Magnetic knob and electric appliance

Abstract

The utility model discloses a magnetic knob which comprises a stator component, a rotor component, a magnetic detection assembly and a magnetic field modulation module, the magnetic detection assembly comprises a magnetic body and a magnetic sensor, and the magnetic field modulation module is provided with a first area and a second area which are distributed along the circumferential direction of the magnetic knob. The first area and the second area sequentially pass through a preset position when the magnetic field modulation module rotates, and at least one of the first area and the second area is used for enabling a magnetic field generated by the magnetic body at the magnetic sensor to change when the first area and the second area are located at the preset position, so that a magnetic field signal detected by the magnetic sensor when the first area is located at the preset position; different from a magnetic field signal detected when the magnetic sensor is located at a preset position in the second area, the magnetic sensor is electrically connected with the post-stage circuit, and the post-stage circuit calculates rotation of the rotor part according to output of the magnetic sensor. In addition, the utility model further discloses an electric appliance.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of knob, especially a kind of magnetic knob and electric appliance. BACKGROUND

[0002] Prior art adopts the combination of magnet and magnetic sensor to detect the relative rotation of two objects, and the basic method includes: fixing magnet in one of the two objects relative rotation, fixing magnetic sensor in the other, and detecting the relative rotation by the way of magnetic sensor sensing magnet.

[0003] In order to improve the detection accuracy of relative rotation, prior art usually sets multiple magnets or multiple magnetic sensors along the relative rotation stroke, for example, in the scheme of Chinese patent CN217606733U, the specification paragraph

[0004] discloses a wireless magnetic knob with display screen, which is applied to control electric appliance, the electric appliance is provided with operation panel, the wireless magnetic knob is provided with first magnetic positioning block inside, the rear of the operation panel is provided with second magnetic positioning block, the first and second magnetic positioning blocks are attracted to each other, so that the wireless magnetic knob can be adsorbed on the surface of the operation panel, the shell of the wireless magnetic knob is provided with display screen, display circuit board, power supply unit and rotation angle signal unit, the rear of the operation panel is provided with first receiving unit for receiving and interpreting the rotation angle signal unit; The shell of the wireless magnetic knob includes face cover and bottom shell, the face cover is provided with face cover side wall, the face cover side wall is buckled with display support, the display support is installed with the display screen, the power supply unit is provided below the display support, the first magnetic positioning block and the rotation angle signal unit are installed on the bottom wall of the bottom shell; The rear of the operation panel is also provided with electric appliance main control board, the first receiving unit is electrically connected with the electric appliance main control board, the electric appliance main control board is communicated and connected with the display circuit board through wireless transmission module, and the electric appliance main control board is provided with microprocessor.

[0004] The specification paragraph

[0010] further discloses that: the first magnetic positioning block is annular magnet, the rotation angle signal unit is third magnetic block, the third magnetic block is in the ring center of the first magnetic positioning block, and the first receiving unit detects the rotation state of the third magnetic block and outputs rotation state signal to microprocessor.

[0005] The contrast file sets multiple magnets to realize the detection of rotation state signal, however, whether using multiple magnets or multiple sensors, it will improve the complexity of the design of structure and the cost of structure. UTILITY MODEL CONTENT

[0006] The utility model aims at providing magnetic knob and electric appliance.

[0007] The utility model provides a technical scheme for: providing a magnetic knob, including stator part and rotatable rotor part relative to the stator part, still including:

[0008] The magnetic detection assembly and the magnetic field modulation module, and one of the magnetic detection assembly and the magnetic field modulation module is fixed to the stator part, and the other is fixed to the rotor part;

[0009] The magnetic detection assembly includes the magnetism and the magnetic sensor of relative fixed setting;

[0010] The magnetic field modulation module has the first area and the second area along the circumferential distribution of the magnetic knob, in the process that the magnetic field modulation module rotates relative to the magnetic detection assembly, the first area and the second area pass through the preset position adjacent to the magnetic detection assembly in turn;

[0011] At least one of the first area and the second area is used to make the magnetic field generated by the magnetic body change at the magnetic sensor when being located at the preset position, so that the magnetic field signal detected by the magnetic sensor when the first area is located at the preset position is different from the magnetic field signal detected by the magnetic sensor when the second area is located at the preset position;

[0012] The magnetic sensor is electrically connected with the rear circuit, and the rear circuit is used to receive the output of the magnetic sensor to calculate the rotation of the rotor part.

[0013] The number of the magnetic detection assembly is at least two groups, each group of the magnetic detection assembly is distributed along the circumference of the magnetic knob, and each group of the magnetic detection assembly correspondingly has a preset position.

