Trigger operated foam sprayer, spray head and foam nozzle therefor

Abstract

This invention relates to a trigger-operated foam ejector, comprising a reservoir, a foam nozzle, and a pump mechanism with a trigger. The foam nozzle has a foam outlet and a liquid inlet orifice spaced apart from the foam outlet for forming a liquid jet along a liquid path in the direction of the foam outlet. The liquid inlet orifice defines a main flow direction coinciding with the central axis of the orifice. The foam nozzle also includes a baffle disposed in the liquid path, wherein the baffle includes an impact surface oriented at a first angle relative to the main flow direction, the first angle being an acute interior angle. The invention also relates to such foam nozzles themselves.

Description

Technical Field

[0001] This invention relates to a trigger-operated foam ejector. Specifically, the trigger-operated foam ejector is of the continuous or sustained-release type. Such ejectors generally include a reservoir for containing a liquid to be foamed, and an ejector head connected to the reservoir. The ejector head may include a pump mechanism and a trigger for operating the pump mechanism. Operation of the trigger causes the pump mechanism to eject liquid from the reservoir through a nozzle. The ejector head of the foam ejector generally also includes a foam nozzle for forming foam from the liquid as it is ejected through the nozzle. Background Technology

[0002] Persistent or continuous type trigger-operated sprayers are known. For example, the trigger-operated sprayers sold by the applicant under the trademark Flairosol® are capable of producing persistent or even continuous sprays. For examples of such sprayers, see, for example, the applicant's US 9,714,133 B2. Generally, such trigger-operated sprayers have a method that buffers the energy introduced into the sprayer by movement of a trigger and is used to release the energy over a persistent or even continuous period of time until the trigger is no longer operated and the energy is slowly depleted. Persistent or continuous trigger-operated sprayers are generally very suitable and popular because they allow for the easy application of a variety of substances and give a spray impression comparable to that of aerosols using pressurized containers.

[0003] Foam nozzles suitable for trigger-type injectors are generally known, for example, from US 5,647,539 and US 4,463,905. However, the trigger-type injectors disclosed in these documents are not persistent or continuous trigger-type injectors, and the foam nozzles proposed therein are insufficient for forming foam from such injectors.

[0004] However, in reality, distributing the desired quality of foam from the aforementioned types of injectors has always been a challenge, and this application addresses that challenge.

[0005] The foam nozzles of US 5,647,539 and US 4,463,905 each have a foam outlet and a liquid inlet orifice located at a distance from the foam outlet.

[0006] US 4,219,159 discloses a foam generating element used in conjunction with a trigger-operated dispenser. It includes a tubular foam forming chamber disposed between an orifice and a mesh. The diameter of the foam forming chamber is substantially larger than the diameter of the orifice. Two spaced-apart parallel interrupted rings project radially inward from the wall of the foam forming chamber and are impacted as the liquid spray fans out after exiting the orifice.

[0007] EP 0 505 571 B1 discloses a foaming nozzle having an elliptical cylindrical shape, coaxially mounted in the front end portion of an injector nozzle. The foam nozzle is designed to spray foam having a transversely elongated strip-like cross-section, suitable for spraying anti-mildew cleaner into the grout lines between tiles. In one embodiment, a pair of baffles protrude a short distance from opposite sides of the outer peripheral wall of the foaming nozzle, causing the foam strip to be thinner in the middle and denser at both ends. Summary of the Invention

[0008] According to the invention, the liquid inlet orifice is adapted to form a liquid jet along the liquid path in the direction of the foam outlet. The liquid inlet orifice defines a main flow direction coinciding with its central axis. The foam nozzle also includes a baffle disposed in the liquid path, wherein the baffle extends in front of the liquid inlet orifice and includes an impact surface. The impact surface intersects the central axis of the liquid inlet nozzle at a first angle, which is an acute interior angle.

[0009] The proposed foam nozzle operates on a completely different principle from existing technologies. In particular, existing nozzles function by forming a conical, diverging liquid jet from an orifice and allowing the jet to interact with a mesh. The conical, diverging jet consists of many smaller droplets, each of which independently interacts with air to form part of the foam that is ultimately distributed through the mesh.

[0010] However, the foam nozzle described herein does not form this type of conical diverging liquid jet from the orifice. In fact, the orifice is adapted to form a liquid jet that diverges in no more than one direction transverse to the main flow direction. Specifically, the liquid jet can be substantially unidirectional, can diverge in at most one direction to form a flat fan shape, and / or can be substantially non-conical diverging. Traveling along a liquid path substantially coinciding with the central axis of the liquid inlet orifice, the liquid jet impacts the impact surface of the baffle. This causes the jet to splash into droplets, which interact with air to form foam. Due to the angle of the impact surface, the jet is deflected, but is allowed to flow towards the outlet along a deflected path toward the foam outlet.

[0011] The advantage of this special arrangement is that it can deliver the desired quality of foam even when the liquid velocity is relatively low. This makes foam nozzles particularly suitable for, for example, continuous or sustained trigger-type ejectors, which typically have lower liquid velocities than conventional trigger-type ejectors. Of course, lower velocities can also be used in conventional trigger-type ejectors to facilitate, for example, metered feeding, reduce the energy required for distribution per unit time, or prevent pressure build-up in the liquid, or for some other reason.

[0012] The liquid inlet orifice can be configured to produce a substantially unidirectional liquid jet, i.e., a jet that is substantially non-divergent and coherent. Alternatively, the liquid inlet orifice can be configured to produce a liquid jet that diverges exactly in one direction transverse to the main flow direction, i.e., a liquid jet with a flat, fan-shaped shape.

