JPS5921669B2 - Aerosol injection device equipped with a relay bag - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides the following advantages:
The present invention relates to an aerosol injection device that uses a gas with low solubility in a propellant as a propellant, and aims to provide a means for improving injection stability against solution consumption.

When a low-solubility gas such as the one described above is used as a propellant instead of CFC gas, which is conventionally used as a propellant in an aerosol injection device, the spraying power rapidly decreases as the solution is consumed, and the spray becomes difficult to spray. It is well known that there is uncertainty.

This destabilization occurs when the propellant, a low-solubility gas,
This is due to the fact that it merely acts as a pressing force on the liquid surface of the solution, and does not have the effect of breaking up the droplets when they are released from the injection nozzle, unlike fluorocarbon gas dissolved in the solution. However, since Freon gas is increasingly suspected of causing upper air pollution, alternative propellants are required, and the use of low-solubility gases is currently unavoidable. Therefore,
In view of this situation in aerosol injection technology, the present invention aims to improve injection instability when a low-solubility gas is used as a propellant.The present invention will be described below with reference to the illustrated embodiments.

That is, 2 is a valve housing having a movable injection valve 1 therein, and a relay bag 3 made of a soft elastic membrane such as rubber is provided around the valve housing. This relay bag 3 has a through hole 5 bored in the wall of the valve case 2.
At the same time, the bag opening of the relay bag 3 surrounds the valve housing 2 and opens into the inside of the valve housing 2 through the mountain cap 8.
While the liquid suction tube 6 opens into the bottom of the injection container. Since the present invention is constructed as described above, the solution under the pressure of the injection gas in the injection container fills the relay bag 3 and the valve housing 2. In this case, the pressure on the inside and outside of the relay bag 3 is equal, and the bag wall maintains an open shape as shown in the figure. Therefore, when the movable injection valve 1 is opened by operating it with a fingertip, the liquid in the relay bag 3 is released into the push button 9.
The solution is injected from the nozzle 10 and the solution outside the relay bag 3 is replenished into the relay bag 3 in the injection container. By the way, the effective injection pressure during spraying by an aerosol injection device is the pressure applied to the solution currently present in the valve housing.

In conventional aerosol injection devices, the effective injection pressure is mainly supplied by the solution rising through a very thin and long liquid suction pipe, so it is caused by fluid resistance loss that occurs as the liquid passes through and rises. However, the gas pressure applied to the liquid level in the container is greatly reduced. If the injection gas has low solubility and the liquid level is lowered due to consumption of the solution and the space inside the container is expanding, the gas pressure applied to the liquid level has already become considerably small, so the above-mentioned Effective injection pressure decreases further. However, according to the present invention, when the valve is opened, the solution supplied into the valve housing 2 is of course directly supplied from the large-capacity relay bag 3, and the above-mentioned effective injection pressure is increased by increasing the liquid suction pipe 6. As a result, the amount of reduction in effective injection pressure due to fluid resistance loss due to the liquid suction pipe is extremely small, as the majority of the solution is supplied from the entire outer periphery of the soft elastic membrane with a large surface area. Therefore, even if the gas pressure in the injection container remains the same, the effective injection pressure available for atomization is significantly increased. With the device according to the present invention, if the injection is continued, the peripheral wall of the relay bag 3 will contract as shown by the chain line, regardless of the solution being replenished through the liquid suction pipe 6. This shows that the effective injection pressure is It can be seen that most of the water is supplied through the peripheral wall of the relay bag 3. Thus, in the conventional injection device that supplies solution directly to the valve housing from the liquid suction pipe,
According to this invention, even at the end of consumption when the gas pressure inside the container has decreased to such an extent that fine spray cannot be obtained, according to the present invention,
A high effective injection pressure is still maintained, so that good atomization can still be obtained even when low-solubility gases are used as propellant instead of the conventionally widely used Freon gas. In addition, in this invention, although the relay bag 3 of the illustrated example is glued to the mountain cap 8 of the injection container at the flange part 7 which is the bag opening, the flange part 7 is extended as shown by the dotted line 12, It can also be fixed by winding via its edge 13.

According to the embodiment illustrated above, the bag opening of the relay bag 3 is tightly fixed to the mountain cap 8, but the bag opening is designed to be small and such a bag opening is tightly fixed to the valve casing 2. Naturally, the same applies to the case. Furthermore, if a check valve is attached to the tip of the liquid suction pipe 6 that is the open end of the relay bag 3 to the bottom of the container, it is possible to prevent the injected gas from entering when the container is used upside down.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view of a main part of an embodiment of the device according to the present invention. 1 is a movable injection valve, 2 is a valve housing, 3 is a relay bag, 4 is a valve spring,
5 is a through hole, 6 is a liquid suction pipe, 7 is a flange, 8 is a mountain cap, 9 is a push button, and 10 is a nozzle.

Claims (1)

[Claims] 1. In an injection device that uses a gas with low solubility in the injection solution as a propellant, a valve housing 2 having a movable injection valve 1 therein is made of a soft elastic membrane, and a flexible membrane is provided inside the valve housing 2 and at the bottom of the injection container. This aerosol injection device is provided with an open relay bag 3, which surrounds a valve housing 2 with its opening, and which is tightly fixed to a mountain cap 8 or the valve housing 2.