A whirlpool jet

Abstract: The invention concerns a whirlpool jet (1) which can be fixed to a bathtub (2) and provided with water and air supply pipes (1a,1b) under pressure, characterized by a valve (30) with a central protrusion washed by the water on its external surface (31), opening in a centre air flow hole (35) and pushed by a spring (36) into a normally closed position, in contact on its external surface (31) and that of the centre hole (35), respectively with the end of a pipe (18) through which the mixture of air-water is discharged, and the end (29) of a rod (28) on the axis of said pipe (18).

Description: The invention refers to a whirlpool jet. It is common knowledge that a whirlpool system consists of a standard bathtub with jets on the sides supplied by piping including a pump which draws water from the bathtub filled from standard tap fittings, to produce a jet of water after having mixed the same with air supplied from the room. Since bathtubs with whirlpool system are also used as normal bathtubs, it is important from a hygienic point of view, for the jets to prevent infiltration of water into the piping of the system when the system is not used, as well as to ensure complete drainage of the water at the end of each whirlpool cycle, in order to prevent the formation of backwater mixed with detergents and skin fats, which may be polluting and lead to the formation of mould and bacteria which would then be recirculated. From a functional point of view, it is important for the jet, when it penetrates the water mass, to trap the air bubbles which have been mixed in the same, because this is essential for producing the massaging and oxygenating action on the skin of the user. All the jets designed to date do not fully meet all these requirements: in some cases, the water passes from the bathtub to the whirlpool system piping, in other cases backwater tends to form after each whirlpool cycle; moreover, because of the fact that the bubbles of mixed air are produced only in a surface layer, the jet of water can not keep the bubbles during penetration of the water mass in the bathtub. Patent EP-A-0311967 describes a whirlpool nozzle consisting of a first sleeve and a jet generator mounted on an orientable spherical body and containing an axially movable nozzle, actuated by an external actuator, said nozzle being retracted under the control of said external actuator so as to leave a passage space for the water jet. Said nozzle consisting of a non return valve adapted to permit the flow of water from inside to outside the nozzle but not vice versa, thus acting as a check valve to prevent the back flow of water from a tub served by said nozzle to the air piping; said nozzle co-operating with the above sleeve to prevent, in the extended position, the back flow of water from said tub to the water circulation circuits of the nozzle. The purpose of this invention is to realise a nozzle whose air and water hole is opened or closed by the same valve. An additional purpose of this invention is to realise a nozzle whose air and water hole closing valve automatically opens not by means of an external actuator as described in patent EP-A-0311967 but by means of the water pressure on the body of the valve that is strong enough to overcome the antagonistic force of the spring that keeps the valve in normally closed position until the water is circulated by the pump. The purpose of this invention is to design a jet for whirlpool systems which prevents water from filtering from the bathtub into the piping of the system when the same is not in use, and which creates a jet of air-water which can hold the air bubbles until they reach the skin of the user. One of the purposes of this invention is to design a jet which ensures complete drainage of the water at the end of each whirlpool cycle, in order to ensure a high level of hygiene and to make it possible to realize non standard functions, such as pushbutton jets, which may be used for therapeutic purposes. Another purpose of this invention is to provide a jet with stable operation, without vibrations and oscillations and which permits full adjustability of the jets in all directions while being compact and easy to mount and dismount, even when replacing single components. The objective as well as the purposes indicated are attained by means of a whirlpool jet according to the invention as defined in claim 1, which can be fixed on the walls of a bathtub fitted with water and air supply pipes under pressure including a valve having a centre projection which is washed by water on its external surface and opening into a centre air flow hole, pushed by a spring into a normally closed position, said external surface being in contact with the end of a pipe for discharging a jet of air-water and being in contact on the surface of the centre hole with the end of a rod in the axis of this pipe. The whirlpool jet according to the invention offers the following advantageous features: a structure which can be fixed to the wall of a bathtub consisting of a pipe fitted at the bottom which connects to a supply pipe of water under pressure and a top pipe fitting communicating with an air supply pipe and directly with the atmosphere; a body consisting of two hollow hemispherical covers connected to each other so as to allow a peripheral communication space with the exterior in the case of the cover facing the interior of the bathtub, which has a pipe for a jet of the water-air mixture having a rod on the axis, and in the case of the cover facing the exterior of the bathtub