CN218198219U - Tire inflation device - Google Patents

Abstract

The utility model relates to a tire inflation technical field refers in particular to a tire inflation device. The tire pressure gauge comprises an inner tube and a sleeve sleeved on the outer side of the inner tube, wherein a tire pressure gauge mounting hole and a pressure relief valve mounting hole are formed in the side wall of the sleeve; the pipe wall of the inner side of the sleeve is thinned by 0.5 mm-1 mm to form a widened part, and one ends of the tire pressure meter mounting hole and the pressure release valve mounting hole which are positioned at the inner side of the sleeve are positioned in the widened part; an air cavity is formed between the widened part and the outer wall of the inner pipe, a plurality of vent holes are formed in the pipe wall of the inner pipe, and the vent holes conduct the inside of the inner pipe and the air cavity; the inner sides of the two ends of the sleeve are respectively provided with a plurality of grooves IV, and the grooves IV are internally provided with sealing rings IV. The tire pressure meter can use the axis of tire pressure meter mounting hole as the center and rotate, and the control cover suit is in the inner tube outside, and the control cover can use the axis of inner tube as the center and rotate, through the rotation in two directions, can adjust the dial plate of tire pressure meter to arbitrary direction to the reading of tire pressure meter is read at any time to operating personnel.

Description

Tire inflation device

Technical Field

The utility model relates to a tire inflation technical field refers in particular to a tire inflation device.

Background

Truck transport plays a significant role as a primary mode of transportation, both during periods of rapid economic development and during periods of epidemic disease. In recent years, the accident that the tire explodes when being inflated frequently occurs, when the tire explodes, people nearby easily injure or cause property loss, and the large tire used by most types of trucks has larger volume, so the power during explosion is increased. Therefore, the existing tire inflation device is often provided with a tire pressure meter to monitor the tire pressure of the inflated tire so as to avoid casualties and property loss caused by tire explosion.

The prior technical scheme has the following defects:

1. the tire pressure gauge is fixed on the tire inflation device, or the tire pressure gauge can only rotate in a single direction, and an operator is often inconvenient to observe the reading on the tire pressure gauge when the tire pressure gauge is used.

2. The connection between tire aerating device and the inflation pole is not convenient for install and dismantle, when need changing the inflation pole to the use scene of difference under, the operation is comparatively loaded down with trivial details, if personnel's operation is careless, the junction fails to reach sealed requirement to can lead to gas leakage because the sealed effect of junction is not enough.

3. When the existing inflation connector is connected with the inflating valve of the tire, if the existing inflation connector is not supported by external force, the connection between the inflation connector and the inflating valve is unstable, the tire can not be inflated smoothly, and if an operator holds the inflation rod by hand, pressure is applied to the inflation connector, and the operator needs to be exposed in front of the tire, so that great potential safety hazards are generated.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a simple structure, convenient operation, the tire gauge can turn to arbitrary direction, is convenient for install or dump the tire inflation device that the pole just has good leakproofness.

The utility model aims at realizing the following steps:

a tire inflation apparatus includes

An air tube assembly for supplying air to the tire; the front end of the air pipe assembly is provided with an inflating rod, the rear part of the air pipe assembly is provided with an inner pipe, and the surface of the inner pipe is provided with a vent hole;

the sleeve is rotatably sleeved on the outer side of the inner pipe; the two end parts of the sleeve and the inner pipe are sealed, and an air cavity is formed between the sleeve and the inner pipe; the vent hole is communicated with the air cavity and a pipeline inside the inner pipe;

a tire pressure meter and a pressure relief valve are arranged on the side wall of the sleeve; the inner ends of the tire pressure meter and the pressure release valve are respectively communicated with the air cavity.

Preferably, the wall of the inner pipe in the middle of the sleeve pipe is thinned by 0.5-1 mm to form a widened part, the air cavity is formed between the widened part and the outer wall of the inner pipe, and the inner ends of the tire pressure gauge and the pressure release valve are located in the air cavity.

Preferably, the pressure relief valve is arranged in the pressure relief valve mounting hole of the sleeve in a penetrating manner, and the bottom end of the tire pressure meter is arranged in the tire pressure meter mounting hole of the sleeve in a penetrating manner;

and a step part II is formed at one end of the pressure relief valve mounting hole, which is positioned on the outer side of the sleeve.

Preferably, the pressure relief valve comprises a second valve core and a second valve body, the second valve body is screwed into the pressure relief valve mounting hole, the second valve core is arranged in the second valve body in a penetrating manner, and the second valve core comprises a pressing part and a ventilation part;

the curved surface of the ventilation part is sunken towards the inner side to form a clamping groove, and a second sealing ring is arranged in the clamping groove.

Preferably, one end of the air pipe assembly is connected with a quick connector, and the quick connector is used for connecting an inflation rod;

the other end of the air pipe assembly is connected with a control valve, and the control valve is used for controlling air flow to enter the inner pipe.

Preferably, the quick-connect joint comprises

A plurality of second through holes are circumferentially formed in the pipe orifice of the shell;

a check valve inserted into the inner side of the housing and used for controlling the flow of gas in the housing;

the steel ball is arranged in the second through hole, the diameter of the steel ball is larger than the length of the second through hole, and the diameter of the steel ball is matched with the pipe diameter of the second through hole, so that the steel ball can roll in the second through hole;

and the control sleeve is sleeved on the outer side of the shell and can control the position of the steel ball in the second through hole.

Preferably, the check valve includes:

the valve core I consists of a control piston and a butt joint part, a gas channel is formed in the control piston, a butt joint cavity is formed on the inner side of the butt joint part, and the gas channel is communicated with the butt joint cavity;

the outer diameter of the control piston is matched with the inner diameter of the valve body I, and the control piston penetrates into the valve body I;

a first through hole is formed in the pipe wall of the control piston and is used for communicating the gas channel with the interior of the shell;

and a connecting area between the control piston and the butt joint part is formed into a first step part, and the outer diameter of the first step part is the same as that of the first valve body.

Preferably, one end of the shell is a connecting part, and the connecting part is used for connecting the shell with an inflating rod;

the inner wall at the opening of the shell pipe protrudes inwards to form a positioning part, and the through hole II is arranged in the positioning part;

a sliding portion located between the connecting portion and the positioning portion, the sliding portion being for movement of the check valve within the housing.

