Blowing device

Abstract

The utility model discloses a blowing device which comprises a first air outlet cylinder, a second air outlet cylinder, a drainage device and a heating mechanism, and a first air outlet channel is formed in the first air outlet cylinder; the second air outlet cylinder is connected to the first air outlet cylinder, a drainage cavity and a second air outlet channel are formed in the second air outlet cylinder, and the second air outlet channel communicates with the drainage cavity and the first air outlet channel; the heating mechanism is arranged in the first air outlet channel and comprises a heat insulation sheet and a heating wire, the heating wire is wound around the heat insulation sheet, a plurality of heating wire sections arranged side by side are formed on the first surface and the second surface of the heat insulation sheet correspondingly, and the heating wire sections extend in the airflow direction of the first air outlet channel; the first air outlet channel and the channel inner wall of the first air outlet channel are arranged at intervals. According to the technical scheme, noise generated by the air blowing device and heating power consumption are reduced, and practicability and reliability of the air blowing device are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of blowing equipment, in particular to a blowing device. Background Art

[0002] In the related art, in order to achieve both a miniaturized structural design and a high-speed air outlet effect, the existing hair dryers mostly have shorter cylindrical structures used to gather and discharge air, and the heating components in the hair dryers need to operate at a higher power when the hair dryers are in operation to ensure that the airflow reaches an appropriate temperature.

[0003] However, the shorter air outlet cylinder will cause the hair dryer to make loud noise when blowing air at high speed, resulting in a poor user experience. In addition, the use of a higher-power heating component will cause the hair dryer to consume higher power, reducing the practicality and reliability of the hair dryer. Utility Model Content

[0004] The main purpose of the utility model is to provide a blowing device, aiming to improve the air outlet structure setting of the blowing device, reduce the noise and heating power consumption generated by the blowing device, and improve the practicality and reliability of the blowing device.

[0005] To achieve the above-mentioned purpose, the blowing device proposed by the present invention includes a first air outlet cylinder, a second air outlet cylinder, a guide device and a heating mechanism, a first air outlet channel is formed in the first air outlet cylinder, the longitudinal cross-section of the first air outlet channel is annular, the first air outlet cylinder is provided with an annular air inlet and annular air outlet connected to the first air outlet channel; the second air outlet cylinder is connected to the first air outlet cylinder and covers the annular air inlet, a guide cavity and a second air outlet channel are formed in the second air outlet cylinder, the second air outlet channel is located between the guide cavity and the first air outlet channel, and connects the guide cavity and the first air outlet channel ; The drainage device is arranged in the drainage cavity, and is used to drive the air flow to flow through the drainage cavity, the second air outlet channel and the first air outlet channel in sequence; the heating mechanism is arranged in the first air outlet channel, and the heating mechanism includes a heat insulation sheet and a heating wire. The heat insulation sheet is shaped like a hollow cylinder, and the heat insulation sheet is defined as having a first surface and a second surface opposite to each other. The heating wire is wound around the heat insulation sheet, and a plurality of heating wire segments arranged side by side are formed on the first surface and the second surface respectively. The heating wire segments extend along the airflow direction of the first air outlet channel and are spaced apart from the inner wall of the first air outlet channel.

[0006] Optionally, the blowing device also includes a mounting cylinder, in which the first air outlet tube and the second air outlet tube are installed; the mounting cylinder is provided with an air inlet cover, which is plugged into one end of the mounting cylinder and clamped to the second air outlet tube, and the air inlet cover is provided with an air inlet hole, which is connected to the drainage cavity.

[0007] Optionally, the second air outlet tube, the mounting cylinder and the air inlet cover are enclosed to form a receiving cavity, and the blowing device further includes a control circuit board, which is disposed in the receiving cavity and sleeved on the outer periphery of the second air outlet tube.

[0008] Optionally, the inner diameter of the air inlet hole is configured to gradually decrease along the air inlet direction. Alternatively, the air inlet cover is provided with an air inlet screen, which covers the air inlet hole. Alternatively, the mounting cylinder further includes an air outlet cover, which is plugged into the other end of the mounting cylinder and engages with the first air outlet tube. The air outlet cover is provided with an air outlet hole, which communicates with the annular air outlet.

[0009] Optionally, the number of the heating mechanism is one. Alternatively, the number of the heating mechanism is at least two, and the at least two heating mechanisms are sequentially and spaced apart and sleeved in the first air outlet channel.

[0010] Optionally, the thermal insulation sheet includes an insulation body and a support member, the heating wire is wound around the insulation body, and the insulation body has two ends facing the annular air inlet and the annular air outlet respectively; the support member is connected to the two ends of the insulation body and abuts against the inner wall of the first air outlet channel.

[0011] Optionally, a limit slot is provided on the inner wall of the first air outlet channel, and the support member is engaged with the limit slot. And / or a heat insulation layer is provided on the inner wall of the first air outlet channel.

[0012] Optionally, the first air outlet channel is defined as having a first inner wall and a second inner wall facing each other, with the first inner wall facing the first surface of the thermal insulation sheet, and the second inner wall facing the second surface of the thermal insulation sheet. The spacing between the first inner wall and the heating wire segment on the first surface is defined as W1, and the spacing between the second inner wall and the heating wire segment on the second surface is defined as W2, where 0.5≤W2 / W1≤1.

[0013] Optionally, the first air outlet tube includes a first cylinder and a second cylinder. A position-limiting connector is provided in the first cylinder, and a plurality of first ribs are provided on the outer periphery of the position-limiting connector, with one end of the first rib facing away from the position-limiting connector connected to the inner wall of the first cylinder. The second cylinder is detachably provided in the first cylinder and is engaged with the position-limiting connector. A plurality of second ribs are provided on the outer wall of the second cylinder, with one end of the second rib facing away from the second cylinder abutting against the inner wall of the first cylinder. The outer wall of the second cylinder and the inner wall of the first cylinder together form the first air outlet channel. The position-limiting connector and the first ribs are provided at the annular air outlet, and the second ribs are provided at the annular air inlet. The opposing side walls of the first rib and the second rib are respectively provided with slots, and the two ends of the thermal insulation sheet are respectively engaged with the slots of the first rib and the slots of the second rib.

[0014] Optionally, the second air outlet is provided with a fixed bracket, which is arranged in the drainage cavity and connects the inner wall of the drainage cavity and the outer wall of the drainage device, and slots for air flow are provided between the fixed brackets.

