Carbonated water nozzle and carbonated water discharge device

Abstract

To provide a carbonated water nozzle and a carbonated water discharge device capable of discharging carbonated water with reduced air leakage.SOLUTION: In the carbonated water nozzle, the shaft member includes a first shaft portion and a second shaft portion. The fixing member includes a first fixing portion that fixes the first shaft portion, and a second fixing portion that is spaced apart from the second shaft portion. The second fixing portion faces the second shaft portion. A part of the annular member is located between the second shaft portion and the second fixing portion. The annular member has a central axis common to the shaft member. The first shaft portion has a first surface conforming to a first cylindrical surface and a second surface conforming to a second cylindrical surface having a different diameter than the first cylindrical surface. The first fixing portion has a third surface matching the first cylindrical surface, a fourth surface matching the second cylindrical surface, and a fifth surface facing the annular member. A first flow path which is a through-hole is formed in the first fixing portion. The annular member includes a first end surface, a first outer peripheral surface, and a first inner peripheral surface. The first end surface forms a second flow path with the fifth surface. The third flow path is formed between the first inner peripheral surface and the outer peripheral surface of the second shaft portion.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a carbonated water nozzle and a carbonated water dispensing device. [Background technology]

[0002] A carbonated water discharge device is known that includes a carbonated water nozzle and a supply unit that supplies carbonated water to the carbonated water nozzle (see Patent Document 1 below). In the carbonated water discharge device described in Patent Document 1, the carbonated water nozzle discharges carbonated water. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-060794 Summary of the Invention [Problem to be solved by the invention]

[0004] Carbonated water nozzles are required to dispense carbonated water with reduced gas loss. Gas loss is a phenomenon in which carbon dioxide contained in carbonated water turns into gas and escapes from the carbonated water. Carbonated water with reduced gas loss can prevent a reduction in the refreshing feeling that carbonated water gives to drinkers (reduced refreshing feeling).

[0005] The present disclosure provides a carbonated water nozzle and a carbonated water dispenser that can dispense carbonated water with reduced gas loss. [Means for solving the problem]

[0006] The carbonated water nozzle of the present disclosure dispenses carbonated water. The carbonated water nozzle comprises an axial member, a fixing member, and an annular member. The axial member has a central axis along a first direction and is rod-shaped. The axial member includes a first axial portion and a second axial portion. The second axial portion is aligned with the first axial portion in the first direction. The fixing member includes a first fixing portion and a second fixing portion. The first fixing portion fixes the first axial portion. The second fixing portion is positioned at a distance from the second axial portion in the radial direction of the axial member. The second fixing portion extends from the first fixing portion. The second fixing portion has an inner circumferential surface. The inner circumferential surface faces an outer circumferential surface of a portion of the second axial portion in the radial direction of the axial member. The annular member faces the second axial portion in the radial direction of the axial member. The annular member has an annular shape. The annular member includes a first region. The first region is located between the outer peripheral surface of the second shaft portion and the inner peripheral surface of the second fixed portion. The annular member has a common central axis with the shaft member by fixing the first region to the second fixed portion. The first shaft portion has a first surface and a second surface. The first surface matches the first cylindrical surface. The first cylindrical surface has a common central axis with the shaft member. The second surface matches the second cylindrical surface. The second cylindrical surface has a different diameter from the first cylindrical surface. The second cylindrical surface has a common central axis with the first cylindrical surface. The first fixed portion has a third surface, a fourth surface, and a fifth surface. The third surface matches the first cylindrical surface. The third surface matches the first cylindrical surface to fix the first surface. The fourth surface matches the second cylindrical surface. The fifth surface faces the annular member in the first direction. A first flow path is formed in the first fixed portion. The first flow path is a through hole that opens in the fifth surface. The annular member includes a first end face, a first outer peripheral surface, and a first inner peripheral surface. The first end face is located at a distance from the fifth surface in the first direction. The first end face forms a second flow path, which is a gap connecting to the first flow path, between the first end face and the fifth surface. The first end face is included in the first region. The first outer peripheral surface is connected to an edge of a region of the first end face that is close to the second fixed portion. The first outer peripheral surface is fixed to an inner peripheral surface of the second fixed portion. The first outer peripheral surface is included in the first region. The first inner peripheral surface is connected to an edge of a region of the first end face that is close to the second axial portion. The first inner peripheral surface is located at a distance from the outer peripheral surface of the second axial portion. The first inner peripheral surface forms a third flow path, which is a gap connecting to the second flow path, between the outer peripheral surface of the second axial portion. At least a portion of the first inner peripheral surface is included in the first region. [Effects of the Invention]

[0007] The carbonated water nozzle and carbonated water dispensing device of the present disclosure can dispense carbonated water with reduced gas loss from the outlet. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a front view of a specific example of an embodiment of a carbonated water dispensing device of the present disclosure. [Figure 2A] FIG. 2A is an exploded perspective view of the carbonated water discharge device shown in FIG. 1, depicting a state in which the shaft member, the fixing member, the annular member, and the buffer member are assembled. [Figure 2B] FIG. 2B is an exploded perspective view of the carbonated water dispensing device shown in FIG. 1, depicting the shaft member, the fixing member, the annular member, and the buffer member. [Figure 3A] 3A is a cross-sectional view of the carbonated water nozzle shown in FIG. 1. FIG. [Figure 3B] FIG. 3B is a cross-sectional view of the carbonated water nozzle shown in FIG. 1, with the flow of carbonated water indicated by thick arrows. [Figure 4] FIG. 4 is a cross-sectional view of a carbonated water nozzle of a first modified example. [Figure 5] FIG. 5 is a cross-sectional view of a carbonated water nozzle according to a second modified example. [Figure 6] FIG. 6 is a cross-sectional view of a carbonated water nozzle according to a third modified example. [Figure 7] FIG. 7 is a cross-sectional view of a carbonated water nozzle according to a fourth modified example. [Figure 8] FIG. 8 is a cross-sectional view of a carbonated water nozzle according to a fifth modified example. [Figure 9] FIG. 9 is a cross-sectional view of a carbonated water nozzle according to a sixth modified example. [Figure 10] FIG. 10 is a cross-sectional view of a carbonated water nozzle according to a seventh modified example. [Figure 11] FIG. 11 is a cross-sectional view of a carbonated water nozzle according to an eighth modified example. [Figure 12] FIG. 12 is a cross-sectional view of a carbonated water nozzle according to a ninth modified example. [Figure 13] FIG. 13 is a cross-sectional view of a carbonated water nozzle according to a tenth modified example. [Figure 14] FIG. 14 is a cross-sectional view of a nozzle for carbonated water in Comparative Example 1. As shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] [Outline of the embodiment]

