CN113074137A

CN113074137A - Air supply device and dust collector

Info

Publication number: CN113074137A
Application number: CN202010010957.XA
Authority: CN
Inventors: 吴魁; 乔正忠; 杨继峰; 彭敏; 蒋婷婷
Original assignee: Guangdong Welling Motor Manufacturing Co Ltd
Current assignee: Guangdong Welling Motor Manufacturing Co Ltd
Priority date: 2020-01-06
Filing date: 2020-01-06
Publication date: 2021-07-06
Anticipated expiration: 2040-01-06
Also published as: CN113074137B

Abstract

The application provides an air supply device and a dust collector. The air supply device comprises a casing, an impeller, a rotating shaft, a motor and a fan cover, wherein the fan cover comprises a cylindrical section and an end cover section arranged at the front end of the cylindrical section, an air inlet is formed in the middle of the end cover section, a flow guide air passage is formed between the inner surface of the fan cover and the radial outer side of the impeller, an annular air passage is formed in the front section of the casing, and an annular air passage is formed between the rear section of the casing and the motor; along the axial direction of the casing: the sum of the length of the annular air duct and the length of the annular air passage is L, the axial length of the cylindrical section is H, and L is more than or equal to 3H. The application provides an air supply arrangement, with each setting of the length of annular wind channel in the casing and annular air flue more than or equal to 3 times of the last tube-shape section length of wind cover, then the air current can be in annular air flue diffusion once more after annular wind channel drainage diffusion to better guide the even axial flow of air current, effectively increase air current drainage channel, reduce the loss of flow, raise the efficiency, the noise reduction.

Description

Air supply device and dust collector

Technical Field

The application belongs to the field of fans, and particularly relates to an air supply device and a dust collector using the same.

Background

The existing fans used by equipment such as a handheld dust collector and the like have the characteristics of small volume and high rotating speed (generally between 6 ten thousand rpm and 15 ten thousand rpm). These fans are developing more and more towards high performance and high power absorption. The motor of the fan drives the impeller to rotate, the airflow is sucked from the inlet of the fan cover, after obtaining larger kinetic energy through the impeller, flows out from the edge of the impeller along the radial direction of the impeller, and is guided and guided by the fan cover, so that the airflow is converted from the radial direction to the axial direction to flow into the air duct of the machine shell for diffusion, and then flows out from the rear side of the machine shell. However, the current casing structure of the fan has a large influence on the air flow, resulting in low air supply efficiency.

Disclosure of Invention

An object of the present invention is to provide an air supply device, so as to solve the problem that the casing of the air supply device in the related art may cause a reduction in air supply efficiency.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions: the air supply device comprises a casing, an impeller, a rotating shaft, a motor and a fan cover, wherein the impeller is arranged on the front side of the casing, the rotating shaft drives the impeller to rotate, the motor drives the rotating shaft to rotate, the fan cover covers the impeller, the fan cover is connected with the casing, the motor is arranged on the rear side of the casing, the fan cover comprises a cylindrical section and an end cover section arranged at the front end of the cylindrical section, an air inlet is formed in the middle of the end cover section, a flow guide air passage is formed between the inner surface of the fan cover and the radial outer side of the impeller, an annular air passage is arranged in the front section of the casing, the annular air passage extends backwards from the flow guide air passage, an annular air passage is formed between the rear section of the casing and the motor, and the annular; along the axial direction of the casing: the sum of the length of the annular air duct and the length of the annular air passage is L, the axial length of the cylindrical section is H, and L is more than or equal to 3H.

In one embodiment, the annular air passage has an axial length C along the casing, and L is less than or equal to 2.5C.

In one embodiment, the annular air duct has an axial length W along the casing, wherein W is more than or equal to C.

In one embodiment, a support is arranged in the casing, a plurality of positioning surfaces for matching, positioning and supporting the motor are arranged on the support, and the annular air passage is formed between the part between the rear end surface of the casing and the positioning surfaces and the motor.

In one embodiment, the bracket comprises a plurality of ribs protruding radially from the inner surface of the housing, and the positioning surface is provided at the rear end of at least two of the ribs.

In one embodiment, a protrusion protrudes backward from the rib corresponding to each positioning surface, and each positioning surface is disposed on the corresponding protrusion.

