Mist blower and manufacturing method of liquid nozzle

Abstract

To provide a technique which can atomize liquid.SOLUTION: A mist blower comprises: a liquid tank which pools liquid; a fan; a discharge pipe into which air sent out from the fan flows; a liquid nozzle body which is arranged in the discharge pipe to discharge the liquid pooled in the liquid tank into the discharge pipe; and a counter body which is separated from the liquid nozzle body. The liquid nozzle body includes: a liquid passage with a contraction part having a minimum diameter through which the liquid passes; and a nozzle side face on which air sent out from the fan flows. The liquid is discharged from a discharge port of the contraction part. The counter body includes: a counter face which is arranged facing the discharge port; and a counter body side face which is connected with the counter face and where air sent out from the fan flows.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The technology disclosed herein relates to a method of manufacturing a mist blower and a liquid nozzle. [Background technology]

[0002] Patent Document 1 discloses a mist blower. The mist blower includes a liquid tank for storing liquid, a fan, a discharge pipe through which air sent by the fan flows, and a liquid nozzle disposed inside the discharge pipe for discharging the liquid stored in the liquid tank into the discharge pipe. The liquid nozzle has a discharge port for discharging the liquid to the outside of the liquid nozzle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-91023 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the mist blower described above, the liquid discharged from the discharge port usually moves along the front end face to the corner of the liquid nozzle, and then leaves the liquid nozzle at the corner to be atomized. Meanwhile, a portion of the liquid discharged from the discharge port does not move along the front end face toward the corner, but leaves the front end face immediately after discharge to be misted. The particle size of the liquid that leaves the front end face near the discharge port is larger than the particle size of the liquid that is atomized at the corner of the liquid nozzle. This specification provides a technology that can atomize liquid. [Means for solving the problem]

[0005] This specification discloses a mist blower. The mist blower includes a liquid tank for storing liquid, a fan, a discharge pipe through which air sent by the fan flows, a liquid nozzle body disposed inside the discharge pipe and discharging the liquid stored in the liquid tank into the discharge pipe, and an opposing body separated from the liquid nozzle body. The liquid nozzle body includes a throttle portion having a minimum diameter, a liquid passage through which the liquid passes, and a nozzle side surface through which the air sent by the fan flows. The liquid is discharged from the discharge port of the throttle portion. The opposing body includes an opposing surface disposed opposite the discharge port, and an opposing body side surface connected to the opposing surface and through which the air sent by the fan flows.

[0006] According to the above configuration, the liquid discharged from the discharge port hits the opposing surface of the opposing body and moves on the opposing surface to the side of the opposing body. The liquid is then separated from the opposing body by the air sent by the fan. This allows the liquid to be atomized.

[0007] This specification discloses a method for manufacturing a liquid nozzle. The liquid nozzle discharges liquid stored in a liquid tank to a discharge pipe through which air flows. The liquid nozzle includes a base body having a through hole extending in a first direction through which the liquid passes, and a press-in body that can be press-fitted into the base body. The through hole includes a throttling portion having a smallest diameter in the through hole, a first hole portion having a diameter larger than the diameter of the throttling portion, and a second hole portion that is disposed on the opposite side of the throttling portion from the first hole portion and has a diameter larger than the diameter of the throttling portion. The manufacturing method includes a press-in process of press-fitting the press-in body into the second hole portion to a position a predetermined distance away from the throttling portion, and an opening forming process of cutting the base body in a second direction perpendicular to the first direction at a position between the throttling portion and the press-in body after the press-in process to form an opening that penetrates the base body from the side surface to the inner surface of the base body.

[0008] In the liquid nozzle manufactured by the above method, the liquid discharged from the throttle portion hits the press-in body and moves on the press-in body toward the opening. The liquid then exits the liquid nozzle from the opening. The liquid is moved away from the liquid nozzle by the air flowing around the liquid nozzle. This allows the liquid to be atomized. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a working machine 2 of a first embodiment. [Diagram 2] FIG. 2 is an exploded perspective view of the working machine 2 of the first embodiment. [Diagram 3] 1 is a perspective view of the working machine 2 of the first embodiment when a cover portion 28 is open. [Figure 4] 2 is an exploded perspective view of a fan unit 18 and a control unit 20 according to the first embodiment. FIG. [Diagram 5] FIG. 2 is a perspective view of the emission pipe 10 of the first embodiment. [Figure 6] FIG. 2 is a perspective view of the liquid tank 24, the discharge tube 88, and the supply line 90 of the first embodiment. [Figure 7] 1 is a cross-sectional perspective view of a discharge pipe 10, a cylindrical member 120, and a liquid nozzle 122 of the first embodiment. [Figure 8] FIG. 2 is a perspective view of a liquid nozzle 122 according to the first embodiment. [Figure 9] 4 is a cross-sectional view of the second supply pipe 102 and the liquid nozzle 122 of the first embodiment. FIG. [Figure 10] 2 is a cross-sectional view of the vicinity of the front end of the liquid nozzle 122 of the first embodiment. FIG. [Figure 11] 2 is a cross-sectional view of a corner 188 of the liquid nozzle 122 of the first embodiment. [Figure 12] 2 is a cross-sectional view of the vicinity of a connector 136 of a liquid nozzle 122 of the first embodiment. FIG. [Figure 13] 3A to 3C are cross-sectional views of the liquid nozzle 122, illustrating a manufacturing method of the liquid nozzle 122 of the first embodiment. [Figure 14] 3A to 3C are cross-sectional views of the liquid nozzle 122, illustrating a manufacturing method of the liquid nozzle 122 of the first embodiment. [Figure 15] 13 is a cross-sectional view of the vicinity of the front end of a liquid nozzle 122 of a second embodiment. FIG. [Figure 16] 13 is a cross-sectional view of the vicinity of a connector 136 of a liquid nozzle 122 of a third embodiment. FIG. [Figure 17] 13 is a cross-sectional view of the vicinity of an opposing body front end surface 184 of an opposing body 134 of a fourth embodiment. FIG. [Figure 18] FIG. 13 is a cross-sectional view of a corner 188 of a liquid nozzle 122 of the fifth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Representative and non-limiting examples of the present invention are described in detail below with reference to the drawings. This detailed description is intended simply to provide those skilled in the art with details for implementing the preferred examples of the present invention, and is not intended to limit the scope of the present invention. In addition, the additional features and inventions disclosed can be used separately or together with other features and inventions to provide further improved mist blowers and methods for manufacturing liquid nozzles used therein.

