Nebulizer

Abstract

To provide a nebulizer which can spray in a substantially uniform manner from a jet port with a simple structure.SOLUTION: A nebulizer includes: a nozzle part 20 provided with a jet port 22h for jetting a gas; and a capillary which has a tip part and is disposed so that the tip part protrudes from the jet port 22h. On an inner peripheral surface 220 of the nozzle part of a portion defining the jet port 22h, a plurality of projection parts 221 projecting to the radial inner side of the jet port 22h are arranged in a circumferential direction. The projection parts 221 are provided so as to define an inscribed circle C. The capillary passes through the inside of the inscribed circle C.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to nebulizers. [Background technology]

[0002] As a conventional nebulizer for an ion source, U.S. Patent Application Publication No. 2021 / 0398789 (Patent Document 1) discloses a configuration in which a nebulizer outlet portion that forms the outlet of the nebulizer is attached to the tip of a cylinder through which gas passes.

[0003] The nebulizer outlet section is formed, for example, from multiple parts. Specifically, the nebulizer outlet section includes an inlet-side member that forms the inlet end and an outlet-side member that forms the outlet end. The inlet-side member is attached to the tip of the cylindrical body, and the outlet-side member is attached downstream of the inlet-side member.

[0004] The inlet-side member is provided with a first channel and a second channel that penetrate along the axial direction. The first channel is provided along the central axis of the nebulizer outlet, and the capillary passes through the first channel. The second channel is connected to the interior of the cylindrical body, and serves as a flow path for the gas introduced into the cylindrical body.

[0005] The outlet-side member has a shape that tapers toward the outlet. A space communicating with the second channel extends between the inner surface of the outlet-side member and the tip of the inlet-side member. An outlet opening is provided at the tip of the outlet-side member. The tip side of the capillary passes through the outlet opening, and a gap is provided between the inner circumferential surface of the outlet-side member that defines the outlet opening and the tip of the capillary. The gas is ejected from the gap.

[0006] In another example, the nebulizer outlet is formed from a single member, in which a substantially V-shaped space is provided upstream of the outlet opening in a cross section parallel to the axial direction, and a first channel through which the capillary passes and a second channel communicating with the V-shaped space are provided coaxially with the central axis of the outlet opening. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] US Patent Application Publication No. 2021 / 0398789 Summary of the Invention [Problem to be solved by the invention]

[0008] In Patent Document 1, as described above, when the nebulizer outlet is composed of multiple parts, the multiple parts must be attached coaxially, which requires precision in each part and makes machining difficult. Furthermore, as described above, when the nebulizer outlet is formed as a single part, an additive manufacturing process must be employed to provide the complex-shaped space and the first and second channels. This makes it difficult to create the nebulizer outlet using general-purpose tools such as an end mill or electrical discharge machining.

[0009] Furthermore, in the configuration of Patent Document 1, the approximate position of the capillary is determined by the first channel, which is located upstream of the nebulizer outlet. Therefore, there is a concern that the capillary may be positioned eccentrically from the center of the outlet opening. In this case, the spray shape of the droplets sprayed from the capillary by the gas blown out from the outlet opening will be uneven.

[0010] The present disclosure has been made in consideration of the above-mentioned problems, and an object of the present disclosure is to provide a nebulizer that has a simple configuration and is capable of spraying substantially uniformly from the nozzle. [Means for solving the problem]

[0011] A nebulizer according to a first aspect of the present disclosure includes a nozzle portion provided with an outlet for ejecting gas, and a capillary having a tip end and disposed so that the tip end protrudes from the outlet. A plurality of protrusions protruding radially inward from the outlet are arranged in a circumferential direction on the inner peripheral surface of the nozzle portion at a portion defining the outlet. The plurality of protrusions are arranged so as to define an inscribed circle. The capillary passes inside the inscribed circle.

[0012] According to the above configuration, the simple configuration of multiple protrusions provided on the inner circumferential surface of the nozzle portion can prevent the center of the capillary from being positioned eccentrically from the center of the inscribed circle. Furthermore, since multiple protrusions that determine the position of the capillary are provided at the nozzle, deviation of the tip position of the capillary can be effectively prevented. As a result, deviation in the spray shape of droplets sprayed from the capillary can be prevented, and droplets can be sprayed approximately uniformly from the nozzle.

