Duct structure of a care appliance and care appliance

Abstract

The utility model discloses a nursing appliance's air duct structure and nursing appliance. The nursing appliance's air duct structure includes: the cylinder, the inner wall of cylinder is enclosed and forms first air duct, and one end of first air duct is air outlet, the air inlet duct is linked with the lateral wall of cylinder and communicates with the other end of first air duct, and the lateral wall of air inlet duct is equipped with first air inlet, and the lateral wall of cylinder is equipped with opening adjacent to the lateral wall of air inlet duct for introducing the airflow in handle interior into air inlet duct. The external airflow introduced from air duct and the external airflow introduced from handle converge in air inlet duct, and the phenomenon of head-on is not produced, which can not only reduce the airflow loss, but also can improve the air intake, and also can reduce the airflow noise.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, and in particular to a fan structure and a nursing device. Background Technology

[0002] In existing nursing devices, the heating and fan components are mostly installed inside the air duct, and the control panel is mostly installed inside the handle. When the external airflow introduced from the handle flows into the air duct inside the air duct, it will collide with the external airflow introduced from the air duct. Because the airflow and air pressure introduced from the air duct are large, the airflow from the handle will be less or even not generated. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a duct structure for a nursing device, in which the external airflow introduced from the duct and the external airflow introduced from the handle converge in the air inlet duct, avoiding the collision phenomenon, reducing airflow loss, increasing airflow volume, and also reducing airflow noise.

[0004] This utility model further proposes a nursing device.

[0005] The air duct structure of the nursing device according to the first aspect of the present invention includes a cylinder body, the inner wall of the cylinder body forming a first air duct, one end of the first air duct being an air outlet; and an air inlet duct, the air inlet duct being connected to the side wall of the cylinder body and communicating with the other end of the first air duct, the side wall of the air inlet duct being provided with a first air inlet, and the side wall of the cylinder body adjacent to the side wall of the air inlet duct being provided with an opening for introducing airflow from inside the handle into the air inlet duct.

[0006] According to the air duct structure of the nursing device in this embodiment of the present invention, by setting the opening of the side wall of the cylinder adjacent to the side wall of the air inlet duct, and setting the first air inlet on the side wall of the air inlet duct, it is possible to effectively avoid the stronger first fluid causing the flow of the second fluid to be suppressed, thereby effectively reducing airflow loss. Furthermore, the first fluid flows in a roughly radial state, and the second fluid flows in a roughly axial state, so that the first fluid can more easily entrain the second fluid in the handle to generate more second fluid, increase the air intake, and at the same time, it will not cause noise increase due to the collision.

[0007] According to some embodiments of the present invention, the air inlet duct includes: an air duct frame, the air duct frame having a conical structure and its large end being connected to the side wall of the cylinder, the side wall of the air duct frame being provided with the first air inlet; and a first filter element, the first filter element being arranged around the side wall of the air duct frame and covering the first air inlet.

[0008] By covering the side wall of the air duct frame with the first filter element, an air duct for the first fluid is formed inside the air duct frame. When the first fluid entering from the first air inlet passes through the first filter element, it can be diverted, thereby achieving the effect of filtering and noise reduction.

[0009] According to some embodiments of the present invention, the air inlet duct further includes: a second filter element, the second filter element being disposed within the duct frame and surrounding the inner side of the first filter element, an intermediate channel being formed between the first filter element and the second filter element, and the opening communicating with the intermediate channel.

[0010] By placing the second filter element inside the first filter element, a two-layer filtration system is formed, further improving the diversion filtration effect. Furthermore, the second fluid entering from the handle enters the intermediate channel defined between the first and second filters through the opening. This achieves secondary filtration not only for the first fluid but also for the second fluid, effectively improving the airflow uniformity of both fluids entering the air intake duct. In addition, the first and second filters not only filter air but also prevent impurities such as flying insects and dust particles from entering.

[0011] According to some embodiments of the present invention, a fan unit is provided inside the cylinder. The fan unit includes a fan and a fan housing. The fan is installed in the fan housing. The fan housing is located in the first air duct at one end adjacent to the air inlet duct. The air inlet duct is connected to the fan housing.

