Patent Description:
Since the power of inverters is required to be greater and greater while the volume is required to be smaller and smaller, the heat dissipation of the inverter worsens. Therefore, the performance of the fan assembly is required to be continuously improved, and the air volume of the fan assembly needs to be increased, hence the rotation speed of the fan assembly is higher and higher. However, the increase of the wind speed may increase the fundamental frequency vibration of the fan assembly, resulting in deterioration of the noise and reduction of the sound quality.

Currently, the conventional method for mounting the fan assembly is generally to directly fix a fan body onto a to-be-mounted component through a screw, and mount a fan guard on the fan body. The disadvantage of this method is that the vibration of this structure may be intensified after the rotation speed of the fan body increases, which is very easy to excite the natural frequency of the member in contact with the structure, thus the resonance is formed and the vibration generated by the rotation of the fan assembly is increased. In addition, since the fan body and the fan guard are mounted close to each other, when the fan body rotates at a high speed, the air flows through the fan guard and forms a high-order vortex, which increases the aerodynamic noise and the noise generated by the rotation of the fan assembly.

<CIT> discloses a fan assembly, comprising:a fan body and a noise reduction mounting member; wherein the fan body is arranged to directly face an air inlet, and the air inlet is covered by a fan guard; and the noise reduction mounting member is arranged at the fan body, to provide a preset distance between the fan body and the fan guard, and the noise reduction mounting member is configured to mount the fan body and the fan guard at a fan bracket in a buffered manner, wherein the air inlet is provided on the fan bracket, wherein the noise reduction mounting member comprises: a vibration damper arranged between the fan guard and the fan body, and a fastener configured to connect the fan guard, the vibration damper and the fan body with each other.

Some embodiments of the disclosed technology are summarily set out below, however, the invention is defined by the accompanying claims.

An object according to the present application is to provide a fan assembly, which can not only prevent the resonance from being formed between a fan body and a to-be-mounted component (e.g., a fan bracket), but also reduce aerodynamic noises and improve sound quality.

Another object according to the present application is to provide an inverter using the fan assembly, which can not only prevent the resonance from being formed between the fan body and the to-be-mounted component, but also reduce the aerodynamic noise and improve the sound quality under the condition of ensuring efficient heat dissipation of the inverter.

In order to achieve the above objects, the following technical solutions are provided according to the present application.

A fan assembly includes a fan body and a noise reduction mounting member, the fan body is arranged to directly face an air inlet, and the air inlet is covered by a fan guard; the noise reduction mounting member is arranged at the fan body, to provide a preset distance between the fan body and the fan guard, and the noise reduction mounting member is configured to mount the fan body and the fan guard at a fan bracket in a buffered manner. The air inlet is provided on the fan bracket, the noise reduction mounting member includes a vibration damper arranged between the fan guard and the fan body, and the vibration damper is fixed on the fan bracket; and a fastener configured to connect the fan guard, the vibration damper and the fan body with each other, the vibration damper includes: a vibration damping pad fixed on the fan bracket, a through hole is provided in the vibration damping pad; a bushing arranged in the through hole of the vibration damping pad; and a gasket arranged on the bushing, the fastener passes through the fan guard, the gasket, the bushing and the fan body successively to connect the fan guard, the gasket, the bushing and the fan body with each other, a clamping groove is circumferentially provided on an outer periphery of the vibration damping pad, and the fan bracket is clamped and fixed in the clamping groove.

In an embodiment, the vibration damping pad is a rubber pad or a spring.

In an embodiment, a height of the vibration damper is greater than or equal to <NUM>.

In an embodiment, the noise reduction mounting member further includes a nut screwed on the fastener and abutting against the fan body.

In an embodiment, the fan body is integrally formed with the noise reduction mounting member.

In an embodiment, multiple noise reduction mounting members are provided, and the multiple noise reduction mounting members are arranged spaced apart along a circumferential direction of the fan body.

In an embodiment, multiple fan bodies are provided, and the multiple fan bodies are arranged spaced apart on the fan bracket.

An inverter includes the fan assembly according to the above solutions.

In an embodiment, the inverter further includes a box and heat dissipation fins arranged on the box, where the fan assembly is arranged to directly face the heat dissipation fins, and the fan assembly is configured to dissipate heat for the heat dissipation fins.

The beneficial effects according to the present application are as follows.

