A tire inflation device

Abstract

The present invention relates to the technical field of tire inflation, and particularly refers to a tire inflation device. It includes an inner tube and a sleeve sleeved outside the inner tube. The side wall of the sleeve is provided with a tire pressure gauge mounting hole and a pressure relief valve mounting hole; the inner side wall of the sleeve is thinned by 0.5 mm to 1 mm to form a widened part, and one end of the tire pressure gauge mounting hole and the pressure relief valve mounting hole located inside the sleeve is within the widened part; an air cavity is formed between the widened part and the outer wall of the inner tube, and a plurality of ventilation holes are opened on the wall of the inner tube, and the ventilation holes conduct between the inside of the inner tube and the air cavity; a plurality of grooves four are respectively opened on the inner sides of both ends of the sleeve, and sealing rings four are arranged in the grooves four. The tire pressure gauge can rotate around the axis of the tire pressure gauge mounting hole, and the control sleeve is sleeved outside the inner tube. The control sleeve can rotate around the axis of the inner tube. By rotating in two directions, the dial of the tire pressure gauge can be adjusted to any direction, so as to facilitate the operator to read the reading of the tire pressure gauge at any time.

Description

Technical Field

[0001] The present invention relates to the technical field of tire inflation, and particularly refers to a tire inflation device. Background Art

[0002] Whether in the period of rapid economic development or during the epidemic, truck transportation, as a major transportation mode, has played a huge role. In recent years, there have often been accidents where tires explode during inflation. When a tire explodes, it is extremely easy to cause casualties to nearby personnel or property losses. Moreover, the large tires used by most models of trucks are even larger in volume, and the power of the explosion will also increase accordingly. Therefore, existing tire inflation devices often are equipped with a tire pressure gauge to monitor the tire pressure during inflation to avoid casualties and property losses caused by tire explosions.

[0003] The existing technical solutions have the following disadvantages:

[0004] 1. The tire pressure gauge is fixed on the tire inflation device, or the tire pressure gauge can only rotate in a single direction, which is often inconvenient for the operator to observe the reading on the tire pressure gauge during use.

[0005] 2. The connection between the tire inflation device and the inflation rod is not convenient for installation and disassembly. When it is necessary to replace the inflation rod for different usage scenarios, the operation is rather cumbersome. If the operator does not operate carefully and the connection fails to meet the sealing requirements, air leakage will occur due to insufficient sealing at the connection.

[0006] 3. When the existing inflation joint is connected to the valve nozzle of the tire, without external force support, the connection between the inflation joint and the valve nozzle is not stable, and it is impossible to inflate the tire smoothly. If the operator holds the inflation rod and applies pressure to the inflation joint, the operator needs to be exposed in front of the tire, which has a great potential safety hazard. Summary of the Invention

[0007] The purpose of the present invention is to provide a tire inflation device with a simple structure, convenient operation, a tire pressure gauge that can turn in any direction, easy installation or removal of the inflation rod, and good sealing performance.

[0008] The purpose of the invention is achieved as follows:

[0009] A tire inflation device includes

[0010] An air pipe assembly for supplying air to the tire; an inflation rod is provided at the front end of the air pipe assembly, an inner pipe is provided at the rear of the air pipe assembly, and ventilation holes are provided on the surface of the inner pipe.

[0011] A sleeve, rotatably sleeved outside the inner tube; both ends of the sleeve and the inner tube are sealed, and an air chamber is formed between the sleeve and the inner tube; the vent hole communicates the air chamber and the pipeline inside the inner tube;

[0012] A pressure gauge and a pressure relief valve are arranged on the side wall of the sleeve; the inner ends of the pressure gauge and the pressure relief valve are respectively communicated with the air chamber.

[0013] Preferably, the inner wall thickness of the middle part of the sleeve is thinned by 0.5 mm to 1 mm to form a widened part, and the air chamber is formed between the widened part and the outer wall of the inner tube, and the inner ends of the pressure gauge and the pressure relief valve are located inside the air chamber.

[0014] Preferably, the pressure relief valve is inserted into the pressure relief valve mounting hole of the sleeve, and the bottom end of the pressure gauge is inserted into the pressure gauge mounting hole of the sleeve;

[0015] A second step portion is formed at one end of the pressure relief valve mounting hole located outside the sleeve.

[0016] Preferably, the pressure relief valve includes a second valve core and a second valve body. The second valve body is screwed into the pressure relief valve mounting hole, and the second valve core is inserted into the second valve body. The second valve core includes a pressing portion and a ventilation portion;

[0017] The curved surface of the ventilation portion is recessed inward to form a clamping groove, and a second sealing ring is arranged in the clamping groove.

[0018] Preferably, one end of the trachea assembly is connected with a quick-connect joint, and the quick-connect joint is used to connect an inflation rod;

[0019] The other end of the trachea assembly is connected with a control valve, and the control valve is used to control the airflow into the inner tube.

[0020] Preferably, the quick-connect joint includes

[0021] A housing, with a number of second through holes circumferentially arranged at its pipe orifice;

[0022] A one-way valve, inserted inside the housing and used to control the flow of gas in the housing;

[0023] Steel balls, arranged in the second through holes. The diameter of the steel balls is larger than the length of the second through holes, and the diameter of the steel balls is adapted to the pipe diameter of the second through holes, so that the steel balls can roll in the second through holes;

[0024] A control sleeve, sleeved outside the housing and capable of controlling the position of the steel balls in the second through holes.

[0025] Preferably, the one-way valve includes:

[0026] The valve core 1 is composed of a control piston and a docking part, a gas passage is provided inside the control piston, the inner side of the docking part is formed as a docking cavity, and the gas passage and the docking cavity are connected;

[0027] Valve body one, the outer diameter of the control piston is matched with the inner diameter of the valve body one, and the control piston penetrates into the valve body one;

[0028] A through hole 1 is formed on the tube wall of the control piston, and the through hole 1 is used to connect the gas passage and the interior of the housing;

[0029] The connection area between the control piston and the docking portion is formed as a step portion 1, and the outer diameter of the step portion 1 is the same as the outer diameter of the valve body 1.

[0030] Preferably, one end of the shell is a connecting portion, and the connecting portion is used to connect the shell to the inflatable rod;

[0031] The inner wall at the pipe opening of the shell body is convex inward to form a positioning portion, and the second through hole is arranged in the positioning portion;

[0032] A sliding portion is located between the connecting portion and the positioning portion, and the sliding portion is used for allowing the one-way valve to move in the housing.