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

connecting the inflating rod with the quick connector through the inflating rod air nozzle;

the air nozzle of the inflating rod is provided with a trapezoidal groove, and when the trapezoidal groove is aligned with the through hole, the steel ball can enter the trapezoidal groove.

Preferably, the inflation joint is connected with the inflation rod through an inflation rod interface;

the inflation joint can be screwed on the tire valve;

the outer wall of one end of the inflation rod interface, which is inserted into the inflation rod, is provided with a sawtooth part;

the other end of the inflation rod interface is connected with the inflation joint, and a mounting cavity is formed in a connecting part of the inflation rod interface and the inflation joint;

a core rod penetrates through the inflation connector;

the core bar comprises an air inlet end and an air outlet end, the air outlet end penetrates through the inflation connector, and the air inlet end is arranged in the mounting cavity;

a third through hole is formed in the core rod, the third through hole close to one end of the pipe orifice of the inflation connector is widened along the radial direction of the core rod, and two ends of the core rod are communicated.

Compared with the prior art, the utility model outstanding and profitable technological effect is:

1. the tire pressure meter is arranged on the control sleeve in a penetrating mode, the control sleeve can rotate by taking the axis of the mounting hole of the tire pressure meter as the center, the control sleeve is sleeved outside the inner tube, the control sleeve can rotate by taking the axis of the inner tube as the center, and the dial plate of the tire pressure meter can be adjusted to any direction through rotation in two directions, so that an operator can read the reading of the tire pressure meter at any time.

2. The utility model discloses be provided with control flap and relief valve, when the tire pressure of operating personnel discovery tire was too big, can block the air current through control flap and continue to supply to the tire, later through the tire pressure of relief valve adjustment tire.

3. The inner tube is connected with the inflation rod through the quick connector, and the time for installing and detaching the inflation rod can be shortened on the premise of ensuring the sealing performance when the inflation rod is replaced, so that the efficiency is improved.

4. The utility model discloses a connect soon connect with aerify the pole separation in, can pop out the pole air cock of aerifing of pole from connecting soon in, and can not stay the pole air cock of aerifing in connecting soon, obviously demonstrate the pole of aerifing and connect the present relation of connection of connecting soon to play the effect of reminding operating personnel, avoid aerifing not zonulae occludens between pole and the connecting soon, thereby lead to leaking gas.

5. The utility model discloses a can the spiro union inflation connection on the inflating valve of tire to strengthened the fastening of being connected between inflation connection and the inflating valve, after inflation connection is connected with the inflating valve, tire aerating device can independently inflate the tire, and operating personnel need not to stop at the scene, has reduced the possibility of casualties when taking place the tire explosion. A section of hard inflating rod is connected to the inflating joint, so that an operator can connect the inflating joint to the inflating valve with an arm difficult to extend.

Drawings

Fig. 1 is a structural view of the present invention.

Fig. 2 is an exploded view of the present invention.

Fig. 3 is a front view of the present invention when the inflation rod is not connected.

Fig. 4 isbase:Sub>A sectional view taken alongbase:Sub>A-base:Sub>A in fig. 3.

Fig. 5 is an enlarged view of a in fig. 4.

Fig. 6 is an exploded view of the quick connect coupling and the air faucet of the inflation stem of the present invention.

Fig. 7 is a partial sectional view taken along line B-B in fig. 4.

Fig. 8 is a sectional view taken along line C-C in fig. 7.

Fig. 9 is a sectional view of the housing taken in section D-D in fig. 8.

Fig. 10 is an enlarged view of B in fig. 7.

FIG. 11 is a cross-sectional view of the quick connect coupling and air faucet of the inflation stem of FIG. 8 taken along line D-D as shown in FIG. 8.

Fig. 12 is a structural view of a second embodiment of the present invention.

Fig. 13 is a structural diagram of a third embodiment of the present invention.

Figure 14 is a top view of the inflation fitting of the present invention.

Fig. 15 is a cross-sectional view of the inflation fitting of the present invention.

Reference numerals are as follows: 1-a gas tube assembly; 11-an inner tube; 12-a vent hole;

2-a sleeve; 21-a relief valve mounting hole; 22-tire gauge mounting holes; 23-step two; 24-a widening; 25-air cavity; 26-groove four; 27-sealing ring four; 28-a friction portion;

3-quick-connect joint; 31-a housing; 311-a connecting portion; 312-a positioning section; 3121-a stopper; 3122-bevel I; 3123-bevel II; 313-a slide; 314-a snap-in part; 315-groove two; 316-step three; 32-a control sleeve; 33-a linker tube; 34-spring three; 35-a clamp spring; 36-a boss; 37-pushing the bevel; 38-through hole two; 39-steel balls;

4-a one-way valve; 43-spring one; 44-a sealing gasket; 441-chimb;

41-valve core one; 411-control piston; 4111-a gas channel; 4112-a first through hole; 4113-groove five; 4114-seal ring five; 412-a docking station; 4121-positioning bevel one; 413-a docking chamber; 4131-positioning bevel two; 4132-caulking groove; 414-step one;

42-valve body one; 421-a baffle plate; 422-groove one; 423-sealing ring one;

5-inflating rod air tap; 51-an insertion portion; 52-locating boss; 53-trapezoidal trenches; 54-inclined plane three;

6-control valve; 61-valve tube; 62-ball valve; 63-valve switching;

7-a pressure relief valve; 71-valve core two; 711-a pressing part; 712-a vent; 713-connecting rod; 714-card slot; 715-sealing ring two; 72-valve body two; 721-groove three; 722-sealing ring III; 723-positioning inclined plane three; 73-spring two;

8-a tire pressure meter;

9-inflating rod; 91-inflation joints; 92-an inflation stem interface; 93-core rod; 931-an air inlet end; 932-an air outlet end; 94-through hole three; 95-serrations; 96-mounting cavity; 97-double-ended inflation stem; 98-straight inflation rod; 99-rubber inflation rod.

Detailed Description

The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.