[0011] In addition, the combinations of features and steps disclosed in the following detailed description are not essential for implementing the present invention in the broadest sense, but are specifically described only to illustrate representative embodiments of the present invention. Furthermore, the various features of the following representative embodiments and the various features described in the claims do not have to be combined in the exact manner of the embodiments described herein or in the order listed in order to provide additional and useful embodiments of the present invention.

[0012] All features described in the specification and / or claims are intended to be disclosed individually and independently of one another as limitations to the specific features described in the original disclosure and claims, apart from the configuration of features described in the examples and / or claims. Furthermore, all numerical ranges and group or aggregate descriptions are intended to disclose intermediate configurations thereof as limitations to the specific features described in the original disclosure and claims.

[0013] In one or more embodiments, the nozzle side may have a circular shape having a first diameter. The counterbody side may have a circular shape having a second diameter. The second diameter may be greater than or equal to 60% and less than or equal to 100% of the first diameter.

[0014] According to the above configuration, even if the air flows along the nozzle side surface of the liquid nozzle body and then along the opposing body side surface of the opposing body, a decrease in the flow rate of the air can be suppressed, thereby making it possible to further atomize the liquid.

[0015] In one or more embodiments, the mist blower may further include a connector connecting the liquid nozzle body and the opposing body.

[0016] According to the above-mentioned configuration, the position of the opposing body with respect to the liquid nozzle body can be fixed, thereby enabling the liquid to be stably atomized.

[0017] In one or more embodiments, the length of the outer surface of the connecting body in the circumferential direction of the opposing body side surface may be 50% or less of the length of the opposing body side surface.

[0018] According to the above-mentioned configuration, the liquid can be moved around the entire circumference of the side surface of the opposing body, thereby enabling the liquid to be further atomized.

[0019] In one or more embodiments, the connector may be integrally formed with the counter body and separate from the liquid nozzle body.

[0020] According to the above-described configuration, the liquid nozzle body, the opposing body, and the connecting body can be easily manufactured.

[0021] In one or more embodiments, the distance between the opposing surface and the liquid nozzle body may be greater than or equal to 200% and less than or equal to 600% of the diameter of the constriction.

[0022] According to the above configuration, when the distance between the opposing surface and the liquid nozzle body is less than 200% of the diameter of the throttling portion, the liquid discharged from the discharge port accumulates between the liquid nozzle body and the opposing body, and atomization of the liquid is suppressed. On the other hand, when the distance between the opposing surface and the liquid nozzle body is greater than 600% of the diameter of the throttling portion, the flow rate of the air flowing along the opposing body side surface of the opposing body decreases compared to a configuration in which the distance between the opposing surface and the liquid nozzle body is 600% or less of the diameter of the throttling portion. This suppresses atomization of the liquid. According to the above configuration, the liquid can be atomized.

[0023] (First embodiment) As shown in FIG. 1, the working machine 2 is a backpack-type working machine. The working machine 2 is configured to discharge (spray) liquid. The working machine 2 is, for example, a mist blower. The working machine 2 includes a main body unit 4, a frame unit 6, a harness unit 8, a discharge pipe 10, and a handle unit 12. The frame unit 6 is attached to the main body unit 4. The harness unit 8 is attached directly and / or indirectly to the main body unit 4. The discharge pipe 10 is attached to the lower right side of the main body unit 4. The handle unit 12 is attached to the discharge pipe 10. In a state where the user wears the harness unit 8 and carries the working machine 2 on his / her back, the user grasps the handle unit 12 and moves the discharge pipe 10 to spray liquid from the discharge pipe 10. In the following, the up-down direction, the front-rear direction, and the left-right direction of the working machine 2 correspond to the up-down direction, the front-rear direction, and the left-right direction as seen from the user carrying the working machine 2 on his / her back.

[0024] As shown in Fig. 2, the main unit 4 includes a main housing 16, a fan unit 18, a control unit 20, and a liquid tank 24. As shown in Fig. 3, the main housing 16 includes a main body portion 26 and a cover portion 28. The cover portion 28 is attached to the main body portion 26 so as to be rotatable around a rotation axis extending in the left-right direction.

[0025] As shown in Fig. 2, a first internal space 32 and a second internal space 34 are defined inside the main body 26. The fan unit 18 and the control unit 20 are arranged in the first internal space 32. As shown in Fig. 3, a cover 40 is attached near the lower part of the left side surface of the main body 26, and the first internal space 32 communicates with the outside of the work machine 2 through an air intake port 40a of the cover 40. The second internal space 34 communicates with the outside of the work machine 2 when the cover 28 is opened. As shown in Fig. 2, a plurality of battery packs BP (two in this embodiment) are arranged in the second internal space 34.

[0026] As shown in FIG. 4, the fan unit 18 includes a fan 44, an electric motor 46, a motor housing 48, a cover member 50, a cone 52, and a tubular member 54. The fan 44 is, for example, an axial fan. A shaft 46a of the electric motor 46 is connected to the fan 44. The electric motor 46 is operated by power from a battery pack BP (see FIG. 2). The electric motor 46 rotates the fan 44. The electric motor 46 is, for example, a brushless motor. The motor housing 48 accommodates the electric motor 46. A plurality of straightening fins 55 are formed on the outer surface of the motor housing 48. The cover member 50 closes the left end opening of the motor housing 48. The cone 52 is connected to the right end of the motor housing 48. The tubular member 54 has a substantially cylindrical shape. The tubular member 54 accommodates the fan 44, the electric motor 46, the motor housing 48, and the cover member 50 therein. The inner surface of the cylindrical member 54 is connected to a plurality of flow straightening fins 55. The cylindrical member 54 is supported by the main body housing 16 (see FIG. 2).

[0027] The control unit 20 is attached to the upper part of the cylindrical member 54. The control unit 20 includes a control board 56 having a plurality of switching elements (not shown) and a microcomputer. The control board 56 controls the rotation of the electric motor 46. The control board 56 is housed in a case 57. An opening 54a is formed in the upper part of the cylindrical member 54, and at least a portion of the lower surface of the case 57 covers the opening 54a of the cylindrical member 54. The case 57 is made of, for example, a metal material. The control unit 20 is covered by a cover member 58. The case 57 and the cover member 58 are attached to the cylindrical member 54.

