Diffusers, blowers and dust collection equipment

Abstract

To provide a diffuser reduced in the flow loss.SOLUTION: A diffuser comprises a base ring component and multiple stationary blades. The multiple stationary blades are placed in multiple rows along an axial direction of the base ring component in sequence. Each stationary blade raw has multiple stationary blades. The multiple stationary blades in each stationary blade raw are placed along a circumferential direction of the base ring component. A cross section of the base ring component is circular. Profiles of each of the stationary blades in at least one of the multiple stationary blade rows are placed to be inclined toward one side of the stationary blade.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] This application claims priority from a Chinese patent application with application number 202010010952.7 and title "Diffuser, Blower and Vacuum Cleaner" filed with the China Patent Office on January 6, 2020. Priority of a Chinese patent application with application number 202010010950.8 and title "Diffuser, Blower and Vacuum Cleaner" filed with the China Patent Office on January 6, 2020; The company claims priority to a Chinese patent application with application number 202010011558.5 and title "Diffuser, Blower and Vacuum Cleaner" filed with the China Patent Office on January 6, 2020. The contents of all three above mentioned Chinese patent applications are incorporated herein by reference.

[0002] The present application relates to the technical field of cleaning equipment, and in particular to diffusers, blowers and dust collection equipment. [Background technology]

[0003] A blower is generally installed in the dust collection equipment, and a diffuser is installed in the blower to convert the kinetic energy of the airflow passing through the blower into pressure energy and further reduce the flow loss of the airflow. A stationary vane is generally installed in the diffuser to perform drainage and pressure boosting of the airflow.

[0004] However, the layout method of the traditional stator vane still cannot fully realize the conversion between kinetic energy and pressure energy when the airflow flows through the diffuser, thus resulting in large flow loss generated when the airflow flows through the diffuser. Summary of the Invention [Problem to be solved by the invention]

[0005] The present embodiment provides a diffuser and aims to solve the technical problem in the prior art that the airflow has a large flow loss when it flows through the diffuser. [Means for solving the problem]

[0006] To achieve the above objectives, the technical solutions adopted in this application are as follows:

[0007] In a first aspect, a diffuser is provided, comprising a base ring component and a plurality of rows of stator vanes, the stator vanes of each row are sequentially installed on an outer annular wall of the base ring component along an axial direction of the base ring component, and are all arranged along a circumferential direction of the base ring component, opposite sides of the base ring component along the axial direction are an intake side and an exhaust side, respectively, and from the intake side to the exhaust side, a chord length of the stator vanes of one row is equal to or greater than a chord length of the stator vanes of a next row adjacent to the stator vanes of the row, The stator vanes have an angle of incidence, and from the intake side to the exhaust side, the angle of incidence of the stator vanes in one row is equal to or less than the angle of incidence of the stator vanes in the next row adjacent to the stator vanes in that row.

[0008] In a second aspect, a diffuser is provided, comprising a base ring component and a plurality of stator vanes, the plurality of stator vanes being arranged in a plurality of rows in sequence along an axial direction of the base ring component, the number of the stator vanes in each row of stator vanes being plural, the plurality of the stator vanes in each row of stator vanes being arranged along a circumferential direction of the base ring component, a cross section of the base ring component being circular, and a die surface of each of the stator vanes in at least one row of stator vanes in the plurality of rows of stator vanes being arranged so as to be inclined towards one side of the stator vane.

[0009] In a third aspect, a diffuser is provided, comprising a base ring component and a plurality of stator vanes, the plurality of stator vanes being arranged in a plurality of rows in sequence along an axial direction of the base ring component, the number of the stator vanes in each row of stator vanes being plural, the plurality of the stator vanes in each row of stator vanes being arranged along a circumferential direction of the base ring component, a cross section of the base ring component being circular, and a thickness of each of the stator vanes in at least one row of stator vanes in the plurality of rows of stator vanes being arranged non-constantly from a head to a tail of the stator vane.

[0010] In a fourth aspect, a blower device is provided, comprising the diffuser described above.

[0011] In a fifth aspect, a dust collection system is provided, comprising the blower device described above. Effect of the Invention

[0012] This embodiment has at least the following beneficial effects: The diffuser provided by this embodiment has multiple rows of stator vanes installed in the diffuser along the axial direction of the base ring part, so that the airflow flowing through the diffuser can obtain the multi-stage drainage action of each row of stator vanes, thus realizing multi-stage deceleration supercharging of the airflow, thereby reducing the flow loss generated when the airflow flows through the diffuser.

[0013] The blower provided in this embodiment includes the diffuser, which can ensure that the deceleration supercharging can be smoothly realized under the premise that the airflow does not generate a large flow loss when passing through the diffuser, thus improving the overall working efficiency of the blower and saving the working energy consumption of the blower.

[0014] The dust collection equipment provided in this embodiment includes the above-mentioned blower device, which can smoothly decelerate and increase the pressure of the airflow, and is energy-saving and environmentally friendly during operation, thus significantly improving the dust collection effect of the dust collection equipment including the above-mentioned blower device, and at the same time saving the operating energy consumption of the dust collection equipment. [Brief description of the drawings]

[0015] In order to more clearly describe the technical solutions in the embodiments of the present application, the following briefly introduces drawings necessary for describing the embodiments or exemplary technologies. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

[0016] [Figure 1] FIG. 1 is a structural schematic diagram of the blower device provided in this embodiment. [Diagram 2] FIG. 2 is a structural schematic diagram of a diffuser of the blower device provided in this embodiment. [Diagram 3] FIG. 3 is a cascade diagram of the first row of stator vanes of the diffuser of the blower provided by this embodiment. [Figure 4] FIG. 4 is a blade cascade diagram of the first and second row stator vanes of the diffuser of the blower provided by this embodiment. [Diagram 5] FIG. 5 is a structural schematic diagram of a base ring part of a diffuser of a blower provided in this embodiment. [Figure 6] FIG. 6 is a schematic diagram of the three-dimensional structure of a diffuser provided in an embodiment of the present application. [Figure 7] FIG. 7 is a schematic plan view of the diffuser blade rows of FIG. [Figure 8] FIG. 8 is a schematic front view of the diffuser of FIG. [Figure 9] FIG. 9 is a schematic plan view of the base ring part and the second row stator vane in the diffuser of FIG. [Figure 10] FIG. 10 is a schematic diagram of the bottom structure of the base ring part and the second row stator vane in the diffuser of FIG. [Figure 11] FIG. 11 is a schematic cross-sectional view taken along line AA in FIG. [Figure 12] FIG. 12 is a schematic cross-sectional view of a base ring part and a base ring part of a row of stator vanes in a diffuser according to an embodiment of the present application, taken along a radial surface. [Figure 13]FIG. 13 is a schematic diagram of one stator vane in a diffuser according to an embodiment of the present application, taken on a meridional projection plane. [Figure 14] FIG. 14 is a schematic diagram of the three-dimensional structure of a diffuser provided in an embodiment of the present application. [Figure 15] FIG. 15 is a schematic cross-sectional view of a first blower device according to an embodiment of the present application. [Figure 16] FIG. 16 is a schematic cross-sectional view of a second blower device according to an embodiment of the present application. [Explanation of symbols]

[0017] 10-diffuser, 11-base ring part, 12-first row stator vane, 13—second row stator vane, 14—pressure surface, 15—flow passage, 16-tip, 17-root, 18-mold surface, 19 - suction surface, 20 - blower device, 21 - wind cover, 22 - drive mechanism, 23 - movable impeller, 24 - intake port, 111-outer ring wall, 112-inner ring wall, 113-mounting hole, 114 - stator blade, 221 - frame, 222 - motor, 223 - circuit board, 224 - drive shaft, 225 - bearings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, in which the same or similar reference numerals throughout indicate the same or similar parts or parts having the same or similar functions. The embodiments described below with reference to drawings 1 to 16 are illustrative and are for explaining the present application, and should not be understood as limiting the present application.

[0019] In the description of this application, it should be understood that the indicated orientations or positional relationships of the terms "length", "width", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the drawings, and are only for ease of explanation and simplicity of description of this application, and do not indicate or imply that a specified device or element must have a particular orientation, be configured and operated in a particular orientation, and should not be understood as limiting this application.

[0020] Moreover, the terms "first" and "second" are used merely for descriptive purposes and should not be understood to indicate or imply the relative importance or quantity of the indicated technical features. Thus, a feature qualified with "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise clearly and specifically limited, "plurality" means two or more.

[0021] In the description of the present application, it should be explained that unless otherwise clearly specified and limited, the terms "attached", "coupled", "connected" and "fixed" should be understood in a broad sense, for example, may be a fixed connection, a removable connection, or an integral connection; may be a mechanical connection, or an electrical connection; may be a direct connection, an indirect connection via an intermediate medium, or an internal communication between two elements or an interaction relationship between two elements. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific situation.

[0022] Example 1 As shown in Figures 1, 2 and 4, this embodiment provides a diffuser 10, which is used in a blower 20, and the blower 20 is used in but not limited to dust collection equipment. Here, as shown in Figure 5, the diffuser 10 includes a base ring part 11 and several rows of stator vanes 114, each row of stator vanes 114 is sequentially installed on the outer annular wall 111 of the base ring part 11 along the axial direction of the base ring part 11, and all are arranged along the circumferential direction of the base ring part 11, the opposite sides of the base ring part 11 along the axial direction are the intake side and the exhaust side, and the base ring part 11 has an outer annular wall 111 and an inner annular wall 112, and several mounting holes 113 are opened in the inner annular wall 112, and the base ring part 11 is fixedly connected in the diffuser 10 by drilling the mounting holes 113 and the frame 221 with a lock bolt. From the intake side to the exhaust side, the chord length of the stator vanes 114 in one row is equal to or greater than the chord length of the stator vanes 114 in the next row adjacent to the stator vanes 114 in the row. The stator vanes 114 have an angle of incidence, and from the intake side to the exhaust side, the angle of incidence of the stator vanes 114 in one row is equal to or less than the angle of the stator vanes 114 in the next row adjacent to the stator vanes 114 in the row.