[0033] Preferably, one end of the inflation rod is provided with an inflation rod air nozzle, and the other end is provided with a hollow inflation joint;

[0034] Connecting the inflation rod to the quick-connect joint via the inflation rod air nozzle;

[0035] A trapezoidal groove is arranged on the air nozzle of the inflation rod, and when the trapezoidal groove is aligned with the second through hole, the steel ball can enter the trapezoidal groove.

[0036] Preferably, the inflation joint is connected to the inflation rod via an inflation rod interface;

[0037] The inflation connector can be screwed onto the tire valve;

[0038] The outer wall of one end of the inflation rod interface inserted into the inflation rod is provided with a serration portion;

[0039] The other end of the inflation rod interface is connected to the inflation joint, and a mounting cavity is formed in the connection portion between the inflation rod interface and the inflation joint;

[0040] A core rod is inserted into the inflation joint;

[0041] The core rod comprises an air inlet end and an air outlet end, the air outlet end is inserted into the inflation joint, and the air inlet end is arranged in the installation cavity;

[0042] A through hole three is formed in the core rod. The through hole three near the pipe orifice of the inflation joint expands along the radial direction of the core rod and penetrates through both ends of the core rod.

[0043] The prominent and beneficial technical effects of the present invention compared with the prior art are as follows:

[0044] 1. The tire pressure gauge is sleeved on the control sleeve and can rotate around the axis of the tire pressure gauge mounting hole. The control sleeve is sleeved outside the inner tube and can rotate around the axis of the inner tube. By rotating in two directions, the dial of the tire pressure gauge can be adjusted to any direction, facilitating the operator to read the reading of the tire pressure gauge at any time.

[0045] 2. The present invention is provided with a control valve and a pressure relief valve. When the operator finds that the tire pressure is too high, the airflow to the tire can be blocked through the control valve, and then the tire pressure can be adjusted through the pressure relief valve.

[0046] 3. The inner tube is connected to the inflation rod through a quick-connect joint. When replacing the inflation rod, the installation and disassembly time of the inflation rod can be reduced while ensuring the sealing performance, improving the efficiency.

[0047] 4. When the quick-connect joint adopted by the present invention is separated from the inflation rod, the inflation rod nozzle of the inflation rod will be ejected from the quick-connect joint instead of remaining in the quick-connect joint, clearly showing the current connection relationship between the inflation rod and the quick-connect joint, thus playing a role in reminding the operator and avoiding air leakage caused by the loose connection between the inflation rod and the quick-connect joint.

[0048] 5. The present invention adopts an inflation joint that can be screwed onto the valve nozzle of the tire, thereby strengthening the fastening of the connection between the inflation joint and the valve nozzle. When the inflation joint is connected to the valve nozzle, the tire inflation device can independently inflate the tire, and the operator does not need to stay on-site, reducing the possibility of casualties in case of tire explosion. Connecting a rigid inflation rod to the inflation joint allows the operator to connect the inflation joint to the valve nozzle that is difficult to reach with the arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 is the structural diagram of the present invention.

[0050] Figure 2 is the exploded view of the present invention.

[0051] Figure 3 is the front view of the present invention when the inflation rod is not connected.

[0052] Figure 4 is Figure 3 the cross-sectional view taken along A-A in

[0053] Figure 5 is Figure 4 An enlarged view of A in

[0054] Figure 6 is an exploded view of the quick-connect joint and the inflatable rod nozzle of the present invention.

[0055] Figure 7 is Figure 4 A partial sectional view of with B-B as the dividing line.

[0056] Figure 8 is Figure 7 A sectional view of with C-C as the section.

[0057] Figure 9 is Figure 8 A sectional view of the housing of with D-D as the section.

[0058] Figure 10 is Figure 7 An enlarged view of B in

[0059] Figure 11 is Figure 8 A sectional view of the quick-connect joint and the inflatable rod nozzle when connected with D-D as the section.

[0060] Figure 12 is the structural diagram of the second embodiment of the present invention.

[0061] Figure 13 is the structural diagram of the third embodiment of the present invention.

[0062] Figure 14 is the top view of the inflatable joint of the present invention.

[0063] Figure 15 is the sectional view of the inflatable joint of the present invention.

[0064] Reference numerals: 1 - trachea assembly; 11 - inner tube; 12 - ventilation hole;

[0065] 2 - sleeve; 21 - pressure relief valve installation hole; 22 - tire pressure gauge installation hole; 23 - second step portion; 24 - widened portion; 25 - air cavity; 26 - fourth groove; 27 - fourth sealing ring; 28 - friction portion;

[0066] 3 - quick-connect joint; 31 - housing; 311 - connecting portion; 312 - positioning portion; 3121 - limiting portion; 3122 - first inclined surface; 3123 - second inclined surface; 313 - sliding portion; 314 - clamping portion; 315 - second groove; 316 - third step portion; 32 - control sleeve; 33 - connecting pipe; 34 - third spring; 35 - snap ring; 36 - protruding portion; 37 - pushing inclined surface; 38 - second through hole; 39 - steel ball;

[0067] 4 - One - way valve; 43 - Spring 1; 44 - Sealing washer; 441 - Convex edge;

[0068] 41 - Valve core 1; 411 - Control piston; 4111 - Gas passage; 4112 - Through - hole 1; 4113 - Groove 5; 4114 - Sealing ring 5; 412 - Docking part; 4121 - Positioning inclined plane 1; 413 - Docking cavity; 4131 - Positioning inclined plane 2; 4132 - Embedded groove; 414 - Step part 1;

[0069] 42 - Valve body 1; 421 - Baffle; 422 - Groove 1; 423 - Sealing ring 1;

[0070] 5 - Inflating rod nozzle; 51 - Insertion part; 52 - Positioning convex part; 53 - Trapezoidal groove; 54 - Inclined plane 3;

[0071] 6 - Control valve; 61 - Valve pipe; 62 - Ball valve; 63 - Valve switch;

[0072] 7 - Pressure - relief valve; 71 - Valve core 2; 711 - Pressing part; 712 - Ventilation part; 713 - Connecting rod; 714 - Card slot; 715 - Sealing ring 2; 72 - Valve body 2; 721 - Groove 3; 722 - Sealing ring 3; 723 - Positioning inclined plane 3; 73 - Spring 2;

[0073] 8 - Tire pressure gauge;

