Cross-flow air duct and blower

Abstract

A once-through air duct and a blowing device are disclosed. The once-through air duct comprises a volute (1) and a volute tongue (2). The volute (1) comprises a first body (101), a first side of the first body (101) being an intake side and a second side being an air blowing side. The volute tongue (2) comprises a second body (201), a first side of the second body (201) being an intake side and a second side being an air blowing side, an intake port being formed between the first sides and an air blowing port being formed between the second sides. The first air blowing openings and the second air blowing openings are alternately arranged so as to be spaced apart along the axial direction of the volute (1). In the once-through air duct, a plurality of blowing areas in different directions are formed, which expands the overall width of the air blowing and improves the air blowing range.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This invention claims priority to a Chinese patent application filed with the China Patent Office on September 30, 2021, bearing application number 202111168578.4 and entitled "Through-flow air duct and blower device," the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the field of electric fans, and in particular to cross-flow air ducts and blowers. [Background technology]

[0003] As the quality of life improves, consumers demand more diverse fan functions and performance, and fans that can provide a comfortable experience are becoming more popular. Currently, tower fans on the market have a slender appearance, a small footprint, and no exposed blades, making them safer. Their multi-blade through-flow impellers and long-stroke air ducts enable uniform up-down and down-flow wind power switching, ensuring continuous airflow. However, tower fans on the market have narrow outlets due to their tower shape and small blade diameters. Furthermore, the volutes of most through-flow air ducts are designed as Archimedes spirals or logarithmic spirals. While the fluid is blown tangentially along the spiral, the wind pressure near the volute line is higher than that away from the volute. This results in a difference in wind speed between the volute and the volute at the outlet, resulting in uneven wind speeds on both sides of the outlet. In addition, since the airflow area is limited, the airflow range is narrow and the user's body surface temperature is not uniform. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention provides a once-through air duct and a blower that can improve the air blowing range by solving the technical problem of the narrow air blowing range of once-through air ducts in the related art. [Means for solving the problem]

[0005] The present invention provides a once-through air duct. The once-through air duct includes a volute and a volute tongue, the volute including a first body, a first side of the first body being an intake side, a second side of the first body being a blowing side, the volute tongue being spaced apart from the volute, the volute tongue including a second body, a first side of the second body being an intake side, and a second side of the second body being a blowing side. An installation space for installing an impeller is formed between the first body and the second body, an intake port is formed between the first side of the first body and the first side of the second body, and an air outlet is formed between the second side of the first body and the second side of the second body. The air outlet includes a plurality of first air outlets and a plurality of second air outlets, the first air outlets and the second air outlets being alternately arranged and spaced apart along the axial direction of the volute.

[0006] A plurality of first air guide plates are provided on a second side of the first body and spaced apart along the axial direction of the volute, and the first air blowing opening is formed between the first air guide plates and the second body.

[0007] A second side of the second body is provided with a plurality of second air guide plates spaced apart along the axial direction of the volute, the second air outlet is formed between the second air guide plates and the first body, and the first air guide plates and the second air guide plates are alternately installed in the axial direction of the volute.

[0008] The first air guide plate includes a first plate body and a first air guide surface provided at an end of the first plate body and extending to the outside of the installation space. First body A second airflow guiding surface is provided on the second side, and the second airflow guiding surface extends to the outside of the mounting space.

[0009] The second air guide plate includes a second plate body and a third air guide surface provided at an end of the second plate body and extending to the outside of the installation space. Second bodyA fourth airflow guiding surface is provided on the second side, and the fourth airflow guiding surface extends to the outside of the mounting space.

[0010] The central symmetric plane between the first and second air guide surfaces is defined as a first plane, and the central symmetric plane between the third and fourth air guide surfaces is defined as a second plane. The included angle between the first and second planes is θ, and 0<θ≦40°.

[0011] The central symmetry plane between the second side of the first body and the second side of the second body is defined as a dislocation reference plane, the first surface and the second surface are located on either side of the dislocation reference plane, the included angle between the first surface and the dislocation reference plane is θ1, and the included angle between the second surface and the dislocation reference plane is θ2, where 0<θ1≦20° and / or 0<θ2≦20°.

