WO2023145977A1

WO2023145977A1 - Constant volume ejection mechanism, and aerosol product equipped with said constant volume ejection mechanism

Info

Publication number: WO2023145977A1
Application number: PCT/JP2023/003651
Authority: WO
Inventors: 博史菅野; 彰太吽野
Original assignee: 株式会社三谷バルブ
Priority date: 2022-01-28
Filing date: 2023-02-03
Publication date: 2023-08-03
Also published as: JP2023129760A

Abstract

Provided is a constant volume ejection mechanism in which a constant volume chamber is provided between a stem and external space region of an aerosol container which uses a compressed gas, wherein after-draw, in which contents leak from an ejection port after ejection, can be reliably prevented.　An intermediate valve (9b, 9c, 13a) between an upstream pressurization chamber A and a downstream constant volume chamber B, which are formed by dividing the inside of a tank 8 with a piston 11, is provided with a cylindrical part 9c that fits to the outer circumference of an upward projection 13a, so as to prevent the intermediate valve from entering an open state immediately after the release of a push-down operation of an operation button 5. Further, a shaft 14 of a downstream valve (14a, 14b, 14c, 16) between the constant volume chamber B and the external space region is configured to directly enter a closed state due to a reduction in passing flow power by a returning force of a shaft spring 15 or a shaft gasket 16, and this closed state is reliably ensured by a step portion 14c. Due to the above configurations, the downstream valve is put into a closed state in advance by the movement of the contents for subsequent ejection from the pressurization chamber A to the fixed volume chamber B, and the contents are thus prevented from leaking out from an ejection port of a nozzle chip 6.

Description

Fixed-quantity injection mechanism and aerosol products equipped with this fixed-quantity injection mechanism

The present invention relates to a fixed quantity injection mechanism for an aerosol type product that uses compressed gas.

In particular, a metering chamber for injecting the content is formed between the stem-side member of the aerosol container and the operating-side member that moves relative thereto, and the piston provided in this metering chamber is moved by the action of the compressed gas inside the container. A constant injection mechanism that is driven by the inflowing contents to reduce its volume (quantitative chamber volume) so that the contents stored in the quantitative chamber at the end of the previous constant injection are injected into the external space area. Regarding.

That is, a metering chamber is formed between the stem output part and the operation part, and for aerosol products using compressed gas, the metering chamber is a fixed amount injection mechanism in which the contents of are injected into an external space area.

Then, when the piston has moved to its final position (for example, the uppermost position) and has completed the original continuous injection of the contents, the space between the metering chamber area and the contents passage area on the injection port side is closed, and the injection operation is performed. The target is a constant injection mechanism equipped with a function (after-draw prevention function) that prevents "after-draw" in which the contents leak into the external space area when the container is not closed.

In this specification, for the sake of simple explanation, the longitudinal direction of the stem, i.e., the up-down direction in each figure is referred to as "up" or "down", and the direction in which the contents are injected into the external space, i.e., the left direction in each figure. It says "before".

The applicant of the present application has already proposed a metered injection mechanism that forms a metered chamber between the stem output portion and the operation portion (see Patent Document 1). Among them, a constant injection mechanism having an afterdraw prevention function is also disclosed (see FIGS. 6 and 7 of Patent Document 1).

The alphanumeric characters with [ ] used in the following description indicate the reference numerals in Patent Document 1.

In the after-draw prevention function of this fixed quantity injection mechanism, the fixed quantity chamber [A'] is separated from the external space region when injection is not performed by the valve action of the valve member [15] and the hole [13b] that is opened and closed by the valve member [15]. It is blocked to prevent leakage of contents.

This valve action causes the piston [14] to move upward due to the pressure of the contents flowing from the container into the pressurizing chamber [B'] due to the injection operation, thereby compressing the metering chamber [A'] and accommodating it therein. The valve member [15] is moved upward by the pressure of the content that has been held, and becomes an "open state" in which the content can flow into the hole [13b].

In addition, during the process of relative movement between the push button [4] and the top plate member [12] just before returning from the injection operation and shifting to the stationary mode, the valve member [15] is moved with respect to the hole [13b]. It is relatively lowered and becomes an “open state” in which the contents cannot flow into the hole [13b].

Japanese Patent Application Laid-Open No. 2007-326647

In addition, since the valve for afterdraw prevention is closed immediately before shifting to the stationary mode by the return operation after the injection operation is cancelled, '] could escape through the still open valve (hole [13b]) into the external space area.

