CN111336091A

CN111336091A - Portable inflator

Info

Publication number: CN111336091A
Application number: CN202010195294.3A
Authority: CN
Inventors: 刘良兵; 赵殿虎
Original assignee: Suzhou Beimi Technology Co Ltd
Current assignee: Suzhou Beimi Technology Co Ltd
Priority date: 2020-03-19
Filing date: 2020-03-19
Publication date: 2020-06-26

Abstract

The invention discloses a portable inflator, which comprises a shell provided with an air inlet and an air outlet, a motor, a piston and a cavity formed by the motor and the piston; the piston is connected with the motor through a torque transmission mechanism for switching the rotary motion of the motor into linear motion, the torque transmission mechanism comprises an output shaft driven by the motor to rotate, a rotary driving groove is formed on the side wall of one of the output shaft and the piston, a limiting hole or groove is formed on the other one of the output shaft and the piston, and a rolling piece which moves in the rotary driving groove in the rotation process of the output shaft and continuously switches the distance between the limiting hole or groove and the motor is limited in the limiting hole or groove. On the basis of retaining the automatic inflating function, the scheme adopts a mode that the rolling piece reciprocates in the convolution driving groove, has simple structure and small occupied space, creates favorable conditions for the miniaturization of the whole machine, and provides possibility for carrying. More ingeniously, the rolling connection mode can effectively reduce the abrasion and the heating between the piston and the output shaft, and is favorable for keeping the equipment to be used stably for a long time.

Description

Portable inflator

Technical Field

The present invention relates to the field of inflator devices, and more particularly to portable inflators.

Background

The inflating equipment is special equipment for inflating air bag, balloon, tyre and other products and is closely related to the daily life of people.

The existing inflating equipment is various in types, and mainly comprises manual inflating equipment and electric inflating equipment. In order to achieve the function of convenient carrying, the manual inflating equipment reduces the volume of the inflating equipment as much as possible in the form of the inflating equipment. However, the manual type inflating device has a small inflating cavity due to the reduction of the volume, so that when the manual type inflating device is used for inflating, a user is difficult to apply force to inflate the inflatable bag by holding the manual type inflating device with the hand, the volume of gas for one inflation is small, and the time and labor are wasted when the one inflation is completed.

Various electric inflating devices utilize motors and the like as power sources to drive pistons to move so as to achieve inflating, for example, "the electric inflating device" disclosed by the application number 200820169983.1 is a typical electric inflating device and comprises a cylinder body and a cylinder in the cylinder body, wherein a cylinder nut used for connecting an air nozzle is arranged on the cylinder, a battery pack and a motor form the power sources, an output shaft of the motor is connected with a gear pair, and the gear pair is connected with the piston of the cylinder through a connecting rod so as to achieve reciprocating motion of the piston. Such electronic equipment of inflating is bulky, and is inconvenient to carry. The axial of the most motors of the existing electric inflating equipment is in a vertical relation with the reciprocating motion direction of the piston, so that the motors and the cylinders are respectively positioned on two different axial directions and are distributed at a right angle, correspondingly, the electric inflating pump is large in size and large in occupied space, is inconvenient to carry about, and particularly for riding enthusiasts, the portable and convenient-to-use inflating equipment is needed urgently.

Although there are some electric pumping devices with relatively small size, such as the structure disclosed in application No. 2014202418421, the driving structure of this structure adopts a gear structure to convert the rotary motion of the motor into the linear motion of the piston, because the driven gear is perpendicular to the axis of the cylinder and is located below the cylinder, and a certain supporting structure is required to make it rotate, therefore, the area of the corresponding area of the cylinder needs to be large enough to effectively mount the driven gear, which results in the increase of the inner diameter of the whole cylinder, thereby hindering further miniaturization of the whole mechanism.

In addition, the volume of an air cavity formed between the piston rod and the piston cylinder is small, the amount of gas which can be filled into an object to be inflated by one-time reciprocating movement of the piston is small, and the inflation efficiency is low.

