CN220791398U - Air nozzle - Google Patents

Abstract

The utility model discloses an air nozzle, which comprises a shell, a coil assembly, a hollow tube, a limiting core rod, a spring, a sliding column, a valve seat and a spray head, wherein the hollow tube is arranged on the shell; a guide groove is formed on the right side inside the shell, and an air inlet hole which is directly communicated with the guide groove is formed on the right side of the outer wall of the shell; the left side of the guide groove is provided with the hollow pipe, the right end of the guide groove is provided with a right end opening communicated with the outside of the shell, the valve seat is fixedly connected to the right end opening, and the middle part of the valve seat is provided with an air passing hole penetrating through the left end and the right end; the sliding column is arranged in the guide groove in a left-right reciprocating sliding way and comprises a sliding column main body and a sliding column head convexly arranged on the right side of the sliding column main body, the outer diameter of the sliding column main body is equal to the inner diameter of the guide groove, the outer diameter of the sliding column head is smaller than the inner diameter of the guide groove, and the right end face of the sliding column head is movably clung to the left end face of the valve seat; the spray head is arranged on the right side of the shell and communicated with the opening at the right end. The sliding column is arranged to ensure smooth air injection, so that the product can run stably and reliably.

Description

Air nozzle

Technical Field

The utility model relates to the technical field of fuel systems, in particular to an air nozzle.

Background

In order to reduce and replace the limited petroleum resource consumption, the pollution caused by the emission of automobiles is continuously reduced, and the gas fuel for automobiles is adopted and developed in all countries of the world, wherein the most important are Compressed Natural Gas (CNG), liquefied Petroleum Gas (LPG) and hydrogen (H2). At present, the natural gas engine technology generally calculates the injection quantity of natural gas by controlling the injection time of the air nozzles, and the natural gas is converged into a natural gas main pipe through a plurality of air nozzles, then enters an engine air inlet pipe to be mixed with air, and finally enters a cylinder to be combusted.

For example, in the existing air nozzle shown in fig. 1, a valve plate 1' is adopted to perform normally closed operation on a valve seat 2', specifically, the valve plate 1' is in sliding fit in a positioning ring 3' on one side of the valve seat 2', meanwhile, a spring 4' is arranged on one side, away from the valve seat 2', of the valve plate 1', and the valve plate 1' is normally closed on the valve seat 2' by using the spring 4 '; when the coil 5 'is electrified, the control valve plate 1' jumps up in the positioning ring 3 'to form a gap with the valve seat 2', so that gas can flow from the valve plate air passing hole 11 'to the valve seat through hole 21' through the gap, and the jet injection operation is completed. However, the valve plate 1' of the structure is thinner, and when the valve plate 1' is lifted, slight inclination can interfere with the inner wall of the positioning ring 3', so that falling back occurs in the lifting process, and normal air injection cannot be performed; because the contact area of the valve plate 1 'and the valve seat 2' is large (the area with the diameter of about 10 mm), in the area with lower temperature in winter, the valve plate 1 'and the valve seat 2' are easily mutually frozen into a whole due to air with water vapor, so that the valve plate 1 'cannot jump and cannot be separated from the valve seat 2', the injection fails, and the air cannot be smoothly admitted.

In view of the above, the present utility model proposes an air nozzle to solve the above-mentioned problems.

Disclosure of utility model

The utility model aims to provide an air nozzle which has the advantage of stable and reliable air injection.

In order to achieve the above object, the solution of the present utility model is:

An air nozzle comprises a shell, a coil assembly, a hollow tube, a limiting core rod, a spring, a sliding column, a valve seat and a spray head;

The coil assembly comprises a coil framework arranged in the shell, a coil wound between the coil framework and the shell, and a socket arranged at the left end of the shell and electrically connected with the coil;

The hollow tube, the sliding column and the valve seat are sequentially penetrated in the shell from left to right and are coaxial with the central axis of the coil framework;

A guide groove is formed on the right side inside the shell, and an air inlet hole which is directly communicated with the guide groove is formed on the right side of the outer wall of the shell;

