114 results about "Air line" patented technology

The invention discloses an automatic cleaning system and method for a laser radar on an intelligent mine truck, and the system comprises a vehicle-mounted laser radar, an intelligent driving domain controller, a cleaning system controller, a cleaning liquid pot module, an air storage tank module, an air pump, a liquid path electromagnetic valve, an air path electromagnetic valve, a nozzle module and the like, and forms a vehicle-mounted laser radar cleaning air path and a laser radar cleaning liquid path. All the modules are connected into the whole system through wire harnesses, a gas path is matched with a liquid path, the integration degree is high, and the cleaning strength is high; the smoothness of an air path is ensured through an air pump, an air path electromagnetic valve and a pressure sensor, and a liquid path nozzle is heated in a low-temperature environment through an electronic water pump, a temperature sensor and a liquid path electromagnetic valve, so that the liquid path nozzle is not frozen, and the smoothness of the liquid path is ensured; the cleaning method comprises the steps of cleaning request, cleaning process, detection after cleaning, gas path and liquid path circulation switching in the cleaning process, cleaning liquid residue is avoided, and the cleaning requirement is met.

A system and method are provided for using a pneumatic line as a backup communication channel for first and secondary park brake controllers. In one embodiment, a park brake system is provided comprising a first park brake controller and a second park brake controller. The first park brake controller is configured to selectively alter air pressure in an air line of a vehicle to pneumatically communicate a message to the second park brake controller after a loss of electronic communication with the second park brake controller. Other embodiments are provided.

The invention discloses a pneumatic horizontal dock gate untwisting maintenance method which comprises the following steps: S1, a preparation stage: a tidal bulkhead and a seaport seal hole form a closed left cabin and a closed right cabin, an air pipeline and a plurality of groups of bollards are connected to a B surface of a dock gate, two groups of floating cranes are prepared, and temporary winches are mounted at the head parts of the floating cranes; s2, degumming: utilizing two groups of floating cranes to hook the dock gate and take cables, enabling the floating cranes to abut against the dock gate in a T-shaped mode, injecting water into the dry dock to enable the dock gate to lie flat, and lifting the dock gate through the cooperation of the two groups of floating cranes to realize untwisting and floating; and S3, dock gate docking maintenance: two tugs are adopted to pull the front and back cables of the dock gate end to end, and the dock gate is dragged to be docked for maintenance. A sling and an air pipeline are installed at one end of the dock gate, the other end of the dock gate is connected with a tug, dock gate reinstallation is basically a twist-off reverse operation process, and the dock gate reinstallation comprises the steps of tidal bulkhead / seaport hole sealing, air pipeline connection and bollard installation on the B face of the dock gate. The safety of the dock gate in the dismantling and reinstalling process can be guaranteed.

The invention provides an air suspension fault diagnosis method, device and equipment and a readable storage medium, and the method comprises the steps that in the process that an air pump inflates a target object, the change condition of a first target parameter is monitored, and the first target parameter at least comprises the pressure of an air pipeline where the air pump and the target object are located; if the change condition of the first target parameter meets a first condition, an air pipeline between the air pump and the target object is cut off, the change condition of a second target parameter is monitored, and the second target parameter at least comprises the pressure of the air pipeline where the air pump is located; and determining a reason for abnormal inflation of the target object by the air pump according to the change condition of the second target parameter. Through the method and the device, the reason for abnormal inflation of the target object by the air pump can be accurately diagnosed, so that the maintenance difficulty is reduced, and the maintenance efficiency is improved.

A coupling head (10) for a coupling of a rail vehicle is provided with a coupling housing (15) forming a contact surface (11) at its front, at least one air coupling (20) with an air line (25) leading from the contact surface (11) to the rear (15') of the coupling housing (15), and a valve element (30) opening and closing the latter. This valve element (30) is located at the rear of the coupling housing (15). It has a plunger (31) and a movable adjusting element that opens or closes the air line (25). The air line (25), which extends transversely to the contact surface (11) on the coupling housing (15), is formed without right-angle bends up to the rear (15') of the coupling housing (15), with at least one approximately straight line section (27) and slightly curved line sections (26, 28). With this training or arrangement of the air duct orWith the air coupling, less pressure drop is achieved in the couplings connected in series on the rail vehicles of trains at a given operating pressure of the main air line.

