An air duct structure and a clothes dryer

Abstract

The present invention provides an air duct structure, which includes a volute. A fan and an air outlet for discharging air flow are arranged inside the volute. A wind guiding channel extending towards the outside of the volute is arranged at the air outlet. The wind guiding channel is an air flow channel that gradually narrows from both ends to the middle. Through the arrangement of the wind guiding channel, the air flow discharged from the volute can be evenly dispersed, and thus the air flow discharged by the air duct structure is more uniform. The present invention also provides a dryer, in which the above-mentioned air duct structure is arranged inside. A drum is also arranged inside the dryer, and a motor for driving the drum and the fan in the air duct structure to rotate forward and backward is provided. The dryer provided by the present invention can use one motor to drive the drum and the fan to rotate forward and backward simultaneously, saving costs and space. The arrangement of the air duct structure in the dryer can enable the air duct structure to discharge uniform and dispersed air flow under both forward and reverse rotations, achieving a good drying effect on objects.

Description

Technical Field

[0001] The present invention relates to the field of drying household appliances, and in particular, to an air duct structure and a dryer. Background Art

[0002] In the current air duct structure, a relatively common structure is to set a volute with an embedded fan, and use the contour of the volute to guide the air flow blown out by the fan. Finally, the air flow blown out by the fan is sent out from the air outlet of the volute. However, the shape and structure of the current volute generally cause the finally sent air flow to deviate to one side, that is, the air flow is more concentrated on the same side and the air flow distribution is uneven. And currently, in the drying air duct structure, the volute-shaped structure is also often used to guide the air, which causes the sent air flow to deviate to one side, may lead to uneven drying of the object, and even in extreme cases, may cause local burning of the dried object.

[0003] There is a Chinese invention patent that provides a dryer. A fan is arranged inside it. The fan includes a volute and a fan. The inner cavity of the volute is a symmetric structure. The fan is located in the inner cavity of the volute and the center of the fan is arranged on the symmetry axis of the inner cavity of the volute. A flow guiding device is arranged on the side of the fan facing the air outlet of the volute and there is a gap between the flow guiding device and the outer periphery of the fan. And the flow guiding device is a symmetric structure and its center is arranged on the symmetry axis of the inner cavity of the volute. Through the flow guiding device, the main air flow generated by the fan flows along one side of the flow guiding device and the opposite side wall of the volute to the heating device. The main air flow covers most or all of the area of the heating device. Less air flow turns back towards the fan direction after hitting the other side wall of the volute and rejoins the rotation of the fan under the guidance of the other side wall of the volute and the flow guiding device, and no concentrated backflow will be generated between the fan and the volute outlet. The utilization efficiency of the heating device is improved. However, in this patent, it is obvious that the air flow at the air outlet of the volute deviates to one side, resulting in uneven air outlet.

[0004] In summary, there is a need for an air duct structure that can evenly output warm air while using the volute to guide the air.

[0005] In view of the above problems, the present invention is specifically proposed. Summary of the Invention

[0006] The object of the present invention is to provide an air duct structure that can achieve the effect of evenly transporting air flow.

[0007] The present invention provides an air duct structure, which includes a volute. A fan and an air outlet for discharging air flow are arranged inside the volute. A wind guiding channel extending towards the outside of the volute is arranged at the air outlet. The wind guiding channel is an air flow channel that gradually narrows from both ends to the middle. Through the arrangement of the wind guiding channel, the air flow discharged from the volute can be evenly dispersed, and thus the air flow discharged by the air duct structure is more uniform. When using the air duct structure to dry an object, the object to be dried is evenly dried, resulting in a better drying effect.

[0008] Further, the wind guiding channel extends along the axis of the air outlet. An air inlet and an air outlet are respectively arranged at both ends of the extending direction. The air inlet is connected to the air outlet. The wind guiding channel gradually narrows from the air inlet to the middle to form a first flared structure, and the wind guiding channel gradually narrows from the air outlet to the middle to form a second flared structure. The first flared structure and the second flared structure are connected in the middle of the wind guiding channel. And the structural shape of the wind guiding channel is reasonably set. The first flared structure is convenient for guiding the air flow discharged from the volute into the wind guiding channel, and the second flared structure is convenient for evenly and dispersedly discharging the air flow in the wind guiding channel, so as to evenly dry the object to be dried.

[0009] Further, the first flared structure includes a first tapered section near the air inlet. The side wall slope of the first tapered section forming a cone is a fixed value. The first tapered section is connected to a second tapered section extending towards the middle of the wind guiding channel. The side wall slope of the second tapered section forming a cone is a fixed value, and the slope is relatively smaller than that of the first tapered section. The second flared structure includes a third tapered section near the air outlet. The side wall slope of the third tapered section forming a cone is a fixed value. The third tapered section is connected to a fourth tapered section extending towards the middle of the wind guiding channel. The side wall slope of the fourth tapered section forming a cone is a fixed value, and the slope is relatively smaller than that of the third tapered section. The second tapered section and the fourth tapered section are connected. Preferably, an arc filter is arranged at the connection position of each tapered section with different slopes in the wind guiding channel. The structural settings of each tapered section in the wind guiding channel are reasonable and convenient for guiding the air flow.

