CN116351593A

CN116351593A - Nozzle atomizing mechanism and nozzle

Info

Publication number: CN116351593A
Application number: CN202310155958.7A
Authority: CN
Inventors: 李碧君
Original assignee: Chandler Trading Shanghai Co ltd
Current assignee: Chandler Trading Shanghai Co ltd
Priority date: 2023-02-10
Filing date: 2023-02-23
Publication date: 2023-06-30

Abstract

The invention belongs to the technical field of spraying, and particularly relates to a nozzle atomization mechanism and a nozzle. It has solved the insufficient scheduling condition of atomizing under the low pressure state of prior art. The nozzle atomization mechanism comprises a pre-expansion piece and a post-treatment piece which are sequentially sealed and abutted from feeding to spraying, wherein first taper holes distributed along an X axis are formed in the pre-expansion piece, post-treatment holes which are communicated with the first taper holes are formed in the post-treatment piece, the aperture of a large-caliber end of each first compression hole is larger than that of each post-treatment hole, and wedge-shaped backflow areas are formed at the communicated positions of the first compression holes and the post-treatment holes. The application has the advantages that: atomized spray uniformity.

Description

Nozzle atomizing mechanism and nozzle

Technical Field

The invention belongs to the technical field of spraying, and particularly relates to a nozzle atomization mechanism and a nozzle.

Background

Atomized spraying is achieved by using a nozzle.

The injection hole path of the existing nozzle includes a feed port, an intermediate compression port, and an atomizing injection port. The intermediate compression accelerates the flow rate of the spray to increase the spray pressure. For example, chinese patent discloses an air assisted spray nozzle assembly, patent number CN01111963.2, which includes an air cap to efficiently generate a wide flat jet spray pattern with relatively low air flow and pressure, and to enhance comminution of liquid particles. The air cap has a pair of longitudinally extending air passages on opposite sides of the central liquid flow discharge opening. Each air passage has an exhaust port defined by a downstream transverse deflector flange and a closely spaced, inwardly tapered deflector surface which cooperate to direct and deflect the pressurized air stream inwardly against the exiting liquid stream to atomize the liquid stream into a predetermined spray pattern.

The above scheme, which is assisted by air to further increase the injection pressure, has the advantages as above, but has disadvantages in that: in the low pressure state, the small middle and large two ends of the channel in the middle of the nozzle have poor atomization effect on the spray, so that only an air-assisted high-cost mode can be adopted, and the spray is atomized and sprayed.

Disclosure of Invention

The present invention has been made in view of the above problems, and an object of the present invention is to provide a nozzle atomizing mechanism and a nozzle capable of solving the above problems.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

the nozzle atomization mechanism comprises a pre-expansion piece and a post-treatment piece which are sequentially sealed and abutted from feeding to spraying, wherein first taper holes distributed along an X axis are formed in the pre-expansion piece, post-treatment holes which are communicated with the first taper holes are formed in the post-treatment piece, the aperture of a large-caliber end of each first compression hole is larger than that of each post-treatment hole, and wedge-shaped backflow areas are formed at the communicated positions of the first compression holes and the post-treatment holes.

In the nozzle atomization mechanism, the post-treatment piece comprises a second core block, second taper holes distributed along the X axis are formed in the second core block, the first taper holes are communicated with the second taper holes and form expansion chambers with the diameters gradually reduced from the middle to the two ends, and the diameter of the large-caliber end of each first taper hole is larger than that of the large-caliber end of each second taper hole and forms the wedge-shaped backflow area in the middle of each expansion chamber.

In the nozzle atomization mechanism, the second core block is close to one end face of the pre-expansion piece and a local hole wall of the large-caliber end of the first taper hole to form the wedge-shaped backflow area.

In the nozzle atomization mechanism, the small-caliber end of the first taper hole is connected with a first compression hole, the small-caliber end of the second taper hole is connected with a second compression hole, and the aperture of the first compression hole is smaller than that of the second compression hole.

In the nozzle atomization mechanism, the hole wall of the first taper hole and the X axis form a first acute angle, and the hole wall of the second taper hole and the X axis form a second acute angle.

As a first mode, in the nozzle atomization mechanism, a first acute angle formed by the hole wall of the first taper hole and the X axis is larger than a second acute angle formed by the hole wall of the second taper hole and the X axis.

