Fan and its gear knob device

Abstract

The present application provides a gear knob device, comprising a recessed portion (1) and a knob (2), wherein the knob (2) is at least partially received in the recessed portion (1) and can rotate relative to the recessed portion (1), the recessed portion (1) is provided with a first stop portion (150), a second stop portion (151), and a third stop portion (152), the knob (2) is provided with a first interference portion (240) and a second interference portion (241), the knob (2) is limited to rotate between a first angular position and a third angular position, and when the knob (2) is rotated to the first angular position, the first interference portion (240) is stopped by the first stop portion (150), and when the knob (2) is rotated to the third angular position, the second interference portion (241) is stopped by the third stop portion (152); if the knob (2) removes the second interference portion (241), the knob (2) is limited to rotate between the first angular position and a second angular position, and after the knob (2) is rotated from the first angular position to the third angular position, it can continue to rotate until it reaches the second angular position, and when the knob (2) is rotated to the second angular position, the first interference portion (240) is stopped by the second stop portion (151).

Description

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 1, 2020, with application number 2020218786306, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to a gear knob device, and in particular to a gear knob device for a fan. Background Art

[0003] The gear knob device in the related technology includes a knob, and the knob is rotated to drive the gear shaft of the electrical appliance to rotate to achieve the control of turning the electrical appliance on and off and / or the control of the gear size. Different models of electrical appliances usually require different gear knob devices to provide different knob rotation angle ranges, and the development and manufacturing costs of the gear knob device need to be comprehensively considered. Summary of the invention

[0004] In order to improve the structural versatility of a gear knob device, the present application provides a gear knob device, including a recessed portion and a knob, wherein the knob is at least partially accommodated in the recessed portion and can rotate relative to the recessed portion, the recessed portion is provided with a first stop portion, a second stop portion, and a third stop portion, the knob is provided with a first interference portion and a second interference portion, the knob is limited to rotation between a first angle position and a third angle position, when the knob is rotated to the first angle position, the first interference portion is stopped by the first stop portion, and when the knob is rotated to the third angle position, the second interference portion is stopped by the third stop portion; if the second interference portion is removed from the knob, the knob is limited to rotation between the first angle position and a second angle position and after the knob is rotated from the first angle position to the third angle position, it can continue to rotate until the second angle position, and when the knob is rotated to the second angle position, the first interference portion is stopped by the second stop portion.

[0005] Optionally, the recessed portion is also provided with a substrate and an external port, the substrate is opposite to the external port, the knob is installed to the recessed portion from the external port, the first stop portion, the second stop portion, and the third stop portion are respectively integrally connected to and protrude from the substrate, and the first stop portion, the second stop portion, and the third stop portion respectively extend from the substrate to the external port.

[0006] Optionally, the first interference portion and the first stop portion at least partially overlap in the circumferential direction around the rotation axis of the knob, the first interference portion and the second stop portion at least partially overlap in the circumferential direction around the rotation axis of the knob, the first interference portion and the third stop portion are completely offset in the circumferential direction around the rotation axis of the knob, and the second interference portion and the third stop portion at least partially overlap in the circumferential direction around the rotation axis of the knob. If the second interference portion is removed from the knob, the first interference portion passes radially outside the third stop portion during the rotation of the knob from the first angular position to the second angular position.

[0007] Optionally, the recessed portion is also provided with a substrate, the substrate is provided with a through hole, the rotation axis of the knob passes through the through hole, the knob is also provided with a semi-annular rib, the semi-annular rib surrounds one side of the rotation axis of the knob, the semi-annular rib extends toward the substrate, and the second interference portion is integrally connected to the radial outer side of the semi-annular rib.

[0008] Optionally, the first stop portion and the second stop portion are opposite to each other in the circumferential direction of the rotation axis of the knob, the first stop portion and the third stop portion are completely offset in the circumferential direction of the rotation axis of the knob, and the second stop portion and the third stop portion are completely offset in the circumferential direction of the rotation axis of the knob.

