Fan

Abstract

The utility model provides a fan. The fan comprises a mounting column; the driving assembly is mounted on the mounting column; the transmission assembly comprises a first-stage transmission structure and a second-stage transmission structure, the input end of the first-stage transmission structure is connected with the driving assembly, and the output end of the first-stage transmission structure is connected with the input end of the second-stage transmission structure; the fan head can be rotatably mounted on the mounting column, is connected with the output end of the secondary transmission structure, and can be driven by the output end of the secondary transmission structure to rotate in a vertical plane; and the damping assembly is mounted on the mounting column and can generate elastic deformation so as to generate torque opposite to the gravity torque of the fan head in direction. According to the scheme, part of gravity can be counteracted through the damping assembly, and therefore the force needed by the driving assembly for driving the fan head to conduct pitching rotation can be reduced. Meanwhile, by increasing the reduction ratio of the transmission assembly, the power needed by the driving assembly is reduced, and therefore the cost of the driving assembly is reduced.

Description

Technical Field

[0001] The present application relates to the field of household electrical appliances, and in particular, to a fan. Background Art

[0002] In related solutions, fans with pitch functions generally use a pitch mechanism composed of a motor and gears to drive the fan head to pitch and rotate, so as to adjust the pitch angle of the fan head. However, since the center of gravity of the fan head is a certain distance away from its rotation center, the pitch mechanism needs to overcome the torque formed by the gravity of the fan head. During the pitch process, this gravity torque is a variable value, and it reaches its maximum when the fan head is in a horizontal position. Among them, the heavier the fan head, the greater the torque that the motor needs to output, and the greater the torque that the motor needs to output, the larger the motor is required, which not only makes the motor larger, but also makes the cost of the motor very high.

[0003] Therefore, how to design a fan with low cost and small size has become a problem that needs to be solved urgently. Utility Model Content

[0004] The utility model aims to at least solve the technical problem of low cost and large volume of a fan with a pitch function existing in the prior art or related art.

[0005] Therefore, one object of the present invention is to provide a fan.

[0006] To achieve the above-mentioned purpose, the technical solution of the first aspect of the utility model provides a fan, including: a mounting column; a drive assembly, mounted on the mounting column; a transmission assembly, including a primary transmission structure and a secondary transmission structure, the input end of the primary transmission structure is connected to the drive assembly, and the output end of the primary transmission structure is connected to the input end of the secondary transmission structure; a fan head, rotatably mounted on the mounting column, connected to the output end of the secondary transmission structure (the connection is a direct connection or an indirect connection), and capable of rotating in a vertical plane under the drive of the output end of the secondary transmission structure; a damping assembly, mounted on the mounting column, capable of elastic deformation to generate a torque in the opposite direction to the gravity torque of the fan head.

[0007] The utility model provides a fan, which includes a mounting column, a transmission assembly, a drive assembly, a fan head and a damping assembly. Among them, the drive assembly, the transmission assembly, the fan head and the damping assembly are all mounted on the mounting column. The drive assembly is used to drive the fan head to rotate in a vertical plane through the transmission assembly, thereby realizing the pitch movement of the fan head. The damping assembly can undergo elastic deformation to generate a torque in the opposite direction to the gravity torque of the fan head, that is, the damping assembly is used to offset part of the gravity, thereby reducing the force required by the drive assembly to drive the fan head to pitch and rotate. The transmission assembly specifically includes a primary transmission structure and a secondary transmission structure, that is, the transmission assembly is at least a 2-stage transmission, thereby increasing the reduction ratio of the transmission assembly. When the reduction ratio increases, the drive assembly only needs to provide a smaller force to drive the fan head to pitch and rotate. Therefore, by increasing the reduction ratio of the transmission assembly, the power required by the drive assembly is reduced, thereby reducing the cost of the drive assembly. Because the greater the power required by the drive assembly, the higher its cost.

[0008] For example, for a motor, the greater the power required by the motor, the larger the motor will be if the volume power density of the motor does not change much. The larger the motor is, the more copper, iron and magnetic steel it will require, and the greater the cost of the motor will be.

[0009] In addition, the fan in the above technical solution provided by the utility model may also have the following additional technical features:

[0010] In the above technical solution, optionally, the transmission component is a plastic component.

[0011] In this technical solution, the transmission component can be formed by processing plastic material, for example, a plastic gear set can be used as the transmission component. By setting the transmission component as a plastic component compared to the existing transmission component made of metal material, the cost of the fan can be further reduced.

[0012] In the above technical solution, the driving assembly may optionally include a motor, because the motor is a commonly used driving component in the fan, and the technology of using the motor for pitch driving of the fan is relatively mature, which can reduce the difficulty of fan processing and facilitate the processing and manufacturing of the fan.

[0013] In the above technical solution, optionally, the primary transmission structure is a POM (polyformaldehyde, a thermoplastic crystalline polymer) part or a nylon part, and the secondary transmission structure is a POM part or a nylon part. The primary transmission structure can be specifically formed by processing POM material or nylon material. The secondary transmission structure can be specifically formed by processing POM material or nylon material. Exemplarily, the primary transmission structure and the secondary transmission structure are made of the same material. Of course, the primary transmission structure and the secondary transmission structure may also be made of different materials.

[0014] In the above technical solution, optionally, the reduction ratio of the transmission assembly is greater than or equal to 1:13 and less than or equal to 1:7.

[0015] In this technical solution, the required reduction ratio can be calculated based on the conventional weight of the fan and the cost of the motor. After calculation, when the reduction ratio is designed within the range of 1:13-1:7, a smaller motor can be used to drive most fans to pitch.

[0016] In the above technical solution, optionally, the reduction ratio of the primary transmission structure is greater than or equal to 1:3.6 and less than or equal to 1:2.5, and the reduction ratio of the secondary transmission structure is greater than or equal to 1:3.6 and less than or equal to 1:2.5.

[0017] In this technical solution, the reduction ratio of each stage is set between 1:3.6-1:2.5, so that the overall reduction ratio of the transmission assembly can be within the range of 1:13-1:7 by using two-stage transmission. The use of two-stage reduction ratios can make the overall structure of the fan simpler, thereby reducing the overall weight of the fan and the overall volume of the transmission assembly.

[0018] In the above technical solution, optionally, the primary transmission structure includes a primary driving gear connected to the driving assembly and a primary driven gear meshed with the primary driving gear. The secondary transmission structure includes a secondary driving gear connected to the primary driven gear and a secondary driven gear meshed with the secondary driving gear. The fan head is drivingly connected to the secondary driven gear.

[0019] In this technical solution, the transmission assembly is a two-stage transmission gear assembly. This transmission assembly has a simple structure and reliable transmission, which not only makes the product easier to process, but also improves the reliability of the fan head during pitch rotation.

[0020] In the above technical solution, optionally, the primary driven gear and the secondary driving gear are coaxially arranged.

[0021] In this technical solution, the primary driven gear and the secondary driving gear are coaxially arranged, that is, the rotation center lines of the two are the same, so that the size of the entire transmission assembly can be reduced and the transmission assembly can be made more compact. In this way, the size of the entire fan head can be reduced to reduce the volume of the entire fan head.

[0022] In the above technical solution, optionally, the primary driven gear and the secondary driving gear are an integrated structure, or the primary driven gear and the secondary driving gear are drivingly connected.

[0023] In this technical solution, the primary driven gear and the secondary driving gear can be formed by the same part, so that the primary driven gear and the secondary driving gear can be set as an integrated structure. This setting makes the connection between the primary driven gear and the secondary driving gear more reliable.

[0024] Exemplarily, the primary driven gear and the secondary driving gear may also be a split structure, and the two are drivingly connected via a shaft or teeth.

[0025] In the above technical solution, optionally, the tooth thickness of the primary driving gear is greater than or equal to 1 mm. This arrangement can ensure the strength of the primary driving gear and prevent the primary driving gear from being damaged due to insufficient strength.

[0026] In the above technical solution, optionally, the primary driving gear, the primary driven gear, the secondary driving gear and the secondary driven gear are at least one of POM gears and nylon gears. By setting the driven gears and the driving gears of each stage to POM gears or nylon gears, the cost of the transmission assembly can be reduced.