The left side of the guide groove is provided with the hollow pipe, the right end of the guide groove is provided with a right end opening communicated with the outside of the shell, the valve seat is fixedly connected to the right end opening, and the middle part of the valve seat is provided with an air passing hole penetrating through the left end and the right end;

The sliding column can slide left and right in the guide groove in a reciprocating manner, and an elastic piece is arranged between the sliding column and the left hollow pipe; the sliding column comprises a sliding column main body and a sliding column head which is convexly arranged on the right side of the sliding column main body, the outer diameter of the sliding column main body is equal to the inner diameter of the guide groove, the outer diameter of the sliding column head is smaller than the inner diameter of the guide groove, and the right end face of the sliding column head is movably clung to the left end face of the valve seat;

The spray head is arranged on the right side of the shell and communicated with the opening at the right end.

Further, the middle part of the right end face of the sliding column head is provided with a concave surface, an elastic sealing gasket is arranged in the concave surface, the middle part of the valve seat corresponding to the concave surface is concavely provided with a concave area, the concave area is internally provided with the air passing hole, and the air passing hole is movably blocked by the sealing gasket.

Furthermore, the number of the air passing holes is several, the air passing holes are uniformly distributed at intervals in the circumferential direction around the center of the valve seat, and meanwhile, the left end face of the valve seat is respectively provided with a circle of sealing bulges at the inner side and the outer side of each air passing hole along the radial direction of the valve seat, and the sealing bulges are bulge structures protruding out of the left end face of the valve seat; the sealing gasket is mutually abutted with the sealing bulge; the outer side of the concave surface forms a circle of annular limiting surface, and the outer side of the concave area corresponding to the annular limiting surface is an annular abutting surface.

Further, the air passing hole of the valve seat is arranged in the center of the concave area in the middle of the valve seat; the left end face of the valve seat is provided with a circle of sealing bulges at the periphery of the air passing hole, and the sealing bulges are bulge structures protruding out of the left end face of the valve seat; the sealing gasket is mutually abutted with the sealing bulge; the outer side of the concave surface forms a circle of annular limiting surface, and the outer side of the concave area corresponding to the annular limiting surface is an annular abutting surface.

Further, a first cavity communication concave surface is formed in the sliding column head of the sliding column, a circle of communication area is formed in the peripheral wall of the sliding column head in a concave mode, and the communication area is located on the air inlet hole; at least one communication hole is arranged in the communication area and is used for communicating the first cavity and the guide groove; the sealing gasket is annular, and the annular middle hole of the sealing gasket is communicated with the first cavity.

Further, the sliding column main body is internally provided with a second cavity communicated with the left end of the sliding column and the first cavity of the sliding column head; the hollow pipe is fixedly connected to the left side inside the shell, and a limiting core rod is arranged in the hollow pipe; the elastic piece is a spring, and the spring is positioned between the sliding column and the limiting core rod; the end of the spring is positioned in the second cavity in a penetrating way.

Further, a circle of groove is formed in the middle of the peripheral wall of the sliding column main body.

Further, the shell comprises a left shell and a right shell which are combined left and right; the left end cover of the left shell is arranged at the periphery of the left end of the right shell, the coil framework and the coil are positioned in the left shell, a coil gland is arranged between the socket and the left shell to fix the left side of the coil fixing, the left end of the right shell is provided with a convex column and extends into the right end of the left shell, and sealant is arranged between the left end of the right shell and the right side of the coil framework.

Further, the hollow tube is arranged in the left shell in a penetrating manner and positioned in the middle of the coil framework; the guide way is arranged inside the right shell and penetrates through the left end and the right end of the right shell, the sliding column and the valve seat are both positioned inside the right shell, and the air inlet hole is formed in the right shell.

Further, three air inlets are circumferentially arranged on the peripheral wall of the right shell at intervals; and a filter screen is arranged at the outer side of each air inlet. After the technical scheme is adopted, the sliding column is enabled to slide in the guide groove to extrude the elastic piece to be separated from the valve seat under the action of magnetic force generated after the coil is electrified by the sliding column, and the air inlet and the air passing hole can be conducted after the right end face of the sliding column head is separated from the left end face of the valve seat to generate a gap due to the fact that the outer diameter of the sliding column head is smaller than the inner diameter of the guide groove, so that natural gas can quickly enter the guide groove from the right side of the shell and then enter the spray head through the air holes to be sprayed out of the spray head. And after the coil is powered off, the sliding column presses the valve seat again under the action of the spring to seal the air passing hole. The sliding column is arranged, so that the sliding column can avoid interference and fall back, smooth air injection is ensured, and the product can run stably and reliably.

