Nozzle atomization mechanism and nozzle

Abstract

The present invention belongs to the technical field of spraying, and particularly relates to a nozzle atomization mechanism and a nozzle. It solves the problems of insufficient atomization under low pressure in the prior art. This nozzle atomization mechanism includes a pre-expansion member and a post-treatment member that are hermetically abutted in sequence from the feed direction to the spraying direction. A first tapered hole distributed along the X-axis is provided on the pre-expansion member, and a post-treatment hole communicating with the first tapered hole is provided on the post-treatment member. The aperture of the large-diameter end of the first tapered hole is larger than the aperture of the post-treatment hole, and a wedge-shaped reflux zone is formed at the communication part of the first tapered hole and the post-treatment hole. Advantages of this application: Uniformity of atomization spraying.

Description

Technical Field

[0001] The present invention belongs to the technical field of spraying, and particularly relates to a nozzle atomization mechanism and a nozzle. Background Art

[0002] Atomized spraying is achieved by using a nozzle.

[0003] The injection hole path of the existing nozzle includes a feed port, an intermediate compression port, and an atomized injection port. The intermediate compression increases the flow rate of the ejecta to improve the injection pressure. For example, a Chinese patent discloses an air-assisted nozzle assembly with the patent number CN01111963.2, which includes an air cap to effectively generate a relatively wide flat jet shape using a relatively low air flow rate and pressure, and enhances the pulverization of liquid particles. The air cap has a pair of longitudinally extending air channels on the opposite side of the central liquid flow discharge port. Each air channel has a discharge port, which is determined by a downstream transverse deflection flange and a small-spaced, inwardly tapered deflection surface, which together guide and deflect the pressurized air flow so that the pressurized air flows inwardly against the discharged liquid flow, thereby atomizing the liquid flow and guiding it into a predetermined jet shape.

[0004] The above solution uses air for assistance to further increase the injection pressure. Although it has the above advantages, the disadvantage of the above solution is that: at a low pressure state, the channel with a small middle and large ends in the middle of the nozzle has a poor atomization effect on the ejecta, resulting in only the high-cost method of using air assistance to atomize and eject the ejecta. Summary of the Invention

[0005] The purpose of the present invention is to address the above problems and provide a nozzle atomization mechanism and a nozzle that can solve the above technical problems.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] This nozzle atomization mechanism includes a pre-expansion member and a post-treatment member that are hermetically abutted in sequence from the feed direction to the injection direction. A first tapered hole is provided on the pre-expansion member and is distributed along the X-axis. A post-treatment hole is provided on the post-treatment member and is communicated with the first tapered hole. The aperture of the large-diameter end of the first tapered hole is larger than the aperture of the post-treatment hole, and a wedge-shaped reflux zone is formed at the through portion of the first tapered hole and the post-treatment hole.

[0008] In the above nozzle atomization mechanism, the post-treatment member includes a second core block. A second tapered hole is provided on the second core block and is distributed along the X-axis. The first tapered hole and the second tapered hole are communicated to form an expansion chamber with a gradually decreasing aperture from the middle to both ends. The aperture of the large-diameter end of the first tapered hole is larger than the aperture of the large-diameter end of the second tapered hole, and the wedge-shaped reflux zone is formed in the middle of the expansion chamber.

[0009] In the above nozzle atomization mechanism, one end face of the second core block close to the pre-expansion member and a partial hole wall at the large-diameter end of the first tapered hole form the wedge-shaped reflux zone.

[0010] In the above nozzle atomization mechanism, a first compression hole is connected to the small-diameter end of the first tapered hole, and a second compression hole is connected to the small-diameter end of the second tapered hole. The aperture of the first compression hole is smaller than the aperture of the second compression hole.

[0011] In the above nozzle atomization mechanism, the hole wall of the first tapered hole forms a first acute angle with the X-axis, and the hole wall of the second tapered hole forms a second acute angle with the X-axis.

[0012] As a first mode, in the above nozzle atomization mechanism, the first acute angle formed by the hole wall of the first tapered hole and the X-axis is greater than the second acute angle formed by the hole wall of the second tapered hole and the X-axis.

[0013] As a second mode, in the above nozzle atomization mechanism, the first acute angle formed by the hole wall of the first tapered hole and the X-axis is equal to the second acute angle formed by the hole wall of the second tapered hole and the X-axis.

