Inflator

Abstract

The utility model belongs to the technical field of inflators, and particularly relates to an inflator which comprises a base, an air pipe, an inflation piston assembly and an inflation nozzle are detachably arranged on the base, an airflow channel is arranged on the base, the air pipe comprises an inner pipe and an outer pipe, the outer pipe is arranged on the periphery of the inner pipe in a sleeved mode, and an outer cavity is formed between the outer pipe and the inner pipe. The inflation piston assembly comprises a grip and a middle pipe, the middle pipe is arranged in the outer pipe in a penetrating mode and arranged on the periphery of the inner pipe in a sleeving mode, a large piston is arranged on the middle pipe, the large piston is arranged in the outer cavity and connected with the inner pipe in a sealed mode, and air can enter the outer cavity through a gap between the outer pipe and the middle pipe. Air in the outer cavity is driven by the large piston to enter the airflow channel through the one-way valve; an air inlet is formed in the middle pipe, a sealing device is arranged on the middle pipe, and a small piston and a check valve are arranged on the inner pipe.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of inflator, in particular to an inflator. BACKGROUND

[0002] The inflator is a kind of air pump, and air is sucked into storage part by pulling mode, and then air required by various tires and some balls is injected or supplemented by pushing mode.

[0003] In order to fill high-pressure air into tire or ball, the inflator is mostly provided with piston and one-way valve, such as the new inflator disclosed by Chinese utility model patent application CN 202121243389.4, which comprises: a whole assembly, including inflator body, first outer thread is arranged on the outer wall of the inflator body, second outer thread is arranged on the outer wall of the inflator body, away from the first outer thread, air inlet hole is arranged on the outer wall of the inflator body, near the first outer thread; bottom assembly, including base connected with the inflator body by first inner thread cooperating with first outer thread; connecting assembly, including connecting circular table connected with the inflator body by second inner thread cooperating with second outer thread, the outer wall of the connecting circular table is provided with air outlet pipe, and the outer wall of the air outlet pipe is provided with third outer thread; operating assembly, including push-pull rod movably sleeved in the connecting circular table, and the push-pull rod is located in the interior of the inflator body and the connecting circular table; one end of the push-pull rod located in the interior of the inflator body and the connecting circular table is fixedly connected with the piston, and the piston abuts against the one-way valve fixedly connected with the base; the outer wall of the one end of the push-pull rod away from the piston is fixedly connected with operating rod; the connecting circular table is provided with auxiliary assembly.

[0004] Although the above structure can quickly balance the air pressure inside and outside the inflator body when the inflation is finished, but since air needs to pass through the one-way valve during the inflation process, the resistance during the inflation is always large, which affects the inflation rate of the inflator. SUMMARY

[0005] In order to overcome the defects in the prior art, the purpose of the utility model is to provide an inflator which can be quickly inflated and is convenient for users to use.

[0006] The purpose of the utility model is achieved in that:

[0007] A pump, comprising a base, a gas pipe, an inflation piston assembly and an inflation nozzle detachably arranged on the base, the base is provided with a gas flow channel connecting the gas pipe and the inflation nozzle, the gas pipe comprises an inner pipe and an outer pipe, the inner pipe is provided with an inner cavity communicated with the gas flow channel, the outer pipe and the inner pipe form an outer cavity, and a one-way valve is arranged between the outer cavity and the gas flow channel, the inflation piston assembly comprises a handle and a middle pipe, the middle pipe is arranged in the outer pipe and is sleeved on the outer periphery of the inner pipe, the middle pipe is provided with a large piston, the large piston is arranged in the outer cavity and is sealingly connected with the inner pipe, air can enter the outer cavity through the gap between the outer pipe and the middle pipe, and the air in the outer cavity is driven by the large piston to enter the gas flow channel through the one-way valve.