The invention relates to a nozzle (1) for activating a coating material (5) by means of a fluid, having a nozzle body (2) with a supply-air inlet (8), a supply-air line (4) and a first outlet (3), wherein the supply-air inlet (8) and the first outlet (3) have a flow connection (7) to one another through the supply-air line (4). In order to permit energy-saving operation of a nozzle, the nozzle body has a working surface (6) with an exhaust-air inlet (9) and an exhaust-air outlet (12), wherein the exhaust-air inlet (9) and the exhaust-air outlet (12) have a flow connection (10) to one another.

The utility model discloses a trailer air pipe protection device, including the steel ring, the steel ring is provided with several, and the adjacent steel ring is connected with several first springs, and the steel ring at both ends all are connected with fixed block through connecting rope, and the fixed block is fixed with the ribbon, and the ribbon is provided with equidistance arrangement's locating boss, and the fixed block is opened with first through -hole, second through -hole, third through -hole that communicate in proper order, and the ribbon slidingly penetrates first through -hole, and the second through -hole is slidably installed with the sliding block, and the sliding block is connected with second spring between the inner wall of second through -hole, and the sliding block is fixed with the plug -in block, the utility model discloses through the steel ring can protect the air pipe, and, through the contraction of first spring can assist air pipe contraction, avoid the problem that air pipe cannot contract because of aging.

The invention relates to a nozzle (1) for activating a coating material (5) by means of a fluid, comprising a nozzle body (2) with an air supply inlet (8), an air supply line (4), and a first outlet (3), wherein the air supply inlet (8) and the first outlet (3) are in flow communication (7) with each other via the air supply line (4). To enable energy-saving standby operation of the nozzle, the nozzle body has a working surface (6) with an exhaust air inlet (9) and an exhaust air outlet (12), wherein the exhaust air inlet (9) and the exhaust air outlet (12) are in flow communication (10) with each other.

The invention relates to a compressed-air supply unit (10) for a vehicle (50), having: an air compressor (12), which can be connected or is connected to an air supply (11), for providing compressed air (13) at a compressed-air provision connection (15), wherein the air compressor (12) has an air compressor housing (16); a drying device (18), which can be connected or is connected to the compressed-air provision connection (15) via a compressed-air supply line (17), for drying the compressed air (13) provided at the compressed-air provision connection (15), wherein the drying device (18) can be operated in a drying mode (19) and in a regeneration mode (20); a compressed-air supply connection (22), which can be connected or is connected to the drying device (18) via a compressed-air supply line (21), for providing dried compressed air (13) at the compressed-air supply connection (22) in the drying mode (19) of the drying device (18); a regeneration-air line (23) for connecting the compressed-air supply connection (22) or a regeneration-air connection to the drying device (18) for dehumidifying the drying device (18) with regeneration air (14) provided at the compressed-air supply connection (22) or at the regeneration-air connection in the regeneration mode (20) of the drying device (18); and a venting line (24) for connecting the drying device (18) to a vent (25) for discharging the regeneration air (14), wherein the drying device (18) is arranged outside the air compressor housing (16) and the regeneration-air line (23) has a heat transfer portion (26) which is arranged inside the air compressor housing (16).

The utility model relates to a gas-liquid split-phase injection and absorption expansion evaporation system, and belongs to the field of heat pumps and refrigeration equipment. A heat exchanger is connected between the condenser and the evaporator, an outlet pipeline of the evaporator is connected with a tube pass inlet of the heat exchanger through a main liquid line, the outlet pipeline of the evaporator is connected with a shell pass inlet of the heat exchanger through a main gas line, and a tube pass outlet of the heat exchanger is connected with a main liquid distributor through a main liquid outlet pipeline. A shell pass outlet of the heat exchanger is connected with a main gas distributor through a main gas outlet pipeline, and a main gas distribution line of the main gas distributor and a main liquid distribution line of the main liquid distributor are combined and connected to each inlet of the evaporator. According to the utility model, the expansion injection phenomenon is realized, and the refrigerant circulation speed is improved. And the liquid-phase refrigerant entering the condenser is atomized, so that the evaporation effect is improved. Liquid cannot be accumulated on the bottom pipelines of the condenser and the evaporator, and the effect can be completely achieved. Gas-liquid separation is complete, the evaporation effect is good, no liquid enters the compressor, and the service life of the compressor is prolonged.

