Power device and clothes drying equipment

Abstract

The utility model discloses a power device and a clothes drying device, belonging to the technical field of power devices. The power device can be used for electric household appliances, the power device includes a motor, a reduction assembly and an output wheel, the motor includes a motor shaft, the reduction assembly includes a first transmission structure fixedly connected to the motor shaft, a second transmission structure transmission-connected to the first transmission structure, a third transmission structure fixedly connected to the second transmission structure, and a fourth transmission structure transmission-connected to the third transmission structure, the output wheel is fixedly connected to the fourth transmission structure; wherein, output wheels are respectively provided on both sides of the motor shaft. The clothes drying device includes the aforementioned power device, and also includes a drying rod and a connecting line for connecting the output wheel of the power device and the drying rod. The utility model improves the output torque of the output end of the power device by the reduction assembly, thereby improving the load-bearing capacity; output wheels are provided on both sides of the motor shaft, which can evenly and stably load the load. The clothes drying device can meet greater drying needs.

Description

Technical Field

[0001] The utility model relates to the technical field of power devices, in particular to a power device and a clothes drying device. Background Art

[0002] Electric devices such as electric clothes drying equipment and electric curtains are equipped with motors, which drive the load to rise or fall or rotate. However, in the related art, when the motor needs to drive a heavier load, it is usually necessary to increase the power of the motor, which will increase the size of the motor or increase the cost of the motor. The increase in the size of the motor will increase the size of the entire device host, which is not conducive to the miniaturization design of smart home devices. Utility Model Content

[0003] The purpose of the embodiments of the utility model is to provide a power device and a clothes drying device, the load-bearing capacity of which is improved.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A power device, which can be used for electric household equipment, comprises:

[0006] a motor having a motor shaft;

[0007] A reduction assembly, comprising a first transmission structure fixedly connected to the motor shaft, a second transmission structure transmission-connected to the first transmission structure, a third transmission structure fixedly connected to the second transmission structure, and a fourth transmission structure transmission-connected to the third transmission structure;

[0008] An output wheel, fixedly connected to the fourth transmission structure;

[0009] In which, the output wheels are arranged on both sides of the motor shaft, the number of the fourth transmission structures in the reduction assembly is consistent with the number of the output wheels, the number of the third transmission structures is consistent with the number of the fourth transmission structures, and the number of the second transmission structures is consistent with the number of the third transmission structures.

[0010] Optionally, a transmission ratio between the first transmission structure and the second transmission structure is greater than 1, and a transmission ratio between the third transmission structure and the fourth transmission structure is greater than 1;

[0011] The first transmission structure is a worm, the second transmission structure is a worm wheel, the third transmission structure is a first spur gear, and the fourth transmission structure is a second spur gear; the worm wheel meshes with the worm, and the second spur gear meshes with the first spur gear.

[0012] Optionally, the motor is a brushed DC motor;

[0013] The worm is an Archimedean worm or an involute cylindrical worm;

[0014] The rotation axis of the motor shaft and the first transmission structure is the first axis, the rotation axis of the second transmission structure and the third transmission structure is the second axis, and the rotation axis of the fourth transmission structure and the output wheel is the third axis; the first axis and the second axis are skewed and staggered, and the third axis is parallel to the second axis;

[0015] The motor shaft and the worm are an integrally formed structure, the second transmission structure and the third transmission structure are an integrally formed structure, and the fourth transmission structure and the output wheel are an integrally formed structure.

[0016] Optionally, a spacer is provided between the worm gear and the first spur gear;

[0017] The worm gear, the spacer, and the first spur gear are an integrally formed structure;

[0018] The diameter of the addendum circle of the first spur gear is smaller than or equal to the diameter of the spacer.

[0019] Optionally, the speed ratio of the second transmission structure to the first transmission structure is a first speed ratio, the speed ratio of the fourth transmission structure to the third transmission structure is a second speed ratio; the speed ratio of the reduction assembly is a total speed ratio;

[0020] The total speed ratio is the product of the first speed ratio and the second speed ratio, and the total speed ratio is between 145 and 165;

[0021] A ratio of the first speed ratio to the second speed ratio is between 4.2 and 8.2.

[0022] Optionally, the number of starts of the worm is Z1, the number of teeth of the worm wheel is Z2, the number of teeth of the first spur gear is Z3, and the number of teeth of the second spur gear is Z4;

[0023] Z1 is 1, Z2 is between 29 and 33, Z3 is between 9 and 13, and Z4 is between 53 and 57.

[0024] Optionally, the transmission efficiency of the motor is η1, the transmission efficiency of the reduction assembly is η2, the transmission efficiency of the power device is η3, and the transmission efficiency of the power device is the product of the transmission efficiency of the motor and the transmission efficiency of the assembly;

[0025] η1 is between 0.63 and 0.74; η2 is between 0.63 and 0.74; η3 is between 0.441 and 0.592.

[0026] Optionally, the diameter of the worm is d1, the addendum diameter of the worm wheel is d2, the addendum diameter of the first spur gear is d3, and the addendum diameter of the second spur gear is d4;

[0027] The ratio of d2 to d1 is between 2.6 and 3.0;

[0028] The ratio of d3 to d2 is between 0.5 and 0.9;

[0029] The ratio of d4 to d3 is between 3.8 and 4.2.