Drawings

FIG. 1 is a schematic cross-sectional view of a prior art air nozzle;

FIG. 2 is a cross-sectional view of example 1 of the present utility model;

FIG. 3 is a perspective view of a strut of embodiment 1 of the present utility model;

FIG. 4 is a cross-sectional view of a strut of embodiment 1 of the present utility model;

FIG. 5 is a perspective view of a valve seat according to embodiment 1 of the present utility model;

FIG. 6 is another perspective view of the valve seat of embodiment 1 of the present utility model;

FIG. 7 is a cross-sectional view of a valve seat of embodiment 1 of the present utility model;

fig. 8 is a perspective view of the right housing of embodiment 1 of the present utility model;

Fig. 9 is a sectional view of the right housing of embodiment 1 of the present utility model;

Fig. 10 is a cross-sectional view of a valve seat of embodiment 2 of the present utility model.

Description of the reference numerals: the device comprises a shell 1, a guide groove 11, a right end opening 111, an air inlet hole 12, a left shell 13, a right shell 14, a convex column 141, a coil component 2, a coil framework 21, a coil 22, a socket 23, a coil gland 24, sealant 25, a hollow tube 3, a limit mandrel 4, a spring 5, a slide column 6, a slide column main body 61, a groove 611, a second cavity 612, a slide column head 62, a concave surface 621, an annular limit surface 622, a first cavity 623, a communication hole 624, a sealing pad 625, a communication area 626, a valve seat 7, an air passing hole 71, a concave area 72, an annular support top surface 73, a sealing protrusion 74, a spray head 8 and a filter screen 9.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Example 1

As shown in fig. 2-9, an air nozzle of the present utility model comprises a housing 1, a coil assembly 2, a hollow tube 3, a stopper rod 4, a spring 5, a spool 6, a valve seat 7, and a nozzle head 8.

As shown in fig. 2, the coil assembly 2 includes a bobbin 21 provided inside the housing 1, a coil 22 wound between the bobbin 21 and the housing 1, and a socket 23 provided at the left end of the housing 1 and electrically connected to the coil 22.

The hollow tube 3, the sliding column 6 and the valve seat 7 are sequentially penetrated into the shell 1 from left to right and are coaxial with the central axis of the coil framework 21;

The hollow pipe 3 is fixedly connected to the left side inside the shell 1, and a limiting core rod 4 is arranged in the hollow pipe 3; a guide groove 11 is formed on the right side of the inside of the shell 1, a hollow tube 3 is arranged on the left side of the guide groove 11, the right end of the guide groove 11 is a right end opening 111 communicated with the outside of the shell 1, the valve seat 7 is fixedly connected to the right end opening 111 in the guide groove 11, and the valve seat 7 can be welded to the right end opening 111; the sliding column 6 can slide left and right in the guide groove 11 in a reciprocating manner; the spray head 8 is arranged on the right side of the shell 1 and is communicated with the right end opening 111, the right side of the outer wall of the shell 1 is provided with an air inlet hole 12 which is directly communicated with the guide groove 11 inside the shell 1, and the outer side of the air inlet hole 12 is provided with a filter screen 9.

A spring 5 is arranged between the sliding column 6 and the left limiting core rod 4, and a gap is reserved between the left side of the sliding column 6 and the hollow tube 3 when the sliding column 6 is pressed against the valve seat 7 by the elasticity of the spring 5; the sliding column 6 comprises a sliding column main body 61 and a sliding column head 62 protruding on the right side of the sliding column main body 61, the outer diameter of the sliding column main body 61 is equal to the inner diameter of the guide groove 11, the outer diameter of the sliding column head 62 is smaller than the inner diameter of the guide groove 11, the right end face of the sliding column head 62 is movably clung to the left end face of the valve seat 7, and the diameter of the right end face of the sliding column head 62 can be 6mm; the middle part of the valve seat 7 is provided with a gas passing hole 71 which penetrates through the left end and the right end, and the gas passing hole 71 can be sealed and closed by the right end face of the sliding column head 62.