[0027] In the above technical solution, optionally, the secondary driven gear includes a meshing portion meshing with the secondary driving gear, and a driven shaft arranged on the meshing portion. The fan includes a first rocker arm, one end of the first rocker arm is connected to the driven shaft, and the other end of the first rocker arm is connected to the fan head.

[0028] In this technical solution, when the transmission assembly is a two-stage transmission, a meshing portion and a driven shaft can be provided on the secondary driven gear. The driven shaft is the output end of the entire transmission assembly, so that the fan head can be driven to perform pitch motion through the driven shaft. Specifically, a first rocker arm can be connected between the fan head and the driven shaft, so that when the driven shaft rotates, the first rocker arm can be driven to rotate, thereby driving the fan head to perform pitch motion through the first rocker arm.

[0029] In the above technical solution, optionally, the damping assembly includes: a rotating part, installed on a mounting column and connected to the fan head, so that when the fan head rotates in a vertical plane, it can drive the rotating part to rotate; a torsion spring, which can undergo torsional deformation when the rotating part follows the rotation of the fan head to generate a torque in the opposite direction to the gravity torque of the fan head.

[0030] In this technical solution, a rotating member is also installed on the fan head, and when the fan head pitches, the rotating member rotates with the fan head. At the same time, a torsion spring is provided for the rotating member, and when the rotating member rotates, it can drive the torsion spring to undergo torsional deformation, thereby generating a torsional force, and the torsional moment is opposite to the gravity moment generated by the gravity of the fan head, so that the torsional moment can offset part of the gravity moment, so that the drive assembly only needs to provide a smaller holding torque to maintain the balance of the fan head, thereby reducing the holding torque of the drive assembly, thereby reducing the cost of the drive assembly.

[0031] In the above technical solution, optionally, the damping assembly further includes a mounting shaft mounted on the mounting column, the rotating member includes a sleeve, the sleeve is rotatably mounted on the mounting shaft, the torsion spring is mounted between the mounting shaft and the sleeve, the sleeve is provided with a first tail groove, and the first tail end of the torsion spring is mounted in the first tail groove. Optionally, the rotating member further includes a second rocker arm, one end of the second rocker arm is mounted on the rotating member, the other end of the second rocker arm is connected to the fan head, the second rocker arm can rotate with the fan head, and drive the rotating member to rotate.

[0032] In this technical solution, in order to facilitate the installation of the torsion spring and the rotating member, a mounting shaft is also provided. The rotating member includes a sleeve. During installation, the sleeve can be rotatably sleeved outside the mounting shaft, and the torsion spring can be installed between the mounting shaft and the sleeve. At the same time, in order to fix the torsion spring and the sleeve, a first tail groove can be provided on the sleeve, and then the first tail end of the torsion spring can be inserted and fixed into the first tail groove. In this way, when the sleeve rotates, the torsion spring can be driven to twist through the first tail groove, so that the torsion spring is fixed in the sleeve, so that when the sleeve rotates, the torsion spring can be twisted and deformed.

[0033] The rotating member also includes a second rocker arm. The installation position of the shaft sleeve can be changed by the second rocker arm, so that the installation position of the shaft sleeve is more flexible, thereby making the structural design of the entire fan more convenient.

[0034] Exemplarily, the second rocker arm and the shaft sleeve are connected into one part, that is, the second rocker arm and the shaft sleeve are an integrated structure. The second rocker arm and the shaft sleeve can be integrally formed, or can be separately formed first and then assembled into a whole.

[0035] In the above technical solution, optionally, the mounting shaft includes a shaft body and a first ring installed outside the shaft body, at least a portion of the first ring is connected to the shaft body, the first ring and the shaft body form an annular mounting groove, the torsion spring is at least partially installed in the annular mounting groove, a second tail groove is provided on the first ring, and the second tail end of the torsion spring extends from the second tail groove; a second ring is provided on one end of the sleeve close to the first ring, and the second ring can be rotatably mounted on the first ring; and an end of the sleeve away from the first ring can be rotatably mounted on the shaft body.

[0036] In this technical solution, a rotational connection is required between the mounting shaft and the sleeve. In order to achieve the rotational connection between the two, a first ring is provided on the mounting shaft. The first ring is a rotating static ring. A second ring is provided on the sleeve, and the second ring is a rotating dynamic ring. Through the cooperation of the first ring and the second ring, a bearing-like structure can be formed between the mounting shaft and the sleeve, thereby realizing a sliding connection between the mounting shaft and the sleeve. At the same time, in order to fix the torsion spring, the torsion spring is at least partially located in the first ring, so that the circumferential and axial limiting of the torsion spring can be achieved through the first ring. At the same time, in order to fix the second tail end of the torsion spring, a second tail groove is provided on the first ring, and the second tail end of the torsion spring is located in the second tail groove. In this way, the fixing of one tail end of the torsion spring can be achieved. At the same time, the other end of the sleeve is rotationally connected to the shaft body, so that the rotational installation of the sleeve on the mounting shaft can be ensured by positioning at both ends.

[0037] Exemplarily, the second tail end of the torsion spring is located at one side of the second collar arranged along the axial direction. For example, the second tail end of the torsion spring is located at a side of the second collar away from the second rocker arm. One end of the second collar and the second tail end of the torsion spring may abut against each other, or a certain gap may be provided.

[0038] In the above technical solution, optionally, the fan also includes: a reduction gearbox housing, used to accommodate the transmission assembly, a first axial hole and a second axial hole are provided on the reduction gearbox housing, the output end of the secondary transmission structure extends from the first axial hole, and the input end of the primary transmission structure extends from the second axial hole; the drive assembly is located outside the reduction gearbox housing, and the mounting shaft is located outside the reduction gearbox housing and is mounted on the reduction gearbox housing.

[0039] In this technical solution, the reduction box housing and the transmission assembly form a reducer. The reducer is provided with a first shaft hole and a second shaft hole for driving connection between the input end of the transmission assembly and the drive assembly, and for driving connection between the output end of the transmission assembly and the fan head. The mounting shaft is installed outside the reduction box housing and is an integrated structure with the reduction box housing. Of course, the mounting shaft can also be a separate structure from the reduction box housing.

[0040] For example, the reduction gearbox housing includes a reduction gearbox seat and a reduction gearbox cover with an openable cover mounted on the reduction gearbox seat.

[0041] In the above technical solution, optionally, the mounting shaft is coaxial with the output end of the secondary transmission structure, the mounting shaft and the first axial hole are arranged on two opposite sides of the reduction gearbox housing, and the second axial hole and the mounting shaft are arranged on the same side of the reduction gearbox housing.

[0042] Furthermore, in order to optimize the structural layout of the fan, the mounting shaft and the output end of the transmission assembly can be designed to be coaxial. The mounting shaft is mounted on the reduction box housing, and the mounting shaft and the first shaft hole on the reduction box housing can be processed together, thereby ensuring the coaxiality of the mounting shaft and the output end of the transmission assembly.

[0043] In the above technical solution, optionally, the mounting column includes: a mounting box, the mounting box includes a mounting seat and a decorative cover, and the mounting seat and the decorative cover enclose an installation space. The drive assembly, the transmission assembly and the damping assembly are installed in the installation space; the fan also includes a first rocker arm. One end of the first rocker arm is connected to the output end of the secondary transmission structure, and the other end of the first rocker arm is connected to the fan head. The rotating member includes a second rocker arm, one end of the second rocker arm is installed on the mounting column, and the other end of the second rocker arm is connected to the fan head, and the second rocker arm can rotate with the fan head. The first rocker arm and the second rocker arm are both located outside the mounting box, and are located on two sides of the mounting box that are opposite to each other, and along the axial direction of the output end of the secondary transmission structure, a gap is set between the first rocker arm and the second rocker arm and the outer wall of the mounting box.

[0044] In this technical solution, the mounting column includes a mounting box, which is surrounded by a mounting seat and a decorative cover. The drive assembly, the transmission assembly and the damping assembly are installed in the mounting box, so that the drive assembly, the transmission assembly and the damping assembly can be installed into an assembly through the mounting box. At the same time, the outside of the mounting box is symmetrically provided with a first rocker arm and a second rocker arm, and the first rocker arm and the second rocker arm are both connected to the fan head and connected to the parts in the mounting box. And the first rocker arm and the second rocker arm can both rotate. In order to avoid friction between the first rocker arm and the second rocker arm and the mounting box, a gap is set between the first rocker arm and the second rocker arm and the outer wall of the mounting box. In this structure, the drive assembly, the transmission assembly and the damping assembly are installed as a whole through an installation box, thereby optimizing the structural layout of the product.