[0074] 9 - Inflating rod; 91 - Inflating joint; 92 - Inflating rod interface; 93 - Core rod; 931 - Intake end; 932 - Outlet end; 94 - Through - hole 3; 95 - Serrated part; 96 - Installation cavity; 97 - Double - head inflating rod; 98 - Straight - type inflating rod; 99 - Rubber inflating rod. Detailed implementation mode

[0075] The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0076] Embodiment 1:

[0077] As Figures 1 - 5 shown, a tire inflating device includes a tracheal component 1 for supplying air to the tire. An inflating rod 9 is arranged at the front end of the tracheal component 1, an inner tube 11 is arranged at the rear part of the tracheal component 1, and ventilation holes 12 are arranged on the surface of the inner tube 11;

[0078] A sleeve 2 which is rotatably sleeved outside an inner tube 11; both ends of the sleeve 2 and the inner tube 11 are sealed, and an air cavity 25 is formed between the sleeve 2 and the inner tube 11; the vent hole 12 communicates the air cavity 25 and the pipeline inside the inner tube 11. The sleeve 2 can be made of an elastic material such as rubber. At the same time, the friction provided by the material also facilitates the operator to rotate the sleeve 2 and improves the comfort of the operator when grasping.

[0079] A tire pressure gauge mounting hole 22 and a pressure relief valve mounting hole 21 are formed in the side wall of the sleeve 2. The inner end of the tire pressure gauge 8 can be placed into the tire pressure gauge mounting hole 22, and the inner end of the pressure relief valve 7 can be placed into the pressure relief valve mounting hole 21. An interference fit exists between the tire pressure gauge 8 and the tire pressure gauge mounting hole 22 and between the pressure relief valve 7 and the pressure relief valve mounting hole 21. The inner ends of the tire pressure gauge 8 and the pressure relief valve 7 are respectively communicated with the air cavity 25.

[0080] When the tire pressure gauge 8 is placed into the tire pressure gauge mounting hole 22 or the pressure relief valve 7 is placed into the pressure relief valve mounting hole 21, the elastic sleeve 2 will be squeezed and contracted. After the tire pressure gauge 8 and the pressure relief valve 7 are assembled, the sleeve 2 is no longer stressed, and the elastic force accumulated inside it is released, so that the tire pressure gauge mounting hole 22 or the pressure relief valve mounting hole 21 tightly wraps the part of the tire pressure gauge 8 or the pressure relief valve 7 inserted into the sleeve 2, thereby providing a certain frictional force to fix the tire pressure gauge 8 and the pressure relief valve 7. The opening depth of the tire pressure gauge mounting hole 22 and the pressure relief valve mounting hole 21 is 12 mm, and the part of the tire pressure gauge 8 and the pressure relief valve 7 inserted into the sleeve 2 does not exceed 12 mm.

[0081] A rotational connection exists between the tire pressure gauge 8 and the part of it inserted into the sleeve 2. After the tire pressure gauge 8 is assembled into the tire pressure gauge mounting hole 22, the tire pressure gauge 8 can still rotate. The sleeve 2 can rotate outside the inner tube 11. Through the rotation between the tire pressure gauge 8 and the sleeve 2 and the rotation between the sleeve 2 and the inner tube 11, the tire pressure gauge 8 can rotate in two different planes, so that the tire pressure gauge 8 is more flexible, and the dial of the tire pressure gauge 8 can be aligned in any direction, facilitating the operator to view the numbers on the dial of the tire pressure gauge 8 in different environments.

[0082] As Figure 4 and Figure 5 shown, the tube wall in the middle of the sleeve 2 is thinned by 0.5 mm to 1 mm to form a widened part 24. The range of the widened part 24 should at least include the axial positions where the tire pressure gauge mounting hole 22 and the pressure relief valve mounting hole 21 are located, so as to ensure that the inner ends of the tire pressure gauge 8 and the pressure relief valve 7 are located inside the air cavity 25.

[0083] After the sleeve 2 is sleeved outside the inner tube 11, an air cavity 25 is formed between the widened portion 24 and the outer wall of the inner tube 11. Since the ends of the pressure gauge mounting hole 22 and the pressure relief valve mounting hole 21 located inside the sleeve 2 are within the widened portion 24, the ends of the pressure gauge mounting hole 22 and the pressure relief valve mounting hole 21 located inside the sleeve 2 are also within the air cavity 25. In this embodiment, a total of four vent holes 12 are formed in the tube wall of the inner tube 11. Every two oppositely arranged vent holes 12 form a group, and each group of vent holes 12 respectively corresponds to the position where the pressure gauge mounting hole 22 or the pressure relief valve mounting hole 21 is located. When the sleeve 2 rotates outside the inner tube 11, it can ensure that the gas in the inner tube 11 is more evenly distributed in the air cavity 25.

[0084] When the inner tube 11 is filled with gas, the gas will fill the air cavity 25 through the vent holes 12. Since the parts of the pressure gauge 8 and the pressure relief valve 7 inserted into the sleeve 2 do not exceed the opening depths of the pressure gauge mounting hole 22 and the pressure relief valve mounting hole 21, when the sleeve 2 rotates, the pressure gauge 8 and the pressure relief valve 7 will not collide with the inner tube 11, and the air flow can still enter the air cavity 25 through the vent holes 12. The interior of the inner tube 11 is in communication with the air cavity 25, and the pressure gauge 8 can know the pressure inside the inner tube 11 by measuring the pressure in the air cavity 25. When the pressure relief valve 7 discharges the gas in the air cavity 25, due to the decrease in the air pressure in the air cavity 25, the gas in the inner tube 11 will enter the air cavity 25 for replenishment, so that the pressure relief valve 7 can discharge the gas in the inner tube 11 to achieve the function of pressure relief. By providing the air cavity 25 - vent holes 12, it can be ensured that when the inner tube 11 and the sleeve 2 rotate relative to each other, the normal operation of the pressure relief valve 7 and the pressure gauge 8 will not be affected. When the inner tube 11 and the sleeve 2 rotate relative to each other, the ports of the vent holes 12 located outside the inner tube 11 also rotate inside the air cavity 25, so that the gas is more evenly distributed in the air cavity 25.

[0085] In this embodiment, two grooves four 26 are respectively formed on the inner sides of both ends of the sleeve 2, and sealing rings four 27 are arranged in the grooves four 26. Since it is convenient for the sleeve 2 to be sleeved outside the inner tube 11, the inner diameter of the sleeve 2 is slightly larger than the outer diameter of the inner tube 11, and there is a tiny gap between the sleeve 2 and the inner tube 11. Two sealing rings four 27 are arranged on each side to form two layers of seals, which can better ensure the airtightness between the sleeve 2 and the inner tube 11 and maintain the air pressure in the air cavity 25.

