FR3019048A1 - DEVICE FOR DIFFUSION OF AROMATIC SUBSTANCES. - Google Patents

Abstract

The invention relates to a diffuser of liquid volatile substances, comprising: - an installation comprising two ducts and in which flows in a closed circuit, a liquid perfuming and / or sanitizing composition, - a double plug (3) consisting of two endpieces (3a , 3b) connected head to tail, each of said end pieces (3a, 3b) comprising a connection end (4a, 4b) for connecting said end piece (3a, 3b) to one of the conduits so that the liquid composition (2) is flows through said double plug (3), characterized in that: - the double plug (3) is made in a wooden part adapted to impregnate the liquid composition during the flow of the latter to inside said double plug (3), which liquid composition evaporates in the form of volatile substances in contact with the ambient air, - the double plug (3) integrates a conduit (6) through which flows the liquid composition, which conduit (6) comprises: central channel (60) having two ends (6a, 6b); • conical cavities (60a, 60b) arranged in each of the end pieces (3a, 3b), each conical cavity (60a, 60b) having its top adjacent to one of the ends of the channel (60) and its base which is adjacent to the connection end (4a, 4b) associated with the end piece (3a, 3b) in which said cavity (60a, 60b) is arranged, a seal (15a, 15b) placed in each of the connection ends (4a, 4b) so as to provide a seal between the double plug (3) and the containers (1a, 1b).

Description

- 1 - DEVICE FOR DIFFUSION OF AROMATIC SUBSTANCES Description Technical field of the invention.

The subject of the invention is a diffuser of liquid volatile substances for perfuming and / or purifying the ambient air. It concerns the technical field of controlled and controlled diffusion devices for liquid volatile actives, particularly for eco-responsible products. State of the art

Many devices for evaporating a perfume in an enclosed space are known from the state of the art. They have been created in order to overcome certain disadvantages such as too rapid diffusion of scented substances, continual evaporation and difficult to dose. Among these devices, there are for example pump mechanical sprays, systems consisting of a wick bathed in a reservoir containing a liquid, or porous media scented paper. However, all these devices have many disadvantages: either it is difficult to abruptly interrupt the diffusion of the perfume, or they are inefficient, or they are expensive to package.

To avoid some of these disadvantages, patent WO 2011128604 (DIPTYQUE) proposes a fragrance diffuser composed of two bottles connected by a diffusion system. The diffusion system comprises two pourer-mounted pouring caps between which is a plate of porous material and an outer ring provided with an orifice. This complex system requires the presence of holes and flow tubes in each stopper to allow the liquid to flow from one vial to another and does not control the return of air. The system described in this patent requires the manufacture of special caps. In addition, the complexity of the assembly makes the system difficult to waterproof during its use. This risk of uncontrolled leaks is found in all wick diffusers. In addition to the drawbacks mentioned above, the vast majority of the proposed devices uses perfumes that do not meet the strict standards of body perfumery. They generally use the violent scents of the usual formulations of cleaning products. Few known products are respectful of the environment and are mainly made of natural or renewable products.

The invention aims to remedy this state of affairs. In particular, an object of the invention is to provide a simplified diffuser for the end user compared to that proposed in patent WO 2011128604 (DIPTYQUE). Another object of the invention is to provide a diffuser for a great regularity of operation. Yet another object of the invention is to provide a diffuser that can be activated on demand at the desired time.

A further object of the invention is to provide a diffuser whose production is environmentally friendly and ecological, to achieve an eco-responsible and renewable product composed of bio-sourced ingredients.

Disclosure of the invention. The solution proposed by the invention is a diffuser of liquid volatile substances, comprising: - an installation comprising two ducts and in which circulates in a closed circuit, a liquid perfuming and / or sanitizing composition, - a double cap consisting of two connected ends head-to-tail, each of said tips comprising a connecting end for connecting said tip to one of the conduits so that the liquid composition flows through said double plug. This diffuser is remarkable in that: the double cap is made in a wooden part adapted to impregnate the liquid composition during the flow of the latter inside said double cap, which liquid composition evaporated in the form of volatile substances in contact with the ambient air, the double plug incorporates a conduit through which the liquid composition flows, which conduit comprises: a central channel provided with two ends, conical cavities arranged in each of the tips, each conical cavity having its apex which is adjacent to one of the ends of the channel and its base which is adjacent to the connecting end associated with the tip in which said cavity is arranged, - 4 - - a seal placed in each of the connection ends so as to ensure a seal between the double cap and the containers.

