Knob assembly and household appliance

Abstract

The utility model discloses a rotary knob assembly and a household electrical appliance, and the rotary knob assembly comprises a rotating shaft, a gear part connected with the rotating shaft, an elastic telescoping convex block which is used for being in embedded connection with the gear part in the radial direction, an elastic sheet assembly which is in driving connection with the rotating shaft, and a plurality of fixed contacts which are used for abutting against the elastic sheet assembly. According to the application, the elastic telescopic convex block is in radial embedded connection with the gear piece, and when the rotating shaft is rotated to switch gears, the elastic telescopic convex block is pressed to be in contact with the gear piece, so that certain pressure is kept between the elastic telescopic convex block and the gear piece, the rotating force during rotation is increased, and the use experience feeling is improved.

Description

Technical Field

[0001] The present application relates to the field of electrical appliance technology, and more specifically, to a knob assembly and a household appliance. Background Art

[0002] Household electrical appliances usually use electrical components, and corresponding knobs are used to select the working gear of these electrical components.

[0003] For example, a microwave oven is provided with a knob for the user to operate. However, the rotating shaft is usually provided with a buckle structure. When the gear needs to be switched, the rotating shaft is rotated and made to rotate along the buckle. Long-term use can easily cause the buckle to wear and loosen, which in turn leads to too small a torque force required for rotation, resulting in a poor user experience.

[0004] Therefore, the prior art needs to be improved. Utility Model Content

[0005] The purpose of the present application is to provide a knob assembly and a household appliance, aiming to solve the technical problem in the prior art that the torque force required when the knob is rotated is too small, resulting in a poor user experience.

[0006] To achieve the above purpose, the technical solution adopted in this application is:

[0007] In a first aspect, the present application provides a knob assembly, comprising:

[0008] Axis of rotation;

[0009] A gear member connected to the rotating shaft;

[0010] An elastic telescopic projection for radially engaging with the gear member;

[0011] A shrapnel assembly drivingly connected to the rotating shaft;

[0012] A plurality of fixed contacts for abutting against the spring assembly.

[0013] Through the above scheme, this embodiment radially embeds the elastic telescopic protrusion with the gear part. When the rotating shaft is rotated to switch gears, the elastic telescopic protrusion is pressed and contacts the gear part, so that a certain pressure is maintained between the elastic telescopic protrusion and the gear part to increase the rotational force during rotation and improve the user experience. On the other hand, the elastic telescopic protrusion shrinks under pressure, which can avoid hard interference between the elastic telescopic protrusion and the gear part, reduce the wear between the elastic telescopic protrusion and the gear part, and extend the service life of the elastic telescopic protrusion and the gear part.

[0014] In one embodiment, the elastic telescopic protrusion includes:

[0015] A sliding protrusion, the sliding protrusion is used for radially engaging with the gear member;

[0016] The first spring is connected to the sliding protrusion, and the sliding protrusion slides toward one side of the gear part by means of the elastic force of the first spring.

[0017] Through the above scheme, when the rotating shaft is rotated, the rotating shaft causes the gear part to rotate, and when the tooth top of the gear part contacts the sliding protrusion, the sliding protrusion is compressed to cause the first spring to contract. When the tooth top is disengaged from the sliding protrusion, the first spring generates elastic force due to compression, so that the first spring pushes the sliding protrusion to move toward the tooth root of the gear part and makes the sliding protrusion abut against the tooth root. As a result, the sliding protrusion can be telescopically moved through the first spring, so that during the rotation of the rotating shaft, the sliding protrusion can abut against the gear part and maintain a certain pressure, so as to increase the rotational force during rotation and improve the user experience.

[0018] In one embodiment, the gear member comprises:

[0019] A first connecting portion, the first connecting portion is used to connect with the rotating shaft;

[0020] A gear portion, the gear portion is connected to the first connecting portion, and the gear portion is used to be radially engaged with the elastic telescopic protrusion;

[0021] The second connecting portion is connected to a side of the gear portion away from the first connecting portion, and is used to connect with the spring assembly.

[0022] Through the above scheme, on the one hand, the gear part is connected to the rotating shaft through the first connecting part, and on the other hand, the gear part is connected to the spring assembly through the second connecting part. Therefore, when the rotating shaft is rotated, the gear part rotates together with the rotating shaft, wherein the gear part has a plurality of tooth grooves, and each time a tooth groove is rotated, the spring assembly switches a fixed contact, and the tooth groove can correspond to the gear position to realize the switching of different gear positions by rotating the rotating shaft under a certain pressure.

[0023] In one embodiment, the first connecting portion comprises:

[0024] A first connecting shaft, the first connecting shaft is connected to the gear part;

[0025] The first retaining groove is arranged on the first connecting shaft and is used for matching and connecting with the rotating shaft.