[0028] The discharge pipe 10 shown in Fig. 1 is attached to the tubular member 54. The discharge pipe 10 is disposed on the right side of the main unit 4. The discharge pipe 10 includes a curved pipe 60 attached to the tubular member 54 (see Fig. 2), a bellows tube 62 attached to the curved pipe 60, an intermediate pipe 64 attached to the bellows tube 62, and a tip pipe 66 attached to the intermediate pipe 64. The bellows tube 62 is configured so that the orientations of the intermediate pipe 64 and the tip pipe 66 can be adjusted. A dome-shaped diffusion cover 70 is attached to the tip of the tip pipe 66.

[0029] As shown in FIG. 1, the handle unit 12 is attached to the intermediate tube 64. The handle unit 12 includes a grip portion 72, a trigger 74 attached to the grip portion 72, a head portion 76 connected to the grip portion 72, a main power button 78 disposed on the rear surface of the head portion 76, and an adjustment button 80 disposed on the upper surface of the head portion 76. A user can adjust the orientation of the intermediate tube 64 and the tip tube 66 by gripping the grip portion 72 and moving the handle unit 12. The main power button 78 accepts a user operation to switch between an on state and an off state of the work machine 2. The adjustment button 80 accepts a user operation to adjust the rotation speed of the electric motor 46 (see FIG. 4).

[0030] When the user presses the trigger 74 while the working machine 2 is in the on state, the control board 56 shown in FIG. 4 rotates the shaft 46a of the electric motor 46 by the power of the battery pack BP (see FIG. 2). This rotates the fan 44, and air flows from the outside of the working machine 2 into the first internal space 32 (see FIG. 2) through the multiple air intakes 40a (see FIG. 3). The air that flows in flows into the inside of the cylindrical member 54. As shown in FIG. 4, the air that flows in is sent out by the fan 44, rectified by the multiple rectifying fins 55, and then flows along the cone 52. Since at least a part of the lower surface of the case 57 blocks the opening 54a of the cylindrical member 54, the air sent out by the fan 44 flows along the lower surface of the case 57. This cools the case 57, and as a result, the control unit 20 (control board 56) is cooled. 5, passes through the diffusion cover 70, and is then discharged to the outside of the work machine 2. The air is guided by the diffusion fins 70a of the diffusion cover 70 to the radially outer side of the end pipe 66, and is discharged over a wide range.

[0031] 3, the liquid tank 24 is attached to the upper part of the main housing 16. The liquid tank 24 stores a liquid. The liquid is, for example, a chemical solution or water.

[0032] 6, a discharge part 84 and a supply part 86 are formed at the bottom end of liquid tank 24. A discharge tube 88 is connected to discharge part 84. When a user opens a discharge cock 89 on discharge tube 88, the liquid stored in liquid tank 24 is discharged to the outside of liquid tank 24 via discharge part 84 and discharge tube 88.

[0033] A supply line 90 is connected to the supply unit 86. The supply line 90 includes a first supply pipe 92, a first supply cock 94, an electromagnetic valve 96, a supply tube 98, a second supply cock 100 (see FIG. 5), a second supply pipe 102 (see FIG. 5), and a third supply cock 104 (see FIG. 5). When the work machine 2 is performing work, the first supply cock 94, the second supply cock 100, and the third supply cock 104 are open. As shown in FIG. 6, the first supply pipe 92 is connected to the supply unit 86 of the liquid tank 24. The first supply cock 94 and the electromagnetic valve 96 are disposed on the first supply pipe 92. The first supply cock 94 is operated by a user. The first supply cock 94 opens and closes the first supply pipe 92. Although not shown, the electromagnetic valve 96 is disposed inside the main body housing 16 (see FIG. 2). The solenoid valve 96 opens and closes under the control of the control board 56 (see FIG. 4).

[0034] The supply tube 98 is connected to the first supply pipe 92. As shown in Fig. 5, the supply tube 98 extends along the discharge pipe 10. The second supply cock 100 is disposed on the supply tube 98. The supply tube 98 is fixed to the discharge pipe 10 at a position where the second supply cock 100 is disposed. The second supply cock 100 is operated by a user. The second supply cock 100 opens and closes the supply tube 98.

[0035] As shown in FIG. 7, the second supply pipe 102 is connected to the supply tube 98. The tip tube 66 includes a first tip tube 67 and a second tip tube 68 attached to the front end of the first tip tube 67, and the second supply pipe 102 is formed integrally with the first tip tube 67. The second supply pipe 102 includes an outer portion 108, a first inner portion 110, and a second inner portion 112. The outer portion 108 is disposed outside the tip tube 66. The third supply cock 104 is disposed in the outer portion 108. The third supply cock 104 is operated by a user. The third supply cock 104 opens and closes the outer portion 108. The first inner portion 110 and the second inner portion 112 are disposed inside the tip tube 66. The first inner portion 110 extends downward from the lower end of the outer portion 108. The second inner portion 112 extends from the lower end of the first inner portion 110 toward the discharge opening 68a of the second end tube 68. When the first supply cock 94 (see FIG. 6), the solenoid valve 96 (see FIG. 6), the second supply cock 100 (see FIG. 5), and the third supply cock 104 are open, the liquid in the liquid tank 24 (see FIG. 5) can flow through the first supply pipe 92 (see FIG. 5), the supply tube 98, and the second supply pipe 102.

[0036] In the following, a case where the longitudinal direction of the tip tube 66 is aligned with the front-rear direction will be described as an example. The working machine 2 further includes a tubular member 120 and a liquid nozzle 122. The tubular member 120 is disposed inside the second tip tube 68. The tubular member 120 has a substantially cylindrical shape with a longitudinal direction. The tubular member 120 includes a front-side tubular portion 124 and a rear-side tubular portion 126. The front-side tubular portion 124 is connected to the second tip tube 68 via a plurality of fins 128. The front-side tubular portion 124, the plurality of fins 128, and the second tip tube 68 are integrally formed. The rear-side tubular portion 126 is disposed on the rear side of the front-side tubular portion 124. The rear-side tubular portion 126 is connected to the fins 128 and the second tip tube 68 by a screw. The diameter of the inner surface of the tubular member 120 becomes smaller toward the front side, and then becomes larger. A portion of the air flowing inside the tip tube 66 flows inside the tubular member 120 as indicated by arrow F1 in FIG. 7, and the remainder of the air flowing inside the tip tube 66 flows outside the tubular member 120 as indicated by arrow F2 in FIG. 7.

