Method for manufacturing a mist blower and liquid nozzle
Patent Information
- Application Number
- JP2022194762
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2022-12-06
- Publication Date
- 2026-10-30
- Estimated Expiration
- 2042-12-06
Smart Images
Figure 0007943798000001 
Figure 0007943798000002 
Figure 0007943798000003
Abstract
Description
Technical Field
[0001] The technology disclosed in the present specification relates to a mist blower and a method for manufacturing a liquid nozzle.
Background Art
[0002] Patent Document 1 discloses a mist blower. The mist blower is provided with a liquid tank that stores liquid, a fan, a discharge pipe through which air sent by the fan flows, and a liquid nozzle that is arranged inside the discharge pipe and discharges the liquid stored in the liquid tank into the discharge pipe. The liquid nozzle has a discharge port that discharges liquid to the outside of the liquid nozzle.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] In the above mist blower, normally, the liquid discharged from the discharge port moves on the front end surface to the corner of the liquid nozzle, then separates from the liquid nozzle at the corner and is atomized. On the other hand, part of the liquid discharged from the discharge port does not move toward the corner on the front end surface, but separates from the front end surface immediately after discharge and is turned into mist. The particle size of the liquid that separates from the front end surface in the vicinity of the discharge port is larger than the particle size of the liquid atomized at the corner of the liquid nozzle. The present specification provides a technology that can atomize liquid.
Means for Solving the Problems
[0005] This specification discloses a mist blower. The mist blower comprises a liquid tank for storing liquid, a fan, a discharge pipe through which air blown by the fan flows, a liquid nozzle body disposed inside the discharge pipe for 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 has a throttling section having a minimum diameter, a liquid passage through which the liquid passes, and a nozzle side through which air blown by the fan flows. The liquid is discharged from the discharge port of the throttling section. The opposing body has an opposing surface positioned opposite the discharge port, and an opposing body side connected to the opposing surface through which air blown by the fan flows.
[0006] According to the above configuration, the liquid discharged from the outlet strikes the opposing surface of the opposing body and moves along that surface to the side of the opposing body. Then, the liquid is separated from the opposing body by air blown out 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 into a discharge pipe through which air flows. The liquid nozzle comprises a base body having a through-hole extending in a first direction through which liquid passes, and an inlet body that can be pressed into the base body. The through-hole comprises a throttling portion having the smallest diameter within the through-hole, a first hole portion having a diameter larger than the diameter of the throttling portion, and a second hole portion located on the opposite side of the first hole portion from the throttling portion and having a diameter larger than the diameter of the throttling portion. The manufacturing method comprises a press-fitting step of press-fitting the inlet body into the second hole portion to a predetermined distance from the throttling portion, and an opening forming step after the press-fitting step of cutting the base body in a second direction perpendicular to the first direction at a position between the throttling portion and the inlet body to form an opening that penetrates the base body from the side to the inner surface.
[0008] In a liquid nozzle manufactured using the method described above, the liquid released from the throttling section strikes the inlet and moves along the inlet towards the opening. The liquid then exits the liquid nozzle through the opening. The liquid is then separated from the nozzle by the air flowing around it. This allows the liquid to be atomized. [Brief explanation of the drawing]
[0009] [Figure 1] This is a perspective view of the work machine 2 of the first embodiment. [Figure 2] This is an exploded perspective view of the work machine 2 of the first embodiment. [Figure 3] This is a perspective view of the work machine 2 of the first embodiment when the cover portion 28 is open. [Figure 4] This is an exploded perspective view of the fan unit 18 and control unit 20 of the first embodiment. [Figure 5] This is a perspective view of the discharge pipe 10 of the first embodiment. [Figure 6] This is a perspective view of the liquid tank 24, discharge tube 88, and supply line 90 of the first embodiment. [Figure 7] This is a cross-sectional perspective view of the discharge pipe 10, cylindrical member 120, and liquid nozzle 122 of the first embodiment. [Figure 8] This is a perspective view of the liquid nozzle 122 of the first embodiment. [Figure 9] This is a cross-sectional view of the second supply pipe 102 and liquid nozzle 122 of the first embodiment. [Figure 10] This is a cross-sectional view of the vicinity of the front end of the liquid nozzle 122 of the first embodiment. [Figure 11] This is a cross-sectional view of the corner 188 of the liquid nozzle 122 of the first embodiment. [Figure 12] This is a cross-sectional view of the liquid nozzle 122 near the connector 136 of the first embodiment. [Figure 13] This is a cross-sectional view of a liquid nozzle 122 showing a manufacturing method for the liquid nozzle 122 of the first embodiment. [Figure 14] This is a cross-sectional view of a liquid nozzle 122 showing a manufacturing method for the liquid nozzle 122 of the first embodiment. [Figure 15] It is a cross-sectional view near the front end of the liquid nozzle 122 of the second embodiment. [Figure 16] It is a cross-sectional view near the connection body 136 of the liquid nozzle 122 of the third embodiment. [Figure 17] It is a cross-sectional view near the opposing body front end face 184 of the opposing body 134 of the fourth embodiment. [Figure 18] It is a cross-sectional view of the corner portion 188 of the liquid nozzle 122 of the fifth embodiment.
