DE1954740A1 - Spray valve for aerosol container - Google Patents

Description

19 5 4 7 A Q

Scovill Manufacturing Company, Waterbury, Connecticut, USA

Spray valve for aerosol containers

The invention relates to a spray valve for aerosol containers and is primarily intended to be clogging to be avoided at any point in the flow system. This is intended to ensure a smooth flow from the throttle opening at the entry of the valve housing all the way to the actuator are ensured by places sudden expansion should be avoided.

It has been found that conventional aerosol valves with certain materials that contain a high percentage of metallic salts, as is the case with antiperspirant preparations are not working satisfactorily. In particular, there was clogging of the opening on the valve stem and also, albeit to a lesser extent, due to crystallization in the lower part of the spring assembly or the valve housing.

According to the invention, such sources of error are reduced by a novel shape and construction of the valve stem as well as the valve housing. First, the valve stem is designed so that it has a gradually widening flow channel from its inlet opening, which creates a turbulent flow at high speed.

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testifies, wherein the side walls of the channel near the inlet opening are shaped and arranged so that any remnants the material to be sprayed as it remains in the shaft between the individual actuations of the valve, be swept away. Furthermore, the valve housing is given a substantially smooth inner wall which gradually extends along its length a relatively long flow channel expanded through the actuating attachment to an opening in the bottom of the valve housing. This opening is almost as wide as the bottom section of the housing in its interior, with only one narrow shoulder ν «remains, which has a seat for the valve spring forms »and the side walls of the housing itself are as smooth as possible and converge towards the area of the valve head.

Further details and advantages of the invention emerge from the following description of an exemplary embodiment which is shown in the figures.

1 is a perspective illustration thereof - a middle section showing the essential parts of the whole

Valve can be recognized;
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2 shows a longitudinal section through the valve in the closed state;

3 shows a longitudinal section through the valve in the open state, the valve member itself appearing uncut;

FIG. 4 shows a broken longitudinal section according to part of FIG. 2, but on a larger scale; FIG.

FIG. 5 shows a longitudinal section of the same kind in a plane perpendicular to FIG. 4; FIG.

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Pig. 6 is a side view of the valve member, wherein a Part appears broken away to reveal one of the inlet openings of the valve stem;

Pig. 7 is a plan view of the valve stem;

Pig. Figure 8 is a cross-section along line 8-8 in Pig. 5 and

Pig. 9 one such according to line 9-9 in Pig. 5 ·

The valve shown is functionally such as that disclosed in Briechle's US Pat. No. 3,158,298 is specified. Such a valve can be operated by cribs and allows a powerful gas outlet.

The illustrated metal cap 10 has a rolled Volume 11 for connection to the mouth of a container as well a central elevation 12, the ceiling 13 of which has a central opening 14. An annular valve seat 15 also has a central opening 16, which is aligned with opening 14 of the cap, and rests on the underside of the ceiling 13 of the cap. The valve body consists of a one-piece pressed body made of a suitable plastic which is essentially shell-shaped is and a bottom 17 and a side wall 18 with a has slightly inclined inner surface 19, which leads to a reinforced cylindrical section 20. This section 20 carries all around ribs 21 which are connected to the underside of the cap top 13 are in communication to allow a quick pull when the valve seat 15 is depressed. The wall of elevation the cap is depressed at 22 to retain the valve housing in the cap.

The valve member has a head 23 with a slightly designed

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taken top 24 »whose edge 25 on that designed as a seal Valve seat 15 comes to bear sealingly. Otherwise, however, unfold the usually provided recess on the Top of the valve head. A valve stem 26 protrudes therefrom Valve head through the central openings of the valve seat 15 and the cap top and ends in the form of a hollow cylindrical section 27. With 28 is an actuating button which is placed snugly on the cylindrical valve stem and has an outlet channel 29. In the valve stem a groove 30 is formed around its foot, the height of which is less than the thickness of the valve seat 15 so that the latter is still able to seal around the valve stem when the valve is closed.

At flow channels, a rectangular profiled channel 31 occurs first within the valve stem, which is from the cylindrical section 32 extends slightly beyond the groove 30. While the side walls of this channel are very close to each other, the channel is wide enough to to cut the groove 30 so that two opposite inlet openings 33 arise. Step just above the groove 30 two side channels 34 and 35 with diverging surfaces 36 and 37 near the bottom and also diverging Areas 38 and 39 near the outlet that go into the Bore of the cylindrical portion 32 exceed. This results in a high speed flow, especially in the area of the stem foot, and at the same time a sudden expansion in the entire channel inside the valve stem is avoided. Once actuated, a small amount of fluid will remain in the actuator button 28 and valve stem, which will accumulate around openings 32 and 33. Because of the fact, however, that the side walls of the rectangular channel

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31 face each other at a small distance and lead directly away from these openings, the remaining one will be Liquid pulled away from them by capillary forces, like this by the curvature of the miniscus 40 in Pig. 4 to Expression comes.

