A monodisperse oily aerosol generating nozzle

Abstract

The invention discloses a monodisperse oil aerosol generating nozzle, comprising an impact ring body and a nozzle inner body; a through hole is formed in the impact ring body, and a flow discharge port is provided on the peripheral wall of the impact ring body; the nozzle inner body is penetrated in the through hole, and a gap for fluid circulation and an aerosol outlet are formed between the inner wall of the impact ring body and the outer wall of the nozzle inner body, and a gas flow channel, a liquid flow channel and a gas-liquid acceleration flow channel are provided inside the nozzle inner body, and the gas-liquid acceleration flow channel is connected with the gas flow channel and the liquid flow channel respectively, and a collision distance D is formed between the outlet of the gas-liquid acceleration flow channel and the inner wall of the impact ring body; the outlet of the gas-liquid acceleration flow channel is located between the flow discharge port and the aerosol outlet, and the flow discharge port, the aerosol outlet and the gap are connected. The monodisperse aerosol generated by the nozzle can meet the standard requirements and help improve the detection accuracy of the mask filtering effect.

Description

Technical Field

[0001] The invention relates to the technical field of particle filtration detection, and in particular to a monodisperse oily aerosol generating nozzle. Background Art

[0002] At present, the measurement of mask filtration efficiency mainly uses oily aerosol or saline aerosol as the detected medium. The detection host extracts the aerosol by setting the flow rate, so that the aerosol passes through the detected mask. At this time, the host calculates the mask filtration efficiency by detecting the aerosol concentration before and after passing through the mask. Because the filtration efficiency of the mask is directly related to the aerosol particle size distribution, the "GB2626-2019 Respiratory Protective Equipment-Self-priming Filter-type Anti-particulate Respirator" has the following provisions: the CMD of the oily aerosol count is (0.185±0.02)um (the converted aerodynamic median diameter MMAD is about 0.3um), and the geometric standard deviation of the particle size distribution is not greater than 1.60.

[0003] Currently, the main methods for generating oily aerosols on the market are laskin nozzles or collison nozzles. Experimental measurements have shown that the geometric standard deviations of aerosols generated by the two nozzles are greater than 2.0, which is a polydisperse system that cannot meet the current standard requirements and reduces the accuracy of mask filtration efficiency testing.

[0004] The above information disclosed in the background technology is only used to increase the understanding of the background technology of the present application, and therefore, it may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] In response to the problems pointed out in the background technology, the present invention proposes a monodisperse oily aerosol generating nozzle, which produces a monodisperse aerosol that can meet the standard requirements and improve the detection accuracy of the mask filtering effect.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] The present invention provides a monodisperse oily aerosol generating nozzle, comprising:

[0008] An impact ring body is formed with a through hole therein, and a drain port is provided on the peripheral wall of the impact ring body;

[0009] The nozzle inner body is penetrated in the through hole, a gap for fluid circulation and an aerosol outlet are formed between the inner wall of the impact ring body and the outer wall of the nozzle inner body, a gas flow channel, a liquid flow channel and a gas-liquid acceleration flow channel are arranged inside the nozzle inner body, the gas-liquid acceleration flow channel is communicated with the gas flow channel and the liquid flow channel respectively, and a collision distance D is formed between the outlet of the gas-liquid acceleration flow channel and the inner wall of the impact ring body;

[0010] Wherein, the outlet of the gas-liquid accelerating flow channel is located between the leakage port and the aerosol outlet, and the leakage port, the aerosol outlet and the gap are connected.

[0011] In some embodiments of the present application, the gas-liquid acceleration channel and the axis of the impact ring are perpendicular to each other.

[0012] In some embodiments of the present application, the gas flow channel and the liquid flow channel are perpendicular to each other, and the gas flow channel and the gas-liquid acceleration flow channel are coaxial.

[0013] In some embodiments of the present application, a gas inlet is provided at one end of the inner body of the nozzle, the gas inlet is communicated with the gas flow channel, and the gas inlet is externally connected to a gas pipe;

[0014] A liquid inlet is provided at the other end of the nozzle inner body, the liquid inlet is communicated with the liquid flow channel, and the liquid inlet is externally connected to a liquid pipe assembly.

[0015] In some embodiments of the present application, the liquid pipe assembly includes a silicone tube and a liquid pipe connected to the silicone tube, and the silicone tube is threadedly connected to the liquid inlet.

[0016] In some embodiments of the present application, there are multiple drain ports, and the multiple drain ports are evenly spaced along the peripheral wall of the impact ring body.

