Atomizer

Abstract

A nebulizer is provided with: a nozzle part (20) provided with a discharge port (22h) for discharging gas; and a capillary tube having a tip portion disposed so as to protrude from the ejection port (22h), a plurality of protrusions (221) protruding toward the inside in the radial direction of the ejection port (22h) being disposed in a row in the circumferential direction on an inner circumferential surface (220) of the nozzle portion defining a portion of the ejection port (22h), the plurality of protrusions (221) being provided so as to define an inscribed circle (C), and the capillary tube passing through the inside of the inscribed circle (C).

Description

Technical Field

[0001] The present disclosure relates to an atomizer. Background Art

[0002] As a conventional nebulizer for an ion source, U.S. Patent Application Publication No. 2021 / 0398789 discloses a structure in which a nebulizer outlet portion constituting the outlet of the nebulizer is mounted on the top end of a cylindrical body through which gas passes.

[0003] For example, the atomizer outlet is formed by a plurality of parts. Specifically, the atomizer outlet includes an inlet-side component constituting an inlet end and an outlet-side component constituting an outlet end. The inlet-side component is mounted on the top end of the barrel, and the outlet-side component is mounted downstream of the inlet-side component.

[0004] The inlet side component is provided with a first channel and a second channel extending axially therethrough. The first channel is provided along the central axis of the atomizer outlet portion and is provided for the capillary to pass through. The second channel is connected to the interior of the cylindrical body and forms a flow path for the gas introduced into the cylindrical body.

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

[0006] As another example, the atomizer outlet is formed from a single component. In this case, 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 is provided coaxially with the central axis of the outlet opening and through which the capillary tube passes, and a second channel is provided that communicates with the V-shaped space. Summary of the Invention

[0007] As described above in U.S. Patent Application Publication No. 2021 / 0398789, when the atomizer outlet is composed of multiple parts, the multiple parts need to be coaxially mounted, which requires high precision for each part and makes machining difficult. Furthermore, as described above, when the atomizer outlet is formed from a single component, a laminated molding process is required to provide the complex-shaped space portion and the first and second channels. Therefore, it is difficult to manufacture using common tools and methods such as end mills and electrical discharge machining.

[0008] Furthermore, in the configuration described in the aforementioned U.S. Patent Application Publication No. 2021 / 0398789, the approximate position of the capillary tube is determined by the first channel, which is located further upstream than the atomizer outlet. Consequently, there is a concern that the capillary tube may be positioned off-center from the center of the outlet opening. In this case, the gas blown from the outlet opening could cause a deviation in the spray pattern of the droplets sprayed from the capillary tube.

[0009] The present disclosure has been made in view of the above-mentioned problems, and an object of the present disclosure is to provide an atomizer capable of performing substantially uniform spraying from a spray port with a simple configuration.

[0010] The atomizer according to the first embodiment of the present disclosure comprises: a nozzle portion having a gas outlet for ejecting gas; and a capillary tube having a tip portion, the tip portion being arranged so as to protrude from the gas outlet. A plurality of protrusions are arranged circumferentially on the inner circumferential surface of the nozzle portion, which defines a portion of the gas outlet, and protrude radially inward from the gas outlet. The plurality of protrusions are arranged so as to define an inscribed circle. The capillary tube passes inside the inscribed circle.

[0011] With this configuration, the simple arrangement of multiple protrusions on the inner circumferential surface of the nozzle prevents the center of the capillary from being positioned eccentrically from the center of the inscribed circle. Furthermore, since the multiple protrusions that determine the position of the capillary are located on the nozzle outlet, any deviation in the position of the capillary tip can be effectively suppressed. As a result, variations in the spray pattern of droplets sprayed from the capillary can be suppressed, ensuring a substantially uniform spray of droplets from the nozzle outlet.