[0010] Further, the wind guiding channel is formed by enclosing two wind guiding side plates. The two wind guiding side plates are respectively located on the circumferential two sides close to the air outlet of the volute. The two wind guiding side plates are symmetrically arranged along the axis of the wind guiding channel. Preferably, the top surface in the vertical direction of the wind guiding side plate and the top wall in the vertical direction at the air outlet of the volute are in the same plane, and the bottom surface in the vertical direction of the wind guiding side plate and the bottom wall in the vertical direction at the air outlet of the volute are in the same plane. The wind guiding channel can be formed only by enclosing two wind guiding side plates, saving materials and simplifying the structure.

[0011] Furthermore, a partial structure at the air inlet of the air guiding channel is embedded in the air outlet of the volute; preferably, the top surface in the vertical direction of the air guiding side plate abuts against the top wall in the vertical direction at the air outlet of the volute, and the bottom surface in the vertical direction of the air guiding side plate abuts against the bottom wall in the vertical direction at the air outlet of the volute. The air guiding side plate can jointly form the air guiding channel with the top wall and the bottom wall in the vertical direction of the volute, so that the structure of the air guiding channel is simple and it is more conducive to collecting air flow.

[0012] As an embodiment, the present invention also proposes to provide a heating device in the air duct structure, and the air outlet of the air guiding channel extends at least to a position close to the heating device; preferably, a partial structure of the heating device is embedded in the air outlet of the air guiding channel. Through the cooperative setting of the air guiding channel and the heating device, it is possible to evenly discharge the air flow onto the heating device by using the air guiding channel, so that the heating device is evenly heated everywhere, and then a uniformly arranged high-temperature drying air flow is formed.

[0013] Furthermore, the air outlet of the air guiding channel is arranged facing the heating device, and at least the middle part of the heating device is opposite to the air outlet of the air guiding channel; the horizontal side walls perpendicular to the axial direction at the air outlet of the air guiding channel respectively extend to both sides of the middle part of the heating device; preferably, the central axis of the air guiding channel is arranged opposite to the central axis of the heating device. The structural settings of the air guiding channel and the heating device make the air flow discharged from the air guiding channel easier to be evenly arranged on the heating device, so that the heating device is evenly heated and a uniform high-temperature drying air flow is formed.

[0014] Furthermore, a straight vane fan that can rotate forward and backward is arranged in the volute, and the inside of the volute has a structure without a volute tongue. Through the setting of the straight vane fan and the volute structure without a volute tongue, the air duct structure can discharge an equal amount of air flow when the fan rotates forward and backward.

[0015] Furthermore, the air duct structure includes a volute and a straight vane fan embedded in the volute, and an air guiding channel extending from the air outlet to the heating device is arranged at the air outlet of the volute; the volute, the straight vane fan, the air guiding channel, and the heating device are all axisymmetric structures, and the symmetry axes of the volute, the straight vane fan, the air guiding channel, and the heating device are all arranged along the same straight line. The positions of the volute, the straight vane fan, the air guiding channel, and the heating device in the air duct system are reasonably arranged, so that the air flow discharged from the volute in the air duct system is more easily guided by the air guiding channel, evenly flows to the heating device, is evenly heated on the heating device, and finally outputs a high-temperature and uniform air flow.

[0016] As an embodiment, the present invention further provides a dryer, which is internally provided with the air duct structure as described above. A drum is also arranged inside the dryer, and a motor is provided to drive the drum and the fan in the air duct structure to rotate forward and backward. The dryer provided by the present invention can use one motor to drive the drum and the fan to rotate simultaneously, saving costs and space, and the motor can drive the drum and the fan to rotate forward and backward. The arrangement of the air duct structure in the dryer can enable the air duct structure to discharge uniform and divergent airflows under both forward and reverse rotations, achieving a good drying effect on objects.

[0017] Adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0018] 1) For the air duct structure provided by the present invention, a wind guiding channel for guiding the airflows to diverge uniformly is arranged near the air outlet of the volute. Through the arrangement of the wind guiding channel, the airflows discharged from the volute are uniform and there are airflows in all directions, that is, the airflows discharged from the air duct structure are more uniform and diverge in all directions. When using the air duct structure to dry an object, the object to be dried is dried evenly and local overheating is prevented, ensuring the drying effect.

[0019] 2) The wind guiding channel structure provided by the present invention is reasonable. It extends from the air outlet of the volute to the outside of the volute, so that the wind guiding channel guides the airflows discharged from the volute to the outside of the volute. Moreover, the cross-sectional areas at the air inlet and air outlet of the wind guiding channel are relatively large and the middle part is narrowed, which is conducive to guiding the airflows discharged from the volute into the wind guiding channel and conducive to the uniform and divergent discharge of the airflows in the wind guiding channel.

