Fan assembly

Abstract

The utility model provides a fan assembly. The fan assembly comprises a shell, a fan and a heating module. An airflow channel is arranged in the shell, and the shell is provided with an air inlet and an air outlet which are communicated with the airflow channel. The fan comprises a piezoelectric module. The fan is arranged in the airflow channel and located between the air inlet and the air outlet. The piezoelectric module comprises an opening state and a closing state, and in the opening state, the air inlet and the air outlet are intermittently communicated at a set frequency. And in the closed state, the air inlet and the air outlet are separated. The heating module is arranged on the shell. Therefore, the operation noise can be reduced.

Description

Technical Field

[0001] The present specification relates to the field of air supply equipment, and in particular to a fan assembly. Background Art

[0002] Fan components can accelerate air flow and are therefore widely used in production and life. Some fan components use axial fans to drive airflow. To ensure the wind pressure, the speed of the axial fans is required to be high. During use, the blades of the axial fans cut the airflow at high speeds, generating a lot of noise and causing poor user experience. Utility Model Content

[0003] This specification provides a fan assembly that can reduce operating noise.

[0004] This manual provides a fan assembly, including:

[0005] A housing, wherein an air flow channel is provided inside the housing, and the housing is provided with an air inlet and an air outlet communicated with the air flow channel;

[0006] A fan, comprising a piezoelectric module; the fan is disposed in the air flow channel and between the air inlet and the air outlet; the piezoelectric module comprises an on state and a off state, in which the air inlet and the air outlet are intermittently connected at a set frequency; in the off state, the air inlet and the air outlet are isolated; and

[0007] The heating module is arranged on the shell.

[0008] Furthermore, the piezoelectric module comprises a plurality of piezoelectric modules arranged at intervals; in the open state, at least one of the piezoelectric modules is powered on; in the closed state, the plurality of piezoelectric modules are powered off;

[0009] The piezoelectric module includes a module body; the module body is provided with a first air outlet connected to the air inlet and a second air outlet connected to the air outlet; when the piezoelectric module is powered on, the first air outlet and the second air outlet are intermittently connected; when the piezoelectric module is powered off, the first air outlet and the second air outlet are isolated.

[0010] Further, the piezoelectric module includes a plurality of piezoelectric units arranged in an array, and the piezoelectric units include a first mode, a second mode, and a third mode; in the first mode, the first air outlet and the second air outlet are connected; in the second mode and the third mode, the first air outlet and the second air outlet are isolated;

[0011] When the piezoelectric module is powered on, the piezoelectric unit switches between the first mode and the second mode to make the first air outlet and the second air outlet intermittently conductive; when the piezoelectric module is powered off, the piezoelectric unit is in the third mode to isolate the first air outlet and the second air outlet.

[0012] Further, the piezoelectric unit includes a first element and a second element, the first element and the second element are arranged inside the module body, and the second element is located at the second air outlet;

[0013] When the piezoelectric module is powered on, the piezoelectric unit switches between the first mode and the second mode, so that the first element is deformed to provide airflow drive; in the first mode, the second element opens the second air outlet, and the first air outlet and the second air outlet are connected; in the second mode, the second element closes the second air outlet, and the first air outlet and the second air outlet are isolated;

[0014] When the piezoelectric module is powered off, the piezoelectric unit is in a third mode, the first element and the second element are not deformed; the second element closes the second air outlet to isolate the first air outlet from the second air outlet.

[0015] Furthermore, the shell includes an outer shell and a bottom shell, the outer shell is connected to the bottom shell; the outer shell and the bottom shell are enclosed to form the airflow channel; and the heating module is arranged on the bottom shell.

[0016] Furthermore, the outer shell includes a top surface and a side surface connected between the top surface and the bottom shell; the air inlet is arranged on the top surface, and the air outlet is arranged on the side surface; the side surface includes a first surface and a second surface, the first surface extends obliquely from the top surface toward the air outlet, toward the direction close to the bottom shell, and is connected to the second surface.