[0013] A jet that diverges in no more than one dimension means that the jet itself is one-dimensional or two-dimensional. Therefore, a liquid inlet orifice, alone or in combination with its nozzle, can be configured to form a one-dimensional or two-dimensional jet.

[0014] In both cases, the liquid velocity is relatively high compared to conventional nozzles, which use a three-dimensional, conical spray from the orifice. This increased velocity, combined with the baffles described herein, is believed to enhance foaming performance. It should be noted that the formation of a three-dimensional (e.g., conical) spray pattern can significantly slow down the liquid velocity.

[0015] In some trigger-type injectors, foam is created by using bumps and dents in the area through which the liquid flows (before or after the liquid inlet orifice). These bumps and dents are shaped to cause the liquid to rotate or move more erratically, thereby causing the liquid to disperse. In any case, as described herein, the foam nozzle is configured (in which or on its own, particularly in combination with the cooperating injector head) to form a unidirectional jet, so that the jet does not disperse.

[0016] If the impact surface of the baffle is substantially smooth, relatively uniform spreading of the foam can be achieved over the area where the baffle causes its dispensing. "Smooth" here can be defined as the absence of any channels, grooves, ribs, or other such surface modifications that are conventionally used to induce rotational or erratic movement. Erratic movement can be caused, for example, by surfaces with angular profiles. Therefore, such angular profiles may be absent. The required smoothness can vary depending on the liquid being dispensed; however, those skilled in the art can readily determine whether surface modifications are necessary for each liquid, i.e., whether the interaction with the liquid is effectively modified by locally altering the liquid's direction, or whether the surface is considered smooth.

[0017] The impact surface can be straight along at least a first direction. In principle, the impact surface can also be straight along a second direction perpendicular to the first direction, making it substantially flat. However, it is also possible that the impact surface is curved or angled in this second direction, as will be described below.

[0018] Therefore, a baffle can cause the liquid jet to diverge, but not excessively split into two or more separate jets or sprays. Of course, the baffle can be adapted in other ways to produce this effect. Generally, it is sufficient for the impact surface to be oriented at a defined angle so that the liquid is essentially deflected into a generally divergent but not fragmented foam spray.

[0019] The liquid jet formed by the liquid inlet orifice is relatively narrow. This has the effect that when the liquid leaves the orifice, it is surrounded not by more liquid, but by an open space that is typically filled with air. This increases air-liquid interaction and thus can enhance foaming performance.

[0020] In other words, the liquid jet can move freely toward the baffle and is therefore not slowed down by, for example, the sidewalls of the channel, and in particular, does not encounter conventional flow resistance. After all, when the jet moves through the air, the flow is not properly constrained by the conduits, channels, etc. through which the liquid flows. In any case, as a result of the free movement of the jet, the liquid reaches the baffle at a relatively high velocity, thereby further improving the foaming performance.

[0021] If the nozzle defines a foam chamber into which the liquid inlet orifice leads, and the foam chamber accommodates a baffle and opens at the foam outlet, sufficient space (e.g., filled with air) can be created. The cross-sectional area of ​​the foam chamber can be larger than the cross-sectional area of ​​the liquid jet. This can be determined, for example, by comparing the average diameter of the liquid jet with the characteristic cross-sectional dimensions (e.g., diameter or diagonal) of the chamber in the same plane.

[0022] The impact surface of the baffle can be defined as the surface on which the liquid jet impacts when the trigger-type injector is operated (i.e., when the jet is ejected from the liquid inlet orifice). Generally, the impact surface extends to a certain extent in every direction around the impact area. In particular, the impact surface may extend at least in the direction away from the liquid inlet orifice, as this is the direction in which the liquid will move after impact. In other directions, the impact surface may be less relevant.

[0023] The liquid path is most clearly defined when the liquid leaves the liquid inlet orifice, as it flows directly at the center of the jet produced when the foam nozzle is operated. The liquid path continues to extend until it reaches the baffle, where it is then defined as the geometric center of the resulting foam spray. In general, the liquid path is therefore a combination of at least two substantially straight lines, the first defined by the jet and the second by the liquid after exiting the baffle.

[0024] The liquid inlet orifice defines the main flow direction as coinciding with the axis passing through the center of the orifice. Therefore, the main flow direction is contained within the starting point of the liquid path, at least just after it leaves the liquid inlet orifice.

[0025] In the case of a unidirectional jet, the main flow direction coincides with the starting point of the liquid flow path. In the case of a two-dimensional (e.g., flat fan-shaped) jet, the main flow direction coincides with the geometric center of the jet.

[0026] To further improve foaming performance, the foam nozzle may also include a net at the foam outlet.

[0027] This net can increase air-liquid interaction, thereby forming foam of a more desirable quality. The net can, for example, completely or partially span the foam outlet.

[0028] The net can be arranged at a second angle relative to the impact surface, which is a non-zero interior angle. In one embodiment, the net is oriented perpendicular to the main flow direction. This allows for a relatively compact ejector. The net can also be arranged at an acute angle relative to the impact surface. That is, the second angle can be acute. In particular, the second angle can be chosen to be a right angle, such that the liquid exiting the baffle interacts with it from the oncoming direction, which can increase the effectiveness of the net, for example, by preventing the liquid from being slowed down too much.

[0029] Unless otherwise stated, the angle defined in this application is an angle that can be observed in a longitudinal cross-sectional plane along which the baffle extends, the cross-sectional plane intersecting the liquid inlet orifice and the foam outlet and including the central axis of the orifice.