[0014] As a third mode, in the above nozzle atomization mechanism, the first acute angle formed by the hole wall of the first tapered hole and the X-axis is smaller than the second acute angle formed by the hole wall of the second tapered hole and the X-axis.

[0015] In the above nozzle atomization mechanism, the axial hole length of the first compression hole is smaller than the axial length of the expansion chamber in the X-axis direction.

[0016] In the above nozzle atomization mechanism, the axial length of the first compression hole is smaller than the axial length of the second compression hole.

[0017] As a first solution, in the above nozzle atomization mechanism, the nozzle atomization mechanism further includes a feed core block. A feed hole distributed along the X-axis is provided on the feed core block. The feed hole is communicated with the first compression hole, and the aperture of the feed hole is larger than the aperture of the first compression hole of the nozzle atomization mechanism.

[0018] As a second solution, in the above nozzle atomization mechanism, the nozzle atomization mechanism further includes a feed core block. A feed hole distributed along the X-axis, and a core block mounting hole communicated with the feed hole are provided on the feed core block. The aperture of the feed hole is smaller than the aperture of the core block mounting hole. The pre-expansion member and the second core block are installed in the core block mounting hole and the feed hole is communicated with the first compression hole.

[0019] In the above nozzle atomization mechanism, the first tapered hole is any one of a conical hole and a polygonal tapered hole.

[0020] In the above nozzle atomization mechanism, the second tapered hole is any one of a conical hole and a polygonal tapered hole.

[0021] As another embodiment, the post-treatment member includes an atomizing spray head. An atomizing turbulent flow chamber communicating with the large-diameter end of the first tapered hole is provided in the atomizing spray head. The aperture of the large-diameter end of the first tapered hole is larger than the inner diameter of the atomizing turbulent flow chamber, and a wedge-shaped recirculation zone is formed at the through-hole of the first tapered hole and the atomizing turbulent flow chamber.

[0022] In the above nozzle atomization mechanism, the small-diameter end of the first tapered hole is connected with a first compression hole.

[0023] In the above nozzle atomization mechanism, the nozzle atomization mechanism further includes a raw material expansion member having a raw material expansion chamber. The axial discharge port of the raw material expansion chamber communicates with the first compression hole, and the inner diameter of the raw material expansion chamber is larger than the aperture of the first compression hole. A raw material feed hole is provided at the axial feed port of the raw material expansion chamber. The raw material feed hole, the raw material expansion chamber, and the first compression hole are distributed along the X-axis from the feed direction to the spraying direction, and the aperture of the raw material feed hole is smaller than the inner diameter of the raw material expansion chamber.

[0024] In the above nozzle atomization mechanism, a spacer sleeve is provided in the raw material expansion chamber. The inner diameter of the spacer sleeve is larger than the aperture of the first compression hole, and the inner diameter of the spacer sleeve is larger than the aperture of the raw material feed hole. The pre-expansion member is installed at one end of the raw material expansion chamber away from the raw material feed hole and abuts against the spacer sleeve.

[0025] In the above nozzle atomization mechanism, a stepped groove is provided at one end of the raw material expansion chamber away from the raw material feed hole, and the pre-expansion member is fixed in the stepped groove.

[0026] In the above nozzle atomization mechanism, a first gasket is provided between the pre-expansion member and the plane perpendicular to the X-axis of the stepped groove. A first through-hole communicating the raw material expansion chamber and the first compression hole is provided on the first gasket.

[0027] In the above nozzle atomization mechanism, the aperture of the first through-hole is equal to the inner diameter of the raw material expansion chamber.

[0028] In the above nozzle atomization 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.

[0029] In the above nozzle atomization mechanism, a second gasket that abuts against the pre-expansion member is provided at the notch of the stepped groove, and a second through hole having the same aperture as the large-diameter end of the first tapered hole is provided on the second gasket.

[0030] The present application also provides a nozzle, and the nozzle includes the above nozzle atomization mechanism.

[0031] In the above nozzle, the nozzle further includes a nozzle body, and the nozzle atomization mechanism and the atomizing nozzle head that are hermetically abutted in sequence from the feed direction to the spraying direction are provided on the nozzle body. The atomizing nozzle head includes an atomizing turbulent flow chamber, an outlet hole, and an atomizing port that are sequentially distributed along the X axis. The atomizing turbulent flow chamber communicates with the second compression hole of the nozzle atomization mechanism, and the aperture of the atomizing turbulent flow chamber is larger than the aperture of the second compression hole.

