Double-layered bidirectional wind wheel, fan shell, fan and bath heater

Abstract

The application discloses a double-layer bidirectional wind wheel, which comprises a body and a plurality of blades arranged on the body, wherein each blade is formed as an arc-shaped wind collecting surface, and each blade comprises a first blade and a second blade arranged along the height direction of the wind wheel, and the wind collecting surface of the first blade is arranged reversely to the wind collecting surface of the second blade. The application further discloses a double-layer bidirectional fan shell and a double-layer bidirectional fan comprising the wind wheel and the fan shell. The double-layer bidirectional wind wheel, the fan shell and the fan of the application can realize bidirectional air outlet, and the air outlet is uniform and pressure balanced. Meanwhile, the wind energy loss is small, and the efficiency is high.

Description

Technical Field

[0001] This invention relates to a fan, and more particularly to a double-layer bidirectional impeller, a fan housing, and a fan and a bathroom heater including the impeller and the fan housing, belonging to the field of gas transportation and utilization technology. Background Technology

[0002] A blower is a device for compressing and transporting gas, converting rotational mechanical energy into gas pressure energy and kinetic energy, and then transporting the gas outwards. Based on the direction of airflow after entering the impeller, blowers can be classified into centrifugal blowers, axial flow blowers, and mixed flow blowers. Centrifugal blowers, in particular, refer to blowers where the airflow enters the impeller axially and then primarily flows radially. One advantage of centrifugal blowers is their ability to generate air pressure.

[0003] The volute of a centrifugal fan collects gas and converts some of its kinetic energy into pressure energy, building up air pressure and enabling the fan to deliver air at a certain velocity. Therefore, the volute of a traditional centrifugal fan can generally be divided into a pressure-building zone and a pressure-releasing zone. The design of the fan casing needs to consider the angle between the impeller's outlet direction and the casing wall. Ideally, this angle is 0 degrees, resulting in no collision between the gas exiting the impeller and the casing, no loss of pressure energy, and no noise. However, in practical applications, to achieve certain practical purposes, such as meeting the requirements for the fan's outlet direction, the fan casing guides the gas, leading to some collision and energy loss between the gas and the casing.

[0004] On the other hand, with the improvement of living standards, people's requirements for various air conditioning devices containing fans are also gradually increasing, with annular uniform velocity airflow being one such requirement. While theoretically, setting the air outlet of such devices to an annular shape would achieve annular airflow, the airflow direction is fixed because the gas exiting the fan passes through the casing for pressure build-up and release. Simply setting the outlet to an annular shape to achieve so-called "annular airflow" results in significant pressure differences at different locations on the outlet; the air pressure is high near the fan's outlet direction and low further away. Therefore, true annular, uniform pressure airflow is not achieved. Thus, the fan casing needs to be redesigned.

[0005] Furthermore, there are increasingly higher requirements for the compact structure and diverse functions of fans. Due to height limitations of the installation section, fans are required to have the smallest possible thickness; in terms of functionality, after fulfilling the indoor air circulation function, people often require the circulation of indoor and outdoor air. Summary of the Invention

[0006] To solve any of the above-mentioned technical problems, the present invention first provides a double-layer bidirectional impeller that can provide wind-gathering surfaces in different directions, thereby providing airflow in different directions when rotating in different directions.

[0007] In another aspect, the present invention provides a double-layer bidirectional fan housing that effectively guides and distributes the air outlet in the impeller, making it evenly and pressure-equally distributed, and minimizing wind pressure loss.

[0008] In another aspect, the present invention provides a double-layer bidirectional fan including the impeller and the fan housing, and a bathroom heater and air purification device including the double-layer bidirectional fan.

[0009] Therefore, the present invention adopts the following technical solution:

[0010] A double-layer bidirectional wind turbine includes a body and a plurality of blades disposed on the body, each blade forming an arc-shaped wind-gathering surface, characterized in that: each blade includes a first blade and a second blade disposed along the height direction of the wind turbine, the wind-gathering surfaces of the first blade and the second blade being disposed in opposite directions.

