CN117267599B - Precise fuel aerosol can - Google Patents

Abstract

The invention discloses a precise fuel aerosol can, which relates to the technical field of aerosol cans, and comprises a can body and an upper cover which are mutually sealed and installed, wherein an injection valve is also installed in the upper cover, and the precise fuel aerosol can further comprises: an inner body arranged in the upper cover, wherein a pressure release cavity is formed in the inner body; the pressure release pipeline enables the gas in the tank body to be unidirectionally introduced into the pressure release cavity when the gas pressure in the tank body exceeds a preset value, and enables the pressure release cavity to be balanced with the gas pressure in the tank body; and the backflow assembly is arranged in the inner assembly, and when the air pressure in the pressure relief cavity is larger than the tank body and the pressure difference between the pressure relief cavity and the tank body exceeds a preset value, the backflow assembly enables the pressure relief cavity to be communicated with the tank body, and the air flows back into the tank body to be subjected to pressure compensation. According to the invention, the pressure release cavity is communicated with the tank body through the backflow component, and the gas in the pressure release cavity flows back into the tank body again under the action of pressure difference, so that the purpose of pressure supplementing is achieved for the tank body, the product in the tank body can be ensured to be completely sprayed out for use, the waste of the product is avoided, and the utilization rate is improved.

Description

Precise fuel aerosol can

Technical Field

The invention relates to the technical field of aerosol cans, in particular to a precise fuel aerosol can.

Background

An aerosol can is a can capable of storing fuel, and is a complete pressure packaging container which is generally composed of a spray head, a valve, a can body and contents (including products, propellants and the like), wherein when the valve is opened, the contents are released in a controlled manner under a preset pressure, so that the spray head sprays atomized materials, and the aerosol can work.

As disclosed in chinese patent publication No. CN114811403B, this fuel aerosol can is through setting up built-in elastic air bag, when pressure exceeded the predetermined value, the piston plate moved up to the top of air inlet for the inside partial gas of jar body gets into inside the elastic air bag from first passageway, can carry out self-decompression to jar body inside, not only can avoid appearing revealing the condition to jar body outside, can guarantee moreover that jar body inside pressure can not overload, avoids appearing circumstances such as explosion.

However, although the fuel aerosol can be depressurized in the can body by self, the depressurized gas can be used up along with each use, so that insufficient gas pressure in the can body can be generated at the last time, and the product in the can body can not be fully used up to cause waste, or the spraying use is influenced by insufficient gas pressure at the last time.

Disclosure of Invention

The invention aims to provide a precise fuel aerosol can, which solves at least one technical problem existing in the prior art.

In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a precision type fuel aerosol jar, includes the body and the upper cover of mutual sealing installation, still install the injection valve in the upper cover, still include:

an inner body arranged in the upper cover, wherein a pressure release cavity is formed in the inner body;

The pressure release pipeline enables the gas in the tank body to be unidirectionally introduced into the pressure release cavity when the gas pressure in the tank body exceeds a preset value, and enables the pressure release cavity to be balanced with the gas pressure in the tank body;

and the backflow assembly is arranged in the inner assembly, and when the air pressure in the pressure relief cavity is larger than the tank body and the pressure difference between the pressure relief cavity and the tank body exceeds a preset value, the backflow assembly enables the pressure relief cavity to be communicated with the tank body, and the air flows back into the tank body to be subjected to pressure compensation.

Preferably, the injection valve comprises a pressing valve installed at the bottom of the inner body, the bottom of the pressing valve is connected with a hose, the center of the inner body is provided with an installation cavity, a pressing button is slidably installed in the installation cavity, the pressing button is communicated with the pressing valve through a pipeline, a spring is installed between the pressing button and the inner bottom of the installation cavity, and when the pressing valve Niu Anya is pressed, the pressing valve is opened and products in the tank body are ejected from an ejection opening on the pressing button.

Preferably, the reflux assembly comprises a circular groove which is arranged in the upper cover and is communicated with the mounting cavity, a rotary cake is rotationally arranged in the circular groove, an upper channel and a lower channel are respectively arranged in the upper cover at the upper side and the lower side of the rotary cake, the upper channel is communicated with the pressure release cavity, the lower channel is communicated with the tank body, the upper channel and the lower channel are both positioned in the diameter direction of the rotary cake, and a communication hole is formed in the rotary cake along the diameter direction;

The backflow assembly further comprises a driving assembly, when the air pressure in the tank body is in a normal use state, the communication hole is staggered with the upper channel and the lower channel, and when the pressure difference between the pressure release cavity and the tank body exceeds a preset value, the driving assembly drives the rotary cake to rotate and enables the upper channel and the lower channel to be communicated.

