compressed air in the transition chamber 410 from flowing backward into the air chamber 420.

Referring to fig. 1, in order to facilitate the user to hold the hand-held electric air pump, the housing 110 is provided with a holding portion 112 and a working portion 113, the motor 210 is located in the holding portion 112, the piston 500 and the cylinder 400 are both located in the working portion 113, and the axis of the holding portion 112 and the axis of the working portion 113 are perpendicular to each other, i.e., the holding portion 112 and the working portion 113 form a gun-shaped structure, so as to improve the comfort level of the user holding the hand-held electric air pump 10.

Referring to fig. 1, the requirements of different products on the air pressure during the inflation process are different, for example, the air pressure in the tire of an automobile is much greater than the air pressure inside the balloon, that is, when different products are inflated, the handheld electric air pump 10 needs to provide compressed air with different pressures, that is, the handheld electric air pump 10 needs to have the capability of regulating and controlling the air pressure, in order to meet the inflation requirements of different products, the handheld electric air pump 10 further includes an air pressure regulating and controlling assembly 700, the air pressure regulating and controlling assembly 700 includes a PCB control board 710, a display 720, a control panel 730, a conducting pipe 740 and an air pressure sensor 750, the control panel 730 is covered on the housing 110, the display 720 is embedded on the control panel 730, the air pressure sensor 750 is disposed in the housing 110, the conducting pipe 740 is disposed between the air pressure sensor 750 and the cylinder 400, the air pressure sensor 750 is respectively communicated with the transition cavity 410 and the air pressure sensor 750, that is, the air pressure sensor 750 is used for monitoring the air pressure in the transition cavity 410, the air pressure sensor 750, the display 720 and the control panel 730 are electrically connected with the PCB control board 710, and the PCB control board 710 is electrically connected with the motor 210. The transition cavity 410 is communicated with the air pressure sensor 750 through the conducting tube 740, wherein the air pressure inside the transition cavity 410 is the output air pressure of the handheld electric air pump, the air pressure sensor 750 is communicated with the transition cavity 410 to directly measure the air pressure inside the transition cavity 410, and the detected data is converted into electric signals to be fed back to the PCB control board 710 and finally displayed in the display 720. When different products are inflated, the air pressure value is set through the control panel 730, the control panel 730 transmits the equipment setting value to the PCB control panel 710, and then the rotating speed of the motor 210 is controlled, so that the air pressure in the transition cavity 410 is controlled, and the purpose of controlling the handheld electric air pump is achieved.

Referring to fig. 1, the PCB control board 710 and the air pressure sensor 750 are vulnerable components, which need to be protected, the air pressure regulation and control assembly further includes a protective cover 760, a snap ring is disposed on an outer wall of the protective cover 760, a mounting hole is disposed on the housing 110, a limiting cavity is disposed on a hole wall of the mounting hole, the protective cover 760 penetrates the mounting hole, the snap ring is embedded in the limiting cavity, the air pressure sensor 750 and the PCB control panel 730 are accommodated in the protective cover 760, the control panel 730 is covered on the protective cover 760, the control panel 730 and the protective cover 760 enclose the protecting cavity, the PCB control board 710 and the air pressure sensor 750 are both located in the protecting cavity, that is, an independent cavity is disposed inside the handheld electric air pump 10 and is specially used for accommodating the vulnerable components such as the PCB control board 710 and the air pressure sensor 750, which can effectively prevent the vulnerable components from colliding with the vulnerable components when the piston 500 operates, and the distribution of the internal parts of the housing 110 is more orderly, facilitating maintenance operations.

Specifically, the control panel 730 is provided with a plurality of buttons, a user inputs inflation parameters such as output air pressure and inflation speed of the handheld electric air pump through button operation, the handheld electric air pump 10 is connected with a product to start inflation, the air pressure sensor 750 feeds the air pressure in the transition cavity 410 back to the PCB control panel 710, the PCB control panel 710 converts the air pressure and displays the converted air pressure on the display 720 in a digital form, wherein the process of converting the air pressure analog quantity into the electric signal by the air pressure sensor 750 is mainly performed by a controller of the air pressure sensor 750, the air pressure sensor can be a digital pressure gauge on the market or an air pressure probe without a display function, the air pressure electric signal is transmitted to the PCB control panel 710, a corresponding control program is arranged in the PCB control panel 710, the air pressure electric signal is converted into the display electric signal and transmitted to the display 720, the control panel 730 is mainly used for the user to set the inflation parameters, and the control process is well known in the art and will not be described herein again.