[0010] (1) A carbonated water nozzle according to the present disclosure dispenses carbonated water. The carbonated water nozzle comprises an axial member, a fixing member, and an annular member. The axial member has a central axis along a first direction and is rod-shaped. The axial member includes a first axial portion and a second axial portion. The second axial portion is aligned with the first axial portion in the first direction. The fixing member includes a first fixing portion and a second fixing portion. The first fixing portion fixes the first axial portion. The second fixing portion is positioned at a distance from the second axial portion in the radial direction of the axial member. The second fixing portion extends from the first fixing portion. The second fixing portion has an inner circumferential surface. The inner circumferential surface faces the outer circumferential surface of a portion of the second axial portion in the radial direction of the axial member. The annular member faces the second axial portion in the radial direction of the axial member. The annular member has an annular shape. The annular member includes a first region. The first region is located between the outer peripheral surface of the second shaft portion and the inner peripheral surface of the second fixed portion. The annular member has a common central axis with the shaft member by fixing the first region to the second fixed portion. The first shaft portion has a first surface and a second surface. The first surface matches the first cylindrical surface. The first cylindrical surface has a common central axis with the shaft member. The second surface matches the second cylindrical surface. The second cylindrical surface has a different diameter from the first cylindrical surface. The second cylindrical surface has a common central axis with the first cylindrical surface. The first fixed portion has a third surface, a fourth surface, and a fifth surface. The third surface matches the first cylindrical surface. The third surface matches the first cylindrical surface to fix the first surface. The fourth surface matches the second cylindrical surface. The fifth surface faces the annular member in the first direction. A first flow path is formed in the first fixed portion. The first flow path is a through hole that opens in the fifth surface. The annular member includes a first end face, a first outer peripheral surface, and a first inner peripheral surface. The first end face is located at a distance from the fifth surface in the first direction. The first end face forms a second flow path, which is a gap connecting to the first flow path, between the first end face and the fifth surface. The first end face is included in the first region. The first outer peripheral surface is connected to an edge of a region of the first end face that is close to the second fixed portion. The first outer peripheral surface is fixed to an inner peripheral surface of the second fixed portion. The first outer peripheral surface is included in the first region. The first inner peripheral surface is connected to an edge of a region of the first end face that is close to the second axial portion. The first inner peripheral surface is located at a distance from the outer peripheral surface of the second axial portion. The first inner peripheral surface forms a third flow path, which is a gap connecting to the second flow path, between the outer peripheral surface of the second axial portion. At least a portion of the first inner peripheral surface is included in the first region.

[0011] The carbonated water nozzle described in Patent Document 1 includes an axial member, a fixing member, and an annular member (see FIG. 14). The axial member has a central axis along a first direction and is rod-shaped. The axial member includes a first axial portion and a second axial portion aligned with the first axial portion in the first direction. The fixing member includes a first fixing portion and a second fixing portion. The first fixing portion fixes the first axial portion. The second fixing portion is positioned at a distance from the second axial portion in the radial direction of the axial member, extends from the first fixing portion, and has an inner circumferential surface facing the outer circumferential surface of a portion of the second axial portion in the radial direction of the axial member. The annular member faces the second axial portion in the radial direction of the axial member. The annular member is positioned between the outer circumferential surface of the second axial portion and the inner circumferential surface of the second fixing portion. The annular member is fixed to the second fixing portion. The first axial portion has a first surface. The first surface matches the first cylindrical surface. The first cylindrical surface has a central axis that coincides with the central axis of the axial member. The first fixing portion has a third surface. The third surface matches the first cylindrical surface. The annular member includes a first outer peripheral surface and a first inner peripheral surface. The first outer peripheral surface is fixed to the inner peripheral surface of the second fixing portion. The first inner peripheral surface is positioned at a distance from the outer peripheral surface of the second axial portion. A third flow path, which is a gap, is formed between the first inner peripheral surface and the outer peripheral surface of the second axial portion. In the carbonated water nozzle described in Patent Document 1, the precision of the gap in the third flow path is low. As a result, it is not possible to reduce the loss of air in the carbonated water passing through the third flow path.

[0012] However, in the carbonated water nozzle of the present disclosure, the first and third surfaces coincide with the first cylindrical surface, and the second and fourth surfaces coincide with the second cylindrical surface, which has a different diameter from the first cylindrical surface. In other words, the surface of the first shaft portion and the surface of the first fixing portion coincide with each of the two cylindrical surfaces with different diameters. This increases the accuracy of the gap in the third flow path. Specifically, the size of the gap in the third flow path can be made uniform in at least one of the circumferential direction and the first direction. As a result, carbonated water can be dispensed with reduced gas loss.

[0013] (2) In the above (1), the second surface may be offset from the first surface in the first direction. In this carbonated water nozzle, the precision of the gap of the third flow path can be further improved.

[0014] (3) In (1) or (2) above, the first fixing part may further include a seventh surface connecting the third surface and the fourth surface, and the first fixing part may have a second through hole formed therethrough in the first direction, the second through hole being defined by the third surface, the fourth surface, and the seventh surface. In this carbonated water nozzle, the third surface, the fourth surface, and the seventh surface that define the second through hole are easily formed.

[0015] (4) In any one of (1) to (3) above, the first shaft portion may include a first end portion that is an end portion of the shaft member in the first direction, and the first end portion may be included in the first fixing portion. In this carbonated water nozzle, since the first end portion is included in the first fixing portion, the first fixing portion can be easily connected by the connecting member.

[0016] (5) In any one of (1) to (4) above, the first surface may include a first threaded portion having a central axis along the first direction, the first shank may include a sixth surface intersecting the first surface, the third surface may include a second threaded portion that threadably engages with the first threaded portion and has a central axis along the first direction, and the first fixing portion may include a seventh surface that intersects with the third surface and is pressed against the sixth surface as a result of the second threaded portion threadably engaging with the first threaded portion. In this carbonated water nozzle, the first shank is more reliably fixed to the first fixing portion.

[0017] (6) In any one of (1) to (5) above, the length in the first direction of the first contact surface, which is the contact surface between the first surface and the third surface, may be longer than the length in the first direction of the second contact surface, which is the contact surface between the second surface and the fourth surface. When the second threaded portion starts to engage with the first threaded portion, the third and fourth surfaces have not yet coincided with the second cylindrical surface. Therefore, the second threaded portion can smoothly start to engage with the first threaded portion.

[0018] (7) A carbonated water nozzle according to the present disclosure dispenses carbonated water. The carbonated water nozzle comprises an axial member, a fixing member, and an annular member. The axial member has a central axis along a first direction and is rod-shaped. The axial member includes a first axial portion and a second axial portion. The second axial portion is aligned with the first axial portion in the first direction. The fixing member includes a first fixing portion and a second fixing portion. The first fixing portion fixes the first axial portion. The second fixing portion is positioned at a distance from the second axial portion in the radial direction of the axial member. The second fixing portion extends from the first fixing portion. The second fixing portion has an inner circumferential surface. The inner circumferential surface faces the outer circumferential surface of a portion of the second axial portion in the radial direction of the axial member. The annular member faces the second axial portion in the radial direction of the axial member. The annular member has an annular shape. The annular member includes a first region. The first region is located between the outer peripheral surface of the second shaft portion and the inner peripheral surface of the second fixed portion. The annular member has a common central axis with the shaft member by fixing the first region to the second fixed portion. The first shaft portion has a first surface and a second surface. The first surface matches the first cylindrical surface, and the first cylindrical surface has a common central axis with the shaft member. The second surface matches the second cylindrical surface. The second cylindrical surface has a different diameter from the first cylindrical surface. The second cylindrical surface has a common central axis with the first cylindrical surface. The first fixed portion has a third surface, a fourth surface, and a fifth surface. The third surface matches the first cylindrical surface. The third surface matches the first cylindrical surface to fix the first surface. The fourth surface matches the second cylindrical surface. The fifth surface faces the annular member in the first direction. A first flow path is formed in the first fixed portion. The first flow path is a through hole that opens in the fifth surface. The annular member includes a first end face, a first outer peripheral surface, and a first inner peripheral surface. The first end face is located at a distance from the fifth surface in the first direction. The first end face forms a second flow path, which is a gap connecting to the first flow path, between the first end face and the fifth surface. The first end face is included in the first region. The first outer peripheral surface is connected to an edge of a region of the first end face that is close to the inner peripheral surface of the second fixed portion. The first outer peripheral surface is fixed to the inner peripheral surface of the second fixed portion. The first outer peripheral surface is included in the first region. The first inner peripheral surface is connected to an edge of a region of the first end face that is close to the outer peripheral surface of the second axial portion. The first inner peripheral surface is located at a distance from the outer peripheral surface of the second axial portion. The first inner peripheral surface forms a third flow path, which is a gap connecting to the second flow path, between the first end face and the outer peripheral surface of the second axial portion. At least a portion of the first inner peripheral surface is included in the first region.