[0012] By bringing the air inlet channel at the rear end of the cylinder closer to the fan, when the fan is in operation, the first and second fluids can be directly drawn into the fan casing after mixing through the air inlet channel. This shortens the fluid flow path and effectively improves the air intake volume and efficiency.

[0013] According to some embodiments of the present invention, the duct frame includes an outer frame and an inner frame, the inner frame being arranged around the inner side of the outer frame, the side wall of the outer frame being provided with the first filter element, and the side wall of the inner frame being provided with the second filter element; one end of the outer frame is abutting and connected to the side wall of the cylinder, and one end of the inner frame is overlapping and connected to one end of the fan housing.

[0014] By setting up an outer frame and an inner frame, the first and second filter elements can be supported and fixed respectively. Furthermore, the end of the inner frame near the fan housing overlaps and is fixed to the end of the fan housing, ensuring that the first and second fluids in the air inlet duct can flow unobstructed into the fan housing, guaranteeing maximum air intake. Simultaneously, the end of the outer frame near the fan housing abuts and is fixed to the side wall of the cylinder, forming an intermediate channel between the outer and inner frames that connects to the opening. The connection between the outer frame and the side wall of the cylinder ensures stable air intake for the outer frame.

[0015] According to some embodiments of the present invention, the outer wall of the fan housing is provided with a radially extending connecting portion and the radial end of the connecting portion is connected to the inner wall of the cylinder. The connecting portion is disposed adjacent to and connected to the side wall of the cylinder. The connecting portion is provided with an opening communicating with the opening.

[0016] By positioning the connecting part close to the side wall of the cylinder and connecting it to the side wall, the fan casing is fixedly installed. Furthermore, because the connecting part is positioned close to the side wall of the cylinder, it is provided with an opening to correspond to the opening on the side wall of the cylinder, thus preventing the connecting part from blocking the opening. In this way, the second fluid entering from the handle sequentially passes through the opening and the opening into the air inlet channel, achieving the convergence of the second fluid and the first fluid.

[0017] According to some embodiments of the present invention, it further includes: a guide tube, wherein the guide tube is disposed at the air inlet end inside the cylinder body, one end of the guide tube is connected to the end of the cylinder body, and the air inlet duct is disposed in the guide tube and an air inlet channel is formed between the side wall of the air inlet duct and the guide tube.

[0018] By placing the guide tube at the air inlet, the first fluid can be guided to flow evenly towards the sidewall of the air inlet duct, reducing turbulence and irregular flow. Furthermore, by smoothing the airflow path, the resistance encountered by the first fluid upon entry can be reduced, thereby reducing energy loss and improving the fan's operating efficiency. Additionally, by optimizing the airflow direction and reducing turbulence and impact, noise caused by airflow instability is reduced, ensuring that the air intake is always in optimal condition.

[0019] According to some embodiments of the present invention, the guide tube extends from one end connected to the end of the cylinder body along the direction of the airflow of the cylinder body to form a guide portion; the guide portion extends radially from one end away from the end of the cylinder body toward the center of the axis of the cylinder body to form a sidewall of the cylinder body.

[0020] By guiding the flow through the guide section, the first fluid can be smoothly directed to the side wall of the air inlet duct, thereby improving the air intake efficiency. In addition, the guide section extends radially from one end away from the air inlet end of the cylinder towards the center line of the cylinder to form the side wall of the cylinder, thereby connecting the large end of the air inlet duct to the side wall of the cylinder and simplifying the structure of the air inlet end of the cylinder.

[0021] According to some embodiments of the present invention, the guide tube is a gradually narrowing arc-shaped tube from the air inlet end to the air outlet end, and the end of the tube body is bent inward and connected to one end of the guide tube.

