Electric fan

Abstract

The present invention provides an electric fan, comprising: a base; a machine head rotatably arranged on the base through a rotating shaft; a mounting disc arranged on the rotating shaft, and a plurality of light shielding sheets are protrudingly arranged on the mounting disc, the lengths L of the light shielding sheets along the circumferential direction of the mounting disc are different, and each light shielding sheet corresponds to a different angular position of the machine head in its rotation direction; a photoelectric detection sensor having a detection area, and during the process that each light shielding sheet rotates through the detection area, the photoelectric detection sensor is turned on and sends out a turn-on signal; a processor connected to the photoelectric detection sensor, and the processor obtains the angular position of the machine head according to the position of the light shielding sheet. The present invention solves the problems that the structure of the existing electric fan with a 360-degree rotatable machine head is complex, usually a slip ring is used to supply power to the machine head to control its rotation angle, and at the same time a specific angle detection sensor is used to monitor the position of the machine head in real time, resulting in high overall manufacturing cost and poor economy.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and more particularly, to a structural improvement of an electric fan. Background Art

[0002] The head rotation and air-sweeping angle of common electric fans on the market are fixed. This is achieved by limiting the head on its rotation path, so as to realize the left and right rotation and air-sweeping of the head within a predetermined angle range.

[0003] In order to improve the practicality of the electric fan and make it have a wider air-sweeping surface, some electric fans in the prior art can achieve 360-degree rotation and air-sweeping. The structures of such electric fans are complex. Usually, a slip ring is used to supply power to the head to control its rotation angle, and a specific angle detection sensor is used to monitor the position of the head in real time. This greatly increases the overall manufacturing cost of such electric fans and is not conducive to improving economy. Summary of the Invention

[0004] The main object of the present invention is to provide an electric fan to solve the problems in the prior art that the structure of an electric fan with a 360-degree rotating head is complex, usually a slip ring is used to supply power to the head to control its rotation angle, and a specific angle detection sensor is used to monitor the position of the head in real time, resulting in high overall manufacturing cost and poor economy.

[0005] To achieve the above object, according to one aspect of the present invention, there is provided an electric fan, including: a base; a head rotatably disposed on the base through a rotating shaft; a mounting disk disposed on the rotating shaft along the radial plane of the rotating shaft, a plurality of light-blocking sheets protruding from the mounting disk and spaced circumferentially around the mounting disk, a light-transmitting gap being formed between adjacent two light-blocking sheets, the lengths L of the respective light-blocking sheets in the circumferential direction of the mounting disk being different, and the respective light-blocking sheets corresponding to different angular positions of the head in its rotation direction; a photoelectric detection sensor disposed opposite to the mounting disk along the axial direction of the mounting disk, the photoelectric detection sensor having a detection area, the annular path formed by the plurality of light-blocking sheets passing through the detection area, when each light-transmitting gap passes through the detection area, the photoelectric detection sensor is turned on and sends out a turn-on signal; a processor connected to the photoelectric detection sensor for receiving and processing the turn-on signal, the processor calibrating the light-blocking sheet passing through the detection area according to the duration of two adjacent turn-on signals received, and obtaining the angular position of the head according to the position of the light-blocking sheet.

[0006] Further, along the circumferential direction of the mounting disk, the lengths L of the plurality of light-blocking sheets increase or decrease in sequence.

[0007] Further, along the circumferential direction of the mounting disk, the lengths L of the plurality of light-blocking sheets increase or decrease gradually in an arithmetic progression.

[0008] Further, the common difference of the arithmetic progression is greater than or equal to 1 mm and less than or equal to 10 mm.

[0009] Further, the electric fan further includes a motor, the motor is drivingly connected to the rotating shaft, and among the plurality of light-shielding sheets, the central angle A corresponding to the light-shielding sheet with the smallest length is greater than or equal to the step angle of the motor.

[0010] Further, the step angle of the motor is greater than or equal to 0.75° and less than or equal to 10°.

[0011] Further, the photoelectric detection sensor includes a light-emitting end and a light-receiving end. The light-emitting end and the light-receiving end are respectively located on both sides of the detection area. When the light-receiving end receives the light emitted by the light-emitting end, the photoelectric detection sensor generates a conduction signal.

[0012] Further, an emission slit and a reception slit are formed on the photoelectric detection sensor and are oppositely arranged. The light-emitting end emits light to the light-receiving end through the emission slit, and the light-receiving end receives the light through the reception slit.

[0013] Further, the widths of the emission slit and the reception slit are smaller than the length of the light-shielding sheet with the smallest length among the plurality of light-shielding sheets.