[0017] Furthermore, the inner wall of the bottom shell is protrudingly provided with a plurality of protrusions extending along a first direction, and the plurality of protrusions are arranged at intervals in a second direction; wherein the first direction is perpendicular to the second direction.

[0018] Furthermore, the heating module is located between the air outlet side of the fan and the air outlet, and is used for heating the airflow discharged to the air outlet.

[0019] Furthermore, the heating module includes a glue layer and a heating layer, and the glue layer is arranged between the heating layer and the shell.

[0020] Furthermore, the adhesive layer is a thermally conductive adhesive; and / or

[0021] The heating layer is an electric heating element.

[0022] The fan assembly provided in this manual uses a piezoelectric module in the open state to deliver high-pressure airflow to the air outlet. Compared with traditional axial flow fans, there is no need to use high-speed rotating fan blades to provide high-pressure airflow, so the noise is lower. The fan uses a piezoelectric module to reduce operating noise and improve the user experience.

[0023] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the specification and, together with the description, serve to explain the principles of the specification.

[0025] Figure 1 Shown is a schematic diagram of a fan assembly according to one embodiment of the present specification;

[0026] Figure 2 Shown Figure 1 A top view of the piezoelectric module of the blower assembly is shown;

[0027] Figure 3 Shown Figure 2 A schematic diagram of a piezoelectric unit of the piezoelectric module shown;

[0028] Figure 4 Shown Figure 2 A schematic diagram of a piezoelectric unit of the piezoelectric module shown in a first mode;

[0029] Figure 5 Shown Figure 2 A schematic diagram of a piezoelectric unit of the piezoelectric module shown in a second mode;

[0030] Figure 6 Shown Figure 2 FIG. 4 is a schematic diagram of a piezoelectric unit of a piezoelectric module in a third mode. DETAILED DESCRIPTION

[0031] This specification provides a fan assembly. The fan assembly of this specification is described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0032] See also Figure 1 As shown, the fan assembly 10 may include but is not limited to a heater, a hair dryer, a dryer, etc. The fan assembly 10 includes a housing 11, a fan 12, and a heating module 13. An air flow channel 14 is provided inside the housing 11, and the housing 11 is provided with an air inlet 15 and an air outlet 16 connected to the air flow channel 14.

[0033] The fan 12 includes a piezoelectric module 17. The piezoelectric module 17 may refer to a MEMS (Micro Electromechanical System) piezoelectric module. MEMS piezoelectric modules have the characteristics of miniaturization, intelligence, multi-function, high integration and suitability for mass production. The fan 12 is arranged in the air flow channel 14 and between the air inlet 15 and the air outlet 16. Among them, the fan 12 can be arranged closer to the air inlet 15 than the air outlet 16. The piezoelectric module 17 of the fan 12 can be used to drive a high-pressure airflow. The piezoelectric module 17 can convert the air input from the air inlet 15 into a high-pressure airflow and transport it to the air outlet 16 through the air flow channel 14. The piezoelectric module 17 includes an open state and a closed state. In the open state, the air inlet 15 and the air outlet 16 are intermittently turned on at a set frequency. Optionally, the set frequency can be above 20000 Hz, so that the air inlet 15 and the air outlet 16 are intermittently connected at high frequency, and the formed high-pressure airflow is transported to the air outlet 16 through the airflow channel 14, so that the air outlet 16 outputs the high-pressure airflow. In this way, the sound frequency can be controlled to a frequency band that cannot be recognized by the human ear, thereby achieving low-noise operation and a better user experience. In the closed state, the air inlet 15 and the air outlet 16 are separated so that the air outlet 16 does not output high-pressure airflow.

[0034] The heating module 13 is disposed on the shell 11. The heating module 13 can be disposed on the inner wall of the shell 11, or on the outer wall of the shell 11. In one embodiment, the heating module 13 is located between the air outlet side of the fan 12 and the air outlet 16, and is used to heat the high-pressure airflow discharged to the air outlet 16. Among them, the air outlet side of the fan 12 can refer to the side that outputs the high-pressure airflow. The heating module 13 can increase the temperature of the shell 11, so that the high-pressure airflow output by the piezoelectric module 17 exchanges heat with the shell 11 to form a warm airflow, and output it from the air outlet 16. The way of forming the warm airflow in this way is simple and highly feasible.

