Trigger-type liquid dispenser

Abstract

To perform continuous injection while performing misty spray having coarse particle-sized diameters (liquid droplet diameters) of liquid droplets.SOLUTION: A trigger type liquid injector 1 includes: an injector body 2; and a nozzle member 3 in which an injection hole 4 is formed. The injector body has a vertical supply cylinder section 10 and a trigger mechanism 80 which circulates liquid from the inside of the vertical supply cylinder section toward the injection hole side in a state where liquid is accumulated by movement of a trigger section 81 to a rear side. The nozzle member has a nozzle cylinder section 120, a nozzle shaft section 121, and a nozzle tip 122 in which the injection hole is formed. A spin chamber for turning liquid and a spin groove for feeding liquid into the spin chamber are formed on an internal surface of the nozzle tip. In the nozzle shaft section, a recess 135 into which a part of liquid flowing to the spin chamber through the spin groove temporarily flows is formed.SELECTED DRAWING: Figure 1

Description

【Technical Field】 【0001】 The present invention relates to a trigger-type liquid ejector. 【Background Art】 【0002】 A trigger-type liquid ejector that sucks up a liquid from inside a container body by operating a trigger part and ejects the liquid through an ejection hole is known. As this type of trigger-type liquid ejector, for example, as shown in Patent Document 1 below, there is known a trigger-type liquid ejector including an ejector main body attached to a container body in which a liquid is stored, and a nozzle member in which an ejection hole for ejecting the liquid is formed. 【0003】 The ejector main body mainly includes a vertical supply cylinder part that sucks up the liquid inside the container body, a connection cylinder part that extends forward from the vertical supply cylinder part, a trigger part that is arranged to be movable backward in a forward biasing state and ejects the liquid toward the ejection hole side through the inside of the vertical supply cylinder part and the connection cylinder part by moving backward, a storage cylinder into which the liquid that has passed through the inside of the vertical supply cylinder part and the connection cylinder part is supplied due to the backward movement of the trigger part, and a storage plunger that is movably arranged inside the storage cylinder, moves backward as the liquid is supplied into the storage cylinder, and is biased forward by a biasing member. 【0004】 In the above trigger-type liquid ejector, by operating the trigger part, it is possible to eject the liquid from the ejection hole to the outside while storing the liquid in the storage cylinder, and even when the trigger part is not operated, it is possible to eject the liquid using the storage plunger. Thereby, continuous ejection of the liquid is made possible. 【Prior Art Documents】 【Patent Documents】 【0005】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2017 - 213497 【Summary of the Invention】 [Problems that the invention aims to solve] 【0006】 In a trigger-type liquid dispenser equipped with a storage cylinder and a storage plunger, pressure can be accumulated by moving the storage plunger, which is biased forward by the biasing force of a biasing member, backward, thereby spraying the liquid under pressure. As a result, the liquid sprayed through the nozzle tends to be sprayed in a fine mist containing small droplets (liquid droplet diameters). However, this leaves the challenge of accurately spraying the mist-like liquid to a targeted location. In particular, the smaller the diameter of the liquid droplets, the more easily the mist-like liquid can float in the air, leading to problems such as adhesion to unintended areas and increased inhalation by the user. Therefore, depending on the type of liquid and its application, it is necessary to produce a mist-like spray with coarser droplets. 【0007】 The present invention has been made in view of these circumstances, and its object is to provide a trigger-type liquid dispenser that can produce a mist-like spray with a coarse droplet size (droplet diameter). [Means for solving the problem] 【0008】 (1) The trigger-type liquid dispenser according to the present invention comprises a dispenser body attached to a container body containing liquid, and a nozzle member attached to the dispenser body and having a discharge hole formed therein for discharging liquid, wherein the dispenser body has a vertical supply cylinder portion for drawing up the liquid from the container body, and a trigger portion disposed to be movable to the rear in a forward biased state, and a trigger mechanism that causes the liquid to flow from the vertical supply cylinder portion toward the discharge hole side in a pressurized state when the trigger portion moves toward the rear, wherein the nozzle member comprises a nozzle cylinder portion to which the pressurized liquid is supplied, a nozzle shaft portion located inside the front end of the nozzle cylinder portion, and a nozzle tip attached to the nozzle shaft portion and having the discharge hole formed therein, The ejection holes are formed coaxially with the axis of the nozzle shaft, The inner surface of the nozzle tip facing the tip surface of the nozzle shaft portion is connected to the ejection hole and the nozzle shaft portion The aforementioned A concave spin chamber is formed to swirl the liquid around its axis, and a spin groove is formed extending outward from the spin chamber to deliver the liquid into the spin chamber. The nozzle shaft is formed with a recess into which a portion of the liquid heading towards the spin chamber via the spin groove temporarily flows. The recess is formed on the tip surface of the nozzle shaft portion, in the portion facing the spin chamber in the axial direction, and opens forward. The recess has a predetermined depth extending rearward from the tip surface of the nozzle shaft portion and is formed in a bottomed cylindrical shape with a diameter larger than the diameter of the ejection hole, centered on the axis. The recess is characterized by temporarily allowing a portion of the liquid that has passed through the spin groove to flow into it, thereby weakening the rotation of the liquid flowing from the spin groove into the spin chamber. 