[0014] Further, the number of light-shielding sheets is greater than or equal to 2 and less than or equal to 20.

[0015] Further, the photoelectric detection sensor is an infrared opposed photoelectric sensor.

[0016] According to another aspect of the present invention, there is provided an electric fan, including: a base; a machine head, the machine head is rotatably arranged on the base through a rotating shaft; a mounting disc, the mounting disc is arranged on the rotating shaft along the radial plane of the rotating shaft, a plurality of reflecting sheets protruding and arranged at intervals along the circumferential direction of the mounting disc are provided on the mounting disc, an interval gap is formed between adjacent two reflecting sheets, the lengths L of the reflecting sheets along the circumferential direction of the mounting disc are different, and each reflecting sheet corresponds to a different angular position of the machine head in its rotating direction; a photoelectric detection sensor, the photoelectric detection sensor has a light-emitting end and a light-receiving end oppositely arranged with respect to the reflecting sheet in the radial direction of the mounting disc, the light emitted by the light-emitting end is reflected by the reflecting sheet and then received by the light-receiving end, the photoelectric detection sensor is turned on, and a conduction signal is sent outwards; a processor, the processor is connected to the photoelectric detection sensor and is used for receiving and processing the conduction signal. The processor calibrates the reflecting sheet passing through the detection area according to the time durations of two adjacent conduction signals received, and obtains the angular position of the machine head according to the position of the reflecting sheet.

[0017] Further, the photoelectric detection sensor is a reflective photoelectric sensor.

[0018] Applying the technical solution of the present invention, by improving the structure of the electric fan, the detection function of the rotation position of the machine head is realized by means of the photoelectric detection sensor and the processor cooperating with the mounting disc arranged on the rotating shaft, so as to achieve the effect of accurately and real-time detecting the position of the machine head. Furthermore, it is beneficial to control the rotation angle of the machine head. On the premise of avoiding a substantial increase in the overall cost of the electric fan, the performance of the electric fan is improved, and the practicability of the electric fan is enhanced.

[0019] Specifically, by protruding and arranging a plurality of light-blocking sheets on the mounting disc at circumferential intervals around the mounting disc, in this way, a light-transmitting gap is formed between adjacent two light-blocking sheets, and the lengths L of the respective light-blocking sheets along the circumference of the mounting disc are different, and the respective light-blocking sheets correspond to different angular positions of the machine head in its rotation direction; then, by using the conduction signal containing the time length of each light-blocking sheet that rotates through its detection area emitted by the photoelectric detection sensor, the processor calibrates the light-blocking sheet passing through the detection area according to the time lengths of two adjacent conduction signals received, and obtains the angular position of the machine head according to the position of the light-blocking sheet. In this way, the photoelectric detection sensor and the processor cooperate with the mounting disc of a specific structure, which can not only ensure accurate detection of the position of the machine head of the electric fan, be beneficial to controlling the rotation angle of the machine head, and enhance the practicability of the electric fan; but also will not substantially increase the structural complexity of the electric fan, avoid using expensive and structurally complex angle detection sensors, be beneficial to controlling the overall cost of the electric fan, and ensure the economy of the electric fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0021] Figure 1 A top view schematic diagram of the mounting disc according to an optional embodiment of the present invention is shown;

[0022] Figure 2 A front view schematic diagram of the positional relationship between the mounting disc and the photoelectric detection sensor of the electric fan according to Embodiment 1 of the present invention is shown;

[0023] Figure 3 Shows Figure 2 A top view schematic diagram of the positional relationship between the light-blocking sheet of the mounting disc and the photoelectric detection sensor of the electric fan in

[0024] Figure 4 A front view schematic diagram of the positional relationship between the mounting disc and the photoelectric detection sensor of the electric fan according to Embodiment 2 of the present invention is shown.

[0025] Among them, the above-mentioned accompanying drawings include the following reference numerals:

[0026] 10. Mounting disk; 11. Light shielding sheet; 12. Light transmission gap; 13. Reflective sheet; 20. Photoelectric detection sensor; 100. Detection area; 21. Light emission end; 22. Light receiving end; 23. Emission slit; 24. Reception slit. Detailed implementation manners

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The description of at least one exemplary embodiment below is actually only illustrative and in no way serves as a limitation to the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0028] In order to solve the problems in the prior art that the structure of an electric fan with a 360-degree rotatable head is complex, a conductive ring is usually used to supply power to the head to control its rotation angle, and a specific angle detection sensor is used to monitor the position of the head in real time, resulting in high overall manufacturing cost and poor economy, the present invention provides an electric fan.