In one embodiment, the end cap section has a filter section protruding forward from a middle portion thereof, the filter section having a ring shape, the filter section surrounding the air inlet.

In one embodiment, a diffuser is installed in the casing, the diffuser comprises a base installed on the front section of the casing and a plurality of static blades arranged along the circumferential direction of the base, and the annular air duct is formed between the front section of the casing and the base; and a flow channel for guiding airflow is formed between every two adjacent static blades.

In one embodiment, a length direction of at least a part of the stationary blades is inclined to an axial direction of the base.

In one embodiment, the plurality of stationary blades are sequentially arranged in a plurality of rows along the axial direction of the base, and the number of stationary blades in each row of stationary blades is a plurality, and the plurality of stationary blades in each row of stationary blades is arranged along the circumferential direction of the base.

In one embodiment, in two adjacent rows of the stationary blades: the axial distance D between each static blade in the previous row of static blades and each static blade in the next row of static blades along the base is less than or equal to 1.5 mm.

In one embodiment, the diffuser includes a plurality of the bases respectively supporting the rows of the stationary blades, and each row of the stationary blades is mounted on the corresponding base.

In one embodiment, in two adjacent rows of the stationary blades: the number of stationary blades in the next row of stationary blades is greater than the number of stationary blades in the previous row of stationary blades.

Another object of the embodiments of the present application is to provide a vacuum cleaner, which includes the air supply device as described in the above embodiments.

One or more technical solutions in the embodiments of the present application have at least one of the following technical effects:

the air supply arrangement that this application embodiment provided, with each setting of annular wind channel in the casing and annular air flue's length be more than or equal to 3 times of the last tube-shape segment length of wind cover, then the air current is after annular wind channel drainage diffusion, can expand again in annular air flue to better guide the even axial flow of air current, effectively increase air current drainage channel, reduce the loss of flow, raise the efficiency, the noise abatement.

The dust collector provided by the embodiment of the application uses the air supply device, the air flow loss is small, the power is high, the efficiency is high, and the noise is low.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or exemplary technical descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic cross-sectional structural diagram of an air supply device according to an embodiment of the present application.

Fig. 2 is a schematic cross-sectional structure view of the wind shield in fig. 1.

Fig. 3 is a schematic cross-sectional view of the fan housing and the casing in fig. 1 after being combined.

Fig. 4 is a first structural schematic diagram of the chassis in fig. 1.

Fig. 5 is a second schematic structural diagram of the chassis in fig. 1.

Fig. 6 is a schematic structural view of the diffuser of fig. 1.

Fig. 7 is a schematic cross-sectional structural diagram of an air supply device according to a second embodiment of the present application.

Fig. 8 is a sectional structure view of the casing and the diffuser of fig. 6.

Fig. 9 is a schematic perspective view of the diffuser in fig. 6.

Fig. 10 is a schematic front view of a diffuser in the blower device according to the third embodiment of the present application.

Wherein, in the drawings, the reference numerals are mainly as follows:

100-air supply device; 11-a housing; 12-a scaffold; 121-ribs; 122-a support ring; 123-bump; 124-a positioning surface; 125-mounting holes; 13-adjusting the cushion layer; 14-an annular air duct; 15-an annular air passage; 21-an impeller; 22-a fan cover; 221-barrel section; 222-an end cap segment; 223-a filtration section; 224-an air inlet; 23-a rotating shaft; 24-a motor; 25-a circuit board; 26-a bearing; 27-a diversion air passage; 30-a diffuser; 31-a base; 33-stationary blades; 330-flow channel.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.

In the description of the present application, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present application.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in some embodiments" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

For convenience of description, define: the direction of the airflow inlet of the air supply device is upward, forward or head, and the direction of the airflow outlet of the air supply device is downward, backward or tail.