In addition, the movement of the content from the pressurization chamber [B'] to the quantitative chamber [A'] is restricted by the contact between the valve action part [13c] and the upper opening of the inner upper cylindrical part [11b]. Therefore, if the button-side base [13] and the stem-side base [11] move relative to each other even slightly from the contact state, the closing will be released. could not afford to close [13b].

In the present invention, the downstream valve that closes the passage to the injection port to prevent afterdraw is closed before the movement of the contained contents to be injected next time when returning from the injection operation to prevent afterdraw. The purpose is to ensure that

The present invention solves the above problems as follows.
(1) A stem for actuating an upstream valve (e.g., a stem 3 described later) provided in an aerosol container using compressed gas (e.g., an aerosol container 1 described later) and a stem holder (for example, a stem holder integral with this through which the contents to be injected pass) For example, a stem holder 13), which will be described later,
A tank (for example, a tank which will be described later) is engaged with the outer periphery of the stem holder in a fluid-tight slidable state in the release movement direction of the stem, and the inside communicates with the cylindrical end through the upstream passage of the stem holder. tank 8) of
an operation unit (for example, an operation button 5 described later) for moving the tank by a user's operation;
The inside of the tank is partitioned into an upstream pressure chamber (for example, an upstream storage area A to be described later) and a downstream metering chamber (for example, a downstream storage area B to be described later) so as to be liquid-tight and slidable. a piston (for example, a piston 11 to be described later) that is provided and biased toward the pressurizing chamber;
In the fixed quantity injection mechanism consisting of
An intermediate valve (for example, an annular stepped portion 9b, a cylindrical valve, etc., which will be described later) that shuts off the communication between the pressurizing chamber and the metering chamber is closed when the tank comes into contact with the stem holder substantially in the discharge movement direction of the stem. shaped portion 9c, upward convex portion 13a),
and,
Provided on the metering chamber side of the tank, the intermediate valve is shifted from the closed state to the open state by transition to the closed state, the metering chamber is communicated with the external space region, and the transition to the closed state is made at least by reducing the passing flow force. provided with a downstream valve (for example, an upper horizontal hole 14a, a lower horizontal hole 14b, a stepped portion 14c, a shaft gasket 16, which will be described later),
A configuration mode is used.
(2) In (1) above,
When the operation unit is operated from the stationary mode to the injection mode,
the tank moves relative to the stem holder in the release movement direction of the stem to close the intermediate valve;
communication between the pressurization chamber and the quantification chamber is cut off;
the downstream valve opens and communicates the metering chamber with the external space;
the tank abuts against the stem holder and the stem integrated therewith moves in the release movement direction to open the upstream valve;
the content of the aerosol container flows into the pressurization chamber through the passage of the stem holder, and the piston moves toward the metering chamber;
As a result, the contents contained in the fixed volume chamber whose volume is reduced are injected into the external space area through the downstream valve,
When the operation unit is operated from the injection mode to the stationary mode after the volume of the metering chamber is minimized and the injection of the content is completed,
said stem moving in a direction opposite to the direction of discharge movement to close said upstream valve;
the downstream valve is closed when the tank is moved with respect to the stem holder in a direction opposite to the discharge movement direction of the stem and the abutment is released;
Further, the tank is moved and the intermediate valve is opened,
The pressurizing chamber and the quantitative chamber are communicated to move the contents of the pressurizing chamber to the quantitative chamber.
A configuration mode is used.
(3) In (1) and (2) above,
The intermediate valve is
an intermediate valve body (for example, an upward protrusion 13a to be described later) that is provided on the stem holder and is composed of a tapered surface and a cylindrical surface that continues to the outer periphery thereof;
An annular stepped portion (for example, an annular stepped portion 9b described later) in which the tapered surface abuts the inner periphery, and a cylindrical hanging portion (for example, a cylindrical portion described later) that is slidably and liquid-tightly fitted to the outer peripheral surface of the cylindrical surface. 9c) and an intermediate valve seat provided on the tank side having
A configuration mode is used.
(4) In the above (1) to (3),
The valve body of the downstream valve (for example, the shaft 14 described later) is
abuttable against the stem holder and biased to that side;
A configuration mode is used.
(5) In (1) to (4) above,
The valve seat of the downstream valve is
It consists of an annular gasket (for example, a shaft gasket 16 described later) provided on the tank side,
The valve body of the downstream valve (for example, the shaft 14 described later) is
A downstream valve annular stepped portion (for example, a stepped portion 14c described later) held on the inner peripheral surface of the annular gasket and in contact with the content outflow side flat surface of the annular gasket, and in contact with the opposite side of the content outflow side flat surface A downstream valve tapered surface (for example, a shaft tapered surface 14d described later) and a communication hole provided in an annular recess between the downstream valve annular stepped portion and the downstream valve tapered surface and closed by the inner peripheral surface (for example, a shaft tapered surface 14d described later). with an upper lateral hole 14a) of
A configuration mode is used.

