EC fan with convenient adjustment

Abstract

The application relates to an EC fan convenient to adjust and match, belonging to the field of ventilation machinery, which comprises a motor, an impeller, a Venturi cylinder and a support assembly, the motor, the impeller and the Venturi cylinder are all installed on the support assembly, the impeller and the motor are rotationally connected, the impeller and the Venturi cylinder are coaxial, the support assembly comprises a base plate, a mounting frame and an adjusting plate, the motor is fixedly installed on the mounting frame, the mounting frame is connected with the base plate, the Venturi cylinder is installed on the adjusting plate, the support assembly further comprises an adjusting assembly, the adjusting assembly is used for controlling the movement or fixation of the adjusting plate relative to the base plate, and the movement direction of the adjusting plate relative to the base plate is parallel to the axial direction of the impeller. The application can adjust the axial position of the installed Venturi cylinder according to the position of the impeller by using the adjusting assembly, so that the axial matching precision of the Venturi cylinder and the impeller is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ventilation machinery, in particular to an EC fan with convenient adjustment and cooperation. BACKGROUND

[0002] The EC fan refers to a centrifugal fan using a digital brushless DC outer rotor motor or a centrifugal fan using an EC motor; the main structure thereof includes a motor, an impeller, a Venturi cylinder and a bracket, the motor is used to drive the impeller to rotate, the Venturi cylinder is located on the side away from the motor and coaxial with the impeller, and the bracket is used to mount various components.

[0003] In the related art, the impeller is connected with the output shaft of the motor, and the bracket is usually shaped by cold working process using pipe steel and round steel, and the bracket, the electrode and the Venturi cylinder are fixed by welding or bolt connection.

[0004] The above related technology has the following disadvantages: according to the working principle of the EC fan, the Venturi cylinder and the edge of the end of the impeller require a certain size of axial overlap, and the distance of the overlap is an important factor determining the performance of the EC fan; after the assembly of various components is completed, the axial relative position of the impeller and the Venturi cylinder is fixed, and it is difficult to adjust and correct the deviation of the cooperation of the impeller and the Venturi cylinder caused by objective factors such as machining error. SUMMARY

[0005] In order to improve the above problems, the present application provides an EC fan with convenient adjustment and cooperation.

[0006] The EC fan with convenient adjustment and cooperation provided by the present application adopts the following technical scheme:

[0007] An EC fan with convenient adjustment and cooperation, comprising a motor, an impeller, a Venturi cylinder and a bracket assembly, the motor, the impeller and the Venturi cylinder are all mounted on the bracket assembly, the impeller and the motor are rotationally connected, the impeller and the Venturi cylinder are coaxial, the bracket assembly comprises a seat plate, a mounting frame and an adjusting plate, the motor is fixedly mounted on the mounting frame, the mounting frame is connected with the seat plate, the Venturi cylinder is mounted on the adjusting plate, the bracket assembly further comprises an adjusting assembly, the adjusting assembly is used to control the movement or fixation of the adjusting plate relative to the seat plate, and the movement direction of the adjusting plate relative to the seat plate is parallel to the axial direction of the impeller.

[0008] By adopting the above technical scheme, during installation, the adjusting assembly is operated to adjust the adjusting plate according to the specific cooperation of the Venturi cylinder and the end of the impeller, so as to change the axial cooperation precision of the Venturi cylinder and the impeller.

[0009] Preferably, the adjusting assembly comprises a surrounding plate and a positioning bolt, the surrounding plate is fixedly connected with the base plate, a matching flap is fixedly connected on the adjusting plate, the plate surface of the matching flap is attached to the plate surface of the surrounding plate, a waist-shaped hole is formed on the surrounding plate, the length direction of the waist-shaped hole is parallel to the axial direction of the Venturi tube, and the positioning bolt passes through the waist-shaped hole and the matching flap and is threadedly connected with a nut.