[0015] The technical solution of the present invention can be used to set up an air outlet channel in the blowing device, and the curved air outlet channel can be used to better extend the flow path of the airflow in the blowing device, thereby reducing the wind noise during the flow of the airflow. In addition, by using a heating wire wrapped around a heat insulation sheet to form multiple parallel heating wire segments extending along the airflow direction, the heat radiated by the heating wire segments in the first air outlet channel can be used to heat the outlet airflow, which can effectively prevent the outlet airflow from colliding with the heating wire when flowing in the first air outlet channel to generate turbulence, reduce the loss of heat carried by the outlet airflow, and enable the heating mechanism to achieve stable heating of the outlet airflow without the need for high power consumption. At the same time, the heating wire segments parallel to the outlet airflow can be used for heating to reduce the force exerted by the outlet airflow on the heating mechanism, thereby effectively reducing the noise generated by the vibration of the heating mechanism and the first air outlet tube, achieving a better noise reduction effect of the blowing device, and improving the practicality and reliability of the blowing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0017] Figure 1 This is a structural diagram of an embodiment of the blowing device of the present utility model;

[0018] Figure 2 for Figure 1 An exploded view of an embodiment of a blowing device;

[0019] Figure 3 for Figure 1 A partial cross-sectional view of an embodiment of a blowing device;

[0020] Figure 4 for Figure 1 A flow diagram of the air flow in the blowing device;

[0021] Figure 5 for Figure 1 An exploded view of the structure of an embodiment of a first air outlet tube and a heating mechanism of a blowing device;

[0022] Figure 6 for Figure 1 A cross-sectional view of an embodiment of a first air outlet tube and a heating mechanism of a blowing device;

[0023] Figure 7 for Figure 1 A structural diagram of an embodiment of a heating mechanism of a blowing device.

[0024] Description of Figure Numbers:

[0025] Label name Label name 100 Blowing device 50 drainage device 10 First air outlet 60 Control circuit board 10a First air outlet channel 70 Heating mechanism 10b Ring air outlet 71 Thermal insulation sheet 11 First cylinder 711 Thermal insulation body 111 Limit connector 713 Support 113 The first rib 73 Heating wire 13 Second cylinder 90 Install the cylinder 131 Second rib 91 Air inlet cover 133 Limit slot 911 air inlet 15 card slot 913 Air inlet screen 30 Second air outlet 93 Air outlet cover 31 drainage cavity 931 air outlet 33 Second air outlet channel 95 Accommodation cavity

[0026] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0030] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or solutions that meet both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0031] It is understandable that in existing hair-blowing devices, the heating component can usually be fixed in the air outlet channel by using a heating wire bracket, and then a plurality of heating wire protrusions extending perpendicular to the air flow direction are provided on the heating wire bracket, so that when the air flow passes through the heating mechanism, it contacts the heating wire protrusions to achieve heating of the air flow. However, when the outlet air flow flows in the air outlet channel and carries away the heat released by the heating component, it will cause the outlet air flow to collide and interfere with the heating component, causing the outlet air flow to easily become turbulent in the air outlet channel, resulting in the loss of heat carried by the outlet air flow. When the hair-blowing device adopts a shorter air outlet cylinder structure, it is limited by the length of the air outlet channel, and the temperature of the outlet air flow blown out through the air outlet channel may be relatively low. Therefore, it is usually necessary to increase the working power of the heating component so that even if the outlet air flow is lost in the process of flowing through the air outlet channel, the temperature of the outlet air flow can still meet the temperature requirements required by the user.

[0032] Furthermore, the airflow collides with the heating element in the air outlet passage, which can easily cause the components in the blower to vibrate and generate a certain amount of noise. Using a relatively short air outlet cylinder can also result in a relatively high noise level when the airflow passes through. This can lead to a relatively high noise level during the operation of the blower, resulting in a poor user experience. To address the above issues, the present invention proposes a blower 100.

[0033] Reference Figures 1 to 7 In the embodiment of the present utility model, the blowing device 100 includes a first air outlet cylinder 10, a second air outlet cylinder 30, a flow guide device 50 and a heating mechanism 70. A first air outlet channel 10a is formed in the first air outlet cylinder 10. The longitudinal cross-section of the first air outlet channel 10a is annular. The first air outlet cylinder 10 is provided with an annular air inlet and an annular air outlet 10b connected to the first air outlet channel 10a; the second air outlet cylinder 30 is connected to the first air outlet cylinder 10 and covers the annular air inlet. A flow guide cavity 31 and a second air outlet channel 33 are formed in the second air outlet cylinder 30. The second air outlet channel 33 is located between the flow guide cavity 31 and the first air outlet channel 10a, and connects the flow guide cavity 31 and the first air outlet channel 10a. An air channel 10a is provided; a drainage device 50 is provided in the drainage cavity 31, and is used to drive the airflow to flow through the drainage cavity 31, the second air outlet channel 33 and the first air outlet channel 10a in sequence; a heating mechanism 70 is provided in the first air outlet channel 10a, and the heating mechanism 70 includes a heat insulation sheet 71 and a heating wire 73. The heat insulation sheet 71 is shaped like a hollow cylinder, and the heat insulation sheet 71 is defined to have a first surface and a second surface opposite to each other. The heating wire 73 is wound around the heat insulation sheet 71, and a plurality of heating wire 73 sections arranged side by side are formed on the first surface and the second surface respectively. The heating wire 73 sections extend along the airflow direction of the first air outlet channel 10a, and are spaced apart from the inner wall of the first air outlet channel 10a.

[0034] In the present application, the air guide device 50 can be a high-speed motor. By using the high-speed motor to drive the fan blades to rotate in the air guide chamber 31, the air around the blowing device 100 can be effectively driven into the air guide chamber 31 to form a high-speed airflow, thereby achieving a high-speed blowing effect of the blowing device 100. By using the second air outlet channel 33 to connect the first air outlet channel 10a and the air guide chamber 31, since the first air outlet channel 10a is an annular air duct structure, the channel structure of the second air outlet channel 33 can be a transition from a circular to an annular air duct structure. Furthermore, by connecting the first air outlet channel 10a and the second air outlet channel 33 to form an inverted "S"-shaped air duct, the inverted "S" shape is described based on the direction angle shown in the accompanying drawings. The curved air duct structure can effectively extend the flow path length of the airflow, which is conducive to better reducing the wind noise generated when the airflow flows through the air duct, achieving a better noise reduction effect. In addition, by arranging the air duct in the blowing device 100 in the above-mentioned structure, the airflow can enter the drainage cavity 31 and flow into the first air outlet channel 10a from the second air outlet channel 33. At the same time, it can enter the relatively narrow drainage cavity 31 and the second air outlet channel 33 into the relatively wide first air outlet channel 10a, thereby effectively utilizing the diffusion effect of the airflow to reduce the wind noise of the airflow, further improving the noise reduction effect of the blowing device 100, and improving the practicality and reliability of the blowing device 100.

