Patent Description:
The present disclosure relates to the technical field of air treatment, in particular to an air purification device, a fan and centrifugal fan impellers of the fan.

In the disclosure of fans applied to the household appliance industry, with the improvement of people's quality of life, the requirements for indoor air quality are getting higher and higher, and the types of various filter elements and resistance components in air treatment device are increased. This poses a huge challenge to the static pressure resistance of the fans.

Currently, the air treatment device usually adopts forward centrifugal fans to guarantee the flowing of airflow. When a forward centrifugal fan is in use, the greater the angle between the exit angle of a blade and the tangential direction of an impeller, the stronger the static pressure resistance of the fan. However, the flow velocity of the airflow at the air outlet of the forward centrifugal fan is maximal, and the flow loss of the airflow is proportional to the second power of the flow velocity, so the flow loss of the airflow is large, resulting in low efficiency.

The present disclosure provides a centrifugal fan impeller, including a hub and a plurality of fan blades, wherein said plurality of fan blades are distributed around the periphery of the hub; and
each fan blade includes a first blade section and a second blade section; each first blade section is in a backward blade form; and each second blade section is in a forward blade form.

In some embodiments, the first blade section and the second blade section are connected in series.

In some embodiments, the first blade section is connected with the hub, and the second blade section is disposed away from the hub.

In some embodiments, the curvature radius of the first blade section is greater than that of the second blade section.

In some embodiments, the range of the ratio of the curvature radius of the first blade section to the curvature radius of the second blade section is <NUM> to <NUM>.

In some embodiments, the blade entrance angle of the first blade section ranges from <NUM>° to <NUM>°;
and/or, the blade exit angle of the second blade section ranges from <NUM>° to <NUM>°.

In some embodiments, each fan blade further includes a connecting blade section which smoothly connects the first blade section with the second blade section.

In some embodiments, the first blade sections of every two adjacent fan blades form a first flow channel, and each first flow channel causes the airflow to flow at the same speed;
and/or, the second blade sections of every two adjacent fan blades form a second flow channel, and each second flow channel gradually increases the flow speed of the airflow.

In some embodiments, the first flow channel is equal width flow channel;
and/or, the second flow channel includes a divergent flow channel and a convergent flow channel, and the outlet of the divergent flow channel is in communication with the inlet of the convergent flow channel.

In some embodiments, the ratio of the width at the inlet of the first flow channel to the width at the outlet of the first flow channel ranges from <NUM> to <NUM>;
and/or, the ratio of the width at the inlet of the diverging flow channel to the width at the outlet of the convergent flow channel ranges from <NUM> to <NUM>, and the ratio of the width at the inlet of the convergent flow channel to the width at the outlet of the convergent flow channel ranges from <NUM> to <NUM>.

In some embodiments, the first blade sections of every two adjacent fan blades form a first flow channel; the second blade sections of every two adjacent fan blades form a second flow channel; the connecting blade sections of every two fan blades form a third flow channel; and each third flow channel smoothly connects the corresponding first flow channel with the corresponding second flow channel.

In some embodiments, the first flow channel, the third flow channel and the second flow channel are sequentially connected in an arc shape.

In some embodiments, each fan blade further includes a connecting blade section which connects the first blade section with the second blade section, and the first blade section, the connecting blade section and the second blade section form an integrated structure.

A fan, including the centrifugal fan impeller described according to any of the above-mentioned technical features.

An air treatment device, including the fan described according to any of the above-mentioned technical features.

In order to make the objectives, technical solutions and advantages of the present disclosure clearer, the air treatment device, the fan and the centrifugal fan impellers of the fan of the present disclosure will be further described below in detail through embodiments. It should be understood that the specific embodiments described herein are only intended for explaining instead of limiting the present disclosure.

The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequence or technical meaning. The terms "connection" and "junction" mentioned in the present disclosure, unless otherwise specified, both include direct and indirect connection (junction). In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for conveniently describing the present disclosure and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation and be constructed and operated in a specific orientation, and therefore it cannot be understood as a limitation of the present disclosure.

In the present disclosure, unless expressly stated and defined otherwise, the first feature is "on" or "under" the second feature may mean that the first feature and the second feature have direct contact, or the first feature and the second feature have indirect contact through an intermediary. Moreover, the first feature is "above", "over", and "on" the second feature may mean that the first feature is directly above or diagonally above the second feature, or it only means that the horizontal height of the first feature is greater than that of the second feature. The first feature is "below", "under" and "underneath" the second feature may mean that the first feature is directly below or diagonally below the second feature, or it only means that the horizontal height of the first feature is less than that of the second feature.