[0009] Optionally, the recessed portion is further provided with a substrate, a first circumferential wall, and an external port, the substrate being opposite to the external port, the first circumferential wall surrounding the rotation axis of the knob, a slide groove being formed between the substrate and the first circumferential wall, the knob being provided with a snap portion, the snap portion being limited in the slide groove, and the snap portion rotates along the slide groove as the knob rotates relative to the recessed portion.

[0010] Optionally, the knob and the external port are located on the same side of the substrate, the external port and the slide groove are located on opposite sides of the first circumferential wall, and the gap between the edge of the first circumferential wall away from the external port and the substrate forms the slide groove.

[0011] Optionally, the first circumferential wall is provided with a notch, which at least separates the edge of the first circumferential wall away from the external port. The recessed portion also includes a connecting portion, which is connected between the substrate and the external port. The connecting portion is adjacent to the notch, and the snap portion can pass between the notch and the connecting portion as the knob rotates.

[0012] Optionally, the connecting part includes a first part and a second part connected between the substrate and the first part, the first part is located radially outside the corresponding notch, and the notch is located between the outer port and the second part. As the knob rotates, the snap portion can pass between the notch and the second part of the connecting part.

[0013] Optionally, the outer port is provided with an annular edge, the annular edge surrounds the knob, the first circumferential wall extends from the annular edge to the side where the substrate is located, the first part is integrally connected to the annular edge, and the second part is integrally connected to the substrate.

[0014] Optionally, the first part is connected to the second part by a bend, the second part extends radially outward from the outer periphery of the substrate, the projection of the second part along the knob rotation axis does not overlap with the projection of the first circumferential wall along the knob rotation axis, and the projection of the substrate along the knob rotation axis does not overlap with the projection of the first circumferential wall along the knob rotation axis.

[0015] Optionally, the outer circumference of the substrate is circular, the outer diameter of the substrate is smaller than the inner diameter of the first circumferential wall, and the interval between the edge of the first circumferential wall away from the outer port and the outer circumference of the substrate forms the slide groove.

[0016] Optionally, the knob can rotate relative to the recessed portion to drive a gear shaft to rotate, the substrate is provided with a through hole, the gear shaft passes through the substrate through the through hole, and one end of the gear shaft is accommodated in the knob.

[0017] Optionally, the knob is also provided with a second circumferential wall and an elastic arm, the first circumferential wall is located outside the second circumferential wall, the second circumferential wall is provided with a notch, the elastic arm is located in the notch, the buckle portion is part of the elastic arm, and the buckle portion is located at the end of the elastic arm away from the external port.

[0018] The present application also provides a fan, comprising the aforementioned gear knob device.

[0019] Optionally, the fan also includes a motor, fan blades driven by the motor, an outer cover shell exposed to the outside of the fan, a rear mesh cover, and a front mesh cover, wherein the fan blades are located between the rear mesh cover and the front mesh cover, the outer cover shell is an integrally formed one-piece part, the recessed portion is a part of the outer cover shell, the motor is located between the fan blades and the outer cover shell, the outer cover shell covers the rear side of the motor, the rear mesh cover is recessed toward the fan blades to form a recessed space, and the outer cover shell is accommodated in the recessed space.

[0020] Based on the present application, when developing a gear knob device, a technician in this field can produce two gear knob devices with different rotation angle ranges based solely on the presence or absence of the second interference portion or whether it is removed, so as to be applied to different models of electrical appliances. The difference between the molds of the two gear knob devices may only be in the corresponding second interference portion, so the difference is very small, which improves the versatility of the structural design and mold design of the gear knob device and reduces product development and manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is an exploded view of the fan;

[0022] Figure 2 is a cross-sectional view of the fan along the gear axis;

[0023] Figure 3 A three-dimensional view of the outer casing at one angle;

[0024] Figure 4 A three-dimensional view of the outer cover from another angle;

[0025] Figure 5 A three-dimensional view of the outer cover from another angle;

[0026] Figure 6 A three-dimensional diagram showing a knob at one angle;

[0027] Figure 7 This is a three-dimensional image of the knob from another angle;

[0028] Figure 8 This is a three-dimensional image of the knob from another angle;

[0029] Fig. 9 for Figure 2 An enlarged view of the gear knob device in FIG.

