CN109944766B

CN109944766B - Inflator

Info

Publication number: CN109944766B
Application number: CN201910288962.4A
Authority: CN
Inventors: 王罗平
Original assignee: Kunshan Shiquan Plastic Hardware Products Co ltd
Current assignee: Kunshan Shiquan Plastic Hardware Products Co ltd
Priority date: 2019-04-11
Filing date: 2019-04-11
Publication date: 2024-01-30
Anticipated expiration: 2039-04-11
Also published as: CN109944766A

Abstract

The invention discloses an inflator, which comprises a tuyere head, a cylinder mechanism and an adjusting seat mechanism arranged between the tuyere head and the cylinder mechanism. The cylinder mechanism comprises a large cylinder fixed on the adjusting seat mechanism, a communicating pipe, a small cylinder sleeved between the large cylinder and the communicating pipe, a large end plug for closing the rear end of the small cylinder, a one-way air inlet end plug fixed on the large cylinder and sleeved on the small cylinder, a two-way piston fixed on the small cylinder and airtight abutted in the large cylinder, a one-way piston fixed on the communicating pipe and abutted in the small cylinder, and a rear check valve set arranged between the communicating pipe and the one-way piston. Through the structural design of the cylinder mechanism and the adjusting seat mechanism, the inflator can be switched between a double air inlet state with large inflation quantity and a single air inlet state which can be operated in a labor-saving way to perform high-pressure inflation when in use.

Description

Inflator

Technical Field

The invention relates to an inflator device, in particular to a manual inflator.

Background

At present, when a mini-inflator is used, the mini-inflator is usually held by one hand and is forced to be inflated by the other hand, because the mini-inflator is small in size, the holding operation is inconvenient, for example, the racing-vehicle inflator disclosed in chinese patent CN101737294 is inconvenient, the front end of the inner tube of the racing-vehicle inflator is fixed to the inflation nozzle, the outer tube can axially displace relative to the inner tube to inflate, when the inner tube is held by one hand, the hand holding the inner tube must interfere/prevent the movement of the outer tube to the front limit position, and in order to avoid the impact of the hand holding the inner tube when the outer tube moves forward, the user usually cannot operate the outer tube to produce the maximum travel of moving forward to the front limit position, so that the inflation efficiency is reduced. In addition, the inflator has only a single inflation mode, and high-pressure and labor-saving inflation is emphasized, so that no special consideration is given to the inflation amount, and the requirement of large air quantity in the low-medium pressure state at the initial stage of inflation cannot be met, so that the inflator is still quite inconvenient for a user.

Disclosure of Invention

It is an object of the present invention to provide an inflator that ameliorates at least one of the disadvantages of the prior art.

The aim of the invention is achieved by the following technical scheme:

the invention relates to an inflator, which comprises an air nozzle head, an adjusting seat mechanism which is arranged on the air nozzle head and can be switched between a single air inlet state and a double air inlet state, and an air cylinder mechanism which extends forwards and backwards and is arranged on the adjusting seat mechanism by the front end of the air cylinder mechanism. The cylinder mechanism comprises a large cylinder, a small cylinder, a communicating pipe, a large end plug, a one-way air inlet end plug, a two-way piston, a one-way piston and a rear check valve group, wherein the front end of the large cylinder is fixed in the regulating seat mechanism, the small cylinder is inserted in the large cylinder, the communicating pipe is inserted in the small cylinder, the front end of the communicating pipe is fixed in the regulating seat mechanism, the large end plug is used for sealing the rear end of the small cylinder, the one-way air inlet end plug is fixed at the rear end of the large cylinder and sleeved on the small cylinder, the two-way piston is fixed at the front end of the small cylinder and is hermetically plugged in the large cylinder, the one-way piston is communicated with the communicating pipe, is fixedly arranged at the rear end of the communicating pipe and is plugged in the small cylinder, and the rear check valve group is arranged between the communicating pipe and the one-way piston; when the cylinder mechanism stretches, the first space of the large cylinder sucks outside air through the adjusting seat mechanism, the second space of the large cylinder extrudes the air into the third space of the small cylinder, and the air is injected into the fourth space of the small cylinder through the one-way piston; when the cylinder mechanism is shortened, the one-way air inlet end plug and the rear check valve group are opened, the second space is used for sucking external air through the one-way air inlet end plug, the fourth space is used for injecting air into the communicating pipe through the one-way piston to be injected into the tuyere head, the adjusting seat mechanism in the single air inlet state can discharge air from the first space to the outside, and the adjusting seat mechanism in the double air inlet state can inject air from the first space into the tuyere head.