having a central space communicating to the exterior, said body being housed so that it can rotate in a section of the space within said structure in that internally it communicates at the level of the peripheral space between the covers with the water supply pipe and at the level of the main space in the cover facing the exterior of the bathtub with the air pipe; a valve shaped according to a curved wall with the concavity turned to the exterior positioned in the cover turned towards the exterior of the bathtub so as to communicate at the level of the concave surface with the water and at the level of the convex surface, with the air; said curved wall being open at the centre with a hole which is substantially aligned with the centre space in said cover, and having a spring fitted between said cover and valve in order to push the valve into a normally closed position with the external concave surface in contact with the end of the output pipe of the jet in the cover facing the interior of the bathtub so as to stop the passage of the water, and with the internal surface of the hole in contact with the end of the rod in said pipe so as to stop the air flow. Additional advantages and characteristics will be illustrated in the description of two preferred but not exclusive embodiments of the invention, given for purposes of illustration and not in a limiting sense in the attached drawings whereby: figure 1 is a cross-section of the invention with the whirlpool not in operation; figure 2 is a cross-section of the invention with the whirlpool operating; figure 3 is a cross-section of the invention showing a variant on the air supply fitting, with the body inside the structure rotated with respect to the position shown in the previous figures; figure 4 is a blow-up of the sections of some of the parts in the body in the structure. fig. 5 illustrates an alternative embodiment of the above valve, placed in the hemispherical covers. With reference to the above figures 1,2 and 4, 1 illustrates the overall structure which can be fitted to the wall 2 of a bathtub by means of the ring nut 3 screwed on the same and consisting of the pipe 1a fitted at the bottom which connects to a supply pipe of water under pressure, not illustrated in the figures, and the top pipe fitting 1b having a closed cap 4 which prevents direct contact of said pipe fitting with the atmosphere but allows the same to communicate with air supply pipe 5 which originates from an adjustable room air intake, not shown in the figure. 6 illustrates a body which can be rotated in a section of space within the structure 1 delimited also by cover 7, which is screwed to the ring nut 3 in order to remove said body when necessary for maintenance; the gaskets 8 and 9 prevent unwanted water leaks, as described more fully in the operating description. Before continuing with the detailed description of body 6, it is important to mention the screen 10 fixed on to the ring nut 3 with gasket 10a, which customizes the jet. As far as the body 6 is concerned, the same consists of two hollow hemispherical covers, namely a cover 11 turned towards the exterior of the bathtub and a cover 12 turned towards the interior of the bathtub, connected reciprocally by means of clip appendixes 13 formed in a single block, suitably spaced, from cover 11, in order to fix by elastic deformation into corresponding housings in cover 12 close to the tabs 12a whose purpose is to reduce the tangential component of the water flow entering the body 6; the length of said appendixes being such as to create a peripheral flow space 14 between the covers. Cover 11 has a centre space 15, and an important feature of the invention is that the housing of body 6 within the structure 1 is realized so that the interior of the body communicates at the level of the peripheral space 14, by means of a section of space 16, with the water supply pipe 1a, and at the level of the centre light 15 of cover 11 by means of the section of space 17, with the air pipe fitting 1b. Cover 12 has a output pipe of the air-water jet indicated as a whole with 18, which includes the cylindrical element 19 joined by means of threading 20 with an appendix of the cover 12 realized in four sections 21, 22 and 23 in order to allow an elastic deformation to block said element 19 as a result of the peripheral projection 24 of the same striking against teeth 25 obtained from said sections; the gasket 19a prevents unwanted water leaks. The exterior end of the cylindrical element 19 has the ring nut 26 blocked by elastic deformation by means of the tooth 26a, which not only gives the jet a high quality appearance but also supports the pipe fitting 18 in a coaxial position by means of the tabs 27, the rod 28 having an elongated shape in order to form a jet having no contractions when it exits the pipe 18 in that within the body 6 there is an elastically pliable mushroom shaped end 29 made of elastic material such as rubber. Inside the body 6, namely in the cover 11, there is a valve 30 consisting of a rotating solid according to a curved wall, and positioned so as to provide a contact on its external concave surface 31 with the water and on its internal convex surface 32 with the air, as will be illustrated in the operating description. Said valve which is in sliding contact on the periphery with the cylindrical surface of the guide 33 in the cover 11 with radial tabs 34 so to provide a sliding contact with the internal surface of the pipe fitting 18 forming guide in the movements of the valve, has its curved wall open at the