[0013] A nebulizer according to a second aspect of the present disclosure includes a nozzle portion provided with an outlet for ejecting gas, and a capillary having a tip end and disposed so that the tip end protrudes from the outlet. The inner circumferential surface of the nozzle portion defining the outlet is circular when viewed in the axial direction of the outlet. The capillary has an outer shape with multiple corners. When viewed in the axial direction, the multiple corners are located inside the circle.

[0014] According to the above configuration, with a simple configuration in which the nozzle is formed in a cylindrical shape and the capillary has an outer shape including multiple corners, it is possible to prevent the center of the capillary from being positioned eccentrically from the center of the circular nozzle. Furthermore, because the positions of the multiple corners are determined by the nozzle, it is possible to effectively prevent the tip position of the capillary from shifting. As a result, it is possible to prevent deviation in the spray shape of droplets sprayed from the capillary, and it is possible to spray droplets from the nozzle in a substantially uniform manner. [Effects of the Invention]

[0015] According to the present disclosure, it is possible to provide a nebulizer that has a simple configuration and is capable of spraying substantially uniformly from the outlet. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a schematic cross-sectional view of a nebulizer according to a first embodiment. [Figure 2] 2 is an enlarged perspective view showing the vicinity of the nozzle of the nebulizer according to the first embodiment. FIG. [Figure 3] 3 is a view of the end face on the tip side of the nozzle part according to the first embodiment as viewed from the axial direction. FIG. [Figure 4] 10 is a view of the end face on the tip side of the nozzle part according to Modification 1 as viewed from the axial direction. FIG. [Figure 5] 10 is a view of the end face on the tip side of the nozzle part according to Modification 2, as viewed from the axial direction. FIG. [Figure 6] 11 is a view of the end face on the tip side of the nozzle part according to Modification 3, as viewed from the axial direction. FIG. [Figure 7] 10 is a view of the end face on the tip side of the nozzle part according to Modification 4, viewed from the axial direction. FIG. [Figure 8] FIG. 10 is an enlarged perspective view showing the vicinity of the nozzle of the nozzle portion according to the second embodiment. [Figure 9] FIG. 10 is a view of the tip of a capillary according to the second embodiment as viewed from the axial direction. [Figure 10] FIG. 11 is a view of the tip of a capillary according to Modification 5, viewed from the axial direction. [Figure 11] FIG. 13 is a view of the tip of a capillary according to Modification 6, viewed from the axial direction. [Figure 12] FIG. 13 is a view of the tip of a capillary according to Modification 7, viewed from the axial direction. [Figure 13] FIG. 13 is a view of the tip of a capillary according to Modification 8, viewed from the axial direction. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the embodiments described below, the same or common parts are denoted by the same reference numerals in the drawings, and the description thereof will not be repeated.

[0018] (Embodiment 1) Fig. 1 is a schematic cross-sectional view of a nebulizer according to embodiment 1. Nebulizer 10 according to embodiment 1 will be described with reference to Fig. 1.

[0019] Nebulizer 10 is used, for example, in ion analysis devices such as mass spectrometers and ion mobility spectrometers that perform ionization.

[0020] The nebulizer 10 comprises a main body 20, a capillary 30, and a capillary holder 40. The main body 20 has a generally cylindrical shape and forms a double-tube structure with the capillary 30 disposed therein. That is, the main body 20 is disposed so as to circumferentially surround the capillary 30. A gas flow path 20p through which a gas flows is provided within the main body 20, and a flow path 30p through which a liquid such as a sample solution flows is provided in the capillary 30.

[0021] The main body 20 includes a tubular member 21 and a nozzle portion 22. The tubular member 21 has a cylindrical shape. The tubular member 21 extends along the axial direction. The tubular member 21 has one end 21a and the other end 21b. The one end 21a is located downstream of the other end 21b in the flow direction of the gas. A gas inlet 23 is provided on the other end 21b side of the tubular member 21. The gas inlet 23 extends in a direction intersecting the axial direction of the tubular member 21.

