System for spraying cleaning fluid with two nozzles and directional valve

Abstract

The invention relates to a system (100) for spraying a cleaning fluid, the system comprising a first nozzle (140.1) and a second nozzle (140.2), each nozzle being capable of receiving and spraying a cleaning fluid. The system further includes a directional valve (130) including an inlet, a first outlet, and a second outlet, the directional valve being capable of delivering the cleaning fluid from the inlet to the first outlet when the pressure of the cleaning fluid received at the inlet is below a given threshold, and the directional valve being capable of delivering the cleaning fluid from the inlet to the second outlet when the pressure of the cleaning fluid received at the inlet is above a given threshold. The directional valve is configured to deliver cleaning fluid from the inlet to the second outlet. The system includes a pump (120) capable of injecting fluid into the directional valve and capable of varying the pressure of the fluid.

Description

[0001] The invention relates to a cleaning fluid spraying system, in particular for a motor vehicle wiping system, and in particular to a spraying system comprising at least two different nozzles.

[0002] Equipment such as motor vehicles often have a cleaning fluid spray system with several nozzles (sometimes even different types of nozzles) to perform various functions, in particular for cleaning sensor surfaces or windows. Such multi-nozzle spray systems are not specific to motor vehicles and can be used in other equipment including several surfaces to be cleaned.

[0003] It is conceivable to share a pump for feeding the cleaning fluid to the nozzles of the spraying system. In order to selectively feed the two nozzles, in particular to feed one nozzle and then the other nozzle, it is known to use a solenoid valve between each nozzle and the pump. The solenoid valve can be controlled by an electrical signal to distribute or not distribute the cleaning fluid to the nozzle.

[0004] However, control by electrical signals is not very robust, especially in the event of electrical faults or mechanical shocks, involves the use of space-intensive wires, and is expensive.

[0005] Therefore, there is a need for a cleaning fluid spraying system having at least two nozzles and a single pump that is robust, space-saving, lightweight, and inexpensive.

[0006] The present invention improves this situation.

[0007] A first aspect of the present invention relates to a system for spraying a cleaning fluid, the system comprising:

[0008] a first nozzle and a second nozzle, each nozzle being capable of receiving a cleaning fluid and spraying said cleaning fluid from a spraying system, for example onto a protective surface of the sensor;

[0009] - A directional valve comprising an inlet, a first outlet and a second outlet, the directional valve being capable of directing the cleaning fluid from the inlet to the first outlet when the pressure of the cleaning fluid received at the inlet is below a given threshold, and being capable of directing the cleaning fluid from the inlet to the second outlet when the pressure of the cleaning fluid received at the inlet is above the given threshold.

[0010] This makes it possible to selectively inject cleaning fluid into two nozzles using a single pump without the need for a solenoid valve controlled by wires. Specifically, the directional valve can be passively controlled by changing the pressure of the cleaning fluid (above a given threshold or below a given threshold). The given threshold can be achieved by a simple mechanical system. Such a mechanical system is more robust, less space-intensive, less expensive, and lighter than wire control.

[0011] The protective surface of the sensor is the optical surface of the sensor, i.e. the surface that transmits and / or receives the sensor signal. Thus, the protective surface of the sensor may be the sensor lens, the surface of the housing in which the sensor is located, or any other surface that protects the sensor. The protective surface of the sensor is transparent for the signals intended to be transmitted and / or received by the sensor.

[0012] For example, the spray system includes a pump capable of injecting a cleaning fluid into a directional valve and capable of varying the pressure of the injected cleaning fluid so that the valve distributes the cleaning fluid into the first nozzle or the second nozzle.

[0013] According to certain embodiments, the first nozzle and the second nozzle are configured to spray a cleaning fluid onto an optical surface of a motor vehicle sensor.

[0014] According to certain embodiments, the first nozzle may have at least a first optimal operating value, and the second nozzle may have at least a second optimal operating value different from the first optimal operating value; the first optimal operating value of the first nozzle may be associated with a first cleaning fluid inlet pressure below a given threshold, and the second optimal operating value of the second nozzle may be associated with a second cleaning fluid inlet pressure above a given threshold.