Disclosure of Invention

The present invention has been made to solve the above-mentioned problems occurring in the prior art, and an object of the present invention is to provide a portable inflator.

The purpose of the invention is realized by the following technical scheme:

a portable inflator comprising

A shell, wherein an air inlet and an air outlet are arranged on the shell;

the motor is arranged in the shell and used for providing power;

the piston is telescopically arranged in the shell and is driven by the motor, and a cavity is formed between the piston and the shell;

the piston is connected with the motor through a torque transmission mechanism for switching the rotary motion of the motor into linear motion, the torque transmission mechanism comprises an output shaft driven by the motor to rotate, a rotary driving groove is formed in the side wall of one of the output shaft and the piston, a limiting hole or groove is formed in the other one of the output shaft and the piston, and a rolling piece which moves in the rotary driving groove in the rotation process of the output shaft and continuously switches the distance between the limiting hole or groove and the motor is limited in the limiting hole or groove.

Preferably, in the portable inflator, the housing is a straight cylinder.

Preferably, the portable inflator has an overall diameter/length ratio of 14/150-30/100, preferably the housing has an outer diameter of less than 25mm and/or the housing has a length of no more than 200 mm.

Preferably, in the portable inflator, the housing, the motor, the piston, and the gas outlet are coaxial.

Preferably, in the portable inflator, a rotation prevention structure for limiting rotation of the piston is formed between the piston and an inner wall of the housing.

Preferably, in the portable inflator, the anti-twisting structure causes the piston to be slidably and/or rollably coupled to an inner wall of the housing.

Preferably, in the portable inflator, the anti-twisting structure includes at least a guide groove formed on an inner wall of the housing in parallel with an extending direction thereof, and a rolling member of the torque transmission mechanism is inserted into the guide groove.

Preferably, in the portable inflator, the anti-twisting structure includes a plurality of guide grooves formed on an inner wall of the housing in parallel with an extending direction thereof, and balls or needles rollingly inserted into the guide grooves, the balls or needles being defined in defined holes or grooves formed on a side wall of the piston.

Preferably, in the portable inflator, a battery for supplying power to the motor is arranged in the housing, and an axis of the battery is at least parallel to an axis of the motor.

Preferably, in the portable inflator, the circuit board of the housing is parallel to or coaxial with the axis of the motor.

The technical scheme of the invention has the advantages that:

1. on the basis of retaining the automatic inflating function, the scheme adopts multiple modes to convert the motor torque into the linear movement of the piston, can select specific driving structures according to different requirements, is flexible to apply, has simple driving structures and small occupied space, creates favorable conditions for the miniaturization of the whole machine, and provides possibility for carrying about. The driving mode that the rolling piece reciprocates in the convolution driving groove has the advantages, and more skillfully, the rolling connection mode can effectively reduce the abrasion and the heating between the piston and the output shaft, and is favorable for keeping the equipment to be used stably for a long time. Through the positive and negative rotation of the electronic control motor, the ball screw driving structure and the thread driving structure are combined, and the spiral groove and the rolling connection or sliding connection structure are adopted, so that an effective implementation mode is provided for the small-size driving structure, and meanwhile, the ball screw driving structure has the advantages of reducing abrasion and heating; and the thread driving structure can make the whole structure simpler and smaller, and the size is reduced to the maximum extent. The motor torque is converted into the linear movement of the piston by adopting various modes, a specific driving structure can be selected according to different requirements, the application is flexible, and the driving is realized.

2. The length and the outer diameter of the shell are set, so that the size of the whole machine can effectively meet the requirement of pocket type carrying, and the carrying of a user are greatly facilitated at any time.

3. The overall appearance of the scheme is in the shape of a cylinder pen, the appearance is simple and convenient, the ergonomic is facilitated, the handheld work is facilitated, and the use interest of a user can be increased.