The object of the present invention is a fixed quantity injection mechanism having such a configuration and an aerosol type product using compressed gas equipped with the fixed quantity injection mechanism.

By adopting the above configuration, the present invention can ensure after-draw prevention.

FIG. 4 is an explanatory diagram showing a stationary mode of the fixed quantity injection mechanism; FIG. 2 is an explanatory diagram showing an injection mode of the fixed quantity injection mechanism of FIG. 1; FIG. 2 is an explanatory diagram showing an upstream valve closing mode of the constant injection mechanism of FIG. 1; FIG. 2 is an explanatory diagram showing a downstream valve closing mode of the fixed quantity injection mechanism of FIG. 1; FIG. 2 is an explanatory diagram showing an intermediate valve open mode of the fixed quantity injection mechanism of FIG. 1;

A mode for carrying out the present invention will be described with reference to FIGS. 1 to 5. FIG.

It should be noted that, in principle, components with alphabetical reference numerals (for example, cylindrical hanging portion 5a) are part of the components with numerals of the reference numerals (eg, operation buttons 5).

Here, in FIGS. 1 to 5,
1 is an aerosol container containing a content to be injected and a compressed gas as a propellant that pressurizes the content and releases it from a stem 3, which will be described later;
2 is a mounting cup attached to the upper opening of the aerosol container 1 together with a gasket;
A cylindrical stem (upstream valve) 3 is provided in a manner penetrating the central opening of the mounting cup 2 and discharges the contents of the aerosol container 1 from the upper end hole when pushed down.
A cylindrical shoulder cover 4 is engaged and fixed to the outer peripheral surface of the mounting cup 2 and guides an operation button 5, which will be described later, in the vertical direction by a vertical rib-shaped portion provided on the inner surface.
Reference numeral 5 denotes an operation button on the top surface of which the user pushes down, and an operation button for housing a tank 8 to be described later.
5a is formed on the lower surface of the operation button 5, the outer circumference is fitted to the upper inner surface of the inner cylindrical portion of the tank body 9 described later, and the inside communicates with the back surface of the nozzle tip 6 described later.
6 is a cap-like nozzle tip provided on the side surface of the operation button 5, and ejects the contents that have passed through the interior of the cylindrical hanging portion 5a from the central hole on the front to the outer space;
7 is a cylindrical core disposed inside the nozzle tip 6 to set a detour flow path for the contents on its outer periphery;
Reference numeral 8 is engaged with the inside of the lower side of the operation button 5, and is composed of a tank main body 9 and a tank lid 10 which will be described later.
Reference numeral 9 denotes a tank body comprising an annular top plate and an outer cylindrical portion and an inner cylindrical portion hanging down from the inner and outer circumferences of the top plate, which constitutes the upper side of the tank;
A lateral hole 9a is formed on the upper side of the inner cylindrical portion of the tank body 9 and communicates the inside and the outside of the inner cylindrical portion.
9b is an annular stepped portion (intermediate valve) provided at the lower end of the inner cylindrical portion of the tank body 9 and serving as the valve seat of the needle valve;
9c is a cylindrical portion (intermediate valve) that hangs down from the outer circumference of the annular stepped portion 9b;
10 is an annular tank lid fitted to the lower end of the outer cylindrical portion of the tank body 9;
Reference numeral 11 denotes an annular piston that vertically slides between the outer cylindrical portion and the inner cylindrical portion of the tank body 9 in a sealed state;
Reference numeral 12 denotes a piston spring provided between the annular top plate of the tank body 9 and the piston 11 to bias the piston 11 downward;
A stem holder 13 is a stem-side member that engages with the central cylindrical portion of the tank lid 10 so as to be vertically slidable in a sealed state, and whose lower end is fitted to the stem.
13a is provided on the upper side of the stem holder 13, and consists of a horizontal top surface, an upward tapered surface, and an outer peripheral surface.
13b is an upstream communication hole that communicates between the stem 3 and the outer peripheral surface of the upward protrusion 13a;
Reference numeral 14 denotes a sheath-like shaft with a lower opening that is accommodated in the inner cylindrical portion of the tank body 9;
14a is provided so as to communicate the inside and outside of the shaft 14, and is an upper horizontal hole (downstream valve) through which the contents to be injected from the upper side of the tank to the external space area in the injection mode;
14b is provided so as to communicate the inside and outside of the shaft 14, and the content moves vertically in the tank during the intermediate valve opening mode of the return operation, and the content is injected from the upper side of the tank into the external space region in the injection mode. Lower horizontal hole through which
14c is provided on the upper outer peripheral surface of the upper lateral hole 14a, and is a downward stepped portion that abuts on a shaft gasket 16, which will be described later, in a mode other than the injection mode.
14d is an upward shaft tapered surface provided between the upper horizontal hole 14a and the lower horizontal hole 14b;
A shaft spring 15 is provided between the operation button 5 and the upper end of the shaft 14 so as to be housed inside the cylindrical hanging portion 5a, and biases the shaft 14 downward.
Reference numeral 16 denotes an annular shaft gasket (downstream valve) whose outer periphery is sandwiched between the operation button 5 and the upper tank 8, and through which the shaft 14 passes through the central hole;
A is an area below the piston 11 inside the tank 8, which is an upstream accommodation area (pressurization chamber) that accommodates the contents flowing from the stem 3 in the injection mode and urges the piston 11 upward;
B is an area above the piston 11 inside the tank 8, which is a downstream storage area (quantitative chamber) that stores the contents from the upstream storage area A in the intermediate valve opening mode of the return operation;
are shown respectively.