[0015] Thus, the above advantages can be achieved while optimally feeding the nozzles. Thus, the operation of the cleaning fluid spraying system is optimized.

[0016] In addition, the at least one first optimal operating value may be a flow value of the first nozzle and / or an inlet pressure value of the first nozzle, and the at least one second optimal operating value may be a flow value of the second nozzle and / or a pressure value of the second nozzle.

[0017] Therefore, the spraying of the cleaning fluid by each nozzle is performed optimally.

[0018] According to some embodiments, the first nozzle may be of a first type defining a first relationship between nozzle flow rate values ​​and nozzle inlet pressure values, and the second nozzle may be of a second type defining a second relationship between nozzle flow rate values ​​and nozzle inlet pressure values.

[0019] Thus, the same pump can be shared between several types of nozzles, which may perform different spraying functions or be responsible for cleaning different glazing surfaces.

[0020] According to some embodiments, the first nozzle may be of a first type and the second nozzle may be of a second type.

[0021] For example, the first type and the second type may be selected from the following:

[0022] - Fixed single nozzle;

[0023] -Fixed double nozzle;

[0024] -Retractable single nozzle;

[0025] - a telescopic spray boom having several nozzles; and

[0026] - A fixed spray bar in the form of an arc, for example a circle or a semicircle, comprising several nozzles.

[0027] This enables the directional valve to be used in a variety of spray systems to perform different cleaning fluid spray functions.

[0028] In the first embodiment, the first nozzle may be a telescopic single nozzle, and the second nozzle may be a fixed spray bar in the form of an arc, such as a circular or semicircular form, comprising several nozzles.

[0029] Thus, a single pump can be used to perform two different spraying functions in a robust, lightweight, inexpensive and space-saving manner.

[0030] In a second embodiment, the first nozzle may be a telescopic single nozzle and the second nozzle may be a telescopic wand with several nozzles.

[0031] Such a spraying system is particularly advantageous in motor vehicles having several different sensors to be cleaned. For example, in an advantageous manner, a telescopic single nozzle can be dedicated to cleaning a vehicle camera, while a telescopic rod can be dedicated to cleaning a vehicle lidar.

[0032] According to certain embodiments, the directional valve may include a piston in contact with a spring, the piston being able to slide in the directional valve to adopt an equilibrium position depending on the position of the spring and the pressure of the cleaning fluid at the inlet of the directional valve, and the position of the spring being adjustable by means of an adjusting element to modify a given threshold.

[0033] Thus, a given threshold value can be modified, in particular when one of the nozzles is replaced by a new one. Furthermore, a standard directional valve suitable for any spraying system according to the invention can be used. Thus, the spraying system is cheaper.

[0034] Furthermore, the adjustment element may be a screw which, when a rotation is applied to the screw, is able to move the position of the spring in order to modify the given threshold value.

[0035] This makes it easy to modify a given threshold.

[0036] According to some embodiments, the directional valve comprises

[0037] a first connecting channel through which a fluid can flow, which first connecting channel is connected to the inlet and the first outlet,

[0038] a first valve head provided with a first loading device, the first valve head being movable within the first connecting channel between an open position when the pressure of the fluid is below a given threshold and a closed position when the pressure of the fluid is above the given threshold,

[0039] a second connecting channel through which a fluid can flow, which second connecting channel is connected to the inlet and the second outlet,

[0040] a second valve head provided with a second loading device, the second valve head being movable in the second connecting channel between an open position when the pressure of the fluid is above a given threshold and a closed position when the pressure of the fluid is below the given threshold,

[0041] The first connecting passage is configured to be closed when the first valve head moves from its open position to its closed position, and the second connecting passage is configured to be closed when the second valve head moves from its open position to its closed position.

[0042] For example, the first valve head and the second valve head are spheres.

[0043] For example, the first loading element and the second loading element are return elements, such as springs.

[0044] For example, the first connecting channel comprises a constriction located downstream of the first valve head.

