EP0008577A1

EP0008577A1 - Valve for an aerosol container.

Info

Publication number: EP0008577A1
Application number: EP19790900123
Authority: EP
Inventors: Augustinus J M Wittenhorst
Original assignee: Von Treu AG
Current assignee: Von Treu AG
Priority date: 1978-02-02
Filing date: 1979-02-02
Publication date: 1980-03-05
Also published as: WO1979000582A1; EP0008577B1; DE2804425C2; DE2804425A1

Abstract

La soupape pour recipient d'aerosol comporte un corps de soupape qui est place dans l'orifice du recipient et auquel est raccorde un appendice dont la section presente un etranglement, destine a recevoir un tuyau ascendant. L'appendice (7) presente, dans le but d'obtenir une meilleure repartition du solvant et de l'additif lors d'une decharge simultanee, rapide et a debit stable, en amont du tuyau ascendant (8) un orifice d'admission (9) dans lequel est place un petit tube (10), par exemple une canule ou analogue qui s'etend jusqu'a l'interieur de l'appendice (7). Le petit tube (10) atteint, de preference, l'axe de l'appendice (7). Le diametre interieur du petit tube (10) sera dans un rapport de 1 : 3 a 1 : 7 avec le diametre interieur de l'appendice (7). Le petit tube (10) est, en particulier, dispose radialement et son extremite exterieure affleure la surface exterieure de l'appendice (7).The aerosol container valve has a valve body which is placed in the container orifice and to which is connected an appendage, the section of which has a constriction, intended to receive an ascending pipe. The appendix (7) presents, in order to obtain a better distribution of the solvent and the additive during a simultaneous, rapid and stable flow discharge, upstream of the ascending pipe (8) an inlet orifice (9) in which is placed a small tube (10), for example a cannula or the like which extends to the interior of the appendix (7). The small tube (10) preferably reaches the axis of the appendage (7). The inside diameter of the small tube (10) will be in a ratio of 1: 3 to 1: 7 with the inside diameter of the appendix (7). The small tube (10) is, in particular, arranged radially and its outer end is flush with the outer surface of the appendage (7).

Description

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Valve for aerosol containers

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Technical field

The invention relates to a valve for aerosol containers with a valve housing which can be fully or partially inserted into the mouth of the aerosol container and which is followed by an extension τon smaller free cross section for receiving a riser pipe.

State of the art

Valves of this type are generally known and are used in a variety of ways. Although they generally have a high level of operational safety, it occasionally occurs when aerosols are released that a uniform atomizing mist does not form. Instead of a uniform and rapid discharge, a batch-wise discharge can then be observed, in which the atomizing mist flutters and no longer spreads specifically and quickly enough. The valve is exposed to fluctuating pressure loads and begins to knock and can also freeze.

These phenomena depend on the prevailing pressure conditions in the aerosol container and are difficult to predict. In particular, in the event that such disturbances occur, subsequent action on the aerosol container is excluded. The pressure in the aerosol container can still be relatively high. Presentation of the invention

This is where the invention begins. It is based on the task of designing a valve of the type mentioned at the outset in such a way that the solvent and active ingredient are always better distributed and discharged faster at high and low pressures.

The object is achieved according to the proposal of the invention in that the extension above the

Riser tube has an inlet opening into which a tube extending into the interior of the extension, an Eanule or the like is inserted.

The gas phase in the aerosol container is given a further function by the invention. While it was previously only effective in such a way that it forced the liquid phase via the riser pipe into the valve chamber and out of the aerosol container, it now additionally acts directly on the outflowing liquid phase via the inlet opening and the tube, whereby the discharge of solvent and Active ingredient supports.

The local area of action is chosen so that an optimal effect is achieved. This area lies below the actual valve chamber, where the flow velocity is correspondingly high due to the small flow cross section.

