CN113074137B - Air supply device and dust collector - Google Patents

Abstract

The application provides an air supply device and a dust collector. The air supply device comprises a shell, 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 shell, and an annular air passage is formed between the rear section of the shell and the motor; along the axial direction of the shell: the sum of the length of the annular air channel and the length of the annular air channel is L, and the axial length of the cylindrical section is H, wherein L is more than or equal to 3H. The utility model provides an air supply arrangement, with the length of annular wind channel in the casing with each setting of annular wind channel and annular air flue be greater than or equal to the 3 times of cylindrical section length on the fan housing, then the air current can diffuse once more in annular air flue after annular wind channel drainage diffusion to the even axial flow of better guide air current effectively increases the air current drainage passageway, reduces flow loss, raises the efficiency, the noise reduction.

Description

Air supply device and dust collector

Technical Field

The application belongs to the fan field, and more specifically relates to an air supply device and a dust collector using the same.

Background

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

Disclosure of Invention

An objective of the present embodiment is to provide an air-blowing device, so as to solve the problem that the casing in the air-blowing device in the related art can cause the decrease of air-blowing efficiency.

In order to achieve the above purpose, the technical scheme adopted in the embodiment of the application is as follows: the utility model provides an air supply device, including the casing, install in impeller of casing front side, drive the pivot of impeller rotation, drive the motor of pivot rotation and cover in the fan housing on the impeller, the fan housing with the casing links to each other, the motor is installed in the casing rear side, the fan housing includes tube-shape section and locates the end cover section of tube-shape section front end, the air inlet has been seted up at the middle part of end cover section, the internal surface of fan housing with form the water conservancy diversion air flue between the radial outside of impeller, annular wind channel has in the front section of casing, annular wind channel is by water conservancy diversion air flue backward extension, form annular air flue between the rear section of casing and the motor, annular air flue is by annular wind channel backward extension; along the axial direction of the casing: the sum of the length of the annular air duct and the length of the annular air duct is L, and the axial length of the cylindrical section is H, wherein L is more than or equal to 3H.

In one embodiment, the annular air passage has an axial length C, L.ltoreq.2.5C along the housing.

In one embodiment, the annular air duct has an axial length W, W being greater than or equal to C, along the housing.

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

In one embodiment, the support comprises a plurality of ribs radially protruding from the inner surface of the casing, and the rear ends of at least two ribs are provided with the positioning surfaces.

In one embodiment, the ribs corresponding to the positioning surfaces are provided with lugs in a backward protruding mode, and each positioning surface is arranged on the corresponding lug.

In one embodiment, the middle part of the end cover section is protruded forward to form a filtering section, the filtering section is annular, and the filtering section encloses 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 stationary blades circumferentially arranged along the base, and the annular air duct is formed between the front section of the casing and the base; and a flow passage for guiding airflow to flow is formed between two adjacent stator blades.

In one embodiment, at least a part of the stator blades are disposed with their longitudinal direction inclined to the axial direction of the base.

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

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

In one embodiment, the diffuser includes a plurality of the pedestals that respectively support each row of the stationary vanes, each row of the stationary vanes being mounted on a corresponding one of the pedestals.

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

Another object of the embodiments of the present application is to provide a dust collector, which includes the air supply device according to the above embodiments.

The above technical solutions in the embodiments of the present application have at least one of the following technical effects:

according to the air supply device, the lengths of the annular air channel and the annular air channel in the shell are respectively set to be more than or equal to 3 times of the length of the cylindrical section on the fan housing, so that air flow can be diffused again in the annular air channel after being diffused through the annular air channel, and the air flow can be guided to flow uniformly and axially better, so that the air flow guide channel is effectively increased, the flow loss is reduced, the efficiency is improved, and the noise is reduced.

The dust collector provided by the embodiment of the application uses the air supply device, so that the airflow flowing 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 that are required for the description of the embodiments or exemplary techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.

Fig. 1 is a schematic cross-sectional structure of an air supply device according to an embodiment of the present disclosure.

Fig. 2 is a schematic cross-sectional view of the stroke cover of fig. 1.

Fig. 3 is a schematic cross-sectional view of the fan cover and the casing of fig. 1.

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

Fig. 5 is a schematic diagram of a second structure of the enclosure in fig. 1.

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

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

FIG. 8 is a cross-sectional view of the housing and diffuser assembly of FIG. 6.

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

Fig. 10 is a schematic front view of a diffuser in an air supply device according to a third embodiment of the present disclosure.