[0045] In the above technical solution, optionally, when the fan head rotates in a vertical plane, the axial direction of its rotation axis is a first axial direction, and a receiving groove is provided on the fan head. Limiting grooves are respectively provided on both sides of the receiving groove opposite to each other along the first axial direction, and the first rocker arm and the second rocker arm are limitedly installed in the two limiting grooves on both sides of the receiving groove one by one.

[0046] In this technical solution, the first rocker arm and the second rocker arm can be limited by the limiting groove, so that the first rocker arm and the second rocker arm can be connected to the fan head more reliably. Furthermore, the first rocker arm and the fan head, and the second rocker arm and the fan head are connected by screws.

[0047] In the above technical solution, optionally, the fan head can move between a first position and a second position on the vertical plane under the drive of the secondary transmission structure, and the torque generated by the damping assembly in the opposite direction to the gravity torque of the fan head increases from the first position to the second position. Optionally, when the fan head is in the first position, the angle between the fan head and the horizontal direction is greater than or equal to negative 15° and less than or equal to 0°. Optionally, when the fan head is in the second position, the angle between the fan head and the horizontal direction is greater than or equal to 60° and less than or equal to 85°.

[0048] In this technical solution, the pitch angle of the fan head is set in the range of negative 15°-85°, and the angle can be limited by a first position and a second position. Generally, the first position is close to the horizontal forward position of the fan head, and the second position is close to the vertical upward position of the fan head. In the first position, the torque generated by the damping assembly is the largest, and in the second position, the torque is the smallest. Furthermore, when the fan head is vertically upward, it blows air in the vertical direction, the airflow flows closer, and the airflow is not easy to blow towards the user. Therefore, the present application limits the pitch angle to less than or equal to 85°. In this way, the situation where the fan blows air towards the ceiling can be avoided. In addition, when the user uses the fan, there is also a need to blow air downward. Therefore, the present application sets the pitch angle to a minimum of negative 15°, so that the pitch angle of the fan is more reasonable and can better meet the various needs of users.

[0049] In the above technical solution, optionally, the mounting column further includes a first column, and the mounting box is mounted on the first column. The mounting column further includes a second column, and the second column is rotatably connected to the first column, and the first column can rotate relative to the second column to drive the fan head to rotate in the horizontal plane. This arrangement allows the fan to not only adjust the pitch angle, but also adjust the horizontal orientation of the fan head, thereby expanding the air supply range of the fan.

[0050] Optionally, the mounting column further comprises a chassis, and the second column is mounted on the chassis. The entire fan can be mounted on a platform such as the ground through the chassis. The setting of the chassis increases the grounding area of ​​the fan, and can make the fan installation more stable.

[0051] Furthermore, the reduction gearbox housing is provided with a plurality of (for example, 4) first screw holes, the first column is provided with a plurality of (for example, 4) first screw columns, and the reduction gearbox housing and the first column are fastened with screws.

[0052] Furthermore, a plurality of (for example, 4) second screw columns are arranged on the fan head, second screw holes are arranged on the first rocker arm and the second rocker arm, and the fan head and the first rocker arm as well as the fan head and the second rocker arm are fixed by screws.

[0053] Additional aspects and advantages of the present invention will become apparent in the following description or will be understood through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0055] Figure 1 This is one of the structural schematic diagrams of the fan of the utility model;

[0056] Figure 2This is the second structural schematic diagram of the fan of the utility model;

[0057] Figure 3 This is the third structural schematic diagram of the fan of the utility model;

[0058] Figure 4 This is the fourth structural schematic diagram of the fan of the utility model;

[0059] Figure 5 This is the fifth structural schematic diagram of the fan of the utility model;

[0060] Figure 6 This is the sixth structural schematic diagram of the fan of the utility model;

[0061] Figure 7 This is the seventh structural schematic diagram of the fan of the utility model;

[0062] Figure 8 This is the eighth structural schematic diagram of the fan of the utility model;

[0063] Fig. 9 This is the ninth structural diagram of the fan of the utility model;

[0064] Fig.10 This is the tenth structural schematic diagram of the fan of the utility model;

[0065] Fig.11 This is the eleventh structural diagram of the fan of the utility model;

[0066] Fig.12 It is a schematic diagram of the relationship between the gravity moment and spring torque of the fan of the utility model and the rotation angle α;

[0067] Fig.13 It is a structural schematic diagram of a primary driving gear of a fan of the utility model.

[0068] in, Figures 1 to 13 The corresponding relationship between the reference numerals and component names in the figure is:

[0069] 1 mounting column, 12 mounting box, 122 mounting seat, 1222 first screw column, 124 decorative cover, 14 first column, 16 second column, 18 chassis, 2 driving assembly, 3 transmission assembly, 32 primary transmission structure, 322 primary driving gear, 324 primary driven gear, 34 secondary transmission structure, 342 secondary driving gear, 344 secondary driven gear, 3442 meshing part, 3444 driven shaft, 4 fan head, 42 receiving groove, 44 limiting groove, 46 second screw column, 5 damping assembly, 52 rotation Parts, 522 sleeve, 5222 first tail groove, 5224 second ring, 524 second rocker arm, 54 torsion spring, 542 first tail end, 544 second tail end, 56 mounting shaft, 562 shaft body, 564 first ring, 566 second tail groove, 6 first rocker arm, 7 outer cover, 8 annular mounting groove, 9 reducer housing, 92 reducer seat, 922 outlet hole, 94 reducer cover, 96 first shaft hole, 98 second shaft hole, 99 first screw hole, 10 anti-loosening bolt, A first position, B second position, C1 pitch circle. DETAILED DESCRIPTION

[0070] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0071] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0072] like Figures 1 to 13 As shown, an embodiment of the first aspect of the utility model provides a fan.

[0073] like Figures 1 to 6 As shown, an embodiment of the first aspect of the utility model provides a fan, which includes a mounting column 1, a transmission assembly 3, a drive assembly 2, a fan head 4 and a damping assembly 5.

[0074] Wherein, the driving assembly 2 is mounted on the mounting column 1; the transmission assembly 3 includes a primary transmission structure 32 and a secondary transmission structure 34, the input end of the primary transmission structure 32 is connected to the driving assembly 2, and the output end of the primary transmission structure 32 is connected to the input end of the secondary transmission structure 34; the fan head 4 can be rotatably mounted on the mounting column 1, connected to the output end of the secondary transmission structure 34 (the connection is a direct connection or an indirect connection), and can rotate in a vertical plane under the drive of the output end of the secondary transmission structure 34; the damping assembly 5 is mounted on the mounting column 1, and can be elastically deformed to generate a gravity torque direction with the fan head 4 (such as Fig.11 The opposite torque (in the direction indicated by the arrow).

[0075] The utility model provides a fan, which includes a mounting column 1, a transmission assembly 3, a drive assembly 2, a fan head 4 and a damping assembly 5. The drive assembly 2, the transmission assembly 3, the fan head 4 and the damping assembly 5 are all mounted on the mounting column 1. The drive assembly 2 is used to drive the fan head 4 to rotate in a vertical plane through the transmission assembly 3, that is, along the vertical direction (such as Figure 1 The fan head 4 is rotated up and down (as shown), thereby realizing the pitch movement of the fan head 4. The damping component 5 can undergo elastic deformation to generate a torque in the opposite direction to the gravitational torque of the fan head 4, that is, the damping component 5 is used to offset part of the gravity, thereby reducing the force required for the drive component 2 to drive the fan head 4 to perform a pitch rotation. The transmission component 3 specifically includes a primary transmission structure 32 and a secondary transmission structure 34, that is, the transmission component 3 is at least a 2-stage transmission, thereby increasing the reduction ratio of the transmission component 3. When the reduction ratio increases, the drive component 2 only needs to provide a smaller force to drive the fan head 4 to perform a pitch rotation. Therefore, by increasing the reduction ratio of the transmission component 3, the power required by the drive component 2 is reduced, thereby reducing the cost of the drive component 2. Because the greater the power required by the drive component 2, the higher its cost.