[0012] A plurality of third air guide plates are provided on a first side of the first body and spaced apart along the axial direction of the volute.

[0013] An air intake and air guide surface is provided on the first side of the second body.

[0014] The through-flow air duct further includes a blower grid provided at the blower opening, the blower grid including first and second grid segments alternately arranged along the axial direction of the volute. A plurality of first and second grid segments are provided, each of the first grid segment corresponding to the first blower opening and the second grid segment corresponding to the second blower opening. Furthermore, the longitudinal central symmetry plane of the first grid segment is adjacent to the second side of the first body, and the longitudinal central symmetry plane of the second grid segment is adjacent to the second side of the second body.

[0015] The longitudinal central symmetry plane of the first grid segment is defined as a first central symmetry plane, and the longitudinal central symmetry plane of the second grid segment is defined as a second central symmetry plane, and the included angle between the first central symmetry plane and the second central symmetry plane is β, where 0<β≦50°.

[0016] The central symmetry plane between the second side of the first body and the second side of the second body is defined as a dislocation reference plane, and the included angle between the first central symmetry plane and the dislocation reference plane is β1, and the included angle between the second central symmetry plane and the dislocation reference plane is β2, where 0<β1≦25° and / or 0<β2≦25°.

[0017] The once-through air duct further comprises an impeller disposed in the mounting space, the impeller having a diameter D.

[0018] The cross section of the second body is an arc, and the axis of the second body and the axis of the impeller are on the same line.

[0019] The minimum radial distance between the second body and the impeller is A, and 1D / 28≦A≦1D / 10.

[0020] The position where the distance between the first body and the impeller is smallest is the volute throat, and the distance between the volute throat and the impeller is B, where 1D / 22≦B≦1D / 11.

[0021] The length of the first grid segment and / or the second grid segment is C, where 1D / 9≦C≦1D / 4.

[0022] The radial distance between the blower grid and the impeller is F, where 1D / 6≦F≦1D / 3.

[0023] The impeller has a plurality of impeller segments, and the distance between two adjacent first baffle plates, or two adjacent second baffle plates, or two adjacent first grid segments, or two adjacent second grid segments is the length of N impeller segments, where 1≦N≦3.

[0024] This embodiment further provides a blower, which includes the aforementioned through-flow air duct. [Effects of the Invention]

[0025] The technical solution of the present invention has the following advantages: The once-through air duct of the present invention has an air outlet and an air intake molded between the first and second bodies, and the air outlet is divided into a first air outlet and multiple second air outlets arranged alternately along the axial direction of the volute, thereby forming multiple air outlet areas with different directions. If the side where the volute is located is defined as the left side and the side where the volute tongue is located is defined as the right side, the left side where the first air outlet is located is to the left of the left side where the second air outlet is located, and the right side of the second air outlet is to the right of the right side of the first air outlet. This increases the overall width of the air outlet and improves the air outlet range. [Brief explanation of the drawings]

[0026] In order to more clearly describe the technical solutions of the specific embodiments of the present invention or the related art, the following will briefly introduce the drawings used to describe the specific embodiments or the related art. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative work. [Figure 1] 1 is a structural schematic diagram of a cross-flow air duct according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a structural schematic diagram of the impeller shown in FIG. 1. [Figure 3] FIG. 2 is a top view of FIG. [Figure 4] FIG. 2 is a structural schematic diagram of the once-through air duct shown in FIG. 1 when no air blower grid is provided. [Figure 5] FIG. 5 is a structural schematic diagram of the intake side portion shown in FIG. 4. [Figure 6] FIG. 6 is a structural schematic diagram of the once-through air duct shown in FIG. 5 when no impeller is provided. [Figure 7] FIG. 2 is a structural schematic diagram of a volute. [Figure 8] This is a schematic diagram of the structure of one angle of the volute tongue. [Figure 9] FIG. 10 is a structural schematic diagram of another angle of the volute tongue. [Figure 10] FIG. 5 is a top view of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0027] The technical means of the present invention will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, and not all of the embodiments. Any other embodiments that can be obtained by those skilled in the art based on the embodiments of the present invention without any creative work fall within the scope of protection of the present invention.