[0037] The liquid nozzle 122 is, for example, a nozzle of a high concentration low volume spray (Ultra Low Volume) type. The liquid nozzle 122 is disposed inside the second tip tube 68. The front end of the liquid nozzle 122 is disposed at a position closest to the discharge opening 68a of the second tip tube 68 (the frontmost side), and the rear end of the liquid nozzle 122 is disposed at a position farthest from the discharge opening 68a of the second tip tube 68 (the rearmost side). The front end of the liquid nozzle 122 corresponds to the tip of the liquid nozzle 122, and the rear end of the liquid nozzle 122 corresponds to the base end of the liquid nozzle 122. The liquid nozzle 122 has a longitudinal direction in the front-rear direction. The liquid nozzle 122 is made of a metal material, for example, brass. In a modified example, the liquid nozzle 122 may be made of a resin material.

[0038] As shown in FIG. 8, the liquid nozzle 122 includes a liquid nozzle body 132, an opposing body 134, and a connecting body 136. The liquid nozzle body 132 includes an insertion portion 140 and a nozzle portion 142. The insertion portion 140 has a substantially cylindrical shape. As shown in FIG. 9, an elastic member 144 is attached to the outer surface of the insertion portion 140. The elastic member 144 is, for example, an O-ring. In addition, a male screw portion 146 is formed on the outer surface of the insertion portion 140. A female screw portion 148 is formed on the inner surface of the second inner portion 112. The insertion portion 140 is connected to the second inner portion 112 by inserting the insertion portion 140 into the inner surface of the second inner portion 112 and screwing the male screw portion 146 of the insertion portion 140 into the female screw portion 148 of the second inner portion 112. Furthermore, when the insertion portion 140 is connected to the second inner portion 112, the elastic member 144 is sandwiched between the outer surface of the insertion portion 140 and the inner surface of the second inner portion 112. This creates a seal between the outer surface of the insertion portion 140 and the inner surface of the second inner portion 112.

[0039] The nozzle portion 142 is connected to the front end of the insertion portion 140. The nozzle portion 142 includes a nozzle side surface 150. The nozzle side surface 150 forms at least a part of the outer shape of the nozzle portion 142. As shown in FIG. 7, a part of the air flowing inside the tip tube 66 flows toward the front end of the liquid nozzle 122 along the nozzle side surface 150 as shown by the arrow F1. The nozzle side surface 150 includes a first nozzle side surface 152 and a second nozzle side surface 154. The diameter of the rear end of the first nozzle side surface 152 is approximately the same as the diameter of the outer surface of the second inner portion 112. The diameter of the first nozzle side surface 152 becomes smaller from the rear end to the front end of the nozzle portion 142. The first nozzle side surface 152 has a smooth curved shape. The second nozzle side surface 154 is disposed on the front side of the first nozzle side surface 152. The diameter of the second nozzle side surface 154 is approximately the same as the diameter of the front end of the first nozzle side surface 152, and is approximately constant in the front-rear direction. At least a portion of first nozzle side surface 152 and second nozzle side surface 154 are surrounded by rear barrel portion 126 .

[0040] As shown in Fig. 9, the liquid nozzle 122 further includes a liquid passage 158. The liquid passage 158 is disposed inside the insertion portion 140 and the nozzle portion 142. The liquid passage 158 extends from the rear end to the front end of the liquid nozzle 122. The liquid passage 158 is disposed on the central axis CX of the liquid nozzle 122. The central axis CX extends in the front-rear direction (the longitudinal direction of the liquid nozzle 122). The cross section of the liquid passage 158 has a substantially circular shape.

[0041] The liquid passage 158 includes an inlet passage 160, a first transition passage 162, a throttle passage 164, a second transition passage 166, and an outlet passage 168. The inlet passage 160 communicates with the internal space of the second inner portion 112. The diameter of the inlet passage 160 is, for example, 5 mm. The inlet passage 160 extends from the rear end of the insertion portion 140 to the front side. The inlet passage 160 is disposed across the insertion portion 140 and the nozzle portion 142.

[0042] As shown in FIG. 10, the first transition passage 162 is connected to the front end (tip) of the inlet passage 160. The diameter of the first transition passage 162 gradually decreases toward the front side. The throttle passage 164 is connected to the front end of the first transition passage 162. The diameter D1 of the throttle passage 164 is smaller than the diameter of the inlet passage 160. The diameter D1 of the throttle passage 164 is, for example, 0.5 mm. The front end of the throttle passage 164 corresponds to the discharge port 170. The discharge port 170 is disposed on the central axis CX. The second transition passage 166 is connected to the front end of the throttle passage 164. The diameter of the second transition passage 166 gradually increases toward the front side. The outlet passage 168 is connected to the front end of the second transition passage 166. The diameter of the outlet passage 168 is approximately the same as the diameter of the inlet passage 160. The outlet passage 168 extends to the front end surface 132a of the liquid nozzle body 132. The front end surface 132 a corresponds to the tip surface of the liquid nozzle body 132 .

[0043] The opposed body 134 is disposed forward of the front end surface 132a of the liquid nozzle body 132. The opposed body 134 is spaced from the front end surface 132a of the liquid nozzle body 132. This defines a space 174 between the opposed body 134 and the front end surface 132a of the liquid nozzle body 132. The opposed body 134 has a generally circular plate shape. The opposed body 134 includes a press-fitted body 176 having a generally cylindrical shape, and a press-fitted body 178 having a generally circular plate shape. The press-fitted body 178 is press-fitted into the press-fitted body 176. When the press-fitted body 178 is press-fitted into the press-fitted body 176, the diameter of the press-fitted body 178 is generally the same as the diameter of the outlet passage 168.

[0044] The opposing body 134 has an opposing surface 180, an opposing body side surface 182, and an opposing body front end surface 184. The opposing surface 180 faces the discharge port 170 of the liquid nozzle body 132. The opposing surface 180 is spaced apart from the front end surface 132a of the liquid nozzle body 132. The distance L1 between the opposing surface 180 and the front end surface 132a is 200% or more and 600% or less of the diameter D1 of the throttle passage 164, and in this embodiment, is set to 300% or more and 500% or less of the diameter D1. The opposing surface 180 has a substantially circular shape. The center of the circle of the opposing surface 180 is located on the central axis CX.

