Pressurized sprayer

Abstract

To provide a pressure accumulation-type sprayer that can eliminate initial set pressure that is applied in an initial set state to a spring part, so as to suppress a valve structure (a valve body) having the spring part from plastically deforming as much as possible.SOLUTION: A pressure accumulation-type sprayer X comprises a cylinder body part B having a main cylinder portion B1 and a sub cylinder portion B2, and a cover part C mounted to cover the cylinder body part B. The pressure accumulation-type sprayer X, which is mounted on a container J, takes up liquid in the container J into the main cylinder portion B1 through a first valve FV, applies pressure to liquid in the main cylinder portion B1 and makes a nozzle part F spray the liquid through a valve structure A when the pressure exceeds a certain level. The valve structure A is mounted between a lower support portion B23 of the sub cylinder portion B2 and an upper support portion C1 of the cover part C. A length L1 of the valve structure A in an unloaded condition and a shortest distance L2 between the lower support portion B23 and the upper support portion C1 satisfy a relational expression of L1<L2.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a pressure accumulator type sprayer, and more specifically, to a pressure accumulator type sprayer that eliminates the pressing force (i.e., the initial set pressure) applied in a state where the trigger is not pulled (initial set state, that is, the valve is not open) to the valve structure, thereby suppressing deformation of the valve structure.

Background Art

[0002] Today, a pressure accumulator type sprayer equipped with a trigger for ejecting a liquid is widely known. This pressure accumulator type sprayer has a structure in which the trigger is pulled and the piston is slid with respect to the cylinder to increase the pressure of the liquid in the cylinder, and when the pressure exceeds a certain pressure, the liquid in the cylinder is vigorously ejected from the nozzle.

[0003] More specifically, the cylinder is disposed between two one-way valves (i.e., the first valve and the second valve). When the liquid in the cylinder introduced through the first valve is accumulated above a certain level, the space between the valve body and the valve seat of the second valve is released and the valve opens, and the liquid is vigorously pushed out from the cylinder and ejected to the outside through the nozzle.

[0004] In this case, the valve body of the second valve is always pressed against the valve seat by the elastic force exerted by the spring. When the liquid pressure in the cylinder exceeds the elastic force in a state where the first valve is closed, the second valve opens and the liquid passes through vigorously. When the liquid is ejected from the nozzle and the pressure in the cylinder is released, the elastic force wins over the liquid pressure, and the spring presses the valve body against the valve seat, so that the second valve closes again. A pressure accumulator type sprayer equipped with a trigger can thus vigorously eject the liquid in the cylinder to the outside and is useful.

[0005] As such pressure accumulator type sprayers, for example, several have been developed by the applicant.

[0006] For example, the invention described in Patent Document 1 is a trigger sprayer for drawing up and spraying liquid from a container, which includes a second valve that opens and closes according to the pressure of the liquid, and the second valve comprises a second valve piston and an inverted dome-shaped dome spring for biasing the second valve piston. The invention described in Patent Document 2 is similar. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Patent application No. 2020-219863 [Patent Document 2] Patent application No. 2020-219864 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] In the valve structures described in Patent Documents 1 and 2, even when the trigger is not pulled (initial set state, i.e., the valve is not open), the spring portion presses the valve body against the valve seat, and the second valve is usually closed. In this specification, the pressing force applied to the valve body in the initial set state is referred to as the "initial set pressure." In other words, the spring is always subjected to a load due to a constant initial set pressure even in its initial set state, which causes plastic deformation of the spring. When distortion occurs in the spring due to plastic deformation, the elastic force of the spring itself decreases, causing the valve to tighten loosely, which ultimately leads to improper liquid discharge or leakage.

[0009] The present invention was developed in response to the above-mentioned problems. Specifically, the present invention aims to provide a pressure-accumulating sprayer that eliminates the initial set pressure applied to the spring portion in the initial set state, thereby suppressing plastic deformation of the valve structure (valve body) having the spring portion as much as possible.

Means for Solving the Problem

[0010] As a result of intensive studies, the inventor has found that the above problem can be solved by making the length L1 of the valve structure in the no-load state and the shortest distance L2 between the lower support portion and the upper support portion to which the valve structure is attached satisfy the relationship L1 < L2. The present invention is based on this finding.