【0009】 According to the trigger-type liquid dispenser of the present invention, by operating the trigger and moving it backward, the liquid can be circulated from inside the vertical supply cylinder toward the discharge hole. This allows the pressurized liquid to be discharged outwards through the discharge hole of the nozzle member. Incidentally, when ejecting liquid through a nozzle, the pressurized liquid can be supplied to the spin chamber through the spin groove, allowing the pressurized liquid to swirl along the circumferential wall of the spin chamber. Therefore, the pressurized liquid can be forcefully ejected from the nozzle while being spun, enabling it to be sprayed outwards in a mist-like form. 【0010】 In particular, a portion of the liquid flowing towards the spin chamber via the spin groove can be temporarily diverted into a recess formed in the nozzle shaft, thereby reducing the pressure or velocity of the liquid swirling within the spin chamber. Consequently, it is possible to suppress the formation of minute particle sizes (droplet diameters) and to produce a mist-like spray that includes coarse droplets. Furthermore, any liquid that temporarily flows into the recess will, after a delay, swirl within the spin chamber as the liquid is ejected from the nozzle, and then be ejected from the nozzle as a mist. Therefore, ultimately, almost all of the liquid supplied to the spin groove can be atomized within a predetermined spraying time. Furthermore, since the recess is positioned opposite the spin chamber and opens toward the spin chamber, a portion of the liquid supplied to the spin chamber can be efficiently directed into the recess. Consequently, it becomes easier to further reduce the pressure or velocity of the liquid swirling in the spin chamber, enabling the production of a coarse mist-like spray. Furthermore, by adjusting the depth and diameter of the recesses, it is possible to adjust, for example, the coarseness of the droplet size or the spraying time, allowing for optimal dispensing depending on the type of liquid and its intended use. 【0011】 (2) The ejector body comprises a storage cylinder into which liquid that has passed through the vertical supply cylinder is supplied when the trigger portion moves backward, and a storage plunger disposed within the storage cylinder so as to be movable in the axial direction along the central axis of the storage cylinder, and which moves toward one side of the axial direction as liquid is supplied into the storage cylinder and is biased toward the other side, and the nozzle cylinder portion is positioned in front of the storage cylinder and attached to the ejector body, pressurized liquid is supplied from the storage cylinder, and the storage plunger may move toward one side when the liquid pressure in the storage space reaches a predetermined value, and thereafter move toward the other side to supply the pressurized liquid in the storage space toward the nozzle cylinder hole side. 【0012】 In this case, by operating the trigger and moving it backward, liquid can be supplied from the vertical supply cylinder into the storage space of the storage cylinder. This allows the liquid in the storage space to be pressurized until the storage plunger moves to one side in the axial direction. Then, when the liquid pressure in the storage space reaches a predetermined value, the storage plunger moves to one side in the axial direction against the biasing force directed to the other side in the axial direction. Therefore, each time the trigger is pulled, the storage plunger is moved to one side in the axial direction, allowing the pressurized liquid to be ejected while accumulating (filling) the liquid in the storage space. 【0013】 Furthermore, after filling the storage cylinder with liquid, stopping the operation of the trigger unit stops the supply of liquid to the storage cylinder through the vertical supply cylinder, but the storage plunger begins to move back to its original position in the other axial direction. This allows the liquid that has been filled and pressurized in the storage cylinder to be pushed out from the storage cylinder through the nozzle cylinder towards the ejection hole, and ejected from the ejection hole. Therefore, continuous ejection of liquid, i.e., continuous mist spraying, becomes possible. 【0018】 ( 3 The recess may be formed with a depth within the range of 0.4 mm to 1.5 mm. 【0019】 In this case, it is possible to effectively exclude fine droplets with a small particle diameter while suppressing a reduction in the spraying time. For example, when the depth is shallower than 0.4 mm, it becomes difficult for the liquid to flow into the recess, so the liquid sprayed in a mist form from the ejection hole is likely to contain fine droplets with a small particle diameter. On the other hand, when the depth exceeds 1.5 mm, a large amount of the liquid easily flows into the recess, and accordingly, the spraying time through the ejection hole becomes shorter. 【0020】 ( 4 ) The recess may be formed within a range where the diameter is 0.4 mm to 0.7 mm. 