As a second mode, in the nozzle atomization mechanism, a first acute angle formed by the hole wall of the first taper hole and the X axis is equal to a second acute angle formed by the hole wall of the second taper hole and the X axis.

As a third mode, in the nozzle atomization mechanism, a first acute angle formed by the hole wall of the first taper hole and the X axis is smaller than a second acute angle formed by the hole wall of the second taper hole and the X axis.

In the nozzle atomizing mechanism, the axial hole length of the first compression hole is smaller than the axial length of the expansion chamber in the X axis.

In the nozzle atomizing mechanism, the axial length of the first compression hole is smaller than the axial length of the second compression hole.

As a first aspect, in the above-mentioned nozzle atomizing mechanism, the nozzle atomizing mechanism further includes a feeding pellet, feeding holes distributed along the X-axis are provided on the feeding pellet, the feeding holes are communicated with the first compression holes, and the aperture of the feeding holes is larger than the aperture of the first compression holes of the nozzle atomizing mechanism.

As a second aspect, in the above-described nozzle atomizing mechanism, the nozzle atomizing mechanism further includes a feed pellet on which feed holes distributed along the X-axis are provided, and a pellet mounting hole communicating with the feed holes, the feed hole aperture being smaller than that of the pellet mounting hole, the pre-expansion member and the second pellet being mounted in the pellet mounting hole and the feed hole communicating with the first compression hole.

In the nozzle atomizing mechanism, the first taper hole is any one of a conical hole and a polygonal taper hole.

In the nozzle atomizing mechanism, the second taper hole is any one of a conical hole and a polygonal taper hole.

Aftertreatment component as another embodiment: the post-treatment piece comprises an atomization spray head, an atomization turbulence chamber communicated with the large-caliber end of the first taper hole is arranged in the atomization spray head, the aperture of the large-caliber end of the first taper hole is larger than the inner diameter of the atomization turbulence chamber, and a wedge-shaped backflow area is formed at the communicated position of the first taper hole and the atomization turbulence chamber.

In the nozzle atomization mechanism, the small-caliber end of the first taper hole is connected with a first compression hole.

In the above-mentioned nozzle atomizing mechanism, nozzle atomizing mechanism still includes the raw materials expansion piece that has the raw materials expansion chamber, the axial discharge gate of raw materials expansion chamber with first compression hole intercommunication, and the internal diameter of raw materials expansion chamber is greater than the aperture of first compression hole the axial feed inlet of raw materials expansion chamber is equipped with the raw materials feed hole, raw materials expansion chamber and first compression hole is from feeding to spraying direction along the X axle distributes, the raw materials feed hole aperture is less than the internal diameter of raw materials expansion chamber.

In the nozzle atomization mechanism, a spacer is arranged in the raw material expansion chamber, the inner diameter of the spacer is larger than the aperture of the first compression hole, the inner diameter of the spacer is larger than the aperture of the raw material feeding hole, and the pre-expansion piece is arranged at one end, far away from the raw material feeding hole, of the raw material expansion chamber and is abutted against the spacer.

In the nozzle atomization mechanism, a step groove is formed in one end, away from the raw material feeding hole, of the raw material expansion chamber, and the pre-expansion piece is fixed to the step groove.

In the nozzle atomizing mechanism, a first gasket is arranged between the pre-expansion piece and the plane of the step groove perpendicular to the X axis, and a first through hole which is used for penetrating the raw material expansion chamber and the first compression hole is arranged on the first gasket.

In the above nozzle atomizing mechanism, the aperture of the first through hole is equal to the inner diameter of the raw material expansion chamber.

In the nozzle atomizing mechanism, the aperture of the first through hole is smaller than the inner diameter of the raw material expansion chamber, and the aperture of the first through hole is larger than the aperture of the first compression hole.

In the nozzle atomization mechanism, the notch of the step groove is provided with a second gasket propped against the pre-expansion piece, and the second gasket is provided with a second through hole with the same bore diameter as the large-caliber end of the first taper hole.

The application also provides a nozzle comprising the nozzle atomizing mechanism.

In the above-mentioned nozzle, the nozzle still includes the nozzle body be equipped with from the feeding to spray direction seal in proper order the nozzle atomization mechanism and the atomizing ejection head that lean on the nozzle body, the atomizing ejection head includes along the atomizing turbulent flow chamber, exit hole and the atomizing mouth that X axle distributes in proper order, the atomizing turbulent flow chamber with the second compression hole intercommunication of nozzle atomization mechanism and the aperture of atomizing turbulent flow chamber is greater than the aperture of second compression hole.