[0022] By designing the guide tube as a trumpet-shaped flow surface, the first fluid smoothly transitions from a larger cross-section to a narrower cross-section, reducing eddies and turbulence caused by sudden changes, thereby lowering air resistance at the air inlet. Compared to right angles or abrupt changes, the gradually changing trumpet-shaped structure effectively reduces local pressure loss and improves the overall system efficiency. Secondly, the trumpet-shaped flow surface helps to distribute the first fluid more evenly in the air inlet duct, avoiding excessively high velocities or low-pressure zones in certain areas. It also prevents airflow from deviating to one side, ensuring airflow consistency. Furthermore, the trumpet shape increases the effective suction area, allowing airflow to be drawn in over a wider area, increasing the intake volume. Simultaneously, by reducing the formation of turbulence and eddies, noise generated by irregular airflow movement can be significantly reduced.

[0023] According to a second aspect of the present invention, a nursing device includes a blower structure and a handle. The inner wall of the handle forms a second air duct. One end of the handle is provided with a second air inlet, and the opposite end is connected to the blower body. The second air duct is connected to the air inlet duct through the opening.

[0024] In this embodiment of the nursing device, when the blower is started, the second fluid enters the second air duct inside the handle through the second air inlet. When the second fluid reaches the cylinder, it flows into the air inlet duct through the opening, where it merges with the first fluid. Finally, it enters the first air duct, is heated, and then blown out. Compared to the prior art where the first and second fluids flow in roughly opposing axial directions, this embodiment avoids the first and second fluids merging in opposing directions, thus preventing airflow loss and increasing the air intake volume, effectively improving the blower's working efficiency.

[0025] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0027] Figure 1 This is an overall schematic diagram of the nursing device according to an embodiment of the present utility model;

[0028] Figure 2 This is a cross-sectional schematic diagram of a nursing device according to an embodiment of the present utility model;

[0029] Figure 3 This is a cross-sectional schematic diagram of a partial structure of a nursing device according to an embodiment of the present utility model;

[0030] Figure 4 This is an airflow convergence diagram of the internal air duct of the nursing device according to an embodiment of the present utility model;

[0031] Figure 5 This is a schematic diagram of a partial internal structure of the air duct structure of a nursing device according to an embodiment of the present utility model. Figure 1 ;

[0032] Figure 6 This is a schematic diagram of a partial internal structure of the air duct structure of a nursing device according to an embodiment of the present utility model. Figure 2 ;

[0033] Figure 7 This is a schematic diagram of a partial internal structure of the air duct structure of a nursing device according to an embodiment of the present utility model. Figure 3 ;

[0034] Figure 8 This is a partial cross-sectional schematic diagram of the wind tunnel structure according to an embodiment of the present utility model.

[0035] Figure label:

[0036] 100. Duct structure; 10. Duct body; 11. First air duct; 12. Air outlet; 20. Air inlet duct; 21. First air inlet; 22. Duct frame; 2201. Outer frame; 2202. Inner frame; 23. First filter element; 24. Second filter element; 25. Intermediate channel; 30. Side wall of the duct body; 40. Opening; 50. Guide tube; 51. Guide section; 60. Air inlet channel; 70. Fan unit; 71. Fan; 72. Fan housing; 73. Connecting part; 74. Opening; 80. Mounting frame; 90. Heating unit; 200. Handle; 210. Second air duct; 220. Second air inlet; 230. Control unit. Detailed Implementation

[0037] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0038] The following is for reference. Figures 1-8 This invention describes the structure of a ventilation duct and the nursing device according to an embodiment of the present invention.

[0039] like Figures 1-4 , Figure 8 As shown, the nursing device in this embodiment includes: a blower structure 100, a handle 200, a heating unit 90, a fan unit 70, and a control unit 230. The fan unit 70 is used for air intake and exhaust, the heating unit 90 is used for heating the air, and the control unit 230 is electrically connected to both the fan unit 70 and the heating unit 90, thereby controlling the operating states of the fan unit 70 and the heating unit 90. In this embodiment, the fan unit 70 and the heating unit 90 are located in the blower structure 100, and the control unit 230 is located in the handle 200.