[0086] The inner diameter of one end of the sleeve 2 is reduced to form a friction portion 28, and the inner diameter of the friction portion 28 is adapted to the outer diameter of the inner tube 11. In this embodiment, the sleeve 2 is made of rubber. When the inner diameter of one end of the sleeve 2 is reduced to be the same as the outer diameter of the inner tube 11, a frictional force will be generated when there is a relative displacement between the sleeve 2 and the inner tube 11. By means of the frictional force generated when the sleeve 2 and the inner tube 11 are in contact, the sleeve 2 is not easily displaced in the static state, thereby fixing the position of the sleeve 2 on the inner tube 11, keeping the air cavity 25 and the vent hole 12 aligned, and maintaining the air pressure in the air cavity 25.

[0087] Only a friction portion 28 is provided at one end of the sleeve 2, which is convenient for sleeving the other end of the sleeve 2 to the outside of the inner tube 11 during assembly.

[0088] As Figures 2 - 5 shown, the pressure relief valve 7 is inserted through the pressure relief valve mounting hole 21, and the bottom end of the tire pressure gauge 8 is inserted through the tire pressure gauge mounting hole 22.

[0089] A second step portion 23 is formed at one end of the pressure relief valve mounting hole 21 located outside the sleeve 2. The depth of the second step portion 23 is 1 mm. The outer diameter of the pressure relief valve 7 is slightly larger than the inner diameter of the pressure relief valve mounting hole 21. The provision of the second step portion 23 allows the sleeve 2 to have a space for deformation when being squeezed by the pressure relief valve 7, facilitating the insertion of the pressure relief valve 7 into the pressure relief valve mounting hole 21. The top end of the valve body 72 of the pressure relief valve 7 can also be in contact with the second step portion 23, and by squeezing, the sleeve 2 is deformed, so that the sleeve 2 fits on the valve body 72, realizing the sealing function.

[0090] A groove 721 is provided on the outer side of the valve body 72 of the pressure relief valve 7, and a third sealing ring 722 is provided in the groove 721. Since the outer diameter of the part of the groove 721 is smaller than the outer diameter of the bottom end of the valve body 72, when the third sealing ring 722 is arranged in the groove 721, the contact area between the third sealing ring 722 and the pressure relief valve mounting hole 21 can be reduced, and the frictional force can be reduced, facilitating the insertion of the pressure relief valve 7 into the pressure relief valve mounting hole 21. And the outer diameter of the top end of the valve body 72 is slightly smaller than the outer diameter of the third sealing ring 722 sleeved on the outside of the groove 721, so that the third sealing ring 722 can be pushed and the third sealing ring 722 is not easily disengaged from the groove 721. After the pressure relief valve 7 is assembled, the third sealing ring 722 is closely attached to the inner wall of the pressure relief valve mounting hole 21 to form a seal.

[0091] As Figure 4 and Figure 5As shown, the pressure relief valve 7 includes a second spool 71 and a second valve body 72. The second valve body 72 is screwed into the pressure relief valve mounting hole 21. In this way, it can ensure that the inner wall of the sleeve 2 and the outer wall of the second valve body 72 are closely fitted together, thereby providing a good sealing effect, avoiding air leakage, and facilitating the installation of the pressure relief valve 7. The second spool 71 is inserted through the second valve body 72. The second spool 71 includes a pressing portion 711 and a venting portion 712. The inner diameter of the lower side of the second valve body 72 is slightly larger than the outer diameter of the venting portion 712 and smaller than the diameter of the pressing portion 711, so that the venting portion 712 can pass through the second valve body 72, while the pressing portion 711 cannot pass through the second valve body 72.

[0092] The region where the inner diameter of the second valve body 72 changes is formed into a third positioning inclined surface 723. When assembling the pressure relief valve 7, the third positioning inclined surface 723 facilitates the passage of the venting portion 712 of the second spool 71 through the second valve body 72, optimizing the assembly process. During use, the pressing portion 711 is restricted by the third positioning inclined surface 723 and cannot pass through the second valve body 72. Between the pressing portion 711 and the venting portion 712 is a cylindrical connecting rod 713. A second spring 73 is sleeved outside the connecting rod 713. One end of the second spring 73 abuts against the bottom surface of the pressing portion 711 of the second spool 71, and the other end abuts against the third positioning inclined surface 723. The second spring 73 is used to reset the second spool 71 to ensure that the pressure relief valve 7 is in a closed state when static.

[0093] The shape of the pressing portion 711 is a stepped coaxial cylinder. The diameter of the larger end of the pressing portion 711 is larger than the inner diameter of the upper end of the second valve body 72, and the diameter of the smaller end of the pressing portion 711 is slightly smaller than the inner diameter of the upper end of the second valve body 72, so that a small gap is formed between the pressing portion 711 and the inner wall of the upper end of the second valve body 72. During use, by pressing the pressing portion 711, the second spring 73 can be contracted to open the pressure relief valve 7.

[0094] The diameter of the venting portion 712 is slightly smaller than the inner diameter of the lower end of the second valve body 72, so that a small gap is formed between the venting portion 712 and the inner wall of the lower end of the second valve body 72. The curved surface of the venting portion 712 is recessed inward to form a clamping groove 714. A second sealing ring 715 is arranged in the clamping groove 714. The second sealing ring 715 is used to block the small gap formed between the venting portion 712 and the inner wall of the lower end of the second valve body 72. The second sealing ring 715 is fixed in the clamping groove 714 and moves together with the second spool 71.

[0095] When the pressing portion 711 is pressed, the second spool 71 moves, and the second sealing ring 715 fixed thereto also moves, thus no longer blocking the gap between the venting portion 712 and the second valve body 72. At this time, the air flow can flow out through the gap between the venting portion 712 and the second valve body 72, realizing the function of pressure relief.

[0096] When the pressing part 711 is released, the second spring 73 pushes the pressing part 711 to reset the second spool 71. Since the cross-section of the ventilation part 712 is in the shape of a "work" character, the bottom end of the ventilation part 712 drives the second sealing ring 715 to move in turn until the second sealing ring 715 abuts against the bottom end of the second valve body 72. Since the outer diameter of the second sealing ring 715 is much larger than the inner diameter of the opening at the bottom end of the second valve body 72, it cannot pass through. The force transmitted from the ventilation part 712 causes the second sealing ring 715 to deform until the small gap formed between the second sealing ring 715 for sealing the inner walls of the ventilation part 712 and the lower end of the second valve body 72 is completely blocked.