[0029] Embodiment 1

[0030] As Figures 1 to 3 shown, the electric fan includes a base, a head, a mounting disk 10, a photoelectric detection sensor 20, and a processor. The head is rotatably arranged on the base through a rotating shaft. The mounting disk 10 is arranged on the rotating shaft along the radial plane of the rotating shaft. A plurality of light shielding sheets 11 are convexly arranged on the mounting disk 10 at intervals along the circumferential direction of the mounting disk 10. A light transmission gap 12 is formed between two adjacent light shielding sheets 11. The lengths L of the light shielding sheets 11 along the circumferential direction of the mounting disk 10 are different, and each light shielding sheet 11 corresponds to a different angular position of the head in its rotation direction. The photoelectric detection sensor 20 is arranged opposite to the mounting disk 10 along the axial direction of the mounting disk 10. The photoelectric detection sensor 20 has a detection area 100. The circular path where the plurality of light shielding sheets 11 are arranged passes through the detection area 100. When each light transmission gap 12 passes through the detection area 100, the photoelectric detection sensor 20 is turned on and sends out a turn-on signal; the processor is connected to the photoelectric detection sensor 20 and is used to receive and process the turn-on signal. The processor calibrates the light shielding sheet 11 passing through the detection area 100 according to the duration of two adjacent turn-on signals received, and obtains the angular position of the head according to the position of the light shielding sheet 11.

[0031] By improving the structure of the electric fan, the detection function of the rotation position of the machine head is realized by cooperating the photoelectric detection sensor 20 and the processor with the mounting disk 10 arranged on the rotating shaft, so as to achieve the effect of accurately and real-time detecting the position of the machine head, which is beneficial to controlling the rotation angle of the machine head. On the premise of avoiding a substantial increase in the overall cost of the electric fan, the performance of the electric fan is improved and the practicability of the electric fan is enhanced.

[0032] Specifically, a plurality of light-shielding plates 11 are protrudingly arranged on the mounting disk 10 at circumferential intervals around the mounting disk 10. In this way, a light-transmitting gap 12 is formed between two adjacent light-shielding plates 11, and the lengths L of the light-shielding plates 11 along the circumference of the mounting disk 10 are different, and each light-shielding plate 11 corresponds to different angular positions of the machine head in its rotation direction; then, the conduction signals containing the time lengths of the light-shielding plates 11 rotating through its detection area 100 emitted by the photoelectric detection sensor 20 are utilized, and the processor calibrates the light-shielding plates 11 passing through the detection area 100 according to the time lengths of two adjacent conduction signals received, and obtains the angular position of the machine head according to the position of the light-shielding plates 11. In this way, the photoelectric detection sensor 20 and the processor cooperate with the mounting disk 10 of a specific structure, which can not only ensure accurate detection of the position of the machine head of the electric fan, is beneficial to controlling the rotation angle of the machine head, and improves the practicability of the electric fan; but also will not greatly increase the structural complexity of the electric fan, avoid using expensive and complex angle detection sensors, is beneficial to controlling the overall cost of the electric fan, and ensures the economy of the electric fan.

[0033] As Figure 1 shown, in order to make the conduction interval time length of the photoelectric detection sensor 20 regular and reduce the detection difficulty of the detection part, along the circumference of the mounting disk 10, the lengths L of the plurality of light-shielding plates 11 increase or decrease in sequence.

[0034] Preferably, along the circumference of the mounting disk 10, the lengths L of the plurality of light-shielding plates 11 increase or decrease gradually according to an arithmetic progression. In this way, it is convenient to set the plurality of light-shielding plates 11 regularly, so as to ensure the aesthetic appearance of the mounting disk 10, and is beneficial to improving the detection accuracy of the photoelectric detection sensor 20 for each light-shielding plate 11.

[0035] Considering that in order to make the mounting disk 10 adapt to be mounted on the rotating shafts with different diameters of different models of electric fans, optionally, the common difference of the arithmetic progression is greater than or equal to 1 mm and less than or equal to 10 mm.

[0036] It should be noted that the electric fan further includes a motor, the motor is drivingly connected to the rotating shaft. Among the plurality of light-shielding plates 11, the central angle A corresponding to the light-shielding plate 11 with the smallest length is greater than or equal to the step angle of the motor. In this way, it is beneficial to improve the accuracy of detecting different angular positions of the machine head in its rotation direction.