【0021】 In this case, it is possible to effectively exclude fine droplets with a small particle diameter while suppressing a reduction in the spraying time. For example, when the diameter is smaller than 0.4 mm, it becomes difficult for the liquid to flow into the recess, so the liquid sprayed in a mist form from the ejection hole is likely to contain fine droplets with a small particle diameter. On the other hand, when the diameter exceeds 0.7 mm, a large amount of the liquid easily flows into the recess, and accordingly, the spraying time through the ejection hole becomes shorter. 【Advantages of the Invention】 【0022】 According to the trigger-type liquid ejector according to the present invention, it is possible to perform a mist-like spraying including droplets with a large particle diameter (droplet diameter). 【Brief Description of the Drawings】 【0023】 [Figure 1] It is a longitudinal sectional view showing an embodiment of a trigger-type liquid ejector according to the present invention. [Figure 2] It is an enlarged sectional view of the periphery of the nozzle tip shown in FIG. 1. [Figure 3] It is an enlarged sectional view of the periphery of the nozzle tip in a conventional trigger-type liquid ejector. 【Mode for Carrying Out the Invention】 【0024】 Hereinafter, embodiments of the trigger-type liquid dispenser according to the present invention will be described with reference to the drawings. In this embodiment, a dispenser container in which the trigger-type liquid dispenser is attached to a container body will be described as an example. 【0025】 As shown in Figure 1, the trigger-type liquid dispenser 1 of this embodiment comprises a dispenser body 2 attached to a container body A that contains liquid, a nozzle member 3 having a discharge hole 4 for discharging liquid and attached to the dispenser body 2, and a cover body 5 that covers the dispenser body 2 and the nozzle member 3. Unless otherwise specified, each component of the trigger-type liquid dispenser 1 is a molded product made of synthetic resin. 【0026】 (Ejector body) The ejector body 2 mainly comprises a vertical supply cylinder section 10, a connecting cylinder section 20, a mounting cap 30, a storage cylinder 40, a storage plunger 50, a biasing member 60, an injection cylinder section 70, a trigger mechanism 80, a ball valve 90, and a storage valve 91. 【0027】 In this embodiment, the central axis of the vertical supply cylinder 10 is defined as axis O1, the side of the container body A along axis O1 is referred to as the lower side, and the opposite side as the upper side, and the direction along axis O1 is referred to as the up-down direction. Furthermore, in a plan view from the up-down direction, one direction intersecting axis O1 is referred to as the front-back direction, and the direction perpendicular to both the up-down direction and the front-back direction is referred to as the left-right direction. 【0028】 Furthermore, in this embodiment, the central axis of the storage cylinder 40 is defined as axis O2. In this embodiment, axis O2 extends in the front-rear direction. Therefore, in this embodiment, the front-rear direction corresponds to the axial direction along the central axis of the storage cylinder 40. In this embodiment, the rear corresponds to one axial direction along the central axis of the storage cylinder 40, and the front corresponds to the other axial direction along the central axis of the storage cylinder 40. However, the axial direction along axis O2 does not necessarily have to coincide with the front-rear direction. 【0029】 The vertical supply cylinder 10 extends vertically and has the function of drawing up liquid from the container body A. The vertical supply cylinder 10 is attached to the container body A by a mounting cap 30. The upper part of the pipe 11, which extends vertically and draws up liquid from the container body A, is fitted into the vertical supply cylinder 10. 【0030】 As shown in Figure 1, a connecting cylinder portion 20 extending forward is provided at the upper end of the vertical supply cylinder portion 10. The connecting cylinder portion 20 is formed in a cylindrical shape having an opening 21 that opens in front of the ejector body 2, and communicates with the inside of the vertical supply cylinder portion 10. A sealing plug 100 is attached to the opening 21 of the connecting cylinder portion 20 from the front, sealing the opening 21. 【0031】 Below the connecting cylinder portion 20 and above the mounting cap 30, a cylinder portion 110 is provided. The cylinder portion 110 protrudes forward from the vertical supply cylinder portion 10 and is open to the front. A main cylinder 82 is fitted inside the cylinder portion 110. The main cylinder 82 is formed as a bottomed cylinder that is open to the front and closed to the rear. The inside of the main cylinder 82 is in communication with the inside of the vertical supply cylinder portion 10. 【0032】 Furthermore, a restricting member 101, which restricts the forward disengagement of the main piston 83 (described later), is fitted to the main cylinder 82 from the front. The restricting member 101 comprises an outer cylindrical portion that fits onto the main cylinder 82 and an inner cylindrical portion that is inserted inside the main cylinder 82 and positioned on the inner side of the inner circumferential surface of the main cylinder 82. Furthermore, in the inner cylindrical portion of the regulating member 101, the part facing the inner circumferential surface of the main cylinder 82 has multiple grooves formed at intervals in the circumferential direction. As a result, there is no seal between the main cylinder 82 and the regulating member 101. 