The Applicant has noticed that the use of such a diffuser allowed the liquid composition to diffuse through the wood and to impregnate and then evaporate in the ambient air, while being much easier to use and considerably less expensive than those previously described in the state of the art. In addition, this diffuser is particularly effective because it allows to evaporate in measured quantities, and regularly over time, the liquid composition, which is highly appreciable for the satisfaction of the user. Other advantageous features of the invention are listed below. Each of these features may be considered alone or in combination with the outstanding characteristics defined above, which outstanding features are not indispensable as such for the resolution of technical problems that the following features propose to solve: - according to a preferred embodiment of the invention: - the installation consists of a first container and a second container adapted to contain the liquid perfuming and / or sanitizing composition, each of said containers having a mouth connected to one of the ends connecting the double plug, the double plug ensures fluid communication between the two containers so that the liquid composition passes from one container to another by turning the diffuser; - Another version of the diffuser may have an installation which comprises: - at least one container adapted to contain the perfuming and / or sanitizing liquid composition, - a means for circulating the liquid composition from the container to the double cap; the double plug may consist of longitudinal fibers oriented in the direction of flow of the liquid composition; the double plug can have a wall of constant thickness; the end pieces may include abutments at the base of the conical cavities, the flexible and tight joints being placed on said abutments, which joints are pierced with holes of diameter equal to the diameter of the base of the conical cavities; - the joints can be made of cork; the double plug may comprise sculptures or diffusion fins making it possible to increase the contact between said double plug and the ambient air; the containers may be glass bottles or made of a transparent plastic material; - The ducts and connection ends of the double-cap can be connected by screwing or snapping; the liquid composition may comprise a mixture of essential oils, vegetable alcohol and adjuvants of vegetable origin; the liquid composition may comprise a purifying agent consisting of a mixture of essential oils selected for their naturally bactericidal effects; the double cap can be associated with a bracket or a cradle designed to activate the reversal of said diffuser, which reversal is done in the manner of an hourglass; the double plug can be integral with an operating rod; the double plug may be equipped with a clamp mounted in a hollow orifice, which orifice is made in said double plug, said clamp consisting of a ball joint removably mounted in said cavity and three fins, one of which is opposite to the two others.

Another aspect of the invention relates to a method for perfuming and / or purifying the ambient air comprising the following successive steps: a. flipping the diffuser according to one of the preferred embodiments of the invention, b. flow of the liquid composition until saturation of the double cap, c. evaporation of the volatile liquid composition until the double plug is dry, d. repetition of steps a) to c) until the liquid composition is exhausted. Description of the figures.

Other advantages and characteristics of the invention will appear better on reading the description of a preferred embodiment which follows, with reference to the accompanying drawings, made by way of indicative and non-limiting examples and in which: Figure 1 is a schematic view of an embodiment of the diffuser according to the invention; - Figure 2 is a longitudinal sectional view of the diffuser of Figure 1; FIG. 3 is an enlarged view of FIG. 2 showing in detail the design of the double plug; - Figures 4 and 5 illustrate two other embodiments of the diffuser object of the invention; FIG. 6 illustrates various possible forms of the double plug; - Figure 7a is a perspective view of a ball-and-socket pliers. FIG. 7b shows schematically the mounting of the ball joint according to FIG. 7a on a double plug; - 8 - - Figure 8 is a schematic view of another embodiment of the diffuser according to the invention.

Preferred embodiments of the invention The diffuser (1) object of the invention is used for the purification, perfuming and / or cleaning of the air of various enclosed spaces such as a room or the interior of a car. It is intended to diffuse, for a prolonged period, a volatile liquid composition (2), such as most essential oils. Having for primary objective to facilitate the use by the consumer, the diffuser (1) object of the invention is also manufactured so as to be respectful of health and the environment by advantageously integrating an original complex formulation.