[0022] The nozzle portion 22 is formed so that the tip side has a generally conical cylindrical shape and the base end side has a cylindrical shape. An outlet 22h for ejecting gas is provided at the tip of the nozzle portion 22. The gas introduced from the gas inlet portion 23 passes through the gas flow path 20p and is ejected from the outlet 22h.

[0023] The nozzle portion 22 is fixed to one end 21a of the cylindrical member 21. An engaging portion 22c is provided at the base end of the nozzle portion 22. The engaging portion 22c engages with the one end 21a of the cylindrical member 21, thereby fixing the nozzle portion 22.

[0024] The capillary 30 has a cylindrical shape with an outer diameter and an inner diameter smaller than those of the cylindrical member 21. The capillary 30 has a tip end 31 and a base end 32. The capillary 30 is arranged so that the tip end 31 protrudes from the nozzle 22h. Most of the capillary 30 is located inside the main body 20. The base end 32 of the capillary 30 is held by the capillary holder 40.

[0025] The capillary holding part 40 has a first member 41 and a second member 42. The first member 41 is fixed to the other end 21b of the cylindrical member 21. More specifically, the first member 41 is fixed in a state where a part of the tip side is inserted into the other end 21b side of the cylindrical member 21. The first member 41 has a through hole 41h. The central axis of the through hole 41h substantially coincides with the central axis of the cylindrical member 21.

[0026] A fitting 60, into which a pipe 50 is inserted, is fixed to the base end side of the through hole 41h. A second member 42 is fixed to the tip side of the through hole 41h. The second member 42 has a cylindrical shape. The base end 32 of the capillary 30 is inserted inside the second member 42.

[0027] In this way, the base end 32 of the capillary 30 is inserted into the inside of the second member 42 inserted into the through hole of the first member 41 fixed to the other end 21b side of the tubular member 21, and the base end 32 side of the capillary 30 is held by the capillary holding portion 40.

[0028] The capillary 30 is inserted into the second member 42 so that the flow path 30p communicates with the internal space of the piping 50. By supplying a sample solution to the piping 50, the sample is supplied to the capillary 30.

[0029] The sample supplied to the capillary 30 passes through the flow path 30p and is sprayed in a mist form from the tip of the capillary 30 by gas ejected from the nozzle 22h. The gas promotes vaporization of the droplets sprayed from the tip of the capillary 30 and promotes ionization.

[0030] Fig. 2 is an enlarged perspective view showing the vicinity of the nozzle of the nebulizer according to embodiment 1. Fig. 3 is a view of the end face on the tip side of the nozzle part according to embodiment 1 as seen from the axial direction.

[0031] As shown in Figures 2 and 3, a plurality of protrusions 221 that protrude radially inward of the ejection port 22h are arranged side by side in the circumferential direction on the inner circumferential surface 220 of the nozzle portion 22 that defines the ejection port 22h. The plurality of protrusions 221 are arranged so as to define an inscribed circle C. The top surfaces of the plurality of protrusions 221 are arranged so as to describe an arc when viewed from the axial direction (normal direction) of the ejection port 22h. The top surfaces are surfaces that face the central axis of the ejection port 22h. The plurality of protrusions 221 are arranged side by side in the circumferential direction at predetermined intervals. More specifically, the plurality of protrusions 221 includes four protrusions that are arranged at 90-degree intervals.

[0032] The inner circumferential surface 220 of the nozzle portion 22, which defines the ejection port 22h, has a plurality of bulging portions 222. The bulging portions 222 bulge outward from the inscribed circle C. The bulging portions 222 are arranged in a line at predetermined intervals in the circumferential direction. The bulging portions 222 include four bulging portions, which are arranged at 90-degree intervals. By arranging the bulging portions 222 at a predetermined interval, gas can be ejected approximately uniformly from the ejection port 22h around the capillary 30. When viewed from the axial direction, each bulging portion 222 has a shape obtained by dividing an elongated hole into two along the minor axis direction. A protrusion 221 is arranged between each pair of bulging portions 222 adjacent to each other in the circumferential direction. The opening width of the bulging portion 222, which opens into the inscribed circle C, is smaller than the outer diameter of the capillary 30. That is, the interval between the protrusions 221 adjacent to each other in the circumferential direction is smaller than the outer diameter of the capillary 30. This makes it possible to prevent the capillary 30 from entering the bulging portion 222.