[0030] A clothes drying device, comprising the power device of the above solution, and also comprising a clothes drying rod and a connecting line;

[0031] Connecting wires are respectively arranged at both ends of the drying rod, and the connecting wires connected to the two ends of the drying rod are respectively wound around the two output wheels; the power device is used to drive the drying rod to rise and fall through the output wheels.

[0032] Optionally, the weight carried by the power device is m, the input torque of the motor (10) is T, the reduction ratio of the reduction assembly is i 3, the total efficiency of the power device is η3, and the radius of the output wheel (60) is r;

[0033] T = mg (r / η3) / i 3;

[0034] When m is 60KG, i 3 is 155, η3 is between 0.441 and 0.592, and r is between 26mm and 28mm, T is between 167mNm and 241mNm;

[0035] When m is 65KG, i 3 is 155, η3 is between 0.441 and 0.592, and r is between 26mm and 28mm, T is between 180mNm and 261mNm.

[0036] The beneficial effects of the utility model are as follows: the power device and the clothes drying device including the power device increase the output torque of the output end of the power device through the deceleration component, thereby increasing the load capacity of the entire power device and reducing the requirements for motor selection; and output wheels are arranged on both sides of the motor shaft, and the power device can output torque through the two output wheels, which can load evenly and stably, and is conducive to increasing the load capacity. The clothes drying device can meet greater drying needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The utility model is further described in detail below based on the drawings and embodiments.

[0038] Figure 1 This is a schematic diagram of the structure of the power device according to an embodiment of the utility model;

[0039] Figure 2 It is a partial structural schematic diagram of the power device described in the embodiment of the utility model;

[0040] Figure 3 for Figure 2 A magnified view of part A in FIG.

[0041] Figure 4 A diagram showing the coordination relationship between the second transmission structure, the spacer, the third transmission structure and the fourth transmission structure in the power device according to an embodiment of the utility model;

[0042] Figure 5 This is an exploded schematic diagram of the power device according to an embodiment of the utility model;

[0043] Figure 6 It is a structural schematic diagram of components including a second transmission structure, a spacer, and a third transmission structure in the power device according to an embodiment of the utility model;

[0044] Figure 7 This is a schematic structural diagram of a clothes drying device according to an embodiment of the utility model;

[0045] In the figure: 10, motor; 11, motor shaft; 20, first transmission structure; 30, second transmission structure; 40, third transmission structure; 50, fourth transmission structure; 60, output wheel; 70, spacer; 100, first component; 200, second component; 300, third component; 91, first axis; 92, second axis; 93, third axis; 81, main machine; 82, connecting line; 83, drying rod. DETAILED DESCRIPTION

[0046] In order to make the technical problems solved by the utility model, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0047] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected" and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0049] Smart home devices such as electric clothes drying equipment and electric windows are equipped with motors, which drive the load to rise or fall or rotate. However, in the related art, when the motor needs to drive a heavier load, it is usually necessary to increase the power of the motor, which will increase the size of the motor or the cost of the motor. The increase in the size of the motor will increase the size of the entire device host, which is not conducive to the miniaturization design of smart home devices. For example, the maximum load-bearing capacity of existing electric clothes drying equipment is 45KG, but for users who need to dry a large amount of clothes or need to dry heavy clothes, electric clothes drying equipment with a maximum load of 45KG cannot meet the drying needs.

[0050] Based on this, Figures 1 to 7 As shown, the present application provides a power device, which is applied to an electric clothes drying device or other smart home devices. The electric clothes drying device or other smart home devices using the power device have high load-bearing performance and can carry a weight greater than 45KG.

[0051] In some embodiments, the power device of the present application is applied to an electric clothes drying machine, which can carry and lift 60KG of clothes, thereby meeting large load requirements.

[0052] Of course, the power device of the present application can also be applied to other electric household appliances, such as electric curtains, electric doors, electric windows, electric lifting chandeliers and other electric appliances. For curtains, doors, windows and other objects waiting to be driven by the power device, even if the weight of the object is heavy, the power device can efficiently and stably drive the object to rise or fall or rotate. For example, a heavy electric door used in a villa can also be driven to rotate by the power device of the present solution.

[0053] The present application also provides an electric clothes drying device, which adopts the aforementioned power device, can meet the needs of large-weight drying, and has a wider range of applications.

[0054] Please refer to Figures 1 to 7 , the power device and the electric clothes drying equipment are explained below by taking the application of the power device to the electric clothes drying equipment as an example.

[0055] The power device includes a motor 10, a reduction assembly and an output wheel 60, and the motor 10 is coupled with the output wheel 60 through the reduction assembly. The power device is used to drive the load to rise or fall or rotate. For the power device, the motor shaft 11 of the motor 10 is the power input end, and the output wheel 60 is the power output end. The reduction assembly is used to amplify the torque of the input end, thereby increasing the torque of the output end, thereby increasing the load that the power device can bear.