The inflator of the invention, the cylinder mechanism also comprises a handle pipe fixedly connected with the big end plug and sleeved outside the big cylinder in a relative displacement manner.

The invention relates to an inflator, which comprises an adjusting seat mechanism, a front check valve group, an exhaust switch group and a one-way air inlet valve group, wherein the adjusting seat mechanism is fixedly connected with a tuyere head and is connected with a large cylinder and a communicating pipe, the adjusting seat mechanism is provided with a first air filling hole, a second air filling hole, an air exhaust hole and an air inlet hole, the first air filling hole is communicated with the first space, the air exhaust hole is communicated with the outside, the air inlet hole is communicated with the outside, the second air filling hole is unidirectionally closed by positive pressure air in the first space, the exhaust switch group is operated to open the air exhaust hole, the one-way air inlet valve group is driven by the positive pressure air in the first space to close the air inlet hole, the air exhaust switch group is opened when the adjusting seat mechanism is in a single air inlet state, the air exhaust hole can exhaust the air from the first space to the outside, and the air outlet hole is driven by the positive pressure air in the first space when the adjusting seat mechanism is in a double air inlet state.

The air pump comprises an air pump body, an air pump body and an air pump, wherein the air pump body is characterized in that the air pump body is provided with an air pump hole, an air pump body is provided with a first space, a second space, a small-aperture section and a large-aperture section, the air pump hole is axially communicated with the first space, the small-aperture section is radially communicated with the communication section, the large-aperture section is coaxially communicated with the small-aperture section and the outside, the aperture is larger than the aperture of the small-aperture section, the air pump body is provided with an air pump switch group, the air pump body is provided with a sealing piece which is arranged in the large-aperture section and can seal the small-aperture section, the sealing piece is arranged in the adjusting seat body, when the adjusting seat mechanism is in a single air inlet state, the sealing piece is radially and inwards forced to seal the small-aperture section by the adjusting seat mechanism is separated from the sealing piece when the adjusting seat mechanism is in a double air inlet state, and the sealing piece can be pushed by positive pressure air in the small-aperture section.

The inflator of the invention, the regulating piece has a regulating ring part which can be operated and rotated to be sleeved outside the regulating seat body and cover the exhaust hole, and a pressing convex part which is radially arranged on the inner peripheral surface of the regulating ring part in a protruding way and can be radially pressed inwards to be pressed against the sealing piece in a linkage and separation way by the regulating ring part.

The second air filling hole is provided with a small-aperture section which is communicated with the first space in a front-back extending way and a large-aperture section which is larger than the small-aperture section and is communicated with the air nozzle head and the small-aperture section, the front check valve group comprises a check valve body which is arranged in the large-aperture section and is inserted into the small-aperture section, an airtight gasket which is sleeved on the check valve body, and an elastic piece which is arranged in the large-aperture section, and the elastic piece is constantly provided with elastic force for driving the check valve body to lean against the small-aperture section so that the check valve body and the airtight gasket are matched to seal the small-aperture section.

The air inlet hole of the inflator is provided with a large aperture section communicated with the first space and a small aperture section with the aperture smaller than the large aperture section and communicated with the large aperture section and the outside, the one-way air inlet valve group comprises a valve element which is movably arranged in the large aperture section and can be driven by positive pressure air in the first space to seal the small aperture section, and a communicating baffle element which is locally communicated with the large aperture section and the first space and is arranged in the adjusting seat body and limits the valve element in the large aperture section.

The one-way piston comprises a piston body fixed at the rear end part of the communicating pipe and provided with a shaft hole axially penetrating through and communicating with the fourth space, an airtight gasket axially movably sleeved on the piston body and airtight abutted against the inner circumferential surface of the small cylinder, the piston body is provided with an outer ring groove concavely arranged on the outer circumferential surface of the piston body and sleeved with the airtight gasket, and a communicating notch axially extending and communicating with the outer ring groove and the fourth space, the airtight gasket can close the communicating notch when the piston body moves backwards relative to the small cylinder and can open the communicating notch when the piston body moves forwards relative to the small cylinder, so that the third space is communicated with the fourth space, and the rear check valve is provided with an annular valve seat communicated between the communicating pipe and the shaft hole and a check valve piece arranged in the valve seat and capable of being driven by positive pressure gas in the fourth space to open and close the shaft hole.