[0032] In the above nozzle, the length of the atomizing turbulent flow chamber along the X axis is longer than the length of the expansion chamber of the nozzle atomization mechanism along the X axis.

[0033] In the above nozzle, a feed hole that is distributed along the X axis and communicates with the first compression hole is provided on the feed core block, and the aperture of the feed hole is larger than the aperture of the first compression hole of the nozzle atomization mechanism.

[0034] In the above nozzle, an installation through hole that is distributed along the X axis is provided on the nozzle body. From the feed direction to the spraying direction, the nozzle atomization mechanism and the atomizing nozzle head are sequentially installed in the installation through hole.

[0035] Compared with the existing technology, the advantages of the present application are as follows:

[0036] The expansion chamber feeds with a small diameter communicating with the first compression hole, and discharges with a small diameter communicating with the second compression hole. The ejecta compressed from the first compression hole enters the first tapered hole of the expansion chamber. At this time, the ejection area of the ejecta expands by at least more than twice the area ejected from the first compression hole, and is in a wide-angle ejection and atomization state; the atomized ejecta is deflected as it contacts the second tapered hole. At the same time, a part of the ejecta is refluxed due to the reflux in the wedge-shaped reflux zone. At this time, the ejecta passes through the reflux and contacts the hole wall of the first compression hole and is ejected again with the ejecta ejected from the first compression hole. In the above process, the wedge-shaped reflux zone causes a circular reflux state to be formed inside the expansion chamber during the ejection process, so that the ejecta is fully and uniformly atomized in the expansion chamber A, and uniform atomization is achieved at a low cost.

[0037] The combination of the first tapered hole, the second tapered hole, and the expansion chamber enables uniform atomization spraying to be achieved at a low pressure of 1000-1500 psi. The lower pressure extends the service life of the spraying nozzle and also solves the problem of overspray of the coating material. Brief Description of the Drawings

[0038] Figure 1 is a schematic diagram of the nozzle structure provided by the present invention.

[0039] Figure 2 is Figure 1 a partial structure schematic diagram in

[0040] Figure 3 is a schematic diagram of the pre-expansion member structure provided by the present invention.

[0041] Figure 4 is a schematic diagram of the second core block structure provided by the present invention.

[0042] Figure 5 is a schematic diagram of the nozzle atomization mechanism structure provided by the present invention.

[0043] Figure 6 is a schematic diagram of another nozzle atomization mechanism structure provided by the present invention.

[0044] Figure 7 is a three-dimensional structure schematic diagram of the atomizing spray head provided by the present invention.

[0045] Figure 8 is a schematic diagram of the atomizing spray head structure from another perspective provided by the present invention.

[0046] Figure 9 is a schematic diagram of the atomizing spray head structure provided by the present invention.

[0047] Figure 10 is a state diagram after atomizing spraying provided by the present invention.

[0048] Figure 11 is a schematic diagram of the structure of Embodiment 2 provided by the present invention.

[0049] Figure 12 is a schematic diagram of the structure of Embodiment 3 provided by the present invention.

[0050] Figure 13 is a schematic diagram of the structure of Embodiment 4 provided by the present invention.

[0051] Figure 14 is a schematic diagram of the structure of Embodiment 6 provided by the present invention.

[0052] Figure 15 is a schematic diagram of the structure of Embodiment 7 provided by the present invention.

[0053] Figure 16 is a schematic diagram of the structure of Embodiment 8 provided by the present invention.

[0054] Figure 17 is a schematic diagram of the structure of Embodiment 9 provided by the present invention.

[0055] In the figure, there are a nozzle atomization mechanism 1, a pre-expansion part 10, a first tapered hole 100, a first compression hole 101, a second core block 11, a second tapered hole 110, a second compression hole 111, a raw material expansion part 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, an installation through hole 20, a feed core block 3, a feed hole 30, a core block installation hole 31, an atomizing spray head 4, an atomizing turbulent flow chamber 40, an outlet hole 41, an atomizing port 42, an expansion chamber A, a wedge-shaped reflux area A1, a first acute angle a1, and a second acute angle a2. Detailed implementation mode

[0056] The following are specific embodiments of the invention and in combination with the attached drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments. Embodiment 1

[0057] As Figure 1 and Figure 2 shown, the present nozzle atomization mechanism includes a pre-expansion part 10 and a post-treatment part that are hermetically abutted in sequence from the feed direction to the spraying direction. A first tapered hole 100 distributed along the X-axis is provided on the pre-expansion part 10, and a post-treatment hole communicating with the first tapered hole 100 is provided on the post-treatment part. The aperture of the large-diameter end of the first tapered hole 100 is larger than the aperture of the post-treatment hole, and a wedge-shaped reflux area A1 is formed at the through-hole of the first tapered hole 100 and the post-treatment hole.

