DE2251311A1 - DEVICE FOR CONTINUOUS DISPENSING OF A LIQUID MATERIAL FROM A PRESSURE VESSEL - Google Patents

Description

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SeOeJonnson & Son, Inc., Racina / Wisconsin (V.St.ν.Α.)

Device for continuously dispensing a liquid material from a pressure vessel

The invention relates to a device for the continuous dispensing of a liquid material from a pressure package » ΖφΒ * from an aerosol container.

Many products that are normally sold in pressure vessels could be used with larger hoods if the material could be dispensed consistently over a long period of time. Ζ · _Β β could air cleaners, fresheners, insecticides and medical products in the atmosphere longer period be sprayed need to be so that such funds are not spent in such strong concentrations, as far 'the Pail was with aerosol sprays. Another advantage of such a regulated flow of the pressurized product is that the pressure package can be left unattended for a long period of time while the product is continuously being dispensed.

So far, devices have been used for this purpose with which the products are slowly dispensed by means of evaporation could. For example, U.S. Patent 2,826,453

309817/0280

discloses a soak valve assembly in which a filter material pad is used together with a pressure pack · In this case the filter material absorbs the liquid in the Packaging and vaporizing this liquid into the ambient air. The product is therefore on the surface of the filter from the liquid state in the vapor state. In this In this case, the product to be dispensed must have a higher vapor pressure for evaporation, e.g. perfume. Know the product If the vapor pressure is low, a pool of liquid would simply form on the surface of the filter. aside from that any non-volatile solids dissolved in the product would leave a crust on the filter. With such establishments is therefore the usability on very specific products limited.

The invention therefore provides a device in which the flow of material out of the pressure package is regulated and the size of the emerging droplets can be influenced.

In particular, the invention provides a device with which a liquid material is consistently obtained from a pressure vessel can be issued, and which has a dip tube, a nozzle arranged above one end of the dip tube and a apertured member »that between the dip tube and the nozzle is attached, which member has an opening with a width of 0.5 to 15 microns.

The term "microemitter" used in the following description is intended to designate the device according to the invention that are made from the dispensing of a liquid product a pressure packaging regulates and influences. This goal is achieved by the arrangement of an aperture Pad on the upstream side of the outlet opening of an aerosol container. Depending on the desired particle size of the dispensed Product can be said member from a filter or consist of a membrane material. For example, droplets are extremely small, i.e., less than 5 microns in size required if the product is in the air for a long period of time to remain floating for air fresheners and air purifiers as well as best of insecticides and

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Insect repellants. In such cases a filter or membrane with 5 micron pores or openings would be suitable. On the other hand, slightly larger particles are required, which are supposed to destroy insects by direct contact, so that an appropriate filter or membrane must be selected. The invention contemplates the use of a member having openings that are 0.5 to 15 microns wide. Any material with openings within the stated width range is suitable for the purposes of the invention. E.g. are suitable Polycarbonate, glass, sintered silver, sintered stainless steel, sintered high density polyethylene, cellulose acetate, Cellulose nitrate, etched stainless steel, etched copper, electroplated iMickel, tin-lead alloy, rhodium, gold, Copper »silver or iron.

It is then possible to reduce the particle size from very small Drops, e.g. from less than 5 microns in size to large droplets on the order of 30 microns easily determined by that the diameter of the opening in the base is changed. For the selection of the suitable underlay, it is pointed out that that the amount of flow through the opening is influenced by the pressure, the viscosity, the density, the diameter the opening, the tortuosity and length of the flow path and the surface properties of the substrate.

It is further noted that the filter or membrane is not its satisfied (her) actual task of the invention, or to deposit different means _e from a liquid flow large material particles to remove or absorb and allow the evaporation of a liquid. In contrast to this, the opening or openings of the filter or the membrane serve to regulate the flow of liquid and to support the formation of drops. By regulating the liquid flow, the dispensing time of the product is changed significantly so that continuous dispensing can be obtained over a long period of time. Continuous dispensing can also be achieved by forming drops in the product. By forming small droplets, the product can be kept suspended in the air for a long time. ■

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The invention basically works by atomization or Fogging. This principle is described in a paper by W.K. Marshall Jr., "Atomization and Spray Drying," Chemical Engineering Prograss Monograph Series No. 2 »50, 1950, published from American Institute of Chemical Engineers. In the device according to the invention, atomization or misting is used carried out either hydraulically or pneumatically · In the case of hydraulic The liquid is squeezed out of the openings by the pressure exerted and divided into small drops, like a garden show. With pneumatic atomization or nebulization, a high velocity flow of vapor is used to break up the liquid. The steam flow is preferably derived from the propellant in the pressure pack, encounters the liquid either forward or behind the opening and divides the liquid into small drops. To make a change in the composition of the fluid separation, which contains the active substances in the pressure pack should avoid the vapor from a second liquid layer come. The propellant should then be largely concentrated in one of the two liquid layers.