Here, the stem 3, shoulder cover 4, operation button 5, nozzle tip 6, core 7 tank 8 (tank main body 9 + tank lid 10), piston 11, stem holder 13 and shaft 14 are made of polypropylene, polyethylene, polyacetal, or nylon, for example. , polybutylene terephthalate, etc.

The aerosol container 1, the piston spring 12 and the shaft spring 15 are made of plastic or metal, the mounting cup 2 is made of metal, and the shaft gasket 16 is made of elastomer or rubber. be.

At the bottom center of the mounting cup 2, a stem gasket that constitutes an upstream valve together with the stem 3, a stem spring that urges the stem 3 upward to keep the upstream valve closed, and the lower end of the stem 3 and these are mounted. A holding housing is provided (not shown).

In addition, the return force of the shaft spring 15 to the stationary mode is set sufficiently weaker than the return force of the stem 3 to the closed state.

Fig. 1 shows a stationary mode in which the operation button 5 is not pressed.

At this time, the stem 3 (upstream valve) is in a closed state positioned upward, and the downstream valve is in a closed state in which the shaft 14 is lowered and the upper lateral hole 14a is closed by the shaft gasket 16.

Then, the piston 11 is positioned at the lowest end, the volume of the upstream storage area A is minimized, and the contents of the previous operation are stored in the downstream storage area B.

When the container is unused and air is stored in the downstream storage area B, once the injection operation is performed, the air is injected into the external space area and the contents from the container are stored.

FIG. 2 shows the injection state (injection mode) of the contents when the operation button 5 is pressed from the state shown in FIG.

When the operation button 5 is pushed down from the stationary mode of FIG. 1, the lower end of the shaft 14 comes into contact with the stem holder 13, and then the operation button 5 and the tank 8 integrated therewith move downward, and the upper side is moved horizontally. The hole 14a is opened.
Then, the upper end tapered surface of the upward protrusion 13a and the inner circumference of the annular stepped portion 9b come into contact with each other to close the intermediate valve.
Due to this abutment, the stem holder 13 is integrated with the operation button 5 and the tank 8 together with the stem 3 and moves downward, the stem 3 (upstream valve) is opened, and the contents of the container flow upward from the cylindrical interior of the stem 3. leak.

The contents from the stem 3 flow into the upstream housing area A through the stem holder 13, and the pressure pushes the piston 11 up against the piston spring 12.

The piston 11 is pushed up to reduce the downstream storage area B, and the contents stored therein are the horizontal hole 9a, the lower horizontal hole 14b, the internal passage of the shaft 14, the upper horizontal hole 14a, and the nozzle tip 6. It is injected into the external space area through the gap of the core 7 and the injection port at the center of the front surface of the nozzle tip 6 in this order.