[0035] The fan assembly 10 provided in this specification realizes the delivery of high-pressure airflow to the air outlet 16 through the piezoelectric module 17 in the open state. Compared with the traditional axial flow fan, it does not need to use high-speed rotating fan blades to provide high-pressure airflow, so the noise is lower. The fan 12 adopts the piezoelectric module 17 to reduce the operating noise. At the same time, the design combines the piezoelectric module 17 and the heating module 13 so that the fan assembly 10 can form a warm airflow to provide functions such as warm air drying, thereby improving the user experience.

[0036] In one embodiment, the heating module 13 includes an adhesive layer 18 and a heating layer 19. In one embodiment, the heating layer 19 is an electric heating element. The electric heating element includes but is not limited to a heating resistor, a PTC, etc. The temperature of the warm air flow output from the air outlet 16 can be controlled by controlling the power of the heating layer 19, and the power of the heating layer 19 can be controlled to achieve precise adjustment of the temperature of the output warm air flow. The adhesive layer 18 is disposed between the heating layer 19 and the shell 11. The heating layer 19 can be fixed to the shell 11 by the adhesive layer 18, and the installation method is simple. In one embodiment, the adhesive layer 18 is a thermally conductive adhesive. The heating layer 19 is fixed to the shell 11 by the thermally conductive adhesive. After the heating layer 19 starts to heat, the heat can be effectively transferred to the shell 11, which is beneficial to the heating of the high-pressure airflow.

[0037] In one embodiment, the housing 11 includes an outer shell 20 and a bottom shell 21, and the outer shell 20 is connected to the bottom shell 21. The outer shell 20 is fixedly connected to the bottom shell 21. The outer shell 20 and the bottom shell 21 enclose an airflow channel 14. The heating module 13 is arranged in the bottom shell 21. The fan 12 is arranged in the airflow channel 14, and the heating module 13 is arranged in the bottom shell 21, so that the structural arrangement between the fan 12 and the heating module 13 is more reasonable, which is conducive to the structural design of the fan assembly 10.

[0038] In one embodiment, the material of the bottom shell 21 is a heat-conducting metal, so that after the heating module 13 starts heating, the heat can be effectively transferred to the high-pressure airflow through the bottom shell 21 .

[0039] In one embodiment, the housing 20 includes a top surface 22 and a side surface 23 connected between the top surface 22 and the bottom shell 21. The air inlet 15 is provided on the top surface 22, and the air outlet 16 is provided on the side surface 23. The side surface 23 includes a first surface 24 and a second surface 25, wherein the first surface 24 extends obliquely from the top surface 22 toward the air outlet 16 and toward the direction close to the bottom shell 21, and is connected to the second surface 25. The second surface 25 may be a horizontal surface and may be parallel to the bottom shell 21. The first surface 24 is set as an obliquely extending surface, so that the wind speed can be increased, and it is convenient for the air outlet 16 to output a high-pressure airflow.

[0040] In one embodiment, the inner wall of the bottom shell 21 is provided with a protruding portion along the first direction ( Figure 1 The first direction is perpendicular to the second direction X. The plurality of protrusions (not shown) extend in a direction perpendicular to the paper surface. The shape of the protrusions may be, but is not limited to, tooth-shaped, arc-shaped, square-shaped, etc. The plurality of protrusions are arranged at intervals in the second direction X. The plurality of protrusions may be arranged at intervals evenly in the second direction X. The first direction is perpendicular to the second direction X. The plurality of protrusions may be provided to increase the heat exchange area of ​​the bottom shell 21 and improve the heat exchange amount, which may be beneficial to the heating of the high-pressure airflow.