【0033】 The storage cylinder 40 is positioned above the vertical supply cylinder 10 and the connecting cylinder 20. In this embodiment, the lower end of the storage cylinder 40 is formed integrally with the upper end of the vertical supply cylinder portion 10 and the upper end of the connecting cylinder portion 20. The liquid that has passed through the vertical supply cylinder 10 and the connecting cylinder 20 is supplied to the inside of the storage cylinder 40 (storage space 40a, described later) by the backward swinging of the trigger unit 81. 【0034】 Specifically, a supply hole 41 is formed in the lower part of the front end of the storage cylinder 40, which communicates with the connecting cylinder 20. The supply hole 41 opens in a part located behind the closing plug 100. This makes it possible to supply the liquid that has passed through the vertical supply cylinder 10 and the connecting cylinder 20 into the storage cylinder 40 through the supply hole 41. 【0035】 The storage plunger 50 is positioned within the storage cylinder 40 so as to be movable in the front-rear direction along the axis O2. This allows the storage plunger 50 to slide closely in the front-rear direction within the storage cylinder 40. The storage plunger 50 moves backward as liquid is supplied into the storage cylinder 40. The storage plunger 50 blocks communication between the vertical supply cylinder 10 and the discharge hole 4 through the connecting cylinder 20, and when it moves backward, it allows communication between the vertical supply cylinder 10 and the discharge hole 4 through the connecting cylinder 20. 【0036】 In other words, the storage plunger 50, at its foremost position, blocks communication between the vertical supply cylinder 10 and the ejection hole 4 (inside the injection cylinder 70) through the connecting cylinder 20, and allows communication between the vertical supply cylinder 10 and the ejection hole 4 (inside the injection cylinder 70) through the connecting cylinder 20 when it moves backward from its foremost position. In the storage cylinder 40, the space located in front of the storage plunger 50 functions as a storage space 40a. 【0037】 The storage space 40a stores the liquid that passes through the vertical supply cylinder 10 and the connecting cylinder 20, as well as the supply hole 41. The storage space 40a expands as the storage plunger 50 moves backward due to the supply of liquid. The storage space 40a can also communicate with the injection cylinder 70, which will be described later. 【0038】 The biasing member 60 biases the storage plunger 50 forward. The biasing member 60 is positioned behind the storage plunger 50 within the storage cylinder 40. In the initial state before the trigger unit 81 is operated, the biasing member 60 biases the storage plunger 50 forward. As a result, the storage plunger 50 is in its furthest forward position. The biasing member 60 is a metal coil spring arranged coaxially with the axis O2. However, for example, a resin spring or other elastic material may be used as the biasing member 60. 【0039】 In the storage cylinder 40 and storage plunger 50 configured as described above, it is possible to pressurize the liquid in the storage space 40a until the storage plunger 50 moves backward. Then, when the liquid pressure in the storage space 40a reaches a predetermined value, the storage plunger 50 moves backward against the biasing member 60. This makes it possible to supply the liquid in the storage space 40a to the ejection hole 4 side. Therefore, the storage plunger 50 can function as a pressure accumulator valve. 【0040】 The injection cylinder section 70 extends forward from the storage cylinder 40. The injection cylinder section 70 communicates with the inside of the vertical supply cylinder section 10 through the inside of the storage cylinder 40 (storage space 40a) and the inside of the connecting cylinder section 20. This allows the injection cylinder section 70 to guide the liquid that has passed through the inside of the vertical supply cylinder section 10, the connecting cylinder section 20, and the inside of the storage cylinder 40 (storage space 40a) to the ejection hole 4. 【0041】 The trigger mechanism 80 comprises a trigger section 81, a main cylinder 82, a main piston 83, and a coil spring 84. The trigger mechanism 80 is capable of circulating liquid from within the vertical supply cylinder section 10 through the connecting cylinder section 20 toward the ejection hole 4 by the backward swinging of the trigger section 81. 【0042】 The trigger section 81 is positioned in front of the vertical supply cylinder section 10 so as to be movable backward while biased forward. The trigger section 81 is formed to extend in the vertical direction and is positioned below the injection cylinder section 70. The upper end of the trigger section 81 is pivotally supported by the nozzle member 3 so as to be able to swing in the front-rear direction, and the lower end is positioned in front of the main cylinder 82. 【0043】 In the illustrated example, a stopper T is detachably provided in the gap between the trigger portion 81 and the restricting member 101 in the front-rear direction. The stopper T restricts the backward swing of the trigger portion 81 by contacting both the trigger portion 81 and the restricting member 101. However, the stopper T is not essential and may be omitted. 【0044】 The main piston 83 is positioned inside the main cylinder 82 so as to be movable in the front-rear direction. The main piston 83 is designed to move in the front-rear direction in conjunction with the oscillation of the trigger portion 81. As a result, the inside of the main cylinder 82 is pressurized and depressurized as the main piston 83 moves in the front-rear direction. The main piston 83 is formed in a top-closed cylindrical shape, with an opening at the rear and a closed front. 