[0008] The middle pipe is provided with an air inlet hole communicated with the inner cavity of the middle pipe, the middle pipe is provided with a sealing device for sealing the air inlet hole, the inner pipe is provided with a small piston and a check valve, and the inner cavity is connected with a sealing port, and the check valve is arranged on one side of the sealing port.

[0009] The utility model further sets up: sealing device includes sealing bead and rotationally arranged on inflation piston assembly's knob, be provided with cam portion on the knob, rotation knob, cam portion can drive sealing bead to seal air inlet hole.

[0010] The utility model further sets up: be provided with articulated link on the knob, be provided with articulated hole matched with articulated link on inflation piston assembly, and inflation piston assembly is detachably provided with limit pin, and be provided with annular or arc limit slot on the side wall of articulated link, limit pin is arranged in limit slot and limit articulated link axial movement in articulated hole.

[0011] The utility model further sets up: be provided with limit swing groove on inflation piston assembly, be provided with limit convex matched with limit swing groove on the knob, limit swing groove and limit convex cooperate can limit the rotation range of knob, and control limit convex swing in limit swing groove, cam portion can drive sealing bead movement, and make articulated hole keep sealed state and communication state.

[0012] The utility model further sets up: be provided with sealing plug fixed on the middle pipe and sealed to the upper end of middle pipe, air inlet hole is arranged on the sealing plug, and one side of sealing plug is provided with the accommodation groove of installing sealing bead, cam portion is arranged on one side of accommodation groove and avoids sealing bead from separating from accommodation groove.

[0013] The utility model further sets up: sealing device is movably arranged on inflation piston assembly, be provided with positioning piece and elastic piece on sealing device, be provided with two positioning slots matched with positioning piece on inflation piston assembly, and elastic piece drives positioning piece to cooperate with two positioning slots respectively can make sealing device and inflation piston assembly relative fixed, and make articulated hole keep sealed state and communication state;External force acts on sealing device, positioning piece can be separated from positioning slot and make sealing device and inflation piston assembly relative movement.

[0014] The present invention is further configured such that: a support block is provided at the end of the inner tube, a movable cavity is provided on the small piston, the inner cavity is connected to the sealing port through the movable cavity, the check valve is a sealing sheet movably disposed in the movable cavity, the support block can prevent the check valve from detaching from the movable cavity, and can support the check valve, thereby preventing the check valve from sealing the inner cavity.

[0015] The present invention is further configured such that: the small piston includes a second piston seat, the movable cavity is disposed in the second piston seat, and a fixing groove for installing the support block is provided on one side of the movable cavity; the inner tube is threadedly connected to the second piston seat and the support block is pressed against the fixing groove.

[0016] The present invention is further configured such that: the large piston is provided with a guide hole that is slidably connected to the inner tube, one end of the guide hole is provided with an installation groove, the installation groove is provided with a third sealing ring for sealing the gap between the guide hole and the inner tube, and a pressure block is detachably provided on the large piston, the pressure block abutting the third sealing ring against the installation groove.

[0017] The present invention is further configured such that: the outer periphery of the pressure block is provided with a plurality of snap-fit ​​protrusions, the side wall of the mounting groove is provided with a plurality of snap-fit ​​grooves adapted to the snap-fit ​​protrusions, and the end of the mounting groove is provided with a guide surface, the snap-fit ​​protrusions are guided into the mounting groove through the guide surface and cooperate with the snap-fit ​​grooves.

[0018] The advantages of this utility model compared to the prior art are:

[0019] 1. The air pump of this utility model has an inner cavity and an outer cavity. Air in the outer cavity can enter the airflow channel through a one-way valve, while air in the inner cavity can directly enter the airflow channel. The sealing device in this structure can seal the inner cavity, preventing air from entering the inner cavity through the air inlet or escaping from the inner cavity. When inflating a tire or ball, high pressure is not required. At this time, the air inlet can be opened. During inflation, air can directly enter the airflow channel through the inner cavity under the drive of the small piston, or it can enter the airflow channel through the outer cavity and the one-way valve under the drive of the large piston. During this process, the inflation volume is large, and rapid inflation can be performed. When it is necessary to increase the air pressure in the tire or ball, the air inlet is sealed. Air can only enter the airflow channel through the outer cavity and the one-way valve under the drive of the large piston. This process is conducive to filling the tire or ball with high-pressure gas and increasing the air pressure in the tire or ball. Users can flexibly adjust the use of the air pump according to their needs, which facilitates the flexible use of the air pump.