[0033] As described above, the capillary 30 passes through the inscribed circle C defined by the plurality of protrusions 221. The diameter of the inscribed circle C is approximately equal to the outer diameter of the capillary 30.

[0034] The capillary 30 is positioned within the inscribed circle C by the multiple protrusions 221 so that the center of the inscribed circle C and the center of the capillary 30 approximately coincide with each other. This makes it possible to prevent the center of the capillary 30 from being positioned eccentrically from the center of the inscribed circle C by using a simple configuration of the multiple protrusions 221 provided on the inner circumferential surface 220 of the nozzle portion 22.

[0035] Furthermore, since the plurality of protrusions 221 that determine the position of the capillary 30 are provided at the nozzle 22h, deviation of the tip position of the capillary 30 can be effectively suppressed. That is, since the plurality of protrusions 221 that determine the position of the capillary 30 are provided at the nozzle 22h, which is the outlet end of the gas flow path 20p, the central axis of the capillary 30 at the outlet end can be made approximately coaxial with the central axis of the nozzle 22h with high precision, compared to a configuration in which the capillary 30 is aligned midway through the gas flow path 20p. As a result, deviation in the spray shape of droplets sprayed from the capillary 30 can be suppressed, and droplets can be sprayed approximately uniformly from the nozzle 22h.

[0036] Furthermore, the shape of the nozzle 22h provided on the end face of the nozzle portion 22 located at the tip is a constant shape along the axial direction of the nozzle portion 22. This simplifies the configuration of the nozzle portion 22 and allows the nozzle 22h to be manufactured using general-purpose tools such as an end mill or electric discharge machining. This eliminates the need for special manufacturing methods such as additive manufacturing, allowing the nozzle portion 22, and therefore the nebulizer, to be manufactured inexpensively and easily.

[0037] In addition, the member (positioning member) that positions the tip 31 of the capillary 30 is composed of a single nozzle portion 22. This allows for improved processing accuracy compared to when the positioning member is divided into multiple parts, thereby increasing the accuracy of positioning the capillary 30.

[0038] (Variation 1) 4 is a view of the end face on the tip side of the nozzle part according to Modification 1, viewed from the axial direction. The nebulizer according to Modification 1 will be described with reference to FIG.

[0039] The nebulizer according to Modification 1 differs from Embodiment 1 in the shape of the tip of nozzle portion 22A and the shape of ejection port 22h, but the other configurations are substantially the same.

[0040] In the first modification, a plurality of protrusions 221 are arranged side by side in the circumferential direction on the inner peripheral surface 220 of the nozzle part 22 that defines the ejection port 22h, and are provided so as to define an inscribed circle C, through which the capillary 30 passes. Four protrusions 221 are provided, and are arranged at 90-degree intervals.

[0041] Furthermore, four bulging portions 222 are arranged in the circumferential direction at 90-degree intervals, and each of the four bulging portions 222 has a track shape with its minor axis approximately parallel to the radial direction when viewed from the axial direction. A protrusion 221 is arranged between each of the bulging portions 222 adjacent to each other in the circumferential direction.

[0042] Even when configured as described above, the nebulizer according to the first modification can achieve substantially the same effects as the nebulizer according to the first embodiment.

[0043] (Variation 2) 5 is a view of the end face on the tip side of the nozzle part according to Modification 2, viewed from the axial direction. The nebulizer according to Modification 2 will be described with reference to FIG.

[0044] The nebulizer according to Modification 2 differs from Embodiment 1 in the shape of the tip of nozzle portion 22B and the shape of ejection port 22h, but the other configurations are substantially the same.

[0045] In the second modification, a plurality of protrusions 221 are arranged side by side in the circumferential direction on the inner peripheral surface 220 of the nozzle part 22 that defines the ejection port 22h, and are provided so as to define an inscribed circle C, through which the capillary 30 passes. Three protrusions 221 are provided, and are arranged at 120 degree intervals.