[0023] First, technical terms related to this embodiment will be explained with reference to FIG. A line connecting corresponding points of the heads of multiple stator vanes 114 in the same row is called a frontal line (shown as L1 in FIG. 3 ); A line connecting corresponding points of the tails of multiple vanes 114 in the same row is called an aft line (shown as L2 in FIG. 3 ); The inlet arrangement angle is the angle formed by the tangent of the midline and the frontal line at the blade head (shown as α in FIG. 3 ); The outlet arrangement angle is the angle formed by the tangent of the midline and the trailing edge of the blade (shown as β in FIG. 3 ); The incidence angle is the angle between the frontal line of the stator vane 114 and the chord length, which changes with the change in chord length (shown as θ in FIG. 3 ); The head portion of the stator vane 114, the frontmost position of the stator vane 114 along the axial direction of the base ring component 11 is the head portion (shown as a in FIG. 3 ); The tail of the stator vane 114, the rearmost position of the stator vane 114 along the axial direction of the base ring component 11 is the tail (shown in FIG. 3 b); the height of the stator vane 114, which is the length of the stator vane 114 along the radial direction of the base ring component 11; The tip of the vane 114 is the location where the vane 114 increases along its radial direction to the apex. The chord length is the straight line distance between the head of the stator vane 114 at the midline and the tail of the stator vane 114 (shown as L4 in FIG. 3 ). The curve that connects each midpoint of the stator blade 114 in the thickness direction from the head to the tail of the stator blade 114 is called the midline (shown as L3 in FIG. 3).

[0024] The diffuser provided by this embodiment has multiple rows of stator vanes 114 installed in the diffuser along the axial direction of the base ring part, so that the airflow flowing through the diffuser can be subjected to the multi-stage drainage action of each row of stator vanes 114, thus realizing multi-stage deceleration supercharging of the airflow, thereby reducing the flow loss generated when the airflow flows through the diffuser.

[0025] The diffuser 10 provided by this embodiment will be further described below. In the diffuser 10 provided by this embodiment, multiple rows of stator vanes 114 are installed in the diffuser 10 along the axial direction of the base ring part 11, so that the airflow flowing through the diffuser 10 can be subjected to the multi-stage drainage action of each row of stator vanes 114, thereby realizing multi-stage deceleration supercharging of the airflow. From the intake side to the exhaust side of the base ring part 11, the chord length of the stator vanes 114 of one row is equal to or greater than the chord length of the stator vanes 114 of the next row adjacent to the stator vanes 114 of the row. In this way, the stator vanes 114 of each row can gradually weaken the flow separation phenomenon caused by the airflow, and the flow loss generated when the airflow flows through the diffuser 10 is significantly reduced. In this way, the airflow can be smoothly decelerated and supercharged under the premise that no large flow loss occurs due to the drainage action of each row of stator vanes 114.

[0026] In this embodiment, the heads of the stator vanes 114 have an inlet arrangement angle, and from the intake side to the exhaust side, the inlet arrangement angle of one row of stator vanes 114 is equal to or smaller than the inlet arrangement angle of the next row of stator vanes 114 adjacent to the row of stator vanes 114. The outlet arrangement angle of one row of stator vanes 114 is equal to or smaller than the outlet arrangement angle of the next row of stator vanes 114 adjacent to the row of stator vanes 114.

[0027] Specifically, the inlet arrangement angle of one row of stator vanes 114 is equal to or smaller than the inlet arrangement angle of the next row of stator vanes 114, and the outlet arrangement angle of one row of stator vanes 114 is equal to or smaller than the outlet arrangement angle of the next row of stator vanes 114, thereby more effectively suppressing the flow non-uniformity when the airflow flows from the previous row of stator vanes 114 to the next row of stator vanes 114, and at the same time, effectively suppressing the flow separation phenomenon generated when the airflow flows from the previous row of stator vanes 114 to the next row of stator vanes 114, and further effectively reducing the flow loss generated when the airflow flows from the previous row of stator vanes 114 to the next row of stator vanes 114, thereby improving the flow efficiency of the airflow.

[0028] In this embodiment, the tail of the stator vanes 114 has an outlet arrangement angle, and from the intake side to the exhaust side, the outlet arrangement angle of one row of the stator vanes 114 may be equal to or smaller than the inlet arrangement angle of the next row of the stator vanes 114 adjacent to the row of the stator vanes 114, so that the airflow flows smoothly from the previous row of the stator vanes 114 to the next row of the stator vanes 114. In this embodiment, the outlet arrangement angle of one row of the stator vanes 114 may be greater than the inlet arrangement angle of the next row of the stator vanes 114 adjacent to the row of the stator vanes 114.

[0029] 2, the diffuser 10 includes a first row stator vane 12 and a second row stator vane 13, and the first row stator vane 12 and the second row stator vane 13 are installed on the outer annular wall 111 of the base ring part 11 along the axial direction of the base ring part 11 from the intake side to the exhaust side in order. Specifically, the number of rows of the stator vanes 114 may be two rows, thus ensuring, on the one hand, a sufficient number of the stator vanes 114 to perform sufficient drainage and diffusion for the airflow, and on the other hand, ensuring that the number of the rows of the stator vanes 114 is not too large, and further realizing a compact design of the diffuser 10.

[0030] In this embodiment, the angle value of the inlet arrangement angle of the first row stator vanes 12 is 5° to 20°, and the angle value of the inlet arrangement angle of the second row stator vanes 13 is 20° to 40°. Specifically, the angle value of the inlet arrangement angle of the first row stator vanes 12 may be 5°, 5.5°, 6°, 6.5°, 7°, 7.5°, 8°, 8.5°, 9°, 9.5°, 10°, 10.5°, 11°, 11.5°, 12°, 12.5°, 13°, 13.5°, 14°, 14.5°, 15°, 15.5°, 16°, 16.5°, 17°, 17.5°, 18°, 18.5°, 19°, 19.5°, or 20°.

[0031] The angle value of the inlet arrangement angle of the second row stator vanes 13 may be 20°, 20.5°, 21°, 21.5°, 22°, 22.5°, 23°, 23.5°, 24°, 24.5°, 25°, 25.5°, 26°, 26.5°, 27°, 27.5°, 28°, 28.5°, 29°, 29.5°, 30°, 30.5°, 31°, 31.5°, 32°, 32.5°, 33°, 33.5°, 34°, 34.5, 35°, 35.5°, 36°, 36.5°, 37°, 37.5°, 38°, 38.5°, 39°, 39.5° or 40°.

[0032] By setting the angle value of the inlet arrangement angle of the first row stator vanes 12 to 5° to 20° and the angle value of the inlet arrangement angle of the second row stator vanes 13 to 20° to 40°, it is possible to further effectively suppress the flow non-uniformity generated when the airflow flows through the first row stator vanes 12 and the second row stator vanes 13, and at the same time ensure effective drainage of the airflow of the second row stator vanes 13.

[0033] In this embodiment, the angle value of the outlet arrangement angle of the first row stator vanes 12 is 10° to 60°, and the angle value of the inlet arrangement angle of the second row stator vanes 13 is 60° to 80°. Specifically, the angle value of the outlet arrangement angle of the first row stator vanes 12 may be 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, or 60°. The angle value of the inlet arrangement angle of the second row stator vanes 13 may be 60°, 61°, 62°, 63°, 64°, 65°, 66°, 67°, 68°, 69°, 70°, 71°, 72°, 73°, 74°, 75°, 76°, 77°, 78°, 79°, or 80°.

[0034] By setting the angle value of the outlet arrangement angle of the first row stator vanes 12 to 10° to 60° and the angle value of the inlet arrangement angle of the second row stator vanes 13 to 60° to 80°, the flow separation phenomenon generated when the airflow flows from the first row stator vanes 12 to the second row stator vanes 13 is effectively weakened, the flow condition of the airflow is further optimized, the flow loss generated when the airflow flows from the first row stator vanes 12 to the second row stator vanes 13 is further reduced, and at the same time the flow efficiency of the airflow is further improved.

[0035] In this embodiment, the ratio of the chord length of the first row stator vane 12 to the chord length of the second row stator vane 13 is equal to or greater than 1 and equal to or less than 5. Specifically, the ratio of the chord length of the first row stator vane 12 to the chord length of the second row stator vane 13 can be 1, 1.2, 1.5, 1.7, 2, 2.2, 2.5, 2.7, 3, 3.2, 3.5, 3.7, 4, 4.2, 4.5, 4.7, or 5. The ratio of the chord length of the first row stator vane 12 to the chord length of the second row stator vane 13 is equal to or greater than 1 and equal to or less than 5. In this way, the flow separation phenomenon generated when the airflow flows from the first row stator vane 12 to the second row stator vane 13 is further weakened, and the flow loss generated when the airflow flows through the diffuser 10 is further reduced.

[0036] In this embodiment, the number of the first row vanes 12 is equal to or less than the number of the second row vanes 13, the first row vanes 12 and the second row vanes 13 are uniformly distributed along the circumferential direction of the outer annular wall, the first row vanes 12 and the second row vanes 13 are offset from each other in the axial direction of the outer annular wall, and the head or tail of at least one vane 114 of the first row vanes 12 is aligned with the head or tail of one vane 114 of the second row vanes 13 in the axial direction of the outer annular wall. In this way, the connectivity between the first row vanes 12 and the second row vanes 13 can be made stronger, which helps the airflow to flow efficiently from the first row vanes 12 to the second row vanes 13.