[0026] Through the above solution, the rotating shaft is inserted into the first locking groove of the first connecting shaft to achieve the connection between the rotating shaft and the gear part, ensuring that the rotating shaft can drive the gear part to rotate, with a simple structure and stable transmission.

[0027] In one embodiment, the first connecting portion further includes:

[0028] A boss, the boss being arranged in the first locking groove;

[0029] The second spring is sleeved on the convex column, one end of the second spring is in contact with the first locking groove, and the other end is in contact with the rotating shaft. The second spring is used to drive the rotating shaft to move.

[0030] Through the above scheme, the first locking groove is provided with a convex column, the second spring is sleeved on the convex column, and the second spring is in contact with the rotating shaft, pressing the rotating shaft to compress the second spring, and releasing the rotating shaft, the rotating shaft is automatically reset by the elastic force of the second spring. When the second spring is compressed, the rotating shaft can rotate, and when the rotating shaft automatically resets, the rotating shaft can be in a locked state.

[0031] In one embodiment, the second connecting portion comprises:

[0032] a second connecting shaft connected to a side of the gear portion away from the first connecting portion;

[0033] A first clamping surface, the first clamping surface is arranged on the second connecting shaft, and the first clamping surface is used for clamping with the spring assembly;

[0034] The third connecting shaft is connected to a side of the second connecting shaft away from the gear portion.

[0035] Through the above scheme, the first connecting shaft and the second connecting shaft are respectively located at the two ends of the gear part to realize the rotation of the gear part, which can ensure the stable movement of the gear part. The first clamping surface is connected to the spring assembly. When the gear part rotates, the first clamping surface drives the spring assembly to rotate, thereby ensuring the stability of the transmission of the second connecting shaft.

[0036] In one embodiment, the rotating shaft comprises:

[0037] Axis body;

[0038] A second clamping surface, the second clamping surface is arranged on the rotating shaft body, and the second clamping surface is used for clamping with the gear member;

[0039] A first cavity, which is disposed on a side of the shaft body close to the second clamping surface, and is used to connect with the second spring of the gear member;

[0040] A first stop key, which is arranged on the rotating shaft body and is used to stop the rotating shaft body from rotating;

[0041] The third clamping surface is arranged on the rotating shaft body, and the third clamping surface is used to drive the rotating shaft body to rotate.

[0042] Through the above scheme, the shaft body is clamped with the first locking groove through the second clamping surface, the rotating shaft is pressed, the shaft body abuts against the second spring through the first cavity, the second spring is compressed, the shaft body drives the first stop key to descend, the first stop key is in an active state, and then the rotating shaft is rotated, so that the rotating shaft drives the gear part to rotate, and the third clamping surface is used to drive the shaft body to rotate, so as to ensure the stability of the rotating shaft transmission and ensure the safety of the knob assembly.

[0043] In one embodiment, the rotating shaft further comprises:

[0044] A first protruding rod, which is disposed on the rotating shaft body and extends outward from the rotating shaft body;

[0045] A return spring is used to abut against the first protruding rod, and the shaft body is rotated by means of the elastic force of the return spring.

[0046] Through the above scheme, the rotating shaft is rotated so that the rotating shaft abuts against the reset spring through the first protruding rod, and the rotating shaft continues to rotate. Thereafter, the rotating shaft is released and the rotating shaft rotates back due to the elastic force of the reset spring. If the knob assembly is rotated from the Nth gear to the N+1th gear, the N+1th gear is triggered. At this time, the reset spring is in a compressed state. When the rotating shaft is released, the reset spring drives the rotating shaft to automatically reset to the Nth gear due to the elastic force. The automatic reset of the rotating shaft can be realized, which is simple to operate and highly practical.

[0047] In one embodiment, the spring assembly comprises:

[0048] A first fixing seat;

[0049] A second retaining groove, which is arranged on a side of the first fixing seat close to the gear member, and is used for retaining the gear member;

[0050] A first fixing portion, the first fixing portion is arranged on a side of the first fixing seat away from the gear member;

[0051] A metal spring sheet, one end of which is fixed to the first fixing portion, and the other end of which is used to contact the fixed contact.