[0012] The atomizer according to the second embodiment of the present disclosure comprises: a nozzle portion having a gas outlet for ejecting gas; and a capillary tube having a tip portion, the tip portion being configured to protrude from the gas outlet. The inner circumferential surface of the nozzle portion, which defines a portion of the gas outlet, is configured to be circular when viewed from the axial direction of the gas outlet. The capillary tube has an outer shape including a plurality of corners. When viewed from the axial direction, the plurality of corners are located on the inner side of the circular shape.

[0013] According to the above configuration, by forming the ejection port into a cylindrical shape and the capillary having a simple configuration with multiple corners, it is possible to prevent the center of the capillary from being positioned off-center from the center of the circular ejection port. Furthermore, since the positions of the multiple corners are determined by the ejection port, it is possible to effectively prevent the position of the tip of the capillary from shifting. As a result, it is possible to suppress variations in the spray pattern of droplets sprayed from the capillary, achieving a substantially uniform spray of droplets from the ejection port.

[0014] The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic cross-sectional view of the atomizer according to the first embodiment.

[0016] Figure 2 This is an enlarged perspective view showing the vicinity of the discharge port of the atomizer according to the first embodiment.

[0017] Figure 3 This is a diagram of the end surface of the nozzle portion on the tip side according to the first embodiment as viewed from the axial direction.

[0018] Figure 4 This is a diagram of the end surface on the tip side of the nozzle portion of Modification 1 as viewed from the axial direction.

[0019] Figure 5 This is a diagram of the end surface on the tip side of the nozzle portion of Modification 2 as viewed from the axial direction.

[0020] Figure 6 This is a diagram of the end surface on the tip side of the nozzle portion of Modification 3 as viewed from the axial direction.

[0021] Figure 7 This is a diagram of the end surface on the tip side of the nozzle portion of Modification 4 as viewed from the axial direction.

[0022] Figure 8 This is an enlarged perspective view showing the vicinity of the ejection outlet of the nozzle portion according to the second embodiment.

[0023] Figure 9 This is a diagram showing the tip of the capillary tube according to the second embodiment as viewed from the axial direction.

[0024] Figure 10 This is a diagram showing the tip of the capillary according to Modification 5 as viewed from the axial direction.

[0025] Figure 11 This is a diagram showing the tip of the capillary according to Modification 6 as viewed from the axial direction.

[0026] Figure 12 This is a diagram showing the tip of the capillary according to Modification 7 as viewed from the axial direction.

[0027] Figure 13 This is a diagram showing the tip of the capillary tube of Modification 8 as viewed from the axial direction. DETAILED DESCRIPTION

[0028] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the embodiments described below, identical or common parts are denoted by identical reference numerals in the drawings, and their description will not be repeated.

[0029] (Implementation Method 1)

[0030] Figure 1 This is a schematic cross-sectional view of the atomizer according to the first embodiment. Figure 1 , the atomizer 10 of embodiment 1 is described.

[0031] The atomizer 10 is used in, for example, a plasma analyzer such as a mass spectrometer and an ion mobility analyzer that perform ionization.

[0032] The nebulizer 10 includes 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. Specifically, the main body 20 is disposed so as to circumferentially surround the capillary 30. A gas flow path 20p for gas flow is provided within the main body 20, and a flow path 30p for liquid such as a sample solution is provided within the capillary 30.

[0033] 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 axially. The tubular member 21 has one end 21a and the other end 21b. The one end 21a is located further downstream than the other end 21b in the flow direction of the gas. A gas inlet portion 23 is provided on the other end 21b side of the tubular member 21. The gas inlet portion 23 extends in a direction intersecting the axial direction of the tubular member 21.

[0034] The nozzle portion 22 is formed to have a substantially conical cylindrical shape at its tip and a cylindrical shape at its base. A gas outlet 22h is provided at the tip of the nozzle portion 22. Gas introduced from the gas inlet 23 passes through the gas flow path 20p and is ejected from the gas outlet 22h.