[0037] Optionally, the step angle of the motor is greater than or equal to 0.75° and less than or equal to 10°.

[0038] As Figure 2 and Figure 3 shown, the photoelectric detection sensor 20 includes a light emitting end 21 and a light receiving end 22. The light emitting end 21 and the light receiving end 22 are respectively located on both sides of the detection area 100. When the light receiving end 22 receives the light emitted by the light emitting end 21, the photoelectric detection sensor 20 generates a conduction signal.

[0039] In order to ensure that the light emitted by the photoelectric detection sensor 20 has excellent light condensing characteristics, and thus ensure the stability of the conduction signal generated by the photoelectric detection sensor 20, opposite emission slits 23 and receiving slits 24 are formed on the photoelectric detection sensor 20. The light emitting end 21 emits light to the light receiving end 22 through the emission slits 23, and the light receiving end 22 receives light through the receiving slits 24.

[0040] It should be noted that the widths of the emission slits 23 and the receiving slits 24 are smaller than the length of the smallest one of the plurality of light shielding sheets 11. In this way, it can be ensured that when each light shielding sheet 11 passes through the detection area 100, it can effectively block the light emitted by the light emitting end 21, so that the light receiving end 22 is in a non-conducting state. By detecting the duration during which the light receiving end 22 continuously does not receive light, that is, the duration in the non-conducting state, during the process that each light shielding sheet 11 rotates uniformly through the detection area 100, the angular position of the machine head can be reliably obtained corresponding to the positions of the respective light shielding sheets 11.

[0041] Optionally, the number of the light shielding sheets 11 is greater than or equal to 2 and less than or equal to 20.

[0042] In this embodiment, the photoelectric detection sensor 20 is an infrared opposed photoelectric sensor.

[0043] Embodiment 2

[0044] As Figure 4As shown, in this embodiment, the electric fan includes a base, a head, a mounting disc 10, a photoelectric detection sensor 20, and a processor. The head is rotatably arranged on the base through a rotating shaft. The mounting disc 10 is arranged on the rotating shaft along the radial plane of the rotating shaft. A plurality of reflecting sheets 13 are protrudingly arranged on the mounting disc 10 at circumferential intervals around the mounting disc 10. An interval gap is formed between two adjacent reflecting sheets 13. The lengths L of the reflecting sheets 13 along the circumference of the mounting disc 10 are different, and each reflecting sheet 13 corresponds to different angular positions of the head in its rotating direction. The photoelectric detection sensor 20 has a light emitting end 21 and a light receiving end 22 that are oppositely arranged with respect to the reflecting sheet 13 in the radial direction of the mounting disc 10. The light emitted by the light emitting end 21 is reflected by the reflecting sheet 13 and then received by the light receiving end 22. The photoelectric detection sensor 20 is turned on and sends out a conduction signal outward. The processor is connected to the photoelectric detection sensor 20 and is used to receive and process the conduction signal. The processor calibrates the reflecting sheet 13 passing through the detection area 100 according to the durations of two adjacent conduction signals received, and obtains the angular position of the head according to the position of the reflecting sheet 13.

[0045] The principle of detecting the angular position of the head of the electric fan in this embodiment is similar to that of the first embodiment. The difference is that the photoelectric detection sensor 20 is a reflective photoelectric sensor. What is protrudingly arranged on the mounting disc 10 is the reflecting sheet 13. The reflecting sheet 13 is used to reflect the light emitted by the light emitting end 21. The light receiving end 22 and the light emitting end 21 are located on the same side of the reflecting sheet 13 to ensure that the light receiving end 22 is turned on after receiving the light.

[0046] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0047] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, further discussion thereof in subsequent drawings is not necessary.

[0048] For the sake of convenience of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. may be used here to describe the spatial positional relationship of a device or feature shown in the figure with other devices or features. It should be understood that the spatial relative terms are intended to cover different orientations in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is inverted, the device described as "above" or "over" other devices or structures will then be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0049] It should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used here, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0050] It should be noted that the terms "first", "second", etc. in the specification, claims, and above-mentioned drawings of the present application are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present application described here can be implemented in an order different from those illustrated or described here.