Preferably, the assembly is driven including seting up at the inside mounting hole along the diameter direction of cake that rotates, still including seting up at the inside vertical hole along the diameter direction of cake that rotates, just vertical hole sets up with the mounting hole is perpendicular, the inside slidable mounting in vertical hole has the round bar, just the round bar is established to the round end towards the one end of mounting hole, is close to the mounting hole inner wall slidable mounting of pressure release chamber has an upward slide nail, upward slide nail is established to the one end towards the round bar to be cone, is close to the mounting hole inner wall slidable mounting of jar body has a down slide nail, down slide nail is fixed with the nail pole towards the one end of upward slide nail, the inner wall of mounting hole still installs the spout slider structure that is used for carrying out spacing to the down slide nail, just the top of nail pole is the axis position of round bar the highest.

Preferably, the one end that the mounting hole was kept away from to the round bar has pegged graft and has flexible head, just it has the elastic component to fill between round bar and the flexible head, flexible head stretches into the installation cavity tip and is equipped with the cambered surface, just press the bottom corner of button also to be equipped with the fillet that corresponds.

Preferably, the pressure relief pipeline comprises a groove formed in the bottom of the inner body, a pressure relief pipe communicated with the pressure relief cavity is arranged in the groove, a first one-way valve for enabling gas to enter the pressure relief cavity in a one-way mode is arranged in the pressure relief pipe, and a pressure relief opening is formed in the outer wall of the pressure relief pipe;

the pressure relief pipeline further comprises a baffle ring which is slidably arranged in the groove, the pressure relief opening is sleeved on the pressure relief pipe to seal the pressure relief opening, and the pressure relief pipe and the baffle ring are fixed through shear pins.

Preferably, the elastic element is provided as an elastic layer or as a spring element.

Preferably, the inner body is composed of two mutually combinable half-round bodies.

Preferably, the pressure relief pipeline is including seting up the inside intercommunication passageway that makes pressure relief cavity and the body intercommunication of dress body, the internally mounted of intercommunication passageway has the second check valve that makes the one-way pressure relief intracavity that gets into of gas, the inside of intercommunication passageway still inlays and is equipped with the sealing ball that is used for blocking, just the movable chamber that can supply the sealing ball activity has still been seted up to the inside of intercommunication passageway, works as when the body internal pressure exceeds the default, under the atmospheric pressure effect, the sealing ball is extruded into the movable intracavity.

Preferably, the inner diameter of the movable cavity is larger than the diameter of the sealing ball.

Compared with the prior art, the invention has the following beneficial effects:

When the aerosol can is influenced by the outside, the pressure in the can body can not be overloaded in a pressure relief mode, so that explosion conditions are avoided, and meanwhile, the gas can be transferred and stored;

and along with the use of aerosol canister, inside gas and the reduction of product, the backward flow subassembly can make pressure release chamber and body intercommunication, and the gaseous back flow in the pressure release chamber is in the body under the effect of pressure differential, plays the purpose of pressure supplementing to the body to guarantee that the product in the body can spout completely and use, avoided the waste of product, improve the rate of utilization.

Drawings

FIG. 1 is a perspective view of an aerosol canister of the present invention;

FIG. 2 is a cross-sectional view and a partial enlarged view of the aerosol canister of the present invention;

FIG. 3 is a cut-away perspective view of the view of FIG. 2 of the present invention;

FIG. 4 is an enlarged view of the rotary cake of the present invention;

FIG. 5 is a schematic view of the rotary cake and the push button of the present invention in a normal state;

FIG. 6 is a schematic view showing a state of the rotary cake and the pressing button in the present invention in a return state;

FIG. 7 is an enlarged perspective view of the rotary cake of the present invention;

FIG. 8 is a schematic perspective view of an inner body of the present invention;

fig. 9 is a schematic cross-sectional view of a pressure relief pipeline in a second embodiment of the present invention.