[0010] By adopting the above technical scheme, the positioning bolt can be adjusted in the length range of the waist-shaped hole, thereby realizing the installation position adjustment of the adjusting plate carrying the Venturi tube along the length direction of the waist-shaped hole, and further realizing the axial relative position adjustment of the Venturi tube and the impeller during assembly.

[0011] Preferably, the surrounding plate is welded with the base plate, the mounting frame comprises a supporting leg, the side wall of the supporting leg is in contact with the plate surface of the surrounding plate, one end of the supporting leg is welded with the base plate, the edge of the surrounding plate and the end of the supporting leg are both fixedly connected with a positioning block, and the base plate is provided with a positioning hole or a positioning groove for inserting the positioning block.

[0012] By adopting the above technical scheme, the positioning hole or the positioning groove guides the position of the positioning block on the surrounding plate or the supporting leg, thereby improving the installation accuracy of the surrounding plate and the mounting frame relative to the base plate.

[0013] Preferably, the edge of the Venturi tube is coaxially integrally formed with a mounting extension plate, the plate surface of the mounting extension plate is perpendicular to the axial direction of the Venturi tube, a mounting hole is formed on the mounting extension plate, a fixing hole is formed on the adjusting plate, the diameter of the mounting hole is smaller than the diameter of the fixing hole, an installation bolt is arranged on the adjusting plate, the installation bolt passes through the mounting hole and the fixing hole and is threadedly connected with a nut.

[0014] By adopting the above technical scheme, since there is a radial size difference between the mounting hole and the fixing hole, during assembly, the adjusting plate and the matching flap have the condition of small position adjustment along the plate surface direction, thereby improving the coaxiality of the Venturi tube and the impeller during assembly.

[0015] Preferably, a shaft positioning assembly is detachably arranged on the adjusting plate at the fixing hole, the mounting hole and the fixing hole are arranged in more than four, and the mounting hole and the fixing hole are arranged in an annular array around the Venturi tube, during the mutual installation of the Venturi tube and the adjusting plate, the installation bolt and the shaft positioning assembly are alternatively arranged at the fixing hole.

[0016] Preferably, the shaft positioning assembly comprises a shaft positioning block and a lever, the shaft positioning block is located on the side of the adjusting plate away from the mounting extension plate and is fixed opposite to the adjusting plate, the lever is connected with the shaft positioning block and swings relative to the shaft positioning block, and the lever passes through the mounting hole.

[0017] By adopting the technical scheme, in the process of installing the Venturi cylinder and the adjusting plate, the operator swings the push rod to apply a pushing force to the installation extension plate, thereby controlling the lateral movement of the installation extension plate and the Venturi cylinder, changing the lateral position of the Venturi cylinder, and adjusting the coaxiality of the Venturi cylinder and the impeller.

[0018] Preferably, the fixed shaft block is embedded with an adjusting ball, the push rod passes through the adjusting ball and is coaxially connected with the adjusting ball, the end of the push rod is coaxially fixedly connected with a limiting ball, the limiting ball is elastic, the diameter of the limiting ball is greater than the hole diameter of the installation hole, and the limiting ball is located on the side of the installation extension plate away from the adjusting plate and abuts against the installation extension plate.

[0019] By adopting the technical scheme, the adjusting ball can be a ball joint structure for the free swinging of the push rod relative to the fixed shaft block, and the limiting ball can make the end sidewall of the push rod always effectively abut against the hole wall of the installation hole to apply a pushing force to the installation extension plate.

[0020] Preferably, a matching groove is formed on the side of the adjusting plate away from the installation extension plate, a matching protrusion is fixedly connected to the fixed shaft block, and the matching protrusion is inserted into the matching groove.

[0021] By adopting the technical scheme, the matching groove and the matching protrusion cooperate with each other to make the fixed shaft block have high position stability relative to the adjusting plate.