Since the intermediate valve is in a state where the inner periphery of the annular stepped portion 9b and the tapered surface of the upward projection 13a strongly abut against each other, the strong pressure of the contents discharged from the stem 3 can be cut off.

The piston 11 moves upward until it abuts on the upper end of the tank 8, and when the volume of the downstream storage area B becomes minimum, the injection of the contents ends (quantitative injection).

It should be noted that the shaft 14 may separate from the stem holder 13 and move upward due to the pressure of the content that is about to flow out from below the shaft gasket 16 .

FIG. 3 shows the upstream valve closing mode, which is the initial stage of the return operation in which the depression of the operation button 5 is released from the state in which the injection of the contents has ended.

When the operation button 5 is gradually released, the operation button 5, the tank 8, the piston 11, the stem holder 13, the shaft 14, etc. move upward together with the stem 3, and the stem 3 (upstream valve) is closed. becomes.

FIG. 4 shows the downstream valve closing mode, which is the intermediate stage of the return operation in which the depression of the operation button 5 is further released from the state of FIG.

When the depression is further released, the operation button 5 and the tank 8 move upward with respect to the stem 3, the stem holder 13, and the shaft 14 in contact with them.

This is because the contents of the upstream storage area A pressurized by the piston 11 urged by the piston spring 12 pushes the stem holder 13 downward relative to the tank lid 10, and the shaft spring 15 and shaft gasket This is because the restoring force of 16 pushes down the shaft 14 that contacts the stem holder 13 .

At this time, the shaft gasket 16 pushes down the shaft 14 by the restoring force to the flat plate state and the contracting force of the central hole portion widened by the shaft tapered surface 14d.

Since the shaft spring 15 also urges the shaft 14 downward, the shaft 14 moves relative to the shaft gasket 16 without delay, and the inner peripheral surface of the shaft gasket 16 is formed between the stepped portion 14c and the shaft tapered surface 14d. The upper lateral hole 14a is securely closed by fitting into the annular recess formed therebetween.

In this manner, the stepped portion 14c closely contacts and positions the upper surface of the shaft gasket 16, so that the inner peripheral surface of the shaft gasket 16 closes the upper horizontal hole 14a without deviation and increases the area of close contact, thereby increasing the content. Reliably block the passage of objects.

Although the horizontal hole portion 9a is separated from the tapered surface of the upward convex portion 13a, the cylindrical portion 9c remains liquid-tightly fitted to the outer peripheral surface of the upward convex portion 13a, and the intermediate valve remains closed. is.

At this time, since the upstream valve by the stem 3 has shifted to the closed state, the intermediate valve does not receive a strong pressure of the contents from the container, and the biasing force of the piston spring 12 pushes the piston 11 into the upstream housing area A. It is only subject to the weak pressure generated on the contents of the

In addition, the period during which the intermediate valve resists this weak pressure is only the middle stage of the return operation and is not permanent. The closed state can be sufficiently ensured even by fitting.

In this way, the closed state of the intermediate valve is set not only to the contact state between the horizontal hole portion 9a constituting the needle valve and the tapered surface of the upward convex portion 13a, but also to the state in which they are somewhat separated from each other (substantially contact state). be able to.

As a result, until the upper horizontal hole 14a (downstream valve) that communicates the downstream storage area B and the external space area is reliably closed, the intermediate valve is kept closed, and the flow from the upstream storage area A to the downstream storage area is closed. Afterdraw is prevented because it blocks the contents into area B.

FIG. 5 shows the intermediate valve open mode, which is the final stage of the return operation in which the depression of the operation button 5 is further released from the state of FIG.

When the operation button 5 is released from the state shown in FIG. 4, the operation button 5, the tank 8, the shaft 14, etc. move upward with respect to the stem 3 and the stem holder 13, and the upper horizontal hole 14a is securely closed. becomes.

At this time, the cylindrical portion 9c is separated from the outer peripheral surface of the upward convex portion 13a and the intermediate valve is opened, so that the upstream accommodation area A and the downstream accommodation area B are communicated with each other. The contents are pushed out by the piston 11, which is moved downward by the restoring force of the piston spring 12, and flow into the downstream storage area B through the intermediate valve, the lower lateral hole 14b, and the lateral hole portion 9a in this order.