The first embodiment is as follows:

as shown in fig. 1 to 5, a tire inflation apparatus includes an air tube assembly 1 for supplying air to a tire, an inflation rod 9 provided at a front end of the air tube assembly 1, an inner tube 11 provided at a rear portion of the air tube assembly 1, and a vent hole 12 provided at a surface of the inner tube 11;

the sleeve 2 is rotatably sleeved on the outer side of 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 vent hole 12 communicates the air chamber 25 with the duct inside the inner tube 11. The sleeve 2 can be made of elastic materials such as rubber, and meanwhile, the friction force provided by the materials is convenient for an operator to rotate the sleeve 2, so that the comfort degree of the operator in gripping is also improved.

The tire pressure meter mounting hole 22 and the pressure release valve mounting hole 21 are formed in the side wall of the sleeve 2, the inner end of the tire pressure meter 8 can be placed in the tire pressure meter mounting hole 22, the inner end of the pressure release valve 7 can be placed in the pressure release valve mounting hole 21, interference fit is formed among the tire pressure meter 8, the tire pressure meter mounting hole 22, the pressure release valve 7 and the pressure release valve mounting hole 21, and the inner ends of the tire pressure meter 8 and the pressure release valve 7 are respectively communicated with the air cavity 25.

When the tire pressure gauge 8 is placed in the tire pressure gauge mounting hole 22 or the relief valve 7 is placed in the relief valve mounting hole 21, the sleeve 2 having elasticity is pressed to contract. After the tire pressure gauge 8 and the pressure relief valve 7 are assembled, the sleeve 2 is not stressed any more, and the elastic force accumulated in the sleeve is released, so that the tire pressure gauge mounting hole 22 or the pressure relief valve mounting hole 21 tightly wraps the portion of the tire pressure gauge 8 or the pressure relief valve 7 inserted into the sleeve 2, and a certain friction force is provided to fix the tire pressure gauge 8 and the pressure relief valve 7. The opening depths of the tire pressure gauge mounting hole 22 and the relief valve mounting hole 21 are 12mm, and the portions of the tire pressure gauge 8 and the relief valve 7 inserted into the sleeve 2 are not more than 12mm.

The tire pressure gauge 8 and the part inserted into the sleeve 2 are rotationally connected, and when the tire pressure gauge 8 is assembled in the tire pressure gauge mounting hole 22, the tire pressure gauge 8 can still rotate. Sleeve pipe 2 can rotate in the outside of inner tube 11, through rotation between tire pressure meter 8 and the sleeve pipe 2 and the rotation between sleeve pipe 2 and the inner tube 11 for tire pressure meter 8 can rotate on the plane of two differences, thereby makes tire pressure meter 8 more nimble, can aim at arbitrary direction with the dial plate of tire pressure meter 8, is convenient for let the number on the tire pressure meter 8 dial plate that operating personnel seen under different environment.

As shown in fig. 4 and 5, the wall of the middle part of the casing 2 is thinned by 0.5mm to 1mm to form a widened part 24, and the range of the widened part 24 at least includes the axial positions of the tire pressure meter mounting hole 22 and the pressure release valve mounting hole 21, so as to ensure that the inner ends of the tire pressure meter 8 and the pressure release valve 7 are located inside the air cavity 25.

After the sleeve 2 is sleeved on the outer side of the inner tube 11, an air cavity 25 is formed between the widened part 24 and the outer wall of the inner tube 11, and since the ends of the tire pressure gauge mounting hole 22 and the pressure release valve mounting hole 21 located on the inner side of the sleeve 2 are located in the widened part 24, the ends of the tire pressure gauge mounting hole 22 and the pressure release valve mounting hole 21 located on the inner side of the sleeve 2 are also located in the air cavity 25. In this embodiment, the tube wall of the inner tube 11 is provided with four vent holes 12, each two vent holes 12 aligned are a group, each group of vent holes 12 corresponds to the positions of the tire pressure gauge mounting hole 22 or the relief valve mounting hole 21, and when the sleeve 2 rotates outside the inner tube 11, the gas in the inner tube 11 can be distributed in the gas cavity 25 more uniformly.

When being full of gas in the inner tube 11, gas can be full of air cavity 25 through air vent 12, because the part that tire pressure meter 8 and relief valve 7 inserted in sleeve pipe 2 is no longer than the trompil degree of depth of tire pressure meter mounting hole 22 and relief valve mounting hole 21, consequently when rotating sleeve pipe 2, tire pressure meter 8 and relief valve 7 can not collide with inner tube 11, and the air current still can get into among the air cavity 25 through air vent 12, the inside and the air cavity 25 intercommunication of inner tube 11, tire pressure meter 8 can know the inside pressure of inner tube 11 through measuring the pressure in the air cavity 25. When the pressure release valve 7 discharges the gas in the gas cavity 25, the gas in the inner tube 11 can enter the gas cavity 25 for supplement due to the reduction of the gas pressure in the gas cavity 25, so that the pressure release valve 7 can discharge the gas in the inner tube 11, and the pressure release function is realized. By arranging the air cavity 25-the vent hole 12, the normal operation of the pressure relief valve 7 and the tire pressure gauge 8 can be guaranteed not to be affected when the inner tube 11 and the sleeve 2 rotate relatively, and when the inner tube 11 and the sleeve 2 rotate relatively, the port of the vent hole 12 positioned outside the inner tube 11 also rotates inside the air cavity 25, so that the air is distributed more uniformly in the air cavity 25.

In this embodiment, two grooves four 26 are respectively formed on the inner sides of the two ends of the sleeve 2, a sealing ring four 27 is arranged in each groove four 26, because for the convenience of sleeving the sleeve 2 on the outer side of the inner tube 11, the inner diameter of the sleeve 2 is slightly larger than the outer diameter of the inner tube 11, a small gap is left between the sleeve 2 and the inner tube 11, two sealing rings four 27 arranged on each side can form two layers of sealing, the air tightness between the sleeve 2 and the inner tube 11 can be better ensured, and the air pressure of the air cavity 25 can be maintained.

The inner diameter of one end of the sleeve 2 is reduced to form a friction part 28, the inner diameter of the friction part 28 is matched with the outer diameter of the inner pipe 11, the sleeve 2 is made of rubber in the embodiment, and when the inner diameter of one end of the sleeve 2 is reduced to be the same as the outer diameter of the inner pipe 11, friction force can be generated when relative displacement occurs between the sleeve 2 and the inner pipe 11. The friction portion 28 makes the sleeve 2 not easily move in a standing state by a friction force generated when the sleeve 2 and the inner tube 11 are attached, thereby fixing the position of the sleeve 2 on the inner tube 11, keeping the air chamber 25 aligned with the vent hole 12, and maintaining the air pressure in the air chamber 25.