[0017] In some embodiments of the present application, the through hole includes a first through hole section and a second through hole section that are connected, the inner diameter of the first through hole section is larger than the inner diameter of the second through hole section, and a first step portion is formed between the first through hole section and the second through hole section;

[0018] Correspondingly, the nozzle inner body comprises a nozzle inner body section one and a nozzle inner body section two of an integral structure, the outer diameter of the nozzle inner body section one is greater than the outer diameter of the nozzle inner body section two, and a second step portion is formed between the nozzle inner body section one and the nozzle inner body section two;

[0019] The first section of the through hole is excessively matched with the first section of the nozzle inner body, the gap is formed between the second section of the through hole and the second section of the nozzle inner body, and the first step portion abuts against the second step portion.

[0020] In some embodiments of the present application, a first threaded hole is provided on the peripheral wall of the impact ring body where the through hole section is located, and a second threaded hole is correspondingly provided on a section of the nozzle inner body, and a screw is inserted between the first threaded hole and the second bolt hole.

[0021] In some embodiments of the present application, the first step portion has a portion that intersects and connects with the drain port.

[0022] In some embodiments of the present application, a through opening is provided on the peripheral wall of the impact ring body, and an adjusting plug is provided in the through opening. The adjusting plug is directly opposite to the outlet of the gas-liquid acceleration channel, and the impact distance D formed between the outlet of the gas-liquid acceleration channel and the adjusting plug is adjustable.

[0023] In some embodiments of the present application, a hand-tightening portion is provided at one end of the adjusting plug, and the hand-tightening portion extends outward from the impact ring body.

[0024] Compared with the prior art, the advantages and positive effects of the present invention are:

[0025] In the monodisperse oil aerosol generating nozzle disclosed in the present application, the high-pressure gas entering from the gas flow channel and the oil solution entering from the liquid flow channel are mixed into a gas-liquid mixed fluid, which is then accelerated through the gas-liquid acceleration flow channel to collide with the inner wall of the impact ring to form nano-scale aerosol particles, and large-sized aerosol particles and unbroken oil droplets flow downward through the gap to the discharge port and are discharged through the discharge port. Small-sized aerosol particles will rise to the aerosol outlet, and after a period of time, a layer of oil film will be formed at the aerosol outlet. This oil film will capture small-sized aerosol particles, so that the particle size discharged from the aerosol outlet is uniform and meets the requirements of the test standard. Monodisperse oil aerosol.

[0026] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 is an exploded view of a monodisperse oil aerosol generating nozzle according to an embodiment;

[0029] Figure 2 is a cross-sectional view of a monodisperse oil aerosol generating nozzle according to an embodiment;

[0030] Figure 3 is a cross-sectional view of the monodisperse oil aerosol generating nozzle after being assembled with the air pipe and the liquid pipe according to the embodiment;

[0031] Figure 4 is a cross-sectional view of a nozzle inner body according to an embodiment;

[0032] Figure 5 is a cross-sectional view of an impact ring according to an embodiment;

[0033] Figure 6 is a cross-sectional view of an impact ring according to another embodiment;

[0034] Figure 7 is a cross-sectional view of an adjustment plug according to an embodiment;

[0035] Figure 8 is a side view of an adjustment plug according to an embodiment.

[0036] Reference numerals:

[0037] 100-impact ring body, 110-through hole, 111-through hole section 1, 112-through hole section 2, 120-drain port, 130-stop portion, 140-first threaded hole, 150-first step portion, 160-through port;

[0038] 200- nozzle inner body, 210- gas flow channel, 220- liquid flow channel, 230- gas-liquid acceleration flow channel, 240- gas inlet, 250- liquid inlet, 260- second threaded hole, 270- second step portion, 280- nozzle inner body section 1, 290- nozzle inner body section 2;

[0039] 300 - trachea;

[0040] 400-liquid pipe assembly, 410-liquid pipe, 420-silicone pipe;

[0041] 500-screws;

[0042] 600-adjustable plug, 610-hand-tightening part;

[0043] 700-aerosol outlet;

[0044] 800-gap;

[0045] D1-outer diameter of the second section of the nozzle inner body;

[0046] D2-inner diameter of the stopper;

[0047] D3-inner diameter of the second section of the through hole;

[0048] D-Impact distance. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0051] The monodisperse oil aerosol generating nozzle in this embodiment can be applied to the field of filtration detection of respiratory protective equipment (such as masks) to generate monodisperse oil aerosol with uniform particle size distribution that meets the requirements of test standards.