[0020] 2、The setting of the knob and the sealing bead is convenient for a user to control the sealing and opening of the air inlet hole, facilitates the flexible use of the inflator, the cam part is simple in structure and facilitates the production and processing of the knob, the setting of the hinged rod, the hinge hole, the limiting pin and the limiting groove facilitates the stable rotation of the knob, avoids the influence of the axial movement of the knob on the connection and cooperation of the cam part and the sealing bead in the use process, and is convenient for a user to control the sealing and opening of the air inlet hole.

[0021] 3、The setting of the limiting swing groove and the limiting protrusion can limit the rotation angle of the knob, avoids the influence of the too large rotation angle of the knob on the sealing of the hinge hole, and is convenient for a user to use, the setting of the sealing plug is favorable for improving the sealing property of the middle pipe, the setting of the storage groove facilitates the stable movement of the sealing bead, avoids the influence of the deflection and misplacement of the sealing bead on the sealing of the sealing bead to the air inlet hole in the use process.

[0022] 4、The setting of the positioning piece and the elastic piece can relatively fix the sealing device and the inflating piston assembly, avoids the influence of the free movement of the sealing device on the normal use of the inflator in the use process, the setting of the movable cavity and the supporting block is favorable for the stable movement of the check valve, facilitates the sealing and disengagement of the check valve and the sealing port, and the setting of the supporting block can also avoid the sealing of the check valve to the inner cavity, and is convenient for a user to inflate through the inner cavity; the setting of the fixed groove is convenient for the positioning and installation of the supporting block, and in the structure, the supporting block is fixedly installed in the fixed groove through the threaded connection of the inner pipe and the second piston seat, and this is favorable for the assembly and production of the inflator.

[0023] 5、The setting of the third sealing ring is convenient for sealing the end part of the middle pipe, avoids the air in the outer cavity from entering the inner cavity through the guide hole, is convenient for a user to inflate through the inner cavity and the outer cavity respectively, is convenient for a user to use flexibly, the setting of the pressing block is convenient for the fixed installation of the third sealing ring and the assembly of the large piston; the setting of the clamping protrusion, the clamping groove and the guide surface is convenient for the quick fixed installation of the pressing block and the large piston, and is convenient for the production of the inflator. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a sectional view of the utility model;

[0025] Figure 2 is one of the local sectional views of the utility model;

[0026] Figure 3 is the second local sectional view of the utility model;

[0027] Figure 4 is the third local sectional view of the utility model;

[0028] Figure 5 is a structure schematic view of the handle in the utility model;

[0029] Figure 6 is a sectional view of the base in the utility model;

[0030] Figure 7 is a sectional view of the pipe, inner pipe and small piston connecting structure in the utility model;

[0031] Figure 8 is a sectional view of the outer pipe, middle pipe, inner pipe and large piston connecting structure in the utility model;

[0032] Figure 9 is an exploded schematic view of the small piston in the utility model;

[0033] Figure 10 is a sectional view of the second piston seat in the utility model;

[0034] Figure 11 is an exploded schematic view of the large piston in the utility model;

[0035] Figure 12 is a structural schematic view of the first piston seat in the utility model;

[0036] Figure 13 is a sectional view of the sealing plug in the utility model;

[0037] Figure 14 is a structural schematic view of the knob in the utility model.