[0014] The magnetic field modulation module is configured as an annular structure or a sector structure or a circular structure.

[0015] The first area is used to guide the magnetic field generated by the magnetic body to deviate from the direction of the magnetic sensor when being located at the preset position, so that the magnetic field signal detected by the magnetic sensor is weakened;

[0016] Alternatively, the first area is used to guide the magnetic field generated by the magnetic body to pass through the magnetic sensor when being located at the preset position, so that the magnetic field signal detected by the magnetic sensor is enhanced.

[0017] The number of the first area and the second area is multiple, and each first area and each second area is alternately distributed along the circumference of the magnetic knob;

[0018] The first area is a magnetic conductive material structure, and the second area is a gap or a non-magnetic conductive material structure.

[0019] The preset position is located between the corresponding magnetic body and the magnetic sensor.

[0020] The magnetic detection assembly is fixed to the stator component, and the magnetic field modulation module is fixed to the rotor component.

[0021] The rotor component comprises a cylindrical shell and a support part integrally connected to the inner side of the cylindrical shell, and the magnetic field modulation module is fixed to the support part.

[0022] The magnetic body and the magnetic sensor are located on the upper side and the lower side of the support part respectively, the rotor component drives the magnetic field modulation module to rotate along the circumference of the magnetic knob through the support part, and the first area and the second area pass through between the magnetic body and the magnetic sensor in turn.

[0023] The magnetic body is a rotary body structure and is magnetized in the axial direction.

[0024] The magnetic sensor is a switch type sensor.

[0025] In a second aspect, the technical scheme provided by the utility model is:

[0026] The utility model provides a kind of electric appliance, and the electric appliance is configured with the magnetic knob.

[0027] Compared with prior art, in the magnetic knob of the utility model, the magnetic field modulation module is arranged, the magnetic field modulation module has the first area and the second area distributed along the circumference of the magnetic knob, the first area and the second area pass through preset position in turn when the magnetic field modulation module rotates, and are used to modulate the signal generated by the magnetic body at the magnetic sensor, so that the magnetic field signal detected by the magnetic sensor when the first area is located at the preset position is distinguished from the magnetic field signal detected by the magnetic sensor when the second area is located at the preset position.

[0028] Therefore, in the process of rotating the magnetic field modulation module, the magnetic sensor can distinguish whether the preset position is the first area or the second area, so as to detect the rotation of the magnetic field modulation module, and in the application, the number of groups of different magnetic field signals detected by the magnetic sensor is equal to the number of groups of the first area and the second area, so that the number of groups of magnetic field signals detected by the magnetic sensor can be increased by increasing the number of groups of the first area and the second area, so as to facilitate to improve the detection accuracy without increasing the number of magnetic bodies / magnetic sensors to improve the detection accuracy, which is conducive to controlling cost.

[0029] In addition, the prior art magnetic body needs to rotate relative to the magnetic sensor, while the magnetic sensor of the present application is relatively fixed with the magnetic body, and only the magnetic field modulation module needs to rotate along the circumference of the magnetic knob, the rotation of the magnetic field modulation module is associated with the rotation of the rotor component of the magnetic knob, so that the rotation of the rotor component of the magnetic knob can be detected, which is beneficial to simplify the structure design.

[0030] The present application will become more apparent with the following description and accompanying drawings, which are used to explain the embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The magnetic sensor generates an induced voltage under a magnetic field.

[0032] Figure 2 It is a perspective view of the magnetic knob of the present application.

[0033] Figure 3 It is a cross-sectional view of the magnetic knob of the present application.

[0034] Figure 4 It is an exploded view of the magnetic knob of the present application.

[0035] Figure 5 It is a schematic view of the magnetic field modulation module, the first magnetic body and the first magnetic sensor in the first alternative embodiment of the magnetic knob of the present application.

[0036] Figure 6 It is a schematic view of the magnetic detection assembly and the magnetic field modulation module in the second alternative embodiment of the magnetic knob of the present application.

[0037] Figure 7 It is a schematic view of the magnetic detection assembly and the magnetic field modulation module in the third alternative embodiment of the magnetic knob of the present application.

[0038] Figure 8 It is a schematic view of the magnetic detection assembly and the magnetic field modulation module in the fourth alternative embodiment of the magnetic knob of the present application. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application.

[0040] In order to make the technical problems, technical solutions and beneficial effects of the present application more clear, the present application will be further described in detail in the following with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0041] It is to be noted that when an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or indirectly connected to the other element.

[0042] It is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like, indicate directions or positions based on the directions or positions shown in the drawings, and are used for convenience of description and simplification of description only, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the application.