4. The motor, the piston, the air outlet hole, the battery, the circuit board and the like are coaxially arranged, so that the internal structure can be more compact, the length and the pipe diameter of the shell can be reduced to the maximum extent, and the structure of the whole machine can be further reduced; and simultaneously, the wire connection is also facilitated.

5. The specially-made air inlet channel structure and the channel switch structure effectively ensure the realization of air inlet and air exhaust and provide a stable and reliable realization mode.

6. The piston and the shell or the output shaft are in rolling connection, and the rolling connection can effectively reduce the friction force between the piston and the shell, reduce the abrasion and the heating between parts and prolong the service life.

7. The rolling member in the drive structure can also form with the guide way cooperation of shells inner wall and prevent the structure of turning round to even do not set up solitary prevent turning round the structure also can realize preventing turning round and driven dual function, be favorable to simplifying the structure, it is overall structure littleer.

8. The cavity of this scheme is directly formed by piston and shell, does not need parts such as piston cylinder, has both simplified the structure, the volume of the increase air cavity of maximize under limited size condition again to increase single inflation volume, improvement inflation efficiency that can be very big.

Drawings

FIG. 1 is a cross-sectional view of the present invention;

FIG. 2 is a front view of the present invention;

FIG. 3 is a perspective view of the housing of the present invention;

FIG. 4 is a perspective view of the output shaft of the present invention;

FIG. 5 is a cross-sectional view of a third embodiment of a torque transmission mechanism of the present invention (the construction is illustrative only and not intended to be limiting);

FIG. 6 is a cross-sectional view of a fifth embodiment of the torque transmission mechanism of the present invention (the construction is illustrative only and not intended to be limiting);

FIG. 7 is a schematic end view of the present invention;

FIG. 8 is a perspective view of the piston of the present invention;

fig. 9 is an enlarged view of the area a in fig. 1.

Detailed Description

Objects, advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments. The embodiments are merely exemplary for applying the technical solutions of the present invention, and any technical solution formed by replacing or converting the equivalent thereof falls within the scope of the present invention claimed.

In the description of the schemes, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the embodiment, the operator is used as a reference, and the direction close to the operator is a proximal end, and the direction away from the operator is a distal end.

A portable inflator according to the present disclosure is described with reference to the accompanying drawings, as shown in fig. 1 to 3, and includes a housing 1, wherein the housing 1 is used for providing an installation space, and may be made of various feasible materials, such as plastic, metal, etc., and has various feasible shapes with a cavity inside, such as the shape of a conventional manual inflating device, or the shape of a housing of a gun drill, etc.

Preferably, the housing 1 is a straight cylinder, and the straight cylinder may be integrally formed by injection molding, or assembled by two semicircular members, or assembled by screwing, welding, gluing, interference fit, or the like of multiple sections of pipe fittings.

As shown in fig. 1-fig. 3, the housing 1 preferably includes a hollow tube 106 with two open ends, one end of the hollow tube 106 is provided with an end plate 105, the other end of the hollow tube 106 is detachably provided with an inflation head 101, and the inflation head 101 can be connected with the hollow tube 106 by a threaded connection or an interference fit. The cross section of the inflation head and the hollow tube 101 (the cross section obtained by cutting a plane parallel to the axis of the housing 1 as a cutting plane) may be in various feasible shapes, for example, the cross section of the housing 1 is a circle or an ellipse or a regular polygon with the number of sides not less than 4, preferably, the cross section of the straight cylinder is a circle, and the pipe diameters of different areas of the housing 1 may be the same or different, and are specifically designed according to the required internal structure.

The length and size of the housing 1 is an important factor for portability, and thus, in a preferred embodiment, the diameter/length ratio of the housing 1 is between 14/150 and 30/100. More preferably, the diameter of the housing 1 is not more than 25mm, still more preferably not more than 20 mm; meanwhile, the length of the shell 1 is preferably below 200mm, and further preferably below 180mm, the size of the whole device is only slightly larger than that of a pen, and the device can be placed in a pocket on clothes, so that the device can be conveniently carried around.