Wherein, each reference numeral in the figure mainly marks:

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

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, 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 for purposes of illustration only and are not intended to limit the present application.

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

In the description of the present application, it should 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 that are based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

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 phrase "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 air inlet of the air supply device is in the upper, front or head direction, and the air outlet is in the lower, rear or tail direction.

Referring to fig. 1, 2 and 3, an air supply device 100 according to a first embodiment of the present application will be described. The blower 100 includes a housing 11, an impeller 21, a rotating shaft 23, a motor 24, and a fan housing 22, wherein the impeller 21 is mounted on the front side of the housing 11, and the impeller 21 is mounted on the rotating shaft 23, the rotating shaft 23 is connected to the motor 24, the motor 24 is mounted in the housing 11, and the motor 24 is located at the rear section of the housing 11. The motor 24 can drive the rotating shaft 23 to rotate so as to drive the impeller 21 to rotate. A fan housing 22 is connected to the casing 11, and the fan housing 22 is covered on the impeller 21. The fan housing 22 comprises a cylindrical section 221 and an end cover section 222 arranged at the front end of the cylindrical section 221, wherein an air inlet 224 is formed 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 to flow by the impeller 21. A flow guide passage 27 is formed between the inner surface 225 of the fan housing 22 and the radially outer side of the impeller 21 to guide the air flow flowing out of the impeller 21 rearward. The front section of the casing 11 is provided with an annular air duct 14, the annular air duct 14 extends backwards from the diversion air duct 27, and the annular air duct 14 is communicated with the diversion air duct 27 so that the air flow flowing out of the impeller 21 is guided to be changed to enter the annular air duct 14 for diffusion after being guided by the diversion air duct 27. An annular air passage 15 is formed between the rear section of the casing 11 and the motor 24, and the annular air passage 15 extends backwards from the annular air passage 14, so that the annular air passage 15 can guide, rectify and diffuse air flow flowing out of the annular air passage 14 to reduce speed, thereby improving diffusion effect and dissipating heat of the motor 24. Along 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 more 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 more than or equal to 3 times of the length H of the cylindrical section 221 on the fan housing 22, so that a larger diffusion channel is formed in the fan housing 11, an airflow drainage channel is effectively increased, airflow flows out more regularly, flow loss is reduced, efficiency is improved, and noise is reduced.

According to the air supply device 100 provided by the embodiment of the application, the lengths of the annular air duct 14 and the annular air duct 15 in the shell 11 are respectively set to be more than or equal to 3 times the length of the cylindrical section 221 on the fan housing 22, so that air flow can be diffused again in the annular air duct 15 after being guided and diffused by the annular air duct 14, and the air flow can be guided to flow uniformly and axially better, so that the air flow guiding channel is effectively increased, the flow loss is reduced, the efficiency is improved, and the noise is reduced.

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

TABLE 1

From the above table, in the embodiment of the present application, the air supply device with the diameter L being greater than or equal to 3H and the air supply device with the diameter L being less than 3H are both higher than the air supply device with the diameter L being less than 3H, that is, when the air supply device is normally used or conventionally used, the suction power and the efficiency are both higher.

Therefore, in the embodiment of the 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 on the fan housing 22, so that the flow loss can be reduced and the efficiency can be improved.

In one embodiment, referring to FIGS. 1 and 3, the annular air passage 15 has an axial length C, L.ltoreq.2.5C along the housing 11; that is, 2.5 times of the length C of the annular air passage 15 is larger than or equal to the sum L of the lengths of the annular air passage 14 and the annular air passage 15, so as to avoid the overlarge length of the shell 11 and the overlarge volume of the air supply device 100; at the same time, the structure can have a larger length of the annular air passage 15 so as to guide the air flow to flow out of the shell 11 more regularly, and reduce the flow loss of the air flow.

In one embodiment, referring to fig. 1 and 3, the annular duct 14 has an axial length W along the housing 11, and l=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 air flow is guided to be slowed down and diffused in the annular air duct 14 better, the flow loss of the air flow is reduced, and the diffusion effect is improved.

In one embodiment, referring to fig. 1, the air supply device 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 motor 24 may be controlled to operate by an external controller.

