JP2003190848A - Aerosol spray apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safe aerosol spray apparatus capable of spraying on an objective material at a distant position or at a position difficult to access, and having a compact and simple structure. <P>SOLUTION: This aerosol spray apparatus is composed of an apparatus body 13, perforated to have an inlet hole 14 through which a nozzle stem 12 of an aerosol vessel 11 is inserted to be engaged and a cylinder hole 15 communicating with the inlet hole 14, opened at the tip part and extending in the axial direction, and a piston nozzle 16, held to be slid in the cylinder hole and perforated to have a spray passage extending in the axial direction. The tip side of the cylinder hole is used as a guide part 15c for supporting the piston nozzle so as to slide along the axial direction, a nozzle base part 19 to be slid in the cylinder hole is formed on the rear end surface of the piston nozzle 16 and the piston nozzle is deflected toward the rear end part 15a of the cylinder hole 15 by interposing a coil spring 22 between the nozzle base part and the piston nozzle in the cylinder hole 15. In the piston nozzle rest position, a cylindrical axial directional space 24 where the inlet hole 14 is opened is separately formed between the nozzle base part 19 and the end rear part of the cylinder hole 15. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main body having an inlet hole into which a nozzle stem is fitted and an axially extending cylinder hole communicating with the inlet hole and having a tip portion opened. The present invention relates to an aerosol injection device including a piston nozzle slidably held in a cylinder hole and provided with an injection passage extending in an axial direction.

[0002]

2. Description of the Related Art Aerosol injection devices for spraying pressurized liquid in a spray can directly into a space from a nozzle formed in a push button are widely known and used, but are particularly narrow and reachable. When spraying a chemical solution to a part that does not come close to or that does not want to approach too much, it has been customary to attach an extension nozzle such as a separate elongated hollow tube to the injection port each time. It was target.

However, in this type of aerosol injecting device, the extension nozzle may be lost unless it is always housed integrally with the spray can by some holding means. In addition, there has been a jetting device having a long nozzle jet port from the past, but it is not practical to fabricate a device with a nozzle having a too long size because it becomes an obstacle when the cap is put on and it has not been produced conventionally. Therefore, there has been almost no aerosol container which is capable of accurately spraying a chemical solution or the like on such a difficult place and which is integrally provided with the extension nozzle as described above.

[0004]

The aerosol spraying device seen in the prior art as described above is accompanied by the trouble of separately attaching the extension nozzle to the injection port of the nozzle button at the time of use and does not lose the extension nozzle. , There was a problem that I had to store it in an integrated manner with the spray can at all times. Therefore, an object of the present invention is to provide a compact and simple structure and safe aerosol injection device that can spray an object at a distant position or that is difficult to approach.

[0005]

According to the present invention, the above object is to provide a radial step in the cylinder hole and support the tip end side of the piston nozzle slidably along the axial direction. Forming a guide portion for forming a nozzle base portion that is radially expandable and slidable in the cylinder hole at the rear end portion of the piston nozzle, and has a shaft between the radial step portion and the base portion. Elastic means is provided along the direction, and the piston nozzle is biased toward the rear end of the cylinder hole, and the inlet hole is between the nozzle base and the rear end of the cylinder hole in the rest position. A value that is open in the defined axial space and that is summed by the elastic force of the elastic means and the fluid resistance of the injection passage of the piston nozzle is lower than the final ejection pressure of the aerosol. Must be set to More is achieved.

With such a construction, by using the piston nozzle capable of popping out from the main body having the above-mentioned construction, in place of the separate extension nozzle found in the prior art, it is always housed in the main body and is not used. At the same time, there is no fear of losing it, and at the same time, it does not project greatly to the side of the main body, so a compact outer shape can be obtained, a cap can be attached, and the same outer shape as a normal spray can can be taken.

Furthermore, when in use, the nozzle stem of the aerosol can is pushed down by pressing the upper end of the main body, and the contents of the pressurized gaseous liquid inside the can enter the axial space of the cylinder hole through the inlet hole. Then, the pressure of the contents acts on the rear end surface of the nozzle base, and as a result, the piston nozzle is held by the guide portion against the biasing force of the elastic means, and along the axial direction, the front end side of the cylinder hole. And axially protrudes from the main body, so that the contents are sprayed to the outside through an extended injection passage that penetrates the inside of the piston nozzle.