As shown in fig. 1, a motor 2 and a piston 3 driven by the motor to reciprocate along the extending direction of the housing 1 are disposed in the housing 1, the motor 2 may be any feasible motor, such as a servo motor, a stepping motor, etc., and even in some cases, a pneumatic motor may be used, the motor 2 is fixed in the housing 1 by a fixing seat (not shown in the figure), and the fixing seat is not rotatable relative to the housing 1. And the rotating shaft of the motor 2 is at least parallel to and preferably coaxial with the rotating shaft of the shell 1, so that the size of the inner cavity of the shell 1 can be effectively reduced, and the size of the whole shell 1 can be reduced. Of course, in other embodiments, the motor shaft of the motor 2 may be not parallel to the axis of the piston 3, i.e. in a vertical state, and in this case, the installation space required by the motor and the torque transmission mechanism is larger, so that the size of the whole inflating apparatus is increased accordingly.

As shown in fig. 1, a speed reducer 10 is disposed between the motor 2 and the piston 3, so as to control the rotation speed of the motor 2 and enhance the driving force, which is the prior art and will not be described herein, and meanwhile, it is preferable that a power output shaft 1001 of the speed reducer 10 is coaxial with an axis of the motor 2.

In addition, the motor 2 drives the piston 3 to reciprocate through a torque transmission mechanism for converting the torque thereof into linear movement, and the torque transmission mechanism can be implemented in various ways.

In a first possible embodiment, as shown in fig. 1, the torque transmission mechanism includes an output shaft 11, the output shaft 11 is coaxially connected to a power output shaft 1001 of the speed reducer 10, and the output shaft 11 is connected to the power output shaft 1001 in a manner of screwing, interference fit connection, or the like.

As shown in fig. 1 and 4, a convolution driving groove 1101 is formed on a circumferential wall of the output shaft 11, and the convolution driving groove 1101 is a closed annular groove, a front end of the output shaft 11 is inserted into the insertion groove 31 of the piston 3, meanwhile, the output shaft 11 is hollow, and a side wall thereof has an opening 1102, and the opening 1102 is communicated with a front port 1103 of the output shaft 11 so as to facilitate dredging of air pressure inside the piston 3.

As shown in fig. 1 and 8, a limit hole or groove 306 is formed on a groove wall of the insertion groove 31 of the piston 3, a rolling member 12, such as a steel ball or a steel needle, is rollably disposed in the limit hole or groove 306, the steel ball or the steel needle protrudes out of the limit hole or groove 306 and is embedded into the convolution driving groove 1101, so that when the motor 2 drives the output shaft 11 to rotate, the steel ball or the steel needle moves in the convolution driving groove 1101 without switching positions, because the distance from the steel ball or the steel needle to the motor is repeatedly changed from far to near and from near to far when the steel ball or the steel needle is at different positions of the convolution driving groove 1101, and the steel ball or the steel needle is limited on the piston 3, the steel ball or the steel needle moves left and right to drive the piston 3 to move, and the steel ball or the steel needle, the piston 3 and the output shaft 11 have rolling friction, which can effectively reduce friction and abrasion, avoid the overheated electric elements work such as motor of influence in the cavity, be favorable to prolonging the life of spare part simultaneously.

In a second possible embodiment, the piston 3 may also be coaxially inserted into a slot (not shown in the figure) of the output shaft 11, and correspondingly, the rotary driving groove 1101 is formed on the outer wall of the piston 3, and a limit groove or hole for limiting the ball or roller 12 is provided on a groove wall of the slot of the output shaft 11.