[0052] Embodiment 1

[0053] Reference Figure 1 and Figure 2 The monodisperse oil aerosol generating nozzle in this embodiment mainly includes an impact ring body 100 and a nozzle inner body 200. The impact ring body 100 and the nozzle inner body 200 are split structures, which are easy to disassemble and assemble.

[0054] The cross-sectional view of the impact ring 100 is shown in FIG. Figure 4 The impact ring body 100 is a cylindrical hollow structure with a through hole 110 formed therein. A drain port 120 is provided on the peripheral wall of the impact ring body 100 , and the drain port 120 is communicated with the through hole 110 .

[0055] The cross-sectional view of the nozzle inner body 200 is shown in FIG. Figure 5 , combined with Figure 2 The nozzle inner body 200 is penetrated in the through hole 110. A gap 800 for fluid circulation and an aerosol outlet 700 are formed between the inner wall of the impact ring body 100 and the outer wall of the nozzle inner body 200. A gas flow channel 210, a liquid flow channel 220 and a gas-liquid acceleration flow channel 230 are provided inside the nozzle inner body 200. The gas-liquid acceleration flow channel 230 is connected to the gas flow channel 210 and the liquid flow channel 220 respectively. A collision distance D is formed between the outlet of the gas-liquid acceleration flow channel 230 and the inner wall of the impact ring body 100.

[0056] The outlet of the gas-liquid accelerating flow channel 230 is located between the leakage port 120 and the aerosol outlet 700 , and the leakage port 120 , the aerosol outlet 700 and the gap 800 are connected.

[0057] The process of generating monodisperse oily aerosol is as follows: high-pressure gas enters the gas Q1 flow channel 210, and the oil solution Q2 enters the liquid flow channel 220. The high-pressure gas Q1 and the oil solution Q2 are mixed to form a gas-liquid mixed fluid Q3. The gas-liquid mixed fluid Q3 is accelerated in the gas-liquid acceleration flow channel 230, and is ejected from the outlet of the gas-liquid acceleration flow channel 230 to impact the inner wall of the impact ring 100. The impact distance of the gas-liquid mixed fluid Q3 is D. The impact of the gas-liquid mixed fluid Q3 causes the oily droplets to break and form nano-scale aerosol particles. Large-diameter aerosol particles and unbroken oily droplets flow downward to the drain port 120 through the gap 800 and are discharged through the drain port 120. The small-sized aerosol particles will rise to the aerosol outlet 700, and after a period of time, an oil film will be formed at the aerosol outlet 700. This oil film will capture the small-sized aerosol particles, so that the aerosol finally discharged from the aerosol outlet 700 is a small-sized monodisperse oily aerosol with uniform particle size, which meets the test requirements, thereby improving the accuracy of mask filtration detection.

[0058] In some embodiments of the present application, a stopper 130 is formed between the gap 800 and the aerosol outlet 700. Some large-sized aerosol particles may rise to the aerosol outlet 700 together with small-sized aerosol particles. At this time, the stopper 130 has an impact-blocking effect on these large-sized aerosol particles, thereby further improving the particle size uniformity of the aerosol particles flowing out of the aerosol outlet 700.

[0059] In some embodiments of the present application, refer to Figure 5 The through hole 110 includes a first through hole section 111 and a second through hole section 112 which are connected. The inner diameter of the first through hole section 111 is greater than the inner diameter of the second through hole section 112 . A first step portion 150 is formed between the first through hole section 111 and the second through hole section 112 .

[0060] Corresponding, refer to Figure 4 The nozzle inner body 200 includes a nozzle inner body section 1 280 and a nozzle inner body section 290 of an integral structure. The outer diameter of the nozzle inner body section 1 280 is greater than the outer diameter of the nozzle inner body section 290 , and a second step portion 270 is formed between the nozzle inner body section 1 280 and the nozzle inner body section 290 .

[0061] Reference Figure 2 A gap 800 is formed between the second section of the through hole 112 and the second section of the nozzle inner body 290; the first section of the through hole 111 is over-fitted with the first section of the nozzle inner body 280; the first step portion 150 abuts against the second step portion 270, and the abutment between the two plays a role in pre-positioning of the installation, prompting the nozzle inner body 200 to be pushed into place.

[0062] In this embodiment, in order to further improve the connection reliability between the impact ring body 100 and the nozzle inner body 200, a first threaded hole 140 is provided on the peripheral wall of the impact ring body 100 where the through hole section 111 is located, and a second threaded hole 260 is correspondingly provided on the nozzle inner body section 280, and a screw 500 is passed between the first threaded hole 140 and the second threaded hole 260. The connection structure is simple and easy to disassemble and assemble.