With reference of <FIG>, the present disclosure provides a centrifugal fan impeller <NUM>, and the centrifugal fan impeller <NUM> is applied to a fan of an air treatment device and is configured to accelerate and pressurize the airflow to realize the output of the airflow. Certainly, the centrifugal fan impeller <NUM> of the present disclosure can also be applied to devices such as air conditioners that require fans. The centrifugal fan impeller <NUM> of the present disclosure can improve the air output efficiency while guaranteeing the static pressure resistance.

In the present disclosure, the centrifugal fan impeller <NUM> includes a hub <NUM> and a plurality of fan blades <NUM>, wherein the plurality of fan blades <NUM> are distributed around the periphery of the hub <NUM>; the hub <NUM> has a bearing function and bears the plurality of fan blades <NUM>; and the fan blades <NUM> guide the airflow to flow. When the centrifugal fan impeller <NUM> rotates, the hub <NUM> is configured to drive the plurality of fan blades <NUM> thereon to rotate, and the fan blades <NUM> guide the airflow to flow, thereby realizing acceleration and pressurized output of the airflow. Moreover, the airflow enters the centrifugal fan impeller <NUM> along the axial direction of the centrifugal fan impeller <NUM> and flows out via the flow channels between the adjacent fan blades <NUM>.

As shown in <FIG>, each fan blade <NUM> includes a first blade section <NUM> and a second blade section <NUM> that is connected with the first blade section <NUM>; the radial bending direction of the first blade section <NUM> is opposite to that of the second blade section <NUM>; moreover, the first blade section <NUM> is in a backward blade form; and the second blade section <NUM> is in a forward blade form.

In some embodiments, the first blade section <NUM> and the second blade section <NUM> are connected in series. In other words, the centrifugal fan impeller <NUM> of the present disclosure realizes serial connection of two different blade forms on one fan blade <NUM>, namely the first blade section <NUM> in a backward blade form and the second blade section <NUM> in a forward blade form are connected in series. Compared with cooperative use of the current forward fans and backward fans, the centrifugal fan impeller <NUM> of the present disclosure can cancel the use of a connecting structure for the above-mentioned two parts, a frame, etc., and thus the overall structure of the centrifugal fan impeller <NUM> is compact.

In some embodiments, the first blade section <NUM> is connected with the hub <NUM>, and the second blade section <NUM> is disposed away from the hub <NUM>. In other words, the first blade section <NUM> in a backward blade form is located at the inlet of the centrifugal fan impeller <NUM>, and the second blade section <NUM> in a forward blade form is located at the outlet of the centrifugal fan impeller <NUM>. Certainly, in other embodiments of the present disclosure, the first blade section <NUM> in a backward blade form is located at the outlet of the centrifugal fan impeller <NUM>, and the second blade section <NUM> in a forward blade form is located at the inlet of the centrifugal fan impeller <NUM>.

Moreover, the radial bending direction of the first blade section <NUM> refers to the direction of an arc-shaped recess of the first blade section <NUM>, and the radial bending direction of the second blade section <NUM> refers to the direction of an arc-shaped recess of the second blade section <NUM>. The radial bending direction of the first blade section <NUM> is opposite to that of the second blade section <NUM>, that is, the direction of the arc-shaped recess of the first blade section <NUM> is opposite to the direction of the arc-shaped recess of the second blade section <NUM>, so that the blade in a forward blade form and the blade in a backward blade form can be connected in series; meanwhile the flow channel formed by the adjacent fan blades <NUM> can further be bent, so that sound wave is reflected and refracted a plurality of times in the flow channel, thus sound energy is effectively dissipated, a blade channel sound insulation effect is achieved in a propagation route, the sound radiation energy is reduced, thereby achieving the effect of reducing noises.

As one implementable embodiment, the curvature radius of the first blade section is greater than that of the second blade section <NUM>. In other words, the first blade section <NUM> adopts a blade in a backward blade form with a larger curvature radius, and the second blade section <NUM> adopts a blade in a forward blade form with a smaller curvature radius. Compared to a simplex blade form, the flow channel formed by the adjacent fan blades <NUM> is relatively narrow and long, so that the sound wave is refracted and reflected a plurality of times when propagating in the flow channel, thereby effectively dissipating the sound energy, achieving a sound insulation effect in the propagation route and reducing the sound radiation energy. Further, the ratio of the curvature radius of the first blade section <NUM> to the curvature radius of the second blade section <NUM> ranges from <NUM> to <NUM> in order to further reduce the sound radiation energy.