[0028] In the description of the present invention, the orientations or positional relationships indicated by terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are orientations or positional relationships shown in the drawings, and are used merely to explain and simplify the present invention. They do not indicate or imply that the devices or elements shown necessarily have a specific orientation or are constructed or operated in a specific orientation, and therefore should not be understood as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used merely for descriptive purposes and should not be understood as indicating or implying relative importance.

[0029] In the description of the present invention, unless otherwise expressly defined or limited, the terms "attach," "couple," and "connect" should be understood in a broad sense. For example, they may refer to a fixed connection, a detachable connection, or an integral connection, and may also refer to a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, or a connection within two elements. Those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0030] Furthermore, the technical configurations according to the different embodiments of the present invention described below can be combined as long as they are not inconsistent with each other.

[0031] Example 1 As the quality of life improves, consumers demand more diverse fan functions and performance, and fans that can provide a comfortable experience are becoming more popular. Currently, tower fans on the market have a slender appearance, a small footprint, and no exposed blades, making them safer. Their multi-blade through-flow impellers and long-stroke air ducts enable uniform up-down and down-flow wind power switching, ensuring continuous airflow. However, tower fans on the market have narrow outlets due to the tower shape and small blade diameter. Furthermore, the volutes of most through-flow air ducts are designed as Archimedes spirals or logarithmic spirals. While the fluid is blown tangentially along the spiral line, the wind pressure near the volute line is higher than that away from the volute. This results in a difference in wind speed between the volute and the volute at the outlet, resulting in uneven wind speeds on both sides of the outlet. Furthermore, since the airflow area is limited, the airflow range is narrow and the temperature of the user's body surface is not uniform.

[0032] In view of this, as shown in FIGS. 1 to 10, this embodiment provides a cross-flow air duct that can improve the air blowing range.

[0033] In one embodiment, the once-through air duct includes a volute 1 and a volute tongue 2. The volute 1 includes a first body 101, a first side of which is the intake side, and a second side of which is the blowing side. The volute tongue 2 is spaced apart from the volute 1, and includes a second body 201, a first side of which is the intake side, and a second side of which is the blowing side. An attachment space for attaching the impeller 3 is formed between the first body 101 and the second body 201. An air intake port is formed between the first side of the first body 101 and the first side of the second body 201. An air outlet is formed between the second side of the first body 101 and the second side of the second body 201. The air outlet includes a plurality of first air outlets and a plurality of second air outlets, and the first air outlets and the second air outlets are alternately arranged so as to be spaced apart along the axial direction of the volute.

[0034] An air outlet and an air intake are molded between the first body 101 and the second body 201, and the air outlet is divided into a first air outlet and a plurality of second air outlets that are arranged alternately along the axial direction of the volute 1, thereby forming a plurality of air outlet areas with different directions. A plurality of first air guide plates 102 are provided on the second side of the first body 101 and spaced apart along the axial direction of the volute 1, and the first air outlet is molded between the first air guide plates 102 and the second body. A plurality of second air guide plates 202 are provided on the second side of the second body 201 and spaced apart along the axial direction of the volute 1, and the second air outlet is molded between the second air guide plates 202 and the first body 101, and the first air guide plates 102 and second air guide plates 202 are arranged alternately in the axial direction of the volute 1. If the side where the volute 1 is located is defined as the left side and the side where the volute tongue 2 is located is defined as the right side, the left side where the first air blowing opening is located is to the left of the left side where the second air blowing opening is located, and the right side of the second air blowing opening is to the right of the right side of the first air blowing opening. This increases the overall width of the air blowing and improves the air blowing range.