[0040] like Figure 3 , Figure 8 and Figure 4 As shown, the ventilation duct structure 100 includes a cylinder 10 and an air inlet duct 20. The inner wall of the cylinder 10 forms a first air duct 11, one end of which is an air outlet 12. The air inlet duct 20 is connected to the side wall 30 of the cylinder and communicates with the other end of the first air duct 11. The side wall of the air inlet duct 20 is provided with a first air inlet 21.

[0041] Specifically, one end of the air inlet duct 20 is connected to the side wall 30 of the cylinder, and this end of the air inlet duct 20 is connected to the air inlet end of the first air duct 11 to form a blowing airflow channel of the air duct structure 100. When the user uses the nursing device, the external airflow enters the air inlet duct 20 through the first air inlet 21 and flows to the first air duct 11, and is finally blown out from the air outlet 12 of the first air duct 11.

[0042] Furthermore, the side wall 30 of the cylinder is provided with an opening 40 adjacent to the side wall of the air inlet duct 20 for introducing the airflow inside the handle 200 into the air inlet duct 20.

[0043] It should be noted that the side wall 30 of the cylinder is a structure inside the cylinder 10 that is different from the inner wall of the cylinder 10. One end of the side wall 30 of the cylinder can be connected to the inner wall of the cylinder 10, and it can be extended toward the center of the axis of the cylinder 10 in a radial or non-radial direction. The side wall 30 of the cylinder has functions such as supporting related components and / or guiding airflow.

[0044] Specifically, one side of the opening 40 is used to connect with the air inlet duct 20, and the other side is used to connect with the interior of the handle 200. With this configuration, when the fan unit 70 is operating, external airflow is not only drawn into the air inlet duct 20 through the first air inlet 21, but also drawn into the interior of the handle 200, and guided into the air inlet duct 20 through the opening 40 of the side wall 30 of the cylinder. Thus, the airflow entering from the handle 200 and the airflow entering from the first air inlet 21 merge in the air inlet duct 20 and flow together into the first air duct 11, finally being blown out from the air outlet 12. The airflow entering from the first air inlet 21 is the main airflow, with a large volume and high pressure, while the airflow entering from the handle 200 is the auxiliary airflow.

[0045] For ease of description, the airflow entering from the first air inlet 21 will be referred to as the first fluid, and the airflow entering from the handle 200 will be referred to as the second fluid. The following description will use the first fluid and the second fluid as the basis for explanation.

[0046] The air inlet duct 20 has a first air inlet 21 on its side wall, and an opening 40 is located adjacent to the side wall of the air inlet duct 20. This arrangement, as... Figure 3 , Figure 8 As shown, the first fluid entering from the first air inlet 21 flows into the air inlet duct 20 in a direction roughly perpendicular to the side wall of the air inlet duct 20, while the second fluid entering from the opening 40 flows into the air inlet duct 20 in a direction roughly away from the airflow of the cylinder 10, and the first fluid and the second fluid intersect at the side wall of the air inlet duct 20.

[0047] This configuration offers several advantages. First, compared to existing technologies where the first and second fluids converge in an opposing manner, this embodiment prevents the flow of the second fluid from being suppressed due to the stronger first fluid, thus effectively reducing airflow loss. Second, at this convergence point, the first fluid flows approximately radially, while the second fluid flows approximately axially. This allows the first fluid to more easily entrain the second fluid within the handle 200, generating more second fluid and increasing the air intake. Furthermore, it effectively avoids the noise increase problem caused by opposing flow.

[0048] In addition, the first air inlet 21 is located on the side wall of the air inlet duct 20, so that the airflow passes through the air inlet duct 20 and then enters the first air duct 11, thus flowing towards the fan 71. This arrangement allows the airflow to be guided and diverted before entering the fan 71. Compared with direct air intake from the end of the cylinder 10, this design helps to improve the uniformity of airflow and cooling efficiency.