And a friction part 28 is provided only at one end of the sleeve 2 so as to be easily fitted to the outside of the inner pipe 11 using the other end of the sleeve 2 at the time of assembly.

As shown in fig. 2 to 5, the relief valve 7 is inserted into the relief valve mounting hole 21, and the bottom end of the tire pressure gauge 8 is inserted into the tire pressure gauge mounting hole 22.

One end that relief valve mounting hole 21 is located the sleeve pipe 2 outside is formed with step portion two 23, and the degree of depth of step portion two 23 is 1mm, and the external diameter of relief valve 7 is a bit bigger than relief valve mounting hole 21's internal diameter, sets up step portion two 23 and can make sleeve pipe 2 leave the space of deformation when receiving the extrusion of relief valve 7, is convenient for make relief valve 7 wear to establish to the relief valve mounting hole 21 in. The top end of the second valve body 72 of the pressure relief valve 7 can also be attached to the second step portion 23, and the sleeve 2 is deformed through extrusion, so that the sleeve 2 is attached to the second valve body 72, and the sealing function is realized.

The second valve body 72 of the pressure relief valve 7 is provided with the third groove 721 on the outer side, the third sealing ring 722 is arranged in the third groove 721, and because the outer diameter of the third groove 721 is smaller than the outer diameter of the bottom end of the second valve body 72, when the third sealing ring 722 is arranged in the third groove 721, the contact area between the third sealing ring 722 and the pressure relief valve mounting hole 21 can be reduced, the friction force is reduced, and the pressure relief valve 7 can be conveniently arranged in the pressure relief valve mounting hole 21 in a penetrating manner. And the external diameter of the top end of the second valve body 72 is slightly smaller than the external diameter of the third sealing ring 722 sleeved outside the third groove 721, so that the third sealing ring 722 can be pushed, and the third sealing ring 722 is not easy to be separated from the third groove 721. After the relief valve 7 is assembled, the third sealing ring 722 is tightly attached to the inner wall of the relief valve mounting hole 21 to form a seal.

As shown in fig. 4 and 5, the pressure relief valve 7 includes the second valve element 71 and the second valve body 72, and the second valve body 72 is screwed into the pressure relief valve mounting hole 21, so that the inner wall of the sleeve 2 and the outer wall of the second valve body 72 can be tightly attached together, thereby providing a good sealing effect, avoiding air leakage, and facilitating the installation of the pressure relief valve 7. The second valve element 71 is arranged in the second valve body 72 in a penetrating mode, the second valve element 71 comprises a pressing portion 711 and a ventilation portion 712, the inner diameter of the lower side of the second valve body 72 is slightly larger than the outer diameter of the ventilation portion 712 and smaller than the diameter of the pressing portion 711, the ventilation portion 712 can penetrate through the second valve body 72, and the pressing portion 711 cannot penetrate through the second valve body 72.

The area where the inner diameter of the second valve body 72 changes is formed into a positioning inclined surface third 723, and when the relief valve 7 is assembled, the positioning inclined surface third 723 facilitates the vent part 712 of the second valve core 71 to penetrate through the second valve body 72, so that the assembly process is optimized. In use, the pressing portion 711 is limited by the positioning slope 723 and cannot pass through the valve body two 72. A cylindrical connecting rod 713 is arranged between the pressing part 711 and the ventilation part 712, a second spring 73 is sleeved on the outer side of the connecting rod 713, one end of the second spring 73 abuts against the bottom surface of the pressing part 711 of the second valve core 71, the other end of the second spring 73 abuts against the third positioning inclined surface 723, and the second spring 73 is used for enabling the second valve core 71 to reset so as to ensure that the relief valve 7 is in a closed state when standing.

The shape of pressing the portion 711 is the coaxial cylinder of reducing, presses the diameter of the great one end of the portion 711 diameter of pressing to be greater than the internal diameter of two 72 upper ends of valve body, presses the diameter of the less one end of the portion 711 diameter of pressing to be slightly less than the internal diameter of two 72 upper ends of valve body, makes to form tiny clearance between pressing the portion 711 and the inner wall of two 72 upper ends of valve body, and through pressing the portion 711 of pressing down during the use, can make two 73 contractions of spring, open relief valve 7.

The diameter of the vent part 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 vent part 712 and the inner wall of the lower end of the second valve body 72, the curved surface of the vent part 712 is recessed inwards to form a clamping groove 714, a second sealing ring 715 is arranged in the clamping groove 714 and used for blocking the small gap formed between the vent part 712 and the inner wall of the lower end of the second valve body 72, and the second sealing ring 715 is fixed in the clamping groove 714 and can move along with the second valve core 71.

When the pressing part 711 is pressed, the second valve element 71 moves, the second fixed sealing ring 715 moves along with the second valve element, so that the gap between the vent part 712 and the second valve body 72 is not blocked, and at the moment, air flow can flow out through the gap between the vent part 712 and the second valve body 72, thereby realizing the pressure relief effect.

When the pressing part 711 is loosened, the second spring 73 pushes the pressing part 711 to reset the second valve core 71, and because the cross section of the ventilation part 712 is in an I shape, the bottom end of the ventilation part 712 drives the second sealing ring 715 to move in reverse until the second sealing ring 715 abuts against the bottom end of the second valve body 72, and because the outer diameter of the second sealing ring 715 is far larger than the inner diameter of the opening at the bottom end of the second valve body 72, the second sealing ring 715 cannot pass through. The second sealing ring 715 is deformed by the force transmitted from the vent part 712 until the second sealing ring 715 is sealed to seal a small gap between the vent part 712 and the inner wall of the lower end of the second valve body 72.

The pressing part 711 positioned on the upper side of the second valve body 72 cannot penetrate through the second valve body 72, and the vent part 712 cannot penetrate through the second valve body 72 after penetrating through the second valve body 72 and being sleeved with the second sealing ring 715, so that the second valve core 71 is limited and the second valve core 71 is limited in the second valve body 72. The stability of the pressure release valve 7 is maintained, and the durability of the product is improved.