Mode for Carrying Out the Invention
[0010] Representative and non-limiting specific examples of the present invention will be described in detail below with reference to the drawings. This detailed description is merely intended to show those skilled in the art the details for implementing preferred examples of the present invention, and is not intended to limit the scope of the present invention. In addition, the disclosed additional features and inventions may be used separately from or in combination with other features and inventions to provide a further improved mist blower and a method for manufacturing the liquid nozzle used therein.
[0011] Furthermore, the combinations of features and steps disclosed in the following detailed description are not essential for practicing the present invention in its broadest sense, and are described solely for the purpose of explaining representative specific examples of the present invention. Furthermore, the various features of the representative specific examples below, as well as the various features set forth in the claims, may be used in providing additional and useful embodiments of the present invention without being limited to the combinations as described in the specific examples herein or in the order listed.
[0012] All features described in the present specification and / or the claims are intended to be disclosed individually and independently of each other, as limitations to the specific matters stated in the original disclosure at the time of filing and the claims, apart from the configuration of the features described in the embodiments and / or the claims. Furthermore, all descriptions of numerical ranges and groups or sets are made with the intention of disclosing intermediate configurations thereof as limitations to the specific matters stated in the original disclosure at the time of filing and the claims.
[0013] In one or more embodiments, the nozzle side surface may have a circular shape with a first diameter. The opposing body side surface may have a circular shape with a second diameter. The second diameter may be 60% or more and 100% or less of the first diameter.
[0014] According to the above configuration, even if air flows along the nozzle side surface of the liquid nozzle body and then flows along the opposing body side surface of the opposing body, a decrease in the flow velocity of the air can be suppressed. Thereby, the liquid can be further atomized into finer particles.
[0015] In one or more embodiments, the mist blower may further include a connecting body that connects the liquid nozzle body and the opposing body.
[0016] According to the above configuration, the position of the opposing body relative to the liquid nozzle body can be fixed. Thereby, the liquid can be stably atomized into finer particles.
[0017] In one or more embodiments, with respect to the circumferential direction of the opposing body side surface, the length of the outer surface of the connecting body may be 50% or less of the length of the opposing body side surface.
[0018] According to the above configuration, the liquid can be moved over the entire circumference of the opposing body side surface. Thereby, the liquid can be further atomized into finer particles.
[0019] In one or more embodiments, the connector may be integrally formed with the opposing body and separate from the liquid nozzle body.
[0020] According to the above 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 200% or more and 600% or less of the diameter of the throttling portion.
[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 section, the liquid discharged from the outlet accumulates between the liquid nozzle body and the opposing body, suppressing the atomization of the liquid. 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 section, the flow velocity of the air flowing along the side of the opposing body decreases compared to a configuration where the distance between the opposing surface and the liquid nozzle body is 600% or less of the diameter of the throttling section. This suppresses the atomization of the liquid. According to the above configuration, the liquid can be atomized.
[0023] (First embodiment) As shown in Figure 1, the implement 2 is a backpack-type implement. The implement 2 is configured to discharge (spray) liquid. The implement 2 is, for example, a mist blower. The implement 2 comprises a main 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 unit 4. The harness unit 8 is attached to the main unit 4 directly and / or indirectly. The discharge pipe 10 is attached to the lower right side of the main unit 4. The handle unit 12 is attached to the discharge pipe 10. The user, wearing the harness unit 8 and carrying the implement 2 on their back, grasps the handle unit 12 and manipulates the discharge pipe 10 to spray liquid from the discharge pipe 10. In the following, the vertical, horizontal, and front-to-back directions of the implement 2 correspond to the vertical, horizontal, and front-to-back directions as seen from the perspective of the user carrying the implement 2 on their back.
[0024] As shown in Figure 2, the main unit 4 comprises a main housing 16, a fan unit 18, a control unit 20, and a liquid tank 24. As shown in Figure 3, the main housing 16 comprises 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 pivot axis extending in the left-right direction.
[0025] As shown in Figure 2, the main body 26 has two internal spaces: a first internal space 32 and a second internal space 34. The fan unit 18 and the control unit 20 are located in the first internal space 32. As shown in Figure 3, a cover 40 is attached near the lower left side of the main body 26, and the first internal space 32 communicates with the outside of the work machine 2 through the air intake 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 Figure 2, multiple (two in this embodiment) battery packs BP are located in the second internal space 34.
[0026] As shown in Figure 4, the fan unit 18 comprises a fan 44, an electric motor 46, a motor housing 48, a cover member 50, a cone 52, and a cylindrical member 54. The fan 44 is, for example, an axial fan. The shaft 46a of the electric motor 46 is connected to the fan 44. The electric motor 46 is powered by the battery pack BP (see Figure 2). The electric motor 46 rotates the fan 44. The electric motor 46 is, for example, a brushless motor. The motor housing 48 houses the electric motor 46. Multiple rectifier 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 cylindrical member 54 has a substantially cylindrical shape. The cylindrical member 54 houses the fan 44, the electric motor 46, the motor housing 48, and the cover member 50 inside. The inner surface of the cylindrical member 54 is connected to a plurality of rectifying fins 55. The cylindrical member 54 is supported by the main housing 16 (see Figure 2).