At this time, the content to be sprayed is once pressurized in the axial space of the cylinder hole against the elasticity of the elastic means, and then the piston nozzle is partially pushed out from the main body, and at the same time, the inner thin through hole is formed. Since it comes out through the nozzle, it is atomized toward the tip of the nozzle with a long flight distance and a strong directivity. This means that objects that are difficult to approach, such as
It is extremely effective for spraying a medicinal solution on a honeycomb, a spoilage material, etc. in a pinpoint state, or when an aerosol component adheres to the surroundings, for example, lacquer coating or spraying an insecticide.

Further, sometimes an accidentally discarded aerosol container is thrown into an incinerator or the like, and as a result, an explosive explosion occurs due to the rapid expansion of the aerosol component remaining in the container heated to a high temperature, which causes an explosion. Recently, serious damage to property has become a problem, and safety consideration must be taken to avoid such a problem.

As a consideration for such a safety problem, according to the present invention, the elastic force of the elastic means and the fluid resistance including the orifice resistance and the flow path resistance of the injection passage of the piston nozzle are added as described above. The resistance value is set to a value lower than the final ejection pressure of the aerosol. That is, the value obtained by summing the fluid resistance when the aerosol passes through the injection passage of the piston nozzle and the elastic resistance in the compression direction of the elastic means means the relationship with the final pressure immediately before the aerosol cannot be ejected. It is needless to say that such a set value must be confirmed by experiments each time it is designed, but the aerosol, which is the gas-liquid mixture contained in the aerosol container, is ejected up to the last drop, and is discarded, for example. Even if the aerosol container is heated, it does not cause a large explosion.

According to a preferred embodiment of the present invention, the elastic means is a coil spring surrounding the piston nozzle. It is easy and cheap to obtain coil springs with various elasticity, and even when mounting with such a configuration, the coil springs are first brought into contact with the radial step of the cylinder hole, and then the piston nozzle is attached to the central portion thereof. Since it is as simple as penetrating, it is extremely easy to assemble.

According to another embodiment of the present invention,
A sealing ring is fitted into the outer peripheral portion of the nozzle base portion, a rear end portion of the cylinder hole is formed by a plug screwed through a sealing washer, and a tip end portion of the plug is along an axial direction. Projecting into the cylinder hole and having a reduced diameter, and further, the distal end portion defines a cylindrical axial space together with the inner peripheral surface of the cylinder hole and the rear end surface of the nozzle base portion. With such a configuration, the assembling of the aerosol injection device can be completed in only three steps. That is, the elastic means is inserted into the cylinder hole in the first step, and the tip portion of the piston nozzle is inserted into the guide portion of the main body in the second step.
The process is completed by screwing the plug into the rear end of the cylinder hole. Due to such a small number of parts and a small number of assembling steps, manufacturing by an automatic assembling machine is extremely easy.

Further, the structure in which the sealing ring is fitted on the outer peripheral portion of the nozzle base prevents the high-pressure aerosol slipping through the nozzle base from leaking out of the main body. Also, with respect to the plug, from the same consideration, it is fitted into the rear end portion of the cylinder hole through a sealing washer.
Furthermore, by defining a cylindrical axial space between the rear end of the cylinder bore and the nozzle base in the rest position, there is no fear that the opening of the inlet bore will be blocked by the outer peripheral surface of the nozzle base. Therefore, a reliable and good starting of the piston nozzle is always ensured.

Furthermore, according to another preferred embodiment of the present invention, the injection passage of the piston nozzle is a substantially tapered hole whose diameter decreases substantially toward the tip. With such a configuration, at least the aerosol will be given a throttling effect, and in consideration of various physical characteristics such as the flow velocity and size of the aerosol particles, straightness and reachability, etc., in a stepwise manner toward the nozzle of the tip or It is preferable to design the taper continuously.

The aerosol injection device according to the present invention will now be described in detail with reference to one embodiment shown in the accompanying drawings.