[0097] The pressing part 711 located above the second valve body 72 cannot pass through the second valve body 72. After the ventilation part 712 passes through the second valve body 72 and is sleeved with the second sealing ring 715, it also cannot pass through the second valve body 72 from the lower side of the second valve body 72, thus restricting the second spool 71 and limiting the second spool 71 inside the second valve body 72. This maintains the stability of the pressure relief valve 7 and increases the durability of the product.

[0098] Combined with Figures 2 - 3 - Figure 4 and Figure 6 As shown in the figure, one end of the inner tube 11 is connected with a quick-connect fitting 3, and the quick-connect fitting 3 is used to connect the inflation rod 9, and gas is sent into the inflation rod 9 through the quick-connect fitting 3.

[0099] The other end of the inner tube 11 is connected with a control valve 6, and the control valve 6 is used to control the airflow into the inner tube 11. In this embodiment, the control valve 6 is a ball valve 62, and the ball valve 62 is arranged in the valve tube 61 and is connected to the inner tube 11 through the valve tube 61. The valve tube 61 and the quick-connect fitting 3 cannot be arranged on the same side of the inner tube 11.

[0100] The operator can check the inflation condition of the tire according to the display count of the tire pressure gauge 8 and judge whether the tire needs to be depressurized. If the tire pressure is too high, the ball valve 62 is controlled to close through the valve switch 63, so as to stop the gas supply of the tire inflation device, and then the excess gas in the tire inflation device is discharged through the pressure relief valve 7.

[0101] The ball valve 62 adopted in this embodiment is one of the optional structures of the control valve 6, and does not limit the structure of the control valve 6 here. Here, it is only an example to illustrate the function of the control valve 6. In other embodiments, the control valve 6 can select other valve structures that can play the same role.

[0102] Such as Figures 2 - 11 As shown in the figure, in this embodiment, the quick-connect fitting 3 includes a housing 31 and a check valve 4, and the check valve 4 is arranged inside the housing 31.

[0103] A housing 31 is provided with six second through holes 38 at the nozzle of the housing 31. The second through holes 38 are arranged circumferentially at the nozzle of the housing 31, and the angular interval between two adjacent second through holes 38 is 60 degrees.

[0104] A one-way valve 4 is arranged inside the housing 31 and is used to control the flow of gas in the housing 31. When the inflation rod nozzle 5 is inserted into the housing 31, the one-way valve 4 opens, so that the interior of the housing 31 is communicated with the inflation rod nozzle 5, and the air flow enters the inflation tube through the quick connector 3.

[0105] A steel ball 39 is arranged in the second through hole 38. The diameter of the steel ball 39 is larger than the length of the second through hole 38, and the diameter of the steel ball 39 is adapted to the inner diameter of the second through hole 38, so that the steel ball 39 can roll in the second through hole 38. When the inflation rod nozzle 5 is connected to the housing 31, the steel ball 39 is placed in the trapezoidal groove 53, so that a clamping connection is formed between the housing 31 and the inflation rod nozzle 5, thereby fixing the inflation rod nozzle 5 and the housing 31.

[0106] A control sleeve 32 is sleeved outside the housing 31 and can control the position of the steel ball 39 in the second through hole 38. By changing the position of the steel ball 39 in the second through hole 38, the connection between the inflation rod nozzle 5 and the housing 31 can be controlled.

[0107] An adapter tube 33 is further arranged between the inner tube 11 and the quick connector 3. The inner tube 11 is connected to the quick connector 3 through the adapter tube 33. By replacing the adapted adapter tube 33, the quick connector 3 can be connected to various different types of inner tubes 11, increasing the applicability of the quick connector 3. Users do not need to purchase corresponding specifications of inner tubes 11 to use the quick connector 3, improving the comfort of users.

[0108] As Figures 6 - 11 shown,

[0109] A first valve core 41 is composed of a control piston 411 and a docking part 412. The control piston 411 is the end with a smaller outer diameter on the first valve core 41, and the docking part 412 is the end with a larger outer diameter on the first valve core 41. A gas channel 4111 is formed inside the control piston 411, and a docking cavity 413 is formed inside the docking part 412. The docking cavity 413 is used to dock with the inflation rod nozzle 5, and the gas channel 4111 is communicated with the docking cavity 413.

[0110] A first valve body 42 is adapted to the outer diameter of the control piston 411 and the inner diameter of the first valve body 42, so that the control piston 411 can pass through the first valve body 42 and can move in the axial direction.

[0111] A through hole 4112 is provided on the pipe wall where the control piston 411 extends into the first valve body 42. When the first valve body 42 covers the pipe wall provided with the through hole 4112, the one-way valve 4 is in a closed state. At this time, the through hole 4112 is located inside the first valve body 42, and the inner wall of the first valve body 42 fits on the surface of the control piston 411, thereby playing a role in blocking the through hole 4112 and separating the space inside the one-way valve 4 from the space inside the housing 31.

[0112] Two grooves 4113 are formed on the outer wall of the control piston 411. The grooves 4113 are distributed on both sides of the through hole 4112 along the axial direction of the control piston 411, and sealing rings 4114 are arranged in the grooves 4113. The distance between the grooves 4113 is less than the length of the first valve body 42. When the control piston 411 extends into the first valve body 42, the first valve body 42 can cover the areas where the through hole 4112 and the sealing rings 4114 are located at the same time, making the sealing rings 4114 fit on the inner wall of the first valve body 42, forming seals on both sides of the through hole 4112 and blocking the air flow between the housing 31 and the gas passage 4111. At this time, the one-way valve 4 is in a closed state.

[0113] The connection area between the control piston 411 and the docking part 412 is formed into a first stepped part 414, and the outer diameter of the first stepped part 414 is the same as the outer diameter of the first valve body 42. Since a docking cavity 413 is formed inside the docking part 412, the wall thickness at the connection between the docking part 412 and the control piston 411 is relatively thin. The setting of the first stepped part 414 helps to improve the problem of the relatively thin wall thickness at the connection between the docking part 412 and the control piston 411, enhance the structural strength at the connection between the control piston 411 and the docking part 412, and prevent breakage between the docking part 412 and the control piston 411.

[0114] The inner diameter of the docking part 412 is slightly larger than the outer diameter of the insertion part 51 of the inflation rod nozzle 5, facilitating the insertion of the insertion part 51 into the docking part 412. An embedding groove 4132 is formed in the docking cavity 413, and a sealing gasket 44 is embedded in the embedding groove 4132. A convex edge 441 is formed by the raised edge of the hole in the middle of the sealing gasket 44, and the cross-section of the convex edge 441 is triangular.