As shown in fig. 2-3-4 and 6, one end of the inner tube 11 is connected to the quick connector 3, the quick connector 3 is used for connecting the inflation rod 9, and the gas is sent into the inflation rod 9 through the quick connector 3.

The other end of inner tube 11 connects control valve 6, and control valve 6 is used for controlling the air current to get into inner tube 11, and in this embodiment, control valve 6 is ball valve 62, and ball valve 62 sets up in valve pipe 61 to be connected to inner tube 11 through valve pipe 61, valve pipe 61 can not set up the same side at inner tube 11 with quick-connect joint 3.

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, and if the tire pressure is too high, close the ball valve 62 by the control of the valve switch 63, thereby stopping the gas supply of the tire inflator, and then discharge the excessive gas in the tire inflator through the relief valve 7.

The ball valve 62 used in this embodiment is an optional structure of the control valve 6, and the structure of the control valve 6 is not limited herein, and only the function of the control valve 6 is illustrated here. In other embodiments, the control valve 6 may be selected from other valve configurations that may perform the same function.

As shown in fig. 2 to 11, in the present embodiment, the quick-connect coupling 3 includes a housing 31 and a check valve 4, and the check valve 4 is disposed inside the housing 31.

Six through holes two 38 are arranged at the pipe orifice of the shell 31, the through holes two 38 are circumferentially arranged at the pipe orifice of the shell 31, and the spacing angle between every two through holes two 38 is 60 degrees.

And a check valve 4 inserted into the inside of the housing 31 and controlling the flow of gas in the housing 31. When the air tap 5 of the inflation rod is inserted into the shell 31, the one-way valve 4 is opened, so that the inside of the shell 31 is communicated with the air tap 5 of the inflation rod, and air flow enters the inflation tube through the quick connector 3.

And the 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 matched with the pipe diameter of the second through hole 38, so that the steel ball 39 can roll in the second through hole 38. When the air valve 5 is connected to the housing 31, the steel balls 39 are inserted into the trapezoidal grooves 53, so that the housing 31 is engaged with the air valve 5, thereby fixing the air valve 5 to the housing 31.

And the control sleeve 32 is sleeved on the outer side of the shell 31 and can control the position of the steel ball 39 in the second through hole 38, and the connection between the inflating rod air nozzle 5 and the shell 31 can be controlled by changing the position of the steel ball 39 in the second through hole 38.

Still be provided with linking pipe 33 between inner tube 11 and the quick-connect coupling 3, inner tube 11 is connected through linking pipe 33 with quick-connect coupling 3, can make quick-connect coupling 3 be connected with the inner tube 11 of multiple different models through the linking pipe 33 of changing the adaptation, has increased quick-connect coupling 3's suitability, and the user need not purchase the inner tube 11 that corresponds the specification again and can use quick-connect coupling 3, has improved user's comfort level.

As shown in figures 6-11 of the drawings,

the first valve core 41 and the first valve core 41 are composed of a control piston 411 and an abutting part 412, the control piston 411 is one end of the first valve core 41 with a smaller outer diameter, and the abutting part 412 is one end of the first valve core 41 with a larger outer diameter. An air passage 4111 is formed inside the control piston 411, a butt joint cavity 413 is formed inside the butt joint part 412, the butt joint cavity 413 is used for being in butt joint with an air nozzle 5 of the inflation rod, and the air passage 4111 is communicated with the butt joint cavity 413.

The outer diameter of the first valve body 42 and the outer diameter of the control piston 411 are matched with the inner diameter of the first valve body 42, so that the control piston 411 can penetrate into the first valve body 42, and the control piston 411 can move in the axial direction.

The first through hole 4112 is formed in a pipe wall of the control piston 411 extending into the first valve body 42, and when the first valve body 42 covers the pipe wall provided with the first through hole 4112, the check valve 4 is in a closed state. At this moment, the first through hole 4112 is located inside the first valve body 42, and the inner wall of the first valve body 42 is attached to the surface of the control piston 411, so that the first through hole 4112 can be plugged, and the space in the check valve 4 is separated from the space in the housing 31.

Two grooves five 4113 are formed in the outer wall of the control piston 411, the grooves five 4113 are distributed on two sides of the first through hole 4112 along the axis direction of the control piston 411, and sealing rings five 4114 are arranged in the grooves five 4113. The distance between five grooves 4113 is smaller than the length of one valve body 42, the control piston 411 extends into the one valve body 42, the one valve body 42 can cover the areas where the first through hole 4112 and the fifth sealing ring 4114 are located, the fifth sealing ring 4114 is attached to the inner wall of the one valve body 42, sealing is formed on two sides of the first through hole 4112, airflow between the housing 31 and the gas channel 4111 is blocked, and the check valve 4 is in a closed state at the moment.

The connecting area between the control piston 411 and the abutting portion 412 is formed as a step portion one 414, and the outer diameter of the step portion one 414 is the same as that of the valve body one 42. Since the abutting portion 412 is formed with the abutting cavity 413 inside, the wall thickness of the junction of the abutting portion 412 and the control piston 411 is thin. The first step portion 414 is provided to improve the problem of the thin wall thickness at the joint of the abutting portion 412 and the control piston 411, enhance the structural strength at the joint between the control piston 411 and the abutting portion 412, and avoid the occurrence of fracture between the abutting portion 412 and the control piston 411.

The inner diameter of abutment 412 is slightly larger than the outer diameter of insertion portion 51 of air faucet 5 of the inflation wand so that insertion portion 51 extends into abutment 412. An embedded groove 4132 is formed in the butt joint cavity 413, a sealing gasket 44 is embedded in the embedded groove 4132, the edge of the opening in the middle of the sealing gasket 44 is protruded to form a convex edge 441, and the cross section of the convex edge 441 is triangular.

A second positioning inclined plane 4131 is formed at the opening of the docking cavity 413, so that the inner diameter of the docking cavity 413 towards the direction of the pipe orifice is gradually increased, and the opening of the docking cavity 413 is expanded into a bell mouth shape.

When the flared butt joint cavity 413 is connected with the air faucet 5 of the inflation rod, the compression joint inclined side inner sealing mode is adopted for sealing, and the end face of the pipe is prevented from contacting with fluid, so that the problem of damage to the multilayer structure of the pipe due to end face corrosion is reduced.