A gas circuit for a pneumatic actuator, comprising an air intake unit, a positioning unit, a valve unit and a pneumatic actuator connected in series on an air source connection pipeline; the air intake unit is connected to an air source; the valve unit comprises two air control valves for supplying air in and out respectively; the positioning unit is used to adjust the valve unit, and comprises a power-off position-keeping module and an air-off position-keeping module; the power-off position-keeping module can play a position-keeping role when a power failure or power failure occurs; the two ends of the power-off position-keeping module are respectively connected to the air source and the air control valve; the air-off position-keeping module can play a position-keeping role when an air source failure or the air source is cut off; one end of the air-off position-keeping module is connected to the power-off position-keeping module, the other end of the air-off position-keeping module is connected between the air intake unit and the valve unit, and the third end of the air-off position-keeping module is connected to the air source. In this way, the positioning unit can provide a position-keeping role when a power failure or air failure occurs.

An air compressor load management device. The air compressor load management device may include a supply air inlet; a first valve; a controller; a sensor; a regulator; a second valve; a supply air outlet; and a sensing line, wherein the sensor is configured to sense an air pressure at the supply air outlet, and wherein depending on the sensed air pressure at the supply air outlet the sensor signals the controller to cause the first valve to one of send air received from the supply air inlet to the regulator, send air received from the supply air inlet directly to the second valve via the full pressure air line, or to not send any air.

The invention relates to the technical field of supply systems, in particular to a multifunctional medium supply system which mainly solves the technical problem that an existing supply system is narrow in application range. The system comprises a gas supply device, a medium storage device and a pump supply device, gas extrusion supply can be achieved through a main gas path, a branch gas path I, a storage tank, a gas extrusion supply branch and a supply main path, and extrusion gas with accurate pressure can be supplied through closed-loop control formed by a controllable pressure reducer I and a pressure sensor I; the storage tank is suitable for occasions with small pressure and high precision requirements, and meanwhile the flow requirements of different occasions can be met through the multiple storage tanks arranged in series; pump supply can be achieved through the pump supply branch and the supply trunk, the working precision of the proportioning valve can be guaranteed through closed-loop control formed by the controllable pressure reducer II and the pressure sensor II, and the system is suitable for occasions with large pressure. Therefore, the system can be suitable for various occasions with different requirements, and the application range is wide.

The utility model discloses a pressure switch testing device and a vehicle, and relates to the vehicle field, the pressure switch testing device is internally provided with a pressure sensor, a controller, a pressure switch motion detection plug and a switch module, the controller is firstly used to control the switch module to be turned on, so that air enters an air pipeline where a pressure switch is located; the state of the pressure switch after air inflow is collected through the pressure switch action detection plug, the pressure of the pressure switch is collected through the pressure sensor, and finally the controller can determine whether the pressure switch breaks down or not in time based on the state of the pressure switch and the pressure of the pressure switch; and timely determining whether the rail vehicle where the pressure switch is located has a fault or not.

The invention belongs to the technical field of automobiles, and relates to an aerodynamic rim blade assembly and a using method thereof. The air pipeline is communicated with the compressed air supply unit; the blade movement mechanism is arranged on the rim blade and comprises an air cylinder and a blade which is in transmission connection with a piston rod of the air cylinder; wherein the air pipeline extends to the wheel end and is communicated with a working cavity of the air cylinder, an electromagnetic valve controlled by an electronic control unit of the whole vehicle is arranged on the air pipeline, and compressed air can be selectively guided into or discharged out of the working cavity of the air cylinder by controlling opening and closing of the electromagnetic valve. The driving device is used for driving the blades to move between the opening position and the closing position. A mature compressed air supply unit of the whole vehicle is directly shared, the development and manufacturing cost of the system is greatly reduced, meanwhile, the layout of the whole vehicle is simplified, and popularization and application of the assembly are more economic and feasible.