[0038] The meaning of the reference numerals in the drawing: 1-base; 11-air flow channel; 12-second air hole; 13-first air hole;

[0039] 14-third air hole; 2-inflation nozzle; 3-air pipe; 31-outer pipe; 32-inner pipe; 33-small piston;

[0040] 34-supporting block; 311-outer cavity; 321-inner cavity; 331-sealing opening; 332-movable cavity; 333-second annular groove; 334-second air exchange groove; 335-second piston seat; 336-second sealing ring; 337-fixing groove; 341-through hole; 342-supporting protrusion; 4-inflation piston assembly; 41-grip; 42-middle pipe; 43-large piston;

[0041] 44-third sealing ring; 45-pressing block; 46-limiting pin; 411-hinge hole; 412-positioning groove; 413-limiting swing groove; 414-fixing hole; 421-sealing plug; 422-air inlet hole; 423-receiving groove;

[0042]

[0043] ​424- slope; 431- first piston seat; 432- first sealing ring; 433- guide hole; 434- mounting groove; 435- clamping groove; 436- guide surface; 437- first annular groove; 438- first air exchange groove; 451- clamping protrusion; 5- check valve; 6- sealing device; 61- sealing bead; 62- knob; 63- positioning piece; 64- elastic piece; 621- hinged rod; 622- limiting groove; 623- cam portion; 624- mounting hole; 625- control portion;

[0044] 626- limiting protrusion; 7- check valve. DETAILED DESCRIPTION

[0045] The utility model will be further described in conjunction with the specific embodiments of the drawings:

[0046] Referring to Figures 1 to 14 As shown in the figure, a pump, comprising base 1, base 1 detachably provided with air pipe 3, inflating piston assembly 4 and inflating nozzle 2, base 1 is provided with air flow channel 11 connecting air pipe 3 and inflating nozzle 2, the air pipe 3 includes inner tube 32 and outer tube 31 fixedly arranged on base 1 respectively, outer tube 31 is sleeved on the outer periphery of inner tube 32, inner tube 32 is provided with inner cavity 321 communicated with air flow channel 11, outer tube 31 and inner tube 32 form outer cavity 311 communicated with air flow channel 11, and one-way valve 5 is arranged between outer cavity 311 and air flow channel 11, inflating piston assembly 4 includes handle 41 and middle tube 42, middle tube 42 is arranged in outer tube 31 and is sleeved on the outer periphery of inner tube 32, middle tube 42 is provided with large piston 43, large piston 43 is arranged in outer cavity 311 and is sealingly connected with inner tube 32, air can enter outer cavity 311 through the gap between outer tube 31 and middle tube 42, and the air in outer cavity 311 is driven by large piston 43 to enter air flow channel 11 through one-way valve 5;

[0047] The middle tube 42 is provided with air inlet hole 422 communicated with the inner cavity 321 of the middle tube 42, the middle tube 42 is provided with sealing device 6 for sealing air inlet hole 422, the inner tube 32 is provided with small piston 33 and check valve 7, the inner cavity 321 is connected with sealing port 331, and the check valve 7 is arranged on one side of the sealing port 331;

[0048] Control air inlet hole 422 to be opened through sealing device 6, and control inflating piston assembly 4 to move forward, air can enter middle tube 42 through air inlet hole 422, and check valve 7 can seal sealing port 331; control inflating piston assembly 4 to move reversely, small piston 33 can extrude the air in inner cavity 321 and drive check valve 7 to move away from sealing port 331, so that the air in middle tube 42 enters air flow channel 11 through sealing port 331 and inner cavity 321.

[0049] The structure is provided with the inner cavity 321 and the outer cavity 311 in the inflator, air in the outer cavity 311 can enter the airflow channel 11 through the one-way valve 5, and air in the inner cavity 321 can directly enter the airflow channel 11, and the sealing device 6 can seal the inner cavity 321, so that air cannot enter or discharge from the inner cavity 321 through the air inlet hole 422.