In the nozzle, the length of the atomizing turbulence chamber in the X axis is longer than the length of the expansion chamber of the nozzle atomizing mechanism in the X axis.

In the nozzle, the feeding core block is provided with feeding holes which are distributed along the X axis and are communicated with the first compression holes, and the aperture of each feeding hole is larger than that of the first compression hole of the nozzle atomization mechanism.

In the above nozzle, the nozzle body is provided with mounting through holes distributed along the X axis, and the nozzle atomizing mechanism and the atomizing nozzle head are sequentially mounted in the mounting through holes from the feeding direction to the spraying direction.

Compared with the prior art, the application has the advantages that:

the expansion chamber is fed with a small caliber communicated with the first compression hole, the expansion chamber is discharged with a small caliber communicated with the second compression hole, the injection material compressed from the first compression hole enters the first taper hole of the expansion chamber, and at the moment, the injection area of the injection material is enlarged by at least one time from the injection area of the first compression hole, and the injection material is in a wide-angle injection and atomization state; the atomized spray is guided along with contacting the second conical hole, and at the same time, a part of spray flows back due to the wedge-shaped backflow area, and the spray flows back and contacts the hole wall of the first compression hole and is sprayed out along with the spray sprayed by the first compression hole.

The combination of the first taper hole, the second taper hole and the expansion chamber can realize uniform atomization spraying under the low pressure of 1000-1500psi, and the lower pressure can prolong the service life of the spraying nozzle, and meanwhile, the transitional spraying phenomenon of the paint is also solved.

Drawings

Fig. 1 is a schematic view of a nozzle structure provided by the present invention.

Fig. 2 is a partial schematic structure of fig. 1.

FIG. 3 is a schematic view of the structure of a pre-expansion member provided by the present invention.

Fig. 4 is a schematic diagram of a second core block structure according to the present invention.

Fig. 5 is a schematic structural view of a nozzle atomizing mechanism according to the present invention.

Fig. 6 is a schematic structural view of another nozzle atomizing mechanism according to the present invention.

Fig. 7 is a schematic perspective view of an atomization spray head according to the present invention.

Fig. 8 is a schematic view of another view angle atomizing spray head according to the present invention.

Fig. 9 is a schematic diagram of the structure of an atomizing spray head according to the present invention.

Fig. 10 is a state diagram after atomization spraying provided by the invention.

Fig. 11 is a schematic structural diagram of a second embodiment provided by the present invention.

Fig. 12 is a schematic view of a third embodiment provided by the present invention.

Fig. 13 is a schematic view of a fourth embodiment provided by the present invention.

Fig. 14 is a schematic view of a sixth embodiment provided by the present invention.

Fig. 15 is a schematic view of a seventh embodiment provided by the present invention.

Fig. 16 is a schematic view of an eighth embodiment provided by the present invention.

Fig. 17 is a schematic view of a ninth embodiment provided by the present invention.

In the drawing, a nozzle atomizing mechanism 1, a pre-expansion member 10, a first taper hole 100, a first compression hole 101, a second pellet 11, a second taper hole 110, a second compression hole 111, a raw material expansion member 12, a raw material expansion chamber 120, a raw material feed hole 121, a stepped groove 122, a spacer 13, a first gasket 14, a first through hole 140, a second gasket 15, a second through hole 150, a nozzle body 2, a mounting through hole 20, a feed pellet 3, a feed hole 30, a pellet mounting hole 31, an atomizing head 4, an atomizing turbulence chamber 40, an outlet hole 41, an atomizing port 42, an expansion chamber a, a wedge-shaped reflow region A1, a first acute angle A1, and a second acute angle a2.

Detailed Description

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

Example 1

As shown in fig. 1 and 2, the nozzle atomizing mechanism comprises a pre-expansion member 10 and a post-treatment member which are sequentially sealed and abutted from a feeding direction to an injection direction, wherein first taper holes 100 distributed along an X axis are formed in the pre-expansion member 10, post-treatment holes penetrating through the first taper holes 100 are formed in the post-treatment member, the aperture of a large-caliber end of a first compression hole 101 is larger than that of the post-treatment holes, and a wedge-shaped backflow area A1 is formed at the penetrating position of the first compression hole 101 and the post-treatment holes.