【0045】 The main piston 83 is biased forward by the biasing force of the coil spring 84 together with the trigger portion 81. The main piston 83 moves backward as the trigger portion 81 swings backward and is pushed into the main cylinder 82. The main piston 83 is located in the foremost position corresponding to when the trigger portion 81 is in its foremost swinging position. Furthermore, the main piston 83 is prevented from coming out forward by the inner cylinder portion of the regulating member 101. 【0046】 The coil spring 84 is made of metal, for example. The coil spring 84 is arranged coaxially with the main piston 83 and the main cylinder 82, and biases the trigger portion 81 forward via the main piston 83. The coil spring 84 is positioned between the bottom wall of the main piston 83 and the top wall of the main cylinder 82. However, the material of the coil spring 84 is not limited to metal; for example, a resin spring may be used. 【0047】 The ball valve 90 and the storage valve 91 are located within the vertical supply cylinder section 10. The ball valve 90 is a check valve that, when pressurized in the main cylinder 82, blocks communication between the container body A through the vertical supply cylinder 10 and the main cylinder 82, and when the pressure inside the main cylinder 82 is reduced, displaces upward, thereby allowing communication between the container body A through the vertical supply cylinder 10 and the main cylinder 82. 【0048】 A storage valve 91 is positioned above the ball valve 90. The storage valve 91 is a check valve that allows the supply of liquid from the vertical supply cylinder 10 through the connecting cylinder 20 into the storage cylinder 40, while restricting the outflow of liquid from the storage cylinder 40 through the connecting cylinder 20 into the vertical supply cylinder 10. 【0049】 The cover body 5 is formed to cover the entire vertical supply cylinder portion 10 except for the lower end, the entire injection cylinder portion 70, and the entire storage cylinder 40 from at least both sides in the left-right direction and from above. 【0050】 (Nozzle component) The nozzle component 3 is mainly assembled to the ejector body 2 using the injection cylinder portion 70. The nozzle member 3 comprises a nozzle cylinder portion 120, a nozzle shaft portion 121 positioned inside the front end of the nozzle cylinder portion 120, and a nozzle tip 122 mounted on the nozzle shaft portion 121. The nozzle tip 122 has an ejection hole 4 that opens forward and ejects liquid forward. 【0051】 The nozzle cylinder portion 120 is positioned in front of the storage cylinder 40 and is fitted onto the injection cylinder portion 70 from the front. Thus, the entire nozzle member 3 is assembled to the sprayer body 2 using the injection cylinder portion 70. Since the injection cylinder portion 70 is positioned inside the nozzle cylinder portion 120, liquid from the storage cylinder 40 is supplied into the nozzle cylinder portion 120. 【0052】 In this embodiment, the nozzle cylinder portion 120 is positioned such that its central axis, axis O3, is located above the central axis of the storage cylinder 40, axis O2. However, the positional relationship between the nozzle cylinder portion 120 and the storage cylinder 40 is not limited to this case. In a plan view from the direction of axis O3, the direction intersecting axis O3 is called the radial direction, and the direction that circles around axis O3 is called the circumferential direction. 【0053】 As shown in Figure 2, the nozzle shaft portion 121 is positioned inside the front end of the nozzle cylinder portion 120 and is coaxial with the axis O3. The nozzle shaft portion 121 is formed in a cylindrical shape with an outer diameter smaller than the inner diameter of the nozzle cylinder portion 120. As a result, an annular gap (flow channel) is formed between the nozzle cylinder portion 120 and the nozzle shaft portion 121, centered on the axis O3. Furthermore, the tip surface 121a of the nozzle shaft portion 121 is positioned behind the front opening edge of the nozzle cylinder portion 120. 【0054】 At the rear end of the nozzle shaft portion 121, a communication hole 125 is formed at a circumferential spacing, connecting the area of ​​the nozzle cylinder portion 120 located behind the nozzle shaft portion 121 with the aforementioned annular gap (flow channel). This makes it possible to supply the liquid supplied into the nozzle cylinder portion 120 to the annular gap through the communication hole 125. 【0055】 The nozzle tip 122 is formed in a top-cylindrical shape having a tip wall portion 122a and a tip cylindrical portion 122b, and is arranged coaxially with the axis O3. The tip wall portion 122a is positioned forward of the tip surface 121a of the nozzle shaft portion 121, so as to face it. The tip cylindrical portion 122b is formed to extend rearward from the outer peripheral edge of the tip wall portion 122a, surrounding the nozzle shaft portion 121 from the radial outside. As a result, the nozzle tip 122 is formed in a top-opening cylindrical shape. 【0056】 The nozzle tip 122 is fitted inside the nozzle cylinder 120 so as to block the nozzle shaft portion 121 from the front. At this time, the tip cylinder portion 122b is fitted inside the nozzle cylinder 120 with a gap between it and the outer circumferential surface of the nozzle shaft portion 121. Furthermore, the tip wall portion 122a is positioned inside the nozzle cylinder 120 in a position forward of the tip surface 121a of the nozzle shaft portion 121. 【0057】 The ejection hole 4 is formed to penetrate the tip wall portion 122a in the front-rear direction and is also formed coaxially with the axis O3. Furthermore, the rear surface of the tip wall portion 122a is formed with a concave spin chamber 130 that communicates with the ejection hole 4 and causes the liquid to swirl inside around the axis O3, and a spin groove 131 that extends from the spin chamber 130 toward the inner circumferential surface of the tip cylindrical portion 122b and supplies liquid to the spin chamber 130. 