[0035] The nozzle portion 22 is fixed to the one end 21a side of the cylindrical member 21. An engaging portion 22c is provided at the base end portion of the nozzle portion 22. The engaging portion 22c engages with the one end 21a side of the cylindrical member 21 to fix the nozzle portion 22.

[0036] The capillary 30 has a cylindrical shape with an outer and inner diameter smaller than those of the tubular member 21. The capillary 30 has a tip portion 31 and a base portion 32. The capillary 30 is arranged so that the tip portion 31 protrudes from the discharge port 22h. The majority of the capillary 30 is located within the main body 20. The base portion 32 of the capillary 30 is held by the capillary holder 40.

[0037] The capillary holding portion 40 includes a first component 41 and a second component 42. The first component 41 is fixed to the other end 21b of the tubular component 21. More specifically, the first component 41 is fixed with a portion of its distal end inserted into the other end 21b of the tubular component 21. The first component 41 has a through-hole 41h. The central axis of the through-hole 41h is substantially aligned with the central axis of the tubular component 21.

[0038] A joint 60 into which the tube 50 is inserted is fixed to the proximal end of the through hole 41h. A second member 42 is fixed to the distal end of the through hole 41h. The second member 42 has a cylindrical shape. The proximal end 32 of the capillary 30 is inserted into the second member 42.

[0039] Thus, the base end portion 32 of the capillary 30 is inserted into the second member 42 inserted into the through hole of the first member 41 fixed to the other end 21 b side of the tubular member 21 , whereby the base end portion 32 side of the capillary 30 is held by the capillary holding portion 40 .

[0040] The capillary 30 is inserted into the second member 42 so that the flow path 30p communicates with the inner space of the tube 50. The sample solution is supplied to the tube 50, thereby supplying the sample to the capillary 30.

[0041] The sample supplied to the capillary 30 passes through the flow path 30p and is sprayed out from the tip of the capillary 30 by the gas ejected from the ejection port 22h. This gas promotes vaporization of droplets sprayed from the tip of the capillary 30, thereby promoting ionization.

[0042] Figure 2 This is an enlarged perspective view showing the vicinity of the discharge port of the atomizer according to the first embodiment. Figure 3 This is a diagram of the end surface of the nozzle portion on the tip side according to the first embodiment as viewed from the axial direction.

[0043] like Figure 2 and Figure 3 As shown, on the inner circumferential surface 220 of the nozzle portion 22 that defines the ejection outlet 22h, a plurality of protrusions 221 that protrude radially inwardly toward the ejection outlet 22h are arranged circumferentially. The plurality of protrusions 221 are arranged in a manner that defines an inscribed circle C. When observed from the axial direction (normal direction) of the ejection outlet 22h, the top surfaces of the plurality of protrusions 221 are arranged in a manner that describes an arc shape. The above-mentioned top surface is a surface opposite to the center axis of the ejection outlet 22h. The plurality of protrusions 221 are arranged circumferentially at predetermined intervals. More specifically, the plurality of protrusions 221 include four protrusions, and the four protrusions are arranged at 90-degree intervals.

[0044] Furthermore, the inner circumferential surface 220 of the nozzle portion 22, which defines the ejection outlet 22h, has multiple bulges 222. These bulges 222 bulge outward from the inscribed circle C. These bulges 222 are arranged circumferentially at predetermined intervals. The bulges 222 include four bulges spaced 90 degrees apart. By arranging the bulges 222 at predetermined intervals, gas can be ejected from the ejection outlet 22h in a substantially uniform manner around the capillary 30. Each bulge 222, when viewed axially, has a shape that bisects the elongated hole along its minor axis. A protrusion 221 is disposed between each circumferentially adjacent bulge 222. Furthermore, the width of the opening of each bulge 222 toward the inscribed circle C is smaller than the outer diameter of the capillary 30. In other words, the spacing between circumferentially adjacent protrusions 221 is smaller than the outer diameter of the capillary 30. This prevents the capillary 30 from entering the bulged portion 222 .

[0045] 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 substantially equal to the outer diameter of the capillary 30 .