[0030] Fig.10 It is an enlarged cross-sectional view of the gear knob device (the cross section is perpendicular to the gear axis);

[0031] Fig.11 A three-dimensional diagram of the knob at one angle after the second interference portion is removed;

[0032] Fig.12 A three-dimensional diagram of the knob from another angle after the second interference portion is removed;

[0033] Fig.13 This is an enlarged cross-sectional view of the gear knob device after removing the second interference portion (the cross section is perpendicular to the gear axis). DETAILED DESCRIPTION

[0034] Reference Figures 1 to 10An embodiment shown in the figure discloses a fan and a gear knob device provided therein, wherein the gear knob device comprises a recessed portion 1 and a knob 2, wherein the knob 2 is at least partially accommodated in the recessed portion 1 and can rotate relative to the recessed portion 1, wherein the recessed portion 1 is provided with a first circumferential wall 10, an external port 11, a substrate 12, and a connecting portion 14, wherein the knob 2 and the external port 11 are located on the same side of the substrate 12, the substrate 12 is opposite to the external port 11, a slide groove 13 is formed between the substrate 12 and the first circumferential wall 10, and the knob 2 is provided with a buckle portion 200, which is limited in the slide groove 13, and the buckle portion 200 rotates along the slide groove 13 as the knob 2 rotates relative to the recessed portion 1. In this embodiment, through the cooperation between the slide groove 13 formed between the substrate 12 and the first circumferential wall 10 and the buckle portion 200 of the knob 2, the knob 2 is prevented from being separated from the recessed portion 1 and the knob 2 is promoted to be able to rotate and cooperate with the recessed portion 1 more smoothly, and the user experience is good.

[0035] The first circumferential wall 10 is in the shape of a circular ring as a whole. The first circumferential wall 10 surrounds the rotation axis of the knob 2. The gap between the edge of the first circumferential wall 10 away from the external port 11 and the base plate 12 forms the slide groove 13. The outer periphery of the base plate 12 is circular. The outer diameter of the base plate 12 is smaller than the inner diameter of the first circumferential wall 10. The gap between the edge of the first circumferential wall 10 away from the external port 11 and the circumferential edge of the base plate 12 forms the slide groove 13. The slide groove 13 is in the shape of a circular ring as a whole. In this patent application, the rotation axis of the knob 2 is set as the axial direction. The so-called radial direction in this patent application is relative to the rotation axis of the knob 2. The so-called circumferential direction in this patent application is also relative to the rotation axis of the knob 2.

[0036] The first circumferential wall 10 is provided with a notch 100, which extends from the edge of the first circumferential wall 10 away from the external port 11 toward the external port 11. The notch 100 at least separates the edge of the first circumferential wall 10 away from the external port 11. Such a design can enhance the deformability of the side of the first circumferential wall 10 adjacent to the slide groove 13, making it easier for the buckle part 200 to be inserted into the slide groove 13.

[0037] The connecting portion 14 is L-shaped, connected between the substrate 12 and the external port 11, adjacent to the notch 100, and the buckle portion 200 can pass through the notch 100 and the connecting portion 14 as the knob 2 rotates. The connecting portion 14 includes a first portion 140 and a second portion 141 connected between the substrate 12 and the first portion 140. The first portion 140 is located radially outward of the corresponding notch 100, the notch 100 is located between the external port 11 and the second portion 141, and the buckle portion 200 can pass through the notch 100 and the second portion 141 as the knob 2 rotates. The first portion 140 and the second portion 141 are bent and connected, and the first portion 140 and the second portion 141 are connected to form an L shape, the first portion 140 is perpendicular to the substrate 12, and the second portion 141 is coplanar with the substrate 12; the second portion 141 is integrally connected to the substrate 12, and the second portion 141 extends radially outward from the outer periphery of the substrate 12.