[0011] By setting first and second blades with opposite wind-gathering surfaces in the height direction of the wind turbine, a double-layer bidirectional wind turbine is formed. When the wind turbine rotates in the forward and reverse directions, it can generate airflow in different directions. Combined with the design of the casing, two sets of gas circulation paths can be formed with one set of wind turbine and motor structure configuration to meet the needs of indoor and indoor / outdoor gas circulation. Moreover, when one layer of blades (first or second blade) is working, the other layer of blades will not work in the opposite direction to consume energy, and the wind turbine has a higher energy conversion efficiency.

[0012] Furthermore, the bottom edge of the first blade and the top edge of the second blade are located on the same horizontal line, and the height ratio of the first blade to the second blade is 1:0.5 to 2.

[0013] When one layer of blades (the first or second blade) is working, the other layer of blades will not work in the opposite direction and consume energy, resulting in higher energy conversion efficiency for the wind turbine. At the same time, by setting the height ratio of the first and second blades, the amount of work done and the amount of air output in different directions can be adjusted, which is convenient and efficient.

[0014] In another aspect, the present invention provides a double-layer bidirectional fan housing, wherein a space for accommodating a fan rotor is formed within the housing. The fan housing includes a first housing and a second housing. The first housing covers the outer periphery of a first blade, and the second housing covers the outer periphery of a second blade. A plurality of air guiding components are disposed within the first housing, and the plurality of air guiding components are distributed circumferentially along the first housing. Each air guiding component includes at least one first component. The first component is plate-shaped and has a guide surface and a spiral surface. The end of the air guiding component corresponds to the first air outlet of the fan. The second housing forms a spiral second air duct, and the end of the second housing forms the second air outlet of the fan.

[0015] By setting up a first shell and a second shell, different gas circulation paths are formed respectively, which can meet the various needs of indoor and indoor / outdoor gas circulation and accelerate the gas flow and conversion in the target space. The spiral surface of the air guide component forms an Archimedean spiral surface in the radial air outlet direction of the impeller, which builds up pressure in the radial air outlet of the impeller during the process of converting it into axial air outlet, and gradually and smoothly releases it, finally forming an axial air outlet with uniform wind pressure at the first air outlet.

[0016] Furthermore, the aforementioned air guiding assembly also includes a second assembly. This second assembly is generally wedge-shaped, possessing a guide plate and a helical plate. A guide surface is formed on the guide plate, and a helical surface is formed on the helical plate. The guide plate and the helical plate are arranged at a certain angle. Depending on the shape of the housing, by setting the angle between the guide plate and the helical plate, the airflow exiting the blades is orderly channeled and pressurized, reducing the friction between the airflow and the air guiding assembly, thereby increasing the unit airflow volume and velocity at the first air outlet. This achieves uniform velocity and pressure airflow when the fan is applied to housings of different shapes (such as square and rectangular).

[0017] Furthermore, the aforementioned set of air guiding components includes a first component and a second component, and several sets of air guiding components are distributed at equal intervals within the first housing. The first component and the second component cooperate to form several air duct structures within the first housing. In each air duct structure, a pressure-building zone (spiral surface) and a pressure-reducing zone (guide surface) are formed, thereby uniformly distributing airflow and uniformly building up air pressure within the housing, further ensuring that the fan can deliver air at a uniform speed and pressure when applied to housings of different shapes (such as square and rectangular).

[0018] Furthermore, the first housing is shaped like a trumpet, gradually widening from the upper end face to the lower end face, and each side wall of the first housing is arc-shaped. When the airflow is thrown out from the first blade, it is received and guided by the arc-shaped side walls of the first housing, reducing the impact between the airflow and the side walls, thereby reducing energy loss and noise.

[0019] Furthermore, the lower end of the first housing is lower than the lower end of the first blade of the wind turbine. This extends the contact curve between the first housing and the airflow, increasing the contact area; making the change of airflow direction more natural and smooth when the wind turbine changes direction, reducing energy loss, and lowering noise.

[0020] Furthermore, the second air duct has a pressure-building zone and a release zone. From the pressure-building zone to the release zone, the cross-section of the air duct gradually increases, and the cross-sectional area remains constant at the end of the second air duct and is equal to the cross-sectional area of ​​the second air outlet. This satisfies the requirements for airflow pressure building and stable air pressure output.