The one-way air inlet end plug comprises an end block fixed at the rear end of the big cylinder and sleeved outside the small cylinder, and an airtight gasket arranged on the inner peripheral side of the end block and airtight sleeved against the small cylinder, wherein an inner ring groove for the airtight gasket to be embedded in an axially displaceable manner is concavely arranged on the inner peripheral surface of the end block, and an air inlet channel axially extending to communicate the inner ring groove with the outside is arranged on the inner peripheral surface of the end block, when the one-way air inlet end plug moves forwards relative to the small cylinder, the airtight gasket seals the air inlet channel, and when the one-way air inlet end plug moves backwards relative to the small cylinder, the airtight gasket opens the air inlet channel, so that the second space is communicated with the outside through the inner ring groove and the air inlet channel.

The beneficial effects of the invention are mainly as follows: through the structural design of the cylinder mechanism and the adjusting seat mechanism, the inflator can be selectively switched to a large-inflation-amount double-air-inlet state and a single-air-inlet state which can be operated in a labor-saving manner to perform high-pressure inflation when an object to be inflated is inflated, and is quite convenient and practical.

Drawings

Other features and advantages of the present invention will become apparent from the following description of the embodiments with reference to the drawings, in which:

FIG. 1 is a perspective view of a preferred embodiment of the pump of the present invention;

FIG. 2 is an exploded perspective view of the embodiment;

FIG. 3 is a fragmentary cross-sectional view of the embodiment;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 1, illustrating a vent switch assembly in a closed position;

FIG. 5 is a view similar to FIG. 4, illustrating the exhaust switch set in an open position;

FIG. 6 is a cross-sectional view of the embodiment taken along line B-B illustrating the pulling of a handle tube rearward relative to a large cylinder;

FIG. 7 is an enlarged view of a portion of view 6;

FIG. 8 is a view similar to FIG. 6, illustrating an adjustment seat mechanism in a dual intake condition when the handle tube is advanced relative to the large cylinder;

FIG. 9 is a cross-sectional view taken along line C-C of FIG. 1, illustrating the adjustment seat mechanism in a dual intake condition when the handle tube is advanced relative to the large cylinder;

FIG. 10 is an enlarged view of a portion of FIG. 8;

FIG. 11 is a view similar to FIG. 8, illustrating the adjusting seat mechanism in a single intake state when the handle tube is advanced relative to the large cylinder; and

Fig. 12 is a view similar to fig. 9, illustrating the adjusting seat mechanism in a single intake state when the handle tube is pushed forward with respect to the large cylinder.

Detailed Description

Before the present invention is described in detail, it is noted that in the following description, like components are denoted by the same reference numerals.

As shown in fig. 1, 2 and 3, an embodiment of the pump 200 of the present invention is suitable for inflating an object (not shown), such as, but not limited to, a tire or ball. The inflator 200 includes a nozzle 3, an adjusting seat mechanism 4 mounted and fixed to the nozzle 3, and a cylinder mechanism 5 extending back and forth and mounted and fixed to the adjusting seat mechanism 4 at its front end portion. The tuyere 3 is used for being installed on the object to be inflated and outputting gas for inflating the object to be inflated. Since the tuyere head 3 is of various types and is not the focus of the present invention, it will not be described in detail and is not limited to the drawings.

The adjusting seat mechanism 4 is operable to switch between a single air intake state and a double air intake state, and includes an adjusting seat body 40 fixedly connected between the tuyere head 3 and the cylinder mechanism 5, and a front check valve assembly 45, an exhaust switch assembly 46 and a one-way air intake valve assembly 47 mounted on the adjusting seat body 40.

As shown in fig. 3, 4, 5 and 9, the adjusting seat body 40 is internally provided with a first air filling hole 41 and a second air filling hole 42 which extend through and communicate the tuyere head 3 with the cylinder mechanism 5, an air discharging hole 43 which communicates the cylinder mechanism 5 with the outside, and an air inlet hole 44 which communicates the outside with the cylinder mechanism 5.