Specifically, the post-treatment member of the present embodiment includes the second pellet 11, and the feed pellet 3, the pre-expansion member 10, and the second pellet 11 are sealed against each other in this order from the feed to the injection direction, that is, the injection material enters from the feed pellet 3, the pre-expansion member 10, to the second pellet 11.

Of course, the pre-expansion member 10 and the second core block 11 of this embodiment are circular blocks, so as to facilitate the installation of the installation hole sites, and square blocks can also be selected.

From the feeding to the spraying direction, the two end faces of the pre-expansion piece 10 are parallel to each other, one end face of the feeding core block 3 close to the pre-expansion piece 10 is matched with one end face of the pre-expansion piece 10 close to the feeding core block 3, the two end faces of the second core block 11 are parallel to each other, and one end face of the pre-expansion piece 10 close to the second core block 11 is matched with the corresponding end face of the second core block 11 to abut against, so that the hard annular surface contact sealing is realized.

The feed core 3 is provided with feed holes 30 distributed along the X-axis, and the feed holes 30 communicate with the first compression holes 101. Preferably, the aperture of the feed hole 30 is smaller than the aperture of the first compression hole 101.

The diameter of the pre-expansion member 10 is equal to the diameter of the second core block 11, the diameters being equal to facilitate installation; the thickness of the pre-expansion member 10 is smaller than that of the second core block 11 in terms of thickness, and the thickness of the pre-expansion member is increased or the hardness thereof is increased, so that a longer service life can be provided.

As shown in fig. 2 to 6, the pre-expansion member 10 is provided with first tapered holes 100 distributed along the X-axis and first compressed holes 101 connected to the small diameter end of the first tapered holes 100, and it is understood that the axis of the first tapered holes 100 coincides with the axis of the first compressed holes 101. The second core block 11 is provided with second tapered holes 110 distributed along the X-axis and second compressed holes 111 connected to the small-caliber end of the second tapered holes 110, and the axis of the second tapered holes 110 coincides with the axis of the second compressed holes 111.

The hole wall of the first taper hole 100 and the X axis form a first acute angle a1, and the hole wall of the second taper hole 110 and the X axis form a second acute angle a2. The first taper hole 100 and the second taper hole 110 are communicated and form an expansion chamber A with the aperture gradually reduced from the middle part to the two ends, the aperture of the large-caliber end of the first taper hole 100 is larger than that of the large-caliber end of the second taper hole 110, and a wedge-shaped backflow area A1 is formed in the middle part of the expansion chamber A. Wedge-shaped is understood to mean triangular.

The expansion chamber A is fed with a small caliber communicated with the first compression hole 101, the expansion chamber A is discharged with a small caliber communicated with the second compression hole 111, the injection material compressed from the first compression hole 101 enters the first taper hole 100 of the expansion chamber A, at the moment, the injection area of the injection material is enlarged by at least one time from the injection area of the first compression hole 101, and the injection material is in a wide-angle injection and atomization state; the atomized spray is compressed and accelerated and guided along with contacting the second conical hole 110, meanwhile, a part of the spray flows back due to the wedge-shaped backflow area A1, the spray flows back and contacts the wall of the first compression hole 101 and is sprayed out along with the spray sprayed by the first compression hole 101, in the process, the wedge-shaped backflow area enables the inside of the expansion chamber A to form a circle (radial 360 DEG) backflow state in the spraying and discharging process, so that the spray is fully and uniformly atomized in the expansion chamber A, atomization uniformity is realized in a low-cost state, the specific spraying effect is shown in fig. 10, and the long side and the short side of the spraying surface of fig. 10 are compared with the middle area surrounded by the long side and the short side, and no obvious heavy black dense area exists.

Next, as shown in fig. 6, a first acute included angle a1 formed by the hole wall of the first taper hole 100 and the X axis is greater than a second acute included angle a2 formed by the hole wall of the second taper hole 110 and the X axis. The combination of the structure and the expansion chamber A can realize uniform atomization spraying under the low pressure of 1000-1500psi, and the lower pressure can prolong the service life of the spraying nozzle, and simultaneously solve the transitional spraying phenomenon of the coating.

As shown in FIG. 2, the first compression holes 101 have a diameter of 1/3 to 1/5 of the diameter of the second compression holes 111, for example, the first compression holes 101 have a diameter of 0.4 to 0.8mm. The axial hole length of the first compression hole 101 is smaller than the axial length of the expansion chamber a in the X-axis, and the axial length of the first compression hole 101 is smaller than the axial length of the second compression hole 111. To extend the atomization time in the expansion chamber a to improve the uniformity of atomization.