The diffuser (1) operates in a closed circuit. The liquid composition (2) circulates between two ducts connected to a double plug (3), which double plug (3) makes it possible to diffuse said liquid composition (2) into the ambient air.

Figures 1 and 2 show a first embodiment of the diffuser (1). It consists of two containers (I a, I b) connected by a double cap (3). The containers (la, 1b) may be bottles, flasks or any other type known to those skilled in the art. They are made of a hermetic and preferably transparent or translucent material, and may be made of glass, plastic or any other rigid material with recognized properties of transparency and resistance to corrosive agents, such as polypropylene, PET or certain acrylic materials. They are preferably chosen from known and easily obtained containers, this feature making it easier to manufacture and therefore to limit the cost price. In addition, eco-responsible and renewable materials such as glass, which is infinitely recyclable, will be chosen. As shown in Figure 2, each container (1a, 1b) comprises a body (11a, 11b) having for example a capacity ranging from 5 mL to 50 mL, and can adopt various shapes such as a bottle cylindrical, round, flat, a bulb, or any other existing geometric form. One end of the body (11a, 11b) is extended by a neck (13a, 13b) connecting said body (11a, 11b) to its mouth (12a, 12b). The necks (13a, 13b) and / or the mouths (12a, 12b) constitute conduits within the meaning of the invention. The other end of the body (11a, 11b) is closed by a bottom (14a, 14b) forming a support on which rests, in one of the preferred embodiments of the invention, the diffuser (1). Each mouth (12a, 12b) has a closure means for receiving the double cap (3). Thus, each container (1a, 1b) is mounted fixedly or removably in one or the other end of the double plug (3). The advantage of having a removable assembly lies in the fact that one of the two containers (1a, 1b) can be offered separately or purchased as a refill having a scent chosen by the consumer. This refill can be offered to the consumer with a simplified and economical closure system, such as a screw cap, a capsule or a tongue. The double plug (3) can be used with a quantity of liquid composition (2) greater than the capacity of the containers (1a, 1b), an eco-responsible management thereof may, for example, consist in offering the consumer, the possibility of buying a refill. This refill is in the form of a container containing a liquid composition supplement (2). In order to be as eco-friendly as possible, the packaging of the refill is preferably minimalist and made of a single sheet of assembled cardboard without gluing. These characteristics are particularly described in the patent FR 2.944.778 (JEAN) to which the skilled person can refer. The closure means for fixing the mouthpiece (12a, 12b) on the double plug (3) can be of different shape, such as for example: - a standard ring screw thread, on which is screwed a thread of same nature carried out inside one or the other of the connection ends (4a, 4b) of the double plug (3). This closure means allows the use of a large number of containers (1a, 1b) with interchangeable shapes and capacities; - A deformable sleeve, for example rubber, adopted to be inserted forcefully in the double-cap (3); a latching system, for example with an O-ring, similar to the quick couplings. This system known to those skilled in the art can be made of steel or plastic. It has the advantage of being easy to use and adapt to different containers of different materials, shapes and capacities.

The two containers (1a, 1b) are therefore connected to each other by means of a double plug (3) which is installed on the mouths (12a, 12b) of each said container (1a, 1b). In Figures 2 and 3, the double plug (3) consists of two ends (3a, 3b) connected head to tail and made in a wooden piece.

This wooden piece is preferentially unique. The end pieces (3a, 3b) are in the form of plugs fixed on the ends (12a, 12b) of the containers (1a, 1b). They are shaped so as to be symmetrical with respect to an axis (100), which axis is perpendicular to the direction of flow of the liquid composition (2) in the double plug (3).