[0012] The present invention relates to a pressure accumulator type sprayer X having a cylinder body portion B having a main cylinder portion B1 and a sub-cylinder portion B2, and a cover portion C attached so as to cover the cylinder body portion B. The pressure accumulator type sprayer X is attached to a container J, sucks the liquid in the container J into the main cylinder portion B1 via a first valve FV, applies pressure to the liquid in the main cylinder portion B1, and ejects it from the nozzle portion F via a valve structure A when a certain pressure is exceeded. The valve structure A is mounted between the lower support portion B23 of the sub-cylinder portion B2 and the upper support portion C1 of the cover portion C, and the length L1 of the valve structure A in the no-load state and the shortest distance L2 between the lower support portion B23 and the upper support portion C1 satisfy the relational expression L1 < L2.

[0013] The present invention resides in the pressure accumulator type sprayer X described above, wherein the valve structure A is composed of an inverted dome-shaped spring portion 1 and a valve piston portion 2 hanging down from the spring portion 1, and the valve piston portion 2 is composed of a mandrel portion 21, an outer skirt portion 22 extending downward from the outer periphery of the mandrel portion 21, and an inner skirt portion 23 longer than the outer skirt portion 22.

[0014] The present invention resides in the pressure accumulator type sprayer X described above, wherein the mandrel portion 21 is formed in a cylindrical shape between the spring portion 1 and the outer skirt portion 22.

[0015] The present invention resides in the pressure accumulator type sprayer X described above, wherein a cylindrical projection 1A is formed at the center of the spring portion 1.

[0016] The present invention resides in the accumulator type sprayer X described above, in which a central hole 1B with an upper opening is formed in the valve piston portion 2.

Advantages of the Invention

[0017] In the accumulator type sprayer of the present invention, since the valve structure is mounted so as not to contact at least one of the upper support portion and the lower support portion in the initial set state, the initial set pressure is reduced, and thereby plastic deformation of the valve structure can be suppressed as much as possible.

[0018] In the accumulator type sprayer X of the present invention, the length L1 of the valve structure A in the no-load state and the shortest distance L2 between the lower support portion B23 and the upper support portion C1 to which the valve structure A is mounted satisfy the relationship L1 < L2, so that the pressing force applied to the spring portion 1 in the initial set state in the valve piston portion 2 can be set to zero (that is, the initial set pressure can be set to zero). Therefore, the load applied to the valve structure A in the initial set state is reduced, and plastic deformation can be suppressed as much as possible. Here, the no-load state means a state in which the valve structure A is not pressed in either the valve closing direction or the valve opening direction.

[0019] In the accumulator type sprayer X of the present invention, the spring portion 1 having an inverted dome shape and the valve piston portion 2 hanging from the spring portion 1 are provided, so that the elastic force of the spring portion 1 is evenly applied to the valve piston portion 2. Therefore, the pressing force is transmitted properly, the axis of the valve piston portion 2 is stabilized, and lateral play during vertical movement is prevented.

[0020] In the accumulator type sprayer X of the present invention, since the mandrel portion 21 is formed in a cylindrical shape between the spring portion 1 and the outer skirt portion 22, when the valve structure A moves up and down, there is nothing that contacts the wall surface of the sub-cylinder portion B2, and the valve opening and closing by the valve structure A are smoothly performed without hindering the movement.

[0021] In the accumulator type sprayer X of the present invention, a cylindrical protrusion 1A is formed at the center of the spring portion 1. As a result, when the valve structure A reaches the top dead center, the deformation of the spring portion 1 is suppressed within a certain range, and the load applied to the spring portion 1 can be reduced.

[0022] In the accumulator type sprayer X of the present invention, a central hole 1B with an upper portion being open is formed in the valve piston portion 2, whereby the valve structure A can be lightened. Further, when the valve structure A is pressed, axial bending is prevented. In addition, excessive bending deformation is suppressed, and it is possible to prevent the spring portion 1 from being turned inside out extremely. Therefore, the valve opening and closing by the valve structure A are performed smoothly.

