JPS5951861B2 - aerosol spray - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an aerosol spray using a liquefied gas such as fluorocarbon gas or LPG (liquefied petroleum gas) as a propellant, and particularly relates to an aerosol spray in which the amount of liquefied gas used is significantly reduced. .

In conventional aerosol sprays, liquefied gases such as fluorocarbon gas and LPG are mixed with raw materials and filled into an aerosol can. This liquefied gas vaporizes inside the can, and its vapor pressure not only acts as a hook to extrude the chemical solution, but also acts as a solvent for the chemical solution. It also has the function of fragmenting water in the atmosphere. Therefore, much of the liquefied gas inside the can is released into the atmosphere, and the amount of liquefied gas used is increasing considerably. However, since these fluorocarbon gases and LPG are relatively expensive, the conventional methods have a considerable impact on the overall price of the aerosol spray. In addition, as has been pointed out in recent years, when large amounts of fluorocarbon gas are emitted into the atmosphere, there is a risk of destroying the ozone layer in the atmosphere.In order to prevent such environmental destruction, However, it is necessary to reduce the amount of fluorocarbon gas emitted in conventional aerosol sprays.The present invention solves the above problems in aerosol sprays, and uses liquefied gases such as fluorocarbon gas and LPG as propellants. The aim is to significantly reduce consumption.

The present invention provides a gas chamber in an aerosol can, fills the gas chamber with liquefied gas, and supplies the liquefied gas from the gas chamber into the aerosol can when the pressure for extruding the chemical solution in the aerosol can decreases. In this way, the liquefied gas is used exclusively for extruding the chemical solution, and the amount of liquefied gas discharged into the atmosphere is reduced.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view including a partial cross section showing the entire aerosol spray, and FIG. 2 is an enlarged longitudinal sectional view showing the structure of the gas chamber.

Reference numeral 1 in the figure is an aerosol can, and a mountain cup 2 is fixed to the top of the aerosol can.

The top of the mountain cup 2 is equipped with a spray valve 3, and the top is equipped with a nozzle 3a. A pipe 4 connected to the spray valve 3 is attached to the lower side of the mountain cup 2, and this pipe 4 extends to the bottom of the can. On the other hand, a bottom plate 5 is fixed to the bottom of the aerosol can 1, and a gas chamber 6, which is a feature of the present invention, is attached to a mounting hole 5a formed in the center of the bottom plate 5. This gas chamber 6 consists of a case 7 located inside the aerosol can 1 and a bottom lid 8 located outside J of the bottom plate 5.
It is formed by screwing together. An O-ring 9 is clamped at the joint between the case 7 and the bottom cover 8, and this O-ring 9 maintains airtightness at the mounting part of the gas chamber 6. A projecting body 7a is formed at the upper part of the case 7. A supply port 7b that communicates the inside of the gas chamber 6 and the inside of the aerosol can 1 is formed on the side of this projecting body 7a. This supply port 7b is covered with a band 10 made of an elastic material such as rubber. This band 10 acts as a check valve, allowing the liquefied gas G in the gas chamber 6 to flow out into the aerosol can 1, but conversely preventing the chemical solution M in the aerosol can 1 from flowing into the gas chamber 6. There is. On the other hand, the bottom cover 8 is also formed with a projecting body 8a extending inward of the gas chamber 6, and a guide hole 8b opening into the atmosphere is bored in the projecting body 8a. An inlet 8C is formed on the side of the inner end of the inlet 8C, and this introduction hole 8b and the inlet 8
The inside of the gas chamber 6 is designed to be able to communicate with the atmosphere by means of the gas chamber 6. This injection port 8C is covered with a band 11 made of an elastic material such as rubber. this band 1
1 acts as a check valve, allowing gas to be injected into the gas chamber 6 from outside the can through the inlet 8C, but conversely, the liquefied gas G in the gas chamber 6 is prevented from flowing out of the can. . The assembly order of this aerosol spray is to first attach the case 7 and the bottom cover 8 to the bottom plate 5 of the aerosol can 1, and then
form.

Next, a chemical solution M mixed with a suitable solvent in place of the conventional liquefied gas is filled into the aerosol can 1, and then a mountain cup 2 equipped with a spray nozzle 3 is fixed to the top of the can. Almost at the same time as installing the mountain cup 2, remove the air in the space A at the top of the can and add N2 or CO to the inside of the can. Inject gas such as at a constant pressure. This N2
The gas or CO2 gas is injected at a pressure approximately equal to the vapor pressure of fluorocarbon gas, LPG, or the like. That is, this gas pressure becomes the initial pressure for extruding the drug M. By injecting these gases, fluorocarbon gas and LPG
In particular, by using N2 gas, pressure fluctuations within the can during storage of the aerosol spray can be minimized. Next, liquefied gas such as fluorocarbon gas or LPG is injected into the gas chamber 6 through the introduction hole 8b of the bottom cover 8 and the injection port 8C. Said N.
Gas or CO. Since the pressure in the space A of the aerosol can 1 is increased by the gas to an extent equal to the vapor pressure of the liquefied gas G, the liquefied gas G injected into the gas chamber 6 flows into the space inside the can from the supply port 7b. Do not leak into section A. Therefore, the liquefied gas G can be injected into the gas chamber 6 at a predetermined pressure against the pressure within the space A. Next, the operation of this aerosol spray will be explained. When using an aerosol spray, lower the spray valve 3 with your finger,
The nozzle 3a and the pipe 4 are communicated with each other.