[0052] The knob assembly also includes a housing, which includes:

[0053] A first base, wherein a middle partition is provided in the middle of the first base;

[0054] A printed circuit board, the printed circuit board is connected to the first base, and fixed contacts are arranged on the printed circuit board, and a plurality of fixed contacts are arranged in a circular distribution;

[0055] A first cover plate, the first cover plate is connected to the first base, and the first cover plate is located on a side of the middle partition away from the printed circuit board;

[0056] A second cover plate, the second cover plate is connected to the first base, and the second cover plate is located on a side of the first cover plate away from the middle partition plate;

[0057] The first connecting portion of the gear member is rotatably connected to the first cover plate, the gear portion of the gear member is located between the first cover plate and the middle partition plate, a slide rail is provided on the side of the middle partition plate close to the first cover plate, the slide rail is used to be slidably connected with the elastic telescopic protrusion, the second connecting portion of the gear member passes through the middle partition plate and extends to one side of the printed circuit board, the spring assembly is connected to the second connecting portion, and a fixed contact matched with the spring assembly is provided on the printed circuit board;

[0058] The rotating shaft passes through the second cover plate and is clamped with the first connecting portion. The second cover plate is provided with a limiting groove, and the limiting groove is used to be connected with the first stop key of the rotating shaft;

[0059] The return spring of the rotating shaft is arranged on a side of the first cover plate close to the second cover plate, and the return spring is used for contacting with the first protruding rod of the rotating shaft.

[0060] Through the above scheme, the first fixed seat is clamped with the second clamping surface through the second clamping groove, thereby ensuring the stability of the transmission between the first fixed seat and the gear part. The metal spring is fixed to the first fixed seat through the first fixing part, which can facilitate the disassembly and assembly of the metal spring. When the rotating shaft drives the metal spring to rotate, the first fixing part can ensure the stability of the transmission of the metal spring.

[0061] In a second aspect, the present application provides a household appliance, wherein the household appliance includes the knob assembly as described in the above embodiment, so that the household appliance can have all the features and effects of the above knob assembly, which will not be repeated.

[0062] The beneficial effects of a knob assembly and a household appliance provided by the present application are at least:

[0063] The present application discloses a knob assembly and a household appliance, wherein the knob assembly comprises a rotating shaft, a gear part connected to the rotating shaft, an elastic telescopic projection for radially engaging with the gear part, a spring assembly drivingly connected to the rotating shaft, and a plurality of fixed contacts for abutting against the spring assembly. The present application radially engages the gear part with the elastic telescopic projection, and when the rotating shaft is rotated to switch gears, the elastic telescopic projection is pressed and contacts with the gear part, so that a certain pressure is maintained between the elastic telescopic projection and the gear part, so as to increase the rotational force during rotation and improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0065] Figure 1 A three-dimensional diagram of a knob assembly provided in an embodiment of the present application;

[0066] Figure 2 An exploded view of a knob assembly provided in an embodiment of the present application;

[0067] Figure 3 A schematic cross-sectional structure diagram of a knob assembly provided in an embodiment of the present application;

[0068] Figure 4 A schematic diagram of the assembly structure of a gear member provided in an embodiment of the present application;

[0069] Figure 5 A schematic diagram of the structure of the sliding protrusion provided in an embodiment of the present application;

[0070] Figure 6 A schematic diagram of the structure of a gear member provided in an embodiment of the present application;

[0071] Figure 7 A schematic diagram of the structure of a rotating shaft provided in an embodiment of the present application;

[0072] Figure 8 A schematic diagram of the structure of a spring assembly provided in an embodiment of the present application;

[0073] Fig. 9 A schematic diagram of the structure of the first fixing seat in the spring assembly provided in an embodiment of the present application.

[0074] Among them, the reference numerals in the figure are:

[0075] 100, rotating shaft; 200, gear member; 300, elastic telescopic convex block; 400, spring assembly; 500, fixed contact; 600, housing; 110, rotating shaft body; 120, second clamping surface; 130, first cavity; 140, first stop key; 150, third clamping surface; 160, first convex rod; 170, return spring; 141, first stop plate; 210, first connecting part; 220, gear part; 230, second connecting part; 211, first connecting shaft; 212, first clamping groove; 213, convex column; 214, first Two springs; 231, second connecting shaft; 232, first clamping surface; 233, third connecting shaft; 310, sliding protrusion; 320, first spring; 311, protrusion body; 312, arc-shaped abutment portion; 313, spring accommodating cavity; 314, wing plate; 410, first fixing seat; 420, second clamping groove; 430, first fixing portion; 440, metal spring sheet; 610, first base; 620, printed circuit board; 630, first cover plate; 640, second cover plate; 650, middle partition plate; 631, slide rail; 641, limiting groove. DETAILED DESCRIPTION

[0076] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying 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.

[0077] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly or indirectly located on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and cannot be understood as limitations on the present technical solution. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0078] See also Figure 1 and Figure 2The present embodiment provides a knob assembly, which includes: a rotating shaft 100, a gear part 200, an elastic telescopic protrusion 300, a spring assembly 400 and a plurality of fixed contacts 500; the gear part 200 is connected to the rotating shaft 100; the elastic telescopic protrusion 300 is used to radially engage with the gear part 200; the spring assembly 400 is drivingly connected to the rotating shaft 100; and a plurality of fixed contacts 500 are used to abut against the spring assembly 400.