Brief Description of the Drawings

[0023] [Figure 1] FIG. 1 is a longitudinal sectional view showing the accumulator type sprayer according to the present embodiment. [Figure 2] FIG. 2 is a longitudinal sectional view showing an enlarged valve structure in the state of FIG. 1. [Figure 3] FIG. 3 is a longitudinal sectional view showing the accumulator type sprayer in a state where the valve structure has moved upward. [Figure 4] FIG. 4 is a longitudinal sectional view showing an enlarged valve structure in the state of FIG. 3. [Figure 5] FIG. 5 is an explanatory view showing the inner peripheral wall of the sub-cylinder portion. [Figure 6] FIG. 6 is a longitudinal sectional view showing the accumulator type sprayer in a state where the valve structure has reached the top dead center. [Figure 7] FIG. 7 is a longitudinal sectional view showing an enlarged valve structure in the state of FIG. 6.

Embodiments for Carrying Out the Invention

[0024] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings as necessary. In the drawings, identical elements will be denoted by the same reference numeral, and redundant explanations will be omitted. Furthermore, unless otherwise specified, positional relationships such as up, down, left, and right shall be based on the positional relationships shown in the drawings. Furthermore, the dimensional ratios in drawings are not limited to those shown.

[0025] The pressurized sprayer X of the present invention is attached to a container J, and draws the liquid in the container J into the main cylinder section B1 via the first valve FV, applies pressure to the liquid in the main cylinder section B1, and when the liquid pressure exceeds a certain level, it is forcefully ejected from the nozzle section F via the valve structure A.

[0026] Figure 1 is a longitudinal cross-sectional view showing a pressurized sprayer X according to this embodiment. Figure 2 is a longitudinal cross-sectional view showing an enlarged view of the valve structure A in the state shown in Figure 1. The pressurized sprayer X comprises a nozzle section F, a cylinder body section B (having a main cylinder section B1, a sub-cylinder section B2, a first passage section P1, a second passage section P2, and a third passage section P3, etc.), a piston section D, a cover section C, a trigger section E, a first valve FV, a second valve, an introduction pipe H, a trigger return spring I, and a cap section G.

[0027] The cylinder body section B is a part having a passage through which liquid flows, and includes a main cylinder section B1 that receives the piston section D, a first passage section P1 that introduces the liquid in the container J into the main cylinder section B1, a second passage section P2 that introduces the liquid from the main cylinder section B1 to the sub-cylinder section B2 to which the valve structure A is attached, and a third passage section P3 that introduces the liquid from the sub-cylinder section B2 to the nozzle section F.

[0028] The inlet pipe H is cylindrical and fitted to the lower part of the cylinder body B. The inlet pipe H communicates with the main cylinder part B1 via the first passage part P1.

[0029] The main cylinder section B1 is a cylindrical component. A piston section D is inserted into the main cylinder section B1, which slides within the main cylinder section B1 in conjunction with the movement of the trigger section E. A first valve FV is provided between the main cylinder section B1 and the first passage section P1. The first valve FV is a one-way valve that allows liquid to pass from the first passage P1 into the main cylinder B1. The main cylinder section B1 is in communication with the sub-cylinder section B2 via the second passage section P2.

[0030] The sub-cylinder section B2 is formed in a cylindrical shape with an open top. The valve structure A is mounted on the sub-cylinder section B2. Specifically, the bottom of the sub-cylinder section B2 is a lower support section B23 that supports the valve structure A, and the valve structure A is placed on the lower support section B23. As will be described later, the inner wall of the sub-cylinder section B2 functions as a valve seat, and the valve piston section 2 of the valve structure A, more specifically the inner skirt section 23, functions as a valve body, thereby forming a so-called second valve. The nozzle portion F side of the sub-cylinder portion B2 is provided with a vertical groove portion B21 and a through hole B22, which will be described later, and the through hole B22 is in communication with the third passage portion P3.

[0031] Furthermore, a flange is provided at the lower end of the cylinder body B (see Figure 1), and the pressurized sprayer X is fixed to the container J by sandwiching this flange between the upper end of the container J and the cap G.

[0032] The cover portion C is attached so as to cover the entire cylinder body portion B. With the cover portion C attached to the cylinder body portion B, a space is created between the cover portion C and the sub-cylinder portion B2 of the cylinder body portion B, and the valve structure A is installed in this space. The cover portion C is provided with an upper support portion C1 for supporting the valve structure A. This upper support portion C1 is the inner upper wall portion of the cover portion C that supports the outer circumference of the upper end of the spring portion 1.

