Range hood with magnetic film structure and control method thereof

Abstract

The present invention proposes a range hood with a magnetic film structure and a control method thereof. The range hood comprises a range hood body, a fan, and a maintenance panel. The fan is mounted within the range hood body, and the maintenance panel is mounted on the range hood body. A magnetic film structure is provided on the side of the maintenance panel facing the fan. The magnetic film structure comprises a central protrusion and annular protrusions surrounding the central protrusion. Electromagnetic induction coils are provided within the central protrusion and the annular protrusions. The electromagnetic induction coil drives the magnetic film structure to vibrate, forming a standing wave with the vibration generated by the fan, effectively reducing noise from the range hood.

Description

Technical Field

[0001] The present invention relates to the technical field of range hoods, and in particular to a range hood with a magnetic film structure and a control method thereof. Background Art

[0002] In recent years, the domestic range hood market has been focused on high airflow and powerful suction. As airflow increases, the noise generated by range hoods has also grown. Turning on the range hood while cooking obscures the ability to hear conversations, phone calls, doorbells, and children. This high noise level can even cause irritability, headaches, and heart palpitations in housewives and kitchen workers. Long-term use can have serious consequences for both physical and mental health. Therefore, noise has become a pressing technical issue with existing range hoods that needs to be addressed. Summary of the Invention

[0003] The present invention aims to solve one of the problems existing in the existing related technologies to a certain extent. To this end, one purpose of the present invention is to provide a range hood with a magnetic film structure to effectively reduce the noise generated by the range hood.

[0004] The above purpose is achieved through the following technical solutions:

[0005] A range hood with a magnetic film structure includes a range hood body, a fan and a maintenance plate. The fan is installed in the range hood body, and the maintenance plate is installed on the range hood body. A magnetic film structure is provided on the side of the maintenance plate facing the fan. The magnetic film structure includes a central protrusion and annular protrusions arranged around the central protrusion. Electromagnetic induction coils are provided in the central protrusion and the annular protrusions.

[0006] As a further improvement of the present invention, the protrusion height of the annular protrusion is lower than the protrusion height of the central protrusion.

[0007] As a further improvement of the present invention, the annular protrusion includes a first hollow annular protrusion, a second hollow annular protrusion and a third hollow annular protrusion which are independent of each other, the first hollow annular protrusion is arranged around the outside of the central protrusion, the second hollow annular protrusion is arranged around the outside of the first hollow annular protrusion, and the third hollow annular protrusion is arranged around the outside of the second hollow annular protrusion.

[0008] As a further improvement of the present invention, the protrusion height of the first hollow annular protrusion is higher than the protrusion height of the second hollow annular protrusion, and the protrusion height of the second hollow annular protrusion is higher than the protrusion height of the third hollow annular protrusion.

[0009] As a further improvement of the present invention, the central protrusion is a conical structure, and the electromagnetic induction coil in the central protrusion forms a conical coil adapted to the shape of the central protrusion along the curvature of the inner wall of the central protrusion and below the inner wall of the central protrusion.

[0010] As a further improvement of the present invention, the electromagnetic induction coil in the annular protrusion forms an annular coil adapted to the shape of the annular protrusion along the curvature of the inner wall of the annular protrusion and below the inner wall of the annular protrusion.

[0011] As a further improvement of the present invention, the protruding portion of the central protrusion faces the air inlet end of the fan.

[0012] As a further improvement of the present invention, a driver is further included, and the driver is used to change the current in the electromagnetic induction coil.

[0013] As a further improvement of the present invention, it further includes a controller and a fan speed sensor, and the controller is electrically connected to the fan speed sensor and the driver respectively.

[0014] Another object of the present invention is to provide a control method for a range hood having a magnetic film structure, so as to effectively reduce the noise generated by the range hood.

[0015] The above purpose is achieved through the following technical solutions:

[0016] A control method for a range hood having a magnetic film structure is applied to the range hood having a magnetic film structure described above, comprising the following steps:

[0017] Detect fan speed;

[0018] Obtain the ideal vibration frequency of the magnetic film structure according to the fan speed;

[0019] The magnitude of the current passed into the electromagnetic induction coil is adjusted according to the obtained ideal vibration frequency of the magnetic film structure.