[0021] In another aspect, the present invention provides a double-layer bidirectional fan, comprising the aforementioned impeller and the aforementioned fan housing, wherein the impeller is housed within the fan housing, and further comprising: a motor connected to the impeller and capable of driving the impeller to rotate in both forward and reverse directions; a panel covering the first housing end, wherein an air inlet and a first air outlet arranged in a ring are formed on the panel; and a cover covering the second housing end, wherein the cover has an opening to accommodate a second air outlet of the second housing.

[0022] The fan of the present invention has the following characteristics: when the motor rotates in one direction, the first blade works and forms a pressure-equalizing air outlet at the first air outlet; when the motor rotates in the opposite direction, the second blade works and forms an air outlet at the second air outlet; the structure is ingeniously designed and has high working efficiency.

[0023] In another aspect, the present invention provides a bathroom heater, characterized in that it includes the aforementioned double-layer bidirectional fan, and an electric heating element is provided at the first air outlet. A uniform speed and pressure hot airflow is formed at the first air outlet.

[0024] The present invention has the following beneficial effects:

[0025] 1. By setting the first and second blades with opposite wind-gathering surfaces on the wind turbine, air can be generated in different directions when the wind turbine rotates in the forward and reverse directions. Combined with the design of the casing, two sets of gas circulation paths can be formed to meet the needs of indoor and indoor / outdoor gas circulation.

[0026] 2. By setting an air guide assembly distributed circumferentially within the first housing, the air guide assembly has a helical surface and a guide surface. During the process of converting the radial airflow from the impeller to axial airflow, pressure is built up and gradually released through the guide surface. The airflow delivered from the first blade of the impeller is guided and transported, ultimately forming an annular axial airflow with uniform wind pressure at the first air outlet. At the same time, through the design of the angle of the air guide assembly and the angle between the helical surface and the guide surface in the air guide assembly, the angle between the airflow and the helical surface and the guide surface is close to 0 (i.e., close to parallel) when the airflow enters the helical surface and the guide surface, thereby reducing the impact between the airflow and the housing, reducing wind pressure loss, and reducing the noise of the fan.

[0027] 3. By setting up a second shell, a second gas circulation path can be formed that is different from the gas circulation path formed by the first shell, so as to meet the needs of indoor and indoor / outdoor gas circulation and accelerate the gas flow and conversion in the target space; one fan solves the task that is performed by two fans in the existing technology, which can effectively reduce costs, while the fan structure is more compact and smaller in size.

[0028] 4. This invention has a wide range of applications and can be applied to fans and various devices that include fans, such as bathroom heaters, ventilation devices, air purification devices, etc.

[0029] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0030] Figure 1 A schematic diagram of the wind turbine structure in this invention;

[0031] Figure 2a A schematic diagram of a conventional wind turbine rotating in one direction;

[0032] Figure 2b Figure 2a When the wind turbine rotates at 800 rpm, the air volume (m³) at different heights of the wind turbine. 3 / s);

[0033] Figure 2c Figure 2a When the wind turbine rotates at 1200 rpm, the air volume (m³) at different heights of the wind turbine. 3 / s);

[0034] Figure 3a A schematic diagram of the wind turbine of the present invention rotating in one direction;

[0035] Figure 3b Figure 3aWhen the wind turbine rotates at 800 rpm, the air volume (m³) at different heights of the wind turbine. 3 / s) Figure 4a A schematic diagram of the wind turbine of the present invention rotating in another direction;

[0036] Figure 4b Figure 4a When the wind turbine rotates at 800 rpm, the air volume (m³) at different heights of the wind turbine. 3 / s)

[0037] Figure 5 This is a schematic diagram of the structure of the fan of the present invention;

[0038] Figure 6 This is another structural schematic diagram of the fan of the present invention;

[0039] Figure 7 This is an exploded view of the fan of the present invention;

[0040] Figure 8 for Figure 5 Sectional view along axis AA;

[0041] Figure 9 This is a schematic diagram of the outer casing and air guide assembly of the present invention;

[0042] Figure 10 This is a schematic diagram of the second housing in the present invention;

[0043] Figure 11 This is a schematic diagram of the gas flow direction of a fan with a structure according to the present invention in one working state;

[0044] Figure 12 This is a schematic diagram of the gas flow direction of a fan with one structure of the present invention in another working state;

[0045] Figure 13 This is a schematic diagram of the gas flow direction of a fan with another structure according to the present invention in one working state;

[0046] Figure 14 This is a schematic diagram of the gas flow direction of a fan with another structure according to the present invention in another working state;

[0047] In the diagram, the wind turbine is 100, the main body is 101, the blades are 102, the first blade is 103, the second blade is 104, and the wind-gathering surface is 105.