[0041] See also Figure 1 , Figure 2and Figure 4 As shown, in one embodiment, the piezoelectric module 17 includes a plurality of piezoelectric modules 26 arranged at intervals. The plurality of piezoelectric modules 26 can be arranged in an array. In the on state, at least one piezoelectric module 26 is energized. In this way, the wind speed gear of the fan assembly 10 can be precisely regulated by controlling the number of energized piezoelectric modules 26 in the on state. Among them, the more piezoelectric modules 26 are energized in the on state, the faster the output wind speed. In the off state, the plurality of piezoelectric modules 26 are all powered off. The piezoelectric module 26 includes a module body 27. The module body 27 is provided with a first air outlet 28 connected to the air inlet 15 and a second air outlet 29 connected to the air outlet 16. When the piezoelectric module 26 is energized, the first air outlet 28 and the second air outlet 29 are intermittently conductive. In the on state, at least one piezoelectric module 26 is energized. In this way, the first air vent 28 and the second air vent 29 of at least one piezoelectric module 26 are intermittently connected, so that the air inlet 15 and the air outlet 16 can be intermittently connected, so that the air outlet 16 outputs a high-pressure airflow. When the piezoelectric module 26 is powered off, the first air vent 28 and the second air vent 29 are isolated. In the closed state, multiple piezoelectric modules 26 are all powered off. In this way, the first air vent 28 and the second air vent 29 of each piezoelectric module 26 are isolated, so that the air inlet 15 and the air outlet 16 are isolated, so that the air outlet 16 does not output a high-pressure airflow. Such a setting facilitates the control of the piezoelectric module 17.

[0042] See also Figures 2 to 6 As shown, in one embodiment, the piezoelectric module 26 includes a plurality of piezoelectric units 30 arranged in an array. The number of the first air vents 28 can be multiple, corresponding to the position of the piezoelectric unit 30. The number of the second air vents 29 can be multiple, corresponding to the position of the piezoelectric unit 30. The piezoelectric unit 30 includes a first mode, a second mode and a third mode. Figure 4 As shown, in the first mode, the first air outlet 28 and the second air outlet 29 are connected. Figure 5 and Figure 6As shown, in the second mode and the third mode, the first air outlet 28 and the second air outlet 29 are isolated. When the piezoelectric module 26 is powered on, the piezoelectric unit 30 switches between the first mode and the second mode to make the first air outlet 28 and the second air outlet 29 intermittently conductive. The multiple piezoelectric units 30 of the powered piezoelectric module 26 can all switch between the first mode and the second mode, so that the first air outlet 28 and the second air outlet 29 of the powered piezoelectric module 26 can be intermittently conductive. In the open state, at least one piezoelectric module 26 is powered on, so that the air inlet 15 and the air outlet 16 can be intermittently conductive, so that the air outlet 16 outputs a high-pressure airflow. When the piezoelectric module 26 is powered off, the piezoelectric unit 30 is in the third mode to isolate the first air outlet 28 and the second air outlet 29. The multiple piezoelectric units 30 of the powered-off piezoelectric module 26 can all be in the third mode, so that the first air outlet 28 and the second air outlet 29 of the powered-off piezoelectric module 26 can be isolated. In the closed state, the plurality of piezoelectric modules 26 are all powered off, thereby isolating the air inlet 15 from the air outlet 16, so that the air outlet 16 does not output high-pressure airflow. In this way, the first air outlet 28 and the second air outlet 29 of the piezoelectric module 26 can be intermittently connected and isolated from each other through the piezoelectric unit 30, which is simple to implement and highly feasible.