The invention relates to a method for operating a compressed-air supply system (1), which supplies compressed air to connected compressed-air consumers (16, 18; 20) via at least one compressed-air line (24), wherein the compressed-air supply system has at least one compressor (2), an air dryer (5) and a switchover valve (12), the air dryer (5) having a granular adsorption desiccant (10), the switchover valve being actuable by means of an electronic control device (14), in a first switching position (A) of the switchover valve (12) moist compressed air generated by the compressor being passed over the grains of the adsorption desiccant in a drying phase, as a result of which the adsorption desiccant absorbs atmospheric moisture from the moist compressed air, and in a second switching position (B) of the switchover valve (12) dry compressed air taken from the compressed-air supply system being passed over the grains of the adsorption desiccant in a regeneration phase, as a result of which the adsorption desiccant releases moisture to the dry compressed air, which is then subsequently discharged to the surrounding area (28). According to the invention, a water load value indicating the current water load of the adsorption desiccant is ascertained in the control device, the water load value is determined by means of at least two numerical values, and the switchover valve (12) is controlled with respect to the start and the duration of the drying phase and / or the regeneration phase depending on the water load value.

The utility model discloses an air compressor integrated system which comprises an air compressor main body, an air inlet is formed in one end of the air compressor main body, an air flow meter and a temperature and pressure sensor are arranged at the air inlet, an outlet of the air compressor main body communicates with an inlet of an intercooler, the intercooler is arranged above the air compressor main body, and the air flow meter and the temperature and pressure sensor are arranged on the air compressor main body. An outlet of the intercooler and the air inlet are located on the same side, and a temperature sensor is arranged in the intercooler. The intercooler, the flow meter, the temperature and pressure sensor and the air compressor are integrated into a whole, so that the space occupied by an air pipeline in a system is greatly reduced, and the complexity of a special-shaped rubber pipe is reduced.

A bladder control system for a two-phase pump loop (TPPL) includes an air compressor, an air line connected to the air compressor, first and second solenoid valves located along the air line, a refrigerant tank having a port operatively connected to the TPPL for selective flow of refrigerant between the refrigerant tank and the TPPL, an expandable bladder located within the refrigerant tank and having a port connected to the air line between the first and second solenoid valves for selective flow of air between the expandable bladder and the air line, and a controller. The controller selectively expands and contracts the expandable bladder to control flow of refrigerant out of the refrigerant tank to the TPPL and into the refrigerant tank from the TPPL for maintaining the system refrigerant pressure within a desired tight range. This is particularly useful for obtaining tight temperature control at the thermal load.

Device (1) for cleaning a plate heat exchanger (2), wherein the device (1) has the following features: a. A compressed air source (3) for providing compressed air for dry cleaning of the plate heat exchanger (2); b. A control box (4) which is connected to the compressed air source (3) via a first compressed air line (5) and to a slot nozzle (9) via a second compressed air line (8), wherein an electrically controllable valve (6) is arranged in the control box (4) between the compressed air lines (5, 8) connected to the control box (4), wherein the valve (6) is designed to open when actuated, so that compressed air flows to the slot nozzle (9); c. The slot nozzle (9) has at least one nozzle gap (16) which is surrounded circumferentially by a slot-shaped mouthpiece (11) which projects in the direction of flow (P) of the compressed air opposite the at least one nozzle gap (16).

The invention discloses an explosion-proof dispersion promoting system for a hydrogen storage area of a hydrogen production and hydrogenation integrated station and application. The explosion-proof dispersion promoting system comprises an air pipeline module and a monitoring communication module. The monitoring module detects leakage through a tank pressure and multi-azimuth hydrogen concentration sensor, an accident judgment unit judges the accident grade and controls a corresponding branch control valve and a main valve to be opened, a high-speed air outlet vertically and upwards sprays airflow, a firewall is matched to guide combustible hydrogen cloud to move to the high position, and dissipation is accelerated by means of natural wind gradient. And fire blast accidents caused by hydrogen cloud gathering are prevented. According to the system, millisecond-level response and directional accurate dispersion promotion are realized, the defects of low dispersion promotion efficiency and no directional response of the existing system are overcome, and the safety of the integrated station is greatly improved.

Compressed air supply unit (10) for a vehicle (50), comprising an air compressor (12) connectable to or connected with an air supply (11) for supplying compressed air (13) at a compressed air supply connection (15), wherein the air compressor (12) has an air compressor housing (16), a dryer unit (18) connectable to or connected with the compressed air supply connection (15) via a compressed air supply line (17) for drying the compressed air (13) supplied at the compressed air supply connection (15), wherein the dryer unit (18) is operable in a drying mode (19) and in a regeneration mode (20), a compressed air supply connection (22) connectable to or connected with the dryer unit (18) via a compressed air supply line (21) for supplying dried compressed air (13) at the compressed air supply connection (22) in the drying mode (19) of the Drying unit (18),a regeneration air line (23) for connecting the compressed air supply connection (22) or a regeneration air connection to the dryer unit (18) for dehumidifying the dryer unit (18) with regeneration air (14) supplied at the compressed air supply connection (22) or at the regeneration air connection during regeneration operation (20) of the dryer unit (18), and a vent line (24) for connecting the dryer unit (18) to a vent (25) for discharging the regeneration air (14), wherein the dryer unit (18) is arranged outside the air compressor housing (16) and the regeneration air line (23) has a heat transfer section (26) which is arranged inside the air compressor housing (16).