[0019] The second surface is offset from the first surface when viewed in the first direction. The first fixing portion further includes a seventh surface connecting the third surface and the fourth surface. A second through hole penetrating the first fixing portion in the first direction is formed. The second through hole is defined by the third surface, the fourth surface, and the seventh surface. The first shank includes a first end portion which is an end portion of the first shank portion in the first direction. The first end portion is included in the first fixing portion. The first surface includes a first threaded portion having a central axis along the first direction. The first shank includes a sixth surface intersecting with the first surface. The third surface is threadedly engaged with the first threaded portion and includes a second threaded portion having a central axis along the first direction. The seventh surface intersects with the third surface, and is pressed against the sixth surface by threading the second threaded portion into the first threaded portion. The length in the first direction of a first contact surface, which is a contact surface between the first surface and the third surface, is longer than the length in the first direction of a second contact surface, which is a contact surface between the second surface and the fourth surface.

[0020] (8) In any one of the above (1) to (7), the gap of the third flow path may be 0.2 mm or less. With this carbonated water nozzle, carbonated water can be discharged with even less air loss.

[0021] (9) In any one of the above (1) to (8), the shaft member, the fixing member, and the annular member may each be made of metal. In this carbonated water nozzle, the accuracy of the gap of the third flow path can be improved.

[0022] (10) In any one of (1) to (9) above, when the carbonated water nozzle is in use, the second shaft may be positioned vertically below the first shaft. In this carbonated water nozzle, the carbonated water can be passed vertically downward through the third flow path.

[0023] (11) In any one of (1) to (10) above, the shaft member may further include a third shaft portion. The third shaft portion may be located on the opposite side of the first shaft portion from the second shaft portion. The annular member may further include a second region. The second region may be aligned with the first region in the first direction. The second region may be located on the opposite side of the first fixing portion from the first region. The second region may include a second end face, a second outer peripheral surface, and at least a portion of the first inner peripheral surface. The second end face may be located on the opposite side of the first end face from the first end face in the first direction. The second outer peripheral surface may be connected to an edge of a region of the second end face that is far from the second shaft portion. At least a portion of the first inner peripheral surface may be connected to an edge of a region of the second end face that is close to the second shaft portion. The carbonated water nozzle may further include a buffer member. The buffer member may have an annular shape. The buffer member may be fixed to the third shaft portion so as to cover at least a portion of the second region. The buffer member may have an eighth surface and a second inner circumferential surface. The eighth surface may face the second end surface with a gap therebetween. The eighth surface may form a fourth flow path, which is a gap connecting to the third flow path, between the eighth surface and the second end surface. The second inner circumferential surface may face the second outer circumferential surface with a gap therebetween. The second inner circumferential surface may form a fifth flow path, which is a gap connecting to the fourth flow path, between the second outer circumferential surface. In this carbonated water nozzle, carbonated water that passes through the third flow path is turned back in the fourth flow path and reaches the fifth flow path. Therefore, the buffer member can weaken the momentum of carbonated water that has passed through the third flow path. As a result, carbonated water can be discharged with even less air loss.

[0024] (12) In the above (11), the buffer member may further have a third outer peripheral surface. The third outer peripheral surface may face radially outward from the shaft member. The carbonated water nozzle may further include a straightening member. The straightening member may have an annular shape. The straightening member may have a third inner peripheral surface. The third inner peripheral surface may face the third outer peripheral surface with a gap in the radial direction of the shaft member. The third inner peripheral surface may form a sixth flow path, which is a gap connecting to the fifth flow path, between itself and the third outer peripheral surface. In this carbonated water nozzle, the carbonated water that passes through the fifth flow path is turned around again before reaching the sixth flow path. Therefore, the straightening member can straighten the flow of the carbonated water.

[0025] (13) In the above (12), the gap of the fifth flow path may be larger than the gap of the third flow path. The gap of the sixth flow path may be larger than the gap of the fifth flow path. With this carbonated water nozzle, carbonated water can be ejected with even less air loss.

[0026] (14) A carbonated water dispenser according to the present disclosure includes a carbonated water nozzle according to any one of (1) to (13) above and a supply unit that supplies carbonated water to the first flow path of the carbonated water nozzle. Because the carbonated water dispenser includes the carbonated water nozzle described above, it can dispense carbonated water with reduced gas loss.

[0027] [Specific example of embodiment] The carbonated water nozzle and carbonated water dispensing device of the present disclosure will be described with reference to Figures 1 to 3B. Figure 1 is a front view of a specific example of an embodiment of the carbonated water dispensing device of the present disclosure. Figures 2A and 2B are each exploded perspective views of the carbonated water dispensing device shown in Figure 1. Figure 2A depicts the state in which the shaft member, fixing member, annular member, and buffer member are assembled. Figure 2B depicts each of the shaft member, fixing member, annular member, and buffer member. Figures 3A and 3B are each cross-sectional views of the carbonated water nozzle shown in Figure 1. In Figure 3B, the flow of carbonated water is indicated by thick arrows.

[0028] [Carbonated water dispenser 1] As shown in FIG. 1, the carbonated water discharge device 1 includes a carbonated water nozzle 2 and a supply unit 3.

[0029] [Carbonated water nozzle 2] The carbonated water nozzle 2 dispenses carbonated water. As shown in Figures 2A and 2B, the carbonated water nozzle 2 includes an axial member 4, a fixing member 5, an annular member 6, a buffer member 7, a flow rectifying member 8 (see Figure 2A), and a connecting member 9 (see Figure 1).

[0030] [Shaft member 4] As shown in FIG. 2B , the shaft member 4 has a central axis A1 along the first direction D1. The shaft member 4 has a rod shape. Specifically, the shaft member 4 has a cylindrical shape with the central axis A1 along the first direction D1. The shaft member 4 includes a first shaft portion 41, a second shaft portion 42, and a third shaft portion 43. The second shaft portion 42 is aligned with the first shaft portion 41 in the first direction D1. The third shaft portion 43 is located on the opposite side of the first shaft portion 41 from the second shaft portion 42. In the shaft member 4, the first shaft portion 41, the second shaft portion 42, and the third shaft portion 43 are aligned in this order in the first direction D1.