Referring to fig. 1, fig. 2 and fig. 3, an air supply device 100 according to an embodiment of the present application will now be described. The air supply device 100 includes a casing 11, an impeller 21, a rotating shaft 23, a motor 24 and a wind shield 22, wherein the impeller 21 is installed on the front side of the casing 11, the impeller 21 is installed on the rotating shaft 23, the rotating shaft 23 is connected with the motor 24, the motor 24 is installed in the casing 11, and the motor 24 is located at the rear section of the casing 11. The motor 24 can drive the rotation shaft 23 to rotate, so as to drive the impeller 21 to rotate. The fan housing 22 is connected to the casing 11, and the fan housing 22 covers the impeller 21. The fan housing 22 includes a cylindrical section 221 and an end cover section 222 disposed at the front end of the cylindrical section 221, and an air inlet 224 is disposed in the middle of the end cover section 222, so that when the impeller 21 rotates, air can enter the impeller 21 from the air inlet 224 to be driven by the impeller 21 to flow. A guide air duct 27 is formed between an inner surface 225 of the hood 22 and a radially outer side of the impeller 21 to guide the air flow flowing out of the impeller 21 to flow backward. The casing 11 has an annular air duct 14 in the front section, the annular air duct 14 extends backward from the air guide duct 27, and the annular air duct 14 is communicated with the air guide duct 27, so that the air flow flowing out of the impeller 21 is guided by the air guide duct 27 to turn backward and enters the annular air duct 14 for diffusion. Form annular air flue 15 between the back end of casing 11 and motor 24, annular air flue 15 is extended backward by annular air flue 14 to annular air flue 15 can guide, rectification and diffusion deceleration to the air current that annular air flue 14 flows out, with promotion diffusion effect, can also dispel the heat to motor 24 simultaneously. In the axial direction of the housing 11: the sum of the length of the annular air duct 14 and the length of the annular air duct 15 is L, the axial length of the cylindrical section 221 is H, L is larger than or equal to 3H, namely the sum L of the lengths of the annular air duct 14 and the annular air duct 15 is larger than or equal to 3 times of the length H of the cylindrical section 221 on the fan cover 22, so that a larger diffusion channel is formed in the casing 11, an airflow drainage channel is effectively increased, airflow flows out more regularly, flow loss is reduced, efficiency is improved, and noise is reduced.

The air supply device 100 provided in the embodiment of the present application sets the lengths of the annular air duct 14 and the annular air duct 15 in the casing 11 to be greater than or equal to 3 times of the length of the upper cylindrical section 221 of the fan housing 22, so that the air flow can be expanded in the annular air duct 15 again after being subjected to flow guiding and pressure expanding through the annular air duct 14, and the air flow can be better guided to flow axially and uniformly, thereby effectively increasing the air flow guiding channel, reducing the flow loss, improving the efficiency, and reducing the noise.

Referring to Table 1 below, Table 1 is a table comparing the suction power and efficiency of experiments using the blowing device with L ≧ 3H in the examples of the present application and using the current blowing device with L < 3H. In the experiment, the input power of the air supply devices is the same, and the input voltage and the input current are the same, so that the working conditions of the two air supply devices are consistent. The aperture in table 1 is the diameter of the inlet of the air supply device, i.e. the diameter of the air inlet of the air supply device. When the current air supply device is in normal use or normal use, the diameter of an air inlet (such as a dust collector) of the current air supply device is generally 10-13 mm. There are also some air supply arrangements where the air inlet is arranged to be up to 16 mm. Therefore, in the experiment, the aperture of the air inlet of the air supply device is subjected to value test from the range of 0-50mm, so that the size of the air inlet when the air supply device is normally used is ensured. The suction power and the efficiency corresponding to each aperture are average values of a plurality of groups of experiments, so that the data obtained by the experiments are more accurate.

TABLE 1

From the above table, in the air supply device with L ≧ 3H in the embodiment of the present application and the air supply device with L < 3H currently, when the aperture is less than 20mm, the suction power and efficiency of the air supply device in the embodiment of the present application are both higher than those of the air supply device with L < 3H currently, that is, when the air supply device is normally used or normally used, the suction power and efficiency are both higher.

Therefore, in the embodiment of the present application, the sum L of the lengths of the annular air duct 14 and the annular air duct 15 is greater than or equal to 3 times the length H of the cylindrical section 221 of the wind shield 22, so that the flow loss can be reduced, and the efficiency can be improved.