[0048] First housing 201, inner housing 201a, outer housing 201b, second housing 202, air guide assembly 203, first assembly 204, second assembly 205, guide surface 206, spiral surface 207, guide plate 208, spiral plate 209, second air outlet 210.

[0049] Fan 300, bidirectional motor 301, panel 302, air inlet 303, first air outlet 304, cover 305, PTC heating element 306;

[0050] Mounting plate 400. Detailed Implementation

[0051] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0052] Example 1:

[0053] like Figure 1 As shown, this embodiment provides a double-layer bidirectional wind turbine 100, including a body 101 and a plurality of blades 102 disposed on the body, each blade forming an arc-shaped wind-gathering surface 105. The blades 102 include a first blade 103 and a second blade 104, the first blade 103 and the second blade 104 having wind-gathering surfaces 105 facing opposite directions. The term "opposite" here can refer to the wind-gathering surfaces being arranged in opposite directions, or it can refer to the wind-gathering surfaces being arranged at a certain angle to each other.

[0054] In this embodiment, each blade 102 is divided into a first blade 103 and a second blade 104 along the height direction of the wind turbine. That is, each blade is divided into two segments in height, with the upper segment being the first blade 103 and the lower segment being the second blade 104. The number of first blades and second blades is equal, and they have the same width. The bottom edge of the first blade 103 and the top edge of the second blade 104 are located on the same horizontal line.

[0055] In the vertical direction, the height ratio of the first blade 103 and the second blade 104 can be set according to the requirements of air volume in different directions, such as 1:1, 1:2, 1:0.5, 1:0.8, 1:3, etc. In this embodiment, the first blade 103 and the second blade 104 have the same height.

[0056] The double-layer bidirectional wind turbine 100 of this embodiment has a first blade and a second blade with opposite wind-gathering surfaces, maximizing the efficiency of air intake energy. Specifically, when the first blade 103 is working, the second blade 104 does not intake air and does not consume air intake energy; all the airflow enters the first blade, ensuring that the air intake energy is exactly what the first blade needs to operate. Similarly, when the second blade 104 is working, the first blade 103 does not consume air intake energy; all the airflow enters the second blade, ensuring that the air intake energy is exactly what the second blade needs to operate. This reduces the energy consumption of the wind turbine and improves the working efficiency of the blades.

[0057] The applicant's research revealed that when a wind turbine rotates at high speed, the airflow energy distributed across the blades varies at different heights. Due to centrifugal force, the airflow is primarily concentrated at the bottom of the turbine, and the higher the turbine's rotational speed, the more concentrated the airflow becomes at the bottom. Therefore, traditional methods of increasing the turbine's output by raising the turbine's height are not very effective, especially at high speeds. Figure 2a A schematic diagram of a wind turbine rotating in one direction is shown, with the blades of the wind turbine having a wind-gathering surface in the same direction; Figure 2b and Figure 2c The figures show the air volume (m³) at different heights of the wind turbine when the turbine rotates at 800 rpm and 1200 rpm, respectively. 3 This explains why increasing the height of the impeller in traditional fans does not result in a significant increase in air volume.

[0058] The double-layer bidirectional impeller 100 of this invention has a first blade and a second blade with opposite air-gathering surfaces, maximizing the efficiency of air intake energy. When the motor rotates in the forward direction, the first blade operates, and the exhaust air is mainly concentrated at the bottom of the first blade. The second blade does not gather air, does not produce exhaust air, and does not consume air intake energy; for example... Figure 3a As shown in 3b, when the motor rotates in the reverse direction, the second blade operates, and the airflow is mainly concentrated at the top of the second blade. The first blade does not concentrate airflow, does not produce airflow, and does not consume intake air energy. Figure 4a As shown in Figure 4b, due to the aforementioned characteristics of the centrifugal fan's airflow distribution, by arranging blades with opposite air-gathering surfaces on a single impeller, the airflow can be concentrated at the bottom and top of the impeller, achieving an airflow efficiency comparable to a conventional impeller of the same height. Taking a 60mm high impeller as an example, a conventional impeller with blades having the same air-gathering surface in one direction produces an airflow of 1 unit at 800 rpm. The impeller of this invention, at the same speed, achieves an airflow of 0.8-0.9 units. The airflow loss due to blade height can be appropriately compensated for by increasing the rotational speed. Therefore, the impeller of this invention can achieve: one impeller, using the same motor, completes airflow in two directions without increasing the impeller thickness to achieve the same airflow effect, resulting in high working efficiency.