[0035] A heating mechanism 70 is formed by winding a heating wire 73 on the thermal insulation sheet 71. The thermal insulation sheet 71 can be a sheet structure made of a material with certain thermal insulation properties such as mica sheet. The thermal insulation sheet 71 can be used to isolate the heat generated by the heating wire 73 and transfer it directly to the first air outlet 10. A longer heating wire 73 is spirally wound around the surface of the thermal insulation sheet 71, so that multiple heating wire 73 sections can be formed on the first and second surfaces of the thermal insulation sheet 71, which are laid side by side along the length direction of the thermal insulation sheet 71, and the heating wire 73 sections are extended along the airflow direction in the first air outlet channel 10a. When the heating mechanism 70 is installed in the first air outlet 10, the thermal insulation sheet 71 can be set along the airflow direction, so that the heating wire 73 sections on the thermal insulation sheet 71 can be set parallel to the airflow flowing in the first air outlet channel 10a. At the same time, since the thickness of the heat insulation sheet 71 is relatively small, when the heating mechanism 70 is set in the first air outlet channel 10a, a certain gap can be maintained between the heating wire 73 sections on the first and second surfaces of the heat insulation sheet 71 and the inner wall of the first air outlet channel 10a, so that the air flow can flow through the gap more stably and smoothly to be discharged, effectively avoiding the obstruction of the air flow by the heating mechanism 70, and thus preventing the turbulent flow of the air in the first air outlet channel 10a from colliding with the inner wall of the first air outlet channel 10a and the heating mechanism 70, thereby reducing the loss of heat carried by the air flow. The outlet air flow can maintain a high flow rate and heat flow out of the air outlet, so that the heating mechanism 70 does not need to use a higher working power to ensure the temperature of the outlet air flow, effectively reducing the power consumption of the blowing device 100; at the same time, the heating mechanism 70 set up in this way can effectively reduce the contact area between the air flow and the heating mechanism 70, which is conducive to better reducing the force of the outlet air flow on the heating mechanism 70, reducing the vibration of the heating mechanism 70 in the first air outlet tube 10, further improving the noise reduction effect of the blowing device 100, and effectively improving the practicality and reliability of the blowing device 100.

[0036] The heating mechanism 70 utilizes heating wires 73 extending in the direction of airflow and arranged on the first and second surfaces of the thermal insulation sheet 71. The heating wires 73 radiate heat toward the inner wall of the first air outlet channel 10a, so that when the airflow passes through the gap between the heating wires 73 and the inner wall of the first air outlet channel 10a, it carries heat energy and is discharged through the annular air outlet 10b, thereby achieving the hot air effect of the blowing device 100. At this time, by adjusting the overall size of the first air outlet tube 10, the channel width of the first air outlet channel 10a can be limited. This can prevent the gap between the heating wires 73 and the inner wall of the first air outlet channel 10a from being too large, which may cause the portion of the airflow away from the heating wires 73 to not receive sufficient heat, resulting in uneven heat distribution of the outlet airflow. Alternatively, the gap between the heating wires 73 and the inner wall of the first air outlet channel 10a can be too small, which may cause the heating mechanism 70 to affect the stable flow of the outlet airflow within the first air outlet channel 10a, thereby further improving the structural stability and reliability of the blowing device 100.

[0037] The technical solution of the present invention, by configuring the outlet channel within the blowing device 100, can utilize the curved outlet channel to better extend the flow path of the airflow within the blowing device 100 and reduce wind noise during the flow of the outlet airflow. Furthermore, by using the heating wire 73 to wrap around the heat insulation sheet 71 to form multiple parallel heating wire segments 73 extending along the airflow direction, the heat radiated from the heating wire segments 73 within the first outlet channel 10a can be used to heat the outlet airflow. This can effectively prevent the outlet airflow from colliding with the heating wire 73 when flowing within the first outlet channel 10a and generating turbulence, thereby reducing the loss of heat carried by the outlet airflow, and allowing the heating mechanism 70 to achieve stable heating of the outlet airflow without requiring high power consumption. At the same time, the heating wire segments 73 parallel to the outlet airflow can be used to heat the outlet airflow, reducing the force exerted by the outlet airflow on the heating mechanism 70, thereby effectively reducing the noise generated by the vibration of the heating mechanism 70 and the first air outlet tube 10, achieving a better noise reduction effect for the blowing device 100 and improving the practicality and reliability of the blowing device 100.

[0038] Reference Figure 2 and Figure 3 In one embodiment of the present invention, the blowing device 100 also includes a mounting cylinder 90, in which the first air outlet 10 and the second air outlet 30 are installed; the mounting cylinder 90 is provided with an air inlet cover 91, which is plugged into one end of the mounting cylinder 90 and is clamped to the second air outlet 30. The air inlet cover 91 is provided with an air inlet hole 911, which is connected to the drainage cavity 31.

[0039] In this embodiment, the hair-drying device 100 can utilize the mounting cylinder 90 to form an outer shell, so that the first air outlet tube 10 and the second air outlet tube 30 can be stably mounted and fixed in the mounting cylinder 90, thereby ensuring the stable operation of the hair-drying device 100. The mounting cylinder 90 can be equipped with a handheld handle, so that the hair-drying device 100 can be handheld by the user, thereby improving the convenience of operation of the hair-drying device 100. In this case, the handheld handle can be provided with a switch button for turning on or off the operation of the drainage device 50, as well as a temperature control button for adjusting the heating temperature of the heating mechanism 70, etc., to ensure the stable operation of the hair-drying device 100.