centre in hole 35 being substantially aligned with the centre space 15 of cover 11. It should be noted that said curved wall is shaped to have a tangent on the periphery being substantially perpendicular to the axis of pipe fitting 18 and at the centre hole 35 being substantially parallel to said axis. Finally, 36 represents a spring fitted between the cover 11 and the valve 30, which pushes the same into a normally closed position, as shall be illustrated in the operating description, with the exterior concave surface 31 in contact with the end surface 19b of the cylindrical element 19 included in the output pipe fitting 18 of the jet, in order to stop the water flow, and with the internal surface of the hole 35 in contact with the end 29 of the rod 28, so as to stop the air flow. The simultaneous contact of the above mentioned surfaces is ensured by the elastic pliability of the end 29, which also allows adaptations in the position of the valve 30 so as to ensure the complete contact between the surface 31 of said valve and the end surface 19b of the pipe fitting 18 which are shaped so as not to require seal gaskets and, according to an important feature of the invention, are shaped to form a pipe fitting between them for the water flow when the valve is open, and having gradually decreasing segments, at the front. With reference to figures 1 and 2, an operating description of the invention is provided. Figure 1 illustrates the situation which occurs when the bathtub is full of water, shown in the figure by the broken horizontal lines, and the system whirlpool pump is not operating: this is the situation which occurs when the bathtub is used as a normal bathtub, namely once the bathtub has been filled, as a preliminary condition before actually starting the whirlpool. In this situation the action of the spring 36 on the valve 30 pushes the same into a double contact with the end surface 19b of the pipe fitting 18 and with the end terminal 29, so that thanks to all the above mentioned gaskets, water is prevented from flowing from the bathtub into the whirlpool system piping, thereby satisfying the essential objective of the invention. When the whirlpool system pump is started, the situation illustrated in figure 2 occurs whereby the filiform broken line shows the water threads and the circles indicate the air. The water which is supplied under pressure from the pipe 1a moves through the space 16 into the peripheral space 14 of the body 6 and contacts the exterior concave surface 31 of the valve 30, moving the same into an open position, and overcoming the action of the spring 36 thanks to three different reasons being firstly the pressure of the water, secondly the impulse deriving from the variation of the flow quantity consequent to the variation in the direction of the water speed, which from its position perpendicular to the axis of the output pipe fitting 18 moves into a position parallel to said axis, and finally the power due to the acceleration of the water mass inside the pipe which occurs in contact with the open valve 30 and which has, as mentioned previously, a gradually decreasing cross-section. For all these reasons, the possible oscillations in water pressure are not felt, as in the case of standard jets, and therefore there is no operating instability and vibrations of the valve which negatively affect the quality of the jet. The movement of the valve 30 into the position illustrated in figure 2 not only causes the water pipe to open between the external surface 31 of the valve and the end surface 19b of the pipe 18, but also opens a pipe fitted between the surface of the hole 35 at the centre of the valve and the end piece 29, so that through this pipe by a Venturi effect determined by the incoming water speed the air is drawn by line 5 by means of the pipe fitting 1b, the section of space 17 and the input space 15 in the cover 11. The mixing of the two fluids occurring with the entry of the air in the central area of the pipe 18, creates a jet of water-air escaping from said pipe in which the air is broken into very small bubbles which are perfectly trapped in the water mass and which will therefore be held within the jet until this strikes the skin of the user, thereby creating an efficient massaging and oxygenating action. It should be noted that the breaking up of the air and trapping of the same within the jet is considerably increased by radial tabs 34 on the wall 31 of the valve 30 which not only guide the valve during its movements, but also divide the incoming water current into very fast jets which, with respect to the annular shaped jet which would be created without these tabs, have a greater surface area, major turbulence and are less compact, thereby creating ideal conditions for trapping the air. When the whirlpool system pump stops, water is no longer supplied under pressure on the valve 30 which is immediately taken by the spring 36 into its closed position, and thanks to the shape of the jets which are designed with the water pipe in the lowest area and the fact that there is free access towards the pipe of all the areas occupied by the water before the sections which are to be blocked by said valve, it is possible to drain all the water in the jets and in the whirlpool system piping when the bathtub is emptied at the end of the cycle, with no backwater being formed which could lead to pollution as described above. With reference to figure 3, an alternative version of the invention is described; it can be noted from the jet illustrated in this figure, that its