【0058】 The spin chamber 130 is formed to be recessed towards the front and is circular in shape when viewed from the axis O3 in a plan view. The spin grooves 131 are formed, for example, to extend tangentially to the circumferential wall of the spin chamber 130, and they send the liquid that has passed between the nozzle shaft portion 121 and the tip wall portion 122a into the spin chamber 130. This allows the liquid that has passed through the spin grooves 131 to swirl along the circumferential wall of the spin chamber 130. Therefore, the liquid can be forcefully ejected from the ejection hole 4 while being spun, and sprayed outwards in a mist. Note that multiple spin grooves 131 are formed at intervals in the circumferential direction. 【0059】 Furthermore, a recess 135 is formed in the nozzle shaft portion 121 into which a portion of the liquid heading towards the spin chamber 130 via the spin groove 131 temporarily flows. The recess 135 is formed on the tip surface 121a of the nozzle shaft portion 121, in the portion facing the spin chamber 130 in the direction of axis O, and is open toward the front. Specifically, the recess 135 is formed in a bottomed cylindrical shape having a predetermined depth N extending rearward from the tip surface 121a of the nozzle shaft portion 121, and having a predetermined diameter D centered on the axis O3. 【0060】 (The operation of a trigger-type liquid dispenser) Next, we will describe the case in which the trigger-type liquid dispenser 1 configured as described above is used. It is assumed that by operating the trigger part 81 shown in Figure 1 multiple times, the liquid is filled into each part of the trigger-type liquid dispenser 1, and the liquid can be drawn up into the vertical supply cylinder part 10. 【0061】 After removing the stopper T, when the trigger 81 is pulled backward against the biasing force of the coil spring 84, the main piston 83 moves backward from its foremost position, and the inside of the main cylinder 82 is pressurized. As a result, the liquid inside the main cylinder 82 is supplied to the vertical supply cylinder 10. The liquid supplied to the vertical supply cylinder 10 pushes the ball valve 90 downward and pushes up the storage valve 91. 【0062】 This allows the liquid in the vertical supply cylinder 10 to be supplied to the storage space 40a of the storage cylinder 40 through the connecting cylinder 20 and the supply hole 41, thereby pressurizing the storage space 40a. As a result of the pressurization of the storage space 40a, the storage plunger 50 can be moved backward from its furthest forward position against the biasing force of the biasing member 60, thereby accumulating (filling) the liquid in the storage space 40a. As the storage plunger 50 moves backward, the liquid in the storage space 40a, which has increased in pressure, can be guided to the ejection hole 4 through the injection cylinder 70. This allows the pressurized liquid to be ejected forward from the ejection hole 4. 【0063】 As described above, each time the trigger 81 is pulled backward, liquid can be ejected from the ejection hole 4, and the storage plunger 50 can be moved backward to accumulate liquid in the storage space 40a. 【0064】 Subsequently, when the trigger section 81 is released, the main piston 83 returns to its original position forward within the main cylinder 82 due to the elastic restoring force (biasing force) of the coil spring 84, and the trigger section 81 also returns to its original position forward. As a result, the pressure inside the main cylinder 82 can be reduced to a pressure lower than the pressure inside container A, so that the ball valve 90 can be raised while the storage valve 91 remains closed. Consequently, the liquid inside container A can be drawn up into the vertical supply cylinder section 10 and introduced into the main cylinder 82. This allows us to prepare for the next eruption. 【0065】 When the operation of the trigger section 81 toward the rear is stopped, the supply of liquid to the storage space 40a through the vertical supply cylinder section 10 and the connecting cylinder section 20 stops, but the biasing force of the biasing member 60 causes the storage plunger 50 to start moving forward toward its furthest forward position. In this process, the outflow of liquid from the storage space 40a into the vertical supply cylinder section 10 is restricted by the storage valve 91. 【0066】 This allows the liquid accumulated and pressurized in the storage space 40a to be guided through the injection cylinder 70 to the ejection port 4, and the liquid to be continuously ejected forward through the ejection port 4. In this way, liquid can be ejected not only when the trigger unit 81 is pulled backward, but also when the trigger unit 81 is not operated, enabling continuous ejection of liquid. 【0067】 As described above, with the trigger-type liquid dispenser 1 of this embodiment, liquid can be dispensed not only when the trigger part 81 is pulled backward, but also when the trigger part 81 is not operated, and continuous liquid dispensing is possible. Furthermore, since the trigger portion 81 is pivotally supported at its upper end (fulcrum) on the nozzle member 3, and the main piston 83 is locked to the middle portion (point of application) of the trigger portion 81, for example, by operating the lower end (point of force application) of the trigger portion 81, the main piston 83 can be moved efficiently using the principle of leverage. This improves the operability of the trigger portion 81. 