Compared with the traditional air pump, the handheld electric air pump has the characteristics of small volume and convenient carrying, and means that the handheld electric air pump is not limited by places and cables when being used for inflation operation, and can be used for inflation operation anywhere and anytime, but due to the portable characteristic, the handheld electric air pump depends on a power supply arranged in the air pump to provide inflation energy when being used, namely the capacity of the power supply determines the duration of the working time of the handheld electric air pump, at present, the power supply of the handheld electric air pump on the market is integrated with an air pump body, the power supply is arranged in the air pump, when the electric quantity of the air pump is exhausted, the air pump needs to be charged, the air pump cannot work at the moment, the charging operation can be carried out again after the charging is finished, and because the power supply and the air pump are integrated, the charging process has certain inconvenience, and the air pump has certain quality, when the socket at home is set higher, the air pump needs to be supported, otherwise the charging connector cannot bear the weight of the air pump alone and cannot be kept in butt joint with the socket, and if the vehicle is charged, the air pump has a certain volume and occupies more space, and particularly when a passenger is in the vehicle, the comfort level of the passenger is reduced, in order to solve the above problems, the power supply 300 comprises a battery pack 310, a sliding piece module 320 and a battery box 330,

referring to fig. 6, the battery case 330 includes an upper case 331, a lower case 332, an elastic member, and a limit button 333, the battery pack 310 is received in the lower case 332, and the upper case 331 covers the lower case 332;

referring to fig. 6, the upper case 331 is provided with a limiting cavity 331a, a limiting hole 331b and a pressing hole 331c are provided on a side surface of the upper case 331 away from the lower case 332, the limiting hole 331b and the pressing hole 331c are both communicated with the limiting cavity 331a, and a gap is provided between the pressing hole 331c and the limiting hole 331 b;

referring to fig. 6, the limit button 333 is accommodated in the limit cavity 331a, the limit button 333 includes a pressing portion 333a, a blocking portion 333b and a connecting portion 333c, the pressing portion 333a and the blocking portion 333b are respectively located at two ends of the connecting portion 333c, the connecting portion 333c is located in the limit cavity 331a, the pressing portion 333a penetrates through the pressing hole 331c, and the blocking portion 333b penetrates through the limit hole 331 b;

referring to fig. 6, the elastic member is accommodated in the position-limiting cavity 331a, two ends of the elastic member respectively abut against the connecting portion 333c and the bottom surface of the position-limiting cavity 331a, and the elastic member is configured to push the connecting portion 333c to move in a direction away from the bottom surface of the position-limiting cavity 331 a;

referring to fig. 6, a guiding chute 331d is formed on an outer side wall of the upper casing 331, a buckle 114 and a positioning slot 115 are arranged on the outer casing 110, the buckle 114 is embedded in the guiding chute 331d, and the blocking portion 333b is used for abutting against an inner side wall of the positioning slot 115;

referring to fig. 6, the sliding blade module 320 includes a switch blade 321 and a copper terminal 322, the switch blade 321 is disposed on the housing 110, the switch blade 321 is electrically connected to the motor 210 and the air pressure regulating assembly 700, the copper terminal 322 is disposed on the upper housing 331, the copper terminal 322 is electrically connected to the battery pack 310, and the switch blade 321 is used for being attached to the copper terminal 322.

Referring to fig. 6, when the latch 114 on the upper casing 331 is embedded in the guiding sliding slot 331d, the latch 114 can slide along the inner wall of the guiding sliding slot 331d, so that the positioning slot 115 of the upper casing 331 is continuously close to the blocking portion 333b of the limit button 333 until the blocking portion 333b is embedded in the positioning slot 115, the latch 114 cannot slide on the guiding sliding slot 331d, at this time, the power supply 300 is installed in place, the switch blade 321 is attached to the copper wiring terminal 322, that is, the battery pack 310 is communicated with the motor 210 and the air pressure regulating component 700 in the housing 100.