The flared butt joint cavity 413 is convenient and quick to install and easy to operate, and the joint can be repeatedly disassembled and assembled. After the connection is finished, the medium can be conveyed without waiting for solidification or cooling, and the method is very convenient for the pipeline needing decoration, modification and renewal. Reliable installation performance and good sealing performance, does not need to consider the anti-slip measures of the pipe joint, reduces the difficulty of assembly,

when the inflation rod air nozzle 5 is connected with the quick connector 3, the second positioning inclined surface 4131 plays a role in guiding the inflation rod air nozzle 5, the trumpet-shaped opening facilitates the insertion part 51 to enter the butt joint cavity 413, and when the insertion part 51 contacts the second positioning inclined surface 4131, the insertion part is pushed to the center of the butt joint cavity 413 by the inclined surface.

Meanwhile, the inclination angle of the second positioning inclined surface 4131 is the same as the inclination angle of the third inclined surface 54 of the air inflation rod air nozzle 5, and after the air inflation rod air nozzle 5 is placed in the butt joint cavity 413, the air inflation rod air nozzle 5 pushes the first valve core 41. The second locating inclined plane 4131 is attached to the third inclined plane 54, so that the pressure between the first valve core 41 and the air faucet 5 of the inflation rod can be effectively reduced, the first valve core 41 is prevented from being damaged due to local over-pressure, and the service life of a product is prolonged.

The outer side of the first valve body 42 is provided with a baffle 421, and the first valve body 42 is fixed inside the shell 31 through the baffle 421.

A first spring 43 is arranged outside the control piston 411, one end of the first spring 43 abuts against the abutting part 412, and the other end of the first spring 43 abuts against one end face of the baffle 421 facing the abutting part 412. Since the outer diameter of the first stepped portion 414 is the same as the outer diameter of the first valve body 42, the first stepped portion 414 can also serve to position the first spring 43, so that the end of the first spring 43 abutting against the abutting portion 412 cannot easily move, and the first spring 43 is kept in a compressed or expanded state along the axial direction.

When the inflation rod nozzle 5 is connected to the housing 31 of the quick connector 3, the inflation rod nozzle 5 pushes the first valve element 41, and the first spring 43 maintains the elastic potential energy state due to the engagement between the housing 31 and the inflation rod nozzle 5 caused by the steel balls 39. When the inflation rod air nozzle 5 needs to be pulled out, the housing 31 and the inflation rod air nozzle 5 are not clamped and fixed to each other, and the first spring 43 pushes the abutting portion 412 to drive the first valve element 41 to reset and transmit a part of energy to the inflation rod air nozzle 5. And due to inertia, the air lever nozzle 5 will pop out of the quick connect coupling 3.

And the first spring 43 can not push the air nozzle 5 of the inflation rod only when the air nozzle 5 of the inflation rod and the quick connector 3 are mutually clamped through the steel ball 39. Therefore, the air nozzle 5 of the inflation rod cannot be popped out of the shell 31, and through the design, an operator can be reminded in a visually and tactually obvious mode, the connection state between the air nozzle 5 of the inflation rod and the quick connector 3 is obviously shown, and the air leakage caused by untight connection is reduced.

The first valve body 42 is provided with a first groove 422, the first groove 422 is close to the end face of the baffle 421, which is not provided with the first spring 43, and a first sealing ring 423 is arranged in the first groove 422, and the baffle 421 is close to the joint of the shell 31 and the connecting pipe 33, so that the first sealing ring 423 needs to be arranged for sealing. The first groove 422 serves to fix the position of the first gasket 423, and when the adapter tube 33 is coupled to the housing 31, the inner space is not enough to accommodate the first gasket 423, and the first groove 422 may be used to accommodate the first gasket 423. When the first sealing ring 423 is pressed by the connecting pipe 33, the baffle 421 can support the first sealing ring 423 against displacement, so that the pressed first sealing ring 423 is attached to the edge of the connecting pipe 33 to realize the sealing function.

As shown in fig. 7-11, one end of the housing 31 is a connecting part 311, the connecting part 311 is used for connecting the housing 31 to the inflation rod 9, and in this embodiment, the connecting part 311 of the housing 31 and the connecting tube 33 are connected into a whole by screwing.

The inner wall of the shell 31 at the pipe orifice protrudes inwards to form a positioning part 312, and the second through hole 38 is arranged in the positioning part 312.

And a sliding part 313 located between the connecting part 311 and the positioning part 312, wherein the inner diameter of the sliding part 313 is matched with the outer diameter of the outer side of the abutting part 412, and the sliding part 313 is used for allowing the one-way valve 4 to move in the shell 31.

After the check valve 4 is assembled, the limiting portion 3121 formed on the positioning portion 312 plays a role of limiting the movement of the check valve 4. The sliding portion 313 is used to move the first spool 41 of the check valve 4. The transition area between the positioning portion 312 and the sliding portion 313 is formed as a first inclined surface 3122, and the first inclined surface 3122 guides the direction of the first valve spool 41 when the check valve 4 is assembled to the inside of the housing 31, which facilitates the accurate installation of the first valve spool 41.

The outer diameter of the abutting cavity 413 is matched with the inner diameter of the positioning portion 312, the abutting cavity 413 abuts against the limiting portion 3121, a first positioning inclined surface 4121 is arranged on the outer side of the abutting portion 412, and the inclination angle of the first positioning inclined surface 4121 is smaller than that of the first inclined surface 3122, so that the first inclined surface 3122 can clamp the first valve core 41, and the position of the check valve 4 is fixed.

The transition area between the connection portion 311 and the sliding portion 313 is formed as the second inclined surface 3123, the edge of the blocking plate 421 abuts against the second inclined surface 3123, and after the connection pipe 33 is connected to the housing 31, the blocking plate 421 is clamped between the second inclined surface 3123 and the connection pipe 33, thereby fixing the first valve body 42 by the blocking plate 421.

The outer side of the shell 31 is sleeved with the control sleeve 32, the inner side of the control sleeve 32 is provided with the protruding part 36, the outer side of the shell 31 is also molded with a step part three 316, the step part three 316 is positioned in the control sleeve 32, and a spring three 34 is arranged between the step part three 316 and the protruding part 36.

A clamping portion 314 is arranged in the positioning portion 312, a second groove 315 for arranging the clamp spring 35 is formed in the shell 31, and the connection state between the quick connector 3 and the inflation rod air nozzle 5 can be controlled through the control sleeve 32.