[0038] The notch 100 separates the first circumferential wall 10 in the circumferential direction around the rotation axis of the knob 2, and the connecting portion 14 is spaced from the first circumferential wall 10. The connecting portion 14 does not hinder the deformation of the first circumferential wall 10, so that the buckle portion 200 is convenient for being inserted into the slide groove 13. In this embodiment, the first circumferential wall 10 is separated into four sections by four notches 100, and the four notches 100 correspond to the four connecting portions 14. The four notches 100 and the four connecting portions 14 are evenly distributed on the circumference around the rotation axis of the knob 2, and the connecting portion 14 is completely staggered from the first circumferential wall 10 in the circumferential direction around the rotation axis of the knob 2.

[0039] The outer port 11 is provided with an annular edge 110, the first portion 140 is integrally connected to the annular edge 110, the first portion 140 extends from the annular edge 110 to the side where the substrate 12 is located, the annular edge 110 surrounds the knob 2, the first circumferential wall 10 extends from the annular edge 110 to the side where the substrate 12 is located, the connecting portion 14 is connected between the substrate 12 and the annular edge 110, and the knob 2 is further provided with an annular brim 210 corresponding to the annular edge 110, and the annular brim 210 is located on the circumferential outer side of the knob 2. The annular brim 210 can press the annular edge 110 toward the side where the substrate 12 is located. For example, when the user presses the knob 2 toward the side where the substrate 12 is located, the annular brim 210 will press against the annular edge 110 to prevent the knob 2 from being excessively pushed inward by the user, thereby preventing the substrate 12 and the components inside the substrate 12 from being crushed; the buckle portion 200 and the annular brim 210 are located on opposite sides of the first circumferential wall 10. Based on the existence of the annular brim 210 and the buckle portion 200, the knob 2 is effectively limited in the axial direction. The knob 2 is also provided with an end cap 21, which is partially located in the outer port 11. The end cap 21 includes a screwing portion 211 located on the outside thereof. The annular brim 210 is a part of the end cap 21, and the user can turn the knob 2 through the screwing portion 211.

[0040] The substrate 12 is in the shape of a flat plate, the width of the notch 100 is greater than the width of the second portion 141, the projection of the second portion 141 along the rotation axis of the knob 2 does not overlap with the projection of the first circumferential wall 10 along the rotation axis of the knob 2, and the projection of the substrate 12 along the rotation axis of the knob 2 does not overlap with the projection of the first circumferential wall 10 along the rotation axis of the knob 2, so that the first circumferential wall 10 does not hinder the demoulding of the second portion 141 and the substrate 12. The projection along the rotation axis of the knob 2 is the projection obtained when the projection direction is parallel to the rotation axis of the knob 2. The projection of the second portion 141 along the rotation axis of the knob 2 to the outer port 11 falls into the outer port 11, and the projection of the substrate 12 along the rotation axis of the knob 2 to the outer port 11 falls into the outer port 11.

[0041] The knob 2 is an integrally formed one-piece part. The knob 2 is also provided with an elastic arm 20, a second circumferential wall 22, and a sleeve portion 23. The buckle portion 200 is a part of the elastic arm 20. The second circumferential wall 22 is nested with the first circumferential wall 10. The first circumferential wall 10 is located at the periphery of the second circumferential wall 22. The second circumferential wall 22 is located at the outer periphery of the knob 2. The second circumferential wall 22 is circular as a whole. The second circumferential wall 22 is provided with a notch 220. The elastic arm 20 is located in the notch 220. The buckle portion 200 is located at the end of the elastic arm 20 away from the outer port 11. An elastic arm 20 is respectively provided on opposite sides of the knob 2 in the radial direction. The second circumferential wall 22 and its elastic arm 20 extend from the end cap 21 to the side where the substrate 12 is located.