[0076] For example, for a motor, the greater the power required by the motor, the larger the motor will be if the volume power density of the motor does not change much. The larger the motor is, the more copper, iron and magnetic steel it will require, and the greater the cost of the motor will be.

[0077] In the above embodiment, optionally, the transmission component 3 is a plastic component.

[0078] In this embodiment, the transmission component 3 can be formed by processing plastic material, for example, a plastic gear set can be used as the transmission component 3. By setting the transmission component 3 as a plastic component compared to the existing transmission component 3 made of metal material, the cost of the fan can be further reduced.

[0079] In the above embodiment, the driving assembly 2 optionally includes a motor, because the motor is a commonly used driving component in the fan, and the technology of using the motor for pitch driving of the fan is relatively mature, which can reduce the difficulty of fan processing and facilitate the processing and manufacturing of the fan.

[0080] In the above embodiment, optionally, the primary transmission structure 32 is a POM (polyformaldehyde, a thermoplastic crystalline polymer) part or a nylon part, and the secondary transmission structure 34 is a POM part or a nylon part. The primary transmission structure 32 can be specifically formed by processing a POM material or a nylon material. The secondary transmission structure 34 can be specifically formed by processing a POM material or a nylon material. Exemplarily, the primary transmission structure 32 and the secondary transmission structure 34 are made of the same material. Of course, the primary transmission structure 32 and the secondary transmission structure 34 can also be made of different materials.

[0081] In the above embodiment, optionally, the reduction ratio of the transmission assembly 3 is greater than or equal to 1:13 and less than or equal to 1:7.

[0082] In this embodiment, the required reduction ratio can be calculated in combination with the conventional weight of the fan and the cost of the motor. After calculation, when the reduction ratio is designed within the range of 1:13-1:7, a smaller motor can be used to drive most fans to pitch.

[0083] In the above embodiment, optionally, the reduction ratio of the primary transmission structure 32 is greater than or equal to 1:3.6 and less than or equal to 1:2.5, and the reduction ratio of the secondary transmission structure 34 is greater than or equal to 1:3.6 and less than or equal to 1:2.5.

[0084] In this embodiment, the reduction ratio of each stage is set between 1:3.6-1:2.5, so that the overall reduction ratio of the transmission assembly 3 can be within the range of 1:13-1:7 by using two-stage transmission. The use of two-stage reduction ratios can make the overall structure of the fan simpler, thereby reducing the overall weight of the fan and reducing the overall volume of the transmission assembly 3.

[0085] In the above embodiment, optionally, Figure 5 and Figure 6 As shown, the primary transmission structure 32 includes a primary driving gear 322 connected to the driving assembly 2 and a primary driven gear 324 meshing with the primary driving gear 322. The secondary transmission structure 34 includes a secondary driving gear 342 connected to the primary driven gear 324 and a secondary driven gear 344 meshing with the secondary driving gear 342. The fan head 4 is drivingly connected to the secondary driven gear 344.

[0086] In this embodiment, the transmission assembly 3 is a two-stage transmission gear assembly. This transmission assembly 3 has a simple structure and reliable transmission, which not only makes the product easier to process, but also improves the reliability of the fan head 4 when it is pitched and rotated.

[0087] In the above embodiment, optionally, Figure 5 and Figure 6 As shown, the primary driven gear 324 is coaxially arranged with the secondary driving gear 342 .

[0088] In this embodiment, the primary driven gear 324 and the secondary driving gear 342 are coaxially arranged, that is, the rotation center lines of the two are the same, so that the size of the entire transmission assembly can be reduced and the transmission assembly can be made more compact. In this way, the size of the entire fan head can be reduced to reduce the volume of the entire fan head.

[0089] In the above embodiment, optionally, Figure 5 and Figure 6 As shown, the primary driven gear 324 and the secondary driving gear 342 are an integrated structure, or the primary driven gear 324 and the secondary driving gear 342 are drivingly connected.

[0090] In this embodiment, the primary driven gear 324 and the secondary driving gear 342 can be formed by the same part, so that the primary driven gear 324 and the secondary driving gear 342 can be set as an integrated structure. This arrangement makes the connection between the primary driven gear 324 and the secondary driving gear 342 more reliable.

[0091] Exemplarily, the primary driven gear 324 and the secondary driving gear 342 may also be a split structure, and the two are drivingly connected via a shaft or teeth.

[0092] In the above embodiment, optionally, the tooth thickness of the primary driving gear 322 is greater than or equal to 1 mm. This arrangement can ensure the strength of the primary driving gear 322 and prevent the primary driving gear 322 from being damaged due to insufficient strength.

[0093] In the above embodiment, optionally, the primary driving gear 322, the primary driven gear 324, the secondary driving gear 342 and the secondary driven gear 344 are at least one of a POM gear and a nylon gear. By setting the driven gears and the driving gears of each stage to be POM gears or nylon gears, the cost of the transmission assembly 3 can be reduced.

[0094] In the above embodiment, optionally, Figure 5 and Figure 6 As shown, the secondary driven gear 344 includes a meshing portion 3442 meshing with the secondary driving gear 342, and a driven shaft 3444 disposed on the meshing portion 3442. The fan includes a first rocker arm 6, one end of which is connected to the driven shaft 3444, and the other end of which is connected to the fan head 4.

[0095] In this embodiment, when the transmission assembly 3 is a two-stage transmission, a meshing portion 3442 and a driven shaft 3444 may be provided on the secondary driven gear 344. The driven shaft 3444 is the output end of the entire transmission assembly 3, so that the fan head 4 can be driven to perform a pitching motion through the driven shaft 3444. Specifically, the first rocker arm 6 may be connected between the fan head 4 and the driven shaft 3444, so that when the driven shaft 3444 rotates, the first rocker arm 6 may be driven to rotate, thereby driving the fan head 4 to perform a pitching motion through the first rocker arm 6.

[0096] In the above embodiment, optionally, Figure 5 and Figure 6 As shown, the damping assembly 5 includes: a rotating member 52, which is installed on the mounting column 1 and connected to the fan head 4. When the fan head 4 rotates in a vertical plane, it can drive the rotating member 52 to rotate; a torsion spring 54, which can be torsionally deformed when the rotating member 52 rotates with the fan head 4 to generate a torque in the opposite direction to the gravity torque of the fan head 4.

[0097] In this embodiment, a rotating member 52 is also installed on the fan head 4. When the fan head 4 performs pitch rotation, the rotating member 52 rotates along with the fan head 4. At the same time, a torsion spring 54 is provided for the rotating member 52. When the rotating member 52 rotates, it can drive the torsion spring 54 to undergo torsional deformation, thereby generating a torsional force. The torsional moment is opposite to the gravity moment generated by the gravity of the fan head 4, so that the torsional moment can offset part of the gravity moment. In this way, the drive assembly 2 only needs to provide a smaller holding torque to maintain the balance of the fan head 4, thereby reducing the holding torque of the drive assembly 2 and thus reducing the cost of the drive assembly 2.

[0098] In the above embodiment, optionally, Figure 5 and Figure 6 As shown, the damping assembly 5 further includes a mounting shaft 56 mounted on the mounting column 1, the rotating member 52 includes a shaft sleeve 522, the shaft sleeve 522 is rotatably mounted on the mounting shaft 56, the torsion spring 54 is mounted between the mounting shaft 56 and the shaft sleeve 522, the shaft sleeve 522 is provided with a first tail groove 5222, and the first tail end 542 of the torsion spring 54 is mounted in the first tail groove 5222. Optionally, as Figure 4 , Figure 5 and Figure 6 As shown, the rotating member 52 also includes a second rocker arm 524, one end of the second rocker arm 524 is installed on the rotating member 52, and the other end of the second rocker arm 524 is connected to the fan head 4. The second rocker arm 524 can rotate with the fan head 4 and drive the rotating member 52 to rotate.

[0099] In this embodiment, in order to facilitate the installation of the torsion spring 54 and the rotating member 52, a mounting shaft 56 is further provided. The rotating member 52 includes a shaft sleeve 522. During installation, the shaft sleeve 522 can be rotatably sleeved outside the mounting shaft 56, and the torsion spring 54 is installed between the mounting shaft 56 and the shaft sleeve 522. At the same time, in order to fix the torsion spring 54 and the shaft sleeve 522, a first tail groove 5222 can be provided on the shaft sleeve 522, and then the first tail end 542 of the torsion spring 54 is inserted and fixed into the first tail groove 5222, so that when the shaft sleeve 522 rotates, the torsion spring 54 can be driven to twist through the first tail groove 5222, so that the torsion spring 54 is fixed in the shaft sleeve 522, so that when the shaft sleeve 522 rotates, the torsion spring 54 can be twisted and deformed.