In one embodiment, referring to fig. 1 and 3, the annular air duct 15 has an axial length C along the casing 11, L ≦ 2.5C; that is, 2.5 times of the length C of the annular air duct 15 is greater than or equal to the sum L of the lengths of the annular air duct 14 and the annular air duct 15, so as to avoid that the length of the casing 11 is too large, which results in the too large volume of the air supply device 100; meanwhile, the structure can lead the air flow to flow out of the shell 11 more regularly by the annular air passage 15 with larger length, thereby reducing the air flow loss.

In one embodiment, referring to fig. 1 and 3, the annular duct 14 has an axial length W along the casing 11, and L is W + C. W is larger than or equal to C, namely the length W of the annular air duct 14 is larger than or equal to the length C of the annular air duct 15, so that the air flow is guided to reduce the speed and expand the pressure in the annular air duct 14 better, the flow loss of the air flow is reduced, and the expansion effect is improved.

In one embodiment, referring to fig. 1, the blower 100 further includes a circuit board 25, and the circuit board 25 is fixedly connected to the motor 24 to drive the motor 24 to operate. In some embodiments, the circuit board 25 may be disposed outside the housing 11, or the operation of the motor 24 may be controlled by an external controller.

In one embodiment, referring to fig. 1, 3 and 4, a frame 12 is disposed in the housing 11, a plurality of positioning surfaces 124 for supporting the motor 24 in a matching manner are disposed on the frame 12, and the annular air duct 15 is formed between the portion between the rear end surface of the housing 11 and the positioning surfaces 124 and the motor 24. A bracket 12 is provided in the cabinet 11 to mount the stationary motor 24. While a plurality of locating surfaces 124 are provided on the bracket 12 to better locate the motor 24 during installation of the motor 24 to better secure the motor 24. The annular air passage 15 is formed between the motor 24 and the part between the rear end surface of the machine shell 11 and the positioning surface 124, and the distance between the positioning surface 124 and the rear end surface of the machine shell 11 is equal to the length C of the annular air passage 15 along the axial direction of the machine shell 11. The distance from the hood 22 to the positioning surface 124 in the casing 11 is equal to the length W of the annular air duct 14 along the axial direction of the casing 11.

In one embodiment, referring to fig. 1, 3 and 4, the number of the positioning surfaces 124 is at least two to more smoothly position and support the motor 24.

In one embodiment, referring to fig. 3, 4 and 5, in the plurality of locating surfaces 124 of the support 12: at least the distance between the two positioning surfaces 124 with the shortest distance to the rear end of the machine shell 11 is less than or equal to 0.1 mm; when the motor 24 is installed, the positioning surface 124, which is the shortest distance from the rear end of the housing 11, of the plurality of positioning surfaces 124 supports the motor 24 first, that is, the positioning surface 124, which is the shortest distance from the rear end of the housing 11, serves as a positioning reference to position the motor 24 first. And the distance between the two positioning surfaces 124 which are the shortest distance away from the rear end of the machine shell 11 is less than or equal to 0.1mm, so that the two positioning surfaces 124 can more stably and accurately support and position the motor 24, the motor 24 is ensured to stably rotate at a high speed, the vibration of the motor 24 is reduced, and the efficiency of the motor 24 is improved.

In one embodiment, referring to fig. 3, 4 and 5, in the plurality of locating surfaces 124 of the support 12: a positioning surface 124 with the shortest distance to the rear end of the housing 11 is used as a reference surface 124 a; the setting mat 13 is provided on each of the setting surfaces 124 having a distance greater than 0.1mm from the reference surface 124a among the setting surfaces 124. That is, the setting of the adjustment cushions 13 on the positioning surfaces 124 which are largely displaced from the reference surface enables the motor 24 to be supported more accurately, the motor 24 to be supported more stably, and vibration of the motor 24 during operation to be reduced. And the adjusting cushion layer 13 is arranged, so that the processing and the manufacturing are convenient, and the adjustment is also convenient.

In one embodiment, the shim 13 may be a cured coating disposed on the corresponding locating surface 124 to facilitate control of the thickness of the shim 13.

In one embodiment, the setting member 13 may be a shim, such as a shim that is applied to the corresponding positioning surface 124 for adjustment. The spacer may be a plastic sheet, a paper sheet, or the like.