The fan assembly is provided according to the present application, which includes the fan guard, the fan body and the noise reduction mounting member. The fan body is arranged to directly face the air inlet, the fan guard covers the air inlet, so as to ensure air circulation. The noise reduction mounting member is arranged at the fan body, to provide the preset distance between the fan body and the fan guard, so as to prevent the fan body and the fan guard from being mounted close to each other, the distance between the fan body and the fan guard is increased, which avoids the formation of high-order vortex when the air flows through the fan guard, thereby reducing the aerodynamic noise and improving the sound quality. In addition, the noise reduction mounting member can mount the fan body on the to-be-mounted component in a buffered manner, so that the noise reduction mounting member plays a vibration isolation function between the fan body and the to-be-mounted component, the energy generated by the vibration of the fan body is dissipated by the noise reduction mounting member, thus the excitation of the fan body on the to-be-mounted component becomes small, which increases the loss in transmission of the vibration of the fan body, thereby reducing the noise caused by the vibration of the fan body and improving the sound quality.

The inverter employing the fan assembly is provided according to the present application, which can not only avoid the formation of resonance between the fan body and the to-be-mounted component, but also reduce the aerodynamic noise and improve the sound quality under condition of ensuring efficient heat dissipation of the inverter.

In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the present application will be further explained below in conjunction with the drawings and embodiments.

As shown in <FIG>, a fan assembly <NUM> is provided according to this embodiment, the fan assembly <NUM> is generally used to dissipate heat for an inverter, but is not limited to this, and it may also be used to dissipate heat for other devices.

Specifically, as shown in <FIG>, the fan assembly <NUM> according to this embodiment includes a fan bracket <NUM>, a fan guard <NUM> and a fan body <NUM>. An air inlet <NUM> is provided in the fan bracket <NUM>, the fan guard <NUM> is configured to cover the air inlet <NUM>, the fan body <NUM> is mounted on the fan bracket <NUM> and is arranged to directly face the air inlet <NUM>, the fan guard <NUM> can ensure the circulation of air at the air inlet <NUM> and can also protect the fan body <NUM>, to prevent foreign matters from entering the fan body <NUM> and causing danger, and avoid accidental touch of the fan body <NUM>, thereby ensuring personal safety. The fan body <NUM> rotates so that the air passes through the fan guard <NUM> from the air inlet <NUM> to realize air circulation and realize ventilation and heat dissipation.

However, the conventional method for mounting the fan assembly <NUM> is generally to directly fix the fan body <NUM> on the fan bracket <NUM> through a screw. The disadvantage of this method is that the vibration of this structure may be intensified after the rotation speed of the fan body <NUM> increases, which is very easy to excite the natural frequency of the member in contact with the structure, thus the resonance is formed and the vibration generated by the rotation of the fan assembly <NUM> is increased. In addition, since the fan body <NUM> and the fan guard <NUM> on the fan bracket <NUM> are mounted close to each other, when the fan body <NUM> rotates at a high speed, the air flows through the fan guard <NUM> and forms a high-order vortex, which increases the aerodynamic noise and the noise generated by the rotation of the fan assembly <NUM>.

In order to solve the above problems, as shown in <FIG>, the fan assembly <NUM> according to the present application includes a noise reduction mounting member <NUM>, the noise reduction mounting member <NUM> is arranged at the fan body <NUM>, to provide a preset distance between the fan body <NUM> and the fan guard <NUM>, so as to prevent the fan body <NUM> and the fan guard <NUM> from being mounted close to each other, the distance between the fan body <NUM> and the fan guard <NUM> is increased, which avoids the formation of high-order vortex when the air flows through the fan guard <NUM>, thereby reducing the aerodynamic noise and improving the sound quality.

In addition, the noise reduction mounting member <NUM> can mount the fan body <NUM> on the fan bracket <NUM> in a buffered manner, so that the noise reduction mounting member <NUM> plays a vibration isolation function between the fan body <NUM> and the fan bracket <NUM>, the energy generated by the vibration of the fan body <NUM> is dissipated by the noise reduction mounting member <NUM>, the excitation of the fan body <NUM> on the fan bracket <NUM> becomes small, which increases the loss in transmission of the vibration of the fan body <NUM>, thereby reducing the noise caused by the vibration of the fan body <NUM> and improving the sound quality.