[0020] 3) The wind guiding channel of the present invention includes a first flared structure and a second flared structure arranged at the air inlet. The first flared structure is convenient for guiding the airflows discharged from the volute into the wind guiding channel, and the second flared structure is convenient for the uniform and divergent discharge of the airflows in the wind guiding channel, so as to evenly dry the object to be dried. The slopes of the side walls forming the cones in each conical section of the wind guiding channel are all set to a fixed value, so that the side walls of each conical section are all inclined planes, which is more conducive to guiding the airflows. And the slope changes of the first conical section and the second conical section are more conducive to guiding the airflows into the wind guiding channel; the slope changes of the third conical section and the fourth conical section are more conducive to the uniform and divergent flow of the airflows in the wind guiding channel to the discharge.

[0021] 4) The wind guiding channel of the present invention can be provided with only two wind guiding side plates, with a simple structure and can achieve the effect of making the air discharged from the volute uniform and divergent. The present invention also proposes a scheme of using the wind guiding side plates, the top wall and the bottom wall in the vertical direction of the volute to jointly enclose the wind guiding channel, making full use of the existing structure of the volute, achieving the effects of saving costs and space, and making the wind guiding channel more conducive to air collection and guiding the airflows.

[0022] 5) The air duct structure provided by the present invention is also provided with a heating device, and the air guide channel and the heating device are arranged in cooperation, so that the air flow flowing to each part of the heating device is evenly distributed, thereby making the heating device evenly heated. In addition, the positions of the air guide channel and the heating device are arranged so that the air guide channel can extend to both sides of the heating device, which is more conducive to making the air flow evenly flow on the heating device, thereby forming a uniform high-temperature air flow.

[0023] 6) The present invention also provides a clothes dryer, in which a fan and a drum can be rotated forward and reversely by a motor. The arrangement of the volute, fan, air guide channel and heating device in the air duct structure enables the air duct structure to generate an equal amount of uniform drying airflow regardless of the forward or reverse rotation of the motor, so that a better drying effect can be obtained in both the forward and reverse rotation conditions.

[0024] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0026] Figure 1 It is a partial cross-sectional schematic diagram of the air duct structure of the present invention;

[0027] Figure 2 It is a partial enlarged schematic diagram of the air guide channel of the present invention;

[0028] Figure 3 It is a schematic diagram of the air guide channel part in the air duct structure of the present invention being embedded in the air outlet;

[0029] Figure 4 It is a schematic diagram showing that the air guide channel portion in the air duct structure of the present invention is embedded in the housing of the heating device.

[0030] Explanation of the numbers in the accompanying drawings: 1. volute; 2. fan; 3. exhaust port; 4. air guide channel; 5. air inlet; 6. air outlet; 7. first bell-mouth type structure; 8. second bell-mouth type structure; 9. first cone section; 10. second cone section; 11. third cone section; 12. fourth cone section; 13. air guide side plate; 14. top end surface; 15. top wall; 16. bottom end surface; 17. bottom wall; 18. heating device; 19. straight-blade fan; 20. heating device casing.

[0031] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the concept of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Description of the Embodiments

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will describe the embodiments in detail with reference to the accompanying drawings in the embodiments of the present invention.

[0033] Embodiment 1

[0034] In household appliances with a drying function, an air duct structure is usually provided to dry an object by using the airflow generated by the air duct structure. A fan 2 that generates airflow is usually provided in the air duct structure, and the fan 2 is embedded in a hollow volute 1. The hollow housing of the volute 1 forms an air duct for the airflow generated by the fan 2 to flow, and an air outlet 3 for discharging the airflow is provided at the end of the air duct. Once the fan 2 operates, airflow will continuously be discharged from the air outlet 3, and by guiding the airflow generated at the air outlet 3 to the object to be dried, drying the object by using the airflow can be achieved. However, affected by the structure of the volute 1, the airflow generated at the air outlet 3 may be uneven. For example, for a traditional "P"-shaped volute, the airflow may tend to be discharged from one side wall of the volute, which will result in uneven drying airflow on the object to be dried. For some air duct structures with an internal heating device 18, it may cause the local part of the object to be dried to be continuously baked by the high-temperature drying airflow, and in extreme cases, it may even cause local ignition of the object. In view of the above technical problems, this embodiment provides an air duct structure that can make the airflow discharged from the volute 1 be transported more evenly. Specifically, as Figures 1-4 shown in the figure, a wind guiding channel 4 is provided at the air outlet 3 of the volute 1 of the air duct structure provided in this embodiment, and the drying airflow discharged from the air outlet 3 is evenly diffused and discharged by using the wind guiding channel 4.