[0045] The opposing body side surface 182 corresponds to the side surface of the opposing body 134. The opposing body side surface 182 is connected to the opposing surface 180. The opposing body side surface 182 is approximately perpendicular to the opposing surface 180. The cross section of the opposing body side surface 182 has an approximately circular shape. The diameter of the opposing body side surface 182 is approximately the same as the diameter of the opposing surface 180. The diameter of the opposing body side surface 182 is 60% or more and 100% or less of the diameter of the front end of the second nozzle side surface 154 (the diameter of the front end surface 132a of the liquid nozzle main body 132). In this embodiment, the diameter of the opposing body side surface 182 is 100% of the diameter of the front end of the second nozzle side surface 154. The diameter of the opposing body side surface 182 is constant in the front-rear direction.

[0046] The opposing body front end surface 184 corresponds to the tip surface of the opposing body 134. The opposing body front end surface 184 is approximately perpendicular to the opposing body side surface 182. The opposing body front end surface 184 is the surface opposite to the opposing surface 180.

[0047] The opposing body 134 further includes a corner 188. As shown in FIG. 11, the corner 188 connects the opposing body side surface 182 and the opposing body front end surface 184. FIG. 11 is an enlarged cross-sectional view of the corner 188, and the corner 188 is exaggerated. The corner 188 goes around the center axis CX (see FIG. 10). That is, the corner 188 is disposed around the entire circumference of the periphery of the front end of the opposing body side surface 182. The corner 188 constitutes a corner of the front end (tip) of the opposing body 134. The radius of curvature of the corner 188 is, for example, 0.3 mm or less. The corner 188 is a sharp corner. The corner 188 has a curved shape. In a modified example, the corner 188 does not need to have a curved shape. The corner 188 is connected to the opposing body side surface 182 at a side surface connection point 190, and is connected to the opposing body front end surface 184 at a front end connection point 192. In the vicinity of the corner 188, a virtual side surface 194 extending from the opposing body side surface 182 and a virtual front end surface 196 extending from the opposing body front end surface 184 intersect at a first point 198 at a substantially right angle. The distance L2 between the first point 198 and the side surface connection point 190 is, for example, 0.3 mm or less. The distance L3 between the first point 198 and the front end connection point 192 is, for example, 0.3 mm or less. The distance L3 is substantially the same as the distance L2. In a modified example, the distance L3 may be different from the distance L2.

[0048] As shown in FIG. 10, the connecting body 136 connects the front end surface 132a of the liquid nozzle body 132 and the opposing surface 180 of the opposing body 134. The liquid nozzle body 132, the press-fitted body 176 of the opposing body 134, and the connecting body 136 are integrally formed. As shown in FIG. 12, the connecting body 136 includes a first connecting body 200 and a second connecting body 202. The first connecting body 200 and the second connecting body 202 are arranged around the central axis CX. The first connecting body 200 and the second connecting body 202 are arranged apart from each other in the circumferential direction of the central axis CX. For this reason, a first opening 204 is defined between one end of the first connecting body 200 and one end of the second connecting body 202, and a second opening 206 is defined between the other end of the first connecting body 200 and the other end of the second connecting body 202, with respect to the circumferential direction of the central axis CX. With respect to the circumferential direction of the central axis CX, when the position of the first connecting body 200 is set to 0 degrees, the second connecting body 202 is disposed at a position of 180 degrees. The inner surface 200a of the first connecting body 200 faces the inner surface 202a of the second connecting body 202. The outer surface 200b of the first connecting body 200 is connected to the opposing body side surface 182 of the opposing body 134 and the second nozzle side surface 154 of the liquid nozzle body 132 (see FIG. 10). The outer surface 200b is the surface opposite to the inner surface 200a. The distance between the outer surface 200b and the central axis CX is approximately the same as the diameter of the front end of the second nozzle side surface 154 and the diameter of the opposing body side surface 182. The outer surface 202b of the second connecting body 202 is connected to the opposing body side surface 182 of the opposing body 134 and the second nozzle side surface 154 of the liquid nozzle body 132. The outer surface 202b is the surface opposite to the inner surface 202a. The distance between the outer surface 202b and the central axis CX is approximately the same as the diameter of the front end of the second nozzle side surface 154 and the diameter of the opposing body side surface 182, respectively.

[0049] In the circumferential direction of the central axis CX, the length L4 of the outer surface 200b of the first connecting body 200 is 25% or less of the circumferential length of the opposing body side surface 182, and in this embodiment, is 15% or less of the circumferential length of the opposing body side surface 182. In addition, in the circumferential direction of the central axis CX, the length L5 of the outer surface 202b of the second connecting body 202 is 25% or less of the circumferential length of the opposing body side surface 182, and in this embodiment, is 15% or less of the circumferential length of the opposing body side surface 182. That is, in the circumferential direction of the central axis CX, the total length of the length L4 and the length L5 is 50% or less of the circumferential length of the opposing body side surface 182, and in this embodiment, is 30% or less of the circumferential length of the opposing body side surface 182. In addition, in the circumferential direction of the central axis CX, the length L4 is approximately the same as the length L5. In the circumferential direction of the central axis CX, the length L4 is approximately the same as the length of the inner surface 200a of the first connecting body 200. The length L5 is approximately the same as the length of the inner surface 202a of the second connecting body 202 in the circumferential direction of the central axis CX.

[0050] Next, a manufacturing method of the liquid nozzle 122 will be described. The manufacturing method includes a press-fitting step and an opening forming step. The press-fitting step and the opening forming step are carried out in this order. As shown in FIG. 13, two members, a base body 210 and a press-fitting body 178, are prepared as starting members. The base body 210 has a liquid passage 158, which penetrates the base body 210 in the front-rear direction. Although not shown, an insertion portion 140 is formed near the rear end of the base body 210.

[0051] In the press-fitting step, the press-fit body 178 is press-fitted into the outlet passage 168 of the liquid passage 158 from the front side of the base body 210 in the direction of the arrow shown in Fig. 13. As shown in Fig. 14, the press-fit body 178 is press-fitted into the outlet passage 168 until the position of the front end of the press-fit body 178 is substantially the same as the position of the front end of the base body 210. As a result, the outlet passage 168 is blocked by the press-fit body 178 near the front end.