[0051] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An electric fan, characterized in that, Comprising: A base; A machine head, which is rotatably arranged on the base through a rotating shaft; A mounting disc (10), the mounting disc (10) is arranged on the rotating shaft along the radial plane of the rotating shaft, and a plurality of light-shielding sheets (11) are convexly arranged on the mounting disc (10) at circumferential intervals around the mounting disc (10). A light-transmitting gap (12) is formed between two adjacent light-shielding sheets (11). The lengths L of the light-shielding sheets (11) in the circumferential direction of the mounting disc (10) are different, and each light-shielding sheet (11) corresponds to a different angular position of the machine head in its rotation direction; An optoelectronic detection sensor (20), the optoelectronic detection sensor (20) is arranged opposite to the mounting disc (10) along the axial direction of the mounting disc (10). The optoelectronic detection sensor (20) has a detection area (100). The annular path where the plurality of light-shielding sheets (11) are arranged passes through the detection area (100). During the process that each light-transmitting gap (12) passes through the detection area (100), the optoelectronic detection sensor (20) is turned on and sends out a turn-on signal; A processor, the processor is connected to the optoelectronic detection sensor (20) for receiving and processing the turn-on signal. The processor calibrates the light-shielding sheet (11) passing through the detection area (100) according to the duration of two adjacent turn-on signals received, and obtains the angular position of the machine head according to the position of the light-shielding sheet (11).

2. The electric fan according to claim 1, wherein, Along the circumferential direction of the mounting disc (10), the lengths L of the plurality of light-shielding sheets (11) increase or decrease sequentially.

3. The electric fan according to claim 2, wherein, Along the circumferential direction of the mounting disc (10), the lengths L of the plurality of light-shielding sheets (11) increase or decrease gradually according to an arithmetic progression.

4. The electric fan according to claim 3, characterized in that, The common difference of the arithmetic progression is greater than or equal to 1 mm and less than or equal to 10 mm.

5. The electric fan according to claim 1, wherein The electric fan further includes a motor, the motor is drivingly connected to the rotating shaft. Among the plurality of light-shielding sheets (11), the central angle A corresponding to the light-shielding sheet (11) with the smallest length is greater than or equal to the step angle of the motor.

6. The electric fan according to claim 5, characterized in that, The step angle of the motor is greater than or equal to 0.75° and less than or equal to 10°.

7. The electric fan according to claim 1, characterized in that, The optoelectronic detection sensor (20) includes a light-emitting end (21) and a light-receiving end (22). The light-emitting end (21) and the light-receiving end (22) are respectively located on both sides of the detection area (100). When the light-receiving end (22) receives the light emitted by the light-emitting end (21), the optoelectronic detection sensor (20) generates the turn-on signal.

8. The electric fan according to claim 7, characterized in that, An emission slit (23) and a reception slit (24) are formed on the optoelectronic detection sensor (20) in a relatively arranged manner. The light-emitting end (21) emits light to the light-receiving end (22) through the emission slit (23), and the light-receiving end (22) receives the light through the reception slit (24).

9. The electric fan according to claim 8, wherein, The widths of the emission slit (23) and the reception slit (24) are smaller than the length of the light-shielding sheet (11) with the smallest length among the plurality of light-shielding sheets (11).

10. The electric fan according to claim 1, characterized in that, The number of the light shielding sheets (11) is greater than or equal to 2 and less than or equal to 20.

11. The electric fan according to claim 1, characterized in that, The photoelectric detection sensor (20) is an infrared opposed photoelectric sensor.

12. An electric fan, characterized in that, Comprising: A base; A machine head, the machine head is rotatably arranged on the base through a rotating shaft; A mounting disc (10), the mounting disc (10) is arranged on the rotating shaft along the radial plane of the rotating shaft, a plurality of reflecting sheets (13) are convexly arranged on the mounting disc (10) at intervals along the circumferential direction of the mounting disc (10), an interval gap is formed between two adjacent reflecting sheets (13), the lengths L of the reflecting sheets (13) along the circumferential direction of the mounting disc (10) are different, and the reflecting sheets (13) correspond to different angular positions of the machine head in its rotation direction; A photoelectric detection sensor (20), the photoelectric detection sensor (20) has a light emitting end (21) and a light receiving end (22) which are oppositely arranged with respect to the reflecting sheet (13) in the radial direction of the mounting disc (10), the light emitted from the light emitting end (21) is reflected by the reflecting sheet (13) and then received by the light receiving end (22), the photoelectric detection sensor (20) is turned on, and a turn-on signal is sent outwards; A processor, the processor is connected with the photoelectric detection sensor (20) and is used for receiving and processing the turn-on signal, the processor calibrates the reflecting sheet (13) passing through the detection area (100) according to the duration of two adjacent turn-on signals received, and obtains the angular position of the machine head according to the position of the reflecting sheet (13).

13. The electric fan according to claim 12, wherein, The photoelectric detection sensor (20) is a reflective photoelectric sensor.

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