[0058] Specifically, the post-treatment part of this embodiment includes a second core block 11. From the feed direction to the spraying direction, the feed core block 3, the pre-expansion part 10, and the second core block 11 are hermetically abutted in sequence, that is, the spraying material enters the second core block 11 from the feed core block 3 and the pre-expansion part 10.

[0059] Of course, both the pre-expansion part 10 and the second core block 11 of this embodiment are circular blocks to facilitate the installation of the mounting holes, and square blocks can also be selected.

[0060] From the feed direction to the spraying direction, the two end faces of the pre-expansion part 10 are parallel to each other. One end face of the feed core block 3 close to the pre-expansion part 10 coincides with one end face of the pre-expansion part 10 close to the feed 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 part 10 close to the second core block 11 coincides and abuts against the corresponding end face of the second core block 11 to achieve hard annular surface contact sealing.

[0061] A feed hole 30 distributed along the X-axis is provided on the feed core block 3, and the feed hole 30 communicates with the first compression hole 101. In a preferred manner, the aperture of the feed hole 30 is smaller than the aperture of the first compression hole 101.

[0062] Diametrically, the diameter of the pre-expansion member 10 is equal to the diameter of the second pellet 11, and the equal diameters facilitate installation; in terms of thickness, the thickness of the pre-expansion member 10 is less than the thickness of the second pellet 11. Increasing the thickness of the pre-expansion member or enhancing its hardness can provide a longer service life.

[0063] As Figures 2 - 6 shown, on the pre-expansion member 10, there are a first tapered hole 100 distributed along the X-axis and a first compression hole 101 connected to the small-diameter end of the first tapered hole 100. Here, it can be understood that the axis of the first tapered hole 100 coincides with the axis of the first compression hole 101. On the second pellet 11, there are a second tapered hole 110 distributed along the X-axis and a second compression hole 111 connected to the small-diameter end of the second tapered hole 110. The axis of the second tapered hole 110 coincides with the axis of the second compression hole 111.

[0064] The wall of the first tapered hole 100 forms a first acute angle a1 with the X-axis, and the wall of the second tapered hole 110 forms a second acute angle a2 with the X-axis. The first tapered hole 100 and the second tapered hole 110 communicate with each other and form an expansion chamber A with a gradually decreasing aperture from the middle to both ends. The aperture of the large-diameter end of the first tapered hole 100 is larger than the aperture of the large-diameter end of the second tapered hole 110, and a wedge-shaped reflux zone A1 is formed in the middle of the expansion chamber A. The wedge shape can be understood as a triangle.

[0065] The expansion chamber A feeds in with a small diameter connected to the first compression hole 101 and discharges with a small diameter connected to the second compression hole 111. The ejecta compressed from the first compression hole 101 enters the first tapered hole 100 of the expansion chamber A. At this time, the ejection area of the ejecta expands by at least more than twice the area ejected from the first compression hole 101, and it is in a wide-angle ejection and atomization state; the atomized ejecta is compressed, accelerated, and guided as it contacts the second tapered hole 110. At the same time, a part of the ejecta is refluxed due to the wedge-shaped reflux zone A1. At this time, the ejecta undergoes reflux, contacts the wall of the first compression hole 101, and is ejected again with the ejecta ejected from the first compression hole 101. In the above process, the wedge-shaped reflux zone causes a circumferential (radial 360°) reflux state to be formed inside the expansion chamber A during the ejection process, so that the ejecta is fully and evenly atomized in the expansion chamber A, achieving uniform atomization in a low-cost state. For the specific spraying effect, see Attachment Figure 10 Attachment Figure 10 For the long side and short side of the spraying surface in the attachment, compared with the middle area enclosed by the long side and short side, there is no obvious thick black dense area.

[0066] Secondly, as Figure 6As shown in the figure, the first acute angle α1 formed by the hole wall of the first tapered hole 100 of the present application and the X-axis is greater than the second acute angle α2 formed by the hole wall of the second tapered hole 110 and the X-axis. The combination of the above structure and the expansion chamber A enables uniform atomization spraying to be achieved at a low pressure of 1000 - 1500 psi. Having a lower pressure extends the service life of the spray nozzle and also solves the problem of overspray of the coating material.