[0040] By inserting and setting the air inlet cover 91 at one end of the mounting cylinder 90, the air inlet cover 91 can be used to guide the airflow driven by the drainage device 50, so that the airflow can be stably converged through the air inlet hole 911 and flow into the drainage cavity 31, thereby achieving the convergent air intake effect of the blowing device 100, which is conducive to better ensuring the flow rate and flow rate of the incoming air flow, further improving the high-speed blowing effect of the blowing device 100, and improving the practicality and reliability of the blowing device 100. Among them, the air inlet cover 91 can be fixedly inserted into the mounting housing by bolts or buckles, and at the same time, a card slot 15 or a buckle corresponding to the air inlet cover 91 can be provided on the side of the second air inlet cylinder facing the air inlet cover 91 to ensure the stable installation of the air inlet cover 91 on the mounting housing. In addition, a sealing gasket can be provided at the clamping position between the air inlet cover 91 and the second air inlet tube, which is conducive to using the sealing gasket to better seal the gap between the air inlet cover 91 and the second air inlet tube, prevent the leakage of the intake air flow in the installation cylinder 90, and ensure the converging air intake effect of the blowing device 100.

[0041] Reference Figure 3 In one embodiment of the present invention, the second air outlet duct 30, the mounting cylinder 90 and the air inlet cover 91 enclose a receiving cavity 95, and the blowing device 100 further includes a control circuit board 60, which is disposed in the receiving cavity 95 and is sleeved on the outer periphery of the second air outlet duct 30.

[0042] In this embodiment, by using the air inlet cover 91 to be inserted into one end of the mounting cylinder 90, and using the air inlet cover 91 to form the air inlet hole 911, the size of the second air outlet cylinder 30 can be set smaller than the size of the first air outlet cylinder 10, so that the inner cavity of the mounting cylinder 90 can form an accommodating cavity 95 between the second air outlet cylinder 30, the inner wall of the mounting cylinder 90 and the air inlet cover 91, thereby forming a cavity structure with a certain degree of sealing in the mounting cylinder 90. At this time, by setting the control circuit board 60 of the blowing device 100 in the accommodating cavity 95 and sleeved on the outer periphery of the second air outlet cylinder 30, the intake air flow of the blowing device 100 can be well avoided from entering the accommodating cavity 95, preventing the control circuit board 60 from being affected by the intake air flow, ensuring the overall structural stability of the blowing device 100, and further improving the practicality and reliability of the blowing device 100.

[0043] Reference Figure 3 In one embodiment of the present invention, the inner diameter of the air inlet hole 911 gradually decreases along the air inlet direction. Alternatively, the air inlet cover 91 is provided with an air inlet screen 913, which covers the air inlet hole 911. Alternatively, the mounting cylinder 90 is further provided with an air outlet cover 93, which is plugged into the other end of the mounting cylinder 90 and engages with the first air outlet cylinder 10. The air outlet cover 93 is provided with an air outlet hole 931, which communicates with the annular air outlet 10b.

[0044] In this embodiment, by gradually reducing the inner diameter of the air inlet hole 911 along the air inlet direction, the overall structure of the air inlet hole 911 can be set in a conical shape, which is beneficial to utilizing the conical air inlet hole 911 to play a certain role in guiding and draining air, so that the blowing device 100 can guide a larger area of ​​air into the drainage chamber 31, ensuring a large amount of air intake of the blowing device 100 and the speed-up of the airflow by the drainage device 50, further improving the high-speed blowing effect of the blowing device 100, and improving the practicality and reliability of the blowing device 100.

[0045] In addition, the blowing device 100 can be provided with an air inlet screen 913 at the air outlet 931 of the air inlet cover 91. The air inlet screen 913 can be connected to the end surface of the air inlet cover 91 facing away from the mounting cylinder 90, and the air inlet screen 913 can be provided to cover the air inlet 911. This is beneficial for utilizing the air inlet screen 913 to reduce a certain amount of airflow noise and filter out debris carried by a portion of the airflow. The air inlet screen 913 can be formed by connecting a noise reduction cotton layer and a filter layer. When the airflow passes through the air inlet screen 913 and enters the drainage chamber 31, the noise reduction cotton layer and the filter layer can eliminate the wind noise and filter out foreign matter in the airflow. This allows the blowing device 100 to drive a relatively pure airflow into the first air outlet 10 and the second air outlet 30, thereby ensuring the stable operation of the drainage device 50 and the heating mechanism 70, and further improving the noise reduction effect and structural stability of the blowing device 100.

[0046] Secondly, at the other end of the mounting cylinder 90, the blowing device 100 may also be provided with an air outlet cover 93, which is plugged and fixed to the end of the mounting cylinder 90 and is fixedly engaged with the first air outlet cylinder 10. In this way, the air outlet cover 93, which has a certain convergent air outlet effect, can be used to discharge the airflow flowing through the annular air outlet, further improving the convergent air outlet effect of the blowing device 100. At the same time, under the action of the air outlet cover 93, the backflow of the outlet airflow into the mounting cylinder 90 can be effectively prevented, thereby preventing the outlet airflow from affecting the components in the blowing device 100, further improving the structural stability and reliability of the blowing device 100.

[0047] In one embodiment of the present invention, there is one heating mechanism 70. Alternatively, there are at least two heating mechanisms 70, and the at least two heating mechanisms 70 are sequentially and spaced apart and sleeved in the first air outlet channel 10a.

[0048] In this embodiment, the blowing device 100 can be configured with only one heating mechanism 70, so that the size of the first air outlet channel 10a can be set corresponding to the spacing setting requirements of the heating mechanism 70, thereby realizing a miniaturized design of the blowing device 100. At this time, the power of the heating mechanism 70 can be adjusted according to the user's usage requirements, so that the blowing device 100 can blow out hot air that meets the user's usage needs, further improving the practicality and reliability of the blowing device 100.

[0049] In addition, the blowing device 100 can also be configured with at least two heating mechanisms 70, so that a larger number of heating mechanisms 70 can be used to better increase the heat of the outlet air flow; or a larger number of heating mechanisms 70 can be used to ensure the setting of a first air outlet channel 10a with a larger volume, so as to better achieve large air volume outlet of the blowing device 100. Among them, the blowing device 100 can select an appropriate number of heating mechanisms 70 according to the size setting requirements of the first air outlet channel 10a and the spacing requirements between the first air outlet channel 10a and the heating mechanism 70. When it is necessary to configure at least two heating mechanisms 70 in the blowing device 100, at least two heating mechanisms 70 can be arranged in sequence with a certain interval, and when multiple heating mechanisms 70 are installed in the first air outlet channel 10a, the heating mechanism 70 close to the inner wall of the channel of the first air outlet channel 10a maintains a certain gap with the inner wall of the channel of the first air outlet channel 10a, so that the outlet air flow can smoothly flow through the gap between the heating mechanism 70 and the inner wall of the channel of the first air outlet channel 10a and the gap between the heating mechanisms 70, thereby ensuring the stable heating of the air flow in the blowing device 100 and achieving a stable and reliable hot air blowing effect of the blowing device 100.