[0046] The capillary 30 is positioned within the inscribed circle C by the plurality of protrusions 221 so that the center of the inscribed circle C is substantially aligned with the center of the capillary 30. Thus, with the simple configuration of the plurality of protrusions 221 provided on the inner circumferential surface 220 of the nozzle portion 22, it is possible to prevent the center of the capillary 30 from being positioned eccentrically from the center of the inscribed circle C.

[0047] Furthermore, the multiple protrusions 221 that determine the position of the capillary 30 are provided at the discharge port 22h, effectively preventing the tip of the capillary 30 from shifting. Specifically, the multiple protrusions 221 that determine the position of the capillary 30 are provided at the discharge port 22h, which serves as the outlet end of the gas flow path 20p. This allows the central axis of the capillary 30 to be aligned with the central axis of the discharge port 22h at the outlet end with high precision, compared to configurations in which the capillary 30 is aligned midway along the gas flow path 20p. As a result, variations in the spray pattern of droplets sprayed from the capillary 30 are prevented, enabling a substantially uniform spray of droplets from the discharge port 22h.

[0048] Furthermore, the shape of the discharge port 22h provided on the end face of the nozzle portion 22 at the top is constant along the axial direction of the nozzle portion 22. This simplifies the structure of the nozzle portion 22 and enables the discharge port 22h to be manufactured using common tools and methods such as end mills and electrical discharge machining. This eliminates the need for specialized manufacturing methods such as lamination molding, allowing the nozzle portion 22, and thus the atomizer, to be manufactured inexpensively and simply.

[0049] Furthermore, the member (positioning member) for positioning the tip 31 of the capillary 30 is formed of a single nozzle portion 22. This improves processing accuracy compared to a case where the positioning member is divided into multiple parts, thereby improving positioning accuracy of the capillary 30.

[0050] (Variation 1)

[0051] Figure 4 This is a diagram showing the end face of the nozzle portion of Modification 1 viewed from the axial direction. Figure 4 , the atomizer of variant example 1 is described.

[0052] The atomizer of Modification 1 differs from Embodiment 1 in the shape of the tip of the nozzle portion 22A and the shape of the discharge port 22h. The other structures are substantially the same.

[0053] In Modification 1, a plurality of protrusions 221 arranged circumferentially on the inner circumferential surface 220 of the nozzle portion 22 defining the ejection port 22h are also provided to define an inscribed circle C through which the capillary 30 passes. Four protrusions 221 are provided at 90-degree intervals.

[0054] Furthermore, the four bulges 222 are arranged circumferentially at 90-degree intervals. When viewed from the axial direction, the four bulges 222 each have a racetrack shape with a minor axis substantially parallel to the radial direction. A protrusion 221 is disposed between adjacent bulges 222 in the circumferential direction.

[0055] Even when configured as described above, the atomizer of Modification 1 can obtain substantially the same effects as those of the atomizer of Embodiment 1.

[0056] (Variation 2)

[0057] Figure 5 This is a diagram showing the end face of the nozzle portion of Modification 2 viewed from the axial direction. Figure 5 , the atomizer of variant example 2 is described.

[0058] The atomizer of Modification 2 is different from Embodiment 1 in the shape of the tip of the nozzle portion 22B and the shape of the discharge port 22h. The other structures are substantially the same.

[0059] In the second modification, a plurality of protrusions 221 are arranged circumferentially on the inner circumferential surface 220 of the nozzle portion 22 defining the ejection port 22h 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.

[0060] The three bulges 222 are arranged circumferentially at intervals of 120 degrees. When viewed from the axial direction, the three bulges 222 each have a substantially arc-shaped elongated hole shape. A protrusion 221 is arranged between adjacent bulges 222 in the circumferential direction.

[0061] Even when configured as described above, the atomizer of Modification 2 can obtain substantially the same effects as those of the atomizer of Embodiment 1.

