Intermittent rotation mechanism

Abstract

An intermittent rotating head mechanism is composed of a synchronous motor, an eccentric lever, a spline wheel, a spline shaft sleeve, and a bearing. The synchronous motor is arranged on the fixed plate of the electric fan and drives the eccentric lever to rotate. A dial is provided at the end of the eccentric lever, and the dial extends into the keyway of the spline wheel. The keyways are radially equally divided around the center of the spline wheel to form a star structure, and adjacent straight grooves are sequentially connected by arc grooves; the keyways are divided into straight grooves, arc grooves, and short grooves according to their shapes and lengths; the lever rotates driven by the synchronous motor. When the dial of the eccentric lever enters the straight groove of the spline wheel, it drives the spline wheel to rotate; when the dial enters the arc groove, the dial of the eccentric lever moves along the arc groove, and the spline wheel does not rotate. This swing head structure can add multiple pauses at the middle position during the process of the electric fan shaking its head, extend the air supply time at the middle, improve the air supply efficiency, meet the air supply needs of users, and this mechanism can also be applied to other rotating electrical appliances with stopping requirements.

Description

Technical Field

[0001] The present invention relates to a purely mechanical head swing device for electrical products, in particular to an intermittent head swing mechanism used on products such as electric fans and electric heating fans, or an intermittent pause rotation mechanism used on products such as Hongyun fans, rotary induction cookers, and electric grills. Background Art

[0002] The head rotation mechanism and head swing mechanism on electrical products are already a very mature modular product structure. For example, there are generally two structures to achieve head swing on household electric fans and electric heating fans:

[0003] The first is that the worm on the rotor shaft engages with the matching turbine. There is an eccentric shaft on the turbine, which drives the connecting rod to move back and forth, and drives the fan head to swing left and right.

[0004] The second method is to rely on a synchronous motor (with its own reducer) to make the fan head swing. The rotation direction of the synchronous motor is random. When it encounters resistance, it will automatically change the rotation direction. When the swing head swings to the set position, it will be blocked and the synchronous motor will rotate back, thus forming a back and forth swing head phenomenon.

[0005] The fan's oscillating head typically rotates at a constant angular velocity, pausing briefly before turning at its extreme ends. This is a result of the aforementioned structure. Therefore, the fan's oscillating head typically delivers air slightly longer at its extreme ends than from the front. However, users typically position themselves near the front of the fan, and thus experience less air flow than at the sides.

[0006] How to increase the air supply time in the middle part of the fan's shaking process without adding circuit control has been a long-standing unresolved problem in the home appliance field.

[0007] Similarly, other electronic products, such as Hongyun fans, electric grills, and induction cookers, also use intermittent pause rotation mechanisms. Based on circular motion, intermittent pauses can be achieved, which can help improve the performance of the product. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a head swing mechanism which can produce intermittent pauses when swinging the head and has automatic pauses at multiple angles, thereby extending the air supply time near the front of the fan.

[0009] The technical solution adopted by the present invention to solve the above problems is as follows: An intermittent rotation mechanism is applied to electrical appliances such as electric fans and heaters. It is arranged on a fixing plate connected to the electrical appliance housing and consists of a synchronous motor, an eccentric lever, a spline wheel, a spline shaft sleeve, and a bearing. The characteristics are as follows: A spline wheel is arranged on the swing head main shaft of the electrical appliance. The synchronous motor is arranged on the fixing plate of the electric fan and drives the eccentric lever to rotate. A dial is arranged at the end of the eccentric lever, and the dial extends into the key groove of the spline wheel. The key grooves are radially equally divided around the center of the spline wheel to form a star structure, and adjacent straight grooves are sequentially connected by arc grooves; The key grooves are divided into straight grooves and arc grooves according to their shapes; When the lever rotates driven by the synchronous motor, when the dial of the eccentric lever enters the straight groove of the spline wheel, it drives the spline wheel to rotate; When the dial enters the arc groove, the dial of the eccentric lever moves along the arc groove, and the spline wheel does not rotate; The spline shaft sleeve is fixedly connected to the base housing.

[0010] One or two short grooves are also provided on the spline wheel, and the length of the short groove is less than that of the ordinary straight groove.

[0011] The short groove of the spline wheel is formed by inserting a blocking block into the straight groove to shorten the length of the key groove.

[0012] An installation seat for cooperating with the spline shaft sleeve and the bearing is arranged on the inner side of the spline wheel.

[0013] Compared with the prior art, the advantages of the present invention are as follows: During the circular motion of the intermittent rotation mechanism, it is divided into multiple stop directions. At the stop directions, the orientation of the fan will maintain that direction for a period of time and then continue to rotate to the next direction. It can form an intermittent pause air supply effect.