[0033] Figure 3 is a longitudinal cross-sectional view showing the accumulator-type sprayer X with valve structure A moved upward. Furthermore, Figure 4 is a magnified longitudinal cross-sectional view showing valve structure A in the state shown in Figure 3. As the valve piston 2 moves upward, the spring 1 comes into contact with the upper support C1 as shown in Figure 4. As the valve piston 2 moves further upward, the spring 1 deforms and exerts a pressing force on the valve piston 2. The valve structure A consists of an inverted dome-shaped spring portion 1 and a valve piston portion 2 hanging down from the spring portion 1. Specifically, a cylindrical core rod portion 21 hangs down from approximately the center of the spring portion 1, and an outer skirt portion 22 extending downward is formed continuously around the outer circumference of the core rod portion 21. Furthermore, an inner skirt portion is formed inside the outer skirt portion 22, extending downward and being longer than the outer skirt portion 22. In other words, the core rod portion 21, the outer skirt portion 22, and the inner skirt portion 23 constitute the valve piston portion 2.

[0034] The valve structure A consists of an inverted dome-shaped spring section 1 and a valve piston section 2 hanging down from the spring section 1. This ensures that the elastic force of the spring section 1 is evenly applied to the valve piston section 2. As a result, the pressing force from the spring section 1 is properly transmitted, the axis of the valve piston section 2 is stabilized, and lateral movement during vertical movement is prevented.

[0035] Furthermore, in the pressurized sprayer X, the core rod portion 21 between the spring portion 1 and the outer skirt portion 22 is formed in a cylindrical shape between the spring portion 1 and the outer skirt portion 22. As a result, when the valve structure A moves up and down, there is nothing that comes into contact with the wall surface of the sub-cylinder portion B2, and the valve structure A opens and closes smoothly without hindering its movement.

[0036] Both the outer skirt portion 22 and the inner skirt portion 23 are formed in a tapered shape, with the lower part widening outwards. As will be described later, the outer skirt portion 22 performs a sealing function, and the inner skirt portion 23 functions as a valve body.

[0037] The upper end of the core rod portion 21 is open, and a central hole 1B is formed therein. Furthermore, the area around the released central hole 1B is convex, forming a cylindrical projection 1A. In other words, the central hole 1B and the cylindrical projection 1A are formed approximately in the center of the spring portion 1. As will be described later, the cylindrical projection 1A functions as a stopper for the valve structure A, which functions as a valve body.

[0038] In the accumulator-type sprayer X, the valve piston section 2 has a central hole 1B that is open at the top, which makes it possible to reduce the weight of the valve structure A. Furthermore, when valve structure A is pressed, shaft bending is prevented. Furthermore, excessive deformation is suppressed, and in extreme cases, the spring portion 1 can be prevented from being bent over. Therefore, valve opening and closing by valve structure A can be performed smoothly.

[0039] In the pressurized sprayer X, the valve structure A is mounted on the sub-cylinder section B2. As described above, the sub-cylinder section B2 is cylindrical with an open top, and the outer skirt section 22 and inner skirt section 23 are mounted so as to press against the inner wall of the sub-cylinder section B2. At this time, the valve structure A rests on the lower support section B23 formed at the bottom of the sub-cylinder section B2. Furthermore, the length L1 of the valve structure A in the unloaded state is longer than the wall portion of the sub-cylinder portion B2, and its upper end (i.e., the spring portion 1) is supported by the upper support portion C1 of the cover portion C.

[0040] In this initial setup, the valve structure A is mounted on the sub-cylinder section B2 so as not to come into contact with the upper support section C1. In other words, the length L1 of the valve structure A in the no-load state and the shortest distance L2 between the lower support portion B23 of the sub-cylinder portion B2 and the upper support portion C1 satisfy the relationship L1 < L2 (see FIG. 2). That is, in the initial set state, the valve structure A is mounted on the sub-cylinder portion B2 in a state of not contacting the upper support portion C1. As a result, the initial set pressure in the initial set state becomes zero. Therefore, it becomes possible to reduce the load applied to the spring portion 1, and plastic deformation of the valve structure A can be suppressed.