[0079] In this embodiment, the knob assembly can be used for a knob switch of an electric ceramic or induction cooker. By rotating the knob assembly, the gear position of the knob assembly can be switched. The inventor has found through research that in the prior art, relative to the existing knob assembly, the rotating shaft 100 is usually provided with a buckle structure. When the gear position needs to be switched, the rotating shaft 100 is rotated and the rotating shaft 100 is rotated along the buckle. Long-term use can easily cause the buckle to wear and loosen, which in turn causes the required torsional force to be too small during rotation, resulting in a poor user experience.

[0080] In order to solve the above problem, in this embodiment, the rotating shaft 100 can drive the spring assembly 400 to rotate, and the spring assembly 400 can contact with a plurality of fixed contacts 500 by rotating. For example, N fixed contacts 500 can be provided, and the fixed contacts 500 can be electrically connected to the connector main board. When the spring assembly 400 contacts the first fixed contact 500, the first gear is triggered. By providing a gear part 200 and an elastic telescopic protrusion 300, the elastic telescopic protrusion 300 is radially embedded with the gear part 200, and the gear part 200 is connected to the rotating shaft 100. When the rotating shaft 100 is rotated to switch the gear position, the rotating shaft 100 can drive the gear part 200 to rotate. The gear part 200 has a tooth groove and a tooth top. When rotating a gear position, the gear part 200 sequentially contacts the elastic telescopic protrusion 300 through the tooth groove, the tooth top, and the next tooth groove. In the process from the tooth groove to the tooth top, the elastic telescopic protrusion 300 is compressed and shrinks itself. In the process from the tooth top to the next tooth groove, the elastic telescopic protrusion 300 generates elastic force due to pressure. Since the elastic force drives the elastic telescopic protrusion 300 to move to the side of the next tooth groove, a certain pressure can be maintained between the gear part 200 and the elastic telescopic protrusion 300 during the rotation process, which can improve the rotational force during rotation and improve the rotation feel.

[0081] Therefore, in this embodiment, the elastic telescopic protrusion 300 is radially embedded with the gear part 200. When the rotating shaft 100 is rotated to switch gears, the elastic telescopic protrusion 300 is compressed and contacts with the gear part 200, so that a certain pressure is maintained between the elastic telescopic protrusion 300 and the gear part 200 to increase the rotational force during rotation and improve the user experience. On the other hand, the elastic telescopic protrusion 300 is compressed and shrinks, which can avoid hard interference between the elastic telescopic protrusion 300 and the gear part 200, reduce the wear between the elastic telescopic protrusion 300 and the gear part 200, and extend the service life of the elastic telescopic protrusion 300 and the gear part 200.

[0082] Specifically, see Figure 2 A knob assembly may include a rotating shaft 100, a gear member 200, an elastic telescopic protrusion 300, a spring assembly 400, a plurality of fixed contacts 500 and a housing 600. The housing 600 may include: a first base 610, a printed circuit board 620 (PCBA), a first cover 630 and a second cover 640. The first base 610 has a middle partition 650 in the middle, the printed circuit board 620 is connected to the first base 610, and the printed circuit board 620 is provided with fixed contacts 500, and the plurality of fixed contacts 500 are arranged in a circular distribution. The first cover 630 is connected to the first base 610, and the first cover 630 is located on the side of the middle partition 650 away from the printed circuit board 620. The second cover 640 is connected to the first base 610, and the second cover 640 is located on the side of the first cover 630 away from the middle partition 650.

[0083] The rotating shaft 100 passes through the second cover plate 640 and is engaged with the gear member 200. One side of the gear member 200 is rotatably arranged on the first cover plate 630. The middle part of the gear member 200 is rotatably connected to the intermediate partition plate 650. The other side of the gear member 200 passes through the intermediate partition plate 650 and extends toward the printed circuit board 620. The spring assembly 400 is connected to the side of the gear member 200 close to the printed circuit board 620. A plurality of fixed contacts 500 are arranged on the printed circuit board 620. The intermediate partition plate 650 is arranged on the side close to the first cover plate 630. The slide rail 631 is used to be slidably connected to the elastic telescopic protrusion 300. In this embodiment, the spring assembly 400, the fixed contact 500 and the printed circuit board 620 (PCBA) are connected to form a potentiometer, wherein the resistance of each fixed contact 500 can be different, and the printed circuit board 620 (PCBA) can be connected to the main board through a 3-pin connector. Thus, the main board provides different printed circuit board 620 (PCBA) voltages, thereby obtaining different current signals, thereby realizing the functions of different gears of the knob.