[0050] The inflator is used as follows: when starting to inflate the tire or the ball, high pressure is not needed, at this time, the air inlet hole 422 is opened, air can directly enter the airflow channel 11 through the inner cavity 321 under the driving of the small piston 33, or air can enter the airflow channel 11 through the outer cavity 311 and the one-way valve 5 under the driving of the large piston 43, in this process, the air inflating amount is large, and rapid inflation can be carried out, when it is needed to increase the air pressure in the tire or the ball, the air inlet hole 422 is controlled to be sealed, air can only enter the airflow channel 11 through the outer cavity 311 and the one-way valve 5 under the driving of the large piston 43, in this process, it is beneficial to inflate high-pressure gas into the tire or the ball, and it is beneficial to increase the air pressure in the tire or the ball, the user can flexibly adjust the use of the inflator according to needs, and the flexible use of the inflator is facilitated.

[0051] The base 1 is provided with the first air hole 13 in communication with the inner cavity 321 and the second air hole 12 in communication with the outer cavity 311, the inner cavity 321 and the outer cavity 311 are respectively in communication with the airflow channel 11 through the first air hole 13 and the second air hole 12, the one-way valve 5 can seal the second air hole 12, and the base 1 is further provided with the third air hole 14 connecting the airflow channel 11 and the inflating nozzle 2.

[0052] The sealing device 6 comprises the sealing bead 61 and the knob 62 rotatably arranged on the inflating piston assembly 4, the cam portion 623 is arranged on the knob 62, the cam portion 623 can drive the sealing bead 61 to seal the air inlet hole 422 by rotating the knob 62, the knob 62 and the sealing bead 61 are arranged, so that the user can control the sealing and opening of the air inlet hole 422, the flexible use of the inflator is facilitated, and the cam portion 623 has a simple structure, so that the production and processing of the knob 62 are facilitated.

[0053] The knob 62 is provided with a control part 625 and a hinged rod 621 in the embodiment, the hinged rod 621 is matched with a hinged hole 411 provided on the inflation piston assembly 4, and a fixing hole 414 is provided on the inflation piston assembly 4, a limiting pin 46 is detachably arranged in the fixing hole 414, an annular or arc-shaped limiting groove 622 is arranged on the side wall of the hinged rod 621, the limiting pin 46 is arranged in the limiting groove 622 and limits the axial movement of the hinged rod 621 in the hinged hole 411, the arrangement of the hinged rod 621, the hinged hole 411, the limiting pin 46 and the limiting groove 622 facilitates the stable rotation of the knob 62, avoids the axial movement of the knob 62 affecting the connection and cooperation of the cam part 623 and the sealing bead 61 during use, and facilitates the user to control the sealing and opening of the air inlet hole 422.

[0054] Preferably, a limiting swing groove 413 is arranged on the inflation piston assembly 4, and a limiting protrusion 626 matched with the limiting swing groove 413 is arranged on the knob 62, the cooperation of the limiting swing groove 413 and the limiting protrusion 626 can limit the rotation range of the knob 62, and the limiting protrusion 626 is controlled to swing in the limiting swing groove 413, the cam part 623 can drive the sealing bead 61 to move and keep the hinged hole 411 in a sealed state and a connected state, the arrangement of the limiting swing groove 413 and the limiting protrusion 626 can limit the rotation angle of the knob 62, avoids the excessive rotation angle of the knob 62 affecting the sealing of the hinged hole 411 by the sealing bead 61, and facilitates the user to use.

[0055] The sealing plug 421 is fixedly arranged on the upper end of the middle tube 42, the air inlet hole 422 is arranged on the sealing plug 421, and a receiving groove 423 for mounting the sealing bead 61 is arranged on one side of the sealing plug 421, the cam part 623 is arranged on one side of the receiving groove 423 and avoids the sealing bead 61 from being separated from the receiving groove 423, the arrangement of the sealing plug 421 is beneficial to improve the sealing property of the middle tube 42, and the arrangement of the receiving groove 423 facilitates the stable movement of the sealing bead 61 and avoids the deflection and misplacement of the sealing bead 61 affecting the sealing of the air inlet hole 422 by the sealing bead 61 during use,