[0014] The length of the ordinary straight groove enables the eccentric lever to rotate normally for one week. The dial pushes one side of the straight groove to drive the straight groove to rotate, and then the spline wheel drives the swing head main shaft to perform intermittent swinging, achieving the design effect.

[0015] When the synchronous motor encounters resistance, it will automatically rotate in the reverse direction. The preset short groove can add an automatic swing head function to the intermittent rotation mechanism. When the dial reaches the direction where the short groove is located, the eccentric lever driven by the synchronous motor rotates, and its dial will be blocked by the end of the short groove. The synchronous motor will rotate back after being blocked, realizing automatic turning back. Therefore, when the dial enters the end of the short groove, it will reverse, meeting the need for left and right swinging air supply.

[0016] The short groove can be formed by inserting a blocking block into the straight groove. Therefore, the spline wheel can be manufactured according to a standard. According to the actual air supply range requirements, a blocking block is inserted into the corresponding straight groove to set the swing angle of the fan, which has an adjustable effect. The drawings are briefly described

[0017] Figure 1 : Structural diagram of the present invention on an electric fan.

[0018] Figure 2 : Enlarged view of the spline wheel and the eccentric lever.

[0019] Figure 3 : Schematic diagram state one (the dial enters the straight groove and starts to swing, the dial enters the deep part of the straight groove).

[0020] Figure 4 : Schematic diagram state two (the dial reaches the top of the straight groove).

[0021] Figure 5 : Schematic diagram state three (the dial exits from the straight groove and continues to swing).

[0022] Figure 6 : Schematic diagram state four (the dial enters the arc groove and the intermittent rotation stops).

[0023] Figure 7 : Schematic diagram state five (the dial enters the end of the short groove, and the synchronous motor rotates back after being blocked).

[0024] In Figures 3 to 7 In order to clearly show the relative relationship between the dial and the key groove of the spline wheel, only the rotating shaft of the eccentric lever itself and the position of the dial are retained, and the lever part of the eccentric lever is omitted.

[0025] In the above figure, 1 is the bottom plate, 2 is the synchronous motor, 3 is the fixing plate, 4 is the eccentric lever, 5 is the spline wheel, 6 is the spline shaft sleeve, 7 is the bearing, 8 is the base housing, 9 is the electric fan head, and 10 is the controller.

[0026] 41 is the rotating shaft connection of the eccentric lever, 42 is the lever, 43 is the dial at the end of the lever, 51 is the straight groove, 52 is the arc groove, 53 is the short groove, 54 is the mounting seat, 55 is the blocking block; 91 is the swing head main shaft. Detailed implementation method

[0027] The present invention is an intermittent rotation mechanism applied to electrical products. The following further describes the embodiments of the present invention with reference to the accompanying drawings, and in the embodiments herein, the electrical product is taken as an electric fan for illustration, but the intermittent rotation mechanism referred to in the present invention is applicable to all electrical fields with a rotation function, not limited to electric fans only.

[0028] As Figure 1 shown, the electric fan or heater is a common household model, and is default composed of a base, a swing head main shaft and a fan head. The swing head main shaft can be selected in different lengths according to actual needs.

[0029] The base is composed of a base housing and a bottom plate, and the fixing plate is fixedly connected to the base housing. The intermittent rotation mechanism consists of a synchronous motor, an eccentric lever, a spline wheel, a spline shaft sleeve, and a bearing. The synchronous motor is installed on the fixing plate, the rotating shaft connection of the eccentric lever is connected to the output shaft of the synchronous motor, a dial is provided at the end of the eccentric lever, and the dial moves within the keyway of the spline wheel. As the dial rotates, it drives the corresponding rotation of the spline wheel.

[0030] The center of the spline wheel is a bearing mounting seat, the spline shaft sleeve is fixedly connected to the base housing, stably supporting the rotation of the swing head main shaft. The spline wheel is provided with keyways, which are radially equally divided around the center of the spline wheel to form a star structure, and adjacent straight grooves are sequentially connected by arc grooves; the keyways are divided into straight grooves, arc grooves, and short grooves according to their shapes and lengths. The length of the straight groove exceeds the maximum length required for the dial to rotate one week, that is, the end radius of the straight groove is greater than the distance between the dial and the center of the spline wheel when the eccentric lever is in the lowest position.