[0059] Example 2:

[0060] like Figure 5-10As shown, this embodiment provides a double-layer bidirectional wind turbine housing, forming a space within the housing to accommodate a wind turbine. The wind turbine housing includes a first housing 201 and a second housing 202. In a specific application example, the first housing 201 and the second housing 202 can be respectively fitted onto different height positions in the axial direction of a wind turbine. In a specific application example, the wind turbine housing of this embodiment is applied to the wind turbine 100 of this embodiment. In this case, the first housing 201 is disposed on the outer periphery of the first blade 103, and the second housing 202 is disposed on the outer periphery of the second blade 104.

[0061] like Figure 7 , Figure 8 As shown, the first housing 201 is flared in shape, gradually increasing in size from the upper end face to the lower end face, and the inner sidewall of the first housing is arc-shaped. In one specific embodiment, the cross-section of the end of the first housing 201 can be square; in another specific embodiment, the cross-section of the end of the first housing 201 can also be circular. Here, the end of the first housing 201 facing the fan panel is defined as the end of the first housing, as... Figure 7 As shown.

[0062] Several sets of air guiding components 203 are provided inside the first housing 201. The several sets of air guiding components 203 are distributed along the circumference of the first housing. The end of the air guiding component corresponds to the first air outlet of the fan. That is, the air guiding component guides the airflow thrown out from the impeller to the first air outlet of the fan. Depending on the specific shape of the first housing, the air guide assembly 203 can have different configurations: when the first housing is circular, i.e., when forming a circular fan, bathroom heater, air purifier, etc., it can only include the first component 204, and several first components 204 are distributed at equal intervals along the circumference of the circular first housing; when the first housing is square or rectangular, i.e., when forming a square or rectangular fan, bathroom heater, air purifier, etc., the air guide assembly 203 adopts a combination of the first component 204 and the second component 205, and several sets of air guide assemblies 203 are distributed at equal intervals along the circumference of the square first housing. Where the airflow direction needs to be adjusted, such as near the four right angles of the square housing, the second component 205 is set, and the airflow direction is adjusted by adjusting the included angle of the guide plate and the spiral plate in the second component, and adjusting the angle of the guide surface and the spiral surface located thereon.

[0063] like Figure 9As shown, the first component 204 is plate-shaped with two surfaces: a guide surface 206 and a helical surface 207. The second component 205 is generally wedge-shaped, with a guide plate 208 and a helical plate 209. The guide surface 206 is formed on the guide plate, and the helical surface 207 is formed on the helical plate. The guide plate and the helical plate are arranged at a certain angle. In the air guiding assembly, the guide surface mainly functions to divide the airflow, thereby ultimately forming a ring-shaped and uniform airflow at the first air outlet of the fan. The helical surface mainly functions to pressurize and divide the airflow, thereby ensuring a ring-shaped and uniform airflow at the first air outlet and maintaining the wind speed.

[0064] Depending on the shape of the casing, by setting the included angle between the guide plate and the spiral plate, the airflow coming out of the blades is orderly divided and pressurized, reducing the friction between the airflow and the air guide assembly, thereby increasing the unit air volume and wind speed at the first air outlet; thus achieving uniform speed and pressure airflow when the fan is applied to casings of different shapes (such as square and rectangular).