Preferably, as shown in <FIG>, multiple noise reduction mounting members <NUM> are provided, and the multiple noise reduction mounting members <NUM> are arranged spaced apart along a circumferential direction of the fan body <NUM>, which can not only ensure the stable mounting between the fan body <NUM> and the fan bracket <NUM>, but also further increase the consumption of energy generated by the vibration of the fan body <NUM>, and thereby improving the sound quality.

An inverter employing the fan assembly <NUM> is provided according to the present application, which can not only avoid the formation of the resonance between the fan body <NUM> and the fan bracket <NUM>, but also reduce the aerodynamic noise and improve the sound quality under condition of ensuring efficient heat dissipation of the inverter.

In this embodiment, as shown in <FIG>, the inverter further includes a box <NUM> and heat dissipation fins <NUM>. The heat dissipation fins <NUM> are arranged on the box <NUM>, which can dissipate heat for elements inside the box <NUM>, to ensure the normal operation of the inverter. The fan assembly <NUM> is arranged to directly face the heat dissipation fins <NUM>, and the fan assembly <NUM> is used to dissipate heat for the heat dissipation fins <NUM>, so as to further improve the heat dissipation effect of the heat dissipation fins <NUM> for the elements inside the inverter. Specifically, the fan assembly <NUM> is arranged to directly face to air ducts on the heat dissipation fins <NUM>, which can accelerate the air circulation on the heat dissipation fins <NUM>, and thereby improving the heat dissipation effect of the fan assembly <NUM> on the heat dissipation fins <NUM>.

Specifically, as shown in <FIG>, the fan bracket <NUM> is L-shaped, one side wall of the fan bracket <NUM> is fixed to the box <NUM>, another sidewall of the fan bracket <NUM> is configured to mount the fan body <NUM> and the fan guard <NUM>, so that the fan body <NUM> is arranged to directly face the air ducts on the heat dissipation fins <NUM>. The fan bracket <NUM> is designed to be L-shaped, which not only increases a mounting area between the fan bracket <NUM> and the box <NUM> to ensure that the fixing between the fan assembly <NUM> and the box <NUM> is more stable, but also is beneficial to ensuring that the fan body <NUM> and the air ducts on the heat dissipation fins <NUM> are arranged to directly face each other, to ensure the heat dissipation effect.

Preferably, as shown in <FIG>, multiple fan bodies <NUM> are provided, the multiple fan bodies <NUM> are arranged spaced apart on the fan bracket <NUM>, and the multiple fan bodies <NUM> are arranged spaced apart along a distribution direction of the heat dissipation fins <NUM>, so as to further improve the heat dissipation effect of the fan assembly <NUM> on the heat dissipation fins <NUM>, and ensure the normal operation of the inverter.

The specific structure of the noise reduction mounting member <NUM> is illustrated in conjunction with <FIG>. As shown in <FIG>, the noise reduction mounting member <NUM> includes a vibration damper <NUM> and a fastener <NUM>, the vibration damper <NUM> is arranged between the fan guard <NUM> and the fan body <NUM>, the vibration damper <NUM> is fixed on the fan bracket <NUM>, and the fastener <NUM> is configured to connect the fan guard <NUM>, the vibration damper <NUM> and the fan body <NUM> with each other. This arrangement can ensure the buffered mounting between the fan bracket <NUM> and the fan body <NUM>, so that the energy generated by the vibration of the fan body <NUM> is dissipated by the vibration damper <NUM>. The fastener <NUM> can pass through the fan guard <NUM>, the vibration damper <NUM> and the fan body <NUM> successively to connect the fan guard <NUM>, the vibration damper <NUM> and the fan body <NUM> with each other, which can avoid the problem of resonance of the fastener <NUM> to a certain extent. Specifically, the fastener <NUM> may be a bolt, which can realize the detachable mounting between the fan guard <NUM>, the vibration damper <NUM> and the fan body <NUM>. The bolt also has the advantages of high reliability and low cost.

As shown in <FIG> and <FIG>, the vibration damper <NUM> includes a vibration damping pad <NUM>, a bushing <NUM> and a gasket <NUM>. The vibration damper <NUM> is fixed on the fan bracket <NUM>, a through hole <NUM> is provided inside the vibration damping pad <NUM>, the bushing <NUM> is arranged in the through hole <NUM> of the vibration damping pad <NUM>, the gasket <NUM> is arranged on the bushing <NUM>, and the fastener <NUM> passes through the fan guard <NUM>, the gasket <NUM>, the bushing <NUM> and the fan body <NUM> successively to connect the fan guard <NUM>, the gasket <NUM>, the bushing <NUM> and the fan body <NUM> with each other. The bushing <NUM> and the gasket <NUM> are provided, which can not only ensure the stable connection of the fastener <NUM> with the fan guard <NUM> and the fan body <NUM>, to ensure the tightness of the assembly, but also further improve the vibration damping effect of the vibration damper <NUM>, to realize consumption of the vibration of the fan body <NUM> through multi-layer buffering.

