FR2882233A3 - HAIRDRYER PERFECTION. - Google Patents

Abstract

An improved hair dryer having a nozzle attachment (8) adapted to reduce the sectional area of the hot air outlet. It comprises means designed to increase the pressure of the outgoing air to maintain constant airflow even with the nozzle attached. This object is achieved by the particular configuration of the hair dryer, in which two fans (10, 12) are mounted in series, and the body in which the motor and the fans are housed has a constriction (13) immediately upstream of the second fan (12) so that the air blown by the first blower (10) is already at a higher pressure when it enters the second blower, thereby producing a significant increase in the air outlet pressure of the blower (10). 'apparatus. This is achieved without increasing the overall size of the hair dryer, which is therefore particularly practical and convenient to use.

Description

Advanced hair dryer

  An improved hair dryer of the type having a nozzle attachment adapted to reduce the cross-sectional area of the hot air outlet, characterized in that it includes means for increasing the air pressure. outgoing in order to maintain constant airflow even when the nozzle is attached.

  This object is achieved as a result of the particular configuration of the dryer, in which two fans are mounted in series, and the body in which the motor and the fans are housed has a constriction immediately upstream of the second fan so that the air is blown. by the first fan is already at a higher pressure when it enters the second fan, thus producing a significant increase in the air pressure emitted by the device. All of these characteristics are achieved without increasing the overall size of the hair dryer, which is therefore particularly practical and convenient to use.

  All known hair dryers have a structure that includes a tube having a fresh air suction inlet and a heated air outlet and, within said tube, a fan having an electric motor, and a heating element located downstream of the fan. The air outlet is relatively large, to allow the passage of a good flow of air distributed over a large enough surface.

  However, professional users of these devices, such as hairdressers, often prefer to have a more concentrated air jet available to perform particular treatments on a hair loop.

  The solution generally adopted involves fixing on the hot air outlet of the hairdryer a nozzle shaped so as to have a narrow flattened outlet opening, which produces a laminar air jet.

  However, in practice, this solution involves creating a constriction on the outlet, and the resulting pressure drop causes a significant reduction in the airflow, resulting in overheating of the element and the interior parts, the result being that the protective devices are often triggered, interrupting the operation of the hair dryer.

  In order to remedy this problem, hair dryers have been designed containing systems which reduce the current supply of the element, and consequently its temperature, when the nozzle is fixed. However, in addition to a certain manufacturing complexity, this does not solve the problem of reducing airflow caused by the constriction of the outlet nozzle.

  The invention now solves this problem by providing devices which increase the pressure of the air transported to the heating element and therefore to the outlet of the hair dryer, so as to maintain sufficient air flow for removing the amount of heat produced by the element, even when a nozzle which reduces the sectional area of the outlet is fixed thereon.

  The invention solves this problem without the use of complex devices, and above all without affecting the size or handling ability of the apparatus.

  More particularly, the invention uses a twin shaft electric motor on which two fans are connected in series; the first as-eirp fan from the outside, and transports it towards a throat that ends in the entrance area of the second fan.

  The pressure of the air blown towards the throttle increases, and under these conditions the air is transferred to the second blower, which directs it to the outlet.

  Thus, sufficient flow can be maintained by increasing the air pressure, even when a nozzle which reduces the section area of the outlet is attached to the hair dryer.

  The invention will now be described in detail, by way of nonlimiting example only, with reference to the accompanying drawings, in which: FIG. 1 is a view of the hair dryer according to the invention, assembled; 2 shows a nozzle designed to be fixed on the hair dryer; FIG. 3 schematically represents a hair dryer according to the invention, in section.

  As shown in FIG. 1, reference numeral 1 indicates the body of a hair dryer according to the invention, whose housing consists essentially of a tube 2, provided with a handle 3, at the ends of which find an intake of fresh air 4 and u: ze hot air outlet 5.

  A heating element 6 such as a wire heating element, inserted in a tubular end 7 of the body 2, and an electric motor 8 are housed in the body 2.