[0056] like Figure 7 As shown, the electric clothes drying device includes a main unit 81, in which a power device is arranged, and the clothes drying device also includes a clothes drying rod 83 and a connecting wire 82. The connecting wires 82 are arranged at both ends of the clothes drying rod 83, and the connecting wires 82 connected to both ends of the clothes drying rod 83 are respectively wound around the output wheels 60 on both sides of the motor shaft 11. The clothes drying rod 83 is used to hang clothes. The motor 10 is used to drive the output wheel 60 to rotate through the reduction assembly, and the output wheel 60 can realize the winding and unwinding of the connecting wire 82 by rotation. The winding and unwinding of the connecting wire 82 can drive the clothes drying rod 83 to rise or fall. In other words, the power device is used to drive the clothes drying rod 83 to rise and fall through the output wheel 60. Among them, the load that the power device needs to bear is the weight of the clothes drying rod 83, the clothes drying on the clothes drying rod 83, etc. The use of a two-stage transmission reduction assembly can increase the torque at the output end, thereby increasing the load that the power device of the electric clothes drying device can bear, and meet the demand for heavy weight clothes drying.

[0057] The motor 10 includes a motor body 10 and a motor shaft 11, and the motor shaft 11 is used to output power. Output wheels 60 are arranged on both sides of the motor shaft 11. The input end of the power device is the motor shaft 11, and the output end is two output wheels 60.

[0058] The reduction assembly includes a first transmission structure 20, a second transmission structure 30, a third transmission structure 40 and a fourth transmission structure 50. The first transmission structure 20 is fixedly connected to the motor shaft 11, and the motor shaft 11 can drive the first transmission structure 20 to rotate synchronously. The second transmission structure 30 is fixedly connected to the third transmission structure 40, and the second transmission structure 30 can drive the third transmission structure 40 to rotate synchronously. The fourth transmission structure 50 is fixedly connected to the output wheel 60, and the fourth transmission structure 50 can drive the output wheel 60 to rotate synchronously.

[0059] There are two-stage transmission connections in the reduction assembly, the second transmission structure 30 is connected to the first transmission structure 20, and the fourth transmission structure 50 is connected to the third transmission structure 40. The transmission ratio of the second transmission structure 30 to the first transmission structure 20 is greater than 1, realizing the first stage reduction transmission; the transmission ratio of the fourth transmission structure 50 to the third transmission structure 40 is greater than 1, realizing the second stage reduction transmission. Through the two-stage reduction transmission, the torque can be increased.

[0060] Among them, the transmission ratio is the ratio of the angular velocities of the two rotating components in the mechanism, also known as the speed ratio. The transmission ratio of component a and component b is i=ωa / ωb, where ωa and ωb are the angular velocities of component a and b respectively (radians / second). For meshing transmission, the transmission ratio can be represented by the number of teeth Za and Zb of wheels a and b, i=Zb / Za. A transmission ratio greater than 1 means that the output speed is less than the input speed, thereby achieving the purpose of reducing the output speed and increasing the output torque to meet higher load requirements. A transmission ratio of the second transmission structure 30 to the first transmission structure 20 greater than 1 means that for every rotation of the second transmission structure 30, the first transmission structure 20 needs to rotate more than 1 circle.

[0061] The power device of the present application has at least the following advantages:

[0062] First, a reduction assembly is provided between the motor 10 and the output wheel 60. When the power device has high load-bearing requirements, the output torque of the output end of the power device can be increased through the reduction assembly, thereby improving the load-bearing capacity of the entire power device and reducing the requirements for the selection of the motor 10, thereby avoiding the need to greatly increase the rated working torque of the motor 10 in order to improve the load-bearing capacity of the clothes drying equipment.

[0063] Second, output wheels 60 are provided on both sides of the motor shaft 11. When the power device is applied to electric household appliances such as clothes drying equipment, the power device can output torque through the two output wheels 60, so that the power device can apply power to the target object from different positions, thereby being able to bear the weight of the target object more evenly, thereby allowing the power device to carry the target object more efficiently and stably, effectively improving the load-bearing capacity of the power device.

[0064] At the same time, by having the two output wheels 60 bear the load weight respectively, the wear and loss of each output wheel 60 can be reduced, thereby extending the service life of the output wheel 60.

[0065] When the power device is applied to the electric clothes drying device, the target objects are the clothes drying rod 83 and the clothes on the clothes drying rod 83, and the connecting ropes at both ends of the clothes drying rod 83 are reeled and unreeled by the output wheel 60 to drive the clothes drying rod 83 to rise and fall. The electric clothes drying device can hang heavier and more clothes, thereby maintaining stable operation.

[0066] Third, at least two stages of transmission are used in the reduction assembly. This multi-stage reduction transmission method allows the output speed of the motor 10 to be gradually reduced and the torque to be gradually increased, thereby ensuring the stability of the power device during operation.

[0067] In the electric clothes drying equipment, the design of at least two-stage reduction transmission in the reduction assembly and the double-sided output wheels 60 in the power device ensures the stability of the force on the left and right ends of the drying rod 83 during the winding and unwinding of the connecting line 82 and the lifting and lowering of the drying rod 83. It not only increases the output torque to increase the load-bearing capacity of the drying rod 83, but also avoids shaking or jumping of the drying rod 83 during the lifting and lowering process.

[0068] In one embodiment, the first transmission structure 20 is a worm, the second transmission structure 30 is a worm wheel, the third transmission structure 40 is a first spur gear, and the fourth transmission structure 50 is a second spur gear.