In one embodiment, the shim 13 is a hard layer to more stably support the motor 24, reduce wobbling of the motor 24 during operation, and reduce vibration of the motor 24 during operation.

In one embodiment, referring to fig. 3, 4 and 5, the bracket 12 includes a plurality of ribs 121 protruding radially from the inner surface of the housing 11, and the rear ends of at least two ribs 121 are provided with positioning surfaces 124. The provision of the plurality of ribs 121 not only increases the strength of the housing 11 but also facilitates the support of the motor 24.

In one embodiment, referring to fig. 3, 4 and 5, the bracket 12 further includes a support ring 122 connected to each rib 121 to increase the strength of the housing 11.

In an embodiment, referring to fig. 3, 4 and 5, the rib 121 corresponding to each positioning surface 124 is protruded with a protrusion 123, each positioning surface 124 is disposed on the corresponding protrusion 123, the protrusion 123 is disposed on the rib 121, and the positioning surface 124 is disposed on the corresponding protrusion 123, so that the positioning surface 124 can be processed better, and the precision of the positioning surface 124 can be improved.

In one embodiment, referring to fig. 3, 4 and 5, at least two positioning surfaces 124 are provided with mounting holes 125 for fixedly connecting the motor 24, so as to mount and fix the motor 24.

In an embodiment, referring to fig. 1, fig. 2 and fig. 3, a filter segment 223 protrudes forward from a middle portion of the end cover segment 222 of the fan housing 22, the filter segment 223 is annular, and the filter segment 223 surrounds the air inlet 224, so that air can be better guided to smoothly enter the impeller 21, and efficiency is improved.

In one embodiment, referring to fig. 1 and 6, a diffuser 30 is installed in the casing 11, the diffuser 30 includes a base 31 and a plurality of stationary blades 33, the base 31 is installed at a front section of the casing 11, and the annular air duct 14 is formed between an inner surface of the casing 11 and the base 31. A flow passage 330 for guiding the flow of the gas flow is formed between two adjacent stationary blades 33. The plurality of stationary blades 33 are arranged along the circumferential direction of the base 31, so that when the airflow passes through the flow passage 330 between two adjacent stationary blades 33 on the circumferential side of the base 31, the airflow is guided by the stationary blades 33 to flow, the airflow is more stable, the vortex is reduced, and the energy loss is reduced.

In one embodiment, a cylinder may also be disposed in the housing 11 such that an annular air duct 14 is formed between the inner surface of the housing 11 and the cylinder.

In one embodiment, referring to fig. 1, a bearing 26 is installed in the housing 11, and the bearing 26 is sleeved on the rotating shaft 23 to support the rotating shaft 23 in the housing 11, so that the rotating shaft 23 can stably and flexibly drive the impeller 21 to rotate in the housing 11.

In one embodiment, referring to fig. 1, the bearing 26 is mounted in the base 31 of the diffuser 30 to facilitate supporting the bearing 26.

In one embodiment, referring to fig. 1 and 6, the cross section of the base 31 is circular, so that when the airflow flows along the axial direction of the base 31 by rotating radially toward the base 31, the airflow flows to the peripheral side of the base 31 at similar distances, so that the airflow is subjected to similar resistance, and thus the airflow flows to the peripheral side of the base 31 more smoothly, and the energy loss is reduced.

In an embodiment, referring to fig. 1 and 6, the length direction of at least some of the stationary blades 33 is inclined to the axial direction of the base 31, and the length direction of each stationary blade 33 refers to the direction in which the head and the tail of the stationary blade 33 are connected, so that the airflow can be guided better and the energy loss of the airflow can be reduced.

In one embodiment, referring to fig. 1 and 6, the length direction of each stationary blade 33 is inclined to the axial direction of the base 31, so that the airflow can be gradually guided to change the direction when flowing through the flow channel 330 between two stationary blades 33, thereby reducing the energy loss of the airflow.