[0100] The rotating member 52 also includes a second rocker arm 524, through which the power of the fan head 4 can be transmitted to the rotating member 52. By providing the second rocker arm 524, the installation position of the rotating member 52 can be changed, making the installation position of the rotating member 52 more flexible, thereby facilitating the structural design of the entire fan.

[0101] Exemplarily, the second rocker arm 524 and the shaft sleeve 522 are connected to form a part, that is, the second rocker arm 524 and the shaft sleeve 522 are an integrated structure. The second rocker arm 524 and the shaft sleeve 522 can be integrally formed, or can be separately formed first and then assembled into a whole.

[0102] like Figure 6 As shown, an anti-loosening assembly is installed on one end of the shaft sleeve 522 mounting shaft 56, such as an anti-loosening bolt 10, and the anti-loosening assembly includes a stopper, and the shaft sleeve 522 is located inside the stopper. The stopper can limit the shaft sleeve 522 to prevent the shaft sleeve 522 from falling off the shaft sleeve 522.

[0103] In the above embodiment, optionally, Figure 5 and Figure 6 As shown, the mounting shaft 56 includes a shaft body 562 and a first ring 564 mounted outside the shaft body 562, at least a portion of the first ring 564 is connected to the shaft body 562, the first ring 564 and the shaft body 562 form an annular mounting groove 8, the torsion spring 54 is at least partially mounted in the annular mounting groove 8, a second tail groove 566 is provided on the first ring 564, and the second tail end 544 of the torsion spring 54 extends from the second tail groove 566; a second ring 5224 is provided at one end of the sleeve 522 close to the first ring 564, and the second ring 5224 can be rotatably mounted on the first ring 564; the end of the sleeve 522 away from the first ring 564 can be rotatably mounted on the shaft body 562.

[0104] In this embodiment, the installation shaft 56 and the sleeve 522 need to be rotatably connected. For the rotatable connection between the two, a first collar 564 is provided on the installation shaft 56. The first collar 564 is a rotating static ring. A second collar 5224 is provided on the sleeve 522, and the second collar 5224 is a rotating dynamic ring. Through the cooperation of the first collar 564 and the second collar 5224, a bearing-like structure can be formed between the installation shaft 56 and the sleeve 522, thereby realizing the sliding connection between the installation shaft 56 and the sleeve 522. At the same time, in order to fix the torsion spring 54, the torsion spring 54 is at least partially located in the first collar 564, so that the circumferential and axial positioning of the torsion spring 54 can be realized through the first collar 564. At the same time, in order to fix the second tail end 544 of the torsion spring 54, a second tail groove 566 is provided on the first collar 564, and the second tail end 544 of the torsion spring 54 is located in the second tail groove 566. In this way, the fixing of one tail end of the torsion spring 54 can be realized. At the same time, the other end of the shaft sleeve 522 is rotatably connected to the shaft body 562, so that the rotatable installation of the shaft sleeve 522 on the installation shaft 56 can be ensured by positioning at both ends.

[0105] For example, in order to fix the torsion spring 54 , one end of the second ring 5224 may be brought into contact with the second tail end 544 of the torsion spring 54 .

[0106] Exemplarily, the second tail end 544 of the torsion spring 54 is located at one side of the second collar 5224 along the axial direction. For example, the second tail end 544 of the torsion spring 54 is located at the side of the second collar 5224 away from the second rocker arm 524. One end of the second collar 5224 and the second tail end 544 of the torsion spring 54 may abut against each other, or a certain gap may be provided.

[0107] In the above embodiment, optionally, Figure 4 and Figure 5 As shown, the fan also includes: a reduction gearbox housing 9 for accommodating the transmission assembly 3, a first axial hole 96 and a second axial hole 98 are provided on the reduction gearbox housing 9, the output end of the secondary transmission structure 34 extends out from the first axial hole 96, and the input end of the primary transmission structure 32 extends out from the second axial hole 98; the drive assembly 2 is located outside the reduction gearbox housing 9, and the mounting shaft 56 is located outside the reduction gearbox housing 9 and is mounted on the reduction gearbox housing 9.

[0108] In this embodiment, the reduction box housing 9 and the transmission assembly 3 form a reducer. The reducer is provided with a first shaft hole 96 and a second shaft hole 98 for driving connection between the input end of the transmission assembly 3 and the drive assembly 2, and for driving connection between the output end of the transmission assembly 3 and the fan head 4. The mounting shaft 56 is mounted outside the reduction box housing 9 and is an integral structure with the reduction box housing 9. Of course, the mounting shaft 56 can also be a separate structure from the reduction box housing 9.

[0109] For example, the reduction gearbox housing 9 includes a reduction gearbox seat 92 and a reduction gearbox cover 94 which is openably mounted on the reduction gearbox seat 92 .

[0110] In the above embodiment, optionally, Figure 5 and Figure 6 As shown, the mounting shaft 56 is coaxial with the output end of the secondary transmission structure 34 , the mounting shaft 56 and the first shaft hole 96 are arranged on two opposite sides of the reduction gearbox housing 9 , and the second shaft hole 98 and the mounting shaft 56 are arranged on the same side of the reduction gearbox housing 9 .

[0111] Furthermore, in order to optimize the structural layout of the fan, the mounting shaft 56 and the output end of the transmission assembly 3 can be designed to be coaxial. The mounting shaft 56 is mounted on the reduction box housing 9, and the mounting shaft 56 and the first shaft hole 96 on the reduction box housing 9 can be processed together, so as to ensure the coaxiality of the mounting shaft 56 and the output end of the transmission assembly 3.

[0112] In the above embodiment, optionally, Figure 2 and Figure 3 As shown, the mounting column 1 includes: a mounting box 12, the mounting box 12 includes a mounting seat 122 and a decorative cover 124, and the mounting seat 122 and the decorative cover 124 enclose an installation space. The drive assembly 2, the transmission assembly 3 and the damping assembly 5 are installed in the installation space; the fan also includes a first rocker arm 6. One end of the first rocker arm 6 is connected to the output end of the secondary transmission structure 34, and the other end of the first rocker arm 6 is connected to the fan head 4. The rotating member 52 includes a second rocker arm 524, one end of the second rocker arm 524 is installed on the mounting column 1, and the other end of the second rocker arm 524 is connected to the fan head 4, and the second rocker arm 524 can rotate with the fan head 4. The first rocker arm 6 and the second rocker arm 524 are both located outside the mounting box 12, and are located on two opposite sides of the mounting box 12, and along the axial direction of the output end of the secondary transmission structure 34, a gap is set between the first rocker arm 6 and the second rocker arm 524 and the outer wall of the mounting box 12.

[0113] In this embodiment, the mounting column 1 includes a mounting box 12, which is surrounded by a mounting seat 122 and a decorative cover 124. The drive assembly 2, the transmission assembly 3 and the damping assembly 5 are installed in the mounting box 12, so that the drive assembly 2, the transmission assembly 3 and the damping assembly 5 can be installed into an assembly through the mounting box 12. At the same time, the outside of the mounting box 12 is symmetrically provided with a first rocker arm 6 and a second rocker arm 524, and the first rocker arm 6 and the second rocker arm 524 are both connected to the fan head 4 and connected to the parts in the mounting box 12. And the first rocker arm 6 and the second rocker arm 524 can both rotate. In order to avoid friction between the first rocker arm 6 and the second rocker arm 524 and the mounting box 12, a gap is set between the first rocker arm 6 and the second rocker arm 524 and the outer wall of the mounting box 12. In this structure, the drive assembly 2, the transmission assembly 3 and the damping assembly 5 are installed as a whole through an installation box 12, thereby optimizing the structural layout of the product.

[0114] In the above embodiment, optionally, Figure 2 As shown, when the fan head 4 rotates in the vertical plane, the axial direction of its rotation axis is the first axial direction (such as Figure 2 As shown), a receiving groove 42 is provided on the fan head 4, and limiting grooves 44 are respectively provided on two sides of the receiving groove 42 which are arranged opposite to each other along the first axial direction. The first rocker arm 6 and the second rocker arm 524 are correspondingly installed in the two limiting grooves 44 on both sides of the receiving groove 42.

