EP-3745564-B1 - DAMPING MEANS OF AN ELECTRIC MOTOR OF AN AIRFLOW GENERATING APPARATUS AND SAID APPARATUS COMPRISING THE DAMPING MEANS

Inventors

• BACH-ESTEVE BURCH, ALBERT

Dates

Publication Date

20260506

Application Date

20190531

Claims (7)

1. Damping means for an electric motor (M) for an airflow generating apparatus having an imaginary rotational central axis (X), said damping means comprising: - a first part (1') which is adapted to be axially fixed to the electric motor (M); - a second part (2') which is adapted to be axially fixed to the airflow generating apparatus, the first part (1') and the second part (2') being separated from one another and aligned in axial direction with a damping element (3) which is elastically deformable and has a longitudinal extension arranged between said first and second part (1', 2'), characterized in that the damping element (3) comprises at least one central wall (3.1), such that according to the longitudinal extension the central wall (3.1) has two longitudinal ends (3.A) and two elongated sides (3.B), with a first wall (3.2) attached to the central wall (3.1) along to one of the elongated sides (3B) and fixed to the first part (1'), and a second wall (3.3) attached to the central wall (3.1) along to the other elongated side (3B) and fixed to the second part (2'), and in that at least one of the two longitudinal ends (3.A) of the at least one central wall (3.1) is defined to form an angle with respect to the first part (1') such that an imaginary transverse surface containing the at least one of the two longitudinal ends (3.A) is defined parallel to an imaginary joining line (A) between a center of masses (CM) of the at least one central wall (3.1) and a center of gravity (G)of the electric motor (M).
2. Damping means according to claim 1, wherein there are at least two damping elements (3), the damping elements (3) being angularly distributed with respect to the imaginary central axis (X).
3. Damping means according to claims 1 or 2, wherein there are two central walls (3.1) arranged in a parallel or converging manner with respect to one another.
4. Damping means according to any one of claims 1 to 3, wherein the at least one central wall (3.1) has an elongated laminar configuration.
5. Damping means according to any one of claims 1 to 4, wherein the damping element (3) is configured such that an imaginary longitudinal line can be defined parallel to the imaginary central axis (X) and through the at least one central wall (3.1) from one of the two elongated sides (3.B) to the other one of the two elongated sides (3.B).
6. An airflow generating apparatus comprising damping means according to any one of the preceding claims.
7. The airflow generating apparatus according to claim 6, wherein it additionally comprises an electric motor (M), which in turn comprises a stator (M.1) and a rotor (M.2) for generating a rotational movement, and at least one blade arranged for suctioning and driving air.

Description

Field of the Art The present invention relates to the industry dedicated to airflow generating apparatus, such as air extractors and fans, and more specifically to the industry dedicated to controlling the temperature of electric motors in said apparatus to prevent noises generated by vibrations during the operation thereof. State of the Art Electric motors for airflow generating apparatus, such as air extractors and fans, are widely known today, said electric motors being formed mainly by two parts, i.e., a rotor and a stator. Both the stator and the rotor are discontinuous means, given that they have singular points, which can be referred to as polarities. Therefore, when the rotor rotates while the stator remains static, pulsations are produced due to the polarities of the stator clashing in a discontinuous manner with the polarities of the rotor. These pulsations correspond with isolated and repeated rotational impulses transmitted to the blades or vanes fixed with respect to the rotor. According to this, the electric motor provides a motor torque according to said pulsations, i.e., a discontinuous torque as it has peaks and valleys. This operation of the electric motors leads to a tangential vibration of an outer shell of the electric motors themselves. This vibration is the most unwanted in electric motors and is intensified in electronic pole switching (brushless) electric motors the poles of which in the rotor are formed by magnets. Said tangential vibration is the source of noise and, when transmitted to adjacent elements mechanically attached to the electric motor, in turn causes these elements to vibrate, thereby amplifying the noise generated. Furthermore, electric motors are arranged fixed or fastened to a structural element of the apparatus at a rear longitudinal end, i.e., opposite the end where the corresponding blades are located. According to this cantilever arrangement of the electric motors, they tend to bend due to the action of gravity such that the blades contact the side walls radially and externally surrounding them. This contact generates noise, in addition to damage to the blades and/or said side walls. In view of these problems, the solution that is conventionally used consists of utilizing, as an intermediate element between the electric motor and the structural element for fixing the motor, an element made of an elastically deformable material for absorbing tangential vibrations and minimizing the bending or drop of the front longitudinal end where the blades are located. Depending on the characteristics typical of the corresponding electric motor, such as weight, longitudinal extension, and motor torque to be generated, for example, the element is provided according to a larger or smaller thickness. However, this solution is not efficient in practice because the electric motor must be radially held with considerable strength or rigidity, while at the same time having certain capacity to move tangentially, i.e., certain capacity to rotate with respect to an imaginary longitudinal central axis thereof, which cannot be optimally afforded by means of the element as an intermediate element between the electric motor and the structural element for fixing the motor According to said solution that is conventionally used, the electric motor is held either insufficiently so as to prevent the blades form contacting the side walls of the compartment of the motor itself or excessively such that the tangential or rotational movement is transmitted to the adjacent elements mechanically attached to the electric motor. Unwanted noise is generated in either of the two cases or in both cases. In view of the described drawback or limitation of the solutions existing today, a solution which allows absorbing tangential vibrations and preventing the bending or drop of the front longitudinal end where the blades are located. For instance, EP 0926803 A2 describes a device for vibration-isolating mount of a motor, DE 19936178 A1 describes an arrangement for a vibration insulating support of an electric motor, and DE 102015001447 A1 describes a decoupling ring for an electric motor. Object of the Invention In order to achieve this objective and solve the technical problems described up until now, in addition to providing additional advantages which can be derived hereinafter, the present invention provides damping means for an electric motor for an airflow generating apparatus in accordance with claim 1. Likewise, the present invention provides an airflow generating apparatus in accordance with claim 6. Description of the Drawings Figure 1 shows a schematic perspective view of damping means of an electric motor of an airflow generating apparatus objects of the invention.Figure 2 shows an exploded schematic view of the damping means and the electric motor.Figure 3 shows a schematic side view of the damping means.Figure 4 shows a schematic sectional side view of the damping means with the electric motor a