In one embodiment, referring to fig. 7, 8 and 9, in the diffuser 30 of the blowing device 100, as in the second embodiment: the plurality of stationary blades 33 are sequentially arranged in a plurality of rows along the axial direction of the base 31, the number of the stationary blades 33 in each row of the stationary blades 32 is a plurality, and the plurality of the stationary blades 33 in each row of the stationary blades 32 are arranged along the circumferential direction of the base 31; that is, the plurality of stationary blades 33 are arranged in a plurality of rows, the plurality of rows of stationary blades 32 are arranged in the axial direction of the base 31, the number of the stationary blades 33 in each row of the stationary blades 32 is plural, the plurality of stationary blades 33 in each row of the stationary blades 32 are arranged in the circumferential direction of the base 31, the plurality of stationary blades 33 are arranged in a plurality of rows in the axial direction of the base 31, and the flow of the air can be gradually guided by the plurality of rows of the stationary blades 32, so that the energy loss is reduced, and the diffuser effect is improved.

For convenience of description, define: the plurality of stationary blades 33 are divided into two rows in the axial direction of the base 31, and the first row of stationary blades 32a and the second row of stationary blades 32b are arranged in this order from top to bottom, that is, the first row of stationary blades 32a is the upper row of the second row of stationary blades 32b, and the second row of stationary blades 32b is the lower row of the first row of stationary blades 32 a. The plurality of stationary blades 33 are divided into three rows in the axial direction of the base 31, and the first row of stationary blades 32a, the second row of stationary blades 32b, and the third row of stationary blades are arranged in this order from the top down. The plurality of stationary blades 33 are divided into four or more rows in the axial direction of the base 31, and the first row of stationary blades 32a, the second row of stationary blades 32b, and the third row of stationary blades … … are arranged in this order from the top down. That is, when the plurality of stationary blades 33 are arranged in N (N is a positive integer, N is not less than 2) rows along the axial direction of the base 31, the plurality of stationary blades are sequentially divided into a first row and a second row … …, i.e., the nth row from top to bottom; the M-1 th row of static blades is a previous row of static blades of the M-1 th row of static blades, the M-th row of static blades is a next row of static blades of the M-1 th row of static blades, wherein M is a positive integer and is less than or equal to N.

In one embodiment, referring to fig. 7, 8 and 9, in two adjacent rows of stationary blades 32: the number of stationary blades 33b in the next row of stationary blades 32b is larger than the number of stationary blades 33a in the previous row of stationary blades 32 a. The number of the stationary blades 33a in the previous row of the stationary blades 32a is relatively small, and the number of the stationary blades 33b in the next row of the stationary blades 32b is set to be large, so that when the airflow sequentially passes through each row of the stationary blades 32, the guiding airflow can be gradually enhanced, the speed of the airflow is reduced, and the supercharging effect is improved.

In one embodiment, referring to fig. 7, 8 and 9, in two adjacent rows of stationary blades 32: the number of the stationary blades 33b in the next row of the stationary blades 32b is 1.5 to 4 times the number of the stationary blades 33a in the previous row of the stationary blades 32 a. The air flow is guided by better reinforcement, the speed of the air flow is reduced, and the supercharging effect is improved.

In one embodiment, referring to FIG. 9, in rows of vanes 32: the plurality of stationary blades 33 in the at least one row of stationary blades 32 are uniformly arranged along the circumferential direction of the base 31, so that the airflow is more uniform when passing through the row of stationary blades 32.

In one embodiment, referring to FIG. 9, in rows of vanes 32: the plurality of stationary blades 33 in the at least one row of stationary blades 32 are disposed non-uniformly in the circumferential direction of the base 31 to facilitate manufacturing.

In one embodiment, the housing 11 may be integrally formed with the hood 22 to ensure the connection strength between the frame and the hood 22. In one embodiment, the housing 11 and the hood 22 are separately fabricated to facilitate processing and precise design of the air guide duct 27.

In one embodiment, referring to FIG. 10, as in the third embodiment, in two adjacent rows of stationary blades 32: the stator blades 33a of the upper row of stator blades 32a and the stator blades 33b of the lower row of stator blades 32b are arranged at intervals in the axial direction of the base 31 for convenient processing.

In one embodiment, referring to FIG. 10, in two adjacent rows of stationary blades 32: the axial distance D between each stationary blade 33a in the upper row of stationary blades 32a and each stationary blade 33b in the lower row of stationary blades 32b along the base 31 is less than or equal to 1.5mm, so that the flow loss is reduced, and the efficiency of the diffuser 30 is improved.