[0067] As Figure 2 shown, the aperture of the first compression hole 101 is 1 / 3 - 1 / 5 of the aperture of the second compression hole 111. For example, the aperture of the first compression hole 101 is 0.4 - 0.8 mm. The axial hole length of the first compression hole 101 is less than the axial length of the expansion chamber A along the X-axis, and the axial length of the first compression hole 101 is less than the axial length of the second compression hole 111. This is to extend the atomization time in the expansion chamber A and improve the atomization uniformity.

[0068] During the spraying process, the compression holes with a smaller front and a larger rear, and the compression holes with a shorter front and a longer rear, utilize the high-speed pressure of the first compression hole to enter, then perform pre-atomization, and finally are compressed by the second compression hole and discharged to the atomizing nozzle head 4 at the very front.

[0069] Preferably, the first tapered hole 100 of this embodiment is any one of a conical hole and a polygonal tapered hole. And the second tapered hole 110 is any one of a conical hole and a polygonal tapered hole.

[0070] The axial lengths of the first tapered hole 100 and the second tapered hole 110 are equal; or the axial length of the second tapered hole 110 is longer than the axial length of the first tapered hole 100. Keeping the axial lengths consistent or slightly longer enables the expansion atomization and the atomization expansion speed to be accelerated. Embodiment Two

[0071] As Figure 11 shown, the structure and principle of this embodiment are basically the same as those of Embodiment One. The different structure lies in that: the aperture of the large-diameter end of the first tapered hole 100 is smaller than the aperture of the large-diameter end of the second tapered hole 110 and a wedge-shaped reflux zone A1 is formed in the middle of the expansion chamber A. At this time, the first acute angle α1 is smaller than the second acute angle α2. Embodiment Three

[0072] As Figure 12 shown, the structure and principle of this embodiment are basically the same as those of Embodiment One. The different structure lies in that: the first acute angle α1 formed by the hole wall of the first tapered hole 100 of the present application and the X-axis is equal to the second acute angle α2 formed by the hole wall of the second tapered hole 110 and the X-axis. Embodiment Four

[0073] The structure and principle of this embodiment are basically the same as those of the first embodiment. The different structure lies in:

[0074] As Figure 13 shown, the nozzle atomization mechanism further includes a feed core block 3. On the feed core block 3, there are feed holes 30 distributed along the X-axis, and a core block mounting hole 31 communicating with the feed holes 30. The aperture of the feed holes 30 is smaller than the aperture of the core block mounting hole 31. The pre-expansion member 10 and the second core block 11 are installed in the core block mounting hole 31 and the feed holes 30 communicate with the first compression hole 101.

[0075] Under the action of the above structure, the pre-expansion member 10 and the second core block 11 are pre-received and fixed in the core block mounting hole 31 of the feed core block 3 at this time, so that the three components form a single module. Finally, this module is assembled at the set position to improve efficiency. At the same time, the above structure can also ensure the concentricity of the first compression hole 101, the first tapered hole 100, the second tapered hole 110 and the second compression hole, so as to improve the spraying uniformity.

[0076] Secondly, the end face of the pre-expansion member 10 close to the first compression hole 101 is conformable to the bottom surface of the core block mounting hole 31. At the same time, the end face of the second core block 11 away from the pre-expansion member 10 is flush with the orifice of the core block mounting hole 31 away from the first compression hole 101. The above structure can make the end face of the feed core block 3 away from the first compression hole 101 and the end face of the second core block 11 away from the pre-expansion member 10 form a common hard contact sealing surface to improve the sealing performance.

[0077] That is to say, a section with the core block mounting hole 31 has a certain wall thickness portion 32. The wall thickness portion 32 is sleeved on the pre-expansion member 10 and the second core block 11, so that the pre-expansion member 10, the second core block 11 and the feed core block 3 form an integral body. Embodiment Five

[0078] As Figure 1 shown, this embodiment provides a nozzle including the nozzle atomization mechanism 1 of any one of the first to fourth embodiments. And this nozzle further includes a nozzle body 2. On the nozzle body 2, there are the nozzle atomization mechanism 1 and the atomizing nozzle head 4 that are hermetically abutted in sequence from the feed to the spraying direction. As Figures 7 - 9 shown, the atomizing nozzle head 4 includes an atomizing turbulent flow chamber 40, an outlet hole 41 and an atomizing orifice 42 that are distributed in sequence along the X-axis. The atomizing turbulent flow chamber 40 communicates with the second compression hole 111 of the nozzle atomization mechanism 1 and the aperture of the atomizing turbulent flow chamber 40 is larger than the aperture of the second compression hole 111. The atomizing orifice 42 is a pointed nozzle atomizing orifice and the spraying angle is 40°.