The double plug (3) is advantageously made from a single piece of turned wood, which is a natural evaporator, more effective than plastics. The wood species preferentially used is beech which can be turned easily. It offers a very regular absorption-diffusion capacity, including for highly volatile natural essential oils, and withstands all kinds of active ingredients and alcohols without damage. In addition, its appearance and the contrast of the veins of the wood are improved by their impregnation. However, we can consider using another natural or synthetic absorbent material such as terracotta, corn cob or some polymeric materials, or other wood species such as cork, reed, exotic woods, oak or ash. This configuration allows a simplified use of the diffuser (1) by the consumer. The applicant has noticed that, surprisingly, the use of the double plug (3) was optimal when the thickness of the wood remained constant throughout its length, in all its parts including the threads, this thickness being able to vary by 2 mm. at 2 cm. In FIGS. 2 and 3, the double plug (3) has two connecting ends (4a, 4b) associated with the mouths (12a, 12b) of the containers (1a, 1b) and a conduit (6) forming a passage through which flows the liquid composition (2) during the reversal of the diffuser (1). When using the diffuser (1), the liquid composition (2) flows through the central channel (60) while diffusing into the wood fibers constituting the double plug (3). It passes from the upper container, for example the container (1a), to the lower container, for example the container (1b). During this step, the double plug (3) is impregnated with a liquid composition (2) which then evaporates as volatile substances in the ambient air. This evaporation takes place until the double cap (3) no longer contains a liquid composition (2) and becomes dry again to the touch. The diffuser (1) can then be turned over so that the remaining liquid composition (2) passes from the container (1b) to the container (1a). These successive steps are repeated until exhaustion of the liquid composition (2). This mode of diffusion has the advantage of not diffusing permanently and in pure loss, but to propose a regulated evaporation. Thus, after one or more turns and when the double cap (3) is sufficiently impregnated, it will diffuse long and effectively until it is dry to the touch. This technique avoids unnecessary consumption by providing an activation at a time decided by the user. The broadcaster (1) can be reactivated at the right time and at the sole will of the user.

The nature of the two connection ends (4a, 4b) for fixing the two receptacles (1a, 1b) will depend on the aforementioned closure means. They have a diameter equivalent to that of the mouths (12b, 12a) and can vary from 0.5 cm to 5 cm. The shape of the connection ends (4a, 4b) is adapted to that of the mouths (12a, 12b) to obtain a tight assembly.

As clearly shown in Figure 3, the duct (6) is divided into three parts, namely a central channel (60) and two conical cavities (60a, 60b) arranged in each of the end pieces (3a, 3b).

The central channel (60) is parallel to an axis (200) corresponding to the flow direction of the liquid composition (2). It has a diameter that can vary from 1 mm to 15 mm. For example, for a double plug (3) having a diameter of about 20 mm, the central channel (60) has a diameter of about 4 mm. The length of the channel (60) depends on the size of the double plug (3) as well as the quality of the liquid composition (2), and can vary from 5 mm to 20 cm. The variation of the diameter of the central channel (60) makes it possible to vary the flow velocity of the liquid composition (2) and therefore the time required to pass the entire liquid composition (2) of a container (1a, 1b ) to the other. In general, this time is between 30 minutes and 3 hours.