Internal combustion engine (10) with an intake manifold (18) by means of which combustion air can be introduced into combustion chambers (16), with an exhaust manifold (20), with an exhaust gas turbocharger (22), with a secondary air system (38), with a secondary air line (40) by means of which at least a portion of the combustion air can be diverted from the intake manifold (18) at a first branch point (A1) arranged downstream of the compressor (26) and introduced as secondary air into the exhaust manifold (20), and has a first valve (42) arranged in the secondary air line (40), and with a recirculating air system (44) which has a first recirculating air line (46), and has a second valve (48) arranged in the first recirculating air line (46) by means of which the quantity of combustion air flowing through the first recirculating air line (46) can be adjusted, comprising: - a second recirculating air line (52) is provided, by means of which at least a part of the combustion air flowing through the secondary air line (40) can be diverted from the secondary air line (40) at a third branch point (A3) arranged upstream of the first valve (42) and downstream of the first branch point (A1) and introduced into the intake tract (18) at a second inlet point (E3) arranged upstream of the compressor (26), - a third valve (50) is provided, which is arranged in the secondary air line (40) upstream of the first valve (42) and upstream of the third branch point (A3), so that the quantity of combustion air flowing through the secondary air line (40) can be adjusted by means of the third valve (50); or is arranged in the second recirculating air line (52), so that the quantity of combustion air flowing through the second recirculating air line (52) can be adjusted by means of the third valve (50); and the second valve (48) and the third valve (50) are to be opened at least temporarily simultaneously in order to avoid pumping of the compressor (26).

The invention discloses a water-cooled wall anti-corrosion system and method with secondary air flow equalization and adherence air cooperation. The system comprises a source adjusting unit, a tail end protection unit, a multi-parameter monitoring network unit and a controller. The source adjusting unit is an adjustable guide vane group in each secondary layer air bellow of the secondary air large air bellow and is in transmission connection with the angle executing mechanism; the tail end protection unit comprises a boiler side wall array type composite adherence air nozzle, an adherence air bellow and a compressed air pipeline, wherein the adherence air bellow and the compressed air pipeline are communicated; the multi-parameter monitoring network unit comprises an air volume sensor, a gas concentration sensor and a temperature sensor which are correspondingly arranged; and the controller is linked with each unit through a cable. According to the system, secondary air distribution can be dynamically adjusted, the stability of wall-attached air is improved, closed-loop regulation and control are achieved, the near-wall reducing atmosphere is eliminated in a two-dimensional mode, and the anti-corrosion effect and the boiler operation safety are improved.

A compressed-air supply system includes at least one compressed-air consumer, compressed-air lines, electrically controllable valves, a compressed-air controller for actuating the valves, a compressor having an electric motor as a drive, and a pressure reservoir. The compressed-air consumer can be pneumatically connected to the compressor and / or the pressure reservoir via the lines and the valves such that the compressed-air supply system can be operated either in an open or in a closed operating mode. The controller has an input for a current signal, which represents a motor current drawn or to be drawn by the electric motor. The controller is configured to actuate the valves in accordance with the open operating mode when a current signal is present at the current signal input, the current signal representing a mean motor current, the magnitude of which is equal to or greater than a maximum value for the motor current.

This invention relates to a testing device for individual modules of a locomotive air piping system, comprising a cabinet, a pressure testing mechanism and an electrical testing mechanism disposed inside the cabinet, and a test bench disposed outside the cabinet for placing the module under test. The pressure testing mechanism includes an air supply pipeline and multiple testing pipelines, and is used to perform airtightness testing on the module under test. The electrical testing mechanism includes a control unit and a drive unit, and is used to perform electrical logic testing on the module under test. An industrial control computer is connected to the electrical testing mechanism and the pressure testing mechanism, and the industrial control computer is used to generate and edit testing instructions. This invention can adapt to various independent module models, performing automatic testing on their airtightness, circuit and air circuit logic, pressure switches, and electric gates, and can also perform manual testing.