In the figure: 1. a can body; 2. an upper cover; 3. pressing the button; 4. a protective cover; 5. an inner body; 6. a pressure relief cavity; 7. pressing the valve; 8. a hose; 9. a pressure relief tube; 10. a mounting cavity; 11. a first one-way valve; 12. a pressure relief port; 13. a baffle ring; 14. shearing nails; 15. an upper channel; 16. a lower channel; 17. rotating the cake; 18. a mounting hole; 19. a vertical hole; 20. a slide nail is arranged; 21. a lower slide nail; 22. nailing the rod; 23. a round bar; 24. a retractable head; 25. an elastic member; 26. a communication hole; 27. a communication passage; 28. a sealing ball; 29. a second one-way valve; 30. a movable chamber.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Embodiment one:

referring to fig. 1 to 8, the present invention provides a technical solution: the utility model provides a precision type fuel aerosol jar, includes the jar body 1 and upper cover 2 of mutual sealing installation, still installs the injection valve in the upper cover 2, still includes:

An inner body 5 arranged in the upper cover 2, and a pressure release cavity 6 is arranged in the inner body 5;

The pressure relief pipeline enables the gas in the tank body 1 to be unidirectionally introduced into the pressure relief cavity 6 when the air pressure in the tank body 1 exceeds a preset value, and enables the pressure relief cavity 6 to be balanced with the air pressure in the tank body 1;

And the backflow component is arranged in the inner assembly 5, and when the air pressure in the pressure release cavity 6 is larger than the tank body 1 and the pressure difference between the pressure release cavity and the tank body 1 exceeds a preset value, the backflow component enables the pressure release cavity 6 to be communicated with the tank body 1, so that the air flows back into the tank body 1 for pressure compensation.

In the normal use process of the aerosol can, the pressure release cavity 6 is kept in a normal pressure or negative pressure state so as to facilitate the gas in an abnormal state to enter;

when the aerosol can is influenced by external environment, such as over-temperature and over-pressure, or the internal pressure is increased and exceeds a preset value under the factors of external impact and the like, the pressure release pipeline can enable the gas (propellant) in the can body 1 to be unidirectionally introduced into the pressure release cavity 6 until the air pressure in the pressure release cavity 6 is balanced with the air pressure in the can body 1, so that the aim of releasing the pressure in the aerosol can is achieved, the pressure in the can body 1 is not overloaded, explosion is avoided, and meanwhile, the gas can be transferred and stored;

Then along with the use of aerosol canister, inside gaseous and the reduction of product, because in some gaseous transfer to pressure release chamber 6 in the body 1, consequently the atmospheric pressure in the body 1 can be insufficient gradually, even can not spout the product completely, the backward flow subassembly makes pressure release chamber 6 and body 1 intercommunication this moment, gaseous in the pressure release chamber 6 flows back again in the body 1 under the effect of pressure differential, play the purpose of pressure supplementing to body 1, in order to guarantee that the product in the body 1 can spout the use completely, avoided the waste of product, the improvement rate of utilization.

In one of the preferred embodiments, the injection valve comprises a pressing valve 7 mounted at the bottom of the inner body 5, the bottom of the pressing valve 7 is connected with a hose 8, the center of the inner body 5 is provided with a mounting cavity 10, the pressing button 3 is slidably mounted in the mounting cavity 10, the pressing button 3 is communicated with the pressing valve 7 through a pipeline, a spring is mounted between the pressing button 3 and the inner bottom of the mounting cavity 10, and when the pressing button 3 is pressed, the pressing valve 7 is opened and the product in the can body 1 is injected from an injection port on the pressing button 3.

The injection valve specifically can refer to fig. 2, when in use, the pressing button 3 is directly pressed by a finger, then the pressing button 3 can open the pressing valve 7 through a pipeline, under the pressure effect in the tank body 1, internal products are sprayed out from the hose 8 and the spraying port on the pressing button 3, then after the pressing button 3 is released, the pressing button 3 automatically resets, and meanwhile, the pressing valve 7 is automatically closed, so that the process of spraying once is completed.