[0042] When the knob 2 rotates relative to the recessed portion 1, the gear shaft 30 is driven to rotate. One end of the gear shaft 30 passes through the base plate 12 and is limited in the knob 2. The rotation of the gear shaft 30 is used to realize the switch control of the electrical appliance (such as a fan) and / or the control of the gear size. One end of the gear shaft 30 is inserted into the sleeve portion 23, and a first flat position 230 is provided in the sleeve portion 23. One end of the gear shaft 30 is provided with a second flat position 300 corresponding to the first flat position 230. Based on the matching of the first flat position 230 and the second flat position 300, the sleeve portion 23 and the gear shaft 30 can be effectively combined together, and the knob 2 drives the gear shaft 30 to rotate through the sleeve portion 23. The gear shaft 30 is perpendicular to the substrate 12 . The substrate 12 is provided with a through hole 120 . The gear shaft 30 passes through the substrate 12 through the through hole 120 . The substrate 12 is in a circular plate shape. The through hole 120 is located at the center of the substrate 12 . The rotation axis of the knob 2 is perpendicular to the substrate 12 , and the rotation axis of the knob 2 passes through the through hole 120 .

[0043] The recessed portion 1 is also provided with at least one stop portion for preventing the knob 2 from rotating. The at least one stop portion is provided on the side of the substrate 12 facing the external port 11. The at least one stop portion is integrally connected to and protrudes from the substrate 12. The arrangement of the stop portion on the substrate 12 is not easily restricted, and the reasonable layout of the stop portion can be relatively free.

[0044] The at least one stopper includes a first stopper 150, a second stopper 151, and a third stopper 152, the first stopper 150, the second stopper 151, and the third stopper 152 are respectively arranged on one side of the substrate 12 facing the external port 11, the first stopper 150, the second stopper 151, and the third stopper 152 are respectively integrally connected to and protrude from the substrate 12, the first stopper 150, the second stopper 151, and the third stopper 152 respectively extend outward from the substrate 12, more specifically, the first stopper 150, the second stopper 151, and the third stopper 152 respectively extend from the substrate 12 to the external port 11, and the knob 2 is limited to a first angular position. More specifically, the rotation angle of the knob 2 is limited between the first angular position and the third angular position by the first stop portion 150 and the third stop portion 152; the knob 2 is also provided with a first interference portion 240 and a second interference portion 241, which extend toward the substrate 12 respectively; when the knob 2 rotates to the first angular position, the first interference portion 240 is stopped by the first stop portion 150, and when the knob 2 rotates to the third angular position, the second interference portion 241 is stopped by the third stop portion 152, so that the rotation angle of the knob 2 is limited between the first angular position and the third angular position.

[0045] The first stopper 150 and the second stopper 151 are opposite to each other in the circumferential direction of the rotation axis of the knob 2, the first stopper 150 and the third stopper 152 are completely staggered in the circumferential direction of the rotation axis of the knob 2, and the second stopper 151 and the third stopper 152 are completely staggered in the circumferential direction of the rotation axis of the knob 2; the first interference portion 240 and the first stopper 150 at least partially overlap in the circumferential direction of the rotation axis of the knob 2, so that the first stopper 150 can be used to stop the first interference portion 240; the first interference portion 240 and the second stopper 150 overlap each other in the circumferential direction of the rotation axis of the knob 2. The portion 151 at least partially overlaps in the circumferential direction around the rotation axis of the knob 2, so that the second stop portion 151 can be used to stop the first interference portion 240; the second interference portion 241 and the third stop portion 152 at least partially overlap in the circumferential direction around the rotation axis of the knob 2, so that the third stop portion 152 can be used to stop the second interference portion 241; the first interference portion 240 and the third stop portion 152 are completely staggered in the circumferential direction around the rotation axis of the knob 2, so that the first interference portion 240 will not be stopped by the third stop portion 152 during the rotation of the knob 2.