[0069] The motor shaft 11 is fixed to the worm, the first spur gear is fixed to the second spur gear, and the second spur gear is fixed to the output wheel 60. The worm is meshed with the worm wheel, and the worm and worm wheel transmission is a primary reduction transmission; the first spur gear is meshed with the second spur gear, and the two spur gears are a secondary reduction transmission.

[0070] Optionally, see Figure 5 The rotation axis of the motor shaft 11 and the first transmission structure 20 is the first axis 91, the rotation axis of the second transmission structure 30 and the third transmission structure 40 is the second axis 92, and the rotation axis of the fourth transmission structure 50 and the output wheel 60 is the third axis 93. Figure 5 In the drawing, the second axis 92 and the third axis 93 are axes perpendicular to the paper surface. The first axis 91 and the second axis 92 are not in the same plane and are staggered, and the third axis 93 and the second axis 92 are parallel and spaced apart.

[0071] The first stage reduction transmission adopts the cooperation of worm and worm wheel, which can change the direction of the rotation axis on the one hand, so that the worm wheels on both sides can be driven to rotate at the same time by one worm, thereby realizing the rotation of the output wheels 60 on both sides, reducing the number of the first transmission structure 20, and making the structure more compact; on the other hand, the reduction transmission of the worm and worm wheel can achieve a larger transmission ratio, usually between 8-100, which can effectively improve the output torque. The worm and worm wheel transmission has stable transmission and good self-locking performance. In the electric clothes drying device, when the motor 10 stops working but clothes are still hung on the clothes drying rod 83, if sufficient external force is not provided, it is difficult for the worm wheel to reversely drive the worm to rotate, and the electric clothes drying device can stably carry clothes.

[0072] The second-stage reduction transmission adopts the transmission cooperation of two spur gears, which has the advantages of simple structure, high transmission efficiency, and strong load-bearing capacity. The reduction transmission between the two spur gears can be further used to further refine or adjust the reduction ratio to meet the specific requirements of the electric clothes dryer for the rotation speed and output torque of the output wheel 60.

[0073] The two-stage reduction transmission method of this embodiment can provide a more stable transmission effect and improve the output torque while keeping the structure as compact as possible.

[0074] In other embodiments, the first transmission structure 20 and the second transmission structure 30 are both bevel gears, which are also called bevel gears. The transmission cooperation between the bevel gears can change the direction of the rotation axis; the third transmission structure 40 and the fourth transmission structure 50 are both spur gears, where bevel gears are also called bevel gears. Alternatively, the first transmission structure 20, the second transmission structure 30, the third transmission structure 40, and the fourth transmission structure 50 are all spur gears.

[0075] For the convenience of description, the following embodiments are described with the first transmission structure 20 being a worm, the second transmission structure 30 being a worm wheel, the third transmission structure 40 being a first spur gear, and the fourth transmission structure 50 being a second spur gear.

[0076] Optionally, the motor 10 uses a brushed DC motor 10, which is more than 30% more efficient than a conventional AC motor 10. Under the same energy consumption, the brushed DC motor 10 can provide more powerful power to meet high load requirements. In the brushed DC motor 10, the brush contacts the commutator, which is beneficial to improving the output torque of the motor 10.

[0077] In other embodiments, the motor 10 may also be an AC motor 10 or a brushless motor 10 .

[0078] The worm can be divided into many types according to its tooth profile curve. In one embodiment, the worm is an Archimedean worm or an involute cylindrical worm. The Archimedean worm has the advantages of large reduction ratio, smooth operation, quietness and easy matching. Among them, due to its rolling friction properties, the Archimedean worm transmission is quieter than other transmission methods. The tooth shape of the Archimedean worm can be processed and manufactured by adjusting the tool profile, so it is easier to match special-shaped and irregular profiles. The involute cylindrical worm has high transmission efficiency, and its friction and heat loss during the transmission process are small. Its transmission efficiency is as high as more than 90%, which is more than 15% higher than that of ordinary worms; and because its worm tooth shape changes smoothly and the friction area is small, the transmission noise is low.

[0079] In one embodiment, the worm is a single-start worm. In other embodiments, the worm may also be a double-start worm.

[0080] In one embodiment, referring to Figure 1 , Figure 2 , Figure 5, the motor shaft 11 and the worm are an integrally formed structure, forming a first component 100. The second transmission structure 30 and the third transmission structure 40 are an integrally formed structure, forming a second component 200. The fourth transmission structure 50 and the output wheel 60 are an integrally formed structure, forming a third component 300. In this embodiment, the two-stage reduction transmission between the motor 10 and the output wheel 60 can be realized by two transmission cooperations between the three components. On the one hand, the number of components and the number of assemblies can be reduced by an integrally formed manner, thereby reducing the efficiency reduction caused by the assembly errors between the components, which is conducive to improving the load capacity of the power device and the electric clothes drying equipment; on the other hand, the force transmission efficiency between the motor shaft 11 and the worm, between the worm wheel and the first spur gear, and between the second spur gear and the output wheel 60 is higher, reducing the loss and stress concentration, not only can it carry a larger weight, but also can improve the life of the power device under the condition of a large load.

[0081] In other embodiments, the motor shaft 11 and the worm, the second transmission structure 30 and the third transmission structure 40, and the fourth transmission structure 50 and the output wheel 60 may also be fixedly connected by welding, fasteners, etc., as long as the torque can be transmitted.