In one preferred embodiment, the reflux assembly comprises a circular groove which is arranged in the upper cover 2 and is communicated with the installation cavity 10, a rotary cake 17 is rotationally installed in the circular groove, an upper channel 15 and a lower channel 16 are respectively arranged in the upper cover 2 which is positioned on the upper side and the lower side of the rotary cake 17, the upper channel 15 is communicated with the pressure release cavity 6, the lower channel 16 is communicated with the tank body 1, the upper channel 15 and the lower channel 16 are both positioned in the diameter direction of the rotary cake 17, and a communication hole 26 is formed in the rotary cake 17 along the diameter direction;

The backflow assembly further comprises an actuating assembly, when the air pressure in the tank body 1 is in a normal use state, the communication hole 26, the upper channel 15 and the lower channel 16 are staggered, and when the pressure difference between the pressure release cavity 6 and the tank body 1 exceeds a preset value, the actuating assembly drives the rotary cake 17 to rotate and enables the upper channel 15 and the lower channel 16 to be communicated.

Under normal use conditions, the assembly is driven to cause the communication hole 26, the upper channel 15 and the lower channel 16 to be staggered with each other, so that the pressure release cavity 6 is separated from the tank body 1;

And with the use, after the atmospheric pressure in the jar body 1 is in the gradual reduction, when pressure differential between pressure release chamber 6 and jar body 1 exceeds the default, drive the subassembly and drive the rotation cake 17 and rotate this moment, make the intercommunicating pore 26 communicate upper passageway 15 and lower passageway 16 to make the gaseous back in the pressure release chamber 6 in jar body 1 carry out the pressure filling again, reach the effect that the gaseous backward flow was filled up.

In one preferred embodiment, the driving assembly comprises a mounting hole 18 formed in the rotary cake 17 and along the diameter direction, a vertical hole 19 formed in the rotary cake 17 and along the diameter direction, the vertical hole 19 is perpendicular to the mounting hole 18, a round rod 23 is slidably mounted in the vertical hole 19, one end of the round rod 23, which faces the mounting hole 18, is provided with a round end, an upper slide nail 20 is slidably mounted on the inner wall of the mounting hole 18, which is close to the pressure release cavity 6, one end, which faces the round rod 23, is provided with a taper shape, a lower slide nail 21 is slidably mounted on the inner wall of the mounting hole 18, which is close to the tank body 1, a nail rod 22 is fixed on one end, which faces the upper slide nail 20, of the inner wall of the mounting hole 18 is further provided with a slide groove slide block structure for limiting the lower slide nail 21, and the top end of the nail rod 22 is the axis position of the round rod 23.

As can be seen from the foregoing, in the normal state, the communication hole 26 is staggered from the upper and lower channels, while the vertical hole 19 in the rotary cake 17 is in the horizontal state, i.e. as shown in fig. 5, while the lower slide nail 21 is in the uppermost state under the action of the internal pressure of the can body 1, and the top end of the nail rod 22 is located at the axial position of the round rod 23 and abuts against the bottom end of the upper slide nail 20 under the limit action of the chute slide block structure;

At this time, when the pressing button 3 is pressed down, the air pressure in the installation cavity 10 becomes large, so that the round rod 23 can retract into the vertical hole 19, and when the air pressure contacts and abuts against the conical surface of the round rod 23, the pressing button 3 cannot contact with the round rod 23 when moving down, so that the normal use of the pressing button 3 is ensured;

In the normal state, because the pressure release cavity 6 is in a normal pressure or negative pressure state, when the round rod 23 contacts the upper slide nail 20, a part of the round rod 23 can possibly move upwards against the upper slide nail 20 until the round head part of the round rod 23 contacts the nail rod 22;

similarly, when an abnormal situation occurs, that is, after the internal pressure relief process is completed, the air pressure in the tank body 1 and the pressure relief cavity 6 is balanced, at this time, when the pressing button 3 is pressed downwards, the round rod 23 contacts the conical surface of the upper slide nail 20 in the retracting process, and cannot move continuously against the upper slide nail 20, which is equivalent to reducing a displacement distance, and referring to fig. 5, at this time, the pressing button 3 still cannot contact the round rod 23 when being pressed downwards;

With the use of the aerosol can, the pressure in the can body 1 is gradually reduced, while the pressure in the pressure release cavity 6 is kept unchanged, so that the upper slide nail 20 gradually moves downwards and pushes the lower slide nail 21 downwards along with the nail rod 22, and with the downward movement of the upper slide nail 20, the conical surface part of the upper slide nail also moves downwards, correspondingly, the retraction distance of the round rod 23 is reduced, as shown in fig. 6, when the conical surface of the upper slide nail 20 passes through the vertical hole 19, the round rod 23 can only be abutted against the cambered surface of the round rod 23, that is, when the pressing button 3 moves downwards, the round rod 23 is touched, and the rotary cake 17 is driven to rotate by the round rod 23, so that the communication hole 26 communicates the upper channel 15 with the lower channel 16, and the purpose of gas communication reflux is achieved in the pressing use process.