As shown in fig. 7-8-9 and 11, the inflation rod 9 is provided with an inflation rod nozzle 5 for connecting with the air tube assembly 1, the other end of the inflation rod 9 is provided with a hollow inflation joint 91, and the inflation joint 91 is used for connecting with a tire valve so as to ensure that air in the inflation rod 9 can smoothly enter into the tire. A positioning convex part 52 is arranged on the inflating rod air nozzle 5, a trapezoidal groove 53 is formed in the positioning convex part 52, the width of the top end of the trapezoidal groove 53 is larger than the diameter of the second through hole 38, the depth of the trapezoidal groove 53 is not smaller than the length of the radius of the steel ball 39, and a transition area between the positioning convex part 52 and the inserting part 51 is formed into a third inclined surface 54.

When the quick connector 3 is connected to the inflation rod nozzle 5, the inflation rod nozzle 5 pushes the first valve element 41 with the inflation rod nozzle 5 extending into the first valve element, so that the abutting portion 412 no longer blocks the port of the second through hole 38 facing the inner side of the housing 31, and the trapezoidal groove 53 gradually moves along with the inflation rod nozzle 5 until the second through hole 38 is aligned, so that the steel ball 39 has enough space to move towards the inner side of the housing 31.

When the quick-connect joint 3 is in the unconnected state, the top end of the abutting portion 412 abuts against the limiting portion 3121, and the abutting portion 412 blocks the port of the second through hole 38 facing the inner side of the housing 31, at this time, because the inner space of the second through hole 38 is insufficient, the control sleeve 32 needs to be pulled down, so that the steel ball 39 moves to the outer side of the housing 31 and is blocked by the inner wall of the top end of the control sleeve 32. And the bottom end of the boss 36 is pushed by the third spring 34, so that the push inclined plane 37 at the upper end of the boss 36 abuts against the lower end of the steel ball 39, and the upper end of the steel ball 39 abuts against the inner wall of the upper side of the second through hole 38, thereby forming a stable structure.

When the quick connector 3 is connected to the inflation rod nozzle 5, the inflation rod nozzle 5 pushes the first valve core 41, so that the abutting portion 412 no longer blocks the port of the second through hole 38 facing the inside of the housing 31. With the air faucet 5 of the inflation rod extending in, the positioning protrusion 52 is aligned with the second through hole 38, and the pushing inclined surface 37 at the upper end of the step portion three 316 can resolve the vertical force applied by the spring three 34 to the protrusion 36 into a horizontal component force, so as to push the steel ball 39 to move toward the inside of the housing 31. As the projection 36 rises, the push inclined surface 37 pushes the steel ball 39 into the trapezoidal groove 53, the projection 36 blocks the second through hole 38 from leading to one side of the control sleeve 32, so that the steel ball 39 cannot be completely separated from the trapezoidal groove 53, and the inflation rod air nozzle 5 and the docking cavity 413 are fixed.

As shown in fig. 2, the inflation rod air nozzle 5 is screwed on the inflation rod 9, and the inflation rod 9 is connected with the quick connector 3 through the inflation rod air nozzle 5, the inflation rod 9 in this embodiment is a double-head inflation rod 97, and the positions of the chucks on the double-head inflation rod 97 are changed, so that the inflation valves at different positions of the tire can be connected, and the application occasions are wide. The quick-connection clamp on the double-head inflating rod 97 can be used for more firmly connecting the inflating valve of the tire under the condition of ensuring the air tightness, so that an operator does not need to hold the inflating device to fix in the inflating process, and the personal safety of the operator can be guaranteed.

Example two:

as shown in fig. 12, this embodiment is substantially the same as the first embodiment, except that a straight inflation rod 98 is connected to the inflation rod nozzle 5 of this embodiment, and the straight inflation rod 98 can be used as an extension of an arm, so that an operator can connect the joint of the straight inflation rod 98 to a valve nozzle in an area where the arm is difficult to enter.

Example three:

as shown in fig. 13, the present embodiment is substantially the same as the first embodiment, except that the inflation rod nozzle 5 of the present embodiment is connected with a rubber inflation rod 99, and after an operator connects a joint of the rubber inflation rod 99 with a valve, the tire inflation can be controlled by the tire pressure gauge 8 and the pressure release valve 7 at a safe position, so as to avoid injury of the operator due to a tire explosion accident, and greatly protect the personal safety of the operator.

Example four:

as shown in fig. 14 and 15, this embodiment is substantially the same as the second or third embodiment, except that the other end of the inflation rod 9 is connected with an inflation connector 91, and the inflation connector 91 is connected with the inflation rod 9 through an inflation rod connector 92.

The connector on the market now, in order to guarantee to be convenient for connect the inflating valve, steadiness when having reduced and being connected with the inflating valve, some connectors need just can be smooth under the assistance of external force inflate, and this kind of mode is extremely dangerous to the great freight train or truck tire of volume, if the accident that takes place the tire explosion, must lead to the operating personnel casualty.

The pipe orifice of the inflation connector 91 adopted in the embodiment is provided with an internal thread matched with the valve, so that the inflation connector 91 can be screwed on the valve, and the inflation connector 91 is stably connected with the valve. After the connection is completed, the operator is no longer required to be located near the tire at all times to confirm the connection state of the inflation connector 91 with the valve when inflating.

The outer wall of the end of the inflation rod interface 92 inserted into the inflation rod 9 is provided with a sawtooth part 95, one side inclined plane of the sawtooth part 95 inserted into the inflation rod 9 is clockwise tooth, the inflation rod interface 92 cannot be prevented from being inserted into the inflation rod 9, the other side inclined plane of the sawtooth part 95 is anticlockwise tooth, and the sawtooth part is matched with the structure in the inflation rod 9 to prevent the inflation rod interface 92 from falling off from the inflation rod 9.

The other end of the inflation rod interface 92 is connected with the inflation connector 91, the installation cavity 96 is formed in the connecting part 311, and the installation channel is formed in the inflation connector 91.