[0016]

1 is an exploded perspective view of an aerosol injection device according to the present invention, FIG. 2 is a cross-sectional view of the aerosol injection device shown in FIG. 1 at rest, and FIG. 3 is an aerosol shown in FIG. Sectional view of the injection device for use, FIG.
Used in experiments to compare injection quantity and reachability (jet distance), a. During actuation of the piston nozzle of the aerosol injector according to the invention; b. An aerosol injector according to the invention when the piston nozzle is inactive; c. FIG. 5 is a schematic view of a conventional nozzle, FIG. , B. , C. 5 is a chart showing the results of a comparative experiment of FIG.

A typical embodiment of the aerosol injection device according to the present invention will be described below with reference to FIGS.

As shown in FIGS. 1 to 3, the aerosol container 11 is filled with the contents of a pressurized liquid to be sprayed inside, and the aerosol container 11 is upwardly moved from the center of the upper end surface thereof. It is a general spray can consisting of an elongated tube-shaped nozzle stem 12. The aerosol injection device 10 according to the present invention is a main body 1 formed of a stepped cylindrical resin block composed of an elongated large-diameter portion 13a and a small-diameter portion 13b inserted into the tip of a nozzle stem 12.
It consists of three.

A cylinder hole 15 is bored in the main body 13 along the axial direction, and the tip side of the small diameter portion 13b is open. A slender piston nozzle 16 slidably held is fitted in the cylinder hole 15 of the small diameter portion 13a. An injection passage 17 for allowing the aerosol to flow is bored in the piston nozzle 16 along the axial direction. Further, this injection passage also has a stepped structure having a small diameter portion 17a on the front end side and a large diameter portion on the rear end side.

On the other hand, the large-diameter portion 13a has a rear end side which closes the cylinder hole 15 in order to close the sealing washer 2.
It is closed by a plug 18 screwed in via 1. The large diameter portion 13a also has a body 1 on the front end side.
3, an inlet hole 14 which intersects perpendicularly with the longitudinal axis A of the nozzle 3 is provided in the radial direction and opens into a cylinder hole 15, and the inlet hole 14 further has a nozzle stem 12 extending from the aerosol container 11. Is fitted.

The cylinder hole 15 has two holes along the axis A of the main body.
The radial step portions 30a and 30b at the positions are provided in such a manner that the diameter is gradually reduced toward the tip side, that is, substantially tapered, and the tip portion 15c of the piston nozzle 16 is arranged along the axial direction. And a guide portion for slidably supporting it, and the intermediate portion 15b constitutes a spring bearing for the coil spring 22 constituting the elastic means described later together with the tip side step portion 30b. . Further, behind the intermediate portion 15b, a rear portion 15a having the original diameter of the cylinder hole is formed via another step portion 30a.

In the rear portion 15a of the cylinder hole 15, a nozzle base 19 having a radially enlarged diameter is slidably accommodated at the rear end of the piston nozzle 16 and slidably accommodates a radial step portion 30a. A coil spring 22 is provided between the nozzle base 19 and the nozzle base 19 so as to surround the piston nozzle 16 in the axial direction, and the piston nozzle 16 is biased toward the rear end of the cylinder hole 15. A sealing ring 20 is fitted on the outer peripheral portion of the nozzle base portion 19 to ensure the airtightness of a cylindrical axial space 24, which will be described later, in the rest position of the piston nozzle 16 shown in FIG.

Further, as seen in FIG. 2, the inlet hole 1
4 is the nozzle base 19 and the cylinder hole 15 in the rest position.
It opens into a cylindrical axial space 24 defined by the rear end 23. The rear end portion 23 is the front end portion 25 of the plug 18 screwed into the cylinder hole 15.
The front end portion 25 is formed to have a diameter smaller than the diameter of the threaded portion 18a of the plug 18 at the same time as protruding into the rear end portion of the cylinder hole 15. Therefore,
A cylindrical axial space 24 will be defined in the cylinder bore with the rear end face of the nozzle base 19.

In the cylindrical axial space 24, there is no fear that the opening of the inlet hole 14 is blocked by the outer peripheral surface of the nozzle base 19, and the piston nozzle 16 is always assuredly and satisfactorily started. In this embodiment, the plug 18 is attached by being screwed into the cylinder hole 15. However, in order to simplify the assembling process, the plug 18 is attached by a fitting type or a bayonet type. Format is preferred.