[0027] The control unit 20 is mounted on the upper part of the cylindrical member 54. The control unit 20 includes a control board 56 which has a plurality of switching elements (not shown) and a microcontroller. 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 closes 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] A discharge pipe 10, as shown in Figure 1, is attached to the cylindrical member 54. The discharge pipe 10 is located on the right side of the main unit 4. The discharge pipe 10 comprises a curved pipe 60 attached to the cylindrical member 54 (see Figure 2), a bellows pipe 62 attached to the curved pipe 60, an intermediate pipe 64 attached to the bellows pipe 62, and a tip pipe 66 attached to the intermediate pipe 64. The bellows pipe 62 is configured to allow adjustment of the orientation of the intermediate pipe 64 and the tip pipe 66. A dome-shaped diffusion cover 70 is attached to the tip of the tip pipe 66.
[0029] As shown in Figure 1, a handle unit 12 is attached to the intermediate pipe 64. The handle unit 12 comprises a gripping part 72, a trigger 74 attached to the gripping part 72, a head part 76 connected to the gripping part 72, a main power button 78 located on the rear surface of the head part 76, and an adjustment button 80 located on the top surface of the head part 76. The user can adjust the orientation of the intermediate pipe 64 and the tip pipe 66 by gripping the gripping part 72 and moving the handle unit 12. The main power button 78 accepts user input to switch the work machine 2 on and off. The adjustment button 80 accepts user input to adjust the rotation speed of the electric motor 46 (see Figure 4).
[0030] When the work implement 2 is in the ON state, if the user presses the trigger 74, the control board 56 shown in Figure 4 rotates the shaft 46a of the electric motor 46 using power from the battery pack BP (see Figure 2). This causes the fan 44 to rotate, and air flows from outside the work implement 2 into the first internal space 32 (see Figure 2) through multiple intake ports 40a (see Figure 3). The incoming air flows into the inside of the cylindrical member 54. As shown in Figure 4, the incoming air is sent out by the fan 44, straightened by multiple straightening fins 55, and then flows along the cone 52. Since at least a portion 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. Subsequently, the air flows through the discharge pipe 10 shown in Figure 5, passes through the diffusion cover 70, and is released to the outside of the work machine 2. The air is guided radially outward from the tip pipe 66 by the diffusion fins 70a of the diffusion cover 70 and released over a wide area.
[0031] As shown in Figure 3, the liquid tank 24 is mounted on the top of the main housing 16. The liquid tank 24 stores liquid. The liquid is, for example, a chemical solution or water.
[0032] As shown in Figure 6, a discharge section 84 and a supply section 86 are formed at the lower end of the liquid tank 24. A discharge tube 88 is connected to the discharge section 84. By opening the discharge cock 89 on the discharge tube 88, the liquid stored in the liquid tank 24 is discharged to the outside of the liquid tank 24 via the discharge section 84 and the 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, a solenoid valve 96, a supply tube 98, a second supply cock 100 (see Figure 5), a second supply pipe 102 (see Figure 5), and a third supply cock 104 (see Figure 5). When the work machine 2 is operating, the first supply cock 94, the second supply cock 100, and the third supply cock 104 are open. As shown in Figure 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 solenoid valve 96 are located on the first supply pipe 92. The first supply cock 94 is operated by the user. The first supply cock 94 opens and closes the first supply pipe 92. Although not shown, the solenoid valve 96 is located inside the main housing 16 (see Figure 2). The solenoid valve 96 is opened and closed by control from the control board 56 (see Figure 4).
[0034] The supply tube 98 is connected to the first supply pipe 92. As shown in Figure 5, the supply tube 98 extends along the discharge pipe 10. The second supply cock 100 is located on the supply tube 98. The supply tube 98 is fixed to the discharge pipe 10 at the location where the second supply cock 100 is located. The second supply cock 100 is operated by the user. The second supply cock 100 opens and closes the supply tube 98.
[0035] As shown in Figure 7, the second supply pipe 102 is connected to the supply tube 98. The tip pipe 66 comprises a first tip pipe 67 and a second tip pipe 68 attached to the front end of the first tip pipe 67, and the second supply pipe 102 is integrally formed with the first tip pipe 67. The second supply pipe 102 comprises an outer portion 108, a first inner portion 110, and a second inner portion 112. The outer portion 108 is located outside the tip pipe 66. The third supply cock 104 is located on the outer portion 108. The third supply cock 104 is operated by the 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 located inside the tip pipe 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 pipe 68. When the first supply cock 94 (see Figure 6), the solenoid valve 96 (see Figure 6), the second supply cock 100 (see Figure 5), and the third supply cock 104 are open, the liquid in the liquid tank 24 (see Figure 5) can flow through the first supply pipe 92 (see Figure 5), the supply tube 98, and the second supply pipe 102.