Therefore, the sliding column 6 can slide in the guide groove 11 to squeeze the spring 5 to be separated from the valve seat 7 by utilizing the magnetic force generated after the sliding column 6 is electrified by the coil 22, and the air inlet hole 12 and the air passing hole 71 can be conducted after the right end surface of the sliding column head 62 is separated from the left end surface of the valve seat 7 to generate a gap due to the fact that the outer diameter of the sliding column head 62 is smaller than the inner diameter of the guide groove 11, namely, natural gas sequentially passes through the air inlet hole 12, the area between the sliding column head 62 and the guide groove 11, the air passing hole 71 and the spray head 8 and then is sprayed out from the spray head 8. After the coil 22 is powered off, the spool 6 is pressed against the valve seat 7 again under the action of the spring 5, and the air passing hole 71 is sealed. In this embodiment, a concave surface 621 is disposed in the middle of the right end surface of the sliding column head 62, an elastic sealing pad 625 is embedded in the concave surface 621, a concave area 72 is concavely disposed in the middle of the valve seat 7 corresponding to the concave surface 621, and an air passing hole 71 is disposed in the concave area 72, and the air passing hole 71 is movably blocked by the sealing pad 625.

In this embodiment, the air passing holes 71 may be four arc holes and circumferentially and uniformly distributed around the center of the valve seat 7, and the left end surface of the valve seat 7 is provided with a circle of sealing protrusions 74 on the inner side and the outer side of each air passing hole 71 along the radial direction of the valve seat 7, where the sealing protrusions 74 are protruding structures protruding from the left end surface of the valve seat 7; when the right end face of the slider head 62 is attached to the left end face of the valve seat 7, the seal 625 and the seal boss 74 abut against each other, and the seal boss 74 is fitted into the seal 625 having the extrusion elasticity, so that the seal effect of the seal 625 against each of the air passing holes 71 is enhanced.

And the elastic sealing gasket 625 can avoid serious abrasion caused by hard collision between the sliding column head 62 and the valve seat 7, thereby ensuring the sealing effect.

In this embodiment, a ring-shaped limiting surface 622 is formed on the outer side of the concave surface 621, and an annular supporting surface 73 is formed on the outer side of the corresponding ring-shaped limiting surface 622. Therefore, when the sliding column head 62 of the sliding column 6 is tightly attached to the valve seat 7, the sealing pad 625 is tightly attached to the air passing hole 71 in the concave area 72, and the annular limiting surface 622 is tightly attached to the annular abutting surface 73 to realize limiting, so that the sealing protrusion 74 can be further prevented from damaging the sealing pad 625 and directly colliding with the right end face of the sliding column head 62.

Referring to fig. 3 and 4, in the present embodiment, the sliding column head 62 of the sliding column 6 has a first cavity 623 inside which is communicated with the concave surface 621, meanwhile, a circle of communication area 626 is concavely provided on the outer periphery of the sliding column head 62, and the communication area 626 is located on the air inlet hole 12, and at least one communication hole 624 is provided in the communication area 626 to communicate the first cavity 623 and the guide groove 11, and the sealing pad 625 is annular, and the annular middle hole of the sealing pad 625 is communicated with the first cavity 623, therefore, when the air inlet hole 12 is in air, the sliding column 6 is separated from the valve seat 7, the natural gas can also sequentially pass through the air inlet hole 12, the communication hole 624, the first cavity 623, the annular middle hole of the sealing pad 625, the air passing hole 71 and the nozzle 8, and then be sprayed out from the nozzle 8, so as to improve the air spraying amount and the air spraying efficiency.

While the recessed communication area 626 may increase the intake area to facilitate intake of the intake port 12.

A circle of grooves 611 are formed in the middle of the peripheral wall of the sliding column main body 61 so as to facilitate the sliding of the sliding column main body 61 relative to the guide groove 11; the interior of the spool body 61 has a second cavity 612 communicating the left end of the spool 6 with the first cavity 623 of the spool head 62 to balance air pressure, while the end of the spring 5 is slidably received in the second cavity 612.