[0041] The upper support portion C1 of the cover portion C is a portion where the spring portion 1 abuts on the inner wall of the cover portion C. In the cover portion C, a convex stopper portion C2 is provided at a position corresponding to the cylindrical protrusion 1A. The stopper portion C2 is for restricting the upward movement of the valve structure A. When the valve structure A moves upward and the spring portion 1 is pressed and deformed, similarly, the cylindrical protrusion 1A moves upward and abuts on the stopper portion C2, and the movement of the valve structure A stops. Thereby, the valve structure A reaches the top dead center, and it is possible to prevent an excessive load from being applied to the valve structure A and the spring portion 1 from being bent and deformed, and extremely, the spring portion 1 from being turned over.

[0042] Since the valve structure A is uniform in the circumferential direction in a top view, it can abut evenly on the upper support portion C1 of the cover portion C and receive the reaction force evenly.

[0043] The valve structure A is integrally formed with the spring portion 1 and the valve piston portion 2.

[0044] FIG. 5 is an explanatory diagram showing the inner peripheral wall of the sub-cylinder portion B2. On the inner peripheral wall of the sub-cylinder portion B2, a plurality of concave vertical groove portions B21 extending in the vertical direction in all directions are provided at regular intervals. Of these, the bottom of the vertical groove B21 located at the position corresponding to the third passage P3 on the nozzle section F side is provided with a through hole B22 that leads to the third passage P3. The vertical groove B21 at positions other than the one corresponding to the nozzle section F does not have a through hole B22.

[0045] Between the vertical grooves B21, the inner wall functions as a column. As a result, even when pressure is applied to the valve piston 2, the area around the vertical grooves B21 does not deform, and the valve piston 2 slides smoothly.

[0046] The third passage section P3 is provided at a certain distance from the bottom of the sub-cylinder section B2. Specifically, it is provided at a height of 2 to 3 mm from the bottom. As a result, a time lag occurs between the time the trigger unit E is rotated from the initial set state, the time the hydraulic pressure inside the main cylinder unit B1 increases and the valve piston unit 2 begins to move, and the time the inner skirt unit 23 passes through the through hole B22 and the second valve opens. Therefore, even when the trigger part E is rotated, a state of no liquid is ejected (so-called "play") occurs, improving the usability of the pressurized sprayer X.

[0047] Here, we will explain the liquid flow when using the pressurized Sprayer X to eject liquid. The liquid flows through the container J, inlet pipe H, first passage P1, first valve FV, main cylinder B1, second passage P2, sub-cylinder B2, vertical groove B21 (through hole B22), third passage P3, and nozzle F in that order, and is ejected to the outside from nozzle F.

[0048] In the initial setup state (as shown in Figures 1 and 2), the first valve FV and the second valve are closed, and the fluid is filled from the inlet pipe H to the sub-cylinder section B2. Furthermore, the trigger unit E is in a non-rotating state.

[0049] When the trigger part E is rotated, the piston part D moves within the main cylinder part B1 in conjunction with the trigger part E, and the pressure inside the main cylinder part B1 increases (pressure is accumulated). At this time, the main cylinder part B1 and the space below the valve piston part 2 are in communication through the second passage part P2, and the space is filled with liquid.

[0050] When the hydraulic pressure becomes sufficiently high, the valve piston section 2 moves upward as if pushed by the pressure, and the spring section 1 is pressed and deformed (see Figures 3 and 4).

[0051] Figure 6 is a longitudinal cross-sectional view showing the accumulator-type sprayer X with valve structure A at top dead center. Furthermore, Figure 7 is a magnified longitudinal cross-sectional view showing valve structure A in the state shown in Figure 6. Furthermore, as the valve structure A moves upward due to hydraulic pressure, the cylindrical projection 1A comes into contact with the stopper portion C2 as described above, thereby restricting the movement of the valve structure A. As a result, the valve structure A reaches its top dead center, and the deformation of the spring portion 1 is suppressed to a certain range. Consequently, the load on the spring portion 1 is reduced, and bending deformation of the spring portion 1 can be suppressed.

[0052] When the valve piston section 2 rises sufficiently, the through hole B22 in the vertical groove section B21 and the third passage section P3 communicate, and the liquid moves to the nozzle section F. At this time, since the liquid is under pressure, it is forcefully ejected from the nozzle section F to the outside. At this time, the first valve FV is closed.