[0043] In one embodiment, the piezoelectric unit 30 includes a first element 31 and a second element 32. The first element 31 can be used to provide airflow drive, and the second element 32 can be used as a valve switch. The first element 31 and the second element 32 are arranged inside the module body 27, and the second element 32 is located at the second air vent 29. When the piezoelectric module 26 is powered on, the piezoelectric unit 30 switches between the first mode and the second mode, so that the first element 31 is deformed to provide airflow drive. And in the first mode, the second element 32 opens the second air vent 29, and the first air vent 28 and the second air vent 29 are connected. In the second mode, the second element 32 closes the second air vent 29, and the first air vent 28 and the second air vent 29 are isolated. When the piezoelectric module 26 is powered on, the piezoelectric unit 30 switches between the first mode and the second mode, and the first element 31 is deformed back and forth between the first mode and the second mode to provide airflow drive. The second element 32 opens the second air vent 29 in the first mode. When the second element 32 is in the second mode, the second air outlet 29 is closed. The second element 32 is deformed and switched between the first mode and the second mode to intermittently open the second air outlet 29, thereby realizing intermittent conduction between the first air outlet 28 and the second air outlet 29. When the piezoelectric module 26 is powered off, the piezoelectric unit 30 is in the third mode, and the first element 31 and the second element 32 are not deformed. The second element 32 closes the second air outlet 29 to isolate the first air outlet 28 from the second air outlet 29. This is conducive to realizing intermittent conduction between the first air outlet 28 and the second air outlet 29 of the piezoelectric module 26 and the isolation of the first air outlet 28 and the second air outlet 29.

[0044] Figure 4 and Figure 5 The arrow in the figure shows the direction of air flow. Figure 4 In the embodiment shown in , the first element 31 includes a first metal sheet 33 and a first piezoelectric ceramic 34. The second element 32 includes a second metal sheet 35 and a second piezoelectric ceramic 36. The piezoelectric unit 30 is in a first mode. When the voltage input to the first piezoelectric ceramic 34 is positive and the voltage input to the second piezoelectric ceramic 36 is negative, due to the inverse piezoelectric effect, the first element 31 is deformed downward, the second element 32 is deformed upward, and the second air outlet 29 is opened. Driven by the deformation of the first element 31, the high-pressure airflow passes through the opening formed by the second element 32 and is discharged from the second air outlet 29 to the air outlet 16. At the same time, in the process of the second air outlet 29 being discharged to the air outlet 16, the heating module 13 can be turned on to transfer heat to the shell 11, and perform efficient heat exchange with the high-pressure airflow through the shell 11, so that the high-pressure airflow is heated and ejected along the air outlet 16 to achieve a single jet. In Figure 4 In the process shown, the air entering through the air inlet 15 is supplied to the interior of the module body 27 through the first air outlet 28 to ensure the balance of the internal and external air pressures.

[0045] exist Figure 5 In the embodiment shown in , the piezoelectric unit 30 is in the second mode. The voltage input to the first piezoelectric ceramic 34 is negative, and the second piezoelectric ceramic 36 is not energized. Due to the inverse piezoelectric effect, the first element 31 is deformed upward, the second element 32 is deformed back, and the second air outlet 29 is closed. The air pressure between the first element 31 and the second element 32 drops, and the air entering from the air inlet 15 quickly flows to the space between the first element 31 and the second element 32 through the first air outlet 28, replenishing air for the next jet. And the second air outlet 29 is closed, and the module body 27 cannot replenish air from the air outlet 16, ensuring the unidirectionality of the airflow.

[0046] When the piezoelectric module 26 is powered on, the piezoelectric unit 30 switches between the first mode and the second mode. Among them, the voltage input to the first element 31 can be an alternating voltage, the voltage input to the second element 32 can be a pulse voltage, and the voltage frequency input to the first element 31 and the second element 32 is greater than 20000Hz, so that the air inlet 15 and the air outlet 16 are intermittently turned on at a high frequency of more than 20000Hz. It can also effectively ensure that the noise generated by the piezoelectric module 26 is outside the sound frequency band perceived by the human body, which can significantly reduce the noise during use and improve the user experience. And the piezoelectric units 30 in the piezoelectric module 26 can work simultaneously, thereby generating a high-pressure airflow, and the wind pressure of the airflow can exceed 1000Pa.