The conical cavities (60a, 60b) each have an apex (61a, 61b) adjacent the ends (6a, 6b) of the central channel (60) and a base (62a, 62b) adjacent to the mouths (12a, 12b) of each container (1a, 1b). These conical cavities (60a, 60b) make it possible to increase the contact area between the liquid composition (2) and the wood constituting the double plug (3). Surprisingly, this configuration allows a better flow of the liquid composition (2) through the central channel (60) while promoting a return of air from the lower container (1b) to the upper container (1a). when using the diffuser (1). There is also an increase in the diffusion of the liquid composition (2) which corresponds to a natural porosity through the wood fibers constituting the double plug (3). These fibers are preferably longitudinal, parallel to the direction of flow of the liquid and the central channel (60). This orientation of the fibers allows a flow of the liquid composition (2) quite slow and regular. Thus, after passing through the conduit (6), the liquid composition (2) forms drops (G) of regular size and flow and / or flows along the walls of the body (11a, 11b) of the container (1a, 1 b). The liquid composition (2) in contact with the inner wall of the double plug (3) will impregnate it. This liquid composition (2) will migrate throughout the wooden part, radially towards the outer wall of the double plug (3) at which it will evaporate. The presence of longitudinal fibers and the natural porosity of the selected wood facilitates this impregnation and promotes the evaporation of the liquid composition (2) in the ambient air in the form of volatile substances, thus generating its perfuming action and / or sanitation. In FIG. 3, the two connecting ends (4a, 4b) of the double plug (3) are equipped with a stop (7a, 7b) for receiving the mouth (12a, 12b) of the container (1a, 1 b). This stop (7a, 7b) is located at the base of the conical cavity (62a, 62b) and therefore adjacent to the mouths (12a, 12b). The stop (7a, 7b) can have a length ranging from 0.1 mm to 10 mm. These abutments (7a, 7b) allow to receive a seal (15a, 15b) for sealing between the container (1a, 1b) and the end piece (3a, 3b). This seal (15a, 15b), with a thickness of between 1 mm and 5 mm, is flexible and perfectly sealed. It can be made of silicone, polyethylene, plastic or any other material allowing to isolate effectively. It can also be made of a natural material such as cork, a foam derived from polylactic acid or any other material compatible with essential oils. For an embodiment of the double-cap (3) 100% vegetable, we will preferentially choose a seal (15a, 15b) cut in a sheet of agglomerated cork fine particles. The seals (15a, 15b) have a diameter allowing them to fit into the connection ends (4a, 4b) of the double plug (3). They are pierced with a hole having a diameter corresponding to that of the base of the conical cavity (62a, 62b) thus allowing to pass the liquid composition (2) without obstacle. The diffusion of the liquid composition (2) through the double plug (3) can be increased to improve its efficiency. Figure 6 shows sculptures or diffusion vanes (5) carved outside the double cap (3), to increase its contact surface with the ambient air. These fins or sculptures (5) can have any shape known to those skilled in the art. The double cap (3) can be in the form of a barrel (A), an hourglass (B) or have a central fin located at the channel (6) and blisters at its ends (C). ). The double cap can still have two blisters (D) or 3 fins (E) at its ends (4a, 4b). These geometric shapes, in addition to improving the diffusion, make it possible to manufacture a diffuser (1) more aesthetic and therefore more attractive for the end user. In addition, the fact of making this plug-double (3) turning allows easy manufacturing and cost-effective from an economic point of view.

The liquid composition (2) used in the diffuser (1) can be of any kind. It contains at least one perfume base which can be diffused into the ambient air and constituting between 3% and 80% by volume of the liquid composition (2). It is preferentially in the form of a liquid active composition based on essential oils of natural origin. All the components forming part of this liquid composition (2) are preferably chosen from renewable products and of plant origin from to produce an environmentally friendly product.

The liquid composition (2) may also contain adjuvants which make it possible to optimize its formulation so as to adjust the fluidity and obtain an optimum density of between 0.9 and 1. These adjuvants constitute between 3% and 80% by weight. volume of the liquid composition (2) as indicated in the formulation example given below.