The first air filling hole 41 and the second air filling hole 42 can guide the air from the air cylinder mechanism 5 into the air nozzle 3. The second air filling hole 42 has a large aperture section 422 and a small aperture section 421 which extend back and forth and are respectively communicated with the air nozzle 3 and the air cylinder mechanism 5, and the apertures of the large aperture section and the small aperture section are different. The exhaust hole 43 has a communication section 431 extending forward and backward to communicate with the cylinder mechanism 5, a small aperture portion 432 radially communicating with the communication section 431, and a large aperture portion 433 extending coaxially and outwardly from the small aperture portion 432 to communicate with the outside and having an aperture larger than that of the small aperture portion 432. The air intake hole 44 has an outer communication section 442 extending back and forth and communicating with the outside, and an inner communication section 441 extending back and forth and communicating with the cylinder mechanism 5 and having a larger aperture than the outer communication section 442.

The front check valve group 45 is installed in the second air filling hole 42, and is capable of being driven to open by the positive pressure air from the cylinder mechanism 5 to unidirectionally close the second air filling hole 42. The front check valve set 45 includes a check valve body 451 disposed in the large aperture section 422 and inserted forward in the small aperture section 421, an airtight gasket 452 sleeved on the check valve body 451, and an elastic member 453 disposed in the large aperture section 422. The elastic member 453 has a constant elastic force that pushes the non-return valve body 451 forward, and drives the non-return valve body 451 to drive the airtight gasket 452 forward towards the small-aperture section 421, so that the non-return valve body 451 and the airtight gasket 452 cooperate to hermetically seal the small-aperture section 421.

The exhaust switch set 46 is operable to open and close the exhaust hole 43, and includes a closing member 461 disposed in the large aperture portion 433 of the exhaust hole 43 and closing the radially outer opening of the small aperture portion 432, and an adjusting member 462 disposed outside the adjusting housing 40. The adjusting member 462 has an adjusting ring 463 rotatably sleeved outside the adjusting base 40 and covering the air outlet 43, and a pressing protrusion 464 radially protruding from an inner circumferential surface of the adjusting ring 463, and the adjusting member 462 is operable to rotationally displace between a closed position (as shown in fig. 4) in which the pressing protrusion 464 is pressed radially inward against the closing member 461, and an open position (as shown in fig. 5) in which the pressing protrusion 464 is separated from the closing member 461.

When the adjusting seat mechanism 4 is to be adjusted to the dual intake state, the adjusting member 462 is adjusted to the closed position shown in fig. 4, so that the closing member 461 is forced to hermetically close the small aperture portion 432, the exhaust hole 43 is prevented from exhausting, and the front check valve set 45 is driven to open by the positive pressure gas from the cylinder mechanism 5, so that both the first gas filling hole 41 and the second gas filling hole 42 can be used to guide the positive pressure gas from the cylinder mechanism 5 into the tuyere head 3.

When the adjusting seat mechanism 4 is to be adjusted to the single air intake state, the adjusting member 462 is adjusted to the open position shown in fig. 5, so that the closing member 461 can be easily driven to open by the positive pressure air from the air cylinder mechanism 5, and the air outlet 43 can be externally exhausted, and the front check valve group 45 is not driven to open by the positive pressure air, but continuously closes the second air filling hole 42, so that only the first air filling hole 41 can guide the positive pressure air from the air cylinder mechanism 5 into the air nozzle head 3.

The one-way intake valve assembly 47 includes a valve member 471 movably disposed in the inner connecting section 441, and a connecting block 472 partially connecting the inner connecting section 441 with the cylinder mechanism 5 and disposed in the adjusting seat 40 to block the valve member 471 in the inner connecting section 441. The valve 471 can be driven by positive pressure gas from the cylinder mechanism 5 to close the outer communication section 442 forwards, and can be driven by negative pressure suction from the cylinder mechanism 5 to move backwards, so that the air inlet 44 is communicated with the outside and the cylinder mechanism 5.