[0062] (Variation 3)

[0063] Figure 6 This is a diagram showing the end face of the nozzle portion of Modification 3 viewed from the axial direction. Figure 6 , the atomizer of variant example 3 is described.

[0064] The atomizer of Modification 3 differs from Embodiment 1 in the shape of the tip of the nozzle portion 22C and the shape of the discharge port 22h. The other structures are substantially the same.

[0065] In Modification 3, a plurality of protrusions 221 are arranged circumferentially on the inner circumferential surface 220 of the nozzle portion 22 defining the ejection port 22h so as to define an inscribed circle C through which the capillary 30 passes. Six protrusions 221 are provided at 60-degree intervals.

[0066] The six bulges 222 are arranged at 60-degree intervals in the circumferential direction, and each of the six bulges 222 has a substantially semicircular shape when viewed from the axial direction. A protrusion 221 is arranged between adjacent bulges 222 in the circumferential direction.

[0067] Even when configured as described above, the atomizer of Modification 3 can obtain substantially the same effects as those of the atomizer of Embodiment 1.

[0068] (Variation 4)

[0069] Figure 7 This is a diagram showing the end face of the nozzle portion of Modification 4 viewed from the axial direction. Figure 7 , the atomizer of variant example 4 is described.

[0070] The atomizer of Modification 4 differs from Embodiment 1 in the shape of the tip of the nozzle portion 22D and the shape of the discharge port 22h. The other structures are substantially the same.

[0071] In Modification 4, a plurality of protrusions 221 are arranged circumferentially on the inner circumferential surface 220 of the nozzle portion 22 defining the ejection port 22h so as to define an inscribed circle C through which the capillary 30 passes. Six protrusions 221 are provided at 60-degree intervals.

[0072] The six bulges 222 are arranged at 60-degree intervals in the circumferential direction, and each of the six bulges 222 has a substantially circular shape when viewed from the axial direction. A protrusion 221 is arranged between adjacent bulges 222 in the circumferential direction.

[0073] Even when configured as described above, the atomizer of Modification 4 can obtain substantially the same effects as those of the atomizer of Embodiment 1.

[0074] (Implementation Method 2)

[0075] Figure 8 This is an enlarged perspective view showing the vicinity of the ejection outlet of the nozzle portion according to the second embodiment. Figure 9 This is a diagram showing the tip of the capillary tube according to Embodiment 2 as viewed from the axial direction. Figure 8 and Figure 9 , the atomizer of embodiment 2 is described.

[0076] like Figure 8 and Figure 9 As shown, the atomizer of Embodiment 2 differs from Embodiment 1 in the shape of the capillary tube 30E, the shape of the tip of the nozzle portion 22E, and the shape of the discharge port 22h. The other structures are substantially the same.

[0077] In Embodiment 2, the discharge port 22h is provided in a circular shape when viewed from the axial direction of the discharge port 22h. In other words, the inner peripheral surface of the nozzle portion 22 defining a portion of the discharge port 22h is provided in a circular shape when viewed from the axial direction.

[0078] When the capillary 30E having an outer shape including a plurality of corners 33 is viewed from the axial direction, the shape of the inner peripheral surface 30i of the capillary defining the flow path 30p is similar to the outer shape of the capillary 30E.

[0079] Specifically, the capillary tube 30E has a polygonal cylindrical shape. More specifically, the capillary tube 30E has a twelve-sided cylindrical shape, curved so that each side bulges outward. While the illustrated example shows multiple corners 33 with rounded corners, they do not need to be rounded. The multiple corners 33 are arranged circumferentially at predetermined intervals. This allows gas to be ejected from the ejection port 22h in a roughly uniform manner around the capillary tube 30. When viewed from the axial direction, the multiple corners 33 are arranged within the circular shape formed by the inner circumferential surface of the nozzle portion 22.