In one preferred embodiment, a telescopic head 24 is inserted into one end of the round rod 23 far away from the mounting hole 18, an elastic piece 25 is filled between the round rod 23 and the telescopic head 24, an arc surface is arranged at the end of the telescopic head 24 extending into the mounting cavity 10, and a corresponding round corner is also arranged at the bottom corner of the pressing button 3.

As can be seen from the above, in the normal state, after the round bar 23 is retracted and contacted with the conical surface of the upper slide 20, it can also move up against the upper slide 20 until contacting with the nail bar 22, and the moving distance of the round bar 23 is changed by a range a compared with the case of abnormality, as shown in fig. 5;

Thus, by setting the telescopic head 24 and the elastic element 25, the moving distance of the round rod 23 includes the range of a in the normal state, at this time, the pressing button 3 will not contact the telescopic head 24 when being pressed down, and when abnormal conditions occur, the round rod 23 cannot move continuously after contacting the conical surface of the upper slide nail 20, that is, the moving distance is reduced by the range of a, at this time, the pressing button 3 will contact the cambered surface of the telescopic head 24 when being pressed down and be pressed inwards, at this time, the telescopic head 24 will not affect the pressing of the pressing button 3, but the telescopic head 24 will apply a point touch to the pressing button 3, so that a section sense will be provided when a user presses down, thereby reminding the user that the aerosol can has an internal pressure release state, and achieving the purposes of reminding and warning.

And when the round angle of the pressing button 3 directly contacts with the side surface of the telescopic head 24 in the pressing process, the rotary cake 17 is driven to rotate by the round angle, so that the backflow pressure supplementing process is not influenced.

It should be noted that when the user feels a feeling of a paragraph during the pressing process, the use of the aerosol can be stopped and the aerosol can is placed for a period of time, if the aerosol can is subjected to external impact or other physical factors to perform pressure relief, then the aerosol can possibly has a gas leakage phenomenon, after the aerosol can is placed for a period of time, if the can body 1 has a gas leakage phenomenon, the gas pressure of the can body 1 is reduced, so that a gas pressure difference is formed between the pressure relief cavity 6 and the can body 1, and when the gas pressure difference exceeds a preset value, the gas pressure difference is the same as the backflow state, namely, when the pressing button 3 is pressed again, the round rod 23 can form a blocking for the pressing button 3, and is not the paragraph feeling of the telescopic head 24, at this time, the user can be reminded that the can body 1 has a breakage or a phenomenon, and the user needs to perform timely treatment or replacement to prevent accidents;

In summary, when the user feels that the pressing has the paragraph sense, the aerosol can is used after being placed for a period of time, if the paragraph sense is still only, the can body 1 is indicated to be complete and good, and if the pressing is not performed, the can body 1 is indicated to be possibly air leakage, the air leakage phenomenon needs to be treated in time, the effect of self-checking the can body is achieved, and the safety performance is higher.

Preferably, in order to increase the blocking degree of the round bar 23 on the pressing button 3, so that the pressing button is obviously distinguished from the paragraph sense brought by the telescopic head 24, the force required to press the pressing button 3 can be increased by increasing the rotation force of the rotary cake 17, so as to further distinguish.

In one preferred embodiment, the pressure relief pipeline comprises a groove formed in the bottom of the inner body 5, a pressure relief pipe 9 communicated with the pressure relief cavity 6 is arranged in the groove, a first one-way valve 11 for enabling gas to enter the pressure relief cavity 6 in a one-way is arranged in the pressure relief pipe 9, and a pressure relief opening 12 is formed in the outer wall of the pressure relief pipe 9;

The pressure release pipeline further comprises a baffle ring 13 which is slidably arranged in the groove, the pressure release opening 12 is sleeved on the pressure release pipe 9 to seal the pressure release opening 12, and the pressure release pipe 9 and the baffle ring 13 are fixed through shear pins 14.