[0065] As a specific implementation method, such as Figure 7 As shown, the first housing 201 may include an inner housing 201a and an outer housing 201b sequentially nested together. The aforementioned air guide assembly 203 is provided on the side of the outer housing 201b facing the inner housing. A ring of air outlets is formed around the outer housing 201b, and the position of these air outlets corresponds to the first air outlet of the fan. In this way, corresponding air ducts are formed between each air guide assembly 203 and the inner housing 201a and the outer housing 201b. The airflow delivered from the impeller passes through the air guide assembly 203, enters the corresponding air duct, and is pressurized and released through these air ducts, finally being output smoothly and evenly from the first air outlet of the fan. The air guide assembly 203 forms several air ducts between the inner shell 201a and the outer shell 201b, which are established in the form of a volute (or part of a volute) conforming to the Archimedean spiral. Thus, each of the air ducts has a pressure building zone and a release zone, thereby building pressure in the radial air outlet of the impeller during the process of converting it into axial air outlet, and gradually releasing it smoothly, ultimately forming axial air outlet with uniform air pressure at the first air outlet.

[0066] In a preferred embodiment, such as Figure 8As shown, the first housing 201 has a larger dimension in the height direction; specifically, the lower end of the first housing 201 is lower than the lower end of the impeller housed within it. This allows the first housing 201 to have a longer airflow delivery path. When the radial airflow of the centrifugal impeller needs to be converted to axial airflow, a corresponding air duct is formed between the air guide assembly 203 inside the first housing 201 and the inner housing 201a, and after passing through the arc-shaped sidewall of the first housing 201, the radial airflow becomes axial airflow. The airflow is well received, transported, and redirected, which can significantly reduce the impact and friction caused by the change of wind direction, thereby greatly improving working efficiency, reducing wind speed loss, and reducing noise. Noise can come from turbulence, eddies formed during the airflow's own transport process, and impact with the housing. This application, through the design of the housing, minimizes the impact and friction between the airflow and the housing, thereby reducing airflow energy loss and greatly reducing noise, thus improving the working efficiency of the impeller.

[0067] like Figure 10 As shown, the second housing 202 covers the outer periphery of the second blade 104 and is shaped like a spiral volute. Inside the volute is the second air duct, and the end of the second housing forms the second air outlet 210 of the fan. To increase the volume and capacity within the volute cavity, the radial dimension of the second housing 202 expands along an Archimedean spiral, while its axial dimension also gradually increases. That is, in the axial direction, it gradually expands along an Archimedean involute in the radial direction to the air outlet, thereby increasing the gas capacity of the second housing to ensure sufficient airflow, velocity, and pressure at the air outlet. The second housing 202 contains the second air duct, which has a pressure-building zone and a release zone. From the pressure-building zone to the release zone, the cross-sectional area of ​​the air duct gradually increases, remaining constant at the end of the air duct and equal to the cross-sectional area of ​​the second air outlet 210.

[0068] Example 3:

[0069] like Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown, this embodiment provides a double-layer bidirectional fan 300, comprising the impeller 100 described in Embodiment 1 and the fan housing described in Embodiment 2. The impeller 100 is housed within the fan housing. The fan also includes: a bidirectional motor 301 connected to the impeller 100 and capable of driving the impeller to rotate in both forward and reverse directions; and a panel 302 covering the end of the first housing. In this embodiment, the fan has a recessed structure, meaning that the fan panel 302 is lower than the fan mounting plate 400. Figure 5 As shown in Figures 6 and 8, the mounting plate 400 is on the same horizontal plane as the mounting surface (such as a ceiling panel), thereby forming an air inlet 303 on the side of the fan, above the panel 302.

[0070] like Figure 13 , 14 As shown, in other embodiments, an air inlet 303 may also be formed on the fan panel. Specifically, an air inlet may be formed in the center or around the perimeter of the panel.

[0071] A first air outlet 304 is formed in a ring on the panel 302; the fan 300 also includes a cover 304, which covers the end of the second housing, and the cover has an opening to accommodate a second air outlet 210 of the second housing.

[0072] The working process and working principle of the double-layer bidirectional fan in this embodiment are as follows:

[0073] like Figure 11 As shown, when the motor rotates in the forward direction, the first blade 103 of the impeller operates, and air flows along the direction indicated by the arrow in the figure. Air enters the fan housing from the air inlet, is then radially ejected along the first blade 103, and is received, transported, and redirected by the first housing 201 of the fan. Finally, a uniform and pressure-equal airflow is formed at the first air outlet of the fan. This operating mode corresponds to the fan's blowing mode. In this mode, if an electric heating element, such as a PTC heating element 306, is installed at the fan outlet, hot air can be generated, making it suitable for bathroom heater-type products.