[0115] In this embodiment, the first rocker arm 6 and the second rocker arm 524 can be limited by the limiting groove 44, so that the first rocker arm 6 and the second rocker arm 524 can be more reliably connected to the fan head 4. Furthermore, the first rocker arm 6 and the fan head 4, and the second rocker arm 524 and the fan head 4 are both connected by screws.

[0116] In the above embodiment, optionally, Fig.11 As shown, the fan head 4 can move between a first position A and a second position B on a vertical plane under the drive of the secondary transmission structure 34, and the torque generated by the damping assembly 5 in the opposite direction to the gravity torque of the fan head 4 increases from the first position A to the second position B. Optionally, when the fan head 4 is at the first position A, the angle between the fan head 4 and the horizontal direction is greater than or equal to negative 15° and less than or equal to 0°. Optionally, when the fan head 4 is at the second position B, the angle between the fan head 4 and the horizontal direction is greater than or equal to 60° and less than or equal to 85°.

[0117] In this embodiment, the pitch angle (rotation angle α) of the fan head 4 is set in the range of negative 15°-85°, and the angle can be limited by the first position A and the second position B. Generally, the first position A is close to the horizontal forward position of the fan head 4, and the second position B is close to the vertical upward position of the fan head 4. In the first position A, the torque generated by the damping assembly 5 is the largest, and in the second position B, the torque is the smallest. Furthermore, when the fan head 4 is vertically upward, it blows air in the vertical direction, the airflow flows closer, and the airflow is not easy to blow towards the user. Therefore, the present application limits the pitch angle to less than or equal to 85°. In this way, the situation where the fan blows air toward the ceiling can be avoided. In addition, when the user uses the fan, there is also a need to blow air downward. Therefore, the present application sets the pitch angle to a minimum of negative 15°, so that the pitch angle of the fan is more reasonable and can better meet the various needs of users.

[0118] In the above embodiment, optionally, Figure 1 As shown, the mounting column 1 further includes a first column 14, and the mounting box 12 is mounted on the first column 14. The mounting column 1 further includes a second column 16, and the second column 16 is rotatably connected to the first column 14. The first column 14 can rotate relative to the second column 16 to drive the fan head 4 to rotate in the horizontal plane. This arrangement allows the fan to not only adjust the pitch angle, but also adjust the horizontal orientation of the fan head 4, thereby expanding the air supply range of the fan.

[0119] Optionally, the mounting column 1 further includes a chassis 18, and the second column 16 is mounted on the chassis 18. The entire fan can be mounted on a platform such as the ground through the chassis 18. The provision of the chassis 18 increases the grounding area of ​​the fan, and can make the fan installation more stable.

[0120] Furthermore, if Figure 8 As shown, the reduction box housing 9 is provided with a plurality of (for example, 4) first screw holes 99, the first column is provided with a plurality of (for example, 4) first screw columns 1222, and the reduction box housing 9 and the first column are fastened with screws.

[0121] Furthermore, if Figure 2 and Figure 3 As shown, a plurality of (for example, 4) second screw columns 46 are provided on the fan head 4, and second screw holes are provided on the first rocker arm 6 and the second rocker arm 524, and the fan head 4 and the first rocker arm 6 as well as the fan head 4 and the second rocker arm 524 are all fixed by screws.

[0122] like Figure 6As shown, a wire outlet hole 922 is opened on the reduction box seat 92, a first center hole is set on the first rocker arm 6, and a second center hole is set on the secondary driven gear 344. The wire outlet hole 922 is connected with the first center hole and the second center hole. Wires such as power lines can pass through the wire outlet hole 922, the first center hole and the second center hole through the transmission component 3, the reducer housing and the two rocker arms.

[0123] Exemplarily, the motor is a stepper motor.

[0124] The fan in the present application is introduced below in conjunction with a specific embodiment.

[0125] A fan pitch mechanism was published in the relevant proposal. In this proposal, a small gear is installed on the pitch motor shaft, and an inner gear ring is meshed with the small gear. The pitch motor and the small gear are integrated and fixed on the fan body. The inner gear ring is rigidly connected to the fan head through some structural parts. The pitch movement of the fan head is realized through the relative movement between the gear ring and the gear ring.

[0126] Since the center of gravity of the fan head is a certain distance away from its rotation center, the pitch mechanism needs to overcome the torque formed by the gravity of the fan head. During the pitch action, this gravity torque is a variable value, and it reaches its maximum when the fan head is in a horizontal position. The heavier the fan head, the greater the torque the pitch motor needs to output. If the motor volume power density does not change much, a larger motor is required. The larger the motor, the more copper, iron, and magnetic steel are required, and the cost of the motor will be greater.

[0127] During the actual use of the fan, the fan head can complete the pitch movement, and some abnormal situations need to be considered. For example, if the fan head is moved up and down manually, in this case, the gear as the force transmission component will be subjected to strong external force. Since the pitch motor's own rotating shaft has a certain function of maintaining the angle position, it has a reverse damping effect on the gear. In this state, the force acting on the teeth of the gear and the gear ring is much greater than the force in the normal state. When the gears and gear rings are made of plastic, the teeth are prone to breakage, and metal gears and gear rings are required. Metal gears are generally made of casting or powder metallurgy, and the cost is much higher than plastic gears.

[0128] Based on the above cost analysis, choosing a smaller stepper motor with smaller output torque for the pitch motor can greatly reduce the cost. Replacing metal gears with plastic gears can also greatly reduce the cost.

[0129] Since the weight of the machine head has not changed, the motor will definitely not be able to carry the weight of the machine head after it becomes smaller, and the force transmission process needs to be further improved.

[0130] The original plan uses a gear and ring gear transmission, which can be increased to further increase the output torque of the reduction mechanism. If the two-stage transmission mechanism is still unable to drive the machine head, it is possible to consider further increasing the number of transmission stages. For example, a three-stage or four-stage gear transmission has the negative effect of increasing the machining accuracy of the parts, increasing the size of the reduction mechanism, and further reducing the output circumferential speed.

[0131] Based on the above cost analysis, choosing a smaller stepper motor with smaller output torque for the pitch motor can greatly reduce the cost. Replacing metal gears with plastic gears can also greatly reduce the cost.

[0132] Since the weight of the machine head has not changed, the motor will definitely not be able to carry the weight of the machine head after it becomes smaller, and the force transmission process needs to be further improved.

[0133] On the basis of the two-stage gear transmission, a torsion spring is considered to balance the weight of the machine head to offset the weight of the machine head.

[0134] The relationship between the fan's gravity moment M and spring torque T and the rotation angle α is as follows: Fig.12 As shown. Among them, Fig.12 In the coordinate system, the horizontal axis represents the rotation angle α of the fan head, and the vertical axis represents the magnitude of the torque. Fig.12 It can be seen that the spring torque T and the rotation angle α are basically linearly related, and the gravity torque M and the rotation angle α gradually decrease as the angle increases. When the rotation angle of the fan head relative to the horizontal plane is 0°, the gravity torque M is the largest, and its value is G×L. When the rotation angle of the fan head relative to the horizontal plane is π / 2, the gravity torque M is the smallest, and its value is basically 0. Fig.11 As shown, the weight of the fan head is G, the force arm of the gravity of the fan head is L, K is the elastic coefficient of the torsion spring, and α is the rotation angle.

[0135] Assuming that when the nose is horizontal, α=0, M=T, and the spring torque is just balanced with the gravity torque, then when the fan head is 90° upward, the gravity torque M and the spring torque T are both equal to zero.

[0136] Gravitational moment M = G × L × COSα (Formula 1)

[0137] Spring torque T = K × (π / 2-α) (Formula 2)

[0138] Torque difference M C =MT=G×L×COSα-K×(π / 2-α)=G×L×COSα+K×α-π / 2×K (Formula 3) is given by Fig.12 It can be seen that in the interval (0, π / 2), M C There is a maximum value, let M C =0, we get:

[0139] α max =arcsin((K / G)×L) (Formula 4)

[0140] If a fan head weighs G = 30N, the gravity arm L = 0.12m.