[0020] As a further improvement of the present invention, the method for obtaining the ideal vibration frequency of the magnetic film structure according to the fan speed is: f=v*a / 60, where f is the vibration frequency of the magnetic film structure, v is the fan speed, and a is the number of blades in the fan.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects:

[0022] 1. The present invention proposes a range hood with a magnetic film structure. The electromagnetic induction coil drives the magnetic film structure to vibrate, which forms a standing wave noise reduction with the vibration generated by the fan, effectively reducing the noise of the range hood.

[0023] 2. The present invention proposes a control method for a range hood with a magnetic film structure. By adjusting the current passed into the electromagnetic induction coil, the magnetic film generates sound vibrations with the same frequency as the ideal vibration frequency, that is, the vibration frequency of the fan, forming a standing wave noise reduction with the vibration generated by the fan, thereby effectively reducing the noise generated by the range hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is an exploded schematic diagram of the range hood in the embodiment;

[0025] Figure 2 is a cross-sectional view of the range hood in the embodiment;

[0026] Figure 3 Schematic diagram of the structure of the magnetic film in the embodiment;

[0027] Figure 4 This is a cross-sectional view of the magnetic film structure in the embodiment with the electromagnetic induction coil omitted;

[0028] Figure 5 is a cross-sectional view of a magnetic film structure in an embodiment;

[0029] Figure 6 Flowchart of the control method in the embodiment. DETAILED DESCRIPTION

[0030] The following examples illustrate the present invention, but the present invention is not limited to these examples. Modifications to the specific embodiments of the present invention or equivalent replacements of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed in the present invention.

[0031] Example 1:

[0032] See attached Figure 1-5The present invention illustrates a range hood with a magnetic film structure. The range hood comprises a hood body 1, a fan 2, and a maintenance panel 3. The fan 2 is mounted within the hood body 1, and the maintenance panel 3 is mounted on the hood body 1. A magnetic film structure 4 is provided on the side of the maintenance panel 3 facing the fan 2. The magnetic film structure 4 comprises a central protrusion 41 and annular protrusions 42 surrounding the central protrusion 41. An electromagnetic induction coil 5 is located within the central protrusion 41 and the annular protrusions 42. The present invention provides a range hood with a magnetic film structure. The fan 2 generates vibration and noise due to rotation. Current is passed through the electromagnetic induction coil 5, generating a magnetic field around the electromagnetic induction coil 5. This magnetic field drives the magnetic film structure 4 to vibrate. The vibrations generated by the magnetic film structure 4 and the vibrations generated by the fan 2 form standing waves, which reduce noise. Furthermore, the magnitude of the magnetic field generated by the electromagnetic induction coil 5 can be varied by changing the current passed through the electromagnetic induction coil 5, driving the magnetic film structure 4 to produce sounds of varying frequencies. This effectively reduces noise generated by the range hood.

[0033] The height of the annular protrusion 42 is lower than that of the central protrusion 41. The protrusion of the central protrusion 41 faces the air inlet of the fan 2. The air inlet of the fan 2 is the largest source of noise in the range hood. The high height of the central protrusion 41 increases the surface area of the magnetic film forming it, generating a high vibration frequency. This, combined with the vibration generated at the air inlet of the fan 2, creates a standing wave noise reduction effect, focusing on noise reduction at the air inlet of the fan 2.

[0034] The annular protrusion 42 may include a plurality of independent hollow annular protrusions. The hollow annular protrusions are arranged around the outside of the central protrusion 41, and the protrusion height of the hollow annular protrusions gradually decreases from close to the central protrusion 41 to away from the central protrusion 41. In this embodiment, the annular protrusion 42 includes a first hollow annular protrusion 421, a second hollow annular protrusion 422 and a third hollow annular protrusion 423 that are independent of each other. The first hollow annular protrusion 421 is arranged around the outside of the central protrusion 41, the second hollow annular protrusion 422 is arranged around the outside of the first hollow annular protrusion 421, and the third hollow annular protrusion 423 is arranged around the outside of the second hollow annular protrusion 422. The protrusion height of the first hollow annular protrusion 421 is higher than the protrusion height of the second hollow annular protrusion 422, and the protrusion height of the second hollow annular protrusion 422 is higher than the protrusion height of the third hollow annular protrusion 423. That is, the surface area of the magnetic film forming the second hollow annular protrusion 422 is smaller than that of the magnetic film forming the first hollow annular protrusion 421 , and the surface area of the magnetic film forming the third hollow annular protrusion 423 is smaller than that of the magnetic film forming the second hollow annular protrusion 422 .

[0035] The noise generated at the air inlet of fan 2 is the greatest. With the air inlet of fan 2 as the center point, the noise intensity gradually decreases as the distance from the air inlet of fan 2 increases. The magnetic film structure 4 corresponds to this, with a high central protrusion 41 and a large film surface area, generating a high vibration frequency. Aiming at the air inlet of fan 2, the hollow annular protrusions 42 surrounding the central protrusion 41 gradually decrease in height, from the first hollow annular protrusion 421 to the third hollow annular protrusion 423, and the film surface area also gradually decreases, generating a lower and lower vibration frequency. This is consistent with the noise distribution pattern generated by the range hood, effectively reducing the noise of the range hood and preventing other noise generated by the greater vibration of the magnetic film.

[0036] The central protrusion 41 may have a truncated cone, a conical structure, or other structures. In this embodiment, the central protrusion 41 has a conical structure. The electromagnetic induction coil 5 within the central protrusion 41 is arranged along the curvature of the inner wall of the central protrusion 41 and below the inner wall of the central protrusion 41 to form a conical coil 51 that conforms to the shape of the central protrusion 41. The electromagnetic induction coil 5 is arranged along the curvature of the inner wall of the central protrusion 41, forming a cone with the same shape as the central protrusion 41, which facilitates driving the vibration of the magnetic film forming the central protrusion 41.

[0037] The electromagnetic induction coil 5 within the annular protrusion 42 is arranged along the curvature of the inner wall of the annular protrusion 42 and below the inner wall of the annular protrusion 42 to form an annular coil 52 that is adapted to the shape of the annular protrusion 42. The electromagnetic induction coil 5 is arranged along the curvature of the inner wall of the annular protrusion 42 to form an annular shape that is the same as the annular protrusion 42, which is conducive to driving the vibration of the magnetic film forming the annular protrusion 42.

[0038] The system further comprises a driver for changing the current in the electromagnetic induction coil 5. The system further comprises a controller and a speed sensor of the fan 2, wherein the controller is electrically connected to the speed sensor of the fan 2 and the driver respectively.

[0039] When the range hood is started, the fan 2 is turned on in conjunction with it. The fan 2 speed sensor detects the speed of the fan 2. The driver supplies current to the electromagnetic induction coil 5. The electromagnetic induction coil 5 with current generates a magnetic field around it, driving the magnetic film structure 4 to vibrate and generate sound. The vibration generated by the magnetic film and the vibration generated by the fan 2 form standing waves to reduce noise.

[0040] The driver changes the size of the magnetic field generated by the electromagnetic induction coil 5 by passing currents of different sizes into the electromagnetic induction coil 5, thereby changing the sound vibration frequency of the magnetic film structure 4. The magnetic film generates the same sound vibration frequency as the fan 2, so that the vibration generated by the magnetic film structure 4 and the vibration generated by the fan 2 form a standing wave to reduce noise.

[0041] The fan 2 speed sensor detects the fan 2 speed and calculates the ideal vibration frequency of the magnetic thin film structure 4 using the formula f = v * a / 60, where f is the vibration frequency of the magnetic thin film structure 4, v is the fan 2 speed, and a is the number of blades in the fan 2. The ideal vibration frequency is determined by ensuring that the vibration of the magnetic thin film is comparable to the acoustic vibrations generated by the fan 2, thereby creating a standing wave for noise reduction. Based on the ideal vibration frequency, the current flowing into the electromagnetic induction coil 5 is adjusted so that the electromagnetic induction coil 5 drives the magnetic thin film structure 4 to produce the ideal vibration frequency.

[0042] In other embodiments, a vibration frequency detector can be provided to detect the vibration frequency generated by the fan 2. The vibration frequency detector is electrically connected to the controller. The user adjusts the rotation speed of the range hood fan 2 as needed, and the vibration frequency detector can detect the vibration frequency generated by the rotation of the fan 2. The controller can control the driver to supply an appropriate current to the electromagnetic induction coil 5 so that the magnetic film structure 4 generates the same vibration frequency as the fan 2.

[0043] Example 2:

[0044] See attached Figure 6 A control method for a range hood having a magnetic film structure according to the present invention is shown, comprising the following steps:

[0045] Step S1, detecting the fan speed;

[0046] Step S2, obtaining the ideal vibration frequency of the magnetic film structure according to the fan speed;

[0047] Step S3: adjusting the magnitude of the current flowing into the electromagnetic induction line according to the obtained ideal vibration frequency of the magnetic film structure.

[0048] In step S2, the method for obtaining the ideal vibration frequency of the magnetic film structure according to the fan speed is: f=v*a / 60, where f is the vibration frequency of the magnetic film, v is the fan speed, and a is the number of blades in the fan.

[0049] The rotation of fan 2 generates acoustic vibrations, which are generated by the magnetic film structure at the same frequency as the fan, creating standing wave noise reduction, thereby reducing the noise of the range hood. The present invention proposes a control method for a range hood with a magnetic film structure. By detecting the fan speed, the ideal vibration frequency of the magnetic film structure is determined based on the fan speed. The current flowing into the electromagnetic induction coil is adjusted to cause the magnetic film to generate a vibration frequency of the same magnitude as the ideal vibration frequency, thus creating standing wave noise reduction and effectively reducing the noise generated by the range hood. The ideal vibration frequency here refers to the ideal vibration frequency generated by the magnetic film, which is equivalent in magnitude to the acoustic vibration generated by the fan, thus creating standing wave noise reduction.

[0050] The above preferred embodiments should be regarded as examples of the implementation methods of the present application scheme. Any technical deductions, replacements, improvements, etc. that are identical or similar to the present application scheme or made based on it should be regarded as within the scope of protection of this patent.

Claims

1. A range hood with a magnetic film structure, characterized in that: The invention comprises a range hood body (1), a fan (2) and a maintenance plate (3), wherein the fan (2) is installed in the range hood body (1), the maintenance plate (3) is installed on the range hood body (1), and a magnetic film structure (4) is provided on the side of the maintenance plate (3) facing the fan (2), wherein the magnetic film structure (4) comprises a central protrusion (41) and an annular protrusion (42) arranged around the central protrusion (41), an electromagnetic induction coil (5) is provided in the central protrusion (41) and the annular protrusion (42), and the protrusion height of the annular protrusion (42) is lower than that of the central protrusion (41). The protrusion height is such that the central protrusion (41) is a conical structure, the electromagnetic induction coil (5) in the central protrusion (41) forms a conical coil (51) adapted to the shape of the central protrusion (41) along the curvature of the inner wall of the central protrusion (41) and below the inner wall of the central protrusion (41), the protrusion of the central protrusion (41) faces the air inlet end of the fan (2), and the electromagnetic induction coil (5) in the annular protrusion (42) forms an annular coil (52) adapted to the shape of the annular protrusion (42) along the curvature of the inner wall of the annular protrusion (42) and below the inner wall of the annular protrusion (42).

2. The range hood with a magnetic film structure according to claim 1, characterized in that: The annular protrusion (42) includes a first hollow annular protrusion (421), a second hollow annular protrusion (422) and a third hollow annular protrusion (423) which are independent of each other. The first hollow annular protrusion (421) is arranged around the outside of the central protrusion (41), the second hollow annular protrusion (422) is arranged around the outside of the first hollow annular protrusion (421), and the third hollow annular protrusion (423) is arranged around the outside of the second hollow annular protrusion (422).

3. The range hood with a magnetic film structure according to claim 2, characterized in that: The protrusion height of the first hollow annular protrusion (421) is higher than the protrusion height of the second hollow annular protrusion (422), and the protrusion height of the second hollow annular protrusion (422) is higher than the protrusion height of the third hollow annular protrusion (423).

4. The range hood with a magnetic film structure according to claim 1, characterized in that: It also includes a driver, which is used to change the current in the electromagnetic induction coil (5).

5. The range hood with a magnetic film structure according to claim 4, characterized in that: It also includes a controller and a fan (2) speed sensor, wherein the controller is electrically connected to the fan (2) speed sensor and the driver respectively.

6. A control method for a range hood having a magnetic film structure, characterized in that: The method is applied to a range hood having a magnetic film structure as claimed in any one of claims 1 to 5, comprising the following steps: Detect fan speed; Obtain the vibration frequency of the magnetic film structure according to the fan speed; The magnitude of the current flowing into the electromagnetic induction coil is adjusted according to the vibration frequency of the obtained magnetic film structure.

7. The control method of a range hood having a magnetic film structure according to claim 6, characterized in that: The method for obtaining the vibration frequency of the magnetic film structure according to the fan speed is: f=v*a / 60, where f is the vibration frequency of the magnetic film structure, v is the fan speed, and a is the number of blades in the fan.

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