[0049] Therefore, by placing the first air inlet 21 on the side wall of the air inlet duct 20 and placing the opening 40 of the side wall 30 of the cylinder adjacent to the side wall of the air inlet duct 20, the first fluid and the second fluid can converge at the side wall of the air inlet duct 20. This effectively avoids collision and prevents the flow of the second fluid from being suppressed due to the stronger first fluid, thereby effectively reducing airflow loss. Furthermore, the first fluid flows in a roughly radial state and the second fluid flows in a roughly axial state, making it easier for the first fluid to entrain the second fluid in the handle 200 to generate more second fluid and increase the air intake. In addition, it effectively avoids noise increase caused by collision and effectively improves the low-noise effect of the nursing device.

[0050] Furthermore, the air inlet duct 20 includes: an air duct frame 22 and a first filter element 23. The air duct frame 22 has a conical structure, and the large end of the air duct frame 22 is connected to the side wall 30 of the cylinder. The side wall of the air duct frame 22 is provided with a first air inlet 21. The first filter element 23 is arranged around the side wall of the air duct frame 22 and covers the first air inlet 21.

[0051] In this embodiment, such as Figure 3 and Figure 7 , Figure 8 As shown, the duct frame 22 has a tapered structure that gradually expands from one end to the other, making one end of the duct frame 22 a large end and the other end a small end. The large end of the duct frame 22 is connected to the side wall 30 of the cylinder, and a first filter element 23 is covered at the first air inlet 21 on the side wall of the duct frame 22. In this way, the side wall of the duct frame 22 is covered so that an air duct for the first fluid is formed inside the duct frame 22. Furthermore, the first fluid entering from the first air inlet 21 can be diverted when passing through the first filter element 23, achieving a filtering and noise reduction effect.

[0052] Furthermore, the air inlet duct 20 also includes a second filter element 24, which is disposed within the duct frame 22 and is arranged around the inner side of the first filter element 23. An intermediate channel 25 is formed between the first filter element 23 and the second filter element 24, and the opening 40 is connected to the intermediate channel 25.

[0053] In this embodiment, such as Figure 3 , Figure 8As shown, a second filter element 24 is also provided inside the air duct frame 22. The second filter element 24 is arranged around the inner side of the first filter element 23, thus forming a two-layer filtration barrier to further improve the diversion filtration effect. Furthermore, an intermediate channel 25 is defined between the first filter element 23 and the second filter element 24, with one side of the opening 40 connected to the intermediate channel 25. With this configuration, the second fluid entering from the handle 200 enters the intermediate channel 25 through the opening 40, and then, along with the first fluid, is filtered and diverted by the second filter element 24 before entering the air inlet duct 20. This achieves secondary filtration for both the first and second fluids, effectively improving the airflow uniformity of the first and second fluids entering the air inlet duct 20. A third filter element is provided at the handle 200, so the second fluid has already been filtered once upon entering the handle 200.

[0054] In some embodiments, the first filter element 23 and the second filter element 24 can be filter screens. For example, the filter screen can be a diamond mesh with fine pores, which can not only filter air, but also block impurities such as flying insects and dust particles from entering.

[0055] Furthermore, a fan unit 70 is provided inside the cylinder 10. The fan unit 70 includes a fan 71 and a fan housing 72. The fan 71 is installed in the fan housing 72. The fan housing 72 is located in the first air duct 11 at one end adjacent to the air inlet duct 20. The air inlet duct 20 is connected to the fan housing 72.

[0056] In this embodiment, such as Figure 3 , Figure 8 As shown, the fan housing 72 is located at one end of the first air duct 11 adjacent to the air inlet duct 20, and the fan housing 72 is connected to the air inlet duct 20. With this arrangement, the air inlet channel 60 at the rear end of the cylinder 10 is closer to the fan 71. When the fan 71 is in operation, the first fluid and the second fluid are directly drawn into the fan housing 72 through the air inlet duct 20, thus shortening the fluid path and effectively improving the air intake volume and air intake efficiency.

[0057] Furthermore, the duct frame 22 includes an outer frame 2201 and an inner frame 2202. The inner frame 2202 is arranged around the inner side of the outer frame 2201. The side wall of the outer frame 2201 is provided with a first filter element 23, and the side wall of the inner frame 2202 is provided with a second filter element 24. One end of the outer frame 2201 is abutted and connected to the side wall 30 of the cylinder, and one end of the inner frame 2202 is overlapped and connected to one end of the fan housing 72.