structure 1 is unchanged and that it has the same pipe 1a and pipe fitting 1b and the body 6 and all its components are the same; regarding said body 6, the figure illustrates that the same can be rotated in a different way with respect to figures 1 and 2, in order to allow different directions of the jet projecting from pipe fitting 18. The version involves the air pipe 1b in which there is a cap with holes 37 having a pipe 38 communicating with the atmosphere, whose length blocks the mouthpiece of the pipe fitting 1b of the air supply line 5. In this way the jet is supplied with air autonomously, and not in series with the other system jets as when for example the pipe fitting 1b has a closed cap 4, which makes it possible to extend the use of the whirlpool with non standard functions. It is common knowledge that the exclusion of the air from the flow supplied from the jet reduces the massaging effect of the jet as a result of a reduction in speed consequent to its decrease in volume with the same outlet cross-section. By programming for example an opening and closing cycle of the pipe 38 by means of an electrovalve fitted on the same, it is possible, thanks to the small quantities of air in question which only slightly reduce the response, to produce an intermitting intensity cycle of the massaging effect of the jet; this feature may be exploited in various ways for therapeutic purposes by varying the connections between the operating cycles and the jets. It follows from the above that the invention satisfactorily meets all the scopes proposed: the same in fact ensures the an hermetic seal of the bathtub when the whirlpool is not operating as well as the complete drainage of the water in the piping of the whirlpool system at the end of the cycle so as to guarantee total hygiene. The invention is also very efficient in terms of operation since the jet it produces can hold, as it penetrates the water mass, all the air mixed in the same until the jet reaches the skin of the user, who will consequently have the best massaging and oxygenating action; in addition non standard functions can be realized for therapeutic purposes and it offers operating stability with no oscillations and vibrations, and finally it has the possibility of adjusting the jet in different directions. The jet is extremely compact, with a consequent reduction in the overall sizes which is extremely important because it increases installation possibilities of the whirlpool system in the case of difficult conditions, as well as ensuring easy assembly and disassembly of the jet as a whole and of its components. The invention in question can be produced with many modifications and in many embodiments, all of which are included in the invention conception: for example the valve 30 can consist of a conical shaped centre projection and the rod 28 can be supported at the axis of the pipe 18 in any way whatsoever, just as the end piece can be realized in any way. In the practical realization of the invention, all the parts can be replaced with other similar technical components; in addition the material used, as well as the shapes and sizes can be modified according to specific requirements. In this prospective and with reference to figure 5, an alternative construction embodiment of the valve (30) is now described. The overall structure of the two opposing hemispherical covers (11 and 12) and that of the piping (18) being unchanged, with respect to valve (30), the valve (30a) illustrated in figure 5 has a number of small differences regarding the shape of its wall and the position of the centering and guide tabs With respect to the piping (18). In particular the valve (30a) is a hollow truncated cone which ends on its wider base with an external thinned lip (301), bent into a "U" shape, which touches the cylindrical surface (33) in the interior of the cover (11). The external surface of the truncated cone is marked in figure 5 with the number (31a). This lip (301) has a thinned profile in order to provide a certain flexibility which allows it, when the water is placed under pressure by the whirlpool system pump, to widen and abut against the cylindrical surface (33), acting like a standard lip seal which holds against the relevant sliding surface. The inside of the valve (30a) has a cylindrical collar (302) whose interior surface (302a) joins with that (32a) of the hole (35a) aligned with the centre space (15) of the cover (11). Inside the collar (302) there are four rigid tabs positioned in the shape of a cross (302b) which fit and slide in a cylindrical collar (15a) inside the centre space (15) of the cover (11). These tabs (302b) act as guiding and centering elements for the valve (30a) during its alternating runs, as it opens and closes, inside the cover (11). In this construction embodiment, the return spring (36a) of the valve (30a) is fitted externally to the above two cylindrical collars (15a) and (302), which are aligned and coaxial. With reference to fig. 5, another construction variation made to cover (12) is underlined, which is simplified thanks to the fact that its appendix does not consist of four sections (21, 22 and 23) with stop teeth (25) for the peripheral projection (24) of the cylindrical element (19). Accidental unscrewing of the piping (18) can in fact be prevented thanks to the friction provided by the gasket (19a), so that the teeth (25) can be eliminated, with a consequent simplification of the profile as well as of the above appendix of the cover (12), which no longer needs to be realized in peripheral sections.