In the spraying process, the front small and rear large compression holes and the front short and rear long compression holes enter by utilizing the high-speed pressure of the first compression hole, then pre-atomize, and finally discharge to the front-most atomizing spray head 4 after being compressed from the second compression hole.

Preferably, the first taper hole 100 of the present embodiment is any one of a conical hole and a polygonal taper hole. And the second taper hole 110 is any one of a taper hole and a polygonal taper hole.

The axial length of the first taper hole 100 is equal to the axial length of the second taper hole 110; or the axial length of the second tapered bore 110 is longer than the axial length of the first tapered bore 100. The axial length is kept consistent or slightly longer so that the speed of expansion and atomization and expansion is increased.

Example two

As shown in fig. 11, the structure and principle of the present embodiment are substantially the same as those of the first embodiment, except that: the large-caliber end aperture of the first taper hole 100 is smaller than that of the second taper hole 110 and forms a wedge-shaped reflux zone A1 in the middle of the expansion chamber a. At this time, the first acute included angle a1 is smaller than the second acute included angle a2.

Example III

As shown in fig. 12, the structure and principle of the present embodiment are substantially the same as those of the first embodiment, except that: the first acute included angle a1 formed by the hole wall of the first taper hole 100 and the X axis is equal to the second acute included angle a2 formed by the hole wall of the second taper hole 110 and the X axis.

Example IV

The structure and principle of this embodiment are basically the same as those of the first embodiment, and the different structures are as follows:

as shown in fig. 13, the nozzle atomizing mechanism further includes a feed pellet 3, feed holes 30 distributed along the X-axis are provided on the feed pellet 3, and a pellet mounting hole 31 communicating with the feed holes 30, the feed holes 30 having a smaller aperture than that of the pellet mounting hole 31, the pre-expansion member 10 and the second pellet 11 being mounted in the pellet mounting hole 31 and the feed holes 30 communicating with the first compression hole 101.

Under the above-described structure, the pre-expansion member 10 and the second pellet 11 at this time are received in advance and fixed in the pellet mounting hole 31 of the feed pellet 3 so that the three components form a single module, which is finally assembled in a set position to improve efficiency. Meanwhile, the above structure can also ensure concentricity of the first compression hole 101, the first taper hole 100, the second taper hole 110, and the second compression hole to improve spray uniformity.

Next, the end face of the pre-expansion member 10 close to the first compression hole 101 is conformed to the hole bottom face of the pellet mounting hole 31, while an end face of the second pellet 11 remote from the pre-expansion member 10 and an end orifice of the pellet mounting hole 31 remote from the first compression hole 101 are flush. The above structure can make the feeding pellet 3 and the end surface of the second pellet 11 remote from the first compression hole 101 form a common hard contact sealing surface to improve sealability.

That is, the segment provided with the pellet mounting hole 31 has a certain wall thickness portion 32, and the wall thickness portion 32 is fitted over the pre-expansion member 10 and the second pellet 11 so that the pre-expansion member 10, the second pellet 11 and the feed pellet 3 are formed as a single body.

Example five

As shown in fig. 1, the present embodiment provides a nozzle including the nozzle atomizing mechanism 1 of any one of the first to fourth embodiments. And the nozzle also comprises a nozzle body 2, wherein the nozzle body 2 is provided with a nozzle atomizing mechanism 1 and an atomizing spray head 4 which are sequentially sealed and abutted from the feeding direction to the spraying direction, as shown in fig. 7-9, the atomizing spray head 4 comprises an atomizing turbulence chamber 40, an outlet hole 41 and an atomizing port 42 which are sequentially distributed along the X axis, the atomizing turbulence chamber 40 is communicated with a second compression hole 111 of the nozzle atomizing mechanism 1, and the aperture of the atomizing turbulence chamber 40 is larger than that of the second compression hole 111. The atomizing port 42 is a tip nozzle type atomizing port, and the injection angle is 40 °.

The aperture gap is designed so that the pre-atomized spray enters the atomizing turbulence chamber 40 and is further atomized and turbulent, so that the final spray is uniform in injection.

The length of the atomizing turbulence chamber 40 in the X-axis is longer than the length of the expansion chamber a of the nozzle atomizing mechanism 1 in the X-axis. To provide a sufficiently turbulent atomization of the pre-atomized spray.