[0045] For example, the second connecting channel comprises a constriction upstream of the second valve head.

[0046] The present disclosure also relates to a component comprising a spraying system according to one of the above-mentioned features, and at least a first sensor protection surface and a second sensor protection surface, the first nozzle being configured to spray a fluid onto the first protection surface, and the second nozzle being configured to spray a fluid onto the second protection surface.

[0047] According to some embodiments, the assembly further includes a first sensor configured to transmit and / or receive signals through the first protective surface and a second sensor configured to transmit and / or receive signals through the second protective surface.

[0048] Other characteristics and advantages of the invention will also appear firstly from the following description and secondly from a number of illustrative and non-limiting examples given as guidance with reference to the schematic drawings, in which:

[0049] [ Figure 1 ] Figure 1 A system for spraying a cleaning fluid according to some embodiments of the present invention is presented.

[0050] [ Figure 2 ] Figure 2 The structure of a directional valve according to one embodiment of the present invention is shown.

[0051] [ Figure 3 ] Figure 3 Another embodiment of a directional valve is shown.

[0052] [ Figures 4a to 4d ] Figures 4a to 4d Indicates different types of nozzles.

[0053] First of all, it should be noted that although the drawings provide a detailed description of the invention as implemented, these drawings can of course be used to better define the invention where appropriate. It should also be noted that in all drawings, similar and / or elements that achieve the same function are indicated by the same number.

[0054] Figure 1 A system 100 for spraying a cleaning fluid according to some embodiments of the present invention is shown.

[0055] Such a cleaning fluid spraying system can be installed on a motor vehicle, or any other device or vehicle including a surface to be cleaned (especially a glass surface) that needs to be cleaned regularly or frequently. For example, the surface to be cleaned is the protective surface 180.1, 180.2 of the sensor 170.1, 170.2. In the following, for illustrative purposes, the example of a motor vehicle cleaning fluid spraying system 100 is considered.

[0056] The system 100 includes a cleaning fluid tank 110 storing a cleaning fluid, and a pump 120 is arranged on the cleaning fluid tank, and the pump includes a pump motor ( Figure 1 not shown).

[0057] When the motor of the pump 120 is enabled, the pump can pump the cleaning fluid from the tank 110 to inject the cleaning fluid into the injection channel 150. Thus, the injection channel 150 connects the outlet of the pump 120 to the inlet of the directional valve, by reading Figure 2 The structure of the directional valve will be better understood by the description of the invention. According to the invention, the pump 120 comprises a variable speed motor, the speed being expressed in revolutions per minute, which may have a value of about several thousand revolutions per minute.

[0058] The injection channel is not limited, and can be rigid or flexible, with a length depending on the respective positions of the pump 120, the tank 110 and the directional valve 130. For example, the length of the injection channel can be between 1 meter and 10 meters, for example equal to 5 meters.

[0059] The directional valve 130 includes a first outlet connected to the first nozzle 140.1 via a first distribution channel 160.1 and a second outlet connected to the second nozzle 140.2 via a second distribution channel 160.2. When the cleaning fluid is received at the inlet at a pressure below a given threshold, the directional valve 130 is capable of directing the cleaning fluid from the inlet of the valve 130 to the first outlet. When the cleaning fluid is received at the inlet at a pressure above a given threshold, the directional valve 130 is also capable of directing the cleaning fluid from the inlet of the valve 130 to the second outlet.

[0060] Thus, the directional valve 130 can be passively and mechanically controlled in a manner that selects the outlet to which the cleaning fluid is directed. The use of a directional valve improves the reliability of valve control compared to a dedicated solenoid valve in prior art solutions, because the directional valve is then independent of the external control circuit, thereby avoiding the use of electrical control wires and reducing the size, weight and cost associated with the cleaning fluid spraying system.

[0061] There is no limitation on the given threshold value, which may have a specific value or may be a range of fluid inlet pressure values ​​in the directional valve 130. When a pressure value range including a low value and a high value is used, for an inlet pressure below the low value, the valve may direct the cleaning fluid to the first outlet, and for an inlet pressure above the high value, the valve may direct the cleaning fluid to the second outlet. Therefore, when the inlet pressure of the directional valve 130 is between the low value and the high value, no outlet is selected.