[0063] In some embodiments of the present application, refer to Figure 2 and Figure 5 The stopper 130 is an annular protrusion arranged on the inner wall of the impact ring body 100 near the first through hole section 111, that is, the stopper 130 is arranged on the inner wall of the second through hole section 112, and an aerosol outlet 700 is formed between the stopper 130 and the second nozzle inner body section 290.

[0064] For ease of description, the outer diameter of the second section 290 of the nozzle inner body is defined as D1, and the inner diameter of the stopper 130 is defined as D2. The opening gap of the aerosol outlet 700 is defined as D2-D1, and the opening gap of the aerosol outlet 700 is also the distance for forming the oil film. The inner diameter of the second section 112 of the through hole is defined as D3, and D3>D2, and the impact distance D=D3-D1.

[0065] After the nozzle inner body 200 is installed in the impact ring body 100, a gap 800 and an aerosol outlet 700 are naturally formed, and the structure is simple and compact.

[0066] In some embodiments of the present application, refer to Figure 2 The gas-liquid accelerating channel 230 and the axis of the impact ring 100 are perpendicular to each other, which helps to improve the impact effect of the gas-liquid mixed fluid and improve the quality of the generated aerosol particles.

[0067] In some embodiments of the present application, continue to refer to Figure 2 The gas flow channel 210 and the liquid flow channel 220 are perpendicular to each other. When the high-pressure gas flows through the gas flow channel 210 and the liquid flow channel 220, a negative pressure is formed at the outlet of the liquid flow channel 220. At this time, the outlet of the liquid flow channel 220 is equivalent to a siphon port, which sucks the oil solution into the liquid flow channel 220 and flows to the siphon port, and then mixes with the high-pressure gas in the gas flow channel 210 to form a gas-liquid mixed fluid. The gas flow channel 210 and the liquid flow channel 220 are perpendicular to each other so that the siphon effect is the strongest, which is conducive to the flow of the oil solution.

[0068] The gas flow channel 210 is coaxial with the gas-liquid accelerating flow channel 230 , which helps the flow of high-pressure gas, reduces energy loss, helps to accelerate the speed of the gas-liquid mixed fluid, and further improves the impact effect of the gas-liquid mixed fluid.

[0069] In some embodiments of the present application, refer to Figures 2 to 5A gas inlet 240 is provided at the end of the second section 290 of the nozzle inner body. The gas inlet 240 is communicated with the gas flow channel 210 , and the gas inlet 240 is externally connected to the gas pipe 300 .

[0070] The gas inlet 240 is a threaded hole, and the gas pipe 300 is connected to the gas inlet 240 by threaded connection.

[0071] A liquid inlet 250 is disposed at the end of the second section 290 of the nozzle inner body. The liquid inlet 250 is communicated with the liquid flow channel 220 , and the liquid inlet 250 is externally connected to a liquid pipe assembly 400 .

[0072] In this embodiment, the liquid pipe assembly 400 includes a silicone tube 420 and a liquid pipe 410 connected to the silicone tube 420. The silicone tube 420 is specifically hard-connected to the pagoda joint of the liquid pipe 410. The liquid inlet 250 is a threaded hole, and the silicone tube 420 is connected to the liquid inlet 250 by threaded connection.

[0073] In some embodiments of the present application, there are multiple drain ports 120, and the multiple drain ports 120 are evenly spaced along the peripheral wall of the impact ring body 100 to facilitate the timely discharge of large-diameter aerosol particles and unbroken oily droplets.

[0074] In some embodiments of the present application, refer to Figure 2 and Figure 5 The first step portion 150 is partially connected to the discharge port 120, and the first step portion 150 plays a role of impact and flow assistance. The large-diameter aerosol particles and unbroken oily droplets flowing down from the gap 800 first fall on the first step portion 150, and then rush to the discharge port 120 and remain, thereby avoiding fluid accumulation at the discharge port 120 and improving the discharge effect.

[0075] Embodiment 2

[0076] The ability of a monodisperse oil aerosol generating nozzle to generate aerosols mainly depends on the impact distance (D3-D1) and the distance of oil film formation (D2-D1). Experimental verification has found that the counting median diameter of monodisperse oil aerosol generation can be changed by changing the impact distance (D3-D1).

[0077] Reference Figure 6 and Figure 7 ,in Figure 6 FIG. 2 is a cross-sectional view of another embodiment of the impact ring 100. Figure 7 It is a cross-sectional view of the adjusting plug 600. In this embodiment, a through hole 160 is provided on the peripheral wall of the impact ring body 100, and an adjusting plug 600 is provided in the through hole 160, and the adjusting plug 600 is directly opposite to the outlet of the gas-liquid acceleration channel 230, and the impact distance D formed between the outlet of the gas-liquid acceleration channel 230 and the adjusting plug 600 is adjustable.