[0022] Preferably, a push rod ring is arranged on the side of the fixed shaft block away from the adjusting plate, the push rod ring is sleeved on the push rod, the push rod ring is magnetically attached to the fixed shaft block, and the inner diameter of the push rod ring is greater than the diameter of the push rod.

[0023] By adopting the technical scheme, when the push rod ring and the fixed shaft block are magnetically attached to each other, the two have a large friction force to make the push rod ring keep position stability, and the push rod can also keep a stable angle posture under the continuous pushing force of the push rod ring.

[0024] Preferably, a power-assisted wedge block is slidably arranged on the push rod ring, the sliding direction of the power-assisted wedge block is inclined relative to the axis of the push rod ring, a power-assisted ball is embedded on the side of the power-assisted wedge block facing the fixed shaft block, when the power-assisted wedge block moves close to the axis of the push rod ring, the power-assisted wedge block also moves close to the fixed shaft block, and the power-assisted ball abuts against the fixed shaft block.

[0025] By adopting the technical scheme, when the power-assisted wedge block moves close to the axis of the push rod ring, the power-assisted wedge block also has a tendency to move close to the fixed shaft block, at this time, the power-assisted ball abuts against the fixed shaft block, thereby the push rod ring can be pushed away from the fixed shaft block by a certain distance, and the operator can conveniently push the push rod ring.

[0026] In summary, the present application has at least one of the following beneficial technical effects:

[0027] 1. By adjusting the plate and the setting of the adjusting assembly, during the installation process, according to the specific matching of the end of the Venturi cylinder and the impeller, the adjusting assembly is operated to adjust the adjusting plate, so as to change the axial matching precision of the Venturi cylinder and the impeller;

[0028] 2. By the setting of the mounting hole and the fixing hole and the mounting bolt, due to the size gap between the mounting hole and the fixing hole, the adjusting amount of the extension plate relative to the adjusting plate in the parallel direction of the plate surface can be obtained, and the coincidence degree of the axis of the impeller and the axis of the Venturi cylinder can be adjusted, so as to further improve the matching precision of the two. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is the overall structure schematic diagram of the EC fan for embodying the convenient adjustment and matching in the embodiment one of the application.

[0030] Figure 2 It is the structure explosion schematic diagram of the support assembly in the embodiment one of the application.

[0031] Figure 3 It is the structure schematic diagram of the fixed shaft assembly in the embodiment two of the application.

[0032] Figure 4 It is the structure sectional view schematic diagram of the working principle of the fixed shaft assembly in the embodiment two of the application.

[0033] BRIEF DESCRIPTION OF DRAWINGS: 1, motor; 11, impeller; 12, Venturi cylinder; 121, extension plate; 122, mounting hole; 2, support assembly; 21, seat plate; 22, mounting frame; 221, supporting leg; 23, adjusting plate; 231, matching flap; 232, fixing hole; 233, matching groove; 234, mounting bolt; 24, positioning block; 25, positioning hole; 26, positioning groove; 3, adjusting assembly; 31, surrounding plate; 311, waist-shaped hole; 32, positioning bolt; 4, fixed shaft assembly; 41, fixed shaft block; 411, matching protruding block; 42, adjusting ball; 43, lever; 431, limiting ball; 44, push rod ring; 45, power wedge; 451, power ball bearing. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings Figures 1-4 The application will be further described in detail.

[0035] Embodiment one:

[0036] The embodiment of the application discloses an EC fan convenient for adjustment and matching, such as Figure 1As shown, the device includes a motor 1, an impeller 11, a venturi cylinder 12, and a support assembly 2. The support assembly 2 is used for directly or indirectly mounting the motor 1, impeller 11, and venturi cylinder 12. The impeller 11 is connected to the output shaft of the motor 1, and the motor 1 drives the impeller 11 to rotate. The venturi cylinder 12 is located on the side of the impeller 11 away from the motor 1.