Referring specifically to the enlarged portion of fig. 2, when an abnormal situation occurs, the air pressure in the can body 1 increases, pushing the retainer ring 13 to slide in the groove, and making it snap the shear pin 14, releasing the restriction of the retainer ring 13, then the retainer ring 13 will slide in the groove, and opening the pressure release opening 12, and the air in the can body 1 can enter the pressure release cavity 6 in one direction through the pressure release pipe 9, thus completing the pressure release process in the can.

Meanwhile, the baffle ring 13 loses the limit function, and the common aerosol can is shaken before being used, so that the baffle ring 13 can fall into the can body 1 in the shaking process, and the purpose of reminding a user can be achieved through the inside ringing of the baffle ring.

In one of the preferred embodiments, the elastic member 25 is provided as an elastic layer or a spring member.

The elastic member 25 may be an elastic layer such as elastic cotton or sponge, or an elastic member such as a spring member that can be elastically restored.

In one preferred embodiment, the inner body 5 is composed of two mutually combinable half-round bodies.

Referring to fig. 8, by dividing the inner body 5 into two semi-circular bodies which are butted with each other, the installation of the inner structure and the installation in the upper cover 2 can be facilitated, and the protective cover 4 which is matched with the upper cover 2 is also included.

The second embodiment is substantially the same as the first embodiment, except that a second embodiment of the pressure relief line is provided, see in particular fig. 9;

The pressure relief pipeline comprises a communication channel 27 which is arranged in the inner body 5 and is used for enabling the pressure relief cavity 6 to be communicated with the tank body 1, a second one-way valve 29 which enables gas to enter the pressure relief cavity 6 in a one-way mode is arranged in the communication channel 27, a sealing ball 28 used for blocking is embedded in the communication channel 27, a movable cavity 30 which can be used for enabling the sealing ball 28 to move is further arranged in the communication channel 27, and when the pressure in the tank body 1 exceeds a preset value, the sealing ball 28 is extruded into the movable cavity 30 under the action of air pressure.

Under normal use condition, the sealing ball 28 cuts off the communication channel 27, when the air pressure in the tank body 1 exceeds the preset value, the sealing ball 28 is extruded into the movable cavity 30 under the action of the pressure to communicate the communication channel 27, and even the sealing ball 28 can be directly crushed, the purpose of communication can be achieved.

In one of the preferred embodiments, the inner diameter of the movable chamber 30 is greater than the diameter of the sealing ball 28.

The standard components used in the present embodiment may be purchased directly from the market, and the nonstandard structural components according to the descriptions of the specification and the drawings may also be obtained directly by unambiguous processing according to the common general knowledge in the prior art, and meanwhile, the connection manner of each component adopts the conventional means mature in the prior art, and the machinery, the components and the equipment all adopt the conventional types in the prior art, so that the specific description will not be made here.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (6)

1. The utility model provides a precision type fuel aerosol jar, includes jar body (1) and upper cover (2) of mutual sealing installation, still install the injection valve in upper cover (2), its characterized in that still includes:

An inner body (5) arranged in the upper cover (2), wherein a pressure release cavity (6) is formed in the inner body (5);

The pressure relief pipeline enables the gas in the tank body (1) to be unidirectionally introduced into the pressure relief cavity (6) when the air pressure in the tank body (1) exceeds a preset value, and enables the pressure relief cavity (6) to be balanced with the air pressure in the tank body (1);

the backflow assembly is arranged in the inner assembly (5), and when the air pressure in the pressure release cavity (6) is larger than the tank body (1) and the pressure difference between the pressure release cavity and the tank body (1) exceeds a preset value, the backflow assembly enables the pressure release cavity (6) to be communicated with the tank body (1) and enables air to flow back into the tank body (1) for pressure compensation;

The injection valve comprises a pressing valve (7) arranged at the bottom of the inner body (5), a hose (8) is connected to the bottom of the pressing valve (7), a mounting cavity (10) is arranged in the center of the inner body (5), a pressing button (3) is slidably arranged in the mounting cavity (10), the pressing button (3) is communicated with the pressing valve (7) through a pipeline, a spring is arranged between the pressing button (3) and the inner bottom of the mounting cavity (10), and when the pressing button (3) is pressed, the pressing valve (7) is opened to enable products in the tank body (1) to be sprayed out from an injection port on the pressing button (3);