[0035] As Figures 1-4As shown in the figure, the air guiding channel 4 extends from near the air outlet 3 to the outside of the volute 1 to guide the drying air flow discharged from the air outlet 3 of the volute 1 to the outside of the volute 1, that is, to divert the drying air flow generated by the volute 1. To facilitate the flow of the air flow, the air guiding channel 4 extends along the axial direction of the air outlet 3. Such a setting makes the air guiding channel 4 extend in a straight line, which is more conducive to the flow of gas compared to a channel extending along a bent curve. And the air guiding channel 4 is arranged along the axial direction of the air outlet 3, making the air flow discharged from the air outlet 3 more likely to flow into the air guiding channel 4. An air inlet 5 is arranged at the end of the air guiding channel 4 close to the air outlet 3, and an air outlet 6 is arranged at the end opposite to the air inlet 5; so that the air flow discharged from the air outlet 3 flows in the air guiding channel 4 along the direction from the air inlet 5 to the air outlet 6. The air guiding channel 4 has a structure with a relatively large cross-sectional area at the air inlet 5 and the air outlet 6, and the middle cross-section between the air inlet and the air outlet is narrowed. The cross-sectional area of the air inlet 5 of the air guiding channel 4 is set relatively large, so that more air flow discharged from the air outlet 3 can enter the air guiding channel 4, that is, the air guiding channel 4 can collect more air flow discharged from the volute 1. And the middle cross-section of the air guiding channel 4 is first narrowed and then the cross-sectional area at the air outlet 6 is enlarged again, so that the air flow discharged from the air outlet 6 of the air guiding channel 4 can be guided to diverge in all directions, which is conducive to the uniform flow of the drying air flow. As Figure 3 shown by the arrow in the figure, the air flow in the air guiding channel 4 can diverge in all directions at the air outlet 6.

[0036] And to better guide the air flow, a horn-shaped structure that gradually narrows towards the middle can be arranged at the air inlet 5 and the air outlet 6. The horn-shaped structure with an inclined boundary is more conducive to guiding the air flow. Specifically, as Figures 1-4 shown in the figure, the air guiding channel 4 gradually narrows from the air inlet 5 to the middle to form a first horn-shaped structure 7, and the air guiding channel 4 gradually narrows from the air outlet 6 to the middle to form a second horn-shaped structure 8. And the first horn-shaped structure 7 is connected to the second horn-shaped structure 8 in the middle of the air guiding channel 4. The connected position in the middle of the first horn-shaped structure 7 and the second horn-shaped structure 8 constitutes the middle region of the air guiding channel 4, so that the middle part is narrowed relative to the air inlet 5 and the air outlet 6 of the air guiding channel 4. Such a setting makes it easy to collect more air flow discharged from the air outlet 3 at the position of the air inlet 5, and makes the air flow discharged from the air guiding channel 4 more divergent and uniform at the air outlet 6.

[0037] Specifically, as Figures 1-4As shown in the figure, the first flared structure 7 includes a first tapered section 9 near the air inlet 5, and the side wall slope of the first tapered section 9 that forms a cone is a fixed value. Setting the side wall of the first tapered section 9 to a structure with a fixed slope makes the side wall enclosing the first tapered section 9 a linearly inclined structure. Compared with the curved side wall with variable curvature, it makes the airflow more smooth and more conducive to guiding the airflow. If the side wall enclosing the first tapered section 9 is set to a curved side wall with variable slope, it may cause vortices in some positions, which is not conducive to the flow of gas. The first tapered section 9 is connected to a second tapered section 10 extending towards the middle of the air guiding channel 4, and the side wall slope of the second tapered section 10 that forms a cone is a fixed value. Similarly as described above in the second tapered section 10, in order to make the airflow flow more smoothly in the second tapered section 10, the side wall slope of the cone forming the second tapered section 10 is also set to a fixed value. Since the second tapered section 10 is closer to the middle of the air guiding channel 4 compared with the first tapered section 9, and the first tapered section 9 is closer to the air inlet 5 of the air guiding channel 4, the second tapered section 10 should be more narrowed relative to the first tapered section 9. Therefore, the slope of the second tapered section 10 is smaller than the slope of the first tapered section 9, making it easy for the airflow to flow in from the air inlet 5 of the air guiding channel 4 and flow along the air guiding channel 4.