[0079] The design of the aperture difference enables the pre-atomized ejecta to be further atomized and turbulent after entering the atomizing turbulent flow chamber 40, so as to make the final ejecta spraying uniformity.

[0080] The length of the atomization turbulent flow chamber 40 along the X-axis is longer than the length of the expansion chamber A of the nozzle atomization mechanism 1 along the X-axis, so as to provide sufficient turbulent atomization for the pre-atomized ejecta.

[0081] As Figure 2 shown, a feed hole 30 is provided on the feed core block 3, which is distributed along the X-axis and communicates with the first compression hole 101. The aperture of the feed hole 30 is larger than the aperture of the first compression hole 101 of the nozzle atomization mechanism 1. The above-mentioned different aperture designs of the feed hole 30 and the first compression hole 101 can enable the first compression hole 101 to have stronger compression performance, and the axial length of the feed hole 30 is longer than the axial length of the first compression hole 101. For example, the axial length of the feed hole 30 is at least twice the axial length of the first compression hole 101. This gap exists, so that the feed hole 30 has enough space to form turbulent flow for the feed. For example, as Figure 5 shown, turbulent threads are provided on the pore wall of the feed hole 30.

[0082] The following are two fixing schemes:

[0083] The first one: As Figure 1 and Figure 2 shown, mounting through holes 20 distributed along the X-axis are provided on the nozzle body 2. From the feed direction to the ejection direction, the nozzle atomization mechanism 1 and the atomization spray head 4 are sequentially installed in the mounting through holes 20.

[0084] The nozzle atomization mechanism 1 and the atomization spray head 4 can be connected to the mounting through holes 20 by an interference fit method. That is, the feed core block 3, the pre-expansion part 10 and the second core block 11 of the nozzle atomization mechanism 1 are respectively fixed by interference fit with the mounting through holes 20.

[0085] The second one: As Figure 13 shown, the pre-expansion part 10 and the second core block 11 are received in the core block mounting hole 31, and at this time the feed core block 3 is fixed in the mounting through hole 20 by an interference fit. Embodiment Six

[0086] The working principle and structure of this embodiment are basically the same as those of Embodiment One. The different structure lies in:

[0087] As Figure 14 shown, the post-treatment part includes an atomization spray head 4. An atomization turbulent flow chamber 40 communicating with the large-diameter end of the first tapered hole 100 is provided in the atomization spray head 4. The aperture of the large-diameter end of the first tapered hole 100 is larger than the inner diameter of the atomization turbulent flow chamber 40, and a wedge-shaped recirculation zone A1 is formed at the through-hole of the first tapered hole 100 and the atomization turbulent flow chamber 40.

[0088] The small-diameter end of the first tapered hole 100 is connected with a first compression hole 101. The first compression hole 101 is a circular hole or a through-hole of other shapes.

[0089] Moreover, the nozzle atomization mechanism of this embodiment further includes a raw material expansion member 12 having a raw material expansion chamber 120. The axial discharge port of the raw material expansion chamber 120 is communicated with the first compression hole 101, and the inner diameter of the raw material expansion chamber 120 is larger than the aperture of the first compression hole 101. A raw material feed hole 121 is provided at the 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. The aperture of the raw material feed hole 121 is smaller than the inner diameter of the raw material expansion chamber 120. The raw material feed hole 121 is a circular hole. Of course, threads can be processed on the hole wall of the raw material feed hole 121 to form a turbulent flow effect.

[0090] The combination of the raw material expansion chamber 120 and the raw material feed hole 121 forms a primary expansion of the raw material, while the first compression hole 101 compresses the expanded raw material to increase the injection pressure.

[0091] A spacer sleeve 13 is provided in the raw material expansion chamber 120. The inner diameter of the spacer sleeve 13 is larger than the aperture of the first compression hole 101, and the inner diameter of the spacer sleeve 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 abuts against the spacer sleeve 13.