In addition to the width of the openings on the membrane or on the filter, their number can also be determined so that the desired Submission takes place. Depending on the particular purpose of use the number of openings from one opening to up to 3 x 10 '

The device according to the invention can be designed as a complete unitary valve arrangement or as one separate sub-arrangement with the appearance of a "top hat", which can be easily attached to the valve stem of a normal aerosol valve.

The invention will now be described in detail. In the accompanying drawings the

1 shows a representation of a pressure package, which is equipped with a Microemitter is equipped according to the invention,

2 shows an enlarged vertical section through the pressure packaging and the microemitter according to Fig.i

with the valve closed,

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Figο3 shows a representation of the pressure packaging similar to Fig.2 with the valve open,

Figo4 an enlarged vertical section drawn by the micro-s emitter shown in Figure 1,

5 shows an enlarged vertical section through another embodiment of a top hat-shaped cap for the valve shown in Figure 1,

6-8 each an enlarged vertical section by a different embodiment of hydraulic microemitters according to the invention,

9 shows an enlarged vertical section through a microemitter according to the invention,

10 shows an enlarged vertical section through e ^ ne openwork base of the micro-emitter according to the Fig »a and the

Fig. 11-16 each an enlarged vertical section by a different embodiment of pneumatic Micromeraitcern according to the invention.

1 shows a typical embodiment known per se of an aerosol pressure container 10 _y which is normally filled with a liquid product (not shown) which is to be dispensed by opening a valve a double liquid phase is contained, or the propellant can be kept separate from the product in a manner known per se. As can be seen from FIG is attached to the upper rope of the container by means of a cap 16. In this embodiment, the microemitter can be adapted to a normal, pressure-operated valve and has a cylinder hat-shaped member 18 and a locking device designated as a whole with 20 * The valve consists of the conventional design and is replaced by a downward-facing one Pressure on the valve stem 22 is opened so that the liquid product is dispensed. Between the dip tube 12 and the

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Valve body 14 is attached to a pre-filter 24 so that the product is filtered before it enters the valve body. The material of this pre-filter can consist of any known filter material that separates the solid particles can lead to clogging of the valve parts.

On the upper part of the valve stem 22 is a top hat-shaped Element 18 arranged following the microemitter of the invention. This element 18 can be of any suitable type Material can be made, however, a plastic is preferable. The cylinder hat-shaped element 18 is designed so that the lower part can easily be attached to the valve stem can be pushed open and is securely stuck there. Since the valve stems are generally tubular, so the top hat-shaped element is also designed tubular and such that its inner diameter is approximately corresponds to the outer diameter of the valve stem. The top hat-shaped Element ends at the upper part in an outlet opening 26, between this and the upper part of the valve stem a perforated member 28, a seal 30, a filter and a seal 34 is arranged in descending order. For the openwork member 28, one of the above can be used Materials are chosen depending on the number and width of the openings required for the desired product and the desired result are needed. The openwork member 28 is preferably made of a thin film between a lip 36 and a first annular seal 30 is attached. The waterproofing 30 should be made of a material that will not be decomposed by the product or propellant, with flat rubber seals or plastic washers are preferable.

Since the openings are very small, there is a risk of dasa partially or completely clogs the openings of prematerials will. The liquid product must therefore be filtered before ee reaches the openings, so that all contaminating Foreign substances are excreted. In addition to the prefilter 24, there is therefore a second immediately in front of the perforated member 28 Filter 32 arranged. As can be seen from the drawings, the first seal 30 and a second one are the same

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Sealing 34 a filter film 32 arranged for each material is suitable "with which particles can be removed which are larger than the openings ·

The second seal 34 also serves as a seal between the top hat-shaped element and the upper part of the Valve stem a 22 so that there is no liquid at this point can seep through.