[0031] [Fixed part 5] The fixing member 5 fixes the shaft member 4.

[0032] [Annular member 6] The annular member 6 faces the second shaft portion 42 in the radial direction of the shaft member 4. The annular member 6 has an annular shape.

[0033] [Buffer member 7, rectifying member 8 and connecting member 9] The buffer member 7 is attached to the third shaft portion 43. As shown in Fig. 2A, the rectifying member 8 is attached to a connecting member 9, which will be described next.

[0034] [Details of Carbonated Water Nozzle 2] Each component of the carbonated water nozzle 2 will be described in detail below.

[0035] [Details of shaft member 4] As shown in FIG. 3A, the shaft member 4 has a first end E1 which is the end of the shaft member 4 in the first direction D1, and a second end E2 which is the end of the shaft member 4 located away from the first end E1.

[0036] [First shaft portion 41] The first shaft portion 41 includes a first end portion E1. The first shaft portion 41 has a first surface 411, a second surface 412, and a sixth surface 413. The first surface 411 coincides with the first cylindrical surface 21. The first cylindrical surface 21 has a common central axis A1 with the shaft member 4. The first surface 411 includes a first thread portion 4111. The first thread portion 4111 is a screw thread.

[0037] The second surface 412 matches the second cylindrical surface 22. No threads are formed on the second surface 412. The second cylindrical surface 22 has a diameter different from that of the first cylindrical surface 21. Specifically, the second cylindrical surface 22 has a larger diameter than the first cylindrical surface 21. The ratio of the diameter of the second cylindrical surface 22 to the diameter of the first cylindrical surface 21 is 1.3 or more and 3 or less. The second cylindrical surface 22 and the first cylindrical surface 21 share a central axis A1. The second surface 412 is offset from the first surface 411 in the first direction D1. In a projection plane projected radially outward from the central axis A1, the second surface 412 is located on the second shaft portion 42 side relative to the first surface 411.

[0038] The sixth surface 413 intersects with the first surface 411 and the second surface 412. When viewed from the first direction D1, the sixth surface 413 has an annular shape. The sixth surface 413 connects the edge of the first surface 411 in a region close to the second shaft portion 42 with the edge of the second surface 412 in a region far from the second shaft portion 42. When the carbonated water nozzle 2 is in use, the sixth surface 413 connects the lower edge of the first surface 411 with the upper edge of the second surface 412. When the carbonated water nozzle 2 is in use, the sixth surface 413 is aligned horizontally.

[0039] [Second shaft portion 42] The second shaft portion 42 is located between the first end E1 and the second end E2. The second shaft portion 42 has an outer peripheral surface 421. The outer peripheral surface 421 is continuous with the second surface 412. The outer peripheral surface 421 shares a central axis A1 with the first shaft portion 41. The outer peripheral surface 421 has a diameter slightly larger than that of the second surface 412. When the carbonated water nozzle 2 is in use, the outer peripheral surface 421 is located vertically below the second surface 412. In other words, when the carbonated water nozzle is in use, the second shaft portion 42 is located vertically below the first shaft portion 41.

[0040] [Third shaft 43] The third shaft portion 43 includes a second end E2. The third shaft portion 43 has a fifth outer peripheral surface 431. The fifth outer peripheral surface 431 has a common central axis A1 with the first shaft portion 41. The diameter of the fifth outer peripheral surface 431 is smaller than that of the outer peripheral surface 421. The fifth outer peripheral surface 431 includes a screw thread.

[0041] The shaft member 4 is made of metal, such as stainless steel.

[0042] [Details of fixed part 5] The fixing member 5 includes a first fixing portion 51 and a second fixing portion 52.

[0043] [First fixed part 51] The first fixing portion 51 is located at an end of the fixing member 5 in the first direction. The first fixing portion 51 has a plate shape along a plane S perpendicular to the first direction D1. Specifically, the first fixing portion 51 has a disk shape. As shown in FIG. 3A , the first shaft portion 41 is attached to the first fixing portion 51. The first fixing portion 51 fixes the first shaft portion 41. The first fixing portion 51 embeds the first end E1 of the shaft member 4. In other words, the first end E1 is contained within the first fixing portion 51. The first fixing portion 51 has a third surface 511, a fourth surface 512, a seventh surface 513, a fifth surface 514, and a ninth surface 515. The third surface 511 matches the first cylindrical surface 21. As a result, the first cylindrical surface 21 matches each of the two surfaces (the first surface 411 and the third surface 511). In other words, the first cylindrical surface 21 matches with the first surface of the first shaft portion 41 and the first surface of the first fixing portion 51. The third surface 511 matches with the first cylindrical surface 21 to fix the first surface 411. The third surface 511 includes a second threaded portion 5111. The second threaded portion 5111 includes a thread groove. The second threaded portion 5111 screws into the first threaded portion 4111.

[0044] The fourth surface 512 matches the second cylindrical surface 22. As a result, the second cylindrical surface 22 matches with each of the two surfaces (the second surface 412 and the fourth surface 512). In other words, the second cylindrical surface 22 matches with each of the second surfaces of the first shaft portion 41 and the first fixing portion 51. No threads are formed on the fourth surface 512. As shown in FIG. 3B , the length L1 in the first direction D1 of the first contact surface S1, which is the contact surface between the first surface 411 and the third surface 511, is longer than the length L2 in the first direction D1 of the second contact surface S2, which is the contact surface between the second surface 412 and the fourth surface 512. The ratio of the length L1 of the first contact surface S1 to the length L2 of the second contact surface S2 is 1.3 or more and 3 or less.

[0045] As shown in FIG. 3A , the seventh surface 513 intersects with each of the third surface 511 and the fourth surface 512. When viewed from the first direction D1, the seventh surface 513 has an annular shape. The seventh surface 513 connects the edge of a region of the third surface 511 that is close to the second fixing portion 52 with the edge of a region of the fourth surface 512 that is far from the second fixing portion 52. When the carbonated water nozzle 2 is in use, the seventh surface 513 connects the lower edge of the third surface 511 with the upper edge of the fourth surface 512. The seventh surface 513 is pressed against the sixth surface 413 as the second threaded portion 5111 threadably engages with the first threaded portion 4111. When the second screw portion 5111 is screwed into the first screw portion 4111, the seventh surface 513 is pressed from the sixth surface 413 in a direction from the second fixed portion 52 toward the first fixed portion 51.

[0046] The fifth surface 514 faces the annular member 6 in the first direction D1. The fifth surface 514 is perpendicular to the first direction D1. When the carbonated water nozzle 2 is in use, the fifth surface 514 is the underside of the first fixing portion 51. The ninth surface 515 is a flat surface. The fifth surface 514 is parallel to the seventh surface 513. The fifth surface 514 is connected to the edge of the fourth surface 512 in a region far from the third surface 511.

[0047] The ninth surface 515 is located on the opposite side of the fifth surface 514 in the first direction D1. When the carbonated water nozzle 2 is in use, the ninth surface 515 is the upper surface of the first fixing part 51. The ninth surface 515 is connected to an edge of the third surface 511 in a region far from the fourth surface 512.