[0058] In this embodiment, such as Figure 3 , Figure 8As shown, the duct frame 22 has an inner frame 2202 and an outer frame 2201. The first filter element 23 is disposed on the side wall of the outer frame 2201, and the second filter element 24 is disposed on the side wall of the inner frame 2202, so that the duct frame 22 provides support and fixation for the first filter element 23 and the second filter element 24. Furthermore, the end of the inner frame 2202 near the fan housing 72 overlaps with and connects to the end of the fan housing 72, ensuring that the first and second fluids in the air inlet duct 20 can flow unobstructed into the fan housing, guaranteeing maximum air intake. Additionally, the end of the outer frame 2201 near the fan housing 72 abuts against the side wall 30 of the cylinder, and can be connected and fixed to the side wall 30 of the cylinder by means of snap-fit, screw connection, or other connection methods.

[0059] Thus, one end of the outer frame 2201 is connected to the side wall 30 of the cylinder, and one end of the inner frame 2202 is connected to the end of the fan housing 72. An intermediate channel 25 is formed between the outer frame 2201 and the inner frame 2202, thereby communicating with the opening 40 of the side wall 30 of the cylinder. In this embodiment, as shown... Figure 8 As shown, the gap between the end of the side wall 30 of the cylinder and the outer wall of the fan housing 72 is the opening 40 provided in the side wall 30 of the cylinder.

[0060] Furthermore, the outer wall of the fan housing 72 is provided with a radially extending connecting portion 73, and the radial end of the connecting portion 73 is connected to the inner wall of the cylinder 10. The connecting portion 73 is disposed adjacent to and connected to the side wall 30 of the cylinder, and the connecting portion 73 is provided with an opening 74 communicating with the opening 40.

[0061] In this embodiment, such as Figure 3 , Figure 8 , Figure 5 and Figure 6 As shown, the outer wall of the fan housing 72 is provided with a radially extending connecting portion 73. The connecting portion 73 has an annular frame structure, and its radial end is connected to the inner wall of the cylinder 10. The connecting portion 73 is located adjacent to and connected to the side wall 30 of the cylinder, thereby achieving the fixed installation of the fan housing 72. In addition, a mounting frame 80 is also provided inside the cylinder 10. The mounting frame 80 is located inside the first air duct 11 and is fixedly connected to the inner wall of the cylinder 10. The fan unit 70 and the heating unit 90 are both located inside the mounting frame 80, and the connecting portion 73 of the fan housing 72 is fixedly connected to the mounting frame 80.

[0062] Furthermore, since the connecting part 73 is located close to the side wall 30 of the cylinder, the connecting part 73 is provided with an opening 74 to correspond to the opening 40 of the side wall 30 of the cylinder, thereby preventing the connecting part 73 from blocking the opening 40. In this way, the second fluid entering from the handle 200 passes through the opening 74 and the opening 40 in sequence into the air inlet channel 60, realizing the convergence of the second fluid and the first fluid.

[0063] Furthermore, the duct structure 100 also includes a guide tube 50, which is located at the air inlet end inside the tube body 10. One end of the guide tube 50 is connected to the end of the tube body 10. An air inlet duct 20 is located in the guide tube 50, and an air inlet channel 60 is formed between the side wall of the air inlet duct 20 and the guide tube 50.

[0064] In this embodiment, such as Figure 3 and Figure 6 , Figure 8 As shown, the guide tube 50 is disposed inside the air inlet end of the cylinder 10. One end of the guide tube 50 is connected to the air inlet end of the cylinder 10, and the air inlet duct 20 is disposed inside the guide tube 50. Specifically, the first fluid enters the air inlet channel 60 between the air inlet duct 20 and the guide tube 50 from one side of the air inlet end of the cylinder 10. Under the guiding action of the guide tube 50, the first fluid is guided to the side wall of the air inlet duct 20 and enters the air inlet duct 20 through the first air inlet 21.