Referring to fig. 8 and 9, in the present embodiment, the housing 1 includes a left housing 13 and a right housing 14 combined left and right; the right end of the left shell 13 is covered on the periphery of the left end of the right shell 14, the coil framework 21 and the coil 22 are positioned in the left shell 13, a coil gland 24 can be arranged between the socket 23 and the left shell 13 to fix the left side of the coil 22, the left end of the right shell 14 is provided with a convex column 141 and extends into the right end of the left shell 13, and a sealant 25 is arranged between the left end of the right shell 14 and the right side of the coil framework 21.

The hollow tube 3 is arranged in the left shell 13 in a penetrating way and positioned in the middle of the coil framework 21; the guide slot 11 is arranged inside the right shell 14 and penetrates through the left end and the right end of the right shell 14, the sliding column 6 and the valve seat 7 are both positioned inside the right shell 14, the air inlet holes 12 are also formed in the right shell 14, in particular, three air inlet holes 12 are circumferentially arranged on the peripheral wall of the right shell 14 at intervals, the air inlet holes 12 can be vertically communicated with the guide slot 11 and the communication area 626, and the air inlet holes 12 are formed in the right shell 14 on the right side of the shell 1, so that quick air inlet can be realized.

Example 2

As shown in fig. 10, the structure of this embodiment is basically the same as that of embodiment 1 described above, with the main difference that the structure of the valve seat 7 and the gasket 625 is different, the air passing hole 71 of the valve seat 7 of this embodiment is disposed in the center of the concave area 72 in the middle of the valve seat 7 and penetrates left and right, while the outer periphery of the air passing hole 72 of the valve seat 7 is also provided with a sealing protrusion 74 protruding from the left end surface of the valve seat 7, and the corresponding elastic gasket 625 is circular and is tightly fitted to the sealing protrusion 74.

In summary, in the air nozzle of the present utility model, the sliding column 6 is provided, so that the air nozzle can keep normally closed with the valve seat 7 under the action of the spring 5, and can smoothly slide in the guide groove 11 under the action of the magnetic attraction of the coil 22, and the sliding column head 62 of the sliding column 6, the sealing pad 625, the annular limiting surface 622 and the like are designed to be stably separated from the valve seat 7, so that the air inlet hole 12 and the air passing hole 71 are smoothly conducted, and the air is conveniently sprayed out by the spray head 8.

The above description is only a preferred embodiment of the present utility model, and the protection scope of the present utility model is not limited to the above examples, and all technical solutions belonging to the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that equivalent changes and modifications can be made by those skilled in the art without departing from the principles of the present utility model, which still falls within the scope of the present utility model.

In the description of the embodiments of the present application, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship conventionally put in place when the application product is used, or the orientation or positional relationship conventionally understood by those skilled in the art is merely for convenience of describing the present application and simplifying the description, and is not indicative or implying that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" and "a number" means two or more, unless specifically defined otherwise.

In the description of the embodiments of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The above disclosure provides many different embodiments, or examples, for implementing different structures of the application. The foregoing description of specific example components and arrangements has been presented to simplify the present disclosure. They are, of course, merely examples and are not intended to limit the application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed.

In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.

Claims (10)

1. An air nozzle, characterized in that:

The device comprises a shell, a coil assembly, a hollow tube, a limiting core rod, a spring, a sliding column, a valve seat and a spray head;

The coil assembly comprises a coil framework arranged in the shell, a coil wound between the coil framework and the shell, and a socket arranged at the left end of the shell and electrically connected with the coil;

The hollow tube, the sliding column and the valve seat are sequentially penetrated in the shell from left to right and are coaxial with the central axis of the coil framework;

A guide groove is formed on the right side inside the shell, and an air inlet hole which is directly communicated with the guide groove is formed on the right side of the outer wall of the shell;

The left side of the guide groove is provided with the hollow pipe, the right end of the guide groove is provided with a right end opening communicated with the outside of the shell, the valve seat is fixedly connected to the right end opening, and the middle part of the valve seat is provided with an air passing hole penetrating through the left end and the right end;