[0056] Preferably, the air inlet hole 422 is arranged at the bottom of the receiving groove 423, the sealing plug 421 is made of elastic material, a tapered inclined surface 424 is arranged at the upper end of the air inlet hole 422, the cam part 623 can drive the sealing bead 61 to abut against the inclined surface 424 and seal the air inlet hole 422, although the sealing bead 61 abuts against the tapered inclined surface 424 under the action of gravity in the description and the drawings, in the case of roughness of the inclined surface 424 and production error, air can still enter the inner cavity 321 through the air inlet hole 422.

[0057] The sealing device 6 is movably arranged on the inflating piston assembly 4, the sealing device 6 is provided with a positioning piece 63 and an elastic piece 64, the inflating piston assembly 4 is provided with two positioning grooves 412 matched with the positioning piece 63, the elastic piece 64 drives the positioning piece 63 to match with the two positioning grooves 412 respectively, so that the sealing device 6 is relatively fixed with the inflating piston assembly 4, and the hinged hole 411 is kept in a sealed state and a communication state; external force is applied on the sealing device 6, the positioning piece 63 can be separated from the positioning groove 412 and relatively move the sealing device 6 with the inflating piston assembly 4, the positioning piece 63 and the elastic piece 64 are arranged to relatively fix the sealing device 6 with the inflating piston assembly 4, so that the free movement of the sealing device 6 in the use process does not affect the normal use of the inflator.

[0058] The positioning groove 412 is arc-shaped in the embodiment, the positioning piece 63 is spherical, or the positioning piece 63 is provided with an arc-shaped end, the knob 62 is driven to rotate by external force, the positioning piece 63 can slide along the side wall of the positioning groove 412 and separate from the positioning groove 412, the mounting hole 624 is arranged on the side wall of the hinged rod 621, and the positioning piece 63 and the elastic piece 64 are arranged in the mounting hole 624.

[0059] The non-return valve 7 can be a one-way valve in the utility model, and the non-return valve 7 is a sealing sheet movably arranged in the movable cavity 332 in the embodiment.

[0060] The end of the inner tube 32 is provided with a supporting block 34, the movable cavity 332 is arranged on the small piston 33, the inner cavity 321 is communicated with the sealing port 331 through the movable cavity 332, the supporting block 34 can prevent the non-return valve 7 from separating from the movable cavity 332 and support the non-return valve 7, so that the non-return valve 7 seals the inner cavity 321, the movable cavity 332 and the supporting block 34 are arranged to facilitate the stable movement of the non-return valve 7, the sealing and separation of the non-return valve 7 and the sealing port 331, and the supporting block 34 can also prevent the non-return valve 7 from sealing the inner cavity 321, so that the user can inflate through the inner cavity 321.

[0061] The supporting block 34 is provided with a through hole 341 communicated with the inner cavity 321 in the embodiment, and a plurality of supporting protrusions 342 are arranged on the side, close to the non-return valve 7, of the supporting block 34, the supporting protrusions 342 can support the non-return valve 7 and prevent the non-return valve 7 from sealing the through hole 341.

[0062] The small piston 33 comprises a second piston seat 335, a movable cavity 332 is arranged in the second piston seat 335, and a fixing groove 337 for mounting the supporting block 34 is arranged on one side of the movable cavity 332; the inner tube 32 is threadedly connected with the second piston seat 335 and abuts the supporting block 34 in the fixing groove 337, and the fixing groove 337 facilitates the positioning and mounting of the supporting block 34, and the supporting block 34 is mounted in the fixing groove 337 through the thread connection between the inner tube 32 and the second piston seat 335, which facilitates the assembly and production of the inflator.