As shown in fig. 2, 3 and 6, the cylinder mechanism 5 includes a large cylinder 51 extending back and forth and having its front end fixed to the adjusting seat body 40, a small cylinder 52 extending back and forth and inserted in the large cylinder 51, a communication pipe 53 extending back and forth and having its front end fixed to the adjusting seat body 40 and inserted in the small cylinder 52, a large end plug 54 fixed to the rear end of the small cylinder 52 and closing the rear end of the small cylinder 52, a grip pipe 55 fixed to the large end plug 54 and extending forward around the rear end of the large cylinder 51, a check inlet end plug 57 fixed to the rear end of the large cylinder 51 and fitted around the small cylinder 52, a two-way piston 56 fixed to the front end of the small cylinder 52 and having its airtight stopper fitted between the large cylinder 51 and the small cylinder 53, a one-way piston 58 fitted in communication with the communication pipe 53 and having its rear end fixed to the communication pipe 53 and fitted around the communication pipe 52 and a check piston 58 fitted between the small piston 58 and the communication pipe 53. Since the large end plug 54 closing the rear end of the small cylinder 52 is of a plurality of types, it will not be described in detail.

The bidirectional piston 56 partitions the inside of the large cylinder 51 into a first space 501 and a second space 502 on opposite sides thereof in the front and rear directions in the axial direction, respectively. The first space communicates with the small-aperture section 421 of the second air filling hole 42, and with the communicating section 431 of the air discharging hole 43.

As shown in fig. 2, 7 and 10, the one-way air inlet end plug 57 can be used for one-way communication between the second space 502 and the outside, and comprises an end block 571 fixed at the rear end of the large cylinder 51 and sleeved outside the small cylinder 52, and an airtight gasket 574 arranged on the end block 571 in a manner of being axially displaced back and forth and being airtight sleeved outside the small cylinder 52. The end block 571 has an inner ring groove 572 concavely provided on an inner circumferential surface thereof for the airtight gasket 574 to be inserted therein so as to be movable back and forth, and a plurality of air inlet channels 573 concavely provided on an inner circumferential surface thereof and spaced around an axial center thereof and extending rearward from the inner ring groove 572 to a rear end thereof for communicating with the outside, and the end block 571 is further provided with a communication channel (not shown) for communicating the second space 502 with the inner ring groove 572.

When the one-way air inlet end plug 57 moves forward relative to the small cylinder 52, as shown in fig. 7, the airtight gasket 574 moves backward and is limited due to the friction force of the inner peripheral surface of the small cylinder 52, so as to close the air inlet channel 573 and airtight isolate the second space 502 from the outside. When the one-way air inlet end plug 57 moves backward relative to the small cylinder 52, as shown in fig. 10, the airtight gasket 452 moves forward and is limited due to friction force, so that the inner ring groove 572 communicates with the outside through the air inlet channel 573, and the second space 502 communicates with the outside. Since the end plug structure capable of unidirectional communication between the second space 502 and the outside is designed in many ways, the structure of the unidirectional air inlet end plug 57 is not limited thereto.

The unidirectional piston 58 separates the small cylinder 52 from a third space 503 and a fourth space 504 which are respectively located at the front and rear opposite sides in the axial direction, and a through hole 520 is radially formed in the small cylinder 52 to communicate the second space 502 and the third space 503. The one-way piston 58 includes a piston body 581 fixed to the rear end portion of the communication pipe 53, and an airtight gasket 585 axially movably fitted around the piston body 581 and airtight abutted against the inner peripheral surface of the small cylinder 52. The piston body 581 has a shaft hole 582 axially penetrating the fourth space 504 and the communication pipe 53, an outer ring groove 583 recessed in the outer peripheral surface thereof for the airtight packing 585 to be fitted therein, and two communication notches 584 axially extending to communicate the outer ring groove 583 with the fourth space 504.

When the one-way piston 58 moves forward relative to the small cylinder 52, as shown in fig. 7, the airtight gasket 585 moves backward to limit due to the friction force of the inner circumferential surface of the small cylinder 52, so that the outer ring groove 583 communicates with the fourth space 504 via the communication notch 584, and further communicates with the third space 503 and the fourth space 504. When the one-way piston 58 moves backward with respect to the small cylinder 52, as shown in fig. 10, the airtight gasket 585 moves forward to limit due to friction force, and airtight seals the gap between the piston body 581 and the small cylinder 52, thereby airtight separating the third space 503 from the fourth space 504.

The third space 503 and the fourth space 504 are not limited to the above-mentioned structure, since the unidirectional piston 58 can unidirectional connect with a plurality of types.