Furthermore, as shown in <FIG>, a clamping groove <NUM> is circumferentially provided on an outer periphery of the vibration damping pad <NUM>, and the fan bracket <NUM> is clamped and fixed in the clamping groove <NUM>, which can not only ensure that the vibration damping pad <NUM> be more firmly clamped on the fan bracket <NUM>, but also increase a contact area between the vibration damping pad <NUM> and the fan bracket <NUM>, and further increase the anti-vibration and vibration-absorbing effect of the vibration damping pad <NUM>.

Specifically, as shown in <FIG>, a first mounting hole <NUM> is provided in the fan guard <NUM>, a second mounting hole <NUM> is provided in the fan body <NUM>, and the fastener <NUM> passes through the first mounting hole <NUM>, the gasket <NUM>, the bushing <NUM> and the second mounting hole <NUM> successively to connect the fan guard <NUM> with the fan body <NUM>. The above connection mode has the advantages of compact structure, ingenious design and easy mounting. It should be noted that in this embodiment, a third mounting hole <NUM> is provided in the fan bracket <NUM>, and the vibration damping pad <NUM> passes through the third mounting hole <NUM> and is clamped and fixed in the third mounting hole <NUM> through the clamping groove <NUM>.

Preferably, the vibration damping pad <NUM> is a rubber pad, which has certain elasticity, good vibration damping effect and vibration-absorbing effect, in addition, the rubber pad has a stable structure, is not easy to damage and has low cost. It should be noted that in other embodiments, the vibration damping pad <NUM> may be a spring, which has good elasticity and low cost.

In order to ensure the reliable mounting of the fastener <NUM>, as shown in <FIG>, the noise reduction mounting member <NUM> further includes a nut <NUM>, which is screwed on the fastener <NUM> and abuts against the fan body <NUM>, so as to prevent the fastener <NUM> from falling off and ensure a more stable and reliable connection. It should be noted that the second mounting hole <NUM> is a threaded hole, so as to ensure the reliability of the fastener <NUM>.

Preferably, in this embodiment, the preset distance between the fan body <NUM> and the fan guard <NUM> is greater than or equal to <NUM>, with this preset distance, the generation of high-order vortex noise of the fan body <NUM> can be avoided, which effectively reduces the aerodynamic noise of the fan body <NUM> and improves the sound quality.

The principle of obtaining the preset distance is described hereinafter. For the vortex formed by the air flowing through the fan guard <NUM>, a sound pressure equation considering only the influence of a dipole source is as follows.

Where, p is a sound pressure, r is a distance from a coordinate origin to a point in the sound source field, Fi is a pulse force per unit volume, x is a position vector of a field point, y is a position vector of a source point, and τ is a delay time. In order to obtain the explicit relationship between the sound pressure p and aerodynamic force in sound source field, Hemholz equation is introduced: <MAT>.

A far-field frequency-domain sound pressure formula of the fan body <NUM> under cylindrical coordinate system is derived from the above formulas: <MAT>.

Further, a sound pressure spectral density function can be obtained as follows: <MAT>.

Where, Φ is an autopower spectral density function of the whole sound source, k0 = ω /a<NUM> (a<NUM> is the sound velocity, ω is the circular frequency), β is the angle of the field point in cylindrical coordinates, and γ is an average mounting angle of blades. It can be seen from the sound pressure spectral density function that the sound pressure spectral density is inversely proportional to the square of the distance between the vortex generated by the fan guard <NUM> and the blades on the fan body <NUM>. The smaller the distance is, the greater the sound pressure spectral density is (that is, the greater the noise is). The greater the distance is, the smaller the sound pressure spectral density is. When the distance reaches a certain value, the sound pressure spectral density tends to become a stable value. Therefore, in this embodiment, based on this principle and combined with the experiments, it is established that the preset distance between the fan body <NUM> and the fan guard <NUM> is greater than or equal to <NUM>.