[0037] like Figure 1 and 2 As shown, the support assembly 2 includes a base plate 21, a mounting bracket 22, and an adjusting plate 23. The motor 1 is mounted on the mounting bracket 22, and the venturi cylinder 12 is mounted on the adjusting plate 23. An adjusting assembly 3 is provided on the base plate 21, comprising a surrounding plate 31 and positioning bolts 32. The mounting bracket 22 and the surrounding plate 31 are located on the same side of the base plate 21 and are both fixedly connected to it. The adjusting plate 23 is mounted on the base plate 21 via the adjusting assembly 3, and the adjusting assembly 3 can be used to control the movement or fixation of the adjusting plate 23 relative to the base plate 21. The direction of movement of the adjusting plate 23 relative to the base plate 21 is parallel to the axial direction of the impeller 11. The adjusting plate 23 has a square shape, and a square through hole is provided at the center of the base plate 21, through which the adjusting plate 23 is located. The mounting bracket 22 includes four support legs 221 made of angle steel. Both the surrounding plate 31 and the support legs 221 are welded to the base plate 21. The edges of the surrounding plate 31 and the ends of the support legs 221 are integrally formed with positioning blocks 24. The surface of the base plate 21 is provided with positioning holes 25 for the positioning blocks 24 of the support legs 221 to be inserted. The walls of the square through holes of the base plate 21 are provided with positioning grooves 26 for the positioning blocks 24 of the surrounding plate 31 to be inserted. After each positioning block 24 is inserted into the positioning hole 25 or positioning groove 26, the surface of the surrounding plate 31 is perpendicular to the surface of the base plate 21, and the length direction of the support legs 221 is also perpendicular to the surface of the base plate 21. The cooperation of the positioning blocks 24, positioning holes 25, and positioning grooves 26 is used to improve the dimensional accuracy of the welding fit. There are four enclosure panels 31 in total, which form a square frame that corresponds to the outline of the square through hole on the base plate 21. The four support legs 221 are located at the four corner edges of this square frame, and the side walls of the support legs 221 are in contact with the surface of the enclosure panels 31.

[0038] like Figure 1 and 2As shown, the center of the adjusting plate 23 is provided with a circular through hole for the Venturi cylinder 12 to pass through, and the edge of the Venturi cylinder 12 is coaxially integrally formed with a mounting extension plate 121, the plate surface of the mounting extension plate 121 is perpendicular to the axial direction of the Venturi cylinder 12, six mounting holes 122 are formed on the mounting extension plate 121, and six fixing holes 232 are formed on the adjusting plate 23, each mounting hole 122 and fixing hole 232 are arranged in a ring array around the axis of the Venturi cylinder 12. A single fixing hole 232 corresponds to a mounting hole 122, the diameter of the mounting hole 122 is smaller than that of the fixing hole 232, a mounting bolt 234 is provided on the adjusting plate 23, the mounting bolt 234 passes through the mounting hole 122 and the fixing hole 232 and is threadedly connected with a nut. Due to the radial size deviation between the mounting hole 122 and the fixing hole 232, the adjusting plate 23 and the cooperating flange plate 231 have the condition of small position adjustment along the plate surface direction during assembly, thereby improving the coaxiality of the Venturi cylinder 12 and the impeller 11 during assembly.

[0039] As shown in Figure 1 and 2 As shown, the four edges of the adjusting plate 23 are all bent and formed with a cooperating flange plate 231, when the adjusting plate 23 is located in the square through hole on the seat plate 21, the plate surface of the cooperating flange plate 231 is attached to the plate surface of the enclosing plate 31. The enclosing plate 31 is provided with a waist-shaped hole 311, the length direction of the waist-shaped hole 311 is parallel to the axial direction of the Venturi cylinder 12, and the positioning bolt 32 passes through the waist-shaped hole 311 and the cooperating flange plate 231 and is threadedly connected with a nut. The positioning bolt 32 can be positionally adjusted within the length range of the waist-shaped hole 311, thereby realizing the installation position adjustment of the adjusting plate 23 carrying the Venturi cylinder 12 along the length direction of the waist-shaped hole 311, and further realizing the axial relative position adjustment of the Venturi cylinder 12 and the impeller 11 during assembly.