The sliding column can slide left and right in the guide groove in a reciprocating manner, and an elastic piece is arranged between the sliding column and the left hollow pipe; the sliding column comprises a sliding column main body and a sliding column head which is convexly arranged on the right side of the sliding column main body, the outer diameter of the sliding column main body is equal to the inner diameter of the guide groove, the outer diameter of the sliding column head is smaller than the inner diameter of the guide groove, and the right end face of the sliding column head is movably clung to the left end face of the valve seat;

The spray head is arranged on the right side of the shell and communicated with the opening at the right end.

2. An air nozzle as claimed in claim 1, wherein: the middle part of the right end face of the sliding column head is provided with a concave surface, an elastic sealing gasket is arranged in the concave surface, the middle part of the valve seat corresponding to the concave surface is concavely provided with a concave area, the concave area is internally provided with the air passing hole, and the air passing hole is blocked by the movable sealing gasket.

3. An air nozzle as claimed in claim 2, wherein: the number of the air passing holes is several, the air passing holes are uniformly distributed at intervals in the circumferential direction around the center of the valve seat, and meanwhile, the left end face of the valve seat is respectively provided with a circle of sealing bulges at the inner side and the outer side of each air passing hole along the radial direction of the valve seat, and the sealing bulges are bulge structures protruding out of the left end face of the valve seat; the sealing gasket is mutually abutted with the sealing bulge; the outer side of the concave surface forms a circle of annular limiting surface, and the outer side of the concave area corresponding to the annular limiting surface is an annular abutting surface.

4. An air nozzle as claimed in claim 2, wherein: the air passing hole of the valve seat is arranged in the center of the concave area in the middle of the valve seat; the left end face of the valve seat is provided with a circle of sealing bulges at the periphery of the air passing hole, and the sealing bulges are bulge structures protruding out of the left end face of the valve seat; the sealing gasket is mutually abutted with the sealing bulge; the outer side of the concave surface forms a circle of annular limiting surface, and the outer side of the concave area corresponding to the annular limiting surface is an annular abutting surface.

5. A gas nozzle according to claim 2 or 3, characterized in that: the inside of the sliding column head of the sliding column is provided with a first cavity communication concave surface, and meanwhile, the peripheral wall of the sliding column head is concavely provided with a circle of communication area which is positioned on the air inlet hole; at least one communication hole is arranged in the communication area and is used for communicating the first cavity and the guide groove; the sealing gasket is annular, and the annular middle hole of the sealing gasket is communicated with the first cavity.

6. An air nozzle as defined in claim 5, wherein: the sliding column main body is internally provided with a second cavity communicated with the left end of the sliding column and the first cavity of the sliding column head; the hollow pipe is fixedly connected to the left side inside the shell, and a limiting core rod is arranged in the hollow pipe; the elastic piece is a spring, and the spring is positioned between the sliding column and the limiting core rod; the end of the spring is positioned in the second cavity in a penetrating way.

7. An air nozzle as claimed in claim 1, wherein: the middle part of the peripheral wall of the sliding column main body is provided with a circle of groove.

8. An air nozzle as claimed in claim 1, wherein: the shell comprises a left shell and a right shell which are combined left and right; the left end cover of the left shell is arranged at the periphery of the left end of the right shell, the coil framework and the coil are positioned in the left shell, a coil gland is arranged between the socket and the left shell to fix the left side of the coil fixing, the left end of the right shell is provided with a convex column and extends into the right end of the left shell, and sealant is arranged between the left end of the right shell and the right side of the coil framework.

9. An air nozzle as claimed in claim 8, wherein: the hollow tube penetrates through the left shell and is positioned in the middle of the coil framework; the guide way is arranged inside the right shell and penetrates through the left end and the right end of the right shell, the sliding column and the valve seat are both positioned inside the right shell, and the air inlet hole is formed in the right shell.

10. An air nozzle according to claim 8 or 9, characterized in that: three air inlets are circumferentially arranged on the peripheral wall of the right shell at intervals; and a filter screen is arranged at the outer side of each air inlet.