In contrast, it is known for other reasons to make a side hole on the valve housing with its enlarged cross section, namely for CO ₂ -containing blowing agents, in which an impermissibly high pressure can build up in the gas phase. About such Side hole should then only be relieved of pressure there.

In contrast to this, according to the proposal of the invention the gas phase is not simply reduced in pressure, but is used to increase the flow rate of the outflowing aerosol, the propellant being loaded with solvent and active substance and the flow becoming more uniform and stable.

The tube proposed by the invention, the cannula or the like extends into the interior of the extension and thus ensures that the gas phase becomes effective in the desired manner.

The particular advantages of the invention lie in the fact that a well-distributed atomizing mist always occurs and the active ingredient is rapidly dissolved and distributed in the environment. The atomization is so intense that even an otherwise flammable solvent loses its ignitability practically immediately after exiting the valve, since it drops to concentration values that no longer permit ignition. As a result, a valve according to the invention can also reduce the flammability of aerosols, and zv / ar in a purely physical way.

A valve is particularly effective if the tube or the like extends up to approximately the central axis of the extension.

According to another proposal, the inside diameter of the tube is related to the inside diameter of the fort set in a size ratio of about 1: 3 to about 1: 7.

For its attachment as well as its function, it is advantageous if the tube or the like is aligned radially.

The tube or the like expediently closes to the outside approximately flush with the extension.

Brief description of the drawing

Further details are described below for preferred exemplary embodiments with reference to the drawing. In it show:

Figure 1 shows an inventive valve in a vertical section and

Figure 2 shows a valve according to the invention in connection with an aerosol container made of glass in front view.

According to FIG. 1, a valve according to the invention has, inter alia, a valve housing 1, a valve body 2 guided therein with an outlet pipe 3 and a closure cap 4. The cap 4 is made of metal and is placed on the valve housing 1 from the outside and pressed against it. It has an edge 5 with which it can be placed over the mouth of an aerosol container and can also be pressed against it. Between the valve housing 1 and the valve body 2, a compression spring 6 is arranged, which strives to always keep the valve body 2 in the closed position. As can also be seen from FIG. 1, an extension 7 adjoins the valve housing 1, into which a riser pipe 8 is inserted. The extension 7 has a substantially smaller free cross section than the valve housing 1.

According to the proposal of the invention, the extension 7 has an inlet opening 9 above the riser pipe 8, into which a tube 10 is inserted. The tube 10 is aligned radially to the extension 7 and extends approximately in the middle. It has a comparatively small inside diameter, its inside diameter depending on the inside diameter of the riser pipe 8 or the extension 7.

According to FIG. 2, a valve according to the invention is connected to an aerosol container 11 made of glass. For this purpose, the cap 4 is placed on the mouth of the aerosol container 11 and pressed by flanging its edge 5. The outlet pipe 3 carries one

Atomizer head 12, by means of which it can be operated. The valve housing 11 is completely inserted into the mouth of the aerosol container 11. The inlet opening 9 together with the tube 10 is only perceptible from the outside as a punctiform inlet in the extension 7. The separation of the contents of the aerosol container 11 into a gas phase and a liquid phase is indicated by a dashed line 13.

Claims

Expectations

1. Valve for aerosol containers with a fully or partially insertable into the mouth of the aerosol container, which is followed by an extension of smaller free cross-section for receiving a riser pipe, characterized in that the extension (7) above the riser pipe (8) has an inlet opening (9), into which a tube (10), a cannula or the like extending into the interior of the extension (7) is inserted.

2. Valve according to claim 1, characterized in that the tube (10) or the like. Up to about the central axis of the extension (7).

3. Valve according to claim 1 or 2, characterized in that the inner diameter of the tube (10) to the inner diameter of the extension (7) is in a size ratio of about 1: 3 to about 1: 7.

4. Valve according to one of claims 1 to 3, characterized in that the tube (10) od. Like. Radially aligned.

5. Valve according to one of claims 1 to 4, characterized in that the tube (10) or the like. Completely flush to the outside with the extension (7).