[0141] When horizontal, the gravity torque and the spring torque are just balanced.

[0142] It can be obtained that K=GL / (π / 2)=30×0.12×2 / π=2.2918.

[0143] α max =arcsin((K / G)×L)=arcsin((0.2918 / 30)×0.12)=0.69(radians, 39.53958°).

[0144] M Cmax =30×1.2×0.7711778+2.2918×0.69-3.1415926 / 2×2.2918

[0145] =0.757631Nm (Newton per meter).

[0146] α max The angle value at which the stepper motor needs to provide maximum torque during the operation of the fan head.

[0147] M Cmax It is the maximum torque required during the operation of the fan head.

[0148] In actual parts assembly, it is necessary to consider friction loss and the high viscosity damping grease used inside the reduction gearbox. This part of the loss is calculated as 20%.

[0149] M C机 =M Cmax / 0.8=0.947Nm.

[0150] M C机 The torque required for the fan head to pitch smoothly.

[0151] Considering that the fan head can stay at any angle within its pitch range, the holding torque Mb of the stepper motor is used as the basis for calculation.

[0152] Based on the current price and holding torque of small stepper motors for household appliances, if the holding torque of the stepper motor is 0.15Nm, since the output torque of the stepper motor at low speed is close to the holding torque, the holding torque value is used for calculation, and 1 / 3 design margin is reserved. Then the output torque of the stepper motor is calculated as M e=0.15×2 / 3=0.1Nm, the required reduction ratio of the reduction gearbox is i=M e :M C机 =0.1:0.947≈1:10.

[0153] After knowing the reduction ratio of the reduction box, you can start designing the reduction box by referring to the internal space that the fan can provide and the appearance.

[0154] The reduction box adopts one-stage gear reduction. The large gear is 10 times larger than the small gear, and the space requirement is large. If two-stage gear reduction is adopted, the diameter ratio of the large and small gears can be arranged at about 1:3.3, and the occupied space will be greatly reduced. Therefore, it is appropriate to adopt a two-stage gear reduction scheme. The disadvantages of using more stages of gear transmission have been described in the previous article.

[0155] The plastic material of the gear can be selected from the following materials: POM (polyformaldehyde, thermoplastic crystalline polymer), nylon 6 (PA6), nylon 66 (PA66) + 30GF (glass fiber).

[0156] The respective properties of the three materials are shown in Table 1 below.

[0157] Table 1

[0158] tensile strength Yield Strength Shear strength Bending Strength POM 60~80MPa 50~70MPa 50~80MPa 80~120MPa PA6 >60MPa(dry) 70MPa(23°) 50-80MPa 50-150MPa PA66+30GF 145 >130MPa >160MPa >160MPa

[0159] It can be seen from Table 1 that the performance of POM is poor. Therefore, in the subsequent calculation process, the value of POM is used as an example for relevant calculations.

[0160] Since the pinion is generally designed with a small number of teeth, the width at the root of the tooth is often larger than the graduation circle (such as Fig.13 Tooth width C on the pitch circle C1) b (arc length on the pitch circle) is small, according to 0.8×C b In addition, the root of the gear will have a small fillet to eliminate stress concentration, so 0.8×C b It is possible to estimate.

[0161] The function of the reduction box is to transfer the output torque of the motor to the machine head. Since the friction loss has been considered above, the output torque of the stepper motor can be used to calculate the force on the gear. In addition, the output torque of the stepper motor at low speed is close to the holding torque. Therefore, T = 0.1Nm is used as the torque value transmitted by the gear.

[0162] In addition, during the gear meshing process, two teeth may be in contact at the same time. To simplify the calculation, it is considered as a single tooth contact, which also leaves a certain safety margin. The gear parameters are selected as module m = 1, tooth top height = tooth root height = 1, and top clearance C = 0.35.

[0163] Then the maximum tensile stress at the tooth root σ=T×(0.8×C b / 2) / I Z (Formula 5)

[0164] Where σ=60MPa (taking the minimum tensile strength of POM)

[0165] T=0.1Nm

[0166] C b =m×pi / 2=0.00157

[0167] I Z =w×(0.8×C b )^3 / 12(I Z is the moment of inertia at the tooth root, w is the tooth thickness)

[0168] Substituting into formula 5, we obtain w = 0.000528 (meters).

[0169] It can be seen from this that if POM material is used for the first-stage pinion, a tooth thickness of less than 1 mm is required to meet the force transmission requirements.

[0170] Circumferential shear stress at tooth root:

[0171] σ 周 =T / (m×2.35 / 1000) / (w×0.8×C b ×2) (Formula 6)

[0172] σ 周 =50MPa

[0173] m=1

[0174] C b =0.00157

[0175] Substituting this into the equation, we obtain w = 0.000339 (meters). It can be seen that the circumferential shear stress only requires a tooth thickness of less than 1 mm.

[0176] Shear stress on the neutral layer at the tooth root:

[0177] Since the rectangular cross section σ 中 =1.5σ 周 (Formula 7)

[0178] Substituting into (Formula 6), we get w = 0.0005085. It can be seen that the neutral layer shear stress only requires a tooth thickness of less than 1 mm. Therefore, in actual gear design, the minimum tooth thickness can be designed to be 1 mm.

[0179] The standard gear pressure angle is 20°. Therefore, Fig.13As shown, the angle between the pressure line L1 and the horizontal line is 70°. When the gear system actually transmits force, there will be a part of the radial force, which is the compressive stress and points to the axis of the gear. Therefore, after ignoring this part in the calculation of (Formula 5), ​​a certain safety factor is reserved. Since the compressive strength of the material is generally much higher than the tensile strength, the stress on the compressive side of the neutral layer is not calculated using (Formula 5).

[0180] Since nylon can be reinforced by adding fibers, greatly improving its mechanical properties, it is feasible to replace metal gears with plastic gears.

[0181] Based on the above analysis, the present application proposes a fan having the following characteristics:

[0182] 1. The electric fan pitch mechanism is driven by a stepper motor, through a two-stage gear reduction box, and uses a torsion spring to balance the weight of the machine head.

[0183] 2. The overall reduction ratio of the reduction box is 1:10 or the overall reduction ratio of the reduction box is within the range of 1:7 to 1:13.

[0184] 3. The free state of the torsion spring is the vertical upward position of the machine head, and the maximum torque position of the torsion spring is the limit position of the downward movement of the machine head. In general, the limit position of the downward movement is the horizontal forward position of the machine head.

[0185] 4. With the fan head pointing horizontally forward at 0°, the fan head can pitch in the range of -15° to 85°, or any interval within this range.

[0186] If the center of gravity of the fan head 4 is a certain distance from the vertical plane of gravity where the rotation axis is located, a torsion spring can be used to balance the gravity of the head, so that it can pitch and shake at any angle from horizontal to vertical 90°. After setting up a one- or two-stage reduction gearbox, a motor with a smaller output torque can be selected as the power source for the pitch action. This can greatly reduce costs.

[0187] like Figures 1 to 11 As shown, the fan of this embodiment includes a fan head 4 and a column (including a chassis 18), a left and right shaking mechanism and a pitch mechanism. The left and right shaking mechanism is built into the column, and the pitch mechanism is built into the connection between the fan head 4 and the column. The column includes a lower column (a first column 14) and an upper column (a second column 16).

[0188] Among them, Figure 2 and Figure 3As shown, the decorative cover 124 in front of the upper column can be assembled into a whole with the pitch mechanism and the upper column. The pitch mechanism includes a left rocker arm (first rocker arm 6) and a right rocker arm (second rocker arm 524), which are fastened to the fan head 4 by screws. It can be seen that there is a second screw hole on the left rocker arm, and similarly, there is also a second screw hole on the right rocker arm, as shown in FIG. Figure 3 As shown, there is a second screw column 46 on the fan head 4, and the two rocker arms are fixed to the fan head 4 by screws, thereby realizing the connection between the fan head 4 and the upper column.

[0189] like Figure 8 As shown, there are four first screw holes 99 on the pitch mechanism and four first screw columns 1222 on the upper column. The two are fastened with screws to fix the pitch mechanism on the upper column.

[0190] like Figure 5 As shown, the reduction gear is located inside the reduction box seat 92 and the reduction box cover 94. Figure 2 As shown in the figure, the left rocker arm and the right rocker arm are located on both sides of the reduction gearbox. Figure 4 As shown in the figure, the pitch motor is located on the surface of the reduction box. Figure 4 As shown, a wire outlet hole 922 is opened on the reduction box seat 92.