[0038] Similarly, the second flared structure 8 provided at the air outlet 6 of the air guiding channel 4 is also divided into a third tapered section 11 and a fourth tapered section 12, and in order to facilitate the smooth flow of the airflow, the side walls of the third tapered section 11 and the fourth tapered section 12 are both side walls with a fixed slope. Specifically as Figures 1-4 shown in the figure, the second flared structure 8 includes a third tapered section 11 near the air outlet 6, and the side wall slope of the third tapered section 11 that forms a cone is a fixed value; the third tapered section 11 is connected to a fourth tapered section 12 extending towards the middle of the air guiding channel 4, and the side wall slope of the fourth tapered section 12 that forms a cone is a fixed value, and the slope is smaller than that of the third tapered section 11. The slope of the fourth tapered section 12 is smaller than the slope of the third tapered section 11, and the air guiding channel 4 forms a structure that gradually expands from the middle to the air outlet 6 at the air outlet 6. When the airflow in the air guiding channel 4 is discharged from the air outlet 6, due to the larger cross-sectional area at the air outlet 6, the airflow can be more divergent and uniform. The second tapered section 10 and the fourth tapered section 12 are connected to each other in the middle of the air guiding channel 4 to form a complete air guiding channel 4. Preferably, as Figure 2As shown in the figure, arc filtering is provided at the connection positions of the conical sections with different slopes in the air guiding channel 4 to avoid the sharp corner structure caused by the direct connection between the conical sections with different slopes. The sharp corner structure may cause injury to the human hand. The structure of each conical section in the air guiding channel 4 provided in this embodiment is reasonably arranged, so that the air flow can flow smoothly in each conical section; and the splicing between the four different conical sections makes the air flow discharged from the air outlet 3 of the volute 1 easy to be collected into the air guiding channel 4, and the gas discharged from the air guiding channel 4 is more uniform and divergent, making the air flow discharged from the air guiding channel 4 more conducive to uniformly drying the object.

[0039] The air guiding channel 4 can be set as a split splicing structure surrounded by multiple side walls, or a housing structure formed integrally. When the air guiding channel 4 is a structure surrounded by multiple side walls, it can be surrounded into a structure with only an air inlet 5 and an air outlet 6, and the other parts are closed. Or in order to simplify the structure of the air guiding channel 4 and save materials, the air guiding channel 4 is surrounded by the air guiding side plates 13 on both sides in the horizontal direction. The two air guiding side plates 13 can be respectively set as a structure similar to a "C" shape, and the two air guiding side plates 13 are symmetric about the central axis of the air guiding channel 4, and jointly surround the shape of the air guiding channel 4 with a larger cross-sectional area at both ends and a narrowed middle part described above.

[0040] The air guiding side plate 13 can define the circumferential boundary of the air guiding channel 4, that is, as shown in the figure, it defines the left and right boundaries of the air guiding channel 4. However, it does not define the vertical boundary perpendicular to the circumferential direction of the air guiding channel 4, that is, the top and bottom ends of the air guiding channel 4 are not limited. That is, the air guiding channel 4 is not limited in the direction perpendicular to the figure, which may cause the gas entering the air guiding channel 4 discharged from the volute 1 to be discharged in the non-limited vertical direction, affecting the air flow collection ability of the air guiding channel 4. Therefore, preferably, the top end surface 14 and the bottom end surface 16 of the air guiding side plate 13 in the vertical direction are respectively abutted against the wall of the volute 1 to limit the boundary of the air guiding channel 4 in the vertical direction, preventing the air flow in the air guiding channel 4 from leaking out of the air guiding channel 4 in the vertical direction. Or the air duct structure has an integral outer shell, and the volute 1 and the air guiding channel 4 are both embedded in the outer shell of the air duct structure. The top end surface 14 and the bottom end surface 16 of the air guiding side plate 13 can be respectively abutted against the wall of the outer shell of the air duct structure. Similarly, the wall of the outer shell of the air duct structure can be used to limit the outside of the air guiding channel 4 in the vertical direction. That is, the air guiding side plate 13 can surround the air guiding channel 4 with a closed perimeter together with the wall of the volute 1 or the wall of the outer shell of the air duct structure, so that the air guiding channel 4 has a structure with only the air inlet 5 and the air outlet 6 open and other positions closed, which can better limit the air flow in the air guiding channel 4, and it can only flow in from the air inlet 5 and flow out from the air outlet 6, and flow along the guidance of the air guiding channel 4.

[0041] Since the air guiding channel 4 is used to guide the flow of the air discharged from the air outlet 3 of the volute 1, that is, only the air discharged from the air outlet 3 of the volute 1 is guided in the actual air guiding channel 4. Therefore, the circumferential horizontal boundary of the air guiding channel 4 only needs to coincide with the circumferential horizontal boundary of the air outlet 3 of the volute 1, and the vertical boundary of the air guiding channel 4 only needs to coincide with the vertical boundary of the air outlet 3 of the volute 1. That is, further preferably, the top surface 14 in the vertical direction of the air guiding side plate 13 and the top wall 15 in the vertical direction at the air outlet 3 are in the same plane, and the bottom surface 16 in the vertical direction of the air guiding side plate 13 and the bottom wall 17 in the vertical direction at the air outlet 3 are in the same plane. The vertical boundary of the air guiding channel 4 only needs to coincide with the vertical boundary of the air outlet 3.