[0084] Specifically, see Figure 2The elastic telescopic protrusion 300 includes: a sliding protrusion 310 and a first spring 320. The sliding protrusion 310 is used to radially engage with the gear member 200. The first spring 320 is connected to the sliding protrusion 310. With the help of the elastic force of the first spring 320, the sliding protrusion 310 slides toward the side of the gear member 200.

[0085] In this example, see Figure 3 and Figure 4 When the rotating shaft 100 is rotated, the rotating shaft 100 causes the gear part 200 to rotate. When the tooth top of the gear part 200 contacts the sliding protrusion 310, the sliding protrusion 310 is compressed to cause the first spring 320 to contract. When the tooth top is separated from the sliding protrusion 310, the first spring 320 generates elastic force due to compression, so that the first spring 320 pushes the sliding protrusion 310 toward the tooth root of the gear part 200 and makes the sliding protrusion 310 abut against the tooth root. As a result, the sliding protrusion 310 can be telescopically moved through the first spring 320, so that during the rotation of the rotating shaft 100, the sliding protrusion 310 can abut against the gear part 200 and maintain a certain pressure, so as to increase the rotational force during rotation and improve the user experience.

[0086] Specifically, see Figure 5 The sliding protrusion 310 includes: a protrusion body 311, an arcuate abutment portion 312 and a spring accommodating cavity 313. The protrusion body 311 is provided with a spring accommodating cavity 313. The protrusion body 311 is connected to the first spring 320 through the spring accommodating cavity 313, so that a part of the first spring 320 can be contracted in the spring accommodating cavity 313, which can save the space occupied by the first spring 320 and ensure the stability of the first spring 320 driving the sliding protrusion 310 to move. The protrusion body 311 is provided with an arcuate abutment portion 312 on the side close to the gear part 200. The protrusion body 311 is matched and connected with the gear part 220 through the arcuate abutment portion 312 to ensure that the arcuate abutment portion 312 can stop the gear part 220 under the action of no rotational force. Under the action of a certain rotational force, the arcuate abutment portion 312 can switch and move in each tooth groove. Wing plates 314 may also be provided on both side edges of the protrusion body 311 , and the wing plates 314 can facilitate quick disassembly of the sliding protrusion 310 . If the sliding protrusion 310 needs to be removed from the track, the wing plates 314 on both sides may be clamped to remove the sliding protrusion 310 .

[0087] Specifically, see Figure 6The gear member 200 includes: a first connecting portion 210, a gear portion 220 and a second connecting portion 230. The first connecting portion 210 is used to connect with the rotating shaft 100. The gear portion 220 is connected to the first connecting portion 210. The gear portion 220 is used to radially engage with the elastic telescopic protrusion 300. The second connecting portion 230 is connected to a side of the gear portion 220 away from the first connecting portion 210. The second connecting portion 230 is used to connect with the spring assembly 400.

[0088] In this embodiment, on the one hand, the gear portion 220 is connected to the rotating shaft 100 through the first connecting portion 210, and on the other hand, the gear portion 220 is connected to the spring assembly 400 through the second connecting portion 230. Therefore, when the rotating shaft 100 is rotated, the gear portion 220 rotates together with the rotating shaft 100, wherein the gear portion 220 has a plurality of tooth grooves, and each time a tooth groove is rotated, the spring assembly 400 switches a fixed contact 500, and the tooth groove can correspond to the gear position to realize the switching of different gear positions by rotating the rotating shaft 100 under a certain pressure.

[0089] Specifically, the first connecting portion 210 includes: a first connecting shaft 211 and a first retaining groove 212 . The first connecting shaft 211 is connected to the gear portion 220 . The first retaining groove 212 is opened on the first connecting shaft 211 . The first retaining groove 212 is used to cooperate with the rotating shaft 100 .

[0090] In this embodiment, the rotating shaft 100 is inserted into the first locking groove 212 of the first connecting shaft 211 to achieve the connection between the rotating shaft 100 and the gear part 220, ensuring that the rotating shaft 100 can drive the gear part 220 to rotate, with a simple structure and stable transmission.

[0091] Specifically, see Figure 3 The first connecting portion 210 may further include: a boss 213 and a second spring 214, the boss 213 is arranged in the first locking groove 212, the second spring 214 is sleeved on the boss 213, one end of the second spring 214 abuts against the first locking groove 212, and the other end abuts against the rotating shaft 100, and the second spring 214 is used to drive the rotating shaft 100 to move.