The rear check valve group 59 has an annular valve seat 591 provided between the rear end of the communicating pipe 53 and the piston body 581 to communicate the communicating pipe 53 with the shaft hole 582, and a check valve member 592 provided in the annular valve seat 591 so as to be movable forward and backward. The annular valve seat 591 has an inner diameter greater than the bore 582 of the shaft bore of the piston body 581. The check valve member 592 is driven by the positive pressure gas in the communication pipe 53 to be pushed back against the piston body 581, thereby hermetically closing the shaft hole 582, that is, hermetically separating the communication pipe 53 from the fourth space 504. The check valve member 592 is also driven to open by the positive pressure gas in the fourth space 504, so that the annular valve seat 591 communicates the communication pipe 53 with the fourth space 504.

When the inflator 200 of the present invention is used, after the nozzle tip 3 is mounted on the object to be inflated, the user can operate the adjusting member 462 of the exhaust switch set 46 to selectively switch the entire adjusting seat mechanism 4 to the single air intake state or the dual air intake state. Then, the front end portion of the large cylinder 51 is held with one hand, and the grip tube 55 is held with the other hand, and then the grip tube 55 is pushed and pulled back and forth with respect to the large cylinder 51 to perform the pumping operation.

As shown in fig. 6 and 7, during the process of pulling the handle tube 55 backward with respect to the large cylinder 51, the small cylinder 52 drives the bidirectional piston 56 backward with respect to the large cylinder 51, the unidirectional air intake end plug 57 and the unidirectional piston 58 forward with respect to the small cylinder 52, the unidirectional air intake end plug 57 is closed, and the unidirectional piston 58 is opened. In this process, the first space 501 becomes gradually larger, the second space 502 becomes gradually smaller, the third space 503 becomes gradually smaller, and the fourth space 504 becomes gradually larger. The progressively larger first space 501 generates negative pressure suction force that urges the one-way valve assembly 47 open to draw ambient air through the intake port 44 in the direction of flow indicated by arrow 901. The second space 502, which is gradually smaller regardless of the double intake state of the seat mechanism 4, has the function of compressing the internal air into the third space 503 and compressing the internal air into the fourth space 504 via the check piston 58, as indicated by an arrow 901.

At this time, if the gas pressure in the fourth space 504 is smaller than the gas pressure in the communication pipe 53, the rear check valve group 59 is closed, and the fourth space 504 is pre-pressurized to store the gas; conversely, if the gas pressure in the fourth space 504 is greater than the gas pressure in the communication pipe 53, the positive pressure gas in the fourth space 504 drives the rear check valve group 59 to open, and the communication pipe 53 guides the positive pressure gas from the fourth space 504 to the tuyere head 3 for inflating the object to be inflated.

When the bi-directional piston 56 is restrained against the one-way inlet end plug 57, the pump 200 reaches its maximum extension. Then, the handle tube 55 is pushed forward relative to the large cylinder 51, so that the small cylinder 52 is driven to retract forward into the large cylinder 51, so that the cylinder mechanism 5 is shortened until the bidirectional piston 56 is limited forward and abuts against the adjusting seat structure, as shown in fig. 3.

As shown in fig. 8, 9 and 10, when the seat adjusting mechanism 4 is in the dual air intake state, the exhaust switch set 46 closes the exhaust hole 43, the one-way air intake end plug 57 is opened during the process of driving the small cylinder 52 to move forward relative to the large cylinder 51 by the handle tube 55, the one-way piston 58 is closed to hermetically separate the third space 503 from the fourth space 504, the first space 501 and the fourth space 504 are gradually reduced, and the second space 502 and the third space 503 are gradually enlarged. The second space 502, which gradually becomes larger, sucks in the outside air through the one-way air intake end plug 57 and injects the air into the third space 503 in the direction of the air flow as indicated by arrow 902. The fourth space 504, which is gradually smaller, compresses the internal air, and when the internal air pressure is greater than the air pressure in the communication pipe 53, the back check valve set 59 is driven to open, so that the positive pressure air is injected into the communication pipe 53 and the air flow direction of the air nozzle 3 is shown by arrow 902 through the first air filling hole 41. Meanwhile, because the exhaust hole 43 is closed, the first space 501, which is gradually smaller, compresses the internal air, and when the air pressure in the first space 501 is greater than the internal air pressure of the object to be inflated, which is connected to the nozzle tip 3, the positive pressure air in the first space 501 drives the front check valve set 45 to open, so that the air is injected into the nozzle tip 3 from the second air injection hole 42, as indicated by an arrow 902.