[0042] As shown in the figure, in order to ensure that the air discharged from the air outlet 3 can flow into the air guiding channel 4, the position of the air guiding channel 4 close to the air outlet 3 can be set, and the closer the air inlet 5 of the air guiding channel 4 is to the air outlet 3, the better. As shown in this embodiment, a part of the structure at the air inlet 5 of the air guiding channel 4 is embedded in the air outlet 3 of the volute 1; it is ensured that a part of the air discharged from the air outlet 3 can flow into the air guiding channel 4. Since a part of the air guiding channel 4 is embedded in the air outlet 3, that is, the air guiding side plate 3 extends into the air outlet 3, the above-mentioned vertical boundary of the air guiding channel 4 can be defined by the wall of the volute 1. Preferably, the top surface 14 in the vertical direction of the air guiding side plate 13 abuts against the top wall 15 in the vertical direction at the air outlet 3 of the volute 1, and the bottom surface 16 in the vertical direction of the air guiding side plate 13 abuts against the bottom wall 17 in the vertical direction at the air outlet 3 of the volute 1. In this way, the top wall 15 and the bottom wall 17 in the vertical direction at the air outlet 3 of the volute 1 can be used to jointly define the vertical boundary of the air guiding channel 4. The air guiding side plate 13 only needs to abut against the top wall 15 and the bottom wall 17 of the volute 1 to form the air guiding channel 4 with the circumferential boundary limited all around, so that the air flow in the air guiding channel 4 is not easy to disperse to the outside, which is convenient for the air to flow well in the air guiding channel 4. And by using the top wall 15 and the bottom wall 17 at the air outlet 3 of the volute 1 to define the vertical boundary of the air guiding channel 4, only the air guiding side plates 13 on both sides need to be provided in the air guiding channel 4, which can relatively save materials and simplify the structure.

[0043] In the air duct structure provided by this embodiment, the air guiding channel 4 is reasonably arranged at the air outlet 3 of the volute 1. Through the arrangement of the air guiding channel 4, the air discharged from the volute 1 can be discharged evenly and divergently through the air guiding channel 4, so that the drying air flow can dry the object more evenly when flowing towards the object.

[0044] Embodiment 2

[0045] On the basis of the above embodiments, this embodiment provides an air duct structure. The air duct structure provided in this embodiment is the same as the air duct structure provided in Embodiment 1. That is, a wind guiding channel 4 is provided near the air outlet 3 of the volute 1, and the air flow discharged from the volute 1 is guided by the wind guiding channel 4. Compared with the air duct structure of Embodiment 1, a heating device 18 is arranged inside the air duct structure of this embodiment, and the heating device 18 can be used to heat the air flow, so that the drying air flow is heated up and a better drying effect is obtained. Since the wind guiding channel 4 has the effect of diverging and evenly distributing the air flow, the air outlet 5 of the wind guiding channel 4 can extend at least to a position close to the heating device 18, so that the air discharged from the wind guiding channel 4 can flow evenly to the heating device 18, and then a more evenly distributed heated drying air flow is obtained. Preferably, in order to ensure that the air flow discharged from the wind guiding channel 4 can contact and pass through the heating treatment of the heating device 18, as shown in the figure, a part of the structure of the heating device 18 is embedded in the air outlet 6 of the wind guiding channel 4. So that part of the air flow discharged from the wind guiding channel 4 will surely pass through the heating treatment of the heating device 18.

[0046] As Figure 1 , 3 , and as shown in 4, the air outlet 6 of the wind guiding channel 4 is arranged directly opposite to the heating device 18, and at least the middle part of the heating device 18 is opposite to the air outlet 6 of the wind guiding channel 4. The air outlet 6 of the wind guiding channel 4 is arranged directly opposite to the heating device 18, so that the air flow discharged from the wind guiding channel 4 can easily contact the heating device 18, and then obtain the heating treatment of the heating device 18. At least the middle part of the heating device 18 is opposite to the air outlet 6 of the wind guiding channel 4, and the air outlet 6 of the wind guiding channel 4 can cover the middle part of the heating device 18; and the structure at the air outlet 6 of the wind guiding channel 4 extends horizontally to the two sides in the circumferential direction, and the horizontal side walls perpendicular to the axial direction at the air outlet 6 of the wind guiding channel 4 extend to the two sides of the middle part of the heating device 18 respectively; so that the air flow discharged from the wind guiding channel 4 will be guided to flow to the two sides of the middle part of the heating device 18, and then the air flow discharged from the wind guiding channel 4 can contact the heating device 18 more evenly, so that the air flow is evenly heated on the heating device 18 and a more evenly distributed high-temperature drying air flow is formed. Preferably, the central axis of the wind guiding channel 4 is arranged opposite to the central axis of the heating device 18. That is, the middle part of the heating device 18 is exactly located in the middle of the air outlet 6 of the wind guiding channel 4, so that the two side guiding plates 13 on both sides extend exactly to the two sides of the central axis of the heating device 18 respectively, and then the air flow guided out from the side guiding plates 13 flows symmetrically to the left and right to the heating device 18, so that the air flow discharged from the wind guiding channel 4 is heated more evenly, and a uniform high-temperature drying air flow is formed after being heated.