[0047] exist Figure 6In the illustrated embodiment, the piezoelectric unit 30 is in the third mode. The first piezoelectric ceramic 34 and the second piezoelectric ceramic 36 are not energized, and the first element 31 and the second element 32 are not deformed. The second element 32 closes the second air outlet 29 to isolate the first air outlet 28 from the second air outlet 29.

[0048] It should be understood that the present description is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present description is limited only by the appended claims.

Claims

1. A fan assembly, characterized in that: include: A housing, wherein an air flow channel is provided inside the housing, and the housing is provided with an air inlet and an air outlet communicated with the air flow channel; A fan, comprising a piezoelectric module; the fan is arranged in the air flow channel and between the air inlet and the air outlet; the piezoelectric module comprises an on state and a off state, in which the air inlet and the air outlet are intermittently connected at a set frequency; in the off state, the air inlet and the air outlet are isolated; and The heating module is arranged on the shell.

2. The fan assembly according to claim 1, characterized in that: The piezoelectric module comprises a plurality of piezoelectric modules arranged at intervals; in the open state, at least one of the piezoelectric modules is powered on; in the closed state, the plurality of piezoelectric modules are powered off; The piezoelectric module includes a module body; the module body is provided with a first air outlet connected to the air inlet and a second air outlet connected to the air outlet; when the piezoelectric module is powered on, the first air outlet and the second air outlet are intermittently connected; when the piezoelectric module is powered off, the first air outlet and the second air outlet are isolated.

3. The fan assembly according to claim 2, characterized in that: The piezoelectric module includes a plurality of piezoelectric units arranged in an array, and the piezoelectric units include a first mode, a second mode, and a third mode; in the first mode, the first air outlet and the second air outlet are connected; In the second mode and the third mode, the first air outlet and the second air outlet are isolated; When the piezoelectric module is powered on, the piezoelectric unit switches between the first mode and the second mode to make the first air outlet and the second air outlet intermittently conductive; when the piezoelectric module is powered off, the piezoelectric unit is in the third mode to isolate the first air outlet and the second air outlet.

4. The fan assembly according to claim 3, characterized in that: The piezoelectric unit includes a first element and a second element, wherein the first element and the second element are arranged inside the module body, and the second element is located at the second air outlet; When the piezoelectric module is powered on, the piezoelectric unit switches between the first mode and the second mode, so that the first element is deformed to provide airflow drive; in the first mode, the second element opens the second air outlet, and the first air outlet and the second air outlet are connected; in the second mode, the second element closes the second air outlet, and the first air outlet and the second air outlet are isolated; When the piezoelectric module is powered off, the piezoelectric unit is in a third mode, the first element and the second element are not deformed; the second element closes the second air outlet to isolate the first air outlet from the second air outlet.

5. The fan assembly according to claim 1, characterized in that: The shell comprises an outer shell and a bottom shell, wherein the outer shell is connected to the bottom shell; the outer shell and the bottom shell are enclosed to form the airflow channel; and the heating module is arranged on the bottom shell.

6. The fan assembly according to claim 5, characterized in that: The outer shell includes a top surface and a side surface connected between the top surface and the bottom shell; the air inlet is arranged on the top surface, and the air outlet is arranged on the side surface; the side surface includes a first surface and a second surface, the first surface extends obliquely from the top surface toward the air outlet, toward the direction close to the bottom shell, and is connected to the second surface.

7. The fan assembly according to claim 5, characterized in that: The inner wall of the bottom shell is protruded with a plurality of protrusions extending along a first direction, and the plurality of protrusions are arranged at intervals in a second direction; wherein the first direction is perpendicular to the second direction.

8. The fan assembly according to claim 1, characterized in that: The heating module is located between the air outlet side of the fan and the air outlet, and is used for heating the airflow discharged to the air outlet.

9. The fan assembly according to claim 1, characterized in that: The heating module comprises a glue layer and a heating layer, and the glue layer is arranged between the heating layer and the shell.

10. The fan assembly according to claim 9, characterized in that: The adhesive layer is a thermally conductive adhesive; and / or The heating layer is an electric heating element.

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