Furthermore, the blade entrance angle of the first blade section <NUM> ranges from <NUM>° to <NUM>°. After the blade entrance angle of the first blade section <NUM> is within the above-mentioned range, it can be matched with an airflow inlet angle, so that the airflow can flow along the extension direction of the first blade section <NUM>, which reduces the impact generated by the airflow to the first blade section <NUM>, thereby reducing the noises generated during running of the centrifugal fan impeller <NUM> and guaranteeing stable running of the centrifugal fan impeller <NUM>. The blade exit angle of the second blade section <NUM> ranges from <NUM>° to <NUM>°. The output direction of the air can be determined by the blade exit angle of the second blade section <NUM>, thus the airflow blows out along the second blade section <NUM> with the blade exit angle to guarantee the static pressure resistance. The blade exit angle of the second blade section <NUM> is within the above-mentioned range to guarantee the static pressure resistance requirement of the centrifugal fan impeller <NUM>.

After the first blade section <NUM> at the inlet of the centrifugal fan impeller <NUM> adopts a blade in a backward blade form, since the flow channel formed by the first blade sections <NUM> which are in a backward blade form is small in curvature rate, the attack angle of the airflow inlet can be reduced; the impact generated by the airflow to the blades is small; the impact loss at the inlet is reduced, so the natural impact noise is low, the energy loss is minimal, and the air output efficiency can be improved. Moreover, the first blade section <NUM> is a blade in a backward blade form, which can also facilitate the adjustment of the entrance angle of the fan blade <NUM>. It can be understood that the convenient adjustment here refers to the convenient adjustment of the blade entrance angle of a backward blade form; furthermore, the adjustment refers to the adjustment of the blade entrance angle of the first blade section <NUM> in formation design of the centrifugal fan impeller <NUM>, so that the blade entrance angle of the first blade section <NUM> is matched with the inlet airflow, thus during running of the centrifugal fan impeller <NUM>, the airflow can flow along the extension direction of the first blade section <NUM>, so direct impact generated by the airflow to the first blade section <NUM> is reduced, thereby achieving the aim of reducing the noises generated during running of the centrifugal fan impeller <NUM>.

The second blade section <NUM> at the outlet of the centrifugal fan impeller <NUM> adopts a blade in a forward blade form, which can make the airflow outputted smoothly without swirling between adjacent fan blades <NUM>, and can effectively inhibit the formation of a vortex area at the outlet, so that the airflow flows out along the fan blades <NUM>, thereby improving the static pressure resistance of the centrifugal fan impeller <NUM> and guaranteeing the air volume. Thus, to some units having relatively high requirements on static pressure resistance, the second blade section <NUM> in a forward blade form can ensure that the air volume is not attenuated based on high static pressure resistance.

According to the invention, the fan blade <NUM> further includes a connecting blade section <NUM> which smoothly connects the first blade section <NUM> with the second blade section <NUM>. The connecting blade section <NUM> achieves a connection function and builds a connection between the first blade section <NUM> and the second blade section <NUM>. Meanwhile, the connecting blade section <NUM> can realize smooth transition between the flow channel between the first blade sections <NUM> and between the second blade sections <NUM>, thus making the airflow flow stably and reducing the loss. According to the invention, the connecting blade section <NUM> is a linear segment by which the first blade section <NUM> is connected with the second blade section <NUM>.

As an implementable embodiment, the first blade sections <NUM> of every two adjacent fan blades <NUM> form a first flow channel A1. Each first flow channel A1 causes the airflow flow at the same velocity. Optionally, the first flow channel A1 is equal width flow channel. The equal width flow channel here means that the width between the inner walls of the first flow channel A1 is substantially equal everywhere. That is, the section width of the equal width flow channel is substantially constant, which can reduce the vortex areas in the first flow channel A1; as the separation of the airflow in the first flow channel A1 is reduced, energy dissipation between the fan blades <NUM> is reduced, so that the efficiency of the centrifugal fan impeller <NUM> is improved.

In some embodiments, the width L1 at the inlet of the first flow channel is smaller than the width L2 at the outlet of the first flow channel. It can be understood that the inlet position of the first flow channel A1 refers to the position of the end where the first flow channel A1 is connected with the hub <NUM>, and the outlet position of the first flow channel A1 refers to the position of the end where the first flow channel A1 is away from the hub <NUM>. In this embodiment, the outlet position of the first flow channel A1 refers to the position connected with the connecting blade section <NUM>. In other words, the width from the end of the first flow channel A1 connected with the hub <NUM> to the end far away from the hub <NUM> is substantially equal, so that the first flow channel A1 forms a constant-velocity flow channel. Thus, the airflow can realize uniform-velocity flowing when flowing in the first flow channel A1, thereby reducing the loss. Moreover, the width refers to the width between two adjacent first blade sections <NUM>.