[0043] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and cannot be construed as indicating or implying relative importance or an implied indication of the number of technical features indicated. Therefore, features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0044] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the present application belong. The terms (such as those defined in commonly used dictionaries) will be interpreted as having a meaning that is the same as the contextual meaning in the relevant technical field and will not be interpreted as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of the present application.

[0045] First of all, it should be noted that the magnetic body is made of a substance or material capable of generating a magnetic field signal. The magnetic body can be divided into: permanent magnet, i.e. the magnet capable of maintaining its magnetism for a long time, the permanent magnet is a hard magnet, which is not easy to lose magnetism and is not easy to be magnetized, including aluminum-nickel-cobalt, samarium-cobalt, ferrite and neodymium-iron-boron magnet, etc.; soft magnet, as a material for magnetic conductor and electromagnet, most of them are soft magnets, the polarity of soft magnet changes with the polarity of the applied magnetic field, and the soft magnet includes silicon steel sheet and soft magnetic core.

[0046] It should be noted that the magnetic sensor generally includes a Hall sensor (Hall), an anisotropic magnetoresistance sensor (AMR), a tunneling magnetoresistance sensor (TMR), a giant magnetoresistance sensor (GMR), and the like. Regardless of the above magnetic sensor, the principle is that the functional layer of the magnetic sensor generates a physical effect under the action of the magnetic field generated by the magnetic body. The physical effect is specifically a Hall effect, an anisotropic magnetoresistance effect, a tunneling magnetoresistance effect, and the like.

[0047] Figure 1 A schematic diagram of the magnetic sensor generating an induced voltage under a magnetic field is shown.

[0048] Figure 1 Taking the Hall effect as an example, the axial magnetization magnetic body 1a generates a magnetic field signal that passes through the functional layer of the magnetic sensor. In this embodiment, the magnetic field signal passes through the Hall element 2a of the energized Hall effect sensor, and the Hall element 2a generates a Hall induced voltage that can be measured by a voltmeter V.

[0049] It should be noted that the "functional layer" in the above is a structure layer that can generate a physical effect under the action of the magnetic field signal generated by the magnetic body, such as Figure 1 The Hall element 2a (or "Hall disc") shown, while the structure layer of AMR, TMR, and GMR is a multi-level structure.

[0050] Reference Figure 1 Taking the axial magnetization magnetic body 1a as an example, the magnetic field signal of the axial magnetization magnetic body 1a is a closed curve like the magnetic field signal of the magnetic body of other directions, emitted from the north pole of the magnetic body 1a and the south pole returns (for more concise expression, part of the magnetic field signal is represented by a broken line). We know that whether it is axial magnetization, radial magnetization or other direction magnetization, the closer to the south pole or north pole, the more concentrated the distribution of the magnetic field signal, and the farther away from the south pole or north pole, the more dispersed the distribution of the magnetic field signal.

[0051] Figure 2 A perspective view of the magnetic knob embodiment of the utility model.

[0052] Figure 3 A sectional view of the magnetic knob embodiment of the utility model.

[0053] Figure 4 An exploded view of the magnetic knob embodiment of the utility model.

[0054] Reference Figures 2 to 4 In the embodiment shown, the utility model provides a magnetic knob including a stator component 10, a rotor component 9 rotatable relative to the stator component 10, and further comprising:

[0055] The magnetic detection assembly 1 is arranged with a magnetic field modulation module 3, and one of the magnetic detection assembly 1 and the magnetic field modulation module 3 is fixed to the stator component 10, and the other is fixed to the rotor component 9;

[0056] The magnetic detection assembly 1 comprises a magnetic body 11 and a magnetic sensor 12, and the magnetic body 11 and the magnetic sensor 12 are fixedly arranged opposite to each other and are both fixed to the stator component 10;

[0057] The magnetic field modulation module 3 is rotatably arranged along the circumference of the magnetic knob opposite to the magnetic body 11 and the magnetic sensor 12, and the magnetic field modulation module 3 has a first region 31 and a second region 32 distributed along the circumference of the magnetic knob, and the first region 31 and the second region 32 pass through the preset position adjacent to the magnetic detection assembly 1 in turn when the magnetic field modulation module 3 rotates, and are used for modulating the magnetic field signal generated by the magnetic body 11 at the magnetic sensor 12;

[0058] The preset position is understood, and when the magnetic field modulation module 3 rotates, the first region 31 and the second region 32 pass through the preset position adjacent to the magnetic detection assembly 1 in turn, and the magnetic sensor 12 can obviously detect whether the first region 31 or the second region 32 passes through the preset position.