Then, when the piston 11 comes into contact with the tank lid 10 and the upstream storage area A reaches the minimum volume state, the stationary mode shown in FIG. 1 is entered.

The contents of the downstream storage area B that flowed in at this time will be the object of injection in the next operation.

Of course, the present invention is not limited to the above embodiments,
(11) integrating the operation button 5 and the tank body 9;
(12) The inner tubular portion of the tank body 9 is provided on the tank lid 10 side,
(13) The diameter of the stem holder 13 is increased and the tank lid 10 is omitted.
(14) integrally molding the piston 11 and the piston spring 12;
(15) integrally molding the shaft 14 and the shaft spring 15;
(16) integrally molding the tank lid 10 and the stem holder 13 via the diaphragm;
You may do so.

Aerosol-type products to which the present invention can be applied include cleansing agents, cleaning agents, cooling agents, muscle anti-inflammatory agents, hair restorers, hair dyes, hair styling agents, hair treatment agents, sunscreens, lotions, cleansing agents, and anti-inflammatory agents. Perspirants, cosmetics, shaving foam, food, droplets (vitamins, etc.), pharmaceuticals, quasi-drugs, gardening agents, insecticides, pest repellents, animal repellents, deodorants, laundry glue, fire extinguishers There are various uses such as containers, paints, adhesives, lubricants, and urethane foams.

Various forms such as liquid, cream, and gel are used as the contents contained in the aerosol container. Components to be blended into the contents include, for example, powders, oil components, alcohols, surfactants, polymer compounds, active ingredients suitable for each application, and water.

As powdery materials, metal salt powders, inorganic powders, resin powders, etc. are used. For example, talc, kaolin, aluminum hydroxychloride (aluminum salt), calcium alginate, gold powder, silver powder, mica, carbonate, magnesium chloride, silica, zinc oxide, titanium oxide, zeolite, nylon powder, barium sulfate, cellulose, mixtures thereof and so on.

Oil components include silicone oils such as dimethylpolysiloxane, ester oils such as isopropyl myristate, oils such as palm oil, eucalyptus oil, camellia oil, olive oil, and jojoba oil, hydrocarbon oils such as liquid paraffin, myristic acid, and palmitic acid. Fatty acids such as acid, stearic acid, linoleic acid and linolenic acid are used.

As alcohols, monohydric lower alcohols such as ethanol, monohydric higher alcohols such as lauryl alcohol and cetanol, and polyhydric alcohols such as ethylene glycol, 1,3-butylene glycol and glycerin are used.

Examples of surfactants include anionic surfactants such as sodium lauryl sulfate, nonionic surfactants such as polyoxyethylene alkyl ethers and polyglycerin fatty acid esters, amphoteric surfactants such as betaine lauryldimethylaminoacetate, and alkyl chlorides. A cationic surfactant such as trimethylammonium is used.

　Hydroxyethyl cellulose, methyl cellulose, gelatin, starch, casein, xanthan gum, carboxyvinyl polymer, etc. are used as polymer compounds.

Active ingredients for each application include dyes such as paraphenylenediamine and aminophenol, oxidizing agents such as hydrogen peroxide, setting agents such as acrylic resins and waxes, and ultraviolet rays such as 2-ethylhexyl paramethoxycinnamate. Absorbents, vitamins such as retinol and dl-α-tocopherol, moisturizers such as hyaluronic acid, anti-inflammatory analgesics such as methyl salicylate and indomethacin, disinfectants such as sodium benzoate and cresol, pests such as pyrethroids and diethyltoluamide Repellents, antiperspirants such as zinc paraphenolsulfonate, cooling agents such as camphor and menthol, anti-asthmatic agents such as ephedrine and adrenaline, sweeteners such as sucralose and aspartame, adhesives and paints such as epoxy resins and urethane, Dyes such as paraphenylenediamine and aminophenol, oxidizing agents such as hydrogen peroxide, and extinguishing agents such as ammonium dihydrogen phosphate and sodium/potassium hydrogen carbonate are used.

Furthermore, suspending agents, emulsifiers, antioxidants, sequestering agents, etc. other than the above contents can also be used.

Compressed gases such as carbon dioxide, nitrogen gas, compressed air, nitrous oxide, oxygen gas, noble gases, and mixed gases of these are used as the contents injection gas for aerosol products.