As shown in fig. 2, the feed core 3 is provided with feed holes 30 distributed along the X-axis and communicating with the first compression holes 101, and the aperture of the feed holes 30 is larger than the aperture of the first compression holes 101 of the nozzle atomizing mechanism 1. The above different designs of the apertures of the feed hole 30 and the first compression hole 101 may result in a stronger compression performance of the first compression hole 101 and a longer axial length of the feed hole 30 than the axial length of the first compression hole 101, e.g. the axial length of the feed hole 30 is at least twice the axial length of the first compression hole 101, this difference being present such that the feed hole 30 has sufficient room for turbulence of the feed, e.g. turbulence threads are provided in the wall of the feed hole 30, as shown in fig. 5.

The following are two fixation schemes:

first kind: as shown in fig. 1 and 2, the nozzle body 2 is provided with mounting through holes 20 distributed along the X axis, and the nozzle atomizing mechanism 1 and the atomizing ejection head 4 are mounted in the mounting through holes 20 in this order from the feed direction toward the ejection direction.

The nozzle atomizing mechanism 1 and the atomizing ejection head 4 can be connected with the mounting through hole 20 by an interference fit. That is, the feed pellet 3, the pre-expansion member 10 and the second pellet 11 of the nozzle atomizing mechanism 1 are fixed with interference fit with the mounting through hole 20, respectively.

Second kind: as shown in fig. 13, the pre-expansion member 10 and the second pellet 11 are received in the pellet mounting hole 31, and the feed pellet 3 is then fixed in the mounting through hole 20 by interference fit.

Example six

The working principle and structure of the embodiment are basically the same as those of the embodiment, and the different structures are as follows:

as shown in fig. 14, the post-treatment member includes an atomizing ejection head 4, an atomizing turbulence chamber 40 penetrating a large-caliber end of a first taper hole 100 is provided in the atomizing ejection head 4, the large-caliber end of the first taper hole 100 has a larger pore diameter than an inner diameter of the atomizing turbulence chamber 40, and a wedge-shaped backflow area A1 is formed at a penetrating position of the first taper hole 100 and the atomizing turbulence chamber 40.

The small caliber end of the first taper hole 100 is connected with a first compression hole 101. The first compression holes 101 are circular holes or other shaped through holes.

And the nozzle atomizing mechanism of the present embodiment further includes a raw material expansion member 12 having a raw material expansion chamber 120, an axial discharge port of the raw material expansion chamber 120 is communicated with the first compression hole 101, and an inner diameter of the raw material expansion chamber 120 is larger than an aperture of the first compression hole 101, a raw material feed hole 121 is provided at an axial feed port of the raw material expansion chamber 120, the raw material feed hole 121, the raw material expansion chamber 120 and the first compression hole 101 are distributed along the X axis from the feed direction to the injection direction, and an aperture of the raw material feed hole 121 is smaller than an inner diameter of the raw material expansion chamber 120. The raw material feed hole 121 is a circular hole, and of course, threads may be formed on the wall of the raw material feed hole 121 to form a turbulent flow.

The raw material expansion chamber 120 combines the raw material feed holes 121 to form a primary expansion of the raw material, and the first compression holes 101 compress the expanded raw material to increase the injection pressure.

A spacer 13 is provided in the raw material expansion chamber 120, the inner diameter of the spacer 13 is larger than the aperture of the first compression hole 101, and the inner diameter of the spacer 13 is larger than the aperture of the raw material feed hole 121, the pre-expansion member 10 is installed at one end of the raw material expansion chamber 120 away from the raw material feed hole 121 and the pre-expansion member 10 abuts against the spacer 13.

The spacer 13 may be replaced with a different inner diameter to accommodate different expansion requirements.

The embodiment can be applied to uniform spraying of viscous liquid.

Example seven

As shown in fig. 15, the working principle and structure of the present embodiment are basically the same as those of the sixth embodiment, and the different structures are as follows: a stepped groove 122 is provided at an end of the raw material expansion chamber 120 remote from the raw material feed hole 121, and the pre-expansion member 10 is fixed to the stepped groove 122. The above solution can make the pre-expansion member 10 and the raw material expansion member 12 form a module whole, so as to facilitate the assembly and disassembly of the whole module.

The discharge end face of the pre-expansion member 10 is flush with the end face of the raw material expansion member 12 where the stepped groove 122 is provided.