[0047] In a partial drying device, it is necessary for the drying air flow to be able to change direction, that is, the flow direction of the air flow discharged from the volute 1 can change. As shown in the figure, in the air duct structure provided in this embodiment, a straight blade fan 19 that can rotate forward and backward is arranged in the volute 1. The straight blade fan 19 is used to change the direction of the drying air flow, and the straight blade fan 19 can make the air flow rate before and after the flow direction change similar while changing the flow direction of the air flow. A volute tongue is usually arranged in the volute. Through the arrangement of the volute tongue, the air flow generated in the volute is facilitated to be discharged, and it will not continuously circulate inside the volute 1 and cannot be discharged. In the air duct structure provided in this embodiment, since the air flow in the volute 1 needs to change direction, if the structure of the volute tongue is fixed, it will not be suitable for guiding the air flow in the volute 1 to flow out under the condition of air flow change. Therefore, the volute 1 provided in this embodiment has a structure without a volute tongue inside. The structure of the volute 1 without a volute tongue may make the wind speed distribution uneven at each place on the cross section of the air duct of the volute 1, and ultimately may cause local overheating of the heating device 18 due to a small air volume, and may even burn out seriously in severe cases. Therefore, this embodiment also arranges a wind guiding channel 4 at the position of the air outlet 3 of the volute 1. Through the arrangement of the wind guiding channel 4, the air flow flowing to the heating device 18 is made more uniform and divergent, and the local overheating of the heating device will not occur. The air duct structure provided in this embodiment is reasonably arranged, so that the air flow discharged from the volute 1 can flow uniformly to the heating device 18 and be evenly heated on the heating device 18 to form a uniform high-temperature drying air flow.

[0048] As shown in the figure, the air duct structure provided in this embodiment includes a volute 1, a straight blade fan 19 embedded in the volute 1, and a wind guiding channel 4 extending from the air outlet 3 to the heating device 18 is arranged at the air outlet 3 of the volute 1. That is, the air duct structure includes a volute 1, a wind guiding channel 4, and a heating device 18 connected in sequence from bottom to top, so that the air flow generated by the straight blade fan 19 in the volute 1 first flows to the wind guiding channel 4, and after being processed by the wind guiding channel 4, a uniform and divergent air flow is formed. Then the air flow guided by the wind guiding channel 4 flows uniformly and divergently to the heating device 18, so that the wind speed and air volume distribution at each position on the heating device 18 are uniform, and finally uniform heating is achieved. As shown in the figure, the volute 1, the straight blade fan 19, the wind guiding channel 4, and the heating device 18 are all axisymmetric structures. Therefore, in order to make the air flow at each place in the above air duct structure flow more smoothly and the wind guiding channel 4 is more convenient for generating a uniform and divergent air flow in the air duct structure, the axes of symmetry of the volute 1, the straight blade fan 19, the wind guiding channel 4, and the heating device 18 need to be arranged along the same straight line. That is, the structure settings at each place in the air duct structure provided in this embodiment are reasonable, which is convenient for finally outputting a uniform drying air flow.

[0049] Embodiment 3

[0050] Based on the above embodiments, this embodiment provides a dryer. The interior of the dryer is provided with the air duct structure as described in the above embodiments, and it includes a drum inside. The drum and the fan 2 in the air duct structure share one motor. For a dryer, the drum needs to rotate forward and backward. The driving motor of the drum needs to drive the drum to rotate forward and backward, so the driving motor needs to be able to rotate forward and backward. And in order to save costs and space, this motor also drives the fan 2 in the air duct structure. Therefore, the fan 2 needs to be set as a fan that can rotate forward and backward, and the corresponding volute 1 needs to be set as a volute 1 structure that can adapt to the forward and backward rotation of the fan 2. That is, the volute 1 can be set as the structure without a volute tongue as described above. And because there is no volute tongue, to control the uniform distribution of the flow velocity at each part inside the volute 1, a wind guiding channel 4 needs to be set near the air outlet 3. The wind guiding channel 4 is used to guide the air flow at the air outlet 3 to be evenly distributed, thereby avoiding local overheating from affecting the drying effect.

[0051] The dryer provided in this embodiment can use one motor to drive the drum and the fan in the air duct structure to rotate simultaneously, thereby saving costs and space. And when the drum needs to rotate forward and backward, it will correspondingly cause the fan to rotate forward and backward. The straight vane fan provided in this embodiment can achieve the same air flow rate in both the forward and backward rotation cases, avoiding affecting the drying effect. And the dryer provided in this embodiment is internally provided with the above air duct structure, so that when the air flow in the volute rotates forward and backward, the air flow discharged from the volute can be evenly heated and finally form a uniformly distributed high-temperature drying air flow, ensuring that the object to be dried is evenly dried and preventing local overheating.