A system and method are provided for using a pneumatic line as a backup communication channel for first and secondary park brake controllers (110, 120). In one embodiment, a park brake system is provided comprising a first park brake controller (110) and a second park brake controller (120). The first park brake controller (110) is configured to selectively alter air pressure in an air line of a vehicle to pneumatically communicate a message to the second park brake controller (120) after a loss of electronic communication with the second park brake controller (120).

The invention relates to an electropneumatic brake device of a guided vehicle which can be coupled into a train set with at least one guiding vehicle, comprising a main air line (1) which can be coupled between adjacent vehicles of the train set so as to allow air to pass and actuates the compressed air brakes of the vehicles of the train set and the pressure of which in each guided vehicle can be influenced by means of at least one electrically switchable brake valve (2). The invention also relates to a method for carrying out a brake test using such an electropneumatic brake device. The electropneumatic brake device is intended to allow a reduced complexity and to allow an acceleration with regard to the brake test which is necessary during operation. This is achieved in that the brake device also has a switching means (831, 832) designed to interrupt the energization of the at least one brake valve (2), a sensor means (811, 812) designed to detect a fluidic state variable of the air in the brake valve connection line (11), and a control device (8) with an actuator interface (83) for outputting an actuation signal to the switching means (831, 832) and a first input interface (81) for receiving a state signal of the air in the brake valve connection line (11), said state signal being output by the sensor means (811, 812) after the switching means (831, 832) is actuated.

A vehicle air spring system and methods for controlling vehicle stability using air springs is provided. The vehicle air spring system includes an arrangement of air springs, pressure sensors, one or more air sources, air lines, and air valves that are monitored and regulated by an air pressure and stability control system. The air pressure and stability control system can be configured to utilize pressure sensor data, vehicle driving sensor data, and vehicle stability data to regulate the air pressure of the air springs and stabilize the vehicle. Additionally, the air pressure and stability control system can proactively adjust the air pressure of the air springs in anticipation of a potentially destabilizing event.

The invention relates to an electropneumatic braking device for a guided vehicle that can be coupled into a train consist with at least one leading vehicle. The device comprises a main air line (1) that is air-connectable between adjacent vehicles of the train consist and that controls the compressed air brakes of the vehicles of the train consist. The pressure of this main air line in each guided vehicle can be influenced by means of at least one electrically switchable brake valve (2). The at least one brake valve (2) is vented in the closed state and can be separated from the main air line (1) by means of a shut-off valve (12) arranged between the main air line (1) and the brake valve (2). This is intended to enable a reduction in effort and speed up the operationally necessary brake test.This is achieved by the braking device further comprising an input / output device (8) for outputting input signals receivable via at least one sensor interface (81, 82) to a train bus (9) and for outputting control signals receivable via a train bus (9) to at least one actuator interface (83), an electrical pressure sensor (811) connected to a first sensor interface (81) of the input / output device (8) and detecting the pressure in the air line between the shut-off valve (12) and the at least one brake valve (2), a means (122) connected to a second sensor interface (82) of the input / output device (8) for detecting the switching state of the shut-off valve (12), and a relay (831) connected to an actuator interface (83) of the input / output device (8), the switching contact (832) of which is configured to interrupt the energization of the at least one brake valve (2) when energized.

The invention relates to an airflow direction unit (20) for use in a vehicle cabin ventilator (10), comprising a series of air duct fins (261-263) arranged substantially parallel to each other and spaced apart, the air duct fins (261-263) forming a single-piece structure (26) housed inside a hollow cylindrical body (22) and pivotally connected to it such that they pivot about a first pivot axis (Y2), the cylindrical body (22) being able to pivot about a second pivot axis (X2) under the action of a motor (14), wherein an outer shell (24) at least partially surrounds the cylindrical body (22), said outer shell (24) being provided with a guide groove (25) on an internal peripheral circumference (243), said guide groove (25) defining a cam profile,and wherein a control pin (28) integral with one of the air duct fins is slidably received inside the guide groove (25) such that, when the cylindrical body (22) pivots around the second pivot axis (X2), the control pin (28) follows the cam profile, thus causing the structure (26) to pivot as a single unit around the first pivot axis (Y2). Figure 3,