[0115] A second positioning inclined surface 4131 is formed at the opening of the docking cavity 413, making the inner diameter of the docking cavity 413 gradually increase towards the pipe orifice direction, and the opening of the docking cavity 413 expands into a flared shape.

[0116] When the flared docking cavity 413 is connected to the inflation rod nozzle 5, it is sealed by the press-fit inclined side inner sealing method, avoiding the contact of the pipe end face with the fluid, thereby reducing the problem of end face corrosion and damage to the multi-layer structure of the pipe.

[0117] The flared docking cavity 413 is convenient and quick to install, easy to operate, and the connection can be disassembled and reassembled repeatedly. After the connection is completed, the medium can be transported without waiting for curing or cooling, which is extremely convenient for pipeline decoration - modification - update. The installation performance is reliable, the sealing performance is good, and there is no need to consider anti-slip measures for the pipe interface, reducing the assembly difficulty.

[0118] When the inflating rod nozzle 5 is connected to the quick connector 3, the second positioning inclined plane 4131 guides the inflating rod nozzle 5. The flared opening makes it easier for the insertion part 51 to enter the docking cavity 413. When the insertion part 51 contacts the second positioning inclined plane 4131, it will be pushed by the inclined plane towards the center of the docking cavity 413.

[0119] At the same time, the inclination angle of the second positioning inclined plane 4131 is the same as the inclination angle of the third inclined plane 54 of the inflating rod nozzle 5. After the inflating rod nozzle 5 is placed in the docking cavity 413, the inflating rod nozzle 5 will push the first valve core 41. The second positioning inclined plane 4131 fits with the third inclined plane 54, which can effectively reduce the pressure between the first valve core 41 and the inflating rod nozzle 5, thus avoiding damage to the first valve core 41 due to excessive local pressure and extending the service life of the product.

[0120] A baffle 421 is arranged on the outer side of the first valve body 42, and the first valve body 42 is fixed inside the housing 31 through the baffle 421.

[0121] A first spring 43 is arranged outside the control piston 411. One end of the first spring 43 abuts against the docking part 412, and the other end of the first spring 43 abuts against the end face of the baffle 421 facing the docking part 412. Since the outer diameter of the first step part 414 is the same as the outer diameter of the first valve body 42, the first step part 414 can also play a role in positioning the position of the first spring 43, so that one end of the first spring 43 abutting against the docking part 412 will not move easily, thus keeping the first spring 43 in a compressed or expanded state along the axial direction.

[0122] When the inflating rod nozzle 5 is connected to the housing 31 of the quick connector 3, the inflating rod nozzle 5 pushes the first valve core 41. Due to the steel ball 39, a clamping connection is formed between the housing 31 and the inflating rod nozzle 5, and the first spring 43 will maintain the state of accumulating elastic potential energy. When it is necessary to pull out the inflating rod nozzle 5, the housing 31 and the inflating rod nozzle 5 are no longer clamped and fixed to each other. The first spring 43 will push the docking part 412, drive the first valve core 41 to reset, and transfer a part of the energy to the inflating rod nozzle 5 at the same time. Due to inertia, the inflating rod nozzle 5 will pop out from the quick connector 3.

[0123] Only when the inflation rod nozzle 5 and the quick-connect joint 3 are mutually clamped by the steel ball 39, the first spring 43 will not push the inflation rod nozzle 5. Therefore, the inflation rod nozzle 5 will not be ejected from the housing 31. Through this design, it is possible to remind the operator in a visually and tactilely obvious way, clearly indicating the connection state between the inflation rod nozzle 5 and the quick-connect joint 3, thereby reducing the occurrence of air leakage caused by loose connection.

[0124] A first groove 422 is formed in the first valve body 42. The first groove 422 is close to the end face of the baffle 421 on the side where the first spring 43 is not provided. A first sealing ring 423 is arranged in the first groove 422. Since the baffle 421 is close to the connection part of the housing 31 and the connecting pipe 33, it is necessary to arrange the first sealing ring 423 for sealing. The first groove 422 serves to fix the position of the first sealing ring 423. When the connecting pipe 33 is connected to the housing 31, the internal space is not sufficient to accommodate the first sealing ring 423, and the first groove 422 can be used to accommodate the first sealing ring 423. When the first sealing ring 423 is squeezed by the connecting pipe 33, the baffle 421 can support the first sealing ring 423 without displacement, so that the squeezed first sealing ring 423 fits on the edge of the connecting pipe 33 to achieve the sealing effect.

[0125] As Figures 7 - 11 shown, one end of the housing 31 is a connecting part 311, and the connecting part 311 is used for connecting the housing 31 to the inflation rod 9. In this embodiment, the connecting part 311 of the housing 31 and the connecting pipe 33 are integrally connected by screwing.

[0126] The inner wall at the pipe orifice of the housing 31 bulges inward to form a positioning part 312, and the second through hole 38 is arranged in the positioning part 312.

[0127] A sliding part 313, which is located between the connecting part 311 and the positioning part 312. The inner diameter of the sliding part 313 is adapted to the outer diameter of the outside of the docking part 412. The sliding part 313 is used for the one-way valve 4 to move within the housing 31.

[0128] After the one-way valve 4 is assembled, the limiting part 3121 formed on the positioning part 312 serves to limit the movement of the one-way valve 4. The sliding part 313 is used to move the valve core 41 of the one-way valve 4. The transition area between the positioning part 312 and the sliding part 313 is formed as an inclined surface 3122. When the one-way valve 4 is assembled into the interior of the housing 31, the inclined surface 3122 guides the direction of the valve core 41, facilitating the accurate installation of the valve core 41.

[0129] The outer diameter of the docking cavity 413 is adapted to the inner diameter of the positioning portion 312. The docking cavity 413 abuts against the limiting portion 3121. A first positioning inclined surface 4121 is provided on the outer side of the docking portion 412, and the inclination angle of the first positioning inclined surface 4121 is smaller than the inclination angle of the first inclined surface 3122, so that the first inclined surface 3122 can hold the first valve core 41, thereby fixing the position of the one-way valve 4.

[0130] The transition region between the connecting portion 311 and the sliding portion 313 is formed into a second inclined surface 3123. The edge of the baffle 421 abuts against the second inclined surface 3123. After the connecting pipe 33 is connected to the housing 31, the baffle 421 is clamped between the second inclined surface 3123 and the connecting pipe 33, thereby fixing the first valve body 42 through the baffle 421.