[0046] Furthermore, three bulging portions 222 are arranged in the circumferential direction at 120-degree intervals, and each of the three bulging portions 222 has an elongated hole shape that extends in a substantially arc shape when viewed in the axial direction. A protrusion 221 is arranged between each of the bulging portions 222 that are adjacent to each other in the circumferential direction.

[0047] Even when configured as described above, the nebulizer according to the second modification can achieve substantially the same effects as the nebulizer according to the first embodiment.

[0048] (Variation 3) 6 is a view of the end face on the tip side of the nozzle part according to Modification 3, viewed from the axial direction. The nebulizer according to Modification 3 will be described with reference to FIG.

[0049] The nebulizer according to Modification 3 differs from Embodiment 1 in the shape of the tip of nozzle portion 22C and the shape of ejection port 22h, but the other configurations are substantially the same.

[0050] In the third modification, a plurality of protrusions 221 are arranged side by side in the circumferential direction on the inner peripheral surface 220 of the nozzle part 22 that defines the ejection port 22h, and are provided so as to define an inscribed circle C, through which the capillary 30 passes. Six protrusions 221 are provided, and are arranged at 60-degree intervals.

[0051] The six bulging portions 222 are arranged at 60-degree intervals in the circumferential direction, and each of the six bulging portions 222 has a substantially semicircular shape when viewed from the axial direction. A protrusion 221 is arranged between each of the bulging portions 222 adjacent to each other in the circumferential direction.

[0052] Even when configured as described above, the nebulizer according to Modification 3 can achieve substantially the same effects as the nebulizer according to Embodiment 1.

[0053] (Variation 4) 7 is a view of the end face on the tip side of the nozzle part according to Modification 4, viewed from the axial direction. The nebulizer according to Modification 4 will be described with reference to FIG.

[0054] The nebulizer according to Modification 4 differs from that of Embodiment 1 in the shape of the tip of nozzle portion 22D and the shape of ejection port 22h, but the other configurations are substantially the same.

[0055] In the fourth modification, a plurality of protrusions 221 are arranged side by side in the circumferential direction on the inner peripheral surface 220 of the nozzle part 22 that defines the ejection port 22h, and are provided so as to define an inscribed circle C, through which the capillary 30 passes. Six protrusions 221 are provided, and are arranged at 60-degree intervals.

[0056] The six bulging portions 222 are arranged at 60-degree intervals in the circumferential direction, and each of the six bulging portions 222 has a substantially circular shape when viewed in the axial direction. A protrusion 221 is arranged between each of the bulging portions 222 adjacent to each other in the circumferential direction.

[0057] Even when configured as described above, the nebulizer according to the fourth modification can achieve substantially the same effects as the nebulizer according to the first embodiment.

[0058] (Embodiment 2) Fig. 8 is an enlarged perspective view showing the vicinity of the nozzle of the nozzle part according to embodiment 2. Fig. 9 is a view of the tip end of the capillary according to embodiment 2 as seen from the axial direction. The nebulizer according to embodiment 2 will be described with reference to Figs. 8 and 9.

[0059] 8 and 9, the nebulizer according to the second embodiment differs from that of the first embodiment in the shape of the capillary 30E, the shape of the tip of the nozzle portion 22E, and the shape of the ejection port 22h. The other configurations are almost the same.

[0060] In the second embodiment, the ejection port 22h has a circular shape when viewed from the axial direction of the ejection port 22h. In other words, when viewed from the axial direction, the inner circumferential surface of the nozzle portion 22 that defines the ejection port 22h has a circular shape.

[0061] Furthermore, the capillary 30E has an outer shape with multiple corners 33, and when viewed from the axial direction, the shape of the inner surface 30i of the capillary that defines the flow path 30p and the outer shape of the capillary 30E are similar in shape.

[0062] Specifically, the capillary 30E has a polygonal cylindrical shape. More specifically, the capillary 30E has a dodecagonal cylindrical shape with each side curved to bulge outward. Although the multiple corners 33 are illustrated as being rounded, they do not have to be rounded. The multiple corners 33 are arranged at a predetermined pitch in the circumferential direction. This allows gas to be ejected from the ejection port 22h approximately uniformly around the capillary 30. When viewed from the axial direction, the multiple corners 33 are arranged within the circle formed by the inner circumferential surface of the nozzle portion 22.