[0080] The capillary 30E is positioned within the circle by the multiple corners 33 so that the center of the circle is substantially aligned with the center of the capillary 30E. Thus, by forming the discharge port 22h into a cylindrical shape and forming the capillary 30 into an outer shape including multiple corners, it is possible to prevent the center of the capillary 30E from being positioned off-center from the center of the circular discharge port 22h.

[0081] Furthermore, the positions of the corners 33 are determined by the discharge port 22h, effectively preventing the tip of the capillary from shifting. Consequently, variations in the spray shape of droplets sprayed from the capillary are prevented, and droplets can be sprayed substantially uniformly from the discharge port.

[0082] As described above, the atomizer of the second embodiment can obtain substantially the same effects as those of the atomizer of the first embodiment.

[0083] (Variant 5)

[0084] Figure 10 This is a diagram showing the tip of the capillary tube of Modification 5 as viewed from the axial direction. Figure 10 , the atomizer of variant example 5 is described.

[0085] The nebulizer of Modification 5 has a different shape of a capillary tube 30F from that of Embodiment 2. The other structures are substantially the same.

[0086] In Modification 5, the capillary 30F also has an outer shape including a plurality of corner portions 33 , specifically, a hexagonal cylindrical shape. The plurality of corner portions 33 are arranged within the aforementioned circular shape formed by the inner peripheral surface of the nozzle portion 22 .

[0087] Even when configured as described above, the atomizer of Modification 5 can obtain substantially the same effects as those of the atomizer of Embodiment 2.

[0088] (Variant 6)

[0089] Figure 11 This is a diagram showing the tip of the capillary tube of Modification 6 as viewed from the axial direction. Figure 11 , the atomizer of variant example 6 is described.

[0090] The atomizer of Modification 6 has a different shape of a capillary tube 30G from that of Embodiment 2. The other structures are substantially the same.

[0091] In Modification 6, the capillary 30G also has an outer shape including a plurality of corner portions 33 , specifically, a quadrangular cylindrical shape. The plurality of corner portions 33 are arranged within the circular shape formed by the inner peripheral surface of the nozzle portion 22 .

[0092] Even when configured as described above, the atomizer of Modification 6 can obtain substantially the same effects as those of the atomizer of Embodiment 2.

[0093] (Variant 7)

[0094] Figure 12 This is a diagram showing the tip of the capillary tube of Modification 7 as viewed from the axial direction. Figure 12 , the atomizer of variant example 7 is described.

[0095] The atomizer of Modification 7 has a different shape of a capillary tube 30H from that of Embodiment 2. The other structures are substantially the same.

[0096] In Modification 7, the capillary 30H also has an outer shape including a plurality of corners 33 , specifically, an octagonal tube shape curved so that each side bulges outward. The corners 33 are disposed within the circular shape formed by the inner circumference of the nozzle portion 22 .

[0097] Even when configured as described above, the atomizer of Modification 7 can obtain substantially the same effects as those of the atomizer of Embodiment 2.

[0098] (Variation 8)

[0099] Figure 13 This is a diagram showing the tip of the capillary tube of Modification 8 as viewed from the axial direction. Figure 13 , the atomizer of variant example 8 is described.

[0100] The nebulizer of Modification 8 has a different shape of a capillary tube 30I from that of Embodiment 2. The other structures are substantially the same.

[0101] In Modification 8, the capillary 30I also has an outer shape including a plurality of corner portions 33 , specifically, a triangular cylindrical shape. The plurality of corner portions 33 are arranged within the circular shape formed by the inner peripheral surface of the nozzle portion 22 .

[0102] Even when configured as described above, the atomizer of Modification 8 can obtain substantially the same effects as those of the atomizer of Embodiment 2.

[0103] (Note)

[0104] [Composition 1]

[0105] An atomizer, comprising:

[0106] a nozzle portion having a nozzle for ejecting gas; and

[0107] The capillary tube has a tip portion, the tip portion being arranged so as to protrude from the ejection port.

[0108] On the inner peripheral surface of the nozzle portion defining a portion of the ejection outlet, a plurality of protrusions are arranged in a circumferential direction and protrude radially inward of the ejection outlet.