[0040] The implementation principle of the EC fan convenient to adjust and cooperate according to the embodiment of the application is as follows:

[0041] First, the enclosing plate 31 and the mounting bracket 22 are respectively welded on the seat plate 21, then the Venturi cylinder 12 is mounted on the adjusting plate 23 and the motor 1 is mounted on the mounting bracket 22, the installation positions of the adjusting plate 23 and the enclosing plate 31 are adjusted through the axial relative position adjustment of the impeller 11 and the Venturi cylinder 12, then the positioning bolt 32 is tightened, the installation positions of the mounting extension plate 121 and the adjusting plate 23 are adjusted through the coaxiality of the impeller 11 and the Venturi cylinder 12, then the mounting bolt 234 is tightened, and the EC fan is assembled.

[0042] Embodiment two:

[0043] As shown in Figure 3As shown, different from the embodiment one, in this embodiment, the adjusting plate 23 is detachably provided with the shaft fixing assembly 4 at the partial fixing holes 232, and the shaft fixing assembly 4 is used for facilitating the cooperation installation of the extension plate 121 and the adjusting plate 23. Both the fixing holes 232 and the installation holes 122 are six, in the installation process of the Venturi tube 12 and the adjusting plate 23, the shaft fixing assembly 4 is arranged at three fixing holes 232 of the adjusting plate 23, and one empty fixing hole 232 is arranged between every two shaft fixing assemblies 4, or the installation bolt 234 can be simultaneously passed through the empty fixing hole 232 and the installation hole 122, but the nut is not tightened.

[0044] As shown in Figure 3 and 4 , the shaft fixing assembly 4 comprises a shaft fixing block 41, a lever 43 and a push rod ring 44, the shaft fixing block 41 is annular, one end surface of the shaft fixing block 41 is integrally formed with a matching protrusion 411, the adjusting plate 23 is provided with a matching groove 233 on the side away from the extension plate 121, the matching protrusion 411 is inserted into the matching groove 233, and the shaft fixing block 41 is coaxial with the fixing hole 232. The shaft fixing block 41 is embedded with an adjusting ball 42, the adjusting ball 42 is provided with a threaded through hole, one end of the lever 43 is fixedly connected with a limiting ball 431 in a coaxial manner, and the limiting ball 431 is made of rubber and has an elastic deformation capacity. The diameter of the lever 43 is smaller than the space of the installation hole 122, the lever 43 is sequentially passed through the installation hole 122, the fixing hole 232 and the adjusting ball 42, the lever 43 is coaxially and threadedly connected with the adjusting ball 42, at this time, the adjusting ball 42 can be used as a ball joint structure for the lever 43 to freely swing relative to the shaft fixing block 41. The friction between the adjusting ball 42 and the shaft fixing block 41 is greater than the friction of the threaded pair between the lever 43 and the adjusting ball 42, and the diameter of the limiting ball 431 is greater than the hole diameter of the installation hole 122, that is, when the lever 43 is tightened on the adjusting ball 42, the limiting ball 431 abuts against the extension plate 121 so that the extension plate 121 abuts against the adjusting plate 23.