An example of formulation of the liquid composition (2) for use in the diffuser (1) comprises: from 3% to 80% by volume of a perfume base complex and volatile according to the standards of perfumery, enriched with oils essential or composed mainly of 100% natural, vegetable and renewable essential oils, - from 3% to 80% by volume of ethyl alcohol of agricultural origin, neutral or denatured and comprising 3% of essential oil, preferably an oil lavandin essential of biological origin, - from 3% to 80% by volume of adjuvants for regulating the evaporation, the density or the flammability of the diffuser (1). These adjuvants are used alone or in admixture and are chosen from vegetable triethyl citrate, biosourced monopropylene glycol (MPG) and biosourced dipropylene glycol monoethyl ether (DPM), - from 1% to 20% by volume of dendecylenate. ethyl (C11), from 1% to 30% by volume of a composition of 100% natural essential oils selected for their naturally bactericidal effects. Adjuvants may be used alone or in combination with vegetable alcohol. These adjuvants are preferably all environmentally friendly with flash points of about 150 ° C, thus controlling the flammability and thus improve the safety of the end user. For ease of use, and as shown in Figure 4, the double cap (3) can be associated with a cradle (9) facilitating the reversal of the diffuser (1). More particularly, the cradle (9) has at least one horizontal axis of rotation (100), perpendicular to the axis (200), and around which the diffuser (1) pivots. This cradle (9) can be mounted on a tripod-type support (90) for placing the diffuser (1) on a table or a shelf. It can also be attached to a loop to suspend it to a particular fastener. The cradle (9) can also be in the form of a stem (Figure 5) ending in a ball forming a ball being housed in a specially sculpted cavity in the double cap (3). As shown in FIGS. 7a and 7b, the double plug (3) can also be associated with a mounting clamp (80) mounted on a ball joint (81). This clamp (80) is formed of three fins (82, 83, 84), one of which is opposite to the other two as described in the patent FR 2.944.778 (JEAN) with reference to FIG. profession may refer. This clamp (80) is particularly suitable for fixing the diffuser (1) on a ventilation grille. The ball (81) is embedded, removably, in a corresponding diameter hole created in the double cap (3).

In an alternative embodiment, the clamp (80) can be replaced by an operating rod nested in the hole created in the double plug (3) in the same way as the ball (81). This embodiment allows, for example, to hold the rod between two fingers and perform a manual reversal of the diffuser (1). So that the stem does not impregnate perfume, it is preferably carried out in a wood having a low porosity, such as boxwood. In the variant embodiment illustrated in FIG. 8, the ends (4a, 4b) of the double plug (3) are connected to conduits (70a, 70b) which are themselves attached to at least one container (1a) remote from said double cap (3). This container (1a) can be in the form of a reservoir. This embodiment allows, in the same manner as that described above, the flow of the liquid composition (2) through a sealed closed circuit and without return air. However, no flipping is necessary to activate the broadcaster (1). This activation is done through a means (71) for moving the liquid, for example a pump which can be chosen so as to be able to program in time the passage of the liquid composition (2) inside. double plug (3).

The displacement means (71) can be in the form of: - an Archimedes screw activated by a power source and can be equipped with a non-return valve to stop it once the entire liquid composition (2) contained in the tank (1a) is passed inside the double plug (3), - a pump activated by a power source, - a double tilting tank, at the way of a Japanese bamboo fountain, - a tank used in the manner of a Florentin vase to circulate the liquid composition (2) volatile closed circuit.

The energy sources used can be of multiple forms. Preferably, the energy source is already existing, such as that created by the circulation of air, the circulation of water, the circulation of the outside wind or ventilation.

The arrangement of the various elements and / or means and / or steps of the invention, in the embodiments described above, should not be understood as requiring such an arrangement in all implementations. In any case, it will be understood that various modifications may be made to these elements and / or means and / or steps, without departing from the spirit and scope of the invention. In particular: - the number of turns of the diffuser (1), - the components of the liquid composition (2), - the sizes of the containers (1a, 1b) and the double plug (3), - the type of means of closure between the containers (1a, 1b) and the double cap (3), the type and nature of the containers (1a, 1b) used, the number of adjuvants making up the liquid composition (2) ), - the shape of the sculptures or diffusion vanes (5), - the materials in which the seals (15a, 15b) are formed, - the shape of the double plug (3), - the screwing mode or latching, - the shape and capacity of the containers (1a, 1b), - the liquid displacement means (71) used, - the energy source used.