[0065] Therefore, the design of the guide tube 50 guides the first fluid to flow evenly towards the sidewall of the air inlet duct 20, reducing turbulence and irregular flow. Furthermore, by smoothing the airflow path, the resistance encountered by the first fluid upon entry is reduced, thereby lowering energy loss and improving the operating efficiency of the fan 71. Additionally, optimizing the airflow direction and reducing turbulence and impact helps reduce noise caused by airflow instability, ensuring that the air intake is always in optimal condition.

[0066] Furthermore, the guide tube 50 extends from one end connected to the end of the cylinder 10 along the direction of the airflow of the cylinder 10 to form a guide section 51. The guide section 51 extends radially from one end away from the end of the cylinder 10 toward the center of the axis of the cylinder 10 to form a side wall 30 of the cylinder.

[0067] In this embodiment, as Figure 3 , Figure 8 As shown, the guide tube 50 extends from one end of the connecting cylinder 10 at the air inlet end along the direction of the airflow of the cylinder 10 to form a guide section 51. Furthermore, the guide section 51 extends radially towards the centerline of the cylinder 10 from one end away from the air inlet end to form a side wall 30 of the cylinder, so that the large end of the air inlet duct 20 is connected to the side wall 30 of the cylinder. Of course, the side wall 30 of the cylinder can also be a separate structure, connected to the guide tube 50.

[0068] Furthermore, the guide tube 50 is a gradually narrowing arc-shaped tube from the air inlet end to the air outlet end, and the end of the tube body 10 is bent inward and connected to one end of the guide tube 50.

[0069] In this embodiment, the guide tube 50 tapers from the air inlet to the air outlet, and the guide portion 51 bends towards the center of the guide tube 50, forming an arc-shaped surface, giving the guide tube 50 a trumpet-shaped guide surface. This design, firstly, allows the first fluid to smoothly transition from a larger cross-section to a narrower cross-section, reducing eddies and turbulence caused by sudden changes, thereby lowering air resistance at the air inlet. Compared to right angles or abrupt changes, the gradual trumpet-shaped structure effectively reduces local pressure loss and improves the overall system efficiency. Secondly, the trumpet-shaped guide surface helps to distribute the first fluid more evenly in the air inlet duct 20, avoiding excessively high speeds or low-pressure areas in certain regions. It also prevents airflow from deviating to one side, ensuring airflow consistency. Furthermore, the trumpet shape effectively increases the effective suction area, allowing airflow to be drawn over a larger area, increasing the intake volume. Simultaneously, by reducing the formation of turbulence and eddies, noise generated by irregular airflow movement can be significantly reduced.

[0070] According to the second aspect of the present invention, a nursing device includes a blower structure 100 and a handle 200. The inner wall of the handle 200 forms a second air duct 210. One end of the handle 200 is provided with a second air inlet 220, and the other end is connected to the cylinder 10. The second air duct 210 is connected to the air inlet duct 20 through an opening 40.

[0071] Specifically, when the blower 71 is operating, the second fluid enters the second air duct 210 inside the handle 200 through the second air inlet 220. When the second fluid reaches the cylinder 10, it can flow into the air inlet duct 20 through the opening 40, thereby converging with the first fluid within the air inlet duct 20, and finally entering the first air duct 11 for heating and then being blown out. Thus, compared to the prior art where the first and second fluids flow in roughly opposing axial directions, the arrangement of the blower structure 100 in this embodiment avoids the first and second fluids converging in opposing directions, preventing airflow loss while increasing the air intake volume, effectively improving the working efficiency of the blower 71. Furthermore, the vertical projection of the blower 71 at least partially overlaps with the handle 200, which is beneficial for providing stability to the blower structure 100 and facilitating user handheld operation.