[0036] The following description will use the case where the longitudinal direction of the tip tube 66 is aligned with the front-to-back direction as an example. The work machine 2 further comprises a cylindrical member 120 and a liquid nozzle 122. The cylindrical member 120 is located inside the second tip tube 68. The cylindrical member 120 has a substantially cylindrical shape with its longitudinal direction in the front-to-back direction. The cylindrical member 120 comprises a front cylindrical portion 124 and a rear cylindrical portion 126. The front cylindrical portion 124 is connected to the second tip tube 68 via a plurality of fins 128. The front cylindrical portion 124, the plurality of fins 128, and the second tip tube 68 are integrally formed. The rear cylindrical portion 126 is located behind the front cylindrical portion 124. The rear cylindrical portion 126 is connected to the fins 128 and the second tip tube 68 by screws. The inner diameter of the cylindrical member 120 decreases towards the front and then increases. A portion of the air flowing inside the tip tube 66 flows inside the cylindrical member 120, as indicated by arrow F1 in Figure 7, while the remaining air flowing inside the tip tube 66 flows outside the cylindrical member 120, as indicated by arrow F2 in Figure 7.
[0037] The liquid nozzle 122 is, for example, an ultra-low volume nozzle. The liquid nozzle 122 is located inside the second tip tube 68. The front end of the liquid nozzle 122 is located closest to the discharge opening 68a of the second tip tube 68 (at the forefront), and the rear end of the liquid nozzle 122 is located furthest from the discharge opening 68a of the second tip tube 68 (at the rear). 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 metallic material, for example, brass. In a modified example, the liquid nozzle 122 may be made of a resin material.
[0038] As shown in Figure 8, the liquid nozzle 122 comprises a liquid nozzle body 132, an opposing body 134, and a connecting body 136. The liquid nozzle body 132 comprises an insertion portion 140 and a nozzle portion 142. The insertion portion 140 has a substantially cylindrical shape. As shown in Figure 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. Also, a male threaded portion 146 is formed on the outer surface of the insertion portion 140. A female threaded portion 148 is formed on the inner surface of 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 threaded portion 146 of the insertion portion 140 into the female threaded portion 148 of the second inner portion 112, the insertion portion 140 is connected to 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 seals the space 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 portion of the outer shape of the nozzle portion 142. As shown in Figure 7, some of the air flowing inside the tip tube 66 flows along the nozzle side surface 150 toward the front end of the liquid nozzle 122, as indicated by 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 decreases from the rear end toward 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 located in front 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 the first nozzle side surface 152 and the second nozzle side surface 154 are surrounded by the rear cylindrical portion 126.
[0040] As shown in Figure 9, the liquid nozzle 122 further comprises a liquid passage 158. The liquid passage 158 is located 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 located 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 is substantially circular.
[0041] The liquid passage 158 comprises an inlet passage 160, a first transition passage 162, a throttling 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. The inlet passage 160 is positioned across the insertion portion 140 and the nozzle portion 142.
[0042] As shown in Figure 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 towards the front. The throttling passage 164 is connected to the front end of the first transition passage 162. The diameter D1 of the throttling passage 164 is smaller than the diameter of the inlet passage 160. The diameter D1 of the throttling passage 164 is, for example, 0.5 mm. The front end of the throttling passage 164 corresponds to the outlet 170. The outlet 170 is located on the central axis CX. The second transition passage 166 is connected to the front end of the throttling passage 164. The diameter of the second transition passage 166 gradually increases towards the front. 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 132a corresponds to the tip surface of the liquid nozzle body 132.
[0043] The opposing body 134 is positioned in front of the front end surface 132a of the liquid nozzle body 132. The opposing body 134 is separated from the front end surface 132a of the liquid nozzle body 132. As a result, a space 174 is defined between the opposing body 134 and the front end surface 132a of the liquid nozzle body 132. The opposing body 134 as a whole has a substantially disc shape. The opposing body 134 comprises a press-fitted body 176 having a substantially cylindrical shape and a press-fitted body 178 having a substantially disc 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 substantially the same as the diameter of the outlet passage 168.
[0044] The opposing body 134 comprises an opposing surface 180, an opposing side surface 182, and an opposing front end surface 184. The opposing surface 180 faces the discharge port 170 of the liquid nozzle body 132. The opposing surface 180 is separated 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 throttling passage 164, and in this embodiment, it 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 substantially perpendicular to the opposing surface 180. The cross-section of the opposing body side surface 182 is substantially circular. The diameter of the opposing body side surface 182 is substantially 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 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 front end surface 184 of the opposing body corresponds to the tip surface of the opposing body 134. The front end surface 184 of the opposing body is approximately perpendicular to the side surface 182 of the opposing body. The front end surface 184 of the opposing body is the surface opposite to the opposing surface 180.