[0131] A control sleeve 32 is sleeved outside the housing 31. A convex portion 36 is provided on the inner side of the control sleeve 32. A third step portion 316 is also formed on the outside of the housing 31. The third step portion 316 is located inside the control sleeve 32. A third spring 34 is provided between the third step portion 316 and the convex portion 36.

[0132] A clamping portion 314 is provided inside the positioning portion 312. The housing 31 is provided with a second groove 315 for arranging a snap ring 35. The connection state between the quick-connect joint 3 and the inflation rod nozzle 5 can be controlled through the control sleeve 32.

[0133] Combined Figures 7 - 8 - Figure 9 and Figure 11 As shown in FIGS.

[0134] An inflation rod nozzle 5 for connecting with the air pipe assembly 1 is provided on the inflation rod 9. The other end of the inflation rod 9 is provided with a hollow inflation joint 91. The inflation joint 91 is used for connecting with a tire valve to ensure that the gas in the inflation rod 9 smoothly enters the tire. A positioning convex portion 52 is provided on the inflation rod nozzle 5. A trapezoidal groove 53 is formed inside the positioning convex portion 52. The width of the top end of the trapezoidal groove 53 is greater than the diameter of the second through hole 38. The depth of the trapezoidal groove 53 is not less than the radius length of the steel ball 39. The transition region between the positioning convex portion 52 and the insertion portion 51 is formed into a third inclined surface 54.

[0135] When the quick connector 3 is in an unconnected state, the top of the docking portion 412 abuts against the limiting portion 3121, and the docking portion 412 blocks the port of the second through hole 38 toward the inside of the housing 31. At this time, due to the insufficient space inside the second through hole 38, the control sleeve 32 needs to be pulled down to move the steel ball 39 to the outside of the housing 31 and be blocked by the inner wall of the top of the control sleeve 32. The bottom end of the protrusion 36 is pushed by the spring 34, so that the push slope 37 at the upper end of the protrusion 36 abuts against the lower end of the steel ball 39, and the upper end of the steel ball 39 abuts against the upper inner wall of the second through hole 38, thereby forming a stable structure.

[0136] When the quick-connect connector 3 is connected to the inflation rod nozzle 5, the inflation rod nozzle 5 pushes the valve core 1 41, so that the docking portion 412 no longer blocks the port of the through hole 2 38 toward the inside of the housing 31. As the inflation rod nozzle 5 is extended, the positioning protrusion 52 is aligned with the through hole 2 38. At this time, the push slope 37 at the upper end of the step portion 316 can decompose the vertical force applied by the spring 34 to the protrusion 36 into a horizontal force component, thereby pushing the steel ball 39 to move to the inside of the housing 31. As the protrusion 36 rises, the push slope 37 pushes the steel ball 39 into the trapezoidal groove 53, and the protrusion 36 blocks the side of the through hole 2 38 leading to the control sleeve 32, so that the steel ball 39 cannot be completely separated from the trapezoidal groove 53, so that the inflation rod nozzle 5 and the docking cavity 413 are fixed.

[0137] like Figure 2 As shown, the inflation rod nozzle 5 is screwed on the inflation rod 9, and the inflation rod 9 is connected to the quick-connect joint 3 through the inflation rod nozzle 5. The inflation rod 9 in this embodiment is a double-headed inflation rod 97. By changing the position of the clamp on the double-headed inflation rod 97, the valves at different positions of the tire can be connected, and the application occasions are wide. The quick-connect clamp on the double-headed inflation rod 97 can more firmly connect the valve of the tire while ensuring air tightness, so that the operator no longer needs to hold the inflation device to fix it during the inflation process, and the personal safety of the operator can also be guaranteed.

[0138] Embodiment 2:

[0139] like Figure 12 As shown, this embodiment is basically the same as the first embodiment, except that the inflation rod air nozzle 5 of this embodiment is connected to a straight inflation rod 98, and the straight inflation rod 98 can be used as an extension of the arm, so that the operator can connect the joint of the straight inflation rod 98 to the valve nozzle in the area that is difficult for the arm to enter.

[0140] Embodiment three:

[0141] like Figure 13As shown, this embodiment is basically the same as the first embodiment, except that a rubber inflation rod 99 is connected to the inflation nozzle 5 of the inflation rod in this embodiment. After the operator connects the joint of the rubber inflation rod 99 to the valve nozzle, the tire inflation can be controlled through the tire pressure gauge 8 and the pressure relief valve 7 at a safe position, avoiding the operator from being injured due to tire explosion accidents and greatly protecting the personal safety of the operator.

[0142] Embodiment Four:

[0143] As Figure 14 and Figure 15 shown, this embodiment is basically the same as Embodiment Two or Embodiment Three, except that the other end of the inflation rod 9 is connected with an inflation joint 91, and the inflation joint 91 is connected to the inflation rod 9 through an inflation rod interface 92.

[0144] For the joints on the market now, in order to ensure easy connection to the valve nozzle, the stability of the connection with the valve nozzle is reduced. Some joints require external assistance to inflate smoothly, and this method is extremely dangerous for the tires of large trucks or lorries. If a tire explosion accident occurs, it will inevitably cause casualties to the operator.

[0145] In this embodiment, an internal thread adapted to the valve nozzle is provided at the pipe orifice of the inflation joint 91, so that the inflation joint 91 can be screwed onto the valve nozzle, forming a stable connection between the inflation joint 91 and the valve nozzle. After the connection is completed, during inflation, the operator no longer needs to always be beside the tire to confirm the connection state between the inflation joint 91 and the valve nozzle.

[0146] The outer wall of the end of the inflation rod interface 92 inserted into the inflation rod 9 is provided with a serrated portion 95. The inclined surface on one side of the serrated portion 95 inserted into the inflation rod 9 is a forward tooth, which will not prevent the inflation rod interface 92 from being inserted into the inflation rod 9. The inclined surface on the other side of the serrated portion 95 is a reverse tooth, which can cooperate with the structure inside the inflation rod 9 to prevent the inflation rod interface 92 from falling off from the inflation rod 9.

[0147] The other end of the inflation rod interface 92 is connected to the inflation joint 91. An installation cavity 96 is formed inside the connection portion 311, and an installation channel is formed inside the inflation joint 91.