[0045] As shown in Figure 3 and 4As shown, the material of the fixed shaft block 41 is iron, the push rod ring 44 is made of magnet, the push rod ring 44 is adsorbed on the side of the fixed shaft block 41 away from the adjusting plate 23, the end of the push rod 43 away from the limiting ball 431 also penetrates the inner cavity of the push rod ring 44, and the inner diameter of the push rod ring 44 is greater than the diameter of the push rod 43. Artificially operating the push rod ring 44 to move in the direction perpendicular to the axial direction of the push rod ring 44, the push rod ring 44 abuts against the push rod 43 through the inner wall to make the push rod 43 swing, and the push rod 43 pushes the installation extension plate 121 to move, thereby realizing the change of the transverse position of the Venturi cylinder 12. The push rod ring 44 and the fixed shaft block 41 have strong magnetic attraction force, and the friction force between them is also large. In order to improve the convenience of pushing the push rod ring 44, the power wedge 45 is slidably arranged on the push rod ring 44, the sliding direction of the power wedge 45 relative to the push rod ring 44 is inclined relative to the axis of the push rod ring 44, and the side of the power wedge 45 facing the fixed shaft block 41 is embedded with the power ball 451. When the power wedge 45 moves close to the axis of the push rod ring 44, the power wedge 45 also has a tendency to move close to the fixed shaft block 41, and at this time, the power ball 451 abuts against the fixed shaft block 41, thereby pushing the push rod ring 44 away from the fixed shaft block 41 by 1-2 mm. The power wedge 45 is provided with two power wedges 45 and is symmetrically arranged on the opposite sides of the axis of the push rod ring 44. In the process of operating the push rod ring 44 to push the push rod 43 to swing, the push rod 43 can be regarded as a lever, and the adjusting ball 42 is the fulcrum. Because the friction force between the push rod ring 44 and the fixed shaft block 41 is large, even if the installation hole 122 of the installation extension plate 121 is decentered with the fixed hole 232 after being pushed, the axis of the push rod 43 is angularly offset from the axis of the fixed hole 232, the limiting ball 431 is deformed, and the reaction force of the installation extension plate 121 on the push rod 43 cannot overcome the friction force between the push rod ring 44 and the fixed shaft block 41, that is, the push rod 43 only swings under the pushing of the push rod ring 44.

[0046] During installation, three fixed holes 232 are arranged with the fixed shaft assembly 4, and the other three fixed holes 232 are penetrated by the installation bolts 234. Then, the operator operates the fixed shaft assembly 4 while measuring the coaxiality of the Venturi cylinder 12 relative to the impeller 11 in real time. When the debugging is completed, the nuts on the three installation bolts 234 are immediately tightened, then the fixed shaft assembly 4 is removed, and the installation bolts 234 and nuts are tightened in the remaining three fixed holes 232, thereby completing the installation of the Venturi cylinder 12 relative to the adjusting plate 23.

[0047] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application. Therefore, equivalent changes made on the basis of the structure, shape, and principle of the present application should be covered by the protection scope of the present application.

Claims

1. An EC fan that is easy to adjust and coordinate, comprising a motor (1), an impeller (11), a venturi cylinder (12), and a support assembly (2), wherein the motor (1), impeller (11), and venturi cylinder (12) are all mounted on the support assembly (2), the impeller (11) and the motor (1) are rotatably connected, and the impeller (11) and the venturi cylinder (12) are coaxial, characterized in that: The bracket assembly (2) comprises a seat plate (21), a mounting frame (22) and an adjusting plate (23), the motor (1) is fixedly installed on the mounting frame (22), the mounting frame (22) is connected with the seat plate (21), the Venturi cylinder (12) is installed on the adjusting plate (23), the bracket assembly (2) further comprises an adjusting assembly (3), the adjusting assembly (3) is used for controlling the movement or fixation of the adjusting plate (23) relative to the seat plate (21), and the movement direction of the adjusting plate (23) relative to the seat plate (21) is parallel to the axial direction of the impeller (11); The edge of the Venturi cylinder (12) is coaxially and integrally formed with a mounting extension plate (121), the plate surface of the mounting extension plate (121) is perpendicular to the axial direction of the Venturi cylinder (12), the mounting extension plate (121) is provided with mounting holes (122), the adjusting plate (23) is provided with fixing holes (232), the hole diameter of the mounting holes (122) is smaller than the hole diameter of the fixing holes (232), the adjusting plate (23) is provided with mounting bolts (234), the mounting bolts (234) pass through the mounting holes (122) and the fixing holes (232) and are threadedly connected with nuts; The adjusting plate (23) is detachably provided with an axis fixing assembly (4) at the fixing holes (232), the mounting holes (122) and the fixing holes (232) are all provided with four or more than four, the mounting holes (122) and the fixing holes (232) are arranged in an annular array around the Venturi cylinder (12), during the mutual installation of the Venturi cylinder (12) and the adjusting plate (23), the mounting bolts (234) and the axis fixing assembly (4) are alternatively arranged at the fixing holes (232), The axis fixing assembly (4) comprises an axis fixing block (41) and a lever (43), the axis fixing block (41) is located on the side of the adjusting plate (23) away from the mounting extension plate (121) and is fixed relative to the adjusting plate (23), the lever (43) is connected with the axis fixing block (41) and swings relative to the axis fixing block (41), and the lever (43) passes through the mounting holes (122); The axis fixing block (41) is embedded with an adjusting ball (42), the lever (43) passes through the adjusting ball (42) and is coaxially and threadedly connected with the adjusting ball (42), the end of the lever (43) is coaxially and fixedly connected with a limiting ball (431), the limiting ball (431) is elastic, the diameter of the limiting ball (431) is greater than the hole diameter of the mounting holes (122), and the limiting ball (431) is located on the side of the mounting extension plate (121) away from the adjusting plate (23) and abuts against the mounting extension plate (121).

2. An EC fan with easy adjustment of fit according to claim 1, characterized in that: The adjusting assembly (3) comprises a surrounding plate (31) and a positioning bolt (32), the surrounding plate (31) is fixedly connected with the seat plate (21), the adjusting plate (23) is fixedly connected with a matched turning plate (231), the plate surface of the matched turning plate (231) is attached to the plate surface of the surrounding plate (31), the surrounding plate (31) is provided with a waist-shaped hole (311), the length direction of the waist-shaped hole (311) is parallel to the axial direction of the Venturi cylinder (12), and the positioning bolt (32) passes through the waist-shaped hole (311) and the matched turning plate (231) and is screw-connected with a nut.

3. An EC fan with easy adjustment of fit according to claim 2, characterized in that: The surrounding plate (31) is welded with the seat plate (21), the mounting frame (22) comprises a supporting leg (221), the side wall of the supporting leg (221) is in contact with the plate surface of the surrounding plate (31), one end of the supporting leg (221) is welded with the seat plate (21), the edge of the surrounding plate (31) and the end of the supporting leg (221) are fixedly connected with a positioning block (24), and the seat plate (21) is provided with a positioning hole (25) or a positioning groove (26) for inserting the positioning block (24).

4. An EC fan with easy adjustment of fit according to claim 2, characterized in that: The adjusting plate (23) is provided with a matched groove (233) on the side away from the mounting extension plate (121), the positioning shaft block (41) is fixedly connected with a matched protruding block (411), and the matched protruding block (411) is inserted into the matched groove (233).

5. An EC fan with easy adjustment of fit according to claim 2, characterized in that: The positioning shaft block (41) is provided with a push rod ring (44) on the side away from the adjusting plate (23), the push rod ring (44) is sleeved outside the push rod (43), the push rod ring (44) is attached to the positioning shaft block (41) through magnetic attraction, and the inner diameter of the push rod ring (44) is larger than the diameter of the push rod (43).

6. An EC fan with easy adjustment of fit according to claim 5, characterized in that: The push rod ring (44) is slidably provided with a power-assisted wedge block (45), the sliding direction of the power-assisted wedge block (45) relative to the push rod ring (44) is inclined relative to the axis of the push rod ring (44), the side of the power-assisted wedge block (45) facing the positioning shaft block (41) is embedded with a power-assisted ball (451), when the power-assisted wedge block (45) moves close to the axis of the push rod ring (44), the power-assisted wedge block (45) also moves close to the positioning shaft block (41), and the power-assisted ball (451) is in abutting contact with the positioning shaft block (41).

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