[0092] In this embodiment, the first locking groove 212 is provided with a boss 213, and the second spring 214 is sleeved on the boss 213, and the second spring 214 is in contact with the rotating shaft 100, pressing the rotating shaft 100 to compress the second spring 214, and releasing the rotating shaft 100, the rotating shaft 100 is automatically reset by the elastic force of the second spring 214, and when the second spring 214 is compressed, the rotating shaft 100 can rotate, and when the rotating shaft 100 is automatically reset, the rotating shaft 100 can be in a locked state.

[0093] Specifically, see Figure 6The second connecting part 230 includes: a second connecting shaft 231, a first clamping surface 232 and a third connecting shaft 233. The second connecting shaft 231 is connected to the side of the gear part 220 away from the first connecting part 210. The first clamping surface 232 is arranged on the second connecting shaft 231. The first clamping surface 232 is used to clamp with the spring assembly 400. The third connecting shaft 233 is connected to the side of the second connecting shaft 231 away from the gear part 220.

[0094] In this embodiment, the first connecting shaft 211 and the second connecting shaft 231 are respectively located at the two ends of the gear part 220 to realize the rotation of the gear part 220, which can ensure the stable movement of the gear part 220. The first clamping surface 232 is connected to the spring assembly 400. When the gear part 220 rotates, the first clamping surface 232 drives the spring assembly 400 to rotate, ensuring the stability of the transmission of the second connecting shaft 231.

[0095] Specifically, see Figure 7 The rotating shaft 100 includes: a rotating shaft body 110, a second clamping surface 120, a first cavity 130, a first stop key 140 and a third clamping surface 150. The second clamping surface 120 is arranged on the rotating shaft body 110, and the second clamping surface 120 is used to clamp with the gear member 200. The first cavity 130 is opened on the side of the rotating shaft body 110 close to the second clamping surface 120. The first cavity 130 is used to connect with the second spring 214 of the gear member 200. The first stop key 140 is arranged on the rotating shaft body 110, and the first stop key 140 is used to stop the rotating shaft body 110 from rotating. The third clamping surface 150 is arranged on the rotating shaft body 110, and the third clamping surface 150 is used to drive the rotating shaft body 110 to rotate.

[0096] In this embodiment, the shaft body 110 is engaged with the first locking groove 212 through the second locking surface 120, pressing the rotating shaft 100, and the shaft body 110 abuts against the second spring 214 through the first cavity 130. The second spring 214 is compressed, and the shaft body 110 drives the first stop key 140 to descend. The first stop key 140 is in an active state, and then the rotating shaft 100 is rotated, so that the rotating shaft 100 drives the gear part 200 to rotate, and the third locking surface 150 is used to drive the shaft body 110 to rotate, so as to ensure the stability of the transmission of the rotating shaft 100 and ensure the safety of the knob assembly.

[0097] Specifically, see Figure 3 and Figure 7The rotating shaft 100 further includes: a first stop plate 141, a first protruding rod 160 and a return spring 170. The first protruding rod 160 is disposed on the rotating shaft body 110 and extends outward from the rotating shaft body 110. The return spring 170 is used to abut against the first protruding rod 160, and the rotating shaft body 110 is rotated by the elastic force of the return spring 170. For example, the first stop plate 141 is disposed at the bottom of the first stop key 140, and the first protruding rod 160 can be disposed at the edge of the first stop plate 141, that is, the first protruding rod 160 can be formed by extending outward from the first stop plate 141. When the first stop key 140 is placed in the limiting groove 641, the first stop plate 141 can abut against the second cover plate 640.

[0098] In this embodiment, the rotating shaft 100 is rotated so that the rotating shaft 100 is in contact with the return spring 170 through the first protruding rod 160, and the rotating shaft 100 continues to rotate. Thereafter, the rotating shaft 100 is released, and the rotating shaft 100 rotates due to the elastic force of the return spring 170. If the knob assembly is rotated from the Nth gear to the N+1th gear, the N+1th gear is triggered. At this time, the return spring 170 is in a compressed state. When the rotating shaft 100 is released, the return spring 170 drives the rotating shaft 100 to automatically return to the Nth gear due to the elastic force, thereby realizing automatic return of the rotating shaft 100. The operation is simple and the practicability is strong.

[0099] Specifically, see Figure 8 and Fig. 9 The spring assembly 400 includes: a first fixing seat 410, a second locking groove 420, a first fixing portion 430 and a metal spring 440. The second locking groove 420 is arranged on the side of the first fixing seat 410 close to the gear part 200. The second locking groove 420 is used to engage with the gear part 200. The first fixing portion 430 is arranged on the side of the first fixing seat 410 away from the gear part 200. One end of the metal spring 440 is fixed to the first fixing portion 430, and the other end is used to contact with the fixed contact 500.