【0068】 Furthermore, according to the trigger-type liquid ejector 1 of this embodiment, when liquid is ejected through the ejection hole 4, specifically, as shown in Figure 2, the liquid supplied from the storage cylinder 40 side toward the nozzle cylinder portion 120 can be supplied between the nozzle shaft portion 121 and the tip cylinder portion 122b through the communication hole 125. In addition, the liquid supplied between the nozzle shaft portion 121 and the tip cylinder portion 122b can be supplied into the spin chamber 130 through the spin groove 131. This allows the liquid stored along the peripheral wall of the spin chamber 130 to swirl around the axis O3. Therefore, while spinning the stored liquid, it can be forcefully ejected from the ejection port 4 as shown by arrow F1 in Figure 2, allowing it to be sprayed outwards in a mist. 【0069】 Furthermore, when the liquid is swirled along the peripheral wall of the spin chamber 130 and ejected from the ejection port 4 while spinning, the centrifugal force during the swirling can be used to widen the ejection angle outwards. As a result, the liquid can be finely shredded, and a mist-like spray containing fine droplets M can be produced. 【0070】 In this embodiment, a portion of the liquid flowing towards the spin chamber 130 via the spin groove 131 can be temporarily directed into the recess 135, as shown by arrow F2 in Figure 2. This reduces the pressure or velocity of the liquid swirling within the spin chamber 130. Consequently, it is possible to suppress the development of minute droplet sizes (droplet diameters) and produce a mist-like spray containing coarse droplets M. More specifically, by providing the recess 135, the rotational force acting on the liquid flowing from the spin groove 131 into the spin chamber 130 can be reduced. This weakens the rotation of the liquid, making it less likely for the ejection angle of the liquid ejected from the ejection hole 4 to spread outwards. Consequently, as shown in Figure 2, the particle size of the liquid droplet M can be made coarser. 【0071】 Furthermore, any liquid that temporarily flows into the recess 135 will, after a delay, swirl within the spin chamber 130 as the liquid is ejected from the ejection hole 4, and then be ejected from the ejection hole 4 as a mist. Therefore, ultimately, almost all of the liquid supplied into the spin groove 131 can be atomized within a predetermined spraying time. 【0072】 In contrast, as shown in Figure 3, for example, if the recess 135 is not provided, the liquid supplied to the spin chamber 130 via the spin groove 131 swirls along the peripheral wall of the spin chamber 130 while maintaining high pressure and high speed, and is then ejected from the ejection hole 4 with a strong spin. Therefore, because the centrifugal force during swirling is strong, the ejection angle tends to spread outward more easily compared to the case shown in Figure 2. Consequently, a mist-like spray containing fine droplets M is produced. 【0073】 In this regard, according to the trigger-type liquid dispenser 1 of this embodiment, as mentioned above, the pressure or velocity of the liquid can be reduced by utilizing the recess 135, so that a mist-like spray containing droplets M with a larger particle size can be produced compared to Figure 3. 【0074】 As described above, the trigger-type liquid dispenser 1 of this embodiment allows for continuous spraying while producing a mist-like spray containing coarse-particle-sized liquid droplets M. Furthermore, in this embodiment, since the recess 135 is positioned opposite the spin chamber 130 and opens toward the spin chamber 130, a portion of the liquid supplied into the spin chamber 130 can be efficiently directed into the recess 135. Consequently, the pressure or velocity of the liquid swirling in the spin chamber 130 can be further reduced, enabling the production of a coarse mist-like spray. 【0075】 In particular, the recess 135 is formed in a bottomed cylindrical shape having a predetermined depth N and a predetermined diameter D. By appropriately adjusting the depth N and diameter D, it is possible to adjust, for example, the coarseness of the particle size or the spraying time. Therefore, it can be used in an optimal spraying manner according to the type of liquid and its intended use. 【0076】 Furthermore, as the depth N of the recess 135 is increased, the particle size can be made coarser, and the spraying time can be shortened. The same tendency occurs when the diameter D of the recess 135 is increased. Therefore, by arbitrarily adjusting the depth N and diameter D of the recess 135, it is possible to adjust the coarseness of the sprayed liquid particles and the spraying time. 【0077】 The specific depth N and diameter D of the recess 135 are as follows: Regarding the depth N, it is preferable that it be formed within the range of 0.4 mm to 1.5 mm. In this case, it is possible to effectively remove fine droplets M while suppressing a shortening of the spraying time. For example, if the depth N is shallower than 0.4 mm, the liquid will have difficulty flowing into the recess 135, making it easier for fine droplets M to be included in the liquid sprayed in a mist from the nozzle 4. On the other hand, if the depth N exceeds 1.5 mm, a large amount of liquid will easily flow into the recess 135, which will shorten the spraying time through the nozzle 4. For example, the spraying time may be around 0.8 seconds, which is undesirable. 【0078】 Regarding the diameter D, it is preferable that it be formed within the range of 0.4 mm to 0.7 mm. In this case, it is possible to effectively exclude fine droplets while suppressing a shortening of the spraying time. For example, if the diameter D is less than 0.4 mm, the liquid will have difficulty flowing into the recess 135, making it easier for fine droplets M to be included in the liquid sprayed in a mist from the nozzle 4. On the other hand, if the diameter D exceeds 0.7 mm, a large amount of liquid will easily flow into the recess 135, which will shorten the spraying time through the nozzle 4. In this case, for example, the spraying time will be about 0.8 seconds, which is undesirable. 