Example eight

As shown in fig. 16, according to the seventh embodiment, the present embodiment further provides that a first gasket 14 is provided between the pre-expansion member 10 and the plane of the stepped groove 122 perpendicular to the X axis, and a first through hole 140 is provided in the first gasket 14 to communicate the raw material expansion chamber 120 with the first compression hole 101.

The aperture of the first through-hole 140 is equal to the inner diameter of the raw material expansion chamber 120; or the aperture of the first through-hole 140 is smaller than the inner diameter of the raw material expansion chamber 120, and the aperture of the first through-hole 140 is larger than the aperture of the first compression hole 101; the different first shims 14 are replaced to meet different pressure injection requirements.

Example nine

As shown in fig. 17, according to the eighth embodiment, the present embodiment further provides a second spacer 15 that abuts against the pre-expansion member 10 at the notch of the stepped groove 122, and a second through hole 150 having the same diameter as the large diameter end of the first taper hole 100 is provided in the second spacer 15. An end surface of the second gasket 15 remote from the pre-expansion member 10 is flush with an end surface of the raw material expansion member 12 where the stepped groove 122 is provided.

Examples ten

The embodiment provides a spray gun and spraying equipment using the spray gun. The spray gun and the spraying device are all available commercial products, the structure of the spray gun is not further described in the embodiment, and the nozzle in the spray gun comprises the nozzle atomization mechanism or the nozzle in any one of the first embodiment to the ninth embodiment.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The spray nozzle atomization mechanism is characterized by comprising a pre-expansion piece (10) and a post-treatment piece which are sequentially sealed and abutted from feeding to spraying, wherein first taper holes (100) distributed along an X axis are formed in the pre-expansion piece (10), post-treatment holes which are communicated with the first taper holes (100) are formed in the post-treatment piece, the aperture of a large-caliber end of the first compression hole (101) is larger than that of the post-treatment hole, and a wedge-shaped backflow area (A1) is formed at the communicated position of the first compression hole (101) and the post-treatment hole.

2. Nozzle atomising mechanism according to claim 1, characterized in that the post-treatment element comprises a second core block (11), second conical holes (110) distributed along the X-axis are arranged on the second core block (11), the first conical holes (100) and the second conical holes (110) are communicated and form an expansion chamber (a) with a gradually reduced aperture from the middle to the two ends, the aperture of the large-caliber end of the first conical holes (100) is larger than the aperture of the large-caliber end of the second conical holes (110) and the wedge-shaped reflux zone (A1) is formed in the middle of the expansion chamber (a).

3. Nozzle atomising mechanism according to claim 2, characterized in that the second pellet (11) forms the wedge-shaped recirculation zone (A1) close to an end face of the pre-expansion element (10) and to a partial wall of the large bore end of the first cone bore (100).

4. The nozzle atomization mechanism according to claim 2, wherein the small-caliber end of the first cone hole (100) is connected with a first compression hole (101), the small-caliber end of the second cone hole (110) is connected with a second compression hole (111), and the aperture of the first compression hole (101) is smaller than that of the second compression hole (111).

5. Nozzle atomizing mechanism according to claim 4, characterized in that said first compression orifice (101) has an axial orifice length smaller than the axial length of said expansion chamber (a) in said X-axis; the axial length of the first compression hole (101) is smaller than the axial length of the second compression hole (111).

6. The nozzle atomizing mechanism according to claim 1, characterized in that the first cone hole (100) is any one of a cone hole and a polygonal cone hole; the second taper hole (110) is any one of a conical hole and a polygonal taper hole.

7. Nozzle atomising mechanism according to claim 1 characterized in that it further comprises a feed pellet (3), on which feed pellet (3) feed holes (30) are provided distributed along the X-axis, the feed holes (30) being in communication with the first compression holes (101).

8. Nozzle atomising mechanism according to claim 1, characterized in that it further comprises a feed pellet (3), on which feed pellet (3) feed holes (30) distributed along the X-axis are provided, and a pellet mounting hole (31) communicating with the feed holes (30), the feed holes (30) having a smaller pore size than the pellet mounting hole (31), the pre-expansion element (10) and the second pellet (11) being mounted in the pellet mounting hole (31) and the feed holes (30) communicating with the first compression hole (101).