[0047] The opposing body 134 further includes a corner portion 188. As shown in Figure 11, the corner portion 188 connects the opposing body side surface 182 and the opposing body front end surface 184. Figure 11 is an enlarged cross-sectional view of the corner portion 188, exaggerating its appearance. The corner portion 188 encircles the central axis CX (see Figure 10). That is, the corner portion 188 is arranged around the entire circumference of the front edge of the opposing body side surface 182. The corner portion 188 constitutes the corner of the front end (tip) of the opposing body 134. The radius of curvature of the corner portion 188 is, for example, 0.3 mm or less. The corner portion 188 is a pointed corner. The corner portion 188 has a curved shape. In modified examples, the corner portion 188 does not have to have a curved shape. The corner portion 188 is connected to the side surface 182 of the opposing body at the side connection point 190, and to the front end surface 184 of the opposing body at the front end connection point 192. Near the corner portion 188, a virtual side surface 194, which is an extension of the side surface 182 of the opposing body, and a virtual front end surface 196, which is an extension of the front end surface 184 of the opposing body, intersect at approximately a right angle at the first point 198. The distance L2 between the first point 198 and the side 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. Distance L3 is approximately the same as distance L2. In modified examples, distance L3 may be different from distance L2.
[0048] As shown in Figure 10, the connector 136 connects the front end surface 132a of the liquid nozzle body 132 to 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 connector 136 are integrally formed. As shown in Figure 12, the connector 136 comprises a first connector 200 and a second connector 202. The first connector 200 and the second connector 202 are arranged around the central axis CX. The first connector 200 and the second connector 202 are spaced apart from each other in the circumferential direction of the central axis CX. Therefore, with respect to the circumferential direction of the central axis CX, a first opening 204 is defined between one end of the first connector 200 and one end of the second connector 202, and a second opening 206 is defined between the other end of the first connector 200 and the other end of the second connector 202. With respect to the circumferential direction of the central axis CX, when the position of the first connector 200 is set to 0 degrees, the second connector 202 is positioned at 180 degrees. The inner surface 200a of the first connector 200 faces the inner surface 202a of the second connector 202. The outer surface 200b of the first connector 200 is connected to the opposing body side surface 182 of the opposing body 134 and to the second nozzle side surface 154 of the liquid nozzle body 132 (see Figure 10). Note that 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, respectively. The outer surface 202b of the second connector 202 is connected to the opposing body side surface 182 of the opposing body 134 and to the second nozzle side surface 154 of the liquid nozzle body 132. Note that 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] With respect to 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, it is 15% or less of the circumferential length of the opposing body side surface 182. Also, with respect to 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, it is 15% or less of the circumferential length of the opposing body side surface 182. That is, with respect to the circumferential direction of the central axis CX, the sum of lengths L4 and L5 is 50% or less of the circumferential length of the opposing body side surface 182, and in this embodiment, it is 30% or less of the circumferential length of the opposing body side surface 182. Also, with respect to the circumferential direction of the central axis CX, length L4 is approximately the same as length L5. With respect to the circumferential direction of the central axis CX, length L4 is approximately the same as the length of the inner surface 200a of the first connecting body 200. With respect to the circumferential direction of the central axis CX, the length L5 is approximately the same as the length of the inner surface 202a of the second connecting body 202.
[0050] Next, the manufacturing method for the liquid nozzle 122 will be described. The manufacturing method comprises a press-fitting step and an opening formation step. The press-fitting step and the opening formation step are performed in order. As shown in Figure 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 process, the press-fitting body 178 is pressed 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 Figure 13. As shown in Figure 14, the press-fitting body 178 is pressed into the outlet passage 168 until the position of the front end of the press-fitting body 178 is approximately 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-fitting body 178 near its front end.
[0052] In the opening formation process, the first cutting blade 220 is positioned above the base body 210, and the second cutting blade 222 is positioned below the base body 210. With respect to the circumferential direction of the central axis CX, when the position of the first cutting blade 220 is set to 0 degrees, the second cutting blade 222 is positioned at 180 degrees. Next, the first cutting blade 220 and the second cutting blade 222 are positioned between the press-fit body 178 and the throttling 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 Figure 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 Figure 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, forming the first opening 204 (see Figure 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. Furthermore, the second cutting blade 222 cuts the base body 210, forming a second opening 206 (see Figure 12). The second opening 206 penetrates the base body 210 from the side surface 212 to the inner surface 214. With respect to the circumferential direction of the central axis CX, when the position of the first opening 204 is set to 0 degrees, the second opening 206 is positioned at 180 degrees.
[0053] As shown in Figure 10, the base body 210 after the opening formation process has been performed comprises a liquid nozzle body 132 located behind the first opening 204 and the second opening 206, a press-fit body 176 of the opposing body 134 located in front of the first opening 204 and the second opening 206, and a connecting body 136 positioned between the liquid nozzle body 132 and the press-fit body 176.
[0054] Next, we will explain the behavior of atomization of the liquid discharged from the liquid nozzle 122. As shown in Figure 7, when the fan 44 (see Figure 4) rotates due to the rotation of the electric motor 46 (see Figure 4), air flows into the discharge pipe 10. After the air flows through the discharge pipe 10 to the tip pipe 66, it flows into the cylindrical member 120 as indicated by arrow F1 in Figure 7, and flows along the nozzle side surface 150 of the liquid nozzle body 132 toward the front end (tip) of the liquid nozzle 122. In addition, the first nozzle side surface 152 of the liquid nozzle body 132 is surrounded by the cylindrical member 120, and the diameter of the first nozzle side surface 152 decreases from the rear end to the front end of the nozzle section 142. As a result, air flows more easily into the cylindrical member 120, and the airflow velocity is increased as the space through which the air flows (the space around the first nozzle side surface 152) narrows. The air passes sequentially 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, and flows inside the cylindrical member 120 from the rear end to the front end.