[0062] In the following, for illustrative purposes, a specific threshold value is used. There is no restriction on the threshold value, which in particular may be fixed or mechanically adjustable according to respective optimal operating values ​​of the first nozzle 140.1 and the second nozzle 140.2.

[0063] According to a preferred embodiment, the first nozzle 140.1 has at least a first optimal operating value and the second nozzle 140.2 has at least a second optimal operating value different from the first optimal operating value. The optimal operating value may be a respective flow value of the first nozzle 140.1 and the second nozzle 140.2. Alternatively or additionally, the optimal operating value may be a pressure value at the inlet of the nozzles 140.1 and 140.2. In particular, the optimal nozzle inlet pressure and flow value may vary depending on the respective type of the nozzles 140.1 and 140.2. For example, each type of nozzle may define a relationship between the nozzle flow value and the inlet pressure.

[0064] The first nozzle 140.1 and the second nozzle 104.2 can advantageously be of two different types. Therefore, they necessarily correspond to different optimal operating values, so that the cleaning fluid can be selectively injected into one or the other nozzle by setting a given threshold value to a value between the inlet pressure values ​​of the valve 130 associated with or corresponding to the optimal operating values ​​of the two pumps.

[0065] Specifically, in order to obtain a given flow value of the nozzle at a given inlet pressure of the nozzle, a given pressure value is required at the inlet of the directional valve 130 .

[0066] This given pressure value at the inlet of the directional valve 130 itself corresponds to a given rotational speed of the pump motor 120 .

[0067] Thus, a first optimum valve 130 inlet pressure value may be defined for the first nozzle 140.1 and a second optimum valve 130 inlet pressure value may be defined for the second nozzle 140.2. The threshold value is advantageously between the first optimum value and the second optimum value of the valve 130 inlet pressure.

[0068] There is no restriction on the different nozzle types that the first nozzle 140.1 and the second nozzle 140.2 can have. For example, the following examples are given as illustrations of possibilities:

[0069] - Fixed single nozzle, such as Figure 4a As shown, it sprays cleaning fluid through a single orifice;

[0070] - Fixed dual nozzles, which spray the cleaning fluid through two or more orifices;

[0071] -Retractable single nozzle, such as Figure 4b As shown, it sprays cleaning fluid through a single orifice;

[0072] - Telescopic boom with multiple nozzles, e.g. Figure 4c As shown, each nozzle includes an orifice for spraying a cleaning fluid; and

[0073] - Fixed boom, such as Figure 4d As shown, it is, for example, circular or semicircular, and comprises several nozzles. Such nozzles may be rotatable.

[0074] Such nozzles are well known and will not be described further in this specification.

[0075] According to the first embodiment, the first nozzle 140.1 may be a telescopic single nozzle, and the second nozzle 140.2 may be a circular or semicircular fixed spray bar.

[0076] In this first embodiment, the optimal operating values ​​may correspond to the values ​​listed below given as a guide for a practical nozzle:

[0077] - First nozzle 140.1: optimal flow rate is 10.9 ml / s, optimal nozzle inlet pressure is 2.4 bar. These optimal values ​​correspond to an optimal valve 130 inlet pressure value of 2.7 bar and a pump 120 rotation speed of 2000 rpm;

[0078] - Second nozzle 140.2: Optimal flow rate is 32 ml / s, optimal nozzle inlet pressure is 2.2 bar. These optimal values ​​correspond to an optimal valve 130 inlet pressure value of 3.3 bar and a pump 120 rotation speed of 4000 rpm.

[0079] Thus, by strictly setting the given threshold of the directional valve between 2.7 bar and 3.3 bar, which is the optimal inlet pressure value of the valve 130, one or the other of the nozzles 140.1 and 140.2 can be selected while injecting the cleaning fluid into the nozzles according to their optimal operating values. For example, the given threshold can be set to a value of 3 bar.