As a result, the space A of the aerosol can 1 is filled with N.
Gas, CO. Due to the initial pressure of the gas or the like, the chemical solution M is pushed up into the pipe 4 and further sprayed into the atmosphere from the nozzle 3a. When a certain amount of the chemical M is pushed out and the pressure in the space A decreases, the amount of vaporized gas G in the gas chamber 6 increases, and the vaporized gas flows from the supply port 7b to the rubber band 10.
is pushed open and flows out, replenishing the insufficient pressure within the space A. Even after that, the liquefied gas G in the gas chamber 6 continues to gradually flow out into the space A as the chemical solution M is sprayed. Next, FIG. 3 shows another embodiment.

In this embodiment, a gas chamber is provided below a mountain cup 2 fixed to the top of an aerosol can 1. That is, the case 11 has a valve holding part 11a formed at the upper center thereof, and an annular gas chamber part 11b formed at the lower side of the case 11. On the other hand, a cylindrical body 2a is formed in the center of the mountain cup 2, and a bush 12 and a packing 13 located below the bushing 12 are housed inside the cylindrical body 2a. The valve holding portion 11a of the case 11 is inserted into the cylindrical body 2a and is in pressure contact with the packing 13. Further, the spray valve 3 is held within the bush 12 so as to be vertically movable. Inside the spray valve 3, an outflow hole 3b communicating with the nozzle 3a and a small hole 3C continuous to the lower end thereof are formed, and the perforated portion of the small hole 3C is in pressure contact with the packing 13 (note that , the illustration of the nozzle 3a is omitted in FIG. 3). Inside the valve holding part 11a of the case 11, a retainer 14 is inserted at the lower end.
A spring 15 supported by is installed inside,
The spray valve 3 is urged upward by the elastic force of the spring 15. Further, a hole 11C is bored at the lower end of the valve holding portion 11a, and the pipe 4 is connected to the lower side of the hole 11C. On the other hand, the upper part of the gas chamber part 11b is covered with an upper lid 16, and this upper lid 16 is in contact with the lower surface of the mountain cup 2. Further, an O-ring 17 is interposed in this contact portion to maintain airtightness. A supply port 11d consisting of a minute gap is formed at the contact portion between the outer side of the gas chamber 11b and the top lid 6, and this supply port 11d allows communication between the inside of the gas chamber 11b and the inside of the aerosol can 1. We are now able to communicate with each other. The outside of the supply port 11d is covered with a band 18 made of an elastic material such as rubber, and the check valve function of the band 18 allows the liquefied gas G in the gas chamber 11b to be removed from the aerosol can. On the other hand, the gas inside the aerosol can 1 or the chemical solution M cannot flow into the gas chamber 11b. On the other hand, an injection port 11e consisting of a minute gap is formed at the abutting portion between the inner side of the gas chamber portion 11b and the upper lid 16, and this injection port 11e is connected to the valve holding portion 11.
It can communicate with the atmosphere through the outer periphery D of the bush 12 through a gap B between the bush 12 and the cylinder 2a, and a gap C between the bush 12 and the cylinder 2a. Inlet 1
The outside of 1e is covered with a band 19 formed of an elastic body, and the check valve function of this band 19 allows gas to be injected from the injection port 11e into the gas chamber 11b.
On the contrary, the liquefied gas G in the gas chamber 11b cannot flow out from the injection port 11e. Note that the pipe 4
A vapor tap 11f is bored at a side position of the upper end connecting portion of the valve holder 1, and the space of the aerosol can 1 and the inside of the valve holding portion 11a are communicated with each other by this vapor tap 11f. In the aerosol spray shown in FIG. 3 above, fluorocarbon gas, LP,
A liquefied gas such as G is injected.

That is, the liquefied gas G flows from the outer circumference D of the bush 12,
Passing through each gap C and B, and passing through the injection port 11e,'
The band 19 is pushed open and the gas is injected into the gas chamber 11b. On the other hand, the aerosol can 1 is filled with a chemical solution M mixed with an appropriate solvent, and the space of the aerosol can 1 is filled with N2.
Fill with gas or CO2 gas at a constant pressure. This point is the same as that shown in FIGS. 1 and 2 above. Next, the operation of this aerosol spray will be explained based on FIG. 4.