The backflow assembly comprises a circular groove which is formed in the upper cover (2) and is communicated with the installation cavity (10), a rotary cake (17) is rotationally installed in the circular groove, an upper channel (15) and a lower channel (16) are respectively formed in the upper cover (2) on the upper side and the lower side of the rotary cake (17), the upper channel (15) is communicated with the pressure release cavity (6), the lower channel (16) is communicated with the tank body (1), the upper channel (15) and the lower channel (16) are both positioned in the diameter direction of the rotary cake (17), and a communication hole (26) is formed in the rotary cake (17) along the diameter direction;

The backflow assembly further comprises a driving assembly, when the air pressure in the tank body (1) is in a normal use state, the communication hole (26) is staggered with the upper channel (15) and the lower channel (16), and when the pressure difference between the pressure release cavity (6) and the tank body (1) exceeds a preset value, the driving assembly drives the rotary cake (17) to rotate and enables the upper channel (15) to be communicated with the lower channel (16);

The driving assembly comprises a mounting hole (18) which is formed in the rotary cake (17) and along the diameter direction, and further comprises a vertical hole (19) which is formed in the rotary cake (17) and along the diameter direction, the vertical hole (19) is perpendicular to the mounting hole (18), a round rod (23) is slidably mounted in the vertical hole (19), one end of the round rod (23) facing the mounting hole (18) is provided with a round end, an upper slide nail (20) is slidably mounted on the inner wall of the mounting hole (18) close to the pressure release cavity (6), one end of the upper slide nail (20) facing the round rod (23) is provided with a taper shape, a lower slide nail (21) is slidably mounted on the inner wall of the mounting hole (18) close to the tank body (1), a nail rod (22) is fixed on one end of the lower slide nail (21) facing the upper slide nail (20), the inner wall of the mounting hole (18) is further provided with a chute slide block structure for limiting the lower slide nail (21), and the top end of the nail rod (22) is the highest at the axis of the round rod (23);

The pressure relief pipeline comprises a groove formed in the bottom of the inner body (5), a pressure relief pipe (9) communicated with the pressure relief cavity (6) is arranged in the groove, a first one-way valve (11) for enabling gas to enter the pressure relief cavity (6) in a one-way mode is arranged in the pressure relief pipe (9), and a pressure relief opening (12) is formed in the outer wall of the pressure relief pipe (9);

the pressure relief pipeline further comprises a baffle ring (13) which is slidably arranged in the groove, the pressure relief opening (12) is sleeved on the pressure relief pipe (9) to seal the pressure relief opening (12), and the pressure relief pipe (9) and the baffle ring (13) are fixed through shear pins (14).

2. The precision fuel aerosol canister of claim 1, wherein: the one end that mounting hole (18) was kept away from to round bar (23) is pegged graft has flexible head (24), just pack between round bar (23) and flexible head (24) has elastic component (25), flexible head (24) stretch into mounting chamber (10) tip and are equipped with the cambered surface, just the bottom corner of pressing button (3) also is equipped with corresponding fillet.

3. The precision fuel aerosol canister of claim 2, wherein: the elastic element (25) is designed as an elastic layer or as a spring element.

4. A precision fuel aerosol canister according to any one of claims 1 to 3, wherein: the inner body (5) is composed of two semi-circular bodies which can be mutually combined and spliced.

5. The precision fuel aerosol canister of claim 1, wherein: the pressure relief pipeline is including seting up inside communication channel (27) that makes pressure release chamber (6) and jar body (1) intercommunication of internal body (5), the internally mounted of communication channel (27) has second check valve (29) that make the one-way entering pressure release chamber (6) of gas, the inside of communication channel (27) still inlays and is equipped with sealing ball (28) that are used for blocking, just movable chamber (30) that can supply sealing ball (28) activity have still been seted up to the inside of communication channel (27), works as when the internal pressure of jar body (1) exceeds the default, under the atmospheric pressure effect, sealing ball (28) are extruded in movable chamber (30).

6. The precision fuel aerosol canister of claim 5, wherein: the inner diameter of the movable cavity (30) is larger than the diameter of the sealing ball (28).