[0100] In this embodiment, the first fixed seat 410 is clamped with the second clamping surface 120 through the second clamping groove 420 to ensure the stability of the transmission between the first fixed seat 410 and the gear member 200. The metal spring 440 is fixed to the first fixed seat 410 through the first fixing portion 430, which can facilitate the disassembly and assembly of the metal spring 440. When the rotating shaft 100 drives the metal spring 440 to rotate, the first fixing portion 430 can ensure the stability of the transmission of the metal spring 440.

[0101] Specifically, see Figure 1 and Figure 3The first connecting portion 210 of the gear member 200 is rotatably connected to the first cover plate 630, the gear portion 220 of the gear member 200 is located between the first cover plate 630 and the middle partition plate 650, a slide rail 631 is provided on the side of the middle partition plate 650 close to the first cover plate 630, and the slide rail 631 is used for sliding connection with the elastic telescopic protrusion 300, the second connecting portion 230 of the gear member 200 passes through the middle partition plate 650 and extends to one side of the printed circuit board 620, the spring assembly 400 is connected to the second connecting portion 230, and a fixed contact 500 matched with the spring assembly 400 is provided on the printed circuit board 620.

[0102] The rotating shaft 100 passes through the second cover plate 640 and is engaged with the first connecting portion 210 . A limiting groove 641 is defined on the second cover plate 640 . The limiting groove 641 is used to be connected with the first stop key 140 of the rotating shaft 100 .

[0103] The return spring 170 of the rotating shaft 100 is disposed on a side of the first cover plate 630 close to the second cover plate 640 , and the return spring 170 is used to abut against the first protruding rod 160 of the rotating shaft 100 .

[0104] In this embodiment, when it is necessary to rotate the rotating shaft 100, the rotating shaft 100 is pressed, so that the second spring 214 on the rotating shaft 100 is compressed and contracts, and the first stop key 140 on the rotating shaft 100 descends along the limiting groove 641 of the second cover plate 640 until the first stop key 140 is disengaged from the limiting groove 641. Then, the rotating shaft 100 is rotated, and the rotating shaft 100 can drive the gear part 200 to rotate, and the elastic telescopic protrusion 300 is radially embedded in the gear part 200. When the gear part 220 rotates, the first spring 320 is compressed and applies pressure to the sliding protrusion 310, so that the sliding protrusion 310 is always in contact with the gear part 200, so that a certain pressure is maintained between the sliding protrusion 310 and the gear part 220.

[0105] Assume that the knob assembly has a total of N+1 gears, and the initial position of the return spring 170 is at the Nth gear, that is, when the rotating shaft 100 drives the first protruding rod 160 to the Nth gear, the return spring 170 is in a state of being free of force.

[0106] When the rotating shaft 100 is rotated, the first protruding rod 160 abuts against the return spring 170 until the rotating shaft 100 drives the metal spring 440 to rotate to the N+1th gear position, at which time the N+1th gear position is triggered. After that, the rotating shaft 100 is released, and the elastic force of the return spring 170 drives the rotating shaft 100 to automatically rotate to the Nth gear position.

[0107] Two gear trigger modes can be set at the Nth gear and the N+1th gear. The metal spring 440 stays at the Nth gear. At this time, the knob assembly can trigger the Nth gear and the N+1th gear to work at the same time. For example, at the N+1th gear, the metal spring 440 touches the fixed contact 500 of the N+1th gear to start the N+1th gear, and at the Nth gear, the metal spring 440 contacts the fixed contact 500 of the Nth gear, which can also start the Nth gear.

[0108] Embodiment 2:

[0109] The present application provides a household appliance, wherein the household appliance includes the knob assembly as described in the above embodiment, so that the household appliance can have all the features and effects of the above knob assembly, which will not be repeated.

[0110] Optionally, the household appliance may be a microwave oven, an induction cooker, an electric ceramic cooker, an electric oven, an electric fan, an electric refrigerator, etc., but is not limited thereto.

[0111] In summary, the present application discloses a knob assembly and a household appliance, wherein the knob assembly includes a rotating shaft, a gear part connected to the rotating shaft, an elastic telescopic protrusion for radially engaging with the gear part, a spring assembly drivingly connected to the rotating shaft, and a plurality of fixed contacts for abutting against the spring assembly. The present application radially engages the gear part with the elastic telescopic protrusion, and when the rotating shaft is rotated to switch gears, the elastic telescopic protrusion is pressed and contacts with the gear part, so that a certain pressure is maintained between the elastic telescopic protrusion and the gear part, so as to increase the rotational force during rotation and improve the user experience.