[0050] Therefore, by arranging multiple heating mechanisms 70 at intervals within the first air outlet channel 10a, the multiple heating mechanisms 70 can be utilized to better increase the heat carried by the outlet airflow, so that the hot air blown by the hair dryer 100 better meets the user's usage needs. Alternatively, when a larger first air outlet channel 10a is required in the first air outlet tube 10 to meet the demand for high air volume, the multiple heating mechanisms 70 arranged at intervals can better release heat into the entire first air outlet channel 10a, effectively reducing the heating dead zone within the first air outlet channel 10a, ensuring that the outlet airflow can be fully heated, and thus better ensuring the uniform hot air discharge effect of the hair dryer 100, further improving the practicality and reliability of the hair dryer 100.

[0051] Furthermore, when at least two heating mechanisms 70 are configured in the blowing device 100, a certain spacing requirement needs to be maintained between adjacent heating mechanisms 70, which is beneficial to avoid mutual interference between the heating mechanisms 70, and at the same time ensures that the heating mechanisms 70 can better release heat in the entire first air outlet channel 10a, further improving the practicality and reliability of the blowing device 100. Specifically, the spacing H between two adjacent heating mechanisms 70 can be limited to between 2mm and 10mm, wherein by making H≥2mm, for example, H=2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, etc., within this range, it can be ensured that there can be a certain gap between adjacent heating mechanisms 70, which is conducive to better avoiding the heating wire 73 sections on the two adjacent insulation sheets 71 from contacting each other and causing a certain probability of overheating of the heating mechanism 70, thereby ensuring the stable operation of the blowing device 100, and at the same time allowing the outlet air flow to flow more stably and reliably through the gap between the two adjacent heating mechanisms 70, effectively preventing the heating mechanism 70 from obstructing the outlet air flow and causing a certain probability of heat loss of the outlet air flow, thereby ensuring full utilization of the thermal energy of the blowing device 100. At the same time, by making H≤10mm, for example, H=5mm, 6mm, 7mm, 8mm, 9mm, etc., within this range, the distance between the two adjacent heating mechanisms 70 will not be too large, so that the two adjacent heating mechanisms 70 can fully radiate heat in the gap between them, effectively avoiding the heating dead zone in the first air outlet channel 10a, ensuring that the air flow is evenly heated in the first air outlet channel 10a, improving the hot air outlet effect of the blowing device 100, and further improving the practicality and reliability of the blowing device 100.

[0052] Reference Figure 5 and Figure 7 In one embodiment of the present invention, the heat insulation sheet 71 includes a heat insulation body 711 and a support member 713. The heating wire 73 is wound around the heat insulation body 711. The heat insulation body 711 has two ends facing the annular air inlet and the annular air outlet 10b respectively; the support member 713 is connected to the two ends of the heat insulation body 711 and abuts against the inner wall of the first air outlet channel 10a.

[0053] In this embodiment, the thermal insulation sheet 71 may include a thermal insulation body 711 and a support member 713. The thermal insulation body 711 may be a sheet-like structure with a smaller thickness so that the heating wire 73 can be wound around the thermal insulation body 711. At this time, the upper and lower surfaces of the thermal insulation body 711 can be formed as the first surface and the second surface of the thermal insulation sheet 71, so that the heating wire 73 can be wound around the thermal insulation body 711 to form side-by-side heating wire 73 sections on the surface of the thermal insulation body 711, thereby ensuring that the heating mechanism 70 stably heats the outlet airflow in the first air outlet channel 10a. By connecting the support members 713 at both ends of the heat insulation body 711, the support members 713 can be a rod or a sheet structure set corresponding to the width of the first air outlet channel 10a, so that the support members 713 can be fixed to the end of the heat insulation body 711 by snapping or bonding, and then when the heating mechanism 70 is installed in the first air outlet channel 10a, the support members 713 can be used to abut against the inner wall of the first air outlet channel 10a, so that the heat insulation body 711 can be suspended in the first air outlet channel 10a, The obstructed airflow can stably pass through the gap between the heat-insulating main body 711 and the inner wall of the first air outlet channel 10a, thereby better ensuring the stable hot air outlet of the blowing device 100; at the same time, under the support of the support member 713, it can better avoid the possibility of interference and collision between the heat-insulating main body 711 and the inner wall of the first air outlet channel 10a when the blowing device 100 is subjected to external force, thereby preventing the heat generated by the heating wire 73 from being directly transferred to the first air outlet tube 10, thereby further improving the structural stability and reliability of the blowing device 100.

[0054] Reference Figure 5 In one embodiment of the present invention, a limiting slot 133 is provided on the inner wall of the first air outlet channel 10a, and the support member 713 is engaged with the limiting slot 133. And / or, a heat insulation layer is provided on the inner wall of the first air outlet channel 10a.

[0055] In this embodiment, the first air outlet tube 10 can also be provided with a limiting card slot 133 on the inner wall of the first air outlet channel 10a. The slot width of the limiting card slot 133 can be set to correspond to the width dimension of the support member 713 of the heat insulation plate 71, so that when the heating mechanism 70 is assembled into the first air outlet tube 10, the support member 713 can be clamped into the limiting card slot 133, and fixed in the first air outlet channel 10a as the limiting card slot 133 slides. Then, the heating mechanism 70 can be positioned and installed under the action of the limiting card slot 133, so that the heating mechanism 70 can be firmly set in the first air outlet channel 10a, preventing the heating mechanism 70 from being offset by external force during operation, thereby further improving the overall structural stability and reliability of the blowing device 100.

[0056] In addition, the first air outlet tube 10 can be provided with an insulation layer on the inner wall of the first air outlet channel 10a. The insulation layer can be made of materials with good insulation properties such as insulation silicone and asbestos. Under the action of the insulation layer, the heat generated by the heating mechanism 70 can be effectively concentrated and diffused in the first air outlet channel 10a, which is beneficial to better avoid the heat generated by the heating mechanism 70 from being transferred to the first air outlet tube 10, causing the first air outlet tube 10 to overheat and affect the user's experience. At the same time, it can reduce heat loss, so that the heating mechanism 70 can apply heat to the outlet airflow more fully, which is beneficial to better reduce the power consumption of the heating mechanism 70 and further improve the practicality and reliability of the blowing device 100.