[0063] In the embodiment, a second annular groove 333 is arranged on the outer periphery of the second piston seat 335, a second sealing ring 336 is arranged in the second annular groove 333, and a second air exchange groove 334 is arranged on one side of the second annular groove 333; during the air suction process of the inflator, the second sealing ring 336 is close to the second air exchange groove 334, and the air on one side of the small piston 33 can enter the other side of the small piston 33 through the second air exchange groove 334 and the second annular groove 333.

[0064] The large piston 43 comprises a first piston seat 431, a guide hole 433 slidably connected with the inner tube 32 is arranged in the first piston seat 431, an installation groove 434 is arranged at one end of the guide hole 433, a third sealing ring 44 for sealing the gap between the guide hole 433 and the inner tube 32 is arranged in the installation groove 434, and a pressing block 45 is detachably arranged on the large piston 43 and abuts the third sealing ring 44 in the installation groove 434; the third sealing ring 44 facilitates the sealing of the end of the middle tube 42, avoids the air in the outer cavity 311 from entering the inner cavity 321 through the guide hole 433, facilitates the user to inflate through the inner cavity 321 and the outer cavity 311 respectively, facilitates the flexible use of the user, and the pressing block 45 facilitates the fixed mounting of the third sealing ring 44 and facilitates the assembly of the large piston 43.

[0065] In the embodiment, a first annular groove 437 is arranged on the outer periphery of the first piston seat 431, a first sealing ring 432 is arranged in the first annular groove 437, and a first air exchange groove 438 is arranged on one side of the first annular groove 437; during the air suction process of the inflator, the first sealing ring 432 is close to the first air exchange groove 438, and the air on one side of the large piston 43 can enter the other side of the large piston 43 through the first air exchange groove 438 and the first annular groove 437.

[0066] The pressing block 45 is provided with a plurality of clamping protrusions 451 on the outer periphery, a plurality of clamping grooves 435 matched with the clamping protrusions 451 are arranged on the side wall of the installation groove 434, and a guide surface 436 is arranged at the end of the installation groove 434; the clamping protrusions 451 are guided to enter the installation groove 434 through the guide surface 436 and matched with the clamping grooves 435, and the clamping protrusions 451, the clamping grooves 435 and the guide surface 436 facilitate the quick fixed mounting of the pressing block 45 and the large piston 43 and facilitate the production of the inflator.

[0067] The above embodiments are only preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A pump comprising a base (1) to which a hose (3), an inflator piston assembly (4) and an inflation valve (2) are detachably attached, the base (1) being provided with a flow channel (11) connecting the hose (3) and the inflation valve (2), characterized in that: The trachea (3) comprises an inner tube (32) and an outer tube (31), the inner tube (32) is provided with an inner cavity (321) communicated with the airflow channel (11), the outer tube (31) and the inner tube (32) form an outer cavity (311), and a one-way valve (5) is arranged between the outer cavity (311) and the airflow channel (11), the inflation piston assembly (4) comprises a handle (41) and a middle tube (42), the middle tube (42) is arranged in the outer tube (31) and is sleeved on the outer periphery of the inner tube (32), the middle tube (42) is provided with a large piston (43), the large piston (43) is arranged in the outer cavity (311) and is in sealing connection with the inner tube (32), and the large piston (43) can drive the air in the outer cavity (311) to enter the airflow channel (11) through the one-way valve (5). The middle tube (42) is provided with an air inlet hole (422) communicated with the outer environment and the inner cavity (321) of the middle tube (42), the inflation piston assembly (4) is provided with a sealing device (6) for sealing the air inlet hole (422), the inner tube (32) is provided with a small piston (33) and a check valve (7), and the inner cavity (321) is connected with a sealing port (331), and the check valve (7) is arranged on one side of the sealing port (331).

2. A pump as defined in claim 1, wherein: The sealing device (6) comprises a sealing bead (61) and a knob (62) rotatably arranged on the inflation piston assembly (4), the knob (62) is provided with a cam portion (623), and the cam portion (623) can drive the sealing bead (61) to seal the air inlet hole (422) by rotating the knob (62).