[0030] In one embodiment, the baffle protrudes from the sidewall of the foam nozzle, and the impact surface extends through the central axis of the orifice. This allows for an elegant design that can be manufactured using mass production techniques such as injection molding.

[0031] The baffle may include a control surface on the side of the impact surface away from the liquid inlet orifice, the control surface being oriented at a third angle relative to the impact surface, the third angle being an obtuse interior angle. The control surface may be connected to the impact surface along the liquid path.

[0032] When liquid impacts an impact surface, it is deflected and begins to travel along that surface. By placing a control surface after the impact surface, the direction of the liquid ejected as foam can be controlled. The third angle can be obtuse or not, but if it is obtuse, the control surface can help redirect the liquid closer to the main flow direction.

[0033] This angle can be defined relative to the control surface, for example, at its free end and / or on the side opposite the impact surface. In principle, it is possible to bend or even angle the control surface between its end at the defined angle and its connection with the impact surface.

[0034] This angle can be selected such that the control surface (preferably at least at its free end) is parallel to the main flow direction.

[0035] As a result, the foam can be guided substantially straight through the foam nozzle, allowing for a relatively compact and / or elegant design. For example, when the liquid inlet orifice is also horizontal (which is often the case in the prior art), the foam can be sprayed horizontally.

[0036] Another method for defining the position of the control surface (which may be an alternative to or supplement to the third angle mentioned above) is to use a fourth angle, which is an interior angle, between the control surface (preferably at least at its free end) and the extension of the impact surface, and the fourth angle is greater than the first angle.

[0037] Therefore, the control surface can be tilted upward relative to the impact surface, thereby increasing the escape angle (tilting upward) as needed.

[0038] If the transition between the impact surface and the control surface is rounded (e.g., to form rounded corners), the control surface can be relatively effective in controlling the direction of liquid flow. Such a smooth transition helps the liquid follow the control surface. Therefore, any smooth transition is naturally covered up.

[0039] The baffle may include an angled edge at its free end, preferably at the free end of the control surface if a control surface is present.

[0040] Angled edges can form the relatively sharp ends of a baffle, which allows the liquid to separate from the baffle and be ejected from the foam outlet. The angled edges prevent the liquid from changing direction at the free edge, thus essentially maintaining the direction given by the control surface.

[0041] An angled edge can be formed, for example, by making the rear part of the baffle angled backward, such that the rear surface of the baffle and the control surface or impact surface meet at the angled edge, which can be an acute angle, such as a fifth angle.

[0042] The impact surface can be curved or angled, preferably curved or angled in the direction transverse to the main flow direction.

[0043] The specific shape of the impact surface in that direction helps to spread the liquid laterally.

[0044] "Transverse" in this document can be defined as transverse to the main flow direction. The vertical direction (perpendicular to the transverse direction) can extend within the previously defined longitudinal cross-sectional plane such that the transverse direction is perpendicular to that plane.

[0045] In the case of forming a two-dimensional jet, it is preferable that the jet spreads out in a fan shape in the lateral direction rather than in the vertical direction.

[0046] Undoubtedly, the orientation of the foam nozzle relative to the horizon is not necessarily relevant to the definition of its components. Therefore, the up and down direction is defined relative to the corresponding component, not relative to the horizon itself.

[0047] To create a relatively compact foam ejector, the bend or angle can be concave.

[0048] On the other hand, the bend or angle can also be convex. A convex bend can help tilt the foam upwards as it leaves the foam outlet.

[0049] Foam nozzles may also include an air supply channel. The air supply channel can facilitate and be configured to supply air to the liquid flowing through the nozzle to enhance foaming.

[0050] Typically, the air supply channel can extend from the outside of the foam nozzle toward the liquid path (e.g., extending into the inside of the foam nozzle), allowing air from the outside to be entrained.

[0051] Air supply channels can be arranged in many ways, but they are most effective when they allow air to interact with the liquid as it impacts the baffle.

[0052] Specifically, the air supply channel can be positioned transversely to the liquid path, as defined above. In this position, air can be entrained by the liquid flow, allowing more air to enter the nozzle for better foaming.

[0053] To allow sufficient air to be present when the jet impacts the baffle, the air supply channel can be positioned upstream of the impact surface, i.e., closer to the liquid inlet orifice than the impact surface, as viewed along the liquid path.

[0054] The air supply channel can be arranged, for example, in the sidewall of the foam nozzle, such as the sidewall forming the foam chamber, but may additionally or alternatively include holes in the baffle. In such cases, there is more freedom in the nozzle design to allow air to enter the channel. In particular, the inlet of the air supply channel can be arranged closer to the foam outlet, or even be part of the foam outlet.

[0055] In the latter case, when the mesh is also present, the air supply channel includes a portion of the mesh. In this embodiment, the foam nozzle is less prone to contamination because it requires at least fewer openings. Additionally or alternatively, the portion of the mesh used to allow air in can have the advantage that the air inlet thus formed is always open. The mesh itself is less likely to become clogged or otherwise contaminated and can be easily or periodically cleaned by the user, and can also be automatically cleaned during foaming.

[0056] In one embodiment, a first distance is defined from the liquid inlet orifice to the free end of the baffle, and a second distance is defined between the free end of the baffle and the foam outlet. The first distance is greater than the second distance, preferably at least 5 times greater, more preferably at least 8 times greater, and most preferably at least 10 times greater.