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

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

In one embodiment, referring to fig. 3, 4 and 5, among the plurality of locating surfaces 124 of the bracket 12: the distance between the two positioning surfaces 124 at least to the rear end of the casing 11, which is the shortest, is less than or equal to 0.1mm; when the motor 24 is mounted, one of the positioning surfaces 124 having the shortest distance from the rear end of the housing 11 will first support the motor 24, i.e. the positioning surface 124 having the shortest distance from the rear end of the housing 11 will serve as a positioning reference, and will position the motor 24 first. And the distance between the two shortest positioning surfaces 124 from the rear end of the casing 11 is smaller than or equal to 0.1mm, so that the two positioning surfaces 124 can support and position the motor 24 more stably and accurately, the motor 24 is ensured to rotate stably at 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, among the plurality of locating surfaces 124 of the bracket 12: a positioning surface 124 having the shortest distance to the rear end of the housing 11 is a reference surface 124a; the adjustment blanket 13 is provided on each of the positioning surfaces 124 having a distance greater than 0.1mm from the reference surface 124a among the positioning surfaces 124. That is, the motor 24 can be supported more precisely by providing the adjustment shim 13 on each positioning surface 124 which is greatly offset from the reference surface, so that the motor 24 can be supported more smoothly, and the vibration of the motor 24 during operation can be reduced. 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 stock 13 may be a cured coating disposed on the corresponding locating surface 124 to facilitate control of the thickness of the shim stock 13.

In one embodiment, the shim 13 may be a shim, such as by attaching the shim to the corresponding locating surface 124 for adjustment purposes. The gasket 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 wobble during operation of the motor 24, and reduce vibration during operation of the motor 24.

In one embodiment, referring to fig. 3, 4 and 5, the bracket 12 includes a plurality of ribs 121 radially protruding from an inner surface of the housing 11, and a positioning surface 124 is provided at a rear end of at least two of the ribs 121. Providing a plurality of ribs 121 not only increases the strength of the housing 11, but also facilitates supporting 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 one embodiment, referring to fig. 3, 4 and 5, the ribs 121 corresponding to each positioning surface 124 are protruded with the protrusions 123 backward, each positioning surface 124 is disposed on the corresponding protrusion 123, the protrusions 123 are disposed on the ribs 121, and the positioning surfaces 124 are disposed on the corresponding protrusions 123, so that the positioning surfaces 124 can be processed better, and the accuracy of the positioning surfaces 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 to mount the fixed motor 24.

In one embodiment, referring to fig. 1, 2 and 3, the middle part of the end cover section 222 of the fan housing 22 is protruded forward to form a filtering section 223, the filtering section 223 is annular, and the filtering section 223 encloses an air inlet 224, so that air can be better guided to enter the impeller 21 smoothly, 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 stator 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 air is formed between two adjacent stator blades 33. The plurality of stator blades 33 are arranged along the circumferential direction of the base 31, so that when the air flows through the flow channel 330 between two adjacent stator blades 33 on the circumferential side of the base 31, the air flows are guided by the stator blades 33, the air flow is smoother, the vortex is reduced, and the energy loss is reduced.

In one embodiment, a cylinder may be disposed in the housing 11, so that an annular air channel 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 a 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 from the radial rotation of the base 31, the airflow flows to the peripheral side of the base 31 at similar distances, and the resistance is also similar, so that the airflow flows to the peripheral side of the base 31 more smoothly, and the energy loss is reduced.

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

In one embodiment, referring to fig. 1 and 6, when the length direction of each stator vane 33 is inclined to the axial direction of the base 31, the airflow can be gradually guided to change direction when flowing through the flow channel 330 between the two stator vanes 33, so as to reduce the energy loss of the airflow.

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

For convenience of description, define: the plurality of stator blades 33 are divided into two rows along the axial direction of the base 31, and a first row of stator blades 32a and a second row of stator blades 32b are sequentially arranged from top to bottom, that is, the first row of stator blades 32a is the upper row of the second row of stator blades 32b, and the second row of stator blades 32b is the next row of the first row of stator blades 32 a. The plurality of stator blades 33 are divided into three rows in the axial direction of the base 31, namely, a first row of stator blades 32a, a second row of stator blades 32b, and a third row of stator blades in this order from top to bottom. The plurality of stator blades 33 are divided into four or more rows in the axial direction of the base 31, and then the first row of stator blades 32a, the second row of stator blades 32b, and the third row of stator blades … … are sequentially arranged from top to bottom. That is, when the plurality of stator 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 stator blades are sequentially divided into a first row and a second row … … Nth row from top to bottom; wherein, the M-1 row of stator blades is the last row of stator blades of the M row of stator blades, the M row of stator blades is the next row of stator blades of the M-1 row of stator blades, (M is a positive integer, M is less than or equal to N).