[0148] The core rod 93 is arranged inside the inflation joint 91. The core rod 93 includes an air inlet end 931 and an air outlet end 932. The outer diameter of the air outlet end 932 is adapted to the inner diameter of the installation channel, and the outer diameter of the air inlet end 931 is adapted to the inner diameter of the installation cavity 96. The outer diameter of the air inlet end 931 is larger than the inner diameter of the installation channel. Therefore, the air inlet end 931 of the core rod 93 is fixed between the installation cavity 96 and the inflation joint 91.

[0149] A through hole three 94 is formed in the core rod 93. The through hole three 94 near the pipe orifice end of the inflation joint 91 is widened along the radial direction of the core rod 93, and both ends of the core rod 93 are penetrated, so that air flow can flow into the inflation joint 91 from both sides of the core rod 93.

[0150] The above embodiments are only preferred embodiments of the present invention, and do not limit the protection scope of the present invention. Therefore, all equivalent changes made according to the structure, shape and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A tire inflation device, characterized in that, it comprises an air pipe assembly (1) for supplying air to the tire; an inflation rod (9) is provided at the front end of the air pipe assembly (1), and a hollow inflation joint (91) is provided at the other end of the inflation rod (9). An inner tube (11) is provided at the rear of the air pipe assembly (1), and ventilation holes (12) are provided on the surface of the inner tube (11); a sleeve (2) rotatably sleeved outside the inner tube (11); the two ends of the sleeve (2) and the inner tube (11) are sealed, and an air cavity (25) is formed between the sleeve (2) and the inner tube (11); the ventilation holes (12) communicate the air cavity (25) and the pipeline inside the inner tube (11); a tire pressure gauge (8) and a pressure relief valve (7) are provided on the side wall of the sleeve (2); the inner ends of the tire pressure gauge (8) and the pressure relief valve (7) are respectively communicated with the air cavity (25); the inflation joint (91) is connected to the inflation rod (9) through an inflation rod interface (92); the inflation joint (91) can be screwed onto the tire valve; a serrated portion (95) is provided on the outer wall of one end of the inflation rod interface (92) inserted into the inflation rod (9); the other end of the inflation rod interface (92) is connected to the inflation joint (91), and an installation cavity (96) is formed inside the connection portion of the inflation rod interface (92) and the inflation joint (91); a core rod (93) is inserted into the inflation joint (91); the core rod (93) includes an air inlet end (931) and an air outlet end (932), the air outlet end (932) passes through the inflation joint (91), and the air inlet end (931) is arranged in the installation cavity (96); a through hole three (94) is opened in the core rod (93), and the through hole three (94) near the pipe orifice of the inflation joint (91) is widened along the radial direction of the core rod (93) and penetrates through both ends of the core rod (93); the inner pipe wall in the middle of the sleeve (2) is thinned by 0.5 mm to 1 mm to form a widened portion (24), and the air cavity (25) is formed between the widened portion (24) and the outer wall of the inner tube (11), and the inner ends of the tire pressure gauge (8) and the pressure relief valve (7) are located inside the air cavity (25).

2. The tire inflation device according to claim 1, characterized in that, the pressure relief valve (7) is inserted into a pressure relief valve mounting hole (21) of the sleeve (2), and the bottom end of the tire pressure gauge (8) is inserted into a tire pressure gauge mounting hole (22) of the sleeve (2); a step portion two (23) is formed at one end of the pressure relief valve mounting hole (21) located outside the sleeve (2).

3. The tire inflation device according to claim 2, characterized in that, the pressure relief valve (7) includes a valve core two (71) and a valve body two (72), the valve body two (72) is screwed into the pressure relief valve mounting hole (21), the valve core two (71) is inserted into the valve body two (72), and the valve core two (71) includes a pressing portion (711) and a ventilation portion (712); The curved surface of the ventilation part (712) is recessed inward to form a clamping groove (714), and a second sealing ring (715) is arranged in the clamping groove (714).

4. A tire inflation device according to claim 1, characterized in that, One end of the air pipe assembly (1) is connected with a quick connector (3), and the quick connector (3) is used for connecting an inflation rod (9); The other end of the air pipe assembly (1) is connected with a control valve (6), and the control valve (6) is used for controlling the air flow to enter the inner pipe (11).

5. A tire inflation device according to claim 4, characterized in that, The quick connector (3) includes a housing (31), and a plurality of second through holes (38) are circumferentially arranged at the pipe orifice thereof; a one-way valve (4), which is arranged inside the housing (31) and is used for controlling the flow of gas in the housing (31); a steel ball (39), which is arranged in the second through hole (38), the diameter of the steel ball (39) is greater than the length of the second through hole (38), and the diameter of the steel ball (39) is adapted to the pipe diameter of the second through hole (38), so that the steel ball (39) can roll in the second through hole (38); a control sleeve (32), which is sleeved outside the housing (31) and can control the position of the steel ball (39) in the second through hole (38).

6. A tire inflation device according to claim 5, characterized in that, The one-way valve (4) includes: a first valve core (41), the first valve core (41) is composed of a control piston (411) and a docking part (412), a gas channel (4111) is opened inside the control piston (411), the inner side of the docking part (412) is formed into a docking cavity (413), and the gas channel (4111) is communicated with the docking cavity (413); a first valve body (42), the outer diameter of the control piston (411) is adapted to the inner diameter of the first valve body (42), and the control piston (411) penetrates into the first valve body (42); a first through hole (4112) is opened on the pipe wall of the control piston (411), and the first through hole (4112) is used for communicating the gas channel (4111) with the inside of the housing (31); The connection area between the control piston (411) and the docking part (412) is formed into a first step part (414), and the outer diameter of the first step part (414) is the same as the outer diameter of the first valve body (42).

7. A tire inflation device according to claim 6, characterized in that, One end of the housing (31) is a connection part (311), and the connection part (311) is used for connecting the housing (31) with an inflation rod; The inner wall at the pipe orifice of the housing (31) protrudes inward to form a positioning part (312), and the second through hole (38) is arranged in the positioning part (312); a sliding part (313), which is located between the connection part (311) and the positioning part (312), and the sliding part (313) is used for allowing the one-way valve (4) to move in the housing (31).

8. A tire inflation device according to claim 5 or 7, characterized in that, one end of the inflation rod (9) is provided with an inflation rod nozzle (5); the inflation rod (9) is connected to the quick-connect joint (3) through the inflation rod nozzle (5); a trapezoidal groove (53) is provided on the inflation rod nozzle (5), and when the trapezoidal groove (53) is aligned with the second through hole (38), the steel ball (39) can enter the trapezoidal groove (53).

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