[0057] The applicant has found that a first distance that is sufficiently large compared to a second distance increases foaming performance. The distances (first and second) can be measured along the main flow direction.

[0058] Foam nozzles can be inserts or attachment parts for attaching to the nozzle head of a trigger-type injector. Therefore, foam nozzles can be manufactured separately from one or more components to attach to the nozzle head. This allows for optimized design for mass production. Furthermore, it allows for the relatively rapid creation of high-performance foam injectors using readily available nozzle designs enhanced with the foam nozzles described herein.

[0059] In one embodiment, the spray head includes a protrusion aligned with the liquid inlet orifice of the foam nozzle in the connected state of the nozzle, the liquid inlet orifice being arranged at a non-zero distance from the protrusion to form a chamber in front of the liquid inlet orifice.

[0060] The protrusion can be used to deliver liquid along the protrusion toward the liquid inlet orifice. By allowing a non-zero distance between the protrusion and the inlet orifice, any turbulence or distortion effects imparted by the protrusion to the flowing liquid can be eliminated or reduced, allowing the liquid inlet orifice to better generate a unidirectional, non-divergent jet. Due to the presence of the non-zero distance, existing nozzles—even those with swirl grooves on the protrusion's head face—can be used with the foam nozzle described herein. The distortion effects of the channel can be fully or largely offset.

[0061] In the connected state, the foam nozzle can be inserted, attached, or mounted to the spray head, or otherwise mounted to the spray head.

[0062] The present invention also relates to a nozzle for use in a trigger-type injector as described above. Furthermore, the present invention relates to a foam nozzle for use in the aforementioned trigger-type injector and / or in the nozzle. The associated advantages discussed above, with necessary modifications, apply to both the nozzle and the foam nozzle. Attached Figure Description

[0063] The invention will be further described with reference to the accompanying drawings, in which:

[0064] Figure 1 schematically shows a cross-sectional view of a prior art spray head with a foam nozzle;

[0065] Figure 2A schematically shows a perspective view of a prior art foam nozzle, and Figure 2B schematically shows a front view of a prior art foam nozzle;

[0066] Figures 3A to 3D Each of the above diagrams illustrates the operating principle of the foam nozzle and the trigger-operated injector currently described.

[0067] Figure 4A and Figure 4B Each schematically illustrates a cross-sectional view of a spray head with a foam nozzle and the foam nozzle itself;

[0068] Figure 5A and Figure 5B Each schematically shows a cross-sectional view of another nozzle with an accompanying foam nozzle and the foam nozzle;

[0069] Figure 6 A variation of the foam nozzle is shown schematically;

[0070] Figures 7A to 7E Further variations of the foam nozzle are illustrated schematically;

[0071] Figures 8A to 8D Each schematically illustrates a cross-sectional view of a variant of the foam nozzle, with measurements indicated.

[0072] Figures 9A to 9E Each schematically illustrates a cross-sectional view of further variations of the foam nozzle; and

[0073] Figures 10A to 10B Each schematically illustrates a cross-sectional view of a further variation of the foam nozzle. Detailed Implementation

[0074] In all the accompanying drawings, the same elements are referred to by the same reference numerals. Unless otherwise stated, similar elements in different embodiments, examples or variations are referred to by the same reference numerals incremented by one hundred (100).

[0075] Figure 1 shows a portion of a trigger-type injector 1 having a nozzle 4 and a foam nozzle 7 connected thereto, both of which are known in the prior art. The nozzle 4 includes a threaded component 2 for connection to a reservoir (not shown) (such as a bottle, can, or other type of container). A suction tube 3 is provided to extend into the container and draw liquid for dispensing. A pump mechanism 6 is operated by a trigger 5 to cause liquid to move through the suction tube 3 into the foam nozzle 8. The pump mechanism 6 is not described in detail because many different pump systems are known and can be combined with the present disclosure. In the nozzle 4 shown, there is a protrusion 8 for the liquid to flow around and along the protrusion before reaching the liquid inlet orifice 9 of the foam nozzle 7. The liquid is ejected from the liquid inlet orifice 9 through the foam outlet 10.

[0076] The prior art foam nozzle 7 can operate in one of two ways, as shown in more detail in Figures 2A and 2B. Figure 2A shows a nozzle with a rotating groove 11 at the end face of its protrusion 8. The rotating groove is supplied with liquid by an inlet channel 98 along the protrusion 8 and leads into a rotating chamber 99. The liquid forced to flow along the protrusion 8 enters the rotating groove 11 and acquires rotating, and sometimes turbulent or chaotic, characteristics in the rotating chamber 99, causing the liquid to exit the foam nozzle 7 in the form of a cone-shaped, diverging spray, but simultaneously mixing with air in the conduit portion 12 of the foam nozzle 7 to form foam. For sufficient foaming performance, a nozzle configured in this way requires a relatively high liquid flow rate. Otherwise, the rotating and / or turbulent or chaotic motion would not result in adequate mixing with air, as it would not sufficiently break the liquid into droplets.

[0077] Another example foam nozzle 7' (using apostrophe reference numerals for similar elements) is shown in Figure 2B. Figure 2B is a rear view of nozzle 7', without protrusions. This makes four specifically shaped bodies 13 inside the nozzle visible, defining a rotating channel 14 between them that guides the liquid entering nozzle 7' inward into a rotating chamber 99'. From there, the liquid exits the rotating chamber 99' through a liquid inlet orifice 9' to form foam. The result is a turbulent jet that mixes with air and exits the inlet orifice 9' as a three-dimensional cone-shaped spray. Like the example in Figure 2A, this configuration requires a relatively high liquid velocity.