[0053] As the liquid is ejected, the hydraulic pressure from the main cylinder section B1 to the nozzle section F decreases, and when the resilience of the spring section 1 overcomes this decrease, the valve piston section 2 is pushed down. When the piston portion D is pushed down, the inner skirt portion 23 covers the third passage portion P3, and the second valve closes.

[0054] Furthermore, the trigger section E returns to its initial position due to the spring force of the trigger return spring I. As the trigger unit E returns to its original position, the piston unit D moves within the main cylinder unit B1, creating negative pressure inside the main cylinder unit B1 and causing the first valve FV to open. At this time, since there is a connection from container J to the main cylinder section B1, the liquid is drawn up from container J through the introduction pipe H and the first passage section P1 into the main cylinder section B1 by negative pressure. When the negative pressure in the main cylinder section B1 is relieved by the inflow of liquid, the first valve FV closes, and the movement of liquid stops. At this time, the second valve (valve structure A) is in the closed state, as described above.

[0055] This returns the accumulator-type sprayer X to its initial set state. At this time, both the first valve FV and the second valve are closed, and the fluid is filled from the inlet pipe H to the sub-cylinder section B2.

[0056] Furthermore, PP resin (polypropylene resin) or the like is preferably used as the material for the base body B having the main cylinder section B1 and sub-cylinder section B2 described above. Furthermore, suitable materials for the valve structure A include PP resin or POM resin (polyacetal resin).

[0057] Although preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments.

[0058] In this embodiment, the valve structure A is mounted in an initial set state so as not to contact the lower support portion B23 and not to contact the upper support portion C1, but is not limited to this. The valve structure A may be mounted so as to contact only the upper support portion C1, or so as not to contact either the upper support portion C1 or the lower support portion B23. As a result, no axial load (in the closing or opening direction) is applied to valve structure A in the initial setup state.

[0059] In this embodiment, the spring portion 1 and the valve piston portion 2 in the valve structure A are circular in top view, but are not limited to this, and any suitable shape can be adopted so that the spring portion 1 can press against the valve piston portion 2.

[0060] In this embodiment, the spring portion 1 and the valve piston portion 2 are formed integrally, but they may be provided as separate parts. [Industrial applicability]

[0061] The pressurized sprayer X of the present invention can be widely used when liquid is ejected by opening and closing the first valve FV and the second valve, and by suppressing deformation of the valve structure A, it can maintain its function over a long period of time and provide suitable ejection. [Explanation of Symbols]

[0062] X... Pressurized Sprayer A... Valve structure 1. Spring section 1A...Cylindrical projection 1B...Center hole 2. Valve piston section 21... Core rod part 22. Outer skirt section 23...Inner skirt section B...Cylinder body section B1...Main cylinder section B2... Subcylinder section B21... Vertical groove section B22...Through hole B23...Lower support part C...Cover part C1...Top support part C2... Stopper section D... Piston section E...Trigger section F... Nozzle section G... Cap part H··Introduction pipe I... Trigger return spring J...container FV... First Valve P1...1st passage section P2...Second passage section P3...Third passage section

Claims

1. A pressurized sprayer having a cylinder body portion having a main cylinder portion and a sub-cylinder portion, and a cover portion attached so as to cover the cylinder body portion, The pressurized sprayer is attached to a container, draws the liquid from the container into the main cylinder via a fast valve, applies pressure to the liquid in the main cylinder, and when a certain pressure is exceeded, sprays it out from the nozzle via a valve structure. The valve structure is mounted between the lower support portion of the sub-cylinder and the upper support portion of the cover. The length L1 of the valve structure in an unloaded state and the shortest distance L2 between the lower support portion and the upper support portion are, L1 < L2 A pressurized sprayer that satisfies the relationship equation.

2. The valve structure comprises an inverted dome-shaped spring portion and a valve piston portion hanging down from the spring portion. The valve piston portion comprises a core rod portion, an outer skirt portion extending downward from the outer circumference of the core rod portion, and an inner skirt portion longer than the outer skirt portion, according to claim 1.

3. The pressurized sprayer according to claim 2, wherein the core rod portion is formed in a cylindrical shape between the spring portion and the outer skirt portion.

4. The pressurized sprayer according to claim 2, wherein a cylindrical projection is formed in the center of the spring portion.

5. The accumulative sprayer according to any one of claims 2 to 4, wherein the valve piston portion has a central hole that is open at the top.

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