A pin 41 extending downward from the bottom 17 of the valve housing is used to receive a dip tube The inlet opening 43 at the bottom of this pin 41 necessarily has a small diameter, approximately of the order of magnitude of 0.4 mm to distribute the liquid to the valve. From this opening 43 the liquid flows through a relatively long channel 44 'which gradually emerges, preferably with smooth, slightly curved side walls, as if from the drawing can be seen, extended to a mouth 45 to the interior of the housing. This mouth has an only slightly smaller one Diameter than the housing inner wall 18 to to form a narrow shoulder 46 as a support for the valve spring 47. This spring presses on the underside of the valve head 23 to hold it on the valve seat 15. The mouth 45 is several times as large as the inlet opening 43 and has preferably at least ten times the cross section. In this way it is ensured that the liquid is under the Exposure to the propellant gas can gradually relax, so that no sudden changes in state occur that lead to a Crystallization! Clocks could be where the material enters the valve housing. This principle is a smooth flow in the entire valve housing as well as around the valve member and at the openings 32 and 33 and then in the valve shaft maintain yourself.

Preferably, as close as possible to the valve member, a steam vent opening is provided, which, as shown, simply forms a hole 48 within a small elevation 49 on the

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Valve housing can exist. This way they mix Vapor and liquid immediately before exiting the valve body to prevent premature mixing.

According to a modified one, not shown in the drawings Embodiment, the flow channel 44 is frustoconical, which is useful in practice has proven.

The degree to which crystallization takes place depends coincides with the drop in temperature that occurs during expansion takes place, and it has been shown that using the expansion ζ one according to the invention a good spray effect is achieved, with a significant increase in temperature within the mixture penetrating the valve to be recorded is.

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Claims (8)

195474Q patent claims 1. Aerosol canister valve with one of a throttle orifice for the entry of the pressurized liquid from the container outgoing flow channel, the one Has expansion zone in which the liquid can relax substantially, characterized in that the expansion zone of one of the Throttle opening (43) outgoing continuous expansion of the flow channel (44, ..) is formed. 2. Aerosol container valve according to claim 1, characterized in that the flow channel (44. ··) in the area the expansion zone is smooth-walled and this in a mouth opening (43) of at least the ten times the cross section of that of the throttle opening (43) ends. 3. Aerosolbehäliierventil according to claim 1 or 2, characterized marked that the flow channel (44 · ♦ ·) in the area of expansion ζ one is designed like a trumpet. 4 · Aerosol canister valve, located downstream of the expansion zone a valve opening normally closed by a valve member occurs, in particular after a of the preceding claims, characterized in that in connection with this valve opening (33) a Capillary channel (31) is provided through which liquid residues are drawn off from the valve opening. -8-009819 / 0536 5. Aerosol canister valve after. Claim 4, characterized in that g e k e η η ζ ei chnet that the capillary channel (31) forms part of the flow channel and extends from the valve opening (33) away to expand outwards. 6. aerosol container valve according to one of the preceding claims, characterized by a cap (10) with a central opening (14) for attachment to the mouth of a Aerosol container, an annular valve seat (15) made of elastic material in contact with the inside of the cap concentric to the opening, a valve with a head (23) which comes to rest on the underside of the valve seat, and an integral, hollow valve stem (26) extending away from the head through the openings of the valve seat and the cap protrudes outwards, as well as a bowl-shaped, the head of the valve member surrounding the valve housing (17, 18), which at its bottom (17) has a downwardly protruding pin (41) reduced diameter, which is connected to a dip tube (42) is connected and receives the orifice (43), further characterized in that the expansion zone within the Pin like the bottom of the housing is housed that the bottom has a narrow shoulder surrounding the expansion zone (46) forms on which a spring (47) pressing the valve member against the valve seat is supported, and there is also the inner surface (19) of the valve housing above the shoulder widens essentially gently towards the area of the valve member. 7. aerosol container valve according to claim 5 and 6, characterized in that the capillary channel (31) in the connection on the head (23) of the valve member has a rectangular cross-section with side walls lying close together, that several openings (33) are provided immediately outside the head, which gently into the sides of the right 9019/0536 195474Q square channel pass over, and that two lateral channels (35, 36) from the side walls of the rectangular channel protrude radially outward, which begin at a point on the valve stem (26) above the openings, inclined Have wall surfaces (36, 37) in the vicinity of their foot end and diverge again towards their outer end, so that a steady expansion takes place after that, where the cross-section of the flow channel is a multiple of that at the base of the valve stem 8. aerosol container valve according to claim 7, characterized in that the distance between the side walls of the capillary channel (31) in the part of the valve stem (23) close to the foot is in the order of magnitude of 0.4 mm. 009819/0638