[0035] Based on the above-described embodiments, in some embodiments, the first air guide plate 102 includes a first plate body 1021 and a first air guide surface 1022 provided at an end of the first plate body 1021 and extending outside the installation space. A second air guide surface 103 is provided on a second side of the first plate body 1021, and the second air guide surface 103 extends outside the installation space. The second air guide plate 202 includes a second plate body 2021 and a third air guide surface 2022 provided at an end of the second plate body 2021 and extending outside the installation space. A fourth air guide surface 203 is provided on the second side of the second plate body 2021, and the fourth air guide surface 203 extends outside the installation space. In this embodiment, the first air guiding surface 1022, the second air guiding surface 103, the third air guiding surface 2022, and the fourth air guiding surface 203 are provided to guide the air blowing direction, ensuring that the air is blown outward and preventing turbulence in the airflow at the air blowing point. In one alternative embodiment, guide slopes are provided on the end face of the first plate body 1021, the end face of the second plate body 2021, the second side of the first body 101, and the second side of the second body 201, respectively, and the guide slopes can be used to guide the air blowing direction.

[0036] Specifically, in one embodiment, the first airflow guiding surface 1022, the second airflow guiding surface 103, the third airflow guiding surface 2022, and the fourth airflow guiding surface 203 can be provided so as to extend outward along the radial direction of the impeller 3, respectively.

[0037] Building on the above-described embodiments, in some embodiments, as shown in FIG. 3rd Wind Guidance Plane 2022 and the second airflow guiding surface 103 are defined as a first surface 6. First wind guide surface 1022 The central symmetric plane between the first surface 6 and the second surface 7 and the fourth airflow guiding surface 203 is defined as the second surface 7. The included angle between the first surface 6 and the second surface 7 is θ, which is 0<θ≦40°. In this embodiment, the included angle between the first surface 6 and the second surface 7 is the transition angle between the first and second airflow areas. In this embodiment, by limiting the transition angle between the first and second airflow areas, it is possible to prevent the airflow velocity and pressure distribution inside the cross-flow air duct from becoming more uneven due to an excessive transition angle. Furthermore, when such uneven airflow acts on the volute tongue 2, volute 1, and impeller 3, time-dependent airflow pressure pulsation is generated. The airflow pulsation generated by the rotation of the impeller 3 blades continuously and periodically impacts the air duct body, including the volute tongue 2 and volute 1, increasing the peak value of rotational noise. The greater the airflow nonuniformity, the stronger the noise. If the deviation is too large, the flow continuity inside the impeller 3 will be destroyed, resulting in a noticeable left-right deviation in the airflow, which will affect the air volume and blowing effect of the air duct. Therefore, in this embodiment, the displacement angle between the first blowing area and the second blowing area is limited, thereby expanding the blowing width and improving the blowing range, while suppressing noise increases and not affecting the air volume of the air duct.

[0038] Specifically, in one embodiment, θ is 40°. In some alternative embodiments, θ is 20° or 30°.

[0039] Based on the above-described embodiments, in some embodiments, the central symmetry plane between the second side of the first body 101 and the second side of the second body 201 is defined as the translation reference plane 5, the first surface 6 and the second surface 7 are located on either side of the translation reference plane 5, the included angle between the first surface 6 and the translation reference plane 5 is θ1, the included angle between the second surface 7 and the translation reference plane 5 is θ2, where 0<θ1≦20° and 0<θ2≦20° are satisfied. Alternative embodiments include 0<θ1≦20° and θ2 greater than 20°, or θ1 greater than 20° and 0<θ2≦20°. The chord line of the volute 1 of the once-through air duct is spirally shaped, and the fluid at the outlet is delivered in a direction tangential to the chord line of the volute 1 itself. Therefore, the wind speed at the extension of the spiral line near the back plate of the volute 1 is higher than the wind speed at the extension of the spiral line away from the volute 1. If the transition angle between the first and second air flow areas is too large, the wind pressure gradient between the adjacent air duct segments will be large, causing uneven air flow speeds in the adjacent first and second air flow areas and affecting noise and sound quality. Therefore, in this embodiment, the included angle between the first surface 6 and the transition reference plane 5 and the included angle between the second surface 7 and the transition reference plane 5 are limited, i.e., the included angle between the center of the first air flow area and the transition reference plane 5 and the included angle between the center of the second air flow area and the transition reference plane 5 are limited, thereby avoiding uneven air flow speeds in the adjacent first and second air flow areas, preventing an increase in noise, and ensuring sound quality.