[0082] In one embodiment, please refer to Figure 1 , Figure 2 , Figure 5 The worm wheel and the first spur gear are coaxially arranged, and the pitch circle diameter of the worm wheel is larger than the pitch circle diameter of the first spur gear. This configuration is conducive to achieving a larger transmission ratio between the worm wheel and the worm to increase the output torque. The pitch circle interval between the worm wheel and the first spur gear also reduces the mutual interference or influence that may occur between the two-stage transmission, and the speed reduction assembly runs more stably.

[0083] Optionally, the tooth bottom circle of the worm gear is greater than or equal to the tooth top circle of the first spur gear.

[0084] In one embodiment, please refer to Figure 3 , Figure 4 A spacer 70 is provided between the worm wheel and the first spur gear. One end of the spacer 70 is fixedly connected to the worm wheel, and the other end of the spacer 70 is fixedly connected to the first spur gear.

[0085] Reference Figure 2 When the diameter of the worm wheel is larger than the diameter of the first spur gear, part of the end face of the worm wheel is not blocked by the first spur gear. Figure 3 , Figure 4, when the second spur gear is meshed with the first spur gear, the spacer 70 blocks between the end face of the worm wheel and the end face of the second spur gear. The setting of the spacer 70, on the one hand, can limit the safe distance between the end face of the worm wheel and the end face of the second spur gear. The axial position of the second spur gear is limited by the spacer 70, so as to avoid the situation that the end face of the second spur gear and the end face of the worm wheel are against each other due to assembly errors, displacement caused by later use, etc., thereby avoiding the problem of the worm wheel and the second spur gear interfering with each other and causing jamming. On the other hand, the spacer 70 is a solid structure, and the spacer 70 can realize the uniform transmission of force between the worm wheel and the first spur gear; in the worm wheel and the first spur gear, even if one of the wheel bodies has a short-term stress concentration, it will not directly affect the other wheel body, so as to ensure the overall structural strength of the entire component as much as possible.

[0086] In the case where the spacer 70 is provided, the worm gear, the spacer 70 and the first straight gear are optionally configured as an integrally formed structure, which has high processing efficiency and is conducive to improving the overall structural strength. In other embodiments, the spacer 70 and the worm gear, and the spacer 70 and the first straight gear can also be fixedly connected by welding or the like.

[0087] Optionally, refer to Figure 6 , Figure 4 In the case where the spacer 70 is provided, the diameter of the tooth top circle of the first spur gear is less than or equal to the diameter of the spacer 70. Thus, during processing, it is convenient to directly process the first spur gear and the spacer 70 on the boss by cutting, milling, etc., so as to realize the integral molding of the first spur gear and the spacer 70. In other embodiments, the diameter of the spacer 70 may also be less than the diameter of the tooth top circle of the first spur gear.

[0088] In other embodiments, the spacer 70 may not be provided between the worm wheel and the first spur gear, and the end surface of the worm wheel is connected to the end surface of the first spur gear.

[0089] In one embodiment, the speed ratio of the second transmission structure 30 to the first transmission structure 20 is a first speed ratio i1, and the speed ratio of the fourth transmission structure 50 to the third transmission structure 40 is a second speed ratio i2. The speed ratio of the reduction assembly is a total speed ratio i3, wherein the total speed ratio refers to the speed ratio of the fourth transmission structure 50 to the first transmission structure 20.

[0090] It should be noted that in this application, when describing the speed ratio of two components, it refers to the ratio of the speed of the driven component to the speed of the active component. This ratio can be a fraction, a decimal or an integer, which describes the speed of the driven component relative to the speed of the active component. When the speed ratio of the reduction component is large, the output torque of the output end of the reduction component is large.

[0091] Optionally, the total speed ratio is the product of the first speed ratio and the second speed ratio, and the total speed ratio is between 145 and 165. That is, i 3 = i 1*i 2, 145≤i 3≤165. In the present application, the total speed ratio of the reduction assembly of the power device is configured between 145 and 165, and the speed ratio is appropriate, which can not only provide a greater output torque to increase the weight of clothes that the electric clothes drying device can carry to make it greater than 50KG, but also control the speed ratio so that the output speed is not too slow, so that the lifting speed of the clothes drying rod 83 is not too slow, taking into account multiple requirements such as high load-bearing capacity, small size, and good user experience.

[0092] Optionally, the ratio of the first speed ratio to the second speed ratio is between 4.2 and 8.2. That is, 5.5≤i 1 / i2≤7.4. The first speed ratio is greater than the second speed ratio, so that the transmission ratio of the worm and the worm wheel is relatively large, and the transmission characteristics of the worm and the worm wheel are efficiently utilized to improve the total speed ratio of the reduction assembly. The worm and the worm wheel play a major role in improving the output torque, and the transmission ratio of the two spur gears can be slightly smaller, which can further adjust the output torque, avoiding the noise and vibration problems caused by the excessive transmission ratio between the two spur gears, thereby taking into account the total speed ratio of the reduction assembly and the quietness and stability requirements of the power device during operation.

[0093] Optionally, a ratio of the first speed ratio to the second speed ratio is between 5.5 and 6.9.