[0031] The length of the short groove is shorter than that of the straight groove. The short groove can be directly integrally processed into a short groove, or it can be formed by inserting a blocking block into a common straight groove to shorten the length. The end of the short groove blocks the rotation of the dial, and the eccentric lever cannot rotate one week. Then the synchronous motor automatically reverses under the resistance, realizing an automatic turn-back. Therefore, when the dial enters the end of the short groove, it will reverse, meeting the requirement of left and right swinging air supply and realizing the function of automatic swing head.

[0032] Figures 3 to 7 The following are the schematic diagrams of the working states of the intermittent rotation mechanism:

[0033] Figure 3 As the synchronous motor rotates, the dial at the end of the eccentric lever enters the straight groove, rotates along the side wall of the straight groove and pushes the spline wheel to rotate, driving the fan head to deflect the air supply direction.

[0034] Figure 4 When the dial enters the farthest end of the straight groove, it still pushes the spline wheel to rotate, driving the fan head to turn.

[0035] Figure 5 When the dial retreats from the farthest end of the straight groove, it still pushes the spline wheel to rotate, driving the fan head to turn.

[0036] Figure 6 When the dial enters the arc groove, at this time the eccentric lever rotates idly, the dial moves along the arc groove track, does not push the spline wheel, and the fan head realizes intermittent stop, stably supplying air continuously in one direction.

[0037] Figures 3 to 6 The working states are cycled in sequence, realizing that the fan stops for a while after facing a certain angle and then continues to shake its head to supply air.

[0038] Figure 7 The thumbwheel enters the short slot, but the slot is not long enough for the thumbwheel to rotate one circle. Therefore, the thumbwheel gets stuck at the bottom of the slot, causing resistance to the synchronous motor. The synchronous motor automatically reverses after encountering the resistance, achieving automatic return and completing the fan head swing action.

[0039] The present invention is an experimental improvement to existing household appliances such as electric fans and electric heating fans. It can add several more resting points within the air supply range on the basis of the left and right swing head of an ordinary fan, and supply air for a longer time at the resting points. It is a purely mechanical structure, does not require circuit board support, and does not require more requirements for existing synchronous motors and control circuit boards. It is a technological breakthrough in the fan field. By designing the number of straight slots and the angle of the straight slots, the stopping direction and the swing head air supply angle of the intermittent swing head can be accurately designed, so that it can better meet the user's air supply needs. By presetting the position and number of short slots, the air supply can be intermittently swung between the angle ranges of the two short slots.

[0040] The intermittent rotation mechanism described in this invention, even without the short slots, can be applied to circularly rotating appliances such as fans, rotary induction cookers, and electric grills. Similarly, its main shaft's circular motion can produce multiple preset pauses, the same number of which corresponds to the number of straight slots, and the duration of these pauses is related to the time the dial wheel moves within the arc slot. This achieves highly reliable intermittent rotation entirely through mechanical design.

Claims

1. An intermittent rotation mechanism is applied to an electric fan or an electric heater fan device for controlling the deflection of the pointing angle of the electric fan head. It is arranged on a fixing plate connected to the electric fan housing and consists of a synchronous motor, an eccentric lever, a spline wheel, a spline shaft sleeve, and a bearing. It is characterized in that: A spline wheel is provided on the swing main shaft of the electric fan or the electric heater fan. The synchronous motor is arranged on the fixed plate of the electric fan and drives the eccentric lever to rotate. A dial is arranged at the end of the eccentric lever, and the dial extends into the keyway of the spline wheel. The keyways are divided into straight grooves, arc grooves and short grooves according to their shapes and lengths. The keyways are radially equally divided around the center of the spline wheel to form a star structure, and the adjacent straight grooves are sequentially connected by arc grooves. The length of the straight groove exceeds the maximum length required for the dial to rotate one week, the length of the short groove is less than the length of the straight groove, and the end of the short groove blocks the rotation of the dial, so that the eccentric lever cannot rotate one week. The lever rotates under the drive of the synchronous motor. When the dial of the eccentric lever enters the straight groove of the spline wheel, it drives the spline wheel to rotate. When the dial enters the arc groove, the dial of the eccentric lever moves along the arc groove, and the spline wheel does not rotate.

2. The intermittent rotation mechanism according to claim 1, wherein: One or two short grooves are provided on the spline wheel.

3. The intermittent rotation mechanism according to claim 2, wherein: The short groove of the spline wheel is formed by inserting a blocking block into the straight groove to shorten the length of the keyway.

4. The intermittent rotation mechanism according to claim 1, wherein: A mounting seat for fitting the spline shaft sleeve and the bearing is provided inside the spline wheel.

5. The intermittent rotation mechanism according to claim 1, characterized in that: The spline shaft sleeve is fixedly connected to the base housing.

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