[0080] When the directional valve 130 receives the cleaning fluid at a pressure of 2.7 bar, the inlet of the directional valve 130 is connected to the first outlet, the directional valve thus feeds the first nozzle 140.1, which is furthermore under optimum flow and pressure conditions.

[0081] When the directional valve 130 receives the cleaning fluid at a pressure of 3.3 bar, the inlet of the directional valve 130 is connected to the second outlet and the directional valve thus feeds the second nozzle 140.2 which is furthermore under optimum flow and pressure conditions.

[0082] Thus, the pump 120 can selectively inject cleaning fluid into one or the other of the nozzles 140.1 and 140.2 under optimal conditions without actively controlling the directional valve 130, only by adjusting the speed of the pump motor.

[0083] According to the second embodiment, the first nozzle 140.1 may be a telescopic single nozzle, and the second nozzle 140.2 may be a telescopic rod with several semicircular nozzles.

[0084] In this second embodiment, the optimal operating values ​​may correspond to the values ​​listed below given as a guide for a practical nozzle:

[0085] - First nozzle 140.1: As in the first embodiment, the optimal flow rate is 10.9 ml / s and the optimal nozzle inlet pressure is 2.4 bar. These optimal values ​​correspond to an optimal valve 130 inlet pressure value of 2.7 bar and a pump 120 rotation speed of 2000 rpm;

[0086] - Second nozzle 140.2: Optimal flow rate is 37.5 ml / s, optimal nozzle inlet pressure is 2.5 bar. These optimal values ​​correspond to an optimal valve 130 inlet pressure value of 3.9 bar and a pump 120 rotation speed of 5000 rpm.

[0087] Thus, as in the first embodiment, by strictly setting the given threshold of the directional valve between 2.7 bar and 3.9 bar, which is the optimal inlet pressure value of the valve 130, one or the other of the nozzles 140.1 and 140.2 can be selected while injecting the cleaning fluid into the nozzles according to their optimal operating values. For example, the given threshold can be set to a value of 3.3 bar.

[0088] When the directional valve 130 receives the cleaning fluid at a pressure of 2.7 bar, the inlet of the directional valve 130 is connected to the first outlet, the directional valve thus feeds the first nozzle 140.1, which is furthermore under optimum flow and pressure conditions.

[0089] When the directional valve 130 receives the cleaning fluid at a pressure of 3.9 bar, the inlet of the directional valve 130 is connected to the second outlet and the directional valve thus feeds the second nozzle 140.2 which is furthermore under optimum flow and pressure conditions.

[0090] Thus, the pump 120 can selectively inject cleaning fluid into one or the other of the nozzles 140 . 1 and 140 . 2 under optimal conditions without actively controlling the directional valve 130 .

[0091] Figure 2 The structure of a directional valve 130 according to some embodiments of the present invention is shown.

[0092] The directional valve 130 includes an inlet 131, a first outlet 132.1 that may be connected to the previously described first distribution channel 160.1, and a second outlet that may be connected to the previously described second distribution channel 160.2.

[0093] The directional valve 130 is able to connect the inlet to the first outlet 132.1 or the second outlet 132.2, depending on the cleaning fluid pressure in the inlet 131. To this end, the directional valve 130 may include a piston 134 and a spring 135, the cleaning fluid exerting pressure on the piston 134, which is transmitted to the spring 135 and causes the piston 134 to obtain an equilibrium position, which is based on the pressure exerted by the cleaning fluid at the inlet, the constant of the spring 135 and its position.

[0094] The directional valve may comprise a distribution element 133 which moves integrally with the piston and which, depending on the equilibrium position of the piston 134, may be positioned opposite the first interface of the first outlet 132.1 or opposite the second interface of the second outlet 132.2.

[0095] The pressure threshold thus corresponds to the pressure value at which the dispensing element 133 is located between the first and second interfaces. For pressures below a given threshold, the dispensing element thus faces the first interface, whereas for pressures above a given threshold, the dispensing element 133 faces the second interface.