The cylinder hat-shaped element has on the 'outside an annular flange 40, which is preferably with the element is manufactured in one piece »As will be described later, the Y-valve can be operated with the flange.

The locking device 20 enables the pressure pack to be used if it is to be operated for a certain period of time. This locking device is designed in such a way that it can be attached to a normal valve cap 16 without difficulty. The locking device consists of a cylindrical upstanding member 42 with external threads 44, an inner annular flange 46 above the lower part of the cylinder, and an annular bead 48 projecting inwardly from the lower edge of the cylinder. The annular flange 46 rests against the upper part of the valve cap 16, while the bead 48 engages the lower lip of the valve cap 16 so that the cylinder 42 snaps into the cap 16 and is securely held there a cap 50 is screwed on, which has a concave upper side 52, in the center of which an opening 54 is provided, through which the top hat-shaped element 18 can _protrude , the edge of the opening forming a shoulder against which the annular flange 40 on element 18 rests can.

If the cap 50 is rotated clockwise, for example, with the cap being moved downwards, the shoulder will lie down 56 to the annular flange 40 and presses the cylinder cap-shaped element 18 and the valve stem 22 down, so that the Valve is opened. The valve can then remain open for as long this is needed, and can then simply be closed again by opening the cap 50 in the opposite direction

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is rotated so that the pressure on the valve stem 22 is released and the valve 14 is closed. The pressurized product is therefore continuously dispensed as long as the Cap 50 is screwed down, as shown in Figure 3.

As can be seen from the Pig.4, eylinderhutförmige, the element 18 is a film or sheet 28 having a number of apertures 58, although only a single aperture may be provided _e The openings 58 could also as a micro-openings, pores or Hadelstichlöcher are designated. When the valve is opened, the product is driven by the propellant through the dip tube 12 up through the prefilter 24 and up through the valve 14 and then pushed through the filter film 32 and through the openings 58 on the film 28. The liquid product is sprayed in small drops and expelled into the ambient air, as shown by the arrows.

FIG. 5 shows another embodiment of the top hat-shaped Structure provided with an internal shoulder 60 which rests on the upper part of a valve stem on the the cylindrical hat-shaped structure is placed in a chamber 62 a filter film 32 is arranged horizontally. The top hat-shaped Element tapers to form a nozzle channel 64 in which the perforated member 28 is immediately in front of the outlet opening 26 The openwork member 28 is secured in the channel 64 between the lip 36 and the seal 68. To prevent, that the filter film 32 closes the nozzle channel 64 under the pressure of the liquid product is at the inlet end of the Channel 64 a spreading member 70 is arranged.

6 shows another embodiment of a hydraulic microemitter according to the invention, in which the normal valve to be actuated by pressing down need not be provided. In this embodiment, a dip tube 12 forms part of the valve and is equipped with a filter 32 which is attached by means of seals 30 and 34. The tube is narrowed between the filter 32 and the end of the tube 72. Aul 'the dip tube 12 is an elongated cap 74 and holds an openwork member 28 firmly, bo that the openwork member 28 is the outlet end 76 of the

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Immersion tube covered. To the area of the openwork. To enlarge the member 28 through which the liquid product can penetrate, the above the outlet end 76 of the dip tube located part can be made somewhat curved, as shown at 78. The dip tube 12 and the cap 74 can be attached to each other be attached for example by means of an adhesive. The cap 74 is in the middle with a conical outlet opening 26 provided above the outlet end 76 of the dip tube. As shown in Figure 6, the exit port 26 is at the base the widest, but can also be the widest at the top, as shown in Jig. 7. According to the figures 6 and 7 is the nozzle cap 74 with an annular flange for attachment to a normal valve cap of a pressure package for example provided by means of an adhesive.

Another different type of hydraulic micro-emitter is shown in Fig.8, in which the dip tube ends in an annular plunge 80, which is approximately the size a normal valve cap 16. Above the splash 80 is a disk 82 is provided with an outlet opening 26 arranged in the middle, wherein between said two components an openwork member 28 is attached. The disc 82, the perforated member 28 and the puddle 80 are on the valve cap in a manner known per se, for example by means of a Adhesive ring 84 attached »In addition, a seal 86 is attached between the washer 82 and the valve cap 16 to to prevent the propellant or product from seeping out.

The explanations according to FIGS. 6, 7 and 8 will be high notices that the microemitter is the valve of the pressure package, so that; no depressurized valve 14 is provided. To close the nozzle and to prevent the product from being dispensed, any (not shown) suitable means are provided, e.g. a band or a Plug.