[0048] [Through hole 53 and second through hole 54] A through hole 53 and a second through hole 54 are formed in the first fixing portion 51. The through hole 53 passes through the first fixing portion 51 in the first direction D1. The through hole 53 opens at the fifth surface 514 and the ninth surface 515. The through hole 53 is located in a radially intermediate region (a region between the center and the end) of the first fixing portion 51. When the carbonated water nozzle 2 is in use, the through hole 53 extends vertically.

[0049] The second through hole 54 penetrates the first fixing part 51 in the first direction D1. When the carbonated water nozzle 2 is in use, the second through hole 54 extends in the vertical direction. The second through hole 54 is defined by a third surface 511, a fourth surface 512, and a seventh surface 513. When viewed in the first direction D1, the second through hole 54 encompasses the central axis A1 of the fixing member 5.

[0050] [Second fixed part 52] The second fixing portion 52 is positioned at a distance from the second shaft portion 42 in the radial direction of the shaft member 4. The second fixing portion 52 extends from the first fixing portion 51. The second fixing portion 52 extends from the outer edge of the first fixing portion 51. The second fixing portion 52 has a cylindrical shape extending in the first direction D1. The second fixing portion 52 has an inner circumferential surface 521 and an outer circumferential surface 522. The inner circumferential surface 521 faces a portion of the outer circumferential surface 421 of the second shaft portion 42 in the radial direction of the shaft member 4. The fixing member 5 is made of metal. An example of the metal is stainless steel.

[0051] [Details of Annular Member 6] The annular member 6 includes a first region 61, a second region 62, and a third region 63. The first region 61, the third region 63, and the second region 62 are arranged in order in the first direction D1.

[0052] [First area 61] The first region 61 is located between the outer peripheral surface 421 of the second shaft portion 42 and the inner peripheral surface 521 of the second fixing portion 52. With the first region 61 fixed to the second fixing portion 52, the annular member 6 has a common central axis A1 with the shaft member 4. The first region 61 includes a first end face 611, a first outer peripheral surface 612, and a portion of a first inner peripheral surface 613. The first end face 611 is located spaced apart from the fifth surface 514 in the first direction D1. The first end face 611 includes a curved surface 6111 in a region close to the central axis A1. The curved surface 6111 curves toward the second region 62 as it approaches the central axis A1 of the annular member 6. Specifically, the curved surface 6111 has an arc shape in a cross section including the central axis A1.

[0053] The first outer peripheral surface 612 is connected to the edge of the first end face 611 in a region close to the second fixed portion 52. The first outer peripheral surface 612 is fixed to the inner peripheral surface 521 of the second fixed portion 52. The first outer peripheral surface 612 has a groove 6121. The groove 6121 extends along the circumferential direction of the annular member 6. A sealant 6122 is provided within the groove 6121. The sealant 6122 is made of rubber.

[0054] The first inner circumferential surface 613 is connected to the edge of the first end face 611 in a region close to the second shaft portion 42. Specifically, the first inner circumferential surface 613 is connected to the edge of the curved surface 6111. The first inner circumferential surface 613 is positioned with a gap between it and the outer circumferential surface 421 of the second shaft portion 42.

[0055] [Second area 62] The second region 62 is aligned with the first region 61 in the first direction D1. The second region 62 is located on the opposite side of the first fixing portion 51 from the first region 61. When the carbonated water nozzle 2 is in use, the second region 62 is located below the first region 61. The second region 62 includes a second end face 621, a second outer peripheral surface 622, and at least a portion of the first inner peripheral surface 613. The second end face 621 is located on the opposite side of the first end face 611 in the first direction D1.

[0056] The second outer peripheral surface 622 is connected to the edge of the second end face 621 in a region far from the second shaft portion 42. The second outer peripheral surface 622 has a common central axis A1 with the shaft member 4. The second outer peripheral surface 622 has a smaller diameter than the first outer peripheral surface 612. At least a portion of the first inner peripheral surface 613 in the second region 62 is connected to the edge of the second end face 621 in a region close to the second shaft portion 42.

[0057] [Third Area 63] The third region 63 is located between the first region 61 and the second region 62 in the first direction D1. The third region 63 includes a fourth outer peripheral surface 631, a first connecting surface 632, a second connecting surface 633, and a part of the first inner peripheral surface 613. The fourth outer peripheral surface 631 shares a central axis A1 with the shaft member 4. The fourth outer peripheral surface 631 has a larger diameter than the first outer peripheral surface 612. The first connecting surface 632 connects an edge of a region of the first outer peripheral surface 612 that is close to the second region 62 with an edge of a region of the fourth outer peripheral surface 631 that is close to the first region 61. The first connecting surface 632 is perpendicular to the central axis A1 of the annular member 6. The first connecting surface 632 contacts the tip surface of the second fixing portion 52 (the lower end surface of the carbonated water nozzle 2 when in use).

[0058] The second connecting surface 633 connects the edge of the second outer peripheral surface 622 in a region close to the first region 61 with the edge of the fourth outer peripheral surface 631 in a region close to the second region 62. The second connecting surface 633 is perpendicular to the central axis A1 of the annular member 6. The first inner peripheral surface 613 in the third region 63 connects the first inner peripheral surface 613 in the first region 61 with the first inner peripheral surface 613 in the second region 62. The first inner peripheral surface 613 included in the first region 61, the second region 62, and the third region 63 is a single surface (continuous surface). The annular member 6 is made of a metal. An example of the metal is stainless steel.

[0059] [Details of buffer member 7] As shown in FIGS. 2B and 3A, the buffer member 7 has an annular shape. In a cross section perpendicular to the central axis A1 of the shaft member 4, the buffer member 7 has a circular ring shape. The buffer member 7 shares the central axis A1 with the shaft member 4. In a cross section including the central axis A1, the buffer member 7 has a U-shape that opens toward the first shaft portion 41. The buffer member 7 is fixed to the third shaft portion 43 so as to cover at least a portion of the second region 62. The buffer member 7 has a fifth inner circumferential surface 71, an eighth surface 72, a second inner circumferential surface 73, a third end surface 74, and a third outer circumferential surface 75. The fifth inner circumferential surface 71 shares the central axis A1 with the shaft member 4. The fifth inner circumferential surface 71 includes a thread groove. The thread groove of the fifth inner circumferential surface 71 threadably engages with the thread of the fifth outer circumferential surface 431.

[0060] The eighth surface 72 faces the second end surface 621 of the annular member 6 with a gap therebetween. The eighth surface 72 is perpendicular to the central axis A1 of the fifth inner circumferential surface 71. The eighth surface 72 is connected to the edge of a region of the fifth inner circumferential surface 71 that is close to the first shaft portion 41. The eighth surface 72 has an annular shape when viewed in the first direction D1. The second inner circumferential surface 73 faces a portion of the second outer circumferential surface 622 of the annular member 6 with a gap therebetween. The second inner circumferential surface 73 is connected to the outer edge of the eighth surface 72. The second inner circumferential surface 73 shares a central axis A1 with the shaft member 4. The second inner circumferential surface 73 has a larger diameter than the fifth inner circumferential surface 71.