[0046] The recessed portion 1 is also provided with a connecting rib 153, which connects the first stop portion 150 with the second stop portion 151 to enhance the structural stability of the first stop portion 150 and the second stop portion 151; the knob 2 is also provided with a semi-annular rib 25, which extends toward the substrate 12; the second interference portion 241 is integrally connected to the radial outer side of the semi-annular rib 25, the first interference portion 240, the second interference portion 241, and the semi-annular rib 25 extend from the end cap 21 to the substrate 12 respectively, and the first stop portion 150, the second stop portion 151, and the third stop portion 152 extend from the substrate 12 toward the end cap 21 respectively.

[0047] According to different application requirements, the gear knob device can also use a knob 2' (such as Fig.11 , Fig.12 , Fig.13 As shown), knob 2' and Figure 6 , Figure 7 , Fig.10 The difference of the knob 2 shown is only that: the knob 2' is not provided with the second interference portion 241, and the knob 2' is the knob 2 after the second interference portion 241 is removed; since the knob 2' does not have the second interference portion 241, the knob 2' will not be blocked at the third angle position by the third stop portion 152. In this case, the rotation angle range of the knob 2' is increased (relative to the knob 2); the knob 2' (i.e., the knob 2 without the second interference portion 241) is limited to rotate between the first angle position and the second angle position, and the knob 2' (i.e., the knob 2 without the second interference portion 241) passes through the third angle position during the rotation from the first angle position to the second angle position; when the knob 2' rotates to the first angle position, the first interference portion 240 is stopped by the first stop portion 150; after the knob 2' rotates from the first angle position to the third angle position, it can continue to rotate until the second angle position, and when the knob 2' rotates to the second angle position, the first interference portion 240 is stopped by the second stop portion 151. If the knob 2 does not have the second interference portion 241, the knob 2 will not be blocked at the third angular position by the third stop portion 152. That is to say, if the second interference portion 241 is removed from the knob 2, the knob 2 is limited to rotating between the first angular position and the second angular position and the knob 2 can continue to rotate from the first angular position to the third angular position until the second angular position, and the first interference portion 240 is stopped by the second stop portion 151 when the knob 2 rotates to the second angular position.

[0048] The knobs 2, 2' and the recessed portion 1 are respectively injection molded, and the knobs 2, 2' are installed in the recessed portion 1 from the external port 11. When installing, the knobs 2, 2' are pushed toward the substrate 12 to make the buckle portion 200 embed into the slide groove 13; the difference between the first angular position and the third angular position is about 90 degrees, that is, the knobs 2, 2' can reach the third angular position by rotating about 90 degrees from the first angular position; the difference between the first angular position and the second angular position is about 280 degrees, that is, the knobs 2, 2' can reach the second angular position by rotating about 280 degrees from the first angular position.

[0049] When developing a gear knob device, a technician in this field can produce two gear knob devices with different rotation angle ranges (using the same recessed portion 1, and using knob 2 and knob 2' respectively) based solely on the presence or absence of the second interference portion 241 or whether it is removed, so as to be applied to different models of electrical appliances. The difference between the molds of the two gear knob devices may only be in the portion corresponding to the second interference portion 241, so the difference is very small, which improves the versatility of the structural design and mold design of the gear knob device and reduces the product development and manufacturing costs.