[0052] The above description is only a preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art of this patent, without departing from the scope of the technical solution of the present invention, can make some changes or modifications to the above-disclosed technical content to obtain equivalent embodiments with equivalent changes. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An air duct structure includes a volute (1), a fan (2) is arranged inside the volute (1), and an air outlet (3) for air flow to discharge. It is characterized in that, A heating device (18) is provided in the air duct structure; A wind guiding channel (4) is provided at the air outlet (3) of the volute (1); the wind guiding channel (4) is an air flow channel that gradually narrows from both ends to the middle; The wind guiding channel (4) is formed by two wind guiding side plates (13), and the two wind guiding side plates (13) are respectively located on the circumferential two sides close to the air outlet (3) of the volute (1), and the two wind guiding side plates (13) are symmetrically arranged along the axis of the wind guiding channel (4); The air inlet (5) of the wind guiding channel (4) is embedded in the air outlet (3) of the volute (1): part of the structures of the two wind guiding side plates (13) extend into the air outlet and are embedded in the air outlet; The air outlet (6) of the wind guiding channel (4) is embedded in the heating device housing: part of the structures of the two wind guiding side plates (13) extend to the outside of the volute (1) and are embedded in the heating device housing; Part of the structure of the heating device (18) in the heating device housing is embedded in the air outlet (6) of the wind guiding channel (4).

2. The air duct structure according to claim 1, characterized in that, The wind guiding channel (4) gradually narrows from the air inlet (5) to the middle to form a first flared structure (7), and the wind guiding channel (4) gradually narrows from the air outlet (6) to the middle to form a second flared structure (8), and the first flared structure (7) is connected to the second flared structure (8) in the middle of the wind guiding channel (4).

3. The air duct structure according to claim 2, wherein, The first flared structure (7) includes a first tapered section (9) near the air inlet (5), and the side wall slope of the first tapered section (9) forming a cone is a fixed value; The first tapered section (9) is connected to a second tapered section (10) extending towards the middle of the wind guiding channel (4), and the side wall slope of the second tapered section (10) forming a cone is a fixed value, and the slope is relatively reduced compared to the first tapered section (9); The second flared structure (8) includes a third tapered section (11) near the air outlet (6), and the side wall slope of the third tapered section (11) forming a cone is a fixed value; The third tapered section (11) is connected to a fourth tapered section (12) extending towards the middle of the wind guiding channel (4), and the side wall slope of the fourth tapered section (12) forming a cone is a fixed value, and the slope is relatively reduced compared to the third tapered section (11); The second tapered section (10) and the fourth tapered section (12) are connected.

4. The air duct structure according to claim 3, characterized in that, Arc transitions are provided at the connection positions of the tapered sections with different slopes in the wind guiding channel (4).

5. A wind duct structure according to claim 1, characterized in that The top surface (14) in the vertical direction of the wind guiding side plate (13) and the top wall (15) in the vertical direction at the air outlet (3) of the volute (1) are in the same plane, and the bottom surface (16) in the vertical direction of the wind guiding side plate (13) and the bottom wall (17) in the vertical direction at the air outlet (3) of the volute (1) are in the same plane.

6. A wind duct structure according to claim 5, characterized in that The top surface (14) in the vertical direction of the wind guiding side plate (13) abuts against the top wall (15) in the vertical direction at the air outlet (3) of the volute (1), and the bottom surface (16) in the vertical direction of the wind guiding side plate (13) abuts against the bottom wall (17) in the vertical direction at the air outlet (3) of the volute (1).

7. A wind duct structure according to any one of claims 1-6, characterized in that The air outlet (6) of the air guiding channel (4) is arranged opposite to the heating device (18), and at least the middle part of the heating device (18) is opposite to the air outlet (6) of the air guiding channel (4); The horizontal side walls perpendicular to the axial direction at the air outlet (6) of the air guiding channel (4) extend respectively to both sides of the middle part of the heating device (18).

8. A duct structure according to claim 7, characterized in that The central axis of the air guiding channel (4) is arranged opposite to the central axis of the heating device (18).

9. The air duct structure according to claim 8, characterized in that, A straight blade fan (19) capable of rotating forward and backward is arranged inside the volute (1), and the inside of the volute (1) has a structure without a volute tongue.

10. A duct structure according to claim 9, characterized in that The straight blade fan (19) is embedded in the volute (1); the volute (1), the straight blade fan (19), the air guiding channel (4), and the heating device (18) are all axisymmetric structures, and the symmetry axes of the volute (1), the straight blade fan (19), the air guiding channel (4), and the heating device (18) are arranged along the same straight line.

11. A dryer, characterized in that, Inside is provided a duct structure as described in any one of claims 1-10. Inside the dryer, a drum is further provided, and a motor for driving the drum and the fan (2) in the duct structure to rotate forward and backward is provided.

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