[0040] Based on the above-described embodiment, in some embodiments, a plurality of third air guide plates 104 are provided on the first side of the first body 101, spaced apart along the axial direction of the volute 1. In this embodiment, the arrangement of the third air guide plates 104 can ensure the stability of the through-flow air duct.

[0041] Based on the above-described embodiment, in some embodiments, an intake air guide surface 204 is provided on the first side of the second body 201. In this embodiment, the intake air guide surface 204 cooperates with the volute 1 to allow the outside air to smoothly enter the through-flow air duct. The intake air guide surface 204 is an inclined surface extending along the radial direction of the impeller 3.

[0042] The once-through air duct further includes a blower grid 4 provided at the blower opening, and the blower grid 4 includes first grid segments 401 and second grid segments 402 arranged alternately along the axial direction of the volute 1. A plurality of first grid segments 401 and a plurality of second grid segments 402 are provided, and the longitudinal central symmetry plane of the first grid segment 401 is adjacent to the second side of the first body 101, while the longitudinal central symmetry plane of the second grid segment 402 is adjacent to the second side of the second body 201. The longitudinal central symmetry planes are in the same plane as the axis of the impeller 3.

[0043] In this embodiment, the first grid segments 401 and the second grid segments 402 are alternately arranged, and the longitudinal central symmetry plane of the first grid segment 401 is adjacent to the second side of the first body 101, and the longitudinal central symmetry plane of the second grid segment 402 is adjacent to the second side of the second body 201, and the first grid segment 401 is adjacent to the second side of the first body 101. 2 The air blowing opening is provided in correspondence with the 1 The grid segment 402 is arranged to correspond to the second air outlet, with the second side of the first body 101 located on the left side and the second side of the second body 201 located on the right side, which effectively solves the problem of the narrow airflow range of conventional air ducts and ensures the continuity of the up-down airflow switching operation of the tower fan's cross-flow air duct, while also realizing airflow over a wider range, improving the overall airflow feel of the device and enhancing the user's comfort.

[0044] Based on the above-described embodiment, in some embodiments, the longitudinal central symmetry plane of the first grid segment 401 is defined as the first central symmetry plane 4011, and the longitudinal central symmetry plane of the second grid segment 402 is defined as the second central symmetry plane 4021. The included angle β between the first central symmetry plane 4011 and the second central symmetry plane 4021 is 0<β≦50°. The included angle between the first central symmetry plane 4011 and the second central symmetry plane 4021 is the displacement angle between the first grid segment 401 and the second grid segment 402. If the displacement angle between the first grid segment 401 and the second grid segment 402 is too large, noise and airflow will be abnormal. In view of this, in this embodiment, the displacement angle between the first grid segment 401 and the second grid segment 402 is limited to prevent noise increase and ensure airflow while ensuring the airflow range.

[0045] Based on the above-described embodiments, in some embodiments, the central symmetry plane between the second side of the first body 101 and the second side of the second body 201 is defined as the dislocation reference plane 5, the included angle between the first central symmetry plane 4011 and the dislocation reference plane 5 is β1, and the included angle between the second central symmetry plane 4021 and the dislocation reference plane 5 is β2, where 0<β1≦25° and 0<β2≦25°. In alternative embodiments, 0<β1≦25° and β2 is greater than 25°, or 0<β2≦25° and β1 is greater than 25°. In this embodiment, the included angle between the first central symmetry plane 4011 and the dislocation reference plane 5 is the left-deflection angle of the first grid segment 401, and the included angle between the second central symmetry plane 4021 and the dislocation reference plane 5 is the right-deflection angle of the second grid segment 402. In this embodiment, the deflection angles of the first grid segment 401 and the second grid segment 402 are further limited to prevent an increase in noise and ensure the air volume, while ensuring the airflow range.

[0046] Based on the above-described embodiment, in some embodiments, the length of the first grid segment 401 and / or the second grid segment 402 is C, where 1D / 9≦C≦1D / 4. If the length of the first grid segment 401 or the second grid segment 402 is too short, not only will the air guidance effect be weak, but the wind pressure at the air outlet will be insufficient, reducing the wind speed and affecting the airflow effect of the air duct. On the other hand, if the length of the first grid segment 401 or the second grid segment 402 is too long, the dynamic interference between the grid and the blown fluid will increase, resulting in a higher noise peak. Therefore, in this embodiment, by limiting the length of the first grid segment 401 or the second grid segment 402, it is possible to suppress an increase in noise while ensuring the airflow effect. Note that the lengths of the first grid segment 401 and the second grid segment 402 are measured in the airflow direction.

[0047] In one embodiment, the first grid segment 401 and the second grid segment 402 are equal in length. In other alternative embodiments, the length of the first grid segment 401 and the length of the second grid segment 402 are not equal.

[0048] Based on the above-described embodiments, in some embodiments, the once-through air duct further includes an impeller 3 disposed within the installation space, and the impeller 3 has a diameter D. In this embodiment, the volute 1, the volute tongue 2, the impeller 3, and the blower grid 4 collectively form the once-through air duct.

[0049] Based on the above-mentioned embodiment, in some embodiments, the cross section of the second body 201 is a circular arc, and the axis of the second body 201 is collinear with the axis of the impeller 3. In such embodiments, the volute tongue 2 can effectively guide the airflow and play the role of a diverting cone.

[0050] Based on the above-described embodiment, in some embodiments, the minimum radial distance A between the second body 201 and the impeller 3 satisfies 1D / 28≦A≦1D / 10. The radial distance between the second body 201 and the impeller 3 is the gap between the volute tongue 2 and the impeller 3. The ratio of the gap between the volute tongue 2 and the impeller 3 to the diameter of the impeller 3 significantly affects the flow rate and efficiency, and also has some effect on the pressure in the through-flow air duct. If the gap is large, the fan pressure drops and the flow rate decreases. If the gap is small, the pressure increases and the flow rate increases, but the peak noise level and sound quality deteriorate, which also affects the assembly of the through-flow air duct and safety regulations for the impeller 3. Therefore, in this embodiment, by limiting the minimum radial distance between the second body 201 and the impeller 3, a certain level of pressure and flow rate can be ensured while avoiding increased noise and an impact on sound quality.

[0051] Based on the above-described embodiments, in some embodiments, the volute throat 105 is located at the position where the distance between the first body 101 and the impeller 3 is shortest, and the distance between the volute throat 105 and the impeller 3 is B, where 1D / 22≦B≦1D / 11. As the distance between the impeller 3 and the volute 1 increases, the air volume decreases and the vortex area on the first side of the volute 1 gradually increases, resulting in increased noise due to turbulent air guiding. On the other hand, if the distance between the volute throat 105 and the impeller 3 is too small, the unevenness of the air speed and pressure of the internal airflow of the impeller 3 increases, the pulsation force around the volute 1 increases, and rotation noise increases. Therefore, in this embodiment, by limiting the distance between the volute throat 105 and the impeller 3, it is possible to ensure uniformity of the internal air speed and pressure of the impeller 3 and reduce noise.

[0052] Based on the above-described embodiment, in some embodiments, the radial distance between the airflow grid 4 and the impeller 3 is F, where 1D / 6≦F≦1D / 3. If the distance between the airflow grid 4 and the impeller 3 is too short, pressure pulsation at the air duct outlet becomes severe, resulting in increased broadband noise in the fluid field. Furthermore, if the outlet gap is too small, the fluid flow in the fluid field becomes uneven, resulting in loss of air volume and a decrease in outlet wind speed. Therefore, in this embodiment, by limiting the radial distance between the airflow grid 4 and the impeller 3, it is possible to prevent increased noise at the air duct outlet, reduce loss of air volume, and ensure a high outlet wind speed.

[0053] Based on the above-described embodiments, in some embodiments, as shown in Fig. 2, the impeller 3 includes a plurality of impeller segments 301, and the distance between two adjacent first grid segments 401 or two adjacent second grid segments 402, or between two adjacent first baffle plates 102 or two adjacent second baffle plates 202 is the length of N impeller segments 301, where 1 < N < 3.

[0054] The distance between two adjacent first grid segments 401 is the height of the second grid segment 402, and the distance between two adjacent second grid segments 402 is the height of the first grid segment 401. In this embodiment, the heights of the first grid segment 401 and the second grid segment 402 are limited, i.e., the grid discrete displacement frequency is limited. The through-flow air duct forms a vortex within the fluid field of the impeller 3 through the action of the volute 1 and the volute tongue 2. When the vortex deviates from the center of the blade rotation axis, through-flow occurs. If the heights of the first grid segment 401 and the second grid segment 402 are too small, the discrete frequency of the outlet fluid field increases, affecting the internal wind pressure of the air duct. The eccentric vortex position of a single segment is unstable, preventing the formation of a stable through-flow area within the blade. This disrupts the fluid field between adjacent segments, significantly affecting the noise, sound quality, outlet air velocity, and flow rate of the entire device. If the heights of the first grid segment 401 and the second grid segment 402 are too large, the displacement width of the fluid field will increase, and the airflow sent out by the displaced adjacent air duct segments will not converge at a distant location, resulting in a sense of obvious left-right deviation in the airflow, which will affect the user experience. Therefore, in this embodiment, the heights of the first grid segment 401 and the second grid segment 402 are limited to ensure that a stable through-flow area is formed inside the blades, and the left-right airflow speed is uniform without affecting the noise, sound quality, outlet airflow speed, and flow rate of the entire device.

[0055] <Example 2> The present invention provides a blower, specifically a fan structure, which may be a blower such as an air conditioner or a cooler, and includes the cross-flow air duct according to the above-described embodiment.

[0056] Obviously, the above examples are merely examples given for clarity of explanation and are not intended to limit the embodiments. Those skilled in the art can obtain other variations and modifications based on the above description. It is not possible or necessary to list all the embodiments here. Any obvious variations and modifications that can be expanded from the description herein fall within the scope of protection of the present invention. [Explanation of symbols]

[0057] 1. Volute 101, First Body 102, first air guide plate 1021, first board body 1022, first wind guide surface 103, second wind guide surface 104. Third air guide plate 105, volute throat 2. Volute tongue 201, the second body 202, second air guide plate 2021, 2nd board body 2022, 3rd wind guidance surface 203, 4th wind guide surface 204, intake air guide surface 3. Impeller 301, impeller segment 4. Ventilation grid 401, 1st grid segment 4011, first centrosymmetric plane 402, second grid segment 4021, second centrosymmetric plane 5. Dislocation reference plane 6, front page 7, second side

Claims

1. A once-through air duct comprising a volute (1) and a volute tongue (2), The volute (1) comprises a first body (101), a first side of the first body (101) is an intake side, and a second side of the first body (101) is an air blowing side; The volute tongue (2) is disposed apart from the volute (1), and the volute tongue (2) comprises a second body (201), a first side of the second body (201) is an intake side, and a second side of the second body (201) is a blowing side, and an attachment space for attaching an impeller (3) is formed between the first body (101) and the second body (201), an intake port extending along the axial direction of the volute (1) is formed between the first side of the first body (101) and the first side of the second body (201), and a plurality of blowing ports arranged along the axial direction of the volute (1) are formed between the second side of the first body (101) and the second side of the second body (201), The plurality of air outlets include a plurality of first air outlets and a plurality of second air outlets, and the first air outlets and the second air outlets are alternately arranged so as to be spaced apart along the axial direction of the volute (1). A flow-through air duct characterized by:

2. A plurality of first air guide plates (102) are provided on a second side of the first body (101) and are spaced apart along the axial direction of the volute (1), and the first air blowing opening is formed between the first air guide plates (102) and the second body (201); A second side of the second body (201) is provided with a plurality of second air guide plates (202) spaced apart along the axial direction of the volute (1), and the second air flow opening is formed between the second air guide plates (202) and the first body (101), and the first air guide plates (102) and the second air guide plates (202) are alternately arranged along the axial direction of the volute (1).

2. The once-through air duct of claim 1.

3. The first air guide plate (102) comprises a first plate body (1021) and a first air guide surface (1022) provided at an end of the first plate body (1021) and extending to the outside of the installation space; A second air guide surface (103) extending outside the mounting space is provided on a second side of the first body (101), The second air guide plate (202) comprises a second plate body (2021) and a third air guide surface (2022) provided at an end of the second plate body (2021) and extending to the outside of the installation space; A fourth air guide surface (203) extending outside the mounting space is provided on the second side of the second body (201).

3. A once-through air duct according to claim 2.

4. The central symmetric plane between the third airflow guiding surface (2022) and the second airflow guiding surface (103) is defined as a first surface (6), the central symmetric plane between the first airflow guiding surface (1022) and the fourth airflow guiding surface (203) is defined as a second surface (7), and the included angle between the first surface (6) and the second surface (7) is θ, where 0<θ≦40°.

4. A once-through air duct according to claim 3.

5. The central symmetry plane between the second side of the first body (101) and the second side of the second body (201) is defined as a dislocation reference plane (5), the first surface (6) and the second surface (7) are located on both sides of the dislocation reference plane (5), the included angle between the first surface (6) and the dislocation reference plane (5) is θ1, and the included angle between the second surface (7) and the dislocation reference plane (5) is θ2; Here, 0<θ1≦20° and / or 0<θ2≦20°.

5. A once-through air duct according to claim 4.

6. A plurality of third air guide plates (104) are provided on a first side of the first body (101) and are spaced apart along the axial direction of the volute (1).

3. A once-through air duct according to claim 2.

7. The second body (201) has an intake air guide surface (204) on the first side thereof.

3. A once-through air duct according to claim 2.

8. Further provided is a ventilation grid (4) provided at the ventilation port, The air supply grid (4) includes first grid segments (401) and second grid segments (402) that are alternately arranged along the axial direction of the volute (1), and a plurality of the first grid segments (401) and a plurality of the second grid segments (402) are provided, The first grid segment (401) is provided to correspond to the second air outlet, and the second grid segment (402) is provided to correspond to the first air outlet.

8. A once-through air duct according to any one of claims 1 to 7.

9. The central symmetry plane of the first grid segment (401) parallel to the axis of the volute (1) is defined as a first central symmetry plane (4011), and the central symmetry plane of the second grid segment (402) parallel to the axis of the volute (1) is defined as a second central symmetry plane (4021), and the included angle between the first central symmetry plane (4011) and the second central symmetry plane (4021) is β, where 0<β≦50°.

9. A once-through air duct according to claim 8.

10. The central symmetry plane between the second side of the first body (101) and the second side of the second body (201) is defined as a dislocation reference plane (5), the included angle between the first central symmetry plane (4011) and the dislocation reference plane (5) is β1, and the included angle between the second central symmetry plane (4021) and the dislocation reference plane (5) is β2; Here, 0<β1≦25° and / or 0<β2≦25°.

10. A once-through air duct according to claim 9.

11. The cross section of the second body (201) is an arc, and the axis of the second body (201) and the axis of the impeller (3) are on the same line.

8. A once-through air duct according to any one of claims 1 to 7.

12. The minimum radial distance between the second body (201) and the impeller (3) is A, the diameter of the impeller (3) is D, and 1D / 28≦A≦1D / 10.

12. A once-through air duct according to claim 11.

13. The position where the distance between the first body (101) and the impeller (3) is smallest is the volute throat (105), the distance between the volute throat (105) and the impeller (3) is B, the diameter of the impeller (3) is D, and 1D / 22≦B≦1D / 11.

8. A once-through air duct according to any one of claims 1 to 7.

14. The radial length of the first grid segment (401) and / or the second grid segment (402) is C, the diameter of the impeller (3) is D, and 1D / 9≦C≦1D / 4.

9. A once-through air duct according to claim 8.

15. The radial distance between the airflow grid (4) and the impeller (3) is F, the diameter of the impeller (3) is D, and 1D / 6≦F≦1D / 3.

9. A once-through air duct according to claim 8.

16. The impeller (3) includes a plurality of impeller segments (301), and the distance between two adjacent first baffle plates (102), or two adjacent second baffle plates (202), or two adjacent first grid segments (401), or two adjacent second grid segments (402) is the length of N impeller segments (301) in the axial direction of the volute (1), where 1≦N≦3.

9. A once-through air duct according to claim 8.

17. Equipped with a flow-through air duct according to any one of claims 1 to 7 A blower device characterized by:

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