[0061] The third end surface 74 is connected to the edge of the second inner circumferential surface 73 in a region close to the first shaft portion 41. The third end surface 74 has an annular shape when viewed in the first direction D1. The third end surface 74 is perpendicular to the central axis A1. The third outer circumferential surface 75 is connected to the outer edge of the third end surface 74. The third outer circumferential surface 75 has a spindle shape. The third outer circumferential surface 75 faces radially outward of the shaft member 4. In a cross section perpendicular to the central axis A1, the third outer circumferential surface 75 has a diameter that decreases in a direction away from the first shaft portion 41. The third outer circumferential surface 75 is located outside the fifth inner circumferential surface 71 and the second inner circumferential surface 73 when viewed in the first direction D1. The buffer member 7 is made of a metal. An example of the metal is stainless steel.

[0062] [Details of flow straightening member 8] As shown in FIGS. 2A and 3A, the flow rectifying member 8 has an annular shape. Specifically, the flow rectifying member 8 has a cylindrical shape that extends along the first direction D1. The flow rectifying member 8 has a third inner circumferential surface 81. The third inner circumferential surface 81 has a central axis A1 that is common with the shaft member 4. The third inner circumferential surface 81 faces the third outer circumferential surface 75 in the radial direction of the shaft member 4 with a gap therebetween. The flow rectifying member 8 is made of a metal. An example of the metal is stainless steel.

[0063] [Details of connecting member 9] As shown in FIG. 3A, the connecting member 9 is attached to the fixing member 5. In a cross section including the central axis A1, the connecting member 9 has a U-shape that opens toward the buffer member 7. The connecting member 9 includes a first connecting portion 91 and a second connecting portion 92. The first connecting portion 91 is located on the opposite side of the second fixing portion 52 from the first fixing portion 51. The first connecting portion 91 has a disk shape that is perpendicular to the central axis A1 of the shaft member 4. The first connecting portion 91 has a tenth surface 911 and an eleventh surface 912. When the carbonated water nozzle 2 is in use, the tenth surface 911 is the upper surface. The eleventh surface 912 is located opposite the tenth surface 911. The first connecting portion 91 has a third through hole 913. The third through hole 913 opens at the tenth surface 911 and the eleventh surface 912. When the carbonated water nozzle 2 is in use, the third through-hole 913 is aligned in the vertical direction.

[0064] The second connecting portion 92 extends from the outer periphery of the first connecting portion 91. The second connecting portion 92 has a cylindrical shape with a common central axis A1 with the fixing member 5. The second connecting portion 92 is fixed to the outer periphery surface 522 of the second fixing portion 52. A portion of the inner periphery surface 81 of the rectifying member 8 is fixed to the second connecting portion 92. The connecting member 9 is made of metal. An example of the metal is stainless steel.

[0065] [First flow path 55, second flow path 56, third flow path 57, fourth flow path 58, fifth flow path 59, sixth flow path 60, and seventh flow path 601] The carbonated water nozzle 2 has a first flow path 55, a second flow path 56, a third flow path 57, a fourth flow path 58, a fifth flow path 59, a sixth flow path 60, and a seventh flow path 601. The first flow path 55 is a through-hole 53 in the first fixing portion 51.

[0066] The second flow path 56 is formed between the first end surface 611 and the fifth surface 514. The second flow path 56 is a gap connected to the first flow path 55.

[0067] The third flow passage 57 is formed between the first inner circumferential surface 613 in the first region 61, the second region 62, and the third region 63 and the outer circumferential surface 421 of the second shaft portion 42. The third flow passage 57 is a gap connecting to the second flow passage 56. The gap of the third flow passage 57 is 0.2 mm or less, preferably 0.15 mm or less. The gap of the third flow passage 57 is the length (width) between the first inner circumferential surface 613 and the outer circumferential surface 421 in the radial direction of the shaft member 4.

[0068] The fourth flow path 58 is formed between the eighth surface 72 and the second end surface 621. The fourth flow path 58 is a gap that connects to the third flow path 57 at the end.

[0069] The fifth flow path 59 is formed between the second inner circumferential surface 73 of the buffer member 7 and the second outer circumferential surface 622 of the second region 62 of the annular member 6. The fifth flow path 59 is a gap that connects to the fourth flow path 58. The gap of the fifth flow path 59 is larger than the gap of the third flow path 57.

[0070] The sixth flow path 60 is formed between the third inner circumferential surface 81 of the flow straightening member 8 and the third outer circumferential surface 75 of the buffer member 7. The sixth flow path 60 is a gap that connects to the fifth flow path 59. The gap of the sixth flow path 60 is larger than the gap of the fifth flow path 59.

[0071] The seventh flow path 601 is the third through-hole 913. The seventh flow path 601 is connected to the first flow path 55.

[0072] [Supply section 3] As shown in FIG. 1, the supply unit 3 is connected to the carbonated water nozzle 2. Specifically, the supply unit 3 is connected to the seventh flow path 601 (see FIG. 3A). As a result, the supply unit 3 supplies carbonated water to the first flow path 55 via the seventh flow path 601 (see FIG. 3A). The supply unit 3 includes a storage unit 31, a pipe 32, and a valve 33. The storage unit 31 stores carbonated water. The pipe 32 connects the storage unit 31 and the seventh flow path 601. The valve 33 is provided midway along the pipe 32.

[0073] In the carbonated water discharge device 1, carbonated water is supplied from the supply unit 3 to the carbonated water nozzle 2. As shown in FIG. 3B , the carbonated water passes through the seventh flow path 601, the first flow path 55, the second flow path 56, the third flow path 57, the fourth flow path 58, the fifth flow path 59, and the sixth flow path 60, in that order. In the seventh flow path 601, the first flow path 55, and the third flow path 57, the carbonated water flows downward in the vertical direction. In the second flow path 56, the carbonated water flows inward in the radial direction (toward the central axis A1). In the fourth flow path 58, the carbonated water flows outward in the radial direction. In the fifth flow path 59, the carbonated water flows upward in the vertical direction. In the sixth flow path 60, the carbonated water flows downward in the vertical direction. Thereafter, the carbonated water flows downward in the vertical direction along the third outer peripheral surface 75 of the buffer member 7.

[0074] [Variations] In the following modifications, the same components as those in the specific examples described above will be denoted by the same reference numerals, and the description thereof may be omitted as appropriate.

[0075] [First Modification] Fig. 4 is a cross-sectional view of the carbonated water nozzle of the first modified example. As shown in Fig. 4, first fixing portion 51 does not have second through-hole 54, but has recess 541. Recess 541 opens toward second shaft portion 42. Recess 541 is formed by third surface 511, fourth surface 512, and seventh surface 513.

[0076] [Second Modification] Fig. 5 is a cross-sectional view of a carbonated water nozzle of the second modified example. As shown in Fig. 5, the first end E1 of the shaft member 4 may not be embedded in the first fixing part 51, but may be located on the opposite side of the fifth surface 514 as viewed from the ninth surface 515.