In a third possible embodiment, as shown in fig. 5, the torque transmission mechanism includes the output shaft 11, the output shaft 11 is also coaxially inserted into the slot 31 at the tail of the piston 3, and an external thread 111 (equivalent to an external thread slot) is formed on the circumferential wall of the output shaft 11, an internal thread 32 matching the external thread 111 is formed on the slot wall of the slot 31 of the piston 3, and the connection structure between the internal thread and the external thread is a sliding friction connection manner. Meanwhile, the piston 3 is restricted from rotating with respect to the housing 1 by an anti-twisting structure, the specific anti-twisting structure of which will be described in detail below.

At this time, when the motor 2 needs to drive the output shaft 11 to rotate forward and backward by alternating forward and backward rotation, the threads engaged with the piston 3 and the output shaft 11 can effectively drive the piston 3 to move left and right relative to the output shaft 11 when the output shaft 11 rotates forward and backward.

Of course, in a fourth possible embodiment, the external thread of the third embodiment may be disposed on the outer wall of the piston 3, and the internal thread may be disposed on the output shaft 11.

In a fifth possible embodiment, as shown in fig. 6, a ball screw structure is formed between the output shaft 11 and the piston 3, for example, a rotary driving groove 112 is formed on the outer wall of the output shaft 11, in this case, the rotary driving groove is not annular, a limiting groove or hole 34 for limiting at least one rolling member 12 is formed on the groove wall of the insertion groove 31 of the piston 3, and the rolling member 12 forms rolling friction between the piston and the output shaft 3. Meanwhile, the piston 3 is restrained from rotating with respect to the housing 1 by an anti-rotation structure, which will also be described in detail below.

At this time, the motor 2 also needs to drive the output shaft 11 to rotate forward and backward through the staggered forward and backward rotation, so as to drive the piston 3 to move left and right relative to the output shaft 11. And with a structure similar to a lead screw, friction and heat generation between the output shaft 11 and the piston 3 can be effectively reduced. Of course, the spiral groove may be provided on the piston, and the limit groove or hole may be provided on the output shaft 11.

Of course, in another embodiment, the motor 2 and the torque transmission mechanism may also form a structure similar to that of an existing electric push rod, and the push rod is connected to the piston, so that the reciprocating movement of the push rod can drive the piston to reciprocate linearly.

Further, when the axis of the motor 2 is perpendicular to the axis of the housing 1, at this time, the motor 2 may drive the piston 3 to reciprocate through a crank-link mechanism or the like, which is known in the art and will not be described in detail herein, and correspondingly, the size of the whole machine is larger than that of the coaxial embodiment.

The anti-twisting structure of the piston 3 may be implemented in various ways, and in one possible way, at least one guide block (not shown) is formed on a side wall of the piston 3, and guide grooves corresponding to the guide blocks in a one-to-one manner are formed on an inner wall of the housing 1, so that the guide blocks can slide in the guide grooves in a reciprocating manner to limit the rotation of the piston 3 when the piston 3 reciprocates. Of course, the above-mentioned guide block may be provided on the inner wall of the housing 1, and the guide groove may be provided on the side wall of the piston 3.

However, in the above-mentioned anti-twisting structure, the guide block and the piston are slidably connected with the inner wall of the housing 1, and since a large amount of sliding friction exists between the piston 3 and the inner wall of the housing 1 during the reciprocating movement, which is obviously disadvantageous for the prolonging of the service life of each part and the heat dissipation in the housing, it is obviously necessary to adopt rolling friction between the piston 3 and the inner wall of the housing 1 to reduce the friction in a more preferred embodiment.

In a possible mode, as shown in fig. 5 and fig. 6, at least one guide groove 107, preferably a plurality of guide grooves 107, and more preferably at least three guide grooves and arranged in a polygonal shape, may be provided on the inner wall of the housing 1, a plurality of limiting holes or grooves 33 corresponding to the positions of each guide groove 107 are formed on the outer circumferential wall of the piston 3, a plurality of limiting holes or grooves 33 corresponding to each guide groove are formed on the piston 3, a ball or needle roller 20 is defined in the limiting holes or grooves 33, and the ball or needle roller 20 is simultaneously inserted into the corresponding guide groove 107 and maintains a micro gap between the inner wall of the housing 1 and the outer wall of the piston 3, so as to achieve the rolling connection between the piston 3 and the housing 1.