Referring to fig. 6, when the battery pack 310 in the power supply 300 is exhausted, the standby power supply 300 needs to be replaced, at this time, only the pressing portion 333a of the limit button 333 needs to be pressed, the elastic member is pressed and contracted, at this time, the limit button 333 sinks, the shift portion 333b sinks into the limit cavity 331a, a pushing force is applied to slide the power supply 300 out along the extending direction of the guide chute 331d, that is, the power supply 300 exhausted with the electric quantity is taken down, the standby power supply 300 is tightly attached to the holding portion of the housing 110 and then slides along the extending direction of the guide chute 331d until the shift portion 333b enters the positioning groove 115 under the action of the elastic member, the replaced power supply 300 is charged alone, the whole handheld electric air pump 10 does not need to be moved to the charging position for charging, and the handheld air pump 10 is suitable for continuous working conditions, more space is saved, and the charging is more convenient, meanwhile, because the power supply 300 and the housing 110 are in a separated structure, the volume of the power supply 300 is not limited by the housing 110, i.e., a larger battery pack with more sufficient electric quantity can be accommodated, meanwhile, the internal space of the housing 110 is saved, and the motor 210 with more power can be equipped, so that the output power of the handheld electric air pump 10 is improved.

Above-mentioned hand-held type electric air pump 10 is through setting up air pump body 100, transmission module 200, power 300, cylinder body 400 and piston 500, and transmission module 200 is used for driving piston 500 and carries out the pistoning in cylinder body 400 in order to aerify external part to adjust the structure of piston 500, reduce the swing amplitude in the piston motion process, thereby reduce the wearing and tearing volume of piston 500 and cylinder body 400 inner wall, and then improve the life of air pump.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A hand-held electric air pump, comprising:

the air pump body comprises a shell and a copper head, the shell is provided with an air outlet, the copper head is arranged on the inner side wall of the shell, and the copper head is communicated with the air outlet;

the transmission module comprises a motor, a driving gear and a reduction gear, the motor is contained in the shell, the driving gear is installed on an output shaft of the motor, the reduction gear is meshed with the driving gear, and an eccentric table is arranged on the reduction gear;

the power supply is arranged at one end of the shell, which is far away from the air outlet, and is electrically connected with the motor;

the cylinder body is provided with a transition cavity and an air cavity, the air cavity is communicated with the transition cavity, the copper head is connected with the outer wall of the cylinder body, and the copper head is communicated with the transition cavity;

the piston, the piston includes connecting rod, circumscribed ring and piston ring, the connecting rod reaches circumscribed ring is integrated into one piece structure, the circumscribed ring cover is located on the eccentric station, just the outer wall of eccentric station with the inner wall of circumscribed ring is tangent, the piston ring cover is arranged in the connecting rod is kept away from on one end of circumscribed ring, the piston ring is located in the air cavity, just the outer wall of piston ring with the inner wall of air cavity is hugged closely, and the motor is rotatory to be used for the drive the piston ring is followed the air cavity inner wall reciprocating motion.

2. The hand-held, electrically-powered air pump of claim 1 wherein said eccentric stage is of cylindrical construction.

3. The hand-held, electrically-powered air pump of claim 2 wherein the inner diameter of said circumscribing annulus is greater than the diameter of said eccentric table.

4. The hand-held electric air pump according to claim 1, wherein the piston ring comprises a fastening block and a deformation block, the fastening block is sleeved on the connecting rod, and the deformation block is arranged on the outer wall of the fastening block and clings to the inner wall of the air cavity.

5. The hand-held electric air pump of claim 4, wherein the fastening block and the deformation block are integrally formed.

6. The handheld electric air pump according to claim 4, wherein the shape-changing block is circular, and the outer diameter of the shape-changing block decreases from the end close to the transition cavity to the end far from the transition cavity.

7. The hand-held, electrically-powered air pump of claim 1 further comprising a one-way valve embedded within said transition chamber.

8. The hand-held electric air pump according to claim 1, wherein said housing is provided with a holding portion and a working portion, said motor is located in said holding portion, and said piston and said cylinder are located in said working portion.

9. The hand-held electric air pump according to claim 8, wherein an axis of the grip portion and an axis of the working portion are perpendicular to each other.

10. The hand-held electric air pump of claim 1, wherein said drive gear and said reduction gear are spur gears.

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