[0063] The capillary 30E is positioned within the circle so that the center of the circle and the center of the capillary 30E substantially coincide with each other by the multiple corners 33. This makes it possible to prevent the center of the capillary 30E from being positioned eccentrically from the center of the circular nozzle 22h, even with a simple configuration in which the nozzle 22h is formed in a cylindrical shape and the capillary 30 has an outer shape including multiple corners.

[0064] Furthermore, since the positions of the multiple corners 33 are determined by the nozzle 22h, it is possible to effectively prevent the tip of the capillary from being displaced. As a result, it is possible to prevent deviation in the spray shape of the droplets sprayed from the capillary, and it is possible to spray the droplets from the nozzle approximately uniformly.

[0065] As described above, the nebulizer according to the second embodiment provides substantially the same effects as the nebulizer according to the first embodiment.

[0066] (Variation 5) 10 is a view of the tip of a capillary according to Modification 5 as seen from the axial direction. The nebulizer according to Modification 5 will be described with reference to FIG.

[0067] The nebulizer according to Modification 5 differs from that of Embodiment 2 in the shape of the capillary 30F, but the other configurations are almost the same.

[0068] In the fifth modification, the capillary 30F also has an outer shape having a plurality of corners 33, specifically, a hexagonal cylindrical shape. The plurality of corners 33 are arranged within the circle formed by the inner circumferential surface of the nozzle portion 22.

[0069] Even when configured as described above, the nebulizer according to Modification 5 can achieve substantially the same effects as the nebulizer according to Embodiment 2.

[0070] (Variation 6) 11 is a view of the tip of a capillary according to Modification 6 as seen from the axial direction. The nebulizer according to Modification 6 will be described with reference to FIG.

[0071] The nebulizer according to Modification 6 differs from that of Embodiment 2 in the shape of the capillary 30G, but the other configurations are almost the same.

[0072] In the sixth modification, the capillary 30G also has an outer shape having a plurality of corners 33, specifically, a square cylindrical shape. The plurality of corners 33 are arranged within the circle formed by the inner peripheral surface of the nozzle portion 22.

[0073] Even when configured as described above, the nebulizer according to Modification 6 can achieve substantially the same effects as the nebulizer according to Embodiment 2.

[0074] (Variation 7) 12 is a view of the tip of a capillary according to Modification 7 as seen from the axial direction. The nebulizer according to Modification 7 will be described with reference to FIG.

[0075] The nebulizer according to Modification 7 differs from that of Embodiment 2 in the shape of the capillary 30H, but the other configurations are almost the same.

[0076] In the seventh modification, the capillary 30H also has an outer shape with a plurality of corners 33, specifically, an octagonal cylindrical shape with each side curved so as to bulge outward. The plurality of corners 33 are arranged within the circle formed by the inner peripheral surface of the nozzle portion 22.

[0077] Even when configured as described above, the nebulizer according to the seventh modification can achieve substantially the same effects as the nebulizer according to the second embodiment.

[0078] (Variation 8) 13 is a view of the tip of a capillary according to Modification 8 as seen from the axial direction. The nebulizer according to Modification 8 will be described with reference to FIG.

[0079] The nebulizer according to Modification 8 differs from that of Embodiment 2 in the shape of the capillary 30. The other configurations are almost the same.

[0080] In the eighth modification, the capillary 30I also has an outer shape with a plurality of corners 33, specifically, a triangular cylindrical shape. The plurality of corners 33 are arranged within the circle formed by the inner peripheral surface of the nozzle portion 22.

[0081] Even when configured as described above, the nebulizer according to Modification 8 can achieve substantially the same effects as the nebulizer according to Embodiment 2.

[0082] (Addendum) [Configuration 1] a nozzle portion provided with an outlet for ejecting gas; a capillary having a tip end portion and arranged so that the tip end portion protrudes from the ejection port; a plurality of protrusions protruding radially inward from the ejection port are arranged side by side in the circumferential direction on an inner circumferential surface of the nozzle portion at a portion that defines the ejection port; the plurality of protrusions are provided so as to define an inscribed circle, A nebulizer in which the capillary passes inside the inscribed circle.