[0109] The plurality of protrusions are arranged in a manner of defining an inscribed circle,

[0110] The capillary tube passes through the inner side of the inscribed circle.

[0111] [Composition 2]

[0112] In the atomizer according to Configuration 1, the number of the plurality of protrusions is three or more.

[0113] [Composition 3]

[0114] In the atomizer according to configuration 1 or 2, the plurality of protrusions are arranged in a circumferential direction at predetermined intervals.

[0115] [Composition 4]

[0116] In the atomizer according to any one of configurations 1 to 3, a distance between adjacent protrusions in the circumferential direction is smaller than an outer diameter of the capillary tube.

[0117] [Composition 5]

[0118] In the atomizer according to any one of configurations 1 to 4, the inner peripheral surface of the nozzle portion defining a portion of the ejection port has a plurality of bulging portions bulging outward from the inscribed circle.

[0119] The plurality of bulging portions are arranged along the circumferential direction,

[0120] The protrusion is located between bulges adjacent to each other in the circumferential direction.

[0121] [Composition 6]

[0122] An atomizer, comprising:

[0123] a nozzle portion having a nozzle for ejecting gas; and

[0124] The capillary tube has a tip portion, the tip portion being arranged so as to protrude from the ejection port.

[0125] The inner peripheral surface of the nozzle portion defining a portion of the ejection port is provided so as to be circular when viewed from the axial direction of the ejection port.

[0126] The capillary tube has an outer shape including a plurality of corners,

[0127] When viewed from the axial direction, the plurality of corners are located inside the circle.

[0128] [Composition 7]

[0129] In the nebulizer according to configuration 6, the capillary tube includes a flow path for the liquid sample to flow.

[0130] When viewed in the axial direction, the shape of the inner peripheral surface of the capillary tube defining the flow path is similar to the outer shape of the capillary tube.

[0131] While the embodiments of the present invention have been described, the embodiments disclosed herein are to be considered in all respects as illustrative and non-restrictive. The scope of the present invention is indicated by the claims, and is intended to encompass all modifications within the meaning and scope of the claims and equivalents thereof.

Claims

1. An atomizer, characterized in that: have: a nozzle portion having a nozzle for ejecting gas; and The capillary tube has a tip portion, the tip portion being arranged so as to protrude from the ejection port. On the inner peripheral surface of the nozzle portion defining a portion of the ejection outlet, a plurality of protrusions are arranged in a circumferential direction and protrude radially inward of the ejection outlet. The plurality of protrusions are arranged in a manner of defining an inscribed circle, The capillary tube passes through the inner side of the inscribed circle.

2. The atomizer according to claim 1, wherein The number of the plurality of protrusions is three or more.

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

4. The atomizer according to claim 1, wherein The interval between adjacent protrusions in the circumferential direction is smaller than the outer diameter of the capillary tube.

5. The atomizer according to any one of claims 1 to 4, characterized in that The inner peripheral surface of the nozzle portion defining a portion of the ejection port has a plurality of bulging portions bulging outward from the inscribed circle. The plurality of bulging portions are arranged along the circumferential direction, The protrusion is located between bulges adjacent to each other in the circumferential direction.

6. An atomizer, characterized in that: have: a nozzle portion having a nozzle for ejecting gas; and The capillary tube has a tip portion, the tip portion being arranged so as to protrude from the ejection port. The inner peripheral surface of the nozzle portion defining a portion of the ejection port is provided so as to be circular when viewed from the axial direction of the ejection port. The capillary tube has an outer shape including a plurality of corners, When viewed from the axial direction, the plurality of corners are located inside the circle.

7. The atomizer according to claim 6, characterized in that The capillary tube includes a flow path for the liquid sample to flow. When viewed in the axial direction, the shape of the inner peripheral surface of the capillary tube defining the flow path is similar to the outer shape of the capillary tube.

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