[0055] Here, as shown in Figure 10, in the comparative example where the distance L1 between the opposing surface 180 and the front end surface 132a is greater than 600% of the diameter D1 of the throttling passage 164, some of the air may flow into the space 174 after passing through the second nozzle side surface 154. This reduces the flow velocity of the air flowing along the opposing body side surface 182. On the other hand, in this embodiment, since the distance L1 is 600% or less of the diameter D1, the flow of air into the space 174 after passing through the second nozzle side surface 154 is suppressed. This suppresses a decrease in the flow velocity 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 drawn out of the space 174 through the first opening 204 and the second opening 206.
[0056] Furthermore, as air flows around the liquid nozzle 122, a pressure difference is generated between the region near the side surface 182 of the opposing body and the front region of the front end surface 184 of the opposing body. As a result, an airflow (vortex flow) SW1 is generated in the front region of the front end surface 184 of the opposing body. The airflow SW1 first flows along the central axis CX toward the front end surface 184 of the opposing body. Next, the airflow SW1 curves away from the central axis CX and flows along the front end surface 184 of the opposing body toward the corner 188. Finally, the airflow SW1 merges with the airflow flowing along the side surface 182 of the opposing body near the corner 188.
[0057] As the air in space 174 is drawn out of space 174, the liquid passes through the supply line 90 (see Figure 6), the inlet passage 160, the first transition passage 162, and the throttling passage 164 in sequence before being discharged from the outlet 170. The discharged liquid then passes through the second transition passage 166 and the outlet passage 168 in sequence and is discharged into space 174 toward the opposing surface 180 (pressure-in body 178) of the opposing body 134. After hitting the opposing surface 180 (pressure-in body 178), the liquid moves radially outward along the opposing surface 180 toward the side surface 182 of the opposing body. The liquid's flow velocity decreases as it hits the opposing surface 180. When the liquid reaches the connection point between the opposing surface 180 and the side surface 182 of the opposing body, it moves onto the side surface 182 of the opposing body.
[0058] In the comparative example, where the distance L1 between the opposing surface 180 and the front end surface 132a is less than 200% of the diameter D1 of the throttling passage 164, the air in the space 174 is suppressed from being drawn out of the space 174 through 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, since the distance L1 is 200% or more of the diameter D1, the air in the space 174 is drawn out of the space 174 through the first opening 204 and the second opening 206. As a result, the accumulation of liquid between the opposing surface 180 and the front end surface 132a is suppressed. Consequently, the liquid can move from the opposing surface 180 onto the opposing body side surface 182.
[0059] Next, the liquid moves along the side surface 182 of the opposing body toward the corner 188 (see Figure 10) due to the airflow along the side surface 182 of the opposing body. As the liquid moves along the side surface 182 of the opposing body, it spreads around the entire circumference of the side surface 182.
[0060] Because the corner 188 is a sharp corner, liquid that has moved to the corner 188 is unlikely to form a liquid pool on it. Therefore, the liquid moves away from the corner 188 by the airflow along the side surface 182 of the opposing body and the airflow SW1 without forming a liquid pool. As a result, the liquid is atomized. The liquid is atomized to a diameter of, for example, 50 micrometers or less.
[0061] In this embodiment, the implement 2 uses an electric motor 46. The airflow of the fan 44 of the electric motor-driven implement 2 is lower than that of the fan 44 of the engine-driven implement. Even with this configuration, the liquid can be atomized by using the liquid nozzle 122 of this embodiment.
[0062] As shown in Figure 7, the atomized liquid flows through the tip tube 66 together with the air flowing inside the cylindrical member 120 indicated by arrow F1. Subsequently, the liquid and air flowing inside the cylindrical member 120 merge with the air flowing outside the cylindrical member 120 indicated by arrow F2, and are released (sprayed) from the diffusion cover 70 to the outside of the second tip tube 68.
[0063] (effect) The implement 2 in this embodiment is a mist blower. The implement 2 comprises 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 positioned inside the discharge pipe 10 for discharging the liquid stored in the liquid tank 24 into the discharge pipe 10, and a counter body 134 separated from the liquid nozzle body 132. The liquid nozzle body 132 has a throttling passage 164 (an example of a throttling section) having a minimum diameter D1, a liquid passage 158 through which the liquid passes, and a nozzle side surface 150 through which air sent out by the fan 44 flows. The liquid is discharged from the discharge port 170 of the throttling passage 164. The counter body 134 has a counter surface 180 positioned opposite the discharge port 170, and a counter body side surface 182 connected to the counter surface 180 through which air sent out by the fan 44 flows.