[0057] Reference Figure 6 and Figure 7 In one embodiment of the present invention, the first air outlet channel 10a is defined as having a first inner wall and a second inner wall facing each other. The first inner wall faces the first surface of the heat insulation sheet 71, and the second inner wall faces the second surface of the heat insulation sheet 71. The distance between the first inner wall and the heating wire 73 segment on the first surface is defined as W1, and the distance between the second inner wall and the heating wire 73 segment on the second surface is defined as W2, where 0.5≤W2 / W1≤1.

[0058] In this embodiment, a first air outlet channel 10a is formed by opening an annular through hole in the first air outlet tube 10, so that a first inner wall and a second inner wall relative to each other are formed in the first air outlet channel 10a. When the heating mechanism 70 is installed in the first air outlet channel 10a, the heat insulation sheet 71 can be arranged between the first inner wall and the second inner wall, so that the air flow can stably flow through the gap between the first inner wall and the first surface and the gap between the second inner wall and the second surface to discharge air.

[0059] When the guide device 50 drives air into the annular air inlet, the airflow is subjected to the cyclonic effect of the guide device 50, causing the airflow to have a certain outward diffusion force. This causes the airflow to flow toward the first inner wall after entering the first air outlet channel 10a, thereby facilitating a greater amount of airflow between the first inner wall and the first surface than between the second inner wall and the second surface. By limiting the ratio of the spacing W2 between the heating wire segments 73 on the second inner wall and the second surface to the spacing W1 between the heating wire segments 73 on the first inner wall and the first surface to between 0.5 and 1, W1 can be set to be greater than W2. This facilitates providing a larger flow space for the larger airflow flowing between the first surface and the first inner wall for outlet. Furthermore, within the larger flow space, the airflow can be better exposed to the heat energy radiated by the heating wire segments 73 on the first surface, thereby preventing the larger airflow from flowing too fast in a narrow space and reducing the heat carried by the airflow, thereby ensuring stable hot air outlet from the blowing device 100. At the same time, by making the circulation space between the second surface and the second inner wall smaller, it is possible to facilitate smoother flow of air with a smaller flow rate through the circulation space between the second surface and the second inner wall, avoiding the possibility of flow velocity attenuation caused by the smaller flow rate flowing in a larger circulation space, further improving the air outlet stability and reliability of the blowing device 100, and achieving a better air outlet effect of the blowing device 100. The airflow flowing between the second surface and the second inner wall can flow close to the second surface due to the airflow diffusion effect, so that the airflow can be fully heated by the heating wire 73 section on the second surface, further ensuring that the outlet airflow is fully heated in the first air outlet channel 10a, achieving uniform heating of the hot air flow, and further improving the structural stability and reliability of the first air outlet tube 10.

[0060] Furthermore, the spacing W1 between the heating wire 73 segment on the first surface and the first inner wall can be limited to between 0.5mm and 6mm, so that the first air outlet 10 can be configured with a first air outlet channel 10a of a relatively suitable volume for smooth air flow and forming a hot air flow that is heated more evenly. Among them, by making W1 ≥ 0.5mm, for example, W1 = 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, etc., within this range, the spacing between the first air outlet channel 10a on the first surface and the first inner wall is not too small, which is beneficial to avoid the first air outlet 10 being subjected to external forces during operation, which may cause the heating wire 73 segment on the first surface to contact the first inner wall and transfer heat to the first air outlet 10, and is beneficial to allow the air flow to flow more smoothly through the gap between the first surface and the first inner wall, so that the blowing device 100 has a higher air flow rate and flow rate, ensuring the stable operation of the blowing device 100. At the same time, by making W1 ≤ 6mm, for example, W1 = 3mm, 4mm, 5mm, 6mm, etc., within this range, the distance between the first surface of the first air outlet channel 10a and the first inner wall is not too large, which helps to avoid the heat radiated by the heating wire 73 section on the first surface to the area near the first inner wall being low, which may cause the airflow flowing close to the first inner wall to not receive heat energy well, thereby ensuring that the heating mechanism 70 stably and fully heats the outlet airflow. Therefore, by making W1 meet the condition of 0.5mm ≤ W1 ≤ 6mm, the overall structural stability of the heating mechanism 70 and the first air outlet duct 10 can be better improved, while ensuring that the outlet airflow can flow more smoothly through the gap between the first surface and the first inner wall, and ensuring that the heating mechanism 70 stably heats the outlet airflow flowing through the gap, further improving the practicality and reliability of the first air outlet duct 10.

[0061] Similarly, the spacing W2 between the heating wire 73 section on the second surface and the second inner wall can be limited to between 0.5mm and 6mm, so that the first air outlet 10 can be configured with a first air outlet channel 10a of relatively suitable volume for smooth air flow and forming a hot air flow that is heated more evenly. By setting W2 ≥ 0.5mm, for example, W2 = 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, etc., within this range, the spacing between the first air outlet channel 10a and the second inner wall is not too small, which is beneficial to avoid the first air outlet 10 being subjected to external forces during operation, which may cause the heating wire 73 section on the second surface to contact the second inner wall and transfer heat to the first air outlet 10. It is also beneficial to allow the air flow to flow more smoothly through the gap between the second surface and the second inner wall, so that the blowing device 100 has a higher air flow rate and flow rate, ensuring the stable operation of the blowing device 100. At the same time, by making W2 ≤ 6mm, for example, W2 = 3mm, 4mm, 5mm, 6mm, etc., within this range, the distance between the second surface of the first air outlet channel 10a and the second inner wall is not too large, which helps to avoid the heat radiated by the heating wire 73 section on the second surface to the area near the second inner wall being low, which may cause the airflow flowing close to the second inner wall to not receive heat energy well, thereby ensuring that the heating mechanism 70 stably and fully heats the outlet airflow. Therefore, by making W2 meet the condition of 0.5mm ≤ W1 ≤ 6mm, the overall structural stability of the heating mechanism 70 and the first air outlet duct 10 can be better improved, while ensuring that the outlet airflow can flow more smoothly through the gap between the second surface and the second inner wall, and ensuring that the heating mechanism 70 stably heats the outlet airflow flowing through the gap, further improving the practicality and reliability of the first air outlet duct 10.