[0078] Figure 3AThe principle used in this disclosure for forming foam jets is illustrated. Generally, a liquid jet 16 is formed. The liquid jet can be unidirectional, i.e., substantially non-divergent, or it can be two-dimensional, i.e., divergent in one direction but not in another, thus forming a substantially flat fan-shaped form. The housing 15 is shown in cross-section, but it is visible that the jet 16 does not contact the wall of the housing 15. In fact, the housing 15 is much wider than the jet 16, so the jet can flow downwards along the housing 15 (in... Figure 3A (In the middle) it moves without losing too much speed. Further down, the housing 15 forms a baffle 17 on which the liquid impacts. The impact causes the liquid to disperse to the left as a foam spray 19. In this example, although not strictly necessary, an air passage 18 is provided upstream of the baffle 17 so that air can be drawn in to interact with the jet during and after the impact. Figure 3B A top view of the same configuration is shown, which makes it clearer that the baffles cause the foam spray 19 to spread horizontally, i.e., in a fan shape.

[0079] In principle, it is possible to use, such as Figure 3A and Figure 3B The unidirectional, non-scattering jet 16 is shown. However, a jet 16' in a flat, fan-shaped form can also be used, i.e., a jet that diverges in one dimension but not in another. Figure 3C and Figure 3D This is illustrated in the top view of the nozzle, which may or may not have a protrusion 50 similar to protrusion 8, but it includes a liquid inlet orifice 52 in the wall 51. The channel width w of the liquid inlet orifice is much greater than the channel height h. The channel height h can be... Figure 3D Observed in a cross-sectional side view. As shown, nozzle 52 causes the jet 16' to be in the lateral direction (see Figure 16). Figure 3C ) unfolds, but in the vertical direction (see Figure 3D The jet does not diverge. Therefore, a two-dimensional jet 16' is formed. The jet 16' impacts the baffle 17', which is, in principle, similar to... Figure 3A and Figure 3B The baffle 17 causes foaming to occur. Of course, it is possible to use any suitable technique to form the jet, rather than the technique shown herein.

[0080] Figure 4A A trigger-type injector 101 similar to that of Figure 1 is shown, but it incorporates features of the present invention. Figure 4A and Figure 4B The accompanying figures show cross-sections of the spray head and foam nozzle, with only the most important components shaded. Figure 4A The difference between the spray head 104 and the spray head in Figure 1 is that it has an alternative foam nozzle 107. The foam nozzle 107... Figure 4B It is shown in more detail below.

[0081] Figure 4B A foam nozzle 107 is shown, having a liquid inlet orifice 109 and a foam outlet 110. The foam nozzle 107 is positioned around a protrusion 108, but the liquid inlet orifice 109 is positioned at a distance 121 from the protrusion 108. The distance 121 is not strictly required, but helps to avoid rotational effects, such as those caused by the shape of the protrusion 108. In the example currently shown, a protrusion 108 with a rotation chamber 199 is used. However, due to the distance 121, the rotational effect caused by the protrusion 108 is eliminated or reduced. As a result, the liquid inlet orifice 109 forms a better, essentially unidirectional liquid jet. Because the liquid jet is unidirectional, it corresponds to the main liquid flow direction 122, which in turn coincides with the central axis A of the liquid inlet orifice 109. After leaving the liquid inlet orifice 109, the jet follows the main flow direction 122 along the liquid path. A baffle 120 is positioned in the liquid path in front of the orifice. The baffle is oriented at a first angle α (see later figure) relative to the main liquid flow direction 122 and intersects the central axis A at this first angle α. The first angle α is an acute interior angle. The liquid jet impacts the baffle 120 at its impact surface 131. After impact, the liquid spreads out and generally moves along the baffle 120 toward its free end toward the foam outlet 110. Simultaneously, due to the impact, the jet is broken into droplets, which interact with air to form foam. The foaming is then enhanced using a net 124 spanning the foam outlet 110.

[0082] Downstream of the impact surface 131, along the baffle 120, a control surface 132 is arranged. The control surface 132 (at least its portion at the free end of the baffle 120) forms an angle with respect to the impact surface 131. The transition between the impact surface 131 and the control surface 132 is rounded to form a fillet, but it can generally be smooth, thus exhibiting a bend 135. The control surface 132 causes the liquid to bend upwards (e.g., as...). Figure 4B As shown), because it tends to follow the surface of control surface 132. Therefore, the liquid path continues in a slightly horizontal direction 123 after the control surface. Of course, because the liquid is now foaming, and because it has already impacted the baffle 120, the spray is much more dispersed than before the impact. Therefore, the liquid flow path 123 is not very well defined, but at the geometric center of the foam form, it can be influenced by control surface 132 as desired, for example, by bending control surface 132 upward relative to impact surface 131. The orientation of control surface 132 can be defined using the angle β between control surface 132 and impact surface 131, as will be shown later. Figure 4A and Figure 4BIn the example shown, angle β is an obtuse interior angle, but other angles can also be chosen. In the example currently shown, control surface 132 is parallel to the main flow direction 122. However, it is also possible to point control surface 132 further upward (e.g., Figure 8C (As shown).

[0083] By angled rearwards at the rearwards of the baffle 120, the liquid is separated from the baffle 120. The rearwards 133 engages with the control surface 132 at an angled edge 134, causing a relatively abrupt change in the shape of the baffle, which the liquid does not readily follow. As a result, the liquid separates and continues to flow toward the foam outlet 110. The angled edge 134 can also be provided without the control surface 132 by having the impact surface 131 and the rearwards 133 engage at the angled edge 134.