[0037] In this embodiment, the number of blades of the first row stator vanes 12 is 6 to 20, and the number of blades of the second row stator vanes 13 is 10 to 30. Specifically, the number of blades of the first row stator vanes 12 may be 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20, and the number of blades of the second row stator vanes 13 may be 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30. By setting the number of blades of the first row stator vanes 12 to 6 to 20 and the number of blades of the second row stator vanes 13 to 10 to 30, the airflow can be subjected to more sufficient drainage and diffuser action of the second row stator vanes 13 when it flows from the first row stator vanes 12 to the second row stator vanes 13, further reducing the flow velocity and increasing the pressure, thus further improving the pressure boosting effect of the diffuser 10.

[0038] In this embodiment, the first row stator vanes 12 and the second row stator vanes 13 do not correspond one-to-one, and are not in a strict N-to-1 relationship. Instead, the number of the second row stator vanes 13 is first determined, and then a certain vane 114 of the second row stator vanes 13 is aligned with one end of a certain vane 114 of the first row stator vanes 12. Next, the second row stator vanes 13 are evenly arranged on the outer ring wall of the base ring part 11. After completing the arrangement of the second row stator vanes 13, the first row stator vanes 12 are arranged.

[0039] In this embodiment, as shown in Fig. 4, the distance (indicated by D in Fig. 4) between the tail of the first row stator vane 12 and the head of the second row stator vane 13 along the axial direction of the base ring part 11 is 3 mm or less. Specifically, by making the distance between the tail of the first row stator vane 12 and the head of the second row stator vane 13 along the axial direction of the base ring part 11 3 mm or less, on the one hand, a smooth connection for drainage of the airflow between the first row stator vane 12 and the second row stator vane 13 is guaranteed, and the flow efficiency of the airflow is guaranteed, and on the other hand, a sufficient assembly gap is left between the first row stator vane 12 and the second row stator vane 13, and mutual interference between the first row stator vane 12 and the second row stator vane 13 due to machining dimensional errors between the first row stator vane 12 and the second row stator vane 13 is avoided.

[0040] Preferably, the distance between the tails of the first row stator vanes 12 and the heads of the second row stator vanes 13 along the axial direction of the base ring part 11 is 1 mm or more and 3 mm or less. By further limiting the distance between the tails of the first row stator vanes 12 and the heads of the second row stator vanes 13 along the axial direction of the base ring part 11 to 1 mm or more and 3 mm or less, an optimal balance can be obtained between ensuring the flow efficiency of the airflow and avoiding mutual interference between the first row stator vanes 12 and the second row stator vanes 13, and optimal drainage and diffuser effects can be realized for the airflow flowing through the first row stator vanes 12 and the second row stator vanes 13, on the premise that the first row stator vanes 12 and the second row stator vanes 13 avoid mutual interference between them.

[0041] In this embodiment, the outlet arrangement angle includes a first outlet arrangement angle located at the blade root of the stator blade 114 and a second outlet arrangement angle located at the tip of the stator blade 114, and the difference between the angle value of the first outlet arrangement angle and the angle value of the second outlet arrangement angle is 0° to 20°.

[0042] In this manner, when the difference between the angle value of the first outlet arrangement angle and the angle value of the second outlet arrangement angle is not 0°, the contour line of the stator vane 114 along the radial direction of the base ring part 11 is a curve, and the stator vane 114 curves along the radial direction of the base ring part 11. When the difference between the two angle values ​​is 0°, this indicates that the stator vane 114 extends linearly along the radial direction of the base ring part 11, and the angle value of the outlet arrangement angle does not change along the radial direction.

[0043] Specifically, the difference between the angle value of the first outlet arrangement angle and the angle value of the second outlet arrangement angle may be 0°, 1°, 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9°, 10°, 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19° or 20°.

[0044] By setting the difference between the angle value of the outlet arrangement angle adjacent to the outer annular wall 111 of the base ring part 11 of the stator vane 114 and the angle value of the outlet arrangement angle adjacent to its tip end face of the stator vane 114 to 0° to 20°, the non-uniformity of the airflow at the tail of the stator vane 114 is thus further suppressed, thereby further ensuring effective drainage of the airflow of the stator vane 114.

[0045] In this embodiment, the stator blade 114 is an arc-shaped blade, as shown in Fig. 2. Specifically, by setting the stator blade 114 as an arc-shaped blade, the stator blade 114 has a smoother and more sleek drainage curve, and further ensures that the airflow flows through the stator blade 114 more smoothly and stably.

[0046] 1, in this embodiment, the tip end faces of the stator vanes 114 of the diffuser 10 all abut against the inner wall of the wind cover 21. Specifically, by abutting the tip end faces of the stator vanes 114 all abut against the inner wall of the wind cover 21, the stator vanes 114 can fully occupy the area surrounded by the base ring part 11 and the wind cover 21, and further realize a sufficient drainage effect on the airflow entering the blower 20, and further realize a sufficient deceleration supercharging of the airflow.

[0047] Based on the above parameter settings, some specific structures of the diffuser 10 are provided, in this embodiment, the inlet arrangement angle of the first row stator vane 12 is 15°, the outlet arrangement angle is 24°, the inlet arrangement angle of the second row stator vane 13 is 35°, and the outlet arrangement angle is 75°, and the axial distance between the tail of the first row stator vane 12 and the head of the corresponding second row stator vane 13 is 1.8mm, when the diffuser 10 takes values ​​according to the above parameters, it has good aerodynamic performance, and according to the IEC 60312 standard, the overall machine efficiency of the blower 20 with the above diffuser is about 54% under the 13mm orifice plate measurement condition.

[0048] In this embodiment, the inlet arrangement angle of the first row stator vane 12 is 20°, the outlet arrangement angle is 27°, the second row stator vane 13 is 42°, and the outlet arrangement angle is 60°. And the axial distance between the tail of the first row stator vane 12 and the head of the corresponding second row stator vane 13 is 1.3mm. When the diffuser 10 takes values ​​according to the above parameters, it has good aerodynamic performance, and the overall machine efficiency of the blower 20 having the above diffuser 10 is about 54.2% under the 13mm orifice plate measurement condition according to the IEC 60312 standard.

[0049] This embodiment further provides a blower device 20, which includes the above-mentioned diffuser 10. Specifically, the blower device 20 includes a wind cover 21, a driving mechanism 22, a movable impeller 23 and a diffuser 10, the driving mechanism 22 is installed in the wind cover 21, the movable impeller 23 is connected to the driving mechanism 22 and is installed corresponding to the air inlet 24 of the wind cover 21, and the diffuser 10 is fixed in the wind cover 21 and located on one side away from the air inlet 24 of the movable impeller 23.

[0050] Specifically, the drive mechanism 22 includes a frame 221, a motor 222 and a circuit board 223, the frame 221 and the circuit board 223 are all fixed within the wind cover 21, the motor 222 is installed on the frame 221, and the drive shaft 224 of the motor 222 passes through the frame 221 and the diffuser 10 and is connected to the movable impeller 23 to drive the movable impeller 23 to rotate.

[0051] The blower provided in this embodiment includes the diffuser, which can ensure that the deceleration supercharging can be smoothly realized under the premise that the airflow does not generate a large flow loss when passing through the diffuser, thus improving the overall working efficiency of the blower and saving the working energy consumption of the blower.

[0052] This embodiment further provides a dust collecting equipment, which includes the above-mentioned blower. The dust collecting equipment provided in this embodiment includes the above-mentioned blower, so that the blower can realize smooth deceleration and supercharging of the airflow, and is energy-saving and environmentally friendly during operation, thus significantly improving the dust collecting effect of the dust collecting equipment including the above-mentioned blower, and at the same time saving the working energy consumption of the dust collecting equipment.

[0053] Example 2 6 and 7, the diffuser 10 provided in the present embodiment will be described. The diffuser 10 includes a base ring part 11 and a plurality of stator vanes 114, the plurality of stator vanes 114 are arranged in a plurality of rows, the plurality of rows of stator vanes 114 are arranged along the axial direction of the base ring part 11, the number of stator vanes 114 in each row of stator vanes 114 is plural, and the plurality of stator vanes 114 in each row of stator vanes 114 are arranged along the circumferential direction of the base ring part 11. As a result, a flow passage 15 for guiding the flow of airflow can be formed between two adjacent stator vanes 114. When the airflow flows through the flow passage 15 between two adjacent stator vanes 114 on the circumferential side of the base ring part 11, it is guided by the stator vanes 114, so that the flow of airflow is more stable, the vortex is reduced, and energy loss is reduced. The cross section of the base ring part 11 is circular, and when the airflow is deflected radially of the base ring part 11 and rotates to flow along the axial direction of the base ring part 11, the distance it flows to each point on the circumferential side of the base ring part 11 is short and the resistance it encounters is also short, so that the airflow flows more stably on the circumferential side of the base ring part 11 and energy loss is reduced. A plurality of stator vanes 114 are installed in multiple rows along the axial direction of the base ring part 11, and the multiple rows of stator vanes 114 can guide the airflow in stages, reduce energy loss, and improve the diffuser effect.

[0054] For ease of explanation, the following definitions are given: When airflow passes through the diffuser 10, the airflow inlet direction is up, front or head, and the airflow outlet direction is down, rear or tail.

[0055] For ease of explanation, the following definitions are used: The plurality of stator vanes 114 are divided into two rows along the axial direction of the base ring component 11, and are the first row stator vanes 12 and the second row stator vanes 13 from top to bottom, i.e., the first row stator vanes 12 are the row before the second row stator vanes 13, and the second row stator vanes 13 are the row after the first row stator vanes 12. The plurality of stator vanes 114 are divided into three rows along the axial direction of the base ring component 11, and are the first row stator vanes 12, the second row stator vanes 13, and the third row stator vanes 114 from top to bottom. The plurality of stator vanes 114 are divided into four or more rows along the axial direction of the base ring component 11, and are the first row stator vanes 12, the second row stator vanes 13, the third row stator vanes 114, and so on from top to bottom. That is, when the multiple stator vanes 114 are installed in N rows (N is a positive integer and N≧2) along the axial direction of the base ring component 11, they are divided from top to bottom into a first row, a second row, ... and an Nth row, where the stator vanes 114 in the M-1th row are the stator vanes 114 in the row preceding the stator vanes 114 in the Mth row, and the stator vanes 114 in the Mth row are the stator vanes 114 in the row following the stator vanes 114 in the M-1th row (M is a positive integer and M≦N).

[0056] As shown in Fig. 11, the die surface 18 of the stator vane 114 refers to the two sides between the blade root 17 and the tip 16 of the stator vane 114, and the two sides between the blade root 17 and the tip 16 of the stator vane 114 are respectively the suction surface 19 and the pressure surface 14, and the suction surface 19 and the pressure surface 14 are collectively referred to as the die surface 18. The blade root 17 of the stator vane 114 refers to the root position close to the base ring part 11 in the height direction of the stator vane 114. The tip 16 of the stator vane 114 refers to the top position away from the base ring part 11 in the height direction of the stator vane 114. The head of the stator vane 114 refers to the part located at the front end of the stator vane 114 along the flow direction of the airflow, that is, the part that starts to contact the airflow on the stator vane 114. The tail of the stator vane 114 refers to the part located at the rear end of the stator vane 114 along the flow direction of the airflow, that is, the part on the stator vane 114 that corresponds to when the airflow leaves the stator vane 114.

[0057] 6, in the first row stator vane 12, the two side surfaces of each stator vane 114 are respectively a suction surface 19a and a pressure surface 14a, and the suction surface 19a and the pressure surface 14a are collectively referred to as the die surface 18a of the stator vane 114. A flow passage 15a for guiding the flow of air can be formed between two adjacent stator vanes 114. In the second row stator vane 13, the two side surfaces of each stator vane 114 are respectively a suction surface 19b and a pressure surface 14b, and the suction surface 19b and the pressure surface 14b are collectively referred to as the die surface 18b of the stator vane 114. A flow passage 15b for guiding the flow of air can be formed between two adjacent stator vanes 114.

[0058] 6 , the plurality of stator vanes 114 are divided into two rows along the axial direction of the base ring component 11, which are the first row stator vanes 12 and the second row stator vanes 13 from top to bottom, i.e., the first row stator vanes 12 are the row before the second row stator vanes 13, and the second row stator vanes 13 are the row after the first row stator vanes 12. In some embodiments, the plurality of stator vanes 114 are divided into three rows, four rows, or more rows along the axial direction of the base ring component 11.

[0059] In this embodiment, as shown in Fig. 7, a curved surface having the same unit thickness as the base ring part 11 is cut out at the center of the height direction of the stator vane 114, and the curved surface is cylindrical and coaxial with the base ring part 11. The curved surface is developed in a plane to obtain a planar cascade diagram of each stator vane 114. In the planar cascade diagram, the connecting line of the corresponding points of the head of each stator vane 114 in each row of stator vanes 114 is called the frontal line L1 of the stator vane 114 in that row, and the frontal line L1 is a tangent to the corresponding points of the head of each stator vane 114 in the stator vane 114 in that row. The connecting line of the corresponding points of the tail of each stator vane 114 in each row of stator vanes 114 is called the rearward line L2 of the stator vane 114 in that row, and the rearward line L2 is a tangent to the corresponding points of the tail of each stator vane 114 in the stator vane 114 in that row. The curve connecting the midpoints of the thickness H of each stator vane 114 is called the midline L3 of the stator vane 114. The included angle between the tangent of the midline L3 at the head of the corresponding stator vane 114 and the tangent of the corresponding point on the head of the stator vane 114 is the inlet arrangement angle α, i.e., the included angle between the tangent of the midline L3 at the head of the stator vane 114 and the corresponding frontal line L1 is the inlet arrangement angle α. The included angle between the tangent of the midline L3 at the tail of the stator vane 114 and the tangent of the corresponding point on the tail of the stator vane 114 is the outlet arrangement angle β, i.e., the included angle between the tangent of the midline L3 at the tail of the stator vane 114 and the corresponding aft line L2 is the inlet arrangement angle β. The distance between the head and tail of the stator vane 114 on the midline L3 is a chord length L4, and the straight-line distance between different positions on the midline L3 and the head of the stator vane 114 is the position chord length L5, i.e., the straight-line distance between each point on the midline L3 and the head of the stator vane 114 is the position chord length L5 of that point. The position chord length L5 of a certain position of the stator vane 114 has an incidence angle θ, and the incidence angle θ of the position chord length L5 is the included angle between the line segment between the position and the same height of the head of the stator vane 114 and the corresponding frontal line L1.

[0060] Take the first row stator vane 12 as an example. The connecting line of the corresponding points at the head of each stator vane 114 in the first row stator vane 12 is the frontal line L1a of the first row stator vane 12, and at the same time, the frontal line L1a is a tangent to the corresponding points at the head of each stator vane 114 in the first row stator vane 12. The connecting line of the corresponding points at the tail of each stator vane 114 in the first row stator vane 12 is the rearward line L2a of the first row stator vane 12, and at the same time, the rearward line L2a is a tangent to the corresponding points at the tail of each stator vane 114 in the first row stator vane 12. The curve connecting the midpoints of the thickness Ha of each stator vane 114 in the first row stator vane 12 is called the midline L3a of the stator vane 114. The included angle between the tangent of the midline L3a of each stator vane 114 in the first row stator vane 12 at the head of the stator vane 114 and the tangent of the corresponding point at the head of the stator vane 114 is the inlet arrangement angle αa. The angle between the tangent of the midline L3a of each stator vane 114 in the first row stator vane 12 at the tail of the stator vane 114 and the tangent of the corresponding point on the tail of the stator vane 114 is the outlet setting angle βa. The distance from the head to the tail of each stator vane 114 on the midline L3a of the first row stator vane 12 is the chord length La of the stator vane 114, and the straight-line distance from a point on the midline L3a of each stator vane 114 in the first row stator vane 12 to the head of the stator vane 114 is the position chord length L5a of the corresponding point on the stator vane 114. The position chord length L5a of a certain position of each stator vane 114 in the first row stator vane 12 has an incidence angle θa, and the incidence angle θa of the position chord length L5a is the angle between the line segment between the position and the same height of the head of the stator vane 114 and the corresponding frontal line L1a.

[0061] Take the second row stator vane 13 as an example. The connecting line of the corresponding points of the head of each stator vane 114 in the second row stator vane 13 is the frontal line L1b of the second row stator vane 13, and at the same time, the frontal line L1b is a tangent to the corresponding points of the head of each stator vane 114 in the second row stator vane 13. The connecting line of the corresponding points of the tail of each stator vane 114 in the second row stator vane 13 is the rearward line L2b of the second row stator vane 13, and at the same time, the rearward line L2b is a tangent to the corresponding points of the tail of each stator vane 114 in the second row stator vane 13. The curve connecting the midpoints of the thickness Hb of each stator vane 114 in the second row stator vane 13 is called the midline L3b of the stator vane 114. The included angle between the tangent of the midline L3b of each stator vane 114 in the second row stator vane 13 at the head of the stator vane 114 and the tangent of the corresponding point of the head of the stator vane 114 is the inlet arrangement angle αb. The angle between the tangent to the midline L3b of each stator vane 114 in the second row stator vane 13 at the tail of the stator vane 114 and the tangent to the corresponding point on the tail of the stator vane 114 is the outlet arrangement angle βb. The distance from the head to the tail of each stator vane 114 of the midline L3b of the second row stator vane 13 is the chord length Lb of the stator vane 114, and the straight-line distance from a point on the midline L3b of each stator vane 114 in the second row stator vane 13 to the head of the stator vane 114 is the position chord length L5b of the corresponding point on the stator vane 114. The position chord length L5b of a certain position of each stator vane 114 in the second row stator vane 13 has an incidence angle θb, and the incidence angle θb of the position chord length L5b is the angle between the line segment between the position and the same height of the head of the stator vane 114 and the corresponding frontal line L1b.

[0062] In this embodiment, as shown in Figures 6 and 7, in the multiple rows of stator vanes 114, the thickness H of each stator vane 114 in at least one row of stator vanes 114 is set to be non-constant from the head to the tail of the stator vane 114, so as to improve flow separation and reduce flow separation loss when the airflow enters the passage 15 between two adjacent stator vanes 114 in the row of stator vanes 114. When the airflow flows through the passage 15 between the stator vanes 114 in the row of stator vanes 114, it can improve the vortex and adjust the flow separation at the blade root 17. When the airflow flows out of the passage 15 between the stator vanes 114 in the row of stator vanes 114, it can reduce the non-uniformity of the airflow, improve the diffuser effect, and reduce aerodynamic noise.

[0063] In the diffuser 10 of this embodiment, a plurality of rows of stator vanes 114 are installed in the circumferential direction of the base ring component 11, and the airflow is guided stepwise by the plurality of rows of stator vanes 114, and the absolute speed of the airflow is reduced, thereby improving the diffuser effect. The thickness H of each stator vane 114 in at least one row of stator vanes 114 is non-constantly installed from the head to the tail of the stator vane 114, so that when the airflow enters the passage 15 between two adjacent stator vanes 114 in the row of stator vanes 114, the flow separation can be improved and the flow separation loss can be reduced. When the airflow flows through the passage 15 between the stator vanes 114 in the row of stator vanes 114, the vortex can be improved and the flow separation at the blade root 17 can be adjusted. When the airflow flows out of the passage 15 between the stator vanes 114 in the row of stator vanes 114, the non-uniformity of the airflow can be reduced, the diffuser effect can be improved, and the aerodynamic noise can be reduced.

[0064] In this embodiment, the longitudinal direction of each stator vane 114 is inclined in the axial direction of the base ring component 11, and the longitudinal direction of each stator vane 114 points in the direction where the head and tail of the stator vane 114 are connected, so that when the airflow flows through the passage 15 between the two stator vanes 114, the airflow can be gradually guided to change direction and reduce the airflow energy loss.

[0065] In this embodiment, when the diffuser 10 includes multiple rows of stator vanes 114, the thickness H of each stator vane 114 in one row of the stator vanes 114 can be set to be non-constant from the head to the tail of the stator vane 114. Of course, the thickness H of each stator vane 114 in the multiple rows of the stator vanes 114 may also be set to be non-constant from the head to the tail of the stator vane 114. Also, the thickness H of each stator vane 114 in each row of the stator vanes 114 may also be set to be non-constant from the head to the tail of the stator vane 114.

[0066] In this embodiment, in each stator vane 114 having a non-constant thickness H, the thickness H of each stator vane 114 gradually increases from the head to the tail of the stator vane 114 and then gradually decreases, so that when the airflow flows through the passage 15 between the stator vanes 114, the circumferential velocity and absolute velocity of the airflow are first gradually reduced, the flow separation loss is reduced, and then the vortex is improved, the non-uniformity of the airflow flowing out of the passage 15 between the stator vanes 114 is reduced, the flow separation loss is reduced, the diffuser effect is improved, and the aerodynamic noise is reduced.

[0067] 6 and 7, in each stator vane 114 having a non-constant thickness H, the chord length L5 at the position where the thickness H of each stator vane 114 is the largest is 30% to 45% of the chord length L of the stator vane 114, that is, in the thickness H corresponding to each point on the midline of each stator vane 114, the chord length L5 at the position where the thickness H is the largest is 30% to 45% of the chord length L of the stator vane 114. As a result, the circumferential velocity and absolute velocity of the airflow are first reduced in the stator vane 114, and then the airflow is guided in stages, improving the flow uniformity of the airflow, reducing flow separation loss, improving the diffuser effect, and reducing aerodynamic noise.

[0068] Take the first row stator vane 12 as an example. When the thickness Ha of each stator vane 114 in the first row stator vane 12 is not constant, the position chord length L5a of the point corresponding to the position where the thickness Ha is the largest in the thickness Ha corresponding to each position on the midline of each stator vane 114 in the row of stator vanes 114 is 30% to 45% of the chord length La of the stator vane 114.

[0069] Take the second row stator vane 13 as an example. When the thickness Hb of each stator vane 114 in the second row stator vane 13 is not constant, the chord length L5b of the point corresponding to the position where the thickness Hb is the largest in the thickness Hb corresponding to each position on the midline of each stator vane 114 in the row of stator vanes 114 is 30% to 45% of the chord length Lb of the stator vane 114.

[0070] 6 and 7, in the present embodiment, in each stator vane 114 that is installed with a non-constant thickness H, the chord length L5 at the position where the thickness H of each stator vane 114 is the largest is 35% to 40% of the chord length L of the stator vane 114, that is, in the thickness H corresponding to each point on the midline of each stator vane 114, the chord length L5 at the position corresponding to the point on the midline where the thickness H is the largest is 35% to 40% of the chord length L of the stator vane 114. This reduces flow separation loss, improves vortex flow, enhances the diffuser effect, and reduces aerodynamic noise.

[0071] In this embodiment, as shown in Figures 6 and 7, in the second row stator vane 13, the thickness Hb of each stator vane 114 satisfies the following relationship, that is, in the second row stator vane 13, the thickness Hb corresponding to each point on the midline of each stator vane 114 satisfies the following relationship. The thickness range of the head of each vane 114 is 0.1-0.8 mm; The range of the thickness Hb of each stator blade 114 at 40% of the chord length Lb of the stator blade 114 is 1.1-1.4 mm; The thickness range of the tail of each vane 114 is 0.1-1 mm. This can better reduce flow separation loss, improve vortex flow, enhance the diffuser effect, and reduce aerodynamic noise.

[0072] In this embodiment, as shown in Figures 6 and 7, in the second row stator vane 13, the thickness Hb of each stator vane 114 satisfies the following relationship, that is, in the second row stator vane 13, the thickness Hb corresponding to each point on the midline of each stator vane 114 satisfies the following relationship. The thickness range of the head of each vane 114 is 0.1-0.8 mm; The chord length L5b of each stator blade 114 is in the range of 1-1.3 mm at 30% of the chord length Lb of the stator blade 114, The range of the thickness Hb of each stator blade 114 at 40% of the chord length Lb of the stator blade 114 is 1.1-1.4 mm; The chord length L5b of each stator blade 114 is in the range of 1-1.3 mm at 50% of the chord length Lb of the stator blade 114, The chord length L5b of each stator blade 114 is in the range of 0.9-1.2 mm at 60% of the chord length Lb of the stator blade 114, The chord length L5b of each stator blade 114 is in the range of 0.8-1.1 mm at 70% of the chord length Lb of the stator blade 114, The thickness range of the tail of each vane 114 is 0.1-1 mm. This allows the thickness of each portion of the stator vane 114 to be better determined, further reducing flow separation loss, improving vortex flow, enhancing the diffuser effect, and reducing aerodynamic noise.

[0073] In this embodiment, as shown in FIG. 6 and FIG. 7, in the second row stator vane 13, the thickness Hb corresponding to each point on the midline of each of the stator vanes 114 satisfies the following formula. T2 ≤ Hb ≤ T1; T1=0.82+0.68L1b-0.17L1b 2 +0.011L1b 3 ; T2=0.68L1b-0.17L1b 2 +0.011L1b 3 ; Here, L1b is the distance from the corresponding point on the midline of the stator blade 114 to the head of the stator blade 114, that is, L1b is the chord length of the corresponding point on the midline of the stator blade 114, and L1b 2 is the square of L1b, and L1b 3 is the cube of L1b, so 0.68L1b is 0.68 × L1b, and 0.17L1b 2 is 0.17×L1b 2 and 0.011L1b 3 is 0.011×L1b 3 where T1 is a relational expression of the maximum thickness at a corresponding point on the midline of the stator blade 114, and T2 is a relational expression of the minimum thickness at a corresponding point on the midline of the stator blade 114.

[0074] According to the above formula, the corresponding thickness Hb of each point on the midline of each stator vane 114 in the second row stator vane 13 can be determined, so as to better reduce the flow loss, improve the non-uniformity of the airflow, improve the vortex flow, enhance the diffuser effect, and reduce the aerodynamic noise.

[0075] In this embodiment, as shown in FIG. 7, the thickness Hb of each point on the midline of each of the stator blades 114 satisfies the following formula: Hb=0.32+0.68L1b-0.17L1b 2 +0.011L1b 3 , where L1b is the distance from the corresponding point on the midline of the stator blade 114 to the head of the stator blade 114, i.e., L1b is the chord length of the corresponding point on the midline of the stator blade 114, and L1b 2 is the square of L1b, and L1b 3 is the cube of L1b, so 0.68L1b is 0.68 × L1b, and 0.17L1b 2 is 0.17×L1b 2 and 0.011L1b 3 is 0.011×L1b 3 This allows the thickness of each stator vane 114 in the second row stator vane 13 to be better determined, the flow loss to be better reduced, the non-uniformity of the airflow to be improved, the vortex to be improved, the diffuser effect to be improved, and the aerodynamic noise to be reduced.

[0076] In this embodiment, the outer diameter range of the base ring part 11 is 35-80 mm, as shown in Figures 6 and 8, which allows the thickness H of the stator vanes 114 to be better matched with the base ring part 11, ensures the size of the flow passage 15 between the adjacent stator vanes 114, reduces the resistance to airflow, reduces energy loss, and improves the diffuser effect.

[0077] In this embodiment, as shown in FIG. 12, in each stator vane 114 having a non-constant thickness H, the thickness of the blade root 17 corresponding to any position on the midline of each stator vane 114 is H1, and the thickness of the tip 16 at that position is H2, where H1≧H2, that is, the thickness H1 of the blade root 17 at any position on the midline of each stator vane 114 is equal to or greater than the thickness H2 of the tip 16 at that position, thereby better adjusting the flow separation near the blade root 17, reducing the flow separation loss, and improving the diffuser effect.

[0078] In this embodiment, as shown in FIG. 12, for each stator vane 114 having a non-uniform thickness H, 0≦H1-H2≦0.5 mm, that is, the thickness of the blade root 17 at any position of each stator vane 114 is made 0.5 mm or less thicker than the tip 16, which makes it easier to process and manufacture, ensures the strength of the tip 16 at any position of each stator vane 114, and at the same time adjusts the flow separation near the blade root 17, reduces the flow separation loss, and improves the diffuser effect.

[0079] In this embodiment, as shown in FIG. 12 , the thickness H of each stator vane 114 is non-constant, and the thickness H of each vane 114 at each point on the midline is gradually increased from the blade root 17 to the tip 16 of the stator vane 114, so as to better adjust the flow separation near the blade root 17, reduce the flow separation loss, and improve the diffuser effect.

[0080] When the diffuser 10 is used, the airflow flows circumferentially from the movable impeller outlet with a radial bias and at a high speed, and then turns axially in a very short distance of the wind cover to enter the diffuser 10, so the flow separation at the movable impeller outlet is serious.

[0081] In this embodiment, the setting angle θ of each stator vane 114 at each point is gradually increased from the head to the tail of the stator vane 114, so that the circumferential velocity and absolute velocity of the airflow are gradually reduced, and the deceleration supercharging effect is improved. At the same time, in accordance with the inclination of the mold surface 18 of the stator vane 114, the vortex in the flow passage 15 can be further reduced, energy loss can be reduced, and the diffuser effect can be improved.

[0082] In this embodiment, the change of the setting angle θ at different positions of the chord length L5 of the stator vane 114 is as follows: The setting angle θ of each position of the first half of the stator vane 114 is basically equal to the inlet arrangement angle α, which uniformly increases the area of ​​the flow passage 15 between the first half of the stator vanes 114, and achieves uniform reduction in the absolute airflow velocity and the diffuser effect. The setting angle θ of the second half of the stator vane 114 increases from the inlet arrangement angle α to the outlet arrangement angle β, which reduces the circumferential velocity and absolute velocity of the airflow, and further improves the deceleration supercharging effect.

[0083] 7, in the first row stator vane 12, the inlet arrangement angle αa of each stator vane 114 is in the range of 5 degrees to 10 degrees. The inlet arrangement angle αa of each stator vane 114 is in the range of 5 degrees to 10 degrees, which can better match with an airflow having a high circumferential velocity at the inlet of the stator vane 114, uniformly reduce the absolute airflow velocity, and improve the diffuser effect.

[0084] 7, in the second row stator vane 13, the inlet arrangement angle αb of each stator vane 114 ranges from 20 degrees to 60 degrees. The inlet arrangement angle αb of each stator vane 114 ranges from 20 degrees to 60 degrees, which can better match the airflow having a high circumferential velocity at the inlet of the stator vane 114, uniformly reduce the absolute airflow velocity, and improve the diffuser effect.

[0085] In this embodiment, in the first row stator vanes 12, the inlet arrangement angle αa of each stator vane 114 ranges from 5 degrees to 10 degrees. In the second row stator vanes 13, the inlet arrangement angle αb of each stator vane 114 ranges from 20 degrees to 60 degrees. Air can be circulated from the first row stator vanes 12 to the second row stator vanes 13, the circumferential velocity and absolute velocity can be gradually reduced, the non-uniformity of the airflow at the tail of the first row stator vanes 12 is reduced, the flow loss is further reduced, and the diffuser effect is improved.

[0086] In this embodiment, in the first row stator vane 12, the outlet arrangement angle βa of each stator vane 114 is in the range of 10 degrees to 20 degrees. When the airflow flows out from the tail of the stator vane 114, the angular distribution of the airflow is more non-uniform, so the outlet arrangement angle βa is in the range of 10 degrees to 20 degrees, which can further suppress the non-uniformity of the outlet flow at the tail of the stator vane 114, reduce the energy loss, and improve the deceleration supercharging effect.

[0087] In this embodiment, in the first row stator vanes 12, the inlet arrangement angle αa of each stator vane 114 ranges from 10 degrees to 20 degrees. In the second row stator vanes 13, the inlet arrangement angle αb of each stator vane 114 ranges from 20 degrees to 60 degrees. The airflow can be circulated from the first row stator vanes 12 to the second row stator vanes 13, the circumferential velocity and absolute velocity can be gradually reduced, the flow loss in the airflow process can be gently reduced, and the diffuser effect is improved.

[0088] In this embodiment, in the second row stator vane 13, the outlet arrangement angle βb of each stator vane 114 is in the range of 50 degrees to 90 degrees. When the airflow flows out from the tail of the stator vane 114, the angular distribution of the airflow is more non-uniform, so the outlet arrangement angle βb is in the range of 50 degrees to 90 degrees, which can further suppress the non-uniformity of the flow at the tail outlet of the stator vane 114, reduce the energy loss, and improve the deceleration supercharging effect.

[0089] In this embodiment, in the first row stator vanes 12, the inlet arrangement angle αa of each stator vane 114 ranges from 10 degrees to 20 degrees. In the second row stator vanes 13, the inlet arrangement angle αb of each stator vane 114 ranges from 50 degrees to 90 degrees. The airflow can be circulated from the first row stator vanes 12 to the second row stator vanes 13, the circumferential velocity and absolute velocity can be gradually reduced, the non-uniformity of the airflow at the tail of the first row stator vanes 12 can be reduced, and the diffuser effect can be improved.

[0090] In this embodiment, in the second row stator vanes 13, the outlet arrangement angle βb of each stator vane 114 ranges from 60 degrees to 90 degrees, and the inlet arrangement angle αb of each stator vane 114 ranges from 25 degrees to 50 degrees, which better suppresses the non-uniformity of the flow at the tail outlet of the stator vane 114, thereby reducing energy loss and improving the deceleration supercharging effect.

[0091] In this embodiment, the inlet arrangement angle α of each stator vane 114 varies by 10 degrees or less along the radial direction of the base ring part 11, that is, the inlet arrangement angle α of each stator vane 114 varies by 10 degrees or less from the blade root 17 to the tip 16, and the inlet arrangement angle α at the blade root 17 of each stator vane 114 is equal to or greater than the inlet arrangement angle α at the tip 16 of the stator vane 114. On the one hand, this makes it easier to process and manufacture, and on the other hand, it can reduce flow separation loss and improve the diffuser effect.

[0092] 6 and 8, in this embodiment, in two adjacent rows of stator vanes 114, the number of stator vanes 114 in the next row of stator vanes 114 is 1.5 to 3 times the number of stator vanes 114 in the previous row of stator vanes 114. The number of stator vanes 114 in the previous row of stator vanes 114 is relatively small, and the number of stator vanes 114 in the next row of stator vanes 114 is relatively large, so that when the airflow passes through each row of stator vanes 114 in sequence, the guidance of the airflow can be gradually strengthened, the airflow can be slowed down, and the diffuser effect can be improved.

[0093] 6 and 8, in two adjacent rows of stator vanes 114, the tail of each stator vane 114 in the previous row is offset from the head of the corresponding stator vane 114 in the next row by 20 degrees or less along the circumferential direction of the base ring member 11. That is, the included angle between the plane passing through the blade root 17 of the tail of each stator vane 114 in the previous row and the axis of the base ring member 11 and the plane passing through the blade root 17 of the head of the corresponding stator vane 114 in the next row and the axis of the base ring member 11 is 20 degrees or less, thereby reducing the non-uniformity of the airflow, reducing the flow separation loss, and improving the diffuser effect.

[0094] In this embodiment, referring to FIG. 14, in two adjacent rows of stator vanes 114, the tail of each stator vane 114 in the previous row is aligned with the head of the corresponding stator vane 114 in the next adjacent row, thereby reducing the non-uniformity of the airflow, reducing the flow separation loss, and improving the diffuser effect.

[0095] In this embodiment, as shown in Figures 9, 10 and 11, the inclination angle Q of the mold surface 18 at a certain point on the stator vane 114 refers to the included angle between a line segment where the mold surface 18 of the stator vane 114 intersects with the radial plane of the base ring part 11 that passes through that point on the stator vane 114, and a radial line that passes through that point on the stator vane 114.

[0096] In this embodiment, the radial surface of the base ring part 11 refers to a plane perpendicular to the axial direction of the base ring part 11, the radial line is a radial line of the base ring part 11, the radial line of the base ring part 11 refers to a straight line extending along the radial direction of the base ring part 11, and the radial line passing through the point on the stator blade 114 refers to a straight line extending along the radial direction of the base ring part 11 and passing through the point.

[0097] In this embodiment, for each stator vane 114 that is inclined relative to the mold surface 18, the inclination angle of the mold surface 18 at the tail of each stator vane 114 is equal to or greater than the inclination angle of the mold surface 18 at the head of the stator vane 114. By setting the inclination angle of the mold surface 18 at the tail of each stator vane 114 equal to or greater than the inclination angle of the mold surface 18 at the head, when the airflow flows through the passage 15 between the stator vanes 114, the stator vanes 114 gradually strengthen the guidance and adjustment of the airflow, improve the vortex in the passage 15, reduce the separation loss, further reduce the airflow energy loss, and reduce noise.

[0098] In this embodiment, the inclination angle of each stator vane 114 relative to the mold surface 18 is gradually increased from the head to the tail of the stator vane 114, so that when the airflow flows through the passage 15 between the stator vanes 114 in the row, the airflow can be gradually adjusted, thereby improving the airflow separation loss, reducing energy loss and reducing noise.

[0099] 9 and 10, in the second row stator vane 13, the inclination angle Q2 of the die surface 18b at the head of each stator vane 114 is Q1, and the inclination angle Q2 of the die surface 18b at the tail of each stator vane 114 is Q2, where Q2≧Q1. The inclination angle Q2 of the die surface 18b at the tail of each stator vane 114 in the second row stator vane 13 is set to be equal to or greater than the inclination angle Q1 of the die surface 18b at the head, so that when the airflow flows through the passage 15b between the stator vanes 114, the stator vanes 114 gradually strengthen the guidance and adjustment of the airflow, improve the vortex in the passage 15b, reduce the separation loss, further reduce the airflow energy loss, and reduce noise.

[0100] 9 and 10, in the second row stator vane 13, the value of Q1 ranges from 0 degrees to 30 degrees, that is, the inclination angle Q1 of the mold surface 18b at the head of each stator vane 114 is less than 30 degrees, so that when the airflow enters the passage 15b between the stator vanes 114, the rotation angle of the airflow is adjusted too much, which can avoid a large energy loss. The value of Q2 ranges from 0 degrees to 40 degrees, that is, the inclination angle Q2 of the mold surface 18b at the tail of each stator vane 114 is less than 40 degrees, so that when the airflow flows through the passage 15b between the stator vanes 114, the rotation angle of the airflow is adjusted too much, which can avoid a large energy loss.

[0101] 9 and 10, in the second row stator vane 13, the value of Q1 is in the range of 12 degrees to 18 degrees, so that the flow separation loss can be better reduced and the noise can be reduced when the airflow enters the passage 15b between the stator vanes 114. The value of Q2 is in the range of 20 degrees to 35 degrees, and Q2≧Q1. When the airflow flows through the passage 15b between the stator vanes 114, the flow separation loss can be better reduced, the energy loss can be reduced, and the aerodynamic noise can be reduced.

[0102] In this embodiment, in the second row stator vane 13, the value of Q1 is in the range of 0 degrees to 30 degrees, thereby avoiding excessive adjustment of the rotation angle of the airflow when it enters the passage 15b between the stator vanes 114, which would result in large energy loss. The value of Q2 is in the range of 15 degrees to 40 degrees, thereby avoiding excessive adjustment of the airflow when it flows through the passage 15b between the stator vanes 114, which would result in large energy loss.

[0103] In this embodiment, as shown in FIG. 9 , the included angle between a plane passing through the blade root 17 at the head of each stator vane 114 and corresponding to the axis of the base ring component 11 and a plane passing through the blade root 17 at the tail of the stator vane 114 and corresponding to the axis of the base ring component 11 is the wrap angle P of the stator vane 114.

[0104] In this embodiment, as shown in Figure 9, in two adjacent rows of stator vanes 114, the winding angle of each stator vane 114 in the previous row is equal to or larger than the winding angle of each stator vane 114 in the next row of stator vanes 114. Setting the winding angle of each stator vane 114 in the previous row of stator vanes 114 larger can better guide the airflow in a stepwise manner, reduce the separation loss, and improve the diffuser effect.

[0105] 7, in two adjacent rows of stator vanes 114, the chord length La of each stator vane 114 in the previous row is equal to or greater than the chord length Lb of each stator vane 114 in the next row of stator vanes 114. When the airflow enters the diffuser 10, it has a large circumferential velocity, so that when the airflow flows through each row of stator vanes 114, the chord length Lb of each stator vane 114 in the previous row of stator vanes 114 is set to be longer, so that the airflow can be better guided, the circumferential velocity of the airflow can be reduced, and the airflow can be guided step by step by the stator vanes 114 in each row, thereby reducing the separation loss.

[0106] In this embodiment, as shown in Fig. 13, a plane passing through the axial direction of the base ring part 11 is the meridian plane of the diffuser 10, and each stator vane 114 projected onto the meridian plane along the circumferential direction of the base ring part 11 is the meridian projection of the stator vane 114. A leading edge line 214 of each stator vane 114 is a line segment projected onto the meridian plane of the head of the stator vane 114. A trailing edge line 215 of each stator vane 114 is a line segment projected onto the meridian plane of the tail of the stator vane 114. The intersection line between the radial plane of the base ring part 11 and the meridian projection is a line segment perpendicular to the axial direction of the base ring part 11.

[0107] In this embodiment, in at least one row of stator vanes 114, the leading edge line 214 of each stator vane 114 is inclined to the radial surface of the base ring part 11. That is, a line segment in a meridian projection plane of the leading edge line 214 of each stator vane 114 in the row of stator vanes 114 is inclined to the radial direction of the base ring part 11. This can reduce flow separation loss and improve the diffuser effect.

[0108] In this embodiment, when the diffuser 10 includes multiple rows of stator vanes 114, the leading edge line 214 of each stator vane 114 in one row of the stator vanes 114 can be installed so as to be inclined toward the radial surface of the base ring component 11. Of course, the leading edge line 214 of each stator vane 114 in the multiple rows of the stator vanes 114 may also be installed so as to be inclined toward the radial surface of the base ring 11. The leading edge line 214 of each stator vane 114 in each row of the stator vanes 114 may also be installed so as to be inclined toward the radial surface of the base ring 11.

[0109] 13, in the second row stator vanes 13, the absolute value of the inclination angle B1 between the leading edge line 214 of each of the stator vanes 114 and the radial surface of the base ring component 11 is less than 25 degrees. By making the absolute value of the inclination angle B1 between the leading edge line 214 of each of the stator vanes 114 and the radial surface of the base ring component 11 in the second row stator vanes 13 less than 25 degrees, the flow separation loss can be better reduced and the diffuser effect can be improved.

[0110] In this embodiment, as shown in FIG. 13, in the second row stator vanes 13, the leading edge line 214 of each stator vane 114 is inclined toward the tail of the stator vane 114, so as to further adjust the flow separation near the blade root 17, reduce the flow separation loss, and improve the diffuser effect.

[0111] In this embodiment, in at least one row of stator vanes 114, the trailing edge line 215 of each stator vane 114 is installed at an incline toward the radial surface of the base ring part 11. In other words, a line segment in a meridian projection plane of the trailing edge line 215 of each stator vane 114 in the row of stator vanes 114 is inclined toward the radial direction of the base ring part 11. This can reduce non-uniformity of the airflow at the outlet of the stator vane 114 and improve the diffuser effect.

[0112] In this embodiment, when the diffuser 10 includes multiple rows of stator vanes 114, the trailing edge line 215 of each stator vane 114 in one row of the stator vanes 114 can be installed so as to be inclined toward the radial surface of the base ring component 11. Of course, the trailing edge line 215 of each stator vane 114 in the multiple rows of the stator vanes 114 may also be installed so as to be inclined toward the radial surface of the base ring 11. Of each row of stator vanes 114, the trailing edge line 215 of each stator vane 114 may also be installed so as to be inclined toward the radial surface of the base ring 11.

[0113] 13, in the second row stator vanes 13, the absolute value of the inclination angle B2 between the trailing edge line 215 of each of the stator vanes 114 and the radial surface of the base ring component 11 is 30 degrees or less. By making the absolute value of the inclination angle B2 between the trailing edge line 215 of each of the stator vanes 114 in the second row stator vanes 13 and the radial surface of the base ring component 11 30 degrees or less, the uniformity of the airflow at the outlet of the stator vanes 114 is better improved, and the diffuser effect is improved.

[0114] In this embodiment, the diffuser 10 further includes a housing (not shown), the base ring part 11 is disposed in the housing, and each stator vane 114 is located between the base ring part 11 and the housing. The housing can be installed to not only protect each stator vane 114, but also form a passage between the base ring part 11 and the housing, which can better define the passage through which the air flows and ensure the consistency of the diffuser 10 in the use performance of different blower devices.

[0115] In this embodiment, at least 80% of the area of ​​the top surface of each stator vane 114 contacts the inner surface of the housing, i.e., at least 80% of the area of ​​the tip 16 of each stator vane 114 contacts the inner surface of the housing, which better defines the flow passage 15 through which the airflow flows by each stator vane 114, the base ring component 11 and the housing, and further better guides the flow of the airflow, thereby improving the diffuser effect.

[0116] In this embodiment, the housing, the base ring part 11 and each stator vane 114 are integrally molded to ensure good connection between the housing and each stator vane 114 and at the same time increase the strength of the diffuser 10 .

[0117] In this embodiment, the housing can be manufactured separately, and the base ring component 11 with the stator vanes 114 is then placed within the housing.

[0118] The diffuser 10 of this embodiment can effectively improve the vortex flow in the flow passage 15, reduce the separation loss, reduce the energy loss, improve the diffuser effect, and reduce the aerodynamic noise. When the diffuser 10 of this embodiment is used in a blower, it can generate a large suction force and generate small operating noise. The diffuser 10 of this embodiment can be applied not only to blowers, but also to electrical appliances such as dust collectors, range hoods, and blowers.

[0119] 15, this embodiment further provides a blower 20, which includes a frame 221, an impeller 31, a wind cover 32, a motor 222 and a diffuser 10 according to any of the above embodiments, in which the diffuser 10 is mounted on the frame 221, the impeller 31 is provided at the front end of the diffuser 10, the wind cover 32 covers the impeller 31 and is mounted on the frame 221, the motor 222 is mounted on the frame 221, and the motor 222 is connected to the impeller 31. By using the diffuser 10 according to the above embodiment, the blower 20 can reduce energy loss and reduce running noise, and can generate a larger suction force with the same power.

[0120] In this embodiment, as shown in FIG. 15, a bearing 225 is attached to the base ring part 11, and the drive shaft 224 of the motor 222 passes through the bearing 225 and is connected to the impeller 31, so that the motor 222 can rotate the impeller 31 more flexibly.

[0121] In this embodiment, as shown in Fig. 15, the impeller 31 is a closed centrifugal impeller 31a. In this embodiment, the impeller 31 may be an open centrifugal impeller. In this embodiment, as shown in Fig. 11, the impeller 31 may further be a mixed flow impeller 31b.

[0122] In this embodiment, as shown in FIG. 16, the wind cover 32 can be extended to the tail of the diffuser 10, that is, the wind cover 32 simultaneously covers the impeller 31 and the diffuser 10, thereby better guiding the airflow at the outlet of the impeller 31 to the diffuser 10.

[0123] In this embodiment, the frame 221 can be integrally molded with the windshield 32, thereby ensuring the connection strength between the frame 221 and the windshield 32.