[0062] In addition, the heating wire 73 is wound around the heat insulating sheet 71 and forms a plurality of heating wire 73 segments laid side by side on the first surface and the second surface of the heat insulating sheet 71. The gap between the heating wire 73 segments on the first surface or the second surface can be regulated during the winding process to ensure that the heating mechanism 70 can heat the airflow in the first air outlet channel 10a more stably and prevent mutual interference between the heating wire 73 segments. Among them, the spacing L between any two adjacent heating wire 73 segments can be limited to a range greater than or equal to 0.5mm, for example, L can be made 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc. Within this range, a certain spacing can be maintained between any two adjacent heating wire 73 segments, which is conducive to better avoiding mutual interference and collision between adjacent heating wire 73 segments, preventing local overheating of the heating mechanism 70 and a certain probability of overload damage to the heating mechanism 70, ensuring the stable operation of the first air outlet 10, and further improving the overall structural stability and reliability of the first air outlet 10.

[0063] Reference Figure 5 In one embodiment of the present utility model, the first air outlet tube 10 includes a first cylinder 11 and a second cylinder 13. A limiting connector 111 is provided in the first cylinder 11, and a plurality of first ribs 113 are provided on the outer periphery of the limiting connector 111. One end of the first rib 113 facing away from the limiting connector 111 is connected to the inner wall of the first cylinder 11; the second cylinder 13 is detachably arranged in the first cylinder 11 and is clamped with the limiting connector 111. A plurality of second ribs 131 are provided on the outer wall of the second cylinder 13. One end of the second rib 131 facing away from the second cylinder 13 abuts against the inner wall of the first cylinder 11. The outer wall of the second cylinder 13 and the inner wall of the first cylinder 11 enclose a first air outlet channel 10a. The limiting connecting piece 111 and the first rib 113 are arranged at the annular air outlet 10b, the second rib 131 is arranged at the annular air inlet, and the opposite side walls of the first rib 113 and the second rib 131 are respectively provided with a card groove 15, and the two ends of the heat insulation plate 71 are respectively clamped in the card groove 15 of the first rib 113 and the card groove 15 of the second rib 131.

[0064] In this embodiment, the first air outlet cylinder 10 can be formed by combining a first cylinder 11 and a second cylinder 13 that can be detachably arranged, wherein the outer diameter of the second cylinder 13 is smaller than the inner diameter of the first cylinder 11, so that when the second cylinder 13 is coaxially installed with the first cylinder 11 or centrifugally installed, a first air outlet channel 10a with a certain space can be formed between the inner wall of the first cylinder 11 and the outer wall of the second cylinder 13. At this time, one end of the first cylinder 11 and one end of the second cylinder 13 can be spaced apart to form an annular air inlet connected to the first air outlet channel 10a, and the other end of the first cylinder 11 and the other end of the second cylinder 13 can be spaced apart to form an annular air outlet 10b connected to the first air outlet channel 10a.

[0065] By arranging a limiting connector 111 in the first cylinder 11, the limiting connector 111 can be a sleeve that is plugged and fixed with the second cylinder 13, and a first rib 113 can be arranged on the outer periphery of the limiting connector 111. The first rib 113 is used to connect the outer wall of the limiting connector 111 and the inner wall of the first cylinder 11. Then, when the second cylinder 13 is inserted into the first cylinder 11, the second cylinder 13 can be plugged and fixed on the limiting connector 111, thereby achieving relatively stable assembly of the first cylinder 11 and the second cylinder 13, preventing the second cylinder 13 from shifting in the first cylinder 11, ensuring the stable air outlet effect of the first air outlet 10, and further improving the structural stability and reliability of the first air outlet 10. In addition, the outer periphery of the second cylinder 13 can be provided with a second rib 131, and the size of the second rib 131 can be set to correspond to the distance between the inner wall of the first cylinder 11 and the outer wall of the second cylinder 13, so that the second cylinder 13 can use the second rib 131 to abut against the inner wall of the first cylinder 11, thereby realizing relatively stable assembly of the first cylinder 11 and the second cylinder 13, preventing the second cylinder 13 from shifting in the first cylinder 11, ensuring the stable air outlet effect of the first air outlet 10, and further improving the structural stability and reliability of the first air outlet 10.

[0066] The first air outlet 10 can be provided with a limiting connector 111 and a first rib 113 at the annular air outlet 10b, and with the second rib 131 at the annular air inlet, to better prevent the first rib 113 and the second rib 131 from occupying the space of the first air outlet channel 10a, thereby ensuring that the airflow can flow smoothly and be heated within the first air outlet channel 10a, reducing collisions and heat losses of the airflow within the first air outlet channel 10a, and further improving the structural stability and reliability of the first air outlet 10. In addition, since the first rib 113 and the second rib 131 are provided to separate the first air outlet channel 10a, when the heating mechanism 70 is installed in the first air outlet channel 10a, the heat insulation sheet 71 can be clipped and fixed to the first rib 113 and the second rib 131, ensuring the relative fixed assembly of the heating mechanism 70 and the first air outlet 10, preventing the heating mechanism 70 from deviating from the first air outlet channel 10a, ensuring the stable operation of the first air outlet 10, and further improving the overall structural stability and reliability of the first air outlet 10. At this time, a slot 15 can be set on the side wall of the first rib 113 facing the second rib 131, and a slot 15 can be set on the side wall of the second rib 131 facing the first rib 113. Then, the slot 15 on the first rib 113 and the slot 15 on the second rib 131 can be used to respectively clamp the opposite ends of the heat insulation plate 71 to achieve a stable connection between the heating mechanism 70 and the first air outlet 10. At the same time, under the supporting and fixing action of the first rib 113 and the second rib 131 on the heat insulation plate 71, the heating wire 73 section formed on the heat insulation plate 71 can maintain a certain gap with the inner wall of the first cylinder 11 and the outer wall of the second cylinder 13, thereby ensuring that the outlet air flow can stably flow through the first air outlet channel 10a and carry the heat released by the heating mechanism 70, thereby further improving the overall structural stability and reliability of the first air outlet 10.

[0067] Therefore, by utilizing the mutually detachable first cylinder 11 and the second cylinder 13 to form the first air outlet 10, and arranging a corresponding supporting connection structure between the first cylinder 11 and the second cylinder 13 to ensure the relative stability of the first cylinder 11 and the second cylinder 13 after installation, and realizing the fixation of the first air outlet 10 to the heat insulation plate 71, the overall structural stability of the first air outlet 10 can be better guaranteed. At the same time, during the production process and the maintenance process, the mutual disassembly of the first cylinder 11 and the second cylinder 13 can be utilized to more conveniently realize the disassembly and replacement of the heating mechanism 70 in the first air outlet channel 10a, thereby further improving the disassembly convenience and practicality of the first air outlet 10.