[0059] At least one of the first region 31 and the second region 32 is used for causing the magnetic field generated by the magnetic body 11 at the magnetic sensor 12 to obviously change when located at the preset position, so that the magnetic field signal detected by the magnetic sensor 12 when the first region 31 is located at the preset position is different from the magnetic field signal detected by the magnetic sensor 12 when the second region 32 is located at the preset position.

[0060] The magnetic sensor 12 is electrically connected with a rear-stage circuit, and the rear-stage circuit is used for receiving the output of the magnetic sensor 12 to calculate the rotation of the magnetic field modulation module 3, that is, based on the output of the magnetic sensor 12, the rear-stage circuit can calculate the rotation of the magnetic field modulation module 3, and then obtain the rotation of the rotor component 9, for example, the rotation information of the rotor component 9 can include the rotation angle and the rotation speed of the rotor component 9, or the combination of the two.

[0061] Figure 5 In the first alternative embodiment of the magnetic knob of the utility model, the schematic diagram of the magnetic field modulation module, the first magnetic body and the first magnetic sensor.

[0062] In the embodiment, the magnetic detection assembly 1 comprises a magnetic body 11 and a magnetic sensor 12, and the magnetic body 11 and the magnetic sensor 12 are fixedly arranged opposite to each other;

[0063] The magnetic field signal detected by the magnetic sensor 12 when the first area 31 is at the preset position is different from the magnetic field signal detected by the magnetic sensor 12 when the second area 32 is at the preset position. Specifically, the magnetic sensor 12 detects a first magnetic field signal when the first area 31 is at the preset position, and detects a second magnetic field signal different from the first magnetic field signal when the second area 32 is at the preset position.

[0064] In this embodiment, since the magnetic body 11 and the magnetic sensor 12 are fixedly arranged opposite to each other, it is considered that the magnetic field signal generated by the magnetic body 11 at the position of the magnetic sensor 12 is stable and unchangeable before the magnetic field modulation module 3 is intervened. It is not difficult to understand that in actual application scenarios, it is necessary to avoid the influence of the magnetic sensor 12 by the magnetic field signal from the magnetic body 11 through structural design or software means, that is, to prevent the magnetic sensor 12 from being affected by the interference field.

[0065] In one embodiment, referring to Figure 5 , the first area 31 is configured to guide the magnetic field generated by the magnetic body 11 to deviate from the direction of the magnetic sensor 12 when at the preset position, so that the magnetic field signal detected by the magnetic sensor 12 is shielded or weakened.

[0066] In one embodiment, referring to Figure 5 , the first area 31 is configured to guide the magnetic field generated by the magnetic body 11 to pass through the magnetic sensor 12 when at the preset position, so that the magnetic field signal detected by the magnetic sensor 12 is enhanced.

[0067] In the above two embodiments, the distance between the magnetic field modulation module 3 and the magnetic body 11 can be adjusted, and / or the distance between the magnetic field modulation module 3 and the magnetic sensor 12 can be adjusted, or the first area 31 can be provided with different material structure characteristics, so as to change the direction of the magnetic field signal, that is, to guide to the direction deviating from the magnetic sensor 12 or to the direction passing through the magnetic sensor 12.

[0068] Referring to the optional embodiment shown in Figure 5 , the magnetic field modulation module 3 is configured in a ring structure, and the first area 31 and the second area 32 on the magnetic field modulation module 3 are distributed along the ring. It is not difficult to understand that when the magnetic field modulation module is in a shape similar to a sector structure, a circular structure, a regular polygon structure, etc., it can also be implemented by referring to the optional embodiment shown in Figure 5 .

[0069] In combination with Figure 5The "preset position" is understood as follows: the magnetic field modulation module 3 has a first region 31 and a second region 32 distributed along the circumference of the magnetic knob, and the first region 31 and the second region 32 rotate synchronously with the magnetic field modulation module 3. It is easily understood that the preset position is set to set an anchor point, and when the magnetic field modulation module 3 rotates, it can be considered that the first region 31 and the second region 32 rotate relative to the anchor point. The first region 31 and the second region 32 can be considered as the minimum resolution of the rotation of the magnetic field modulation module 3 along the circumference of the magnetic knob. At least one of the first region 31 and the second region 32 can affect the magnetic field signal generated by the magnetic body 11 at the magnetic sensor 12 at the preset position, for example, the first region 31 can shield the magnetic field signal, and the second region 32 does not shield the magnetic field signal, that is, the intensity of the magnetic field signal passing through the first region 31 is significantly attenuated, and the intensity of the magnetic field signal passing through the second region 32 is not significantly attenuated.