[0052] In the opening forming step, the first cutting blade 220 is disposed on the upper side relative to the base body 210, and the second cutting blade 222 is disposed on the lower side relative to the base body 210. When the position of the first cutting blade 220 is set to 0 degrees in the circumferential direction of the central axis CX, the second cutting blade 222 is disposed at a position of 180 degrees. Next, the first cutting blade 220 and the second cutting blade 222 are disposed between the press-fit body 178 and the throttle passage 164 in the front-rear direction. Next, the first cutting blade 220 is moved downward (in the direction of the downward arrow shown in FIG. 14) from the side surface 212 of the base body 210 toward the central axis CX to a predetermined position, and the second cutting blade 222 is moved upward (in the direction of the upward arrow shown in FIG. 14) from the side surface 212 of the base body 210 toward the central axis CX to a predetermined position. The first cutting blade 220 cuts the base body 210, thereby forming a first opening 204 (see FIG. 12) in the base body 210. The first opening 204 penetrates the base body 210 from the side surface 212 to the inner surface 214 of the base body 210. In addition, the second cutting blade 222 cuts the base body 210, thereby forming a second opening 206 (see FIG. 12 ) in the base body 210. The second opening 206 penetrates the base body 210 from the side surface 212 to the inner surface 214 of the base body 210. When the position of the first opening 204 is set to 0 degrees in the circumferential direction of the central axis CX, the second opening 206 is disposed at a position of 180 degrees.

[0053] As shown in Figure 10, after the opening formation process has been performed, the base body 210 comprises a liquid nozzle body 132 located rearward of the first opening 204 and the second opening 206, a press-fit body 176 of the opposing body 134 located forward of the first opening 204 and the second opening 206, and a connecting body 136 arranged between the liquid nozzle body 132 and the press-fit body 176.

[0054] Next, the behavior of the liquid discharged from the liquid nozzle 122 being atomized will be described. As shown in FIG. 7, when the fan 44 (see FIG. 4) is rotated by the rotation of the electric motor 46 (see FIG. 4), air flows into the discharge pipe 10. After flowing into the discharge pipe 10 to the tip pipe 66, the air flows into the inside of the tubular member 120 as indicated by the arrow F1 in FIG. 7, and flows toward the front end (tip) of the liquid nozzle 122 along the nozzle side surface 150 of the liquid nozzle main body 132. In addition, since the first nozzle side surface 152 of the liquid nozzle main body 132 is surrounded by the tubular member 120 and the diameter of the first nozzle side surface 152 becomes smaller from the rear end to the front end of the nozzle part 142, the air can more easily flow into the inside of the tubular member 120, and the space through which the air flows (the space around the first nozzle side surface 152) becomes narrower, thereby increasing the flow rate of the air. The air passes through the first nozzle side surface 152, the second nozzle side surface 154, and the opposing body side surface 182 of the opposing body 134 in this order, and flows inside the tubular member 120 from the rear end to the front end of the tubular member 120.

[0055] Here, as shown in FIG. 10, in a comparative example in which the distance L1 between the opposing surface 180 and the front end surface 132a is greater than 600% of the diameter D1 of the throttle passage 164, a part of the air may flow into the space 174 after passing through the second nozzle side surface 154. This reduces the flow rate of the air flowing along the opposing body side surface 182. On the other hand, in this embodiment, the distance L1 is less than 600% of the diameter D1, so that the air is prevented from flowing into the space 174 after passing through the second nozzle side surface 154. This reduces the flow rate of the air flowing along the opposing body side surface 182. In addition, as the air passes through the second nozzle side surface 154 and the opposing body side surface 182, the air in the space 174 is sucked out of the space 174 through the first opening 204 and the second opening 206.

[0056] Furthermore, as the air flows around the liquid nozzle 122, a pressure difference occurs between the area near the opposing body side surface 182 and the front area of ​​the opposing body front end surface 184, and as a result, an air flow (vortex flow) SW1 is generated in the front area of ​​the opposing body front end surface 184. The air flow SW1 first flows toward the opposing body front end surface 184 along the central axis CX. Next, the air flow SW1 turns in a direction away from the central axis CX and flows over the opposing body front end surface 184 toward the corner 188. Finally, the air flow SW1 merges with the air flow flowing along the opposing body side surface 182 near the corner 188.

[0057] As the air in the space 174 is sucked out of the space 174, the liquid passes through the supply line 90 (see FIG. 6), the inlet passage 160, the first transfer passage 162, and the throttle passage 164 in this order, and is then discharged from the discharge port 170. The discharged liquid passes through the second transfer passage 166 and the outlet passage 168 in this order, and is discharged into the space 174 toward the opposing surface 180 (press-fit body 178) of the opposing body 134. After hitting the opposing surface 180 (press-fit body 178), the liquid moves on the opposing surface 180 toward the opposing body side surface 182, radially outward of the opposing surface 180. The liquid hits the opposing surface 180, and the flow rate of the liquid decreases. When the liquid moves to the connection point between the opposing surface 180 and the opposing body side surface 182, it moves onto the opposing body side surface 182.

[0058] Here, in a comparative example in which the distance L1 between the opposing surface 180 and the front end surface 132a is smaller than 200% of the diameter D1 of the throttle passage 164, the air in the space 174 is suppressed from being sucked out of the space 174 from the first opening 204 and the second opening 206. As a result, liquid may accumulate between the opposing surface 180 and the front end surface 132a. On the other hand, in this embodiment, the distance L1 is 200% or more of the diameter D1, so the air in the space 174 is sucked out of the space 174 from the first opening 204 and the second opening 206. As a result, the liquid is suppressed from accumulating between the opposing surface 180 and the front end surface 132a. As a result, the liquid can move from the opposing surface 180 onto the opposing body side surface 182.

[0059] Next, the liquid moves on the opposing body side surface 182 toward the corner 188 (see FIG. 10 ) due to the air flow flowing along the opposing body side surface 182. While the liquid moves on the opposing body side surface 182, it spreads around the entire circumference of the opposing body side surface 182.

[0060] Because corner 188 is a sharp corner, the liquid that has moved to corner 188 is unlikely to form a puddle on corner 188. Therefore, the liquid moves away from corner 188 by the air flow flowing along opposing body side surface 182 and air flow SW1 without forming a puddle. This causes the liquid to be atomized. The liquid is atomized to a diameter of, for example, 50 micrometers or less.

[0061] The work machine 2 of this embodiment uses an electric motor 46. The air volume of the fan 44 of an electric motor-driven (electrically-driven) work machine 2 is lower than the air volume of the fan 44 of an engine-driven work machine. Even in such a configuration, the liquid can be atomized by using the liquid nozzle 122 of this embodiment.

[0062] 7, the atomized liquid flows inside the tip tube 66 together with the air flowing inside the tubular member 120 as indicated by the arrow F1. Thereafter, the liquid and air flowing inside the tubular member 120 merge with the air flowing outside the tubular member 120 as indicated by the arrow F2, and are discharged (sprayed) from the diffusion cover 70 to the outside of the second tip tube 68.