Further, the ratio of the width L1 at the inlet of the first flow channel A1 to the width L2 at the outlet of the first flow channel A1 ranges from <NUM> to <NUM>. By constructing the first blade sections <NUM> according to the design parameter, the width between adjacent first blade sections <NUM> is substantially the same, and the air flow velocity of the first flow channel A1 is ensured to be consistent. Furthermore, the ratio of the width at any position of the first flow channel A1 to the width L1 at the inlet of the first flow channel A1 ranges from <NUM> to <NUM>. Thus, the first flow channels A1 are ensured to be constant-velocity flow channels.

As an implementable embodiment, the second blade sections <NUM> of every two adjacent fan blades <NUM> form a second flow channel A2. Each second flow channel A2 gradually increases the flow velocity of the airflow. Optionally, the second flow channel include a divergent flow channel and a convergent flow channel, and the outlet of the divergent flow channel is in communication with the inlet of the convergent flow channel. In the divergent flow channel, the width between the inner walls of the second flow channel A2 is gradually increased, and in the convergent flow channel, the width between the inner walls of the second flow channel A2 is gradually reduced. In other words, the second flow channel A2 formed by the adjacent second blade sections <NUM> are gradually divergent and then convergent.

The divergent flow channel is connected with the first flow channel A1 formed by the first blade sections <NUM>, and the smooth connection between the divergent flow channel and the first flow channelA1 can reduce the loss of the flow channel to increase the energy of output air, thereby improving the static pressure resistance. The width between the inner walls of the convergent flow channel close to the air outlet side is reduced, the flow area of the same air volume is reduced, which will correspondingly increase the velocity of the airflow at the outlet, and thus the convergent blade form can effectively eliminate unevenness of the flow velocity at the outlet and reduce diffusion of the airflow, thereby weakening the jet-wake influence at the outlet.

The width L3 at the inlet of the second flow channel A2 is greater than the width L5 at the outlet of the second flow channel A2. It can be understood that the width at the inlet of the second flow channel A2 refers to that at the position of the end of each second flow channel A2 close to the corresponding first flow channel A1; in this embodiment, the width at the inlet of the second flow channel A2 refers to that at the position of the joint of each second blade section <NUM> and the corresponding connecting blade section <NUM>; and the outlet of each second flow channel A2 refers to the tail end of the corresponding fan blade <NUM>. In other words, the width from the end of each second flow channel A2 connected with the corresponding connecting blade section <NUM> to the end far away from the corresponding connecting blade section <NUM> is firstly large and then small, so that the second flow channel A2 forms an accelerating flow channel. Thus, when the airflow flows in the second flow channels A2, the second flow channels A2 can accelerate the airflow.

Further, the ratio of the width at the inlet of the divergent flow channel to the width at the outlet of the convergent flow channel ranges from <NUM> to <NUM>, and the ratio of the width at the inlet of the convergent flow channel to the width at the outlet of the convergent flow channel ranges from <NUM> to <NUM>. Namely, the width L3 at the inlet of the second flow channel A2 to the width L5 at the outlet of the second flow channel A2 ranges from <NUM> to <NUM>. The ratio of the width at the inlet of the convergent flow channel to the width at the outlet of the second flow channel A2 ranges from <NUM> to <NUM>. Moreover, as shown in <FIG>, the width in the second flow channel A2 is firstly increased and then reduced to achieve acceleration of the airflow.

Optionally, the length of the first blade section <NUM> along the radial direction is equal to that of the second blade section <NUM> along the radial direction. If the second blade section <NUM> is too short, it will be difficult to form an acceleration process of the airflow and the static pressure resistance will be insufficient. If the second blade section <NUM> is too long, although the static pressure resistance will be improved, the noise of the airflow will be large and the efficiency will be greatly reduced as well. Moreover, due to the limitation of the diameter of the centrifugal fan impeller <NUM>, if the first blade section <NUM> is too long, the corner at the joint of the first blade section <NUM> and the second blade section <NUM> will be too large, the blade profile line will be not smooth, and the strong airflow at the corner will form a concentrated vortex area in the flow channel, resulting in swirling of the airflow in the flow channel, which will cause a disadvantage for air output. Therefore, the setting of equal length of the first blade section <NUM> and the second blade section <NUM> can reduce noise, guarantee efficiency, and facilitate flowing of the airflow while guaranteeing the static pressure resistance.