[0191] like Figure 5 and Figure 6 As shown, the pitch mechanism includes a reduction gear cover 94, a reduction gear seat 92, a left rocker arm, a right rocker arm, a spring, a spring sleeve, a pitch motor, a primary driving gear 322, an intermediate gear, and a secondary driven gear 344, wherein the intermediate gear is a part in which two gears are integrated, including a primary driven gear 324 and a secondary driving gear 342.

[0192] like Figure 6 and Figure 7 As shown, the two ends of the spring have a left tail and a right tail (i.e., a first tail end 542 and a second tail end (544), respectively. The reduction box seat 92 has a tail groove (a second tail groove 566), and the left tail of the spring is placed in the tail groove to constrain the spring and prevent it from rotating.

[0193] like Figure 6 and Figure 7 As shown, there is a tail groove (first tail groove 5222) on the spring sleeve (shaft sleeve 522), and the right tail of the spring is placed in the tail groove. When the spring sleeve rotates, the spring is driven to twist through the tail groove. The spring sleeve has a central circular hole and a rotating ring, which respectively cooperate with the rotating shaft and the rotating static ring on the reduction box seat 92.

[0194] like Figure 6 As shown, the wire outlet hole 922 on the reduction box seat 92 is connected with the central wire hole and the central wire hole on one side of the left rocker arm, and the wire can pass through the pitch mechanism.

[0195] The fan further comprises an outer cover 7. When the mounting box 12 and its internal parts, as well as the rocker arms and fan heads 4 on both sides thereof are mounted (such as Fig.10 After that, the outer cover 7 (as shown) can be covered. Fig. 9 As shown), so as to avoid the installation box 12 being directly exposed to the outside.

[0196] In the description of this specification, the terms "connection", "installation", "fixation" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0197] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0198] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fan, characterized in that: include: Mounting columns; A drive assembly mounted on the mounting post; A transmission assembly, comprising a primary transmission structure and a secondary transmission structure, wherein an input end of the primary transmission structure is connected to the drive assembly, and an output end of the primary transmission structure is connected to an input end of the secondary transmission structure; The fan head is rotatably mounted on the mounting column, connected to the output end of the secondary transmission structure, and can rotate in a vertical plane under the drive of the output end of the secondary transmission structure; The damping assembly is mounted on the mounting column and can be elastically deformed to generate a moment in the opposite direction to the gravity moment of the fan head.

2. The fan according to claim 1, characterized in that The transmission component is a plastic component; and / or the drive component includes a motor.

3. The fan according to claim 1, characterized in that: The primary transmission structure is a POM part or a nylon part, and the secondary transmission structure is a POM part or a nylon part.

4. The fan according to claim 1, characterized in that: The reduction ratio of the transmission assembly is greater than or equal to 1:13 and less than or equal to 1:7; and / or The reduction ratio of the primary transmission structure is greater than or equal to 1:3.6 and less than or equal to 1:2.5, and the reduction ratio of the secondary transmission structure is greater than or equal to 1:3.6 and less than or equal to 1:2.

5.

5. The fan according to claim 1, characterized in that: The primary transmission structure comprises a primary driving gear connected to the driving assembly and a primary driven gear meshing with the primary driving gear; The secondary transmission structure includes a secondary driving gear connected to the primary driven gear and a secondary driven gear meshing with the secondary driving gear; The fan head is drivingly connected to the secondary driven gear.

6. The fan according to claim 5, characterized in that: The primary driven gear is coaxially arranged with the secondary driving gear.

7. The fan according to claim 5, characterized in that The primary driven gear and the secondary driving gear are an integrated structure, or the primary driven gear is drivingly connected to the secondary driving gear; and / or The tooth thickness of the primary driving gear is greater than or equal to 1 mm; and / or The primary driving gear, the primary driven gear, the secondary driving gear and the secondary driven gear are at least one of a POM gear and a nylon gear.

8. The fan according to claim 5, characterized in that The secondary driven gear comprises a meshing portion meshing with the secondary driving gear, and a driven shaft arranged on the meshing portion; The fan comprises a first rocker arm, one end of which is connected to the driven shaft, and the other end of which is connected to the fan head.

9. The fan according to claim 1, characterized in that: The damping assembly comprises: A rotating member is installed on the mounting column and connected to the fan head. When the fan head rotates in a vertical plane, it can drive the rotating member to rotate; The torsion spring can be torsionally deformed when the rotating member rotates following the fan head, so as to generate a moment in the opposite direction to the gravity moment of the fan head.

10. The fan according to claim 9, characterized in that The damping assembly further comprises a mounting shaft mounted on the mounting column, the rotating member comprises a shaft sleeve, the shaft sleeve is rotatably sleeved and mounted on the mounting shaft, the torsion spring is mounted between the mounting shaft and the shaft sleeve, the shaft sleeve is provided with a first tail groove, and the first tail end of the torsion spring is mounted in the first tail groove; The rotating member also includes a second rocker arm, one end of the second rocker arm is connected to the fan head, and the other end of the second rocker arm is connected to the shaft sleeve. The second rocker arm can rotate with the shaft sleeve and drive the rotating member to rotate.

11. The fan according to claim 10, characterized in that The mounting shaft comprises a shaft body and a first sleeve mounted outside the shaft body, wherein at least a portion of the first sleeve is connected to the shaft body, the first sleeve and the shaft body form an annular mounting groove, the torsion spring is at least partially mounted in the annular mounting groove, the first sleeve is provided with a second tail groove, and the second tail end of the torsion spring extends out of the second tail groove; A second ring is provided at one end of the shaft sleeve close to the first ring, and the second ring is rotatably sleeved on the first ring; One end of the sleeve away from the first collar is rotatably mounted on the shaft body.

12. The fan according to claim 10, characterized in that Also includes: A reduction box housing, used to accommodate the transmission assembly, the reduction box housing is provided with a first shaft hole and a second shaft hole, the output end of the secondary transmission structure extends out from the first shaft hole, and the input end of the primary transmission structure extends out from the second shaft hole; The driving assembly is located outside the reduction gearbox housing; The mounting shaft is located outside the reduction gearbox housing and is mounted on the reduction gearbox housing.

13. The fan according to claim 12, characterized in that The mounting shaft is coaxial with the output end of the secondary transmission structure, the mounting shaft and the first shaft hole are arranged on two opposite sides of the reduction gearbox housing, and the second shaft hole and the mounting shaft are arranged on the same side of the reduction gearbox housing.

14. The fan according to claim 9, characterized in that The mounting column comprises: An installation box, the installation box comprising a mounting seat and a decorative cover, the mounting seat and the decorative cover enclosing an installation space; The driving assembly, the transmission assembly and the damping assembly are installed in the installation space; The fan further comprises a first rocker arm, one end of the first rocker arm is connected to the output end of the secondary transmission structure, and the other end of the first rocker arm is connected to the fan head; The rotating member comprises a second rocker arm, one end of the second rocker arm is mounted on the mounting column, the other end of the second rocker arm is connected to the fan head, and the second rocker arm can rotate with the fan head; The first rocker arm and the second rocker arm are both located outside the installation box and on two opposite sides of the installation box, and gaps are provided between the first rocker arm and the second rocker arm and the outer wall of the installation box.

15. The fan according to claim 14, characterized in that When the fan head rotates in a vertical plane, the axial direction of its rotation axis is a first axial direction. A receiving groove is provided on the fan head. Limiting grooves are respectively provided on two sides of the receiving groove that are opposite to each other along the first axial direction. The first rocker arm and the second rocker arm are limit-mounted in the two limiting grooves on both sides of the receiving groove in a one-to-one correspondence.

16. The fan according to any one of claims 1 to 15, characterized in that The fan head can move between a first position and a second position on a vertical plane under the drive of the secondary transmission structure, and the moment generated by the damping assembly in a direction opposite to the gravity moment of the fan head increases from the first position to the second position; When the fan head is at the first position, the angle between the fan head and the horizontal direction is greater than or equal to negative 15° and less than or equal to 0°; When the fan head is in the second position, the angle between the fan head and the horizontal direction is greater than or equal to 60° and less than or equal to 85°.

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