[0063] (effect) The working machine 2 of this embodiment is a mist blower. The working machine 2 includes a liquid tank 24 for storing liquid, a fan 44, a discharge pipe 10 through which air sent out by the fan 44 flows, a liquid nozzle body 132 disposed inside the discharge pipe 10 and discharging the liquid stored in the liquid tank 24 into the discharge pipe 10, and an opposing body 134 separated from the liquid nozzle body 132. The liquid nozzle body 132 includes a throttle passage 164 (an example of a throttle portion) having a minimum diameter D1, a liquid passage 158 through which the liquid passes, and a nozzle side surface 150 through which the air sent out by the fan 44 flows. The liquid is discharged from a discharge port 170 of the throttle passage 164. The opposing body 134 includes an opposing surface 180 disposed opposite the discharge port 170, and an opposing body side surface 182 connected to the opposing surface 180 through which the air sent out by the fan 44 flows.

[0064] According to the above configuration, the liquid discharged from the discharge port 170 hits the opposing surface 180 of the opposing body 134, and moves on the opposing surface 180 to the opposing body side surface 182. The liquid is then separated from the opposing body 134 by the air sent out by the fan 44. This allows the liquid to be atomized.

[0065] The liquid nozzle 122 of this embodiment discharges liquid stored in the liquid tank 24 into the discharge pipe 10 through which air flows. The liquid nozzle 122 is a liquid passage 158 (an example of a through hole) extending in the front-rear direction (an example of a first direction), and includes a base body 210 having the liquid passage 158 through which the liquid passes, and a press-fit body 178 that can be press-fitted into the base body 210. The liquid passage 158 includes a throttle passage 164 (an example of a throttle portion) having a smallest diameter D1 in the liquid passage 158, an inlet passage 160 (an example of a first hole portion) having a diameter larger than the diameter D1 of the throttle passage 164, and an outlet passage 168 (an example of a second hole portion) that is disposed on the opposite side of the throttle passage 164 from the inlet passage 160 and has a diameter larger than the diameter D1 of the throttle passage 164. The manufacturing method includes a pressing process in which the press-in body 178 is pressed into the outlet passage 168 until the press-in body 178 is at a position a predetermined distance away from the throttling passage 164, and an opening forming process in which, after the pressing process, the base body 210 is cut in a direction (an example of a second direction) perpendicular to the front-to-rear direction at a position between the throttling passage 164 and the press-in body 178 to form openings 204, 206 that penetrate the base body 210 from a side surface 212 to an inner surface 214 of the base body 210.

[0066] In the liquid nozzle 122 manufactured by the above manufacturing method, the liquid discharged from the throttle passage 164 hits the press-in body 178 and moves over the press-in body 178 toward the openings 204, 206. The liquid then exits the liquid nozzle 122 from the openings 204, 206. The liquid is moved away from the liquid nozzle 122 by the air flowing around the liquid nozzle 122. This allows the liquid to be atomized.

[0067] In addition, the second nozzle side surface 154 of the nozzle side surface 150 has a circular shape. The opposing body side surface 182 has a circular shape. The diameter of the opposing body side surface 182 is 60% or more and 100% or less of the diameter of the second nozzle side surface 154.

[0068] According to the above configuration, even if the air flows along the opposing body side surface 182 of the opposing body 134 after flowing along the second nozzle side surface 154 of the liquid nozzle body 132, it is possible to suppress a decrease in the flow rate of the air. This makes it possible to further atomize the liquid.

[0069] Moreover, the work machine 2 further includes a connecting body 136 that connects the liquid nozzle body 132 and the opposing body 134 together.

[0070] According to the above configuration, it is possible to fix the position of the opposing body 134 relative to the liquid nozzle body 132. This makes it possible to stably atomize the liquid.

[0071] Furthermore, with respect to the circumferential direction of the opposing body side surface 182, the total length of the lengths L4 and L5 (the length of the outer surface of the connecting body 136) is 50% of the length of the opposing body side surface 182 or less.

[0072] According to the above configuration, the liquid can be moved over the entire circumference of the opposing body side surface 182. This makes it possible to further atomize the liquid.

[0073] Furthermore, the distance L1 between the opposing surface 180 and the liquid nozzle body 132 is 200% or more and 600% or less of the diameter D1 of the throttle passage 164.

[0074] When the distance L1 between the opposing surface 180 and the liquid nozzle body 132 is smaller than 200% of the diameter D1 of the throttle passage 164, the liquid discharged from the discharge port 170 accumulates between the liquid nozzle body 132 and the opposing body 134, and atomization of the liquid is suppressed. On the other hand, when the distance L1 between the opposing surface 180 and the liquid nozzle body 132 is greater than 600% of the diameter D1 of the throttle passage 164, the flow rate of the air flowing along the opposing body side surface 182 of the opposing body 134 decreases compared to a configuration in which the distance L1 between the opposing surface 180 and the liquid nozzle body 132 is 600% or less of the diameter D1 of the throttle passage 164. This suppresses atomization of the liquid. With the above configuration, the liquid can be atomized.

[0075] (Second Example) A second embodiment will be described with reference to FIG. 15. In the second embodiment, only the differences from the first embodiment will be described. In the second embodiment, the liquid nozzle body 132 and the connector 136 are separate bodies. In FIG. 15, the boundary 300 between the liquid nozzle body 132 and the connector 136 is shown by a dashed line. The connector 136 has a protrusion 302 protruding from the rear end face. The liquid nozzle body 132 has a recessed groove 304 recessed from the front end face 132a. In FIG. 15, the protrusion 302 and the recessed groove 304 are hidden and cannot be seen, so the protrusion 302 and the recessed groove 304 are shown by a dashed line. The protrusion 302 fits into the recessed groove 304. This connects the liquid nozzle body 132 and the connector 136.

[0076] (effect) The connecting body 136 is formed integrally with the opposing body 134 and is separate from the liquid nozzle body 132 .

[0077] According to the above configuration, liquid nozzle body 132, opposing body 134 and connecting body 136 can be easily produced.