In order to ensure that the preset distance between the fan body <NUM> and the fan guard <NUM> is greater than or equal to <NUM>, a height of the vibration damper <NUM> is greater than or equal to <NUM>. It should be noted in this embodiment that, since a thickness of the gasket <NUM> is negligible, it is only necessary to ensure that a height of the bushing <NUM> is greater than or equal to <NUM>.

Since a size of the fan assembly <NUM> is directly related to a weight of the fan assembly <NUM>, and a natural frequency of the fan assembly <NUM> is negatively correlated with the weight of the fan assembly <NUM>, that is, the larger the size of the fan assembly <NUM> is, the greater the weight is, the lower the natural frequency of the fan assembly <NUM> is, and the easier it is to excite the lower-order natural frequency of the fan assembly <NUM>. In addition, in a case that the specification of the fan assembly <NUM> is different, the wind speed at the air inlet <NUM> is different, and the flow field characteristics at the air inlet <NUM> are also different. If the distance between the fan body <NUM> and the fan guard <NUM> at the air inlet <NUM> is kept unchanged, the greater the wind speed at the air inlet <NUM> is, the greater the vortex noise is. Therefore, the height of the vibration damper <NUM> according to this embodiment can be adjusted according to the size and specification of the fan body <NUM> on the fan assembly <NUM>, so as to ensure that the vibration damper <NUM> can avoid the generation of high-order vortex noise and reduce the aerodynamic noise for the fan assembly <NUM> of different sizes or specifications.

The structure of the fan assembly <NUM> in this embodiment is substantially the same with that in the first embodiment. The difference between the fan assembly <NUM> in this embodiment and the fan assembly in the first embodiment is that the fan body <NUM> is integrally formed with the noise reduction mounting member <NUM>.

Specifically, as shown in <FIG>, the fan body <NUM> and the vibration damping pad <NUM> are integrally formed, which improves the connection stability between the fan body <NUM> and the vibration damping pad <NUM>, and facilitates the mounting of the fan body <NUM> on the fan bracket <NUM>, which only requires to clamp the clamping groove <NUM> of the vibration damping pad <NUM> into the third mounting hole <NUM>.

Obviously, the above embodiments of the present application are merely examples for clear illustration of the present application, which are not intended to limit the implementation of the present application. For those skilled in the art, other changes or modifications in different forms may be made on the basis of the above illustration.

Claim 1:
A fan assembly (<NUM>), comprising:
a fan body (<NUM>) and a noise reduction mounting member (<NUM>); wherein
the fan body (<NUM>) is arranged to directly face an air inlet (<NUM>), and the air inlet is covered by a fan guard (<NUM>); and
the noise reduction mounting member (<NUM>) is arranged at the fan body (<NUM>), to provide a preset distance between the fan body (<NUM>) and the fan guard (<NUM>), and the noise reduction mounting member (<NUM>) is configured to mount the fan body (<NUM>) and the fan guard (<NUM>) at a fan bracket (<NUM>) in a buffered manner,
wherein the air inlet (<NUM>) is provided on the fan bracket (<NUM>),
wherein the noise reduction mounting member (<NUM>) comprises:
a vibration damper (<NUM>) arranged between the fan guard (<NUM>) and the fan body (<NUM>), and the vibration damper (<NUM>) is fixed on the fan bracket (<NUM>); and
a fastener (<NUM>) configured to connect the fan guard (<NUM>), the vibration damper (<NUM>) and the fan body (<NUM>) with each other, characterised in that the vibration damper (<NUM>) comprises:
a vibration damping pad (<NUM>) fixed on the fan bracket (<NUM>), wherein a through hole (<NUM>) is provided in the vibration damping pad (<NUM>);
a bushing (<NUM>) arranged in the through hole (<NUM>) of the vibration damping pad (<NUM>); and
a gasket (<NUM>) arranged on the bushing (<NUM>), wherein the fastener (<NUM>) passes through the fan guard (<NUM>), the gasket (<NUM>), the bushing (<NUM>) and the fan body (<NUM>) successively to connect the fan guard (<NUM>), the gasket (<NUM>), the bushing (<NUM>) and the fan body (<NUM>) with each other,
wherein a clamping groove (<NUM>) is circumferentially provided on an outer periphery of the vibration damping pad (<NUM>), and the fan bracket (<NUM>) is clamped and fixed in the clamping groove (<NUM>).