[0068] In one embodiment of the present invention, the second air outlet 30 is provided with a fixed bracket, which is arranged in the drainage cavity 31 and connects the inner wall of the drainage cavity 31 and the outer wall of the drainage device 50. Slots for air flow are provided between the fixed brackets.

[0069] In this embodiment, a fixing bracket capable of securing the drainage device 50 is provided between the inner wall of the drainage chamber 31 and the outer wall of the drainage device 50. The fixing bracket includes a fixing shell that fits over the outer wall of the drainage device 50. A fixing ring surrounding the fixing shell is provided on the inner wall of the drainage chamber 31. A plurality of fixing rods are sequentially connected between the fixing ring and the fixing shell. The fixing rods have a plurality of slots connected end-to-end to allow air to pass through. A shock-absorbing rubber pad is provided between the fixing ring and the inner wall of the drainage chamber 31 to reduce vibration caused by the drainage device 50 during operation and to reduce noise generated by the vibration of the drainage device 50. By using the fixing bracket to secure the drainage device 50 within the drainage chamber 31, deviation of the drainage device 50 during operation can be effectively avoided, achieving a stable blowing effect for the blowing device 100 and further improving the overall structural stability and reliability of the blowing device 100.

[0070] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A blowing device, characterized in that: include: A first air outlet cylinder, wherein a first air outlet channel is formed in the first air outlet cylinder, the longitudinal cross-section of the first air outlet channel is annular, and the first air outlet cylinder is provided with an annular air inlet and an annular air outlet connected to the first air outlet channel; A second air outlet cylinder, the second air outlet cylinder is connected to the first air outlet cylinder and covers the annular air inlet, a drainage cavity and a second air outlet channel are formed in the second air outlet cylinder, the second air outlet channel is located between the drainage cavity and the first air outlet channel, and connects the drainage cavity and the first air outlet channel; A drainage device, the drainage device is arranged in the drainage cavity and is used to drive the airflow to flow through the drainage cavity, the second air outlet channel and the first air outlet channel in sequence; A heating mechanism is arranged in the first air outlet channel, and the heating mechanism includes a heat insulating sheet and a heating wire. The heat insulating sheet is in the shape of a hollow cylinder, and the heat insulating sheet is defined to have a first surface and a second surface opposite to each other. The heating wire is wound around the heat insulating sheet, and a plurality of heating wire segments arranged side by side are formed on the first surface and the second surface respectively. The heating wire segments extend along the airflow direction of the first air outlet channel, and are spaced apart from the inner wall of the first air outlet channel.

2. The blowing device according to claim 1, characterized in that: The blowing device further comprises a mounting cylinder, wherein the first air outlet cylinder and the second air outlet cylinder are mounted in the mounting cylinder; The installation cylinder is provided with an air inlet cover, which is plugged into one end of the installation cylinder and clamped with the second air outlet cylinder. The air inlet cover is provided with an air inlet hole, which is connected to the drainage cavity.

3. The blowing device according to claim 2, characterized in that: The second air outlet cylinder, the mounting cylinder and the air inlet cover together form a containing cavity. The blowing device further comprises a control circuit board, which is arranged in the containing cavity and sleeved on the outer periphery of the second air outlet cylinder.

4. The blowing device according to claim 2, characterized in that: The inner diameter of the air inlet hole is gradually reduced along the air inlet direction; And / or, the air inlet cover is provided with an air inlet screen, and the air inlet screen covers the air inlet hole; And / or, the installation cylinder is also provided with an air outlet cover, the air outlet cover is plugged into the other end of the installation cylinder and clamped with the first air outlet tube, the air outlet cover is provided with an air outlet hole, and the air outlet hole is connected to the annular air outlet.

5. The blowing device according to any one of claims 1 to 4, characterized in that: The number of the heating mechanism is one; Alternatively, the number of the heating mechanisms is at least two, and at least two of the heating mechanisms are sequentially and spaced apart from each other in the first air outlet channel.

6. The blowing device according to any one of claims 1 to 4, characterized in that: The thermal insulation sheet comprises: A heat-insulating body, the heating wire is wound around the heat-insulating body, and the heat-insulating body has two ends facing the annular air inlet and the annular air outlet respectively; A support member is connected to two ends of the heat insulation body and abuts against an inner wall of the first air outlet channel.

7. The blowing device according to claim 6, characterized in that: A limit slot is provided on the inner wall of the first air outlet channel, and the support member is clamped in the limit slot; And / or, a heat insulation layer is provided on the inner wall of the first air outlet channel.

8. The blowing device according to any one of claims 1 to 4, characterized in that: The first air outlet channel is defined to have a first inner wall and a second inner wall opposite to each other, the first inner wall is arranged toward the first surface of the heat insulation sheet, and the second inner wall is arranged toward the second surface of the heat insulation sheet; The distance between the first inner wall and the heating wire segment on the first surface is defined as W1, and the distance between the second inner wall and the heating wire segment on the second surface is defined as W2, and 0.5≤W2 / W1≤1.

9. The blowing device according to any one of claims 1 to 4, characterized in that: The first air outlet comprises: A first cylinder, wherein a limiting connection piece is disposed in the first cylinder, a plurality of first ribs are disposed on the outer periphery of the limiting connection piece, and an end of the first rib facing away from the limiting connection piece is connected to the inner wall of the first cylinder; a second cylinder, the second cylinder being detachably disposed in the first cylinder and being clamped with the position-limiting connector, a plurality of second ribs being disposed on an outer wall of the second cylinder, an end of the second rib facing away from the second cylinder being in contact with an inner wall of the first cylinder, and the outer wall of the second cylinder and the inner wall of the first cylinder being enclosed to form the first air outlet channel; The limiting connecting piece and the first rib are arranged at the annular air outlet, the second rib is arranged at the annular air inlet, the opposite side walls of the first rib and the second rib are respectively provided with slots, and the two ends of the heat insulation sheet are respectively clamped in the slots of the first rib and the slots of the second rib.

10. The blowing device according to any one of claims 1 to 4, characterized in that: The second air outlet tube is provided with a fixed bracket, which is arranged in the drainage cavity and connects the inner wall of the drainage cavity and the outer wall of the drainage device. Slots for air flow are provided between the fixed brackets.

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