Next, a process of assembling the aerosol injection device according to the present invention will be described. As the first step, the coil spring 22 which is an elastic means is inserted into the cylinder hole 15, and as the second step, the tip portion of the piston nozzle 16 is inserted into the tip portion 15c forming the guide portion of the main body, In the third step, the plug 18 is attached to the rear end portion 1 of the cylinder hole 15.
It is completed by screwing into 5a. Since the assembly is performed by such a small number of steps, automatic assembly using a simple machine is easy, and at the same time the number of parts is small, and therefore the manufacturing effect is extremely large.

During use, the nozzle stem 12 of the aerosol can 11 is pushed down by pressing the upper end of the main body 10, and the aerosol inside the aerosol can flows into the axial space 24 of the cylinder hole 15 through the inlet hole 14. Then, the pressure of the aerosol acts on the rear end surface of the nozzle base portion 19, so that the piston nozzle 16 is axially supported while being held by the guide portion 15c against the biasing force of the coil spring 22 which is an elastic means. And slides toward the tip side of the cylinder hole 15, and accordingly, the aerosol is sprayed to the outside through the injection passage 17 penetrating the inside of the piston nozzle.

At this time, the aerosol to be sprayed is vigorously jetted from a position separated by at least the length of the piston nozzle 16 protruding from the main body 10. That is, since the aerosol is once pressurized in the axial space 24 of the cylinder hole against the elasticity of the coil spring 22 and then flows out through the thin injection passage 17 inside the piston nozzle, it is directed toward the tip of the nozzle 16. At the same time as being atomized with a strong directivity, it is possible to obtain rangeability.

What is important here is that the accidentally discarded aerosol container is put into an incinerator or the like and heated to a high temperature.
Recently, it has been regarded as a problem that it causes an explosion due to the rapid expansion of the aerosol component remaining in the container, causing serious harm to surrounding humans or structures. Must be paid.

Therefore, according to the present invention, a fluid composed of the elastic force of the coil spring 22 which is an elastic means, more precisely, the elastic compression force, and the orifice resistance and the flow path resistance at the opening of the injection passage 17 of the piston nozzle 16. The pressure resistance value, which is the sum of the resistances, must be set to a value lower than the final ejection pressure of the aerosol. The "final ejection pressure" here means the pressure immediately before the aerosol cannot be ejected,
It is needless to say that a specific set value must be confirmed by an experiment for each design, but it is substantially achieved by appropriately selecting the spring constant of the coil spring 22.

Next, a comparative experiment example regarding the injection amount and the reachability of the aerosol injected as shown in FIG. 5 between the aerosol injection device according to the present invention shown in FIG. 4 and the conventional injection device. explain.

In FIG. 4, a. Shows schematically an injection device according to the invention when the piston nozzle is activated, b.
Shows a schematic representation of an injection device without actuating the piston nozzle, or simply with a conventional pistol-type injection nozzle, c. FIG. 3 is a schematic view of a normal injection nozzle of a direct injection type called a “cosmos type”.

In FIG. 5, the measurement conditions of the comparative experiment are as follows. The aerosol is a petroleum solvent as the base solvent, the gas is 0.39 MPa, and liquefied propane gas at a temperature of 25 ° C. is mixed by 50%. It was

As a result, a. The injection amount of the injection device for 5 seconds when the piston nozzle is operating is 8.98.
g and the injection distance was 260 cm. An injector according to the invention b. The injection amount when the piston nozzle was not operated was 8.68 g, and the injection distance was 230 cm. a. This value is a. Equivalent to 88.5%. Further, c. The injection amount in a normal injection nozzle is 8.95g, and the injection distance is 2
It was 10 cm. Also this distance is a. When the injection distance is 100%, it corresponds to 80.8%, and it is clear that the injection nozzle according to the present invention in which the piston nozzle is operated has a longer injection distance, and therefore, superior reachability is obtained. was gotten.

The injection passage 17 of the piston nozzle 16
It is conceivable to give the aerosol a squeezing effect by transforming the cross-sectional shape of the aerosol into various shapes such as a completely tapered stepless taper shape, but in addition, in order to increase the injection distance or the desired spot property. There may be variants which are effective for obtaining the above, but these are naturally within the scope of the present invention.