When using an aerosol spray, the nozzle 3a and the spray valve 3 are pushed down with a finger.

As a result, the small hole 3C formed in the spray valve 3 moves to the lower side of the packing 13, the airtightness is released, and the outflow hole 3b and the internal space of the valve holding part 11a communicate with each other through the small hole 3C. be done. The chemical solution M in the aerosol can 1 is pushed up into the pipe 4 by the pressure of N2 or CO2 gas filling the space inside the can, and is further pushed up into the inside of the valve holding part 11a, the small hole 3C, and the outflow. It passes through the hole 3b and is sprayed into the atmosphere from the nozzle 3a. When the pushing force on the nozzle 3a is removed, the spray valve 3 is raised by the force of the spring 15, the small hole 3C is closed by the packing 13 as shown in FIG. 3, and the outflow of the chemical solution M is stopped. When the pressure in the space inside the aerosol can 1 decreases due to extrusion of the medicine M, the liquefied gas G in the gas chamber 11b is vaporized and supplied into the aerosol can 1 from the supply port 11d, and the aerosol can 1 The pressure in the internal space is replenished. In the embodiment shown in FIG. 3, the internal space of the valve holding part 11a and the inside of the aerosol can 1 are communicated with each other by the vapor tap 11f. Holding part 11a
flows inward. Then, when opening the small hole 3C of the spray valve 3, gas is discharged into the atmosphere together with the chemical solution M, and the discharge of this gas promotes the formation of a mist of the chemical solution M in the atmosphere. It's summery. Note that in the embodiments shown in FIGS. 1 to 3, the supply ports 7B, lld
The outer side of the gas chamber 6, 11b is covered with a band 10, 18 to form a non-return mechanism, but as another mechanism, the supply port 7B, lld is covered with a liquid-impermeable membrane, and the gas in the gas chamber 6, 11b is connected to an aerosol can. Alternatively, the medicine M in the aerosol can 1 may be prevented from flowing into the gas chambers 6 and 11b. As described above, according to the present invention, a gas chamber is provided in an aerosol can, a liquefied gas such as fluorocarbon gas or LPG is sealed in the gas chamber, and when the pressure in the aerosol can decreases, the gas chamber Since the gas is supplied into the aerosol can from the supply port, the liquefied gas fills the space inside the can exclusively and performs the extrusion action of the chemical solution. The amount emitted into the atmosphere will be reduced, and the amount of liquefied gas used will be significantly reduced.

For example, in an aerosol can with a content capacity of 300cc, there is conventionally 1
Although about 50 cc of liquefied gas was filled, according to the present invention, it is possible to reduce the amount of liquefied gas used to about 4 cc. Furthermore, as shown in the embodiment shown in FIG. 3, even if a vapor tap 11f is provided to blow some of the waste into the atmosphere, the amount of liquefied gas used is 10
About cc is sufficient, and it is possible to reduce it to 1/10 to 1/20 of the conventional value. By reducing the amount of expensive liquefied gas used in this way, it is possible to reduce the overall cost of the aerosol spray. Furthermore, since the amount of fluorocarbon gas emitted into the atmosphere is drastically reduced, the risk of depletion of the atmospheric ozone layer, which has been pointed out in recent years, is also reduced, which has the effect of helping to protect the environment.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a front view including a partial cross section showing the entire aerosol spray, Fig. 2 is an enlarged vertical sectional view showing the gas chamber, and Fig. 3 is the gas chamber. A vertical cross-sectional view showing an embodiment in which the is provided on the lower side of the mountain cup,
FIG. 4 is a longitudinal cross-sectional view of the valve portion showing a chemical liquid spraying state. 1...Aerosol can, 2...Mountain cup, 3...Spray valve, 3a...
... Nozzle, 6, 11b ... Gas chamber, 7a
, 11d... Supply port, 10, 18...
Non-return mechanism, 8c, 11e... Inlet, 11, 1
9...Check valve, M...Medical solution, G...
...Liquefied gas.

Claims (1)

[Scope of Claims] 1. A spray nozzle is equipped on the top of an aerosol can containing a chemical solution, and a gas chamber for sealing liquefied gas is provided inside the aerosol can, and this gas chamber has an injection port communicating with the outside of the can. The inlet is provided with a check valve that prevents gas from flowing out of the can, and the gas chamber is provided with a supply port that communicates with the inside of the aerosol can. allowing gas in the room to flow into the aerosol can, and
An aerosol spray equipped with a check mechanism that prevents the chemical liquid in the aerosol can from flowing into the gas chamber. 2. The aerosol spray according to claim 1, wherein the check mechanism is a check valve whose supply port is covered with an elastic body. 3. The aerosol spray according to claim 1, wherein the check mechanism is a liquid-impermeable membrane covering the supply port.