[0070] In one embodiment, when the first region 31 and the second region 32 rotate along the circumference of the magnetic knob, the first region 31 functions as a magnetic shield, and the second region 32 does not function as a magnetic shield. When the first region 31 is located at the preset position, the magnetic field signal generated by the magnetic body 11 at the magnetic sensor 12 is affected, and further, the first region 31 causes the magnetic field signal generated by the magnetic body 11 at the magnetic sensor 12 to be weakened or even attenuated to 0. When the first region 31 is located at the preset position, the signal detected by the magnetic sensor 12 is defined as a first magnetic field signal. When the second region 32 is located at the preset position, the magnetic field signal generated by the magnetic body 11 at the magnetic sensor 12 is not affected, and the magnetic sensor 12 detects a second magnetic field signal different from the first magnetic field signal.

[0071] Figure 6 In a second alternative embodiment of the magnetic knob of the utility model, a partial structure diagram of the magnetic detection assembly cooperating with the magnetic field modulation module is shown.

[0072] Figure 7 In a third alternative embodiment of the magnetic knob of the utility model, a partial structure diagram of the magnetic detection assembly cooperating with the magnetic field modulation module is shown.

[0073] Reference is made to Figure 6 , 7 The difference between the two alternative embodiments shown in Figure 5 and the embodiment shown in Figure 6 , 7In the two optional embodiments shown, the number of the magnetic detection assemblies is two, the magnetic field modulation module 3 is in a ring structure, and the two magnetic detection assemblies are distributed along the ring direction of the magnetic field modulation module 3; the two magnetic detection assemblies include a first magnetic detection assembly 1a and a second magnetic detection assembly 1b, wherein the first magnetic detection assembly 1a includes a first magnetic body 11a and a first magnetic sensor 12a, and the second magnetic detection assembly 1b includes a second magnetic body 11b and a second magnetic sensor 12b. Adjacent to each of the magnetic detection assemblies, there is a preset position corresponding thereto: a first preset position 6 corresponding to the first magnetic detection assembly 1a and a second preset position 7 corresponding to the second magnetic detection assembly 1b.

[0074] The magnetic field modulation module 3 is arranged to rotate along the circumferential direction of the magnetic knob relative to the first magnetic detection assembly 1a and the second magnetic detection assembly 1b, and the first region 31 and the second region 32 pass through the first preset position 6 and the second preset position 7 in turn when the magnetic field modulation module 3 rotates, and are used to modulate the magnetic field signal generated by the first magnetic body 11a at the first magnetic sensor 12a and modulate the magnetic field signal generated by the second magnetic body 11b at the second magnetic sensor 12b.

[0075] The magnetic field modulation module 3 has a plurality of first regions 31 and second regions 32 distributed along the circumferential direction of the magnetic knob, and when one of the first regions 31 is located at the second preset position 7, the second magnetic sensor 12b detects a third magnetic field signal;

[0076] When one of the second regions 32 is located at the second preset position 7, the second magnetic sensor 12b detects a fourth magnetic field signal different from the third magnetic field signal.

[0077] When one of the first regions 31 is located at the second preset position 7, it plays a role of shielding the magnetic field signal generated by the second magnetic body 11b at the second magnetic sensor 12b; and when one of the second regions 32 is located at the second preset position 7, it does not play a role of shielding the magnetic field signal generated by the second magnetic body 11b at the second magnetic sensor 12b.

[0078] Figure 6 、 7 In the two optional embodiments shown, the magnetic field modulation module 3 has a plurality of first regions 31 and second regions 32 alternately distributed along the circumferential direction of the magnetic knob;

[0079] Taking the case of rotating the magnetic field modulation module 3 to the right as an example, when one of the first regions 31 rotates to the first preset position 6, the corresponding one of the second regions 32 is at the second preset position 7, and the second magnetic sensor 12b detects the third magnetic field signal. Figure 6the state of one of the second regions 32 being about to enter the second preset position 7, or correspondingly one of the first regions 31 being about to leave the first preset position 6. Figure 7 the state of one of the second regions 32 leaving the second preset position 7 (corresponding to one of the first regions 31 entering the first preset position 6).

[0080] Referring to Figure 6 , taking the example of the magnetic field modulation module 3 rotating to the right, when one of the first regions 31 rotates to the first preset position 6, the first magnetic sensor 12a outputs the first magnetic field signal "0", and the second magnetic sensor 12b outputs a signal about to switch from the first magnetic field signal "0" to the second magnetic field signal "1" because one of the second regions 32 is in the state of about to enter the second preset position 7. In this way, the rear circuit electrically connected to the first magnetic sensor 12a and the second magnetic sensor 12b can determine the rotation direction of the magnetic field modulation module 3.