1: Aerosol container 2: Mounting cup 3: Stem (upstream valve)
4: Shoulder cover 5: Operation button 5a: Cylindrical hanging part 6: Nozzle tip 7: Core 8: Tank 9: Tank main body 9a: Horizontal hole part 9b: Annular stepped part (intermediate valve)
9c: Cylindrical part (intermediate valve)
10: Tank lid 11: Piston 12: Piston spring 13: Stem holder 13a: Upward projection (intermediate valve)
13b: Upstream communication hole 14: Shaft 14a: Upper horizontal hole (downstream valve)
14b: lower horizontal hole 14c: stepped portion (downstream valve)
14d: Shaft tapered surface (downstream valve)
15: Shaft spring 16: Shaft gasket (downstream valve)
A: Upstream storage area (pressurization chamber)
B: Downstream storage area (quantitative chamber)

Claims

a stem for upstream valve actuation provided in an aerosol container using compressed gas and a stem holder through which the contents to be sprayed pass integrally with the stem;
a tank that engages the outer circumference of the stem holder in a liquid-tight slidable state in the release movement direction of the stem, and the inside of which communicates with the cylindrical end through the upstream passage of the stem holder;
an operation unit for moving the tank by a user's operation;
a piston that is slidably provided in a liquid-tight manner so as to divide the inside of the tank into an upstream pressurization chamber and a downstream metering chamber, and that is urged toward the pressurization chamber;
In the fixed quantity injection mechanism consisting of
an intermediate valve that closes when the tank comes into contact with the stem holder in a direction in which the stem moves to release the stem, thereby blocking communication between the pressurizing chamber and the metering chamber;
and,
Provided on the metering chamber side of the tank, the intermediate valve is shifted from the closed state to the open state by transition to the closed state, the metering chamber is communicated with the external space region, and the transition to the closed state is made at least by reducing the passing flow force. with a downstream valve that
A constant injection mechanism characterized by:
When the operation unit is operated from the stationary mode to the injection mode,
the tank moves relative to the stem holder in the release movement direction of the stem to close the intermediate valve;
communication between the pressurization chamber and the quantification chamber is cut off;
the downstream valve opens and communicates the metering chamber with the external space;
the tank abuts against the stem holder and the stem integrated therewith moves in the release movement direction to open the upstream valve;
the content of the aerosol container flows into the pressurization chamber through the passage of the stem holder, and the piston moves toward the metering chamber;
As a result, the contents contained in the fixed volume chamber whose volume is reduced are injected into the external space area through the downstream valve,
When the operation unit is operated from the injection mode to the stationary mode after the volume of the metering chamber is minimized and the injection of the content is completed,
said stem moving in a direction opposite to the direction of discharge movement to close said upstream valve;
the downstream valve is closed when the tank is moved with respect to the stem holder in a direction opposite to the discharge movement direction of the stem and the abutment is released;
Further, the tank is moved and the intermediate valve is opened,
The pressurizing chamber and the quantitative chamber are communicated to move the contents of the pressurizing chamber to the quantitative chamber.
2. A constant injection mechanism according to claim 1, characterized in that:
The intermediate valve is
an intermediate valve body provided on the stem holder and comprising a tapered surface and a cylindrical surface continuing to the outer periphery thereof;
An intermediate valve seat provided on the side of the tank, which has an annular stepped portion with which the tapered surface abuts against the inner periphery and a tubular hanging portion that is slidably and liquid-tightly fitted to the outer peripheral surface of the cylindrical surface. rice field,
3. A constant injection mechanism according to claim 1 or 2, characterized in that:
The valve body of the downstream valve is
abuttable against the stem holder and biased to that side;
4. The fixed quantity injection mechanism according to any one of claims 1 to 3, characterized in that:
The valve seat of the downstream valve is
It consists of an annular gasket provided on the tank side,
The valve body of the downstream valve is
a downstream valve annular stepped portion held on the inner peripheral surface of the annular gasket and in contact with the content outflow side flat surface of the annular gasket; a downstream valve tapered surface in contact with the opposite side of the content outflow side flat surface; a communication hole provided in an annular recess between the valve annular stepped portion and the downstream valve tapered surface and closed by the inner peripheral surface,
5. The fixed quantity injection mechanism according to any one of claims 1 to 4, characterized in that:
Equipped with the fixed quantity injection mechanism according to any one of claims 1 to 5, and containing a compressed gas for injection and contents,
An aerosol product characterized by: