Air inlet assembly, drying device and cleaning equipment comprising drying device

Abstract

The invention discloses an air inlet assembly, a drying device and cleaning equipment comprising the drying device. The air inlet assembly comprises a plurality of static guide blades, the static guide blades are arranged around the axis of the air inlet assembly, all the static guide blades are twisted relative to the plane perpendicular to the axis, the side, in the inward direction of the axis, of each static guide blade is a first side edge, and the side, in the outward direction, of each static guide blade is a second side edge. The side, close to the axis, of the static guide blade is a blade tip, the side, away from the axis, of the static guide blade is a blade root, a hollow area is formed between the blade tips, the position, close to the blade tips, of the first side edge comprises a pre-swirling section, and the projection of the pre-swirling section along the axis is an inwards-sunken continuous curve. And at least part of the projection of each pre-rotation section along the axis is covered by the projection of the second side edge of the adjacent static guide blade along the axis. According to the invention, the flow of hot air in unit time is increased, and meanwhile, the pre-swirling effect of air flow is ensured. Meanwhile, the speed is continuous when airflow passes through the front edge, pressure pulsation is reduced, and aerodynamic noise is reduced.

Description

Technical Field

[0001] The invention relates to an air inlet assembly, a drying device and cleaning equipment comprising the same. Background Art

[0002] In existing cleaning equipment, such as dishwashers, after the washing process is completed, the fan will start to inhale air. After being heated by the heating device, the hot air is transported to the inner tank of the dishwasher through the air duct to dry items such as tableware. In existing drying devices, the shape of the air inlet is a hexagonal grid structure. The hot air enters the inner tank of the dishwasher through this structure, which easily forms a direct blowing effect, and the drying effect is not good. The other is an axial flow blade structure with a hub. After the hot air passes through this structure, although the pre-rotation effect is achieved, due to the presence of the hub, part of the hot air is blocked, reducing the amount of air passing through, affecting the drying efficiency. At the same time, hot air at a certain wind speed impacting the hub will cause impact loss and high noise. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of low drying efficiency and high noise of the air inlet in the prior art.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] An air inlet assembly, the air inlet assembly includes a plurality of relatively fixed static guide blades, the static guide blades are arranged around the axis of the air inlet assembly, each of the static guide blades is twisted relative to a plane perpendicular to the axis, the static guide blade has a first side on the side in the inward direction of the axis and a second side on the side in the outward direction of the axis, the side of the static guide blade close to the axis is a blade tip and the side away from the axis is a blade root, a hollow area is formed between the blade tips, the first side near the blade tip includes a pre-swirl section, the projection of the pre-swirl section along the axis is a continuous curve concave inwardly, and at least a portion of the projection of each pre-swirl section along the axis is covered by the projection of the second side of an adjacent static guide blade along the axis.

[0006] In this solution, since there is no hub structure in the hollow area of ​​the static guide blade, air can also enter the middle part of the air inlet, which increases the flow rate of airflow per unit time and greatly improves the drying efficiency of the whole machine. However, since there is no hub structure in the hollow area of ​​the static guide blade, the closer the airflow is to the leading edge of the static guide blade, the worse the pre-swirl effect is, and it will cause airflow separation and form vortices. At the same time, the airflow speed in the middle part is high, and the impact loss on the leading edge of the static guide blade is also large, which will cause pressure pulsation at the leading edge and generate aerodynamic noise.

[0007] In this solution, the front edge streamline of the static guide vane is smooth and gentle through the provision of the pre-swirl section. At the same time, the airflow has a continuous speed and a continuous force when passing through the front edge. And when the wind enters, it is at least partially blocked by the first side and moves along the front edge of the static guide vane and then flows to the pre-swirl section. When the airflow moves along the front edge, the pre-swirl effect is good, the airflow is not easy to separate, and the impact loss is reduced. At the same time, the pressure pulsation at the leading edge of the blade is reduced, so that the aerodynamic noise is reduced. Therefore, while the air intake efficiency is improved and the noise is reduced overall, it can also avoid increasing the airflow separation and pressure pulsation.

[0008] Preferably, the first side also includes a transition section connected to the pre-spin section, the transition section is a continuous curve, and the continuous curve of the transition section and the continuous curve of the pre-spin section are smoothly connected. The transition section can connect the transition with the pre-spin section, and the transition section in the form of a continuous curve can achieve a smoother transition, reducing airflow separation and energy loss generated by the airflow in the transition section.

[0009] Preferably, the continuous curve of the transition section is tangent to the continuous curve of the pre-rotation section, and / or the continuous curve of the transition section is a convex arc. The arc design is relatively simple, which is conducive to the transition with the pre-rotation section. At the same time, the convex arc can smoothly guide the lines that smoothly transition from the concave pre-rotation section to other parts of the subsequent first side, thereby ensuring the continuity and smoothness of the extension of the first side, further achieving smooth transition, and reducing the airflow separation and energy loss generated by the airflow in the transition section.

[0010] Preferably, the continuous curve of the pre-swirl section is one or a combination of elliptical arcs, circular arcs, and spline curves. When the airflow passes through the pre-swirl section, it will be pre-swirled along the side, thereby improving the pre-swirl effect of the intermediate airflow. At the same time, when the airflow impacts the pre-swirl section, the airflow will be dispersed along the side, the impact on the leading edge is buffered, and the impact loss is reduced.

[0011] Preferably, the axis passes through the center of the hollow area, the continuous curve of the pre-swirl section is an elliptical arc, and the continuous curve of the blade tip is a circular arc, wherein a first angle is formed between a line connecting the center of the elliptical arc and the center of the hollow area, and a line connecting the center of the circular arc of the blade tip and the center of the hollow area, and a second angle is obtained by dividing 360 degrees by the number of the static guide vanes, and the first angle and the second angle are complementary to each other. In this way, the distance between the multiple static guide vanes and at least partial coverage of the pre-swirl section by the second side can be ensured.

[0012] Preferably, the air inlet assembly includes a base circle with the center of the hollow area as the center and tangent to each of the blade tips, the radius of the arc of the blade tip is 0.5-1 times the radius of the base circle, the major axis of the elliptical arc of the pre-rotation section is 3-3.3 times the radius of the base circle, and the minor axis of the elliptical arc of the pre-rotation section is 1-1.3 times the radius of the base circle. The range of the major and minor axes directly affects the curvature of the ellipse, and the curvature of this arc is important and critical. The significance of its reasonable range is that when the intermediate airflow passes through the arc, it can better ensure the pre-rotation effect of the intermediate airflow and reduce the impact loss. At the same time, it also avoids the pre-rotation effect caused by the large area of ​​the hollow area, and the impact loss and excessive morning caused by the small area.

[0013] Preferably, the tail section of the first side edge connected to the blade root is a continuous line, and / or the second side edge is a continuous line.

[0014] Preferably, the continuous lines of the tail section and the second side are one or a combination of spline curves, Bezier curves, and straight lines. These continuous lines can be designed without parameters and can be matched with the front edge, which can reduce the design difficulty and flexibly adapt to various situations.

[0015] Preferably, the continuous curve of the pre-swirl section is an elliptical arc, and the elliptical arc of the pre-swirl section is connected with the convex circular arc. The elliptical arc can better make the airflow pre-swirl, reduce impact loss, and the connection between the elliptical arc and the circular arc can be very smooth, reducing the loss and separation of the airflow here.

[0016] Preferably, the air inlet assembly further comprises a peripheral component, a hollow air inlet passage is formed in the middle of the peripheral component, each of the static guide vanes is located in the air inlet passage, and the blade root is fixed to the peripheral component.

[0017] A drying device comprises a pipeline component and an air inlet assembly, wherein the pipeline component has an air inlet, the air inlet assembly covers the air inlet, and the air inlet assembly is connected to the pipeline component.

[0018] A cleaning device comprises the air inlet assembly.

[0019] The positive and progressive effects of the present invention are: the present invention eliminates the hub structure, so that the flow rate of hot air passing through per unit time is increased, while ensuring the pre-swirl effect of the airflow and improving efficiency. By using the curve design principle, the leading edge streamline of the static guide vane is smooth and gentle. At the same time, the speed of the airflow passing through the leading edge is continuous, and the force is also continuous. Therefore, when the airflow moves along the leading edge, it is not easy to separate, and the impact loss is reduced. The pressure pulsation of the leading edge of the static guide vane is reduced, so that the aerodynamic noise is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the air inlet assembly of a preferred embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the front structural view of the air inlet assembly of a preferred embodiment of the present invention.

[0022] Figure 3 It is a schematic diagram of the partial structure of the air inlet assembly of a preferred embodiment of the present invention.

[0023] Figure 4 It is a schematic diagram of the front structural view of the static guide vane of a preferred embodiment of the present invention.

[0024] Figure 5 Schematic diagram of the design of the static guide vane of a preferred embodiment of the present invention.

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of a drying device according to a preferred embodiment of the present invention.

[0026] Figure 7 This is a velocity cloud diagram from a three-dimensional perspective during the experiment of the air inlet assembly of the preferred embodiment of the present invention.

[0027] Figure 8 It is a velocity cloud diagram of the air inlet assembly during the experiment of the preferred embodiment of the present invention.

[0028] Fig. 9 The velocity cloud diagram during the air inlet component experiment for reference comparison.

[0029] Fig.10 This is a vortex cloud diagram of the air inlet assembly during the experiment of the preferred embodiment of the present invention.

[0030] Fig.11 The vortex cloud diagram during the air inlet component experiment for reference comparison.

[0031] Description of Reference Numerals

[0032] Static guide vane 100

[0033] Leading Edge 101

[0034] The first side 110

[0035] Pre-spin section 111

[0036] Transition Section 112

[0037] End 113

[0038] The second side 120

[0039] Tip 130

[0040] Leaf root 140

[0041] Hollow area 200

[0042] Peripheral components 300

[0043] Pipeline Components 400

[0044] Fan 500 DETAILED DESCRIPTION

[0045] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0046] like Figure 1-Figure 5 As shown, this embodiment discloses an air inlet assembly, wherein, as Figure 1 and Figure 2 As shown, the air inlet assembly includes a plurality of relatively fixed static guide blades 100, which are arranged around the axis L of the air inlet assembly, and each static guide blade 100 is twisted relative to a plane perpendicular to the axis L. The side of the static guide blade 100 inwardly of the axis L is a first side 110, and the side inwardly of the axis L is a second side 120, the side of the static guide blade 100 close to the axis L is a blade tip 130, and the side away from the axis L is a blade root 140, wherein, as shown in FIG. Figure 2 and Figure 3 As shown, a hollow area 200 is formed between the blade tips 130, and the position of the first side edge 110 close to the blade tip 130 includes a pre-swirl section 111, and the projection of the pre-swirl section 111 along the axis L ( Figure 2 , Figure 3 , Figure 4 and Figure 5 It can be understood that the projection angle of the axis L in the figure is a continuous curve concave inward, and at least part of the projection of each pre-swirl section 111 along the axis is covered by the projection of the second side 120 of the adjacent static guide vane 100 along the axis.

[0047] In this embodiment, the static guide vane 100 itself is a stationary blade, that is, it does not rotate. The static guide vane 100 can be fixed in a known fixed blade fixing manner, mainly by fixing the end of the blade root 140 to a relatively fixed structure. The static guide vane 100 is twisted relative to a plane perpendicular to the axis L, that is, the static guide vane 100 is not parallel to the plane perpendicular to the axis L. Figure 2 and Figure 3 In the figure, the inward direction perpendicular to the plane where the drawing is located is the inward direction of the axis L, and the outward direction perpendicular to the plane where the drawing is located is the outward direction of the axis L. In most cases, the direction of the axis L can be parallel to the expected direction of the incoming wind.

[0048] The continuous curve in this embodiment refers to a curve without sudden changes during the change process. For example, a sudden spike, a notch, or a sharp turn may occur. The continuous curve may be a continuous curve commonly used in existing blade designs. The continuous curve may be a line segment, or may be a continuous curve formed by splicing several lines. The setting of the continuous curve of the first side edge 110 and the second side edge 120 is determined according to the projection of the static guide vane 100 in the direction of the axis L. Figure 1 In the stereoscopic view or other view, the first side 110 and the second side 120 may have various suitable shapes. Figure 2-Figure 5 What is shown are the leading edge 101 (front surface) of the static guide vane 100. The trailing edge (rear surface) of the static guide vane 100 can be set to various suitable shapes according to the design requirements of the blades in the prior art. The static guide vane 100 in some embodiments can be set to a sheet shape, and the leading edge 101 and the trailing edge can have similar three-dimensional undulating surface shapes.

[0049] In this embodiment, since the hollow area 200 of the static guide blade 100 does not have a hub structure, air can also enter the middle part of the air inlet, which increases the flow rate of airflow passing through per unit time, and greatly improves the drying efficiency of the whole machine. However, since the hollow area 200 of the static guide blade 100 does not have a hub structure, the closer the airflow is to the leading edge 101 of the static guide blade 100, the worse the pre-swirl effect is, and it will cause airflow separation and form vortices. At the same time, the airflow speed in the middle part is high, and the impact loss on the leading edge 101 of the static guide blade 100 is also large, which will cause pressure pulsation of the leading edge 101 and generate aerodynamic noise.

[0050] Therefore, in view of the above problems, in this embodiment, the leading edge 101 of the static guide vane 100 is provided with a pre-swirl section 111 so that the streamlines are smooth and gentle. At the same time, the airflow has a continuous speed and a continuous force when passing through the leading edge 101. And when the wind enters, it is at least partially blocked by the first side 110 and moves along the leading edge 101 of the static guide vane 100 and then flows to the pre-swirl section 111. When the airflow moves along the leading edge 101, the pre-swirl effect is good, the airflow is not easy to separate, and the impact loss is reduced. At the same time, the pressure pulsation of the leading edge 101 of the blade is reduced, so that the aerodynamic noise is reduced. Therefore, while the air intake efficiency is improved and the noise is reduced overall, it can also avoid increasing the airflow separation and pressure pulsation.

[0051] like Figure 4 and Figure 5As shown, in a preferred embodiment, the first side 110 further includes a transition section 112 connected to the pre-spin section 111, and the transition section 112 is a continuous curve, and the continuous curve of the transition section 112 and the continuous curve of the pre-spin section 111 are smoothly connected. The transition section 112 can connect the transition with the pre-spin section 111, and the transition section 112 in the form of a continuous curve can achieve a smoother transition, thereby reducing the airflow separation and energy loss generated by the airflow in the transition section 112.

[0052] like Figure 4 and Figure 5 As shown, in a preferred embodiment, the continuous curve of the transition section 112 is tangent to the continuous curve of the pre-rotation section 111, and / or the continuous curve of the transition section 112 is a convex arc. The arc design is relatively simple, which is conducive to the transition with the pre-rotation section 111. At the same time, the convex arc can smoothly guide the smooth transition from the concave pre-rotation section 111 to the lines of other parts of the subsequent first side 110, thereby ensuring the continuity and smoothness of the extension of the first side 110, further achieving smooth transition, and reducing the airflow separation and energy loss generated by the airflow in the transition section 112.

[0053] like Figure 4 and Figure 5 As shown, in a preferred embodiment, the continuous curve of the pre-swirl section 111 is a combination of one or more of an elliptical arc, a circular arc, and a spline curve. When the airflow passes through the pre-swirl section 111, it will be pre-swirled along the side, thereby improving the pre-swirling effect of the intermediate airflow. At the same time, when the airflow impacts the pre-swirl section 111, the airflow will be dispersed along the side, thereby buffering the impact on the leading edge 101 and reducing the impact loss.

[0054] like Figure 4 and Figure 5 As shown, in a preferred embodiment, the axis L passes through the center of the hollow area 200, the continuous curve of the pre-swirl section 111 is an elliptical arc, and the continuous curve of the blade tip 130 is a circular arc, wherein the line connecting the center of the elliptical arc and the center of the hollow area 200, and the line connecting the center of the elliptical arc and the center of the hollow area 200 form a first angle, and 360 degrees divided by the number of static guide vanes 100 obtains a second angle, and the first angle and the second angle are complementary. In this way, the distance between the multiple static guide vanes 100 and at least partial coverage of the pre-swirl section 111 by the second side 120 can be ensured.

[0055] like Figure 4 and Figure 5As shown, in a preferred embodiment, the air inlet assembly includes a base circle with the center of the hollow area 200 as the center and tangent to each blade tip 130, the radius of the arc of the blade tip 130 is 0.5-1 times the radius of the base circle, the major axis of the elliptical arc of the pre-swirl section 111 is 3-3.3 times the radius of the base circle, and the minor axis of the elliptical arc of the pre-swirl section 111 is 1-1.3 times the radius of the base circle. The range of the major and minor axes directly affects the curvature of the ellipse, and the curvature of this arc is important and critical. The significance of its reasonable range is that when the intermediate airflow passes through the arc, it can better ensure the pre-swirl effect of the intermediate airflow and reduce the impact loss. At the same time, it also avoids the pre-swirl effect of the hollow area 200 due to excessive area, and the impact loss and excessive morning due to too small area.

[0056] like Figure 4 and Figure 5 As shown, in a preferred embodiment, the tail section 113 of the first side 110 connected to the blade root 140 is a continuous line, and / or the second side 120 is a continuous line. Figure 4 and Figure 5 As shown, in a further preferred embodiment, the continuous lines of the tail section 113 and the second side 120 are a combination of one or more of a spline curve, a Bezier curve, and a straight line. These continuous lines can be designed without parameters, and can be matched with the leading edge 101, which can reduce the design difficulty and flexibly adapt to various situations. And these designs are not the key points to solve the technical problems solved by the present invention, so their composition mode and shape can ensure the realization of technical effects as long as they are set in a manner according to generally known technologies. In a further preferred embodiment, the continuous curve of the pre-rotation section 111 is an elliptical arc, and the elliptical arc of the pre-rotation section 111 is connected with the convex circular arc. The elliptical arc can better make the airflow produce pre-rotation, reduce impact loss, and at the same time, the connection with the circular arc can be very smooth, reducing the loss and separation of the airflow here.

[0057] To show the design more clearly, Figure 5 A more parameterized way of designing the static guide vane 100 is shown. Points a, b, c, and d are points for dividing various parts. The line segment from the upper left corner to point a represents the second side 120, the limit between ab represents the blade tip 130, the line segment between bc represents the pre-swirl segment 111, the line segment between cd represents the transition segment 112, and the line segment from point d to the upper right corner represents the tail segment 113. Figure 5E, F, G, and H in the figure respectively represent the center of a circle or the center of an ellipse of different references in the design project. Point E is the center of a base circle centered on the center of the hollow area 200 and tangent to each blade tip 130, and the circular dotted line on its outer circumference represents a base circle centered on the center of the hollow area 200 and tangent to each blade tip 130. Point E may also be passed through by the axis L. Point F is the center of the arc of the blade tip 130. Point G is the center of the ellipse of the ellipse of the pre-swirl section 111. Point H is the center of the arc of the transition section 112. The major axis of the ellipse of the pre-swirl section 111 is m, and the minor axis is n. 360 degrees divided by the number of static guide vanes 100 gives the second angle θ.

[0058] like Figure 5 As shown, for the convenience of design, a rectangular coordinate system is established with point E as the origin, the horizontal axis is X, and the vertical axis is Y. Circle E is the base circle, and the relationship between circle E and circle F is as follows: the radius of circle F is r∈[1,2], then the radius of circle E is R=2r∈[2,4], and R cannot be too large, otherwise it will greatly affect the overall pre-rotation effect. If there are p blades in total, p∈[6,10] and p is an integer. The angle between the line connecting the center of circle E and the center of circle F and the horizontal coordinate axis X is θ, and the coordinate axis X is determined, then θ=(360°) / p. The line EG connecting the center of the elliptical arc and the center of the hollow area 200 is used as the vertical coordinate axis Y, and a first angle is formed between EG and the line EF connecting the center of the arc of the blade tip and the center of the hollow area 200, and the first angle is complementary to the second angle θ. The origin E and the coordinate axes X and Y are thus determined.

[0059] First, make the circle F of all blades maintain a tangent relationship with the circle E. On the basis of satisfying the tangent relationship, the vertical upward radial direction is named the positive direction of Y, and the horizontal rightward radial direction is named the positive direction of X. The positional relationship between the circle F, the ellipse G, the circle H and the center E is as follows: the Y coordinate of the circle F is Y F , the Y coordinate of circle E is Y E , Y F >Y E ;X F <X E ; The center of the ellipse G and the center of the circle E always remain in a straight line in the vertical direction, that is, X G =X E At the same time, the coordinate of the center G in the Y direction is always greater than the center E, that is, Y G >Y E At the same time, Y G ≥Y F >Y E The Y coordinate of the center of circle H is always higher than that of circle F, ellipse G, and circle E. H >Y G ≥Y F >Y E . At the same time X F<X H <X G On the basis of satisfying the above conditions, the relationship between the curves is as follows: the center angle θ∈[160°, 180°] of the arc ab, while ensuring the size of the center angle, confirm the position of the arc, that is, the coordinates of point a and the coordinates of circle F always maintain the following relationship: Xa>X F , Ya≤Y F The coordinate relationship between point b and circle F, circle E, and ellipse G is as follows: F <X b <X E , Y F ≤Y b ≤Y G . The elliptical arc bc maintains a tangent relationship with the arc ab. If the radius of circle F is r, then the minor axis n∈[1r,1.3r] and the major axis m∈[3r,3.3r] of the ellipse G. The range of the major and minor axes directly affects the arc curvature of the ellipse, and this arc curvature is also the most important and critical in the design of this scheme. The significance of its design is to allow the intermediate airflow to pre-swirl along the side when passing through the arc, thereby enhancing the pre-swirl effect of the intermediate airflow. At the same time, when the airflow impacts the side of the arc, the airflow will be dispersed along the side, and the impact on the leading edge is buffered, reducing the impact loss. The central angle θ∈[10°, 20°] of the arc cd, and the radius R of the circle H H The radius relationship between circles F and E must satisfy the following relationship, that is, R F <R H <R E .

[0060] like Figure 1 and Figure 2 As shown, the air inlet assembly further includes a peripheral component 300, a hollow air inlet passage is formed in the middle of the peripheral component 300, each static guide vane 100 is located in the air inlet passage, and the blade root 140 is fixed to the peripheral component 300. Figure 6 As shown, this embodiment also discloses a drying device, which includes a duct component 400 and an air inlet assembly, wherein the duct component 400 has an air inlet, the air inlet assembly covers the air inlet, and the air inlet assembly is connected to the duct component 400. A fan 500 is provided at one end of the duct component 400 for exhausting air. The air inlet assembly of each of the above embodiments can be used in cleaning equipment, such as a dishwasher. The cleaning equipment is provided with an air inlet assembly at the drying device or other air inlet position, and the absorbed air flows through the air inlet assembly into the inner tank for drying or other purposes.

[0061] like Figure 7-Figure 9 As shown, in order to better demonstrate the effect of the above implementation, a control experiment was conducted and a velocity cloud diagram was displayed. Figure 7 and Figure 8According to the embodiments of the present invention, the hollow pre-swirl section is used. Fig. 9 It is a solution in which only a hollow portion is provided (the hub is eliminated) but no pre-swirl section is provided.

[0062] The air inlet assembly is located in Figure 7-9 The upper left end is the inlet, and the lower right end is the outlet. Figure 7 It clearly shows the process of airflow rotating inside the air inlet assembly after passing through it. Figure 7 This shows how the air flows to various locations inside the dishwasher. Different colors are used to represent the flow speed. The flow speed is higher at the inlet on the upper left, and lower at the outlet.

[0063] Figure 8 and Fig. 9 The pre-spin segment ( Figure 8 ) and without pre-spin section ( Fig. 9 ) is a schematic diagram showing the speed cloud diagram of the scheme. Figure 8 and Fig. 9 While different colors are used to represent flow velocity, the envelope of the gradient line is also used to represent the velocity gradient (magnitude) in different areas. Figure 8 The gradient line from the upper left end of the air inlet component has a relatively large and continuous coverage, which can be seen from the basic coverage Figure 8 The upper left quarter of the figure. This is because the setting of the pre-swirl section makes the airflow rotate so that it will not decay too quickly and spread more. Fig. 9 In the case of not using the pre-swirl section and only not setting the hub, the gradient line disappears quickly after the air inlet assembly comes in. And there is basically no continuous gradient line above the center line of the air inlet assembly. The gradient line in the upper right corner shows that the flow rate here is even lower than other parts. Therefore Figure 8 and Fig. 9 The gradient line can clearly show the flow velocity of the airflow, so that Figure 8 The airflow pre-swirl effect is significantly better than Fig. 9 The situation.

[0064] Fig.10 and Fig.11 The pre-spin segment ( Fig.10 ) and without pre-spin section ( Fig.11 ) scheme. Different colors are used to represent the size of the vorticity. Red, yellow, green, and blue represent the vorticity from large to small. It can be seen that the pre-swirl section ( Fig.10 ) scheme, the red area with larger vorticity is smaller, and the coverage of yellow and green areas is also smaller. Fig.11 ) indicates that the area with larger vorticity is larger, and the yellow and green areas cover a larger area, and are also distributed more in the blade root area. From the distribution of vorticity, it can be seen that the pre-swirl section ( Fig.10 ) is subject to a smaller vortex, which reflects that the corresponding pressure pulsation is smaller.

[0065] In summary, the present invention eliminates the hub structure, thereby increasing the flow rate of hot air passing through per unit time, while ensuring the pre-swirl effect of the airflow and improving efficiency. By using the curve design principle, the streamline of the leading edge 101 of the static guide vane 100 is smooth and gentle. At the same time, the speed of the airflow passing through the leading edge 101 is continuous, and the force is also continuous. Therefore, when the airflow moves along the leading edge 101, it is not easy to separate, and the impact loss is reduced. The pressure pulsation of the leading edge 101 of the static guide vane 100 is reduced, so that the aerodynamic noise is reduced.

[0066] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. An air inlet assembly, characterized in that: The air inlet assembly includes a plurality of relatively fixed static guide blades, the static guide blades are arranged around the axis of the air inlet assembly, each of the static guide blades is twisted relative to a plane perpendicular to the axis, the static guide blade has a first side on the side inward of the axis and a second side on the side outward of the axis, the side of the static guide blade close to the axis is a blade tip and the side away from the axis is a blade root, a hollow area is formed between the blade tips, the first side close to the blade tip includes a pre-swirl section, the projection of the pre-swirl section along the axis is a continuous curve concave inwardly, and at least a portion of the projection of each pre-swirl section along the axis is covered by the projection of the second side of an adjacent static guide blade along the axis.

2. The air inlet assembly according to claim 1, characterized in that: The first side also includes a transition section connected to the pre-rotation section, the transition section is a continuous curve, and the continuous curve of the transition section and the continuous curve of the pre-rotation section are smoothly connected.

3. The air inlet assembly according to claim 2, characterized in that: The continuous curve of the transition section is tangent to the continuous curve of the pre-rotation section, and / or the continuous curve of the transition section is an outwardly convex arc.

4. The air inlet assembly according to claim 1, characterized in that: The continuous curve of the pre-rotation segment is one or a combination of multiple elliptical arcs, circular arcs and spline curves.

5. The air inlet assembly according to claim 1, characterized in that: The axis passes through the center of the hollow area, the continuous curve of the pre-rotation segment is an elliptical arc, and the continuous curve of the blade tip is a circular arc, wherein a first angle is formed between a line connecting the center of the elliptical arc and the center of the hollow area, and a line connecting the center of the circular arc of the blade tip and the center of the hollow area, and a second angle is obtained by dividing 360 degrees by the number of the static guide vanes, and the first angle and the second angle are complementary to each other.

6. The air inlet assembly according to claim 5, characterized in that: The air inlet assembly includes a base circle with the center of the hollow area as the center and tangent to each of the blade tips, the radius of the arc of the blade tip is 0.5-1 times the radius of the base circle, the major axis of the elliptical arc of the pre-rotation segment is 3-3.3 times the radius of the base circle, and the minor axis of the elliptical arc of the pre-rotation segment is 1-1.3 times the radius of the base circle.

7. The air inlet assembly according to claim 1, characterized in that: The tail section of the first side edge connected to the blade root is a continuous line, and / or the second side edge is a continuous line.

8. The air inlet assembly according to claim 7, characterized in that: The continuous lines of the tail segment and the second side edge are one or a combination of a spline curve, a Bezier curve, and a straight line.

9. The air inlet assembly according to claim 7, characterized in that: The elliptical arc of the pre-rotation section is connected with the convex circular arc.

10. The air inlet assembly according to claim 7, characterized in that: The air inlet assembly also includes a peripheral component, a hollow air inlet passage is formed in the middle of the peripheral component, each of the static guide vanes is located in the air inlet passage, and the blade root is fixed to the peripheral component.

11. A drying device, characterized in that: The drying device comprises a pipe component and an air inlet assembly as described in any one of claims 1 to 10, the pipe component has an air inlet, the air inlet assembly covers the air inlet, and the air inlet assembly is connected to the pipe component.

12. A cleaning device, characterized in that: The cleaning device comprises an air inlet assembly as described in any one of claims 1-10.

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