[0081] Referring to Figure 7 , taking the example of the magnetic field modulation module 3 rotating to the right, when one of the first regions 31 rotates to the first preset position 6, the second magnetic sensor 12b outputs a signal about to switch from the second magnetic field signal "1" to the first magnetic field signal "0" because one of the second regions 32 is in the state of leaving the second preset position 7.

[0082] Figure 6 and 7 In the embodiment shown, the first regions 31 of the magnetic field modulation module 3 can function as magnetic shielding, which are of a magnetic conductive material structure. The magnetic conductive material may, for example, be a soft magnetic material, which has high magnetic permeability and low residual magnetism, and is generally made of metal alloys such as iron, nickel, and cobalt. The second regions 32 do not function as magnetic shielding and are of a non-magnetic conductive material structure.

[0083] Specifically, the magnetic conductive material structure of each of the first regions 31 is integrally formed and connected to form the magnetic field modulation module 3, and the second regions 32 are hollow structures arranged on the magnetic field modulation module 3.

[0084] Referring to Figure 6 , 7 In the corresponding embodiment, the first magnetic body 11a is of a columnar structure, and the magnetization direction of the first magnetic body 11a is axial magnetization. In order to better function as magnetic shielding, the projection of the first region 31 along the magnetization direction of the first magnetic body 11a can cover the first magnetic body 11a when the first region 31 is located at the first preset position 6.

[0085] In one embodiment, the preset position is located between the corresponding magnetic body and the magnetic sensor. Referring toFigure 6 The south pole and the north pole of the first magnetic body 11a and the second magnetic body 11b are distributed along the tangential direction of the rotation of the magnetic field modulation module 3, or in other words, the tangential direction of the rotation of the rotor component 9, the first preset position 6 is located between the first magnetic body 11a and the first magnetic sensor 12a; the second preset position 7 is located between the second magnetic body 11b and the second magnetic sensor 12b; specifically, the first preset position 6 is located between the first magnetic body 11a and the first magnetic sensor 12a, when one of the first areas 31 is located at the first preset position 6, the first area 31 shields the magnetic field emitted from the north pole of the first magnetic body 11a and generated at the first sensor 12a.

[0086] The second preset position 7 is located between the second magnetic body 11b and the second magnetic sensor 12b, if one of the first areas 31 is located at the second preset position 7, the first area 31 shields the magnetic field emitted from the north pole of the second magnetic body 11b and generated at the second sensor 12b.

[0087] Figure 8 In the fourth optional embodiment of the magnetic knob of the utility model, the partial structure diagram of the cooperation of the magnetic detection assembly and the magnetic field modulation module is shown.

[0088] Figure 8 In the optional embodiment shown, the number of the magnetic detection assemblies is two groups, the magnetic field modulation module 3 is a ring structure, and the two groups of detection assemblies are distributed along the ring direction of the magnetic field modulation module 3; the two groups of magnetic detection assemblies include a third magnetic detection assembly 1c and a fourth magnetic detection assembly 1d, wherein the third magnetic detection assembly 1c includes a third magnetic body 11c and a third magnetic sensor 12c, and the fourth magnetic detection assembly 1d includes a fourth magnetic body 11d and a fourth magnetic sensor 12d. Wherein, the setting mode of the south pole and the north pole of the third magnetic body 11c and the fourth magnetic body 11d is different from that of the embodiment shown. Figure 6 、 7 The south pole and the north pole of the third magnetic body 11c and the fourth magnetic body 11d are distributed along the tangential direction of the rotation of the magnetic field modulation module 3, or in other words, the tangential direction of the rotation of the rotor component 9;

[0089] Taking the third magnetic detection assembly 1c as an example for description: the third magnetic body 11c, the third magnetic sensor 12c and the first preset position 6 are distributed along the tangential direction of the rotation of the magnetic field modulation module 3, or in other words, the tangential direction of the rotation of the rotor component 9.

[0090] Specifically, the third magnetic sensor 12c is arranged between the third magnetic body 11c and the first preset position 6, when one of the first regions 31 is located at the first preset position 6, the first region 31 shields the magnetic field generated at the third sensor 12c from the north pole of the third magnetic body 11c. The principle of magnetic field shielding is described by taking the third magnetic body 11c, the third magnetic sensor 12c, the first region 31 and the first preset position 6 as an example: the magnetic field lines emitted from the north pole of the third magnetic body 11c return to the south pole of the third magnetic body 11c after passing through the third magnetic sensor 12c. Since the first region 31 is located at the first preset position 6, the first region 31 has a magnetic guiding effect, so that part of the magnetic force lines emitted from the north pole of the third magnetic body 11c is guided to the first region 31 instead of passing through the third magnetic sensor 12c, so that the magnetic field intensity detected by the third magnetic sensor 12c is weaker than when the first region 31 is not at the first preset position 6, so that the first region 31 has a magnetic shielding effect.