Pneumatic atomization is carried out in the manner ' that a stream of steam on the penetrating the ^ perforated limb Liquid droplets directed, which will make the drops

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BATH ORIGINAL

atomized. As shown in Fig. 9, the immersion tube is located with a narrowed end 88 to the openwork member 28 which is attached to a nozzle cap 74 in a suitable manner. The perforated member 28 is attached to the inside of the nozzle cap 74 by means of a sealing ring 30. The nozzle cap 74 and the sealing ring 30 have a larger inner diameter than the outer diameter of the immersion tube 12, so that An annular steam chamber between the two components mentioned 90 is formed. An outlet opening 26 arranged in the middle is connected to the outlet end of the immersion tube. The nozzle cap 74 is on the outside with an annular flange 92 for attachment to a pressure package in provided in a known manner. The propellant vapor occurs during use enters the steam chamber 90 and flows through the perforated member 28, as shown in Pig.10. Simultaneously the liquid product is separated from the propellant by the broken one Member 28 driven and leaves the member in the form of small droplets that are atomized by the propellant vapor. During one Storage of the pressure packaging, the outlet opening 26 can be closed in a manner known per se in order to dispense of the product.

The Pig · IJ shows another version of a pneumatic Micro emitters, whose immersion tube 12 at the upper end to a chamber 96 is expanded. The upper edge of the chamber defines a ledge 98 which carries an openwork member 28. This arrangement is attached to a conventional valve cap 16, the inwardly projecting flange 100 of which has an outlet opening 26 delimits. A disc is loosely arranged in the chamber 96 (102), which is supported by an annular shoulder 104 at the point of use is held on the inside of the chamber 96. A lateral passage 106 forms a passage through the chamber wall 108 Steam inlasakanai. If the valve is actuated, for example by removing a locking element from the outlet opening 26, the effect of the propellant vapor and of the Product liquid exerted pressure, dausing the disc 102 ο i from the shoulder 10-I lifts off your openwork member approaching. The disk 102 is formed by surface irregularities

BATH ORIGINAL

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held on penetrating member 28 approximately 0.125 mm from the openings. The propellant vapor and the liquid that is to say _e are, in this embodiment, prior to exiting with each other into contact, in the chamber around the floating disc and through the openings "The liquid product then exits the outlet orifice 26 in the form of fine droplets.

The steam flow and the liquid product can also be directed obliquely to the openwork member 28, as shown in FIG. In this case, the dip tube is 12 provided with a steam channel 110 and a product channel 112, which two channels on the perforated member under different Angles end. In this way, the vapor flows against the liquid droplets exiting at the outlet opening 28 and is atomized these. Another modification of this arrangement is shown in FIG Block two steam channels 110 are provided, the perforated member 28 only the outlet end 76 of the dip tube covered. When the product leaves the openings in the form of drops, these are hit directly by two streams of steam. The steam channels 110 are preferably arranged so that the Steam against the drops above the openwork member 28 flows at an angle of 60 ° with respect to the plane of the openings.

The steam can also be directed obliquely at the liquid droplets are after they have left the perforated member 28, as shown in Figures 14 and 15, ilach the Yy-ig. 14, the two steam channels 110 direct the steam onto the openwork link 28 that the steam from the openwork Member 28 exits at an angle of approximately 45 °. Do that 15, the steam channel 110 ends in a conical chamber 116, which is arranged concentrically to the outlet opening 26.

The Dairpfkanal 110 can also be parallel to the outlet end? 6 of the dip tube run, as, in the Fig ». 16, the steam flows through the perforated member 28 and is then by means of a flange 118 on the valve cap directed at the outlet opening 26 *

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In the embodiments described above, a liquid Propellants are carried along by the liquid product through the openings. This leads to a rapid volatilization of the Propellant, which promotes the atomization of the product.

Typical flow rates for conventional valves and for the microemitter according to the invention are compiled in the table below. Further, it is indicated how long a 200 Gramci-sleeve can be used in the said flow.