Claims: A whirlpool jet device including: a structure (1) which can be fixed to a wall (2) of a bathtub including a pipe (1a) positioned at the bottom and connected to a water supply line under pressure and a top pipe fitting (1b) selectively communicating with an air supply pipe and directly to the atmosphere; a body (6) including two hollow hemispherical covers (11 and 12) reciprocally connected so as to leave between the same a peripheral space (14) communicating with the water supply pipe; in the first cover (12) turned towards the interior of the bathtub an outlet pipe (18) supplying the jet of air-water and having a rod (28) on its axis, and in the second cover turned (11) to the exterior of the bathtub a centre space (15) communicating with the air supply pipe, said body being housed so that the same may be rotated in a section of space within said structure (1) in order to communicate the peripheral space (14), with the water supply pipe (1a) and the centre space (15) with the air supply pipe (1b); a valve (30) formed with a curved wall such that a concave surface (31) faces the exterior and positioned in the second cover (11) in order to communicate at the concave surface (31) with the water pipe and at the interior convex surface (32) with the air pipe, said curved wall opening at the centre in a hole (35) substantially aligned with the centre space (15) in said second cover (11); a spring (36) between said second cover (11) and the valve (30) in order to push the valve into a normally closed position with the concave external surface (31) in contact with the end of the water flow pipe (18) in the first cover (12) in order to stop the water flow and with the interior surface of the hole (35) in contact with the end (29) of the rod (28) fitted in said outlet pipe, so as to stop the air flow. A whirlpool jet device according to the previous claim, characterized in that the valve (30a) is a hollow truncated cone ending at its widest base with a thinned exterior lip (301) bent into a "U" shape, having at its smaller base an internal cylindrical collar (302), whose internal hole (35a) is aligned with the centre space (15) of the cover (11) where the valve (30a) is positioned; said spring (36a) being fitted between the exterior of the above collar (302) and the collar (15a) on the interior of the space (15), in order to push the valve (30a) into said normally closed position. A whirlpool jet device according to one or more of the previous claims, characterized in that the end (29) of the rod (28) being in contact with the surface of the central hole (35 or 35a) of the valve (30 or 30a) is designed to be elastically pliable. A whirlpool jet device according to one or more of the previous claims, characterized by the presence of a ring nut (3) threaded to the structure (1) of the jet in order to fix the same to the wall (2) of the bathtub, said ring nut (3) having a lid (7) threaded on the same to delimit the section of space for housing, with the interposition of the body gaskets (8 and 9) including the two hemispherical covers (11 and 12), having a threaded screen (10) facing the interior of the bathtub. A whirlpool jet device according to one of more of the previous claims, characterized by a closed cap (4) joined to the top pipe fitting (1b) in the jet structure so as to prevent any direct communication of the same with the atmosphere and communicating with the air supply pipe (5). A whirlpool jet device according to one of more of claims 1-4 characterized by a cap with holes (37) joined to the top pipe fitting (1b) in the jet structure so as to prevent communication with the air supply pipe (5), providing direct communication of the same with the atmosphere. A whirlpool jet device according to one or more of the previous claims, characterized in that the two hemispherical covers (11 and 12) are reciprocally connected by means of clip appendixes (13) derived from one of the covers and which fit and block by elastic deformation in the housings on the other cover, said appendixes having a sufficient length to create between the covers a peripheral space (14) in the required dimensions. A whirlpool jet device according to one or more of the previous claims, characterized in that the valve (30) slides along the periphery against a cylindrical guide surface (33) in the cover (11) facing the exterior of the bathtub, and having radial tabs (34) on the exterior concave surface in the area close to the central hole (35), sliding against the interior surface of the flow pipe (18) of water-air. A whirlpool jet device according to one of more the previous claims characterized in that the valve (30a) by means of its lip (301) slides against the cylindrical surface of a guide (33) in the cover (11) the same being provided with tabs (302b) in the cylindrical collar (302) fitting and sliding within the above cylindrical collar (15a). A whirlpool jet device according to one or more of the previous claims characterized in that the curved wall (31) of the valve (30) on the maximum diameter of the valve (30) has a tangent which is substantially perpendicular to the axis of the water-air flow pipe (18) and substantially parallel to said axis on the centre hole (35). A whirlpool jet device according to one or more of the previous claims characterized in that the water-air flow pipe (18) has the end facing the interior of the cover (12) shaped according to a surface (19b) which determines with the valve (30 or 30a) open, a pipe for the water flow, having a progressively decreasing cross-section, at least at the front section. A whirlpool jet device according to one or more of the previous claims characterized in that the water-air flow pipe (18) has a cylindrical element (19) threaded (20) to an appendix facing the interior of the cover (12) turned to the interior of the bathtub and realized in sections (21, 22 and 23) in order to provide an elastic deformation to block this cylindrical element (19) by a peripheral projection (24) of the same striking against teeth (25) derived from said sectors, at the exterior end of said cylindrical element having a ring nut (26) blocked by elastic deformation. A whirlpool jet device according to one or more of the previous claims characterized in that the rod (28) on the water-air flow pipe axis, has a mushroom shaped elongated end (29) made of rubber which is elastically pliable, terminating with tabs (27) for connection to the end ring nut (26) of said pipe.

Inventors: FILIPPONI ALBERTO, FILIPPONI, ALBERTO
Applicants: FILIPPONI A & C SEA SNC, SEA DI FILIPPONI A. & C. - S.N.C.
Application year: 1992
Main classification: A61H33
IPC codes: A61H33