[0091] Figure 8 As shown, for the fourth magnetic detection assembly 1d, the fourth magnetic body 11d, the fourth magnetic sensor 12d and the second preset position 7, the positions and interaction relationships of the three can be correspondingly referred to the description of the third magnetic detection assembly 1c as shown. Figure 8

[0092] In one embodiment, referring to Figure 4 , the magnetic sensor 12 is a switch type sensor.

[0093] In the above embodiment, the magnetic sensor 12 is a switch type sensor, when one of the first regions 31 rotates through the preset position, at this time the magnetic field signal generated by the magnetic body 11 at the magnetic sensor 12 is shielded, and the magnetic sensor 12 outputs an off signal, when one of the second regions 32 rotates through the preset position, at this time the magnetic field signal generated by the magnetic body 11 at the magnetic sensor 12 is not shielded, and the magnetic sensor 12 outputs an on signal; and when the magnetic sensor 12 is a switch type sensor, the working principle of the magnetic sensor 12 is the same as that of the magnetic sensor 12.

[0094] Referring to Figures 2 to 4 , the utility model discloses a magnetic knob, including base 8, stator part 10 and rotor part 9, base 8 with stator part 10 fixed connection, rotor part 9 relative to base 8 and stator part 10 rotatably arranged. Can be programmed to the rotation of rotor part 9, for example the angle of rotation, speed and its combination to form various control instructions, realize the control of the electrical appliance / machinery of electrically connected with the magnetic knob. ​

[0095] The magnetic field modulation module 3 rotates along with the rotor component 9 in the circumferential direction of the magnetic knob, the magnetic body 11 and the magnetic sensor 12 are arranged on both sides of the magnetic field modulation module 3 respectively, the first area 31 and the second area 32 pass through the preset position in turn when the magnetic field modulation module 3 rotates, and are used to modulate the magnetic field signal generated by the magnetic body 11 at the magnetic sensor 12, so as to realize the programming of the rotation angle, speed and combination thereof of the rotor component 9 to form various control instructions, and realize the control of the electrical appliances / mechanical devices and the like electrically connected with the magnetic knob.

[0096] Reference Figures 2 to 4 The stator component 10 is described, including a display screen 101, a display screen support 102, a circuit board 13 for mounting the magnetic sensor 12, and a magnetic body mounting support 14 for mounting the magnetic body 11, wherein the display screen 101 is used to display the control menu of the magnetic knob, the circuit board 13 is used to power the magnetic sensor 2, receive the output signal of the magnetic sensor 2, process the output signal of the magnetic sensor 2, and display the processing result on the display screen 101;

[0097] The rotor component 9 includes a cylindrical shell 91 and a support part 90 integrally connected to the inner side of the cylindrical shell 91, the support part 90 is an annular structure arranged horizontally, wherein the upper end surface of the support part 90 is provided with a groove for fixing the magnetic field modulation module 3, and the magnetic field modulation module 3 is fixed in the groove.

[0098] The position relationship between the magnetic body 11 and the magnetic sensor 12, the magnetic sensor 12 is located on the upper side of the support part 90, the magnetic body 11 is located on the lower side of the support part 90, the rotor component 9 drives the magnetic field modulation module 3 to rotate in the circumferential direction through the support part 90, and the first area 31 and the second area 32 pass through between the magnetic body 11 and the magnetic sensor 12 in turn.

[0099] The upper side of the support part 90 and the inner side of the cylindrical shell 91 form an upper side space for accommodating the display screen support 102, the display screen support 102 is accommodated in the upper side space, the lower side of the support part 90 and the inner side of the cylindrical shell 91 form a lower side space for accommodating the magnetic body mounting support 14, the magnetic body mounting support 14 is accommodated in the lower side space, and the outer wall of the cylindrical shell 91 is the holding part when the magnetic knob is used.