[0084] The foam nozzle 107 is made of two separate parts for injection molding. The first part is a base part 126, which is connected to the injection head 104 by extending over the protrusion 108 of the injection head 104. A front part 125 is then placed inside the base part 126. The base part 126 defines a liquid inlet orifice 109 in this case, while the front part 125 defines a baffle and a foam outlet 110. The front part 125 is substantially tubular in this case, although this is not necessary, and the baffle 120 protrudes from the sidewall of the front part 125 into the liquid path.

[0085] The foam nozzle 107 also includes an air supply passage 127, which, in this case, is arranged upstream of the impact surface 131. The air supply passage 127 is arranged in the sidewall of the base member 126 and is not obstructed by the front member 125. Of course, the air supply passage 127 could be arranged elsewhere, but it is advantageous if it allows air to flow from the outside toward the jet at or near the liquid inlet orifice 109, or at least upstream of the baffle 120. It is possible to arrange the supply passage transverse to the jet, but it can be placed anywhere radially away from the main flow direction 122.

[0086] Foam nozzle 107 essentially defines a foam chamber into which liquid inlet orifice 109 opens. Baffle 120 is placed within the chamber, and the chamber leads to foam outlet 110. The foam chamber has a relatively large cross-sectional area relative to the jet before impact. Therefore, air is present around the jet, allowing interaction between the two.

[0087] Figure 5A and Figure 5B It shows something similar to Figure 4A and Figure 4BThe trigger-type injector 201 and the foam nozzle 207. For the sake of brevity, only the differences will be described. Unlike conventional trigger-type injectors, Figure 5A The trigger-type injector 201 is of the continuous type, meaning that it can form a continuous jet when operated repeatedly. For this purpose, the trigger-type injector 201 includes: a trigger head 204 having a trigger 205, the trigger 205 operating a pump mechanism 206; and a body 202 connectable to a container (not shown). A suction pipe 203 is also provided. Most importantly, the trigger head 204 includes a buffer device 230 in which liquid can be contained under pressure to allow continuous jetting. The exact operation of the trigger-type injector 201 is not described in detail, as several types of continuous jet injectors are known from the prior art, and they can be combined with the foam nozzle 207 described herein as needed. The foam nozzle 207 itself (see...) Figure 5B The details are also similar Figure 4B The foam nozzle, in addition to having an extension 243 for cooperating with the spray head 204, also has an air supply channel 227 located directly behind the liquid inlet orifice 209, laterally to the side.

[0088] However, it should be noted that there is considerable freedom in the design of foam nozzles. Therefore, variations that can be applied in all examples are shown below. Figure 6 The previously presented variant elements in this figure are indicated using the same reference numerals with a letter suffix. First, it is shown... Figure 5B Foam nozzle 207 ( Figure 6 (The two images on the left). Arrow V in the leftmost image indicates the view axis direction of the right-hand image, where nozzles 207 (A to C) are shown without mesh 224. Foam nozzle 207 has a planar impact surface 231 of baffle 220 (as seen when viewing nozzle 207 from the front). However, planar surface 231 can be rotated about the main flow direction, as shown in variants 207A, 207B, and 207C. Each orientation will allow the foam to exit foam outlet 210 slightly differently, making the design of foam nozzle 207 relatively flexible.

[0089] Other variations (which can also be applied to all the examples shown in this article) are shown in Figures 7A to 7E In these figures, the previously presented variations of elements are indicated by the same reference numerals plus a letter suffix. Although in its simplest form ( Figure 7A The impact surface 231 is planar (i.e., flat), but it is still possible for the impact surfaces 231A and 231B to be bent, making either 231A concave or 231B convex, respectively. See [reference needed] for details. Figure 7B and Figure 7C . Figure 7D and Figure 7EBoth show that the impact surfaces 231C and 231D are angled, either convex 231C or concave 231D.

[0090] Figure 8A A foam nozzle 307 is shown, which is related to... Figure 5B It is the same as the foam nozzle, but without the extension 234 of the foam nozzle. Figure 8A This is used to illustrate some dimensions that may and have been used in the examples of this application. For an explanation of the features of the foam nozzle 307, please refer to... Figure 5B and Figure 4B The description. Figure 8A A first angle α, an acute interior angle, is shown between the impact surface 331 and the main flow direction 322. A second angle β spans between the impact surface 331 and the mesh 324, and is also an acute interior angle. If the mesh 324 is not provided, the second angle β can be defined relative to the plane of the foam outlet. A third angle γ indicates the angle between the control surface 332 and the impact surface 331. Finally, a fourth angle δ indicates the angle between the control surface 332 and the extension of the impact surface 331, also as an acute interior angle. The liquid inlet orifice 309 has a diameter defined as o. Other dimensions include the diameter d of the foam outlet 310, the height y of the baffle 320 extension, a first distance L1 measured between the liquid inlet orifice 309 and the free end of the baffle 320, and a second distance L2 measured between the free end of the baffle 320 and the foam outlet 310. The first distance L1 is greater than the second distance L2. These measurements will be referenced in the embodiments, where appropriate values ​​will be shown.

[0091] Now it will be done by only indicating relative to Figure 8A Explain the differences of the foam nozzle 307 Figure 8A A variant of the foam nozzle 307.

[0092] Figure 8B A foam nozzle 407 is shown, which is related to... Figure 8A The foam nozzle is the same, except that the control surface 432 and the impact surface 431 now meet at the edge 435 instead of at the bend.