As an implementable embodiment, the connecting blade sections <NUM> of every two adjacent fan blades <NUM> form a third flow channel A3, and each third flow channel A3 smoothly connects the first flow channel A1 with the corresponding second flow channel A2. Thus, the flow channels for the airflow can be ensured to be smooth, the flow loss of the airflow can be reduced, and the output air volume can be guaranteed. Moreover, the width at the inlet of the third flow channel A3 is less than the width L3 at the inlet of the second flow channel A2, and the width at the inlet of the third flow channel A3 is greater than the width L2 at the outlet of the first flow channel A1. In other words, the width between the third flow channel A3 is gradually increased along the flow direction of the airflow so as to achieve smooth connection between the first flow channel A1 and the second flow channel A2.

As shown in <FIG>, optionally, the first flow channel A1, the third flow channel A3 and the second flow channel A2 are sequentially and smoothly connected in an arc shape, thereby guaranteeing smooth flow channels and low loss.

Further optionally, the first blade section <NUM>, the connecting blade section <NUM> and the second blade section <NUM> form an integrated structure. Thus, the fan blade <NUM> can be easy to process and shape, reliable connection is guaranteed, and meanwhile the assembly efficiency can also be improved. Moreover, the first blade section <NUM>, the connecting blade section <NUM>, the second blade section <NUM> and the hub <NUM> may also be integrally formed.

The design parameters of the centrifugal fan impeller <NUM> of a specific embodiment of the present disclosure are as follows: the hub ratio of the first blade section <NUM> (the ratio of the diameter of the end where the first blade section <NUM> is connected with the hub <NUM> to the diameter of the end where the first blade section <NUM> is connected with the connecting blade section <NUM>) is <NUM>; the hub ratio of the second blade section <NUM> (the ratio of the diameter of the end where the second blade section <NUM> is connected with the connecting blade section <NUM> to the diameter of the tail end of the second blade section <NUM>) is <NUM>; the blade entrance angle of the first blade section <NUM> is <NUM>°; the blade exit angle of the second blade section <NUM> is <NUM>°; the central angle of the first blade section <NUM> is <NUM>;, the central angle of the second blade section <NUM> is <NUM>°; the arc radius of the first blade section <NUM> is <NUM>; and the arc radius of the second blade section <NUM> is <NUM>. Thus, the airflow can flow into the centrifugal fan impeller <NUM> along the first blade section <NUM> to reduce the impact caused by the airflow to the fan blade <NUM> at the inlet, reduce the impact noise, can also improve the flowing of the airflow at the inlet of the fan blade <NUM>, inhibit flow division and increase the output air volume; the second blade section <NUM> can inhibit the formation of vortex at the outlet, and improve the static pressure resistance, so that the centrifugal fan impeller <NUM> guarantees the air output efficiency as well as has a compact structure and reduces the noises generated during running of the centrifugal fan impeller <NUM>.

The present disclosure further provides a fan, including a motor and a centrifugal fan impeller <NUM>. An output shaft of the motor is connected with the hub <NUM> of the centrifugal fan impeller <NUM> to realize rotation driving of the centrifugal fan impeller <NUM>, thereby realizing accelerated output of the airflow. After the fan of the present disclosure adopts the above-mentioned centrifugal fan impeller <NUM>, it can improve the static pressure resistance, guarantee the air output efficiency, reduce the noises generated during running of the fan, and guarantee stable and reliable running of the fan.

The present disclosure further provides an air treatment device, including a filter component and a fan; the filter component may be arranged at the air inlet end of the fan or at the air outlet end of the fan; the filter component filters the air to achieve purification and dust removal of the air; and the fan realizes accelerated flowing of airflow. After the air treatment device of the present disclosure adopts the above-mentioned fan, it can improve the static pressure resistance, guarantee the air output efficiency, reduce the noises generated during running of the fan, guarantee stable and reliable running of the fan, and improve the comfort level of the user during use.

The technical features of the above-mentioned embodiments can be combined randomly; in order to make the description concise, not all possible combinations of the various technical features in the above-mentioned embodiments are described, however, as long as there is no contradiction in the combinations of these technical features, all should be considered as the scope of this specification.

Claim 1:
A centrifugal fan impeller, comprising a hub (<NUM>) and a plurality of fan blades (<NUM>) distributed around the periphery of the hub (<NUM>); and
wherein each fan blade (<NUM>) comprises a first blade section (<NUM>) and a second blade section (<NUM>) connected with the first blade section (<NUM>);
each first blade section (<NUM>) is in a backward blade form; and
each second blade section (<NUM>) is in a forward blade form;
characterized in that each fan blade (<NUM>) further comprises a connecting blade section (<NUM>) which smoothly connects the first blade section (<NUM>) with the second blade section (<NUM>), the connecting blade section (<NUM>) is a linear segment by which the first blade section (<NUM>) is connected with the second blade section (<NUM>).