3. A pump as defined in claim 2, wherein: The knob (62) is provided with a hinged rod (621), the inflation piston assembly (4) is provided with a hinged hole (411) matched with the hinged rod (621), and a limiting pin (46) is detachably arranged on the inflation piston assembly (4), the hinged rod (621) is provided with an annular or arc-shaped limiting groove (622) on the side wall, and the limiting pin (46) is arranged in the limiting groove (622) and limits the axial movement of the hinged rod (621) in the hinged hole (411).

4. A pump according to claim 2 or 3, wherein: The inflation piston assembly (4) is provided with a limiting swing groove (413), the knob (62) is provided with a limiting protrusion (626) matched with the limiting swing groove (413), the limiting swing groove (413) and the limiting protrusion (626) cooperate to limit the rotation range of the knob (62), and the limiting protrusion (626) is controlled to swing in the limiting swing groove (413), the cam portion (623) drives the sealing bead (61) to move, and the hinged hole (411) remains in a sealed state and a connected state.

5. A pump as defined in claim 4, wherein: The middle tube (42) is fixedly provided with a sealing plug (421) sealing the upper end of the middle tube (42), the air inlet hole (422) is arranged on the sealing plug (421), and a receiving groove (423) for mounting the sealing bead (61) is arranged on one side of the sealing plug (421), and the cam portion (623) is arranged on one side of the receiving groove (423) and avoids the sealing bead (61) from separating from the receiving groove (423).

6. A pump as claimed in claim 1 or 2 or 3 or 5 wherein: The sealing device (6) is movably arranged in the inflating piston assembly (4), the sealing device (6) is provided with a positioning piece (63) and an elastic piece (64), the inflating piston assembly (4) is provided with two positioning grooves (412) matched with the positioning piece (63), the elastic piece (64) drives the positioning piece (63) to cooperate with the two positioning grooves (412) respectively, so that the sealing device (6) is relatively fixed with the inflating piston assembly (4), and the hinge hole (411) is kept in a sealed state and a communication state; external force acts on the sealing device (6), the positioning piece (63) can be separated from the positioning groove (412) and make the sealing device (6) relatively move with the inflating piston assembly (4).

7. A pump as claimed in claim 1 or 2 or 3 or 5 wherein: The end of the inner tube (32) is provided with a supporting block (34), the small piston (33) is provided with a movable cavity (332), the inner cavity (321) is communicated with the sealing port (331) through the movable cavity (332), and the check valve (7) is a sealing piece movably arranged in the movable cavity (332); the supporting block (34) can avoid the check valve (7) from separating from the movable cavity (332), and can support the check valve (7), so that the check valve (7) seals the inner cavity (321).

8. A pump as defined in claim 7, wherein: The small piston (33) comprises a second piston seat (335), the movable cavity (332) is arranged in the second piston seat (335), and one side of the movable cavity (332) is provided with a fixing groove (337) for mounting the supporting block (34); the inner tube (32) is threadedly connected with the second piston seat (335) and abuts the supporting block (34) in the fixing groove (337).

9. A pump as claimed in claim 1 or 2 or 3 or 5 or 8 wherein: The large piston (43) is provided with a guide hole (433) slidably connected with the inner tube (32), one end of the guide hole (433) is provided with a mounting groove (434), the mounting groove (434) is provided with a third sealing ring (44) for sealing the gap between the guide hole (433) and the inner tube (32), and the large piston (43) is detachably provided with a pressing block (45), the pressing block (45) abuts the third sealing ring (44) in the mounting groove (434).

10. A pump as defined in claim 9, wherein: The pressing block (45) is provided with a plurality of clamping protrusions (451) on the outer periphery, the side wall of the mounting groove (434) is provided with a plurality of clamping grooves (435) matched with the clamping protrusions (451), and the end of the mounting groove (434) is provided with a guide surface (436); the clamping protrusions (451) are guided into the mounting groove (434) through the guide surface (436) and matched with the clamping grooves (435).

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