[0064] According to the above configuration, the liquid discharged from the outlet 170 strikes the opposing surface 180 of the opposing body 134 and moves along the opposing surface 180 to the side surface 182 of the opposing body. After that, the liquid is separated from the opposing body 134 by the air blown out by the fan 44. This makes it possible to atomize the liquid.
[0065] The liquid nozzle 122 of this embodiment discharges liquid stored in the liquid tank 24 into a discharge pipe 10 through which air flows. The liquid nozzle 122 comprises a liquid passage 158 (an example of a through hole) extending in the front-rear direction (an example of a first direction), a base body 210 having the liquid passage 158 through which the liquid passes, and a press-fit body 178 that can be pressed into the base body 210. The liquid passage 158 comprises a throttling passage 164 (an example of a throttling section) having the smallest diameter D1 within the liquid passage 158, an inlet passage 160 (an example of a first hole) having a diameter larger than the diameter D1 of the throttling passage 164, and an outlet passage 168 (an example of a second hole) located on the opposite side of the throttling passage 160 from the inlet passage 160 and having a diameter larger than the diameter D1 of the throttling passage 164. The manufacturing method includes a press-fitting step in which the press-fitting body 178 is pressed into the outlet passage 168 to a position where it is a predetermined distance away from the constriction passage 164, and an opening forming step in which, after the press-fitting step, the base body 210 is cut in a direction perpendicular to the front-rear direction (an example of a second direction) at a position between the constriction passage 164 and the press-fitting body 178 to form openings 204 and 206 that penetrate the base body 210 from the side surface 212 to the inner surface 214.
[0066] In the liquid nozzle 122 manufactured by the above manufacturing method, the liquid released from the throttling passage 164 strikes the inlet 178 and moves along the inlet 178 towards the openings 204 and 206. The liquid then exits the liquid nozzle 122 through the openings 204 and 206. The liquid is then separated from the liquid nozzle 122 by the air flowing around it. This allows the liquid to be atomized.
[0067] Furthermore, the second nozzle side surface 154 of the nozzle side surface 150 has a circular shape. The opposing body side surface 182 also 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] With the above configuration, even if the air flows along the second nozzle side surface 154 of the liquid nozzle body 132 and then along the opposing body side surface 182 of the opposing body 134, a decrease in the airflow velocity can be suppressed. This makes it possible to atomize the liquid more finely.
[0069] Furthermore, the work machine 2 is further equipped with a connecting body 136 that connects the liquid nozzle body 132 and the opposing body 134.
[0070] With the above configuration, the position of the opposing body 134 relative to the liquid nozzle body 132 can be fixed. This allows for stable atomization of the liquid.
[0071] Furthermore, with respect to the circumferential direction of the opposing body side surface 182, the sum of lengths L4 and L5 (the length of the outer surface of the connecting body 136) is 50% or less of the length of the opposing body side surface 182.
[0072] With the above configuration, the liquid can be moved along the entire circumference of the opposing body side surface 182. This allows the liquid to be atomized more finely.
[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 throttling passage 164.
[0074] When the distance L1 between the opposing surface 180 and the liquid nozzle body 132 is less than 200% of the diameter D1 of the throttling passage 164, the liquid discharged from the outlet 170 accumulates between the liquid nozzle body 132 and the opposing body 134, suppressing the atomization of the liquid. 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 throttling passage 164, the flow velocity of the air flowing along the side surface 182 of the opposing body 134 decreases compared to a configuration where the distance L1 between the opposing surface 180 and the liquid nozzle body 132 is 600% or less of the diameter D1 of the throttling passage 164. This suppresses the atomization of the liquid. According to the above configuration, the liquid can be atomized.
[0075] (Second example) A second embodiment will be described with reference to Figure 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 parts. In Figure 15, the boundary 300 between the liquid nozzle body 132 and the connector 136 is shown by a dashed-dotted line. The connector 136 has a projection 302 protruding from its rear end surface. The liquid nozzle body 132 has a recessed groove 304 recessed from its front end surface 132a. In Figure 15, the projection 302 and the recessed groove 304 are hidden and not visible, so they are shown by a dashed-dotted line. The projection 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 integrally formed with the opposing body 134 and is separate from the liquid nozzle body 132.
[0077] According to the above configuration, the liquid nozzle body 132, the opposing body 134, and the connecting body 136 can be easily manufactured.
[0078] (Third embodiment) A third embodiment will be described with reference to Figure 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 (four in this embodiment) of openings 350. The openings 350 penetrate the connector 136 from the inner surface to the outer surface. With respect to the circumferential direction of the outer surface of the connector 136, the four openings 350 are arranged at equal intervals. The openings 350 have a substantially cylindrical shape. In the third embodiment, the liquid is discharged from the outlet 170 of the liquid nozzle body 132, hits the opposing surface 180 of the opposing body 134, passes through the openings 350 and moves to the side surface 182 of the opposing body.