[0100] The magnetic body mounting support 14 is provided with an embedding groove 141, and the magnetic body 1 is embedded in the embedding groove 141 for fixation;

[0101] The upper side of the display screen support 102 has a containing groove 121 communicated with a circular open structure, the display screen 101 is fixed in the containing groove 121 through the circular open structure, the circuit board 13 is installed in the containing groove 121, the magnetic sensor 12 is installed on the circuit board 13 and is located directly above the magnetic body 11, and the preset position is located between the magnetic body 11 and the magnetic sensor 2. The magnetic knob is used for identifying the angle, speed and combination of the rotor part 9 through the magnetic sensor 2, and realizing the operation and control of the electric appliance / mechanical equipment. For example, in the washing machine, the fast washing, slow washing, rubbing and dehydration of the washing machine can be selected and controlled; for example, in the electric rice cooker, the fast cooking, slow stewing, stewing, mutton and chicken can be selected and controlled.

[0102] It should be noted that, in some embodiments, the base 8 can be part of the shell of the electric appliance / mechanical equipment controlled by the magnetic knob.

[0103] Reference Figure 4 The magnetic field modulation module 3 is made of a material with magnetic shielding effect, and has a first area 31 and a second area 32 distributed along the circumference of the magnetic knob. Specifically, the second area 31 is arranged in a zigzag shape, and the gap between two adjacent first areas 31 forms the second area 32.

[0104] In addition, the utility model also discloses an electric appliance, which is provided with the magnetic knob.

[0105] The above-mentioned is only the preferred embodiment of the utility model, and of course cannot limit the scope of the utility model, so the equivalent changes made according to the patent application scope of the utility model still belong to the scope covered by the utility model.

Claims

1. A magnetic knob, comprising a stator component and a rotor component rotatable relative to said stator component, characterized in that, Also includes: A magnetic detection component and a magnetic field modulation module, wherein one of the magnetic detection component and the magnetic field modulation module is fixed to the stator component and the other is fixed to the rotor component; The magnetic detection component includes a magnetic body and a magnetic sensor that are relatively fixedly arranged; The magnetic field modulation module has a first region and a second region distributed circumferentially along the magnetic knob. During the rotation of the magnetic field modulation module relative to the magnetic detection component, the first region and the second region sequentially pass through a preset position adjacent to the magnetic detection component. At least one of the first region and the second region is used to cause a change in the magnetic field generated by the magnetic body at the magnetic sensor when the magnetic body is located at the preset position, so that the magnetic field signal detected by the magnetic sensor when the first region is located at the preset position is different from the magnetic field signal detected by the magnetic sensor when the second region is located at the preset position. The magnetic sensor is electrically connected to the subsequent circuit, which receives the output of the magnetic sensor to calculate the rotation of the rotor component.

2. The magnetic knob as described in claim 1, characterized in that, The number of magnetic detection components is at least two sets, each set of magnetic detection components is distributed along the circumference of the magnetic knob, and each set of magnetic detection components has a corresponding preset position.

3. The magnetic knob as described in claim 1, characterized in that, The magnetic field modulation module is configured as a ring structure, a fan-shaped structure, or a circular structure.

4. The magnetic knob as described in claim 1, characterized in that, The first region is used to guide the magnetic field generated by the magnetic body in a direction away from the magnetic sensor when it is located at the preset position, so as to weaken the magnetic field signal detected by the magnetic sensor; Alternatively, the first region is used to guide the magnetic field generated by the magnetic body toward the direction passing through the magnetic sensor when it is located at the preset position, so as to enhance the magnetic field signal detected by the magnetic sensor.

5. The magnetic knob as described in any one of claims 1 to 4, characterized in that, There are multiple first regions and multiple second regions, and each first region and each second region are alternately distributed along the circumference of the magnetic knob; The first region is a magnetically conductive material structure, and the second region is a void or non-magnetically conductive material structure.

6. The magnetic knob as described in any one of claims 1 to 4, characterized in that, The preset position is located between the corresponding magnetic body and the magnetic sensor.

7. The magnetic knob as described in claim 1, characterized in that, The magnetic detection component is fixed to the stator component, and the magnetic field modulation module is fixed to the rotor component.

8. The magnetic knob as described in claim 7, characterized in that, The rotor component includes a cylindrical outer shell and a support portion integrally connected to the inner side of the cylindrical outer shell, and the magnetic field modulation module is fixed to the support portion; The magnetic body and the magnetic sensor are located, one on the upper side of the support and the other on the lower side of the support. The rotor component drives the magnetic field modulation module to rotate circumferentially along the magnetic knob through the support. The first region and the second region pass between the magnetic body and the magnetic sensor in sequence.

9. The magnetic knob as described in any one of claims 1 to 4, characterized in that, The magnetic body has a rotating body structure and the magnetization direction is along the axial direction; The magnetic sensor is a switch-type sensor.

10. An electrical appliance, characterized in that, The electrical appliance is equipped with a magnetic knob as described in any one of claims 1 to 9.

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