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

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

In one embodiment, referring to FIG. 9, among the rows of stationary blades 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 to make the flow more uniform when the air flow passes through the row of stationary blades 32.

In one embodiment, referring to FIG. 9, among the rows of stationary blades 32: the plurality of stationary blades 33 in the at least one row of stationary blades 32 are unevenly disposed along the circumferential direction of the base 31 to facilitate machining.

In one embodiment, the housing 11 may be integrally formed with the hood 22 to ensure the strength of the connection of the rack to the hood 22. In one embodiment, the housing 11 is manufactured separately from the hood 22 to facilitate machining while at the same time facilitating accurate design of the air guide duct 27.

In one embodiment, as in the third embodiment, referring to fig. 10, two adjacent rows of stator blades 32: each stator vane 33a in the upper row of stator vanes 32a and each stator vane 33b in the lower row of stator vanes 32b are arranged at intervals along the axial direction of the base 31, so that the processing and the manufacturing are convenient.

In one embodiment, referring to FIG. 10, in two adjacent rows of stator vanes 32: the axial distance D between each stator vane 33a in the upper row of stator vanes 32a and each stator vane 33b in the lower row of stator vanes 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 plurality of pedestals 31, that is, the diffuser 30 includes a plurality of pedestals 31 respectively supporting each row of stator blades 32, and each row of stator blades 32 is mounted on a corresponding pedestal 31 for easy machining.

The air supply device 100 of the embodiment of the application can be applied to electrical appliances such as dust collectors, smoke exhaust ventilators, blowers, fans and the like.

Embodiments of the present application also disclose a dust collector, including the air supply device 100 according to any of the embodiments above. The dust collector of the embodiment of the application uses the air supply device 100, so that the airflow flowing loss is small, the power is high, the efficiency is high, and the noise is low.

The foregoing description of the preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, since it is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims (14)

1. Air supply arrangement, its characterized in that: the air inlet is formed in the middle of the end cover section, a diversion air channel is formed between the inner surface of the air cover and the radial outer side of the impeller, an annular air channel is formed in the front section of the casing, the annular air channel extends backwards from the diversion air channel, an annular air channel is formed between the rear section of the casing and the motor, and the annular air channel extends backwards from the annular air channel; along the axial direction of the casing: the sum of the length of the annular air duct and the length of the annular air duct is L, and the axial length of the cylindrical section is H, wherein L is more than or equal to 3H; the diameter of the air inlet is smaller than or equal to 20mm.

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

3. The air supply device according to claim 2, wherein: the annular air duct has the axial length W along the casing, and W is more than or equal to C.

4. A blowing device according to any one of claims 1 to 3, wherein: the motor is characterized in that a support is arranged in the shell, a plurality of positioning surfaces for supporting the motor in a matched and positioned mode are arranged on the support, and an annular air passage is formed between the part between the rear end face of the shell and the positioning surface and the motor.

5. The air moving device according to claim 4, wherein: the support comprises a plurality of ribs which are radially protruded from the inner surface of the shell, and the rear ends of at least two ribs are provided with the positioning surfaces.

6. The air moving device according to claim 5, wherein: and the ribs corresponding to the positioning surfaces are provided with lugs in a backward protruding mode, and the positioning surfaces are arranged on the corresponding lugs.

7. A blowing device according to any one of claims 1 to 3, wherein: the middle part of end cover section has the filter segment forward protrusion, the filter segment is annular, the filter segment encloses the air inlet.

8. A blowing device according to any one of claims 1 to 3, wherein: the diffuser is arranged in the shell and comprises a base arranged at the front section of the shell 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 shell and the base; and a flow passage for guiding airflow to flow is formed between two adjacent stator blades.

9. The air moving device according to claim 8, wherein: at least part of the stator blades are arranged in an axial direction inclined to the base.

10. The air moving device according to claim 8, wherein: the stator blades are sequentially arranged in a plurality of rows along the axial direction of the base, the number of the stator blades in each row of stator blades is a plurality of, and the stator blades in each row of stator blades are circumferentially arranged along the base.

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

12. The air moving device according to claim 10, wherein: the diffuser includes a plurality of pedestals that respectively support each row of the stationary blades, each row of the stationary blades being mounted on a corresponding one of the pedestals.

13. The air supply device according to claim 10, wherein, in adjacent two rows of the stator blades: the number of the stator blades in the next row of stator blades is larger than the number of the stator blades in the previous row of stator blades.

14. The dust collector is characterized in that: an air supply device comprising any one of claims 1-13.

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