[0074] like Figure 12 As shown, when the motor rotates in the reverse direction, the second blade 104 of the impeller operates, and air flows along the direction indicated by the arrow in the figure. It enters the fan housing from the air inlet, and is then thrown out radially along the second blade 104. It passes through the second housing 202 of the fan, is pressurized within the second housing, and is released, finally forming an outlet at the second air outlet of the fan. This operating mode corresponds to the ventilation operating mode of the fan.

[0075] Similarly, in the case where an air inlet is formed on the panel, such as Figure 13 As shown in Figure 14, its working process and working principle are the same, and will not be described in detail here.

[0076] As can be seen, the double-layer bidirectional fan of the present invention uses only one motor and one impeller to achieve both blowing and ventilation functions, and has low energy loss, high fan efficiency, and compact product structure.

[0077] Example 4:

[0078] This embodiment provides a bathroom heater, which includes the double-layer bidirectional fan 300 described in embodiment 3. An electric heating element, such as a PTC heating element 306, is provided at the first air outlet 304, thereby forming a uniform speed and pressure hot airflow at the first air outlet 304.

Claims

1. A double-layer bidirectional fan, characterized in that: It includes a wind turbine and a fan housing, wherein the wind turbine is housed within the fan housing. The wind turbine is a double-layer bidirectional wind turbine, including a body and several blades disposed on the body. Each blade forms an arc-shaped wind-gathering surface. Each blade includes a first blade and a second blade disposed along the height direction of the wind turbine. The wind-gathering surfaces of the first blade and the second blade are disposed in opposite directions. The fan casing is a double-layered, bidirectional fan casing, forming a space within the casing to accommodate the impeller. The fan casing includes a first casing and a second casing. The first casing covers the outer periphery of the first blade, and the second casing covers the outer periphery of the second blade. Several sets of air guide assemblies are arranged within the first casing, distributed circumferentially along the first casing. Each set of air guide assemblies includes at least one first assembly. The first assembly is plate-shaped, with a guide surface and an Archimedean spiral surface, capable of smoothly converting radial airflow into axial airflow. The end of the air guide assembly corresponds to the first air outlet of the fan. The second casing forms a spiral-shaped second air duct, which has a pressure-building zone and a release zone. The cross-section of the air duct gradually increases from the pressure-building zone to the release zone, forming a stable air pressure output. The end of the second casing forms the second air outlet of the fan. The aforementioned set of air guiding components also includes a second component, which is generally wedge-shaped and has a guide plate and a spiral plate. A guide surface is formed on the guide plate, and a spiral surface is formed on the spiral plate. The guide plate and the spiral plate are arranged at a certain angle. It also includes: a motor connected to the wind turbine and capable of driving the wind turbine to rotate in both forward and reverse directions; a panel covering the first housing end, on which an air inlet and a first air outlet distributed in a ring are formed; a cover covering the second housing end, the cover having an opening to accommodate a second air outlet of the second housing; the air inlet of the panel is lower than the mounting surface of the fan.

2. The double-layer bidirectional fan according to claim 1, characterized in that: The bottom edge of the first blade and the top edge of the second blade are on the same horizontal line, and the height ratio of the first blade to the second blade is 1:0.5 to 2.

3. The double-layer bidirectional fan according to claim 1, characterized in that: The aforementioned set of air guiding components includes a first component and a second component, and several sets of air guiding components are distributed at equal intervals within the first housing.

4. The double-layer bidirectional fan according to claim 1, characterized in that: The first housing is in the shape of a trumpet, which gradually increases in size from the upper end face to the lower end face, and the side walls of the first housing are arc-shaped.

5. The double-layer bidirectional fan according to claim 4, characterized in that: The lower end of the first housing is lower than the lower end of the first blade of the wind turbine.

6. The double-layer bidirectional fan according to claim 1, characterized in that: The cross-sectional area of ​​the last section of the second air duct remains unchanged and is equal to the cross-sectional area of ​​the second air outlet.

7. A bathroom heater, characterized in that, The double-layer bidirectional fan according to any one of claims 1-6 is provided with an electric heating element at the first air outlet.

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