[0078] That is, the impact distance D can be adjusted by adjusting the plug 600, and the adjusting plug 600 plays a role in adjusting the impact wall, thereby achieving the generation of monodisperse oil aerosols with different median particle sizes.

[0079] In this embodiment, refer to Figure 8 One end of the regulating plug 600 is provided with a hand-tightening portion 610, and the hand-tightening portion 610 extends outward from the impact ring body 100. The outer contour shape of the hand-tightening portion 610 is preferably non-circular, such as a rhombus, a hexagon, etc., to facilitate hand-tightening operation.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A monodisperse oily aerosol generating nozzle, characterized in that: include: An impact ring body is formed with a through hole therein, and a drain port is provided on the peripheral wall of the impact ring body; The nozzle inner body is penetrated in the through hole, a gap for fluid circulation and an aerosol outlet are formed between the inner wall of the impact ring body and the outer wall of the nozzle inner body, a gas flow channel, a liquid flow channel and a gas-liquid acceleration flow channel are arranged inside the nozzle inner body, the gas-liquid acceleration flow channel is communicated with the gas flow channel and the liquid flow channel respectively, and a collision distance D is formed between the outlet of the gas-liquid acceleration flow channel and the inner wall of the impact ring body; Wherein, the outlet of the gas-liquid accelerating flow channel is located between the leakage port and the aerosol outlet, and the leakage port, the aerosol outlet and the gap are connected.

2. The monodisperse oil aerosol generating nozzle according to claim 1, characterized in that: The gas-liquid accelerating flow channel and the axis of the impact ring body are perpendicular to each other.

3. The monodisperse oil aerosol generating nozzle according to claim 2, characterized in that: The gas flow channel and the liquid flow channel are perpendicular to each other, and the gas flow channel and the gas-liquid acceleration flow channel are coaxial.

4. The monodisperse oil aerosol generating nozzle according to claim 1, characterized in that: A gas inlet is provided at one end of the inner body of the nozzle, the gas inlet is communicated with the gas flow channel, and the gas inlet is externally connected to a gas pipe; A liquid inlet is provided at the other end of the nozzle inner body, the liquid inlet is communicated with the liquid flow channel, and the liquid inlet is externally connected to a liquid pipe assembly.

5. The monodisperse oil aerosol generating nozzle according to claim 4, characterized in that: The liquid pipe assembly comprises a silicone tube and a liquid pipe connected to the silicone tube, and the silicone tube is threadedly connected to the liquid inlet.

6. The monodisperse oil aerosol generating nozzle according to claim 1, characterized in that: There are a plurality of drain ports, and the plurality of drain ports are evenly spaced and arranged along the peripheral wall of the impact ring body.

7. The monodisperse oil aerosol generating nozzle according to claim 1, characterized in that: The through hole comprises a first through hole section and a second through hole section which are connected, the inner diameter of the first through hole section is larger than the inner diameter of the second through hole section, and a first step portion is formed between the first through hole section and the second through hole section; Correspondingly, the nozzle inner body comprises a nozzle inner body section one and a nozzle inner body section two of an integral structure, the outer diameter of the nozzle inner body section one is larger than the outer diameter of the nozzle inner body section two, and a second step portion is formed between the nozzle inner body section one and the nozzle inner body section two; The first section of the through hole is excessively matched with the first section of the nozzle inner body, the gap is formed between the second section of the through hole and the second section of the nozzle inner body, and the first step portion abuts against the second step portion.

8. The monodisperse oil aerosol generating nozzle according to claim 7, characterized in that: A first threaded hole is provided on the peripheral wall of the impact ring body where the through hole section is located, and a second threaded hole is correspondingly provided on a section of the nozzle inner body, and a screw is passed through the first threaded hole and the second threaded hole.

9. The monodisperse oil aerosol generating nozzle according to claim 7, characterized in that: The first step portion has a portion that intersects and connects with the drain port.

10. The monodisperse oil aerosol generating nozzle according to any one of claims 1 to 9, characterized in that: A through opening is provided on the peripheral wall of the impact ring body, and an adjusting plug is provided in the through opening. The adjusting plug faces the outlet of the gas-liquid acceleration channel, and the impact distance D formed between the outlet of the gas-liquid acceleration channel and the adjusting plug is adjustable.

Images