[0050] Key points Figures 1 to 3 As shown, the fan also includes a motor 40, a fan blade 41 driven by the motor 40, a rear mesh cover 42, a front mesh cover 43, a cylinder ring 44, a support frame 45, a handle 46, a wheel 47, the aforementioned gear shaft 30, and an outer cover shell 48 exposed to the outside of the fan. The outer cover shell 48 is an integrally formed one-piece part, the recessed portion 1 is a part of the outer cover shell 48, the outer cover shell 48 covers the rear side of the motor 40, the motor 40 is located between the fan blades 41 and the outer cover shell 48, and the fan blades 41 are located between the rear mesh cover 42 and the front mesh cover 43; when the fan is working, air is discharged forward from the front mesh cover 43; the rated power of the motor 40 is between 10w and 1000w, and can be selected between 20w and 500w, such as 40w, 50w, 70w, 95w, 125w, 150w; the fan blades 41 are located on the front side of the motor 40, the recessed portion 1 is recessed toward the fan blades 41, and the rear mesh cover 42 is recessed toward the fan blades 41 to form a recessed space 420, the outer cover shell 48 is accommodated in the recessed space 420, the cylinder ring 44 surrounds the fan blades 41 and the motor 40, the rear mesh cover 42 and the front mesh cover 43 are respectively disc-shaped, the outer periphery of the rear mesh cover 42 is fixed to the rear side of the cylinder ring 44, the rear mesh cover 42 covers the rear side of the cylinder ring 44, the outer periphery of the front mesh cover 43 is fixed to the front side of the cylinder ring 44, and the front mesh cover 43 covers the front side of the cylinder ring 44; the support frame 45 is U-shaped as a whole, and the support frame 45 is formed with two upward support arms 450, the aforementioned two support arms 450 are connected to the opposite sides of the cylinder ring 44, the handle 46 is located on the upper side of the cylinder ring 44 and is connected to the cylinder ring 44, and the wheel 47 is rotatably connected to the support frame 45.

Claims

1. A gear knob device, comprising a recessed portion and a knob, wherein the knob is at least partially received in the recessed portion and can rotate relative to the recessed portion, the recessed portion is provided with a first stop portion, a second stop portion, and a third stop portion, the knob is provided with a first interference portion and a second interference portion, the knob is limited to rotate between a first angular position and a third angular position, when the knob is rotated to the first angular position, the first interference portion is stopped by the first stop portion, and when the knob is rotated to the third angular position, the second interference portion is stopped by the third stop portion; the first interference portion and the first stop portion are at least partially in the circumferential direction around the rotation axis of the knob. The first interference portion and the second stop portion at least partially overlap in the circumferential direction around the rotation axis of the knob, the first interference portion and the third stop portion are completely staggered in the circumferential direction around the rotation axis of the knob, and the second interference portion and the third stop portion at least partially overlap in the circumferential direction around the rotation axis of the knob; if the second interference portion is removed from the knob, the knob is limited to rotating between a first angular position and a second angular position and the knob can continue to rotate from the first angular position to the third angular position until the second angular position, and the first interference portion is stopped by the second stop portion when the knob rotates to the second angular position.

2. The gear knob device according to claim 1, wherein: The recessed portion is also provided with a substrate and an external port, the substrate is opposite to the external port, the knob is installed to the recessed portion from the external port, the first stop portion, the second stop portion and the third stop portion are respectively integrally connected to and protrude from the substrate, and the first stop portion, the second stop portion and the third stop portion respectively extend from the substrate to the external port.

3. The gear knob device according to claim 1, wherein: If the second interference portion is removed from the knob, the first interference portion passes through the radially outer side of the third stop portion during the process of the knob rotating from the first angular position to the second angular position.

4. The gear knob device according to claim 3, wherein: The recessed portion is also provided with a substrate, which is provided with a through hole, through which the rotation axis of the knob passes. The knob is also provided with a semi-annular rib, which surrounds one side of the rotation axis of the knob and extends toward the substrate. The second interference portion is integrally connected to the radial outer side of the semi-annular rib.