[0072] Furthermore, a control unit 230 is provided inside the handle 200, and the control unit 230 is located inside the second air duct 210. In this way, when the second fluid flows through the second air duct 210, the control unit 230 can be cooled and dissipated. In addition, a heating unit 90 is provided inside the cylinder 10, and the heating unit 90 and the fan unit 70 are arranged sequentially in the first air duct 11, with the heating unit 90 located at one end of the first air duct 11 near the air outlet 12.

[0073] Therefore, in this embodiment, the fan unit 70 is located at the rear end of the air duct structure 100, so that the air inlet channel 60 is closer to the fan 71. This shortens the fluid path, and the first fluid and the second fluid will not cancel each other out at the intersection of the air inlet channel 20, while also increasing the air intake volume. That is, the motor and fluid path are set up more reasonably, which can improve the stability of the fixed structure of the fan unit 70 while increasing the air intake volume, thus improving the user experience.

[0074] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0076] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A ventilation duct structure for a nursing device, characterized in that, include A cylindrical body, the inner wall of which encloses a first air duct, one end of which is an air outlet; An air inlet duct is provided, which is connected to the side wall of the cylinder and communicates with the other end of the first air duct. The side wall of the air inlet duct is provided with a first air inlet, and the side wall of the cylinder is provided with an opening adjacent to the side wall of the air inlet duct for introducing the airflow inside the handle into the air inlet duct.

2. The ventilation duct structure of the nursing appliance according to claim 1, characterized in that, The air inlet duct includes: The air duct frame is tapered and its large end is connected to the side wall of the cylinder. The side wall of the air duct frame is provided with the first air inlet. The first filter element is arranged around the side wall of the air duct frame and covers the first air inlet.

3. The ventilation duct structure of the nursing appliance according to claim 2, characterized in that, The air inlet duct also includes: The second filter element is disposed within the air duct frame and surrounds the inner side of the first filter element. An intermediate channel is formed between the first filter element and the second filter element, and the opening is connected to the intermediate channel.

4. The ventilation duct structure of the nursing appliance according to claim 3, characterized in that, The cylinder is equipped with a fan unit, which includes a fan and a fan housing. The fan is located in the fan housing, which is located in the first air duct at one end adjacent to the air inlet duct. The air inlet duct is connected to the fan housing.

5. The ventilation duct structure of the nursing appliance according to claim 4, characterized in that, The duct frame includes an outer frame and an inner frame. The inner frame is arranged around the inner side of the outer frame. The side wall of the outer frame is provided with the first filter element, and the side wall of the inner frame is provided with the second filter element. One end of the outer frame is abutted and connected to the side wall of the cylinder, and one end of the inner frame is overlapped and connected to one end of the fan housing.

6. The ventilation duct structure of the nursing appliance according to claim 4, characterized in that, The outer wall of the fan casing is provided with a radially extending connecting portion, and the radial end of the connecting portion is connected to the inner wall of the cylinder. The connecting part is disposed adjacent to and connected to the side wall of the cylinder, and the connecting part is provided with an opening communicating with the opening.

7. The ventilation duct structure of the nursing appliance according to claim 1, characterized in that, Also includes: A guide tube is provided at the air inlet end inside the cylinder body. One end of the guide tube is connected to the end of the cylinder body. The air inlet duct is provided in the guide tube, and an air inlet channel is formed between the side wall of the air inlet duct and the guide tube.

8. The ventilation duct structure of the nursing appliance according to claim 7, characterized in that, The guide tube extends from one end connected to the end of the cylinder along the direction of the airflow of the cylinder to form a guide section; The flow guide extends radially from one end away from the end of the cylinder towards the center of the cylinder axis to form the sidewall of the cylinder.

9. The ventilation duct structure of the nursing appliance according to claim 7, characterized in that, The guide tube is an arc-shaped tube that gradually narrows from the air inlet end to the air outlet end, and the end of the tube body is bent inward and connected to one end of the guide tube.

10. A nursing appliance, characterized in that, The nursing device includes a blower structure and a handle according to any one of claims 1-9, wherein the inner wall of the handle forms a second air duct, one end of the handle is provided with a second air inlet and the opposite end is connected to the cylinder body, and the second air duct is connected to the air inlet duct through the opening.

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