As shown in fig. 11 and 12, when the seat adjusting mechanism 4 is in the single air intake state, the air exhaust switch set 46 is opened to not close the air exhaust hole 43 any more, so when the first space 501 is compressed, the positive pressure air generated by the compression in the first space 501 drives the sealing member 461 in the air exhaust hole 43 to be ejected from the air exhaust hole 43 in the air flow direction indicated by the arrow 903, so that the air in the fourth space 504 is pressed into the communicating pipe 53 in the air flow direction indicated by the arrow 902, and the object to be inflated is inflated through the air nozzle 3.

Through the design that the adjusting seat mechanism 4 can be switched between the double air inlet state and the single air inlet state, when the adjusting seat mechanism 4 is switched to the double air inlet state, the compressed gas in the first space 501 and the fourth space 504 can simultaneously inflate the object to be inflated, and the air inflation device is suitable for inflating with a large amount of air when the interior of the object to be inflated is in a medium-low air pressure state, so that the inflation speed is improved. When the air pressure in the object to be inflated is higher than the predetermined air pressure and the small cylinder 52 is not easy to be pushed to perform the inflation, the adjusting seat mechanism 4 can be switched to the single air intake state, the air in the first space 501 is discharged, and the inflation is performed only by compressing the air in the fourth space 504, so that the high-pressure inflation is more labor-saving and easy to operate.

In summary, by the structural design of the cylinder mechanism 5 connected to the adjusting seat mechanism 4, the handle tube 55 held by the hand does not strike the other hand held at the front end of the adjusting seat mechanism 4 or the big cylinder 51 during the process of pushing the small cylinder 52 by pulling back and forth relative to the big cylinder 51, so that the small cylinder 52 can be pushed to the front limit position to generate the maximum inflation efficiency.

In addition, in cooperation with the design that the adjusting seat mechanism 4 can be switched between the double air inlet state and the single air inlet state, in the middle and low air pressure inflation stage of the object to be inflated, the adjusting seat mechanism 4 can be selectively adjusted to the double air inlet state with larger air inflow, and in the process of pushing and pulling in turn, a large amount of air can be compressed and injected into the object to be inflated, so that the inflation efficiency in the middle and low air pressure stage of the object to be inflated can be improved. When the object to be inflated is inflated to a predetermined pressure or higher, the adjusting seat mechanism 4 can be switched to the single air intake state, so that the compressed air in the first space 501 can be discharged through the air outlet 43, and the resistance of pressing the small air cylinder 52 into the large air cylinder 51 is reduced, so that the object to be inflated is more labor-saving when being inflated at a high pressure. Therefore, the pump 200 of the present invention is an innovative design that is quite convenient and practical, and can achieve the purpose of the present invention.

The above list of detailed descriptions is only specific to practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, but all simple equivalent changes and modifications within the scope of the present invention are included in the patent claims and the patent specification.

Claims

1. An inflator comprises a nozzle head, an adjusting seat mechanism fixed on the nozzle head, and a cylinder mechanism extending back and forth and mounted on the adjusting seat mechanism with the front end, and is characterized in that: the air cylinder mechanism comprises a large air cylinder, a small air cylinder, a communicating pipe, a large end plug, a one-way air inlet end plug, a two-way piston, a one-way piston and a back check valve group, wherein the front end of the large air cylinder is fixed in the adjusting seat mechanism, the small air cylinder is inserted in the large air cylinder, the communicating pipe is inserted in the small air cylinder and is fixed in the adjusting seat mechanism, the front end of the large end plug is fixed in the small air cylinder, the one-way air inlet end plug is fixed in the rear end of the large air cylinder and is sleeved on the small air cylinder, the two-way piston is fixed in the front end of the small air cylinder and is airtight plugged in the large air cylinder, the one-way piston is communicated with the communicating pipe and is plugged in the small air cylinder, and the back check valve group is arranged between the communicating pipe and the one-way piston; when the cylinder mechanism stretches, the first space of the large cylinder sucks outside air through the adjusting seat mechanism, the second space of the large cylinder extrudes the air into the third space of the small cylinder, and the air is injected into the fourth space of the small cylinder through the one-way piston;