[0112] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A knob assembly, characterized in that: include: Axis of rotation; a gear member connected to the rotating shaft; An elastic telescopic projection for radially engaging with the gear member; A shrapnel assembly drivingly connected to the rotating shaft; A plurality of fixed contacts for abutting against the spring assembly.

2. The knob assembly according to claim 1, characterized in that: The elastic telescopic projection comprises: A sliding protrusion, the sliding protrusion is used to radially engage with the gear member; A first spring is connected to the sliding protrusion, and the sliding protrusion slides toward one side of the gear member by means of the elastic force of the first spring.

3. The knob assembly according to claim 1, characterized in that: The gear member comprises: A first connecting portion, the first connecting portion is used to connect with the rotating shaft; a gear portion, the gear portion being connected to the first connecting portion, the gear portion being used for radially engaging with the elastic telescopic protrusion; A second connecting portion, wherein the second connecting portion is connected to a side of the gear portion away from the first connecting portion, and the second connecting portion is used to connect to the spring assembly.

4. The knob assembly according to claim 3, characterized in that: The first connecting portion comprises: a first connecting shaft connected to the gear portion; A first retaining groove is provided on the first connecting shaft, and the first retaining groove is used for matching and connecting with the rotating shaft.

5. The knob assembly according to claim 4, characterized in that: The first connecting portion further includes: A boss, the boss being disposed in the first locking groove; The second spring is sleeved on the convex column, one end of the second spring abuts against the first locking groove, and the other end abuts against the rotating shaft, and the second spring is used to drive the rotating shaft to move.

6. The knob assembly according to claim 3, characterized in that: The second connecting portion comprises: a second connecting shaft, the second connecting shaft being connected to a side of the gear portion away from the first connecting portion; a first clamping surface, the first clamping surface being disposed on the second connecting shaft, and the first clamping surface being used for clamping with the spring assembly; A third connecting shaft is connected to a side of the second connecting shaft away from the gear portion.

7. The knob assembly according to claim 1, characterized in that: The rotating shaft comprises: Axis body; A second clamping surface, the second clamping surface is arranged on the rotating shaft body, and the second clamping surface is used for clamping with the gear member; A first cavity, the first cavity is opened on a side of the shaft body close to the second clamping surface, and the first cavity is used to connect with the second spring of the gear member; A first stop key, the first stop key is arranged on the rotating shaft body, and the first stop key is used to stop the rotating shaft body from rotating; A third clamping surface, wherein the third clamping surface is arranged on the rotating shaft body, and the third clamping surface is used to drive the rotating shaft body to rotate.

8. The knob assembly according to claim 7, characterized in that: The rotating shaft also includes: A first protruding rod, wherein the first protruding rod is disposed on the rotating shaft body and extends outward from the rotating shaft body; A return spring is used to abut against the first protruding rod, and the shaft body is rotated by means of the elastic force of the return spring.

9. The knob assembly according to claim 1, wherein: The shrapnel assembly comprises: A first fixing seat; A second retaining groove, the second retaining groove is arranged on a side of the first fixing seat close to the gear member, and the second retaining groove is used for retaining the gear member; A first fixing portion, the first fixing portion being disposed on a side of the first fixing seat away from the gear member; A metal spring, one end of which is fixed to the first fixing portion, and the other end of which is used to contact the fixed contact; The knob assembly further includes a housing, the housing comprising: A first base, wherein the middle portion of the first base has a middle partition; A printed circuit board, the printed circuit board is connected to the first base, the fixed contacts are arranged on the printed circuit board, and a plurality of the fixed contacts are arranged in a circular distribution; A first cover plate, the first cover plate is connected to the first base, and the first cover plate is located on a side of the middle partition away from the printed circuit board; A second cover plate, the second cover plate is connected to the first base, and the second cover plate is located on a side of the first cover plate away from the middle partition plate; The first connecting portion of the gear member is rotatably connected to the first cover plate, the gear portion of the gear member is located between the first cover plate and the middle partition plate, a slide rail is provided on the side of the middle partition plate close to the first cover plate, the slide rail is used to be slidably connected with the elastic telescopic protrusion, the second connecting portion of the gear member passes through the middle partition plate and extends toward one side of the printed circuit board, the spring assembly is connected to the second connecting portion, and the printed circuit board is provided with the fixed contact that cooperates with the spring assembly; The rotating shaft passes through the second cover plate and is clamped with the first connecting portion. A limiting groove is provided on the second cover plate, and the limiting groove is used to be connected with a first stop key of the rotating shaft. The return spring of the rotating shaft is arranged on the side of the first cover plate close to the second cover plate, and the return spring is used to abut against the first protruding rod of the rotating shaft.

10. A household appliance, characterized in that: The household appliance comprises the knob assembly according to any one of claims 1-9.

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