5. The gear knob device according to claim 3, wherein: The first stop portion and the second stop portion are opposite to each other in the circumferential direction of the rotation axis of the knob, the first stop portion and the third stop portion are completely staggered in the circumferential direction of the rotation axis of the knob, and the second stop portion and the third stop portion are completely staggered in the circumferential direction of the rotation axis of the knob.

6. The gear knob device according to claim 1, wherein: The recessed portion is also provided with a base plate, a first circumferential wall, and an external port. The base plate is opposite to the external port. The first circumferential wall surrounds the rotation axis of the knob. A slide groove is formed between the base plate and the first circumferential wall. The knob is provided with a snap portion, and the snap portion is limited in the slide groove. As the knob rotates relative to the recessed portion, the snap portion rotates along the slide groove.

7. The gear knob device according to claim 6, wherein: The knob and the external port are located on the same side of the substrate, the external port and the slide groove are located on opposite sides of the first circumferential wall, and the interval between the edge of the first circumferential wall away from the external port and the substrate forms the slide groove.

8. The gear knob device according to claim 6, wherein: The first circumferential wall is provided with a notch, which at least separates the edge of the first circumferential wall away from the external port. The recessed portion also includes a connecting portion, which is connected between the substrate and the external port. The connecting portion is adjacent to the notch, and the buckle portion can pass between the notch and the connecting portion as the knob rotates.

9. The gear knob device according to claim 8, wherein: The connecting part includes a first part and a second part connected between the substrate and the first part. The first part is located radially outside the corresponding notch, and the notch is located between the outer port and the second part. As the knob rotates, the buckle part can pass between the notch and the second part of the connecting part.

10. The gear knob device according to claim 9, wherein: The outer port is provided with an annular edge, the annular edge surrounds the knob, the first circumferential wall extends from the annular edge to the side where the substrate is located, the first part is integrally connected to the annular edge, and the second part is integrally connected to the substrate.

11. The gear knob device according to claim 9, wherein: The first part is bent and connected to the second part, the second part extends radially outward from the outer periphery of the substrate, the projection of the second part along the knob rotation axis does not overlap with the projection of the first circumferential wall along the knob rotation axis, and the projection of the substrate along the knob rotation axis does not overlap with the projection of the first circumferential wall along the knob rotation axis.

12. The gear knob device according to claim 6, wherein: The outer periphery of the substrate is circular, the outer diameter of the substrate is smaller than the inner diameter of the first circumferential wall, and the interval between the edge of the first circumferential wall away from the outer port and the outer periphery of the substrate forms the slide groove.

13. The gear knob device according to claim 1, wherein: The recessed portion is also provided with a base plate, the knob can rotate relative to the recessed portion to drive a gear shaft to rotate, the base plate is provided with a through hole, the gear shaft passes through the base plate through the through hole, and one end of the gear shaft is accommodated in the knob.

14. The gear knob device according to claim 6, wherein: The knob is also provided with a second circumferential wall and an elastic arm. The first circumferential wall is located outside the second circumferential wall. The second circumferential wall is provided with a notch. The elastic arm is located in the notch. The buckle portion is part of the elastic arm and is located at an end of the elastic arm away from the external port.

15. A fan, comprising the gear knob device according to any one of claims 1-14.

16. The fan according to claim 15, further comprises a motor, fan blades driven by the motor, an outer cover shell exposed to the outside of the fan, a rear mesh cover, and a front mesh cover, wherein the fan blades are located between the rear mesh cover and the front mesh cover, the outer cover shell is an integrally formed one-piece part, the recessed portion is a part of the outer cover shell, the motor is located between the fan blades and the outer cover shell, the outer cover shell covers the rear side of the motor, the rear mesh cover is recessed toward the fan blades to form a recessed space, and the outer cover shell is accommodated in the recessed space.

17. The fan according to claim 15, further comprising a motor and fan blades driven by the motor, wherein the rated power of the motor is between 10W and 1000W.

Images