[0093] Figure 8C A foam nozzle 507 is shown, which is related to... Figure 8A The foam nozzle is the same as the control surface 532, except that the control surface 532 is angled upwards, such that the fourth angle δ is greater than the first angle α. This causes the foam to exit the foam outlet 510 in a more upward direction. An angle ε is also defined between the control surface 532 and the rear side 533 of the baffle 520. The bend between the control surface 532 and the impact surface 531 is indicated by the letter r.

[0094] Figure 8DA foam nozzle 607 is shown, which is related to... Figure 8A The foam nozzle is the same, except that it lacks a control surface. Instead, the impact surface 631 remains unchanged until the free end of the baffle 620. This causes the foam to exit relatively low from the foam outlet.

[0095] like Figure 9A As shown, even more variations are possible. The figure illustrates a solid baffle 720 with a body 736 to form a relatively robust baffle 720 that can exhibit predictable dynamic behavior when impacted by a jet. In this example, there is no air inlet channel, a variation that can be applied alone or in conjunction with the solid baffle 720 with body 736 to other variations. The body 736 protrudes from the sidewall of the foam nozzle 707 and has a front portion 737 and a rear portion 738, both of which are outside the liquid flow path. The body extends between the front portion 737 and the rear portion 738 and completely fills the space, forming an impact surface 731.

[0096] refer to Figure 9B It should be noted that the air inlet channel 827 can also be fabricated in, for example, the front part 825 of the foam nozzle 807. The base part 826 in this case can present a solid wall 840 without any perforations or recesses, as these are not necessary for forming the air supply channel 827. As another variation, in this example, the front part 825 is positioned above the base part 826, rather than inside the base part 826. This indicates that, in general, even in other variations, the front part 825 and the base part 826 can be attached in any suitable manner, such as one inside the other or vice versa. These variations are independent of the location of the air supply channel 827. Similarly, the bend between the impact surface 831 and the control surface 832 is replaced by an edge 835. This also applies to the following description. Figures 9C to 9E .

[0097] refer to Figure 9C It should be noted that the air supply passage 927 may also be formed by a suitable groove in the sidewall of the front member 925 and the base member 926, or both (although the latter is not shown). In any case, it is not necessary to make holes in the members 925, 926 themselves, but the air supply passage 927 allows air to pass between the front member 925 and the base member 926 (see A). Figure 9C As an alternative to this variant, the air supply channel can also be installed in the baffle, such as... Figure 9DAs shown. Here, a hole 927' exists in the baffle 920', which allows air to travel upwards towards the baffle 920'. The air can come from the upper part 941' of the foam outlet 910', regardless of whether it is equipped with a mesh 924'. In both cases, the front parts 925, 925' are positioned above the base parts 926, 926'.

[0098] refer to Figure 9E It should be noted that the foam nozzle 1007 can have any suitable shape. In this figure, it is shown that the centerline of the foam outlet 1010 can be offset from the main flow direction 1022 by a distance L3, allowing more space for foaming and enabling the foam to exit approximately at the center of the foam outlet 1010. A similar approach is provided. Figure 9C Air inlet channel 1027. Similarly, front component 1025 is disposed above base component 1026.

[0099] Figure 10A and Figure 10B An angled variation of the foam nozzles 1107 and 1207 is shown, such that the outflow directions 1144 and 1244 form a non-zero angle ζ relative to the main flow directions 1122 and 1222. This is achieved by forming angles 1143 and 1243 in the front components 1125 and 1225. Figure 10A In the middle, the baffle 1120 is oriented such that its impact surface 1131 is parallel to the outflow direction 1144, while Figure 10B In the middle, it remains slightly tilted downwards to increase the first angle α. The injection direction is controlled by a control surface 1232 set to a fourth angle δ.

[0100] Example

[0101] Manufacturing using 3D printing Figure 8A The foam nozzle was used. Tests showed the expected foam performance. The foam was dry and relatively dense.

[0102] The dimensions of the foam nozzle are as follows:

[0103] First distance L1: 6.6 mm

[0104] Second distance L2: 0.5 mm

[0105] Height y: 1.8 mm

[0106] Diameter d: 4.5 mm

[0107] Orifice o: 0.28 mm

[0108] Bending radius: 2 mm

[0109] First angle α: 25°

[0110] Second angle β: 65°

[0111] Third angle γ: 155°

[0112] Fourth angle δ: 25°

[0113] These dimensions can be particularly desirable depending on the liquid to be dispensed as foam. However, foam nozzles are also expected to operate under the following conditions.

[0114] The first distance L1 can be between 2 mm and 20 mm, preferably between 5 mm and 10 mm, more preferably between 6 mm and 10 mm, such as about 6.6 mm.

[0115] The second distance L2 can be between 0.1 mm and 10 mm, preferably between 0.3 mm and 5 mm, more preferably between 0.3 mm and 1 mm, such as about 0.5 mm. As defined above, the second distance L2 can be smaller than the first distance L1.

[0116] The height y can be greater than 1 mm, preferably greater than 1.5 mm, such as about 1.8 mm. A suitable upper limit can be selected, such as 2 mm, 5 mm or even 10 mm.

[0117] The diameter d can be between 2.5 mm and 25 mm, preferably between 4 mm and 15 mm, more preferably between 4 mm and 10 mm, such as about 4.5 mm.

[0118] The size of the orifice o can be between 0.10 mm and 1.5 mm, preferably between 0.20 mm and 1.0 mm, more preferably between 0.25 mm and 0.5 mm, such as about 0.28 mm.