[0094] In one embodiment, the total speed ratio i3 of the reduction assembly is 155, the first speed ratio i1 is 31, the second speed ratio i2 is 5, and the ratio of the first speed ratio to the second speed ratio is 6.2.

[0095] In other embodiments, the total speed ratio of the reduction assembly is 150, the first speed ratio i1 is 35, the second speed ratio i2 is about 4.29, and the ratio of the first speed ratio to the second speed ratio is 8.16.

[0096] In one embodiment, the number of starts of the worm is Z1, the number of teeth of the worm wheel is Z2, the number of teeth of the first spur gear is Z3, and the number of teeth of the second spur gear is Z4.

[0097] Among them, the worm and the worm wheel are the first-stage meshing transmission, the worm drives the worm wheel to rotate, and the transmission ratio i1 of the worm and the worm wheel is Z2 / Z1. The first spur gear and the second spur gear are the second-stage meshing transmission, the first spur gear drives the second spur gear to rotate, and the transmission ratio i2 of the first spur gear and the second spur gear is Z4 / Z3.

[0098] In one embodiment, Z1 is 1, Z2 is between 29 and 33, Z3 is between 9 and 13, and Z4 is between 53 and 57. In other words, Z1=1, 29≤Z2≤33, 9≤Z3≤13, 53≤Z4≤57. Thus, 29≤i1≤33, 4.1≤i2≤6.3, 118.9≤i3≤207.9.

[0099] In yet another embodiment, Z1=1, 30≤Z2≤32, 10≤Z3≤12, 54≤Z4≤56. Thus, 30≤i1≤32, 4.5≤i2≤5.6, 135≤i3≤179.2.

[0100] In another embodiment, Z1=1, Z2=31, Z3=11, Z4=55, i1=31, i2=5, i3=155.

[0101] In another embodiment, Z1=1, Z2=32, Z3=10, Z4=49, i1=32, i2=4.9, i3=156.8.

[0102] Among them, Z1 is 1, that is, there is only one spiral line on the worm, and the worm is a single-start worm, which means that when the worm rotates one circle, the worm wheel matched with it will rotate one tooth. This configuration allows a larger transmission ratio to be achieved between the worm and the worm wheel.

[0103] In one embodiment, the total transmission efficiency of the power device is η3, the transmission efficiency of the motor 10 is η1, the transmission efficiency of the reduction assembly is η2, and the total transmission efficiency of the power device is η3, and the total transmission efficiency of the power device is the product of the transmission efficiency of the motor 10 and the transmission efficiency of the reduction assembly, that is, η3=η1×η2. The power of the motor 10 is transmitted to the reduction assembly through the motor shaft 11, and then transmitted to the output wheel 60 through the reduction assembly. In this embodiment, η3 is between 0.441 and 0.592.

[0104] Optionally, η1 is between 0.7 and 0.8, and η2 is between 0.63 and 0.74, so that η3 is between 0.441 and 0.592. In the electric clothes drying device, the power of the power device is transmitted to the clothes drying rod 83 through the output wheel 60. The power device will have energy loss in both the process of the motor 10 outputting power and the deceleration component performing deceleration transmission. By adopting the DC motor 10, η1 can be improved because it has a faster lifting speed, is smoother and is not prone to overheating.

[0105] In one embodiment, in the reduction assembly, the meshing transmission between the worm and the worm wheel is used as the first stage transmission, and the meshing transmission between the third spur gear and the fourth spur gear is used as the second stage transmission. While taking into account the output torque of the entire reduction assembly, the spur gear transmission with higher efficiency is placed at the rear end of the transmission chain, which is conducive to improving the transmission efficiency of the entire reduction assembly. Among them, the transmission efficiency η2 of the reduction assembly is the product of the worm gear transmission efficiency and the two spur gear transmission efficiencies. The efficiency of the helical worm gear transmission is configured to be 0.7 to 0.75, and the transmission efficiency of the two spur gears is configured to be 0.9 to 0.99, so that the transmission efficiency η2 of the reduction assembly is controlled between 0.63 and 0.74.

[0106] In this embodiment, the first-stage transmission adopts worm gear meshing, which can output greater torque, and the second-stage transmission adopts two spur gear meshing, which can further improve the output torque and improve the transmission efficiency of the reduction assembly. The transmission efficiency of the two spur gears is 0.9 to 0.99, which can more efficiently transmit power to the output wheel 60. In this embodiment, on the basis of meeting the large torque output, the carrying capacity of the power device can be improved, the efficiency and reliability of the entire power device can be improved, and the structure can be made more compact and lightweight.

[0107] When the power output of the power device is fixed, the higher the transmission efficiency of the reduction assembly, the higher the overall transmission efficiency of the power device, and the lower the power requirement for the input of the motor 10, thereby reducing the difficulty of selecting the motor 10 and facilitating controlling the cost and volume of the motor 10, thereby controlling the cost and volume of the electric clothes drying equipment.

[0108] Please continue to refer to Figure 5 In one embodiment, the diameter of the worm is d1, the diameter of the tooth top circle of the worm wheel is d2, the diameter of the tooth top circle of the first spur gear is d3, and the diameter of the tooth top circle of the second spur gear is d4.

[0109] Optionally, the ratio of d2 to d1 is between 2.6 and 3.0.

[0110] Optionally, the ratio of d3 to d2 is between 0.5 and 0.9.