when the cylinder mechanism is shortened, the one-way air inlet end plug and the rear check valve group are opened, the second space is filled with external air through the one-way air inlet end plug, the fourth space is filled with air into the air nozzle head through the one-way piston by injecting the air into the communicating pipe, the adjusting seat mechanism in the single air inlet state can discharge the air from the first space to the outside, and the adjusting seat mechanism in the double air inlet state can inject the air from the first space into the air nozzle head;

the regulating seat mechanism comprises a regulating seat body fixedly connected to the air nozzle head and connecting the large air cylinder with the communicating pipe, a front check valve group, an exhaust switch group and a one-way air inlet valve group, wherein the front check valve group, the exhaust switch group and the one-way air inlet valve group are arranged on the regulating seat body;

the exhaust hole is provided with a communication section axially communicated with the first space, a small-aperture section radially communicated with the communication section, and a large-aperture section coaxially communicated with the small-aperture section and the outside and having an aperture larger than that of the small-aperture section, the exhaust switch group is provided with a sealing piece arranged in the large-aperture section and capable of sealing the small-aperture section, and an adjusting piece arranged in the adjusting seat body, the sealing piece is radially and inwards forced to seal the small-aperture section by the adjusting piece when the adjusting seat mechanism is in the single air inlet state, and the adjusting piece is separated from the sealing piece when the adjusting seat mechanism is in the double air inlet state, and the sealing piece can be pushed by positive pressure gas in the small-aperture section;

the adjusting piece is provided with an adjusting ring part which can be operated to rotationally sleeved outside the adjusting seat body and covers the exhaust hole, and a pressing convex part which is radially protruded on the inner circumferential surface of the adjusting ring part and can be radially pressed inwards to be pressed against the sealing piece in a linkage and separation way by the adjusting ring part;

the one-way air inlet valve group comprises a valve element which is movably arranged in the large aperture section and can be driven by positive pressure gas in the first space to close the small aperture section, and a communication blocking piece which is partially communicated with the large aperture section and the first space, is arranged in the adjusting seat body and limits the valve element in the large aperture section.

2. The pump of claim 1, wherein: the cylinder mechanism also comprises a handle pipe fixedly connected with the large end plug and sleeved outside the large cylinder in a relative displacement manner.

3. The pump of claim 1, wherein: the second air filling hole is provided with a small-aperture section which is communicated with the first space in a front-back extending way, and a large-aperture section which is larger than the small-aperture section and is communicated with the tuyere head and the small-aperture section, the front check valve group comprises a check valve body which is arranged in the large-aperture section and is inserted in the small-aperture section, an airtight gasket which is sleeved on the check valve body, and an elastic piece which is arranged in the large-aperture section, and the elastic piece is constantly provided with an elastic force which drives the check valve body to lean against the small-aperture section so that the check valve body and the airtight gasket are matched to seal the small-aperture section.

4. The pump of claim 1, wherein: the one-way piston comprises a piston body fixed at the rear end part of the communicating pipe and provided with a shaft hole axially penetrating through and communicating with the fourth space, an airtight gasket axially movably sleeved on the piston body and airtight abutted against the inner circumferential surface of the small cylinder, the piston body is provided with an outer ring groove concavely arranged on the outer circumferential surface of the piston body and used for sleeving the airtight gasket, and a communicating notch axially extending and communicating the outer ring groove with the fourth space, the airtight gasket can seal the communicating notch when the piston body moves backwards relative to the small cylinder and can open the communicating notch when the piston body moves forwards relative to the small cylinder, so that the third space is communicated with the fourth space, and the rear check valve is provided with an annular valve seat communicated between the communicating pipe and the shaft hole and a check valve piece which is arranged in the valve seat and can be driven by positive pressure gas in the fourth space to open and seal the shaft hole.

5. The pump of claim 1, wherein: the one-way air inlet end plug comprises an end block fixed at the rear end of the large cylinder and sleeved outside the small cylinder, and an airtight gasket arranged at the inner peripheral side of the end block and airtight sleeved against the small cylinder, an inner ring groove for the airtight gasket to be embedded in an axially displaceable manner and an air inlet channel which is axially extended and communicated with the inner ring groove and the outside are concavely arranged on the inner peripheral surface of the end block, when the one-way air inlet end plug moves forwards relative to the small cylinder, the airtight gasket seals the air inlet channel, when the one-way air inlet end plug moves backwards relative to the small cylinder, the airtight gasket opens the air inlet channel, and the second space is communicated with the outside through the inner ring groove and the air inlet channel.