[0119] The radius r can be greater than 0 mm, such as greater than 1 mm, preferably about 2 mm, or even larger.

[0120] The first angle α can be between 5° and 75°, preferably between 15° and 50°, more preferably between 20° and 30°, such as about 25°.

[0121] The second angle β can be the difference between 90° and the first angle α, and / or can be between 10° and 100°, preferably between 30° and 80°, such as about 65°.

[0122] The third angle γ can be the difference between 180° and the first angle α, and / or can be between 100° and 200°, preferably between 130° and 170°, such as about 155°.

[0123] The fourth angle δ can be between 5° and 75°, preferably between 15° and 50°, more preferably between 20° and 30°, such as about 25°.

[0124] The fifth angle ε defining the position of the rear surface of the baffle can be less than 120°, preferably less than 100°, such as less than 90°. The fifth angle ε can be greater than 0°.

[0125] The present invention is not limited to the embodiments, examples, and variations shown, but extends to other embodiments falling within the scope of the appended claims. Therefore, it should be understood that variations shown together or separately can also be combined with other variations as covered by the appended claims.

Claims

1. A trigger-operated foam sprayer, preferably of the persistent or continuous spray type, said sprayer comprising: - A reservoir for holding the liquid to be foamed; as well as - A nozzle, connected to the reservoir, the nozzle comprising: - A foam nozzle, the foam nozzle being used to form foam of the liquid as the liquid is ejected through the nozzle; as well as - A pump mechanism and a trigger for operating the pump mechanism, wherein operation of the trigger causes the pump mechanism to eject liquid from the reservoir through the foam nozzle. The foam nozzle has a foam outlet and a liquid inlet orifice spaced a distance from the foam outlet, for forming a liquid jet along a liquid path in the direction of the foam outlet. The liquid inlet orifice defines a main flow direction coinciding with the central axis of the orifice. The foam nozzle further includes a baffle disposed in the liquid path, wherein the baffle extends in front of the orifice and includes an impact surface that intersects the central axis of the orifice at a first angle, the first angle being an acute interior angle.

2. The trigger-type injector according to claim 1, wherein the foam nozzle further includes a mesh at the foam outlet.

3. The trigger-type injector according to claim 2, wherein the mesh forms a second angle with respect to the impact surface, the second angle being a non-zero interior angle.

4. The trigger-type injector according to any one of claims 1 to 3, wherein the baffle protrudes from the sidewall of the foam nozzle, and wherein the impact surface extends through the central axis of the orifice.

5. The trigger-type injector according to any one of the preceding claims, wherein the baffle includes a control surface on the side of the impact surface away from the liquid inlet orifice orientation, the control surface being oriented relative to the impact surface at a third angle, the third angle being an obtuse interior angle.

6. The trigger-type injector according to claim 5, wherein the control surface is preferably parallel to the main flow direction, at least at its free end.

7. The trigger-type injector according to claim 5, wherein the fourth angle is greater than the first angle, and the fourth angle is preferably an interior angle between the control surface and an extension of the impact surface, at least at its free end.

8. The trigger-type injector according to any one of claims 5 to 7, wherein the transition between the impact surface and the control surface is rounded.

9. The trigger-type injector according to any one of the preceding claims, wherein the baffle includes an angled edge at its free end, preferably, if a control surface is present, an angled edge at the free end of the control surface.

10. The trigger-type injector according to any one of the preceding claims, wherein the impact surface is curved or angled, preferably curved or angled in a direction transverse to the main flow direction.

11. The trigger-type injector of claim 10, wherein the bend or angle is concave.

12. The trigger-type injector of claim 10, wherein the bending or angle is convex.

13. The trigger-type injector according to any one of the preceding claims, wherein the foam nozzle further includes an air supply channel.

14. The trigger-type injector of claim 13, wherein the air supply passage is positioned transverse to the main flow direction.

15. The trigger-type injector according to claim 13 or 14, wherein, when viewed along the liquid path, the air supply channel is arranged upstream of the impact surface.

16. The trigger-type injector according to any one of claims 13 to 15, wherein the air supply passage includes a hole in the baffle.

17. The trigger-type injector according to any one of claims 13 to 16, comprising the mesh of claim 2, wherein the air supply passage includes a portion of the mesh.

18. The trigger-type injector according to any one of the preceding claims, wherein a first distance is defined from the liquid inlet orifice to the free end of the baffle, and wherein a second distance is defined between the free end of the baffle and the foam outlet, and wherein the first distance is greater than the second distance, preferably at least 5 times greater, more preferably at least 8 times greater, and most preferably at least 10 times greater.

19. The trigger-type injector according to any one of the preceding claims, wherein the foam nozzle defines a foam chamber, the liquid inlet orifice opens into the foam chamber, and the foam chamber accommodates the baffle and is open at the foam outlet.

20. The trigger-type injector according to any one of the preceding claims, wherein the foam nozzle is an insert or attachment member for attaching to the nozzle head of the trigger-type injector.

21. The trigger-type injector according to any one of the preceding claims, wherein the injector head includes a protrusion aligned with the liquid inlet orifice of the foam nozzle in the connected state of the nozzle, the liquid inlet orifice being arranged at a non-zero distance from the protrusion to form a chamber in front of the liquid inlet orifice.

22. An injection head for use in a trigger-type injector according to any one of the preceding claims.

23. A foam nozzle for use in a trigger-type injector according to any of the preceding claims and / or for use in an injector head according to claim 22.

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