[0124] The blower 20 of this embodiment can be applied to electrical equipment such as dust collection equipment, range hoods, blowers, and fans.

[0125] This embodiment further discloses a dust collection system, which includes the blower device 20 described in any of the above embodiments. The dust collection system of this embodiment uses the above blower device 20, which not only has high power and high efficiency, but also has low noise.

[0126] Example 3 The present embodiment differs from the second embodiment in the following points: As shown in Figures 6, 9 and 10, in the multiple rows of stator vanes 114, the die surface 18 of each stator vane 114 in at least one row of stator vanes 114 is inclined toward one side of the stator vane 114. By inclining the die surface 18 of the corresponding stator vane 114 toward one side of the stator vane 114, that is, the height direction of the die surface 18 of the stator vane 114 is inclined toward the radial direction of the base ring part 11, it is possible to effectively improve the boundary layer separation when the airflow leaves the stator vanes 114, reduce the separation loss, improve the vortex in the flow passage 15 between the stator vanes 114, further reduce the flow loss, reduce the airflow energy loss, and reduce the aerodynamic noise.

[0127] In this embodiment, the die surface 18a of each stator vane 114 in the first row stator vane 12 can be inclined, so that when the airflow passes through the first row stator vane 12, the absolute speed of the airflow is reduced, and at the same time, the separation loss is reduced and the diffuser effect is improved.

[0128] In this embodiment, as shown in Figures 6 and 8, the die surface 18b of each stator vane 114 in the second row stator vane 13 can be inclined, so that when the airflow passes through the second row stator vane 13, the absolute airflow velocity is reduced, the separation loss is reduced, and the diffuser effect is improved.

[0129] In this embodiment, the die faces 18 of each of the first row stator vanes 114 of the first row stator vanes 12 and each of the second row stator vanes 114 of the second row stator vanes 13 are both inclined, which can better reduce the airflow speed, decrease the separation loss, reduce the non-uniformity of the airflow, and improve the diffuser effect.

[0130] In this embodiment, when the diffuser 10 includes multiple rows of stator vanes 114, the die surfaces 18 of the stator vanes 114 in one row of the stator vanes 114 can be inclined. Of course, the die surfaces 18 of the stator vanes 114 in several rows of the stator vanes 114 may be inclined. The die surfaces 18 of the stator vanes 114 in each row may all be inclined.

[0131] In this embodiment, the mold surface 18 of each stator vane 114 is inclined toward one side of the suction surface 19 of the stator vane 114, which can better improve the separation of the airflow boundary layer, improve the vortex in the passage 15 between the stator vanes 114, reduce energy loss, and reduce aerodynamic noise.

[0132] In this embodiment, when the die surface 18a of each stator vane 114 in the first row of stator vanes 12 is installed at an incline, the die surface 18a of each stator vane 114 in the first row of stator vanes 12 is installed at an incline toward one side of the suction surface 19a of the stator vane 114.

[0133] In this embodiment, as shown in Figures 6 and 9, when the mold surface 18b of each stator vane 114 in the second row stator vane 13 is installed at an incline, the mold surface 18 of each stator vane 114 in the second row stator vane 13 is installed at an incline toward one side of the suction surface 19b of the stator vane 114.

[0134] In this embodiment, the mold surface 18 of each stator vane 114 is inclined toward one side of the pressure surface 14 of the stator vane 114, which can better improve the non-uniformity of the airflow, improve the vortex in the flow passage 15 between the stator vanes 114, reduce energy loss, and reduce aerodynamic noise.

[0135] In this embodiment, when the die surface 18a of each stator vane 114 in the first row stator vane 12 is installed at an incline, the die surface 18a of each stator vane 114 in the first row stator vane 12 is installed at an incline toward one side of the pressure surface 14a of the stator vane 114.

[0136] In this embodiment, as shown in Figures 6 and 9, when the die surface 18b of each stator vane 114 in the second row stator vane 13 is installed at an incline, the die surface 18 of each stator vane 114 in the second row stator vane 13 is installed at an incline toward one side of the pressure surface 14b of the stator vane 114.

[0137] The above are only preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application should be included within the scope of protection of the present application.

Claims

1. a diffuser comprising a base ring component and a plurality of stator vanes, the plurality of stator vanes being arranged in a plurality of rows in sequence along the axial direction of the base ring component, the number of the stator vanes in each row being plural, the plurality of stator vanes in each row being arranged along the circumferential direction of the base ring component, the base ring component having a circular cross section, a die surface of each of the stator vanes in at least one row of the plurality of rows of stator vanes being arranged at an inclination such that a height direction of the die surface of the stator vane is inclined relative to a radial direction of the base ring component when viewed from the axial direction of the base ring component, the plurality of rows of stator vanes including first row stator vanes and second row stator vanes, the first row stator vanes and the second row stator vanes being arranged in sequence along the axial direction from the intake side to the exhaust side, A diffuser, wherein a thickness Hb corresponding to each point on a midline of each of the second row stator vanes satisfies the following formula 1 or 2. T2≦Hb≦T1 (Formula 1); T1=0.82+0.68L1b-0.17L1b 2 +0.011L1b 3; T2=0.68L1b-0.17L1b2 +0.011L1b3; Hb=0.32+0.68L1b-0.17L1b 2 +0.011L1b 3 (Formula 2) Here, L1b is the distance from the corresponding point on the midline of the stator vane to the head of the stator vane, L1b 2 is the square of L1b, L1b 3 is the cube of L1b, T1 is the relational expression for the maximum thickness at the corresponding point on the midline of the stator vane, and T2 is the relational expression for the minimum thickness at the corresponding point on the midline of the stator vane.

2. 2. The diffuser according to claim 1, wherein, in each of the vanes having an inclined die surface, the die surface of the vane is inclined in a direction in which the suction surface of the vane faces the base ring component.

3. A diffuser as described in claim 2, characterized in that the inclination angle of the mold surface of the tail portion of each of the stator vanes is greater than or equal to the inclination angle of the mold surface of the head portion of the stator vane.

4. A diffuser as described in claim 1, characterized in that the mold surface of each of the second row of stator vanes is installed at an incline in a direction such that the suction surface of the stator vane faces the base ring component.

5. 5. The diffuser according to claim 4, wherein in the second row of stator vanes, when viewed in the axial direction of the base ring part, an inclination angle of a die surface at a head portion of each of the stator vanes is Q1, an inclination angle of a die surface at a tail portion of each of the stator vanes is Q2, the value of Q1 ranges from 0 degrees to 30 degrees, and the value of Q2 ranges from 0 degrees to 40 degrees.

6. 2. The diffuser according to claim 1, wherein, for each of the vanes having an inclined die surface, the die surface of the vane is inclined in a direction in which the pressure surface of the vane faces the base ring component.

7. 2. The diffuser according to claim 1, wherein, in each of the stator vanes having an inclined die surface, the inclination angle of the die surface of each of the stator vanes gradually increases from the head portion to the tail portion of the stator vane as viewed in the axial direction of the base ring part.

8. The diffuser of claim 1 , wherein in at least one row of said vanes, a leading edge line of each said vane is angled relative to a radial surface of said base ring component.

9. A diffuser as described in claim 8, characterized in that in the second row of stator vanes, the absolute value of the inclination angle between the leading edge line of each of the stator vanes and the radial surface of the base ring component is 25 degrees or less.

10. The diffuser of claim 1 , wherein in at least one row of said vanes, a trailing edge line of each said vane is angled relative to a radial plane of said base ring component.

11. A diffuser as described in Claim 10, characterized in that in the second row of stator vanes, the absolute value of the inclination angle between the trailing edge line of each of the stator vanes and the radial surface of the base ring component is 30 degrees or less.

12. 2. The diffuser according to claim 1, wherein in two adjacent rows of vanes, the chord length of each of the vanes in the previous row is equal to or greater than the chord length of each of the vanes in the next row.

13. 2. The diffuser according to claim 1, wherein in two adjacent rows of vanes, the number of vanes in the next row of vanes is 1.5 to 3 times the number of vanes in the previous row of vanes.

14. 2. The diffuser according to claim 1, wherein in two adjacent rows of vanes, the wrap angle of each of the vanes in the previous row is equal to or greater than the wrap angle of each of the vanes in the next row.

15. 2. The diffuser of claim 1, wherein in two adjacent rows of vanes, the tail of each vane in a previous row of vanes is aligned with the head of a corresponding vane in the next adjacent row.

16. 2. The diffuser of claim 1, wherein in two adjacent rows of vanes, the tail of each vane in a previous row of vanes is offset along a circumferential direction of the base ring component by no more than 20 degrees from the head of a corresponding vane in the next adjacent row.

17. 2. The diffuser of claim 1, wherein the incidence angle at each location on each of said vanes increases gradually from the head to the tail of said vanes.

18. 2. The diffuser of claim 1, wherein the inlet arrangement angle of each of the stator vanes varies by no more than 10 degrees along a radial direction of the base ring component, and the inlet arrangement angle of each of the stator vanes at a root is equal to or greater than the inlet arrangement angle of the stator vane at a tip.

19. A diffuser as described in claim 1, characterized in that in the second row of stator vanes, the inlet arrangement angle of each of the stator vanes is in the range of 20 degrees to 60 degrees.

20. A diffuser as described in claim 1, characterized in that in the second row of stator vanes, the outlet arrangement angle of each of the stator vanes is in the range of 50 degrees to 90 degrees.

21. The diffuser of claim 1 , wherein said diffuser further comprises a housing, said base ring component being disposed within said housing, and each of said vanes being located between said base ring component and said housing.

22. The diffuser as recited in claim 21, wherein at least 80% of the area of ​​the top surface of each said vane contacts the inner surface of said housing.

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