[0077] [Third Modification] Fig. 6 is a cross-sectional view of a carbonated water nozzle of the third modified example. As shown in Fig. 6, fifth surface 514 may include seventh surface 513. Fifth surface 514 is connected to both third surface 511 and fourth surface 512.

[0078] [Fourth Modification] Fig. 7 is a cross-sectional view of a carbonated water nozzle of a fourth modified example. As shown in Fig. 7, in a projection plane projected radially outward from central axis A1, fifth surface 514 may be located on the opposite side of second shaft portion 42 from seventh surface 513.

[0079] [Fifth Modification] Fig. 8 is a cross-sectional view of a carbonated water nozzle of a fifth modified example. As shown in Fig. 8, first thread portion 4111 on first surface 411 may be a thread groove. As shown by the imaginary line in Fig. 8, a thread groove may also be formed on second shaft portion 42.

[0080] In a projection plane projected radially outward from the central axis A1, the second surface 412 is located on the opposite side of the second shaft portion 42 from the first surface 411. The second screw portion 5111 on the third surface 511 may be a screw thread.

[0081] [Sixth Modification] Fig. 9 is a cross-sectional view of a carbonated water nozzle of the sixth modified example. As shown in Fig. 9, fifth surface 514 may include seventh surface 513. Fifth surface 514 is connected to both third surface 511 and fourth surface 512.

[0082] [Seventh Modification] Fig. 10 is a cross-sectional view of a carbonated water nozzle of Modification 7. As shown in Fig. 10, in a projection plane projected radially outward from central axis A1, fifth surface 514 may be located on the opposite side of fourth surface 512 with respect to seventh surface 513.

[0083] [Eighth Modification] Fig. 11 is a cross-sectional view of a carbonated water nozzle of an eighth modified example. As shown in Fig. 11, second shaft portion 42 may further include a twelfth surface 423. Twelfth surface 423 connects second surface 412 of first shaft portion 41 and outer peripheral surface 421 of second shaft portion 42. Twelfth surface 423 is perpendicular to first direction D1. Outer peripheral surface 421 has a larger diameter than second surface 412.

[0084] [Ninth Variation] Fig. 12 is a cross-sectional view of a carbonated water nozzle of a ninth modified example. As shown in Fig. 12, second surface 412 is disposed radially outward from first surface 411. Second surface 412 overlaps with first surface 411 in a projection plane when projected radially outward from central axis A1 of fixing member 5. Second surface 412 faces radially outward.

[0085] [Tenth Modification] Fig. 13 is a cross-sectional view of a carbonated water nozzle of the tenth modified example. As shown in Fig. 13, the second surface 412 faces radially outward from (all or part of) the first surface 411. The second surface 412 faces the central axis A1 of the shaft member 4. The second surface 412 is the inner circumferential surface of a ring portion 415 that protrudes from the outer edge of the sixth surface 413.

[0086] [Other variations] The first fixing portion 51 may fix the first shaft portion 41 by locking or caulking other than by screwing together the threads and grooves. [Example]

[0087] The present disclosure will be described in more detail below with reference to examples and comparative examples. [Example 1] A carbonated water discharge device 1 according to the above specific example was prepared (see Figures 1 to 3A). The gap of the third flow path 57 was 0.115 mm. Then, carbonated water was discharged from the carbonated water nozzle 2. After that, the amount of carbon dioxide gas contained in the discharged carbonated water was measured and found to be 4.7 GV (gas volume).

[0088] [Comparative Example 1] A carbonated water discharge device 1 was prepared according to Figure 14. Figure 14 is a cross-sectional view of a carbonated water nozzle of Comparative Example 1. In the carbonated water nozzle 2 of Comparative Example 1, the first shaft portion 41 did not include the second surface 412, and the first fixing portion 51 did not include the fourth surface 512. Next, carbonated water was discharged from the carbonated water nozzle 2. Thereafter, the amount of carbon dioxide gas contained in the discharged carbonated water was measured and found to be 2.0 GV (gas volume). The amount of gas released from the carbonated water in Example 1 was reduced compared to the amount of gas released from the carbonated water in Comparative Example 1.

[0089] The embodiments of the present disclosure are illustrative in all respects and should not be construed as limiting in any respect. The scope of the present invention is defined by the claims, and it is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0090] 1 Carbonated water discharge device, 2 Carbonated water nozzle, 3 Supply portion, 4 Shaft member, 5 Fixing member, 6 Annular member, 7 Buffer member, 8 Straightening member, 9 Connecting member, 21 First cylindrical surface, 22 Second cylindrical surface, 31 Storage portion, 32 Supply line, 41 First shaft portion, 42 Second shaft portion, 43 Third shaft portion, 51 First fixing portion, 52 Second fixing portion, 53 Through hole, 54 Second through hole, 55 First flow path, 56 Second flow path, 57 Third flow path, 58 Fourth flow path, 59 Fifth flow path, 60 Sixth flow path, 61 First region, 62 Second region, 63 Third region, 71 Fifth inner circumferential surface, 72 Eighth surface, 73 Second inner circumferential surface, 74 Third end surface, 75 Third outer circumferential surface, 81 Third inner circumferential surface, 91 First connecting portion, 92 Second connecting portion, 411 First surface, 412 2nd surface, 413 6th surface, 415 Ring portion, 421 Outer peripheral surface, 423 12th surface, 431 5th outer peripheral surface, 511 3rd surface, 512 4th surface, 513 7th surface, 514 5th surface, 515 9th surface, 521 Inner peripheral surface, 541 Recess, 601 7th flow path, 611 1st end surface, 612 1st outer peripheral surface, 613 1st inner peripheral surface, 621 2nd end surface, 622 2nd outer peripheral surface, 631 4th outer peripheral surface, 632 1st connecting surface, 633 2nd connecting surface, 911 10th surface, 912 11th surface, 913 3rd through hole, 4111 1st thread portion, 5111 2nd thread portion, 6111 Curved surface, 6121 Groove, A1 Central axis, D1 First direction, E1 First end, E2 Second end, S Plane, S1 first contact surface, S2 second contact surface.

Claims

1. A carbonated water nozzle for discharging carbonated water, a rod-shaped shaft member having a central axis along a first direction, the shaft member including a first shaft portion and a second shaft portion aligned with the first shaft portion in the first direction; a fixing member including a first fixing portion that fixes the first shaft portion, and a second fixing portion that is positioned at a distance from the second shaft portion in the radial direction of the shaft member, extends from the first fixing portion, and has an inner peripheral surface that faces an outer peripheral surface of a portion of the second shaft portion in the radial direction of the shaft member; an annular member having an annular shape and facing the second shaft portion in the radial direction of the shaft member, the annular member including a first region located between the outer circumferential surface of the second shaft portion and the inner circumferential surface of the second fixing portion, the first region being fixed to the second fixing portion, and the annular member having a common central axis with the shaft member; The first shaft portion is a first surface that matches a first cylindrical surface having a common central axis with the shaft member; a second surface mating with a second cylindrical surface having a diameter different from that of the first cylindrical surface and having a common central axis with the first cylindrical surface; The first fixing portion is a third surface mating with the first cylindrical surface, the third surface mating with the first cylindrical surface thereby securing the first surface; a fourth surface mating with the second cylindrical surface; and a fifth surface facing the annular member in the first direction, a first flow path that is a through hole that opens in the fifth surface is formed in the first fixed portion; The annular member is a first end surface that is positioned at an interval from the fifth surface in the first direction, that forms a second flow path between the fifth surface and the first end surface, the second flow path being a gap that connects to the first flow path, and that is included in the first region; a first outer peripheral surface connected to an edge of a region of the first end surface close to the second fixed portion, fixed to the inner peripheral surface of the second fixed portion, and included in the first region; A nozzle for carbonated water comprising: a first inner surface connected to the edge of a region of the first end face that is close to the second shaft portion, positioned at a distance from the outer peripheral surface of the second shaft portion, forming a third flow path that is a gap connecting to the second flow path between the outer peripheral surface of the second shaft portion, and at least a portion of which is included in the first region.