[0096] The directional valve 130 may also include an adjusting element 136 that is capable of changing the position of the spring 135, thereby changing the given threshold of the directional valve. The adjusting element can slide in the same channel as the piston 134, while having a fixed position that cannot be moved by the spring 135. In this way, when the adjusting element 136 moves to the right and thus moves toward the piston 134, the spring 135 is compressed and the given threshold increases. Conversely, when the adjusting element 136 moves to the left and thus moves away from the piston 134, the spring 135 relaxes and the given threshold decreases.

[0097] Adjustment element 136 can be a screw that helps adjust a given threshold. Specifically, the screw head is rotated in one direction or another, causing it to move and cause a change in the pressure threshold.

[0098] Figure 3 1 represents another embodiment of a directional valve. In this embodiment, the directional valve comprises: a first connecting channel 21.1 through which a fluid can flow, the first connecting channel being connected to an inlet 131 and a first outlet 132.1; and a first valve head 23.1 provided with a first loading device 25.1, the first valve head being movable between an open position when the pressure of the fluid is lower than a given threshold and a closed position when the pressure of the fluid is higher than a given threshold in the first connecting channel 21.1. The first connecting channel 21.1 is configured to close when the first valve head 23.1 moves from its open position to its closed position. Here, the first connecting channel 21.1 comprises a first constriction 27.1 located downstream of the first valve head 23.1, the first valve head 23.1 being a sphere having a diameter greater than the maximum dimension of the first constriction 27.1, so that in the closed position, the sphere blocks the first connecting channel 21.1 at the first constriction 27.1.

[0099] In this embodiment, the directional valve further comprises: a second connecting channel 21.2 through which a fluid can flow, the second connecting channel being connected to the inlet 131 and the second outlet 132.2; and a second valve head 23.2 provided with a second loading device 25.2, the second valve head being movable within the second connecting channel 21.2 between an open position when the pressure of the fluid is higher than a given threshold and a closed position when the pressure of the fluid is lower than a given threshold. The second connecting channel 21.2 is configured to close when the second valve head 23.2 moves from its open position to its closed position. Here, the second connecting channel 21.2 comprises a second constriction 27.2 located upstream of the second valve head 23.2, the second valve head 23.2 being a sphere having a diameter greater than the maximum dimension of the second constriction 27.2, so that in the closed position, the sphere blocks the second connecting channel 21.2 at the second constriction 27.2.

[0100] In this case, the first acting element and the second acting element are restoring elements, for example springs.

[0101] exist Figure 3 In the embodiment, the first valve head 23.1 is in the open position and the second valve head 23.2 is in the closed position. Therefore, the inlet pressure is below a given threshold and the fluid leaves through the first outlet 132.1.

[0102] When the fluid pressure is greater than a given threshold, the first valve head 23.1 is in a closed position, the second valve head 23.2 is in an open position, and the fluid leaves through the second outlet 132.2.

[0103] There is also an embodiment in which the first valve head 23.1 is configured to move from an open position to a closed position when the fluid pressure is higher than a first threshold, and the second valve head 23.2 is configured to move from a closed position to an open position when the fluid pressure is higher than a second threshold. Therefore, if the first threshold is greater than the second threshold, when the fluid pressure is between the first threshold and the second threshold, the first valve head 23.1 and the second valve head 23.2 are in an open position, and the fluid can leave through the first outlet 131.1 and the second outlet 131.2. If the first threshold is lower than the second threshold, when the fluid pressure is between the first threshold and the second threshold, the first valve head 23.1 and the second valve head 23.2 are in a closed position, and the fluid cannot flow out of either the first outlet 132.1 or the second outlet 132.2.

[0104] The invention is not limited to the examples that have just been described, and many adjustments may be made to these examples without departing from the context of the invention.

Claims

1. A cleaning fluid spraying system (100), comprising: - a first nozzle (140.1) and a second nozzle (140.2), each nozzle being capable of receiving a cleaning fluid and spraying the cleaning fluid from the spraying system, for example onto a first protective surface and a second protective surface of the sensor, respectively; - A directional valve (130), comprising an inlet (131), a first outlet (132.1) and a second outlet (132.2), wherein when the pressure of the cleaning fluid received at the inlet is below a given threshold, the directional valve is capable of directing the cleaning fluid from the inlet to the first outlet, and when the pressure of the cleaning fluid received at the inlet is above the given threshold, the directional valve is capable of directing the cleaning fluid from the inlet to the second outlet.