Of course, the above-mentioned guide groove 107 can also be provided on the side wall of the piston 3, and the limiting hole or groove 33 can also be provided on the inner wall of the housing 1.

In a more preferred embodiment, as shown in fig. 1, the rolling elements 12 in the rotary driving groove 1101 also protrude out of the two openings of the fixing through hole 306 formed in the piston 3 and are fitted into the guide groove 107 formed in the inner wall of the housing 1, in which case part of the defining groove or hole 33 and the balls or needles may be omitted.

As shown in fig. 1, a cavity 5 is formed between the piston 3 and the housing 1 and a one-way control structure 4 in the gas outlet head 101 disposed at the front end of the housing 1, which only allows gas to be discharged from the inside of the housing 1 to the outside of the gas outlet head 101, and the reciprocating movement of the piston 3 continuously sucks external gas into the cavity 5 and compresses the gas before discharging the gas from the gas outlet of the gas outlet head 101.

The entry of the external air into the cavity 5 can be achieved by various structures, and in a possible manner, for example, an air inlet (not shown in the figure) is formed on the housing 1, the air inlet is located on the side wall of the housing 1 and between the piston 3 and the air outlet 101, and the air inlet is still spaced from the piston 3 when the piston 3 moves to the foremost end, and the air inlet is connected to a one-way valve (not shown in the figure) located in the housing 1, and the one-way valve is a one-way valve in which the air can only flow into the housing 1 from the outside of the housing, but cannot flow out of the housing from the inside of the housing, which is known in the art and will not be described in detail herein.

In a further alternative embodiment, as shown in fig. 1, the external air is introduced into the chamber 5 through an inlet channel 6, i.e. the chamber 5 is connected to an inlet 102 on the housing 1 through the inlet channel 6, the inlet channel 6 being open in the first position of the piston 3 and closed in the second position of the piston 3.

Here, the structure of the intake passage 6 and the control structure of the on-off thereof are the difficulties achieved by the present solution, and the inventor has obtained a feasible structure through a great deal of creative work, as detailed below:

as shown in fig. 3, fig. 7 and fig. 8, the air inlet 102 is provided on an end plate 105 of the housing 1, the air inlet channel 6 includes at least one air inlet groove 103 formed on an inner wall of the housing 1, preferably, the air inlet groove 103 is multiple, and the shape of the air inlet groove may be a triangular groove or an arc groove, wherein the triangular groove may be used as a limiting structure to mount a corresponding mounting seat and prevent the mounting seat from rotating. The air inlet groove 103 is communicated with a first ventilation groove 301 on the outer wall of the piston 3, here, the air outlet end of the air inlet groove 103 is communicated with the inner cavity of the housing 1, and the air inlet end of the first ventilation groove 301 is communicated with the inner cavity of the housing 1 to realize the communication between the air inlet groove 103 and the first ventilation groove 301.

As shown in fig. 8, the piston 3 is further provided with a recessed groove 302 located at the front end of the first vent groove 301, a second vent groove 303 is provided at the bottom of the recessed groove 302, and the second vent groove 303 communicates with a vent hole 305 in a top plate 304 at the front end of the piston 3. The outside air enters the housing 1 from the air inlet 102 and enters the inner cavity of the housing 1 through the air inlet slot 103, when the first ventilation slot 301 and the second ventilation slot 303 are communicated, the air inlet channel 6 is conducted, and the air in the inner cavity of the housing 1 enters the cavity 5 from the first ventilation slot 301, the second ventilation slot 303 and finally the ventilation hole 305.

On the contrary, when the first ventilation groove 301 and the second ventilation groove 303 cannot communicate with each other, the air intake passage 6 is closed, and air in the inner cavity of the housing 1 cannot enter the cavity 5.