[0111] Optionally, the ratio of d4 to d3 is between 3.8 and 4.2.

[0112] Among them, the ratio of d2 to d1 is controlled between 2.6 and 3.0, and the ratio of the tooth top circle diameters of the worm and the worm wheel is appropriate, which is conducive to torque transmission and amplification, and allows the worm and worm wheel to transmit reliably and stably.

[0113] The ratio of d3 to d2 is controlled between 0.5 and 0.9, and the first spur gear and the worm wheel are fixedly connected to form a component. On the one hand, it can meet the configuration requirements of a large number of worm wheel teeth and a small number of first spur gear teeth, so as to meet the requirements of worm and worm wheel reduction transmission, and first spur gear and second spur gear reduction transmission; on the other hand, it can avoid that the diameter of the top circle of the worm wheel tooth is too different from the diameter of the top circle of the first spur gear tooth, so as to avoid that the volume of the worm wheel is too large and the volume of the first spur gear is too small. When the worm wheel transmits a large torque to the first spur gear, the first spur gear can reliably receive the force and evenly transmit the force to the second spur gear, so as to avoid the stress concentration of the first spur gear and the fracture, and the speed reduction assembly can operate reliably. In addition, the ratio of d3 to d2 is controlled between 0.5 and 0.9, and the diameter ratio of the worm wheel and the first spur gear is reasonable, so as to avoid space waste.

[0114] The ratio of d4 to d3 is controlled between 3.8 and 4.2, and the diameter ratio of the first spur gear and the second spur gear is appropriate, which is conducive to torque transmission and amplification, and allows the first spur gear and the second spur gear to transmit reliably and stably.

[0115] In one embodiment, d1 = 9.0 mm, d2 = 25.2 mm, d3 = 17.4 mm, and d4 = 70.25 mm. The ratio of d2 to d1 is 2.8, the ratio of d3 to d2 is 0.7, and the ratio of d4 to d3 is 4.0. By controlling the diameters of the four transmission structures, the entire reduction assembly can be made more compact and reasonable while taking into account the two-stage transmission ratio distribution, and the transmission is reliable and stable.

[0116] In one embodiment, in the reduction assembly of the power device, the first transmission structure 20 is a worm, the second transmission structure 30 is a worm wheel, the third transmission structure 40 is a first spur gear, and the fourth transmission structure 50 is a second spur gear. This embodiment provides a high-load-bearing clothes drying device, the power device can drive the lifting of at least 60KG of clothes, the motor 10 is composed of a motor 10 body and a reduction assembly, the speed ratio of the reduction assembly is i 3, i 3 is 155. The efficiency of the reduction assembly is η1, η1 is 0.63 to 0.74; the efficiency of the motor 10 is η2, η2 is 0.7 to 0.8. Therefore, the efficiency of the power device is η3, η3 is 0.441 to 0.592.

[0117] According to the output torque of the power device being equal to the product of the input torque T of the motor 10, the total speed ratio i 3, and the total efficiency η3 of the power device, in order for the power device to carry a target object of weight m and achieve its lifting, the output torque of the power device is at least equal to the gravity of the target object acting on the two output wheels 60, and the output torque of the power device is at least equal to mg, where g is the acceleration of gravity. The torque required by the motor 10 is: T = mg (r / η3) / i 3 = mgr / i 3 * η3.

[0118] In this embodiment, when hanging 60 kg of clothing, the torque required by the motor 10 is: T = 6.43r to 8.62r, and the unit of T is mNm. The m in mg is the mass of clothing, g is 9.8, η3 is the efficiency of the power device, and r is the radius of the output wheel 60. When the diameter of the output wheel 60 is 52 mm to 56 mm, according to the calculation formula of the torque required by the motor 10, the torque required by the motor 10 is 167 mNm to 241 mNm. When selecting the motor 10, ensure that the rated working torque of the motor 10 is in or greater than this range to meet the high load-bearing requirements.

[0119] In this embodiment, when hanging 65 kg of clothes, the torque required by the motor 10 is: T = 6.93r to 9.30r, where T is in mNm. η3 is the efficiency of the power unit, and r is the radius of the output wheel 60. When the diameter of the output wheel 60 is 52 mm to 56 mm, according to the calculation formula of the torque required by the motor 10, the torque required by the motor 10 is 180 mNm to 260 mNm. When selecting the motor 10, ensure that the rated working torque of the motor 10 is in or greater than this range to meet the high load-bearing requirements.

[0120] It should be noted that torque, moment of force and torque refer to the same concept.

[0121] In one embodiment, the torque required by the motor 10 is: T = mg (r / η3) / i 3 = mgr / i 3 * η3. The weight m of the clothes that can be hung by the power device and the clothes drying device is between 55 and 65 kg, and the torque T required by the motor 10 is between 155 mNm and 250 mNm. The load capacity of this embodiment is reasonable, meeting the use needs of more users, and the rated working torque of the motor 10 is reasonable, and the corresponding motor 10 has a suitable volume and a suitable cost.

[0122] The following table provides several parameter configuration methods of clothes drying equipment. In different parameter configuration methods, one or more parameters including the torque T required by the motor 10 (i.e., the rated working torque range of the motor 10), the weight of clothes that can be hung m, the diameter r of the output wheel 60, the total speed ratio i 3 of the reduction assembly, and the total efficiency η3 of the power device are different.