[0092] Spacer sleeves 13 with different inner diameters can be replaced to meet different expansion requirements.

[0093] This embodiment is applicable to the uniform injection of viscous liquids. Embodiment Seven

[0094] As Figure 15 shown, the working principle and structure of this embodiment are basically the same as those of Embodiment Six. The different structure lies in that: a step groove 122 is provided at one end of the raw material expansion chamber 120 away from the raw material feed hole 121, and the pre-expansion member 10 is fixed in the step groove 122. The above solution can make the pre-expansion member 10 and the raw material expansion member 12 form a modular whole, which is beneficial to the installation and disassembly of the entire module.

[0095] 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 step groove 122 is provided. Embodiment Eight

[0096] As Figure 16 shown, based on Embodiment Seven, this embodiment further provides that a first gasket 14 is provided between the plane perpendicular to the X-axis of the pre-expansion member 10 and the step groove 122, and a first through hole 140 communicating the raw material expansion chamber 120 and the first compression hole 101 is provided on the first gasket 14.

[0097] The aperture diameter of the first through hole 140 is equal to the inner diameter of the raw material expansion chamber 120; or the aperture diameter of the first through hole 140 is smaller than the inner diameter of the raw material expansion chamber 120, and the aperture diameter of the first through hole 140 is larger than the aperture diameter of the first compression hole 101; different first gaskets 14 are replaced to meet different pressure spraying requirements. Embodiment Nine

[0098] As Figure 17 shown, based on Embodiment Eight, this embodiment further provides a second gasket 15 disposed at the notch of the step groove 122 and abutted against the pre-expansion member 10. A second through hole 150 having the same aperture diameter as the large-diameter end of the first tapered hole 100 is disposed on the second gasket 15. One end face of the second gasket 15 away from the pre-expansion member 10 is flush with one end face of the raw material expansion member 12 provided with the step groove 122. Embodiment Ten

[0099] This embodiment provides a spray gun and a spraying device using the spray gun. The spray gun and the spraying device are both commercially available products. This embodiment will not further elaborate on their structures. The nozzle in the spray gun includes the nozzle atomization mechanism or nozzle of any one of Embodiments One to Nine.

[0100] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. Nozzle atomization mechanism, characterized in that, The nozzle atomization mechanism includes a pre-expansion member (10) and a post-treatment member that are hermetically abutted in sequence from the feeding direction to the spraying direction. A first tapered hole (100) distributed along the X-axis is provided on the pre-expansion member (10). A post-treatment hole communicating with the first tapered hole (100) is provided on the post-treatment member. The aperture of the large-diameter end of the first tapered hole (100) is larger than the aperture of the post-treatment hole, and a wedge-shaped reflux zone (A1) is formed at the through portion of the first tapered hole (100) and the post-treatment hole; The post-treatment member includes an atomizing spray head (4). An atomizing turbulent flow chamber (40) communicating with the large-diameter end of the first tapered hole (100) is provided in the atomizing spray head (4). The aperture of the large-diameter end of the first tapered hole (100) is larger than the inner diameter of the atomizing turbulent flow chamber (40), and the wedge-shaped reflux zone (A1) is formed at the through portion of the first tapered hole (100) and the atomizing turbulent flow chamber (40); The small-diameter end of the first tapered hole (100) is connected to a first compression hole (101); The nozzle atomization mechanism further includes a raw material expansion member (12) having a raw material expansion chamber (120). The axial discharge port of the raw material expansion chamber (120) communicates with the first compression hole (101), and the inner diameter of the raw material expansion chamber (120) is larger than the aperture of the first compression hole (101). A raw material feed hole (121) is provided at the 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 feeding direction to the spraying direction. The aperture of the raw material feed hole (121) is smaller than the inner diameter of the raw material expansion chamber (120).

2. The nozzle atomization mechanism according to claim 1, characterized in that, The post-treatment member includes a second core block (11). A second tapered hole (110) distributed along the X-axis is provided on the second core block (11). The first tapered hole (100) and the second tapered hole (110) communicate to form an expansion chamber (A) with the aperture gradually decreasing from the middle to both ends. The aperture of the large-diameter end of the first tapered hole (100) is larger than the aperture of the large-diameter end of the second tapered hole (110), and the wedge-shaped reflux zone (A1) is formed in the middle of the expansion chamber (A).