2. The carbonated water nozzle of claim 1 , wherein the second surface is offset from the first surface in the first direction.

3. the first fixing portion further includes a seventh surface connecting the third surface and the fourth surface, a second through-hole penetrating through the first fixing portion in the first direction; The carbonated water nozzle of claim 1 , wherein the second through hole is defined by the third surface, the fourth surface, and the seventh surface.

4. the first shaft portion includes a first end portion that is an end portion of the shaft member in the first direction, The carbonated water nozzle of claim 1 , wherein the first end is included in the first fixing portion.

5. the first surface includes a first thread portion having a central axis along the first direction, the first shaft portion includes a sixth surface that intersects with the first surface, the third surface includes a second threaded portion that is threadably engaged with the first threaded portion and has a central axis that is aligned with the first direction; The carbonated water nozzle of claim 1, wherein the first fixing portion includes a seventh surface that intersects with the third surface and is pressed against the sixth surface by threading the second threaded portion into the first threaded portion.

6. A carbonated water nozzle as described in claim 1, wherein the length in the first direction of the first contact surface, which is the contact surface between the first surface and the third surface, is longer than the length in the first direction of the second contact surface, which is the contact surface between the second surface and the fourth surface.

7. A carbonated water nozzle for discharging carbonated water, a rod-shaped shaft member having a central axis along a first direction, the shaft member including a first shaft portion and a second shaft portion aligned with the first shaft portion in the first direction; a fixing member including a first fixing portion that fixes the first shaft portion, and a second fixing portion that is positioned at a distance from the second shaft portion in the radial direction of the shaft member, extends from the first fixing portion, and has an inner peripheral surface that faces an outer peripheral surface of a portion of the second shaft portion in the radial direction of the shaft member; an annular member having an annular shape and facing the second shaft portion in the radial direction of the shaft member, the annular member including a first region located between the outer circumferential surface of the second shaft portion and the inner circumferential surface of the second fixing portion, the first region being fixed to the second fixing portion, and the annular member having a common central axis with the shaft member; The first shaft portion is a first surface that matches a first cylindrical surface having a central axis that coincides with the central axis of the shaft member; a second surface mating with a second cylindrical surface having a diameter different from that of the first cylindrical surface and having a common central axis with the first cylindrical surface; The first fixing portion is a third surface mating with the first cylindrical surface, the third surface mating with the first cylindrical surface thereby securing the first surface; a fourth surface mating with the second cylindrical surface; and a fifth surface facing the annular member in the first direction, a first flow path that is a through hole that opens in the fifth surface is formed in the first fixed portion; The annular member is a first end surface that is positioned at an interval from the fifth surface in the first direction, that forms a second flow path between the fifth surface and the first end surface, the second flow path being a gap that connects to the first flow path, and that is included in the first region; a first outer peripheral surface connected to an edge of a region of the first end surface close to the second fixed portion, fixed to the inner peripheral surface of the second fixed portion, and included in the first region; a first inner circumferential surface connected to an edge of a region of the first end surface that is close to the second shaft portion, positioned at a distance from an outer circumferential surface of the second shaft portion, forming a third flow path that is a gap connecting to the second flow path between the outer circumferential surface of the second shaft portion and the first inner circumferential surface, at least a portion of which is included in the first region; the second surface is misaligned with the first surface when viewed in the first direction, the first fixing portion further includes a seventh surface connecting the third surface and the fourth surface, a second through-hole penetrating through the first fixing portion in the first direction; the second through hole is defined by the third surface, the fourth surface, and the seventh surface; the first shaft portion includes a first end portion that is an end portion of the shaft member in the first direction, The first end is included in the first fixing portion, the first surface includes a first thread portion having a central axis along the first direction, the first shaft portion includes a sixth surface that intersects with the first surface, the third surface includes a second threaded portion that is threadably engaged with the first threaded portion and has a central axis that is aligned with the first direction; the seventh surface intersects with the third surface, and the second threaded portion is pressed against the sixth surface by being threadedly engaged with the first threaded portion; A nozzle for carbonated water, wherein the length in the first direction of a first contact surface, which is the contact surface between the first surface and the third surface, is longer than the length in the first direction of a second contact surface, which is the contact surface between the second surface and the fourth surface.

8. The carbonated water nozzle according to claim 1 or claim 7, wherein the gap of the third flow path is 0.2 mm or less.

9. The carbonated water nozzle according to claim 1 or claim 7, wherein the shaft member, the fixing member, and the annular member are each made of metal.

10. 8. The carbonated water nozzle according to claim 1, wherein, when the carbonated water nozzle is in use, the second shaft portion is positioned vertically below the first shaft portion.

11. the shaft member further includes a third shaft portion located on the opposite side of the first shaft portion from the second shaft portion, the annular member further includes a second region aligned with the first region in the first direction and located on an opposite side of the first fixing portion from the first region, The second region is a second end surface located on the opposite side of the first end surface in the first direction; a second outer peripheral surface connected to an edge of the second end surface in a region far from the second shaft portion; at least a portion of the first inner circumferential surface, the portion being connected to an edge of the second end surface in a region close to the second shaft portion; Including, The carbonated water nozzle further includes a buffer member having an annular shape and fixed to the third shaft portion so as to cover at least a portion of the second region, The buffer member is an eighth surface that faces the second end surface with a gap therebetween and forms a fourth flow path that is a gap connected to the third flow path between the eighth surface and the second end surface; A nozzle for carbonated water as described in claim 1 or claim 7, having a second inner surface that faces the second outer peripheral surface with a gap therebetween and forms a fifth flow path that is a gap connected to the fourth flow path between the second outer peripheral surface and the second inner surface.

12. the buffer member further has a third outer circumferential surface facing radially outward of the shaft member, The carbonated water nozzle further includes a straightening member having an annular shape, A carbonated water nozzle as described in claim 11, wherein the straightening member has a third inner peripheral surface that faces the third outer peripheral surface with a gap in the radial direction of the shaft member and forms a sixth flow path that is a gap between the third outer peripheral surface and the sixth flow path, which is connected to the fifth flow path.

13. The gap of the fifth flow path is larger than the gap of the third flow path, The carbonated water nozzle according to claim 12, wherein the gap of the sixth flow path is larger than the gap of the fifth flow path.

14. The carbonated water nozzle according to claim 1 or claim 7; a supply unit that supplies carbonated water to the first flow path of the carbonated water nozzle; A carbonated water dispensing device comprising:

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