As shown in fig. 1 and fig. 9, the air inlet channel 6 is opened and closed by a sealing ring 7 located in the groove 302 and having a width smaller than that of the groove 302, specifically, by the sealing ring 7 blocking the air outlet end of the first vent groove. As shown in fig. 2 and 3, the sealing ring 7 may be made of various sealing materials, and it is tightly attached to the inner wall of the housing 1 to achieve sealing, and since the width of the sealing ring 7 is smaller than the width of the groove 302, the sealing ring 7 will follow the piston 3 to perform a certain displacement in addition to reciprocating in the groove 302 during the reciprocating movement of the piston 3.

When the piston 3 moves to the left (moves to the first position), the sealing ring 7 is tightly attached to the first side surface 3022 of the groove 302, and at this time, the first vent groove 301 and the second vent groove 303 are communicated, so that the gas enters the cavity 5, namely, the action of pulling the piston outwards to suck the gas in the cavity is similar to that of the traditional inflating device.

When the piston 3 moves to the right (moves to the second position), the sealing ring 7 is tightly attached to the second side surface 3021 of the groove 302, the sealing ring 7 seals the air outlet end of the first vent groove 301, the first vent groove 301 cannot be communicated with the second vent groove 302, at this time, the vent pipeline 6 is closed, at this time, the piston 3 compresses the air in the cavity 5, and the air is discharged from the air outlet head 101, so that air inflation is realized.

Of course, in other embodiments, the sealing ring 7 may not move synchronously with the piston 3, but just fit against both sides of the groove 302

As shown in fig. 1, the one-way control structure 4 disposed in the gas outlet head 101 is a one-way valve, and includes a valve body 401 and a spring 402, wherein the valve body 401 is connected to the spring 402 and abuts against the gas outlet of the cavity 5 under the elastic force of the spring 402. For the convenience of mounting and dismounting, the gas outlet head 101 is in threaded connection with the shell 1. The air outlet inner wall in the center of the air outlet head 101 is provided with threads to adapt to different types of connectors for inflating.

As shown in fig. 1, in order to provide electric energy for the motor 2, a battery 8 for supplying electric energy to the motor 2 is arranged in the housing 1, an axis of the battery 8 is parallel to an axis of the motor 2, and when one battery 8 is arranged, the battery is arranged coaxially with the motor 2; when the battery 8 is plural, they are distributed in a ring shape. Also, preferably, the battery 8 is located between the motor 2 and an end plate 105. The battery 8 may be any known battery, preferably a rechargeable battery.

As shown in fig. 7, a charging port 104 electrically connected to the battery 8 is disposed on the housing 1, the charging port 104 may be any known power source interface, such as any USB interface, and more preferably, a type-c interface, a ligning interface, or the like, and the charging port 104 may also be used to directly connect an external power source to supply power to the motor 2. The rechargeable battery is more environment-friendly to use, the battery is prevented from being replaced for many times due to the arrangement of the charging port, the rechargeable battery is more convenient for daily use of a user, and the rechargeable battery is beneficial to protecting the environment. Of course, the charging interface may be used for charging the battery 8 and directly supplying power to the motor through a circuit structure on the circuit board, that is, when the charging interface is connected to the commercial power through the connection line and the charging interface 104, the motor is supplied with power through the commercial power and the battery 8 is charged at the same time, otherwise, when the connection line is not provided, the motor is supplied with power through the battery 8, and the circuit structure here is a known technology and is not described in detail.

The existence of the charging port 104 is obviously disadvantageous to waterproof and dustproof, and in other embodiments, the charging port 104 may be omitted, so that the battery can be charged by taking the battery out of the housing, which is a known technology and is not described herein.

As shown in fig. 7, the housing 1 has a start-stop switch 9, and the motor 2 is electrically connected to and controlled by the start-stop switch 9. For the sake of aesthetic appearance, the charging port 104 and the start/stop switch 9 are both provided on the tail cover 105 of the housing 1 together with the air inlet 102. In other embodiments, the charging port 104 and the start/stop switch 9 may be disposed at other positions.