[0083] [Configuration 2] 2. The nebulizer of claim 1, wherein the number of protrusions is three or more.

[0084] [Configuration 3] 3. The nebulizer according to claim 1, wherein the plurality of protrusions are arranged in a circumferential direction at predetermined intervals.

[0085] [Configuration 4] 4. The nebulizer according to any one of configurations 1 to 3, wherein the distance between the circumferentially adjacent protrusions is smaller than the outer diameter of the capillary.

[0086] [Configuration 5] the inner circumferential surface of the nozzle portion defining the ejection port has a plurality of bulging portions bulging outward from the inscribed circle, The plurality of bulging portions are arranged side by side in the circumferential direction, 5. The nebulizer according to any one of configurations 1 to 4, wherein the protrusion is located between circumferentially adjacent bulging portions.

[0087] [Configuration 6] a nozzle portion provided with an outlet for ejecting gas; a capillary having a tip end portion and arranged so that the tip end portion protrudes from the ejection port; an inner circumferential surface of the nozzle portion that defines the ejection port is circular when viewed from the axial direction of the ejection port, the capillary has an outer shape with a plurality of corners, A nebulizer in which the multiple corners are located inside the circle when viewed in the axial direction.

[0088] [Configuration 7] the capillary includes a flow path through which a liquid sample flows; 7. The nebulizer according to claim 6, wherein the shape of the inner circumferential surface of the capillary defining the flow path is similar to the outer shape of the capillary when viewed in the axial direction.

[0089] The embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is defined by the claims, and includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0090] 10 nebulizer, 20 main body portion, 20p gas flow path, 21 tubular member, 21a one end, 21b other end, 22, 22A, 22B, 22C, 22D, 22E nozzle portion, 22c engagement portion, 22h nozzle outlet, 23 gas inlet portion, 30, 30E, 30F, 30G, 30H, 30I capillary, 30i inner surface, 30p flow path, 31 tip portion, 32 base end portion, 33 corner portion, 40 capillary holding portion, 41 first member, 41h through hole, 42 second member, 50 piping, 60 joint, 220 inner surface, 221 protrusion portion, 222 bulge portion, C inscribed circle.

Claims

1. a nozzle portion provided with an outlet for ejecting gas; a capillary having a tip end portion and arranged so that the tip end portion protrudes from the ejection port; a plurality of protrusions protruding radially inward from the ejection port are arranged side by side in the circumferential direction on an inner circumferential surface of the nozzle portion at a portion that defines the ejection port; the plurality of protrusions are provided so as to define an inscribed circle, A nebulizer in which the capillary passes inside the inscribed circle.

2. The nebulizer of claim 1 , wherein the number of protrusions is three or more.

3. The nebulizer according to claim 1 , wherein the plurality of protrusions are arranged in a line at predetermined intervals in the circumferential direction.

4. The nebulizer according to claim 1 , wherein the distance between the circumferentially adjacent protrusions is smaller than the outer diameter of the capillary.

5. the inner circumferential surface of the nozzle portion defining the ejection port has a plurality of bulging portions bulging outward from the inscribed circle, The plurality of bulging portions are arranged side by side in the circumferential direction, The nebulizer according to claim 1 , wherein the protrusion is located between bulging portions adjacent to each other in the circumferential direction.

6. a nozzle portion provided with an outlet for ejecting gas; a capillary having a tip end portion and arranged so that the tip end portion protrudes from the ejection port; an inner circumferential surface of the nozzle portion that defines the ejection port is circular when viewed from the axial direction of the ejection port, the capillary has an outer shape with a plurality of corners, A nebulizer in which the multiple corners are located inside the circle when viewed in the axial direction.

7. the capillary includes a flow path through which a liquid sample flows; 7. The nebulizer according to claim 6, wherein, when viewed in the axial direction, the shape of the inner circumferential surface of the capillary defining the flow path is similar to the outer shape of the capillary.

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