9. Nozzle atomising mechanism according to claim 1, characterized in that the post-treatment element comprises an atomising ejection head (4), an atomising turbulence chamber (40) is provided in the atomising ejection head (4) in communication with the large bore end of the first cone bore (100), the large bore end bore diameter of the first cone bore (100) is larger than the inner diameter of the atomising turbulence chamber (40), and the communication between the first cone bore (100) and the atomising turbulence chamber (40) forms the wedge-shaped recirculation zone (A1).

10. The nozzle atomizing mechanism according to claim 9, wherein the first cone orifice (100) has a first compression orifice (101) connected to a small bore end thereof.

11. Nozzle atomizing mechanism according to claim 10, characterized in that it further comprises a raw material expansion piece (12) having a raw material expansion chamber (120), an axial discharge opening of the raw material expansion chamber (120) is communicated with the first compression hole (101), and an inner diameter of the raw material expansion chamber (120) is larger than an aperture of the first compression hole (101), a raw material feed hole (121) is provided at an axial feed opening of the raw material expansion chamber (120), the raw material feed hole (121), the raw material expansion chamber (120) and the first compression hole (101) are distributed along the X-axis from a feed direction to a spray direction, and the raw material feed hole (121) aperture is smaller than the inner diameter of the raw material expansion chamber (120).

12. Nozzle atomizing mechanism according to claim 11, characterized in that a spacer (13) is provided in the raw material expansion chamber (120), the inner diameter of the spacer (13) is larger than the aperture of the first compression hole (101), and the inner diameter of the spacer (13) is larger than the aperture of the raw material feed hole (121), the pre-expansion member (10) is mounted at the end of the raw material expansion chamber (120) remote from the raw material feed hole (121) and the pre-expansion member (10) and the spacer (13) are abutted against each other.

13. Nozzle atomising mechanism according to claim 11, characterized in that the end of the raw material expansion chamber (120) remote from the raw material feed aperture (121) is provided with a stepped groove (122), the pre-expansion element (10) being fixed to the stepped groove (122).

14. Nozzle atomising mechanism according to claim 13, characterized in that a first gasket (14) is arranged between the pre-expansion element (10) and the plane of the step groove (122) perpendicular to the X-axis, and a first through hole (140) is arranged on the first gasket (14) for penetrating the raw material expansion chamber (120) and the first compression hole (101).

15. The nozzle atomizing mechanism according to claim 14, wherein a bore diameter of said first through bore (140) is equal to an inner diameter of said raw material expansion chamber (120).

16. The nozzle atomizing mechanism according to claim 14, wherein a pore diameter of the first through hole (140) is smaller than an inner diameter of the raw material expansion chamber (120), and a pore diameter of the first through hole (140) is larger than a pore diameter of the first compression hole (101).

17. Nozzle atomising mechanism according to claim 15, characterized in that the notch of the step groove (122) is provided with a second gasket (15) against the pre-expansion element (10), the second gasket (15) being provided with a second through hole (150) with a diameter equal to the diameter of the large-caliber end of the first cone hole (100).

18. Nozzle, characterized in that it comprises a nozzle atomisation mechanism (1) according to any of the claims 2-8.

19. Nozzle according to claim 18, characterized in that it further comprises a nozzle body (2), on which nozzle body (2) there are provided a nozzle atomizing mechanism (1) and an atomizing ejection head (4) which are sealed against each other in succession from the feed to the ejection direction, said atomizing ejection head (4) comprising an atomizing turbulence chamber (40), an outlet orifice (41) and an atomizing orifice (42) distributed in succession along said X-axis, said atomizing turbulence chamber (40) being in communication with a second compression orifice (111) of said nozzle atomizing mechanism (1) and the aperture of said atomizing turbulence chamber (40) being larger than the aperture of said second compression orifice (111).

20. Nozzle according to claim 19, characterized in that the length of the atomizing turbulence chamber (40) in the X-axis is longer than the length of the expansion chamber (a) of the nozzle atomizing mechanism (1) in the X-axis.

21. Nozzle according to claim 19, characterized in that feed holes (30) distributed along the X-axis and communicating with the first compression holes (101) are provided in the feed pellet (3), turbulent threads are provided in the wall of the feed holes (30), the feed holes (30) having a larger pore diameter than the first compression holes (101) of the nozzle atomizing mechanism (1).

22. Nozzle according to claim 19, characterized in that the nozzle body (2) is provided with mounting through holes (20) distributed along the X-axis; the nozzle atomization mechanism (1) and the atomization spray head (4) are sequentially arranged in the installation through hole (20) from the feeding direction to the spraying direction.