[0079] (Fourth embodiment) A fourth embodiment will be described with reference to Figure 17. In the fourth embodiment, only the differences from the first embodiment will be described. In the fourth embodiment, the front end surface 184 of the opposing body 134 comprises 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 center of the circle of the first front end surface 400 is located 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 located on the periphery of the first front end surface 400. The second front end surface 402 encircles 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 side surface 182 of the opposing body. The angle A formed by the second front end surface 402 and the opposing side surface 182 is greater than 1 degree and less than 180 degrees. In this embodiment, angle A is greater than 1 degree and 90 degrees or less.
[0080] (Fifth example) A fifth embodiment will be described with reference to Figure 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 side surface 182 of the opposing body at a side connection point 190. The second curved portion 452 is connected to the front end surface 184 of the opposing body 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 planar shape.
[0081] (modified version) The work machine 2 according to one embodiment may be an engine-powered work machine.
[0082] In one embodiment, the work machine 2 may be equipped with a built-in battery. In this case, the built-in battery is charged by connecting the power cord to an external power source. Alternatively, the work machine 2 may not be equipped with a built-in battery. In this case, the work machine 2 operates on power supplied from an external power source via the power cord.
[0083] The work machine 2 according to one embodiment is not limited to a backpack-type work machine, but may also be a stationary work machine or a handheld work machine, for example.
[0084] In one embodiment of the liquid nozzle 122, the corner portion 188 may be located only on a portion of the circumferential edge of the opposing body side surface 182.
[0085] In one embodiment of the liquid nozzle 122, the cross-section of the opposing body side surface 182 may be polygonal, for example, hexagonal, octagonal, decagonal, or dodecagonal.
[0086] In one embodiment of the liquid nozzle 122, the liquid nozzle body 132, the opposing body 134, and the connecting body 136 may be integrally formed.
[0087] In one embodiment, the liquid nozzle 122 does not necessarily have a 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: Cylindrical member 122: Liquid nozzle 132: Liquid nozzle body 132a: Front end surface 134: Opposing body 136: Connector 142: Nozzle part 150: Nozzle side 158:Liquid passage 160: Entrance passage 162: First Transition Passage 164: Narrow passage 166: Second Transition Passage 168:Exit passage 170: Outlet 176: Impeded body 178: Press-fit body 180: Opposing surface 182: Side view of opposing body 184: Opposite body front end surface 188: Corner 200: First connection 200a: Inner surface 200b: External surface 202: Second connection 202a: Inner surface 202b: External surface 204: First opening 206: Second opening 210: Base body 212: Side view 214: Inner self 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 liquids, Fans, A discharge pipe through which the air sent out by the aforementioned fan flows, A liquid nozzle body is positioned inside the discharge pipe and discharges the liquid stored in the liquid tank into the discharge pipe, The opposing body, which is separated from the liquid nozzle body, It comprises a connecting body that connects the liquid nozzle body and the opposing body, The aforementioned liquid nozzle body is It has a constriction portion having the smallest diameter, and a liquid passage through which the liquid passes, It is equipped with a nozzle side through which the air sent out by the aforementioned fan flows, The liquid is discharged from the outlet of the throttling section. The opposing body is A facing surface positioned opposite the aforementioned discharge port, It comprises an opposing side of the body connected to the aforementioned opposing surface, through which air blown out by the fan flows, A mist blower in which the entire connecting body is positioned in the space between the liquid nozzle body and the opposing body.
2. The nozzle side surface has a circular shape with a first diameter, The side surface of the opposing body has a circular shape with a second diameter, The mist blower according to claim 1, wherein the second diameter is 60% or more and 100% or less of the first diameter.
3. The mist blower according to claim 1, wherein, with respect to the circumferential direction of the side surface of the opposing body, the length of the outer surface of the connecting body is 50% or less of the length of the side surface of the opposing body.
4. The mist blower according to claim 1, wherein the connecting body is integrally formed with the opposing body and is separate from the liquid nozzle body.
5. The mist blower according to any one of claims 1 to 4, 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 constricted portion.
6. A method for manufacturing a liquid nozzle that discharges liquid stored in a liquid tank into a discharge pipe through which air flows, The aforementioned liquid nozzle is A through hole extending in a first direction, a base body having the through hole through which the liquid passes, It comprises a press-fitting body that can be press-fitted into the base body, The aforementioned through hole is A constricted portion having the smallest diameter within the through hole, A first hole having a diameter larger than the diameter of the aforementioned diaphragm, The aperture portion is positioned on the opposite side of the first hole portion from the aperture portion, and comprises a second hole portion having a larger diameter than the diameter of the aperture portion. The aforementioned manufacturing method is A press-fitting step of press-fitting the press-fitting body into the second hole to a position a predetermined distance away from the constricted portion, The process includes, after the press-fitting step, an opening forming step in which the base body is cut in a second direction perpendicular to the first direction at a position between the constricted portion and the press-fitted body, thereby forming an opening that penetrates the base body from the side surface to the inner surface. The opening forming step forms a first portion of the base body located on the constricted portion side of the opening, a second portion of the base body located on the press-fit body side of the opening, and a third portion of the base body connecting the first portion and the second portion. A manufacturing method in which the entirety of the third part is placed in the space between the first part and the second part.
Citation Information
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