[0035]

The aerosol injection device according to the present invention comprises:
A main body having an inlet hole into which the nozzle stem is fitted and a cylinder hole communicating with the inlet hole and extending in the axial direction and having a front end portion opened, and a body slidably held in the cylinder hole. Also, in an aerosol injection device including a piston nozzle having an injection passage extending in the axial direction, a radial step is provided in the cylinder hole, and the tip end side of the aerosol nozzle can slide along the piston nozzle in the axial direction. A guide portion for supporting the piston nozzle, a nozzle base portion that is radially expanded and slidable in the cylinder hole is formed on a rear end surface of the piston nozzle, and the nozzle base portion is provided between the radial step portion and the base portion. The piston nozzle is biased toward the rear end portion of the cylinder hole, and the inlet hole is between the nozzle base portion and the rear end portion of the cylinder hole in the rest position. Between And the resistance value summed by the elastic force of the elastic means and the fluid resistance of the injection passage of the piston nozzle is greater than the final ejection pressure of the aerosol. Since it has a configuration that is set to a low value, it is possible to provide a compact and simple structure and safe aerosol injection device that can spray an object at a distant position or that is difficult to approach. The effect is said to be possible.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an aerosol injection device according to the present invention.

FIG. 2 is a sectional view of the aerosol injection device shown in FIG. 1 at rest.

FIG. 3 is a cross-sectional view of the aerosol injection device shown in FIG. 1 when in use.

FIG. 4 was used in an experiment to compare injection distance and injection amount, a. 1 is a schematic view of an aerosol injector according to the present invention when a piston nozzle is activated. b. 1 is a schematic view of an aerosol injection device according to the present invention when the piston nozzle is inactive. c. 1 is a schematic diagram of a conventional nozzle.

5 shows the nozzle a. Shown in FIG. , B. , C. 5 is a chart showing the results of comparative experiments regarding the injection amount and the reachability of the.

[Explanation of symbols]

10 Aerosol injection device 11 Aerosol container 12 nozzle stem 13 body 14 entrance holes 15 Cylinder hole 15c Guide part (tip part) 16 piston nozzle 17 Injection passage 18 plugs 19 nozzle base 20 sealing ring 21 Sealed washers 22 Elastic means (coil spring) 23 Rear end (of cylinder hole) 24 axial space 25 Tip (of plug) 30a radial step 30b radial step

Claims (4)

[Claims] 1. A main body having an inlet hole into which a nozzle stem is fitted and a cylinder hole communicating with the inlet hole and extending in the axial direction and having a tip end opened, and a body sliding in the cylinder hole. An aerosol injection device comprising a piston nozzle that is held so as to be capable of axially extending an injection passage, and a radial step portion is provided in the cylinder hole, and the tip end side of the piston nozzle is in the axial direction. A guide portion for slidably supporting along the nozzle, a nozzle base portion that is radially expandable and slidable in the cylinder hole is formed on the rear end surface of the piston nozzle, and the radial step portion Elastic means is interposed between the base portion and the base portion, and the piston nozzle is biased toward the rear end portion of the cylinder hole, and the inlet hole is in the rest position. The opening is in an axial space defined by the rear end portion, and the resistance value summed by the elastic force of the elastic means and the fluid resistance of the injection passage of the piston nozzle is An aerosol injection device characterized by being set to a value lower than the final ejection pressure. 2. The aerosol injection device according to claim 1, wherein the elastic means is a coil spring surrounding the piston nozzle. 3. The nozzle base has a sealing ring fitted in an outer peripheral portion thereof, and a rear end of the cylinder hole is formed by a plug screwed through a sealing washer, and a front end of the plug. Projecting in the cylinder hole along the axial direction and having a reduced diameter, and further, the tip portion defines the cylindrical axial space together with the inner peripheral surface of the cylinder hole and the rear end surface of the nozzle base. The aerosol injection device according to claim 1 or 2, wherein 4. The aerosol injection according to claim 1, wherein the injection passage of the piston nozzle is a substantially tapered hole whose diameter decreases toward the tip. apparatus.