The core rod 93 penetrates through the inflation connector 91, the core rod 93 comprises an air inlet end 931 and an air outlet end 932, the outer diameter of the air outlet end 932 is matched with the inner diameter of the installation channel, the outer diameter of the air inlet end 931 is matched with the inner diameter of the installation cavity 96, and the outer diameter of the air inlet end 931 is larger than the inner diameter of the installation channel, so that the air inlet end 931 of the core rod 93 is fixed between the installation cavity 96 and the inflation connector 91.

The core rod 93 is internally provided with a third through hole 94, the third through hole 94 close to one end of the pipe orifice of the inflation connector 91 is widened along the radial direction of the core rod 93, and the two ends of the core rod 93 are communicated, so that air flow can flow into the inflation connector 91 from the two sides of the core rod 93.

The above-mentioned embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereto, so: all equivalent changes made according to the structure-shape-principle of the utility model are covered within the protection scope of the utility model.

Claims (10)

1. A tire inflation apparatus, comprising

An air tube assembly (1) for supplying air to a tire; the front end of the air pipe assembly (1) is provided with an inflating rod (9), the rear part of the air pipe assembly (1) is provided with an inner pipe (11), and the surface of the inner pipe (11) is provided with a vent hole (12);

the sleeve (2) is rotatably sleeved on the outer side of the inner pipe (11); the two ends of the sleeve (2) and the inner pipe (11) are sealed, and an air cavity (25) is formed between the sleeve (2) and the inner pipe (11); the vent hole (12) is communicated with the air cavity (25) and a pipeline inside the inner pipe (11);

a tire pressure meter (8) and a pressure release valve (7) are arranged on the side wall of the sleeve (2); the inner ends of the tire pressure meter (8) and the pressure relief valve (7) are respectively communicated with the air cavity (25).

2. A tire inflation apparatus according to claim 1, wherein the inner wall of the middle portion of the casing (2) is thinned by 0.5mm to 1mm to form a widened portion (24), the widened portion (24) and the outer wall of the inner tube (11) form the air chamber (25), and the inner ends of the tire pressure gauge (8) and the pressure relief valve (7) are located inside the air chamber (25).

3. A tire inflator according to claim 1 or 2, wherein the relief valve (7) is provided through a relief valve mounting hole (21) of the casing (2), and the bottom end of the tire pressure gauge (8) is provided through a tire pressure gauge mounting hole (22) of the casing (2);

and a step part II (23) is formed at one end of the pressure relief valve mounting hole (21) positioned on the outer side of the sleeve (2).

4. A tire inflation device according to claim 3, wherein the relief valve (7) comprises a second valve element (71) and a second valve body (72), the second valve body (72) is screwed into the relief valve mounting hole (21), the second valve element (71) is inserted into the second valve body (72), and the second valve element (71) comprises a pressing portion (711) and a ventilation portion (712);

the curved surface of the ventilation part (712) is sunken towards the inner side to form a clamping groove (714), and a second sealing ring (715) is arranged in the clamping groove (714).

5. A tyre inflation device according to claim 1, characterized in that a quick coupling (3) is connected to one end of the air tube assembly (1), said quick coupling (3) being adapted to be connected to 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 air flow to enter the inner pipe (11).

6. A tyre inflation device as claimed in claim 5, characterized in that said quick-coupling (3) comprises

A plurality of second through holes (38) are circumferentially arranged at the pipe orifice of the shell (31);

a check valve (4) which is inserted into the inside of the housing (31) and controls the flow of gas in the housing (31);

the 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 matched with the pipe diameter of the second through hole (38), so that the steel ball (39) can roll in the second through hole (38);

and the control sleeve (32) is sleeved on the outer side of the shell (31) and can control the position of the steel ball (39) in the second through hole (38).

7. A tyre inflation device according to claim 6, characterized in that the one-way valve (4) comprises:

the valve element I (41), wherein the valve element I (41) consists of a control piston (411) and a butt joint part (412), a gas channel (4111) is formed inside the control piston (411), a butt joint cavity (413) is formed inside the butt joint part (412), and the gas channel (4111) is communicated with the butt joint cavity (413);

the outer diameter of the control piston (411) is matched with the inner diameter of the valve body I (42), and the control piston (411) penetrates into the valve body I (42);

a first through hole (4112) is formed in the pipe wall of the control piston (411), and the first through hole (4112) is used for communicating the gas channel (4111) with the interior of the housing (31);

the connecting area between the control piston (411) and the butt joint part (412) is formed into a first stepped part (414), and the outer diameter of the first stepped part (414) is the same as that of the first valve body (42).

8. A tire inflation device according to claim 7, wherein one end of said housing (31) is a connection portion (311), said connection portion (311) being used for said housing (31) to connect to an inflation rod;

the inner wall of the pipe orifice of the shell (31) protrudes inwards to form a positioning part (312), and the second through hole (38) is arranged in the positioning part (312);

a sliding portion (313) located between the connecting portion (311) and the positioning portion (312), the sliding portion (313) being used for the movement of the one-way valve (4) in the housing (31).

9. A tyre inflation device as claimed in claim 6 or 8, characterized in that said inflation rod (9) is provided at one end with an inflation rod nozzle (5) and at the other end with a hollow inflation nipple (91);

the inflating rod (9) is connected with the quick connector (3) through the inflating rod air nozzle (5);

and a trapezoidal groove (53) is formed in the air tap (5) of the inflating rod, and when the trapezoidal groove (53) is aligned with the second through hole (38), the steel ball (39) can enter the trapezoidal groove (53).

10. A tire inflation apparatus as claimed in claim 9, wherein said inflation fitting (91) is connected to said inflation stem (9) by an inflation stem interface (92);

the inflation joint (91) can be screwed on the tire valve;

the outer wall of one end of the inflation rod interface (92) inserted into the inflation rod (9) is provided with a sawtooth part (95);

the other end of the inflation rod interface (92) is connected with the inflation connector (91), and a mounting cavity (96) is formed in the connecting part of the inflation rod interface (92) and the inflation connector (91);

a core rod (93) penetrates through the inflation connector (91);

the core rod (93) comprises an air inlet end (931) and an air outlet end (932), the air outlet end (932) penetrates through the inflation connector (91), and the air inlet end (931) is arranged in the installation cavity (96);

a third through hole (94) is formed in the core rod (93), the third through hole (94) close to one end of the pipe orifice of the inflation connector (91) is widened along the radial direction of the core rod (93), and two ends of the core rod (93) are communicated.

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