[0078] (Third Example) A third embodiment will be described with reference to FIG. 16. In the third embodiment, only the differences from the first embodiment will be described. In the third embodiment, the connector 136 has a cylindrical shape. The connector 136 has a plurality of openings 350 (four in this embodiment). The openings 350 penetrate the connector 136 from the inner surface to the outer surface. The four openings 350 are arranged at equal intervals in the circumferential direction of the outer surface of the connector 136. The openings 350 have a substantially cylindrical shape. In the third embodiment, the liquid is discharged from the discharge port 170 of the liquid nozzle body 132, hits the opposing surface 180 of the opposing body 134, and then passes through the openings 350 and moves to the opposing body side surface 182.

[0079] (Fourth Example) The fourth embodiment will be described with reference to FIG. 17. In the fourth embodiment, only the points different from the first embodiment will be described. In the fourth embodiment, the opposing body front end surface 184 of the opposing body 134 includes a first front end surface 400 and a second front end surface 402. The first front end surface 400 has a substantially circular shape. The circle center of the first front end surface 400 is disposed on the central axis CX. The first front end surface 400 is substantially perpendicular to the central axis CX. The second front end surface 402 is disposed on the periphery of the first front end surface 400. The second front end surface 402 goes around the central axis CX. The second front end surface 402 is inclined with respect to the first front end surface 400. The second front end surface 402 is inclined with respect to the opposing body side surface 182. The angle A between the second front end face 402 and the opposing body side face 182 is greater than 1 degree and less than 180 degrees, and in this embodiment, the angle A is greater than 1 degree and less than or equal to 90 degrees.

[0080] (Fifth Example) A fifth embodiment will be described with reference to FIG. 18. In the fifth embodiment, only the differences from the first embodiment will be described. In the fifth embodiment, the corner portion 188 may include a first curved portion 450, a second curved portion 452, and a flat portion 454. The first curved portion 450 is connected to the opposing body side surface 182 at a side surface connection point 190. The second curved portion 452 is connected to the opposing body front end surface 184 at a front end connection point 192. The first curved portion 450 and the second curved portion 452 have a curved shape. The flat portion 454 connects the first curved portion 450 and the second curved portion 452. The flat portion 454 has a flat shape.

[0081] (Modification) The work machine 2 according to one embodiment may be an engine-powered work machine.

[0082] The work machine 2 according to one embodiment may be a work machine equipped with a built-in battery. In this case, the built-in battery is charged by connecting a power cord to an external power source. The work machine 2 may not be equipped with a built-in battery. In this case, the work machine 2 operates using power supplied from an external power source via a power cord.

[0083] The working machine 2 according to one embodiment is not limited to a backpack-type working machine, and may be, for example, a stationary working machine or a handheld working machine.

[0084] In the liquid nozzle 122 according to one embodiment, the corner portion 188 may be disposed on only a portion of the circumferential edge of the opposing body side surface 182 in the circumferential direction.

[0085] In one embodiment of the liquid nozzle 122, the cross section of the counter body side 182 may be polygonal, for example, hexagonal, octagonal, decagonal, or dodecagonal.

[0086] In the liquid nozzle 122 according to one embodiment, the liquid nozzle body 132, the opposing body 134, and the connecting body 136 may be integrally formed.

[0087] The liquid nozzle 122 according to one embodiment may not include the connecting body 136. In this case, the opposing body 134 is fixed to the cylindrical member 120. [Explanation of symbols]

[0088] 2: Work equipment 10: Release tube 24: Liquid tank 44: Fan 56: Control board 66:Tip tube 67: 1st tip tube 68:Second tip tube 90: Supply line 120: Cylinder member 122: Liquid nozzle 132: Liquid nozzle body 132a: Front end surface 134: Opposite body 136: Connector 142: Nozzle section 150: Nozzle side 158:Liquid passage 160: Entrance passage 162: First transition passage 164: Aperture passage 166: 2nd Transition Passage 168:Exit passage 170: Outlet 176: Pressed body 178: Press-in body 180: Opposite surface 182: Side of opposing body 184: Opposite body front end surface 188: Corner 200: First connector 200a: Inner surface 200b: External surface 202: Second connector 202a: Inner surface 202b: External surface 204: First opening 206: Second opening 210: Base body 212: Side 214: Inside 220: 1st cutting blade 222: 2nd cutting blade CX: Central axis D1: Diameter L1, L2, L3: distance L4, L5: Length

Claims

1. a liquid tank for storing a liquid; With fans, a discharge pipe through which the air blown out by the fan flows; a liquid nozzle body disposed inside the discharge pipe and configured to discharge the liquid stored in the liquid tank into the discharge pipe; an opposing body spaced apart from the liquid nozzle body, The liquid nozzle body includes: a liquid passageway having a restriction with a minimum diameter through which the liquid passes; a nozzle side surface through which the air blown out by the fan flows, The liquid is discharged from the discharge port of the throttle portion, The opposing body is an opposing surface disposed opposite the discharge port; a side surface of an opposing body connected to the opposing surface and through which air blown out by the fan flows.

2. the nozzle side has a circular shape with a first diameter; The opposing side has a circular shape with a second diameter, 2. The mist blower according to claim 1, wherein the second diameter is greater than or equal to 60% and less than or equal to 100% of the first diameter.

3. The mist blower according to claim 1 , further comprising a connector connecting the liquid nozzle body and the opposing body.

4. 4. The mist blower according to claim 3, wherein the length of the outer surface of the connecting body in the circumferential direction of the opposing body side surface is 50% or less of the length of the opposing body side surface.

5. 4. The mist blower according to claim 3, wherein the connecting body is formed integrally with the opposing body and is separate from the liquid nozzle body.

6. 6. The mist blower according to claim 1, wherein the distance between the opposing surface and the liquid nozzle body is 200% or more and 600% or less of the diameter of the throttle portion.

7. A method for manufacturing a liquid nozzle that discharges liquid stored in a liquid tank into a discharge pipe through which air flows, comprising: The liquid nozzle is a base body having a through hole extending in a first direction, the through hole through which the liquid passes; a press-fitting body that can be press-fitted into the base body, The through hole is a throttling portion having a minimum diameter within the through hole; a first hole portion having a diameter larger than the diameter of the throttle portion; a second hole portion disposed on the opposite side of the throttling portion from the first hole portion and having a diameter larger than the diameter of the throttling portion, The manufacturing method includes: a press-fitting step of press-fitting the press-fit body into the second hole portion to a position spaced a predetermined distance from the narrowed portion; and an opening forming step of, after the press-fitting step, cutting the base body in a second direction perpendicular to the first direction at a position between the constricted portion and the press-fitted body to form an opening that penetrates the base body from the side surface to the inner surface of the base body.

Images