Meanwhile, in other implementations, a corresponding start-stop switch can be omitted, and a remote control mode is adopted to control the start and stop of the motor, for example, the start and stop of the motor are controlled by a remote control system of a conventional internet of things system such as infrared remote control, wireless communication or bluetooth communication, or even the start and stop of the motor can be controlled by a language control mode, and the specific implementation structures of the remote control, the language control and other control modes are known technologies, which are not innovation points of the scheme, and are not described herein.

As shown in fig. 1, the start-stop switch 9 and the charging structure are both connected to a circuit board 30, and the circuit board is located between the battery 8 and the end plate 105, and the axis of the circuit board is at least parallel to the axis of the housing 1, so that the arrangement structure of the circuit board, the battery and the motor can effectively facilitate wiring and make the internal structure more compact, thereby facilitating the miniaturization of the whole machine.

The invention has simple and exquisite structure, controls the piston 3 to inflate quickly by using the motor 2, improves the inflating efficiency of inflating equipment, reduces the using difficulty and saves time and labor. The straight cylinder type appearance of the inflating equipment is convenient for human engineering, is beneficial to being held by hands and is convenient to carry.

The invention has various embodiments, and all technical solutions formed by adopting equivalent transformation or equivalent transformation are within the protection scope of the invention.

Claims

1. A portable inflator comprising

A shell (1) which is provided with an air inlet and an air outlet;

the motor (2) is arranged in the shell (1) and used for providing power;

the piston (3) is arranged in the shell (1) in a reciprocating telescopic manner and is driven by the motor (2), and a cavity (5) is formed between the piston and the shell (1);

the method is characterized in that: the piston (3) is connected with the motor (2) through a torque transmission mechanism for switching the rotary motion of the motor into linear motion, the torque transmission mechanism comprises an output shaft (11) driven by the motor (2) to rotate, a rotary driving groove (1101) is formed in the side wall of one of the output shaft (11) and the piston (3), a limiting hole or groove is formed in the other one of the output shaft and the piston, and a rolling piece which moves in the rotary driving groove in the rotation process of the output shaft and continuously switches the distance between the rolling piece and the motor (2) is limited in the limiting hole or groove.

2. The portable inflator of claim 1, wherein: the shell (1) is in a straight cylinder shape.

3. The portable inflator of claim 2, wherein: the diameter/length ratio of the whole machine is between 14/150 and 30/100.

4. The portable inflator of claim 1, wherein: the shell (1), the motor (2), the piston (3) and the air outlet are coaxial.

5. The portable inflator of any one of claims 1 to 4, wherein: an anti-twist structure for limiting the rotation of the piston (3) is formed between the piston (3) and the inner wall of the shell (1).

6. The portable inflator of claim 5, wherein: the anti-twist structure enables the piston (3) to be in sliding connection and/or rolling connection with the inner wall of the shell (1).

7. The portable inflator of claim 5, wherein: the anti-twisting structure at least comprises a guide groove which is formed on the inner wall of the shell (1) and is parallel to the extending direction of the guide groove, and rolling pieces in the torque transmission mechanism are embedded into the guide groove.

8. The portable inflator of claim 5, wherein: the anti-twisting structure comprises a plurality of guide grooves formed on the inner wall of the housing (1) and parallel to the extending direction of the guide grooves, and balls or rolling needles which are rolled and embedded in the guide grooves and are limited in limiting holes or grooves formed on the side wall of the piston (3).

9. The portable inflator of any one of claims 1 to 4, wherein: a battery for supplying power to the motor is arranged in the shell (1), and the axis of the battery is at least parallel to the axis of the motor.

10. The portable inflator of any one of claims 1 to 4, wherein: the circuit board of the shell (1) is parallel or coaxial with the axis of the motor.