  The motor 8 has a first output shaft 9 on which is mounted a centrifugal fan 10, and a second output shaft 11, on the opposite side, on which a second fan 12 is mounted.

  The fans 10 and 12 are of the centrifugal type, the air being sucked from a central surface represented by C in the figure and expelled tangentially as indicated by the arrows F in FIG.

  The fan 10, which is located upstream, a -ir the air from the outside and transports it in the direction of the fan 12, which is located downstream.

  The tube 2 is internally shaped as shown in FIG. 2, having a constriction 13 which divides the tube into two adjacent bodies, indicated by the numerals 14 and 15.

  The motor and the fan 10 are housed in the first of these bodies, while the fan 12 and the heating element 6 are housed in the second.

  The throat is located at the point of entry of the air transported to the fan 12, and the wall of the section 14 of the tube has a curved shape in section which narrows increasingly toward the constriction 13.

  The device works as follows.

  When the device is turned on, the electric current drives the motor 8 and the heating element 6, which begins to heat up.

  The motor 8 causes the fans 10 and 12 to rotate simultaneously. The fan 10 draws air from the outside through the inlet c, and expels it peripherally against the wall of the section 14 of the tube 2.

  The air is blown forward towards the front of the apparatus, where the sectional area of the body 14 narrows, causing a consequent increase in the air pressure from the fan 10.

  The air, thus partially compressed, passes through the constriction 13 and is conveyed to the fan 12, which directs it to the heating element 6 and the outlet 5 of the apparatus.

  As a result of the compression exerted by the fan 10 on the air transported to the fan 12, a higher pressure air jet is obtained, which guarantees a sufficient airflow even when a nozzle is attached to the outlet 5 and causes a certain pressure drop by reducing the section area of the outlet.

  The manufacture of a hair dryer according to the invention does not require special components, since the motors used for the usual hair dryer can be used, provided that the shaft is designed to protrude from two sides instead of one, so that the second fan can be inserted into the space generally left between the heating element and the motor.

  The size and handling capacity of the device therefore remain virtually unchanged, and the weight that professionals are used to handling remains the same.

  Different embodiments, relating to the same solution idea, can be devised, all of which are considered to fall within the scope of the invention.

Claims (5)

  Hair dryer of the type comprising a body (1) constituted by a tube (2) which receives a motor (8) which drives means (10, 12) designed to produce an air flow and, downstream of said means a heating device (6) constituted by an electric heating element installed upstream of a hot air outlet (5), characterized in that said means (10, 12) designed to produce an air flow are constituted by two fans (10, 12) installed in series and driven by the same motor (8).   2. Hair dryer according to claim 1, wherein a first fan (10) sucks fresh air from the outside and transports it towards the second fan (12), characterized in that the tube (2) ) which receives the motor and the fans has a constriction (13) immediately upstream of the zone in which the air enters the second fan, so as to increase the pressure of the air blown by the first fan towards the second fan.   3. Hair dryer according to claim 2, characterized in that the first and second fans (10, 12) are centrifugal fans.   4. Hair dryer according to any one of the preceding claims, characterized in that it comprises a motor (8) with twin shaft, the fans (10, 12) being arranged on the common shaft of the engine, opposite ends of it.   5. Hair dryer characterized in that com-30 takes: - a body (1) constituted by a tube (2) defining a fresh air inlet (6), a hot air outlet (5) and a central throttle (13) which divides the tube into two bodies (14, 15), - an electric motor (8) installed in a first (14) of the bodies and a heating element (6) installed in the second (15) of the body, upstream of the hot air outlet, - a first fan (10) mounted on the shaft (9) of the engine, upstream thereof, near the fresh air inlet (C) a second fan (12), mounted on the motor shaft (11) on the opposite side of the motor with respect to the first fan (10), immediately downstream of the throat (13) which extends across the tube; two bodies (14, 15), which constriction forms an opening at the point of entry into the second fan, the first and second fans being - = or two of the centrifugal fans.