Claims (16)

REVENDICATIONS1. Diffuser of liquid volatile substances, comprising: - an installation comprising two conduits (70a, 70b) and in which circulates in a closed circuit, a liquid composition (2) perfuming and / or sanitizing, - a double plug (3) consisting of two ends (3a, 3b) connected head to tail, each of said end pieces (3a, 3b) comprising a connection end (4a, 4b) for connecting said end piece (3a, 3b) to one of the ducts (70a, 70b) so that the liquid composition (2) flows through said double plug (3), characterized in that: - the double plug (3) is made in a wooden part adapted to impregnate the liquid composition ( 2) during the flow of the latter inside said double plug (3), which liquid composition (2) evaporates in the form of volatile substances in contact with the ambient air, - the double plug ( 3) integrates a conduit (6) through which the liquid composition (2) flows, which conduit (6) comprises te: - a central channel (60) provided with two ends (6a, 6b), - conical cavities (60a, 60b) arranged in each of the end pieces (3a, 3b), each conical cavity (60a, 60b) having its top which is adjacent to one end of the channel (60) and its base which is adjacent to the connecting end (4a, 4b) associated with the mouthpiece (3a, 3b) in which said cavity (60a, 60b) is arranged, - a seal (15a, 15b) placed in each of the connecting ends (4a, 4b) so as to ensure a seal between the double plug (3) and the containers (1a, 1b). 2. Diffuser according to claim 1, characterized in that the installation consists of a first container (1a) and a second container (1b) adapted to contain the liquid composition (2) perfuming and / or sanitizing, each of said containers (1a, 1b) having a mouth (12a, 12b) connected to one of the connection ends (4a, 4b) of the double cap (3), - the double-cap ( 3) is adapted to ensure fluid communication between the two containers (1a, 1b) so that the liquid composition (2) passes from one container to another by turning the diffuser (1). 3. Diffuser according to claim 1, characterized in that the installation comprises: - at least one container (1a) adapted to contain the liquid composition (2) perfuming and / or sanitizing, - means (71) for circulating the liquid composition (2) from the container (1a) to the double cap (3). 4. Diffuser according to one of claims 1 to 3, characterized in that the double plug (3) consists of longitudinal fibers oriented in the direction of flow of the liquid composition (2). 5. Diffuser according to one of claims 1 to 4, characterized in that the double plug (3) has a wall of constant thickness. 6. Diffuser according to one of claims 1 to 5, characterized in that the ends (3a, 3b) comprise stops (7a, 7b) at the base of the conical cavities (60a, 60b), the seals (15a , 15b) flexible and sealed being placed on said abutments (7a, 7b), which joints (15a, 15b) are drilled with holes of diameter equal to the diameter of the base of the conical cavities (60a, 60b). 7. Diffuser according to one of claims 1 to 6, characterized in that the joints (15a, 15b) are cork.-20- 8. Diffuser according to one of claims 1 to 7, characterized in that the double plug (3) comprises sculptures or diffusion vanes (5) for increasing the contact between said plug-double (3) and the 'ambiant air. 9. Diffuser according to claim 2, characterized in that the containers (1a, 1b) are glass bottles or made of a transparent plastic material. 10. Diffuser according to one of claims 1 to 9, characterized in that the ducts (70a, 70b) and the connection ends (4a, 4b) of the double plug (3) are connected by screwing or latching. 11. Diffuser according to one of claims 1 to 10, characterized in that the liquid composition (2) comprises a mixture of essential oils, vegetable alcohol and adjuvants of plant origin. 12. Diffuser according to one of claims 1 to 11, characterized in that the liquid composition (2) comprises a cleaning agent consisting of a mixture of essential oils selected for their naturally bactericidal effects. 13. Diffuser according to claim 2, characterized in that the double plug (3) is associated with a bracket or a cradle (9) designed to activate the reversal of said diffuser (1), which reversal is carried out in the manner of an hourglass. 14. Diffuser according to claim 2, characterized in that the double plug (3) is integral with an operating rod. 15. Diffuser according to claim 2, characterized in that the double plug (3) is equipped with a clamp mounted in a hollow orifice, which orifice is formed in said double plug (3), said clamp consisting of a ball-mount removably in said cavity and three fins (82, 83, 84), one of which is opposite to the other two. 16. A method for perfuming and / or purifying the ambient air comprising the following successive steps: a. reversal of the diffuser (1) according to claim 2, b. flow of the liquid composition (2) until saturation of the double cap (3), c. evaporation of the volatile liquid composition (2) until the double cap (3) is dry, d. repetition of steps a) to c) until the liquid composition is exhausted (2).