In one embodiment, referring to fig. 10, the base 31 is multiple, that is, the diffuser 30 includes a plurality of bases 31 supporting each row of stationary blades 32, and each row of stationary blades 32 is mounted on the corresponding base 31 to facilitate manufacturing.

The air supply device 100 of the embodiment of the application can be applied to electric appliances such as a dust collector, a range hood, a blower, a fan and the like.

The embodiment of the application also discloses a dust collector which comprises the air supply device 100 in any embodiment. The dust collector of the embodiment of the application uses the air supply device 100, the air flow loss is small, the power is high, the efficiency is high, and the noise is low.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. Air supply arrangement, its characterized in that: the fan comprises a casing, an impeller, a rotating shaft, a motor and a fan cover, wherein the impeller is arranged on the front side of the casing, the rotating shaft drives the impeller to rotate, the motor drives the rotating shaft to rotate, the fan cover covers the impeller, the fan cover is connected with the casing, the motor is arranged on the rear side of the casing, the fan cover comprises a cylindrical section and an end cover section arranged at the front end of the cylindrical section, an air inlet is formed in the middle of the end cover section, a flow guide air passage is formed between the inner surface of the fan cover and the radial outer side of the impeller, an annular air duct is arranged in the front section of the casing, the annular air duct extends backwards from the flow guide air passage, an annular air passage is formed between the rear section of the casing and the motor; along the axial direction of the casing: the sum of the length of the annular air duct and the length of the annular air passage is L, the axial length of the cylindrical section is H, and L is more than or equal to 3H.

2. The air supply apparatus of claim 1, wherein: the annular air passage has an axial length C along the casing, and L is less than or equal to 2.5C.

3. The air supply apparatus of claim 2, wherein: the annular air duct has an axial length W along the casing, wherein W is not less than C.

4. An air supply arrangement as defined in any of claims 1-3, characterized in that: the motor is characterized in that a support is arranged in the shell, a plurality of positioning surfaces used for matching, positioning and supporting the motor are arranged on the support, and the annular air passage is formed between the part between the rear end face of the shell and the positioning surfaces and the motor.

5. The air supply apparatus of claim 4, wherein: the support include by a plurality of ribs of casing internal surface radial bulge, at least two the rear end of rib is equipped with the locating surface.

6. The air supply apparatus of claim 5, wherein: the rib corresponding to each positioning surface is provided with a convex block which protrudes backwards, and each positioning surface is arranged on the corresponding convex block.

7. An air supply arrangement as defined in any of claims 1-3, characterized in that: the middle part of the end cover section is protruded forwards with a filter section which is annular, and the filter section surrounds the air inlet.

8. An air supply arrangement as defined in any of claims 1-3, characterized in that: a diffuser is arranged in the casing and comprises a base arranged on the front section of the casing and a plurality of stationary blades arranged along the circumferential direction of the base, and the annular air duct is formed between the front section of the casing and the base; and a flow channel for guiding airflow is formed between every two adjacent static blades.

9. The air supply apparatus of claim 8, wherein: at least part of the stator blades are arranged in a length direction inclined to the axial direction of the base.

10. The air supply apparatus of claim 8, wherein: the plurality of the static blades are arranged in sequence along the axial direction of the base to form a plurality of rows, the quantity of the static blades in each row of the static blades is a plurality, and the static blades in each row of the static blades are arranged along the circumferential direction of the base.

11. The air supply apparatus of claim 10, wherein, in two adjacent rows of the stationary blades: the axial distance D between each static blade in the previous row of static blades and each static blade in the next row of static blades along the base is less than or equal to 1.5 mm.

12. The air supply apparatus of claim 10, wherein: the diffuser includes a plurality of the bases respectively supporting the respective rows of the stationary blades, and the respective rows of the stationary blades are mounted on the respective bases.

13. The air supply apparatus of claim 10, wherein, in two adjacent rows of the stationary blades: the number of stationary blades in the next row of stationary blades is greater than the number of stationary blades in the previous row of stationary blades.

14. The dust catcher, its characterized in that: comprising an air supply arrangement as claimed in any of claims 1-13.