3. The nozzle atomization mechanism according to claim 2, wherein, One end face of the second core block (11) close to the pre-expansion member (10) and the partial hole wall of the large-diameter end of the first tapered hole (100) form the wedge-shaped reflux zone (A1).

4. The nozzle atomization mechanism according to claim 2, characterized in that, The small-diameter end of the first tapered hole (100) is connected to a first compression hole (101). A second compression hole (111) is connected to the small-diameter end of the second tapered hole (110). The aperture of the first compression hole (101) is smaller than the aperture of the second compression hole (111).

5. The nozzle atomization mechanism according to claim 4, characterized in that, The axial hole length of the first compression hole (101) is smaller than the axial length of the expansion chamber (A) along the 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 atomization mechanism according to claim 2, wherein, The first tapered hole (100) is any one of a conical hole and a polygonal tapered hole; the second tapered hole (110) is any one of a conical hole and a polygonal tapered hole.

7. The nozzle atomization mechanism according to claim 4, characterized in that The nozzle atomization mechanism further includes a feed core block (3), on which a feed hole (30) is provided along the X-axis, and the feed hole (30) communicates with the first compression hole (101).

8. The nozzle atomization mechanism according to claim 4, characterized in that, The nozzle atomization mechanism further includes a feed core block (3), on which a feed hole (30) is provided along the X-axis, and a core block mounting hole (31) communicating with the feed hole (30). The aperture of the feed hole (30) is smaller than that of the core block mounting hole (31). The pre-expansion member (10) and the second core block (11) are installed in the core block mounting hole (31), and the feed hole (30) communicates with the first compression hole (101).

9. The nozzle atomization mechanism according to claim 1, wherein, A spacer sleeve (13) is provided in the raw material expansion chamber (120). The inner diameter of the spacer sleeve (13) is larger than the aperture of the first compression hole (101), and the inner diameter of the spacer sleeve (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 sleeve (13).

10. The nozzle atomization mechanism according to claim 1, wherein, A stepped groove (122) is provided at one end of the raw material expansion chamber (120) away from the raw material feed hole (121), and the pre-expansion member (10) is fixed in the stepped groove (122).

11. The nozzle atomization mechanism according to claim 10, characterized in 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. A first through hole (140) for penetrating the raw material expansion chamber (120) and the first compression hole (101) is provided on the first gasket (14).

12. The nozzle atomization mechanism according to claim 11, wherein The aperture of the first through hole (140) is equal to the inner diameter of the raw material expansion chamber (120).

13. The nozzle atomization mechanism according to claim 11, wherein, 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).

14. The nozzle atomization mechanism according to claim 12, wherein A second gasket (15) abutting against the pre-expansion member (10) is provided at the notch of the stepped groove (122). A second through hole (150) having the same aperture as the large-diameter end of the first tapered hole (100) is provided on the second gasket (15).

15. Nozzle, characterized in that, The nozzle includes the nozzle atomization mechanism (1) according to any one of claims 7 or 8.

16. The nozzle according to claim 15, characterized in that, The nozzle further includes a nozzle body (2). A nozzle atomization mechanism (1) and an atomizing nozzle head (4) which are hermetically abutted in sequence from the feed direction to the spraying direction are provided on the nozzle body (2). The atomizing nozzle head (4) includes an atomizing turbulent flow chamber (40), an outlet hole (41), and an atomizing port (42) which are sequentially distributed along the X-axis. The atomizing turbulent flow chamber (40) communicates with the second compression hole (111) of the nozzle atomization mechanism (1), and the aperture of the atomizing turbulent flow chamber (40) is larger than that of the second compression hole (111).

17. The nozzle according to claim 16, characterized in that, The length of the atomizing turbulent flow chamber (40) along the X-axis is longer than the length of the expansion chamber (A) of the nozzle atomization mechanism (1) along the X-axis.

18. The nozzle according to claim 16, characterized in that, The feed pellet (3) is provided with a feed hole (30) distributed along the X-axis and communicating with the first compression hole (101). Turbulent threads are provided on the hole wall of the feed hole (30), and the aperture of the feed hole (30) is larger than the aperture of the first compression hole (101) of the nozzle atomization mechanism (1).

19. The nozzle according to claim 16, wherein, The nozzle body (2) is provided with a mounting through hole (20) distributed along the X-axis; from the feed direction to the spraying direction, the nozzle atomization mechanism (1) and the atomizing nozzle head (4) are sequentially installed in the mounting through hole (20).

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