[0123]

[0124] In the description of this article, it should be understood that the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0125] In the description of this specification, the description with reference to the terms "an embodiment", "example", 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.

[0126] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0127] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A power device, characterized in that: The power device is used for electric household equipment, and the power device comprises: A motor (10) having a motor shaft (11); A reduction assembly, comprising a first transmission structure (20) fixedly connected to the motor shaft (11), a second transmission structure (30) transmission-connected to the first transmission structure (20), a third transmission structure (40) fixedly connected to the second transmission structure (30), and a fourth transmission structure (50) transmission-connected to the third transmission structure (40); An output wheel (60) fixedly connected to the fourth transmission structure (50); Wherein, the output wheels (60) are arranged on both sides of the motor shaft (11), the number of the fourth transmission structures (50) in the reduction assembly is consistent with the number of the output wheels (60), the number of the third transmission structures (40) is consistent with the number of the fourth transmission structures (50), and the number of the second transmission structures (30) is consistent with the number of the third transmission structures (40).

2. The power device according to claim 1, characterized in that: A transmission ratio between the first transmission structure (20) and the second transmission structure (30) is greater than 1, and a transmission ratio between the third transmission structure (40) and the fourth transmission structure (50) is greater than 1; The first transmission structure (20) is a worm, the second transmission structure (30) is a worm wheel, the third transmission structure (40) is a first spur gear, and the fourth transmission structure (50) is a second spur gear; the worm wheel meshes with the worm, and the second spur gear meshes with the first spur gear.

3. The power device according to claim 2, characterized in that: The motor (10) is a brushed DC motor; The worm is an Archimedean worm or an involute cylindrical worm; The rotation axis of the motor shaft (11) and the first transmission structure (20) is a first axis (91), the rotation axis of the second transmission structure (30) and the third transmission structure (40) is a second axis (92), and the rotation axis of the fourth transmission structure (50) and the output wheel (60) is a third axis (93); the first axis (91) and the second axis (92) are skewed and staggered, and the third axis (93) is parallel to the second axis (92); The motor shaft (11) and the worm are an integrally formed structure, the second transmission structure (30) and the third transmission structure (40) are an integrally formed structure, and the fourth transmission structure (50) and the output wheel (60) are an integrally formed structure.

4. The power device according to claim 2, characterized in that: A spacer (70) is provided between the worm gear and the first spur gear; The worm gear, the spacer (70), and the first spur gear are an integrally formed structure; The diameter of the tooth tip circle of the first spur gear is smaller than or equal to the diameter of the spacer (70).

5. The power device according to claim 2, characterized in that: The speed ratio of the second transmission structure (30) to the first transmission structure (20) is a first speed ratio, the speed ratio of the fourth transmission structure (50) to the third transmission structure (40) is a second speed ratio; the speed ratio of the reduction assembly is a total speed ratio; The total speed ratio is the product of the first speed ratio and the second speed ratio, and the total speed ratio is between 145 and 165; A ratio of the first speed ratio to the second speed ratio is between 4.2 and 8.

2.

6. The power device according to claim 2, characterized in that: The number of starts of the worm is Z1, the number of teeth of the worm wheel is Z2, the number of teeth of the first spur gear is Z3, and the number of teeth of the second spur gear is Z4; Z1 is 1, Z2 is between 29 and 33, Z3 is between 9 and 13, and Z4 is between 53 and 57.

7. The power device according to claim 1 or 2, characterized in that: The transmission efficiency of the motor (10) is η1, the transmission efficiency of the reduction component is η2, the transmission efficiency of the power device is η3, and the transmission efficiency of the power device is the product of the transmission efficiency of the motor (10) and the transmission efficiency of the component; η1 is between 0.63 and 0.74; η2 is between 0.63 and 0.74; η3 is between 0.441 and 0.

592.

8. The power device according to claim 2, characterized in that: The diameter of the worm is d1, the addendum diameter of the worm wheel is d2, the addendum diameter of the first spur gear is d3, and the addendum diameter of the second spur gear is d4; The ratio of d2 to d1 is between 2.6 and 3.0; The ratio of d3 to d2 is between 0.5 and 0.9; The ratio of d4 to d3 is between 3.8 and 4.

2.

9. A clothes drying device, characterized in that: It comprises the power device as claimed in claim 8, and further comprises a drying rod (83) and a connecting line (82); Connecting wires (82) are respectively arranged at both ends of the drying rod (83), and the connecting wires (82) connected to the two ends of the drying rod (83) are respectively wound around the two output wheels (60); the power device is used to drive the drying rod (83) to rise and fall through the output wheels (60).

10. The clothes drying device according to claim 9, characterized in that: The weight carried by the power device is m, the input torque of the motor (10) is T, the reduction ratio of the reduction assembly is i 3, the total efficiency of the power device is η3, and the radius of the output wheel (60) is r; T = mg (r / η3) / i 3; When m is 60KG, i 3 is 155, η3 is between 0.441 and 0.592, and r is between 26mm and 28mm, the input torque T is between 167mNm and 241mNm; When m is 65KG, i 3 is 155, η3 is between 0.441 and 0.592, and r is between 26mm and 28mm, the input torque T is between 180mNm and 261mNm.

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