2. The spray system of claim 1, wherein: The first nozzle (140.1) has at least one first optimal operating value, and the second nozzle (140.2) has at least one second optimal operating value different from the first optimal operating value, wherein the first optimal operating value of the first nozzle is associated with a first cleaning fluid inlet pressure below the given threshold, and wherein the second optimal operating value of the second nozzle is associated with a second cleaning fluid inlet pressure above the given threshold.

3. The spray system of claim 2, wherein: The at least one first optimal operating value is a flow value of the first nozzle (140.1) and / or an inlet pressure value of the first nozzle, and wherein the at least one second optimal operating value is a flow value of the second nozzle (140.2) and / or a pressure value of the second nozzle.

4. The spraying system according to any one of claims 1 to 3, wherein: The first nozzle (140.1) is of a first type defining a first relationship between a nozzle flow rate value and a nozzle inlet pressure value, wherein the second nozzle (140.2) is of a second type defining a second relationship between a nozzle flow rate value and a nozzle inlet pressure value.

5. A spraying system according to any one of the preceding claims, wherein: The first nozzle (140.1) is of a first type and the second nozzle (140.2) is of a second type, wherein the first type and the second type are selected from the following: - Fixed single nozzle; -Fixed double nozzle; -Retractable single nozzle; - a telescopic spray boom comprising a number of nozzles; and - A fixed spray bar in the form of an arc, for example a circle or a semicircle, comprising several nozzles.

6. A spraying system according to any one of the preceding claims, wherein: The first nozzle (140.1) is a telescopic single nozzle, and the second nozzle (140.2) is a fixed spray bar in the form of an arc, such as a circle or a semicircle, and includes a plurality of nozzles.

7. The spraying system according to any one of claims 1 to 5, wherein: The first nozzle (140.1) is a telescopic single nozzle, and the second nozzle (140.2) is a telescopic rod including a plurality of nozzles.

8. A spraying system according to any one of the preceding claims, wherein: The directional valve (130) comprises a piston (134) in contact with a spring (135), the piston being able to slide in the directional valve to adopt a balanced position depending on the position of the spring and the pressure of the cleaning fluid entering the directional valve, wherein the position of the spring is adjustable by means of an adjusting element (136) in such a way as to modify the given threshold value.

9. The spray system of claim 8, wherein: The adjustment element (136) is a screw which, when a rotation is applied to the screw, is able to move the position of the spring (135) so as to modify the given threshold value.

10. A spraying system according to any one of the preceding claims, wherein: The directional valve comprises: a first connecting channel through which a fluid can flow, said first connecting channel being connected to said inlet and said first outlet, - a first valve head, the first valve head being provided with a first loading device, the first valve head being movable in the first connecting channel between an open position when the pressure of the fluid is below the given threshold and a closed position when the pressure of the fluid is above the given threshold, - a second connecting channel through which a fluid can flow, said second connecting channel being connected to said inlet and said second outlet, - a second valve head (320), the second valve head being provided with a second loading device, the second valve head being able to move in the second connecting channel between an open position when the pressure of the fluid is higher than the given threshold and a closed position when the pressure of the fluid is lower than the given threshold, The first connecting passage is configured to be closed when the first valve head moves from its open position to its closed position, and the second connecting passage is configured to be closed when the second valve head moves from its open position to its closed position.

11. A component comprising a spraying system as claimed in any of the preceding claims, and at least a first protective surface of a sensor and a second protective surface of a sensor, the first nozzle being configured to spray a fluid onto the first protective surface and the second nozzle being configured to spray a fluid onto the second protective surface.

12. The assembly of claim 11, further comprising a first sensor configured to transmit and / or receive signals through the first protective surface and a second sensor configured to transmit and / or receive signals through the second protective surface.

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