Tabel Valve output quantity

(g / min)

conventional 240 conventional 60 conventional 20th Microemitter 100 M ikroemitter 10 Microemitter 1 Microemitter 0.1 Microemitter 0.02

Operating time , 83 Gram for 200 , 3 min. O ₁ min. 3, min. 10 min. 2 min. 20th , 4 min. 200 Days I ₁ Days 7th

As can be seen from the above list, the micro-emitter valve according to the invention enables a particular product to be dispensed within a very long time. Since that Valve has no moving parts »so it can be manufactured relatively cheaply and is largely fail-safe The valve can also be adapted to conventional pressure packaging without difficulty

Claims

BATH ORIGINAL 309817/0280 ι;

Claims (1)

- 13 claims Device for continuous dispensing of a liquid from a pressure vessel, characterized by a dip tube, through a nozzle arranged over one end of the rope pipe and through a perforated link between the Dip tube and nozzle is attached and has an opening with a width of 0.5 to 15 microns. 2 · Device according to claim 1, characterized in that the openwork link made of a polycarbonate, glass, sintered silver, sintered stainless steel, sintered high density polyethylene, cellulose acetate, cellulose nitrate, etched stainless steel *, etched copper and made of electrical Downed winding, a tin-lead alloy, rhodium, gold, copper, silver and made of iron. 3. Device according to claim 1 _f, characterized by a filter medium which is fixed in the immersion tube. 4. Device according to claim 1, characterized by at least one steam channel which generates steam from the interior of the container leads to the nozzle and against drops of liquid which are driven through the broken limb 5 · Device according to claim 4 »characterized by a fixed member surrounding the immersion tube, said fixed member Having steam channel connecting the nozzle to the interior of the container connects » 6 · Device according to claim 4 or 5> characterized in that the steam channel outside the perforated member ends. 30ij B} 7/0 2 8 0 7 »Device according to claim 4 or '5» characterized in that that the steam channel ends from the openwork link from the inside. 8. Device according to claim 4 or 5 »characterized in that that the steam channel is in a concentric to the immersion tube funnel-shaped channel ends. 9. Device according to claim 4 or 5 »characterized in that that the steam channel runs parallel to the immersion tube, and that outside the perforated member there is a raised flange which directs the steam to the nozzle. 10 · Device according to claim 4, characterized in that the dip tube has an expanded chamber located in front of the perforated member, with an annular one Is provided that the steam channel through the shoulder Having a passage leading through the side wall of said chamber, and that between the shoulder and the perforated Link a loose disc is arranged. 11 · Device according to claim 1, characterized in that the nozzle consists of an elongated tubular nozzle member with a centrally located and with the dip tube in Connected opening consists »that the inner diameter of the nozzle member and the opening mentioned is larger than the outer diameter of the immersion tube, whereby an annular steam channel is formed between the components mentioned that the openwork link between said central opening and the dip tube said perforated member is arranged, and that the perforated member is held by a sealing ring on DUsengliecl will. 12. Device according to claim 1, with which a liquid can continuously be dispensed from an aerosol container which has a valve cap, a valve which can be actuated by means of a pressure switch ^; ! in rom / entLl from itself downwards into the container «r.it t ^; ; ckende; i immersion tube and an aieh voci / entIi aua i Ü 3 ti I / / 0 2 H U BAD ORIGINAL valve stem extending upward, characterized in that that on the end of the valve stem a top hat-shaped Link ir. Is placed with a dispensing opening that in the cylindrical member between the valve stem and the rabbit has that said openwork link arranged, that a filter means is arranged in the cylindrical member between the perforated member and the valve switch, . can filter out the solid particles that are at least as large as the opening is wide that in the top hat-shaped Limb sealing means are arranged to prevent the liquid from seeping out that would normally flow out the valve stem flows through the top hat-shaped member, and that locking means are provided which act on the cylinder cap-shaped member and press down the valve stem, the valve being opened and the device being held open. 13 »Device according to claim 12, characterized by a Pre-filter means, which is arranged between the dip tube and the valve that can be actuated by pressing the bodice. H. Device according to claim 12, characterized in that said locking means consist of one on the valve cap to be applied upright and cylindrical Link and consist of a twistable cap which is screwed together with the cylindrical member and in the Center has an opening through which the dispensing outlet extends through that hand of said opening with the cylinder hat-shaped member cooperates in such a way that by a downwardly directed screw rotation of said cap the cylindrical member depressed and the valve is operated. 15. Device according to claim 12, characterized by, a star-shaped expansion member between the filter medium and the perforated member which prevents the flow of liquid through the filter medium from being interrupted. 3 0 9 8 1 7 / Ü 2 8 0 ^BÄD