【0079】 Although embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. Embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. Embodiments and their modifications include, for example, those that can be easily imagined by those skilled in the art, those that are substantially the same, and those that are equivalent. 【0080】 For example, in the above embodiment, the case in which the recess 135 is formed on the tip surface 121a of the nozzle shaft portion 121 was described as an example, but it is not limited to this case, and for example, at least one may be formed on the outer circumferential surface of the nozzle shaft portion 121. Even in this case, a portion of the liquid that flows into the spin chamber 130 via the spin groove 131 can be retained in the recess 135, so the same effect can be achieved. 【0081】 Furthermore, in the above embodiment, a trigger-type liquid ejector 1 equipped with a storage cylinder 40 and a storage plunger 50, which enables continuous injection, was described as an example, but it is not limited to continuous injection. Therefore, the storage cylinder 40 and the storage plunger 50 are not essential and do not need to be provided. If the storage plunger 50, which functions as a pressure accumulation valve, is not provided, a pressure accumulation valve may be provided in the injection cylinder section 70, or a known pressure accumulation valve may be provided in the nozzle section 3, or any other known pressure accumulation valve may be used as appropriate. [Explanation of Symbols] 【0082】 A...Container N... Depth of the recess D...Diameter of the recess O3... Axis of the nozzle shaft 1…Trigger-type liquid dispenser 2...Ejector body 3…Nozzle component 4…Blowout hole 10...Vertical supply cylinder section 40…Storage cylinder 50... Storage plunger 80... Trigger mechanism 81... Trigger part 120... Nozzle cylinder section 121... Nozzle shaft 130... Spin Room 131...Spin groove 135…recess

Claims

[Claim 1] A sprayer body that is attached to a container body containing liquid, The device comprises a nozzle member attached to the aforementioned ejector body, which has an ejection hole formed therein for ejecting liquid, The aforementioned spray body is, A vertical supply cylinder that draws up the liquid inside the container, The device comprises a trigger mechanism having a trigger portion that is movable to the rear in a forward biased state, and which, when the trigger portion moves to the rear, causes the liquid to flow from the vertical supply cylinder towards the ejection hole in a pressurized state, The nozzle member is A nozzle cylinder section into which pressurized liquid is supplied, The nozzle shaft portion located inside the front end of the nozzle cylinder portion, The nozzle comprises a nozzle tip mounted on the nozzle shaft and having the ejection hole formed therein, The ejection holes are formed coaxially with the axis of the nozzle shaft, The inner surface of the nozzle tip facing the tip surface of the nozzle shaft is formed with a concave spin chamber that communicates with the ejection hole and causes the liquid to swirl around the axis of the nozzle shaft, and a spin groove that extends outward from the spin chamber and delivers the liquid into the spin chamber. The nozzle shaft portion has a recess formed into which a portion of the liquid flowing towards the spin chamber via the spin groove temporarily flows. The recess is formed on the tip surface of the nozzle shaft portion, in the portion facing the spin chamber in the axial direction, and opens forward. The recess has a predetermined depth extending rearward from the tip surface of the nozzle shaft and is formed in a bottomed cylindrical shape with a diameter larger than the diameter of the ejection hole, centered on the axis. The trigger-type liquid dispenser is characterized in that the recess temporarily allows a portion of the liquid that has passed through the spin groove to flow into it, thereby weakening the rotation of the liquid flowing from the spin groove into the spin chamber. [Claim 2] In the trigger-type liquid dispenser according to claim 1, The aforementioned spray body is, The liquid that has passed through the vertical supply cylinder is supplied into the storage space by the rearward movement of the trigger portion, The storage cylinder comprises a storage plunger, which is disposed within the storage cylinder so as to be movable in the axial direction along the central axis of the storage cylinder, and which moves toward one side in the axial direction and is biased toward the other side in response to the supply of liquid into the storage cylinder, The nozzle cylinder is positioned in front of the storage cylinder and attached to the ejector body, and pressurized liquid is supplied from within the storage cylinder. A trigger-type liquid dispenser wherein the storage plunger moves to one side when the liquid pressure in the storage space reaches a predetermined value, and then moves toward the other side to supply the liquid in the storage space to the nozzle cylinder hole side while it is pressurized. [Claim 3] In the trigger-type liquid dispenser according to claim 1, The recess is formed in a trigger-type liquid dispenser with a depth in the range of 0.4 mm to 1.5 mm. [Claim 4] In the trigger-type liquid dispenser according to claim 1 or 3, The recess is formed within the range of 0.4 mm to 0.7 mm in diameter, and is a trigger-type liquid dispenser.

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